JP4069455B2 - Battery charge state control device - Google Patents

Description

  The present invention relates to an assembled battery charge state control device that controls the state of charge of an assembled battery.

  Conventionally, there is a cell variation adjusting device disclosed in Japanese Patent Application Laid-Open No. 2002-325370 as an assembled battery charge state control device that controls the state of charge of the assembled battery. The cell variation adjusting device is a device that is provided for each cell group that constitutes the assembled battery and equalizes the charge states of a plurality of unit cells that constitute the cell group. The cell variation adjusting device includes a voltage dividing circuit, a comparison circuit, a logic circuit, and a discharge circuit.

The voltage dividing circuit is connected to a plurality of unit cells constituting the cell group. The voltage dividing circuit equally divides the group voltage of the cell group according to the number of unit cells, and outputs a reference voltage that is a control target of the cell voltage of the unit cell. The reference voltage output from the voltage dividing circuit is input to the comparison circuit. The comparison circuit compares the reference voltage output from the voltage dividing circuit with the cell voltage of the corresponding unit cell, and outputs a signal corresponding to the comparison result. The signal output from the comparison circuit is input to the logic circuit. The logic circuit determines whether discharge is possible for each unit cell based on the signal output from the comparison circuit. The output of the logic circuit is input to the discharge circuit. The discharge circuit short-circuits the corresponding cell based on the output of the logic circuit to discharge it, and controls the cell voltage of the unit cell to the reference voltage output from the voltage dividing circuit.
JP 2002-325370 A

  When a disconnection occurs between a plurality of unit cells constituting a cell group and the cell variation adjusting device, the voltage dividing circuit may not be able to output a reference voltage based on the group voltage of the cell group. In addition, the comparison circuit cannot compare the reference voltage with the cell voltage of the unit cell. As a result, the cell variation adjusting device cannot control the charge state of a plurality of unit cells based on the group voltage of the cell group and the cell voltage of the unit cell. For this reason, it is necessary to reliably detect disconnection between the unit cell and the cell variation adjusting device. However, the above-described cell variation adjusting device cannot detect disconnection between the unit cell and the cell variation adjusting device.

  The present invention has been made in view of such circumstances, and is a set capable of detecting a disconnection between a cell constituting the assembled battery and the assembled battery charge state control device for controlling the charged state of the cell. An object of the present invention is to provide a battery charge state control device.

  Therefore, as a result of intensive research and trial and error to solve this problem, the present inventor changed the input impedance of the short circuit connected to the adjacent cell to a different value from the operating state of the short circuit, In addition, by setting the combined input impedance of the short circuit and the abnormality detection circuit to different values, from the abnormality detection state of the abnormality detection circuit, from the operating state of the short circuit after temporarily short-circuiting the cell with the short circuit, The present inventors have come up with the idea that a disconnection between a cell and a short circuit, a short circuit, and an abnormality detection circuit can be detected.

That is, the assembled battery charge state control device according to claim 1 is provided with a short circuit that is connected to a plurality of cells connected in series constituting the assembled battery and shorts the cell based on the voltage of the cell. In the state-of-charge control device, the short circuit is different in input impedance before a short circuit between input terminals connected to the cells for each adjacent cell, and further connected to the adjacent cells and the adjacent cells. When a disconnection occurs between the short circuit and the entire voltage of the adjacent cells is divided by the input impedance of the short circuit connected, between the input terminals of the short circuit connected The voltage of a magnitude different from that before the disconnection is applied, the short circuit state of the connected short circuit is changed, the short circuit state is changed, and the connected short circuit And the voltage is further changed to be applied between the power terminals, a short-circuit state of the connected had the short circuit further changes, since, a state change is repeated, based on the operating state of the short circuit in the state It has a disconnection detection circuit which detects a disconnection between the cell and the short circuit.

  The assembled battery charge state control device according to claim 2 is the assembled battery charge state control device according to claim 1, wherein the short circuit has a resistance having a different resistance value for each of the adjacent cells. It is characterized by having between input terminals to which cells are connected.

  The assembled battery charge state control device according to claim 3 is the assembled battery charge state control device according to claim 1, wherein the short circuit further includes the cell when the voltage of the cell becomes larger than a short circuit voltage threshold. When the short circuit alternately and repeatedly shorts adjacent cells, the disconnection detection circuit determines that a disconnection has occurred between the connection points between the adjacent cells and the short circuit. It is characterized by doing.

The assembled battery charge state control device according to claim 4 configures the assembled battery, and a short circuit that is connected to a plurality of cells connected in series constituting the assembled battery and shorts the cell based on the voltage of the cell. In an assembled battery charge state control device comprising an abnormality detection circuit connected to a plurality of cells connected in series and detecting an abnormality of the cell based on the voltage of the cell, the short circuit and the abnormality detection circuit are adjacent to each other The combined input impedance before a short circuit between input terminals to which the cells are connected differs for each of the cells, and the adjacent cells, the short circuit and the abnormality detection circuit connected to the adjacent cells, When a disconnection occurs, all the voltages of the adjacent cells are divided and connected by the combined input impedance of the short circuit and the abnormality detection circuit that are connected. By applying a voltage of a magnitude different from that before disconnection between the input terminals of the short circuit and the abnormality detection circuit, the short circuit state of the connected short circuit was changed, and the short circuit state was changed, The voltage applied between the connected short circuit and the input terminal of the abnormality detection circuit is further changed, the short circuit state of the connected short circuit is further changed, and thereafter, the change is repeated. And a disconnection detection circuit for detecting a disconnection between the cell, the short circuit, and the abnormality detection circuit based on an output of the abnormality detection circuit in the state .

  The assembled battery charge state control device according to claim 5 is the assembled battery charge state control device according to claim 4, wherein the short circuit has a resistance having a different resistance value for each of the adjacent cells. It is characterized by having between input terminals connected to a cell.

  The assembled battery charge state control device according to claim 6 is the assembled battery charge state control device according to claim 4, and further, the abnormality detection circuit has a resistance having a different resistance value for each of the adjacent cells. It is characterized by having between input terminals to which the cells are connected.

  The assembled battery charge state control device according to claim 7 is the assembled battery charge state control device according to any one of claims 4 to 6, wherein the short circuit further includes the cell when the voltage of the cell exceeds a short circuit voltage threshold. The abnormality detection circuit detects the overcharge state of the cell by comparing the voltage of the cell with an overcharge voltage threshold, and the disconnection detection circuit detects the overcharge of the cell. When the state is repeatedly detected, it is determined that a disconnection has occurred between the cell, the short circuit, and the abnormality detection circuit.

  The assembled battery charge state control device according to claim 8 is the assembled battery charge state control device according to any one of claims 4 to 6, wherein the short circuit further includes the cell when the voltage of the cell exceeds a short circuit voltage threshold. The abnormality detection circuit detects the overdischarge state of the cell by comparing the voltage of the cell with an overdischarge voltage threshold, and the disconnection detection circuit detects that the abnormality detection circuit is overdischarged of the cell. When the state is repeatedly detected, it is determined that a disconnection has occurred between the cell, the short circuit, and the abnormality detection circuit.

  The assembled battery charge state control device according to claim 9 is the assembled battery charge state control device according to any one of claims 4 to 6, wherein the short circuit further includes the cell when the voltage of the cell becomes larger than a short circuit voltage threshold. The abnormality detection circuit detects an overcharge state and an overdischarge state of the cell by comparing the voltage of the cell with an overcharge voltage threshold value and an overdischarge voltage threshold value. When the abnormality detection circuit connected to the cell repeatedly detects the overcharge state and the overdischarge state alternately, between the connection point between the adjacent cells and the short circuit and the abnormality detection circuit. It is determined that a disconnection has occurred.

The assembled battery charge state control device according to claim 10, wherein the assembled battery charge state control device includes a short circuit that is connected to a plurality of cells connected in series constituting the assembled battery and short-circuits the cells based on the voltage of the cells. In the control device, when one of the adjacent cells is further short-circuited by the short-circuit, and the disconnection occurs between the adjacent cell and the short-circuit connected to the adjacent cell, the adjacent cell Is divided by the input impedance of the connected short circuit, and one of the adjacent cells is short-circuited, so that the input terminal of the connected short circuit has a magnitude different from that before the short circuit. The voltage applied between the input terminals of the connected short circuit is changed by changing the short circuit state of the connected short circuit and changing the short circuit state. Changed to al, a short-circuit state of the short circuit has been connected further changes, since, in a state in which the change is repeated, in the state, and the cell based on the operating state of the short circuit after the short It has a disconnection detection circuit which detects disconnection between the short circuit.

  The assembled battery charge state control device according to claim 11 is the assembled battery charge state control device according to claim 10, and further, the disconnection detection circuit includes a plurality of the cells in the short circuit, respectively. It is short-circuited.

  The assembled battery charge state control device according to claim 12 is the assembled battery charge state control device according to claim 11, wherein the disconnection detection circuit sequentially short-circuits the plurality of cells with the short circuit. Features.

  The assembled battery charge state control device according to claim 13 is the assembled battery charge state control device according to claim 11, wherein the disconnection detection circuit simultaneously short-circuits the plurality of cells with the short circuit. Features.

  The assembled battery charge state control device according to claim 14 is the assembled battery charge state control device according to any one of claims 11 to 13, wherein the short circuit further includes the cell when the voltage of the cell exceeds a short circuit voltage threshold. When the short circuit connected to the adjacent cell repeatedly shorts the adjacent cell alternately, the disconnection detection circuit is disconnected between the connection point between the adjacent cells and the short circuit. It is characterized in that it is determined that occurrence has occurred.

  The assembled battery charge state control device according to claim 15 is the assembled battery charge state control device according to claims 1 to 14, further controlling the charge state of the assembled battery mounted on the vehicle. .

  According to the assembled battery charge state control device of the first aspect, it is possible to detect a disconnection generated between the cell and the short circuit from the operating state of the short circuit. Therefore, the reliability of the assembled battery charge state control device can be improved.

  When a disconnection occurs between an adjacent cell and a short circuit connected to these cells, the total voltage of the adjacent cell is divided by the input impedance between the input terminals of the short circuit connected to these cells. Is done. Before the short circuit of the short circuit, the input impedance between the input terminals of the short circuit connected to the adjacent cells is set to a different value. For this reason, a voltage having a magnitude different from the voltage of the cell applied before the disconnection is applied between the input terminals of the short circuit connected to the adjacent cells. The short circuit is short-circuited based on a voltage having a magnitude different from the voltage of the cell applied between the input terminals.

  By the way, when the short circuit is short-circuited, the input impedance between the input terminals changes, and accordingly, the voltage applied between the input terminals also changes. A short circuit changes a short circuit state based on the voltage applied between the input terminals which changed further by short-circuiting. Therefore, it is possible to detect a disconnection that occurs between the cell and the short circuit based on the operating state of the short circuit.

  According to the assembled battery charge state control device of the second aspect, the input impedance between the input terminals of the short circuit connected to the adjacent cells can be reliably set to different values.

  According to the assembled battery charge state control device according to claim 3, the occurrence of the disconnection between the cell and the short circuit is caused by the short circuit connected to the adjacent cell repeatedly shorting the adjacent cell alternately. Can be specified. Therefore, the reliability of the assembled battery charge state control device can be further improved.

  When a disconnection occurs between the connection points between adjacent cells and the short circuit connected to these cells, the total voltage of the adjacent cells is input between the input terminals of the short circuit connected to these cells. Divided by impedance. Before the short circuit of the short circuit, the input impedance between the input terminals of the short circuit connected to the adjacent cells is set to a different value. Therefore, a voltage larger than the short circuit voltage threshold is applied between the input terminals of the short circuit connected to one cell. In addition, a voltage smaller than the short-circuit voltage threshold is applied between the input terminals of the short circuit connected to the other cell.

  By applying a voltage higher than the short-circuit voltage threshold, the short circuit short-circuits between the input terminals corresponding to one cell. By short-circuiting between the input terminals corresponding to one cell, the input impedance between the input terminals decreases. A voltage smaller than the short-circuit voltage threshold is applied between the input terminals of the short circuit connected to one cell. Further, a voltage larger than the short-circuit voltage threshold is applied between the input terminals of the short-circuit circuit connected to the other cell.

  When the applied voltage changes from a voltage greater than the short-circuit voltage threshold to a smaller voltage, the short circuit opens the input terminals corresponding to one cell. Furthermore, the short circuit between the input terminals corresponding to the other cell is short-circuited by changing the applied voltage from a voltage smaller than the short-circuit voltage threshold value to a larger voltage. Thereafter, the short circuit alternately and repeatedly shorts between the input terminals of the short circuit connected to the adjacent cells. For this reason, the short-circuit circuit alternately and repeatedly short-circuits the adjacent cells, so that a disconnection occurring between the connection point between the adjacent cells and the short-circuit can be identified and detected.

  According to the assembled battery charge state control device of the fourth aspect, the disconnection that occurs between the cell, the short circuit, and the abnormality detection circuit can be detected from the abnormality detection state of the abnormality detection circuit. Therefore, the reliability of the assembled battery charge state detection device can be improved.

  When a disconnection occurs between an adjacent cell and a short circuit and abnormality detection circuit connected to these cells, the entire voltage of the adjacent cell is input to the short circuit and abnormality detection circuit connected to these cells. Divided by the combined input impedance between terminals. Before the short circuit of the short circuit, the combined input impedances between the input terminals of the short circuit and the abnormality detection circuit connected to the adjacent cells are set to different values. Therefore, a voltage having a magnitude different from the voltage of the cell applied before the disconnection is applied between the input terminals of the short circuit and the abnormality detection circuit connected to the adjacent cells. The short circuit is short-circuited based on a voltage having a magnitude different from the voltage of the cell applied between the input terminals.

  By the way, when the short circuit is short-circuited, the input impedance between the input terminals changes, and accordingly, the voltage applied between the input terminals also changes. Therefore, based on the voltage between input terminals, the disconnection which generate | occur | produced between the cell and the short circuit can be detected as a cell abnormality.

  According to the assembled battery charge state control apparatus of the fifth aspect, the input impedance of the short circuit connected to the adjacent cell can be reliably set to a different value.

  According to the assembled battery charge state control device of the sixth aspect, the input impedance of the abnormality detection circuit connected to the adjacent cell can be reliably set to a different value.

  According to the assembled battery charge state control device of the seventh aspect, it is possible to detect a disconnection that occurs between the cell, the short circuit, and the abnormality detection circuit as an overcharge state of the cell. Therefore, the reliability of the assembled battery charge state detection device can be reliably improved.

  When a disconnection occurs between the connection point between adjacent cells and the short circuit and abnormality detection circuit connected to these cells, the entire voltage of the adjacent cell is changed to the short circuit and abnormality connected to these cells. The voltage is divided by the combined input impedance between the input terminals of the detection circuit. Before the short circuit of the short circuit, the combined input impedance between the short circuit connected to the adjacent cell and the input terminal for abnormality detection is set to a different value. Therefore, a voltage larger than the short circuit voltage threshold is applied between the input terminals of the short circuit connected to one cell. In addition, a voltage smaller than the short-circuit voltage threshold is applied between the input terminals of the short circuit connected to the other cell.

  By applying a voltage higher than the short-circuit voltage threshold, the short circuit short-circuits between the input terminals corresponding to one cell. By short-circuiting between the input terminals corresponding to one cell, the combined input impedance between the input terminals is lowered. A voltage smaller than the short-circuit voltage threshold is applied between the input terminals of the short circuit connected to one cell. Further, a voltage larger than the short-circuit voltage threshold is applied between the input terminals of the short-circuit circuit connected to the other cell.

  When the applied voltage changes from a voltage greater than the short-circuit voltage threshold to a smaller voltage, the short circuit opens the input terminals corresponding to one cell. Furthermore, the short circuit between the input terminals corresponding to the other cell is short-circuited by changing the applied voltage from a voltage smaller than the short-circuit voltage threshold value to a larger voltage. Thereafter, the voltage between the input terminals changes repeatedly and greatly by alternately short-circuiting the input terminals of the short-circuit connected to the adjacent cells. Therefore, the abnormality detection circuit can detect the disconnection that occurs between the cell, the short circuit, and the abnormality detection circuit by comparing the voltage between the input terminals with the overcharge voltage threshold and repeatedly detecting the overcharge state. it can.

  According to the assembled battery charge state control device of the eighth aspect, the disconnection that occurs between the cell, the short circuit, and the abnormality detection circuit can be detected as the overdischarge state of the cell. Therefore, the reliability of the assembled battery charge state detection device can be reliably improved.

  As described above, when the short-circuit is repeatedly short-circuited between the input terminals of the short-circuit connected to the adjacent cells, the voltage between the input terminals is repeatedly and greatly changed. Therefore, the abnormality detection circuit can detect the disconnection that occurs between the cell, the short circuit, and the abnormality detection circuit by comparing the voltage between the input terminals with the overdischarge voltage threshold and repeatedly detecting the overdischarge state. it can.

  According to the assembled battery charge state control device according to claim 9, the disconnection between the connection point between the adjacent cells, the short circuit and the abnormality detection circuit is determined based on the occurrence state of the overcharge state and the over discharge state of the cell. The location of occurrence can be identified. Therefore, the reliability of the assembled battery charge state detection device can be further improved.

  As described above, when the short-circuit is repeatedly short-circuited between the input terminals of the short-circuit connected to the adjacent cells, the voltage between the input terminals is repeatedly and greatly changed. Therefore, the abnormality detection circuit compares the voltage between the input terminals with the overcharge voltage threshold value and the overdischarge voltage threshold value, and alternately and repeatedly detects the overcharge state and the overdischarge state. A disconnection occurring between the detection circuit and the detection circuit can be detected by specifying the disconnection location.

  According to the assembled battery charge state control device of the tenth aspect, it is possible to detect the disconnection generated between the cell and the short circuit from the operating state of the short circuit. Therefore, the reliability of the assembled battery charge state control device can be improved.

  When a disconnection occurs between an adjacent cell and a short circuit connected to these cells, the total voltage of the adjacent cell is divided by the input impedance between the input terminals of the short circuit connected to these cells. Is done.

  By the way, when the short circuit is short-circuited, the input impedance between the input terminals changes, and accordingly, the voltage applied between the input terminals also changes. Therefore, a voltage having a magnitude different from that of the cell applied before the short circuit is applied between the input terminals of the short circuit connected to the adjacent cells. A short circuit changes a short circuit state based on the voltage of the magnitude | size different from the voltage of the cell applied between input terminals. Therefore, it is possible to detect a disconnection that occurs between the cell and the short circuit based on the operating state of the short circuit.

  According to the assembled battery charge state control device of the eleventh aspect, it is possible to shorten the detection time of the disconnection generated between the cell and the short circuit.

  According to the assembled battery charge state control apparatus of the twelfth aspect, it is possible to reliably detect the disconnection that occurs between the cell and the short circuit.

  According to the assembled battery charge state control device of the thirteenth aspect, it is possible to further reduce the detection time of the disconnection generated between the cell and the short circuit.

  According to the assembled battery charge state control device according to claim 14, the short circuit connected to the adjacent cell alternately short-circuits the adjacent cell, whereby the occurrence location of the disconnection between the cell and the short circuit is determined. Can be identified. Therefore, the reliability of the assembled battery charge state control device can be further improved.

  When a disconnection occurs between the connection points between adjacent cells and the short circuit connected to these cells, the total voltage of the adjacent cells is input between the input terminals of the short circuit connected to these cells. Divided by impedance.

  By the way, when the short circuit is short-circuited, the input impedance between the input terminals is lowered. Therefore, when a short circuit connected to an adjacent cell short-circuits one cell, a voltage smaller than the short-circuit voltage threshold is applied between the input terminals of the short circuit connected to one cell. Further, a voltage larger than the short-circuit voltage threshold is applied between the input terminals of the short-circuit circuit connected to the other cell.

  When a voltage larger than the short circuit voltage threshold is applied, the short circuit short-circuits between the input terminals corresponding to the other cell. By short-circuiting between the input terminals corresponding to the other cell, the input impedance between the input terminals decreases. A voltage smaller than the short circuit voltage threshold is applied between the input terminals of the short circuit connected to the other cell. In addition, a voltage larger than the short-circuit voltage threshold is applied between the input terminals of the short circuit connected to one cell.

  When the applied voltage changes from a voltage greater than the short-circuit voltage threshold value to a smaller voltage, the short circuit opens the input terminals corresponding to the other cell. Furthermore, when the applied voltage changes from a voltage smaller than the short circuit voltage threshold value to a larger voltage, the short circuit short-circuits between the input terminals corresponding to one cell. Thereafter, the short circuit alternately and repeatedly shorts between the input terminals of the short circuit connected to the adjacent cells. For this reason, the short-circuit circuit alternately and repeatedly short-circuits the adjacent cells, so that a disconnection occurring between the connection point between the adjacent cells and the short-circuit can be identified and detected.

  According to the assembled battery charge state control device according to claim 15, in the vehicle, a disconnection between a cell constituting the assembled battery and the assembled battery charge state control device that controls the charge state of the cell can be detected. it can. Therefore, the reliability of the assembled battery charge state control device mounted on the vehicle can be improved.

  In this embodiment, the assembled battery charge state control device according to the present invention is applied to an assembled battery system that has an assembled battery that supplies power to a drive motor of a hybrid electric vehicle and outputs data related to the state of the assembled battery. An example is shown.

(First embodiment)
The block diagram of the assembled battery system in 1st Embodiment is shown in FIG. 1, and the circuit diagram of a charge condition control apparatus is shown in FIG. Then, with reference to FIG. 1 and FIG. 2, a specific description will be given in the order of configuration, operation, and effect.

  First, the configuration of the assembled battery system will be described. As shown in FIG. 1, the assembled battery system 1 includes an assembled battery 10, charge state control devices CEU <b> 1 to CEUn (assembled battery charge state control device), a current sensor 11, and an assembled battery controller 12. . A hybrid electric vehicle controller 2 (hereinafter referred to as HEV controller) is connected to the assembled battery controller 12. Furthermore, a motor 4 is connected to the HEV controller 2 via an inverter 3.

  The assembled battery 10 is, for example, a direct current power source configured by connecting n sets of cell groups CG1 to CGn including six chargeable / dischargeable cells in series. The positive electrode terminal and the negative electrode terminal of the assembled battery 10 are each connected to the inverter 3.

  The charge state control devices CEU1 to CEUn are devices that are provided for the corresponding cell groups CG1 to CGn, respectively, and control the charge states of the individual cells constituting the cell groups CG1 to CGn. The input terminals of the charge state control devices CEU1 to CEUn are connected to the positive and negative terminals of the individual cells constituting the corresponding cell groups CG1 to CGn, and the output terminals are connected to the assembled battery controller 12, respectively.

  The current sensor 11 is a sensor that detects a current flowing through the assembled battery 10. The current sensor 11 is disposed between the negative terminal of the assembled battery 10 and the inverter 3, and the output terminal of the current sensor 11 is connected to the assembled battery controller 12.

  The assembled battery controller 12 is a device that outputs data related to the state of the assembled battery 10 based on the voltages of the cell groups CG1 to CGn, the outputs of the charge state control devices CEU1 to CEUn, and the current flowing through the assembled battery 10. Input terminals of the battery pack controller 12 are connected to the positive and negative terminals of the cell groups CG1 to CGn, the output terminals of the charge state control devices CEU1 to CEUn, and the output terminal of the current sensor 11, respectively. The output terminal is connected to the HEV controller 2.

  Next, a specific configuration of the charge state control devices CEU1 to CEUn will be described in detail. Since the charge state control devices CEU1 to CUn have the same configuration, only the charge state control device CEU1 will be described here.

  As shown in FIG. 2, the charge state control device CEU1 includes cell short circuits S11 to S16 (short circuit) and a microcomputer CPU 10 (disconnection detection circuit). The charge state control device CEU1 is connected to a cell group CG1 including six cells C11 to C16 connected in series.

  The cell short circuits S11 to S16 are circuits that are connected to the corresponding cells C11 to C16, respectively, and discharge the cells C11 to C16 by short-circuiting when the voltage of the cells C11 to C16 is greater than the short-circuit voltage threshold.

  The cell short circuit S11 includes a cell voltage voltage dividing circuit 110, a short circuit determination reference voltage circuit 111, a comparator CP11, a transistor TR11, and a short circuit resistor R11, and is connected to the cell C11.

  The cell voltage dividing circuit 110 is a circuit that divides and outputs the voltage of the cell C11. The cell voltage dividing circuit 110 includes resistors 110a and 110b. The resistor 110a and the resistor 110b are connected in series. One end of the resistor 110a is connected to the positive terminal of the cell C11, and one end of the resistor 110b is connected to the negative terminal of the cell C11.

  The short-circuit determination reference voltage circuit 111 is a circuit that outputs a reference voltage corresponding to a short-circuit voltage threshold for determining whether or not a short circuit can be performed in the cell C11. The short circuit determination reference voltage circuit 111 includes a resistor 111a and a short circuit determination reference power supply 111b. One end of the resistor 111a is connected to the positive terminal of the cell C11, the other end is connected to the positive terminal of the short-circuit determination reference power supply 111b, and the negative terminal of the short-circuit determination reference power supply 111b is connected to the negative terminal of the cell C11.

  The comparator CP <b> 11 is an element that compares the voltage of the cell C <b> 11 divided by the cell voltage dividing circuit 110 with the reference voltage output from the short-circuit determination reference voltage circuit 111. The comparator CP11 outputs a high level when the divided voltage of the cell C11 is higher than a reference voltage corresponding to the short-circuit voltage threshold. The non-inverting input terminal of the comparator CP11 is connected to the connection point between the resistor 110a and the resistor 110b, and the inverting input terminal is connected to the connection point between the resistor 111a and the short-circuit determination reference power supply 111b. The output terminal is connected to the transistor TR11 and the microcomputer CPU10.

  The transistor TR11 is a switching element for short-circuiting the cell C11. The short-circuit resistor R11 is an element for limiting a short-circuit current flowing through the cell C11 when the transistor TR11 short-circuits the cell C11. The base of the transistor TR11 is connected to the output terminal of the comparator CP11, the collector is connected to the positive terminal of the cell C11 via the short-circuit resistor R11, and the emitter is connected to the negative terminal of the cell C11.

  A cell short circuit S12 is connected to the cell C12 adjacent to the cell C11. The cell short circuit S12 includes a cell voltage dividing circuit 120, a short circuit determination reference voltage circuit 121, a comparator CP12, a transistor TR12, and a short circuit resistor R12.

  The cell voltage dividing circuit 120 is a circuit that divides and outputs the voltage of the cell C12. The cell voltage dividing circuit 120 includes resistors 120a and 120b. The resistor 120a and the resistor 120b are connected in series. One end of the resistor 120a is connected to the positive terminal of the cell C12, and one end of the resistor 120b is connected to the negative terminal of the cell C12.

  The short-circuit determination reference voltage circuit 121 is a circuit that outputs a reference voltage corresponding to a short-circuit voltage threshold for determining whether or not a short circuit can be performed in the cell C12. The short circuit determination reference voltage circuit 121 includes a resistor 121a and a short circuit determination reference power supply 121b. One end of the resistor 121a is connected to the positive terminal of the cell C12, the other end is connected to the positive terminal of the short-circuit determination reference power supply 121b, and the negative terminal of the short-circuit determination reference power supply 121b is connected to the negative terminal of the cell C12.

  The comparator CP <b> 12 is an element that compares the voltage of the cell C <b> 12 divided by the cell voltage dividing circuit 120 with the reference voltage output from the short-circuit determination reference voltage circuit 121. The comparator CP12 outputs a high level when the divided voltage of the cell C12 is higher than a reference voltage corresponding to the short-circuit voltage threshold. The non-inverting input terminal of the comparator CP12 is connected to the connection point between the resistor 120a and the resistor 120b, and the inverting input terminal is connected to the connection point between the resistor 121a and the short-circuit determination reference power supply 121b. The output terminal is connected to the transistor TR12 and the microcomputer CPU10.

  The transistor TR12 is a switching element for short-circuiting the cell C12. The short-circuit resistor R12 is an element for limiting a short-circuit current flowing through the cell C12 when the transistor TR12 short-circuits the cell C12. The base of the transistor TR12 is connected to the output terminal of the comparator CP12, the collector is connected to the positive terminal of the cell C12 via the short-circuit resistor R12, and the emitter is connected to the negative terminal of the cell C12.

  Here, the cell voltage dividing circuit 120 of the cell short circuit S12 has a voltage dividing ratio equal to the voltage dividing ratio of the cell voltage dividing circuit 110 of the cell short circuit S11, and the combined resistance value is the cell voltage dividing circuit 110. It is set to be larger than the combined resistance value. The short-circuit determination reference voltage circuit 111 of the cell short-circuit S11 and the short-circuit determination reference power supply circuit 121 of the cell short-circuit S12 include the resistance values of the resistors 111a and 121a, the short-circuit determination reference power supply 111b, and the short-circuit determination reference power supply. The internal resistance values of 121b are set to be equal to each other. Further, the comparator CP11 of the cell short circuit S11 and the comparator CP12 of the cell short circuit S12 are set so that the input impedances are equal to each other. That is, when the transistors TR11 and TR12 are in the off state, the cell short circuit S12 is set so that the input impedance is larger than that of the cell short circuit S11.

  Further, when the transistors TR11 and TR12 are turned on, the resistors R11 and R12 are connected between the input terminals of the cell short circuits S11 and S12. The resistors R11 and R12 are set such that when the transistors TR11 and TR12 are in the on state, the input impedances of the cell short circuits S11 and S12 are smaller than when the transistors TR11 and TR12 are in the off state.

  Cell short circuits S13 to S16 are connected to the cells C13 to C16, respectively. The cell short circuits S13 and S15 are the same circuits as the cell short circuit S11, and the cell short circuits S14 and S16 are the same circuits as the cell short circuit S12, respectively.

  The microcomputer CPU10 is an element that identifies and detects the disconnection that occurs between the cells C11 to C16 and the cell short circuits S11 to S16 based on the operating state of the cell short circuits S11 to S16. Microcomputer CPU10 outputs the data regarding a disconnection location to assembled battery controller 12, when a disconnection generate | occur | produces in at least any one between cell C11-C16 and cell short circuit S11-S16. The six input terminals of the microcomputer CPU10 are connected to the connection points of the comparators CP11 to CP16 of the cell short circuits S11 to S16 and the transistors TR11 to TR16, respectively. The output terminal is connected to the battery pack controller 12.

  Next, a specific operation will be described with reference to FIGS. The hybrid electric vehicle travels with the driving force of the engine during constant speed traveling with high engine operating efficiency. As shown in FIG. 1, at this time, when the charge amount of the assembled battery 10 is insufficient, the motor 4 functions as a generator by rotating by the driving force of the engine, and the assembled battery 10 is connected via the inverter 3. To charge. On the other hand, the hybrid electric vehicle travels by using the driving force of the motor 4 generated by the electric power supplied from the assembled battery 10 via the inverter 3 at the time of start-up and full acceleration when the operation efficiency of the engine is low. .

  The assembled battery system 1 supplies power from the assembled battery 10, and based on the voltages of the cell groups CG1 to CGn constituting the assembled battery 10, the outputs of the charge state control devices CEU1 to CEUn, and the current flowing through the assembled battery 10, Data on the state of the assembled battery 10 is output. The HEV controller 2 appropriately controls the motor 4 via the inverter 3 based on data regarding the state of the assembled battery 10 output from the assembled battery system 1.

  As shown in FIG. 2, for example, when the voltage of the cell C11 becomes larger than the short circuit voltage threshold, the voltage of the cell C11 is divided by the cell voltage dividing circuit 110 of the short circuit S11. The voltage of the cell C11 divided by the cell voltage dividing circuit 110 is compared with the reference voltage output from the short-circuit determination reference voltage circuit 111 by the comparator CP11. Since the voltage of the cell C11 is larger than the short-circuit voltage threshold, the comparator CP11 outputs a high level. When the output of the comparator CP11 becomes high level, the transistor TR11 is turned on, and the cell C11 is short-circuited through the resistor R11 to be discharged. The voltage of the cell C11 is reduced by discharging. When the voltage of the cell C11 becomes equal to or lower than the short circuit voltage threshold, the transistor TR11 is turned off and the discharge of the cell C11 is stopped.

  On the other hand, for example, when a disconnection occurs at a point A between the connection point of the adjacent cells C11 and C12 and the cell short circuit S11 and S12, all voltages of the cells C11 and C12 connected in series are input. The terminals are applied to the cell short circuits S11 and S12 connected in series.

  By the way, before the short circuit of the cell short circuits S11 and S12, the input impedance of the cell short circuit S12 is set to be larger than the input impedance of the cell short circuit S11. Therefore, a voltage higher than the voltage of the cell C12 determined by the ratio of the input impedances of the cell short circuits S11 and S12 is applied between the input terminals of the cell short circuit S12. The voltage between the input terminals of the cell short circuit S12 can be set higher than the short circuit voltage threshold by optimally setting the input impedance before the short circuit of the cell short circuits S11 and S12.

  The voltage between the input terminals of the cell short circuit S12 is divided by the cell voltage dividing circuit 120. The voltage between the input terminals of the cell short circuit S12 divided by the cell voltage voltage dividing circuit 120 is compared with the reference voltage output from the short-circuit determination reference voltage circuit 121 by the comparator CP12. Since the voltage between the input terminals of the cell short circuit S12 is larger than the short circuit voltage threshold, the comparator CP12 outputs a high level. When the comparator CP12 outputs a high level, the transistor TR12 is turned on, and the input terminals of the cell short circuit S12 are short-circuited via the resistor R12. When the input terminals of the cell short circuit S12 are short-circuited, the input impedance of the cell short circuit S12 becomes smaller than when the transistor TR12 is in the OFF state. By optimally setting the input impedance before the short circuit of the cell short circuit S11 and the input impedance after the short circuit of the cell short circuit S12, the voltage between the input terminals of the cell short circuit S12 is reduced to a voltage smaller than the short circuit voltage threshold. The voltage between the input terminals of the short circuit S11 can be set to a voltage greater than the short circuit voltage threshold.

  The voltage between the input terminals of the cell short circuit S12 is divided by the cell voltage dividing circuit 120. The voltage between the input terminals of the cell short circuit S12 divided by the cell voltage voltage dividing circuit 120 is compared with the reference voltage output from the short-circuit determination reference voltage circuit 121 by the comparator CP12. Since the voltage between the input terminals of the cell short circuit S12 is smaller than the short circuit voltage threshold, the comparator CP12 outputs a low level. When the comparator CP12 outputs a low level, the transistor TR12 is turned off, and the short circuit between the input terminals of the cell short circuit S12 is opened. Further, the voltage between the input terminals of the cell short circuit S11 is divided by the cell voltage dividing circuit 110. The voltage between the input terminals of the cell short circuit S11 divided by the cell voltage voltage dividing circuit 110 is compared with the reference voltage output from the short-circuit determination reference voltage circuit 111 by the comparator CP11. Since the voltage between the input terminals of the cell short circuit S11 is larger than the short circuit voltage threshold, the comparator CP11 outputs a high level. When the comparator CP11 outputs a high level, the transistor TR11 is turned on, and the input terminals of the cell short circuit S11 are short-circuited via the resistor R11.

  Thereafter, the cell short circuits S11 and S12 alternately and repeatedly short-circuit the input terminals of the short circuits S11 and S12 connected to the adjacent cells C11 and C12. The outputs of the comparators CP11 and CP12 are input to the microcomputer CPU10. When the outputs of the comparators CP11 and CP12 alternate between high level and low level, the microcomputer CPU10 generates a disconnection between the connection point between the adjacent cells C11 and C12 and the cell short circuit S11 and S12. It is determined that the battery is disconnected, and data relating to the disconnected portion is output to the battery pack controller 12. Similarly, it is possible to detect a disconnection occurring between a connection point of adjacent cells and a cell short circuit corresponding to those cells among C12 to C16 by identifying the disconnection point.

  Finally, specific effects will be described. According to the present embodiment, the charge state control device CEU1 is configured such that the cell short circuits S11 and S12 connected to the adjacent cells C11 and C12 are alternately and repeatedly short-circuited, whereby the cells C11 and C12 and the cell short circuits S11 and S12. It is possible to identify the occurrence location of disconnection between the two. Therefore, it is possible to improve the reliability of the charge state detection device CEU1 and the charge state detection devices CEU2 to CUn having the same circuit configuration.

  Further, the charging state control device CEU1 reliably sets different input impedances before the short circuit between the input terminals of the cell short circuit S11 and S12 by setting the combined resistance values of the cell voltage dividing circuits 110 and 120 to different values. Can be set to a value.

  In the above-described embodiment, the example in which the combined resistance value of the cell voltage divider circuit is set to a different value in the cell short circuit connected to the adjacent cell is given. is not. For example, as shown in FIG. 3, between the input terminals of the cell short circuit S11, a resistor 112 is connected separately from the cell voltage divider 110, and the resistance value of this resistor is connected to an adjacent cell. Different values may be set for each. In this case, in all the cell short circuits, the cell voltage dividing circuit, the short-circuit determination reference voltage circuit, and the comparator can be shared, and an increase in the types of components constituting the circuit can be suppressed.

(Second Embodiment)
Next, FIG. 4 shows a circuit diagram of the charging state control device in the second embodiment. Here, the state-of-charge control devices CEU1 to CEUn, which are different from the assembled battery system 1 in the first embodiment, will be described, and the description of the common portions other than the necessary portions will be omitted. In addition, the same code | symbol is attached | subjected and demonstrated to the element same as 1st Embodiment.

  First, the specific configuration of the charge state control devices CEU1 to CEUn will be described in detail. Since the charge state control devices CEU1 to CUn have the same configuration, only the charge state control device CEU2 will be described here.

  As shown in FIG. 4, the charge state control device CEU2 includes a cell short circuit S2 (short circuit) and a microcomputer CPU 20 (disconnection detection circuit). The charge state control device CEU2 is connected to a cell group CG2 including six cells C21 to C26 connected in series.

  The cell short circuit S2 is a circuit that is connected to the cell group CG2 and discharges the cells C21 to C26 by short-circuiting when the voltages of the cells C21 to C26 constituting the cell group CG2 are larger than the short-circuit voltage threshold. The cell short circuit S2 includes a group voltage divider circuit 20, comparators CP21 to CP25, a logic circuit 21, transistors TR21 to TR26, and shorting resistors R21 to R26.

  The group voltage dividing circuit 20 equally divides the group voltage of the cell group CG2 according to the number of cells, and outputs a reference voltage corresponding to a short-circuit voltage threshold value for determining whether or not a short circuit can be performed in the cells C21 to C26. Circuit. The group voltage dividing circuit 20 includes resistors 20a to 20f. The resistors 20a to 20f are connected in series, and one end of the resistor 20a is connected to the positive terminal of the cell group CG2, and one end of the resistor 20f is connected to the negative terminal of the cell group CG2.

  The comparators CP21 to CP25 are elements that compare the voltage at the connection point of the cells C21 to C26 with the reference voltage output from the group voltage dividing circuit 20. The comparators CP21 to CP25 output a low level when the voltage at the connection point of the cells C21 to C26 is higher than the reference voltage corresponding to the short circuit voltage threshold. The non-inverting input terminals of the comparators CP21 to CP25 are connected to the connection points of the resistors 20a to 20f, and the inverting input terminals are connected to the connection points of the cells C21 to C26. The output terminal is connected to the logic circuit 21.

  The logic circuit 21 is a circuit that determines a cell to be short-circuited based on the outputs of the comparators CP21 to CP25. When the logic circuit 21 determines a cell to be short-circuited, the logic circuit 21 outputs a high level to the corresponding cell. The five input terminals of the logic circuit 21 are connected to the output terminals of the comparators CP21 to CP25, and the six output terminals are connected to the transistor circuits TR21 to TR26 and the microcomputer CPU20, respectively.

  The transistors TR21 to TR26 are switching elements for short-circuiting the cells C21 to C26. The short-circuit resistors R21 to R26 are elements for limiting a short-circuit current flowing through the cells C21 to C26 when the transistors TR21 to TR26 short-circuit the cells C21 to C26. The bases of the transistors TR21 to TR26 are connected to the output terminal of the logic circuit 21, the collector is connected to the positive terminals of the cells C21 to C26 via the short-circuit resistors R21 to R26, and the emitter is connected to the negative terminals of the cells C21 to C26. .

  Here, when the transistors TR21 and TR22 are in the OFF state, the input impedance between the input terminals of the short circuit S2 to which the cell C22 is connected becomes larger than the input impedance between the input terminals of the short circuit S2 to which the cell C21 is connected. Is set to Further, when the transistors TR21 and TR22 are turned on, the resistors R21 and R22 are connected between the input terminals of the short circuit S2 to which the cells C21 and C22 are connected. The resistors R21 and R22 are configured such that when the transistors TR21 and TR22 are on, the input impedance between the input terminals of the short circuit S2 connected to the cells C21 and C22 is smaller than when the transistors TR21 and TR22 are off. Is set.

  The input impedance between the input terminals of the short circuit S2 connected to the cells C23 and C25 is set to be equal to the input impedance between the input terminals of the short circuit S2 connected to the cell C21. The input impedance between the input terminals of the short circuit S2 to which the cells C24 and C25 are connected is set to be equal to the input impedance between the input terminals of the short circuit S2 to which the cell C22 is connected.

  The microcomputer CPU 20 is an element that identifies and detects the disconnection occurring between the cells C21 to C26 and the cell short circuit S2 based on the operating state of the cell short circuit S2. The microcomputer CPU 20 outputs data relating to the disconnection location to the assembled battery controller 12 when disconnection occurs in at least one of the cells C21 to C26 and the cell short circuit S2. The six input terminals of the microcomputer CPU20 are connected to the connection points of the logic circuit 21 of the cell short circuit S2 and the transistors TR21 to TR26, respectively. The output terminal is connected to the battery pack controller 12.

  Next, a specific operation will be described with reference to FIG. As shown in FIG. 4, for example, when the voltage of the cell C21 becomes larger than the other cells C22 to C26, the voltages at the connection points of the cells C21 to C26 are output from the group voltage dividing circuit 20 by the comparators CP21 to CP26. To be compared with a reference voltage. The outputs of the comparators CP21 to CP26 are input to the logic circuit 21, and it is determined whether or not a short circuit can be performed for each cell. The logic circuit 21 turns on the transistor TR21 based on the determination result. When the transistor TR21 is turned on, the cell C21 is short-circuited through the resistor R21 and discharged. The voltage of the cell C21 is reduced by discharging. When the voltage of the cell C21 becomes equal to the voltages of the other cells C22 to C26, the transistor TR21 is turned off and the discharge of the cell C21 is stopped.

  On the other hand, for example, when a disconnection occurs at a point B between the connection point of the adjacent cells C21 and C22 and the cell short circuit S2, all voltages of the cells C21 and C22 connected in series are Applied between the corresponding input terminals of S2.

  By the way, before the short circuit of the cell short circuit S2, the input impedance between the input terminals connected to the cell C22 is set to be larger than the input impedance between the input terminals connected to the cell C21. Therefore, a voltage larger than the voltage between the input terminals connected to the cell C21 determined by the ratio of the input impedance between the input terminals connected to the cells C21 and C22 is applied between the input terminals connected to the cell C22. . Therefore, the voltage at the connection point between the cells C21 and C22 is larger than that before disconnection. The voltage at the connection point of the cells C21 and C22 can be set to a voltage higher than the short-circuit voltage threshold of the cell C22 by optimally setting the input impedance between the input terminals before the short circuit of the cell short circuit S2.

  The voltages at the connection points of the cells C21 to C26 are compared with the reference voltage output from the group voltage dividing circuit 20 by the comparators CP21 to CP26. Since the voltage at the connection point of the cells C21 and C22 is larger than the short-circuit voltage threshold, the logic circuit 21 turns on the transistor TR22 based on the determination result, and short-circuits between the input terminals connected to the cell C22 via the resistor R22. . By short-circuiting between the input terminals to which the cell C22 is connected, the input impedance between the input terminals becomes smaller than when the transistor TR22 is in the OFF state. The voltage at the connection point of the cells C21 and C22 is set to a voltage higher than the short-circuit voltage threshold of the cell C21 by optimally setting the input impedance between the input terminals before and after the short-circuit of the cell short circuit S2. A smaller voltage can be used.

The voltages at the connection points of the cells C21 to C26 are compared with the reference voltage output from the group voltage dividing circuit 20 by the comparators CP21 to CP26. Since the voltage at the connection point of the cells C21 and C22 is smaller than the short-circuit voltage threshold of the cell C22, the logic circuit 21 turns off the transistor TR22 based on the determination result, and the short circuit between the input terminals connected to the cell C22 is opened. The
Further, since the voltage at the connection point of the cells C21 and C22 is larger than the short-circuit voltage threshold value of the cell C21, the logic circuit 21 turns on the transistor TR21 based on the determination result, and the input connected to the cell C21 via the resistor R21. Short-circuit between terminals.

  Thereafter, the cell short circuit S2 alternately and repeatedly shorts the input terminals connected to the adjacent cells C21 and C22. Outputs corresponding to the transistors TR21 and TR22 of the logic circuit 21 are input to the microcomputer CPU20. When the output corresponding to the transistors TR21 and TR22 of the logic circuit 21 alternately repeats the high level / low level, the microcomputer CPU20 is connected between the connection point between the adjacent cells C21 and C22 and the cell short circuit S2. It is determined that a disconnection has occurred, and data relating to the disconnection location is output to the assembled battery controller 12. Similarly, it is possible to detect a disconnection occurring between a connection point of adjacent cells and a cell short circuit corresponding to those cells among C22 to C26 by specifying the disconnection point.

  Finally, specific effects will be described. According to the present embodiment, the charge state control device CEU2 is configured such that the cell short circuit S2 connected to the adjacent cells C21 and C22 is alternately and repeatedly short-circuited, so that the cell C21 and C22 and the cell short circuit S2 are connected. The occurrence location of disconnection can be specified. Therefore, the reliability of the charge state detection device CEU2 and the charge state detection devices CEU1 and CEU3 to CUn having the same circuit configuration can be improved.

(Third embodiment)
Next, FIG. 5 shows a circuit diagram of the charging state control device in the third embodiment. Here, the state-of-charge control devices CEU1 to CEUn, which are different from the assembled battery system 1 in the first embodiment, will be described, and the description of the common portions other than the necessary portions will be omitted. In addition, the same code | symbol is attached | subjected and demonstrated to the element same as 1st Embodiment.

  First, the specific configuration of the charge state control devices CEU1 to CEUn will be described in detail. Since the charge state control devices CEU1 to CUn have the same configuration, only the charge state control device CEU1 will be described here.

  As shown in FIG. 5, the charge state control device CEU1 includes cell short circuits S11 to S16 (short circuit), overcharge / discharge detection circuits UL11 to UL16 (abnormality detection circuit), and microcomputer CPU11 (disconnection detection circuit). It is composed of The charge state control device CEU1 in the third embodiment newly adds overcharge / discharge detection circuits UL11 to UL16 to the charge state control device CEU1 in the first embodiment, and replaces the microcomputer CPU10 with a microcomputer. The CPU 11 is provided.

  Overcharge / discharge detection circuits UL11 to UL16 are connected to the corresponding cells C11 to C16, respectively, and when the voltages of the cells C11 to C16 are larger than the overcharge voltage threshold, the cells C11 to C16 are determined to be in an overcharge state. When the high level is smaller than the overdischarge voltage threshold, the cells C11 to C16 are determined to be in the overdischarge state, and each of the circuits outputs a low level.

  The overcharge / discharge detection circuit UL11 includes a cell voltage dividing circuit 113, an overcharge determination reference voltage circuit 114, a comparator CP111, an overdischarge determination reference voltage circuit 115, and a comparator CP112. It is connected.

  The cell voltage dividing circuit 113 is a circuit that divides and outputs the voltage of the cell C11. The cell voltage dividing circuit 113 includes resistors 113a and 113b. The resistor 113a and the resistor 113b are connected in series. One end of the resistor 113a is connected to the positive terminal of the cell C11, and one end of the resistor 113b is connected to the negative terminal of the cell C11.

  The overcharge determination reference voltage circuit 114 is a circuit that outputs an overcharge voltage threshold for determining the presence or absence of an overcharge state in the cell C11, for example, a reference voltage corresponding to a cell voltage of 4.2V. The overcharge determination reference voltage circuit 114 includes a resistor 114a and an overcharge determination reference power supply 114b. One end of the resistor 114a is connected to the positive terminal of the cell C11, the other end is connected to the positive terminal of the overcharge determination reference power supply 114b, and the negative terminal of the overcharge determination reference power supply 114b is connected to the negative terminal of the cell C11. Yes.

  The comparator CP111 is an element that compares the voltage of the cell C11 divided by the cell voltage dividing circuit 113 with the reference voltage output from the overcharge determination reference voltage circuit 114. The comparator CP111 outputs a high level when the divided voltage of the cell C11 is higher than a reference voltage corresponding to the overcharge voltage threshold. The non-inverting input terminal of the comparator CP111 is connected to the connection point between the resistors 113a and 113b, and the inverting input terminal is connected to the connection point between the resistor 114a and the overcharge determination reference power supply 114b. The output terminal is connected to the input terminal of the microcomputer CPU11.

  The overdischarge determination reference voltage circuit 115 is a circuit that outputs an overdischarge voltage threshold for determining the presence or absence of an overdischarge state in the cell C11, for example, a reference voltage corresponding to a cell voltage of 3.0V. The overdischarge determination reference voltage circuit 115 includes a resistor 115a and an overdischarge determination reference power supply 115b. One end of the resistor 115a is connected to the positive terminal of the cell C11, the other end is connected to the positive terminal of the overdischarge determination reference power supply 115b, and the negative terminal of the overdischarge determination reference power supply 115b is connected to the negative terminal of the cell C11. Yes.

  The comparator CP112 is an element that compares the voltage of the cell C11 divided by the cell voltage dividing circuit 113 with the reference voltage output from the overdischarge determination reference voltage circuit 115. The comparator CP112 outputs a low level when the divided voltage of the cell C11 is smaller than the reference voltage corresponding to the overdischarge voltage threshold. The non-inverting input terminal of the comparator CP112 is connected to the connection point between the resistors 113a and 113b, and the inverting input terminal is connected to the connection point between the resistor 115a and the overdischarge determination reference power supply 115b. The output terminal is connected to the input terminal of the microcomputer CPU11.

  An overcharge / discharge detection circuit UL12 is connected to the cell C12 adjacent to the cell C11. The overcharge / discharge detection circuit UL12 includes a cell voltage dividing circuit 123, an overcharge determination reference voltage circuit 124, a comparator CP121, an overdischarge determination reference voltage circuit 125, and a comparator CP122.

  The cell voltage dividing circuit 123 is a circuit that divides and outputs the voltage of the cell C12. The cell voltage dividing circuit 123 includes resistors 123a and 123b. The resistor 123a and the resistor 123b are connected in series, and one end of the resistor 123a is connected to the positive terminal of the cell C12, and one end of the resistor 123b is connected to the negative terminal of the cell C12.

  The overcharge determination reference voltage circuit 124 is a circuit that outputs an overcharge voltage threshold for determining the presence or absence of an overcharge state in the cell C12, for example, a reference voltage corresponding to a cell voltage of 4.2V. The overcharge determination reference voltage circuit 124 includes a resistor 124a and an overcharge determination reference power supply 124b. One end of the resistor 124a is connected to the positive terminal of the cell C12, the other end is connected to the positive terminal of the overcharge determination reference power supply 124b, and the negative terminal of the overcharge determination reference power supply 124b is connected to the negative terminal of the cell C12. Yes.

  The comparator CP121 is an element that compares the voltage of the cell C12 divided by the cell voltage dividing circuit 123 with the reference voltage output from the overcharge determination reference voltage circuit 124. The comparator CP121 outputs a high level when the divided voltage of the cell C12 is higher than a reference voltage corresponding to the overcharge voltage threshold. The non-inverting input terminal of the comparator CP121 is connected to the connection point between the resistors 123a and 123b, and the inverting input terminal is connected to the connection point between the resistor 124a and the overcharge determination reference power supply 124b. The output terminal is connected to the input terminal of the microcomputer CPU11.

  The overdischarge determination reference voltage circuit 125 is a circuit that outputs an overdischarge voltage threshold for determining the presence or absence of an overdischarge state in the cell C12, for example, a reference voltage corresponding to a cell voltage of 3.0V. The overdischarge determination reference voltage circuit 125 includes a resistor 125a and an overdischarge determination reference power supply 125b. One end of the resistor 125a is connected to the positive terminal of the cell C12, the other end is connected to the positive terminal of the overdischarge determination reference power supply 125b, and the negative terminal of the overdischarge determination reference power supply 125b is connected to the negative terminal of the cell C12. Yes.

  The comparator CP122 is an element that compares the voltage of the cell C12 divided by the cell voltage dividing circuit 123 with the reference voltage output from the overdischarge determination reference voltage circuit 125. The comparator CP122 outputs a low level when the divided voltage of the cell C12 is smaller than the reference voltage corresponding to the overdischarge voltage threshold. The non-inverting input terminal of the comparator CP122 is connected to the connection point between the resistors 123a and 123b, and the inverting input terminal is connected to the connection point between the resistor 125a and the overdischarge determination reference power supply 125b. The output terminal is connected to the input terminal of the microcomputer CPU11.

  Here, the overcharge / discharge detection circuit UL11 and the overcharge / discharge detection circuit UL12 are set so that their input impedances are equal to each other. By the way, since the cell short circuits S11 to S16 have the same configuration as that of the first embodiment, when the transistors TR11 and TR12 are in the off state, the cell short circuit S12 is set so that the input impedance is larger than that of the cell short circuit S11. Has been. Further, when the transistors TR11 and TR12 are turned on, the resistors R11 and R12 are connected between the input terminals of the cell short circuits S11 and S12.

  Therefore, when the transistors TR11 and TR12 are in the off state, the combined input impedance of the short circuit S12 and the overcharge / discharge detection circuit UL12 is larger than the combined input impedance of the short circuit S11 and the overcharge / discharge detection circuit UL11. When the transistors TR11 and TR12 are in the on state, the combined input impedance of the short circuit S11 and the overcharge / discharge detection circuit UL11, the short circuit S12 and the overcharge / discharge detection circuit UL12 is smaller than that when the transistors TR11 and TR12 are in the off state. Become.

  Cell short circuits S13 to S16 and overcharge / discharge detection circuits UL13 to UL16 are connected to the cells C13 to C16, respectively. Since the overcharge / discharge detection circuits UL13 to UL16 are the same circuits as the overcharge / discharge detection circuits UL11 and UL12, description thereof is omitted.

  The microcomputer CPU11 detects the overcharge and overdischarge states of the cells C11 to C16 based on the outputs of the overcharge / discharge detection circuits UL11 to UL16, and also detects the cells C11 to C16, the short circuits S11 to S16, and the overcharge / discharge. This is an element for detecting a disconnection occurring between the detection circuits UL11 to UL16 by specifying the disconnection location. When at least one of the cells C11 to C16 is in an overcharged state or an overdischarged state, the microcomputer CPU11 outputs data relating to the cell in the overcharged state or the overdischarged state. Alternatively, when a disconnection occurs in at least one of the cells C11 to C16, the short circuits S11 to S16, and the overcharge detection circuits UL11 to UL16, data relating to the disconnection point is output to the assembled battery controller 12. The 12 input terminals of the microcomputer CPU11 are connected to the output terminals of the comparators of the overcharge / discharge detection circuits UL11 to UL16, respectively. The output terminal is connected to the battery pack controller 12.

  Next, a specific operation will be described with reference to FIG. As shown in FIG. 5, for example, when the voltage of the cell C11 becomes larger than the overcharge voltage threshold value of 4.2V, the voltage of the cell C11 is divided by the cell voltage voltage dividing circuit 113 of the overcharge / discharge detection circuit UL11. Is done. The voltage of the cell C11 divided by the cell voltage dividing circuit 113 is compared with the reference voltage output from the overcharge determination reference voltage circuit 114 by the comparator CP111. Since the voltage of the cell C11 is larger than the overcharge voltage threshold, the comparator CP111 outputs a high level. When the output of the comparator CP111 becomes high level, the microcomputer CPU11 outputs data indicating that the cell C11 is in an overcharged state.

  Further, when the voltage of the cell C11 becomes smaller than the overdischarge voltage threshold value of 3.0V, the voltage of the cell C11 is divided by the cell voltage dividing circuit 113 of the overcharge / discharge detection circuit UL11. The voltage of the cell C11 divided by the cell voltage dividing circuit 113 is compared with the reference voltage output from the overdischarge determination reference voltage circuit 115 by the comparator CP112. Since the voltage of the cell C11 is smaller than the overdischarge voltage threshold, the comparator CP112 outputs a low level. When the output of the comparator CP112 becomes low level, the microcomputer CPU11 outputs data indicating that the cell C11 is in an overdischarged state.

  On the other hand, for example, when a disconnection occurs at the point C between the connection point of the adjacent cells C11 and C12 and the cell short circuit S11 and S12 and the overcharge / discharge detection circuits UL11 and UL12, in the first embodiment As described, the cell short circuits S11 and S12 alternately short-circuit between the input terminals. Thereby, the voltage between the input terminals of cell short circuit S11, S12 also changes alternately and repeatedly. At this time, the voltage between the input terminals of the cell short circuits S11 and S12 is set to an input impedance before and after the short circuit of the cell short circuits S11 and S12, so that one is set to a voltage larger than the overcharge voltage threshold and the other is The voltage can be lower than the overdischarge voltage threshold. For example, when the voltage between the input terminals of the cell short circuit S11 is smaller than the overdischarge voltage threshold and the voltage between the input terminals of the cell short circuit S12 is larger than the overcharge voltage threshold, the overcharge / discharge detection circuit UL11 is The overcharge state is detected by the overcharge / discharge detection circuit UL12. When the overcharge / discharge detection circuit UL11 detects the overdischarge state, the comparators CP111 and CP112 output a low level. When the overcharge / discharge detection circuit UL12 detects an overcharge state, the comparators CP121 and CP122 output a high level.

  On the other hand, when the voltage between the input terminals of the cell short circuit S11 is larger than the overcharge voltage threshold and the voltage between the input terminals of the cell short circuit S12 is smaller than the overdischarge voltage threshold, the overcharge / discharge detection circuit. UL11 detects the overcharge state, and the overcharge / discharge detection circuit UL12 detects the overdischarge state. When the overcharge / discharge detection circuit UL11 detects an overcharge state, the comparators CP111 and CP112 output a high level. The overcharge / discharge detection circuit UL12 detects an overdischarge state, and the comparators CP121 and CP122 each output a low level.

  Thereafter, the overcharge / discharge detection circuits UL11 and UL12 repeatedly detect the overcharge state and the overdischarge state alternately. The outputs of the comparators CP111, CP112, CP121, CP122 are input to the microcomputer CPU11. When the outputs of the comparators CP111, CP112, CP121, and CP122 repeat high level / low level alternately, the microcomputer CPU11 connects the connection points between the adjacent cells C11 and C12, the cell short circuits S11 and S12, and the overcharge. It is determined that a disconnection has occurred between the discharge detection circuits UL11 and UL12, and data relating to the disconnection location is output to the assembled battery controller 12. In the same manner, among C12 to C16, the disconnection that occurs between the connection point of adjacent cells and the cell short circuit and overcharge / discharge detection circuit corresponding to those cells is identified and detected. Can do.

  Finally, specific effects will be described. According to the present embodiment, in the charge state control device CEU1, the overcharge / discharge detection circuits UL11 and UL12 connected to the adjacent cells C11 and C12 repeatedly detect the overcharge state and the overdischarge state alternately. Thus, it is possible to specify the occurrence of disconnection between the cells C11 and C12, the cell short circuits S11 and S12, and the overcharge / discharge detection circuits UL11 and UL12. Therefore, it is possible to improve the reliability of the charge state detection device CEU1 and the charge state detection devices CEU2 to CUn having the same circuit configuration.

  In addition, the charging state control device CEU1 sets the combined resistance values of the cell voltage dividing circuits 110 and 120 of the cell short circuit S11 and S12 to different values, so that the cell short circuits S11 and S12 and the overcharge / discharge detection circuit UL11. , The input impedance before the short circuit between the input terminals of the UL 12 can be reliably set to different values.

  In the above-described embodiment, the example in which the combined resistance value of the cell voltage divider circuit is set to a different value in the cell short circuit connected to the adjacent cell is given. is not. For example, as shown in FIG. 6, a resistor 112 is connected between the input terminals of the cell short circuit S11 in addition to the cell voltage divider 110, and the resistance value of this resistor is connected to an adjacent cell. Different values may be set for each. Further, as shown in FIG. 7, a resistor 116 is connected between the input terminals of the overcharge / discharge detection circuit UL11 separately from the cell voltage voltage dividing circuit 113, and the resistance value of this resistor is connected to the adjacent cell. Different values may be set for each short circuit. In this case, in all the cell short circuits, the cell voltage dividing circuit, the short-circuit determination reference voltage circuit, and the comparator can be shared, and an increase in the types of components constituting the circuit can be suppressed.

  Moreover, although the example which detects a disconnection with an overcharge / discharge detection circuit is given in the above-described embodiment, the present invention is not limited to this. For example, the disconnection may be detected using an overcharge detection circuit that detects an overcharge state or an overdischarge detection circuit that detects an overdischarge state.

(Fourth embodiment)
Next, FIG. 8 shows a circuit diagram of the charging state control device in the fourth embodiment. Here, the charge state control devices CEU1 to CEUn, which are different from the assembled battery system 1 in the second embodiment, will be described, and the description of the common portions other than the necessary portions will be omitted. In addition, the same code | symbol is attached | subjected and demonstrated to the element same as 2nd Embodiment.

  First, the specific configuration of the charge state control devices CEU1 to CEUn will be described in detail. Since the charge state control devices CEU1 to CUn have the same configuration, only the charge state control device CEU2 will be described here.

  As shown in FIG. 8, the charge state control device CEU2 includes a cell short circuit S2 (short circuit), overcharge / discharge detection circuits UL21 to UL26, and a microcomputer CPU21 (disconnection detection circuit). The charge state control device CEU2 is connected to a cell group CG2 including six cells C21 to C26 connected in series. The charge state control device CEU2 according to the fourth embodiment newly adds overcharge / discharge detection circuits UL21 to UL26 to the charge state control device CEU2 according to the second embodiment, and replaces the microcomputer CPU20 with a microcomputer. In this configuration, a CPU 21 is provided.

  The overcharge / discharge detection circuits UL21 to UL16 are connected to the corresponding cells C21 to C26, respectively, and when the voltages of the cells C21 to C26 are larger than the overcharge voltage threshold, the cells C21 to C26 are determined to be in an overcharge state. When the high level is smaller than the overdischarge voltage threshold, the cells C21 to C26 are determined to be in the overdischarge state, and each of the circuits outputs a low level.

  The overcharge / discharge detection circuit UL21 includes a cell voltage dividing circuit 213, an overcharge determination reference voltage circuit 214, a comparator CP211, an overdischarge determination reference voltage circuit 215, and a comparator CP212. It is connected.

  The cell voltage divider circuit 213 is a circuit that divides and outputs the voltage of the cell C21. The cell voltage dividing circuit 213 includes resistors 213a and 213b. The resistor 213a and the resistor 213b are connected in series. One end of the resistor 213a is connected to the positive terminal of the cell C21, and one end of the resistor 213b is connected to the negative terminal of the cell C21.

  The overcharge determination reference voltage circuit 214 is a circuit that outputs an overcharge voltage threshold for determining the presence or absence of an overcharge state in the cell C21, for example, a reference voltage corresponding to a cell voltage of 4.2V. The overcharge determination reference voltage circuit 214 includes a resistor 214a and an overcharge determination reference power source 214b. One end of the resistor 214a is connected to the positive terminal of the cell C21, the other end is connected to the positive terminal of the overcharge determination reference power source 214b, and the negative terminal of the overcharge determination reference power source 214b is connected to the negative terminal of the cell C21. Yes.

  The comparator CP211 is an element that compares the voltage of the cell C21 divided by the cell voltage dividing circuit 213 with the reference voltage output from the overcharge determination reference voltage circuit 214. The comparator CP211 outputs a high level when the divided voltage of the cell C21 is higher than a reference voltage corresponding to the overcharge voltage threshold. The non-inverting input terminal of the comparator CP211 is connected to the connection point between the resistors 213a and 213b, and the inverting input terminal is connected to the connection point between the resistor 214a and the overcharge determination reference power source 214b. The output terminal is connected to the input terminal of the microcomputer CPU21.

  The overdischarge determination reference voltage circuit 215 is a circuit that outputs an overdischarge voltage threshold for determining the presence or absence of an overdischarge state in the cell C21, for example, a reference voltage corresponding to a cell voltage of 3.0V. The overdischarge determination reference voltage circuit 215 includes a resistor 215a and an overdischarge determination reference power supply 215b. One end of the resistor 215a is connected to the positive terminal of the cell C21, the other end is connected to the positive terminal of the overdischarge determination reference power supply 215b, and the negative terminal of the overdischarge determination reference power supply 215b is connected to the negative terminal of the cell C21. Yes.

  The comparator CP212 is an element that compares the voltage of the cell C21 divided by the cell voltage dividing circuit 213 with the reference voltage output from the overdischarge determination reference voltage circuit 215. The comparator CP212 outputs a low level when the divided voltage of the cell C21 is smaller than the reference voltage corresponding to the overdischarge voltage threshold. The non-inverting input terminal of the comparator CP212 is connected to the connection point between the resistors 213a and 213b, and the inverting input terminal is connected to the connection point between the resistor 215a and the overdischarge determination reference power source 215b. The output terminal is connected to the input terminal of the microcomputer CPU21.

  An overcharge / discharge detection circuit UL22 is connected to the cell C22 adjacent to the cell C21. The overcharge / discharge detection circuit UL22 includes a cell voltage dividing circuit 223, an overcharge determination reference voltage circuit 224, a comparator CP221, an overdischarge determination reference voltage circuit 225, and a comparator CP222.

  The cell voltage dividing circuit 223 is a circuit that divides and outputs the voltage of the cell C22. The cell voltage dividing circuit 223 includes resistors 223a and 223b. The resistors 223a and 223b are connected in series. One end of the resistor 223a is connected to the positive terminal of the cell C22, and one end of the resistor 223b is connected to the negative terminal of the cell C22.

  The overcharge determination reference voltage circuit 224 is a circuit that outputs an overcharge voltage threshold for determining the presence or absence of an overcharge state in the cell C22, for example, a reference voltage corresponding to a cell voltage of 4.2V. The overcharge determination reference voltage circuit 224 includes a resistor 224a and an overcharge determination reference power supply 224b. One end of the resistor 224a is connected to the positive terminal of the cell C22, the other end is connected to the positive terminal of the overcharge determination reference power supply 224b, and the negative terminal of the overcharge determination reference power supply 224b is connected to the negative terminal of the cell C22. Yes.

  The comparator CP221 is an element that compares the voltage of the cell C22 divided by the cell voltage divider circuit 223 with the reference voltage output from the overcharge determination reference voltage circuit 224. The comparator CP221 outputs a high level when the divided voltage of the cell C22 is higher than a reference voltage corresponding to the overcharge voltage threshold. The non-inverting input terminal of the comparator CP221 is connected to the connection point of the resistors 223a and 223b, and the inverting input terminal is connected to the connection point of the resistor 224a and the overcharge determination reference power source 224b. The output terminal is connected to the input terminal of the microcomputer CPU21.

  The overdischarge determination reference voltage circuit 225 is a circuit that outputs an overdischarge voltage threshold for determining the presence or absence of an overdischarge state in the cell C22, for example, a reference voltage corresponding to a cell voltage of 3.0V. The overdischarge determination reference voltage circuit 225 includes a resistor 225a and an overdischarge determination reference power supply 225b. One end of the resistor 225a is connected to the positive terminal of the cell C22, the other end is connected to the positive terminal of the overdischarge determination reference power supply 225b, and the negative terminal of the overdischarge determination reference power supply 225b is connected to the negative terminal of the cell C22. Yes.

  The comparator CP222 is an element that compares the voltage of the cell C22 divided by the cell voltage dividing circuit 223 with the reference voltage output from the overdischarge determination reference voltage circuit 225. The comparator CP222 outputs a low level when the divided voltage of the cell C22 is smaller than a reference voltage corresponding to the overdischarge voltage threshold. The non-inverting input terminal of the comparator CP222 is connected to the connection point between the resistors 223a and 223b, and the inverting input terminal is connected to the connection point between the resistor 225a and the overdischarge determination reference power source 225b. The output terminal is connected to the input terminal of the microcomputer CPU21.

  Here, the overcharge / discharge detection circuit UL21 and the overcharge / discharge detection circuit UL22 are set so that their input impedances are equal to each other. By the way, since the cell short circuit S2 has the same configuration as that of the second embodiment, when the transistors TR21 and TR22 are in the OFF state, the input impedance between the input terminals of the short circuit S2 to which the cell C22 is connected is It is set to be larger than the input impedance between the input terminals of the connected short circuit S2. Further, when the transistors TR21 and TR22 are turned on, the resistors R21 and R22 are connected between the input terminals of the short circuit S2 to which the cells C21 and C22 are connected.

  Therefore, when the transistors TR21 and TR22 are in the OFF state, the combined input impedance of the short circuit S2 connected to the cell C22 and the overcharge / discharge detection circuit UL22 is the short circuit S2 connected to the cell C21 and the overcharge / discharge detection circuit UL21. Is greater than the combined input impedance. When the transistors TR11 and TR12 are in the on state, the combined input impedance of the short circuit S2 and the overcharge / discharge detection circuit UL21 to which the cell C21 is connected and the short circuit S2 and the overcharge / discharge detection circuit UL22 to which the cell C22 is connected is This is smaller than when the transistors TR21 and TR22 are off.

  A cell short circuit S2 and overcharge / discharge detection circuits UL23 to UL26 are connected to the cells C23 to C26, respectively. Since the overcharge / discharge detection circuits UL23 to UL26 are the same circuits as the overcharge / discharge detection circuits UL21 and UL22, description thereof is omitted.

  The microcomputer CPU21 detects the overcharge state and the overdischarge state of the cells C21 to C26 based on the outputs of the overcharge / discharge detection circuits UL21 to UL26, and the cells C21 to C26, the short circuit S2, and the overcharge / discharge detection circuit. It is an element which detects the disconnection which generate | occur | produces between UL22-UL26, specifying a disconnection location. When at least one of the cells C21 to C26 is in an overcharged state or an overdischarged state, the microcomputer CPU21 outputs data relating to the cell in the overcharged state or the overdischarged state. Alternatively, when a disconnection occurs in at least one of the cells C21 to C26, the short circuit S2, and the overcharge detection circuits UL21 to UL26, data relating to the disconnection point is output to the assembled battery controller 12. Twelve input terminals of the microcomputer CPU 21 are connected to output terminals of comparators of the overcharge / discharge detection circuits UL21 to UL212, respectively. The output terminal is connected to the battery pack controller 12.

  Next, a specific operation will be described with reference to FIG. As shown in FIG. 8, for example, when a disconnection occurs at a point D between the connection point of adjacent cells C21 and C22 and the cell short circuit S2 and the overcharge / discharge detection circuits UL21 and UL22, the second embodiment As described in, the cell short circuit S2 repeatedly short-circuits between the input terminals. Thereby, the voltage between the input terminals to which the cells C21 and C22 are connected also changes alternately and repeatedly. At this time, the voltage between the input terminals to which the cells C21 and C22 are connected is optimally set to the input impedance before and after the short circuit of the cell short circuit S2, so that one of the voltages is larger than the overcharge voltage threshold and the other is excessive. The voltage can be lower than the discharge voltage threshold. For example, when the voltage between the input terminals connected to the cell C21 is smaller than the overdischarge voltage threshold and the voltage between the input terminals of the cell C22 is larger than the overcharge voltage threshold, the overcharge / discharge detection circuit UL21 is overcharged. The overcharge / discharge detection circuit UL22 detects the overcharge state. When the overcharge / discharge detection circuit UL21 detects the overdischarge state, the comparators CP211 and CP212 output a low level. When the overcharge / discharge detection circuit UL22 detects an overcharge state, the comparators CP221 and CP222 output a high level.

  On the other hand, when the voltage between the input terminals connected to the cell C21 is larger than the overcharge voltage threshold and the voltage between the input terminals connected to the cell C22 is smaller than the overdischarge voltage threshold, The detection circuit UL21 detects an overcharge state, and the overcharge / discharge detection circuit UL22 detects an overdischarge state. When the overcharge / discharge detection circuit UL21 detects an overcharge state, the comparators CP211 and CP212 output a high level. The overcharge / discharge detection circuit UL22 detects an overdischarge state, and the comparators CP221 and CP222 output a low level, respectively.

  Thereafter, the overcharge / discharge detection circuits UL21, UL22 repeatedly detect the overcharge state and the overdischarge state alternately. The outputs of the comparators CP211, CP212, CP221, CP222 are input to the microcomputer CPU21. When the outputs of the comparators CP211, CP212, CP221, and CP222 alternately repeat high level / low level, the microcomputer CPU21 connects the connection point between the adjacent cells C21 and C22, the cell short circuit S2, and the overcharge / discharge detection. It is determined that a disconnection has occurred between the circuits UL21 and UL22, and data relating to the disconnection point is output to the assembled battery controller 12. Similarly, a disconnection occurring between a connection point of adjacent cells and a cell short circuit and an overcharge / discharge detection circuit corresponding to those cells among C22 to C26 is identified and detected. Can do.

  Finally, specific effects will be described. According to the present embodiment, the charge state control device CEU2 repeatedly detects the overcharge state and the overdischarge state alternately by the overcharge / discharge detection circuits UL21 and UL22 connected to the adjacent cells C21 and C22. In addition, it is possible to identify the occurrence of disconnection between the cells C21 and C22, the cell short circuit S2, and the overcharge / discharge detection circuits UL21 and UL22. Therefore, the reliability of the charge state detection device CEU2 and the charge state detection devices CEU1 and CEU3 to CUn having the same circuit configuration can be improved.

  In the above-described embodiment, an example in which disconnection is detected by the overcharge / discharge detection circuit is described. However, the present invention is not limited to this. For example, the disconnection may be detected using an overcharge detection circuit that detects an overcharge state or an overdischarge detection circuit that detects an overdischarge state.

(Fifth embodiment)
Next, FIG. 9 shows a circuit diagram of the charging state control apparatus in the fifth embodiment. Here, the state-of-charge control devices CEU1 to CEUn, which are different from the assembled battery system 1 in the first embodiment, will be described, and the description of the common portions other than the necessary portions will be omitted. In addition, the same code | symbol is attached | subjected and demonstrated to the element same as 1st Embodiment.

  First, the specific configuration of the charge state control devices CEU1 to CEUn will be described in detail. Since the charge state control devices CEU1 to CUn have the same configuration, only the charge state control device CEU1 will be described here.

  As shown in FIG. 9, the charge state control device CEU1 is composed of cell short circuits S11 to S16 (short circuit) and a microcomputer CPU 12 (disconnection detection circuit). The charge state control device CEU1 in the fifth embodiment adds an OR circuit in the cell short circuits S11 to S16 to the charge state control device CEU1 in the first embodiment, and replaces the microcomputer CPU10. The microcomputer CPU 12 is provided.

  The cell short circuit S11 includes a cell voltage dividing circuit 110, a short circuit determination reference voltage circuit 111, a comparator CP11, an OR circuit OR11, a transistor TR11, and a short circuit resistor R11, and is connected to the cell C11. ing.

  The OR circuit OR11 is a circuit that turns on / off the transistor TR11 based on the output of the comparator CP11 or the microcomputer CPU12. The input terminal of the OR circuit OR11 is connected to the output terminal of the comparator CP11, and the other input terminal is connected to the microcomputer CPU12. The output terminal is connected to the transistor TR11 and the microcomputer CPU12.

  A cell short circuit S12 is connected to the cell C12 adjacent to the cell C11. The cell short circuit S12 includes a cell voltage dividing circuit 120, a short circuit determination reference voltage circuit 121, a comparator CP12, an OR circuit OR12, a transistor TR12, and a short circuit resistor R12.

  The OR circuit OR12 is a circuit that turns on / off the transistor TR12 based on the output of the comparator CP12 or the microcomputer CPU12. The input terminal of the OR circuit OR12 is connected to the output terminal of the comparator CP12, and the other input terminal is connected to the microcomputer CPU12. The output terminal is connected to the transistor TR12 and the microcomputer CPU12.

  Here, when the transistors TR11 and TR12 are in the off state, the cell short circuits S11 and S12 are set so that the input impedances are equal. Further, when the transistors TR11 and TR12 are turned on, the resistors R11 and R12 are connected between the input terminals of the cell short circuits S11 and S12. The resistors R11 and R12 limit the short-circuit current flowing through the cells C11 and C12 when the transistors TR11 and TR12 are on, and the input impedance of the cell short-circuits S11 and S12 is greater than when the transistors TR11 and TR12 are off. It is set to be smaller.

  Cell short circuits S13 to S16 are connected to the cells C13 to C16, respectively. Since the cell short circuits S13 to S16 are the same circuits as the cell short circuits S11 and S12, respectively, description thereof is omitted.

  The microcomputer CPU12 temporarily shorts the cells C11 to C16 with the short circuits S11 to S16, and is generated between the cells C11 to C16 and the cell short circuits S11 to S16 from the operating state of the short circuits S11 to S16 thereafter. This is an element that detects the disconnection by identifying the disconnection location. Microcomputer CPU12 outputs the data regarding a disconnection location to assembled battery controller 12, when a disconnection generate | occur | produces in at least any one between cell C11-C16 and cell short circuit S11-S16. The six input terminals of the microcomputer CPU12 are connected to the connection points of the OR circuits OR11 to OR16 and the transistors TR11 to TR16, respectively. The six output terminals are connected to the input terminals of the OR circuits OR11 to OR16.

  Next, a specific operation will be described with reference to FIG. As shown in FIG. 9, for example, when the voltage of the cell C11 becomes larger than the short circuit voltage threshold, the voltage of the cell C11 is divided by the cell voltage dividing circuit 110 of the short circuit S11. The voltage of the cell C11 divided by the cell voltage dividing circuit 110 is compared with the reference voltage output from the short-circuit determination reference voltage circuit 111 by the comparator CP11. Since the voltage of the cell C11 is larger than the short-circuit voltage threshold, the comparator CP11 outputs a high level. When the output of the comparator CP11 becomes high level, the transistor TR11 is turned on via the OR circuit OR11, and the cell C11 is short-circuited and discharged via the resistor R11. The voltage of the cell C11 is reduced by discharging. When the voltage of the cell C11 becomes equal to or lower than the short circuit voltage threshold, the transistor TR11 is turned off and the discharge of the cell C11 is stopped.

  On the other hand, for example, when a disconnection occurs at a point E between the connection point of the adjacent cells C11 and C12 and the cell short circuit S11 and S12, all voltages of the cells C11 and C12 connected in series are input. The terminals are applied to the cell short circuits S11 and S12 connected in series. Here, the microcomputer CPU12 temporarily turns on the transistor TR11 via the OR circuit OR11, and short-circuits the input terminals of the cell short circuit S11 via the resistor R11. When the input terminals of the cell short circuit S11 are short-circuited, the input impedance of the cell short circuit S11 becomes smaller than when the transistor TR11 is in the OFF state. By optimally setting the input impedance after the short circuit of the cell short circuit S11 and the input impedance before the short circuit of the cell short circuit S12, the voltage between the input terminals of the cell short circuit S11 is reduced to a voltage smaller than the short circuit voltage threshold. The voltage between the input terminals of the short circuit S12 can be higher than the short circuit voltage threshold.

  The voltage between the input terminals of the cell short circuit S11 is divided by the cell voltage dividing circuit 110. The voltage between the input terminals of the cell short circuit S11 divided by the cell voltage voltage dividing circuit 110 is compared with the reference voltage output from the short-circuit determination reference voltage circuit 111 by the comparator CP11. Since the voltage between the input terminals of the cell short circuit S11 is smaller than the short circuit voltage threshold, the comparator CP11 outputs a low level. When the comparator CP11 outputs a low level, the transistor TR11 is turned off via the OR circuit OR11, and the short circuit between the input terminals of the cell short circuit S11 is opened. Further, the voltage between the input terminals of the cell short circuit S12 is divided by the cell voltage dividing circuit 120. The voltage between the input terminals of the cell short circuit S12 divided by the cell voltage voltage dividing circuit 120 is compared with the reference voltage output from the short-circuit determination reference voltage circuit 121 by the comparator CP12. Since the voltage between the input terminals of the cell short circuit S12 is larger than the short circuit voltage threshold, the comparator CP12 outputs a high level. When the comparator CP12 outputs a high level, the transistor TR12 is turned on via the OR circuit OR12, and the input terminals of the cell short circuit S12 are short-circuited via the resistor R12.

  Thereafter, the cell short circuits S11 and S12 alternately and repeatedly short-circuit the input terminals of the short circuits S11 and S12 connected to the adjacent cells C11 and C12. The outputs of the comparators CP11 and CP12 are input to the microcomputer CPU12. When the outputs of the comparators CP11 and CP12 alternate between high level and low level, the microcomputer CPU12 generates a disconnection between the connection point between the adjacent cells C11 and C12 and the cell short circuit S11 and S12. It is determined that the battery is disconnected, and data relating to the disconnected portion is output to the battery pack controller 12. Similarly, it is possible to detect a disconnection occurring between a connection point of adjacent cells and a cell short circuit corresponding to those cells among C12 to C16 by identifying the disconnection point.

  When detecting disconnection, it is not necessary to short-circuit all the cells. By short-circuiting every other adjacent cell, all disconnections between the cell and the cell short circuit can be detected. In addition, the cells may be short-circuited sequentially or simultaneously.

  Finally, specific effects will be described. According to the present embodiment, the charge state control device CEU1 is configured such that the cell short circuits S11 and S12 connected to the adjacent cells C11 and C12 are alternately and repeatedly short-circuited, whereby the cells C11 and C12 and the cell short circuits S11 and S12. It is possible to identify the occurrence location of disconnection between the two. Therefore, it is possible to improve the reliability of the charge state detection device CEU1 and the charge state detection devices CEU2 to CUn having the same circuit configuration.

(Sixth embodiment)
Next, FIG. 10 shows a circuit diagram of the charging state control device in the sixth embodiment. Here, the charge state control devices CEU1 to CEUn, which are different from the assembled battery system 1 in the second embodiment, will be described, and the description of the common portions other than the necessary portions will be omitted. In addition, the same code | symbol is attached | subjected and demonstrated to the element same as 2nd Embodiment.

  First, the specific configuration of the charge state control devices CEU1 to CEUn will be described in detail. Since the charge state control devices CEU1 to CUn have the same configuration, only the charge state control device CEU2 will be described here.

  As shown in FIG. 10, the state-of-charge control device CEU2 includes a cell short circuit S2 (short circuit) and a microcomputer CPU 22 (disconnection detection circuit). The charging state control device CEU2 in the sixth embodiment adds an OR circuit in the cell short circuits S21 to S26 to the charging state control device CEU2 in the second embodiment, and replaces the microcomputer CPU20. The microcomputer CPU 22 is provided.

  The cell short circuit S2 includes a group voltage dividing circuit 20, comparators CP21 to CP25, a logic circuit 21, OR circuits OR21 to OR26, transistors TR21 to TR26, and shorting resistors R21 to R26. It is connected to group CG2.

  The OR circuits OR21 to OR26 are circuits that turn on / off the transistors TR21 to TR26 based on the output of the logic circuit 21 or the microcomputer CPU22. The input terminals of the OR circuits OR21 to OR26 are connected to the output terminal of the logic circuit 21, and the other input terminals are connected to the microcomputer CPU22. The output terminal is connected to the transistors TR21 to TR26 and the microcomputer CPU22.

  Here, when the transistors TR21 and TR22 are in the OFF state, the input impedance between the input terminals of the short circuit S2 to which the cell C21 is connected is equal to the input impedance between the input terminals of the short circuit S2 to which the cell C22 is connected. Is set to Further, when the transistors TR21 and TR22 are turned on, the resistors R21 and R22 are connected between the input terminals of the short circuit S2 to which the cells C21 and C22 are connected. The resistors R21 and R22 are configured such that when the transistors TR21 and TR22 are on, the input impedance between the input terminals of the short circuit S2 connected to the cells C21 and C22 is smaller than when the transistors TR21 and TR22 are off. Is set.

  The input impedance between the input terminals of the short circuit S2 to which the cells C23 to C25 are connected is set to be equal to the input impedance between the input terminals of the short circuit S2 to which the cells C21 and C22 are connected.

  The microcomputer CPU22 detects the disconnection that occurs between the cells C21 to C26 and the cell short circuit S2 based on the operating state of the cell short circuit S2 to which the cells C21 to C26 are connected by specifying the disconnection location. It is an element. Microcomputer CPU22 outputs the data regarding a disconnection location to assembled battery controller 12, when a disconnection generate | occur | produces in at least any one between cell C21-C26 and cell short circuit S2. The six input terminals of the microcomputer CPU22 are connected to the connection points of the OR circuits OR21 to OR26 and the transistors TR21 to TR26, respectively. The six output terminals are connected to the input terminals of the OR circuits OR21 to OR26, and the other output terminals are connected to the assembled battery controller 12, respectively.

  Next, a specific operation will be described with reference to FIG. As shown in FIG. 10, for example, when the voltage of the cell C21 becomes larger than the other cells C22 to C26, the voltages at the connection points of the cells C21 to C26 are output from the group voltage dividing circuit 20 by the comparators CP21 to CP26. To be compared with a reference voltage. The outputs of the comparators CP21 to CP26 are input to the logic circuit 21, and it is determined whether or not a short circuit can be performed for each cell. Based on the determination result, the logic circuit 21 turns on the transistor TR21 via the OR circuit OR21. When the transistor TR21 is turned on, the cell C21 is short-circuited through the resistor R21 and discharged. The voltage of the cell C21 is reduced by discharging. When the voltage of the cell C21 becomes equal to the voltages of the other cells C22 to C26, the transistor TR21 is turned off and the discharge of the cell C21 is stopped.

  On the other hand, for example, when a disconnection occurs at a point F between the connection point of the adjacent cells C21 and C22 and the cell short circuit S2, all voltages of the cells C21 and C22 connected in series are Applied between the corresponding input terminals of S2. Here, the microcomputer CPU22 temporarily turns on the transistor TR21 via the OR circuit OR21, and short-circuits between the input terminals connected to the cell C21 via the resistor R21. By short-circuiting between the input terminals to which the cell C21 is connected, the input impedance between the input terminals becomes smaller than when the transistor TR21 is in the OFF state. The voltage at the connection point of the cells C21 and C22 is set optimally for the input impedance between the input terminals before and after the short circuit of the cell short circuit S2, so that the voltage between the input terminals of the cell C21 is smaller than the short circuit voltage threshold. The voltage between the input terminals of the cell C22 can be higher than the short-circuit voltage threshold.

  The voltages at the connection points of the cells C21 to C26 are compared with the reference voltage output from the group voltage dividing circuit 20 by the comparators CP21 to CP26. Since the voltage at the connection point of the cells C21 and C22 is smaller than the short-circuit voltage threshold of the cell C21, the logic circuit 21 turns off the transistor TR21 based on the determination result, and the short circuit between the input terminals connected to the cell C21 is opened. The Further, since the voltage at the connection point of the cells C21 and C22 is larger than the short-circuit voltage threshold value of the cell C22, the logic circuit 21 turns on the transistor TR22 based on the determination result, and the input connected to the cell C22 via the resistor R22. Short-circuit between terminals. Thereafter, the cell short circuit S2 alternately and repeatedly shorts the input terminals connected to the adjacent cells C21 and C22.

  Outputs corresponding to the transistors TR21 and TR22 of the logic circuit 21 are input to the microcomputer CPU22. When the output corresponding to the transistors TR21 and TR22 of the logic circuit 21 alternately repeats the high level / low level, the microcomputer CPU22 is connected between the connection point between the adjacent cells C21 and C22 and the cell short circuit S2. It is determined that a disconnection has occurred, and data relating to the disconnection location is output to the assembled battery controller 12. Similarly, it is possible to detect a disconnection occurring between a connection point of adjacent cells and a cell short circuit corresponding to those cells among C22 to C26 by specifying the disconnection point.

  Finally, specific effects will be described. According to the present embodiment, the charge state control device CEU2 is configured such that the cell short circuit S2 connected to the adjacent cells C21 and C22 is alternately and repeatedly short-circuited, so that the cell C21 and C22 and the cell short circuit S2 are connected. The occurrence location of disconnection can be specified. Therefore, the reliability of the charge state detection device CEU2 and the charge state detection devices CEU1 and CEU3 to CUn having the same circuit configuration can be improved.

  When detecting disconnection, it is not necessary to short-circuit all the cells. By short-circuiting every other adjacent cell, all disconnections between the cell and the cell short circuit can be detected. In addition, the cells may be short-circuited sequentially or simultaneously.

(Seventh embodiment)
The charge state control device in the seventh embodiment has substantially the same configuration as the charge state control device in the sixth embodiment, and will be described with reference to FIG. 10 in the sixth embodiment. Here, the disconnection detection operation which is a different part from the charge condition control apparatus in 6th Embodiment is demonstrated, and description except a required part is abbreviate | omitted about a common part.

  Next, a specific operation will be described with reference to FIG. As shown in FIG. 10, for example, when a disconnection occurs at a point F between the connection point of the adjacent cells C21 and C22 and the cell short circuit S2, the total voltage of the cells C21 and C22 connected in series is Applied between the corresponding input terminals of the cell short circuit S2. Here, the microcomputer CPU22 turns on the transistor TR21 for a predetermined time through the OR circuit OR21, and short-circuits between the input terminals connected to the cell C21 through the resistor R21. By short-circuiting between the input terminals to which the cell C21 is connected, the input impedance between the input terminals becomes smaller than when the transistor TR21 is in the OFF state. The voltage at the connection point of the cells C21 and C22 is set optimally for the input impedance between the input terminals before and after the short circuit of the cell short circuit S2, so that the voltage between the input terminals of the cell C21 is smaller than the short circuit voltage threshold. The voltage between the input terminals of the cell C22 can be higher than the short-circuit voltage threshold.

  The voltages at the connection points of the cells C21 to C26 are compared with the reference voltage output from the group voltage dividing circuit 20 by the comparators CP21 to CP26. Since the voltage at the connection point of the cells C21 and C22 is smaller than the short-circuit voltage threshold value of the cell C21, the logic circuit 21 tries to turn off the transistor TR21 based on the determination result. However, the microcomputer CPU22 turns on the transistor TR21 via the OR circuit OR21 and continues the short circuit between the input terminals connected to the cell C21. Since the voltage at the connection point of the cells C21 and C22 is larger than the short-circuit voltage threshold value of the cell C22, the logic circuit 21 turns on the transistor TR22 based on the determination result, and the input terminal to which the cell C22 is connected via the resistor R22. Short-circuit between them. When the cells C21 and C22 are short-circuited together, the input impedance between the input terminals to which the cells C21 and C22 are connected becomes substantially equal. Therefore, the voltage at the connection point of the cells C21 and C22 becomes smaller than the short-circuit voltage threshold value of the cell C22, and the logic circuit 21 turns off the transistor TR22 based on the determination result and short-circuits between the input terminals connected to the cell C22. Is released. Thereafter, the cell short circuit S2 repeatedly shorts the input terminals connected to the cell C22 while the input terminals connected to the cell C21 are short-circuited.

  Outputs corresponding to the transistors TR21 and TR22 of the logic circuit 21 are input to the microcomputer CPU22. When the output corresponding to the transistor TR21 of the logic circuit 21 is alternately at the high level and the output corresponding to the transistor TR22 of the logic circuit 21 is alternately repeating the high level / low level, the microcomputer CPU22 repeats the adjacent cell C21, It is determined that a disconnection has occurred between the connection point of C22 and the cell short circuit S2. When the microcomputer CPU 22 determines that a disconnection has occurred, the microcomputer CPU 22 outputs data relating to the disconnection point to the assembled battery controller 12. Similarly, it is possible to detect a disconnection occurring between a connection point of adjacent cells and a cell short circuit corresponding to those cells among C22 to C26 by specifying the disconnection point.

  Finally, specific effects will be described. According to the present embodiment, the state-of-charge control device CEU2 is configured such that the cell short circuit S2 connected to the adjacent cells C21 and C22 repeatedly shorts one of the input terminals, so that the cells C21 and C22 and the cell short circuit S2 are connected. It is possible to identify the occurrence location of disconnection between the two. Therefore, the reliability of the charge state detection device CEU2 and the charge state detection devices CEU1 and CEU3 to CUn having the same circuit configuration can be improved.

  When detecting disconnection, it is not necessary to short-circuit all the cells. By short-circuiting every other adjacent cell, all disconnections between the cell and the cell short circuit can be detected. In addition, the cells may be short-circuited sequentially or simultaneously.

  In the above embodiment, when the transistors TR21 and TR22 are in the on state, the input impedance between the input terminals to which the cells C21 and C22 are connected is set to be different from each other. The transistor TR22 can be fixed to the on state while the transistor TR21 is on. As a result, the microcomputer CPU 22 can more easily determine the disconnection.

The block diagram of the assembled battery system using a charge condition control apparatus is shown. The circuit diagram of the charge condition control apparatus in 1st Embodiment is shown. The circuit diagram of another cell short circuit is shown. The circuit diagram of the charge condition control apparatus in 2nd Embodiment is shown. The circuit diagram of the charge condition control apparatus in 3rd Embodiment is shown. The circuit diagram of another cell short circuit is shown. The circuit diagram of another overcharge / discharge detection circuit is shown. The circuit diagram of the charge condition control apparatus in 4th Embodiment is shown. The circuit diagram of the charge condition control apparatus in 5th Embodiment is shown. The circuit diagram of the charge condition control apparatus in 6th Embodiment is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... assembled battery system, 10 ... assembled battery, CG1-CGn ... cell group, C11-C16, C21-C26 ... cell, CEU1-CEUn ... charge state control device (assembled battery charging State control device), S11 to S16 ... cell short circuit (short circuit), 110, 120 ... cell voltage divider, 110a, 110b, 120a, 120b ... resistor, 111, 121 ... short circuit Reference voltage circuit for determination, CP11, CP12... Comparator, TR11, TR12... Transistor, R11, R12... Short circuit resistance, CPU10... Microcomputer (disconnection detection circuit), 112. S2 ... Cell short circuit (short circuit), 20 ... Group voltage divider, CP21 to CP25 ... Comparator, 21 ... Logic times , TR21 to TR26 ... transistor, R21 to R26 ... short-circuit resistance, CPU20 ... microcomputer (disconnection detection circuit), UL11-UL16, UL21-UL26 ... overcharge / discharge detection circuit (abnormality detection circuit) 113, 123, 213, 223 ... cell voltage dividing circuit, 113a, 113b, 123a, 123b ... resistance, 114, 124 ... reference voltage circuit for overcharge determination, 115, 125 ... over Reference voltage circuit for discharge determination, CPU11, CPU21 ... microcomputer (disconnection detection circuit), 116 ... resistor, OR11, OR12, OR21-OR26 ... OR circuit, CPU12, CPU22 ... microcomputer (disconnection) Detection circuit), 11 ... current sensor, 12 ... assembled battery controller, 2 ... high Lid electric car controller (HEV controller), 3 ... inverter, 4 ... motor

Claims (15)

In an assembled battery charge state control device comprising a short circuit that is connected to a plurality of cells connected in series constituting the assembled battery and short-circuits the cell based on the voltage of the cell.
The short circuit is different in input impedance before a short circuit between input terminals to which the cells are connected for each of the adjacent cells, and the adjacent cells and the short circuit connected to the adjacent cells When a disconnection occurs between all the voltages of adjacent cells, the voltage is divided by the input impedance of the connected short circuit, and between the input terminals of the connected short circuit is different from that before disconnection. Is applied, the short circuit state of the connected short circuit is changed, and the short circuit state is changed, so that the voltage applied between the input terminals of the connected short circuit further changes. Te, short-circuited state of the connected had the short circuit further changes, since, a state change is repeated, the said cell based on the operating state of the short circuit in the state Assembled battery charge state control apparatus characterized by having a disconnection detection circuit for detecting the disconnection between the fault circuit.   2. The assembled battery charge state control device according to claim 1, wherein the short circuit has a resistance having a different resistance value between the input terminals connected to the cells for each of the adjacent cells. The short circuit shorts the cell when the voltage of the cell is greater than a short circuit voltage threshold,
The disconnection detection circuit determines that a disconnection has occurred between a connection point between adjacent cells and the short circuit when the short circuit alternately and repeatedly shorts adjacent cells. The assembled battery charge state control device according to claim 1 or 2. A short circuit for short-circuiting the cells based on the voltage of the cells connected to a plurality of cells connected in series constituting the assembled battery, and a voltage of the cells connected to the plurality of cells connected in series constituting the assembled battery In an assembled battery charge state control device comprising an abnormality detection circuit for detecting an abnormality of the cell based on
The short circuit and the abnormality detection circuit are different in the combined input impedance before the short circuit between the input terminals to which the cells are connected for each of the adjacent cells, and are connected to the adjacent cells and the adjacent cells. When a disconnection occurs between the short circuit and the abnormality detection circuit, all voltages of the adjacent cells are divided by the combined input impedance of the connected short circuit and the abnormality detection circuit, and connected. A voltage having a magnitude different from that before disconnection is applied between the input terminals of the short circuit and the abnormality detection circuit, and the short circuit state of the connected short circuit is changed and the short circuit state is changed. Therefore, the voltage applied between the input terminals of the short circuit and the abnormality detection circuit that are connected further changes, and the short circuit state of the connected short circuit is To change, since the change is a state repeated, have a disconnection detection circuit for detecting the disconnection between the short circuit and the abnormality detection circuit and the cell on the basis of an output of the abnormality detection circuit in the state A battery pack state-of-charge control device characterized by the above.   5. The assembled battery charge state control device according to claim 4, wherein the short circuit has a resistance having a different resistance value between input terminals connected to the cell for each of the adjacent cells.   The assembled battery charge state control device according to claim 4, wherein the abnormality detection circuit includes a resistance having a different resistance value between adjacent input cells for each of the adjacent cells. The short circuit shorts the cell when the voltage of the cell is greater than a short circuit voltage threshold,
The abnormality detection circuit detects the overcharge state of the cell by comparing the voltage of the cell with an overcharge voltage threshold,
The disconnection detection circuit determines that a disconnection has occurred between the cell, the short circuit, and the abnormality detection circuit when the abnormality detection circuit repeatedly detects an overcharge state of the cell. The assembled battery charge state control device according to claim 4. The short circuit shorts the cell when the voltage of the cell is greater than a short circuit voltage threshold,
The abnormality detection circuit detects an overdischarge state of the cell by comparing the voltage of the cell with an overdischarge voltage threshold,
The disconnection detection circuit determines that a disconnection has occurred between the cell, the short circuit, and the abnormality detection circuit when the abnormality detection circuit repeatedly detects an overdischarge state of the cell. The assembled battery charge state control device according to claim 4. The short circuit shorts the cell when the voltage of the cell is greater than a short circuit voltage threshold,
The abnormality detection circuit is
Detecting the overcharge state and overdischarge state of the cell by comparing the cell voltage with an overcharge voltage threshold and an overdischarge voltage threshold;
The disconnection detection circuit is configured such that when the abnormality detection circuit connected to the adjacent cells alternately detects an overcharge state and an overdischarge state alternately, the connection point between the adjacent cells, the short circuit, and the 7. The assembled battery charge state control device according to claim 4, wherein it is determined that a disconnection has occurred with the abnormality detection circuit. In an assembled battery charge state control device comprising a short circuit that is connected to a plurality of cells connected in series constituting the assembled battery and short-circuits the cell based on the voltage of the cell.
Furthermore, when one of the adjacent cells is short-circuited by the short circuit, and a disconnection occurs between the adjacent cell and the short circuit connected to the adjacent cell, the total voltage of the adjacent cell is The voltage is divided by the input impedance of the connected short circuit, and a voltage of a magnitude different from that before the short circuit is applied between the input terminals of the connected short circuit by short-circuiting one of the adjacent cells. The short-circuit state of the connected short circuit has changed, and the short-circuit state has changed, so that the voltage applied between the input terminals of the connected short circuit has further changed and is connected. short-circuit state of the short circuit further changes were, later, a state change is repeated, in the state, the short times and the cell based on the operating state of the short circuit after the short Assembled battery charge state control apparatus characterized by having a disconnection detection circuit for detecting the disconnection between.   The assembled battery charge state control device according to claim 10, wherein the disconnection detection circuit short-circuits the plurality of cells every other one of the short circuits.   The assembled battery charge state control device according to claim 11, wherein the disconnection detection circuit sequentially short-circuits the plurality of cells by the short circuit.   The assembled battery charge state control device according to claim 11, wherein the disconnection detection circuit simultaneously short-circuits the plurality of cells with the short circuit. The short circuit shorts the cell when the voltage of the cell is greater than a short circuit voltage threshold,
In the disconnection detection circuit, when the short circuit connected to the adjacent cell repeatedly short-circuits adjacent cells alternately, a disconnection occurs between the connection points of the adjacent cells and the short circuit. The assembled battery charge state control device according to claim 11, wherein it is determined that the battery pack is in a charged state.   15. The assembled battery charge state control device according to claim 1, wherein the state of charge of the assembled battery mounted on the vehicle is controlled.

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