JP3586285B2 - Battery charge / discharge device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a battery charging / discharging device for charging and / or discharging a battery.
[0002]
[Prior art]
A conventional battery charger supplies a voltage and a current to a battery to charge the battery.
[0003]
A conventional battery discharge device performs a predetermined discharge with a set current to lower the terminal voltage of the battery.
[0004]
[Problems to be solved by the invention]
The conventional battery charger has the following problems.
1. It is not possible to grasp how much the actually supplied voltage value and current value are different from the manufacturing specifications, and it is not possible to thoroughly perform quality control in manufacturing.
2. Since there is no self-diagnosis function and a function of automatically shutting off power supply to an abnormal channel, safety in manufacturing cannot be ensured.
3. When an error occurs, there is no function to notify the external computer of the details of the error (the channel where the error occurred, the voltage value and current value at that time, etc.). is there.
[0005]
The conventional battery discharge device has the following problems.
1. It is not possible to grasp how much the actually discharged current value has an error with respect to the manufacturing specifications, and it is not possible to thoroughly perform quality control in manufacturing.
2. Since there is no self-diagnosis function and a function of automatically shutting off the current input of the abnormal channel, safety in manufacturing cannot be ensured.
3. Since there is no function of notifying the external computer of the contents of the abnormality (the channel in which the abnormality occurred and the current value at that time) when the abnormality occurred, there is a risk that the abnormality processing is delayed and a large number of defective products are produced.
[0008]
A first object of the present invention is to provide a battery charging / discharging device capable of determining the quality of a battery with high reliability and high accuracy and ensuring safety.
[0009]
A second object of the present invention is to provide a battery charge / discharge device capable of shortening maintenance and repair time.
[0014]
[Means for Solving the Problems]
The battery charge and discharge device of the present invention is a non-defective lithium secondary battery,Charge / discharge timeStorage means for storing voltage and current data at the time of charge and discharge, and voltage and current data at the time of charge and discharge of each of the plurality of lithium secondary batteries are monitored, and from the start to the end of charge and discharge, the storage means Memorable goodRechargeable lithium batteryVoltage and current data during charging and dischargingCompared in a preset time unit and comparedIt is characterized by comprising monitoring means for repeatedly calculating the difference, and control means for stopping charging and discharging of the lithium secondary battery in which the difference obtained by the monitoring means exceeds a predetermined range.
[0015]
The monitoring means is for the lithium secondary battery.Voltage and current data during charging and dischargingCan be monitored to detect an abnormality, and the details of the abnormality detected by the monitoring means can be reported to an external computer.
[0016]
Voltage and current data during charging and dischargingBut,Voltage and current data during chargingandDischarge voltage and current dataAt least one of the following.
[0017]
The lithium secondary battery can be configured to start being charged at a constant current by the initially set current, and then to be charged by a current that gradually decreases as the terminal voltage of the lithium secondary battery increases.
[0020]
[Action]
In the battery charging / discharging device of the present invention, voltage and current data at the time of charging / discharging of a plurality of lithium secondary batteries are monitored, and stored from the start to the end of charging / discharging of a good product.Rechargeable lithium batteryVoltage and current data during charging and dischargingCompared in a preset time unit and comparedThe difference is repeatedly obtained, and the suspension of charging and discharging of the lithium secondary battery in which the obtained difference exceeds a predetermined range is controlled. Therefore, the quality of the battery can be determined with high reliability and high accuracy, and the safety of the charging / discharging device can be ensured.
[0026]
【Example】
FIG. 1 shows the configuration of an embodiment of the battery charger of the present invention. This embodiment relates to charging of a Li (lithium) secondary battery. The external computer 2 and the charging device 4 are connected via communication paths 6 and 8. The external computer 2 sets charging conditions such as voltage, current, and time to the charging device 4 via the communication path 6 and transmits a control command.
[0027]
The charging condition set by the external computer 2, that is, the charging characteristic curve is, for example, as shown in FIG. 3, the constant current charging is performed by the initially set current, and the current is changed with the rise of the terminal voltage of the battery. It is to decrease. The external computer 2 can set various charging conditions other than the example shown in FIG. 3, for example, as shown in FIG. FIG. 5A shows an example in which the current is gradually supplied to slowly activate the battery, and FIG. 5B shows an example in which the battery is gradually charged at the initial stage and charged rapidly in the middle. (C) is an example of rapidly charging from the beginning.
[0028]
The external computer 2 also monitors the operation status (voltage, current, time, etc.) sent from the charging device 4 via the communication path 8 and the content of the abnormality (the channel in which the abnormality occurred and the voltage value and current at that time). In addition to receiving the data indicating the values, the operation status and the details of the abnormality are displayed, and the measurement data such as the voltage value and the current value transmitted from the charging device 4 via the communication path 8 is totaled.
[0029]
The charging device 4 includes a main power supply unit (not shown in FIG. 1), a CPU unit 10, and eight voltage / current control units VC1 to VC8. The main power supply unit includes a main power supply for charging, a power supply for analog circuits, a power supply for digital circuits, and a power supply for external input / output.
[0030]
The CPU 10 communicates with the external computer 2 via the communication paths 6 and 8.Communication unit 12When,CPU14When,CPU14A memory 15 for storing data required for performing the calculation, for example, charging characteristic data of a good battery and a calculation result as shown in FIG. 4, an external input / output interface 16 and an internal bus interface 18, It consists of.
[0031]
The CPU 10 sets charging voltages and currents in the voltage / current controllers VC1 to VC8 based on an instruction from the external computer 2, and determines whether or not the voltage / current controllers VC1 to VC8 are operating normally, ie, charging. It has a function of monitoring the voltage, current and time, measuring the terminal voltage of the battery, and immediately cutting off the power supply to the corresponding channel when an abnormality occurs, and reporting the contents of the abnormality to the external computer 2. Also,CPU unit 10Has a function of controlling an actuator for connecting a battery and a charging device during charging. The CPU unit 10 sets the charging voltage and current, monitors the charging voltage, current and time, and monitors the terminal of the battery, based on an operation of a switch provided on the CPU unit 10 based on an instruction from the external computer 2 and not based on an instruction from the external computer 2. It has a function to measure the voltage and immediately cut off the power supply to the corresponding channel when an abnormality occurs.
[0032]
The voltage / current control units VC1 to VC8 control the charging current and the voltage according to the instruction of the CPU unit 10. The voltage / current control unit VC1 includes a charging unit C1 having a voltage / current control circuit of 32 channels to which one battery is connected, and an I / O connected to the CPU unit 10 via the internal buses 20 and 22. And a unit. The I / O unit includes a voltage / current setting D / A converter S1 in which a charging voltage and a current are set from the CPU unit 10 via the internal bus 20, and a charging voltage and a current and a battery terminal voltage. And an A / D converter M1 for measuring voltage / current. The voltage and current value actually supplied to the battery are notified from the A / D converter M1 to the CPU unit 10 via the internal bus 22. The charging voltage and current for 32 batteries are set in the D / A converter for voltage / current setting S1, and the charging voltage and current for 32 batteries are set in the A / D converter for voltage / current measurement M1. And a circuit for measuring the terminal voltage of the battery. The voltage / current control units VC2 to VC8 have the same configuration as the voltage / current control unit VC1.
[0033]
The number of charging devices 4 can be increased by expanding the communication unit of the external computer 2.
[0034]
FIG. 2 shows an operation example of the CPU section 10 of the embodiment of FIG. First, the CPU unit 10 sets the voltage and current values initially set by the switches in the D / A converters S1 to S8 of the voltage / current control units VC1 to VC8 (step S1). Next, the CPU unit 10 checks the accuracy of the voltage and current values set in step S1 (step S2). If the accuracy is not sufficient (NO in step S3), the CPU 10 performs an abnormal process in step S4. The abnormality processing is a notification to the external computer 2 of the cutoff of power supply to the corresponding channel and the abnormal channel number. If the accuracy is sufficient (YES in step S3), the CPU unit 10 sends a ready signal to the external computer 2 (step S5).
[0035]
When the external computer 2 receives the ready signal, the external computer 2 sends setting data of charging conditions such as voltage, current, and time to the charging device 4 to the CPU 10 via the communication path 6. The data is transmitted to the voltage / current setting D / A converters S1 to S8 of the voltage / current controllers VC1 to VC8 via the internal bus 20. The charging units C1 to C8 of the voltage / current control units VC1 to VC8 perform charging according to the data set in the D / A converters S1 to S8.
[0036]
Next, the CPU unit 10 measures (monitors) the charging voltage and the charging current, measures the terminal voltage of the battery, and determines the quality of the battery based on these measurements (step S6).
[0037]
First, a description will be given of the quality judgment of the battery being charged. The CPU unit 10 constantly monitors the charging voltage and current via the voltage / current measuring A / D converters M1 to M8 and the internal bus 22. As shown in (2), the charging voltage and current characteristics of non-defective products stored in advance in the memory 15 are compared in a set time unit, and if the difference exceeds a predetermined value, it is determined that the battery is defective (step S7). NO). Then, the power supply is cut off only for the channel of the battery determined to be defective (step S8). As described above, the safety can be ensured by immediately stopping charging the defective product without affecting the manufacture of other batteries.)
[0038]
Further, the CPU 10 communicates with the external computer 2 after the voltage / current measurement or the abnormality processing (step S9). The communication contents are the measurement results of charging voltage and current, the elapsed time status, the status report at the time of abnormality, and the notification of the abnormal channel number.
[0039]
Next, measurement of the terminal voltage of the battery will be described. The final charging voltage is one item of good / bad determination of the battery, and its measurement accuracy is important for ensuring quality. In the embodiment of FIG. 1, as described above, a high-precision A / D converter is provided for each channel, that is, for each battery, so that it can be used as a high-precision voltage measuring device. FIG. 6 shows a configuration example of a battery terminal voltage measurement circuit incorporated in the embodiment of FIG. A transistor 64 is provided between the charging main power supply 62 and the battery 68, and a voltage / current measuring A / D converter 66 is connected to both ends of the battery 68. In order to realize highly accurate terminal voltage measurement, the transistor 64 that is turned on during charging is cut off, and the output digital value of the A / D converter 66 is read. As a result, the terminal voltage of the battery can be accurately measured.
[0040]
When the measured terminal voltage of the battery is out of the predetermined range (NO in step S7), it is determined that the battery is abnormal (step S8), and the details of the abnormality and the abnormal channel number are reported to the external computer 2 (step S9). .
[0041]
In the circuit of FIG. 6, transistors are used to stop power supply, but other various switching elements can be used.
[0042]
FIG. 7 shows the configuration of an embodiment of the battery discharge device of the present invention. This example relates to discharging of a Li (lithium) secondary battery. The external computer 2 and the discharge device 4D are connected via communication paths 6 and 8. The external computer 2 sets discharge conditions such as current and time for the discharge device 4D via the communication path 6, and transmits a control command.
[0043]
The discharge condition, that is, the discharge characteristic curve set by the external computer 2 is, for example, as shown in FIG. 9, a constant current discharge with a predetermined current I to decrease the terminal voltage of the battery (note that FIG. In the case of a Li secondary battery, if it is completely discharged, the function of the battery will be deteriorated. The external computer 2 can set various discharge conditions other than the example shown in FIG. 9, for example, as shown in FIG. FIG. 11A is an example in which the discharge current I is initially increased and gradually reduced, and FIG. 11B is an example in which the discharge current I is initially reduced and gradually increased.
[0044]
The external computer 2 also monitors the operation status (current and time, etc.) sent from the discharge device 4D via the communication path 8 and the content of the abnormality (the channel in which the abnormality occurred, the current value and time at that time, etc.). Is displayed, the operating status and the details of the abnormality are displayed, and the measurement data such as the current value sent from the discharge device 4D via the communication path 8 is totaled.
[0045]
The discharge device 4D includes a main power supply (not shown in FIG. 7),CPU unit 10D, And eight current control units CC1 to CC8. The main power supply unit includes a power supply for an analog circuit, a power supply for a digital circuit, and an external input / output power supply.
[0046]
The CPU 10D communicates with the external computer 2 via 6 and 8.Communication unit 12DCPU 14D, a memory 15D for storing data necessary for the CPU 14D to perform an operation, for example, discharge characteristic data of a non-defective battery as shown in FIG. 10 and an operation result, and an external input / output interface 16D And an internal bus interface 18D.
[0047]
The CPU unit 10D sets a discharge current in the current control units CC1 to CC8 based on an instruction from the external computer 2, and monitors whether the current control units CC1 to CC8 are operating normally, that is, monitors the discharge current and time. , The terminal voltage of the battery is measured, and when an abnormality occurs, the discharge of the corresponding channel is immediately stopped, and the abnormality content is reported to the external computer 2. The CPU unit 10D also has a function of controlling an actuator for connecting the battery and the discharge device. The CPU unit 10D sets the discharge current, monitors the discharge current and time, and measures the terminal voltage of the battery according to the operation of the switch provided on the CPU unit 10D, not based on the instruction from the external computer 2. When an abnormality occurs, a function of immediately stopping the discharge of the corresponding channel is provided.
[0048]
The current control units CC1 to CC8 control the charging current in accordance with instructions from the CPU unit 10D. The current control unit CC1 includes a discharge unit D1 having a current control circuit of 32 channels to which one battery is connected, and an I / O unit connected to the CPU unit 10D and the internal buses 20D and 22D. Have been. The I / O unit includes a current setting D / A converter SD1 for setting a discharge current from the CPU unit 10D via the internal bus 20D, and a voltage / current measurement for measuring a discharge current and a terminal voltage of a battery. And an A / D converter MD1. The value of the current actually flowing out of the battery is notified from the A / D converter MD1 to the CPU unit 10 via the internal bus 22D. The current setting D / A converter SD1 is set with 32 discharge currents, and the voltage / current measurement A / D converter MD1 is set with 32 battery discharge currents and battery terminal voltages. Includes circuitry for measuring. The current control units CC2 to CC8 have the same configuration as the current control unit CC1.
[0049]
Note that the number of discharge devices 4D can be increased by expanding the communication unit of the external computer 2.
[0050]
FIG. 8 shows an operation example of the CPU unit 10D of the embodiment of FIG. First, the CPU unit 10D sets the current values initially set by the switches in the D / A converters SD1 to SD8 of the current control units CC1 to CC8 (step S11). Next, the CPU unit 10D checks the accuracy of the current value set in step S11 (step S12). If the accuracy is not sufficient (NO in step S13), the CPU 10D performs an abnormal process in step S14. The abnormal processing is to stop the discharge of the corresponding channel and report the abnormal channel number to the external computer 2. If the accuracy is sufficient (YES in step S13), CPU unit 10D sends a ready signal to external computer 2 (step S15).
[0051]
When the external computer 2 receives the ready signal, the external computer 2 sends the setting data of the discharge condition such as current and time to the discharging device 4D to the CPU 10D via the communication path 6, and the CPU 10D transmits the setting data. Are transmitted to the current setting D / A converters SD1 to SD8 of the current controllers CC1 to CC8 via the internal bus 20D. The discharge units D1 to D8 of the current control units CC1 to CC8 perform discharge in accordance with data set in the D / A converters SD1 to SD8.
[0052]
Next, the CPU section 10D measures (monitors) the discharge current, measures the terminal voltage of the battery, and determines the quality of the battery based on these measurements (step S16).
[0053]
First, a description will be given from the determination of the quality of the battery being discharged. The CPU unit 10D constantly monitors the discharge characteristics, that is, the terminal voltage V via the voltage / current measurement A / D converters MD1 to MD8 and the internal bus 22D. As shown in FIG. 10, the discharge characteristics of the non-defective product, that is, the terminal voltage characteristics, which are stored in the memory 15D in advance, are compared in a set time unit, and if the difference exceeds a predetermined value, it is determined to be defective ( (NO in step S17). Then, the discharge is stopped only for the channel of the battery determined to be defective (step S18). As described above, the safety of the battery can be ensured by immediately stopping the discharging of the defective product without affecting the discharging of the other batteries.
[0054]
Further, the CPU 10D performs communication with the external computer 2 after the voltage / current measurement or the abnormality processing (Step S19). The communication contents are the measurement results of the battery terminal voltage and the discharge current, the elapsed time status, the status report at the time of abnormality, and the notification of the abnormal channel number.
[0055]
Next, measurement of the terminal voltage of the battery will be described. The final discharge voltage is one item for determining whether the battery is good or defective, and its measurement accuracy is important for ensuring quality. In the embodiment of FIG. 7, as described above, since a high-precision A / D converter is provided for each channel, that is, for each battery, it can also be used as a high-precision voltage measuring device. FIG. 12 shows a configuration example of a battery terminal voltage measurement circuit incorporated in the embodiment of FIG. A switch 64D is provided between the discharging current control circuit 62D and the battery 68, and a voltage / current measuring A / D converter 66 is connected to both ends of the battery 68. To realize highly accurate terminal voltage measurement, the switch 64D that is turned on during discharging is cut off, and the output digital value of the A / D converter 66 is read. As a result, the terminal voltage of the battery can be accurately measured.
[0056]
When the measured terminal voltage of the battery is out of the predetermined range (NO in step S17), it is determined that the battery is abnormal (step S18), and the details of the abnormality and the abnormal channel number are reported to the external computer 2 (step S19). .
[0057]
The embodiment of FIG. 7 can be applied not only to a device for performing only discharge but also to a device for performing charge and discharge alternately as shown in FIG.
[0058]
FIG. 14 shows the configuration of an embodiment of the battery charge / discharge device of the present invention. The positive terminal of the main power supply 62 is connected to the positive terminal of the battery 68 via a switch SW1, a control element 72 composed of, for example, an FET, a current detection element 74 composed of, for example, a resistor, and a diode 92. A diode 91 is connected in parallel with a series circuit including the control element 72, the current detection element 74, and the diode 92. The diodes 91 and 92 are switching diodes for switching a charging current and a discharging current, and are connected in opposite polarities. The anode of the diode 91 and the cathode of the diode 92 are connected to the positive terminal of the battery 68.
[0059]
The negative terminal of the main power supply 62 is connected to the negative terminal of the battery 68. The connection point between the current detection element 74 and the anode of the diode 92 is connected to the negative terminal of the battery 68 via the switch SW2. The CPU 100 outputs a connection command and a non-connection command to the switches SW1 and SW2. The connection command or the non-connection command output from the CPU 100 is directly supplied to the switch SW2, and is also supplied to the switch SW1 via the inverter 76. Supplied. That is, one of the switches SW1 and SW2 is turned on and the other is turned off.
[0060]
More specifically, at the time of charging, the switch SW2 is turned off (disconnected state) by a disconnection command output from the CPU 100, and the switch SW1 is turned on and off by the inverter 76 by the disconnection command output from the CPU 100. It is inverted and supplied as a connection command, and is turned on (connection state). At the time of discharging, the switch SW2 is turned on (connected state) by a connection command output from the CPU 100, and the switch SW1 is supplied as a disconnection command by inverting the connection command output from the CPU 100 by the inverter 76, It is turned off (disconnected state).
[0061]
CPU 100 sets main power supply 62 to the minimum voltage value required for charging. That is, the CPU 100 determines that the voltage drop of the control element 72 is V1, the voltage drop of the current detection element 74 is V2, the voltage drop of the diode 92 is V3, and the charging voltage of the battery 68 is V._BThen, the main power supply 62 is set to the voltage V represented by the following (Equation 1).
[0062]
V = V1 + V2 + V3 + V_B                      ... (Equation 1)
[0063]
The CPU 100 supplies the set voltage value to the voltage setting D / A converter 78 via the internal bus 102. The D / A converter 78 converts the set voltage value into an analog signal and supplies the analog signal to one input terminal of the comparator 80. The CPU 100 supplies the set current value to the current setting D / A converter 81 via the internal bus 102. The D / A converter 81 converts the set current value into an analog signal and supplies the analog signal to one input terminal of the comparator 82.
[0064]
The terminal voltage of the battery 68 is supplied to the other input terminal of the comparator 80 via the amplifier 84. The comparator 80 supplies the difference voltage between the two input terminals to the control element 72. The terminal voltage of the current detecting element 74 is supplied to the other input terminal of the comparator 82 via the amplifier 86. The comparator 82 supplies a difference voltage between both input terminals to the control element 72.
[0065]
The output voltages of the amplifiers 84 and 86 are supplied to the CPU 100 as digital values via the voltage / current setting monitor A / D converter 88 and the internal bus 102.
[0066]
In the embodiment of the battery charge / discharge device of FIG. 14 configured as described above, at the time of charging, the switch SW1 is turned on and the switch SW2 is turned off in response to the disconnection command corresponding to the charging command output from the CPU 100. State. Accordingly, power is supplied from the positive terminal of the main power supply 62 to the positive terminal of the battery 68 via the switch SW1, the control element 72, the current detecting element 74, and the diode 92.
[0067]
At the time of discharging, the switch SW1 is turned off and the switch SW2 is turned on in response to a connection command corresponding to the discharge command output from the CPU 100. Therefore, the discharge current discharged from the positive terminal of the battery 68 flows into the negative terminal of the battery 68 via the diode 91, the control element 72, the current detecting element 74, and the switch SW2.
[0068]
FIG. 15 shows the configuration of another embodiment of the battery charge / discharge device of the present invention. In this example, n (n is a positive integer) batteries are charged. The charge / discharge device 200 includes voltage / current control units VIC1 to VICn corresponding to the n batteries B1 to Bn, respectively. The voltage / current control units VIC1 to VICn are respectively a switch SW1, an inverter 76, a control element 72, a voltage setting D / A converter 78, a comparator 80, a current setting D / A converter 81, an amplifier 84, and a switch SW1 in FIG. 86, an A / D converter 88 for setting a voltage / current monitor, and components corresponding to the switch SW2.
[0069]
The CPU 100 of the battery charging / discharging device 200 sets the charging main power supply 62 to the minimum voltage value required for charging in association with each of the n batteries B1 to Bn in order to minimize the amount of heat generated during charging. Set to. Further, the CPU 100 supplies the voltage set value and the current set value to the voltage / current control units VIC1 to VICn, and controls power supply to the batteries B1 to Bn.
[0070]
At the time of charging, the CPU 100 gives a charging command to the voltage / current control units VIC1 to VICn. Thus, the voltage / current control units VIC1 to VICn act as charging voltage / current control circuits, and charge the batteries B1 to Bn.
[0071]
At the time of discharging, the CPU 100 gives a discharge command to the voltage / current control units VIC1 to VICn. As a result, the voltage / current control units VIC1 to VICn operate as discharge voltage / current control circuits, and the batteries B1 to Bn discharge.
[0072]
【The invention's effect】
According to the battery charge / discharge device of the present invention, the voltage and current data at the time of charge / discharge of each of the plurality of lithium secondary batteries is monitored, and the quality of the non-defective products stored from the start to the end of charge / discharge is monitored.Rechargeable lithium batteryVoltage and current data during charging and dischargingCompared in a preset time unit and comparedThe difference is repeatedly obtained, and the stop of charging / discharging of the lithium secondary battery in which the obtained difference exceeds a predetermined range is controlled, so that it is possible to determine whether the battery is good or not with high reliability and high accuracy. And the safety of the charging / discharging device can be ensured. In addition, the abnormality processing can be performed quickly, and the maintenance and repair time of the charge / discharge device can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an embodiment of a battery charger of the present invention.
FIG. 2 is a flowchart illustrating an operation example of a CPU unit 10 of the embodiment of FIG.
FIG. 3 is a characteristic diagram showing an example of charging characteristics of a lithium secondary battery to be charged in the embodiment of FIG.
FIG. 4 is a characteristic diagram showing a comparison between a previously stored non-defective charging characteristic and an actual battery charging characteristic.
FIG. 5 is a characteristic diagram showing various charging characteristics applicable to the embodiment of FIG. 1;
FIG. 6 is a circuit diagram showing one configuration example of a terminal voltage measuring circuit of the battery of the embodiment of FIG. 1;
FIG. 7 is a block diagram showing a configuration of an embodiment of the battery discharge device of the present invention.
FIG. 8 is a flowchart illustrating an operation example of a CPU unit 10D of the embodiment in FIG. 7;
9 is a characteristic diagram showing an example of a discharge characteristic of a lithium secondary battery to be discharged in the embodiment of FIG.
FIG. 10 is a characteristic diagram showing a comparison between the discharge characteristics of a non-defective product stored in advance and the discharge characteristics of an actual battery.
FIG. 11 is a characteristic diagram showing various discharge characteristics applicable to the embodiment of FIG. 7;
12 is a circuit diagram showing one configuration example of a terminal voltage measuring circuit of the battery of the embodiment in FIG. 7;
FIG. 13 is a characteristic diagram showing an example in which charging is performed by alternately performing charging and discharging.
FIG. 14 is a block diagram showing the configuration of an embodiment of the battery charge / discharge device of the present invention.
FIG. 15 is a block diagram showing the configuration of another embodiment of the battery charge / discharge device of the present invention.
[Explanation of symbols]
2 External computer
4 Charging device
6,8 Communication channel
10 CPU section
12 Communication unit
14 CPU
15 Memory
16 I / O interface
18 Internal bus interface
VC1 to VC8 voltage / current control unit
S1 to S8 Voltage / current setting D / A converter
M1 to M8 A / D converter for voltage / current measurement
C1 to C8 charging unit
62 Main power supply for charging
64 transistors
66 A / D converter for voltage / current measurement
68 batteries
4D discharge device
10D CPU section
12D communication unit
14D CPU
15D memory
16D I / O interface
18D internal bus interface
CC1 to CC8 current control unit
SD1 to SD8 D / A converter for current setting
MD1 to MD8 A / D converter for voltage / current measurement
D1 to D8 discharge unit
62D discharge current control circuit
64D switch
72 control element
74 current detection element
76 Inverter
78 D / A converter for voltage setting
80, 82 comparator
81 D / A converter for current setting
84,86 amplifier
88 A / D converter for voltage / current monitor
91,92 Diode
100 CPU
SW1, SW2 switch

Claims (4)

At the time of charging and discharging a good lithium secondary battery, storage means for storing voltage and current data with respect to the charging and discharging time ,
The voltage and current data at the time of charging and discharging of each of the plurality of lithium secondary batteries is monitored, and during the charging and discharging of good lithium secondary batteries stored in the storage means from the start to the end of charging and discharging. Monitoring means for comparing voltage and current data with a preset time unit and repeatedly obtaining the compared difference;
A battery charging / discharging device comprising: a control unit for stopping charging / discharging of the lithium secondary battery in which the difference obtained by the monitoring unit exceeds a predetermined range. The monitoring means monitors voltage and current data during charging and discharging of the lithium secondary battery to detect an abnormality, and the content of the abnormality detected by the monitoring means is reported to an external computer. The battery charging / discharging device according to claim 1. 2. The battery charge / discharge device according to claim 1, wherein the voltage and current data at the time of charge / discharge is at least one of voltage and current data at the time of charge and voltage and current data at the time of discharge. 2. The lithium secondary battery according to claim 1, wherein the lithium secondary battery is charged with a constant current by an initially set current, and is charged by a current that gradually decreases with an increase in a terminal voltage of the lithium secondary battery. Battery charging and discharging device.

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