JP5285322B2 - Voltage equalizing device, charging device, battery assembly, and charging system - Google Patents

Description

The present invention relates to a voltage equalizing device for equalizing the voltages at both ends of each power storage device of a combined power storage device in which a plurality of single power storage devices such as capacitors and storage battery cells are connected in series, and such voltage equalization. The present invention relates to a charging device, a battery assembly , and a charging system equipped with the device.

  In recent years, assembled power storage devices (so-called battery packs) in which a plurality of single power storage devices such as capacitors and storage battery cells are connected in series have become widespread. Here, in a single power storage device that constitutes the assembled power storage device, there is a variation in the voltage at each end (voltage between the electrodes) due to the influence of leakage current, self-discharge, etc., and such a variation in the voltage at both ends is left unattended. May be overcharged or overdischarged. On the other hand, recently, assembled battery storage devices having a function of stopping charging / discharging before overdischarge or overcharge by monitoring both-end voltages of individual power storage devices have been provided. In such an assembled battery storage device, when the voltage across one of the electricity storage devices reaches the limit value for charging or discharging due to variations in the voltage across the electricity storage device, the voltage across the other electricity storage device reaches the limit value. Even if it is not, charging / discharging is stopped immediately, and as a result, the electrical energy accumulated in the entire battery pack is reduced.

In view of this, various voltage equalization apparatuses that equalize both-end voltages of each power storage device of the assembled power storage apparatus have been conventionally provided (see, for example, Patent Documents 1 to 3). In this type of voltage equalization apparatus, a voltage adjustment unit that adjusts the voltage across the storage device is provided for every storage device that constitutes the assembled storage device. The voltage across each power storage device can be adjusted to the lowest voltage across both ends by discharging by the adjustment unit, or the voltage across the storage device can be aligned to the highest voltage across both ends by charging the storage device with a relatively low voltage across the voltage. Are equalized.
JP 2002-10510 A JP 7-322515 A JP 2006-254535 A

  However, in the above conventional example, since the voltage adjustment unit that adjusts the voltage across the storage device is provided for every storage device that configures the assembled storage device, the number of storage devices that configure the assembled storage device increases. Since the number of voltage adjustment units also increases, there is a problem that the voltage equalizing device and the assembled power storage device are increased in size and cost.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a voltage equalizing device, a charging device, a battery assembly , and a charging system that can be reduced in size and cost as compared with the conventional example. is there.

  In order to achieve the above object, the invention of claim 1 is a voltage equalizing apparatus for equalizing the both-ends voltage of each power storage device of a set power storage device in which a plurality of single power storage devices are connected in series. A voltage regulator having a plurality of voltage regulators that charge or discharge a plurality of power storage devices that have a pair of terminals and are connected in series between the terminals, and a controller that controls the voltage regulators. Is connected to a connection point of power storage devices in which at least one terminal is connected in series, and between one pair of terminals, one terminal of the other one or more voltage regulators has one or more power storage devices. It is characterized by being connected with being sandwiched.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the number of power storage devices connected in series between the terminals of each voltage adjustment unit is the same in all voltage adjustment units.

According to a third aspect of the present invention, in the second aspect of the present invention, a plurality of second voltage adjusting units for charging or discharging a single power storage device having a pair of terminals and connected between the terminals, and the plurality of second voltage adjusting units. It has a second control unit for controlling the voltage adjusting unit, across the series-connected plurality of power storage device between one of the pair of terminals of the voltage regulator, to another second voltage adjusting unit each It is connected .

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the voltage adjusting unit includes a series circuit of a secondary winding of a transformer and a rectifying element connected between a pair of terminals, and is controlled. The unit is formed by applying an AC voltage to the primary winding of the transformer.

  According to a fifth aspect of the present invention, in the fourth aspect of the invention, the transformer includes one primary winding and a plurality of secondary windings having the same number of turns.

  The invention according to claim 6 is the invention according to any one of claims 1 to 3, wherein the voltage adjustment unit includes a series circuit of a resistance element and a switch element connected between a pair of terminals, and the control unit includes The switch element is controlled.

  The invention according to claim 7 is the invention according to any one of claims 1 to 3, wherein the voltage adjustment unit includes one or more capacitors and a switch element that switches a connection relationship between the capacitors and the electricity storage device. The control unit is characterized in that the electric charge is moved between the power storage device and the capacitor by performing on / off control of the switch element.

  An eighth aspect of the invention is characterized in that the voltage equalizing apparatus according to any one of the first to seventh aspects is provided to achieve the above object.

In order to achieve the above object, the invention according to claim 9 is a battery pack device in which a plurality of single power storage devices are connected in series, and the voltage of the voltage equalization device according to any one of claims 1 to 7 An adjustment unit is provided.

The invention of claim 10, in order to achieve the above object, a single storage device is connected to a plurality series, and set with a voltage adjusting unit of one of the voltage equalization device according to claim 1 to 7 It is provided with the electrical storage apparatus and the charging device which has a control part of the voltage equalization apparatus in any one of Claims 1-7.

According to the present invention, the number of voltage adjusting units for charging or discharging the power storage device can be smaller than the number of the plurality of power storage devices constituting the assembled power storage device, so that the size and cost can be reduced as compared with the conventional example. A voltage equalizing device, a charging device, a battery assembly , and a charging system can be provided.

  Hereinafter, the present invention will be described in detail by embodiments using a lithium ion battery as an electricity storage device. However, the power storage device to which the technical idea of the present invention can be applied is not limited to the lithium ion battery, and may be another storage battery such as a nickel metal hydride battery or an electric double layer capacitor.

(Embodiment 1)
The voltage equalizing apparatus A according to the present embodiment has a voltage across both terminals of a plurality (eight in the illustrated example) of power storage devices (lithium ion battery cells) SEL1 to SEL8 constituting the battery pack B as shown in FIG. A plurality of (four in the illustrated example) power storage devices SELm (m having a pair of terminals 1a and 1b and connected in series to the terminals 1a and 1b. = 1,2, ..., the voltage adjusting unit ₁ 1 to 1 ₃ of a plurality (three in the illustrated example) to charge the 8), and a control section 2 for controlling these three voltages adjuster ₁ 1 to 1 ₃ I have.

Each voltage adjusting unit 1 _k (k = 1, 2, 3) has the same configuration, and one end is connected to the rectifying diode Dk having the anode connected to one terminal 1a and the cathode of the diode Dk. And the other end is composed of secondary windings n2 _{1 to} n2 _{3 of} the transformer T connected to the other terminal 1b. These three secondary windings n2 _{1 to} n2 ₃ are wound around the same magnetic circuit (for example, iron core) (not shown) with the same number of turns.

The three voltage adjusting units 1 _k are connected to the connection point of the power storage device SELm in which at least one terminal 1 a or 1 b is connected in series, and another one to one are connected between the pair of terminals 1 a and 1 b. one terminal 1a or 1b of the plurality of voltage adjuster 1 _k are connected by interposing one or a plurality of power storage devices SELm. More specifically, the connection point of the voltage adjustment portion 1 ₁ of one of the terminals 1a are two power storage devices SEL2, the other terminal 1b is connected to the connection point of SEL3 are two power storage devices SEL6, SEL7 is connected, connected to the connection point of the voltage regulator 1 positive pole of one terminal 1a of ₂ storage device SEL1 other terminal 1b are two electric storage device is connected to a (set power storage device positive electrode B) SEL4, SEL5 is, the other terminal 1b with one terminal 1a of the voltage adjusting unit 1 ₃ is connected to two power storage devices SEL4, SEL5 connection point is connected to a negative electrode of an energy storage device SEL1 (negative electrode of the set power storage device B) , one voltage adjusting portion 1 _k of the terminals 1a, different voltage adjusting unit 1 _k of the terminal 1a with the electric storage device SEL of each equal (4) is between 1b are respectively connected, The same number (two) of power storage devices SEL are connected between 1b.

  The control unit 2 includes a primary winding n1 of the transformer T and an inverter circuit 2a that applies an AC voltage (high frequency voltage) to the primary winding n1. The inverter circuit 2a has a conventionally known circuit configuration such as a forward type as shown in FIG. 2A or a flyback type as shown in FIG. The voltage is converted into a high frequency voltage and applied to the primary winding n1 of the transformer T.

And Thus, if the inverter circuit 2a of the control unit 2 by the operation (oscillation), because the secondary winding n2 ₁ ~n2 _{3 3} one of the transformer T is wound set with the same number of turns in the same magnetic circuit the same level resulting in an induced electromotive force is three secondary windings n2 ₁ ~n2 ₃ of the voltage regulator 1 _k between terminals 1a, because DC voltage of the same level is to be applied to 1b, the respective storage between the voltage across V _SELm device SELm, so that the relation of _{V SEL1 + V SEL2 + V SEL3} + V SEL4 = V SEL3 + V SEL4 + V SEL5 + V SEL6 = V SEL5 + V SEL6 + V SEL7 + V SEL8 is established. By transforming this expression, the _{V SEL1 + V SEL2 = V SEL5} + V SEL6, V SEL3 + V SEL4 = V SEL7 + V SEL8.

That is, according to the voltage equalizing apparatus A of the present embodiment, the sum of the voltages across the two power storage devices SEL1, SEL2 and SEL5, SEL6 and SEL3, SEL4, SEL7, and SEL8 connected in series is equalized. Can do. Here, the voltage equalizer A of the present _{embodiment, V SEL1 + V SEL2 = V} SEL3 + V SEL4 and _{V SEL5 + V SEL6 = V SEL7} + relationship V _SEL8 and _{V SEL1 = V SEL2 = V SEL3} = V SEL4 = V SEL5 = not necessarily satisfied about the relationship of _{V SEL6 = V SEL7 = V SEL8} . However, in actual use, it is not always necessary to equalize the voltage across all the electricity storage devices SELm. If the voltage across both electricity storage devices SELm is equalized as in this embodiment, Problems caused by variations in the voltage across the device SELm can often be prevented. As described above, according to the present embodiment, the number of voltage adjustment units 1 _k may be smaller than the number of the plurality of power storage devices SELm constituting the battery pack device B, so that the voltage equalization device A can be compared with the conventional example. Miniaturization and cost reduction can be achieved.

(Embodiment 2)
The voltage equalizing apparatus A of the present embodiment is characterized in that the number of voltage adjusting units 1 _k is five as shown in FIG. 3, and the other configurations are the same as in the first embodiment. Therefore, the same code | symbol is attached | subjected to the same component as Embodiment 1, and description is abbreviate | omitted.

As shown in FIG. 3, also in this embodiment, the five voltage adjustment units 1 _k are connected to the connection point of the power storage device SELm in which at least one terminal 1a or 1b is connected in series, and a pair of terminals 1a, between 1b, another one or a plurality of voltage adjuster 1 one terminal 1a or 1b of _k is connected across one or more power storage devices SELm. More specifically, a common with Embodiment 1 for voltage adjustment unit 1 ₁ to 1 _3, further one terminal 1a of the voltage adjusting portion 1 ₄ is connected to the connection point of the two power storage devices SEL1, SEL2 is connected to the other terminal 1b are two power storage devices SEL5, SEL6 connection point with the, with one terminal 1a of the voltage adjusting unit 1 ₅ is connected to the connection point of the two power storage devices SEL3, SEL4 is connected the other terminal 1b is the two power storage devices SEL7, SEL8 connection point, the electric storage device SEL of each equal (4) is between one voltage adjusting portion 1 _k of the terminals 1a, 1b are respectively connected with different voltage adjuster 1 _k of the terminals 1a, the electric storage device SEL of the same number (1) is between 1b are connected.

And Thus, if the inverter circuit 2a of the control unit 2 by the operation (oscillation), because the five secondary windings n2 ₁ ~n2 ₅ of the transformer T is wound set with the same number of turns in the same magnetic circuit same level induced occurred electromotive force five secondary winding n2 ₁ ~n2 ₅ of the voltage regulator 1 _k between terminals 1a, because DC voltage of the same level is to be applied to 1b, the respective storage between the voltage across V _SELm device _{SELm, V SEL1 + V SEL2 +} V SEL3 + V SEL4 = V SEL2 + V SEL3 + V SEL4 + V SEL5 = V SEL3 + V SEL4 + V SEL5 + V SEL6 = V SEL4 + V SEL5 + V SEL6 + V SEL7 = V SEL5 + relationship of V _SEL6 + V _SEL7 + V _SEL8 is to be established. By transforming this expression, the _{V SEL1 = V SEL5, V SEL2} = V SEL6, V SEL3 = V SEL7, V SEL4 = V SEL8.

In the voltage equalization device A of the present embodiment, not always satisfied the relationship of _{V SEL1 = V SEL2 = V SEL3} = relationships and V of _{V SEL4 SEL5 = V SEL6 = V} SEL7 = V SEL8. However, in actual use, it is not always necessary to equalize the voltage across all of the electricity storage devices SELm. If the voltage across the electricity storage devices SELm is equalized every third unit as in this embodiment, the electricity storage device Problems caused by variations in the voltage across SELm can often be prevented. Therefore, similarly to the first embodiment, in this embodiment, the number of voltage adjustment units 1 _k is smaller than the number of the plurality of power storage devices SELm constituting the assembled power storage device B. The downsizing and cost reduction of the converting apparatus A can be achieved.

Here, compared with the first embodiment, in the present embodiment, the number of voltage adjusting units 1 _k is increased by two, which is disadvantageous in terms of downsizing and cost reduction, but is advantageous in terms of voltage equalization. Thus, it may be properly determined number of voltage regulator 1 _k in response to the request of the power storage device SELm voltage across variations in the degree and size and cost of the set power storage device B. In the present embodiment, the number of power storage devices SELm handled by one voltage adjustment unit 1 _k is four. However, the number of power storage devices SELm constituting the battery assembly B is n, and one voltage adjustment unit 1 _k The number CN of voltage adjustment units 1 _k required when the number of charge storage devices SELm is b is CN = n− (b−1) (where b ≦ (n + 1) / 2). For example, if n = 8 and b = 3, CN = 6.

(Embodiment 3)
As shown in FIGS. 4A and 4B, the voltage equalizing apparatus A according to the present embodiment has a plurality of (single) storage devices SEL5 to SEL8 that have a pair of terminals and are connected between the terminals. A feature is that a second voltage adjustment block 3 having four (four) second voltage adjustment units 3a to 3d and a second control unit (not shown) for controlling the second voltage adjustment units 3a to 3d is provided. is there. However, since other configurations are the same as those in the second embodiment, the same components as those in the second embodiment are denoted by the same reference numerals and description thereof is omitted.

  The second voltage adjusting units 3a to 3d are formed by connecting series circuits of resistors Ra to Rd and switching elements (for example, bipolar transistors) Qa to Qd between a pair of terminals, respectively. By controlling the base currents of Qa to Qd to increase or decrease the discharge currents of the electricity storage devices SEL5 to SEL8 connected between the terminals, the both-end voltages of the electricity storage devices SEL5 to SEL8 are adjusted individually.

Thus, according to the present embodiment, the voltages across the four power storage devices SEL5 to SEL8 are evenly adjusted by the second voltage adjustment units 3a to 3d. As a result, V _SEL1 = V _SEL2 = V _SEL3 = relationship relationship with _{V SEL5 = V SEL6 = V SEL7} = V SEL8 of V _SEL4 become possible to hold at the same time, as it can equalize the voltage across all the storage device SELm constituting the assembled power storage device B. Here, in the present embodiment, when the second voltage adjusting units 3a to 3d are included, it seems that the circuit scale is increased as compared with the conventional example. However, in the present embodiment, the voltage adjustment unit 1 _k substantially equalizes the voltage across the terminals, and the number of power storage devices SELm that the second voltage adjustment units 3a to 3d have is small, so that these power storage devices SEL5. Since it is difficult for the voltages at both ends to vary between SEL8 and SEL8, it is not necessary to discharge the power storage devices SEL5 to SEL8 by flowing a large discharge current in a short time, and therefore, small-signal transistors are used as the switching elements Qa to Qd. At the same time, by using high resistances for the resistors Ra to Rd, a small discharge current may be passed to discharge over a long time. On the other hand, in the conventional example, since it is necessary to discharge individual power storage devices by flowing a large discharge current in a short time to achieve equalization, a power transistor is used as a switching element and a resistor is relatively resistant. The one with a small value must be used. Thus, in the present embodiment, even if the second voltage adjusting units 3a to 3d are provided, the size and cost can be reduced as compared with the conventional example.

(Embodiment 4)
The voltage equalizing apparatus A of the present embodiment is characterized by the configuration of the voltage adjustment unit 1 _k , and the other components are the same as those of any of the first to third embodiments. The illustration and description are omitted.

The voltage adjustment unit 1 _k in the first to third embodiments equalizes the both-ends voltage by charging the power storage device SELm, whereas the voltage adjustment unit 1 _k in the present embodiment discharges the power storage device SELm to discharge the both-end voltage. Are equalized.

For example, as shown in FIG. 5 (a), the voltage regulator _1k is composed of series circuits of resistors R1, R2, and R3 and switch elements (for example, bipolar transistors) Q1, Q2, and Q3, respectively. The voltage across the storage device SELm can be adjusted by controlling the base current of the switch elements Q1 to Q3 by the control unit to increase or decrease the discharge current of the storage device SELm connected between the terminals.

Alternatively, as shown in FIG. 5B, one capacitor Ck (k = 1, 2, 3, 4, 5) and a switching element (field effect transistor) for switching the connection relationship between the capacitor Ck and the power storage device SELm. ) Si (i = 1,2, ... , 14) and de-configured voltage adjustment unit 1 _k, between the electric storage device SELm and the capacitor Ck by switching element Si is turned on and off controlled by a control unit (not shown) The voltage across the storage device SELm can be adjusted by moving the charge.

A series circuit of eight switch elements S1 to S8 is connected between both poles of the battery assembly B, and the six power storage devices SEL2 to SEL7 are connected in series to the series circuit of the remaining six switch elements S9 to S14. Connected between both ends. Further, two switch elements S2 and S3, S4 and S5, S6 and S7, S10 and S11, S12 and S13 connected in series are connected to two power storage devices SEL2 and SEL3, SEL4 and SEL5, SEL6 and It is connected to each connection point of SEL7, SEL3 and SEL4, SEL5 and SEL6. Furthermore, capacitors C1 to C5 are respectively connected in parallel with two switch elements S2 and S3, S4 and S5, S6 and S7, S10 and S11, S12 and S13 connected in series. Then, the configuration voltage regulator 1 ₁ four switch element S1~S4 and one capacitor C1, the voltage adjusting unit 1 ₂ is composed of four switches elements S3~S6 and one capacitor C2, four switches elements S5~S8 and the voltage adjusting unit 1 ₃ in one capacitor C3 is composed of four switching element S9~S12 a voltage adjuster 1 ₄ one capacitor C4 is configured, four switching element S11~S14 and one A voltage adjustment unit ₁₅ is configured by the capacitor C5.

For example, connecting the voltage regulator 1 _1, if off the switch elements S2, S4 of the even numbered with turning on the switch elements S1, S3 of odd numbers, the capacitor C1 is in series circuit of two power storage devices SEL1, SEL2 Then, the charge moves from the power storage devices SEL1, SEL2 to the capacitor C1 until the voltage is equal to the voltage across the two power storage devices SEL1, SEL2. Next, when the odd-numbered switch elements S1 and S3 are turned off and the even-numbered switch elements S2 and S4 are turned on, the capacitor C1 is connected to the series circuit of two other power storage devices SEL3 and SEL4. Charges move from the capacitor C1 to the two power storage devices SEL3 and SEL4. And the both-ends voltage of each set of electrical storage device SELm can be equalized gradually by mutually moving an electric charge between capacitors C1-C5 and two sets of electrical storage devices SELm. However, the order or combination of turning on / off the switch elements S1 to S14 is an example, and is not intended to be limited to this.

(Embodiment 5)
FIG. 6 shows an embodiment of the charging device according to the present invention. The charging device F of the present embodiment is characterized in that the voltage equalizing device A described in the first embodiment is incorporated.

  First, the assembled power storage device B charged by the charging device F of the present embodiment will be described. This assembled power storage device B is configured to individually connect a plurality of (in the illustrated example, 12) power storage devices SELm (m = 1, 2,..., 12) connected in series and the voltage across each of the four power storage devices SELm. Voltage monitoring circuits 11A, 11B, and 11C to be monitored, and a control circuit 10 that outputs a charging and discharging permission signal and a stop signal to the control signal terminal 12 according to the monitoring results of the voltage monitoring circuits 11A, 11B, and 11C. Yes. As already described, an upper limit value and a lower limit value (both are collectively referred to as a “limit value”) are set for the electricity storage device SELm made of a lithium ion battery. If it is determined that the voltage across the power storage device SELm monitored by the monitoring circuit 11A,... Reaches the upper limit value, a stop signal for instructing the charging device F to stop charging is supplied to the control signal terminal 12. If the voltage across the power storage device SELm is monitored by the voltage monitoring circuit 11A at the time of discharging and reaches the lower limit value, the load is stopped with respect to the load device (not shown). A stop signal for instructing (stop of discharge) is output via the control signal terminal 12. Further, the control circuit 10 determines which of the charging device F and the load device is connected based on a control signal input from the control signal terminal 12, is connected to the charging device F, and is connected to the voltage monitoring circuit 11A, If the voltage across both power storage devices SELm monitored in... Is less than the upper limit value, a charging start signal for charging the charging device F is output via the control signal terminal 12 and connected to the load device. If the voltage across all power storage devices SELm monitored by the voltage monitoring circuits 11A,... Does not reach the lower limit value, a discharge permission signal for permitting the load device to operate the load is sent via the control signal terminal 12. Output.

  On the other hand, the charging device F includes a rectifier 20 that rectifies an AC voltage supplied from a commercial AC power supply AC, an inverter circuit 21 that converts a pulsating voltage rectified by the rectifier 20 into a high-frequency AC voltage, and an output from the inverter circuit 21. Rectifier 22 that rectifies the high-frequency AC voltage that is generated, and charging that controls the operation of inverter circuit 21 in accordance with a control signal (a charge start signal or a charge stop signal) input from assembled battery device B via control signal terminal 12 A control circuit 23 and a voltage equalizing apparatus A are provided.

Voltage equalizer A similarly be three voltage adjusting unit 1 _k and (k = 1, 2, 3) from the control unit 2 and the embodiment 1, which is connected to one terminal 1a of the voltage regulator 1 ₁ The connection terminal 13 ₁ is connected to the positive electrode of the power storage device SEL1 (the positive electrode of the battery assembly device B), and the connection terminal 13 ₃ connected to the other terminal 1b is connected to the connection point of the two power storage devices SEL6 and SEL7. the voltage adjuster 1 while connecting terminal 13 ₂ connected to the terminal 1a of ₂ are two power storage devices SEL3, connection terminals 13 ₄ connected to the other terminal 1b is connected to the connection point of SEL4 is 2 is connected to the connection point of the number of power storage devices SEL9, SEL10, the other with the voltage adjusting unit 1 while connecting terminal 13 ₃ connected to the terminal 1a of the _three are connected to a connection point of the two power storage devices SEL6, SEL7 End of Connection terminal 13 ₅ connected to the child 1b is connected to a negative electrode of an energy storage device SEL1 (negative electrode of the set power storage device B), 1 single voltage adjustment unit 1 _k of the terminals 1a, each the same number of (six) Between 1b storage device SEL of the electric storage device SEL is different voltage adjusting unit 1 _k of the terminal 1a is connected respectively, the same number is between 1b (3 pieces) are connected. In the voltage equalization apparatus A according to the present embodiment, the voltage across the power storage devices SELm in a total of four sets of three can be equalized.

  In the present embodiment, since the voltage equalizing apparatus A is built in the charging apparatus F, the configuration of the assembled power storage apparatus B can be simplified.

(Embodiment 6)
FIG. 7 shows an embodiment of the assembled power storage device and the charging device according to the present invention. In the present embodiment, three voltage adjustment units 1 _k (k = 1, 2, 3) constituting the voltage equalizing apparatus A are built in the assembled power storage device B, and the control unit 2 constituting the voltage equalizing apparatus A includes It is characterized in that it is built in the charging device F. However, since the basic configuration of the assembled power storage device B and the charging device F in this embodiment is the same as that of the assembled power storage device B and the charging device F described in the fifth embodiment, common constituent elements are denoted by the same reference numerals. The description is omitted.

The charging device F and the assembled power storage device B are connected to the connection terminal 13 ₁ connected to the positive electrode of the power storage device SEL1 (positive electrode of the assembled power storage device B) and the negative electrode of the power storage device SEL12 (negative electrode of the assembled power storage device B). The connection terminal 13 ₂ and the control signal terminal 12 are connected via three terminals. However, between the control unit 2 of the voltage equalizing apparatus A and each voltage adjusting unit 1 _k , power is supplied in a non-contact manner due to magnetic coupling between the primary winding n1 of the transformer T and the secondary windings n2 _{1 to} n2 _3. Is done.

Thus, according to the present embodiment, since contactless power feeding is performed between the control unit 2 of the voltage equalizing apparatus A and each voltage adjusting unit 1 _k , the connection terminal 13 is compared with the fifth embodiment. Can be reduced from six to two.

(Embodiment 7)
FIG. 8 shows an embodiment of a charging system including the assembled power storage device and the charging device according to the present invention. In the present embodiment, three voltage adjusting units 1 _k (k = 1, 2, 3) constituting the voltage equalizing apparatus A and the primary winding n1 of the control unit 2 are built in the battery assembly B, and the voltage equalizing The charging device F is characterized in that the inverter circuit 2a of the control unit 2 constituting the converter A is incorporated in the charging device F. However, since the basic configuration of the battery pack device B and the charging device F in this embodiment is the same as that of the battery pack device B and the charging device F described in the fifth and sixth embodiments, the same reference numerals are used for the common components. A description thereof will be omitted.

The charging device F and the assembled power storage device B are connected to the connection terminal 13 ₁ connected to the positive electrode of the power storage device SEL1 (positive electrode of the assembled power storage device B) and the negative electrode of the power storage device SEL12 (negative electrode of the assembled power storage device B). The connection terminal 13 ₂ , the output terminal of the inverter circuit 2 a and the pair of connection terminals 13 ₃ , 13 ₄ for connecting the primary winding n 1 of the transformer T and the control signal terminal 12 are connected.

Thus, according to the present embodiment, the three voltage adjusting units 1 _k constituting the voltage equalizing apparatus A and the primary winding n1 of the control unit 2 are built in the battery assembly B, and the voltage equalizing apparatus A is Since the inverter circuit 2a of the control unit 2 to be configured is built in the charging device F, the number of connection terminals 13 can be reduced from six to five as compared with the fifth embodiment.

  However, the configuration of the voltage equalizing apparatus A described in the second embodiment may be adopted in the present embodiment and may be configured as shown in FIG.

In the first to seventh embodiments described above, the secondary winding n2 _{k included in} the voltage adjusting unit 1 _k of the voltage equalizing apparatus A is wound around the same magnetic circuit (for example, an iron core) with the same number of turns. However, in actuality, the induced electromotive force generated in each secondary winding n2 _k is not necessarily equal due to the influence of the leakage magnetic flux, so the number of turns is set so that the induced electromotive force generated in the secondary winding n2 _k is equal. It is obvious that the fine adjustment is performed, and it is obvious that winding is performed with “the same number of turns” including the range of such fine adjustment. In addition, each secondary winding n2 _k may be formed by a plurality of single windings being stacked on top of each other, or an intermediate tap is provided for each winding with the same number of turns. It may be what was done. Furthermore, regarding the assembled power storage device B, only a configuration in which a plurality of power storage devices SELm is simply connected in series is disclosed, but the present invention is not limited to this, and a series circuit of a plurality of power storage devices SELm is connected in parallel or directly. It may be a configuration connected in parallel.

It is a circuit block diagram which shows Embodiment 1 of the voltage equalization apparatus which concerns on this invention. (A), (b) is a circuit block diagram of the inverter circuit in the same as the above. It is a circuit block diagram which shows Embodiment 2 of the voltage equalization apparatus which concerns on this invention. (A) is a circuit block diagram which shows Embodiment 3 of the voltage equalization apparatus based on this invention, (b) is a circuit block diagram of a 2nd voltage adjustment block. (A), (b) is the circuit block diagram which abbreviate | omitted partially showing Embodiment 4 of the voltage equalization apparatus based on this invention. It is a circuit block diagram which shows Embodiment 5 of the charging device which concerns on this invention. It is a circuit block diagram which shows Embodiment 6 of the charging device and assembled battery apparatus which concern on this invention. It is a circuit block diagram which shows Embodiment 7 of the charging device and assembled battery apparatus which concern on this invention. It is a circuit block diagram which shows the charging device and assembled battery apparatus of another structure same as the above.

Explanation of symbols

A voltage equalizing device B group battery storage device SEL1 to SEL8 power storage device 1 ₁ to 1 ₃ voltage adjustment unit 1a, 1b terminal 2 control unit 2a inverter circuit T transformer n1 primary winding n2 _{1 to} n2 ₃ secondary winding D1 D3 diode

Claims (10)

A voltage equalizing device for equalizing both-end voltages of each power storage device of a set power storage device in which a plurality of single power storage devices are connected in series,
A plurality of voltage adjustment units that charge or discharge a plurality of power storage devices that have a pair of terminals and are connected in series between the terminals, and a control unit that controls the plurality of voltage adjustment units,
The voltage adjustment unit is connected to a connection point of an electricity storage device in which at least one terminal is connected in series, and one terminal of the other one or more voltage adjustment units is one or more between a pair of terminals. A voltage equalizing apparatus, wherein the voltage equalizing apparatus is connected with an electricity storage device interposed therebetween.   The voltage equalization apparatus according to claim 1, wherein the number of power storage devices connected in series between terminals of each voltage adjustment unit is the same in all voltage adjustment units. Have a second control unit for controlling a plurality of second voltage adjusting unit for charging or discharging a single storage device that is connected between the terminals has a pair of terminals, a second voltage adjusting unit of the plurality ,
3. The voltage equalization according to claim 2, wherein the second voltage regulator is connected to both ends of a plurality of power storage devices connected in series between a pair of terminals of any one of the voltage regulators. Device.   The voltage adjusting unit includes a series circuit of a secondary winding of a transformer and a rectifying element connected between a pair of terminals, and the control unit is configured to apply an AC voltage to the primary winding of the transformer. The voltage equalizing apparatus according to any one of claims 1 to 3.   5. The voltage equalizing apparatus according to claim 4, wherein the transformer has one primary winding and a plurality of secondary windings having the same number of turns.   The voltage adjustment unit includes a series circuit of a resistance element and a switch element connected between a pair of terminals, and the control unit controls the switch element. The voltage equalization apparatus as described.   The voltage adjustment unit includes one or more capacitors and a switch element that switches a connection relationship between the capacitor and the power storage device, and the control unit performs on / off control of the switch element to control between the power storage device and the capacitor. The voltage equalization apparatus according to any one of claims 1 to 3, wherein the electric charge is moved by the step.   A charging device comprising the voltage equalizing device according to claim 1. Single storage device is a set power storage device which are connected to each other in series, the set power storage device characterized by comprising a voltage adjusting unit of one of the voltage equalization device of claims 1-7. A plurality of single power storage devices are connected in series, and the assembled power storage device having the voltage adjustment unit of the voltage equalization device according to any one of claims 1 to 7 , and the voltage equalization according to any one of claims 1 to 7. A charging system comprising: a charging device having a control unit of the converting device.

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