JP2014193016A - Power storage device, battery controller, and battery control method - Google Patents

Abstract

Provided are a power storage device, a battery control device, and a battery control method, which have high charge transfer efficiency per unit time and can freely select a battery cell on a discharge side and a charge side.
A power storage device determines a discharge battery cell group and a charge battery cell group based on a voltage for each of a plurality of battery cells and determines a connection destination of a first terminal pair. The connection destination of the second terminal pair 120 is set to the determined charging battery cell group, and the battery cell 210 included in the discharge battery cell group is insulated from the first terminal pair and the second terminal pair. Based on the number and the number of battery cells 210 included in the rechargeable battery cell group, the first voltage applied to the first terminal pair 110 is converted into the second voltage, and the converted second voltage is converted into the second terminal pair. Apply to 120.
[Selection] Figure 1

Description

  The present invention relates to a power storage device, a battery control device, and a battery control method that align voltages of a plurality of battery cells.

  When charging / discharging is repeated for a plurality of battery cells connected in series, the capacity (voltage) of each battery cell varies due to variations in the characteristics of each battery cell. Here, since the discharge capacity of the whole battery cells connected in series depends on the battery cells having a small capacity, if there is variation in the capacity of each battery cell, there is a possibility that a sufficient discharge capacity cannot be obtained at the time of discharging. . In addition, when the battery cell capacity varies, charging with a battery cell having a small capacity as a reference results in overcharge of the battery cell with a large capacity, and conversely, charging with a battery cell with a large capacity as a reference results in a battery cell. The overall charge capacity may be reduced.

  In order to solve the above-described problems, a cell balance circuit that matches the capacity of each battery cell is used. The cell balance circuit includes a resistance method, a capacitor method, and an inductor method. In particular, in the capacitor-type and inductor-type cell balance circuits, the capacity of each battery cell is made uniform by moving (discharging) the charge from the battery cell having a large capacity to the battery cell having a small capacity. Thereby, the discharge capacity of the whole battery cell can be increased at the time of discharge, and a sufficient charge capacity can be ensured while preventing overcharging of a large capacity battery cell at the time of charge.

  Patent Document 1 discloses an example of a battery control device equipped with a capacitor type cell balance circuit. Patent Document 2 discloses an example of an inductor type cell balance circuit.

JP 11-355966 A JP 2011-244680 A

  However, in the capacitor-type cell balance circuit described in Patent Document 1, it is necessary to temporarily store the charge transferred from the discharge-side battery cell in the capacitor. For this reason, in the capacitor type cell balance circuit, charges cannot be continuously transferred, and charge transfer efficiency per unit time is poor.

  On the other hand, in the inductor type cell balance circuit described in Patent Document 2, it is not necessary to store charges unlike the capacitor type, and the charges can be moved continuously, so that the charge transfer efficiency per unit time is high. good. However, the cell balance circuit described in Patent Document 2 takes out energy from an arbitrary number of battery cells, distributes the extracted energy to all battery cells, or takes out energy from all battery cells, It can only distribute the extracted energy to a number of battery cells. That is, in the cell balance circuit described in Patent Document 2, one of the discharge-side and charge-side battery cells is always fixed, and the discharge-side and charge-side battery cells cannot be selected freely.

  An object of the present invention is to provide a power storage device, a battery control device, and a battery control method that have good charge transfer efficiency per unit time and that can freely select the discharge-side and charge-side battery cells. .

According to the present invention,
A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the number of the battery cells included in the discharge battery cell group and the number of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
Is provided.

According to the present invention,
A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the total voltage of the battery cells included in the discharge battery cell group and the total voltage of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
Is provided.

According to the present invention,
A battery control device for aligning voltages of a plurality of battery cells connected in series,
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the number of the battery cells included in the discharge battery cell group and the number of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
A battery control device is provided.

According to the present invention,
A battery control device for aligning voltages of a plurality of battery cells connected in series,
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the total voltage of the battery cells included in the discharge battery cell group and the total voltage of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
A battery control device is provided.

According to the present invention,
A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
Preparing a second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group; ,
Battery control device
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And outputting a second control signal with the connection destination of the second terminal pair as the determined rechargeable battery cell group,
In accordance with the first control signal, a connection destination of the first terminal pair is set,
In accordance with the second control signal, a connection destination of the second terminal pair is set,
Outputting a transformation signal based on the number of the battery cells included in the discharge battery cell group and the number of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Applying a voltage to the second terminal pair;
A battery control method is provided.

According to the present invention,
A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
Preparing a second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group; ,
Battery control device
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And outputting a second control signal with the connection destination of the second terminal pair as the determined rechargeable battery cell group,
In accordance with the first control signal, a connection destination of the first terminal pair is set,
In accordance with the second control signal, a connection destination of the second terminal pair is set,
Output a transformation signal based on the total voltage of the battery cells included in the discharge battery cell group and the total voltage of the battery cells included in the charge battery cell group,
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Applying a voltage to the second terminal pair;
A battery control method. Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the voltage of the several battery cell connected in series can be equalized efficiently, and the battery cell of the discharge side and charge side made into the object which arrange | positions a voltage can be selected freely.

It is a block diagram which shows the structure of an electrical storage apparatus. It is a figure for demonstrating the operation example of a switching control part. It is the schematic which shows the 1st structural example of a 1st switching part and a 2nd switching part. It is the schematic which shows the 2nd structural example of a 1st switching part and a 2nd switching part. It is a figure for demonstrating the operation example of a transformation control part. It is a block diagram which shows the structure of the transformation part using an insulation type DC-DC converter. It is a flowchart which shows the flow of a process of an electrical storage apparatus. It is a figure for demonstrating the operation example of the transformation control part in a modification. It is a figure for demonstrating the buck-boost ratio of the transformation | transformation part in another modification. It is a figure for demonstrating the operation | movement in another modification specifically.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

(Embodiment)
2 is a block diagram showing a configuration of a power storage device 10. FIG. The power storage device 10 includes a battery control device that aligns the voltages of a plurality of battery cells 210 connected in series, and a plurality of battery cells 210 connected in series. In FIG. 1, the power storage device 10 includes a first terminal pair 110, a second terminal pair 120, a switching control unit 130, a first switching unit 140, a second switching unit 150, a transformation control unit 160, Part 170 and battery part 200 including a plurality of battery cells 210 connected in series. In the power storage device 10 of FIG. 1, the first terminal pair 110, the second terminal pair 120, the switching control unit 130, the first switching unit 140, the second switching unit 150, the transformation control unit 160, The part constituted by the transformer unit 170 can be called a battery control device.

  The switching control unit 130 controls operations of the first switching unit 140 and the second switching unit 150. Specifically, the switching control unit 130 determines the discharge battery cell group and the charge battery cell group based on the voltage measured for each battery cell 210. Furthermore, the switching control unit 130 outputs the first control signal S1 and the second control signal S2 based on the determined discharge battery cell group and charge battery cell group. The first control signal S1 is output to the first switching unit 140. The first control signal S1 is a signal for controlling the first switching unit 140 so as to connect the first terminal pair 110 and the discharge battery cell group. The second control signal S2 is output to the second switching unit 150. The second control signal S2 is a signal for controlling the second switching unit 150 so as to connect the second terminal pair 120 and the rechargeable battery cell group. In addition, the switching control unit 130 connects terminals having the same polarity between the second terminal pair 120 and the rechargeable battery cell group based on the configurations of the first switching unit 140, the second switching unit 140, and the transformation unit 170. As described above, the first control signal S1 and the second control signal S2 are generated.

  Specifically, the switching control unit 130 first measures the voltage for each of the plurality of battery cells 210. Then, for example, the switching control unit 130 determines that the battery cell 210 having a voltage equal to or higher than a predetermined threshold is a high voltage cell, and the battery cell 210 having a voltage lower than the predetermined threshold is a low voltage cell. The method for determining the high voltage cell and the low voltage cell is not limited to this, and various methods can be used. For example, the switching control unit 130 determines whether each battery cell 210 is a high voltage cell or a low voltage cell with reference to the voltage of the battery cell 210 having the highest voltage or the lowest voltage among the plurality of battery cells 210. You may judge. In this case, the switching control unit 130 determines whether each battery cell 210 is a high voltage cell or a low voltage cell by determining whether the voltage of each battery cell 210 is equal to or higher than a predetermined ratio with respect to a reference voltage. Can be judged. And the switching control part 130 determines a discharge battery cell group and a charge battery cell group based on this determination result. Among the plurality of battery cells 210, a high voltage cell and a low voltage cell may be mixed in various states. Among them, for example, the switching control unit 130 sets a portion where the highest number of high voltage cells are continuously connected in series as a discharge battery cell group. In addition, the switching control unit 130 sets, for example, a portion where the most low voltage cells are continuously connected in series as a rechargeable battery cell group. In addition, the switching control unit 130 may preferentially select a part including the battery cell 210 that is close to overcharge or overdischarge as a discharge battery cell group or a charge battery cell group.

  Here, an operation example of the switching control unit 130 in the present embodiment will be described with reference to FIG. FIG. 2 is a diagram for explaining an operation example of the switching control unit 130. For convenience of explanation, FIG. 2 illustrates an example in which four battery cells 210 are connected in series. First, in the example of FIG. 2A, three continuous high voltage cells A to C and one low voltage cell D are connected in series. In this case, the switching control unit 130 determines three consecutive high voltage cells A to C as a discharge battery cell group. In addition, the switching control unit 130 determines the low voltage cell D as a rechargeable battery cell group. Next, in the example of FIG. 2B, two continuous low-voltage cells A and B, one high-voltage cell C, and one low-voltage cell D near the overdischarge are connected in series. . In this case, the switching control unit 130 determines the high voltage cell C as a discharge battery cell group. Further, since the low voltage cell D is close to overdischarge, the switching control unit 130 preferentially determines the low voltage cell D as the rechargeable battery cell group instead of the two continuous low voltage cells A and B. Finally, in the example of FIG. 2C, one high voltage cell A and three consecutive low voltage cells are connected in series. In this case, the switching control unit 130 determines the high voltage cell A as a discharge battery cell group. In addition, the switching control unit 130 determines three consecutive low voltage cells as a rechargeable battery cell group.

  Further, the switching control unit 130, based on the result determined as in the above example, a first control signal S1 in which information indicating the discharge battery cell group to which the first switching unit 140 is connected is set; The second control signal S2 in which information indicating the rechargeable battery cell group to which the second switching unit 150 is connected is set is output to the first switching unit 140 and the second switching unit 150, respectively.

  The first switching unit 140 sets the connection destination of the first terminal pair 110 to the discharge battery cell group determined by the switching control unit 130 according to the first control signal S1 output from the switching control unit 130. Here, the first terminal pair 110 includes a pair of terminals 110a and 110b. The first switching unit 140 connects either one of the terminals 110a and 110b to the positive terminal of the battery cell 210 located most upstream in the discharge battery cell group, and the other in the discharge battery cell group. The connection destination of the first terminal pair 110 is set by connecting to the negative electrode terminal of the battery cell 210 located on the most downstream side. In addition, the 1st switching part 140 can recognize the position of a discharge battery cell group using the information set to 1st control signal S1.

  The second switching unit 150 sets the connection destination of the second terminal pair 120 to the rechargeable battery cell group determined by the switching control unit 130 according to the second control signal S2 output from the switching control unit 130. Here, the second terminal pair 120 is configured by a pair of terminals 120a and 120b. The second switching unit 150 connects either one of the terminals 120a and 120b to the positive terminal of the battery cell 210 located most upstream in the charging battery cell group, and the other in the charging battery cell group. The connection destination of the second terminal pair 120 is set by connecting to the negative electrode terminal of the battery cell 210 located on the most downstream side. In addition, the 2nd switching part 150 can recognize the position of a charging battery cell group using the information set to 2nd control signal S2.

  Here, the structural example of the 1st switching part 140 and the 2nd switching part 150 is shown in FIG.3 and FIG.4. FIG. 3 is a schematic diagram illustrating a first configuration example of the first switching unit 140 and the second switching unit 150.

  In FIG. 3, the first switching unit 140 includes a plurality of changeover switches 141 and buses 142a and 142b. The bus 142a is connected to the terminal 110a. The bus 142b is connected to the terminal 110b. One end of each of the plurality of changeover switches 141 is alternately connected to the buses 142a and 142b every other one. The other ends of the plurality of changeover switches 141 are connected between two adjacent battery cells 210. Note that, among the plurality of changeover switches 141, the other end of the changeover switch 141 located on the most upstream side is connected to the positive terminal of the battery cell 210 located on the most upstream side of the battery unit 200. Further, among the plurality of changeover switches 141, the other end of the changeover switch 141 located on the most downstream side is connected to the negative electrode terminal of the battery cell 210 located on the most downstream side of the battery unit 200. In response to the first control signal S1, the first switching unit 140 selects one of the plurality of changeover switches 141 connected to the bus 142a and one of the plurality of changeover switches 141 connected to the bus 142b. The discharge battery cell group and the first terminal pair 110 are connected to each other by turning them on. Thereby, the positive electrode terminal of the battery cell 210 located most upstream in the discharge battery cell group is connected to one of the terminals 110a and 110b of the first terminal pair. Moreover, the negative electrode terminal of the battery cell 210 located most downstream in the discharge battery cell group is connected to the terminal that is not connected to the positive electrode terminal among the terminals 110a and 110b of the first terminal pair.

  In FIG. 3, the second switching unit 150 includes a plurality of changeover switches 151, a current control switch 152, and buses 153a and 153b. The buses 153 a and 153 b are disposed between the plurality of changeover switches 151 and the current control switch 152. One end of each of the plurality of changeover switches 151 is alternately connected to the buses 153a and 153b every other one. The other ends of the plurality of changeover switches 151 are connected between two adjacent battery cells 210. Note that, among the plurality of changeover switches 151, the other end of the changeover switch 151 located on the uppermost stream is connected to the positive terminal of the battery cell 210 located on the uppermost stream of the battery unit 200. Further, among the plurality of changeover switches 151, the other end of the changeover switch 151 located on the most downstream side is connected to the negative electrode terminal of the battery cell 210 located on the most downstream side of the battery unit 200. The current control switch 152 includes a first switch pair 152a and a second switch pair 152b. One end of the first switch pair 152a is connected to the terminal 120a. The other end of the first switch pair 152a is branched by two switches. One switch is connected to the bus 153a and the other switch is connected to the bus 153b. One end of the second switch pair 152b is connected to the terminal 120b. The other end of the second switch pair 152b is branched by two switches. One switch is connected to the bus 153a and the other switch is connected to the bus 153b. The second switching unit 150 controls the combination of the ON / OFF state of the changeover switch 151 and the current control switch 152 in accordance with the second control signal S2, so that the rechargeable battery cell group and the second terminal pair 120 are connected. Connecting. Specifically, the second switching unit 150 connects the rechargeable battery cell group and the second terminal pair 120 as follows.

  In response to the second control signal S2, the second switching unit 150 turns on the changeover switch 151 connected to the positive electrode terminal of the battery cell 210 located upstream in the charged battery cell group. Moreover, the 2nd switching part 150 turns ON the changeover switch 151 connected to the negative electrode terminal of the battery cell 210 located in the most downstream among charge battery cell groups according to 2nd control signal S2.

  Here, the polarity of the voltage applied to the second terminal pair 120 may vary depending on the configuration of the discharge battery cell group connected to the first terminal pair 110 and the transformer unit 170. Moreover, in order to flow an electric current in the direction which charges a rechargeable battery cell group, it is necessary to connect terminals of the same polarity between the second terminal pair 120 and the rechargeable battery cell group. Therefore, the current control switch 152 is controlled to switch the connection destination of the first switch pair 152a and the second switch pair 152b in accordance with the polarity of the voltage applied to the second terminal pair 120 by the second control signal S2. Is done. Here, as an example, a description will be made on the assumption that a voltage is applied to the second terminal pair 120 so that the terminal 120a is a positive electrode and the terminal 120b is a negative electrode. At this time, when the most downstream battery cell 210 of the battery unit 200 is a charged battery cell group, the first switch pair 152a is controlled to be connected to the positive terminal of the battery cell 210 by the second control signal S2. Is done. That is, the upper switch of the first switch pair 152a is turned on, and the lower switch is turned off. On the other hand, the second switch pair 152b is controlled to be connected to the negative terminal of the battery cell 210 by the second control signal S2. That is, the upper switch of the second switch pair 152b is turned on, and the lower switch is turned off. In this way, terminals having the same polarity are connected between the second terminal pair 120 and the rechargeable battery cell group. And the direction of the electric current which flows from the 2nd terminal pair 120 is controlled so that it may become a direction which charges a charging battery cell group.

  Further, the current control switch 152 may be included in the first switching unit 140 instead of the second switching unit 160. In this case, the current control switch 152 controls the polarity of the voltage applied to the second terminal pair 120 by controlling the polarity of the voltage applied to the first terminal pair 110 in accordance with the first control signal S1. To do. The current control switch 152 controls the direction of the current flowing from the second terminal pair 120 to the rechargeable battery cell group.

  FIG. 4 is a schematic diagram illustrating a second configuration example of the first switching unit 140 and the second switching unit 150. In FIG. 4, the first switching unit 140 includes a plurality of selector switch pairs 143 and buses 144a and 144b. The bus 144a is connected to the terminal 110a. The bus 144b is connected to the terminal 110b. One ends of the plurality of selector switch pairs 143 are branched by a first switch 143a and a second switch 143b, respectively. One end via the first switch 143a is connected to the bus 142a. One end via the second switch 143b is connected to the bus 142b. The other ends of the plurality of changeover switch pairs 143 are connected between two adjacent battery cells 210. Note that, among the plurality of changeover switch pairs 143, the other end of the changeover switch pair 143 located on the most upstream side is connected to the positive terminal of the battery cell 210 located on the most upstream side of the battery unit 200. In addition, the other end of the changeover switch pair 143 located on the most downstream side of the plurality of changeover switch pairs 143 is connected to the negative electrode terminal of the battery cell 210 located on the most downstream side of the battery unit 200. The first switching unit 140 switches the ON / OFF state of the first switch 143a and the second switch 143b according to the first control signal S1, so that the connection destination of the switch switch pair 143 is set to any of the terminals 110a and 110b. Switch to either. Specifically, if the first switch 143a is in the ON state, the second switch 143b is in the OFF state, and the connection destination is the terminal 110a. On the other hand, if the second switch 143b is in the ON state, the first switch 143a is in the OFF state, and the connection destination is the terminal 110b. Which of the first switch 143a and the second switch 143b is turned on is determined by the first control signal S1.

  In order to connect the first terminal pair 110 and the discharge battery cell group, two changeover switch pairs 143 are used. Specifically, the discharge battery cell group and the first terminal pair 110 are connected by determining the connection destinations of the two changeover switch pairs 143 based on the first control signal S1. The connection destinations of the two changeover switch pairs 143 are controlled by the first control signal S1 so that one becomes the terminal 110a and the other becomes the terminal 110b.

  Similarly, the second switching unit 150 includes a plurality of selector switch pairs 154 and buses 155a and 155b. The bus 155a is connected to the terminal 120a. The bus 155b is connected to the terminal 120b. One ends of the plurality of selector switch pairs 154 are branched by a first switch 154a and a second switch 154b. One end branched by the first switch 154a is connected to the bus 155a. One end branched by the second switch 154b is connected to the bus 155b. The other ends of the plurality of changeover switch pairs 154 are connected between two adjacent battery cells 210. Note that, among the plurality of changeover switch pairs 154, the other end of the changeover switch pair 154 located on the uppermost stream is connected to the positive electrode terminal of the battery cell 210 located on the uppermost stream of the battery unit 200. In addition, among the plurality of changeover switch pairs 154, the other end of the changeover switch pair 154 located on the most downstream side is connected to the negative electrode terminal of the battery cell 210 located on the most downstream side of the battery unit 200. The second switching unit 150 switches the ON / OFF state of the first switch 154a and the second switch 154b in accordance with the second control signal S2, thereby changing the connection destination of the switch switch pair 154 to any of the terminals 120a and 120b. Switch to either. Specifically, if the first switch 154a is in the ON state, the second switch 154b is in the OFF state, and the connection destination is the terminal 120a. Conversely, if the second switch 154b is in the ON state, the first switch 154a is in the OFF state and the connection destination is the terminal 120b. Which of the first switch 154a and the second switch 154b is turned on is determined by the second control signal S2.

  In order to connect the second terminal pair 120 and the rechargeable battery cell group, two changeover switch pairs 154 are used. Specifically, the connection destination of the two changeover switch pairs 154 is determined based on the second control signal S2, whereby the rechargeable battery cell group and the second terminal pair 120 are connected. The connection destinations of the two changeover switch pairs 154 are controlled by the second control signal S2 so that one becomes the terminal 120a and the other becomes the terminal 120b. The connection destination of each of the two changeover switch pairs 154 is determined by the polarity of the voltage applied to the second terminal pair 120. Specifically, when a voltage is applied to the second terminal pair 120 such that the terminal 120a is a positive electrode and the terminal 120b is a negative electrode, the upstream switch pair 154 has the first switch 154a turned on, The second switch 154b is controlled by the second control signal S2 so as to be in the OFF state. On the other hand, the downstream switch pair 154 is controlled by the second control signal S2 so that the second switch 154b is in the ON state and the first switch 154a is in the OFF state. Further, when a voltage is applied to the second terminal pair 120 so that the terminal 120a is a negative electrode and the terminal 120b is a positive electrode, the upstream switch pair 154 has the second switch 154b turned on, It is controlled by the second control signal S2 so that the switch 154a is turned off. On the other hand, the downstream switch pair 154 is controlled by the second control signal S2 so that the first switch 154a is in the ON state and the second switch 154b is in the OFF state. In this way, terminals having the same polarity are connected between the second terminal pair 120 and the rechargeable battery cell group. And the direction of the electric current which flows from the 2nd terminal pair 120 is controlled so that it may become a direction which charges a charging battery cell group.

  The transformation control unit 160 controls the operation of the transformation unit 170. In the present embodiment, the transformation control unit 160 controls the operation of the transformation unit 170 based on the number of battery cells 210 included in the discharge battery cell group and the number of battery cells 210 included in the charge battery cell group. A transformation signal S3 is generated and output to the transformation unit 170. In this embodiment, when the number of battery cells 210 included in the discharge battery cell group is larger than the number of battery cells 210 included in the charge battery cell group, an excessively large charge voltage is applied to the charge battery cell group. Need to be prevented. Therefore, the transformation control unit 160 outputs a transformation signal S3 that controls the transformation unit 170 so as to step down the first voltage within a range in which the rechargeable battery cell group can be charged. Further, when the number of battery cells 210 included in the discharge battery cell group is equal to or less than the number of battery cells 210 included in the charge battery cell group, a charging voltage necessary for charging the charge battery cell group is secured. There is a need. Therefore, the transformation control unit 160 outputs a transformation signal S3 that controls the transformation unit 170 so as to boost the first voltage within a range where an excessive charging voltage is not applied to the rechargeable battery cell group. In addition, the voltage value used as the excessive charging voltage can be determined in view of the product specifications of the battery cell 210 used in the battery unit 200. The voltage boosted and stepped down by the transformer 170 is applied to the second terminal pair 120 as the second voltage.

  Here, an operation example of the transformation control unit 160 in the present embodiment will be described with reference to FIG. FIG. 5 is a diagram for explaining an operation example of the transformation control unit 160. In the example shown in FIG. 5A, three continuous high voltage cells A to C and one low voltage cell D are connected in series. In this case, as described with reference to FIG. 2, the switching control unit 130 determines the high voltage cells A to C as the discharge battery cell group and the low voltage cell D as the charge battery cell group. Then, the transformation control unit 160 determines the first voltage based on the ratio of the number of battery cells 210 included in the charging electric cell group when the number of battery cells 210 included in the discharge battery cell group is used as a reference. The step-up / step-down ratio N is calculated. Here, when the number of battery cells 210 included in the discharge battery cell group is larger than the number of battery cells 210 included in the charge battery cell group, the first voltage is not transformed into the second terminal pair 120 as it is. When applied, an excessive voltage may be applied to the battery cells 210 included in the charging battery cell group via the second terminal pair 120. Therefore, in the case as shown in FIG. 5A, it is necessary to step down the second voltage applied to the second terminal pair 120 with respect to the first voltage. Furthermore, in order to charge the rechargeable battery cell group, the second voltage needs to be larger than the total voltage of the battery cells 210 included in the rechargeable battery cell group. Therefore, the transformation control unit 160 increases the step-up / step-down ratio N larger than the ratio of the number of battery cells 210 included in the charging electric cell group when the number of battery cells 210 included in the discharge battery cell group is used as a reference. Set. The voltage transformation control unit 160 sets the step-up / step-down ratio N to 1 to the ratio of the number of battery cells 210 included in the charging electric cell group when the number of battery cells 210 included in the discharge battery cell group is used as a reference. It is preferable to increase it by about 10%. At this time, the second voltage is larger than the voltage of the rechargeable battery cell group, but the second voltage is actually equal to the voltage of the rechargeable battery cell group. However, in order to make the voltage of the rechargeable battery cell group equal to the second voltage in accordance with the step-up / down ratio N, the transformation control unit 160 passes a current for charging the rechargeable battery cell group. This current is a value set in the transformation control unit 160. In the example shown in FIG. 5A, the number of battery cells 210 included in the discharge battery cell group is three, and the number of battery cells 210 included in the charge battery cell group is one. In 160, a value slightly larger than 1/3 is calculated as the step-up / step-down ratio N. Then, the transformation control unit 160 steps down the first voltage according to the step-up / step-down ratio N, and outputs a transformation signal S3 that converts the first voltage to the second voltage to the transformation unit 170. Then, the transformer 170 applies the second voltage transformed according to the transformation signal S3 to the second terminal pair. Then, the battery cell 210 included in the charging battery cell group is charged by the second voltage applied to the second terminal pair.

  Also in the examples shown in FIG. 5B and FIG. 5C, the step-up / step-down ratio N is calculated as in FIG. 5A. In the examples shown in FIG. 5B and FIG. 5C, the number of battery cells 210 included in the discharge battery cell group is equal to or less than the number of battery cells 210 included in the charge battery cell group. N is 1 or more. Therefore, in this case, the transformation control unit 160 outputs the transformation signal S3 that boosts the first voltage and converts it to the second voltage.

  The transformer 170 converts the first voltage applied to the first terminal pair 110 into the second voltage based on the transform signal S3. Then, the transformer 170 applies the converted second voltage to the second terminal pair 120. Here, the transformer 170 electrically insulates between the first terminal pair 110 and the second terminal pair 120. As a result, the transformer unit 170 has the absolute voltage of the negative terminal of the battery cell 210 located most downstream in the discharge battery cell group and the negative terminal of the battery cell 210 located most downstream in the charge battery cell group. Prevents short circuit due to difference from absolute voltage. Furthermore, as described above, the transformer unit 170 converts the first voltage, which is the total voltage of the discharge battery cell group, into the second voltage based on the transformation signal S3.

  In addition, for example, an insulation type DC (Direct Current) -DC converter or the like can be used for the transformer unit 170. In this case, the transformation control unit 160 controls the second voltage converted by the transformation unit 170 by outputting a signal for controlling the ON / OFF ratio (duty ratio) of the isolated DC-DC converter as the transformation signal S3. To do. Insulated DC-DC converters include flyback, forward, RCC (Ringing Choke Converter), push-pull, half-bridge, and full-bridge methods. An appropriate method is selected according to the size.

  FIG. 6 shows the configuration of the transformer 170 using an insulation type DC-DC converter. The insulated DC-DC converter 172 includes a switch unit 174 and a transformer unit 176. The switch unit 174 is a switch for switching ON / OFF of the operation of the isolated DC-DC converter, and is realized using, for example, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), a bipolar transistor, or the like. Further, the switch unit 174 periodically switches between the ON state and the OFF state of the insulation type DC-DC converter 172 based on the transformation signal S3 that is output from the transformation control unit 160 and controls the ON / OFF ratio. Note that the switch unit 174 can have various configurations depending on the type of the insulation type DC-DC converter used. The transformer unit 176 converts the first voltage applied from the first terminal pair 110 into a second voltage. Specifically, the transformer unit 176 operates in conjunction with the ON / OFF state of the switch unit 174, and converts the first voltage into the second voltage according to the ON / OFF ratio. This second voltage increases as the time for which the switch is turned on in the switching period of the switch unit 174 is longer. On the other hand, the second voltage becomes smaller as the time for which the ON state is turned on is shorter in the switching period of the switch unit 174. Note that, within the transformer unit 176, the first terminal pair 110 and the second terminal pair 120 are insulated from each other.

  A processing flow of the power storage device 10 in the present embodiment will be described with reference to FIG. FIG. 7 is a flowchart showing a process flow of the power storage device 10.

  First, the power storage device 10 acquires a voltage measured for each of the plurality of battery cells 210 (S102). And the electrical storage apparatus 10 determines whether the start conditions of the operation | movement which arranges the voltage of the several battery cell 210 are satisfy | filled (S104). The start condition can be, for example, whether or not the difference between the maximum value and the minimum value of the voltage measured for each of the plurality of battery cells 210 is equal to or greater than a predetermined threshold. When this start condition is not satisfied (S104: NO), the voltage of each battery cell 210 is balanced, and the power storage device 10 does not execute the subsequent processing. On the other hand, when the start condition is satisfied (S104: YES), the power storage device 10 executes a process of aligning the voltages of the battery cells 210. In this process, the power storage device 10 determines whether each battery cell 210 is a high voltage cell or a low voltage cell based on the measured voltage for each cell (S106). And the electrical storage apparatus 10 determines a discharge battery cell group and a charge battery cell group based on a determination result (S108). Furthermore, the power storage device 10 sets the determined discharge battery cell group as the connection destination of the first terminal pair 110 and the first control signal S1 that sets the determined discharge battery cell group as the connection destination of the second terminal pair 120. A second control signal S2 to be set is generated (S110). The power storage device 10 outputs the generated first control signal S1 and second control signal S2 to the first switching unit 140 and the second switching unit 150, respectively. The first switching unit 140 connects the first terminal pair 110 and the discharge battery cell group, and the second switching unit 150 connects the second terminal pair 120 and the discharge battery cell group (S112). In addition, the power storage device 10 generates the transformation signal S3 based on the number of battery cells 210 included in the discharge battery cell group and the number of battery cells 210 included in the charge battery cell group (S114). And the electrical storage apparatus 10 converts the 1st voltage applied to the 1st terminal pair 110 into a 2nd voltage based on the transformation signal S3, and applies it to the 2nd terminal pair 120 (S116). Thereby, the electric charge of the discharge battery cell group is moved to the charge battery cell group.

  As described above, according to the present embodiment, when the charge is transferred from the discharge battery cell group to the charge battery cell group, the charge is temporarily accumulated from the discharge battery cell group and then released to the charge battery cell group as in the capacitor system. No configuration is required. Thereby, the charge transfer efficiency per unit time can be improved. Moreover, the discharge battery cell group and the charge battery cell group are individually switched by the first switching unit 140 and the second switching unit 150. Furthermore, the first voltage applied to the first terminal pair 110 by the transformer 170 based on the number of battery cells 210 included in the discharge battery cell group and the number of battery cells 210 included in the charge battery cell group. Is converted to a second voltage and applied to the second terminal pair. Thereby, no matter how the discharge-side and charge-side battery cells 210 are selected, the movement of charges can be realized without any problem.

(Modification)
In the above-described embodiment, the example in which the transformation signal is generated based on the number of the battery cells 210 included in the discharge battery cell group and the number of the battery cells 210 included in the charge battery cell group has been described. In this modification, a case where the transformation signal S3 is generated based on the total voltage of the battery cells 210 included in the discharge battery cell group and the total voltage of the battery cells 210 included in the charge battery cell group will be described.

  The voltage transformation control unit 160 controls the operation of the voltage transformation unit 170 based on the total voltage of the battery cells 210 included in the discharge battery cell group and the total voltage of the battery cells 210 included in the charge battery cell group. Is generated. Further, the transformation control unit 160 outputs the generated transformation signal S3 to the transformation unit 170. In the present modification, when the total voltage of the battery cells 210 included in the discharge battery cell group is higher than the total voltage of the battery cells 210 included in the charge battery cell group, excessive charging is performed with respect to the charge battery cell group. It is necessary to prevent voltage from being applied. Therefore, the transformation control unit 160 outputs a transformation signal S3 that controls the transformation unit 170 so as to step down the first voltage within a range in which the rechargeable battery cell group can be charged. In addition, when the total voltage of the battery cells 210 included in the discharge battery cell group is equal to or lower than the total voltage of the battery cells 210 included in the charge battery cell group, a charge voltage necessary for charging the charge battery cell group is secured. There is a need to. Therefore, the transformation control unit 160 outputs a transformation signal S3 that controls the transformation unit 170 so as to boost the first voltage within a range where an excessive charging voltage is not applied to the rechargeable battery cell group. In addition, the voltage value used as the excessive charging voltage can be determined in view of the product specifications of the battery cell 210 used in the battery unit 200. The voltage boosted and stepped down by the transformer 170 is applied to the second terminal pair 120 as the second voltage.

  Here, an operation example of the transformation control unit 160 in the modification will be described with reference to FIG. FIG. 8 is a diagram for explaining an operation example of the transformation control unit 160 in the modification. In the example shown in FIG. 8A, three continuous high voltage cells A to C and one low voltage cell D are connected in series. In this case, as described with reference to FIG. 2, the switching control unit 130 determines the high voltage cells A to C as the discharge battery cell group and the low voltage cell D as the charge battery cell group. And the transformation control part 160 is based on the ratio of the total voltage of the battery cells 210 included in the charging electric cell group when the total voltage of the battery cells 210 included in the discharge battery cell group is used as a reference. The voltage step-up / down ratio N is calculated. Here, as shown in FIG. 8A, when the total voltage of the battery cells 210 included in the discharge battery cell group is larger than the total voltage of the battery cells 210 included in the charge battery cell group, the charge battery cell group An excessive voltage may be applied to the battery cell 210 included in the battery cell 210 via the second terminal pair 120. Therefore, in the case as shown in FIG. 8A, it is necessary to step down the second voltage applied to the second terminal pair 120 from the first voltage. Furthermore, in order to charge the rechargeable battery cell group, the second voltage needs to be larger than the total voltage of the battery cells 210 included in the rechargeable battery cell group. Therefore, similarly to the case where the above-described number is used, the transformation control unit 160 uses the total voltage of the battery cells 210 included in the discharge battery cell group as a reference for the battery cells 210 included in the charge electric cell group. The step-up / step-down ratio N is set slightly larger than the total voltage ratio.

  Also in the examples shown in FIG. 8B and FIG. 8C, the step-up / step-down ratio N is calculated as in FIG. 8A. In the example shown in FIG. 8B and FIG. 8C, the total voltage of the battery cells 210 included in the discharge battery cell group is equal to or lower than the total voltage of the battery cells 210 included in the charge battery cell group. The step-up / step-down ratio N is 1 or more. Therefore, in this case, the transformation control unit 160 outputs the transformation signal S3 that boosts the first voltage and converts it to the second voltage.

  As described above, the same effects as those of the above-described embodiment can be obtained even in the present modification.

  As mentioned above, although embodiment of this invention was described with reference to drawings, these are the illustrations of this invention, Various structures other than the above are also employable.

  For example, in the above-described embodiments and modifications, the case where the step-up / step-down ratio of the transformer 170 is variable has been described as an example. However, the step-up / step-down ratio of the transformer 170 may be a fixed value. In this case, the transformer 170 has coils that are inductively coupled to each other on the first terminal pair 110 side and the second terminal pair 120 side, respectively, and a step-up / step-down ratio having a predetermined value is set according to the turns ratio of the coils. Can be obtained. For example, if the number of turns of the coil on the second terminal pair 120 side is N times the number of turns of the coil on the first terminal pair 110 side, the voltage input from the first terminal pair 110 is boosted N times. And output from the second terminal pair 120. Hereinafter, an operation when the step-up / step-down ratio of the transformer 170 is a fixed value will be described with reference to FIGS. 9 and 10.

  FIG. 9 is a diagram for explaining the step-up / step-down ratio of the transformer unit 170 in another modified example. As shown in FIG. 9, in the transformer unit 170, the first terminal pair 110 is set as an input and the second terminal pair 120 is set as an output as a first direction. In the first direction, it is assumed that the input voltage is boosted at the step-up / step-down ratio N by the turn ratio of the coil on the first terminal pair 110 side and the coil on the second terminal pair 120 side. Here, a case is considered in which the second terminal pair 120 is input and the first terminal pair 110 is output in the direction opposite to the first direction. In this case, the step-up / step-down ratio due to the turn ratio of the coil on the first terminal pair 110 side and the coil on the second terminal pair 120 side is 1 / N of the reciprocal number. Thus, even if the step-up / step-down ratio of the transformer unit 170 is fixed, two types of step-up / step-down ratios can be realized by using the transformer unit 170 in both directions.

  FIG. 10 is a diagram for specifically explaining the operation in another modified example. In FIG. 10, it is assumed that the step-up / step-down ratio in the first direction of the transformer unit 170 is 3. FIG. 10A is a diagram illustrating the operation of the transformer unit 170 in the first direction. In the case of FIG. 10A, the step-up / step-down ratio of the transformer 170 is 3, and three low-voltage cells connected in series can be charged for each high-voltage cell. That is, in the case shown in FIG. 10A, 3 × m cells connected in series using m (m is a positive integer) high voltage cells (discharge battery cell group) connected in series. The low voltage cell (rechargeable battery cell group) can be charged. FIG. 10B is a diagram illustrating the operation of the transformer unit 170 in the direction opposite to the first direction. In this case, the step-up / step-down ratio of the transformer 170 is 1/3, and one low voltage cell can be charged for every three high voltage cells connected in series. That is, in the case as shown in FIG. 10B, m cells connected in series using 3 × m (m is a positive integer) high voltage cells (discharge battery cell group) connected in series. The low voltage cell (rechargeable battery cell group) can be charged. Therefore, the transformation control unit 160 monitors the ratio between the discharge battery cell group and the charge battery cell group, and according to the ratio, the discharge battery cell group and the charge battery cell group, the first terminal pair 110 and the first terminal pair. The connection state with the two-terminal pair 120 may be controlled. Even if it does in this way, the effect similar to the above-mentioned embodiment can be acquired.

  Moreover, in the flowchart used by the above-mentioned description, although several process (process) is described in order, the execution order of the process performed by each embodiment is not restrict | limited to the description order.

Hereinafter, examples of the reference form will be added.
1. A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the number of the battery cells included in the discharge battery cell group and the number of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
A power storage device.
2. A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the total voltage of the battery cells included in the discharge battery cell group and the total voltage of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
A power storage device.
3. The transformation control means includes
When the number of the battery cells included in the discharge battery cell exceeds the number of the battery cells included in the rechargeable battery cell, the first voltage is stepped down based on the number as the transformation signal. Generate a signal that converts to two voltages,
When the number of the battery cells included in the discharge battery cell is equal to or less than the number of the battery cells included in the rechargeable battery cell, the first voltage is boosted based on the number as the transformation signal, Generating a signal to be converted to a second voltage;
1. The power storage device described in 1.
4). The transformation control means includes
When the total voltage of the battery cells included in the discharge battery cell exceeds the total voltage of the battery cells included in the charge battery cell, the first voltage is stepped down based on the total voltage as the transformation signal. To generate a signal to be converted to the second voltage,
When the total voltage of the battery cells included in the discharge battery cell is equal to or lower than the total voltage of the battery cells included in the charge battery cell, the first voltage is boosted based on the total voltage as the transformation signal. A signal to be converted into the second voltage.
2. The power storage device described in 1.
5. The transformer means is an insulated DC (Direct Current) -DC converter,
The transformation control means generates a signal for controlling ON / OFF of the insulated DC-DC converter as the transformation signal.
1. To 4. The electrical storage apparatus as described in any one of these.
6). A battery control device for aligning voltages of a plurality of battery cells connected in series,
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the number of the battery cells included in the discharge battery cell group and the number of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
A battery control device.
7). A battery control device for aligning voltages of a plurality of battery cells connected in series,
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the total voltage of the battery cells included in the discharge battery cell group and the total voltage of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
A battery control device.
8). The transformation control means includes
When the number of the battery cells included in the discharge battery cell exceeds the number of the battery cells included in the rechargeable battery cell, the first voltage is stepped down based on the number as the transformation signal. Generate a signal that converts to two voltages,
When the number of the battery cells included in the discharge battery cell is equal to or less than the number of the battery cells included in the rechargeable battery cell, the first voltage is boosted based on the number as the transformation signal, Generating a signal to be converted to a second voltage;
6). The battery control device described in 1.
9. The transformation control means includes
When the total voltage of the battery cells included in the discharge battery cell exceeds the total voltage of the battery cells included in the charge battery cell, the first voltage is stepped down based on the total voltage as the transformation signal. To generate a signal to be converted to the second voltage,
When the total voltage of the battery cells included in the discharge battery cell is equal to or lower than the total voltage of the battery cells included in the charge battery cell, the first voltage is boosted based on the total voltage as the transformation signal. A signal to be converted into the second voltage.
7). The battery control device described in 1.
10. The transformer means is an insulated DC (Direct Current) -DC converter,
The transformation control means generates a signal for controlling ON / OFF of the insulated DC-DC converter as the transformation signal.
6). To 9. The battery control device according to any one of the above.
11. A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
Preparing a second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group; ,
Battery control device
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And outputting a second control signal with the connection destination of the second terminal pair as the determined rechargeable battery cell group,
In accordance with the first control signal, a connection destination of the first terminal pair is set,
In accordance with the second control signal, a connection destination of the second terminal pair is set,
Outputting a transformation signal based on the number of the battery cells included in the discharge battery cell group and the number of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Applying a voltage to the second terminal pair;
A battery control method.
12 A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
Preparing a second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group; ,
Battery control device
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And outputting a second control signal with the connection destination of the second terminal pair as the determined rechargeable battery cell group,
In accordance with the first control signal, a connection destination of the first terminal pair is set,
In accordance with the second control signal, a connection destination of the second terminal pair is set,
Output a transformation signal based on the total voltage of the battery cells included in the discharge battery cell group and the total voltage of the battery cells included in the charge battery cell group,
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Applying a voltage to the second terminal pair;
A battery control method.
13. The battery control device is
When the number of the battery cells included in the discharge battery cell exceeds the number of the battery cells included in the rechargeable battery cell, the first voltage is stepped down based on the number as the transformation signal. Generate a signal that converts to two voltages,
When the number of the battery cells included in the discharge battery cell is equal to or less than the number of the battery cells included in the rechargeable battery cell, the first voltage is boosted based on the number as the transformation signal, Generating a signal to be converted to a second voltage;
11. Including The battery control method described in 1.
14 The battery control device is
When the total voltage of the battery cells included in the discharge battery cell exceeds the total voltage of the battery cells included in the charge battery cell, the first voltage is stepped down based on the total voltage as the transformation signal. To generate a signal to be converted to the second voltage,
When the total voltage of the battery cells included in the discharge battery cell is equal to or lower than the total voltage of the battery cells included in the charge battery cell, the first voltage is boosted based on the total voltage as the transformation signal. A signal to be converted into the second voltage.
Including. The battery control method described in 1.
15. The means for converting the first voltage into the second voltage is an isolated DC (Direct Current) -DC converter,
The battery control device generates a signal for controlling ON / OFF of the insulated DC-DC converter as the transformation signal.
11. Including To 14. The battery control method according to any one of the above.

DESCRIPTION OF SYMBOLS 10 Power storage device 110 1st terminal pair 110a terminal 110b terminal 120 2nd terminal pair 120a terminal 120b terminal 130 Switching control part 140 1st switching part 141 Switching switch 142a Bus 142b Bus 143 Switching switch pair 143a 1st switch 143b 2nd switch 144a Bus 144b Bus 150 Second switching unit 151 Changeover switch 152 Current control switch 152a First switch pair 152b Second switch pair 153a Bus 153b Bus 154 Changeover switch pair 154a First switch 154b Second switch 155a Bus 155b Bus 160 Transformer control unit 170 Transformer unit 172 Insulation type DC-DC converter 174 Switch unit 176 Transformer unit 200 Battery unit 210 Battery cell S1 First control signal S2 Second control signal S3 Variable Signal

Claims (12)

A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the number of the battery cells included in the discharge battery cell group and the number of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
A power storage device. A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the total voltage of the battery cells included in the discharge battery cell group and the total voltage of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
A power storage device. The transformation control means includes
When the number of the battery cells included in the discharge battery cell exceeds the number of the battery cells included in the rechargeable battery cell, the first voltage is stepped down based on the number as the transformation signal. Generate a signal that converts to two voltages,
When the number of the battery cells included in the discharge battery cell is equal to or less than the number of the battery cells included in the rechargeable battery cell, the first voltage is boosted based on the number as the transformation signal, Generating a signal to be converted to a second voltage;
The power storage device according to claim 1. The transformation control means includes
When the total voltage of the battery cells included in the discharge battery cell exceeds the total voltage of the battery cells included in the charge battery cell, the first voltage is stepped down based on the total voltage as the transformation signal. To generate a signal to be converted to the second voltage,
When the total voltage of the battery cells included in the discharge battery cell is equal to or lower than the total voltage of the battery cells included in the charge battery cell, the first voltage is boosted based on the total voltage as the transformation signal. A signal to be converted into the second voltage.
The power storage device according to claim 2. The transformer means is an insulated DC (Direct Current) -DC converter,
The transformation control means generates a signal for controlling ON / OFF of the insulated DC-DC converter as the transformation signal.
The power storage device according to any one of claims 1 to 4. A battery control device for aligning voltages of a plurality of battery cells connected in series,
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the number of the battery cells included in the discharge battery cell group and the number of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
A battery control device. A battery control device for aligning voltages of a plurality of battery cells connected in series,
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
A second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group;
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And a switching control means for outputting a second control signal for setting the connection destination of the second terminal pair as the determined rechargeable battery cell group;
First switching means for setting a connection destination of the first terminal pair in response to the first control signal;
Second switching means for setting a connection destination of the second terminal pair in response to the second control signal;
A transformation control means for outputting a transformation signal based on the total voltage of the battery cells included in the discharge battery cell group and the total voltage of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Transforming means for applying a voltage to the second terminal pair;
A battery control device. The transformation control means includes
When the number of the battery cells included in the discharge battery cell exceeds the number of the battery cells included in the rechargeable battery cell, the first voltage is stepped down based on the number as the transformation signal. Generate a signal that converts to two voltages,
When the number of the battery cells included in the discharge battery cell is equal to or less than the number of the battery cells included in the rechargeable battery cell, the first voltage is boosted based on the number as the transformation signal, Generating a signal to be converted to a second voltage;
The battery control device according to claim 6. The transformation control means includes
When the total voltage of the battery cells included in the discharge battery cell exceeds the total voltage of the battery cells included in the charge battery cell, the first voltage is stepped down based on the total voltage as the transformation signal. To generate a signal to be converted to the second voltage,
When the total voltage of the battery cells included in the discharge battery cell is equal to or lower than the total voltage of the battery cells included in the charge battery cell, the first voltage is boosted based on the total voltage as the transformation signal. A signal to be converted into the second voltage.
The battery control device according to claim 7. The transformer means is an insulated DC (Direct Current) -DC converter,
The transformation control means generates a signal for controlling ON / OFF of the insulated DC-DC converter as the transformation signal.
The battery control apparatus of any one of Claim 6 to 9. A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
Preparing a second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group; ,
Battery control device
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And outputting a second control signal with the connection destination of the second terminal pair as the determined rechargeable battery cell group,
In accordance with the first control signal, a connection destination of the first terminal pair is set,
In accordance with the second control signal, a connection destination of the second terminal pair is set,
Outputting a transformation signal based on the number of the battery cells included in the discharge battery cell group and the number of the battery cells included in the charge battery cell group;
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Applying a voltage to the second terminal pair;
A battery control method. A plurality of battery cells connected in series;
One terminal is connected to a positive electrode terminal of a discharge battery cell group including one or more of the battery cells, and the other terminal is connected to a negative electrode terminal of the discharge battery cell group;
Preparing a second terminal pair in which one terminal is connected to a positive electrode terminal of a rechargeable battery cell group including one or more battery cells, and the other terminal is connected to a negative electrode terminal of the rechargeable battery cell group; ,
Battery control device
A first control signal that determines the discharge battery cell group and the charge battery cell group based on the voltages of the plurality of battery cells and sets the connection destination of the first terminal pair as the determined discharge battery cell group And outputting a second control signal with the connection destination of the second terminal pair as the determined rechargeable battery cell group,
In accordance with the first control signal, a connection destination of the first terminal pair is set,
In accordance with the second control signal, a connection destination of the second terminal pair is set,
Output a transformation signal based on the total voltage of the battery cells included in the discharge battery cell group and the total voltage of the battery cells included in the charge battery cell group,
The first voltage applied to the first terminal pair is converted into a second voltage based on the transformed signal while insulating the first terminal pair and the second terminal pair, and the converted second voltage Applying a voltage to the second terminal pair;
A battery control method.

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