JP2008182876A - Battery pack capacity adjustment method and apparatus - Google Patents

Abstract

The present invention provides a method capable of performing capacity adjustment in a short time without overheating a control board by appropriately controlling the amount of heat generated during capacity adjustment.
An assembled battery having a plurality of secondary batteries, and a control board on which an integrated circuit for controlling the plurality of secondary batteries, a control circuit and a capacity adjusting means for each secondary battery are mounted. In this capacity adjustment method, the capacity of each secondary battery is adjusted by the voltage value, and the maximum number of secondary batteries whose capacity should be adjusted according to the relationship between the heat dissipation amount of the control board 15 and the heat generation amount of the resistor 152 is determined. And a step of controlling the capacity adjusting means for the maximum number of secondary batteries determined in this step to adjust the capacity of each secondary battery.
[Selection] Figure 2

Description

  The present invention relates to a method and an apparatus for adjusting the capacity of an assembled battery including a plurality of secondary batteries.

  In an assembled battery formed by connecting a plurality of unit cells (secondary cells), if charging / discharging is repeated or left unattended, a difference in capacity occurs due to variation in characteristics of each unit cell. If an assembled battery is used in a state where such a capacity difference occurs, a unit cell that is overcharged or overdischarged occurs, and the life of the entire assembled battery is shortened. For this reason, the capacity | capacitance of each single battery is equalized by predetermined frequency.

  By the way, a lithium ion secondary battery using lithium cobaltate for the positive electrode and carbon for the negative electrode, or a lithium secondary battery using lithium cobaltate for the positive electrode and lithium metal for the negative electrode (hereinafter collectively referred to as lithium secondary batteries). In this case, an organic solvent such as ethylene carbonate is used for the electrolyte, so when overcharged, the organic solvent decomposes and vaporizes, and the secondary battery housing expands abnormally or is an electrolyte. Since the organic solvent is vaporized, the charging capacity is extremely reduced at the next charging.

For this reason, in the assembled battery of lithium secondary batteries, a method is adopted in which the capacity of each unit cell is made uniform by discharging the unit cell having a larger capacity than the others. The capacity adjustment of the single cells is performed by discharging capacity adjustment bypass resistors connected in parallel to the single cells for a time corresponding to the adjustment capacity.

  However, if a large number of capacitance adjusting bypass resistors are discharged, the amount of heat generated by the discharge becomes excessive, which may adversely affect electronic components such as a CPU mounted on the control board adjacent to the bypass resistors. For this reason, as described in Patent Document 1, for example, when the temperature of the substrate on which the capacity adjustment bypass resistor is mounted exceeds a threshold value, it is proposed to stop the capacity adjustment of the single battery with less variation in charge capacity. Yes.

  However, since the adjustment method described in Patent Document 1 does not consider the relationship between the cooling effect of the cooling device and the heat generation amount of the bypass resistor, the temperature that guarantees the operation of the electronic component mounted on the control board is maintained. Although it can be done, there is a problem that the capacity adjustment of the unit cell is delayed because the amount of heat generation may be suppressed more than necessary.

JP 2006-73364 A

  The problem to be solved by the present invention is to provide a method and apparatus capable of shortening the capacity adjustment time.

  The battery pack capacity adjustment method of the present invention comprises a control means for controlling a battery pack provided with a plurality of secondary batteries, a capacity adjustment means for each secondary battery, and a control board on which the capacity adjustment means is mounted. A method for adjusting the capacity of an assembled battery is provided. Then, the control means determines the number of secondary batteries whose capacity is adjusted together according to the relationship between the heat dissipation amount of the control board and the heat generation amount of the capacity adjustment means, and controls the capacity adjustment means to determine this Adjust the capacity of each secondary battery.

  In the present invention, when adjusting the capacity of each secondary battery constituting the assembled battery, according to the relationship between the heat dissipation amount of the control board on which the capacity adjustment means as the heat generation source is mounted and the heat generation amount of the capacity adjustment means. The number of secondary batteries whose capacity is adjusted together is determined. Thereby, efficient capacity | capacitance adjustment according to the cooling capacity of a control board can be performed. That is, when the cooling capacity of the control board is large, capacity adjustment is performed for a large number of secondary batteries together. On the other hand, when the cooling capacity is small, the capacity is adjusted together for a small number of secondary batteries corresponding thereto. Thereby, the time required for capacity adjustment can be shortened without suppressing the temperature of the control board more than necessary.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a block diagram showing an embodiment of a capacity adjustment device according to the present invention, FIG. 2 is a flowchart showing an example of the operation of the capacity adjustment device according to the present invention, and FIG. 6 is an assembled battery including the capacity adjustment device according to the present invention. FIG. 7 is a sectional view showing a configuration example of an assembled battery system including a capacity adjustment device according to the present invention, and FIG. 8 is a perspective view showing an example of a control board according to the present invention.

First, a configuration example and an on-vehicle example of the assembled battery system according to the present invention will be described. The assembled battery unit 1 according to this example is mounted in a trunk room B1 of a vehicle B as shown in FIG. In the example shown in the figure, in order to introduce cooling air into the assembled battery unit 1, an opening B 3 is formed in the rear parcel panel B 2 of the vehicle, and air inside the vehicle compartment is passed through the duct 19 from here inside the unit 1. To be introduced. In the present invention, the position where the assembled battery unit 1 is mounted is not limited to the example shown in the figure, and can be mounted in the vehicle interior, under the floor, in the engine room, and the like.

As shown in FIG. 7, the assembled battery unit 1 of this example is a battery pack 11 in which a plurality of thin secondary batteries are stacked and positive and negative terminals are connected in series, and a plurality of (4 in FIG. 1) Stack and connect positive and negative terminals at both ends in series. Then, the battery packs 11 stacked in this way are arranged in a plurality of rows (three rows in the figure), and positive and negative terminals at both ends are connected in series, and end plates 12 and 12 are provided on the top and bottom and fixed with bolts 13 or the like. .

Further, in the upper end plate 12, a control board 15 for controlling each secondary battery 14 (secondary battery 14 itself is shown in FIG. 1) constituting the assembled battery is housed in a case 16. It is attached. The control board 15 is a printed board on which an integrated circuit 151 that is an electronic component for controlling each secondary battery 14 constituting the assembled battery, a resistor 152 for adjusting the capacity, and the like are mounted.

An overview of the control board 15 is shown in FIG. 8. An integrated circuit (IC chip) 151 for controlling each secondary battery 14 and each secondary battery 14 are provided on the front and back sides of the printed board 153 on which the wiring pattern is formed. Resistors 152 which are electronic components for performing capacitance adjustment are mounted in a matrix. FIG. 8 shows twelve integrated circuits 151 and twelve resistors 152 for convenience, but when the assembled battery unit 1 is composed of, for example, sixty thin secondary batteries 14, each secondary Sixty resistors 152 and sixty integrated circuits for adjusting the capacity of the battery 14 are mounted on the printed circuit board 153. This is shown in FIG. In FIG. 8, 154 is a connector provided with an input / output terminal, and 155 is a control circuit (IC chip) for controlling the entire assembled battery.

Returning to FIG. 7, the plurality of battery packs 11 held by the upper and lower end plates 12, 12 are accommodated in the assembled battery case 17. The assembled battery case 17 is formed with an inlet 171 for taking in air in the vehicle interior and an outlet 172 for discharging the air taken into the assembled battery case 17. The intake fan 171 has a suction fan. A duct 19 provided with 18 is connected. The upper end of the duct 19 is connected to the opening B3 of the rear parcel panel B2 of the vehicle B described above.

Since the secondary battery generates heat during charging or the like, an air intake fan 18 is operated to cool the secondary battery 14 stored in the battery pack 11 and the air (cooling air) in the vehicle compartment is assembled into a battery case. 17 inside. The air taken in from the inlet 171 of the assembled battery case 17 mainly cools the secondary battery 14 while passing through the gaps in the battery pack 11 and is discharged from the outlet 172. It also functions to cool the control board 15 provided on the plate 12. In this case, air is taken into the case 16 by forming openings 161 at both ends in the air flow direction of the case 16 that houses the control board 15. The capacity adjustment resistor 152 mounted on the control board 15 is also cooled by the air. However, since the amount of air flowing into the case 16 cannot be controlled, each secondary by the capacity adjustment resistor 152 is controlled in this example. The capacity adjustment of the battery 14 is performed as follows.

First, an example of the electrical configuration of the assembled battery unit 1 that is a target of the capacity adjustment method and apparatus according to the present invention will be described with reference to FIG.

The assembled battery unit 1 of this example includes a plurality of secondary batteries 14 connected in series, and a vehicle load 2 such as a starter motor or a drive motor of an electric vehicle is connected to both ends thereof.

On the other hand, each secondary battery 14 includes a voltage detection circuit 151a that detects the voltage value of each secondary battery 14 and sends it to the control circuit 155, and adjusts the capacity of each secondary battery 14. A capacitance adjusting circuit 152 composed of a resistor or the like is connected. The voltage detection circuit 151a is incorporated in, for example, the integrated circuit 151 shown in FIG. Note that the isolation circuit 155a illustrated in FIG. 1 transmits signals between the voltage detection circuit 151a and the capacity adjustment circuit 152 provided in each of the plurality of secondary batteries 14 and the control circuit 155, for example, a photocoupler or the like. 8 is an insulating transmission circuit that performs electrical insulation while using, for example, incorporated in an integrated circuit 155 shown in FIG.

In this example, a cooling medium temperature sensor 3A for detecting the temperature of the cooling air is provided in the duct 19 or the vehicle interior, and a sensor 3B for detecting the rotation speed of the suction fan 18 is provided, and the temperature is detected by the cooling medium temperature sensor 3A. The cooling air temperature and the rotational speed detected by the suction fan rotational speed sensor 3B are sent to the control circuit 155.

Further, in order to indirectly determine the heat dissipation amount of the control board 15, two secondary battery temperature sensors 3C for determining the heat generation amount of the secondary battery 14 are provided in the case 16 of the assembled battery unit 1. The temperature Tb of the secondary battery 14 detected by the secondary battery temperature sensor 3C is sent to the control circuit 155. The temperature Tb detected by the secondary battery temperature sensor 3C is for obtaining the heat generation amount Qi of the secondary battery 14, and energy Gb obtained by subtracting the heat generation amount Qi of the secondary battery from the heat dissipation amount Q0 of the suction fan 18 (= Q0−Qi) is the cooling energy of the control board 15.

Incidentally, instead of the secondary battery temperature sensor 3C, a temperature sensor Y for detecting the temperature of the control board 15 is provided, for example, at an appropriate place (shown in FIG. 8) of the printed board 153, and the integrated circuit 151 and the control circuit are provided. The temperature near 155 may be directly measured, and the cooling energy (heat radiation amount) of the control board 15 may be obtained from this temperature.

In FIG. 1, reference numeral 4 denotes a total voltage sensor that detects the entire voltage value of the assembled battery 1, reference numeral 5 denotes a current sensor that detects a current flowing through the entire assembled battery 1, and reference numeral 3D supplies drive power to the control circuit 155. It is an auxiliary battery.

Particularly in this example, the capacity is adjusted simultaneously according to the relationship between the temperature and the amount of cooling air flowing through the control board 15, in other words, the amount of heat released from the control board 15 and the amount of heat generated from the capacity adjustment circuit (resistor) 152. The maximum number of secondary batteries 14 that can be determined is determined. That is, as a result of surplus current flowing through the resistor 152 due to capacitance adjustment, the resistor 152 generates heat, which may cause the integrated circuit 151 and the control circuit 155 mounted on the control board 15 to exceed the limit temperature. When the heat dissipation amount of the control board 15 is large (in other words, the cooling energy for the control board 15 is large), the heat generation from the resistor 152 can be absorbed even if the capacity of a large number of secondary batteries is adjusted at the same time. In addition, the capacity can be adjusted efficiently without the control circuit 155 being overheated. Further, when the heat dissipation amount of the control board 15 is small (in other words, the cooling energy for the control board 15 is small), the number of simultaneous adjustments according to the cooling capacity is set, so that the integrated circuit 151 and the control circuit 155 overheating can be prevented.

Regarding the setting of the simultaneous capacity adjustment number based on the cooling energy, the cooling air flowing to the control board 15 is taken from the room, so that the temperature of the cooling air is set to the temperature detected by the cooling medium temperature sensor 3A, and the control board 15 Since the flow rate of the cooling air flowing in relation to the intake air 18 correlates with the rotational speed of the suction fan 18, the air flow is calculated based on the rotational speed of the suction fan 18 (may be obtained from a preset map or the like). On the other hand, the capacity to be adjusted in each secondary battery 14 is calculated from the deviation between the current charge capacity and the target value of each secondary battery 14 whose capacity is to be adjusted, and then the amount of heat generated in the resistor 152 is obtained. .

Then, the maximum number of secondary batteries 14 whose capacity is adjusted simultaneously is determined based on the relationship between the combination state of these temperatures and the rotational speed of the suction fan 18 and the amount of heat generated in the resistor 152.

For example, when the temperature of the cooling air is high and the suction fan 18 is rotating at a low speed, the cooling capacity of the control board 15 is the smallest. At this time, if the adjustment capacity of each secondary battery 14 is large, the maximum number of secondary batteries 14 whose capacity can be adjusted simultaneously becomes small, but if the adjustment capacity is small, the maximum number of secondary batteries 14 whose capacity is adjusted simultaneously is small. The number of secondary batteries 14 is not limited to a small number and can be adjusted simultaneously. In the conventional capacity adjustment method as disclosed in Patent Document 1 and the like, only the heat dissipation amount of the control board 15 (in other words, the cooling effect) is considered, and therefore, when the cooling effect is small, a small number of secondary batteries are simultaneously used. However, according to the method of this example, the adjustment capacity is small even if the cooling effect is small (in other words, the amount of heat generated by the resistor 152 is small). Since more secondary batteries can be adjusted simultaneously, capacity adjustment can be performed in a short time.

In addition to the relationship between the cooling capacity for the control board 15 and the adjustment capacity, the overall capacity adjustment time is affected by the capacity adjustment time of the secondary battery 14, so the maximum number is obtained and the capacity adjustment is finally performed. In selecting the power secondary battery 14, the secondary battery 14 is preferentially selected from those having a large deviation between the capacity of each secondary battery and the target charge capacity value (in other words, having a long capacity adjustment time).

In addition, since the rotation speed of the suction fan 18 is controllable, you may comprise so that the heat release amount of the control board 15 may be calculated only from the temperature of a cooling medium, and the rotation speed of the suction fan 18 may be controlled.

Further, in obtaining the heat radiation amount of the control board 15 (cooling energy for the control board 15), the cooling energy by the suction fan 18 and the heat generation amount from the secondary battery 14 are obtained, and the secondary battery 14 is obtained from the cooling energy by the suction fan 18. It may be obtained by reducing the cooling energy used in the process.

Next, the capacity adjustment method of this example will be described.

As shown in FIG. 2, it is determined in step ST10 whether the capacity adjustment mode is set. The timing of the capacity adjustment is not particularly limited, and examples thereof include a time when the vehicle is started and a time when the vehicle is stopped. Of course, the capacity can be adjusted even when the vehicle is running.

In step ST20, the voltage detection circuit 151a of each secondary battery 14 constituting the assembled battery 1 is used to capture the capacity of each secondary battery 14 at the voltage value Vc, and the current value I, the cooling medium from the current sensor 5. The cooling air temperature Tr is taken in from the temperature sensor 3A, and the secondary battery temperature Tb is taken in from the secondary battery temperature sensor 3C.

In the next step ST30, the internal resistance R of the secondary battery is calculated from the secondary battery voltage Vc, current value I, and secondary battery temperature Tb, and the secondary battery 14 is calculated from the obtained internal resistance R and current value I. The calorific value Qi at is calculated. In the next step ST40, the cooling energy (heat radiation amount) Q0 supplied to the entire assembled battery unit 1 is calculated from the cooling air temperature Tr and the rotational speed Nb of the suction fan 18.

Here, since the cooling energy supplied to the entire assembled battery unit 1 is used for cooling the secondary battery 14 and cooling the control board 15, the cooling of the control board 15 is performed in the next step ST50. The cooling energy (heat radiation amount) Qb = Q0−Qi that can be used for the calculation is calculated.

In the next step ST60, the capacity adjustment target voltage Vct is determined from the voltage Vc of each secondary battery 14 captured in step ST20, and the deviation Vchn = Vc between the voltage Vc of each secondary battery 14 and the capacity adjustment target voltage Vct. -Vct is calculated, and the secondary batteries 14 are ordered in descending order of the deviation Vchn to determine the priority. Let the ordered voltage value be Vcnk (k = 1, 2, 3,...).

In the next step ST70, the maximum number of secondary batteries 14 whose capacity can be adjusted simultaneously within the range of the heat dissipation amount Qb of the control board 15 obtained in step ST50 is determined. At this time, the calorific value Qbnk in each resistor 152 is calculated from the voltage Vcnk and the resistance value Rb (known) of the resistor 152 in the order of priority of the secondary batteries 14 ordered in step ST60, and the total ΣQbnk is calculated in step ST50. The maximum k within a range not exceeding the heat dissipation amount Qb of the control board 15 determined in step 1, that is, the maximum kmax satisfying ΣQbnk ≦ Qb is obtained.

In step ST75, the number of rotations of the suction fan 18 may be finely adjusted in consideration of the heat generation amount Qbkmax generated in the resistor 152 when simultaneously adjusting the capacity of the number determined in step ST70.

When the simultaneous adjustment number and order of the secondary batteries 14 whose capacity is to be adjusted are determined, the capacity adjustment of the selected secondary battery 14 is started in step ST80. This operation is executed by sending a capacity adjustment signal from the control circuit 155 shown in FIG. 1 to the capacity adjustment circuit 152 and causing a current to flow through the resistor 152 for a predetermined time.

Next, in step ST90, it is monitored whether or not there is a secondary battery 14 that has finished capacity adjustment. If there is a secondary battery 14 that has finished, the process proceeds to step ST100 and capacity adjustment of all the secondary batteries 14 is finished. If there is a remaining secondary battery 14, the process proceeds to step ST 110 to select the secondary battery 14 in the next order (priority), and then returns to step ST 80 to determine the secondary battery 14. Start capacity adjustment. Then, this routine is repeated, and when the capacity adjustment of all the secondary batteries 14 is finished in step ST100, this process is finished.

Thus, in this example, not only the amount of heat generated in the resistor 152 which is a heat source, but also the temperature and air volume of the cooling medium supplied to the control board 15 on which the resistor 152 is mounted, that is, cooling energy (heat radiation amount). Since the maximum number of the secondary batteries 14 whose capacity should be adjusted simultaneously is determined according to the relationship, the capacity adjustment can be executed efficiently in a short time without overheating the control board 15.

By the way, when a certain time elapses after the assembled battery system is stopped, the control board 15 is also sufficiently cooled, and there is a relationship with the temperature of the cooling medium. The number of will increase. Therefore, in this example, the cooling state of the control board 15 is estimated by determining how long it has been stopped when the assembled battery system is started, and when all the secondary batteries 14 are sufficiently cooled, At the same time, the capacity is adjusted. A control flow of this simultaneous capacity adjustment is shown in FIG. Note that the control shown in the figure is logic inserted before step ST10 of the control flow shown in FIG.

First, in step ST1, the temperature Tb of the secondary battery 14 is taken from the secondary battery temperature sensor 3C, the temperature Tr of the cooling air is taken from the cooling medium temperature sensor 3A, and the total voltage V of the secondary battery 14 is taken from the total voltage sensor 4. Before this, the total voltage Vm when the previous assembled battery system is stopped is stored.

In step ST2, it is determined whether or not the voltage difference Vm-V between the stored previous total voltage Vm and the current total voltage V at the time of activation is greater than a predetermined value V1 (preliminarily determined empirically). If it is larger, it is determined that a voltage difference due to self-discharge during the stop period of the secondary battery 14, that is, a certain time has elapsed, and the process proceeds to the next step ST3. When the voltage difference Vm-V is smaller than V1 in step ST2, it is determined that the predetermined time has not elapsed since the previous system stop, and therefore the control board 15 is not sufficiently cooled, and is shown in FIG. The process jumps to step ST10 and shifts to capacity adjustment control considering the number limit.

In step ST3, based on the relational expression of time Ct1−secondary battery temperature Tb shown in FIG. 4, the time for simultaneous capacity adjustment of all the secondary batteries 14 executed in the next step ST4 is determined. That is, the lower the temperature of the secondary battery 14, the higher the temperature of the control board 15 does not easily reach the limit value even if the capacity is adjusted all at once for a long time, so that the capacity can be adjusted all at once for a long time Ct 1.

In step ST4, the capacity adjustment is executed for all the secondary batteries 14 all at once. At this time, the capacity adjustment is performed on each secondary battery 14 by the difference between each secondary battery 14 and the capacity adjustment target value, and the control is executed to finish the capacity adjustment in order from the secondary battery 14 whose capacity adjustment has been completed. To do.

In step ST5, it is counted whether or not the adjustment time Ct1 set in step ST3 is up, and the simultaneous capacity adjustment in step ST4 is continued until the time is up. Then, when the adjustment time set in step ST3 is up, the process proceeds to step ST10 shown in FIG. 2, and the control shown in FIG.

Thus, when the control shown in FIG. 3 is performed at the time of starting the assembled battery system, the capacity of the assembled battery 1 becomes uniform and the capacity adjustment time can be significantly shortened compared to the case where the capacity adjustment is performed only during steady operation. .

  FIG. 5 is a control flow showing a modification example when stopping the assembled battery system, and there is sufficient voltage Vb of the auxiliary battery 3D that supplies power to the control circuit 155 at the timing of stopping the assembled battery system, and When capacity adjustment is necessary, capacity adjustment is executed even after the assembled battery system is stopped.

That is, in step ST200, it is detected whether or not there is a request for stopping the assembled battery system, and if a system stop request is detected, the following steps are executed. If there is a request to stop the assembled battery system, the voltage Vc of each secondary battery 14 and the voltage Vb of the auxiliary battery 3D are captured in step ST210. In step ST220, it is determined whether there is a variation to be adjusted in the charge capacity of each secondary battery 14 or not. In this example, as an example of the capacity variation, when the voltage difference between the maximum value Vcmax of the voltage Vc of each secondary battery 14 and the capacity adjustment target value Vct is larger than the predetermined value Vcs, there is a variation to be adjusted. (Step ST220). When there is no capacity variation to be adjusted in step ST220, the battery pack system stop process is executed (step ST240) without adjusting the capacity (step ST230).

  If it is determined in step ST220 that there is a variation in capacity, it is determined in step ST250 whether or not auxiliary battery 3D has sufficient voltage V1 to execute capacity adjustment, and if sufficient, the process returns to step ST260. If not enough, the process proceeds to step ST230.

  In steps ST260 to ST310, the same capacity adjustment processing as steps ST20 to ST110 shown in FIG. 2 is executed.

  In this example, when the assembled battery system is stopped, the necessary capacity adjustment is performed as long as the voltage of the auxiliary battery 3D is sufficient. Therefore, when the system is started next time, it operates as the assembled battery system in the adjusted state. be able to.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

It is a block diagram which shows embodiment of the capacity | capacitance adjustment apparatus of this invention. It is a flowchart which shows operation | movement of the capacity | capacitance adjustment apparatus of this invention. It is a flowchart which shows operation | movement of the other example of the capacity | capacitance adjustment apparatus of this invention. 4 is a control map of capacity adjustment time-secondary battery temperature in the example shown in FIG. It is a flowchart which shows operation | movement of the other example of the capacity | capacitance adjustment apparatus of this invention. It is a conceptual diagram which shows the vehicle-mounted example of the assembled battery which concerns on this invention. It is sectional drawing which shows the structural example of the assembled battery which concerns on this invention. It is a perspective view which shows an example of the control board which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Battery pack 11 ... Battery pack 14 ... Secondary battery 15 ... Control board 151 ... Integrated circuit (electronic component)
152. Capacity adjusting circuit (capacitance adjusting means)
153 ... Printed circuit board 154 ... Connector 155 ... Control circuit (control means)
16 ... Case 17 ... Case 18 ... Suction fan 19 ... Duct 2 ... Vehicle load 3A ... Cooling medium temperature sensor 3B ... Suction fan rotation speed sensor 4 ... Total voltage sensor 5 ... Current sensor

Claims (12)

The assembled battery comprising: control means for controlling an assembled battery including a plurality of secondary batteries; capacity adjusting means for adjusting the capacity of each of the plurality of secondary batteries; and a control board on which the capacity adjusting means is mounted. A capacity adjustment method for adjusting the capacity of
Determining the number of secondary batteries whose capacity can be adjusted together according to the relationship between the heat dissipation amount of the control board and the heat generation amount of the capacity adjusting means; and the number of secondary batteries determined in the step And adjusting the capacity of each secondary battery by controlling the capacity adjusting means. The method of claim 1, wherein the heat dissipation amount of the control board is determined according to a temperature of the control board, a temperature and a flow rate of a cooling medium flowing to the control board. 3. The set according to claim 1 or 2, wherein, in the step of adjusting the capacity of each secondary battery, the capacity is preferentially adjusted from a secondary battery having a large deviation between the voltage of each secondary battery and the target voltage. Battery capacity adjustment method. The method of adjusting a capacity of a battery pack according to any one of claims 1 to 3, further comprising a step of controlling a flow rate of a cooling medium flowing through the control board in accordance with a heat generation amount of the capacity adjusting means. When starting the assembled battery, it is determined whether or not a difference between the voltage of the assembled battery when the assembled battery is stopped and the voltage of the assembled battery when the assembled battery is started is greater than a predetermined value. The capacity adjustment method for an assembled battery according to any one of claims 1 to 4, wherein when the difference is larger than the predetermined value, the capacity is adjusted for all the secondary batteries. An auxiliary battery that supplies electric power to the control means, and when the voltage of the auxiliary battery is equal to or higher than a predetermined value, the capacity adjustment of each secondary battery is performed even after the assembled battery is stopped. The capacity adjustment method of the assembled battery according to any one of claims 1 to 5. A capacity adjusting device for adjusting the capacity of an assembled battery including a plurality of secondary batteries, the capacity adjusting means for adjusting the capacity of each of the plurality of secondary batteries;
A control board on which the capacity adjustment means is mounted; a means for detecting a heat radiation amount of the control board;
Means for detecting the amount of heat generated by the capacity adjusting means;
The number of secondary batteries whose capacity can be adjusted together is determined according to the relationship between the heat dissipation amount of the control board and the heat generation amount of the capacity adjusting means, and the capacity adjusting means is controlled to determine the determined value. And a control means for adjusting the capacity of the number of secondary batteries. The means for detecting the heat radiation amount of the control board includes means for detecting the temperature of the control board, means for detecting the temperature of the cooling medium flowing through the control board, and means for detecting the flow rate of the cooling medium flowing through the control board. Including
The capacity of the assembled battery according to claim 7, wherein the means for detecting the heat radiation amount of the control board is detected based on a temperature of the control board, a temperature of the cooling medium, and a flow rate of the cooling medium. Adjustment device. 9. The capacity adjustment apparatus for an assembled battery according to claim 7, wherein the control means preferentially adjusts the capacity from a secondary battery having a large deviation between the voltage of each secondary battery and the target voltage. 10. The control unit according to claim 7, wherein the control unit controls the flow rate of the cooling medium flowing through the control board in accordance with the heat generation amount detected by the unit that detects the heat generation amount of the capacity adjustment unit. The battery pack capacity adjustment device according to claim 1. Whether the difference between the voltage of the assembled battery when the assembled battery is stopped and the voltage of the assembled battery when the assembled battery is started is greater than a predetermined value when the assembled battery is activated. The capacity adjustment device for an assembled battery according to any one of claims 7 to 10, wherein the capacity of all the secondary batteries is adjusted when the difference is larger than the predetermined value. . An auxiliary battery that supplies power to the control means for controlling the assembled battery;
The said control means performs the capacity | capacitance adjustment of each said secondary battery, even after stopping the said assembled battery, when the voltage of the said auxiliary machine battery is more than predetermined value, The capacity adjustment apparatus of the assembled battery in any one.

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