JP2007110841A - Capacity adjusting device for battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacity adjusting device for a battery pack capable of preventing the generation of wasteful discharge resulting from a capacity variation including errors. <P>SOLUTION: A CPU21 determines capacity variations of all cells s1 to s4 and controls the charging and discharging of a battery pack 1 by setting a target value SOC of the battery pack 1 so as to become higher as the capacity variations are larger. However, if the magnitude of a discharge current detected by a current sensor 6 is above a first predetermined current, a voltage drop by the internal resistance of a cell becomes large and exact capacity variations cannot be detected, thus causing the difficult determination of capacity variations. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for adjusting capacity between a plurality of cells constituting an assembled battery.

  Capacitance adjustment between cells by increasing the SOC (charge rate) of the assembled battery according to the voltage variation between multiple cells that make up the assembled battery, and discharging the cells whose cell voltage exceeds the bypass operating voltage A technique for performing is known (see Patent Document 1).

JP-A-10-322925

  However, in the conventional technology, when the discharge current of the assembled battery is large, the voltage drop due to the internal resistance of the battery becomes large, so voltage variation between cells cannot be detected accurately, and capacity adjustment is not possible. There was a possibility that useless discharge was performed.

  The capacity adjustment device for an assembled battery according to the present invention increases the target SOC of the assembled battery as the capacity variation between the cells increases, and discharges the cells whose cell voltage exceeds a predetermined voltage. The capacity adjustment is performed, and when the magnitude of the discharge current of the assembled battery is equal to or larger than the first predetermined current, the capacity variation is not detected.

  According to the battery pack capacity adjustment device of the present invention, when the magnitude of the discharge current of the battery pack is greater than or equal to the first predetermined current, the capacity variation is not detected, and therefore, based on the capacity variation including an error. It is possible to prevent unnecessary discharge.

  FIG. 1 is a diagram showing a system configuration in which an assembled battery capacity adjustment device according to an embodiment is applied to an electric vehicle. In FIG. 1, the strong electric line is indicated by a thick solid line, the weak electric line is indicated by a thin solid line, and the control signal line is indicated by a dotted line. This electric vehicle travels using a motor generator 9 (hereinafter simply referred to as a motor 9) as a travel drive source.

  The assembled battery 1 is, for example, a nickel metal hydride battery, and is configured by connecting four cells s1 to s4 in series. The assembled battery 1 is connected to the inverter 10 and the auxiliary machine system 11 via the current sensor 6 and the main relays 8a and 8b, and supplies DC power to the inverter 10 and the auxiliary machine system 11. The inverter 10 converts the DC power supplied from the assembled battery 1 into AC power, and supplies the converted AC power to the AC motor 9. The inverter 10 also converts AC power generated by the motor 9 performing regenerative operation into DC power during braking of the vehicle. The converted DC power is used for charging the battery pack 1.

  The vehicle controller 3 controls the inverter 10 and the auxiliary machine system 11 to control the running of the vehicle and the operation of the auxiliary machine. The auxiliary machine system 11 includes an air conditioner, lights, and a wiper. Control power is supplied from the auxiliary battery 5 to the vehicle controller 3 and a battery controller 2 described later via the main switch 4. The main switch 4 corresponds to an ignition switch of an automobile that uses an engine as a travel drive source, and is turned on (closed) when a main key (not shown) of the electric vehicle is set to a travel position.

  The current sensor 6 detects a discharge current flowing from the assembled battery 1 to the inverter 10 and a charging current flowing from the inverter 10 to the assembled battery 1 and outputs the detected current to the CPU 21 of the battery controller 2 described later. The current sensor 6 detects the charging current as a positive value and detects the discharging current as a negative value. The main relays 8a and 8b are opened / closed by the CPU 21 to connect / release the high-power line, that is, the assembled battery 1 and the inverter 10. The voltage sensor 7 detects the total voltage of the assembled battery 1 and outputs it to the CPU 21.

  The temperature sensor 13 detects the temperature of the assembled battery 1 and outputs it to the CPU 21. The warning lamp 12 is turned on when an abnormality occurs in the electric vehicle, for example, when the assembled battery 1 is overcharged or overdischarged, and notifies the occupant of the occurrence of the abnormality.

  The CPU 21 includes a comparator (not shown), and compares the voltage of each of the cells s1 to s4 with the first predetermined voltage V1 to detect a cell whose cell voltage has dropped below the first predetermined voltage V1. Further, the CPU 21 compares the voltage of each of the cells s1 to s4 with the second predetermined voltage V2, and detects a cell whose cell voltage has risen to the second predetermined voltage V2 or higher. The first predetermined voltage V1 is a threshold voltage for detecting a cell whose cell voltage varies on the low voltage side, and the second predetermined voltage V2 (V2> V1) is a high cell voltage. This is a threshold voltage for detecting cells that vary on the voltage side.

  Moreover, CPU21 determines the target SOC of an assembled battery based on the voltage variation (capacity variation) between cells, and controls charging / discharging of the assembled battery 1 based on the determined target SOC. Furthermore, the SOC upper limit value of the assembled battery 1 is set based on the capacity variation on the high voltage side of the cell, and charging / discharging of the assembled battery 1 is controlled so that the SOC of the assembled battery 1 does not exceed the SOC upper limit value.

  The resistor R1 and the Zener diode D1 connected in series are connected in parallel with the cell s1. Similarly, the resistor R2 and the Zener diode D2 connected in series are connected in parallel to the cell s2, the resistor R3 and the Zener diode D3 are connected to the cell s3, and the resistor R4 and the Zener diode D4 are connected to the cell s4 in parallel. The resistors R1 to R4 and the Zener diodes D1 to D4 constitute a capacity adjustment circuit. For example, when the voltage of the cell s1 becomes higher than the Zener voltage Vz of the Zener diode D1, current starts to flow through the Zener diode D1. As a result, since a current flows from the cell s1 to the resistor R1, the voltage of the cell s1 decreases.

  FIG. 2 is a flowchart showing the contents of processing performed by the battery pack capacity adjustment device in one embodiment. When the main key of the vehicle (not shown) is turned on, the CPU 21 starts the process of step S10.

  In step S10, a capacity deterioration correction coefficient β and an internal resistance deterioration correction coefficient γ are obtained. The capacity deterioration correction coefficient β is a coefficient represented by a ratio between the discharge capacity when the assembled battery 1 is deteriorated and the discharge capacity when the assembled battery 1 is in the initial state (new), and the value increases as the deterioration of the assembled battery 1 progresses. Becomes smaller. The discharge capacity in the initial state is obtained in advance and stored in the memory 22. Further, the discharge capacity at the time of deterioration is obtained based on the current value detected by the current sensor 6 and the voltage value detected by the voltage sensor 7. Since the method for calculating the capacity deterioration correction coefficient β is known, detailed description thereof is omitted here.

  The internal resistance deterioration correction coefficient γ is a coefficient represented by the ratio between the internal resistance when the assembled battery 1 is in the initial state (new) and the internal resistance at the time of deterioration, and as the deterioration of the assembled battery 1 proceeds, The value becomes smaller. The internal resistance in the initial state is obtained in advance and stored in the memory 22. Further, the internal resistance at the time of deterioration is obtained based on the current value detected by the current sensor 6 and the voltage value detected by the voltage sensor 7. In addition, since the calculation method of internal resistance deterioration correction coefficient (gamma) is known, detailed description is abbreviate | omitted here.

  In step S20 following step S10, correction coefficients Kc and Kr for correcting current threshold values I1 and I2 described later are obtained. FIG. 3 is a diagram showing the relationship between the capacity deterioration rate (%) and the correction coefficient Kc. The capacity deterioration rate is a value indicating the degree of progress of capacity deterioration, and indicates a larger value as the capacity deterioration progresses. As shown in FIG. 3, the value of the correction coefficient Kc decreases as the capacity deterioration progresses. As described above, as the capacity deterioration progresses, the value of the capacity deterioration correction coefficient β decreases. Therefore, the value of the correction coefficient Kc decreases as the capacity deterioration correction coefficient β decreases. FIG. 3 shows the relationship between the capacity deterioration rate (%) and the correction coefficient Kc. A map showing the relationship between the capacity deterioration correction coefficient β and the correction coefficient Kc is prepared in advance and stored in the memory 22. The correction coefficient Kc can be obtained based on the capacity deterioration correction coefficient β obtained in step S10 and the map stored in the memory 22.

  FIG. 4 is a diagram showing the relationship between the internal resistance deterioration rate (%) and the correction coefficient Kr. The internal resistance deterioration rate is a value indicating the degree of progress of internal resistance deterioration, and shows a larger value as the internal resistance deterioration progresses. As shown in FIG. 4, the value of the correction coefficient Kr decreases as the internal resistance deterioration proceeds. As described above, the value of the internal resistance deterioration correction coefficient γ decreases as the internal resistance deterioration progresses. Therefore, the value of the correction coefficient Kc decreases as the internal resistance deterioration correction coefficient γ decreases. FIG. 4 shows the relationship between the internal resistance deterioration rate (%) and the correction coefficient Kr, but a map showing the relationship between the internal resistance deterioration correction coefficient γ and the correction coefficient Kr is prepared in advance and stored in the memory 22. In addition, the correction coefficient Kr can be obtained based on the internal resistance deterioration correction coefficient γ obtained in step S10 and the map stored in the memory 22.

  In step S30 following step S20, the temperature of the assembled battery 1 detected by the temperature sensor 13 is acquired, and the process proceeds to step S40. In step S40, based on the temperature of the assembled battery 1 acquired in step S30, a correction coefficient Kt for correcting current threshold values I1 and I2 described later is obtained. FIG. 5 is a diagram showing the relationship between the temperature of the assembled battery 1 and the correction coefficient Kt. As shown in FIG. 5, the value of the correction coefficient Kt when the temperature of the assembled battery 1 is 20 ° C. is 1. As the temperature is higher than 20 ° C., the value of the correction coefficient Kt is larger and the temperature is lower than 20 ° C. The value of the correction coefficient Kt is small. Here, a map of the relationship as shown in FIG. 5 is prepared in advance and stored in the memory 22, and the correction coefficient Kt is calculated based on the temperature obtained in step S30 and the map stored in the memory 22. Ask for.

In step S50 following step S40, the first current threshold value I1 and the second current threshold value I2 are calculated from the following equations (1) and (2).
I1 = Ia × Kc × Kr × Kt (1)
I2 = Ib × Kc × Kr × Kt (2)
However, Ia is a predetermined current value (negative value) for comparison with the current value detected when the battery pack is discharged, and Ib is for comparing with the current value detected when the battery pack is charged. It is a predetermined current value (positive value). Kc and Kr are the correction coefficients obtained in step S20, and Kt is the correction coefficient obtained in step 40. When the first current threshold value I1 and the second current threshold value I2 are calculated, the process proceeds to step S60.

  In step S60, the average SOC upper limit value is confirmed. The initial value of the average SOC upper limit value is 70%, and is set in step S150 described later. When the average SOC upper limit value is confirmed, the process proceeds to step S70. In step S70, based on the current value detected by the current sensor 6, it is determined whether the assembled battery 1 is being discharged or being charged. If it determines with the assembled battery 1 being discharging, it will progress to step S80, and if it determines with charging, it will progress to step S120.

  In step S80, it is determined whether or not there is a cell whose cell voltage is equal to or lower than the first predetermined voltage V1. As described above, the CPU 21 compares the voltage of each cell with the first predetermined voltage V1 as needed to monitor whether there is a cell whose cell voltage is equal to or lower than the first predetermined voltage V1. ing. If it is determined that there is no cell whose cell voltage is equal to or lower than the first predetermined voltage V1, the process returns to step S10. If it is determined that there is a cell whose cell voltage is equal to or lower than the first predetermined voltage V1, the process proceeds to step S90. .

  In step S90, it is determined whether or not the discharge current value detected by the current sensor 6 is equal to or less than the first current threshold value I1. As the first current threshold value I1, the value obtained in step S50 is used. If it is determined that the current value detected by the current sensor 6 is greater than the first current threshold value I1, the process proceeds to step S100 in order to calculate the capacity variation between the cells.

  On the other hand, if the current value detected by the current sensor 6 is equal to or smaller than the first predetermined current I1 in step S90, it is determined that the capacity variation between cells cannot be accurately calculated, and the process returns to step S10. . That is, when the discharge current of the assembled battery 1 is large, the voltage drop due to the internal resistance of the assembled battery 1 becomes large and the capacity variation between cells cannot be accurately calculated. Without returning to step S10.

  In step S100, the difference between the average SOC of the cell and the SOC of the cell having the lowest capacity (hereinafter referred to as MINSOC) is calculated. First, the average voltage Vave of the cells is obtained by dividing the total voltage Vt of the assembled battery detected by the voltage sensor 7 by the number of cells. Since the memory 22 stores a voltage-SOC map in which the relationship between the voltage of the cell and the SOC is associated, the average SOC of the cell is obtained based on the obtained average voltage Vave and the voltage-SOC map. In step S80, since it is confirmed that there is a cell whose cell voltage is equal to or lower than the first predetermined voltage V1, MINSOC is calculated based on the first predetermined voltage V1 and the voltage-SOC map. Calculate (estimate). Finally, the difference between the obtained average SOC and MINSOC is calculated.

  In step S110, based on the difference between the average SOC and MINSOC calculated in step S100, an SOC target value that means a target charging rate when charging the assembled battery 1 is calculated. FIG. 6 is a diagram showing the relationship between the difference between the average SOC and MINSOC and the SOC target value. As shown in FIG. 6, the SOC target value when the difference between the average SOC and MINSOC is 0 is set to 50%, and the SOC target value is increased as the difference between the average SOC and MINSOC increases. By increasing the SOC target value as the difference between the average SOC and MINSOC increases, the voltage value of each cell increases at the time of charging, so that the cell whose cell voltage exceeds the zener voltage Vz can be discharged. That is, by discharging a cell having a higher voltage than other cells, it is possible to reduce the capacity variation between the cells.

  Here, a relationship map as shown in FIG. 6 is prepared in advance and stored in the memory 22, and based on the SOC difference calculated in step S 100 and the map stored in the memory 22. The SOC target value is calculated.

  The CPU 21 checks whether or not the charging rate of the assembled battery 1 (or the average SOC of the cell) is equal to or lower than the SOC upper limit value at the time of charging, and when the charging rate of the assembled battery 1 reaches the SOC upper limit value, The charging of the battery 1 is controlled. That is, the charging of the assembled battery 1 is controlled so that the SOC of the assembled battery 1 does not exceed the SOC upper limit value.

  In step S <b> 120, which proceeds after it is determined that the assembled battery 1 is being charged in step S <b> 70, it is determined whether there is a cell whose cell voltage is equal to or higher than the second predetermined voltage V <b> 2. As described above, the CPU 21 compares the voltage of each cell with the second predetermined voltage V2 as needed to monitor whether there is a cell whose cell voltage is equal to or higher than the second predetermined voltage V2. ing. If it is determined that there is no cell whose cell voltage is equal to or higher than the second predetermined voltage V2, the process returns to step S10. If it is determined that there is a cell whose cell voltage is equal to or higher than the second predetermined voltage V2, the process proceeds to step S130. .

  In step S130, it is determined whether or not the current value (charging current value) detected by the current sensor 6 is equal to or greater than the second current threshold value I2. If it is determined that the current value detected by the current sensor 6 is less than the second current threshold value I2, the process proceeds to step S140 in order to calculate the capacity variation between the cells.

  On the other hand, if it is determined that the current value detected by the current sensor 6 is greater than or equal to the second current threshold value I2, it is determined that the capacity variation between the cells cannot be accurately calculated, and the process returns to step S10. That is, when the current value is large, the voltage drop due to the internal resistance of the assembled battery 1 becomes large, and the capacity variation between the cells cannot be calculated accurately. Return to S10.

  In step S140, the difference between the SOC of the cell having the highest capacity (hereinafter referred to as MAXSOC) and the average SOC of the cell is calculated. First, the average voltage Vave of the cells is obtained by dividing the total voltage Vt of the assembled battery detected by the voltage sensor 7 by the number of cells. Since the memory 22 stores a voltage-SOC map in which the relationship between the voltage of the cell and the SOC is associated, the average SOC of the cell is obtained based on the obtained average voltage Vave and the voltage-SOC map. In step S120, since it is confirmed that there is a cell whose cell voltage is equal to or higher than the second predetermined voltage V2, MAXSOC is calculated based on the second predetermined voltage V2 and the voltage-SOC map. Calculate (estimate). Finally, the difference between the MAXSOC and the average SOC is calculated. When the difference between the MAXSOC and the average SOC is calculated, the process proceeds to step S150.

  In step S150, an SOC upper limit value for limiting the SOC of the assembled battery 1 is obtained based on the difference between the MAX SOC calculated in step S140 and the average SOC. FIG. 7 is a diagram showing the relationship between the difference between MAX SOC and average SOC and the SOC upper limit value. As shown in FIG. 7, the SOC upper limit value when the difference between the MAXSOC and the average SOC is 0 is 70%, and the SOC upper limit value is decreased as the difference between the MAXSOC and the average SOC is larger. That is, in order to prevent a cell having a high voltage from being overcharged during charging, the SOC upper limit value is decreased as the difference between the MAX SOC and the average SOC increases. When the SOC upper limit value is obtained, the process returns to step S10.

  FIG. 8 shows the voltage V of the assembled battery 1 that varies when the assembled battery 1 is being charged, the charging / discharging current I of the assembled battery 1, the period during which the SOC upper limit value is not calculated, and the SOC target value It is a figure which shows each period which does not calculate. As described above, when the current value detected by the current sensor 6 is equal to or smaller than the first current threshold value I1, the calculation of the SOC target value is not performed because the capacity variation is not calculated (the SOC target value). Is prohibited). When the current value detected by the current sensor 6 is equal to or greater than the second current threshold value I1, the SOC upper limit value is not calculated.

  According to the assembled battery capacity adjusting apparatus in one embodiment, the larger the capacity variation between cells, the higher the target SOC of the assembled battery 1, and the discharge of the cells whose cell voltage exceeds a predetermined voltage. Thus, in the apparatus for adjusting the capacity between cells, when the magnitude of the discharge current of the assembled battery is equal to or larger than the first predetermined current, the capacity variation is not detected, and therefore, based on the capacity variation including an error. It is possible to prevent unnecessary discharge. As described above, when the magnitude of the discharge current of the battery pack 1 is greater than or equal to the first predetermined current, the voltage drop due to the internal resistance of the battery becomes large, so that the capacity variation between cells can be accurately detected. become unable. Therefore, when the magnitude of the discharge current of the assembled battery 1 is greater than or equal to the first predetermined current, the capacity variation is not detected, so that the accurate capacity variation amount is always detected, and the accurate capacity variation amount is determined. Appropriate capacity adjustment can be performed.

  In addition, according to the assembled battery capacity adjusting apparatus in one embodiment, the value of the first predetermined current is corrected based on the state of the assembled battery, in particular, the capacity deterioration degree, the internal resistance deterioration degree, and the battery temperature. Therefore, it is possible to appropriately set conditions for not detecting the capacity variation.

  Further, according to the assembled battery capacity adjustment device in one embodiment, the SOC upper limit value of the assembled battery is set based on the difference between the SOC of the cell having the highest voltage and the average SOC of all the cells. During charging, it is possible to prevent the cell having the highest voltage from being overcharged. However, when the magnitude of the charging current of the assembled battery 1 is equal to or greater than the second predetermined current, the difference between the SOC of the cell having the highest voltage and the average SOC of all cells is not calculated. That is, when the charging current is large, the voltage drop due to the internal resistance of the battery becomes large and the SOC difference cannot be obtained accurately. Therefore, the SOC upper limit value based on the erroneous SOC difference is set. Can be prevented.

  Further, according to the assembled battery capacity adjusting apparatus in one embodiment, the second predetermined current value is corrected based on the state of the assembled battery, in particular, the capacity deterioration degree, the internal resistance deterioration degree, and the battery temperature. Therefore, it is possible to appropriately set a condition for not detecting the capacitance variation on the high voltage side.

  The present invention is not limited to the embodiment described above. For example, the first current threshold value I1 and the second current threshold value I2 are obtained by correcting predetermined current values based on three parameters of battery capacity deterioration, internal resistance deterioration degree, and battery temperature. The correction can be performed based on any one or two parameters, or can be performed using a parameter other than the above three parameters.

  In the above-described embodiment, if the current sensor 6 detects the discharge current value as a negative value and the discharge current value detected by the current sensor 6 is equal to or less than the first current threshold value I1, the capacity variation will be reduced. Detection was not performed. In a system in which the current sensor 6 detects the discharge current value as a positive value, the first current threshold is set as a positive value, and the discharge current value detected by the current sensor 6 is the first current. If the threshold value is equal to or greater than I1, it is sufficient not to detect the capacity variation. That is, if the magnitude of the discharge current value is greater than or equal to the first current threshold value I1, the capacity variation is not detected.

  In the embodiment described above, the variation in capacity is not detected if the magnitude of the discharge current value is equal to or greater than the first current threshold value I1. However, when the magnitude of the discharge current value is equal to or greater than the first current threshold value I1, the capacity variation is detected, but the target SOC is not set based on the detected capacity variation amount. A system that does not perform capacity adjustment based on the amount of variation is also included in the technical scope of the present invention.

  In the above-described embodiment, the charge / discharge current of the assembled battery 1 is detected by the current sensor 6, but the current sensor 6 may not be provided. In this case, the charge / discharge current value can be estimated based on the power generation command value or the discharge command value of the motor 9, and the estimated current value can be used as the current detection value.

  In the above-described embodiment, a system in which the assembled battery capacity adjustment device is applied to an electric vehicle has been described as an example. However, the system can be applied to a hybrid vehicle or a system other than a vehicle. .

  Although the assembled battery 1 has been described as being composed of four cells, the present invention is not limited by the number of cells constituting the assembled battery.

  The correspondence between the constituent elements of the claims and the constituent elements of the embodiment is as follows. That is, the battery controller 2 includes a capacity variation amount detection means, a target SOC setting means, a charge / discharge control means, a first predetermined current correction means, a capacity deterioration degree detection means, an internal resistance deterioration degree detection means, an SOC upper limit value calculation means, and The resistors R1 to R4 and the Zener diodes D1 to D4 constitute discharge means, the current sensor 6 constitutes current detection means, and the temperature sensor 13 constitutes temperature detection means. In addition, the above description is an example to the last, and when interpreting invention, it is not limited to the correspondence of the component of said embodiment and the component of this invention at all.

The figure which shows the system configuration which applied the capacity adjustment apparatus of the assembled battery in one embodiment to the electric vehicle The flowchart which shows the processing content performed by the capacity adjustment apparatus of the assembled battery in one embodiment The figure which shows the relationship between capacity degradation rate (%) and the correction coefficient Kc The figure which shows the relationship between internal resistance deterioration rate (%) and the correction coefficient Kr The figure which shows the relationship between the temperature of an assembled battery, and the correction coefficient Kt The figure which shows the relationship between the difference of average SOC and MINSOC, and SOC target value The figure which shows the relationship between the difference of MAXSOC and average SOC, and SOC upper limit The voltage V of the battery pack, the battery charge / discharge current I, the period during which the SOC upper limit value is not calculated, and the period during which the SOC target value is not calculated are as follows. Illustration

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Battery assembly, 2 ... Battery controller, 3 ... Vehicle controller, 4 ... Main switch, 5 ... Auxiliary battery, 6 ... Current sensor, 7 ... Voltage sensor, 8a, 8b ... Main relay, 9 ... Motor, 10 ... Inverter, DESCRIPTION OF SYMBOLS 11 ... Auxiliary machine system, 12 ... Warning light, 13 ... Temperature sensor, 21 ... CPU, 22 ... Memory

Claims (15)

In a battery pack capacity adjustment device configured by connecting a plurality of cells in series,
Discharging means for discharging the cell when the voltage of the cell exceeds a predetermined voltage;
Capacity variation amount detecting means for detecting the size of the cell capacity variation;
Target SOC setting means for increasing the target SOC of the assembled battery as the capacity variation amount detected by the capacity variation amount detection means increases;
Charge / discharge control means for controlling charge / discharge of the assembled battery based on the target SOC set by the target SOC setting means;
Current detection means for detecting the charge / discharge current of the assembled battery,
The capacity variation amount detection means does not detect the capacity variation amount when the magnitude of the discharge current detected by the current detection means is equal to or greater than a first predetermined current. Capacity adjustment device. The capacity adjustment apparatus for an assembled battery according to claim 1,
The capacity variation amount detecting unit obtains a difference between an average SOC of all cells and an SOC of a cell having the lowest voltage as the capacity variation amount. The capacity adjustment apparatus of the assembled battery according to claim 1 or 2,
An assembled battery capacity adjusting device, further comprising: a first predetermined current correcting unit that corrects the first predetermined current based on a state of the assembled battery. The capacity adjustment apparatus of the assembled battery according to claim 3,
Further comprising a capacity deterioration degree detecting means for detecting the capacity deterioration degree of the assembled battery,
The capacity adjustment device for an assembled battery, wherein the first predetermined current correction means decreases the first predetermined current as the capacity deterioration degree detected by the capacity deterioration degree detection means increases. In the capacity adjustment apparatus of the assembled battery according to claim 3 or 4,
An internal resistance deterioration degree detecting means for detecting the internal resistance deterioration degree of the assembled battery;
The capacity adjustment device for a battery pack according to claim 1, wherein the first predetermined current correction means decreases the first predetermined current as the internal resistance deterioration degree detected by the internal resistance deterioration degree detection means increases. In the capacity adjustment apparatus of the assembled battery in any one of Claims 3-5,
It further comprises temperature detection means for detecting the temperature of the assembled battery,
The assembled battery capacity adjusting apparatus, wherein the first predetermined current correcting means reduces the first predetermined current as the temperature of the assembled battery detected by the temperature detecting means is lower. The capacity adjustment device for an assembled battery according to claim 6,
The capacity adjustment device for an assembled battery, wherein the first predetermined current correcting means increases the first predetermined current as the temperature of the assembled battery detected by the temperature detecting means is higher. In the capacity adjustment apparatus of the assembled battery in any one of Claims 1-3,
SOC difference calculating means for obtaining a difference between the SOC of the cell having the highest voltage and the average SOC of all the cells;
SOC upper limit value calculating means for calculating the SOC upper limit value of the assembled battery based on the SOC difference calculated by the SOC difference calculating means,
The charge / discharge control means controls the charge / discharge of the assembled battery so that the SOC of the assembled battery does not exceed the SOC upper limit calculated by the SOC upper limit calculating means. apparatus. The capacity adjustment apparatus of the assembled battery according to claim 8,
The SOC upper limit calculating means does not calculate the SOC upper limit value when the magnitude of the charging current detected by the current detecting means is equal to or greater than a second predetermined current. Capacity adjustment device. The capacity adjustment device for an assembled battery according to claim 9,
An assembled battery capacity adjusting device, further comprising: a second predetermined current correcting unit that corrects the second predetermined current based on a state of the assembled battery. The capacity adjustment apparatus of the assembled battery according to claim 10,
Further comprising a capacity deterioration degree detecting means for detecting the capacity deterioration degree of the assembled battery,
The assembled battery capacity adjusting device, wherein the second predetermined current correcting means decreases the second predetermined current as the capacity deterioration degree detected by the capacity deterioration degree detecting means is larger. The capacity adjustment apparatus of the assembled battery according to claim 10 or 11,
An internal resistance deterioration degree detecting means for detecting the internal resistance deterioration degree of the assembled battery;
The battery pack capacity adjustment apparatus according to claim 2, wherein the second predetermined current correction unit decreases the second predetermined current as the internal resistance deterioration degree detected by the internal resistance deterioration degree detection unit increases. The capacity adjustment apparatus for an assembled battery according to any one of claims 10 to 12,
It further comprises temperature detection means for detecting the temperature of the assembled battery,
The assembled battery capacity adjusting apparatus, wherein the second predetermined current correcting means reduces the second predetermined current as the temperature of the assembled battery detected by the temperature detecting means is lower. The capacity adjustment device for an assembled battery according to claim 13,
The capacity adjustment device for an assembled battery, wherein the second predetermined current correcting means increases the second predetermined current as the temperature of the assembled battery detected by the temperature detecting means is higher. The capacity adjustment apparatus of the assembled battery according to any one of claims 1 to 14,
The battery pack capacity adjustment apparatus, wherein the current detector uses a current command value when charging / discharging of the battery pack is controlled by the charge / discharge controller as a current detection value.

Images