JP2018057137A - Full charge capacity calculation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a full charge capacity calculation device capable of calculating full charge capacity of a battery pack which is constituted of a plurality of battery cells connected in series without calculating full charge capacity of the respective battery cells when the full charge capacity of the battery pack is calculated.SOLUTION: A full charge capacity calculation device 14 is provided with: a SOC calculation part 140; an integrated current amount calculation part 141; and a full charge capacity calculation part 144. The a full charge capacity calculation part 144 calculates the minimum full charge capacity based on SOC before charge/discharge of a battery pack B1 calculated by the SOC calculation part 140 based on OCV before the charge/discharge of the battery pack B1, SOC after equalization of the battery pack B1 calculated by the SOC calculation part 140 based on the SOC after equalization of the battery pack B1, and an integrated current amount calculated by the integrated current amount calculation part 141.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a full charge capacity calculation device for calculating a full charge capacity of a battery pack composed of a plurality of battery cells connected in series.

  2. Description of the Related Art Conventionally, as a full charge capacity calculation device that calculates the full charge capacity of an assembled battery composed of a plurality of battery cells connected in series, for example, there is an assembled battery control device disclosed in Patent Document 1 shown below.

  This control device for a battery pack is a device that calculates an internal characteristic state of a battery pack composed of a plurality of single cells connected in series, and controls the battery pack based on the calculated internal characteristic state. Here, the single battery corresponds to a battery cell.

  The battery pack control device calculates the full charge capacity of each single battery constituting the battery pack, and selects the single battery having the minimum full charge capacity. Then, the internal state characteristics of the selected cell are calculated and set as the internal state characteristics of the assembled battery.

JP 2010-273413 A

  In the battery pack control device described above, when the full charge capacity is calculated as the internal state characteristic of the battery pack, the full charge capacity of each single cell constituting the battery pack must be calculated. The processing required for calculating the full charge capacity of one single cell must be performed by the number of single cells constituting the assembled battery. For this reason, the time required to calculate the full charge capacity of the assembled battery becomes long. On the other hand, although the time can be shortened by speeding up the calculation process, the cost of the apparatus increases.

  The present invention has been made in view of such circumstances, and when calculating the full charge capacity of a battery pack composed of a plurality of battery cells connected in series, the full charge capacity of each battery cell is calculated. It is an object of the present invention to provide a full charge capacity calculation device capable of calculating the full charge capacity of a battery pack without performing the above process.

  The present invention made in order to solve the above problems is a full charge capacity calculation device for calculating the full charge capacity of a battery pack composed of a plurality of battery cells connected in series, wherein the OCV (Open Circuit) of the battery pack is used. An SOC calculation unit that calculates an SOC (State Of Charge) of the assembled battery based on the voltage, and an integrated current amount calculation that calculates an integrated current amount that is an integrated value of the current flowing through the assembled battery during the charge / discharge period of the assembled battery The SOC before charging / discharging of the assembled battery calculated by the SOC calculating unit based on the OCV before charging / discharging of the assembled battery before the start of the charging / discharging period, and after the relaxation time has elapsed after the charging / discharging period ends, Based on the OCV after equalization of the assembled battery after performing equalization to discharge other battery cells so that the voltage difference between the battery cell having the lowest voltage and the other battery cells is all equal to or lower than a predetermined voltage. Has a equalization after SOC of the battery OC calculating unit has calculated, and the minimum full charge capacity calculation unit for calculating a minimum full charge capacity based on the integrated current amount of accumulated current amount calculating unit has calculated, the. Here, OCV is an open circuit voltage. The SOC is the remaining capacity and is expressed as a ratio to the full charge capacity.

  According to this configuration, the plurality of battery cells constituting the assembled battery are equalized so that the voltage difference between the battery having the lowest voltage and the other battery cells is all equal to or lower than the predetermined voltage. OCV and SOC have a predetermined relationship. Therefore, the SOC before charge / discharge of each battery cell constituting the assembled battery is substantially the same as the SOC before charge / discharge of the battery cell having the smallest full charge capacity. After the relaxation time has elapsed since the end of the charge / discharge period, the plurality of battery cells constituting the assembled battery are equally distributed so that the voltage difference between the battery cell with the lowest voltage and the other battery cells is all equal to or lower than the predetermined voltage. It becomes. Therefore, the SOC after equalization of the assembled battery is almost the same as the SOC after equalization of the battery cell having the smallest full charge capacity. The full charge capacity can be calculated based on the SOC in one state, the SOC in another state, and the accumulated current amount therebetween. Therefore, the minimum full charge capacity of the assembled battery can be calculated from the pre-charge / discharge SOC of the assembled battery, the post-equalized SOC of the assembled battery, and the integrated current amount during the charge / discharge period. That is, the full charge capacity of the battery pack can be calculated without calculating the full charge capacity of each battery cell.

It is a block diagram of the full charge capacity calculation apparatus in this embodiment. It is a 1st flowchart for demonstrating operation | movement of the full charge capacity calculation apparatus in this embodiment. It is a 2nd flowchart for demonstrating operation | movement of the full charge capacity calculation apparatus in this embodiment. It is a graph of the voltage waveform of each battery cell for demonstrating operation | movement of the full charge capacity calculation apparatus in this embodiment.

  Next, the present invention will be described in more detail with reference to embodiments. In the present embodiment, an example in which the full charge capacity calculation device according to the present invention is applied to an assembled battery control system for controlling an assembled battery mounted on a vehicle is shown.

  First, the configuration of the assembled battery control system will be described with reference to FIG.

  An assembled battery control system 1 shown in FIG. 1 is a system that controls an assembled battery B1 mounted on a vehicle. Here, the assembled battery B1 is configured by connecting five battery cells C10 to C14 in series. The positive electrode end and the negative electrode end of the assembled battery B1 are connected to an in-vehicle device mounted on the vehicle via system main relays R10 and R11. The assembled battery control system 1 includes a voltage sensor 10, a current sensor 11, an equalization circuit 12, voltage sensors 130 to 134, and a full charge capacity calculation device 14.

  The voltage sensor 10 is a sensor that detects the voltage of the assembled battery B1. The detection result of the voltage sensor 10 when the system main relays R10 and R11 are in the off state is the OCV of the assembled battery B1. Here, the OCV of the assembled battery B1 is an open circuit voltage of the assembled battery B1. One end of the voltage sensor 10 is connected to the positive end of the assembled battery B1, and the other end is connected to the negative end of the assembled battery B1. The output terminal is connected to the full charge capacity calculation device 14.

  The current sensor 11 is a sensor that detects a current flowing through the assembled battery B1. The current sensor 11 is connected between the positive end of the assembled battery B1 and the system main relay R10. The output terminal of the current sensor 11 is connected to the full charge capacity calculation device 14.

  In order to control the assembled battery B1, the equalization circuit 12 discharges the other battery cells so that the voltage difference between the battery cell having the lowest voltage and the other battery cells is equal to or lower than a predetermined voltage, and the battery cells C10 to C10 are discharged. This circuit equalizes the voltage of C14. The equalization circuit 12 includes switches 120 to 124 and resistors 125 to 129.

  The switches 120 to 124 are elements for discharging the battery cells C10 to C14 via the resistors 125 to 129. The resistors 125 to 129 are elements for regulating the current that flows when the battery cells C10 to C14 are discharged. The switches 120 to 124 and the resistors 125 to 129 are connected in series. One ends of the switches 120 to 124 are connected to the positive ends of the battery cells C10 to C14, and one ends of the resistors 125 to 129 are connected to the negative ends of the battery cells C10 to C14, respectively.

  The voltage sensors 130 to 134 are sensors that detect the voltages of the battery cells C10 to C14. One ends of the voltage sensors 130 to 134 are connected to the positive ends of the battery cells C10 to C14, and the other ends are connected to the negative ends of the battery cells C10 to C14. Output terminals of the voltage sensors 130 to 134 are connected to the full charge capacity calculation device 14, respectively.

  Another device (not shown) in the assembled battery control system 1 turns on the switches 120 to 124 based on the detection results of the voltage sensors 130 to 134 and discharges them through the resistors 125 to 129, whereby the battery cell The voltages C10 to C14 can be equalized.

  The full charge capacity calculation device 14 is a device that calculates the full charge capacity of the assembled battery B1 used for controlling the assembled battery B1. Specifically, it is a device that calculates the minimum full charge capacity and the average full charge capacity of the battery pack B1. The full charge capacity calculation device 14 includes an SOC calculation unit 140, an integrated current amount calculation unit 141, a charge / discharge time calculation unit 142, a full charge capacity calculation determination unit 143, a full charge capacity calculation unit 144, and a full charge capacity. A correction unit 145 and a full charge capacity storage unit 146 are provided.

  The SOC calculation unit 140 is a block that calculates the SOC of the assembled battery B1 based on the OCV of the assembled battery B1 detected by the voltage sensor 10. Specifically, this is a block for calculating the SOC of the assembled battery B1 from the OCV of the assembled battery B1 based on a preset relationship between the OCV and SOC of the assembled battery B1. The SOC calculation unit 140 is also a block that calculates a difference SOC that is a difference between the SOC of the assembled battery B1 in a certain state and the SOC of the assembled battery B1 in a different state. Here, the SOC of the assembled battery B1 is the remaining capacity of the assembled battery B1, and is expressed as a ratio to the full charge capacity.

  The SOC calculation unit 140 calculates the battery pack B1 from the OCV before charge / discharge of the battery pack B1 before the start of the charge / discharge period detected by the voltage sensor 10 based on the preset relationship between the OCV and SOC of the battery pack B1. The pre-charge / discharge SOC is calculated. Specifically, the SOC before charging / discharging of the assembled battery B1 is calculated based on the OCV before charging / discharging of the assembled battery B1 after the time equal to or longer than the relaxation time α has elapsed since the end of the previous charging / discharging period. Also, after charging / discharging of the assembled battery B1 after the relaxation time α has elapsed since the end of the charging / discharging period detected by the voltage sensor 10 based on the preset relationship between the OCV and the SOC of the assembled battery B1. The SOC after charging / discharging of the battery pack B1 is calculated from the OCV. Furthermore, based on the preset relationship between the OCV and the SOC of the assembled battery B1, the battery cell having the lowest voltage after the relaxation time α has elapsed since the end of the charging / discharging period detected by the voltage sensor 10 Calculate the post-equalization SOC of the battery pack B1 from the post-equalization OCV of the battery pack B1 after performing the equalization to discharge other battery cells so that the voltage differences of the other battery cells are all equal to or less than the predetermined voltage β. To do. The SOC calculation unit 140 calculates a post-charge / discharge difference SOC that is a difference between the pre-charge / discharge SOC of the battery pack B1 and the post-charge / discharge SOC. Further, a post-equalization difference SOC, which is a difference between the pre-charge / discharge SOC of the battery pack B1 and the post-equalization SOC, is calculated. Here, the charging / discharging period means that a start switch of a vehicle (not shown) is turned on and the system main relays R10 and R11 are turned on accordingly, and then the start switch is turned off and the system main relays R10 and R11 are turned on. This is the period until is turned off. That is, this is a period in which the vehicle is in a starting state and power is exchanged between the assembled battery B1 and the in-vehicle device via the system main relays R10 and R11. This is a period from when the system main relays R10 and R11 are turned on to when they are turned off. When the system main relays R10 and R11 are once turned off from the on state and turned on again, the system main relays R10 and R11 are turned on for the first time and the second time unless the start switch is turned off. The ON state is one charge / discharge period. In addition, the relaxation time α is set to a time sufficient to alleviate the influence of the polarization of the battery cells C10 to C14 that occurs with charge / discharge. The predetermined voltage β is set to a voltage such that an error in the full charge capacity calculated based on the equalized OCV of the assembled battery B1 is within an allowable range.

  The integrated current amount calculation unit 141 is a block that integrates the current flowing through the assembled battery B1 detected by the current sensor 11 and calculates the integrated current amount of the assembled battery B1 during the charge / discharge period.

  The charge / discharge time calculation unit 142 is a block that calculates the time of the charge / discharge period.

  The full charge capacity calculation determination unit 143 is a block that determines whether or not to calculate the average full charge capacity and the minimum full charge capacity of the assembled battery B1. Specifically, whether the post-charge / discharge difference SOC and the post-equalization difference SOC calculated by the SOC calculation unit 140 are greater than a predetermined value γ, or the charge / discharge time calculated by the charge / discharge time calculation unit 142. This block determines whether or not the time is less than the predetermined time δ and whether or not the voltage sensor 10 and the current sensor 11 are both normal. The full charge capacity calculation determination unit 143 determines whether the voltage sensor 10 and the current when the post-charge / discharge difference SOC and the post-equalization difference SOC of the battery pack B1 are equal to or less than a predetermined value γ, When at least one of the sensors 11 is abnormal, if it is at least one, the full charge capacity calculation unit 144 calculates the average full charge capacity, the minimum full charge capacity, and the full charge capacity correction unit 145 corrects it. The calculation of the average full charge capacity and minimum full charge capacity is stopped. Here, the predetermined value γ is set to such a value that the error of the full charge capacity calculated based on the differential SOC falls within an allowable range. The predetermined time δ is set to such a time that the error of the full charge capacity calculated based on the detection result of the current sensor 11 having the offset error falls within an allowable range.

  The full charge capacity calculation unit 144 is a block that calculates the average full charge capacity and the minimum full charge capacity of the assembled battery B1. It is a block equivalent to the average full charge capacity calculation part and minimum full charge capacity calculation part of this invention. The full charge capacity calculation unit 144 calculates the pre-charge / discharge SOC of the assembled battery B1 calculated by the SOC calculation unit 140, the post-charge / discharge SOC of the assembled battery B1 calculated by the SOC calculation unit 140, and the integrated current amount calculation unit 141. The average full charge capacity of the battery pack B1 is calculated based on the integrated current amount. Specifically, this is a block for calculating the average full charge capacity of the battery pack B1 based on the post-charge / discharge difference SOC calculated by the SOC calculation unit 140 and the integrated current amount calculated by the integrated current amount calculation unit 141. More specifically, the average full charge capacity is calculated based on the following formula (1).

  Average full charge capacity = (integrated current amount / differential SOC after charge / discharge) × 100 (1)

  In addition, the full charge capacity calculation unit 144 is a pre-charge / discharge SOC of the battery pack B1 calculated by the SOC calculation unit 140, a post-equalization SOC of the battery pack B1 calculated by the SOC calculation unit 140, and an integrated current amount calculation unit 141. The minimum full charge capacity of the battery pack B1 is calculated based on the calculated integrated current amount. Specifically, the minimum full charge capacity of the battery pack B1 is calculated based on the post-equalization difference SOC calculated by the SOC calculation unit 140 and the integrated current amount calculated by the integrated current amount calculation unit 141. More specifically, the minimum full charge capacity is calculated based on the following formula (2).

  Minimum full charge capacity = (integrated current amount / differential SOC after equalization) × 100 (2)

  The full charge capacity correction unit 145 is a block that corrects the calculated average full charge capacity and minimum full charge capacity of the assembled battery B1. 4 is a block corresponding to an average full charge capacity correction unit and a minimum full charge capacity correction unit of the present invention. The full charge capacity correction unit 145 performs a predetermined calculation from the corrected average full charge capacity calculated last time stored in a full charge capacity storage unit 146 described later and the average full charge capacity calculated this time by the full charge capacity calculation unit 144. Based on the equation, the corrected average full charge capacity is calculated. Specifically, average full charge corrected based on Equation (3) shown below using annealing constant k1 (0.1 ≦ k1 ≦ 0.99) set beforehand and annealing constant k1. Calculate capacity.

  Corrected average full charge capacity = corrected average full charge capacity calculated last time stored in full charge capacity storage unit 146 × (1-k1) + average full charge capacity calculated this time by full charge capacity calculation unit 144 × k1 (3)

  Further, the full charge capacity correction unit 145 performs a predetermined calculation from the corrected minimum full charge capacity calculated in the previous time stored in the full charge capacity storage unit 146 and the minimum full charge capacity calculated by the full charge capacity calculation unit 144 this time. Based on the equation, the corrected minimum full charge capacity is calculated. Specifically, the minimum full charge corrected based on the preset annealing constant k2 (0.1 ≦ k2 ≦ 0.99) and the following equation (4) using the annealing constant k2. Calculate capacity.

  Corrected minimum full charge capacity = corrected minimum full charge capacity calculated last time stored in full charge capacity storage unit 146 × (1-k2) + minimum full charge capacity calculated this time by full charge capacity calculation unit 144 × k2 (4)

  The full charge capacity storage unit 146 is a block that stores the average full charge capacity and the minimum full charge capacity of the battery pack B1. Specifically, the average full charge capacity and the minimum full charge capacity corrected by the full charge capacity correction unit 145 are updated and stored as new average full charge capacity and minimum full charge capacity.

  Next, with reference to FIGS. 1-4, operation | movement of the full charge capacity calculation part apparatus which comprises the assembled battery control system of this embodiment is demonstrated.

  As shown in FIG. 2, the SOC calculation unit 140 shown in FIG. 1 determines that the start switch is turned on based on information input from another device (not shown) in the assembled battery control system 1 in step S100. It is determined whether or not there is. If it is determined in step S100 that the start switch is not in the on state, SOC calculation unit 140 repeats the same determination until the start switch is in the on state. On the other hand, when it is determined in step S100 that the start switch is in the on state, the SOC calculation unit 140 is based on information input from another device (not shown) in the assembled battery control system 1 in step S101. Then, it is determined whether or not a time longer than the relaxation time α has elapsed since the start switch was turned off last time. As will be described later, when the start switch is turned off, the system main relays R10 and R11 are also turned off, and the charging / discharging period ends. That is, SOC calculation unit 140 determines whether a time equal to or longer than relaxation time α has elapsed since the end of the previous charge / discharge period.

  In step S101, if it is determined that the time equal to or greater than the relaxation time α has not elapsed since the end of the previous charge / discharge period, it is determined that the polarization effect of the battery cells C10 to C14 is not sufficiently relaxed, The process for calculating the full charge capacity is terminated. That is, calculation of the average full charge capacity and the minimum full charge capacity of the assembled battery B1 by the full charge capacity calculation unit 144, which will be described later, is stopped. Further, the calculation of the corrected average full charge capacity and the corrected minimum full charge capacity by the full charge capacity correction unit 145 is stopped.

  On the other hand, if it is determined in step S101 that the time equal to or longer than the relaxation time α has elapsed since the end of the previous charge / discharge period, it is determined that the influence of the polarization of the battery cells C10 to C14 is sufficiently relaxed. And SOC calculation part 140 acquires OCV before charge-and-discharge of assembled battery B1 which voltage sensor 10 detected in Step S102. In step S103, the SOC before charging / discharging of the assembled battery B1 is calculated from the obtained OCV before charging / discharging of the assembled battery B1 based on the preset relationship between the OCV and SOC of the assembled battery B1.

  Thereafter, the integrated current amount calculation unit 141 and the charge / discharge time calculation unit 142 are based on information input from other devices (not shown) in the assembled battery control system 1 in step S104, and the system main relays R10 and R11. It is determined whether or not is in an on state. The system main relays R10 and R11 are turned on after the start switch is turned on. If it is determined in step S104 that the system main relays R10 and R11 are not in the on state, it is determined that the charge / discharge period has not started, and the integrated current amount calculation unit 141 and the charge / discharge time calculation unit 142 The same determination is repeated until R11 is turned on. On the other hand, if it is determined in step S104 that the system main relays R10 and R11 are in the on state, it is determined that the charging / discharging period has started, and the integrated current amount calculation unit 141 determines that the current sensor 11 is in step S105. The detected current flowing in the assembled battery B1 is integrated. In step S105, the charge / discharge time calculation unit 142 measures the time for calculating the time of the charge / discharge period. Thereafter, in step S106, the integrated current amount calculation unit 141 and the charge / discharge time calculation unit 142 determine that the start switch is off based on information input from another device (not shown) in the assembled battery control system 1. It is determined whether or not there is. The system main relays R10 and R11 are immediately turned off when the start switch is turned off. If it is determined in step S106 that the start switch is not in the OFF state, it is determined that the charge / discharge period has not ended, and the integrated current amount calculation unit 141 and the charge / discharge time calculation unit 142 until the start switch is in the OFF state. The process of step 105 is repeated.

  When the start switch is turned off, the system main relays R10 and R11 are also turned off. If it is determined in step S106 that the start switch is in the OFF state, it is determined that the charging / discharging period has ended, and in step S107, the integrated current amount calculation unit 141 determines the integrated current amount of the assembled battery B1 during the charging / discharging period. Complete the calculation. In step S107, the charge / discharge time calculation unit 142 completes the calculation of the charge / discharge period time.

  In step S108, the SOC calculation unit 140 determines whether the relaxation time α has elapsed since the start switch was turned off based on information input from another block of the assembled battery control system 1. If it is determined in step S108 that the relaxation time α has not elapsed since the start switch was turned off, it is determined that the influence of the polarization of the battery cells C10 to C14 has not been sufficiently relaxed, and the SOC calculation unit 140 The same determination is repeated until the relaxation time α elapses. On the other hand, if it is determined in step S108 that the relaxation time α has elapsed since the start switch was turned off, it is determined that the influence of the polarization of the battery cells C10 to C14 is sufficiently relaxed, and the SOC calculation unit 140 In step S109, the OCV after charging / discharging of the assembled battery B1 detected by the voltage sensor 10 is acquired. In step S110, the SOC after charging / discharging of the assembled battery B1 is calculated from the obtained OCV after charging / discharging of the assembled battery B1 based on the preset relationship between the OCV and SOC of the assembled battery B1. Further, in step S111, a post-charge / discharge difference SOC of the assembled battery B1 is calculated.

  Thereafter, as shown in FIG. 3, the full charge capacity calculation determination unit 143 shown in FIG. 1 determines whether or not to calculate the average full charge capacity in step S112. Specifically, whether the post-charge / discharge difference SOC of the battery pack B1 is greater than a predetermined value γ, whether the charge / discharge time is less than a predetermined time δ, and whether the voltage sensor 10 and the current sensor 11 are both normal. Determine whether or not.

  In step S112, when it is determined that the difference SOC after charging / discharging of the assembled battery B1 is larger than the predetermined value γ, the charging / discharging time is shorter than the predetermined time δ, and both the voltage sensor 10 and the current sensor 11 are normal, the full charge capacity The calculation determination unit 143 permits the calculation of the average full charge capacity.

  In step S113, the full charge capacity calculation unit 144 calculates the pre-charge / discharge SOC calculated by the SOC calculation unit 140, the post-charge / discharge SOC calculated by the SOC calculation unit 140, and the integrated current amount calculated by the integrated current amount calculation unit 141. Based on the above, the average full charge capacity of the battery pack B1 is calculated. Specifically, the average full charge capacity of the battery pack B1 is calculated based on the post-charge / discharge difference SOC calculated by the SOC calculation unit 140 and the integrated current amount calculated by the integrated current amount calculation unit 141. More specifically, the average full charge capacity of the assembled battery B1 is calculated based on the formula (1).

  Thereafter, the full charge capacity correction unit 145 corrects the calculated average full charge capacity of the assembled battery B1 in step S114. Specifically, based on a predetermined calculation formula from the corrected average full charge capacity calculated last time stored in the full charge capacity storage unit 146 and the average full charge capacity calculated by the full charge capacity calculation unit 144 this time, The corrected average full charge capacity is calculated. More specifically, a new average full charge capacity corrected based on Equation (3) is calculated. In step S115, the full charge capacity correction unit 145 updates the corrected average full charge capacity as a new average full charge capacity, and stores it in the full charge capacity storage unit 146.

  On the other hand, when it is determined in step S112 that the post-charge / discharge difference SOC of the assembled battery B1 is equal to or less than the predetermined value γ, the influence of the error included in the post-charge / discharge difference SOC increases, and the accuracy of the average full charge capacity decreases. Therefore, step S113 to step S115 are not performed. In addition, when it is determined that the charge / discharge time is equal to or longer than the predetermined time δ, the influence of the offset error of the current sensor 11 is increased and the accuracy of the accumulated current amount is lowered, and accordingly, the accuracy of the average full charge capacity is also lowered. Steps S113 to S115 are not performed. Furthermore, when it is determined that at least one of the voltage sensor 10 and the current sensor 11 is abnormal, the reliability of the OCV and the accumulated current amount is low, and thus Steps S113 to S115 are not performed. That is, when the difference SOC after charging / discharging of the assembled battery B1 is equal to or less than the predetermined value γ, when the charge / discharge time is equal to or longer than the predetermined time δ, or when at least one of the voltage sensor 10 and the current sensor 11 is abnormal, In the case of at least one, the calculation of the average full charge capacity by the full charge capacity calculation unit 144 and the calculation of the average full charge capacity corrected by the full charge capacity correction unit 145 are stopped.

  Thereafter, another device (not shown) in the battery pack control system 1 controls the equalization circuit 12 based on the voltages of the battery cells C10 to C14 detected by the voltage sensors 130 to 134, and the battery cells C10 to C14. Equalize the voltage. Specifically, the switches 120 to 124 are controlled so that the voltage difference between the battery cell having the lowest voltage and the other battery cells is all equal to or less than the predetermined voltage β.

  In step S116, the SOC calculation unit 140 determines whether equalization has ended. Specifically, based on the detection results of the voltage sensors 130 to 134, it is determined whether or not the voltage difference between the battery cell having the lowest voltage and the other battery cells is equal to or less than the predetermined voltage β. In step S116, when it is determined that at least one of the voltage differences between the battery cell having the lowest voltage and the other battery cells is not equal to or lower than the predetermined voltage β, the SOC calculation unit 140 determines that all the voltage differences are the predetermined voltage β. The same determination is repeated until the following.

  On the other hand, when it is determined in step S116 that the voltage difference between the battery cell having the lowest voltage and the other battery cells is all equal to or less than the predetermined voltage β, the SOC calculation unit 140 detects the voltage sensor 10 in step S117. The OCV is obtained after equalizing the assembled battery B1. Then, in step S118, based on the preset relationship between the OCV and the SOC of the assembled battery B1, the post-equalized SOC of the assembled battery B1 is calculated from the obtained equalized OCV of the assembled battery B1. Further, in step S119, the equalized difference SOC of the assembled battery B1 is calculated.

  Thereafter, the full charge capacity calculation determination unit 143 determines whether or not to calculate the minimum full charge capacity in step S120. Specifically, whether the difference SOC after equalization of the assembled battery B1 is larger than a predetermined value γ, whether the charge / discharge time is shorter than a predetermined time δ, whether both the voltage sensor 10 and the current sensor 11 are normal Determine whether or not.

  When it is determined in step S120 that the post-equalization difference SOC of the assembled battery B1 is greater than the predetermined value γ, the charge / discharge time is less than the predetermined time δ, and both the voltage sensor 10 and the current sensor 11 are normal, the full charge capacity The calculation determination unit 143 permits calculation of the minimum full charge capacity.

  In step S121, the full charge capacity calculation unit 144 calculates the pre-charge / discharge SOC calculated by the SOC calculation unit 140, the post-equalization SOC calculated by the SOC calculation unit 140, and the integrated current amount calculated by the integrated current amount calculation unit 141. Based on the above, the minimum full charge capacity of the battery pack B1 is calculated. Specifically, the minimum full charge capacity of the battery pack B1 is calculated based on the post-equalization difference SOC calculated by the SOC calculation unit 140 and the integrated current amount calculated by the integrated current amount calculation unit 141. More specifically, the minimum full charge capacity is calculated based on Equation (2).

  Thereafter, in step S122, the full charge capacity correction unit 145 corrects the calculated minimum full charge capacity of the assembled battery B1. Specifically, based on a predetermined calculation formula from the corrected minimum full charge capacity calculated last time stored in the full charge capacity storage unit 146 and the minimum full charge capacity calculated by the full charge capacity calculation unit 144 this time, Calculate the corrected minimum full charge capacity. More specifically, the new minimum full charge capacity corrected based on the equation (4) is calculated. Then, in step S123, the full charge capacity correction unit 145 updates the corrected minimum full charge capacity as a new minimum full charge capacity, and stores it in the full charge capacity storage unit 146.

  On the other hand, if it is determined in step S120 that the post-equalization difference SOC of the assembled battery B1 is equal to or smaller than the predetermined value γ, the influence of the error included in the post-equalization difference SOC becomes large, and the accuracy of the minimum full charge capacity decreases. Therefore, step S121 to step S123 are not performed. Further, when it is determined that the charge / discharge time is equal to or longer than the predetermined time δ, the influence of the offset error of the current sensor 11 is increased and the accuracy of the accumulated current amount is lowered, and accordingly, the accuracy of the minimum full charge capacity is also lowered. Steps S121 to S123 are not performed. Further, when it is determined that at least one of the voltage sensor 10 and the current sensor 11 is abnormal, the reliability of the OCV and the accumulated current amount is low, and thus Steps S121 to S123 are not performed. That is, when the post-equalization difference SOC of the assembled battery B1 is equal to or less than the predetermined value γ, when the charge / discharge time is equal to or longer than the predetermined time δ, or when at least one of the voltage sensor 10 and the current sensor 11 is abnormal, In the case of at least one, the calculation of the minimum full charge capacity by the full charge capacity calculation unit 144 and the calculation of the corrected minimum full charge capacity by the full charge capacity correction unit 145 are stopped.

  As shown in FIG. 4, the start switch is turned on at time t1 when a predetermined time has elapsed from time t0 when the start switch was turned off last time. That is, the start switch is turned on at time t1 when a predetermined time has elapsed from time t0 when the previous charging / discharging period ended. When the time from time t0 to time t1 is equal to or greater than the relaxation time α, it is determined that the influence of the polarization of the battery cells C10 to C14 has been sufficiently relaxed, and the SOC calculation unit 140 recharges the assembled battery B1 at time t2. The pre-discharge OCV is acquired, and the pre-charge / discharge SOC of the battery pack B1 is calculated. However, if the time from time t0 to time t1 has not reached the relaxation time α, it is determined that the influence of the polarization of the battery cells C10 to C14 is not sufficiently relaxed, and the average full charge capacity of the battery pack B1 and Stop calculating the minimum full charge capacity.

  Thereafter, the system main relays R10 and R11 are turned on at time t3, and the charge / discharge period starts. When the charging / discharging period starts, the integrated current amount calculation 141 integrates the current flowing through the assembled battery B1. The charge / discharge time calculation unit 142 measures time in order to calculate the time of the charge / discharge period. When the charging / discharging period starts and, for example, power is supplied from the assembled battery B1 to the in-vehicle device and the assembled battery B1 continues to be discharged without being charged, the voltage of the battery cells C10 to C14 decreases. The rate of voltage decrease of the battery cells C10 to C14 varies depending on the variation in the internal state. Thereafter, the start switch is turned off at time t4, and accordingly, the system main relays R10 and R11 are also turned off, and the charging / discharging period ends. The accumulated current amount calculation unit 141 completes the calculation of the accumulated current amount of the assembled battery B1 during the charge / discharge period at time t4. The charge / discharge time calculation unit 142 completes the calculation of the charge / discharge period time at time t4.

  When the charging / discharging period ends, the influence of polarization is gradually relaxed, and the voltages of the battery cells C10 to C14 vary. The SOC calculation unit 140 obtains the OCV after charge / discharge of the battery pack B1 at time t5 after the relaxation time α has elapsed from time t4, calculates the SOC after charge / discharge of the battery pack B1, and charges / discharges the battery pack B1. The post-difference SOC is calculated.

  At time t5, the battery cell C13 has the lowest voltage among the battery cells C10 to C14. The equalization is started from time t5 so that the voltage difference between the battery cell C13 having the lowest voltage and the other battery cells C10 to C12, C14 is all equal to or less than the predetermined voltage β. The equalization ends at time t6 when the voltage difference between the battery cell C13 having the lowest voltage and the other battery cells C10 to C12, C14 is all equal to or lower than the predetermined voltage β.

  The SOC calculation unit 140 obtains the post-equalization SOCV of the battery pack B1 at time t7 after the end of the equalization, calculates the post-equalization SOC of the battery pack B1, and calculates the post-equalization difference SOC of the battery pack B1. calculate.

  The full charge capacity calculation determination unit 143 determines whether or not to calculate the average full charge capacity after time t5. When it is determined that the difference SOC after charging / discharging of the battery pack B1 is larger than the predetermined value γ, the charging / discharging time is shorter than the predetermined time δ, and both the voltage sensor 10 and the current sensor 11 are normal, the full charge capacity calculation determination unit 143 Allows the calculation of the average full charge capacity. The full charge capacity calculation unit 144 calculates the average full charge capacity of the battery pack B1 based on the post-charge / discharge difference SOC calculated by the SOC calculation unit 140 and the integrated current amount calculated by the integrated current amount calculation unit 141. Specifically, the average full charge capacity of the battery pack B1 is calculated based on the formula (1). The full charge capacity correction unit 145 calculates a predetermined calculation formula from the corrected average full charge capacity calculated last time stored in the full charge capacity storage unit 146 and the average full charge capacity calculated by the full charge capacity calculation unit 144 this time. Based on this, the corrected average full charge capacity is calculated. Specifically, a new average full charge capacity corrected based on Equation (3) is calculated. Then, the corrected average full charge capacity is updated as a new average full charge capacity and stored in the full charge capacity storage unit 146.

  On the other hand, when the difference SOC after charging / discharging of the assembled battery B1 is equal to or less than the predetermined value γ, when the charging / discharging time is equal to or longer than the predetermined time δ, or when at least one of the voltage sensor 10 and the current sensor 11 is abnormal, In the case of at least one, the calculation of the average full charge capacity by the full charge capacity calculation unit 144 and the calculation of the average full charge capacity corrected by the full charge capacity correction unit 145 are stopped.

  The full charge capacity calculation determination unit 143 determines whether or not to calculate the minimum full charge capacity after time t7. When it is determined that the post-equalization difference SOC of the assembled battery B1 is greater than the predetermined value γ, the charge / discharge time is less than the predetermined time δ, and both the voltage sensor 10 and the current sensor 11 are normal, the full charge capacity calculation determination unit 143 Allows the calculation of the minimum full charge capacity. The full charge capacity calculation unit 144 calculates the minimum full charge capacity of the battery pack B1 based on the post-equalization difference SOC calculated by the SOC calculation unit 140 and the integrated current amount calculated by the integrated current amount calculation unit 141. Specifically, the minimum full charge capacity is calculated based on Equation (2). The full charge capacity correction unit 145 calculates a predetermined calculation formula from the corrected minimum full charge capacity calculated in the previous time stored in the full charge capacity storage unit 146 and the minimum full charge capacity calculated by the full charge capacity calculation unit 144 this time. Based on this, the corrected minimum full charge capacity is calculated. Specifically, a new minimum full charge capacity corrected based on equation (4) is calculated. Then, the corrected minimum full charge capacity is updated as a new minimum full charge capacity and stored in the full charge capacity storage unit 146.

  On the other hand, when the differential SOC after equalization of the assembled battery B1 is equal to or less than the predetermined value γ, when the charge / discharge time is equal to or longer than the predetermined time δ, or when at least one of the voltage sensor 10 and the current sensor 11 is abnormal, In the case of at least one, the calculation of the minimum full charge capacity by the full charge capacity calculation unit 144 and the calculation of the corrected minimum full charge capacity by the full charge capacity correction unit 145 are stopped.

  Next, the effect of the full charge capacity calculation device of the present embodiment will be described.

  According to the present embodiment, the full charge capacity calculation device 14 flows to the assembled battery B1 during the charging / discharging period of the assembled battery B1, and the SOC calculating unit 140 that calculates the SOC of the assembled battery B1 based on the OCV of the assembled battery B1. An integrated current amount calculating unit 141 that calculates an integrated current amount that is an integrated value of current, an SOC before and after charging of the assembled battery B1 calculated by the SOC calculating unit 140 based on the OCV before charging and discharging of the assembled battery B1, and an assembled battery Based on the post-equalization SOC of the battery pack B1 calculated by the SOC calculation unit 140 based on the post-equalization OCV of B1 and the integrated current amount calculated by the integrated current amount calculation unit 141, the full charge capacity is calculated. And a charge capacity calculation unit 144.

  The battery cells C10 to C14 constituting the assembled battery B1 are equalized so that the voltage difference between the battery with the lowest voltage and the other battery cells is all equal to or lower than a predetermined voltage. OCV and SOC have a predetermined relationship. Therefore, the SOC before charge / discharge of each of the battery cells C10 to C14 is substantially the same as the SOC before charge / discharge of the battery cell having the smallest full charge capacity. After the relaxation time α has elapsed since the end of the charge / discharge period, the battery cells C10 to C14 are equalized so that the voltage difference between the battery cell with the lowest voltage and the other battery cells is all equal to or lower than the predetermined voltage. . Therefore, the post-equalization SOC of the assembled battery B1 is substantially the same as the post-equalization SOC of the battery cell having the smallest full charge capacity. The full charge capacity can be calculated based on the SOC in one state, the SOC in another state, and the accumulated current amount therebetween. Therefore, the minimum full charge capacity of the assembled battery B1 can be calculated from the pre-charge / discharge SOC of the assembled battery B1, the post-equalization SOC of the assembled battery B1, and the integrated current amount during the charge / discharge period. That is, the full charge capacity of the battery pack B1 can be calculated without calculating the full charge capacity of each of the battery cells C10 to C14.

  According to the present embodiment, the SOC calculation unit 140 charges / recharges the assembled battery B1 based on the pre-charge / discharge OCV of the assembled battery B1 after the time equal to or greater than the relaxation time α has elapsed since the end of the previous charge / discharge period. The pre-discharge SOC is calculated. Therefore, the SOC before charging / discharging of the assembled battery B1 can be calculated based on the OCV before charging / discharging of the assembled battery B1 in which the influence of polarization is sufficiently mitigated. Therefore, it is possible to suppress the SOC error before charging / discharging the assembled battery B1.

  According to the present embodiment, the full charge capacity calculation unit 144 determines that the voltage sensor 10 and the current when the difference SOC after equalization of the assembled battery B1 is equal to or less than the predetermined value γ, the charge / discharge time is equal to or greater than the predetermined time δ. When at least one of the sensors 11 is abnormal, if it is at least one, the calculation of the minimum full charge capacity is stopped.

  The minimum full charge capacity is calculated based on the formula (2). When the differential SOC after the equalization of the assembled battery B1 is equal to or less than the predetermined value γ, the influence of the error included in the post-equalization difference SOC becomes large, and the accuracy of the minimum full charge capacity decreases. Therefore, when the post-equalization difference SOC of the assembled battery B1 is equal to or less than the predetermined value γ, it is possible to suppress a decrease in accuracy of the minimum full charge capacity by stopping the calculation of the minimum full charge capacity. In addition, when the charge / discharge time is equal to or longer than the predetermined time δ, the influence of the offset error of the current sensor 11 is increased, the accuracy of the accumulated current amount is lowered, and accordingly, the accuracy of the minimum full charge capacity is also lowered. Therefore, when the charging / discharging time is equal to or longer than the predetermined time δ, by stopping the calculation of the minimum full charge capacity, it is possible to suppress a decrease in the accuracy of the minimum full charge capacity due to a decrease in the accuracy of the integrated current amount. Furthermore, when at least one of the voltage sensor 10 and the current sensor 11 is abnormal, the reliability of the OCV and the accumulated current amount is lowered, and accordingly, the reliability of the minimum full charge capacity is also lowered. Therefore, when at least one of the voltage sensor 10 and the current sensor 11 is abnormal, it is possible to suppress a decrease in the reliability of the minimum full charge capacity by stopping the calculation of the minimum full charge capacity.

  According to the present embodiment, the full charge capacity calculation device 14 includes the corrected minimum full charge capacity calculated last time stored in the full charge capacity storage unit 146 and the minimum full charge calculated this time by the minimum full charge capacity calculation unit. A full charge capacity correction unit 145 that calculates a minimum full charge capacity corrected based on a predetermined calculation formula from the capacity is provided.

  The minimum full charge capacity has an error. There is a possibility that the error included in the previously calculated minimum full charge capacity and the presently calculated minimum full charge capacity may vary greatly. However, the full charge capacity correction unit 145 performs a predetermined calculation from the corrected minimum full charge capacity calculated last time stored in the full charge capacity storage unit 146 and the minimum full charge capacity calculated this time by the minimum full charge capacity calculation unit. The minimum full charge capacity corrected based on the equation is calculated. Therefore, it is possible to suppress the influence due to the error included in the minimum full charge capacity.

  According to the present embodiment, the full charge capacity correction unit 145 includes a voltage sensor and a current sensor when the post-equalization difference SOC of the assembled battery B1 is a predetermined value γ or less, a charge / discharge time is a predetermined time δ or more, If at least one of the two is abnormal, the calculation of the corrected minimum full charge capacity is stopped.

  As described above, when the post-equalization difference SOC of the assembled battery B1 is equal to or smaller than the predetermined value γ, when the charge / discharge time is equal to or longer than the predetermined time δ, or when at least one of the voltage sensor and the current sensor is abnormal In the case of at least one, the accuracy and reliability of the minimum full charge capacity is lowered. Therefore, when the post-equalization difference SOC of the assembled battery B1 is equal to or less than the predetermined value γ, the charge / discharge time is equal to or greater than the predetermined time δ, or at least one of the voltage sensor and the current sensor is abnormal. Therefore, by stopping the calculation of the corrected minimum full charge capacity, it is possible to suppress a decrease in accuracy and a decrease in reliability of the corrected minimum full charge capacity.

  According to the present embodiment, the full charge capacity calculation unit 144 is after the charging / discharging of the assembled battery B1 calculated by the SOC calculating unit 140 based on the SOC before charging / discharging of the assembled battery B1 and the OCV after charging / discharging of the assembled battery B1. An average full charge capacity is calculated based on the SOC and the integrated current amount.

  Since the minimum full charge capacity is calculated based on the post-equalization SOC, it is calculated after the equalization. The time required for equalization varies depending on the state of each of the battery cells C10 to C14. If the time required for equalization becomes longer, the time until the minimum full charge capacity is calculated becomes longer. If the start switch is turned on and the battery pack B1 is used before the equalization is completed and the minimum full charge capacity is calculated, or if this situation continues many times, the minimum The charge capacity is not calculated and is not updated. As a result, when the control is performed based on the minimum full charge capacity, the control may be adversely affected. However, the average full charge capacity is calculated based on the SOC after charging / discharging of the assembled battery B1. Therefore, the average full charge capacity is calculated earlier than the minimum full charge capacity. Moreover, the average full charge capacity is greater than the minimum full charge capacity, but is unlikely to be significantly different. Accordingly, by calculating the average full charge capacity, when the minimum full charge capacity has not been calculated over a long period of time, the average full charge capacity can be used instead of the minimum full charge capacity. As a result, it is possible to suppress an adverse effect due to a delay in calculating the minimum full charge capacity.

  According to the present embodiment, the full charge capacity calculation unit 144 determines that the voltage sensor 10 and the current are charged when the post-charge / discharge difference SOC of the assembled battery B1 is equal to or smaller than the predetermined value γ, when the charge / discharge time is equal to or longer than the predetermined time δ. When at least one of the sensors 11 is abnormal, the calculation of the average full charge capacity is stopped when at least one of the sensors 11 is abnormal.

  The average full charge capacity is calculated based on the formula (1). When the difference SOC after charging / discharging of the assembled battery B1 is equal to or less than the predetermined value γ, the influence of the error included in the difference SOC after charging / discharging becomes large, and the accuracy of the average full charge capacity decreases. Therefore, when the post-charge / discharge difference SOC of the assembled battery B1 is equal to or less than the predetermined value γ, the accuracy of the average full charge capacity can be prevented from decreasing by stopping the calculation of the average full charge capacity. Further, when the charging / discharging time is equal to or longer than the predetermined time δ, the influence of the offset error of the current sensor 11 is increased, the accuracy of the accumulated current amount is lowered, and accordingly, the accuracy of the average full charge capacity is also lowered. Therefore, when the charging / discharging time is equal to or longer than the predetermined time δ, by stopping the calculation of the average full charge capacity, it is possible to suppress a decrease in the accuracy of the average full charge capacity due to a decrease in the accuracy of the integrated current amount. Furthermore, when at least one of the voltage sensor 10 and the current sensor 11 is abnormal, the reliability of the OCV and the accumulated current amount is lowered, and accordingly, the reliability of the average full charge capacity is also lowered. Therefore, when at least one of the voltage sensor 10 and the current sensor 11 is abnormal, it is possible to suppress a decrease in the reliability of the average full charge capacity by stopping the calculation of the average full charge capacity.

  According to the present embodiment, the full charge capacity correction unit 145 includes the corrected average full charge capacity calculated last time stored in the full charge capacity storage unit 146 and the average full charge calculated this time by the average full charge capacity calculation unit. An average full charge capacity corrected based on a predetermined calculation formula is calculated from the capacity.

  The average full charge capacity has an error. There is a possibility that the error included in the average full charge capacity calculated last time and the average full charge capacity calculated this time fluctuate greatly. However, the full charge capacity correction unit 145 performs a predetermined calculation from the corrected average full charge capacity calculated last time stored in the full charge capacity storage unit 146 and the average full charge capacity calculated by the average full charge capacity calculation unit this time. The average full charge capacity corrected based on the formula is calculated. Therefore, it is possible to suppress the influence due to the error included in the average full charge capacity.

  According to the present embodiment, the full charge capacity correction unit 145 includes a voltage sensor and a current sensor when the post-charge / discharge difference SOC of the assembled battery B1 is equal to or less than the predetermined value γ, and when the charge / discharge time is equal to or greater than the predetermined time δ. If at least one of the two is abnormal, the calculation of the corrected average full charge capacity is stopped.

  As described above, when the post-charge / discharge difference SOC of the assembled battery B1 is equal to or smaller than the predetermined value γ, when the charge / discharge time is equal to or longer than the predetermined time δ, or when at least one of the voltage sensor 10 and the current sensor 11 is abnormal. In the case of at least one of them, the accuracy and reliability of the average full charge capacity is lowered. Therefore, when the difference SOC after charging / discharging of the assembled battery B1 is equal to or less than the predetermined value γ, when the charge / discharge time is equal to or longer than the predetermined time δ, or when at least one of the voltage sensor 10 and the current sensor 11 is abnormal, In the case of at least one, by stopping the calculation of the corrected average full charge capacity, it is possible to suppress a decrease in accuracy and a decrease in reliability of the corrected average full charge capacity.

  In the present embodiment, an example in which the battery pack C1 includes five battery cells C10 to C14 connected in series is described, but the present invention is not limited to this. The assembled battery should just be comprised by the some battery cell connected in series.

  In the present embodiment, the full charge capacity calculation unit 144 has an annealing constant k1 for calculating the corrected average full charge capacity and an annealing constant k2 for calculating the corrected minimum full charge capacity separately. An example is given, but it is not limited to this. The annealing constants k1 and k2 may be the same value or different values. Further, the value may be varied according to the situation.

  In the present embodiment, the full charge capacity correction unit 145 calculates an average full charge capacity corrected based on the equations (3) and (4) and a corrected minimum full charge capacity. It is not limited to this. You may make it calculate based on another predetermined calculation formula.

  DESCRIPTION OF SYMBOLS 1 ... Battery pack control system, 10 ... Voltage sensor, 11 ... Current sensor, 12 ... Equalization circuit, 14 ... Full charge capacity calculation apparatus, 140 ... SOC calculation part, 141 ... accumulated current amount calculation unit, 142 ... charge / discharge time calculation unit, 143 ... full charge capacity calculation determination unit, 144 ... full charge capacity calculation unit, 145 ... full charge capacity correction unit, 146: full charge capacity storage unit, B1: assembled battery, C10 to C14: battery cell

Claims (9)

A full charge capacity calculation device for calculating a full charge capacity of an assembled battery composed of a plurality of battery cells connected in series,
An SOC calculation unit (140) for calculating an SOC (State Of Charge) of the assembled battery based on an OCV (Open Circuit Voltage) of the assembled battery;
An integrated current amount calculation unit (141) that calculates an integrated current amount that is an integrated value of a current flowing through the assembled battery during a charge / discharge period of the assembled battery;
The SOC before charging / discharging of the assembled battery calculated by the SOC calculation unit based on the OCV before charging / discharging of the assembled battery before the start of the charging / discharging period, and the relaxation time (α) have elapsed since the charging / discharging period ended. Then, the battery pack of the assembled battery after equalization for discharging other battery cells so that the voltage difference between the battery cell having the lowest voltage and the other battery cells is all equal to or lower than a predetermined voltage (β). Minimum full charge for calculating the minimum full charge capacity based on the post-equalization SOC of the assembled battery calculated by the SOC calculation unit based on the post-equalization OCV and the integrated current amount calculated by the integrated current amount calculation unit A capacity calculator (144);
A full charge capacity calculation device.   The SOC calculation unit calculates the pre-charge / discharge SOC of the assembled battery based on the pre-charge / discharge OCV of the assembled battery after a time equal to or greater than the relaxation time has elapsed since the end of the previous charge / discharge period. The full charge capacity calculation device according to 1.   When the difference SOC after equalization, which is the difference between the pre-charge / discharge SOC of the battery pack and the post-equalization SOC, is equal to or less than a predetermined value (γ), the minimum full charge capacity calculation unit calculates the charge / discharge time for a predetermined time (δ ) When the above is true, at least one of the voltage sensor provided for detecting the OCV of the assembled battery and the current sensor provided for calculating the integrated current amount of the assembled battery is abnormal 3. The full charge capacity calculation device according to claim 1, wherein the calculation of the minimum full charge capacity is stopped when the number is at least one.   A minimum full charge capacity correction unit (145) for calculating a minimum full charge capacity corrected based on a predetermined calculation formula from the previously calculated minimum full charge capacity and the minimum full charge capacity calculated this time by the minimum full charge capacity calculation unit. The full charge capacity calculation apparatus according to any one of claims 1 to 3.   When the difference SOC after equalization, which is the difference between the pre-charge / discharge SOC and the post-equalization SOC of the battery pack, is equal to or less than a predetermined value (γ), the minimum full charge capacity correction unit is configured to charge / discharge time for a predetermined time (δ ) When the above is true, at least one of the voltage sensor provided for detecting the OCV of the assembled battery and the current sensor provided for calculating the integrated current amount of the assembled battery is abnormal 5. The full charge capacity calculation device according to claim 4, wherein calculation of the corrected minimum full charge capacity is stopped when the number is at least one.   After charging / discharging of the assembled battery calculated by the SOC calculation unit based on the SOC before charging / discharging of the assembled battery and the OCV after charging / discharging of the assembled battery after the relaxation time has elapsed after the end of the charging / discharging period. The full charge capacity calculation device according to any one of claims 1 to 5, further comprising an average full charge capacity calculation unit (144) that calculates an average full charge capacity based on the SOC and the integrated current amount.   The average full charge capacity calculation unit, when a post-charge / discharge difference SOC that is a difference between the pre-charge / discharge SOC of the battery pack and the post-charge / discharge SOC is equal to or less than a predetermined value (γ), ) If this is the case, at least one of the voltage sensor provided for detecting the OCV of the assembled battery and the current sensor provided for calculating the integrated current amount of the assembled battery is abnormal. The full charge capacity calculation device according to claim 6, wherein the calculation of the average full charge capacity is stopped when the number of cases is at least one.   An average full charge capacity correction unit (145) for calculating an average full charge capacity corrected based on a predetermined calculation formula from the previously calculated average full charge capacity and the average full charge capacity calculated this time by the average full charge capacity calculation unit. The full charge capacity calculation apparatus according to claim 6 or 7, wherein:   The average full charge capacity correction unit is configured such that when the post-charge / discharge difference SOC, which is the difference between the pre-charge / discharge SOC of the battery pack, is equal to or less than a predetermined value (γ), the charge / discharge time is a predetermined time (δ ) If this is the case, at least one of the voltage sensor provided for detecting the OCV of the assembled battery and the current sensor provided for calculating the integrated current amount of the assembled battery is abnormal. The full charge capacity calculation apparatus according to claim 8, wherein the calculation of the corrected average full charge capacity is stopped when there is at least one of the cases.

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