JP2010017000A - Controller for electricity accumulator, and vehicle - Google Patents

Abstract

An object of the present invention is to suppress overcharge of a power storage element.
A control device for a battery B in which a plurality of battery blocks B0 to Bn including a plurality of single cells are connected in series, and the value of a current used for charging the battery B is limited as the storage rate of the battery B increases. The control unit 14 for controlling the charging operation of the battery B, the voltage detection unit 11 for detecting the voltage value of each of the battery blocks B0 to Bn, and the plurality of battery blocks B0 to Bn included in the plurality of battery blocks B0 to Bn. When any one of the single cells exceeds a threshold value (for example, 4.25 V), an abnormality detection unit 13 that performs abnormality notification is provided. When abnormality is detected by the abnormality detection unit 13, the control unit 14 performs a charging operation according to a virtual storage rate higher than the storage rate of the maximum storage block having the highest voltage value among the plurality of battery blocks B0 to Bn. The charging operation of the battery B is controlled so as to be performed.
[Selection] Figure 3

Description

  The present invention relates to a power storage unit control device and a vehicle for controlling charging of a power storage unit including a plurality of power storage elements.

  In recent years, hybrid vehicles, electric vehicles, and the like have attracted attention against the background of environmental problems. These vehicles are equipped with a power storage device as a power source. Generally, a power storage device mounted on these vehicles is configured by connecting a plurality of battery blocks including a plurality of single cells in series.

  FIG. 8 shows the voltage value of each single cell included in each conventional battery block, FIG. 8 (A) shows the state during charging, and FIG. 8 (B) shows the state during charging. ing. When the unit cell has a voltage value higher than the upper limit element voltage value, battery deterioration proceeds. When the unit cell has a voltage value lower than the lower limit element voltage value, battery deterioration proceeds.

  The first to fourth battery blocks 111 to 141 are connected in series. The first battery block 111 includes first to fifth unit cells 111a to 111e, the second battery block 121 includes first to fifth unit cells 121a to 121e, and the third battery block 131 includes the first cell block 131. The fourth battery block 141 includes first to fifth unit cells 141a to 141e.

  A voltage detection sensor (not shown) is attached to each of the battery blocks 111 to 141, and a controller (not shown) controls a charging operation and a discharging operation of the power storage device based on a voltage signal output from the voltage detection sensor. The controller is charged so that the power storage amount of the power storage device is limited to a predetermined range (for example, 40 to 80%) centered on a target power storage amount (for example, 60%) that is a target value of the power storage amount of the power storage device. Control operation and discharge operation.

In the state of charge of the power storage device, the controller has a power storage upper limit value (80%) in which the power storage rate of the fourth battery block 141 having the highest voltage value among the first to fourth battery blocks 111 to 141 is within the predetermined range. The charging operation is controlled so as not to reach the target. In the discharged state of the power storage device, the controller has a power storage lower limit (40%) in which the power storage rate of the third battery block 131 having the lowest voltage value among the first to fourth battery blocks 111 to 141 is within the predetermined range. The discharge operation is controlled so as not to reach the point.
JP 2000-14029 A JP 2007-110841 A JP 2007-151334 A

  However, in the state of charge shown in FIG. 8A, the fifth cell 121e of the second battery block 121 has reached the upper limit element voltage value, and the amount of charge stored in the fourth battery block 141 and the predetermined amount When there is a margin between the upper limit value of the range, charging is continuously performed at a high current value. For this reason, the fifth single battery 121e of the second battery block 121 is overcharged exceeding the upper limit element voltage value, and as a result, the battery life may be shortened.

  8B, the fourth unit cell 111d of the first battery block 111 has reached the lower limit element voltage value, and the amount of charge stored in the third battery block 131 and the predetermined amount When there is a margin between the lower limit of the range, discharge is continuously performed at a high current value. For this reason, the 4th single cell 111d of the 1st battery block 111 exceeds the minimum element voltage value, and is overdischarged, As a result, there exists a possibility that a battery life may become short.

  This invention makes it the 1st objective to suppress the overcharge of an electrical storage element. Moreover, this invention makes it the 2nd objective to suppress the overdischarge of an electrical storage element.

  In order to achieve the first object, a power storage device control device according to the present invention is (1) a power storage device control device in which a plurality of power storage blocks including a plurality of power storage elements are connected in series, A control unit for controlling the charging operation of the power storage unit such that the value of the current used for charging the power storage unit is limited as the storage rate of the battery increases, and voltage detection for detecting the voltage value of each power storage block And when the voltage value of any of the plurality of power storage elements included in the plurality of power storage blocks exceeds a threshold value, an abnormality is detected by the abnormality detection unit and the abnormality detection unit. The control unit performs the charging operation of the power storage unit so that the charging operation is performed according to a virtual storage rate higher than the storage rate of the maximum storage block having the highest voltage value among the plurality of storage blocks. Feature to control To.

  According to the configuration of (1), when the voltage value exceeds a threshold value in any of the power storage elements, the charging operation is performed at a virtual power storage rate higher than the actual power storage rate. The power storage element can be protected.

  (2) In the configuration of (1), an average voltage value obtained by dividing the threshold value and the voltage value of the maximum power storage block by the number of power storage elements included in the maximum power storage block, rather than the power storage rate of the maximum power storage block. A value that is higher by the corrected power storage rate corresponding to the voltage difference between and can be used as the virtual power storage rate.

  According to the configuration of (2), charging is more effectively limited, and the storage element can be protected.

  (3) In the configuration of (1) or (2), the information processing apparatus includes a memory that stores relationship information indicating a relationship between a voltage value of the power storage element and a power storage rate, and the control unit is stored in the memory. The corrected power storage rate can be calculated from the relationship information.

  According to the configuration of (3), an accurate corrected power storage rate can be calculated from the relationship information stored in advance in the memory.

  (4) In the configurations of (1) to (3), it is preferable that the control unit controls the charging operation of the power storage unit so that the power storage rate of the maximum power storage block does not exceed a predetermined upper limit power storage rate.

  In order to achieve the second object, a power storage device control device according to the present invention is (1) a power storage device control device in which a plurality of power storage blocks including a plurality of power storage elements are connected in series, A control unit for controlling the discharging operation of the power storage unit such that the current value of the power storage unit discharge is limited as the amount of stored power decreases, and a voltage detection unit for detecting the voltage value of each power storage block; When any one of the plurality of power storage elements included in the plurality of power storage blocks has a voltage value lower than a threshold value, when an abnormality is detected by the abnormality detection unit and the abnormality detection unit The control unit controls the discharging operation of the power storage unit so that a discharging operation according to a virtual power storage rate lower than a power storage rate of the lowest power storage block having the lowest voltage value among the plurality of power storage blocks is performed. It is characterized by.

  According to the configuration of (1), when the voltage value is lower than the threshold value in any one of the power storage elements, the discharge operation is performed at a virtual power storage rate lower than the actual power storage rate, so that the discharge is more limited, The power storage element can be protected.

  (2) In the configuration of (1), an average voltage value obtained by dividing the threshold value and the voltage value of the minimum power storage block by the number of power storage elements included in the minimum power storage block, rather than the power storage rate of the minimum power storage block. A value that is lower by the amount of corrected power storage corresponding to the voltage difference can be used as the virtual power storage rate.

  (3) In the configuration of (1) or (2), the information processing apparatus includes a memory that stores relationship information indicating a relationship between a voltage value of the power storage element and a power storage rate, and the control unit is stored in the memory. The corrected power storage rate can be calculated from the relationship information.

  According to the configuration of (3), an accurate corrected power storage rate can be calculated from the relationship information stored in advance in the memory.

  (4) In the configurations of (1) to (3), it is preferable that the control unit controls the discharging operation of the power storage unit so that the power storage rate of the minimum power storage block does not become lower than a predetermined lower limit power storage rate. .

  The control device for each power storage unit can be mounted on a vehicle.

  According to the present invention, overcharge of a power storage element can be suppressed. According to the present invention, overdischarge of the electricity storage element can be suppressed.

Examples of the present invention will be described below.
Example 1
FIG. 1 is a block diagram of a hybrid vehicle 1 of the present embodiment. The hybrid vehicle 1 also uses an engine and a motor as a driving power source. Hybrid vehicle 1 includes front wheels 20R, 20L, rear wheels 22R, 22L, engine 2, planetary gear 16, differential gear 18, gears 4, 6, and control unit 14.

  The hybrid vehicle 1 further includes a battery (power storage unit) B arranged at the rear of the vehicle, a monitoring unit 10 that monitors the voltage and current of the battery B, a boosting unit 32 that boosts DC power output from the battery B, It includes an inverter 36 that exchanges DC power with the boosting unit 32, a motor generator MG1 that is connected to the engine 2 via the planetary gear 16 and mainly generates electric power, and a motor generator MG2 whose rotating shaft is connected to the planetary gear 16. . Inverter 36 is connected to motor generators MG <b> 1 and MG <b> 2 and performs conversion between AC power and DC power from booster unit 32.

  Planetary gear 16 has first to third rotation shafts, and is connected to engine 2, motor generator MG1, and motor generator MG2, respectively. A gear 4 is attached to the third rotating shaft, and the gear 4 transmits power to the differential gear 18 by driving the gear 6. The differential gear 18 transmits the power received from the gear 6 to the front wheels 20R and 20L, and transmits the rotational force of the front wheels 20R and 20L to the third rotating shaft of the planetary gear 16 via the gears 6 and 4.

  Planetary gear 16 divides power among engine 2, motor generator MG1, and motor generator MG2. That is, if the rotation of two of the three rotation shafts of the planetary gear 16 is determined, the rotation of the remaining one rotation shaft is forcibly determined. Therefore, the vehicle 2 is controlled by controlling the power generation amount of the motor generator MG1 and driving the motor generator MG2 while operating the engine 2 in the most efficient region, thereby realizing an overall energy efficient vehicle. Yes. A reduction gear that reduces the rotation of motor generator MG2 and transmits it to planetary gear 16 may be provided, or a reduction gear that can change the reduction ratio of the reduction gear may be provided.

  The battery B supplies DC power to the boosting unit 32 and is charged by DC power supplied from the boosting unit 32. As the battery B, a secondary battery such as a nickel metal hydride battery or a lithium ion battery can be used. Battery B is an assembled battery and includes a plurality of battery blocks (storage blocks) B0 to Bn. These battery blocks B0 to Bn are connected in series. The battery block B0 includes a plurality of single cells (storage elements) b01 to b0n (see FIG. 2). Battery block Bn includes a plurality of single cells bn1 to bnn. Other battery blocks have the same configuration. The number of single cells included in each of the battery blocks B0 to Bn is the same.

  The monitoring unit 10 includes a voltage detection unit (voltage detection unit) 11, a current sensor 12, and an abnormality detection unit 13. The voltage detection unit 11 detects the voltages V0 to Vn (block voltages) of the plurality of battery blocks B0 to Bn and outputs the detection results to the control unit 14. When the voltage value of any of the cells b01 to bnn included in the battery blocks B0 to Bn is outside a predetermined range (described later), the abnormality detection unit 13 controls the flag FLG to be on. The unit 14 is notified of the abnormality.

  Boost unit 32 boosts the DC voltage received from battery B and supplies the boosted DC voltage to inverter 36. Inverter 36 converts the supplied DC voltage into AC voltage, and drives and controls motor generator MG1 when the engine is started. Further, after the engine is started, AC power generated by motor generator MG1 is converted into DC by inverter 36, and converted to a voltage suitable for charging battery B by boosting unit 32, and battery B is charged.

  Inverter 36 drives motor generator MG2. Motor generator MG2 assists engine 2 to drive front wheels 20R and 20L. At the time of braking, motor generator MG2 performs a regenerative operation and converts the rotational energy of the wheels into electric energy. The obtained electric energy is returned to the battery B via the inverter 36 and the booster unit 32. Between the boost unit 32 and the battery B, system main relays 28 and 30 are provided for connecting the battery B and the boost unit 32 during vehicle operation. When the vehicle is not in operation, the system main relays 28 and 30 are de-energized and the high voltage is cut off.

  The control unit 14 controls the engine 2, the inverter 36, the booster unit 32, and the system main relays 28 and 30 according to the driver's instructions and outputs from various sensors attached to the vehicle, and charges / discharges the battery B. Take control.

FIG. 2 is a diagram showing peripheral devices related to the functional blocks of the control unit 14 of FIG. In the figure, the voltage detector 11 includes a plurality of voltage sensors 710 to 71n. These voltage sensors 710 to 71n detect the block voltage values of the battery blocks B0 to Bn, respectively, and output the results to the control unit 14. Current sensor 12 detects the value of current flowing through battery B.
The control unit 14 controls the state of charge (SOC) of the battery B based on the block voltage values V0 to Vn detected by the voltage detection unit 11, the current value IB received from the current sensor 12, and the like.

  Specifically, at the time of charging the battery B, an upper limit storage rate (for example, 80%), where the storage rate of the largest battery block having the highest block voltage value among the plurality of battery blocks B0 to Bn is the upper limit of the storage rate. %), The charging operation of the battery B is controlled. When the battery B is discharged, the storage rate of the smallest battery block having the lowest block voltage value among the plurality of battery blocks B0 to Bn is stored. The discharging operation of battery B is controlled so as not to be lower than a lower limit storage rate (for example, 40%) that is a lower limit of the rate. These upper limit power storage rate and lower limit power storage rate can be appropriately changed according to the type of the battery B and the like from the viewpoint of preventing overcharge and overdischarge of the battery B.

  Further, the control unit 14 controls the charging operation of the battery B so that the charging of the battery B is reduced as the storage rate of the maximum battery block approaches the upper limit storage rate when the battery B is charged. When the battery B is discharged, the discharge operation of the battery B is controlled such that the discharge of the battery B is reduced as the storage rate of the minimum battery block approaches the lower limit storage rate.

  The control unit 14 is provided with an internal memory (memory) 14a, and the internal memory 14a has a cell upper limit voltage value (threshold according to claim 1) and a cell lower limit voltage value (claim) of the single cells b01 to bnn. 6) is stored. For the internal memory 14a, RAM or ROM can be used. When the voltage value of the cells b01 to bnn becomes higher than the cell upper limit voltage value at the time of charging, the battery deterioration proceeds. When the voltage value of the cells b01 to bnn becomes lower than the cell lower voltage value at the time of charging, the battery deterioration proceeds. To do. In this embodiment, the cell upper limit voltage value and the cell lower limit voltage value are set to 4.25 V and 1.40 V, respectively, but can be appropriately changed according to the types of the cells b01 to bnn.

  The internal memory 14a of the control unit 14 stores information (relation information) indicating the relationship between the storage rate of the single cell and the voltage value. Specifically, a data table representing the correspondence relationship between the storage rate and the voltage value according to the curve shown in FIG. 4 is stored in the internal memory 14a. However, a functional expression representing the curve shown in FIG. 4 can be stored in the internal memory 14a. The curve in FIG. 4 is design information determined according to the types of the unit cells b01 to bnn. The internal memory 14 a may be provided outside the control unit 14.

  The abnormality detection unit 13 performs an OR operation (logical OR operation) on the outputs of the overcharge / overdischarge detection units 750 to 75n provided corresponding to the battery blocks B0 to Bn and the overcharge / overdischarge detection units 750 to 750n. OR circuit 76. The overcharge / overdischarge detection unit 750 includes a plurality of abnormality determination units 78 provided corresponding to the plurality of single cells b01 to bnn, respectively.

  Each abnormality determination unit 78 indicates that the unit cells b01 to bnn are abnormal when the voltage value of the corresponding unit cells b01 to bnn is higher than the cell upper limit voltage value and lower than the cell lower limit voltage value. Therefore, the logical value of the output is changed from “0” to “1”. Since overcharge / overdischarge detection units 750-75n have the same configuration as overcharge / overdischarge detection unit 750, the following description will not be repeated.

  The OR circuit 76 turns on the flag FLG (sets the logical value of the flag FLG to “1”) when the logical value of any one of the plurality of abnormality determination units 78 is “1”, otherwise, When the logical values of the outputs of the plurality of abnormality determination units 78 are all “0”, the flag FLG is turned off (the logical value of the flag FLG is set to “0”).

  The abnormality detection unit 13 and the control unit 14 are electrically and mechanically connected via a signal line 41 (FIG. 1), and when the flag FLG is turned on, the signal is transmitted via the signal line 41 to the control unit. 14 is output. Therefore, the control unit 14 can determine that any of the cells b01 to bnn included in the battery blocks B0 to Bn has reached an overcharge or overdischarge state. However, it is not possible to specify a single cell that has been overcharged or overdischarged.

  Thus, by connecting the abnormality detection unit 13 and the control unit 14 with a single wire, the cost can be reduced as compared with the configuration in which each abnormality determination unit 78 and the control unit 14 are connected with a plurality of wires.

  Next, the charging operation of the battery B will be described using the flowchart of FIG. FIG. 3 is a flowchart showing a control method for controlling the battery charging operation. The following flowchart is executed by the control unit 14.

  In step S101, it is determined whether or not the flag FLG of the abnormality detection unit 10 is turned on. If it is determined in step S101 that the FLG flag has been turned on, the process proceeds to step S102. If it is determined in step S101 that the flag FLG is not turned on, the process proceeds to step S107.

  In step S102, the cell upper limit voltage value (4.25V) is read from the internal memory 14a, and the battery block having the highest block voltage value based on the voltage information output from the voltage detector 11 (in this embodiment, the battery block B1). The block voltage value of the battery block B1 is divided by the number (n) of the single cells b11 to b1n included in the battery block B1, and the average block voltage value (according to claim 2) is determined. (Average voltage value) is calculated, and the voltage difference ΔV is calculated by subtracting the average block voltage value from the cell upper limit voltage value.

  In step S103, ΔSOC (corrected charge rate) is calculated based on the information indicating the relationship between the charge rate and the voltage value illustrated in FIG. 4 stored in the memory 14a and the voltage difference ΔV calculated in step S102.

  In step S104, ΔSOC calculated in step S103 is added to the storage rate of battery block B1 to calculate a virtual storage rate. In step S105, the charging operation of the battery B is controlled based on the virtual power storage rate. FIG. 5 is a schematic diagram for explaining a charging operation based on the virtual power storage rate, in which the horizontal axis indicates time and the vertical axis indicates the power storage rate. In the figure, assuming that the actual storage rate of battery block B1 is 62% and ΔSOC is 10%, the virtual storage rate of battery block B1 is calculated to be 72%.

  Here, as described above, the control unit 14 limits the charging as the storage rate of the battery block having the highest block voltage value among the battery blocks B0 to Bn approaches the upper limit storage rate (80%). The charging operation of the battery B is controlled. Therefore, the control unit 14 controls the charging operation of the battery B, assuming that the storage rate of the battery block B1 is actually 62% even if it is 62%, and thus more effectively restricts the charging. Can do.

  Thereby, the single cell (one of the single cells b01 to bnn but not specified) that has reached the cell upper limit voltage value can be protected. Further, it is not necessary to provide a voltage detection sensor for each of the cells b01 to bnn and monitor the voltage value, so that the cost can be reduced.

  In step S106, it is determined whether or not the flag FLG of the abnormality detection unit 10 has been turned off. If flag FLG remains on, the process returns to step S105, and the charging operation of battery B is controlled based on the virtual power storage rate. In step S107, the charging operation is controlled based on the storage rate of the battery block having the highest block voltage value among the battery blocks B0 to Bn.

  Next, the discharging operation of the battery B will be described using the flowchart of FIG. FIG. 6 is a flowchart showing a control method for controlling the discharging operation of the battery. The following flowchart is executed by the control unit 14.

  In step S201, it is determined whether the flag FLG of the abnormality detection unit 10 is turned on. If it is determined in step S201 that the FLG flag has been turned on, the process proceeds to step S202. If it is determined in step S201 that the FLG flag is not turned on, the process proceeds to step S207.

  In step S202, the cell lower limit voltage value (1.40V) is read from the internal memory 14a, and the battery block having the lowest block voltage value based on the voltage information output from the voltage detector 11 (in this embodiment, the battery block B2). The block voltage value of the battery block B2 is divided by the number (n) of the single cells b21 to b2n included in the battery block B2, and an average block voltage value is calculated. The voltage difference ΔV is calculated by subtracting the cell lower limit voltage value from the voltage value.

  In step S203, ΔSOC is calculated based on the information indicating the relationship between the storage rate and the voltage value illustrated in FIG. 4 stored in the memory 14a and the voltage difference ΔV calculated in step S202.

  In step S204, the virtual storage rate is calculated by subtracting ΔSOC calculated in step S203 from the storage rate of battery block B2. In step S205, the discharging operation of the battery B is controlled based on the virtual power storage rate. FIG. 7 is a schematic diagram for explaining the discharge operation based on the virtual power storage rate. The horizontal axis represents time, and the vertical axis represents the storage rate. In the figure, assuming that the actual storage rate of battery block B2 is 55% and ΔSOC is 10%, the virtual storage rate of battery block B2 is calculated as 45%.

  Here, as described above, the control unit 14 limits the discharge as the storage rate of the battery block having the lowest block voltage value among the battery blocks B1 to Bn approaches the lower limit storage rate (40%). The discharging operation of the battery B is controlled. Therefore, the control unit 14 controls the discharging operation of the battery B, assuming that the power storage rate of the battery block B1 is actually 55% even when it is 55%. Can do.

  Thereby, the single cell (one of the single cells b01 to bnn but not specified) that has reached the cell lower limit voltage value can be protected. Further, it is not necessary to provide a voltage detection sensor for each of the cells b01 to bnn and monitor the voltage value, so that the cost can be reduced.

  In step S206, it is determined whether or not the flag FLG of the abnormality detection unit 10 has been turned off. If the flag FLG remains on, the process returns to step S205, and the discharging operation of the battery B is controlled based on the virtual power storage rate. In step S207, the discharge operation is controlled based on the storage rate of the battery block having the lowest block voltage value among the battery blocks B0 to Bn.

Thereby, the single cell (one of the single cells b01 to bnn but not specified) that has reached the cell lower limit voltage value can be protected. Further, it is not necessary to provide a voltage detection sensor for each of the cells b01 to bnn and monitor the voltage value, so that the cost can be reduced.
(Modification)
The virtual power storage rate is not limited to the above-described embodiment. For example, when the variation range of ΔSOC is known in advance by simulation, the virtual storage rate is calculated by adding the maximum value of the variation range to the storage rate of the battery block having the highest block voltage value, and calculating the virtual storage rate. The charging operation of the battery B may be controlled based on the rate, the virtual storage rate is calculated by subtracting the maximum value of the fluctuation range from the storage rate of the battery block having the lowest block voltage value, and based on the virtual storage rate The discharging operation of the battery B may be controlled.

  That is, an embodiment in which overcharging of a single cell can be prevented by charging at a storage rate higher than that of the battery block having the highest block voltage value is within the scope of the present invention. In addition, an embodiment in which overdischarge of the unit cell can be prevented by discharging at a storage rate lower than the storage rate of the battery block having the lowest block voltage value is within the scope of the present invention.

  Only one of the charge control according to the flowchart of FIG. 3 and the discharge control according to the flowchart of FIG. 6 may be executed. A known method can be used for the other control.

It is a block diagram of a hybrid vehicle. It is the figure which showed the peripheral device relevant to the functional block of a control part. It is a flowchart which shows the control method at the time of controlling the charging operation of a battery. It is an OCV map showing the correspondence between the storage rate and the voltage value. It is a schematic diagram for demonstrating the charging operation based on a virtual electrical storage rate. It is the flowchart which showed the control method at the time of controlling the discharge operation of a battery. It is a schematic diagram for demonstrating the discharge operation | movement based on a virtual electrical storage rate. The voltage value of the conventional cell is shown, (A) is at the time of charge, (B) is at the time of discharge.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Monitoring unit 11 Voltage detection part 13 Abnormality detection part 14 Control part 710-71n Voltage detection sensor B Battery B1-Bn Battery block b01-bnn Cell

Claims (10)

A control device for a power storage unit in which a plurality of power storage blocks including a plurality of power storage elements are connected in series,
A control unit that controls a charging operation of the power storage unit such that a value of a current used for charging the power storage unit is limited as the power storage rate of the power storage unit increases;
A voltage detection unit for detecting a voltage value of each power storage block;
When any voltage value of the plurality of power storage elements included in the plurality of power storage blocks exceeds a threshold, an abnormality detection unit that performs abnormality notification;
When an abnormality is detected by the abnormality detection unit, the control unit performs a charging operation according to a virtual storage rate higher than the storage rate of the maximum storage block having the highest voltage value among the plurality of storage blocks. As described above, a power storage unit control device that controls a charging operation of the power storage unit.   The virtual power storage rate is a voltage difference between the threshold value and an average voltage value obtained by dividing the voltage value of the maximum power storage block by the number of power storage elements included in the maximum power storage block, rather than the power storage rate of the maximum power storage block. 2. The power storage device control device according to claim 1, wherein the power storage unit control device is higher by an amount corresponding to a corrected power storage rate corresponding to. A memory storing relationship information indicating a relationship between a voltage value of the power storage element and a power storage rate;
The said control part calculates the said corrected electrical storage rate from the said relationship information memorize | stored in the said memory, The control apparatus of the electrical storage body of Claim 1 or 2 characterized by the above-mentioned.   4. The storage battery control according to claim 1, wherein the virtual storage rate is lower than an upper limit storage rate that is a design upper limit value of the storage rate of the maximum storage block. 5. apparatus.   A vehicle equipped with the power storage device control device according to claim 1. A control device for a power storage unit in which a plurality of power storage blocks including a plurality of power storage elements are connected in series,
A control unit for controlling a discharging operation of the power storage unit such that a current value of discharging of the power storage unit is limited as a power storage amount of the power storage unit decreases;
A voltage detection unit for detecting a voltage value of each power storage block;
When any voltage value of the plurality of power storage elements included in the plurality of power storage blocks is lower than a threshold value, an abnormality detection unit that performs abnormality notification;
When an abnormality is detected by the abnormality detection unit, the control unit performs a discharge operation according to a virtual power storage rate lower than the power storage rate of the lowest power storage block having the lowest voltage value among the plurality of power storage blocks. As described above, a control device for a power storage unit that controls a discharging operation of the power storage unit.   The virtual storage rate is a voltage difference between the threshold and the average voltage value obtained by dividing the voltage value of the minimum storage block by the number of the storage elements included in the minimum storage block, rather than the storage rate of the minimum storage block. The power storage device control device according to claim 6, wherein the power storage unit control device is low by an amount corresponding to a corrected power storage amount corresponding to. A memory storing relationship information indicating a relationship between a voltage value of the power storage element and a power storage rate;
8. The storage battery control apparatus according to claim 6, wherein the control unit calculates the corrected power storage rate from the relation information stored in the memory. 9.   The storage battery control according to any one of claims 6 to 8, wherein the virtual storage rate is higher than a lower limit storage rate that is a design lower limit value of the storage rate of the minimum storage block. apparatus. A vehicle equipped with the power storage device control device according to any one of claims 6 to 9.

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