JP6365222B2 - Control apparatus and control method - Google Patents

Description

  The present invention relates to a technique for controlling a current flowing in a battery pack having a plurality of batteries.

  In a battery pack having a plurality of batteries, the currents flowing through the batteries at the time of charging or discharging differ from each other due to variations in the internal resistance of the batteries. If the currents flowing through each battery are different from each other, even if the current flowing through the battery pack is controlled so that the current flowing through the battery does not exceed the allowable current of the battery, the current flowing through the other battery If the allowable current is exceeded, the battery may be deteriorated.

  As a related technique, for example, there is a technique of controlling the current flowing through the battery pack so that the current flowing through each battery does not exceed the allowable current of the corresponding battery. For example, see Patent Document 1.

Japanese Patent Laid-Open No. 2004-215559

  The present invention suppresses the current flowing through each battery from exceeding the allowable current of the corresponding battery even when the currents flowing through the batteries differ from each other due to variations in the internal resistance of the plurality of batteries included in the battery pack. It is an object of the present invention to provide a control device and a control method capable of controlling a current flowing in a pack.

  The control device according to the present embodiment is a control device that controls a current flowing through a battery pack having a plurality of batteries connected in parallel, and includes an allowable current acquisition unit, a current threshold setting unit, and a current control unit.

The allowable current acquisition unit acquires the allowable current of each battery.
The current threshold setting unit sets the minimum value of the allowable currents of the batteries as the threshold.
The current control unit controls the current flowing through the battery pack so that the current flowing through each battery is smaller than the threshold value.

  The present invention suppresses the current flowing through each battery from exceeding the allowable current of the corresponding battery even when the currents flowing through the batteries differ from each other due to variations in the internal resistance of the plurality of batteries included in the battery pack. The current flowing through the pack can be controlled.

It is a figure which shows an example of the control apparatus of this embodiment. It is a flowchart which shows an example of operation | movement of a control part. It is a flowchart which shows an example of operation | movement of a control part when controlling the electric current which flows into a battery pack so that the electric current which flows through each battery may become smaller than the allowable electric current of a corresponding battery, respectively. It is a flowchart which shows an example of operation | movement of a control part when converting the electric current detected by an electric current detection part from an analog value to a digital value.

FIG. 1 is a diagram illustrating an example of a control device according to the present embodiment.
The control device 1 shown in FIG. 1 is mounted on a vehicle such as an electric forklift or a plug-in hybrid vehicle, for example, and flows through a battery pack having a plurality of batteries 2 (2-1 to 2-n) connected in parallel to each other. To control. Each battery 2 is composed of a plurality of secondary batteries (for example, lithium ion batteries) connected in series. Each battery 2 may be constituted by one secondary battery.

  When charging the battery pack, an external charger 3 provided outside the vehicle supplies electric power according to the current command value Ic1 transmitted from the control unit 10 of the control device 1 to the vehicle, and is provided inside the vehicle. The charger 4 supplies the power supplied from the external charger 3 to the battery pack. The electric power supplied to the battery pack is supplied to each battery 2, and each battery 2 is charged. When the target current value It1 for performing constant current / constant voltage charging or the like is smaller than the current limit value Il, the control unit 10 transmits the target current value It1 to the external charger 3 as the current command value Ic1, and the target current When the value It1 is equal to or greater than the current limit value Il, the current limit value Il is transmitted to the external charger 3 as the current command value Ic1. In addition, when the target current value It1 is equal to or greater than the current limit value Il, when the current limit value Il decreases, the current command value Ic1 decreases and the current flowing through the battery pack decreases. When the current flowing through the battery pack is reduced, the current flowing through each battery 2 is also reduced.

  When the vehicle travels, the power conversion unit 6 provided in the vehicle responds to the current command value Ic2 transmitted from the control unit 10 with the DC power supplied from the battery pack when the travel motor 5 consumes power. It is converted into AC power and supplied to the traveling motor 5. When the target current value It2 transmitted from the travel control unit 12 is smaller than the current limit value Il, the control unit 10 transmits the target current value It2 to the power conversion unit 6 as the current command value Ic2, and the target current value It2 is When the current limit value Il is equal to or greater than the current limit value Il, the current limit value Il is transmitted to the power conversion unit 6 as the current command value Ic2. Further, when the target current value It2 is equal to or greater than the current limit value Il and the current limit value Il is small, the output current of the power conversion unit 6 is small and the current flowing through the battery pack is small. When the current flowing through the battery pack is reduced, the current flowing through each battery 2 is also reduced. The traveling control unit 15 receives the current limit value Il transmitted from the control unit 10, and when the target current value It2 is smaller than the current limit value Il, the power conversion unit 15 uses the target current value It2 as the current command value Ic2. When the target current value It2 is equal to or greater than the current limit value Il, the current limit value Il may be transmitted to the power conversion unit 6 as the current command value Ic2. In the case of such a configuration, the control unit 10 only needs to obtain the current limit value Il without performing a size comparison between the target current value It2 and the current limit value Il.

  The control device 1 includes a plurality of voltage detection units 7 (7-1 to 7-n), a plurality of current detection units 8 (8-1 to 8-n), and a plurality of temperature detection units 9 (9-1 to 9-1). 9-n), a control unit 10, and a storage unit 11. For example, the voltage detection unit 7 includes a voltage sensor, the current detection unit 8 includes a current sensor, and the temperature detection unit 9 includes a temperature sensor. Further, the control unit 10 and the travel control unit 15 are configured by a CPU (Central Processing Unit), a multi-core CPU, and programmable devices (FPGA (Field Programmable Gate Array), PLD (Programmable Logic Device), etc.). The storage unit 11 includes a RAM (Random Access Memory), a ROM (Read Only Memory), and the like.

The voltage detector 7-1 detects the voltage V1 of the battery 2-1. The voltage detector 7-2 detects the voltage V2 of the battery 2-2. Further, the voltage detection unit 7-n detects the voltage Vn of the battery 2-n.
The current detector 8-1 detects the current I1 flowing through the battery 2-1. The current detection unit 8-2 detects the current I2 flowing through the battery 2-2. Further, the current detection unit 8-n detects the current In flowing through the battery 2-n.

The temperature detector 9-1 detects the temperature T1 of the battery 2-1. The temperature detector 9-2 detects the temperature T2 of the battery 2-2. Further, the temperature detection unit 9-n detects the temperature Tn of the battery 2-n.
The control unit 10 controls the current flowing through the battery pack so that the currents I1 through In flowing through the batteries 2-1 through 2-n are smaller than the threshold value Ith.

  The control unit 10 includes an allowable current acquisition unit 101, a current threshold setting unit 102, and a current control unit 103. The allowable current acquisition unit 101, the current threshold setting unit 102, and the current control unit 103 are realized by, for example, a CPU or the like reading and executing a program stored in the storage unit 11.

  The allowable current acquisition unit 101 includes voltages V1 to Vn detected by the voltage detection units 7-1 to 7-n, currents I1 to In detected by the current detection units 8-1 to 8-n, and a temperature detection unit 9. Based on the temperatures T1 to Tn detected by -1 to 9-n, the allowable currents Ia1 to Ian corresponding to the batteries 2-1 to 2-n are obtained.

The current threshold setting unit 102 sets the minimum value of the allowable currents Ia1 to Ian acquired by the allowable current acquisition unit 101 as the threshold Ith.
When at least one of the currents I1 to In becomes equal to or greater than a threshold value Ith that is the minimum value of the allowable currents Ia1 to Ian, the current control unit 103 limits the current until all of the currents I1 to In become smaller than the threshold value Ith. Decrease value Il. Thus, the current flowing through the battery pack can be controlled so that the current flowing through each battery 2 is smaller than the minimum value of the allowable current of each battery 2 when the battery pack is charged or the vehicle is traveling.

FIG. 2 is a flowchart illustrating an example of the operation of the control unit 10.
First, when running of the vehicle or charging of the battery pack is started, the allowable current acquisition unit 101 acquires the allowable currents Ia1 to Ian of the batteries 2-1 to 2-n (S21).

  Next, the current threshold value setting unit 102 sets the minimum value among the allowable currents Ia1 to Ian acquired by the allowable current acquisition unit 101 as the threshold value Ith, and the threshold value Ith × (the number n of parallel batteries 2 to be connected). Is set to the current limit value Il (S22).

Next, the current control unit 103 determines whether or not at least one of the currents I1 to In detected by the current detection units 8-1 to 8-n is equal to or greater than the threshold value Ith (S23).
If the current control unit 103 determines that at least one of the currents I1 to In is equal to or greater than the threshold value Ith (S23: Yes), the current limit value Il is decreased by a certain value (S24), and the vehicle running or It is determined whether charging of the battery pack is completed (S25).

  Further, when the current control unit 103 determines that all of the currents I1 to In are smaller than the threshold value Ith (S23: No), the current control unit 103 determines whether traveling of the vehicle or charging of the battery pack is completed (S25).

  Next, when it is determined that driving of the vehicle or charging of the battery pack has not ended (S25: No), the allowable current acquisition unit 101 acquires the allowable currents Ia1 to Ian (S26), and a current threshold setting unit. 102 sets the minimum value of the allowable currents Ia1 to Ian to the threshold value Ith (S27), and returns to S23.

Further, when it is determined that the vehicle travels or the battery pack has been charged (S25: Yes), the control process for the current flowing through the battery pack is terminated.
Thereby, the control device 1 of the embodiment flows through the battery pack so that the current flowing through each battery 2 is smaller than the minimum value of the allowable current of each battery 2 when the battery pack is charged or when the vehicle is running. Since the current can be controlled, even when the currents flowing through the batteries 2 are different from each other due to variations in internal resistance of the batteries 2, the currents flowing through the batteries 2 exceed the allowable currents of the corresponding batteries 2, respectively. It is possible to control the current flowing in the battery pack while suppressing the above.

The control unit 10 may be configured to control the current flowing through the battery pack such that the currents I1 to In are smaller than the corresponding allowable currents Ia1 to Ian.
FIG. 3 is a flowchart illustrating an example of the operation of the control unit 10 when controlling the current flowing through the battery pack so that the currents I1 to In are smaller than the corresponding allowable currents Ia1 to Ian.

First, when driving of the vehicle or charging of the battery pack is started, the allowable current acquisition unit 101 acquires the allowable currents Ia1 to Ian of the batteries 2-1 to 2-n (S31).
Next, the current threshold setting unit 102 obtains the minimum value of the allowable currents Ia1 to Ian acquired by the allowable current acquisition unit 101, and limits the minimum value × (the number n of parallel connected batteries 2) as a current limit. The value Il is set (S32).

  Next, the current control unit 103 determines whether or not the currents I1 to In detected by the current detection units 8-1 to 8-n are equal to or more than the corresponding allowable currents Ia1 to Ian (S33). That is, the current control unit 103 determines whether or not the current I1 detected by the current detection unit 8-1 is greater than or equal to the allowable current Ia1, and the current In detected by the current detection unit 8-n. Is greater than or equal to the allowable current Ian.

  When the current control unit 103 determines that at least one of the currents I1 to In is equal to or larger than the allowable current Ia corresponding to the current I (S33: Yes), the current control value Il is decreased by a certain value. (S34), it is determined whether traveling of the vehicle or charging of the battery pack is completed (S35).

  Further, when the current control unit 103 determines that the currents I1 to In are smaller than the corresponding allowable currents Ia1 to Ian (S33: No), the current control unit 103 determines whether the vehicle travels or the battery pack is completely charged. (S35).

Next, when it is determined that the vehicle is not running or the battery pack is not charged (S35: No), the allowable currents Ia1 to Ian are acquired (S36), and the process returns to S33.
Further, when it is determined that the vehicle travels or the battery pack is completely charged (S35: Yes), the control process for the current flowing through the battery pack is terminated.

  Thereby, when charging the battery pack or driving the vehicle, the current flowing through each battery 2 can be controlled so that the current flowing through each battery 2 becomes smaller than the allowable current of the corresponding battery 2. Even when the currents flowing through the batteries 2 are different from each other due to variations in the internal resistance of the batteries 2, the currents flowing through the batteries 2 are controlled so as not to exceed the allowable currents of the corresponding batteries 2. can do.

FIG. 4 is a flowchart illustrating an example of the operation of the control unit 10 when the current detected by the current detection unit 8 is converted from an analog value to a digital value.
First, the control unit 10 determines whether or not the battery pack is being charged (S41).

  Next, when the control unit 10 determines that the battery pack is being charged (S41: Yes), the currents I1 to In detected by the current detection units 8-1 to 8-n are compared to when the vehicle is traveling. The input range when converting the analog value into the digital value (AD conversion) is narrowed (S42).

Moreover, if the control part 10 judges that the vehicle is drive | working (S41: No), it will not change the input range when converting the electric currents I1-In from an analog value into a digital value.
Thereby, during charging of the battery pack, LSB (Least Significant Bit) when converting the currents I1 to In from an analog value to a digital value can be made smaller than when the vehicle is running. In can be detected with high accuracy, and control processing of the current flowing through the battery pack can be performed with higher accuracy.

<Example of Allowable Current Acquisition Unit 101 and Current Threshold Setting Unit 102>
For example, the allowable current acquisition unit 101 includes first to fourth allowable current acquisition units corresponding to the elements 1 to 4, respectively.

  The first allowable current acquisition unit is configured based on the SOC (State Of Charge: the ratio of the current capacity of the battery 2 based on the full capacity of the battery 2) and the temperature (element 1). 1 allowable current Ia11 ”to“ allowable current Ia1n of battery 2-n ”.

  For example, the first allowable current acquisition unit corresponds to the voltage V1 detected by the voltage detection unit 7-1 with reference to the “voltage-SOC map” indicating the correspondence between the voltage of the battery 2 and the SOC. The SOC is acquired as the SOC1 of the battery 2-1. The first allowable current acquisition unit refers to the “voltage-SOC map” and obtains “SOC2 of the battery 2-2 corresponding to the voltage V2” to “SOCn of the battery 2-n corresponding to the voltage Vn”. get. Next, the first allowable current acquisition unit displays the correspondence relationship between the SOC of the battery 2 and the allowable current for each predetermined temperature (for example, 40 ° C., 25 ° C., 0 ° C., −10 ° C.). Of the “allowable current map”, referring to the “SOC-allowable current map” corresponding to the temperature T1 detected by the temperature detector 9-1, the allowable current corresponding to SOC1 is set as the allowable current Ia1 of the battery 2-1. get. The first allowable current acquisition unit refers to each “SOC-allowable current map” corresponding to the temperatures T2 to Tn, and corresponds to “allowable current Ia2 of the battery 2-2 corresponding to SOC2” to “SOCn”. To obtain the allowable current Ian of the battery 2-n.

The second allowable current acquisition unit acquires “allowable current Ia21 of battery 2-1” to “allowable current Ia2n of battery 2-n” based on information (element 2) relating to overcharge / discharge suppression of battery 2. .
For example, the second allowable current acquisition unit acquires predetermined allowable currents Ia21 to Ia2n from the storage unit 11 when normal (when the batteries 2-1 to 2-n are not in an overcharged state or an overdischarged state). To do. Further, when the second allowable current acquisition unit determines that the voltage V1 detected by the voltage detection unit 7-1 is equal to or lower than the threshold value Vth and the battery 2-1 is in an overdischarged state, the allowable current of the battery 2-1 Ia21 is reduced. When the second allowable current acquisition unit determines that the voltage V1 detected by the voltage detection unit 7-1 is greater than the threshold value Vth and the battery 2-1 is no longer in an overdischarged state, the second allowable current acquisition unit The current Ia21 is returned to the original value. Further, the second allowable current acquisition unit changes the allowable currents Ia22 to Ia2n according to the overcharge / discharge states of the batteries 2-2 to 2-n.

The third allowable current acquisition unit acquires “allowable current Ia31 of battery 2-1” to “allowable current Ia3n of battery 2-n” based on the abnormal level (element 3) of battery 2.
For example, the third allowable current acquisition unit acquires predetermined allowable currents Ia31 to Ia3n from the storage unit 11 when normal (when no abnormality occurs in the batteries 2-1 to 2-n). Further, the third allowable current acquisition unit decreases the allowable current Ia31 when a level 1 abnormality (for example, an abnormality in which the temperature T1 becomes equal to or higher than the threshold Tth1) occurs in the battery 2-1. Further, the third allowable current acquisition unit further increases the allowable current compared to level 1 when a level 2 abnormality (for example, an abnormality in which the temperature T1 is greater than or equal to the threshold value Tth2) occurs in the battery 2-1. Ia31 is reduced. In addition, when an abnormality occurs in the batteries 2-2 to 2-n, the third allowable current acquisition unit changes the allowable currents Ia32 to Ia3n according to the abnormality level.

The fourth allowable current acquisition unit acquires “allowable current Ia41 of battery 2-1” to “allowable current Ia4n of battery 2-n” based on information (element 4) related to suppression of deposition of battery 2.
For example, the fourth allowable current acquisition unit may calculate the degree of deterioration of the battery 2 (for example, the current internal resistance ratio based on the past internal resistance of the battery 2 or the current capacity based on the past capacity of the battery 2. In the “Voltage-Temperature-Allowable Current Map” in which the correspondence relationship between the voltage, the temperature, and the allowable current of the battery 2 when the deposition of the battery 2 is suppressed is shown for each ratio) of the battery 2-1. With reference to the “voltage-temperature-allowable current map” corresponding to the degree of deterioration, the allowable current corresponding to the voltage V1 detected by the voltage detector 7-1 and the temperature T1 detected by the temperature detector 9-1 is obtained. Obtained as the allowable current Ia41 of the battery 2-1. Further, the fourth allowable current acquisition unit refers to each “voltage-temperature-allowable current map” corresponding to the degree of deterioration of the batteries 2-2 to 2-n, and is detected by the “voltage detection unit 7-2”. Voltage V2 and allowable current Ia42 corresponding to temperature T2 detected by temperature detector 9-2 "to" voltage Nn detected by voltage detector 7-n and temperature Tn detected by temperature detector 9-n " The allowable current Ia4n corresponding to “is acquired.

Then, the current threshold setting unit 102 sets the minimum value among all the allowable currents acquired by the first to fourth allowable current acquisition units as the threshold Ith.
The allowable current acquisition unit 101 includes at least two of the first to fourth allowable current acquisition units, and the current threshold setting unit 102 includes the allowable current acquired by the at least two allowable current acquisition units. Of these, the minimum value may be set to the threshold value Ith.

<Other Examples of Allowable Current Acquisition Unit 101 and Current Threshold Setting Unit 102>
For example, the allowable current acquisition unit 101 includes first to nth allowable current acquisition units corresponding to the batteries 2-1 to 2-n, respectively.

  The first allowable current acquisition unit acquires allowable currents Ia11 to Ia41 corresponding to the elements 1 to 4 for the battery 2-1. The second allowable current acquisition unit acquires allowable currents Ia12 to Ia42 corresponding to the elements 1 to 4 for the battery 2-2, respectively. The nth allowable current acquisition unit acquires allowable currents Ia1n to Ia4n corresponding to the elements 1 to 4 for the battery 2-n.

  That is, the first allowable current acquisition unit acquires the allowable current Ia11 of the battery 2-1 based on the SOC1 and the temperature T1 of the battery 2-1, and based on the information regarding the overcharge / discharge suppression of the battery 2-1. Then, the allowable current Ia21 of the battery 2-1 is acquired, the allowable current Ia31 of the battery 2-1 is acquired based on the abnormal level of the battery 2-1, and the battery is determined based on the information on the deposition suppression of the battery 2-1. The allowable current Ia41 of 2-1 is acquired. The second allowable current acquisition unit acquires the allowable current Ia12 of the battery 2-2 based on the SOC2 and the temperature T2 of the battery 2-2, and determines the battery based on information related to overcharge / discharge suppression of the battery 2-2. The allowable current Ia22 of 2-2 is acquired, the allowable current Ia32 of the battery 2-2 is acquired based on the abnormal level of the battery 2-2, and the battery 2- 2 allowable current Ia42 is acquired. Further, the nth allowable current acquisition unit acquires the allowable current Ia1n of the battery 2-n based on the SOCn and the temperature Tn of the battery 2-n, and based on the information related to the overcharge / discharge suppression of the battery 2-n. Then, the allowable current Ia2n of the battery 2-n is acquired, the allowable current Ia3n of the battery 2-n is acquired based on the abnormal level of the battery 2-n, and the battery is determined based on the information on the deposition suppression of the battery 2-n. The 2-n allowable current Ia4n is acquired.

Then, the current threshold setting unit 102 sets the minimum value of all the allowable currents acquired by the first to nth allowable current acquisition units as the threshold Ith.
Each of the first to nth allowable current acquisition units acquires an allowable current corresponding to at least two of the elements 1 to 4, and the current threshold setting unit 102 includes the first to nth allowable currents. You may comprise so that the minimum value of the allowable current acquired by an electric current acquisition part may be set to the threshold value Ith.

<Other embodiments>
The control unit 10 sets “input / output power W1 of the battery 2-1” to “input / output power Wn of the battery 2-n” to “allowable power Wa1 of the battery 2-1” to “allowable power Wan of the battery 2-n”. The input / output power of the battery pack may be controlled so as to be smaller than the threshold value Wth which is the minimum value of “”.

When configured in this manner, the control unit 10 includes an allowable power acquisition unit, a power threshold setting unit, and a power control unit.
The allowable power acquisition unit includes voltages V1 to Vn detected by the voltage detection units 7-1 to 7-n, currents I1 to In detected by the current detection units 8-1 to 8-n, and a temperature detection unit 9-. Based on the temperatures T1 to Tn detected by 1 to 9-n, “allowable power Wa1 of battery 2-1” to “allowable power Wan of battery 2-n” are acquired. For example, similar to the allowable current acquisition unit 101, the allowable power acquisition unit acquires the allowable currents Ia1 to Ian, and multiplies the acquired allowable currents Ia1 to Ian by the voltages of the batteries 2 respectively. The electric power Wa1-Wan is obtained.

The power threshold setting unit sets the minimum value among the allowable powers Wa1 to Wa acquired by the allowable power acquisition unit as the threshold Wth.
When at least one of the input / output powers W1 to Wn is equal to or greater than the threshold value Wth when the battery pack is charged or the vehicle is running, the input / output power W1 to Wn is reduced to less than the threshold value Wth. Decrease current limit value Il.

  As a result, the control device 1 according to another embodiment allows the input / output power of each battery 2 to be smaller than the minimum value of the allowable power of each battery 2 when the battery pack is charged or the vehicle is running. Since the input / output power of the pack can be controlled, the input / output power of each battery 2 is different from that of the corresponding battery 2 even when the currents flowing through the batteries 2 are different from each other due to variations in the internal resistance of each battery 2. The input / output power of the battery pack can be controlled while preventing the allowable power from being exceeded.

DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Battery 3 External charger 4 Internal charger 5 Driving motor 6 Power conversion part 7 Voltage detection part 8 Current detection part 9 Temperature detection part 10 Control part 11 Storage part 15 Traveling control part 101 Allowable current acquisition part 102 Current Threshold setting unit 103 Current control unit

Claims (7)

A control device for controlling a current flowing in a battery pack having a plurality of batteries connected in parallel,
An allowable current acquisition unit for acquiring the allowable current of each battery;
A current threshold setting unit that sets a minimum value of the allowable current of each battery as a threshold; and
A current control unit that controls a current flowing through the battery pack so that a current flowing through each battery is smaller than the threshold;
A control device comprising: The control device according to claim 1,
The input range for converting the current flowing through each battery from an analog value to a digital value during charging of the battery pack is smaller than during traveling of a vehicle on which the battery pack is mounted. Control device. The control device according to claim 1 or 2,
The allowable current acquisition unit includes:
A first allowable current acquisition unit that acquires the allowable current of each battery based on the SOC and temperature of each battery;
A second allowable current acquisition unit for acquiring an allowable current of each battery based on information on suppression of overcharge / discharge of each battery;
A third allowable current acquisition unit that acquires the allowable current of each battery based on the abnormal level of each battery;
A fourth allowable current acquisition unit that acquires the allowable current of each battery based on information on the deposition suppression of each battery;
Including at least two allowable current acquisition units,
The control device, wherein the current threshold value setting unit sets a minimum value of allowable currents respectively acquired by the at least two allowable current acquisition units as the threshold value. The control device according to claim 1 or 2,
The allowable current acquisition unit includes:
Among the batteries, the allowable current of the first battery based on the SOC and temperature of the first battery, the allowable current of the first battery based on information related to suppression of overcharge / discharge of the first battery, the first A first current that obtains at least two permissible currents out of the permissible current of the first battery based on the abnormal level of the first battery and the permissible current of the first battery based on information related to the suppression of deposition of the first battery. 1 allowable current acquisition unit;
Among the batteries, an allowable current of the second battery based on the SOC and temperature of the second battery, an allowable current of the second battery based on information on suppression of overcharge / discharge of the second battery, the second The second battery obtains at least two allowable currents out of the allowable current of the second battery based on the abnormal level of the second battery and the allowable current of the second battery based on information related to the suppression of deposition of the second battery. Two allowable current acquisition units;
With
The control unit, wherein the current threshold setting unit sets a minimum value of the allowable currents acquired by the first and second allowable current acquisition units as the threshold. A control method for controlling a current flowing in a battery pack having a plurality of batteries connected in parallel,
Obtaining the allowable current of each battery,
Set the minimum value of the allowable current of each battery as a threshold,
The control method characterized by controlling the electric current which flows into the said battery pack so that the electric current which flows through each said battery may become smaller than the said threshold value. A control device for controlling input / output power of a battery pack having a plurality of batteries connected in parallel,
An allowable power acquisition unit for acquiring the allowable power of each battery;
A power threshold setting unit that sets a minimum value of the allowable power of each battery as a threshold;
A power control unit for controlling the input / output power of the battery pack so that the input / output power of each battery is smaller than the threshold;
A control device comprising: A control method for controlling input / output power of a battery pack having a plurality of batteries connected in parallel,
Obtaining the allowable power of each battery,
Set a minimum value of the allowable power of each battery as a threshold,
The control method, wherein the input / output power of the battery pack is controlled so that the input / output power of each battery is smaller than the threshold value.

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