JP7325319B2 - Power control device and power control method - Google Patents

Description

The present disclosure relates to a power control device and a power control method.

2. Description of the Related Art Conventionally, a power storage system that stores power in a plurality of power storage devices is known. In such a power storage system, when a failure occurs in some of the plurality of power storage devices, all of the plurality of power storage devices are electrically disconnected until replacement of the failed power storage device is completed. . However, there is a demand to operate power storage devices that are not out of order in emergencies such as the occurrence of natural disasters or long-term power outages. The power storage system described in Patent Literature 1 can continue operation by opening only the opening/closing means of the assembled battery of the failed power storage device and using the other power storage devices.

JP 2015-006027 A

Here, there is a difference in the degree of failure of the power storage device, and even in an emergency, the operation of the power storage system with consideration for safety has been demanded.

An object of the present disclosure made in view of such points is to provide a power control device and a power control method that enable safe operation of a power storage system in an emergency.

A power control device according to an embodiment of the present disclosure includes: a communication unit that acquires an abnormality signal that notifies an abnormality from a failed device that has failed among a plurality of power storage devices; a continuous operation process of electrically disconnecting the plurality of power storage devices in the event of a failure, and operating at least a portion of the plurality of power storage devices excluding the faulty device when it is determined that the failure of the failed device is a minor failure and a controller for executing

A power control method according to an embodiment of the present disclosure acquires an anomaly signal that notifies an anomaly from a failed device among a plurality of power storage devices that has failed; electrically disconnecting the power storage device; and operating at least a portion of the plurality of power storage devices other than the faulty device when it is determined that the failure of the faulty device is a minor failure.

According to an embodiment of the present disclosure, a power control device and a power control method that enable safe operation of a power storage system in an emergency can be provided.

FIG. 1 is a diagram illustrating a configuration example of a power storage system including a power control device according to an embodiment of the present disclosure. FIG. 2 is a flow chart showing the power control method executed by the power control device. FIG. 3 is a diagram illustrating a configuration example of a power storage system including a power control device according to a modification.

(Configuration of power storage system)
FIG. 1 is a diagram illustrating a configuration example of a power storage system 1 including a power control device 10 according to an embodiment of the present disclosure. The power storage system 1 is connected to a power system 60 and supplies power to a load 70 connected to the power system 60 . The load 70 may include any electrical device that consumes power, such as lighting, air conditioners, or information processing equipment. The power storage system 1 stores power supplied from the power system 60 in the power storage device 20 .

The power storage system 1 includes a power control device 10 and a plurality of power storage devices 20 . In the example of FIG. 1 , the power storage system 1 includes three power storage devices 20 , but may include two power storage devices 20 or four or more power storage devices 20 . Power storage devices 20 are referred to as power storage devices 20A, 20B, or 20C when they are distinguished from each other. Power storage devices 20A, 20B and 20C are connected by electric wire 40 and arranged in parallel. Power storage device 20 is connected to power system 60 via power control device 10 .

In power storage system 1 , power control device 10 and power storage device 20 are communicably connected to each other via communication line 50 . In the present embodiment, each of power storage devices 20A, 20B, and 20C can communicate with power control device 10 without going through other power storage devices 20 . The communication line 50 may be configured, for example, as a bus type. The communication line 50 may be wired or wireless.

The power control device 10 is also called a PCS (Power Conditioning System). Also, the power control device 10 may be referred to as a power conditioner. The power control device 10 comprehensively controls the operation of the power storage system 1 to realize various functions. The power control device 10 controls power input/output between, for example, the power storage device 20 , the power system 60 and the load 70 . The power control device 10 converts, for example, DC power output from the power storage device 20 into AC power and outputs the AC power to the power system 60 or the load 70 . In addition, power control device 10 performs failure determination of power storage device 20, electrical disconnection of power storage device 20, and continuous operation processing, which will be described later. The details of the configuration of the power control device 10 will be described later.

Power storage device 20 stores power supplied from power system 60 . The power storage device 20 supplies the accumulated power to the load 70 . In addition, the power storage device 20 may supply power that can be sold to the power system 60 . When a failure occurs, power storage device 20 outputs an abnormality signal that notifies power control device 10 of the abnormality. The power storage device 20 may provide various types of information to the power control device 10 based on the control signal from the power control device 10 . The details of the configuration of power storage device 20 will be described later.

(Configuration of power control device)
The power control device 10 includes a communication section 11 , a notification section 12 , an input section 13 , a storage section 14 , a control section 15 and a switch 16 .

The communication unit 11 communicates with a plurality of power storage devices 20 . The communication unit 11 acquires an abnormality signal that notifies an abnormality from the failed power storage device 20 . Power storage device 20 that has failed is hereinafter referred to as a faulty device. The number of faulty devices is not limited to one, and may be multiple. The communication unit 11 acquires parameters used to determine the state of failure from the failed device. The parameter is, for example, the voltage value of the failed cell battery of the failed device. The communication unit 11 outputs information acquired from the power storage device 20 to the control unit 15 . The communication unit 11 may include, for example, a CAN (Controller Area Network) communication module, a wired LAN communication module, a wireless LAN (Local Area Network) communication module, or the like.

The notification unit 12 notifies the user of information by means of sound, vibration, lighting of lights, images, and the like. The notification unit 12 includes, for example, at least one of a speaker, vibrator, light, display device, and the like. The display device can be, for example, a liquid crystal display or an organic EL display. The notification unit 12 may be provided in, for example, a remote controller, a tablet terminal, a personal computer, or the like physically separated from the power control device 10 . The reporting unit 12 may report information about the remaining amount of power stored in the power storage device 20, for example. The reporting unit 12 may report, for example, the state of failure of the power storage device 20 . In this embodiment, the notification unit 12 is integrated with the input unit 13 to form a touch panel display. The notification unit 12 displays a selection screen for allowing the user to select whether or not to permit the execution of the continuation operation process, which will be described later.

The input unit 13 receives an input operation from the user. The input unit 13 may include physical keys such as a power button, for example. The input unit 13 may be provided in, for example, a remote controller, a tablet terminal, a personal computer, or the like physically separated from the power control device 10 . As described above, in the present embodiment, the input unit 13 is integrated with the notification unit 12 to form a touch panel display. When the input unit 13 receives an input operation from the user, the input unit 13 outputs the content of the input operation to the control unit 15 . For example, when receiving an input operation on the selection screen from the user, the input unit 13 outputs to the control unit 15 whether or not execution of a continuation operation process, which will be described later, is permitted.

The storage unit 14 stores programs and data. The storage unit 14 may temporarily store the processing result of the control unit 15 . The storage unit 14 may include any storage device such as a semiconductor storage device, an optical storage device, a magnetic storage device, or the like. A semiconductor storage device may include, for example, a semiconductor memory. The storage unit 14 may function, for example, as a main storage device or an auxiliary storage device. The storage unit 14 may be a volatile storage device or a non-volatile storage device. The storage unit 14 may include multiple types of storage devices. The storage unit 14 may include a combination of a portable storage medium such as a memory card and a storage medium reader. The programs stored in the storage unit 14 include those that cause the control unit 15 to function as the abnormality determination unit 151 and the opening/closing control unit 152 . The data stored in the storage unit 14 includes normal ranges of parameters of the faulty device.

The switch 16 opens and closes the power circuit between the power control device 10 and the wire 40 . When switch 16 and switch 26 of power storage device 20 are closed under the control of control unit 15, power storage device 20 is enabled to charge and discharge electric power. When switch 16 is opened, power storage device 20 is electrically disconnected from power control device 10 . Even if switch 26 of power storage device 20 cannot be opened due to a failure, power storage device 20 and power control device 10 can be electrically disconnected by opening switch 16 .

The control unit 15 is a processor such as a CPU (Central Processing Unit), for example. The control unit 15 may be an integrated circuit such as SoC (System-on-a-Chip) in which other components are integrated. The control unit 15 may be configured by combining a plurality of integrated circuits. The control unit 15 comprehensively controls the operation of the power storage system 1 to realize various functions. The control unit 15 refers to data stored in the storage unit 14 as necessary. The control unit 15 implements various functions by executing commands included in programs stored in the storage unit 14 . In this embodiment, the control unit 15 implements the functions of the abnormality determination unit 151 and the opening/closing control unit 152 by executing the instructions of the program read from the storage unit 14 .

The abnormality determination unit 151 determines whether the failure of the failed device is a minor failure. The abnormality determination unit 151, together with the opening/closing control unit 152, executes continuous operation processing, which will be described later. Further, in the continuous operation process, the abnormality determination unit 151 determines whether or not the parameters obtained from the failed device are within the normal range. Details of the operation of the abnormality determination unit 151 will be described later.

The switching control unit 152 controls switching of the switch 16 of the power control device 10 and the switches 26 of the plurality of power storage devices 20 . Switching control unit 152 can electrically disconnect a plurality of power storage devices 20 from power control device 10 by opening switch 16 and switch 26 . Switching control unit 152 can selectively electrically connect some of the plurality of power storage devices 20 to power control device 10 by closing switches 16 and some switches 26 . Details of the operation of the opening/closing control unit 152 will be described later.

(Configuration of power storage device)
The power storage device 20 includes a power storage control unit 21 , a power storage unit 22 , a switch 26 , a power storage communication unit 27 , and a power storage storage unit 28 .

The power storage unit 22 includes a cell battery of a secondary battery. The power storage unit 22 charges and discharges power under the control of the power storage control unit 21 . Power storage unit 22 may include a plurality of cell batteries. The cell battery may be managed by the power storage control unit 21 in units of modules in which a plurality of cell batteries are connected.

Switch 26 opens and closes the power circuit between power storage device 20 and electric wire 40 . In this embodiment, the switch 26 opens and closes the power circuit under the control of the control unit 15 of the power control device 10 . The switch 26 may open and close the power circuit under the control of the power storage controller 21 . At this time, control by the control unit 15 is given priority over the power storage control unit 21 . When switch 16 and switch 26 of power control device 10 are closed, power storage device 20 is allowed to charge and discharge power. When switch 26 is opened, power storage device 20 is electrically disconnected from power control device 10 .

The power storage communication unit 27 communicates with the power control device 10 and other power storage devices 20 under the control of the power storage control unit 21 . When a failure occurs in the power storage device 20 , the power storage communication unit 27 outputs an abnormality signal for notifying the abnormality to the communication unit 11 . Also, when the power storage device 20 is a faulty device, the power storage communication unit 27 outputs to the communication unit 11 parameters used to determine the state of failure. The power storage communication unit 27 may include, for example, a CAN (Controller Area Network) communication module, a wired LAN communication module, a wireless LAN (Local Area Network) communication module, or the like.

The power storage storage unit 28 stores programs and data. The power storage storage unit 28 may temporarily store the processing result of the power storage control unit 21 . The electric storage memory unit 28 may include any memory device such as a semiconductor memory device, an optical memory device, and a magnetic memory device. A semiconductor storage device may include, for example, a semiconductor memory. The power storage storage unit 28 may function, for example, as a main storage device or an auxiliary storage device. The power storage storage unit 28 may be a volatile storage device or a non-volatile storage device. The power storage storage unit 28 may include multiple types of storage devices. The power storage storage unit 28 may include a combination of a portable storage medium such as a memory card and a storage medium reader. The programs stored in the power storage storage unit 28 include programs that cause the power storage control unit 21 to function as the abnormality detection unit 211 .

The power storage control unit 21 is a processor such as a CPU (Central Processing Unit), for example. The power storage control unit 21 may be an integrated circuit such as SoC (System-on-a-Chip) in which other components are integrated. The power storage control unit 21 may be configured by combining a plurality of integrated circuits. The power storage control unit 21 comprehensively controls the operation of the power storage device 20 to realize various functions. In the present embodiment, the control unit 15 implements the function of the abnormality detection unit 211 by executing program instructions read from the power storage unit 28 .

Abnormality detection unit 211 detects abnormalities of power storage device 20 including abnormalities of power storage unit 22 , switch 26 and power storage communication unit 27 . The abnormality detection unit 211 measures, for example, the voltage and current of the cell battery of the power storage unit 22 to detect failure of the cell battery. Abnormality detection unit 211 detects a failure of power storage unit 22 by, for example, measuring the voltage and current of the cell battery of power storage unit 22 . The abnormality detection unit 211 detects a failure of the switch 26 by opening and closing the switch 26, for example. The abnormality detection unit 211 detects an abnormality of the power storage communication unit 27 by communicating with the power control device 10 or another power storage device 20, for example. The abnormality detection unit 211 detects a high temperature abnormality by acquiring temperature information from a temperature sensor provided in the power storage device 20, for example. When abnormality detection unit 211 detects an abnormality in power storage device 20 , abnormality detection unit 211 outputs an abnormality signal together with information indicating the content of the abnormality to power control device 10 via power storage communication unit 27 . The information indicating the content of the abnormality may be, for example, an error code commonly used by the power control device 10 and the power storage device 20 . The error code can be, for example, a combination of letters and numbers. As an example, the error code “E01” may indicate an abnormality in the power storage communication unit 27 . The error code may be stored in the storage unit 14 and the power storage storage unit 28 of the power control device 10 .

(Power control method)
The power control device 10 can operate the power storage system 1 as described below, even if part of the power storage device 20 fails, for example, in an emergency. FIG. 2 is a flow chart showing a power control method executed by the power control device 10. As shown in FIG. Here, the power control device 10 executes continuous operation processing for operating at least some of the power storage devices 20 other than the failed device. The continuous operation process corresponds to steps S6 to S8 in FIG.

The power control device 10 waits until the communication unit 11 acquires an abnormal signal from the failed device (No in step S1).

When the communication unit 11 acquires an abnormal signal (Yes in step S<b>1 ), the switching control unit 152 opens the switch 16 and all the switches 26 to switch all of the power storage devices 20 to the power control device 10 . is electrically disconnected from (step S2). In the example of FIG. 1 , when the failed device is power storage device 20B and communication unit 11 acquires an abnormal signal from power storage device 20B, all power storage devices 20A, 20B, and 20C are electrically separated into As another example, when communication unit 11 acquires an abnormal signal, not all power storage devices 20 need to be disconnected. In this case, only power storage device 20B, which is the faulty device, is electrically disconnected. Power storage devices 20</b>A and 20</b>C that are not out of order need not be disconnected from power control device 10 .

When the abnormality determination unit 151 determines that the failure of the failed device is not a minor failure (No in step S3), the power control device 10 ends the process in a state in which all the power storage devices 20 are disconnected. That is, the power control device 10 continues the state in which the plurality of power storage devices 20 are electrically disconnected. Here, a minor failure is a failure of the power storage device 20 that is considered to pose no danger even if the power storage system 1 continues to operate. For example, a minor failure that affects only the failed device and does not affect the safety of operation of the power storage system 1 is classified as a minor failure. Specifically, for example, a failure of power storage unit 22 detected due to the voltage or current of the cell battery deviating from the standard range is determined to be a minor failure. However, the abnormality determination unit 151 determines that the abnormality of the power storage communication unit 27, the abnormality of the switch 26, the abnormality of the high temperature, and the like are not minor failures. Here, the abnormality determination unit 151 may determine whether the failure of the failed device is a minor failure using the error code. Here, it may be determined whether or not a fault related to the voltage or current of the cell battery is a minor fault depending on how much the fault deviates from the standard range. For example, when the failure of the faulty device is a voltage abnormality, the abnormality determination unit 151 may determine that it is a minor failure if the deviation from the standard range is equal to or less than a threshold value (eg, 0.1 [V]). The abnormality determination unit 151 may determine that there is no minor failure if the deviation exceeds the threshold. Further, for example, when the fault of the faulty device is a current anomaly, the fault determination unit 151 determines that it is a minor fault if the deviation from the standard range is equal to or less than a threshold value (eg, 0.2 [A]). good. However, if the deviation exceeds the threshold, the abnormality determination unit 151 may determine that it is not a minor failure.

When the abnormality determination unit 151 determines that the failure of the failed device is a minor failure (Yes in step S3), the power control device 10 displays a selection screen to the user (step S4). The power control device 10 displays a selection screen for selecting whether or not to permit execution of the continuous operation process, for example, on the touch panel display. Then, the input unit 13 outputs a signal indicating that the user has given permission or a signal indicating that the user has not given permission to the control unit 15 according to the position touched by the user.

If there is no permission from the user (No in step S<b>5 ), the power control device 10 ends the process in a state in which all power storage devices 20 are disconnected.

When there is permission from the user (Yes in step S5), the power control device 10 operates at least some of the power storage devices 20 other than the faulty device (step S6). In this embodiment, the power control device 10 operates all the power storage devices 20 except for the faulty device. In the example of FIG. 1, when the failed device is power storage device 20B and its failure is determined to be a minor failure and the user gives permission, the operations of power storage devices 20A and 20C are restarted. At this time, switching control unit 152 closes switch 16 of power control device 10, switch 26 of power storage device 20A, and switch 26 of power storage device 20C. Switch 26 of power storage device 20B remains open.

The power control device 10 acquires parameters from the failed device (step S7). For example, the communication unit 11 periodically or at appropriate intervals acquires parameters measured by the abnormality detection unit 211 of the failed device. A periodic acquisition may be, for example, an acquisition every few seconds or every few minutes. Also, the appropriate interval may be, for example, such that if the difference from the previously acquired parameter is large, the acquisition timing is advanced, and if the difference is small, the acquisition timing is delayed. The parameter may be at least one of voltage and current of the cell battery at which the fault is detected.

When the power control device 10 determines that the parameters obtained from the failed device are within the normal range (Yes in step S8), the power control device 10 continues the operation of the power storage device 20 excluding the failed device. Here, the normal range of parameters is a numerical range for judging that the fault of the faulty device remains a minor fault. For example, if the parameter is the voltage of a failed cell battery, the normal range may be defined by the reference voltage of the cell battery and the allowed voltage fluctuations. For example, when the reference voltage is 3.6 [V] and the allowable voltage fluctuation is 0.1 [V], the normal range is 3.5 [V] or more and 3.7 [V] or less. may be defined as At this time, if the voltage Vc of the failed cell battery, which is the acquired parameter, satisfies 3.5 [V] ≤ Vc ≤ 3.7 [V], the abnormality determination unit 151 determines that the parameter is within the normal range. . Also, for example, if the parameter is the current of a failed cell battery, the normal range may be defined below an acceptable threshold current. For example, when the threshold current is 1 [A], the normal range may be defined as 1 [A] or less. At this time, if the current Ic of the failed cell battery, which is the acquired parameter, satisfies Ic≦1 [A], the abnormality determination unit 151 determines that the parameter is within the normal range.

When the power control device 10 determines that the parameter acquired from the faulty device is not within the normal range (No in step S8), the power control device 10 electrically disconnects all of the plurality of power storage devices 20 from the power control device 10 (step S9), the process ends. In step S9, the switching controller 152 opens the switches 16 and all switches 26, as in step S2. When the abnormality determination unit 151 determines that the parameter is not within the normal range and the failure of the failed device is no longer a minor failure, the power control device 10 immediately stops the operation of the power storage device 20 and performs electrical disconnection. do.

As described above, the power control device 10 according to the present embodiment electrically disconnects the plurality of power storage devices 20, and then executes the continuous operation process when it is determined that the failure is a minor failure. Therefore, power control device 10 enables safe operation of power storage system 1 in an emergency.

The power control device 10 according to the present embodiment can continue to monitor the parameters of the failed device even in the continuous operation process, and immediately stop the continuous operation process when the failure is no longer a minor failure. At this time, power control device 10 enables safer operation of power storage system 1 .

Although the embodiments have been described above based on the drawings and examples, it should be noted that a person skilled in the art can easily make various modifications and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included within the scope of this disclosure. For example, functions included in each member, each means, each step, etc. can be rearranged so as not to be logically inconsistent, and a plurality of means and/or steps, etc. can be combined into one or divided. Is possible.

For example, in the above embodiment, as shown in FIG. 1, the power control device 10 is described as one device. However, the power control device 10 of the present disclosure is not limited to one device, and may include multiple independent devices.

For example, in the above embodiments, the power control method is described as being executed by the power control device 10 . However, some steps of the power control method may be executed by power storage control unit 21 of power storage device 20 . For example, the acquisition of the parameters of the failed device (step S7) and the comparison with the normal range (step S8) may be performed by the abnormality detection section 211 of the failed device. Then, when the parameter is not within the normal range, the faulty device may output a new abnormal signal to the power control device 10 .

For example, in the above embodiment, each of power storage devices 20A, 20B, and 20C has been described as being capable of communicating with power control device 10 without going through other power storage devices 20 . However, the communication line 50 of the power storage system 1 may have a different configuration. FIG. 3 is a diagram showing a configuration example of a power storage system 1 including a power control device 10 according to a modification. In this modification, the communication unit 11 and the power storage communication unit 27 of the power storage system 1 are daisy-chained. Other configurations are the same as in FIG. In the example of FIG. 3, the power storage device 20A is positioned at the most upstream of the daisy chain connection. Power storage device 20C is located at the most downstream position in the daisy chain connection. Power storage device 20B is positioned between power storage device 20A and power storage device 20C. For example, a signal output from the power storage communication unit 27 of the power storage device 20C passes through the communication line 50C, the power storage communication unit 27 of the power storage device 20B, the communication line 50B, the power storage communication unit 27 of the power storage device 20A, and the communication line 50A. , reaches the communication unit 11 of the power control device 10 . If the faulty device is power storage device 20B, there is a risk that the signal from power storage device 20C will not be correctly transmitted to power storage device 20B. Therefore, the power control device 10 executes the continuous operation process not only for the failed device but also for the power storage device 20 located downstream of the failed device.

In this modification, the storage unit 14 stores the position of the power storage device 20 in the daisy chain connection, that is, the positional relationship information relative to upstream or downstream. When the communication unit 11 acquires an abnormal signal via at least a part of the plurality of power storage devices 20 connected in a daisy chain, the control unit 15 of the power control device 10 determines the location downstream of the failed device based on the positional relationship information. The located power storage device 20 is identified. Then, in the continuous operation process, control unit 15 operates power storage devices 20 located downstream of the failed device in the daisy chain connection and a plurality of power storage devices 20 excluding the failed device.

For example, in the above embodiment, the power control device 10 receives permission from the user and then executes the continuous operation process in steps S4 and S5 of FIG. Here, as a modification, steps S4 and S5 may be omitted. At this time, at least one of the notification unit 12 and the input unit 13 can be omitted or simplified.

The 17 international goals adopted at the United Nations Summit in September 2015 include "Sustainable Development Goals (SDGs)." The power control device 10 and the power control method according to one embodiment, among the 17 goals of the SDGs, for example, "7. Affordable and clean energy", "9. Build a foundation for industry and technological innovation" and "11. It can contribute to the achievement of goals such as 'building a city where people can continue to live.'

1 power storage system 10 power control device 11 communication unit 12 notification unit 13 input unit 14 storage unit 15 control unit 16 switches 20, 20A, 20B, 20C power storage device 21 power storage control unit 22 power storage unit 26 switch 27 power storage communication unit 28 power storage Storage unit 40 Electric wires 50, 50A, 50B, 50C Communication line 60 Power system 70 Load 151 Abnormality determination unit 152 Switching control unit 211 Abnormality detection unit

Claims (5)

a communication unit that acquires an anomaly signal that notifies an anomaly from a failed device that has failed among the plurality of power storage devices;
When the communication unit acquires the abnormal signal, the plurality of power storage devices are electrically disconnected, and when the failure of the failed device is determined to be a minor failure, the plurality of power storage devices excluding the failed device a control unit that executes a continuous operation process that operates at least part of the
The control unit electrically disconnects the plurality of power storage devices by immediately opening all of the switches of the plurality of power storage devices and the switches on the side of the control unit,
The power control device, wherein the minor failure is a failure of the plurality of power storage devices in which the voltage or current of the cell battery deviates from a standard range and the deviation from the standard range is equal to or less than a threshold. 2. The power control device according to claim 1, wherein when said control unit determines that the failure of said failed device is not a minor failure, said plurality of power storage devices are kept electrically disconnected. the communication unit acquires the abnormal signal via at least part of the plurality of power storage devices connected in a daisy chain;
3. The control unit according to claim 1, wherein in said continuous operation process, said power storage device located downstream of said failed device in a daisy chain connection and said plurality of power storage devices excluding said failed device are operated. power controller. An input unit that receives an input operation from a user,
The power control device according to any one of claims 1 to 3, wherein the control unit executes the continuous operation process after the input unit receives permission from the user. A power control method executed by a power control device including a control unit that controls electrical disconnection of a plurality of power storage devices,
Acquiring an anomaly signal that notifies an anomaly from a failed device that has failed among the plurality of power storage devices;
electrically disconnecting the plurality of power storage devices when the abnormality signal is acquired;
operating at least a portion of the plurality of power storage devices other than the faulty device when it is determined that the fault of the faulty device is a minor fault ;
electrically disconnecting the plurality of power storage devices is performed by immediately opening all of the switches of the plurality of power storage devices and the switch on the control unit side;
The power control method, wherein the minor failure is a failure of the plurality of power storage devices in which the voltage or current of the cell battery deviates from a standard range and the deviation from the standard range is equal to or less than a threshold.

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