WO2017154115A1

WO2017154115A1 - Storage battery apparatus, storage battery system, method, and control program

Info

Publication number: WO2017154115A1
Application number: PCT/JP2016/057226
Authority: WO
Inventors: 坂田　康治; 麻美水谷; 智広豊崎
Original assignee: 株式会社東芝
Priority date: 2016-03-08
Filing date: 2016-03-08
Publication date: 2017-09-14
Also published as: JPWO2017154115A1

Abstract

The storage battery apparatus of an embodiment has a plurality of parallel-connected battery boards, each of which has a plurality of series-connected cell modules each equipped with battery cells. This storage battery apparatus is equipped with: breakers which each connect the storage batteries of the corresponding battery board to a main circuit; a voltage measurement unit which measures battery voltage; and a control unit which turns to the open position the breakers corresponding to the battery boards having a voltage difference therebetween exceeding a predetermined allowable voltage difference among the plurality of battery boards, and turns to closed position the breakers corresponding to the plurality of battery boards having a voltage difference therebetween equal to or smaller than the allowable voltage difference, and at the same time charges or discharges the storage batteries to a target battery voltage, the above process being repeated until the differences in voltage between all battery boards fall within the allowable voltage difference. Thus, it is possible to suppress the occurrence of excessive inrush current upon turning on the breakers, and quickly make a voltage adjustment for that purpose.

Description

Storage battery device, storage battery system, method and control program

Embodiments of the present invention relate to a storage battery device, a storage battery system, a method, and a control program.

In recent years, the introduction of safe and clean natural energy including solar power generation and wind power generation has been progressing. However, the output of natural energy is unstable, and there is a concern that the voltage and frequency in the power system will be adversely affected when mass introduction proceeds. In addition, if the supply amount of these natural energies greatly exceeds the power demand, the natural energy power generation system must be stopped, and the utilization rate of the power generation facilities is reduced.

Conventionally, stabilization of voltage and frequency in a power system has been addressed by governor-free control of a generator, an LFC (Load Frequency Control) function, load leveling by pumped-storage power generation, and the like. However, there were problems such as the problem of deficiency in generator lowering, the restriction of location conditions in the construction of the pumped storage power plant, and the long construction period.
Thus, attention is being paid to large-scale storage battery systems using secondary batteries with relatively few restrictions on location conditions.

JP 2014-127404 A JP 2014-075317 A JP 2014-119597 A JP 2014-023362 A JP 2014-041747 A JP 2014-110198 A Japanese Patent Laid-Open No. 2015-008040 JP 2013-137867 A

By the way, a secondary battery with a high energy density and a long life like a lithium ion battery has been developed and used not only as a vehicle-mounted secondary battery but also as a stationary storage battery for the purpose of stabilizing the power system. Is expanding. This stationary storage battery is configured by combining a large number of battery cells in a multi-series / multi-parallel manner in order to ensure a high voltage and a large capacity. In many cases, battery panels constituting the storage battery system are connected in parallel to the main circuit, and a circuit breaker is installed in each of the battery panels, and the circuit breaker open / close control is performed individually. In these parallel-connected battery panels, if a large voltage difference occurs between the battery panels, an excessive inrush current occurs immediately after turning on the circuit breaker, the fuse for overcurrent protection is blown, There is a risk of deteriorating the storage battery.

For this reason, it is necessary to turn on the circuit breakers of each battery panel while the voltage difference between the battery panels connected in parallel is as small as possible.

The present invention has been made in view of the above, and in a large-scale storage battery system composed of a plurality of battery panels connected in parallel, suppresses the occurrence of an excessive inrush current when a circuit breaker is turned on. An object of the present invention is to provide a storage battery device, a storage battery system, a method, and a control program capable of quickly adjusting the voltage for that purpose.

The storage battery device of the embodiment is a storage battery device in which a plurality of cell modules including battery cells and a plurality of battery panels connected in series are connected in parallel.
The circuit breaker connects the storage battery to the main circuit for each battery panel.
The voltage measuring unit measures the battery voltage.
Thus, the control unit opens the circuit breaker corresponding to the battery panel in which the voltage difference between the battery panels exceeds a predetermined allowable voltage difference among the plurality of battery panels, and the voltage difference between the battery panels is The circuit breakers corresponding to a plurality of battery panels that are within the allowable voltage difference are closed and charged or discharged simultaneously to achieve the target battery voltage until the voltage differences of all the battery panels are within the allowable voltage difference. repeat.

Drawing 1 is an outline lineblock diagram of a natural energy power generation system provided with the storage battery system of an embodiment. FIG. 2 is a schematic configuration block diagram of the storage battery system of the embodiment. FIG. 3 is an explanatory diagram of detailed configurations of the cell module, the CMU, and the BMU. FIG. 4 is an explanatory diagram when a voltage difference of the battery panel is generated. FIG. 5 is a process flowchart for adjusting the voltage difference between the battery panels. FIG. 6 is an explanatory diagram of a notification display example related to voltage adjustment. FIG. 7 is an explanatory diagram of an example of specific voltage adjustment. FIG. 8 is a diagram schematically illustrating the relationship between OCV and SOC in a lithium ion battery.

Next, embodiments will be described with reference to the drawings.
Drawing 1 is an outline lineblock diagram of a natural energy power generation system provided with the storage battery system of an embodiment.

The natural energy power generation system 100 functions as an electric power system, uses natural energy (renewable energy) such as sunlight, hydropower, wind power, biomass, geothermal heat, and the like, and a natural energy power generation unit 1 that can output as system power, A wattmeter 2 that measures the generated power of the energy power generation unit 1, and the surplus power of the natural energy power generation unit 1 is charged based on the measurement result of the wattmeter 2, and the generated power of the natural energy power generation unit 1 is discharged by discharging the insufficient power. A storage battery system 3 that is superimposed and output, a transformer 4 that performs voltage conversion of the output power of the natural energy power generation unit 1 (including the case where the output power of the storage battery system 3 is superimposed), and the locality of the storage battery system 3 The storage battery controller 5 that performs the control and remote control of the storage battery controller 5 It includes a host controller 6, a.

FIG. 2 is a schematic configuration block diagram of the storage battery system of the embodiment.
The storage battery system 3 can be broadly divided into a storage battery device 11 that stores electric power, and a power conversion device (PCS: Power) that converts DC power supplied from the storage battery device 11 into AC power having a desired power quality and supplies it to a load. Conditioning System) 12.

The storage battery device 11 roughly comprises a plurality of battery panel units 21-1 to 21-N (N is a natural number) and a battery terminal board 22 to which the battery panel units 21-1 to 21-N are connected. ing.
The battery panel units 21-1 to 21-N include a plurality of battery panels 23-1 to 23-M (M is a natural number) connected in parallel to each other, a gateway device 24, and a BMU (Battery Management Unit: battery described later). And a DC power supply device 25 that supplies a DC power supply for operation to a management device) and a CMU (Cell Monitoring Unit).

Here, the configuration of the battery panels 23-1 to 23-M will be described.
The battery panels 23-1 to 23-M are connected to the output power source via the high potential side power supply line (high potential side power supply line) LH and the low potential side power supply line (low potential side power supply line) LL, respectively. Lines (output power supply lines; bus lines) LHO and LLO are connected to supply power to the power converter 12 that is the main circuit.

Since the battery boards 23-1 to 23-M have the same configuration, the battery board 23-1 will be described as an example.
The battery panel 23-1 is roughly divided into a plurality (24 in FIG. 2) of cell modules 31-1 to 31-24 and a plurality of (see FIG. 1) provided in each of the cell modules 31-1 to 31-24. 24) CMU 32-1 to 32-24, a service disconnect 33 provided between the cell module 31-12 and the cell module 31-13, a current sensor 34, and a contactor 35. The cell modules 31-1 to 31-24, the service disconnect 33, the current sensor 34, and the contactor 35 are connected in series.

Here, in the cell modules 31-1 to 31-24, a plurality of battery cells are connected in series and parallel to form a battery pack. A plurality of cell modules 31-1 to 31-24 connected in series constitute an assembled battery group.

Further, the battery panel 23-1 includes a BMU 36, and the communication lines of the CMUs 32-1 to 32-24 and the output line of the current sensor 34 are connected to the BMU 36.
The BMU 36 controls the entire battery panel 23-1 under the control of the gateway device 24, and displays the communication results (voltage data and temperature data described later) and the detection results of the current sensor 34 with each CMU 32-1 to 32-24. Based on this, the contactor 35 is controlled to open and close.

Next, the configuration of the battery terminal board 22 will be described.
The battery terminal board 22 is configured as a microcomputer for controlling the plurality of panel breakers 41-1 to 41-N provided corresponding to the battery panel units 21-1 to 21-N and the entire storage battery device 11. A master device 42.

The master device 42 is configured as a control power line 51 to which power is supplied via the UPS (Uninterruptible Power System) 12A of the power conversion device 12 and the Ethernet (registered trademark) between the master device 42 and the power conversion device 12. A control communication line 52 for exchanging control data is connected.

Here, detailed configurations of the cell modules 31-1 to 31-24, the CMUs 32-1 to 32-24, and the BMU 36 will be described.

FIG. 3 is an explanatory diagram of detailed configurations of the cell module, the CMU, and the BMU.
Each of the cell modules 31-1 to 31-24 includes a plurality (10 in FIG. 3) of battery cells 61-1 to 61-10 connected in series.

CMUs 32-1 to 32-24 are voltage temperature measurement ICs (Analog Front End IC: AFE) for measuring the voltage of the battery cells constituting the corresponding cell modules 31-1 to 31-24 and the temperature of a predetermined location. -IC) 62, an MPU 63 that controls the entire CMU 32-1 to 32-24, and a communication controller 64 that conforms to the CAN (Controller Area Network) standard for performing CAN communication with the BMU 36, And a memory 65 for storing voltage data and temperature data corresponding to the voltage for each cell.

In the following description, the configuration in which each of the cell modules 31-1 to 31-24 and the corresponding CMUs 32-1 to 32-24 are combined will be referred to as battery modules 37-1 to 37-24. . For example, a configuration in which the cell module 31-1 and the corresponding CMU 32-1 are combined is referred to as a battery module 37-1.

The BMU 36 is transmitted from the MPU 71 that controls the entire BMU 36, the communication controller 72 conforming to the CAN standard for performing CAN communication between the CMUs 32-1 to 32-24, and the CMUs 32-1 to 32-24. And a memory 73 for storing voltage data and temperature data.

The storage battery controller 5 detects the generated power of the natural energy power generation unit 1 and suppresses output fluctuations of the generated power using the storage battery device 11 in order to reduce the influence of the generated power on the power system. Here, the fluctuation suppression amount for the storage battery device 11 is calculated by the storage battery controller 5 or its upper control device 6 and is given as a charge / discharge command to a PCS (Power Conditioning System) 12 corresponding to the storage battery device 11.

As described above, the plurality of panel breakers 41-1 to 41-N are provided corresponding to the battery panels 23-1 to 23-M.
These panel breakers 41-1 to 41-N are sequentially turned on (closed) when the storage battery system 3 is started. Thereby, a main circuit is connected and it is set as the state in which charging / discharging to a storage battery is possible.

At this time, if the amount of charge between the battery panels 23-1 to 23-M is different and there is a large difference in the voltage between the battery panels 23-1 to 23-M, immediately after turning on the circuit breaker, An excessive inrush current (cross current) occurs. Assuming that a voltage difference ΔV has occurred between two battery panels that can be connected in parallel, the inrush current I that flows when the circuit breaker is turned on can be obtained from the following equation (1).

Here, R is the internal resistance per battery panel (sum of internal resistance of storage battery, wiring, etc.). The storage battery system is provided with a fuse for protecting the overcurrent. When an overcurrent flows on the main circuit, the fuse may be blown unintentionally. Moreover, when an overcurrent flows through the storage battery, there is a concern that the storage battery may be deteriorated or that the storage battery is damaged.

Therefore, in order to prevent the occurrence of this inrush current, when a voltage difference of a certain level or more is generated between the battery panels connected in parallel, protection is performed so that the breaker of the corresponding battery panel is not turned on. Then, after the maintenance staff resolves the voltage difference between the battery panels, they try to turn on the circuit breaker again. As described above, in order to prevent an excessive current from being generated between the battery panels connected in parallel, it is necessary to reduce a voltage difference between the corresponding battery panels when the circuit breaker is turned on.

By the way, conventionally, when the voltage difference between the battery panels exceeds a predetermined threshold, the controller of the storage battery system does not turn on the circuit breakers of these battery panels, and the inrush current generated on the main circuit is obviated. It was preventing. In order to eliminate the voltage difference between the battery panels, it is necessary for the maintenance staff to confirm the voltage difference for each battery panel and to charge / discharge the storage battery for each battery panel to eliminate the voltage difference.
Therefore, in the present embodiment, when a voltage difference of a certain level or more is generated between the battery panels at the time of starting the storage battery system, charging and discharging are individually performed on the individual battery panels. Adjust the voltage difference. And after confirming that the voltage difference between all the battery panels is settled in the allowable range, the circuit breakers of all the battery panels are automatically turned on so that the entire storage battery system can be charged and discharged.

FIG. 4 is an explanatory diagram when a voltage difference of the battery panel is generated.
When a difference occurs in the charge amount between the battery panels connected in parallel due to the maintenance of the battery panel or the like, it is as shown in FIG.

By the way, in a general lithium ion battery, the battery voltage increases as the charge amount increases, and the battery voltage decreases as the charge amount decreases. Therefore, as shown in FIG. 4, when a difference occurs in the charge amount between the battery panels, a difference also occurs in the voltage between the battery panels.

Here, a method of adjusting the voltage difference between the battery panels will be described with reference to FIG.
As a selection method of the reference voltage used for voltage adjustment,
(A) a method of selecting the highest battery panel voltage as a reference voltage;
(B) a method of selecting the lowest battery panel voltage as a reference voltage;
(C) a method of selecting the average voltage of each battery panel as a reference voltage;
(D) when there are a plurality of battery panels having the same voltage (a plurality of battery panel groups), a method of selecting the average voltage of the battery panel group (combination) having the largest number as a reference voltage;
Etc.

In addition, as another reference voltage selection method, according to the operation policy of the storage battery system,
(E) a method in which an operator sets a target charging rate (SOC) and selects a battery voltage corresponding to the charging rate as a reference voltage;
Can also be considered.
The above-described reference voltage selection methods (a) to (e) each have advantages and disadvantages.
For example, when the reference voltage selection method (b) is adopted and adjusted to the lowest battery panel voltage, the amount of electrical energy that can be discharged by the storage battery decreases, so the reference voltage selection method (a) is adopted. There are cases where it is preferable to select the highest battery panel voltage as the reference voltage.

Further, when the reference voltage selection method (a) is adopted and the highest battery panel voltage is used as the reference voltage, the reference voltage selection method (b) is adopted and the lowest battery board voltage is used as the reference voltage, or When the reference voltage selection method of (c) is adopted and the average voltage is used as the reference voltage, the total voltage required for voltage adjustment is larger than when the reference voltage selection method of (d) is adopted and selected as the reference voltage. There are cases where the amount of charge and discharge increases and waste occurs.

Therefore, it is desirable to determine the reference voltage selection method according to the application and design policy of the storage battery system.

In the following, a specific processing procedure will be described by taking as an example the case where the above-described method for selecting the reference voltage (d) is adopted.
FIG. 5 is a process flowchart for adjusting the voltage difference between the battery panels.
When the voltage difference between the battery panels exceeds the allowable range, the processing procedure for adjusting the voltage difference between the battery panels is as follows.

First, the voltages of the battery panels 23-1 to 23-M (units) are measured (step S11).
Next, the voltage difference between the battery panels is calculated (step S12).

Then, a combination of battery panels having a voltage difference within an allowable range is obtained, and the average voltage of the battery panels having the largest number is selected as a reference voltage (step S13).
Here, the voltage difference is within the allowable range is a range in which the amount of current between the battery panels resulting from the voltage difference when connecting the battery panels is equal to or less than the allowable current value even if they are connected as they are. In this case, if there is no combination of battery panels having a voltage difference within an allowable range, the battery panel closest to the average voltage of all the battery panels is selected, and the voltage is selected as the reference voltage.

Subsequently, a voltage adjustment schedule is created (step S14).
When creating a schedule, a battery panel with the largest voltage difference from the set reference voltage is selected as a charge / discharge target to be scheduled preferentially among battery panels other than the combination of battery panels whose voltage difference is within an allowable range. (Step S14-1). At this time, if there are a plurality of battery panels whose SOC differences are within an allowable range with respect to the battery panel selected in step S14-1, they are selected together.

Then, a voltage adjustment schedule is created for these battery panels so that they are charged and discharged until the same voltage as that of the battery panel having the next largest voltage difference is reached (step S14-2).
Next, it is determined whether or not the voltage difference between all battery panels falls within the allowable range (step S14-3). If it is determined that the voltage difference between all battery panels does not fall within the allowable range (step S14-3) S14-3; No), the process of step S14-1 is repeated again to continue schedule creation.

Next, when all the charging / discharging target schedules are created, the time required for voltage adjustment is calculated according to the created schedule, and a display is made to notify the operator (step S15).

FIG. 6 is an explanatory diagram of a notification display example related to voltage adjustment.
Specifically, the storage battery system 3 calculates the required time T (h) required for adjusting the voltage between the battery panels, and as shown in FIG. 6, a guideline for the required time (48 minutes in the example of FIG. 6). ) Is displayed on the operation monitoring panel, or is notified to the host device or the like, so that the operator or the like can be notified in advance.

Subsequently, the voltage of the battery panel is adjusted according to the created schedule (step S16).
When the voltage difference between all the battery panels 23-1 to 23-M falls within the allowable range, all the panel breakers 41-1 to 41-M are turned on and closed (step S17).

Next, a specific example of voltage adjustment will be described with reference to the drawings.
FIG. 7 is an explanatory diagram of an example of specific voltage adjustment.
In the following description, for simplification of description, a case where there are five battery panels 23-1 to 21-5 (M = 5) will be described as an example.

In the case of the example of FIG. 7, the combination of the battery panels in which the voltage difference between the battery panels is within the allowable range is the battery panel 23-3 and the battery panel 23-4 as shown in FIG.
Therefore, the average voltage of the battery panel 23-3 and the battery panel 23-4 is selected as the reference voltage.

For battery panels (battery panel 23-1, battery panel 23-2, and battery panel 23-5) that have a voltage difference that exceeds the allowable voltage difference, a schedule is created so that charging and discharging are performed individually. The voltage difference is adjusted with the target reference voltage as a target.

In this case, the voltage difference between the voltage of each battery panel and the selected reference voltage is battery panel 23-2> battery panel 23-5, battery panel 23-1> battery panel 23-3 = battery panel 23-4. It shall be. Further, it is assumed that the voltage of the battery panel 23-3> the voltage of the battery panel 23-4.

First, in accordance with the created schedule, a breaker of a battery panel 23-2 other than the battery panel used for selecting the reference voltage and having the largest voltage difference with respect to the reference voltage is inserted, and FIG. As shown in B), the storage battery constituting the battery panel 23-2 is charged in order to adjust the voltage difference. In the process of charging up to the reference voltage, charging is first performed until the voltage is the same as that of the battery panel 23-5 having the smallest voltage difference with respect to the voltage of the battery panel 23-2. Thereafter, the circuit breaker of the battery panel 23-2 is opened.

Next, according to the schedule, the breaker of the battery panel 23-1 having the largest voltage difference (> 0) with respect to the reference voltage at this time is inserted, and as shown in FIG. 7 (C), the voltage difference The battery is discharged to adjust the battery.

In this case, there is no battery panel having a voltage between the battery panel 23-1 and the battery panel used for selecting the reference voltage and having a voltage closer to the battery panel 23-1. In the process of discharging the battery panel 23-1 to the reference voltage, there is no other battery panel that requires adjustment of the voltage difference, so a schedule is prepared to discharge to the selected reference voltage at a time. .

According to the schedule described above, at this time, the voltage of each battery panel is as follows.
Battery panel 23-3> Battery panel 23-1> Battery panel 23-4> Battery panel 23-2≈Battery panel 23-5

Therefore, finally, the battery panel 23-2 and the battery panel 23-5 are made into one group, and these circuit breakers are simultaneously turned on (closed) and charged to the reference voltage as shown in FIG. 7D. .
As a result, the voltages of the battery panels are as follows, and as shown in FIG. 7E, the voltages of all the battery panels are within the allowable range.
Battery panel 23-3> Battery panel 23-1≈Battery panel 23-2≈Battery panel 23-5> Battery panel 23-4

In this way, the voltage difference of each battery panel is measured, and multiple battery panels whose voltage differences are within the allowable range are collectively adjusted as a group, thereby performing charging / discharging for each battery panel individually. Compared with the method, the voltage difference can be adjusted in a short time.

Next, charge / discharge control of a storage battery required for performing voltage adjustment in creating a voltage adjustment schedule will be described.
Usually, the PCS 12 does not have a function capable of directly adjusting the voltage difference of the storage battery, and generally performs charge / discharge control of the storage battery based on the active power and the charge / discharge time. Therefore, in order to adjust the voltage difference between the battery panels, it is necessary to obtain the difference in charge from the voltage difference between the battery panels.

Then, based on the difference in charge amount, the PCS output (active power) and the charge / discharge time are determined. In general lithium ion batteries, there is often a correlation between the amount of charge (charging state: SOC) and the open circuit voltage (OCV). In such a storage battery, the charge amount difference can be estimated from the open circuit voltage difference.

FIG. 8 is a diagram schematically illustrating the relationship between OCV and SOC in a lithium ion battery.
In the following, OCV at SOC 0% is referred to as a lower limit voltage, and OCV at SOC 100% is referred to as an upper limit voltage.

In general, the higher the SOC, the higher the OCV of the storage battery. Based on the battery characteristics, the storage battery charge amount difference ΔSOC (%) can be determined from the battery panel OCV difference ΔV (V ₂ −V ₁ ).
The charge amount difference ΔSOC (%) can be converted by the following equation (2) by using the rated capacity Cap (Wh) of the storage battery.

Using this charge amount difference ΔSOC ′ (Wh) and the charge / discharge power P (W) at the time of voltage adjustment, the required time T (h) required for voltage adjustment between the battery panels is given by the following equation (3). Desired.

The storage battery system can adjust the voltage difference between the battery panels based on the charge / discharge power P (W) and the required time T (h).

As described above, according to the storage battery system including a plurality of storage battery devices to which the embodiment is applied, generation of an excessive inrush current at the time of turning on the circuit breaker is suppressed, and voltage adjustment therefor is quickly performed. It becomes possible.

Furthermore, the capacity of each storage battery device can be used effectively, the effective life of the storage battery system can be extended, the operation cost can be reduced, and the storage battery system can be operated for a long time.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

Claims

A plurality of cell modules provided with battery cells, a storage battery device in which a plurality of battery panels connected in series are connected in parallel,
A circuit breaker for connecting a storage battery to the main circuit for each battery panel;
A voltage measuring unit for measuring the battery voltage;
Among the plurality of battery panels, the circuit breaker corresponding to the battery panel whose voltage difference between the battery panels exceeds a predetermined allowable voltage difference is opened, and the voltage difference between the battery panels is within the allowable voltage difference. A control unit that repeats the process of setting the target battery voltage by simultaneously charging or discharging the circuit breaker corresponding to a plurality of battery panels until the voltage difference of all the battery panels is within the allowable voltage difference, and
A storage battery device comprising:
The control unit is configured to control the battery board to be charged or discharged when there is no other battery board having a voltage between the voltage of the battery board to be charged or discharged and the target battery voltage. Charge or discharge to the target battery voltage,
The storage battery device according to claim 1.
The control unit uses an average voltage of the plurality of battery panels as the target battery voltage when voltage values of the plurality of battery panels are included within a predetermined allowable voltage difference.
The storage battery device according to claim 1.
The control unit, as the target battery voltage, the highest battery panel voltage, the lowest battery panel voltage, the average voltage of the battery panel voltage, or when there are a plurality of battery panels that can already be regarded as equal battery voltage, the number is Use one of the average voltages in the most battery panel group,
The storage battery device according to claim 1.
As the battery cell, a battery cell having a correlation between the charge amount and the open circuit voltage is used,
The control unit performs charge / discharge control of the battery panel based on a charge amount-open circuit voltage characteristic of the battery cell.
The storage battery device according to claim 1.
When the voltage difference between all the battery panels is within the allowable voltage difference, the control unit closes all the circuit breakers.
The storage battery device according to claim 1.
When the voltage difference between the battery panels exceeds the allowable voltage difference, the control unit calculates and notifies in advance the time required to adjust the voltage difference between the battery panels.
The storage battery device according to claim 1.
A storage battery system comprising a plurality of cell modules including battery cells, a storage battery device in which a plurality of battery panels connected in series are connected in parallel, and a control device for controlling the storage battery device,
A circuit breaker for connecting a storage battery to the main circuit for each battery panel;
It has a voltage measurement unit that measures battery voltage,
The control device opens the circuit breaker corresponding to a battery panel in which a voltage difference between the battery panels exceeds a predetermined allowable voltage difference among the plurality of battery panels, and the voltage difference between the battery panels is The circuit breakers corresponding to a plurality of battery panels that are within the allowable voltage difference are closed and charged or discharged simultaneously to achieve the target battery voltage until the voltage differences of all the battery panels are within the allowable voltage difference. repeat,
Storage battery system.
A plurality of cell modules having battery cells, a plurality of battery panels connected in series are connected in parallel, a circuit breaker for connecting a storage battery to the main circuit for each battery panel, and a voltage measuring unit for measuring a battery voltage A method performed in a storage battery device having
The process of measuring battery voltage;
Among the plurality of battery panels, the circuit breaker corresponding to the battery panel whose voltage difference between the battery panels exceeds a predetermined allowable voltage difference is opened, and the voltage difference between the battery panels is within the allowable voltage difference. The process of repeating the process of simultaneously charging or discharging the circuit breaker corresponding to a plurality of battery panels to the target battery voltage by closing or charging until all the voltage differences of the battery panels are within the allowable voltage difference,
With a method.
A plurality of cell modules having battery cells, a plurality of battery panels connected in series are connected in parallel, a circuit breaker for connecting a storage battery to the main circuit for each battery panel, and a voltage measuring unit for measuring a battery voltage A control program for controlling a storage battery device having
The computer,
Means for measuring battery voltage;
Among the plurality of battery panels, the circuit breaker corresponding to the battery panel whose voltage difference between the battery panels exceeds a predetermined allowable voltage difference is opened, and the voltage difference between the battery panels is within the allowable voltage difference. Means for repeating the process of simultaneously charging or discharging the circuit breaker corresponding to a plurality of battery panels to a target battery voltage by being charged or discharged until the voltage difference of all the battery panels is within the allowable voltage difference;
Control program to function.