JP2021009061A - Storage battery capacity detection method, program, and storage battery capacity detection system - Google Patents

Abstract

To accurately detect full charge capacity of a storage battery unit.SOLUTION: In a first acquisition step, when a power storage amount of a first storage battery module 111A is a lower limit, first residual capacity is acquired for each of a plurality of storage battery modules 111. In a charging step, charging is performed until a power storage amount of a second storage battery module 111B reaches an upper limit. In a first calculation step, based on an accumulated value of charging current in the charging step, a first amount of change is calculated for each of the plurality of storage battery modules 111. In a second acquisition step, when a power storage amount of the second storage battery module 111B is an upper limit, a second residual capacity is acquired for each of the plurality of storage battery modules 111. In a second calculation step, based on the first amount of change and a second amount of change, a full charge capacity is calculated for each of the plurality of storage battery modules 111.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a storage battery capacity detection method, a program, and a storage battery capacity detection system. More specifically, the present disclosure relates to a storage battery capacity detecting method, a program, and a storage battery capacity detecting system for detecting the full charge capacity of a storage battery unit including a plurality of storage battery modules connected in series with each other.

Patent Document 1 describes a battery capacity detection method (storage battery capacity detection method) capable of detecting a learning capacity (fully charged capacity of a storage battery unit) due to cycle deterioration. In the method for detecting the battery capacity described in Patent Document 1, when the deterioration counter, which is the degree of deterioration due to the cumulative amount of charge or discharge of the battery, reaches a predetermined threshold value, the capacity is measured by charge or discharge. Battery capacity can be measured.

Japanese Unexamined Patent Publication No. 2007-10370

In the battery capacity detection method described in Patent Document 1, for example, the full charge capacity of a storage battery unit including a plurality of secondary batteries (storage battery modules) connected in series could not be detected accurately.

An object of the present disclosure is to provide a storage battery capacity detection method, a program, and a storage battery capacity detection system capable of accurately detecting the full charge capacity of the storage battery unit.

The storage battery capacity detection method according to one aspect of the present disclosure is a storage battery capacity detection method for detecting the full charge capacity of a storage battery unit including a plurality of storage battery modules. The plurality of storage battery modules each have at least one cell battery and are connected in series with each other. In the storage battery capacity detection method, capacity measurement including a first acquisition step, a charging step, a first calculation step, a second acquisition step, and a second calculation step is executed. In the first acquisition step, when the storage amount of the first storage battery module is the lower limit value, the first remaining capacity is acquired for each of the plurality of storage battery modules based on the first open circuit voltage. The first storage battery module is at least one storage battery module among the plurality of storage battery modules. In the charging step, charging is performed until the stored amount of the second storage battery module reaches the upper limit value. The second storage battery module is at least one storage battery module among the plurality of storage battery modules. In the first calculation step, the first change amount is calculated for each of the plurality of storage battery modules based on the integrated value of the charging current in the charging step. The first change amount is a change amount of the integrated value. In the second acquisition step, when the storage amount of the second storage battery module is the upper limit value, the second remaining capacity is acquired for each of the plurality of storage battery modules based on the second open circuit voltage. In the second calculation step, the full charge capacity of each of the plurality of storage battery modules is calculated based on the first change amount and the second change amount. The second change amount is the difference between the first remaining capacity and the second remaining capacity.

The program according to one aspect of the present disclosure is a program for causing one or more processors to execute the storage battery capacity detection method.

The storage battery capacity detection system according to one aspect of the present disclosure is a storage battery capacity detection system that detects the full charge capacity of a storage battery unit including a plurality of storage battery modules. The plurality of storage battery modules each have at least one cell battery and are connected in series with each other. The storage battery capacity detection system includes a first acquisition unit, a charging unit, a first calculation unit, a second acquisition unit, and a second calculation unit. When the storage amount of the first storage battery module is the lower limit value, the first acquisition unit acquires the first remaining capacity for each of the plurality of storage battery modules based on the first open circuit voltage. The first storage battery module is at least one storage battery module among the plurality of storage battery modules. The charging unit charges the second storage battery module until the amount of electricity stored reaches the upper limit. The second storage battery module is at least one storage battery module among the plurality of storage battery modules. The first calculation unit calculates the first change amount for each of the plurality of storage battery modules based on the integrated value of the charging current by the charging unit. The first change amount is a change amount of the integrated value. The second acquisition unit acquires the second remaining capacity of each of the plurality of storage battery modules based on the second open circuit voltage when the storage amount of the second storage battery module is the upper limit value. The second calculation unit calculates the full charge capacity for each of the plurality of storage battery modules based on the first change amount and the second change amount. The second change amount is the difference between the first remaining capacity and the second remaining capacity.

According to the present disclosure, there is an effect that the full charge capacity of the storage battery unit can be detected with high accuracy.

FIG. 1 is a system diagram showing a configuration of a power storage system using the storage battery capacity detection system according to the embodiment. FIG. 2 is a block diagram showing the configuration of the storage battery capacity detection system of the above. FIG. 3 is a block diagram showing a configuration of a storage battery unit using the storage battery capacity detection system of the above. 4A and 4B are explanatory views for explaining charging and discharging of the storage battery unit using the storage battery capacity detection system of the same. FIG. 5 is an explanatory diagram for explaining the operation of the storage battery capacity detection system of the above. FIG. 6 is another explanatory diagram for explaining the operation of the storage battery capacity detection system of the same.

(Embodiment)
(1) Overview The storage battery capacity detection method according to the present embodiment is, for example, a method for detecting the full charge capacity of the storage battery unit 1 (see FIG. 1) included in the power storage system 10 (see FIG. 1). It is realized by the detection system 20 (see FIG. 2). The "full charge capacity" as used in the present disclosure refers to the storage capacity of a storage battery in a state where electrical energy is sufficiently stored in the storage battery (here, the storage battery unit 1 or each storage battery module 111).

As shown in FIG. 2, the storage battery capacity detection system 20 according to the present embodiment has a first acquisition unit 201, a second acquisition unit 202, a first calculation unit 203, a second calculation unit 204, and a charging unit 205. And.

The first acquisition unit 201 acquires the first remaining capacity for each of the plurality of storage battery modules 111 based on the first open circuit voltage V11 when the storage amount of the first storage battery module 111A is the lower limit value. The first storage battery module 111A is at least one storage battery module 111 among the plurality of storage battery modules 111. In the present embodiment, the first storage battery module 111A is one storage battery module 111. The lower limit is, for example, zero. That is, when the storage amount of the first storage battery module 111A is the lower limit value, no electric energy is stored in the first storage battery module 111A, and the first storage battery module 111A is in a completely discharged state. In other words, the first storage battery module 111A is a storage battery module 111 that is in the fastest fully discharged state among the plurality of storage battery modules 111. The "open circuit voltage" as used in the present disclosure refers to the voltage between the positive and negative poles of the storage battery when nothing is connected to the storage battery (here, the storage battery module 111). Further, the "remaining capacity" referred to in the present disclosure means the remaining ratio excluding the discharged electric energy from the state where the storage battery is fully charged (fully charged), and is expressed by the charge rate (SOC: State Of Charge). Can be done. The charge rate is represented by (remaining capacity / full charge capacity) × 100.

The charging unit 205 charges the second storage battery module 111B until the amount of electricity stored reaches the upper limit. The second storage battery module 111B is at least one storage battery module 111 among the plurality of storage battery modules 111. In the present embodiment, the second storage battery module 111B is one storage battery module 111. The upper limit is, for example, the full charge capacity of the second storage battery module 111B. That is, when the storage amount of the second storage battery module 111B is the upper limit value, the second storage battery module 111B is in a state where sufficient electric energy is stored. In other words, the second storage battery module 111B is the storage battery module 111 that reaches the fully charged state earliest among the plurality of storage battery modules 111. Further, in the present embodiment, the first storage battery module 111A and the second storage battery module 111B are the same storage battery module 111, but the first storage battery module 111A and the second storage battery module 111B are separate storage battery modules 111. May be good.

The first calculation unit 203 calculates the first change amount (ΔAh), which is the change amount of the integrated value, for each of the plurality of storage battery modules 111, based on the integrated value (Ah) of the charging current by the charging unit 205. In the present embodiment, a plurality of storage battery modules 111 are connected in series, and the first change amount of each storage battery module 111 is the same.

The second acquisition unit 202 acquires the second remaining capacity of each of the plurality of storage battery modules 111 based on the second open circuit voltage V12 when the storage amount of the second storage battery module 111B is the upper limit value.

Then, the second calculation unit 204 calculates the full charge capacity for each of the plurality of storage battery modules 111 based on the first change amount and the second change amount which is the difference between the first remaining capacity and the second remaining capacity. To do.

The storage battery capacity detection method according to the present embodiment is a method for detecting the full charge capacity of the storage battery unit 1 included in the power storage system 10. In this storage battery capacity detection method, capacity measurement including a first acquisition step, a charging step, a first calculation step, a second acquisition step, and a second calculation step is performed.

In the first acquisition step, when the storage amount of the first storage battery module 111A is the lower limit value, the first remaining capacity is acquired for each of the plurality of storage battery modules 111 based on the first open circuit voltage V11.

In the charging step, charging is performed until the stored amount of the second storage battery module 111B reaches the upper limit value.

In the first calculation step, the first change amount (ΔAh) is calculated for each of the plurality of storage battery modules 111 based on the integrated value (Ah) of the charging current in the charging step.

In the second acquisition step, when the storage amount of the second storage battery module 111B is the upper limit value, the second remaining capacity is acquired for each of the plurality of storage battery modules 111 based on the second open circuit voltage V12.

In the second calculation step, the full charge capacity of each of the plurality of storage battery modules 111 is calculated based on the first change amount and the second change amount.

In the storage battery capacity detection method, the first change amount calculated in the first calculation step and the second change which is the difference between the first remaining capacity acquired in the first acquisition step and the second remaining capacity acquired in the second acquisition step. The full charge capacity of each storage battery module 111 is calculated based on the amount. Therefore, by using the full charge capacity of each storage battery module 111 calculated in the second calculation step, the full charge capacity of the storage battery unit 1 can be detected with high accuracy.

(2) Configuration (2.1) Power Storage System First, the configuration of the power storage system 10 in which the storage battery capacity detection system 20 according to the present embodiment is used will be described with reference to FIGS. 1 and 3.

As shown in FIG. 1, the power storage system 10 according to the present embodiment is a storage-storing cooperation type power storage system including a storage battery unit 1, a power conversion unit 2, a remote controller 3, and a solar cell module 4. The power storage system 10 may include at least a storage battery unit 1 and a power conversion unit 2, and the remote controller 3 and the solar cell module 4 may be omitted. Further, in FIG. 1, the storage battery unit 1 included in the power storage system 10 is one, but may be plural.

(2.1.1) Storage Battery Unit As shown in FIG. 3, the storage battery unit 1 is controlled by a plurality of (two in FIG. 3) storage battery blocks 11 and a plurality of (two in FIG. 3) analog circuits 12. It has a circuit 13. Further, the storage battery unit 1 further includes an interface IC 14, a real-time clock (RTC) 15, a display 16, a switch 17, an OR circuit 18, and a current detection circuit 19. Further, the storage battery unit 1 further includes two first power supply terminals T11 and T12 and one first signal terminal T13. Here, in FIG. 3, there are two storage battery blocks 11, but there may be one storage battery block 11 or three or more storage battery blocks 11. That is, the storage battery unit 1 may have at least one storage battery block 11 according to its rated capacity. The plurality of storage battery blocks 11 are connected in parallel and electrically to the power conversion unit 2. The storage battery unit 1 may be replaced by one storage battery unit, 11 units of the storage battery block, or 111 units of the storage battery module.

(2.1.1.1) Storage Battery Block Each of the plurality of storage battery blocks 11 has a plurality of storage battery modules 111. The storage battery unit 1 may have a plurality of storage battery modules 111, and each of the plurality of storage battery blocks 11 may have at least one storage battery module 111. In each of the plurality of storage battery blocks 11, a plurality of storage battery modules 111 are connected in series and electrically.

Each of the plurality of storage battery modules 111 has a plurality of cell cells (cells) 1111. It is sufficient that each of the plurality of storage battery modules 111 has at least one cell battery 1111. Therefore, at least one storage battery module 111 among the plurality of storage battery modules 111 may have one cell battery 1111. In each of the plurality of storage battery modules 111, a plurality of cell cells 1111 are connected in parallel and electrically.

Each of the plurality of cell cells 1111 is, for example, a lithium ion battery. In each storage battery module 111, the positive poles of the plurality of single batteries 1111 are electrically connected to each other, and the negative poles of each other are electrically connected to each other. Each of the plurality of cell cells 1111 is not limited to a lithium ion battery, and is, for example, a lead storage battery, a nickel / cadmium storage battery, a nickel / hydrogen storage battery, a sodium / sulfur battery (NAS battery (registered trademark)), or the like. May be good.

(2.1.1.2) Analog Circuit Each of the plurality of analog circuits 12 is, for example, an analog front end (AFE). Each of the plurality of analog circuits 12 is composed of, for example, a semiconductor chip such as an amplifier, a filter, and an AD converter. The plurality of analog circuits 12 have a one-to-one correspondence with the plurality of storage battery blocks 11.

Each of the plurality of analog circuits 12 acquires the voltage V1 across the plurality of storage battery modules 111 included in the storage battery block 11 from the corresponding storage battery block 11 among the plurality of storage battery blocks 11. Further, each of the plurality of analog circuits 12 acquires the temperature information of the corresponding storage battery block 11 among the plurality of storage battery blocks 11. Further, each of the plurality of analog circuits 12 has a function of detecting overcharging and overdischarging of the corresponding storage battery blocks 11 among the plurality of storage battery blocks 11 and protecting each storage battery block 11.

In the present embodiment, each of the plurality of analog circuits 12 acquires the first open circuit voltage V11 and the second open circuit voltage V12 of each storage battery module 111 as the voltage V1 across the storage battery modules 111. The first open circuit voltage V11 is the voltage across each storage battery module 111 when the first storage battery module 111A is in a completely discharged state. The second open circuit voltage V12 is the voltage across each storage battery module 111 when the second storage battery module 111B is in a fully charged state. Further, in the present embodiment, the first storage battery module 111A and the second storage battery module 111B are the same storage battery module 111, and for example, the storage battery module 111 located at the uppermost part of each storage battery block 11 in FIG. ..

(2.1.1.3) Control circuit As shown in FIG. 2, the control circuit 13 includes a first acquisition unit 201, a second acquisition unit 202, a first calculation unit 203, and a storage battery capacity detection system 20. It functions as the second calculation unit 204. That is, the control circuit 13 has a first acquisition unit 201, a second acquisition unit 202, a first calculation unit 203, and a second calculation unit 204. The first acquisition unit 201, the second acquisition unit 202, the first calculation unit 203, and the second calculation unit 204 will be described in the column of "(2.2) Storage battery capacity system".

As shown in FIG. 3, the control circuit 13 is electrically connected to a plurality of analog circuits 12 via the interface IC 14. The control circuit 13 acquires the voltage across the storage battery modules 111 (first open circuit voltage V11 and second open circuit voltage V12) and the temperature information of each storage battery module 111 from each of the plurality of analog circuits 12. Further, the control circuit 13 is also electrically connected to the real-time clock 15, and acquires date and time information from the real-time clock 15.

The control circuit 13 further includes a storage unit 131. The storage unit 131 is, for example, a non-volatile flash memory. The storage unit 131 stores, for example, the scheduled implementation date for carrying out the capacity measurement described later, the degree of deterioration of each storage battery module 111 (for example, SOH (State Of Health)), and the like.

The control circuit 13 is composed of, for example, a microcomputer having a processor and a memory. That is, the control circuit 13 is realized in a computer system having a processor and a memory. Then, when the processor executes an appropriate program, the computer system functions as a control circuit 13 (including the first acquisition unit 201, the second acquisition unit 202, the first calculation unit 203, and the second calculation unit 204). .. The program may be pre-recorded in a memory, may be recorded through a telecommunication line such as the Internet, or may be recorded and provided on a non-temporary recording medium such as a memory card.

(2.1.1.4) Display The display 16 has, for example, an LED (Light Emitting Diode). The display 16 is electrically connected to the control circuit 13 and turns on or off the LED according to the control signal from the control circuit 13.

(2.1.1.5) Switch The switch 17 is electrically connected between the plurality of storage battery blocks 11 and the power conversion unit 2. The switch 17 is configured to open and close the electric circuit between the plurality of storage battery blocks 11 and the power conversion unit 2.

The switch 17 detects the life of any of the storage battery modules 111 during charging or discharging, or detects an abnormality in any of the storage battery modules 111, for example, when the control circuit 13 or the analog circuit 12 is detected. The above electric circuit is cut off according to the instruction from.

(2.1.1.6) Current detection circuit The current detection circuit 19 is, for example, a shunt resistor. The current detection circuit 19 detects the current (charge current or discharge current) flowing through each of the plurality of storage battery blocks 11 and outputs the detection result to the analog circuit 12. The analog circuit 12 outputs the detection result of the current detection circuit 19 to the control circuit 13.

(2.1.2) Power Conversion Unit The power conversion unit (power station) 2 has two second power supply terminals T21 and T22 and one second signal terminal T23, as shown in FIG. The first power supply terminal T11 and the second power supply terminal T21 are connected by a power line L1, the first power supply terminal T12 and the second power supply terminal T22 are connected by a power line L2, and the first signal terminal T13 and the second signal terminal T23 Is connected by the signal line L3. Therefore, the storage battery unit 1 can be retrofitted and replaced.

The power conversion unit 2 has, for example, a function of connecting the storage battery unit 1 and the solar cell module 4 to the AC system AC. Further, the power conversion unit 2 further has a first conversion function, a second conversion function, a third conversion function, and a fourth conversion function. The first conversion function is a function of converting the DC power generated by the solar cell module 4 into AC power for supplying the AC system AC or the AC load 7 connected to the AC system AC. The second conversion function is a function of converting the DC power generated by the solar cell module 4 into DC power for supplying to the storage battery unit 1. The third conversion function is a function of converting the DC power generated by the discharge of the storage battery unit 1 into AC power for supplying the AC system AC or the AC load 7 connected to the AC system AC. The fourth conversion function is a function of converting AC power from the AC system AC into DC power for supplying to the storage battery unit 1. The AC system AC is, for example, a commercial power system.

(2.1.3) Remote controller As shown in FIG. 1, the remote controller 3 is configured to be able to communicate with the server 5 via the router 6 and the network NT. The network NT is, for example, the Internet. Further, the remote controller 3 is configured to be able to communicate with each of the storage battery unit 1 and the power conversion unit 2. The remote controller 3 communicates with each of the storage battery unit 1 and the power conversion unit 2 in accordance with, for example, ECHONET Lite (registered trademark).

Further, the remote controller 3 has an operation unit and a display unit. The operation unit includes a plurality of operation buttons. The operation unit accepts the user's operation by pressing at least one of the plurality of operation buttons. The display unit is, for example, a liquid crystal display. The display unit displays, for example, the charging state of the storage battery unit 1 or the discharging state from the storage battery unit 1. Further, the display unit may display information such as the scheduled date of capacity measurement and the SOH of each storage battery module 111 in response to the user's operation on the operation unit.

(2.1.4) Solar cell module The solar cell module 4 has a plurality of solar cell cells. Each of the plurality of solar cells absorbs light energy from the sun and converts it into electrical energy (DC power). The solar cell module 4 outputs the electric energy converted by the plurality of solar cell cells to the power conversion unit 2.

(2.2) Storage Battery Capacity Detection System Next, the configuration of the storage battery capacity detection system 20 according to the present embodiment will be described with reference to FIG. As shown in FIG. 2, the storage battery capacity detection system 20 according to the present embodiment has a first acquisition unit 201, a second acquisition unit 202, a first calculation unit 203, a second calculation unit 204, and a charging unit 205. And. In the present embodiment, the control circuit 13 of the storage battery unit 1 functions as the first acquisition unit 201, the second acquisition unit 202, the first calculation unit 203, and the second calculation unit 204.

Here, charging and discharging of the storage battery unit 1 will be described with reference to FIGS. 4A and 4B. Here, a case where three storage battery modules 111C, 111D, and 111E are connected in series will be illustrated.

FIG. 4A shows a case where there is a difference in the remaining capacities of the three storage battery modules 111C, 111D, and 111E. In FIG. 4A, the remaining capacity of the storage battery module 111D is the largest, and the remaining capacity of the storage battery module 111C is the smallest. When the three storage battery modules 111C, 111D, 111E are discharged from this state, the storage battery module 111C having the smallest remaining capacity is in a completely discharged state, and the storage battery modules 111D, 111E have electric energy remaining. Further, when the three storage battery modules 111C, 111D, 111E are charged from this state, the storage battery module 111D having the largest remaining capacity is fully charged, and the remaining storage battery modules 111C, 111E are not fully charged.

FIG. 4B shows a case where there is a difference in the degree of deterioration of the three storage battery modules 111C, 111D, 111E. In FIG. 4B, the degree of deterioration of the storage battery module 111D is the largest, and the degree of deterioration of the storage battery module 111C is the smallest. Therefore, in this case, the remaining capacity of the storage battery module 111C having the smallest degree of deterioration is the largest, and the remaining capacity of the storage battery module 111D having the largest degree of deterioration is the smallest. When the three storage battery modules 111C, 111D, 111E are discharged from this state, the storage battery module 111D having the highest degree of deterioration is in a completely discharged state, and the remaining storage battery modules 111C, 111E have electric energy remaining. Further, when the three storage battery modules 111C, 111D, 111E are charged from this state, the storage battery module 111D having the highest degree of deterioration is fully charged, and the remaining storage battery modules 111C, 111E are not fully charged.

In the storage battery capacity detection system 20 according to the present embodiment, as described above, the full charge capacity of each storage battery module 111 can be calculated even when there is a difference in the remaining capacity and a difference in the degree of deterioration. It has the following configuration.

(2.2.1) First Acquisition Unit The first acquisition unit 201 is based on the first open circuit voltage V11 for each of the plurality of storage battery modules 111 when the storage amount of the first storage battery module 111A is the lower limit value. Acquire the first remaining capacity. In the present embodiment, the lower limit of the amount of electricity stored in the first storage battery module 111A is zero, and the first charge rate corresponding to the first remaining capacity of the first storage battery module 111A is 0%. That is, the first storage battery module 111A is in a completely discharged state. The first storage battery module 111A is the storage battery module 111 that is in the earliest fully discharged state among the plurality of storage battery modules 111. At this time, the first acquisition unit 201 acquires the first remaining capacity of each storage battery module 111 from the first open circuit voltage V11 of each storage battery module 111. Here, the first acquisition unit 201 determines whether or not the amount of electricity stored in the first storage battery module 111A is the lower limit value based on the magnitude of the voltage V1 across the first storage battery module 111A.

(2.2.2) Second Acquisition Unit The second acquisition unit 202 is based on the second open circuit voltage V12 for each of the plurality of storage battery modules 111 when the storage capacity of the second storage battery module 111B is the upper limit value. Acquire the second remaining capacity. In the present embodiment, the first storage battery module 111A and the second storage battery module 111B are the same storage battery module, and the second acquisition unit 202 is a plurality of storage battery modules when the storage amount of the first storage battery module 111A is the upper limit value. The second remaining capacity of each of 111 is acquired. Here, the upper limit of the storage amount of the first storage battery module 111A is the full charge capacity of the first storage battery module 111A, and the second charge rate corresponding to the second remaining capacity of the first storage battery module 111A is 100%. .. The first storage battery module 111A (second storage battery module 111B) is the storage battery module 111 that is in the earliest fully charged state among the plurality of storage battery modules 111. At this time, the second acquisition unit 202 acquires the second remaining capacity of each storage battery module 111 from the second open circuit voltage V12 of each storage battery module 111. Here, the second acquisition unit 202 determines whether or not the amount of electricity stored in the first storage battery module 111A is the upper limit value based on the magnitude of the voltage V1 across the first storage battery module 111A.

(2.2.3) First Calculation Unit The first calculation unit 203 is the amount of change in the integrated value for each of the plurality of storage battery modules 111 based on the integrated value (Ah) of the charging current by the charging unit 205. The first change amount (ΔAh) is calculated. In the present embodiment, a plurality of storage battery modules 111 are connected in series, and the charging current flowing through each storage battery module 111 is the same. Therefore, the first calculation unit 203 calculates the same value as the first change amount of each storage battery module 111.

(2.2.4) Second Calculation Unit The second calculation unit 204 sets a full charge capacity (FCC) for each of the plurality of storage battery modules 111 based on the first change amount and the second change amount. calculate. The second change amount is the difference between the first remaining capacity and the second remaining capacity. Here, when the first change amount is ΔAh, the first charge rate corresponding to the first remaining capacity is RSOC1, and the second charge rate corresponding to the second remaining capacity is RSOC2, the full charge capacity FCC is ( It is calculated by the formula 1).

As an example, for a storage battery module 111, when the first change amount ΔAh is 100 Ah, the first charge rate RSOC1 is 30%, and the second charge rate RSOC2 is 80%, the full charge capacity FCC is 200 Ah.

The second calculation unit 204 calculates the full charge capacity FCC of each storage battery module 111 based on the equation (1).

Further, the second calculation unit 204 calculates the degree of deterioration of each storage battery module 111 by comparing the full charge capacity FCC obtained from the equation (1) with the rated capacity (initial full charge capacity). The second calculation unit 204 calculates SOH as the degree of deterioration of each storage battery module 111. Here, when the initial full charge capacity is FCC0, the SOH can be obtained by the equation (2).

As an example, for a certain storage battery module 111, when the initial full charge capacity FCC0 is 250 Ah and the full charge capacity FCC obtained from the equation (1) is 200 Ah, the SOH is 80%.

Here, in the storage battery capacity detection system 20 according to the present embodiment, the minimum full charge capacity among the plurality of full charge capacities of the plurality of storage battery modules 111 is set as the full charge capacity of the storage battery unit 1. Then, the second calculation unit 204 determines that the life of the storage battery unit 1 is reached when the SOH with respect to the minimum full charge capacity falls below a predetermined threshold value (for example, 60%). That is, in the storage battery capacity determination method according to the present embodiment, the ratio of the fully charged capacity of the storage battery unit 1 to the rated capacity of the storage battery unit 1 is defined as the degree of deterioration of the storage battery unit 1, and when this degree of deterioration falls below a predetermined threshold value. Further includes a determination step of determining the life of the storage battery unit 1. In this case, the rated capacity (initial full charge capacity) of the storage battery module 111, which has the minimum full charge capacity, is the rated capacity of the storage battery unit 1.

(2.2.5) Charging unit The charging unit 205 is configured to charge a plurality of storage battery blocks 11. The charging unit 205 includes a charging circuit provided in the power conversion unit 2 and a switch 17 provided in the storage battery unit 1. Therefore, even when the plurality of storage battery blocks 11 are being charged by the charging circuit, the plurality of storage battery blocks 11 are blocked by blocking the electric path between the storage battery unit 1 and the power conversion unit 2 by the switch 17. You can stop charging to.

(3) Operation Next, the operation of the storage battery capacity detection system 20 according to the present embodiment will be described with reference to FIGS. 5 and 6. In the present embodiment, since the storage battery capacity detection system 20 is configured by the storage battery unit 1 and the power conversion unit 2, the operation of the storage battery unit 1 and the power conversion unit 2 will be described below.

The storage battery unit 1 and the power conversion unit 2 are in a state of waiting for a capacity measurement start instruction (S11 in FIG. 6) in a normal operation (S1 in FIG. 6) for charging or discharging a plurality of storage battery modules 111. When the capacity measurement start condition is satisfied (ST1 in FIG. 5), the storage battery unit 1 transmits a capacity measurement request flag requesting the execution of the capacity measurement to the power conversion unit 2. Here, the start condition of the capacity measurement is, for example, that a certain period (for example, one year) or more has passed since the previous capacity measurement was performed. That is, here, the capacity is measured according to the state of the storage battery unit 1.

When the power conversion unit 2 receives the capacity measurement request flag from the storage battery unit 1 (ST2 in FIG. 5), the power conversion unit 2 transmits a capacity measurement status flag indicating that the capacity measurement is being performed to the storage battery unit 1. Upon receiving this capacity measurement status flag, the storage battery unit 1 recognizes that capacity measurement is being performed (ST3 in FIG. 5). The storage battery unit 1 and the power conversion unit 2 shift from the normal operation to the capacity measurement operation (S2 in FIG. 6).

The storage battery unit 1 transmits a capacity measurement charge permission flag indicating charge prohibition and a capacity measurement discharge permission flag indicating discharge permission to the power conversion unit 2. The power conversion unit 2 starts discharging the plurality of storage battery modules 111 according to these flags (ST4 in FIG. 5 and S21 in FIG. 6). When the storage battery unit 1 detects that the first storage battery module 111A among the plurality of storage battery modules 111 is in a completely discharged state (ST5 in FIG. 5), the power conversion unit 2 sets a discharge permission flag for capacity measurement indicating discharge prohibition. Send to. The power conversion unit 2 stops discharging the plurality of storage battery modules 111 by receiving the discharge permission flag for capacity measurement (ST6 in FIG. 5). The storage battery unit 1 and the power conversion unit 2 wait for a certain period of time (for example, 20 to 30 minutes) until the voltage V1 across the first storage battery module 111A in the completely discharged state becomes stable among the plurality of storage battery modules 111 (FIG. 6). S22).

After a lapse of a certain period of time, the storage battery unit 1 acquires the first remaining capacity of each of the plurality of storage battery modules 111 based on the first open circuit voltage V11 (ST7 in FIG. 5). After that, the storage battery unit 1 transmits a capacity measurement charge permission flag indicating charge permission and a capacity measurement discharge permission flag indicating discharge prohibition to the power conversion unit 2. The power conversion unit 2 starts charging the plurality of storage battery modules 111 according to these flags (ST8 in FIG. 5 and S23 in FIG. 6). When the storage battery unit 1 detects that the first storage battery module 111A among the plurality of storage battery modules 111 is in a fully charged state (ST9 in FIG. 5), the power conversion unit 2 sets a charge permission flag for capacity measurement indicating charge prohibition. Send to. The power conversion unit 2 stops charging the plurality of storage battery modules 111 by receiving the charge permission flag for capacity measurement (ST10 in FIG. 5). The storage battery unit 1 and the power conversion unit 2 wait for a certain period of time (for example, 20 to 30 minutes) until the voltage V1 across the first storage battery module 111A in the fully charged state becomes stable among the plurality of storage battery modules 111 (FIG. 6). S24).

After a certain period of time has elapsed, the storage battery unit 1 acquires a second remaining capacity for each of the plurality of storage battery modules 111 based on the second open circuit voltage V12 (ST11 in FIG. 5). Further, the storage battery unit 1 sets the first change amount ΔAh, which is the change amount of the integrated value of the charging current from the start of charging the plurality of storage battery modules 111 to the acquisition of the second remaining capacity of each storage battery module 111. Calculate (ST12 in FIG. 5).

The storage battery unit 1 calculates a second change amount which is a difference between the first remaining capacity (first charge rate) acquired in ST7 and the second remaining capacity (second charge rate) acquired in ST11. At this time, the storage battery unit 1 and the power conversion unit 2 are in a state of waiting for the update of the full charge capacity of each storage battery module 111 (S25 in FIG. 6). The storage battery unit 1 calculates the full charge capacity FCC for each storage battery module 111 based on the first change amount and the second change amount calculated in ST12, and updates the latest full charge capacity FCC (ST13 in FIG. 5). ).

The storage battery unit 1 transmits a capacity measurement request flag indicating the completion of the capacity measurement to the power conversion unit 2. Further, the storage battery unit 1 transmits a capacity measurement charge permission flag indicating charge permission and a capacity measurement discharge permission flag indicating discharge permission to the power conversion unit 2. At this time, the power conversion unit 2 is in a state of waiting for the capacity measurement end instruction (S26 in FIG. 6). The power conversion unit 2 recognizes that the full charge capacity FCC of each rechargeable battery module 111 has been updated by receiving the capacity measurement request flag (ST14 in FIG. 5).

The power conversion unit 2 transmits a capacity measurement status flag indicating that the capacity measurement is completed to the storage battery unit 1. The storage battery unit 1 recognizes that the capacity measurement has been completed by the capacity measurement status flag (ST15 in FIG. 5). The storage battery unit 1 transmits a capacity measurement request flag indicating that capacity measurement has not been requested to the power conversion unit 2. The power conversion unit 2 recognizes that the capacity measurement has been completed by receiving the capacity measurement request flag (ST16 in FIG. 5). Then, the power conversion unit 2 transmits a capacity measurement status flag indicating that the capacity measurement has not been performed to the storage battery unit 1.

On the other hand, when the storage battery unit 1 and the power conversion unit 2 are waiting for a full charge capacity update, for example, when the temperature of a certain storage battery module 111 falls out of a predetermined range, the storage battery unit 1 detects an abnormality of the storage battery module 111. .. In this case, the storage battery unit 1 and the power conversion unit 2 cannot perform capacity measurement (S27 in FIG. 6). The storage battery unit 1 transmits a capacity measurement request flag indicating that the capacity measurement has failed to the power conversion unit 2. Upon receiving this capacity measurement request flag, the power conversion unit 2 transmits a capacity measurement status flag indicating that the capacity measurement has not been performed to the storage battery unit 1. The storage battery unit 1 transmits a capacity measurement request flag indicating unrequested, a capacity measurement charge permission flag indicating charge permission, and a capacity measurement discharge permission flag indicating discharge permission to the power conversion unit 2. As a result, the storage battery unit 1 and the power conversion unit 2 shift from the capacity measurement operation (S2 in FIG. 6) to the normal operation (S1 in FIG. 6).

(4) Effect In the storage battery capacity detection method and the storage battery capacity detection system 20 according to the present embodiment, the full charge capacity FCC is calculated for each storage battery module 111 based on the first change amount and the second change amount. Therefore, by using the full charge capacity FCC for each storage battery module 111, the full charge capacity of the storage battery unit 1 can be detected with high accuracy. Further, for each storage battery module 111, the degree of deterioration of each storage battery module 111 can be calculated by comparing the full charge capacity FCC with the rated capacity (initial full charge capacity). Further, the discharge is stopped when the first storage battery module 111A is in a completely discharged state, and the charging is stopped when the second storage battery module 111B is in a fully charged state, so that the remaining storage battery module 111 is over-discharged. And overcharging can be suppressed.

In the storage battery capacity detection method and the storage battery capacity detection system 20 according to the present embodiment, the lower limit of the storage amount of the first storage battery module 111A is zero, and the upper limit of the storage amount of the first storage battery module 111A is the first storage battery module. It has a full charge capacity of 111A. By increasing the difference between the first remaining capacity and the second remaining capacity in this way, the full charge capacity of each storage battery module 111 can be calculated accurately.

In the storage battery capacity detection method and the storage battery capacity detection system 20 according to the present embodiment, the first storage battery module 111A and the second storage battery module 111B are the same storage battery module 111. Then, by charging the first storage battery module 111A from the lower limit value to the upper limit value, the full charge capacity of each storage battery module 111 can be calculated.

In the storage battery capacity detection method and the storage battery capacity detection system 20 according to the present embodiment, the minimum full charge capacity among the plurality of full charge capacities of the plurality of storage battery modules 111 is set as the full charge capacity of the storage battery unit 1. Therefore, overcharging and overdischarging of each storage battery module 111 can be suppressed.

In the storage battery capacity detection method and the storage battery capacity detection system 20 according to the present embodiment, the ratio of the fully charged capacity of the storage battery unit 1 to the rated capacity of the storage battery unit 1 is defined as the degree of deterioration of the storage battery unit 1, and this degree of deterioration is predetermined. When it falls below the threshold value, it is determined that the life of the storage battery unit 1 is reached. Thereby, the life of the storage battery unit 1 can be determined.

In the storage battery capacity detection method and the storage battery capacity detection system 20 according to the present embodiment, the capacity is measured according to the state of the storage battery unit 1. As a result, the capacity can be measured according to the state of the storage battery unit 1.

(5) Modified Example The above-described embodiment is only one of the various embodiments of the present disclosure. The above-described embodiment can be changed in various ways depending on the design and the like as long as the object of the present disclosure can be achieved. Further, the storage battery capacity detection method according to the above-described embodiment and the same functions as the storage battery capacity detection system 20 may be realized by a computer program, a non-temporary recording medium on which the computer program is recorded, or the like. The program according to one aspect is a program for causing one or more processors to execute the above-mentioned storage battery capacity detection method.

Hereinafter, modifications of the above-described embodiment will be listed. The modifications described below can be applied in combination as appropriate.

In the storage battery capacity detection system 20 in the present disclosure, the control circuit 13 includes a computer system. The main configuration of a computer system is a processor and memory as hardware. The function as the control circuit 13 in the present disclosure is realized by the processor executing the program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, may be provided through a telecommunications line, and may be recorded on a non-temporary recording medium such as a memory card, optical disk, hard disk drive, etc. readable by the computer system. May be provided. A processor in a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI). The integrated circuit such as IC or LSI referred to here has a different name depending on the degree of integration, and includes an integrated circuit called a system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Further, an FPGA (Field-Programmable Gate Array) programmed after the LSI is manufactured, or a logical device capable of reconfiguring the junction relationship inside the LSI or reconfiguring the circuit partition inside the LSI should also be adopted as a processor. Can be done. A plurality of electronic circuits may be integrated on one chip, or may be distributed on a plurality of chips. The plurality of chips may be integrated in one device, or may be distributed in a plurality of devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

Further, it is not an essential configuration for the storage battery capacity detection system 20 that a plurality of functions in the storage battery capacity detection system 20 are integrated in one housing. That is, the components of the storage battery capacity detection system 20 may be distributed and provided in a plurality of housings. Further, at least a part of the functions of the storage battery capacity detection system 20, for example, the functions of the control circuit 13 may be realized by the cloud (cloud computing) or the like.

In the above-described embodiment, the case where the lower limit of the storage amount of the first storage battery module 111A is zero and the upper limit of the storage amount of the second storage battery module 111B is the full charge capacity of the second storage battery module 111B is illustrated. There is. On the other hand, the lower limit value is not limited to zero, and any value smaller than the upper limit value can be set. Further, the upper limit value is not limited to the full charge capacity of the second storage battery module 111B, and can be set to any value as long as it is larger than the lower limit value.

In the above-described embodiment, the capacity measurement is performed according to the state of the storage battery unit 1, but the capacity measurement may be performed according to an external command. The external command may be, for example, a command from the server 5 or a command from the remote controller 3. In this case, the server 5 or the remote controller 3 manages the execution history of the capacity measurement performed so far. Then, the server 5 or the remote controller 3 outputs a command for carrying out the capacity measurement to the storage battery unit 1 when a certain period (for example, one year) or more has elapsed from the previous capacity measurement. As a result, it is not necessary for the storage battery unit 1 to manage the execution history of the capacity measurement, and the memory capacity of the storage battery unit 1 can be reduced accordingly.

In the above-described embodiment, the capacity is automatically measured according to the state of the storage battery unit 1, but for example, the capacity may be measured when the user (for example, a resident of a house) permits it. In other words, the storage battery capacity detection method may further include a reception step for accepting user operations. Then, when the permission operation, which is an operation of the user for permitting the execution of the capacity measurement, is accepted in the reception step, the capacity measurement may be performed. Specifically, for example, the display unit of the remote controller 3 indicates that the capacity measurement needs to be performed. Then, the user who sees this display starts the capacity measurement by performing an operation of permitting the operation unit of the remote controller 3 to perform the capacity measurement. As a result, the capacity can be measured at the will of the user.

Further, the operation unit of the remote controller 3 may be able to postpone (cancel) the execution of the capacity measurement. In other words, when the postponement operation, which is the user's operation for postponing the execution of the capacity measurement, is accepted in the reception step, the execution of the capacity measurement may be postponed. Specifically, for example, the display unit of the remote controller 3 indicates that the capacity measurement needs to be performed. Then, the user who sees this display postpones the execution of the capacity measurement by performing an operation of postponing the execution of the capacity measurement on the operation unit of the remote controller 3. As a result, the implementation of the capacity measurement can be postponed at the will of the user. However, if the capacity measurement is continuously postponed, the capacity measurement will not be performed for a long period of time. Therefore, for example, if the postponement operation is performed three times in a row in the reception step, the capacity measurement is forced. It is preferable to carry out the procedure. Specifically, when the user performs the postponement operation three times in a row, the display unit of the remote controller 3 displays the next scheduled implementation date and forcibly performs the capacity measurement on the scheduled implementation date. indicate. The storage battery capacity detection system 20 forcibly performs the capacity measurement on the scheduled implementation date. As a result, it is possible to suppress a situation in which the capacity measurement is not performed for a long period of time.

In the above-described embodiment, the first acquisition unit 201 for acquiring the first remaining capacity and the second acquisition unit 202 for acquiring the second remaining capacity are separately provided, but the first acquisition unit 201 and the second acquisition unit 201 are provided separately. The acquisition unit 202 may be one acquisition unit. Further, in the above-described embodiment, the first calculation unit 203 for calculating the first change amount and the second calculation unit 204 for calculating the full charge capacity are separately provided, but the first calculation unit 203 and the first calculation unit 203 are provided separately. 2 The calculation unit 204 may be one calculation unit.

In the above-described embodiment, the first storage battery module 111A is one storage battery module 111, but the first storage battery module 111A may be two or more storage battery modules 111. That is, if the two or more storage battery modules 111 are in the completely discharged state earliest when the plurality of storage battery modules 111 are discharged, the two or more storage battery modules 111 may be the first storage battery module 111A.

Further, in the above-described embodiment, the second storage battery module 111B is one storage battery module 111, but the second storage battery module 111B may be two or more storage battery modules 111. That is, if the two or more storage battery modules 111 are in the fully charged state earliest when the plurality of storage battery modules 111 are being charged, the two or more storage battery modules 111 may be the second storage battery module 111B.

In the above embodiment, when it is detected that the temperature of the storage battery module 111 is out of the predetermined range, the capacity measurement is stopped. However, for example, a communication abnormality occurs between the storage battery unit 1 and the power conversion unit 2. If this happens, the capacity measurement may be stopped.

In the above-described embodiment, the capacity measurement is performed when a certain period (for example, one year) or more has passed, but for example, the capacity measurement may be performed when the number of charge / discharge times exceeds a specified number of times. ..

In the above-described embodiment, the plurality of storage battery blocks 11 are connected in parallel and electrically to the power conversion unit 2, but the plurality of storage battery blocks 11 are connected in series and electrically to the power conversion unit 2. It may have been.

(Summary)
As described above, the storage battery capacity detecting method according to the first aspect is a storage battery capacity detecting method for detecting the full charge capacity of the storage battery unit (1) including the plurality of storage battery modules (111). Each of the plurality of storage battery modules (111) has at least one cell battery (1111) and is connected in series with each other. In the storage battery capacity detection method, the capacity measurement including the first acquisition step, the charging step, the first calculation step, the second acquisition step, and the second calculation step is performed. In the first acquisition step, when the storage amount of the first storage battery module (111A) is the lower limit value, the first remaining capacity is acquired for each of the plurality of storage battery modules (111) based on the first open circuit voltage. The first storage battery module (111A) is at least one storage battery module (111) out of a plurality of storage battery modules (111). In the charging step, charging is performed until the stored amount of the second storage battery module (111B) reaches the upper limit value. The second storage battery module (111B) is at least one storage battery module (111) among the plurality of storage battery modules (111). In the first calculation step, the first change amount is calculated for each of the plurality of storage battery modules (111) based on the integrated value of the charging current in the charging step. The first change amount is the change amount of the integrated value. In the second acquisition step, when the storage amount of the second storage battery module (111B) is the upper limit value, the second remaining capacity is acquired for each of the plurality of storage battery modules (111) based on the second open circuit voltage. In the second calculation step, the full charge capacity of each of the plurality of storage battery modules (111) is calculated based on the first change amount and the second change amount. The second change amount is the difference between the first remaining capacity and the second remaining capacity.

According to this aspect, by using the full charge capacity of each storage battery module (111), the full charge capacity of the storage battery unit (1) can be detected with high accuracy.

In the storage battery capacity detection method according to the second aspect, the lower limit value is zero in the first aspect.

According to this aspect, the full charge capacity of each storage battery module (111) can be calculated accurately.

In the storage battery capacity detection method according to the third aspect, in the first or second aspect, the upper limit value is the full charge capacity of the second storage battery module (111B).

According to this aspect, the full charge capacity of each storage battery module (111) can be calculated accurately.

In the storage battery capacity detection method according to the fourth aspect, in any one of the first to third aspects, the first storage battery module (111A) and the second storage battery module (111B) are the same storage battery module (111).

According to this aspect, by charging the first storage battery module (111A) from the lower limit value to the upper limit value, the full charge capacity of each storage battery module (111) can be calculated accurately.

The storage battery capacity detection method according to the fifth aspect further includes a reception step for accepting a user's operation in any one of the first to fourth aspects. In the storage battery capacity detection method, the capacity measurement is performed when the permission operation, which is the user's operation for permitting the performance of the capacity measurement, is received in the reception step.

According to this aspect, the capacity measurement can be performed at the will of the user.

The storage battery capacity measuring method according to the sixth aspect further includes a reception step for accepting a user operation in any one of the first to fifth aspects. In the storage battery capacity detection method, when the postponement operation, which is the user's operation for postponing the capacity measurement, is accepted in the reception step, the capacity measurement is postponed.

According to this aspect, the implementation of the capacity measurement can be postponed at the will of the user.

In the storage battery capacity detection method according to the seventh aspect, in the sixth aspect, when the postponement operation is continuously received a plurality of times in the reception step, the capacity measurement is forcibly performed.

According to this aspect, the capacity measurement can be forcibly performed regardless of the intention of the user, and it is possible to suppress the situation where the capacity measurement is not performed for a long period of time.

In the storage battery capacity detection method according to the eighth aspect, in any one of the first to seventh aspects, the storage battery unit (1) has the smallest fully charged capacity among the plurality of fully charged capacities of the plurality of storage battery modules (111). ) Full charge capacity.

According to this aspect, overcharging and overdischarging of each storage battery module (111) can be suppressed.

The storage battery capacity detection method according to the ninth aspect further includes a determination step in the eighth aspect. In the determination step, the ratio of the fully charged capacity of the storage battery unit (1) to the rated capacity of the storage battery unit (1) is defined as the degree of deterioration of the storage battery unit (1), and when this degree of deterioration falls below a predetermined threshold value, the storage battery unit This is the step of determining the life of (1).

According to this aspect, the life of the storage battery unit (1) can be determined.

In the storage battery capacity detection method according to the tenth aspect, the capacity is measured in response to an external command in any one of the first to ninth aspects.

According to this aspect, the capacity measurement can be performed in response to an external command.

In the storage battery capacity detection method according to the eleventh aspect, the capacity is measured according to the state of the storage battery unit (1) in any one of the first to ninth aspects.

According to this aspect, the capacity measurement can be performed according to the state of the storage battery unit (1).

The program according to the twelfth aspect is a program for causing one or more processors to execute the storage battery capacity detection method according to any one of the first to eleventh aspects.

According to this aspect, by using the full charge capacity of each storage battery module (111), the full charge capacity of the storage battery unit (1) can be detected with high accuracy.

The storage battery capacity detection system (20) according to the thirteenth aspect is a storage battery capacity detection system (20) that detects the full charge capacity of the storage battery unit (1) including a plurality of storage battery modules (111). Each of the plurality of storage battery modules (111) has at least one cell battery (1111) and is connected in series with each other. The storage battery capacity detection system (20) includes a first acquisition unit (201), a charging unit (205), a first calculation unit (203), a second acquisition unit (202), and a second calculation unit (204). And. The first acquisition unit (201) acquires the first remaining capacity of each of the plurality of storage battery modules (111) based on the first open circuit voltage when the storage amount of the first storage battery module (111A) is the lower limit value. .. The first storage battery module (111A) is at least one storage battery module (111) out of a plurality of storage battery modules (111). The charging unit (205) charges the second storage battery module (111B) until the amount of electricity stored reaches the upper limit. The second storage battery module (111B) is at least one storage battery module (111) among the plurality of storage battery modules (111). The first calculation unit (203) calculates the first change amount for each of the plurality of storage battery modules (111) based on the integrated value of the charging current by the charging unit (205). The first change amount is the change amount of the integrated value. The second acquisition unit (202) acquires the second remaining capacity of each of the plurality of storage battery modules (111) based on the second open circuit voltage when the storage amount of the second storage battery module (111B) is the above upper limit value. To do. The second calculation unit (204) calculates the full charge capacity of each of the plurality of storage battery modules (111) based on the first change amount and the second change amount. The second change amount is the difference between the first remaining capacity and the second remaining capacity.

According to this aspect, by using the full charge capacity of each storage battery module (111), the full charge capacity of the storage battery unit (1) can be detected with high accuracy.

The configuration according to the second to eleventh aspects is not an essential configuration for the storage battery capacity detection method, and can be omitted as appropriate.

1 Storage battery unit 111 Storage battery module 111A 1st storage battery module 111B 2nd storage battery module 1111 Single battery 20 Storage battery capacity detection system 201 1st acquisition unit 202 2nd acquisition unit 203 1st calculation unit 204 2nd calculation unit 205 Charging unit

Claims (13)

A storage battery capacity detection method for detecting the full charge capacity of a storage battery unit having at least one cell and a plurality of storage battery modules connected in series to each other.
When the storage amount of the first storage battery module, which is at least one storage battery module, is the lower limit value among the plurality of storage battery modules, the first remaining capacity is acquired for each of the plurality of storage battery modules based on the first open circuit voltage. The first acquisition step to do and
A charging step of charging until the storage amount of the second storage battery module, which is at least one of the plurality of storage battery modules, reaches the upper limit value.
A first calculation step for calculating a first change amount, which is a change amount of the integrated value, for each of the plurality of storage battery modules based on the integrated value of the charging current in the charging step.
A second acquisition step of acquiring a second remaining capacity based on a second open circuit voltage for each of the plurality of storage battery modules when the storage amount of the second storage battery module is the upper limit value.
With the second calculation step of calculating the full charge capacity for each of the plurality of storage battery modules based on the first change amount and the second change amount which is the difference between the first remaining capacity and the second remaining capacity. Perform volumetric measurements, including
Storage battery capacity detection method. The lower limit is zero,
The storage battery capacity detection method according to claim 1. The upper limit value is the full charge capacity of the second storage battery module.
The storage battery capacity detection method according to claim 1 or 2. The first storage battery module and the second storage battery module are the same storage battery module.
The storage battery capacity detection method according to any one of claims 1 to 3. Including a reception step that accepts user operations
When the permission operation, which is the operation of the user for permitting the execution of the capacity measurement, is accepted in the reception step, the capacity measurement is performed.
The storage battery capacity detection method according to any one of claims 1 to 4. Including a reception step that accepts user operations
When the postponement operation, which is an operation of the user for postponing the execution of the capacity measurement, is accepted in the reception step, the execution of the capacity measurement is postponed.
The storage battery capacity detection method according to any one of claims 1 to 5. When the postponement operation is continuously received a plurality of times in the reception step, the capacity measurement is forcibly performed.
The storage battery capacity detection method according to claim 6. Of the plurality of fully charged capacities of the plurality of storage battery modules, the smallest fully charged capacity is defined as the fully charged capacity of the storage battery unit.
The storage battery capacity detection method according to any one of claims 1 to 7. The ratio of the fully charged capacity of the storage battery unit to the rated capacity of the storage battery unit is defined as the degree of deterioration of the storage battery unit, and a determination step of determining the life of the storage battery unit when the degree of deterioration falls below a predetermined threshold value is further added. Including,
The storage battery capacity detection method according to claim 8. Perform the capacity measurement in response to an external command,
The storage battery capacity detection method according to any one of claims 1 to 9. The capacity measurement is performed according to the state of the storage battery unit.
The storage battery capacity detection method according to any one of claims 1 to 9. A program for causing one or more processors to execute the storage battery capacity detection method according to any one of claims 1 to 11. A storage battery capacity detection system that detects the full charge capacity of a storage battery unit including at least one cell and a plurality of storage battery modules connected in series with each other.
When the storage amount of the first storage battery module, which is at least one storage battery module, is the lower limit value among the plurality of storage battery modules, the first remaining capacity is acquired for each of the plurality of storage battery modules based on the first open circuit voltage. The first acquisition department to do
A charging unit that charges the second storage battery module, which is at least one of the plurality of storage battery modules, until the storage amount reaches the upper limit.
A first calculation unit that calculates a first change amount, which is a change amount of the integrated value, for each of the plurality of storage battery modules based on the integrated value of the charging current by the charging unit.
When the storage amount of the second storage battery module is the upper limit value, the second acquisition unit that acquires the second remaining capacity based on the second open circuit voltage for each of the plurality of storage battery modules.
With the second calculation unit that calculates the full charge capacity for each of the plurality of storage battery modules based on the first change amount and the second change amount that is the difference between the first remaining capacity and the second remaining capacity. , With
Storage battery capacity detection system.

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