JP2018174058A - Device for determining whether or not power storage device can be operated - Google Patents

Abstract

Whether or not a power storage device can be operated according to an operation profile is determined in a short time. A selected module battery that is part of a plurality of module batteries is selected. The resource matrix includes a plurality of portions respectively corresponding to a plurality of charge / discharge power values. Each portion includes a set of a discharge depth value and a temperature value, and a set of a discharge depth value change amount and a temperature value change amount. In the i-th calculation, the i-th charge / discharge power value in the period from the i-th time to the (i + 1) -th time is specified from the operation profile, and the charge / discharge power value corresponding to the i-th charge / discharge power value is determined. A portion corresponding to the selected charge / discharge power value is selected, and a set of the discharge depth value and the temperature value at the (i + 1) th time is calculated from the set of the discharge depth value and the temperature value at the (i) th time. It is determined that the power storage device can be operated according to the operation profile when the combination of the depth of discharge value and the temperature value at the first to n-th times does not deviate from the restriction. [Selection] Figure 1

Description

  The present invention relates to an apparatus for determining whether or not an electric power storage device can be operated.

  A power storage device using a sodium-sulfur battery includes a plurality of module batteries. Each module battery contains a plurality of single cells. Each single cell is a sodium-sulfur battery. Each unit cell includes a receiving container. The storage container stores a negative electrode, a positive electrode, and β-alumina that is a solid electrolyte. The negative electrode contains sodium which is a negative electrode active material. The positive electrode contains sodium sulfide which is a positive electrode active material.

  When the power storage device is operated, charging / discharging is performed on each module battery. When charging / discharging is performed on each module battery, charging / discharging is performed on each single battery built in each module battery. When each unit cell is discharged, sodium ions move from the negative electrode to the positive electrode through the solid electrolyte inside each unit cell. When each unit cell is charged, sodium ions move from the positive electrode to the negative electrode through the solid electrolyte inside each unit cell.

  The sodium-sulfur battery is a high temperature operation type secondary battery. In order to increase the sodium ion conductivity of the solid electrolyte contained in each unit cell, the temperature of the solid electrolyte must be high, In order to make the negative electrode active material and the positive electrode active material contained in each unit cell into a molten state so that sodium ions can easily move in the positive electrode and the negative electrode, the temperature of the positive electrode and the negative electrode must be high. Don't be. For this reason, when charging / discharging is performed on each unit cell, the inside of each module cell is heated so that the temperature of each unit cell is approximately 280 ° C. or higher.

  When each unit cell is overdischarged, the negative electrode active material is deficient, and each unit cell cannot be further discharged. On the contrary, when each unit cell is overcharged, the solid electrolyte tube is damaged, and each unit cell cannot be further charged. For this reason, when the power storage device is operated, the operation must be performed so that the discharge depth value of each unit cell does not deviate from the limit, and the discharge depth value of each module battery does not deviate from the limit. Driving must be done.

  Also, if the temperature of each unit cell becomes too high while charging / discharging each unit cell, the internal pressure of each unit cell becomes abnormally high, the negative electrode active material due to damage of the solid electrolyte, etc. There is a possibility that the storage container may be damaged due to the phenomenon that the battery directly contacts the positive electrode active material and the temperature of each unit cell rises abnormally. On the other hand, if the temperature of each unit cell becomes too low while charging / discharging each unit cell, sodium ions cannot easily move in the positive electrode and the negative electrode, and the solid electrolyte sodium The ionic conductivity is lowered, and charging / discharging of each unit cell cannot be performed efficiently. For this reason, when the power storage device is operated, the operation must be performed so that the temperature value of each unit cell does not deviate from the limit, and the operation is performed so that the temperature value of each module battery does not deviate from the limit. Must be done.

  On the other hand, it may be necessary to determine whether or not the power storage device can be operated in accordance with an operation profile that specifies a time change in input / output power. In the determination, when the power storage device is operated according to the operation profile, it is checked whether or not the discharge depth value and the temperature value of each module battery are out of the limit. The technique described in Patent Document 1 is an example.

  In the technique described in Patent Document 1, the remaining battery capacity and battery temperature of the sodium-sulfur battery at the final time of the time period are predicted based on the operation output for each time period, and the remaining capacity is used as a reference until the final time. It is determined whether or not the battery can be operated without becoming below and without the battery temperature becoming abnormal (paragraph 0032 of Patent Document 1).

  In the technique described in Patent Document 2, whether or not the power storage device can be operated is not directly determined, but a charge / discharge power value and a charge / discharge time value that can be employed in the sodium-sulfur battery are calculated ( (Patent Document 2, paragraphs 0029-0030). In the calculation of the charge / discharge power value and the charge / discharge time value, a lookup table is referred to (paragraph 0070 of Patent Document 2). The lookup table includes a plurality of sets of temperature values and state of charge (SOC) values, and further includes a plurality of sets of charge / discharge power values and charge / discharge time values respectively corresponding to the sets of temperature values and SOC values. (Paragraphs 0035, 0041, 0047 and 0064 of Patent Document 2).

JP 2008-210586A International Publication No. 2016/136445

  In order to predict changes with time of the discharge depth value and the temperature value of one module battery when the power storage device is operated according to the operation profile, complicated calculation is required. For this reason, in order to check whether the discharge depth value and the temperature value of one module battery are out of the limits when the power storage device is operated according to the operation profile, a complicated calculation is required.

  In addition, the power storage device includes a plurality of module batteries as described above, and the deterioration states of the plurality of module batteries are different from each other. For this reason, when the power storage device is operated according to the operation profile, the temporal changes in the discharge depth values and the temperature values of the plurality of module batteries are different from each other. Therefore, in order to check whether the discharge depth value and the temperature value of each module battery are out of the limits when the power storage device is operated according to the operation profile, the above complex calculation must be performed for all the module batteries. I must.

  These means that it cannot be determined in a short time whether or not the power storage device can be operated according to the operation profile.

  This problem also occurs when the power storage device includes a secondary battery other than the sodium-sulfur battery, and when the operation is performed so that the indicators other than the combination of the discharge depth value and the temperature value are not out of the limit. .

  The present invention aims to solve these problems. The problem to be solved by the present invention is to determine in a short time whether or not the power storage device can be operated according to the operation profile.

  The power storage device includes a plurality of module batteries.

  The device that determines whether or not the power storage device can be operated includes a storage mechanism, a calculation mechanism, and a determination mechanism.

  The storage mechanism stores a look-up table applied to each selected module battery that is each of at least one selected module battery that is part of the plurality of module batteries. The lookup table includes a plurality of portions respectively corresponding to a plurality of charge / discharge conditions. Each part that is each of the plurality of parts includes a plurality of indicators of the state at the start of charging / discharging and a plurality of indicators of the state at the end of charging / discharging. When each selected module battery has a plurality of indicators of the state at the beginning of charging / discharging when charging / discharging for a specific time according to charging / discharging conditions corresponding to each part is started, The plurality of state indicators at the start of charging / discharging and the plurality of state indicators at the end of charging / discharging are determined so as to have a plurality of state indicators at the end of charging / discharging.

  The calculation mechanism obtains an operation profile that specifies the time change of the input / output power of the power storage device, and obtains an index of the state of each selected module battery at the first time. The calculation mechanism performs calculations from the first order to the (n-1) th order for each selected module battery. The calculation mechanism specifies, from the operation profile, the i-th charge / discharge condition in the period from the i-th time to the (i + 1) -th time in the i-th calculation that is each of the calculations from the primary to the (n-1) th. The corresponding charging / discharging condition corresponding to the i-th charging / discharging condition is selected from a plurality of charging / discharging conditions, and the portion corresponding to the corresponding charging / discharging condition is referred to, and the state index at the i-th time of each selected module battery An index of the state of each selected module battery at the (i + 1) th time is calculated. The (i + 1) th time comes after the ith time. n is an integer of 3 or more.

  The determination mechanism determines that the power storage device can be operated according to the operation profile when the state index of the at least one selected module battery at the first to nth times does not deviate from the restriction. The determination mechanism determines that the power storage device cannot be operated according to the operation profile when the state index at the first to nth times of the at least one selected module battery deviates from the restriction.

  According to the present invention, a part of a plurality of module batteries is selected, and a lookup table applied to each selected module battery is referred to, so that it is necessary to determine whether or not the module battery state index is out of the limit. The calculation is simplified, and it is determined in a short time whether or not the power storage device can be operated according to the operation profile.

  The objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

It is a block diagram illustrating the power storage equipment of an embodiment. It is a block diagram illustrating the power storage device provided in the power storage facility of the embodiment. It is a circuit diagram illustrating an assembled battery provided in the power storage facility of the embodiment. 5 is a table illustrating the relationship among the number of charge / discharge cycles, the number of unit cell failures, a resource matrix for discharge depth values, and a resource matrix for temperature values in the power storage facility of the embodiment. FIG. 3 is a relationship diagram illustrating the relationship among the number of charge / discharge cycles, the number of unit cell failures, the resource matrix for discharge depth values, and the resource matrix for temperature values in the power storage facility of the embodiment. It is a schematic diagram which illustrates the source matrix for the depth-of-discharge value memorize | stored in the power storage equipment of embodiment. It is a schematic diagram which illustrates the source matrix for temperature values memorize | stored in the power storage equipment of embodiment. It is a relationship figure which illustrates the relationship of the depth value of discharge, temperature value, discharge depth value change, and temperature value change in the electric power storage equipment of embodiment. It is a flowchart which illustrates the flow of determination of the propriety of the driving | operation of an electric power storage apparatus in the electric power storage equipment of embodiment. It is a graph which illustrates the example of the driving profile inputted into the power storage equipment of an embodiment. It is a flowchart which illustrates the flow of selection of the resource matrix for the depth of discharge value and the resource matrix for temperature values which are applied to each selection module battery in the electric power storage equipment of embodiment. 6 is a flowchart illustrating a flow of calculation of a set of discharge depth values and temperature values at times t (2),..., T (n) of each selected module battery in the power storage facility of the embodiment.

1 Power Storage Facility FIG. 1 is a block diagram illustrating a power storage facility according to an embodiment.

  The power storage facility 1000 illustrated in FIG. 1 includes a power storage device 1020, a control device 1021, a determination device 1022, and a monitoring device 1023. The power storage facility 1000 may include components other than these components.

  When the power storage device 1020 is operated, power is output from the power storage device 1020 to the grid 1040, and power is input from the grid 1040 to the power storage device 1020.

  The control device 1021 transmits a control signal to the power storage device 1020. The power storage device 1020 receives the transmitted control signal and operates according to the received control signal. Thereby, the input / output power of the power storage device 1020 is controlled.

  The control device 1021 supplies heater power to the power storage device 1020. The power storage device 1020 receives the supplied heater power and converts the received heater power into heat. As a result, the sodium-sulfur battery built in the power storage device 1020 is heated.

  In addition, the control device 1021 supplies fan power to the power storage device 1020. The power storage device 1020 receives the supplied fan power, and generates an air flow using the received fan power. Thereby, the sodium-sulfur battery built in the power storage device 1020 is cooled.

  The power storage device 1020 transmits the voltage value, current value, and temperature value of the built-in sodium-sulfur battery. The control device 1021 receives the transmitted voltage value, current value, and temperature value, and calculates the discharge depth value of the sodium-sulfur battery, the number of charge / discharge cycles, and the number of single cell failures from the history of the received voltage value and current value. Then, the received temperature value, the calculated depth of discharge value, the number of charge / discharge cycles, and the number of single cell failures are transmitted to the determination device 1022. The determination device 1022 receives the transmitted temperature value, discharge depth value, number of charge / discharge cycles, and number of single cell failures, and based on the received temperature value, discharge depth value, number of charge / discharge cycles, and number of single cell failures, It is determined whether or not the power storage device 1020 can be operated according to the input operation profile, and a determination result indicating whether or not the power storage device 1020 can be operated is transmitted to the monitoring device 1023. The monitoring apparatus 1023 receives the transmitted determination result and displays the received determination result.

2 Power Storage Device FIG. 2 is a block diagram illustrating a power storage device provided in the power storage facility of the embodiment.

  As shown in FIG. 2, the power storage device 1020 includes four module battery rows 1060, 1061, 1062 and 1063, and a transformer 1080. The power storage device 1020 may include components other than these components. Four module battery rows 1060, 1061, 1062, and 1063 may be replaced with three or less module battery rows.

  Each of the module battery arrays 1100, which are each of the module battery arrays 1060, 1061, 1062, and 1063, includes ten module batteries 1120, 1121,..., 1122, a current sensor 1140, and a quadrature converter (PCS) 1141. Each module battery row 1100 may include components other than these components. Ten module batteries 1120, 1121,..., 1122 may be replaced with 9 or less or 11 or more module batteries.

  Each of the module batteries 1160, 1121,..., 1122 includes an assembled battery 1180, a heater 1181, a heat radiating duct 1182, a blower fan 1183, a voltage sensor 1184, and a temperature sensor 1185. Each module battery 1160 may include components other than these components.

  Module battery rows 1060, 1061, 1062, and 1063 are electrically connected in parallel. Module battery rows 1060, 1061, 1062 and 1063 connected in parallel are electrically connected to system 1040 via transformer 1080. Module batteries 1120, 1121,..., 1122 are electrically connected in series. The serially connected module batteries 1120, 1121,..., 1122 are electrically connected to the transformer 1080 via the current sensor 1140 and the PCS 1141.

  When power is output from the power storage device 1020 to the grid 1040, power is output from at least one module battery array included in the module battery arrays 1060, 1061, 1062, and 1063, and the output power is converted into the transformer 1080. And the boosted power is output to the grid 1040. When power is input from the grid 1040 to the power storage device 1020, the power is input to the transformer 1080, the input power is stepped down by the transformer 1080, and the stepped down power is supplied to the module battery rows 1060, 1061, and 1062. And 1063 are input to at least one module battery row. The power output from at least one module battery row is stepped down by the transformer 1080, and the power input from the system is allowed to be boosted by the transformer 1080.

  When power is output from each module battery row 1100, the PCS 1141 belonging to each module battery row 1100 converts power having a power value specified by the control signal received from the control device 1021 from DC power to AC power, Each module battery 1160 belonging to each module battery row 1100 is discharged. When power is input to each module battery row 1100, the PCS 1141 belonging to each module battery row 1100 converts power having a power value specified by the control signal received from the control device 1021 from AC power to DC power, Each module battery 1160 belonging to each module battery row 1100 is charged.

  When each module battery 1160 is discharged, the assembled battery 1180 belonging to each module battery 1160 is discharged. When each module battery 1160 is charged, the assembled battery 1180 belonging to each module battery 1160 is charged.

  The current sensor 1140 belonging to each module battery row 1100 detects a current flowing through each module battery row 1100 and outputs a current value of each module battery row 1100 indicating the magnitude of the detected current. Since the module batteries 1120, 1121,..., 1122 belonging to each module battery array 1100 are connected in series, the output current value of each module battery array 1100 is the current of each module battery 1160 belonging to each module battery array 1100. It is identified with the value.

  The heater 1181 belonging to each module battery 1160 converts the heater power received from the control device 1021 into heat, and heats the inside of each module battery 1160.

  The blower fan 1183 belonging to each module battery 1160 generates an air flow that flows through the heat radiating duct 1182 belonging to each module battery 1160 using the fan power received from the control device 1021. The generated air flow carries heat from the inside of each module battery 1160 to the outside of each module battery 1160. Thereby, the inside of each module battery 1160 is cooled. The cooling mechanism including the heat radiating duct 1182 and the blower fan 1183 may be replaced with another cooling mechanism.

  The voltage sensor 1184 belonging to each module battery 1160 detects the voltage of each module battery 1160 and outputs the voltage value of each module battery 1160 indicating the magnitude of the detected voltage.

  The temperature sensor 1185 belonging to each module battery 1160 detects the temperature inside each module battery 1160 and outputs the temperature value of each module battery 1160 indicating the detected temperature level.

3 Assembled Battery FIG. 3 is a circuit diagram illustrating the assembled battery provided in the power storage device of the embodiment.

  The assembled battery 1180 includes four blocks 1200, 1201, 1202, and 1203 as shown in FIG. Each block 1220, which is each of the blocks 1200, 1201, 1202, and 1203, includes twelve strings 1240, 1241, 1242,. Each of the strings 1240, 1241, 1242,..., 1243 includes eight unit cells 1280, 1281, 1282,. Each of the single cells 1280, 1281, 1282,..., 1283 is a sodium-sulfur battery. Each single battery 1300 may be a high temperature operation type secondary battery other than a sodium-sulfur battery. Each single battery 1300 may be a secondary battery that is not a high-temperature operation type, such as a lithium secondary battery. When each single battery 1300 is a secondary battery that is not a high-temperature operation type, the heater 1181 may be omitted. The assembled battery 1180 may include components other than the blocks 1200, 1201, 1202, and 1203. Each block 1220 may include components other than the strings 1240, 1241, 1242,. Each string 1260 may include components other than the single cells 1280, 1281, 1282,. The four blocks 1200, 1201, 1202, and 1203 may be replaced with three or less blocks or five or more blocks. Twelve strings 1240, 1241, 1242,..., 1243 may be replaced with 11 or fewer strings or 13 or more strings. Eight unit cells 1280, 1281, 1282,..., 1283 may be replaced with seven or less or nine or more unit cells.

  Blocks 1200, 1201, 1202 and 1203 are electrically connected in series. The strings 1240, 1241, 1242,..., 1243 are electrically connected in parallel. The single cells 1280, 1281, 1282,..., 1283 are electrically connected in series.

  When the assembled battery 1180 is discharged, each single battery 1300 belonging to the assembled battery 1180 is discharged. When the assembled battery 1180 is charged, each single battery 1300 belonging to the assembled battery 1180 is charged.

4. Determination Device The determination device 1022 is a device that determines whether or not the power storage device 1020 can be operated, and includes a storage mechanism 1320, a calculation mechanism 1321, and a determination mechanism 1322 as illustrated in FIG. Each of the storage mechanism 1320, the calculation mechanism 1321, and the determination mechanism 1322 includes an electronic component group and wiring that electrically connects the electronic component group. The electronic component group includes a processor, a memory, a comparator, an operational amplifier, and the like. The wiring includes a pattern on the substrate, a jumper wire, a cable, and the like.

  The storage mechanism 1320 stores a plurality of resource matrices 1340. Each resource matrix that is each of the plurality of resource matrices 1340 is a lookup table, and includes a plurality of discharge depth values and temperature value pairs, and a plurality of discharges respectively corresponding to the plurality of discharge depth value and temperature value pairs. Includes a set of depth value changes and temperature value changes. A combination of a plurality of discharge depth values and temperature values, and a combination of a plurality of discharge depth value changes and temperature value changes are obtained when a module battery to which each resource matrix is applied starts charging and discharging for 15 minutes. When the module battery has a discharge depth and temperature indicated by a set of depth value and temperature value, and the module battery has been charged / discharged for 15 minutes, the discharge indicated by a plurality of sets of change in discharge depth value and change in temperature value It is determined by simulation to have depth and temperature, respectively. A set of a plurality of discharge depth values and temperature values and a set of a plurality of discharge depth value changes and temperature value changes may be determined by experiment. The charging / discharging for 15 minutes may be replaced with charging / discharging for a specific time shorter or longer. For example, charging / discharging for 15 minutes may be replaced with charging / discharging for 30 minutes.

  The computing mechanism 1321 obtains an operation profile that designates the time change of the input / output power of the power storage device 1020, and each of the m selected module batteries that are part of the 40 module batteries provided in the power storage device 1020. A set of the discharge depth value and the temperature value of each selected module battery is obtained from the control device 1021. In addition, the calculation mechanism 1321 selects a resource matrix to be applied to each selected module battery from a plurality of stored resource matrices 1340. In addition, the calculation mechanism 1321 refers to the resource matrix applied to each selected module battery, and selects each selected from the obtained operation profile and the set of the discharge depth value and the temperature value at time t (1) of each selected module battery. A set of discharge depth value and temperature value at time t (2),..., T (n) of the module battery is calculated. The set of discharge depth value and temperature value at time t (1) is a set of measured values, and the set of discharge depth value and temperature value at time t (2), ..., t (n) is a calculated value. It is a pair.

  The determination mechanism 1322 does not include the discharge depth value at the time t (1),..., T (n) of the m selected module batteries that is greater than the upper discharge depth value. When the temperature value at time t (1),..., T (n) does not include a temperature value higher than the upper limit temperature value, it is determined that the power storage device 1020 can be operated according to the obtained operation profile. On the other hand, the determination mechanism 1322 determines that the m depths of the selected module batteries at time t (1),..., T (n) include discharge depth values larger than the upper limit discharge depth value and m selections. When the temperature value of the module battery at time t (1),..., T (n) includes a temperature value higher than the upper limit temperature value, it is determined that the power storage device 1020 cannot be operated according to the obtained operation profile. To do.

  The restriction that a discharge depth value larger than the upper limit discharge depth value is not included and a temperature value higher than the upper limit temperature value is not included may be replaced with another restriction. For example, a restriction that a discharge depth value greater than the upper limit discharge depth value is not included and a temperature value higher than the upper limit temperature value is not included, but a discharge depth value greater than the upper limit discharge depth value is not included, and a discharge depth value smaller than the lower limit discharge depth value is included. May be replaced with a restriction that a temperature value higher than the upper limit temperature value is not included and a temperature value lower than the lower limit temperature value is not included.

  An indicator of a state composed of a combination of a discharge depth value and a temperature value may be replaced with an indicator of another state. For example, a state index composed of a combination of a discharge depth value and a temperature value may be replaced with a state index composed of a pair of a state of charge (SOC) value and a temperature value. When an indicator of a state consisting of a combination of a depth of discharge value and a temperature value is replaced with an indicator of another state, there is also a restriction that a discharge depth value larger than the upper limit temperature value is not included and a temperature value higher than the upper limit temperature value is not included. Replaced by other restrictions. For example, when an indicator of a state consisting of a set of discharge depth value and temperature value is replaced with an indicator of a state consisting of a set of SOC value and temperature value, a discharge depth value greater than the upper limit discharge depth value is not included and the upper limit temperature value is exceeded. The restriction that does not include the high temperature value is replaced with the restriction that the SOC value that is lower than the lower limit SOC value is not included and the temperature value that is higher than the upper limit temperature value is not included.

  By selecting a part of the 40 module batteries provided in the power storage device 1020 and referring to the resource matrix applied to each selected module battery, it is possible to determine whether the discharge depth value and the temperature value are out of the limits. The calculation required is simplified, and it is determined in a short time whether or not the power storage device 1020 can be operated according to the operation profile.

5 Relationship between the number of charge / discharge cycles, the number of single cell failures, the resource matrix for discharge depth values, and the resource matrix for temperature values FIG. 4 shows the number of charge / discharge cycles, the number of single cell failures, and the depth of discharge in the power storage facility of the embodiment. 6 is a table illustrating a relationship between a resource matrix for values and a resource matrix for temperature values. FIG. 5 is a relationship diagram illustrating the relationship among the number of charge / discharge cycles, the number of unit cell failures, the discharge depth value resource matrix, and the temperature value resource matrix in the power storage facility of the embodiment.

  As shown in FIG. 4, the plurality of resource matrices 1340 includes 11 charge / discharge cycle numbers 1360, 1361, 1362, 1363, 1364, 1365, 1366, 1367, 1368, 1369 and 1370, respectively. Resource matrix groups 1380, 1381, 1382, 1383, 1384, 1385, 1386, 1387, 1388, 1389 and 1390. Each resource matrix group 1400, which is each of the resource matrix groups 1380, 1381, 1382, 1383, 1384, 1385, 1386, 1387, 1388, 1389 and 1390, Each includes four corresponding resource matrix pairs 1440, 1441, 1442 and 1443. Each resource matrix pair 1460, which is each of the resource matrix pairs 1440, 1441, 1442 and 1443, includes a resource matrix 1480 for discharge depth values and a resource matrix 1481 for temperature values. Therefore, as shown in FIG. 5, the plurality of resource matrices 1340 includes 44 discharge depths corresponding to 44 charge / discharge cycle number and cell failure number sets 1500, 1501,. .., 1522 for the 44 temperature values corresponding to 44 charge / discharge cycle number and cell failure number sets 1500, 1501,. , 1542 of the resource matrix 1540, 1541,.

  The 11 charge / discharge cycle numbers 1360, 1361, 1362, 1363, 1364, 1365, 1366, 1367, 1368, 1369 and 1370 may be replaced with 10 or less or 12 or more charge / discharge cycle numbers. The number of single cell failures 1420, 1421, 1422 and 1423 may be replaced with three or less or five or more single cell failures. Each resource matrix pair 1460 including a resource matrix 1480 for discharge depth values and a resource matrix 1481 for temperature values is replaced with one resource matrix in which the resource matrix 1480 for discharge depth values and the resource matrix 1481 for temperature values are integrated. May be.

  The parameter information 1560 consisting of a set of the number of charge / discharge cycles and the number of single cell failures may be replaced with other parameter information. Examples of other parameter information will be described later.

6 Resource Matrix FIG. 6 is a schematic diagram illustrating a resource matrix for discharge depth values stored in the power storage facility of the embodiment. FIG. 7 is a schematic diagram illustrating a resource matrix for temperature values stored in the power storage facility of the embodiment. FIG. 8 is a relationship diagram illustrating the relationship between the discharge depth value, the temperature value, the discharge depth value change, and the temperature value change in the power storage facility of the embodiment.

  Hereinafter, the charge / discharge power value is represented by the ratio of the charge / discharge power value to the rated charge / discharge power value, the ratio of the charge power value to the rated charge / discharge power value is represented by a positive value, and the rated charge / discharge power value of the discharge power value is expressed. A convention is used to express the ratio to as a negative value. Other conventions may be used.

  The discharge depth value resource matrix 1480 corresponds to 49 charge / discharge power values 1580, 1581, ..., 1582, 1583, 1584, ..., 1585, 1586 as shown in FIG. , 1602, 1603, 1604,..., 1605, 1606.

  Each of the portions 1600, 1601,..., 1602, 1603, 1604,..., 1605, 1606 has 30 discharge depth values 1640, 1641,. Each of the discharge depth value change groups 1660, 1661,..., 1662, 1663 includes 30 corresponding discharge depth value change groups 1660, 1661,. 1680 includes twelve discharge depth value changes 1720, 1721,..., 1722 respectively corresponding to twelve temperature values 1700, 1701,. Accordingly, each portion 1620 includes 360 discharge depth value changes 1760, 1761 corresponding to 360 discharge depth value and temperature value pairs 1740, 1741,..., 1742, respectively, as illustrated in FIG. , ..., 1762 are included.

  The temperature value resource matrix 1481 corresponds to 49 charge / discharge power values 1580, 1581, ..., 1582, 1583, 1584, ..., 1585, 1586, respectively, as shown in FIG. 49 parts 1780, 1781, ..., 1782, 1783, 1784, ..., 1785, 1786 are included.

  Each of the portions 1800, which are each of the portions 1780, 1781, ..., 1782, 1783, 1784, ..., 1785, 1786, has 30 discharge depth values 1640, 1641, ..., 1642, 1643, respectively. Each of the temperature value change groups 1840 including 30 temperature value change groups 1820, 1821,..., 1822, 1823 corresponding to each of the temperature value change groups 1820, 1821,. 12 temperature values 1700, 1701,..., 1702 corresponding to 12 temperature values 1700, 1701,. Accordingly, each portion 1800 includes 360 temperature value changes 1880, 1881, corresponding to 360 discharge depth value and temperature value pairs 1740, 1741, ..., 1742, respectively, as shown in FIG. ..., including 1882.

  From these, each part 1620 and each part 1800 has 360 discharge depth value changes and temperature value change corresponding to 360 discharge depth value and temperature value sets 1740, 1741, ..., 1742, respectively. A set 1900, 1901,.

  As described above, each charge / discharge power value 1580, 1581,..., 1582, 1583, 1584,. The power value indicates a discharge power value. When each charge / discharge power value takes a negative value, each charge / discharge power value indicates a charge power value. Therefore, the discharge depth value change and the temperature value change included in the portion corresponding to the charge / discharge power value taking a positive value are the discharge depth value change and the temperature value change corresponding to the discharge power value. Moreover, the discharge depth value change and the temperature value change included in the portion corresponding to the charge / discharge power value taking a negative value are the discharge depth value change and the temperature value change corresponding to the charge power value.

  The discharge depth value resource matrix 1480 is applied to the discharge depth value and temperature value pairs 1740, 1741,..., 1742 and the discharge depth value changes 1760, 1761,. When the module battery starts charging / discharging for 15 minutes with the charge / discharge power value corresponding to each portion 1620, the discharge depth indicated by the set of discharge depth values and temperature values 1740, 1741,. When the battery has a temperature, the module battery is determined to have a discharge depth value indicated by a change in discharge depth value 1760, 1761,. The depth of discharge value when charging / discharging is completed is obtained by adding a change in the depth of discharge value to the depth of discharge value when charging / discharging is started.

  The discharge depth value and temperature value sets 1740, 1741,..., 1742 and temperature value changes 1880, 1881,..., 1882 included in each portion 1800 are modules to which the resource matrix 1481 for temperature values is applied. When the battery starts charging / discharging for 15 minutes with the charging / discharging power value corresponding to each portion 1800, the discharge depth and temperature indicated by the set of discharge depth values and temperature values 1740, 1741,. If so, the module battery is determined to have a temperature value indicated by temperature value changes 1880, 1881,. The temperature value when charging / discharging is completed is obtained by adding a temperature value change to the temperature value when charging / discharging is started.

  49 charge / discharge power values 1580, 1581, ..., 1582, 1583, 1584, ..., 1585, 1586 may be replaced with 48 or less or 50 or more charge / discharge power values. 30 discharge depth values 1640, 1641, ..., 1642, 1643 may be replaced with 29 or less discharge depth values or 31 or more discharge depth values. The twelve temperature values 1700, 1701,..., 1702 may be replaced with 11 or less or 13 or more temperature values.

  The charge / discharge power value may be replaced with other charge / discharge conditions. For example, the charge / discharge power value may be replaced with a charge / discharge current value. An indicator of the state at the start of charge / discharge consisting of a combination of the depth of discharge value and the temperature value may be replaced with another indicator of the state at the start of charge / discharge. For example, an indicator of the state at the start of charge / discharge consisting of a set of the depth of discharge value and the temperature value may be replaced with an indicator of the state at the start of charge / discharge consisting of the SOC value and the temperature value. An indicator of the state at the end of charge / discharge consisting of a change in the depth of discharge value and a change in temperature value may be replaced with another indicator of the state at the end of charge / discharge. For example, a state indicator at the end of charge / discharge consisting of a change in depth of discharge value and a change in temperature value is an indicator of state at the end of charge / discharge consisting of a depth of discharge value and a temperature value, and a charge / discharge end consisting of change in SOC value and temperature value change. It may be replaced with an indicator of the state of time.

7 Selection of m number of selected module batteries m number of selected module batteries are defined as a set of discharge depth value and temperature value at the time t (1), ..., t (n) of m number of selected module batteries. The ease of detachment from the limit is greater than the ease of detachment from the above limit of the set of depth of discharge values and temperature values at time t (1), ..., t (n) of 40-m non-selected module batteries. As such, it is selected from 40 module batteries. For example, m selection modules having a large increase in the depth of discharge value under the same use conditions are referred to by referring to the operation results including the voltage value, current value, and temperature value of each module battery 1160 stored in the control device 1021 before the previous day. A battery, m selection module batteries having a large increase in temperature value under the same use conditions, m selection module batteries having a long operation history, m selection module batteries having a large number of unit cell failures, and the like are selected. The m selected module batteries are 1 to 39 module batteries that are a part of the 40 module batteries, and preferably 4 to 8 occupying 10% to 20% of the 40 module batteries. There are no more than module batteries. The 40-m non-selected module batteries are 1 to 39 module batteries that are part of the 40 module batteries but different from the m selected module batteries.

  A module battery having a large increase in the discharge depth value under the same use condition is a module battery having a large increase in the discharge depth value obtained from the discharge depth value calculated from, for example, the open-circuit voltage value during the discharge pause.

  A module battery having a large temperature value increase under the same use condition is a module battery having a high temperature value at the end of discharge, for example.

  A module battery having a long operation history is, for example, a module battery having a large number of charge / discharge cycles. As the number of charge / discharge cycles of the module battery increases, the charge recovery of the single battery provided in the module battery deteriorates, and the amount of electricity that the single battery can discharge decreases. Further, as the number of charge / discharge cycles of the module battery increases, the internal resistance of the cell provided in the module battery increases, and the temperature of the cell when the cell is charged / discharged with the same charge / discharge power. The rise is greater.

  A module battery having a large number of unit cell failures is a module battery having a large number of unit cell failures determined from, for example, an open-circuit voltage value during discharge suspension. The current and the amount of electricity that flow in a healthy non-failed cell provided in a module battery with a large number of single-cell failures are the current that flows in a healthy non-failed battery that is provided in a module battery with a small number of single-cell failures, respectively. And more than the amount of electricity. For this reason, the rise in the temperature inside the module battery having a large number of single cell failures is larger than the rise in the temperature inside the module battery having a small number of single cell failures. It becomes deeper than the discharge depth of the module battery with a small number of single cell failures.

FIG. 9 is a flowchart illustrating a flow of determination as to whether or not the power storage device can be operated in the power storage facility according to the embodiment. FIG. 10 is a graph illustrating an example of an operation profile input to the power storage facility of the embodiment.

  As illustrated in FIG. 9, the calculation mechanism 1321 obtains an operation profile 1790 illustrated in FIG. 10 in step S <b> 101.

  In step S102, the calculation mechanism 1321 selects a resource matrix 1480 for depth of discharge and a resource matrix 1481 for temperature values to be applied to each selected module battery from the plurality of resource matrices 1340.

  In step S103, the calculation mechanism 1321 obtains a set of the discharge depth value and the temperature value at time t (1) of each selected module battery from the control device 1021.

  In step S104, the computing mechanism 1321 refers to the selected resource matrix 1480 for discharge depth and the resource matrix 1481 for temperature value, and obtains the obtained operation profile 1790 and the discharge depth at time t (1) of each selected module battery. From the set of value and temperature value, the set of depth of discharge value and temperature value at time t (2),..., T (n) of each selected module battery is calculated.

  At time t (1), ..., t (n), time t (i + 1) included in time t (1), ..., t (n) is at time t (1), ... , t (n) is determined to arrive after time t (i), and preferably, time t (i + 1) is determined to arrive 15 minutes after time t (i). In addition, the times t (1),..., T (n) are determined so that the period from the time t (1) to the time t (n) includes the period from the start time to the end time of the driving profile 1790. Preferably, it is determined to coincide with the period from the start time to the end time of the driving profile 1790. n is an integer of 3 or more.

  In step S105, the determination mechanism 1322 determines whether or not the combination of the discharge depth value and the temperature value at the times t (1),..., T (n) of the m selected module batteries is out of the above-described conditions. If it is determined that the combination of the depth of discharge value and the temperature value of the m selected module batteries at time t (1),..., T (n) does not deviate from the above-described conditions, in step S106, it is obtained. It is determined that the power storage device 1020 can be operated according to the operating profile 1790, and the combination of the depth of discharge value and the temperature value at the time t (1),. If it is determined that the power storage device 1020 is out of the range, it is determined in step S107 that the power storage device 1020 cannot be operated according to the obtained operation profile 1790.

  The determination mechanism 1322 specifies the maximum values of the depth of discharge and the temperature at the time t (1),..., T (n) of the m selected module batteries, and displays the specified maximum on the monitoring device 1023. You may let them. Thereby, the operator can grasp | ascertain the driving | running tolerance or the excessive driving | running | working degree of the electric power storage apparatus 1020 with respect to the driving profile 1790, and can select a new driving profile easily. In a case where an index of a state composed of a combination of a discharge depth value and a temperature value is replaced with an index of another state, a minimum value may be specified instead of the maximum value or in addition to the maximum value. For example, when a state index composed of a set of discharge depth value and temperature value is replaced with a state index composed of a set of SOC value and temperature value, the minimum value of the SOC value and the maximum value of the temperature value are specified. Good.

  When the determination mechanism 1322 determines that the combination of the discharge depth value and the temperature value at the time t (1),..., T (n) of the m selection module batteries is out of the above-described conditions, the m selection module batteries. The set of the depth of discharge value and the temperature value at time t (1), ..., t (j) of time t (1), ..., t The time t (j) at which the combination of the depth of discharge value and the temperature value at (j + 1) deviates from the above-mentioned condition is specified, and the time t (j) -t (1) at which the power storage device 1020 can be operated is calculated. Then, the calculated time t (j) -t (1) may be displayed on the monitoring device 1023. As a result, the operator can easily select a new driving profile.

9 Selection of Resource Matrix Applied to Each Selected Module Battery FIG. 11 shows selection of a resource matrix for the depth of discharge value and a resource matrix for the temperature value applied to each selected module battery in the power storage facility of the embodiment. It is a flowchart which illustrates a flow.

  As shown in FIG. 11, the calculation mechanism 1321 obtains a set of the number of charge / discharge cycles and the number of single cell failures of each input selected module battery in step S <b> 111.

  The parameter information composed of the combination of the number of charge / discharge cycles and the number of unit cell failures may be replaced with other parameter information. For example, the number of charge / discharge cycles may be replaced with the residual electric quantity and internal resistance of the unit cell included in each selected module battery. Examples of other parameter information will be described later.

  In step S112, the calculation mechanism 1321 converts the obtained charge / discharge cycle number and unit cell failure number into a set 1500 of charge / discharge cycle number and unit cell failure number 1500, 1501,..., 1502 are selected.

  In step S113, the calculation mechanism 1321 converts the resource matrix for the depth of discharge and the resource matrix for the temperature value corresponding to the selected combination of the number of charge / discharge cycles and the number of cell failures into the resource matrices 1520 and 1521 for the depth of discharge, respectively. ,..., 1522 and a resource matrix for temperature values 1540, 1541,.

  In step S114, the calculation mechanism 1321 converts the selected discharge depth resource matrix and temperature value resource matrix into a discharge depth resource matrix and a temperature value resource matrix respectively applied to each selected module battery.

10 Calculation of set of depth of discharge value and temperature value at time t (2), ..., t (n) of each selected module battery FIG. 12 shows the time t of each selected module battery in the power storage facility of the embodiment. 6 is a flowchart illustrating the flow of calculation of a set of depth of discharge values and temperature values at (2),..., T (n).

  As shown in FIG. 12, the calculation mechanism 1321 sets the period identifier i to an initial value 1 in step S121.

  The calculation mechanism 1321 performs the i-th calculation for each selected module battery in steps S122 to S124.

  In step S122, the calculation mechanism 1321 specifies the i-th charge / discharge power value in the period from time t (i) to time t (i + 1) from the operation profile 1790. When the charge / discharge power value specified by the operation profile 1790 is a constant value during the period from time t (i) to time t (i + 1), the constant value becomes the i-th charge / discharge power value. Is done. In the period from time t (i) to time t (i + 1), when the charge / discharge power value specified by the operation profile 1790 is a fluctuation value, the root mean square (RMS) value of the fluctuation value or The average value is set to the i-th charge / discharge power value.

  In step S123, the calculation mechanism 1321 calculates the charge / discharge power value corresponding to the i-th charge / discharge power value as the charge / discharge power values 1580, 1581, ..., 1582, 1583, 1584, ..., 1585, 1586. Select from.

  In step S124, the calculation mechanism 1321 refers to the portion corresponding to the selected charge / discharge power value, and calculates the time of each selected module battery from the combination of the discharge depth value and the temperature value at time t (i) of each selected module battery. A set of the depth of discharge value and the temperature value at t (i + 1) is calculated.

  In the calculation, a set of discharge depth value and temperature value corresponding to the set of discharge depth value and temperature value at time t (i) of each selected module battery is a set of discharge depth value and temperature value 1740, 1741,. , 1742. Further, a set of discharge depth value change amount and temperature value change amount corresponding to the selected combination of discharge depth value and temperature value is a set of discharge depth value change amount and temperature value change amount 1900, 1901,. Selected from. Further, the selected discharge depth value change amount and temperature value change amount are added to the selected discharge depth value and temperature value, respectively, and new discharge depth values and temperature values are obtained, respectively.

  When the period from time t (i) to time t (i + 1) is 15 minutes, the obtained new set of discharge depth value and temperature value is the time t (i + 1) of each selected module battery. The discharge depth value and the temperature value are set to

  When the period from time t (i) to time t (i + 1) is shorter than 15 minutes, the ratio of the period from time t (i) to time t (i + 1) with respect to 15 minutes changes in the discharge depth value. Is multiplied by a new discharge depth value change, and the discharge depth value at time t (i + 1) of each selected module battery is obtained from the new discharge depth value change. When the period from time t (i) to time t (i + 1) is shorter than 15 minutes, the ratio of the period from time t (i) to time t (i + 1) with respect to 15 minutes is the temperature value. The change is multiplied to obtain a new temperature value change, and the temperature value at time t (i + 1) of each selected module battery is obtained from the new temperature value change.

  In step S125, the calculation mechanism 1321 determines whether or not the period identifier i has reached the final value n−1. If the period identifier i has reached the final value n−1, the processing mechanism ends. If i has not reached the final value n-1, the period identifier i is incremented by 1 in step S126, and step S122 is executed again. Thereby, the i-th calculation which is each of the first to n-1th calculations is performed for each selected module battery.

11 When interpolation is required The charge / discharge power values 1580, 1581, ..., 1582, 1583, 1584, ..., 1585, 1586 are discrete values. For this reason, when the depth-of-discharge value matching the i-th charge / discharge power value is included in the charge / discharge power values 1580, 1581, ..., 1582, 1583, 1584, ..., 1585, 1586, The discharge depth value corresponding to the i th charge / discharge power value is set to the discharge depth value corresponding to the i th charge / discharge power value, but the discharge depth value corresponding to the i th charge / discharge power value is the charge / discharge power value 1580, 1581,..., 1582, 1583, 1584,..., 1585, 1586, two or more adjacent charge / discharge power values sandwiching the i-th charge / discharge power value are the i-th charge / discharge power values. The charge / discharge power value corresponding to the discharge power value is set.

  Similarly, all of the discharge depth values 1640, 1641, ..., 1642, 1643 and the temperature values 1700, 1701, ..., 1702 are discrete values. Therefore, a combination of the discharge depth value and the temperature value that matches the combination of the discharge depth value and the temperature value at time t (i) is included in the discharge depth value and temperature value sets 1740, 1741,. Is a set of discharge depth values and temperature values corresponding to the set of discharge depth values and temperature values at time t (i). A set of discharge depth values and temperature values that match the set of discharge depth values and temperature values at time t (i) is a set of discharge depth values and temperature values 1740, 1741,. If not included in 1742, a set of two or more adjacent discharge depth values and temperature values sandwiching a set of discharge depth values and temperature values at time t (i) is a discharge depth value and temperature at time t (i). A discharge depth value and a temperature value corresponding to the value set are set.

  Therefore, in step S124, two or more new sets of discharge depth values and temperature values may be obtained. When two or more new sets of discharge depth values and temperature values are obtained, linear interpolation is performed on the new sets of two or more discharge depth values and temperature values, and the time of each selected module battery is determined. A set of depth of discharge values and temperature values at t (i + 1) is obtained. Instead of linear interpolation, interpolation other than linear interpolation may be performed.

12 Other types of parameter information The parameter information includes parameters necessary for determining whether or not the power storage device 1020 can be operated with necessary accuracy, and includes initial parameters input by the operator, sequential parameters input by the operator, It may include sequential measurement values measured sequentially, real-time measurement values measured in real time, and the like.

  The initial parameters input by the operator are the configuration of the power storage device 1020, the efficiency of the PCS 1141, the upper limit discharge depth value of each module battery 1160, the upper limit temperature value of each module battery 1160, the upper limit output power value of each module battery 1160, each The configuration of the module battery 1160, the resistance value of the electrical resistance added by modularization, and the like are input when the operation of the power storage device 1020 is started. The configuration of the power storage device 1020 includes the number of parallel connection of the module battery arrays 1060, 1061, 1062 and 1063 and the number of series connections of the module batteries 1120, 1121,. The configuration of each module battery 1160 includes the number of series connections of blocks 1200, 1201, 1202 and 1203, the number of parallel connections of strings 1240, 1241,..., 1242 belonging to each block 1220, and cells 1280 and 1281 belonging to each string 1260. ,..., 1282 in series. The electric resistance added by modularization includes a connection resistance and a fuse resistance. The number of parallel connections of the module battery arrays 1060, 1061, 1062, and 1063 is, for example, 4, and the number of series connections of the module batteries 1120, 1121, ..., 1122 belonging to each module battery array 1100 is, for example, 10, The efficiency of the PCS 1141 is, for example, 96%, the upper limit discharge depth value of each module battery 1160 is, for example, 775 Ah, the upper limit temperature value of each module battery 1160 is, for example, 360 ° C., and the upper limit output power value of the module battery Is, for example, 60 kW. In addition, the number of serial connections of the blocks 1200, 1201, 1202, and 1203 is four, for example, and the number of parallel connections of the strings 1240, 1241,..., 1242 belonging to each block 1220 is 12, for example. The number of serial connections of cells 1280, 1281,.

  The sequential parameters input by the operator are the heat dissipation amount of each module battery 1160, the number m of the selected module battery, the identification number of the selected module battery, etc., every six months to one year after the operation of the power storage device 1020 is started. Updated to The heat radiation amount of each module battery 1160 is, for example, 2000 W, and the number m of the selected module batteries is, for example, four.

  The sequential measurement values sequentially measured are the remaining capacity of each unit cell 1300, the internal resistance of each unit cell 1300, the number of charge / discharge cycles of each module cell 1160, the number of unit cell failures of each module cell 1160, etc. Updated every week. The residual capacity of each unit cell 1300 is, for example, 65 Ah, the internal resistance of each unit cell 1300 is, for example, 1.8 mΩ, the number of unit cell failures of each module cell 1160 is, for example, two, The number of charge / discharge cycles 1160 is, for example, 1500 cycles. Instead of the number of single cell failures, the number of failure strings may be input. The number of charge / discharge cycles may be the number of equivalent cycles.

  The real-time measurement values measured in real time are the discharge depth value, temperature value, etc. of each selected module battery, and are updated every few seconds to several minutes.

13 Advantages of the Determination Device of the Embodiment According to the determination device 1022 of the embodiment, as described above, by selecting a part of 40 module batteries and referring to the resource matrix applied to each selected module battery The calculation required for determining whether or not the combination of the discharge depth value and the temperature value of the module battery is out of the limitation is simplified, and it is determined in a short time whether or not the power storage device 1020 can be operated according to the operation profile 1790. .

  For this reason, it is determined in a short time whether or not the power storage device 1020 can be operated in accordance with the operation profile 1790 even when a change in the operation schedule required from the outside or a change in the load on the customer facility suddenly occurs. The power input / output capability of the storage device 1020 is effectively utilized.

  Although the present invention has been described in detail, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

1000 Power storage facility 1020 Power storage device 1021 Control device 1022 Judgment device 1023 Monitoring device 1120, 1121,..., 1122 Module battery 1280, 1281, 1282,. 1340 Resource matrix 1480 Resource matrix for discharge depth values 1481 Resource matrix for temperature values

Claims (5)

A lookup table applied to each selected module battery that is each of at least one selected module battery that is part of a plurality of module batteries provided in the power storage device is stored, and the lookup table includes a plurality of charge / discharge A plurality of portions each corresponding to a condition, and each of the plurality of portions includes a plurality of state indicators at the start / end of charge / discharge and a plurality of state indicators at the end of charge / discharge, When each of the selected module batteries has an indicator of the state at the start of the plurality of charging / discharging when the charging / discharging for a specific time according to the charging / discharging condition corresponding to The plurality of state indicators at the start of charging / discharging and the plurality of end times of charging / discharging so that the battery has an indicator of the state at the end of the plurality of charging / discharging states, respectively. A storage mechanism for indication of state is determined,
An operation profile that specifies a time change in input / output power of the power storage device is obtained, an index of a state of each selected module battery at a first time is obtained, and the first to n−1th order of each selected module battery is obtained. I-th charge / discharge conditions in the period from the i-th time to the (i + 1) -th time in the i-th order calculation that is each of the calculations from the first order to the (n-1) -th order. Is selected from the operating profile, a corresponding charging / discharging condition corresponding to the i th charging / discharging condition is selected from the plurality of charging / discharging conditions, and each selection module is referred to by referring to a portion corresponding to the corresponding charging / discharging condition An operation in which n is an integer greater than or equal to 3 by calculating an index of a state of each selected module battery at an (i + 1) -th time that comes after the i-th time from an index of a state at the i-th time of the battery And the structure,
Determining that the power storage device can be operated according to the operation profile when an indicator of a state of the at least one selected module battery at times 1 to n does not deviate from a restriction; A determination mechanism that determines that the power storage device cannot be operated according to the operation profile when an index of a state at the first to n-th times is out of the restriction;
A device that determines whether or not the power storage device can be operated. The storage mechanism stores a plurality of lookup tables respectively corresponding to a plurality of parameter information,
The arithmetic mechanism obtains parameter information, selects corresponding parameter information corresponding to the parameter information from the plurality of parameter information, and selects a corresponding lookup table corresponding to the corresponding parameter information from the plurality of lookup tables. The apparatus for determining whether or not the power storage device can be operated according to claim 1, wherein the corresponding lookup table is the lookup table. The ease of deviating from the restriction of the state index at the first to nth times of the at least one selected module battery is a part of the plurality of module batteries, but the at least one selected module battery The at least one selected module battery is selected from the plurality of module batteries so that the at least one different non-selected module battery is more easily removed from the restriction of the state index at the first to nth times. A device for determining whether or not the power storage device according to claim 1 or 2 is operated. The power storage according to any one of claims 1 to 3, wherein the determination mechanism specifies at least one of a maximum value and a minimum value of a state index at the first to n-th times of the at least one selected module battery. A device that determines whether or not the device can be operated. The determination mechanism is configured such that the state index of the at least one selected module battery does not deviate from the restriction but the state of the at least one selected module battery at the time from the first to the j + 1th time. 5. The time from the first time to the j-th time, which is the time during which the power storage device can be operated, is calculated by specifying the j-th time such that the index of the value deviates from the limit. A device that determines whether or not the power storage device can be operated.

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