JP2019110712A - Power storage system - Google Patents

Abstract

To provide a power storage system capable of reducing a temperature rise of a battery with a simple device configuration.SOLUTION: A power storage system (100) includes a first battery (101) and a second battery (102), in which a heat adsorption determination portion (105) is provided for instructing a power controller (104) so as to input and output a DC power to/from the second battery, via the power controller, determine the presence or absence of an endothermic reaction in the first battery, and limit the DC power to be input to or output from the second battery, if there is the endothermic reaction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a storage system having a function of cooling a battery.

  In recent years, a battery system incorporating a large number of batteries, such as a mobile storage device, a grid connection stabilization storage device, and an emergency storage device, has attracted attention. These battery systems are required to have a large battery capacity, which is an amount of energy that can be stored in the battery, and a large battery output, which is the maximum energy that can be instantaneously output from the battery.

  The battery output is limited to the maximum and minimum voltage that the battery can output, and the maximum temperature that the component can tolerate. Since these constraints depend on the material of the battery system, it is difficult to alleviate the constraints. Therefore, it has been studied along with the development of materials to reduce the amount of voltage fluctuation and the amount of temperature rise due to the battery output, and make it difficult to violate constraints. In particular, the amount of temperature rise tends to be a problem because the battery temperature rises as the battery is used.

  On the other hand, the technique of patent document 1 is known as a prior art for lowering | hanging battery temperature. In the present technology, when the temperature of the main battery rises, the auxiliary battery having a low internal resistance is switched to cool the main battery by the heat absorption effect of the auxiliary battery.

Unexamined-Japanese-Patent No. 2010-22151

  In the above-mentioned prior art, although the amount of temperature rise of the battery can be reduced, the size and the number of parts of the battery system increase.

  Therefore, the present invention provides a storage system capable of reducing the temperature rise of the battery with a simple device configuration.

  In order to solve the above problems, a storage system according to the present invention includes a first battery and a second battery to which DC power is input / output, and the second battery is connected to DC power via a power controller. To the power controller to determine the presence or absence of the endothermic reaction in the first battery, and to limit the DC power input / output to the second battery when there is an endothermic reaction. It has an endothermic judgment unit to command.

  According to the present invention, the temperature rise of the battery can be efficiently reduced.

  Problems, configurations, and effects other than those described above will be clarified by the description of the embodiments below.

1 shows a basic configuration of a composite power storage system according to a first embodiment. The structure of the heat absorption determination part in Embodiment 1, and an optimal electric current estimation part is shown. An example of the relationship between unit heat of reaction and SOC is shown. The structure of the heat absorption determination part in Embodiment 2, and an optimal electric current estimation part is shown. The basic composition of the compound electricity storage system which is Embodiment 3 is shown. The structure of the heat absorption determination part in Embodiment 4 is shown.

Hereinafter, Embodiments 1 to 4 of the present invention will be described using the drawings. In the drawings, those with the same reference numerals indicate components having the same configuration or similar functions.
(Embodiment 1)
FIG. 1 shows a basic configuration of a composite power storage system that is Embodiment 1 of the present invention.

  As shown in FIG. 1, the composite power storage system 100 is a power type comprising a capacitive battery group 101 consisting of one or a plurality of capacitive batteries having a large battery capacity, and one or a plurality of power batteries having a large battery output. A battery group 102 is provided. In the figure, in each battery group, a plurality of batteries are connected in series, but the number of series may be arbitrary. Also, a plurality of batteries may be connected in series and in parallel. In combined storage system 100, power type battery group 102 is connected in parallel to capacitive type battery group 101 via DC / DC converter 104 which is a power controller. As described later, the DC / DC converter 104 is controlled in accordance with the respective outputs of the heat absorption determination unit 105 and the optimum current estimation unit 106.

  Composite power storage system 100 is connected to the DC side of inverter 103. That is, capacitive battery group 101 is directly connected to inverter 103 without a power controller such as a DC / DC converter, and power battery group 102 is connected to inverter 103 via DC / DC converter 104. Ru. As a result, the DC power output from the composite power storage system 100, that is, the capacitive battery group 101 and the power battery group 102 is supplied to the inverter 103.

  Direct-current power is output from the capacitive battery group 101 directly to the inverter 103 via the DC / DC converter 104 from the power battery group 102. The inverter 103 converts DC power supplied from the capacitive battery group 101 and the power battery group 102 into AC power of an appropriate voltage or current. The load 107 is driven by the AC power output from the inverter 103. The DC / DC converter 104 steps up or down the voltage of the power type battery group 102 to the operating voltage of the inverter 103 or the load 107.

  In addition, the inverter 103 operates as a forward converter to convert AC power (for example, regenerative power) from the load 107 into DC power of an appropriate voltage or current, thereby enabling the capacity type battery group 101 and the power type battery. Output to the group 102. The capacity type battery group 101 and the power type battery group 102 are charged by this DC power. The DC / DC converter 104 steps up or down the DC voltage output from the inverter 103 to a voltage suitable for the power type battery group 102.

  The DC / DC converter 104 may use a bidirectional one, or may use a boost type or a buck type in one direction (direction from the power type battery group 102 to the inverter 103 side). . A known chopper circuit can be used as a circuit configuration of the bidirectional DC DC converter, the one-way step-up DC DC converter, and the one-way step-down DC DC converter.

  The inverter 103 includes a known main circuit formed of a bridge circuit of a plurality of semiconductor switching elements (for example, IGBTs and MOSFETs). By turning on and off the plurality of semiconductor switching elements, power conversion between DC power and AC power is performed.

  The load 107 is, for example, an induction machine or a synchronous machine.

  By the operation of the composite power storage system 100 and the inverter 103 as described above, the power charged in each battery group can be supplied to the load with the electrical specification suitable for the load 107, and the surplus power and load generated in the load 107 are generated. Power can be charged to each battery group.

  Here, the capacity type battery group 101 has a larger battery capacity than the power type battery group 102, and can charge and discharge for a long time. When the capacity type battery group 101 is responsible for steady charging and discharging with respect to the load, the load can be operated for a long time. A lithium ion battery, a lithium ion semi-solid battery, a lithium solid battery, a lead battery, a nickel zinc battery or the like is applied as a capacity type battery constituting such a capacity type battery group 101.

  Further, the power type battery group 102 has a smaller internal resistance (DCR) of the battery than the capacitive type battery group 101, and can charge and discharge large power. Even in the case of charging and discharging a large amount of power, the power type battery group 102 has a small amount of heat generation, and therefore the temperature hardly rises. Therefore, the temperature increase of the capacitive battery group 101 can be prevented by mainly using the power battery group 102 at the time of charge and discharge of a large current. As a power type battery which comprises such a power type battery group 102, a lithium ion battery, a nickel hydrogen battery etc. are applied, for example. Further, instead of the power type battery, a power storage device (in other words, a power type power storage device) such as a lithium ion capacitor or an electric double layer capacitor having high output characteristics similar to this may be used. Hereinafter, these batteries and capacitors are collectively referred to as "power type batteries".

  The lithium ion battery used as a capacity type battery and the lithium ion battery used as a power type battery are different in configuration such as electrode material.

  FIG. 2 shows the configurations of the heat absorption determination unit 105 and the optimum current estimation unit 106.

  Hereinafter, the heat absorption determination unit 105 and the optimum current estimation unit 106 will be sequentially described using FIG. 2 as appropriate.

  The endothermic determination unit 105 determines the presence or absence of the endothermic reaction in the capacitive battery group 101, and limits the power input / output to / from the power type battery group 102 to the DC / DC converter 104 when the endothermic reaction occurs. Output a command signal (power limit signal).

  The amount of heat of reaction (exothermic reaction if positive, endothermic reaction if negative) generated with charging and discharging of the battery is proportional to the amount of current flowing through the battery, and the slope of the change of the heat of reaction to the current The unit heat of reaction (referred to as “unit reaction heat”) differs depending on the type of reaction that occurs with charge and discharge. Since the type of this reaction differs depending on the open circuit voltage (OCV) of the battery, once the OCV is determined, the unit reaction heat is also determined. Then, from the unit reaction heat and the current, the amount of reaction heat can be determined using equation (1).

Heat of reaction = unit heat of reaction × current (1)
Since heat is generated if such reaction heat is positive, and heat absorption if negative, the heat absorption determination unit 105 determines the presence or absence of the endothermic reaction from the sign (positive or negative) of the reaction heat, and outputs a power limiting signal.

  In the first embodiment, the heat absorption determination unit 105 determines whether the reaction heat is positive or negative based on sign information of unit reaction heat and current in the capacitive battery group 101. The heat absorption determination unit 105 includes a heat absorption presence / absence database 201 in which code information of unit reaction heat is accumulated. The endothermic presence / absence database 201 stores data indicating the correspondence between the state of charge (SOC) and the positive or negative sign of the unit reaction heat for the capacitive battery group 101. The sign of the current is such that the output current from the capacitive battery group 101, that is, the discharge current is positive, and the input current to the capacitive battery group 101, that is, the charging current is negative.

  As described above, when OCV is determined, unit reaction heat is also determined, but since SOC and OCV have a bijective relationship (one-to-one relationship), unit reaction heat is also determined when SOC is determined. The situation is shown in FIG.

  FIG. 3 shows an example of the relationship between unit heat of reaction and SOC. As shown in FIG. 3, the unit heat of reaction changes in magnitude and sign with respect to SOC. In the first embodiment, the code information of unit heat of reaction is extracted from the relationship between unit heat of reaction and SOC as shown in FIG. 3, and data indicating the correspondence between the positive and negative signs of unit heat of extract and SOC is It is stored in the endothermic presence / absence database 201.

  The code determination unit 204 in the heat absorption determination unit 105 shown in FIG. 2 inputs the code of unit reaction heat from the heat absorption presence / absence database 201 according to the SOC of the capacitive battery group 101 at the time of determination execution. Further, the code determination unit 204 inputs a current and determines whether the current is positive or negative. The sign determination unit 204 determines whether the reaction heat is positive or negative, that is, the presence or absence of an endothermic reaction, based on the relationship of equation (1) from the positive and negative of the unit reaction heat and the current. The code determination unit 204 outputs the determination result as to the presence or absence of the endothermic reaction as a power limit signal.

  The heat absorption determination unit 105 may calculate the reaction heat from the unit reaction heat and the current as shown in FIG. 3 according to the equation (1) to determine whether the calculated reaction heat is positive or negative. In this case, the endothermic presence / absence database 201 stores data indicating the relationship between the unit reaction heat and the SOC as shown in FIG. 3. On the other hand, in the first embodiment, since the code information of the unit reaction heat is accumulated in the heat absorption presence / absence database 201, the data amount of the heat absorption presence / absence database 201 can be reduced.

  The charge / discharge current flowing through the capacitive battery group 101 is detected by a known means (not shown) such as a current transformer (CT) or a shunt resistor. In addition, the SOC is measured based on a known measuring unit (not shown), for example, an integrated amount of charge and discharge current.

  In the DC / DC converter 104, the endothermic reaction occurs in the capacitive battery group 101 by the endothermic judgment unit 105 according to the power limiting signal output by the endothermic judgment unit 105, that is, the judgment result of the presence or absence of the endothermic reaction in the capacitive battery group 101. If it is determined, the power input / output to / from the power type battery group 102 is limited. Further, the DC / DC converter 104 does not limit the power input / output to / from the power type battery group 102 when the heat absorption determination unit 105 does not determine that the endothermic reaction occurs in the capacitive battery group 101.

  When limiting the power input / output to / from the power type battery group 102, the DC / DC converter 104 outputs the optimum current value of the capacity type battery group 101 that the optimum current estimation unit 106 outputs the current flowing in the capacity type battery group 101; That is, control is performed so as to be equal to the current command value.

  As shown in FIG. 2, the optimal current estimation unit 106 is configured to optimize the capacity type battery group 101 based on the unit reaction heat according to the SOC of the capacity type battery group 101 and the direct current resistance (DCR) of the capacity type battery group 101. Calculate the current value. The optimum current estimation unit 106 includes a reaction heat database 202 in which data of unit reaction heat of the capacitive battery group 101 is stored. The heat absorption presence / absence database 201 stores data (see FIG. 3) indicating the relationship between the SOC and the unit reaction heat for the capacitive battery group 101.

  The optimum current calculation unit 203 in the optimum current estimation unit 106 shown in FIG. 2 inputs the value of unit reaction heat from the reaction heat database 202 according to the SOC of the capacitive battery group 101 group at the time of execution of calculation. Furthermore, based on the value of unit reaction heat to be input and the value of DCR, the optimum current calculation unit 203 uses the equation (3) described later to determine the optimum current at which the heat absorption amount of the capacitive battery group 101 group becomes maximum. Calculate The optimum current calculation unit 203 outputs the calculated optimum current to the DC / DC converter 104 as a current command value.

  The heat absorption amount by the endothermic reaction in the capacitive battery group 101 is proportional to the current as shown in the equation (1). In addition, when current flows in the capacitive battery group 101, DCR generates heat proportional to the square of the current. Therefore, the magnitude of the net heat absorption amount of the capacitive battery group 101 is expressed by Equation (2).

Heat absorption = unit heat of reaction × current-DCR × current × current (2)
The equation (2) is a quadratic equation relating to the "current", and since DCR is always positive, there is a maximum value of the amount of heat absorption. The current value when the magnitude of the heat absorption amount is maximum, ie, the optimum current, is obtained from the equation (2), and is expressed by the equation (3).

Optimal current = unit heat of reaction / (-2DCR) ... (3)
The SOC input to the optimum current estimation unit 106 is the same as the SOC input to the heat absorption determination unit 105, and is measured based on known measurement means, for example, the integrated amount of charge and discharge current. It is set in the optimum current calculation unit 203.

  The DCR is stored in advance in the optimum current estimation unit 106. For example, a measured value, a value obtained by multiplying an initial value (for example, a value at the time of battery shipment) by a rate of increase of DCR, or the like is set. Further, when the DCR changes according to the parameters such as the SOC and the energization time, data indicating the relationship between the DCR and the parameters is stored in the optimum current estimation unit 106. The optimum current calculation unit 203 uses this data to input DCR corresponding to the value of the parameter at the time of optimum current calculation. It is to be noted that, at the time of the optimum current calculation, even if the change (ΔI) and the change (ΔV) of the current of the capacitive battery group 101 are measured and the DCR is calculated based on the rate of change of voltage (ΔV / ΔI) to the current. good.

  The reaction heat database 202 may store data indicating the relationship between the SOC and a parameter having a bijective relationship, for example, an OCV and unit reaction heat. In this case, the OCV is measured, and the optimum current calculation unit 203 inputs the value of the unit heat of reaction from the reaction heat database 202 according to the OCV of the capacitive battery group 101 group at the time of execution of the calculation. The OCV detects, for example, the current and voltage of the capacitive battery group 101, and is measured based on the detected value of the voltage when the current is zero.

  The optimal current estimation unit 106 as described above can flow an optimal current that maximizes the heat absorption amount of the capacitive battery group 101 to the capacitive battery group 101 based on the SOC of the capacitive battery group 101 and the like.

As described above, according to the first embodiment, in the composite power storage system 100 in which the capacitive battery group 101 and the power battery group 102 are used in combination, when the capacitive battery group 101 causes the endothermic reaction, the power is obtained. Of the total input / output power of the complex storage system, the current flowing to the capacitive battery group 101 is increased by limiting the input / output power of the group battery 102 by the DC / DC converter 104 to Increase the ratio of input and output power. As a result, even if a cooling structure is not added, that is, the amount of temperature rise of the capacitive battery group 101 can be effectively reduced, and desired battery input / output can be maintained for a long time as a composite power storage system. Further, by controlling the current of the capacitive battery group 101 based on DCR and unit reaction heat, the cooling effect of the capacitive battery group 101 can be optimized.
Second Embodiment
The second embodiment of the present invention will be described below. The differences from the first embodiment will be mainly described.

  FIG. 4 shows a configuration of a heat absorption determination unit and an optimum current estimation unit in a composite power storage system according to a second embodiment of the present invention. The other configuration is the same as that of the first embodiment.

  As shown in FIG. 4, in the second embodiment, in the heat absorption determination unit 105 and the optimum current estimation unit 106, the same database is used unlike the first embodiment.

  Similar to the first embodiment, the optimum current estimation unit 106 has a reaction heat database 202. As in the first embodiment, the optimum current calculation unit 203 receives the unit reaction heat value from the reaction heat database 202 according to the SOC of the capacitive battery group 101 group, and inputs the value of the unit reaction heat to be input and the DCR value. Based on the value, the optimum current at which the heat absorption amount of the capacitive battery group 101 group becomes maximum is calculated using the above-mentioned equation (3).

  On the other hand, the code determination unit 205 receives the same unit reaction heat data from the reaction heat database 202 included in the optimum current estimation unit 106, and inputs the unit reaction heat data and the current of the capacitive battery group 101 group. The reaction heat is calculated by the above-mentioned equation (1), and the positive or negative of the calculated reaction heat is determined.

According to the second embodiment, the heat absorption determination unit 105 and the optimum current estimation unit 106 share the reaction heat database 202, whereby the size of the database included in the combined storage system can be reduced.
(Embodiment 3)
The third embodiment of the present invention will be described below. The differences from the first embodiment will be mainly described.

  FIG. 5 shows a basic configuration of a composite power storage system according to a third embodiment of the present invention.

  As shown in FIG. 5, in the third embodiment, as a power controller for controlling the input / output power of the power type battery group 102, a simple alternative to the DC / DC converter 104 in the first embodiment (FIG. 1). It is a switch means, and a relay 110 which operates to open and close (on / off) is used. The relay 110 is opened and closed by a command signal output from the heat absorption determination unit 105.

  The relay 110 may be an electromagnetic relay that drives a movable contact by an electromagnet, or an electronic relay in which a semiconductor switching element is used. Further, as another switch means of the relay 110, an electromagnetic contactor (contactor) or the like may be applied.

  In the third embodiment, the heat absorption determination unit 105 opens the relay 110 when it is determined that the endothermic reaction occurs in the capacitive battery group 101 by the same means as in the first embodiment or the second embodiment. Further, when the heat absorption determination unit 105 determines that the endothermic reaction does not occur in the capacitive battery group 101, the relay 110 is closed. As a result, when the endothermic reaction occurs in the capacitive battery group 101, the entire current in the composite power storage system flows to the capacitive battery group 101, so the amount of temperature increase of the capacitive battery group 101 can be effectively reduced. The desired battery input / output can be maintained for a long time.

Furthermore, according to the third embodiment, since the relay 110 is used as a power controller that controls input / output power of the power type battery group 102, the device configuration of the composite power storage system 100 can be simplified.
Embodiment 4
The fourth embodiment of the present invention will be described below. The differences from the first embodiment will be mainly described.

  FIG. 6 shows a configuration of a heat absorption determination unit in a composite power storage system according to a fourth embodiment of the present invention. The other configuration is the same as that of the first embodiment.

  In the fourth embodiment, unlike the first embodiment (FIG. 2), the heat absorption determination unit 105 determines the presence or absence of the endothermic reaction based on the temperature of the capacitive battery group as described below.

  First, when there is no heat absorption reaction, the battery temperature rise amount is formula (4) from the battery DCR, the current flowing through the battery, the time during which the current flows, the amount of heat released from the battery surface to the outside, and the battery heat capacity. Calculated by

Battery temperature rise amount = (current × current × DCR × time−heat radiation amount) / heat capacity (4)
On the other hand, when there is an endothermic reaction, the amount of temperature rise of the battery also depends on the amount of endothermic heat, so the value becomes different from that of the equation (4). Therefore, the heat-releasing amount can be estimated by comparing the predicted value of the temperature rise of the battery without the endothermic reaction calculated by the equation (4) with the actual measurement of the temperature rise of the battery. The presence or absence of the endothermic reaction can be determined by the sign of the estimated endothermic amount.

  Therefore, as shown in FIG. 6, the heat absorption determination unit 105 in the fourth embodiment includes a temperature prediction unit 301, a temperature sensor 302, and a temperature comparison / determination unit 303.

  The temperature prediction unit 301 calculates the predicted value of the temperature rise amount of the capacitive battery group 101 when there is no heat absorption reaction from the current and DCR in the capacitive battery group 101 using the above equation (4). , Output the calculated predicted value. Here, the current flowing through the capacitive battery group 101 is measured in a predetermined period when the current flows through the capacitive battery group 101 in accordance with the load and the operation of the inverter. The time value of the predetermined period is set in advance in the heat absorption determination unit 105, and is used as the value of time in Expression (4).

  The temperature sensor 302 measures the temperature of the capacitive battery group 101 and outputs an actual measurement value. Note that, as the temperature sensor 302, a known temperature sensor such as a thermocouple or a thermistor is applied.

  The temperature comparison / determination unit 303 inputs the predicted value of the temperature rise amount and the actual temperature measurement value from the temperature prediction unit 301 and the temperature sensor 302, respectively. The temperature comparison / determination unit 303 measures the amount of temperature increase from the measured value of the temperature in the above-described predetermined period for measuring the current. For example, the difference between the measured temperature values at the start and end of the predetermined period is calculated, and this difference is used as the measured value of the temperature rise amount.

  The temperature comparison / determination unit 303 determines the presence or absence of the endothermic reaction by comparing the predicted value of the temperature rise amount with the actual measurement value. Here, the endothermic determination unit 105 determines that the endothermic reaction is occurring when the measured value of the temperature rise is smaller than the predicted value, and the endothermic when the measured value of the temperature rise is equal to or greater than the predicted value. Determine that no reaction has occurred.

According to the fourth embodiment, the presence or absence of the endothermic reaction is determined based on the amount of temperature rise of the capacitive battery group 101, so the reliability of the determination of the presence or absence of the endothermic reaction is improved as described above. Instead of comparing the measured value and the predicted value, the measured value and the predicted value of the temperature may be compared. In this case, a temperature prediction value is calculated by adding the actual temperature measurement value at the start of the above-described predetermined period for measuring the current and the above prediction value of the temperature rise amount. Then, the temperature measurement value at the end of the predetermined period is compared with the temperature prediction value, and if the temperature measurement value is lower than the temperature prediction value, it is determined that an endothermic reaction has occurred, and the temperature measurement value is temperature prediction If it is above the value, it is determined that an endothermic reaction has not occurred.

  The present invention is not limited to the embodiment described above, and includes various modifications. For example, the embodiments described above are described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. In addition, it is possible to add, delete, and replace another configuration for part of the configuration of each embodiment.

  For example, the embodiment of the present invention may be applied to a conventional power storage system provided with a cooling structure. In this case, the cooling structure can be made smaller than before.

100 ... combined storage system 101 ... capacity type battery group 102 ... power type battery group,
103 ... inverter 104 ... DC / DC converter 105 ... heat absorption determination unit,
106 optimum current estimation unit 107 load 110 relay 201 heat absorption presence / absence database 202 reaction heat database 203 optimum current calculation unit 204 sign determination unit 205 sign determination unit 301 temperature prediction unit 302 temperature sensor 303 temperature Comparison / determination unit

Claims (13)

A storage system comprising a first battery and a second battery to which DC power is input / output, wherein said DC power is input to or output from the second battery via a power controller,
An endothermic determination unit that determines the presence or absence of an endothermic reaction in the first battery, and instructs the power controller to limit the DC power input to or output from the second battery if the endothermic reaction is present An electricity storage system comprising: In the power storage system according to claim 1,
The endothermic determination unit determines the presence or absence of the endothermic reaction based on a charging rate or an open voltage of the first battery and a current flowing to the first battery. In the power storage system according to claim 2,
The heat absorption determination unit determines whether the heat of reaction in the first battery is positive or negative based on the charging rate or the open circuit voltage of the first battery and the current flowing to the first battery, A storage system characterized in that the presence or absence of the endothermic reaction is determined based on whether the reaction heat is positive or negative. In the storage system according to claim 3,
The endothermic determination unit determines the first battery based on whether the unit reaction heat is positive or negative according to the charging rate of the first battery or the open circuit voltage, and whether the current flowing to the first battery is positive or negative. A storage system characterized by determining the positive and negative of the reaction heat in. In the storage system according to claim 3,
The heat absorption determination unit determines the heat of reaction in the first battery based on a unit reaction heat according to the charging rate or the open circuit voltage of the first battery and the current flowing to the first battery. A storage system characterized by calculating and determining whether the calculated reaction heat is positive or negative. In the storage system according to claim 1, further,
The current command to the power controller is set to maximize the current flowing through the first battery based on the charging rate or open circuit voltage of the first battery and the direct current resistance of the first battery. A storage system characterized by comprising an optimum current calculation unit for outputting. In the power storage system according to claim 1,
A power storage system characterized in that the power controller is a DC / DC converter. In the power storage system according to claim 1,
A storage system characterized in that the power controller is a switch means. In the power storage system according to claim 8,
The storage system characterized in that the switch means is any one of an electromagnetic relay, an electronic relay, and an electromagnetic contactor. In the power storage system according to claim 1,
The heat absorption determination unit determines the presence or absence of the endothermic reaction based on the temperature of the first battery measured by a temperature sensor, the current flowing to the first battery, and the direct current resistance of the first battery. A storage system characterized by determining. In the power storage system according to claim 10,
The heat absorption determination unit measures the temperature rise amount of the first battery based on the temperature of the first battery, and measures the current flowing through the first battery and the direct current resistance of the first battery. The presence or absence of the endothermic reaction is estimated by predicting the temperature rise of the first battery based on the above and comparing the measured temperature rise of the first battery with the predicted temperature rise of the first battery. A storage system characterized by determining. In the power storage system according to claim 1,
A storage system characterized in that the first battery is a capacitive battery, and the second battery is a power battery. In the power storage system according to claim 12,
The said capacity type battery is any one among a lithium ion battery, a lithium ion semi-solid battery, a lithium solid battery, a lead battery, and a nickel zinc battery,
A power storage system characterized in that the power type battery is any one of a lithium ion battery, a nickel hydrogen battery, a lithium ion capacitor, and an electric double layer capacitor.

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