JP2015056354A - Secondary battery system, control device, control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve the elimination of large starting current, cooling of a secondary battery required to be cooled, and no consumption of unnecessary power when cooling a secondary battery module.SOLUTION: When at least one temperature of secondary battery modules 110-1 to 110-N exceeds a temperature threshold of the secondary battery modules 110-1 to 110-N, a cooling control unit activates cooling fans 120-1 to 120-N which cool the secondary battery modules 110-1 to 110-N in which the temperature thereof exceeds the temperature threshold from among the plurality of cooling fans 120-1 to 120-N.

Description

  The present invention relates to a secondary battery system, a control device, a control method, and a program.

  When a secondary battery such as a lithium ion secondary battery rises in temperature by repeating charge and discharge and exceeds a predetermined temperature, the secondary battery deteriorates. Therefore, a technique for cooling the secondary battery has been developed. Patent Document 1 discloses a technique for measuring the temperature of a secondary battery including a plurality of cells and operating a cooling fan when the temperature exceeds a predetermined threshold.

JP 2007-141558 A

  In the secondary battery module in which a plurality of cells of the secondary battery are assembled, a cooling fan is provided for each secondary battery module in order to cool the plurality of cells. When the secondary battery is cooled using the technique disclosed in Patent Document 1, since there are a plurality of cooling fans, when the temperature exceeds a predetermined threshold value, they are started simultaneously, and a plurality of modules are simultaneously activated. Cooling. Therefore, the cooling fan not only consumes unnecessary power by cooling modules that do not require cooling, but also increases the inrush current when multiple cooling fans start up at the same time, so the secondary battery system There is a risk that the burden on

  An object of the present invention is to provide a secondary battery system, a control device, a control method, and a program that do not consume unnecessary power when the secondary battery is cooled.

  According to a first aspect, a plurality of secondary battery modules, a plurality of cooling units that respectively cool at least one of the secondary battery modules, and a temperature of the secondary battery module are acquired, and at least the secondary battery modules Cooling control that activates a cooling unit that individually cools the secondary battery module having a temperature exceeding the temperature threshold among the plurality of cooling units when one temperature exceeds a temperature threshold of the secondary battery module And a secondary battery system.

  Moreover, a 2nd aspect WHEREIN: The threshold value change part which changes the said temperature threshold value of each said secondary battery module based on the deterioration rate value calculated with respect to each said secondary battery module in a 1st aspect. It is a secondary battery system characterized by comprising.

  Moreover, a 3rd aspect is a 2nd aspect. WHEREIN: When the value which concerns on the degree of the at least 1 said deterioration of the said secondary battery module exceeds the 1st threshold value, the said threshold value change part concerned It is a secondary battery system characterized by lowering the temperature threshold of a battery module.

  According to a fourth aspect, in the second or third aspect, the threshold value changing unit has a first deterioration rate value that is at least one of the deterioration rate values of the secondary battery module. In the secondary battery system, the temperature threshold corresponding to the secondary battery module is lowered when the battery is larger than a second deterioration rate value that is the deterioration rate value of the battery by a second threshold or more.

  Moreover, a 5th aspect is provided with the deterioration model memory | storage part which memorize | stores the deterioration model which is the information which linked | related the charging / discharging cycle number of the secondary battery module and the deterioration rate value in the 3rd aspect, The said threshold value change part Acquires a deterioration rate value based on the deterioration model stored in the deterioration model storage unit and the number of charge / discharge cycles of the secondary battery module, and sets a value larger than the deterioration rate value by a predetermined value to the first It is a secondary battery system characterized by setting it as a threshold value.

  Moreover, a 6th aspect is a control apparatus which controls a secondary battery system provided with the some cooling part which each cools a some secondary battery module and at least 1 said secondary battery module, Comprising: Said secondary battery A temperature of the module is acquired, and when at least one temperature of the secondary battery module exceeds a temperature threshold of the secondary battery module, a secondary of which the temperature exceeds the temperature threshold among the plurality of cooling units. A control device comprising a cooling control unit for individually starting a cooling unit for cooling a battery module.

  Further, a seventh aspect is a control method for controlling a secondary battery system including a plurality of secondary battery modules and a plurality of cooling units that respectively cool at least one secondary battery module, and the control device includes: Obtaining a temperature of the secondary battery module; determining whether at least one temperature of the secondary battery module exceeds a temperature threshold value of the secondary battery module; and When it is determined that at least one temperature of the secondary battery module has exceeded the temperature threshold value of the secondary battery module, among the plurality of cooling units, the cooling unit that cools the secondary battery module whose temperature has exceeded the temperature threshold value And a step of individually starting the control method.

  Further, in the eighth aspect, the computer acquires the temperature of the plurality of secondary battery modules, and at least 1 when the temperature of the at least one secondary battery module exceeds the temperature threshold of the secondary battery module. This is a program for functioning as a cooling control unit that individually activates a cooling unit that cools a secondary battery module whose temperature exceeds the temperature threshold among a plurality of cooling units that respectively cool the two secondary battery modules. .

  According to at least one of the above aspects, an effect of not consuming unnecessary power when cooling the secondary battery module can be achieved.

It is a figure which shows the external appearance of the secondary battery system which concerns on at least 1 embodiment. It is a schematic block diagram which shows the structure of the secondary battery system which concerns on at least 1 embodiment. It is a flowchart which shows the control operation of the cooling fan which concerns on at least 1 embodiment. It is a schematic block diagram which shows the structure of the secondary battery system which concerns on at least 1 embodiment. It is a flowchart which shows the change operation | movement of the temperature threshold value which concerns on at least 1 embodiment. It is a schematic block diagram which shows the structure of the secondary battery system which concerns on at least 1 embodiment. It is a flowchart which shows the change operation | movement of the temperature threshold value which concerns on at least 1 embodiment. It is a schematic block diagram which shows the structure of the secondary battery system which concerns on at least 1 embodiment. It is a schematic block diagram which shows the structure of the secondary battery system which concerns on at least 1 embodiment. It is a schematic block diagram which shows the structure of the computer which concerns on at least 1 embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings.
<< First Embodiment >>
FIG. 1 is a diagram illustrating an appearance of a secondary battery system 100 according to at least one embodiment.
The secondary battery system 100 includes a plurality of secondary battery modules 110-1 to 110-N and a plurality of cooling fans 120-1 to 120-N that cool the secondary battery modules 110-1 to 100-N. . Here, hereinafter, the secondary battery modules 110-1 to 110-N will be simply referred to as the secondary battery module 110. Hereinafter, the cooling fans 120-1 to 120-N will be simply referred to as the cooling fan 120 when collectively referred to. In the present embodiment, the cooling fan 120 is an example of a cooling unit.

Each secondary battery module 110 includes a plurality of battery cells 111-1 to 111 -M. Here, hereinafter, the battery cells 111-1 to 111 -M will be simply referred to as the battery cell 111. The battery cell 111 is a secondary battery such as a lithium ion secondary battery. The battery cell 111 according to the present embodiment is not particularly limited, such as a lead secondary battery and a nickel hydride secondary battery, in addition to the lithium secondary battery, but is a lithium ion secondary battery because of good charge / discharge followability. It is preferable.
One cooling fan 120 is provided to face one secondary battery module 110 and cools the secondary battery module 110. That is, the cooling fan 120 cools the plurality of battery cells 111 included in the secondary battery module 110.

  Note that a plurality of battery cells 111 provided in the secondary battery module 110 are not necessarily provided, and the secondary battery module 110 may include one battery cell 111. That is, the cooling fan 120 cools at least one battery cell 111.

FIG. 2 is a schematic block diagram showing a configuration of the secondary battery system 100 according to at least one embodiment. In FIG. 2, a solid line indicates a power line, and a broken line indicates a data line.
The secondary battery system 100 includes a plurality of secondary battery modules 110, a plurality of cooling fans 120 that cool the secondary battery modules 110, and a battery management device 130 (BMU) that controls the secondary battery modules 110 and the cooling fans 120. : Battery Management Unit). In the present embodiment, the battery management device 130 is an example of a control device.

Each secondary battery module 110 includes a plurality of battery cells 111 and a cell monitoring unit 112 (CMU: Cell Monitor Unit).
The cell monitoring device 112 detects the temperature of the secondary battery module 110. The temperature sensor for detecting the temperature of the secondary battery module 110 is preferably installed at a position where the temperature of each battery cell 111 in the secondary battery module 110 can be acquired. As the representative temperature of the secondary battery module 110, for example, the temperature of the battery cell 111 near the center of the secondary battery module 110 may be acquired, or an average value or maximum temperature may be obtained from the temperatures of the plurality of battery cells 111. You may get it. Then, the detected temperature is transmitted to the battery management device 130.

The battery management apparatus 130 includes a module communication unit 131, a threshold storage unit 132, and a cooling control unit 133.
The module communication unit 131 receives the temperature of the secondary battery module 110 from the cell monitoring device 112 of each secondary battery module 110.
The threshold storage unit 132 stores, for each secondary battery module 110, a temperature threshold used for determining whether or not to cool the secondary battery module 110. Note that the temperature threshold value may be different for each secondary battery module 110.
The cooling control unit 133 controls the cooling fan 120 based on the temperature of the secondary battery module 110 received by the module communication unit 131 and the temperature threshold stored in the threshold storage unit 132.

FIG. 3 is a flowchart showing a control operation of the cooling fan 120 according to at least one embodiment.
When the operation of the secondary battery system 100 is started, the cell monitoring device 112 of each secondary battery module 110 starts detecting the temperature of the secondary battery module 110, and sequentially detects the detected temperature as the battery management device 130. Send to.
The module communication unit 131 of the battery management device 130 receives the temperature of the secondary battery module 110 from the cell monitoring device 112 of each secondary battery module 110 (step S201). Next, the cooling control unit 133 selects the secondary battery modules 110 one by one, and performs the following steps S203 to S208 for each secondary battery module 110 (step S202).

  First, the cooling control unit 133 reads the temperature threshold value of the secondary battery module 110 selected in step S202 from the threshold value storage unit 132 (step S203). Next, the cooling control unit 133 determines whether or not the temperature received from the secondary battery module 110 selected by the module communication unit 131 in step S202 exceeds the read temperature threshold value (step S204). When it is determined that the temperature of the secondary battery module 110 exceeds the temperature threshold (step S204: YES), the cooling control unit 133 activates the cooling fan 120 that cools the secondary battery module 110 selected in step S202. (Step S205).

  On the other hand, when it is determined that the temperature does not exceed the temperature threshold (step S204: NO), the cooling control unit 133 determines whether the temperature of the battery cell 111 is equal to or lower than a predetermined normal operating temperature ( Step S206). The normal operating temperature is a temperature that can suppress the progress of deterioration of the battery cell 111 when the battery cell 111 is charged and discharged at the temperature, and is a temperature lower than the temperature threshold. When it is determined that the temperature is equal to or lower than the normal operating temperature (step S206: YES), the cooling control unit 133 stops the cooling fan 120 that cools the secondary battery module 110 selected in step S202 (step S207). . On the other hand, when it is determined that the temperature is not lower than the normal operating temperature (step S206: NO), the cooling control unit 133 maintains the control state of the cooling fan 120 as it is. That is, the cooling control unit 133 maintains the control state of the cooling fan 120 when the temperature does not exceed the temperature threshold and the temperature is not lower than the normal operating temperature.

  When the cooling control unit 133 performs the processing of steps S203 to S207 described above for all the secondary battery modules 110, the battery management device 130 performs processing by an operation by an administrator or the like or an interrupt processing from a higher-level device. It is determined whether an input of an end request has been accepted (step S208). If battery management device 130 determines that it has not received an input of an end request from the outside (step S208: NO), it returns to step S201 and again monitors the temperature of secondary battery module 110. On the other hand, when battery management apparatus 130 determines that an input of an end request has been received from the outside (step S208: YES), it ends the process.

  As described above, according to the present embodiment, the cooling control unit 133 is configured such that when at least one temperature of the secondary battery module 110 exceeds the temperature threshold value of the secondary battery module 110 stored in the threshold value storage unit 132. Then, the cooling fan 120 that cools the secondary battery module 110 is activated. Since the secondary battery modules 110 are provided close to each other, the difference in temperature is usually small. Here, when the cooling fan 120 is controlled based on one temperature threshold value, there is a high probability that a plurality of cooling fans are activated simultaneously, and a large activation current is required for cooling the secondary battery module 110. On the other hand, according to this embodiment, since the temperature threshold value of each secondary battery module 110 can be set to a different value, even if the temperature of a certain secondary battery module 110 exceeds the temperature threshold value, The temperature of the battery module 110 can be prevented from exceeding the temperature threshold. Thereby, according to this embodiment, the probability that the several cooling fan 120 will start simultaneously can be made low. Therefore, the power supply device that supplies electricity to the secondary battery system 100 according to the present embodiment only needs to have the minimum necessary power supply capacity for operating the battery management device 130 and the cooling fan 120.

  Moreover, according to this embodiment, since the cooling fan 120 corresponding to the secondary battery module 110 that needs to be cooled is individually activated, the secondary battery system 100 cools the secondary battery module 110 that needs to be cooled. be able to. In addition, according to the present embodiment, the cooling fan 120 stops the cooling fan 120 corresponding to the secondary battery module 110 that does not need to be cooled. The increase in inrush current due to simultaneous activation of the cooling fans 120 can be prevented. It is possible to suppress a sudden increase in power burden on the secondary battery system 100 and to prevent the secondary battery system 100 from stopping abnormally.

<< Second Embodiment >>
FIG. 4 is a schematic block diagram showing the configuration of the secondary battery system 300 according to at least one embodiment. In FIG. 4, a solid line indicates a power line, and a broken line indicates a data line.
The secondary battery system 300 according to the second embodiment changes the temperature threshold of the secondary battery module 110 according to the rate of change of the deterioration degree of the secondary battery module 110. Here, the deterioration degree of the secondary battery module 110 is a value represented by a ratio between the capacity of the secondary battery module 110 and the nominal capacity or the initial capacity. That is, the degree of deterioration of the secondary battery module 110 indicates the degree of decrease in the amount of electricity that can be charged in the secondary battery module 110. In the second embodiment, the rate of change in the degree of deterioration of the secondary battery module 110 is an example of a value related to the degree of deterioration of the secondary battery.

  In the secondary battery system 300 according to the second embodiment, in addition to the configuration of the first embodiment, the battery management device 330 includes a current detection unit 334, a deterioration prediction unit 335, a change rate calculation unit 336, and a threshold change unit 337. Further prepare. In addition, the cell monitoring device 112 according to the second embodiment detects the voltage value of each battery cell 111 in addition to the temperature of the secondary battery module 110. Of the configurations of the second embodiment, those having the same configuration as the first embodiment will be described using the same reference numerals as those of the first embodiment. Note that the current detection unit 334 may be provided inside the battery module 110 and configured to detect current with the cell monitoring device 112.

The current detection unit 334 performs A / D conversion on the current flowing between the battery cells 111 of the secondary battery module 110 in which the battery cells 111 are connected in series, and detects the current value of the secondary battery module 110.
The deterioration prediction unit 335 predicts the deterioration degree of the secondary battery module 110.

The change rate calculation unit 336 stores the deterioration degree of each secondary battery module 110 predicted by the deterioration prediction unit 335 in the previous process. The degree of deterioration of the secondary battery module 110 predicted in the previous process indicates the degree of deterioration of the secondary battery module 110 at a past time from the current time by a time corresponding to the deterioration degree prediction cycle. Then, the change rate calculation unit 336 calculates the change rate of the deterioration level of each secondary battery module 110 based on the previous deterioration level and the deterioration level newly predicted by the deterioration prediction unit 335.
The threshold value changing unit 337 changes the temperature threshold value of each secondary battery module 110 stored in the threshold value storage unit 132 based on the change rate of the deterioration degree of each secondary battery module 110 calculated by the change rate calculation unit 336.

  As shown in FIG. 3, the secondary battery system 300 according to the second embodiment controls the cooling fan 120 according to the same procedure as in the first embodiment. On the other hand, the secondary battery system 300 according to the second embodiment performs a temperature threshold value changing process used for determining whether or not to start the cooling fan 120 in parallel with the control of the cooling fan 120 shown in FIG. .

FIG. 5 is a flowchart illustrating a temperature threshold changing operation according to at least one embodiment.
First, the module communication unit 131 of the battery management device 330 acquires the voltage value of each battery cell 111 from the cell monitoring device 112 of each secondary battery module 110. Further, the current detection unit 334 of the battery management device 330 detects a current value based on the current of the secondary battery module 110 (step S401). Next, the degradation predicting unit 335 predicts the degradation level of the secondary battery module 110 using the voltage value of each battery cell 111 or the current value of the secondary battery module 110 (step S402). The deterioration prediction unit 335 can predict the deterioration degree using, for example, the following method.

  For example, since the internal resistance of the secondary battery increases with deterioration, the deterioration prediction unit 335 estimates the internal resistance of the secondary battery module 110 from the voltage value of each battery cell 111 received by the module communication unit 131. The degree of deterioration can be predicted based on the internal resistance. Further, for example, since the deterioration of the secondary battery proceeds by repeating charging and discharging, the deterioration predicting unit 335 is based on the current value of the secondary battery module 110 detected by the current detecting unit 334. The number of charge / discharge cycles can be estimated, and the degree of deterioration can be predicted based on the number of charge / discharge cycles. Further, for example, the deterioration predicting unit 335 includes a state of charge (SOC) derived from the integrated value of the current value detected by the current detecting unit 334 and the voltage value at the time of detection (SOC: State of Charge) and a module communication unit. The degree of deterioration can be predicted based on the difference from the charging rate estimated from the voltage value of each battery cell 111 received by 131.

  Next, the rate-of-change calculation unit 336 changes the rate of change of the degree of deterioration of each secondary battery module 110 based on the degree of deterioration previously predicted by the deterioration prediction unit 335 and the degree of deterioration newly predicted by the deterioration prediction unit 335. Is calculated (step S403). For example, the change rate calculation unit 336 calculates the change rate of the deterioration level by dividing the difference between the previously predicted deterioration level and the newly predicted deterioration level by the previously predicted deterioration level.

  Next, the threshold value changing unit 337 selects the secondary battery modules 110 one by one, and executes the following steps S405 to S407 for each secondary battery module 110 (step S404).

  First, the threshold value changing unit 337 determines whether or not the change rate of the degree of deterioration of the secondary battery module 110 selected in step S404 exceeds the first change rate threshold value (step S405). The first change rate threshold corresponds to an allowable upper limit value of the deterioration progress rate, and is a value set by a designer or administrator of the secondary battery system 300.

  When the threshold value changing unit 337 determines that the change rate of the deterioration degree of the secondary battery module 110 exceeds the first change rate threshold value (step S405: YES), among the temperature threshold values stored in the threshold value storage unit 132, Then, the temperature threshold value associated with the secondary battery module 110 is lowered (step S406). Thereby, the secondary battery system 300 can preferentially cool the secondary battery module 110 whose deterioration is fast. In the present embodiment, the threshold value changing unit 337 subtracts a value obtained by multiplying the difference between the temperature threshold value and the normal operating temperature by a coefficient less than 1 from the temperature threshold value stored in the threshold value storage unit 132. Reduce the temperature threshold. In addition, the threshold value changing unit 337 may lower the temperature threshold value by a predetermined temperature.

  On the other hand, when the threshold value changing unit 337 determines that the change rate of the deterioration degree of the secondary battery module 110 does not exceed the first change rate threshold value (step S405: NO), the deterioration of the other secondary battery module 110 is performed. Calculate the average rate of change in degrees. Next, the threshold value changing unit 337 determines whether or not the change rate of the deterioration degree of the secondary battery module 110 is greater than the average value of the change rates of the deterioration degree of the other secondary battery modules 110 by a second change rate threshold value or more. Is determined (step S407). Note that the second change rate threshold is a change rate at which the change rate of the deterioration degree is recognized to be prominent as compared with the other secondary battery modules 110, and is determined by the designer or administrator of the secondary battery system 300. The value to be set.

  When the threshold value changing unit 337 determines that the change rate of the deterioration degree of the secondary battery module 110 is larger than the average value of the change rates of the deterioration degree of the other secondary battery modules 110 by the second change rate threshold value ( Step S407: YES), among the temperature threshold values stored in the threshold value storage unit 132, the temperature threshold value associated with the secondary battery module 110 is decreased (Step S406). As a result, the secondary battery system 300 can preferentially cool the battery whose deterioration progresses faster than the other secondary battery modules 110.

  On the other hand, the threshold value changing unit 337 has a change rate of the deterioration degree of the secondary battery module 110 based on a value obtained by adding the second change rate threshold value to the average value of the change rates of the deterioration degree of the other secondary battery modules 110. When it determines with it being small (step S407: NO), the temperature threshold value which the threshold value memory | storage part 132 memorize | stores is not changed.

  When the threshold value changing unit 337 performs the processing of steps S405 to S407 described above for all the secondary battery modules 110, the battery management device 330 performs processing by an operation by an administrator or the like or an interrupt processing from a higher-level device. It is determined whether an input of an end request has been accepted (step S408). If the battery management device 330 determines that an input of an end request has not been received from the outside (step S408: NO), the battery management device 330 returns to step S401 and again monitors the degree of deterioration of the secondary battery module 110. On the other hand, when it is determined that the input of the termination request has been received from the outside (step S408: YES), the battery management device 330 ends the process.

  Thus, according to the present embodiment, the threshold value changing unit 337 changes the temperature threshold value of each secondary battery module 110 based on the rate of change in the degree of deterioration of the secondary battery module 110. As a result, the secondary battery system 300 can preferentially cool the secondary battery module 110 that is predicted to progress quickly, and thus suppress the progress of deterioration of the secondary battery module 110. it can. In addition, according to the present embodiment, since the temperature threshold value of each secondary battery module 110 varies depending on the progress of deterioration of the secondary battery module 110, the probability that a plurality of cooling fans 120 are activated simultaneously is reduced. Can do. For this reason, it is possible to prevent an increase in inrush current due to simultaneous activation of the plurality of cooling fans 120. It is possible to suppress a sudden increase in the power load on the secondary battery system 300 and prevent the secondary battery system 300 from stopping abnormally.

<< Third Embodiment >>
FIG. 6 is a schematic block diagram illustrating a configuration of a secondary battery system 500 according to at least one embodiment. In FIG. 6, a solid line indicates a power line, and a broken line indicates a data line.
The secondary battery system 500 according to the third embodiment changes the temperature threshold based on the current deterioration degree of the secondary battery module 110 in addition to the change rate of the deterioration degree of the secondary battery module 110. In the third embodiment, the deterioration degree of the secondary battery module 110 and the change rate of the deterioration degree of the secondary battery module 110 are examples of values related to the deterioration degree of the secondary battery. The battery management device 530 according to the third embodiment differs from the second embodiment in the processing contents of the threshold value changing unit 537. In addition, about the structure of 3rd Embodiment, what is the same structure as 2nd Embodiment is demonstrated using the same code | symbol as 2nd Embodiment.

FIG. 7 is a flowchart illustrating a temperature threshold changing operation according to at least one embodiment. Of the procedures according to the third embodiment, the same steps as those of the second embodiment will be described using the same reference numerals as those of the second embodiment.
First, the module communication unit 131 of the battery management device 530 acquires the voltage value of each battery cell 111 from the cell monitoring device 112 of each secondary battery module 110. Further, the current detection unit 334 of the battery management device 530 detects a current value based on the current of the secondary battery module 110 (step S401). Next, the degradation predicting unit 335 predicts the degradation level of the secondary battery module 110 using the voltage value of each battery cell 111 or the current value of the secondary battery module 110 (step S402).

  Next, the rate-of-change calculation unit 336 changes the rate of change of the degree of deterioration of each secondary battery module 110 based on the degree of deterioration previously predicted by the deterioration prediction unit 335 and the degree of deterioration newly predicted by the deterioration prediction unit 335. Is calculated (step S403). Next, the threshold value changing unit 537 selects the secondary battery modules 110 one by one, and executes the following steps S405 to S407 and steps S601 to S603 for each secondary battery module 110 (step S404).

  First, the threshold value changing unit 537 determines whether or not the deterioration level of the secondary battery module 110 selected in step S404 exceeds the first deterioration level threshold value (step S601). The first deterioration degree threshold is a deterioration degree that has a high probability that when the deterioration degree of the secondary battery module 110 exceeds the value, the rate of change of the deterioration degree of the secondary battery module 110 greatly increases. For example, a deterioration degree of 70% is adopted.

  When the threshold value changing unit 537 determines that the deterioration level of the secondary battery module 110 exceeds the first deterioration level threshold value (step S601: YES), the threshold value changing unit 537 among the two temperature threshold values stored in the threshold value storage unit 132. The temperature threshold value associated with the secondary battery module 110 is lowered to the normal operating temperature (step S602). As a result, the secondary battery system 500 can always operate the secondary battery module 110, which has a high degree of deterioration and is expected to accelerate the subsequent deterioration, at a normal operating temperature.

  On the other hand, when the threshold value changing unit 537 determines that the deterioration level of the secondary battery module 110 does not exceed the first deterioration level threshold value (step S601: NO), the deterioration of the secondary battery module 110 selected in step S404. It is determined whether or not the change rate of the degree exceeds the first change rate threshold value (step S405).

  When the threshold value changing unit 537 determines that the change rate of the deterioration degree of the secondary battery module 110 exceeds the first change rate threshold value (step S405: YES), the threshold value changing unit 537 includes the temperature threshold value stored in the threshold value storage unit 132. Then, the temperature threshold value associated with the secondary battery module 110 is lowered (step S406). On the other hand, when the threshold value changing unit 537 determines that the change rate of the deterioration degree of the secondary battery module 110 does not exceed the first change rate threshold value (step S405: NO), the deterioration of the other secondary battery module 110 is performed. Calculate the average degree. Next, the threshold value changing unit 537 determines whether or not the deterioration level of the secondary battery module 110 is larger than the average value of the deterioration levels of other secondary battery modules 110 by a second deterioration level threshold value or more (step). S603). The second deterioration degree threshold is a deterioration degree that is recognized as a deterioration degree that is prominent compared to other secondary battery modules 110, and is set by a designer or administrator of the secondary battery system 500. Value.

  When the threshold value changing unit 537 determines that the deterioration level of the secondary battery module 110 is larger than the average value of the deterioration levels of the other secondary battery modules 110 by a second deterioration level threshold or more (step S603: YES), Of the temperature threshold values stored in the threshold value storage unit 132, the temperature threshold value associated with the secondary battery module 110 is decreased (step S406). As a result, the secondary battery system 500 can preferentially cool those having a high degree of deterioration as compared with the other secondary battery modules 110.

  On the other hand, when the threshold value changing unit 537 determines that the deterioration level of the secondary battery module 110 is smaller than the average value of the deterioration levels of the other secondary battery modules 110 plus the second deterioration level threshold value ( Step S603: NO), the average value of the rate of change in the degree of deterioration of the other secondary battery modules 110 is calculated. Next, the threshold value changing unit 537 determines whether or not the change rate of the deterioration level of the secondary battery module 110 is greater than the second change rate threshold value by an average value of the change rates of the deterioration levels of the other secondary battery modules 110. Is determined (step S407).

  When the threshold value changing unit 537 determines that the change rate of the deterioration level of the secondary battery module 110 is greater than the average value of the change rates of the deterioration levels of the other secondary battery modules 110 by the second change rate threshold value ( Step S407: YES), among the temperature threshold values stored in the threshold value storage unit 132, the temperature threshold value associated with the secondary battery module 110 is decreased (Step S406). On the other hand, the threshold value changing unit 537 has a change rate of the deterioration degree of the secondary battery module 110 based on a value obtained by adding the second change rate threshold value to the average value of the change rates of the deterioration degree of the other secondary battery modules 110. When it determines with it being small (step S407: NO), the temperature threshold value which the threshold value memory | storage part 132 memorize | stores is not changed.

  When the threshold value changing unit 537 performs the processes of steps S405 to S407 and steps S601 to S603 described above for all the secondary battery modules 110, the battery management device 530 determines whether or not an input of a process end request has been received. Determination is made (step S408). If the battery management device 530 determines that the input of the termination request is not received from the outside (step S408: NO), the battery management device 530 returns to step S401, and again monitors the deterioration level of the secondary battery module 110. On the other hand, when battery management apparatus 530 determines that an input of an end request has been received from the outside (step S408: YES), it ends the process.

  Thus, according to the present embodiment, the threshold value changing unit 537 changes the temperature threshold value of each secondary battery module 110 based on the deterioration degree of the secondary battery module 110 and the rate of change of the deterioration degree. As a result, the secondary battery system 500 can preferentially cool the secondary battery module 110 that has deteriorated and the secondary battery module 110 that is predicted to progress quickly. it can. Furthermore, since the temperature threshold value of each secondary battery module 110 is different, the probability that a plurality of cooling fans 120 are activated simultaneously can be reduced, and an increase in inrush current due to the activation of a plurality of cooling fans 120 can be reduced. This can prevent a sudden increase in the power burden on the secondary battery system 500.

<< Fourth Embodiment >>
FIG. 8 is a schematic block diagram illustrating a configuration of a secondary battery system 700 according to at least one embodiment. In FIG. 8, a solid line indicates a power line, and a broken line indicates a data line.
The secondary battery system 700 according to the fourth embodiment is a charge / discharge cycle of the secondary battery module 110 generated based on a past operation result of the secondary battery system 700 by a user of the secondary battery system 700. The temperature threshold value is changed based on the relationship between the number and the change rate of the deterioration degree. The battery management apparatus 730 according to the fourth embodiment further includes a charge / discharge cycle number calculation unit 738 and a deterioration model storage unit 739 in addition to the configuration of the second embodiment. Further, the fourth embodiment differs from the second embodiment in the processing contents of the threshold value changing unit 737. In addition, about the structure of 4th Embodiment, what is the same structure as 2nd Embodiment is demonstrated using the same code | symbol as 2nd Embodiment.

The charge / discharge cycle number calculation unit 738 calculates the charge / discharge cycle number of each secondary battery module 110 based on the current value detected by the current detection unit 334.
The deterioration model storage unit 739 is generated based on the past operation result of the secondary battery system 700 by the user of the secondary battery system 700, and the change rate of the charge / discharge cycle number and deterioration degree of the secondary battery module 110. A deterioration model table showing the relationship between

  The threshold value changing unit 737 acquires a change rate corresponding to the number of charge / discharge cycles of the secondary battery module 110 from the deterioration model storage unit 739, and sets a value larger than the change rate by a predetermined value as the first change rate threshold value. The determination in step S405 shown in FIG. 5 is performed. In other words, according to the present embodiment, the threshold value changing unit 737 has the temperature of the secondary battery module 110 having a larger change rate of the deterioration degree than the deterioration model derived from the past operation results of the user of the secondary battery system 700. Reduce the threshold. Thereby, the secondary battery system 700 which concerns on this embodiment can perform the temperature control suitable for a user's operation.

<< Fifth Embodiment >>
FIG. 9 is a schematic block diagram showing a configuration of a secondary battery system 800 according to at least one embodiment. In FIG. 9, a solid line indicates a power line, and a broken line indicates a data line.
In the second embodiment, another secondary battery module 110 included in the secondary battery system 300 determines whether or not to change the temperature threshold value of the secondary battery module 110 selected in step S404 in step S407 shown in FIG. It was explained that it is determined by comparing the change rate of the degree of deterioration. On the other hand, in the fifth embodiment, when the host controller 840 collectively refers to a plurality of secondary battery systems 800-1 to 800-L (hereinafter, secondary battery systems 800-1 to 800-L), Each secondary battery system 800 is managed by the host controller 840 to determine whether or not the temperature threshold value of the secondary battery module 110 is to be changed. It is determined based on the rate of change in the degree of deterioration of 800 secondary battery modules 110.

  The battery management device 830 according to the fifth embodiment further includes a higher-level communication unit 838 in addition to the configuration of the second embodiment. Further, the fifth embodiment is different from the second embodiment in the processing contents of the threshold changing unit 837. Note that, in the configuration of the fifth embodiment, the same configuration as that of the second embodiment will be described using the same reference numerals as those of the second embodiment.

  The host system communication unit 838 transmits the deterioration rate change rate of each secondary battery module 110 calculated by the change rate calculation unit 336 to the host control device 840. The host controller 840 receives the rate of change in the degree of deterioration of each secondary battery module 110 from each secondary battery system 800. That is, the host controller 840 receives the rate of change in the degree of deterioration of all the secondary battery modules 110 to be managed.

  Next, the host controller 840 transmits to each secondary battery system 800 the rate of change in the degree of deterioration of all secondary battery modules 110 to be managed by the host controller 840. Then, in step S407 shown in FIG. 5, the threshold value changing unit 837 indicates the change rate of the deterioration level of the secondary battery module 110 selected in step S404, based on the deterioration level received by the higher-level communication unit 838 from the higher-level control device 840. It is determined whether or not the second change rate threshold is greater than the average value of the change rates. Thereby, the secondary battery system 800 can make the progress of deterioration of the secondary battery module 110 uniform with the other secondary battery system 800 managed by the host controller 840.

Although several embodiments have been described in detail with reference to the drawings, the specific configuration is not limited to the above-described one, and various design changes and the like can be made.
For example, in the above-described embodiment, the case where the cooling fan 120 is employed as an example of the cooling unit has been described, but the present invention is not limited thereto. In another embodiment, for example, a water-cooled cooling device or a heat pump may be employed as the cooling unit. In this case as well, it is necessary to prevent an increase in inrush current caused by simultaneously starting the cooling unit.

  In the above-described embodiment, the case where the degree of deterioration or the rate of change of the degree of deterioration is used as the value related to the degree of deterioration has been described. In another embodiment, the open circuit voltage of the battery cell 111, the number of charge / discharge cycles, or the like may be used as the value related to the degree of deterioration.

  Moreover, although embodiment mentioned above demonstrated the case where the some secondary battery module 110 was made into the object of cooling, it is not restricted to this. For example, when the cooling fan 120 is provided corresponding to each battery cell 111 included in the secondary battery module 110, the cooling control unit 133 controls the cooling fan 120 based on the temperature threshold set for each battery cell 111. You may do it. In this case, the plurality of battery cells 111 is an example of a plurality of secondary batteries.

FIG. 10 is a schematic block diagram illustrating a configuration of a computer 900 according to at least one embodiment.
The computer 900 includes a CPU 910, a main storage device 920, an auxiliary storage device 930, and an interface 940.
The battery management apparatus (for example, battery management apparatuses 130, 330, 530, 730, and 830) according to at least one embodiment is implemented in the computer 900. The operation of each processing unit described above is stored in the auxiliary storage device 930 in the form of a program. The CPU 910 reads the program from the auxiliary storage device 930, expands it in the main storage device 920, and executes the above processing according to the program. In addition, the CPU 910 secures a storage area corresponding to each storage unit described above in the main storage device 920 according to the program.

  In at least one embodiment, the auxiliary storage device 930 is an example of a tangible medium that is not temporary. Other examples of the tangible medium that is not temporary include a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, and a semiconductor memory connected via the interface 940. When this program is distributed to the computer 900 via a communication line, the computer 900 that has received the distribution may develop the program in the main storage device 920 and execute the above processing.

  The program may be for realizing a part of the functions described above. Further, the program may be a so-called difference file (difference program) that realizes the above-described function in combination with another program already stored in the auxiliary storage device 930.

  In the present specification, ordinal numbers such as “first” and “second” are used to distinguish the constituent elements from each other, and do not imply order or importance.

  DESCRIPTION OF SYMBOLS 100 ... Secondary battery system 110 ... Secondary battery module 111 ... Battery cell 112 ... Cell monitoring apparatus 120 ... Cooling fan 130 ... Battery management apparatus 131 ... Module communication part 132 ... Threshold memory | storage part 133 ... Cooling control part 300 ... Secondary battery System 330 ... Battery management device 334 ... Current detection unit 335 ... Deterioration prediction unit 336 ... Change rate calculation unit 337 ... Threshold change unit 500 ... Secondary battery system 530 ... Battery management device 537 ... Threshold change unit 700 ... Secondary battery system 730 ... Battery management device 737 ... Threshold change unit 738 ... Charge / discharge cycle number calculation unit 739 ... Deterioration model storage unit 800 ... Secondary battery system 830 ... Battery management device 837 ... Threshold change unit 838 ... Upper system communication unit 840 ... Upper control device 900 ... Computer 910 ... CPU 920 ... Main憶 930 ... auxiliary storage device 940 ... interface

Claims (8)

A plurality of secondary battery modules;
A plurality of cooling units for cooling each of the at least one secondary battery module;
The temperature of the secondary battery module is acquired, and when at least one temperature of the secondary battery module exceeds the temperature threshold of the secondary battery module, the temperature exceeding the temperature threshold among the plurality of cooling units A secondary battery system comprising: a cooling control unit that activates a cooling unit that individually cools the secondary battery module. The secondary battery according to claim 1, further comprising: a threshold value changing unit that changes the temperature threshold value of each of the secondary battery modules based on a deterioration rate value calculated for each of the secondary battery modules. Battery system. The said threshold value change part reduces the said temperature threshold value of the said secondary battery module, when the at least 1 said deterioration rate value of the said secondary battery module exceeds a 1st threshold value. The secondary battery system described in 1. The threshold value changing unit is configured such that a first deterioration rate value that is at least one of the deterioration rate values of the secondary battery module is second than a second deterioration rate value that is the deterioration rate value of the other secondary battery. 4. The secondary battery system according to claim 2, wherein the temperature threshold value corresponding to the secondary battery module is lowered when the threshold value is larger than the threshold value. A deterioration model storage unit that stores a deterioration model that is information relating the number of charge / discharge cycles of the secondary battery module and the deterioration rate value;
The threshold value changing unit acquires a deterioration rate value based on the deterioration model stored in the deterioration model storage unit and the number of charge / discharge cycles of the secondary battery module, and a value larger than the deterioration rate value by a predetermined value, The secondary battery system according to claim 3, wherein the first threshold value is used. A control device that controls a secondary battery system including a plurality of secondary battery modules and a plurality of cooling units that respectively cool at least one of the secondary battery modules,
When the temperature of the secondary battery module is acquired and at least one temperature of the secondary battery module exceeds the temperature threshold of the secondary battery module, the temperature of the plurality of cooling units is less than the temperature threshold. A control device comprising: a cooling control unit that individually activates a cooling unit that cools an excess secondary battery module. A control method for controlling a secondary battery system including a plurality of secondary battery modules and a plurality of cooling units for cooling each of the at least one secondary battery module,
A control device acquiring the temperature of the secondary battery module;
Determining whether at least one temperature of the secondary battery module exceeds a temperature threshold of the secondary battery module;
When the control device determines that at least one temperature of the secondary battery module has exceeded a temperature threshold of the secondary battery module, a secondary of which the temperature has exceeded the temperature threshold among the plurality of cooling units. And a step of individually starting a cooling unit for cooling the battery module. Computer
A plurality of secondary battery modules that respectively acquire temperatures of a plurality of secondary battery modules and that cool at least one of the secondary battery modules when the temperature of at least one of the secondary battery modules exceeds a temperature threshold of the secondary battery module. The program for functioning as a cooling control part which starts individually the cooling part which cools the secondary battery module in which temperature exceeded the said temperature threshold value among the cooling parts.

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