JP6868730B2 - Power storage system and its temperature control method - Google Patents

Description

The present invention relates to a power storage system including a storage for storing storage batteries and a temperature control method thereof.

In recent years, efforts aimed at reducing energy consumption have been emphasized as part of environmental measures or disaster countermeasures. Against this background, power storage systems that store power consumed in demand areas and supply power as needed are becoming widespread. It is known that the performance of a storage battery largely depends on the environmental temperature, and that the storage battery deteriorates remarkably especially when charging / discharging at a high temperature. Therefore, various temperature control techniques have been proposed to prevent the environmental temperature of the storage battery from rising excessively.

For example, Patent Document 1 proposes a control method for stopping a cooling fan that blows cooling air when the battery temperature becomes equal to or less than the value obtained by adding the offset temperature to the temperature of the cooling air for a battery for electric vehicles. Has been done. That is, it is described that wasteful power consumption can be saved by stopping the cooling fan in a situation where the cooling air contributes little to the battery cooling.

JP 2001-130268 (Claim 1, Abstract)

By the way, in a power storage system provided with a storage, it is considered that the environmental temperature of the storage battery is always higher than the external temperature during the nighttime of the day due to the heat retention effect in the storage. In this case, if the control method proposed in Patent Document 1 is applied as it is, off control in which the cooling fan is not operated is always performed in the nighttime zone.

As a result, in order to save energy in the daytime zone, so-called "night purge", in which outside air is actively introduced immediately before (nighttime zone), is not performed. In addition, when applying night purge to the power storage system, the usage environment of the storage battery must be taken into consideration.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a power storage system capable of suppressing energy consumption throughout the day while appropriately cooling the storage battery, and a temperature control method thereof. ..

The "storage system" according to the present invention includes a storage battery configured to be able to charge and discharge electric power, a storage for storing the storage battery, an intake fan for sucking outside air into the storage, and an environmental temperature of the storage battery. The first measurement is performed in the first measurement unit for measuring, a time zone division unit that divides a day into a plurality of time zones, and a night zone that is one of the time zones divided by the time zone division unit. The unit includes an intake control unit that controls on / off of the intake fan according to the ambient temperature measured sequentially by the unit.

Generally speaking, a storage battery applied to a power storage system is mainly composed of a heat storage material having a large specific heat and specific gravity, and has a large volume in order to increase the battery capacity. Therefore, the storage battery exerts a cold insulation function that suppresses its own temperature rise. On the other hand, since the storage battery may operate at any time during the day, it is desirable that the environmental temperature of the storage battery is always maintained within an appropriate operating range.

Therefore, by controlling the on / off of the intake fan according to the environmental temperature measured sequentially in the divided night zone, the environmental temperature of the storage battery in operation is taken into consideration while utilizing the cold insulation function of the storage battery. It is possible to carry out night purge. As a result, energy consumption throughout the day can be suppressed while appropriately cooling the storage battery.

Further, a threshold value setting unit for setting a threshold value related to the on / off control is further provided, and the intake air control unit performs on control of the intake fan when the environmental temperature exceeds the threshold value, and exceeds the threshold value. If not, it is preferable to control the intake fan off. Appropriate temperature control can be performed even with a simple control method using a threshold value.

Further, a second measuring unit for measuring the external temperature of the storage is further provided, and the intake control unit is said to have the environmental temperature when the external temperature measured by the second measuring unit exceeds the environmental temperature. It is preferable to control the intake fan off even though the temperature exceeds the threshold value. As a result, it is possible to prevent unnecessary inhalation of outside air having a temperature higher than the environmental temperature.

Further, it is preferable that the threshold value setting unit sets the threshold value corresponding to each time zone and sets the threshold value corresponding to the night zone to the smallest value. Appropriate temperature control can be performed by using a uniform control method regardless of the time zone.

Further, it is preferable that the threshold value setting unit sets the threshold value corresponding to at least the nighttime zone to a value smaller than 25 ° C. By maintaining the environmental temperature below 25 ° C., the cold insulation effect of the storage battery can be sufficiently obtained. Also, considering that the characteristics of the battery are generally specified at 25 ° C, the expected life is clearly designed by keeping the environmental temperature below 25 ° C, and the operating environment of the storage battery is sufficiently guaranteed. It can be said that there is.

Further, the threshold value setting unit variably sets the threshold value corresponding to the specific day according to the expected temperature information regarding the expected temperature and / or the operation plan information regarding the operation plan of the storage battery on the present or future specific day. It is preferable to do so. By setting the threshold value in consideration of the expected temperature and / or the operation plan, it is possible to carry out a night purge suitable for the power usage situation on a specific day.

Further, the time zone division unit can change the night zone corresponding to the specific day according to the expected temperature information regarding the expected temperature and / or the operation plan information regarding the operation plan of the storage battery on the present or future specific day. It is preferable to classify into. By classifying the night zone in consideration of the expected temperature and / or the operation plan, it is possible to carry out a night purge suitable for the power usage situation on a specific day.

The "temperature control method of a power storage system" according to the present invention includes a storage battery configured to be able to charge and discharge electric power, a storage for storing the storage battery, and an intake fan for sucking outside air into the storage. A method related to a power storage system, in which a measurement step of measuring the environmental temperature of the storage battery, a division step of dividing a day into a plurality of time zones, and a night zone, which is one of the divided time zones, are sequentially performed. A control step for controlling on / off of the intake fan according to the measured ambient temperature is provided.

According to the power storage system and the temperature control method thereof according to the present invention, it is possible to suppress energy consumption throughout the day while appropriately cooling the storage battery.

It is a perspective view which shows the appearance of the power storage system which concerns on this embodiment. It is a top view which shows the internal structure of the power storage system of FIG. It is an electric block diagram of the temperature control device stored in the storage of FIG. It is a schematic diagram which shows the setting example of the threshold value which concerns on-off control. It is a 1st flowchart provided for the operation explanation of a temperature control apparatus. It is explanatory drawing which shows the cold insulation effect by a storage battery. It is a 2nd flowchart provided for the operation explanation of the temperature control apparatus.

Hereinafter, the power storage system according to the present invention will be described with reference to the accompanying drawings with reference to suitable embodiments in relation to the temperature control method.

[Configuration of power storage system 10]
FIG. 1 is a perspective view showing the appearance of the power storage system 10 according to this embodiment. FIG. 2 is a plan view showing the internal structure of the storage 12 of FIG. FIG. 3 is an electrical block diagram of the temperature control device 50 stored in the storage 12 of FIG.

As shown in FIG. 1, the power storage system 10 is installed outdoors such as on the roof of a building or on the side of a building. The power storage system 10 includes a storage 12 for storing storage batteries 31 to 36 (FIG. 2). The steel plate storage 12 is a so-called cubicle having a rectangular parallelepiped shape. On the front side of the storage 12, an opening / closing door 16 that can be accessed from the outside (that is, can enter / exit the room) is provided.

The opening / closing door 16 is formed with ventilation holes 18 and 18 on the central side in the width direction and ventilation holes 19 and 19 on the outer side in the width direction at the same height position. A tubular weather cover 20 is provided in each of the ventilation holes 18, and a tubular weather cover 21 is provided in each of the ventilation holes 19. In the hollow portion of each weather cover 21, one outside thermometer 22 (second measuring unit) for measuring the outside temperature To of the storage 12 is fixedly arranged.

As shown in FIG. 2, in the internal space 30 of the storage 12, the six storage batteries 31, 32, 33, 34, 35, 36 arranged in two rows in a staggered manner, and the storage batteries 31 to 36, respectively, are electrically connected. A connected AC / DC conversion device 38 is provided.

Each of the storage batteries 31 to 36 is a secondary battery configured to be able to charge and discharge electric power, for example, a lead storage battery or a lithium ion battery. The storage batteries 31 to 36 are power storage modules configured by connecting a single cell or a plurality of cells in series. The configurations of the storage batteries 31 to 36 may be other than this, and a sodium-sulfur battery, another type of secondary battery including a nickel hydrogen battery, a capacitor including an electric double layer type, or a composite battery combining these may be used. May be.

The AC / DC conversion device 38 is a device (so-called power conditioner) that converts between AC power (AC) and DC power (DC) in both directions and executes charge / discharge control of storage batteries 31 to 36. The AC / DC conversion device 38 is connected to a commercial power source via a power facility (not shown) different from the power storage system 10.

Cylindrical weather covers 24, 24, 25, and 25 are provided on the back side of the storage 12 at positions facing the weather covers 20 and 21 on the front side, respectively. One intake fan 40 for sucking outside air is provided in the storage 12 at a position corresponding to each of the weather covers 20 and 21 on the front side. One exhaust fan 42 for exhausting the air in the storage 12 is provided at a position corresponding to each of the weather covers 24 and 25 on the back side.

As can be understood from this figure, since the storage batteries 31 to 36 are arranged near the intake fan 40, it is possible to directly introduce outside air toward the storage batteries 31 to 36, and the cooling efficiency of the storage batteries 31 to 36 can be improved. It gets higher. Further, since the AC / DC conversion device 38 is arranged near the exhaust fan 42, the heat generated from the AC / DC conversion device 38 can be directly discharged, and there is an effect of suppressing the temperature rise of the internal space 30.

The intake fan 40 and the exhaust fan 42 function as ventilation means 44 for ventilating the internal space 30 of the storage 12 by using the air of the outside 14 by performing the intake operation and the exhaust operation synchronously or asynchronously. ..

As shown in FIG. 3, the power storage system 10 includes an outside thermometer 22, an AC / DC conversion device 38, an intake fan 40, an exhaust fan 42 (FIG. 2), a temperature control device 50, and an inside thermometer 52 ( A first measuring unit) is further provided. Each of the above-mentioned components is connected to the temperature control device 50 so as to be able to communicate with each other by wire or wirelessly.

The temperature control device 50 includes, for example, a CPU (Central Processing Unit) and a RAM (Random Access Memory), and is a device that controls the temperature control of the power storage system 10. The temperature control device 50 includes an information acquisition unit 54, a time zone division unit 56, a threshold value setting unit 58, an intake control unit 60, and an exhaust control unit 62. Hereinafter, the intake control unit 60 and the exhaust control unit 62 may be collectively referred to as a ventilation control unit 64.

The internal thermometer 52 is provided at any position in the internal space 30 and measures the environmental temperature Tc of the storage batteries 31 to 36. Here, the environmental temperature Tc is the actual temperature of the storage batteries 31 to 36 or a temperature that correlates with the actual temperature (for example, the ambient temperature).

In this example, the temperature control device 50 is a device separate from the AC / DC conversion device 38, but the device configuration is not limited to this. Specifically, an integrated device configuration in which each functional unit of the temperature control device 50 is incorporated in the AC / DC conversion device 38 may be adopted.

[Operation of power storage system 10]
The power storage system 10 according to this embodiment is configured as described above. Subsequently, the operation of the power storage system 10, mainly the operation of the temperature control device 50 related to the temperature control control of the storage batteries 31 to 36, will be described in detail. In this temperature control control, the on / off control of the ventilation means 44 (FIG. 5) and the setting of the threshold value Th (FIG. 7) are performed asynchronously.

<Example of threshold Th setting>
FIG. 4 is a schematic view showing an example of setting the threshold value Th related to on / off control. As will be described later, after [1] time zone division by the time zone division unit 56 (step S13 in FIG. 7) and [2] threshold setting by the threshold value setting unit 58 (steps S15 and S16 in FIG. 7), The threshold Th corresponding to each time zone is determined.

As can be understood from this figure, a specific day (0:00 to 24:00) is divided into two time zones. Specifically, "0:00 to 7:00" and "18:00 to 24:00" are nighttime zones, and "7:00 to 18:00" is daytime zones. The threshold Th corresponding to the night zone is Th = Ts−ΔT1, and the threshold Th corresponding to the daytime zone is Th = Ts + ΔT2. Both threshold values Th are within the operating range (recommended usage range) of the storage batteries 31 to 36.

Ts is a standard temperature at which the expected life of the storage batteries 31 to 36 or the rated discharge rate conversion capacity is determined. Further, ΔT1 and ΔT2 are offset amounts with respect to the standard temperature Ts, respectively, and both are zero or positive values. Specific examples of each value are Ts = 25 ° C., ΔT1 = 4 ° C., and ΔT2 = 4 ° C.

As described above, the threshold value Th corresponding to the nighttime zone is set to a value smaller than the threshold value Th corresponding to the daytime zone (remaining time zone) and the standard temperature Ts. With this setting, so-called "night purge" is performed, in which outside air is actively introduced during the nighttime, especially during the summer.

<On / off control of ventilation means 44>
The “on / off control method of the ventilation means 44” executed in the first operation of the temperature control device 50 will be described with reference to the flowchart of FIG. It should be noted that the first operation shown in this figure is executed at relatively short time intervals (for example, every 10 minutes).

Here, in order to improve the ventilation efficiency, it is assumed that the on / off control of the four intake fans 40 and the four exhaust fans 42 is performed synchronously. Apart from this, [1] only four intake fans 40 are synchronously controlled, [2] only four exhaust fans 42 are synchronously controlled, or [3] each intake fan 40 and each exhaust fan 42 are asynchronous. Control may be performed.

In step S1, the internal thermometer 52 measures the environmental temperature Tc of the storage batteries 31 to 36, and then supplies the obtained measurement signal to the temperature control device 50. As a result, the temperature control device 50 acquires the environmental temperature Tc at the current time. When two or more internal thermometers 52 are provided, the statistics of the measured values at a plurality of locations may be obtained as the environmental temperature Tc.

In step S2, the external thermometer 22 measures the external temperature To of the storage 12 and then supplies the obtained measurement signal to the temperature control device 50. As a result, the temperature control device 50 acquires the external temperature To at the current time. When two or more outdoor thermometers 22 are provided, the statistics of the measured values at a plurality of locations may be obtained as the external temperature To.

In step S3, the ventilation means 44 determines whether or not the environmental temperature Tc measured in step S1 exceeds the preset threshold value Th (FIG. 4). This threshold Th is set according to each time zone, and the threshold Th corresponding to the night zone is the smallest (FIG. 4). When Tc ≦ Th is satisfied without exceeding the threshold value Th (step S3: NO), the process proceeds to step S4.

In step S4, the ventilation control unit 64 controls the ventilation means 44 to be off by supplying a drive signal indicating “off” to the ventilation means 44. As a result, the intake fan 40 does not operate, so that the outside air is not sucked into the storage 12. Further, since the exhaust fan 42 does not operate, the air in the storage 12 is not discharged.

On the other hand, when the environmental temperature Tc exceeds the threshold value Th and satisfies Tc> Th (step S3: YES), the process proceeds to step S5.

In step S5, the ventilation control unit 64 determines whether or not the environmental temperature Tc measured in step S1 exceeds the external temperature To measured in step S2. When Tc ≦ To is satisfied without exceeding the external temperature To (step S5: NO), the ventilation means 44 is off-controlled (step S4). As a result, it is possible to prevent unnecessary inhalation of outside air having a temperature higher than the environmental temperature Tc (external temperature To).

On the other hand, when the environmental temperature Tc exceeds the external temperature To and Tc> To is satisfied (step S5: YES), the process proceeds to step S6.

In step S6, the ventilation control unit 64 controls the ventilation means 44 to be turned on by supplying a drive signal indicating “on” to the ventilation means 44. As a result, the intake fan 40 operates, so that the outside air is sucked into the storage 12. Further, since the exhaust fan 42 operates, the air in the storage 12 is discharged.

At the time of on-control, the ventilation volume may be changed stepwise or continuously by changing the fan rotation speed or the number of operating units of the ventilation means 44. For example, the fan rotation speed V (unit: rpm) is given by the following equation (1) or equation (2). Note that A and B are positive multipliers.
V (Tc) = A (Tc-Th) (Tc-To) (1)
V (Tc) = B (1-Th / Tc) (1-To / Tc) (2)

As can be understood from the equation (1), the value of V becomes the minimum (that is, V = 0) when Tc = Th or Tc = To is satisfied. On the other hand, under the premise that Tc> Th and Tc> To, the value of V increases monotonically as Tc increases.

As can be understood from the equation (2), the value of V becomes the minimum (that is, V = 0) when Tc = Th or Tc = To is satisfied. On the other hand, under the premise that Th <Tc <To, the value of V becomes maximum when Tc = 2Th · To / (Th + To) is satisfied.

As described above, the ventilation control unit 64 has [1] the difference between the environmental temperature Tc and the threshold value Th (Tc-Th), [2] the ratio of the threshold value Th to the environmental temperature Tc (Th / Tc), and [3] the environmental temperature. The control amount of the ventilation means 44 is changed by using at least one of the difference between Tc and the external temperature To (Tc-To) or [4] the ratio of the external temperature To to the environmental temperature Tc (To / Tc). You may. This enables more detailed temperature control.

As described above, by sequentially executing steps S1 to S6 of FIG. 5, on / off control of the ventilation means 44 is performed according to the environmental temperature Tc measured sequentially. The cold insulation effect of "night purge" performed by this control will be described with reference to the measurement results in the actual system.

FIG. 6 is an explanatory diagram showing the cold insulation effect of the storage batteries 31 to 36. More specifically, this figure is a graph showing a time series of the environmental temperature Tc (shown by a solid line) and the external temperature To (shown by a broken line) in one day during the summer. The horizontal axis of the graph indicates time (unit: hour), and the vertical axis of the graph indicates temperature (unit: ° C.).

The ventilation means 44 was operated by performing "on / off control using the threshold value Th" (threshold value Th = 21 ° C.) in a part of the nighttime zone (time zone from 0:00 to 7:00). On the other hand, in the remaining time zone (time zone from 7:00 to 24:00), "forced off control" was performed to forcibly stop the operation of the ventilation means 44.

As can be understood from this figure, the external temperature To changes at around 20 ° C between 0:00 and 6:00, but rises sharply after 6:00, and around the maximum value between 11:00 and 15:00. (Approximately 30 ° C) is reached. After that, the external temperature To starts to gradually decrease after 15:00, and changes at around 24 ° C. between 21:00 and 23:00.

On the other hand, the environmental temperature Tc fluctuates around 22 ° C. between 0:00 and 8:00, but gradually increases after 8:00 and reaches the maximum value (about 26 ° C.) around 16:00. After that, the environmental temperature Tc begins to gradually decrease after 16:00, and changes at around 25 ° C. between 21:00 and 23:00.

In this way, the environmental temperature Tc rises following the change in the external temperature To over the daytime zone. However, since a time delay of about 3 hours occurs as compared with the behavior of the external temperature To, the temperature rise is suppressed as compared with the external temperature To. It is considered that this is because the storage batteries 31 to 36 exert a cold insulation function of suppressing the temperature rise of the storage batteries 31 to 36. Generally speaking, the storage batteries 31 to 36 applied to the power storage system 10 are mainly composed of a heat storage material having a large specific heat and specific gravity, and have a large volume in order to increase the battery capacity.

<Threshold Th setting>
Subsequently, the “method of setting the threshold value Th” executed in the second operation of the temperature control device 50 will be described with reference to the flowchart of FIG. 7. It should be noted that the second operation shown in this figure is executed at a relatively long time interval (for example, every hour).

In step S11, the temperature control device 50 determines whether or not the time zone of the day is divided. If it has already been classified (step S11: YES), steps S12 and S13 are omitted. On the other hand, if it has not been classified yet (step S11: NO), the process proceeds to step S12.

In step S12, the information acquisition unit 54 acquires information on the expected temperature (hereinafter, expected temperature information) and / or information on the operation plan of the storage batteries 31 to 36 (hereinafter, operation plan information) from the AC / DC converter 38. Expected temperature information includes, for example, weather, maximum temperature, minimum temperature, time series of temperature, and time series of humidity. Further, the operation plan information includes, for example, a target value of electric energy used, a planned value, an operation plan time, and operation attributes of storage batteries 31 to 36 (specifically, normal operation, maintenance operation, independent operation, etc.). ..

In step S13, the time zone division unit 56 divides the day to be classified into a plurality of time zones (here, “day zone” and “night zone”) by using various information acquired in step S12. .. For example, when the night zone is divided into "between 0:00 and 7:00" and "between 18:00 and 24:00", the first time N1 = 7:00 and the second time N2 = 18:00 indicating the start and end points of the night zone are set. Remember. If the number of divisions is two or more and includes the "night zone", the number of divisions in the time zone or the classification method may be arbitrarily determined.

For example, the time zone division unit 56 may detect a time when the external temperature To suddenly rises (that is, a temperature rise time) using a time series of expected temperatures, and set this time as the first time N1. By accelerating the transition from the night zone to the day zone and changing the threshold value Th in advance to a large value, it is possible to prevent the outside air that is becoming hot from being taken in.

Further, the expected temperature information used in this category is not limited to the time series of the above-mentioned expected temperature, and may be arbitrary meteorological observation information having a high correlation with the external temperature To. For example, the time zone division unit 56 detects the time when the actually measured amount of solar radiation becomes larger than a predetermined value by using a pyranometer (not shown) provided on the outside of the storage 12 and this time. May be set to the first time N1.

In step S14, the temperature control device 50 determines whether or not the current time belongs to the night zone. When it is determined that it belongs to the night zone (step S14: YES), the threshold value setting unit 58 sets the threshold value Th as Th = Ts−ΔT1 (step S15). On the other hand, when it is determined that it does not belong to the night zone (step S14: NO), the threshold value setting unit 58 sets the threshold value Th as Th = Ts + ΔT2 (step S16).

The threshold value setting unit 58 may correct the offset amounts ΔT1 and ΔT2 used for setting the threshold value Th by using various information acquired in step S12. For example, the higher the expected maximum temperature, the longer the planned operation time of the power storage system 10, or the larger the charge / discharge current value of the storage batteries 31 to 36, the larger the values of ΔT1 and ΔT2. To do. On the contrary, the lower the expected maximum temperature, the shorter the planned operation time of the power storage system 10, and the smaller the charge / discharge current values of the storage batteries 31 to 36, the higher the values of ΔT1 and ΔT2. Make it smaller.

For example, the offset amount ΔT1 (° C.) is given by the following equation (3) or equation (4). Note that C and D are positive multipliers.
ΔT1 = C ・ (Planned operation time on a specific day) / 24 (3)
ΔT1 = D ・ (Expected maximum temperature on a specific day-Ts) (4)

As can be understood from the equation (3), ΔT1 is proportional to the planned operation time, and the value of ΔT1 becomes maximum when the planned operation time is 24 hours (full operation). Further, as can be understood from the equation (4), ΔT1 is expressed by a linear function of the expected maximum temperature, and the value of ΔT1 becomes zero when the expected maximum temperature is Ts (= 25 ° C.). ..

As described above, the threshold value Th is set by sequentially executing steps S11 to S16 in FIG. 7. In this operation example, the time zone on the current specific day is divided by using the date change as a trigger, but if various information on the specific day in the future can be acquired, the time zone division (step) is performed at least one day before. S12) or the setting of the threshold value Th (step S13) may be executed in advance.

[Effect of this embodiment]
As described above, the power storage system 10 includes [1] storage batteries 31 to 36 configured to be able to charge and discharge power, [2] storage batteries 12 for storing storage batteries 31 to 36, and [3] storage batteries 12. An intake fan 40 that sucks in outside air, [4] a time zone division section 56 that divides a day into a plurality of time zones, and [5] an internal thermometer 52 that measures the environmental temperature Tc of the storage batteries 31 to 36. The intake control unit 60 that controls the on / off of the intake fan 40 according to the environmental temperature Tc that is sequentially measured in the (first measurement unit) and the nighttime zone, which is one of the time zones divided into [6]. And.

Further, the temperature control method of the power storage system 10 includes [1] a division step of dividing a day into a plurality of time zones (step S13 in FIG. 7) and [2] measurement of measuring the environmental temperature Tc of the storage batteries 31 to 36. A control step (step S4 in FIG. 5) of performing on / off control of the intake fan 40 according to the environmental temperature Tc measured sequentially in the step (step S1 in FIG. 5) and the night zone divided into [3]. S6) and.

Generally speaking, the storage batteries 31 to 36 applied to the power storage system 10 are mainly composed of a heat storage material having a large specific heat and specific gravity, and occupy a large volume in order to increase the battery capacity. Therefore, the storage batteries 31 to 36 exhibit a cold insulation function that suppresses the temperature rise of the storage batteries 31 to 36. On the other hand, since the storage batteries 31 to 36 may operate at any time during the day, it is desirable that the environmental temperature Tc of the storage batteries 31 to 36 is always maintained within an appropriate operating range.

Therefore, by controlling the intake fan 40 on and off according to the environmental temperature Tc that is sequentially measured in the divided night zone, the storage battery 31 that is in operation while utilizing the cold insulation function of the storage batteries 31 to 36 It is possible to carry out a night purge in consideration of the environmental temperature Tc of ~ 36. As a result, energy consumption throughout the day can be suppressed while appropriately cooling the storage batteries 31 to 36.

Further, the power storage system 10 further includes a threshold value setting unit 58 for setting a threshold value Th related to on / off control, and the intake air control unit 60 controls the intake fan 40 to be turned on when the environmental temperature Tc exceeds the threshold value Th. If the threshold value is not exceeded, the intake fan 40 may be turned off. Appropriate temperature control can be performed even with a simple control method using the threshold value Th.

Further, the power storage system 10 further includes an outside thermometer 22 (second measuring unit) that measures the external temperature To of the storage 12, and the intake control unit 60 further includes an external temperature To measured by the outside thermometer 22. When the temperature exceeds the ambient temperature Tc, the intake fan 40 may be off-controlled even though the ambient temperature Tc exceeds the threshold Th. As a result, it is possible to prevent unnecessary inhalation of outside air having a temperature higher than the environmental temperature Tc.

Further, the threshold value setting unit 58 may set the threshold value Th corresponding to each time zone and set the threshold value Th corresponding to the nighttime zone to the smallest value (Ts−ΔT1). Appropriate temperature control can be performed by using a uniform control method regardless of the time zone.

Further, the threshold value setting unit 58 may set the threshold value Th corresponding to at least the nighttime zone to a value smaller than 25 ° C. (standard temperature Ts). By maintaining the environmental temperature Tc below 25 ° C., the cold insulation effect of the storage batteries 31 to 36 can be sufficiently obtained. In addition, considering that the characteristics of the battery are generally specified at 25 ° C, the expected life is clearly designed by maintaining the environmental temperature Tc below 25 ° C, and the operating environment of the storage batteries 31 to 36 is sufficient. It can be said that it is guaranteed to.

Further, the threshold value setting unit 58 variably sets the threshold value Th corresponding to the specific day according to the expected temperature information regarding the expected temperature and / or the operation plan information regarding the operation plan of the storage batteries 31 to 36 on the current or future specific day. It may be set. Further, the time zone division unit 56 may variably classify the night zone corresponding to the specific day according to the expected temperature information and / or the operation plan information. By setting the threshold value Th (or dividing the night zone) in consideration of the expected temperature and / or the operation plan, it is possible to carry out a night purge suitable for the power usage situation on a specific day.

[Remarks]
It should be noted that the present invention is not limited to the above-described embodiment, and of course, it can be freely changed without departing from the gist of the present invention.

10 Storage system 12 Storage 14 External 22 External thermometer (2nd measuring unit)
30 ‥ Internal space 31-36 ‥ Storage battery 38 ‥ AC / DC conversion device 40 ‥ Intake fan 42 ‥ Exhaust fan 44 ‥ Ventilation means 50 ‥ Temperature control device 52 ‥ Internal thermometer (1st measurement unit)
54 ... Information acquisition unit 56 ... Time zone division unit 58 ... Threshold setting unit 60 ... Intake control unit 64 ... Exhaust control unit 66 ... Ventilation control unit Tc ... Environmental temperature Th ... Threshold To ... External temperature Ts ... Standard temperature N1 ... First Time N2 ‥ 2nd time

Claims (8)

A storage battery that can charge and discharge electric power,
A storage for storing the storage battery and
An intake fan that sucks in outside air into the storage
A time zone division section that divides a day into multiple time zones,
The first measuring unit for measuring the environmental temperature of the storage battery and
In the night zone, which is one of the time zones divided by the time zone division unit, the threshold value corresponding to the night zone, which is smaller than the threshold value corresponding to the day zone, and the environment measured sequentially by the first measurement unit. A power storage system including an intake control unit that controls on / off of the intake fan according to a comparison result with temperature. Further, a threshold value setting unit for setting a threshold value related to the on / off control is provided.
The intake control unit is characterized in that when the environmental temperature exceeds the threshold value, the intake fan is turned on, and when the ambient temperature does not exceed the threshold value, the intake fan is turned off. The power storage system described in. A second measuring unit for measuring the external temperature of the storage is further provided.
The intake control unit is characterized in that when the external temperature measured by the second measuring unit exceeds the environmental temperature, the intake fan is turned off even though the environmental temperature exceeds the threshold value. The power storage system according to claim 2. The power storage system according to claim 2 or 3, wherein the threshold value setting unit sets a threshold value corresponding to each time zone and sets the threshold value corresponding to the night zone to the smallest value. The power storage system according to claim 4, wherein the threshold value setting unit sets a threshold value corresponding to at least the nighttime zone to a value smaller than 25 ° C. The threshold value setting unit variably sets the threshold value corresponding to the specific day according to the expected temperature information regarding the expected temperature and / or the operation plan information regarding the operation plan of the storage battery on the current or future specific day. The power storage system according to any one of claims 2 to 5, wherein the power storage system is characterized. The time zone division unit variably divides the night zone corresponding to the specific day according to the expected temperature information regarding the expected temperature and / or the operation plan information regarding the operation plan of the storage battery on the current or future specific day. The power storage system according to any one of claims 1 to 6, wherein the power storage system is characterized by the above. It is a temperature control method of a power storage system including a storage battery configured to be able to charge and discharge electric power, a storage for storing the storage battery, and an intake fan for sucking outside air into the storage.
A division step that divides the day into multiple time zones,
A measurement step for measuring the environmental temperature of the storage battery, and
In the night zone, which is one of the divided time zones, the intake fan has a threshold value corresponding to the night zone, which is smaller than the threshold value corresponding to the day zone, and the environmental temperature measured sequentially. A temperature control method for a power storage system, which comprises a control step for performing on / off control.

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