JP6996128B2 - Control method of stationary storage battery device and stationary storage battery device - Google Patents

Description

The present invention is a stationary storage battery device and a stationary storage battery that stabilizes the power supply to the consumer by storing the electric power generated by the power generation system and supplying the stored electric power to the consumer as needed. It relates to a control method of the device.

The electric power generated from renewable energy in a solar power plant or a wind power plant is stored in a storage battery module in a stationary power storage system to smooth the output power. In addition, the introduction of storage battery systems for the purpose of adjusting surplus power of renewable energy and stabilizing the power system is expanding in factories and substations. In recent years, lithium ion batteries have become widespread as storage batteries used in storage battery modules of stationary power storage systems.

Lithium-ion batteries are affected by the charging time, temperature, number of charge / discharge cycles, etc., and the battery material deteriorates, resulting in a gradual decrease in battery capacity, which eventually requires replacement. Therefore, a storage battery device having a charge / discharge control function for extending the life of an expensive storage battery module has been proposed.

Patent Document 1 has a function of maintaining the temperature inside the storage battery module at a temperature at which deterioration of the storage battery does not easily proceed by optimizing the arrangement of the air supply duct and the exhaust duct constituting the air conditioning system of the storage battery module. The device is disclosed.

Patent Document 2 describes a power storage control device that monitors the ambient temperature of the power storage device and stops the charging of the power storage device when the ambient temperature becomes equal to or lower than a preset threshold temperature to suppress deterioration of the power storage device. Is disclosed.

In Patent Document 3, two sets of power storage equipment are prepared, and the storage battery of the power storage equipment for charging is made to stand by at the lower limit of SOC (State of Charge), and the storage battery of the power storage equipment for discharge is made to stand by at the upper limit of SOC. , A power storage equipment monitoring device that suppresses deterioration of a rechargeable battery is disclosed.

Japanese Unexamined Patent Publication No. 2015-37026 Japanese Unexamined Patent Publication No. 2015-164375 Japanese Unexamined Patent Publication No. 2016-12983

In the power storage device disclosed in Patent Document 1, since the air conditioning system is always operated regardless of the temperature of the storage battery cell constituting the storage battery module and the ambient temperature of the storage battery cell, the power supplied from the power storage device to the air storage system. Increased consumption. As a result, the loss for operating the storage battery increases, and the function as the storage battery device deteriorates.

In the power storage control device disclosed in Patent Document 2, deterioration of the rechargeable battery can be suppressed by stopping charging at a low temperature. However, there is a problem that the function as a power storage device cannot be fulfilled at a low temperature.

In the power storage equipment monitoring device disclosed in Patent Document 3, it is not practical to prepare two sets of expensive power storage equipment in terms of installation cost. Further, in the storage battery constituting the battery module, the optimum SOC to be put on standby changes according to the usage environment of the battery module, so that it is difficult to put the storage battery on standby at the optimum SOC.

The present invention has been made in view of such circumstances, and an object thereof is to provide a stationary storage battery device capable of suppressing deterioration without deteriorating the function of the storage battery and extending the life of the storage battery. be.

The stationary storage battery device that solves the above problems is a stationary storage battery that charges the storage battery installed in the stationary storage device with the power supplied from the power system and supplies the power charged in the storage battery to the power system. In the apparatus, an ambient temperature detecting means for detecting whether the ambient temperature of the storage battery is a high deterioration temperature region or a low deterioration temperature region of the storage battery, and whether the charging state of the storage battery is a high deterioration charging region or a low deterioration charging region of the storage battery. The charge state detecting means for detecting the above, the temperature control device for adjusting the room temperature in the stationary accommodating device, and the temperature control device based on the detection results of the ambient temperature detecting means and the charging state detecting means are required. It is characterized by having a control unit that operates according to the situation.

With this configuration, the temperature control device operates as necessary based on the detection results of the ambient temperature detecting means and the charging state detecting means.
Further, in the stationary storage battery device, the cell temperature detecting means for detecting whether the cell temperature of the storage battery is in the high deterioration temperature region or the low deterioration temperature region is provided, and the control unit includes the ambient temperature detecting means and the charging. It is preferable to operate the temperature control device as necessary based on the detection results of the state detecting means and the cell temperature detecting means.

With this configuration, the temperature control device operates as necessary based on the detection results of the ambient temperature detecting means, the charging state detecting means, and the cell temperature detecting means.
Further, in the stationary storage battery device, in the stationary storage battery device, the control unit has the ambient temperature in the low deterioration temperature region, the charging state in the low deterioration charging state, and the cell temperature in the low deterioration temperature region. When it is in the deteriorated temperature region, it is preferable to stop the operation of the temperature control device.

With this configuration, the operation of the temperature control device is stopped when the ambient temperature is in the low deterioration temperature region, the charging state is in the low deterioration charging state, and the cell temperature is in the low deterioration temperature region.
Further, the stationary storage battery device includes a prediction information management means for outputting charge / discharge prediction information for the storage battery to the control unit, and the control unit is in a charging state when the ambient temperature is in the low deterioration temperature region. However, it is preferable to stop the operation of the temperature control device when the cell temperature is in the low deterioration temperature region and there is no prediction information for charging / discharging a large current to the storage battery in the low deterioration charging state.

With this configuration, the temperature control device is used when the ambient temperature is in the low deterioration temperature region, the charging state is in the low deterioration charging state, the cell temperature is in the low deterioration temperature range, and there is no prediction information for charging / discharging a large current to the storage battery. Operation is stopped.

Further, in the stationary storage battery device, when the ambient temperature is in the high deterioration temperature region, the charging state is in the high deterioration charging state, and the cell temperature is in the high deterioration temperature region. It is preferable to operate the temperature control device to lower the room temperature in the stationary accommodating device at least when the temperature control device is operated or when there is predictive information for charging / discharging a large current to the storage battery.

With this configuration, when the ambient temperature is in the high deterioration temperature region, when the charging state is in the high deterioration charging state, when the cell temperature is in the high deterioration temperature range, or when the storage battery is charged and discharged with a large current, the prediction information can be obtained. At least one of the occasions, the temperature control device is activated to lower the room temperature in the stationary storage device.

Further, in the stationary storage battery device, the control unit sets the charging state of the storage battery in the high deterioration charging region to the low deterioration charging region based on the standby information output from the prediction information management means. It is preferable to charge or discharge the battery.

With this configuration, during standby, the storage battery in the high deterioration charging region is charged or discharged until the charging state becomes the low deterioration charging region.
Further, in the above-mentioned stationary storage battery device, it is preferable to install a solar heat absorbing device that blocks the irradiation of sunlight on the stationary accommodating device.

With this configuration, the sunlight shining on the stationary accommodation device is blocked by the solar heat absorber.
The control method of the stationary storage battery device for solving the above problem is to detect whether the ambient temperature of the storage battery installed in the stationary storage battery is in the high deterioration temperature region or the low deterioration temperature region of the storage battery by the ambient temperature detecting means. The charging state detecting means detects whether the charging state of the storage battery is a high deterioration charging region or a low deterioration charging region of the storage battery, and based on the detection results of the ambient temperature detecting means and the charging state detecting means, the stationary storage is accommodated. It is characterized in that a temperature control device for adjusting the temperature inside the device is operated as needed.

By this method, the temperature control device operates as necessary based on the detection results of the ambient temperature detecting means and the charging state detecting means.

According to the stationary storage battery device of the present invention, deterioration can be suppressed without deteriorating the function of the storage battery, and the life of the storage battery can be extended.

A block diagram showing a stationary storage battery device. Explanatory drawing which shows the operation of the control part of the stationary storage battery apparatus. Explanatory drawing which shows the operation of the control part of the stationary storage battery apparatus. Explanatory drawing which shows the discharge operation of the storage battery at the time of standby. Explanatory drawing which shows the charge operation of a storage battery at the time of standby. Explanatory drawing which shows the discharge operation of the storage battery at the time of standby. Explanatory drawing which shows the charge operation of a storage battery at the time of standby. Explanatory drawing which shows the transition of SOC of the storage battery installed in a factory in one day. Explanatory drawing which shows the transition of SOC of the storage battery installed in a factory in one day. An explanatory diagram showing the transition of the SOC of the storage battery attached to the photovoltaic power generation device in one day. An explanatory diagram showing the transition of the SOC of the storage battery attached to the photovoltaic power generation device in one day. An explanatory diagram showing a change in the discharge capacity retention rate of a storage battery due to a change in temperature and charge time. Explanatory drawing which shows the change of the permissible discharge capacity of a storage battery by the change of SOC and temperature. A perspective view showing a container in which vines block sunlight.

Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings.
FIG. 1 shows the electrical configuration of a stationary storage battery device. The storage battery rack 1 is equipped with a storage battery module in which a large number of storage battery cells composed of, for example, lithium ion batteries are connected in series or in parallel, and is installed in the vicinity of a power generation facility such as a solar power generation device or a wind power generation device. It is housed in container 8 (see FIG. 14).

The storage battery rack 1 is connected to the power system via the power conditioner 2 and the grid interconnection facility 3 installed adjacent to the container 8. The power grid is connected to power generation equipment and a large number of consumers.

Then, the electric power generated by the power generation facility is supplied to each consumer via the electric power system. Further, the electric power generated by the power generation facility is supplied to the storage battery rack 1 via the power system and the power conditioner 2 as needed to charge each storage battery cell, and the charging power of the storage battery rack 1 is supplied to the power conditioner 2 and the power conditioner 2. It is supplied to each consumer via the power system.

A power meter 4, a voltmeter 5, and a thermometer 6 are arranged in the storage battery rack 1 so that the states of a large number of storage battery cells can be detected. That is, a specific storage battery cell is selected in advance as a test cell from a large number of storage battery cells, and the input / output power, output voltage, and temperature of the test cell are detected by the power meter 4, the voltmeter 5, and the thermometer 6. To.

The power meter 4 integrates the amount of input power supplied from the power generation facility to the test cell and the amount of output power supplied from the test cell to the consumer, and outputs the integrated value to the battery management system (BMS) 7. do.

The voltmeter 5 detects the output voltage of the test cell and outputs it to the battery management system (BMS) 7.
The thermometer 6 detects the temperature of the test cell and outputs it to the battery management system (BMS) 7.

The power meter 4, the voltmeter 5, the thermometer 6, and the battery management system 7 are installed in the container 8 shown in FIG. 14 together with the storage battery rack 1.
The battery management system 7 is connected to the SOC determination unit 9 and the temperature determination unit 10. Then, the battery management system 7 outputs the SOC of the test cell to the SOC determination unit 9 based on the output signals of the wattmeter 4 and the voltmeter 5, and outputs the detected temperature signal output from the thermometer 6 to the temperature determination unit 9. Output to 10. SOC is a numerical value indicating the charge state of the storage battery cell, and is a numerical value indicating a ratio to the charge amount at the time of full charge.

The SOC determination unit 9 determines whether the input SOC value of the test cell is in the high deterioration SOC region or the low deterioration SOC region, and outputs the determination result to the control unit 11. In general, the charging operation in a state where the SOC value is high tends to deteriorate the storage battery cell, and whether it is a high deterioration SOC region or a low deterioration SOC region differs depending on the type of the storage battery cell.

For example, in the case of a storage battery cell in which deterioration is most likely to proceed when the SOC is 100%, a high deterioration SOC region is set when the SOC value is 80% or more, and a low deterioration SOC region is set when the SOC value is less than 80%. do.

Further, in the case of a storage battery cell in which deterioration is most likely to proceed when the SOC is 50%, a highly deteriorated SOC region is set when the SOC value is 40% or more and less than 60%, and the SOC value is less than 40% or 60% or more. When it is, it is set as a low deterioration SOC region.

The temperature determination unit 10 determines whether the detection value input from the thermometer 6 via the battery management system 7 is in the high deterioration temperature region or the low deterioration temperature region, and outputs the determination result to the control unit 11. do. Generally, when the storage battery cell is at a high temperature, deterioration is likely to proceed, and whether it is in the high deterioration temperature region or the low deterioration temperature region differs depending on the type of the storage battery cell.

Here, when the cell temperature of the test cell is 25 ° C. or higher, it is defined as a high deterioration temperature region, and when it is less than 25 ° C., it is defined as a low deterioration temperature region. Depending on the type of storage battery cell, 30 ° C. may be set as a threshold value.

An ambient thermometer 12 is connected to the temperature determination unit 10. The ambient thermometer 12 detects the ambient temperature of the storage battery rack 1 and outputs it to the temperature determination unit 10.
The temperature determination unit 10 determines whether the detection value input from the ambient thermometer 12 is in the high deterioration temperature region or the low deterioration temperature region, and outputs the determination result to the control unit 11. Generally, when the ambient temperature of the storage battery rack 1 is high, the storage battery cells in the storage battery rack 1 tend to reach the high deterioration temperature region.

Here, when the ambient temperature of the storage battery rack 1 is 25 ° C. or higher, the high deterioration temperature region is set, and when the ambient temperature is lower than 25 ° C., the low deterioration temperature region is set. Depending on the type of storage battery cell, 30 degrees may be set as the threshold value.

The control unit 11 is connected to the temperature control device 13, the energy management system (EMS) 14, and the power conditioner 2. The temperature control device 13 is an air conditioner and a cooling fan installed in the container 8 to control the room temperature in the container 8.

Then, the control unit 11 controls the operation of the temperature control device 13 based on the determination signals output from the SOC determination unit 9 and the temperature determination unit 10 and a preset program.
The energy management system 14 controls the operation of the stationary storage battery device with respect to the electric power system based on the communication with the control unit 11. Specifically, the charge / discharge prediction information set in advance is transmitted to the control unit 11, and the control unit 11 controls the power conditioner 2 based on the prediction information to control the charge / discharge operation of the storage battery rack 1.

Next, the operation of the stationary storage battery device configured as described above will be described.
FIG. 2 shows the operation of the control unit 11 that controls the operation of the temperature control device 13 based on the SOC of the storage battery cell in the storage battery rack 1 and the ambient temperature. Further, FIG. 3 shows the operation of the control unit 11 when waiting for the charging / discharging operation to the storage battery cell in the storage battery rack 1. In either case, the power consumption by the temperature control device 13 is reduced to reduce the load on the storage battery cell.

Incidentally, FIG. 12 shows the float charging characteristics of the lithium ion battery at 100% SOC. As is clear from the figure, the approximate straight lines A1 to A5 showing the relationship between the charging time and the discharge capacity retention rate at each temperature of 25 ° C, 40 ° C, 50 ° C, 60 ° C, and 70 ° C are inclined as the temperature increases. Becomes steep. This indicates that the higher the temperature, the faster the decrease in the discharge capacity retention rate, in other words, the higher the temperature, the easier the deterioration of the storage battery cell.

In FIG. 13, when the capacity retention rate of the storage battery cell of the lithium ion battery is 80%, the relationship between the SOC and the temperature and the time until the charging life is reached is an approximate straight line B1 to B3. Indicated by. The approximate straight line B1 has an SOC of 2%, the approximate straight line B2 has an SOC of 50%, and the approximate straight line B3 has an SOC of 100%.

As shown in the figure, it can be seen that when the battery temperature rises, the time until the charge life is reached becomes shorter, and when the SOC rises, the time until the charge life is reached becomes shorter.
Explaining the operation shown in FIG. 2, when the operation of the stationary storage battery device is started, the SOC state of the test cell is determined (step 1). That is, the SOC value of the test cell output from the battery management system 7 is determined by the SOC determination unit 9, and the determination result is output to the control unit 11.

When the SOC value of the test cell is in the highly deteriorated SOC region, the process proceeds to steps 2 and 3, and the control unit 11 controls the temperature control device 13 to preset the air conditioning temperature in the container 8. The temperature is lowered below the normal temperature, and the temperature is returned to step 1. In order to lower the temperature inside the container 8, the cooling device may be operated, or only the fan may be operated to introduce outside air into the container 8.

In step 1, when the SOC of the test cell is not a high-deteriorated SOC region but a low-degraded SOC region or an SOC region is determined in three stages, if it is in a low-degraded SOC region and an intermediate SOC region (step 1). 4, 5), the control unit 11 determines the ambient temperature of the storage battery rack 1 (step 6).

When the ambient temperature determined by the temperature determination unit 10 based on the detection signal of the ambient thermometer 12 is in the high deterioration temperature region (step 7), the control unit 11 controls the temperature control device 13 to control the container 8 The air-conditioning temperature in the room is lowered to a preset normal temperature or lower (step 8), and the process returns to step 1.

In step 6, when the ambient temperature is in the low deterioration temperature region (step 9), the cell temperature of the test cell is determined (step 10). That is, the cell temperature detection signal of the test cell detected by the thermometer 6 is output from the battery management system 7 to the temperature determination unit 10. Then, the temperature determination unit 10 determines whether the cell temperature of the test cell is in the low deterioration temperature region or the high deterioration temperature region, and the determination result is output to the control unit 11.

When the cell temperature of the test cell is in the high deterioration temperature region (step 11), the control unit 11 controls the temperature control device 13 to bring the air conditioning temperature in the container 8 to a preset normal temperature or lower. It is lowered (step 12) and returns to step 1.

When the cell temperature of the test cell is in the low deterioration temperature region in step 10 (step 13), the control unit 11 is scheduled to perform charge / discharge operation immediately after charging / discharging based on the charge / discharge information supplied from the energy management system 14. (Step 14).

If the charging / discharging operation is scheduled immediately after (step 15), the temperature of the storage battery cell is expected to rise, so that the air conditioning temperature in the container 8 is lowered to a preset normal temperature or lower (step 15). 16) Return to step 1.

In step 14, if the charging / discharging operation immediately after is not scheduled (step 17), the control unit 11 redetermines the SOC state of the test cell (step 18). Then, when the SOC state of the test cell is in the low deterioration SOC region (step 19), the control unit 11 stops the air conditioning operation by the temperature control device 13 (step 20), and returns to step 1.

In step 18, when the SOC state of the test cell is in the intermediate SOC region (step 21), the control unit 11 continues the air conditioning operation by the temperature control device 13 at a preset normal temperature (step 22). , Return to step 1.

Further, in step 9, when the ambient temperature is, for example, 10 ° C. or lower, the process proceeds to step 20 regardless of the SOC value of the storage battery cell, the cell temperature of the storage battery cell, and the charge / discharge current value, and the air conditioning operation is performed. May be stopped.

FIG. 3 shows an operation of controlling the SOC state of the storage battery cell of the storage battery rack 1 to a SOC value at which the storage battery cell is less likely to deteriorate and waiting when the stationary storage battery device is put into the standby state. Here, the standby state includes a case where the charge / discharge operation is not performed on the storage battery cell and a case where a slight charge / discharge operation is performed on the storage battery cell so as not to significantly change the SOC value.

8 and 9 show a control unit for making the storage battery cell of the stationary storage battery device, which is installed in the factory and operates so as to stabilize the power supply to the factory, stand by at an SOC value with little deterioration. The operation of 11 is shown.

FIG. 8 shows an operation when the storage battery rack 1 is configured with the storage battery cell having the least deterioration when the SOC value C1 is set to 60% during standby. As shown in the figure, from 10:00 to 16:00 when the power demand peaks in the factory, the storage battery rack 1 discharges the power system to supply power to the factory, and the power supply is stabilized. It is planned.

Since the power demand decreases after 16:00, the discharge from the storage battery rack 1 is stopped, and after 20:00, the charging current is supplied from the power system to the storage battery rack 1 to charge the storage battery cells in the storage battery rack 1. .. Then, when the SOC value C1 of the storage battery cell reaches 60%, charging is stopped and the standby state is entered.

After waiting with the SOC value C1 set to 60%, charging to the storage battery rack 1 starts around 6 o'clock when charging to 100% is completed during the time when the power demand is low and the power metered rate is low, and the SOC value C1 starts before 10 o'clock. Is charged until it reaches 100%. Then, the storage battery rack 1 is discharged from the storage battery rack 1 to the power system at the peak of the power demand.

By such an operation, the SOC value C1 of the storage battery cell in the storage battery rack 1 is maintained at 60% during standby from night to early morning, so that deterioration of the storage battery cell is suppressed.
FIG. 9 shows an operation when the storage battery rack 1 is configured with the storage battery cell having the least deterioration when the SOC value C2 is 30%. This is the same as in FIG. 8 except that the SOC value C2 during standby is set to 30%.

10 and 11 show control for making the storage battery cell of the stationary storage battery device, which is attached to the photovoltaic power generation facility and operates so as to stabilize the power supply to the power system, stand by at an SOC value with little deterioration. The operation of the unit 11 is shown.

FIG. 10 shows an operation when the storage battery rack 1 is configured with the storage battery cell having the least deterioration when the SOC value D1 is set to 60% during standby. As shown in the figure, from 6:00 to 18:00, a part of the generated power of the photovoltaic power generation facility is supplied via the power system to charge the storage battery cell in the storage battery rack 1, and if necessary. Charging power is supplied to the power system to stabilize the power supply by photovoltaic power generation. At this time, the storage battery cell is charged until the SOC value D1 exceeds 60%.

After 18:00 when the power supply from the solar power generation facility is cut off, the power system is supplied with power from other power generation facilities, and the charging power of the storage battery rack 1 is supplied to the power system, and the SOC value is 60%. It is discharged until it becomes. Then, when the SOC value D1 reaches 60%, the discharge from the storage battery rack 1 is stopped and the standby state is entered.

By such an operation, the SOC value D1 of the storage battery cell in the storage battery rack 1 is maintained at 60% during standby from night to early morning, so that deterioration of the storage battery cell is suppressed.
FIG. 11 shows an operation when the storage battery rack 1 is configured with the storage battery cell having the least deterioration when the SOC value D2 is 30%. This is the same as in FIG. 10 except that the SOC value D2 during standby is set to 30%.

As described above, the operation of the control unit 11 having a function of waiting in a state where the SOC value of the storage battery cell is maintained at the optimum SOC value with little deterioration will be described with reference to FIG.
When the operation of the stationary storage battery device is started, the control unit 11 is in a standby state in which the charge / discharge operation of the storage battery cell in the storage battery rack 1 is stopped based on the charge / discharge prediction information input from the energy management system 14. It is determined whether or not it is time (step 31).

For example, as shown in FIG. 8, when the charge / discharge operation for the storage battery cell is in the standby state between 22:00 and 6:00, it is determined that the charge / discharge state is not in the standby state at other times, and the charge / discharge for the storage battery cell is performed. The operation is continued (step 32), the air conditioning operation is continued (step 33), and the process returns to step 31.

The air-conditioning operation in step 33 is a control for determining the air-conditioning temperature and the continuation of the air-conditioning operation based on, for example, the SOC state shown in FIG.
When it is determined in step 31 that the state is in the standby state (step 34), the state of the SOC of the test cell is determined (step 35). That is, the SOC value of the test cell output from the battery management system 7 is determined by the SOC determination unit 9, and the determination result is output to the control unit 11.

When the SOC value of the test cell is in the high deterioration SOC region (step 36), the control unit 11 discharges the storage battery cell or discharges the storage battery so that the SOC value of the storage battery cell is in the low deterioration SOC region during standby. The cell is charged (step 37).

4 to 7 show an example of the charging / discharging operation of the storage battery cell in step 37. FIG. 4 shows a discharge operation in a stationary storage battery device installed alongside a photovoltaic power generation facility. By the operation of the control unit 11, power is supplied from the storage battery cell in the storage battery rack 1 to the power system via the power conditioner 2 and the grid interconnection equipment 3, and the storage battery cell is discharged. At this time, if the generated power is output from the photovoltaic power generation facility 15, the generated power is supplied from the photovoltaic power generation power conditioner 16 to the power system via the grid interconnection facility 3.

FIG. 5 shows a charging operation in a stationary storage battery device installed alongside a photovoltaic power generation facility. In the daytime, the electric power output from the photovoltaic power generation facility 15 via the photovoltaic power conditioner 16 is supplied to the storage battery rack 1 via the power conditioner 2 to charge the storage battery cell. The output power of the photovoltaic power generation facility 15 is also supplied to the consumer via the power system.

FIG. 6 shows a discharge operation in a stationary storage battery device installed in a factory and operating so as to stabilize the power supply supplied to the factory. By the operation of the control unit 11, electric power is supplied from the storage battery cell in the storage battery rack 1 to the load equipment 16a, 16b and the like in the factory via the power conditioner 2 and the grid interconnection equipment 3, and the storage battery cell is discharged. At this time, the required power is also supplied from the power system outside the factory to the load equipment 16a and 16b via the factory power receiving / transforming equipment 17.

FIG. 7 shows a charging operation in a stationary storage battery device installed in a factory and operating so as to stabilize the power supply supplied to the factory. By the operation of the control unit 11, charging power is supplied from the power system outside the factory to the storage battery rack 1 via the factory power receiving / transforming equipment 17, the grid interconnection equipment 3, and the power conditioner 2, and the storage battery cell in the storage battery rack 1 is charged. Will be done.

Further, electric power is supplied from the electric power system outside the factory to the load equipments 16a and 16b in the factory via the factory power receiving / transforming equipment 17.
When the SOC value of the test cell is in the low deterioration SOC region in step 35, or when the SOC value of the test cell is in the low deterioration SOC region in the charging operation or discharging operation of step 37, the process proceeds from step 38 to step 39. Then, the ambient temperature of the storage battery rack 1 is determined.

When the ambient temperature determined by the temperature determination unit 10 based on the detection signal of the ambient thermometer 12 is in the high deterioration temperature region (step 40), the control unit 11 continues the air conditioning operation by the temperature control device 13 (step 40). Step 41), the operation of returning to step 39 and determining the ambient temperature is repeated.

In step 39, when the ambient temperature is in the low deterioration temperature region (step 42), the cell temperature of the test cell is determined (step 43). That is, the temperature determination unit 10 determines whether the cell temperature of the test cell is in the low deterioration temperature region or the high deterioration temperature region, and the determination result is output to the control unit 11.

If the cell temperature of the test cell is in the low deterioration temperature region in step 43 (step 44), the air conditioning operation is stopped (step 45), and the process returns to step 31. If the cell temperature of the test cell is in the high deterioration temperature region in step 43 (step 46), the air conditioning operation is continued and the process returns to step 31.

As shown in FIG. 14, a solar heat absorbing device 18 made of vines is installed so as to cover the top surface and the side surface of the container 8 in which the storage battery rack 1 and the like are housed, particularly the side surface and the top surface facing the south side. The vines are preferably morning glory, bitter gourd, loofah, gourd, cucumber and the like.

Such a solar heat absorbing device 18 absorbs sunlight and heat rays irradiating the container 8. Then, the temperature rise in the container 8 is suppressed, and the temperature rise of the storage battery cell is also suppressed. Therefore, in step 10 shown in FIG. 2 and step 43 shown in FIG. 3, the frequency with which the cell temperature of the storage battery cell is determined to be in the high deterioration temperature region is reduced, so that the duration of the air conditioning operation can be suppressed. ..

With the stationary storage battery device configured as described above, the following effects can be obtained.
(1) The SOC value of the storage battery cell constituting the storage battery rack 1 in the container 8 and the ambient temperature of the storage battery rack 1 are monitored, and the SOC value is in the low deterioration SOC region and the ambient temperature is in the low deterioration temperature region. In that case, the operation of the temperature control device 13 in the container 8 can be suppressed. Therefore, the power consumption by the temperature control device 13 can be reduced.

(2) By reducing the power consumption of the temperature control device 13, it is possible to reduce the loss for operating the storage battery and improve the overall efficiency of the storage battery device.
(3) In addition to the SOC value of the storage battery cell and the ambient temperature of the storage battery rack 1, the cell temperature of the storage battery cell is monitored, and when the SOC value is in the high deterioration SOC region and the ambient temperature is in the high deterioration temperature region. Alternatively, the temperature control device 13 can lower the air conditioning temperature in the container 8 only when the cell temperature is in the high deterioration temperature region. Therefore, since the air conditioning temperature in the container 8 can be controlled as needed, the air conditioning operation can be efficiently performed and the power consumption of the temperature control device 13 can be suppressed.

(4) Based on the charge / discharge schedule preset in the energy management system 14, the control unit 11 can recognize whether or not the storage battery rack 1 is charged with a large current or the storage battery rack 1 is discharged with a large current. .. Then, when a large current is charged and discharged in the storage battery cell in the storage battery rack 1, the temperature control device 13 can lower the air conditioning temperature in the container 8. Therefore, since the air conditioning temperature in the temperature control device 13 can be controlled as needed, the air conditioning operation can be efficiently performed and the power consumption of the temperature control device 13 can be suppressed. Further, by cooling in advance, it is possible to suppress an increase in the battery temperature and extend the life of the storage battery cell.

(5) When the SOC value of the storage battery cell is in the low deterioration SOC region, the ambient temperature of the storage battery rack 1 is in the low deterioration temperature region, and a large current is not charged or discharged, the air conditioning operation by the temperature control device 13 is stopped. Therefore, the power consumption by the temperature control device 13 can be suppressed.

(6) In the standby state where the charging to the storage battery rack 1 and the discharge from the storage battery rack 1 are small, the storage battery cells are charged or charged so that the SOC value of the storage battery cells in the storage battery rack 1 is within the low deterioration SOC region. The storage battery cell can be discharged. Therefore, the life of the storage battery cell can be extended.

(7) Since the solar heat absorbing device 18 can block the sunlight and heat rays irradiating the container 8, it is possible to suppress the temperature rise in the container 8 and suppress the cell temperature rise. Therefore, the operating time of the temperature control device 13 can be reduced, and the power consumption by the temperature control device 13 can be reduced.

The above embodiment may be changed as follows.
-Ambient thermometers are installed not only around the storage battery rack, but also around the container, around the storage battery module, or around the storage battery cell selected in advance, and the ambient temperature detected by these ambient temperature meters is low. It may be determined whether it is a deterioration temperature region or a high deterioration temperature region.

-In order to adjust the air conditioning temperature, the air conditioning temperature may be adjusted by installing a plurality of air conditioners in the container and selecting the number of air conditioners to be operated.
-A solar panel may be installed so as to block the irradiation of sunlight on the container to serve as a solar heat absorber.

1 ... Storage battery (storage battery rack), 4 ... Charging state detecting means (power meter), 5 ... Charging state detecting means (voltage meter), 6 ... Cell temperature detecting means (thermometer), 8 ... Stationary storage device (container) , 9 ... Charge state detection means (SOC determination unit), 10 ... Ambient temperature detection means (cell temperature detection means, temperature determination unit), 11 ... Control unit, 12 ... Ambient temperature detection means (ambient thermometer), 13 ... Temperature Control device, 18 ... Solar heat absorber.

Claims (8)

In the stationary storage battery device that charges the storage battery installed in the stationary storage device with the electric power supplied from the electric power system and supplies the electric power charged in the storage battery to the electric power system.
An ambient temperature detecting means for detecting whether the ambient temperature of the storage battery is in the high deterioration temperature region or the low deterioration temperature region of the storage battery, and
A charging state detecting means for detecting whether the charging state of the storage battery is a high deterioration charging region or a low deterioration charging region of the storage battery, and
A temperature control device that adjusts the room temperature in the stationary storage device,
A stationary storage battery device including a control unit that operates the temperature control device as needed based on the detection results of the ambient temperature detecting means and the charging state detecting means. In the stationary storage battery device according to claim 1,
A cell temperature detecting means for detecting whether the cell temperature of the storage battery is in the high deterioration temperature region or the low deterioration temperature region is provided.
The control unit is a stationary storage battery characterized in that the temperature control device is operated as necessary based on the detection results of the ambient temperature detecting means, the charging state detecting means, and the cell temperature detecting means. Device. In the stationary storage battery device according to claim 2.
The control unit stops the operation of the temperature control device when the ambient temperature is in the low deterioration temperature region, the charging state is in the low deterioration charging region, and the cell temperature is in the low deterioration temperature region. A stationary storage battery device characterized by this. In the stationary storage battery device according to claim 3,
A prediction information management means for outputting charge / discharge prediction information for the storage battery to the control unit is provided.
The control unit predicts that the ambient temperature is in the low deterioration temperature region, the charging state is in the low deterioration charging region, the cell temperature is in the low deterioration temperature region, and a large current is charged and discharged to the storage battery. A stationary storage battery device characterized in that the operation of the temperature control device is stopped when there is no information. In the stationary storage battery device according to claim 4.
The control unit has a large current to the storage battery when the ambient temperature is in the high deterioration temperature region, when the charging state is in the high deterioration charging region, when the cell temperature is in the high deterioration temperature region, or when the cell temperature is in the high deterioration temperature region. A stationary storage battery device, characterized in that the temperature control device is operated to lower the room temperature in the stationary storage device when there is predictive information for charging / discharging. In the stationary storage battery device according to claim 4 or 5.
The control unit is characterized in that the charging state of the storage battery in the highly deteriorated charging region is charged or discharged until it reaches the low deterioration charging region, based on the standby information output from the prediction information management means. Stationary storage battery device. In the stationary storage battery device according to any one of claims 1 to 6.
A stationary storage battery device characterized by installing a solar heat absorbing device that blocks sunlight irradiated to the stationary accommodating device. Whether the ambient temperature of the storage battery installed in the stationary storage device is the high deterioration temperature region or the low deterioration temperature region of the storage battery is detected by the ambient temperature detecting means, and whether the charging state of the storage battery is the high deterioration charging region of the storage battery. If necessary, a temperature control device that detects whether it is a low-deterioration charging area by the charging state detecting means and adjusts the room temperature in the stationary accommodating device based on the detection results of the ambient temperature detecting means and the charging state detecting means. A control method for a stationary storage battery device, which is characterized by operating the battery.

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