Energy storage battery cabinet cold and heat storage system and method

Abstract

The present application relates to the technical field of electrochemical energy storage, and discloses a cold and heat storage system for an energy storage battery cabinet, which comprises a circulating pipeline and a liquid cooling unit, the liquid cooling unit can independently dissipate heat or supply heat to the battery cells in a plurality of battery packs through the circulating pipeline, and further comprises a phase change heat storage device and a phase change cold storage device, the phase change heat storage device can independently dissipate heat to the battery cells in the plurality of battery packs through the circulating pipeline, and can absorb and store the heat generated by the battery cells in the plurality of battery packs or supply heat to the battery cells in the plurality of battery packs, the phase change cold storage device can independently dissipate heat to the battery cells in the plurality of battery packs through the circulating pipeline, and the phase change heat storage device, the phase change cold storage device and the liquid cooling unit can cooperate to dissipate heat to the battery cells in the plurality of battery packs through the circulating pipeline, absorb and store the heat generated by the battery cells, or supply heat to the battery cells in the plurality of battery packs. The present application can make full use of the heat generated by the energy storage battery cabinet during operation and the cold energy in the environment where the energy storage battery cabinet is located, reduce the use of the liquid cooling unit, save power and reduce the use cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrochemical energy storage, in particular to a cold and heat storage system and method for an energy storage battery cabinet. BACKGROUND

[0002] The energy storage battery cabinet is used for storing and releasing electric energy when needed. When the energy storage battery cabinet is charging and discharging, a large amount of heat is generated in the electric cells in the multiple battery packs in the energy storage battery cabinet. In order to ensure the normal operation of the electric cells, the electric cells need to be cooled or heated. When the ambient temperature is low, the temperature of the electric cells decreases, and the electric cells need to be heated.

[0003] In northern or northwestern regions, the temperature difference between day and night is large, and the temperature difference between day and night can reach more than 10 degrees Celsius. In addition, there are several months in a year when the temperature difference between day and night is large. During the day, the ambient temperature is high, and the temperature of the electric cells is high. Therefore, a liquid cooling unit is needed to cool the electric cells. At night, the ambient temperature is low, and the temperature of the electric cells is low. Therefore, a liquid cooling unit is needed to heat the electric cells. The large amount of heat generated by the electric cells during the day is exactly the heat needed by the electric cells at night. The cold in the environment at night is exactly the cold needed by the electric cells during the day. In order to make full use of the heat generated by the energy storage battery cabinet during operation and the cold in the environment, reduce the use of the liquid cooling unit, save electricity, and save use cost, an energy storage battery cabinet cold and heat storage system that can absorb and store the heat generated by the electric cells for heating the electric cells and absorb and store the cold in the environment for cooling the electric cells is urgently needed. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, one of the purposes of the present application is to provide an energy storage battery cabinet cold and heat storage system that can make full use of the heat generated by the energy storage battery cabinet during operation and the cold in the environment, reduce the use of the liquid cooling unit, save electricity, and save use cost.

[0005] The technical scheme adopted by the present application is as follows: an energy storage battery cabinet cold and heat storage system, comprising a circulating pipeline for cooling liquid flow, a liquid cooling unit for heating or cooling the electric cells in the multiple battery packs, the liquid cooling unit can independently cool or heat the electric cells in the multiple battery packs through the circulating pipeline, further comprising a phase change heat storage device for absorbing and storing the heat generated by the electric cells and a phase change cold storage device for absorbing and storing the cold in the environment, the phase change heat storage device can independently cool the electric cells in the multiple battery packs through the circulating pipeline and absorb and store the heat generated by the electric cells in the multiple battery packs, or heat the electric cells in the multiple battery packs, the phase change heat storage device can independently cool the electric cells in the multiple battery packs through the circulating pipeline, and the phase change heat storage device, the phase change cold storage device, and the liquid cooling unit can cooperate to cool the electric cells in the multiple battery packs through the circulating pipeline, absorb and store the heat generated by the electric cells in the multiple battery packs, or heat the electric cells in the multiple battery packs.

[0006] Compared with the prior art, the application has the following advantages:

[0007] 1) The phase change heat storage device of the application can absorb and store the heat generated by multiple battery cells, dissipate heat for the battery cells, and also can supply heat for the battery cells after storing heat. The phase change cold storage device can absorb and store the cold generated in the environment, dissipate heat for the battery cells, and the liquid cooling unit can dissipate or supply heat for the battery cells. In the circulating pipeline, through the cooperation of the phase change heat storage device, the phase change cold storage device and the liquid cooling unit, the heat generated by the energy storage battery cabinet itself and the cold in the environment of the energy storage battery cabinet can be fully utilized, and multiple modes can be used to dissipate or supply heat for the battery cells, such as the mode of separate operation of the phase change heat storage device, the phase change cold storage device and the liquid cooling unit, the mode of cooperation of the phase change heat storage device and the phase change cold storage device, the phase change heat storage device and the liquid cooling unit, and the phase change cold storage device and the liquid cooling unit, that is, multiple choices can be used to dissipate or supply heat for the battery cells, and the use of the liquid cooling unit can be reduced. In the north or northwest region, the temperature difference between day and night is large, and the temperature difference between day and night can reach more than 10 degrees Celsius. For example, in summer, the daytime temperature in some areas is more than 30 degrees, and the nighttime temperature is more than 10 degrees. In winter, the daytime temperature in some areas is a few degrees, and the nighttime temperature is minus 10 degrees. If a liquid cooling unit is used to supply heat to the energy storage battery cabinet every hour, the required power is 2 degrees, and one day requires 48 degrees. In a year, the number of days with large temperature difference between day and night is 90 to 365 days. The energy storage battery cabinet can absorb and store the heat required for the energy storage battery cabinet in one day. Except for the 8 degrees of electricity consumed by the liquid cooling unit for four hours of heat dissipation or supply for the battery cells during the two charging processes, 40 degrees of electricity is saved in one day through multiple modes of heat dissipation or supply for the battery cells. In the days with large temperature difference between day and night in a year, 3600 degrees to 14600 degrees of electricity can be saved, which can save electricity and reduce the use cost.

[0008] 2) Multiple modes of heat dissipation or supply for the battery cells can prevent single heat supply or dissipation mode, ensure effective heat dissipation or supply for the energy storage battery cabinet, improve charging or power supply efficiency, and in the case of high ambient temperature and high battery cell temperature, the original liquid cooling unit can efficiently dissipate heat for the battery cells, improve heat exchange efficiency, and keep the fan in the condenser at high speed, resulting in high noise. Through the cooperation of the phase change heat storage device and the liquid cooling unit, the fan in the condenser can be kept at low speed without the need to improve the heat exchange efficiency, which can reduce the energy consumption of the liquid cooling unit and the noise generated by the liquid cooling unit.

[0009] As a preferred embodiment of the present application, it further comprises a first heat exchanger for absorbing and storing environmental cold energy, a control module for controlling the opening and closing of the liquid cooling unit, the phase change heat storage device and the phase change cold storage device respectively, a first detection module for detecting the temperature of the battery cell in the battery pack, a second detection module for detecting the temperature of the cooling liquid between the first liquid outlet main pipeline and the phase change heat storage device, a third detection module for detecting the environmental temperature, and a fourth detection module for detecting the temperature of the phase change cold storage material, wherein the first detection module, the second detection module, the third detection module and the fourth detection module are used to transmit the detected temperature information to the control module.

[0010] When the control module receives temperature information from the first detection module that is lower than a preset first temperature threshold, the control module controls the liquid cooling unit to start, and the liquid cooling unit supplies heat to the battery cells in the battery pack through the circulating pipeline.

[0011] When the liquid cooling unit supplies heat to the battery cells, the control module receives temperature information from the third detection module that is lower than a preset second temperature threshold, and the control module controls the first heat exchanger and the phase change cold storage device to start, and the first heat exchanger and the phase change cold storage device absorb and store cold energy in the environment through the circulating pipeline.

[0012] When the control module receives temperature information from the first detection module that is higher than a preset first temperature threshold, and the control module receives temperature information from the fourth detection module that is lower than a preset third temperature threshold, the control module controls the phase change cold storage device to start, and the phase change cold storage device dissipates heat for the battery cells in the battery pack through the circulating pipeline.

[0013] When the control module receives temperature information from the second detection module that is higher than a preset fourth temperature threshold, the control module controls the phase change cold storage device to close and the phase change heat storage device to start, and the phase change heat storage device dissipates heat for the battery cells through the circulating pipeline and simultaneously absorbs and stores the heat generated by the battery cells.

[0014] In the scheme, the first temperature threshold is a normal working temperature threshold of the battery cell, the second temperature threshold is a phase change temperature threshold of the phase change cold storage material, the third temperature threshold is a temperature threshold when the cooling liquid is used for heat dissipation, and the fourth temperature threshold is a phase change temperature threshold of the phase change heat storage material; when the control module receives temperature information of the first detection module lower than the preset normal working temperature threshold of the battery cell, the control module controls the liquid cooling unit to start, and the liquid cooling unit supplies heat to the battery cell through the circulating pipeline; when the liquid cooling unit supplies heat to the battery cell, if the control module receives temperature information of the third detection module lower than the preset phase change temperature threshold of the phase change cold storage material, that is, the ambient temperature is lower than the phase change temperature threshold of the phase change cold storage material, the control module controls the first heat exchanger and the phase change cold storage device to start, and the first heat exchanger and the phase change cold storage device absorb and store the cold quantity in the environment through the circulating pipeline; when the control module receives temperature information of the first detection module higher than the preset normal working temperature threshold of the battery cell, the control module controls the phase change cold storage device to start, and the liquid cooling unit is not started at this time; when the phase change cold storage device supplies heat to the battery cell, the control module receives temperature information of the second detection module higher than the preset phase change temperature threshold of the phase change heat storage material, the control module controls the phase change cold storage device to be closed and the phase change heat storage device to be started, and the phase change heat storage device absorbs and stores the heat generated by the battery cell through the circulating pipeline and supplies heat to the battery cell.

[0015] Beneficial effects: the liquid cooling unit, the phase change cold storage device and the phase change heat storage device are cooperated in a motorized manner, the use of the liquid cooling unit is reduced, the heat generated by the multiple battery cells in the energy storage battery cabinet and the cold quantity in the environment of the energy storage battery cabinet are fully utilized, the emission of heat is effectively reduced, and the environment is friendly.

[0016] As a preferred embodiment of the application, a fifth detection module for detecting the temperature of the cooling liquid between the phase change heat storage device and the phase change cold storage device is further included, and the fifth detection module is used for transmitting the detected temperature information to the control module.

[0017] When the phase change heat storage device is started to supply heat to the battery cell, the control module receives temperature information of the fifth detection module higher than the preset third temperature threshold, and receives temperature information of the fourth detection module lower than the preset third temperature threshold, the control module controls the phase change cold storage device to be started, and the phase change heat storage device and the phase change cold storage device cooperate to supply heat to the battery cell through the circulating pipeline.

[0018] In the scheme, the third temperature threshold is the temperature threshold of the cooling liquid for heat dissipation, when the phase change heat storage device is started for heat dissipation of the battery cell, the control module receives the temperature information of the fifth detection module higher than the preset temperature threshold of the cooling liquid for heat dissipation, and receives the temperature information of the fourth detection module lower than the preset temperature threshold of the cooling liquid for heat dissipation, that is, the temperature of the phase change cold storage material is lower than the temperature threshold of the cooling liquid for heat dissipation, the phase change cold storage device is started to dissipate heat for the cooling liquid again, so that the cooling liquid reaches the required temperature for heat dissipation of the battery cell.

[0019] (Phase change heat storage device, phase change cold storage device can be fully utilized, and use of the liquid cooling unit is reduced)

[0020] As a preferred embodiment of the application, a sixth detection module for detecting the temperature of the cooling liquid between the phase change heat storage device and the liquid cooling unit is further included, and the sixth detection module is used to transmit the detected temperature information to the control module.

[0021] When the phase change heat storage device is started for heat dissipation of the battery cell, the control module receives the temperature information of the sixth detection module higher than the preset third temperature threshold, the control module controls the liquid cooling unit to start, and the phase change heat storage device and the liquid cooling unit cooperate to dissipate heat for the battery cell through the circulating pipeline.

[0022] In the scheme, the third temperature threshold is the temperature threshold of the cooling liquid for heat dissipation, when the phase change heat storage device is started for heat dissipation of the battery cell, the control module receives the temperature information of the sixth detection module higher than the preset temperature threshold of the cooling liquid for heat dissipation, and the liquid cooling unit is started for heat dissipation of the cooling liquid again, so that the cooling liquid reaches the required temperature for heat dissipation of the battery cell.

[0023] As a preferred embodiment of the application, a seventh detection module for detecting the temperature of the phase change heat storage material is further included, and the seventh detection module is used to transmit the detected temperature information to the control module, and the control module is further used to control the fan speed gear of the condenser.

[0024] When the liquid cooling unit is started for heat dissipation of the battery cell, the control module receives the temperature information of the third detection module higher than the preset fifth temperature threshold, and receives the temperature information of the seventh detection module lower than the preset sixth temperature, and receives the temperature information of the second detection module higher than the preset fourth temperature threshold, the control module controls the phase change heat storage device to start, and controls the fan in the condenser of the liquid cooling unit to keep a low speed gear, and the liquid cooling unit and the phase change heat storage device cooperate to dissipate heat for the battery cell through the circulating pipeline.

[0025] In the scheme, the fifth temperature threshold is an ambient general temperature threshold, the sixth temperature is a phase change heat storage material temperature, the fourth temperature threshold is a phase change heat storage material phase change temperature threshold, the control module receives temperature information of the third detection module higher than the preset ambient general temperature threshold, receives temperature information of the seventh detection module lower than the preset phase change heat storage material temperature, and receives temperature information of the second detection module higher than the preset phase change heat storage material phase change temperature threshold, that is, the ambient temperature is relatively high, the heat storage amount in the phase change heat storage device is relatively low or can continue to store heat, and the temperature of the cooling liquid flowing out of the battery pack for cell heat dissipation is higher than the preset phase change heat storage material phase change temperature threshold, and the original liquid cooling unit has been started for cell heat dissipation, and the phase change heat storage device can prevent the fan in the condenser from running at a high speed to improve the heat dissipation efficiency, resulting in a large noise.

[0026] As a preferred embodiment of the application, an eighth detection module for detecting the temperature of the phase change heat storage material is further included, and the eighth detection module is configured to transmit the detected temperature information to the control module.

[0027] When the control module receives temperature information of the eighth detection module higher than the preset seventh temperature threshold and receives temperature information of the first detection module lower than the preset first temperature threshold, the control module controls the phase change heat storage device to start, and the phase change heat storage device supplies heat to the plurality of cells through the circulating pipeline.

[0028] In the scheme, the seventh temperature threshold is a cooling liquid temperature threshold for heat supply, and the first temperature threshold is a cell normal working temperature threshold, that is, the phase change heat storage device stores heat, and the phase change heat storage device starts to supply heat to the plurality of cells.

[0029] Beneficial effect: In the heat supply, in addition to the liquid cooling unit for supplying heat to the cells, the phase change heat storage device can also be used to supply heat to the cells, reducing the use of the liquid cooling unit.

[0030] As a preferred embodiment of the application, a thermistor is further included, a ninth detection module for detecting the temperature of the cooling liquid between the phase change heat storage device and the thermistor is further included, the ninth detection module is configured to transmit the detected temperature information to the control module, and the control module is further configured to control the thermistor to be connected or disconnected with the power supply.

[0031] When the phase change heat storage device starts to supply heat to the plurality of cells, the control module receives temperature information of the ninth detection module lower than the preset seventh temperature threshold, the control module controls the thermistor to be connected with the power supply, and the phase change heat storage device and the thermistor cooperate to supply heat to the plurality of cells through the circulating pipeline.

[0032] In the scheme, the seventh temperature threshold is the temperature threshold when the cooling liquid is used for heating, that is, after the phase change heat storage device is started for a period of time to heat the plurality of battery cells, the heat stored in the phase change heat storage device is reduced, at this time, the thermistor is used to heat the cooling liquid passing through the phase change heat storage device again, so that the temperature of the cooling liquid reaches the required temperature when the battery cells are heated.

[0033] Beneficial effect: the thermistor can assist the phase change heat storage device to heat the cooling liquid, and ensure that the cooling liquid can effectively heat the battery cells.

[0034] As a preferred embodiment of the application, a tenth detection module for detecting the temperature of the cooling liquid between the phase change heat storage device and the liquid cooling unit is further included, and the tenth detection module is used to transmit the detected temperature information to the control module.

[0035] When the phase change heat storage device is started to heat the plurality of battery cells, the control module receives the temperature information of the tenth detection module below the preset seventh temperature threshold, the control module controls the liquid cooling unit to start, and the phase change heat storage device and the liquid cooling unit cooperate to heat the plurality of battery cells through the circulating pipeline.

[0036] In the scheme, the seventh temperature threshold is the temperature threshold when the cooling liquid is used for heating, that is, after the phase change heat storage device is started for a period of time to heat the plurality of battery cells, the heat stored in the phase change heat storage device is reduced, at this time, the thermistor is used to heat the cooling liquid passing through the phase change heat storage device again, so that the temperature of the cooling liquid reaches the required temperature when the battery cells are heated.

[0037] Beneficial effect: the thermistor can assist the phase change heat storage device to heat the cooling liquid, and ensure that the cooling liquid can effectively heat the battery cells.

[0038] As a preferred embodiment of the application, a plurality of battery packs located in the energy storage battery cabinet, a first liquid inlet main pipeline provided on the circulating pipeline for providing the plurality of battery packs in the energy storage battery cabinet with cooling liquid, a first liquid outlet main pipeline for receiving the cooling liquid flowing out of the plurality of battery packs in the energy storage battery cabinet, a first branch pipeline connected in parallel with the phase change heat storage device, a second branch pipeline connected in parallel with the phase change heat storage device, and a third branch pipeline connected in parallel with the liquid cooling unit, and a first valve for controlling the cooling liquid to flow through the phase change heat storage device, a second valve located on the first branch pipeline, a third valve for controlling the cooling liquid to flow through the phase change heat storage device, a fourth valve located on the second branch pipeline, a fifth valve located on the third branch pipeline, and a seventh valve for controlling the cooling liquid to flow through the liquid cooling unit are further included.

[0039] The plurality of battery packs are respectively connected with a first liquid inlet main pipe and a first liquid outlet main pipe, the first branch pipe is connected with one end of the phase change heat storage device in parallel and then is connected with the first liquid outlet main pipe, the other end of the first branch pipe is connected with the first intermediate pipe in parallel, the second branch pipe is connected with one end of the phase change cold storage device in parallel and then is connected with the first intermediate pipe, the other end of the second branch pipe is connected with the second intermediate pipe in parallel, the third branch pipe and the liquid cooling unit are connected with one end of the second intermediate pipe in parallel, and the other end of the third branch pipe is connected with the first liquid inlet main pipe in parallel, and the second intermediate pipe is provided with a water pump.

[0040] The second purpose of the application is to provide a cold and heat storage method of the energy storage battery cabinet, which comprises the cold and heat storage system of the energy storage battery cabinet and the following steps.

[0041] S1: when the temperature information of the first detection module received by the control module is lower than the preset first temperature threshold value, the control module controls the liquid cooling unit to start, and the liquid cooling unit supplies heat to the battery cells in the plurality of battery packs through the circulating pipeline;

[0042] S2: when the liquid cooling unit continues to supply heat to the battery cells, the temperature information of the third detection module received by the control module is lower than the preset second temperature threshold value, the control module controls the phase change cold storage device and the first heat exchanger to start, and the phase change cold storage device and the first heat exchanger absorb and store the cold energy in the environment through the circulating pipeline;

[0043] S3: when the temperature information of the first detection module received by the control module is higher than the preset first temperature threshold value, the control module controls the phase change cold storage device to start and the liquid cooling unit to stop, and the phase change cold storage device dissipates heat to the battery cells through the circulating pipeline;

[0044] S4: when the phase change cold storage device continues to dissipate heat to the battery cells, the temperature information of the second detection module received by the control module is higher than the preset fourth temperature threshold value, the control module controls the phase change cold storage device to stop and the phase change heat storage device to start, and the phase change heat storage device absorbs and stores the heat generated by the plurality of battery cells and dissipates heat to the battery cells through the circulating pipeline;

[0045] S5: when the phase change heat storage device continues to absorb and store the heat generated by the plurality of battery cells and dissipate heat to the battery cells, the temperature information of the fifth detection module received by the control module is higher than the preset third temperature threshold value, and the temperature information of the fourth detection module received by the control module is lower than the preset third temperature threshold value, the control module controls the phase change cold storage device to start, and the phase change heat storage device and the phase change cold storage device cooperate to absorb and store the heat generated by the plurality of battery cells and dissipate heat to the battery cells through the circulating pipeline;

[0046] Or the phase change heat storage device continuously absorbs and stores the heat generated by the plurality of battery cells, and the control module receives the temperature information of the sixth detection module higher than the preset third temperature threshold, the control module controls the liquid cooling unit to start, and the phase change heat storage device and the liquid cooling unit cooperate to absorb and store the heat generated by the plurality of battery cells through the circulating pipeline, and the battery cells are cooled;

[0047] S6: When the control module receives the temperature information of the first detection module lower than the preset first temperature threshold, and receives the temperature information of the eighth detection module higher than the preset seventh temperature threshold, the control module controls the phase change heat storage device to start, and the phase change heat storage device supplies heat to the plurality of battery cells through the circulating pipeline;

[0048] S7: When the phase change heat storage device continuously supplies heat to the plurality of battery cells, the control module receives the temperature information of the ninth detection module higher than the preset seventh temperature threshold, the control module controls the thermistor to be connected with the power supply, and the thermistor and the phase change heat storage device cooperate to supply heat to the plurality of battery cells through the circulating pipeline;

[0049] Or when the phase change heat storage device continuously supplies heat to the plurality of battery cells, the control module receives the temperature information of the tenth detection module higher than the preset seventh temperature threshold, the control module controls the liquid cooling unit to start, and the phase change heat storage device and the liquid cooling unit cooperate to supply heat to the plurality of battery cells through the circulating pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 is the control flow chart of the energy storage battery cabinet cold and heat storage system of the present application;

[0051] Figure 2 is the cooling liquid flow route schematic diagram in the energy storage battery cabinet cold and heat storage system of the present application. DETAILED DESCRIPTION

[0052] The typical embodiments embodying the features and advantages of the present application will be described in detail in the following description. It should be understood that the present application can have various changes on different embodiments, which all do not deviate from the scope of the present application, and the description and drawings in essence are used as illustration, not to limit the present application.

[0053] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0054] The reference signs include: liquid cooling unit 1, phase change heat storage device 2, phase change cold storage device 3, first heat exchanger 4, thermistor 5, first liquid inlet main pipeline 6, battery pack 7, first liquid outlet main pipeline 8, first branch pipeline 9, second branch pipeline 10, third branch pipeline 11, first valve 12, second valve 13, third valve 14, fourth valve 15, fifth valve 16, sixth valve 17, seventh valve 18, eighth valve 19, water pump 20.

[0055] Energy storage battery cabinet cold and hot storage system, such as Figure 2 As shown, the system includes a circulation pipeline for coolant flow, a liquid cooling unit 1 for heating or cooling the cells within multiple battery packs 7, a phase change thermal storage device 2 for absorbing heat generated by the stored cells, a phase change cold storage device 3 for absorbing cold energy in the storage environment, a first heat exchanger 4 for absorbing cold energy in the storage environment, a thermistor 5 connected in parallel with the liquid cooling unit 1, and multiple battery packs 7 located within the energy storage battery cabinet. The circulation pipeline includes a first main inlet pipe 6 for supplying coolant to the multiple battery packs 7 within the energy storage battery cabinet, a first main outlet pipe 8 for receiving coolant flowing out of the multiple battery packs 7 within the energy storage battery cabinet, and a first branch pipe 9 connected in parallel with the phase change thermal storage device 2. The system includes a second branch pipe 10 connected in parallel with the phase change heat storage device 3, a third branch pipe 11 connected in parallel with the thermistor 5 and the liquid cooler unit 1, a first valve 12 for controlling the flow of coolant through the phase change heat storage device 2, a second valve 13 located on the first branch pipe 9, a third valve 14 for controlling the flow of coolant through the phase change heat storage device 3, a fourth valve 15 located on the second branch pipe 10, a fifth valve 16 located on the third branch pipe 11, a sixth valve 17 for controlling the flow of coolant through the thermistor 5, a seventh valve 18 for controlling the flow of coolant through the liquid cooler unit 1, and an eighth valve 19 for controlling the flow of coolant out of the first heat exchanger 4 and the phase change heat storage device.

[0056] Multiple battery packs 7 are connected to the first liquid inlet main pipe 6 and the first liquid outlet main pipe 8 respectively. One end of the first branch pipe and the parallel line of the phase change heat storage device 2 are connected to the first liquid outlet main pipe 8, and the other end is connected in parallel and then converges to the first intermediate pipe. One end of the phase change cold storage device 3 and the first heat exchanger 4 are connected in parallel and then converge to the first branch pipe, and the other end is connected in parallel and then converges to the second branch pipe. The third valve 14 is located on the first branch pipe, and the eighth valve 19 is located on the second branch pipe. One end of the first branch pipe and the second branch pipe 10 are connected in parallel and then connected to the first intermediate pipe, and the other end is connected in parallel and then converges to the second intermediate pipe. One end of the third branch pipe 11, the thermistor 5, and the liquid cooling unit 1 are connected in parallel and then converge to the second intermediate pipe, and the other end is connected in parallel and then converges to the first liquid inlet main pipe 6. A water pump 20 is installed on the second intermediate pipe.

[0057] In this embodiment, a first circuit for heating or cooling the cells inside the multiple battery packs 7 is formed by sequentially connecting multiple battery packs 7, a first liquid outlet main pipe 8, a first branch pipe 9, a second valve 13, a first intermediate pipe, a second branch pipe 10, a fourth valve 15, a second intermediate pipe, a water pump 20, a liquid cooling unit 1, a seventh valve 18, and a first liquid inlet main pipe 6.

[0058] The second circuit for absorbing and storing cold in the environment is formed by connecting the phase change cold storage device 3 and the first heat exchanger 4;

[0059] The third circuit for dissipating heat from the battery cells in the plurality of battery packs 7 is formed by sequentially connecting the plurality of battery packs 7, the first liquid outlet main pipeline 8, the first branch pipeline 9, the second valve 13, the first intermediate pipeline, the first branch pipeline, the third valve 14, the phase change cold storage device 3, the second branch pipeline, the eighth valve 19, the second intermediate pipeline, the water pump 20, the third branch pipeline 11, the fifth valve 16, and the first liquid inlet main pipeline 6.

[0060] The fourth circuit for dissipating heat from the battery cells in the plurality of battery packs 7 is formed by sequentially connecting the plurality of battery packs 7, the first liquid outlet main pipeline 8, the first branch pipeline 9, the second valve 13, the first intermediate pipeline, the first branch pipeline, the third valve 14, the phase change cold storage device 3, the second branch pipeline, the eighth valve 19, the second intermediate pipeline, the water pump 20, the liquid cooling unit 1, the seventh valve 18, and the first liquid inlet main pipeline 6.

[0061] The sixth circuit for absorbing and storing heat generated by the battery cells in the plurality of battery packs 7 and dissipating heat from the battery cells is formed by sequentially connecting the plurality of battery packs 7, the first liquid outlet main pipeline 8, the first valve 12, the phase change heat storage device 2, the first intermediate pipeline, the first branch pipeline, the third valve 14, the phase change cold storage device 3, the second branch pipeline, the eighth valve 19, the second intermediate pipeline, the water pump 20, the third branch pipeline 11, the fifth valve 16, and the first liquid inlet main pipeline 6.

[0062] The sixth circuit for absorbing and storing heat generated by the battery cells in the plurality of battery packs 7 and dissipating heat from the battery cells is formed by sequentially connecting the plurality of battery packs 7, the first liquid outlet main pipeline 8, the first valve 12, the phase change heat storage device 2, the first intermediate pipeline, the first branch pipeline, the third valve 14, the phase change cold storage device 3, the second branch pipeline, the eighth valve 19, the second intermediate pipeline, the water pump 20, the third branch pipeline 11, the fifth valve 16, and the first liquid inlet main pipeline 6.

[0063] The seventh circuit for dissipating heat from the battery cells is formed by sequentially connecting the plurality of battery packs 7, the first liquid outlet main pipeline 8, the first valve 12, the phase change heat storage device 2, the first intermediate pipeline, the second branch pipeline 10, the fourth valve 15, the second intermediate pipeline, the water pump 20, the thermistor 5, the sixth valve 17, and the first liquid inlet main pipeline 6.

[0064] The eighth circuit for absorbing and storing heat generated by the battery cells in the plurality of battery packs 7 and dissipating or supplying heat to the battery cells is formed by sequentially connecting the plurality of battery packs 7, the first liquid outlet main pipeline 8, the first valve 12, the phase change heat storage device 2, the first intermediate pipeline, the second branch pipeline 10, the fourth valve 15, the second intermediate pipeline, the water pump 20, the liquid cooling unit 1, the seventh valve 18, and the first liquid inlet main pipeline 6.

[0065] In this embodiment, the circulating pipeline circulates cooling liquid, and the cooling liquid is a mixture of water and ethylene glycol. Since it is cooling liquid, the phase change heat storage device 2 and the phase change cold storage device 3 can be directly connected to the circulating pipeline, without the need for a heat exchanger, thereby improving the heat exchange efficiency between the cooling liquid and the phase change heat storage device 2 and the cooling liquid and the phase change cold storage device 3.

[0066] The liquid cooling unit 1 includes a compressor, a condenser, an expansion valve, and a second heat exchanger. The condenser includes a fan for heat dissipation. The compressor, the condenser, the expansion valve, and the second heat exchanger are sequentially connected to form a circuit for circulating refrigerant. The cooling liquid circulating in the circulating pipeline and passing through the liquid cooling plate to heat or cool the battery cells exchanges heat with the refrigerant through the second heat exchanger. In this embodiment, the refrigerant can be R410A.

[0067] As shown in FIG. 1, Figure 1 The control module is further configured to control the fan speed of the condenser, and to control the connection or disconnection of the thermistor 5 and the power supply.

[0068] In this embodiment, the control module is further configured to control the fan speed of the condenser, and to control the connection or disconnection of the thermistor 5 and the power supply.

[0069] The first detection module, the second detection module, the third detection module, the fourth detection module, the fifth detection module, the sixth detection module, the seventh detection module, the eighth detection module, the ninth detection module, and the tenth detection module are configured to transmit the detected temperature information to the control module.

[0070] In this embodiment, the sixth detection module, the ninth detection module, and the tenth detection module are the same detection module.

[0071] When the control module receives the temperature information of the first detection module and the temperature information is lower than a preset first temperature threshold (a normal working temperature threshold of the battery cell), the control module controls the liquid cooling unit 1 to start, and the liquid cooling unit 1 supplies heat to the battery cells in the plurality of battery packs 7 through the first circuit.

[0072] When the liquid cooling unit 1 starts to supply heat to the battery cell, the control module receives the temperature information of the third detection module below the preset second temperature threshold (phase change temperature threshold of the phase change cold storage material), and the control module controls the first heat exchanger 4 and the phase change cold storage device 3 to start. The first heat exchanger 4 and the phase change cold storage device 3 absorb and store the cold energy in the environment through the second loop.

[0073] When the control module receives the temperature information of the first detection module above the preset first temperature threshold (normal working temperature threshold of the battery cell), and the control module receives the temperature information of the fourth detection module below the preset third temperature threshold (temperature threshold when the cooling liquid is used for heat dissipation), the control module controls the phase change cold storage device 3 to start, and the phase change cold storage device 3 dissipates heat for the battery cells in the plurality of battery packs 7 through the third loop.

[0074] When the control module receives the temperature information of the second detection module above the preset fourth temperature threshold (phase change temperature threshold of the phase change heat storage material), the control module controls the phase change cold storage device 3 to close and the phase change heat storage device 2 to start. The phase change heat storage device 2 absorbs and stores the heat generated by the plurality of battery cells through the sixth loop, and dissipates heat for the plurality of battery cells;

[0075] When the phase change heat storage device 2 starts to dissipate heat for the battery cells, the control module receives the temperature information of the fifth detection module above the preset third temperature threshold (temperature threshold when the cooling liquid is used for heat dissipation), and receives the temperature information of the fourth detection module below the preset third temperature threshold (temperature threshold when the cooling liquid is used for heat dissipation). The control module controls the phase change cold storage device 3 to start, and the phase change heat storage device 2 and the phase change cold storage device 3 cooperate to dissipate heat for the battery cells through the sixth loop;

[0076] Or when the phase change heat storage device 2 starts to dissipate heat for the battery cells, the control module receives the temperature information of the sixth detection module above the preset third temperature threshold (temperature threshold when the cooling liquid is used for heat dissipation). The control module controls the liquid cooling unit 1 to start, and the phase change heat storage device 2 and the liquid cooling unit 1 cooperate to dissipate heat for the battery cells through the eighth loop.

[0077] When the liquid cooling unit 1 starts to dissipate heat for the battery cells, the control module receives the temperature information of the third detection module above the preset fifth temperature threshold (general temperature threshold of the environment), and receives the temperature information of the seventh detection module below the preset sixth temperature (temperature of the phase change heat storage material), and receives the temperature information of the second detection module above the preset fourth temperature threshold (phase change temperature threshold of the phase change heat storage material). The control module controls the phase change heat storage device 2 to start, and controls the fan in the condenser of the liquid cooling unit 1 to keep low speed gear, and the liquid cooling unit 1 and the phase change heat storage device 2 cooperate to dissipate heat for the battery cells through the eighth loop.

[0078] When the control module receives temperature information of the eighth detection module higher than a preset seventh temperature threshold (temperature threshold when the coolant is used for heating) and receives temperature information of the first detection module lower than a preset first temperature threshold (normal operating temperature threshold of the battery cell), the control module controls the phase change heat storage device 2 to start, and the phase change heat storage device 2 supplies heat to the plurality of battery cells through the seventh circuit;

[0079] When the phase change heat storage device 2 starts to supply heat to the plurality of battery cells, the control module receives temperature information of the ninth detection module lower than the preset seventh temperature threshold (temperature threshold when the coolant is used for heating), the control module controls the thermistor 5 to be connected to the power supply, and the phase change heat storage device 2 and the thermistor 5 cooperate to supply heat to the plurality of battery cells through the seventh circuit;

[0080] Or when the phase change heat storage device 2 starts to supply heat to the plurality of battery cells, the control module receives temperature information of the tenth detection module lower than the preset seventh temperature threshold (temperature threshold when the coolant is used for heating), the control module controls the liquid cooling unit 1 to start, and the phase change heat storage device 2 and the liquid cooling unit 1 cooperate to supply heat to the plurality of battery cells through the eighth circuit.

[0081] The cold and heat storage method of the energy storage battery cabinet, characterized in that: comprising the cold and heat storage system of the energy storage battery cabinet in the preceding, further comprising the following steps:

[0082] S1: When the control module receives temperature information of the first detection module lower than a preset first temperature threshold (normal operating temperature threshold of the battery cell), the control module controls the liquid cooling unit 1 to start, and the liquid cooling unit 1 supplies heat to the battery cells in the plurality of battery packs 7 through the first circuit;

[0083] S2: When the liquid cooling unit 1 continuously supplies heat to the battery cells, the control module receives temperature information of the third detection module lower than a preset second temperature threshold (phase change temperature threshold of the phase change cold storage material), the control module controls the phase change cold storage device 3 and the first heat exchanger 4 to start, and the phase change cold storage device 3 and the first heat exchanger 4 absorb and store cold energy in the environment through the second circuit;

[0084] S3: When the control module receives temperature information of the first detection module higher than the preset first temperature threshold, the control module controls the phase change cold storage device 3 to start, and the liquid cooling unit 1 is turned off, and the phase change cold storage device 3 supplies heat to the plurality of battery cells through the third circuit;

[0085] S4: When the phase change cold storage device 3 continuously supplies heat to the battery cells, the control module receives temperature information of the second detection module higher than a preset fourth temperature threshold (phase change temperature threshold of the phase change heat storage material), the control module controls the phase change cold storage device 3 to be turned off and the phase change heat storage device 2 to be started, and the phase change heat storage device 2 absorbs and stores heat generated by the plurality of battery cells and supplies heat to the battery cells through the seventh circuit;

[0086] S5: When the phase change heat storage device 2 continuously absorbs and stores the heat generated by the plurality of battery cells and dissipates the heat for the battery cells, the control module receives temperature information of the fifth detection module higher than the preset third temperature threshold (temperature threshold when the cooling liquid is used for heat dissipation) and receives temperature information of the fourth detection module lower than the preset third temperature threshold (temperature threshold when the cooling liquid is used for heat dissipation), the control module controls the phase change cold storage device 3 to start, and the phase change heat storage device 2 and the phase change cold storage device 3 cooperate to absorb and store the heat generated by the plurality of battery cells through the sixth loop and dissipate the heat for the battery cells;

[0087] Or when the phase change heat storage device 2 continuously absorbs and stores the heat generated by the plurality of battery cells and dissipates the heat for the battery cells, the control module receives temperature information of the sixth detection module higher than the preset third temperature threshold (temperature threshold when the cooling liquid is used for heat dissipation), and the control module controls the liquid cooling unit 1 to start, and the phase change heat storage device 2 and the liquid cooling unit 1 cooperate to absorb and store the heat generated by the plurality of battery cells through the eighth loop and dissipate the heat for the battery cells.

[0088] S6: When the control module receives temperature information of the first detection module lower than the preset first temperature threshold (normal working temperature threshold of the battery cell) and receives temperature information of the eighth detection module higher than the preset seventh temperature threshold (temperature threshold when the cooling liquid is used for heating), the control module controls the phase change heat storage device 2 to start, and the phase change heat storage device 2 supplies heat to the plurality of battery cells through the seventh loop.

[0089] S7: When the phase change heat storage device 2 continuously supplies heat to the plurality of battery cells, the control module receives temperature information of the ninth detection module lower than the preset seventh temperature threshold (temperature threshold when the cooling liquid is used for heating), and the control module controls the thermistor 5 to be connected to the power supply, and the thermistor 5 and the phase change heat storage device 2 cooperate to supply heat to the plurality of battery cells through the seventh loop.

[0090] Or when the phase change heat storage device 2 continuously supplies heat to the plurality of battery cells, the control module receives temperature information of the tenth detection module lower than the preset seventh temperature threshold (temperature threshold when the cooling liquid is used for heating), and the control module controls the liquid cooling unit 1 to start, and the phase change heat storage device 2 and the liquid cooling unit 1 cooperate to supply heat to the plurality of battery cells through the eighth loop.

[0091] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A cold and heat storage system for an energy storage battery cabinet, comprising a circulating pipeline for cooling liquid flow, and a liquid cooling unit for supplying heat or dissipating heat to the battery cells in a plurality of battery packs, wherein the liquid cooling unit can independently dissipate heat or supply heat to the battery cells in the plurality of battery packs through the circulating pipeline. The application also comprises a phase change heat storage device for absorbing and storing heat generated by the battery cells, a phase change cold storage device for absorbing and storing cold energy in the environment, a first heat exchanger for absorbing and storing cold energy in the environment, a plurality of battery packs in the energy storage battery cabinet, and a control module for respectively controlling the opening and closing of the liquid cooling unit, the phase change heat storage device, the phase change cold storage device, and the fan speed stage of the condenser, The circulating pipeline is provided with a first liquid inlet main pipeline for providing cooling liquid for the plurality of battery packs in the energy storage battery cabinet, a first liquid outlet main pipeline for receiving the cooling liquid flowing out of the plurality of battery packs in the energy storage battery cabinet, a first branch pipeline connected in parallel with the phase change heat storage device, a second branch pipeline connected in parallel with the phase change cold storage device, and a third branch pipeline connected in parallel with the liquid cooling unit. The first valve for controlling the flow of cooling liquid through the phase change heat storage device, the second valve located on the first branch pipeline, the third valve for controlling the flow of cooling liquid through the phase change cold storage device, the fourth valve located on the second branch pipeline, the fifth valve located on the third branch pipeline, the seventh valve for controlling the flow of cooling liquid through the liquid cooling unit, and the eighth valve for controlling the flow of cooling liquid out of the first heat exchanger and the phase change cold storage device are also provided. The plurality of battery packs are respectively connected with the first liquid inlet main pipeline and the first liquid outlet main pipeline. The first branch pipeline and the phase change heat storage device are connected in parallel at one end and are jointly connected with the first liquid outlet main pipeline. The other end is connected with the first intermediate pipeline after being connected in parallel. The second branch pipeline and the phase change cold storage device are connected in parallel at one end and are jointly connected with the first intermediate pipeline. The other end is connected with the second intermediate pipeline after being connected in parallel. The phase change cold storage device and the first heat exchanger are connected in parallel at one end and are jointly connected with the first branch pipeline. The other end is connected with the second branch pipeline after being connected in parallel. The third valve is located on the first branch pipeline. The eighth valve is located on the second branch pipeline. The first branch pipeline and the second branch pipeline are connected in parallel at one end and are jointly connected with the first intermediate pipeline. The other end is connected with the second intermediate pipeline after being connected in parallel. The third branch pipeline and the liquid cooling unit are connected in parallel at one end and are jointly connected with the second intermediate pipeline. The other end is connected with the first liquid inlet main pipeline after being connected in parallel. The second intermediate pipeline is provided with a water pump. The plurality of battery packs, the first liquid outlet main pipeline, the first valve, the phase change heat storage device, the first intermediate pipeline, the first branch pipeline, the third valve, the phase change cold storage device, the second branch pipeline, the eighth valve, the second intermediate pipeline, the water pump, the third branch pipeline, the fifth valve, and the first liquid inlet main pipeline are sequentially connected to form a sixth loop for absorbing and storing the heat generated by the battery cells in the plurality of battery packs and dissipating the heat for the battery cells. The plurality of battery packs, the first liquid outlet main pipeline, the first valve, the phase change heat storage device, the first intermediate pipeline, the second branch pipeline, the fourth valve, the second intermediate pipeline, the water pump, the liquid cooling unit, the seventh valve, and the first liquid inlet main pipeline are sequentially connected to form an eighth loop for absorbing and storing the heat generated by the battery cells in the plurality of battery packs and dissipating or supplying heat for the battery cells. The phase change heat storage device can independently dissipate heat for the battery cells in the plurality of battery packs through the circulating pipeline, absorb and store the heat generated by the battery cells in the plurality of battery packs, or supply heat to the battery cells in the plurality of battery packs. The phase change heat storage device, the phase change heat storage device, and the liquid cooling unit can cooperate to dissipate heat for the battery cells in the plurality of battery packs through the circulating pipeline, absorb and store the heat generated by the battery cells in the plurality of battery packs, or supply heat to the battery cells in the plurality of battery packs. There are also a first detection module for detecting the temperature of the battery cells in the battery pack, a second detection module for detecting the temperature of the cooling liquid between the first liquid outlet main pipeline and the phase change heat storage device, a third detection module for detecting the ambient temperature, a fourth detection module for detecting the temperature of the phase change heat storage material, a fifth detection module for detecting the temperature of the cooling liquid between the phase change heat storage device and the phase change heat storage device, and a seventh detection module for detecting the temperature of the phase change heat storage material. The first detection module, the second detection module, the third detection module, the fourth detection module, the fifth detection module, and the seventh detection module are used to transmit the detected temperature information to the control module. When the control module receives temperature information from the first detection module that is lower than a preset first temperature threshold, the control module controls the liquid cooling unit to start, and the liquid cooling unit supplies heat to the battery cells in the plurality of battery packs through the circulating pipeline. When the liquid cooling unit starts to supply heat to the battery cells, the control module receives temperature information from the third detection module that is lower than a preset second temperature threshold, and the control module controls the first heat exchanger and the phase change heat storage device to start, and the first heat exchanger and the phase change heat storage device absorb and store the cooling capacity in the environment through the circulating pipeline. When the control module receives temperature information from the first detection module that is higher than a preset first temperature threshold, and the control module receives temperature information from the fourth detection module that is lower than a preset third temperature threshold, the control module controls the phase change heat storage device to start, and the phase change heat storage device dissipates heat for the battery cells in the plurality of battery packs through the circulating pipeline. When the control module receives temperature information from the second detection module that is higher than a preset fourth temperature threshold, the control module controls the phase change heat storage device to stop and the phase change heat storage device to start, and the phase change heat storage device dissipates heat for the battery cells through the circulating pipeline and simultaneously absorbs and stores the heat generated by the battery cells. When the phase change heat storage device starts to dissipate heat for the battery cells, the control module receives temperature information from the fifth detection module that is higher than a preset third temperature threshold, and receives temperature information from the fourth detection module that is lower than a preset third temperature threshold, and the control module controls the phase change heat storage device to start, and the phase change heat storage device and the phase change heat storage device cooperate to dissipate heat for the battery cells through the sixth loop. When the liquid cooling unit is started to dissipate heat for the battery cell, the control module receives temperature information of the third detection module higher than a preset fifth temperature threshold, receives temperature information of the seventh detection module lower than a preset sixth temperature, and receives temperature information of the second detection module higher than a preset fourth temperature threshold, the control module controls the phase change heat storage device to start, and controls the fan in the condenser of the liquid cooling unit to keep low speed gear, and the liquid cooling unit and the phase change heat storage device cooperate to dissipate heat for the battery cell through the eighth loop.

2. The thermal storage battery cabinet system of claim 1, wherein: Further comprising a sixth detection module for detecting the temperature of the cooling liquid between the phase change heat storage device and the liquid cooling unit, the sixth detection module being configured to transmit the detected temperature information to the control module; When the phase change heat storage device is started to dissipate heat for the battery cell, the control module receives temperature information of the sixth detection module higher than a preset third temperature threshold, the control module controls the liquid cooling unit to start, and the phase change heat storage device and the liquid cooling unit cooperate to dissipate heat for the battery cell through the circulation pipeline.

3. The thermal storage battery cabinet system of claim 1, wherein: Further comprising an eighth detection module for detecting the temperature of the phase change heat storage material, the eighth detection module being configured to transmit the detected temperature information to the control module; When the control module receives temperature information of the eighth detection module higher than a preset seventh temperature threshold and receives temperature information of the first detection module lower than a preset first temperature threshold, the control module controls the phase change heat storage device to start, and the phase change heat storage device supplies heat for the plurality of battery cells through the circulation pipeline.

4. The thermal storage battery cabinet system of claim 3, wherein: Further comprising a thermistor connected in parallel with the liquid cooling unit and the third branch pipeline, a ninth detection module for detecting the temperature of the cooling liquid between the phase change heat storage device and the thermistor, the ninth detection module being configured to transmit the detected temperature information to the control module, and the control module being further configured to control the thermistor to be connected or disconnected with the power supply; When the phase change heat storage device is started to supply heat for the plurality of battery cells, the control module receives temperature information of the ninth detection module lower than a preset seventh temperature threshold, the control module controls the thermistor to be connected with the power supply, and the phase change heat storage device and the thermistor cooperate to supply heat for the plurality of battery cells through the circulation pipeline.

5. The thermal storage battery cabinet system of claim 3, wherein: Further comprising a tenth detection module for detecting the temperature of the cooling liquid between the phase change heat storage device and the liquid cooling unit, the tenth detection module being configured to transmit the detected temperature information to the control module; When the phase change heat storage device is started to supply heat for the plurality of battery cells, the control module receives temperature information of the tenth detection module lower than a preset seventh temperature threshold, the control module controls the liquid cooling unit to start, and the phase change heat storage device and the liquid cooling unit cooperate to supply heat for the plurality of battery cells through the circulation pipeline.

6. A cold and hot storage method for an energy storage battery cabinet, characterized in that: The energy storage battery cabinet cold-heat storage system comprises the energy storage battery cabinet cold-heat storage system according to any one of claims 1-5, and further comprises the following steps: S1: when the control module receives temperature information of the first detection module lower than a preset first temperature threshold, the control module controls the liquid cooling unit to start, and the liquid cooling unit supplies heat for the battery cells in the plurality of battery packs through the circulation pipeline; S2: When the liquid cooling unit continues to supply heat to the battery cell, the control module receives temperature information of the third detection module below the preset second temperature threshold, the control module controls the phase change cold storage device and the first heat exchanger to start, and the phase change cold storage device and the first heat exchanger absorb and store the cold energy in the environment through the circulating pipeline; S3: When the control module receives temperature information of the first detection module above the preset first temperature threshold, the control module controls the phase change cold storage device to start, and the liquid cooling unit is turned off, and the phase change cold storage device cools the battery cell through the circulating pipeline; S4: When the phase change cold storage device continues to cool the battery cell, the control module receives temperature information of the second detection module above the preset fourth temperature threshold, the control module controls the phase change cold storage device to be turned off and the phase change heat storage device to be started, and the phase change heat storage device absorbs and stores the heat generated by the battery cell through the circulating pipeline and cools the battery cell; S5: When the phase change heat storage device continues to absorb and store the heat generated by the battery cell and cools the battery cell, the control module receives temperature information of the fifth detection module above the preset third temperature threshold and temperature information of the fourth detection module below the preset third temperature threshold, the control module controls the phase change cold storage device to start, and the phase change heat storage device and the phase change cold storage device cooperate to absorb and store the heat generated by the battery cell through the circulating pipeline and cool the battery cell; Or when the phase change heat storage device continues to absorb and store the heat generated by the battery cell and cools the battery cell, the control module receives temperature information of the sixth detection module above the preset third temperature threshold, and the control module controls the liquid cooling unit to start, and the phase change heat storage device and the liquid cooling unit cooperate to absorb and store the heat generated by the battery cell through the circulating pipeline and cool the battery cell; S6: When the control module receives temperature information of the first detection module below the preset first temperature threshold and temperature information of the eighth detection module above the preset seventh temperature threshold, the control module controls the phase change heat storage device to start, and the phase change heat storage device supplies heat to the battery cell through the circulating pipeline; S7: When the phase change heat storage device continues to supply heat to the battery cell, the control module receives temperature information of the ninth detection module below the preset seventh temperature threshold, the control module controls the thermistor to be connected to the power supply, and the thermistor and the phase change heat storage device cooperate to supply heat to the battery cell through the circulating pipeline; Or when the phase change heat storage device continues to supply heat to the battery cell, the control module receives temperature information of the tenth detection module below the preset seventh temperature threshold, the control module controls the liquid cooling unit to start, and the phase change heat storage device and the liquid cooling unit cooperate to supply heat to the battery cell through the circulating pipeline.

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