Cold and heat storage system and method for energy storage battery cabinet

Abstract

The invention relates to the technical field of electrochemical energy storage, and discloses an energy storage battery cabinet cold and heat storage system, which comprises a circulation pipeline, a liquid cooling unit, a phase change heat storage device and a phase change cold storage device, the phase change heat storage device can independently dissipate heat of the battery cells in the plurality of battery packs through the circulation pipeline, absorb and store 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, and can independently dissipate heat of the battery cells in the plurality of battery packs through the circulation pipeline. And the phase change heat storage device, the phase change cold storage device and the liquid cooling unit can be matched to dissipate heat of the battery cells in the plurality of battery packs through the circulating pipeline, absorb and store heat generated by the battery cells, or supply heat to the battery cells in the plurality of battery packs. The heat generated by the energy storage battery cabinet during working and the cooling capacity in the environment where the energy storage battery cabinet is located can be fully utilized, use of a liquid cooling unit is reduced, power is saved, and the use cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical energy storage, and in particular to a hot and cold storage system and method for an energy storage battery cabinet. Background Art

[0002] The energy storage battery cabinet is used to store electrical energy and release it to supply power when needed. When the energy storage battery cabinet is charging and discharging, the battery cells in the multiple battery packs in the energy storage battery cabinet will generate a lot of heat. In order for the battery cells to work normally, the battery cells need to be cooled. When the ambient temperature is low, the temperature of the battery cells themselves drops. In order for the battery cells to work normally, the battery cells need to be heated.

[0003] In the north or northwest region, the temperature difference between day and night is large, and the temperature difference between daytime and nighttime temperatures 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 battery cells themselves is high, so a liquid cooling unit is needed to dissipate heat for the battery cells. At night, the ambient temperature is low and the temperature of the battery cells themselves is low, so a liquid cooling unit is needed to heat the battery cells. The large amount of heat generated by the battery cells when working during the day is exactly what the battery cells need to heat when working at night, and the cold in the night environment is exactly what the battery cells need to dissipate heat when working during the day. In order to make full use of the heat generated by the energy storage battery cabinet when it is working and the cold in the environment, reduce the use of liquid cooling units, and save electricity, there is an urgent need for a heat and cold storage system for an energy storage battery cabinet that can absorb the heat generated by the storage battery cells for heating the battery cells and absorb the cold in the storage environment for heat dissipation of the battery cells. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, one of the objects of the present invention is to provide a hot and cold storage system for an energy storage battery cabinet, which can fully utilize the heat generated by the energy storage battery cabinet when it is working and the coldness in the environment where the energy storage battery cabinet is located, reduce the use of liquid cooling units, save electricity, and save use costs.

[0005] The technical solution adopted by the present invention is as follows: a heat and cold storage system for an energy storage battery cabinet, comprising a circulation pipeline for the circulation of coolant, and a liquid cooling unit for supplying heat or dissipating heat to multiple battery cells in a battery pack, wherein the liquid cooling unit can dissipate heat or supply heat to multiple battery cells in a battery pack through the circulation pipeline alone, and also comprises a phase change heat storage device for absorbing and storing heat generated by the battery cells, and a phase change cold storage device for absorbing and storing cold in the environment, wherein the phase change heat storage device can dissipate heat to multiple battery cells in a battery pack through the circulation pipeline alone, and absorb and store heat generated by multiple battery cells in a battery pack, or supply heat to multiple battery cells in a battery pack, wherein the phase change heat storage device can dissipate heat to multiple battery cells in a battery pack through the circulation pipeline alone, and absorb and store heat generated by multiple battery cells in a battery pack, or supply heat to multiple battery cells in a battery pack, wherein the phase change heat storage device, the phase change cold storage device, and the liquid cooling unit can cooperate to dissipate heat to multiple battery cells in a battery pack through the circulation pipeline, and absorb and store heat generated by multiple battery cells in a battery pack, or supply heat to multiple battery cells in a battery pack.

[0006] Compared with the prior art, the present invention has the following beneficial effects: 1) The phase-change heat storage device of the present invention can absorb and store the heat generated by multiple battery cells to dissipate heat for the battery cells, or can provide heat for the battery cells after storing the heat. The phase-change cold storage device can absorb the cold generated in the storage environment to dissipate heat for the battery cells. The liquid cooling unit can dissipate heat or provide heat for the battery cells. In the circulation 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 during operation and the cold in the environment of the energy storage battery cabinet can be fully utilized. There can be a variety of mobile ways to dissipate heat or provide heat for the battery cells, such as the phase-change heat storage device, the phase-change cold storage device, and the liquid cooling unit operating separately, such as 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 operating in coordination. That is, there can be a variety of options for dissipating heat or providing heat for the battery cells, which can reduce the use of liquid cooling units. In the north or northwest, the temperature difference between day and night is large. During the day, The temperature difference between daytime and nighttime temperatures can reach more than 10 degrees Celsius, and there are 3 to 12 months in a year with a large temperature difference between day and night. 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 several degrees and the nighttime temperature is more than 10 degrees below zero. An energy storage battery cabinet is charged and discharged twice a day. If the power required for the heat supply / dissipation of the energy storage battery cabinet per hour by a liquid cooling unit is calculated as 2 degrees of electricity, 48 degrees of electricity are required per day. The number of days with a large temperature difference between day and night in a year is 90 to 365 days. The energy storage battery cabinet can absorb the heating heat required for the energy storage battery cabinet for one day by charging / discharging once. Excluding the 8 degrees of electricity required for four hours of heat dissipation or heating of the battery core by the liquid cooling unit for two charges, 40 degrees of electricity can be saved per day by using a variety of mobile methods to dissipate heat or heat the battery core. The present invention can save 3,600 to 14,600 degrees of electricity on days with a large temperature difference between day and night in a year, which can save electricity and save use costs. 2) Multiple mobile methods are used to dissipate heat or heat the battery cells, avoiding a single heating or heat dissipation method, ensuring effective heat dissipation or heat supply for the energy storage battery cabinet and improving charging or power supply efficiency. Moreover, when the ambient temperature is high and the temperature of the battery cells themselves is high, the original liquid cooling unit needs to maintain a high speed of the fan in the condenser to efficiently dissipate heat for the battery cells and improve the heat exchange efficiency, resulting in high noise. Through the cooperation of the phase change heat storage device and the liquid cooling unit, the liquid cooling unit does not need to maintain a high speed of the fan in the condenser to improve the heat exchange efficiency, but only needs a low speed, which can reduce the energy consumption of the liquid cooling unit and reduce the noise generated by the liquid cooling unit.

[0007] As a preferred embodiment of the present invention, it also includes a first heat exchanger for absorbing and storing environmental cold, and a control module for respectively controlling the liquid cooling unit, the phase change heat storage device, and the start and stop of the phase change cold storage device, and 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 coolant between the first liquid outlet main pipeline and the phase change heat storage device, a third detection module for detecting the ambient temperature, and a fourth detection module for detecting the temperature of the phase change cold storage material. 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; 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 provides heat to the battery cells in the multiple battery packs through a circulation pipeline; When the liquid cooling unit starts to heat the battery cell, 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 cold in the storage environment through the circulation pipeline; When the temperature information received by the control module from the first detection module is higher than a preset first temperature threshold, and the temperature information received by the control module from the fourth detection module 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 multiple battery packs through the circulation pipeline; When the temperature information received by the control module from the second detection module is higher than a preset fourth temperature threshold, the control module controls the phase change cold storage device to turn off and the phase change heat storage device to start. The phase change heat storage device dissipates heat for multiple battery cells through a circulation pipeline and simultaneously absorbs and stores heat generated by multiple battery cells.

[0008] In this solution, the first temperature threshold is the normal operating temperature threshold of the battery cell, the second temperature threshold is the phase change temperature threshold of the phase change cold storage material, the third temperature threshold is the temperature threshold when the coolant is used for heat dissipation, and the fourth temperature threshold is the phase change temperature threshold of the phase change heat storage material; when the control module receives the temperature information from the first detection module that is lower than the preset normal operating 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 circulation pipeline. While the liquid cooling unit supplies heat to the battery cell, when the control module receives the temperature information from the third detection module that is 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 The heat exchanger and the phase change cold storage device are started, and the first heat exchanger and the phase change cold storage device absorb the cold in the storage environment through the circulation pipeline. When the control module receives the temperature information from the first detection module that is higher than the preset normal operating temperature threshold of the battery cell, the control module controls the phase change cold storage device to start. At this time, the liquid cooling unit is not started, and the phase change cold storage device dissipates heat for the battery cell through the circulation pipeline. When the phase change cold storage device dissipates heat for the battery cell, the control module receives the temperature information from the second detection module that is 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 close and the phase change heat storage device to start. The phase change heat storage device absorbs the heat generated by the storage battery cell through the circulation pipeline and dissipates the heat for the battery cell.

[0009] Beneficial effects: The liquid cooling unit, phase change cold storage device, and phase change heat storage device can reduce the use of the liquid cooling unit through flexible coordination, make full use of the heat generated by the multiple cells in the energy storage battery cabinet and the coldness in the environment where the energy storage battery cabinet is located, effectively reduce heat emissions, and be environmentally friendly.

[0010] As a preferred embodiment of the present invention, it also includes a fifth detection module for detecting the temperature of the coolant between the phase-change thermal storage device and the phase-change cold storage device, and the fifth detection module is used 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 from the fifth detection module that is higher than the preset third temperature threshold, and receives temperature information from the fourth detection module that is lower than the preset third temperature threshold, and 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 dissipate heat for the battery cell through a circulation pipeline.

[0011] In this solution, the third temperature threshold is the temperature threshold when the coolant is used for heat dissipation. When the phase change heat storage device is started to dissipate heat for the battery cell, the temperature information received by the control module from the fifth detection module is higher than the preset temperature threshold when the coolant is used for heat dissipation, and the temperature information received from the fourth detection module is lower than the preset temperature threshold when the coolant is used for heat dissipation. That is to say, the temperature of the phase change cold storage material is lower than the temperature threshold when the coolant is used for heat dissipation. The phase change cold storage device is started to dissipate heat for the coolant again, so that the coolant reaches the required temperature for dissipating heat for the battery cell.

[0012] As a preferred embodiment of the present invention, it also includes a sixth detection module for detecting the temperature of the coolant between the phase change heat storage device and the liquid cooling unit, and the sixth detection module is used 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 from the sixth detection module that is higher than the preset third temperature threshold, and the control module controls the liquid cooling unit to start. The phase change heat storage device and the liquid cooling unit cooperate to dissipate heat for the battery cell through a circulation pipeline.

[0013] In this solution, the third temperature threshold is the temperature threshold when the coolant is used for heat dissipation. When the phase change heat storage device is started to dissipate heat for the battery cell, the control module receives the temperature information from the sixth detection module that is higher than the preset temperature threshold when the coolant is used for heat dissipation. The liquid cooling unit is started to dissipate heat for the coolant again, so that the coolant reaches the required temperature for dissipating heat for the battery cell.

[0014] As a preferred embodiment of the present invention, it also includes a seventh detection module for detecting the temperature of the phase change thermal storage material, the seventh detection module is used to transmit the detected temperature information to the control module, and the control module is also used to control the wind speed gear of the fan in the condenser; When the liquid cooling unit is started to dissipate heat for the battery cells, the control module receives temperature information from the third detection module that is higher than the preset fifth temperature threshold, and receives temperature information from the seventh detection module that is lower than the preset sixth temperature, and receives temperature information from the second detection module that is 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 maintain a low speed gear, and the liquid cooling unit and the phase change heat storage device cooperate to dissipate heat for the battery cells through a circulation pipeline.

[0015] In this solution, the fifth temperature threshold is the general temperature threshold of the environment, the sixth temperature is the temperature of the phase change heat storage material, and the fourth temperature threshold is the phase change temperature threshold of the phase change heat storage material. The temperature information received by the control module from the third detection module is higher than the preset general temperature threshold of the environment, and the temperature information received from the seventh detection module is lower than the preset temperature of the phase change heat storage material, and the temperature information received from the second detection module is higher than the preset phase change temperature threshold of the phase change heat storage material. That is, the ambient temperature is high, the heat storage amount in the phase change heat storage device is low or can continue to store heat, and the temperature of the coolant flowing out of the battery pack for heat dissipation of the battery cell is higher than the preset phase change temperature threshold of the phase change heat storage material. The liquid cooling unit has already been started to dissipate heat for the battery cell. At this time, adding the phase change heat storage device can prevent the liquid cooling unit from running the fan in the condenser at a high speed in order to improve the heat dissipation efficiency, resulting in loud noise.

[0016] As a preferred embodiment of the present invention, it also includes an eighth detection module for detecting the temperature of the phase-change thermal storage material, and the eighth detection module is used to transmit the detected temperature information to the control module; When the temperature information received by the control module from the eighth detection module is higher than the preset seventh temperature threshold, and the temperature information received from the first detection module is 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 provides heat to multiple battery cells through a circulation pipeline.

[0017] In this solution, the seventh temperature threshold is the temperature threshold when the coolant is used for heating, and the first temperature threshold is the normal operating temperature threshold of the battery cell, that is, heat is stored in the phase change heat storage device, and the phase change heat storage device is started to provide heat for multiple battery cells.

[0018] Beneficial effect: When providing heat, in addition to the liquid cooling unit being used to heat the battery cells, the phase change heat storage device can also be used to heat the battery cells, reducing the use of the liquid cooling unit.

[0019] As a preferred embodiment of the present invention, it also includes a thermistor and a ninth detection module for detecting the temperature of the coolant between the phase-change heat storage device and the thermistor, wherein the ninth detection module is used to transmit the detected temperature information to the control module, and the control module is also used to control the thermistor to be connected or disconnected with the power supply; When the phase change heat storage device is started to provide heat for multiple battery cells, the control module receives temperature information from the ninth detection module that is lower than the preset seventh temperature threshold, and the control module controls the thermistor to be connected to the power supply, and the phase change heat storage device and the thermistor cooperate to provide heat for multiple battery cells through a circulation pipeline.

[0020] In this scheme, the seventh temperature threshold is the temperature threshold when the coolant is used for heating, that is, after the phase change heat storage device is started to heat multiple battery cells for a period of time, the heat stored in the phase change heat storage device decreases. At this time, the thermistor heats the coolant passing through the phase change heat storage device again, so that the coolant temperature reaches the temperature required for heating the battery cells.

[0021] Beneficial effect: The thermistor can assist the phase change heat storage device in supplying heat to the coolant, ensuring that the coolant can effectively heat the battery cell.

[0022] As a preferred embodiment of the present invention, it also includes a tenth detection module for detecting the temperature of the coolant between the phase change heat storage device and the liquid cooling unit, and the tenth detection module is used to transmit the detected temperature information to the control module; When the phase change heat storage device is started to provide heat for multiple battery cells, the control module receives temperature information from the tenth detection module that is lower than the preset seventh temperature threshold, and the control module controls the liquid cooling unit to start. The phase change heat storage device and the liquid cooling unit cooperate to provide heat for multiple battery cells through a circulation pipeline.

[0023] In this scheme, the seventh temperature threshold is the temperature threshold when the coolant is used for heating, that is, after the phase change heat storage device is started to heat multiple battery cells for a period of time, the heat stored in the phase change heat storage device decreases. At this time, the liquid cooling unit is started to heat the coolant that has passed through the phase change heat storage device again, so that the coolant temperature reaches the temperature required for heating the battery cells.

[0024] Beneficial effect: The liquid cooling unit can assist the phase change heat storage device to heat the coolant, ensuring that the coolant can effectively heat the battery cells.

[0025] As a preferred embodiment of the present invention, it also includes a plurality of battery packs located in an energy storage battery cabinet, the circulation pipeline is provided with a first liquid inlet main pipeline for providing cooling liquid to the plurality of battery packs in the energy storage battery cabinet, a first liquid outlet main pipeline for receiving 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, and a first valve for controlling the coolant to flow through the phase change heat storage device, a second valve located on the first branch pipeline, a third valve for controlling the coolant to flow through the phase change cold 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 coolant to flow through the liquid cooling unit; The multiple battery packs are respectively connected to the first liquid inlet main pipeline and the first liquid outlet main pipeline. The first branch pipeline is connected in parallel with one end of the phase change heat storage device and then converged to be connected to the first liquid outlet main pipeline, and the other end is connected in parallel and then converged to be connected to the first intermediate pipeline. The second branch pipeline is connected in parallel with one end of the phase change cold storage device and then converged to be connected to the first intermediate pipeline, and the other end is connected in parallel and then converged to be connected to the second intermediate pipeline. The third branch pipeline and one end of the liquid cooling unit are connected in parallel and then converged to be connected to the second intermediate pipeline, and the other end is connected in parallel and then converged to be connected to the first liquid inlet main pipeline. A water pump is provided on the second intermediate pipeline.

[0026] A second object of the present invention is to provide a method for storing heat and cold in an energy storage battery cabinet, comprising the above-mentioned heat and cold storage system for the energy storage battery cabinet, and further comprising the following steps: S1: When the temperature information received by the control module from the first detection module is lower than a preset first temperature threshold, the control module controls the liquid cooling unit to start, and the liquid cooling unit provides heat to the battery cells in the multiple battery packs through the circulation pipeline; S2: When the liquid cooling unit continues to heat the battery cell, 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 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 cold in the storage environment through the circulation pipeline; S3: When the temperature information received by the control module from the first detection module is higher than a preset first temperature threshold, the control module controls the phase change cold storage device to start, the liquid cooling unit to shut down, and the phase change cold storage device to dissipate heat for multiple battery cells through a circulation pipeline; S4: When the phase-change cold storage device continues to dissipate heat for the battery cells, the control module receives temperature information from the second detection module that is higher than a preset fourth temperature threshold, and the control module controls the phase-change cold storage device to be turned off and the phase-change heat storage device to be turned on. The phase-change heat storage device absorbs and stores heat generated by multiple battery cells through a circulation pipeline and dissipates heat for the battery cells; S5: When the phase-change heat storage device continuously absorbs and stores the heat generated by the multiple battery cells and dissipates the heat for the battery cells, the control module receives the temperature information from the fifth detection module that is higher than the preset third temperature threshold, and receives the temperature information from the fourth detection module that is lower than 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 multiple battery cells through the circulation pipeline and dissipate the heat for the battery cells; Or when the phase-change heat storage device continuously absorbs and stores the heat generated by the multiple battery cells and dissipates the heat for the battery cells, the control module receives the temperature information of the sixth detection module which is higher than 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 multiple battery cells through the circulation pipeline and dissipate the heat for the battery cells; S6: When the temperature information received by the control module from the first detection module is lower than the preset first temperature threshold, and the temperature information received from the eighth detection module is 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 provides heat for multiple battery cells through the circulation pipeline; S7: When the phase-change heat storage device continues to provide heat to the multiple battery cells, the control module receives temperature information from the ninth detection module that is higher than the preset seventh temperature threshold, and 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 provide heat to the multiple battery cells through the circulation pipeline; Or when the phase change heat storage device continues to supply heat to multiple battery cells, the control module receives temperature information from the tenth detection module that is higher than the preset seventh 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 supply heat to multiple battery cells through the circulation pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a control flow chart of the hot and cold storage system of the energy storage battery cabinet of the present invention; Figure 2 It is a schematic diagram of the coolant flow route in the hot and cold storage system of the energy storage battery cabinet of the present invention. DETAILED DESCRIPTION

[0028] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0030] The accompanying drawings 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.

[0031] Energy storage battery cabinet hot and cold storage system, such as Figure 2As shown, it includes a circulation pipeline for circulating coolant, a liquid cooling unit 1 for supplying heat or dissipating heat to the battery cells in a plurality of battery packs 7, a phase change heat storage device 2 for absorbing and storing heat generated by the battery cells, a phase change cold storage device 3 for absorbing cold in the storage environment, a first heat exchanger 4 for absorbing cold in the storage environment, a thermistor 5 connected in parallel with the liquid cooling unit 1, and a plurality of battery packs 7 located in the energy storage battery cabinet. The circulation pipeline is provided with a first liquid inlet main pipeline 6 for providing coolant to the plurality of battery packs 7 in the energy storage battery cabinet, a first liquid outlet main pipeline 8 for receiving coolant flowing out of the plurality of battery packs 7 in the energy storage battery cabinet, and a first branch pipeline 9 connected in parallel with the phase change heat storage device 2. , a second branch pipeline 10 connected in parallel with the phase change cold storage device 3, and a third branch pipeline 11 connected in parallel with the thermistor 5 and the liquid cooling unit 1, and a first valve 12 for controlling the coolant to flow through the phase change heat storage device 2, a second valve 13 located on the first branch pipeline 9, a third valve 14 for controlling the coolant to flow through the phase change cold storage device 3, a fourth valve 15 located on the second branch pipeline 10, a fifth valve 16 located on the third branch pipeline 11, a sixth valve 17 for controlling the coolant to flow through the thermistor 5, a seventh valve 18 for controlling the coolant to flow through the liquid cooling unit 1, and an eighth valve 19 for controlling the coolant to flow out of the first heat exchanger 4 and the phase change cold storage device.

[0032] Multiple battery packs 7 are respectively connected to the first liquid inlet main pipeline 6 and the first liquid outlet main pipeline 8, one end of the first branch pipeline and the phase change heat storage device 2 parallel line is connected to the first liquid outlet main pipeline 8, and the other end is connected in parallel and converges to connect with the first intermediate pipeline, the phase change cold storage device 3 and the first heat exchanger 4 are connected in parallel at one end and converge to connect with the first branch pipeline, and the other end is connected in parallel and converges to connect with the second branch pipeline, the third valve 14 is located on the first branch pipeline, and the eighth valve 19 is located on the second branch pipeline, the first branch pipeline and one end of the phase change cold storage device 3 are connected in parallel and then connected to the first intermediate pipeline, and the other end is connected in parallel and then converges to connect with the second intermediate pipeline, the third branch pipeline 11, the thermistor 5, and one end of the liquid cooling unit 1 are connected in parallel and then converge to connect with the second intermediate pipeline, and the other end is connected in parallel and converges to connect with the first liquid inlet main pipeline 6, and a water pump 20 is provided on the second intermediate pipeline.

[0033] In this embodiment, a plurality of battery packs 7, a first liquid outlet main pipeline 8, a first branch pipeline 9, a second valve 13, a first intermediate pipeline, a second branch pipeline 10, a fourth valve 15, a second intermediate pipeline, a water pump 20, a liquid cooling unit 1, a seventh valve 18, and a first liquid inlet main pipeline 6 are sequentially connected to form a first circuit for supplying heat or dissipating heat to the battery cells in the plurality of battery packs 7; The phase change cold storage device 3 and the first heat exchanger 4 are connected to form a second circuit for absorbing cold in the storage environment; A third circuit for cooling the 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; A fourth circuit for cooling the 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; A fifth circuit is formed by sequentially connecting a plurality of battery packs 7, a first liquid outlet main pipeline 8, a first valve 12, a phase change heat storage device 2, a first intermediate pipeline, a second branch pipeline 10, a fourth valve 15, a second intermediate pipeline, a water pump 20, a third branch pipeline 11, a fifth valve 16, and a first liquid inlet main pipeline 6 to absorb and store heat generated by the battery cells in the plurality of battery packs 7, and to dissipate heat for the battery cells or to provide heat for the battery cells; A sixth circuit for absorbing and storing heat generated by the battery cells in the plurality of battery packs 7 and dissipating heat for 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; A seventh circuit for supplying heat to the battery cells is formed by sequentially connecting a plurality of battery packs 7, a first liquid outlet main pipeline 8, a first valve 12, a phase change heat storage device 2, a first intermediate pipeline, a second branch pipeline 10, a fourth valve 15, a second intermediate pipeline, a water pump 20, a thermistor 5, a sixth valve 17, and a first liquid inlet main pipeline 6; A plurality of battery packs 7, a first liquid outlet main pipeline 8, a first valve 12, a phase change heat storage device 2, a first intermediate pipeline, a second branch pipeline 10, a fourth valve 15, a second intermediate pipeline, a water pump 20, a liquid cooling unit 1, a seventh valve 18, and a first liquid inlet main pipeline 6 are sequentially connected to form an eighth circuit for absorbing and storing heat generated by battery cells in the plurality of battery packs 7, and dissipating heat for the battery cells or providing heat for the battery cells.

[0034] In this embodiment, what circulates in the circulation pipeline is coolant, and the coolant is a mixture of water and ethylene glycol. Because it is coolant, the phase change heat storage device 2 and the phase change cold storage device 3 can be directly connected to the circulation pipeline without the need for heat exchange by a heat exchanger, which can improve the heat exchange efficiency between the coolant and the phase change heat storage device 2, and between the coolant and the phase change cold storage device 3.

[0035] 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, condenser, expansion valve, and second heat exchanger are connected in sequence to form a loop for the circulation of refrigerant. The coolant flowing in the circulation pipeline passes through the liquid cooling plate to dissipate heat or heat the battery cell, and exchanges heat with the refrigerant through the second heat exchanger. In this embodiment, the refrigerant can be R410A.

[0036] like Figure 1 As shown, it also includes a control module for respectively controlling the opening and closing of the liquid cooling unit 1, the phase change heat storage device 2, and the phase change heat storage device 3, as well as a first detection module for detecting the temperature of the battery cells in the battery pack 7, a second detection module for detecting the temperature of the coolant between the first liquid outlet main pipeline 8 and the phase change heat storage device 2, 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 coolant between the phase change heat storage device 2 and the phase change heat storage device 3, a sixth detection module for detecting the temperature of the coolant between the phase change heat storage device 2 and the liquid cooling unit 1, a seventh detection module for detecting the temperature of the phase change heat storage material, an eighth detection module for detecting the temperature of the phase change heat storage material, a ninth detection module for detecting the temperature of the coolant between the phase change heat storage device 2 and the thermistor 5, and a tenth detection module for detecting the temperature of the coolant between the phase change heat storage device 2 and the liquid cooling unit 1.

[0037] In this embodiment, the control module is also used to control the wind speed gear of the fan in the condenser and to control the thermistor 5 to be connected or disconnected from the power supply.

[0038] 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 used to transmit the detected temperature information to the control module. In this embodiment, the sixth detection module, the ninth detection module and the tenth detection module are the same detection module.

[0039] When the control module receives temperature information from the first detection module that is 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 provides heat to the battery cells in the multiple battery packs 7 through the first circuit.

[0040] When the liquid cooling unit 1 starts to supply heat to the battery cell, the control module receives temperature information from the third detection module that is lower than 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, and the first heat exchanger 4 and the phase change cold storage device 3 absorb the cold in the storage environment through the second circuit.

[0041] When the temperature information received by the control module from the first detection module is higher than the preset first temperature threshold (the normal operating temperature threshold of the battery cell), and the temperature information received by the control module from the fourth detection module is lower than the preset third temperature threshold (the temperature threshold when the coolant 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 multiple battery packs 7 through the third circuit.

[0042] When the control module receives temperature information from the second detection module that is higher than the preset fourth temperature threshold (phase change temperature threshold of the phase change thermal storage material), the control module controls the phase change cold storage device 3 to be turned off and the phase change thermal storage device 2 to be turned on. The phase change thermal storage device 2 absorbs and stores the heat generated by the multiple battery cells through the fifth circuit and dissipates heat for the multiple battery cells. When the phase-change heat storage device 2 is started to dissipate heat for the battery cell, the control module receives temperature information from the fifth detection module that is higher than the preset third temperature threshold (temperature threshold when the coolant is used for heat dissipation), and receives temperature information from the fourth detection module that is lower than the preset third temperature threshold (temperature threshold when the coolant 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 cell through the sixth circuit; Or when the phase change heat storage device 2 is started to dissipate heat for the battery cell, the control module receives temperature information from the sixth detection module that is higher than a preset third temperature threshold (the temperature threshold when the coolant 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 dissipate heat for the battery cell through the eighth circuit.

[0043] When the liquid cooling unit 1 is started to dissipate heat for the battery cells, the control module receives temperature information from the third detection module that is higher than the preset fifth temperature threshold (the general ambient temperature threshold), and receives temperature information from the seventh detection module that is lower than the preset sixth temperature (the temperature of the phase change thermal storage material), and receives temperature information from the second detection module that is higher than the preset fourth temperature threshold (the phase change temperature threshold of the phase change thermal storage material). The control module controls the phase change thermal storage device 2 to start, and controls the fan in the condenser of the liquid cooling unit 1 to maintain a low speed gear. The liquid cooling unit 1 and the phase change thermal storage device 2 cooperate to dissipate heat for the battery cells through the eighth circuit.

[0044] When the control module receives temperature information from the eighth detection module that is higher than the preset seventh temperature threshold (temperature threshold when the coolant is used for heating), and receives temperature information from the first detection module that is lower than the 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 provides heat for multiple battery cells through the fifth circuit; When the phase-change heat storage device 2 is started to provide heat for multiple battery cells, the control module receives temperature information from the ninth detection module that is lower than the preset seventh temperature threshold (the temperature threshold when the coolant is used for heating), and 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 provide heat for multiple battery cells through the seventh circuit; Or when the phase change heat storage device 2 is started to provide heat for multiple battery cells, the control module receives the temperature information from the tenth detection module that is lower than the preset seventh temperature threshold (the temperature threshold when the coolant 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 provide heat for multiple battery cells through the eighth circuit.

[0045] The method for storing hot and cold energy in a battery cabinet is characterized in that it includes the hot and cold energy storage system of the battery cabinet described above, and further includes the following steps: S1: When the control module receives temperature information from the first detection module that is 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 provides heat to the battery cells in the multiple battery packs 7 through the first circuit; S2: When the liquid cooling unit 1 continues to heat the battery cell, the control module receives the temperature information from the third detection module that is lower than the preset second temperature threshold (phase change temperature threshold of the phase change cold storage material), and 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 the cold in the storage environment through the second circuit; S3: When the temperature information received by the control module from the first detection module is higher than the preset first temperature threshold, the control module controls the phase change cold storage device 3 to start, the liquid cooling unit 1 to shut down, and the phase change cold storage device 3 to dissipate heat for multiple battery cells through the third circuit; S4: When the phase-change cold storage device 3 continues to dissipate heat for the battery cells, the control module receives temperature information from the second detection module that is higher than the preset fourth temperature threshold (phase change temperature threshold of the phase change thermal storage material), and the control module controls the phase-change cold storage device 3 to be turned off and the phase-change thermal storage device 2 to be turned on. The phase-change thermal storage device 2 absorbs and stores heat generated by multiple battery cells through the fifth circuit and dissipates heat for the battery cells; S5: When the phase-change heat storage device 2 continuously absorbs and stores the heat generated by the multiple battery cells and dissipates the heat for the battery cells, the control module receives the temperature information of the fifth detection module higher than the preset third temperature threshold (the temperature threshold when the coolant is used for heat dissipation), and receives the temperature information of the fourth detection module lower than the preset third temperature threshold (the temperature threshold when the coolant 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 multiple battery cells through the sixth circuit and dissipate the heat for the battery cells; Or when the phase-change heat storage device 2 continuously absorbs and stores the heat generated by the multiple battery cells and dissipates the heat for the battery cells, the control module receives the temperature information of the sixth detection module which is higher than the preset third temperature threshold (the temperature threshold when the coolant 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 multiple battery cells through the eighth circuit and dissipate the heat for the battery cells; S6: When the temperature information received by the control module from the first detection module is lower than the preset first temperature threshold (the normal operating temperature threshold of the battery cell), and the temperature information received from the eighth detection module is higher than the preset seventh temperature threshold (the temperature threshold when the coolant 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 provides heat for multiple battery cells through the fifth circuit; S7: When the phase-change heat storage device 2 continues to provide heat to the multiple battery cells, the control module receives temperature information from the ninth detection module that is higher than the preset seventh temperature threshold (the temperature threshold when the coolant 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 provide heat to the multiple battery cells through the seventh circuit; Or when the phase change heat storage device 2 continues to supply heat to multiple battery cells, the control module receives temperature information from the tenth detection module that is higher than the preset seventh temperature threshold (the temperature threshold when the coolant 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 multiple battery cells through the eighth circuit.

[0046] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A heat and cold storage system for an energy storage battery cabinet, comprising a circulation pipeline for circulating a coolant, and a liquid cooling unit for supplying heat or dissipating heat to multiple battery cells in a battery pack, wherein the liquid cooling unit can dissipate heat or supply heat to multiple battery cells in a battery pack through the circulation pipeline alone, characterized in that: It also includes a phase change heat storage device for absorbing and storing heat generated by battery cells, and a phase change cold storage device for absorbing and storing cold in the environment. The phase change heat storage device can dissipate heat for battery cells in multiple battery packs through a circulation pipeline alone, and absorb and store heat generated by battery cells in multiple battery packs, or provide heat for battery cells in multiple battery packs. The phase change heat storage device can dissipate heat for battery cells in multiple battery packs through a circulation pipeline alone. The phase change heat storage device, phase change cold storage device, and liquid cooling unit can cooperate to dissipate heat for battery cells in multiple battery packs through a circulation pipeline, and absorb and store heat generated by battery cells in multiple battery packs, or provide heat for battery cells in multiple battery packs.

2. The energy storage battery cabinet cold and hot storage system according to claim 1, characterized in that: It also includes a first heat exchanger for absorbing and storing environmental cold, and a control module for respectively controlling the liquid cooling unit, the phase change heat storage device, and the start and stop of the phase change heat storage device, as well as a first detection module for detecting the temperature of the battery core in the battery pack, a second detection module for detecting the temperature of the coolant between the first liquid outlet main pipeline and the phase change heat storage device, a third detection module for detecting the ambient temperature, and a fourth 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, and the fourth 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 provides heat to the battery cells in the multiple battery packs through a circulation pipeline; When the liquid cooling unit starts to heat the battery cell, 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 cold in the storage environment through the circulation pipeline; When the temperature information received by the control module from the first detection module is higher than a preset first temperature threshold, and the temperature information received by the control module from the fourth detection module 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 multiple battery packs through the circulation pipeline; When the temperature information received by the control module from the second detection module is higher than a preset fourth temperature threshold, the control module controls the phase change cold storage device to turn off and the phase change heat storage device to start. The phase change heat storage device dissipates heat for multiple battery cells through a circulation pipeline and simultaneously absorbs and stores heat generated by multiple battery cells.

3. The energy storage battery cabinet cold and hot storage system according to claim 2 is characterized in that: Also includes a fifth detection module for detecting the temperature of the coolant between the phase-change thermal storage device and the phase-change cold storage device, wherein the fifth detection module is used 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 from the fifth detection module that is higher than the preset third temperature threshold, and receives temperature information from the fourth detection module that is lower than the preset third temperature threshold, and 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 dissipate heat for the battery cell through a circulation pipeline.

4. The energy storage battery cabinet cold and hot storage system according to claim 2, characterized in that: It also includes a sixth detection module for detecting the temperature of the coolant between the phase change heat storage device and the liquid cooling unit, and the sixth detection module is used 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 from the sixth detection module that is higher than the preset third temperature threshold, and the control module controls the liquid cooling unit to start. The phase change heat storage device and the liquid cooling unit cooperate to dissipate heat for the battery cell through a circulation pipeline.

5. The energy storage battery cabinet cold and hot storage system according to claim 2, characterized in that: It also includes a seventh detection module for detecting the temperature of the phase-change thermal storage material, the seventh detection module is used to transmit the detected temperature information to the control module, and the control module is also used to control the wind speed gear of the fan in the condenser; When the liquid cooling unit is started to dissipate heat for the battery cells, the control module receives temperature information from the third detection module that is higher than the preset fifth temperature threshold, and receives temperature information from the seventh detection module that is lower than the preset sixth temperature, and receives temperature information from the second detection module that is 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 maintain a low speed gear, and the liquid cooling unit and the phase change heat storage device cooperate to dissipate heat for the battery cells through a circulation pipeline.

6. The energy storage battery cabinet cold and hot storage system according to claim 2, characterized in that: It also includes an eighth detection module for detecting the temperature of the phase-change thermal storage material, and the eighth detection module is used to transmit the detected temperature information to the control module; When the temperature information received by the control module from the eighth detection module is higher than the preset seventh temperature threshold, and the temperature information received from the first detection module is 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 provides heat to multiple battery cells through a circulation pipeline.

7. The energy storage battery cabinet cold and hot storage system according to claim 6, characterized in that: It also includes a thermistor and a ninth detection module for detecting the temperature of the coolant between the phase-change heat storage device and the thermistor, wherein the ninth detection module is used to transmit the detected temperature information to the control module, and the control module is also used to control the thermistor to be connected or disconnected with the power supply; When the phase change heat storage device is started to provide heat for multiple battery cells, the control module receives temperature information from the ninth detection module that is lower than the preset seventh temperature threshold, and the control module controls the thermistor to be connected to the power supply, and the phase change heat storage device and the thermistor cooperate to provide heat for multiple battery cells through a circulation pipeline.

8. The energy storage battery cabinet cold and hot storage system according to claim 6, characterized in that: It also includes a tenth detection module for detecting the temperature of the coolant between the phase change heat storage device and the liquid cooling unit, and the tenth detection module is used to transmit the detected temperature information to the control module; When the phase change heat storage device is started to provide heat for multiple battery cells, the control module receives temperature information from the tenth detection module that is lower than the preset seventh temperature threshold, and the control module controls the liquid cooling unit to start. The phase change heat storage device and the liquid cooling unit cooperate to provide heat for multiple battery cells through a circulation pipeline.

9. The energy storage battery cabinet cold and hot storage system according to claim 1, characterized in that: It also includes a plurality of battery packs in the energy storage battery cabinet, the circulation pipeline is provided with a first liquid inlet main pipeline for providing cooling liquid to the plurality of battery packs in the energy storage battery cabinet, a first liquid outlet main pipeline for receiving cooling liquid flowing out of the plurality of battery packs in the energy storage battery cabinet, a first branch pipeline in parallel with the phase change heat storage device, a second branch pipeline in parallel with the phase change cold storage device, and a third branch pipeline in parallel with the liquid cooling unit, and a first valve for controlling the coolant to flow through the phase change heat storage device, a second valve on the first branch pipeline, a third valve for controlling the coolant to flow through the phase change cold storage device, a fourth valve on the second branch pipeline, a fifth valve on the third branch pipeline, and a seventh valve for controlling the coolant to flow through the liquid cooling unit; The multiple battery packs are respectively connected to the first liquid inlet main pipeline and the first liquid outlet main pipeline. The first branch pipeline is connected in parallel with one end of the phase change heat storage device and then converged to be connected to the first liquid outlet main pipeline, and the other end is connected in parallel and then converged to be connected to the first intermediate pipeline. The second branch pipeline is connected in parallel with one end of the phase change cold storage device and then converged to be connected to the first intermediate pipeline, and the other end is connected in parallel and then converged to be connected to the second intermediate pipeline. The third branch pipeline and one end of the liquid cooling unit are connected in parallel and then converged to be connected to the second intermediate pipeline, and the other end is connected in parallel and then converged to be connected to the first liquid inlet main pipeline. A water pump is provided on the second intermediate pipeline.

10. A method for storing hot and cold energy in a battery cabinet, characterized in that: The energy storage battery cabinet cold and hot storage system comprising any one of claims 1 to 9 further comprises the following steps: S1: When the temperature information received by the control module from the first detection module is lower than a preset first temperature threshold, the control module controls the liquid cooling unit to start, and the liquid cooling unit provides heat to the battery cells in the multiple battery packs through the circulation pipeline; S2: When the liquid cooling unit continues to heat the battery cell, 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 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 cold in the storage environment through the circulation pipeline; S3: When the temperature information received by the control module from the first detection module is higher than a preset first temperature threshold, the control module controls the phase change cold storage device to start, the liquid cooling unit to shut down, and the phase change cold storage device to dissipate heat for multiple battery cells through a circulation pipeline; S4: When the phase-change cold storage device continues to dissipate heat for the battery cells, the control module receives temperature information from the second detection module that is higher than a preset fourth temperature threshold, and the control module controls the phase-change cold storage device to be turned off and the phase-change heat storage device to be turned on. The phase-change heat storage device absorbs and stores heat generated by multiple battery cells through a circulation pipeline and dissipates heat for the battery cells; S5: When the phase-change heat storage device continuously absorbs and stores the heat generated by the multiple battery cells and dissipates the heat for the battery cells, the control module receives the temperature information from the fifth detection module that is higher than the preset third temperature threshold, and receives the temperature information from the fourth detection module that is lower than 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 multiple battery cells through the circulation pipeline and dissipate the heat for the battery cells; Or when the phase-change heat storage device continuously absorbs and stores the heat generated by the multiple battery cells and dissipates the heat for the battery cells, the control module receives the temperature information of the sixth detection module which is higher than 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 multiple battery cells through the circulation pipeline and dissipate the heat for the battery cells; S6: When the temperature information received by the control module from the first detection module is lower than the preset first temperature threshold, and the temperature information received from the eighth detection module is 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 provides heat for multiple battery cells through the circulation pipeline; S7: When the phase-change heat storage device continues to provide heat to the multiple battery cells, the control module receives temperature information from the ninth detection module that is higher than the preset seventh temperature threshold, and 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 provide heat to the multiple battery cells through the circulation pipeline; Or when the phase change heat storage device continues to supply heat to multiple battery cells, the control module receives temperature information from the tenth detection module that is higher than the preset seventh 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 supply heat to multiple battery cells through the circulation pipeline.

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