Energy storage cabinet

Abstract

The embodiment of the utility model provides an energy storage cabinet. Comprising an energy storage device, a power conversion device and a heat management device, the heat management device communicates with the energy storage device and the power conversion device, and the heat management device comprises a first loop unit, a second loop unit and a phase change heat storage unit; cooling liquid circulates in the first heat exchange pipeline and the second heat exchange pipeline, and the first heat exchange pipeline and the second heat exchange pipeline are mutually independent. The phase change heat storage unit is connected with one of the first heat exchange pipeline and the second heat exchange pipeline in series and connected with the other one of the first heat exchange pipeline and the second heat exchange pipeline in parallel. Through the arrangement of the thermal management device, the risks of overheating and thermal runaway of the battery can be reduced, battery performance reduction caused by too high temperature is reduced, the service life of the battery is prolonged, and the overall energy efficiency of the energy storage cabinet is improved. The heat management device absorbs and releases heat in the phase change process through the phase change heat storage unit, the temperature of the energy storage device and the temperature of the electric power conversion device are balanced, and therefore the heat management efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of thermal management technology, and in particular to an energy storage cabinet. Background Art

[0002] Energy storage cabinets generally include batteries and PCS (energy storage inverter); both need to work at a suitable temperature to ensure reliability, safety and performance. The capacity of the battery is closely related to the ambient temperature. If the temperature is high, it is easy to be damaged and overcharged. In severe cases, the battery will experience thermal runaway, which may cause the surrounding batteries to continue to run away, eventually causing a serious fire or even an explosion.

[0003] The related technology configures liquid cooling on the energy storage battery. The liquid cooling mainly adopts an air-cooled cold water system. Low-temperature water is produced by a compressor system. Ethylene glycol solution is used on the water side and transported to the battery cold plate by a pump to control the battery temperature.

[0004] However, the thermal management efficiency of the above-mentioned energy storage batteries is poor, resulting in a decrease in the benefits of the energy storage system. Utility Model Content

[0005] An embodiment of the present application provides an energy storage cabinet, which can perform more effective thermal management control on an energy storage device and a power conversion device of the energy storage cabinet by providing a thermal management device.

[0006] An embodiment of the present application provides an energy storage cabinet, including an energy storage device, a power conversion device, and a thermal management device, wherein the thermal management device includes a first circuit unit, a second circuit unit, and a phase change heat storage unit;

[0007] Cooling liquid flows through both the first circuit unit and the second circuit unit;

[0008] The first circuit unit comprises a first heat exchange pipe, and the coolant of the first circuit unit is used for heat exchange with the energy storage device of the energy storage cabinet;

[0009] The second circuit unit includes a second heat exchange pipeline, the coolant of the second circuit unit is used for heat exchange with the energy storage device of the energy storage cabinet, and the first circuit unit and the second circuit unit are independent of each other;

[0010] The phase-change heat storage unit is connected in series with one of the first heat exchange pipe and the second heat exchange pipe, and is connected in parallel with the other of the first heat exchange pipe and the second heat exchange pipe.

[0011] In some embodiments, the first circuit unit further includes a refrigeration unit and a heater, wherein the refrigeration unit is used to cool the coolant flowing through the first heat exchange pipe, and the heater is used to heat the coolant flowing through the first heat exchange pipe;

[0012] The phase-change heat storage unit is directly connected to the second heat exchange pipeline, and the phase-change heat storage unit is selectively connected to the first heat exchange pipeline.

[0013] In some embodiments, the thermal management device further includes a multi-way valve; the phase change thermal storage unit includes a first flow channel, a second flow channel and a phase change portion, the first flow channel and the second flow channel are spaced apart by the phase change portion,

[0014] The first flow channel is selectively connected to the first heat exchange pipeline through the multi-way valve, and the second flow channel is directly connected to the second heat exchange pipeline.

[0015] In some embodiments, the energy storage cabinet has a first working state and a second working state that are switchable with each other;

[0016] When the energy storage cabinet is in the first working state, the energy storage device, the power conversion device and the thermal management device are all working; the phase change heat storage unit is not in flow with the first heat exchange pipeline and is in communication with the second heat exchange pipeline;

[0017] When the energy storage cabinet is in the second working state, the energy storage device and the power conversion device are not working, the thermal management device is working, and the phase change heat storage unit and the first heat exchange pipeline selectively flow;

[0018] The energy storage cabinet further includes a controller, which is used to obtain a working state of the energy storage cabinet and control the communication between the phase change heat storage unit and the first heat exchange pipeline according to the working state.

[0019] In some embodiments, when the thermal management device further includes a multi-way valve, and the phase-change thermal storage unit includes a first flow channel, a second flow channel, and a phase-change portion, the phase-change portion has a threshold temperature;

[0020] The energy storage cabinet further includes a temperature sensor electrically connected to the controller, and the temperature sensor is used to obtain a detection temperature;

[0021] The controller has a preset temperature lower than the threshold temperature. The controller is configured to obtain the detection temperature provided by the temperature sensor, and control the connection relationship between the multi-way valve and the first flow channel according to the working state, the detection temperature and the preset temperature to balance the temperature of the first heat exchange pipe and the temperature of the second heat exchange pipe.

[0022] In some embodiments,

[0023] When the energy storage cabinet is in the first working state and the detected temperature is higher than the preset temperature or the detected temperature is lower than the preset temperature, the controller controls the multi-way valve so that the first heat exchange pipe is disconnected from the first flow channel and the second flow channel is connected to the second heat exchange pipe;

[0024] When the energy storage cabinet is in the second working state and the detected temperature is higher than the preset temperature, the controller controls the multi-way valve so that the first heat exchange pipe is disconnected from the first flow channel and the second flow channel is connected to the second heat exchange pipe;

[0025] When the energy storage cabinet is in the second working state and the detected temperature is lower than the preset temperature, the controller controls the multi-way valve to connect the first heat exchange pipe with the first flow channel and the second flow channel with the second heat exchange pipe.

[0026] In some embodiments, the multi-way valve is a three-way valve, and the three-way valve has a first valve port, a second valve port, and a third valve port that are interconnected, the first valve port is connected to the input end of the first heat exchange pipeline, the second valve port is connected to the output end of the first heat exchange pipeline, and the third valve port is connected to the input end of the first flow channel.

[0027] The first circuit unit further includes a first auxiliary pipeline connected to the first heat exchange pipeline, wherein one end of the first auxiliary pipeline is connected to the output end of the first flow channel, and the other end is connected to the output end of the first heat exchange pipeline.

[0028] In some embodiments, when the energy storage cabinet is in the first working state, or when the energy storage cabinet is in the second working state and the detected temperature is higher than the preset temperature,

[0029] The controller controls the three-way valve to close the third valve port and open the first valve port and the second valve port;

[0030] When the energy storage cabinet is in the second working state and the detected temperature is lower than the preset temperature,

[0031] The controller controls the three-way valve to close the first valve port, and to open the second valve port and the third valve port.

[0032] In some embodiments, the multi-way valve is a four-way valve, and the four-way valve has a fourth valve port, a fifth valve port, a sixth valve port and a seventh valve port that are connected to each other, the fourth valve port is connected to the input end of the first heat exchange pipeline, the fifth valve port is connected to the output end of the first heat exchange pipeline, and the sixth valve port is connected to the input end of the first flow channel;

[0033] The first circuit unit further includes a first air-to-liquid heat exchanger, a second auxiliary pipeline and a third auxiliary pipeline, wherein the first air-to-liquid heat exchanger is connected to the first heat exchange pipeline;

[0034] One end of the second auxiliary pipeline is connected to the output end of the first flow channel, and the other end is connected to the input end of the first heat exchange pipeline;

[0035] One end of the third auxiliary pipeline is communicated with the seventh valve port, and the other end is communicated with the input end of the first heat exchange pipeline.

[0036] In some embodiments, when the energy storage cabinet is in the first working state, or when the energy storage cabinet is in the second working state and the detected temperature is higher than the preset temperature,

[0037] The controller controls the four-way valve to close the fourth valve port and the sixth valve port and to open the fifth valve port and the seventh valve port; or, the controller controls the four-way valve to close the seventh valve port and the sixth valve port and to open the fifth valve port and the fourth valve port;

[0038] When the energy storage cabinet is in the second working state and the detected temperature is lower than the preset temperature,

[0039] The controller controls the four-way valve to close the fifth valve port and the seventh valve port and to open the fourth valve port and the sixth valve port; alternatively, the controller controls the four-way valve to close the fourth valve port and the seventh valve port and to open the fifth valve port and the sixth valve port.

[0040] The energy storage cabinet provided in the embodiment of the present application, by providing a first loop unit and a second loop unit, independently connects the energy storage device and the power conversion device, respectively, so that the temperature of the energy storage device and the power conversion device can be controlled in a targeted manner, thereby improving the flexibility and efficiency of thermal management; and the two loop units are convenient for maintenance and overhaul, and the cooling system of the energy storage device or the power conversion device can be maintained separately without affecting the other part.

[0041] By adding a phase change thermal storage unit, the characteristics of phase change materials that absorb and release large amounts of heat during the phase change process can be utilized to effectively balance the temperature of the energy storage device and the power conversion device and improve the efficiency of thermal management; in addition, the phase change thermal storage unit helps to avoid rapid changes in temperature and improve the reliability of the energy storage cabinet.

[0042] In this way, the batteries in the energy storage device can be guaranteed to work within a suitable temperature range, the aging rate of the batteries can be reduced, the service life of the batteries can be extended, and the risk of battery overheating and thermal runaway can be reduced, thereby improving the safety of the energy storage cabinet and avoiding safety accidents such as fire and explosion. In addition, the power conversion device can be guaranteed to work within a suitable temperature range to avoid the power conversion device working for too long and releasing too much heat to affect normal operation.

[0043] The design of the phase change heat storage unit being connected in series with one of the first heat exchange pipe and the second heat exchange pipe and in parallel with the other one allows the coolant to first exchange heat through the phase change heat storage unit during the flow process, and then flow into another circuit in parallel. This can more effectively utilize the heat exchange capacity of the phase change heat storage unit and improve the overall thermal management performance.

[0044] By using series and parallel connection between the two circuit units and the phase change thermal storage unit, the energy storage cabinet can allow the phase change thermal storage unit to exchange heat for different circuits separately under appropriate circumstances, thereby avoiding performance loss of the phase change thermal storage unit.

[0045] Through the aforementioned thermal management device, the energy storage cabinet can adapt to different detection temperatures, ensuring that the energy storage device and the power conversion device can work normally even at extreme temperatures. By maintaining effective thermal management, the degradation of battery performance caused by excessive temperature can be reduced, and the overall energy efficiency of the energy storage cabinet can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0047] Figure 1 A schematic diagram of the connection of the first structure of the energy storage cabinet provided in this application;

[0048] Figure 2 A second structural schematic diagram of the energy storage cabinet provided for this application;

[0049] Figure 3 A schematic diagram of the first structure of the phase change thermal storage unit of the energy storage cabinet provided in this application;

[0050] Figure 4 A schematic diagram of the first structure of the phase change thermal storage unit of the energy storage cabinet provided in this application;

[0051] Figure 5 A schematic diagram of the first structure of the phase change thermal storage unit of the energy storage cabinet provided in this application;

[0052] Figure 6 A schematic diagram of the first structure of the phase change thermal storage unit of the energy storage cabinet provided in this application;

[0053] Figure 7 A schematic diagram of the first structure of the phase change thermal storage unit of the energy storage cabinet provided in this application;

[0054] Figure 8 A schematic diagram of the first structure of the phase change thermal storage unit of the energy storage cabinet provided in this application;

[0055] Fig. 9 A schematic diagram of the first structure of the phase change thermal storage unit of the energy storage cabinet provided in this application;

[0056] Fig.10 A third structural schematic diagram of the energy storage cabinet provided for this application;

[0057] Fig.11 A schematic diagram of the connection of the third structure of the energy storage cabinet provided in this application;

[0058] Fig.12 A fourth structural schematic diagram of the energy storage cabinet provided for this application;

[0059] Fig.13 A schematic diagram of the fourth structure of the energy storage cabinet provided in this application;

[0060] Fig.14 A fifth structural schematic diagram of the energy storage cabinet provided in this application;

[0061] Fig.15 A schematic diagram of the connectivity of the fifth structure of the energy storage cabinet provided in this application.

[0062] Description of reference numerals:

[0063] 20. Energy storage cabinet; 21. Energy storage device; 22. Power conversion device;

[0064] 10. Thermal management device; 11. Cooling fan; 1101. First fan; 1102. Second fan;

[0065] 100, first circuit unit; 110, first heat exchange pipeline; 120, refrigeration unit; 121, compressor; 122, condenser; 123, plate heat exchanger; 130, heater; 140, first auxiliary pipeline; 150, second auxiliary pipeline; 160, third auxiliary pipeline; 170, first pump; 180, first air-liquid heat exchanger;

[0066] 200, second circuit unit; 210, second heat exchange pipeline; 220, second air-liquid heat exchanger; 230, second pump;

[0067] 300, phase change thermal storage unit; 301, first cavity; 302, second cavity; 303, phase change cavity;

[0068] 310, first flow channel; 311, first flow section; 320, second flow channel; 321, second flow section; 330, phase change section;

[0069] 340, shell; 341, partition; 342, sealing ring; 343, first top flow opening; 344, second top flow opening; 345, first bottom flow opening; 346, second bottom flow opening;

[0070] 410, upper cover; 411, first opening; 412, second opening; 413, third opening; 414, fourth opening;

[0071] 400, multi-way valve;

[0072] 410, three-way valve; 411, first valve port; 412, second valve port; 413, third valve port;

[0073] 420, four-way valve; 421, fourth valve port; 422, fifth valve port; 423, sixth valve port; 424, seventh valve port.

[0074] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0075] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar devices or devices with the same or similar functions. The described embodiments are embodiments of a part of the device of the present application, rather than embodiments of the entire device. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0076] Reference Figure 1 In a first aspect, an embodiment of the present application provides an energy storage cabinet 20 , comprising an energy storage device 21 , a power conversion device 22 and a thermal management device 10 .

[0077] The energy storage device 21 is usually composed of a plurality of battery modules, and the energy storage device 21 can be installed on one side of the energy storage cabinet 20. The power conversion device 22, such as an energy storage inverter, can be installed on the other side of the energy storage cabinet 20. Some components of the thermal management device 10 are in thermal contact with the energy storage device 21 and the power conversion device 22, and are responsible for regulating and managing the temperature of the energy storage device 21 and the power conversion device 22.

[0078] Reference Figure 1 and Figure 2 In a second aspect, the embodiment of the present application further provides a thermal management device 10. Specifically, the thermal management device 10 includes a first circuit unit 100, a second circuit unit 200 and a phase change thermal storage unit 300.

[0079] The first circuit unit 100 includes a first heat exchange pipe 110, and the second circuit unit 200 includes a second heat exchange pipe 210. Coolant flows through both the first circuit unit 100 and the second circuit unit 200. Exemplarily, coolant can flow through both the first heat exchange pipe 110 of the first circuit unit 100 and the second heat exchange pipe 210 of the second circuit unit 200.

[0080] It is understandable that the coolant can be selected according to actual conditions. For example, the coolant can be water, ethylene glycol aqueous solution, etc. The embodiment of the present application does not limit the type of coolant flowing in the first heat exchange pipe 110 and the second heat exchange pipe 210, nor is it limited to the above examples.

[0081] It should be noted that a heat exchange structure may be provided in the energy storage device 21 and the power conversion device 22, and the heat exchange structure transfers heat with the first circuit unit 100 or the second circuit unit 200 to remove heat during operation or obtain heat when the temperature is insufficient.

[0082] In some embodiments, the coolant of the first circuit unit 100 is used to exchange heat with the energy storage device 21. Specifically, the coolant in the first heat exchange pipe 110 can flow through the heat exchange structure of the energy storage device 21, that is, the first heat exchange pipe 110 is connected to the heat exchange structure of the energy storage device 21, so that the coolant of the first circuit unit 100 can flow through the heat exchange structure to cool or heat the energy storage device 21. The coolant of the second circuit unit 200 exchanges heat with the power conversion device 22. Specifically, the coolant in the second heat exchange pipe 210 can flow through the heat exchange structure of the power conversion device 22, that is, the second heat exchange pipe 210 is connected to the heat exchange structure of the power conversion device 22, so that the coolant of the first circuit unit 100 can flow through the heat exchange structure to cool the power conversion device 22. Heat exchange between components can be achieved specifically through direct or indirect thermal contact. Coolant is also a component.

[0083] In other embodiments, the first heat exchange pipe 110 may be in thermal contact with the heat exchange structure of the energy storage device 21, thereby indirectly exchanging heat between the coolant of the first circuit unit 100 and the heat exchange structure of the energy storage device 21; similarly, the second heat exchange pipe 210 may be in thermal contact with the heat exchange structure of the power conversion device 22, thereby indirectly exchanging heat between the coolant of the second circuit unit 200 and the heat exchange structure of the power conversion device 22. In this embodiment, the heat exchange structure does not need to be provided with a coolant circulation channel, and it is only necessary to make the corresponding heat exchange pipe and the heat exchange structure fully in thermal contact, which is conducive to reducing the design difficulty of the heat exchange structure.

[0084] The phase change thermal storage unit 300 includes phase change materials, such as paraffin or salt-based materials, which can absorb or release a large amount of heat during the phase change process.

[0085] The first circuit unit 100 and the second circuit unit 200 are independent of each other, and can perform targeted temperature control on the energy storage device 21 and the power conversion device 22, thereby improving the flexibility and efficiency of thermal management; moreover, the two circuit units are convenient for maintenance and overhaul, and the cooling system of the energy storage device 21 or the power conversion device 22 can be maintained separately without affecting the other part.

[0086] The phase-change heat storage unit 300 is connected in series with one of the first heat exchange pipe 110 and the second heat exchange pipe 210 , and is connected in parallel with the other of the first heat exchange pipe 110 and the second heat exchange pipe 210 .

[0087] It should be noted that series connection means that the two are directly connected.

[0088] In some embodiments, the phase change thermal storage unit 300 is connected in series with the first heat exchange pipe 110. At this time, the coolant in the first heat exchange pipe 110 can enter the phase change thermal storage unit 300 after passing through the energy storage device 21 (specifically, passing through the heat exchange structure of the energy storage device 21), and the phase change thermal storage unit 300 can perform heat exchange with the coolant to complete heat absorption or heat release of the coolant flowing through the first heat exchange pipe 110.

[0089] In some embodiments, the phase change heat storage unit 300 is connected in parallel with the first heat exchange pipe 110. At this time, the coolant in the first heat exchange pipe 110 can enter the phase change heat storage unit 300 after passing through the power conversion device 22 (specifically, after passing through the heat exchange structure of the power conversion device 22), and the phase change heat storage unit 300 can exchange heat with the coolant to complete the heat absorption or heat release of the coolant flowing through the first heat exchange pipe 110.

[0090] It should be noted that parallel connection means the selective flow of the two.

[0091] In some embodiments, the phase change heat storage unit 300 is connected in parallel with the first heat exchange pipe 110. At this time, the coolant in the first heat exchange pipe 110 may pass through the phase change heat storage unit 300, or may not pass through the phase change heat storage unit 300. It can be adjusted according to actual conditions.

[0092] In some embodiments, the phase change thermal storage unit 300 is connected in parallel with the second heat exchange pipe 210. At this time, the coolant in the first heat exchange pipe 110 may pass through the phase change thermal storage unit 300, or may not pass through the phase change thermal storage unit 300. It can be adjusted according to actual conditions.

[0093] The energy storage cabinet 20 provided in the embodiment of the present application, by providing a first circuit unit 100 and a second circuit unit 200, respectively and independently connects the energy storage device 21 and the power conversion device 22, so that the temperature of the energy storage device 21 and the power conversion device 22 can be controlled in a targeted manner, thereby improving the flexibility and efficiency of thermal management; and the two circuit units are convenient for maintenance and overhaul, and the cooling system of the energy storage device 21 or the power conversion device 22 can be maintained separately without affecting the other part.

[0094] By adding the phase change thermal storage unit 300, the characteristics of the phase change material that absorbs and releases a large amount of heat during the phase change process can be utilized to effectively balance the temperatures of the energy storage device 21 and the power conversion device 22, thereby improving the efficiency of thermal management; in addition, the phase change thermal storage unit 300 helps to avoid rapid changes in temperature and improve the reliability of the energy storage cabinet 20.

[0095] In this way, it is possible to ensure that the batteries in the energy storage device 21 work within a suitable temperature range, reduce the aging rate of the batteries, extend the service life of the batteries, reduce the risk of battery overheating and thermal runaway, thereby improving the safety of the energy storage cabinet 20 and avoiding safety accidents such as fire and explosion. In addition, it is possible to ensure that the power conversion device 22 works within a suitable temperature range, avoiding the power conversion device 22 working for too long and releasing too much heat to affect normal operation.

[0096] The design of the phase change heat storage unit 300 being connected in series with one of the first heat exchange pipe 110 and the second heat exchange pipe 210 and in parallel with the other one allows the coolant to first exchange heat through the phase change heat storage unit 300 during the flow process, and then transfer the heat to another circuit. This can more effectively utilize the heat exchange capacity of the phase change heat storage unit 300 and improve the overall thermal management performance.

[0097] By using series connection and parallel connection between the two circuit units and the phase change thermal storage unit 300, the energy storage cabinet 20 can make the phase change thermal storage unit 300 perform heat exchange on different circuits separately under appropriate circumstances, thereby improving the heat exchange efficiency.

[0098] Through the aforementioned thermal management device 10, the energy storage cabinet 20 can adapt to different detection temperatures, ensuring that the energy storage device 21 and the power conversion device 22 can work normally even at extreme temperatures. By maintaining effective thermal management, the degradation of battery performance caused by excessive temperature can be reduced, and the overall energy efficiency and safety of the energy storage cabinet 20 can be improved.

[0099] It should be noted that, in order to ensure that the coolant flows through the first heat exchange pipe 110 and the second heat exchange pipe 210 , pumps are provided on the first circuit unit 100 and the second circuit unit 200 .

[0100] Reference Figure 2 As an optional implementation, the first circuit unit 100 further includes a refrigeration unit 120 and a heater 130 , and both the refrigeration unit 120 and the heater 130 can cool or heat the coolant in the first circuit unit 100 .

[0101] The refrigeration unit 120 is used to reduce the temperature of the coolant in the first heat exchange pipe 110 (that is, the coolant of the first circuit unit 100). The refrigeration unit 120 can be implemented by compressor refrigeration, thermoelectric refrigeration, etc. In the embodiment of the present application, the refrigeration unit 120 uses compression refrigeration. The refrigeration unit 120 is used to ensure that the temperature of the energy storage device 21 can be effectively reduced to prevent overheating when the detected temperature is high or the battery generates a large amount of heat.

[0102] The heater 130 is used to increase the temperature of the coolant in the first heat exchange pipe 110 (i.e., the coolant of the first circuit unit 100). This is more important when the detected temperature is low, and can be achieved by an electric heater or the like. The function of the heater 130 is to ensure that the temperature of the energy storage device 21 can be maintained within a suitable range in a low temperature environment to prevent the battery performance from deteriorating.

[0103] By providing the refrigeration unit 120 and the heater 130 in the first loop unit 100 , accurate temperature control of the energy storage device 21 can be achieved to adapt to different environmental conditions and improve the performance and life of the energy storage device 21 .

[0104] In some embodiments, the phase change heat storage unit 300 is directly connected to the second heat exchange pipe 210, and the phase change heat storage unit 300 is selectively connected to the first heat exchange pipe 110. That is, the phase change heat storage unit 300 is always connected to the second heat exchange pipe 210, and the coolant in the second circuit unit 200 must pass through the phase change heat storage unit 300 after flowing through the power conversion device 22. In this way, the phase change heat storage unit 300 can absorb or release heat through the heat capacity characteristics of the phase change material to balance the temperature of the power conversion device 22.

[0105] Through direct connection, it is ensured that the temperature fluctuation of the power conversion device 22 is effectively buffered, thereby avoiding unstable performance caused by excessive temperature changes, and improving the reliability of the power conversion device 22.

[0106] In some embodiments, the phase-change thermal storage unit 300 can be connected to or disconnected from the first heat exchange pipe 110 as needed.

[0107] Selective connectivity can provide higher flexibility, allowing the thermal capacity characteristics of the phase change material to be used for adjustment when the temperature of the energy storage device 21 fluctuates greatly, and can be disconnected when the temperature is stable to save energy and resources. The above setting helps to optimize the overall efficiency of the thermal management system.

[0108] Reference Figure 1 As an optional implementation, the phase change thermal storage unit 300 includes a first flow channel 310 , a second flow channel 320 and a phase change portion 330 . At this time, the thermal management device 10 may further include a multi-way valve 400 .

[0109] Specifically, the first flow channel 310 and the second flow channel 320 are two independent channels in the phase change thermal storage unit 300, which are used for different circuit units respectively. Through the above arrangement, the two circuit units operate independently in the phase change thermal storage unit 300, avoiding direct heat transfer between the two circuits, thereby improving the flexibility and efficiency of thermal management.

[0110] The first flow channel 310 and the second flow channel 320 are arranged at intervals through the phase change portion 330. The phase change portion 330 is made of a phase change material. The phase change portion 330 can effectively absorb or release heat when the temperature changes, thereby balancing the temperature of the energy storage device 21 and the power conversion device 22, helping to avoid rapid changes in temperature and improving the stability and reliability of the energy storage cabinet 20.

[0111] The first flow channel 310 is selectively connected to the first heat exchange pipeline 110 through the multi-way valve 400 , and the second flow channel 320 is directly connected to the second heat exchange pipeline 210 .

[0112] Through the above arrangement, the coolant in the first heat exchange pipe 110 can selectively pass through the phase change thermal storage unit 300, and the coolant in the second heat exchange pipe 210 can directly pass through the phase change thermal storage unit 300. The above arrangement can improve the utilization rate of the phase change thermal storage unit 300 and ensure that heat exchange can be effectively performed when needed.

[0113] The multi-way valve 400 is used to control the connection between the first flow channel 310 and the first heat exchange pipe 110 so that they can be connected in parallel, so that the coolant can selectively flow through the phase change thermal storage unit 300 .

[0114] Through the control of the multi-way valve 400, the thermal management device 10 can adjust the flow path of the coolant according to actual needs, and dynamically adjust to achieve better temperature control, thereby optimizing the thermal management process.

[0115] Reference Figure 1 As an optional implementation, the phase change portion 330 is in thermal contact with the first flow channel 310 and the second flow channel 320 .

[0116] It can be seen from the above that heat-conducting contact means that the phase change material is in direct contact with the coolant in the flow channel or is in indirect contact with the coolant through the heat-conducting material, and the phase change material and the coolant in the flow channel can perform effective heat exchange.

[0117] By bringing the phase change portion 330 into thermal contact with the flow channel, efficient heat exchange between the phase change material and the coolant in the flow channel can be achieved. When the temperature of the coolant in the flow channel increases, the phase change material absorbs heat and undergoes a phase change, and vice versa, which helps to balance the temperature fluctuations in the flow channel.

[0118] The phase change process of the phase change material can absorb or release a large amount of heat, thereby providing a buffer during temperature fluctuations, helping to maintain the temperature stability of the energy storage device 21 and the power conversion device 22, and avoiding performance instability caused by excessive temperature changes.

[0119] Since the phase change portion 330 can be in thermal contact with the first flow channel 310 and the second flow channel 320 , the thermal management device 10 can selectively utilize the heat capacity characteristics of the phase change material to adjust the temperature as needed.

[0120] The ability of phase change materials to absorb and release heat during the phase change process reduces the need for external heating or cooling, thereby reducing energy consumption and improving overall energy efficiency.

[0121] Reference Figure 3 As an optional implementation, the first flow channel 310 has a plurality of first flow segments 311 connected end to end in sequence, and a plurality of continuous flow segments are connected in sequence to form a complete flow path.

[0122] The extension directions of a part of the first flow segments 311 intersect, that is, in the first flow channel 310, some of the flow segments intersect with each other, which can increase the length and complexity of the flow channel, thereby increasing the contact area and time with the phase change material.

[0123] By increasing the complexity of the flow channels and extending the flow path of the coolant, the heat exchange efficiency between the coolant and the phase change material can be improved, which helps to effectively utilize the heat capacity characteristics of the phase change material and enhance the temperature regulation ability.

[0124] The second flow channel 320 has a plurality of second flow segments 321 connected end to end in sequence, and the extension directions of a portion of the second flow segments 321 intersect. The second flow channel 320 is similar to the first flow channel 310 and will not be described in detail herein.

[0125] The phase change portion 330 is located between at least a portion of the first flow sections 311 and the corresponding second flow sections 321 , so that the phase change material can simultaneously exchange heat with the coolant in the two flow channels.

[0126] Through the above configuration, the phase change material can simultaneously adjust the temperature of the energy storage device 21 and the power conversion device 22. The aforementioned dual adjustment capability improves the thermal management efficiency of the thermal management device 10, ensuring that both the energy storage device 21 and the power conversion device 22 can operate within a preferred temperature range.

[0127] Reference Figure 3 As an optional implementation, the extension directions of a part of the first flow segments 311 are intersecting, and the extension directions of a part of the second flow segments 321 are intersecting. The design of intersecting flow segments can improve the heat exchange efficiency between the coolant and the phase change material, help to distribute heat more evenly, and enhance the temperature regulation ability, especially when the heat load is uneven.

[0128] Any first flow section 311 is arranged in parallel with the corresponding second flow section 321. The parallel arrangement can ensure the structural symmetry and heat exchange consistency between the two flow channels.

[0129] Through the above arrangement, the parallel flow channels can provide a more uniform temperature gradient and a more stable heat flow path, which helps to ensure that the phase change material can simultaneously adjust the temperature of the energy storage device 21 and the power conversion device 22, thereby improving the overall thermal management efficiency.

[0130] Reference Figure 3 As an optional implementation, the phase change thermal storage unit 300 includes a shell 340 , and the first flow channel 310 , the second flow channel 320 and the phase change part 330 are all located in the shell 340 .

[0131] The housing 340 can provide physical protection and structural support, ensuring that the flow channel and phase change material operate in a controlled environment, helping to reduce the impact of the external environment on the thermal management system and improving the reliability and durability of the thermal management system and the energy storage cabinet 20.

[0132] It is understandable that the phase change thermal storage unit 300 has different shapes, which are exemplified below.

[0133] Reference Figure 4In some embodiments, the phase change thermal storage unit 300 has a first cavity 301, a second cavity 302 and a phase change cavity 303. The first cavity 301 is connected to the first flow channel 310, the second cavity 302 is connected to the second flow channel 320, and the phase change part 330 is located in the phase change cavity 303, that is, each flow channel is provided with a corresponding cavity for the flow of coolant and heat exchange.

[0134] Through the above arrangement, the thermal management device 10 can effectively manage the heat load of different flow channels. On this basis, the interval arrangement of the first cavity 301 and the second cavity 302 can ensure that the temperature regulation of the energy storage device 21 and the power conversion device 22 can be performed independently, thereby improving the accuracy of thermal management.

[0135] The phase change cavity 303 is closely attached to at least one of the first cavity 301 and the second cavity 302 .

[0136] The close contact of the phase change cavity 303 can increase the contact area between the phase change material and the flow channel, and enhance the heat exchange efficiency. Through the aforementioned thermal coupling, the phase change material can quickly respond to temperature changes, provide timely heat buffering and regulation, reduce the risk of overheating and thermal runaway, and improve the safety of the energy storage cabinet 20.

[0137] Reference Figure 4 , Figure 5 In some embodiments, the number of the first cavity 301 , the second cavity 302 and the phase change cavity 303 are all multiple, and the multiple first cavities 301 and the second cavities 302 are arranged alternately in sequence.

[0138] By providing multiple cavities in a staggered arrangement, the contact frequency and area between the coolant and the phase change material can be increased, thereby enhancing the heat exchange efficiency, helping to evenly distribute the heat load and improving the accuracy of temperature regulation.

[0139] Reference Figure 6 The shell 340 includes multiple partitions 341 and multiple sealing rings 342. The multiple partitions 341 and the multiple sealing rings 342 are arranged alternately in sequence. Two adjacent partitions 341 and the corresponding sealing rings 342 are jointly arranged to form a first cavity 301, a second cavity 302 and a phase change cavity 303.

[0140] The housing 340 enables each cavity to perform thermal management independently and effectively. The cavities can be modularized, and the housing 340 can be expanded as a whole. By using the sealing ring 342, the sealing between the cavities can be ensured, the leakage of the coolant can be prevented, and the reliability of the thermal management device 10 and the energy storage cabinet 20 can be improved.

[0141] A first top flow opening 343 and a second top flow opening 344 are respectively disposed on the left and right sides of the top of the partition 341 , and a first bottom flow opening 345 and a second bottom flow opening 346 are respectively disposed on the left and right sides of the bottom of the partition 341 .

[0142] It is understandable that the first top flow opening 343 , the second top flow opening 344 , the first bottom flow opening 345 and the second bottom flow opening 346 may be respectively located at the corners of the partition 341 to increase the distance of the flow path.

[0143] Through the above arrangement, the coolant flows alternately between different cavities, which can increase the complexity of the flow path and the residence time of the coolant, thereby improving the heat exchange efficiency.

[0144] The first flow channel 310 alternately connects the first top flow opening 343 and the second bottom flow opening 346 to connect the first cavity 301 ; the second flow channel 320 alternately connects the second top flow opening 344 and the first bottom flow opening 345 to connect the second cavity 302 .

[0145] Through the above arrangement, the first flow channel 310 and the second flow channel 320 are interlaced and connected, so that the coolant can fully exchange heat with the phase change material during the flow process. In this way, not only the efficiency of thermal management is improved, but also the uniformity of temperature regulation is ensured, and the risk of local overheating is reduced.

[0146] Reference Figure 7 In some embodiments, the housing 340 includes an aluminum extruded shell. Aluminum has a high thermal conductivity, which helps to quickly conduct heat, evenly distribute temperature, and reduce the risk of local overheating. In addition, the structural strength and lightweight characteristics of the aluminum extruded shell improve the durability and portability of the phase change thermal storage unit 300.

[0147] The aluminum extruded shell has a plurality of phase change cavities 303, and the plurality of phase change cavities 303 are arranged in an array in the aluminum extruded shell. The phase change cavities 303 arranged in an array can increase the contact area and frequency between the phase change material and the coolant, thereby improving the heat exchange efficiency, helping to evenly distribute the heat load, and improving the accuracy and response speed of temperature regulation.

[0148] The multiple phase change cavities 303 are respectively located on both sides of the first cavity 301 and the second cavity 302. By placing the phase change cavities 303 on both sides of the first cavity 301 and the second cavity 302, the phase change material can simultaneously adjust the temperature of the energy storage device 21 and the power conversion device 22, which can improve the overall thermal management efficiency of the thermal management device 10 to ensure that the energy storage device 21 and the power conversion device 22 can both operate within a preferred temperature range.

[0149] In some embodiments, the first flow channel 310 and the second flow channel 320 are spaced apart in the housing 340. The spaced flow channel design helps reduce thermal interference, allowing each flow channel to independently perform heat exchange, which can improve the thermal management efficiency of the thermal management device 10.

[0150] The phase change portion 330 covers the periphery of the first flow channel 310 and the second flow channel 320. By covering the periphery of the flow channel with the phase change portion 330, the phase change material can effectively absorb and release the heat conducted by the flow channel, which can improve the heat exchange efficiency, ensure rapid response to temperature changes, and provide stable temperature regulation.

[0151] Reference Figure 8 In some embodiments, the housing 340 includes a cylindrical shell, and the first flow channel 310 and the second flow channel 320 are both in a coil shape.

[0152] The cylindrical shell is adapted to the coil-shaped flow channel, which can increase the length of the flow channel and the residence time of the coolant, help improve the heat exchange efficiency, and utilize gravity and fluid dynamics to promote the flow of the coolant.

[0153] The phase change part 330 is filled in the cylindrical shell, and the phase change material completely fills the space outside the flow channel in the shell 340 to ensure close contact with the flow channel.

[0154] The filling of the phase change material can ensure that the heat between the flow channels can be quickly transferred to the phase change material for absorption or release. The above-mentioned close thermal coupling can improve the response speed and temperature stability of the thermal management device 10 and reduce the risk of local overheating and temperature fluctuation.

[0155] Reference Fig. 9 In some embodiments, the housing 340 includes a rectangular shell. The rectangular shell has a certain stability, is easy to install, and helps to optimize space utilization, so that the configuration of the flow channel and the phase change material is more compact and efficient.

[0156] The first flow channel 310 and the second flow channel 320 are both serpentine tubes with multiple bends. The serpentine tubes with multiple bends can increase the length of the flow channel and the residence time of the coolant, thereby improving the heat exchange efficiency. The complex flow path ensures that the coolant can fully exchange heat with the phase change material, thereby enhancing the temperature regulation capability.

[0157] The phase change part 330 is filled in the rectangular shell. The filling of the phase change material can ensure that the heat between the flow channels can be quickly transferred to the phase change material for absorption or release. The above-mentioned close thermal coupling can improve the response speed and temperature stability of the thermal management device 10 and reduce the risk of local overheating and temperature fluctuations.

[0158] Reference Figure 7 or Fig. 9As an optional embodiment, the phase change thermal storage unit 300 further includes an upper cover 350, which is provided with at least a first opening 351, a second opening 352, a third opening 353 and a fourth opening 354. The first opening 351 is adjacent to the third opening 353, the second opening 352 is adjacent to the fourth opening 354, and the first opening 351 and the second opening 352 are located on opposite sides of the upper cover 350. The openings are used to connect the flow channel and allow the coolant to enter and exit.

[0159] It is understood that the upper cover 350 can provide a closed structure to ensure the safety and sealing of the internal components. The opening allows the flow channel to communicate with the outside to form a complete cooling circuit.

[0160] The arrangement of the openings described above enables the flow channels to form staggered flow paths within the housing 340. Adjacent and opposite openings help optimize fluid flow, reduce flow resistance, and ensure uniform distribution of the coolant in the flow channels.

[0161] Reference Fig. 9 In some embodiments, two ends of the first flow channel 310 are connected to the first opening 351 and the second opening 352 respectively, and two ends of the second flow channel 320 are connected to the third opening 353 and the fourth opening 354 respectively.

[0162] Ensure that each flow channel forms an independent circulation path, allowing the coolant to circulate effectively in the system. Through this design, the first flow channel 310 and the second flow channel 320 can independently perform heat exchange, reduce mutual interference, and improve the thermal management efficiency of the thermal management device 10 and the energy storage cabinet 20.

[0163] Through precise opening configuration and flow channel connection, the thermal management device 10 and the energy storage cabinet 20 can achieve efficient fluid management, ensuring that the coolant can flow through the phase change material quickly and evenly to achieve the best heat exchange effect.

[0164] Reference Figure 7 In some embodiments, two ends of the first flow channel 310 are connected to the first opening 351 and the third opening 353 respectively, and two ends of the second flow channel 320 are connected to the second opening 352 and the fourth opening 354 respectively.

[0165] The above-mentioned connection mode can ensure that each flow channel forms an independent circulation path, so that the coolant can circulate effectively in the thermal management device 10. Through this design, the first flow channel 310 and the second flow channel 320 can independently perform heat exchange, reduce mutual interference, and improve the thermal management efficiency of the thermal management device 10. Independent flow channel circulation also helps to accurately control the temperature regulation of each flow channel.

[0166] Through precise opening configuration and flow channel connection, the thermal management device 10 can achieve efficient fluid management, ensuring that the coolant can flow through the phase change material quickly and evenly, thereby achieving a better heat exchange effect.

[0167] Reference Fig.10 , Fig.12 and Fig.14 As an optional embodiment, the first circuit unit 100 further includes a first pump 170, a refrigeration unit 120, a heater 130 and the aforementioned first air-to-liquid heat exchanger 180. The first pump 170 and the first air-to-liquid heat exchanger 180 are both connected to the first heat exchange pipe 110; the refrigeration unit 120 is used to cool the coolant flowing through the first heat exchange pipe 110; the heater 130 is used to heat the coolant flowing through the first heat exchange pipe 110.

[0168] In some embodiments, the refrigeration unit 120 is a refrigeration system, including a condenser 122 , a compressor 121 , a plate exchanger 123 and a throttle valve; the condenser 122 , the compressor 121 and the throttle valve are connected to the first heat exchange pipe 110 through the plate exchanger 123 .

[0169] Among them, the refrigeration unit 120 adjusts the temperature of the coolant through compression, condensation, and heat exchange. The compressor 121 increases the pressure and temperature of the refrigerant, the condenser 122 liquefies the refrigerant by heat dissipation, and the second air-to-liquid heat exchanger 220 exchanges heat by contacting with the coolant. The throttle valve is used to reduce the pressure of the coolant. The refrigeration unit 120 can provide a certain active temperature regulation capability, which can effectively reduce the temperature inside the energy storage cabinet 20 under high temperature conditions.

[0170] In some embodiments, the second circuit unit 200 further includes a second air-to-liquid heat exchanger 220 and a second pump 230. The second pump 230 and the second air-to-liquid heat exchanger 220 are both connected to the second heat exchange pipe 210. The second pump 230 is used to drive the coolant to flow. The second air-to-liquid heat exchanger 220 is used to perform heat exchange in the second heat exchange pipe 210 to help manage the temperature of the power conversion device 22. Through effective heat exchange, the second air-to-liquid heat exchanger 220 can independently adjust the temperature of the second heat exchange pipe 210 without affecting the first heat exchange pipe 110, thereby improving the efficiency of the thermal management device 10.

[0171] In some embodiments, the thermal management device 10 further includes a heat dissipation fan 11. On the basis that the first circuit unit 100 and the second circuit unit 200 respectively include the above-mentioned condenser 122 and the second air-liquid heat exchanger 220. The heat dissipation fan 11 corresponds to at least one of the second air-liquid heat exchanger 220 and the condenser 122. It can be understood that the heat dissipation fan 11 can correspond to the second air-liquid heat exchanger 220 such as the second fan 1102, or can correspond to the condenser 122 such as the first fan 1101; it can also be located between the second air-liquid heat exchanger 220 and the condenser 122 such as the third fan (not shown in the figure), so as to simultaneously cool the second air-liquid heat exchanger 220 and the condenser 122.

[0172] The cooling fan 11 enhances the heat dissipation capacity of the condenser 122 and / or the second air-to-liquid heat exchanger 220 by forcing air flow, which helps to accelerate the discharge of heat, improve the condensation efficiency and heat exchange efficiency, and ensure the normal operation of the refrigeration unit 120 and the second air-to-liquid heat exchanger 220.

[0173] As an optional implementation, the energy storage cabinet 20 has a first working state and a second working state that are switchable with each other;

[0174] When the energy storage cabinet 20 is in the first working state, the energy storage device 21, the power conversion device 22 and the thermal management device 10 are all working; this state usually corresponds to normal energy storage and conversion operations, that is, the energy storage cabinet 20 is in the charging and discharging process. The phase change heat storage unit 300 is not in circulation with the first heat exchange pipe 110 and is connected to the second heat exchange pipe 210, which does not affect the temperature control of the energy storage device 21 by the first circuit unit 100. At the same time, the temperature of the power conversion device 22 can be balanced to ensure that when the power conversion device 22 is under high load or for a long time, part of the heat generated by the power conversion device 22 can be absorbed by the phase change material to prevent its temperature from continuing to rise, thereby reducing the amount of heat that needs to be diffused through the second circuit unit 200, reducing the power consumed by the cooling fan 11, and controlling the temperature fluctuation of the phase change material, while reducing energy loss on the basis of reliability.

[0175] The cooling fan 11 here refers to the first fan 1101 in the first circuit unit 100, and may also refer to the second fan 1102 in the second circuit unit 200, or may also refer to the third fan acting in both the first circuit unit 100 and the second circuit unit 200. The following is a detailed description in the corresponding embodiment.

[0176] When the energy storage cabinet 20 is in the second working state, the energy storage device 21 and the power conversion device 22 are not working, and the thermal management device 10 is working. This state usually corresponds to the standby or maintenance of the energy storage cabinet 20, that is, the energy storage cabinet 20 is in a non-charging and discharging process. The phase change heat storage unit 300 selectively circulates with the first heat exchange pipe 110, and the selective circulation has a certain flexibility, so that the energy storage cabinet 20 can perform temperature management without affecting the main functions, ensuring that the energy storage cabinet 20 is in the optimal temperature condition when re-entering the first working state. The above-mentioned energy storage cabinet 20 can dynamically adjust the working state according to actual needs, thereby improving energy efficiency and responsiveness.

[0177] It can be understood that in the process of heat absorption and release in the phase change part 330, through selective circulation, the phase change part 330 can delay the release of heat from the second heat exchange pipe 210 to the first heat exchange pipe 110 on the one hand, and can delay the release of heat from the second heat exchange pipe 210 to the second air-liquid heat exchanger 220 on the other hand.

[0178] In some embodiments, the energy storage cabinet 20 further includes a controller, which is used to obtain the working state of the energy storage cabinet 20, and control the communication between the phase change heat storage unit 300 and the first heat exchange pipe 110 according to the working state, so as to balance the temperature of the first heat exchange pipe 110 and the second heat exchange pipe 210. It should be noted that balancing the temperature of the first heat exchange pipe 110 and the second heat exchange pipe 210 is actually balancing the coolant temperature in the channels of the first loop unit 100 and the second loop unit 200.

[0179] The controller can realize automatic thermal management adjustment, improve the intelligence and response speed of the energy storage cabinet 20. Through real-time monitoring and adjustment, it is ensured that the energy storage cabinet 20 can maintain optimal performance and safety under different working conditions.

[0180] As an optional embodiment, the phase change portion 330 has a threshold temperature, which refers to the critical point at which the phase change material changes from one physical state (solid or liquid) to another state. When the temperature of the phase change portion 330 approaches or reaches the threshold temperature, the phase change material begins to absorb or release heat, thereby stabilizing the temperature of the energy storage cabinet 20.

[0181] When the temperature of at least one of the first flow channel 310 and the second flow channel 320 is higher than the threshold temperature, the phase change portion 330 changes from solid to liquid to absorb heat. When the temperature rises, the phase change material absorbs heat to change phase (from solid to liquid), which helps to reduce the temperature in the flow channel, can effectively alleviate the overheating problem, and protect the energy storage device 21 and the power conversion device 22 from high temperature damage.

[0182] When the temperature of at least one of the first flow channel 310 and the second flow channel 320 is lower than the threshold temperature, the phase change portion 330 changes from liquid to solid to absorb heat. When the temperature drops, the phase change material releases heat to change phase (from liquid to solid), which helps to increase the temperature in the flow channel, prevents the temperature from being too low, and ensures that the energy storage device 21 and the power conversion device 22 operate within a suitable temperature range.

[0183] It is understandable that the phase change material can be selected arbitrarily according to the requirements. In the embodiment of the present application, the phase change material can be selected from materials with a threshold temperature of 20°C-50°C, such as paraffin, inorganic salt, etc. The embodiment of the present application is not limited to this, nor is it limited to the above examples.

[0184] As an optional embodiment, when the phase change thermal storage unit 300 includes a first flow channel 310, a second flow channel 320 and a phase change part 330, and the phase change part 330 has a threshold temperature; the energy storage cabinet 20 also includes a temperature sensor electrically connected to the controller, and the temperature sensor is used to obtain the detection temperature.

[0185] The controller has a preset temperature below a threshold temperature for determining whether temperature adjustment is required.

[0186] The controller is configured to obtain the detection temperature provided by the temperature sensor, and control the connection relationship between the multi-way valve 400 and the first flow channel 310 according to the working state, the detection temperature and the preset temperature to balance the temperature of the first heat exchange pipe 110 and the temperature of the second heat exchange pipe 210.

[0187] Through the above settings, the controller can control the multi-way valve 400 according to the working state, the detected temperature and the preset temperature, so as to achieve the temperature balance of the first heat exchange pipe 110 and the second heat exchange pipe 210. The above intelligent control can improve the response speed and accuracy of the thermal management device 10, and ensure that the energy storage cabinet 20 can maintain a better thermal management state under different environmental conditions.

[0188] It is understandable that after balancing the temperature of the first heat exchange pipe 110 and the temperature of the second heat exchange pipe 210, there is a further effect on the thermal management device 10. The following is a detailed description of different situations.

[0189] As an optional implementation, the state of the multi-way valve 400 is controlled to change the state of the phase change unit 330 to achieve better energy-saving thermal management control. Controlling the state of the multi-way valve 400 means controlling the communication relationship between the multi-way valve 400 and the phase change thermal storage unit 300.

[0190] The following details are provided according to different situations:

[0191] Reference Fig.10 and Fig.11As an optional implementation, when the energy storage cabinet 20 is in the first working state, that is, the energy storage cabinet 20 is in the charging and discharging process. In the first working state, both the energy storage device 21 and the power conversion device 22 are in an active state, storing and converting energy. This process usually generates a lot of heat, and effective thermal management is required to maintain the normal operation of the equipment to ensure that the energy storage cabinet 20 can continue to operate under high load conditions to avoid performance degradation or equipment damage due to overheating.

[0192] In some embodiments, if the detected temperature is higher than the preset temperature, for example, the use environment of the energy storage cabinet 20 is high temperature in summer.

[0193] The controller controls the multi-way valve 400 so that the first heat exchange pipe 110 is disconnected from the first flow channel 310 and the second flow channel 320 is connected to the second heat exchange pipe 210. The temperature of the second flow channel 320 gradually rises until it is greater than the threshold temperature. In addition to the second loop unit 200 controlling the temperature of the second heat exchange pipe 210, the phase change part 330 also absorbs heat from the second flow channel 320 until the temperature of the first heat exchange pipe 110 is balanced with the temperature of the second heat exchange pipe 210.

[0194] Through the above configuration, the phase change unit 330 also participates in the heat management of the power conversion device 22 , and utilizes the heat absorption capacity of the phase change material to alleviate the impact of high temperature on the energy storage cabinet 20 , which is beneficial to reducing the energy consumption of the second circuit unit 200 .

[0195] It can be understood that the first circuit unit 100 is connected to the refrigeration part 120 and the heater 130, and the coolant in the first heat exchange pipe 110 can be adjusted to adjust the temperature of the energy storage device 21 in the first circuit unit 100. In summer, the refrigeration part 120 is mainly involved in the work to reduce the temperature of the coolant to achieve the cooling of the energy storage device 21.

[0196] When the temperature of the second flow channel 320 exceeds the threshold temperature of the phase change portion 330, the phase change material begins to absorb heat. During the heat absorption process, the phase change material can effectively reduce the temperature of the second flow channel 320 until it reaches a temperature balance with the temperature of the first heat exchange pipe 110. The heat absorption capacity of the phase change material can alleviate the heat load inside the energy storage cabinet 20 and ensure the stable operation of the energy storage cabinet 20 in a high temperature environment.

[0197] It should be noted that after the phase change portion 330 absorbs the heat of the second flow channel 320, the coolant temperature of the second flow channel 320 will be suppressed from continuing to rise, so that the second fan 1102 does not need to maintain a high power operation, thereby reducing the energy consumption of the second fan 1102. That is, after balancing the temperature of the first heat exchange pipe 110 and the temperature of the second heat exchange pipe 210, the energy consumption of the second fan 1102 can be reduced, thereby reducing the overall energy consumption of the thermal management device 10.

[0198] Reference Fig.10 and Fig.11 In some embodiments, if the detected temperature is lower than a preset temperature, for example, the usage scenario of the energy storage cabinet 20 is winter low temperature.

[0199] The controller controls the multi-way valve 400 so that the first heat exchange pipe 110 is disconnected from the first flow channel 310 and the second flow channel 320 is connected to the second heat exchange pipe 210. The temperature of the second flow channel 320 gradually decreases until it is less than the threshold temperature. The phase change part 330 releases heat into the second flow channel 320 until the temperature of the first heat exchange pipe 110 is balanced with the temperature of the second heat exchange pipe 210.

[0200] In a low temperature environment, a detected temperature that is too low may cause the internal temperature of the energy storage cabinet 20 to be too low, affecting the normal operation and performance of the energy storage device 21 and the power conversion device 22 .

[0201] The first heat exchange pipe 110 is not connected to the first flow channel 310 to ensure that the coolant in the first heat exchange pipe 110 does not directly pass through the phase change portion 330, thereby avoiding excessive heat loss when it is not needed.

[0202] Through the above configuration, the energy storage cabinet 20 can handle the heat management of the power conversion device 22 and adjust the temperature by utilizing the heat release capability of the phase change material.

[0203] When the temperature of the second flow channel 320 gradually decreases and is lower than the threshold temperature of the phase change portion 330, the phase change material begins to release heat. In the process of releasing heat, the phase change material can effectively increase the temperature of the second flow channel 320 until it reaches equilibrium with the temperature of the first heat exchange pipe 110. The heat release capacity of the phase change material can ensure the stability of the internal temperature of the energy storage cabinet 20 and prevent the influence of too low temperature on the performance of the equipment.

[0204] That is, after balancing the temperature of the first heat exchange pipe 110 and the temperature of the second heat exchange pipe 210, the coolant temperature of the second flow channel 320 can be suppressed from decreasing, and the heat balance of the thermal management device 10 can be maintained, thereby achieving heat preservation of the power conversion device 22.

[0205] Reference Fig.10 and Fig.11 As an optional implementation, when the energy storage cabinet 20 is in the second working state, that is, when the energy storage cabinet 20 is not in the charging or discharging process, the energy storage device 21 and the power conversion device 22 do not perform energy conversion operations and may be in a standby or maintenance state. The thermal management device 10 is mainly used to maintain the safe temperature range of the energy storage cabinet 20 and reduce the impact of the detection temperature on the energy storage cabinet 20.

[0206] In some embodiments, if the detected temperature is higher than the preset temperature, for example, the use environment of the energy storage cabinet 20 is high temperature in summer.

[0207] The controller controls the multi-way valve 400 so that the first heat exchange pipe 110 is disconnected from the first flow channel 310 and the second flow channel 320 is connected to the second heat exchange pipe 210. The temperature of the second flow channel 320 gradually rises until it is greater than the threshold temperature. The phase change part 330 absorbs the heat of the second flow channel 320 until the temperature of the first heat exchange pipe 110 is balanced with the temperature of the second heat exchange pipe 210.

[0208] It should be noted that, in the present application, the temperature balance between the first heat exchange pipe 110 and the second heat exchange pipe 210 further refers to the temperature balance of the coolant flowing through the two heat exchange pipes, that is, the temperature balance of the coolant in the first circuit unit 100 and the second circuit unit 200.

[0209] Through the above configuration, the phase change unit 330 can handle the heat management of the power conversion device 22 and utilize the heat absorption capacity of the phase change material to alleviate the impact of high temperature on the energy storage cabinet 20 .

[0210] It is understandable that the first circuit unit 100 is connected to the refrigeration unit 120 and the heater 130 , and the coolant in the first heat exchange pipe 110 can be adjusted to adjust the temperature of the energy storage device 21 in the first circuit unit 100 .

[0211] When the temperature of the second flow channel 320 exceeds the threshold temperature of the phase change portion 330, the phase change material begins to absorb heat. During the heat absorption process, the phase change material can effectively reduce the temperature of the second flow channel 320 until it reaches a temperature balance with the temperature of the first heat exchange pipe 110. The heat absorption capacity of the phase change material can alleviate the heat load inside the energy storage cabinet 20 and ensure the stable operation of the energy storage cabinet 20 in a high temperature environment.

[0212] Reference Fig.12 and Fig.13 In some embodiments, if the detected temperature is lower than a preset temperature, for example, the usage scenario of the energy storage cabinet 20 is winter low temperature.

[0213] The controller controls the multi-way valve 400 to connect the first heat exchange pipe 110 with the first flow channel 310 and the second flow channel 320 with the second heat exchange pipe 210. The temperatures of the first flow channel 310 and the second flow channel 320 gradually decrease until the temperature of the first flow channel 310 is lower than the threshold temperature. The phase change part 330 releases heat into the first flow channel 310 until the temperatures of the first heat exchange pipe 110 and the second heat exchange pipe 210 are balanced.

[0214] It can be understood that after releasing the heat, the phase change unit 330 returns to a state where it can absorb heat, so that it can absorb heat when the power conversion device 22 works next time, and this cycle repeats.

[0215] In a low temperature environment, a detected temperature that is too low may cause the internal temperature of the energy storage cabinet 20 to be too low, affecting the normal operation and performance of the energy storage device 21 and the power conversion device 22 .

[0216] The first heat exchange pipe 110 is connected to the first flow channel 310 so that the coolant in the first heat exchange pipe 110 can exchange heat through the phase change portion 330, directly affecting the temperature of the energy storage device 21. At this time, the coolant in the second heat exchange pipe 210 exchanges heat through the phase change portion 330. In this way, the phase change portion 330 suppresses the coolant temperature in the first flow channel 310 from further decreasing, thereby achieving heat preservation of the energy storage device 21.

[0217] That is, after balancing the temperature of the first heat exchange pipe 110 and the temperature of the second heat exchange pipe 210, the coolant temperature of the first flow channel 310 can be suppressed from decreasing, maintaining the heat balance of the thermal management device 10, thereby achieving heat preservation of the energy storage device 21.

[0218] In the process of changing from the first working state to the second working state, the heat absorbed by the phase change part 330 in the first working state can be released, and the heat can enter the first heat exchange pipe 110 and the second heat exchange pipe 210 respectively through the first flow channel 310 and the second flow channel 320. In this way, the phase change part 330 delays the release of the heat of the second heat exchange pipe 210 to the first heat exchange pipe 110, and delays the release of the heat of the second heat exchange pipe 210 to the second air-liquid heat exchanger 220.

[0219] In this way, the heater 130 in the first circuit unit 100 does not need to maintain a relatively high power operation, which can reduce the power consumption of the heater 130 and further reduce the overall power consumption of the energy storage cabinet 20 .

[0220] When the temperature of the first flow channel 310 is lower than the threshold temperature, the phase change material begins to release the stored heat into the first flow channel 310 to help increase the flow channel temperature. The heat release capacity of the phase change material can ensure the stability of the internal temperature of the energy storage cabinet 20 and prevent the impact of low temperature on equipment performance.

[0221] During this process, the heat release process of the phase change part 330 continues until the temperatures of the two heat exchange pipes reach equilibrium. Through the heat regulation effect of the phase change material, the energy storage cabinet 20 can effectively maintain the internal temperature balance in a low temperature environment, ensuring that the energy storage device 21 and the power conversion device 22 will not be damaged under low temperature conditions.

[0222] It is understandable that the multi-way valve 400 between the first flow channel 310 and the first heat exchange pipe 110 can have various forms, all of which can achieve selective flow. The following examples are provided:

[0223] Reference Fig.11 and Fig.13As an optional implementation, the multi-way valve 400 is a three-way valve 410, and the three-way valve 410 has a first valve port 411, a second valve port 412 and a third valve port 413 that are interconnected.

[0224] The first valve port 411 is connected to the input end of the first heat exchange pipe 110, and is used to receive the coolant from the first heat exchange pipe 110. The second valve port 412 is connected to the output end of the first heat exchange pipe 110, and is used to return the coolant to the first heat exchange pipe 110. The third valve port 413 is connected to the input end of the first flow channel 310, and is used to introduce the coolant into the first flow channel 310.

[0225] The three-way valve 410 can flexibly control the flow direction of the coolant and can be switched under different conditions to optimize thermal management.

[0226] The first circuit unit 100 further includes a first auxiliary pipe 140 connected to the first heat exchange pipe 110, one end of which is connected to the output end of the first flow channel 310 for receiving the coolant from the first flow channel 310. The other end is connected to the output end of the first heat exchange pipe 110 for returning the coolant to the first heat exchange pipe 110.

[0227] The first auxiliary pipe 140 can provide an additional flow path for the coolant to enhance the flexibility and efficiency of thermal management. The coolant in the thermal management device 10 directly returns to the heat exchange pipe after passing through the phase change portion 330, thereby optimizing the heat exchange process.

[0228] Through the combination of the three-way valve 410 and the auxiliary pipeline, the energy storage cabinet 20 can flexibly adjust the flow path of the coolant under different temperature conditions and working conditions, which can improve the adaptability and response speed of the energy storage cabinet 20. The coolant can circulate between different structures to ensure that the phase change material can effectively absorb or release heat, thereby maintaining the optimal temperature for energy storage. By optimizing the flow path of the coolant, unnecessary heat loss and energy consumption are reduced, and the efficiency of the entire liquid cooling system is improved.

[0229] In combination with the foregoing content, it can be known that when the energy storage cabinet 20 is in the first working state, or when the energy storage cabinet 20 is in the second working state and the detected temperature is higher than the preset temperature, the first flow channel 310 is not connected to the first heat exchange pipe 110. Therefore, under the control of the controller, the three-way valve 410 can close the third valve port 413 and open the first valve port 411 and the second valve port 412, so that the first flow channel 310 is not connected to the first heat exchange pipe 110.

[0230] When the energy storage cabinet 20 is in the second working state and the detected temperature is lower than the preset temperature, the first flow channel 310 is connected to the first heat exchange pipe 110. Therefore, under the control of the controller, the three-way valve 410 can close the first valve port 411 and open the second valve port 412 and the third valve port 413 to connect the first flow channel 310 to the first heat exchange pipe 110.

[0231] By controlling the opening and closing of different valve ports of the three-way valve 410, the energy storage cabinet 20 can flexibly adjust the flow path of the coolant according to actual needs to ensure temperature management under different working states and environmental conditions. The above method can ensure that the energy storage cabinet 20 can maintain operation under different conditions and prevent overheating or overcooling from affecting the performance of the energy storage cabinet 20.

[0232] Reference Fig.14 and Fig.15 As an optional implementation, the multi-way valve 400 is a four-way valve 420, and the four-way valve 420 has a fourth valve port 421, a fifth valve port 422, a sixth valve port 423 and a seventh valve port 424 that are interconnected.

[0233] The fourth valve port 421 is connected to the input end of the first heat exchange pipe 110, and is used to receive the coolant from the first heat exchange pipe 110. The fifth valve port 422 is connected to the output end of the first heat exchange pipe 110, and is used to return the coolant to the first heat exchange pipe 110. The sixth valve port 423 is connected to the input end of the first flow channel 310, and is used to introduce the coolant into the first flow channel 310. The seventh valve port 424 can provide an additional flow path.

[0234] The four-way valve 420 can provide more complex fluid path control and can be switched under different conditions to optimize thermal management.

[0235] The first circuit unit 100 further includes a first air-to-liquid heat exchanger 180 , a second auxiliary pipeline 150 and a third auxiliary pipeline 160 . The first air-to-liquid heat exchanger 180 is connected to the first heat exchange pipeline 110 , and is used to assist in temperature management of the coolant through air flow.

[0236] The introduction of the first air-to-liquid heat exchanger 180 can provide an additional cooling means. When the detected temperature is low, the heat dissipation demand of the energy storage device 21 is reduced, and the circuit where the first air-to-liquid heat exchanger 180 is located can be used to dissipate heat for the energy storage device 21, so there is no need to start the refrigeration unit 120 including the compressor 121, which is conducive to reducing energy consumption. Therefore, the cooling efficiency and flexibility of the energy storage cabinet 20 can be improved.

[0237] One end of the second auxiliary pipe 150 is connected to the output end of the first flow channel 310, and the other end is connected to the input end of the first heat exchange pipe 110. The second auxiliary pipe 150 can allow the coolant to return directly to the heat exchange pipe after passing through the phase change part 330, which can optimize the heat exchange process and improve the response speed of the energy storage cabinet 20.

[0238] One end of the third auxiliary pipeline 160 is in communication with the seventh valve port 424, and the other end is in communication with the input end of the first heat exchange pipeline 110. The third auxiliary pipeline 160 can provide an additional flow path, allowing the circuit unit to be flexibly adjusted under certain conditions (such as when additional cooling or heat release is required), thereby improving the adaptability of the energy storage cabinet 20.

[0239] It can be understood that when the first circuit unit 100 includes the first pump 170 and the first air-liquid heat exchanger 180, the fourth valve port 421 is connected to the first pump 170 through the first air-liquid heat exchanger 180, and the two ends of the third auxiliary pipeline 160 are respectively connected to the seventh valve port 424 of the four-way valve 420 and the first pump 170.

[0240] It should be noted that the energy consumption between the first air-to-liquid heat exchanger 180 and the refrigeration unit 120 having the compressor 121 is different. The refrigeration unit 120 is more power-consuming, and the first circuit unit 100 introduced with the first air-to-liquid heat exchanger 180 is relatively energy-saving. Therefore, when the first heat exchange pipe 110 is connected to the first air-to-liquid heat exchanger 180 through the four-way valve 420, if the first circuit unit 100 can meet the heat dissipation demand of the energy storage device 21, there is no need to start the compressor 121.

[0241] Through the combination of the four-way valve 420 and multiple auxiliary pipelines, the energy storage cabinet 20 can flexibly adjust the flow path of the coolant under different temperature conditions and working conditions to select different circuits to dissipate heat for the energy storage device 21. The above flexibility can improve the energy consumption of the thermal management device 10.

[0242] The configuration of the four-way valve 420 and the auxiliary pipeline enables the coolant to circulate between different components, ensuring that the phase change material can effectively absorb or release heat, thereby maintaining the temperature balance of the energy storage cabinet 20. By optimizing the flow path of the coolant and introducing the first air-to-liquid heat exchanger 180, unnecessary heat loss and energy consumption can be reduced.

[0243] Reference Fig.15 As an optional implementation, when the energy storage cabinet 20 is in the first working state, or when the energy storage cabinet 20 is in the second working state and the detected temperature is higher than the preset temperature,

[0244] The controller controls the four-way valve 420 to close the fourth valve port 421 and the sixth valve port 423 and open the fifth valve port 422 and the seventh valve port 424; alternatively, the controller may also control the four-way valve 420 to close the seventh valve port 424 and the sixth valve port 423 and open the fifth valve port 422 and the fourth valve port 421.

[0245] When the energy storage cabinet 20 is in the second working state and the detected temperature is lower than the preset temperature,

[0246] The controller controls the four-way valve 420 to close the fifth valve port 422 and the seventh valve port 424 and to open the fourth valve port 421 and the sixth valve port 423; or the controller can also control the four-way valve 420 to close the fourth valve port 421 and the seventh valve port 424 and to open the fifth valve port 422 and the sixth valve port 423;

[0247] In combination with the foregoing content, it can be known that when the energy storage cabinet 20 is in the first working state, or when the energy storage cabinet 20 is in the second working state and the detected temperature is higher than the preset temperature, the first flow channel 310 is not connected to the first heat exchange pipeline 110. Therefore, under the control of the controller, the four-way valve 420 can close the fourth valve port 421 and the sixth valve port 423, and open the fifth valve port 422 and the seventh valve port 424, or close the seventh valve port 424 and the sixth valve port 423 and open the fifth valve port 422 and the fourth valve port 421, so that the first flow channel 310 is not connected to the first heat exchange pipeline 110.

[0248] When the energy storage cabinet 20 is in the second working state and the detected temperature is lower than the preset temperature, the first flow channel 310 is connected to the first heat exchange pipe 110. Therefore, under the control of the controller, the four-way valve 420 can close the fifth valve port 422 and the seventh valve port 424, and open the fourth valve port 421 and the sixth valve port 423. Alternatively, the first flow channel 310 can be connected to the first heat exchange pipe 110 by closing the fourth valve port 421 and the seventh valve port 424 and opening the fifth valve port 422 and the sixth valve port 423.

[0249] By controlling the opening and closing of different valve ports of the four-way valve 420, the energy storage cabinet 20 can flexibly adjust the flow path of the coolant according to actual needs to ensure temperature management under different working conditions and environmental conditions. The above method can ensure that the energy storage cabinet 20 can maintain operation under different conditions and prevent overheating or overcooling from affecting the performance of the energy storage cabinet 20.

[0250] It should be noted that when the first heat exchange pipe 110 flows through the first air-liquid heat exchanger 180, the coolant can directly exchange heat with the external environment through the first air-liquid heat exchanger 180. This direct heat exchange method can avoid unnecessary energy consumption because there is no need to start the refrigeration unit 120 for compression refrigeration.

[0251] By directly utilizing the low-temperature environment for cooling, the energy storage cabinet 20 can reduce energy consumption and improve overall energy efficiency, especially in winter or under low-temperature conditions. In the description of the embodiments of the present application, it should be understood that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be indirectly connected through an intermediate medium, it can be the connection of devices in two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0252] The terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In the description of the present application, "plurality" means two or more, unless otherwise specified.

[0253] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0254] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for the technical features of the device or the entire device therein. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy storage cabinet, characterized in that: It comprises an energy storage device (21), a power conversion device (22) and a heat management device (10), wherein the heat management device (10) comprises a first circuit unit (100), a second circuit unit (200) and a phase change heat storage unit (300); Cooling liquid flows through both the first circuit unit (100) and the second circuit unit (200); The first circuit unit (100) comprises a first heat exchange pipe (110), and the coolant of the first circuit unit (100) is used to exchange heat with the energy storage device (21) of the energy storage cabinet (20); The second circuit unit (200) comprises a second heat exchange pipe (210), the cooling liquid of the second circuit unit (200) is used for heat exchange with the energy storage device (21) of the energy storage cabinet (20), and the first circuit unit (100) and the second circuit unit (200) are independent of each other; The phase-change heat storage unit (300) is connected in series to one of the first heat exchange pipe (110) and the second heat exchange pipe (210), and is connected in parallel to the other of the first heat exchange pipe (110) and the second heat exchange pipe (210).

2. The energy storage cabinet according to claim 1, characterized in that: The first circuit unit (100) further comprises a refrigeration unit (120) and a heater (130), wherein the refrigeration unit (120) is used to cool the coolant flowing through the first heat exchange pipe (110), and the heater (130) is used to heat the coolant flowing through the first heat exchange pipe (110); The phase-change heat storage unit (300) is directly connected to the second heat exchange pipe (210), and the phase-change heat storage unit (300) is selectively connected to the first heat exchange pipe (110).

3. The energy storage cabinet according to claim 2, characterized in that: The thermal management device (10) further comprises a multi-way valve (400); the phase-change heat storage unit (300) comprises a first flow channel (310), a second flow channel (320) and a phase change portion (330); the first flow channel (310) and the second flow channel (320) are arranged at an interval through the phase change portion (330); The first flow channel (310) is selectively connected to the first heat exchange pipe (110) through the multi-way valve (400), and the second flow channel (320) is directly connected to the second heat exchange pipe (210).

4. The energy storage cabinet according to any one of claims 1 to 3, characterized in that: The energy storage cabinet (20) has a first working state and a second working state which can be switched with each other; When the energy storage cabinet (20) is in the first working state, the energy storage device (21), the power conversion device (22) and the thermal management device (10) are all working; the phase change heat storage unit (300) is not in communication with the first heat exchange pipe (110) but is in communication with the second heat exchange pipe (210); When the energy storage cabinet (20) is in the second working state, the energy storage device (21) and the power conversion device (22) are not working, the thermal management device (10) is working, and the phase change heat storage unit (300) and the first heat exchange pipe (110) selectively flow; The energy storage cabinet (20) further comprises a controller, which is used to obtain the working state of the energy storage cabinet (20) and control the communication between the phase change heat storage unit (300) and the first heat exchange pipe (110) according to the working state.

5. The energy storage cabinet according to claim 4, characterized in that: When the thermal management device (10) further includes a multi-way valve (400), and the phase-change thermal storage unit (300) includes a first flow channel (310), a second flow channel (320), and a phase-change portion (330), the phase-change portion (330) has a threshold temperature; The energy storage cabinet (20) further comprises a temperature sensor electrically connected to the controller, wherein the temperature sensor is used to obtain a detection temperature; The controller has a preset temperature lower than the threshold temperature, and is configured to obtain a detection temperature provided by the temperature sensor, and control the connection relationship between the multi-way valve (400) and the first flow channel (310) according to the working state, the detection temperature and the preset temperature, so as to balance the temperature of the first heat exchange pipe (110) and the temperature of the second heat exchange pipe (210).

6. The energy storage cabinet according to claim 5, characterized in that: When the energy storage cabinet (20) is in the first working state and the detected temperature is higher than the preset temperature or the detected temperature is lower than the preset temperature, the controller controls the multi-way valve (400) so that the first heat exchange pipe (110) is disconnected from the first flow channel (310) and the second flow channel (320) is connected to the second heat exchange pipe (210); When the energy storage cabinet (20) is in the second working state and the detected temperature is higher than the preset temperature, the controller controls the multi-way valve (400) so that the first heat exchange pipe (110) is disconnected from the first flow channel (310) and the second flow channel (320) is connected to the second heat exchange pipe (210); When the energy storage cabinet (20) is in the second working state and the detected temperature is lower than the preset temperature, the controller controls the multi-way valve (400) so that the first heat exchange pipe (110) is connected to the first flow channel (310) and the second flow channel (320) is connected to the second heat exchange pipe (210).

7. The energy storage cabinet according to claim 6, characterized in that: The multi-way valve (400) is a three-way valve (410), and the three-way valve (410) has a first valve port (411), a second valve port (412), and a third valve port (413) that are connected to each other, the first valve port (411) being connected to the input end of the first heat exchange pipe (110), the second valve port (412) being connected to the output end of the first heat exchange pipe (110), and the third valve port (413) being connected to the input end of the first flow channel (310). The first circuit unit (100) further comprises a first auxiliary pipe (140) connected to the first heat exchange pipe (110), one end of the first auxiliary pipe (140) being connected to the output end of the first flow channel (310), and the other end of the first auxiliary pipe (140) being connected to the output end of the first heat exchange pipe (110).

8. The energy storage cabinet according to claim 7, characterized in that: When the energy storage cabinet (20) is in the first working state, or when the energy storage cabinet (20) is in the second working state and the detected temperature is higher than the preset temperature, The controller controls the three-way valve (410) to close the third valve port (413), and to open the first valve port (411) and the second valve port (412); When the energy storage cabinet (20) is in the second working state and the detected temperature is lower than the preset temperature, The controller controls the three-way valve (410) to close the first valve port (411) and to open the second valve port (412) and the third valve port (413).

9. The energy storage cabinet according to claim 6, characterized in that: The multi-way valve (400) is a four-way valve (420), and the four-way valve (420) has a fourth valve port (421), a fifth valve port (422), a sixth valve port (423), and a seventh valve port (424) that are connected to each other, the fourth valve port (421) is connected to the input end of the first heat exchange pipe (110), the fifth valve port (422) is connected to the output end of the first heat exchange pipe (110), and the sixth valve port (423) is connected to the input end of the first flow channel (310); The first circuit unit (100) further comprises a first air-liquid heat exchanger (180), a second auxiliary pipeline (150) and a third auxiliary pipeline (160), wherein the first air-liquid heat exchanger (180) is connected to the first heat exchange pipeline (110); One end of the second auxiliary pipeline (150) is connected to the output end of the first flow channel (310), and the other end is connected to the input end of the first heat exchange pipeline (110); One end of the third auxiliary pipeline (160) is in communication with the seventh valve port (424), and the other end is in communication with the input end of the first heat exchange pipeline (110).

10. The energy storage cabinet according to claim 9, characterized in that: When the energy storage cabinet (20) is in the first working state, or when the energy storage cabinet (20) is in the second working state and the detected temperature is higher than the preset temperature, The controller controls the four-way valve (420) to close the fourth valve port (421) and the sixth valve port (423) and to open the fifth valve port (422) and the seventh valve port (424); or, the controller controls the four-way valve (420) to close the seventh valve port (424) and the sixth valve port (423) and to open the fifth valve port (422) and the fourth valve port (421); When the energy storage cabinet (20) is in the second working state and the detected temperature is lower than the preset temperature, The controller controls the four-way valve (420) to close the fifth valve port (422) and the seventh valve port (424) and to open the fourth valve port (421) and the sixth valve port (423); or, the controller controls the four-way valve (420) to close the fourth valve port (421) and the seventh valve port (424) and to open the fifth valve port (422) and the sixth valve port (423).

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