Immersion phase change cooling device and cooling method of net-forming type energy storage converter

Abstract

The invention discloses an immersion phase change cooling device and cooling method for a net-forming type energy storage converter. The device comprises a power module phase change cooling unit, a condensation module, a liquid storage tank and a heat exchanger, the power module heating element is soaked in a refrigerant of the power module phase change cooling unit, the refrigerant absorbs heat and is heated to generate phase change vaporization, and a liquid refrigerant is converted into a gas refrigerant to be used for reducing the temperature of the power module heating element. A gaseous refrigerant flows to a condensation module, the condensation module exchanges heat with the gaseous refrigerant, so that the gaseous refrigerant is converted into a liquid refrigerant through phase change, and the liquid refrigerant flows to a heat exchanger and exchanges heat with air in the cabinet to reduce the temperature of elements in the cabinet; and the liquid refrigerant continues to flow into the power module phase change cooling unit to cool the power module, so that the immersion phase change cooling circulation process of the structure network type energy storage converter is realized. According to the invention, through phase-change heat exchange, the heat dissipation problem of sudden increase of heat consumption caused by short-time multi-time overload of the grid-forming type energy storage converter is solved, and the heat dissipation efficiency and reliability are improved.

Description

Technical Field

[0001] This patent relates to the field of cooling technology for grid-type energy storage converters, and specifically to an immersion phase change cooling device and cooling method for grid-type energy storage converters. Background Art

[0002] Energy storage converters are key devices connecting energy storage battery systems and the power grid. They act as bidirectional translators within the energy storage system, enabling efficient conversion between AC and DC power. Traditional energy storage converters are mostly grid-following, relying on grid voltage and frequency signals for operational control. However, grid-forming energy storage converters are independent of external grid signals and autonomously generate the required voltage and frequency, providing stable power support for the grid.

[0003] As the capacity of grid-connected energy storage converters continues to increase, power modules experience sudden increases in heat consumption under short-term, multiple-fold overload conditions, while other modules experience relatively stable increases in heat consumption. This significant difference in heat consumption distribution places higher demands on the cooling system, requiring a specialized cooling solution tailored to the power module's heat consumption characteristics to effectively address these short-term heat consumption spikes and ensure system reliability and stability. Traditional air cooling technology, limited by its heat dissipation capacity, struggles to effectively address these short-term heat consumption spikes. In contrast, phase-change liquid cooling technology, by leveraging the coolant's ability to absorb large amounts of latent heat during its phase change process, can rapidly dissipate concentrated heat, significantly improving heat dissipation efficiency. Specifically, under overload conditions, the coolant absorbs heat generated by the power module and undergoes a phase change from liquid to gas. This process absorbs a significant amount of heat, thereby keeping the module temperature within a safe range. Compared to air cooling, phase-change liquid cooling significantly improves cooling efficiency, making it particularly suitable for addressing short-term heat consumption spikes in power modules and ensuring stable converter operation.

[0004] The internal component layout of a grid-type energy storage inverter is complex, resulting in different heating conditions in different parts. Furthermore, grid-type energy storage inverters are often used in harsh outdoor environments, where factors such as temperature, humidity, and dust affect heat dissipation. For example, in hot desert regions, air cooling may be ineffective due to excessively high ambient temperatures. Traditional air cooling relies on forced convection from high-power fans, which consumes a lot of energy and generates noise. Furthermore, grid-type energy storage inverters play a critical role in the power grid, and their reliability is crucial to the stable operation of the grid. As grid-type energy storage inverters become smaller and more compact, higher requirements are placed on the size and weight of the cooling system.

[0005] Therefore, from the perspectives of coping with high power density heat generation, ensuring temperature uniformity, adapting to harsh environments, reducing energy consumption and noise, meeting high reliability requirements, and supporting system compact design, phase change liquid cooling systems are very necessary for the research and development of grid-type energy storage inverters.

[0006] Prior art document 1 (CN 115507693 B) discloses a three-dimensional heat dissipation device and method combining phase change, liquid cooling, and air cooling, relating to the field of heat dissipation technology. The method comprises a cooling base provided with a phase change superconducting column, which together with the cooling base forms a phase change heat dissipation portion for dissipating heat from heat-generating components; a cooling chamber provided on the cooling base, through which coolant flows, forming a liquid-cooled heat dissipation portion for dissipating heat conducted by the phase change superconducting column; and air-cooled heat dissipation fins provided on the top of the phase change superconducting column for dissipating heat conducted by the phase change superconducting column. However, the method employs indirect liquid cooling, resulting in relatively low heat exchange efficiency, high heat exchange requirements for components, large space occupation, and a complex structure. Summary of the Invention

[0007] In order to solve the deficiencies in the prior art, the present invention provides a phase change cooling device applied to a grid-type energy storage inverter. By using phase change heat transfer, the heat dissipation problem of the sudden increase in heat consumption caused by short-term multiple overload of the grid-type energy storage inverter is solved, and the problems of low heat dissipation efficiency, complex system, low reliability, etc. in the existing inverter cooling scheme are improved.

[0008] The present invention adopts the following technical solutions.

[0009] The first aspect of the present invention discloses an immersion phase change cooling device for a grid-type energy storage converter, comprising a power module phase change cooling unit, a condensing module, a liquid storage tank, and a heat exchanger;

[0010] The power module heating element is immersed in the refrigerant of the power module phase change cooling unit. The refrigerant absorbs heat in the power module phase change cooling unit, increases in temperature, and undergoes phase change and vaporization, changing from liquid refrigerant to gaseous refrigerant, which is used to reduce the temperature of the power module heating element.

[0011] The gaseous refrigerant flows to the condensing module, which is used to perform heat exchange on the gaseous refrigerant, causing the gaseous refrigerant to undergo a phase change and be converted into liquid refrigerant. The liquid refrigerant flows to the heat exchanger, undergoing indirect contact heat exchange with the air in the cabinet, and is used to reduce the temperature of the components in the cabinet;

[0012] The liquid refrigerant continues to flow into the power module phase change cooling unit to cool the power modules immersed therein, thereby realizing the submerged phase change cooling cycle process of the grid-type energy storage converter.

[0013] Preferably, the condensing module includes a fan and a condenser;

[0014] The condenser is installed below the fan. The fan draws the external low-temperature air into the condensing module from the bottom. After heat exchange in the condenser, the absorbed heat is discharged from the condensing module from the top.

[0015] Preferably, the immersion phase change cooling device further comprises a liquid pump, which is arranged between the liquid storage tank and the heat exchanger and is used to transport the liquid refrigerant in the liquid storage tank to the heat exchanger.

[0016] Preferably, the liquid pump is provided with a flow transmitter for receiving a signal from a control center and adjusting the rotation speed of the water pump to control the flow rate.

[0017] Preferably, the immersion phase change cooling device further comprises a gas connecting pipeline and a liquid connecting pipeline;

[0018] The gas connecting pipeline connects the power module phase change cooling unit and the condensation module, and the liquid connecting pipeline connects the heat exchanger and the power module phase change cooling unit.

[0019] Preferably, the immersion phase change cooling device further comprises a quick-connect connector, which is arranged between the liquid connecting pipelines of the power module phase change cooling unit and is used for liquid refrigerant to enter the power module phase change cooling unit through the liquid connecting pipeline.

[0020] Preferably, an in-cabinet fan is provided on one side of the heat exchanger, and the in-cabinet fan is used for heat dissipation and cooling of other components in the cabinet.

[0021] A second aspect of the present invention discloses an immersion phase change cooling method, based on the immersion phase change cooling device of the grid-type energy storage converter, comprising the following steps:

[0022] The liquid refrigerant absorbs heat in the power module phase change cooling unit, increases in temperature, and undergoes phase change and vaporization, changing from liquid refrigerant to gaseous refrigerant. The gaseous refrigerant flows to the condensing module through the gas connecting pipeline;

[0023] The gaseous refrigerant exchanges heat indirectly with the outside air through the condensing module. As the outside air heats up, the gaseous refrigerant in the pipeline releases heat, cools down, and liquefies into liquid refrigerant.

[0024] Liquid refrigerant flows to the liquid storage tank through the liquid connection pipe. Under the action of the control module, the liquid refrigerant flows to the heat exchanger, where it indirectly exchanges heat with the air in the cabinet. The air in the cabinet releases heat and its temperature decreases, while the liquid refrigerant absorbs heat and its temperature increases.

[0025] The liquid refrigerant flows back into the power module phase change cooling unit along the liquid connecting pipeline to cool the power module, completing the heat absorption and heat release cycle of the grid-type energy storage converter.

[0026] Preferably, when the temperature of the power module has not reached the vaporization temperature of the refrigerant, the refrigerant first enters the sensible heat absorption stage, and absorbs latent heat after reaching the vaporization temperature, entering the latent heat absorption stage.

[0027] Preferably, the control module collects and receives load data of the power module, and adjusts the flow rate of the liquid refrigerant of the control liquid pump into the heat exchanger according to the load data, thereby controlling the flow rate of the liquid refrigerant into the phase change cooling unit of the power module.

[0028] Compared with the prior art, the beneficial effects of the present invention include at least:

[0029] (1) The phase change liquid cooling combination technology in this patent utilizes the property of liquid absorbing a large amount of latent heat during the phase change process. When the grid-type energy storage converter is working, compared with forced air cooling and indirect contact liquid cooling, the coolant absorbs heat and undergoes phase change, from liquid to gas. The cooling efficiency is significantly improved compared with forced air cooling and indirect contact liquid cooling;

[0030] (2) The layout of the internal components of the grid-type energy storage converter is complex, and the heating conditions of different parts are different. This patent optimizes the cold distribution and utilization design. The components with low heat generation are cooled by the cold air that exchanges heat with the low-temperature heat exchanger, and the components with high heat generation are immersed in the coolant. The coolant absorbs a large amount of heat and undergoes phase change to take away the heat, ensuring that each component is maintained at an appropriate temperature and ensuring the smooth operation of the energy storage converter; the phase change liquid cooling system reasonably designs the cold utilization path so that each component can be effectively cooled, ensuring temperature uniformity, avoiding component performance degradation or damage due to local overheating, and extending the overall service life of the equipment;

[0031] (3) The phase change liquid cooling system in this patent is relatively closed and is less affected by the external environment. It can operate stably in high temperature, high cold, high humidity or dusty environments. The water pump energy consumption of the phase change liquid cooling system is lower than that of the fan, and the operating noise is low, which can reduce the impact on the surrounding environment, reduce energy consumption, and improve energy utilization efficiency.

[0032] (4) The phase change liquid cooling system in this patent has high reliability and reduces the risk of heat dissipation failure caused by fan failure compared to air cooling. The phase change heat dissipation process of the coolant in the system is stable and can provide reliable heat dissipation guarantee for the converter for a long time, ensuring its stability under long-term and high-load operation;

[0033] (5) The phase change liquid cooling system in this patent has a compact structure and occupies a small space, which can be easily integrated into the converter, meeting the requirements of compact equipment design, while reducing the overall weight and facilitating installation and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the phase change liquid cooling device of the present invention;

[0035] Figure 2 This is a front view of the phase change liquid cooling device of the present invention;

[0036] Figure 3It is a left side view of the phase change liquid cooling device of the present invention;

[0037] Figure 4 It is a right side view of the phase change liquid cooling device of the present invention;

[0038] Figure 5 This is a flow chart of a method for using the phase change liquid cooling device of the present invention;

[0039] In the figure: 1-power module phase change cooling unit; 2-condensing module; 201-fan; 202-condenser; 3-liquid storage tank; 4-liquid pump; 5-heat exchanger; 6-gas connecting pipeline; 7-liquid connecting pipeline; 8-cabinet circulation fan; 9-quick plug connector; 10-cabinet body. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] In the description of the present disclosure, it should be noted that the terms "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," "outside," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present disclosure and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present disclosure. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0042] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0043] like Figure 1-4As shown, embodiment 1 of the present invention provides a phase change liquid cooling device for a grid-type energy storage converter, including a power module phase change cooling unit 1, a condensing module 2, a liquid storage tank 3, a liquid pump 4, a heat exchanger 5, a gas connecting pipeline 6, a liquid connecting pipeline 7, an in-cabinet circulation fan 8, a quick-connect connector 9 and a cabinet body 10.

[0044] The power module heating element is immersed in the high-temperature refrigerant of the power module phase change cooling unit 1. The high-temperature liquid refrigerant absorbs heat in the power module phase change cooling unit 1, rises in temperature, and undergoes phase change and vaporization, changing from a high-temperature liquid refrigerant to a high-temperature gaseous refrigerant. The high-temperature gaseous refrigerant flows to the condensing module 2 through the gas connecting pipe 6.

[0045] The high-temperature gaseous refrigerant in the condensing module 2 undergoes indirect heat exchange with the low-temperature air outside the cabinet through the condensing module 2. The low-temperature air outside the cabinet is heated to high-temperature air, and the high-temperature gaseous refrigerant in the pipeline releases heat to cool down and liquefy into low-temperature liquid refrigerant.

[0046] The low-temperature liquid refrigerant flows to the liquid storage tank 3 through the gas connecting pipe 6. Under the action of the liquid pump 4, the low-temperature liquid refrigerant flows to the end of the heat exchanger 5, and exchanges heat with the air in the cabinet indirectly. The high-temperature air in the cabinet releases heat to low-temperature air, and the low-temperature liquid refrigerant absorbs heat and becomes high-temperature liquid refrigerant.

[0047] The liquid pump 4 is also provided with a flow transmitter for receiving a signal from the converter control module, thereby adjusting the rotation speed of the liquid pump 4 and thus controlling the flow rate of the liquid refrigerant;

[0048] For the PCS power module, the IGBT is used to collect and receive the load data of the power module in real time, dynamically adjust the flow of liquid pump 4, and control the flow of liquid refrigerant to ensure that the junction temperature of the power module is always maintained within a safe and controllable range, thereby achieving energy consumption optimization and precise temperature control while meeting the heat dissipation requirements.

[0049] The high-temperature liquid refrigerant flows into the power module phase change cooling unit 1 through the liquid connecting pipe 7 and the quick-connect connector 9, cooling the power module immersed therein. The liquid refrigerant absorbs heat and its temperature rises to the boiling point, vaporizing into a high-temperature gaseous refrigerant. The high-temperature gaseous refrigerant then flows into the heat exchanger 5, thus completing a complete heat absorption and heat release cycle.

[0050] It is worth noting that when the high-temperature liquid refrigerant enters the power module phase change cooling unit 1 from the heat exchanger 5, the sensible heat absorption stage occurs first. After the refrigerant reaches the vaporization temperature, it absorbs latent heat and enters the latent heat absorption stage. The liquid refrigerant vaporizes to form a gaseous refrigerant.

[0051] The power module of the grid-type energy storage inverter will experience a sudden increase in heat consumption under short-term multiple overload conditions, while the heat consumption growth of other modules is relatively stable. Therefore, the phase change process of the refrigerant in the power module phase change cooling unit 1 can effectively deal with its short-term heat consumption sudden increase problem and ensure the reliability and stability of the system operation.

[0052] The condensing module 2 consists of a fan 201 and a condenser 202, and is arranged on the top of the cabinet. The fan 201 is an exhaust fan. The fan 201 draws the low-temperature air outside the cabinet into the condensing module 2 from the bottom. After heat exchange in the condenser 202, the heat is absorbed and discharged from the condensing module from the top.

[0053] It is worth noting that the high-temperature gaseous refrigerant flows into the condenser 202 and performs indirect heat exchange with the outside air, transferring heat to the external cold air. The high-temperature gaseous refrigerant releases heat and condenses into low-temperature liquid refrigerant, which flows into the liquid storage tank 3. It is pressurized by the liquid pump 4 and flows into the heat exchanger 5, where it performs indirect heat exchange with the high-temperature air in the cabinet. The low-temperature liquid refrigerant is heated to high-temperature liquid refrigerant, and the air in the cabinet is cooled. Under the action of the fan 8 in the cabinet, the low-temperature air in the cabinet is responsible for the heat dissipation and cooling of other components in the cabinet.

[0054] The amount of coolant in the entire device is surplus compared to the cooling heat required for heat dissipation, and the surplus is stored in the liquid storage tank 3.

[0055] This embodiment relies on the refrigerant's sensible heat to cool low-heat-consumption electronic components within the cabinet, and on the refrigerant's latent heat to cool high-heat-consumption electronic components (power modules). The main types of heat exchange within the cabinet include direct contact heat exchange, indirect contact heat exchange, and forced air cooling. Indirect contact heat exchange occurs at the condensing module 2 and heat exchanger 5, while direct contact heat exchange occurs at the power module phase change cooling unit 1. Cooling air within the cabinet passes through the cabinet fan 8 to force cooling of other heat-generating components.

[0056] The present invention fully utilizes the sensible heat and latent heat of the refrigerant to perform heat exchange and heat dissipation with units with different heat dissipation requirements of the energy storage converter, thereby enhancing the heat dissipation effect.

[0057] like Figure 5 As shown, embodiment 2 of the present invention provides an immersion phase change cooling method for a grid-type energy storage converter, comprising the following steps:

[0058] Step 1: The high-temperature liquid refrigerant absorbs heat in the power module phase change cooling unit 1, increases in temperature, and undergoes phase change and vaporization, transforming from a high-temperature liquid refrigerant to a high-temperature gaseous refrigerant. The high-temperature gaseous refrigerant flows to the condensing module 2 through the gas connecting pipeline;

[0059] In a preferred but non-limiting embodiment of the present invention, when the temperature of the power module has not reached the vaporization temperature of the refrigerant, it first enters the sensible heat absorption stage, and absorbs latent heat after the refrigerant reaches the vaporization temperature, entering the latent heat absorption stage.

[0060] Step 2: The high-temperature gaseous refrigerant undergoes indirect heat exchange with the external low-temperature air through the condensation module 2. The external low-temperature air is heated to high-temperature air, and the high-temperature gaseous refrigerant in the pipeline releases heat to cool down and liquefy into low-temperature liquid refrigerant.

[0061] Step 3: The low-temperature liquid refrigerant flows to the liquid storage tank 3 through the liquid connecting pipe. Under the action of the control module, the low-temperature liquid refrigerant flows to the heat exchanger 5, and indirectly exchanges heat with the air in the cabinet. The high-temperature air in the cabinet releases heat to low-temperature air, and the low-temperature liquid refrigerant absorbs heat to become high-temperature liquid refrigerant.

[0062] In a preferred but non-limiting embodiment of the present invention, the liquid pump 4 is regulated by a flow transmitter. After the control module collects and receives the load data of the power module, the flow of the upper flow transmitter is adjusted according to the load data to control the liquid refrigerant flow of the liquid pump 4.

[0063] In step 4, the high-temperature liquid refrigerant flows back into the power module phase change cooling unit 1 along the liquid connecting pipeline to cool the power module, completing the heat absorption and heat release cycle of the grid-type energy storage converter.

[0064] Compared with the prior art, the beneficial effects of the present invention include at least:

[0065] (1) The phase change liquid cooling combination technology in this patent utilizes the property of liquid absorbing a large amount of latent heat during the phase change process. When the grid-type energy storage converter is working, compared with forced air cooling and indirect contact liquid cooling, the liquid refrigerant absorbs heat and undergoes phase change, changing from liquid to gas. The cooling efficiency is significantly improved compared with forced air cooling and indirect contact liquid cooling.

[0066] (2) The layout of the internal components of the grid-type energy storage converter is complex, and the heating conditions of different parts are different. This patent optimizes the cold distribution and utilization design. The components with low heat generation are cooled by the cold air that exchanges heat with the low-temperature heat exchanger, and the components with high heat generation are immersed in the refrigerant. The liquid refrigerant absorbs a large amount of heat and undergoes phase change to take away the heat, ensuring that each component is maintained at an appropriate temperature and ensuring the smooth operation of the energy storage converter; the phase change liquid cooling system reasonably designs the cold utilization path so that each component can be effectively cooled, ensuring temperature uniformity, avoiding component performance degradation or damage due to local overheating, and extending the overall service life of the equipment;

[0067] (3) The phase change liquid cooling system in this patent is relatively closed and is less affected by the external environment. It can operate stably in high temperature, high cold, high humidity or dusty environments. The water pump energy consumption of the phase change liquid cooling system is lower than that of the fan, and the operating noise is low, which can reduce the impact on the surrounding environment, reduce energy consumption, and improve energy utilization efficiency.

[0068] (4) The phase change liquid cooling system in this patent has high reliability and reduces the risk of heat dissipation failure caused by fan failure compared to air cooling. The phase change heat dissipation process of the refrigerant in the system is stable and can provide reliable heat dissipation guarantee for the converter for a long time, ensuring its stability under long-term and high-load operation;

[0069] (5) The phase change liquid cooling system in this patent has a compact structure and occupies a small space, which can be easily integrated into the converter, meeting the requirements of compact equipment design, while reducing the overall weight and facilitating installation and transportation.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. An immersion phase change cooling device for a grid-type energy storage converter, characterized in that: It comprises a power module phase change cooling unit (1), a condensation module (2), a liquid storage tank (3) and a heat exchanger (5); The power module heating element is immersed in the refrigerant of the power module phase change cooling unit (1). The refrigerant absorbs heat in the power module phase change cooling unit (1), increases in temperature, and undergoes phase change and vaporization, changing from a liquid refrigerant to a gaseous refrigerant, thereby reducing the temperature of the power module heating element. The gaseous refrigerant flows to the condensing module (2), and the condensing module (2) is used to perform heat exchange on the gaseous refrigerant, so that the gaseous refrigerant undergoes a phase change and is converted into a liquid refrigerant. The liquid refrigerant flows to the heat exchanger (5), and performs indirect contact heat exchange with the air in the cabinet, so as to reduce the temperature of the components in the cabinet; The liquid refrigerant continues to flow into the power module phase change cooling unit (1), cooling the power module immersed therein, thereby realizing the submerged phase change cooling cycle process of the grid-type energy storage converter.

2. The immersion phase change cooling device for a grid-type energy storage converter according to claim 1, characterized in that: The condensation module (2) comprises a fan (201) and a condenser (202); The condenser (202) is arranged below the fan (201), and the fan (201) draws external low-temperature air from the bottom into the condensation module (2). After heat exchange in the condenser (202), the absorbed heat is discharged from the condensation module (2) from the top.

3. The immersion phase change cooling device for a grid-type energy storage converter according to claim 1, characterized in that: The immersion phase change cooling device further comprises a liquid pump (4), which is arranged between the liquid storage tank (3) and the heat exchanger (5) and is used to transport the liquid refrigerant in the liquid storage tank (3) to the heat exchanger (5).

4. The immersion phase change cooling device for a grid-type energy storage converter according to claim 3, characterized in that: The liquid pump (4) is provided with a flow transmitter for receiving a signal from a control module and adjusting the rotation speed of the water pump to control the flow.

5. The immersion phase change cooling device for a grid-type energy storage converter according to claim 1, characterized in that: The immersion phase change cooling device further comprises a gas connecting pipeline (6) and a liquid connecting pipeline (7); The gas connection pipeline (6) connects the power module phase change cooling unit (1) and the condensation module (2), and the liquid connection pipeline (7) connects the heat exchanger (5) and the power module phase change cooling unit (1).

6. The immersion phase change cooling device for a grid-type energy storage converter according to claim 5, characterized in that: The immersion phase change cooling device further comprises a quick-connect connector (9), which is arranged between the liquid connecting pipeline (7) of the power module phase change cooling unit (1) and is used for liquid refrigerant to enter the power module phase change cooling unit (1) through the liquid connecting pipeline (7).

7. The immersion phase change cooling device for a grid-type energy storage converter according to claim 1, characterized in that: An in-cabinet fan (8) is provided on one side of the heat exchanger (5), and the in-cabinet fan (8) is used for heat dissipation and cooling of other components in the cabinet.

8. An immersion phase change cooling method, based on an immersion phase change cooling device for a grid-type energy storage converter according to any one of claims 1 to 7, characterized in that: The following steps are involved: The liquid refrigerant absorbs heat in the power module phase change cooling unit (1), increases in temperature, and undergoes phase change and vaporization, changing from liquid refrigerant to gaseous refrigerant. The gaseous refrigerant flows to the condensation module (2) through the gas connection pipeline; The gaseous refrigerant exchanges heat indirectly with the outside air through the condensation module (2), the outside air heats up, and the gaseous refrigerant in the pipeline releases heat, cools down, and liquefies into liquid refrigerant; The liquid refrigerant flows to the liquid storage tank (3) through the liquid connecting pipe. Under the action of the control module, the liquid refrigerant flows to the heat exchanger (5) and exchanges heat indirectly with the air in the cabinet. The air in the cabinet releases heat and its temperature decreases, while the liquid refrigerant absorbs heat and its temperature increases. The liquid refrigerant flows back into the power module phase change cooling unit (1) along the liquid connecting pipeline to cool the power module, thereby completing the heat absorption and heat release cycle of the grid-type energy storage converter.

9. The immersion phase change cooling method according to claim 8, characterized in that: When the temperature of the power module does not reach the vaporization temperature of the refrigerant, the refrigerant first enters the sensible heat absorption stage, and absorbs latent heat after reaching the vaporization temperature, entering the latent heat absorption stage.

10. The immersion phase change cooling method according to claim 8, characterized in that: The control module collects and receives load data of the power module, and adjusts the flow rate of the liquid refrigerant of the control liquid pump (4) into the heat exchanger (5) according to the load data, thereby controlling the flow rate of the liquid refrigerant into the power module phase change cooling unit (1).

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