Immersion liquid cooling device and energy storage system

Abstract

An immersion liquid cooling device (1000) and an energy storage system. The immersion liquid cooling device (1000) in the energy storage system comprises a rack (100), flow guide assemblies, a circular driving mechanism (300) and a refrigeration mechanism (200), wherein the rack (100) is provided with a cavity configured to accommodate an immersion liquid; battery modules (2000) are mounted in the cavity; the flow guide assemblies are provided with flow guide ports (112); each flow guide port (112) is opposite a gap between two adjacent batteries (2100) in each battery module (2000); the circular driving mechanism (300) is in communication with the flow guide assemblies; the circular driving mechanism (300) is configured to drive the immersion liquid to sequentially flow through the flow guide assemblies and then flow into the gap between the two adjacent batteries (2100); and the refrigeration mechanism (200) is configured to cool the immersion liquid.

Description

Immersion liquid cooling device and energy storage system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on April 24, 2024, with application number 202420867963.0. The entire contents of the above application are incorporated by reference into this application.

[0002] Technical Field

[0003] The present application relates to the field of energy storage technology, for example, to an immersion liquid cooling device and an energy storage system.

[0004] Background Art

[0005] Energy storage systems typically consist of a cabinet and multiple battery modules stored within it, connected in series and / or in parallel. With the continuous development of new energy technologies, energy storage technology is also becoming increasingly mature. As energy storage technology evolves towards larger capacity and higher energy density, the integration of battery modules within the cabinet is becoming increasingly high. This, in turn, places higher demands on heat dissipation within the cabinet to ensure safe use of the battery modules.

[0006] In the related art, there are two main heat dissipation methods for the battery modules in the cabinet of the energy storage system, namely air cooling or liquid cooling plate cooling.

[0007] Technical issues

[0008] Whether using air cooling or liquid cooling plates, the heat dissipation effect on battery modules is not ideal. This is especially true for heat dissipation between two adjacent cells in a battery module. Neither the air from the air cooling system nor the liquid cooling plate can reach the gap between the two adjacent cells in the battery module to dissipate heat, posing a significant safety hazard.

[0009] Technical Solutions

[0010] The present application provides an immersion liquid cooling heat dissipation device and an energy storage system to achieve immersion liquid cooling heat dissipation at each position of the battery module in the cabinet, thereby improving the heat dissipation effect and heat dissipation efficiency of the battery module.

[0011] Immersion liquid cooling device, including:

[0012] The cabinet has a cavity configured to accommodate immersion liquid, in which a battery module is installed; a diversion assembly is provided with a diversion port, which is opposite to the gap between two adjacent batteries in the battery module; a circulation drive mechanism, which is connected to the diversion assembly and is configured to drive the immersion liquid to flow through the diversion assembly in sequence and then flow into the gap between two adjacent batteries; and a refrigeration mechanism is configured to cool the immersion liquid.

[0013] The energy storage system includes a monitoring device, multiple battery modules, and an immersion liquid cooling device. The monitoring device is fixed outside the cabinet. The wiring harness in the monitoring device passes through the wall panel of the cabinet and extends into the immersion liquid and is connected to the multiple battery modules. The monitoring device is configured to monitor the voltage and current of the battery modules.

[0014] Beneficial effects

[0015] Beneficial effects of this application:

[0016] The immersion liquid cooling device provided in the present application accommodates a battery module and immersion liquid in the cavity of a cabinet, and aligns the guide port of the guide assembly with the gap between two adjacent batteries in the battery module. On the basis of cooling the immersion liquid by a refrigeration mechanism, a circulation drive mechanism is used to drive the immersion liquid to flow through the guide assembly and then into the gap between two adjacent batteries, thereby realizing heat exchange among the refrigeration mechanism, the immersion liquid and the battery module, thereby achieving effective heat dissipation of the gap between two adjacent batteries in the battery module, thereby ensuring sufficient heat dissipation at each position in the battery module, having a good heat dissipation effect and high heat dissipation efficiency, and improving the safety of the battery module.

[0017] The present application also provides an energy storage system, which improves the heat dissipation effect of the gap between two adjacent batteries in the battery module by applying an immersion liquid cooling device, thereby ensuring sufficient heat dissipation at each position in the battery module, with good heat dissipation effect and high heat dissipation efficiency, thereby improving the safety of battery module use.

[0018] BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic structural diagram of an immersion liquid cooling device and a battery module provided in an embodiment of the present application;

[0020] FIG2 is a schematic structural diagram of an immersion liquid cooling device provided in an embodiment of the present application;

[0021] FIG3 is a schematic structural diagram of a tray and a battery module provided in an embodiment of the present application;

[0022] FIG4 is a partial enlarged schematic diagram of point A in FIG3 ;

[0023] FIG5 is a top view of a tray provided in an embodiment of the present application.

[0024] In the picture:

[0025] 1000, immersion liquid cooling device;

[0026] 100, cabinet; 110, tray; 111, cavity; 112, diversion port; 120, liquid injection hole; 130, liquid level detection element; 140, explosion relief valve; 150, ventilation hole;

[0027] 200, refrigeration mechanism; 210, refrigeration components; 220, refrigeration cycle pipe;

[0028] 300, circulation drive mechanism; 310, circulation drive member; 320, diversion pipe; 321, diversion branch pipe; 330, heat exchanger; 331, accommodating chamber;

[0029] 2000, battery module; 2100, battery.

[0030] Modes for Carrying Out the Invention

[0031] The technical solution of this application is explained below with reference to the accompanying drawings and through specific implementation methods.

[0032] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. A person of ordinary skill in the art will be able to understand the meaning of these terms in this application based on the circumstances.

[0033] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may indicate that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may indicate that the first feature is at a lower level than the second feature.

[0034] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not have any special meanings.

[0035] Example 1

[0036] Energy storage systems are typically composed of a cabinet and multiple battery modules stored within the cabinet, with the multiple battery modules connected in series and / or in parallel. In related technologies, there are two main heat dissipation methods for the battery modules within the cabinets of energy storage systems: air cooling or liquid cooling. Both air cooling and liquid cooling have unsatisfactory heat dissipation effects on the battery modules. In particular, for heat dissipation between two adjacent batteries in a battery module, the cold air and liquid cooling plates of air cooling cannot reach the gaps between two adjacent batteries in the battery module for heat dissipation, posing a significant safety hazard.

[0037] As shown in Figures 1 to 5, this embodiment provides an immersion liquid cooling device 1000. The immersion liquid cooling device 1000 includes a cabinet 100, a refrigeration mechanism 200, a circulation drive mechanism 300, and a flow guide assembly. The cabinet 100 has a cavity configured to accommodate immersion liquid, in which a battery module 2000 is installed. The flow guide assembly has a flow guide port 112, which is opposite to the gap between two adjacent batteries 2100 in the battery module 2000. The circulation drive mechanism 300 is in communication with the flow guide assembly and is configured to drive the immersion liquid to flow through the flow guide assembly and then into the gap between two adjacent batteries 2100. The refrigeration mechanism 200 is configured to cool the immersion liquid.

[0038] The immersion liquid cooling device 1000 accommodates the battery module 2000 and the immersion liquid in the cavity of the cabinet 100, and aligns the guide port 112 of the guide component with the gap between two adjacent batteries 2100 in the battery module 2000. On the basis of the immersion liquid being cooled by the refrigeration mechanism 200, the circulation drive mechanism 300 is used to drive the immersion liquid to flow through the guide component and then into the gap between two adjacent batteries 2100, thereby realizing heat exchange among the refrigeration mechanism 200, the immersion liquid and the battery module 2000, and thus achieving effective heat dissipation of the gap between two connected batteries 2100 in the battery module 2000, thereby ensuring sufficient heat dissipation of each position in the battery module 2000, having good heat dissipation effect and high heat dissipation efficiency, and improving the safety of the battery module 2000.

[0039] The diversion assembly includes a tray 110 configured to support the battery modules 2000. The tray 110 has a cavity 111 that communicates with a diversion port 112. When the circulation drive mechanism 300 drives the immersion liquid to circulate, the immersion liquid first flows into the cavity 111 within the tray 110. After the immersion liquid fills the cavity 111, the immersion liquid in the cavity 111 is discharged along the diversion port 112 and flows into the gap between two adjacent batteries 2100.

[0040] In one embodiment, the battery module 2000 includes a plurality of batteries 2100, with a gap provided between each two adjacent batteries 2100. The tray 110 has a plurality of diverter ports 112 disposed along the arrangement direction of the batteries 2100, with each diverter port 112 corresponding to a gap between two adjacent batteries 2100. By providing a plurality of diverter ports 112 on the tray 110 along the arrangement direction of the batteries 2100, each diverter port 112 communicating with the cavity 111 and ensuring that each diverter port 112 corresponds to a gap between two adjacent batteries 2100, heat can be dissipated from the gap between any two adjacent batteries 2100 in the battery module 2000, thereby improving the overall heat dissipation effect of the battery module 2000.

[0041] In addition, multiple trays 110 are spaced apart within the cabinet 100. Each tray 110 is provided with a cavity 111 and a diversion port 112 communicating with the cavity 111. Each tray 110 supports at least one group of battery modules 2000. Each diversion port 112 corresponds to the gap between two adjacent batteries 2100 within the battery module 2000. The diversion duct 320 is provided with multiple diversion branch pipes 321. The diversion branch pipes 321 are arranged one-to-one with each tray 110, and each diversion branch pipe 321 is communicated with the cavity 111 within a tray 110. By providing multiple trays 110 within the cabinet 100, each tray 110 supports at least one group of battery modules 2000, and providing multiple diversion branch pipes 321 on the diversion duct 320, each diversion branch pipe 321 corresponding to a tray 110, multiple battery modules 2000 can be cooled and dissipated simultaneously, achieving a good integration effect.

[0042] As shown in Figures 1, 2, 3, and 5, in this embodiment, eight trays 110 are arranged in the cabinet 100 at intervals along the vertical direction. Each tray 110 supports a group of battery modules 2000. Each battery module 2000 includes 19 stacked batteries 2100. Therefore, each tray 110 is provided with 18 diversion ports 112 that are in communication with the cavity 111. Each diversion port 112 corresponds to a gap between two adjacent batteries 2100. In other embodiments, the number of trays 110, the arrangement of the trays 110, the number of battery modules 2000 supported by each tray 110, and the number of diversion ports 112 in each tray 110 can be adjusted according to actual needs, and this embodiment does not limit this.

[0043] The circulation drive mechanism 300 includes a circulation drive member 310 and a flow guide duct 320. The input end of the flow guide duct 320 is in communication with the circulation drive member 310, and the output end of the flow guide duct 320 is in communication with the cavity 111 within the tray 110. The circulation drive member 310 is configured to drive the immersion liquid to flow sequentially through the flow guide duct 320 and the flow guide assembly, and then into the gap between two adjacent batteries 2100. By providing the flow guide duct 320, which is in communication with the circulation drive member 310 and the cavity 111 within the tray 110, respectively, the circulation drive effect of the circulation drive member 310 on the immersion liquid can be ensured, the efficiency of the immersion liquid flowing into the gap between two adjacent batteries 2100 can be improved, and the heat dissipation effect of the immersion liquid in the gap between two adjacent batteries 2100 can be ensured.

[0044] As an alternative, as shown in Figures 1 and 2, the circulation drive mechanism 300 further includes a heat exchanger 330, which can be a direct cooling heat exchanger, an evaporator, or a liquid-liquid heat exchanger. The heat exchanger 330 includes a housing 331, the input end of which is connected to the output end of the circulation drive member 310, and the output end of which is connected to the flow guide pipe 320. The output end of the refrigeration mechanism 200 is at least partially accommodated in the housing 331. By at least partially accommodating the output end of the refrigeration mechanism 200 in the accommodating cavity 331, connecting the input end of the heat exchanger 330 with the output end of the circulation drive 310, and connecting the output end of the heat exchanger 330 with the input end of the guide pipe 320, before the circulation drive 310 drives the immersion liquid to flow into the guide pipe 320, the immersion liquid first enters the accommodating cavity 331 of the heat exchanger 330, and fully contacts and transfers heat with the output end of the refrigeration mechanism 200 in the accommodating cavity 331, thereby ensuring that the immersion liquid entering the guide pipe 320 is fully cooled, thereby improving the heat dissipation effect of the subsequent immersion liquid on the gap between two adjacent batteries 2100.

[0045] In this embodiment, the circulation driving member 310 is a circulation pump, which drives the circulation of the immersion liquid. The circulation pump has a simple structure, is easy to assemble and disassemble, and has a good driving effect.

[0046] To achieve the circulating drive effect of the circulation pump, related technologies typically require the installation of a return line connected to the circulation pump to ensure the circulation of the immersion liquid. However, due to the driving requirements of the return line, the circulation pump will operate at a high power, resulting in large pressure fluctuations within the cabinet 100. Pressure fluctuations can damage the cabinet 100 and rupture the explosion relief valve 140 on the cabinet 100, increasing maintenance costs. The additional installation of a pressure regulating device configured to balance pressure fluctuations will also increase production costs.

[0047] In this embodiment, in order to improve the protection of the cabinet 100 and save production costs and maintenance costs, the circulation drive member 310, the guide pipe 320, and the heat exchanger 330 are all immersed in the immersion liquid. By immersing the circulation drive member 310, the guide pipe 320, and the heat exchanger 330 in the immersion liquid, there is no need to set up an additional return pipe. The circulation drive member 310 immersed in the immersion liquid can directly drive the immersion liquid in the cabinet 100 to circulate along the heat exchanger 330, the guide pipe 320, the cavity 111, and the guide port 112, thereby reducing the driving power of the circulation drive member 310, reducing pressure fluctuations, improving the protection of the cabinet 100, saving maintenance costs, and eliminating the need for an additional pressure regulating device, thereby saving production costs.

[0048] As one solution, as shown in Figures 1 and 2, the refrigeration mechanism 200 includes a refrigeration element 210 and a refrigeration circulation pipe 220. The refrigeration element 210 is disposed outside the cabinet 100. The input end of the refrigeration circulation pipe 220 is connected to the output end of the refrigeration element 210, and the output end of the refrigeration circulation pipe 220 is connected to the input end of the refrigeration element 210. The refrigeration circulation pipe 220 is partially accommodated in the accommodation chamber 331 of the heat exchanger 330, and the refrigerant circulates between the refrigeration circulation pipe 220 and the refrigeration element 210. By partially accommodating the refrigeration circulation pipe 220 in the accommodation chamber 331 of the heat exchanger 330, connecting the input end of the refrigeration circulation pipe 220 to the output end of the refrigeration element 210, and connecting the output end of the refrigeration circulation pipe 220 to the input end of the refrigeration element 210, the circulation of the refrigerant between the refrigeration circulation pipe 220 and the refrigeration element 210 and heat transfer between the immersion liquid and the refrigeration circulation pipe 220 are achieved.

[0049] The refrigeration element 210 inputs the cooled refrigerant into the refrigeration circulation pipe 220 along the input end of the refrigeration circulation pipe 220. The refrigerant flows in the refrigeration circulation pipe 220 and generates heat transfer with the immersion liquid through the refrigeration circulation pipe 220. The cooled refrigerant absorbs the heat of the immersion liquid. Then, the heated refrigerant flows back to the refrigeration element 210 along the output end of the refrigeration circulation pipe 220. The refrigeration element 210 cools the heated coolant again, thereby realizing the cooling and heat dissipation of the immersion liquid by the refrigerant.

[0050] In this embodiment, the refrigeration element 210 is a direct cooling element, and the refrigerant can be a fluorinated liquid. The direct cooling element inputs the liquid fluorinated liquid or the gas-liquid mixed fluorinated liquid into the refrigeration circulation pipe 220 along the input end of the refrigeration circulation pipe 220. The liquid fluorinated liquid or the gas-liquid mixed fluorinated liquid flows in the refrigeration circulation pipe 220 and generates heat transfer with the immersion liquid through the refrigeration circulation pipe 220. The liquid fluorinated liquid absorbs the heat of the immersion liquid and gradually vaporizes. Subsequently, the gaseous fluorinated liquid or the gas-liquid mixed fluorinated liquid flows back to the direct cooling element along the output end of the refrigeration circulation pipe 220. The direct cooling element again cools the gaseous fluorinated liquid or the gas-liquid mixed fluorinated liquid, thereby achieving cooling and heat dissipation of the immersion liquid by the fluorinated liquid.

[0051] Or in other embodiments, an additional air cooling unit may be provided outside the cabinet 100. On the basis of cooling the refrigerant by the refrigeration component 210, the air cooling unit may be used to cool the refrigeration circulation pipe 220 located outside the cabinet 100 to improve the cooling effect of the immersion liquid.

[0052] To improve the heat exchange efficiency between the coolant and the immersion liquid, fins are provided on the outer surface of the portion of refrigeration cycle pipe 220 submerged in the immersion liquid. The provision of fins on the outer surface of the portion of refrigeration cycle pipe 220 submerged in the immersion liquid increases the contact area between refrigeration cycle pipe 220 and the immersion liquid, thereby improving the heat exchange efficiency between the refrigerant and the immersion liquid within refrigeration cycle pipe 220.

[0053] In addition, in this embodiment, an additional heating device may be provided in the heat exchanger 330 to achieve heating of the battery module 2000, which is not limited in this embodiment. When the battery module 2000 needs to be heated, the heating device and the circulation drive 310 in the heat exchanger 330 are activated. The circulation drive 310 continues to drive the immersion liquid to flow through the accommodating cavity 331, the diversion pipe 320, the cavity 111, and the diversion port 112 in sequence, and then flow into the gap between two adjacent batteries 2100. The heating device heats the immersion liquid in the accommodating cavity 331, so that the immersion liquid flowing into the gap between the two adjacent batteries 2100 heats the gap between the two adjacent batteries 2100, thereby achieving heating of the entire battery module 2000.

[0054] As shown in Figures 1 and 2, the input end of the refrigeration cycle pipe 220 extends from the immersion liquid, passes through the wall of the cabinet 100, and is connected to the output end of the refrigeration unit 210. The output end of the refrigeration cycle pipe 220 extends from the immersion liquid, passes through the wall of the cabinet 100, and is connected to the input end of the refrigeration unit 210. By extending both the input and output ends of the refrigeration cycle pipe 220 from the immersion liquid, passing through the wall of the cabinet 100, and being connected to the refrigeration unit 210, the through-gap between the cabinet 100 and the refrigeration cycle pipe 220 is positioned above the level of the immersion liquid. This ensures the normal operation of the refrigeration mechanism 200 while preventing leakage of immersion liquid along the through-gap between the refrigeration cycle pipe 220 and the cabinet 100, thereby improving protection of the immersion liquid within the cabinet 100.

[0055] In this embodiment, the input end of the refrigeration cycle pipe 220 passes through the upper end wall of the cabinet 100 and is connected to the output end of the refrigeration unit 210. The output end of the refrigeration cycle pipe 220 passes through the upper end wall of the cabinet 100 and is connected to the input end of the refrigeration unit 210. In other embodiments, both the input and output ends of the refrigeration cycle pipe 220 may pass through the lower end wall of the cabinet 100 and be connected to the refrigeration unit 210. This only requires ensuring a sealing effect at the location where the cabinet 100 is penetrated to prevent immersion liquid from leaking along the location where the cabinet 100 is penetrated. This is not a limitation in this embodiment.

[0056] As one solution, as shown in Figures 1 and 2, a liquid injection hole 120 and a liquid level detector 130 are further provided at the upper end of the cabinet 100. Immersion liquid is injected into the cavity of the cabinet 100 through the liquid injection hole 120, and the liquid level detector 130 is configured to detect the liquid level of the immersion liquid in the cavity of the cabinet 100. By providing the liquid injection hole 120 at the upper end of the mechanism, the immersion liquid in the cabinet 100 can be injected while preventing leakage of the immersion liquid through the liquid injection hole 120. By providing the liquid level detector 130 to detect the liquid level of the immersion liquid in the cavity of the cabinet 100, accurate liquid injection into the cavity of the cabinet 100 can be ensured, thereby ensuring the normal operation of the immersion liquid cooling device 1000.

[0057] The immersion liquid cooling device 1000 also includes a controller, wherein the controller is connected to the liquid level detection component 130, the refrigeration component 210 in the refrigeration mechanism 200, and the circulation drive component 310 in the circulation drive mechanism 300. The controller can control the start and stop of the refrigeration component 210 in the refrigeration mechanism 200 and the circulation drive component 310 in the circulation drive mechanism 300 according to the detection information of the liquid level detection component 130.

[0058] By setting a liquid filling hole 120, a liquid level detection component 130 and a controller at the upper end of the cabinet 100, when the liquid level detection component 130 detects that the liquid level height in the cabinet 100 is within the preset height range, the liquid level detection component 130 transmits the detection information to the controller, and the controller controls the refrigeration component 210 and the circulation drive component 310 to start according to the detection information to achieve heat dissipation of the battery module 2000. When the liquid level detection component 130 detects that the liquid level of the immersion liquid in the cabinet 100 is lower than the lowest value of the preset height, or higher than the highest value of the preset height, the liquid level detection component 130 transmits the detection information to the controller, and the controller controls the refrigeration component 210 and the circulation drive component 310 to shut down according to the detection information to ensure that the refrigeration mechanism 200 and the circulation drive mechanism 300 operate under normal working conditions, thereby improving the protection of the refrigeration mechanism 200 and the circulation drive mechanism 300.

[0059] In this embodiment, the liquid level detection element 130 is a laser sensor, which has a compact structure, is easy to install, and has high detection accuracy. In other embodiments, the liquid level detection element 130 can also be an ultrasonic sensor or other types of sensors, which is not limited in this embodiment.

[0060] To enhance protection for the cabinet 100 and the battery modules 2000, a ventilation hole 150 is provided at the top of the cabinet 100. The ventilation hole 150 is connected to a ventilation device and is configured to allow gas within the cavity to be discharged through the ventilation hole 150 and / or allow protective gas to enter the cavity through the ventilation hole 150. By providing the ventilation hole on the top of the cabinet 100, the original gas within the cabinet 100 cavity is replaced with protective gas, thereby preventing the original gas within the cabinet 100 from reacting with the immersion liquid, the cabinet 100, or the battery modules 2000.

[0061] During the immersion liquid filling process, the immersion liquid is first injected into the cabinet 100 until the liquid level is within a preset height range. Then, the immersion liquid filling is stopped and the ventilation device is activated. The ventilation device extracts the air from the cabinet 100 and fills the cabinet 100 with protective gas, completing the immersion liquid filling process. In this embodiment, the protective gas is nitrogen, which has stable chemical properties, is widely available, and is inexpensive. In other embodiments, the protective gas may also be other types of protective gases, which are not limited in this embodiment.

[0062] In addition, after the immersion liquid is injected into the cabinet 100, the circulation drive 310 can be started to drive the immersion liquid to circulate in the cabinet 100 to discharge the air in the guide pipe 320, the heat exchanger 330 and the cavity 111. At this time, the liquid level of the immersion liquid will drop, and then the immersion liquid is replenished into the cabinet 100 along the injection hole 120 to make the liquid level of the immersion liquid return to the preset height.

[0063] To facilitate understanding of the immersion liquid cooling device 1000 provided in this embodiment, the assembly steps of the immersion liquid cooling device 1000 are now described with reference to FIG. 1 to FIG. 5 ;

[0064] 1) Assemble the refrigeration mechanism 200 and the circulation drive mechanism 300 with the cabinet 100.

[0065] 2) The battery module 2000 is supported on the tray 110 of the cabinet 100 , and the gap between two adjacent batteries 2100 in the battery module 2000 is aligned with a guide port 112 on the tray 110 .

[0066] 3) Calculate the expansion limit based on the thermal expansion characteristics of the immersion fluid and the usage scenario. Combined with the structural strength of the cabinet 100 and the limit of the pressure relief device, reserve an inflation space inside the cabinet 100. Determine the preset liquid level range of the cabinet 100 based on the immersion fluid loss due to expansion and long-term use.

[0067] 4) Inject immersion liquid into the cabinet 100 along the liquid injection hole 120 until the immersion liquid reaches a preset height range.

[0068] 5) Start the circulation drive 310 to circulate the immersion liquid in the cabinet 100 and exhaust the air in the guide pipe 320 , the heat exchanger 330 and the cavity 111 .

[0069] 6) Turn off the circulation drive 310 and re-inject the immersion liquid into the cabinet 100 along the injection hole 120 until the height of the immersion liquid reaches the preset height range again.

[0070] 7) Connect the ventilation device to the ventilation port 150 to replace the air in the cabinet 100 with protective gas.

[0071] 8) Seal the liquid injection hole 120 and the ventilation hole 150 to complete the sealing inside the cabinet 100.

[0072] 9) Turn on the controller, which controls the subsequent cycle drive element 310 and the refrigeration element 210 to turn on and off.

[0073] This embodiment also provides an energy storage system. The energy storage system includes a monitoring device, a battery module 2000, and an immersion liquid cooling device 1000. The monitoring device is fixed to the outside of the cabinet 100. The wiring harness within the monitoring device passes through the wall of the cabinet 100 and then extends into the immersion liquid and connects to multiple battery modules 2000. The monitoring device is configured to monitor the voltage and current of the battery modules 2000. By utilizing the immersion liquid cooling device 1000, the energy storage system improves the heat dissipation effect between two adjacent batteries 2100 in the battery module 2000, thereby ensuring sufficient heat dissipation at every location within the battery module 2000. This provides good heat dissipation effect and high heat dissipation efficiency, thereby improving the safety of the battery module 2000.

[0074] In this embodiment, the monitoring device is a battery management system (BMS). The BMS wiring harness passes through the upper wall of the cabinet 100 and then extends into the immersion liquid, connecting to multiple battery modules 2000. The structure and operating principles of the BMS are related art and will not be further described here.

[0075] Example 2

[0076] This embodiment provides an immersion liquid cooling device 1000. The structure of the immersion liquid cooling device 1000 provided in this embodiment is basically the same as that of the first embodiment. The difference between the immersion liquid cooling device 1000 provided in this embodiment and the first embodiment is that the type of the refrigeration element 210 is different.

[0077] In this embodiment, the refrigeration element 210 is a liquid-liquid cooling element, and the refrigerant is a liquid cooling medium. The liquid-liquid cooling element inputs the cooled liquid cooling medium into the refrigeration circulation pipe 220 along the input end of the refrigeration circulation pipe 220. The liquid cooling medium flows in the refrigeration circulation pipe 220 and generates heat transfer with the immersion liquid through the refrigeration circulation pipe 220. The liquid cooling medium absorbs the heat of the immersion liquid. Then, the liquid cooling medium flows back to the liquid-liquid cooling element along the output end of the refrigeration circulation pipe 220. The liquid-liquid cooling element cools the liquid cooling medium again, thereby realizing the cooling and heat dissipation of the immersion liquid by the liquid cooling medium.

[0078] In this embodiment, the refrigeration element 210 may be a cooling tower and a circulation pump, and the refrigerant may be water. The circulation pump drives the water to circulate between the refrigeration circulation pipe 220 and the cooling tower. In other embodiments, the refrigeration element 210 may be other refrigeration devices, and the coolant may be other liquid cooling media, which are not limited in this embodiment.

Claims

1. Immersion liquid cooling device, including: A cabinet (100), the cabinet (100) having a cavity configured to contain an immersion liquid, a battery module (2000) being installed in the cavity; A flow guide component is provided with a flow guide port (112), wherein the flow guide port (112) is opposite to a gap between two adjacent batteries (2100) in the battery module (2000); a circulation drive mechanism (300), the circulation drive mechanism (300) being in conduction with the flow guide component, the circulation drive mechanism (300) being configured to drive the immersion liquid to flow through the flow guide component in sequence and then flow into the gap between two adjacent batteries (2100); The refrigeration mechanism (200) is configured to cool the immersion liquid.

2. The immersion liquid cooling device according to claim 1, wherein: The flow guide assembly comprises a tray (110) configured to support a battery module (2000); the tray (110) has a cavity (111); the cavity (111) is in communication with the flow guide port (112).

3. The immersion liquid cooling device according to claim 1 or 2, wherein: The circulation driving mechanism (300) comprises: a circulating drive member (310); and A flow guide pipe (320), wherein an input end of the flow guide pipe (320) is in communication with the circulation drive member (310), and an output end of the flow guide pipe (320) is in communication with the flow guide assembly, and the circulation drive member (310) is configured to drive the immersion liquid to flow through the flow guide pipe (320) and the flow guide assembly in sequence and then flow into the gap between two adjacent batteries (2100).

4. The immersion liquid cooling device according to claim 3, wherein: The circulation drive mechanism (300) further comprises: A heat exchanger (330), wherein a housing chamber (331) is provided in the heat exchanger (330), an input end of the housing chamber (331) is communicated with an output end of the circulation drive member (310), an output end of the housing chamber (331) is communicated with the guide pipe (320), and the output end of the refrigeration mechanism (200) is at least partially accommodated in the housing chamber (331).

5. The immersion liquid cooling device according to claim 4, wherein: The circulation drive component (310), the flow guide pipe (320), and the heat exchanger (330) are all immersed in the immersion liquid.

6. The immersion liquid cooling device according to any one of claims 1 to 5, wherein: The refrigeration mechanism (200) comprises: A refrigeration component (210) is arranged outside the cabinet (100); and A refrigeration circulation pipe (220), wherein the refrigeration circulation pipe (220) is partially immersed in the immersion liquid, the input end of the refrigeration circulation pipe (220) extends from the immersion liquid and passes through the wall of the cabinet (100) and is connected to the output end of the refrigeration component (210), and the output end of the refrigeration circulation pipe (220) extends from the immersion liquid and passes through the wall of the cabinet (100) and is connected to the input end of the refrigeration component (210), and the refrigerant circulates between the refrigeration circulation pipe (220) and the refrigeration component (210).

7. The immersion liquid cooling device according to claim 6, wherein: Fins are provided on the outer surface of the portion of the refrigeration cycle pipe (220) immersed in the immersion liquid.

8. The immersion liquid cooling device according to any one of claims 1 to 7, wherein: The upper end of the cabinet (100) is also provided with a liquid injection hole (120) and a liquid level detection component (130); the immersion liquid is injected into the cavity of the cabinet (100) along the liquid injection hole (120); and the liquid level detection component (130) is configured to detect the liquid level of the immersion liquid in the cavity of the cabinet (100).

9. The immersion liquid cooling device according to any one of claims 1 to 8, wherein: A ventilation hole (150) is provided at the upper end of the cabinet (100), the ventilation hole (150) being able to communicate with a ventilation device, and the ventilation hole (150) being configured to perform at least one of the following: allowing the gas in the cavity to be discharged along the ventilation hole (150); allowing the protective gas to enter the cavity along the ventilation hole (150).

10. An energy storage system, comprising a monitoring device, a battery module (2000), and an immersion liquid cooling device according to any one of claims 1 to 9, wherein the monitoring device is fixed outside the cabinet (100), a wiring harness in the monitoring device passes through a wall panel of the cabinet (100) and then extends into the immersion liquid and is connected to the plurality of battery modules (2000), and the monitoring device is configured to monitor the voltage and current of the battery module (2000).

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