Full-immersion liquid cooling device of energy storage cabinet and assembly method of full-immersion liquid cooling device

Abstract

The invention discloses an energy storage cabinet full-immersion liquid cooling device and an assembling method thereof, the energy storage cabinet full-immersion liquid cooling device comprises a battery cabinet, a battery cluster frame and a pipeline system, the battery cabinet comprises a cabinet body and a top cover, the cabinet body is an integrally formed part, immersion liquid is contained in the cabinet body, and an inert gas layer is arranged between the liquid level of the immersion liquid and the top cover; the battery cluster frame is immersed in the immersion liquid, the battery cluster frame is provided with a plurality of supporting pieces, and each supporting piece is fixedly provided with a plurality of battery modules; the pipeline system comprises a cooling unit, a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe and the liquid outlet pipe are arranged on the two sides of the battery cluster frame at intervals in the first direction, and the cooling unit, the liquid inlet pipe and the liquid outlet pipe are matched to drive the immersion liquid on the two sides of each battery module to flow in the first direction. By arranging the cabinet body and the inert gas layer, it is ensured that the sealing area of the battery cabinet does not make direct contact with immersion liquid, the cabinet body for packaging the immersion liquid is integrally formed, and the risk of liquid leakage is fundamentally eradicated.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery energy storage technology, and in particular to a fully immersed liquid cooling device for energy storage cabinet and its assembly method. Background Technology

[0002] The optimal operating temperature range for lithium-ion batteries is 20℃-40℃. When the temperature exceeds 45℃, the cycle life drops sharply. Simultaneously, lithium-ion batteries release a large amount of heat during operation; if cooling measures are not taken in time, thermal runaway will occur, causing serious damage. Existing immersion liquid cooling systems are divided into three types: Pack-level, Cluster-level, and Container-level. Pack-level immersion systems are more complex in design and have low space utilization. Container-level immersion systems are too bulky, require excessive immersion liquid, are costly, and are prone to leakage. While Cluster-level immersion liquid cooling systems have a moderate size and relatively simple structure, existing systems lack a reasonable flow channel design, failing to ensure uniform immersion liquid flow, resulting in large temperature differences within the battery system. This has led to a gradual shift towards Pack-level immersion. Furthermore, existing Cluster-level immersion systems require sealing in many areas, increasing the risk of immersion liquid leakage. Summary of the Invention

[0003] The purpose of this invention is to provide a fully immersed liquid cooling device for energy storage cabinets, which can improve the temperature uniformity of battery systems and eliminate the risk of leakage.

[0004] To achieve this objective, the present invention adopts the following technical solution: a fully immersed liquid cooling device for an energy storage cabinet, comprising a battery cabinet, a battery cluster rack, and a piping system. The battery cabinet includes a cabinet body and a top cover. The cabinet body is an integrally formed part, and the cabinet body has an upward-facing mounting cavity. The top cover is sealed to the cabinet body to close the opening of the mounting cavity. The mounting cavity is filled with immersion liquid, and an inert gas layer is provided between the liquid surface of the immersion liquid and the top cover. The top cover is provided with a sealing connection assembly. The battery cluster rack is located in the mounting cavity and immersed in the immersion liquid. The battery cluster rack is provided with multiple support members, which are spaced apart vertically. Each support member... Multiple battery modules are fixed on each of the mounting frames. The battery modules extend along a first direction and are spaced apart along a second direction. The first direction, the second direction, and the vertical direction are perpendicular to each other. The piping system includes a cooling unit, an inlet pipe, and an outlet pipe. The inlet pipe and the outlet pipe are located within the mounting cavity and are spaced apart along the first direction on both sides of the battery cluster frame. The cooling unit is connected to the inlet pipe and the outlet pipe respectively through the sealing connection assembly. The cooling unit, the inlet pipe, and the outlet pipe cooperate to drive the immersion liquid on both sides of each battery module to flow along the first direction.

[0005] Preferably, the liquid inlet pipe has multiple secondary branches, each corresponding to a support member. Each secondary branch has multiple tertiary branches, with the number of tertiary branches on the same secondary branch being one more than the number of battery modules on the corresponding support member. The tertiary branches and battery modules are staggered along the second direction. The liquid outlet pipe has multiple liquid outlets, each corresponding to a support member.

[0006] Preferably, the support includes multiple support beams, which are spaced apart along the second direction. The bottom end of the battery module abuts against two adjacent support beams, and two adjacent battery modules abut against the same support beam. The three-level branch pipe and the support beam are arranged in a one-to-one correspondence and located above the corresponding support beam.

[0007] Preferably, the piping system further includes an air inlet pipe, which is connected to the top cover and communicates with the mounting cavity, and the air inlet pipe is equipped with a valve.

[0008] Preferably, the energy storage cabinet fully immersed liquid cooling device further includes an expansion tank, which defines an outlet chamber. The expansion tank is provided with a gas interface and an openable and closable inflation port. Both the gas interface and the inflation port are connected to the gas chamber. The gas interface is connected to the air inlet pipe. An air bladder is provided in the gas chamber. The air bladder is provided with a liquid interface. A water outlet chamber is defined in the air bladder. The water outlet chamber is in contact with the immersion liquid in the mounting cavity through the liquid interface.

[0009] Preferably, the energy storage cabinet fully immersed liquid cooling device further includes an external cabinet, in which the expansion tank and the cooling unit are both installed. The external cabinet is provided with a first connecting pipe and a second connecting pipe connected to the cooling unit. The first connecting pipe is connected to the output end of the cooling unit, and the second connecting pipe is connected to the input end of the cooling unit. The sealing connection assembly includes two quick-connect fittings. The first connecting pipe and the liquid inlet pipe are inserted into the two ends of the same quick-connect fitting, and the second connecting pipe and the liquid outlet pipe are inserted into the two ends of the other quick-connect fitting.

[0010] Preferably, the cabinet body and the top cover are bolted together, and a sealing gasket is sandwiched between the cabinet body and the top cover, the sealing gasket being arranged around the mounting cavity.

[0011] Preferably, a display is provided on one side of the cabinet, and a liquid level sensor is provided inside the cabinet, with the liquid level sensor and the display being communicatively connected.

[0012] Preferably, the top of the battery cluster rack is provided with a plurality of lifting rings, which are spaced apart circumferentially along the battery cluster rack.

[0013] The purpose of this invention is to provide an assembly method for a fully immersed liquid cooling device for an energy storage cabinet, which uses inert gas to isolate the immersion liquid and the sealed area, eliminating the risk of leakage.

[0014] To achieve this objective, the present invention adopts the following technical solution: an assembly method for a fully immersion liquid cooling device for an energy storage cabinet, used for installing the aforementioned fully immersion liquid cooling device for an energy storage cabinet, comprising the following steps:

[0015] The piping system is fixed to the battery cluster frame, the battery cluster frame is fixed inside the mounting cavity, and the top cover is installed to seal the mounting cavity;

[0016] Install the cooling unit and connect it to the piping system;

[0017] After evacuating the mounting cavity, fill the mounting cavity with immersion liquid, leaving a certain space at the top of the mounting cavity during the liquid injection.

[0018] Inert gas is injected into the mounting cavity, and the injection is stopped when the pressure inside the mounting cavity reaches the preset pressure.

[0019] The beneficial effects of this invention are as follows: By setting up a cabinet and an inert gas layer, after the energy storage cabinet's fully immersed liquid cooling device is assembled, the inert gas layer separates the sealed area of ​​the cabinet and the top cover, ensuring that the sealed area of ​​the battery cabinet does not directly contact the immersion liquid. The cabinet, which encapsulates the immersion liquid, is integrally molded, fundamentally eliminating the risk of leakage. Even if leakage occurs later, it is only the inert gas layer that leaks, and will not cause any other harm. By setting up a pipeline system, when the energy storage cabinet's fully immersed liquid cooling device is working, the cooling unit injects low-temperature immersion liquid into both sides of each battery module through the liquid inlet pipe. The immersion liquid flows along the first direction and exchanges heat with the battery module before flowing into the liquid outlet pipe and returning to the cooling unit, realizing the circulation of the immersion liquid. The liquid inlet pipe and the liquid outlet pipe are spaced apart along the extension direction of the battery module, and the heat exchange paths of the immersion liquid on both sides of the battery module are of equal length, optimizing the flow channel layout and improving the temperature uniformity of the battery system.

[0020] The present invention also provides an assembly method for a fully immersed liquid cooling device for an energy storage cabinet. During the liquid injection process, a certain space is reserved at the top of the mounting cavity, and then inert gas is injected. The sealed area is smaller and isolated from the immersion liquid, eliminating the risk of leakage. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the energy storage cabinet fully immersed liquid cooling device according to an embodiment of this application;

[0022] Figure 2 This is a breakdown diagram of the fully immersed liquid cooling device for the energy storage cabinet according to an embodiment of this application;

[0023] Figure 3This is a schematic diagram of the pipeline system according to an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the immersion liquid flow in a single-layer battery module according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the battery cluster frame according to an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the structure of the expansion tank according to an embodiment of this application;

[0027] Figure 7 This is a flowchart illustrating the assembly method of the fully immersed liquid cooling device for the energy storage cabinet according to an embodiment of this application.

[0028] In the diagram: 1. Battery cabinet; 11. Cabinet body; 111. Monitor; 12. Top cover; 121. Quick connector; 2. Battery cluster rack; 21. Column; 22. First crossbeam; 23. Second crossbeam; 24. Third crossbeam; 25. Support beam; 26. Lifting ring; 3. Battery module; 31. Battery cell; 32. End plate; 4. Piping system; 41. Liquid inlet pipe; 411. Secondary branch pipe; 412. Tertiary branch pipe; 42. Liquid outlet pipe; 421. Liquid outlet; 43. Air inlet pipe; 5. Expansion tank; 51. Gas chamber; 52. Gas interface; 53. Inflation port; 54. Airbag; 541. Liquid interface; 542. Water chamber; 6. External cabinet; 61. Liquid replenishment port; 62. First connecting pipe; 63. Second connecting pipe. Specific Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0030] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0033] Reference Figures 1 to 6 As shown, a fully immersed liquid cooling device for an energy storage cabinet according to an embodiment of this application includes a battery cabinet 1, a battery cluster rack 2, and a piping system 4. The battery cabinet 1 includes a cabinet body 11 and a top cover 12. The cabinet body 11 is a vertical cuboid shape and is an integrally formed part. The side walls and bottom walls of the cabinet body 11 are integrally formed non-perforated plates. An upward-facing mounting cavity is defined inside the cabinet body 11. The top cover 12 is sealed to the cabinet body 11 to close the opening of the mounting cavity. The mounting cavity is filled with immersion liquid. An inert gas layer is provided between the liquid surface of the immersion liquid and the top cover 12. The top cover 12 is provided with a sealing connection assembly.

[0034] The battery cluster rack 2 is located within the mounting cavity and immersed in the immersion liquid, meaning the top surface of the battery cluster rack 2 is below the surface of the immersion liquid. The battery cluster rack 2 is provided with multiple support members, which are spaced apart along the vertical direction. Each support member is fixed with multiple battery modules 3. The battery modules 3 extend along a first direction, and the multiple battery modules 3 are spaced apart along a second direction. The first direction, the second direction, and the vertical direction are perpendicular to each other. In this embodiment, one of the first direction and the second direction is the length direction of the cabinet 11, and the other is the width direction of the cabinet 11. This is specifically mentioned here and will not be repeated hereafter.

[0035] The piping system 4 includes a cooling unit, an inlet pipe 41, and an outlet pipe 42. The cooling unit is a thermal management system integrating components such as a water pump, heat exchanger, and fan. The cooling unit can draw in high-temperature immersion liquid and convert it into low-temperature immersion liquid. The inlet pipe 41 and outlet pipe 42 are located within the mounting cavity and are spaced apart along a first direction on both sides of the battery cluster frame 2. The cooling unit is connected to the inlet pipe 41 and outlet pipe 42 respectively via sealing connection components. The cooling unit, inlet pipe 41, and outlet pipe 42 cooperate to drive the immersion liquid on both sides of each battery module 3 to flow along the first direction. Optionally, in some embodiments, the inlet pipe 41 and outlet pipe 42 are connected by multiple cold plates, which are staggered with the battery module 3; in other embodiments, the inlet pipe 41 injects immersion liquid into both sides of the battery module 3 through multiple branch pipes.

[0036] Understandably, by setting up the cabinet 11 and sealing connection components, since the side and bottom walls of the cabinet are integrally formed and have no openings, after the energy storage cabinet is fully immersed in liquid cooling, the inert gas layer separates the sealing area between the cabinet 11 and the top cover 12. Furthermore, the sealing connection components connecting the pipeline system 4 and the cooling unit are integrated into the top cover 12, ensuring that the sealed area of ​​the battery cabinet 1 does not come into direct contact with the immersion liquid, thus fundamentally eliminating the risk of leakage. Even if leakage occurs later, the leaked gas is inert gas and will not cause any other harm.

[0037] By setting up the piping system 4, when the energy storage cabinet's fully immersed liquid cooling device is working, the cooling unit injects low-temperature immersion liquid into both sides of each battery module 3 through the liquid inlet pipe 41. The immersion liquid flows along the first direction and exchanges heat with the battery module 3 before flowing into the liquid outlet pipe 42 back to the cooling unit, thus realizing the circulation of the immersion liquid. The liquid inlet pipe 41 and the liquid outlet pipe 42 are arranged at intervals along the extension direction of the battery module 3, and the heat exchange paths of the immersion liquid on both sides of the battery module 3 in the second direction are of equal length, optimizing the flow channel layout and improving the temperature uniformity of the battery system (i.e., the overall system composed of multiple battery modules 3).

[0038] Furthermore, the cabinet body 11 and the top cover 12 are bolted together, and a sealing gasket is sandwiched between the cabinet body 11 and the top cover 12, with the sealing gasket surrounding the mounting cavity.

[0039] By setting a sealing ring to seal the connection between the cabinet 11 and the top cover 12, the sealing structure between the cabinet 11 and the top cover 12 can be simplified, without affecting the disassembly and assembly of the top cover 12. This facilitates the later inspection and maintenance of the battery cluster 2 and the battery module 3, and reduces the later maintenance cost of the liquid cooling device.

[0040] Reference Figures 2 to 4As shown, it can be understood that the liquid inlet pipe 41 is vertically arranged and has multiple secondary branch pipes 411. The secondary branch pipes 411 extend along the second direction and are arranged in a one-to-one correspondence with the support components. The secondary branch pipes 411 have multiple tertiary branch pipes 412. One end of the tertiary branch pipe 412 is vertically arranged and connected to the secondary branch pipe 411, and the other end extends along the first direction toward the battery module 3. The number of tertiary branch pipes 412 on the same secondary branch pipe 411 is one more than the number of battery modules 3 on the corresponding support components. The tertiary branch pipes 412 and the battery modules 3 are staggered along the second direction, that is, each battery module 3 has a tertiary branch pipe 412 on both sides, and two adjacent battery modules 3 share the same tertiary branch pipe 412. The liquid outlet pipe 42 is vertically arranged and has multiple liquid outlets 421, which are arranged in a one-to-one correspondence with the support components. Optionally, the inlet pipe 41 and the outlet pipe 42 can be arranged at intervals along the first direction, or they can be arranged symmetrically along the first direction.

[0041] When the piping system 4 is working, the cryogenic immersion liquid flows from the inlet pipe 41 to multiple secondary branch pipes 411. The cryogenic immersion liquid in each secondary branch pipe 411 then flows through the tertiary branch pipe 412 to both sides of each battery module 3 on the same layer. After the immersion liquid flows in, regardless of which tertiary pipe branch it passes through, the path it travels in the first direction is of equal length. After exchanging heat with the battery module 3, the immersion liquid enters the outlet pipe 42 from the outlet port 421 and finally returns to the cooling unit for circulation, with the inlet pipe 41 and outlet pipe 42 spaced apart along the first direction. By setting up the secondary branch pipes 411 and tertiary branch pipes 412, the cryogenic immersion liquid is precisely injected into both sides of each battery module 3, and the traditional cold plate structure is eliminated, allowing the immersion liquid to directly contact the battery module 3, reducing the load on the battery cluster 2, balancing the immersion liquid flow resistance, improving the uniformity of immersion liquid flow, and further improving the temperature uniformity of the battery system.

[0042] Reference Figure 2 and Figure 5 As shown, it can be understood that the support includes multiple support beams 25, which are spaced apart along the second direction. The bottom end of the battery module 3 abuts against two adjacent support beams 25, and two adjacent battery modules 3 abut against the same support beam 25. The three-level branch pipe 412 and the support beam 25 are arranged one-to-one and located above the corresponding support beam 25.

[0043] Specifically, the battery cluster frame 2 includes four vertically arranged columns 21 in a matrix configuration. Four first crossbeams 22 are staggered at the top of each column 21. The ends of each first crossbeam 22 are welded to two adjacent columns 21. Along a second direction, multiple second crossbeams 23 are symmetrically arranged on both sides of the battery cluster frame 2. The second crossbeams 23 extend along a first direction and are of the same specifications as the first crossbeams 22. The ends of each second crossbeam 23 are welded to two columns 21 spaced apart in the first direction. Two second crossbeams 23 are symmetrically arranged at the bottom of the battery cluster frame 2. Along the first direction, multiple third crossbeams 24 are symmetrically arranged on both sides of the battery cluster frame 2. The third crossbeams 24 extend along the second direction and are correspondingly arranged with the supporting members. The ends of each third crossbeam 24 are welded to two columns 21 spaced apart in the second direction. Support beams 25 extend along the first direction, and the ends of each support beam 25 are bolted or welded to two opposing third crossbeams 24 at the same height.

[0044] The battery module 3 includes multiple battery cells 31 and two end plates 32. The multiple battery cells 31 are arranged along a first direction, and a cell heat-insulating sheet is sandwiched between two adjacent battery cells 31. The two end plates 32 are fixed to both ends of the battery module 3 (i.e., on opposite sides of two battery cells 31 located at both ends in the first direction). The end plates 32 at both ends of the battery module 3 are bolted to two third crossbeams 24 at both ends of the support member so that the bottom surface of the battery module 3 abuts against the support member. In this embodiment, there are two second crossbeams 23 on one side of the battery cluster frame 2 and eight third crossbeams 24 on one side (eight corresponding to the support member). Five battery modules 3 are fixed on each support member.

[0045] By setting multiple support beams 25, on the one hand, two adjacent battery modules 3 abut against the same support beam 25, and the support beam 25 can separate the gaps between adjacent battery modules 3 in the vertical direction, preventing the immersion liquid after heat exchange between the upper battery modules 3 from flowing into the gaps between the lower battery modules 3 and affecting the heat exchange of the lower battery modules 3. This makes the battery modules 3 on different support members separate from each other, and the immersion liquid flowing out of each tertiary branch pipe 412 only flows on the corresponding support member, further improving the uniformity and consistency of the immersion liquid flow and ensuring that the temperature of each layer of battery modules 3 is consistent.

[0046] Reference Figure 5 As shown, it can be understood that the top of the battery cluster frame 2 is provided with multiple lifting rings 26, which are spaced apart along the circumference of the battery cluster frame 2. In this embodiment, there are four lifting rings 26, which are respectively fixed to the top of four columns 21 (that is, the four lifting rings 26 are distributed at the four corners of the top of the battery cluster frame 2).

[0047] By setting up lifting rings 26, external lifting tools can be used for hoisting during the assembly of battery cluster frame 2, thereby improving the loading and unloading efficiency of battery cluster frame 2.

[0048] Reference Figure 1 and Figure 3 As shown, it can be understood that the piping system 4 also includes an air inlet pipe 43, which is connected to the top cover 12 and communicates with the mounting cavity. A valve is provided on the air inlet pipe 43 to control the opening or closing of the air inlet pipe 43.

[0049] By setting up an air inlet pipe 43, the air inlet pipe 43 can be connected to an external inert gas source or inert gas container, which makes it convenient for users to replenish or extract inert gas during subsequent use, thereby improving the ease of use of the liquid cooling device.

[0050] Reference Figure 3 and Figure 6 As shown, the fully immersed liquid cooling device for the energy storage cabinet also includes an expansion tank 5. The expansion tank 5 defines an outlet chamber 51, which is pre-filled with a certain amount of inert gas. The expansion tank 5 is equipped with a gas interface 52 and an openable / closable inflation port 53, both of which are connected to the outlet chamber 51. The gas interface 52 is connected to an inlet pipe 43. The outlet chamber 51 contains an inflatable or retractable air bladder 54, which has a liquid interface 541. The air bladder 54 defines a water outlet chamber 542, which is connected to the immersion liquid circuit, allowing the water outlet chamber 542 to contact the immersion liquid in the mounting cavity through the liquid interface 541. At this time, the valve on the inlet pipe 43 is configured as a normally closed valve. When the system is operating normally, the normally closed valve isolates the gas chamber 51 from the inert gas layer, allowing the gas chamber 51 to work independently. When inert gas needs to be replenished, the valve is opened to connect the gas chamber 51 and the inert gas layer, and inert gas is injected into the gas filling port 53 to replenish the inert gas layer.

[0051] By setting up the expansion tank 5, when the water pump starts, the pressure of the immersion liquid increases, and the water pressure in the water chamber 542 increases synchronously. At this time, the air bladder 54 expands under pressure, compressing the inert gas in the air chamber 51, thus increasing the air pressure in the air chamber 51, achieving pressure balance, suppressing fluctuations in the immersion liquid, and improving the flow stability of the immersion liquid. When the battery module 3 operates for a certain period of time, the battery module 3 heats the immersion liquid, causing the immersion liquid in the cabinet 11 to heat up and expand, and the water pressure to increase. The immersion liquid in the water chamber 542 heats up and expands synchronously, and the pressure to increase. The air bladder 54 will expand outward to compress the inert gas in the air chamber 51, achieving pressure balance and preventing sudden increases in internal system pressure from damaging components. Subsequently, the user can also open the inflation port 53 to inflate or deflate the mounting cavity to ensure stable system operation.

[0052] Furthermore, the energy storage cabinet's fully immersed liquid cooling device also includes an external cabinet 6, located on one side of the battery cabinet 1. The expansion tank 5 and the cooling unit are both installed inside the external cabinet 6. The external cabinet 6 is equipped with a first connecting pipe 62 and a second connecting pipe 63. The first connecting pipe 62 is connected to the output end of the cooling unit, and the second connecting pipe 63 is connected to the input end of the cooling unit. The sealing connection assembly includes two quick-connect fittings 121, which are fixed to the top cover 12 by high-strength sealing adhesive. The interfaces at both ends of the quick-connect fittings 121 are located on both sides of the top cover 12. The first connecting pipe 62 and the liquid inlet pipe 41 are inserted into the two ends of the same quick-connect fitting 121, and the second connecting pipe 63 and the liquid outlet pipe 42 are inserted into the two ends of the other quick-connect fitting 121. In addition, the side wall of the external cabinet 6 is also equipped with an openable and closable liquid inlet 61, which communicates with the cooling unit to add immersion liquid into the installation cavity.

[0053] By installing an external cabinet 6, which integrates the cooling unit and expansion tank 5, not only is the cooling unit and expansion tank 5 protected, but users can also easily debug, inspect, maintain, or replace them, effectively improving the integration of the liquid cooling system. The quick-connect fitting 121 ensures the sealing of the installation cavity while facilitating the fixed connection of the piping system 4, further enhancing the ease of installation and removal of the liquid cooling system.

[0054] Reference Figure 1 As shown, it can be understood that a display 111 is provided on one side of the cabinet 11, and a liquid level sensor is provided inside the cabinet 11. The liquid level sensor and the display 111 are connected in communication.

[0055] By setting up a display 111 and a liquid level sensor, the liquid level sensor can detect the liquid level height of the immersion liquid in the installation cavity in real time, and the display 111 can display the liquid level height detected by the liquid level sensor, so that users can easily observe whether the remaining amount of immersion liquid is within a reasonable range, and then determine whether it is necessary to replenish the liquid in time, thereby improving the user experience.

[0056] It should be noted that non-contact liquid level sensors, such as ultrasonic liquid level sensors, radar liquid level sensors, and laser liquid level sensors, are selected to avoid opening holes in the side wall of cabinet 11 and to avoid the risk of leakage.

[0057] Reference Figure 7 As shown, an assembly method for a fully immersion liquid cooling device for an energy storage cabinet, according to an embodiment of this application, is used to install the aforementioned fully immersion liquid cooling device for an energy storage cabinet, and includes the following steps:

[0058] S1. Fix the piping system 4 to the battery cluster 2, fix the battery cluster 2 inside the mounting cavity, and install the top cover 12 to seal the mounting cavity;

[0059] Specifically, during the assembly of the fully immersed liquid cooling device for the energy storage cabinet, firstly, the inlet pipe 41 and outlet pipe 42 in the piping system 4 are fixed to the battery cluster frame 2. The fixing method can be cable ties or other methods. Then, the battery cluster frame 2 is hoisted and placed into the mounting cavity of the cabinet 11, and fixed using corner keys or other methods. Next, the top cover 12 is fixed to seal the mounting cavity. After the quick-connect connector 121 on the top cover 12 is connected to the piping system 4, it is sealed. A sealing gasket is placed between the top cover 12 and the cabinet 11, and then bolts are used to tighten and seal the area. Alternatively, sealant can be applied to ensure a tight seal.

[0060] S2. Install the cooling unit and connect it to the piping system 4;

[0061] After the battery cabinet 1 is assembled, the liquid inlet pipe 41 and liquid outlet pipe 42 of the pipeline system 4 are connected to the cooling unit through the first connecting pipe 62 and the second connecting pipe 63, and the air inlet pipe 43 is connected to the external vacuum device. Then, the external cabinet 6 is fixed to one side of the battery cabinet 1.

[0062] S3. After evacuating the mounting cavity, fill the mounting cavity with immersion liquid, leaving a certain space at the top of the mounting cavity when filling the liquid;

[0063] S4. Inject inert gas into the mounting cavity, and stop injecting when the pressure inside the mounting cavity reaches the preset pressure.

[0064] After liquid injection, connect the air inlet pipe 43 to the expansion tank 5, and start filling inert gas through the air inlet 53. The inert gas will fill to the top of the cabinet 11 through the expansion tank 5 and the air inlet pipe 43 and form an inert gas layer. Stop filling when the required system pressure is reached.

[0065] Understandably, a certain space is reserved at the top of the mounting cavity during assembly and liquid injection, followed by the filling with inert gas. This minimizes the sealing area and isolates it from the immersion liquid, eliminating the risk of leakage. The pressure of the inert gas at the top of the cabinet 11 and the liquid below is balanced by the expansion tank 5, ensuring stable system operation. Even if a leak occurs later, it will be inert gas, posing no other harm. Maintenance can be performed by refilling with inert gas.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An energy storage tank full-submersion liquid cooling device, characterized in that, The battery cabinet (1) comprises a cabinet body (11) and a top cover (12), the cabinet body (11) is an integral forming, the cabinet body (11) is provided with an installation cavity with an opening facing upward, the top cover (12) is sealingly connected with the cabinet body (11) to close the opening of the installation cavity, the installation cavity contains immersion liquid, an inert gas layer is arranged between the liquid surface of the immersion liquid and the top cover (12), and the top cover (12) is provided with a sealing connection assembly. The battery cluster frame (2) is located in the installation cavity and immersed in the immersion liquid, the battery cluster frame (2) is provided with a plurality of support members, the plurality of support members are arranged at intervals in the vertical direction, a plurality of battery modules (3) are fixed on each support member, the battery modules (3) are arranged in extension in a first direction, and a plurality of battery modules (3) are arranged at intervals in a second direction, wherein the first direction, the second direction and the vertical direction are perpendicular to each other. The pipeline system (4) comprises a cooling unit, an inlet pipe (41) and an outlet pipe (42), the inlet pipe (41) and the outlet pipe (42) are located in the installation cavity, the inlet pipe (41) and the outlet pipe (42) are arranged at intervals on both sides of the battery cluster frame (2) in the first direction, and the cooling unit is connected with the inlet pipe (41) and the outlet pipe (42) through the sealing connection assembly, so that the cooling unit, the inlet pipe (41) and the outlet pipe (42) cooperate to drive the immersion liquid on both sides of each battery module (3) to flow in the first direction. The inlet pipe (41) is provided with a plurality of secondary branch pipes (411), the secondary branch pipes (411) and the support members are arranged one by one, the secondary branch pipes (411) are provided with a plurality of tertiary branch pipes (412), the number of the tertiary branch pipes (412) on the same secondary branch pipe (411) is one more than the number of the battery modules (3) on the corresponding support member, the tertiary branch pipes (412) and the battery modules (3) are staggered in the second direction, and the outlet pipe (42) is provided with a plurality of outlet openings (421), the outlet openings (421) and the support members are arranged one by one.

2. The full-submersion liquid cooling apparatus for an energy storage tank according to claim 1, wherein, The support member comprises a plurality of support beams (25), the plurality of support beams (25) are arranged at intervals in the second direction, the bottom ends of the battery modules (3) abut against adjacent two support beams (25), and adjacent two battery modules (3) abut against the same support beam (25), the tertiary branch pipes (412) and the support beams (25) are arranged one by one and located above the corresponding support beams (25).

3. The full-submersion liquid cooling apparatus for an energy storage tank according to claim 2, wherein, The pipeline system (4) further comprises an air inlet pipe (43), the air inlet pipe (43) is connected with the top cover (12) and communicates with the installation cavity, and a valve is arranged on the air inlet pipe (43).

4. The full-submersion liquid cooling apparatus for an energy storage tank of claim 1, wherein, ​ 5. The full-submersion liquid cooling apparatus for an energy storage tank of claim 4, wherein, The energy storage cabinet full-immersion liquid cooling device further comprises an expansion tank (5), the expansion tank (5) defines a gas chamber (51) therein, the expansion tank (5) is provided with a gas interface (52) and an openable and closable inflation port (53), the gas interface (52) and the inflation port (53) are both in communication with the gas chamber (51), the gas interface (52) is connected with the gas inlet pipe (43), the gas chamber (51) is provided with an air bag (54), the air bag (54) is provided with a liquid interface (541), the air bag (54) defines a water chamber (542) therein, and the water chamber (542) is in contact with the immersion liquid in the mounting cavity through the liquid interface (541).

6. The full-submersion liquid cooling apparatus for an energy storage tank of claim 5, wherein, The energy storage cabinet full-immersion liquid cooling device further comprises an external cabinet (6), the expansion tank (5) and the cooling unit are both installed in the external cabinet (6), the external cabinet (6) is provided with a first connecting pipe (62) and a second connecting pipe (63) connected with the cooling unit, the first connecting pipe (62) is connected with the output end of the cooling unit, the second connecting pipe (63) is connected with the input end of the cooling unit, and the sealing connection assembly comprises two quick plug connectors (121), the first connecting pipe (62) and the liquid inlet pipe (41) are plugged and matched with two ends of the same quick plug connector (121), and the second connecting pipe (63) and the liquid outlet pipe (42) are plugged and matched with two ends of the other quick plug connector (121).

7. The full-submersion liquid cooling apparatus for an energy storage tank according to claim 1 or 6, characterized in that, The cabinet body (11) and the top cover (12) are bolted, and a sealing gasket is clamped between the cabinet body (11) and the top cover (12), and the sealing gasket is arranged around the mounting cavity.

8. The full-submersion liquid cooling apparatus for an energy storage tank of claim 1, wherein, One side of the cabinet body (11) is provided with a display (111), and the cabinet body (11) is provided with a liquid level sensor, and the liquid level sensor and the display (111) are in communication connection.

9. The full-submersion liquid cooling apparatus for an energy storage tank of claim 1, wherein, The top end of the battery cluster frame (2) is provided with a plurality of lifting rings (26), and the plurality of lifting rings (26) are arranged at intervals along the circumference of the battery cluster frame (2).

10. An assembling method of an energy storage tank full-submersion liquid cooling device, for installing the energy storage tank full-submersion liquid cooling device according to any one of claims 1-9, characterized in that, The following steps are included: Fix the pipeline system (4) to the battery cluster frame (2), fix the battery cluster frame (2) in the mounting cavity, and install the top cover (12) to seal the mounting cavity; Install the cooling unit and connect the pipeline system (4); After the mounting cavity is evacuated, the immersion liquid is filled into the mounting cavity, and a certain space is reserved at the top of the mounting cavity during liquid injection; Inert gas is filled into the mounting cavity, and the filling is stopped when the pressure in the mounting cavity reaches the preset pressure.

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