A semi-submersible liquid-cooled battery pack and energy storage device

Abstract

The application provides a semi-submerged liquid-cooled battery pack and energy storage equipment, and relates to the technical field of battery equipment. The semi-submerged liquid-cooled battery pack comprises an upper cover body, a lower box body, a sealing element, a battery cell module and a heat exchange pipe. The upper cover body is arranged on the lower box body. The lower box body comprises a bottom plate and a groove body. The groove body is arranged on the bottom plate. The battery cell module is arranged in the groove body. The sealing element is connected between the groove wall of the groove body and the battery cell module and is spaced from the bottom plate to seal the cooling liquid in the groove body. The heat exchange pipe is arranged between two adjacent rows of battery cells of the battery cell module and is connected with a liquid cooling unit. The maintenance and repair are facilitated, and the maintenance and repair cost is saved. Meanwhile, the heat exchange pipe exchanges heat with the cooling liquid in the groove body and the battery cell module, the uniformity of the heat exchange of the cooling liquid in the groove body is improved, and the heat exchange efficiency is improved through the active circulation heat exchange of the cooling liquid in the groove body by the heat exchange pipe.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a semi-immersed liquid-cooled battery pack and energy storage device. Background Technology

[0002] As a key energy carrier for electrical equipment such as new energy vehicles and energy storage power stations, the stability of lithium-ion batteries' operating temperature is crucial to the equipment's operating efficiency and safety. To address the battery overheating problem, the industry has developed various thermal management technologies. Among them, traditional cold plate liquid cooling conducts heat through contact between a metal plate and the battery surface, which is an improvement over air cooling, but it suffers from contact thermal resistance and limited heat exchange efficiency, making it difficult to meet the heat dissipation requirements of high-power-density battery packs. While fully immersion liquid cooling can improve heat exchange efficiency, it places higher demands on the overall structural design.

[0003] In related technologies, traditional heat exchange methods generally suffer from low efficiency: cold plate liquid cooling cannot fully dissipate the heat from the battery cell due to contact thermal resistance, resulting in a large temperature difference within the battery pack; fully immersed liquid cooling relies solely on natural convection of the coolant, which is insufficient to meet the heat dissipation requirements of high-power scenarios, and its heat exchange efficiency also needs to be improved. Utility Model Content

[0004] One or more embodiments of this application are intended to solve or at least partially alleviate the current problem of how to improve the heat exchange efficiency of battery packs.

[0005] This application provides one or more embodiments of a semi-immersed liquid-cooled battery pack, including an upper cover, a lower housing, a sealing element, a cell module, and a heat exchange tube. The upper cover covers the lower housing, and the lower housing includes a bottom plate and a groove. The groove has a receiving slot and is disposed on the bottom plate. The cell module is disposed in the groove. The sealing element is connected between the groove wall of the groove and the cell module and forms a gap with the bottom plate to seal the coolant contained in the groove. The heat exchange tube is disposed between two adjacent rows of cells of the cell module and is used to connect to a liquid cooling unit.

[0006] Optionally, the semi-immersed liquid-cooled battery pack further includes an inlet pipe and an outlet pipe respectively connected to the liquid cooling unit. The inlet pipe and the outlet pipe are respectively connected to the inlet end and the outlet end of the heat exchange tube. The inlet pipe and the outlet pipe are respectively disposed on the bottom plate and are both located outside the tank.

[0007] Optionally, the outer wall of the heat exchange tube is provided with fins.

[0008] Optionally, the heat exchange tube is arranged along the length of the battery cell module, and the heat exchange tube is arranged in an S-shape in the vertical plane.

[0009] Optionally, the semi-immersed liquid-cooled battery pack further includes a support rod assembly, the heat exchange tube is connected to the support rod assembly, and the support rod assembly is vertically connected to the mounting structure of the cell module and / or the lower housing.

[0010] Optionally, the support rod assembly includes a first support rod and a second support rod, the first support rod and the second support rod being connected to both ends of the heat exchange tube along its length, and the inlet and outlet ends of the heat exchange tube being embedded within the second support rod.

[0011] Optionally, the support rod assembly further includes a third support rod, which is connected to the middle of the heat exchange tube along its length.

[0012] Optionally, the semi-immersed liquid-cooled battery pack further includes an electrical auxiliary component electrically connected to the cell module, the electrical auxiliary component being disposed on the base plate and located outside the tank.

[0013] Optionally, the seal is located at a height position of 75% to 85% of the cell of the cell module.

[0014] Compared with the prior art, the semi-immersed liquid-cooled battery pack provided in this application has, but is not limited to, the following technical effects: The semi-immersed liquid-cooled battery pack provided in this application can be applied to, for example, new energy vehicles or energy storage systems. It features a lower casing structure with a base plate forming a tank. The tank houses the battery cell modules and holds coolant, creating an immersion cooling structure. By installing a seal between the tank wall and the battery cell modules, the coolant is sealed only within the tank housing the battery cell modules. The top of the battery cell modules, such as the terminals, can be placed above the seal, i.e., above the coolant surface. Compared to traditional fully immersed liquid-cooled structures, this semi-immersed liquid-cooled structure not only saves on coolant usage but also facilitates inspection and maintenance of the top of the battery cell modules, such as the terminals. Furthermore, other components requiring frequent maintenance and repair can be installed at the bottom. The upper cover completely covers the lower casing, achieving a stable and sealed overall structure. When maintenance and repair of components other than the battery cell module are required, only the upper cover needs to be opened, eliminating the need for repeated filling and draining of the coolant, thus saving costs and facilitating maintenance. Furthermore, by installing heat exchange tubes between adjacent rows of battery cells in the battery cell module and connecting them to an external liquid cooling unit, the refrigerant flows within the heat exchange tubes under the drive of the liquid cooling unit. This allows the heat exchange tubes to exchange heat with the coolant and battery cell module within the tank, preventing excessive temperature differences in different areas of the coolant due to lack of flow driving force, improving the uniformity of coolant heat exchange within the tank, and enhancing heat exchange efficiency through active circulation of coolant heat within the tank via the heat exchange tubes.

[0015] In addition, one or more embodiments of this application provide an energy storage device, including the semi-immersed liquid-cooled battery pack described above.

[0016] The energy storage device described in this application has the same advantages over the prior art as the semi-immersed liquid-cooled battery pack, and will not be repeated here. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this application and are not intended to limit this application.

[0018] Figure 1 This is an exploded structural diagram of a semi-immersed liquid-cooled battery pack according to an embodiment of this application; Figure 2 This is a top view of the box structure in an embodiment of this application. Figure 1 ; Figure 3 This is a schematic diagram of the main structure of the box in an embodiment of this application; Figure 4 This is a three-dimensional structural diagram of the sealing element according to an embodiment of this application; Figure 5 This is a three-dimensional structural diagram of the box body according to an embodiment of this application; Figure 6 This is a top view of the box structure in an embodiment of this application. Figure 2 ; Figure 7 This is a schematic diagram of the front view of the heat exchange tube in an embodiment of this application; Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure.

[0019] Explanation of reference numerals in the attached figures: 10-Upper cover, 20-Lower housing, 21-Base plate, 22-Trench, 30-Sealing element, 31-Separator strip, 40-Battery cell module, 41-Crossbeam, 50-Electrical auxiliary components, 51-Electrical control components, 52-Fuse assembly, 53-High voltage plug-in assembly, 60-Heat exchange tube, 61-Fin, 62-Water inlet end, 63-Water outlet end, 71-Water inlet pipe, 72-Water outlet pipe, 81-First support rod, 82-Second support rod, 83-Third support rod, 84-Screw, 841-Connecting hole, X-Battery cell arrangement direction. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0021] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this application, it should be understood that the terms "center", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, 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 this application.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, the term "implementation" means that a specific feature, structure, or characteristic described in connection with an implementation can be included in at least one implementation of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same implementation, nor is it a separate or alternative implementation mutually exclusive with other implementations. Those skilled in the art will understand, explicitly and implicitly, that the implementations described in this application can be combined with other implementations.

[0025] As mentioned above, it should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, components, or groups of features, integers, steps, or components. As used in this application, the singular forms "a," "an," and "the" also include the plural forms, unless the context clearly indicates otherwise.

[0026] The terms “a” and “an” used in this specification may mean one, but may also be used interchangeably with “at least one” or “one or more”. The term “about” generally means the mentioned value plus or minus 10%, or more specifically, plus or minus 5%. The term “or” used in the claims means “and / or” unless it is explicitly stated that it refers only to alternatives.

[0027] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0028] One or more embodiments of this application provide a semi-immersed liquid-cooled battery pack. Figure 1 An embodiment of the semi-immersed liquid-cooled battery pack provided in this application.

[0029] like Figure 1As shown, the semi-immersed liquid-cooled battery pack includes an upper cover 10, a lower housing 20, a sealing element 30, a cell module 40, and a heat exchange tube 60. The upper cover 10 covers the lower housing 20. The lower housing 20 includes a bottom plate 21 and a groove 22. The groove 22 is provided with a receiving groove and is disposed on the bottom plate 21. The cell module 40 is disposed in the groove 22. The sealing element 30 is connected between the groove wall of the groove 22 and the cell module 40 and forms a gap with the bottom plate 21 to seal the coolant contained in the groove 22. The heat exchange tube 60 is disposed between two adjacent rows of cells of the cell module 40 and is used to connect to the liquid cooling unit.

[0030] In some embodiments, the semi-immersed liquid-cooled battery pack is rectangular in shape, meaning the upper cover 10 is rectangular. It can extend downwards along its four sides to form a cover structure, or it can extend upwards along its four sides to seal against the upper cover 10. The bottom plate 21 is rectangular, and the groove 22 is rectangular. The groove 22 can be integrally formed with the bottom plate 21, meaning the bottom of the groove 22 is part of the bottom plate 21. The groove 22 has an open top surface and can also be formed by four-sided surrounding plates on the bottom plate 21. Simultaneously, the cell module 40 is a matrix structure formed by multiple cells connected in series or parallel, and is also rectangular in shape, resulting in a more regular structure and easier overall installation. The number of heat exchange tubes 60 is multiple, such as... Figure 1 As shown, there are three heat exchange tubes, which can be connected in series to the liquid cooling unit. Of course, a sealing structure such as a sealing ring is provided at the connection between the heat exchange tube 60 and the liquid cooling unit to prevent the refrigerant and the coolant in the tank 22 from leaking out, thereby improving the overall sealing stability.

[0031] In at least one embodiment, the semi-immersed liquid-cooled battery pack can be applied to, for example, new energy vehicles or energy storage systems. By setting a lower housing 20 structure with a tank 22 on the base plate 21, the tank 22 can be used to install the battery cell module 40 and hold coolant, forming an immersion cooling structure. A sealing element 30 is provided between the tank wall of the tank 22 and the battery cell module 40, effectively sealing the coolant only within the housing of the battery cell module 40. Simultaneously, the top of the battery cell module 40, such as the terminals, can be placed above the sealing element 30, i.e., above the coolant surface. This semi-immersed liquid-cooled structure, compared to a traditional fully immersed liquid-cooled structure, not only saves on coolant usage but also facilitates inspection and maintenance of the top of the battery cell module 40, such as the terminals. Furthermore, other components requiring frequent maintenance and repair can be installed at the bottom. The upper cover 10 completely covers the lower housing 20 on the plate 21, achieving a stable and sealed overall structure. When maintenance and repair of components other than the battery cell module 40 are required, only the upper cover 10 needs to be opened, eliminating the need for repeated filling and draining of the coolant, saving costs and facilitating maintenance. At the same time, by setting heat exchange tubes 60 between two adjacent rows of battery cells in the battery cell module 40 and connecting them to an external liquid cooling unit, the refrigerant flows in the heat exchange tubes 60 under the drive of the liquid cooling unit, allowing the heat exchange tubes 60 to exchange heat with the coolant in the tank 22 and the battery cell module 40. This prevents excessive temperature differences in different areas of the coolant in the tank 22 due to the lack of flow driving force, improves the uniformity of heat exchange of the coolant in the tank 22, and improves heat exchange efficiency by actively circulating and exchanging heat with the coolant in the tank 22 through the heat exchange tubes 60.

[0032] Optionally, such as Figures 1 to 3 As shown, the semi-immersed liquid-cooled battery pack also includes an electrical auxiliary component 50 electrically connected to the cell module 40. The electrical auxiliary component 50 is disposed on the base plate 21 and located outside the tank 22.

[0033] In some embodiments, the electrical auxiliary component 50 refers to a functional module that transmits electrical signals or manages power with the cell module 40. Specifically, it can be implemented using a battery management system, a voltage sampling harness, or an electrical connector, and it maintains an electrical connection with the cell module 40 through wires or plug-in ports. The "positioning on the base plate 21" means that the electrical auxiliary component 50 is fixedly installed on the surface of the base plate 21 and is located outside the tank 22. This can be achieved through bolt fastening or snap-fit ​​positioning. This arrangement physically isolates the electrical auxiliary component 50 from the coolant inside the tank 22. Specifically, the electrical auxiliary components 50 include an electronic control component 51, a fuse component 52, and a high-voltage plug-in component 53. The electronic control component 51 is the core of the battery pack's data acquisition and management, mainly responsible for battery information acquisition, monitoring, protection, and communication management to ensure the safe and efficient operation of the battery pack. The fuse component 52 acts as an "automatic switch" in the circuit. It is a current protector that melts its fusible element due to the heat generated when the current exceeds a specified value for a certain period, thus breaking the circuit. The high-voltage plug-in component 53 mainly establishes reliable electrical connections between modules, ensuring power transmission between high-voltage equipment such as battery modules, inverters, and DC fast charging modules. These components are all important parts within the battery pack and require frequent testing, maintenance, or repair.

[0034] In at least one embodiment, by placing the electrical auxiliary component 50 on the base plate 21, a stable support and installation structure can be provided. At the same time, by placing the electrical auxiliary component 50 outside the tank 22, the electrical auxiliary component 50 is in a non-immersion area, avoiding coolant immersion and reducing the risk of seal failure, electrochemical corrosion, etc. Furthermore, there is no need to drain the coolant during inspection, maintenance, or repair; only the upper cover 10 needs to be opened, which greatly shortens maintenance time and saves maintenance costs.

[0035] Optionally, such as Figure 1 , Figure 2 and Figure 4 As shown, the seal 30 is located at a height position of 75% to 85% of the battery cell in the battery cell module 40.

[0036] In some embodiments, the battery cell module 40 is formed by a matrix arrangement of multiple battery cell units 41, and the battery cell units 41 are vertically arranged. The height position of the seal 30 refers to the longitudinal coordinate range of its mounting plane relative to the total height of the battery cell. Preferably, the seal 30 is installed at 80% height of the battery cell in the battery cell module 40. This height ensures the immersion heat exchange efficiency of the high-heat-generating area of ​​the battery cell module 40 while minimizing the amount of coolant used.

[0037] In at least one embodiment, by setting the seal 30 at a height of 75% to 85% of the cell of the cell module 40, the cost of coolant usage is effectively reduced, the maintenance operation process is simplified, and the heat dissipation efficiency of the cell module 40 in high-temperature areas is ensured. The dry and wet partition structure formed by setting the height of the seal 30 facilitates the inspection and maintenance of the top of the cell module 40.

[0038] Optionally, such as Figure 1 and Figure 4 As shown, the sealing element 30 is an elastic structure, and the sealing element 30 is compressed between the groove wall plate of the groove 22 and the battery cell module 40.

[0039] In some embodiments, an elastic structure refers to a material or component that can deform under external force and return to its original shape after the external force is removed. Specifically, it can be implemented using rubber or silicone-based polymer materials, where the elastic deformation of the material itself compensates for fluctuations in the assembly gap. The compressed state refers to the pre-tightening force generated when the seal 30 is squeezed by the groove wall plate and the battery module 40 during installation. This can be achieved by adjusting the difference between the initial thickness of the seal and the installation gap, ensuring that the sealing interface is always in a state of force-fitted contact.

[0040] In at least one embodiment, by setting the seal 30 as an elastic structure and compressing it between the tank wall of the tank 22 and the battery module 40, the elastic seal 30, after being compressed between the tank wall and the battery module 40, generates a rebound force inside that acts on both sides of the contact surface, forcing the seal to form a continuous compression with the tank wall and the outer wall of the battery module 40. When the battery module 40 experiences dimensional fluctuations due to temperature changes or mechanical vibrations, the deformation capability of the elastic structure can adaptively adjust the contact pressure, avoiding seal failure caused by gap expansion. At the same time, the reaction force generated by the compression deformation of the seal 30 can limit the displacement amplitude of the battery module 40, preventing it from shifting under dynamic operating conditions. Furthermore, the elastic seal 30 is easy to install and its height position can be adjusted. Optionally, such as Figure 1 , Figure 2 and Figure 4 As shown, the sealing member 30 is a rectangular frame body that is adapted to the groove shape of the groove body 22, and a partition strip 31 is provided in the rectangular frame body along the cell arrangement direction X of the cell module 40. The partition strip 31 is compressed between two adjacent rows of cells.

[0041] In some embodiments, the rectangular frame refers to a closed ring structure that coincides with the projection of the opening plane of the groove 22. Specifically, it can be made of rubber or silicone material through molding, and its outer contour dimensions perfectly match the edge of the groove, forming a continuous sealing interface at the edge of the groove. Wherein, as... Figure 2As shown in the figure, the direction indicated by the arrow, that is, the horizontal direction to the left and right, is the cell arrangement direction X. The separator 31 refers to the strip-shaped structure extending along the cell arrangement direction X. Specifically, it can be integrally molded with an elastomer of the same material as the frame body. Its thickness can be slightly larger than the spacing between adjacent cell rows. It fills the gap between cell rows through compression deformation to form an isolation barrier between cell rows.

[0042] In at least one embodiment, by setting the sealing element 30 as a rectangular frame body adapted to the groove of the tank 22, and setting the separator strip 31 along the cell arrangement direction X inside the frame, the separator strip 31 is compressed between adjacent cells. When the cell module 40 is installed into the tank 22, the rectangular frame body is pressed between the edge of the groove and the top of the cell module 40. Its outer edge is tightly attached to the groove wall due to elastic deformation, forming a circumferential seal to prevent coolant leakage. The separator strip 31 inside the frame body is embedded in the gap between adjacent cell rows. Due to compression, a radial rebound force is generated, which not only eliminates the assembly gap between cell rows, but also forms a longitudinal isolation zone. This isolation zone divides the coolant flow path into multiple channels parallel to the cell arrangement direction X, forcing the coolant to flow evenly along the side of the cell. This avoids the problem of insufficient contact area caused by the coolant only flowing along the periphery of the module in the traditional solution, thereby ensuring structural stability and sealing while improving heat exchange efficiency.

[0043] Optionally, such as Figure 1 and Figure 4 As shown, the sealing element 30 is an integrally molded rubber cotton.

[0044] In some embodiments, integral molding refers to forming a complete sealed structure in one step through mold processing, specifically using rubber injection molding, to eliminate splicing gaps and ensure structural integrity. Rubber cotton refers to an elastomer made of foamed rubber material, specifically closed-cell foamed silicone rubber, whose compression rebound characteristics can adaptively fill assembly gaps. In at least one embodiment, by setting the sealing element 30 as a one-piece molded rubber cotton, during the assembly process of the battery cell module 40 and the tank wall of the tank 22, the rubber cotton material undergoes elastic deformation under pressure, tightly fitting the irregular gap between the side of the battery cell and the tank wall, forming a continuous sealing interface. Furthermore, the sealing element 30, manufactured by the one-piece molding process, does not require additional splicing processes and can be directly embedded into the preset installation position of the battery cell module 40 and the tank wall. Under the action of longitudinal compression force, its internal closed-cell structure is uniformly stressed, avoiding sealing failure caused by local stress concentration, further improving sealing performance and installation convenience.

[0045] Optionally, such as Figure 1 , Figures 5 to 8As shown, the semi-immersed liquid-cooled battery pack also includes an inlet pipe 71 and an outlet pipe 72 that are respectively connected to the liquid cooling unit. The inlet pipe 71 and the outlet pipe 72 are respectively connected to the inlet end 62 and the outlet end 63 of the heat exchange tube 60. The inlet pipe 71 and the outlet pipe 72 are respectively disposed on the base plate 21 and are both located outside the tank 22.

[0046] In some embodiments, the liquid cooling unit refers to a device that provides power for the circulation of cooling medium. Specifically, it can be an integrated module with a pump and a heat exchanger. The inlet pipe 71 and the outlet pipe 72 can be embedded in the base plate 21 or connected to the base plate 21 via connectors. Sealing structures such as sealing rings can be provided at the connection ends of the inlet pipe 71 and the inlet end 62 of the liquid cooling unit and the heat exchange tube 60, respectively, and at the connection ends of the outlet pipe 82 and the outlet end 63 of the liquid cooling unit and the heat exchange tube 60, respectively. Sealing structures such as sealing rings can also be provided at the locations where the inlet pipe 71 and the outlet pipe 72 pass through the tank 22, or at the locations where the inlet end 62 and the outlet end 63 of the heat exchange tube 60 pass through the tank 22, to ensure overall airtightness. Specifically, the inlet pipe 71 and the outlet pipe 72 are both located at the same end of the base plate 21, facilitating connection to the liquid cooling unit and ensuring the integrity of the refrigerant circulation within the internal heat exchange tube 60.

[0047] In at least one embodiment, by providing an inlet pipe 71 and an outlet pipe 72 on the base plate 21, it is easy to connect to the liquid cooling unit. At the same time, by connecting the inlet pipe 71 and the outlet pipe 72 to the inlet end 62 and the outlet end 63 of the heat exchange tube 60 respectively, the liquid cooling unit drives the refrigerant to flow from the inlet pipe 71 into the heat exchange tube 60 and flow back to the liquid cooling unit from the outlet pipe 72, ensuring complete refrigerant circulation and heat exchange within the heat exchange tube 60. Furthermore, by independently setting the inlet pipe 71 and the outlet pipe 72 outside the tank 22, the high-efficiency heat exchange characteristics of the semi-immersion liquid cooling are retained, effectively improving heat exchange efficiency and maintaining the temperature uniformity inside the battery pack, while also providing convenient conditions for subsequent maintenance or pipe replacement.

[0048] Optionally, such as Figure 1 , Figures 5 to 8 As shown, the outer wall of the heat exchange tube 60 is provided with fins 62.

[0049] In some embodiments, fins 61 refer to sheet-like structures attached to the outer wall of the heat exchange tube 60. Specifically, they can be implemented using thin metal sheets or corrugated structures, and can be integrally formed with the heat exchange tube 60. These fins increase the contact area between the heat exchange tube 60 and the coolant in the battery module 40 and the tank 22, thereby improving heat transfer efficiency. Specifically, the fins 61 are evenly distributed on the outer wall of the heat exchange tube 60, further improving the uniformity of cooling and heat exchange within the tank 22.

[0050] In at least one embodiment, by providing fins 61 on the outer wall of the heat exchange tube 60, on the one hand, the fins 61 can increase the contact area between the heat exchange tube 60 and the coolant in the tank 22, and can directly contact the battery cells, thereby improving heat exchange efficiency and heat exchange uniformity. On the other hand, the fins 61 are located between two rows of battery cells, that is, the two rows of battery cells sandwich a set of heat exchange tubes 60 and fins 61 between them. The fins 61 can provide a certain degree of support for the two adjacent rows of battery cells, and at the same time, the two adjacent rows of battery cells also fix the heat exchange tubes 60 between them to a certain extent, further improving the overall structural stability and reliability.

[0051] Optionally, such as Figure 1 , Figure 5 refer to Figure 8 As shown, the heat exchange tube 60 is arranged along the length direction of the battery cell module 40, and the heat exchange tube 60 is arranged in an S-shape in the vertical plane.

[0052] In some embodiments, "arranged along the length of the cell module 40" means that the extension path of the heat exchange tube 60 is parallel to the long side axis of the cell module 40. This can be achieved using a straight or continuously bent pipe layout, ensuring that the refrigerant flow direction matches the heat distribution trend of the cell module 40. The vertical plane is the vertical plane between two rows of cells, i.e., as shown... Figure 7 and Figure 8 As shown in the diagram, the S-shaped bend configuration refers to the heat exchange tube 60 forming a continuous wave-shaped structure in the vertical plane between two adjacent rows of cells. Specifically, it can be achieved by connecting multiple U-shaped bending units end to end. By increasing the contact area between the heat exchange tube 60 and the cells and the coolant in the tank 22, the heat transfer efficiency is improved.

[0053] In at least one embodiment, by arranging the heat exchange tube 60 along the length of the battery cell module 40 and making an S-shaped bend in the vertical plane, the S-shaped bend structure of the heat exchange tube 60 extends along the length of the battery cell module 40, covering different height areas of the battery cell module 40 in the vertical direction, thereby improving the uniformity of heat exchange. Furthermore, when the refrigerant flows through the S-shaped bend section, the flow path is extended, and the turbulence effect formed at the bend can enhance the heat exchange with the coolant on the surface of the battery cell and in the tank 22, thereby strengthening the heat dissipation capacity under high power conditions. At the same time, the bend structure optimizes the space utilization of the heat exchange tube 60 in the vertical direction, further improving the heat exchange efficiency.

[0054] Optionally, such as Figure 1 , Figures 5 to 8 As shown, the semi-immersed liquid-cooled battery pack also includes a support rod assembly, the heat exchange tube 60 is connected to the support rod assembly, and the support rod assembly is vertically connected to the mounting structure of the cell module 40 and / or the lower housing 20.

[0055] In some embodiments, the support rod assembly may include multiple support rods for fixing the heat exchange tube 60. The connection method between the heat exchange tube 60 and the support rod assembly may be embedding, clamping, or welding, etc., without specific limitations. The mounting structure of the battery cell module 40 refers to the structure for fixing the battery cell module 40, such as the crossbeam 41. Of course, the mounting structure of the battery cell module 40 may also be other, without specific limitations. The support rod assembly may be connected and fixed to the mounting structure of the battery cell module 40, or connected and fixed to the lower housing 20, or simultaneously connected and fixed to both the mounting structure of the battery cell module 40 and the lower housing 20.

[0056] In at least one embodiment, by setting a support rod assembly and connecting it to the heat exchange tube 60, the stability of the heat exchange tube 60 is further improved, providing further support and fixation. At the same time, by vertically connecting the support rod assembly to the mounting structure of the cell module 40 and / or the lower housing 20, on the one hand, space of the cell module 40 is saved and energy density is increased; on the other hand, it facilitates the overall installation of the heat exchange tube 60 and the support rod assembly. For example, the support rod assembly can be inserted as a whole between two adjacent rows of cells in the cell module 40. When installing and replacing components, the heat exchange tube 60 can also be quickly disassembled and assembled as a whole through the support rod assembly, improving disassembly and assembly efficiency.

[0057] Optionally, such as Figure 1 , Figures 5 to 8 As shown, the support rod assembly includes a first support rod 81 and a second support rod 82. The first support rod 81 and the second support rod 82 are respectively connected to the two ends of the heat exchange tube 60 along its length, and the water inlet 62 and the water outlet 63 of the heat exchange tube 60 are both embedded in the second support rod 82.

[0058] In some embodiments, multiple first support rods 81 are located at the same end along the length of the cell module 40, and multiple second support rods 82 are located at the other end. That is, the inlet end 62 and outlet end 63 of multiple heat exchange tubes 60 are both located at the same end of the cell module 40, which facilitates integration and connection and improves circulation efficiency. Specifically, crossbeams 41 are respectively provided at both ends along the length of the cell module 40. The bottoms of the first support rods 81 and the second support rods 82 are respectively provided with snap-fit ​​notches that match the crossbeams 41. At the same time, the first support rods 81 and the second support rods 82 are respectively provided with connecting holes 841 along their length. During installation, screws 84 pass through the connecting holes 841 and connect to the crossbeams 41 to ensure the stability and firmness of the structure. In addition, the top of the connecting hole 841 is set as a countersunk hole structure to prevent the top of the screw 84 from hitting the seal 30 and affecting the sealing performance of the coolant in the tank 22. The structure is more reasonable and reliable.

[0059] In at least one embodiment, by connecting a first support rod 81 and a second support rod 82 to both ends of the heat exchange tube 60 along its length, the heat exchange tube 60 can be effectively supported and fixed. At the same time, by embedding both the water inlet end 62 and the water outlet end 63 of the heat exchange tube 60 within the second support rod 82, the installation space requirement for external pipelines is eliminated. Furthermore, the structural strength of the second support rod 82 itself provides double fixation, preventing pipeline loosening due to vibration, and further improving the stability and sealing reliability of the overall structure. Moreover, since the water inlet end 62 and the water outlet end 63 of the heat exchange tube 60 are located at the same end, it facilitates the integrated connection of the pipelines.

[0060] Optionally, such as Figure 1 , Figures 5 to 8 As shown, the support rod assembly also includes a third support rod 83, which is connected to the middle part of the heat exchange tube 60 along its length.

[0061] In some embodiments, in the vertical direction, the heights of the first support rod 81, the second support rod 82, and the third support rod 83 are all greater than the height of the heat exchange tube 60. That is, the first support rod 81, the second support rod 82, and the third support rod 83 can effectively support and fix each segment of the S-shaped bend structure of the heat exchange tube 60. It should be noted, however, that the heights of the first support rod 81, the second support rod 82, and the third support rod 83 are less than the installation height of the sealing element 30, so as not to affect the seal.

[0062] In at least one embodiment, by connecting a third support rod 83 at the middle of the length of the heat exchange tube 60, and arranging an S-shaped bend in the heat exchange tube 60 between two adjacent rows of cells inside the cell module 40, the support rod assembly is fixed to both ends of the heat exchange tube 60 by the first support rod 81 and the second support rod 82 respectively, while the third support rod 83 is located in the middle region of the heat exchange tube 60. When the refrigerant flows in the heat exchange tube 60, the third support rod 83 applies a vertical constraint force to the middle of the heat exchange tube 60, suppressing the lateral displacement of the heat exchange tube 60 caused by gravity or the impact of refrigerant flow, so that the outer wall fins 61 of the heat exchange tube 60 maintain a stable contact state with the surface of the cell, and at the same time avoids structural fatigue caused by stress concentration at the bend of the heat exchange tube 60, further improving the overall structural stability and reliability.

[0063] In addition, one or more embodiments of this application provide an energy storage device, including the semi-immersed liquid-cooled battery pack described above.

[0064] In some embodiments, the energy storage device is an energy storage cabinet or an energy storage box.

[0065] In at least one embodiment, the energy storage device described in this application has the same advantages over the prior art as the semi-immersed liquid-cooled battery pack, and combining the semi-immersed liquid-cooled battery pack with the corresponding energy storage device is a common technical means that should be understood by those skilled in the art, and will not be described in detail here.

[0066] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A semi-immersed liquid-cooled battery pack, characterized in that, The device includes an upper cover, a lower housing, a sealing element, a battery cell module, and heat exchange tubes. The upper cover covers the lower housing. The lower housing includes a bottom plate and a groove. The groove has a receiving slot and is disposed on the bottom plate. The battery cell module is disposed in the groove. The sealing element is connected between the groove wall of the groove and the battery cell module and forms a gap with the bottom plate to seal the coolant contained in the groove. The heat exchange tubes are disposed between two adjacent rows of battery cells in the battery cell module and are used to connect to a liquid cooling unit.

2. The semi-immersed liquid-cooled battery pack according to claim 1, characterized in that, The semi-immersed liquid-cooled battery pack also includes an inlet pipe and an outlet pipe connected to the liquid cooling unit, respectively. The inlet pipe and the outlet pipe are connected to the inlet end and the outlet end of the heat exchange tube, respectively. The inlet pipe and the outlet pipe are respectively disposed on the bottom plate and are both located outside the tank.

3. The semi-immersed liquid-cooled battery pack according to claim 1, characterized in that, The outer wall of the heat exchange tube is provided with fins.

4. The semi-immersed liquid-cooled battery pack according to claim 1, characterized in that, The heat exchange tube is arranged along the length of the battery cell module, and the heat exchange tube is arranged in an S-shape in the vertical plane.

5. The semi-immersed liquid-cooled battery pack according to claim 4, characterized in that, The semi-immersed liquid-cooled battery pack also includes a support rod assembly, the heat exchange tube is connected to the support rod assembly, and the support rod assembly is vertically connected to the mounting structure of the cell module and / or the lower casing.

6. The semi-immersed liquid-cooled battery pack according to claim 5, characterized in that, The support rod assembly includes a first support rod and a second support rod, which are respectively connected to the two ends of the heat exchange tube along its length, and the inlet and outlet ends of the heat exchange tube are both embedded in the second support rod.

7. The semi-immersed liquid-cooled battery pack according to claim 6, characterized in that, The support rod assembly also includes a third support rod, which is connected to the middle part of the heat exchange tube along its length.

8. The semi-immersed liquid-cooled battery pack according to claim 1, characterized in that, The semi-immersed liquid-cooled battery pack also includes an electrical auxiliary component electrically connected to the cell module. The electrical auxiliary component is disposed on the base plate and located outside the tank.

9. The semi-immersed liquid-cooled battery pack according to claim 1, characterized in that, The seal is located at 75% to 85% of the height of the battery cell in the battery cell module.

10. An energy storage device, characterized in that, Including the semi-immersed liquid-cooled battery pack as described in any one of claims 1-9.

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