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 and a battery cell module. 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 provided with a containing groove. The groove body is arranged on the bottom plate. The battery cell module is arranged in the groove body. The groove bottom of the groove body is in a concave-convex plate structure. The sealing element is connected between the groove wall of the groove body and the battery cell module and forms a spacing with the bottom plate, so as to seal the cooling liquid contained in the groove body. The cooling liquid does not need to be repeatedly charged and discharged, the cost is saved, and the maintenance and repair are convenient, thereby saving the maintenance and repair cost. In addition, the groove bottom of the groove body is arranged in a concave-convex plate structure, that is, the plate part bearing the battery cell module is in a concave-convex plate structure, so that the bottom of the battery cell module can be in contact with the cooling liquid to a greater extent, and the heat exchange efficiency is improved.

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] With the global energy transition and the advancement of "dual-carbon" goals, lithium-ion batteries, due to their high energy density and long cycle life, have become a core energy component in electrical equipment such as new energy vehicles and energy storage systems. Battery packs generate a large amount of heat during charging and discharging, and their operating temperature directly affects performance, lifespan, and safety; therefore, efficient thermal management technology is crucial. Currently, immersion liquid cooling technology, which enables direct contact between the battery and the coolant and eliminates contact thermal resistance, demonstrates significant advantages in improving heat exchange efficiency and suppressing the spread of thermal runaway, and is therefore widely researched and applied.

[0003] However, in related technologies, fully submerged liquid-cooled battery packs require a large amount of coolant to cover all components, resulting in high costs. Furthermore, the coolant needs to be released for repairs of vulnerable components after immersion, further increasing maintenance costs. At the same time, the traditional cell module layout limits the contact area with the coolant, leading to heat accumulation and low heat exchange efficiency, which restricts the full utilization of battery performance. 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 while saving costs.

[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, and a cell module. The upper cover covers the lower housing, and the lower housing includes a bottom plate and a groove. The groove has a receiving groove and is disposed on the bottom plate. The cell module is disposed in the groove, and the bottom of the groove has a concave-convex plate structure. 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.

[0006] 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.

[0007] Optionally, the seal is located at a height position of 75% to 85% of the cell of the cell module.

[0008] Optionally, the seal is an elastic structure, and the seal is compressed between the tank wall plate of the tank and the battery module.

[0009] Optionally, the sealing element is a frame body that is adapted to the shape of the groove of the groove body, and a partition strip is provided in the frame body along the cell arrangement direction of the cell module, and the partition strip is compressed between two adjacent rows of cells.

[0010] Optionally, the seal is a one-piece molded rubber cotton.

[0011] Optionally, the bottom of the tank is provided with a plurality of protrusions to form a concave-convex plate structure, the battery cell module is disposed on the protrusions, and the relative concave areas between the plurality of protrusions form the flow channels of the coolant.

[0012] Optionally, the plurality of protrusions are spaced apart along the cell arrangement direction of the cell module, and the bottom four corners of one cell of the cell module respectively overlap the four corresponding protrusions.

[0013] 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, into which battery cell modules are installed and filled with 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 on top of the seal, 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... Operations such as inspection and maintenance of the top of the battery cell module, such as the terminal posts, are performed. Other components that require frequent maintenance and repair can be installed on the base plate, and the lower housing is completely covered by the upper cover to achieve 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, saving costs and facilitating maintenance and repair. At the same time, by setting the bottom of the tank to a concave-convex plate structure, that is, the plate supporting the battery cell module is a concave-convex plate structure, the bottom of the battery cell module can have a greater contact with the coolant, improving heat exchange efficiency.

[0014] In addition, one or more embodiments of this application provide an energy storage device, including the semi-immersed liquid-cooled battery pack described above.

[0015] 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

[0016] 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.

[0017] 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 schematic diagram of the main structure of the box in an embodiment of this application; Figure 3 This is a three-dimensional structural diagram of the sealing element according to an embodiment of this application; Figure 4 This is a top view of the box structure in an embodiment of this application; Figure 5 This is a three-dimensional structural diagram of the box in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 10-Upper cover, 20-Lower housing, 21-Bottom plate, 211-Boss, 22-Tunnel, 30-Seal, 31-Separator strip, 40-Cell module, 41-Cell cell, 50-Electrical auxiliary components, 51-Electrical control components, 52-Fuse assembly, 53-High voltage plug-in assembly, X-Cell arrangement direction. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] like Figure 1 As shown, the semi-immersed liquid-cooled battery pack includes an upper cover 10, a lower housing 20, a sealing element 30, and a cell module 40. 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, and the bottom of the groove 22 has a concave-convex plate structure. 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.

[0029] In some embodiments, the semi-immersed liquid-cooled battery pack is rectangular in shape, that is, the upper cover 10 is a rectangular structure. It can be extended downward through the four sides of the upper cover 10 to form a cover structure, or it can be extended upward through the four sides of the lower box 20 to seal and connect with the upper cover 10. The bottom plate 21 is a rectangular plate, and the groove 22 is a rectangular groove. Meanwhile, the cell module 40 is a matrix structure formed by multiple cells connected in series or in parallel, and the whole is also a rectangular structure. The structure is more regular and easy to install as a whole. The tank 22 can be integrally formed with the base plate 21, meaning that the bottom of the tank 22 is part of the base plate 21. The tank 22 is a top-opening tank structure, or it can be set on the base plate 21 through a four-sided surrounding plate structure to form a tank structure. The concave-convex plate structure is a continuous protrusion and depression structure on the plate. It can be formed by the bottom of the tank 22 or the base plate 21 protruding upwards, or by the bottom being recessed downwards, or by both protruding upwards and recessing downwards simultaneously. On the one hand, it can improve the structural strength of the plate used to support the battery cell module 40. On the other hand, by supporting the bottom of the battery cell module 40 with the protrusion, the recessed part forms a flow channel for the coolant. This not only increases the contact area between the bottom of the battery cell module 40 and the coolant, but also improves the fluidity of the coolant in the tank 22, further improving the overall heat exchange efficiency.

[0030] 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. By providing a seal 30 between the tank wall of the tank 22 and the battery cell module 40, the coolant is sealed only within the tank housing the battery cell module 40. Simultaneously, the top of the battery cell module 40, such as the terminal post, can be placed above the seal 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... Furthermore, it facilitates the inspection and maintenance of the top of the battery cell module 40, such as the terminal posts. Other components that require frequent maintenance and repair can be installed on the base plate 21, and the lower housing 20 is completely covered by the upper cover 10, achieving a stable and sealed overall structure. When it is necessary to maintain and repair components other than the battery cell module 40, it is only necessary to open the upper cover 10, without having to repeatedly fill and drain the coolant, saving costs and facilitating maintenance and repair. At the same time, by setting the bottom of the tank 22 as a concave-convex plate structure, that is, the plate supporting the battery cell module 40 is a concave-convex plate structure, the bottom of the battery cell module 40 can have a greater contact with the coolant, improving heat exchange efficiency.

[0031] Optionally, such as Figure 1 , Figure 2 and Figure 4 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.

[0032] 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.

[0033] 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.

[0034] Optionally, such as Figure 1 and Figure 2 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.

[0035] 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.

[0036] 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.

[0037] Optionally, such as Figure 1 and Figure 3 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.

[0038] 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.

[0039] 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 and Figure 3 and Figure 4As shown, the sealing member 30 is a frame body that is adapted to the groove shape of the groove body 22, and a partition strip 31 is provided in the frame body along the cell arrangement direction X of the cell module 40, and the partition strip 31 is compressed between two adjacent rows of cells.

[0040] In some embodiments, the sealing element 30 is a rectangular frame, which 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, thus forming a continuous sealing interface at the edge of the groove. For example, Figure 4 As 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.

[0041] In at least one embodiment, by setting the sealing element 30 as a frame body adapted to the slot opening of the tank 22, and providing a separator strip 31 along the cell arrangement direction X inside the frame, with the separator strip 31 compressed between adjacent cells, when the cell module 40 is installed into the tank 22, the frame body is pressed between the edge of the slot opening and the top of the cell module 40. Its outer edge is tightly fitted to the tank 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, avoiding 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.

[0042] Optionally, such as Figure 1 and Figure 3 As shown, the sealing element 30 is an integrally molded rubber cotton.

[0043] 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.

[0044] Optionally, such as Figure 1 , Figure 4 and Figure 5 As shown, the bottom of the tank 22 is provided with a plurality of protrusions 211 to form a concave-convex plate structure. The battery cell module 40 is disposed on the protrusions 211, and the relative concave areas between the plurality of protrusions 211 form the flow channels of the coolant.

[0045] In some embodiments, the bottom of the tank 22 is also part of the base plate 21. That is, four plates are vertically arranged on the base plate 21 and enclose the tank 22. The boss 211 refers to the support structure provided at the bottom of the tank 22. Specifically, it can be implemented by regularly arranged block-shaped or strip-shaped protrusions, which are used to lift the battery cell module 40 on the bottom plane of the tank, so that the bottom of the battery cell forms a contact space with the coolant. The relatively recessed area refers to the gap naturally formed between adjacent bosses 211. Specifically, it can be implemented by controlling the spacing and height difference of the bosses 211, which is used to construct a continuous coolant flow path, guide the liquid to directional circulation, and further improve the heat exchange efficiency.

[0046] In at least one embodiment, a boss 211 is provided at the bottom of the tank 22, and the battery cell module 40 is disposed on the boss 211. At the same time, the relatively recessed areas between adjacent bosses 211 form cooling channels. That is, the bottom of the battery cell module 40 is located above both the boss 211 and the cooling channels, so that a suspended area is formed between the bottom of the battery cell and the bottom of the tank. The coolant can flow below the suspended area, that is, in the cooling channels, and the battery cell and the coolant can form multi-faceted contact. The cooling channels guide the flow of coolant, enhance the convective heat transfer effect, and prevent heat from accumulating at the bottom of the battery cell.

[0047] Optionally, such as Figure 1 , Figure 4 and Figure 5 As shown, multiple protrusions 211 are spaced apart along the cell arrangement direction X of the cell module 40, and the bottom four corners of one cell of the cell module 40 respectively overlap the four corresponding protrusions 211.

[0048] In some embodiments, the arrangement of protrusions 211 at intervals along the cell arrangement direction (X) means that the protrusions 211 are arranged at intervals along the cell arrangement direction. Specifically, this can be achieved by machining multiple independent protrusion structures on the bottom of the tank 22. For example, as shown in the figure, the protrusions 211 are stamped on the bottom plate 21 corresponding to the bottom of the tank 22. This design forms a recessed area between adjacent protrusions 211, which serves as a flow channel for the coolant. The four corners of the bottom of the cell 41 overlapping the four protrusions 211 means that the four corner areas of a single cell 41 are in contact with four independent protrusions 211 respectively. This can be achieved by adjusting the position of the protrusions 211 to align with the corners of the cell. This design distributes the weight load of the cell through multi-point support, while reducing the contact area between the bottom of the cell and the protrusions 211, thus improving both structural stability and heat exchange efficiency. In at least one embodiment, by arranging the bosses 211 at intervals along the cell arrangement direction X, and having the four corners of the cell bottom overlap with the corresponding bosses 211, the recessed areas between adjacent bosses form continuous coolant flow channels, allowing the coolant to flow directionally along the cell arrangement direction X, thereby enhancing the circulation capacity of the coolant in the gaps between the cells. Furthermore, when the four corners of the cell bottom overlap with the four bosses 211, the cell only contacts the bosses 211 through its corner areas, while the remaining area of ​​its bottom directly contacts the coolant, thereby expanding the heat exchange area between the cell bottom and the coolant. The spacing of the bosses 211 and the overlapping structure at the four corners work together to maintain the installation stability of the cell module 40 and avoid obstructing the flow of coolant due to large-area contact, thus improving the heat exchange efficiency. Optionally, such as Figure 1 , Figure 4 and Figure 5 As shown, the corners of the boss 211 are rounded.

[0049] In some embodiments, the rounded corner structure refers to the rounded transition of the corners of the boss 211, which can be achieved by machining or mold forming processes. The radius of the rounded corner can be adjusted according to the size of the battery cell module 40 and the installation requirements. This structure eliminates sharp edges and corners, making the contact area between the bottom of the battery cell module 40 and the boss 211 form a smooth transition, thereby dispersing contact stress.

[0050] In at least one embodiment, by setting the corners of the boss 211 to a rounded corner structure, during the installation of the battery cell module 40, the rounded corner structure can avoid hard contact between sharp corners and the bottom of the battery cell, reduce the risk of local stress concentration, and prevent damage to the battery cell module 40. At the same time, the rounded corner structure reduces turbulence and flow resistance when the coolant flows through the corners of the boss 211, promoting uniform distribution of coolant in the flow channel. In addition, the rounded corner structure can reduce the generation of burrs or edge defects during processing, improving the surface quality of the boss.

[0051] In addition, one or more embodiments of this application provide an energy storage device, including the semi-immersed liquid-cooled battery pack described above.

[0052] In some embodiments, the energy storage device is an energy storage cabinet or an energy storage box.

[0053] 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.

[0054] 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, and a battery cell module. 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, and the bottom of the groove has a concave-convex plate structure. 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.

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 electrical auxiliary component electrically connected to the cell module. The electrical auxiliary component is disposed on the base plate and located outside the tank.

3. 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.

4. The semi-immersed liquid-cooled battery pack according to claim 1, characterized in that, The seal is an elastic structure, and the seal is compressed between the tank wall plate of the tank body and the battery cell module.

5. The semi-immersed liquid-cooled battery pack according to claim 4, characterized in that, The sealing element is a frame body adapted to the shape of the groove of the groove body, and a partition strip is provided in the frame body along the cell arrangement direction of the cell module, and the partition strip is compressed between two adjacent rows of cells.

6. The semi-immersed liquid-cooled battery pack according to claim 4 or 5, characterized in that, The sealing element is a one-piece molded rubber cotton.

7. The semi-immersed liquid-cooled battery pack according to claim 1, characterized in that, The bottom of the tank is provided with several protrusions to form a concave-convex plate structure. The battery cell module is disposed on the protrusions, and the relative concave areas between the multiple protrusions form the flow channels of the coolant.

8. The semi-immersed liquid-cooled battery pack according to claim 7, characterized in that, The plurality of protrusions are spaced apart along the cell arrangement direction of the cell module, and the bottom four corners of one cell of the cell module respectively overlap the four corresponding protrusions.

9. The semi-immersed liquid-cooled battery pack according to claim 8, characterized in that, The corners of the boss are rounded.

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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