Buffer type end plate assembly, battery box body and battery module

Abstract

The utility model provides a buffer type end plate assembly, a battery box body and a battery module. The buffering type end plate assembly comprises an end plate structure, the end plate structure comprises a connecting part (1) and a buffering part (2), the buffering part (2) is connected with the connecting part (1) and located on the inner side of the connecting part (1), a connecting structure is arranged on the connecting part (1), and the buffering part (2) is provided with a buffering cavity (21). According to the buffer type end plate assembly disclosed by the utility model, the damage to the end plate caused by the expansion force of the battery cell can be effectively relieved, and the stability and the safety of a battery module are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular, to a buffer end plate assembly, a battery box body and a battery module. Background Art

[0002] A battery module is a combined structure composed of multiple battery cells, and is usually used to store and supply electrical energy to equipment. The battery module can be assembled and customized according to different requirements and application scenarios to achieve different voltage, capacity and power outputs. It generally includes components such as battery cells, a battery management system (BMS), a housing, and connectors, and can be conveniently installed and replaced. The battery module is widely used in fields such as electric vehicles, energy storage systems, and drones, and is an indispensable part of modern power systems.

[0003] A battery module generally includes components such as battery cores, connectors, protection boards, and box bodies. A common method is to connect multiple battery cores in series or in parallel to provide higher voltage and capacity outputs. Multiple battery cores are arranged in the box body and fixed by end plates.

[0004] As the number of cycles of the battery cores increases, more heat is generated inside the battery module, which causes the expansion force of the battery cores to gradually increase. Since the battery cores are fixed by end plates at both ends of the battery module, the expansion space of the battery cores is restricted and the expansion force cannot be fully released. When the battery cores enter the end stage of the cycle, it is easy to cause risks such as the end plates cracking and the fixing tie rods of the end plates loosening or breaking. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide a buffer end plate assembly, a battery box body and a battery module, which can effectively relieve the damage of the expansion force of the battery cores to the end plates and improve the stability and safety of the battery module.

[0006] To achieve the above purpose, according to one aspect of the utility model, a buffer end plate assembly is provided, which includes an end plate structure. The end plate structure includes a connecting portion and a buffer portion. The buffer portion is connected to the connecting portion and is located inside the connecting portion. A connecting structure is provided on the connecting portion, and the buffer portion has a buffer cavity.

[0007] Further, the connecting portion includes two first side plates arranged oppositely and an intermediate connecting plate connected between the two first side plates and located on the side of the first side plates close to the buffer portion. A fixed connecting frame is provided on the side of the intermediate connecting plate facing away from the buffer portion, and a tie rod fixing hole is provided on the fixed connecting frame.

[0008] Further, the fixed connecting frame includes a horizontal rib, a vertical rib, and an inclined rib. The horizontal rib is located outside the middle connecting plate and is spaced from the middle connecting plate. There are multiple vertical ribs, which are spaced between the middle connecting plate and the horizontal rib and divide the space between the middle connecting plate and the horizontal rib into multiple rectangular frames. At least one inclined rib is diagonally connected to each rectangular frame.

[0009] Further, the tie rod fixing holes are provided at the intersection positions of the two ends of the horizontal rib and the vertical rib.

[0010] Further, the buffer portion includes two relatively arranged second side plates and an inner connecting plate connected between the two second side plates. The inner connecting plate is located on the side of the second side plate away from the connecting portion, and the two second side plates are fixedly connected to the connecting portion.

[0011] Further, the second side plate is located in the extending direction of the first side plate and is an integral structure with the first side plate. The second side plate, the middle connecting plate, and the inner connecting plate enclose a hollow buffer cavity.

[0012] Further, a concave structure is formed in the middle of the inner connecting plate and is recessed towards the connecting portion.

[0013] Further, a buffer layer is provided on the side of the buffer portion away from the connecting portion, and the side of the buffer layer away from the buffer portion is a planar structure.

[0014] Further, the surface of the buffer layer facing the buffer portion is adapted to the surface of the buffer portion facing the buffer layer, and the buffer layer and the buffer portion are in surface contact at the mating position.

[0015] Further, the buffer layer includes a foam or a rubber pad, and the buffer layer is fixedly bonded to the buffer portion.

[0016] According to another aspect of the present invention, a battery box body is provided, which includes a housing and the above-mentioned buffer end plate assembly, and the buffer end plate assembly is fixedly arranged in the housing.

[0017] According to another aspect of the present invention, a battery module is provided, which includes the above-mentioned buffer end plate assembly.

[0018] Applying the technical solution of the present utility model, the buffer end plate assembly includes an end plate structure, the end plate structure includes a connecting portion and a buffer portion, the buffer portion is connected to the connecting portion and is located inside the connecting portion, a connecting structure is provided on the connecting portion, and the buffer portion has a buffer cavity. This buffer end plate assembly includes a connecting portion and a buffer portion, and the buffer portion includes a buffer cavity. The installation and fixation of the buffer end plate assembly can be realized by using the connecting portion, and the installation and cooperation with the battery cell can be realized by using the buffer portion. Due to the existence of the buffer cavity, when the battery cell expands at the end of the cycle, the expansion space can be released by squeezing the buffer cavity, thereby ensuring that the fixed position of the end plate does not shift or loosen, effectively alleviating the damage of the battery cell expansion force to the end plate, and improving the stability and safety of the battery module. The structure of this buffer end plate assembly is simple and compact, with clear functional distinctions and is easy to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The schematic drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0020] Figure 1 The three-dimensional structure diagram of the buffer end plate assembly according to the embodiment of the present utility model is shown;

[0021] Figure 2 The top view structure diagram of the buffer end plate assembly according to the embodiment of the present utility model is shown;

[0022] Figure 3 The three-dimensional structure diagram of the end plate structure of the buffer end plate assembly according to the embodiment of the present utility model is shown;

[0023] Figure 4 The top view structure diagram of the end plate structure of the buffer end plate assembly according to the embodiment of the present utility model is shown; and

[0024] Figure 5 The three-dimensional structure diagram of the buffer layer of the buffer end plate assembly according to the embodiment of the present utility model is shown.

[0025] Among them, the above-mentioned drawings include the following reference numerals:

[0026] 1. Connecting portion; 11. First side plate; 12. Intermediate connecting plate; 13. Fixed connecting frame; 131. Horizontal rib; 132. Vertical rib; 133. Inclined rib; 14. Pull rod fixing hole; 2. Buffer portion; 21. Buffer cavity; 22. Second side plate; 23. Inner connecting plate; 3. Buffer layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will describe the present utility model in detail with reference to the drawings and in conjunction with the embodiments.

[0028] Referring to Figures 1 to 5 As shown, according to an embodiment of the present utility model, the buffer end plate assembly includes an end plate structure. The end plate structure includes a connecting portion 1 and a buffer portion 2. The buffer portion 2 is connected to the connecting portion 1 and is located inside the connecting portion 1. A connecting structure is provided on the connecting portion 1, and the buffer portion 2 has a buffer cavity 21.

[0029] This buffer end plate assembly includes a connecting portion 1 and a buffer portion 2. The buffer portion 2 includes a buffer cavity 21. The installation and fixation of the buffer end plate assembly can be achieved by using the connecting portion 1, and the installation cooperation with the battery cell can be achieved by using the buffer portion 2. Due to the existence of the buffer cavity 21, when the battery cell expands at the end of the cycle, the expansion space can be released by squeezing the buffer cavity 21, so as to ensure that the fixed position of the end plate does not shift or loosen, effectively alleviating the damage of the battery cell expansion force to the end plate, and improving the stability and safety of the battery module. The structure of this buffer end plate assembly is simple and compact, with clear functional distinctions, and is easy to process.

[0030] In one embodiment, the connecting portion 1 includes two first side plates 11 arranged oppositely, and an intermediate connecting plate 12 connected between the two first side plates 11 and located on the side of the first side plates 11 close to the buffer portion 2. A fixed connecting frame 13 is provided on the side of the intermediate connecting plate 12 facing away from the buffer portion 2, and a pull rod fixing hole 14 is provided on the fixed connecting frame 13.

[0031] In this embodiment, the two first side plates 11 are arranged oppositely, the intermediate connecting plate 12 is connected between the two first side plates 11, and the fixed connecting frame 13 is connected to the side of the intermediate connecting plate 12 facing away from the buffer portion 2, which is convenient for realizing the fixed connection with the housing through the fixed connecting frame 13 on one side of the end plate structure, and realizing the buffer cooperation with the battery cell through the buffer portion 2 on the other side. The structural design is reasonable, which can effectively improve the stability and reliability of the connection structure between the end plate structure and the housing. By providing the pull rod fixing hole 14 on the fixed connecting frame 13, the fixed connection between the end plate structure and the housing can be realized by utilizing the high structural strength of the fixed connecting frame 13, and the deformation of the end plate structure at the connection position with the housing can be effectively prevented.

[0032] In one embodiment, the fixed connecting frame 13 includes a plurality of triangular frame structures, and adjacent triangular frame structures share connecting rib plates, which can not only realize the connection between the plurality of triangular frame structures, but also ensure the reasonable layout of the triangular frame structures. The triangular frame structure has stable structure and good anti-deformation strength, can form a stable connection structure, and effectively ensures the connection stability and reliability between the end plate structure and the housing.

[0033] In one embodiment, both ends of the fixed connection frame 13 are fixedly connected to one end of the first side plate 11 away from the buffer portion 2 through connecting rib plates, which can form a more stable connection structure, so that the strength of the connection portion 1 formed by the fixed connection frame 13, the first side plate 11 and the intermediate connection plate 12 is better.

[0034] In one embodiment, the fixed connection frame 13 includes a horizontal rib 131, vertical ribs 132 and diagonal ribs 133. The horizontal rib 131 is located outside the intermediate connection plate 12 and is arranged at an interval from the intermediate connection plate 12. There are multiple vertical ribs 132, and the multiple vertical ribs 132 are arranged at intervals between the intermediate connection plate 12 and the horizontal rib 131, and the space between the intermediate connection plate 12 and the horizontal rib 131 is divided into multiple rectangular frames, and at least one diagonal rib 133 is connected diagonally to each rectangular frame.

[0035] In this embodiment, by using the cooperation of the horizontal rib 131, vertical ribs 132 and diagonal ribs 133 to form the fixed connection frame 13, multiple triangular connection brackets can be formed by the horizontal rib 131, vertical ribs 132 and diagonal ribs 133, which can ensure that the fixed connection frame 13 has sufficient stiffness and strength and improve the anti-deformation ability of the fixed connection frame 13.

[0036] In one embodiment, the tie rod fixing holes 14 are arranged at the intersection positions of the two ends of the horizontal rib 131 and the vertical ribs 132.

[0037] The reason for arranging the tie rod fixing holes 14 at the intersection position of the horizontal rib 131 and the vertical ribs 132 is that this intersection position has a larger cross-sectional area, which is convenient for setting the tie rod fixing holes 14 and can ensure the structural strength around the tie rod fixing holes 14, avoiding the problem of breakage of the tie rod fixing holes 14 during use.

[0038] In one embodiment, a round rod is arranged at the intersection position of the horizontal rib 131 and the vertical ribs 132. Both the horizontal rib 131 and the vertical ribs 132 are fixedly connected to the round rod, and the tie rod fixing holes 14 are arranged on the round rod. By arranging the round rod, the stability of the fixing structure of the round rod can be ensured by the connection between the horizontal rib 131 and the vertical ribs 132 and the round rod, and the setting of the tie rod fixing holes 14 can be conveniently realized by using the round rod structure. Moreover, the round rod can have a larger cross-sectional area, which can ensure that the side wall of the tie rod fixing hole 14 has sufficient structural strength after the tie rod fixing holes 14 are opened, and more effectively avoid the problem of rupture of the side wall of the tie rod fixing holes 14 during use.

[0039] In one embodiment, the buffer portion 2 includes two relatively arranged second side plates 22 and an inner connection plate 23 connected between the two second side plates 22. The inner connection plate 23 is located on the side of the second side plates 22 away from the connection portion 1, and the two second side plates 22 are fixedly connected to the connection portion 1.

[0040] In this embodiment, the buffer portion 2 includes two relatively arranged second side plates 22. The two second side plates 22 are spaced apart along the direction away from the inner connecting plate 23. The first ends of the two second side plates 22 are fixedly connected to the inner connecting plate 23, and the second ends of the two second side plates 22 are fixedly connected to the intermediate connecting plate 12, thus forming a rectangular or quasi-rectangular structure. Since the two second side plates 22 are spaced apart and the intermediate connecting plate 12 is spaced apart from the inner connecting plate 23, a hollow buffer cavity 21 can be formed between the two second side plates 22, the intermediate connecting plate 12, and the inner connecting plate 23. There is no other structure to support in the middle of the hollow buffer cavity 21, so it has a larger deformation space and can more conveniently absorb the expansion force generated during the expansion of the battery cell.

[0041] In one embodiment, the second side plate 22 is located in the extending direction of the first side plate 11 and is an integral structure with the first side plate 11. The second side plate 22, the intermediate connecting plate 12, and the inner connecting plate 23 enclose a hollow buffer cavity 21.

[0042] In this embodiment, the second side plate 22 is located in the extending direction of the first side plate 11 and forms an integral structure with the first side plate 11, which can improve the structural strength between the second side plate 22 and the first side plate 11. The first side plate 11 and the second side plate 22 can be directly integrally formed. This can not only reduce the processing cost, improve the processing efficiency, and facilitate large-scale production, but also reduce the processing procedures for connecting the first side plate 11 and the second side plate 22, reduce the processing cost, and the integrally formed first side plate 11 and second side plate 22 can have better structural consistency and structural stability.

[0043] In one embodiment, the end plate structure is integrally formed, that is, the connecting portion 1 and the buffer portion 2 are integrally formed, making the integrity of the end plate structure better and the structural strength higher. The end plate structure can be integrally formed by injection molding or can be formed into an integral structure by welding or other means. The specific forming method can be selected according to materials and requirements, etc.

[0044] In one embodiment, a concave structure is formed in the middle of the inner connecting plate 23 and recesses toward the connecting portion 1. A concave structure formed in the middle of the inner connecting plate 23 can form a larger deformation space in the middle of the inner connecting plate 23, so that when the battery cell expands in the middle stage of the cycle, more expansion space can be reserved in the middle part, more expansion deformation force of the battery cell can be absorbed, and a greater expansion buffering effect can be formed.

[0045] In one embodiment, a concave arc structure is formed in the middle of the inner connecting plate 23 and recesses toward the connecting portion 1. The inner connecting plate 23 is an overall arc-shaped plate structure, thus forming a larger deformation space on the side facing the battery cell.

[0046] The concave arc structure of the inner connecting plate 23 allows for more expansion space to be reserved in the middle part when the battery cell expands during the mid-stage of cycling. The buffer cavity 21 of the buffer part 2 enables the battery cell to further release the expansion space by squeezing the buffer cavity 21 when the battery cell expands at the end of the cycle, thus ensuring that the fixed position of the end plate does not shift or become loose.

[0047] In one embodiment, a buffer layer 3 is provided on the side of the buffer part 2 away from the connecting part 1, and the side of the buffer layer 3 away from the buffer part 2 is a planar structure.

[0048] In this embodiment, a buffer layer 3 is provided on the side of the buffer part 2 away from the connecting part 1, and the battery cell is attached to the buffer layer 3. The side of the buffer layer 3 for mounting the battery cell is a planar structure, which can ensure a good matching structure between the buffer layer 3 and the battery cell, facilitate the fixed installation of the battery cell on the buffer layer 3, and effectively ensure the connection strength between the battery cell and the buffer layer 3.

[0049] In one embodiment, the surface of the buffer layer 3 facing the buffer part 2 is adapted to the surface of the buffer part 2 facing the buffer layer 3, and the buffer layer 3 and the buffer part 2 are surface - fitted at the mating position.

[0050] In this embodiment, the outer surface of the buffer layer 3 facing the buffer part 2 is adapted to the inner surface of the buffer part 2 facing the buffer layer 3, so that the outer surface of the buffer layer 3 and the inner surface of the buffer part 2 can form a good fitting effect, ensuring the matching effect between the buffer part 2 and the buffer layer 3, and enabling a more stable and reliable connection and fixing structure to be formed between the buffer part 2 and the buffer layer 3.

[0051] By providing the buffer layer 3 and the buffer cavity 21, the buffer - type end plate assembly can utilize the buffer layer 3 and the buffer cavity 21 to achieve two - stage expansion space release, effectively alleviating the damage of the battery cell expansion force to the end plate fixing points.

[0052] In one embodiment, the buffer layer 3 includes foam or a rubber pad, and the buffer layer 3 is adhesively fixed to the buffer part 2.

[0053] In this embodiment, the buffer layer 3 is foam. The foam is located inside the end plate structure and is adhesively bonded to the battery cell through an adhesive. The side of the foam facing the concave arc surface of the inner connecting plate 23 of the buffer part 2 forms a convex arc surface adapted to the concave arc surface, so that one side of the foam is completely fitted to the concave arc surface of the inner connecting plate 23. The other side of the foam is a planar structure and is completely fitted to the large surface of the battery cell. The foam structure can not only ensure the adhesiveness between the inner connecting plate 23 and the large surface of the battery cell in the early stage of the battery cell cycle, but also enable the battery cell to release the expansion space by compressing the middle part of the foam when the battery cell expands during the mid - stage of the cycle.

[0054] When the battery cell is in the middle stage of the cycle, due to the structure and electrochemical characteristics of the battery cell, the battery cell will bulge in the middle part of the foam under the action of the expansion force. When the battery cell bulges, the middle part of the battery cell protrudes first, and it will preferentially squeeze the middle part of the foam. The foam will contract under the extrusion of the expansion force of the battery cell, absorb the expansion force of the battery cell, and release the expansion space of the battery cell. The buffer cavity 21 of the buffer part 2 of the end plate structure of the present invention is an arc-shaped cavity structure, and the side of the foam connected to the end plate structure is also an arc-shaped convex structure, which can make the two fit completely. Therefore, the buffer type end plate assembly of the present invention enables the middle part of the foam to have sufficient compression space to relieve the expansion force of the battery cell.

[0055] When the battery cell is in the final stage of the cycle, the expansion force of the battery cell further increases. After the foam is completely compressed, it will no longer be able to release the expansion space. Since the buffer cavity 21 of the buffer part 2 of the present invention is an arc-shaped cavity structure, the expansion space can be released secondly by crushing the buffer cavity 21 of the buffer part 2, thereby effectively relieving the damage of the expansion force of the battery cell to the end plate fixing point.

[0056] According to an embodiment of the present invention, the battery box body includes a shell and the above-mentioned buffer type end plate assembly, and the buffer type end plate assembly is fixedly arranged in the shell.

[0057] In this embodiment, a connecting rod is arranged in the shell, and the connecting rod is inserted into the pull rod fixing hole 14 of the buffer type end plate assembly to realize the fixed connection between the shell and the buffer type end plate assembly.

[0058] According to an embodiment of the present invention, the battery module includes the above-mentioned buffer type end plate assembly.

[0059] The present invention has the following advantages:

[0060] 1. The buffer type end plate assembly of the present invention includes a connecting part located on the outside and a buffer part located on the inside. This structure is simple and compact, with clear functional distinctions and is easy to process;

[0061] 2. The fixed connection frame on the outside of the buffer type end plate assembly of the present invention effectively enhances the rigidity and strength of the fixed point through the structure combining vertical ribs and inclined ribs;

[0062] 3. The arc-shaped cavity structure of the buffer part of the buffer type end plate assembly of the present invention and the arc-shaped foam that fits completely with the inside of the buffer part can realize the two-time release of the expansion space, effectively relieving the damage of the expansion force of the battery cell to the end plate fixing point.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0064] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0065] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A buffer end plate assembly, characterized in that, It includes an end plate structure, the end plate structure includes a connecting part (1) and a buffer part (2), the buffer part (2) is connected to the connecting part (1) and is located inside the connecting part (1), a connecting structure is provided on the connecting part (1), and the buffer part (2) has a buffer cavity (21).

2. The buffer end plate assembly according to claim 1, characterized in that, The connecting part (1) includes two first side plates (11) arranged oppositely and an intermediate connecting plate (12) connected between the two first side plates (11) and located on the side of the first side plates (11) close to the buffer part (2). A fixed connecting frame (13) is provided on the side of the intermediate connecting plate (12) facing away from the buffer part (2), and a pull rod fixing hole (14) is provided on the fixed connecting frame (13).

3. The buffer end plate assembly according to claim 2, characterized in that, The fixed connecting frame (13) includes a horizontal rib (131), a vertical rib (132) and an inclined rib (133). The horizontal rib (131) is located outside the intermediate connecting plate (12) and is arranged at an interval from the intermediate connecting plate (12). There are multiple vertical ribs (132), and the multiple vertical ribs (132) are arranged at intervals between the intermediate connecting plate (12) and the horizontal rib (131), and the space between the intermediate connecting plate (12) and the horizontal rib (131) is divided into multiple rectangular frames, and at least one of the inclined ribs (133) is diagonally connected to each rectangular frame.

4. The buffer end plate assembly according to claim 3, characterized in that, The pull rod fixing hole (14) is provided at the intersection position of the two ends of the horizontal rib (131) and the vertical rib (132).

5. The buffer end plate assembly according to any one of claims 2 to 4, characterized in that, The buffer part (2) includes two second side plates (22) arranged oppositely and an inner connecting plate (23) connected between the two second side plates (22). The inner connecting plate (23) is located on the side of the second side plates (22) away from the connecting part (1), and the two second side plates (22) are fixedly connected to the connecting part (1).

6. The buffer end plate assembly according to claim 5, wherein, The second side plate (22) is located in the extending direction of the first side plate (11) and is an integral structure with the first side plate (11). The second side plate (22), the intermediate connecting plate (12) and the inner connecting plate (23) enclose the hollow buffer cavity (21).

7. The buffer end plate assembly according to claim 5, wherein, A concave structure is formed in the middle of the inner connecting plate (23) and is recessed towards the connecting part (1).

8. The buffer end plate assembly according to any one of claims 1 to 4, characterized in that, A buffer layer (3) is provided on the side of the buffer part (2) away from the connecting part (1), and the side of the buffer layer (3) away from the buffer part (2) is a planar structure.

9. The buffer end plate assembly according to claim 8, wherein, The surface of the buffer layer (3) facing the buffer part (2) is adapted to the surface of the buffer part (2) facing the buffer layer (3), and the buffer layer (3) and the buffer part (2) are surface - fitted at the mating position.

10. The buffer end plate assembly according to claim 8, wherein, The buffer layer (3) includes foam or a rubber pad, and the buffer layer (3) is adhesively fixed to the buffer part (2).

11. A battery box body, characterized in that, It includes a housing and the buffer - type end plate assembly according to any one of claims 1 to 10, and the buffer - type end plate assembly is fixedly arranged in the housing.

12. A battery module, characterized in that, It includes the buffer - type end plate assembly according to any one of claims 1 to 10.

Images