Battery end plate, battery module and battery pack

Abstract

The utility model provides a battery end plate, a battery module and a battery pack. The battery end plate comprises a plate body (1), one side of the plate body (1) is provided with an extrusion area (2), a binding area (3) and a variable cross-section area (4) which are sequentially arranged from the middle to the two sides, the height of the variable cross-section area (4) is gradually reduced in the direction away from the binding area (3), and the height of the connecting position of the variable cross-section area (4) and the binding area (3) is smaller than or equal to the height of the extrusion area (2). According to the battery end plate disclosed by the utility model, the problem that the edge of the battery end plate is warped to increase the mounting difficulty of the bandage when the bandage is mounted can be effectively solved, and the stress of the end plate when the bandage is mounted is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery end plate, a battery module, and a battery pack. Background Technology

[0002] With the continuous advancement of energy technology, all-solid-state batteries have gradually become a research hotspot in the battery field due to their advantages such as high energy density, safety, and long lifespan. Compared to traditional liquid lithium-ion batteries, all-solid-state batteries use solid electrolytes instead of flammable liquid electrolytes, greatly improving the overall safety and reliability of the battery. Due to the characteristics of solid electrolytes, solid-state batteries have shown significant advantages in safety, energy density, operating temperature range, and environmental performance, making them an important direction for future battery technology development.

[0003] Traditional battery cell module end plates, whether positive or negative, typically employ a uniform structure and material thickness to provide necessary mechanical support and electrical insulation. However, in solid-state battery modules, due to the special properties and high energy density of the cells, the end plates must not only possess high hardness and high elastic modulus to withstand greater preload, but also consider lightweight design to improve overall energy efficiency.

[0004] During module assembly, binding straps are commonly used to secure the cells and ensure overall structural stability. The installation of these straps requires specialized pressing fixtures to apply pressure to the end plate pressing area, ensuring the straps firmly bind the cell module. During strap installation, the single-thickness end plate, when subjected to the pressure of the pressing fixture, is prone to deformation and warping at both ends due to pressure in the middle. This results in the edge of the end plate being higher than the pressing area, necessitating a greater pressing force to reduce the distance between the two end plates at their edges, thus meeting the strap installation requirements. Excessive pressing force not only increases the difficulty of strap installation but also easily leads to deformation and damage to the end plates, reducing their lifespan. Utility Model Content

[0005] The main purpose of this utility model is to provide a battery end plate, battery module and battery pack, which can effectively improve the problem of edge warping of the battery end plate during installation of the strap, which increases the difficulty of strap installation and reduces the stress on the end plate during strap installation.

[0006] To achieve the above objectives, according to one aspect of the present invention, a battery end plate is provided, including a plate body. One side of the plate body has a compression area, a binding area, and a variable cross-section area arranged sequentially from the middle to both sides. The height of the variable cross-section area gradually decreases along the direction away from the binding area, and the height at the connection position between the variable cross-section area and the binding area is lower than or equal to the height of the compression area.

[0007] Furthermore, the binding area is recessed relative to the compression area and the variable cross-section area, forming a limiting groove.

[0008] Furthermore, the limiting groove is constructed to accommodate the strap, the depth of the limiting groove is D1, the thickness of the strap is H1, and 1 / 6*H1≤D1≤H1.

[0009] Furthermore, 1 / 3*H1≤D1≤2 / 3*H1.

[0010] Furthermore, the variable cross-section region can be an inclined plane, a concave arc surface, or a convex arc surface.

[0011] Furthermore, the height difference between the edge of the variable cross-section region away from the binding region and the height of the extrusion region is H2, and the thickness of the plate in the extrusion region is H3, where 1 / 20*H3≤H2≤1 / 3*H3.

[0012] Furthermore, the angle between the edge of the variable cross-section region from the edge near the binding region to the edge away from the binding region and the extrusion surface of the extrusion region is θ, where 1°≤θ≤45°.

[0013] Furthermore, 5°≤θ≤15°.

[0014] Furthermore, one end of the plate along the length direction is provided with an installation step at the top, and the installation step is provided with a base mounting hole; and / or, the top of both ends of the plate along the length direction are respectively provided with lifting holes.

[0015] Furthermore, an FPC receiving groove is provided on the side of the plate away from the extrusion zone, and the FPC receiving groove extends through the plate along its length.

[0016] Furthermore, the plate is made of carbon fiber.

[0017] According to another aspect of the present invention, a battery module is provided, including stacked battery cells and the aforementioned battery end plate, wherein the battery end plate is disposed on at least one side of the stacked battery cells.

[0018] Furthermore, the battery module also includes straps that are tied to the outside of the individual battery cells and the battery endplate, and the straps are located in the binding area.

[0019] According to another aspect of the present invention, a battery pack is provided, including the battery end plate or the battery module described above.

[0020] By adopting the embodiments of this utility model, a variable cross-section area is formed outside the binding area of ​​the battery end plate, and the height of the variable cross-section area gradually decreases along the direction away from the binding area. This optimizes the structure of the variable cross-section area of ​​the battery end plate, reducing its height. The height of the variable cross-section area decreases further away from the extrusion area. When installing the battery module with straps, the extrusion area needs to be squeezed using tooling. This squeezing force causes the ends of the battery end plate to warp upwards, with the warping height increasing the further away from the extrusion area. This can easily obstruct the installation of the straps. By reducing the height of the variable cross-section area, and by reducing the height of the portion of the variable cross-section area further away from the extrusion area, the warping height of the end plate in the variable cross-section area can be reduced when the extrusion area causes the ends to warp upwards. This reduces the squeezing force required for strap installation, lowers the stress on the end plate during strap installation, reduces the assembly difficulty of the straps, improves assembly efficiency, and effectively prevents damage to the battery end plate due to excessive stress. Since the variable cross-section area is not a primary stress-bearing area, reducing its thickness does not affect the main function of the battery end plate. Furthermore, it reduces the overall weight of the battery end plate, decreasing material usage and cost, achieving lightweighting of the battery end plate and the battery module. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 This is a three-dimensional structural diagram of the battery end plate according to an embodiment of the present utility model;

[0023] Figure 2 This is a three-dimensional structural schematic diagram of the battery end plate from another perspective of an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the battery cell module according to an embodiment of the present invention;

[0025] Figure 4 This is a three-dimensional structural diagram of the battery module according to an embodiment of the present invention.

[0026] The above figures include the following reference numerals:

[0027] 1. Plate; 2. Extrusion zone; 3. Binding zone; 4. Variable cross-section zone; 5. Limiting groove; 6. Binding strap; 7. Base mounting hole; 8. Lifting hole; 9. FPC receiving groove; 10. Individual cell; 11. Mounting step; 12. Base; 13. Heat-conducting shell; 14. Buffer layer; 15. Busbar; 16. Insulating bracket; 17. Cell module. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] See also Figures 1 to 4 As shown, according to an embodiment of the present invention, the battery end plate includes a plate body 1. One side of the plate body 1 has a compression area 2, a binding area 3 and a variable cross-section area 4 arranged sequentially from the middle to both sides. The height of the variable cross-section area 4 gradually decreases along the direction away from the binding area 3. The height of the variable cross-section area 4 at the connection position with the binding area 3 is lower than or equal to the height of the compression area 2.

[0030] In this embodiment, by forming a variable cross-section region 4 outside the binding region 3 of the battery end plate and making the height of the variable cross-section region 4 gradually decrease along the direction away from the binding region 3, the structure of the variable cross-section region 4 of the battery end plate can be optimized, so that the height of the variable cross-section region 4 is reduced, and the further away from the extrusion region 2, the greater the height reduction. When the battery module is fitted with straps, the extrusion area 2 needs to be extruded using a tooling. This extrusion force causes the ends of the battery end plate to warp upwards, with the warping height increasing the further away from the extrusion area 2, potentially hindering strap installation. By reducing the height of the variable cross-section area 4, and by reducing the height of the portion of the variable cross-section area 4 further away from the extrusion area 2, the warping height of the end plate in the variable cross-section area 4 can be reduced when the extrusion area 2 causes the ends to warp upwards. This reduces the extrusion force required for strap installation, lowers the stress on the end plate during strap installation, reduces the assembly difficulty of the straps, improves assembly efficiency, and effectively prevents damage to the battery end plate due to excessive stress. Since the variable cross-section area 4 is not a primary stress-bearing area, reducing its thickness does not affect the main function of the battery end plate. Furthermore, it reduces the overall weight of the battery end plate, decreasing material usage and cost, achieving lightweighting of the battery end plate and the battery module.

[0031] The aforementioned battery endplate can be applied to new energy batteries, especially solid-state batteries.

[0032] In one embodiment, the binding area 3 is recessed relative to the compression area 2 and the variable cross-section area 4 to form a limiting groove 5.

[0033] The binding area 3 is recessed relative to the compression area 2 and the variable cross-section area 4 to form a limiting groove 5. When the binding strap 6 is used to fasten the battery module, the binding strap 6 will be installed in the limiting groove 5 of the binding area 3. The recessed shape of the limiting groove 5 is used to quickly and accurately position the installation position of the binding strap 6, while effectively restricting the lateral movement of the binding strap. This ensures that the binding strap can stably fix the battery cell module while bearing the pre-tension force, thereby avoiding displacement or loosening of the battery cell due to expansion during cyclic charging and discharging. This ensures the stability and safety of the internal structure of the module, while also simplifying the installation process of the binding strap and improving production efficiency.

[0034] In one embodiment, the limiting groove 5 is configured to accommodate the strap 6, the depth of the limiting groove 5 is D1, the thickness of the strap 6 is H1, and 1 / 6*H1≤D1≤H1.

[0035] By limiting the depth of the groove 5 as described above, the groove 5 can be positioned at a suitable depth, which can prevent the groove 5 from being too shallow to effectively limit the displacement of the strap 6, and also prevent the groove 5 from being too deep to affect the structural strength of the battery end plate.

[0036] In one embodiment, 1 / 3*H1≤D1≤2 / 3*H1.

[0037] Limiting the depth of the limiting groove 5 to the range of 1 / 3*H1≤D1≤2 / 3*H1 ensures that the limiting groove 5 has sufficient depth to effectively limit the strap 6. At the same time, further optimizing the maximum depth of the limiting groove 5 ensures that the maximum depth of the limiting groove 5 reduces the impact on the thickness of the battery end plate while maintaining the limiting effect on the strap 6, thus ensuring that the battery end plate still has good structural strength.

[0038] In one embodiment, the variable cross-section region 4 is an inclined plane, a concave arc surface, or a convex arc surface.

[0039] The variable cross-section region 4 can adopt an inclined plane structure, which can reduce the processing difficulty of the variable cross-section region 4 and improve the processing efficiency. This structure is easy to implement and has a low cost.

[0040] The variable cross-section region 4 can also adopt a concave arc surface or an convex arc surface structure, so that the end plate structure of the variable cross-section region 4 has an arc surface structure, which can have better structural performance and achieve greater structural strength with a smaller thickness.

[0041] In one embodiment, the height difference between the edge of the variable cross-section region 4 away from the binding region 3 and the height of the extrusion region 2 is H2, and the thickness of the plate 1 in the extrusion region 2 is H3, where 1 / 20*H3≤H2≤1 / 3*H3.

[0042] In this embodiment, by limiting the height difference between the minimum height of the variable cross-section region 4 and the height of the compression region 2, on the one hand, the minimum value of the height difference between the edge height of the variable cross-section region 4 and the height of the compression region 2 can be limited, so that the height reduction of the variable cross-section region 4 away from the binding region 3 can be significantly reduced, and the upward tilt of the variable cross-section region 4 at the edge position when the compression region 2 is compressed can be avoided. This prevents the upward tilt of the variable cross-section region 4 away from the binding region 3 from being too large due to the small height difference, which would hinder the installation of the binding strap 6. On the other hand, the maximum value of the height difference between the edge height of the variable cross-section region 4 and the height of the compression region 2 can be limited, so that the thickness of the variable cross-section region 4 is too small due to the large height difference, which would affect the structural strength of the variable cross-section region 4 too much and ensure the structural stability of the battery end plate when subjected to the pre-tightening force of the binding strap.

[0043] In one embodiment, the angle between the edge of the variable cross-section region 4 from the edge near the binding region 3 to the edge away from the binding region 3 and the extrusion surface of the extrusion region 2 is θ, where 1°≤θ≤45°.

[0044] By limiting the angle of the variable cross-section area 4 as described above, the tilt angle can be limited within a preset range. This avoids the situation where the tilt angle is too small, which would prevent the height of the variable cross-section area 4 on the side away from the binding area 3 from being reduced, thus failing to effectively reduce the upward lift of the variable cross-section area 4. On the other hand, it avoids the situation where the tilt angle is too large, which would result in the height and thickness of the variable cross-section area on the side away from the binding area 3 being too low, thus excessively affecting the structural strength of the battery end plate of the variable cross-section area 4 and ensuring the structural stability of the battery end plate when subjected to the pre-tightening force of the binding strap.

[0045] In one embodiment, 5°≤θ≤15°.

[0046] By limiting the thickness of the battery end plate in the variable cross-section region 4, it can be ensured that the thickness is within a reasonable range. This can effectively reduce the upward movement of the variable cross-section region 4 when it is compressed in the compression region 2, and also prevent the battery end plate from deforming when subjected to the pre-tightening force of the straps due to the excessive thickness of the variable cross-section region 4, thus ensuring the structural strength and stability of the battery end plate.

[0047] In one embodiment, one end of the plate 1 along the length direction is provided with an upper mounting step 11, and a base mounting hole 7 is provided on the mounting step 11.

[0048] An installation step 11 is designed on the upper part of one end of the plate 1, and a base mounting hole 7 is configured on it. The installation step provides a precise positioning reference, which facilitates the quick alignment and installation of the base 12 and ensures the reliability of the electrical connection. The base mounting hole 7 firmly connects the base 12 to the battery end plate through fasteners and other connection methods, which enhances the stability of the overall structure.

[0049] In one embodiment, the top of each end of the plate 1 along its length is provided with a lifting hole 8.

[0050] Lifting holes 8 are provided at the top of both ends of the plate 1 along its length, providing safe and convenient lifting points for the battery module. During the handling and installation of the module, the lifting equipment can hook the lifting holes 8 to apply force evenly to the battery end plate, avoiding accidental damage to the internal cells or circuits of the module during handling. At the same time, the lifting holes also facilitate the vertical or horizontal installation of the module, ensuring precise alignment during installation.

[0051] In one embodiment, an FPC receiving groove 9 is provided on the side of the plate 1 away from the extrusion area 2, and the FPC receiving groove extends through the plate 1 along the length direction of the plate 1.

[0052] By creating an FPC receiving slot 9 on the board 1 to accommodate the FPC, the portion of the FPC corresponding to the board 1 can be built into the inner side of the board 1. This ensures that the entire structure of the FPC is located inside the battery module, guaranteeing the stability and safety of the FPC within the module and preventing the FPC from being exposed on the outside of the module. This improves the overall appearance and protection level of the module. Forming the FPC receiving slot 9 on the board 1 allows for more efficient use of the board 1's structure, resulting in a more rational FPC layout, reducing the risk of FPC damage due to external environmental factors, and making the module's appearance cleaner and more aesthetically pleasing.

[0053] In one embodiment, plate 1 is a carbon fiber plate.

[0054] The carbon fiber plate 1 utilizes the high strength and high elastic modulus of carbon fiber to ensure that the plate 1 maintains excellent mechanical stability when subjected to the pre-tightening force during battery module assembly and the cyclic stress during long-term use, effectively preventing deformation and extending the service life of the battery module. At the same time, the lightweight carbon fiber plate reduces the overall weight of the battery module and optimizes the energy density. During the expansion or contraction of the battery, the high elasticity and low coefficient of thermal expansion of the carbon fiber plate can effectively absorb internal stress and maintain the consistency and compactness of the module structure.

[0055] See also Figures 1 to 4 As shown, according to an embodiment of the present invention, the battery module includes stacked battery cells 10 and the aforementioned battery end plate, wherein the battery end plate is disposed on at least one side of the stacked battery cells 10.

[0056] In one embodiment, the battery module further includes a strap 6, which is strapped to the outside of the cell 10 and the battery end plate, and the strap 6 is located in the strapping area 3.

[0057] The binding strap 6 is attached to the outside of the individual battery cell 10 and the battery end plate. During the battery charge and discharge cycle, the binding strap 6 can provide appropriate elastic pressure to counteract the internal stress generated by the expansion of the battery cell, maintain close contact between the cells, and optimize the uniformity of the electrochemical reaction. Setting the binding strap 6 within the binding area 3 ensures that the position of the binding strap 6 is more reasonable and provides better binding performance.

[0058] In one embodiment, the battery module further includes an integrated cover plate, which includes an insulating support 16 and a busbar 15 disposed on the insulating support 16. The insulating support 16 is, for example, a plastic support plate, but may also be a support plate made of other insulating materials.

[0059] By designing an integrated cover plate, the assembly process of the battery module can be greatly simplified, production efficiency can be improved, and the safety and stability of electrical connections can be ensured. The bus 15 is integrated on the insulating bracket 16, which allows the assembly of the bus 15 to be carried out simultaneously on the integrated cover plate, improving the degree of modular assembly and assembly efficiency.

[0060] In one embodiment, the insulating bracket 16 includes at least two segments, which are fixedly connected. Adjacent segments can be fixedly connected by means of snap-fit, riveting, or screwing. In another embodiment, adjacent segments are detachably connected.

[0061] In one embodiment, the battery module further includes a heat-conducting housing 13, with a single battery cell 10 installed inside the heat-conducting housing 13. At least one single battery cell 10 and a heat-conducting housing 13 form a battery cell module 17, and a buffer layer 14 is provided between adjacent battery cell modules 17.

[0062] In the structure of the battery module, each battery cell 10 is embedded in a heat-conducting shell 13. The same group of battery cells 10 and heat-conducting shell 13 together constitute a battery cell module 17, and a buffer layer 14 is configured between the modules. The heat-conducting shell 13 can improve the structural strength and heat conduction efficiency of the battery cell, ensuring that the heat energy of the battery cell is effectively conducted and quickly dissipated during charging and discharging. The presence of the buffer layer 14 can absorb the mechanical stress caused by the change in the volume of the battery cell and prevent physical impact between modules. The buffer layer 14 also has a certain heat insulation effect.

[0063] According to an embodiment of the present invention, the battery pack includes the aforementioned battery end plate or the aforementioned battery module.

[0064] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application 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 where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0066] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery end plate, characterized in that, The plate (1) includes a compression zone (2), a binding zone (3) and a variable cross-section zone (4) arranged sequentially from the middle to both sides on one side. The height of the variable cross-section zone (4) gradually decreases along the direction away from the binding zone (3). The height of the variable cross-section zone (4) at the connection position with the binding zone (3) is lower than or equal to the height of the compression zone (2).

2. The battery end plate according to claim 1, characterized in that, The binding area (3) is recessed relative to the compression area (2) and the variable cross-section area (4) to form a limiting groove (5).

3. The battery end plate according to claim 2, characterized in that, The limiting groove (5) is configured to accommodate the strap (6), the depth of the limiting groove (5) is D1, the thickness of the strap (6) is H1, and 1 / 6*H1≤D1≤H1.

4. The battery end plate according to claim 3, characterized in that, 1 / 3*H1≤D1≤2 / 3*H1.

5. The battery end plate according to any one of claims 1 to 4, characterized in that, The variable cross-section region (4) is an inclined plane, a concave arc surface, or a convex arc surface.

6. The battery end plate according to any one of claims 1 to 4, characterized in that, The height difference between the height of the variable cross section (4) on the side away from the binding area (3) and the height of the extrusion area (2) is H2, and the thickness of the plate (1) in the extrusion area (2) is H3, 1 / 20*H3≤H2≤1 / 3*H3.

7. The battery end plate according to any one of claims 1 to 4, characterized in that, The angle between the variable cross section region (4) from the edge near the binding region (3) to the edge away from the binding region (3) relative to the extrusion surface of the extrusion region (2) is θ, where 1°≤θ≤45°.

8. The battery end plate according to claim 7, characterized in that, 5°≤θ≤15°.

9. The battery end plate according to any one of claims 1 to 4, characterized in that, The plate (1) has an installation step (11) at one end along the length direction, and a base mounting hole (7) is provided on the installation step (11); and / or, the plate (1) has a hoisting hole (8) at the top of each end along the length direction.

10. The battery end plate according to any one of claims 1 to 4, characterized in that, An FPC receiving groove (9) is provided on the side of the plate (1) away from the extrusion area (2), and the FPC receiving groove penetrates the plate (1) along the length direction of the plate (1).

11. The battery end plate according to any one of claims 1 to 4, characterized in that, The plate (1) is a carbon fiber plate.

12. A battery module, characterized in that, It includes stacked battery cells (10) and a battery end plate according to any one of claims 1 to 11, the battery end plate being disposed on at least one side of the stacked battery cells (10).

13. The battery module according to claim 12, characterized in that, The battery module also includes a strap (6), which is tied to the outside of the battery cell (10) and the battery end plate, and the strap (6) is located in the binding area (3).

14. A battery pack, characterized in that, Includes the battery end plate according to any one of claims 1 to 11 or the battery module according to claim 12 or 13.

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