A battery cover and a battery

Abstract

This utility model discloses a battery cover and a battery, belonging to the field of battery technology. It includes a cover body with terminal through holes and terminals passing through the terminal through holes in the cover body. It also includes an insulating plate installed above the terminal through holes. The terminals pass through the insulating plate, and each terminal has a first outer edge at its top and a second outer edge at its bottom. The insulating plate and terminals are fixed to the cover body by pressing the first and second outer edges of the terminals together. The cover body and the insulating plate, as well as the insulating plate and the terminals, are connected by an anti-torsion structure. By pressing the first and second outer edges of the terminals together to fix the insulating plate and terminals to the cover body, and by connecting the cover body and the insulating plate, as well as the insulating plate and the terminals, an anti-torsion effect can be achieved for the terminals. The structure is simple and easy to manufacture.

Description

Technical Field

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

[0002] Lithium-ion batteries are widely used in hybrid electric vehicles, electric vehicles, and energy storage due to their advantages such as high energy, high capacity, and high power.

[0003] The basic structure of a lithium battery includes a top cover and electrode terminals set on the top cover. The electrode terminals pass through the top cover and are connected to the battery cell tabs inside the battery. For lithium batteries installed in complex working environments, it is often necessary to ensure that the electrode terminals cannot rotate relative to the cover, otherwise it will cause the battery tabs inside the battery to twist, thus bringing safety hazards. Chinese Patent Application No. 202321999846.1 discloses a top cover assembly, including a top cover plate, a terminal post body, an insulating component, and a connector. The assembly features a recessed portion on the outer periphery of the terminal post, with the insulating component extending towards and filling the recessed portion, thus achieving an anti-rotation effect between the terminal post and the insulating component. The top cover assembly also includes an anti-rotation unit, which includes a protrusion and a first anti-rotation hole. The protrusion is engaged within the first anti-rotation hole. One of the protrusion and the first anti-rotation hole is located on the top cover plate or a first flange, and the other is located on a second connecting portion, achieving an anti-rotation effect between the top cover plate and the connector. Since the connector is connected to the terminal post through the insulating component, the anti-rotation structure effectively prevents rotation between the terminal post and the top cover plate. However, the manufacturing process of this type of top cover is relatively complex, resulting in high production costs. Utility Model Content

[0004] The purpose of this utility model is to provide a battery cover and battery, which solves the problems of complex manufacturing process and high production cost of the top cover structure in the prior art.

[0005] To achieve the above objectives, this utility model provides a battery cover plate, including a cover plate body with a terminal through hole and a terminal that passes through the terminal through hole and penetrates the cover plate body. It also includes an insulating plate installed on the upper part of the terminal through hole. The terminal penetrates the insulating plate, and the top of the terminal is provided with a first outer edge and the bottom is provided with a second outer edge. The insulating plate and the terminal are fixed to the cover plate body by pressing the first and second outer edges of the terminal together. The cover plate body and the insulating plate, as well as the insulating plate and the terminal, are connected by an anti-torsion structure.

[0006] Furthermore, the upper surface of the cover plate body is provided with a first anti-rotation groove outside the terminal through hole; the vertical cross-section of the terminal is approximately "I" shaped, with a column between the first outer edge and the second outer edge; at least a portion of the outer periphery of the insulating plate is recessed in the first anti-rotation groove, and the inner wall of the first anti-rotation groove and the outer periphery of the insulating plate are configured to cooperate with the anti-torsion shape; a column through hole is opened on the insulating plate; the column passes through the column through hole, and the outer wall of the column and the inner wall of the column through hole are configured to cooperate with the anti-torsion shape.

[0007] The insulating plate and the cover plate body are designed to prevent relative rotation by utilizing the anti-rotation shape between the first anti-rotation groove and the insulating plate. Similarly, the terminals and the insulating plate are also designed to prevent relative rotation by utilizing the anti-rotation shape between the outer wall of the column and the inner wall of the column's through-hole. This achieves anti-rotation for the terminals and improves battery safety. Furthermore, by riveting and pressing, the insulating plate and column are fixed to the cover plate body using the first and second outer edges, resulting in a simple process, high production efficiency, and reduced production costs. Moreover, assuming the thickness of each structural component remains constant, the design of the first anti-rotation groove reduces the distance between the upper surface of the first outer edge and the upper surface of the cover plate body. This allows for an increase in the height of the individual battery cells within the limited battery pack space, thereby increasing the internal space and capacity of the individual battery cells and ultimately improving the energy density of the battery pack.

[0008] Furthermore, a second groove is provided on the upper surface of the insulating plate, and the through hole of the column is located in the second groove; a bearing ring is provided in the second groove, and the bearing ring has a hardness greater than that of the insulating plate, which is used to support the first outer edge. Generally speaking, the insulating plate on the battery cover is made of plastic, which has low hardness and weak strength. If the first outer edge is directly pressed onto the insulating plate, it is easy to crush the insulating plate, and it is also difficult to flatten the first outer edge. However, by using a bearing ring with higher hardness to conduct pressure, the possibility of the insulating plate being crushed is reduced, which is conducive to flattening the first outer edge.

[0009] Furthermore, the outer wall of the column is provided with at least one first cut edge to resist torsion, and the inner wall shape of the column through hole is adapted to the outer wall shape of the column. The first cut edge is any notch structure that can prevent the terminal from rotating within the column through hole. Commonly, it is a vertically extending plane formed by cutting off a portion of the column sidewall, rather than an arc surface. This can disrupt the rotational structure of the outer wall of the column. The adaptation of the inner wall of the column through hole to the outer wall shape of the column ensures the realization of the torsion resistance function.

[0010] Furthermore, the outer wall of the first outer edge is provided with a third cutting edge corresponding to the first cutting edge in the vertical direction, and the top of the first cutting edge is connected to the first outer edge.

[0011] Furthermore, the inner wall of the bearing ring is provided with a second tangent that matches the shape of the first tangent. The bearing ring is fitted onto the column, and the anti-torsion effect is achieved through the cooperation of the first and second tangents. In fact, the second tangent is a complementary structure to the first tangent, for example, it is also a vertically extending plane and matches the first tangent. This can prevent the bearing ring from rotating on the column, so as to prevent the bearing ring from deflecting when riveting the first outer edge, thus affecting the smooth flattening of the first outer edge.

[0012] Furthermore, the opening of the first anti-rotation groove can be triangular, quadrilateral, pentagonal, plum blossom-shaped, or other anti-torsion shapes. The shape of the opening of the first anti-rotation groove is designed primarily to prevent the insulating plate from rotating within the groove; therefore, any shape is acceptable as long as it can achieve the anti-torsion function, with quadrilaterals being the most common.

[0013] Furthermore, the distance between the upper surface of the first outer edge and the upper surface of the cover body is 1.5~2.1mm. In currently commercially available lithium batteries, the distance between the upper surface of the terminal and the upper surface of the cover body is generally greater than 2.1mm. This application reduces the distance between the upper surface of the terminal and the upper surface of the cover body by setting the first anti-rotation groove and the second groove, and sinking part of the insulating plate and the bearing ring into the groove. This improves the space utilization and energy density under the premise of limited internal space of the battery pack.

[0014] Furthermore, the bottom of the column is cylindrical and fitted with a sealing ring, which is located between the second outer edge and the cover plate body. The cylindrical shape of the column bottom facilitates the positioning of the sealing ring. Moreover, the height of the cylindrical area at the bottom of the column can be set to be greater than the thickness of the sealing ring.

[0015] Furthermore, a first recessed groove is provided on the lower surface of the cover plate body outside the terminal through hole, and the sealing ring is located in the first recessed groove. The first recessed groove can further utilize the space inside the battery casing, allowing the cell height to be increased, thereby improving space utilization and battery energy density.

[0016] Furthermore, the distance between the lower surface of the second outer edge and the lower surface of the cover body is less than 1.8 mm. The lower surface of the second outer edge using this design is equivalent to the lower surface of the terminal, achieving a distance of less than 1.8 mm from the lower surface of the cover body, thus significantly improving the internal space utilization of the battery.

[0017] Furthermore, a stop frame is provided between the second outer edge and the sink. The upper surface of the stop frame, near the first sink, has an annular first protrusion located within the first sink. A second sink is formed on the lower surface of the first protrusion, and the second outer edge is located within the second sink. This design further utilizes the pressed first and second outer edges to fix the stop frame, sealing ring, insulating plate, bearing ring, and cover plate body together. The annular first protrusion, located within the first sink, serves two purposes: firstly, it allows for positioning of the first protrusion within the sink, and secondly, it improves the internal space utilization of the battery.

[0018] Furthermore, at least one transversely penetrating leak detection channel is provided on the top of the first protrusion. Since no other sealing element is provided between the first protrusion and the first sink, there will be a certain gap between the first protrusion and the first sink due to processing errors. The leak detection channel runs through both the inner and outer sides of the first protrusion. If the sealing ring has a poor sealing effect, the gas inside the battery will be discharged to the outside of the battery through the leak detection channel and the gap between the sealing ring and the cover plate body, which can be easily detected.

[0019] Furthermore, the insulating plate includes a first ring portion, a first connecting portion, and a second ring portion connected sequentially from top to bottom. The bottom of the first ring portion and the first connecting portion are located in a first anti-rotation groove, and the first ring portion and the first connecting portion together form a second groove to protect the bearing ring and the top of the terminal inside. The second ring portion is located in the terminal through hole and can guide and limit the installation of the insulating plate.

[0020] Furthermore, a first step transitions between the first cut edge and the cylindrical area of ​​the column, and the gap between the bottom end of the second ring and the first step is 0~0.2mm. This is to prevent the second ring from contacting the first step, which would result in a large installation error between the insulating plate, the cover plate body, and the terminals, affecting the normal function of the product.

[0021] Furthermore, the column is provided with a second step for supporting the bearing ring, and the second step is flush with the bottom of the second groove. During the riveting process, a large force may be applied to the middle of the bearing ring during the preparation of the first outer edge of the terminal top. Without the support of the second step, the bearing ring may be pressed into a bowl-shaped ring with an inward concave and outward convex shape. The second step can support the inner ring of the bearing ring and prevent its deformation from causing unevenness on the upper surface of the first outer edge.

[0022] Furthermore, in the vertical projection, the outer edge of the first outer edge is located inside the outer edge of the bearing ring, and also within the first anti-rotation groove. The first anti-rotation groove and the bearing ring sequentially support the first outer edge of the terminal, increasing the support strength of the first outer edge and facilitating the processing of a first outer edge with a flat top.

[0023] Furthermore, at least one anti-torsion hole is provided at the bottom of the first anti-rotation groove, and an anti-torsion post is provided on the lower surface of the first connecting part, which is interference-fitted with the anti-torsion hole. During assembly, the anti-torsion post is inserted into the anti-torsion hole to further prevent the insulating plate from rotating relative to the cover plate body.

[0024] Furthermore, both the edge of the anti-torsion hole and the bottom of the anti-torsion post are provided with guide slopes, and the edge anti-torsion post is inserted into the anti-torsion hole.

[0025] Furthermore, the vertical projections of the anti-torsion hole and the anti-torsion post are located on the sealing ring. Since the thickness of the first anti-rotation groove is thinner than other parts of the cover plate body, and the anti-torsion post and the anti-torsion hole are interference-fitted, the middle part of the first anti-torsion groove will be pressed down and deformed during the insertion of the anti-torsion post into the anti-torsion hole. This causes the periphery of the first anti-torsion groove near the terminal through hole to tilt downward, thereby further compressing the sealing ring outside the anti-torsion hole and improving the sealing effect.

[0026] Furthermore, the hardness of the terminal material is lower than that of the bearing ring, and the upper surface of the bearing ring is provided with multiple third anti-rotation grooves; after pressing, some components of the first outer edge, or some tissue, are squeezed into the third anti-rotation grooves, thereby making the first outer edge more firmly bonded to the bearing ring and preventing the first outer edge from rotating.

[0027] Furthermore, the peripheral thickness of the bearing ring is greater than the inner thickness, and the groove depth of the second groove edge is greater than the groove depth near the terminal through hole. The bearing ring is placed in the second groove, and its upper surface remains horizontal. During the riveting process, the outer side of the first outer edge is subjected to greater force. The bearing ring with a larger edge thickness can better support the first outer edge and prevent the edge of the bearing ring from being crushed.

[0028] The present invention also provides a battery, including the battery cover described above.

[0029] It is obvious that the elements or features described in the above individual embodiments can be used alone or in combination in other embodiments.

[0030] This utility model fixes the insulating plate and the terminal to the cover plate body by pressing the first and second outer edges of the terminal, and connects the cover plate body and the insulating plate, as well as the insulating plate and the terminal, through an anti-torsion structure, which can achieve the anti-torsion effect of the terminal and has a simple structure that is easy to process. Furthermore, the riveting and pressing method is simple in process, has high production efficiency, and can achieve the technical effect of reducing production costs. Attached Figure Description

[0031] The dimensions and scales in the accompanying drawings do not represent the dimensions and scales of the actual product. The drawings are for illustrative purposes only, and some non-essential elements or features have been omitted for clarity.

[0032] Figure 1 This is an exploded view of the cover plate in Embodiment 1 of this utility model (the sealing ring is not shown).

[0033] Figure 2 This is a sectional view of the cover plate in Embodiment 1 of this utility model;

[0034] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0035] Figure 4 This is a schematic diagram of the back structure of the cover plate body in Embodiment 1 of this utility model;

[0036] Figure 5 This is a schematic diagram of the back structure of the insulating plate in Embodiment 1 of this utility model;

[0037] Figure 6 This is a schematic diagram of the terminal structure in Embodiment 1 of this utility model;

[0038] Figure 7 This is a schematic diagram of the terminal processing process in Embodiment 1 of this utility model;

[0039] Figure 8 This is a schematic diagram showing the fit of the cover plate body, terminals, bearing ring, insulating plate and sealing ring in Embodiment 2;

[0040] Figure 9 This is a top view of the bearing ring in Example 3;

[0041] Figure 10 This is a cross-sectional view of the bearing ring in Example 3.

[0042] Explanation of reference numerals in the attached figures

[0043] 1. Cover plate body; 2. Terminal through hole; 3. Terminal; 4. First anti-rotation groove; 5. Insulating plate; 6. Second groove; 7. First outer edge; 8. Second outer edge; 9. Column; 10. Bearing ring; 11. First cut edge; 12. Third anti-rotation groove; 13. Sealing ring; 14. First recessed groove; 15. Stop frame; 16. First protrusion; 17. Second recessed groove; 18. Leak detection channel; 19. First ring portion; 20. First connecting portion; 21. Second ring portion; 22. First step; 23. Second step; 24. Anti-torsion hole; 25. Anti-torsion column; 26. Third cut edge; 27. Second cut edge; 28. Column through hole; 29. ​​Fourth cut edge. Detailed Implementation

[0044] The present invention will now be described in detail with reference to the accompanying drawings. The embodiments described herein are merely preferred embodiments of the present invention. Those skilled in the art can conceive of other ways to implement the present invention based on the preferred embodiments, and such other ways also fall within the scope of the present invention.

[0045] Example 1

[0046] Reference Figures 1-6 A battery cover plate includes a cover plate body 1 with terminal through holes 2 and terminals 3 passing through the terminal through holes 2. It also includes an insulating plate 5 mounted on the upper part of the terminal through holes 2. The terminals 3 pass through the insulating plate 5, and the top of the terminals 3 has a first outer edge 7 and the bottom has a second outer edge 8. The insulating plate 5 and the terminals 3 are fixed to the cover plate body 1 by pressing the first outer edge 7 and the second outer edge 8 of the terminals 3 together. The three components are then fixed by riveting and pressing, initially achieving anti-torsion function. The process is simple, production efficiency is high, and it can reduce production costs. The cover plate body 1 and the insulating plate 5, as well as the insulating plate 5 and the terminals 3, are connected by anti-torsion structures, which further enhances the anti-torsion effect of the terminals. The structure is simple and easy to process.

[0047] The upper surface of the cover plate body 1 is provided with a first anti-rotation groove 4 outside the terminal through hole 2; the vertical cross section of the terminal 3 is approximately "I" shaped, and the middle part of the terminal between the first outer edge 7 and the second outer edge 8 is a column 9; at least a portion of the outer periphery of the insulating plate 5 is recessed in the first anti-rotation groove 4, and the inner wall of the first anti-rotation groove 4 and the outer periphery of the insulating plate 5 are configured to cooperate with the anti-torsion shape; a column through hole 28 is opened on the insulating plate 5; the column 9 passes through the column through hole 28, and the outer wall of the column 9 and the inner wall of the column through hole 28 are configured to cooperate with the anti-torsion shape; by pressing the first outer edge 7 and the second outer edge 8 of the terminal 3, the insulating plate 5 and the terminal 3 are fixed on the cover plate body 1. The insulating plate 5 and the cover plate body 1 achieve the effect of preventing relative rotation by utilizing the anti-torsion effect between the first anti-rotation groove 4 and the outer peripheral shape of the insulating plate 5. The terminal 3 and the insulating plate 5 also achieve the technical effect of preventing relative rotation by utilizing the anti-torsion shape between the outer wall of the column 9 and the inner wall of the column through hole 28. This achieves the anti-torsion effect of the terminal 3 relative to the cover plate body 1 and improves the safety performance of the battery.

[0048] By using riveting and pressing, the insulating plate 5 and the column 9 are fixed to the cover plate body 1 using the first outer edge 7 and the second outer edge 8. This achieves a simple process, high production efficiency, and reduced production costs. Furthermore, assuming the thickness of each structural component remains constant, the design of the first anti-rotation groove 4 reduces the distance between the upper surface of the first outer edge 7 and the upper surface of the cover plate body 1. This allows for an increase in the height of the individual battery cells within the limited space of the battery pack, thereby increasing the internal space and capacity of the individual battery cells and ultimately improving the energy density of the battery pack.

[0049] A second groove 6 is provided on the upper surface of the insulating plate 5, and a through hole 28 is located within the second groove 6. A bearing ring 10 is also provided within the second groove 6. The bearing ring 10 has a higher hardness than the insulating plate 5 and is used to support the first outer edge 7. Generally, the insulating plate 5 on the battery cover is made of plastic, which has low hardness and weak strength. If the first outer edge 7 is directly pressed onto the insulating plate 5, it is easy to crush the insulating plate 5, and it is also difficult to flatten the first outer edge 7. However, by using the bearing ring 10 with higher hardness to conduct the pressure transition, the possibility of the insulating plate 5 being crushed is reduced, which is conducive to flattening the first outer edge 7.

[0050] The outer wall of the column 9 is provided with at least one anti-torsion first cut edge 11, and the inner wall shape of the column through hole 28 is adapted to the outer wall shape of the column 9. The first cut edge 11 is any notch structure that can prevent the terminal 3 from rotating in the column through hole 28. It is more common to form a vertically extending plane after cutting off a part of the side wall of the column 9, rather than an arc surface. This can destroy the rotational structure of the outer wall of the column 9. After the inner wall of the column through hole 28 and the outer wall of the column 9 are adapted to each other, the anti-torsion function of the terminal 3 can be ensured. In this embodiment, a fourth cut edge 29 corresponding to the first cut edge 11 is provided on the inner wall of the column through hole 28, and the shape and size of the fourth cut edge 29 are adapted to the shape and size of the first cut edge 11, which can achieve the technical effect of preventing the terminal 9 from rotating in the column through hole 28.

[0051] The outer wall of the first outer edge 7 is provided with a third tangent 26 corresponding vertically to the first tangent 11, and the top of the first tangent 11 is connected to the first outer edge 7. (Refer to...) Figure 7 The figure shows the terminal structure before riveting. The outer edge 7' set vertically at the top of the column is the structure of the first outer edge 7 before riveting. After riveting, the outer edge 7' is flattened to form the first outer edge 7 in a horizontal state. Figure 7The middle cut edge 11' is the state of the first cut edge 11 before riveting. Since the cut edge 11' cuts all the way to the top of the outer edge 7', it is easy for the bearing ring 10 to be fitted onto the column. However, this also results in the outer edge 7' having a material shortage and thinning, resulting in weak structural strength. Therefore, the outer edge 7' is more likely to be flattened during the riveting process. In addition, due to the material shortage, when it is flattened to form the first outer edge 7, the third cut edge 26 is formed here.

[0052] The opening of the first anti-rotation groove 4 is triangular, quadrilateral, pentagonal, plum blossom-shaped, or other anti-torsional shapes. The shape of the opening of the first anti-rotation groove 4 is the shape of the opening when viewed from above. The above-mentioned shape setting is mainly to prevent the insulating plate 5 from rotating in the first anti-rotation groove 4. After adapting to the shape of the inner wall of the first anti-rotation groove 4, the outer shape of the insulating plate 5 can be triangular, quadrilateral, pentagonal, plum blossom-shaped, or other non-rotating body shapes. As long as the anti-torsional function can be achieved, theoretically, the opening can be any shape other than circular, with quadrilaterals being the most common.

[0053] The distance between the upper surface of the first outer edge 7 and the upper surface of the cover body 1 is 1.5~2.1mm. In currently commercially available lithium batteries, the distance between the upper surface of the terminal 3 and the upper surface of the cover body 1 is generally greater than 2.1mm. This application reduces the distance between the upper surface of the terminal 3 and the upper surface of the cover body 1 by setting the first anti-rotation groove 4 and the second groove 6, and sinking part of the insulating plate 5 and the bearing ring 10 into the groove, thereby improving the space utilization and energy density under the premise of limited internal space of the battery pack.

[0054] The bottom of the column 9 is cylindrical and fitted with a sealing ring 13. The height of the cylindrical area at the bottom of the column 9 is greater than the thickness of the sealing ring 13. The sealing ring 13 is located between the second outer edge 8 and the cover plate body 1. The cylindrical shape of the bottom of the column 9 facilitates the positioning of the sealing ring 13, which can be fitted onto the bottom of the column 9.

[0055] A first recess 14 is provided on the lower surface of the cover plate body 1 outside the terminal through hole 2, and the sealing ring 13 is located in the first recess 14. The first recess 14 can reduce the space occupied by the sealing ring 13 outside the cover plate body 1 inside the battery, further utilize the space inside the battery casing, so that the cell height can be increased, thereby improving space utilization and battery energy density.

[0056] The lower surface of the second outer edge 8 is less than 1.8 mm from the lower surface of the cover body 1. The lower surface of the second outer edge 8 using this solution is equivalent to the lower surface of the terminal 3, which can be within 1.8 mm of the lower surface of the cover body 1, greatly improving the space utilization rate inside the battery.

[0057] A stop frame 15 is also provided between the second outer edge 8 and the first sink 14. An annular first protrusion 16 is provided on the upper surface of the stop frame 15 near the first sink 14. The first protrusion 16 is located inside the first sink 14, and the sealing ring 13 is located inside the first protrusion 16. A second sink 17 is provided on the lower surface of the first protrusion 16, and the second outer edge 8 is located inside the second sink 17. This design further utilizes the pressed first outer edge 7 and second outer edge 8 to fix the stop frame 15, sealing ring 13, insulating plate 5, bearing ring 10, and cover plate body 1 together. The annular first protrusion 16 is located inside the first sink 14, which allows for positioning of the first protrusion 16 using the sidewalls and bottom of the first sink 14, and also improves the internal space utilization of the battery.

[0058] At least one transversely penetrating leak detection channel 18 is provided on the top of the first protrusion 16. Since no other sealing element is provided between the first protrusion 16 and the first sink 14, there will be a certain gap between the first protrusion 16 and the first sink 14 due to the existence of processing errors. The leak detection channel 18 runs through the inner and outer sides of the first protrusion 16. If the sealing effect of the sealing ring 13 is poor, the helium gas introduced into the battery will be discharged to the outside of the battery through the leak detection channel 18 and the gap between the sealing ring 13 and the cover plate body 1, which can be easily detected.

[0059] The insulating plate 5 includes a first ring portion 19, a first connecting portion 20, and a second ring portion 21 connected from top to bottom. The bottom of the first ring portion 19 and the first connecting portion 20 are located in the first anti-rotation groove 4, and the first ring portion 19 and the first connecting portion 20 together form a second groove 6 to protect the bearing ring 10 and the top of the terminal 3 inside. The second ring portion 21 is located in the terminal through hole 2 and can guide and limit the installation of the insulating plate 5.

[0060] The first cut edge 11 transitions to the cylindrical area of ​​the column 9 via a first step 22, and the gap between the bottom end of the second ring 21 and the first step 22 is 0~0.2mm. This is to prevent the second ring 21 from contacting the first step 22, which would result in a large installation error between the insulating plate 5, the cover plate body 1, and the terminal 3, affecting the normal function of the product.

[0061] Example 2

[0062] Reference Figure 8The difference between this embodiment and the first embodiment is that the column 9 is provided with a second step 23 for supporting the bearing ring 10, and the second step 23 is flush with the bottom of the groove of the second groove 6. During the riveting process and during the preparation of the first outer edge 7 at the top of the terminal 3, a large force may be applied to the middle of the bearing ring 10. Without the support of the second step 23, the bearing ring 10 may be pressed into a bowl-shaped ring with an inward concave and outward convex shape. The second step 23 can support the inner ring of the bearing ring 10 and prevent the upper surface of the first outer edge 7 after riveting from being uneven due to its deformation. A flat first outer edge 7 is beneficial for welding the bus element.

[0063] In vertical projection, the outer edge of the first outer edge 7 is located inside the outer edge of the bearing ring 10, and also within the first anti-rotation groove 4. By supporting the first outer edge 7 of the terminal 3 sequentially through the first anti-rotation groove 4 and the bearing ring 10, the support strength of the first outer edge 7 can be improved, which is beneficial for processing the first outer edge 7 with a flat top.

[0064] At least one anti-torsion hole 24 is provided at the bottom of the first anti-rotation groove 4, and an anti-torsion post 25 that is interference-fitted with the anti-torsion hole 24 is provided on the lower surface of the first connecting part 20. During assembly, the anti-torsion post 25 is inserted into the anti-torsion hole 24 to further prevent the insulating plate 5 from rotating relative to the cover plate body 1.

[0065] Both the edge of the anti-torsion hole 24 and the bottom of the anti-torsion column 25 are provided with guide slopes to facilitate the insertion of the anti-torsion column 25 into the anti-torsion hole 24.

[0066] The vertical projections of the anti-torsion hole 24 and the anti-torsion post 25 are located on the sealing ring 13. The thickness of the normally uncompressed sealing ring 13 is greater than the distance between the bottom of the first recess 14 and the second outer edge 8. During the assembly of the cover plate, the sealing ring 13 is compressed by the first recess 14 and the second outer edge 8, sealing the gap between them. Since the thickness of the first anti-rotation groove 4 is thinner than other parts of the cover plate body 1, and the anti-torsion post 25 and the anti-torsion hole 24 are interference-fitted, the middle part of the first anti-rotation groove 4 is pressed down and deformed during the insertion of the anti-torsion post 25 into the anti-torsion hole 24. This causes the periphery of the first anti-rotation groove 4 near the terminal through hole 2 to tilt downwards, further compressing the sealing ring 13 located outside the anti-torsion hole 24, thus improving the sealing effect.

[0067] Example 3

[0068] Reference Figure 9 and Figure 10The difference between this embodiment and the first and second embodiments is that the hardness of the material of the terminal 3 is lower than that of the bearing ring 10. For example, the terminal is made of aluminum or copper, while the bearing ring 10 is made of harder steel. The upper surface of the bearing ring 10 is provided with multiple third anti-rotation grooves 26. After pressing, some components of the first outer edge 7, or some tissue, are squeezed into the third anti-rotation grooves 26, thereby making the first outer edge 7 and the bearing ring 10 more firmly bonded, preventing the first outer edge 7 from rotating, and further preventing the terminal 3 from rotating.

[0069] The peripheral thickness of the bearing ring 10 is greater than its inner thickness, and the groove depth at the edge of the second groove 6 is greater than the groove depth near the terminal through hole 2. The bearing ring 10 is placed in the second groove 6, and its upper surface remains horizontal. During the riveting process, the outer side of the first outer edge 7 is subjected to greater force. The bearing ring 10 with a larger edge thickness can better support the first outer edge 7 and prevent the edge of the bearing ring 10 from being crushed. Correspondingly, in order to ensure that the upper surface of the bearing ring 10 is horizontal, the groove depth of the second groove 6 increases from the center to the periphery.

[0070] The inner wall of the bearing ring 10 is provided with a second cut edge 27 that is complementary to the shape of the first cut edge 11. The bearing ring 10 is fitted onto the column 9, and anti-torsion is achieved through the cooperation of the first cut edge 11 and the second cut edge 27. In fact, since the second cut edge 27 is a complementary structure to the first cut edge 11, for example, it is also a vertically extending plane and is adapted to the first cut edge 11, it can prevent the bearing ring 10 from rotating on the column 9, so as to prevent the bearing ring 10 from deflecting when riveting the first outer edge 7, which would affect the smooth flattening of the first outer edge 7.

[0071] The present invention also provides a battery, including the battery cover of the above three embodiments.

[0072] In the description of this utility model, it should be noted that the terms "front," "rear," "left," "right," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0073] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0074] The scope of protection of this utility model is defined only by the claims. Thanks to the teachings of this utility model, those skilled in the art will readily recognize that alternative structures to the disclosed structure can be used as feasible alternative implementations, and that the disclosed implementations can be combined to produce new implementations, which also fall within the scope of the appended claims.

Claims

1. A battery cover, comprising a cover body having a terminal through hole and a terminal passing through the terminal through hole into the cover body, characterized in that, It also includes an insulating plate installed on the upper part of the terminal through hole, the terminal penetrates the insulating plate, and the top of the terminal is provided with a first outer edge and the bottom is provided with a second outer edge. By pressing the first outer edge and the second outer edge of the terminal together, the insulating plate and the terminal are fixed on the cover plate body; the cover plate body and the insulating plate, as well as the insulating plate and the terminal, are all connected by an anti-torsion structure.

2. A battery cover according to claim 1, characterized in that, The upper surface of the cover plate body is provided with a first anti-rotation groove outside the terminal through hole; a column is formed between the first outer edge and the second outer edge of the terminal; at least a portion of the outer periphery of the insulating plate is recessed in the first anti-rotation groove, and the inner wall of the first anti-rotation groove and the outer periphery of the insulating plate are configured to cooperate with the anti-torsion shape; a column through hole is opened on the insulating plate; the column passes through the column through hole, and the outer wall of the column and the inner wall of the column through hole are configured to cooperate with the anti-torsion shape.

3. A battery cover according to claim 2, characterized in that, The upper surface of the insulating plate is provided with a second groove, and the through hole of the column is located in the second groove; a bearing ring is provided in the second groove, and the bearing ring has a hardness greater than that of the insulating plate, and is used to support the first outer edge.

4. A battery cover according to claim 2, characterized in that, The outer wall of the column is provided with at least one first tangential edge to resist torsion, and the inner wall shape of the through hole of the column is adapted to the outer wall shape of the column.

5. A battery cover according to claim 4, characterized in that, The outer wall of the first outer edge is provided with a third cutting edge corresponding to the first cutting edge in the vertical direction, and the top of the first cutting edge is connected to the first outer edge.

6. A battery cover according to claim 3, characterized in that, The inner wall of the bearing ring is provided with a second tangent that matches the shape of the first tangent. The bearing ring is fitted onto the column and resists torsion through the first and second tangents.

7. A battery cover according to claim 2, characterized in that, The opening of the first anti-rotation groove is one of the following shapes: triangular, quadrilateral, pentagonal, or plum blossom-shaped.

8. A battery cover according to claim 1, characterized in that, The distance between the upper surface of the first outer edge and the upper surface of the cover plate body is 1.5~2.1mm.

9. A battery cover according to claim 2, characterized in that, The bottom of the column is cylindrical and fitted with a sealing ring, which is located between the second outer edge and the cover plate body.

10. A battery cover according to claim 9, characterized in that, The lower surface of the cover plate body has a first recessed groove outside the terminal through hole, and the sealing ring is located in the first recessed groove.

11. The battery cover according to claim 10, characterized in that, The distance between the lower surface of the second outer edge and the lower surface of the cover plate body is less than 1.8 mm.

12. A battery cover according to claim 10, characterized in that, A stop frame is also provided between the second outer edge and the first sinking trough. The upper surface of the stop frame is provided with an annular first protrusion near the first sinking trough. The first protrusion is located in the first sinking trough. The lower surface of the first protrusion is provided with a second sinking trough. The second outer edge is located in the second sinking trough.

13. A battery cover according to claim 12, characterized in that, The top of the first protrusion is provided with at least one transverse leak detection channel.

14. A battery cover according to claim 4, characterized in that, The insulating plate includes a first ring portion, a first connecting portion and a second ring portion connected sequentially from top to bottom. The bottom of the first ring portion and the first connecting portion are located in a first anti-rotation groove, and the first ring portion and the first connecting portion form a second groove. The second ring portion is located in a terminal through hole.

15. A battery cover according to claim 14, characterized in that, The first cut edge and the cylindrical area of ​​the cylinder are transitioned by a first step, and the gap between the bottom end of the second ring and the first step is 0~0.2mm.

16. A battery cover according to claim 10, characterized in that, The column is provided with a second step for supporting the bearing ring, and the second step is flush with the bottom of the second groove.

17. A battery cover according to claim 16, characterized in that, In vertical projection, the outer edge of the first outer edge is located inside the outer edge of the bearing ring, and also within the first anti-rotation groove.

18. A battery cover according to claim 14, characterized in that, The bottom of the first anti-rotation groove is provided with at least one anti-torsion hole, and the lower surface of the first connecting part is provided with an anti-torsion post that is interference-fitted with the anti-torsion hole.

19. A battery cover according to claim 18, characterized in that, The edge of the anti-torsion hole and the bottom of the anti-torsion column are both provided with guide slopes.

20. A battery cover according to claim 18, characterized in that, The vertical projections of the anti-torsion hole and the anti-torsion post are located on the sealing ring, and the first anti-rotation groove is inclined downward near the periphery of the terminal through hole.

21. A battery cover according to any one of claims 1-20, characterized in that, The terminal is made of a material with a lower hardness than the bearing ring, and the upper surface of the bearing ring is provided with a plurality of third anti-rotation grooves; after pressing, part of the tissue of the first outer edge is squeezed into the third anti-rotation grooves.

22. A battery cover according to claim 21, characterized in that, The peripheral thickness of the bearing ring is greater than its inner thickness, the groove depth at the edge of the second groove is greater than the groove depth near the terminal through hole, the bearing ring is placed in the second groove, and its upper surface remains horizontal.

23. A battery, characterized in that, Includes the battery cover as described in any one of claims 1-22.

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