Cover plate assembly with anti-rotation structure and power battery

Abstract

The invention discloses a cover plate assembly with an anti-rotation structure and a power battery, and relates to the field of power batteries, the cover plate assembly comprises a pole and a light cover plate, the light cover plate is provided with a mounting groove, the outer side of the pole is wrapped with upper plastic, the bottom surface of the upper plastic is provided with an anti-torsion column, and the mounting groove is internally provided with an anti-torsion groove matched with the anti-torsion column; an anti-torsion rib is arranged on the side face of the upper plastic and can be attached to the inner wall of the installation groove. According to the cover plate assembly, the anti-rotation structure is designed between the upper plastic and the light cover plate to fix the pole and the light cover plate, so that the assembly can be realized, the pole can be prevented from rotating, and the use performance of the cover plate assembly is ensured.

Description

Technical Field

[0001] This invention relates to the field of power batteries, and more particularly to a cover plate assembly with an anti-rotation structure and a power battery. Background Technology

[0002] With the rapid development of new energy and the increasingly widespread application of power batteries, the concepts of ultimate performance, ultimate safety, and ultimate cost have emerged. The ultimate safety performance of battery cells is closely related to the safety of the entire vehicle and consumers. As a key component of the battery cell structure, the safety performance of the cover plate assembly is of paramount importance. Currently, the commonly used structure for cover plate assemblies is a riveted structure, which uses a smooth cover plate, upper plastic, and terminal compression sealing ring. However, due to the processing tolerances, assembly tolerances, or unreasonable design of various parts, a gap inevitably exists between the upper plastic and the smooth cover plate. This gap is the space where the terminal can rotate. After the terminal is welded and installed in the vehicle, it is affected by actual road conditions and subjected to long-term impacts and vibrations, which can damage the sealing ring and internal tabs, significantly impacting the lifespan and safety of the battery cell.

[0003] For cover plate assemblies, some anti-rotation designs have been implemented in the prior art. For example, a cover plate assembly is disclosed in the prior art in which the conductive post and the outer welding ring are insulated by an upper plastic, and the periphery of the upper plastic is engaged with the outer welding ring to achieve anti-rotation. In the above solution, the anti-rotation boss on the top of the upper plastic is engaged with the anti-rotation groove on the inner side of the outer welding ring, and then the outer welding ring is welded and fixed to the light cover plate. This anti-rotation structure relies on the intermediate component—the outer welding ring, and the anti-rotation effect is easily affected by the quality of the outer welding ring. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a cover plate assembly and a power battery with an anti-rotation structure. An anti-rotation structure is designed between the upper plastic and the light cover plate to fix the terminal post and the light cover plate, thereby enabling assembly and preventing the terminal post from rotating, ensuring the performance of the cover plate assembly.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, embodiments of the present invention provide a cover plate assembly with an anti-rotation structure, including an electrode post and a light cover plate. The light cover plate has an installation groove. The electrode post is wrapped with an upper plastic layer. An anti-torsion post is provided on the bottom surface of the upper plastic layer. The installation groove has an anti-torsion groove that cooperates with the anti-torsion post. An anti-torsion rib is provided on the side of the upper plastic layer. The anti-torsion rib can fit against the inner wall of the installation groove.

[0006] As a further implementation, the upper plastic is provided with two anti-torsion pillars, and the two anti-torsion pillars are arranged diagonally.

[0007] As a further implementation, the anti-torsion ribs are provided on at least two symmetrical sides of the upper plastic, with at least two anti-torsion ribs on each side.

[0008] As a further implementation, the anti-torsion column has a polygonal cross-section.

[0009] As a further implementation, the cross-section of the anti-torsion column is a cross-shaped or hexagonal structure. As a further implementation, the anti-torsion reinforcement is a diagonal reinforcement structure, so that the cross-section of the anti-torsion reinforcement gradually decreases from top to bottom.

[0010] As a further implementation, a lower plastic is installed on the underside of the light cover plate, and the pole post, light cover plate, and lower plastic are all sleeved on the outside of the conductive post.

[0011] As a further implementation, a sealing ring is installed on the mating surface of the conductive post.

[0012] As a further implementation, the light cover is equipped with an explosion-proof valve.

[0013] Secondly, embodiments of the present invention also provide a power battery, including the aforementioned cover assembly.

[0014] The beneficial effects of this invention are as follows: (1) The cover plate assembly of the present invention includes an electrode post and a light cover plate. The light cover plate has an installation groove. The upper plastic bottom surface on the outer side of the electrode post is provided with an anti-torsion post. The installation groove has an anti-torsion groove that cooperates with the anti-torsion post. At the same time, an anti-torsion rib is provided on the side of the upper plastic. By designing an anti-rotation structure between the upper plastic and the light cover plate, the electrode post and the light cover plate are fixed, so that assembly can be achieved and the electrode post can be prevented from rotating.

[0015] (2) The anti-torsion posts of the present invention are arranged diagonally, and their cross-sections are irregularly shaped, such as cross-shaped or hexagonal, etc., which, together with the anti-torsion groove, play an effective role in preventing rotation; the anti-torsion ribs are oblique ribs, with at least two distributed at intervals on the side of the upper plastic, so that the lower plastic forms a structure that is smaller at the bottom and larger at the top, so that the lower plastic can smoothly enter the mounting groove of the cover plate, and at the top of the cover plate, the lower plastic gradually contacts the cover plate, thereby achieving zero-gap fit between the upper plastic and the cover plate; through the combination of irregular anti-torsion posts and anti-torsion ribs, the pole post is prevented from rotating, thereby ensuring the installability of the battery cell. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Figure 1This is an assembly diagram of the cover plate assembly according to one or more embodiments of the present invention; Figure 2 This is an exploded view of a cover plate assembly according to one or more embodiments of the present invention; Figure 3 This is a schematic diagram of the light cover plate structure according to one or more embodiments of the present invention; Figure 4 This is a schematic diagram of the pole post structure according to one or more embodiments of the present invention; Figure 5 This is a cross-sectional view of a cover plate assembly according to one or more embodiments of the present invention; Figure 6 yes Figure 5 A magnified view of a portion at point F.

[0018] Among them, 1. Cover plate assembly; 10. Terminal post; 11. Cover plate; 12. Lower plastic part; 13. Explosion-proof valve; 100. Aluminum block; 101. Plastic coating; 102. Sealing ring; 103. Conductive post; 110. Mounting groove; 111. Anti-torsion groove; 1010, Anti-torsion column; 1011, Anti-torsion reinforcement; 1031, Slab; 1032, Column. Detailed Implementation

[0019] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0020] For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] Example 1: During the assembly process of the power battery cover assembly 1, the assembly tolerances of each component will accumulate in the gap between the upper plastic 101 and the light cover 11. The size of this gap affects the assembly of the terminal post and is prone to relative rotation between the terminal post 10 and the light cover 11, affecting battery safety. In order to solve the rotation problem, some existing technologies have added anti-rotation functions to the cover assembly 1, but this increases the complexity of the cover assembly 1 structure and is prone to anti-rotation failure.

[0022] Based on this, this embodiment provides a cover plate assembly with an anti-rotation structure, such as... Figure 1 and Figure 2 As shown, it includes a cover plate 11, a lower plastic part 12, a conductive post 103, an electrode post 10, an explosion-proof valve 13, etc., assembled by riveting and welding processes; according to Figure 1 In the view shown, the upper surface of the cover plate 11 is provided with a mounting groove 110, and the pole post 10 is engaged with the mounting groove 110; a lower plastic 12 is installed on the lower side of the cover plate 11, and the conductive post 103 passes through the lower plastic 12, the cover plate 11 and the pole post 10 from bottom to top, and a sealing ring 102 is provided on the contact surface between the conductive post 103 and the lower plastic 12, the cover plate 11 and the pole post 10.

[0023] The electrode post 10 includes an aluminum block 100 and an upper plastic 101. The upper plastic 101 wraps around the periphery and lower surface of the aluminum block 100. The aluminum block 100 is insulated from the light cover plate 11 by the upper plastic 101. The conductive post 103 is insulated from the light cover plate 11 by the sealing ring 102 and the lower plastic 12, and the sealing performance is achieved by the sealing ring 102.

[0024] In this embodiment, the pole post 10, the mounting groove 110, and the light cover plate 11 are all rectangular structures.

[0025] like Figure 2 As shown, the conductive post 103 includes a plate 1031 and a post 1032 connected as one piece. The post 1032 is located at the center of the plate 1031. The sealing ring 102 is fitted onto the post. In order to cooperate with the lower plastic 12, the light cover plate 11 and the center hole of the pole post 10, the sealing ring 102 is configured as a multi-level structure.

[0026] The assembly sequence of cover plate assembly 1 is as follows: From bottom to top, first, the sealing ring 102 is fitted onto the outside of the conductive post 103. Then, the lower plastic 12 is fitted onto the outside of the conductive post 103, and is coaxially arranged with the conductive post 103 and the sealing ring 102. Similarly, the cover plate 11 is fitted onto the conductive post 103, and is coaxial with the conductive post 103, with the cover plate 11 in contact with the lower plastic 12. Next, the electrode post 10 is fitted onto the conductive post 103, and the upper plastic 101 of the electrode post 10 is installed in the mounting groove 110 of the cover plate 11. During the above assembly process, the dimensional and positional tolerances of each component ultimately accumulate in the gap between the upper plastic 101 and the mounting groove 110 of the cover plate 11.

[0027] Because the gap is too small, the upper plastic 101 is difficult to fit into the mounting slot 110 of the cover plate 11. During installation, the upper plastic 101 may be damaged, chipped, or develop microcracks. Under long-term use or harsh conditions, insulation failure may occur, leading to uncontrolled phenomena such as short circuits and explosions of the battery cell. If the gap is too large, although assembly is more convenient, after assembly, especially after welding the tabs to the battery cell end, the entire pole post 10 is prone to rotation under certain torque. Over time, this will damage the compression surface of the sealing ring 102 and the internal tabs, leading to short circuits and air / liquid leaks such as tab tearing, ultimately causing the battery cell to become uncontrollable.

[0028] Therefore, in this embodiment, an anti-rotation structure is provided on the mating surface between the light cover plate 11 and the pole post 10. Specifically, the surface of the light cover plate 11 where the mounting groove 110 is located is taken as the upper surface, and the mating surface between the pole post 10 and the mounting groove 110 is taken as the bottom surface, such as... Figure 3 and Figure 4 As shown, a number of anti-torsion posts 1010 are provided on the bottom surface of the upper plastic 101, and an anti-torsion groove 111 adapted to the anti-torsion posts 1010 is provided on the upper surface of the mounting groove 110. The anti-torsion posts 1010 and the anti-torsion groove 111 are inserted and matched, which can realize the positioning of the pole post 10 and the light cover plate 11, and at the same time realize the anti-torsion function.

[0029] The anti-torsion post 1010 has a certain height, the specific height value is set according to the battery model, as long as it can ensure the stable insertion of the anti-torsion post 1010 and the anti-torsion groove 111.

[0030] In this embodiment, the pole post 10 is a rectangular block structure, and two anti-torsion posts 1010 are arranged diagonally on the left and right sides along the pole post 10, which can effectively prevent torsion. It can be understood that in other embodiments, the number and layout of the anti-torsion posts 1010 can be adjusted.

[0031] If the anti-torsion column 1010 is cylindrical, its anti-torsion effect is poor; therefore, in order to enhance the anti-torsion performance, the cross-section of the anti-torsion column 1010 in this embodiment is set to an irregular shape, such as a cross-shaped structure, a hexagonal structure, a plum blossom-shaped structure, etc., to form a multi-directional limiting. The shape of the anti-torsion groove 111 is consistent with the shape of the anti-torsion column 1010.

[0032] Meanwhile, anti-torsion ribs 1011 are also provided on the outer wall of the upper plastic 101. In this embodiment, for example... Figures 4-6As shown, two anti-torsion ribs 1011 are spaced apart on the outer walls of both sides of the upper plastic 101 in the width direction. The anti-torsion ribs 1011 are oblique ribs, and their cross-sections gradually decrease from top to bottom, forming an oblique structure on the side wall of the upper plastic 101. By setting the anti-torsion ribs 1011, the upper plastic 101 plays a guiding role during insertion into the mounting groove 110, and due to its oblique structure, the lower plastic 12 can smoothly enter the mounting groove 110; the lower plastic 12 gradually comes into contact with the cover plate 11, thereby achieving a zero-gap fit between the upper plastic 101 and the cover plate 11, further improving the rotation of the pole post 10.

[0033] Understandably, in other embodiments, the sidewall of the upper plastic 101 may also be provided with three or more anti-torsion ribs 1011, depending on the size of the pole post 10.

[0034] Therefore, by setting irregular anti-torsion posts 1010 on the bottom surface of the upper plastic 101 in conjunction with external anti-torsion ribs 1011, the rotation problem of the pole post 10 is avoided, thereby ensuring the safety of the battery cell.

[0035] It should be noted that the electrode post 10 installed on the cover plate 11 is a positive electrode post and / or a negative electrode post. The positive electrode post includes a positive conductive post, a positive aluminum block, a positive plastic on the electrode, and a positive sealing ring. The negative electrode post includes a negative conductive post, a negative aluminum block, a negative plastic on the electrode, and a negative sealing ring. The negative conductive post is a copper-aluminum composite structure and is an integral structure.

[0036] In this embodiment, an anti-rotation structure is provided on the mating surface of the upper plastic 101 and the cover plate 11 to reduce error transmission through direct mating. The combined anti-rotation structure of the anti-torsion column 1010 and the anti-torsion rib 1011 can withstand the core torque through insertion mating and disperse the lateral stress generated by vibration through side contact, making it particularly suitable for high-frequency vibration scenarios such as vehicle movement. The anti-torsion rib 1011 gradually fits into the inner wall of the mounting groove 110, so that the upper plastic 101 and the mounting groove 110 form an effective fit.

[0037] This embodiment does not require additional components such as welding rings, and achieves anti-torsion by simplifying the structure of the cover plate assembly 1.

[0038] Example 2: This embodiment provides a cover plate assembly with an anti-rotation structure, which differs from Embodiment 1 in that: An anti-torsion post 1010 is provided in the mounting groove of the cover plate 11, and an anti-torsion groove 111 adapted to the anti-torsion post 1010 is provided on the bottom surface of the upper plastic 101.

[0039] The remaining structure is the same as in Example 1, and will not be described again here.

[0040] Example 3: This embodiment provides a power battery, including a housing, the top of which is connected to the cover plate assembly 1 described in Embodiment 1, and a cell module is installed inside the housing.

[0041] In this embodiment, the power battery casing is also provided with an explosion-proof pressure relief structure, which works in conjunction with the explosion-proof valve 13 in the cover assembly 1. When the pressure inside the power battery rises sharply due to short circuit, overcharging, or other reasons, the explosion-proof valve 13 first ruptures to release the internal high-pressure gas. At the same time, an auxiliary pressure relief valve is provided at the bottom or side wall of the casing. The opening pressure of the auxiliary pressure relief valve is slightly higher than that of the explosion-proof valve 13. When the explosion-proof valve 13 fails to release pressure in time or the internal pressure continues to rise, the auxiliary pressure relief valve opens to further accelerate the pressure relief and prevent the casing from exploding due to excessive pressure.

[0042] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cover plate assembly with an anti-rotation structure, characterized in that, The device includes an electrode post and a light cover plate. The light cover plate has an installation groove. The electrode post is wrapped with an upper plastic layer. The bottom surface of the upper plastic layer is provided with an anti-torsion post. The installation groove has an anti-torsion groove that cooperates with the anti-torsion post. The upper plastic layer has an anti-torsion rib on its side, which can fit against the inner wall of the installation groove.

2. A cover plate assembly with an anti-rotation structure according to claim 1, characterized in that, The upper plastic is provided with two anti-torsion columns, which are arranged diagonally.

3. A cover plate assembly with an anti-rotation structure according to claim 1, characterized in that, The anti-torsion ribs are provided on at least two symmetrical sides of the upper plastic, with at least two anti-torsion ribs on each side.

4. A cover plate assembly with an anti-rotation structure according to claim 1 or 2, characterized in that, The anti-torsion column has a polygonal cross-section.

5. A cover plate assembly with an anti-rotation structure according to claim 4, characterized in that, The anti-torsion column has a cross-shaped or hexagonal cross-section.

6. A cover plate assembly with an anti-rotation structure according to claim 1 or 3, characterized in that, The anti-torsion reinforcement is a diagonal reinforcement structure, so that the cross-section of the anti-torsion reinforcement gradually decreases from top to bottom.

7. A cover plate assembly with an anti-rotation structure according to claim 1, characterized in that, The lower plastic is installed on the underside of the light cover plate, and the electrode post, light cover plate and lower plastic are all sleeved on the outside of the conductive post.

8. A cover plate assembly with an anti-rotation structure according to claim 7, characterized in that, A sealing ring is installed on the mating surface of the conductive post.

9. A cover plate assembly with an anti-rotation structure according to claim 1, characterized in that, The cover plate is equipped with an explosion-proof valve.

10. A power battery, characterized in that, Includes the cover plate assembly as described in any one of claims 1-9.

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