High-strength PPS rubber-coated lithium battery cover plate

Abstract

The utility model discloses a high-strength PPS (Polyphenylene Sulfide) rubber-coated lithium battery cover plate, which relates to the technical field of lithium battery components, aims to solve the technical problem that the existing battery pole is not firmly mounted and is easy to rotate, and comprises a top cover sheet, positive and negative pole columns, lower plastic, positive and negative pole sealing rings and positive and negative pole connecting sheets, the positions, close to the two ends, of the surface of the top cover piece are each provided with an installation groove, the positive and negative pole columns are installed in the installation grooves, the positive and negative pole sealing rings are arranged on the column faces of the positive and negative pole columns in a sleeving mode, and the positive and negative pole connecting pieces are correspondingly and fixedly connected with the positive and negative pole columns. The contact area between the upper plastic and the positive and negative poles can be increased to avoid rotation of the positive and negative poles; anti-rotation tooth-shaped knurls are arranged on the inner side walls of the clamping grooves and can prevent the positive and negative pole columns from rotating, and upper plastic covers the peripheries of the upper ends of the positive and negative pole columns and gaps between the positive and negative pole columns and the mounting grooves; tooth-shaped grooves are formed in the lower plastic and opposite to the rubber coating positions of the positive and negative pole columns, so that the positive and negative pole columns are prevented from rotating.

Description

Technical Field

[0001] The utility model relates to the technical field of battery recycling and treatment, and more specifically, to a high-strength PPS-coated lithium battery cover plate. Background Art

[0002] A lithium battery is composed of a housing, a lithium battery core (composed of a plurality of positive and negative electrode sheets separated by a separator) arranged in the cavity of the housing, and a cover plate. Since lithium batteries have advantages such as large capacity, light weight, long service life, high energy density, no memory effect, low self-discharge rate, and environmental friendliness, they are highly regarded by the industry and widely used in electric vehicles, electric bicycles, and various hardware tools, etc.

[0003] Currently, the housing and the cover plate of a lithium battery are manufactured separately, and then operations such as assembly and liquid injection are carried out after the battery core is installed, and finally a complete lithium battery is formed. The structure of the lithium battery cover plate is a very important part. Components such as electrode posts need to be mounted on its upper part, and liquid injection operations are carried out through it. In the later use process, a series of performances such as its sealing performance, insulation performance, and durability need to meet corresponding standards. In the prior art, for the installation of the battery electrode post, a groove is first opened on the lithium battery cover plate, and the electrode post is correspondingly placed in the groove and then plastic is filled into its gap. However, after the battery is used for a long time, due to the action of high temperature, the insulating plastic will come off, and then there will be problems such as the electrode post being insecurely installed and easy to rotate. In view of this, we propose a high-strength PPS-coated lithium battery cover plate. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and solve the technical problem that the existing battery electrode post is insecurely installed and easy to rotate.

[0005] To solve the above technical problems, the utility model provides a high-strength PPS-coated lithium battery cover plate, which includes a top cover sheet, positive and negative electrode posts, lower plastics arranged oppositely at the bottom of the top cover sheet, positive and negative electrode sealing rings, and positive and negative electrode connecting sheets; wherein, installation grooves are respectively opened at positions near both ends on the surface of the top cover sheet, the positive and negative electrode posts are installed in the installation grooves, the positive and negative electrode sealing rings are sleeved on the column surfaces of the positive and negative electrode posts, and the surfaces of the positive and negative electrode sealing rings are in contact with the side walls of the installation grooves. The positive and negative electrode connecting sheets are correspondingly fixedly connected to the positive and negative electrode posts. A circular groove is opened at the rubber-coated part on the side wall of the positive and negative electrode posts, and anti-rotation tooth-shaped knurling is arranged on the inner side wall of the groove. The upper parts of the outer peripheries of the upper ends of the positive and negative electrode posts and the gaps between them and the installation grooves are all coated with upper plastics; tooth-shaped grooves are arranged on the lower plastics at positions opposite to the rubber-coated parts of the positive and negative electrode posts.

[0006] In the present utility model, a circle of card slots is provided at the side wall rubber coating of the positive and negative electrode posts, which can increase the contact area between the upper plastic and the positive and negative electrode posts, thereby improving the installation strength of the positive and negative electrode posts and preventing the positive and negative electrode posts from rotating; anti-rotation tooth-shaped knurling is provided on the inner side wall of the card slot, which can increase the friction force with the upper plastic, and further prevent the positive and negative electrode posts from rotating; a tooth-shaped groove is provided on the lower plastic at a position opposite to the rubber coating of the positive and negative electrode posts, which can improve the connection strength with the positive and negative electrode posts and further prevent the positive and negative electrode posts from rotating.

[0007] Preferably, the material of the upper plastic coated on the positive electrode post is conductive PPS material, and the material of the upper plastic coated on the negative electrode post is insulating PPS material.

[0008] Preferably, a pressure relief and explosion-proof hole is provided in the middle of the positive and negative electrode posts, and an explosion-proof valve sheet is arranged in the pressure relief and explosion-proof hole.

[0009] Preferably, the material of the explosion-proof valve sheet is aluminum alloy material.

[0010] Preferably, an explosion-proof film is provided at the top of the pressure relief and explosion-proof hole, and a plurality of exhaust holes communicating with the pressure relief and explosion-proof hole are further provided on the explosion-proof film, so that the explosion-proof valve sheet can exhaust gas under a pressure of 0.7 ± 0.2 MPa, and there is no air leakage at the weld of the explosion-proof valve sheet before explosion.

[0011] Preferably, the material of the explosion-proof film is transparent PET material.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: In the present utility model, a circle of card slots is provided at the side wall rubber coating of the positive and negative electrode posts, which can increase the contact area between the upper plastic and the positive and negative electrode posts, thereby improving the installation strength of the positive and negative electrode posts and preventing the positive and negative electrode posts from rotating; anti-rotation tooth-shaped knurling is provided on the inner side wall of the card slot, which can increase the friction force with the upper plastic, and further prevent the positive and negative electrode posts from rotating; a tooth-shaped groove is provided on the lower plastic at a position opposite to the rubber coating of the positive and negative electrode posts, which can improve the connection strength with the positive and negative electrode posts and further prevent the positive and negative electrode posts from rotating. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of an embodiment of a high-strength PPS rubber-coated lithium battery cover plate of the present utility model;

[0014] Figure 2 is an exploded structural diagram of a high-strength PPS rubber-coated lithium battery cover plate in an embodiment of the present utility model;

[0015] Figure 3 is a top view structural diagram of a top cover sheet in an embodiment of the present utility model;

[0016] Figure 4Schematic cross-sectional structure diagram of the positive and negative electrode posts in the embodiment of the present utility model;

[0017] Figure 5 Schematic top view structure diagram of the lower plastic in the embodiment of the present utility model.

[0018] Explanation of the reference numerals in the figure:

[0019] 1. Top cover sheet; 101. Installation groove; 102. Pressure relief and explosion-proof hole; 2. Positive and negative electrode posts; 201. Card slot; 202. Anti-rotation serrated knurling; 3. Lower plastic; 301. Serrated groove; 4. Positive and negative electrode sealing rings; 5. Positive and negative electrode connection pieces; 6. Upper plastic; 7. Explosion-proof valve sheet; 8. Explosion-proof film. Specific implementation manner

[0020] To facilitate those skilled in the art to understand the technical solution of the present utility model, the technical solution of the present utility model will be further described below with reference to the accompanying drawings of the specification.

[0021] Embodiment 1

[0022] As Figure 1 shown, this embodiment discloses a high-strength PPS-coated lithium battery cover plate, including a top cover sheet 1, positive and negative electrode posts 2, a lower plastic 3, positive and negative electrode sealing rings 4, and positive and negative electrode connection pieces 5.

[0023] Specifically, as Figures 1 - 3 shown, at positions near both ends of the surface of the top cover sheet 1 of this embodiment, an installation groove 101 is respectively opened, and a pressure relief and explosion-proof hole 102 is opened in the middle of the positive and negative electrode posts 2.

[0024] As Figure 1 , Figure 2 and Figure 4 shown, the positive and negative electrode posts 2 of this embodiment mainly include a positive electrode post and a negative electrode post. The positive electrode post and the negative electrode post are respectively installed in two installation grooves 101, and a circle of card slots 201 is opened at the rubber-coated part of the side wall of the positive and negative electrode posts 2, and anti-rotation serrated knurling 202 is provided on the inner side wall of the card slots 201.

[0025] As Figure 1 , Figure 2 and Figure 5 shown, the lower plastic 3 of this embodiment is oppositely arranged at the bottom of the top cover sheet 1, and a serrated groove 301 is provided at the position on the lower plastic 3 opposite to the rubber-coated part of the positive and negative electrode posts 2.

[0026] As Figure 1 , Figure 2 shown, the positive and negative electrode sealing rings 4 of this embodiment are sleeved on the column surface of the positive and negative electrode posts 2, and the surface of the positive and negative electrode sealing rings 4 abuts against the side wall of the installation groove 101.

[0027] As Figure 1 ,Figure 2 As shown in the figure, the positive and negative connection pieces 5 of this embodiment are fixedly connected to the positive and negative posts 2 correspondingly, that is, the positive connection piece is fixedly connected to the positive post, and the negative connection piece is fixedly connected to the negative post.

[0028] As Figure 1 , Figure 2 As shown in the figure, the upper periphery of the upper end of the positive and negative posts 2 of this embodiment and the gap between it and the installation groove 101 are all coated with an upper plastic 6; among them, the material of the upper plastic 6 coated on the positive post is a conductive PPS material, and the material of the upper plastic 6 coated on the negative post is an insulating PPS material.

[0029] As another embodiment of the present utility model, as Figure 1 , Figure 2 As shown in the figure, an explosion-proof valve sheet 7 is arranged in the pressure relief and explosion-proof hole 102 of this embodiment. The material of the explosion-proof valve sheet 7 is an aluminum alloy material. An explosion-proof film 8 is arranged at the top of the pressure relief and explosion-proof hole 102. A plurality of exhaust holes communicating with the pressure relief and explosion-proof hole 102 are also arranged on the explosion-proof film 8. The material of the explosion-proof film 8 is a transparent PET material, so that the explosion-proof valve sheet 7 can exhaust gas under a pressure of 0.7 ± 0.2 MPa, and there is no air leakage at the weld of the explosion-proof valve sheet 7 before explosion.

[0030] In the present utility model, a circular groove 201 is provided at the side wall rubber coating of the positive and negative posts 2, which can increase the contact area between the upper plastic 6 and the positive and negative posts 2, thereby improving the installation strength of the positive and negative posts 2 and preventing the positive and negative posts 2 from rotating; anti-rotation tooth-shaped knurling 202 is arranged on the inner side wall of the groove 201, which can increase the friction with the upper plastic 6, thereby further preventing the positive and negative posts 2 from rotating; a tooth-shaped groove 301 is arranged on the lower plastic 3 at the position opposite to the rubber coating of the positive and negative posts 2, which can improve the connection strength between it and the positive and negative posts 2 and further prevent the positive and negative posts 2 from rotating.

[0031] In the present utility model, the explosion-proof valve sheet 7 bursts at a pressure of 0.6 ± 0.2 MPa after each state lasts for 30 s and breathes 10 cycles at a pressure of 0.15 MPa from inside to outside and from outside to inside; the insulation resistance between the negative post and the top cover sheet 1 is greater than 200 Ω and is not broken down under a voltage of 500 V; the resistance between the positive post and the top cover sheet 1 is 2 - 10000 Ω; at a pressure of 0.8 MPa at the positive and negative posts 2, there is no air leakage for 30 s from inside to outside and from outside to inside.

[0032] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

[0033] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising said element.

[0034] The embodiments disclosed in the present utility model are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present utility model based on the above embodiments and make different extensions and changes. As long as they do not depart from the spirit of the present utility model, they are within the protection scope of the present utility model.

Claims

1. A high-strength PPS-coated lithium battery cover plate, comprising a top cover sheet (1), positive and negative electrode posts (2), lower plastics (3) oppositely arranged at the bottom of the top cover sheet (1), positive and negative electrode sealing rings (4) and positive and negative electrode connecting sheets (5); wherein, An installation groove (101) is respectively formed at a position near both ends on the surface of the top cover sheet (1). The positive and negative electrode posts (2) are installed in the installation groove (101). The positive and negative electrode sealing rings (4) are sleeved on the column surfaces of the positive and negative electrode posts (2), and the surface of the positive and negative electrode sealing rings (4) abuts against the side wall of the installation groove (101). The positive and negative electrode connecting pieces (5) are correspondingly fixedly connected to the positive and negative electrode posts (2). It is characterized in that: A circle of clamping grooves (201) is formed at the rubber-coated part on the side wall of the positive and negative electrode posts (2), and anti-rotation tooth-shaped knurling (202) is arranged on the inner side wall of the clamping grooves (201). The upper periphery of the upper end of the positive and negative electrode posts (2) and the gap between it and the installation groove (101) are both coated with upper plastic (6); A tooth-shaped groove (301) is arranged on the lower plastic (3) at a position opposite to the rubber-coated part of the positive and negative electrode posts (2).

2. The high-strength PPS-coated lithium battery cover plate according to claim 1, wherein: The material of the upper plastic (6) coated on the positive electrode post is conductive PPS material, and the material of the upper plastic (6) coated on the negative electrode post is insulating PPS material.

3. The high-strength PPS-coated lithium battery cover plate according to claim 1, wherein: A pressure relief and explosion-proof hole (102) is formed in the middle of the positive and negative electrode posts (2), and an explosion-proof valve sheet (7) is arranged in the pressure relief and explosion-proof hole (102).

4. The high-strength PPS-coated lithium battery cover plate according to claim 3, wherein: The material of the explosion-proof valve sheet (7) is aluminum alloy material.

5. The high-strength PPS-coated lithium battery cover plate according to claim 4, wherein: An explosion-proof film (8) is arranged at the top of the pressure relief and explosion-proof hole (102), and a plurality of exhaust holes communicated with the pressure relief and explosion-proof hole (102) are also arranged on the explosion-proof film (8).

6. The high-strength PPS-coated lithium battery cover plate according to claim 5, wherein: The material of the explosion-proof film (8) is transparent PET material.

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