Square aluminum shell lithium ion battery cover plate

Abstract

The utility model discloses a square aluminum shell lithium ion battery cover plate, and belongs to the technical field of battery cover plates. The square aluminum shell lithium ion battery cover plate comprises a lower plastic plate; the cover plate piece is attached to the lower plastic plate; the positive pole and the negative pole are symmetrically arranged on the cover plate; wherein each of the positive pole and the negative pole comprises a pole piece, and a connecting piece is integrally formed at the lower end of each pole piece; the positive pole and the negative pole are cast in an integral forming manner, so that the manufacturing period of the battery is shortened, the internal resistance of the battery and the surface temperature rise of the battery are reduced, the overflowing area of the current collector is increased, the interface resistance of the battery is reduced, and the safety coefficient of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery covers, in particular to a square aluminum shell lithium-ion battery cover. Background Art

[0002] A square battery generally includes an aluminum shell / steel shell, a square cover plate, positive and negative electrode plates, electrolyte, etc. Due to the changeable use environment and longer service life in this market, higher requirements are put forward for the structural stability of the battery. Currently, the mainstream in this market is square aluminum shell lithium-ion batteries. As the core component in the battery structure, the cover plate has higher requirements for stability.

[0003] The prior art Chinese patent publication CN202110705669 discloses a square aluminum shell battery cover plate, which includes a substrate and a lower plastic plate connected integrally. A negative connection piece and a positive connection piece are connected to the lower plastic plate. The negative connection piece and the positive connection piece are both provided with convex parts. The convex parts penetrate through the substrate and the lower plastic plate upward. The substrate is provided with a positive electrode post formed by integral stamping and a sunken negative electrode installation groove. A negative electrode post sealing ring with a T-shaped cross-section is arranged at the negative electrode installation groove. The inner diameter of the negative electrode post sealing ring is in interference fit with the convex part of the negative connection piece, and the lower end surface of the negative electrode post sealing ring is in contact with the substrate surface. A negative electrode post is tightly connected inside the negative electrode post sealing ring. The diameter of the negative electrode post is larger than that of the negative electrode installation groove, and the positive electrode post and the negative electrode post are respectively in contact with the convex parts of the negative connection piece and the positive connection piece. A negative electrode insulating sheet and a positive electrode insulating sheet are also fixedly connected to the substrate. The negative electrode insulating sheet and the positive electrode insulating sheet are respectively pressed on the negative electrode post and the positive electrode post.

[0004] The disadvantages of the above disclosed technology are as follows: The lower end of the positive electrode post needs to be welded with a connection piece, and the lower end of the negative electrode post needs to be welded with a connection piece. There will be virtual welding or over-welding of the positive and negative connection pieces, resulting in a high internal resistance and unstable voltage of the battery. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problems raised in the above background art, and to propose a square aluminum shell lithium-ion battery cover plate.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A square aluminum shell lithium-ion battery cover plate, comprising: a lower plastic plate; a cover plate member attached to the lower plastic plate; a positive electrode post and a negative electrode post symmetrically arranged on the lower plastic plate; wherein, the positive electrode post and the negative electrode post both include a post member, and a connection piece is integrally formed at the lower end of the post member.

[0008] Preferably, a limiting hole is provided on the post member, and a lower plastic part is further included. A limiting rod is inserted into the lower plastic part, and the limiting rod is matched with the limiting hole.

[0009] Preferably, the limiting rod is in interference fit with the lower plastic part.

[0010] Preferably, a sealing ring is provided between the pole column part and the cover plate part.

[0011] Preferably, the cover plate part and the lower plastic part are provided with through liquid injection holes.

[0012] Preferably, a traceability code is provided on the cover plate part.

[0013] Preferably, an explosion-proof sealing piece is provided on the cover plate part, and an explosion-proof valve is provided on the lower plastic part.

[0014] Compared with the prior art, the present utility model provides a cover plate for a square aluminum shell lithium-ion battery, having the following beneficial effects:

[0015] For the parts not involved in this device, they are the same as or can be implemented by the prior art. By adopting an integrally formed method, the positive pole column and the negative pole column are cast, reducing the manufacturing cycle of the battery, reducing the internal resistance and the temperature rise on the surface of the battery, increasing the current-carrying area of the current collector, reducing the interface resistance of the battery, and improving the safety factor of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a cover plate for a square aluminum shell lithium-ion battery proposed by the present utility model Figure 1 ;

[0017] Figure 2 is a schematic structural diagram of a cover plate for a square aluminum shell lithium-ion battery proposed by the present utility model Figure 2 ;

[0018] Figure 3 is a schematic structural diagram of the lower plastic part of a cover plate for a square aluminum shell lithium-ion battery proposed by the present utility model;

[0019] Figure 4 is a schematic cross-sectional structural diagram of a cover plate for a square aluminum shell lithium-ion battery proposed by the present utility model;

[0020] Figure 5 is a schematic structural diagram of the pole column part of a cover plate for a square aluminum shell lithium-ion battery proposed by the present utility model.

[0021] In the figure: 1, cover plate part; 2, lower plastic part; 3, positive pole column; 4, negative pole column; 5, pole column part; 501, connecting piece; 502, sealing ring; 503, limiting hole; 504, limiting rod; 6, liquid injection hole; 601, explosion-proof sealing piece; 602, traceability code; 603, explosion-proof valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0023] Embodiment 1:

[0024] Referring to Figures 1-5 , a square aluminum shell lithium-ion battery cover plate includes: a lower plastic plate 7, and the lower plastic part can be made of high-temperature resistant materials such as yellow polyimide, polyimide, polytetrafluoroethylene, and polyether ether ketone; a cover plate part 1 attached to the lower plastic plate 7, made of aluminum material; a positive electrode post 3 and a negative electrode post 4 symmetrically arranged on the lower plastic plate 7; wherein, both the positive electrode post 3 and the negative electrode post 4 include a post part 5, and a connecting piece 501 is integrally formed at the lower end of the post part 5. Specifically, the positive electrode post 3 is made of aluminum or aluminum alloy material, and the negative electrode post 4 is made of composite metal materials such as copper-nickel alloy or aluminum-nickel alloy. The post part 5 and the connecting piece 501 are cast integrally by calcination. The one-piece forming method can shorten the battery manufacturing cycle, reduce the battery internal resistance and the battery surface temperature rise, increase the current-carrying area of the current collector, reduce the battery interface resistance, and improve the battery safety factor.

[0025] A limiting hole 503 is provided on the post part 5, and a limiting rod 504 is inserted into the lower plastic part 2, and the limiting rod 504 matches the limiting hole 503;

[0026] By providing the limiting rod 504, it is convenient to fix the post part 5 on the lower plastic part 2.

[0027] The limiting rod 504 is in interference fit with the lower plastic part 2, which can ensure the stability of the limit.

[0028] A sealing ring 502 is provided between the post part 5 and the cover plate part 1.

[0029] The cover plate part 1 and the lower plastic part 2 are provided with a through liquid injection hole 6.

[0030] A traceability code 602 is provided on the cover plate part 1.

[0031] An explosion-proof sealing piece 601 is provided on the cover plate part 1, and an explosion-proof valve 603 is provided on the lower plastic part 2. When a safety hazard occurs in the battery, it can explode from the explosion-proof valve, reduce the internal pressure of the battery, and prevent the battery from catching fire.

[0032] The present utility model casts the positive electrode post 3 and the negative electrode post 4 by an integral forming method, reduces the battery manufacturing cycle, reduces the battery internal resistance and the battery surface temperature rise, increases the current-carrying area of the current collector, reduces the battery interface resistance, and improves the battery safety factor.

[0033] The above are only the preferred specific embodiments 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, making equivalent substitutions or changes should be covered within the protection scope of the present utility model.

Claims

1. A square aluminum shell lithium ion battery cover, characterized in that: include: Lower plastic plate (7); A cover plate member (1) attached to the lower plastic plate (7); A positive electrode column (3) and a negative electrode column (4) symmetrically arranged on the lower plastic plate (7); Wherein, the positive electrode column (3) and the negative electrode column (4) both comprise a column piece (5), and a connecting piece (501) is integrally formed at the lower end of the column piece (5); The pole piece (5) is provided with a limiting hole (503), and further comprises a lower plastic piece (2), wherein a limiting rod (504) is inserted into the lower plastic piece (2), and the limiting rod (504) matches the limiting hole (503); The limiting rod (504) is interference fit with the lower plastic part (2).

2. The square aluminum shell lithium ion battery cover plate according to claim 1, characterized in that: A sealing ring (502) is provided between the pole piece (5) and the cover plate piece (1).

3. The square aluminum shell lithium ion battery cover plate according to claim 1, characterized in that: The cover plate component (1) and the lower plastic component (2) are provided with a through injection hole (6).

4. The square aluminum shell lithium ion battery cover plate according to claim 1, characterized in that: The cover plate (1) is provided with a traceability code (602).

5. The square aluminum shell lithium ion battery cover plate according to claim 1, characterized in that: The cover plate (1) is provided with an explosion-proof sealing sheet (601), and the lower plastic part (2) is provided with an explosion-proof valve (603).

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