Square battery cover plate capable of being externally welded with current collector

Abstract

The utility model discloses a square battery cover plate capable of being externally welded with a current collector, which relates to the technical field of battery cover plates, and has the technical scheme that the square battery cover plate comprises a cover plate, two mounting holes are formed in the cover plate, terminal external connecting pieces are arranged in the two mounting holes, a sealing piece with a C-shaped section is arranged on the inner wall of each mounting hole, and a current collector is arranged in the sealing piece. The inner wall of the mounting hole is located in the opening of the sealing piece, the other face of the sealing piece abuts against the outer wall of the terminal external connection piece, the outer side of the cover plate is fixedly connected with an insulating piece, and the insulating piece is fixedly connected with the end, extending out of the cover plate, of the sealing piece. Through the arrangement of the structure, the insulation performance and the sealing performance are synchronously improved, and meanwhile the weight reduction effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cover plates, and more specifically, to a square battery cover plate capable of welding a current collector on the outside. Background Art

[0002] Lithium-ion batteries have been widely used in many mobile devices in the defense, industrial and civilian fields due to their advantages such as high energy density, small size, long service life and low self-discharge. The cover plate is an important component of lithium-ion batteries, which carries important functions such as electrical conduction and sealing.

[0003] In the prior art, battery covers in the industry are generally made of aluminum plates, which are heavy and are usually connected to the sealing rings by riveting. This method not only adds riveted parts to further increase the weight of the battery cover, but also forms a clumsy sealing structure. The current collector needs to be welded from the inside to the terminal surface, and the welding points have safety hazards. After long-term use, the aging of the sealing ring is also likely to lead to a decrease in sealing performance, affecting the quality and safety of the product.

[0004] Therefore, it is necessary to provide a square battery cover plate to which a current collector can be welded on the outside to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a square battery cover plate with a current collector welded on the outside, so as to solve the problems raised in the above-mentioned background technology.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A square battery cover plate capable of welding a current collector on the outside comprises a cover plate, wherein two mounting holes are provided on the cover plate, and terminal external connectors are provided in both mounting holes. A sealing member with a C-shaped cross-section is provided on the inner wall of the mounting hole, and the inner wall of the mounting hole is located in the opening of the sealing member, and the other side of the sealing member abuts against the outer wall of the terminal external connector. An insulating member is fixedly connected to the outer side of the cover plate, and the insulating member is fixedly connected to one end of the sealing member extending out of the cover plate.

[0008] The technical solution of the utility model is further configured as follows: an extension portion is fixedly connected to one end of the sealing member located on the outer side of the cover plate, and the height of the extension portion is lower than the height of the terminal external connection member.

[0009] The technical solution of the utility model is further configured as follows: the cross-sectional shape of the terminal external connection piece is concave and a rounded corner is provided at one end thereof facing the inside of the cover plate; a contact portion is fixedly connected to one end of the sealing piece located on the inner side of the cover plate, and the contact portion fits with the rounded corner on the terminal external connection piece.

[0010] The technical solution of the present invention is further configured as follows: the sealing member, the insulating member, the extending portion and the contact portion are integrally formed.

[0011] The technical solution of the utility model is further configured as follows: the edges around the cover plate are bent upwards and cover the edges around the insulating member.

[0012] The technical solution of the utility model is further configured as follows: the cover plate and the two terminal external connection parts are both subjected to nano-modification treatment.

[0013] The technical solution of the utility model is further configured as follows: the sealing member, the insulating member, the extending portion and the contact portion are all made of PPS material.

[0014] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0015] Through mold injection molding, the seal and the insulating part are made into a whole, so that the seal can fix the terminal external parts and complete the sealing of the connection at the same time, and there is no need to use riveting parts for fixing. While meeting the sealing and insulation requirements, the overall weight is reduced. Due to the use of PPS material, the seal and the insulating part have excellent high temperature resistance, corrosion resistance, radiation resistance, flame retardancy and other effects and excellent dimensional stability. The edges of the cover plate are bent upward to facilitate the welding of the cover plate and the battery shell.

[0016] In conventional technical means, the terminal external parts need to be welded to the current collector first, and then the cover plate and the battery casing are welded. This method has certain safety hazards. However, the present technical solution allows the welding of the terminal external parts and the current collector to be completed from the outside of the cover plate, eliminating the safety hazards during internal welding, ensuring the safety of the operation process while improving battery safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0018] Figure 2 The structure of the utility model is shown in FIG. Figure 2 ;

[0019] Figure 3 It is a schematic diagram of the structure of the cover plate and the terminal external connection parts in the utility model;

[0020] Figure 4 It is a cross-sectional view of the utility model;

[0021] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0022] In the figure: 1. Cover plate; 2. Mounting hole; 3. Terminal external part; 4. Sealing part; 5. Insulating part; 6. Extension part; 7. Fillet; 8. Contact part; 9. Explosion-proof valve; 10. Liquid injection hole. DETAILED DESCRIPTION

[0023] In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model. Example

[0024] like Figures 1 to 5 As shown, the utility model provides a square battery cover plate with a current collector that can be welded on the outside, including a cover plate 1 made of aluminum alloy, with two mounting holes 2 formed on the cover plate 1, and terminal external connectors 3 are provided in the two mounting holes 2, and a sealing member 4 with a C-shaped cross-section is provided on the inner wall of the mounting hole 2, the inner wall of the mounting hole 2 is located in the opening of the sealing member 4, and the other side of the sealing member 4 is against the outer wall of the terminal external connector 3, and an insulating member 5 is fixedly connected to the outer side of the cover plate 1, and the insulating member 5 is fixedly connected to one end of the sealing member 4 extending out of the cover plate 1.

[0025] like Figures 1 to 5 As shown, the cover plate 1 and the two terminal external parts 3 are nano-modified to enhance the sealing effect. The two terminal external parts 3 are divided into a positive terminal external part 3 and a negative terminal external part 3. The two mounting holes 2 are also divided into a positive mounting hole 2 and a negative mounting hole 2. An explosion-proof valve 9 and a liquid injection hole 10 are provided on the cover plate 1 between the positive mounting hole 2 and the negative mounting hole 2. The material of the positive terminal external part 3 is aluminum alloy, and the material of the negative terminal external part 3 is copper alloy.

[0026] like Figures 1 to 5 As shown, the sealing member 4 is fixedly connected to an extension portion 6 on one end located on the outer side of the cover plate 1, the height of the extension portion 6 is lower than the height of the terminal external component 3, the cross-sectional shape of the terminal external component 3 is concave and a rounded corner 7 is provided on the end facing the inside of the cover plate 1, and the sealing member 4 is fixedly connected to a contact portion 8 on one end located on the inner side of the cover plate 1, the contact portion 8 is fitted with the rounded corner 7 on the terminal external component 3, and the sealing member 4, the insulating member 5, the extension portion 6 and the contact portion 8 are all integrally formed by injection molding of PPS material.

[0027] Through the arrangement of the above-mentioned structure, the sealing member 4, the insulating member 5, the extension portion 6 and the contact portion 8 achieve the fixing effect of the terminal external component 3 while meeting its sealing requirements, thereby simultaneously improving the insulation and sealing properties, and the sealing member 4 is stably and firmly connected to the cover plate 1 to ensure its safety during use. This method makes the sealing area several times larger than that of a traditional sealing ring, and has excellent sealing performance, which can meet the He gas leakage rate of less than 1*10^-9Pa*m^3 / s, and is superior to the traditional sealing ring structure and has a longer service life.

[0028] like Figures 1 to 5 As shown, the edges of the cover plate 1 are bent upward and cover the edges of the insulating member 5, so that the cover plate 1 can be welded to the battery casing. The insulating member 5 replaces part of the metal structure of the cover plate 1 itself, thereby replacing steel with plastic. This not only meets the insulation requirements of the terminal external component 3, but also reduces the weight of the cover plate 1 itself, which is about 25% lighter than the traditional sealing ring riveting method.

[0029] like Figures 1 to 5 As shown, the cover plate 1 and two terminal external parts 3 that have undergone nano-modification treatment are placed in an injection mold. During the injection molding process, the PPS material enters the mounting hole 2 between the cover plate 1 and the terminal external parts 3, thereby forming a seal 4 that is integrated with the insulating part 5. After the injection molding is completed, the seal 4 seals the area between the cover plate 1 and the two terminal external parts 3, and at the same time limits the two terminal external parts 3, and then the two terminal external parts 3 can be welded to the collector from the outside.

[0030] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A square battery cover plate capable of welding a current collector on the outside, comprising a cover plate (1), characterized in that: The cover plate (1) is provided with two mounting holes (2), each of the two mounting holes (2) being provided with a terminal external connection part (3), the inner wall of the mounting hole (2) being provided with a sealing part (4) having a C-shaped cross-section, the inner wall of the mounting hole (2) being located within the opening of the sealing part (4), the other surface of the sealing part (4) being in contact with the outer wall of the terminal external connection part (3), the outer side of the cover plate (1) being fixedly connected with an insulating part (5), the insulating part (5) being fixedly connected to one end of the sealing part (4) extending out of the cover plate (1).

2. A square battery cover plate capable of welding a current collector on the outside according to claim 1, characterized in that: An extension portion (6) is fixedly connected to one end of the sealing member (4) located on the outside of the cover plate (1), and the height of the extension portion (6) is lower than the height of the terminal external connection member (3).

3. A square battery cover plate capable of externally welding a current collector according to claim 2, characterized in that: The cross-sectional shape of the terminal external connection part (3) is concave and a rounded corner (7) is provided at one end thereof facing the inside of the cover plate (1); a contact portion (8) is fixedly connected to one end of the sealing part (4) located on the inner side of the cover plate (1); the contact portion (8) fits in contact with the rounded corner (7) on the terminal external connection part (3).

4. A square battery cover plate capable of externally welding a current collector according to claim 3, characterized in that: The sealing component (4), the insulating component (5), the extending portion (6) and the contact portion (8) are integrally formed.

5. A square battery cover plate capable of welding a current collector on the outside according to claim 1, characterized in that: The edges around the cover plate (1) are bent upwards and cover the edges around the insulating member (5).

6. A square battery cover plate capable of welding a current collector on the outside according to claim 1, characterized in that: The cover plate (1) and the two terminal external connection parts (3) are all subjected to nano-modification treatment.

7. A square battery cover plate capable of welding a current collector on the outside according to claim 4, characterized in that: The sealing component (4), the insulating component (5), the extending portion (6) and the contact portion (8) are all made of PPS material.

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