Connecting structure for aluminum shell and upper cover of lithium battery

Abstract

A lithium battery aluminum shell and upper cover connecting structure belongs to the technical field of lithium battery production. The upper ends of the left and right inner side walls of the aluminum shell are correspondingly provided with short-edge clamping grooves along the front-back direction, and the upper ends of the front and right inner side walls of the aluminum shell are correspondingly provided with long-edge clamping grooves along the left-right direction; the left side wall and the right side wall of the cover plate are both provided with short-edge clamping tenons, and the front side wall and the rear side wall of the cover plate are both provided with long-edge clamping tenons. Each short-edge clamping tenon is in corresponding interference clamping connection with the corresponding short-edge clamping groove, and each long-edge clamping tenon is in corresponding interference clamping connection with the corresponding long-edge clamping groove. According to the utility model, accurate positioning and tight fitting of the upper cover and the aluminum shell in lithium battery assembly are realized through the mechanical locking structure, fitting consistency of the aluminum shell and the upper cover and high repeatability and high precision of mechanical fixation are ensured, welding defects caused by positioning deviation are completely eradicated from the source, the sealing welding yield is improved, and the production cost is reduced. The high efficiency and low cost of the lithium battery production process are realized, and the process stability and safety are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lithium battery aluminum shell and upper cover connecting structure belongs to lithium battery production technical field. BACKGROUND

[0002] In the lithium battery packaging process, the sealing welding needs to be ensured by pre-point welding before sealing welding to ensure that the aluminum shell and the upper cover are closely attached to improve the welding quality. However, the existing pre-point welding technology has significant technical bottlenecks: the optical components of the laser emitter and the galvanometer scanning system in the pre-point welding equipment have a service life limit and need to be replaced regularly to maintain processing accuracy, resulting in increased operation and maintenance costs; At the same time, the equipment needs to be configured with a high-power laser source and a precise transmission module, which requires high initial investment cost; In addition, the independent implementation of the spot welding process for each cell causes low laser energy utilization rate and waste of power resources; Moreover, due to the insufficient positioning accuracy of the equipment, manual secondary correction and forced clamping are often required, which not only reduces production efficiency, but also easily causes operator fatigue and quality fluctuations in the long run, resulting in significant process defects. SUMMARY

[0003] To solve the problems in the background art, the utility model provides a lithium battery aluminum shell and upper cover connecting structure.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a lithium battery aluminum shell and upper cover connecting structure, comprising an upper cover and an aluminum shell, the upper ends of the left and right inner side walls of the aluminum shell are provided with short side clamping grooves in the front-back direction, and the upper ends of the front and back inner side walls of the aluminum shell are provided with long side clamping grooves in the left-right direction; The left and right side walls of the upper cover are each provided with a short side clamping tongue, and the front and back side walls of the upper cover are each provided with a long side clamping tongue; Each short side clamping tongue is correspondingly interference-fitted with a corresponding short side clamping groove, and each long side clamping tongue is correspondingly interference-fitted with a corresponding long side clamping groove.

[0005] The upper cover comprises a positive electrode upper plastic, a positive electrode pole, a negative electrode upper plastic, a negative electrode pole, a lower plastic, a positive electrode pressing block, a positive electrode connecting piece, a negative electrode pressing block, a negative electrode connecting piece, and an upper cover body; The left and right sides of the upper end of the upper cover body are respectively provided with a positive electrode upper plastic and a negative electrode upper plastic, and the left and right sides of the lower end of the upper cover body are respectively provided with a positive electrode connecting piece and a negative electrode connecting piece; The lower end of the positive electrode connecting piece is provided with a positive electrode pressing block, and the lower end of the negative electrode connecting piece is provided with a negative electrode pressing block; The positive electrode pole is inserted into the positive electrode upper plastic, and the lower end of the positive electrode pole is sequentially connected with the positive electrode pressing block through the positive electrode upper plastic, the upper cover body, and the positive electrode connecting piece; The negative electrode pole is inserted into the negative electrode upper plastic, and the lower end of the negative electrode pole is sequentially connected with the negative electrode pressing block through the negative electrode upper plastic, the upper cover body, and the negative electrode connecting piece; The lower plastic is installed at the lower end edge of the upper cover body, the left and right side walls of the lower plastic are each provided with a short side clamping tongue, and the front and back side walls of the lower plastic are each provided with a long side clamping tongue; The upper surface of the upper cover body is provided with a liquid injection hole.

[0006] The sealing ring is arranged between the positive electrode upper plastic, the negative electrode upper plastic and the upper cover body.

[0007] The middle part of the upper surface of the upper cover body is provided with an explosion-proof valve protection patch, and the middle part of the lower surface of the upper cover body is provided with an explosion-proof valve.

[0008] The side wall of the aluminum shell is provided with a plurality of explosion-proof grooves.

[0009] Compared with the prior art, the utility model has the beneficial effects that:

[0010] The mechanical locking structure is used for realizing the accurate positioning and close adhesion of the upper cover and the aluminum shell in the lithium battery assembly, ensuring the consistency of the adhesion of the aluminum shell and the upper cover, the high repeatability and high precision characteristics of mechanical fixation, eliminating the welding defects caused by the positioning deviation from the source, effectively improving the sealing welding yield, saving the traditional pre-point welding process, avoiding the high cost and high maintenance drawbacks of the laser equipment, eliminating the complicated operation of manual cover buckling, significantly reducing the equipment investment, energy consumption and labor cost, realizing the high efficiency and low cost of the lithium battery production process, and having the process stability and safety. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a structural schematic view of the utility model;

[0012] Figure 2 is a side view of Figure 1 ;

[0013] Figure 3 is a structural schematic view of the upper cover;

[0014] Figure 4 is a top view of Figure 3 ;

[0015] Figure 5 is a bottom view of Figure 3 . DETAILED DESCRIPTION

[0016] The technical solutions in the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0017] The utility model provides a lithium battery aluminum shell and upper cover connecting structure, including upper cover 1 and aluminum shell 17, the upper end of left and right inner side wall of aluminum shell 17 is correspondingly provided with short side clamping groove 15 along front and back direction, and the upper end of front and back inner side wall of aluminum shell 17 is correspondingly provided with long side clamping groove 19 along left and right direction, the left and right side wall of upper cover 1 is provided with short side clamping tongue 14, and the front and back side wall of upper cover 1 is provided with long side clamping tongue 18, every short side clamping tongue 14 is respectively with corresponding short side clamping groove 15 corresponding interference joint, and every long side clamping tongue 18 is respectively with corresponding long side clamping groove 19 corresponding interference joint, realizes the accurate positioning and mechanical lock of aluminum shell 17 and upper cover 1.

[0018] The upper cover 1 includes a positive electrode upper plastic 2, a positive electrode pole 3, a negative electrode upper plastic 5, a negative electrode pole 6, a lower plastic 7, a positive electrode pressing block 9, a positive electrode connecting piece 10, a negative electrode pressing block 12, a negative electrode connecting piece 13, and an upper cover body; the left and right sides of the upper end of the upper cover body are respectively provided with the positive electrode upper plastic 2 and the negative electrode upper plastic 5, the left and right sides of the lower end of the upper cover body are respectively provided with the positive electrode connecting piece 10 and the negative electrode connecting piece 13, the lower end of the positive electrode connecting piece 10 is provided with the positive electrode pressing block 9, and the lower end of the negative electrode connecting piece 13 is provided with the negative electrode pressing block 12; the positive electrode pole 3 is inserted into the positive electrode upper plastic 2, and the lower end of the positive electrode pole 3 is sequentially connected with the positive electrode pressing block 9 after penetrating through the positive electrode upper plastic 2, the upper cover body, and the positive electrode connecting piece 10; the negative electrode pole 6 is inserted into the negative electrode upper plastic 5, and the lower end of the negative electrode pole 6 is sequentially connected with the negative electrode pressing block 12 after penetrating through the negative electrode upper plastic 5, the upper cover body, and the negative electrode connecting piece 13; the lower plastic 7 is arranged at the edge of the lower end of the upper cover body along the circumferential direction, the left and right side walls of the lower plastic 7 are integrally provided with the short side clamping tongue 14, and the front and back side walls of the lower plastic 7 are integrally provided with the long side clamping tongue 18; the upper surface of the upper cover body is provided with a liquid injection hole 20 penetrating through the thickness direction.

[0019] The positive electrode upper plastic 2 and the negative electrode upper plastic 5 are provided with a sealing ring 8 between the upper cover body.

[0020] The middle part of the upper surface of the upper cover body is provided with an explosion-proof valve protection patch 4, the middle part of the lower surface of the upper cover body is provided with an explosion-proof valve 11, and the explosion-proof valve protection patch 4 is arranged corresponding to the explosion-proof valve 11.

[0021] The side wall of the aluminum shell 17 is provided with a plurality of explosion-proof grooves 16 penetrating through the thickness direction.

[0022] When the internal pressure exceeds the design threshold, the explosion-proof valve 11 will be opened under the action of pressure, and the pressure will be released through the explosion-proof groove 16, so as to effectively prevent safety accidents caused by high pressure, ensure the safety and reliability of the battery structure, and realize efficient assembly and multiple safety protection.

[0023] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other forms without deviating from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than that of the above description, and it is therefore intended that all changes that come within the meaning and range of equivalents of the claims are to be embraced within the application. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0024] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment according to the present specification needs to exhibit each and every characteristic specified in the present specification. The specification can also be described in terms of a single preferred embodiment, it being understood that this single preferred embodiment can exhibit not every aspect or feature of the present specification. The specification can also be described in terms of a generic statement that the disclosure can include one, some, or all examples of a particular feature or aspect as described, and vice versa.

Claims

1. A connection structure between an aluminum casing and a top cover for a lithium battery, comprising a top cover (1) and an aluminum casing (17); characterized in that: The upper ends of the left and right inner sidewalls of the aluminum shell (17) are provided with short side slots (15) in the front-back direction, and the upper ends of the front and rear inner sidewalls of the aluminum shell (17) are provided with long side slots (19) in the left-right direction; the left and right sidewalls of the upper cover (1) are provided with short side tenons (14), and the front and rear sidewalls of the upper cover (1) are provided with long side tenons (18); each short side tenon (14) is respectively interference-fitted with the corresponding short side slot (15), and each long side tenon (18) is respectively interference-fitted with the corresponding long side slot (19).

2. The connection structure between the aluminum shell and the top cover of a lithium battery according to claim 1, characterized in that: The upper cover (1) includes a positive electrode upper plastic (2), a positive electrode post (3), a negative electrode upper plastic (5), a negative electrode post (6), a lower plastic (7), a positive electrode pressure block (9), a positive electrode connecting piece (10), a negative electrode pressure block (12), a negative electrode connecting piece (13), and an upper cover body; the positive electrode upper plastic (2) and the negative electrode upper plastic (5) are respectively installed on the left and right sides of the upper end of the upper cover body, and the positive electrode connecting piece (10) and the negative electrode connecting piece (13) are respectively installed on the left and right sides of the lower end of the upper cover body. The positive electrode pressure block (9) is installed at the lower end of the positive electrode connecting piece (10), and the negative electrode pressure block (12) is installed at the lower end of the negative electrode connecting piece (13); the positive electrode upper plastic (2) A positive electrode post (3) is inserted into the upper plastic (2), the upper cover body and the positive electrode connecting piece (10) are passed through the positive electrode upper plastic (2), the upper cover body and the positive electrode connecting piece (10) in sequence and then fixedly connected to the positive electrode pressure block (9); a negative electrode post (6) is inserted into the upper plastic (5), the lower end of the negative electrode post (6) is passed through the upper plastic (5), the upper cover body and the negative electrode connecting piece (13) in sequence and then fixedly connected to the negative electrode pressure block (12); a lower plastic (7) is installed at the lower edge of the upper cover body, the left and right side walls of the lower plastic (7) are provided with short side tenons (14) and the front and rear side walls of the lower plastic (7) are provided with long side tenons (18); the upper surface of the upper cover body is provided with a liquid injection hole (20).

3. The connection structure between the aluminum casing and the top cover of a lithium battery according to claim 2, characterized in that: A sealing ring (8) is installed between the plastic on the positive electrode (2) and the plastic on the negative electrode (5) and the upper cover body.

4. The connection structure between the aluminum casing and the top cover of a lithium battery according to claim 2 or 3, characterized in that: An explosion-proof valve protection patch (4) is provided in the middle of the upper surface of the upper cover body, and an explosion-proof valve (11) is provided in the middle of the lower surface of the upper cover body. The explosion-proof valve protection patch (4) and the explosion-proof valve (11) are respectively arranged.

5. The connection structure between the aluminum casing and the top cover of a lithium battery according to claim 4, characterized in that: The side wall of the aluminum shell (17) is provided with multiple explosion-proof grooves (16).

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