Cylindrical battery

Abstract

The utility model provides a cylindrical battery, which relates to the technical field of batteries and comprises an anode top cover, the anode top cover comprises an anode connecting piece, anode lower plastic, an anode cover piece and a sealing piece, the anode cover piece is provided with an anode pole and a liquid injection hole, the liquid injection hole is arranged at the central position of the anode cover piece, and the anode connecting piece is connected with the anode connecting piece. And the sealing piece is used for sealing the liquid injection hole. The liquid injection hole is formed in the central position of the positive electrode cover plate, so that the influence of a roll core on liquid injection is reduced, the liquid injection efficiency is improved, electrolyte diffusion is more uniform, and the service life of the battery is prolonged; the positive aluminum cover plate is provided with a convex structure to serve as a positive pole, so that the design of the positive pole is avoided, and the manufacturing process of the positive top cover is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cylindrical battery. Background Art

[0002] The current cylindrical battery shell is a double-pass type, and the traditional design structure occupies most of the space. The injection hole can only be designed near the aluminum shell. Since the cylindrical core is relatively dense, injection is relatively difficult. After injection, it is easy to cause insufficient diffusion of the electrolyte, affecting the battery life and injection efficiency. In view of the above defects, this application is proposed. Utility Model Content

[0003] The utility model aims to provide a cylindrical battery, which solves the problem that the electrolyte is not fully diffused after injection due to the injection hole being close to the side wall of the aluminum shell, thus affecting the battery life and injection efficiency.

[0004] To solve the above problems, the utility model provides a cylindrical battery, including a positive top cover, the positive top cover includes a positive connecting plate, a positive lower plastic, a positive cover plate and a seal, the positive cover plate is provided with a positive electrode column and a liquid injection hole, the liquid injection hole is arranged at the center of the positive cover plate, and the seal is used to close the liquid injection hole.

[0005] According to an embodiment of the utility model, an explosion-proof valve is installed on the positive electrode cover.

[0006] According to an embodiment of the utility model, a film is provided at the explosion-proof valve.

[0007] According to an embodiment of the utility model, a countersunk hole is provided on the positive electrode cover sheet, and the sealing member is installed in the countersunk hole.

[0008] According to an embodiment of the present invention, the sealing member is an aluminum nail.

[0009] According to an embodiment of the present invention, the sealing member is connected to the positive electrode cover by welding.

[0010] According to an embodiment of the utility model, the positive electrode column is a protruding structure arranged on the positive electrode cover plate, and the positive electrode column is arranged at the center position of the positive electrode cover plate.

[0011] According to an embodiment of the utility model, the cylindrical battery further includes a negative electrode top cover, and the negative electrode top cover includes a negative electrode connecting sheet, a negative electrode lower plastic, a negative electrode cover sheet, a negative electrode column, an upper plastic and a riveting block.

[0012] According to an embodiment of the utility model, the negative electrode cover sheet and the negative electrode lower plastic are matched with each other through an anti-rotation positioning structure, and the negative electrode lower plastic and the riveting block are matched with each other through an anti-rotation positioning structure.

[0013] According to an embodiment of the present invention, a positioning structure is provided between the negative electrode connecting sheet and the negative electrode lower plastic.

[0014] The beneficial effects of the utility model are as follows: by setting the injection hole at the center of the positive electrode cover, the influence of the winding core on the injection is reduced, the injection efficiency is improved, the electrolyte diffusion is more uniform, and the battery life is improved; the positive electrode aluminum cover is designed with a raised structure to act as the positive electrode column, avoiding the design of the positive electrode column, simplifying the manufacturing process of the positive electrode top cover, avoiding the riveting process of the positive electrode top cover molding, reducing the production cost of the positive electrode top cover and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic diagram of the overall structure of a cylindrical battery;

[0017] Figure 2 is a cross-sectional view of a cylindrical battery;

[0018] Figure 3 It is a schematic diagram of the structure from the bottom perspective of the positive electrode top cover and the negative electrode top cover;

[0019] Figure 4 It is a schematic diagram of the structure of the positive electrode top cover and the negative electrode top cover from the top perspective;

[0020] Figure 5 It is a schematic diagram of the explosion of the positive electrode top cover and the negative electrode top cover;

[0021] Figure 6 Schematic diagram of the explosion of the negative electrode top cover. DETAILED DESCRIPTION

[0022] The following description is only used to disclose the utility model so that those skilled in the art can implement the utility model. The embodiments described below are only for example, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not deviate from the spirit and scope of the utility model.

[0023] A cylindrical battery, such as Figure 1 , Figure 2 , including a positive electrode top cover 1, a battery cell assembly and a negative electrode top cover 3, the battery cell assembly includes a shell 2 and a winding core 4, the shell 2 is generally made of aluminum shell, such as Figure 3-Figure 5The positive electrode top cover 1 includes a positive electrode connecting sheet 14, a positive electrode lower plastic 13, a positive electrode cover sheet 12 and a sealing member 11. The positive electrode cover sheet 12 is generally made of an aluminum cover sheet. A positive electrode column 17 and a liquid injection hole 18 are provided on the positive electrode cover sheet 12. The liquid injection hole 18 is arranged at the center of the positive electrode cover sheet 12 and is on the same axis as the center of the winding core 4. The sealing member 11 is used to close the liquid injection hole 18.

[0024] An explosion-proof valve 16 is installed on the positive electrode cover 12 .

[0025] The explosion-proof valve 16 is provided with a film 15, and the function of the film 15 is to prevent the explosion-proof valve from being dirty.

[0026] Preferably, a countersunk hole is provided on the positive electrode cover sheet 12, and the seal 11 is installed in the countersunk hole so that the top surface of the seal 11 does not exceed the height of the positive electrode column. In this embodiment, the seal 11 is an aluminum nail, and the positive electrode column 17 is a protruding structure arranged on the positive electrode cover sheet 12, and the positive electrode column 17 is arranged at the center position of the positive electrode cover sheet 12.

[0027] Positive electrode top cover assembly process: explosion-proof valve 16 is welded to positive electrode aluminum cover sheet, positive electrode lower plastic 13 is ultrasonically welded to positive electrode cover sheet 12, positive electrode connecting sheet 14 is welded to positive electrode pole 17, and by setting the injection hole 18 at the center of the positive electrode cover sheet 12, the influence of the winding core on the injection is reduced, the injection efficiency is improved, the electrolyte diffusion is more uniform, and the battery life is improved; the positive electrode aluminum cover sheet is designed with a raised structure to act as the positive electrode pole, avoiding the design of the positive electrode pole, simplifying the manufacturing process of the positive electrode top cover, avoiding the riveting process of the positive electrode top cover molding, reducing the production cost of the positive electrode top cover and improving production efficiency.

[0028] Furthermore, the cylindrical battery further comprises a negative electrode top cover 3, the negative electrode top cover 3 comprises a negative electrode connecting sheet 36, a negative electrode lower plastic 35, a negative electrode cover sheet 34, a negative electrode column 32, an upper plastic 33 and a riveting block 31, the negative electrode cover sheet 34 is generally made of an aluminum cover sheet, the negative electrode top cover 3 and the negative electrode lower plastic 35 are matched by an anti-rotation positioning structure, and the negative electrode lower plastic 35 and the riveting block 31 are matched by an anti-rotation positioning structure, such as Figure 3 The anti-rotation positioning structure includes square grooves on both the negative electrode cover sheet 34 and the upper plastic 33, a bevel is provided at one corner of the square groove, and a bevel 37 is provided on both the upper plastic 33 and the rivet block 31. The upper plastic 33 is installed in the square groove of the negative electrode cover sheet 34, and the rivet block 31 is installed in the square groove of the upper plastic 33.

[0029] The anti-rotation positioning structure plays the role of stopping rotation and positioning.

[0030] Negative electrode top cover assembly process: negative electrode cover sheet 34, negative electrode lower plastic 35, negative electrode column 32, upper plastic 33, and riveting block 31 are assembled and riveted, and finally the negative electrode connecting sheet 36 is welded to the negative electrode column 32. The negative electrode connecting sheet 36 is designed with a positioning structure, such as Figure 5 , Figure 6 The positioning structure includes a contoured structure 37 arranged on the negative electrode lower plastic 35 and a positioning protrusion 38 arranged on the negative electrode connecting piece 36. When assembling, it is positioned with the negative electrode lower plastic 35 to avoid rotation during riveting, which is not conducive to the assembly of the battery cell in the subsequent process.

[0031] After assembling the winding core 4 to the aluminum shell 2, the negative electrode connecting piece 36 of the negative electrode top cover 3 is welded to the winding core 4, the negative electrode cover piece 34 is welded to the aluminum shell 2, the positive electrode connecting piece 14 of the positive electrode top cover is welded to the winding core 4, and the positive electrode cover piece 12 is welded to the aluminum shell. After liquid injection, the sealing aluminum nail is welded and sealed at the position of the liquid injection hole 18.

[0032] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the embodiments of the present invention may be deformed and modified in any way.

Claims

1. A cylindrical battery, characterized in that: The invention comprises a positive electrode top cover (1), wherein the positive electrode top cover (1) comprises a positive electrode connecting sheet (14), a positive electrode lower plastic (13), a positive electrode cover sheet (12) and a sealing member (11); a positive electrode column (17) and a liquid injection hole (18) are arranged on the positive electrode cover sheet (12); the liquid injection hole (18) is arranged at the center of the positive electrode cover sheet (12); and the sealing member (11) is used to close the liquid injection hole (18).

2. The cylindrical battery according to claim 1, characterized in that: An explosion-proof valve (16) is installed on the positive electrode cover sheet (12).

3. The cylindrical battery according to claim 2, characterized in that: The explosion-proof valve (16) is provided with a film (15).

4. The cylindrical battery according to any one of claims 1 to 3, characterized in that: The positive electrode cover sheet (12) is provided with a countersunk hole, and the sealing member (11) is installed in the countersunk hole.

5. The cylindrical battery according to claim 4, characterized in that: The sealing member (11) is an aluminum nail.

6. The cylindrical battery according to claim 5, characterized in that: The sealing member (11) is connected to the positive electrode cover sheet (12) by welding.

7. The cylindrical battery according to claim 6, characterized in that: The positive electrode column (17) is a protruding structure arranged on the positive electrode cover sheet (12), and the positive electrode column (17) is arranged at the center position of the positive electrode cover sheet (12).

8. The cylindrical battery according to claim 7, characterized in that: The cylindrical battery also includes a negative electrode top cover (3), wherein the negative electrode top cover (3) includes a negative electrode connecting sheet (36), a negative electrode lower plastic (35), a negative electrode cover sheet (34), a negative electrode column (32), an upper plastic (33) and a riveting block (31).

9. The cylindrical battery according to claim 8, characterized in that: The negative electrode cover sheet (34) and the negative electrode lower plastic (35) are matched via an anti-rotation positioning structure, and the negative electrode lower plastic (35) and the riveting block (31) are matched via an anti-rotation positioning structure.

10. The cylindrical battery according to claim 8 or 9, characterized in that: A positioning structure is provided between the negative electrode connecting sheet (36) and the negative electrode lower plastic (35).

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