Cathode cover plate structure of square lithium ion battery with eccentric rivet poles

Abstract

The utility model relates to the technical field of lithium ion batteries, and particularly discloses an eccentric rivet pole lithium ion square battery cathode cover plate structure which comprises a cover plate, a convex block is arranged on one side of the upper end of the cover plate, a round hole is formed in the upper end of the convex block, and a liquid injection hole and an anti-explosion hole are respectively formed in the upper end of the cover plate; a negative square end plate is arranged at the upper end of the cover plate, a mounting hole is formed in the upper end of the negative square end plate, the section of the mounting hole is in an inverted convex shape, a negative column rivet structure is arranged at the lower end of the cover plate, a negative column is fixedly mounted on one side of the upper end of a negative square table of the negative column rivet structure, and a sealing ring sleeves the outer end of the negative column. The upper end of the negative pole cylinder sequentially penetrates through the cover plate and the negative pole square end plate. The riveting eccentric structure can well consider different types of pole lugs, enhance the compatibility between structural parts, reduce the mold opening cost, increase the welding area of the connecting piece, enhance the output channel of the battery and improve the output efficiency of the battery.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, specifically to an eccentric rivet electrode post negative electrode cover structure for a square lithium-ion battery. Background Technology

[0002] Lithium-ion batteries are widely used in energy storage systems, military equipment, and aerospace. With the continuous expansion of applications, the demand for battery energy is gradually increasing. The terminal lead-out method can flexibly adapt to different application scenarios and needs, while also considering high energy density and long cycle life. Facing a changing market environment, battery structure is fundamental to ensuring battery energy transfer and safe use. Under the premise of ensuring battery safety, structural consistency and compatibility have become important aspects of battery development; developing highly compatible structural components can significantly shorten battery development time. As a core component of the structural system, the composite cover plate's compatibility is particularly important. The compatibility of the terminal lead-out method has become a key focus in cover plate design.

[0003] Currently, the lead-out methods for electrode structures mainly include screw and nut connection type and rivet punching type. The structure is complicated, with many parts, and may loosen under harsh working conditions, causing leakage risks. When the electrode plate and the electrode tab are not collinear, the copper plate welded to the connecting piece at the lower end of the cover plate becomes eccentric, and the structure is prone to loosening, causing the welded connecting piece to shift towards the electrode tab, resulting in damage to the electrode tab. Utility Model Content

[0004] The purpose of this invention is to provide an eccentric rivet electrode post negative electrode cover structure for a lithium-ion square battery, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an eccentric rivet terminal lithium-ion square battery negative electrode cover plate structure, comprising: a cover plate, wherein a protrusion is provided on one side of the upper end of the cover plate, a round hole is provided at the upper end of the protrusion, and an injection hole and an explosion-proof hole are respectively provided at the upper end of the cover plate.

[0006] The upper end of the cover plate is provided with a negative electrode square end plate, and the upper end of the negative electrode square end plate is provided with an installation hole. The cross-section of the installation hole is convex. The lower end of the cover plate is provided with a negative electrode post rivet structure, which is a negative electrode square platform. The negative electrode cylinder is fixedly installed on one side of the upper end of the negative electrode square platform. A sealing ring is sleeved on the outer end of the negative electrode cylinder. The upper end of the negative electrode cylinder passes through the cover plate and the negative electrode square end plate in sequence.

[0007] Preferably, the negative electrode square end plate has diagonal limit holes at both ends, the cover plate has a limit groove on one side of the lower end, and the positive electrode post is fixedly installed on the other side of the upper end of the cover plate.

[0008] Preferably, a sealing aluminum cap is fixedly installed inside the injection hole.

[0009] Preferably, an explosion-proof film is adhered to the upper end of the explosion-proof hole, and an explosion-proof patch is fixedly installed at the lower end.

[0010] Preferably, the negative electrode square platform and the negative electrode cylinder are integrally formed, and the negative electrode square platform and the negative electrode cylinder have an eccentric structure.

[0011] Preferably, an upper insulating injection molded part is injection molded between the negative electrode square end plate and the cover plate using an injection molding machine. The upper insulating injection molded part wraps around the lower end and the surrounding area of ​​the negative electrode square end plate, and an upper positioning cylinder is formed on the upper insulating injection molded part and mates with the limiting hole.

[0012] Preferably, a negative electrode lower insulating injection molded part is injection molded between the negative electrode square platform and the cover plate by an injection molding machine. The negative electrode lower insulating injection molded part wraps around the upper end and the surrounding area of ​​the negative electrode square platform, and a lower positioning cylinder is formed on the negative electrode cylinder and cooperates with the limiting groove.

[0013] Preferably, the negative electrode square platform and the negative electrode cylinder are made of copper.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model discloses a negative electrode post riveting structure for an eccentric rivet post lithium-ion square battery negative electrode cover plate structure. The negative electrode post is riveted to the negative electrode square end plate and the cover plate using a pneumatic riveting machine, eliminating the need for laser welding, thus saving welding costs and the risk of leakage after welding.

[0016] 2. The negative electrode post riveting structure of the eccentric rivet post lithium-ion square battery negative electrode cover plate structure of this utility model has an eccentric square platform at the lower end. This structure can better accommodate different electrode tab widths, improve the compatibility of cover plates and other structural components, and save mold opening expenses.

[0017] 3. The negative electrode post riveting structure in the eccentric rivet post lithium-ion square battery negative electrode cover plate structure of this utility model is an integral type, which can enhance the connection strength, improve the sealing performance, and facilitate assembly. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a side view of the overall structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the overall structure of this utility model in an exploded view.

[0021] Figure 4 This is a schematic diagram of the second exploded structure of the overall structure of this utility model.

[0022] In the diagram: 1. Positive electrode post; 2. Cover plate; 3. Injection hole; 4. Sealing aluminum cap; 5. Explosion-proof hole; 6. Explosion-proof membrane; 7. Explosion-proof patch; 8. Protrusion; 9. Round hole; 10. Negative electrode square end plate; 11. Mounting hole; 12. Limiting hole; 13. Negative electrode square platform; 14. Negative electrode cylinder; 15. Sealing ring; 16. Limiting groove; 17. Upper insulating injection molded part of negative electrode; 18. Upper positioning cylinder; 19. Lower insulating injection molded part of negative electrode; 20. Lower positioning cylinder. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] Please see Figures 1-4 This utility model provides a technical solution: an eccentric riveted terminal block lithium-ion square battery negative electrode cover structure, including: a cover plate 2, a protrusion 8 is provided on one side of the upper end of the cover plate 2, a round hole 9 is opened at the upper end of the protrusion 8, the protrusion 8 is stamped and formed, and the round hole 9 facilitates the passage of the negative electrode cylinder 14, a positive electrode cylinder 1 is fixedly installed on the other side of the upper end of the cover plate 2, an injection hole 3 and an explosion-proof hole 5 are respectively opened at the upper end of the cover plate 2, a sealing aluminum cap 4 is fixedly installed in the injection hole 3, an explosion-proof film 6 is bonded to the upper end of the explosion-proof hole 5, and an explosion-proof patch 7 is fixedly installed at the lower end.

[0025] The upper end of the cover plate 2 is provided with a negative electrode square end plate 10. The upper end of the negative electrode square end plate 10 has a mounting hole 11. The cross-section of the mounting hole 11 is inverted convex. After riveting, the negative electrode cylinder 14 forms an inverted rounded platform that fits the upper part of the mounting hole 11 of the negative electrode square end plate 10. The lower end of the cover plate 2 is provided with a negative electrode post rivet structure, which includes a negative electrode square platform 13. The negative electrode cylinder 14 is fixedly installed on one side of the upper end of the negative electrode square platform 13. The negative electrode square platform 13 and the negative electrode cylinder 14 are integrally formed, and the negative electrode square platform 13 and the negative electrode cylinder 14 are at an angle... The eccentric structure, the negative electrode square platform 13 and the negative electrode cylinder 14 are made of copper. The outer end of the negative electrode cylinder 14 is fitted with a sealing ring 15, which serves to seal and insulate between the negative electrode column rivet structure and the cover plate 2. The upper end of the negative electrode cylinder 14 passes through the cover plate 2 and the negative electrode square end plate 10 in sequence. Then, a pneumatic riveting machine is used to rivet the negative electrode cylinder 14 from the top. After riveting, the negative electrode cylinder 14 forms an inverted circular platform that matches the upper part of the mounting hole 11 of the negative electrode square end plate 10. At the same time, the negative electrode square platform 13 is stuck at the lower end of the cover plate 2 and connected to the negative electrode connecting piece.

[0026] Limiting holes 12 are provided diagonally at both ends of the negative electrode square end plate 10, and a limiting groove 16 is provided on one side of the lower end of the cover plate 2. A negative electrode upper insulating injection molded part 17 is injection molded between the negative electrode square end plate 10 and the cover plate 2 through an injection molding machine. The negative electrode upper insulating injection molded part 17 covers the lower end and the surrounding area of ​​the negative electrode square end plate 10. An upper positioning cylinder 18 is formed on the negative electrode upper insulating injection molded part 17 and cooperates with the limiting holes 12 to play a role in fixing and preventing loosening. The upper insulating injection molded part 17 serves to separate the negative electrode square end plate 10 and the cover plate 2 and provide insulation.

[0027] A negative electrode lower insulating injection molded part 19 is injection molded between the negative electrode square platform 13 and the cover plate 2 via an injection molding machine. The negative electrode lower insulating injection molded part 19 covers the upper end and the surrounding area of ​​the negative electrode square platform 13. A lower positioning cylinder 20 is formed on the negative electrode cylinder 14 and cooperates with the limiting groove 16 to play a role in fixing and preventing loosening. The lower insulating injection molded part 19 plays a role in insulating the cover plate 2 and the negative electrode column riveting structure.

[0028] This utility model provides an eccentric riveted electrode post negative electrode cover structure for a lithium-ion square battery. Its eccentric riveting structure can better accommodate different types of electrode tabs, enhance the compatibility between structural components, reduce mold opening costs, and at the same time increase the welding area of ​​the connecting piece, enhance the battery output channel, and improve the battery output efficiency.

[0029] In actual use, the mold first forms the cover plate 2, the negative electrode square end plate 10, and the copper negative electrode post riveting structure. The negative electrode cylinder 14 is then passed through the sealing ring 15, the cover plate 2, and the negative electrode square end plate 10 in sequence. An injection molding machine molds the upper insulating part of the negative electrode between the negative electrode square end plate 10 and the cover plate 2, and the lower insulating part of the negative electrode between the cover plate 2 and the lower end of the negative electrode square platform 13 of the negative electrode post riveting structure. Then, a pneumatic riveting machine rivets the negative electrode cylinder 14 from the top. Finally, an explosion-proof patch 7 and an explosion-proof film 6 are installed to ensure battery safety. During operation, the tab connecting piece is welded to the lower surface of the negative electrode square platform 13 to form a current loop. The introduction of the eccentric structure better adapts to different tab widths, retains the cover plate 2 and the negative electrode square end plate 10, reduces the mold opening cost of the cover plate 2 and the negative electrode square end plate 10, and improves the compatibility of structural components.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A negative electrode cover structure for an eccentrically riveted terminal block lithium-ion square battery, comprising: The cover plate (2) is characterized in that: a protrusion (8) is provided on one side of the upper end of the cover plate (2), a round hole is provided at the upper end of the protrusion (8), and an injection hole (3) and an explosion-proof hole (5) are respectively provided at the upper end of the cover plate (2). The upper end of the cover plate (2) is provided with a negative electrode square end plate (10). The upper end of the negative electrode square end plate (10) is provided with an installation hole (11). The cross section of the installation hole (11) is convex. The lower end of the cover plate (2) is provided with a negative electrode post rivet structure. The negative electrode post rivet structure is a negative electrode square platform (13). The negative electrode cylinder (14) is fixedly installed on one side of the upper end of the negative electrode square platform (13). A sealing ring (15) is sleeved on the outer end of the negative electrode cylinder (14). The upper end of the negative electrode cylinder (14) passes through the cover plate (2) and the negative electrode square end plate (10) in sequence.

2. The eccentric rivet electrode post lithium-ion square battery negative electrode cover structure according to claim 1, characterized in that: The negative electrode square end plate (10) has diagonal limit holes (12) at its left and right ends, and a limit groove (16) is provided on one side of the lower end of the cover plate (2). The positive electrode post (1) is fixedly installed on the other side of the upper end of the cover plate (2).

3. The eccentric rivet electrode post lithium-ion square battery negative electrode cover structure according to claim 1, characterized in that: A sealing aluminum cap (4) is fixedly installed inside the injection hole (3).

4. The eccentric rivet electrode post lithium-ion square battery negative electrode cover structure according to claim 1, characterized in that: An explosion-proof film (6) is bonded to the upper end of the explosion-proof hole (5), and an explosion-proof patch (7) is fixedly installed at the lower end.

5. The eccentric rivet electrode post lithium-ion square battery negative electrode cover structure according to claim 1, characterized in that: The negative electrode platform (13) and the negative electrode cylinder (14) are integrally formed, and the negative electrode platform (13) and the negative electrode cylinder (14) have an eccentric structure.

6. The eccentric rivet electrode post lithium-ion square battery negative electrode cover structure according to claim 1, characterized in that: The negative electrode square end plate (10) and the cover plate (2) are connected by injection molding machine to form a negative electrode upper insulating injection molded part (17). The negative electrode upper insulating injection molded part (17) wraps the lower end and the surrounding area of ​​the negative electrode square end plate (10). An upper positioning cylinder (18) is formed on the negative electrode upper insulating injection molded part (17) and cooperates with the limiting hole (12).

7. The eccentric rivet electrode post lithium-ion square battery negative electrode cover structure according to claim 1, characterized in that: The negative electrode square platform (13) and the cover plate (2) are connected by injection molding machine to form a negative electrode lower insulating injection molding part (19). The negative electrode lower insulating injection molding part (19) wraps the upper end and the surrounding area of ​​the negative electrode square platform (13). A lower positioning cylinder (20) is formed on the negative electrode cylinder (14) and cooperates with the limiting groove (16).

8. The eccentric rivet electrode post lithium-ion square battery negative electrode cover structure according to claim 1, characterized in that: The negative electrode square platform (13) and the negative electrode cylinder (14) are made of copper.

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