Secondary battery cover plate

Abstract

The utility model provides a secondary battery cover plate and belongs to the technical field of secondary batteries. Comprising a cover plate body, penetrating grooves are formed in the two ends of the cover plate body, pole columns are arranged in the grooves, sealing rings are arranged at the contact positions of the lower portions of the pole columns and the grooves, the upper portions of the pole columns are sleeved with fixing rings, the fixing rings and the cover plate body are welded and combined in a flush mode, through holes are formed in the fixing rings, and pole column injection molding plates are arranged on the fixing rings. And the diameter of the pole injection molding plate is greater than that of the groove. According to the utility model, the sealing stability of the sealing ring and the safety stability of the secondary battery are improved.

Description

Technical Field

[0001] This utility model belongs to the field of secondary battery assembly technology, and specifically relates to a secondary battery cover plate. Background Technology

[0002] To protect lithium-ion cells from environmental impacts, secondary batteries are typically encapsulated in casings, and a crucial component of these casings is the cover. Currently, most secondary battery covers on the market are injection molded using polyphenylene sulfide (PPS). Over time, this plastic ages and becomes brittle, leading to a reduction in the compression of the sealing rings in the existing structure. This reduces sealing performance, causing internal electrolyte leakage after the secondary battery is used, thus increasing the risk of fire.

[0003] Therefore, it is necessary to develop a structurally optimized cover plate structure to improve the sealing stability of the sealing ring. Utility Model Content

[0004] This utility model provides a secondary battery cover plate, which solves the shortcomings of the prior art and effectively prevents leakage caused by insufficient compression of the sealing ring due to the separation of the aluminum plate caused by the aging, expansion and embrittlement of the injection molded cover plate.

[0005] To achieve the above objectives, the technical solution of this utility model is:

[0006] A secondary battery cover includes a cover body with through grooves at both ends. A terminal post is disposed in the groove. A sealing ring is disposed at the lower part of the terminal post where it contacts the groove. A fixing ring is fitted onto the upper part of the terminal post. The fixing ring is flush with the cover body and has a through hole. A terminal post injection molded plate is disposed on the fixing ring. The diameter of the terminal post injection molded plate is greater than or equal to the diameter of the fixing ring, thus covering the fixing ring.

[0007] Furthermore, the cover plate body is made of an aluminum plate and a lower injection-molded plate that are fixedly connected by ultrasonic welding.

[0008] Furthermore, the pole post is a stepped column shape, smaller at the top and larger at the bottom, with a protrusion in the middle, and a groove is provided on the surface of the protrusion.

[0009] Furthermore, the groove is a V-shaped groove, formed by cold stamping.

[0010] Furthermore, the electrode includes a positive electrode and a negative electrode, wherein the negative electrode is made of copper and aluminum through high-speed friction welding.

[0011] Furthermore, an explosion-proof valve is installed in the middle of the aluminum plate, and is welded to the aluminum plate by laser. A protective film is installed on the explosion-proof valve.

[0012] Furthermore, the grooves in the aluminum plate are formed by stamping.

[0013] Furthermore, the electrode injection plate is injection molded, and the injection material fills the through holes and V-grooves.

[0014] The beneficial effects of this utility model are:

[0015] This invention employs a structure where the diameter of the injection-molded electrode plate is larger than the diameter of the retaining ring, thus covering the retaining ring. The retaining ring is embedded in the plastic to increase its rigidity, thereby enhancing the sealing performance of the sealing ring. This structure optimizes the sealing stability of the sealing ring and the safety stability of the secondary battery. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the cover plate of this utility model;

[0017] Figure 2 This is a cross-sectional view of the cover plate of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the pole post of this utility model;

[0019] Figure 4 This is a schematic diagram of the negative electrode post of this utility model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] See Figure 1 , Figure 2 , Figure 3 , Figure 4 A secondary battery cover plate includes an aluminum plate 6, a positive electrode injection molding 1, a fixing ring 2, a positive electrode post 3, a negative electrode injection molding 4, a negative electrode post 5, a lower injection molding plate 7, an explosion-proof valve 8, a protective film 9, and a sealing ring 10.

[0023] In this embodiment, the aluminum plate 6 is formed by stamping, and a recessed platform is stamped on it. A sealing ring 10 is placed on the recessed platform. The sealing ring 10 fits tightly with the positive electrode post 3 and the negative electrode post 5. The aluminum plate 6 and the fixing ring 2 are connected by welding. The positive electrode injection molding 1 connects the positive electrode post 3 and the fixing ring 2, and the negative electrode injection molding 4 connects the negative electrode post 5 and the fixing ring 2. The explosion-proof valve 8 is welded to the aluminum plate 6 by laser welding. The lower injection molding plate 7 is welded to the aluminum plate 6 by ultrasonic welding. The protective film 9 is pasted to the aluminum plate 6 by a ring-shaped double-sided adhesive.

[0024] In this embodiment, the positive electrode post 3 is formed by cold stamping, and an annular keyway is provided on the upper surface of the boss to prevent slippage.

[0025] The negative electrode post 5 in this embodiment is characterized by being made of copper 5.2 and aluminum 5.1 through high-speed friction welding, and an annular keyway is provided on the upper surface of the boss for anti-slip.

[0026] In this embodiment, the lower injection molded plate is a cover plate composed of a light aluminum plate, with through grooves at both ends. An electrode post is placed in the groove, and a sealing ring is placed at the contact point between the lower part of the electrode post and the groove. A fixing ring is fitted on the upper part of the electrode post, and the fixing ring is flush with the cover plate body. A through hole is provided on the fixing ring, and an electrode post injection molded plate is placed on the fixing ring. The diameter of the electrode post injection molded plate is larger than the diameter of the fixing ring, covering the fixing ring. That is, both the positive electrode injection molded plate and the negative electrode injection molded plate are larger than the groove, covering the fixing ring. The electrode post injection molded plate is injection molded, and the injection molding material fills the through hole and the V-shaped groove.

[0027] This invention relates to a simple and optimized secondary battery cover. By using a retaining ring to fix the injection molding, it prevents leakage caused by insufficient compression of the sealing ring due to separation of the aluminum plate caused by aging, expansion, and embrittlement of the injection molded plastic. Even if the plastic ages, shrinks, or expands, the retaining ring embedded in the plastic increases its rigidity, thereby enhancing the sealing performance of the sealing ring. This invention optimizes the sealing stability of the sealing ring and the safety stability of the secondary battery.

[0028] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A secondary battery cover, characterized in that, The device includes a cover plate body, with through grooves at both ends. An electrode post is disposed within the groove. A sealing ring is disposed at the lower part of the electrode post where it contacts the groove. A fixing ring is fitted onto the upper part of the electrode post. The fixing ring is flush with the cover plate body and has a through hole. An electrode post injection molded plate is disposed on the fixing ring. The diameter of the electrode post injection molded plate is greater than or equal to the diameter of the fixing ring.

2. The secondary battery cover plate according to claim 1, characterized in that, The cover plate body is fixedly connected to the light aluminum plate and the lower injection-molded plate by ultrasonic welding.

3. The secondary battery cover plate according to claim 2, characterized in that, The pole post is a stepped column with a smaller top and a larger bottom and a protrusion in the middle. The surface of the protrusion is provided with a groove.

4. The secondary battery cover plate according to claim 2, characterized in that, The groove is a V-shaped groove, formed by cold stamping.

5. The secondary battery cover plate according to claim 4, characterized in that, The electrode includes a negative electrode, which is made of copper and aluminum by high-speed friction welding.

6. The secondary battery cover plate according to claim 5, characterized in that, An explosion-proof valve is installed in the middle of the aluminum plate and is welded to the aluminum plate by laser. A protective film is installed on the explosion-proof valve.

7. The secondary battery cover plate according to claim 6, characterized in that, The grooves in the aluminum plate are formed by stamping.

8. The secondary battery cover plate according to claim 1, characterized in that, The pole injection plate is injection molded, and the injection material fills the through holes and V-grooves.

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