Square lithium ion battery top cover structure

Abstract

The utility model discloses a square lithium ion battery top cover structure which comprises a cover plate, two sides of the cover plate are respectively and uniformly provided with glue pulling holes, the cover plate forms lower plastic integrally formed with the cover plate through injection molding of the glue pulling holes by a mold, and the lower plastic is provided with circulation holes on two sides of an anti-explosion valve. And the lower plastic is provided with a glue pulling structure which can be plugged into the glue pulling hole. The utility model aims to provide the battery cover plate structure which is large in overflowing, the plastic and the cover plate are integrally formed, and the plastic part structure cannot block the flowing of electrolyte.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a top cover structure of a square lithium-ion battery. Background Art

[0002] Lithium-ion aluminum shell batteries are widely used in electronic products, power, energy storage, aerospace and other fields due to their high energy density, long service life, flame retardancy, smokeless, non-toxic, excellent anti-aging performance and strong explosion-proof performance. The battery top cover is an important structural component of the lithium-ion aluminum shell battery, with a precise and complex structure that undertakes the functions of energy transmission and explosion-proof pressure relief. The existing large-capacity energy storage lithium-ion battery covers are wide in size and mostly of the multi-pole ear butterfly welding type structure, with low current-carrying capacity. The thickness of the plastic under the ordinary cover is relatively thick, about 5 mm. After assembly, the space utilization rate of the battery is low, and the plastic under the cover is assembled secondarily after molding, with complex assembly, easy deformation, affecting the assembly. Some structures of the plastic under the cover will also block the flow of the electrolyte during liquid injection. Therefore, a battery cover structure with large current-carrying capacity, integrally formed plastic and cover, and the plastic part structure that does not block the flow of the electrolyte is needed. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies in the above-mentioned prior art, and aims to provide a battery cover structure with large current-carrying capacity, integrally formed plastic and cover, and the plastic part structure that does not block the flow of the electrolyte.

[0004] To achieve the above purpose, the technical solution of the utility model is realized as follows:

[0005] A top cover structure of a square lithium-ion battery, including a cover plate. Glue pulling holes are evenly arranged on both sides of the cover plate respectively. After injection molding through the glue pulling holes by a mold, a plastic underlayer integrally formed with the cover plate is formed. Flow holes are arranged on both sides of the explosion-proof valve of the plastic underlayer, and a glue pulling structure that can be inserted into the glue pulling holes is arranged on the plastic underlayer.

[0006] Further, five glue pulling holes and five glue pulling structures are respectively arranged on the left and right sides.

[0007] Further, the glue pulling structure is frustum-shaped.

[0008] Further, the flow holes are square, and four flow holes are respectively arranged on both sides of the explosion-proof valve.

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

[0010] In the present utility model, the cover plate light aluminum sheet and the lower plastic are integrally injection molded through the glue pulling holes and the glue pulling structure. Since the frustum-shaped glue pulling structure can be inserted into the glue pulling holes to fix the cover plate and the lower plastic, the lower plastic is not easily deformed. Therefore, the thickness of the lower plastic can be reduced, improving the utilization rate. The flow holes provided on the lower plastic can assist the flow of the electrolyte and also reduce the weight of the lower plastic. Description of the Drawings

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

[0012] Figure 2 is a schematic structural diagram of the cover plate in the present utility model;

[0013] Figure 3 is a schematic structural diagram of the lower plastic in the present utility model;

[0014] Figure 4 is a distribution structure diagram of the glue pulling structure on the lower plastic in the present utility model.

[0015] Description of the Reference Numerals:

[0016] 1 - Cover plate, 2 - Lower plastic, 3 - Glue pulling structure, 4 - Flow hole, 5 - Glue pulling hole. Detailed Embodiment

[0017] The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0018] As Figures 1 to 4 shown, a square lithium-ion battery top cover structure includes a cover plate 1. The glue pulling holes 5 are evenly distributed on both sides of the cover plate 1. After injection molding through the glue pulling holes 5 by a mold, a lower plastic 2 integrally formed with the cover plate 1 is formed. Flow holes 4 are provided on both sides of the explosion-proof valve of the lower plastic 2, and a glue pulling structure 3 that can be inserted into the glue pulling holes 5 is provided on the lower plastic 2.

[0019] Among them, five glue pulling holes 5 and five glue pulling structures 3 are respectively provided on the left and right. The glue pulling structure 3 is frustum-shaped. The frustum-shaped glue pulling structure 3 can be inserted into the corresponding glue pulling holes 5 to fix the cover plate 1 and the lower plastic 2.

[0020] Among them, the flow holes 4 are square, and four flow holes 4 are respectively provided on both sides of the explosion-proof valve to assist the electrolyte to flow through the flow holes 4 of the lower plastic 2 after liquid injection, and can also reduce the weight of the lower plastic 2.

[0021] In the present utility model, the cover plate 1 light aluminum sheet and the lower plastic 2 are integrally injection molded through the glue pulling holes 5 and the glue pulling structure 3. Since the frustum-shaped glue pulling structure 3 can be inserted into the glue pulling holes 5 to fix the cover plate 1 and the lower plastic 2, the lower plastic 2 is not easily deformed. Therefore, the thickness of the lower plastic 2 can be reduced to 2 mm, improving the utilization rate.

[0022] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A top cover structure of a square lithium-ion battery, comprising a cover plate (1), characterized in that: On both sides of the cover plate (1), glue pulling holes (5) are evenly distributed. After injection molding through the mold via the glue pulling holes (5), a lower plastic (2) integrally formed with the cover plate (1) is formed. On both sides of the explosion-proof valve, the lower plastic (2) is provided with flow holes (4), and the lower plastic (2) is provided with a glue pulling structure (3) that can be inserted into the glue pulling holes (5).

2. The top cover structure of a square lithium-ion battery according to claim 1, characterized in that: Both the glue pulling holes (5) and the glue pulling structure (3) are respectively provided with five on the left and right sides.

3. The top cover structure of a square lithium-ion battery according to claim 2, characterized in that: The glue pulling structure (3) is frustum-shaped.

4. A square lithium-ion battery top cover structure according to claim 1, characterized in that: The flow holes (4) are square, and four flow holes (4) are respectively provided on both sides of the explosion-proof valve.

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