Secondary battery, and apparatus and method for manufacturing secondary battery

By introducing a reinforced sealing area into the sealed portion of the secondary battery, and utilizing the pressing surface and raised surface structure, the sealing force at the electrode leads is enhanced, solving the problem of insufficient sealing force of the secondary battery under high capacity and high output, and improving safety.

CN116075977BActive Publication Date: 2026-07-07LG ENERGY SOLUTION LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LG ENERGY SOLUTION LTD
Filing Date
2021-08-23
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Under high capacity and high output conditions, existing secondary batteries have insufficient sealing force in the battery casing, especially the sealing part at the electrode leads is prone to air leakage, which increases the risk of explosion or fire.

Method used

A reinforced sealing area is introduced into the sealed part of the battery casing, including a connection sealing area, a front sealing area and a reinforced sealing area. The sealing force is enhanced by the structure of the pressing surface and the raised surface. The resin layer of the raised surface is thicker than that of the pressing surface, forming a reinforced sealing area.

Benefits of technology

It significantly improves the sealing force of the battery casing seal, prevents air leakage, enhances the tensile strength of the seal, avoids delamination or peeling, and improves the safety of the secondary battery.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN116075977B_ABST
    Figure CN116075977B_ABST
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Abstract

A secondary battery includes an electrode assembly, an electrode lead, a battery case provided with an accommodation portion for accommodating the electrode assembly and a sealing portion for sealing the accommodation portion, and a lead film. The sealing portion through which the electrode lead is pulled out includes a connection sealing area connected to the accommodation portion, a front end sealing area located on the opposite side of the connection sealing area, and a reinforcement sealing area provided between the connection sealing area and the front end sealing area. The reinforcement sealing area includes a depressed surface located in the sealing portion between the connection sealing area and the front end sealing area and recessed into the sealing portion, and a raised surface located in the sealing portion between the connection sealing area and the depressed surface and between the front end sealing area and the depressed surface, each of the raised surfaces being formed thicker than the depressed surface. The battery case has a structure in which a resin layer, a metal layer, and an insulating layer are sequentially stacked in the direction from the inside to the outside. The resin layer of the raised surface is formed thicker than the resin layer of the depressed surface.
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