Laminate Battery Side Member Geometry for Uniform Film Welding
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Solution Overview
Problem
In laminate-type batteries, differences in thickness occur in the laminate film after welding, particularly in regions contacting the side member, due to variations in heat absorption and melting during the welding process.
Innovation Solution
The side member is shaped such that its thickness continuously increases towards the offset side, ensuring a larger contact area and volume on the narrow region side, which helps in uniform heat absorption and melting of the laminate film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the side member is arranged at a position offset towards one side with respect to the center of the side surface, then the battery structure can be optimized for specific applications, but differences in thickness occur in the laminate film in the region contacting the side member
Solution Approach 1:
The side member is designed with non-uniform thickness distribution, where the thickness varies locally to match the offset arrangement. Specifically, the thickness of the side member increases towards the offset side, creating a compensatory effect that maintains uniform laminate film thickness across the entire contact region
Solution Approach 2:
The thickness parameter of the side member is changed continuously across its structure. By adjusting the thickness parameter of the side member from uniform to gradient distribution, the heat absorption characteristics are modified to compensate for the offset position, thereby maintaining consistent laminate film thickness
2Productivity
If the laminate film is welded to the electrode body with offset side member, then the battery can be manufactured, but the laminate film thickness varies depending on location due to uneven heat absorption and melting
Solution Approach 1:
The side member incorporates local quality variations in its thickness to compensate for the offset arrangement. The thickness is specifically increased towards the offset side to balance the heat distribution during welding, ensuring consistent laminate film thickness across different locations
Solution Approach 2:
The side member adopts an asymmetric thickness distribution that corresponds to its offset position. This asymmetric design creates a compensatory effect where the varying thickness of the side member balances the uneven heat absorption, resulting in uniform laminate film thickness despite the asymmetric offset arrangement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration suppresses differences in thickness within the laminate film after welding, ensuring a more uniform and reliable laminate structure.
Implementation Method 1
ensuring a larger contact area and volume on the narrow region side, which helps in uniform heat absorption and melting of the laminate film
Data Source
AI summary
A method of manufacturing a laminate-type battery is disclosed. The battery includes an electrode body, a side member disposed at a side face of the electrode body, and a laminate film covering the electrode body and a part of the side member, the side member being disposed at a position that is offset to a first side in a longitudinal direction of the side face relative to a center of the side face in the longitudinal direction. The method includes welding the laminate film so as to cover the electrode body and a part of the side member. The side member is shaped such that a thickness of the side member in a transverse direction of the side face increases continuously towards the first side.