Laminated-Film Sealed Battery Housing for Electrode Stability
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Solution Overview
Problem
In sealed batteries with a laminated film exterior body, the movement of the electrode body within the housing part can cause deformation and damage, leading to short circuits, which is undesirable.
Innovation Solution
The housing part of the exterior body is designed with curved side walls that closely approach the electrode body, preventing its movement and thus minimizing deformation and damage, while the current collector terminals are arranged on the short sides to maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the electrode body is arranged in a housing part formed on a laminated film, then the electrode body can be positioned at a suitable location inside the exterior body, but the electrode body may move inside the housing part causing deformation and damage
Solution Approach 1:
The housing part is designed with curved side walls that extend upward from the sealed part and curve toward the electrode body, creating a contoured structure that closely follows the shape of the electrode body. This curvature allows the housing part to conformally contact the electrode body surface, preventing movement while avoiding concentrated stress points that could cause deformation or damage.
Solution Approach 2:
The exterior body is constructed from a laminated film that forms a flexible yet protective housing part. This thin film structure can adapt to the electrode body's shape through the curved side walls while providing sufficient mechanical protection, balancing the need for close contact with the electrode body and the need to prevent damage.
2Reliability
If the side walls of the housing part curve toward the electrode body, then movement of the electrode body is suppressed, but the current collector terminals may be affected by the curved structure
Solution Approach 1:
The curved side walls are strategically positioned to contact only the body portion of the electrode, while the current collector terminals extend outward through openings in the exterior body without being constrained by the curved structure. This localized curvature application ensures stable electrode positioning while leaving the terminal region free from deformation risks.
Solution Approach 2:
The housing part is designed with distinct functional zones: curved side walls for electrode body stabilization and separate terminal openings for current collector terminal passage. This segmentation allows the curved structure to perform its electrode-holding function without interfering with the terminal structure, eliminating the trade-off between stability and terminal integrity.
Data Source
AI summary
Provided is a technique capable of suppressing movement of an electrode body inside an exterior body. According to the technique disclosed herein, a sealed battery is provided, which includes an electrode body having a wide face having a rectangular shape, an exterior body made of a laminated film, and positive electrode and negative electrode current collector terminals. The exterior body includes a housing part housing the electrode body, and a sealed part formed around the housing part to isolate the inside and the outside of the exterior body from each other. The housing part has a flat face facing the wide face of the electrode body and four side walls corresponding to four sides of the wide face respectively, the four side walls being formed so as to rise from the sealed part toward the flat face. A pair of the side walls corresponding to long sides of the wide face curves toward the electrode body and inward of the exterior body so as to closely approach the electrode body.