Battery Cell Tab Protection Structure for Metal Particle Blocking
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Solution Overview
Problem
Existing battery cell technologies face safety challenges due to metal particles generated during the flattening process of electrode tabs, which can lead to short circuits and decreased yield.
Innovation Solution
A battery cell design that incorporates a protection member with a base plate and an electrode tab limit portion, featuring a through hole to accommodate the electrode tab and a recess to reduce pressure requirements, thereby blocking metal particles and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection member is added to block metal particles, then safety is improved, but device complexity increases
Solution Approach 1:
The protection member is installed on the end surface before the flattening process occurs, preventing metal particles from falling onto the electrode assembly in advance. This preliminary protective measure eliminates the need for complex post-processing safety systems while maintaining high safety standards throughout the battery's operational life.
2Manufacturing precision
If the electrode tab limit portion is designed to limit thickness, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The electrode tab limit portion is designed with differentiated local structures: a first limit portion for the first electrode tab and a second limit portion for the second electrode tab. Each limit portion is positioned and dimensioned specifically for its corresponding tab, enabling precise thickness control at critical locations without requiring complex overall structural modifications to the protection member.
3Ease of manufacture
If the base plate contacts the end surface to reduce pressure, then ease of manufacture is improved, but reliability may worsen due to potential misalignment
Solution Approach 1:
The base plate is designed as a thin, flexible component that can conform to the end surface geometry. This flexibility allows the base plate to maintain reliable contact across the entire end surface area, distributing pressure uniformly while accommodating minor variations in positioning or surface flatness, thus ensuring both ease of manufacture and coordination reliability.
Data Source
AI summary
A battery cell includes a housing, an electrode assembly and a protection member. The electrode assembly is accommodated in the housing. The electrode assembly includes a body portion and a first electrode tab protruding from an end surface of the body portion. The protection member is disposed in the housing and covers at least a part of the end surface. The protection member is provided with a first through hole, and at least a part of the first electrode tab is accommodated in the first through hole.