Battery Collector Structure for Electrode Tab Junction Protection
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Solution Overview
Problem
Secondary batteries with electrode tab groups are prone to damage at the junction between the electrode tab group and collector due to external vibrations or impacts, which can cause stress and lead to foil cutting or peeling, compromising the battery's integrity.
Innovation Solution
The secondary battery design incorporates a collector with a third region part closer to the electrode body than the first region part, which restricts the movement of the electrode body, reducing stress on the junction between the electrode tab group and collector, and may include an insulation layer to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electrode body is allowed to move freely in the battery case, then the battery can accommodate external forces, but the junction between the electrode tab group and collector sustains damage due to stress from movement
Solution Approach 1:
The collector is designed with differentiated regional structures: a first region part for joining with electrode tabs, a second region part for connecting to the terminal, and a third region part closer to the electrode body. This local differentiation allows the collector to provide restricted support where needed while maintaining electrical connectivity functions elsewhere, thus protecting the junction from stress without compromising overall battery adaptability to external forces
2Reliability
If the electrode tabs are made soft and flexible for electrical connection, then electrical conductivity is improved, but the junction becomes vulnerable to damage from repeated stress
Solution Approach 1:
The third region part of the collector acts as an intermediary element between the electrode body and the first region part (junction area). This intermediary structure restricts electrode body movement and reduces stress transmission to the vulnerable junction, thereby protecting the soft electrode tabs from damage while maintaining their electrical connectivity function
Data Source
AI summary
A technology is provided which suppresses the movement of an electrode body inside of a battery case, and prevents the damage at a junction between an electrode tab group and a collector. A secondary battery herein disclosed includes an exterior body, a sealing plate, an electrode body, an electrode tab group, a terminal, and a collector. The collector has a first region part to be joined with the electrode tab group, a second region part to be joined with the terminal, and a third region part closer to the electrode body than the first region part.