Wound Battery Unit Support Structure for Stress Relief
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Solution Overview
Problem
The service life and safety of batteries are compromised due to stress concentration caused by compression of the support component against the electrode assembly during expansion, leading to active material loss and potential short circuits.
Innovation Solution
A battery unit design featuring a support component with a step region on its outer peripheral wall surface to accommodate the electrode assembly, reducing compression and stress concentration, thereby prolonging service life and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the support component compresses the electrode assembly to maintain structural stability, then the structural strength is improved, but stress concentration occurs leading to active material loss and reduced service life
Solution Approach 1:
The support component features a step region with different compression characteristics at different locations. The first compression region applies uniform compression to maintain structural stability, while the second compression region reduces compression to prevent stress concentration and active material loss, thereby extending service life
2Stability of the object's composition
If the support component uniformly compresses the electrode assembly, then structural stability is maintained, but stress concentration occurs at specific points leading to safety issues
Solution Approach 1:
The support component is designed with differentiated compression regions: a first compression region for uniform compression to maintain structural stability, and a second compression region with reduced compression to eliminate stress concentration points, thereby preventing safety issues while maintaining overall stability
3Power
If the battery unit expands during use, then electrochemical performance is maintained, but compression causes active material to fall off electrode plates leading to performance deterioration
Solution Approach 1:
The step region creates localized compression zones where the second compression region specifically protects the electrode assembly during expansion, preventing active material from falling off while allowing the battery unit to maintain its electrochemical performance through controlled expansion
Data Source
AI summary
A battery unit includes an electrode assembly and a support component. The electrode assembly includes a positive electrode plate and a negative electrode plate that have opposite polarities, and a separator separating the positive electrode plate and the negative electrode plate. The electrode assembly is wound around an outer periphery of the support component. An outer peripheral wall surface of the support component includes a first arc surface and a second arc surface. A first end of the first arc surface is connected to a first end of the second arc surface, and a second end of the first arc surface is spaced apart from a second end of the second arc surface so as to form a step region on the outer peripheral wall surface. The step region is configured to accommodate at least part of the electrode assembly.