Rechargeable Battery Fixing Member for Impact Absorption
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Solution Overview
Problem
Rechargeable batteries face challenges in maintaining the structural integrity and preventing short circuits due to external impacts, which can lead to deformation and abnormal reactions.
Innovation Solution
A rechargeable battery design incorporating a fixing member with a central portion and a wing that overlaps the electrode assembly, where the wing is spiral-wound and bent towards the case's inner surface, providing adhesion to secure the electrode assembly within the case and absorb external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode assembly is loosely placed in the case, then the battery structure is simple and easy to manufacture, but the electrode assembly moves during external impacts causing short circuits and structural integrity issues
Solution Approach 1:
A fixing member is introduced as an intermediary component between the electrode assembly and the case. This fixing member includes a body portion that contacts the electrode assembly and a wing portion that contacts the case, serving as a mediator to prevent direct movement while maintaining structural integrity and preventing short circuits.
Solution Approach 2:
The fixing member is segmented into distinct functional portions: a body portion that interfaces with the electrode assembly and a wing portion that interfaces with the case. This segmentation allows each portion to be optimized for its specific function while working together to solve the contradiction between reliability and complexity.
2Strength
If the fixing member has a large wing extending outside the electrode assembly, then the adhesion to the case is stronger, but the device occupies more space inside the case
Solution Approach 1:
The wing portion of the fixing member is designed with specific local characteristics: it extends only to the necessary distance to contact the case inner surface, has a height of about 3.5 mm to about 5 mm for optimal adhesion, and is positioned specifically at locations where structural support is needed. This local optimization provides strong adhesion while minimizing space occupation.
Data Source
AI summary
A rechargeable battery includes an electrode assembly including a first electrode and a second electrode, a case accommodating the electrode assembly, a cap assembly sealing the case, and a fixing member in the case, the fixing member having a central portion overlapping the electrode assembly, and a wing extending outside of the electrode assembly based on the central portion, one surface of the wing being attached to an inner surface of the case.