Rechargeable Battery Safety Vent with Curved Grooves
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Solution Overview
Problem
Rechargeable batteries face safety risks due to overcharging, which can lead to gas generation and potential expansion or explosion, necessitating an effective gas discharge mechanism.
Innovation Solution
A rechargeable battery design featuring a safety vent with a main groove and sub grooves that provide increased stiffness, allowing for controlled gas discharge through a cap plate with a vent hole, ensuring reliable operation and preventing explosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple vent hole is provided in the cap plate, then gas discharge is enabled, but the safety vent lacks sufficient stiffness and may deform under pressure
Solution Approach 1:
The safety vent incorporates a convex curved surface facing the electrode assembly, which enhances structural stiffness and resistance to deformation under internal pressure while maintaining the gas discharge function through the vent hole
2Strength
If the safety vent is made thicker to increase stiffness, then deformation resistance improves, but the overall device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of increasing thickness, the invention uses a convex curved surface geometry that provides enhanced stiffness and deformation resistance while maintaining a thin profile, thus avoiding increased device complexity and manufacturing difficulty
Solution Approach 2:
The invention changes the geometric parameters of the safety vent by introducing a convex curved surface with specific radius of curvature, which optimizes the strength-to-thickness ratio without requiring additional structural complexity
Data Source
AI summary
A rechargeable battery including an electrode assembly; a case accommodating the electrode assembly; a cap plate sealing the case, the cap plate including a vent hole for discharge of gas; and a safety vent at the vent hole, wherein the safety vent includes main groove at a center thereof; and sub groove around the main groove.