Battery Safety Vent Thickness Profile for Pressure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rechargeable batteries face challenges in controlling the operating pressure and breaking pressure of safety vents, which affects the reliability and safety due to operational dispersion in the cap assembly.
Innovation Solution
The rechargeable battery design includes a safety vent with varying thicknesses in its central, middle, fusion, and wing parts, allowing for precise control of the swelling curve, operating pressure, and breaking pressure by adjusting the shape and thickness differences, and is sealed with a cap assembly using an insulating gasket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the safety vent has uniform thickness, then the manufacturing process is simple, but the operating pressure and breaking pressure cannot be precisely controlled
Solution Approach 1:
The safety vent is designed with different thicknesses in different regions (central part, middle part, fusion part, wing part) to create localized structural properties. This allows precise control of operating pressure and breaking pressure by adjusting the thickness distribution, while maintaining a relatively simple overall structure that is easy to manufacture.
2Reliability
If the cap assembly has high precision manufacturing, then the operating pressure control is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The invention controls operational dispersion by adjusting the thickness parameters of different parts of the safety vent. By optimizing the thickness values of the central part, middle part, fusion part, and wing part, the operating pressure and breaking pressure can be precisely controlled, improving reliability without requiring complex additional structures in the cap assembly.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A rechargeable battery includes an electrode assembly, a can accommodating the electrode assembly in an internal region of the can, and a cap assembly coupled to the can to seal the can. The cap assembly includes a safety vent and a cap down stacked with a connecting member interposed between the safety vent and the cap down. The safety vent comprises a central part joined to the cap down, a middle part comprising a step portion and a notch groove, a fusion part in contact with the connecting member, and a wing part surrounding the fusion part. At least three of the central part, middle part, the fusion part, or the wing part have different thicknesses.