Battery Cell Vent Notch Geometry for Internal Pressure Relief
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Solution Overview
Problem
Battery cells experience swelling due to increased internal pressure and heat generation during charging and discharging, leading to potential explosions or fires, necessitating a solution to control internal pressure.
Innovation Solution
A battery cell design incorporating a vent notch portion with a straight and curved pattern, etched using a laser, which allows for pressure adjustment and is integrated with the case body or cover, featuring distinct widths and depths for the straight and curved portions, and a rougher surface texture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent notch portion is formed separately from the case body, then the venting function can be provided, but the production efficiency decreases due to additional manufacturing steps
Solution Approach 1:
The vent notch portion is integrated into the case body as a single molded structure, combining the case and venting function into one component. This eliminates separate manufacturing steps for the vent notch, improving production efficiency while maintaining the pressure control function through the integrated design
2Device complexity
If the vent notch portion has uniform width throughout, then the structure is simpler, but the pressure control precision is insufficient
Solution Approach 1:
The vent notch portion features variable width with different sections: a first width in the radial direction and a second width in the axial direction. This local variation in dimensions allows precise control over pressure characteristics while maintaining an integrated structure, resolving the contradiction between structural simplicity and pressure control precision
3Reliability
If the vent notch portion is deeply recessed, then the pressure relief capability is improved, but the structural strength decreases
Solution Approach 1:
The vent notch portion includes a curved surface connecting the first and second surfaces, replacing sharp corners with smooth transitions. This curvature reduces stress concentration while maintaining adequate depth for pressure relief, thus preserving structural strength while improving pressure relief capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances stability by managing internal pressure and improves production efficiency through integrated manufacturing of the vent notch portion.
Implementation Method 1
etched using a laser
Data Source
AI summary
The present disclosure relates to a battery cell comprising a case body accommodating an electrode assembly, a case cover covering at least one face of the case body which is open, and a vent notch portion formed by being recessed at at least one of one surface of the case body or one surface of the case cover. The vent notch portion includes a straight portion having a straight pattern, and a curved portion connected to the straight portion and having a curved pattern. A width of the straight portion is different from a width of the curved portion.