Battery Cell Notch-and-Protrusion Exterior for Pressure Relief
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Solution Overview
Problem
Existing battery cells face challenges in controlling internal pressure, which can lead to swelling, heat generation, and potential explosions or fires, necessitating a method to manage internal pressure for improved stability.
Innovation Solution
A battery cell design featuring a groove-shaped notch portion and a protrusion portion formed integrally with the exterior material, allowing for controlled venting of internal pressure and improved production efficiency through a manufacturing method that includes notching, inserting, and covering steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the interior material is made thick and strong to contain high internal pressure, then the strength and pressure resistance are improved, but the manufacturing complexity and production time increase due to the need for separate notch portion attachment
Solution Approach 1:
The notch portion is integrated into the interior material as a single piece structure, merging the container function and the pressure relief function into one component. This eliminates the need for separate attachment steps and reduces manufacturing complexity while maintaining the required strength and pressure resistance through optimized integral design
2Reliability
If a separate notch portion is attached to the interior material, then the pressure relief function is improved, but the production efficiency decreases due to additional attachment steps
Solution Approach 1:
The interior material is designed as an integral structure where the notch portion is formed as one piece with the main body. This single-piece design maintains the reliable pressure relief function while eliminating multiple attachment steps, thereby significantly improving production efficiency and reducing manufacturing time
3Reliability
If the notch portion is made large to ensure adequate venting, then the pressure control is improved, but the structural integrity and strength of the exterior material are reduced
Solution Approach 1:
The interior material employs local quality enhancement by concentrating material density and structural reinforcement specifically at the notch portion and surrounding areas. This localized strengthening ensures adequate venting capability while maintaining overall structural integrity, allowing the rest of the exterior material to remain optimized for other functions
Data Source
AI summary
A battery cell of the present disclosure includes an electrode assembly including a cathode, an anode, and a separator; an exterior material accommodating the electrode assembly therein; a notch portion recessed from an inner surface of the exterior material toward an outside and defined in the form of a groove; and a protrusion portion corresponding to the notch portion on an outer surface of the exterior material disposed in an opposite direction of the inner surface and protruding toward the outside.