Convex Battery Case Structure for Higher Volume Energy Density
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Solution Overview
Problem
Existing battery designs with pressing members degrade the volume energy density of batteries.
Innovation Solution
A battery case with a hollow structure featuring a convex third surface and specific positional relationships between its surfaces, allowing for efficient storage and fixation of the electrode body without additional pressing members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressing member is arranged on the peripheral surfaces of the laminated electrode body, then the electrode body is securely pressed and positioned, but the volume energy density of the battery degrades due to the additional component occupying space
Solution Approach 1:
The pressing function is merged into the battery case structure itself. The third surface of the battery case includes a convex structure that directly contacts and presses the electrode body, eliminating the need for separate pressing members. This integration maintains electrode body positioning stability while removing the space-consuming external pressing components.
Solution Approach 2:
The pressing member is extracted from the system and its function is transferred to the battery case structure. By removing the separate pressing member and incorporating the pressing capability into the case's third surface convex structure, the design reduces component count and increases volume energy density while maintaining the necessary pressing function.
2Reliability
If a laminate-type outer package is used to store the electrode body, then the battery structure is formed, but the seal parts and packaging structure reduce the volume energy density
Solution Approach 1:
The outer package structure is merged with the battery case. The battery case itself serves as the containing structure with integrated sealing capabilities through its hollow structure and surface configurations, eliminating the need for separate laminate-type outer packaging and reducing the volume occupied by seal parts.
Solution Approach 2:
The battery case employs a streamlined hollow structure with optimized surface geometry that provides both containment and sealing functions with minimal material thickness, reducing the volume consumed by packaging structures while maintaining structural integrity.
3Ease of manufacture
If additional pressing members and laminate packaging are used, then the battery is fully assembled with all necessary components, but the overall volume increases and volume energy density decreases
Solution Approach 1:
Multiple functions (containment, sealing, and pressing) are merged into the battery case structure. The hollow structure provides containment, the surface configurations provide sealing, and the convex structure on the third surface provides pressing, all in a single integrated component that reduces overall battery volume.
Solution Approach 2:
The battery case is designed as a multi-functional component that simultaneously serves as the outer package, seal, and pressing mechanism. This universal design eliminates the need for separate components, reducing battery volume while maintaining assembly completeness and manufacturing ease.
Data Source
AI summary
A main object of the present disclosure is to provide a battery case with which excellent volume density is obtained. The present disclosure achieves the object by providing a battery case for storing an electrode body, the battery case including: a hollow structure; the hollow structure includes a first surface, a second surface facing the first surface, a third surface connecting the first surface and the second surface, and a fourth surface facing the third surface; and in a side view of an axis direction of the hollow structure, when B1 designates a boarder part between the third surface and the first surface, B2 designates a boarder part between the third surface and the second surface, and L12 designates a line segment connecting the B1 and the B2, the third surface includes a convex structure of which top is positioned closer to the fourth surface side compared to the L12.