Sealed Battery Crimp Structure With Metal Height Adjustment
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Solution Overview
Problem
Existing sealed batteries, particularly non-aqueous electrolyte secondary batteries, face challenges in adjusting the height of the crimped portion of the exterior can without compromising the battery's exhaust performance, which is essential for maintaining the desired height relationship between the positive electrode cap and the crimped portion for improved welding quality and productivity.
Innovation Solution
A sealed battery design that incorporates a metal-made height adjusting portion within the sealing assembly, allowing for precise adjustment of the crimped portion's height through the use of a metal-made spacer, ensuring the crimped portion's height aligns with the positive electrode cap, thereby maintaining optimal battery performance and welding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the height of the positive electrode cap is reduced to match the crimped portion height, then the height relationship for welding is improved, but the exhaust performance deteriorates due to insufficient openings on the positive electrode cap
Solution Approach 1:
The sealing assembly is segmented into multiple functional components: the positive electrode cap, the gasket, and a dedicated height adjusting portion. This segmentation allows the height adjustment function to be isolated in a specific component without affecting the cap's opening structure, thus resolving the contradiction between height precision and exhaust performance.
Solution Approach 2:
A height adjusting portion is introduced as an intermediary element between the positive electrode cap and the crimped portion. This intermediary component absorbs the height difference through its adjustable thickness, enabling the cap to maintain its original height with sufficient openings while achieving the desired height relationship for welding.
2Reliability
If a resin insulating plate is used to prevent short circuit, then electrical insulation is improved, but the mechanical strength decreases making the plate easily deformed during crimping
Solution Approach 1:
The height adjusting portion is made of metal material that combines both electrical insulation properties (when appropriately coated or designed) and high mechanical strength. This composite material approach resolves the contradiction by providing both the insulation function and the structural strength needed to withstand crimping forces without deformation.
Data Source
AI summary
A nonaqueous electrolyte secondary battery is provided with a bottomed tubular outer can accommodating an electrode body, and a sealing body for sealing an opening portion of the outer can. A crimped portion for crimping and securing the sealing body is formed in the outer can by bending the edge portion of the opening portion inward in the radial direction, and the sealing body includes a rupture disk, a cathode cap including a flange, and a metal height adjusting portion for adjusting the height of the crimped portion.