Battery Case Recess Structure for Easier Electrode Assembly Insertion
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Solution Overview
Problem
Existing electricity storage devices face challenges in enhancing productivity, particularly in the assembly process of electrode assemblies within rectangular cylindrical cases, leading to inefficiencies in manufacturing.
Innovation Solution
The design incorporates a rectangular cylindrical case main body with recessed parts on the narrow width surfaces, allowing for easier insertion and alignment of the electrode assembly, reducing contact area and insertion resistance, and facilitating stable insertion postures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the case main body has a rectangular cylindrical shape with both ends opened for electrode assembly insertion, then the assembly process should be simplified, but the insertion resistance and alignment difficulty increase
Solution Approach 1:
The patent applies local quality by creating recessed parts at specific locations (inner sides of narrow width surfaces) of the case main body. These recessed parts locally modify the insertion surface to reduce contact area and insertion resistance, while maintaining the overall rectangular cylindrical structure. This localized modification solves the insertion difficulty without changing the entire case design.
Solution Approach 2:
The recessed parts are pre-formed on the case main body before electrode assembly insertion. This preliminary action creates ready-made alignment features and reduces insertion resistance in advance, making the subsequent electrode assembly insertion process smoother and more efficient.
2Productivity
If recessed parts are added to the case main body to reduce insertion resistance, then productivity is enhanced, but device complexity increases
Solution Approach 1:
The recessed parts are localized modifications on specific surfaces (narrow width surfaces) of the case main body rather than complex overall restructuring. This localized approach enhances productivity by facilitating electrode assembly insertion while adding minimal structural complexity compared to a complete redesign.
Solution Approach 2:
The case main body surface is segmented into different regions: flat wide width surfaces and recessed narrow width surfaces. This segmentation allows the electrode assembly to be guided and inserted more easily through the recessed portions, improving productivity without requiring complex additional components.
Data Source
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AI summary
A battery (100) being as one aspect of a herein disclosed electricity storage device includes a case main body (12) which is formed in a rectangular cylindrical shape and whose both sides in a length direction are opened, an electrode assembly (20) that is accommodated by the case main body (12), a first lid body (14a) that is installed on an opening at one end side in the length direction of the case main body (12), and a second lid body (14b) that is installed on an opening at the other end side in the length direction of the case main body (12). The case main body (12) includes a pair of wide width surfaces (12b) being opposed to each other, and a pair of narrow width surfaces (12a) that are opposed to each other and that are configured to continue to the pair of wide width surfaces (12b). A recessed part (12a1) configured to elongate along the length direction of the case main body (12) is present at an inner side of at least one narrow width surface (12a) of the pair of narrow width surfaces (12a).