Cylindrical Battery Crimping Region Impact Absorption
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Solution Overview
Problem
Cylindrical secondary batteries face issues with sealability and safety due to deformation of the crimping region under external impacts and increased internal pressure, leading to electrolyte leakage and potential fires or explosions.
Innovation Solution
The crimping region is designed with a sidewall inclination of 1 to 8 degrees inward and a bent front end at 60 to 85 degrees, allowing for effective absorption of external impacts and maintaining sealability, preventing deformation and electrolyte leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the crimping region is formed with a conventional structure, then the cap assembly can be mounted to the container, but the crimping region deforms under external impacts and internal pressure, leading to electrolyte leakage
Solution Approach 1:
The patent changes the geometric parameters of the crimping region by introducing a sidewall inclination angle (α) of 1 to 8 degrees and a bent front end angle (β) of 60 to 85 degrees. These parameter modifications optimize the structural strength distribution, allowing the crimping region to resist deformation under external impacts and internal pressure while maintaining proper sealing function.
Solution Approach 2:
The patent introduces asymmetry to the conventional vertical crimping structure by inclining the sidewall at angle α and bending the front end at angle β. This asymmetric design creates a more robust structure that better withstands external impacts and internal pressure, preventing the deformation that occurs in symmetric conventional designs.
2Reliability
If the crimping region is strengthened to prevent deformation, then safety improves, but the complexity of the structure increases
Solution Approach 1:
Rather than adding complex components or structures, the patent achieves enhanced safety by modifying the geometric parameters of the existing crimping region structure. The sidewall inclination angle (α = 1 to 8 degrees) and bent front end angle (β = 60 to 85 degrees) provide the necessary strength while maintaining structural simplicity and ease of manufacturing.
Data Source
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AI summary
Disclosed herein is a cylindrical secondary battery constructed in a structure in which a crimping region, at which a cap assembly is mounted to the open upper end of a cylindrical container having an electrode assembly mounted therein, is formed at the upper end of the container, wherein the crimping region is constructed in a structure in which the upper end of the crimping region is gently bent at a predetermined radius of curvature (R), such that the crimping region surrounds a gasket located at the inside of the crimping region, the bent front end extends inward, such that the bent end presses the gasket, and an inclination of a predetermined angle is formed at the sidewall of the crimping region, such that the upper part of the crimping region is directed inward. According to the secondary battery of the present invention, the sealability of the gasket is improved, and external impacts are partially absorbed by the inclination formed at the crimping region. Consequently, the deformation of the crimping region is minimized, whereby the leakage of the electrolyte is prevented, and the safety of the battery is greatly improved.