Secondary Battery Crimp Structure Sealing Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current secondary batteries lack sufficient safety features, necessitating improvements in their design to enhance sealing and pressure resistance while maintaining energy density and compact size.
Innovation Solution
A secondary battery design featuring a cylindrical container with a bent part forming a crimp structure, utilizing a gasket and safety valve mechanism, where the outer diameter of the container is between 25 mm and 27 mm, and the tip part's length is between 8.0% and 10.0% of the outer diameter, ensuring effective sealing and pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer diameter of the container member is increased to improve safety and sealing strength, then the sealing property is improved, but the battery size and energy density are worsened
Solution Approach 1:
The bent part of the container member is designed with specific local geometric features (tip part length ratio of 8.0-10.0% of outer diameter) to concentrate sealing function in a localized region, achieving superior sealing without increasing overall battery dimensions
Solution Approach 2:
The patent specifies precise parameter ranges (outer diameter 25-27 mm, tip part length ratio 8.0-10.0%) to optimize the balance between sealing strength and battery size, ensuring safety requirements are met while maintaining compact form factor
2Reliability
If the crimp structure is strengthened to improve sealing, then the sealing strength is improved, but the manufacturing complexity increases
Solution Approach 1:
The crimp structure is divided into distinct functional segments (bent part, tip part, flange part) with the tip part serving as a dedicated sealing element, simplifying the overall design while maintaining effective sealing
Solution Approach 2:
The bent part is designed with a curved geometry where the tip part forms an arc that naturally conforms to the cover member, creating effective sealing through geometric shape rather than complex mechanical features
3Reliability
If the tip part length is increased to improve sealing contact, then the sealing property is improved, but the structural stability is worsened
Solution Approach 1:
The tip part length is precisely controlled within 8.0-10.0% of the outer diameter, optimizing the balance between sufficient sealing contact length and maintaining structural rigidity of the bent part
Solution Approach 2:
The container member is made of metal material providing inherent structural stability, while the geometric design of the tip part (curved arc shape) provides enhanced sealing contact without compromising overall structural integrity
Data Source
AI summary
A secondary battery includes a container member, a battery device, a cover member, and a sealing member. The container member includes a bent part defining an open end part. The battery device is contained inside the container member. The cover member closes the open end part. The sealing member is interposed between the bent part and the cover member. The cover member includes a first bottom surface, a first top surface, and a first side surface. The first bottom surface is opposed to the battery device. The first top surface is positioned on an opposite side to the first bottom surface. The first side surface is coupled to each of the first bottom surface and the first top surface. The bent part is provided along the first bottom surface, the first side surface, and the first top surface in this order and includes a tip part. The tip part is provided along the first side surface and the first top surface in this order. The container member has an outer diameter of greater than or equal to 25 mm and less than or equal to 27 mm in an intersecting direction. The outer diameter is defined based on the bent part. The intersecting direction intersects with a placing direction in which the battery device is placed into the container member. A proportion of a length of the tip part in the intersecting direction to the outer diameter of the container member is greater than or equal to 8.0% and less than or equal to 10.0%.