Cylindrical Battery Sealing Structure With Integrated Current Interruption
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Solution Overview
Problem
The existing cylindrical battery designs require multiple components for the sealing member to achieve a current interruption function, increasing processing complexity and costs due to the need for accurate and complicated shapes.
Innovation Solution
A cylindrical battery design where a single metal component with an easy fracture part serves as both the sealing member and the current interruption mechanism, integrated with a resin component for electrical insulation and gas exhaust, reducing the number of components and processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple components (valve member, insulating member, metal body) are used to construct the sealing member with current interruption function, then the safety and current interruption reliability are improved, but the device complexity and manufacturing burden increase
Solution Approach 1:
The patent combines the valve member, insulating member, and metal body into a single integrated sealing member structure. The insulating member is formed as an integral part of the sealing member, with the valve member and metal body positioned relative to it without requiring separate assembly of these three components, thereby reducing device complexity while maintaining current interruption reliability
Solution Approach 2:
The sealing member is designed to perform multiple functions simultaneously: sealing the battery container, providing current interruption capability through the valve member and metal body configuration, and maintaining structural integrity. This multi-functional design eliminates the need for separate dedicated components for each function, reducing overall complexity
2Reliability
If each component has complicated and highly accurate processed shape to ensure reliable operation during battery abnormality, then the current interruption function reliability is improved, but the manufacturing precision requirements and processing burden increase
Solution Approach 1:
By forming the insulating member and other components as an integrated structure, the patent reduces the number of separate precision-critical interfaces and assembly points. The integrated design simplifies the overall manufacturing process while ensuring reliable operation during battery abnormalities
3Reliability
If the number of components constituting the sealing member is increased, then the current interruption function and gas exhaust function are improved, but the productivity and manufacturing efficiency decrease
Solution Approach 1:
The patent integrates multiple functional components into a single sealing member structure that can be manufactured as one piece or pre-assembled unit, thereby maintaining safety functions while improving manufacturing efficiency and productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces the number of components in the sealing member, simplifying the manufacturing process, reducing processing time, and lowering costs while maintaining the necessary safety and functionality.
Implementation Method 1
the metal component includes an easy fracture part radially inside a connection part between the metal component and the electrode lead
Implementation Method 2
a resin component having electrical insulation disposed between the exterior can and the sealing member
Implementation Method 3
the metal component is crimped caulked and fixed by the exterior can with the resin component interposed therebetween
Data Source
AI summary
A cylindrical battery includes: an outer can in the shape of a bottomed cylinder; a sealing body which closes one end of the outer can; an electrode body disposed inside the outer can; and an insulating resin component disposed between the outer can and the sealing body. The sealing body includes a metal component which is connected to a positive electrode lead that leads out from the electrode body. The metal component has an easily broken portion radially inward of the connecting portion of the metal component and the positive electrode lead, and is crimp-secured by means of the outer can, with the resin component interposed therebetween. The resin component is crimp-secured by means of the metal component, on the radially inner side of the metal component relative to the easily broken portion.