Cylindrical Secondary Battery Cap Assembly With Lower Internal Resistance
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Solution Overview
Problem
Existing secondary batteries face challenges in minimizing component resistance and internal resistance, leading to reduced output and increased material costs.
Innovation Solution
A secondary battery design that includes a cylindrical can with an electrode assembly, a current collector plate, and a safety vent connected through an electrode tab with a flat plate shape, minimizing internal resistance by eliminating the need for a current interrupting device and insulating ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional components (current interrupting device, insulating ring) are used in the cap assembly, then safety and insulation are ensured, but component resistance and internal resistance increase, reducing output
Solution Approach 1:
The patent removes the current interrupting device and insulating ring from the cap assembly structure. By extracting these components that caused increased resistance, the invention achieves lower internal resistance and improved output while maintaining safety through alternative design approaches in the cap assembly
Solution Approach 2:
The safety vent is directly electrically connected to the current collector plate through the electrode tab, merging the safety function and electrical conduction function into a integrated structure. This eliminates intermediate components and reduces the number of electrical connections, thereby minimizing component resistance
2Reliability
If traditional cap assembly structure with multiple components is used, then safety functions are provided, but material costs increase
Solution Approach 1:
The patent extracts and removes the current interrupting device and insulating ring from the cap assembly. By eliminating these separate components, the invention reduces material costs and simplifies the manufacturing process while maintaining essential safety functions through the redesigned cap assembly structure
Solution Approach 2:
The cap assembly is designed to perform multiple functions (safety venting, electrical conduction, sealing) through a simplified structure. The safety vent directly connects to the current collector plate, making the cap assembly a multi-functional component that reduces overall part count and material costs
3Reliability
If multiple components are used in the electrical connection path, then connection reliability is ensured, but component resistance increases and heat generation occurs
Solution Approach 1:
The invention merges the safety vent and current collector plate into a directly connected structure through the electrode tab. This consolidation reduces the number of electrical connections from multiple components to a direct connection, minimizing component resistance and reducing energy loss in the form of heat generation
Data Source
AI summary
An embodiment of the present invention relates to a secondary battery, and the problem to be solved by the present invention is to provide a secondary battery in which output is improved by minimizing component resistance or internal resistance, and in which material costs may be reduced. To this end, disclosed is a secondary battery comprising: a cylindrical can having an opening; an electrode assembly accommodated in the opening of the cylindrical can and wound in a cylindrical form; a current collector plate electrically connected to the electrode assembly; and a safety vent electrically connected to the current collector plate and sealing the opening of the cylindrical can.