Battery Cap Assembly for Stable Electrode Terminal Coupling
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Solution Overview
Problem
Secondary batteries are susceptible to malfunction due to vibration and shock, which can affect their internal components and reduce their performance.
Innovation Solution
A secondary battery design with enhanced coupling force of electrode terminals and increased internal space efficiency, achieved through a gasket with a flange portion between the electrode terminal and cap plate, along with a fastening plate and retainer system, to stabilize the terminals and maximize internal space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode terminal is directly connected to the cap plate, then the structure is simple, but the coupling force is insufficient and the terminal is vulnerable to vibration and shock
Solution Approach 1:
The gasket serves as an intermediary component between the electrode terminal and the cap plate. The gasket includes a flange portion that extends between the upper surface of the cap plate and the electrode terminal, providing a cushioning and stabilizing effect that enhances coupling force and protects against vibration and shock.
Solution Approach 2:
The cap assembly is segmented into multiple functional components: the cap plate, the gasket with flange portion, and the electrode terminal with flange portion. This segmentation allows each component to perform its specific function - the cap plate provides structural support, the gasket provides cushioning and sealing, and the terminal provides electrical connection.
2Reliability
If the gasket extends along the flange portion of the electrode terminal, then the coupling force increases, but the internal space is reduced
Solution Approach 1:
The gasket's flange portion is strategically positioned only where needed - between the cap plate and the electrode terminal's flange portion. This localized placement provides enhanced coupling force at the critical connection point while minimizing the gasket's overall volume and its impact on the battery's internal space.
Data Source
AI summary
A secondary battery includes: a case having an internal space; an electrode assembly accommodated in the internal space of the case; a current collector electrically connected to the electrode assembly; and a cap assembly. The cap assembly includes: a cap plate sealing the case; an electrode terminal coupled to the current collector through the cap plate; and a gasket between the electrode terminal and the cap plate. The gasket has a flange portion, and the flange portion of the gasket is between an upper surface of the cap plate and the electrode terminal.