Secondary Battery Insulation Member Flange Design
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Solution Overview
Problem
Secondary batteries are prone to electrical short circuits due to the intrusion of foreign substances, such as salt water, which can cause malfunctions by creating a conductive path between different polarities.
Innovation Solution
The implementation of a secondary battery design that includes a cap plate, a terminal plate, an insulation member, and a short circuit preventing portion on at least one of the terminal plate or insulation member, which prevents electrical short circuits by blocking the flow of foreign materials. This can be achieved through various geometries such as protrusions, inclined surfaces, or grooves that limit the flow of foreign substances, thereby preventing contact between the terminal plate and the cap plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foreign substances such as salt water intrude between the terminal plate and cap plate, then electrical short circuit occurs between different polarities, but the basic battery structure without additional preventing features allows such intrusion
Solution Approach 1:
The terminal plate is divided into multiple isolation regions separated by groove portions, creating distinct zones that prevent foreign substances from forming continuous conductive paths between different polarities. The groove portions act as segmentation barriers that break up potential short circuit routes.
Solution Approach 2:
The insulation member is positioned between the terminal plate and cap plate to prevent direct contact and electrical short circuits. This intermediary component provides electrical isolation and prevents foreign substances from creating conductive paths between opposing polarities.
2Reliability
If the insulation member surrounds the terminal plate completely, then short circuit prevention is enhanced, but manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The insulation member is divided into multiple isolation regions that correspond to different terminal areas. These segmented regions can be manufactured and positioned independently, simplifying the overall assembly process while maintaining comprehensive short circuit prevention coverage.
Data Source
AI summary
A secondary battery includes an electrode assembly; a case accommodating the electrode assembly; a cap plate sealing the electrode assembly within the case; a terminal plate on the cap plate and electrically connected to the electrode assembly; and an insulation member between and contacting the cap plate and the terminal plate, wherein the insulation member has a peripheral flange that extends away from the terminal plate.