Secondary Battery Current Interrupt Device Insulant Film
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Solution Overview
Problem
Existing secondary battery designs face challenges in reliably preventing electrical reconnection between the current interrupt valve and current collector after pressure interruption, leading to potential safety issues and reduced battery performance.
Innovation Solution
A secondary battery design featuring a current interrupt device with a conductive thin plate current interrupt valve and a thinned section that breaks when pressure exceeds a specified level, using an insulant film to prevent reconnection by interposing between the broken edges, ensuring consistent electrical interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the current collector is prevented from being drawn toward the current interrupt valve when reversed, then the broken portion deformation is reduced, but additional structural constraints are required
Solution Approach 1:
The insulant layer serves as a mediator that prevents direct contact between the current collector and the current interrupt valve when the valve is reversed. This intermediary layer controls the deformation of the broken portion without requiring complex structural constraints, as the insulant naturally prevents the drawing action while maintaining simplicity in the overall structure.
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
The solution effectively maintains electrical disconnection even after pressure reduction, enhancing safety and performance by preventing reconnection and ensuring reliable battery operation.
Implementation Method 1
the thinned section is broken around a portion that is joined to the current interrupt valve, and the connecting terminal is electrically interrupted from the electrode body
Implementation Method 2
the insulant is disposed in a portion where the thinned section is broken and is interposed between both edges of the broken thinned section after the thinned section is broken
Implementation Method 3
When the gas pressure in the battery case is increased to or above the specified level, and the current interrupt valve is raised to the connecting terminal side
Data Source
AI summary
In a secondary battery (10) suggested herein, when a gas pressure in a battery case (12) is increased to or above a specified level and a current interrupt valve (26) is consequently raised to a connecting terminal (21) side, a thinned section (71) is broken around a portion that is joined to the current interrupt valve 26, the connecting terminal (21) and an electrode body are electrically interrupted from each other. An insulant (27) is disposed in a portion where the thinned section (71) is broken, and is interposed between both edges of the broken thinned section (71) after the thinned section (71) is broken.