Battery Electrode Plate Insulation Structure to Prevent Substrate Cracks
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Solution Overview
Problem
Insulating members in electrode plates cause stress concentration leading to cracks in the electrode substrate, which can result in quality defects, particularly in lithium-ion secondary batteries.
Innovation Solution
The electrode plate design incorporates first and second insulating portions with protrusions that cover the electrode tab and substrate, preventing stress concentration by overlapping the protrusions on both surfaces, thereby reducing the likelihood of cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating member is attached to cover the electrode tab and electrode substrate, then insulation is improved, but stress concentration occurs leading to cracks in the electrode substrate
Solution Approach 1:
The insulating member is designed with a protrusion at the position corresponding to the electrode tab. This local structural modification distributes the stress more evenly across the electrode substrate, preventing stress concentration at specific points. The protrusion creates a localized geometry change that reduces the harmful stress concentration effect while maintaining the overall insulation function.
Solution Approach 2:
The insulating member is designed with a protrusion that extends toward the electrode tab in advance, creating a buffer zone before the stress can concentrate on the electrode substrate. This preemptive structural design cushions the stress distribution, preventing cracks from forming in the first place rather than addressing them after they occur.
2Strength
If a protrusion is added to the insulating member, then stress concentration is reduced, but device complexity increases
Solution Approach 1:
Instead of modifying the entire insulating member structure, only a localized protrusion is added at the specific position corresponding to the electrode tab. This minimal structural change achieves the stress distribution effect without significantly increasing overall device complexity. The solution is focused and targeted rather than comprehensive and complex.
Data Source
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AI summary
An electrode plate for a battery includes: an electrode substrate; an electrode tab overlapping with a portion of the electrode substrate; a first insulating portion covering a portion of the electrode tab and a portion of the electrode substrate on a first surface, and including a plurality of first protrusions; and a second insulating portion covering a portion of the electrode tab and a portion of the electrode substrate on a second surface opposite to the first surface, and including a plurality of second protrusions.