Wound Electrode Core Insulation Structure Against Center Collapse
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Solution Overview
Problem
Secondary batteries face instability and reliability issues due to the collapse of the electrode assembly's central portion after electrolyte injection.
Innovation Solution
A secondary battery design that includes a core insulation member coupled to the winding center of the electrode assembly, featuring an insertion part and a flange part to support the electrode assembly, preventing collapse and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolyte is injected into the battery, then the battery becomes operational, but the central portion of the electrode assembly collapses
Solution Approach 1:
The core insulation member is installed at the winding center of the electrode assembly before electrolyte injection, proactively preventing the collapse that would otherwise occur after injection. This preliminary structural support ensures the electrode assembly maintains its integrity when the electrolyte is subsequently introduced and the battery becomes operational.
2Stability of the object's composition
If the electrode assembly is supported at the center, then stability is enhanced, but device complexity increases
Solution Approach 1:
The core insulation member is divided into two functional segments: an insertion part that fits into the winding center and a flange part that provides external support and alignment. This segmentation allows the single component to simultaneously perform multiple support functions while maintaining a relatively simple overall structure that does not significantly increase device complexity.
Data Source
AI summary
The present invention relates to a secondary battery supporting the center part of an electrode assembly to enhance stability and reliability. For example, disclosed is a secondary battery comprising: an electrode assembly formed by winding a first electrode plate, a separator and a second electrode plate; a case for accommodating the electrode assembly; a current collection plate electrically connected to the first electrode plate and coupled to the upper part of the electrode assembly; and a core insulation member coupled to a winding center of the electrode assembly at the upper part of the current collection plate, wherein the core insulation member includes an insertion part having an inner hole, and a flange part extending in the horizontal direction from the upper end of the insertion part.