Folded Electrode Assembly With Z-Shaped Separator Restraint
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Solution Overview
Problem
Existing secondary batteries face issues with electrode plate mobility during manufacturing and use, which can lead to safety risks and increased separator material costs.
Innovation Solution
The electrode assembly is designed with a Z-shaped separator that contacts ends of first and second electrode plates, and a fixing part is used to constrain the electrode plates, reducing mobility and minimizing separator contact to reduce material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separator is made longer to fully cover the electrode plates, then the safety and coverage are improved, but the material cost and device complexity increase
Solution Approach 1:
The separator is divided into multiple sections: a first separator section covering the first electrode plate and a second separator section covering the second electrode plate, with different lengths optimized for each electrode plate's requirements. This segmentation allows the separator to provide adequate coverage and safety for each electrode while minimizing overall material usage.
Solution Approach 2:
Different sections of the separator are designed with different lengths and configurations tailored to the specific needs of each electrode plate. The first separator section extends further to accommodate the longer first electrode plate, while the second separator section is shorter for the second electrode plate, optimizing both safety and material efficiency locally.
2Reliability
If the separator is made longer to ensure full coverage, then the safety is improved, but the device complexity increases
Solution Approach 1:
The separator is divided into a first separator section and a second separator section with different lengths, allowing each section to be optimized independently for its respective electrode plate while maintaining overall safety without excessive complexity.
Solution Approach 2:
The separator employs an asymmetric design where the first separator section has a different length than the second separator section, matching the asymmetric configuration of the electrode plates. This asymmetric approach simplifies the overall structure by eliminating the need for excessive symmetry while maintaining safety.
3Ease of manufacture
If the electrode plates are allowed to move freely during assembly, then the ease of manufacture is improved, but the safety and positioning precision deteriorate
Solution Approach 1:
The separator is pre-configured with specific lengths and configurations that automatically guide and position the electrode plates during assembly. The first separator section and second separator section are designed to accommodate the electrode plates in their correct positions, ensuring precise positioning without requiring complex external fixing mechanisms.
Data Source
AI summary
A secondary battery including: an electrode assembly including first and second electrode plates alternately stacked with a separator interposed therebetween and being folded in a state of being in contact with ends of the first electrode plate and the second electrode plate; and a case accommodating the electrode assembly.