Wound Electrode Body Separator Extension for Battery Terminal Joining
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Solution Overview
Problem
Existing secondary battery designs face challenges in achieving reliable joining between the wound electrode body and the electrode terminal, particularly due to potential deviations in the position of the separators, which can hinder the joining process.
Innovation Solution
The secondary battery design incorporates a wound electrode body with band-shaped separators and electrode sheets stacked and wound around a winding axis, featuring a rectangular and curved cross-sectional shape, where the separators extend inwardly to accommodate the electrode terminals, reducing the impact of slight deviations and ensuring secure joining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separators are positioned precisely to enable joining with electrode terminals, then joining reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies beforehand cushioning by designing the separator with an extended portion that protrudes beyond the electrode sheet in the winding direction. This extended portion creates a buffer zone that accommodates position deviations during manufacturing, ensuring that the joining portion of the electrode sheet can still be reliably connected to the electrode terminal even when slight deviations occur. The extended separator acts as a preliminary cushion against potential positioning errors.
Solution Approach 2:
The patent segments the separator into distinct functional portions: a main body portion that provides separation functionality and an extended portion that provides positioning and joining functionality. This segmentation allows the extended portion to specifically address the joining reliability issue without affecting the core separation function, and enables the electrode sheet to be joined at a designated area that is optimized for connection to the electrode terminal.
2Ease of manufacture
If the wound electrode body uses a conventional cylindrical shape, then manufacturing simplicity is maintained, but joining accuracy with electrode terminals deteriorates
Solution Approach 1:
The patent applies local quality by modifying only the local geometry of the wound electrode body cross-section. Instead of changing the entire cylindrical shape, the invention introduces a specific local feature: the extended portion of the separator that protrudes beyond the electrode sheet. This localized modification creates a dedicated joining area that improves connection accuracy while maintaining the overall simplicity of the wound electrode body structure and manufacturing process.
Data Source
AI summary
Better joining between a wound electrode body and an electrode terminal is implemented. In a cross section orthogonal to a winding axis of a wound electrode body of the secondary battery herein disclosed, two separators respectively extend more inward of the wound electrode body than electrode sheets. A portion of one separator forming an innermost circumference of the wound electrode body is bound in a first curved part. An inner circumferential side end of the one separator is between a junction part of an electrode sheet and an electrode terminal, and a first top around the winding axis. A portion of the other separator forming the innermost circumference is bent in a second curved part, and the inner circumferential side end of the other separator is between the junction part and a second top around the winding axis.