Wound Electrode Group Joining with Curved Jig Bending
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Solution Overview
Problem
Conventional methods for joining a current collector plate to a wound electrode group in batteries result in irregular bending of uncoated portions, leading to suboptimal welding quality and potential contamination from cutting chips when slits are formed.
Innovation Solution
A method involving a jig that shifts in a curved path to uniformly bend uncoated portions of the electrode group, increasing the shifting amount towards the electrode group while decreasing it in the radial direction, allowing for improved alignment and laser welding with the current collector plates without slits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If slits are radially provided and uncoated portions are bent outward to form a flat welding surface, then the electrode group can be joined to the current collector plate, but the bending becomes irregular and welding quality deteriorates
Solution Approach 1:
The patent applies curvature by shifting the jig in a curved path during bending, where the shifting amount toward the electrode group gradually increases and the shifting amount in the radial direction gradually decreases. This curved motion pattern ensures uniform bending of multiple end parts, resolving the contradiction between ease of manufacture and manufacturing precision by replacing linear bending with a curved bending trajectory.
2Ease of manufacture
If slits are provided on uncoated portions to facilitate bending, then the electrode group can be joined, but cutting chips are generated causing contamination
Solution Approach 1:
The patent extracts and eliminates the harmful element (slits and cutting chips) from the process. Instead of providing slits on uncoated portions to facilitate bending, the invention achieves uniform bending through a curved shifting path of the jig, completely avoiding the generation of cutting chips and subsequent contamination while maintaining ease of manufacture.
3Device complexity
If the jig shifts in a straight line to bend end parts, then the process is simple, but uniform bending cannot be achieved
Solution Approach 1:
The patent introduces a curved shifting path for the jig, where the shifting amount toward the electrode group gradually increases and the shifting amount in the radial direction gradually decreases. This curved trajectory replaces the simple straight-line motion, achieving uniform bending of multiple end parts while maintaining reasonable process complexity through a systematic motion pattern.
Data Source
AI summary
A joining method for joining an electrode group of wound type in which a separator and an electrode plate are laminated and wound, and a current collector plate includes pressing a jig against multiple end parts of the electrode plate arranged in a radial direction of the electrode group, shifting the jig in a curved path such that the shifting amount in the direction toward the electrode group gradually increases and the shifting amount in the radial direction gradually decreases, bending the multiple end parts, and joining the multiple end parts thus bent and the current collector plate.