Flat Wound Electrode Tab Positioning for Battery Yield
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Solution Overview
Problem
The manufacturing of wound electrode bodies in batteries often results in tabs being displaced from defined positions, leading to reduced yield and productivity due to difficulties in forming the tabs into a collector foil.
Innovation Solution
A method of manufacturing batteries with controlled winding and molding processes to ensure that the distance between specific tabs satisfies G2 < S, where G1=0, thereby reducing tab displacement and improving productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tabs are positioned on the outer periphery of the wound electrode body, then the electrode structure can be formed, but the tabs are displaced from defined positions making it difficult to form the collector foil
Solution Approach 1:
The patent applies parameter changes by precisely controlling the G1 distance (distance between middle of base width of first tab and middle of base width of second tab) to be 0mm, and setting G2 distance (distance between middle of base width of third tab and middle of base width of fourth tab) to satisfy G2≤S. This parameter control ensures tabs are properly positioned on the outer periphery without displacement, enabling both accurate collector foil formation and high productivity
2Manufacturing precision
If G1 is set to 0 and G2 is controlled to satisfy G2≤S, then tab displacement is reduced, but the manufacturing process requires precise control
Solution Approach 1:
The patent applies preliminary action by pre-defining the tab positions and dimensions before the winding process. The tab configuration is designed in advance with specific G1=0 and G2≤S parameters, allowing the winding process to simply follow this predetermined configuration, thereby reducing actual process complexity while achieving high precision
Data Source
AI summary
A technology for obtaining a battery including a wound electrode body with high productivity is provided. In a preferred aspect of the battery manufacturing method disclosed herein, the method includes: winding a separator, a first electrode, and a second electrode around a winding core to produce a wound body; molding the wound body into a flat shape; and arranging, in a battery case, the wound electrode body produced.