Electrode Seal Welding Sequence to Limit Current Collector Deformation
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Solution Overview
Problem
Thermal shrinkage of plastic seal components welded to current collectors in power storage devices leads to deformation of the current collectors, which can cause structural issues.
Innovation Solution
A method involving a polygonal current collector with seal components welded in multiple stages, where the target section dimensions are smaller than the side dimensions, and a jig with a curved corner portion is used to reduce thermal expansion and shrinkage, ensuring proper alignment and minimizing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If seal components are welded to the current collector by heating the seal components with a jig, then the seal components are securely attached to the current collector, but thermal shrinkage occurs in the seal components causing deformation of the current collector
Solution Approach 1:
The welding process is divided into multiple discrete welding positions along the seal component. Instead of heating the entire seal component at once, the jig sequentially contacts and heats only the target section at each welding position, reducing the overall thermal shrinkage while maintaining secure attachment through cumulative welding strength
Solution Approach 2:
The jig is designed to contact only a specific target section of the seal component at each welding position rather than the entire seal component. This localized heating approach minimizes thermal shrinkage in non-welded areas while achieving sufficient welding strength at the target section
2Object-affected harmful factors
If the dimension of the target section is reduced to minimize thermal shrinkage, then the shrinkage force transmitted to the current collector is reduced, but the welding coverage along the side may be insufficient
Solution Approach 1:
The seal component is divided into multiple target sections corresponding to different welding positions. Each target section has a reduced dimension to minimize thermal shrinkage, but the cumulative effect of welding across multiple positions ensures complete coverage along the entire side of the current collector
Solution Approach 2:
The method performs multiple welding operations in sequence along the seal component. By preparing and executing welding at each target section systematically, the process ensures complete welding coverage is achieved while each individual welding operation uses reduced target section dimensions to minimize shrinkage force
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces deformation of the current collector by minimizing thermal shrinkage of seal components, thereby maintaining structural integrity and reducing welding defects.
Implementation Method 1
thermal shrinkage occurs in parts of the seal components welded to the current collector... the larger the parts of the seal components welded to the current collector, the larger the amount of thermal shrinkage of the seal components becomes
Implementation Method 2
the amount of thermal shrinkage of the seal components increases, the shrinkage force transmitted to the current collector due to the thermal shrinkage of the seal components increases
Data Source
AI summary
A method for producing an electrode is provided. The electrode includes a current collector having a polygonal shape with at least one side exceeding 1 meter, an active material layer provided on a surface of the current collector, and a seal component welded to the surface of the current collector. The method includes a disposing step that disposes the seal component on the surface of the current collector along the side, and a welding step that presses a target section against the current collector and heats the target section. The welding step is performed multiple times between opposite end portions of the seal component. In the second and subsequent welding steps, the target section is a part of the seal component that is at least partially shifted from a target section of the previous welding step.