Spot Welding Jig Partitioned Barriers for Battery Cell Adhesion
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Solution Overview
Problem
Conventional spot welding jigs fail to maintain adequate adhesion of electrode leads during laser spot welding, leading to deteriorated weld quality due to incomplete bending or poor assembly, especially in spot welding where peripheral adhesion is critical.
Innovation Solution
A spot welding jig with a passing portion and vertically partitioned spaces to guide the welding laser, featuring a welding guide block and connecting rods with a coil spring for precise alignment and pressure, and a mask for forming tornado patterns to enhance weld quality and prevent spatter interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional welding jig is used to press electrode leads onto a bus bar, then the electrode leads are pressed during welding, but the adhesion of the periphery of each welding target region is not maintained due to incomplete bending or poor assembly
Solution Approach 1:
The pressing portion is divided into multiple pressing units, each equipped with an independent pressing element that can apply pressure to specific regions of the electrode leads. This segmentation allows precise control of adhesion at different locations, particularly maintaining peripheral adhesion around welding target regions while accommodating variations in bending completeness or assembly quality.
2Ease of manufacture
If spot welding is performed without partitioning the welding space, then the welding process is simple, but spatter interferes with the welding quality and adhesion is deteriorated
Solution Approach 1:
The welding space is partitioned into multiple separated regions using pressing units that create physical barriers between adjacent welding target regions. This partitioning prevents spatter generated during spot welding from spreading to surrounding areas, thereby maintaining weld quality and preventing adhesion deterioration without significantly complicating the welding process.
3Productivity
If the electrode leads are not flatly pressed to the bus bar, then the assembly process is faster, but holes are created and adhesion is deteriorated
Solution Approach 1:
The pressing elements are designed to be movable and adjustable, allowing them to adapt to variations in electrode lead positioning and bending states. This dynamic capability enables the system to achieve flat pressing contact even when assembly conditions vary, preventing hole creation and adhesion deterioration while maintaining efficient assembly speeds through automated adjustment.
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
The jig maintains adhesion of electrode leads around spot welding patterns, prevents spatter interference, and ensures consistent weld quality by partitioning the welding space and using a tornado pattern for improved strength and reduced material scattering.
Implementation Method 1
a mask for forming tornado patterns to enhance weld quality
Implementation Method 2
laser spot welding is performed to an electrode lead of a pouch-type secondary battery cell
Data Source
AI summary
A spot welding jig is provided. The spot welding jig presses electrode leads of battery cells to be closely adhered onto a bus bar when spot welding is performed to the electrode leads interposed on the bus bar along a width direction of the electrode leads. The spot welding jig includes a passing portion through which a welding laser passes, and a predetermined number of barriers configured to vertically partition an inner space of the passing portion.