Current Collection Plate Wavy Weld Track for Battery Cells
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Solution Overview
Problem
Existing battery cell manufacturing techniques face challenges with poor welding quality due to broken line or spiral welding tracks, leading to inflection points or overlapping points that result in over-welding and structural weld penetration.
Innovation Solution
A current collection plate with a smooth wavy curve welding track is designed, eliminating inflection points and overlapping points, thereby reducing the risk of over-welding and improving the uniformity and strength of the weld.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a broken line welding track is used, then the welding process can be completed, but the laser energy accumulates at inflection points causing excessive welding depth and risk of welding through
Solution Approach 1:
The patent applies curvature by replacing the broken line welding track with a smooth wavy curve welding track. This curvature design eliminates inflection points where laser energy would accumulate, ensuring uniform laser energy distribution along the entire welding path and preventing excessive welding depth at specific locations.
Solution Approach 2:
The patent changes the geometric parameters of the welding track from a broken line pattern to a smooth wavy curve pattern. This parameter change modifies the trajectory characteristics to eliminate sharp turns and inflection points, thereby controlling laser energy accumulation and achieving consistent welding depth throughout the process.
2Area of stationary object
If a spiral curve welding track is used, then the welding coverage is improved, but multiple overlapping welding points cause over-welding and structural weld penetration
Solution Approach 1:
The patent uses a smooth wavy curve welding track instead of a spiral curve, maintaining the curved path benefit for coverage while eliminating overlapping sections. The wavy pattern ensures that the laser beam traverses each area exactly once, preventing the multiple passes that cause over-welding and structural penetration in spiral patterns.
Solution Approach 2:
The welding track is segmented into multiple wave cycles that cover the required area without overlapping. Each wave segment is designed to contribute uniquely to the overall welding coverage, ensuring that no region receives excessive laser energy from repeated passes while still achieving comprehensive coverage.
3Adaptability or versatility
If inflection points are present in the welding track, then the welding path can follow complex geometries, but laser energy accumulation occurs causing poor welding quality
Solution Approach 1:
The patent maintains welding path flexibility through the use of a smooth wavy curve that can adapt to complex geometries while eliminating inflection points. The continuous curvature of the wavy pattern allows the laser beam to follow complex paths without sharp directional changes, ensuring uniform energy distribution throughout the welding process.
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 smooth wavy curve welding track enhances the connection strength and current flowing area between the current collection plate and the battery core, while preventing over-welding, thus improving the overall welding quality of battery cells.
Implementation Method 1
Cylindrical battery cells generally use laser welding to weld a current collection plate and a battery core of one battery cell together
Data Source
AI summary
The present disclosure provides a current collection plate and a battery cell. the battery cell includes the current collection plate, and the current collection plate includes a welding side and a back side arranged oppositely. The welding side is configured to be welded to a battery core, the back side is provided with a welding track, and the welding track presents a smooth wavy curve.