Current Collection Plate Wavy Welding Track for Stronger Cell Joining
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Solution Overview
Problem
Cylindrical battery cells face issues with poor welding quality due to broken line or spiral curve welding tracks that lead to over-welding at inflection points or overlapping points, affecting connection strength and current flowing area.
Innovation Solution
Designing a smooth wavy curve welding track on the current collection plate with no inflection points or overlapping points, using a combination of semicircular and linear portions to distribute welding energy evenly and increase the current flowing area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a broken line welding track is used, then the welding process can be simplified, but welding energy accumulates at inflection points causing over-welding and potential plate breakdown
Solution Approach 1:
The patent applies curvature by designing a wavy curve welding track instead of a broken line track. The smooth curved path eliminates sharp inflection points where laser beam direction changes abruptly, preventing energy accumulation and over-welding while maintaining manufacturing simplicity
Solution Approach 2:
The patent changes the geometric parameters of the welding track from linear segments with sharp angles to a continuous wavy curve with controlled radius of curvature. This parameter change ensures smooth laser beam traversal and uniform energy distribution along the welding path
2Area of stationary object
If a spiral curve welding track is used, then the welding track covers a larger area, but multiple overlapping points cause excessive welding energy and structural weld penetration
Solution Approach 1:
The patent uses a wavy curve design that provides adequate welding track coverage without creating overlapping paths. The curve extends along the radial direction with controlled amplitude and wavelength, ensuring broad coverage while maintaining a single-pass welding trajectory without overlaps
Solution Approach 2:
The welding track is segmented into multiple parallel wavy curves arranged along the radial direction of the current collection plate. This segmentation provides comprehensive coverage area while each segment remains distinct and non-overlapping, distributing welding energy uniformly across the welding surface
3Ease of operation
If the laser beam speed is reduced to zero at inflection points, then the welding direction can be changed, but welding energy accumulates excessively causing large welding depth and potential plate breakdown
Solution Approach 1:
The wavy curve design with controlled radius of curvature allows the laser beam to change direction smoothly without coming to a stop. The continuous curved path eliminates the need for zero-speed direction changes, preventing energy accumulation that would otherwise cause excessive welding depth and plate damage
Solution Approach 2:
The patent implements dynamic laser beam traversal along the wavy curve path, maintaining continuous motion without stopping at direction change points. This dynamic approach contrasts with static positioning at inflection points, ensuring uniform energy distribution and preventing localized overheating
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
Enhances welding quality by preventing over-welding, improving connection strength, and increasing the current flowing area between the current collection plate and the battery core, thus optimizing the welding process.
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
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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 (3), the back side is provided with a welding track (2), and the welding track (2) presents a smooth wavy curve.