Battery Module Welding Seam Venting for Exhaust Gas Discharge
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Solution Overview
Problem
During welding, exhaust gases such as carbon dioxide and hydrogen accumulate between workpieces and enter the welding seam, reducing its strength due to inadequate discharge.
Innovation Solution
A welding assembly with an exhaust channel between the weldments, where at least one side of the welding seam includes this channel, allowing gases to be discharged externally and preventing them from entering the seam, featuring convex or concave portions and a coating layer with a lower boiling point than the base layer to facilitate gas removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is performed at the overlapping position of workpieces, then joining between workpieces is achieved, but exhaust gases cannot be discharged in time and enter the welding seam, reducing welding seam strength
Solution Approach 1:
The welding structure is segmented by introducing an exhaust channel that divides the welding region into a discharge channel and a welding seam region, allowing exhaust gases to be directed away from the welding seam while maintaining the overlapping join configuration
Solution Approach 2:
An exhaust channel acts as an intermediary structure between the overlapping workpieces, providing a dedicated pathway for exhaust gas evacuation that prevents gas accumulation and intrusion into the welding seam, thereby protecting weld quality
2Strength
If workpieces are heated to partially melt during welding, then joining is achieved, but exhaust gases form and accumulate between workpieces, entering the welding seam and reducing strength
Solution Approach 1:
The harmful exhaust gases are extracted from the welding region through the exhaust channel, removing the source of contamination before gases can enter and compromise the welding seam integrity
Solution Approach 2:
The exhaust channel is pre-configured in the workpiece structure before welding begins, establishing the gas evacuation pathway in advance to prevent exhaust gas accumulation and ensure continuous reliable welding operation
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 solution effectively prevents exhaust gases from entering the welding seam, enhancing the strength and reliability of the weld by ensuring timely discharge of gases, thus reducing the risk of hole blasting and spattering phenomena.
Implementation Method 1
the coating layer includes one or more of zinc and magnesium... A boiling point of the coating layer is lower than a melting point of the base layer
Data Source
AI summary
The present application provides a welding assembly and a battery module. The welding assembly includes: a first weldment; and a second weldment, welded and fixed with the first weldment to form a welding seam; where, at least one side of the welding seam is provided with an exhaust channel; and the exhaust channel is located between the first weldment and the second weldment. In the present application, an exhaust gas generated during welding can be discharged from the exhaust channel to prevent it from entering the welding seam to reduce the strength of the welding seam.