Battery Cell Current Collector for Dissimilar-Metal Weld Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The reliability of the weld between the current collecting component and the electrode lead-out portion in battery cells is compromised due to differences in welding performance between materials, leading to impaired molten pool quality and reduced connection reliability.
Innovation Solution
The current collecting component is designed with a first connecting portion and a second connecting portion, where the second connecting portion has a melting point closer to that of the electrode lead-out portion, allowing for smoother fusion and improved weld quality by selecting materials with appropriate melting point differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different materials are used for the tab and electrode lead-out portion, then material selection flexibility is improved, but welding quality deteriorates due to difference in welding performance
Solution Approach 1:
The patent introduces an intermediate component (the current collecting component with first and second connecting portions) that mediates between the tab and electrode lead-out portion. This intermediary allows each component to be optimized for its specific function while maintaining reliable electrical connection, resolving the conflict between material flexibility and welding quality.
Solution Approach 2:
The current collecting component is divided into multiple segments (first connecting portion welded to tab, second connecting portion welded to electrode lead-out portion). This segmentation allows different portions to be made of different materials optimized for their specific welding requirements, thereby maintaining both material flexibility and welding quality.
2Adaptability or versatility
If materials with different melting points are used for welding, then material compatibility is improved, but molten pool quality deteriorates
Solution Approach 1:
The patent carefully controls the melting point parameter of the materials used in the current collecting component. By selecting materials with melting points within a specific range (0.75×T3≤T2≤1.3×T3), the patent achieves both material compatibility for reliable connection and maintains molten pool quality during welding.
Solution Approach 2:
Different portions of the current collecting component have different material properties tailored to their specific functions. The first connecting portion is optimized for welding to the tab, while the second connecting portion is optimized for welding to the electrode lead-out portion, with each having appropriate melting point characteristics for its specific welding application.
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
This design enhances the welding quality and reliability of the connection between the current collecting component and the electrode lead-out portion, reducing welding defects and improving the overall performance of the battery cell.
Implementation Method 1
The second connecting portion is welded to the first electrode lead-out portion. A melting point T2 of the second connecting portion is closer to a melting point T3 of the first electrode lead-out portion than a melting point T1 of the first connecting portion
Implementation Method 2
the quality of the weld at the molten pool is impaired due to a difference in welding performance between different materials
Data Source
AI summary
A battery cell includes an electrode assembly, a shell assembly, and a current collecting component. The electrode assembly includes a first tab. The shell assembly is configured to accommodate the electrode assembly. The shell assembly includes a first electrode lead-out portion. The current collecting component includes a first connecting portion and a second connecting portion connected to each other. The first connecting portion is electrically connected to the first tab. The second connecting portion is welded to the first electrode lead-out portion. A melting point of the second connecting portion is closer to a melting point of the first electrode lead-out portion than a melting point of the first connecting portion.