Welded Electrode Terminal Structure for Low-Resistance Battery Joints
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Solution Overview
Problem
The presence of fine gaps at the interface between the members of the electrode terminal in secondary batteries increases interface resistance, hindering the formation of a favorable conductive path.
Innovation Solution
The electrode terminal design includes a first member with a connection part inserted into a non-through concave hole of a second member, where the interface is welded, reducing gaps and improving conductivity, especially when different metals are used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple metal members are welded together to form a conductive path, then the electrode terminal can be constructed with modular components, but fine gaps at the interface increase resistance and reduce conductivity
Solution Approach 1:
The insertion hole is formed with a concave shape beforehand to pre-position the first member in optimal contact. This preliminary geometric configuration ensures that when welding occurs, the interface starts with reduced gap formation, leading to better conductivity while maintaining modular construction benefits
Solution Approach 2:
The insertion hole geometry is changed from a simple cylindrical shape to a concave shape with specific curvature parameters. This parameter change in the hole geometry allows the first member to sit deeper and make better contact with the second member, reducing interface gaps and improving conductivity without compromising the modular design
2Adaptability or versatility
If different metals are used for the first and second members, then the electrode terminal can optimize electrical and mechanical properties, but the resistance at the contact interface increases
Solution Approach 1:
The concave insertion hole creates a localized region of improved contact quality at the interface. By concentrating the contact area in the concave region, the design ensures optimal local quality of the joint between different metals, reducing interface resistance while allowing the use of dissimilar materials with different electrical and mechanical properties
3Ease of manufacture
If a through-hole is used for the insertion hole, then assembly is simplified, but the opposite surface exposes the first member and welding marks which complicates subsequent connections
Solution Approach 1:
The concave shape of the insertion hole is designed in advance to contain the first member and welding marks within the hole volume. This preliminary geometric design prevents exposure of problematic surfaces on the opposite side, eliminating the need for additional surface preparation steps while maintaining assembly simplicity
Solution Approach 2:
The first member is nested within the concave insertion hole of the second member, with the welding interface contained inside the hole. This nesting arrangement hides the welding marks and exposed member surfaces, providing a clean outer surface for subsequent connections without complicating the manufacturing 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
This configuration enhances conductivity and joint strength at the contact interface, facilitating easier connection with bus bars and reducing resistance in the conductive path.
Implementation Method 1
The first member and the second member are welded to each other at an interface between the first member and the second member situated in an inside of the insertion hole
Data Source
AI summary
A technology is provided which improves the conductivity at the electrode terminal in a secondary battery. The technology herein disclosed provides an electrode terminal of a secondary battery. The electrode terminal includes a first member made of a metal, and a second member made of a metal. The first member has a connection part to be connected to the second member. The second member has an insertion hole for allowing the connection part of the first member to be inserted thereinto. At the interface between the first member and the second member in the inside of the insertion hole, the first member and the second member are welded to each other.