Sealed Battery Terminal Joint With Plated Anchor Layer
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Solution Overview
Problem
Current joining techniques for heterometal interjunctions in sealed and assembled batteries fail to achieve high junction strength and low electrical resistance, particularly when connecting metal members of different materials.
Innovation Solution
A new joining technique using a plated layer with recessed portions on the surfaces of internal and external terminals, where the plated layer penetrates into these recessed areas, providing an anchor effect and enhancing the strength and conductivity of the connection without being affected by the difference in metal materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If laser welding or conventional joining techniques are used for heterometal interjunction, then the connecting portion can be formed, but the junction strength and electrical resistance are insufficient
Solution Approach 1:
The invention applies different surface treatments to different regions of the metal members. Specifically, one surface is treated to have a rough surface with recessed portions while the other surface remains relatively smooth. This local differentiation allows the plated layer to penetrate into the recessed portions and form strong mechanical interlocking in specific areas, achieving both high junction strength and low electrical resistance at the connecting portion between internal terminal and external terminal.
Solution Approach 2:
The invention performs surface treatment (creating rough surface with recessed portions) and plated layer formation before the final joining process. By preliminarily preparing the surfaces with recessed portions and applying the plated layer in advance, the metal members are ready for optimal joining, ensuring both high strength and low electrical resistance are achieved when the connecting portion is formed.
2Ease of manufacture
If heterometal interjunction is performed without special surface treatment, then the manufacturing process is simple, but the connecting portion lacks sufficient strength and conductivity
Solution Approach 1:
The invention creates a rough surface with recessed portions on one of the metal members before applying the plated layer. These recessed portions act as porous structures that allow the plated layer to penetrate and form mechanical interlocking. This approach maintains relative manufacturing simplicity while significantly improving the strength and conductivity of the heterometal connecting portion compared to conventional smooth-surface joining.
3Adaptability or versatility
If the internal terminal and external terminal are made of different metal materials, then design flexibility is improved, but the joining difficulty and electrical resistance increase
Solution Approach 1:
The invention introduces a plated layer as an intermediary between the internal terminal and external terminal made of different metal materials. This plated layer, applied on the rough surface with recessed portions, serves as a mediator that facilitates joining between dissimilar metals, reducing joining complexity and electrical resistance while maintaining the flexibility to use different metal materials for design optimization.
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 technique forms robust connections with high strength and low electrical resistance, improving the endurance and performance of sealed and assembled batteries by effectively joining terminals with different metal compositions.
Implementation Method 1
a part of the plated layer penetrates into the recessed portions... An anchor effect can be generated by causing a part of the plated layer to penetrate into recessed portions of a connection object
Implementation Method 2
since the internal terminal and the external terminal are connected to each other via the plated layer with superior conductivity, a connecting portion with low electrical resistance can be formed
Data Source
AI summary
The present disclosure provides a joining technique capable of improving strength and reducing electrical resistance of a connecting portion that performs heterometal interjunction in a sealed battery. A mode of the sealed battery disclosed herein includes an electrode body, a battery case, a positive electrode internal terminal, a positive electrode external terminal, a negative electrode internal terminal, and a negative electrode external terminal. In the sealed battery, in a connecting portion between the negative electrode internal terminal and the negative electrode external terminal, an upper end of the negative electrode internal terminal and the negative electrode external terminal are stacked with a plated layer interposed therebetween and, at the same time, the negative electrode internal terminal and the negative electrode external terminal are joined to each other via the plated layer. In addition, a rough surface having a plurality of recessed portions is formed on the upper surface of the negative electrode external terminal having been stacked with the plated layer interposed therebetween, and a part of the plated layer penetrates into the recessed portions. Accordingly, a connecting portion having high strength and low resistance can be formed between the negative electrode internal terminal and the negative electrode external terminal.