Sealed Battery Terminal Joint With Plated Anchor Layer
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Solution Overview
Problem
Existing 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 heterometal interjunction is used to join internal terminal and external terminal, then the joining process can be completed, but the junction strength and electrical resistance are insufficient
Solution Approach 1:
Rough surfaces are formed on the joining surfaces of the internal terminal and external terminal before the joining process. This preliminary action creates recessed portions that enable the plated layer to penetrate and anchor, thereby improving both junction strength and electrical resistance of the connecting portion.
Solution Approach 2:
A plated layer is introduced as an intermediary substance between the internal terminal and external terminal. The plated layer penetrates into the recessed portions of the rough surfaces and provides excellent electrical conductivity while strengthening the bond between the dissimilar metal members.
2Strength
If smooth surfaces are used for joining, then the manufacturing process is simple, but the junction strength is insufficient for heterometal connections
Solution Approach 1:
Rough surfaces with recessed portions are created on the joining surfaces before assembly. This preliminary surface preparation enables the plated layer to mechanically anchor during the joining process, significantly improving junction strength for heterometal connections between internal and external terminals.
3Reliability
If conventional joining methods are used, then the process is straightforward, but the connecting portion has high electrical resistance
Solution Approach 1:
Rough surfaces are prepared in advance on the joining surfaces of terminals. This preliminary action creates anchor points for the plated layer, ensuring low electrical resistance in the connecting portion without requiring complex real-time adjustments during assembly.
Solution Approach 2:
A plated layer is used as an intermediary material between the internal terminal and external terminal. This plated layer fills the recessed portions of rough surfaces and provides excellent electrical conductivity, reducing electrical resistance in the heterometal connection.
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
Implementation Method 2
the internal terminal and the external terminal are joined to each other via the plated layer
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.