Battery Terminal Rivet Joint for Stronger Current Collector Bonding
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Solution Overview
Problem
Secondary batteries face challenges in achieving high bonding strength between terminals and current collector plates, which affects their stability and performance, especially in high-capacity applications like electric vehicles.
Innovation Solution
The use of a blind rivet to create a pressing force between the terminal and the current collector plate, combined with welding, enhances the bonding strength by ensuring a secure electrical and mechanical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is performed directly between terminal and current collector plate, then electrical connection is achieved, but bonding strength is insufficient
Solution Approach 1:
A blind rivet is inserted into the terminal and current collector plate before welding to pre-establish mechanical pressure contact between the components. This preliminary mechanical fixation ensures proper alignment and sufficient contact pressure during the subsequent welding process, thereby improving bonding strength and connection reliability.
2Ease of manufacture
If mechanical fastening alone is used to connect terminal and current collector plate, then assembly is simple, but electrical connection quality is insufficient
Solution Approach 1:
The patent combines two fastening methods: mechanical fastening by the blind rivet and thermal bonding by welding. The blind rivet provides initial mechanical pressure contact and alignment, while welding creates a strong metallurgical bond. This combination maintains assembly simplicity while significantly improving electrical connection quality and reliability.
3Reliability
If high bonding strength is achieved through multiple fastening methods, then connection reliability improves, but manufacturing complexity increases
Solution Approach 1:
The blind rivet serves as an intermediary component between the terminal and current collector plate. It facilitates the welding process by ensuring proper alignment and contact pressure, and simultaneously provides mechanical fastening. This intermediary element achieves high connection reliability without requiring multiple separate fastening components or complex assembly procedures.
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 approach improves the weldability and bonding strength between the terminal and current collector plate, reducing the risk of electrolyte leakage and enhancing the overall stability and performance of the secondary battery.
Implementation Method 1
utilizing a blind rivet to form a pressing force between the terminal and the current collector plate
Implementation Method 2
combining a terminal and a current collector plate by utilizing a blind rivet to form a pressing force between the terminal and the current collector plate and then welding
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5b
AI summary
A secondary battery (100) includes: an electrode assembly (110) having a first electrode tab and a second electrode tab exposed on opposite sides, respectively; a first current collection part (120) electrically coupled to the first electrode tab; a case (160) accommodating the electrode assembly (110) and the first current collection part (120); a first cap plate (171) sealing an opening (161, 162) of the case (160); a first terminal (130) mechanically and electrically coupled to the first current collection part (120) and exposed to the outside of the first cap plate (171); and a blind rivet (175) coupling the first terminal and the first current collection part (120).