Secondary Battery Terminal Assembly With Direct Current Collector Coupling
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Solution Overview
Problem
The existing secondary battery assembly structure requires a large number of accessories for electrical connection, leading to a complex assembly process due to the use of separate rivets and multiple components for connecting the current collector to the terminal.
Innovation Solution
A simplified structure is implemented by directly welding the first and second current collectors together without an intermediate terminal connection part, reducing the number of components and using a terminal connection part that passes through a cap plate hole to connect the current collector to the terminal, thereby eliminating the need for a hollow rivet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate rivet and multiple components are used to electrically connect the terminal to the current collector, then the electrical connection is achieved, but the number of accessories increases and the assembly structure becomes complicated
Solution Approach 1:
The patent combines the rivet and the terminal connection part into a single integrated component. The terminal connection part is formed as one piece that directly connects the terminal to the current collector, eliminating the need for a separate rivet and reducing the number of accessories while maintaining reliable electrical connection.
Solution Approach 2:
The terminal connection part serves multiple functions simultaneously: it provides mechanical connection between the terminal and current collector, ensures electrical conductivity, and replaces the functions previously performed by both the rivet and the terminal connection part. This multi-functional design simplifies the assembly structure while achieving the same electrical connection reliability.
2Reliability
If a hollow-type rivet and gasket are used to connect the terminal to the current collector, then the electrical connection is established, but the number of components increases
Solution Approach 1:
The patent merges the rivet, gasket, and terminal connection functionality into a single integrated terminal connection part. This one-piece structure eliminates the need for separate hollow-type rivets and gaskets, reducing the component count from three separate parts to one unified component while maintaining the same electrical connection reliability.
Solution Approach 2:
The invention extracts and eliminates unnecessary intermediate components (the hollow-type rivet and separate gasket) from the assembly. By directly forming the terminal connection part to connect the terminal to the current collector, the patent removes redundant components while preserving the essential electrical connection function.
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 reduces the complexity and number of components in the assembly, simplifying the electrical connection between the terminal and current collector, and enhances the current flow efficiency by direct coupling of the first and second current collectors.
Implementation Method 1
a first current collector welded to the negative electrode tab or the positive electrode tab of the electrode assembly
Implementation Method 2
the terminal connection part passes through a plate hole in the cap plate to be electrically connected to the negative electrode terminal or the positive electrode terminal
Data Source
AI summary
A secondary battery including: an electrode assembly including a negative electrode tab and a positive electrode tab at opposite ends thereof in a longitudinal direction; a case accommodating the electrode assembly, both ends of the case in the longitudinal direction being open; a pair of cap plates respectively coupled to the open ends of the case; and a negative electrode terminal and a positive electrode terminal respectively electrically connected to the negative electrode tab and the positive electrode tab and exposed at an outside of the cap plates, respectively. A current collector is on an upper portion of the negative electrode tab or the positive electrode tab, a terminal connection part is on the current collector, and the terminal connection part passes through a plate hole in the cap plate to be electrically connected to the negative electrode terminal or the positive electrode terminal.