Secondary battery
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Solution Overview
Problem
The existing secondary battery connection structure between the terminal and current collector is complex due to the large number of accessories required, leading to a complicated assembly process.
Innovation Solution
A simplified connection structure is implemented by providing a terminal connection part that passes through a plate hole in the cap plate to electrically connect the current collector to the terminal, reducing the number of components and eliminating the need for intermediate connection components like rivets, with the current collector being directly welded to the terminal connection part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate rivet and terminal connection part 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 terminal connection part into a single integrated terminal connection part. This unified component performs both the mechanical fastening function (replacing the rivet) and the electrical connection function (replacing the separate terminal connection part), thereby reducing the number of accessories and simplifying the assembly structure while maintaining reliable electrical connection between the terminal and current collector
2Reliability
If multiple intermediate connection components are used between the current collector and terminal, then the connection is established, but the assembly process becomes complicated and space utilization decreases
Solution Approach 1:
The patent merges multiple intermediate connection components (rivet and terminal connection part) into a single integrated terminal connection part. This reduces the number of assembly steps, simplifies the manufacturing process, and improves space utilization by eliminating the need for multiple discrete components and their associated fastening operations
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 solution reduces the number of components and simplifies the assembly process, enhancing space utilization and improving current flow efficiency by directly connecting the first and second current collectors without intermediate mediums.
Implementation Method 1
the current collector being directly welded to the terminal connection part
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~5A
AI summary
A secondary battery includes an electrode assembly in which a negative electrode tab and a positive electrode tab are disposed at both ends thereof in a longitudinal direction, respectively, a case which accommodates the electrode assembly and of which both ends in a longitudinal direction are opened, a pair of cap plates coupled to both the opened ends of the case, respectively, and a negative electrode terminal and a positive electrode terminal, which are electrically connected to the negative electrode tab and the positive electrode tab and are exposed to the outside of the cap plates, respectively. A current collector is provided on an upper portion of the negative electrode tab or the positive electrode tab, a terminal connection part is provided on the current collector, and the terminal connection part is configured to pass through a plate hole defined in the cap plate so as to be electrically connected to the negative electrode terminal or the positive electrode terminal.