Secondary Battery Terminal Connection Member Dissimilar Metal Bonding
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Solution Overview
Problem
The quality of welding between dissimilar metal terminals and bus bars in secondary batteries is lower than that of similar metals, leading to reduced bond strength and potential deterioration in secondary battery modules.
Innovation Solution
The use of terminal connection members formed from the same material as the bus bars, with screw threads and locking mechanisms to enhance the bonding between terminal plates and bus bars, ensuring improved electrical coupling and stability in secondary battery modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dissimilar metal materials are used for terminals and bus bars, then electrical conductivity and cost are improved, but welding bond strength deteriorates
Solution Approach 1:
A terminal connection member is introduced as an intermediary component between the terminal plate and the bus bar. This connection member includes a first terminal connection portion that couples with the terminal plate and a second terminal connection portion that couples with the bus bar, enabling reliable electrical connection while accommodating dissimilar metal materials through a standardized intermediate interface
Solution Approach 2:
The terminal assembly is segmented into distinct components: the terminal plate, the terminal connection member, and the bus bar. This segmentation allows each component to be optimized independently for its specific function, with the terminal connection member serving as a specialized interface component that handles the complexity of dissimilar metal joining
Data Source
AI summary
A secondary battery includes an electrode assembly, a battery case, and a cap assembly. The electrode assembly may include a first electrode plate, a second electrode plate, and a separator. The battery case may accommodate the electrode assembly, which may be inserted into the battery case through an opening provided on one side of the battery case. The cap assembly may include a cap plate coupled to the side of the battery case including the opening and sealing up the battery case, and first and second terminals spaced on the cap plate. The first and second terminals may each include first and second terminal plates including protrusions that protrude away from the electrode assembly, and first and second terminal connection members on the first and second terminal plates and including grooves that can be combined with the corresponding protrusions.