Secondary Battery Current Collector Plate Coupling Protrusion
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Solution Overview
Problem
Secondary batteries face challenges in maintaining improved welding quality while ensuring the rigidity and heat tolerance of current collector plates, which is crucial for efficient energy storage and device performance.
Innovation Solution
The design incorporates a current collector plate with a coupling protrusion and a rivet groove, allowing the electrode terminal to be electrically connected through welding, ensuring secure coupling without damaging insulating components, and maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode terminal is welded to the current collector plate, then electrical connection is achieved, but the insulating components may be damaged by the welding beam
Solution Approach 1:
The current collector plate is segmented into a welding portion and a non-welding portion by the coupling protrusion. The welding portion is positioned below the insulating components, allowing the welding beam to be directed only at the metal portion, thereby achieving electrical connection without damaging the insulating components.
Solution Approach 2:
The coupling protrusion acts as an intermediary structure that positions the welding portion of the current collector plate below the insulating components. This intermediary structure enables the welding beam to reach the welding portion without passing through or damaging the insulating components.
2Reliability
If the current collector plate structure is modified to improve welding quality, then welding quality improves, but the rigidity and heat tolerating performance may deteriorate
Solution Approach 1:
The coupling protrusion creates a local structural feature that concentrates the welding operation to a specific area (the welding portion). This local modification improves welding quality by providing a dedicated welding surface while the rest of the current collector plate maintains its original rigidity and heat tolerating performance.
Solution Approach 2:
The coupling protrusion extends in the vertical dimension, creating a three-dimensional structure that positions the welding portion below the insulating components. This dimensional change allows improved welding access and quality without compromising the overall structural integrity of the current collector plate.
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 enhances welding quality, maintains rigidity and heat tolerance, and prevents damage to insulating components, thereby improving the overall performance and reliability of secondary batteries.
Implementation Method 1
A welding beam, used for the welding, may be irradiated upwardly from a lower surface of the coupling protrusion
Data Source
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AI summary
A secondary battery includes: a case having an accommodating space therein; an electrode assembly accommodated in the case and having an uncoated portion on one end thereof; a current collector plate electrically connected to the uncoated portion of the electrode assembly; a cap plate sealing the case; and an electrode terminal outside the cap plate and electrically connected to the current collector plate. The current collector plate has a terminal hole through which the electrode terminal passes and the current collector plate includes a coupling protrusion protruding toward the electrode assembly along a periphery of the terminal hole.