Battery Cell Current Collector With Elastic Contact to Avoid Weld Debris
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Solution Overview
Problem
The risk of short circuits in battery cells due to residual metal particles generated during the welding of current collector members to electrode components is a significant concern.
Innovation Solution
A battery cell design featuring a current collector member with a base portion and an elastic portion that abuts against the electrode component, allowing for deformation under pressure, reducing the need for welding and minimizing residual metal particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to connect the current collector member to the electrode component, then electrical connection is achieved, but metal particles are generated causing short circuit risk
Solution Approach 1:
The patent replaces the welding process with a mechanical pressing connection. The current collector member is pressed against the electrode component through the sealing plate, establishing electrical contact without thermal processing. This eliminates metal particle generation while maintaining electrical connectivity.
Solution Approach 2:
The patent changes the connection method from thermal (welding) to mechanical (pressing). By adjusting the pressing force and contact pressure parameters, reliable electrical connection is achieved without the harmful effects of welding, thereby reducing short circuit risk.
2Reliability
If the current collector member is pressed against the electrode component, then electrical contact is improved, but excessive pressure may crush the electrode component
Solution Approach 1:
The patent incorporates a cushioning structure in the form of a buffer layer or compliant element between the current collector member and the electrode component. This cushioning element absorbs excess pressing force, ensuring adequate contact pressure for low resistance while preventing crushing of the electrode component.
Solution Approach 2:
The patent uses a flexible sealing plate or membrane as the current collector member, which can deform under pressure to conform to the electrode component surface. This flexibility allows maintaining optimal contact pressure without transmitting excessive force that could crush the electrode, thereby reducing contact resistance while preserving structural integrity.
3Strength
If a rigid current collector member is used, then structural strength is maintained, but contact resistance increases under pressure
Solution Approach 1:
The patent employs a flexible current collector member made from elastomeric or polymer-based materials that can deform under compression. This flexibility allows the current collector to maintain intimate contact with the electrode component surface under pressure, reducing contact resistance while the material's inherent tensile strength maintains structural integrity.
Solution Approach 2:
The patent uses composite materials combining conductive fillers (such as carbon black, graphite, or metal particles) within a polymer matrix. This composite structure provides both the flexibility needed for low contact resistance and the structural strength required for mechanical support, resolving the contradiction between rigidity and contact quality.
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 design reduces the risk of short circuits by eliminating the need for welding, ensuring stable contact resistance and improving overcurrent capacity while maintaining effective current transmission.
Implementation Method 1
the elastic portion being configured to be able to deform when squeezed by the electrode component... The elastic portion produces an elastic force after compression deformation, and under the action of the elastic force, the elastic portion is kept in contact with the electrode component
Data Source
AI summary
A battery cell, a manufacturing method, a manufacturing system, a battery and an electrical device are provided. In some embodiments, the battery cell of includes an electrode component; a casing for accommodating the electrode component and having an opening; an end cap for sealing the opening of the casing; a current collector member for electrically connecting the electrode component and the end cap, the current collector member including a base portion and an elastic portion connected to the base portion. The elastic portion abuts against the electrode component, so the elastic portion is not required to be welded to the electrode component, thus reducing metal particles to lower the risk of short circuit. The elastic portion is able to deform when squeezed by the electrode component and release the pressure therebetween by deformation, reducing the risk of crushing the electrode component due to excessive pressure.