Cylindrical Battery Cell End Cap Recess for Protected Laser Welding
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Solution Overview
Problem
The existing cylindrical battery cell manufacturing process is complicated and inefficient due to the crimp-sealing method, which leads to a high failure rate in welding between the end cap and the current collecting component, affecting the service life of the battery cell.
Innovation Solution
The cylindrical battery cell design includes a recessed portion on the end cap that is welded to the current collecting component, and a cover plate that covers the recessed portion to reduce oxidation and corrosion, eliminating the need for crimp-sealing and enhancing the stability of the welding connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If penetration laser welding is used to weld the end cap with the current collecting component, then the assembly efficiency is improved, but the welding mark is exposed on the outer surface causing oxidation and corrosion
Solution Approach 1:
The end cap is designed with a recessed portion that creates a localized protected zone. The welding between the end cap and current collecting component occurs within this recessed area, which is then covered by a cover plate. This local structural modification allows the welding mark to be hidden and protected from oxidation and corrosion, while maintaining the efficiency of penetration laser welding.
Solution Approach 2:
A cover plate is introduced as an intermediary element that covers the recessed portion of the end cap containing the welding mark. This cover plate acts as a protective barrier between the welding mark and the external environment, preventing oxidation and corrosion while allowing the welding process to proceed efficiently.
2Reliability
If crimp-sealing method is used to seal the negative electrode terminal, then the sealing is achieved, but the manufacturing process becomes complicated and assembly efficiency is low
Solution Approach 1:
The complex crimp-sealing process is replaced by extracting the sealing function into a simpler welding operation. The end cap is directly welded to the housing and to the current collecting component within the recessed portion, eliminating the need for separate crimp-sealing steps and reducing manufacturing complexity while maintaining sealing reliability.
Solution Approach 2:
The mechanical crimp-sealing process is replaced with laser welding technology. Instead of using mechanical force to crimp and seal the negative electrode terminal, the invention uses laser welding to create strong, reliable connections between the end cap, housing, and current collecting component, thereby simplifying the manufacturing process and improving assembly efficiency.
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 configuration reduces the risk of connection failure between the end cap and the current collecting component, improves the adhesion of the contact surfaces, and extends the service life of the cylindrical battery cell by minimizing oxidation and corrosion.
Implementation Method 1
The end cap is disposed on one side adjacent to the opening, and is welded with the side wall to seal the opening
Implementation Method 2
The current collecting component is disposed on one side of the electrode assembly facing the opening, and the current collecting component is welded with the first tab
Implementation Method 3
In the thickness direction of the end cap, the end cap includes a cover body and a recessed portion that is recessed toward the electrode assembly, and the recessed portion is welded with the current collecting component
Implementation Method 4
a cover plate that covers the recessed portion to reduce oxidation and corrosion
Data Source
AI summary
A cylindrical battery cell includes: a housing, an electrode assembly, a current collecting component, an end cap and a cover plate. The housing includes an end wall and a side wall surrounding the end wall. An opening is formed on one side of the side wall facing away from the end wall. A first tab is disposed on one side of the electrode assembly facing the opening. The current collecting component is welded with the first tab. The end cap is disposed on one side adjacent to the opening, and is welded with the side wall to seal the opening. In the thickness direction of the end cap, the end cap includes a recessed portion that is recessed toward the electrode assembly, and the recessed portion is welded with the current collecting component. The cover plate is disposed above the recessed portion to cover the recessed portion.