Rechargeable Battery Current Collecting Welding
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Solution Overview
Problem
Existing rechargeable battery designs face challenges in maintaining durability during the welding process of current collecting members, which can lead to perforation and reduced battery performance.
Innovation Solution
The use of welding protuberances formed by laser welding between the first and second current collecting members, with a filler positioned between them, helps secure the connection and prevent damage from the laser beam, ensuring a robust connection without forming depressions that could compromise the battery's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If laser welding is used to connect current collecting members, then welding strength and connection reliability are improved, but the risk of perforation and damage to the electrode assembly increases
Solution Approach 1:
A filler material is introduced as an intermediary substance between the current collecting members during laser welding. This filler absorbs excess laser energy and prevents direct transmission to the electrode assembly, thereby avoiding perforation while maintaining strong welds. The filler acts as a buffer that mediates between the high-energy laser beam and the sensitive electrode components.
Solution Approach 2:
The filler material is positioned between the current collecting members before the laser welding process begins. This preliminary placement ensures that the protective barrier is already in place to prevent laser-induced damage, allowing the welding to proceed safely without risking perforation of the electrode assembly.
2Reliability
If current collecting members are welded together, then electrical connection reliability is improved, but structural integrity may be compromised due to welding-induced deformations
Solution Approach 1:
The filler material serves as a mediator that prevents laser energy from directly affecting the current collecting members and electrode assembly. By absorbing excess energy, the filler prevents thermal deformations and maintains the structural integrity of the components while still achieving reliable electrical connections through the weld.
3Duration of action of stationary object
If welding is performed on current collecting members, then connection durability is improved, but the complexity of the welding process increases due to need for filler positioning and precision control
Solution Approach 1:
The filler material is pre-positioned between the current collecting members before welding begins. This preliminary action simplifies the overall process by eliminating the need for complex real-time filler delivery systems, while still achieving durable connections through the protected welding process.
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 approach enhances the durability of the rechargeable battery by preventing perforation and maintaining the structural integrity of the electrode assembly during the welding process, thereby improving the battery's overall performance and longevity.
Implementation Method 1
the welding protuberances are formed by laser welding in a state in which filler is positioned at a space between the first current collecting member and the second current collecting member
Data Source
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AI summary
A rechargeable battery including an electrode assembly that is chargeable and dischargeable; electrode terminals electrically connected to the electrode assembly; a case accommodating the electrode assembly therein; and a current collecting part electrically connecting between the electrode assembly and the electrode terminals, wherein the current collecting part includes a current collecting plate electrically connected to the electrode assembly, and a lead member connecting the electrode terminals and the current collecting plate, the current collecting plate includes a first current collecting member connected to the lead member, and a second current collecting member welded to the first current collecting such that welding protuberances are provided on a region where the first current collecting member and the second current collecting member are welded.