Transferable Electrode Tip for Robust Anode Tab Resistance Welding
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Solution Overview
Problem
Existing resistance welding techniques face challenges in creating robust and consistent welds between dissimilar materials like nickel anode current collector tabs and stainless-steel casings, often resulting in sticking issues and damage during the welding process, especially when welding multiple tabs together.
Innovation Solution
The introduction of a high resistance transferable electrode tip between the welding electrode and the anode tabs helps to concentrate heat and create point-welds, ensuring a robust connection by maintaining a resistive balance and preventing copper contamination on the anode tabs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If copper welding electrodes are used for resistance welding nickel anode tabs to stainless-steel casings, then the welding process is simple and effective, but copper softening causes the electrode to stick to the anode tab and copper contamination is left behind
Solution Approach 1:
A transferable electrode tip made of high-resistivity material (such as nickel or stainless steel) is introduced as an intermediary between the copper welding electrode and the nickel anode tab. This tip concentrates the heat at the weld point and prevents copper from directly contacting and contaminating the anode tab, while still enabling effective resistance welding of the dissimilar materials.
2Productivity
If resistance welding is used to join dissimilar materials with different thicknesses (thin anode tabs and thick casings), then the joining process is efficient, but the thin tabs are prone to tearing when the electrode is withdrawn
Solution Approach 1:
The transferable electrode tip creates a localized high-resistance zone at the weld point, concentrating heat generation precisely where needed. This allows the welding energy to be focused on creating a strong bond between the thin tab and thick casing without overheating or weakening the tab material, preventing tab tearing during electrode withdrawal.
3Reliability
If multiple anode tabs are stacked and welded together, then the electrical connection is improved, but the tabs do not weld robustly to each other and pull tests are required to verify connection strength
Solution Approach 1:
The transferable electrode tip acts as a mediator that distributes heat evenly across the stacked tab interfaces, ensuring consistent welding between multiple tabs. The high-resistivity material maintains thermal concentration at each weld point, creating robust bonds between tabs without requiring pull tests for verification.
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 results in consistent and robust welds between the anode tabs and the cell casing, reducing the risk of tab damage and copper contamination, while allowing for reliable connections even when multiple tabs are stacked and welded.
Implementation Method 1
a high resistance transferable electrode tip between the welding electrode and the anode tabs helps to concentrate heat and create point-welds
Data Source
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AI summary
A new weld configuration is used to obtain a robust and consistent resistance weld between the tabs of an anode current collector and the casing of an electrochemical cell. This is done by adding a resistive transferable electrode tip between at least one of the welding electrodes, preferably the movable welding electrode, and the stacked parts that are being joined together. The purpose of the transferable electrode tip is to generate a sufficient amount of heat during the welding process so that the stacked parts are joined together without adding any product functionality. In one embodiment of the present invention, the transferrable electrode tip is a stainless-steel ball, the stacked anode current collector tabs are of nickel, and the cell casing is of stainless-steel.