Laser Welding Electrode Tab Cable Battery Insulating Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for welding electrode tabs in rechargeable batteries face quality deterioration due to contamination from the electrode active material and insulating layers, leading to reduced flexibility and durability, especially when used in cable-type batteries.
Innovation Solution
A method involving an electrode stack with an insulating layer, a current collecting layer, and a primer layer, where the electrode active material layer is formed with a region exposed, allowing the electrode tab to be laminated and welded using a pulsed laser beam that penetrates through the insulating layer, minimizing damage and maintaining flexibility and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the insulating layer and primer layer are completely removed before welding, then welding quality is improved, but flexibility and durability of the electrode deteriorate
Solution Approach 1:
The insulating layer is designed with high transmittance (50% or more) at the laser wavelength before welding, allowing the laser beam to pass through and heat the current collecting layer without requiring removal of the insulating layer. This preliminary design of layer transmittance enables welding through the insulating layer, avoiding the need to remove it and thus preserving electrode flexibility and durability while achieving good welding quality
Solution Approach 2:
The invention changes the optical parameters of the insulating layer by selecting materials with high transmittance at specific laser wavelengths (400-1200 nm). This parameter change allows the insulating layer to be transparent to the laser beam, enabling welding through the layer without removal, thus resolving the contradiction between welding quality and electrode durability
2Manufacturing precision
If the insulating layer is removed to prevent contamination, then welding quality is improved, but the manufacturing process complexity increases
Solution Approach 1:
The insulating layer is pre-designed with high laser transmittance properties before the welding process. This preliminary design allows the welding to be performed directly through the insulating layer without any removal steps, simplifying the manufacturing process while ensuring welding quality by preventing contamination from layer removal
Solution Approach 2:
The invention extracts the harmful effect of contamination by making the insulating layer transparent to the laser beam. Instead of removing the layer to prevent contamination, the layer is designed to allow laser penetration, thus extracting the problematic interaction between the laser and insulating layer while maintaining the layer's protective function
3Speed
If a conventional laser beam is used for welding, then welding speed is improved, but damage to the insulating layer increases
Solution Approach 1:
The invention changes the wavelength parameter of the laser beam to match the high transmittance range of the insulating layer (400-1200 nm). This parameter change allows the laser to pass through the insulating layer with minimal absorption and damage, enabling fast welding speeds while maintaining insulating layer integrity
Solution Approach 2:
The invention uses a pulsed laser beam instead of a continuous laser beam. This periodic action allows the laser energy to be delivered in controlled pulses, preventing excessive heat accumulation and damage to the insulating layer while maintaining efficient welding speed through optimized pulse timing and duration
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 simplifies the welding process, improves weld quality, and ensures the flexibility and durability of the electrode, making it suitable for cable-type rechargeable batteries by minimizing damage to the insulating layer and maintaining optimal performance.
Implementation Method 1
welding the electrode tab and the current collecting layer by irradiating a pulsed laser beam, in which transmittance of the insulating layer is 50% or more at a wavelength of 400 nm to 1,200 nm, and the pulsed laser beam penetrates through the insulating layer and is emitted in a direction from the insulating layer to the current collecting layer
Data Source
AI summary
The present invention relates to a method of welding an electrode tab which welds an electrode tab and a current collecting layer by using a pulsed laser beam, and a cable type rechargeable battery including an electrode manufactured according to the same.