Pouch Cell Tab Plating via Plasma Cleaning and Vacuum Sputtering
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Solution Overview
Problem
Conventional manufacturing methods for negative and positive tabs of pouch cells result in uneven plating thickness, poor corrosion resistance, weak adhesion, and environmental pollution due to chemical plating, leading to reduced product stability and increased waste management issues.
Innovation Solution
The method involves surface cleaning and roughening of copper and aluminum foils using plasma-decomposed high reactivity particles, followed by vacuum sputtering to apply passivated metal films, enhancing adhesion and corrosion resistance while reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If plating or chemical plating is used to manufacture negative and positive tabs, then the tabs can be formed with protective films, but the plated film has uneven thickness and poor adhesion when the substrate is not completely cleaned
Solution Approach 1:
The patent applies plasma treatment to the substrate surface before plating to pre-clean and activate the surface. This preliminary action ensures complete removal of organic contaminants and oxidation of the metal surface, creating an optimal surface state for subsequent plating that guarantees both uniform film thickness and strong adhesion, eliminating the need for manual cleaning steps.
Solution Approach 2:
The patent replaces manual or mechanical cleaning methods with plasma cleaning. The plasma process uses reactive species to chemically clean and activate the substrate surface, providing more consistent and complete cleaning than mechanical methods, which directly improves both film uniformity and adhesion by ensuring a pristine surface before plating.
2Reliability
If plating or chemical plating is used to manufacture negative and positive tabs, then the tabs can be formed with protective films, but the plated profile has weakened crystallinity resulting in holes and caved portions on the surface
Solution Approach 1:
The patent modifies the plating process parameters by conducting plating in a vacuum environment with controlled gas atmosphere (argon or nitrogen). This parameter change prevents oxidation during plating, maintains proper crystallinity development, and ensures smooth, hole-free surfaces while preserving the protective and corrosion-resistant properties of the plated film.
Solution Approach 2:
The patent uses an inert atmosphere (vacuum with argon or nitrogen) during the plating process to prevent oxidation and contamination of the plated film. This inert environment allows the metal to plate with proper crystalline structure and smooth surface morphology, eliminating holes and caved portions while maintaining excellent corrosion resistance.
3Ease of manufacture
If plating or chemical plating is used to manufacture negative and positive tabs, then the tabs can be formed with protective films, but the process creates waste water including oil, particles, suspended matters, chromate, cyanide and heavy metals
Solution Approach 1:
The patent extracts and eliminates the harmful wet chemical plating process from the manufacturing system, replacing it with vacuum plasma deposition. This removal of the chemical plating step completely eliminates the generation of contaminated waste water containing chromate, cyanide, heavy metals, and other pollutants, while maintaining the ability to produce protective tabs.
Solution Approach 2:
The patent replaces wet chemical plating with vacuum plasma deposition, substituting a chemical process that generates polluted waste water with a physical vapor deposition process. This substitution eliminates the need for chemical baths and waste water treatment while achieving the same protective function on the tabs.
4Device complexity
If the surface of the passivated film is not roughened, then the manufacturing process is simpler, but the adhesion between the passivated film and the glue layer is weak causing detachment
Solution Approach 1:
The patent applies plasma treatment to roughen the passivated film surface before glue application. This preliminary surface modification creates micro-roughness that mechanically interlocks with the adhesive, dramatically improving bond strength. The plasma process achieves this surface preparation in a single step without adding complex mechanical roughening equipment.
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
The method improves the corrosion resistance and adhesion of tabs, extending the pouch cell's lifespan and reducing leakage risks, while also minimizing environmental pollution through more controlled and efficient manufacturing processes.
Implementation Method 1
cleaning and surface roughening a copper foil substrate in which a gaseous fluid is decomposed into high reactivity particles including ion, electronic and free radicals by using plasma
Implementation Method 2
plating onto the roughened surface of the copper foil substrate by vacuum sputtering
Implementation Method 3
cleaning and surface roughening the nickel film with a gaseous fluid decomposed into high reactivity particles including ion, electronic and free radical by using plasma
Implementation Method 4
plating a passivated metal film onto the nickel film by vacuum sputtering
Implementation Method 5
cleaning and surface roughening the passivated metal film with a gaseous fluid decomposed into high reactivity particles including ion, electronic and free radical by using plasma
Data Source
AI summary
A method for manufacturing a negative tab of a pouch cell includes following step of cleaning and surface roughening a copper foil substrate, plating a nickel film, cleaning and surface roughening the nickel film, plating a passivated metal film and cleaning and surface roughening the passivated metal film. A method for manufacturing a positive tab of a pouch cell includes following step of cleaning and surface roughening an aluminum foil substrate, plating a passivated metal film and cleaning and surface roughening the passivated metal film.