Plated Steel Plate for Cell Can with Dual Surface Finish
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Solution Overview
Problem
The existing plated steel plates for cell cans, with dull finished surfaces to reduce contact resistance, are prone to damage and plating separation during the drawing press process, leading to exposure of underlying iron and increased gas evolution within batteries.
Innovation Solution
A plated steel plate with one surface dull finished and the other bright finished, where the dull finished surface has an average roughness of 0.6 μm or more and the bright finished surface has an average roughness of 0.4 μm or less, and the plating on the dull surface is done without sulfur compounds, ensuring a nickel-iron diffusion layer is absent and the bright surface has a plating thickness of 1.5 μm or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surface of the plated steel plate is made dull finished to reduce contact resistance, then stable electrical contact is improved, but damage and plating separation occur during drawing press
Solution Approach 1:
The invention applies different surface finishes to different surfaces of the same plated steel plate. The outer surface is made dull finished with average roughness Ra≥0.6μm to ensure stable electrical contact, while the inner surface is kept bright finished with Ra≤0.4μm to prevent damage and plating separation during drawing press processing.
2Reliability
If mechanical processing such as rolling is performed to create dull finished surface, then contact resistance is reduced, but the plated surface becomes weak and more likely to be damaged
Solution Approach 1:
The invention replaces mechanical surface treatment methods (such as rolling) with electrochemical plating control to achieve the desired surface roughness. By controlling plating conditions and using appropriate plating solutions, the dull finished surface is created without subjecting the plated layer to additional mechanical stress that would weaken it.
3Reliability
If one surface is plated with different finishes, then electrical contact and damage resistance are both improved, but electroplating process becomes difficult to implement
Solution Approach 1:
The invention segments the plating process into two separate steps: first plating one surface with a dull finished appearance and then plating the other surface with a bright finished appearance. This segmentation makes it feasible to achieve different surface qualities on each side of the steel plate using standard electroplating equipment and techniques.
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 provides stable electrical contact on the outer surface while minimizing damage and gas evolution within the battery, maintaining a leak-proof property and reducing contact resistance.
Implementation Method 1
the process that plates a steel plate with a metal mainly based on nickel is performed by the electroplating in such a manner as the steel plate being a substrate is immersed in a plating bath
Data Source
AI summary
The plated steel plate for a cell can provides stable and good electrical contact on an outer surface of the cell can, and the evolution of gas within a battery can be suppressed by reducing damage to a plated surface of the steel plate when the cell can is formed by drawing press. In this manner, it is possible to provide a battery and an alkaline dry battery that can realize stable electrical contact with devices and reduce the evolution of gas. In a plated steel plate for a cell can both of whose surfaces are plated mainly with nickel, one surface of a steel plate that is a plated substrate is a dull finished surface, and another surface thereof is a bright finished surface.