Iron-Nickel Alloy Plating for Battery Containers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The surface of iron-nickel alloy plating layers in existing battery containers has many amorphous portions where iron is easily eluted, leading to shortened battery life due to gas-generated breakage and liquid leakage.
Innovation Solution
A surface-treated steel sheet with an iron-nickel alloy layer that undergoes thermal treatment to achieve an average crystal grain size of 1 to 8 μm, suppressing iron elution and enhancing battery characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If iron-nickel alloy plating is performed on a steel sheet, then the corrosion resistance and basic performance of the battery container are improved, but the surface forms many amorphous portions where iron is easily eluted, leading to shortened battery life
Solution Approach 1:
The invention changes the physical parameter of the plating layer by controlling the average crystal grain size to be 1 to 8 μm through thermal treatment. This parameter change transforms the amorphous portions into crystalline structures, thereby reducing iron elution while maintaining corrosion resistance and extending battery life.
Solution Approach 2:
The invention creates a composite structure by forming an iron-nickel alloy plating layer with specific crystal grain characteristics on the steel sheet substrate. The controlled crystal grain size creates a composite microstructure that combines the corrosion resistance of the alloy plating with the structural stability of crystalline formations, preventing iron elution.
2Reliability
If iron is eluted from amorphous portions in the electrolyte, then the battery container structure deteriorates, but this causes gas generation and liquid leakage that break the container
Solution Approach 1:
The invention applies preliminary anti-action by performing thermal treatment to control crystal grain size before the battery is put into service. This pre-treatment prevents the formation of amorphous portions that would otherwise lead to iron elution, gas generation, and container failure during battery operation.
Solution Approach 2:
By changing the physical parameter of the plating layer (average crystal grain size to 1-8 μm), the invention alters the chemical stability of the surface, preventing iron elution in the electrolyte and thereby eliminating the harmful effects of gas generation and liquid leakage.
3Duration of action of stationary object
If the surface of the iron-nickel alloy plating layer is made more resistant to iron elution, then battery life is extended, but the manufacturing process becomes more complex
Solution Approach 1:
The invention achieves extended battery life by controlling a single key parameter (average crystal grain size of 1-8 μm) through thermal treatment. This parameter control provides a straightforward manufacturing approach that extends battery life without significantly increasing process complexity.
Solution Approach 2:
The thermal treatment to control crystal grain size is performed as a preliminary step during the manufacturing process, before the battery is assembled and put into service. This preliminary action ensures the plating layer has the desired properties from the start, avoiding the need for additional complex post-processing steps.
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 solution effectively extends battery life by preventing iron elution and improving discharge characteristics, while maintaining suitable hardness and liquid leakage resistance.
Implementation Method 1
after iron-nickel alloy plating is performed on a steel sheet, a thermal treatment is performed
Implementation Method 2
an iron-nickel alloy layer, and the iron-nickel alloy layer has an average crystal size of 1 to 8 μm at the outermost surface
Data Source
AI summary
Provided is a surface-treated steel sheet for battery containers (100) that is obtained in such a manner that after iron-nickel alloy plating is performed on a steel sheet (10), a thermal treatment is performed and is characterized in that an outermost layer is an iron-nickel alloy layer (20), and the iron-nickel alloy layer (20) has an average crystal size of 1 to 8 μm at the outermost surface thereof. The present invention makes it possible to provide the surface-treated steel sheet for battery containers that can suppress the elution of iron inside the battery when being used for a battery container, whereby the service life of the battery can be extended and battery characteristics such as discharge characteristics is improved, and to provide a battery container and a battery that can be obtained using the surface-treated steel sheet for battery containers.