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Pre-nickel plated battery steel strip is the main material for manufacturing battery casings, which plays an important role in the safety and energy storage performance of batteries. Pre-plated nickel steel strip not only needs to meet the requirements of stamping and manufacturing battery shells, but also needs to meet the requirements of corrosion resistance. Therefore, this article focuses on studying the changes in coating structure of battery shell steel strip at different annealing temperatures and its influence on corrosion resistance. The nickel plated steel strip produced on the production line was used to compare the surface and cross-sectional structures of the original samples and the samples subjected to annealing processes at 500 °C, 600 °C, and 700 °C and held for 10 min. The surface and cross-sectional structures of the samples were observed by electron microscopy, and changes in composition were observed by EDS testing. The diffusion of Ni and Fe in the sample coating was observed by glow testing, and the thickness of the nickel iron intermediate layer was observed by electron probe testing of the cross-section of the samples. At the same time, surface hardness and bending adhesion were tested. Salt spray tests were conducted to observe the corrosion resistance of the alloyed samples. After the appearance of red rust on the surface of the salt spray samples, surface and cross-sectional electron microscopy observations were carried out to determine the morphology and composition of the corrosion products. XRD testing was also performed to determine the type of corrosion products. The results showed that there was a significant change in the surface morphology after high-temperature heating, with recrystallization and coarse and dense grain size observed at high temperatures; EDS analysis of the cross-section revealed the diffusion of Ni and Fe elements; As the alloying temperature increases, the Ni-Fe diffusion layer thickens; After heat treatment, the hardness also decreased and the coating became softer, resulting in the flow of surface material during bending; During the experiment of heating at 700 °C and conducting a 300H salt spray test, no red rust appeared, which is speculated to be due to the increased thickness of the Ni-Fe diffusion layer improving the corrosion resistance of the coating.

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Influence of Annealing Parameters on the Properties of Nickel Plated Steel Plates for New Energy Battery Cases

  • 会议论文

  • 发表日期：

    2026年

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  • Guanghui Liu,
  • Zaiwang Liu,
  • Haiquan Wang,
  • Huaxiang Teng

摘要

Pre-nickel plated battery steel strip is the main material for manufacturing battery casings, which plays an important role in the safety and energy storage performance of batteries. Pre-plated nickel steel strip not only needs to meet the requirements of stamping and manufacturing battery shells, but also needs to meet the requirements of corrosion resistance. Therefore, this article focuses on studying the changes in coating structure of battery shell steel strip at different annealing temperatures and its influence on corrosion resistance. The nickel plated steel strip produced on the production line was used to compare the surface and cross-sectional structures of the original samples and the samples subjected to annealing processes at 500 °C, 600 °C, and 700 °C and held for 10 min. The surface and cross-sectional structures of the samples were observed by electron microscopy, and changes in composition were observed by EDS testing. The diffusion of Ni and Fe in the sample coating was observed by glow testing, and the thickness of the nickel iron intermediate layer was observed by electron probe testing of the cross-section of the samples. At the same time, surface hardness and bending adhesion were tested. Salt spray tests were conducted to observe the corrosion resistance of the alloyed samples. After the appearance of red rust on the surface of the salt spray samples, surface and cross-sectional electron microscopy observations were carried out to determine the morphology and composition of the corrosion products. XRD testing was also performed to determine the type of corrosion products. The results showed that there was a significant change in the surface morphology after high-temperature heating, with recrystallization and coarse and dense grain size observed at high temperatures; EDS analysis of the cross-section revealed the diffusion of Ni and Fe elements; As the alloying temperature increases, the Ni-Fe diffusion layer thickens; After heat treatment, the hardness also decreased and the coating became softer, resulting in the flow of surface material during bending; During the experiment of heating at 700 °C and conducting a 300H salt spray test, no red rust appeared, which is speculated to be due to the increased thickness of the Ni-Fe diffusion layer improving the corrosion resistance of the coating.