In order to improve the corrosion resistance of the metal shell of the battery pack,carbon nanotubes and graphene powder were doped into the polyimide coating to obtain a polyimide composite coating,and the changes of corrosion resistance,conductivity and toughness before and after adding na-no-carbon materials at 200℃were also studied.The results showed that the corrosion resistance,elec-trical conductivity and mechanical properties of the polyimide were improved after doping carbon nano-tubes,especially the electrical conductivity was greatly improved,and the performance of polyimide was most significantly improved by doping 1%CNTs and 0.5%graphene at the same time,which indi-cated that adding one-dimensional and two-dimensional nano-materials to polyimide at the same time could better improve the performance of the coating.
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