Patent ID: 9166210
Filing Date: 2015-10-20
Classification: C25D,H01M,Y02E

Abstract:
1. A case for a secondary battery, the case comprising: a body configured to accommodate an electrode assembly and composed of a conductive material; an oxide film on the body, the oxide film being on two oppositely facing-away surfaces of the body; and a colored sealing layer on the oxide film, the colored sealing layer comprising a dye to provide the color of the colored sealing layer, wherein the colored sealing layer is on two oppositely facing-away surfaces of the body, wherein the colored sealing layer is composed of organic materials having a plurality of colors to provide the colored sealing layer with the plurality of colors or a plurality of patterns, wherein: wherein the electrochemical treatment in the adipic acid solution is performed in which: wherein the aluminum plate is mechanically hardened by thickening the aluminum oxide film with an electrochemical treatment in a boric acid solution wherein the electrochemical treatment in the boric acid solution is performed in which: wherein the oxide film is configured to increase mechanical Vickers hardness of the case, and the colored sealing layer is configured to fill pores of the oxide film, wherein the Vickers hardness of the case is configured to be from about 350 Hv to about 450 Hv.