| 摘要 |
PURPOSE: A case for a battery and a secondary battery comprising the same is provided to have different color at location of a case corresponding with a defective location, thereby capable of easily sorting defective products by a detector. CONSTITUTION: A case for a battery comprises: an inner layer of one or more layers, a metal layer formed on the inner layer; and an outer layer of one or more layers formed on the metal layer. The outer layer comprises at least one colored layer. A manufacturing method of a secondary battery(100) comprises: a step of detecting external appearance of the battery case; a step of detecting defects by color difference; and a step of treating defective cases. |
