| 摘要 |
PURPOSE:To increase the strength of a negative pole can and secure a button- type battery excellent in leakproofness, by installing more than three spots of waves or folds in portions except the bottom part and peripheral part of the negative pole can having a turnout. CONSTITUTION:More than three spots of waves or folds are installed in portions except a bottom part 1a and a peripheral part 1b of a negative pole can having a turnout part 1. For example, each of waves or folds 2 is formed in a rising part 3a, a bending part 3 and an upper part 3b of the negative pole can. With this constitution, when convertional plate thickness ones are used, such a negative pole can as being yet stronger in strength is securable, and even when those materials being thinner than the conventional plate thickness ones are used, strength of more than that of using conventional thickness plates can be secured. Therefore, when the said negative pole can is used for a button-type battery, improvements in leakproofness is thus securable as well as when a thin material is used, an increase in the battery capacity can be secured instead. |
