| 摘要 |
PURPOSE:To reduce the manufacturing cost of a lead-acid battery by arranging a separator including polymer material increasing its volume when it absorbs surfuric acid between positive and negative electrodes, thereby dispensing with the application of pressure thereto in inserting electrode group in a battery container and simplifying the manufacturing process. CONSTITUTION:Fiber of such as amino polyvinylchloride having 10-100mum in dia. and 10-30mum in length is formed as nonwoven cloth having 1.0mum in thickness and 7.57g/dm<2> in weight. The thickness of this separator increases 1.5 times larger while the separator increases its volume. When it absorbs surfuric acid in a state that the thickness is fixed at 1mm, pressure of about 20kg/dm<2> occurs. This pressure can be continuously maintained without being influenced by the specific gravity of surfuric solution. It is thus possible to simplify the manufacturing process without necessity for applying pressure in inserting a electrode group in a battery container so as to reduce the cost. |
