| 摘要 |
PURPOSE:To enable a cell to correspond to any discharge of strong load or light one, by clamping a sealing plate housing a negative electrode active material and a positive electrode case, having an air supply port in a bottom part where a positive electrode and a separator are housed, together with an insulated sealing ring interposed in between, and installing a layer, regulating an air quantity, in the bottom face outside of the positive electrode case. CONSTITUTION:On the circumference of an air supply hole 8 serving as an admission passage of air and steam between a case inner part and the outside, there are provided with a secondary air regulating film 10 consisting of hermetical seal paper 9, applying a bonding agent to polyethylene to keep off evaporation of steam before application, and a porous fluorocarbon resin film and an air regulating layer 11 using porous fluorocarbon resin. Therefore, in case of light load, the air regulating layer at the case outside bottom, where an oxygen supply per unit time comes to a rate-determining step, works, while in case of strong load, the regulating layer at the case outside bottom is removed whereby air regulation can be done by the regulating film 10 inside the cell, therefore evaporation of water content in a battery electrolyte at the light load discharge is also regulable. |
