PURPOSE: To increase storage life and discharge performance after storage of a flat type battery utilizing organic electrolyte by specifying a volume ratio of power generating elements to the inner volume of an assembled sealing plate made by combining an insulating gasket and a sealing plate.
CONSTITUTION: An assembled sealing plate is fabricated by combining an insulating gasket 2 and a sealing plate 1 with a sealant 3 interposed. When the total volume occupied by power generating elements such as a negative active material 4, a separator 5, a positive active material 6, and electrolyte is limited to 90∼100% of the total inner volume, no leakage immediately after assembling of battery is generated. When the ratio of electrolyte to positive active material is limited to 0.80∼0.85μl/mg, increase in internal resistance during discharge becomes such large as exceeding 30Ω. Therefore, its ratio should be increased to more than 0.85μl/mg.
KARIYA KAZUHIKO
YAGIYUU YASUSABUROU
