| 摘要 |
PURPOSE:To raise the resistance to liquid leakage by using a hardened product consisting of a given epi-bis type epoxy resin and a hardener, e.g., a heterocyclic diamine, as a sealant for sealing portion. CONSTITUTION:The surface of contact between the peripheral edge portion of the negative electrode can 5 and the packing 6 is coated with the sealant layer 7 in advance. The sealant layer 7 is composed of a hardened product consisting of an epi-bis type epoxy resin of an average molecular weight of 450 or more and a hardener heterocyclic diamine. The use of the sealant which is capable of closely adhering to the metal of negative electrode can, etc., and packing material greatly increases the resistance to liquid leakage. |
