PURPOSE: To eliminate internal shortcircuit at the winding end of a positive electrode plate and simplify work processes by applying nonconductive thermoplastic resin to an exposed metal support at the end.
CONSTITUTION: Around a porous support 2 of metal gauze, punched metal, lath metal, etc., are spirally wound a lengthwise positive electrode plate carrying positive electrode active material 1 mainly including manganese dioxide, graphite fluoride, iron sulfide, etc., and a lengthwise negative electrode plate consisting of light metal such as lithium and sodium through a separator, they are contained in a battery container with electrolyte of supporting electrolyte such as lithium perchlorate dissolved in nonaqueous solvent, and the container is sealed. Then positive electrode active material at the winding end of the positive electrode plate is eliminated to expose the metal support 2, where nonconductive thermoplastic resin 3 is applied to the exposed metal support. The surface of burrs and the end of the metal support 2 thus become nonconductive, so if the end penetrates through the separator to get in contact with the negative electrode plate or the battery container acting as the negative electrode terminal, an accident of internal shortcircuit can be prevented.
FUJITA KOJI
MUSHIAKI NAOFUMI
OCHIWA KENICHI
