| 摘要 |
PURPOSE:To eliminate any possible deformation due to contraction in time of injection molding and improve the efficiency of leakproofness, by forming a plastic sealing body by way of installing a ring padding in a coupling part between a cylindrical part surrounding a negative current colletor and a ring film part. CONSTITUTION:A positive pole 2, a separator 4 and a negative pole 3 are all housed in a positive pole can 1, and the opening of the positive pole can 1 is sealed up with a sealing body 5 composed of polyethylene or the like, thus a cylindrical battery is made up. At this time, the sealing body 5 is made up of the opening part of a cylindrical part 5b and the can 1 surrounding a negative current collector 7, a ring thin part 5c coupling section L-shaped parts 5a, 5b with 5b nippingly held by a negative bottom plate 6 and a ring padding part 5d installed in a coupling part between 5b and 5c. Therefore, any possible deformation due to contraction in time of molding the sealing body 5 by injection and cooling the melted resin inside a metal mold can be prevented and likewise a leakage of liquid from a fitting part between the sealing body 5 and the negative current collector 7 can be effectively prevented. |
