| 摘要 |
PROBLEM TO BE SOLVED: To enable to surely perform the gas drainage from a bottom side of the sheath can also in high temperatures through a center hole of a battery main body, and besides, aim at a decrease of number of parts in a sealed type battery. SOLUTION: A battery main body loaded within a sheath can 1 is made as a structure not to have a wick. In other words, in the cylindrical sheath can 1 that is capped by a cap body 5 having a relief valve 8 in one end, a positive electrode 10 in which the cylindrical battery main body 2 that is laminated via a separator 30, and wound by a positive electrode active substance mixture 12 which is coated on a band-shaped positive electrode current collector 11 and by a negative electrode active substance mixture 12 which is coated on a band-shaped negative electrode current collector 21 is housed. In an inner end of positive electrode 10 or negative electrode 20, a region is formed where the positive electrode active substance mixture 12 or negative electrode active substance mixture 22 is not coated on the positive electrode current collection body 11 or negative electrode current collection body 21, and the configuration that a center hole 40 that is penetrated in the axis direction of battery main body 1 of battery main body 1 is formed in the convolutionally wound central part of battery main body 1 by this region, and this cylindrical center hole 40 is made as a gas drainage hole. |
