| 摘要 |
PROBLEM TO BE SOLVED: To suppress sufficiently the temperature rise of a battery by projecting plural fins on a peripheral surface of a cylindrical battery can, so that a surface area is expanded, and by effectively dissipating heat generated. SOLUTION: 12 pieces of strip fin 5 made of aluminum are radially arranged on the periphery of a battery can 1 made of aluminum, and are laser welded, so that a battery is made by containing a required positive electrode a negative electrode and an electrolyte in this battery can. It is preferably that expansion rate of the surface area of the periphery of the battery by the projected fins is set for 1.8-10 times the surface area of the periphery of the battery before the fins are projected. Furthermore, if this value is less than 1.8, the surface area is insufficient, and an improvement ratio of thermal radiation characteristic is reduced. In addition, if it exceeds 10 times, spaces between fins each other are narrowed, and thermal radiation performance by natural convection is impeded. |
