Batterie

摘要

To present a battery having a stable internal resistance small in deviation of internal resistance, and capable of suppressing change or elevation of internal resistance due to external impact. The battery of the invention comprises a battery can having a conductivity, serving also as a negative terminal, and including an opening, a spiral electrode group disposed in the battery can, winding a positive plate and a negative plate around a separator, an electrolyte member disposed in the battery can, and a sealing member serving also as a positive terminal, disposed in the opening of the battery can through an electric insulating member. In the inner wall of the battery can contacting with the negative electrode positioned on the outermost circumference of the plate group, plural linear bumps vertical to the bottom of the battery can are formed, and the height of each linear bump of the plural linear bumps ranges from 0.05 mm to 0.25 mm, and the pitch of the linear bumps ranges from 0.5 mm to 10 mm. The negative electrode member comprises a metal core and a negative electrode material covering the surface of the metal core, and linear bumps are formed on the inner surface of the battery can, and the bumps are formed in a state of biting into the surface of the negative electrode material.