| 摘要 |
PURPOSE:To restrict the discontinuity due to the corrosion of a lug itself, which is exposed at a melted area, and to improve the safety of a maintenance-free lead-acid battery by providing a base material organization layer at a part near the base of a lug exposed under a strap. CONSTITUTION:A base material organization layer is provided at a part near the base of a lug 2, which is exposed under a strap, so as to prevent the corrosion due to the grain boundary of rough crystals generated by the heat at the time of forming the strap. Namely, an organization 8, which is mainly formed of fiber crystal nearly equal to a central position H of the height of a lug exposed at a part separated from the strap, is provided in the cross section of the lug 2 in the thickness direction. Corrosion in the disconnecting direction is restricted by the organization 8 to reduce the disconnection due to the corrosion. Namely, corrosion of the lug 2 of a negative electrode made of lead- calcium group alloy and formed by rolling is restricted to improve the reliability and the safety of a lead-acid battery. |
