| 摘要 |
PROBLEM TO BE SOLVED: To improve an active material holdability and to maintain high discharge characteristics by forming recessed and projecting parts alternately disposed on front and back sides of the substrate of a battery having an electrode plate group wound with an electrode plate and a separator in a cylindrical shape, the plate being formed with an active material layer on front and back sides of the substrate of lead alloy. SOLUTION: In this lead-aid battery, recessed and projecting parts 2 and 3 are formed on the surface of a substrate corresponding to 30-90% of a portion coated with an active material layer and the height of the projecting part or the depth of the recessed part is preferably 10-90% of a thickness of the active material layer. A rolled body of lead-tin alloy is used for the substrate 1 and the recessed and projecting parts 2 and 3 are formed adjacently each other by plastic deformation with press working. The active material layer is deposited on the substrate 1 to be an electrode plate. The electrode plate is opposed through a separator and wound in a vortical shape to form an electrode plate group. This electrode plate group is stored in a battery jar, an electrolyte is injected through an injecting port disposed in a cover and then form-charged to be a battery. A problem such as falling-off or peeling-off of the active material from the substrate 1 is solved and cycle life characteristics are enhanced.
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