ELECTRODE PLATE, STACKED ELECTRODE ASSEMBLY, AND BATTERIES

A current collecting terminal is commonly used at two active material retaining portions that retain an active material to prevent variations of current collecting efficiency, and further, reduce the number of current collecting terminals, thus not only simplifying a welding work but also facilitating work for layering a plurality of electrode plates. Specifically, a layered electrode group 3 according to the present invention includes a positive electrode plate 31, a negative electrode plate 32, and a separator 33. The positive electrode plate 31 is formed into a substantial U-shape by disposing two active material retaining portions 31B retaining the positive active material opposite to each other. The negative electrode plate 32 is formed into a substantial U-shape by disposing two active material retaining portions 32B retaining the negative active material opposite to each other. The positive electrode plate 31 and the negative electrode plate 32 are layered such that at least one active material retaining portion 31B at the positive electrode plate 31 is sandwiched between two active material retaining portions 32B at the negative electrode plate 32.