The metal foil of the positive electrode 1a or the negative electrode 1b
in the power generating element 1 is connected along the connecting plate
portion 2b which is folded, twisted, and provided in a protruding
condition from the main portion 2a of the current-collector connector 2;
hence the shape of the current-collector connector 2 becomes easy to
form, and a battery capable of enhancing current collection efficiency,
reliability and workability can be provided.