Prismatic battery

A prismatic battery comprising:

• an electrode assembly which includes a positive electrode including a belt-like positive electrode core member and a positive electrode active material layer formed on both surfaces of the positive electrode core member, a negative electrode including a belt-like negative core member and a negative electrode active material layer formed on both surfaces of the negative electrode core member, and a belt-like separator interposed between the positive electrode and the negative electrode;
• and a battery case accommodating the electrode assembly, wherein
• the electrode assembly is formed by winding the positive electrode, the negative electrode, and the separator in the longitudinal directions thereof, and has a flat portion in which the positive electrode, the negative electrode, and the separator are laid flat, and folded portions in each of which the positive electrode, the negative electrode, and the separator are curved and folded, the folded portions being adjacent to the flat portion;
• the negative electrode has, in an end portion thereof from which winding is started, a one-sided active material layer portion in which the negative electrode active material layer is provided only on one surface of the negative core member;
• and
• the one-sided active material layer portion terminates at a first predetermined position between a position at which the negative electrode is folded for the second time and a position at which the negative electrode is folded for the third time.