Patent ID: 7163762

Claim:
A polymer electrolyte battery comprising: a wound battery element having a cathode comprising an elongated cathode collector having two sides on which cathode active material layers are formed, an anode comprising an elongated anode collector having two sides on which anode active material layers are formed, and a polymer electrolyte formed between said cathode and said anode and extending between opposite longitudinal sides and opposite rounded lateral sides; wherein a section of the longitudinal sides of the battery element perpendicular to the wound axis has a substantially curved form between said opposite rounded lateral sides and the curves of each longitudinal side are parallel to each other; wherein the battery element is substantially enclosed by a laminate film; wherein the laminate film has a substantially curved form wherein a portion of the curved form is generally flat; and wherein the laminate film comprises an aluminum foil sandwiched between a pair of polyolefine resin films.