Patent ID: 7803483

Claim:
A nonaqueous electrolyte battery, comprising: a case formed of a film and including a heat sealed section formed on an edge portion of the case; a nonaqueous electrolyte provided in the case; a positive electrode provided in the case and containing a positive electrode current collector formed of an aluminum foil or an aluminum alloy foil; a negative electrode provided in the case and containing a negative electrode active material having a lithium ion insertion potential not lower than 0.4 V (vs. Li/Li + ), and the negative electrode containing a negative electrode current collector formed of an aluminum foil or an aluminum alloy foil; a positive electrode terminal including a tip portion withdrawn to an outside of the case via the heat sealed section of the case, and a seal portion being positioned in the heat sealed section, and the positive electrode terminal being made of aluminum or aluminum alloy and electrically connected to the positive electrode; a first alumina layer having projections and recesses and formed on the seal portion of the positive electrode terminal; a negative electrode terminal including a tip portion withdrawn to the outside of the case via the heat sealed section of the case, and a seal portion being positioned in the heat sealed section, and the negative electrode terminal being made of aluminum or aluminum alloy and electrically connected to the negative electrode; and a second alumina layer having projections and recesses and formed on the seal portion of the negative electrode terminal, wherein the positive electrode terminal and the negative electrode terminal have a cross sectional area S (mm 2 ) which satisfies the formula (1) given below: 0.6Q≦S≦2Q (1) where Q denotes a rated capacity (Ah) of the nonaqueous electrolyte battery, which falls within a range of 1 to 50 Ah.