| 摘要 |
PROBLEM TO BE SOLVED: To improve a cycle characteristic and a load characteristic by constructing at least the surface of a negative electrode collector and/or the inside face of a negative electrode armor of a substance, mainly consisting of copper and constructing a positive electrode collector and a positive electrode armor of aluminum with aluminum oxide coating formed on the surface. SOLUTION: A positive electrode cap 8 is installed in the upper opening of a negative electrode jar 6 via a packing 7, and a coil spring 9 is arranged inside the positive electrode cap 8. When a internal pressure inside a battery inside is increases abnormally, the coil spring 9 is pressed in the arrow A direction, so that inside gas is discharged to the atmosphere. The surface of a positive electrode collector is covered with aluminum oxide, which is dense, superior in mechanical strength, and stable, so that the positive electrode collector will not melted even of high voltage is applied. Therefore, a nonconformity of the deterioration of electric collection becoming worse together with the progress of a cycle can be avoided. the thickness if aluminum oxide on the surfaces of the positive electrode collector and the negative electrode collector is extremely small, so that an IR drop is small and a load characteristic can be improved. |
