| 摘要 |
PROBLEM TO BE SOLVED: To provide a flat nonaqueous electrolyte secondary battery attempting reduction of defects in manufacturing batteries due to loose electrodes and improved battery performance. SOLUTION: The flat nonaqueous electrolyte secondary battery comprises a sealed structure having a negative electrode metal case and a positive electrode metal case which are caulked through an insulating gasket. The structure contains a group of electrodes made by wounding a positive electrode, a negative electrode and a separator, and a nonaqueous electrolyte. A positive electrode component and a negative electrode component, having conductivity respectively to one or the other of the outer surfaces of the electrodes in the direction parallel to the flat surface of the flat battery, are exposed and connected either to the positive electrode case or a battery case. The leading end parts of the outer periphery of the positive electrode and the negative electrode in the group of electrodes formed by wounding sheet electrode units, a separator positioned at the inner surface thereof, and the other electrode positioned at the inner surface of the separator are respectively individually stopped winding at both of the two side R parts of the group of electrodes. This structure prevents the electrodes from loosening and shifting, improves the battery performance and can prevent a short circuit between the group of electrodes and the battery case. |
