| 摘要 |
PURPOSE: To instantaneously stop flow of high current caused by internal short circuit to reduce damage of a battery and influence to circumference. CONSTITUTION: Positive electrodes 2 and negative electrodes 3 are alternately stacked through a separator 8, current collectors 5, 7 of the positive electrodes 2 and the negative electrodes 3 are extended as lead wires 5a, 7a, then connected to a positive terminal 11 and a negative terminal 12. In this lithium ion secondary battery, the lead wires 5a, 7a of the current collectors 5, 7 are formed as a fuse, and the cross section of the fuse is specified to: electrical resistivity of current collectors 5, 7 (μΩ.mm) × area of positive electrode 2 (mm<2> )×4.27×10<-7> < cross section of the fuse (mm<2> ) < resistivity of current collectors 5, 7 (μω.mm) × area of positive electrode (mm<2> )×2.41×10<-6> . |
