| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium secondary battery having excellent reliability with the drop of the cyclic characteristic suppressed, capable of flattening the resistance distribution in its internal electrode body by locating optimally the collection part to take out the current from a positive electrode plate and a negative electrode plate and capable of stable large current discharging by inducing uniform battery reactions in the internal electrode body. SOLUTION: Besides a non-aqueous electrolytic solution, a lithium secondary battery includes an internal electrode body formed by winding a positive electrode plate 2 and a negative electrode plate 3 on a bobbin with a separator interposed. The current collection part 7 of the positive electrode plate 2 is formed in the range ±30% in longitudinal direction (along the X-axis) of the plate 2 from the center position XA between adjoining current collection parts 8A and 8B formed in the negative electrode plate 3 using as reference the length L between XA and the parts 8A and 8B in the condition that the internal electrode body is spread and the two electrode plates 2 and 3 are overlapped. It may also be accepted that the current collection part 8 of the negative electrode plate 3 is located by reference to the center position between adjoining collection parts 7 of the positive electrode plate 2. |
