| abstract |
A secondary battery capable of absorbing pressure due to volume expansion following the expansion of a power generation element accompanying charging and discharging of the secondary battery. In a secondary battery 10 in which a separator 102 containing an electrolytic solution is laminated between a positive electrode and a negative electrode, Of the positive electrode plate 101 and the negative electrode plate 103, the electrode layers 101b, c, 103b, c of one electrode plate are formed at a lower density than the electrode layers 101b, c, 103b, c of the other electrode plates. Yes. [Selection] Figure 2 |