A power battery, the power battery includes an inner case (4), an outer case (1), a battery body (2) and electrodes (3), the battery body (2) includes electrode plates, the external surface of the outer case is provided with an external heat abstractor and the internal surface of the inner case is provided with an internal heat abstractor, a cylindrical holding cavity (5) with an annular cross section is formed between the outer case (1) and the inner case (4) and the electrode plates are rolled in the holding cavity (5), the electrodes (3) are arranged in an inner cavity of the inner case (4) and the inner case also has at least an airway going through the inner cavity.