Power battery and power device

The utility model relates to the technical field of batteries, and discloses a power battery and a power device. The power battery comprises a top cover (1), a liquid supplementing hole (11) and a sealing element mounting groove (12) communicated with the liquid supplementing hole (11) are formed in the top cover (1), and a rubber sealing element (2) for sealing the liquid supplementing hole (11) is arranged in the sealing element mounting groove (12). After the power battery disclosed by the utility model is used for a period of time, the performance is attenuated, and liquid supplementation is needed, the liquid supplementation hole can be communicated with the interior of the battery shell only by puncturing the rubber sealing element through the liquid injection needle, so that the liquid supplementation is carried out on the power battery, and the liquid supplementation structure is simple in design and high in reliability. Besides, the power battery adopts the rubber sealing element, so that the risk of