Liquid cooling device and power battery

The utility model is suitable for the technical field of batteries, and provides a liquid cooling device and a power battery, the liquid cooling device comprises a liquid cooling plate, a cooling channel is arranged in the liquid cooling plate, a liquid inlet and a liquid outlet are formed in the side face of the liquid cooling plate, a mounting groove is formed in the front face of the liquid cooling plate, and the two ends of the cooling channel communicate with the liquid inlet and the liquid outlet correspondingly; the mounting grooves are used for arranging heat-conducting fins and battery cells. According to the embodiment of the invention, the contact area between the battery cell and the bottom surface of the mounting groove can be increased, so that the heat dissipation efficiency of the battery cell is improved, and the situation that the heat dissipation efficiency of the battery cell is reduced due to local suspension of the battery cell caused by displacement of the heat-conducting fin is avoided