Liquid cooling assembly, liquid cooling system, battery and electric device

The utility model relates to a liquid cooling assembly, a liquid cooling system, a battery and a power utilization device, and the liquid cooling assembly comprises a cooling part which is internally provided with a cooling flow channel; the water inlet pipeline is communicated with the cooling flow channel; the water outlet pipeline is communicated with the cooling flow channel; the cooling piece is provided with a bearing face, and in the direction intersecting with the bearing face, the height, protruding out of the bearing face, of the water inlet pipeline is larger than the height, protruding out of the bearing face, of the water outlet pipeline. The height, protruding out of the bearing face, of the water inlet pipeline is larger than the height, protruding out of the bearing face, of the water outlet pipeline, and a large height difference is generated when a cooling medium flows into the cooling flow channel, so that the cooling medium can more smoothly flow into the cooling flow channel under the action of the gravity of the cooling medium; the pressure drop of the cooling medium at the water inlet end and the water outlet end of the cooling flow channel is effectively reduced, and the pressure loss is reduced, so that the cooling efficiency of the cooling medium in the cooling flow channel can be improved, and the cooling effect is improved.