Preparation method of liquid cooling plate, liquid cooling plate and power battery

The invention relates to the technical field of power batteries, and provides a preparation method of a liquid cooling plate, the liquid cooling plate and a power battery. The preparation method of the liquid cooling plate comprises the following steps: laying the composite material layer and the auxiliary material layer on a mold; wherein the composite material layer comprises an infiltrating medium and a plurality of layers of fiber prepreg, and the infiltrating medium is arranged in each layer of fiber prepreg; the composite material layer and the auxiliary material layer are heated, so that the first part area of the composite material layer is filled with the concave runner part of the mold, and the second plate structure with a liquid runner is formed; wherein the first partial area is a part, corresponding to the position of the concave runner part, in the composite material layer. According to the invention, the normal installation operation of the battery cell module above the liquid cooling plate ca