Positive plate coating detection method, positive plate, battery and vehicle

The invention discloses a positive plate coating detection method, a positive plate, a battery and a vehicle. The positive plate coating detection method comprises the following steps: collecting a plurality of thicknesses of a positive plate at different positions of an edge area; obtaining the length of the edge region and the thickness of the positive plate at the corresponding position, and establishing a discrete data set between the length of the edge region and the thickness of the positive plate at the corresponding position; the discrete data set is fitted to form a corresponding judgment function, the formula of the judgment function is Y = AX2 + BX + C, A is a non-zero real number, and B and C are both real numbers; and judging whether a missed coating area exists or not according to the concavity and convexity of the judgment function. Thus, the thickness of the edge area is detected, discrete data are fitted into the judgment function, the function curve of the judgment function is consistent wit