Positive collector plate, battery monomer and assembly method thereof

The invention relates to a positive collector plate, a battery cell and an assembly method thereof. The battery monomer assembling method comprises the following steps of: assembling a battery monomer; the battery cell with the positive electrode current collecting disc and the negative electrode current collecting disc welded to the two ends respectively is installed in the shell, and the boss of the positive electrode current collecting disc protrudes out of the mounting hole of the positive electrode top cover; welding a negative electrode shell cover to one end, deviating from the positive electrode top cover, of the shell; applying pressure to the boss until the compression amount of the elastic connecting piece between the negative current collecting disc and the negative shell cover reaches the maximum value; and the boss is welded with the hole wall of the mounting hole. When the single battery manufactured by the single battery assembling method is subjected to a vibration test or in a transportation