Abstract: A negative-pressure packaging method for aluminum electrolytic capacitors including: penetratedly arranging a capacitor element in a seal; placing the capacitor element, the seal and a case at an inner chamber of an accommodating mechanism; sealing the accommodating mechanism; vacuumizing the accommodating mechanism to allow the inner chamber to be in a negative pressure state; subjecting the seal and the case to packaging, such that the seal is located at a first depth of the case; and subjecting the seal and the case to pressing, such that the seal is located at a second depth of the case, where the second depth is closer to a bottom of the case with respect to the first depth.

Abstract: A seat plate assembly for fixing a capacitor on a circuit board, including a base plate, a first guard plate, a second guard plate, a third guard plate, a fourth guard plate, a first reinforcing rib and a second reinforcing rib. The first guard plate, the second guard plate, the third guard plate and the fourth guard plate are provided spaced apart on an upper end surface of the base plate in sequence. The first reinforcing rib is configured to connect the first guard plate with the second guard plate. The second reinforcing rib is configured to connect the third guard plate with the fourth guard plate.