A cartridge includes a cartridge housing having a liquid storage cavity, and a sealing member for sealing the liquid storage cavity, and a first electrode and a second electrode mounted on the sealing member. A first blind hole and a second blind hole are respectively disposed on the end face of the sealing member away from the liquid storage cavity. The liquid injection needle pierces the sealing member through the wall of at least one of the first blind hole and the second blind hole and communicates with the liquid storage cavity to inject liquid into the liquid storage cavity. After the liquid injection is completed, the liquid injection needle is pulled out, and the sealing member is self-sealed at the pierced position. The first blind hole is blocked by the first electrode while the second blind hole is blocked by the second electrode.