Excrement collecting box and fullness detection method thereof

A fullness detection method for an excrement collecting box, wherein the excrement collecting box comprises a housing, a sealing assembly, a collecting bag. and a detection unit, and the method comprises:

• driving the sealing assembly to close;
• after a preset time, detecting, by the detection unit, whether the sealing assembly is in a closed position;
• in response to a detection result that the sealing assembly is in the closed position, determining, by the detection unit, that the excrement collecting box is not fully collected and stopping driving the sealing assembly to move;
• and
• in response to a detection result that the sealing assembly is not in the closed position, determining, by the detection unit, that the excrement collecting box is fully collected and backward driving the sealing assembly to return to an opened state,
• wherein the sealing assembly comprises a left side sealing portion and a right side sealing portion, at least one of the left side sealing portion or the right side sealing portion is slidable relative to the housing, and the left side sealing portion is configured to close with the right side sealing portion,
• wherein the collecting bag is connected to the housing and capable of being abutted against by the sealing assembly, and
• wherein the detection unit is rotatably disposed on the at least one of the left side sealing portion or the right side sealing portion and configured to, in response to the collecting bag being fully collected, abut against the pet excrement to prevent the detection unit from rotating towards a bottom wall of the collecting bag.