Surgical instrument and battery pack thereof

A surgical instrument, comprising:

• a handle assembly, having a protruding portion;
• and
• a battery pack, detachably assembled on the handle assembly, and operatively coupled to the protruding portion, and having at least one battery unit;
• wherein, the battery pack comprises at least one discharging system comprising:
• a discharge element, and
• a switching member, operable to electrically connect the discharge element to the battery unit of the battery pack to form a discharge circuit;
• wherein,
• the switching member has an initial open state, in which the discharge circuit is non-conductive;
• an intermediate open state, in which the switching member cooperates with the protruding portion to make the discharge circuit non-conductive, and a closed state, in which the switching member is released from the protruding portion to make the discharge circuit conducting;
• wherein the discharging system further comprises a discharging circuit board, on which the discharge element is arranged, and the switching member is configured to be at least one conductive movable member with at least part operably movable, and
• one end of the movable member is fixed on the discharging circuit board and electrically connected to the discharge element, and the other end thereof is operably connected to the discharge element electrically.