NOVELTY - The mechanism has an electrode bolt (102) connected with a current conductor (114) through a fixed thread. A fixed bolt head thread section is matched with a fixing groove (103) through a fixing bolt (105). A sensing point locks a battery management unit of an electrode and the fixed bolt head thread section. The fixing bolt is inserted into the fixing groove and fixed with a sensing unit. A unit adopts calculation procedure for comparing consistency of a signal generated from a sensing contact (104) and locking state of the electrode bolt.    USE - Mechanism for confirming a locked state of an electrode bolt on a battery pack in an electric vehicle i.e. electric motor car.    ADVANTAGE - The mechanism is mounted with a voltage sensor for monitoring consistency of the signal, so that a vehicle control unit can recognize potential of the electrode bolt, and utilizes a battery management unit to detect voltage information and locked state of the electrode bolt of a corresponding battery pack so as to distinguish the electrode bolt with potential risk and provide an identifier of the electrode bolt to perform check in an effective manner. The mechanism allows personnel to quickly identify a group join contact fault part so as to prolong working time. The mechanism improves working reliability of a group in an electric vehicle, and can detect bolt-shaped state of a lock with high feasibility and high reliability for maintaining reliability of a power source, avoiding utilization of an additional wire or group and battery modules and reducing assembling labor cost. The mechanism reduces production cost as a locking device utilizes a sensor for determining device locking state, and can simplify working procedure or realize disassembling and combination operation of the battery management unit. The mechanism can satisfy requirements for examination and a user or personnel to receive a coding signal of the battery module in a stable manner for preventing generation of electric arc damage or vehicle accidental stop of electric power in a system as a vehicle early warning state signal is received from a unit.    DETAILED DESCRIPTION - The sensing contact and a contact surface coating of the fixing bolt are made of insulation material.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a mechanism for confirming a locked state of an electrode bolt on a battery pack in an electric vehicle.    Electrode bolt (102)    Fixing groove (103)    Sensing contact (104)    Fixing bolt (105)    Current conductor (114)