Assembling apparatus and assembling method suitable for assembling square lithium battery pole group

The invention discloses an assembling apparatus and an assembling method suitable for assembling a square lithium battery pole group. The assembling apparatus comprises a cover plate, an insulating locking frame and a protection film; the electric core is fixed through a reasonable assembly of integrating the three parts of the cover plate, the insulating locking frame and the protection film into one body, and the phenomena of short circuit between the positive electrode and the negative electrode, short circuit between the positive electrode and the shell, and short circuit between the negative electrode and the shell in the internal can be prevented; the protection film body is made from a PE material used for protecting the surface of the pole group on one hand, and for isolating the pole group from the shell on the other hand so as to prevent the shell from being electrified to realize the insulating effect; small holes are formed in the two sides of the upper part of the protection film; the insulating locking frame penetrates from the holes to connect the insulating locking frame and the protection film into one body; the insulating locking frame comprises a left part and a right part, and insulating locking frame is connected with the protection film in one body; the left part and the right part are connected by adopting a clamping groove extruding and inserting mode, so that the assembling process is simplified; a fixed slot is formed in the lower part of the cover plate; and the insulating locking frame penetrates through the slot, so that the assembly of integrating the three parts of the cover plate, the insulating locking frame and the protection film into one body is realized.