The present disclosure relates to a connecting adapter configured to connect to a terminal assembly. The connecting terminal assembly includes a plurality of electrical connecting terminals. The connecting adapter includes a printed circuit board that includes a comb-type conducting structure. The comb-type conducting structure includes a plurality of comb teeth, and each comb tooth includes an electrical contact surface. The connecting adapter also includes an electrical plug connector interface including a plug connector. The electrical plug connector interface includes electrical terminals electrically connected to the electrical contact surfaces of the comb teeth. The electrical plug connector interface is arranged on the printed circuit board.