The utility model relates to a secondary power source, in particular to an insulated safe type battery module. The structural feature of the battery module is that the battery module further comprises an insulating base and an insulating top cover; a plurality of longitudinal side-by-side grooves are formed on the insulating base, wherein the number of the grooves is equal to that of single batteries; the insulating top cover comprises an insulating frame and an insulating cover plate; a plurality of longitudinal side-by-side caulking grooves are distributed on the insulating frame to allow the insulating frame to cover a the single batteries, and the electrodes of the single batteries are exposed upward; and the insulating cover plate covers and is connected with the insulating frame. The battery module has the advantages that the insulating base and the insulating top cover are arranged in the battery module to form an integral structure, the operation and the maintenance are convenient, and the operation is simple; insulating partition boards are arranged between adjacent grooves and caulking grooves, so that the safety is high; and besides, the insulating safety isolation structure leaves intervals between two adjacent cells, so that the heat dissipation of the battery module is facilitated, the temperature differences of single batteries are reduced, the service life of the battery module is prolonged, and the service performance is ensured.