A battery module, characterized by comprising: a housing with an inner cavity; a plurality of unit batteries stacked in the inner cavity, wherein a stacking direction of the unit batteries is a length direction of the battery module; an end plate, located at an end of the battery module along the length direction, the end plate includes a matching wall made of a metal materia, an inner plate and an outer plate distributed along the length direction of the battery module, and the both are connected therebetween by the matching wall; an output pole base mounted above the end plate in a height direction and is made of a plastic material, the output pole base comprising a mounting part and a matching part which are fixedly connected, wherein the mounting part is configured to mount the matching part on the output pole base, the matching part is made of metal material and is fixedly connected to the end plate to limit a freedom degree of movement of the output pole base relative to the end plate along the height direction, a width direction and the length direction, wherein the width direction is an extending direction of the end plate; the mounting part is provided with a mounting groove, the matching part is located in the mounting groove, side walls of the mounting groove have a clamping groove, a bottom wall of the mounting groove has a first limiting portion, and the clamping groove and the first limiting portion are distributed along the height direction; along the height direction, an end of the matching part is clamped in the clamping groove, and the other end abuts against the first limiting portion; the end plate has first matching cavities that are located on both sides of the matching wall along the width direction; the inner plate 14, the outer plate 15 and the matching wall 11 enclose the first matching cavities 12; and the side walls of the mounting groove are located in the first matching cavities and match with the first matching cavities. a housing with an inner cavity; a plurality of unit batteries stacked in the inner cavity, wherein a stacking direction of the unit batteries is a length direction of the battery module; an end plate, located at an end of the battery module along the length direction, the end plate includes a matching wall made of a metal materia, an inner plate and an outer plate distributed along the length direction of the battery module, and the both are connected therebetween by the matching wall; an output pole base mounted above the end plate in a height direction and is made of a plastic material, the output pole base comprising a mounting part and a matching part which are fixedly connected, wherein the mounting part is configured to mount the matching part on the output pole base, the matching part is made of metal material and is fixedly connected to the end plate to limit a freedom degree of movement of the output pole base relative to the end plate along the height direction, a width direction and the length direction, wherein the width direction is an extending direction of the end plate; the mounting part is provided with a mounting groove, the matching part is located in the mounting groove, side walls of the mounting groove have a clamping groove, a bottom wall of the mounting groove has a first limiting portion, and the clamping groove and the first limiting portion are distributed along the height direction; along the height direction, an end of the matching part is clamped in the clamping groove, and the other end abuts against the first limiting portion; the end plate has first matching cavities that are located on both sides of the matching wall along the width direction; the inner plate 14, the outer plate 15 and the matching wall 11 enclose the first matching cavities 12; and the side walls of the mounting groove are located in the first matching cavities and match with the first matching cavities.