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 . <EOS>