Battery module

A battery module comprising:

• a battery stack that includes a plurality of batteries stacked;
• a pair of end plates that are disposed at both ends, in a stack direction in which the batteries are stacked, of the battery stack, the pair of end plates including at least one end plate that includes a first portion made of a first metal that has a Young's modulus higher than a Young's modulus of a second metal, and a second portion made of the second metal that has a density lower than a density of the first metal;
• a pair of restraint members disposed on both sides of the battery stack, the pair of restraint members being made of the first metal, wherein the pair of restraint members have eaves portions that protrude from ends of sides of restraint members and are bent inwardly so that the eaves portions sandwich the battery stack and the pair of end plates in the stack direction, wherein
• the first portion includes a first face and a second face,
• the second portion includes a third face and a fourth face,
• the first face faces the battery stack in the stacking direction,
• the second face is opposed to the first face in the stacking direction,
• the third face faces the battery stack in the stacking direction, and
• the fourth face is opposed to the third face in the stacking direction;
• and
• welded portions that connect the second face of the first portion of the at least one end plate with the eaves portions of the pair of the restraint members.