Battery module, comprising: a plurality of batteries arranged in a length direction, wherein each of the plurality of batteries comprises a top cover, and along a width direction, a first electrode terminal, a second electrode terminal and an explosion-proof valve are disposed on the top cover; and a first heat exchange plate located on one side of the plurality of batteries in the width direction, and bending to the plurality of batteries along the width direction, the first heat exchange plate comprising: a first main body portion and a first bending portion; wherein the first main body portion is located on one side of the plurality of batteries in the width direction; and the first bending portion bends from an upper side of the first main body portion to the plurality of batteries along the width direction and covers explosion-proof valves of at least one of the plurality of batteries in the width direction, a flow channel for flow of a heat exchange medium is disposed in the first bending portion, and the first bending portion is configured to leak the heat exchange medium in the flow channel after the first bending portion is melted by a high temperature and high pressure gas when the high temperature and high pressure gas generated inside the batteries breaks through the explosion-proof valve; and wherein the first heat exchange plate comprises: a first outer plate and a first inner plate; wherein the first outer plate is provided with first bulging ribs, and the first bulging ribs protrude toward the flow channel; and the first inner plate is connected to side faces of the plurality of batteries in the width direction, and connected to the first outer plate, and the first inner plate, the first bulging ribs of the first outer plate and the first outer plate together form flow channels for flow of a heat exchange medium in the first main body portion and the first bending portion that are communicated. a plurality of batteries arranged in a length direction, wherein each of the plurality of batteries comprises a top cover, and along a width direction, a first electrode terminal, a second electrode terminal and an explosion-proof valve are disposed on the top cover; and a first heat exchange plate located on one side of the plurality of batteries in the width direction, and bending to the plurality of batteries along the width direction, the first heat exchange plate comprising: a first main body portion and a first bending portion; wherein the first main body portion is located on one side of the plurality of batteries in the width direction; and the first bending portion bends from an upper side of the first main body portion to the plurality of batteries along the width direction and covers explosion-proof valves of at least one of the plurality of batteries in the width direction, a flow channel for flow of a heat exchange medium is disposed in the first bending portion, and the first bending portion is configured to leak the heat exchange medium in the flow channel after the first bending portion is melted by a high temperature and high pressure gas when the high temperature and high pressure gas generated inside the batteries breaks through the explosion-proof valve; and wherein the first heat exchange plate comprises: a first outer plate and a first inner plate; wherein the first outer plate is provided with first bulging ribs, and the first bulging ribs protrude toward the flow channel; and the first inner plate is connected to side faces of the plurality of batteries in the width direction, and connected to the first outer plate, and the first inner plate, the first bulging ribs of the first outer plate and the first outer plate together form flow channels for flow of a heat exchange medium in the first main body portion and the first bending portion that are communicated. a first outer plate and a first inner plate; wherein the first outer plate is provided with first bulging ribs, and the first bulging ribs protrude toward the flow channel; and the first inner plate is connected to side faces of the plurality of batteries in the width direction, and connected to the first outer plate, and the first inner plate, the first bulging ribs of the first outer plate and the first outer plate together form flow channels for flow of a heat exchange medium in the first main body portion and the first bending portion that are communicated.