A battery module, comprising a module casing, a top cover, and a plurality of jelly rolls, wherein the module casing comprises a module housing and a plurality of partition parts located in the module housing, one side of the module housing is of an open structure, the partition parts partition an inner cavity of the module housing into a plurality of grooves, and the plurality of jelly rolls are embedded in the plurality of grooves; the top cover covers an opening of the groove to seal the groove; the module housing comprises two first sidewalls and two second sidewalls, the two first sidewalls are disposed opposite to each other in an extension direction of the module housing, and the two second sidewalls are disposed opposite to each other in a direction perpendicular to the extension direction of the module housing; and the partition parts comprise a first partition part and a second partition part that are crosswise disposed, two ends of the first partition part respectively extend to the two first sidewalls, and two ends of the second partition part respectively extend to the two second sidewalls; and characterised in that: a first cooling channel is formed on each of the two first sidewalls and the two second sidewalls, an extension direction of the first cooling channel is the same as an extension direction of a corresponding sidewall, and first cooling channels on the first sidewall and the second sidewall communicate with each other; and a second cooling channel is formed on the second partition part, and two ends of the second cooling channel respectively extend to and communicate with first cooling channels on the two second sidewalls; and the cooling channels are used for circulation of coolant or cold air. the module casing comprises a module housing and a plurality of partition parts located in the module housing, one side of the module housing is of an open structure, the partition parts partition an inner cavity of the module housing into a plurality of grooves, and the plurality of jelly rolls are embedded in the plurality of grooves; the top cover covers an opening of the groove to seal the groove; the module housing comprises two first sidewalls and two second sidewalls, the two first sidewalls are disposed opposite to each other in an extension direction of the module housing, and the two second sidewalls are disposed opposite to each other in a direction perpendicular to the extension direction of the module housing; and the partition parts comprise a first partition part and a second partition part that are crosswise disposed, two ends of the first partition part respectively extend to the two first sidewalls, and two ends of the second partition part respectively extend to the two second sidewalls; and characterised in that: a first cooling channel is formed on each of the two first sidewalls and the two second sidewalls, an extension direction of the first cooling channel is the same as an extension direction of a corresponding sidewall, and first cooling channels on the first sidewall and the second sidewall communicate with each other; and a second cooling channel is formed on the second partition part, and two ends of the second cooling channel respectively extend to and communicate with first cooling channels on the two second sidewalls; and the cooling channels are used for circulation of coolant or cold air. a first cooling channel is formed on each of the two first sidewalls and the two second sidewalls, an extension direction of the first cooling channel is the same as an extension direction of a corresponding sidewall, and first cooling channels on the first sidewall and the second sidewall communicate with each other; and a second cooling channel is formed on the second partition part, and two ends of the second cooling channel respectively extend to and communicate with first cooling channels on the two second sidewalls; and the cooling channels are used for circulation of coolant or cold air.