A battery module heat management assembly, wherein the battery module heat management assembly comprises: a cooling mechanism comprising: a plurality of multi-channel pipe groups arranged side by side, each multi-channel pipe group has at least one multi-channel pipe, the number of the multi-channel pipe groups is equal to the number of rows of battery modules, each multi-channel pipe group corresponds to one row of the rows of battery modules, each of the rows of battery modules has at least one battery module, each multi-channel pipe group contacts a bottom of one corresponding row of the rows of battery modules from below; a first fluid collector and a second fluid collector communicated with an external cooling fluid circuit and respectively provided at two ends of the plurality of multi-channel pipe groups, two ends of each multi-channel pipe of the plurality of multi-channel pipe groups are respectively communicated with the first fluid collector and the second fluid collector, so that the external cooling fluid circuit, the plurality of multi-channel pipe groups, the first fluid collector and the second fluid collector are communicated to cool all the rows of battery modules; characterized in that the battery module heat management assembly further comprise: heating films, each heating film is provided below one corresponding multi-channel pipe group for heating the one corresponding multi-channel pipe group; heat insulating layers, each heat insulating layer is provided below one corresponding heating film; and a plurality of supporting structures, each supporting structure is provided below one corresponding heat insulating layer. a cooling mechanism comprising: a plurality of multi-channel pipe groups arranged side by side, each multi-channel pipe group has at least one multi-channel pipe, the number of the multi-channel pipe groups is equal to the number of rows of battery modules, each multi-channel pipe group corresponds to one row of the rows of battery modules, each of the rows of battery modules has at least one battery module, each multi-channel pipe group contacts a bottom of one corresponding row of the rows of battery modules from below; a first fluid collector and a second fluid collector communicated with an external cooling fluid circuit and respectively provided at two ends of the plurality of multi-channel pipe groups, two ends of each multi-channel pipe of the plurality of multi-channel pipe groups are respectively communicated with the first fluid collector and the second fluid collector, so that the external cooling fluid circuit, the plurality of multi-channel pipe groups, the first fluid collector and the second fluid collector are communicated to cool all the rows of battery modules; a plurality of multi-channel pipe groups arranged side by side, each multi-channel pipe group has at least one multi-channel pipe, the number of the multi-channel pipe groups is equal to the number of rows of battery modules, each multi-channel pipe group corresponds to one row of the rows of battery modules, each of the rows of battery modules has at least one battery module, each multi-channel pipe group contacts a bottom of one corresponding row of the rows of battery modules from below; a first fluid collector and a second fluid collector communicated with an external cooling fluid circuit and respectively provided at two ends of the plurality of multi-channel pipe groups, two ends of each multi-channel pipe of the plurality of multi-channel pipe groups are respectively communicated with the first fluid collector and the second fluid collector, so that the external cooling fluid circuit, the plurality of multi-channel pipe groups, the first fluid collector and the second fluid collector are communicated to cool all the rows of battery modules; characterized in that the battery module heat management assembly further comprise: heating films, each heating film is provided below one corresponding multi-channel pipe group for heating the one corresponding multi-channel pipe group; heat insulating layers, each heat insulating layer is provided below one corresponding heating film; and a plurality of supporting structures, each supporting structure is provided below one corresponding heat insulating layer. heating films, each heating film is provided below one corresponding multi-channel pipe group for heating the one corresponding multi-channel pipe group; heat insulating layers, each heat insulating layer is provided below one corresponding heating film; and a plurality of supporting structures, each supporting structure is provided below one corresponding heat insulating layer.