A battery module, characterized in comprising: a box having an inner cavity; at least two battery unit array structures, each of the at least two battery unit array structures comprising a plurality of battery units arranged along a length direction; and at least two support components configured to provide support for the plurality of battery units, each of the at least two support components being fixed to a side of one of the at least two battery unit array structures in a height direction, wherein the at least two battery unit array structures are arranged along a width direction and correspond to the at least two support components in one-to-one correspondence, the at least two battery unit array structures and the at least two support components are disposed in the inner cavity, the box comprises an upper box and a lower box disposed below the upper box along the height direction, the box comprises at least two recessed portions disposed at the lower box of the box along the width direction, and the box has two opposite ends along the width direction, each of the at least two support components is disposed into a corresponding one of the at least two recessed portions, each of the at least two support components has a flat plate structure, and is located between a corresponding one of the at least two battery unit array structures and a bottom wall of a corresponding one of the at least two recessed portions along the height direction, and a first rib is formed between the two recessed portions, a second rib is form between one of the two recessed portions and a corresponding one of the two opposite ends, and the first rib and the second rib both protrude from the bottom wall towards the upper box, and a dimension of each of the at least one support component in the width direction is smaller than a dimension of each of the plurality of battery units in the width direction, each of the plurality of battery units of one of the at least two battery unit array structures has two ends in the width direction protruding beyond one of the at least one support component along the width direction, and the two ends abut against the first rib and the second rib along the height direction. a box having an inner cavity; at least two battery unit array structures, each of the at least two battery unit array structures comprising a plurality of battery units arranged along a length direction; and at least two support components configured to provide support for the plurality of battery units, each of the at least two support components being fixed to a side of one of the at least two battery unit array structures in a height direction, wherein the at least two battery unit array structures are arranged along a width direction and correspond to the at least two support components in one-to-one correspondence, the at least two battery unit array structures and the at least two support components are disposed in the inner cavity, the box comprises an upper box and a lower box disposed below the upper box along the height direction, the box comprises at least two recessed portions disposed at the lower box of the box along the width direction, and the box has two opposite ends along the width direction, each of the at least two support components is disposed into a corresponding one of the at least two recessed portions, each of the at least two support components has a flat plate structure, and is located between a corresponding one of the at least two battery unit array structures and a bottom wall of a corresponding one of the at least two recessed portions along the height direction, and a first rib is formed between the two recessed portions, a second rib is form between one of the two recessed portions and a corresponding one of the two opposite ends, and the first rib and the second rib both protrude from the bottom wall towards the upper box, and a dimension of each of the at least one support component in the width direction is smaller than a dimension of each of the plurality of battery units in the width direction, each of the plurality of battery units of one of the at least two battery unit array structures has two ends in the width direction protruding beyond one of the at least one support component along the width direction, and the two ends abut against the first rib and the second rib along the height direction.