Flexibly packaged square battery and pressure controllable module

The invention provides a flexibly packaged square battery and a pressure controllable module, and belongs to the technical field of batteries. The battery module comprises a module shell, a plurality of battery monomers connected through flexible connecting wires are arranged in the battery module, and buffer structures are arranged between the battery monomers and between the plurality of battery monomers and the module shell; a battery shell of each battery monomer comprises a pair of first wall surfaces and a pair of second wall surfaces, and the first wall surfaces are telescopic surfaces; the first wall surface is the wall surface in the thickness direction of the battery monomer; a plurality of first concave-convex marks are pressed on the first wall face in advance, and the first wall face can be unfolded or compressed in the transverse direction when bearing battery expansion internal force or external pressure. The active pressure control device can adapt to expansion of the battery cells at any posi