Battery module and method of manufacturing same

1. A battery module comprising:

a battery cell; and

a module case that contains the battery cell, wherein:

said battery cell is formed in a flat shape in which a battery assembly and electrolyte are contained in a packaging body, the battery assembly having a positive electrode and a negative electrode which are laminated or wound with a separator interposed therebetween,

said module case includes a deformation part at a position that faces a principal surface of said battery cell in the flat shape, said deformation part being angled inward or protruding toward the principal surface of said battery cell,

said deformation part is formed so as to be able to swell toward an outside of said module case when said battery cell expands,

said module case contains a plurality of said battery cells, and

at least two battery cells are disposed in said module case so as to be arrayed on an identical surface, wherein:

said module case includes:

a case part that contains said battery cells;

a board part that is provided in the case part and on which said battery cells are fixed; and

a set of cover parts that are attached to said case part and that are disposed so as to cover a front and a back of said board part respectively,

said battery cells are disposed on front and back surfaces of said board part, and

said deformation part is formed on each of said set of cover parts.