A battery module includes a rigid external casing made, for example, of a metallic sheet material. Securement features, tabs, and so forth may be formed in the material of the casing. The casing may be made by stamping and bending metallic sheet. A liner is disposed in the casing, and one or more battery cells are disposed in the liner. The liner may comprise an insulative sheet material that is cut and folded to generally conform to the casing. The structure may include a bus bar assembly, compression members, a thermal component and other structural and functional elements.