NOVELTY - The battery module (100) has several unit battery cells (110) stacked along X-direction. A plate spring structured elastic frame (160) provided below unit battery cells extends along the X-direction and is elastically biased in a Z-direction. A pair of end plates (150) arranged at both end portions of unit battery cells is coupled to elastic frame via support protrusions (170).    USE - Battery module of battery pack mounted in electric vehicle (both claimed).    ADVANTAGE - Since the elastic frame elastically supports a sagging portion of the battery module, the elastic frame can effectively support a dynamic load such as impacts, vibrations generated by the stacked unit battery cells and the sagging and vibration of the battery module can be suppressed. Hence the performance of the battery module can be increased.    DETAILED DESCRIPTION - The battery module has several unit battery cells stacked along X-direction. A plate spring structured elastic frame provided below unit battery cells extends along the X-direction and is elastically biased in a Z-direction. A pair of end plates arranged at both end portions of unit battery cells is coupled to elastic frame via support protrusions. The elastic frame is directly contacted to the lower surfaces of unit battery cells. A lower frame (130) is provided between the lower surfaces of the unit battery cells and is coupled to the elastic frame. A spacer (175) is provided between the lower frame and the elastic frame and/or coupled to the support protrusions. The length of the elastic frame provided between the support protrusions is longer than the length of a shortest connection between the support protrusions. The elastic frame is provided with an elastic portion (161) bent along the Z-direction, and/or being convex toward the unit battery cells. The elastic frame is provided with support portions (162) and support grooves/through-holes (163) on the support portions, so that the support protrusions are coupled to the support grooves/through-holes. The width of the support portions is smaller than the width of the elastic portion. The end plates is equipped with a bottom flange (153), a side flange (154), and a top flange (152) so that lower frame is coupled to the bottom flange.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of the battery module.    Battery module (100)    Unit battery cell (110)    Lower frame (130)    End plates (150)    Top flange (152)    Bottom flange (153)    Side flange (154)    Elastic frame (160)    Elastic portion (161)    Support portions (162)    Support grooves/through-holes (163)    Support protrusions (170)    Spacer (175)