BATTERY CELL, BATTERY MODULE AND AUTOMOBILE

A battery cell (100) comprises a housing (3), a cover plate (4), a terminal post (5) and an electrode core. The housing (3) has an opening (32). The electrode core is disposed in the housing (3). The cover plate (4) covers the opening (32) and comprises a cover plate body (42) and a cover plate expansion cavity (41) protruding with respect to the cover plate body (42). The terminal post (5) is disposed on the cover plate body (42) and is electrically connected to the electrode core. The electrode core comprises an expansion end (11) provided with a terminal post fitting region (112) and an expansion region (111). The terminal post fitting region (112) is recessed with respect to the expansion region (111) to form a terminal post installation space. The terminal post (5) is at least partially located in the terminal post installation space. The expansion region (111) is at least partially accommodated in the cover plate expansion cavity (41). La présente invention concerne un élément de batterie (100), compren