Exhaust-gas turbocharger

The invention relates to an exhaust gas turbocharger (1) including a turbine housing (2) and a turbine arranged in the turbine housing. The turbine housing (2) includes two exhaust gas channels (3, 4) separated by a partition (5) from one another. A wastegate valve (6) may be arranged such that the at least two exhaust gas channels (3, 4) are connectable to a bypass duct (7) bypassing the turbine. The wastegate valve (6) includes a hollow valve body (8) and a valve seat (9) interacting with the valve body (8). The wastegate valve (6) may be configured such that a ram supercharging operation and a pulse supercharging operation is activated depending on a degree of opening of the wastegate valve (6). A connecting opening (10) may be arranged between the at least two exhaust-gas channels (3, 4). The valve body (8) may have a base region (13) configured to facilitate a discharging of an exhaust-gas steam (17) into the bypass duct (7) or an overflowing through the connecting opening (10) into the other exhaust-gas