Battery Module, Battery Pack Comprising Battery Module, and Vehicle Comprising Battery Pack

Disclosed is a battery module, which includes a plurality of battery cells stacked on each other, a module case configured to accommodate the plurality of battery cells, a thermal resin filled in the module case to cover electrode leads of the plurality of battery cells at least partially, a laser sensor provided to the module case to measure a filling length of the thermal resin, and a control unit configured to control filling of the thermal resin based on the filling length information measured by the laser sensor.