Container with thermal management

A thermal storage device (1) for storing and maintaining a body (5), such as liquid, at a constant storage temperature different to a temperature external (1') to such device, comprises: a container (4) for containing this body at the constant storage temperature; and a thermal source (3) for compensating heat transfer resulting from a thermal gradient between the external temperature and the constant storage temperature. The thermal source comprises a mass (31) for accumulating thermal energy and for transferring heat from or to the container to compensate said heat transfer resulting from the thermal gradient and maintain the body at the constant storage temperature.