Patent ID: 9006920
Filing Date: 2015-04-14
Classification: B60K,B60L,H02J,Y02T

Abstract:
1. An electrical system of a vehicle with electric propulsion achieved by at least one electrical machine; the electrical system comprising: a storage section including at least one battery having a first nominal voltage and further including a plurality of cells coupled in series wherein each cell in the plurality of cells is further coupled in parallel to a respective bypass branch and coupled in parallel to respective bypass switch; a section of traction that interacts with the electric machine configured to operate at said first nominal voltage, and is the section of traction equipped with a power electronic converter configured to exchange electrical energy with the storage section; a section of auxiliaries configured to operate at a second nominal voltage lower than said first nominal voltage, the section of auxiliaries configured to provide power to auxiliary services of the vehicle requiring an electric supply, the section of auxiliaries including a buffer battery, and the section of auxiliaries electrically powered by the storage section; a first connector switch coupling the storage section to the section of traction; a second connector switch coupled in parallel to the first connector switch and coupling the storage section traction also to the section of auxiliaries; and a control unit configured to close the first connector switch, open the second connector switch, and open all the bypass switches such that the battery exhibits the first nominal voltage in order to achieve an exchange of energy between the storage section and the section of traction closes, and configured to open the first connector switch, close the second connector switch, and open a limited number of bypass switches such that the at least one battery exhibits a voltage lower than the first nominal voltage and approximately equal to the second nominal voltage of the section of auxiliaries in order to transfer electrical energy from the storage section to the section of auxiliaries.