US 12,381,411 B2
Charging system for an energy storage in a vehicle and a method for controlling the charging system
Mikaela Öhman, Gothenburg (SE); and Victor Sandgren, Gothenburg (SE)
Assigned to Volvo Truck Corporation, Gothenburg (SE)
Filed by VOLVO TRUCK CORPORATION, Gothenburg (SE)
Filed on Dec. 14, 2021, as Appl. No. 17/644,219.
Claims priority of application No. 20216085 (EP), filed on Dec. 21, 2020.
Prior Publication US 2022/0200315 A1, Jun. 23, 2022
Int. Cl. H02J 7/00 (2006.01); B60L 53/14 (2019.01); B60L 53/62 (2019.01)
CPC H02J 7/00714 (2020.01) [B60L 53/14 (2019.02); B60L 53/62 (2019.02); H02J 7/00712 (2020.01); H02J 7/007182 (2020.01); H02J 7/007192 (2020.01)] 15 Claims
OG exemplary drawing
 
1. A charging system for an energy storage in a vehicle comprising:
a plurality of parallelly arranged charging switch units, each charging switch unit having an input terminal configured to be connected to a common charging port, and an output terminal configured to be connected to the energy storage, wherein each charging switch unit comprises a contactor configured to control a flow of current from the charging port to the energy storage;
for each charging switch unit, a measurement device configured to determine a parameter indicative of a resistance in a current path through the charging switch unit, and a variable resistor configured to control the resistance in the current path; and
a charging control unit connected to each of the charging switch units and configured to, if an estimated difference in resistance between any two of the plurality of current paths through a charging switch unit is higher than a predetermined difference threshold value, control the variable resistor of a charging switch unit in the current path having the lowest resistance to increase the resistance of that current path.