US 12,407,169 B2
Energy coupling method and system for household energy storage
Daqing Wang, Shenzhen (CN); Tao Wang, Shenzhen (CN); Gang Xiao, Shenzhen (CN); and Junhua Jiang, Shenzhen (CN)
Assigned to FranklinWH Energy Storage Inc., San Jose, CA (US)
Filed by FranklinWH Energy Storage Inc., San Jose, CA (US)
Filed on Sep. 8, 2023, as Appl. No. 18/464,186.
Prior Publication US 2025/0088005 A1, Mar. 13, 2025
Int. Cl. H02J 3/32 (2006.01); H02J 3/00 (2006.01); H02J 3/38 (2006.01); H02J 9/06 (2006.01); H02M 1/36 (2007.01)
CPC H02J 3/322 (2020.01) [H02J 3/001 (2020.01); H02J 3/38 (2013.01); H02J 9/062 (2013.01); H02M 1/36 (2013.01); H02J 2300/24 (2020.01)] 18 Claims
OG exemplary drawing
 
1. An energy coupling method for household energy storage, comprising:
connecting an alternate current (AC) output from an electric vehicle (EV) to a household electricity grid through an AC-to-AC power converter, the AC-to-AC power converter being capable of outputting a vehicle-to-load (V2L) AC power that is synchronized to the household electricity grid, wherein the household electricity grid includes an energy management system (EMS) and a battery energy storage system (BESS);
in response to an outage of an electricity grid that supplies power to the household electricity grid, turning on the AC-to-AC power converter to supply the V2L AC power to a household load connected to the household electricity grid and controlling the BESS to supply a backup AC power to the household electricity grid by the EMS, by performing:
obtaining an amount of energy stored in the battery of the EV and an amount of energy stored in the battery of the BESS;
based on the amount of energy stored in the battery of the EV and the amount of energy stored in the battery of the BESS, determining an output rate of the V2L AC power and an output rate of the backup AC power, such that the amount of energy stored in the battery of the EV and the amount of energy stored in the battery of the BESS are discharged in an equal amount of time, respectively; and
based on the determined output rate of the V2L AC power and the determined output rate of the backup AC power, supplying the V2L AC power and the backup AC power to the household electricity grid; and
in response to a recovery of the electricity grid, turning off the AC-to-AC power converter to stop outputting the V2L AC power.