US 12,088,103 B2
Direct current distribution based charging/discharging system for battery formation
Hong-Kyun Kim, Daejeon (KR); Ik-Jae Lee, Daejeon (KR); Jong-Kwang Shin, Daejeon (KR); Tae-Wook An, Daejeon (KR); Chang-Sin Yeo, Daejeon (KR); Hee-Seung Wang, Daejeon (KR); Chan-Hee Lee, Daejeon (KR); and Ji-Su Hong, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/795,375
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Nov. 11, 2021, PCT No. PCT/KR2021/016473
§ 371(c)(1), (2) Date Jul. 26, 2022,
PCT Pub. No. WO2022/103183, PCT Pub. Date May 19, 2022.
Claims priority of application No. 10-2020-0152311 (KR), filed on Nov. 13, 2020.
Prior Publication US 2023/0055592 A1, Feb. 23, 2023
Int. Cl. H02J 3/32 (2006.01); H02J 7/34 (2006.01)
CPC H02J 3/32 (2013.01) [H02J 7/345 (2013.01); H02J 2207/20 (2020.01)] 8 Claims
OG exemplary drawing
 
1. A direct current (DC) distribution based charging/discharging system for battery formation, comprising:
a main power conversion unit configured to convert alternating current (AC) power from an AC power network to DC power having a reference voltage and output the DC power to a DC grid;
a power system configured to detect the output power of the main power conversion unit;
a charging/discharging unit including:
a plurality of chargers/dischargers coupled to the DC grid; and
a plurality of batteries in a one-to-one relationship with the plurality of chargers/dischargers;
a general control unit configured to selectively transmit a first control signal commanding a charge event or a second control signal commanding a discharge event to each charger/discharger based on a formation schedule when the output power of the main power conversion unit is greater than a first threshold power; and
a first protection unit electrically coupled between the DC grid and an external power network, the first protection unit being configured to prevent a voltage rise of the DC grid,
wherein each charger/discharger is configured to:
convert the DC power of the DC grid to charge power and charge a corresponding battery of the plurality of batteries in response to the first control signal,
convert discharge power from the corresponding battery to DC power and output the DC power to the DC grid in response to the second control signal, and
stop charging and discharging the corresponding battery while the first control signal and the second control signal are not received,
wherein the general control unit is configured to transmit a stand-by command to the first protection unit when the output power of the main power conversion unit is equal to or less than a second threshold power, which is less than the first threshold power, and
wherein the first protection unit is configured to selectively form a current path from the DC grid to the external power network in response to the stand-by command.