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US 2021/0199720 A1Published application
Device and method for checking whether contactor provided in ess is welded
AssigneeLG Chem, Ltd.
InventorYoung Hwan KIM
Life of this patent
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Abstract
The present invention relates a device and method for checking the welding of a contactor of an energy storage system without blocking the flow of current including using a contactor of two relays connected in parallel without blocking the flow of current.
Claims10
An energy storage system (ESS) configured to be always connected a power grid, the ESS comprising:
- a battery system controller (BSC) configured to determine whether to use the ESS based on a battery current, voltage, and temperature;
- a plurality of battery racks connected in series or in parallel with each other;
- a positive output terminal configured to output a power supplied from the plurality of battery racks outside;
- and
- an ESS power cut-off unit configured to block the use of the ESS by receiving a command from the BSC;
- wherein the ESS power cut-off unit comprises:
- a contactor having a first end connected to each battery rack of the ESS and a second end connected to the positive output terminal of the ESS, the contactor being configured to form an electrical path between each battery rack and the positive output terminal of the ESS;
- and
- a current measuring unit positioned on an electrical path between battery rack and the contactor, the current measuring unit being configured to measure a current of the electrical path and transmit the measured current to the BSC.
6 more elements
A method for detecting whether a contactor of an energy storage system (ESS) connected always to a power grid is welded, the method comprising:
- a current measuring step of measuring an output current of the ESS by a current measuring unit;
- a current checking step of checking whether the measured output current of the ESS is less than an allowable current of a first relay and a second relay constituting the contactor of the ESS;
- a first relay welding checking step of opening the first relay and checking whether the first relay is welded using a first detection unit when the output current of the ESS is less than the allowable current of the first relay and the second relay;
- and
- a second relay welding checking step of checking whether the second relay is welded using a second detection unit after closing the first relay and opening the second relay.
2 more elements
Dependencies are inferred from the claim text.