Methods, systems, and devices for maintenance and optimization of battery cabinets

A method implemented by a controller within an uninterruptible power supply (UPS) system, the method comprising:

• determining a forward bias condition of a diode, wherein the diode is coupled between a direct current (DC) bus and a plurality of lithium-ion battery cells;
• transitioning a by-pass relay from an open position to a closed position, wherein:
• the by-pass relay has a first terminal electrically coupled with an anode of the diode and a second terminal electrically coupled with a cathode of the diode;
• and
• the UPS system further comprises a lithium-ion battery charger and a charge enable relay coupled in series across the cathode of the diode and the anode of the diode;
• and
• activating the charge enable relay based on a state-of-charge (SOC) of the plurality of lithium-ion battery cells and a voltage measured on the DC bus.

A non-transitory computer-readable storage medium, the non-transitory computer-readable storage medium storing instructions to be implemented on a controller within an uninterruptible power supply (UPS) system, the instructions when executed by the controller provide a method for:

• determining a forward bias condition of a diode, wherein the diode is couple between a direct current (DC) bus and a plurality of lithium-ion battery cells;
• transitioning a by-pass relay from an open position to a closed position, wherein:
• the by-pass relay has a first terminal electrically coupled with an anode of the diode and a second terminal electrically coupled with a cathode of the diode;
• and
• the UPS system further comprises a lithium-ion battery charger and a charge enable relay coupled in series across the cathode of the diode and the anode of the diode;
• and
• activating the charge enable relay based on a state-of-charge (SOC) of the plurality of lithium-ion battery cells and a voltage measured on the DC bus.