The Samsung SDI lithium-ion battery system is specifically approved for use with KOHLER Uninterruptible Power’s KOHLER PW 6000 (60-120 kVA), KOHLER PW 9250DPA, 9500DPA and MF series UPS systems. Samsung SDI is one of the most experienced producers of lithium-ion batteries in the world and has a long record of safely supplying systems for use in critical power systems.
Housed in a tough enclosure, lithium-ion battery technology provides reliable, lightweight and compact energy storage for UPS systems.
Each battery cabinet has dedicated battery management systems at single module and rack level, plus fuse, circuit breaker protection and a dedicated 24 V power supply.
A single cabinet configuration of 34.6 kWh comprises one switchgear, one switched mode power supply (SMPS) and 17 battery modules.
For additional battery capacity, cabinets can be installed in parallel to increase capacity up to 5 MW per single system.
Switchgear collects all information about each battery cell and controls all battery module management systems calculating state of charge (SoC) and state of health (SoH). It also contains a moulded case circuit breaker and a shunt resistor.
SMPS supplies the power for BMS and communicates with UPS and other racks in parallel. It is available in two versions with or without BMS for single or multiple parallel configuration.
Each battery module contains eight series-connected 67 Ah, 3.8 V cells and a dedicated battery module management system (BMS), which measures major parameters, controls cell balancing and interacts with the switchgear.
Cell construction is such that a safety function layer prevents the possibility of an electrical short between the anode and cathode and a multilayer separator prevents overcharging by blocking the passage of lithium ions. In terms of secondary safety a safety vent allows gas venting in case of internal overpressure, a safety fuse is present in case of short circuit and an overcharge safety device will interrupt the current in case of overcharge.
At the module level the battery management system controls voltage, temperature and charge balancing whilst indicating status with LED indicators. A non-flammable (UL94 grade V0) plastic casing is used to mechanically protect each module from external force whilst an insulating cover protects the power cable connections, themselves current rated to 470A for safety.