3. System Overview
The Nuvation Energy High-Voltage BMS provides cell-level and stack-level control for battery stacks
up to 1250 VDC. The UL 1973 Recognized BMS modules in each stack ensure safe battery operation
and significantly reduce the effort of certifying the energy storage solution to meet UL 1973 and UL
9540. While the Stack Switchgear does not yet have UL 1973 recognition, it has been designed to
enable UL 1973 certification of the battery stack. For more information, please contact
Figure 1. High-Voltage BMS
A single Nuvation Energy Stack Switchgear unit manages each stack and connects it to the DC bus of
the energy storage system. The Nuvation Energy Stack Switchgear, is a pre-configured assembly that
incorporates the major functions of Nuvation Energy High-Voltage BMS into a rack-mountable unit
which includes stack monitoring, electrical disconnects, pre-charging, current sensing, fuses, and a
safety relay for E-Stop. It also includes supporting components like power supplies, indicator LEDs,
and external-facing connectors.
Cell Interface modules in each stack connect directly to battery cells to measure cell voltages and
temperatures and provide cell balancing.
The Stack Switchgear and Cell Interface modules operate together as a complete system called the
High-Voltage BMS. Available units/modules are listed below.
Table 1. Stack Switchgear and Cell Interface Modules
Model
Unit/Module Name
NUVSSG-1250-100
Stack Switchgear, 1250 V, 100 A
NUVSSG-1250-200
Stack Switchgear, 1250 V, 200 A
NUVSSG-1250-300
Stack Switchgear, 1250 V, 300 A
NUV100-CI-12-1
Cell Interface - 12 channel
NUV100-CI-16-1
Cell Interface - 16 channel
Nuvation Energy High-Voltage BMS - Product Manual
Document ID: NE-PM-003
4
Rev 1.2, 2021-03-03
Curie Update 1
