BMS for Large UPS

System Overview

Deco Jones developed for large-scale UPS power supply lithium battery management system products, a total of ± 192V (384V) and ± 240V (480V) two systems, according to user environment have the following categories (according to cost from low to high ):

Stand-alone system (does not support parallel use):

Type A: The UPS charging current and discharge termination can be controlled by the communication protocol.

Type B: no communication protocol or communication protocol but does not support BMS control UPS charge and discharge current.

Parallel system (supports parallel to 32 battery cabinets)

Type C: The UPS charging current and discharge termination can be controlled by the communication protocol. The UPS supports multi-battery cabinet management including communication with multiple battery cabinets, management of online and offline battery cabinets, data aggregation, and hierarchical display of battery parameters.

Type D: no communication protocol with the UPS or communication protocol but does not support multi-battery cabinet management technology. This model requires the installation of Level 3 Battery Management System (GBMS) and parallel module (with touch screen).

Product Model Name Method:


DJ ---- DJG  UPS-specific code

x ----- Battery material properties, F = lithium iron phosphate, 3 = 3 cells

15S-module batteries string, lithium iron phosphate support 15s and 16s, 3 yuan battery support 13s and 14s

xx ---- battery cabinet module series number, 384V = 08,384 = 10

D ---- tandem module is divided into positive and negative two groups (with center line), S = tandem module is a single module

xxxA ---- maximum charge and discharge current A

-x ---- A = Stand-alone protocol control, B = Stand-alone without protocol control, C = Parallel machine with protocol control, D = Parallel machine without protocol control

This product is suitable for 384V (± 192) system UPS power supply,

The module is 15s48V lithium iron phosphate, a total of eight modules, the total voltage of 384V, divided into positive and negative two 192V each. The maximum charge and discharge currents were 50A / 63A / 100A / 125A / 160A / 250A, can work independently, Can operate independently with UPS management that supports multi-cabinet battery management. Support up to 32 parallel.

System Block Diagram

Odoo • Image and Text

Figure 1: Cabinet-level battery management system (CBMS), front-line version


  • Support 120 series single 3.2V lithium iron phosphate batteries in series

  • Support the midline structure, support positive and negative battery charge and discharge respectively

  • Shunt circuit breakers support B +, B-, the center line at the same time closing and disconnecting

  • charge and discharge with the mouth design

  • BMS + BMU two-tier architecture

  • Intelligent balanced management, supporting intra-module balance and inter-module balance

  • SOC estimation error ≤5%

  • LCD display real-time display battery and BMS status (optional, 3.5-inch, 7.0-inch optional)

  • Support and UPS protocol communication, RS485 and CAN2.0 communication, support for multi-channel dry contact communication

  • Support PC to view the battery data and BMS status of each device through Ethernet

  • Support room management system or other higher level management equipment protocol communication

  • Support for distributed thermal management (48v battery module independent cooling) or centralized thermal management (the entire cabinet unified cooling)

  • Support UPS DC start function (option)

The BMS system consists of a 2-level architecture, the module-level management system for the BMU, responsible for collecting single cell voltage, module temperature, distributed cooling, battery balancing, and higher-level management system communication and other functions.

CBMS management system is responsible for positive and negative battery current detection, data acquisition and analysis, alarm and protection control, communication with the upper and lower levels, etc.,

CBMS including the main circuit breaker, charge and discharge dual control switch circuit, high voltage Isolation detection circuit, parallel processing circuit, high-voltage power supply and DC start-up circuit, LCD display, CBMS control box and related wiring components.