Battery Management System

Advanced Command and Control

For use with the U-Charge® XP battery module range, the BMS is designed to enable multiple system implementation options.

Battery Management System

Valence integrates battery management throughout the U-Charge® product line. Each U-Charge® battery contains internal circuitry to monitor and balance each cell. Through built-in communication cables, the modules are able to communicate to the U-Charge® Battery Management System (BMS), which monitors the system as a whole. The BMS initiates module-to-module balancing, as well as controls opening and closing the contactors. The BMS asserts warnings and alarms, and outputs data via digital and analog outputs. The BMS is small and compact, and can be mounted in the battery pack or remotely. It uses CANbus to communicate with other equipment and can control such items as chargers and fuel cells. The BMS can also connect to a PC/Laptop via the CANbus Monitoring Kit, for easy configuration, monitoring, or recording.

The Valence BMS comes in multiple voltage ranges, depending on the voltage of the pack that it is controlling.

Model Battery Stack Isolation Measurement Range BMS System Voltage BMS Ignition Voltage Part Number
U-BMS-MH N/A 24-48V system 24-48V enable PN# 1007833
U-BMS-LV for low voltage systems between 12 – 150VDC 12V system 12V enable PN# 1004443
U-BMS-LVM for low voltage systems between 12 – 150VDC; used in multi-BMS config 12V system 12V enable PN# 1007427
U-BMS-HV for high voltage systems between 100 – 450VDC 12V system 12V enable PN# 1004440
U-BMS-SHV for super high voltage systems 350 – 700VDC 12V system 12V enable PN# 1004437
  • For systems between 700-1000V, we recommend using the BMS-LV and powering it off of the 12V key switch source.

Note that BMS offers battery pack isolation measurements up to 700V. For 700-1000V systems that require isolation measurement, an external 3rd party device should be used.

Some battery pack systems require multiple strings in parallel using one BMS per series string for redundant purposes. For these applications, we recommend using the BMS-LVM and power it off of the 12V key switch source. The BMS-LVM allows multiple BMS units to communicate on the same CANbus line without interference.

For 24-48V systems, please use the U-BMS-MH with 12V contactors.  All other BMS’s require a 12V source to enable.  In some cases, a dc-dc converter may be added to the pack to convert the pack voltage down to 12V to provide power to the BMS as well as the contactors. The dc-dc should be able to supply at least 4 amps at 12V.

Our battery modules are energy storage devices that can be configured in a variety of ways to meet the particular requirements of an application. To do so requires a properly configured Valence Battery Management System (BMS) for the system parameters and contactors. Generic or non-Valence BMS units are not suitable for use with Valence batteries. For safety reasoning, configuring of a Valence BMS needs to be performed by Valence or its authorized reseller. We do not support Valence products that have not been purchased directly from Valence or through an approved reseller.

U-Charge® XP BMS Starter Kit

The U-Charge® XP BMS Starter Kit helps connect a XP battery system to a Valence Battery Management System (BMS).

Kit Components

  • 26 Way connector including: Connector pins for contactor control 12V / 5V supply. 35 Plugs / 13 Contacts
  • 4-way mating connector for CAN cable incl. crimps & seals
  • 26 Way connector with pre-wired RS485 (5-way) and CAN (4-way) cables
  • Guard to prevent 26-way connector reversal
  • 120Ω termination resistor

starter kit components