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c-BMS in a light electric vehicle (LEV)

The demand for high-quality, safe and yet compact and cost efficient BMS for the increasing 48-72V L-EV market, continue to grow rapidly. With the new c-BMS from Lithium Balance, the battery engineers will get even better opportunities to meet the demands.
The application note will summarize the key benefits of the c-BMS and how it can be applied into a typical Light Electric Vehicle (L-EV) application.

Key benefits of the c-BMS in a 48V golf car:

  • The c-BMS is extremely compact in size (150 x 70 mm) and therefore easy to install in any L-EV.
  • As a product designed for ISO26262 compliance and with ASIL C rating for all safety critical circuits; Power Supply, Cell voltage, Pack temperature and Pack current, the c-BMS is an extremely cost efficient, 24 channel BMS.
  • The c-BMS, with a compact and cost efficient design, will further improve the cost/benefit of replacing L/A batteries with Lithium batteries in L-EV’s and therefore contribute in bringing safer L-EV’s with higher range and performance into the market place.
  • In particular Golf vehicles, that often operate in high temperatures, the c-BMS, with its high accuracy on cell voltage, temperature, is highly appreciated.
  • The sophisticated balancing algorithm of c-BMS is also contributing to a fast and efficient balancing of cells.
  • The fast and easy configuration of the c-BMS through the c-BMS Creator allow fast integration in the vehicle and thus rapid prototyping. c-BMS Creator PC software, allows a fast integration of the battery and BMS into the vehicle.

Step-by-step application of the c-BMS battery management system

Step 1

The first step in the application of c-BMS is to ensure a safe mechanical battery construction. In this specific case a fingercell battery construction is made.
The fingercells are welded in a plazma welding machine.

Step 2

The battery box for the Golf car is configured as a 14p96s bringing the entire system to a 48V/210 Ah battery.

Step 3

The c-BMS is mounted on top of the battery box. The c-BMS wire kit with connectors consist of:

  • 100930: Power, General Purpose I/O and CAN
  • 100931: Temperature and current sensor
  • 100932: Cell, load and charger voltage

Step 4

The finished battery is securely positioned under the driverseat in the Golfcar, providing optimal balance and easy access for service.

Step 5

The c-BMS is configured for optimal performance through CAN UDS or with Lithium Balance proprietry c-BMS Creator. The c-BMS Creator is a PC toolbox, that will allow the battery engineer to design a unique battery, which is specifically optimized for the application performance and the battery cell chemistry chosen for the application.

  • Optional: Connect display/SOC indicator to c-BMS
  • Optional: Connect to BatAnalytics datalogger and on-line battery data bank server.

Step 6

The following considerations should be taken, where Lithium Balance application engineers can support:

  • Configuration of c-BMS to ensure correct cell setting, I/O, charge/discharge compensation.
  • SOC optimization and of course safety regulations incl. charger set-up.
  • Battery configuration including Power Disconnect unit electrical design.
  • Battery cost calculation incl. weight estimation, size, cell configuration.
  • End-user TCO analysis consultancy to ensure correct parameters for calculation of cost/benefits between L/A and Lithium.
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