Experience Wireless Battery Management at CES 2020

December 18, 2019

Tamer Kira  By: Tamer Kira
 Executive Director, Automotive Business Unit, Maxim Integrated 


More vehicle manufacturers are moving toward electrification, and sales of electric vehicles (EVs) are continuing to rise. While only 12% of the U.S. population, California provides nearly 50% of all EV sales in the country. Globally, China remains the leader in development and sales of EVs.1 By 2040, 57% of all passenger vehicle sales will be electric, according to BloombergNEF's analysis.2

These trends place the spotlight on the lithium-ion battery packs that drive these vehicles, as well as their hybrid and plug-in hybrid counterparts. The battery packs are filled with hundreds or even thousands of individual battery cells. For safe, efficient, and long-lasting operation, precise management of these battery cells is essential. It's critical to ensure that the cell voltages are carefully monitored and balanced. Temperature must also be closely monitored and diagnostics must be continually run to make certain the system is fully operational.

To keep battery packs safe, you need a fast and accurate battery management system (BMS). Maxim has a long history of automotive design expertise, including in BMS technology. Now we're adding a wireless BMS solution to our portfolio, and we invite you to see it in action at CES 2020. Our demo compares a wired and wireless BMS solution based on an ISM-band radio. The wireless architecture (see Figure 1) features an RF gateway client that acts as a central controller. This controller communicates with all secondary nodes. Each BMS secondary node communicates data wirelessly back to the gateway. The secondary nodes also each interface to a MAX17853 14-channel, high-voltage ASIL D battery monitor via SPI. In a normal application, the gateway device would communicate to a host microprocessor to provide measurement and diagnostic information. In the demo, the gateway communicates to a host PC to display measurement information.

Schedule a meeting with us at CES to see the wireless BMS demo and discuss your project needs by emailing me at tamer.kira@maximintegrated.com or by contacting your local account representative. The demo and our tech experts will be in our private automotive demo room.

Wireless BMS demo diagramFigure 1. Wireless BMS demo diagram

Wireless BMS Increases Vehicle Efficiency

By replacing the traditional wired connections that run between the battery pack and the BMS modules, a wireless BMS solution provides many benefits:

  • Reduces weight by reducing wires and connectors
  • Reduces cost by eliminating inter-module isolation components
  • Reduces manufacturing complexity and manufacturing time
  • Increases flexibility of pack shape

Communication between the gateway and secondary nodes is encrypted and, with a STAR topology, data delivery is robust. Eliminating wiring and related components can also enhance vehicle efficiency and extend driving range. For more details, contact me at tamer.kira@maximintegrated.com.

Wireless BMS ConfigurationFigure 2. In this image, the top row shows the wireless BMS configuration while the bottom row shows the wired approach.

Closeup of wireless BMS demoFigure 3. Closeup of wireless BMS demo.

Battery Monitor IC Meets ASIL D Requirements

One of the key components of our wireless BMS demo is the MAX17853 battery monitor IC. It's the market's only mid- to large-size cell battery management solution that enables ASIL D compliance for temperature, cell voltage, and communication. By supporting multiple channel configurations (8 to 14 cells) with one board design, the IC can reduce your design time by up to 50% through reduced validation and qualification time. For more insight on addressing the mechanical and electrical challenges that arise when designing a smart sensor for an EV battery, read the design solution, "Why Fast Time-to-Market Calls for Flexible EV Battery Management Systems."

I look forward to sharing our wireless BMS demo featuring MAX17853 at CES. Also, at the automotive demo room, we'll showcase other solutions to help you design safer, smarter cars, including IR gesture, local dimming display, secure automotive authentication, and Gigabit Multimedia Serial Link (GMSL) SerDes technology. See you in Las Vegas!

Sources

1 https://interestingengineering.com/6-interesting-statistics-about-electric-vehicles
2 https://about.bnef.com/electric-vehicle-outlook/