FEATURE AUTOMOTIVE ELECTRONICS
Building BMS systems for the EV Supercar
maximum energy and capacity out of its batteries by delivering highly accurate battery cell measurement. Sophisticated diagnostics enable the system to monitor cell characteristics, voltage, and temperature and to determine charge state at any given time. “Precision accuracy directly translates
to maximising battery capacity and range with fast charging time,” said Patrick Morgan, Vice President. Automotive Electrification and Infotainment, Analog Devices. “Rimac is a technology powerhouse in
Rimac Automobili integrates Analogue Device’s battery management system, helping deliver a high performance super car
T
oday’s electric vehicle battery market continues to be driven not by cost
alone but the demand for longer-range vehicles, decreased charge times, and functional safety. With up to 40% of the ticket price of an electric vehicle attributed to the battery, performance and battery life become major factors in an EV’s brand success. A battery system expected to deliver
more than a hundred kilowatts of energy with the push of a pedal must operate at hundreds of volts to be efficient. However, lithium battery cells supply only a few volts. To extract enough power, a large number of battery cells are connected together in series as one long stack. A typical electrical vehicle may employ 100 individual battery cells, delivering 350 volts at the top of the stack and that presents challenges. If one cell dies in your long stack of
battery cells, you effectively lose all of them. So, you need to monitor and manage all of them - charging them, discharging them - every day for the life of the vehicle. Lithium battery cells cannot be operated to the full extent of
22 FEBRUARY 2021 | ELECTRONICS
their charge and discharge range. They must be kept in a very specific range, such as 15% to 85%, or the cells weaken. ADI’s Battery Management System (BMS)
provides accurate cell measurements from the time the pack is manufactured to its end-of-life. Electronics are attached directly to each cell in the stack, reporting back voltage and temperature, coordinated with cell current. The system figures out the state of charge and state of health. The current and temperature of every cell must be monitored through a complex algorithm at the central processor. ADI builds in a robust communication interface while allowing for a modular architecture.
ADI’S HIGH PERFORMANCE BMS POWERING HYPERCARS The Rimac C_Two high-performance hypercar boasts 1,914 horsepower, accelerates 0-60 in 1.85 seconds, and top speed of 258mph. The all-electric hypercar features a battery pack of 6960 lithium manganese nickel cells. ADI’s precision BMS integrated circuits (ICs) enable Rimac’s EVs to extract
Figure 1:
The Rimac C_Two high-performance hypercar
the field of high-performance electric vehicles. We develop and manufacture key electrification systems for many global automotive companies and raise the bar for performance EVs with our own hypercars,” said Rimac’s CEO Mate Rimac. “Our application of battery management systems are among the most demanding in the world, requiring the highest accuracy, massive current and voltage draws over very short time scales, and rapid dynamic adjustment within the battery management control system. “We have decided to adopt Analog
Devices’ portfolio of battery management ICs across our complete product line. We have benchmarked these ICs in the market and selected Analog Devices for superior precision measurement accuracy and product robustness over the lifetime of the vehicle.” “High voltage battery system
technology is ever-changing,” said Greg Zimmer, Marketing Manager for BMS, ADI. “We see a lot of pressure on increasing capacity and longevity. How is the industry going to achieve this? How will we get more energy out of the battery pack while making a battery last for 10 years, increase its range, support faster charging, and develop centralised and modular designs? A common misconception among the
average consumer is that electric vehicles are not high performance and could never match the performance being delivered by combustion engines. Together, ADI and RIMAC are helping to redefine what high performance electric vehicles are capable of achieving.
Analogue Device
www.analog.com
/ ELECTRONICS
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