Wireless BMS gives supercar batteries a second life
The project to develop the C_Two electric supercar with acceleration of 0 to 60mph in 2s and a top speed of 412 km/h (258 mph) has continued despite the Covid-19 pandemic.
“There’s no doubt that the pandemic has had a major impact on the industry and we see several megatrends accelerated as a result,” said Patrick Morgan, Vice President Automotive at Analog Devices (ADI). “People are spending time in their cars so 3D immersive sound, the cabin experience is an important part of the experience, so we see a new technology to cancel out some of the noises. An EV is so quiet you may notice the road noise so its important to cancel that out for an immersive experience
“The second is around range, and the electronics have to be very accurate so every last bit of charge can be put in and taken out of the battery.”
The wireless BMS technology, acquired with Linear Technology in 2017, helps to achieve a range oof 550km (341 miles) but can also be re-used in stationary applications such as home battery packs attached to solar panels.
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“On sustainability there is a lot of work going on but we are not doing enough,” said Matija Gracin, Director of Components R&D at Rimac Automobili.
“Battery cells could be recycled to 90 percent and there is also the second life of the cells,” said Gracin. “You can use them for many other applications, for example for fast charging stations and we see some of the big OEMs moving in that direction with transportable or fixed charging in households.”
Wireless BMS is a key technology both for increasing the range of vehicles and also for second life applications, says Morgan.
“For second life, it offers a different way to architect the battery pack,” he said. “If you have a modular pack with a wireless BMS you can mix and match them for other applications. You can have the data follow the cell, accurate state of health and state of charge calculations, having that data wirelessly gives benefits to predicting the lifetime.”
The battery technology will also have to change, says Gracin.
“98 percent of our effort goes into the battery,” he said. “We have reached the limit with chemistries. For last 10 years not a lot has changed, and they will need to change in the future. We are squeezing everything out of the batteries.”
The Rimac C_Two is set for a limited production run of 150 vehicles in 2021 priced at €2m.
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