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Researchers developing DC micro smart grid for charging EV fleets; Li-ion, redox flow batteries and renewables

Green Car Congress

Up to 30 electric vehicles at a time can recharge in Fraunhofer IAO’s parking garage. The aim of charge@work is to design a micro smart grid (MSG) capable of supplying the EV fleet with electricity produced exclusively from renewable sources. The MSG is designed as a direct current (DC) grid. Click to enlarge.

Grid 244
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Honda opens Smart Home US in California; produces more energy than it consumes; direct DC-DC EV charging

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Honda’s HEMS leverages the battery to balance, shift and buffer loads to minimize the home’s impact to the electric grid. The system will also enable Honda to evaluate the second life, or re-use, of EV batteries in grid applications, home-to-grid (H2G) connectivity and other concepts. DC-to-DC electric vehicle charging.

DC 393
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JERA and Toyota deploy first large capacity Sweep Energy Storage System with second-life batteries

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The system was built using batteries reclaimed from electrified vehicles (HEV, PHEV, BEV, FCEV) and is connected to the consumer electrical power grid. JERA and Toyota began discussions in 2018 to establish battery reuse technologies, which eventually led to this large-capacity, grid-connected Sweep Energy Storage System.

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False Starts: The Story of Vehicle-to-Grid Power

Cars That Think

They wanted to see whether an electric vehicle could feed electricity back to the grid. The company’s president, Tom Gage , dubbed the system “vehicle to grid” or V2G. And EV owners would become entrepreneurs, selling electricity back to the grid. And indeed, that’s how promoters of vehicle-to-grid technology perceive the EV.

Grid 138
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Mitsubishi Heavy to supply 500 kWh (normal) containerized Li-ion energy storage system to power grid of Orkney Islands

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(MHI), jointly with SSE plc (formerly Scottish and Southern Energy plc), will begin an energy storage system demonstration project using the power grid in the UK’s Orkney Islands, which has a high proportion of renewable energy generation in relation to demand. The energy storage system will be installed at SHEPD’s Kirkwall Power Station.

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IDTechEx: Nio spearheading battery swapping expansion beyond China

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However, IDTechEx believes that Europe will remain a charging-dominant region with a focus on DC fast charging deployment, and the number of swapping stations will remain small. This is a unique feature of battery swapping stations that could be exploited in the future to make them act as grid-support units.

China 434
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UPA installs 500 kWh containerized Li-ion system from BYD for grid storage

Green Car Congress

BYD mega-watt-scale energy storage stations are installed in several locations in the US and are rated at a 91% AC-DC-AC round-trip-efficiency but have shown actual performance at this site as high as 95.3%—a AC-DC-AC efficiency shown to be as high as 94%, an industry benchmark high; DC to DC efficiency as high as 96%.

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