This slide deck covers electric vehicle charging, especially fast charging, in China. Where in Japan/North America/Europe the conversation about fast charging includes J1772’s Combo Charging System, Japan’s CHAdeMO, or Tesla’s proprietary SuperCharger, the conversation is different in China. They’re developing their own standards and not cooperating with the rest of the world.
The presentation claims the sweet-spot for using AC to charge an electric car is 240 volts, at 32 amps or below. That happens to be the rate supported by typical electric cars today. One wonders why they think that’s the sweet spot, especially since there are some electric cars that supports higher speed charging on AC – the Renault Zoe supports 42 kilowatts on 3 phase AC, and the Smart ED supports 24 kilowatts on 3 phase AC. In any case, that’s what they claim.
The DC charging they show looks like typical unit’s we’re seeing in America. A large external box containing power equipment, with a pedastal next to it. They’re powering 3 phase AC at 380 volts.
For battery swapping systems, they show “side swap” (battery pack slides out the side of the vehicle), “rear swap” (pack slides out rear), and “bottom swap” (battery replaced from below). They also show battery swap for bigger vehicles – city buses.
China has its own standards process. They’re not yet allowing 3 phase AC on a charging coupler – but it’s under consideration.
The AC charging coupler (standard code GB/T 20234.2-2011) looks like the IEC 62169-2:2010 plug that’s used in Europe. The European plug single phase or three phase, currents up to 70 amps, and up to 480 volts. Meaning, you could do proper fast charging direct off AC with this plug. The Chinese version is limited to 32 Amps, and only does single phase, but again they’re considering three phase.
The DC charging connector – GB/T 20234 – is different from either the CHAdeMO or SAE’s Combined Charging System. It uses CAN bus for charging system control.
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