The 800 V battery system is among the options that enable for considerably growing the charging energy (in comparison with typical 400 V), with out growing present values, which is essential due to the thermal properties of the charging connector and cables.
Usually, the rise of energy, by means of the rise of voltage must also make the quick charging and basic system extra environment friendly.
The South Korean producer has determined to develop the Built-in Charging Management Unit (ICCU), which affords DC quick charging at round 800 V (as much as 350 kW), in addition to on the extra frequent 400 V degree. Furthermore, the ICCU can be an on-board charger (reportedly as much as 11 kW) and might export as much as 3.5 kW of AC energy by means of the vehicle-to-load (V2L) operate.
Nevertheless, if the facility electronics are designed for 800 V voltage, it won’t work equally effectively at decrease voltage ranges – or just at 400 V DC chargers. This is the reason there may be normally one other step concerned to spice up the voltage.
In its presentation, Hyundai Motor Group reveals two instances. The primary is direct charging of the battery from the 800 V DC quick charging. The second, on the fitting, is oblique charging from a 400 V DC quick charger, that entails energy electronics (inverter) of the Built-in Drive Axle (IDA) to spice up the voltage to the 800 V vary:
We guess that the 800 V charging is likely to be not solely very fast (at ultra-high energy ranges of as much as 350 kW), but additionally very environment friendly.
Then again, we might not be stunned if utilizing the 50-150 kW chargers at 400 V can be just a few % much less environment friendly. It is likely to be truly barely much less environment friendly than in EVs natively designed for 400 V due to the extra step. That is one thing that we’ll stay up for testing.
The primary series-produced automotive that has an 800 V battery system is, after all, the Porsche Taycan, and it is also a flexible one, as a result of it may possibly function on 400 V. Nevertheless, when you use 400 V charger, the output is proscribed to round 50 kW (as a substitute of as much as 270 kW at 800 V charger). The upper ranges, like 100-150 kW at 400 V will be unlocked by shopping for a further package deal (DC to DC voltage increase converter).
Within the U.S. this feature price $460:
On-Board 150 kW/400V DC Charger
“Non-obligatory On-Board DC Charger to extend most charging capability when charging at public 400V direct present charging stations. By growing the charging capability to 150kW, the charging time is decreased.”
We guess that Porsche was compelled to restrict the facility degree at 400 V as a result of the 800 V energy electronics would wrestle to deal with quicker charging at roughly half of its nominal voltage.
Porsche Taycan – On-Board 150 kW/400V DC Charger
* all of the 800 V and 400 V numbers are simply nominal ranges, because the voltage adjustments considerably between the low state-of-charge and excessive state-of-charge.