- Our analysis shows: 100 km range in 4.5 minutes is realistic
- Decrease in charging power with increasing SOC
- Average charging power at 20-80% SOC
- C rates over the course of the loading process
- How fast is the range recharged??
- Comparison with the Audi e-tron
- Comparison of the charging performance
- Comparison of the C rates
- Comparison in terms of range reloading
Our analysis shows: 100 km range in 4.5 minutes is realistic
The Hyundai Ioniq 5 should be able to charge extremely quickly with its 800-volt system. According to the manufacturer, the electric SUV can be charged from 10 to 80 percent in just 18 minutes on a 350 kW column.
A quick charge test has now been found on the Internet. It was published in the German electric car forum Goingelectric. The charging curve shows a charging process from 10 to 80 percent at an 800 volt charging station that can deliver 350 kW.
Hyundai Ioniq 5: Charging curve (Image source: goingelectric.de)
Since the Hyundai Ioniq 5 (like all electric cars based on the E-GMP platform) could be one of the best electric cars on the market when it comes to fast charging, we are trying a fast charging analysis.
Decrease in charging power with increasing SOC
The maximum charging power seems to be over 230 kW – it is probably around 235 kW. A really high value.
The charging power decreases sharply in the course of the charging process, but in small steps. It remains above 100 kW up to a charge level (SOC) of 80 percent. How the charging curve continues above 80 percent (i.e. when the battery is almost full) remains open for the time being.
Average charging power at 20-80% SOC
According to the charging curve shown, the charging process from 10 to 80 percent SOC took about 18 minutes. This corresponds exactly to the information provided by Hyundai. According to the manufacturer, the car should also be able to recharge electricity for 100 kilometers of WLTP range in 4.5 minutes.
According to the curve, the average charging power in the very important area of 20 to 80 percent SOC is around 147-150 kW (maybe a little less). This corresponds to 63-65 percent of the maximum charging capacity.
C rates over the course of the loading process
Assuming that it is the large 77 kWh battery with 72.6 kWh usable capacity, a maximum C-rate of around 3.0C is calculated. That’s pretty amazing.
As a reminder: The C-rate indicates how the charging power relates to the capacity of the battery. 1C results, for example, if a 73 kWh battery with 73 kW charging power is fully charged in one hour. 2C would be enough to charge the battery in half an hour.
The average C-rate when charging from 20 to 80 percent SOC is closer to 1.9 C. But even this value should be reached at most in the case of most other models – if at all.
The net battery capacity of 72.6 kWh makes up about 94% of the total battery capacity.
How fast is the range recharged??
How quickly the range can be recharged depends on the power consumption, which in turn depends on the consumption cycle. In the case of the Hyundai Ioniq 5, we assume the WLTP range:
Assuming a WLTP range of 480 km and the available battery capacity of 72.6 kWh, this results in a power consumption of 151 Wh / km or 15.1 kWh / 100 km.
The average speed of range replenishment when charging from 20 to 80 percent would then be 16 km / minute. [Calculation method: The average charging power when charging from 20 to 80 percent (with the Ioniq 5 it is 147 kW, see above) is divided by the power consumption in Wmin / km.]
Again, the results are excellent. The Hyundai Ioniq 5 has the potential to achieve an average that other models normally only achieve at the top.
The maximum value is over 25 km / minute, i.e. about 113 km in 4.5 minutes. This roughly coincides with the statements by Hyundai, according to which 100 km WLTP range can be recharged in 4.5 minutes.
Comparison with the Audi e-tron
Comparison of the charging performance
Let’s compare these results with one of the world’s best models in terms of DC fast charging – the Audi e-tron quattro 55 (version from 2019):
The Hyundai Ioniq 5 has a significantly higher peak performance in the SOC range of 10 to 80 percent. For more than half of the charging hub under consideration, the charging power is above the charging power of the e-tron, although the battery of the Ioniq 5 is smaller (77 instead of 95 kWh).
But if you look at the entire range from 20 to 80 percent SOC, the difference is not great: the average charging power for both cars is just under 150 kW.
We can’t say anything about the range beyond 80 percent.
Comparison of the C rates
When comparing the C rates, the secret of the Hyundai Ioniq 5 reveals itself: Its battery is initially charged with up to 3.0C and is heavily loaded in the process. In contrast, Audi expects its e-tron to have an almost constant load of 1.5C:
Comparison in terms of range reloading
Finally, let’s compare the speed at which the range is recharged. Here the Hyundai Ioniq 5 flattens the Audi e-tron:
The Hyundai not only charges with high power, it is also very economical. It charges range 30 percent faster than the Audi (between 20 and 80% SOC).
It also has a slightly larger WLTP range than the e-tron (around 10 percent). Overall, that should make a noticeable difference on longer journeys.
Here is a little summary:
|Comparison of the quick load capabilities|
|System performance||Charging power
|Audi e-tron quattro 55 2019
|155 kW||149 kW||1.6||1.6||12.4 km / min|
|Hyundai Ioniq 5 2021
|3.0||1.9||16.0 km / min|
The charging curve shown above suggests that the Hyundai Ioniq 5 is reaching a new level in charging speed: 2C and over 15 km / min on average (20-80% SOC) and 3C and over 25 km / min at its peak.
Now we are eagerly awaiting further charging curves from the real world or data from a reliable source that confirm or invalidate this example.
|Hyundai Ioniq 5: Result of the fast charge analysis
Battery (net / gross): 72.6 / 77 kWh
[Data source: Goingelectric.de]
|Charging power (max.)
C rate (max.)
Charging performance (average, 20-80% SOC)
approx. 147-150 kW
|Range reload (average, 20-80%):|
|WLTP||16.0 km / min|
More about the Huyndai ioniq 5: Hyundai Ioniq 5 (2021): beautifully simple and surprising cockpit
Hyundai Ioniq 5 compared to VW ID.4 and Nissan Ariya
- Some values on the charts are estimates based on the data source
- The temperature of the battery cells can have a very negative effect on the charging capacity. We have no data on the temperatures of the battery at the beginning and during the charging process. At low or high temperatures and after very dynamic driving, the charging power can be significantly lower than indicated in the diagrams. In extreme cases, the charging process can even be completely impossible.
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