Desten, a Hong Kong-based battery manufacturer founded in 2015, has produced a 900 kW ultra-fast battery charging technique which it claims to be able to charge from zero to 80% in just 4 minutes and 40 seconds.
The prototype battery and electric vehicle are ready for the charge at up to 900 kW, three times the peak value of the available cars at the moment (270 kW – Porsche Taycan).
Desten did not go into depth about the chemistry of the batteries, but they are likely to be utilized in the forthcoming Piëch GT, which will have a 75 kWh battery and be able to recharge in 5 minutes. This car will have a WLTP range of 500 km (311 miles) and use 150 Wh/km (241 Wh/mile) of energy.
Desten highlighted that the time needed to charge and the number of charging sessions required would be reduced with an increase in battery charging power, in turn, by increasing the vehicle’s regenerative braking capacity,” claimed the report.
Furthermore, Desten’s innovative battery cells last for a long time and maintain 80% of their initial capacity with at least 3,000 charging cycles and over 1.5 million kilometers of total driving capacity.
Desten ultra-fast charging battery cell highlights
- HIGH CHARGE RATES – Less than 15℃ increase during Ultra-Fast Charging, against ambient temperatures
- HIGH POWER – Constant and reliable high-power delivery
- HIGH THERMAL STABILITY – Temperature increases strictly within 15℃ during Ultra-Fast Charging
- LONG LIFECYCLE – Over 3000 charge cycles to 80% State of Health (SoH)
- SAFETY AND RELIABILITY – UN 38.3 Certified by an independent testing laboratory
- PROPRIETARY MATERIAL – Cell materials discovered, developed, and optimised for formulation in-house
- BROAD TEMPERATURE RANGE – Suitable for all climatic conditions
If all that is not sufficient, the new battery technology will have even more benefits. The new cells do not require cooling because they only warm up slightly during ultra-fast charging, with the temperature rising by only 15°C.
According to the Chinese company’s website, the new cells have a 19 Ah capacity and an energy density of over 160 Wh/kg and 350 Wh/l. This information gives us a better understanding of the performance of the new cells. This indicates that cells are powerful but not energy-dense. These come with a maximum charge rate or discharge rate of 10C.
Although a simple battery pack/lack of cooling will yield some benefits, in total, it may be heavy – a 75 kWh battery would need 468 kg of battery cells (plus everything else in the battery pack, like cables, electronics, modules, enclosure).
Two questions remain: (1) how much do these new batteries cost? (2) how much do they replace the existing expensive fast charging LTP batteries already used in electric buses (per kWh unit)?
Battery cell specs
- Cell Capacity: 19 Ah
- Energy Density (Volumetric): 350 Wh/L
- Specific Energy – (Gravimetric): >160 Wh/Kg
- Specific Power: 1600 W/Kg
- Max Charge Rate / Discharge Rate: 10C
- Temperature Change During Charging: <15℃
- fast charging from 0 to 80% in 4 minutes and 40 seconds
- Charge Cycles (100% DoD): >3,000