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43% more energy with same EV battery size achieved in Chinese Firefly model

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43% more energy with same EV battery size achieved in Chinese Firefly model

Nio has unveiled its new longer range 60kWh battery variant of its popular Firefly electrical vehicle (EV). This new battery provides the EV with an increased Chinese testing cycle (CLTC) rated range of 348 miles (560 km), up from 261 miles (420 km).

All this within a battery pack of the same dimensions, reportedly without increasing the vehicle’s overall weight. This is significant as it appears to offer better performance from a limited space (the battery) without adding weight.

The Firefly had an original battery capacity of 42 kWh, meaning the new battery is somewhere close to a 43 percent increase. This is stored energy capacity and doesn’t necessarily translate 100 percent into driving range.

In fact, according to reports, the increase in range is somewhere close to around 33%. This is for a variety of reasons, but part of it is due to the battery management system reserving capacity to protect new cells.

Designed by Contemporary Amperex Technology Co., Limited (CATL), the new battery uses something called ternary lithium cells. These cells have an energy density of 187.2 Wh/kg, achieving a high volumetric efficiency of 73.4 percent.

While not entirely clear, the second stat here likely relates to how efficiently the cells are packaged inside the pack, rather than its actual volumetric energy density efficiency.

If so, this would mean that the cells themselves occupy only some of the available space. The rest comprises things like structural supports, cooling systems, electrical connections, etc.

So, CATL has managed to increase capacity by combining higher-energy-density cells with more efficient packaging.


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