NIO unveils standard-range battery with better performance in colder weather
NIO has launched a new standard-range 75 kWh hybrid-cell battery it says will reduce range loss in low temperatures by 25%. It adds that the battery also gives a more accurate state of charge (SoC) estimate while matching the battery performance of a ternary lithium battery.
The battery is a hybrid of ternary lithium and lithium iron phosphate (LFP) cells using new-generation cell-to-pack (CTP) technology.
The improved range performance is achieved by using a complete thermal management software and hardware system. A dual-chemistry control algorithm controls the performance of ternary lithium and LFP cells in low temperatures to improve energy efficiency. Meanwhile, a radiant thermal compensation heater heats the cells to maintain the battery’s working temperature while taking into account the energy consumption.
Further gains in passive thermal insulation were achieved using low thermal-conductivity materials and a bespoke structural design, the company said.
The battery’s SoC estimation system, also designed in-house, reduces estimation errors to less than 3%, to the level of ternary lithium battery SoC estimation. A DC-DC converter in the battery ensures real-time and balanced SoC calibration.
The battery’s CTP technology simplifies manufacturing and assembly, increases the useable volume, and provides an energy density of 142 Wh/kg.
The battery is now available for new NIO car orders, with deliveries set for November. The prices of NIO models with the new 75 kWh battery remain the same as those for the previous, 70 kWh battery.