NIO has launched a new 75 kWh standard-range hybrid-cell battery pack which replaces the 70 kWh pack. The prices of the models with this new battery pack and their BaaS (Battery-as-a-Service) subscription remain unchanged.
As the name suggests, the hybrid-cell battery pack is a hybrid of ternary lithium (nickel-cobalt-manganese) and lithium iron phosphate (LFP) cells. This new battery pack combined with NIO’s patented technologies is claimed to offer a more extended range (I believe NIO is talking about reduced range loss) in cold weather conditions and accurate state of charge (SoC) estimation, and therefore offering a performance at the same level as the ternary lithium battery.
NIO says that it has designed a complete thermal management software and hardware system for the new 75 kWh battery pack, which reduces the range loss in low temperatures by 25% compared to the LFP counterpart. The following is a detailed explanation –
The comprehensive environment shielder applies low-thermal conductivity materials and innovative structural design for the source of heat loss in extremely cold environments to improve passive thermal insulation performance effectively. The radiant thermal compensation heater uniformly heats the battery cells to maintain the working temperature of the battery while taking into account the energy consumption. Furthermore, the hybrid layout of ternary lithium cells and LFP cells makes full use of the low-temp performance advantage of ternary lithium cells to improve the overall battery performance in low temperatures. The dual chemistry control algorithm precisely controls the performance of ternary lithium and LFP cells in cold temperatures to improve the low-temp energy efficiency of the whole battery system.
As for the SoC estimation, thanks to a robust software and hardware combo, the estimation error is claimed to be reduced to less than 3%, reaching the ternary lithium battery SoC estimation level. The dual chemistry SoC algorithm fully utilizes ternary lithium and LFP battery systems to realize constant battery SoC estimation and guarantee accuracy, NIO said.
In addition, the 75 kWh battery is equipped with a new-generation CTP (cell-to-pack) technology, which is claimed to simplify manufacturing and assembly by 10%, and increase volume utilization by 5% and energy density by 14% to 142 Wh/kg.