NIO's new 75kWh battery pack technology upgrade, fully using lithium iron phosphate batteries

According to news on March 19, Weilai Automobile recently announced that after comprehensive technological improvements, its 75kWh standard endurance battery pack will soon start delivery. This upgrade has made significant progress in three major aspects: algorithm, materials and performance. What is particularly noteworthy is that the new battery pack will fully use lithium iron phosphate batteries and will no longer mix ternary lithium iron batteries.

The new 75kWh battery pack produced by CATL will soon be delivered to consumers with the launch of 2024 new cars. This battery pack has made important innovations in the BMS system. Its SOC estimation accuracy is equivalent to that of the previous ternary iron-lithium hybrid battery pack, maintaining the industry-leading level. Consumers can expect this new battery pack to bring more efficient performance and longer driving range to vehicles. As a leader in the battery industry, CATL continues to promote technological innovation and bring more advanced power solutions to the automotive industry. The launch of this new battery pack will further promote the development of the electric vehicle market and provide consumers with a better , they improved the current guiding device inside the battery core and increased the flow area. These improvements have increased the maximum charging power of the new battery pack from the original 140kW to 170kW. In addition, charging time has also been significantly shortened, with the 10-80% charging time reduced by 3 minutes to only 27 minutes.

Secondly, in order to improve performance in low-temperature environments, NIO has carefully optimized the internal resistance of the new battery pack. This will make the vehicle's feedback more rapid and direct when overtaking and other situations require instantaneous high current. In addition, by improving the design of the heating film and battery pack seal, the active and passive thermal insulation performance of the new battery pack has been further improved, thereby improving the efficiency of thermal management.

NIO has achieved fruitful results in the research and development of lithium iron phosphate battery packs. As early as 2021, they began to explore the integration of ternary lithium batteries in battery packs to assist lithium iron phosphate batteries in the accuracy correction of SOC estimation, and successfully developed the industry's first dual-system battery BMS algorithm. After two years of continuous optimization and iteration, NIO's algorithm team successfully improved the SOC estimation accuracy of pure lithium iron phosphate batteries to the industry-leading level in 2022, achieving high accuracy within 3%.

In the latest 75kWh standard battery pack, NIO has introduced a multi-scenario SOC calibration function, and also uses self-discharge and self-learning algorithms to accurately learn the self-discharge rate of lithium iron phosphate batteries . These innovative technologies effectively solve the challenge of inaccurate SOC estimation caused by consistency issues in lithium iron phosphate batteries. In addition, NIO's self-developed cloud algorithm and BMS SOC estimation data training model further improve the accuracy of SOH health status estimation of single cells, which is crucial to improving user experience.

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