NXP launches new battery controller IC to optimize the performance and safety of battery management systems

Recently, NXP launched a next-generation battery controller IC designed to optimize the performance and safety of battery management systems (BMS). NXP's MC33774 18-channel analog front-end device provides cell measurement accuracy as low as 0.8 mV and excellent cell balancing force over a wide temperature range. It supports functional safety level ASIL-D and is suitable for high voltages that are closely related to safety. Lithium-ion batteries to fully exploit the available capacity.

Lithium-ion batteries are widely used in electric vehicles due to their high energy density per unit volume and weight, low self-discharge rates, low maintenance costs, and their ability to withstand thousands of charge and discharge cycles. Batteries account for approximately 30% to 40% of the total cost of electric vehicles. A typical 800V lithium-ion battery system consists of approximately 200 individual battery cells connected in series.

Accurately estimating the state of charge (SoC) of a battery pack at any given temperature and instant is critical over its multi-year life cycle. NXP's MC33774 provides accurate battery measurements over the entire life cycle over the full temperature range of -40°C to +125°C, enabling highly accurate range predictions.

Li Xiaohe, vice president and general manager of the new energy and drive system product line at NXP, said: "MC33774 has undergone a rigorous design and verification process to ensure its safety and reliability in automotive applications. This includes testing through system-level verification Electromagnetic compatibility, electrostatic discharge performance, transient immunity and communication reliability in harsh scenarios. MC33774 is designed to reduce the cost of OEM systems while maintaining their reliability, ensuring that the electric vehicle industry can achieve success even with short development cycles It also allows the car to be put on the market safely.”

It is understood that the MC33774 lithium-ion battery cell controller uses NXP's SmartMOS SOI (silicon on insulator) technology to provide battery measurement accuracy as low as ±0.8 mV, helping to ensure that nickel manganese cobalt (NCM) and lithium iron phosphate (lithium iron phosphate) LFP) battery chemistry lifetime performance. The precision design and calibration technology of NXP MC33774 can save customers the cost of end-of-line inspection (EOL) calibration.

The NXP MC33774 18-channel Li-ion battery management system IC is part of NXP’s high-voltage BMS chipset solution, which includes future products such as the MC33777, a battery junction box controller for pack-level measurements, as well as already released MC33665 battery management communication gateway.

This comprehensive and powerful BMS system solution provides a battery system that is developed successfully the first time while striving to avoid accidents in the field. The complete design package includes production-grade software and functional safety libraries to help speed the development of functional safety systems and save system costs.

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