Cell controller boost for battery management system

Cell controller boost for battery management system

New Products |
By Nick Flaherty

Combined with NXP’s already rather comprehensive portfolio of automotive microcontrollers (MCUs), power management system basis chips (SBCs), and communication transceivers, the battery cell controllers provide readily useable reference design platforms for controlling high-capacity energy storage in modern electric vehicles. The platforms are designed to help carmakers deliver the next generation of hybrid and electric vehicles with greater speed and less development risk.

The energy required to power the main traction motors in electric vehicles is stored in high- performance batteries made up of many individual lithium-ion cells. The accurate measurement and management of each of these cells is critical to the safety and dependability of the complete battery pack. Battery management systems are designed to monitor the critical state-of-charge, state-of- health and battery temperature of the individual cells, while precisely measuring currents into and out of the battery pack.

The new battery cell controller ICs pair with NXP’s portfolio of functional safety System Basis Chips and Microcontrollers to enable scalable Battery Management Solutions based on their industry leading precision, robust communication and advanced functional safety up to ASIL-D.

The new battery cell controllers MC33771B and MC33772B advance the state-of-the-art in measurement capability and functional integration. They

  • convert cell measurements of a 96-cell high voltage battery within < 546 us, and communicate data to the pack controller within 4.1ms with typical accuracies of +/-0.8mV after soldering over voltage, temperature, and lifetime.
  • enable highly accurate cell impedance calculations for state-of-health monitoring using unique synchronized current sensing.
  • integrate 0.8 Ohm MOSFETs with dedicated timers for each cell for effective and simultaneous charge-balancing of each cell
  • provide embedded functional safety mechanisms and diagnostics to effectively support highest functional safety goals.

More than a dozen automotive Tier-1 customers have adopted NXP’s Battery Management Solutions globally for use in production and are currently in development with multiple carmakers, said NXP expert Thomas Lenthsch. The implementations span multiple applications including economical battery management of 14V batteries, highly integrated 48V systems for Mild-Hybrid vehicles and high voltage battery stacks and junction boxes with up to 96 cells for 200 to 800 V Hybrid and Pure Electric vehicles.

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