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48 V Battery Management System (BMS)

48 V batteries tend to be created using Li-ion multi-cell battery packs using 8-16 cells. From a safety perspective, but also to ensure the best efficiency and longest battery life these battery packs need to be carefully monitored and controlled. This requires accurate voltage, temperature and current as well as battery state of charge (SoC) and state of health (SoH) monitoring. In addition for most efficient battery use, good cell balancing and battery optimization is a must.

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框图

V ccA V ccB E S D d i o d e D C / D C f o r M C U c o r e s u pp l y B uc k c o n v e r t e r charge balancing M O SFE T s cell 1 cell 2 24/36/48 V multi-cell bat t e r y cell n BMS IC aaa-035590 C A N- F D b u s S en s o r s ( d i gi t a l ) P T C h e a t e r 5 V L D O 3 . 3 V < 1 . 8 V A i r / W a t e r c o olin g Sensors(analog) Highlighted components are Nexperia focus products.

Charge balancing MOSFETs

Zener diodes

Autosense translators

Analog switch

ESD protection

e-fuse / regulation

Buck converter

MCU core supply

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Design considerations

  • Depending on the current being drawn some systems can use internal cell balancing topologies, but where there is a higher current then external MOSFETs are recommended.
  • Engineers also have a choice between passive and active cell balancing, although active cell balancing is often more complex give, its need for charge storage elements
  • Zener diodes utilized in the cell balancing stage protect the FETs and battery cell

Product listing

Charge balancing MOSFETs

Autosense translators

Analog switch

Buck converter

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Providing a true alternative to D²PAK, Nexperia’s LFPAK88 delivers industry leading power density in truly innovative 8mm x 8mm footprint.

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