C h a p t e r 4 | B a t t e r y F a u l t P r o t e c t i o n
Key Points
• Battery fault protection in BMSs encompasses
features like overcharge protection, deep-
discharge protection, temperature control, and
short-circuit protection, ensuring safe operation
under various conditions.
• Charge/pre-charge resistors in BMSs limit
inrush currents at startup, protecting against
short circuits and voltage spikes, essential for
preventing fault conditions.
• Optocouplers in BMSs provide galvanic isolation
between high-voltage and low-voltage
electronics, safeguarding sensitive components
and ensuring safety in fault conditions.
• Shunt resistors, NTC thermistors, and HV resistors
are crucial for fault protection, with key metrics
including a low FIT rate for reliability and specific
failure modes impacting system safety.
• Vishay supplies charge/pre-charge resistors
for managing inrush currents; optocouplers for
electrical isolation; and high-reliability shunt
resistors, NTC thermistors, and HV resistors with
low FIT rates for BMS designs.
LPSA 300W / 600W /
800W Power
Resistors
PTCEL High Energy PTC
Thermistors
Surface-Mount
TRANSZORB
®
Transient
Voltage Suppressors
Automotive Transistor Output
Optocouplers
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8 Industry Experts Discuss Battery Management Solutions
