Important metrics for these components in this
context include failure in time (FIT) rate and failure
mode.
FIT rate is a statistical measure used to represent
the reliability of electronic components. It captures
the number of expected failures per billion hours
of operation. For BMS components, a low FIT
rate indicates high reliability, which is essential
for preventing fault conditions in safety-critical
applications. If any of these components fails, the
results for the entire system could be catastrophic.
Failure mode refers to how a component might fail
and the effects of that failure on the system. For
shunt resistors, a failure could lead to inaccurate
current readings that affect charging/discharging
control and SOC calculations. For NTC thermistors,
a failure could result in inaccurate temperature
readings that negatively impact SOH assessments.
For HV resistors, a failure could impact voltage
measurements, resulting in inaccurate SOC and SOH
readings. In all these cases, component failures could
result in battery faults that compromise the system's
performance and safety.
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
Overcharging and over-discharging
lithium-ion batteries can result in thermal
runaway, fires, or even explosions.
Through individual cell voltage monitoring,
the BMS can identify anomalous voltage
levels that could point to a possible safety
concern. Early identification of these
irregularities enables prompt remedial
action to avoid disastrous errors."
Ganesh Chine
Battery Design Engineer, Octarange Technologies
20
8 Industry Experts Discuss Battery Management Solutions
