A key indicator of a good energy storage
system is its predictability, and systems tend
to perform very differently with increased age
or low energy. Monitoring the SOC and SOH
gives us the predictability needed to integrate
a battery system into a high-performance
product."
Luis Guerrero Aguiñaga
ESS/BMS System Designer, H55
C h a p t e r 1 | S t a t e O f C h a r g e ( S O C ) a n d S t a t e o f H e a l t h ( S O H )
Like SOC, SOH can be measured in various ways, but
ultimately, the measurements are all estimations.
One major challenge of SOH measurements is that
each individual cell has a different aging profile.
Thus, a BMS needs to individually measure a cell's
SOH and use that cumulative information to make
decisions and optimize algorithms. Achieving these
tasks requires large systems that can interface with
hundreds or even thousands of cells and algorithms
capable of properly sorting through all the data.
Another major challenge is the need for accuracy,
which, like for SOC, necessitates extremely reliable
and accurate peripheral components.
Vishay helps customers design BMSs that can
accurately measure SOC and SOH by offering high-
accuracy components with tight tolerances.
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8 Industry Experts Discuss Battery Management Solutions
