SLUUCO5A december 2022 – august 2023 BQ34Z100-R2
At low temperatures and very high discharge rates, using cell resistance directly from interpolating Ra table grids can lead to higher errors in RSOC. This is especially true near the end of discharge when cell resistance is changing quickly, which could cause undesirable drops to 0% RSOC. Fast resistance scaling is an algorithm that improves RSOC convergence to 0% by scaling cell resistance values from Ra table interpolation to reflect the most recent measured resistance.
The following terms are defined to understand the operation of fast resistance scaling:
True RSOC: The true relative state-of-charge of the battery pack, as determined by the gauge. It is computed as True Rem Q / True Full Chg Q.
Resistance voltage: A filtered cell voltage used for resistance measurements with a time constant defined by Near EDV Ra Param Filter (or Resistance parameter filter if IT Gauging Configuration[FF_NEAR_EDV] = 0).