SLUUD63A December 2024 – October 2026 BQ41Z90
Figure 7-4 Cell Balance Mode DetectionThe BQ41Z90 calls the cell balancing algorithm every 1s during normal operation. Cell balancing is not called when the device is in SLEEP mode. All algorithm decisions are made on this same 1s timer.
In RELAX mode, if cell balancing at rest is enabled, Balancing Configuration[CBR] = 1, the gauge will verify if the dv/dt condition is met at the entry of the RELAX mode. If so, then the cell balance at rest will start when all of the conditions below are met:
The gauge will attempt to recalculate the cell balancing time in RELAX mode every Relax Balance Interval. The cell balancing time is updated if the conditions below are met:
On exit of the RELAX mode, cell balancing time is recalculated as long as a valid OCV update is available.
Cell balancing is paused during OCV measurement.
Figure 7-5 Cell Balance Operation in RELAX ModeWhen the BQ41Z90 is in CHARGE mode, it follows these steps during cell balancing:
There are no SOC restrictions controlling the enabling of cell balancing in CHARGE mode.
Figure 7-6 Cell Balance Operation in CHARGE ModeCell balancing in sleep can be enabled, by setting Balancing Configuration[CBS].
Once enabled, cell balancing in sleep will start under the following conditions:
Once the cell balancing in sleep is started, it will end when The value of RSOC < End Rsoc for Bal in Sleep (default 60%).