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4.7. Battery charging
The BMM sends to the application via the CAN Open bus the maximum continuous charge
current allowed (IMR_C) and the instantaneous charge current allowed (IMR). Exceeding IMR
value might lead to preliminary aging.
During charge, the BMM controls the battery physical parameters (cell voltages, current and
temperature) and informs the application about some warning first and alarms then.
IMR / IMR_C depend on 2 parameters:
o
Battery temperature
o
Battery SOC: IMR_C is decreased to 50% between 85% SOC to 100% SOC
Figure 14: IMR & IMR_C versus SOC profile
4.8. Charge profile description
The charge consists in a CC/CV (Constant Current / Constant Voltage) charge type.
The maximum continuous charge current
IMR_C
and the maximum dynamic charge current
IMR
depend on the temperature. Both of them are sent on CAN bus.
The maximum charge voltage
VMR
is sent on CAN bus by the BMM. Nevertheless, it is
possible to charge the module with a lower value; the available capacity will be therefore
smaller.
The battery
can be let in “floating” charge during phase 3.