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What are the TE connector mating details to the Delta-Q charger?
Pinning at charger side:
Pin 1: CAN GND
Pin 6: CAN high
Pin 10: CAN low
The wiring should be as the following:
Pinning at charger side | Pinning at battery side
Pin 1 to Pin 3
Pin 6 to Pin 4
Pin 10 to Pin 5
Is a pre-charge circuit integrated in the battery?
No, there is no pre-charge circuit inside the batteries.
What happens if the modules in a battery system which are connected in parallel, have different
states of charge (SOC)?
If the modules have different states of charge within the overall battery then a common state of charge
is triggered by discharging the modules, which have a higher state of charge. Basically only the DSG
FETs are opened when the modules are switched on (not the CHG FETs). This prevents a module
with a higher state of charge from charging the modules with a lower state of charge and thus high
equalizing currents from flowing between the modules. If a load is now connected, the modules are
discharged from “full” to “empty” over time. This means that the CHG FETs are only closed when a
module with a lower state of charge is within a maximum limit (voltage delta) from the voltage of the
“fullest” module. Only at this moment is the power provided by the battery. In this way, there is an
automatic balancing of the individual modules in a system.
Important:
For this reason, if modules are changed within a system which have different state of
charge levels, we recommend first to fully charge the pack, to equalize all modules. This will prevent
one module being used within a system to handle high currents intended for multiple modules, which
could cause a safety trip in the electronics.
Can the Module accept regenerative charging at any time (without indication from CAN bus)? So
they should be able to accept charge current any time.
Yes, modules accept regenerative charging at any time within specified limits. E.g. max. 65A for 5s.
You can charge the batteries in this operating mode. But if your charger current exceeds the spec. of
the battery, this could lead to a charge current higher than recommended. E.g. the charger has 30A
current capability and is charging two batteries, one battery could be charged at 20A and the other
battery at 10A until equilibrium is reached. Of course, this depends on cycle life, age and SOC of the
batteries. In addition, you can never charge the battery before it has closed the charge FET because
of a recognized discharge current. E.g. start the battery and supply charge voltage will not work. By
charging via a CAN controlled charger, the current will always be adjusted not to exceed any
recommended charge current of any battery (also dependent on three different temperature levels).
Due to this, we can always guarantee to be in a recommended operating status while charging.
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