Re: Extra Battery, How to Integrate with 24kWh Traction Battery?
Posted: Fri Mar 30, 2018 9:15 am
So my takeaway from this is that in this parallel battery scenario, the BMS for the main batt is going to request a certain amperage based on the state of the main battery, and the add-on is going to take some of that, slowing the charge rate. The upshot being that the whole charging process will go slower that it theoretically could if additional amperage for the add-on were requested. This will be tempered by the amount of time the charger spends at it's maximum output where we couldn't charge any faster anyway.TonyWilliams wrote:But, there is a continuous measuring of both pack and cell pair voltages. It’s just done in the vehicle. The BMS is monitoring that, and sending that amp request every 100ms.
Sounds like a fun project that you have started. One thing to understand in any of the various DC fast charge standards is that the vehicle ALWAYS controls the charge rate. The charger is a dumb box, doing what it is told, within the programmed limits.