The issue with the energy flow display is that yes, it shows the ICE sending current to the battery. But what it doesn't show is how much current it's sending. I maintain it's only providing enough to maintain the charge at a certain level. The flow display has no indication of the amount of current being sent to or used from the battery. Since the traction battery continues to assist the engine, even while in HEV mode, it's going to send some energy back into the battery to hold the state of charge. It could be sending a 1 amp trickle charge, or a 20 amp stream, but we have no way of telling.
In general I agree with you but I think as we've been discussing there are a couple of situations where the ICE is running for reasons other being in HEV mode and in those cases the car will direct some of the energy to the battery possibly resulting in significant recharging. So far I think we've identified two of those cases.
1. Sport mode - This results in the ICE running much more, sometimes even at idle when stopped. In this case the car will likely end up charging the battery vs. just maintaining the current level
2. Cabin heat needed in EV mode - If you don't have the heat pump option the car has the run the ICE to provide heat. The car probably uses the HSG to load the ICE to speed warmup and that ends up charging the battery
Neither case is what I would call "normal operations" and so most of us won't see it very often. In normal ECO mode you are exactly correct, the car will work to keep the current battery state of charge while driving. You may see a few miles more or less depending on the specific conditions, but overall the car will try to maintain the level.
I also agree it would be nice to have more detailed information available on the exact flow of energy in the system. But that's because I'm a
It would be interesting to do an experiment to test the second case. Pick a cold day with the battery say at half charge. Start the car and turn on the heat and just sit there. Does the battery charge increase?