JamieGeek
Well-Known Member
- Joined
- Dec 29, 2019
- Threads
- 82
- Messages
- 3,560
- Reaction score
- 6,752
- Location
- Southeastern Michigan
- Website
- spareelectrons.wordpress.com
- Vehicles
- Mach-E, old: Bolt, C-Max Energi, Focus Electric
I saw no battery degredation in my Focus electric. When I turned it in after 3 years and 30k miles it showed the same range/capacity as when I picked it up.I wonder if some of the EV engineers are beginning to realize that "saving the battery life" efforts might make the difference between 25 years or 20 years while staying above 80% of original capacity? That even 20 years for most people is well beyond their expected ownership horizon...
I know some early adopters, like the initial Leaf owners and many Energi owners (myself included) were disappointed by steep battery degradation. However, I believe the latest approaches to BMS software will help owners achieve significant longevity. For example, I have nearly 20k miles on my Kona, have seen no discernable battery degradation since the first month after the software adjusted to my driving habits and gave me a range of closer to 250 instead of 258 miles (I tend to drive quite "sporty" but I still get 3.8 to 4.1 mi/kWh on any given trip. My lifetime average is 4.0 mi/kWh, a theoretical range of 256 mi at that efficiency level. That is with A/C and ventilated seats on most of the time, cruise set at 70 or 75 most of the time, with passing spurts up to 85/90 mph.)
Note that the Ford Energi PHEV models did not have an active BMS; all they had was a simple fan in the battery compartment (if that).
The Focus Electric had an active BMS with cooling loops integrated into the rest of the heating/cooling system in the car.
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