SparkyJ wrote: ↑
Sat Jul 14, 2018 8:08 am
(Taken from pushev article comparing spark and bolt with lg chem cells)The Chevrolet Spark EV battery is made with 192 (2p96s) LG Chem cells, each cell is rated at 27 Ah and 3.75 V. This represents a total of 19.44 kwh
(192 x 27 Ah x 3.75 V). The battery volume is 135 L and the mass is 215 kg, this means an energy density of 144 Wh/L and 90 Wh/kg at the battery level, not cell.”
One thing to note, the energy display is not accurate very often. I finally got around to inputting the PID's in torque to read data and it reports 16.1kwh for the battery, I will keep an eye on that as well to see if it is accurate. The energy display can show anywhere from roughly 17.6 kwh to 16.2 kwh on any given day...way off IMO and not to be trusted. Hopefully the reporting from the torque app will be accurate. Also I would suspect the usable kwh from a new 2015 or 2016 spark ev to be around 17.4kwh, about 21k miles on my spark and at 16.1kwh, a bit sad as most of the time from the energy display I was calculating around 17 kwh more often than not. But I guess 16.1 isn't terrible as long as the degradation is slow. If 17.4 is the usable capacity, then losing 1.3 kwh from a battery in a spark sold over 3 years ago really shouldn't be frowned upon.
So 28,400 miles....14.8 kwh =1.3 kwh loss in a bit over a year. Seems fine considering I charge daily during the week on the 8a or occasionally 12a setting.
Btw I believe I figured out our 'new' usable capacity for 15' and 16's. Kind of right in our faces the whole time....you guys judge if it makes sense. Our sparks are rated at 82 miles new and whenever you reset the trip miles/kwh's it defaults to 4.4 miles per kwh...so 4.4 x 18.64 = 82. What does the 14's show....4.2miles per kwh? If so about 19.5 kwh usable, so each would have about 1kwh overhead according to the documentation we have.
For as many cycles my battery has had, just since I owned it. I think these packs hold up pretty good. Also worth noting, I still see 120kw power output down to about 35% soc, so no peak power loss.