MickeyAO
Well-known member
- First Name
- Mickey
- Joined
- Apr 2, 2020
- Threads
- 26
- Messages
- 1,052
- Reaction score
- 2,104
- Location
- San Antonio Tx
- Vehicles
- Rapid Red Lightning Lariat ER, Kia EV6 GT-Line AWD
- Occupation
- Retired Lab Manager of the Energy Storage Technology Center
You are correct. If you know the number of cells and the configuration of the pack, you can calculate the actual capacity of the pack.So this is probably a separate discussion, but it seems most all manufacturers are building a buffer into the battery pack. You see a lot of specs stating X kWh total with X kWh usable.
With that in mind, when the vehicle itself shows a charge of 100% that isnt really 100% soc for the battery pack, it's maybe only 90%. And if this is the case one would imagine that you could do the math and figure out that charging to 85 or 90 indicated is actually 80% of the total pack capacity.
Maybe I'm just way off here, but I was thinking that was the intention behind building so much excess capacity into the pack. So you could charge to 100% indicated and be actually going to a lower soc and doing less damage to the cells.
Using a previous SK Innovation pack (kind of narrows the field) I have tested as an example, I calculated that the manufacturer was derating the pack by about 50% of actual capacity. That information along with a couple of items I discovered inside the pack lead me to believe that they were scared of the cells. Several years later when they released the updated model of the vehicle, the range almost doubled with no changes to the pack configuration.
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