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by CZeroOwner
Sun Dec 09, 2018 12:47 pm
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 37916

Re: Battery Capacity Testing

https://i.ibb.co/0tnrbFd/German-Data1.jpg The black dots in the graph above are battery capacities for 44 German owned iMiev/CZero/iOns collected by datom. There is a link in his post above. The green curve is my model (Ah = 50.4 -1.14*ln(km)) for battery aging discussed in an earlier post. It look...
by CZeroOwner
Tue Dec 04, 2018 1:04 pm
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 37916

Re: Battery Capacity Testing

datom's German data shows a much more drastic decline in capacity than I'm predicting. I seem to remember reading that a Li-ion battery can have a long period with constant capacity followed by a sudden decline. The German data supports this.
by CZeroOwner
Tue Dec 04, 2018 12:01 am
Forum: Batteries and Battery Management
Topic: Battery Capacity Testing
Replies: 65
Views: 37916

Re: Battery Capacity Testing

https://i.ibb.co/BKyFkC9/Capacity-Odometer-graph.jpg In an earlier post BlueLightning suggested measuring the fully charged battery capacity by comparing the change in kWh with the change in SoC while charging. I have done something similar using measurements of amps to the battery and the SoC coll...
by CZeroOwner
Thu Nov 29, 2018 9:41 am
Forum: Batteries and Battery Management
Topic: When and how the car adjusts its estimate of the battery capacity
Replies: 2
Views: 1893

Re: When and how the car adjusts its estimate of the battery capacity

I'm fairly sure that canion reports SoC 1 because it never exceeds 100%. SoC 2 does on occasion. EvBatMon reports both and so does OBDZero. I used OBDZero to collect the data.
by CZeroOwner
Thu Nov 29, 2018 7:58 am
Forum: Batteries and Battery Management
Topic: [Solved: Piev's Strange New Pack] Voltage vs SOC graph or table ?
Replies: 14
Views: 6445

Re: Pack Voltage versus SOC graph or table ?

If the charger charged the battery to more than 4,1 volts per cell then that would speed up battery aging.
by CZeroOwner
Thu Nov 29, 2018 4:46 am
Forum: Batteries and Battery Management
Topic: [Solved: Piev's Strange New Pack] Voltage vs SOC graph or table ?
Replies: 14
Views: 6445

Re: Pack Voltage versus SOC graph or table ?

https://i.ibb.co/XV1ZQmD/Voltage-So-C-1-amp.jpg Here is some data from my car. All of these measurements were recorded when the load on the battery was less than 1 amp. The spread is probably due to varying temperatures. Apparently a combination of 352 volts and 67 % SoC is possible. However 330 vo...
by CZeroOwner
Mon Nov 26, 2018 12:00 pm
Forum: Batteries and Battery Management
Topic: [Solved: Piev's Strange New Pack] Voltage vs SOC graph or table ?
Replies: 14
Views: 6445

Re: Pack Voltage versus SOC graph or table ?

https://i.ibb.co/YDdvTXR/So-CVoltage.jpg Here is a graph of Voltage as a function of SoC and current at 25oC. It’s based on lab data for a new LEV50 cell shown in the technical report “Development of a Large Sized Lithium Ion Cell “LEV50” and its Battery Module “LEV50-4” for Electric Vehicle” by Ki...
by CZeroOwner
Mon Nov 26, 2018 7:07 am
Forum: Batteries and Battery Management
Topic: When and how the car adjusts its estimate of the battery capacity
Replies: 2
Views: 1893

When and how the car adjusts its estimate of the battery capacity

https://i.ibb.co/tbkTGpV/Capacity-So-CSo-Cgraph.jpg Some days ago I recorded the data shown in the graph above. SoC 1 the red line is the state of charge we normally use. It is the first byte in the 374 PID. SoC 2, the green line, is the second byte in the 374 PID. Capacity, the blue line is the ca...

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