3 ms·

Also I believe LFP chemistry is friendlier to staying pegged at 100% SoC.

• cogman10 3y ago
  Not really, it just has such a long cycle life that staying at 100% means a lot less. The reason manufactures like you to charge to 100% semi-frequently is because LFPs have a fairly flat voltage curve. There's not a lot of difference in voltage between 20% and 80% which means predicting how full the battery is can be tricky for the charge controller. (nothing worse than seeing your car go from 40% to 17% in a heart beat because the controller was off). Charging the car to 100% is the best way to calibrate the charge controller.
  • nimish 3y ago
    Haven't they switched to coulomb counting? No need to infer state of charge from voltage alone.
    • Kirby64 3y ago
      Coulomb counting has issues with accumulated error in any system. LFPs just make things worse. Consider that if the counting is off by only 0.1%, then if you only use coulomb counting to determine state of charge, you will accumulate a 10% error after only 50 charge and discharge cycles. Voltage based readings to "reset" or calibrate the maximum/minimum set points are extremely important. For LFP batteries, they need to be very close to the 100% state of charge to accurately measure. Regular lithium ion can be measured at much lower states or charge (70-90% usually, to my knowledge).