Re:Helixx: $6 a day EV subscription service could disrupt th...
by Koemul on Sunday April 07, 2024 @11:32AM
(#39961425)
Just a note regarding battery longevity:
LFP batteries like in the Helixx can be charged 0-100% with hardly any impact on battery lifetime [1].
Even NCM or NCA batteries can be charged 1-100%, because the battery management system doesn't actually fully charge or discharge the battery, even if the car shows zero or 100% charge. However, 20-80% or 10-90% charging does increase live time.
[1] https://iopscience.iop.org/article/10.1149/1945-7111/abae37/...
Page 6, Figure 3, graphs 'd' shows the number of cycles until the battery can only hold 80% of a charge for LFP, NCM, and NCA batteries. Note that electric cars have a battery management to prevent the most damaging situations in those graphs (too hot/cold, full charge/discharge, too fast, etc.).
Even NCM or NCA batteries can be charged 1-100%, because the battery management system doesn't actually fully charge or discharge the battery, even if the car shows zero or 100% charge. However, 20-80% or 10-90% charging does increase live time.
[1] https://iopscience.iop.org/article/10.1149/1945-7111/abae37/... Page 6, Figure 3, graphs 'd' shows the number of cycles until the battery can only hold 80% of a charge for LFP, NCM, and NCA batteries. Note that electric cars have a battery management to prevent the most damaging situations in those graphs (too hot/cold, full charge/discharge, too fast, etc.).