Nubo
Well-known member
surfingslovak said:...
I never believed in any threshold temperature or hockey-stick acceleration of battery degradation at higher temperatures. To me these are chemical processes, which run faster at a higher temperature and slower at a lower temperature. The aging velocity is an aggregate process, and overall battery degradation is the cumulative result of all the changes that took place in the battery. Please keep in mind that these things are analog beasts, not digital. Degradation is not subject to some sharply defined thresholds. It happens all the time, the only thing that varies is the speed...
An oversimplification. There are multiple reactions going on in a battery. The favorable ones are reversible (charge/discharge), the unfavorable ones are not. Many reactions have a threshold energy and rate vs. temp is not necessarily a straight line. Google image search "reaction rate vs. temperature" and you'll see every shape of curve imaginable. Also there are physical changes to the cathode/anode material, plating of metals, etc... I would not assume that any of these progress linearly with temperature. The battery designers are always after better magic that will move the regimes of the unfavorable reactions outside of the expected operating range. They are very deliberately creating "hockey sticks".
However, if your assumptions fit the data you have collected, then maybe that's good enough.