4 ms·

I have actually worked on a battery system, but still have problems understanding wrapping my head around how the temperature dependance works. Do (Li-ion) bat

I have actually worked on a battery system, but still have problems understanding wrapping my head around how the temperature dependance works. Do (Li-ion) batteries store less charge (Coulombs) when charging cold? Or is it when discharging cold, they convert some of the energy to waste heat? Or do the same charges translate to less energy (e.g. less voltage difference at same current) when the battery is discharged cold? Maybe someone can give a good explanation, I found it hard to get a straigt answer :-)

raxxorrax 5y ago
It is in general the reaction speed which results in a lower voltage. But I believe the exact reason is poorly understood. Seems to affect all batteries and lithium-ion batteries are no exception. Most people I know report that their formerly 350km vehicles only drive 250km if it is really cold outside. Of course you also have heating withing the cabin that is not an insignificant factor. So cars perform worse, but they don't completely break down. Although I had it happen with a company car once when it was very cold outside. Display told me to stop as soon as I can. I did so and the car went completely dead. Left it there, the next day was considerably warmer and the car worked normally again.