The battery of an electric car has the same capacity in winter as in summer

I think it's all the more important to take a closer look at the topic:

The battery capacity in winter is unchanged. But a cold battery is more inefficient than a warm one. This means that a cold battery produces more waste heat than a warm one and that is exactly why the range is lower in winter. When the battery is discharged, less electrical energy is released and more waste heat is generated, the colder the battery is.


The reason for this is the increasing internal resistance of the battery as the temperature drops.


Another reason for a lower range in winter is of course the heating. This can have a major impact on consumption and therefore range, particularly on short journeys. This phenomenon is becoming less and less a topic now, thanks to heat pumps. As they pump heat into the interior much more efficiently with the energy used.


Another reason for the decreasing range is the increasing air resistance the colder the air is. For example, if the temperature drops from 25 °C to 5 °C, the air resistance increases by almost 7% at 100 km/h because the air becomes 'thicker'. Of course, this applies to combustion engine cars as well as to electric cars.

Thanks to Prof. Dr. Benedikt Lagerstein, for this information.


But getting back to the battery temperature, this also means:

Once the battery is at temperature, the range is no longer as bad as with a cold battery. Of course, it still needs more energy than in summer to be kept at the right temperature by the battery heater. It is precisely this heating that ultimately saves more energy than it consumes, as the temperature-controlled battery works more efficiently.

This also means that the battery temperature can be better maintained on long distances, thanks to fast charging. While the car has to cool the battery in summer to remove access heat, in winter the car doesn't have to do that this much and can use this to passively worm up the battery to a certain degree.


This post was originally written for my personal Twitter and Linkedin accounts. I then published it here so it won't get lost in the depths of social media. I would also like to be able to see how my statements have aged in 10 years time.

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