I was wondering at what temperatures the battery is charged in wintertime. For example, is it just above the freezing point or much higher? The graphs below show it for some points during charging at a 50 kW rapid charger, for an outdoor temperature at the freezing point 0 °C. At the start of the charging the battery temperature was already between 10 and 15 °C because of the driving, but it still was increased in temperature to between 15 and 30 °C, which would not be very different from what you get in summertime. So, the Battery Conditioning System really works. A question remains what happens during normal or slow charging. Will the temperature even be increased more because of the longer duration? Or does the 'rapidness' of the charging contribute to the increase in temperature? These graphs are from this German forum, and the measurements make use of this and this.
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