paul dove via EV wrote:
You are leaving out the self heating inside a battery under load
Self-heating helps; but it's not much unless you are discharging the batteries pretty quickly (like a full discharge in less than an hour). The heat from internal resistance is proportional to I^2R, so high currents greatly increase the heating.
Of course, all this assumes you *want* to heat the pack. You can also have the reverse problem; excessive heating in summer. That's bad for battery life.
A well designed EV will have a thermal management system (both heating *and* cooling). When manufacturers don't know any better and/or "cheap out" and try to get by without one, they create problems for their customers.
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