Every battery I have taken apart that has heaters, has a total of 6: 2 on top of the halfpack, 2 midway between the quarterback stacks and 2 in the front of the battery, next to the first high stack of the quarter packs. The resistance is in the order of 10kOhm and all heaters are in parallel, connecting to the full battery voltage when the heater relay closes. At an average 375-ish Voltage, the current is around 37mA which translates into a max heating power of around 12W per heater. Each heater is built up with a plastic carrier, a thin alu sheet het spreader and all have the same resistive heating element, though the resistance is strongly temp related. At room temp I measured about 8.7 kOhm, but even putting my hand on the heater element the meter quickly rose to near 10kOhm, so at any decent heat produced the resistance is likely to rise sharply and the power to fall, so they intrinsically avoid thermal runaway. The power likely falls to around 7 Watts per heater in operation, so about 40 Watts total for a pack. but a cold pack may start at more than 100W of power draw for heating. Cor.
On Mon, Apr 4, 2022 at 3:31 AM Jay Summet via EV <ev@lists.evdl.org> wrote: > > > > On 4/4/22 00:54, Peri Hartman via EV wrote: > > I'm not sure about the newer models, but definitely no battery heater > > (or cooler) for the 2011 model. > > > > 2013 Leaf has (four) resistance heaters inside the main battery case. > They turn on if the temp gets below freezing. > > No active cooling in any Leaf battery so far. > > Jay > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/ > LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
