So, even the 2011 has a modest heater, then ? I believe you. However,
how do you explain the vast difference between range (kWh during
charging) in winter 20F versus comfortable weather 70F ?
Peri
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------ Original Message ------
From: "Cor van de Water via EV" <ev@lists.evdl.org>
To: "Electric Vehicle Discussion List" <ev@lists.evdl.org>
Cc: "Cor van de Water" <cor.vandewa...@gmail.com>
Sent: 05-Apr-22 18:47:53
Subject: Re: [EVDL] kWh versus charging temperature
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
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