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Discussion Starter #1
Minus 6 this morning which made me ponder about adding some battery heating! Has anyone tried? I can see that adding high power heaters close to Lithium batteries can be a safety issue; I was thinking more of some low wattage large area heaters, over a large percentage of the bottom of the battery. Even if it kept the battery from cooling too much (say below 10C) it would be a range advantage.

Alternatively, is there any way of triggering the built-in heaters that are supposed to come on at -15C?
 

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If you finish charging at the time you are leaving then won't the batteries be warm anyway?

I did read that colder markets (or older models) are equipped with battery heating but can't seem to find any references now; surely places like Norway have something or do they rely on always plugging in when parking similarly to ICE cars?
 

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Discussion Starter #3
If you finish charging at the time you are leaving then won't the batteries be warm anyway?

I did read that colder markets (or older models) are equipped with battery heating but can't seem to find any references now; surely places like Norway have something or do they rely on always plugging in when parking similarly to ICE cars?
Maybe if I'd rapid-charged then yes, the battery would be warm.

Using 3.6kW charging at home these are the temperatures from leafspy-
Yesterday: 6C morning (after charging),
7C after commute,
parked in direct sun. 4.5C on starting drive home,
7C arriving home
This morning: 4C after charging, 5.5C after commute

Luckily this cold snap in the UK won't last long, but yes it would be interesting to hear how folks cope in really cold weather!
 

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I can confirm that the second gen UK cars do not have battery heating but do have connections for it within the battery pack.

Gen1 packs seem to be hit and miss on if they have heating or not.

Mike
 

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Maybe some kind of warm stone could be put under the car at night to keep the battery warm. I'm also thinking some kind of lightbulb system along with curtains at the side to keep the warmth in.
 

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Discussion Starter #8
Garaging would be good- but the Leaf is surprisingly big for my '60s garage!
I'm wondering if some insulation added for the winter months would be useful to keep the heat in overnight. Of course it would need to cope with getting wet.
 

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Maybe if I'd rapid-charged then yes, the battery would be warm.

Using 3.6kW charging at home these are the temperatures from leafspy-
Yesterday: 6C morning (after charging),
7C after commute,
parked in direct sun. 4.5C on starting drive home,
7C arriving home
This morning: 4C after charging, 5.5C after commute

Luckily this cold snap in the UK won't last long, but yes it would be interesting to hear how folks cope in really cold weather!
In your case surely heaters would be limited use? By the time you drive home any temperature would have been lost.

If you used the traction battery for some low wattage, large area heaters I suspect the effect on range would be negative (energy used for heating would exceed the extra energy liberated from the battery).

If it used mains electric it may be handy if you were going on a 80+ miles journey....but otherwise pretty pointless.
 

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Minus 6 this morning which made me ponder about adding some battery heating! Has anyone tried? I can see that adding high power heaters close to Lithium batteries can be a safety issue; I was thinking more of some low wattage large area heaters, over a large percentage of the bottom of the battery. Even if it kept the battery from cooling too much (say below 10C) it would be a range advantage.

Alternatively, is there any way of triggering the built-in heaters that are supposed to come on at -15C?
Heaters would consume way more kWh than what you would get back in range from heating them.. best move.. park it in the garage over night and 6kw charge just before your depart (as well as preheat)
 

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Discussion Starter #12
Heaters would consume way more kWh than what you would get back in range from heating them.. best move.. park it in the garage over night and 6kw charge just before your depart (as well as preheat)
That's fine if you have a garage and 6kw charging! I'm thinking along the lines of a way to keep the battery above 10 or 15 c, to keep decent capacity. This could be a winter blanket or an active system, eg 240v heating, for the coldest weather.
 

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I was speaking to a chap from the Bentley drivers club. He said to keep the oil warm in he old bentleys they use an inspection light with a traditional bulb under the car over night. I wonder if this would work for the leaf. Probably need a garage.
 

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My car sits out on the drive but if I had an empty garage [I've always regarded a garage with a car in it as a garage wasted] then I think, rather than try to heat the battery then use a large slab of polystyrene foam jammed under the battery as an insulator to keep the heat generated on charging from escaping. Warm battery, better range, money saved will pay for the insulation.
 

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Also in the UK!

I guess we just have to live with it - it's rare for the temperature to drop much lower than -5C for more than a couple of nights, so the car is operating within Nissan's specified parameters.
 

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Discussion Starter #16
I can confirm that the second gen UK cars do not have battery heating but do have connections for it within the battery pack.

Gen1 packs seem to be hit and miss on if they have heating or not.

Mike
Mike, you're more familiar than most with the Leaf battery - what does the underside of the battery box look like? Would it be flat enough in places to stick on some silicone heater pads like these?
15X1000mm,[email protected], Keenovo Univeral Silicone Heater Strip, Pipe Heating Belt | eBay

I'm thinking heating when plugged-in, overnight/on a timer. Clearly some temperature control would be essential, set to 25C perhaps. I'd hope the steel box would act as a heat spreader. Some insulation outside the heaters and blocking up of the "air intakes" that already exist may stop it cooling too fast driving on the coldest days.
I think the boost in range could be well worthwhile especially as the batteries age. You'd reduce the depth of discharge. Depends on the use case, of course but I'd rather get home with 25% than 5% :)
 

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Mike, you're more familiar than most with the Leaf battery - what does the underside of the battery box look like? Would it be flat enough in places to stick on some silicone heater pads like these?
15X1000mm,[email protected], Keenovo Univeral Silicone Heater Strip, Pipe Heating Belt | eBay

I'm thinking heating when plugged-in, overnight/on a timer. Clearly some temperature control would be essential, set to 25C perhaps. I'd hope the steel box would act as a heat spreader. Some insulation outside the heaters and blocking up of the "air intakes" that already exist may stop it cooling too fast driving on the coldest days.
I think the boost in range could be well worthwhile especially as the batteries age. You'd reduce the depth of discharge. Depends on the use case, of course but I'd rather get home with 25% than 5% :)
Pretty flat. But there is some plastic 'belly' trim atttached directly to it.

Sent from my SM-N9005 using Tapatalk
 

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Discussion Starter #18
Pretty flat. But there is some plastic 'belly' trim atttached directly to it.

Sent from my SM-N9005 using Tapatalk
I've got as far as looking at the belly trim - don't suppose there's much, if any, room between that trim and the battery case itself. I'd guess the batteries are not sitting directly on the metal case, is there much there in the way of thermal insulation?
 

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No insulation whatsoever. I'll get some pictures from some casings....

Sent from my SM-N9005 using Tapatalk
 

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Heater pads from a us spec battery.

Sent from my SM-N9005 using Tapatalk
 
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