this post was submitted on 06 May 2026
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Mildly Interesting

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I could feel the heat coming off it when I stood next to the repaved section. They didn't repave the parking area at the edge. Opened to traffic again, seems firm enough to drive on at 160⁰F.

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[–] over_clox@lemmy.world 27 points 23 hours ago* (last edited 23 hours ago) (2 children)

Even though this article says that tire rubber starts to break down and melt between 100⁰C to 150⁰C, depending on the rubber compound, I'd still prefer to protect my tires from such high temperatures..

https://thetirereviews.com/is-it-true-tires-can-melt-because-of-heat/

Edit: Those temperatures are also rather dangerous for electric vehicle batteries, which are located right under the vehicle in very close proximity to the road heat.

[–] ThePantser@sh.itjust.works 13 points 23 hours ago (32 children)
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[–] varyingExpertise@feddit.org 4 points 19 hours ago (1 children)

Unless you have a Nissan Leaf or an UpMiiGo your battery has some sort of active cooling.

[–] over_clox@lemmy.world -4 points 18 hours ago (1 children)

I guess you don't understand active cooling then. If the coolest air in front of you is ~160⁰F, well that's the coolest your batteries are gonna get, at best. Which is way hotter than rated temperatures for lithium batteries...

[–] varyingExpertise@feddit.org 7 points 18 hours ago (2 children)

I'm not sure if you're being deliberately misleading. I'll just assume you've never owned a somewhat new-ish ev. None of those with active cooling use the outside air, almost as follow this kind of layout:

The circled part is the important one. Hell, even the first Gen ioniq which had an air cooled battery drew in chilled air from near the rear passenger ducts.

[–] piecat@lemmy.world 0 points 17 hours ago (2 children)

If the car isn't using outside air for cooling, where is the heat going?

[–] NightFantom@slrpnk.net 3 points 10 hours ago (1 children)
[–] piecat@lemmy.world 1 points 6 hours ago (3 children)

So, where does that heat go?

Last I checked, a fridge uses the outside air to cool the heat exchanger

Compressor heats up coolant, coolant exchanges heat with outside, cools down then evaporator cools it further, heat exchanges with cold loop then goes to be compressed again. It's the same principle that freezers and ac use, with the phase changes of the coolant you force them to move thermal energy in the desired direction.

[–] vaionko@sopuli.xyz 2 points 4 hours ago

Last I checked, my fridge works even when the room is warmer than the fridge.

[–] NightFantom@slrpnk.net 2 points 5 hours ago

Yes, and it cools stuff to cooler than the outside air, right?

[–] howrar@lemmy.ca 4 points 15 hours ago (1 children)

Based on the image they shared, the heat goes into the refrigerant, which then goes to a radiator to transfer into the outside air.

It doesn't use outside air in the sense that the battery doesn't transfer heat directly to the outside air. There's the refrigerant between the two.

[–] piecat@lemmy.world 1 points 6 hours ago (1 children)

Right, that's what I'm getting at. The heat indeed gets transfered to the outside air.

[–] howrar@lemmy.ca 2 points 5 hours ago

It makes more sense if you read the context. They're responding to a comment that said this:

I guess you don't understand active cooling then. If the coolest air in front of you is ~160⁰F, well that's the coolest your batteries are gonna get, at best. Which is way hotter than rated temperatures for lithium batteries...

A response that says "it's not X" can be interpreted as "it's not doing the thing you said it's doing". In this case, over_clox is saying that heat transfers directly from the battery to the air.

[–] over_clox@lemmy.world -4 points 18 hours ago (1 children)

Yuh, you ever tried to run an air cooler system, of any sort, with 160⁰F / 71⁰C as the input air temperature? That's how you overstress underrated systems and shit fails anyways.

[–] varyingExpertise@feddit.org 6 points 18 hours ago (1 children)

Where are you pulling these numbers from? I'm relatively sure you're just making some up by now until you hit one where any concept that has been explained to you will not work.

Contrarianism should not be entertained.

[–] over_clox@lemmy.world -3 points 18 hours ago (1 children)

Been there, experienced that, in my pocket no less.

https://safelith.com/temperature-limits-for-safe-lithium-ion-battery-usage/

Matter of fact, we got a phone battery on order to replace a spicy pillow. I should go check the mail now..

[–] glibg10b@lemmy.zip 4 points 13 hours ago (1 children)

Could you share more details about the active cooling system for your particular phone?

[–] over_clox@lemmy.world -3 points 13 hours ago

Yes. Heat rises. And the device should never get that hot.