General > General Technical Chat
Piles of Tesla owners stranded at charge stations abandons their EV's.
themadhippy:
--- Quote ---I don't think that's ever been the case? Those living in cold conditions would be using diesel specific to those conditions
--- End quote ---
Certainly was in the past here in the uk,but then we've never been geared up for the wrong type of weather,even our railways suffer with the wrong type of snow
Halcyon:
--- Quote from: themadhippy on January 16, 2024, 10:16:56 pm ---
--- Quote ---I don't think that's ever been the case? Those living in cold conditions would be using diesel specific to those conditions
--- End quote ---
Certainly was in the past here in the uk,but then we've never been geared up for the wrong type of weather,even our railways suffer with the wrong type of snow
--- End quote ---
Maybe the UK is the exception. But you guys claim it's a heatwave once it hits 30 degrees. We call it a warm summer's day. ;D
floobydust:
I looked at what went wrong in Chicago with the Tesla charging and it's not clear.
The company knows damn well what happened, they have the telemetry and should issue a press statement lest EV's get demonized for the wrong reasons.
I would expect a cold Tesla to refuse charging until the heater got the battery temps up, courtesy of the charger power, and then inititate charging at reduced rate.
But they would be really worried about battery Li-plating- which is terribly destructive to the batteries.
"Degradation of LiBs during operation is one of the most complicated and critical issues that involve the variety of electrochemical side reactions in all the LiB components. Lithium plating is one of the most important degradation mechanisms of the anode electrode. The main impact of lithium plating is severe capacity fade. It occurs under three main working conditions: low-temperature charging, high C-rate charging, and high SOC charging."
source: Progress in Energy and Combustion Science Lithium Plating Mechanism, Detection, and Mitigation in Lithium-Ion Batteries
Most of the unhappiness in Chicago, it appears due to the huge battery capacity temp derating, almost 1/10 capacity at low temps so the sudden range cut freaked people out. I haven't compared newer LiPO4 how they do.
People expected the usual 45 minute charge time, and while waiting for a charger station, things cool off. The battery is a stuctural component and imagine how much heater power/time it takes to heat a 1,000lb blob plus metal casing.
Diesel engines work fine here, there is a block and fuel heater but truck stops leave semi's idling constantly though. They never shut the engines off on big trucks.
pickle9000:
tom66:
--- Quote from: floobydust on January 16, 2024, 10:36:55 pm ---I looked at what went wrong in Chicago with the Tesla charging and it's not clear.
The company knows damn well what happened, they have the telemetry and should issue a press statement lest EV's get demonized for the wrong reasons.
I would expect a cold Tesla to refuse charging until the heater got the battery temps up, courtesy of the charger power, and then inititate charging at reduced rate.
--- End quote ---
This is pretty much what happens. The car will still drive okay (at very reduced power) if the battery is cold but charging isn't possible until the battery has warmed somewhat. Someone tested this, it took a good 45 minutes before their battery was hot enough to start accepting actual charging current.
It realistically isn't a problem until you get into -15C weather conditions, sustained for several days, and then get a lot of people who need to travel all at the same time, all without preheating their battery... perhaps because they know the supercharger is there and don't need the nav. But the problem is average people used to fuel powered cars don't necessarily get this. It's not necessarily an easy concept to explain. I mean it takes enough effort to explain to people it's faster to leave a supercharger at 60% than 90%...
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