| Author | Message | ||
     Gregtonn |
Anybody notice the EV issues due to the cold snap? Not a problem here since highs have been well above freezing and because I don't own nor do I ever intend to own one. Anyone care guess how many individual cells there are in some Tesla Model S batteries? G | ||
| Aesquire |
https://www.powerlineblog.com/archives/2023/01/the -extinction-next-time.php The boy who cried wolf and made a small fortune. Anyone care guess how many individual cells there are in some Tesla Model S batteries? Far less than the Mercedes AAA class! the Model S P85’s battery pack has a capacity of 90 kWh and weighs over 530 kgs. It contains 16 modules, which are 7104, 18650 cells. The battery pack has a central bus bar that connects each battery module with a contactor that feeds both the front and rear electric motors. Since each module is 5.5 kWh and we have 16 of those in a 90KWh Tesla battery. Thus making it an 84kWh module. https://circuitdigest.com/article/tesla-model-s-ba ttery-system-an-engineers-perspectiver The next generation will use larger physical size cells with a more robust crimp design, and the cast aluminum chassis/battery tray will be a heat sink/transfer plate. Basically a giant sheet cake pan, with batteries packed, oriented vertically, and epoxy poured into the gaps to make a solid structural slab you bolt the suspension and body to. | ||
| Aesquire |
https://www.powerlineblog.com/archives/2023/01/a-d ose-of-sanity.php | ||
| Hootowl |
The S and X models will likely never get those cells nor the structural battery backs. Tesla considers them legacy models. The structural packs are designed to accept the one piece casting that make up the front and rear sections of the vehicles. They would have to completely reengineer the S and X models to make that happen. Tesla’s future is in the model Y and 3. | ||
| Gregtonn |
Each one of those 18,650 cells has the potential to be a single point of failure that can lead to thermal runaway which can lead to igniting the other 18,649 cells. This video does a fair job of explaining the physics of it: https://www.youtube.com/watch?v=K5vDWhMHTwE&ab_cha nnel=DonutMedia G | ||
| Hootowl |
They are each individually fused to the bus. In theory, a runaway cell will pop that fuse before getting hot enough to be a problem. In theory.  | ||
| Ratbuell |
Buss. Just to be clear. | ||
| Gregtonn |
Fuses are activated by over current conditions. If the runaway is due to an internal short, separating it from the bus will do nothing to solve the problem. About 24 seconds into the video you can see what happens when he forces an internal short in a single cell. Something as simple as a minor flaw in the dielectric sheet separating the electrodes could cause such a short. Such a flaw could go undetected until the cell is stressed to near the high end of its design limits. G | ||
| Gregtonn |
Clearly I meant buss. When I was designing satellites I had a boss who would have preffered to have been an English Professor. He would make copies of memos and presentations so he could redline them for grammar and spelling errors. You may have noticed a grammatical error in my original post. G | ||
| Hootowl |
Yes, buss, sorry. Direct a blow torch at a gas tank and see what happens.  The fuse prevents the overcurrent condition that would lead to the level of heat necessary to pop the cell. And since there are no blow torches built into the battery, battery fires are rare (compared to gas powered vehicles) and are typically the result of physical damage, not spontaneous battery failure. Exceptions can and do occur. | ||
| Gregtonn |
And since there are no blow torches built into the battery, battery fires are rare (compared to gas powered vehicles) and are typically the result of physical damage, not spontaneous battery failure. I wasn't referring to the blow torch scene, however if you look at the forced short I did refer to you can see there is a "blow torch" built in to each cell. G | ||
| Hootowl |
The blow torch built into each cell doesn’t generally light itself; there has to be a trigger. That trigger is usually physical damage, not runaway current. Runaway current is ameliorated by the fuse. On a per mile basis, gas cars are far more likely to catch fire than electric cars in general, and Teslas specifically. I get that you don’t want to own one, and I will never be an advocate for forced purchases. Buy what you want. I did, and I would do it again. My model 3 has been the best car I’ve ever owned, a close second being my diesel Jetta, which I still own, and drive regularly. | ||
| Hootowl |
Also, one of the safest cars ever made. 5 stars in every category. Unheard of for an SUV. https://www.foxnews.com/us/california-crash-leaves -four-people-injured-tesla-plunges-cliff-devils-sl ide Fell off a cliff. The children were unharmed. Not a plug (no pun intended) for electric cars, just a note about the safety engineering Tesla excels at. A commonality between my two cars is the safety rating. My jetta has ten airbags. | ||
| Hootowl |
Oh. And did not blow up. | ||
| Aesquire |
I loved my Sportwagen TDI. Got my money's worth out of it when I had to commute to Pittsburg from Rochester for two weeks. 10 round trips. Great handling car. Comfy, quiet, great torque. Love, love loved the dual clutch transmission. Spoiled me. Give me that drivetrain in a minivan! The NHTSA says I have the car most likely to have a fire after an accident. Hybrid. Both gas and battery. There's not enough time for a decent study on the electric cars. Can there be a spontaneous fire in an electric car? Sure. Pretty rare if you buy quality, but certainly possible. But there's a reason insurance costs less on a separate garage than one attached to the house. Long before modern electric cars. High density energy storage has hazards. Period. Gasoline is dangerous. I would not buy a GM. Allegedly there's a problem with the LG made cells. When I buy an electric motor for my bicycle, I'll avoid LG. ( current options for most battery packs are Panasonic, Samsung, LG, & generic Chinese ) I recall Samsung had a problem with Chinese made batteries, poor QC, and a disgruntled employee problem. Treat your employees like slaves and don't expect them to care. They fixed the problem. And the guy I know who built his own custom battery packs for his little airplane, charges them at home in his fireplace. Just in case. I charge my tricycle in the kitchen. I don't leave them on charge overnight or when I'm not home. I will buy a grill pad, the thing you put under your grill if you BBQ on a wooden deck, for it next time I'm at the farm store. I'm a safety nut, but I'm not paranoid about it. I made my car choice based on multiple factors that don't necessarily apply to anyone else. I don't have indoor parking, so I don't want to plug my car in outdoors. I don't worry about range any more, or less, than I did a decade ago. After a year, I'm happy with the Rav-4 hybrid. I love the planetary gear transmission. My only complaints come from MY OWN ignorance on details like tire pressure sensors, Toyota uses only a few of the frequencies so I blew over $200 on sensors that don't talk to my car. I'm still working on the problem, but I think I'm screwed. I bought rims and Sumitomo studded tires, so I could save the $200 a year on tire changes, and not beat up the mag wheels. Now, for the next 3 months, my car is loud and there's a cute polar bear sticker over the warning light. I'll talk to the garage again this week. Life was simpler when my cars had carbs and my only computer was a 486. But I do enjoy radar cruise control, being able to look up weather and GPS maps on my tablet or phone, and so it goes. | ||
| Aesquire |
https://hotair.com/john-s-2/2023/01/02/last-genera tion-extinction-rebellion-tactics-of-blocking-traf fic-spread-to-germany-n521021 Heard from a Swede that he now carries a can of preserved fish in his car to give to ( put next to ) protesters who glue themselves to the road. I can't pronounce or remember how to spell it. But I'm assured it's pungent. Dog runs away in terror pungent. I could wax poetic about self aggrandizing cultists, but it's rude to pick on the mentally ill, and there's a Lot of them. | ||
| Hootowl |
I believe he was talking about rakfisk. Salted, then fermented up to a year. | ||
| Aesquire |
I've had lutefisk. Fish dried, preserved with lye. You soak the rock hard slabs in milk or water for days, changing fluid daily, to make a preserved fish you can hammer nails with, and survive on an open Viking ship in the North Atlantic, into a gooey translucent object that may be illegal to bury in most states under environmental impact rules. It smells like ambrosia compared to the fermented stuff. Iirc on Alton Brown's motorcycle & food trip show, they tried lutefisk and it made his French producer run into the bushes to get... Rid of it. I would NOT keep canned, fermented, fish in MY car. It gets warm here sometimes and I'd hate to have my car burn. ( to save the neighborhood! ) | ||
| Aesquire |
https://lawliberty.org/book-review/chipperdammerun g/ Probably belongs in the Biden* thread since it's his script writer's policies criticized. | ||
| Aesquire |
https://www.popsci.com/science/roman-space-telesco pe-spy-satellite/ To give you a sense of just how surreal this is, imagine all of the time, money, and engineering that went into designing and launching the JWST. Now imagine that a spy agency not only had two more JWST-class instruments, but didn’t even need them anymore. Link will be behind paywall soon. | ||
| Two_seasons |
What is the #1 Greenhouse Gas? What percentage of 100% does it represent? Water Vapor, 79% How do you contain that?  For that matter, how do you put a cork in a volcano? | ||
| Hootowl |
Easy. It almost immediately catches fire, though.  | ||
| Aesquire |
No one has tried corking a volcano with Congresscritters & it's worth a try. Opposite of Virgins. | ||
| Hootowl |
It is illegal to dump toxic waste anywhere you might find a volcano. State parks, national forests, national monuments, etc. Best to visit your local recycling center if you have a politician you need to get rid of. Be prepared to pay a small fee. | ||
| Aesquire |
Doubt I can afford it if they charge by weight. In less happy news. A decent explanation for a Possible cause to an ongoing tragedy. https://www.nationalreview.com/the-morning-jolt/nf l-shaken-by-damar-hamlin-collapse/ | ||
| Court |
Happy with the EV so far. Does some things well, others less so.. | ||
| Aesquire |
https://wattsupwiththat.com/2023/01/03/the-pied-pi per-has-no-clothes/ | ||
| Aesquire |
https://pjmedia.com/vodkapundit/2023/01/03/insanit y-wrap-eugenics-experts-advise-having-sex-with-sho rt-people-n1658091 | ||
| Aesquire |
https://hotair.com/tree-hugging-sister/2023/01/03/ remember-that-nice-british-chimpanzee-lady-i-think -she-wants-us-dead-n521212 Basically a group of Bond movie, or Tom Clancy supervillains. In Rainbow Six, it was super rich environmentalists planning to slaughter the planet with an unstoppable plague, while they hid in a South American jungle lair. You know, to save The Earth. The WEF is the real deal. Promising a rental utopia with themselves as universal landlords. they consider your life as a subscription service, mandatory company store indebtedness and Social Score permission control. The owners of the boot on your face, forever. | ||
| Hootowl |
As a vertically challenged person, I welcome the idea |
