Every technology hits roadblocks and the story of how we solve those problems is as interesting as the technology itself. For the most part, I'll be focusing on battery technology. Energy is the the ability to do work, and the cheaper the energy, the more work we can do. With every new energy source, we change the face of humanity - wood, coal, oil.
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More interesting than I thought. 👍
great 🎉
Jordan handled Prof Howey like a pro, teasing out his deep knowledge and blending it together with his own knowledge to produce information that the rest of us as viewers can understand and maybe use. Excellent, and thank you, Jordan.
😊😊😊 Thanks for the kind words!
Project Redwood... cool selection since its his buddies company name... ya know... the recycle guy, that has every composite needed by Tesla to stamp their own 'Composite' body or even exoskeleton. Cool, later down the road I could 3d print repair parts from home.
Lithiun battery: Safe.. Charging time - 2 or 8 hours Low/high temperature may stop working
Sodium battery: Safest.. Charging time - 15 minutes Low/high temperature, fine
Good video, however you never mention cycle life. For me this is the most important advantage of LFP over nickel chemistry. Just found it strange that such an important factor was never mentioned.
That's because it's a chemistry level issue and I did an entire video on that
@@thelimitingfactor sorry I haven't watched that video. I still think it should be a factor in the overall rating. I appreciate your great content!
It is incredible that we have so many incredibly stupid people that drags the country down, yet we have a few gifted people like Professor Meng that are so gifted and talented that makes us all better for her hard work and accomplishments. Let's stop attacking the gifted and instead support them and enjoy all that give us to make the present and future great for all of us. Thank you, Professor Meng for being a part of the incredible brain trust that makes keeps the US relevant in a highly competitive world.
A bold statement, and a true one 😁
Great video. Im wondeeing if i should charge my phone to 100% once a quarter? It has been limited to 85% (now 80) for the last two years.
Aha! That's one battery cell rather than thousands, so it's a different story. No balancing is needed. It does probably need to calibrate, but I wouldn't know how often that needs to happen. Great question
Thinner steel can be hardshaped - the use of lasers is not necessary in this case. No rust must be a prerogative for a RoboTaxi that should operate as long is possible as a shell. Battery tech can be updated in the next 2/4 years all else can be updated.
Great interview, thank you. I have a question concerning a damage to a battery pack when the cells are out of balance 45:45. In the simple example of lots of cells in series, each unbalanced cell should have different internal resiatance. Thus, when passing a high current through the serie of such cells wouldn't there be an issue with uneven Joule heating? And thus greater degradation and unbalancing?
This video does a great job of explaining the challenges involved in knowing the state of charge for the different LI battery chemistries. Could you do an in-depth episode that explains what determines maximum charge and what happens to cells that are over-charged?
Great question! It's actually a product decision. When you overcharge, the cathode collapses. How much collapse and therefore degradation are you willing to accept? Most choose 4.2 volts for a nickel chem, for example, but you can charge it way past that - but be prepared to never use that battery again or have it explode.
@@thelimitingfactor I would think that even mild overcharging would cause plating and dendrite frormation. But, yes, overcharging until the cell explodes would make it a one use item. :D
Thanks a lot for this very informative video
This is so good, thanks for that talk!
Wonderful video man, really really appreciatd 👍🏼. Keep up the good work.
Probably a good thing Jordan wasn't interviewing Dr. Euan McTurk, another battery electrochemist, because he has a particularly strong Scottish accent which would send US watchers into a right tizz! 😁 But he's certainly worth following, he has his own channel and often talks in EV battery discussions and appears on panels at Fully Charged live shows.
Brilliant interview Jordan. I would love to see more content like this.
Excellent video. Apart from charging the Tesla Y to 100% for calibration, I would like to know what level I should drop the charge rate before recharging i.e. 30%, 50% ??
I wonder if the supply of electricity might be a significant constraint on the number of electric vehicles that can be built. EV owners are putting in solar systems in part tonotbe guilty of using grid electricity and pushing the prices up.
Her motherland now accounts for 95% of global Na-ion batteries production
The reason for large change in soc on parking is due to temp change of the pack. When it cools off it has less energy potential and the bms knows it.
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Really fabulous interview. Probably more useful information in 1 hour than any other battery or EV video I've ever seen. Amazing how Howey immediately grasps the crux of every question and already has the answer formulated in his head. But I have a question related to my own vintage EV. Is it deleterious to an LFP battery to have the voltage dip below 2.7 volts/cell in cold weather when the state of charge is say 30-40% and the only reason for low voltage is a high current load combined with the high internal resistance of the battery at low temperature? My Orion BMS sounds an alarm when this happens because even though it calculates an open circuit voltage, the alarm is based on the instantaneous voltage,
This video is phenomenal
Battery Doug Score. I'm all for it !
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Brilliant, thanks!
That’s why batteries charge so fast in the beginning but comparably very slow at the end
Great interview! One thing that is still not clear to me is whether the cells in a battery can only be balanced at 100% charge. It seems logical that a BMS would keep cell voltages the same throughout the charge cycle rather than only at the top end, especially given that a battery will usually have a buffer so it never charges to a true 100%. I would welcome any thoughts on this.
Listed to it twice now. I listed carefully to hear about REGENTERATIVE BRAKING. I always wondered how efficient regen is, given that the battery temp is managed for discharge when driving (not charging) when slowing down. Wouldn't his be a good application of a super capacitor? Treat it as charge first, discharge first. When decelerating or going down hill, first charge the capacitor with overflow going to the battery. The most likely event after deceleration is acceleration. The capacitor is there to give a burst of power, before the battery takes over. Since capacitors are very fast and efficient, more energy is saved. Correct me please?
Thanks so much! I was a physics major but I knew very little of this. Some time I would like someone to ask when new battery tech will improve phones, laptops, and power tools.
What a great interview! Fascinating! David obviously has a wealth of knowledge but also has that rare talent of being able to explain things in an easy to understand way. Also really enjoyed your interviewing skills Jordan. Quite excellent!
With batteries/packs I tend to think that: Unbalanced: When a cell (or cell-group) in series is out of step with the series voltage. This can cause cell damage at high currents as the (typically low voltage) unbalanced cell (or cell-group) can be reverse charged and destroyed. WRT state-of-charge for LFP: The pack is best fully discharged and the fully recharged to recalibrate the lower and upper bounds as well as pack capacity. Great content as usual, thank you.
Thanks for the support and the well-considered comment Clark! ✊🏼
One of your best videos. As an engineer I could have listened for hours. Thanks!
So glad to hear it! 😊
Thanks for the info. It was confusing if the information towards the end of the video related to just LFP or other battery chemistries also.
Thanks a lot! Many new things for me, explained on a nice level. And a nice choice on the factsheets/graphs to support the understanding.
Great interview, the flat curve is the main reason to why you need to wait util you are over 3.3V before you want to do the balancing on battery, if you try to balance midways it can easily be that they take energy from a 40%SoC cell and move it into a 70%SOC cell and make them even more out of balance. just because a cell at a lot higher SoC can still have a little lower voltage at that flat part of curve. This is very important to think about if you build DIY storage.
Interesting conversation. I typically don't have a need and have only charged my EV to 100% once, typically staying within 90%-10% range. It sound like that might not be best practice.
Depend on the chemical of your battery. What you should do is written in the owner manual, you should read it and follow its instructions.
Way over my head but I loved it. Thank you!
Great video. Unfortunately the audio from the professor made it really hard to understand.
15:30 min: Sodium-ion batteries generally do not have the problem of a wide voltage range. The positive electrode materials made of layered oxide for sodium-ion batteries do have this problem, that is true. But Prussian White analogues, for example, show a very flat voltage profile like LFP. So again, we have to be careful when generalising.
Nevertheless, great video
Good point of clarification! True, sodium ion batteries are not monolithic, just like lithium-ion batteries are not.
All those talks about "Tesla would release"... I've never seen anything go on schedule at Tesla. Musk has been promising Full self driving "Next year" each year since 2016...
I set my Ora Good Cat charging to 90% but every five or so charges the car charges to 100%.
Great stuff...for the most part....I think. I am old, I have my original ears, hence they are old. David's mic/sound, with a touch of that fabulous accent, left me struggling at times to string each syllable together. 😭 Also, don't be afraid to coach your interviews to over explain ( for your level) but explain it in a way that an 80 y/o with the mental capacity of a 6 y/o will understand. I noticed he back-peddled a few times, commenting that he knew you knew this or that. Great interview, enjoyable chemistry, in all regards!
If I want to ask Professor Howey a question about the large battery pack near Oxford. As I would like to see if they are rotating out older batteries in a similar to how commercial PV panels are rotated out when they cannot achieve peak efficiency. I ask because I live in Oxford and being able to buy good but used batteries is very interesting given I am going to be buying batteries in the next year or so. I thought I best ask here but I found a bunch of Oxford University youtube channels like Oxford Engineering or the non University channel; Oxford Sparks. Thank you for the inteview
Well done again. Great vid
Jordan, great job as usual. Would love a historical review of petrol development versus electric to dispel the FUD out there. Electric vehicles have been around basically as long as petrol, but had nothing like the funding petrol had and EVs faced technical limits that no amount of money would have likely fixed way back then. I am old enough to remember leaded gas and the early days of mass produced turbo charged engines that fried because of no real cooling management system so if you shut off the vehicle whole the turbo melted down. People who stared driving in the last few decades do not appreciate or realize how much petrol tech has changed and how mature of a tech it is. Battery tech alone has seen massive improvements in the past twenty years and reminds us battery tech is a much younger or less developed tech. This is why we see massive jumps in EV range and performance every five years or less. Those damning EV tech as a failure and something that will never work seem poorly informed and it would be nice to have a ten minute video that just lays out the facts. No politics, no hype, just laying out where things started and the reality of how EVs really are just hitting their stride and EV tech will have likely be the dominat force in all types of transportion before 2040. I see nothing from petrol or hydrogen tech that will make them the logical choice for transportation once EV tech and infrastructure is built out more. This is not question of if EVs are the near future, as in next ten years, best choice, but when in the next ten years will the EV tech hit the level of performance and cost that will draw most buyers in and gain public trust. Not that you need another project, but your delivery style and well thought out videos will likely be viewed by people on the fence about EVs who might be getting sucked in by the FUD pushed by some on media. It will be shared a ton by those wanting people to know the reality of EVs. Could be a good viral video.
Terrific interview ... I think I'm getting it !! Thanks
How often should we recalibrate our Tesla NMC?
I'm not sure what you mean by recalibrate Nickel based chemistries don't usually go out of balance as much as lfp I go months without charging to 100%
You have an excellent eye for finding where there may be gaps in understanding for us lay people and then crafting experiences where we can gain knowledge. So thankful for you and what you do!
It's really satisfying to hear that! I try 😁✊🏼