How to measure a Battery's State of Health - Prof. Howey | Battery Podcast
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- Опубликовано: 20 сен 2024
- #BatterySOH #Degradation #Cycles
Before purchasing an #electric #vehicle, all eyes are on the #battery: Among first questions concerning #range #anxiety and #charging #speed, most people ask how much #loss of #capacity the battery will suffer over its average useful #life. In this podcast, we talk about (the very normal) #degradation of #batteries, #state #of #health (#SOH) measurements and the research of #predicting a battery's #lifetime.
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Our podcast guest for this episode is Prof. #David #Howey. He is a British Professor of #Engineering #Science at the #University of #Oxford and holds a Tutorial Fellow at St #Hilda’s #College. His research is focused on #modelling and #managing #energy #storage #systems, for #electric #vehicles as well as #grid and off-grid #power #systems.
Battery state of health (SOH) is a measurement that indicates the level of #degradation and remaining #capacity of the #battery. Expressed in a simple way, it describes the difference between the health of a new #battery and the #health of a used #battery. Typically, this is represented as a percentage of its initial #capacity and #performance.
According to Prof. Howey's expectations, most #EV #batteries are projected to last hundreds of #charging #cycles (most LiBs) without a noticeable loss in SOH. However, EV batteries do #age over time even if the battery isn't used at all.
Apparently, there are always minor losses in battery #capacity: Especially #fast #charging does #harm the #battery in case of a #bad #thermal #battery #management. At higher #temperatures, one of the effects on lithium-ion batteries' is greater #charging #performance & #lower #degradation. That's why many EVs heat their #batteries up before #charging them at #higher #speeds. In winter times, when temperatures are low outside, this can get quite #important when looking at a #high #life-#expectancy of an EV's #battery.
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0:34: 🔋 Understanding battery health and lifespan optimization with Professor Howey.
4:25: 🔋 Challenges in measuring battery health using models and limited parameters.
8:13: 🔋 Advancements in lithium-ion battery technology have led to improved performance and longer lifespan, especially for smartphones and electric cars.
12:14: 🔋 Factors contributing to battery degradation include SEI layer growth, particle cracking, and lithium plating.
16:09: ⚡ Factors affecting battery degradation: usage frequency, cyclic aging for daily drivers, and calendar aging for occasional users.
20:03: 🔋 Factors affecting battery capacity include algorithm changes, physical effects like ion stabilization, and potential capacity recovery over time.
24:01: ⚡ Effects of temperature on battery health and charging speed.
28:03: ⚡ Challenges in predicting battery life due to usage and population variability.
32:02: ⚡ Impact of variation in battery pack over time due to divergent behavior and limitations by the weakest link.
Recap by Tammy AI
Wow, thanks!
Great timing with the timing
can't see your title "measuring battery state of health"?
What an incredible Podcast concerning lifetime of a battery and parameters to determing the degradation.
Spectacular content, very useful insights by Prof. David, please keep future podcasts longer and allow the speaker to present more slides. Keep up the great work.
Thanks, will do!
That would be great if you could also have an uncut and uncut version i think some points weren't shown to the end
Hey there, Digitalwallis, thank you! We think Patrick should simply talk to Prof. Howey once more! We received great feedback emails already. Any questions for next time?
@@batterygeneration Sorry You asked for it
Is there a charge curve Temp vs Chargerate for LFP. What is the safe Rate for a LFP Pack with subzero Temps and whats the impact of Ytrium.?
Is there any Chance to recover a Battery capacity with some fancy charge discharge cycles?
Is there any other way to messure the SOC of a LFP as with Voltage, some spectral impendance Mesurement. May be the relation of Ri between two different Frequencies?
I mesured some effects in that direction but my tools in my Garage reach only 2GHz, it seam to happen at a higher Frequency.
My samsung zflip5 has battery protection mode on and limits the max charge to 80% and min charge to 30%, like my 2015 Tesla model S which has a similar charge cycle, the phone should last similar to my 9 year old car that can easily do 400kms on a 95% to 15% drive. 98% if the time my model S is charged to 70% and does not go below 30% before charging.
As someone dogging the hell out of my EV on ride shares, I'm testing out the theory that consuming energy between 70-30% range leads to less battery degradation (40 kWh on a Model S/about 124 miles usable range before recharging back to 70%) and using a total of 258 miles per day.
I'll post the results after 5 years.
Thanks for such a nice podcast. It would be nice to hear more about standalone battery (grid connected) application. The one-million pound question, life time Vs revenue. Usage in particular grid services Vs degradation and impact in projected revenue. It would be really interesting to hear more about Prof. Howey model and how it can be used in the industry for forecasting revenues.
Great suggestion!
The more that I hear about the very short life expectancy of modern phone batteries, the less I feel inclined to modernise my phone. It's ancient Nokia 6230i, and I have never had the need to use a phone for anything other than SMS and phone calls. (I use a tablet for more functionality.) That old Nokia is still on its first battery. Sure, it needs recharging a little more frequently, but it still runs for about 5 days per charge if I leave it running continuously.
I did buy a spare battery, years ago, when the phone became 'obsolete', but it showed significant degradation within about a year, so I returned to using the original battery. My conclusion is that battery durability is probably being sacrificed in pursuit of higher capacity in smaller cells, and in pursuit of lower manufacturing costs.
There can be a lot of variability in battery cells. I bought 2 electric toothbrushes. One battery (Panasonic cells) died after 2 years 1 month. The second one from the same pack is still working after 8 years.
What should telecom operators in sites areas where there are no public grid?
Nice discussion
Simple question, how do I measure the health of my EV battery
What EV do you have
@@stepanchenko Jaguar I Pace
@@mikejoseph425 sorry not familiar with that one but most of not all of them have a service mode you can access to do the battery degradation test. Try googling for those instructions.
I want to know about Lead acid batteries :(
Would you be willing to share the slide show that was occasionally shown in the video?
Nevermind I found it!
drive.google.com/file/d/1jGxoie5a0ukvlrg63n6AnTnT3uSq9VVD/view
I need a battery that can perform at -20C to 150C with a voltage curve mostly flat. My circuit runs for 20 minutes at low temperatures. Is there any way to correct this? I fire an actuator at the end of day two at 150 mas. Currently using CR2 batteries from Duracell and other. Failing at low temperatures.
Would like to know which chemistries prefer which charging strategies. Tesla says to charge their LFP packs to 100% but feel it's more so because of the flat voltage and therefore low confidence in predicting the SOC. Are they telling people to lower the pack longevity to improve the consumer experience? ie. flat battery @ 10 % and a tow truck..
I'm inclined to think so, yes. When the LFP batteries were first introduced in 2021, they didn't have the 100% charge recommendations and had a lot of users get stranded at 10% or 5% SOC. They realized that it was a BMS calibration issue where the car wasn't able to accurately predict the bottom of the pack. After a few weeks they introduced the 100% recommendation once per week, which seems like a compromise between battery longevity and BMS calibration accuracy.
subbed =]
When will this climate hysteria finally be over and when are we going to return to more sensible energy solutions again?