2017 - 2021 Prius Prime - 8.79kWh Battery Deep Dive

Grab some more snacks and get ready for the first KZbin video showing the complete reassembly of a Toyota Prius Prime Battery!
TIMELINE:
0:00 Video introduction
1:40 Battery heater overview
3:15 MUST SEE - Closeup of heater grid
7:50 Battery heater installation
9:31 Battery cell stack specifications
11:35 MUST SEE - OSHA and NFPA 70E safety requirements
13:15 Battery cell stack voltage
14:30 Battery cell stack weight
16:50 Battery cell stack dimensions
18:03 Battery cell stack interconnections and monitoring circuits
22:20 Battery cell stack venting
23:00 Battery cell stack cooling
26:30 MUST SEE - DANGER: Battery cell stack disassembly
31:45 MUST SEE - Battery stack to battery stack series connections
33:52 High voltage fuse function
35:45 Service disconnect lever function
37:46 Battery ECU function
38:25 Battery negative junction block function
42:20 Battery positive junction block function
43:00 Charger fuse
45:54 Battery cell stack installation
51:40 Low voltage wiring harness installation
52:50 Vent tube manifold, exhaust duct, and vent inlets installation
55:57 MUST SEE - LIQUID WARNING
57:40 Temperature sensor connections
58:46 Heater connections
59:45 Cell voltage monitoring harnesses
1:01:07 High voltage series connections
1:01:30 Battery frames installation
1:01:57 High voltage fuse installation
1:02:08 Battery ECU installation and connections
1:04:13 Battery junction block #1 (Negative) installation
1:04:23 Battery junction block #2 (Positive) installation
1:05:06 Service plug grip disconnect lever connector installation
1:06:10 Battery heater relay installation
1:06:25 Low voltage connections
1:09:23 Battery cover upper installation
1:09:51 Battery shield cover installation
1:12:55 Battery weight measurement
1:14:28 Video review
ABOUT US:
Weber State University (WSU) - Department of Automotive Technology - Ardell Brown Technology Wing - Transmission Lab. 2017 Toyota Prius Prime (Plug-In) PHEV 351.5V 8.79kWh 25Ah Li-Ion Battery Deep Dive - A KZbin first! The system is protected by a 125A fuse. This is the second in a series of videos on the Toyota Prius Prime. This episode covers the complete reassembly of the 8.79kWh 351.5 Volt 25 Ah air-cooled battery from a 2017 Toyota Prius Prime PHEV. The Prius Prime battery is rated at 25Ah and its voltage is 351.5V, so its kWh rating is 25Ah x 351.5V = 8787.5 Wh or 8.7875 kWh.
W.S.U is a leader in Hybrid and Electric Vehicle education. This topic is taught as part of our 4-year bachelor's degree program. For information on joining the Weber Automotive program, visit: www.weber.edu/automotive
This video helps cover content related to the 2017 National Automotive Technicians Education Foundation (NATEF) Master Automobile Service Technology (MAST) Standard task 1.A.9 "Identify service precautions related to service of the internal combustion engine of a hybrid vehicle."
This video was created and edited by Professor John D. Kelly at WSU. For a full biography, see www.weber.edu/automotive/J_Kel...
Questions for Teachers:
1. What is the purpose of the battery heater?
2. Under what conditions will the battery heater activate?
3. What is a battery stack?
4. What is the stack voltage?
5. How many battery stacks are in this battery?
6. How are the stacks wired (Series or parallel)?
7. How are the stacks cooled?
8. How are the stacks vented?
9. What is the amperage rating of the battery fuse?
10. How are battery cell voltages monitored?
11. What is the function of the negative contactor?
12. What is the function of the positive contactor?
13. How many temperature sensors are in this battery?
14. What is the concern with carrying liquids in the hatch area?
15. How much does this battery weigh?
ADDITIONAL TRAINING FOR YOU
Join us for hybrid and electric vehicle training with two online courses and in a 5-day on-campus boot camp with Professor John D. Kelly. See www.weber.edu/evtraining
DONATE TO OUR DEPARTMENT
Please consider a donation to the Department of Automotive Technology at Weber State University here: advancement.weber.edu/Automotive

[@Pedrop-vq3ys]

Uploading this videos you really help and encourage people to learn, specially technicians like me from countries where this kind of training and information is almost impossible to get. I love your videos professor. Thanks

[@gangpw924]

great video thank You, my 2018 Prime, 869 miles so far, halfway through my 1st tank , the daily EV commute experience is amazing

[@WeberAuto]

Thank you, the EV experience is very addictive. Have a great day!

[@andreaskainz217]

Dear professor! Thank you very much for your work and the time you put into the transfer of knowledge. I have seen several of your videos several times and am always learning. I hope to see them in the future when they report on new technologies.

[@glenngoodale1709]

Thank you Professor John Kelly for your great teaching !! You really have a gift for it. I need to watch it again, before I take the test ...

[@WeberAuto]

Thank you very much!

[@rahhal83]

It's look like the old prius plug in

[@WeberAuto]

The old one had a separate battery for hybrid mode

[@asliasif1]

Absolutely brilliant, i just can't thank you enough for making that video sir. I am on my way to become a mechanic but one thing is for sure that i have not learnt any thing about hybrid in last 4 years but in few hours from your videos. I appreciate it so much. Thanks a lot sir

[@WeberAuto]

Thank you very much

[@John-ny6yy]

That was one of the best instructional videos that I have ever seen. Great job Prof on your clarity and data. So much amazing tech built into these new li-on battery packs. There are so many people that drive them and dont realize how much is going on in the battery system. Amazing engineering hands down..

[@austinhydroax]

Another OUTSTANDING video. You really do a great job bringing me up to speed on the newer technology. thanks!

[@joemasterman4305]

Absolutely the best instructional videos on KZbin, you sir are a true pillar of the automotive industry, keep up the good work!

[@WeberAuto]

Thank you very much!

[@geojor]

you teach on a level that everyone can relate to, thank you ...

[@WeberAuto]

Thank you!

[@jacekkubiak4616]

Perfect voice for teaching easy to understand for my french poor level in English. Pleasant moving around the technical parts in a very clean workplace. Thank You for all your pleasant video around the Toyota electric hybrid vehicles.

[@WeberAuto]

Thank you! 😃

[@TumpaTalapatra]

Going to watch the whole video, love the detail narration, precisely explained.

[@WeberAuto]

Thank you!

[@busterwagner7886]

These video's that you do are just amazing! I have no real need for them but I am very interested in how it all works. I bought a leaf and am going to buy a Prius prime and I just wanted to say how much I enjoy what you have done.

[@ladsongeddings100]

Professor; After watching the complication and the time element, this is definitely depot repair work; No doubt the dealerships remove and replace the whole unit. I appreciate your detailed explanations and patience in producing this excellent video for those of us interested in the engineering of battery products.

[@WeberAuto]

Thank you. You are probably correct

[@jfbeam]

Yes, the dealers will remove and replace the entire unit. Unless it's damaged, there will be no power outside the casing. Once shipped back to a service center, they'll open it up and replace whatever needs to be repaired. (I was just looking to repurpose some, and toyota lists each subunit as an FRU.)

[@vitulbansal1719]

Amazing !! absolutely amazing!! Please Sir dont stop making these videos.

[@jamesfarnham1976]

Thank you again Professor! Great video as always. For many people it's like having your Mother In Law on board all the time. 😁

[@WeberAuto]

lol, Thank you!

[@loading...7583]

another amazing video. Thank you so much for making these and educating the public sir!

[@jacekcameron-rulkowski2859]

Great video! We have a Prius Prime and appreciate knowing what is in the “black box!”

[@WeberAuto]

Thank you!

[@theinterfaithshepherd9075]

Hi there! You are really knowledgeable about all this stuff. Thank you for making such great videos. I have watched several of your videos recently regarding the batteries and working with them. I have a suggestion for you... At the beginning of each video, I think it would be a great idea to say "this is how to discharge these batteries"...and demonstrate it. I may have missed that. I think it'd be a good addition because many people without knowledge of the dangers could be helped in that way. Great stuff!!! Best wishes to you! Pat

[@laohantun7404]

Thanks Prof......bless your heart......things that I wanna see now able to see through your teaching.....

[@ClockworksOfGL]

“Cool Prius!” - Said nobody, ever. Thank you for the videos, Professor!

[@WeberAuto]

Thank you!

[@MaxSachs]

Amazing detailed video and a real pleasure to watch thank you! Some years ago I had some 1st generation Sony Konion VCT1 cells for a high-powered ebike I made--196 cylindrical cells to be exact--and it had a nominal energy density of 19.1kg / kwh. 2007 - 2010 IIRC. I put it through hell and back and after about 400 cycles the custom pack finally dropped to about 90% of original capacity in roughly 2 years, still quite useful but voltage drop and range took a noticeable hit. If I had used actual spot welds and not solder iron and copper strapping it might have lasted longer :) This prius pack has nominal energy density calculated at 21.6 kg / kwh in prismatic form which is fairly impressive, yes it's years and years later but back then prismatic cells could barely scratch 25kg / kwh and you wouldn't dream of applying a warranty anywhere close to 8yrs 160000km. We only ever used prismatics for low power demand stationary banks because they sucked for anything else! Toyota and Ford have done something amazing here: high power density, high energy density AND long life! Could definitely see myself harvesting some of these cells for my son's e-ATV and not worrying about it.

[@WeberAuto]

Thanks for your feedback

[@danielgodoy4054]

Wonderful video,as always professor John, I love your videos.

[@WeberAuto]

Thank you!

[@francoisguyot9770]

Thanks for the informative video. I enjoy watching your channel and like to answer a question you asked. The reason why someone would want to take them apart is to reconfigure the cells as a smaller pack for mobile application like an ebike or scooter. Now, 12 or 24 V is popular with RV solar storage, and you can only feed either 12 or 24 V to the inverter. that another reason why you would want to reconfigure those cells apart from those packs,. Albeit, there are some 60 V and even 72 V inverters out there but they are scarce and very expensive. 12V, 24V and even 48V are the most common sizes for DIY solar applications. Of course we could disconnect only the tabs and make multiple taps so as not to hack the pack, but we would be left with wasted cells.

[@danielnegash7985]

this is clear & net explanation thanks professor

[@lolz8930]

it's stuff like this that make me cement my choice in taking up engineering as a degree. i've always had at thing for arts, but ill be lying if i said this kind of technology is boring. amazing presentation, professor! :)

[@WeberAuto]

Thank you and best wishes with your career choice

[@Martinsp16]

This is brilliant, thank you professor!! I love your videos 😍

[@WeberAuto]

Thank you very much!

[@MichaelLulchak]

Damien McGuire pointed me to this channel. John's videos are GREAT info from a guy with hands-on experience!

[@WeberAuto]

Thank you very much

[@IACaptainKen]

Thanks for the video John. I just traded my 2012 Prius 2 for a 2018 Prius Prime last April. Just drove from Ames, Iowa to Minneapolis and back this past weekend. Made the round trip of 490 miles on 9.26 gallons of gas. Did not recharge the battery in Minneapolis so only took advantage of the electric mode only on the way there.

[@WeberAuto]

Thank you and thank you for your feedback! It is a nice car.

[@russellennis7428]

1 generation Prius 46.7 going 60 to 70 it's amazing 177 thousand miles on car I am ready get prime when the price drops

[@Erik-sq2nw]

You are so awesome, thank you for making this highly informational video and sharing this knowledge!

[@WeberAuto]

Thank you very much!

[@lcastelano]

Thank you for everything .

[@i_nahdi]

Wow A detailed and clear explanation, thank you man, I wish teach us more about hybrid cars

[@WeberAuto]

Thank you, I have 50 Other hybrid and electric vehicle videos here kzbin.info/www/bejne/r3iwlIRsf7yfeNU

[@jackonthefarm5540]

Wow. Just discovered your channel looks like all great content. I am a retired mechanical engineer that recently self educated to build an electric conversion car. As of this month I am able to drive my 1983 VW Rabbit convertible. I have 144 Li-Ion cells configured as 3P48S. Each cell is 72 Amp-hours. I have an Orion Battery Management system and 6.6 KW charger with CAN bus control. Interesting to see how Toyota does it. My battery weighs 575 pounds. (Had to buy custom made rear springs!)

[@WeberAuto]

Thank you. That sound pretty cool. Thanks for sharing

[@stevedutcher3875]

Thanks for the info on the Bolt Service Manual! I wish I would have asked you before I ordered one for my Chevy Volt, that service manual was $520.00.

[@GuilhermeGomes2]

That's an amazing job! I am doing research in Autonomous Vehicles in Athlone Institute of Technology, Ireland. Your videos are very important for me!

[@jerrettfeatherston7530]

Excellent teacher!

[@WeberAuto]

Thank you! 😃

[@mohamedrahib7685]

Thanks professor for this video God bless you

[@johnisaacson2589]

Hi, excellent video. On the point of Safety, perhaps already mentioned, the 70 Volts may not harm you but the current can. I noted you were wearing a ring. If that ring shorted across those two screwdrivers chances are that ring would instantly, flash hot, melt and you could lose fingers, eyesight and so on. Always wear goggles and always remove any conducting items from your fingers and wrists such as jewelry, watches, bands and so on. Love your videos.

[@SkaBob]

These videos are great for the people who think EV and Hybrid batteries can't be repaired and must be junked and replaced. Failed modules and cells can be replaced by qualified techs or shops, I would expect businesses who specialize in battery repair to become common in the next 10 years. You wouldn't usually replace an engine for a burned valve or bad fuel injector but some people assume a battery is not repairable. More techs just need proper training on how to deal component repair in EV systems.

[@chandrasekar3050]

Nice explanation professor 👌

[@manikhossain9159]

Lots of thanks my dear sir

[@SuperMarioDiagnostics]

Back so soon, nice!

[@WeberAuto]

Thank you!

[@cameron20020]

Have to wonder how this car would handle a decent rear end collision. Thanks for the detailed teardown!

[@WeberAuto]

Thank you, it is built to meet the crash requirements of the day. A severe crash would certainly damage the battery. It has an internal fuse as well.

[@welltekdiagnostics6835]

amazing efforts ..Many thanks

[@rossfisher323]

I bought a Prius Prime recently thanks to your videos, professor! You inspire me and I cannot wait to install a comma.ai Level 2 autonomy package.

[@eddies8452]

I have the open pilot system on my Prius, works great.

[@rossfisher323]

@@eddies8452 4 years later and a newer Prius Prime and a comma 3x is on the way. Hope you are doing well!

[@masoudhosseini9204]

Thanks again Sir. your videos are very informative.

[@WeberAuto]

Thank you!

[@paulsutton5896]

I don't like the idea that one battery stack is harmless, but connected to its fellows, it will be lethal. That is simply asking for a mistake to be made. But I enjoy these videos. Congratulations to Prof. Kelly.

[@rezagholami6069]

thanks a lot for what your doing man

[@paulpoco22]

I used to work in the Telco industry and we used negative 48Volts in all the copper wiring. The only time you felt something when ringing generator was on the copper pair, you would pull your hand or arm away.

[@TRYtoHELPyou]

Oh man!!! Another one!!!!! Thanks for doing what you do man :)

[@WeberAuto]

Thank you!

[@MattExzy]

Likewise, I'll probably never own a Prius, but I find this all very awesome and interesting. Great presentation, no pretense, clear, concise, easy to listen to, what an awesome channel with an awesome host.

[@77.88.]

@@MattExzy In my opinion the Prius is by far the very best engineered car on the road for the least amount of money my 2013 Prius lights up each day and goes down the road over 150,000 and runs well with normal maintenance, no surprises!

[@swarajjoye]

Hi Prof, thanks again for this amazing video. I wish toyota could develop more pure electric vehicles instead of hybrid. Thanks

[@WeberAuto]

Thanks, I do too!

[@kingsleymok4008]

Thank you for the video. Given some ideas to salvage those Lithium Ion batteries from the salvage yard and turn them into a giant powerwall for a complete backup power system for the home and office that will ride out the power outage for 3 days or more.

[@WeberAuto]

Great idea. Thanks for watching,

[@mattmaur01mb]

Great information..

[@patapouf75]

You are awesome. I love your show... I'm from Montréal..

[@jessievaca]

Thank You for your informative videos! I have a 2017 Prius Prime Advance and recently noticed the battery is not charging as much as it did before. I used to charge and it would tell me I had 28 or 29 miles of EV driving range now it only goes from 22 to 24 miles of range. Not bad really but I really love this car and was wondering if anyone out there is doing upgrades of this battery to up the range past the original amount? If so please point me in the proper direction and if you know an estimate on how much it would cost!

[@compu85]

The battery heater puts me in mind of a heated seat - both in the power it draws, and the construction of the woven heating element.

[@WeberAuto]

Very true, thanks for your feedback!

[@pashkamerica]

Waiting next video with 2023 prius Prime HV battery . Thanks

Thank you again professor. I wonder who are those 2 people who down vote this perfect video.

[@WeberAuto]

Thank you, I wondered the same thing. Haver a great day!

[@MrDennis600]

Thank you from germany

[@WeberAuto]

You're welcome

[@MrJuliancarroll]

I love these videos. Thank you so much for putting them together. Out of interest, how much (approximately) do the standard Prius NiMH batteries weigh?

[@WeberAuto]

Thank you! About 150 lbs (68 kg)

[@mohamedwalidmaschur9985]

Thank you very very much

[@WeberAuto]

So nice of you

[@bully6467]

Thanks a loooot ! I will understand better how my car works !

[@martinariehm7528]

Thank you very much for this video! The electrical equipment of the Prius has a good size and complexity to be able to understand what is going on in BEVs. Good for learning! I was wondering: when did you connect the two duct air temperature sensors? I missed it. And since they are in the back of the battery, that should be quite the cabling?

[@psycho2soundz]

Hey John! Thanks for what you do. Do you know if the newer Prius uses the same cells? Have you dived into one?

[@rollingrock5143]

Came here to see the battery and learn about it. Left inspired by the Professor's tenacity.

[@WeberAuto]

Thanks for watching

[@DrLightWind]

Congratulations, great instructions. And since you're the expert I have a question for you, because I know you can figure it out for my needs, I also have a Prius Prime 2021 but the range is enough only one way. So my question is that is that would be possible somehow to install another battery pack to hook up parallel with the existing battery pack? To double up the range and remove the rear seats to install the extra pack.

[@chaughten]

Wow you are amazing, thanks!

[@WeberAuto]

Thank you very much!

[@wcg66]

So, it seems to me, the best you can do for DIY battery replacement on the Prime, is to get new or reconditioned packs rather than individual cells. Previous batteries were fairly straightforward for cell replacement. It shouldn’t be an issue for a decade but good to know now though. Great video.

[@WeberAuto]

Thanks for watching

[@sudheerkumar5966]

Very good sir

[@batteryyesa1328]

learned, thanks

[@truthseeker4703]

ur the best keep going 👍

[@WeberAuto]

Thank you

[@manishgurav3783]

Nice one

[@77.88.]

If I can fully understand what you are saying and doing at 80 years old these younger fellows should really understand? I was a mechanic for much of my life going back to 1964 when I was privileged to work for an Italian in San Francisco on Pacific Ave. I have so much respect for Nemori Barbeari taking in this young fellow ME that knew very little about how cars worked! ?

[@WeberAuto]

Thanks for watching

[@waltersavonian7551]

thank you so much for all your detailed and exacting teardowns and reassemblies. In particular I am wondering about adding the parts necessary to make my North American 2019 Prime Level 3 charging compatible. In you professional opinion do you think this is a doable project?

[@geraldito7777]

Thanks sr!

[@theamazoner4075]

Please get ur hands on a Subaru Crosstrek PHEV. I heard that it has motors from camary hybrid and battery cells from Prius Prime .

[@kens97sto171]

Love the videos.. glad to see you back doing your great explanations of these cars. Does anyone else get the feeling this battery pack was an afterthought.. it seems the pack is constructed of extruded aluminum, and does not really mold itself into the car well. The previous gen priuses had stamped steel battery containers that were molded shapes... This one seems very square and just bolted into the car. Maybe it was the best they could do with the existing vehicle..

[@WeberAuto]

Thank you, I had the same initial thoughts. The more rigid construction could be for crashworthiness. The previous generation Prius batteries were is the safest part of the vehicle (between the two rear wheels). This model extends the battery into a rear crumple zone.

[@tarassu]

Looking at copper wire pattern, it definitely mimics heat loss pattern in cold weather (central part cools down much slower. Difference can be 3-8 degrees 5 hours after driving). Corners lose faster than outer stacks.

[@WeberAuto]

Good information. Thanks for your feedback!

[@charithkalhara8763]

thank you very much sir

[@WeberAuto]

Thank you

[@CalebaFamily]

Can you please do the comparison between the 3th gen plug-in ang regular battery, anyway to swap them like a conversion to plug in...

[@AlastairCunningham]

Thanks again for another wonderfully detailed and informative video. I've been avidly watching for years since I stumbled on your first video about the power split device while trying to understand how Toyota made a CVT out of a single planetary gear. These videos must take ages to produce. Does the Prius Prime have another HV battery for when it is running in classic hybrid mode instead of full EV, or does this one battery perform both functions?

[@WeberAuto]

Thank you very much! Yes, each video takes many days/weeks of preparation, shooting, and editing. The Prime does not have a different battery for the hybrid (HV) mode. It just uses the same battery and uses about 2 percent of the state of charge while in that mode.

[@Billscienceguy]

@@WeberAuto SO WHATS UNDER THE SEAT?

[@oneundecided]

Thank you for the video. May I ask you what android software can be used to diagnose each battery cell voltage and health?

[@ChargedUp]

Another great video - so max charging amperage would be 30A I'm assuming? What would be max charging wattage on the Prius Prime?

[@WeberAuto]

Thank you! No, I think the Prius prime max charging rate is 3.3kW, so at 240V the current will be 13.75A

[@mirzamunawarbaig4837]

Nice

[@mbm797]

Professor Kelly, what do you think is possible to install another of the same batteries in Prime? The goal is to increase the number of miles on electricity. What can be the problems when installing the second battery?

[@user-jz8oz1pm5s]

Hi Professor. Can we put this battery pack in a 3rd generation prius plug-in 2015?

[@beforebefore]

Overall battery pack dimensions? BTW... great videos... as always!!

[@jm100368]

its amazing that the tesla model 3 long range battery gives over 300 miles of range in a battery that only weighs 1100 lbs

[@beforebefore]

In the heaters, they don't use Copper wire, but Nichrome wire. Copper has too low of resistance, Nichrome is high resistance and is used for heating elements of all kinds.

[@qettyz]

So when we see Toyota Mirai videos? Isnt that one of them tanks behind you at 10:43?

[@WeberAuto]

Probably never, there are no stations in our state. That is an old CNG tank

[@theamazoner4075]

Interesting I'm supprissed they didn't use 18650 size batteries tho I suppose that would make modifications to easy haha. On an unrelated note what sort of emissions thing does the 4th gen Prius have. In the second gen Prius their is the coolant heat storage tank, on the third gen their is the EGR what does this generation of Prius have?

[@ulyhappy]

Those 'heat sink' separators you descibe as thermally conductive Nylon, are quite clearly marked >PP< (polypropylene)

[@jamest.5001]

Would it be possible to swap this type batteries in a older Prius?

[@Maltanx]

Thank you again for posting such detailed videos. After seeing all your battery disassemble videos, i have one question: why there is so much difference in energy density with the batteries? This battery is just 8kwh, and the battery of the chevrolet bolt is 60 kwh, however it seems that the size of the chevrolet battery is no more than three times the size of this battery. I noticed that the lower the capacity of the battery, the bigger it gets in proportion to the capacity. I thought that since the electronic takes about the same space in all the batteries, the smallest ones would need much more space in proportion, however the difference still seems too big to explain it this way.

[@WeberAuto]

The larger physical size of the battery cells, the higher it's capacity in Amp hours (Ah) will be. The more cells you wire in series with each other, the higher its voltage will become. The kWh rating is the product of both of those. For example, the Prius Prime battery is rated at 25Ah and it's voltage is 351.5V, so it's kWh rating is 25Ah x 351.5V = 8787.5 Wh or 8.7875 kWh. The Bolt EV battery is rated at 162.7Ah at 350.4V = 57,010 Wh or 57 kWh. I hope that helps.

[@WeberAuto]

Air cooling takes up more space on the Toyota battery verses the liquid cooling on the Bolt EV battery. The Bolt EV battery has very tight and compact electrical connections between battery modules verses the electrical harnesses that a Toyota is using. If you compare mass, the 25Ah Toyota battery modules at 186 lbs to the 161Ah Bolt EV battery modules at 800 lbs, the Bolt EV battery has much higher density.

[@ClockworksOfGL]

Nax FM - Liquid cooled batteries (like on the Bolt) can be tightly packed together, compared to the Prius’s air cooled pack. It’s also possible (and I’m merely speculating here) that Toyota made a trade off energy density - at the chemical level - for better stability at extreme temperatures. IIRC, using more manganese in the cells makes them more tolerant of abuse, at the expense of physical density. The Bolt, Volt, and Tesla cars’ liquid thermal management systems allow them to keep the cells in a tight temperature range.

[@2927usmc]

Maybe I missed it, at what temp do the cooling fans turn on? I assume both turn on at the same time. Thx

[@Trades46]

Despite its small 8.8 kWh rating & less advanced design when compared to the Volt or Bolt, you have to be amazed how Toyota retains its conservative nature when it comes to battery thermal management in terms of cooling & heating to keep it at optimal temperatures. In that same respect, I almost want to shake my head at how cheap Nissan was that even the newer 2018+ Leaf 40 kWh does not even possess a fan to cool off its larger & more stressed battery pack. I just recently brought a Mitsubishi Outlander PHEV. The car is brilliant & I have been learning much through technical papers on forums. Are you interested in taking one apart and doing an analysis on that car anytime professor?

[@WeberAuto]

Thank you for your feedback. The Leaf is a huge disappointment. As for the Mitsubishi, I am interested, but it is unlikely I will ever have access to one. They are not a popular brand around here

[@orfescuhoratiu]

kona ?

[@Trades46]

Not out in North America until next year. Only Korea & Norway has gotten the Kona EV for now.

[@mecanicaautomeccentroautom4787]

Show 👏👏👏👏

[@WeberAuto]

Thank you

[@JohnClulow]

I'd guess each heater section has a different wattage, accounting for the design differences, these wattages being chosen to obtain rough equivalence of heating rate with a given ambient. You allude to this. Regarding "safe" DC potentials, these are assuming some typical resistance for human skin, and this _can_ very substantially depending upon moisture and electrolyte levels. Regardless of regulations, always err on the side of caution since it only takes 100 mA across the heart to cause it to go into fibrillation. A cut in the skin can immediately drop resistance. A DC voltage under 50VDC could easily prove fatal if delivered below the skin and across the heart.

[@WeberAuto]

Good points, thanks for sharing

[@kv8734]

Can you charge the battery when it's removed from the car? It looks like the BMS is within the Hybrid battery pack

[@netprep]

How does the cell sensor harness connect to the individual cells?

[@natedavis5574]

Sir what are you using to label that tape like that and what type of tape is that