See Tesla Battery Technology Explained In This 3-Part Video Series

APR 18 2018 BY STEVEN LOVEDAY 18

Perhaps everything you’ve ever wanted to know and understand about Tesla battery tech all in one place.

If you’re an EV fan, and especially those that really dig the deep-dive battery tech explorations, get yourself some popcorn and a cold (or warm) beverage. You’ll need to carve out about 40 minutes to get through all three videos, but it’s well worth the time.

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Tesla Model 3

YouTube vlog EV-Tech Explained recently put out this in-depth series. The narrator’s voice sounds a bit robotic, but these videos are far too interesting to not share.

You do get used to the voice after a bit. Just do like we did, consider it “soothing” and free of annoying distractions often found in many video narrations.

You can watch portions of the videos without the sound because EV-Tech Explained provides plenty of detailed graphs and visual data to assist with the message.

Anyhow, we aren’t the first to say that there’s a lot of misinformation out there about EV batteries, and more specifically, about Tesla’s battery packs. While the automaker seems to attempt to be very transparent in some aspects … other areas, not so much.

Tesla believes in open-source patents and has a primary goal of enlightening the automotive world about what the future can bring. Nonetheless, when it comes to highly advanced tech, like batteries, there’s a wealth of unanswered questions.

EV-Tech Explained has surely done its homework to give us as much information as possible. There’s really nothing else like this out there. If you have access to something related and worthwhile, please feel free to share it with us in the comment section.

Also, start a new thread about this article in our InsideEVs Forum to spark further conversation.

Without further ado, since now your valuable 40 minutes has become 45, on to the videos!

Video Descriptions (summarized) via EV-Tech Explained on YouTube:

This is the full set of a three-part video series which will explain Tesla’s battery technology in depth, with the first video focusing on the cell technology, the second dealing with the module, and the third focusing on the battery pack.

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18 Comments on "See Tesla Battery Technology Explained In This 3-Part Video Series"

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Philip

VERY interesting and clearly explained. I’ve listened to the first one and am sure the commentary is not computer generated. I think it comes across as slightly “mechanical” simply due to the narrator’s clear and precise annunciation.

EV-Tech Explained

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morrisg

Nice analysis of the Tesla P100D battery pack. I was impressed with the size of the bus bars within each module and how the module layout in the pack minimized the module to module connection length by having all module connections along the centerline of the pack.

However, the analysis of wire bonding failures was grossly misleading. Using the failure rate example of 99.9% (one part per thousand) was way too high. Consider wire bonding use in the semiconductor industry. If the failure rate were 1part per thousand, an Intel processor having about 500 connections would mean that every 2nd chip would fail final package test. Final package pass is way way higher than 99.9%, perhaps in the 1ppm range. This translates to 1 wire bond fail in 500 million bonds. Divide this estimate by 16k bonds per pack yields one failure per 31,000 packs. Admittedly a rough estimate but one which illustrates the ridiculous assumption of 99.9% yield which sounds good until you look into it.

EV-Tech Explained

morrisg,

Thank you for the feedback and glad you enjoyed the videos!

The comments around a 99.9% success rate were not specifically with reference to wire bonding, but more so to joining methods in general. Some pulse arc welding techniques have a lower success rate than this, and really the purpose was to communicate the importance of a robust and failure tolerant process.

Pushmi-Pullyu

“Using the failure rate example of 99.9% (one part per thousand) was way too high.”

Good point. Since the P100 battery pack (reportedly) contains 8,256 cells, a 0.1% failure rate would average more than 8 failed cell connections per pack! I think we can be pretty sure the failure rate is significantly lower than that.

Mark Bishop

Does the Tesla BMS have any ‘shunting’ feature to provide an even top balancing voltage for the series connected cell groups? By that I mean, can it shunt charging current around a higher voltage cell group to allow lower voltage groups to catch up as the pack nears full charge?

EV-Tech Explained

I believe that balancing on the Tesla BMS is done via resistive dissipation only.

Jake Brake

Some of the best EV videos I’ve seen.

EV-Tech Explained

Thanks!

Djoni

Undoubtly interesting and well put together video.

EV-Tech Explained

Thanks!

Get Real

REALLY excellent work her EV-Tech Explained, hope to see more of your work going forward.

Thanks a bunch.

EV-Tech Explained

Thanks!

I know this guy, and he’s definitely NOT a robot. You can hear the Yorkshire accent if your listen closely. This guy is one of the most talented and dedicated young engineers I’ve ever had the pleasure to work with. I won’t give his name away, but he might remember who I am when I say we both worked in Research a few years ago. Oh, and Kev R says hi as well as me 😉

EV-Tech Explained

Good to hear from you!

Doggydogworld

First video is great, coffee is clear and I find British pronunciations (e.g. aluminium) refreshing.

Did he say Nissan Leaf was NMC? I thought it was LMO.

EV-Tech Explained

The first generation Leaf was indeed LMO. The new 40kWh Leaf has transitioned to NMC.

Hart Ed

Turns out is it actually SOL