YOSHINO SOLID STATE Battery Dissected- WHATS REALLY INSIDE?

Now that we have seen the inside of a solid state battery what are your thoughts? NMC, Semi solid state, or Solid State? Doesn’t seem like LiFePO4 at all, but this did pass puncture tests as claimed! And the performance of the Yoshino units are impressive from my testing. #solidstate #solidstatebattery #lithium @UndecidedMF
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[johnnysweekends]

Now that we have seen the battery what are your thoughts? NMC, Semi solid state, or Solid State? Doesn’t seem like LiFePO4 at all, but this did pass puncture tests as claimed! And the performance of the Yoshino units are impressive from my testing.



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If you feel I helped you out..Consider Buying me a Coffee 👍🏼🙌🏼👊🏼😀

[videoviewer]

Crazy how many tear down videos of this product all dropped within a few days. This may be the best of the bunch. I'm guessing they are half dry cell, and marketing just ran away with it after enginnering told them that.

[JRP]

Anode and cathode, not anoid and cathoid. You can check the cell voltage to tell if it's LFP or not. Above 3.6v it's probably not LFP.

[Sylvan_dB]

I've taken apart one LiFePO4 cell and multiple "lithium ion" in various combinations - manganese oxide, cobalt oxide, and the prototypical nickel manganese oxide cobalt oxide.

I agree it did not seem like LiFePO4 other than its behavior to puncture - I took my cell apart after it had been punctured, and there was no flame or spark or heat. It was probably more than 50% charged at the time.

It seemed a lot like my other LiIon cells I've taken apart and damaged. I've only had single puncture fires when the cell was near full charged or over charged. If I discharged them first, there was little or no drama. The evaporating electrolyte and immediate oxidation looked essentially identical to that shown in this video.

Specifically, the "immediate drama" cells I've had were LiPo (Lithium Polymer, where the liquid polymer electrolyte is nasty stuff and the cells have a lot of energy when charged).

[MatthewYBarbo]

Crazy how quickly and easily lithium batteries will burn and keep burning. The pyro in me always enjoys watching these battery dissections. Thanks for sharing!

[timmccall]

What was the state of charge of this cell at time of test? Perhaps it had self discharged since removal from the pack

[TooManyHobbies]

QT-9114897 MSDS lists this battery as a LITHIUM-ION battery. So no, not solid state--well built yes, but not the chemistry that was claimed.

[gavjlewis]

Is the liquid there just to get the thin separator completely flat with no wrinkles or bubbles? Much like you use a liquid to get window tints perfectly smooth.

[t.d.harris]

I'll stick with the O.R. less toxic, stay safe brother!

[AutoReport]

All you had to do was follow the qr code. The safety data sheet for the battery pack reveals the real manufacturer and chemistry.

[artistanthony]

I am just gonna come out and say people really dont understand Solid State is just a component thing for the chemistry of whatever's used, it's not a full-on different thing.

[FIERCEHUSKY]

in the solid state batteries the separator is made of ceramic, so it shouldn´t burn or shrink like plastic does, that´s the way to identify a real solid batery

[DaveEtchells]

Great video, thanks for making it! This is the first test or dissection of a solid state battery I’ve seen. It’s certainly a heck of a lot more resilient than typical LiIon cells.

A minor pedantic point, they’re pronounced anode and cathode, not anoid and cathoid (“ode” vs “oid”)

You’ve probably figured this out yourself already, but it’s best to fully discharge a battery before dissecting it, there’ll be a lot less chemical potential sitting there waiting to turn into thermal energy. (Unless of course you want to show the parts that are potentially flammable, which might have been the point here 👍😁)

That certainly looks pretty dry/solid state to me, I didn’t see the typical liquid electrolyte. I suspect there might be some moisture bound up in the components like the black anodes or the white separator films, but possibly not(?)

(What I don’t understand about solid state batteries in general is that the ions still need to migrate freely from anode to cathode and back again, right? It seems like that would be difficult in a solid..)

[Ray_of_Light]

That is a bog standard Li-Ion battery with liquid electrolyte, sold as solid state. If that would have been a solid state battery, it would have been a real breakthrough - but no, it's a scam...

[stanpiers]

Yoshino power teardowns reveal non solid state batteries in their power stations
Based on teardowns and analysis, it appears that Yoshino Power’s portable power stations, including the B330 and B4000 models, utilize non-solid-state batteries, contradicting their marketing claims of employing solid-state technology.

Key Findings

Liquid Electrolyte: Teardowns reveal the presence of a liquid electrolyte, a characteristic of traditional lithium-ion batteries, rather than a solid-state electrolyte.
NCM (Nickel Cobalt Manganese) Formula: The battery chemistry used by Yoshino Power is identified as NCM, which is a common formula for lithium-ion batteries, not solid-state batteries.
Safety Concerns: While Yoshino Power’s marketing emphasizes the safety benefits of solid-state batteries, the use of liquid electrolytes and NCM chemistry may still pose safety risks, such as thermal runaway and fires, similar to traditional lithium-ion batteries.

[TheCornucopiaProject-bdjk]

Any other companies making them? A side by side comparison might help.

They used semi solid state in some of their brochures, so maybe that’s what it is. Aside from “truth in advertising”, my main objection is price vs. performance.

Also, like LFP, there probably is natural degradation as well. What is the practical cycle life? A 3500 cycle to 80% LFP lasts 10 years plus. But at what point will natural degradation put a sizable dent into it? If both chemistries remain viable for 10-15 years, then solid state has little advantage.

Higher charge rate? That can be interesting in cold climates with short sun exposure.

Cold weather performance? Well, for that we’d need actual batteries not a solar generator.

But most importantly, they can’t compete on price yet. I just bought a AC200L for $1200 much better price value.

[TabulaRasa]

This *might* be a semi-solid state battery but it does not match criteria for a true solid state battery. The Chinese company’s US marketing website is blatantly false advertising and the safety claims overblown. Surely a slam dunk court case. The real nail in coffin would be lab tests on the battery chemistry.

[SeattleShelby]

Cathoid. Anoid. You forgot the Domino’s Pizza Noid.

[jonbigman]

I think when that battery pouch charges it discharges a liquid and when it discharges it goes back into whatever polymer electrolyte layer they are using.

[michaelmartin]

Well, certainly looks safer than the infamous semi-solid Chins cell Will Prowse drilled. I might have to have another look at Yoshino, I have 6000wh of Bluetti but that's not exactly heftable, another 2000wh ish one would be great to run an induction cooker from.