Recent content by BatteryMooch

Thanks for posting those! I can see the Microchip MCU and some latches, perhaps to hold the balancing channel on/off states. Can’t read any other chip numbers but no worries as I’m not going to dive into the design any further. Always really enjoy seeing how a commercial BMS is designed and laid...

Thank you @amberwolf for the extra photos. That’s a burly-looking BMS…wow. For the resistors you noted, I agree. I’m amazed though by the number of passives in the central portion of the board. But perhaps that’s due to its age, before the high level of integration (into single chips or low chip...

Thank you for posting that teardown! Considering the price, that pack would technically be called A Piece Of Junk. The cell handling/mounting is almost criminally negligent. That BMS has a huge number of passives. It would be great to see the other side if not too inconvenient. Interesting...

A few thoughts…. - Water and aqueous firefighting solutions are the most effective way to fight a li-ion fire. The water helps cool the cells below the thermal runaway threshold temp, stopping the reaction, and is more than adequate for putting out the “conventional“ fire from the plastic...

I’m thinking we still need to see the “tabless” 18650’s and 21700’s actually go tabless. All of them still have a cathode tab (from current collector plate to the cell contact) and the BAK 45D even has an anode tab.

This might have been part of CATL’s lawsuits against CALB, which CALB pretty much lost (but are appealing), and so the tech is not being used by others? And CATL might have thought it just wasn’t worth the expense of finishing development and modding their production line(s) for the small number...

Each grade has its own acceptable level of capacity variance. So ”Grade B” doesn’t have a larger than acceptable variance for the manufacture, just larger than what could make it “Grade A”. It could be perfectly acceptable for a “Grade B” cell and millions upon millions of them are used...

There’s the remote possibility that they were a return (from a previous customer) too.

Sounds like they were tested by someone, maybe at Nkon or maybe by their supplier.

Yes, tabless: https://www.highstar.com/companynews/317#

The Z30 is looking pretty close to the LT 19660’s (JP30?) I recently tested. It will be very interesting to do a shootout with those two and the 30D!

Hmm…hadn’t considered that. And I am usually am pretty skeptical/suspicious…😔

A couple years away from full production, still LOTS of work to do to scale up production successfully (high enough yield), expensive as all heck, other tech like Na-Ion catching up with a lot of (true) solid-state battery (SSB) benefits. CATL just announced a 2025 release of their Na-Ion cells...

Interesting! i haven’t heard about it and it’s not mentioned in their 2024 annual report (recent cell developments).

Nothing, if I had an opinion I could express. But I am just not able to say it’s definitely the 50PL as that wouldn’t be true and exposes me legally. Even if I offer just an opinion and someone blows themselves up, even if their fault, I’ll still be named in the lawsuit for sure. Each person...