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  1. BatteryMooch

    Thread for new battery breakthrough PR releases

    Thanks! That’s a link to just the abstract though, the paper is behind a paywall. Could you post the link to the full paper?
  2. BatteryMooch

    Tabless design cylindrical cells tests

    Agreed! Interestingly, the BAK web site lists a 50A continuous rating (versus their LinkedIn post with that 60A/100A graphic): INR2170-50D-bakpower We’ll have to see what makes it into the datasheet. 🙂
  3. BatteryMooch

    Tabless design cylindrical cells tests

    Agreed…30A continuous it appears with a 50A temp-limited (to 75°C) non-continuous rating. Certainly not bad but not a standout cell. But Murata isn’t a manufacturer I would expect that from anyway. And if it’s priced accordingly (if ever available) it can be a great deal If you don’t need the...
  4. BatteryMooch

    A handy passive to active battery cooling blog post?

    For “standard” chemistry li-ion cells 80°C is about where the electrolyte starts to break down and certain exothermic reactions start. But it’s a long way from the roughly 250°C (or even higher) needed to break down the cathode material and start the violent thermal runaway reaction. I’ve...
  5. BatteryMooch

    There now IS a Samsung “58E” 21700

    I’m sorry…which issue? That’s the 50GB and it should have 50G on the metal can near the top (visible through the wrap).
  6. BatteryMooch

    Porsche "AC battery"... isn't.

    Interesting! Some solar panel installations use micro-inverters distributed across the array to create easy to install and replace modules, spread the heat, and reduce the impact of any one inverter failing. Maybe the EV manufacturers liked what they saw?
  7. BatteryMooch

    Tabless design cylindrical cells tests

    Can you post where that table was found? I’m curious because it has older A Series cells in it, which are being phased out, and I’m wondering if the P68B is still in development or if the P60B, P70X, or another cell is its “replacement”? Thanks!
  8. BatteryMooch

    DIY Pulse Arc welding copper directly to cells

    Something to consider… While damage can occur to the central internal weld pointon the bottom of a cell (if we try to weld there externally) another, possibly larger, concern is that the cell’s electrolyte starts decomposing at about 80°C… a temp easily reached. No visible damage to the inside...
  9. BatteryMooch

    Tabless design cylindrical cells tests

    Excellent! Will you be posting any DIY info so others can try it?
  10. BatteryMooch

    "Spontaneous" Combustion of Li Ion Cells

    Ahhh….forgot about that. Thank you. Might be a long time between the “topping off” cycles (depending on the cell) but it still keeps the cell at a very high SOC which is never good.
  11. BatteryMooch

    "Spontaneous" Combustion of Li Ion Cells

    True, but the charger is disconnected (no current flow) in probably all of those laptops when charging is done.
  12. BatteryMooch

    "Spontaneous" Combustion of Li Ion Cells

    I looked around but couldn’t find your post mentioning a paper that would cover this. Do you have a link? I ask because AFAIK the decomposition temps for the high-NI cathode materials like NMC811 aren’t very dependent on SOC. At any SOC level you start to get exothermic oxygen release at some...
  13. BatteryMooch

    "Spontaneous" Combustion of Li Ion Cells

    30% charge level or so. Room temp or cooler. Ventilated, non-flammable container+location where huge volumes of incredibly toxic smoke won’t be much of a problem. Sealed container = pipe bomb. Separate all packs so one on fire can‘t ignite all of them. Remember, cells and burning ejecta can be...
  14. BatteryMooch

    "Spontaneous" Combustion of Li Ion Cells

    They can certainly go into runaway but there is MUCH less energy available for the reactions so they will be milder and at a lower overall temperature.
  15. BatteryMooch

    "Spontaneous" Combustion of Li Ion Cells

    There are a lot of failure mechanisms that can lead to a cell catching fire. Not all of them occur right after some noticeable abuse. For example, a cell with an internal short circuit can sit right at the point where the exothermic reactions cause just enough heat to keep things “smouldering”...
  16. BatteryMooch

    There now IS a Samsung “58E” 21700

    Definitely some interesting things to consider! The flood of “faulty battery” lawsuits by individual users that blew themselves up led to the adding of warnings to cell wraps. I’m wondering if these new model numbers are just an extension of that practice, hiding whatever they can to confuse...
  17. BatteryMooch

    There now IS a Samsung “58E” 21700

    Updated my post with a link to my test report…sorry for adding it late…6065mAh and 6087mAh IIRC at standard 0.2C rate to 2.50V.
  18. BatteryMooch

    There now IS a Samsung “58E” 21700

    They’re up to 6Ah now, the Vapcell F60 is one example. I forgot what the consensus was regarding which cell they’re wrapping…FEB? Delivered over 6Ah in my testing: Bench Test Results: Vapcell F60 - 12.5A 6000mAh 21700
  19. BatteryMooch

    There now IS a Samsung “58E” 21700

    I’m wondering if we can go another digit farther… The 55E has a “standard typical capacity” spec of 5490mAh and is “CC5493F101”. The 45T has a (rumored) “standard typical capacity” spec of 4500mAh and is “CC4503F101”. So it appears we can pull out “549” for the 55E‘s capacity and “450” for the...
  20. BatteryMooch

    There now IS a Samsung “58E” 21700

    That makes a LOT of sense! Wish they could have used “CC55xxF101” instead to match the “55E” designation on the can but perhaps there are typical vs minimum vs rated capacity considerations here.
  21. BatteryMooch

    There now IS a Samsung “58E” 21700

    March 30, 2025 edit: I posted about this a while ago to my patrons, there now is a Samsung 58E floating around…model number CC5733F101 Ver A with “58E” on the can. The CC5493F101 Ver C discussed below is still definitely the 55E and not the 58E. *********************Original post...
  22. BatteryMooch

    Bench Test Results: AM04 - 45A 4000mAh 21700

    I think only thermistors are supported by the VESC controller-based test rig he has.
  23. BatteryMooch

    Bench Test Results: AM04 - 45A 4000mAh 21700

    THIS REPORT IS BASED ON MY TEST RESULTS, RESEARCH, AND DISCUSSIONS WITH PEOPLE IN THE BATTERY INDUSTRY. ALL STATEMENTS HERE ARE JUST MY PERSONAL OPINIONS AND ARE SHARED ONLY FOR INFORMATIONAL PURPOSES. The full AM04 test report (two documents) is done and posted to my Patreon wall so I can...
  24. BatteryMooch

    Copper Strip DC Ampacity

    You need to define “handle“. Are you referring to a desired max temp rise? The melting point? A certain voltage drop? In open air or under fishpaper/heat shrink? If in open air…fan cooled? With heavy wiring or lugs close by or longer strips of just copper?
  25. BatteryMooch

    Tabless design cylindrical cells tests

    I’m thinking that standard rosin flux, or using anything that is all flux, won’t help. It’s used to dissolve oxide layers for helping low temp soldering. Resistance (spot) welding blasts through the minor oxide layer that’s on copper all on its own. Using a “flux” with metal powder mixed in...
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