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  1. BlueSwordM

    Lithium Titanite battery source?

    Your best bet would be just going with LFP cells.
  2. BlueSwordM

    Tabless design cylindrical cells tests

    On the topic of bleeding edge cells, does anyone here know if some manufacturer is planning to make direct path tabless cells? I've only seen CALB make an announcement on this back in 2023 for their large format cylindrical cells. Since then, nothing. Direct path tabless cells, otherwise known...
  3. BlueSwordM

    Cycle life tests of High Energy density cylindrical cells

    Oh boy, 4V = I want a partial refund. Shipping at 4V is likely not legal as well.
  4. BlueSwordM

    Are Solid-State Batteries the Game Changer?

    Honestly, I'm tempted to respond, but I can smell the data collection from something that sounds like someone writing with an LLM.
  5. BlueSwordM

    Possible to use a BMS to charge individual cells?

    That will work. Alternatively, if you want to do it quickly, you could acquire an active balancer.
  6. BlueSwordM

    Have You Ever Faced Charging Problems on Long EV Drives?

    My personal experience is that it's fine as long as your pack charges quickly enough or if you can bruteforce range. To make long trips smoother, just drive a bit slower than you'd expect, use a vehicle that can charge as fast as possible, and preferably map out charging points before the trip...
  7. BlueSwordM

    Cycle life tests of High Energy density cylindrical cells

    High silicon anode rearing its head once again. I don't think my heart can take the possibility of getting anywhere near close to the theoretical energy density limit (around 3.3kWh/kg for a full cell). At this point, I'm expecting 700Wh/kg cells to appear next year, 800Wh/kg in 2027...
  8. BlueSwordM

    Cycle life tests of High Energy density cylindrical cells

    >Charge -20-70C We're cooking now boys and girls.
  9. BlueSwordM

    Tabless design cylindrical cells tests

    Nope. On my end, Grade A for 2500pcs is quite a a bit more expensive than that :)
  10. BlueSwordM

    Which Budget Spot Welder Should I Buy for a Few Battery Packs?

    No, it's just too weak mechanically. Well, it can carry the same amps as a 0.4x8mm nickel strip.
  11. BlueSwordM

    Which Budget Spot Welder Should I Buy for a Few Battery Packs?

    Nope. That was raw 0.1mm copper. However, don't even bother not using a steel/stainless steel/nickel-copper sandwich; 0.1mm copper is far too weak to use in real battery pack.
  12. BlueSwordM

    Silicone Carbide + Semi Solid State

    I should have worded my statement differently. #1 I meant to write pareto-optimal: you get most of the energy density gains with 30% equivalent Si loading. #2 For pure silicides/silicon carbide, the maximum Si loading you can have is around 55% because of their chemical makeup; it is...
  13. BlueSwordM

    Silicone Carbide + Semi Solid State

    Actually, I'm not guessing :) All of the CN phones having 5500-6000-7000-7600-8000mah are using Groupe 14's silicide/silicon carbide anodes. https://group14.technology/resources/press-releases/group14-enters-production-to-power-the-next-generation-of-smartphones-for-atl/ Of course, their Si...
  14. BlueSwordM

    Silicone Carbide + Semi Solid State

    Nope, these aren't solid state electrolyte cells. They're just high Si anode HV LCO cells using silicides as Group14's anode tech (likely silicides since they're the absolute best way to get up to 55% Si loading in anodes).
  15. BlueSwordM

    Cycle life tests of High Energy density cylindrical cells

    Something something Alibaba supplier sent me a message that they're now available if I'm willing to pay 15-20% extra than the BAK 45Ds I've been eyeing.
  16. BlueSwordM

    Cycle life tests of High Energy density cylindrical cells

    Of course, but there's the corporations' market, and then there's the small business market. I wouldn't be surprised "smaller" companies like FEB prioritize the highest grade cells for those who order 500k+ cells to millions of cells every year, and then we got the "scraps" for a while. But...
  17. BlueSwordM

    Cycle life tests of High Energy density cylindrical cells

    Another supplier of the FEB 6000mAh cell did tell me that FEB might have done some naughty things around the cell's release regarding battery grades. Apparently, most of those cells on the market are actually B-grade currently, and only recently have true A-grade cells been a thing; FEB/FST's...
  18. BlueSwordM

    Thread for new battery breakthrough PR releases

    Getting power out of packs usually isn't the bottleneck. Also, those Tesla cars are using active heating to increase power density of those cells, not exaclty fair. The real problem is fast charging and if you can increase cell capabilities, that faster charging is always better.
  19. BlueSwordM

    Axial Flux E motors.

    Apparently, plenty of scooters do use axial flux motors: https://archive.ph/6YIej#selection-1959.0-1959.70 "The worldwide market for the kind of vehicles Lyra is rolling out, first in Indonesia, is massive. In Asia alone, 45 million units are sold every year, and the global market for...
  20. BlueSwordM

    Thread for new battery breakthrough PR releases

    It's far easier to make specialized packs that excel in their respective areas, especially when it comes to cost and cycle life. For example, let's just say your target energy density is 300Wh/kg. You could either build a pack using 300Wh/kg cells with 700 cycles, or build a mixed pack that...
  21. BlueSwordM

    Thread for new battery breakthrough PR releases

    So, I've done a lot of reading and research, and I'm ready to talk about CATL's latest release: https://www.newswire.ca/news-releases/naxtra-battery-breakthrough-amp-dual-power-architecture-catl-pioneers-the-multi-power-era-877256858.html In summary, we have: 1. 175Wh/kg sodium ion cells with...
  22. BlueSwordM

    Molicel P50B variable charge-rate cycle life test

    Outside of what Padja already wrote, stopping charging at max voltage serves as a sort of CC only charging, which does help with battery lifetime and with overpotential, serves as a sort of SOC limiter.
  23. BlueSwordM

    Cycle life tests of High Energy density cylindrical cells

    Well, if that's the case, EVE 33V, EVE 35V, Samsung 35E, Molicel M35A, BAK NCR18650CG-35E (better electrolyte alternative to the Samsung 35E), Lishen LR1865HB are all great choices, althought I'd pick the newer cells 18650 like the Molicel M35A, EVE 35V and BAK's variant would be your best bet.
  24. BlueSwordM

    Cycle life tests of High Energy density cylindrical cells

    The best low price high energy cells are likely to be the EVE 50E, Samsung 50G, and other similar 21700 cells in this category. I would avoid going with 18650s these days since smaller cells increase pack building costs and 21700s get most of the advances these days.
  25. BlueSwordM

    Cycle life tests of High Energy density cylindrical cells

    These look nice. Anyway, those LFP cell numbers are honestly awful for a "modern" LFP cell. It'd likely to do better in a larger package if made by another manufacturer.
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