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Recent content by EV-Tech Exp

  1. EV-Tech Exp

    V3 Supercharging Profiles for Model 3

    Recently I've had to be away from the forum as I've been super busy with work and life, though wanted to check in as I recently visited the first V3 supercharger outside of the US, and this thread was an excellent resource when aiming to understand what speed I should achieve! My achieved...
  2. EV-Tech Exp

    Battery Degradation Scientifically Explained

    Potentially - let's see where the technology takes us and what the best engineering solution for the available technology is!
  3. EV-Tech Exp

    TeslaFi - Battery Degradation Reports (upload your data)

    Some interesting trends emerging here. Anybody know if this TeslaFi data can be exported for us to start building up a database to do some analysis?
  4. EV-Tech Exp

    Battery Degradation Scientifically Explained

    Yes - to prevent lithium plating. You're building more and more lithium ions at the surface of a graphite anode particle, and building up a big difference in concentrations of lithium particles at the surface in comparison to the core of the particle. . If the rate at which the lithium ions...
  5. EV-Tech Exp

    Battery Degradation Scientifically Explained

    The magnitude of the impact made by the cathode phase transition is small in comparison to the SEI on the anode. I've recently taken delivery of my car and plan to charge to 70-90% daily as my needs dictate and not worry about things too much!
  6. EV-Tech Exp

    Battery Degradation Scientifically Explained

    What you're currently doing is probably fine. Charging to 75% and staying above 60% to not go through the cathode phase transition *might* be beneficial, though it might not. When we observe degradation of the battery, we are observing the weakest link, which is usually the anode, thus reducing...
  7. EV-Tech Exp

    Battery Degradation Scientifically Explained

    For cells with a graphite anode, as per most lithium-ion batteries in the world, the stated charge rate is typically lower than the discharge rate, and this is typically limited by the rate of diffusion in the graphite, (from the core to the surface of a particle or vice versa). As the system is...
  8. EV-Tech Exp

    Model 3 battery bond wire fuseable link size

    Interesting. What's the backstory?
  9. EV-Tech Exp

    Battery Degradation Scientifically Explained

    Interesting findings from the early days @darth_vad3r !
  10. EV-Tech Exp

    Tesla's 85 kWh rating needs an asterisk (up to 81 kWh, with up to ~77 kWh usable)

    Really fantastic post; clearly indicates use of simultaneous extended kalman filters for prediction of individual 'brick SoC', which enables adaptive balancing. I'm more impressed that the BMS algorithms are so drastically revised via an OTA update!
  11. EV-Tech Exp

    Battery Degradation Scientifically Explained

    Getting occasionally upto 100% won't be too much of an issue if you don't leave it there for significant periods of time - this about it as the likelyhood of an undesired reaction increasing rather than an irreversible balloon stretch.
  12. EV-Tech Exp

    Battery Degradation Scientifically Explained

    @wk057 - An absolutely fantastic post! Sounds like they've implemented extended Kalman filters which have enabled adaptive balancing.
  13. EV-Tech Exp

    Battery Degradation Scientifically Explained

    Sounds like you've found the real world limitations of carmakers trying to make things 'simple' for the customer....
  14. EV-Tech Exp

    Battery Degradation Scientifically Explained

    Agreed - The power definitely enters the battery, but is highly likely to bypass the cells and directly go to the battery heaters, if indeed battery heaters are present within the pack. Given how well the Tesla pack is designed, I'd be extremely surprised if the energy was transferred via the...
  15. EV-Tech Exp

    Battery Degradation Scientifically Explained

    I'm glad you found it useful and clear! I don't think you should worry about occasionally charges to 100%, primarily because 100% indicated SoC isn't 100% real SoC. I can't think of any reason a single charge to 100% would have any significant impact, so I wouldn't worry too much, and...

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