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    Cheapest Active Cell Balancer Project

    Thank you Chris :)
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    Cheapest Active Cell Balancer Project

    Hi all, I finally got the chance to learn KiCad to redraw the final schematic of the project. I decided to open source it because I can't manufacture it myself as I am in a financially challenged situation. I also posted one of the boards to @Vanarian for a review, unfortunately, it was lost...
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    How to use a 60v battery pack on 48v motor

    Thank you for your reply :)
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    Video-New Lithium Battery Research,Jeff Dahn,Dalhousie-Tesla

    Thank you for your summary, I really appreciate it. Do you know if the degradation can be electrically reversed by any chance? I was hoping for it to behave almost like sulphation in lead acid battery technology. I had some successes desulphating it by feeding high voltage pulses before.
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    How to use a 60v battery pack on 48v motor

    Wow, what controller did you used? I own a 1000W 48V hub motor kit too, but the included controller uses 70V mosfets.
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    Cheapest Active Cell Balancer Project

    Students in da house woot woot :lol: :lol: I will check with the local post office, hopefully you don't have to pay for the shipping. :)
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    Cheapest Active Cell Balancer Project

    Thank you for the support! :)
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    Cheapest Active Cell Balancer Project

    It depends on how you define a feedback. If you looked at my hackaday log, you will see that it does have a feedback at the output node.
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    Cheapest Active Cell Balancer Project

    Hi Vanarian, Thanks for checking the logs, I appreciate it. At the moment, I got the balancing tolerance down to lower than 0.3%, that is just under 10mV for 4.2V li-ion cells. Yes, I don't plan to sell many of them as I am still in a uni, I worry I can't time manage myself. Your cells...
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    Cheapest Active Cell Balancer Project

    Hi, Thanks :) No, I use a synchronous buck topology. It has no deadband at the moment. It will never stop equalising as long as the total voltage is above 5V. I plan to add auto shutdown later. Yes, that is how it will work. It is better than using bleeder resistors ;)
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    48V ebike battery pack - 91 cell 14Ah

    Hi, Sounds like you are building a 13S6P pack. Adding cell level fuses might be a good idea. The 20A I believe is for discharge. The BMS that you posted will take a long time to fully balance the entire pack (it says 30mA). 10Ah of capacity might take days to complete. I have 48V 1000W ebike...
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    Cheapest Active Cell Balancer Project

    Hi :) That is the plan. ;) I designed it that way so that i don't have to measure individual cell voltage, this simplifies monitoring. Feel free to suggest any features. :mrgreen: At the moment, I am working on optimising the close-loop stability. I post most of my progress on hackaday if...
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    Cheapest Active Cell Balancer Project

    Hi :D The maximum current is set by the chip (around ~3A), but I want to limit it to 1A for safety reasons. This is a simple active balancer, the max voltage is always half of 2S cells (it will auto adjust). For example, if you have 2S cells staying at 9V, the max voltage per cell will be...
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    Cheapest Active Cell Balancer Project

    In case anyone is interested, I am posting my progress on https://hackaday.io/project/20825-low-cost-non-dissipative-active-battery-balancer
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    Fuses on BMS balance wires?

    My battery pack recently caught on fire because of the damaged insulation of the balancing lead. Because of that, I planned to add polyfuses on my non-dissipative active balancer project. Be careful!
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    Cheapest Active Cell Balancer Project

    Hi Punx0r, I don't think I will be able to sell more than 20 units, so, I will take that as a green light for me. Now that you mentioned it, I will definitely add polyfuses in the final design. I will be assembling the prototype board to send to you. Give me two weeks to get it done and I...
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    Cheapest Active Cell Balancer Project

    Hi all, I am new here, so, let me know if I am doing anything wrong. Basically, I think I just successfully designed a non-dissipative active cell balancer using cheap jellybean parts. The cost for all material (excluding labour) is around £3 to balance a 2-cell pack at 1A. I am actually...
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    induction charging and balancing?

    Good idea! But, maybe it is only practical for small capacity packs.
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