Vinnilling
100 µW
(sigh...) I need help please!
I bought a 48V20ah battery from a local ebike shop and unfortunately its too heavy... 30 lbs. So I removed the cells from the case and found 32 flat cells, 2 x 16 at 10ah. Makes sense...
http://www.alibaba.com/product-detail/China-Liao-lifepo4-battery-3-2v_1719915740.html
It seems well built and they used copper strips to connect the cells in parallel / series configuration, I assume for efficiency. see attached pic. So there is a copper strip connecting 4 terminals, 2 brass to 2 silver and then alternating. I think the silver are positive and brass are negative? Connecting the positive lead on my voltmeter to the silver terminal and black to brass shows +3.6v. So please correct me if I'm wrong.
So, because of the way they built it, I had to dismantle the entire pack. I took 16 of the cells and alternated positive to negative back to back and cut the copper strips in half, trimmed them which I will use to connect all 16 of them in series.
Here's my questions...
1) The pack has a voltage of 57.x volts.. is this too much for a 48 volt controller? Crystalyte 4840. Should I remove a few batteries to lower the voltage?
2) The BMS has 17 balancing wires and from what I read, I can't just Willy-nilly attach any BMS wire to any battery in the row... they need to be in order so that the correct voltage at that point in the pack goes to the proper wire... am I right so far?
3) If the question above is correct: From the picture attached, I'm assuming that we start at the negative wire where it is 3.6v after the first battery, 7.2V after the second battery, etc. But how do I know which BMS wire to connect? The BMS connector has "CN1" on one end and "GND" at the other... Can I connect everything together except for the BMS wires and measure the voltage at each BMS wire before I connect it? and if so, where do I measure it to? the black wire or red wire...?
4) If each battery gets 1 BMS wire and there are 16 batteries (or less, re question 1), what do I do with the loose wires? Just tape them up?
Thanks for any feedback!
Vinny
I bought a 48V20ah battery from a local ebike shop and unfortunately its too heavy... 30 lbs. So I removed the cells from the case and found 32 flat cells, 2 x 16 at 10ah. Makes sense...
http://www.alibaba.com/product-detail/China-Liao-lifepo4-battery-3-2v_1719915740.html
It seems well built and they used copper strips to connect the cells in parallel / series configuration, I assume for efficiency. see attached pic. So there is a copper strip connecting 4 terminals, 2 brass to 2 silver and then alternating. I think the silver are positive and brass are negative? Connecting the positive lead on my voltmeter to the silver terminal and black to brass shows +3.6v. So please correct me if I'm wrong.
So, because of the way they built it, I had to dismantle the entire pack. I took 16 of the cells and alternated positive to negative back to back and cut the copper strips in half, trimmed them which I will use to connect all 16 of them in series.
Here's my questions...
1) The pack has a voltage of 57.x volts.. is this too much for a 48 volt controller? Crystalyte 4840. Should I remove a few batteries to lower the voltage?
2) The BMS has 17 balancing wires and from what I read, I can't just Willy-nilly attach any BMS wire to any battery in the row... they need to be in order so that the correct voltage at that point in the pack goes to the proper wire... am I right so far?
3) If the question above is correct: From the picture attached, I'm assuming that we start at the negative wire where it is 3.6v after the first battery, 7.2V after the second battery, etc. But how do I know which BMS wire to connect? The BMS connector has "CN1" on one end and "GND" at the other... Can I connect everything together except for the BMS wires and measure the voltage at each BMS wire before I connect it? and if so, where do I measure it to? the black wire or red wire...?
4) If each battery gets 1 BMS wire and there are 16 batteries (or less, re question 1), what do I do with the loose wires? Just tape them up?
Thanks for any feedback!
Vinny