LI-ion NiCoMn Battery from BMSBattery

[aaronlim]

why look for a fuse? you were looking for a toggle switch before and couldn't find it either.

did you ever explain what shorted? did it short again a second time when you got this new BMS?

your pack has full voltage, the output of the BMS is half that because of the leakage. if you put a resistor across the leads it may drop to zero. if current flows when you put the resistor on the leads, it will get hot. if it gets hot, your BMS is functional.

i still think the BMS is shut off because the cells are outa spec somewhere. the BMS is behaving normally, nothing wrong with it or the previous one, imo.

if you shorted the output of the battery again then it may have shut off because of the current surge.

The new BMS was installed professionally by an electrician. I don't think he shorted anything i cannot confirm. I was soldering a C14 connector to the output side of the battery and the spark came from there when i accidentally shorted it. I did not unplug the battery from the BMS as at that time it was all sealed up. After the spark, it started to behave like this which is why i thought i destroyed the BMS, but after a new bms its still the same.

[dnmun]

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[999zip999]

Dues it have one of those programable bms's ?

[lcyn]

So my guess is the HVC was set too low when that BMS was programmed, since that was one of the things BMSBattery had to set on my replacement BMS.

If the HVC is set at 50V, then why did the battery come out of the box at 53.8V? I tested the voltage the moment i got it. I then played around with it a little but it was never able to start charging until it was below 50V.

BMSbattery is now telling me to try to reset the BMS by shorting the transistor thingy...I have no idea how to do this. I put a voltmeter on the reset transistor on the BMS and it measures 3.23V even when i have plugged out the battery. I tried using a jumper wire to short it but nothing seems to happen...am i doing it the wrong way?

How does one go about shorting the transistor?? They gave me the same advise, but I do not know how to short it. I do not want to damage anything, so if anyone knows how to do this it would be very appreciated if you could help me.

Thank you

[Rassy]

If the HVC is set at 50V, then why did the battery come out of the box at 53.8V?

I'm not saying my conclusion is correct, just a good possibility. Just because the battery was shipped with a higher voltage there's no expectation on my part that the BMS they installed on the battery was actually used to charge the battery.

In fact, the battery cells were probably fully charged prior to the installation of the BMS. I've noticed that my battery can sit for weeks without losing significant voltage. Right now it hasn't been used for a week and a half and I just checked and it's at 53.9V. When the charger is plugged in at these voltages nothing happens. Once it is used a little and then plugged into the charger I think the charger pushes it up a little over 54V before shutting off.

[lcyn]

How does one go about shorting the transistor?? They gave me the same advise, but I do not know how to short it. I do not want to damage anything, so if anyone knows how to do this it would be very appreciated if you could help me.

This is the picture they sent. Help.

[TheBeastie]

Did a bit of research on "Lithium (NCM) Nickel Cobalt Manganese - Li(NiCoMn)" batteries and from what I read the main reason the Lithium Cobalt is around is because the original patent on Lithium Cobalt technology has now expired so it should be cheaper and safer for any company to mass produce it with out any legal problems, yeah you can argue legal problems aren't a big problem in China but they still do exist. The Ebike favorite Lithium Iron Phosphate chemistry is the subject of patent disputes.

Li(NiCoMn) is a Tri-element battery, seems like the idea is to combine the three common existing Lithium battery types of "Lithium Manganese", "Lithium Nickel", "Lithium Cobalt" design into what I am calling a "Soup Battery" to get the similar benefits of these different elements into one more chemically stable battery and cut costs.

Got most of this opinion from here http://www.mpoweruk.com/lithiumS.htm
Tri-element cells which combine slightly improved safety (better than Cobalt oxide) with lower cost without compromising the energy density but with slightly lower voltage. Different manufacturers may use different proportions of the three constituent elements, in this case Ni, Co and Mn.