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Testing cells EV battery module
#1
With the tester in the pic where would I test the individual cells voltage in the pic
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#2
Just probe around until you find your way... use your meter to map out the cell position and voltages.

I know its not the same battery but this should give you SOME idea or example of what to do.

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#3
I’ve figured it out.. all cells are within 1 tenth of each other 3.8-3.9.. module has been sitting at 61.6 volts since it was delivered 3 days ago..
very pleased
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#4
Cell voltage has no relationship to a cells capacity.
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#5
No relationship at all... not even if the voltage is at its resting voltage?. I’ve never done a load test on the battery due to it not being installed yet
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#6
(10-05-2019, 08:58 PM)Doin it Wrote: No relationship at all... not even if the voltage is at its resting voltage?

Nope, no relationship at all - it can be used to provide a vague indication of remaining capacity in a cell that you know the capacity of already. 

Don't confuse state of charge and capacity.
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#7
None of the cells are bad tho is what I’m saying since they all have equal voltage.. unfortunately I do not have the equipment needed to test the capacity, so that will be tested once installed
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#8
(10-05-2019, 09:18 PM)Doin it Wrote: None of the cells are bad tho is what I’m saying since they all have equal voltage .....

You are missing my point - an example, last year I purchased a couple of entire 30kWh Leafs, just for the mechanicals, both had in excess of 200k on the clock - usable capacity was just under double figures, so no use for an ESS.

The cells are still all sat at 3.7v - dont assume your cells arent bad, test them - even crudely with a resistive load and a timer.
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#9
What kind of load could I use for the 60v battery?
Is it safe to assume that none of the individual cells are bad (less capacity than the others) if they all have the same voltage?
I was thinking that maybe the entire module could have low capacity but i thought if all the cells voltages match after resting that all the individual cells are of similar capacity
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#10
(10-05-2019, 09:45 PM)Doin it Wrote: What kind of load could I use for the 60v battery..

Anything electrically resistive, with a resistance to suit the rate at which you want to discharge.

(10-05-2019, 09:45 PM)Doin it Wrote: Is it safe to assume that none of the individual cells are bad (less capacity than the others) if they all have the same voltage?
I was thinking that maybe the entire module could have low capacity but i thought if all the cells voltages match after resting that all the individual cells are of similar capacity

All cells being at the same voltage simply indicates that  they are well balanced, you are safe to assume that - again, voltage is not an indicator of capacity.

A cell, or many cells, being at differing voltages simply indicates an imbalance - without testing capacity, balance is all you can safely assume.
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