izeman
1 GW
my reason i'm asking is because i'm rebuilding my lipo pack. i got a 12s4p 5000mAh pack installed, and got another 10x 6s packs lying around. so what i did was opening up the packs, and soldering a 12awg battery wire directly to the battery tabs. one after the other. then i charged this single cell with my icharger at 2c and discharger with 4c. the packs sees 3c max under regular conditions. so i got 18x 6 = 108 capacity readings.
i then rearranged the cells in 4p groups to form even capacity groups. they are now between 4.750 and 4.785, so quite close.
as you may know those cells have nickle plated tabs on negative side and alluminium tab on the positive side. you need a special flux to solder this aluminium tab. the orginal battery has the tabs spot welded together. i can't do that, so i had to solder them.
the question now is: how much will this soldering job differ from the welding? will it be any weaker?
will the solder have a higher resistance? if so: is it noticeable, and how much?
and how far do the tabs need to overlap? or don't they need to overlap at all? i think it's not needed, as the cross section of the tab is minimal. it's about 0.2mm thin and 10-15mm wide, so it's probable 2-3mm2.
any help much appreciated.
i then rearranged the cells in 4p groups to form even capacity groups. they are now between 4.750 and 4.785, so quite close.
as you may know those cells have nickle plated tabs on negative side and alluminium tab on the positive side. you need a special flux to solder this aluminium tab. the orginal battery has the tabs spot welded together. i can't do that, so i had to solder them.
the question now is: how much will this soldering job differ from the welding? will it be any weaker?
will the solder have a higher resistance? if so: is it noticeable, and how much?
and how far do the tabs need to overlap? or don't they need to overlap at all? i think it's not needed, as the cross section of the tab is minimal. it's about 0.2mm thin and 10-15mm wide, so it's probable 2-3mm2.
any help much appreciated.
