BMS for 10S lithium pack

[PanSam1986]

Hi all,

I am having trouble finding a BMS for a 10s pack I want to build with a max 5A rating or less. I have 21700 unprotected cells for this project. I was contemplating using 10 1s bms boards + balancing board but I’m not really sure if that would work. The only other solution I can think of is getting a 15A rated 10s bms and connecting a 5A PTC fuse in between. I have never built a lithium pack before so any help would be greatly appreciated.

[NiHaoMike]

Replace the current sense resistor with one of 3x the resistance.

[tekguy]

dont use an mot transfo type tab welder,i made one with a ssr switched primary and a dual pulse timer,it just cooked the cells never welded the nickel,then got a cheap chinese car battery powered welder,that had the fets short on first use ,did the mods as in this vid,now works great from a 30ah car battery. i got this one

[PanSam1986]

@NiHaoMike Thanks, makes sense.

@tekguy I actually purchased 21700 cells with pre-installed copper tabs just so that I wouldn’t have to do it myself.