3S10P Battery pack case

thingiverse

I designed another battery pack case (yeah I have a thing for 18650's and a pretty much free supply of them) that can hold thirty 18650 cells in either three series ten parallel or ten series three parallel configuration. The lid and body are meant to snap together but be sure to add plenty of glue since this thing full weighs over one point five kilograms and you don't want a theoretical two hundred amps of current to break free. Now this is the part where I have to talk about safety. Use a BMS! Remember the next three words: Battery Management System-BMS. Get one which handles charging as well as overcurrent protection and others. I added a male XT60 for discharging and a female XT60 port for charging. There are two switches on there (standard rocker/toggle). One controls the OUT and the other the IN. Most Chinese-based BMS's have the charging and output terminals wired in parallel which means even when not charging the female XT60 will have voltage. Hence the switch to turn it off. You can also decide to charge and use at the same time or switch the OUT low. The hole between the switches is for a pushbutton which connects battery voltage to a capacity meter so you can check the juice left. Make sure you know around 18650's before building a pack like this. You can fail but probably only once...sarcasm. Always ensure proper insulation. Enjoy ;)\r\n\r\nEDIT May twenty ninth two thousand nineteen:\r\n-I added the step file if anyone wants to modify it for their own use.