Awesome, so you are going to have basically 5 separate packs that you connect with bullet connectors to make the full pack? How do you plan on soldering the bullet connectors on? Are the nickel strips in the middle going to be longer so you can bend them without breaking them? How do you plan on putting each group of 4 in parallel with the strips, just in a circle kind of with the strips? Also, please please please take as many pictures as possible so I can understand exactly how you are doing this so I can do it myself! Best of luck!
That’s correct each of the 5 packs would have 3.7v * 2 packs * 3Ah * 4 parallel cells = 88.8Wh (maximum permited is 100Wh), that’s considering you are going with a Samsung 30Q
You just need mount the bullets over the previouslu spot welded or iron soldered nickel strip and use flux and solder to weld the male and female bullets between packs.
Just solder the 4 negative first and then the 4 positive leads with nickel strips, then you will have a pack of 4 in parallel.
Thanks for all the info! Really helped. However, I have one question, to put the cells in parallel it would be like this right? With the lines being the nickel strip?
He also drilled the enclosures for screws, switch and battery plug (I will add pictures of that later).
For now I have all the parts (except the remote…) so the build will move on pretty quickly.
Again thank you @pyttroll for the invaluable help! Can’t wait to have a ride together once it is done.
I started adding the same color Dupont wire on the BMS. After that I took a break and will continue today.
Next step is to solder the charger, the switch and the BMS together and find a way to place them in the case.
Also I’m currently mounting the motor on the back of the longboard.
Nice, what do you mean when you say “Dupont” wires for the balance wires? Also wouldn’t not soldering the bullet connectors defeat the purpose of making a pack that can be split up to go on an airplane? Also, was the nickel strip hard to bend to get the cells like that and what nickel strip did you use? Sorry for all the questions but I am very curious!
@rok I had to bend them like that according to the drawing few post before.
what do you mean when you say “Dupont” wires for the balance wires?
It’s a type of pluggable wires called dupont wires (google dupont wires). I used them for the B-…B1+…B9+.
Also wouldn’t not soldering the bullet connectors defeat the purpose of making a pack that can be split up to go on an airplane?
Totally, but I was not confident enough to solder the bullet connectors without breaking anything. Since it will take the airplane most likely one time I can still remove the nickel strip that are in place of the bullet connectors.
Also, was the nickel strip hard to bend to get the cells like that and what nickel strip did you use?
No, extremely easy to bend. It’s pure nickel strip that @pyttroll lent me.
Also, can I see some more pics of where you decided to spot weld instead of solder bullet connectors?
Okay I will add more pics of the battery pack later today.
For now, I’m in the process of soldering the switch, BMS, the charger and the cables to will go above the board. I’m very near completion.
I started mounting the mount with the motor.
Switch: