The battery builders club

the 8" aliexpress wheels he bought from maytech and had to forcefully yank bearings out of?

oh good Iā€™m back.

5 Likes

good luck :sweat_smile:

7 Likes

LOL thanks

3 Likes

These things hurt me everytime

Plan it out better?

1 Like

He told me right at the beginning that he was able to ship

I think usps made it quite unclear to him

This time it really wasnā€™t my fault

Either way it seems like all might work out if tomiboi can ship the deck to skyart

Well heā€™s not wrong.

2 Likes

I know he isnā€™t just I guess he thought he could do the battery by it self

Well he can its just gonna cost you 200

4 Likes

25mm wide nickel :grin:

3 Likes

do you have a picture of that maybe?

Not from this build unfortunately. But like this, just bend cells over for 180 degrees:

8 Likes

Nice! I think this is the smartest way. I wonder why there arenā€™t more people doing it this way.

1 Like

Because the folded nickel is very susceptible to work hardening and eventual fatigue failure due to flex/vibrations.

3 Likes

Probably because we donā€™t have massive nickle plates on handā€¦but I might get some for a later day even though I donā€™t have any packs where it would be useful

Iā€™m gonna be making a battery with folded tabsā€¦recommendations to not break them? Itā€™s only a 90 degree bend so probably fine but still

However, folding nickel over the edge of the cell and then soldering wire to it to make the series connection is common.
If you are making a flexible battery, I see why this would be bad practice.
But if you make sure the battery is stiff and not intended for flexible use, there should be no stress on the nickel. You could for example use double sided tape to glue the two sides together to make sure they wonā€™t be flexed.

Whatcha guys think of this? In theory it lets me make 21700 parallel packs with a 15mm wide nickle tab connected to a continuous piece of 10 awg silicone wire. Place the nickle and wire in, solder; place the cells in, weldā€¦call it a day

Idea is 10 exact copies of 1s3p 40T blocks with 5.5mm bullet terminations along a single wire and a breadboard pin for balance. I can make the BMS have a pair of bullet inputs and an XT90s output with the wire nest of the balance leads as a 11 pin JST to 11 breadboard pins. When I swap the deck out I can just reconfigure the battery without hassle

The nickle folds over the cell so the wires are all on the top, it makes the footprint as small as possible with each parallel pack fully insulated (will have shrink wrap on the long end of the cells to protect the nickle, then another along the short side to make it pretty)

Whatcha guys think?

2 Likes

Sometimes too much material is not a good thing. For carrying current? this is great. But some flexibility is good in a system that is prone to high vibrations. The stress needs to go somewhere. In nickel strips, the strips are flexible enough to give for vibration. In a plate that stiff, the stress now goes to the weakest point, which is now the weld spots. This is not as desirable.

2 Likes