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4s6p battery holder

(Gwa Gwa) #21

I have been working on a similar project. PCBs are on the way.

http://dirtypcbs.com/store/designer/details/8265/6262/top-zip
http://dirtypcbs.com/store/designer/details/8265/6261/bottom-zip

I have a 3d printed canister that they fit in that uses M3 screws to hold it all together.
These are the springs I am using: https://www.mouser.co.za/ProductDetail/Keystone-Electronics/211-D?qs=%2Fha2pyFadui9q4JttDHta7ui%2B%2FLDVmbiwU8jRQ1OBRE=

(Etienne Demers) #22

looks pretty much the same as mine.

PCBs are also being printed. Let me know how it works :slight_smile:

(Doug) #23

Would it be possible to sleeve two cells inline and eliminate contact pins in middle? With spring contacts on ends this would be very economical.

(Etienne Demers) #24

Vibration and contact is the bulk of the problem. This is why the springs are necessary.

I am getting sample pogo pins to make some tests, would need to order 5000 for it to be economical…

(Etienne Demers) #25

Ok so with the expensive price of the pogo pins and the machining of all the parts. I can sell this harness for about 500USD.

Not sure if anyone will be interested at that price but I will make a couple for myself…

Cheers,
E.

1 Like
(Etienne Demers) #26

Received my parts today and went ahead with the pogo pins as I cannot get current rating for the springs.

Missing the PCB but will rig something up for testing.

3 Likes
(Etienne Demers) #27

First prototype completed and tested. The only downside is it needs to be fitted in the longer 298mm acrylic tube. But considering the benefits of being able to power the ROV while travelling, I think this is a win.

After running a few charger cycles at 20A the unit is not overly heating up. This appears to be a success.

Will run more tests in the tank.this week.

4 Likes
(Gwa Gwa) #28

That is looking great. What is the expected max current draw from the ROV?

(Etienne Demers) #29

Depends what you have got installed, at what % your running etc.

BR uses 90a cable from the battery housing and I think a 100a current sensor off the top of my head.

In reality, this high current draw is mostly in bursts.

I think 20a on average with the charger is higher than reality which is why I thought it was a good test.

My batteries last me between 2 and 4 hours depending on what I’m doing. that’s about 4.5 to 9a average…