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Building Solderless battery pack
#11
Do you happen to have some more images, perhaps larger and different angles?
Proceed with caution. Knowledge is Power! Literally! Cool 
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#12
Thanks BlueSwordM
The material doesn't cost a lot actually... The reason is costly is each plate is CNC milled. And each plate is estimated to have 150-200 big & small holes/slots... some is with threaded. There're 5 plates in total for each pack. So a lot of work and cannot make any mistake. Failure rate is high.
I love the quality of CNC, it makes the pack look professional.
My first prototype was using 28P, too small and too much pack needed to build a full blown powerwall. The cost will be even higher. More cells within a pack will drive down the cost/cell calculation and less work overall.

(01-25-2019, 03:03 AM)Korishan Wrote: Do you happen to have some more images, perhaps larger and different angles?

This is a pack assembly video I did a few days back. Will be better to see how the process is...

416 OFPPK Assembly



Another test I did on the pack is to test the vibration... yes is not scientific, I'm looking at normal usage.
Pretty stable..

Vibration Test

Let me know any areas I can look into...
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#13
(01-25-2019, 03:03 AM)Dan Lim Wrote: Thanks BlueSwordM
The material doesn't cost a lot actually... The reason is costly is each plate is CNC milled. And each plate is estimated to have 150-200 big & small holes/slots... some is with threaded. There're 5 plates in total for each pack. So a lot of work and cannot make any mistake. Failure rate is high.
I love the quality of CNC, it makes the pack look professional.
My first prototype was using 28P, too small and too much pack needed  to build a full blown powerwall. The cost will be even higher. More cells within a pack will drive down the cost/cell calculation and less work overall.

(01-25-2019, 03:03 AM)Korishan Wrote: Do you happen to have some more images, perhaps larger and different angles?

This is a pack assembly video I did a few days back. Will be better to see how the process is...

416 OFPPK Assembly



Another test I did on the pack is to test the vibration... yes is not scientific, I'm looking at normal usage.
Pretty stable..

Vibration Test

Let me know any areas I can look into...

The pre-order is closing on Feb 8, those interested may want to reserve your unit.
Thanks
Dan
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#14
Two days more before Pre-Order Close..
Still have some slot available.
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#15
(02-06-2019, 11:41 AM)Dan Lim Wrote: Two days more before Pre-Order Close..
Still have some slot available.

Love the idea. Will the price come down any with volume production?
Any plans to increase cell numbers maybe to at least 100p?
Don't know if that many is feasible in this type of system.
For my planned powerwall I would have to buy at least 42 of them if not 56.

Still a great concept for a 12V system.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 70mΩ or less Smile
Last count as of 3/22/2019
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Cells  >80% of Capacity        2389
Cells <80% of Capacity         1265
Cells ≥2200mAh & ≥ 80%     1653
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#16
(02-06-2019, 05:22 PM)Wolf Wrote:
(02-06-2019, 11:41 AM)Dan Lim Wrote: Two days more before Pre-Order Close..
Still have some slot available.

Love the idea. Will the price come down any with volume production?
Any plans to increase cell numbers maybe to at least 100p?
Don't know if that many is feasible in this type of system.
For my planned powerwall I would have to buy at least 42 of them if not 56.

Still a great concept for a 12V system.

Wolf

Hi Wolf
Thanks for your interest...
Currently this is still in pilot run stage, is a small run. Yes, definitely we're looking ways to bring down the cost. We need some support.
Yes, we'll consider bigger pack for future ideas.

If you're interested in getting 40+ pack, send me a message or email. 

Yes, can be used on any configuration, just series or parallel. 

Thanks
Daniel
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#17
Last 24 hours before pre-order closed.
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#18
Those who's interest can send me a message, we can do built-to-order if there's a quantity.
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#19
Very good job. It doesn't look easy to home-build.

For the experienced ones: what could be wrong with just using 2 plates with springs as connecting option ?
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#20
Springs will get weak over time
Don't provide constant pressure over a large area
Have high energy losses thru resistance
Most are chrome plated steel or nickel plated steel

There are some that are good. Beryllium springs have good retention and low resistance. They cost more, too.

"If" the springs have plates that make contact with cells then they would probably work. Think of the plate/spring assembly backwards or the spring is sandwiched between 2 plates. But this only solves part of the issue, there's still retention issue and if the plates aren't directly connected with a separate wire then resistance is still am issue too.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)

Kickstarter: Honest STM32F103 based dev Boards
Patreon: Korishan
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