diy solar

diy solar

The secret to compression

Fire retardant is of secondary importance to me.

Getting the right durometer, thickness of material, and appropriate amount of compression percent on the pad to achieve desired psi is toughest part.

Red silicon rubber pads are low cost and checks many of the requirement boxes, even pretty good fire resistance rating
Do you have a link or brand of red silicone rubber pads you’re referring too? Been reading a lot about compression etc, looking at options for pads/rubber between cells. Some people are using thin plastic cutting board material. I like the idea of fire resistant, flexible materials between cells.
 
The thing is when the battery cell is low on charge it is concave between the terminals and when fully changes it expands and convexed between the terminals.

So is a straight bit of wood either end under force be enough? Does it need compression when low in charge and at what pressure, I say this because most builds are 2 blocks of wood and threaded bar that only compresses the terminals when in low to med charge and the terminals don't expand even when fully charged.. it's the bit in the middle that does..

So many unknowns lol.. what shape should the form be for compression?
 
Has anyone actually contacted a manufacturer and talked to them about this topic?
Yes.

 
it's the bit in the middle that does..
Which is why you just need flat something on both sides keeping the middle from bulging. Ideally keeping the force at around 11psi which is why people have been using springs so that it does allow some movement while still keeping constant pressure. Using this type of foam should theoretically provide same as the springs.
 
Yes.

Interesting read.

I can not see it been hard to make a Arduino based compression system making use of sensors and a linear actuator to provide different pressure at different temperatures and different levels of charge.
 
Interesting read.

I can not see it been hard to make a Arduino based compression system making use of sensors and a linear actuator to provide different pressure at different temperatures and different levels of charge.
Springs will do that without all the extra complications ..... might be a fun project though.
 
So will the poron foam that's designed for this.

Only it'll be even simpler.

I'll be convinced of that when I see more controlled experiments done with the foam like has been done with springs.
Will the pressure remain constant across the whole SOC with an 4S, 8S and larger pack? There could be overall 4 mm of movement with an 8S pack .... So, time will tell.
It might be my new favorite way to do compression, but right now it's still in the theoretical phase.
 
I'll be convinced of that when I see more controlled experiments done with the foam like has been done with springs.
Will the pressure remain constant across the whole SOC with an 4S, 8S and larger pack? There could be overall 4 mm of movement with an 8S pack .... So, time will tell.
It might be my new favorite way to do compression, but right now it's still in the theoretical phase.
But that's literally its application.

Of course its not constant across the whole soc. But springs aren't either.
 
But that's literally its application.

Of course its not constant across the whole soc. But springs aren't either.
Springs can easily keep the pack within 1 or 2 PSI across the whole SOC .... I'm not trying to get in a pissing match about this ... but seems you are itching to.
 
Springs can easily keep the pack within 1 or 2 PSI across the whole SOC .... I'm not trying to get in a pissing match about this ... but seems you are itching to.
Only by oversizing them a fair amount to keep their range of compression low.

We can do the same with the foam if you buy a thicker sheet. It has a "spring rate" as well.

If you think these comments are a pissing match then I can't help you there. I'm simply presenting the alternatives to adding a bunch of clunky hardware made of steel to a battery.

The same thing required from springs can be achieved with the foam is all.
 
Only by oversizing them a fair amount to keep their range of compression low.

We can do the same with the foam if you buy a thicker sheet. It has a "spring rate" as well.

If you think these comments are a pissing match then I can't help you there. I'm simply presenting the alternatives to adding a bunch of clunky hardware made of steel to a battery.

The same thing required from springs can be achieved with the foam is all.
I'm not going to discuss this with you here ... it's the wrong place.
Go ahead and have fun presenting inflammatory incorrect information .... Have fun arguing with yourself.
 
I'm not going to discuss this with you here ... it's the wrong place.
Go ahead and have fun presenting inflammatory incorrect information .... Have fun arguing with yourself.
Lmao that foam is literally the topic of this thread.

Posting something you don't agree with isn't being inflammatory. You're just mad someone isn't agreeing with you and getting openly upset by it.

Nothing about what I stated was incorrect. The compression force rate is a known factor for this material and its explicitly designed for this batteries.
 
So will the poron foam that's designed for this.

Only it'll be even simpler.
I bought some off ebay, enough drop pieces to do two 48v packs and two 12v packs. The dude was willing to deal. It arrived the other day, very similar to what I previously used on my 24v pack. Size is very close to cell size also.
 
I bought some off ebay, enough drop pieces to do two 48v packs and two 12v packs. The dude was willing to deal. It arrived the other day, very similar to what I previously used on my 24v pack. Size is very close to cell size also.
Link?
 
@Bob B Any suggestion for how I could test the foam? Springs seem a lot simpler to test as cinergy did since you have single point of compression whereas with the foam between all cells and sides I am wondering how to better test this.
 
Back
Top