Barbar0ssa
New Member
- Joined
- Mar 3, 2021
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- 80
Now I need to re-think bus bars. The previous ones won't fit the heavily-bloated cells. Maybe I should make some out of copper pipe?
or use a press. copper is soft metal. It will become as flat as the surface you press it against.I bought copper bar stock. .125 x .75. Think it will handle 300 amps since it is 1 mil thicker than the busbars that come with the cells.
To me beating a copper pipe flat still won't be perfectly flat because of the imperfections. Only the high spots will be making contact.
215A according to this chart that I useI bought copper bar stock. .125 x .75. Think it will handle 300 amps since it is 1 mil thicker than the busbars that come with the cells.
To me beating a copper pipe flat still won't be perfectly flat because of the imperfections. Only the high spots will be making contact.
Now I need to re-think bus bars. The previous ones won't fit the heavily-bloated cells. Maybe I should make some out of copper pipe?
The two most common sized busbars supplied with these cells are 15mm Wide x 2mm Thick or 20mm W x 2mm Thick.I just did some measuring and my original bus bars are only 16mm. They will be limited to about 70a. I think pipe is probably the way to go as even 1/2" pope is several steps higher rating than what I had.
This, 100%.I agree with pretty much all of that .... but would add that one of the things that causes the cells to be damaged during top balance is loss of patience .... so lets crank up the voltage on the power supply a little to speed things up.
The other thing is .... hey, I'm not getting anywhere near as much current as I should be .... so, lets crank up the voltage a little to get more current.
I was having problems with getting the current I should be from my power supply .... replacing the crappy alligator clips pretty much doubled my current.
I am definitely an inpatient person, but it kills me to see people cranking up the voltage, when, most of us spent hundreds, if not thousands of dollars on cells. I bought a second bench power supply, so I could charge at 2x the speed. It's a very small cost considering what I spent on the system..... one of the things that causes the cells to be damaged during top balance is loss of patience .... so lets crank up the voltage on the power supply a little to speed things up....
I was concerned about expansion, so I made these for my 2P4S bank. Might work for you.Now I need to re-think bus bars. The previous ones won't fit the heavily-bloated cells. Maybe I should make some out of copper pipe?
amazing!!!!!!!!I was concerned about expansion, so I made these for my 2P4S bank. Might work for you.
I was concerned about expansion, so I made these for my 2P4S bank. Might work for you.
I really like your bus bars!I was concerned about expansion, so I made these for my 2P4S bank. Might work for you.
I really like your bus bars!
Could you please provide a bit more explanation about:
(i) how you sandwiched the braided cable between what appears to be aluminum flat stock (I am wondering if you squeezed the sandwich using a conventional bench vise or used a press and die),
(iii) what is the material of the cables (stainless?)
(ii) how the BMS studs are affixed to the bus bars by what appears to be bolts or screws with the heads under the bus bar (I am wondering about clearance between the bottom of the bus bar and the cell )?
Thank you!
so glad to hear of this development ?Almost all the bloating went down! This is unbelievable! View attachment 66312
How long did you leave them compressed?Almost all the bloating went down! This is unbelievable! View attachment 66312
They are made of tin plated flat braided copper that I bought off of ebay at the following link -> https://www.ebay.com/itm/293492808117I really like your bus bars!
Could you please provide a bit more explanation about:
(i) how you sandwiched the braided cable between what appears to be aluminum flat stock (I am wondering if you squeezed the sandwich using a conventional bench vise or used a press and die),
(iii) what is the material of the cables (stainless?)
(ii) how the BMS studs are affixed to the bus bars by what appears to be bolts or screws with the heads under the bus bar (I am wondering about clearance between the bottom of the bus bar and the cell )?
Thank you!