Recent content by VideoPipeline

Nope Read this: That's about it for me.

I don't know about EVE302 but this thread is about the 280s. The latest LF280K specs don't mention any different unclamped/clamped dimensions, but the specs from 2019 show 0.5mm increase in thickness between 30%SOC & 100%SOC, i.e.: 0.25mm per side or 0.5mm for two adjacent cells: If using cells...

The main thing you may be missing is knowing what the compression curve of any given material looks like. What you want is a foam (or very soft rubber) that maintains a fairly constant compression rate (psi) over a fairly useful range of compression (inches or mm), measured in percentage of...

That's 25 percent compression from original thickness. Do the math. That's 1/4" compressed to 3/16" (compressed by 1/16" or 1.587 mm) Or sixteen 1/4" thick pieces (4" total) compressed to 3” total. Or seven 1/4" thick pieces (1.75" total) compressed to 1.3125” total, e.g.: what you'd have...

re: "Guesstimating compression pressure" Assuming that you have a repeatable assembly process, you could just buy a 300kg shipping scale and then you'd know for sure (pressure = weight reading divided by the area of the side of the cell). Less than $80 on Amazon, e.g.: B08DNYGF7J /...

I think you're looking at the spec for density: 12 lbs/cubic foot. BTW, foam often has a spec. expressed in lbs. per SQUARE foot, but that is just the weight of a given thickness, e.g.: most carpet underlayment foam is upwards of 10-12 lbs. per square foot.

I don't know if this has been mentioned before, but in case it hasn't, If building a rig intended to provide manufacturer's specified "clamping" force to a multi-cell pack (without compressible isolators between cells) using a fixed endplate and a spring-retained endplate, both end plates and...

When in doubt: Read the cell manufacturer's specs/guidelines & comply with them to the maximum extent practical. Pages 2, 3 & 4 of the 3/23/2021 LF280K specs state "under 300±20kgf, 30%～40%SOC" & "Under the 300kgf clamp" but there are no similar entries without that force applied. It seems...

kgf = kg of Force inch pounds or foot pounds are torque or force over distance, not directly applicable in this case. It works out to about 12 psi pressure (optimal) on the wide sides of the cells.

And the LF280K Cycle vs. capacity curve with 300kgf clamping force is much more linear than the 2019 version (maybe two versions back?) with clamping force, which actually lost more capacity over the first ~1500 cycles than without any compression "fixture".