ReddyKilowatt
New Member
I won't post the whole discussion just now, but here's my latest interaction with GPT on the question "can you translate torque to pressure?"
I told it I am using 1/4 inch 20 thread-per-inch (quarter-twenty) bolts. The EVE MB31 cell faces are about seven by eight inches.
I told it I wanted 12 PSI.
Even if the below is correct, I still need to clarify what state of charge EVE is talking about with their pressure recommendation. I think it is 50% but I am going to write Docan asking for them to ask EVE about this.
Me: The area is 56 square inches, not 80
First, calculate the total clamping force needed:
56 in2×12 PSI=672 pounds
With four bolts sharing the load:
Force per bolt=672 pounds/4=168 pounds per bolt
Using the torque formula:
T=K⋅F⋅D
T=0.2⋅168⋅0.25=8.4 inch-pounds
Each bolt should be tightened to about 8.4 inch-pounds to achieve 12 PSI across the end plates of your LiFePO4 cell array. How’s that looking for your setup?
I told it I am using 1/4 inch 20 thread-per-inch (quarter-twenty) bolts. The EVE MB31 cell faces are about seven by eight inches.
I told it I wanted 12 PSI.
Even if the below is correct, I still need to clarify what state of charge EVE is talking about with their pressure recommendation. I think it is 50% but I am going to write Docan asking for them to ask EVE about this.
Me: The area is 56 square inches, not 80
Copilot
Alright, let’s do the math for the updated area.First, calculate the total clamping force needed:
56 in2×12 PSI=672 pounds
With four bolts sharing the load:
Force per bolt=672 pounds/4=168 pounds per bolt
Using the torque formula:
T=K⋅F⋅D
T=0.2⋅168⋅0.25=8.4 inch-pounds
Each bolt should be tightened to about 8.4 inch-pounds to achieve 12 PSI across the end plates of your LiFePO4 cell array. How’s that looking for your setup?
