I've seen the black epoxy on various pcbs to encapsulate it. I've also seen plenty of times a Clear coating. But this is my first time seeing this yellow stuff? Any idea what it is?
Thanks confirming. This is exactly what I was thinking.
Is there a way to calculate R1 R2 and R3? If you can estimate the length between the two points? I'm not sure if
$$R = \frac{\rho\;L}{Wt}$$
Can also be used if I don't consider the whole length, but only between two points on the...
Theoretical thought experiment, trying to evaluate batteries in parallel, connected with non ideal conductors that have same current draw? Trying to understand the concepts here.
If I have three identical cells. Fully charged. Same age. Charged and discharged the same amount of times. Each cell...
This may have been a whole simpler that I had thought! The only problem is that the answer I'm getting below seems to be independent of the current, and only dependent on the internal resistance. This is very confusing to me. See below.
So if the cells are supposed to be the limiting factor...
Great advice. Is "8A" 8 amperes, or the hexadecimal value 8A, or 8 times the variable A? If "8A" is allowed to represent 8 Amperes there are three options, when a space is forgotten between number and it's unit
Where "8 A" is crystal clear, 8 Amperes, only has one meaning. Is why space is required.
Perhaps, but I'm not sure that my logic in post number 62 holds water? I'm not sure that I can assume the temperature of the strip would be 60 deg C, while the temperature of the cell is 51 deg C? Because this would result in heat transfer occurring between the strip and cell. If we want the...
UPDATE: Like others have mentioned, I completely disregard the heat transfer from to/from the cell. I may been overthinking this problem.
So for a randomly chosen 21700 cell. 50S, in a 3P5S pack, continuous discharge from the pack of ##30 A##.
The temperature of the strip ##T_{S}## is greater...
Finding the power dissipated in a strip is easy. But I am wondering how many Watts dissipated by the strip is considered "to much" because of the amount of heat?
Yea I do think there is some convection in the battery pack. There's not much for an air gap, but it is still present. I wanted as...
Hey thanks. I've seen that commercial power tool battery packs:
Appears to use at most 0.2 mm thick nickel, and very uncommon I have seen 0.3 mm thick. Appears to be about 10 mm wide or so. I'll also note that the majority of he nickel is in the "vertical" position with regards to the LW and Lt...
Thanks for the responses!
I'm asking this question, to attempt to apply a more practical application of the theoretical concepts learned from the oversimplified question asked, of how to theoretically calculate how much current can go through a strip of nickel strip in a battery pack in order...
Sorry for not showing this properly.
One one side you have something like this. On the other something like shown in the other figure. Theoretical thought exercise only here to understand concepts:
Assume that the copper bus bar in the second figure is nickel. This gives me a 5P2S pack.
The...
Thanks for your help through this process! Defiantly learned a lot through it. Seems like the generic equation is:
$$I = \sqrt{\frac{T_{1} - T_{\infty}}{R\sum_{}^{} R_{T}}}$$
Where R is the resistance of the strip, and RT is the thermal resistance.
Once conceptual question I have is shown in...
Note you may have to scroll to the right to see the full equations.
I see. Thanks for pointing this out! so I think it's something like this give, this guidance.
Using the image above, and ignoring any insulation, conduction from the bottom of the strip to the box.
Power generated in...