Reference 1 has many continuous discharge curves for this cell from 0.2A up to 20A continuous.
The DCIR was measured by Popp et al [6] at 3 C-rates and at different temperatures. The DCIR values were taken 0.5s into the pulse and have been plotted below versus temperature.
The product data sheet specifies 500 cycles at C/3 charge and C/3 discharge between 4.2V and 2.85V, hence 100% to 0%.
The EU collaborative project iModBatt [Reference 5] has tested and cycled a number of cells.
This data shows that the M50 cycle life decrease rapidly when charged above 1C.
Chang-Hui Chen et al [7] used this cell to develop the cell teardown, analysis techniques and subsequent mathematical models. The table below comes from this paper and lists some of the physical parameters for the Cathode, Separator and Anode.
Gas Pressure Post Formation – Gulsoy et al [1] developed a technique to measure the accumulated pressure within the cylindrical cell post formation, the cell in question was the LG INR M50. The method involved opening the cell and inserting a sensor without incurring a loss of pressure. A bespoke test rig was designed to achieve this. Three cells were tested and the average gas pressure was 260 mbar.
Gas Pressure vs SoC – Gulsoy et al [1] show the gas pressure versus SoC for an LG INR M50 cell and Hemmerling et al [2] show the gas pressure versus SoC for an LG INR MJ1 cell.
Internal gas pressure of instrumented cells with respect to 0% SOC during the processes of (a) charging with C/3 rate and (b) discharging with 1C rate at different ageing stages
Engineering samples have been out for a while and I tested them for my Patreon supporters a few weeks ago. Other testing is ongoing and eventually I’ll post some of the results publicly.
I don’t expect any production P50B’s to be available until at least the end of the year and most likely next year. Perhaps some of the samples will pop up here and there before then though.
They’re very good performing cells, as would be expected.
You might get back one volt of that back by going to P50B’s (next year) but a lot of your drop could be in the welds, nickel strip, series connections, wiring, and connectors and changing cells won’t help with that unless the pack is built differently (better) next time.
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For the two reasons I already described, it’s of very little use to us.
But it seems you’re very confident of your stance on this, expressed via your dismissive LOL. So tell me then, what would the AC IR tell us that’s so much better than what the DC IR tells us?
Because it tells me how much charge is stored in a cell, which allows me to estimate the range I can get from a battery pack.
Why are you answering my question with a question? Why is AC IR so important to you that you would insult a valued member of our community? What information is that testing/comparison giving you?
“Im incapable of gathering a useful reference point so instead im gonna bitch and moan that you should conform to my asinine test instead”
You gonna ask honda to measure “how many pizza hut runs can i do on a tank of gas” instead of mpg next?
I don’t know anything about you or why you do what you do. That is why I asked you questions. While someone accusing me of knowing more than I do could be considered a compliment I suspect your comment was meant to be something less than that.
Comparing is important and I can do that with DC IR. I can also calculate the initial voltage drop under load using DC IR. You are unable to use AC IR for anything but comparing AC IR (if you do the tests properly).
I accept that knowing AC IR is important to you but that has nothing to do with what’s important to anyone else. Especially when other performance characteristics give us more information.
I don’t need to test a damn thing for you. Who the hell do you think you are to say something that selfish?
Of course I’m trying to increase the support I get via Patreon! My patrons are frakkin’ awesome and are the ones who make it possible to take some time off from my day job work in order to do testing. The more support I get the more testing I can do. You are free to not do so but don’t expect some kind of special treatment just because of your self-entitlement.
I have spent many, MANY thousands of dollars of my own money and thousands of hours of time testing for years…years. I answer up to several dozens of questions PM’d and emailed to me every day from non-patrons. All this for free. What have you done for the different communities?
Fake P50B? Prove it.
You want to cross the line and get personal, to assault my integrity? Then you better have the evidence to back up your accusation. But you don’t have a damn thing. And all we’re left with is wondering why you’re behaving like a spoiled child.