"new" model LG INR18650 HG2L

vapcell_Dennis · 2019-09-10T09:43:39.000Z

we sell the HG2L battery，have enough stock

RobertB · 2019-09-10T10:19:22.000Z

vapcell Dennis:

we sell the HG2L battery，have enough stock

What are your test results? Is it equivalent to a VTC6, or just a plain HG2?

vapcell_Dennis · 2019-09-10T10:25:54.000Z

RobertB:

vapcell Dennis:

we sell the HG2L battery，have enough stock

What are your test results? Is it equivalent to a VTC6, or just a plain HG2?

This is the HG2L produced at the end of 2017, similar to the performance of LG HG2 in the same period.

At present, LG HG2 technology continues to improve, capacity and power are improving.

So the performance of LG HG2L is slightly worse than that of LG HG2 in 2019.

RobertB · 2019-09-10T10:43:26.000Z

vapcell Dennis:

RobertB:

vapcell Dennis:

we sell the HG2L battery，have enough stock

What are your test results? Is it equivalent to a VTC6, or just a plain HG2?

This is the HG2L produced at the end of 2017, similar to the performance of LG HG2 in the same period.

At present, LG HG2 technology continues to improve, capacity and power are improving.

So the performance of LG HG2L is slightly worse than that of LG HG2 in 2019.

Thanks Dennis. Thats what I thought, a LG cell designated for a tool company. Just like the (yellow) LG HE4 was for Bosch cordless tools, with identical performance to the (red) HE2, except that it was supposed to be able to handle heat a little better

Pajda_cz · 2019-09-12T11:04:37.000Z

So LG HG2L samples from Nkon arrived today. One major difference which I think was not mentioned earlier is that HG2L have bottom vent. I already started some initial tests with older (but not used) HG2 sample running on the next channel of my battery tester. I hope I will post the results this weekend.

RobertB · 2019-09-12T11:23:32.000Z

Pajda cz:

So LG HG2L samples from Nkon arrived today. One major difference which I think was not mentioned earlier is that HG2L have bottom vent. I already started some initial tests with older (but not used) HG2 sample running on the next channel of my battery tester. I hope I will post the results this weekend.

Lets see a picture of that bottom vent. Never seen that in an 18650 before

Pajda_cz · 2019-09-12T11:36:32.000Z

RobertB · 2019-09-12T12:23:21.000Z

Pajda cz:

I don’t think that is a vent on the bottom. Vents are on the positive end

Pajda_cz · 2019-09-12T12:39:12.000Z

Yes it is really so called bottom vent, you can read some study about it for example in this document starting from page 43 https://ec.europa.eu/jrc/sites/jrcsh/files/eric-darcy-nasa-lessons-learned-passive-thermal-runaway-propagation-resistant-designs-spacecraft-batteries.pdf

RobertB · 2019-09-12T13:58:57.000Z

Pajda cz:

Yes it is really so called bottom vent, you can read some study about it for example in this document starting from page 43 https://ec.europa.eu/jrc/sites/jrcsh/files/eric-darcy-nasa-lessons-learned-passive-thermal-runaway-propagation-resistant-designs-spacecraft-batteries.pdf

Ah ok. Interesting article. It’s a weakened area on the bottom. Not the primary vent, but if the cell were to build enough pressure to explode, it would separate at that disk instead of splitting the sides. Always wondered what that ring was for I’ve seen on various cells.

Lishen 21700

Lightbringer · 2019-09-12T15:41:37.000Z

RobertB:

Ah ok. Interesting article. It’s a weakened area on the bottom. Not the primary vent, but if the cell were to build enough pressure to explode, it would separate at that disk instead of splitting the sides. Always wondered what that ring was for I’ve seen on various cells.

Yeh, radial electrolytic caps often have an ‘X’ scored into the bottom in case they blow.

via

en.wikipedia.org

Electrolytic capacitor

An electrolytic capacitor is a polarized capacitor whose anode or positive plate is made of a metal that forms an insulating oxide layer through anodization. This oxide layer acts as the dielectric of the capacitor. A solid, liquid, or gel electrolyte covers the surface of this oxide layer, serving as the cathode or negative plate of the capacitor. Because of their very thin dielectric oxide layer and enlarged anode surface, electrolytic capacitors have a much higher capacitance-voltage (CV) pr...

Lightbringer · 2019-09-12T15:46:45.000Z

One more…

HydrAxx · 2019-09-15T05:45:19.000Z

Big and happy news: the official datasheet for LGGhem’s HG2L cell is finally available:

https://www.imrbatteries.com/content/lg_HG2L.pdf

But seriously, nothing new, the only data / value that changes in this datasheet compared to that of Brown HG2 is the Voltage Cut-Off operation, it goes from 2.50 Volts to 2.00 Volts, which explains and confirms the rumors and the reports of the sites which indicated a better management of the current during important sag of voltage.

Pajda_cz · 2019-09-15T12:43:18.000Z

Thanks for posting datasheet HydrAxx

After initial tests I can say that there is no significant difference. In fact older “brown” LG Chem HG2 cell sample, manufactured in Dec 2016 seems to be slightly better. I added one sample of HG2L to my cycle life test, but it will take some time to get results.

LG HG2:
nominal capacity: 2.893 mAh
nominal energy: 10.603 Wh
“10s DCIR” at 50% DoD: 27.58 mOhm

LG HG2L:
nominal capacity: 2.852 mAh
nominal energy: 10.422 Wh
“10s DCIR” at 50% DoD: 29.85 mOhm

BlueSwordM · 2019-09-15T15:56:08.000Z

What did you use to measure DC IR?

Did you compensate for the contacts’ resistances?

Pajda_cz · 2019-09-15T18:29:24.000Z

BlueSwordM:

What did you use to measure DC IR?

I am using for DCIR measurement dedicated high-tech battery testers as well as some low-cost testers with proper calibration. But I think more important is to use always the same testing method, because 10 methods = 10 different results. I am a fan of a method which I personally called “10s DCIR”. The main benefit of this method is the ease of implementation, which is very straightforward and can be performed with low-cost equipment or battery testers. So I am not looking for some magic method, but for direct cell comparison under the same conditions.

If you are interested in competitor cells under the same 10s DCIR test:

Sony VTC6: 24.96 mOhm
Samsung 30Q: 24.7 mOhm

BlueSwordM:

Did you compensate for the contacts’ resistances?

Sure

Barkuti · 2019-09-15T20:08:30.000Z

So, basically, nothing worth spending a dime.

By the way, a couple days ago I bought a couple EAIEP 26F cells and submitted them to Henrik. Those are the cells used by the KREOSAN Ukrainian fellows (made by Heter):

If someone wants to do the same with this Lanzhd rewrapped “power” battery cell or any other, do so please. Looks like manufactured by BAK Power.

SKV89 · 2019-09-15T20:51:21.000Z

Damn watching that video was intense! I was nervous watching those guys the whole time! They are some crazy mofos!

docware · 2019-09-16T09:02:52.000Z

Pajda,

can you please describe your 10s DCIR method ? Or link to the specification ?

Pajda_cz · 2019-09-16T10:34:24.000Z

docware:

Pajda,

can you please describe your 10s DCIR method ? Or link to the specification ?

1) charge to 100% via manufacurer spec of “standard charge”
2) rest time 10 min
3) discharge with 0.5C current and 60 min cut-off time (time cut-off condition rather than voltage is by my opinion better approach to find desirable DoD for any chemistry or cell design, in this case it is 50% DoD)
4) 30 min rest time
5) sample OCV
6) discharge with 0.5C current and in 10th second sample the voltage under load.

I do not think that this method is super scientific, the main reason for using it is that it can be performed together with nominal capacity check in one ZKE tester routine (limited to 10 steps) to monitor DCIR rise during cycle life tests.