Cycle life tests of High Energy density cylindrical cells
- Thread starter Pajda
- Start date
Pajda
10 kW
Small update
Update:
- updated 5300mAh+ charts 100% DoD
Unfortunately, I still can't get any more samples in the "58E" category. Typically, EVE 58Es are still not in mass production according to the information available to me, and a zillion amount to be ordered from BAK.
Update:
- updated 5300mAh+ charts 100% DoD
Unfortunately, I still can't get any more samples in the "58E" category. Typically, EVE 58Es are still not in mass production according to the information available to me, and a zillion amount to be ordered from BAK.
Pajda
10 kW
Small update
Update:
- updated 5300mAh+ charts 100% and 90% DoD
I have finally managed to find a supplier for the FEB 21700-6000, so hopefully we can start testing within a month. I would also like to retest the BAK CD53
Update:
- updated 5300mAh+ charts 100% and 90% DoD
I have finally managed to find a supplier for the FEB 21700-6000, so hopefully we can start testing within a month. I would also like to retest the BAK CD53
Pajda
10 kW
So the FEB 6000mAh won't be tested anytime soon. After ordering, the supplier remembered that he didn't actually have it in stock, and he wouldn't even stock it anymore because there were many complains about the quality in both the consistency of production and the actual parameters. So I pick Samsung 50S2 instead.
Pajda
10 kW
Small update
Update:
- updated 5300mAh+ charts 100% and 90% DoD
- added BAK N21700CD-53E to the charts. I have noticed that this is the second revision of this model, (the first revision was without E) so let's hope for better results. In charts it is listed with a bad marking without E, it will be corrected in the next update.
- I have temporarily removed the results for the 5000 mAh category 21700, which I will sort and bring them back in time.
- Samsung 50S2 sampes arrived so tests will start soon
Update:
- updated 5300mAh+ charts 100% and 90% DoD
- added BAK N21700CD-53E to the charts. I have noticed that this is the second revision of this model, (the first revision was without E) so let's hope for better results. In charts it is listed with a bad marking without E, it will be corrected in the next update.
- I have temporarily removed the results for the 5000 mAh category 21700, which I will sort and bring them back in time.
- Samsung 50S2 sampes arrived so tests will start soon
BatteryMooch
10 kW
Looking forward to this!
Batch/date code OH1T did very well in my testing but the P85T code cells I had seemed to be a lower grade…noticeably worse performance.
Pajda
10 kW
Small update
Update:
- added Table data for BAK 53E
- added 1C @ 100% DoD discharge voltage chart for 5300+ category (in the second post)
- Samsung 50S2 start 0.5C-4C cycling 100% DoD (4C-rate is chosen here for two reasons, first is the limitation of my NEWARE tester to 20A and the second is that for Samsung 50S the end temperature at 20A is around 72°C with 20°C Room Temperature, so the 50S is not able to run 5C continuous discharge without forced cooling)
Update:
- added Table data for BAK 53E
- added 1C @ 100% DoD discharge voltage chart for 5300+ category (in the second post)
- Samsung 50S2 start 0.5C-4C cycling 100% DoD (4C-rate is chosen here for two reasons, first is the limitation of my NEWARE tester to 20A and the second is that for Samsung 50S the end temperature at 20A is around 72°C with 20°C Room Temperature, so the 50S is not able to run 5C continuous discharge without forced cooling)
Pajda
10 kW
Small update
Update:
- added more cycles for both 90% and 100% tests in the first and second post
- BAK N21700CD-53E initial results look promising
Update:
- added more cycles for both 90% and 100% tests in the first and second post
- BAK N21700CD-53E initial results look promising
Pajda
10 kW
I found a shop Upgrade Energy Batteries - Elite Performance where it seems you can get Amprius SA10 cells (4Ah @ 14.4Wh in 18650 format) only you have to disassemble them from the pack. They have also other Amprius cells in pouch format. You can also download Amprius and Molicel P50B datasheets from here: Datasheets | Upgrade Energy
After looking at the datasheet for the SA10, I am not sure if I need to order this cell
, because the cycle life is already measured here (for which Amprius deserves a thumbs up, because it is not very good). Also there should be a SA17 cell (6Ah @ 21.6Wh in 21700 format) but not available here.
After looking at the datasheet for the SA10, I am not sure if I need to order this cell
, because the cycle life is already measured here (for which Amprius deserves a thumbs up, because it is not very good). Also there should be a SA17 cell (6Ah @ 21.6Wh in 21700 format) but not available here.Pajda
10 kW
Small update
Update:
- updated 5300mAh+ charts 100% and 90% DoD in the first post
- decided to measure Samsung 53G again with NEWARE tester (temperature data)
Update:
- updated 5300mAh+ charts 100% and 90% DoD in the first post
- decided to measure Samsung 53G again with NEWARE tester (temperature data)
BlueSwordM
100 W
- Joined
- Jul 23, 2018
- Messages
- 231
I know this is somewhat offtopic Padja, but it would be lovely if you could test this HE LFP 21700 cell:
Also this monstrosity of a high power cell that can charge at 10C:
Also this monstrosity of a high power cell that can charge at 10C:
Pajda
10 kW
@BlueSwordM I think it's a great idea to test some of the best of the best of the best LFP competitor in the HE category. The question is only where to get samples of this particular Lishen LR2170EH model?
And I'd quite like to torture that HP NMC guy from Lishen with 5C charging (still limited to 20A for now). Very soon I'll have up to 3 channels free again (BAK 45D and EVE 40PL going into the final 1000cycles). Recently I thought to test the Molicel P50B at 4C charging, when it did 3C with ease. It was more a question of whether to set up a 4C charging and stay with the 3C discharge, to check the charging capability only, or to test with 4C-4C cycle.
And I'd quite like to torture that HP NMC guy from Lishen with 5C charging (still limited to 20A for now). Very soon I'll have up to 3 channels free again (BAK 45D and EVE 40PL going into the final 1000cycles). Recently I thought to test the Molicel P50B at 4C charging, when it did 3C with ease. It was more a question of whether to set up a 4C charging and stay with the 3C discharge, to check the charging capability only, or to test with 4C-4C cycle.
BlueSwordM
100 W
- Joined
- Jul 23, 2018
- Messages
- 231
On the topic of the 21700 LFP cell, I sent an email to Lishen to know about their distributors.
Otherwise, I'll have to check if it's available on my Alibaba distributors.
Worst case scenario, I ask one of my Chinese friends to get one of those cells for me
thermal_runaway
100 mW
Supposedly Molicel is sampling a 6.4Ah 21700 (M64A) with MP Q3 this year.
Where does this picture come from ?
BlueSwordM
100 W
- Joined
- Jul 23, 2018
- Messages
- 231
Oh, the surface temperature part is VERY interesting.
Pajda
10 kW
Small update
Update:
- updated 5300mAh+ charts
Update:
- updated 5300mAh+ charts
Pajda
10 kW
Back to @BlueSwordM idea to test some HE LFP samples. I recently ordered JGNE 18650 2200mAh samples from Nkon, which should have an even higher VED of 420 Wh/l than the Lishen LR2170EH ones with 386 Wh/l.
BlueSwordM
100 W
- Joined
- Jul 23, 2018
- Messages
- 231
2200mAh? That is a nice amount of energy for an LFP 18650.
A 21700 class version of this cell for budget ebike builds would be wonderful to create 150$/kWh finished packs.
Pajda
10 kW
Small update
Update:
- updated 5300mAh+ charts 100% and 90% DoD
Vapcell F60 died after 800 cycles at 100% (with 2.8V cut-off), when cycled down to 2.5V it was around 700 cycles.
Update:
- updated 5300mAh+ charts 100% and 90% DoD
Vapcell F60 died after 800 cycles at 100% (with 2.8V cut-off), when cycled down to 2.5V it was around 700 cycles.
Pajda
10 kW
JGNE 18650 2200mAh LFP samples from Nkon arived today, hope to release first results this week.
Pajda
10 kW
First teaser AC temperatures will be available soon
AC temperatures will be available soon
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Souvlucky
100 mW
- Joined
- Jun 29, 2016
- Messages
- 48
Kumyang has licenced StoreDot's technology and they have listed some curious new cells on their website:
There's also some information about the 46-series form factor (with claims up to 320Wh/kg):
- 7.0Ah (325 Wh/kg)
- 6.7Ah (320 Wh/kg)
- 6.0Ah (316 Wh/kg)
- 5.6Ah (301 Wh/kg, and apparently ready for production)
- 5.5Ah: 295Wh/kg
- 5.0Ah: 268Wh/kg (two variants mentioned, 50P/50P3)
There's also some information about the 46-series form factor (with claims up to 320Wh/kg):
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