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Swollen/Bulging LiFeYPO4 Batteries (TS-LFP60AHA)
#1
I stumbled into a supply of TS-LFP60AHA and TS-LFP90AHA batteries that a high school was getting rid of (abandoned EV project), and was able to pick them up before they went out to the dump/recycling center. The intent is to utilize these batteries for a home powerwall.

The datasheet can be found here: http://en.winston-battery.com/index.php/...ory_id=176

I've been charging/discharging the cells individually using the iMAX B6AC v2 charger (settings below) to get a better idea as to what the capacity would be, to record the performance of the individual cells and sort out the bad from the good, and I've noticed that all of the cells that I've tested (only tested about 5 so far out of the 50) are bulging after they've finished charging. This is somewhat concerning, and I was wondering if others have experienced something similar with your projects and have any recommendations as to how to proceed.
  • Charger settings: Battery Type: LiFe
  • Cells: 1
  • Charge Current: 6.0A (Datasheet recommends 0.5C, and 6A is only 0.1C of the batteries I've tested)
  • Charge Voltage: 3.7V (This is less than the 4.0V recommended by the datasheet and was chosen for safety and longevity)
  • Discharge Current: 2.0A
  • Discharge Voltage: 2.8V
Have people noticed this bulging occurring with these batteries?
Should these bulging batteries be discarded?
Any other thoughts on this?


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#2
If they are bulging, STOP CHARGING now! You're damaging them....
If they are LiFePo4 you should not be charging them to more than 3.45V/cell.
3.7 is way too high & they gas inside = bulge = damage.
If you read up carefully on the web, LiFePo4 reach full capacity with 3.45V or so.
You should set the charger to 3.45V & let the cells reach that & hold there until the current drops to a small amount.
There is no useful capacity above 3.45 & more is NOT better.
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#3
(10-30-2019, 12:20 PM)akaTylerDurden Wrote: [*]Charge Voltage: 3.7V (This is less than the 4.0V recommended by the datasheet and was chosen for safety and longevity)

Perhaps a link to the datasheet you are using? If it's a paper copy, take a picture or scan.
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#4
(10-30-2019, 01:35 PM)Korishan Wrote:
(10-30-2019, 12:20 PM)akaTylerDurden Wrote: [*]Charge Voltage: 3.7V (This is less than the 4.0V recommended by the datasheet and was chosen for safety and longevity)
[*]
Perhaps a link to the datasheet you are using? If it's a paper copy, take a picture or scan.
[*]
In my edit, I added a link to the datasheet.
Datasheet can also be found here: http://en.winston-battery.com/index.php/...ory_id=176
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#5
four volts...its WAY to high
Here you go, and read on what voltage the cell is damaged:
https://files.ev-power.eu/inc/_doc/attac...090AHA.pdf

Original ThunderSky Winston part number: WB-LYP90AHA
Recommended initial and subsequent charging is to 3.65 V.
The minimum voltage is 2.5 V.
Maximum discharge current is 3C continously.
Operating temperature -45°C up to 85°C (discharging)
Energy density is 90 Wh/kg

if there is a bulge after charging, you are to late, you can,.... according to some youtubers....recover those cells.
I don't want to be rude..., but please throw them away, i would do it without hesitation.
First discharge to 0 volt btw

And please check your charger with a proper and good voltmeter, to ensure that it is giving the proper volt what the charger is telling you...just saying, you wont be the first

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#6
Interesting, shows 4.0V as the top voltage for these cells
Discharge to 2.8V.
Standard Charge/Discharge is 30A with a max 180A. That would be non-sustained max.




If they swelled up before they reached 4.0V, then they are probably toasted.


And from 100kwh-hunters' link:

Proceed with caution. Knowledge is Power! Literally! Cool 
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#7
LiFePo4 have cells that go above 4V as top charge. For instance WB-LYP60AHA is considered to be up to 4V and I have cells here that can take up to 4.2V but nominal max is 3.65.
Most of them are fully charged at around 3.6V but several can be charged to 4+V without a damage but with that said for longeivity you should stay below 3.6 for moste LiFePo4 cells.

The swelling can be due to overcharge but it can also just be because they are old and thrown out due to being depleeted and should be recycled.

Same as LiIon have cells that is considered to have max at 4.1V and some at 4.2 and some at 4.35....
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#8
I'll try charging/discharging with the limits of 3.5/2.8 volts accordingly based on the feedback. I'm only using the iMAX B6AC v2 charger, so I'm not terribly worried about rates.

Glad I didn't foolishly test all the batteries at these higher voltages! I was able to get all 50 cells (~17kWh's worth) for $100, so if I happen to ruin a couple, I'm not terribly heartbroken. They were meant for a EV car conversion as a class project. They were installed in the car and never actually used, so I'd hope that they'd still be in reasonable condition even if they were sitting for a while.

Thank you all!!!
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#9
Is there a date code anywhere? How long where they sitting? How long since they were last charged at the EV project site?
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#10
(10-30-2019, 07:25 PM)Korishan Wrote: Is there a date code anywhere? How long where they sitting? How long since they were last charged at the EV project site?

The only other writing appears to be a serial number? 08072309619 

They purchased them a couple years ago, charged them on site, and doubt they discharged them at all since they couldn't get their motor controller working. I just acquired them a month or so ago.
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