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Lishen 272AH thread?

mine were supposed to arrive Thursday; but due to midwest blizzard conditions, they finally all arrived on Sunday January 17th, 2021 morning at 920am. but they are all here. i unpacked them and started paralleling them together for top-balancing. all cells in perfect condition. no problems with scratched off codes or any nonsense like that. 272Ah Lishen 3.2 volt cells order of 32cells paid on November 18th, 2020.
Thanks for the update Michael. Sorry if you already noted this earlier in the thread, but who did you order from?
 
the second 32 Lishen cells 272Ah I bought thru Alibaba.com the vendor was
Shenzhen Sanben Chupin E-Business Co., LTD with my vendor's name of Ryan Zeng.
he typed back messages in good English -- never talked to him but messages always came back quickly. probably 12-hour time zone difference to South Dakota USA from China
each box of 4 cells was carefully packed with plastic protective corners. I was impressed.
this vendor provided ship tracking and sent me copies of the FedEx shipping labels early on. etc.
I would recommend and buy from Bryan Zeng again.
I have 16 cells in parallel and top balancing them now via my solar array.
I paid with my capital one credit card through alibaba.com
the slow part started at the port and customs in long beach California as they arrived at the port on December 22nd, 2020.
I ordered and paid on November 18th, 2020 and they arrived in long beach California on December 22nd; then finally to rural South Dakota on January 17th, 2021(Sunday at 920am).

below is a pic of 16 of the cells. I got them all labeled today. I put a piece of red tape on the positive end of every cell and used my Dymo label maker and typed out positive and put that on top of the red tape. I accidentally arc-ed two cells in my previous builds that I received in December, so I am very careful now.
8 cells are in parallel configuration for top balancing.?
the 1st 32 Lishen cells I also bought thru Alibaba.com but the vendor did not timely reply but all cells were in perfect shape then also.
Ryan Zeng was a good vendor.
I think you need 2x the busbars in order to parallel and top balance.
I can only do half of them 16 at a time as I received 4 busbars with 4 batteries plus bolts and washers all carefully packed.
 

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I just ordered 32 200 ah lishen cells from alibaba.how did your capacity compare to ratings .this is my first order from China just hope I get what I paid for bought mine from shenzhen shouhuzhe energy was going to buy 272ah they were out and I got a really good qoute of 47.00 cell so that's what I'm building 2 sets of 16s
Sorry, I hadn't logged into the forum for a while. I measured just at 200 AH capacity for my 202AH cells, so I'm happy enough. I know the uncertainty of my measuring equipment is probably greater than the 1% difference. I also stopped my test at 2.7 volts per cell, as I saw that my measurements were close enough to satisfy me, and I didn't want to risk damaging my cells just for the sake of a capacity test result.
 
Sorry, I hadn't logged into the forum for a while. I measured just at 200 AH capacity for my 202AH cells, so I'm happy enough. I know the uncertainty of my measuring equipment is probably greater than the 1% difference. I also stopped my test at 2.7 volts per cell, as I saw that my measurements were close enough to satisfy me, and I didn't want to risk damaging my cells just for the sake of a capacity test result.
I can tell you that last little bit there between 2.7 and 2.5 is at most .25 to .20 amp hours on an Eve cell. 200 amp hours is good enough.
 
I bought 20 of the Lishen 272 AH cells, so far so good. Arrived in perfect condition, no issues with threading on the lugs. I fully charged and discharged one cell and it rated just over 280 AH. 16 going into a 48V pack, and 4 spares, or I may make a 12V portable solar generator with the extra cells.
 
I used 2 6guage cables to turn the corner on my 2p8s 24-volt battery bank 272Ah Lishen cells. 16 cells = 13,926.4Wh. will be making better busbars soon. right now using the ones provided by the vendor.
I changed those 2 cables to 2 gauge and used Selterm tinned copper lugs with 1/4 inch holes (hydraulically crimped)as there seemed to be a charging issue between cells 4 and 5. now all is working as expected. also re-snugged and checked all connections.
 
VERY VERY VERY SAD ........

My thorougly tested 8x 272Ah lishens have been in my campervan for about a month now. Yesterday I walked by the van and I smelled smoke.
I went in and this is what I saw:


IMG-20210128-WA0002.jpeg

I'm not sure if my camper can be repaired :-( .. EVERYTHING EVERYWHERE under thick black soot. Some windows melted, every plastic bit melted from front to back. Some holes burned through the wall. Brand new Maxxfan melted, fridge melted, heater melted, charger, victron mppt, victron 220v converter, acdc converter everything melted. All doors of cubboards burned. Terrible, I loved this camper and I have owned it for many years. I just did a big upgrade with all of the above appliances new last year.
This is what it looked like before yesterday:20210110_151148.jpg

I'm not sure what has caused it. It was charging at a rate of about 20A that night I think.
The four cells on one side have swollen terribly an a few are bursted open.
Maybe they were terribly overcharged, and the JBD / overkill BMS hasn't stopped the charging when one or two cells where full.
Or there has been some kind of internal problem in the cells..

 
It looks the burnt started from the top section of the enclosure.
At least you are OK. Please let us know what you find.
 
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OMG....So sorry to see this... :( Very, very scary. The main thing is you are ok.

No telling what caused it and I am not going to start speculating. If you decide to investigate further and have some more ideas as to what happened please share. But can't fault you if you don't.
 
VERY VERY VERY SAD ........

My thorougly tested 8x 272Ah lishens have been in my campervan for about a month now. Yesterday I walked by the van and I smelled smoke.
I went in and this is what I saw:


View attachment 34974

I'm not sure if my camper can be repaired :-( .. EVERYTHING EVERYWHERE under thick black soot. Some windows melted, every plastic bit melted from front to back. Some holes burned through the wall. Brand new Maxxfan melted, fridge melted, heater melted, charger, victron mppt, victron 220v converter, acdc converter everything melted. All doors of cubboards burned. Terrible, I loved this camper and I have owned it for many years. I just did a big upgrade with all of the above appliances new last year.
This is what it looked like before yesterday:View attachment 34975

I'm not sure what has caused it. It was charging at a rate of about 20A that night I think.
The four cells on one side have swollen terribly an a few are bursted open.
Maybe they were terribly overcharged, and the JBD / overkill BMS hasn't stopped the charging when one or two cells where full.
Or there has been some kind of internal problem in the cells..


Glad to hear nobody was hurt or worse.

I had one of my JBD BMSs fail to trigger either LVD or HVD, in app they showed charging/discharging off but the relay/contactor didn't lock out.

Also especially for a mobile installation, I think fuses are important (I use a total cell positive Bussman fuse), plus breaker switch, and a very generous coating of Kapton tape over every busbar and terminal.

If you've ever accidently touched the busbar with a stray cable lug, the spark and molten metal is unforgettable.

You should probably have some tube coverings for the tension rods also.
 
Maybe an issue of the 4s bms monitoring multiple cells per lead? Not sure if this could be an issue or not, just throwing it out there.
 
I don't know that it was the battery that's at fault - let's not even assume that. We'd love to know what happened so the rest of us can learn, if you're comfortable doing an autopsy. It kind of looks like it started somewhere else.
 
I really cannnot diagnose the cause. + and - both had a fuse.
the 4s bms monitoring 2 cells per lead should not be a problem, it's common practice and the two cells per lead are parallel so should level each other.
Only things I can think of are 1: the wiring of the charger has a bad contact and heated up and has melted on of the balancing leads 2: an internal problem in one of the cells 3: the BMS didn't stop the charging when the cell was full. But 3 is unlikely, the cells were perfectly balanced and 4 of the cells are still ok, and are at only 3,3v now, so not full..
 
@stobbie, that's horrible. The time, effort, and money you put into that system.... I'm sorry for your loss. Glad you are okay though.
 
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Overcharging causes heating within a cell and prolonged or extreme overcharging has the potential to cause a fire.

I don't know the specifics of how stobbie configured his system but as a general rule:
Most BMS modules are meant to be a last line of defense against over/under charging.
Typically charge control should be a separate dedicated function/system.
IE: Best not to depend on the BMS module to control charging.

Hard to do a postmortem on a pile of charcoal.
May never know the cause of his meltdown...

Stobbie did mention that he forgot to turn his charger off during top balance:

This post makes me wonder if perhaps he damaged one or more cells while top balancing.

IE: "I've done my charge at 50 amps, but forget to turn the carger off, so it kept on charging until amps dropped to zero, and it seems that one cell has developped a very very slight bulge, only a mm or so.."


In another post - I can't put my finger on it right now - but to summarize - I think he was having some issues with the busbars making good electrical contact. That could potentially result in the BMS not seeing the actual cell voltages.

I offer that comment as a possible justification for investing in good busbars. Personally I like the CALB busbars - five thin layers of flexible copper with an arch in the middle: https://amprevolt.com/collections/battery-accessories/products/prismatic-cell-lifepo4-busbar

Perhaps the moral of the story is - "A chain is only as strong as the weakest link" - and there are a lot of links in a DIY lion system...
 
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How could the batteries get overcharged, I thoughtbthe victron mttp would stop charging even if the bms failed
 
I had my charger set at 13.6v. But if one cell would have drifted the BMS is the only defence. But I have done a lot of test cycles and all cells were perfectly balanced. I've matched cells with the same interal resistance. I've polished all contact areas and almost had nog voltage drop accross my bushbars anymore. I'm sure the bushbars didn't cause the problem. I don't think a cell was damaged during top balance as well, because I've done at least 20 full cycles and the cells stayed in balance within a three or four millivolts.
 
I had my charger set at 13.6v. But if one cell would have drifted the BMS is the only defence. But I have done a lot of test cycles and all cells were perfectly balanced. I've matched cells with the same interal resistance. I've polished all contact areas and almost had nog voltage drop accross my bushbars anymore. I'm sure the bushbars didn't cause the problem. I don't think a cell was damaged during top balance as well, because I've done at least 20 full cycles and the cells stayed in balance within a three or four millivolts.
Please do not think I was pointing blame, I am just trying to learn and do not assume you did anything wrong..

Do you thinknit is possible that something in the corner closest to the wall started the fire and not the batteries?
 
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