The automotive consumer e-target is/was $60kWh to be competitive with ....DogDipstick said:
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A mAh cell of 3.6v nominal ( 4.2(aH) x 3.6(Vn) ) = 15.2 watt hours. A single gen4 Chevrolet Volt cell holds ~90 watt hours each.
I purchased 88 cells, in a 44s, 162v nominal battery. 8,900 watt hours. Eight thousand, nine-hundred, watt hours. Half a pack. Came in a OEM GM box that said " Property of GM" and " MADE IN TE USA"... a very very fancy shipping box that bolted the modules down and straps closing the box and fancy warnings all over it... You can see the pack, labeling, and the embossed plastic ship container in the pic below....
The kWh number.... It is printed on a label on the side of the pack. By the factory. The factory is in Ohio. Where the modules were assy. The factory puts a sticker on teh modules, and teh pack as a whole, and tehy each have their own Chevrolet part numbers with Julian dates. A factory employee, is tasked with this chore, or a machine, that places this sticker, on the pack, before the pack is shipped out to its final destination. The sticker is probably printed on a roll in another part of the factory, using a computerized system.
I also test on my Powerlab to make sure they meet the mark.
IT WAS 88 cells, in a 8.9 kWh nominal config.... I have purchased over half a thousand of these ( Chev Volt) cells, and sold most of them..... Not very "wishfull"... But very easy actually. You only need to have money to purchase them, no wishful thinking involved.
Being as I have answered.
Would you like a photo of many cells? Here. I do have pics of like fifty or sixty sitting on tables, waiting for the sale.
(YOU CAN ALSO CLEARLY SEE THE OEM "2kWh" LABEL ON THE EbAY PICTURE, and JULIAN DATE. IN the picture from eBay, that you posted.)
THIS module (the eBay module you linked... ) is actually overpriced, used, and no real history, with questionable specs... ( ripoff imho). It is one of the earliest modules, you can tell by the plate structure and color of the fiberglass plastic. I buy a kWh of those cells, used, ( early gen) for 80$ a kWh. He has a mid sized module in the pic... So that is 2kWh. You can get a 3kWh module form a later car pretty easy if you look, for that 600$ price for sure. Like I said, Art at Greentec advertises those 80$ modules on the ( this forum) forum in the for sale section. I show two ( 1kWh) early modules in the pic below.... Running my datalogger. Those were 80$ from Art. They are the LG P1 cell, a 14.5Ah cell that holds the least watt hours out of all the cells in the Volt. There were four revisions of the Chev Volt cell / pack choice. I have tested and used all four of those part numbers in ebike builds.
He really does not know what he is talking about. EVERY spec is wrong. They are NOT 17Ah ( really 14.5Ah) , nor from , ( from or ) nor is it 50Ah oem. ( 45Ah oem) ... NOT LiMn2O4 with LiNiO2, ( they are lipos, not lions). ... NOT 48v nominal ( really 44v nom. )... Grrrrrr.... NOT 3s12p.. Jesus how could you get that wrong and have any sort of faith in your numbers. Lol.. This is why I do not buy off eBay. Noooope.
[Sic]
THIS GUY at least tells teh correct config, even though he lies about the capacity ( not 27Ah cell, but a 25Ah cell)... 600$.
( I have tried to purchase, and have paid for, this particular module a couple of times.. but he keeps on cancelling the sale, for I am pretty sure he knows who i am, and that, i might prove his specs wrong and request a return.. or compensation.. for his lies: and uneducated, incorrect, ambiguous, description... ( ...that, which I would, do, given that chance.) The Chevy published data does not coincide with ANY of his data... and I have asked him about that, several times without response... in the past, through the eBay messenger.... )
Sure, I have tested over a thousand.... They are 0,25 x ~6 x ~10... If you really want a pic here you go.
I use a Revolectrix Powerlab, a four channel, 32s w datalogger. I run it with 6kWh of the car cells. I can test up to 32 cells, or 32 groups of cells, in series, or not, at one time, up to w ( 40A each, so yes I can do 1C testing of cycling charge/discharge on a datalog). Typical cycle is a charge from storage voltage, discharge cycle, charge cycle, discharge cycle, and back to storage voltage, all on a datalog. Logs each channel individually. Very clearly shows the collumbic efficiency and the IR, capacity, and curve, of the cell. All data can export to Excell for easy manipulation of the graphs if you dont want to use the Powerlab native graphing features ( Excell is better at this)... Real 1C rate determination through PID loop controlling the current...
The automotive consumer e-target is/was $60kWh to be competitive with ....What do you figure is the kWh rating of each of those 9 Chevy Volt cells ?Being you have yet to answer Hh's post it may be that your post is wishful thinking. Being you bought 9 Chevy Volt Li-ion cells is it possible for you to post a photo of 1 of thoseSo, 140$ a kWh is an unbelievable bargain considering ....This Lithium Ion Chevy Volt 48V 2kWh Battery w/BMS is $590 on ebay ....... a photo of 1 of those [pouch?] cells next to either an or cell so we can see the difference in size ?Would be interesting to know how you went about testing the cells for c/d capacity, IR, etc.
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