So there are 2 big hill that i have to go up total less than 1km. i can pedal a little bit (both knees hurt) to help my xiongda 48 volt 2speed hub that draws 15 A max. so there need not to be much watthour but rather it would need high continous discharge since i would only put one cell or 2 in parallel. iwant something light. even thought li ion provide good discharge and amp hour per weight i m not willing to gamble with all the hazards and risk. sorry. i look at life po4 wich can emit gaz but rarely ignite.
a battery able to deliver 15 amp is the minimum i want to achieve but if it cost not too much more, i would like better the battery to be able to deliver 30 ampcontinuous since i migth have to end up adding another motor on front wheel if i dont have enough traction in winter needing maybe the front wheel with a q100 similar motor to also provide some effort in case the back wheel sliding on ice snow. Im not there yet, ill try with only one motor but if it does not cost too much more i would rather build a battery that can handle 2 x 15 amps continous or simply a more powerfull motor for futur.
i am willing to solder yes (even more if it not directly on the cells ( like it would be easier to use a setup like the liitokala pict with pre)
iam willing to screw but not to spot weld (unless there is a very easy and cheap way to get a spot welder ... not so encline on the idea though.)
i beleive there are pouch , rectangles and cylindrical lifepo4 available at the moment
A))) ?which good cells provide high discharge that i could use for this setup available genuine sourced?
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LIke how many of these on ebay liitokala would be needed for a 48v battery and would that be a good idea cause some article say they are fake?
B))is it possible to find genuine liitokala ?where. on ebay they are about 8dollar per cell but i dont know if there really have the spec inside the cell. with this setup i would not have to buy a NESE wich ends up cheaper to build i think. or maybe those cells are a not to be found genuine anywhere..
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C))maybe to consider Headway cells would be apropriate ?can we get genuine ones atm?
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D))like how many A123 ANR 40 amp continous (are genuine ones still available?) in serie to have 48v? do they also comme with prewelded tabs or i would have to use the NESE module?
feel free to tell me the setups that could answer my 2 hills only problem with my xionda (possible a second hub in front for the future) anything that is light setup(no liion) that can do job that ends up a good bang for buck without me having to spotweld?
thanks
https://www.ebay.com/itm/?_trkparms=amclksrc%3DITM%26aid%3D%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D%26meid%3Df182dad4ca6a480b901a18e5b24%26pid%3D%26rk%3D2%26rkt%3D12%26sd%3D%26itm%3D%26pmt%3D1%26noa%3D0%26pg%3D%26algv%3DSimplAMLv11WebTrimmedV3MskuAspectsVNoVariantSeedKnnRecallV1%26brand%3DUnbranded&_trksid=p.c.m&amdata=cksum%3Af182dad4ca6a480b901a18e5b24%7Cenc%3AAQAHAAABIMFr2e4EmAnM%252ByHZkULYKDIJ4L66fOjNL0iupgt%252BzO1%252F3AE1t3mNirUYB96NktMCicMagiS6mbeTl0xquGODv9l6%252BSPFbGZLpsPgMeSs7T2IJrrRlfRs%252B4ZdwHDlvaAoJvIeL%252F9RHco56pKrfCO366AlTCOyJH6XjASjSehLFB96nbG%252BpYMXpBP9Y2GYDN5pD3v68sdFDlsmVx%252B5dX8hgLsRNTyVcBUFXV2GBfGwrccTMeGK%252BnabkotYpfCJoJ6e%252Bro330JVMnatewnpjvcQKrcE%252FfNSu352z9KDgIE3d0%252FXrNiq%252Fk1mcX3tSKl8xBFaFtybMJrj2ESc2K4YTTKLLuTkFpe1lHjsF8COD1Pvo5P8f%252FtDzMcanxn7C6avYnGLKA%253D%253D%7Campid%3APL_CLK%7Cclp%3A
999zip999 said:
10 years ago there was a bankruptcy sale on
A123 20ah çells . They are 180 amp cells I used them at 80amp max. For 8yrs 1,480 cycles and big and heavy. Love them. Hate big and heavy. Bolt together pack.No bms as 20ah . No bms 20ah and can't. Share. Or try to teach as no bms one man only and may cause fire.Yes lifepo4 can make fire. Late night.Si
Hi zip
i would like to understand better what you are expressing. You bolted your cells ? Why did you not use bms ?
about the fires I read that yes lifopo4 can catch fire but not propagate to other cell so only one would fire not the neigbourscell. to combust them you need to torch them with an external flame torch. They seem very safe. a link a doc made by fireman similar
it is not to deviate the topic just to share with you :extract from https://www.fire.tc.faa.gov/pdf/TC-16-17.pdf
Figure 17 shows the
results of the Li-ion pouch cell propagation tests. This figure shows the number of cells, out of
the five that were physically connected together, that experienced thermal runaway. All of the
cells, except for the LiFePO4, achieved full propagation to all five cells. Thermal runaway of the
LiFePO4 cell did not propagate to any of the cells beyond the initial one that was in direct contact
with the heater.
the conclusion says also In general, of all of the lithium-ion cells that were tested, LiFePO4 would be considered the
safest cathode material because of the relatively low temperature rise and the resulting low
likelihood for thermal runaway to propagate.
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