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Discussion
LiPo Technical / Engineering info
I am looking for engineering data and application notes on LiPo cells. I am not looking for rc hobby sources but rather the sort of information an engineer might use to learn about and created designs using the technology. I'd appreciate any links to relevant sources.
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Thanks. |
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i believe you can't find these kind of informations since they are considered industrial secret, maybe you can ask a job at some cell manufacturer and they share cell informations with you.
You can get general cell informations from manufacturers like A123 systems, and there are many cell testing information on this forum too. I remember the most dangerous cells are the cobalt ones you wrote. And Lithium was/is being used in some A-bombs too. Z |
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Temperature of LiPoly fire, fact that they can burn under water and many other such facts were discussed here back when I was a new member (Oct 2004) just like the fact that Lithiun is barely a trace element in LiPolys unless one float charges them for hours on end at 4.2 volts which does cause Lithum plating to take place in them.
hobby use to have links to numerious LiPoly White paper) and there is a great deal of data posted on the FMA Website from the early days. Charles |
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Thanks. |
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A hobby is an activity or interest that is undertaken for pleasure, typically done during one's leisure time Hoppy A long time member of RCG. ![]() |
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Chemistry
Operation Charging and discharging characteristics Failure modes Material safety Life expectancy Application data In the case of the failure mode where cells out-gas and catch fire I am looking for detailed data: pressures, fire temperature, duration in relation to cell size and type, energy content, etc. A number of the above items can be found spread across various sites. I was hoping to find a cell manufacturer that took the time to treat the subject to hear it from the horses mouth, if you will. |
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For example, popular knowledge in RC circles says that you don't want to discharge a LiCoO2 cell below 3.0V. The question is: Why? What happens chemically at or below 3.0V?
Same for the opposite end: What happens at or above 4.2V? What is the tolerance? What are the principles that determine these voltages? How are they affected by the operating temperature of the cell? Are they affected by the number of charge/discharge cycles? ...and a bunch of other questions that I don't know yet. |
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I am working on a number of things, including an idea for a charger that I've been wanting to build for a while. I don't want to use "hear-say" data for my assumptions. |
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