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Author Topic: Why do Li-ion Batteries die! Testing with 6 digit accuracy.  (Read 5088 times)

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Offline firepowerTopic starter

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Why do Li-ion Batteries die! Testing with 6 digit accuracy.
« on: March 21, 2015, 02:04:47 am »
testing battery Coulomb efficiency to accuracy of 6 digits, allows prediction of cell life.
Lecture on Li-ion chemistry and additives, charge rates and temperature.

https://youtu.be/pxP0Cu00sZs
« Last Edit: March 21, 2015, 04:02:54 am by firepower »
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Offline Fsck

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Re: Why do Li-ion Batteries die? Testing with 6 digit accuracy.
« Reply #1 on: March 21, 2015, 02:15:12 am »
it was phrased as a question so when I entered the thread, I thought you wanted an answer :(
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Offline firepowerTopic starter

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Re: Why do Li-ion Batteries die! Testing with 6 digit accuracy.
« Reply #2 on: March 21, 2015, 04:05:22 am »
Sorry about that , just a great lecture on Li-ion and use of high accuracy 6 digit automatic measuring.
Thought that would interest all the guys with the Keithley mulitmeters.
« Last Edit: March 21, 2015, 08:00:31 am by firepower »
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Offline bingo600

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Re: Why do Li-ion Batteries die! Testing with 6 digit accuracy.
« Reply #3 on: March 21, 2015, 10:35:46 am »
Quote from: firepower on March 21, 2015, 04:05:22 am
Thought that would interest all the guys with the Keithley mulitmeters.

Dammm I have a 34401A, a 3457A and a 3458A

I guess i'm not allowed to watch  ::)

/Bingo

Well maybe i am anyway , i also have a K2015  8)
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Offline Alex Eisenhut

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Re: Why do Li-ion Batteries die! Testing with 6 digit accuracy.
« Reply #4 on: March 21, 2015, 12:54:41 pm »
6 digits of precision.

(runs away)
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Offline paulie

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Re: Why do Li-ion Batteries die! Testing with 6 digit accuracy.
« Reply #5 on: March 21, 2015, 01:01:46 pm »
LOL, that is absolutely the funniest post of the week. And I am hugely sympathetic toward your byline.
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Online macboy

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Re: Why do Li-ion Batteries die! Testing with 6 digit accuracy.
« Reply #6 on: March 21, 2015, 03:58:01 pm »
Quote from: Alex Eisenhut on March 21, 2015, 12:54:41 pm
6 digits of precision.

(runs away)
Actually the 3458 has 6 digits of 24 hour transfer accuracy (0.6 ppm). It has 5.5 digits at one year.

I relate though, I too hate when accuracy and precision are confused.
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Offline electrodacus

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Re: Why do Li-ion Batteries die! Testing with 6 digit accuracy.
« Reply #7 on: March 21, 2015, 06:45:00 pm »
I seen that lecture some time ago.
My new Solar BMS is almost good enough to do this sort of tests with the 24bit ADC for current measurement. The voltage is just at 1mV resolution / cell and relative accuracy around 3mV.
I will need to see what sort of accuracy I get when is done. It will be anyway more than good enough for the intended purpose :) 
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