Termination method: Temperature rise per time interval [dT/dt]

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cj0
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Joined: Sun Apr 24, 2016 7:32 am

Termination method: Temperature rise per time interval [dT/dt]

Post by cj0 » Mon Apr 25, 2016 9:45 pm

As termination method and/or additional termination method I do wish to add temperature rise per time interval [dT/dt].

For example terminate charging when temperature rises > 1 degree in 1 minute.

And (optionally) depending on the precision and noise of the temperature probe: > 0,5 degree in 30 seconds.

Mark
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Re: Termination method: Temperature rise per time interval [dT/dt]

Post by Mark » Mon Apr 25, 2016 10:50 pm

Although in theory, dT/dt should be a reliable termination method, in reality, I don't think that it is. Unfortunately, there are far too many factors that can cause problems - e.g. turning off an air conditioner in a room can lead to a sudden rise in temperature which could lead to a false termination. If a cell has high internal resistance, the temperature of the cell can get quite high during the main part of the charge and then not rise very much at the end.

With the inflection termination method used by this charger, it will terminate before the cell temperature starts to rise significantly anyway, so this method would just be redundant IMHO.

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