DC IR vs SOC (VI)

Over the weekend, amongst all the other things happening, I got to add the INR18650-25R DC internal resistance data to the graph below. The data was collected in the same way as previous cell data. The graph showing internal resistance over the full range of SOC is starting to get messy and I note that while this data is useful for a simulation program, it is starting to get difficult to read from a human point of view. The differences in cell resistance look small when in fact they are not.

 Looking at the bar graph below, you will get a better view of the difference in DC resistance of the cells. This shows the internal resistance of each cell when it is at 50% SOC. This is making it more obvious to see the difference between a power and energy cell and gives a better insight into why you would choose one cell over another for certain applications.