Hi,
I'm working on a project for a hybrid with Lithium batteries and I wish to incorporate automation to detect battery voltages as below:
1. Cut-off battery pack completely when voltage reaches 47.6V (14 cells x 3.4V/cell)
2. Cut-off battery charging when voltage reaches 57.4V (14 cells x 4.1V/cell)
3. Some other extreme and intermediate cases as well which I will incorporate as and when I develop them
I am inclined towards using a uP for voltage detection since it gives me flexibility and ability to add complex optimisation algorithms for battery management, whereas a simple analog cut-off circuit is ok as well for now.
I could use a simple resistive divider and an ADC/Comparator to achieve the above by dropping the voltage down proportionately and measuring the same at the uP/Comprator directly, but the variation of the output of the divider with temperature will be far too huge to be applied to extremely sensitive Lithium batterries.
Is there any other method I could use? I wonder what is used for digital voltmeters that measure such wide and high voltage ranges?
Appreciate your help with this one.
Regards,
Deepak
I'm working on a project for a hybrid with Lithium batteries and I wish to incorporate automation to detect battery voltages as below:
1. Cut-off battery pack completely when voltage reaches 47.6V (14 cells x 3.4V/cell)
2. Cut-off battery charging when voltage reaches 57.4V (14 cells x 4.1V/cell)
3. Some other extreme and intermediate cases as well which I will incorporate as and when I develop them
I am inclined towards using a uP for voltage detection since it gives me flexibility and ability to add complex optimisation algorithms for battery management, whereas a simple analog cut-off circuit is ok as well for now.
I could use a simple resistive divider and an ADC/Comparator to achieve the above by dropping the voltage down proportionately and measuring the same at the uP/Comprator directly, but the variation of the output of the divider with temperature will be far too huge to be applied to extremely sensitive Lithium batterries.
Is there any other method I could use? I wonder what is used for digital voltmeters that measure such wide and high voltage ranges?
Appreciate your help with this one.
Regards,
Deepak