Internal resistance of a battery cell

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SUMMARY

The internal resistance of a battery cell typically increases as the cell discharges, particularly in alkaline cells. This behavior can be modeled using the equation ∆V=E - I*r, where E represents the electromotive force (emf), I is the current, and r is the internal resistance. Different battery chemistries require distinct models to accurately represent their behavior, indicating that a universal model does not exist for all types of cells.

PREREQUISITES
  • Understanding of electromotive force (emf) in battery cells
  • Familiarity with the relationship between current and internal resistance
  • Knowledge of battery chemistry variations and their implications
  • Basic grasp of electrical circuit principles
NEXT STEPS
  • Research the impact of internal resistance on lithium-ion battery performance
  • Explore modeling techniques for different battery chemistries
  • Learn about the effects of temperature on battery internal resistance
  • Investigate methods to measure internal resistance in battery cells
USEFUL FOR

Electrical engineers, battery researchers, and anyone involved in battery technology development will benefit from this discussion.

Cici2017
if a cell is running down, there would be a constant drop in p.d. across the cell, does the internal resistance of the cell increase or decrease?
 
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There are lots of ways to model a battery cell. One way is with a constant or variable EMF and a variable internal resistance that increases as the cell discharges. That's not a bad model for alkaline cells.

However different types of cell (eg different chemistry) need different models. There isn't a one model that fits the behaviour of all cells.
 
Emf of a cell is the potential difference between it's terminals when terminals are connected externally.
∆V=E - I*r
E=emf
I=current
r=internal resistance
 

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