Impedance matching for battery charging?

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Discussion Overview

The discussion revolves around the necessity and implications of impedance matching when charging batteries from a power source. It explores various charging methods, algorithms, and considerations related to battery types and their characteristics.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants suggest that while transmission line impedance matching is not necessary, the charging source impedance should be within a range relative to the battery's internal resistance to optimize current delivery.
  • One participant mentions that a circuit designed to provide a maximum charge current with a voltage limit can effectively manage battery charging, indicating that this can be achieved through various means, including transformers and rectifiers.
  • Another participant emphasizes that the charging algorithm must be tailored to the specific type of battery, noting that different batteries have varying requirements for constant current or constant voltage charging, as well as different tolerances for overcharging and temperature conditions.

Areas of Agreement / Disagreement

Participants express differing views on the necessity and methods of impedance matching in battery charging, with no consensus reached on the best practices or algorithms to use based on battery types.

Contextual Notes

The discussion highlights the complexity of battery charging, including factors such as charging algorithms, battery types, and environmental conditions, which may affect the applicability of impedance matching.

QandA4u
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Hi all, I am wondering if there is a need for impedance matching to charge a battery from the source? Thank you
 
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QandA4u said:
Hi all, I am wondering if there is a need for impedance matching to charge a battery from the source? Thank you

No need for impedance matching of the transmission line type but the charging source impedance/resistance usually should be relatively in range of battery internal charging resistance to deliver the maximum recommended current at the needed difference in charging voltage from the flat battery voltage when fully discharged. This is usually handled by 'circuit' using a current source set to max charge current with a voltage limit set to max charging voltage. This 'circuit' doesn't have to be strictly electronic, a properly designed 'battery charging' transformer and rectifier can have the same effect.
 
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nsaspook said:
No need for impedance matching of the transmission line type but the charging source impedance/resistance usually should be relatively in range of battery internal charging resistance to deliver the maximum recommended current at the needed difference in charging voltage from the flat battery voltage when fully discharged. This is usually handled by 'circuit' using a current source set to max charge current with a voltage limit set to max charging voltage. This 'circuit' doesn't have to be strictly electronic, a properly designed 'battery charging' transformer and rectifier can have the same effect.
Thank you Nsaspook :)
 
Lot depends what you are doing. The charging algorithm you need depends on the type of battery. Some need/prefer constant current, others are ok with constant voltage and a current limit. The way you detect the full state also varies depending on the cell type and the speed of charging. Some can tolerate long term overcharge, others can't. Some cells should not be charged when very cold. Some shouldn't be fast charged if they are hot or have been discharged below a certain voltage.
 
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