Charge termination

Example

Use in Lemonergy

Separate regulation from availability.

This is a reference concept. No executable Lemonergy block has been verified for this term.

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CC-CV charging

The standard lithium-ion charge protocol: constant current until the cell reaches its upper cutoff voltage, then that voltage held constant while the current tapers. The charge ends when the current falls to a set fraction, often C/20.

dT/dt termination

Ending a nickel-cell fast charge when the temperature climbs faster than a set rate, typically about 1 °C per minute, because once the cell is full the charge no longer stored chemically turns into heat. It needs a thermistor against the cells and a charge rate of roughly 0.5C or more to produce a clear rise.

Negative delta V

The small fall in a nickel cell’s voltage just after full charge, as overcharge heats it, used to end a fast charge. NiCd shows about 10–30 mV per cell, NiMH only around 5–10 mV and barely any below 0.5C, so NiMH chargers often stop at the voltage peak or plateau instead and back it up with dT/dt.

Taper current

The current at which a constant-voltage charge stage is declared finished, often C/20 or C/50. A higher taper current ends the charge sooner and leaves the cell slightly less than full.

Trickle and float charging

Holding a battery at a small current, or a fixed voltage, to keep it full. It is standard for lead–acid and NiMH but harmful for lithium-ion, which should be left to rest once charged; lithium-ion chargers instead top up when the voltage sags.

References & further reading

Further reading on this topic

These sources provide broader context; they are not presented as citations for every statement in this entry.

1. Lithium-ion battery fast charging: A review

   Anna Tomaszewska et al. · eTransportation · 2019

   Topic background · CC-CV and alternative charging protocols, transport limitations, degradation and thermal implications; results depend on cell and test conditions. Software behavior is documented separately in Lemonergy block references.