Taper charging

Example

Use in Lemonergy

Separate regulation from availability.

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

Connected concepts

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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.

IU, IUoU and IUI charging

The letter code, set out in DIN 41772, for a charger’s profile: I for a constant-current stage, U for constant voltage and W for current that falls as voltage rises. IUoU charges lead–acid at constant current, then at a raised voltage, then at a lower float voltage; IUI ends with a small constant current that finishes flooded traction cells and stirs their acid by gassing.

Lead–acid battery

The oldest rechargeable chemistry, lead and lead dioxide electrodes in sulfuric acid, at 2 V per cell. Heavy and short-lived in deep cycling but cheap, recyclable and good at cold cranking, it still starts most cars and backs up most telecom sites.

Overcharge

Charging past the upper cutoff voltage. The positive electrode over-delithiates and releases oxygen, the electrolyte oxidises and lithium plates on the negative, so an unprotected overcharge can end in thermal runaway.

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.

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.