dT/dt termination

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

Related concepts from the knowledge graph. Connections show context, not cause and effect. Hover or focus a linked term for its definition.

Charge termination

How a charger decides that a battery is full. Lithium-ion chargers end the constant-voltage stage when current falls to the taper current; nickel chargers watch for a small voltage drop or a fast temperature rise; lead–acid chargers drop to a float voltage. A safety timer and a temperature limit back up every method.

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.

Nickel–metal hydride battery

A 1.2 V aqueous cell with a nickel hydroxide positive electrode and a hydrogen-absorbing alloy negative. It powered hybrid cars for two decades and is tolerant of abuse, but lithium-ion stores two to three times more energy per kilogram.

Oxygen recombination

The internal cycle that lets sealed nickel and valve-regulated lead–acid cells tolerate overcharge: oxygen evolved at the positive electrode diffuses to the negative and reacts back to water, so the excess charge ends as heat instead of gas. It is why NiMH can take a C/10 trickle charge and lithium-ion, which has no such route, cannot.

Temperature sensor

Usually a negative-temperature-coefficient thermistor glued to a busbar or cell surface, with a few per module. Because sensors read the surface, the hottest point inside a cell can run several degrees higher than the BMS sees.

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.