Capacity test

Example

Explore the graph

Use in Lemonergy

Record specimen, state, instrument, temperature and timing.

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

Learn it in Lesson 2 · Capacity and C-rate →

Connected concepts

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

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.

Cutoff voltage

The terminal-voltage limit that ends a discharge, or caps a charge — in constant-current, constant-voltage (CC-CV) charging the cell is then held at that voltage until the current falls to a cutoff. A real discharge ends at the lower cutoff, which is why actual runtime can differ from the ideal duration.

Nominal capacity

The charge a cell is rated to deliver under specified test conditions — current, temperature, rest and voltage limits — usually in ampere-hours.

Rate capability test

Discharging a cell at a series of rates — C/10, C/3, 1C, 2C, 3C — from a full charge and recording the capacity delivered at each. The result is the rate-capability curve on a datasheet and the first sign of a transport limitation.

Reference performance test

A fixed set of measurements — capacity, resistance by pulse, sometimes impedance — repeated at intervals during an aging test to track state of health under identical conditions. Everything between RPTs is the aging itself.

References & further reading

Technical references

1. Battery Test Manual For Electric Vehicles, Revision 3

   Jon P. Christopherson · Idaho National Laboratory · 2015

   Technical reference · Performance characterization, pulse resistance/power, life testing and reference performance tests; historical 2015 edition.

2. DOE Energy Storage Handbook, Chapter 16: Energy Storage Performance Testing

   Sandia National Laboratories

   Technical reference · Section 2.1.2.1 explains capacity, C-rate and the distinction between capacity and energy; also covers pulse characterization.