What are the lithium battery capacity and charge-discharge test methods?

Lithium battery capacity test method Capacity is the core parameter of lithium battery. Lithium battery processing manufacturers generally have special equipment for testing to ensure the quality of products shipped. Here is an analysis of the simplest test method: the multimeter test method. Take a 1000mAh lithium battery as an example (here in addition to the lithium battery and a multimeter, a charger is also prepared). First, we must theoretically understand the voltage values u200bu200bof the lithium battery: 1. The charge termination voltage: it is also the no-load voltage, that is The highest voltage when not working is generally 4.2V. 2. Working/nominal voltage: It is also the load voltage. The voltage during normal operation is generally 3.7V. 3. End-of-discharge voltage: the voltage at which the battery cannot work. There are different designs of 3V and 2.75V. To start the test, first use the charger to fully charge the battery with a full voltage of 4.2V, then use a multimeter as a constant current load, discharge at 0.2C (ie 1000×0.2u003d200mA), set the multimeter's discharge voltage to 3V, if it is discharged When the time reaches 5 hours, the battery is qualified. The current lithium battery can generally be discharged to 2.75V, and the discharge depth is the same as the previous 3V as the termination voltage, which is 80%, but it can be left for 8 hours, indicating that the power of the lithium battery has increased. Lithium battery charge and discharge test method Lithium battery charge and discharge test generally adopt constant current-constant voltage charging, constant current discharge mode, record the test time, voltage and current data in the process, and characterize by analyzing the data changes in the process Electrochemical performance parameters such as battery or material capacity, Coulomb efficiency, charging and discharging platform, and changes in battery internal parameters. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Analysis of the important advantages and disadvantages of lithium iron phosphate battery packs