Analysis of Lithium Battery Capacity Test Method

Capacity is the central parameter of lithium batteries. Lithium battery manufacturers generally have special equipment for testing to ensure that the quality of their products is qualified. 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 a lithium battery and a multimeter, a charger is also prepared) First of all, we must theoretically know several voltage values u200bu200bof the lithium battery: 1. The charge stop voltage: it is also the no-load voltage, that is The highest voltage when not in operation is generally 4.2V. 2. Operation/nominal voltage: It is also the load voltage, the voltage during normal operation is generally 3.7V. 3. Discharge stop voltage: the voltage at which the battery cannot be operated. There are different plans for 3V and 2.75V. To start the test, first use a charger to fill the battery with a full-charge 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 stop voltage, which is 80%, but it can be left for 8 hours, which shows that the power of the lithium battery has increased. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Breakdown of the cost of lithium iron phosphate battery