EV battery

How to measure the capacity of 18650 lithium ion battery?

by：Vglory 2021-03-26

There are professional battery sub-capacity cabinets. If there is no professional battery sub-capacity cabinet, you can find an adjustable load resistance and an adjustable current DC power supply to calculate the battery capacity through the charging and discharging time. Charging current × charging time u003d battery capacity (charging from 2.7V or 3.0V to 4.2V or 3.6V) or discharging current × discharging time u003d battery capacity (discharging from 4.2V or 3.6V to 2.7V or 3.0V) 18650 lithium ion Battery method two: Step 1: Fully charge the battery to reach full voltage, generally 4.2V or 3.6V. Step 2: Discharge the battery to the rated voltage. The rated voltage is generally 3.7V, and the lithium iron phosphate is 3.2V. The third step: Charge the battery to a normal level, generally set to 3.6V or 4.2V. The capacity recorded in the second step is the battery capacity. 18650 sub-capacity cabinet method three: use a battery capacity tester, first charge to 4.20V, and then leave it for 1 hour constant current discharge, the arbitration method is 0.2 times, such as 1000mAh capacity, then 200mA constant current discharge to 2.75V cut-off , Calculation time time * constant current u003d battery capacity. 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 post: Why is the lithium iron phosphate battery used as the main battery of BYD?

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