Detailed explanation of 18650 lithium ion battery capacity measurement method

18650 Li-ion battery capacity measurement method steps With the development of society, energy storage lithium-ion batteries occupy an increasingly important position in society. As of the end of 2015, my country’s installed energy storage capacity was 22.8GW, accounting for approximately 1.7% of the country’s total installed capacity. It is estimated that by 2025, the energy storage lithium-ion battery industry will achieve large-scale development, form a relatively complete industrial system, and become a new economic growth point in the energy sector. At present, in the energy storage lithium-ion battery market, there are three important application areas: electric energy storage, household energy storage, and base station energy storage. Among them, the back-up power supply field of communication base stations currently accounts for a large proportion, accounting for the entire energy storage lithium-ion battery market. Nearly half of the share. The capacity of a lithium-ion battery is a prerequisite for how long the device can be used. So do friends know how to measure the capacity of lithium-ion batteries more accurately? Generally, there is a certain deviation between the nominal capacity and the actual capacity of the general manufacturer. Know the steps of the 18650 lithium-ion battery capacity measurement method, let's learn together below. Simple method of constant resistance discharge. To use a multimeter and high-power resistor, first charge it fully. You can charge it in a cradle, such as a phone or a mobile phone. Connect the battery full load to this resistor. Usually it can be a 10 ohm 5W cement resistor to discharge until the voltage is lower than 2.75V, to obtain the total discharge time capacity u003d 0.37A* time. This method is relatively simple, but there is a certain error. . Formal method: 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, 200mA constant current discharge and discharge to 2.75V cut-off, calculate the time *Constant current u003d battery capacity This is done in accordance with the national standard 18287 lithium-ion battery regulations. If it is a nickel-metal hydride battery, the same is true, but the charging method is not constant voltage, and the discharge is cut to 1.0V per cell. This method requires special equipment. Method 1: There is a professional battery divider cabinet. If you are an individual, find an adjustable load resistance and a current adjustable 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 discharge current × discharge time u003d battery capacity (discharging from 4.2V to 2.7V or 3.0V) Method 2: Fully charge the battery to reach the rated voltage, generally 4.2 V The second step is to discharge the battery to the rated voltage, and record the amount of power released. The voltage is generally 3.0V. The third step is to charge the battery to a normal capacity, which is generally set to 3.8V-4.0V. Record in the second step The output capacity is the battery capacity. Method 3: Use the integral function of the power meter to measure the lithium-ion battery capacity required by the device. I usually use the PA310 Zhiyuan* power meter to measure the lithium-ion battery capacity. After measuring the capacity, select a battery larger than the capacity for the device. Up. The procedure of 18650 lithium ion battery capacity measurement method is roughly as above. Under normal circumstances, the capacity of the 18650 battery will not exceed 3100mAh (the limit is 3400mAh, any excess is fake and defective products, there is a danger of explosion. The author is buying a high-light flashlight and the battery is 5000mAh, right, right, small The buddies are stunned? Obviously it is a false bid) Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.