How to test the virtual standard capacity of large-capacity lithium-ion batteries?

1. A tool for measuring large-capacity lithium-ion batteries: a measuring ruler is used to quickly estimate the capacity of lithium-ion batteries. The commonly used estimation formula (estimation only): This is for the volume of the battery cell and does not include the battery casing. Battery capacityu003dthickness*width*length*K (K unit is mah/mm3) The range of K value is (0.07~0.11), the K value depends on the size of the capacity, the larger the capacity, the larger the K value, and the smaller the capacity. The smaller the K value (can be understood as the larger the size, the larger the K value). In actual calculations, the K value can be set to 0.1 by default. For example, 103450LP (thickness 10mm, width 34mm, length 50mm), calculated capacityu003d10*34*50*0.1u003d1700, the actual capacity is above 1800mah; for example, 603048LP (thickness 6mm, width 30mm, length 48mm), calculated capacityu003d6* 30*48*0.1u003d864, the actual capacity can be 900mah. 2. Prepare a galvanometer lithium-ion battery capacity u003d voltage × discharge current × discharge time. I believe many friends who have studied physics know how to calculate it. 3. A rated current discharge electrical equipment, for example, a light bulb is directly connected to discharge until the light is dimly extinguished, record the time t, a large-capacity lithium-ion battery can roughly calculate C: Cu003dUIt lithium-ion battery open circuit voltage and The corresponding relationship of battery capacity is generally as follows, the percentage is the remaining capacity of the battery, and the right side is the open circuit voltage (OCV) of the corresponding battery. 100%-4.20V90%4.06V80%3.98V70%3.92V60%3.87V50%3.82V40%3.79 V30%3.77V20%3.74V10%3.68V5%3.45V0%3.00V This is a friend who has been doing battery cell processing for many years to share relevant experience. From the data point of view, you can also use a universal voltmeter to make large-capacity lithium ion For the battery, first look at the remaining power of the large-capacity lithium-ion battery, and then measure the voltage, and then you can probably make a judgment. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.