How to detect the capacity of a large-capacity lithium-ion battery

How to detect the capacity of large-capacity lithium-ion batteries? There is a gap between the actual capacity of lithium-ion batteries of many battery manufacturers and the advertised capacity, depending on the price level. In order to meet consumer demand and the fierce competition in the industry, many lithium-ion battery manufacturers have serious false standards for the capacity of large-capacity lithium-ion batteries; then how to detect whether the capacity of large-capacity lithium-ion batteries has false standards? If the capacity of the virtual standard, what is the capacity of the virtual standard? Let us discuss it together below. 1. A tool for measuring large-capacity lithium-ion batteries: a measuring ruler can quickly estimate the capacity of lithium-ion batteries. The commonly used estimation formula (estimate only): This is for the volume of the battery cell and does not include the battery casing. Battery capacity u003d thickness * 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, 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 an ammeter, lithium-ion battery capacity u003d voltage × discharge current × discharge time. I believe that many friends who have studied physics know how to calculate it. 3. A rated current discharge electrical equipment, such as a light bulb 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 producing battery cells 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, then measure the voltage, and make a corresponding 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. Previous post: Ranking of lithium battery manufacturers in 2020, what are the high-quality lithium battery manufacturers?