How to detect the capacity of high-capacity lithium-ion batteries, many battery manufacturers have a gap between the actual capacity of lithium-ion batteries and the advertised capacity, there are large and small, related to the price level. Many lithium-ion battery manufacturers in order to meet consumer demand, coupled with intense competition in the industry, high-capacity lithium-ion batteries with serious capacity misrepresentation.
So how to detect the capacity of high-capacity lithium-ion batteries have no false label? If the false label capacity, the false label capacity and how much it is? Let's discuss it below.
1, measuring tools for high-capacity lithium-ion batteries: measurement ruler
A quick estimate of the capacity of lithium-ion batteries, often used to estimate the formula (only with estimates): this is the volume of the cell to count, not including the battery shell.
Battery capacity = thickness * width * length * K (K unit is mah/mm3)
The range of K value is (0.07~0.11), 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).
The actual calculation, you can default the K value to 0.1. For example, 103450LP (10mm thick, 34mm wide, 50mm long), the calculated capacity = 10*34*50*0.1 = 1700, the actual capacity of more than 1800mah; for example, 603048LP (6mm thick, 30mm wide, 48mm long), the calculated capacity = 6*30*48*0.1 = 864, the actual capacity can do 900mah.
2、Prepare an ammeter
Lithium-ion battery capacity = voltage × discharge current × discharge time
I believe that many friends who have studied physics know how to calculate it.
3, a rated current discharge of electrical equipment, such as electric lamps
Directly connected to the discharge, until the lamp dimly extinguished, record the time t, high-capacity lithium-ion batteries can be calculated roughly C: C = UIt
C = UIt
Lithium-ion battery open circuit voltage and battery capacity correspondence is generally as follows, the percentage is the remaining capacity of the battery, the right side is the corresponding battery open circuit voltage (OCV). 100% - 4.20V
90% - 4.06V
80%--3.98V
70% - 3.92V
60% - 3.87V
50% - 3.82V
40% - 3.79V
30%-3.77V
20%-3.74V
10% - 3.68V
5% - 3.45V
0%-3.00V
This is to do battery cell production for many years of friends to do a share related experience, from the data, you can also use the universal voltmeter to do high-capacity lithium-ion batteries, that is, first look at the remaining power of high-capacity lithium-ion batteries, and then go to measure the voltage, with which to do the corresponding, you can probably make a judgment.
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