Regarding how to detect the capacity of lithium batteries, I think many people know that the reason why we have to detect the capacity of the lithium battery is whether the manufacturer is faked, and the other is whether the battery manufacturer's battery is true, and the other is the other, and the other is one. That is, we have to look at the actual capacity of lithium batteries to see if it can reach the design of the design. Here are some simple methods to test lithium battery capacity.

　　1. Test on the actual use of lithium batteries

　　Because the minimum discharge voltage of the lithium battery is 2.75 V, the voltage below 3 V is not meaningful for the test of the lithium battery; the discharge of the fixed current is usually represented by C, and the discharge of the lithium battery is usually 0.5 C.

　　If the battery is charged, the voltage of a lithium battery charging is 4.2 V. When using a multimeter, it is a lithium battery of 0.5 c at a constant flow. The discharge time is multiplied with the discharge current, that is, the battery capacity; inspection: If it cannot last for 2 hours under constant current, it means that the rated voltage is insufficient and the lithium battery may be faked. There is a dedicated lithium battery pressure device. For everyone, you can choose a adjustable load resistor and a adjustable DC power supply to calculate the battery power according to the charging and discharge time.

　　2. The formula calculation and estimation of the lithium battery capacity

　　The capacity of the battery is related to the size, thickness, width, length and other factors of the battery. In addition, the material and size of the battery affect it. There is a certain linear relationship between the capacity and volume of the polymer lithium battery, and its calculation method is cumbersome. There are many factors that are considered, such as different materials, which will greatly affect the actual ability, and as the size increases, the capacity/volume ratio will also increase.

　　Fast estimation of polymer battery capacity, the generally used calculation formula (only estimated):

　　Volume = thickness*width*long*k (K unit is MAH/MM3)

　　The value of K is within the range of (0.07 ~ 0.11). The size of K is related to the industry and ability of the material. As the capacity increases, the K value increases, and the capacity decreases, and the K value is reduced (the K value can Explained as a larger size). In actual calculations, the value of K can be set to 0.1. For example, 103450 LP (10 mm thick, 34 mm width, 50 mm), its computing power is 10*34*50*0.1 = 1700, the actual capacity is 1800 mAh; ), Its capacity is 6*30*48*0.1 = 864, and its real capacity can reach 900 mAh.

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