With the development trend of lithium batteries,High capacity lithium batteryThe direction is an important factor of concern in the battery consumer market. In order to meet customer requirements, many lithium battery manufacturers, coupled with fierce competition in the manufacturing industry, now have serious false capacity standards for high-capacity lithium batteries. Many battery manufacturers have specific lithium batteries. The capacity is different from the capacity of the advertising logo, and the different sizes are related to the price level.

So how to detect whether the capacity of a high-capacity lithium battery has a false standard? If the capacity is a false standard, what is the capacity of the virtual standard? Let us discuss it together below.

1. Special tool for accurately measuring high-capacity lithium batteries: measuring ruler

To quickly estimate the capacity of a lithium battery, the commonly used estimation formula (only used for estimation) is: This is calculated based on the volume of the lithium battery cell and does not include the battery casing.

Battery capacity=thickness, width, length K (K unit is mah\/mm3)

The range of K value is (0.070.11). 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 (it can be understood that the larger the size, the larger the K value).

For specific calculations, the K value can be set to 0.1 by default. For example, 103450LP (thickness 10mm, width 34mm, length 50mm), calculated capacity=1034500.1=1700, the actual capacity is more than 1800mah; for example, 603048LP (thickness 6mm, width 30mm, length 48mm) ), computing capacity=630480.1=864, the specific capacity can guarantee 900mah.

2. Prepare a galvanometer

Lithium battery capacity=operating voltage, discharge current, discharge time

I believe many friends who have studied physics know how to calculate this.

3. An electrical device with a rated current discharge, such as a light bulb

Just connect it and start discharging until the light bulb goes out. Record the time t, and the high-capacity lithium battery can roughly calculate C:

C=UIt

The corresponding relationship between the open circuit voltage of high-capacity lithium batteries and the 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 matching battery.

100 percent----4.20V

90 percent-----4.06V

80 percent-----3.98V

70 percent-----3.92V

60 percent---3.87V

50 percent---3.82V

40%-----3.79V

30 percent---3.77V

20 percent--3.74V

10%-----3.68V

5 percentage------3.45V

0 percentage---3.00V

This is a shared experience from a friend who has been manufacturing battery cells for many years. From a data point of view, you can also use a universal voltmeter to make high-capacity lithium batteries. That is to check the remaining power of the high-capacity lithium battery, and then By measuring the voltage and matching it, you can roughly make a judgment.