18650 lithium battery capacity measurement procedure
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2023/05/30 11:33:59
With the development of society, energy storage lithium battery occupies a more and more important position in society. By the end of 2015, China's installed energy storage capacity was 22.8GW, accounting for about 1.7% of the country's total installed power capacity. It is expected that by 2025, the energy storage lithium battery industry will achieve large-scale development, form a relatively complete industrial system, and become a new economic growth point in the energy sector. At present, there are three main application fields in the lithium energy storage market: electric energy storage, household energy storage and base station energy storage. The backup power field of communication base station currently accounts for a large proportion, accounting for nearly half of the entire lithium energy storage battery market. The capacity of lithium battery is the premise of how long the device can be used. So friends know how to measure lithium battery capacity is more accurate? There is a certain deviation between the nominal capacity and the actual capacity of the general manufacturer. To understand the steps of 18650 lithium battery capacity measurement, we will learn it together.
First, 18650 lithium battery capacity measurement method steps
1, simple method constant resistance discharge. You need a multimeter and a high power resistor, and you can charge it up first, you can charge it up in a room, on a plane, on a cell phone. The battery is connected to the resistance with a full load, usually a cement resistance of 10 ohm and 5W, and discharged until the voltage is lower than 2.75V, the total discharge time capacity is 0.37A* time. This method is relatively simple, but there is some error.
2. Formal method: With battery capacity detector, first charge to 4.20V, and then use 1 hour constant exile, arbitration method is 0.2 times, such as 1000mAh capacity, with 200mA constant discharge to 2.75V cut-off, calculation time time * constant current = battery capacity this is in accordance with the national standard 18287 lithium battery provisions to do. If it is nickel metal hydride battery, the same, but the charging way is not constant voltage, and the discharge is up to 1.0V each section of this method requires special equipment.
Second, 18650 lithium battery capacity measurement method steps
Method 1:
There are professional battery compartments
If you're an individual, find an adjustable load resistor and a DC power source with an adjustable current to calculate battery capacity by charging and discharging time,
Charging current x charging time = battery capacity (from 2.7V or 3.0V charging to 4.2V)
or
Discharge current x discharge time = battery capacity (from 4.2V discharge to 2.7V or 3.0V)
Method 2:
The first step is to fully charge the battery to its rated voltage, which is generally 4.2V
The second step is to discharge the battery to its rated voltage and record how much power is released. The voltage is generally 3.0V
The third step is to charge the battery to the normal amount, which is generally set at 3.8V-4.0V
The capacity recorded in step 2 is the capacity of the battery.
Method 3:
The integration function of the power meter can be used to measure the capacity of lithium battery required by the equipment. I usually use the power meter of PA310 Zhiyuan * to measure the capacity of lithium battery. After measuring the capacity, I can select the battery with larger capacity for the use of the equipment.
The steps for measuring 18650 lithium battery capacity are as follows. The 18650 battery usually has a capacity of less than 3,100mah (the limit is 3,400mah, and anything over that is a fake and could explode. I'm buying a highlighter flashlight with a 5000mAh battery, right? It's obviously an imaginary index).
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