It is certainly safe to use professional capacity testers, internal resistance meters and aging equipment to test 18650 lithium batteries, but this is a professional situation.
If ordinary people want to test the capacity of 18650 lithium battery, they can use the comparison method. Three things are necessary:
1. A standard capacity 18650 lithium battery
You can choose real Samsung 2600mah, which has stable quality.
2. A container and a battery test circuit
Buy a solderless mobile power sleeve (spring loaded) and use it to make a container and a battery test circuit.
3. A 1A Dummy Load Resistor
You can buy a dummy load resistor (1A current) online to test the power bank. Although the production is approximate, the same is usedFor. comparison tests.
Always reliable.
Put the Samsung 2600mAh battery into the mobile power test container, connect the dummy load and start recording the discharge time. It will take approximately 100 minutes before the charging light turns off.
Get this basic setting. Other batteries to be tested may function in the same way. By comparing the test parameters obtained with Samsung batteries, you can find out the approximate capacity of the tested battery.
How to measure the capacity of a lithium battery? How to measure with a multimeter.
To measure battery capacity, you can get the battery capacity by charging or discharging. If you search for “USB voltage display” online, you can see the corresponding products. Choose one with a capacity display. . For products (available in levels above 20), you canPlease discharge the battery to a voltage of 3.5V first, then use the charger to charge. The battery and charger are connected through this product. Once the battery is fully charged, the battery charges. The level will be displayed.
The other is to obtain the capacity through a simple discharge method, which is only a reference value and is not precise. When the battery is fully charged, use a charge to discharge it, for example, fully charge 4.2. V, discharge current 1A, discharge to 3.5V, and calculate the discharge time. It is not allowed to discharge below 4.2V. The voltage will decrease and the current will also decrease, so it is only for reference. .
What are the testing standards for lithium batteries?
The multimeter cannot measure battery capacity. Battery capacity refers to the total amount of electricity released once the batteryrie is fully charged and discharged until it stops discharging. In other words, capacity Q = product of current I and discharge time t. There are special instruments for measuring other battery parameters, such as battery testers.
A multimeter is a magnetoelectric instrument with a rectifier that can measure various electrical parameters such as alternating and direct current, voltage and resistance. For each electrical quantity, there are generally several ranges.
Also known as a multimeter or simply multimeter. The multimeter is composed of a magnetoelectric ammeter (meter head), a measuring circuit and a selector. By changing the selection switch, various electrical parameters can be measured easily.
Detailed information:
1. Before using a multimeter. , you must first perform a "mechanical zero adjustment", that is, point the multimeter pointer to the zero voltage or zero current position when no electricity is measured.
2. When using the multimeter, do not touch the metal part of the test lead with your hands. This can guarantee measurement accuracy on the one hand and personal safety on the other hand.
3. When you measure a certain amount of electricity, you cannot change speed during measurement, especially when measuring high voltage or large current, you need to pay more attention. Otherwise, the multimeter will be damaged. If you need to change gears, you must first disconnect the test leads and then measure after changing gears.
4. When using the multimeter, it should be placed horizontally to avoid errors. At the same time, heCare should also be taken to avoid the influence of external magnetic fields on the multimeter.
5. After using the multimeter, the transfer switch should be set to the maximum AC voltage range. If it is not used for a long time, the battery inside the multimeter should also be removed to prevent it from corroding other components of the multimeter.
Reference documents:
1. Voltage measurement method
That is, the battery power is obtained by simply monitoring the battery voltage. Advantages of this method: simplicity Disadvantages: imprecise, the precision of the power measurement is only greater than 20%. Especially when the battery charge is less than 50%, the phone power calculation will become very inaccurate. The protection of the battery by thisThis method is therefore very limited.
2. Battery modeling method
This method involves creating a data table based on the battery discharge curve. The data table will show the power values at different voltages. Advantages: More accurate than the voltage test method. Disadvantages: Obtaining an accurate data sheet is not simple because the relationship between voltage and power also involves factors such as battery temperature, self-discharge, and aging.
Early developments of lithium batteries
Lithium batteries were first used in pacemakers. Lithium batteries have the advantages of extremely low self-discharge rate and gentle discharge voltage, allowing pacemakers implanted in the human body to work for a long time without recharging. Lithium batteries generally have a nominal voltageale greater than 3.0 volts and are best suited for use as an integrated circuit power supply. Manganese dioxide batteries are widely used in calculators, digital cameras and watches.
In order to develop more efficient varieties, various materials were researched to create unprecedented products.
In 1992, Sony successfully developed lithium-ion batteries. Its practicality has significantly reduced the weight and volume of portable electronic devices such as cell phones, laptops and calculators.