How to test the power of a lithium battery

Introduction How to Test Lithium Battery Power 1. Voltage Test Method: This method is relatively simple and is achieved by simply monitoring the battery voltage. But battery capacity and voltage are not linearly related.

How to test the power of a lithium battery

1. Voltage Test Method: This method is relatively simple and is achieved by simply monitoring the battery voltage. However, the relationship between battery power and voltage is not linear, so this testing method is not accurate. Especially when the mobile phone battery is below 50%, this method becomes very inaccurate.

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. measurement accuracy. But it is not simple to get an accurate data table, because the relationship between voltage and power also involves factors such as battery temperature, self-discharge and aging. Only by combining many correction factors can a more satisfactory power measurement be obtained.

3. ColorOmmeter: Connect a current sense resistor in series with the positive and negative electrodes of the battery. When current passes through the resistor, the coulombometer generates induction. The current flowing through the battery can be calculated, so it can accurately track changes in battery power to within 1% accuracy. This is the most accurate method of detecting battery power.

In addition to power testing, lithium batteries used in mobile phones also need to be tested for performance, mainly to ensure battery safety. During the test, a high-current shrapnel microneedle module with good conductivity was selected, which can maintain a stable connection and pass a current of 1-50A.

What is the reason why lithium batteries self-discharge too quickly? Self-dischargee is 400 millivolts in a month and the normal level is 15 to 20 millivolts

Lithium-ion battery reliability Sex test items include 1. Appearance size, internal resistance, voltage, test NTC, 2. Capacity test, 3. Discharge overcurrent protection test, 4. Charging overvoltage protection test, 5. Discharge overvoltage protection test, 6. Vibration test Free fall test 7. Abnormal load test Reverse load test Maximum current discharge test Short circuit protection test and so on.

When testing 3C lithium batteries, high-current shrapnel microneedle modules can be used to transmit large currents. The connection is very stable in the range of 1 to 50 A, without current attenuation, and has better connectivity features.

The self-discharge of 3C lithium batteries will be affected by the tetechnology, materials and storage environment. At the same time, self-discharge is also an indispensable part in the testing of 3C lithium batteries. Using the high current spring microneedle module of the battery test module as an auxiliary, it can adapt to large current transmission and small pitch areas, maintain a stable connection, and prevent the pins from to be stuck.

The reasons causing 3C lithium batteries to self-discharge are:

1. The insulation, uniformity, electronic insulation and tensile strength of the separator are poor;

>2. Loss of powder from the pole piece, misalignment of the winding, burrs on the current collector, etc. ;

3. There are conductive substances in the separator and impurities in the electrolyte and active material of the pole. piece.

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