How to test the internal resistance and capacity of the lithium battery?

　　Author ：Iflowpower – Portable Power Station Supplier

Lithium battery internal resistance test method: According to physical formula R = U / I, the test equipment allows the lithium battery to force the battery in a short time (generally 2 to 3 seconds) to pass a large constant DC current (currently 40A to 80A) Large current), measure the voltage at both ends of the lithium battery at this time, and calculate the current lithium battery internal resistance according to the formula. 1. Measuring the open circuit voltage of the battery: U12, the battery is connected in parallel with a fixed resistance resistor: R, discharge; U1-U2) / (U2 / R) Lithium battery capacity test method: lithium battery capacity test is parameter with the full charge voltage and the settled termination voltage, because the lowest discharge voltage of the lithium battery is 2.

75V, so less than 3V The voltage has nothing to test for lithium battery; fixed current discharge is generally used, and the lithium battery is generally tested with 0.5C discharge. 1.

Filled the battery, the voltage of the single lithium battery charge is 4.2V; 2, use the multimeter to make the lithium battery constant current 0.5c, the corresponding battery capacity is discharged, the termination voltage is set to 3V; 3, Multiping the time with constant current discharge is the battery capacity; inspection: If the constant current discharge does not reach two hours, the nominal voltage is not enough, the lithium battery has the possibility of counterfeiting.

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