How to test low temperature cells?

　　Author ：Iflowpower – Portable Power Station Supplier

How to test low temperature battery? Low battery charging and discharging test common constant current, constant voltage charging, constant current discharge mode, record test data, such as time, voltage, and current pass through changes in analysis data, battery capacity Or material characterization, coulomb efficiency, internal parameters of battery charge and discharge platforms such as electrochemical performance parameters. Charge and discharge test conventional test procedure will test the battery on the test instrument, place it (25±1) In the test environment of ¡ã C. Set the following procedure: stand for 10 minutes; charge the constant current to 4.

2V at 1.0C, at this time, the constant voltage charging current drops to 0.05c, stopped; standing for 5 minutes, the current is 1.

0c, constant 3.0V. Repeat the above charge and discharge step 5 ~ 10 times.

When testing the actual capacity of the battery material, try to use a small multiplier to charge and discharge to reduce the capacity error caused by polarization and obtain the real capacity of the battery. Generally selecting the multiplier of 0.1c for testing.

When the operator is loaded with a buckle battery on the test instrument, the insulated glove, mask and protective glasses should be worn. Due to many detection channels, special tags should be made on the detection battery and detection channel, and place the eye-catching label before the related instrument, prevent others' misuse. Multiple charge and discharge test in multiplier charge and discharge test is generally divided into three forms: the same multiple charge and discharge and different multi-discharge; different multi-charge and discharge and different multi-charge and discharge test.

Below is an example of a button battery test, the charge and discharge voltage window is 3.0 ~ 4.2V.

Battery connection to test instruments and place in a steady-state environment for 5 minutes. 3.0V, current 0.

5c, charge and constant current 0.54.2Vc station for 10 minutes, and cut off 4.

2V, constant voltage, current drops to 0.05 degrees Celsius. Then different forms of testing of different rates of charge and discharge.

The experimental process of the same multiplier charging, different multiplier discharges is as follows: After 5 minutes, discharge different multipliers to 3.0V, record discharge capacity; after standing for 10 minutes, charge the constant current to 4.2V, When the constant current is lowered to 0.

05c, cut off at 4.2V. The experimental process and discharging of the same multiplier is collected in different reproduction: After 5 minutes, the charge is constantly discharged to 3.

0V0.5C multiplier 10 minutes, then charge 4.2V in different reproduction and current reduction to 0.

05 degrees 4.2 v. The experimental process of charging and discharging is as follows: Station 5 minutes later, the constant current is at different multiplication interest rates to 3.

0V, station for 10 minutes, then charge (current) to 4.2V, and deadline 4.2 V, constant voltage, current dropped to 0.

05 degrees Celsius. According to the test table, replace the different multipliers to repeat one of the above experimental steps, charge and discharge reinforcers from low to high (typically 0.2c, 0.

5c, 1c, 2c, 5c, etc.). It is recommended to charge and discharge with the same speed of 5 ~ 10 times.

When the charge and discharge cycle test routine test flow can be added according to the above charge and discharge test (1 section), and the capacity retention ratio after the same cycle is compared. Or repeated charge circulation, when the discharge capacity is less than 80% of the initial discharge capacity, the number of cycles is determined at this time.