How to test low temperature batteries?

How to test low-temperature batteries? Low battery charge and discharge tests commonly used constant current, constant voltage charging, and constant current discharge modes. During the process of recording test data, such as the process of time, voltage and current changes through the analysis of data, the capacity of the battery Or material characterization, Coulomb efficiency, internal parameters of battery charging and discharging platform such as electrochemical performance parameters. The routine test procedure of the charge and discharge test is to install the test battery on the test instrument and place it in the test environment at (25±1)℃. Set the following procedures: stand for 10 minutes; charge at a constant current of 1.0c to 4.2v, at this time the constant voltage charging current drops to 0.05c, and the charging stops; stand for 5 minutes, the current is 1.0c, and the current is constant at 3.0v. Repeat the above charging and discharging steps 5-10 times. When testing the actual capacity of the battery material, try to use a small multiplier for charging and discharging to reduce the capacity error caused by polarization and obtain the true capacity of the battery. Generally choose a multiplier of 0.1c for testing. Operators should wear insulated gloves, face shields and protective glasses when loading and unloading the buckle battery on the test instrument. Due to the large number of detection channels, special marks should be made on the detection battery and detection channels, and eye-catching labels should be placed in front of the relevant instruments to prevent misoperation by others. The conventional test procedure of the multiplier charge and discharge test is generally divided into three forms: the same multiple charge and discharge and different multiple discharge; different multiple charge and discharge and different multiple charge and discharge tests. The following is an example of a button battery test, the charging and discharging voltage window is 3.0~4.2v. Connect the battery to the test instrument and place it in a steady-state environment for 5 minutes. Discharge 3.0v, current 0.5c, charge and constant current 0.54.2vc stand for 10 minutes, and cut off 4.2v, constant voltage, the current drops to 0.05 degrees Celsius. Then conduct different forms of tests on different rates of charge and discharge. The experiment process of charging the same multiplier and discharging different multipliers is as follows: After standing for 5 minutes, discharge the different multipliers to 3.0v, and record the discharge capacity; after standing for 10 minutes, charge to 4.2v with a constant current of 0.5c, When the constant current voltage drops to 0.05c, it is cut off at 4.2v. The experimental process of charging the same multiplier and discharging in different reproductions is as follows: After standing for 5 minutes, the charge is continuously discharged to 3.0v 0.5c multiplier for 10 minutes, and then charging 4.2v in different reproductions and the current is reduced to 0.05 degrees to 4.2 v. The experimental process of charging and discharging at different multiplication rates is as follows: after standing for 5 minutes, the constant flow rate is at different multiplication rates to 3.0v, standing for 10 minutes, and then charging with constant current at the same multiplication rate (current) to 4.2v, and ending 4.2 At v, with a constant voltage, the current drops to 0.05 degrees Celsius. According to the test table, replace a different multiplier and repeat one of the above experimental steps, the charge and discharge multiplier from low to high (generally 0.2C, 0.5C, 1C, 2C, 5C and other higher multipliers). It is recommended to charge and discharge at the same speed for 5 to 10 times. In the conventional test procedure of charge-discharge cycle test, when testing the roundness of the battery, the number of cycles can be added according to the above-mentioned charge-discharge test (1 section), and the capacity retention rate after the same number of cycles can be compared. Or repeat the charge and discharge cycle, and continue twice when the discharge capacity is less than 80% of the initial discharge capacity. At this time, determine the number of cycles. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Analysis of low temperature performance of several batteries