Lithium-ion battery self-discharge rapid screening device and screening method based on DC impedance
A lithium-ion battery and DC impedance technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of misjudgment of measurement accuracy, low recognition rate of slightly self-discharging cells, and time-consuming problems. Achieve the effects of improving accuracy, saving manpower and equipment investment, and improving production efficiency
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Embodiment 1
[0022] The battery cell is selected as a 20ah ternary / lithium titanate cylindrical battery cell, and the shipping state is 50% SOC. At the end of the formation, the battery cell is charged or discharged to the shipping state, and then this test is performed. Install the above-mentioned cells into the cell filling position of the lower busbar, connect the upper busbar and the lower busbar to the charging and discharging machine of the high-current charging and discharging equipment, and use the charging and discharging machine to charge the screening device with a current of 2C×7 for 5s, read Take the current of the 5th second, and the specific values are shown in Table 1;
[0023] Table 1
[0024]
[0025]
[0026] According to the data in Table 1, it can be seen that the current value of the No. 5 cell is significantly higher than that of the other 6 groups, which means it is a defective cell. In order to further verify, the above-mentioned cell was fully charged and ...
Embodiment 2
[0031] Select the battery cell as a 20ah ternary / lithium titanate cylindrical battery cell, and the shipping state is 50% SOC. At the end of the formation, charge or discharge the battery cell to the shipping state to perform this test. This test expands the sample size to 28 single cells.
[0032] First test the 28 batteries by the standing method, and after standing at high temperature for 3 days, detect the OCV difference. The test data are shown in Table 3, and the unit is V;
[0033] table 3
[0034]
[0035]
[0036] According to the data in Table 3, the test results are all normal, and the 28 single cells have no defective cells. Then divide the 28 cells into 4 groups, install them in the lower busbar, connect them to the upper busbar in turn, charge the screening device with a current of 5C×7 for 5s, and read the current of the 5th second. The specific value is as follows: Table 4;
[0037] Table 4
[0038] serial number 1 2 3 4 5 6 7 Cu...
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