How to judge the electrical properties of lithium-ion batteries?

Electrical performance:

(1) Rated capacity: 0.5 C discharge, not less than 2 H for individual cells, and not less than 1 h54 min (95 %) for batteries;

(2) 1C discharge capacity: 1C discharge, not less than 57 min (95 %) for individual cells, and not less than 54 min (90 %) for batteries;

(3) Low temperature discharge capacity: -20? Discharge of 0.5 C under C, not less than 1 h12 min (60 %) for either monomer or battery;

(4) High temperature discharge capacity: 55? Discharge of 0.5 C under C, not less than 1 h54 min (95 %) for individual cells, and not less than 1 h48 min (90 %) for batteries;

(5) Charging maintenance and recovery capacity: 28 days at full temperature, discharge time is not less than 1 h36 min (80 %), discharge time is not less than 1 h48 min(90 %);

(6) Storage performance: A single cell or battery undergoing storage test should be selected from a capacity of 50 to 60 tins before storage at an ambient temperature of 40 °C? C, relative humidity 45 <UNK> -75 <UNK> environment storage for 90 days. After the expiration of storage, take out the battery and set aside 1h with 0.2 C full charge, discharge with 0.5 C constant current to the termination voltage. The above test can be repeated 3 times and the discharge time is not less than 1h12 min (60 %);

(7) Cycle life: The cell or battery is charged with 0.2 C, the 0.5 C discharge is cycled, the test is stopped when the two consecutive discharge capacities are less than 72 min (60 %), the cycle life of the individual cell is not less than 600 times, and the battery cycle life is not less than 500 times;

(8) High temperature shelving life: The high temperature shelving life test should be selected from the single battery with a production date of less than three months. Before shelving, a capacity of 50 % ± 5 % should be filled, and then the ambient temperature is 55 °C ± 2? Section C is set aside for 7 days. After 7 days, remove the battery at an ambient temperature of 20 °C ± 5? Set 2 to 5 H under C. The battery is first discharged to the termination voltage at 0.5 C, charged at 0.2 C after 0.5 H, placed at 0.5 H, and then discharged at 0.5 C constant current to the termination voltage, with this capacity as the recovery capacity. The above step is a one-week cycle until the discharge time is less than 72 min (60 %) and the test is over. The shelving life is not less than 56 days (8 weeks cycle).

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