UL's testing on power lithium-ion batteries currently has seven main standards, which are: shell, electrolyte, use (overcurrent protection), leakage, mechanical test, charging and discharging test, and marking. Among these two parts, the mechanical test and the charging and discharging test are the two more important parts. Mechanical test, that is, through the mechanical force and the transformation of mechanical force, the power lithium-ion battery is under pressure, the state presented is the result of mechanical test.
Mechanical test mainly includes compression test, collision test, acceleration test, vibration test, thermal test, thermal cycling test, high altitude simulation test and other seven content, through the above test, qualified lithium-ion battery must meet the three requirements of no leakage, no fire, no explosion, to be considered qualified.
Charge and discharge test, that is, the experimental method to judge the performance of lithium-ion batteries by the performance of the battery in normal and abnormal states.
The charge/discharge test also contains five elements: charge/discharge test, short circuit test, abnormal charging test, forced discharge test, and overcharge test.
Among them, the charge/discharge cycle is a normal experiment, which requires that at 25℃, the battery cell is subjected to a charge/discharge cycle according to the manufacturer's requirements, and the cycle is terminated when the capacity is 25% of the initial nominal capacity, or after a continuous cycle of 90 days, without any safety incidents. The remaining four items were not normal, namely "three over and one short", which are "overcharge", "over discharge", "over current "overcharge", "overdischarge", "overcurrent" and "short circuit".
Power lithium-ion batteries were tested for resistance to overcharging, overdischarging, high currents, and short circuits. The scientific use of lithium-ion battery charging can have a serious impact on the life of lithium-ion batteries.
Post time: Jul-21-2023