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How to detect whether the lithium battery reaches the specified safety index

by:dcfpower     2021-02-28
u003cpu003eWith the development of science and technology, the application of lithium batteries in all walks of life has become more and more extensive, from electronic watches and mobile phones to laptop computers and automobiles. However, in the process of using lithium batteries, we will also encounter some safety hazards, such as: the lithium battery pack on the mobile phone explodes, or it is because of our improper use, or the quality of the lithium battery itself is unqualified. Lithium batteries must pass safety tests such as overcharge, short circuit, needle stick, squeeze, heavy object impact, etc. If the lithium battery does not catch fire or explode, it means that such a lithium battery is a qualified product, otherwise it is an unqualified product. The key is how to detect whether the lithium battery pack reaches the specified safety indicators? The following three methods can be used to detect:u003c/pu003eu003cpu003eu003c/pu003eu003cpu003eMethod 1: Vigorously squeezeu003c/pu003eu003cpu003eFirst put the fully charged battery under test on the test plane of the testing machine Then use a hydraulic cylinder to apply 13+1KN squeezing force, and finally squeeze the battery by a steel rod with a diameter of 32mm. If the lithium battery can withstand the maximum pressure and there is no explosion or fire, it means the lithium battery product Is qualified. Method 2: After being hit by a heavy object, the battery under test is fully charged and placed on the test plane of the testing machine. A steel column with a diameter of 15.8mm is placed vertically at the center of the battery, and a heavy object weighing 9.1kg is freely dropped from a height of 610mm. On the steel pillar above the battery. The battery does not fire or explode. Method 3: Overcharge test The so-called overcharge test is actually to test whether the internal stability of the lithium battery pack is stable. The method is very simple. First, fully charge the battery with 1C, and then perform an overcharge test according to 3C overcharge 10V. When the battery is overcharged, the voltage When it rises to a certain voltage, it is stable for a period of time. When it is close to a certain time, the battery voltage rises rapidly. When it reaches a certain limit, the battery top cap is pulled off and the voltage drops to 0V. During this process, the lithium battery did not explode or catch fire, which means that the lithium battery is a qualified product. u003c/pu003eu003c/pu003e
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