With the development of science and technology, lithium batteries have become more and more widely used in various industries, ranging 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 explosion of the lithium battery on the mobile phone, or because we use it improperly, or the quality of the lithium battery itself is not qualified. Lithium batteries must pass safety tests such as overcharging, short-circuiting, needling, crushing, and impact with heavy objects. 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 has reached the specified safety indicators?
This can be detected in three ways:
Method 1: Extrude the battery fully on the test plane of the testing machine, then apply a 13 + 1KN squeezing force with a hydraulic cylinder, and finally squeeze the battery by a 32mm diameter steel rod. If the lithium battery can withstand the maximum pressure and there is no explosion or fire, then the lithium battery product is qualified.
Method 2: After the impacted battery is fully charged, place it on the test plane of the testing machine, place a steel column with a diameter of 15.8mm vertically on the center of the battery, and freely drop a weight of 9.1kg from a height of 610mm to On the steel post above the battery. The battery should not ignite or explode.
Method 3: Overcharge test The so-called overcharge test is actually to test whether the internal lithium battery is stable. The method is very simple, first charge the battery with 1C, then perform an overcharge test according to 3C overcharge and 10V. When the battery is overcharged, the voltage Stable for a period of time when it reaches a certain voltage, and the battery voltage rises rapidly when it reaches a certain time. When it rises to a certain limit, the battery high cap is broken, and the voltage drops to 0V. During this process, the lithium battery did not explode or catch fire, which indicates that the lithium battery is a qualified product.
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Post time: Dec-18-2019