Under what circumstances will the power bank explode?

Tips: The plastic shell is easy to damage the battery charging. 1. Non-professionals prevent the power bank from being disassembled and bumped. If the battery is found to be swollen or leaking, it may have a peculiar smell, you should stop using it immediately. 2. When going out, you should prevent putting the power bank and keys and other metal or hard objects together. The power bank should be reasonably placed in the suitcase to avoid collision, kneading, damage to the battery, and cause explosion and combustion. 3. Do not store the charger in an overheated, humid environment, and do not expose it to fire or use it in the sun. During the charging process, it is forbidden to place flammable and explosive materials around the power bank. 4. The charging time should not be too long to avoid explosion caused by overcharging or overheating of the body. Test 1: Affect the full charge method. The tester used a hammer of 1 kg from a height of 1 meter under two blasting shocks. The researchers used 6 flat-head lithium batteries, namely 1500mAh, 2200mAh and 2900mAh (one is fully charged and the other is not charged). The tester puts the flat-head lithium battery under the impact head of the impactor, hits a heavy hammer on the top of the impact head, makes it fall smoothly, and hits the battery after passing the impact head. When testing an uncharged battery, the battery did not break through the initial shock, but the surface showed dents. Before the third impact, the battery fluid was very sensitive to seepage, accompanied by a certain amount of gas and bubbles, in addition to smelling aroma. When you hit a fully charged battery, the first impact, the battery is still not penetrated. But after the second fall, the battery sparked a lot at the moment it penetrated and exploded two seconds later. The battery separated from the impactor and continued to burn. There is a lot of smoke and strong smell. The battery burned for half a minute before the fire went out. Three charged banks also responded similarly. Test 2: Burning At the moment of the big explosion, the flame was 2 meters high. The experiment used two very cheap banks, one for street vendors and the other for free perfume. Put the power bank into the iron plate, put in the combustion-supporting materials, ignite the combustion-supporting materials, and burn the power bank directly. The flame diameter is more than half a meter, and the flame height can reach two meters. After the explosion, the fragments of the charger were scattered around the iron plate, and the explosion fragments could be seen even at the edge of the incineration chamber a few meters away. Test 3: Salt water immersion temperature may exceed 50 degrees Celsius. When the human body sweats, what will happen to the power bank? The researchers prepared a bag of salt, a thermocouple thermometer, an iron plate and a rechargeable lithium battery. Load a certain concentration of salt water, put it in the tray, and then put the lithium battery in the tray. Connect the sensor of the thermometer. According to analysis, this action is used to imitate the scene of the congestion treasure with salty sweat when the human body is sweaty in summer. The test results flashed by. In the tray, the water gradually became dirty, blue-green liquid flowed out of the battery, and bubbles appeared, and there was a slight creaking sound throughout the process. The maximum temperature of the rechargeable battery is 51.3 degrees Celsius. Test 4: The maximum short-circuit temperature is about 130 degrees Celsius. Quite a lot of the public often carry metal objects like keys. There is an exposed part in the port of the power bank. Assume that the key was inserted accidentally. If the protection device of the power bank is not good enough, short circuit and heat will occur. Tester analysis. When using a new battery, short-circuit tests should be performed on thick copper wires, touch thermometers and other items. The current caused by the short-circuit of the battery is too sensitive to be heated, and the maximum temperature is about 130 degrees Celsius. The outer packaging of the battery melts quickly due to the high temperature, and the metal casing of the battery is exposed, but the electrolyte inside the battery will not leak. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Wide application areas of graphene batteries