In the era of touch-screen mobile phones, rechargeable treasure is a necessary tool for people to travel. When we take the plane, we will find that the charging treasure is not allowed to be put in the luggage for shipment, because the charging treasure may be on fire and explode when it is squeezed and collided in a narrow space.
Caution: the battery core is easy to be damaged by the plastic case charger
1. Unprofessional personnel are forbidden to dismantle and impact the charging battery. If the battery is found to be bulging, leaking or smelly, it shall be stopped immediately.
2. When going out, it is necessary to avoid placing the power bank together with the metal and hard objects such as the key, etc. it is necessary to place the power bank reasonably in the trunk to avoid impact, and to prevent it from being squeezed or impacted to damage the electric core and causing explosion and combustion.
3. Do not store the battery charger in the overheated and humid environment, and do not touch the fire, or use it in the sun. During the charging process, it is forbidden to place inflammable and combustible materials around the charging treasure.
4. The charging time shall not be too long to prevent the charger or the body from overheating and explosion due to over charging.
Experiment 1: explosion after 2 shocks in full charge mode
The experimenter hit the battery with an impact weight of 1kg from a height of 1m. The experimenter successively used six flat head lithium batteries, two for 1500mah, 2200mAh and 2900mah respectively (one is fully charged and the other is not charged).
The experimenter put the flat head lithium battery under the impact head of the impactor, stuck the hammer at the highest place, and then let it fall freely, and then impact the battery through the impact head. During the test of the uncharged battery, the battery was not penetrated in the first impact, but the surface was dented. Until the impact to the third time, the battery liquid quickly exudes, accompanied by a certain amount of smoke and bubbles, in addition to fragrant smell.
When the battery is fully charged, the battery is not penetrated for the first time. But after the second hit, at the moment of penetration, a lot of sparks came out of the battery, and only two seconds later, the battery exploded. The battery breaks away from the impactor and continues to burn. There is a lot of smoke and a pungent fragrance on site. The battery burned for half a minute before the fire died out. The response of the three charged batteries is similar.
Experiment 2: the flame height at the moment of big explosion is up to 2M
The experiment uses two very cheap charging treasure, one is the stall goods charging treasure, the other is the Gift Perfume charging treasure, all use kerosene and other combustion supporting materials to burn. The experimenter put the charging treasure into the iron plate, put the combustion supporting substance, ignite the combustion supporting substance with fire, and burn the charging treasure directly.
When the power bank explodes, the flame diameter exceeds half a meter, and the flame height reaches two meters. After the explosion, the fragments of the power bank were distributed around the iron plate, and even at the edge of the combustion chamber a few meters away, the wreckage of the explosion could be seen.
Experiment 3: salt water immersion temperature may exceed 50 ℃
When the human body is sweating, what happens when the sweat saturates the rechargeable battery? The experimenter prepared a bag of salt, a thermocouple thermometer, an iron plate and a rechargeable lithium battery. Configure a certain concentration of salt water, put it into the tray, and then put the lithium battery into the tray. Connect the sensor of the thermometer. According to reports, the move was used to simulate the situation when the human body sweats a lot in summer and some sweat with salt enters the rechargeable battery.
The experimental results show that the water in the tray becomes turbid gradually, the blue-green liquid flows out of the battery and bubbles appear, and there is a slight squeak in the whole process. The maximum temperature of the rechargeable battery displayed by the thermometer is 51.3 ℃.
Experiment 4: the maximum temperature of short circuit is about 130 ℃
'many citizens often carry metal objects such as keys. If the key is inserted carelessly, if the protection device of the charger is not good, there will be short circuit and then heat. "Introduction of the experimenter.
In the short circuit experiment with new cores, thick copper wires, contact thermometers and other items, the core temperature rises rapidly due to the excessive current caused by the short circuit, and the maximum temperature is about 130 ℃. Due to the high temperature, the outer packing skin of the electric core melts rapidly, exposing the metal shell of the electric core, but the electrolyte inside the electric core does not leak.