The direct cause of a 21700 battery fire is that the heat of the rechargeable battery cannot be controlled. The so-called thermal runaway means that the battery is exposed to various stimuli and triggers an internal short circuit, causing the internal temperature of the battery to rise by thousands of degrees and the flammable electrolyte to boil and spurt out. It will burn on contact with air.

　　At present, there are three main reasons for short-circuit failure of rechargeable batteries: mechanical runaway, electrochemical runaway and temperature runaway.

　　The most common thing is that the rechargeable battery is damaged by squeezing or pinning, which will cause the diaphragm to be punctured, and the positive and negative plates will be immediately connected to the internal short circuit, releasing a lot of heat.

　　The most typical example is a school bus accident in Shenzhen, which caused the battery pack of a large truck to be overcrowded, causing a large-scale internal short-circuit failure. In the end, the truck was burned into an empty shell.

　　If the reasonable layout of rechargeable batteries is unscientific, problems will occur in long-term applications. The original Samsung SDI 21700 battery was used for rechargeable batteries due to the small space in the room. The external negative plate was squeezed and deformed due to short-circuit faults, which eventually led to several cases. Fire safety incident.

　　There are many reasons why electrophotocatalysis cannot be controlled. Poor quality of rechargeable batteries is the main cause of diseases. At the same time, when there is a problem with SDI lithium power supply, the pressure on production capacity is put on ATL lithium power supply. This reduces the quality of these rechargeable batteries, causing the residual amount of negative copper and capillary composition inside the rechargeable batteries to exceed standards.

　　In battery cars, excessive battery charging and high-current fast charging are the main reasons why they cannot be controlled by photoelectrocatalysis.

　　When battery vehicles use non-standard car charging piles, the charging piles may absorb large currents that lithium-ion cars cannot withstand. In rechargeable batteries, the charging speed is too fast, causing the lithium-ion battery to develop dendritic twins in the negative layer. The twin crystal is as thin and hard as a needle. When the twin crystal grows to a certain length, it will destroy the diaphragm and cause a short circuit failure.

　　It is worth mentioning that in the non-compliant management of the car charging pile, there will be too many batteries being charged. When the rechargeable battery is full and the battery is charged again, the negative potential of the rechargeable battery will be inserted into a large number of lithium-ion batteries. When the maximum carrying capacity of the negative potential is exceeded, the battery will collapse, causing a short circuit failure inside the battery drum. A recent accident in Dongguan caused an electric car to catch fire, possibly related to overcharging and fast charging.

　　The key is that lithium is very cold, and when lithium is charged at high temperatures, the positive and negative films create additional reflections, releasing carbon dioxide and additional heat. The influence of various heat sources can easily cause the diaphragm to dissolve, causing large-scale short circuit failure. It's summer and many battery chargers charge batteries under the hot sun, and if their heat pipes don't work, it's easy for the heat generated by the batteries to get out of hand.

　　Rechargeable batteries are dangerous and even life-threatening, so car and phone manufacturers have figured out ways to maintain them.

　　In the 3c rechargeable battery industry, since the explosion of Note 7, the application of lithium-ion batteries has changed from lithium batteries to lithium batteries to lithium polymer lithium batteries. The lithium-ion batteries in the previous flammable liquid lithium batteries have been suspected of colloidal lithium-ion battery electrolysis. Replaced by liquid, even if the battery is broken, most of them are activated and will not explode.

　　On the side of the battery car, since the rubber-like power 21700 battery cannot meet the loading requirements temporarily, we can only find a way to maintain the battery as best as possible.

　　Lithium is afraid of being poked and squeezed, so anti-slip raw materials are added to the outside of the battery, and the bottom is coated on the coating.

　　Lithium is afraid of fast charging and overcharging, so a rechargeable battery intelligent management system is developed to synchronously control the battery charging current and supervise the health of each battery.

　　Lithium is sensitive to cold, so we made a water cooling system for lithium to prevent overheating.

　　In the new national industrial standards, the heat generated by lithium-ion batteries cannot be controlled to ensure no fire and no explosion within five minutes. If the battery car on your seat catches fire, quickly cover your mouth and nose and try to get out of the car. If you get off more than 15 meters without trying to put out the fire, you have a chance to escape after the battery catches fire.

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