How to prevent and deal with the spontaneous combustion of lithium-ion batteries

Methods to prevent spontaneous combustion during use Although the battery is processed to improve safety performance and reduce the probability of fire, consumers should also pay attention to the following aspects during use: Use a charger that matches the battery as the battery Recharge. In order to reduce costs, the market is flooded with a large number of low-quality chargers, and the safety performance cannot be guaranteed. The battery charger is essentially a small transformer, if it does not match the performance of the battery, it will cause damage to the battery. Don't talk while the phone is charging. The battery will heat up when the phone is charging. If you continue to talk at the same time, the heat will increase rapidly, which is easy to cause danger. The reasonable temperature range for charging lithium-ion batteries is 0℃～45℃, and the reasonable temperature range for discharging is -20℃～60℃. If the temperature of the battery during charging is lower than 0°C, metallic lithium ions will be precipitated on the positive electrode of the battery, making the battery more sensitive to vibration or impact, and adding danger. Lithium-ion batteries that are not usually used are best placed in a sturdy insulated container, and prevent it from being exposed to water, or placed in an environment that does not exceed 100°C. When carrying lithium-ion batteries, keep away from other metal objects, such as keys, lighters, scissors, etc. In order to prevent sparks from the friction of the USB metal sheet, the easiest and most feasible method is to put a plastic bag on the outside of the battery. The plastic packaging bag that comes with the original battery is ideal. Prevent the battery from being overcharged or over-discharged, both of which will destroy the protection circuit inside the battery. In places where a large amount of lithium-ion batteries are stored, attention should be paid to controlling the ambient temperature to prevent external impact. Do not open or disassemble the battery at will under any circumstances. Otherwise it will cause a short circuit of the battery cells. 02Emergency measures Although a series of preventive measures have been taken, the possibility of spontaneous combustion of lithium-ion batteries still exists. If spontaneous combustion of a lithium ion battery occurs, the emergency treatment is usually carried out according to the following steps: first cut off the power supply. If the battery is charging, high heat, surface swelling, smoke, etc., it indicates that the battery will soon spontaneously ignite. An explosion may even occur, so the power supply should be cut off as soon as possible. When the battery ignites spontaneously, the battery should be continuously cooled down immediately. Fighting with water is the most ideal solution. If the fire is large, you can use ABC dry powder fire extinguisher or carbon dioxide type fire extinguisher to extinguish the open fire, and then continue to cool the damaged battery with water, and check the battery that has spontaneously ignited every 5 minutes. If it is still hot, continue to use water as the battery Cool down until the cooling is complete. Since lithium ion batteries are a kind of chemical combustion, if they are not continuously cooled, chemical reactions will continue to occur inside them, and the combustion will not stop. The burning of pure lithium-ion metal belongs to Class D fire. Water cannot be used as a fire extinguishing agent, and conventional fire extinguishing agents such as CO2, BC and ABC dry powder fire extinguishing agents cannot be used. However, in lithium-ion batteries, lithium ions exist in the form of oxides or salts, which are relatively inert to water, so it is safe to fight with water. If possible, move the damaged battery to an open safe area and quickly evacuate the surrounding people. This will reduce a possible fire hazard of personnel and property exposure. Electrolyte fumes and vapors are combustible heavier than air. In this way, they can move along the ground to another ignition source caused by a secondary fire. When conditions permit, quickly remove combustible materials around the battery that is spontaneously combusted. After spontaneous combustion of lithium-ion batteries, high-temperature electrolyte fumes and vapors appear, whose density is greater than that of air, so they can quickly spread to the periphery along the ground, ignite the surrounding combustibles, and cause a wider range of fires. Do not use ice cubes to cool lithium-ion batteries. Since the fire is caused by a chemical reaction, the exterior is covered with ice like an igloo, and the internal heat cannot be dissipated. The continuous high temperature further promotes the intensification of the chemical reaction. At this time, the internal temperature will rise rapidly, and the electrolyte A large amount of gas accumulates, and then causes the battery to explode. Its power and destructiveness are more terrifying than the peaceful spontaneous combustion of the battery. Even if there is an open flame, the use of foam fire extinguishers should be prevented. The sprayed foam adheres to the periphery of the battery to form a thermal insulator, thereby adding chemical reactions and generating more heat. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.