Analysis on Fire Protection Strategy of Lithium Battery

Lithium battery fire protection strategy Lithium batteries are generally divided into lithium metal batteries and lithium batteries. Lithium batteries are widely used because of their rechargeability and high energy density. The safety of lithium batteries is a bottleneck for the development of lithium batteries and related industries (such as new energy vehicles). The electrolyte lithium battery inside is a flammable liquid, the electrode is a flammable material, the lithium battery is overcharged, short-circuited, overheated, punctured or knocked and other conditions are thermally out of control, short-term fire or even explosion, mobile phones, battery electric bicycles Or when electric cars happen because of fire cases. With 20 years of relevant experience in the fire protection industry, he has extensively communicated with colleagues at home and abroad. Since 2012, he has been studying the fire protection of lithium batteries for electric bicycles and electric vehicles. Introduction to lithium battery fire protection strategy Lithium battery fire protection must establish strategic depth and multiple lines of defense. In addition to using the non-combustible or non-combustible materials in the battery, the battery has a substantial safety function as much as possible. The first line of defense outside the battery is to prevent the occurrence of various reasons that cause the battery to overheat and fire, such as overload, short circuit, collision, etc. Safety design of electrical system. When the first line of defense is broken (for example, the battery management system fails to cut off the charging power supply in time), the battery temperature rises, the temperature sensor or the gas or smoke detector monitoring system should find the defect and alarm in time, and prompt the staff to deal with the defect and eliminate it. The cause of the fire. This is the second line of defense. When these defects are not dealt with in time and the second line of defense is destroyed, battery burning (smoldering) cannot be prevented. What the fire control system has to do at this time is to limit the combustion to the defective battery box (or box), thereby isolating adjacent unfired batteries and equipment to prevent fire isolation. Since the temperature of the lithium battery is very high after the temperature is controlled, the existing non-aqueous resuscitators such as gas and dry powder will not be able to reduce the temperature sensitivity of the battery, and the purpose of resuscitation is not very ambitious. Therefore, setting the battery fire strategy to controllable burn-out is a realistic method with strong technical and economic benefits. This is the third line of defense. When the fire control fails and the fire spreads and poses a serious threat to the safety of the personnel industry, the fixed water-based rescue system must be in the car or waiting for the rescue of the fire brigade. Generally speaking, battery manufacturers or electric vehicle manufacturers will consider the first and second lines of defense. As a fire professional, we can establish a strong third line of defense for our customers. We can customize the method according to the specific model and standard function of the battery. The components used in this approach come from all over the world and are not limited to one type of equipment or material. Examples of Lithium Battery Fire Prevention Measures This approach is simple and easy to learn from the advanced relevant experience of foreign countries. The important parts of fire are mineral particles, non-combustible, non-conductive, non-corrosive, safe and environmentally friendly, very light weight, reliable function and reasonable cost, and can be widely used in lithium battery fire rescue during processing, storage, transportation and use. The following video is the test process of lithium battery fire protection method. After the lithium battery burns due to heating or overcharging, under the maintenance of fireproof particles, there will be no flames, no blasting, and only white smoke, thus preventing the fire caused by the burning of the lithium battery. Anti-resuscitation principle: Oxygen isolation, suffocation recovery, heat absorption and cooling. Particle size: 1-4mm. Particle density: 360kg/m3. Cover the battery with fire-resistant particles. Only smoke will appear after the battery is heated. An independent life-saving tube can also be installed in the battery box (or box). After the battery catches fire, the rescue tube is heated and ruptured, and rescue gas is actively released to extinguish the battery fire. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Analysis of tension control system of lithium battery winding machine