Lithium battery pack explosion-proof technical knowledge, how to prevent battery explosion? New energy vehicles using lithium battery packs as energy storage devices have now become the mainstream of the market. However, with the promotion and application of new energy vehicles, the problem of spontaneous combustion of lithium batteries and the safety of vehicle use have become issues of concern to everyone. Usually we will design an explosion-proof valve on the battery shell to prevent the lithium battery pack from exploding in thermal runaway. Lithium battery pack explosion-proof technology: Explosion-proof battery is a new type of battery product, which is made of high safety factor materials and is a safe battery that can effectively prevent battery explosion. The safety feature of explosion-proof lithium battery pack is its biggest feature. In order to ensure the safety of lithium-ion batteries, we usually design an explosion-proof valve on the battery shell, which can be destroyed in time when the pressure is too high, releasing the pressure inside the battery and preventing the lithium battery pack from exploding in thermal runaway. Lithium battery packs have become the preferred battery for portable electronic products. This kind of battery has high capacity density and competitive price, and is expected to remain the mainstream of the market in the next few years. But lithium batteries have always lurked the risk of explosion. As their applications become more and more widespread, explosion incidents occur one after another. In fact, through correct lithium battery pack system design and cell grade determination, lithium-ion batteries can be very safe. At present, explosion-proof circuit and explosion-proof battery cell technologies are mature, and explosion incidents should become less and less. The types of lithium battery core explosions can be summarized as external short circuit, internal short circuit, and overcharge. Based on the above types of explosions, we can focus on explosion prevention in three aspects: preventing overcharging, preventing external short circuits, and improving battery cell safety. Among them, overcharge prevention and external short circuit prevention belong to electronic protection, which are closely related to the lithium battery pack system design and battery assembly. The focus of improving battery cell safety is chemical and mechanical protection, which has a greater relationship with battery cell manufacturers. Fire-proof and explosion-proof lithium batteries were developed in Japan. Japanese researchers have recently developed a safer lithium-ion battery electrolyte that is less likely to burn or explode even in high-temperature and other environments. Now, Japanese scientists have developed what is known as the safest lithium battery pack in history. It will not explode and is not easy to burn or explode even in high temperature and other environments. It is quite safe. It is reported that scientists have developed a high-concentration electrolyte containing the flame retardant trimethyl phosphate. In addition to not being easy to burn, this electrolyte can achieve highly stable charge and discharge for more than 1,000 times or more than one year, and its service life is comparable to Even more than traditional lithium-ion batteries. In addition to mobile phones, car batteries can also be used with confidence. How to prevent explosion of lithium battery electric vehicles? The potential problems of lithium batteries are reflected in three aspects: high production cost, high temperature and easy explosion, and convenience of charging and use. Therefore, the application of lithium batteries in the field of electric vehicles must focus on solving these technical problems. Therefore, the application of high-energy-density battery materials, solid-state non-combustible battery technology and research on lithium-air battery technology have become the direction of electric vehicle battery technology change. First, through research on all-solid-state lithium battery technology, non-combustible battery technology, and battery protection device technology, the problem of high temperature and explosiveness of lithium batteries is solved; secondly, through the development and application of high-energy-density battery materials, the cost of battery production is reduced, such as silicon , graphite, graphene-based, graphene, composite metal lithium electrodes, cobalt-free high voltage, aluminum-graphite dual-ion batteries, etc.; Finally, through the research of lithium-air batteries and lithium-oxygen batteries, the problem of lithium battery charging convenience is solved. In response to the explosion-proof problem of automobile lithium batteries, the R&D engineers of Puwei Company have developed and designed a PBA explosion-proof valve after many tests. It is an explosion-proof, waterproof and breathable product designed for automobile battery packs, battery boxes, etc., and has successfully solved the problem of automobile batteries. Explosion problem. It has been widely used in batteries for pure electric vehicles, hybrid vehicles, new energy hybrid vehicles, hybrid vehicles, etc., promoting the rapid development of automotive batteries. PBA explosion-proof valve introduction: PBA explosion-proof valve (also known as Puwei explosion-proof valve), the shell is made of metal, and uses mechanics to perfectly combine with Puwei microporous membrane to achieve explosion-proof, waterproof, breathable, pressure balancing and other functions. Provide higher protection and safety performance for car batteries. Features of PBA explosion-proof valve: 1. It can quickly balance the pressure difference while meeting the IP67 protection level. 2. When the burst pressure value is reached, it is directly connected to the outside. 3. When the cavity pressure is less than the burst pressure value, it can continue to be reused. 4. Metal shell, strong corrosion resistance and long service life. Three dangerous consequences of lithium battery short circuit 1. Leakage: When the temperature inside the lithium battery rises slowly, the outer casing gradually melts and the protective layer fails to protect, resulting in the leakage of corrosive electrolyte. 2. Explosion: The temperature inside the lithium battery rises rapidly. Since the outer shell does not gradually melt when the temperature rises slowly, the internal space of the battery is insufficient to accommodate the expanding gas under heating, and the battery container explodes due to excessive pressure. 3. Spontaneous combustion: The sparks generated by the short circuit will ignite the electrolyte in an instant. This is because the electrolyte is composed of flammable liquid. The burning electrolyte will ignite the plastic body and cause the battery to burn. If there are flammable materials around the battery, Will cause fire. Although reports of spontaneous combustion and explosion of lithium battery packs are common, in terms of proportion, they are actually negligible. This is because lithium battery manufacturers have considered these safety hazards and tried their best to avoid this situation at several levels. occur.

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