Lithium titanate drives change in car batteries -Lithium - Ion Battery Equipment

Lithium titanate drives change in car batteries -Lithium - Ion Battery Equipment

In the early morning of June 23, hundreds of electric vehicles burned in a parking shed in a residential area in Chengdu, Sichuan, forming a huge fire scene. In just half an hour, only a pile of iron shelves and ashes were left in the carport, and the outer wall of the building closest to the carport was blackened by smoke. It is understood that a large number of electric bicycles were charged in the carport at that time, and one of them suddenly caught fire and caused the accident.

Since the beginning of summer, the overall number of electric bicycle fires has been on the rise. In June, a fire broke out in an electric bicycle shed in Jiangxi, and 14 vehicles were burned at the scene; in May, electric vehicles in a community in Henan exploded while charging at home, and residents' homes were burned in a mess ; Less than a minute after an electric car entered the elevator in Chengdu, thick smoke burst into flames, causing many injuries, and related topics quickly entered the hot search, causing heated discussions.(Lithium - Ion Battery Equipment)

At present, electric bicycles have become an important means of transportation in people's daily life, but they bring convenience and safety hazards at the same time. Experts said that the main causes of electric vehicle fires include spontaneous combustion caused by battery failure, and fires mostly occur during the charging process. The safety of electric bicycles, especially the hidden danger of fire during the charging process, has become the focus of the industry and the whole society.

At present, there are two main types of batteries for electric vehicles: lead-acid batteries and lithium-ion batteries. In the twenty years of the development of two- and three-wheeled electric vehicles, lead-acid batteries occupy an important position, but their shortcomings are gradually exposed. Due to the limitation of materials, lead-acid batteries are prone to spontaneous combustion when encountering excessive current or voltage, short circuit, and excessive temperature rise during use. In terms of time, there is no doubt that the probability of accident risk in the charging process has been greatly increased.

According to CCTV, the number of electric two- and three-wheeled bicycles in my country has exceeded 300 million, and it is still increasing at an annual rate of 30%. In the civilian product market, safety is always the most important factor for users to consider. To ensure the safety of electric vehicles, it is not only necessary to increase the construction of industry standards and regulations, but also to choose a suitable battery technology route from the source is an effective way to prevent accidents.

"The safety of lithium-ion batteries ultimately depends on whether the battery can prevent thermal runaway." Ai Xinping, a professor at Wuhan University, pointed out. The data shows that, as one of the technical routes of lithium-ion batteries, lithium titanate materials do not form SEI films with poor stability. Compared with traditional lithium-ion graphite anode materials, it can prevent the loss of control caused by the decomposition and regeneration of SEI films under extreme conditions. , greatly reducing the hidden danger of battery fire and explosion. At the same time, the lithium titanate material has a higher potential to lithium metal, which prevents the formation of lithium dendrites during the overcharge process of the battery, and has better safety and stability.

Can this high-safety lithium-ion battery be applied to the two- or three-wheeled electric vehicle market? In fact, a variety of lithium titanate power lithium batteries have been launched on the market, covering the market of two-three-wheeled vehicles and quick power exchange cabinets. Tests show that compared with lead-acid batteries that are fully charged in 8 hours and replaced every 1-2 years, Yinlong's lithium titanate power lithium batteries can achieve fast charging in half an hour and have a cycle life of more than 10 years. Maintenance-free, light weight, easy disassembly and other comprehensive performance advantages.

In 2019, the new national standard of "Technical Specifications for Electric Bicycle Safety" was officially implemented, which put forward higher requirements for the safety performance of power lithium batteries. A video about the safety test of lithium titanate battery shows: a 5-8 mm steel needle with a smooth surface and no rust quickly pierces a light blue lithium titanate battery in an electrified state. The battery did not leak or explode, and even if the steel needle stayed in the battery for 1 minute, no fire and explosion were found.



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