Tungsten oxide may prevent Tesla batteries from spontaneously igniting

       Shanghai April 21 at 20:32, Shanghai xuhui district tede huayuan residential area underground garage, white Tesla suddenly spontaneous combustion, resulting in the next audi and lexus together burning up, fortunately no casualties. On April 24, experts from all sides evaluated the accident vehicle at Tesla Shanghai experience center, and preliminarily confirmed that it was a short circuit of 18650 lithium battery.

Tao wei, an expert from the Tesla experience center in Shanghai, said that after testing the burned Tesla, it was preliminarily determined that the battery was short-circuited, but now that the battery and chip of the car have been burned off, there is no way to find the record. It is not clear when the results will be available.

The owner, dong, pointed out that nothing had been knocked against the chassis of the car so far, so the debris and parts of the damaged car have been collected and two other burn-out cars have been dragged out of the basement.

Lithium battery has active chemical properties, small size, high capacity density and low physical and chemical stability. Metals in batteries are prone to violent oxidation reactions with oxygen in the air, releasing a lot of heat energy, and so have always been at risk of spontaneous combustion. The self-igniting Tesla chassis is equipped with 7,104 18,650 lithium batteries, which is the biggest danger of the car.

At present, the most widely used lithium batteries on the market are lithium iron phosphate batteries and ternary batteries. Byd electric car more lithium iron phosphate battery, better security, long life, environmental protection, but the battery also has many shortcomings, small energy, large size, short range. Tesla, on the other hand, USES the riskier ternary battery.

Ternary battery has high energy density, stability and consistency, which brings Tesla far superior battery life and speed experience to its peers. In order to ensure safety while maintaining high speed and efficiency, Tesla chose panasonic 18650 battery with relatively good safety performance.

Although the Tesla 18650 lithium battery pack is equipped with perfect thermal management system and battery management system, and USES plastic film to protect the battery pack to avoid contact with air, it cannot prevent short circuit inside the battery. The short circuit of the battery is caused by direct contact between the positive and negative poles or poor wiring. In response, battery experts say the cathode material should be made of tungsten oxide, a rare metal with a large surface effect and porosity, to prevent dendrites from forming and puncturing the membrane.



Tungsten trioxide



Tungsten oxide is a rare metal compound, hypoxic structure, n-type semiconductor, good mechanical properties, not easy to break, good ductility. What is more important is, oxidation tungsten has intense cut off action to ultraviolet ray and near infrared ray, besides can prevent effectively without outside polar material ageing, also can make sure material maintains at a normal temperature at the same time. In general, tungsten oxide could be made into a highly safe electrode material that could prevent Tesla batteries from spontaneously igniting.