Jiayun New Material research and development of the world's first 1000 degree hi

New energy vehicles have been widely accepted by the public and are in the stage of rapid development. Meanwhile, the safety problems closely related to them are becoming increasingly prominent.

The types of lithium battery fires of new energy vehicles can be roughly divided into explosion during charging, explosion caused by driving collision, and natural explosion under static state.

various causes of explosion, battery failure or improper charging pile, can also lead to car explosion; In a severe collision, the battery pack is often deformed, resulting in the battery diaphragm torn and internal short circuit, flammable electrolyte leakage and explosion. Even if a fire is caused by a cause other than the battery, it is easy to cause a fire or explosion due to the thermal runaway of the battery.

According to relevant data, in the first half of 2022, there were a total of 89 spontaneous combustion incidents of new energy vehicles, including 44.9% spontaneous combustion in stationary parking state, 14.6% spontaneous combustion in charging state, 7.9% spontaneous combustion in driving and 4.5% spontaneous combustion after collision. Spontaneous combustion with no other state or data apparent accounted for 28.1%. According to the analysis of battery material type shown in the data, ternary lithium battery accounted for 37.1%, and lithium iron phosphate battery accounted for 62.9%.

In recent years, with the outbreak of the new energy vehicle market, aerogel has been applied to the field of power battery thermal protection, Aerogel can effectively block the thermal spread caused by the battery thermal runaway, build a solid battery safety "firewall", to ensure the safety of life and property . The aerogels insulation material is used to isolate the cell. When one cell is out of control, the aerogels material between the cells can effectively block the heat transfer to the adjacent cell, reduce the heat diffusion, so as to avoid the domino effect of the cell thermal out of control, effectively delay or prevent the cell out of control, and leave enough time for the driver and passenger to leave the accident site. Therefore, aerogel material slowly become the major power battery factory battery safety protection standard.

With solid experimental foundation and scientific research ability, Jiayun Xincai scientific research team has produced the world's first 1000-degree resistance aerogel insulation sheet.

According to the temperature changes on both sides of the aerogel (out of control and not out of control) in the experiment:

(1) 63Ah, 100% charging soft pack 811 cell, in the first cell thermal control, the highest temperature of the explosion cell reaches 1300℃ for 10 seconds, high temperature 600-1300-600 ℃ for 140 seconds. (2) The highest temperature in the center of the unexploded cell reached 270℃ and then decreased gradually by using an aerogel insulation sheet between 2.0mm cells. The maximum temperature of the unexploded core reached 172℃ after being insulated by the 2.5mm aergel insulation sheet between the cells, and then gradually decreased. (3) No thermal runaway occurred in the cells insulated with 2.0mm and 2.5mm Anka intercell aerogel insulation products, and the appearance was intact and the voltage was stable at 4.16V.

At present, this product has passed the internal audit system of a famous battery company in October 2021 and been included into the access material suppliers. The highest temperature of this product in the application scenario can reach 1,300℃, which is the only oxide aerogel product in the world that can meet this standard.