Breaking through the safety issues of high specific energy batteries

　　When it comes to pure electric vehicles, everyone’s first impression is of Tesla, which has excellent technology and safe products. Indeed, typical pure electric vehicles represented by Tesla have achieved breakthroughs in safety, maintain a leading edge in the market, and are rated as the "most popular car brand" in the United States. However, due to its high price, it has become a luxury item that is out of reach for the general public. This is also one of the important reasons for the rapid development of the domestic new energy vehicle industry.

　　Although domestic new energy vehicles are developing rapidly, especially in 2017, new energy vehicles have experienced explosive growth and sales have increased significantly. However, by comparison, you will find that the cruising range of domestic pure electric vehicles is not particularly high, basically maintaining around 200. ,Why? Is it because the manufacturer does not understand the needs of users? of course not. This is mainly because with the continuous use of high-specific energy cells, the biggest concern of new energy vehicles is that there has been no substantial breakthrough in the safety of battery packs. The larger the battery pack, the more cells are used. Once a single The battery cell failed, resulting in the explosion and fire of the entire battery pack, which has never been solved.

　　From 2009 to 2012, Jianghuai Automobile broke through the safety of lithium iron phosphate batteries and developed lithium iron phosphate batteries with an energy density of 120-160Wh/kg. Even if a battery cell thermally runs out of control, it will not cause a fire or explosion in the battery pack, but the battery life of electric vehicles will be reduced. None are particularly high, basically staying around 200km.

　　From 2013 to 2017, JAC Motors focused on the safety of high-specific-energy ternary batteries, which are difficult industrial problems. The goal is to overcome the safety development of a single cell explosion with an energy density of 200-240Wh/kg without causing fire or explosion in the battery pack, that is, thermal runaway. After thousands of painful failures, it finally achieved a breakthrough, which also marked a solid step for JAC Motors on the road to high endurance.

　　The so-called thermal runaway safety technology refers to the fact that the explosion of a single battery cell will not cause fire or explosion in the battery pack. JAC Motors has summed up a five-level thermal runaway safety development process method in the face of constant challenges. The first level is a single battery cell, the second level is a thermal runaway safety technology. Simple modules at the third level, multi-string modules at the third level, battery packs at the fourth level, and complete vehicles at the fifth level are forced to trigger thermal runaway of the single unit. For the 18650 single unit of 225Wh/kg, the method is more stringent than the actual thermal runaway. 80W power external heating method. A unique two-way exhaust structure is developed to achieve single body thermal runaway directional explosion. It has achieved "electrical isolation and thermal isolation". After more than 1,000 repeated tests, it has been completely achieved that after a single battery cell is forced to trigger thermal runaway, the battery module will not catch fire or explode. After countless repeated tests, it has been completely achieved that after a single cell is forced to trigger thermal runaway, the battery pack will not catch fire or explode. Its unique single cell thermal instability diagnosis technology can also detect single cell failure in time. In terms of the development of thermal runaway for the entire vehicle, a heating method that is more stringent than the actual thermal runaway is used. Each vehicle is forced to trigger 10 individual thermal runaways. The entire vehicle does not catch fire or explode, and the vehicle can still drive normally.

　　JAC iEV7S is the first product to apply this technology. The release of iEV7S also marks that after more than 4 years of research and thousands of explosion tests, JAC Motors has finally achieved a breakthrough in thermal runaway safety technology for electric vehicles. The media and competitors have always questioned whether JAC can't make a high-endurance pure electric vehicle. It's not that it can't make it. Once it blindly launches a high-endurance electric vehicle, it will be irresponsible to consumers. Now, the release of JAC iEV7S has a constant-speed range of over 350km and a working condition of 280km, completely dispelling doubts. At the end of the year, iEV7T with a range of more than 400km will also be unveiled, and products with a range of more than 500km are also being prepared.

Read recommendations:

Colorful T style strap

Introduce the maintenance of lithium-ion batteries in electric vehicles.18650 battery rechargeable

6F22 carbon battery.Operation process of iron lithium batteries

18650 3.7v battery

CR1620 battery