As temperatures continue to rise in recent days, many car owners are paying more and more attention to driving safety issues. For traditional fuel vehicles, many friends' cars will be equipped with an on-board fire extinguisher. So, do the purely electric vehicles currently being developed also need to be equipped with fire extinguishing devices? Wenqing believes that nature is necessary.
Although from a current policy perspective there is no mandatory requirement for family cars to be equipped with on-board fire extinguishing devices, it is nevertheless necessary to prevent problems before 'they don't arise. According to the "2019 Electric Battery Safety Research Report" released by Feng Xuning, Director of Battery Safety Laboratory of Tsinghua University in August 2019, since the beginning of 2019,Spontaneous combustion accidents of electric vehicles have occurred frequently. In August, according to incomplete statistics, there had been more than 40 cases. After a vehicle catches fire, if the vehicle body is equipped with a fire extinguishing device, losses can be avoided as much as possible.
It should also be noted that pure electric vehicles are different from traditional fuel vehicles in that they are equipped with a power battery combined with an electric motor to drive the vehicle, and the battery power itself is an energy storage device. Judging from the batteries currently installed in pure electric vehicles, most of them are ternary lithium batteries and some are lithium iron phosphate batteries, and these two batteries are liquid lithium ion batteries. If this type of battery becomes deformed, it is subject to thermal runaway.ic and presents a high risk factor.
In addition, there are a large number of electrical components and circuits inside the car. After a long period of use of a car, the affected wiring will appear to age. In hot weather, a short circuit can easily occur, causing the vehicle to spontaneously ignite. At this time, if the body is equipped with a fire extinguishing device, emergency treatment can be carried out. It can even eliminate hidden dangers at their source, preventing greater losses. It is not difficult to understand that it is always necessary for electric vehicles to be equipped with fire extinguishing devices. I wonder what everyone is thinking?
This article is from the author of Autohome Chejiahao and does not represent the views and positions of Autohome.
What about lithium iron phosphate batteries?
Lithi batteriesum iron phosphate will not explode or catch fire. Chemically speaking, lithium iron phosphate batteries are indeed much safer. This is mainly due to the stability of the PO bond in the lithium iron phosphate battery crystal, which does not decompose to form oxides even in high temperature environments, so it is difficult to meet the explosion conditions and fire. Only when the battery temperature reaches 800 degrees Celsius will the chemical components inside the battery begin to decompose. Ternary lithium batteries begin to decompose after 200 hours. Lithium iron phosphate battery is a lithium ion battery that uses lithium iron phosphate (LiFePO4) as the positive electrode material and carbon as the negative electrode material. The nominal cell voltage is 3.2 V and the charge cut-off voltage is 3.6. V~3.65 V.
Lithium phosphate battery, also known as lithium ion battery, is a very popular rechargeable battery. It is composed of an ion exchange membrane and an electrode container. light weight, high temperature resistance and impact resistance, safe and reliable, long service life and other advantages. However, lithium phosphate batteries also have some disadvantages, such as low capacity and low price. Problems such as relatively high price and high self-discharge rate.
1. Advantages of lithium phosphate batteries
First of all, lithium phosphate batteries are small in size and light in weight, which can meet the portability needs of modern people and are more convenient for daily use. Second, lithium phosphate batteries have greater resistance to high temperatures and can generally withstand temperature changes ofe -20°C to 60°C. They are more durable and can function normally in harsh environments. In addition, lithium phosphate batteries are safer and adopt "quadruple protection" technology, which can effectively prevent overcharging, overdischarging, etc. and avoid accidents. Finally, lithium phosphate batteries have a long lifespan, which can generally reach more than 1,000 times, and the price is relatively affordable.
2. Disadvantages of lithium phosphate batteries
First of all, the capacity of lithium phosphate batteries is relatively small, generally only 2 ~ 5 Ah, which cannot meet users' needs for large ability. capacity batteries. Secondly, the price of lithium phosphate batteries is relatively high, and many users are not willing to spend a lot of money to purchase them. In addition, the price is relatively fragileand is strongly affected by changes in market prices. In addition, lithium phosphate batteries have a high self-discharge rate, and irregular charging can affect the performance of electrical devices.
3. Application of lithium phosphate batteries
Lithium phosphate batteries are widely used in electric vehicles, motorcycles, smartphones, laptops, mobile power supplies, etc. part of modern life. Because lithium phosphate batteries are of good quality, safe and reliable, they are becoming more and more popular with users and attracting more and more attention from more industries.
4. Charging lithium phosphate batteries
There are also certain regulations for charging lithium phosphate batteries. Second, you should choose a suitable charger to ensure the safety of battery charging. duringcharging, during the process, it is necessary to monitor the battery charging data in time and stop charging in time to avoid overcharging or overdischarging. Finally, charging beyond the rated capacity of the battery is prohibited to avoid electrolyte. loss and affect battery life.
5. Maintenance of lithium phosphate batteries
There are also certain regulations for the maintenance of lithium phosphate batteries. First, make sure the battery temperature is within the normal range and. Secondly, protect the battery from shock, and finally, check the battery's charging and discharging status frequently to avoid overcharging and overdischarging, which will affect battery life.