In recent years, new energy vehicles have ushered in a period of rapid development, and the market share of electric vehicles has also increased, and its safety has attracted more and more attention from consumers. Safety is always the absolute standard for buying a car. Today we will analyze the hot BYD e2. The core product of this E series can be recognized by the market and consumers, largely because of its excellent safety performance.
The safety situation of power battery is grim, and BYD dispels users' doubts.
Recently, spontaneous combustion accidents of new energy vehicles have occurred frequently, which has aroused great concern of the whole society about the safety of new energy vehicles. The fundamental reason is that this industry has been growing wildly for a long time. Many electric vehicles and fuel vehicles are produced on the platform, so it is difficult to design the three electric systems professionally. However, the safety of power battery has become a serious problem to be solved urgently.
15 battery is safe and accident-free, and "7 dimensions and 4 layers" is a solid guarantee.
In view of battery safety, BYD relies on the advantages of a complete industrial chain to provide an industry-leading "four-layer and seven-dimensional" battery safety protection system. With the support of e-platform, the reliability and safety of pure electric vehicle battery are pushed to a new height by exerting force on multiple safety dimensions of power battery.
First of all, in terms of battery safety, e2 not only realized a large proportion of hot-formed steel and high-strength steel on the car body, but also adopted high-strength aluminum alloy tray and honeycomb structure to strengthen the car frame, which not only reduced the weight of the car body but also improved the robustness. At the bottom of the battery pack, the battery pack tray adopts double-layer structure design, which can achieve better protection effect even if the automobile chassis is seriously bottomed. Under the condition of extrusion collision (extrusion strength ≥ 128)
First of all, in terms of battery safety, e2 not only realized a large proportion of hot-formed steel and high-strength steel on the car body, but also adopted high-strength aluminum alloy tray and honeycomb structure to strengthen the car frame, which not only reduced the weight of the car body but also improved the robustness. At the bottom of the battery pack, the battery pack tray adopts double-layer structure design, which can achieve better protection effect even if the automobile chassis is seriously bottomed. Under the condition of extrusion collision (extrusion strength ≥ 128)
Thermal runaway caused by battery overcharge is one of the main causes of battery fire in electric vehicles. In the aspect of preventing overcharge, BYD's battery protection can be divided into pre-overcharge protection and post-overcharge protection. The measures before overcharge mainly include accurate voltage detection and BMS classification protection, early monitoring and prevention of overcharge; Once overcharge occurs, the CID device will come into play. This mechanical device that pushes the flip part to open and close by pressure is one of BYD's cutting-edge patents. As a protective device, when the internal pressure of the battery increases due to overcharge, the reversing plate will be turned over by high voltage to disconnect the circuit, thus completely eliminating the danger caused by overcharge of the battery. In addition, BYD's battery pack also has an automatic fire extinguishing device to be foolproof and ensure the safety of the battery through various means.
After the hardware protection meets the requirements, BYD also has the original battery management system (BMS) for inspection. This system can protect the battery in different degrees, and there are different measures according to the charging voltage of the battery. Through current limiting protection and relay cut-off protection, the charging state will not be dangerous due to overcharge.
The last safety barrier is an early warning device for thermal runaway. The system will tell the driver that there is something wrong with the car battery at the first time, leaving enough time to escape. It is worth mentioning that in the "Safety Requirements for Lithium-ion Power Batteries for Electric Vehicles" issued last year, the requirements for thermal diffusion test items were also increased. It is generally believed in the industry that this is a great progress. Thermal diffusion or thermal runaway of lithium-ion batteries has been discussed in the industry for many years. The new national standard stipulates that when the battery pack is out of control, the car should provide an early warning signal and reserve 5 minutes to escape, while the new national standard requires 5 minutes. BYD's outstanding performance in controlling the thermal runaway and thermal diffusion of the battery allowed the vehicle to provide 65,438+00 minutes of disposal time after issuing a warning. The extra five minutes of gold can often kill danger in the cradle.
In addition, BYD also carried out strict tests on the battery under extreme working conditions such as overcharge, extrusion, fire and acupuncture with requirements and conditions higher than national standards. In addition, e2 (parameter | picture) also applies a variety of systems including intelligent temperature control system of power battery and intelligent charging reservation, which provides safety guarantee for the whole vehicle and ensures that customers can use the car without worry.
Higher than the industry test standard, giving users invisible protection.
In addition to power batteries, BYD also has an all-round testing system that far exceeds the national standards, covering comprehensive testing capabilities in testing fields such as vehicle, assembly and system testing, parts testing and material testing. And test the vehicle's power economy, waterproof sealing, wading and other performances. The three core components of battery pack, motor and electronic control all reach IP67 protection level to ensure the safety and reliability of the vehicle.
Take one of the durability tests of e2 as an example: the whole vehicle has passed the durability verification of 3 million kilometers, including various working conditions and roads such as mountain road, desert, plateau, yakeshi, etc., and has passed more than 400 vehicle performance tests and 100 intensified anti-corrosion cycles, and has passed extremely rigorous road tests all over the country. The strict standard is to ensure that every car is "rock-solid" and provide a strong guarantee for the safety of the whole life cycle of the vehicle.
Safety is always the bottom line, and more users' safe cars are the first choice.
Through years of rich data accumulation and industry-leading technical level, the new e2 has far surpassed its peers in security. Whether it is the seven-dimensional four-layer safety protection of power battery or the safety configuration of "armed to the teeth", e2 takes the safety of drivers and passengers into consideration, so that e2 can achieve quality safety and make consumers feel more at ease when using cars.