TU-TESL

• 22

With the rapid development of new energy vehicles in China, there are more and more "green brands" around us. People's attention has shifted from simple performance and endurance to intelligence, energy supplement and safety. What we are talking about today is the power battery safety problem with the highest attention and the most skeptical voice of consumers in the near future. Just a few days ago, the battery puncture experiment of a well-known main engine factory in China caused a heated discussion. The lithium iron phosphate battery and the blade battery independently developed by them conducted the same puncture experiment. The huge reaction between the three-way lithium battery and the lithium iron phosphate battery made people feel cool after thinking about the various spontaneous combustion events of electric vehicles before. It can be seen from the experiment that the blade battery has better security in the face of puncture damage, but because it is a new product, other aspects of performance have to pass the market test. The power battery of new energy vehicles will undergo a series of rigorous tests before leaving the factory. In the "test code for lithium ion power battery system of electric vehicles", there are 16 safety tests including vibration, extrusion, temperature shock, water immersion, etc. In fact, in our daily use, the phenomenon of puncture impact is not common, but there are many cases of vehicles wading and soaking in water. Recently, GAC motor has organized a battery safety experiment activity in a 4S store in Guangzhou. The main role is the power battery on the second generation GAC motor GS4 PHEV. The project is immersion experiment, which aims to show whether the ternary lithium battery, which is known as IP67 protection grade, is safe after a long time immersion and can be used normally afterwards. First of all, this power battery was just removed from a GS4 PHEV commercial vehicle of GAC motor. The battery is located in the middle of the vehicle bottom and fixed with more than 40 bolts. After dismantling, lift it with a crane and slowly put it into the water with a depth of more than 1 m. According to the "IP67 safety test standard", the battery can be immersed in 1 meter deep water for 30 minutes, and the test time is 40 minutes. During this period of time, the battery did not change, and the goldfish in the water did not have any other reaction, which directly shows that its immersion safety can easily reach the standard. In addition to the simple immersion test, this test also needs to reinstall this soaked battery back to the GS4 PHEV. Under the witness of the whole audience, the battery was hoisted again by the crane. After the maintenance personnel cleaned the water stains on the surface and interface, it was installed on the vehicle as it is. After the maintenance personnel reset and checked it, it didn't come out of everyone's expectation. After 40 minutes of water immersion test, the GAC motor GS4 PHEV was successfully started again. What's the origin of this battery? The ternary lithium battery of the second generation GAC trumpchi GS4 PHEV comes from Ningde era. It has mature technology and high reliability. Its battery capacity is 13kwh and energy density is 165wh / kg. Compared with the first generation, the pure electric range of the second generation GS4 PHEV has increased from 58km to more than 61km. The third generation intelligent temperature control system of GAC is used in the temperature control system, which has fast cooling mode and heating mode, and always controls the battery at the best working temperature. The battery module and shell are made of 6 series high strength aluminum alloy, which not only ensures the strength of the battery pack, but also reduces the weight. GAC motor GS4 PHEV, the second generation of GAC motor GS4, is based on GAC global platform modular architecture (GPMA), and has a comprehensive plan for new energy products at the beginning of development. Under the new platform, the products have outstanding beauty value, and the interior also has a super experience. The overall appearance of the second generation GS4's PHEV version is the same as that of the ordinary version. There are two blue lines running through the middle net of the front of the car to show their identity. The center console in the car is the same as the normal version, but the buttons of EV mode, charging mode and power holding mode are added in the area behind the shift lever. IP67 protection level popular science IP67 standard refers to protection safety level. IP is the abbreviation of ingress protection rating (or international protection code), which defines the protection capability of an interface for liquid and solid particles. IP is followed by two numbers. The first is solid-state protection level, with the range of 0-6, indicating the protection from large particles and foreign matters to dust; the second is liquid protection level, with the range of 0-8, indicating the protection from vertical water drop to underwater pressure. The larger the number, the stronger the representation. IP67 is interpreted as protection against dust inhalation (overall protection against contact, protection against dust penetration); protection against brief immersion (protection against immersion). The highest level in the cabling industry is IP68. In addition, the industrial connector also has the consideration of temperature, anti-seismic and other adverse environment factors.