Lithium batteries have great energy and temper, and are prone to smoke, fire and explosion, but they can be obedient if they are properly managed. For example, Toyota imported electric vehicles from 1997. Up to now, in the past 23 years, more than150,000 Toyota cars equipped with power batteries have galloped around the world, but there has never been a safety accident caused by power battery failure.
This shows that safety and reliability and electric vehicles are not exclusive, and Toyota's electric vehicles have put a lot of thought into safety. In 2020, Toyota pure electric vehicle products will officially enter China, and Yidong E, the first pure electric SUV of FAW Toyota, is one of them.
Safety of electric vehicle: protect the battery and the body should be strong enough.
In addition to the details of the front, the E-Engine seems to be not much different from the fuel version, because they are all their own sister models, enjoying the Toyota TNGA architecture and adopting different power schemes.
Correspondingly, Yize E engine also enjoys the safety body structure of Yize fuel version. High-strength steel and ultra-high-strength steel are widely used in its body-in-white, and 1500Mpa hot-formed steel is used in key stress parts such as A-pillar, B-pillar and longitudinal beam, forming a solid safety cage structure to protect occupants and battery packs from collision.
Previously, Yize Fuel Edition achieved excellent results in the crash test of China Insurance Research Institute. Even the most demanding 25% coverage frontal impact is safe and worry-free, which proves that its body structure has withstood the test. However, the body-in-white of Yize E engine uses more steel, which can bring better protection to the battery pack in the event of collision, and the impact resistance of the frame is only stronger than that of the fuel version.
The most unique part of the body-in-white of Yize E engine is the integrated structure of battery pack and chassis. On the one hand, the reinforced battery pack is integrated with the body chassis, so that the body safety cage structure can better protect the battery pack, share more impact force during collision, and reduce the risk of battery being impacted by external force; On the other hand, the reinforced structure of the battery pack can also be used to improve the chassis rigidity, that is, to improve the safety and optimize the driving quality and handling performance of the car.
In addition to the integrated structure of battery pack and chassis, the chassis rigidity of Yize E engine has also been greatly strengthened. The body of Yize E engine has many reinforcement structures, such as the top connection structure of the front suspension (ejector rod), the lateral reinforcement structure on the chassis, and the newly added power system bracket in the engine compartment. Under the joint action of various reinforcement structures, the torsional stiffness of the white body of Yize E engine is 20% higher than that of the fuel vehicle, and the center of gravity is reduced by 65,438+04%.
In particular, due to the integrated structure of the battery pack and the chassis, the battery pack does not significantly raise the floor of the carriage to occupy the passenger space. The rear seat of Yize E engine has a reasonable hip position and sitting posture except that the cushion is slightly thicker than the gasoline version.
1.8m The experience of sitting in the back row is as shown above: the cushion completely supports the thighs, the sitting position is relaxed enough, and the head space is sufficient, which is not the same as the strange sitting position of the low-tech "oil to electricity" car.
On the other hand, the integrated structure of the battery pack and the chassis also makes the battery pack not too close to the road. Although the ground clearance is not as good as the fuel version, it is still a reasonable height, which makes this electric SUV still have certain passability and wading ability.
Yize e jinqing's battery pack adopts the highest sealing technology, and the bottom sealing is painted twice as much as the conventional method. Its wading performance meets the most stringent Shanghai vehicle wading test standard in China, and it can meet the safety wading depth of 500mm, which is 100mm more than the domestic Tesla Model 3.
The bottom plate of the battery pack adopts box beam structure and well-shaped reinforcement, and adopts bolt+bone structure to wrap double insurance, which is not only thicker than the traditional bottom plate of the battery pack, but also the crisscross box beam structure further enhances the structural strength and has sufficient anti-collision performance, and protects the battery pack from being damaged when it encounters bottom support or bumps and rubs by the road surface.
It can be seen that even if they are all based on TNGA architecture, the simultaneous development of Yize E engine and fuel version has considered the solutions corresponding to different power types from the beginning. Its spatial structure and layout are reasonable, and the passenger compartment and battery pack are also safe enough. To some extent, its chassis is specially designed for electrification, which is completely different from the electric vehicle that is hard modified from a fuel vehicle.
Reliability of electric vehicles: In addition to being strong and crash-resistant, the battery safety system should be excellent enough.
The high-strength battery pack with body and box beam structure solves the safety hidden trouble of electric vehicles after collision, but the battery may fail without collision, so a safe and worry-free electric vehicle also needs excellent battery operation control and safety monitoring system.
Yize e engine uses Panasonic batteries of the same origin as Tesla, but it replaces Tesla's 4 or 5 18650 cylindrical batteries with 288 square batteries. The advantage of reducing the number of batteries is to reduce the probability of battery failure, and the shape of square batteries is also very beneficial to the spatial layout of battery packs.
Square battery cells are horizontally arranged in the battery pack to form a battery module, and a gap is left between every two battery cells, so that cold air takes away heat when passing through the surface of the battery cells to control the battery temperature; In addition, when the battery is impacted from the side, the gap between the batteries provides additional buffer, which can reduce the damage of the battery.
The layout of the battery pack is the idea of absorbing energy layer by layer and protecting the core components. The high-voltage cable with the highest safety requirements is arranged in the middle, with battery modules on both sides, the air duct of the battery coolant cooling system on the outermost side, and then the battery pack shell.
In case of collision, the side beam of the frame, the box beam structure of the battery pack shell and the air duct inside the battery pack are all used as energy-absorbing structures, which relieve the impact force layer by layer from the outside to the inside, and the multi-layer energy-absorbing structure wraps the power battery and the high-voltage cable in the middle, which is safer.
Temperature control is closely related to battery safety and battery life. A considerable number of battery spontaneous combustion and explosion accidents are caused by the failure of battery thermal management. The battery temperature control of Yize E engine adopts refrigerant cooling and electric heater to ensure that the battery pack can be adjusted to normal temperature in time in extremely hot or cold environment, which is conducive to prolonging the battery life and avoiding the risk of battery fire and combustion under extreme conditions.
The refrigerant cooling system is equivalent to packaging "air conditioning" for the battery of Yize E engine. Air-conditioning compressor is used to deliver cold air to the carriage and battery pack at the same time, which can quickly cool the power battery in hot environment and solve the problem of heating when the battery is discharged or charged at high power.
Compared with liquid-cooled batteries, the refrigerant cooling system is simple in structure and lighter in weight, and there is no need to worry about the risk of battery short circuit caused by coolant leakage, so it has more efficient cooling performance than traditional air-cooled batteries. In the stability test of battery temperature control, Yize E engine continuously carries out high-load cycle test of high-speed driving/fast charging, and the battery panel temperature is always kept in an ideal state. As for the low load condition of daily use, there is no need to worry about the thermal management of the battery.
Yize e engine adopts the most stringent triple safety monitoring system of single battery-battery module-power battery pack in the industry. Even if the battery in a certain area fails, it will be found and controlled in the initial stage. Unlike most electric vehicles in China, which only choose dual safety monitoring of battery cells and battery packs, Yize E is actually very careful in these places that are invisible to the naked eye and the configuration table is not written.
Advanced battery thermal management technology and safety monitoring without dead ends can not only minimize the risk of battery failure, but also keep the battery in the best working environment and prolong its life. The test results show that the performance of the power battery of Yize E engine is stable at high and low temperatures, and the battery life and long-term durability are also guaranteed. After 10 years of use, the power battery still retains no less than 80% of the available power.
The core value of a car is always safety, and electric cars are no exception.
At first glance, the book indicators of Yize E engine are not "brilliant", such as its acceleration of 7.6 seconds in zero hundred seconds, NEDC battery life of 400km, man-machine interaction Baidu Carlife…… .....................................................................................................................
But as a car, I prefer it to help me brake hard in an emergency, rather than teasing me with a small robot on the dashboard and distracting me. After all, the latter can be solved by spending thousands of dollars on an Apple phone.
Toyota cars have never made a fuss about gimmicks. Its advantage is the patented technology accumulated in the field of electrification for many years, from physical safety to technical safety, bringing customers a comprehensive and safe car experience with mature and perfect solutions.
There is no intelligent robot in the control panel, even Apple Carplay does not support it, but it has the highest active/passive safety configuration in the same class, including 10 airbags all over the vehicle and a new generation TSS II Toyota Zhixing safety system, including PCS pre-collision system, LTA lane tracking auxiliary system (with low-speed car following function), AHB automatic high beam system and DRCC dynamic radar cruise control system (with full-speed domain car following function).
It will be practical to own this electric car, because you know that its battery is reliable enough to actively keep you away from danger at critical moments. As stated at the beginning of the article, Yize E-Engine is an electric vehicle that can be safely entrusted to travel.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.