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　　Car companies actively explore electric-electric hybrid technology routes to become new favorites

　　Although hydrogen fuel cell vehicles, one of the three verticals, have been ignored in the past years, in the past two years, hydrogen fuel cell vehicles are receiving more and more attention and attention in our country and even around the world. Especially at the policy level, while subsidies for pure electric vehicles are gradually declining, support for hydrogen fuel cell vehicles has not been reduced at all for lithium-ion batteries. With the support of the state and the attention of companies, the development pace of hydrogen fuel cell vehicles has gradually accelerated in recent years. Therefore, in the development process of hydrogen fuel cell vehicles and pure electric vehicles, there is another debate about who will dominate the world. However, in the opinion of many industry insiders, the two development routes of hydrogen fuel cell vehicles and pure electric vehicles are not absolutely parallel. The two can also overlap to achieve the complementary advantages of the two routes.

　　At the 2018 Global Future Mobility Forum held recently, many domestic car companies talked about the exploration of electric-electric hybrid vehicles that combine lithium-ion batteries and hydrogen fuel cells. This technical route is not new. Zhang Tong, a professor at the School of Automotive Engineering at Tongji University, said in an interview with reporters that in view of the current situation that domestic fuel cell power is generally low, electric-electric hybrid is a development route that is more suitable for my country's national conditions.

　　Domestic and foreign car companies pay attention to electric-electric hybrid routes

　　At a time when the large-scale promotion and popularization of hydrogen fuel cell vehicles is still restricted by many factors, especially technical level factors, the technical route of electric-electric hybrid has been constantly mentioned in recent times.

　　At last year's Frankfurt International Motor Show, Mercedes-Benz announced the launch of its first plug-in hydrogen fuel cell hybrid vehicle, GLCF-CELL, which uses hydrogen fuel cells and lithium-ion batteries as energy sources. It is reported that this product can load 4.4kg of hydrogen fuel, and the inflatable bottle is placed under the chassis, allowing the car to travel 437km before refilling. A 9kWh lithium-ion battery installed at the rear of the vehicle can assist in driving the vehicle for 49km. Its operating modes include dual energy hybrid, single fuel cell mode, single lithium-ion battery mode and charging mode. Among them, the vehicle in the hybrid mode can obtain power source from the dual power device, powered by lithium battery. The ion battery supplies peak power, while the fuel cell operates within an optimal economic range.

　　Our country started on this technical route no later than foreign countries. At the Second International Exchange Conference on the Development of Hydrogen Energy and Fuel Cell Industry held at the end of last year, Yangtze River Bus went into hydrogen installation and realized the commercial operation of power lithium batteries and hydrogen fuel cells with electric range extension. With the help of electric and electric hybrid, The longest driving range of Changzhong buses has increased from 390km in pure electric mode to 600km in hybrid mode. It only takes 10 to 20 minutes to refill hydrogen fuel during operation. At the 2018 my country Electric Vehicles Conference of 100 Forum held in January this year, Cao Zhong, chairman of Hangzhou Changjiang Holdings Company, proposed that the combination of electric vehicles and renewable energy will achieve a breakthrough in the new energy vehicle industry, and hydrogen + electric hybrid lithium-ion batteries Combination will be the most suitable technical route and will surely play a major role in the market segment of alternative fuel vehicles.

　　Compensating for power shortage and reducing costs are important purposes

　　Why have domestic and foreign car companies begun to implement the electric-electric hybrid technology route?

　　Zhang Tong told reporters that for domestic car companies, there is still a certain gap between the technical level and foreign advanced levels, making it difficult for the power of domestic hydrogen fuel cell systems to reach the level of foreign car companies such as Hyundai and Toyota; but on the other hand , the domestic lithium-ion battery industry has certain advantages, so the development of electric-electric hybrid technology is more practical and more economical.

　　When talking about the original intention of foreign car companies, such as Mercedes-Benz, to launch related products, Zhang Tong is more inclined to believe that the purpose of foreign car companies developing electric-electric hybrid vehicles is to reduce the production cost of hydrogen fuel cell vehicles. In fact, even in Japan and South Korea, which are relatively mature countries, the high production cost of hydrogen fuel cell vehicles is still an important factor that hinders their further large-scale promotion and application. By combining with lithium-ion batteries, the power of the fuel cell system can be appropriately reduced within a reasonable range, thereby reducing product costs. Zhang Tong said.

　　Industry insiders pointed out that fuel cells have the problem of slow dynamic response. When the operating status of the vehicle changes drastically in a very short period of time (such as starting, rapid acceleration), the power system is often unable to achieve the power required by the vehicle, but lithium Ion batteries can solve these problems. The lithium-ion battery supplies the high power required in unsteady conditions such as vehicle acceleration and deceleration, while the fuel cell is used to supply output power under stable operating conditions. In addition, electric-electric hybrid can solve the electronic control problem of electric vehicles through lithium-ion batteries, and at the same time use hydrogen fuel cells to solve the driving problem of electric vehicles, which can be said to kill two birds with one stone.

　　my country’s characteristic technical route

　　At the 2018 Global Future Travel Forum held recently, the relevant person in charge of Guangdong Tyros Automotive Power System Co., Ltd., which uses the Yangtze River electric bus as a development platform, introduced that the company has passed the national mandatory test, entered the national hydrogen vehicle notification catalog and Small batch production has been carried out; next year it will form an annual production capacity of 100 to 500 units (sets); in 2020, it will form an annual production capacity of more than 1,000 units (sets); in 20212022, it will have an annual output of 10,000 units (sets) production capacity, becoming an important domestic supplier of hydrogen fuel cell power systems for vehicles.

　　Although foreign car companies also have plans for electric-electric hybrid products, Lei Hongjun, general manager and chief engineer of Dongfeng Yangzijiang Automobile, still calls this technical route a Chinese characteristic. In his view, there are four reasons why my country has developed this route. First, the power of fuel cell engines at home and abroad is difficult to meet product demand. The power density of domestic fuel cell engine stacks is about 2kW/L, while the international advanced level is It has reached 3kW/L; secondly, due to the scale of the industry, the current unit cost of fuel cell engines is still relatively high; thirdly, the current hydrogen-electric hybrid system is based on powered lithium battery vehicles, which can make up for many shortcomings of powered lithium battery vehicles. , such as shorter driving range; finally, my country's fuel cell vehicles have made significant progress, but they are still facing many challenges. The electric-electric hybrid system is a relatively stable technical solution.

　　Lei Hongjun pointed out that with the expansion of cities, pure electric vehicles are unable to cope with long-distance driving. Therefore, long-distance buses between cities are expected to become the main battlefield for the application of hydrogen-electric vehicle technology. However, he also pointed out: For automotive engineering, the simpler the system structure, the better, and 'electric and electric hybrid' are two systems, which also puts forward higher requirements for system integration. Therefore, when developing hydrogen hybrid technology, do not Artificially added difficulty.

　　Zhang Tong believes that electric-electric hybrid is not a technical route in the transitional stage. This route will exist for a long time. In the future, hydrogen fuel cell systems will play an increasingly important role in electric-electric hybrid vehicle products. Therefore, the development of high-power Hydrogen fuel cell systems are imperative. For hydrogen fuel cell vehicle companies, the power level of the hydrogen fuel cell system must not stay at the current 30kW, and the research and development of high-power fuel cell systems should continue to be accelerated.

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