At this hydrogen energy conference, we learned about Great Wall’s concept of laying out the entire hydrogen energy industry chain and its ability to achieve complete self-development and self-supporting, which is second to none among Chinese brands. It is worth mentioning that in the future, Great Wall’s hydrogen energy components will also support the domestic hydrogen energy industry in many fields.
In fact, what worries many people about hydrogen energy vehicles is probably the supply issue. How to efficiently produce hydrogen to supply a steady stream of market has become an important part of the promotion of hydrogen energy vehicles, and Great Wall Motors The answer was given. According to the introduction at the meeting, Great Wall will produce hydrogen through perovskite solar photovoltaic technology. It is worth mentioning that Great Wall’s hydrogen production efficiency has exceeded 20%.
This technology can be understood in principle as artificial photosynthesis, which uses sunlight to electrolyze water to produce hydrogen. This technology can reduce unnecessary chemical pollution, and perovskite is an alternative. Silicon was once an important material for efficient artificial photosynthesis, and the efficiency of hydrogen production was greatly improved.
The powertrain of hydrogen energy products roughly consists of the following four parts: hydrogen storage tank, fuel cell, energy storage battery, electric drive and power control unit
The specific working principle is as follows :
1. Electrolysis - Electrolysis of hydrogen and oxygen occurs in the stack of a fuel cell, in which hydrogen is decomposed into electrons and hydrogen ions (protons) through the positive electrode of the fuel cell (containing a catalyst). The key technology in fuel cells lies in the proton exchange membrane (ProtonExchange Membrane). The protons reach the negative electrode through the "exchange membrane" and react with oxygen to become water and heat, while the corresponding electrons flow from the positive electrode to the negative electrode through the external circuit to generate electrical energy.
2. Driving - The driving form of hydrogen energy vehicles. The author personally prefers to understand it as the extended-range mode in hybrid power. The electric energy generated by the fuel cell is continuously fed into the electric motor to drive the vehicle. At the same time, hydrogen energy vehicles still have a power battery for energy storage, and the battery will also be supplied from the fuel cell.
As we all know, hydrogen as an active chemical gas safety is the first priority. Secondly, the efficiency of the powertrain is also the focus of various car companies. More importantly, only when a technology is applied in a platform-based manner can the core technology be fully popularized. Therefore, the advantages of hydrogen energy vehicles in terms of clean emissions, efficient supply, and lightweight vehicles reflect a company’s thorough understanding of hydrogen technology.
At present, Great Wall Motors has achieved six major tasks: "Stacks and core components, fuel cell engines and components (controllers, etc.), Type IV hydrogen storage bottles, high-pressure hydrogen storage valves, hydrogen safety, and liquid hydrogen technology" The intellectual property rights of core technologies and products are completely independent and free from the constraints of foreign suppliers. At the same time, Great Wall has launched comprehensive construction from a platform perspective in the fields of commercial vehicles and passenger vehicles. It can be seen that Great Wall is full of confidence in the popularization and promotion of hydrogen energy.
Weishi Energy fuel cell has a system peak power of 95KW, a stack peak power of 120KW, and a maximum system efficiency of 60%, which is equivalent to the performance of international competitive products.
The 70Mpa high-energy-efficiency stack has a maximum allowable working pressure of 87.5Mpa and an operating temperature ranging from -40 to 85 degrees Celsius, enabling multi-point intelligent monitoring of hydrogen leakage.
The "lungs" of the fuel cell - the air compressor, the overall system efficiency is >71%, and it has the advantages of oil-free lubrication and lightweight. It is worth mentioning that Great Wall has also made plans for the next generation of air compressors, which will use a new product with a variable cross-section expansion end energy recovery unit, which can support the use of a 110KW fuel cell stack.
Great Wall’s own bottle valves and pressure reducing valves not only ensure hydrogen safety, but also can achieve flexible opening and closing under system monitoring to improve operating efficiency.
In 2018, Great Wall Holdings officially took over Shanggan Power, and after integrating resources, it built Great Wall’s own hydrogen energy system - Weishi Energy.
In April 2019, Great Wall's hydrogen energy system was launched at the Shanghai International Auto Show to meet the public. The author was fortunate to learn about its intellectual achievements and future ideas. Its concept of realizing independent research and development and popularization of manufacturing across the board starting from parts also implements Great Wall's consistent lean thinking. .
In less than two years, Weishi Energy’s Shanggan Dynamics has started cooperation with many commercial vehicles and achieved strong cooperation between independent brands. , independent innovation. At the same time, we also saw the application of Weishi's hydrogen energy products in racing cars at the meeting, which also demonstrated their determination and confidence in safety and durability.
Today, Great Wall officially released its hydrogen energy strategy to the world, which further marks that Great Wall has achieved independent control in four aspects: fuel power, electric power, hybrid power and hydrogen energy power. It can be seen that Great Wall has full confidence and confidence in these four major power technologies, regardless of technology, manufacturing or market.
In the next five years, Great Wall Motors will achieve fuel cell systems with high power (>200kW), high efficiency (>60%), high temperature (>100), high durability (>20,000 hours) and high The technological output of the Internet (new energy + intelligent network). Therefore, hydrogen energy is the most challenging of the four driving forces, and we also look forward to seeing more outstanding results from Great Wall Motors in this field in the next five years.
Finally, I look forward to the perfect debut of Great Wall’s first hydrogen energy C-class SUV this year, and for its products to shine in next year’s Beijing Winter Olympics.
Note: Some pictures are taken from the official website and the Internet, and the rights belong to the original authors. Thanks