ChaoJi Charging System: It’s not just the speed of energy replenishment that’s excellent


As winter approaches, many new energy vehicle owners report that the charging speed of their new energy vehicles has dropped significantly due to low temperatures. In fact, not only in winter, slow charging has always been one of the pain points for new energy car owners to replenish energy.

As winter approaches, many new energy vehicle owners report that the charging speed of their new energy vehicles has dropped significantly due to low temperatures. In fact, not only in winter, slow charging has always been one of the pain points for new energy car owners to replenish energy.


The ChaoJi charging system (hereinafter referred to as ChaoJi), led by the China Electricity Council and led by power grids, charging operators, connector manufacturers, and some car companies, is expected to solve this problem. It is understood that compared with the current mainstream fast-charging charging piles that support 60 kilowatts or 120 kilowatts, ChaoJi's charging voltage and current upper limit have been increased to 1,500 volts and 600 amps respectively, and the maximum power can reach 900 kilowatts.

So, in addition to improving charging speed, what other improvements does ChaoJi have compared to the current charging system? What are its future application scenarios? With these questions, reporters from Science and Technology Daily interviewed relevant experts.


Existing charging systems face three major problems


In recent years, as the popularity of electric vehicles continues to increase, charging problems have become increasingly prominent. Liu Yongdong, deputy secretary-general of the China Electricity Council and director of the Standardization Management Center, said that from a technical perspective, there are currently three main problems with domestic and foreign new energy vehicle charging systems.


The first is that the technical route is complex and the systems are incompatible with each other. The mainstream charging systems in the world, in addition to the national standard charging system (GB/T) independently developed by my country, also include CHAdeMO developed in Japan, CCS jointly developed by Europe and the United States, etc. The communication protocols and power levels between different systems are different. This increases the design and production costs of car companies. The second is that technology forward-looking needs to be strengthened and backward compatibility issues need to be further considered. In the early stages of construction of new energy vehicle charging facilities, most countries lack a system-level architecture. This results in the current mainstream charging system being unable to meet the future development needs of new energy vehicles (such as high-power charging, advanced communications, etc.). The third is that product reliability needs to be further improved. These problems have restricted the sustainable development of the new energy vehicle industry.

"ChaoJi is not just a connector, but a complete DC charging system for electric vehicles including charging connection components, control and guidance circuits, thermal management, etc." Liu Yongdong said, compared with existing mainstream charging systems , ChaoJi has outstanding advantages in terms of forward and backward compatibility, charging safety, charging power, user experience and international recognition.


It is forward compatible and also backward compatible


Does the emergence of a new charging system mean that the existing charging system has to be dismantled? the answer is negative. ChaoJi enables smooth upgrades of charging systems between old and new generations.


How is this smooth upgrade of the charging system achieved? Zhang Xuan, senior engineer of the State Grid Electric Power Research Institute Co., Ltd., mentioned at the 2023 (6th) Power Distribution Technology Summit Forum that ChaoJi uses an adapter conversion interface, so that existing charging facilities can be charged without any modification. Connect and charge with ChaoJi-compatible vehicles.

At the same time, ChaoJis charging piles can also charge cars using existing charging interfaces.


Not only that, ChaoJi is a system that can grow.Liu Yongdong introduced that while ChaoJi is forward compatible, it also achieves backward compatibility by reserving upgrade interfaces. It is understood that ChaoJi has reserved upgrade interfaces in both software and hardware to meet the various needs of market segments.


For example, ChaoJi can achieve ultra-high-power charging through interface combination upgrades, increasing the charging speed by another order of magnitude to meet the charging needs of heavy-duty commercial vehicles, electric ships and electric aircraft.

Realizing interaction between vehicles and piles is also one of the goals for the development of new energy vehicles. The so-called vehicle-pile network interaction means reducing the charging power of charging piles during peak power consumption periods, and using new energy vehicles as mobile energy storage devices to transmit power to the grid, thereby reducing the load pressure on the grid. In terms of standard construction and communication protocols, ChaoJi has also reserved solutions for realizing interaction between vehicles and piles.


In addition to being compatible with Chinas current charging system, ChaoJi is also compatible with other charging systems around the world. The reporter learned that ChaoJi has the same underlying logic as other charging systems around the world and is compatible with existing international mainstream DC charging systems.


"We have attracted experts from Japan, Germany, the Netherlands and other countries to participate in the research and development of ChaoJi," Zhang Xuan said. At present, ChaoJi has been fully adopted in the relevant standard proposals of the International Electrotechnical Commission. "ChaoJi not only has an international platform, but also is internationally recognized." Liu Yongdong said.


Optimized design improves user charging experience


ChaoJi was born to solve the problems encountered by new energy vehicle users during the charging process and improve their charging experience. In response to common problems such as large interfaces and insufficient safety during charging, ChaoJi has absorbed the advantages of the current international mainstream DC charging interface systems. The interface structure is small and lightweight, and has been designed in terms of mechanical safety, electrical safety, electric shock protection, fire protection and thermal safety. Fully optimized.


In terms of mechanical safety, "We conducted experiments and comparisons with charging interfaces of CHAdeMO, CCS and the 2015 version of the national standard." Zhang Xuan said. A large number of tests such as rolling tests and high-speed drop tests have proven the superiority of the mechanical performance indicators of the ChaoJi interface. In addition, for electrical safety, ChaoJi significantly reduces downtime and insulation detection time.


The reporter learned that ChaoJi supports a maximum charging power of nearly 900 kilowatts. "ChaoJi can meet the charging needs of different power levels of large, medium and small. It can achieve slow charging in places such as homes, shopping malls and hotels, and fast charging in places such as highways and gas stations." Liu Yongdong said.

ChaoJi,New energy,EV,Charging Station