New energy application battery technology instability is still a roadblocker

A new electric vehicle application center of Dalian Jiaoyun Group, a fully-charged pure electric bus slowly exits the compound. This car will drive from Dalian to Lushun, and travel 150 kilometers. After returning to the application center, the staff will use a single cable to dock the car with several devices that are swinging along the wall and download all the data that are running on the day.

“The main task is to see if the work of the motor and the battery is stable. In addition, we need to check the stability and matching performance of the vehicle.” A staff member of the Dalian New Energy Automotive Application Center told the China Business News last week.

Dalian is one of the first demonstration cities for new energy vehicles in China. According to the deployment of SASAC, Ministry of Industry and Information Technology, Ministry of Science and Technology, Ministry of Finance and other ministries and commissions, on the one hand promulgated stimulus policies to encourage enterprises to develop new energy vehicle technologies, and on the other hand to set up demonstration cities in China to test technologies in practice and seek a method of scale .

Dalian New Energy Automobile Application Center is one of the carriers for the demonstration and operation of new energy vehicles in Dalian. There are 25 such organizations in China, but Dalian is the first to use actual passenger transport as the inspection method.

Relatively low cost of use

Yan Jun, director of the Dalian Cargo Group Automobile Repairing Plant, said: As a new life, new energy vehicles must be re-understood by manufacturers, suppliers and even drivers and maintenance personnel to form a new system that can not be widely promoted in the short term. The practical results show that battery technology is still a big problem.

Dalian New Energy Automotive Application Center was completed in June 2009 and was built by Dalian Sail Transportation Group. In addition to the complex, the application center also has a pure electric vehicle charging center and a 4S service center. In 2008, Anhui Ankai Bus Company provided 10 pure electric buses for conference vehicles for the Dalian Davos Conference. After the meeting in Davos, the 10 passenger cars became the "Dalian-Lvshun" short-distance passenger line for new energy applications.

The Application Center hopes to find problems and propose solutions in practical applications.

Yin Chong, deputy general manager and head of the office of Dalian Jiaoyun Group, stated that the overall operation of the 10 Ankai pure electric buses in the demonstration operation was good, with a vehicle rate of more than 97%, meeting operational requirements. Under the conditions of air-conditioning, a single mileage can reach 170 kilometers; if it does not start, it can travel more than 250 kilometers.

In terms of the cost of use, it consumes only about 1.4 kWh per kilometer and the cost of use is one-eighth of that of a similar conventional vehicle. In particular, there is no maintenance cost for conventional automobile wearing parts such as engines and filters, and thus the use cost is relatively low.

In actual operation, many problems have also been found, especially battery issues. In addition, although the auto company claims that the maximum number of single-trip kilometers can reach 200 or even 300 kilometers, the actual operation shows that a single trip mileage of more than half of the maximum kilometers will cause damage to the battery. Take Ankai pure electric bus as an example, although the maximum single-mile mileage can reach more than 250 kilometers, if the battery is full and the battery is exhausted every time, the battery life will be damaged.

Battery problems need to be solved

"When the battery is discharged to 50%, it must be recharged to protect the performance of the battery and the car. It cannot be charged for 130 to 180 kilometers before charging." Yan Jun said that if the battery power consumption is frequently depleted to more than 70%, then Car batteries may be completely scrapped in 3 to 5 years.

In the center of the application center, a pure electric bus driver told reporters that he cannot drive a pure electric bus in the habit of driving a traditional automatic car. "When you go uphill, you have to pull a handbrake. When the motor reaches a certain speed, the car will go forward, otherwise it will slip."

He said that the forward and backward movement of the electric vehicle is accomplished by rotating the motor in the forward and reverse directions. If it cannot reach a certain speed, it lacks the forward driving force that is available after the automatic transmission has been engaged.

It is worth mentioning that the business model of charging pure electric vehicles in the form of charging stations is also challenged. The above driver stated that the pure electric passenger car could not be recharged when it had just turned off. "The battery temperature is high at this time and it cannot be recharged immediately. Otherwise, there will be danger. The car must be left cold."

Yan Jun said that after the battery has been running for a period of time, it must have an intermittent charge, which he will call "safety time." As a result, the time for the electric vehicle to recharge is extended, plus it takes 15 to 30 minutes for the battery to be charged in the fast charge mode. The convenience of the electric vehicle cannot be compared with that of the conventional car.

From the operation of Dalian New Energy Automotive Application Center in the past year, it was found that when the temperature is too hot, the battery failure rate is relatively high and the power output is unstable. How to ensure the stability of electric vehicles is still a "very important and very difficult" problem.

"What exactly is the prospect of commercialization? First, it is impossible to achieve similar commercial benefits in the near future. Second, with the advancement of battery technology, in the same proportion, the cost of electric vehicles is lower than that of gasoline and diesel vehicles." Indicated.