Three technical bottlenecks in the development of power lithium batteries

The key factors for the development of China's power vehicles are cruising range, charging speed and safety performance. These three factors are caused by the power lithium battery technology, so it can be regarded as the three technical bottlenecks of the power lithium battery.

First, the cruising range is short: With the continuous maturity of technology, the cruising range of electric vehicles with lithium batteries as the power source has increased from less than 100 kilometers to the current mainstream of 300 kilometers, and the cruising range of individual models has exceeded 400 kilometers. . However, there is still a certain gap compared with the current mainstream mileage of fuel vehicles of 500 kilometers. This problem can be solved by multiple strings of single cells, but the negative problem is that the volume is too large, which increases the inconvenience of driving.

Second, the charging speed is slow: relative to the driving mileage is short, but the slow charging of the power lithium battery is a greater constraint on the development of electric vehicles. At normal speed, the power lithium battery of an electric car needs to be fully charged for 4 to 8 hours. There are also fast-charging lithium batteries, which can be fully charged in 1-2 hours, but the negative impact is extremely great, the life will be reduced to 1/3, and the battery performance will drop significantly. Fuel vehicles do not have these problems. The refueling time is less than 5 minutes, and safety and stability are guaranteed.

Third, safety performance to be improved: since the birth of lithium-ion batteries, security issues have been plaguing consumers. From mobile phones and notebooks to today's electric cars, security incidents continue to occur. In addition to Nissan and Tesla's electric vehicles have not been reported, China's Zotye and BYD, the United States and the Fiske electric vehicles have spontaneous combustion or fire incidents.

The existence of the above three problems makes the lithium battery increase the research and development cost of overcoming these three shortcomings, and the high-priced products also restrict the development of the power battery and the power battery electric vehicle.

The page contains the contents of the machine translation.