Step utilization analysis of electric vehicle power battery

With the increasing sales share of electric vehicles in the automobile market, the disposal of old batteries in electric vehicles has attracted more and more attention from all walks of life. The secondary utilization of used battery components can indirectly reduce the cost and price of batteries and reduce the pollution of battery waste to the ecological environment. Used batteries can also be used as energy storage components to provide some auxiliary services for power grid system and power market. The reutilization of old batteries will open up an emerging market.

In China's new energy automotive industry at the beginning of the large-scale promotion, power battery arrangement in use has been mentioned. Since 2011, power battery recycling work included in the application of new energy vehicles by the policy system in China, the government is 2012 to 2020, energy saving and new energy automobile industry development plan, clear planning for power battery recycling work. But due to the time of the power battery in the demonstration operation stage mostly, power battery pilot work has not really use.

With explosive growth of the new energy vehicles, power battery recycling market is also growing. Data show that by the end of 2017, China's new energy vehicles, electric cars, sales volume has reached 770000, has more than 1.6 million cars, half of the world. According to forecast of China automotive technology research center, as the electric vehicle market has grown in size and power battery will usher in "scrap tide" in China, the average power battery discarded for 5 ~ 8 years, from 2018 to 2020, the national total scrap power battery will reach 120000 ~ 200000 tons, to 2025 power battery scrap quantity or scale of 350000 tons, is about 20 times the amount of 2016 scrap.

As the society pay more and more attention to problems of environmental pollution and carbon emissions, for retired power battery arrangement in use, has long been regarded as the main place for new energy vehicle power battery retirement, however, others from the safe and economical level consideration, thought power battery arrangement in use is a "false". However, as China power battery service is the approach of the tide, and reporting of the standards, power battery arrangement in use will be retired in cell size and policy to get more support and arrangement in use is imperative.

Zhongguancun, said zhang jing, deputy secretary-general of energy storage industry technology alliance power battery in energy storage phase using do exist some problems, but said it is "false", it seems, are still not good. A view from the perspective of cost saving, green development that will be retired power battery for energy storage, can reflect the value of whole life cycle of power battery, also can save some cost, and make Lithium ion batteries truly "green"; The other side is from a technical point of view, think through the use of power system, the performance of batteries already had a big change, and then used for energy storage systems, batteries performance problems, and solutions to these problems will increase the cost of more investment.

Zte Feng Chaohui can send marketing division general manager said if arrangement in use, large-scale energy storage is not retire the choice of power battery, such as an electric car with about 30-100 KWH, electricity and large energy storage power station is usually at around 6-7 MWH, a large energy storage power station is equivalent to thousands of electric cars, demand for batteries in terms of consistency, obviously is much higher than electric cars. And 2-3 genius to charge electric vehicles, and energy storage power station basic cycle at least once every day, it also has higher requirements for the related features of batteries. Large storage projects in many ways, the requirement of batteries is much higher than that of electric cars.

Sun power senior technical manager wu lei, also said retired power battery is the most difficult step screening. Every car driving condition is different, lead to can't agree the battery capacity, internal resistance, and number of batteries energy storage system and auto power system is not an order of magnitude, screening of heavy work. Even after successful screening to application in energy storage systems, batteries, how to manage these different working conditions, is also a problem.

Amd in zhejiang electric power co., LTD. Energy storage department general manager li said the pilot battery discharge ratio reached 0.3 C above is relatively difficult, power battery in the field of energy storage arrangement in use and limitations, and improve the precision of photovoltaic power generation forecasting curve, temporarily do not recommend using pilot battery technology

Germany Rhine TUV, general manager of greater China solar energy and fuel cell technology service Li Weichun said, in the use of power battery arrangement, need some criteria to judge whether retired battery for energy storage, and according to what standard for application.

The Chinese academy of engineering academician Yang pointed out that the electrochemical energy storage have ten performance, the most important is security, only on the premise of ensuring security, electrochemical energy storage can play its role in the energy revolution, promote the development of China's green energy. Is also for this reason, the security requirement of large energy storage projects is very high, need to be more careful in the choice of the batteries. And power battery arrangement in use, should also focus on micro nets, standby power, such as small energy storage areas, or application in the field of electric bicycle and low-speed electric power.

These views show that retired power battery to arrangement in use in the storage, application system should be as simple as possible, or do more harm than good.

From the perspective of the whole new energy vehicle industry, the larger the scale of power batteries put into use, the more difficult it will be to manage, and the more standardized and standardized the size and specification of power batteries. On August 4, 2017, GB/T34015-2017 more than the vehicle power battery recycling - to detect ", GB/T34013-2017 "electric car with size of power battery products, GB/T34014-2017 the auto power battery coding rules three power battery details of the national standard has been formally announced. The three national standards have made it possible to power battery information back, pilot use more safe, orderly and standardized. On October 11, the national development and reform commission website hanging out the "about promoting the development of energy storage technology and industry guidelines" (hereinafter referred to as "guidelines") describes the energy storage technology development "road map" for ten years, among them, points out that perfecting the whole life cycle of power battery regulation, to eliminate power battery energy storage arrangement in use of study.

From the recommended national standards come on stage to a country compulsive standard, power battery arrangement in use are getting more and more powerful support. Now, industry internal debate not pilot use of authenticity, but how will the power battery arrangement in the use and the development of new energy vehicles seamless, pushes forward power battery arrangement in use.

Chaowei group has a set of detailed solutions for power battery cascade utilization: lithium battery recycling price about 20% of the price of new battery, if the lithium power battery recycling design parameters and operation data and conform to the requirements of the arrangement in use, good company, after inputting energy storage system with parameter directly into the Treasury as with battery energy storage system. If the design parameters and operation data of recycled lithium battery pack are not clear, chaowei group will test the electrical performance and safety performance. If the battery pack meets the requirements of energy storage application, the data will be directly input into the configuration parameters of the energy storage system, which will be put into the storage as the battery configuration of the energy storage system. If the entire lithium battery does not meet the energy storage requirements, the basic module unit will be tested, and if it meets the requirements, it will be stored as the energy storage battery. Those who do not meet the requirements shall enter the recycling warehouse.

Tianjin Lishen battery Co., LTD., deputy chief engineer Su Jinran from energy density, cost, standardization, automation, technology maturity and pilot in 18650 and 21700 is analyzed in six dimensions of quality of the battery. By contrast, Su Jinran believes that in 18650 than 21700 energy density and cost advantage obviously, but in the use of technology and the maturity of pilot, 21700 than 18650. China produces 21700 battery time is not long, power battery retirement period and 21700 years, 21700 pilot use can also further research and exploration.

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