my country's power battery research is mainly focused on improving its safety performance and service life, but there are very few recycling links. With the advent of the blowout of new energy vehicles, it is still very necessary to learn from relevant foreign experience to establish a complete power battery recycling system.

　　The research on power batteries in the United States is relatively comprehensive, and a sound business operation model has been formed. General Motors and ABB have achieved certain success in the experiment. The electric energy collected by the Chevrolet Volanda battery pack is fed back to the grid, and finally home and commercial power supply is realized. After trying, the re-integrated modular device can support two-hour power supply for 3-5 American households. In the near future, similar applications will be able to provide backup power for some homes and small commercial buildings in the event of a power outage. At the same time, storing electric energy during the preferential period of electricity price for use during peak hours can also make up for the gap in wind power, photovoltaic or other renewable energy generation.

　　In Germany, battery manufacturers and importers must register with the government, distributors must organize a recovery mechanism, and users are obliged to hand over used batteries to designated recycling agencies.

　　The implementation of this extended producer responsibility system and the establishment of a perfect battery recycling system. At the same time, the German Ministry of Environment has funded two power battery recycling demonstration projects to conduct research on the resource utilization of waste power batteries.

　　The most popular treatment method in Japan is to use scrap lithium batteries to build a solar power generation system. When the sun is full, the solar panels generate electricity and output power to the power storage system, which supplies power to the household appliances; if it is cloudy or at night , You can choose to buy electricity from the power company to charge the power storage system during the time when the electricity price is low, and only take electricity from the power storage system during the time when the electricity price is high.

　　Is it reliable to buy a second-hand electric car?

　　At this stage, the second-hand new energy vehicle market in major first-tier cities is almost "blank", both "priceless" and "no market." However, with the increasing number of electric vehicles, the issue of value preservation of second-hand vehicles, and the issue of recycling of waste batteries in vehicles, relevant government departments and manufacturers will plan their countermeasures in advance. But we have to admit that, whether it is time-sharing lease or private purchase, new energy vehicles have been increasingly involved in our lives. Practitioners in the second-hand car trading market pointed out that they are reluctant to buy second-hand new energy vehicles because the market does not yet recognize them, and the demand from buyers is too low to sell.

　　The current situation of the second-hand electric vehicle market

　　The status quo of second-hand new energy vehicles: First, the car dealers are unwilling to purchase. The price fluctuates, and the price is tens of thousands of yuan. The price is reduced by more than 100,000. The purchase price has no strict measurement standard. Second, the follow-up issues are more complicated, and the maintenance is very limited. You can only book in advance in the 4S store, which is somewhat difficult for consumers who are not around. Third, endurance is worth considering. After all, new energy vehicles are not driven by engines but by electric motors. The service life and endurance of batteries is a critical point, and it is difficult to guarantee the performance of purchased second-hand cars in this regard.