Share with friends and circle of friends with wechat scan QR code < / P > < p > < p > surging journalist Cui Zhuzhu < / P > < p > on April 9, at the press conference of GAC technology day 2021, < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E5%B9%BF%E6%B1%BD%E9%9B%86%E5%9B%A2 "> GAC group (601238) announced that it will work together with HUAWEI to develop L4 class automatic driving vehicle, which is planned for mass production in 2024. < / P > < p > in addition, GAC group released the power < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E7%94%B5%E6%B1%A0 "> battery < / a > technology strategy" neutron star strategy ": the group will deeply carry out independent R & D and industrial application of power battery and cell, and open the era of" low carbon new powertrain ". "Neutron star strategy" will promote technology from three aspects: cell, BMS (Battery Management) system and battery pack. At the same time, GAC group plans to achieve self-development and large-scale carrying application of power battery cells within three years, realize self-development and self production in the medium and long term, and gradually move to the front of the stage. < p > < p > GAC group also launched the "sponge silicon negative electrode battery technology" independently developed by GAC group. According to Mei Ao, head of battery R & D Department of GAC Research Institute, the technology includes "nano composite silicon technology", "self repairing adhesive technology" and "gradient composite coating technology", which makes the silicon negative plate inside the battery soft and elastic like a sponge, so that the expansion and contraction of silicon in the process of charging and discharging are limited and buffered, and will not break. At the same time, it is also like sponge absorbing water, so that the silicon anode can give full play to the advantage of large capacity and store more energy. Through this technology, the volume and weight of lithium-ion battery cell can be reduced by 20% and 14% respectively, and the volume and weight will be reduced by more than half in the future. The technology also has obvious effect on prolonging the service life of lithium-ion battery and improving the reliability of lithium-ion battery. < p > < p > GAC group said that it has been tested by a third-party authoritative testing agency according to the national standard working conditions_ blank" href=" https://news.163.com/news/search?keyword=%E7%BB%AD%E8%88%AA "> endurance < / a > test, GAC aion LX equipped with sponge silicon negative electrode battery technology can achieve endurance mileage of more than 1000km. At the same time, the vehicle has carried out high temperature and cold test in summer and winter, with excellent performance, strong power, safety and reliability. According to the introduction, the technology uses new conductive materials to build efficient three-dimensional conductive network and improve the conductivity of electrode materials; it uses coated ceramic diaphragm and new high-power electrolyte to improve the rate performance and thermal stability of the battery. < / P > < p > with the help of this technology, GAC group will launch two versions of 6c-500km and 3c-500km fast charging batteries to meet the fast charging needs of different users, which will be carried on GAC aion V for the first time in September this year. < / P > < p > in addition, GAC group also announced that it will jointly promote the layout of super fast charging network, and plans to layout more than 100 super fast charging stations in 2021. < / P > < p > it is worth mentioning that GAC group has caused great heated discussion in the industry due to the battery technology notice.

in January 15th this year, the official WeChat public of Guangzhou Automobile Group, the official account of Guangzhou Automobile Group, has just released a new power battery technology posters. It said that the graphene based super fast charging battery can be filled with 80% minutes in 8 minutes, and the NEDC battery life range of the silicon negative battery reaches 1000 km. < / P > < p > after the release of this poster, the outside world believed that the battery technology released by GAC could fill 80% in 8 minutes at the same time, and the NEDC could last 1000 kilometers. Therefore, the enthusiasm of the capital market was ignited instantly, and the stock price of GAC group quickly turned to the trading limit on that day. On January 16, Ouyang Minggao, an academician of the Chinese Academy of Sciences, said in his speech, "if someone says that it can run 1000 kilometers and charge the electricity in a few minutes, it's very safe and the cost is very low. You don't have to believe it, because this is an impossible problem. There has been no major breakthrough in this area in recent years. " < / P > < p > at that time, many people thought Ouyang Minggao's view was slapping GAC group in the face. In response, Gu Huinan, general manager of GAC EA, said that academician Ouyang's original words were that everyone was discussing the progress of battery technology, requiring fast charging, long battery life, safety and low cost. At present, it is still unrealistic, so supporting facilities such as energy storage equipment are needed. Gu Huinan hoped that everyone would not confuse technological breakthroughs with commercial promotion, and said that he would definitely push 1000 km range vehicles within this year. Subsequently, GAC group also issued an announcement to clarify that graphene based super fast charging battery and long-term silicon negative battery are two different battery technologies, which respectively solve the different pain points of "slow charging speed" and "short driving range" in the application of power battery.