Three technologies fully guarantee battery safety
At the 'MoreThanSafe Non-combustion Battery Technology Conference' held on March 19, Weihong announced its exclusive non-combustion battery technology for the first time, which is passively defended through non-combustion electrolyte, high temperature resistant diaphragm, and smart fluid (STL) The concerted efforts of the three aspects of technology can effectively reduce the possibility of fire and explosion of the power battery, and maximize the safety of the battery. Non-burning electrolyte: As we all know, the main reason for lithium battery accidents is the internal short circuit. What are the reasons that cause the internal short circuit of the battery? What are the main reasons? After analysis, Weihong got the answer. Among the causes of the short circuit, the electrolyte combustion heat is as high as 72%, while the positive electrode reaction heat accounts for only 6%. Since the electrolyte has the greatest probability of problems, Weihong has locked the main attack direction of the non-burning battery technology on the electrolyte. After 8 years of concentrated scientific research and countless formulation adjustments, Weihong finally developed a non-burning electrolyte. In the comparative test conducted on-site, the ordinary electrolyte burned quickly when it encountered an open flame until it was completely burnt out, while the non-burning electrolyte developed by Weihong not only did not burn when it encountered an open flame, but the open flame was extinguished. It can be said that the non-burning electrolyte solves the key problem of combustibles in the battery. In order to ensure that batteries that use non-burning electrolyte can be charged quickly and have a long life, Weihong also conducted a long-term test on the new battery for one year, and finally came to the conclusion: the new battery can be fully charged within 10 minutes and reach The result of 10,000 cycles. High-temperature resistant diaphragm: While developing the non-burning electrolyte, Weihong did not relax the research on high-temperature resistant diaphragm technology. After the '8-year war of resistanceThe melting point of this material is higher than 350°C, the decomposition temperature is higher than 400°C, the combustion grade is self-extinguishing, and the chemical performance is stable, and it will not dissolve in electrolyte. The high temperature resistant diaphragm has better heat resistance than ordinary diaphragms. Even if it is baked in an oven at 300°C for one hour, no deformation will occur, which fully guarantees the internal stability and safety of the battery and solves the problem of open flames in the battery. The problem of fire source. Smart fluid (STL) passive defense: In order to fully protect the safety of the battery, Weihong Power has also done enough work on external protection. Weihong has developed the Smart Fluid Passive Defense Technology (STL for short), which prevents the leaked electrolyte from contacting the air through immersion, thereby isolating the oxygen required for combustion. At the same time, STL can also detect liquids through the insulation detection function of the BMS, and find the leakage of the battery pack in time. This technology is also more accurate and faster than the current method of detecting whether there is a safety hazard through the air temperature. Picture So can this new technology play its due role? Weihong produced tangible evidence. On the eve of Thanksgiving Day in 2015, one of the 1,000 double-deck electric bus batteries that Weihong sold to the UK caused a small amount of electrolyte leakage due to improper operation during installation, and the staff neglected to check because they rushed home for the holiday. It was not until a week later that it was discovered that the battery pack did not catch fire because of the use of STL passive defense technology, and a safety accident was avoided. This technology can be described as the exclusive research and development of Weihong, but for the development of the entire industry, Weihong CEO Wu Yang said that Weihong is willing to disclose this technology because the technology is low in cost, but it will bring higher battery safety. We are willing to contribute to the entire industry and my country’s electric vehicle industry.