How about the safety of power lithium-ion batteries?

Safety of power lithium-ion batteries Lithium-ion batteries have been widely used in small portable electronic devices such as mobile phones and notebook computers. Since the lithium-ion batteries used in these devices have a small capacity (1-2ah or less), and most of them are single-cell batteries, the battery safety problem is not serious. Even so, in recent years, for safety reasons, Japan's Sony has recalled about 1 million laptop batteries from all over the world. Occasionally, cell phone batteries explode and catch fire. Lithium-ion batteries with a single battery capacity of 10Ah or even 100Ah can be used as power sources for electric bicycles, pure electric vehicles, hybrid vehicles, and electric tools. Security issues have attracted global attention. Safety is the basic requirement of power lithium-ion batteries. According to different power output performance, power lithium-ion batteries can be divided into energy type and power type. Energy-type power lithium batteries usually have a large capacity and can provide relatively long-lasting energy supply for power equipment. They are usually used in pure electric vehicles, medium-duty or heavy-duty hybrid vehicles. The total energy of such batteries occupies a large proportion in the energy distribution of the vehicle, often exceeding 10KW. This can not only partially absorb the energy of the vehicle's braking feedback, but also increase the mileage of the vehicle in pure electric mode and reduce the total emissions of pollutants. Power-type power lithium batteries usually have a small capacity and can supply instantaneous high-current power to electrical equipment. It is mainly used in electric tools and hybrid vehicles to absorb braking feedback energy and provide instantaneous additional energy for vehicle startup and acceleration. Generally speaking, the total energy stored in a lithium-ion battery is inversely proportional to its safety. With the increase of battery capacity, the volume of the battery also increases, and its heat dissipation performance is getting worse and worse, so the possibility of accidents will greatly increase. Regarding mobile phone lithium-ion batteries, the basic requirement is that the probability of a safety accident is less than 1/106, which is also the lowest standard acceptable to the public. However, the safety of large-capacity lithium-ion batteries, especially high-power lithium-ion batteries for automobiles, is particularly prominent and has always been the focus of research. However, with the in-depth research and application of large-capacity lithium-ion batteries, safety problems such as overcharging and short-circuit abuse have become increasingly prominent, which have become technical problems that must be overcome for large-scale applications of power lithium-ion batteries. The working conditions of power lithium batteries are very bad. Important safety issues are explosions, burning, battery leakage and electrical fires caused by battery packs. There are many reasons for battery safety problems, and the main focus is on the hidden dangers of battery overcharging, internal and external short circuit, and the rearward movement of the battery during the use of the battery pack. Safety is one of the important obstacles to the practical application of large-capacity lithium-ion batteries. With the development of lithium-ion batteries and the development of raw materials, there have been breakthroughs in the safety of lithium-ion batteries. At present, 10-100ah power lithium-ion batteries and battery packs have passed industry safety testing standards. The important factors that affect the safety of lithium-ion batteries are electrode materials, electrolytes, manufacturing processes and conditions of use. With the advancement of material science and production technology, electrode materials with high stability performance are selected to contain flame retardants or overload protection electrolyte additives, and battery protection circuits have a well-designed heat dissipation structure and management system to improve the safety of lithium-ion batteries, so Safety issues to be solved by large-capacity power lithium-ion batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to use and maintain the lithium-ion battery of a balance car?