What are the potential safety hazards faced by power lithium-ion battery systems?

Safety hazards faced by power lithium-ion battery systems The safety risks faced by power lithium-ion battery systems are important to the characteristics of their internal components, external applications and operating environment, and constitute the primary challenge for product safety planning. Will the battery burst? The energy density of the battery used in the power lithium-ion battery system is very high. For example, the energy density of lithium iron phosphate batteries can reach 120Wh/kg. When converted to Joules, a 1kg lithium iron phosphate battery pack contains 120×3600 Joulesu003d0.43mj. So how much energy does TNT release? One gram of TNT can release 4184 joules of energy, which is equivalent to the energy contained in a kilogram of lithium iron phosphate battery is equivalent to 103 grams of TNT. A pure electric vehicle uses a battery with a general weight of several hundred kilograms. When calculated with a 100 kilogram battery, the total energy is equivalent to 10 kilograms of TNT explosives. Who is changing, my heart will get hairy, this thing will not be stable, it will be fire, it will even explode? Will you get an electric shock accident? In order to improve the driving power of the vehicle, the DC output voltage of the power lithium-ion battery is generally greater than 100V, Sometimes it can be as high as 400V. People with electrical knowledge must know that DC voltage is greater than 60V, which is dangerous. Every year, electrical appliances, wires, electrical equipment, etc., caused by leakage shock, will burst out a lot, and they are often seen in the media. When I was young, I was taken aback by the exposed 220V wires. I will never forget the smell. Therefore, we also have reason to doubt whether the high-voltage live parts of electric vehicles will leak and cause electric shock. Can you taste a variety of harsh environments? The operation and application environment of the vehicle is very chaotic, not only the high temperature and humidity test experienced, but also the high and cold plateaus, which have flat roads and uneven non-pavement roads , Are extremely boring areas, but also often wading for local needs. In the process of vehicle maturity, it has to undergo high and low temperature cycle inspections, coastal corrosive climates, rainstorms and rapid immersion, as well as various shocks, vibrations, drops, and even bumps and rolls. So, in the face of these objective circumstances, can the power lithium-ion battery system be fully tested, and there is no serious security risk of attack? Would you like all kinds of misuse? When product sales encounter large, product problems When using it, there will always be some unexpected situations or exceed the limit of the rules, which cannot be prevented. Take mobile phones as an example. When charging and maintenance fail, the phone battery may catch fire or burst due to overcharging. Assuming that the cell phone battery is pierced by sharp metal, it may burst. So, can the power lithium-ion battery system of electric vehicles undergo similar misuse detection, and does it not constitute a safety problem? These misuse situations have both man-made elements and objective environmental elements. 5) How to deal with the battery processing system failure? The power lithium-ion battery system is a messy processing and control system. It collects various operating parameters of the entire power lithium-ion battery pack at any time for accounting, diagnosis, communication and switch control. The smarter the system, the more severe the impact of a failure. For example, suppose that the battery pack inside a battery is overheated, the heat treatment system fails, and there is a risk of battery thermal runaway, and the temperature sensor is broken at this time? What should I do if the software program can’t distinguish and issue block commands normally? Or it may be a switch What should I do if I cannot disconnect normally? Does the danger expand and constitute a serious security problem? Statement: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous article: Why Lithium battery exploding news constantly?