What safety risks does the power lithium battery system face?

1) Will the battery cell catch fire and explode? The battery cell used in the power lithium-ion battery system has a very high energy density. Take the lithium iron phosphate battery cell as an example, the energy density can reach 120Wh/kg, which is converted to Joule, 1 kg The lithium iron phosphate battery contains 120×3600 Joulesu003d0.43MJ. So how much energy does TNT explosives release? 1 gram of TNT explosives can release 4184 joules of energy. When converted, 1 kilogram of lithium iron phosphate batteries contains the same energy as 103 grams of TNT explosives. A pure electric vehicle usually uses batteries weighing several hundred kilograms. Calculated with 100 kilograms of batteries, the total energy is equivalent to 10 kilograms of TNT explosives. If you change who it is, your heart will get hairy. Will this thing be unstable, will it catch fire, or even explode? 2) Will there be an electric shock accident? In order to improve the driving efficiency of the vehicle, the DC output of the power lithium-ion battery The voltage is usually above 100V, sometimes as high as 400V. Anyone with certain electrical knowledge knows that a DC voltage exceeding 60V is a dangerous voltage. Every year, there are many electric shock accidents caused by leakage of electrical appliances, wires, power equipment, etc., and they are often seen in the media. I was shocked by exposed 220V wires when I was young, and I will never forget the taste. So, people also have reason to doubt whether the high-voltage live parts in electric vehicles will leak and cause electric shock accidents? 3) Can they withstand various harsh environments? The operation and use environment of vehicles is very complicated, and they have to withstand high temperatures. The test of high humidity, there are also the torture of the plateau and the cold, there are flat pavements, and there are uneven non-paved roads, both extremely dry areas, and often wading places. In the process of driving, vehicles have to experience high and low temperature cycles, the corrosive coastal climate, heavy rain and flooding, and various shocks, vibrations, drops, and even collisions and rolls. Then, in the face of these objective circumstances, can the power lithium-ion battery system withstand the test without serious safety risks? 4) Can it withstand various abuses? When the product sales are large enough, the use of the product will always exceed It is unpreparable to stipulate limit situations or some unexpected situations. Take a mobile phone as an example. When the charging protection fails, the battery of the mobile phone may catch fire or explode due to overcharging. If the mobile phone battery is punctured by sharp metal, it may explode. So, can the power lithium-ion battery system of electric vehicles withstand similar abuse tests and not cause safety accidents? These abuses are caused by both man-made and objective circumstances. 5) What should I do if the battery management system fails? The power lithium-ion battery system has a complex management and control system that collects various operating parameters of the entire power lithium-ion battery pack at all times for calculation, diagnosis, communication and switch control. The more intelligent the system, the more serious the consequences when it fails. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Briefly describe the use of lithium batteries in the electric vehicle industry