At present, Xiao Bian insists that it is very important to understand the power lithium battery to choose electric vehicles. Today Xiaobian teaches you five steps to analyze the safety of electric vehicles. This article refers to the address: http:// The first bomb: first look at the three-dimensional structure of the electric car In this picture, it is clear that the battery is distributed on the chassis of the car. Tesla electric car chassis 2nd bomb: Make sure the battery is distributed on the chassis, but not a battery, but a lot of battery strings. Take the cylindrical lithium battery as an example, the truth on the above picture. The series connection of the batteries requires extremely good consistency, that is, the capacity of each section must be the same. Otherwise, when charging, one is not full, one is overcharged, and the danger is very large. If you use fast charge instead of slow charge at this time, the energy is input into the closed space in an instant, and the risk factor is magnified many times. Xiaobian strongly recommends that the riders give priority to slow charging, one is safety, and the other is good for battery life. The third bomb: the cause of thermal runaway As a high-energy carrier, the safety of the power battery comes from its energy release, including the release of electrical energy and the release of chemical energy. The safety problem caused by chemical energy release is ultimately manifested by combustion or explosion caused by thermal runaway and thermal runaway expansion. Episode 4: Reaction from heat abuse to thermal runaway 5th bomb: 7 stages of the thermal runaway process (visual inspection is within 2 seconds) Thermal runaway phase, irreversible and uncontrollable Based on the above analysis, in order to maintain the safety of electric vehicles, power battery manufacturers and users shoulder important responsibilities. 1. User: Drive carefully and avoid collision. Observe the road surface to avoid the bottom battery being squeezed or puncture. When charging, you must strictly abide by the requirements. If you can charge slowly, you should not choose fast charging. Do not overcharge or over discharge. 2, power battery suppliers: improve the consistency of battery cells; BMS can respond and control the danger in a timely manner.
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