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| Explosion of lithium battery pack and explosion-proof |
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| Explosion of lithium battery pack and explosion-proof measures of lithium battery pack the safety of lithium ion battery pack has always been an important problem that bothers the industrialization of lithium battery pack. the explosion accidents of lithium battery pack exposed in recent years are all caused by the use of lithium battery pack without exception. compared with other types of battery pack, this is determined by the special properties of lithium battery material and process. To this end, we should understand the knowledge of lithium battery explosion, we try to explain from the following three aspects. I. What is a lithium battery pack explosion? According to the national standard, the solid matter in any part of the battery group is discharged instantly, and the distance pushed to the lithium battery group more than 25 cm is called explosion. A circular mesh was applied to the experimental cell so that the cell was located at the center of the cell, i.e .25 from either side of the mesh cm, If no solid part of the experiment passes through the mesh, the battery pack is not exploded. The mesh is made of 0.25 mm diameter soft aluminum wire with a density of 6~7/ cm.. How to prevent the explosion of lithium battery pack? All lithium battery explosion is caused by the short circuit caused by the battery heating, and the causes of short circuit are overcharge, over-discharge, positive and negative direct docking, electrolyte leakage and so on. Therefore, in the design of lithium batteries, we can start with the following points: 1. prohibit overcharging of batteries above 4.2 V; 2. prohibit over-loading of batteries below 2.75 V; 3. install explosion-proof valve on metal shell; 4. short circuit during the process. The best way, of course, is to have a battery pack to protect the circuit board design. Although this will increase the cost of lithium battery pack manufacturing, but for the safe use of lithium battery pack is necessary, all regular lithium battery pack manufacturer's products can not avoid this design. 3. Will the polymer lithium battery pack explode? The polymer lithium battery pack is a lithium battery pack product made of soft packaging and polymer electrolytes, and the normal use and storage will not explode unless the human strength damage causes its short circuit. in order to reduce the occurrence of explosion accidents, polymer lithium battery pack is being used in more and more occasions. although the replacement of other types of batteries by lithium battery pack is still in progress, in lithium battery type, polymer lithium battery pack has begun to replace ordinary lithium battery in some fields. |
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