Safety Hazards IN The Storage Process OF Lithium Batteries Energy Storage.

The safety of lithium battery storage has always been a consideration for lithium battery enclosure suppliers. There will be many safety problems during the storage process. Let's take a look at these problems.

Generally speaking, the safety problems of lithium-ion battery packs are manifested as burning or even explosion. The root cause of these problems is the thermal runaway inside the battery. In addition, some external factors, such as overcharge, fire source, extrusion, puncture, Issues such as short circuits can also lead to safety concerns.

• Potential safety hazards of cathode materials

When the lithium-ion battery pack is used improperly, the internal temperature of the battery will rise, which will cause the decomposition of the active material and the oxidation of the electrolyte in the positive electrode material. At the same time, these two reactions can generate a lot of heat, which causes a further rise in the battery temperature. Different delithiation states have very different effects on the lattice transformation of active materials, decomposition temperature and thermal stability of batteries. Therefore, the Li power enclosure needs to have strong heat dissipation performance.

• The safety hazard of negative electrode materials

The negative electrode material used in the early days was metal lithium, and the assembled battery was prone to lithium dendrites after repeated charging and discharging, which in turn pierced the diaphragm, resulting in short circuit, leakage and even explosion of the battery. The lithium intercalation compound can effectively prevent the appearance of lithium dendrites and greatly improve the safety of lithium ion batteries. As the temperature increases, the carbon anode in the lithium intercalation state first undergoes an exothermic reaction with the electrolyte. Under the same charge-discharge conditions, the exothermic rate of the reaction between the electrolyte and lithium-intercalated artificial graphite is much greater than that of the reaction with lithium-intercalated mesocarbon microspheres, carbon fibers, coke, etc.

• Safety hazard of diaphragm and electrolyte

The electrolyte of lithium ion battery is a mixed solution of lithium salt and organic solvent, of which the commercial lithium salt is lithium hexafluorophosphate. Thermal stability of the electrolyte. The organic solvent of the electrolyte is carbonate, which has a low boiling point and flash point. It is easy to react with lithium salt to release PF5 at high temperature, and it is easy to be oxidized.

Therefore, the storage of lithium batteries requires good safety precautions. If a large number of lithium battery storage warehouses do not have good safety precautions, huge losses will be caused. However, YONGUCase has made some solutions in this area and has experience in solving 4U lithium battery chassis.

The protection of the lithium battery energy shell plays an important role in the stability of the lithium battery. Regarding how to design a lithium battery enclosure, please read the next article: What Key Points Should Be Paid Attention To In The Process Of Designing A Lithium Battery Enclosure?