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Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .
Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales
Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.
release time:2023-06-08 Hits: Popular:AG11 battery
High temperature test in simulated environment can be conducted by hot box test. The hot box test is to simulate the improper use of the battery under high temperature, such as placing the mobile phone in a sun exposed car, or placing the mobile phone or electronic products in a microwave oven, and the temperature can reach 130 ℃ or even 150 ℃. In case of heat abuse, the heat source is not only from the positive and negative electrode materials inside the battery and their reaction with electrolyte, but also from the positive and negative electrode short circuit caused by melting and shrinking of the isolation film at high temperature. Joule heat generated by short circuit is also an important heat source during hot box test. Table 2 summarizes the thermal behavior of lithium ion battery system in a certain temperature range when the electrolyte system is 1mol/L LiPF6/(PC+EC+DMC).
When the temperature is between 90 ℃ and 120 ℃, the metastable layer of the solid electrolyte interface film (SEI) formed on the surface of the carbon negative electrode by multiple charges and discharges first decomposes and releases heat; With the increase of temperature, the heat absorption of diaphragm melts successively; When the temperature is 180~500 ℃, the positive electrode and the electrolyte have a strong exothermic reaction and produce gas; The SEI film can prevent the interaction between the lithium embedded carbon and the organic electrolyte. When the temperature is higher than 120 ℃, the SEI film breaks and cannot protect the negative electrode. The negative electrode material may start to exothermic react with the solvent and generate gas. When the temperature rises to 240~350 ℃, the fluorine containing binder starts to react with the lithium embedded carbon in a violent chain growth reaction, which releases a lot of heat. The reaction between the negative electrode and the electrolyte may deplete lithium, so this reaction will not occur; If the temperature continues to rise to 660 ℃, the Al collector will undergo endothermic melting. These conditions are very dangerous for large lithium-ion power batteries, affecting the battery life and safety.
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