Which is safer, polymer battery or 18650 battery?

Polymer battery or 18650 battery, which is safe? Polymer battery or 18650 battery is safe. 1.18650 battery safety measures analysis Positive explosion-proof aluminum foil, fuse insurance, pressure insurance, negative explosion-proof particles of power lithium battery. When the pressure is high: the explosion-proof aluminum foil protrudes and the top fuse is blown. When the pressure is high: the explosion-proof aluminum foil breaks and the pressure is released. The thickness of the explosion-proof aluminum foil is much thinner than that of the polymer packaging aluminum foil, and the breaking pressure is smaller than that of the polymer packaging aluminum foil. Short circuit overcurrent: circuit breaker insurance. When overheating: circuit breaker. Over-discharge: The explosion-proof aluminum foil is protruding, the top fuse is blown, and the battery cannot be charged at 0V. 2. Analysis of safety measures for polymer batteries. The overall aluminum-plastic packaging is rarely provided with bimetal or PTC insurance. When the pressure is high: the belly is swollen, but it can still be used. When the pressure is high: the package breaks and releases a lot of gas (because it is already round and full). Short circuit overcurrent: Actions with insurance are insured, and no insurance may cause fire. Overheating: An act that has insurance but no insurance may cause a fire. Excessive discharge: The abdomen swells, and charging can easily cause the package to rupture and explode. 3. Overview of the safety analysis of polymer batteries and 18650 batteries It seems that the 18650 lithium-ion battery pack is almost as safe as the polymer, and the 18650 is a little better than the polymer. On the contrary, the principle of the 18650 frequent explosion is that the button-shaped valve cover covered the pressure relief valve in the past, rust or dirt stuck, unable to release the pressure. That is, the old 18650 outputs 0V after safe trip, and the pressure reducing valve can be reset with a pin to restore the output. The new 18650 I removed is made of aluminum foil or a similar diaphragm. It is easily punctured by a needle and cannot be repaired with the previous method. The insurance is also one-time, and high-voltage breakdown or over-current burns cannot be recovered. Through the safety analysis of polymer batteries and 18650 batteries, it is found that explosion does not mean burning. Both the 18650 and the polymer pressure reducer are highly flammable, with a rotten apple smell of electrolyte. The owner himself tested that they are almost as flammable as alcohol, except for electrolytes and black smoke. Many of the explosions in 18650 were actually just burning. The probability of burning accident of 18650 is basically the same as that of polymer, which can be effectively prevented by a good protection circuit and charging circuit. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the requirements for charging lithium-ion batteries?