3.7 volt battery 18650

　　Are 3.7 volt battery 18650 safer than lead-acid batteries?

　　The safety of lithium and lead-acid batteries has been controversial among users, with some saying that 3.7 volt battery 18650 are safer than lead-acid batteries, while others believe the opposite. In terms of battery structure, the current lithium battery pack is basically a packaged 18650 battery, and the lead-acid battery is basically a maintenance-free lead-acid battery with good sealing performance. A safer person, just look down and you'll know it!

　　lithium battery:

　　Lithium battery is a battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte. 3.7 volt battery 18650 can be broadly divided into two categories: lithium metal batteries and lithium-ion batteries. In 1912, Gilbert N. Lewis proposed and studied lithium metal batteries. Since lithium metal has very good chemical activity, the environmental requirements for the processing, storage and use of lithium metal are very high. Therefore, the lithium battery has not been used for a long time. With the development of science and technology, 3.7 volt battery 18650 have become mainstream.

　　Lead-acid batteries:

　　Lead-acid battery (VRLA) is a battery whose electrodes are mainly made of lead and its oxides, and its electrolyte is sulfuric acid solution. In the discharged state of a lead-acid battery, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead. In the charged state, the main components of the positive and negative electrodes are lead sulfate.

　　 The nominal voltage of a single-cell lead-acid battery can be discharged at a voltage of 1.5V to 2.0V and charged to 2.4V. In applications, six single-cell lead-acid batteries are usually used in series to form a 12-volt lead-acid battery, as well as 24V, 36V and 48V.

　　Who is safer than 3.7 volt battery 18650 or lead-acid batteries?

　　In terms of battery safety protection, the safety valve is designed for 18650 batteries, which not only releases excess internal pressure, but also physically isolates the battery from external circuits. This is equivalent to physically isolating the cells to isolate the safety of other cells in the battery pack. In addition, lithium battery packs are usually equipped with a BMS protection board, which can accurately control the status of each battery pack in the battery pack, and you can solve the problems of overcharging and over-discharging by yourself.

　　Lithium battery BMS battery management system can provide comprehensive protection for the battery. Its functions include: charge and discharge hot and cold protection; single cell overcharge/over-discharge voltage protection; charge/discharge overcurrent protection; battery balance; short circuit protection; notification, etc.

　　The electrolyte of lithium battery pack is a mixed solution of commercially available lithium salt and lithium hexafluorophosphate lithium salt and organic solvent. They are easy to pyrolyze at high temperatures and are reduced through thermochemical reactions with trace amounts of water and organic solvents.

　　Power 3.7 volt battery 18650 mainly use lithium iron phosphate. The PO bond of lithium iron phosphate crystal is stable and not easy to decompose, but it does not generate heat even under high temperature or overcharge, and does not form strong oxidizing substances (such as lithium cobalt oxide). Good security. In actual surgery, a small amount of samples were found to burn during acupuncture or short-circuit experiments, but no explosion occurred. The safety of lithium battery packs has been greatly improved. In contrast, lead-acid batteries lack the protection of a BMS system. Lead-acid batteries appear to lack safety protection except for safety valves, and BMS protection is virtually non-existent. In good condition for use with a low quality charger.

　　  Electric vehicles often undergo spontaneous combustion and explosions, and the most common cause is battery charging and discharge. Some experts say that the charging time of lead-acid batteries is too long, and they continue to charge even after the poles are converted into effective substances. If they are charged to the end, a large amount of hydrogen and oxygen will continue to charge. If the concentration of this mixed gas accounts for 4% of the air, it is too late. If the vent is blocked or has too much gas, it may explode if struck by flame, which may damage the battery and cause harm or serious injury. In other words, if a lead-acid battery is overcharged, it has a greater chance of exploding. Lead-acid batteries currently on the market do not perform an "overcharge protection" function, which makes lead-acid batteries very dangerous during the charging process, especially at the end of the charge.

　　Finally, lead batteries appear to be safer than 3.7 volt battery 18650 if the battery structure is damaged by an accidental collision. But at this accident level, the battery materials have been exposed to the open air and are not explosive.

　　From the above safety risks of lead-acid batteries and lithium iron phosphate batteries, it can be seen that the biggest safety risk of lead batteries lies in the constituent materials. The electrodes of lead-acid batteries are mainly made of lead and its oxides, and the electrolyte is a sulfuric acid solution. These components are not very stable and can cause more damage than 3.7 volt battery 18650 if they leak or explode.

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