Which is safer, lithium battery or lead-acid battery?

Which is safer, lithium or lead-acid? For a long time, the safety of lithium batteries and lead-acid batteries has been the focus of user debate. Some people believe that lithium batteries are safer than lead-acid batteries, while others hold the opposite view. In terms of battery structure, the current lithium battery pack encapsulates 18650 batteries, and lead-acid batteries are basically maintenance-free lead-acid batteries with good sealing performance. The risk coefficients of the two are basically the same. Who is safer, look down! Lithium battery: Lithium battery is a battery with lithium metal or lithium alloy as the negative electrode material and non-aqueous electrolyte solution as the electrolyte. Lithium batteries can be divided into two categories: lithium metal batteries and lithium batteries. Lithium metal batteries were first proposed and discussed by Gilbert. Lewis in 1912. Because the chemical properties of metal lithium are very active, the production, storage, and use of metal lithium have very high environmental requirements. Therefore, lithium batteries are not used for a long time. With the development of science and technology, lithium batteries have become the mainstream. Lead-acid battery: Lead-acid battery (VRLA) is a battery whose electrodes are mainly composed of lead and its oxides, and its electrolyte is a sulfuric acid solution. Under discharge conditions of lead-acid batteries, the important component of the positive electrode is lead dioxide, and the important component of the negative electrode is lead. Under charging conditions, the important component of the positive and negative electrodes is lead sulfate. The nominal voltage of a single-cell lead-acid battery is 2.0V, discharge to 1.5V, and charge to 2.4V. In use, 6 single-grid lead-acid batteries are usually connected in series to form 12V, 24V, 36V, 48V and other nominal lead-acid batteries. Lithium or lead acid, who is safer? From the perspective of battery safety protection, the safety valve is planned for 18650 cells. It can not only release excessive internal pressure, but also disconnect the battery from the external circuit, which is equivalent to the physical separation of cells. , To ensure the safety of other batteries. In addition, the lithium battery pack is usually equipped with a BMS maintenance board, which can accurately control the status of each battery in the battery pack, and directly solve the battery overcharge and overdischarge problems from the source. The electrolyte of the lithium battery pack is a mixed solution of lithium salt and organic solvent, and the commercial lithium salt is lithium hexafluorophosphate. This information is prone to thermal differentiation at high temperatures, and undergoes thermochemical reactions with trace amounts of water and organic solvents, reducing the thermal stability of the electrolyte. The power lithium battery mainly uses lithium iron phosphate. The p-o bond in the lithium iron phosphate crystal is stable and difficult to distinguish. Even in the case of high temperature or overcharge, the same structure will not collapse to generate heat or form strong oxidizing substances, so it has good safety. According to reports, a small number of samples were incinerated in acupuncture or short circuit tests, but there was no explosion. The safety of the lithium battery pack is greatly improved. Spontaneous combustion and explosion of electric vehicles are often attacked. The most important thing is the form of battery charging and discharging. Experts explained that the charging time of lead-acid batteries is too long. After charging, the two poles become a useful material. If you continue to charge, it will attack a large amount of hydrogen and oxygen gas. . When the concentration of this mixed gas is 4% in the air, there is no time to escape. If the exhaust pipe is blocked or there is too much gas, it will burst when encountering an open flame, causing minor injuries to the battery, severe injuries, and damage. In other words, once the lead-acid battery is overcharged, it will increase the possibility of bursting. At present, the lead-acid batteries on the market have not done any overcharge maintenance, which makes the lead-acid batteries in an extremely dangerous state when charging, especially at the end of charging. Finally, lead-acid batteries seem to be safer than lithium batteries if the structure is damaged by accidental resistance. However, in this case, the battery data has been exposed to an open environment, and explosion is impossible. From the above content about the safety hazards of lead-acid batteries and lithium iron phosphate batteries, it can be seen that the biggest safety hazard of lead-acid batteries lies in their constituent data. The electrodes of lead-acid batteries are mainly composed of lead and its oxides, and the electrolyte is a sulfuric acid solution. The stability of these constituent data itself is not very high. If an attack, leakage or explosion occurs, the damage to the lithium battery will be much greater. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Analyze the rated voltage of the battery of the electric sweeper