Are lithium-ion batteries really more dangerous than lead-acid batteries?

In terms of battery structure, the current lithium-ion battery packs are basically 18650 batteries for packaging, and lead-acid batteries are basically maintenance-free lead-acid batteries with good sealing performance. If the internal pressure is too large and the safety valve is abnormal If so, the risk factors of the two are basically the same. If the safety valve on the top of the 18650 battery cell is due to the overcharge of the internal hydrogen evolution of the battery, the electrolyte content in the 18650 battery is quite limited, and the amount of hydrogen evolved is also extremely limited, but for the lead-acid battery using dilute sulfuric acid as the electrolyte, if When overcharge occurs, hydrogen evolution inside the battery is serious, and the probability of deflagration is greatly increased. When a certain brand of lithium-ion battery pack is severely damaged, the safety valve is activated to release the pressure, and no fire or explosion occurs. From the perspective of battery safety protection, the safety valve is designed on the 18650 battery cell, which can not only release the excessive internal pressure, but also It physically disconnects the battery from the external circuit, which is equivalent to physically isolating the cell to ensure the safety of other cells in the battery pack. In addition, lithium-ion battery packs are usually equipped with a BMS protection board, which can accurately control the state of each cell in the battery pack and directly solve the problem of overcharge and overdischarge from the root cause. BMS can solve the problem of overcharge and overdischarge of lithium-ion battery cells to the greatest extent. On the contrary, the safety protection of lead-acid batteries seems to be lacking except for the safety valve. BMS protection is almost non-existent, and many inferior chargers cannot even do it. When it is fully charged, the power is cut off, which is far from the lithium-ion battery in terms of safety. Lead-acid batteries lack BMS system protection and equipped with inferior chargers. Of course, if you use a lithium-ion battery whose price is similar to that of lead-acid batteries, no one can save you. Finally, if the battery structure is damaged due to an accidental collision, lead-acid batteries seem to be safer than lithium-ion batteries. However, in this level of accident, the battery material has already been exposed to the open environment, and there is no way to talk about explosion. Batteries are more caused by poor quality products than bomb explosions. 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 it. Previous: Will it be useful to continue to charge the lithium-ion battery after it is fully charged?