Is a lithium battery really more dangerous than a lead acid battery? But in fact, it’s not! Which of the lithium batteries and lead-acid batteries is safer because of the understanding of the battery and the explosion in some cases?
In terms of battery structure, the current lithium battery pack is basically packaged in 18650 batteries, and the lead-acid battery is basically a maintenance-free lead-acid battery with good sealing performance. If the internal pressure is too large and the safety valve is abnormal, the risk factors for both are basically the same.
If the battery is overcharged and internally hydrogenated, the electrolyte content of the 18650 battery is very limited and the amount of hydrogen evolved is very limited. However, for a lead-acid battery using dilute sulfuric acid as an electrolyte, if overcharge occurs, internal hydrogen evolution of the battery occurs. This phenomenon is very serious and the possibility of deflagration is greatly increased.
From a battery safety point of view, the 18650 battery is designed with a safety valve that not only relieves excessive internal pressure, but also physically disconnects the battery from external circuitry, which is equivalent to physically blocking the battery to ensure battery pair Other batteries are safe.
In addition, the lithium battery pack is usually equipped with a BMS protection board, which can accurately control the state of each battery in the battery pack and directly solve the problem of root overcharge and discharge.
In contrast, lead-acid batteries appear to lack safety protection in addition to safety valves. BMS protection is almost non-existent, and many inferior chargers cannot even fully charge and power down. Safety guarantees are far from lithium batteries.
Of course, if you use a lithium battery that is similar in price to a lead-acid battery, no one can save you in this situation.
Last but not least, if the battery structure is damaged by an accidental collision, the lead-acid battery seems to be safer than the lithium battery. However, in this type of accident, the battery material is exposed to an open environment for a long time and the explosion is not discussed.
The battery is not a bomb. The explosion is caused more by inferior products. From the perspective of battery safety redundancy design, qualified lithium batteries and lead-acid batteries can fully guarantee the safety of users without obvious safety differences. However, due to the large number of low-end small electric vehicles and scooters on the market, and most of them are poor quality lithium batteries, they are relatively more prone to accidents, which makes consumers have the illusion that lithium batteries are unsafe.