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Which is More Practical and Safer, Lithium Batteries or Lead-acid Batteries?

2022-03-10

Some people think that lithium batteries are better than lead-acid batteries. But in fact, lead-acid batteries and lithium batteries do not say which is better than which, because both have advantages and disadvantages, just as different products adapt to different needs of the population. The use of lithium batteries and lead-acid batteries should be judged according to the specific application.

From the perspective of battery safety protection, 18650 cells are designed with a safety valve, not only can release excessive internal pressure, but also physically disconnect the battery from the external circuit, equivalent to the physical isolation of the cell to ensure the safety of other cells in the battery pack. The BMS battery management system of Li-ion battery can provide full protection to the battery, the functions include: charge/discharge high and low temperature protection, single cell overcharge/overdischarge voltage protection, charge/discharge overcurrent protection, cell equalization, short circuit protection, charging reminder, etc.

The electrode of lead-acid battery is composed of lead and its oxide, and the electrolyte is sulfuric acid solution. In the charging state of lead-acid battery, the main component of positive electrode is lead dioxide, and the main component of negative electrode is lead; in the discharging state, the main component of both positive and negative electrode is lead sulfate. Lead-acid battery lacks BMS system protection. Lead-acid batteries seem to lack safety protection except for the safety valve, BMS protection is almost non-existent, and many inferior chargers cannot even achieve complete power failure, so the safety protection is far inferior to lithium batteries. Electric vehicle spontaneous combustion and explosion events occur frequently, most of them are caused by battery charging and discharging, the light damage to the battery, the serious injury, damage to things.

After years of development, lithium batteries and lead-acid batteries are able to fully ensure the safety of users. For customers, the use of lithium batteries or lead-acid batteries should take into account the cost and practical use of the product.

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