Comparative analysis of lithium batteries and lead-acid batteries.18650 lithium rechargeable battery

　　At present, there are various battery brands, styles, and brands selling electric vehicles, with lead-acid batteries and lithium batteries occupying the dominant position. Below, I will compare and clarify the relationship and differences between the two.

　　Usually, lead-acid battery packs weigh between 16 and 30 kilograms and have a larger volume; Lithium batteries generally weigh between 2.5 and 3.0 kilograms and have a relatively small volume, making them light to ride and convenient to transport. From a quality perspective, it is difficult to determine the quality of the two, but consumers can purchase high-quality batteries produced by legitimate manufacturers according to their actual needs.

　　The cost of main materials such as positive electrode materials, negative electrode materials, current collectors, separators, electrolytes, etc. for lithium batteries is much higher than that of lead-acid batteries. The cost of assembly accessories and external circuit systems for lead-acid batteries is extremely low.

　　Due to the manufacturing process, the labor cost of lithium batteries is relatively high. In the manufacturing cost, the labor cost of lithium batteries accounts for over 40%, while the labor cost of lead-acid batteries is generally 10% to 20%.

　　The mechanical equipment used in the production of lithium batteries is expensive and of high value, resulting in significant depreciation losses. Lithium batteries are mostly irreversible in production, while lead-acid batteries are reversible for repair and reuse. The recycling value of lead-acid batteries after use is over 40%, while the recycling value of lithium batteries is almost zero.

　　Lithium batteries, whether in terms of volume to energy or weight to energy, are more than three times higher than lead-acid batteries. Lithium batteries are smaller in size and lighter in weight. Long cycle life. The cycle life of lithium batteries used in electric vehicles is generally over 800 cycles, and lithium batteries using lithium iron phosphate cathode materials can reach about 2000 cycles, which is 1.5 to 5 times longer than lead-acid batteries. This greatly reduces the cost of using lithium batteries, prolongs their lifespan, and improves their convenience of use. Has a wide range of charging efficiency. This is a unique advantage of lithium batteries. When needed, the charging time can be controlled between 20min and 1h, and the charging efficiency can reach over 84%. On the basis of further technological innovation, this feature will be better utilized.

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