Lithium-ion batteries and lead-acid batteries are the most commonly used batteries for electric vehicles. With the advancement of electric vehicle battery technology, the development and application of lithium-ion batteries have been increasing year by year. However, it is only an increase; due to limitations in performance and cost-effectiveness, lithium-ion batteries still have a long way to go before they can truly replace the traditional lead-acid battery as the dominant battery.
So, what are the differences between lithium batteries and lead-acid batteries? Let's take a look at the differences between lithium batteries and lead-acid batteries for electric vehicles.
1. Safety Comparison: The safety of power lithium batteries (lithium manganese oxide, lithium iron phosphate) varies depending on the materials used. Lead-acid battery technology is quite mature and is safer than lithium batteries.
2. Environmental Comparison: Lithium batteries are pollution-free, while lead-acid batteries contain the heavy metal lead. Therefore, electric vehicles using lead-acid batteries will still pollute the environment.
3. Price Comparison: The price of lithium batteries of the same capacity is more than double that of lead-acid batteries. This is why electric vehicles using lithium batteries are more expensive.
4. Energy comparison: Lithium batteries have a higher mass ratio, volume ratio, and energy ratio than lead-acid batteries by about 40%.
5. Self-discharge rate comparison: Lithium batteries have a monthly self-discharge of less than 3%, while lead-acid batteries have a self-discharge of 15-30%, which is quite different.
6. Lifespan Comparison: Currently, commonly used lithium iron phosphate batteries can be charged up to 1500 times without any memory effect, retaining approximately 85% of their storage capacity after 1500 charges. Lead-acid batteries, on the other hand, can only be charged around 500 times, with a significant decrease in storage capacity and a pronounced memory effect. Therefore, electric vehicle batteries using lithium batteries have a longer lifespan.
7. Voltage platform comparison: The voltage platform of lithium batteries is greater than 3V, while that of lead-acid batteries is 2V.
8. Comparison of discharge characteristics: Simply put, for batteries of the same capacity, under high current discharge conditions, lithium batteries will release about 30% more electricity than lead-acid batteries.
9. Durability: Lithium batteries are highly durable, have good vibration resistance, are securely fixed when fully charged, consume energy slowly, can withstand over 500 charge-discharge cycles, and have no memory effect. Their lifespan is generally 4-5 years. Lead-acid batteries typically have a lifespan of less than 400 deep charge-discharge cycles, exhibit memory effect, and are around two years old. If using maintenance-free lead-acid batteries, note that they have low water loss and generally do not require the addition of distilled water.
Based on the above comparative analysis of the differences between lithium batteries and lead-acid batteries in electric vehicles, lithium battery models outperform lead-acid models in terms of range, battery life, environmental friendliness, vehicle handling, and charging convenience, while the biggest advantage of lead-acid models lies in their price.
