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How many years can the real lifespan of electric vehicle lithium iron phosphate batteries be used? Many friends say that electric vehicle lithium iron phosphate batteries will experience decay after 5 years of use, is that true? For new energy vehicles, battery life is mainly divided into two types: cycle life and service life. The cycle life of lithium iron phosphate batteries can reach over 2000 times, but we still calculate the cycle life at 80%, which is 1600 times.

What is a lithium iron phosphate battery?

Lithium iron phosphate battery is a type of lithium-ion battery that uses lithium iron phosphate as the positive electrode material. The characteristics are strong safety and stability, high temperature resistance, and good cycling performance. Like ternary lithium batteries, lithium iron phosphate batteries have a theoretical lifespan of over 2000 charge and discharge cycles, even if charged once a day, they can last for over five years. Generally speaking, for daily household use, it can be recharged every three days and can also be used for about eight years. However, due to the poor low-temperature performance of lithium iron phosphate batteries, their lifespan will be relatively longer in southern regions.

The advantages of lithium iron phosphate batteries

1. The energy ratio is relatively high. Lithium iron phosphate batteries have a high storage density, reaching 460-600Wh/kg, which is about 6-7 times that of lead-acid batteries;

2. With a long service life, the lithium iron phosphate battery pack can reach a service life of over 6 years;

3. The additional voltage is high (the individual working voltage is 3.7V3.2V), which is approximately equal to the series voltage of three nickel cadmium or nickel hydrogen rechargeable batteries, making it easy to form a battery power pack;

4. It has high power acceptance, among which the lithium iron phosphate battery used in electric cars can reach the ability to charge and discharge at 15-30C, facilitating high-intensity start-up acceleration;

5. Low self discharge rate, which is one of the most outstanding advantages of this battery. It can now reach below 1% per month, much lower than 25-30% of Ni Cd and 30-35% of Ni and MH;

6. Lightweight, the weight of lithium iron phosphate batteries is about 1/5-1/6 of that of lead-acid battery products under the same volume;

7. The applicability of upper and lower temperatures is strong, and it can be used at -20 ° C-60 ° C. Through process disposal, it can be used in an environment of -45 ° C.

How many years can the real lifespan of electric vehicle lithium iron phosphate batteries be used?

Lithium iron phosphate batteries have an ultra long service life, with a single battery capable of 100% deep cycling up to 5000 times. The theoretical service life can reach up to 10 years, and the designed annual production capacity is 20000 KWH. Lithium iron phosphate batteries can be charged and discharged more than 3000 times, which is much better in terms of lifespan than ternary lithium batteries.

BYD Tang, like Qin, uses lithium iron phosphate batteries, but Qin's battery capacity is 13 kilowatt hours, while Tang's battery capacity has been increased to 18 kilowatt hours, with a pure electric range of 85 kilometers. Lithium iron phosphate power battery, with a cycle life of over 2000 times, can be charged at a standard rate of 5 hours and used up to 2000 times. A lead-acid battery of the same quality can last for six months, including new and old ones, and maintenance and upkeep, with a maximum lifespan of 1-1.5 years. However, when used under the same conditions, lithium iron phosphate batteries have a theoretical lifespan of 7-8 years. Overall, the cost performance ratio is more than 4 times that of lead-acid batteries in theory.

Although the official statement on the battery life of BYD Tang electric vehicles is not clear, from the perspective of the performance of lithium iron phosphate batteries, 7-8 years of battery use should not be a problem. However, the issue of increased battery loss caused by the increase in charging frequency is another major selling point that attracts consumers' attention, whether the manufacturer can provide after-sales service projects such as battery repurchase.

The theoretical cycle life of ternary lithium batteries is about 1500 times. In practical use, the complete charge discharge cycle is more than 800 times. However, when the battery discharge is controlled between 25% -75%, the actual use can reach more than 1200 times. Based on a typical ternary lithium battery electric vehicle with a range of 200 kilometers, it can actually travel 180 kilometers per complete cycle, and 144000 kilometers per 800 cycles. Even with normal attenuation, there is no pressure to travel 120000 kilometers.

The charging and discharging cycle life of lithium iron phosphate batteries can generally reach over 2000 times. Even for vehicles with a range of only 70 kilometers, 2000 cycles can support pure electric driving of 140000 kilometers. The only drawback is low energy density and significant low-temperature attenuation. The capacity will decrease by about 10% at 0 ℃, and about 30% at -20 ℃.

Summary: With the development of the industry and the gradual maturity of lithium iron phosphate battery technology, the service life of the battery will become longer, and the replacement price will become lower. For household vehicles, the rated cycle life of ternary lithium batteries and lithium iron phosphate batteries far exceeds the actual usage habits of users, and also exceeds the average replacement cycle of Chinese consumers. Therefore, the service life can be completely assured.

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