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How many years can lithium-ion batteries last? Why does deep discharge shorten the lifespan of lithium-ion batteries? Do you know how to use lithium-ion batteries correctly? Even though lithium-ion batteries for electric vehicles can last for 2 to 3 days on a single charge, it is still recommended to charge them every day. Lithium ion batteries should be charged as early as possible after use to keep the battery fully charged. Regular deep discharge of the battery is also beneficial for "activating" the battery, which can slightly increase its capacity. How many years can lithium-ion batteries last? Why does deep discharge shorten the lifespan of lithium-ion batteries?

How many years can lithium-ion batteries last?

The service life of lithium-ion batteries on ordinary electronic products is about 5 to 20 years, with an average of 8 years. However, with the current level of technology, the service life of lithium-ion batteries in electric vehicles is only about 3-5 years. When the battery capacity of an electric vehicle decays below 80% of its initial capacity, the driving range of the electric vehicle will significantly decrease. When the battery capacity decays below 70%, it is necessary to replace the battery. For many current pure electric vehicles, the cost of batteries accounts for about 40% of the total cost of the vehicle.

Many people are conflicted about the lifespan of lithium-ion batteries for electric vehicles, wondering how long a set of lithium-ion batteries can last and why some people's lithium-ion batteries can last for 2-3 years, and even 3-5 years. In fact, the service life of most lithium-ion batteries is designed to be around 1000 cycles, which is 3-4 years. At present, the charging frequency of lithium phosphate ion batteries can reach 2000 times, and the cycle life can reach 7-8 years. They can be fully charged in 60 minutes at a time, which is incomparable to ordinary lead-acid batteries. The price is about twice that of lead-acid batteries with the same capacity.

I believe the vast majority of consumers have heard that the lifespan of lithium-ion batteries is "500 times". After 500 cycles of charging and discharging, the battery will "end its life". Many friends, in order to extend the lifespan of the battery, only charge it when the battery is completely depleted. Is this really a way to extend the lifespan of the battery? The answer is negative. The lifespan of lithium-ion batteries is "500 times", which refers not to the number of charging cycles, but to one charging and discharging cycle.

How to extend the lifespan of lithium-ion batteries

① Timely charging: Because lithium-ion batteries will enter the sulfurization process after discharge, if charged in a timely manner, minor sulfurization can be eliminated. So lithium-ion batteries should be charged as early as possible after use, and the battery should be fully charged as much as possible.

② Cooling and Charging: Do not charge immediately after prolonged use. Instead, wait for the lithium-ion battery to cool down for 10 to 30 minutes before charging to extend its lifespan.

③ Regular inspection: When the capacity of lithium-ion batteries deteriorates, they should be inspected at a local network with lithium-ion battery maintenance and repair technology to determine whether the degradation of lithium-ion batteries is normal. Regular maintenance of lithium-ion batteries is necessary to improve their working condition.

Why does deep discharge shorten the lifespan of lithium-ion batteries?

Lead acid batteries have a memory effect, where they are often recharged with a partial amount of electricity. The memory effect of the battery can cause a partial discharge of electricity and a decrease in battery capacity. Some car enthusiasts may find that the battery life is reduced when they use the photovoltaic battery to fully charge it after forgetting to turn off the lights. However, this behavior is precisely a normal maintenance method for the deep discharge and charging of lead-acid batteries. Based on the current situation provided by car enthusiasts, it appears that car batteries have characteristics similar to lithium-ion batteries, with a sudden decrease in battery life after deep discharge.

Regular deep discharge of lithium-ion batteries is beneficial for "activating" them and can slightly increase their capacity. Regularly perform a complete discharge of the lithium-ion battery, which refers to cycling on a flat road under normal load conditions until the first undervoltage protection. After the first undervoltage protection, the voltage of the lithium-ion battery will continue to rise for a period of time before returning to a non undervoltage state. If the battery is used again at this time, it will cause significant damage to the lithium-ion battery. After completing full discharge, fully charging the lithium-ion battery will feel an increase in its capacity.

The impact of discharge depth on lithium-ion batteries is that the deeper the discharge depth, the easier it is to shorten the lifespan of lithium-ion batteries; Another aspect is the performance on the discharge curve, where the deeper the discharge, the more unstable the voltage and current become. The depth of discharge is closely related to voltage and current, and can be expressed in voltage and used in current. Under the same discharge regime, a lower voltage value indicates a deeper discharge depth.

Frequent use without fully charging will result in a "memory" effect on the battery, affecting its range and reducing its lifespan. Lithium ion batteries are rarely fully charged when purchased, and storing them at full charge for a long time can reduce their capacity. In addition, it is important to choose a high-quality protective plate. Pay attention to these points, your lithium-ion battery can last for five to six years without any problems.

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