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Do you, who uses electric vehicles every day, know how long the lifespan of lithium-ion batteries in electric vehicles is? Is the statement that lithium-ion batteries can only be charged and discharged 500 times correct? I believe the vast majority of consumers have heard that the lifespan of lithium batteries is "500 times". After 500 charges and discharges, the battery will "end its life". Many friends, in order to extend the battery's lifespan, charge it every time the battery is completely depleted. Does this really have an effect on extending the battery's lifespan? The answer is negative. The lifespan of a lithium battery is 500 cycles, which refers not to the number of charges, but to one cycle of charging and discharging.

A charging cycle means the process of all the battery's charge going from full to empty, and then from empty to full, which is not equivalent to charging once. For example, a lithium battery only uses half of its capacity on the first day and then charges it slowly. If it continues like this the next day, charging half of it and charging it twice in total, this can only be counted as one charging cycle, not two. Therefore, it may usually take several charges to complete a cycle. Every time a charging cycle is completed, the battery capacity will decrease slightly. However, the magnitude of this low battery capacity is very small. After multiple cycles of charging, high-quality batteries still retain 80% of their original capacity. Many lithium-ion powered products are still used as usual after two or three years. Of course, lithium batteries still need to be replaced at the end of their lifespan. The so-called 500 times refers to the manufacturer achieving about 625 rechargeable times at a constant discharge depth, reaching 500 charging cycles. Due to various impacts in real life, especially the discharge depth during charging is not constant, "500 charging cycles" can only be used as a reference for battery life.

With the gradual announcement of the ban on the sale of fuel vehicles by countries around the world, the new energy industry has once again ushered in a wave of development boom. It is foreseeable that lithium batteries will be widely used in the electric vehicle industry in the future.

Electric vehicle lithium batteries are mainly divided into three categories. The first is ternary lithium, which is currently the most commonly used type of lithium battery. The second is lithium iron phosphate, and the third is lithium titanate. Among them, lithium titanate is widely used and rarely used by people. Currently, Tianneng Superpower and major manufacturers mainly produce ternary lithium batteries. Among them, Tianneng Lithium uses 18650 lithium batteries, while Superpower Lithium mainly uses soft pack ternary lithium, both of which belong to the ternary lithium type, with a voltage of 3.7V and a fully charged voltage of 4.2V.

The three taboos of lithium batteries!

The first temperature, lithium batteries are afraid of high temperatures.

The second largest current, for example, the 18650 battery cell is 3C discharge, and your electric vehicle is 8000W. The battery cell used is lower than the discharge current of your electric vehicle, which can cause the temperature of the lithium battery to be too high, the current to be too large, and the lifespan to be shortened. There may also be situations of bulging and scrapping. If your electric vehicle has a very high power and a very fast speed, it is recommended to choose a 18650 battery cell with a 10C current. Choosing the appropriate battery cell is obviously very important!

The third is full charge storage. The full charge of a ternary lithium battery is 4.35V, and currently, the protection board on the market stops charging at 4.2V. Therefore, many people buy electric vehicle lithium batteries and claim that they do not have the nominal capacity. In fact, this is the reason. Generally, when storing electric vehicle lithium batteries for a long time, it is best to fully charge 50% of the TV. For example, when you buy a new phone, many of them only have 50% of the power when turned on. If fully charged and stored for a long time, it will reduce the capacity of the lithium battery. Except for lithium iron phosphate and lithium titanate, which can be stored at full charge, it is also important to choose a high-quality protective plate. The biggest taboo of lithium batteries is overcharge and over discharge. Ternary lithium is scrapped after one overcharge, and overcharge will inevitably result in bulging and scrapping.

Look at the variety of lithium batteries. The ordinary super power, Tianneng's lithium battery has about 400 cycles, and lead-acid has about 300 cycles. Relatively stable

The customized ternary lithium has 500-600 cycles, which is not very stable and is closely related to the selection of battery cells by the assembler's process

Customized lithium iron phosphate takes approximately 1000 cycles

You fill once a day, use once, count one cycle, fill half, use half, count half a cycle. You can calculate the time you need yourself

Lithium ion battery life for electric vehicles: extended life through "salt bath" method

The Commonwealth Scientific and Industrial Research Organization (CSIRO) in Australia released a research report yesterday stating that its scientists have invented a simpler method to extend the lifespan of rechargeable lithium batteries, which the organization has named "salt baths.".

It is reported that the method was discovered through collaborative research between CSIRO, Royal Melbourne Institute of Technology, and Queensland University of Technology. According to CSIRO researchers, the material they are using is an ionic liquid, also known as room temperature molten salt, which is a unique liquid that is transparent, colorless, odorless, and flame retardant. These materials can form a protective film on the electrode surface to keep the battery stable during use. The process and principle of handling batteries are as follows: before assembling the battery, immerse the lithium metal electrode in a mixed electrolyte containing ionic liquid and lithium salt. After this treatment, not only can the battery life be extended, but also the battery life can be extended, and the performance and safety can be enhanced to a certain extent.

The lifespan of lithium batteries for electric vehicles: the lifespan of lithium batteries

At present, most of the batteries used in electric vehicles that various manufacturers are trying to develop are batteries (mainly lithium-ion batteries) and fuel cells. Fuel cells are not suitable for the current development of electric vehicles due to their high research and maintenance costs (the maintenance cost of fuel cells is about three to four times that of batteries). So for now, let's not mention the commonly used lithium batteries.

The service life of lithium-ion batteries on ordinary electronic products is approximately 5 to 20 years, with an average of 8 years. However, with current technological levels, the service life of lithium-ion batteries on electric vehicles is only about 3 to 5 years. When the battery capacity on an electric vehicle decays to below 80% of its initial capacity, the driving range of the electric vehicle will be significantly reduced. When the battery capacity decays to below 70%, it is necessary to replace the battery. For many current pure electric vehicles, the cost of the battery accounts for about 40% of the total cost of the car, which means that replacing the battery is equivalent to replacing half of the car.

If the electric bike charger is normal, for electric bicycles that travel less than 10km per day, branded new batteries can be supplemented with deionized water as soon as the warranty period expires. If you drive an electric vehicle for 50km every day, you should check the condition of the battery after 8 months, add deionized water appropriately, and add 3-4 ml per grid, especially in summer. Remember to cover the safety valve after adding water. It is recommended to check the electric vehicle that frequently travels with people around six months and maintain it according to its usage.

Many users of electric vehicles have found that the positive electrode battery is prone to lagging behind. Due to the different distribution of capacitance between each battery cell and the vehicle body, the positive electrode battery is the most damaged. While adding water, swap the position of the middle battery and the adjacent one, so that the positive battery takes turns sitting.

When the battery level is above 80%, there is no need to charge. If there is a chance to charge between 30% and 80%, it is necessary to charge. If it is below 30%, it must be charged.

Accelerate smoothly and do not overload. For those with foot pedals, try to manually assist when starting or climbing.

The battery in the battery box should be plugged with paper, and the bottom should be glued with foam double-sided adhesive if possible to avoid battery vibration.

Complete discharge once a month and then charge continuously for 12 hours

When replacing the battery, the parameters of the charger should be regularly checked to ensure that the battery matches the charger.

Once you find it difficult to turn the green light on the charger, or if it turns green immediately upon charging, or if the battery temperature rises abnormally during charging, you should immediately check whether it is a problem with the charger or the battery.

For ordinary chargers without temperature compensation, in summer, a 6A10 diode is connected in series between the charger and the battery, and two 6A10 diodes are connected in series for colloidal batteries; Short circuit diodes in other seasons.

Maintain good mechanical and technical condition of the vehicle, sufficient tire pressure, good lubrication, and normal brake clearance and tightness.

By implementing the above 10 measures, lithium batteries can significantly extend their service life.

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