Lithium battery life of electric vehicle is several years

For using electric car every day, you may know the life span of electric car lithium battery probably. Lithium ion battery can only charge and discharge 500 times, right? Believe that the vast majority of consumers have heard of, the life of the lithium battery is "500", 500 times more than the number of times, the battery will "die", many friends in order to be able to extend battery life, each time to charge when the battery run out completely, so really have a longer effect on battery life? The answer is no. Lithium battery life is "500 times", refers to the number of times, but a charge and discharge cycle.

A charging cycle means that all the battery's energy is used from full to empty, and then from empty to full, which is not the same as charging once. A lithium battery, for example, USES half its energy on the first day, and then charges it slowly. If this is still the case the next day, you can use half of the charge, and the total two charges down, this can only count as one charging cycle, rather than two. As a result, it usually takes several charges to complete a cycle. The battery capacity decreases a little with each charging cycle. However, this is a very small amount of power. After many cycles of charging, high-quality batteries still retain 80% of their original capacity, and many lithium-powered products are still in use after two or three years. Of course, lithium battery life will eventually need to be replaced. The so-called 500 times, refers to the manufacturer in a constant discharge depth of 625 times or so can be charged times, reached 500 charging cycle. Due to various influences in real life, especially the discharge depth during charging is not constant, so "500 charging cycles" can only be used as a reference battery life.

The new energy industry is once again enjoying a boom in development, as the global timetable for banning the sale of fuel oil vehicles has been announced. It is foreseeable that lithium battery will be widely used in electric vehicle industry in the future.

Electric vehicle lithium battery is mainly divided into three categories, the first three lithium, is currently the most used lithium battery, lithium iron phosphate second, lithium titanate third, lithium titanate popularity is very low, few people use. The first is now the day can exceed the power and major manufacturers are basically three lithium cells, including the day can lithium battery is 18650 lithium battery, super power lithium battery is mainly soft package lithium three, all belong to the three lithium type, 3.7v, 4.2v full charge.

Lithium battery three taboos!

The first temperature, lithium battery is afraid of high temperature.

Second big electric current, such as 18650 batteries is 3 c discharge, electric cars is 8000 w, you use the batteries is lower than your electric discharge current, it will lead to lithium battery temperature is too high, excessive current and short service life, still can appear beat scrap, if your electric power is very big, very fast, advised to choose a 10 c current 18650 batteries, so choose the right batteries obviously is very important!

The third is full of electricity storage, ternary lithium electricity electricity is 4.35 V, full protection board is currently on the market by charging 4.2 V, so a lot of people buy electric lithium battery all say no nominal capacity is much, in fact, it is for this reason, generally long time storage electric lithium battery, with less than 50 best TV, such as you buy a new phone, many of them are up fifty percent of the electricity. If full power storage time is long, lithium battery capacity will be reduced. Except lithium iron phosphate and lithium titanate, these two can be fully charged storage, but also need to pay attention to the choice of better quality protection plate, lithium battery is the biggest taboo is overcharge and over discharge, ternary lithium once over discharge is scrapped, overcharge must be scrapped.

Look at the lithium battery variety. Ordinary super power, day energy lithium battery about 400 cycles, lead acid is about 300. Relatively stable

Customized lithium ternary is 500 to 600 cycles, which is not very stable, and the assembly of the process of the selection of the cell has a lot to do with

Customized lithium iron phosphate has about 1,000 cycles

You fill it up once a day, use it up once, count one cycle, fill it up half, use it up half, count half a cycle. Count the time it takes you

Lithium battery life of electric vehicle: "salt bath" way to extend the life

Scientists at Australia's federal scientific and industrial research organization (CSIRO) have developed a simpler way to extend the life of rechargeable lithium batteries in what it has dubbed a "salt bath", according to a study published yesterday.

The method was discovered by CSIRO in collaboration with the royal Melbourne institute of technology and Queensland University of technology. According to the CSIRO researchers, the material they used is an ionic liquid, also known as room temperature molten salt, which is a transparent, colorless, odorless and flame retardant unique liquid that forms a protective film on the surface of the electrode to keep the battery stable during use. The process and principle of battery treatment is that before battery assembly, lithium metal electrode is immersed in mixed electrolyte containing ionic liquid and lithium salt. After such treatment, not only the battery life can be prolonged, but also the battery life can be extended, and the performance and safety can be enhanced to a certain extent.

Lithium battery life of electric vehicle: the life of lithium battery

At the present stage, the batteries carried by electric vehicles attempted by various manufacturers are mainly batteries (mainly lithium-ion batteries) and fuel cells. Due to the high research and development cost and maintenance cost of fuel cells (the maintenance cost of fuel cells is about three to four times that of batteries), fuel cells are not suitable for the development of electric vehicles at this stage. So let's leave aside the lithium batteries that are commonly used today.

Lithium ion battery life of ordinary electronic products is about 5 to 20 years, the average is 8 years, but with the current level of technology, lithium ion battery life in electric vehicles is only about 3 to 5 years. When the battery capacity of the electric vehicle decays below 80% of the initial capacity, the driving range of the electric vehicle will be significantly reduced. When the battery capacity decays below 70%, the battery must be replaced. For many of today's pure electric vehicles, the cost of the battery accounts for about 40% of the total cost of the vehicle, which means that replacing the battery is equivalent to replacing less than half a car.

If the electric car charger is normal and the electric bicycle driving less than 10km every day, the new battery of the famous brand can be appropriately supplemented with deionized water when the warranty expires. That every day to drive 50km of electric vehicles, after 8 months should check the battery condition, appropriate supplement of deionized water, each grid supplement 3 ~ 4ml, especially in the summer, after adding water must remember to cover the safety valve. That often takes the electric car of the person, proposal half a year or so should check, will undertake maintenance according to the circumstance that USES.

Many users of electric vehicles find that the battery at the positive pole tends to lag behind. The battery at the positive pole suffers the most damage due to the different capacitance distribution between the battery monomer and the vehicle body. At the same time in the water and the middle of the battery and the position of the side, so that the positive pole of the battery in turn "sit".

Electric quantity shows when 80% above need not charge, in 30% ~ 80% have an opportunity to charge, must charge below 30%.

Acceleration should be gentle, not overload. If there is a pedal device, try to move it manually when starting or climbing.

The battery inside the battery box should be tightly packed with paper, and the bottom should be glued with foam double-sided adhesive tape if possible to avoid battery vibration.

Complete discharge is carried out once a month, followed by continuous charging for 12h.

Always check the charger parameters when changing the battery to keep the battery matching the charger.

Once it is found that it is difficult for the charger to turn the green light or turn the green light as soon as it is charged, and the battery temperature rise is abnormal when it is charged, it should immediately check whether it is the charger problem or the battery problem.

In common chargers without temperature compensation, a 6A10 diode is connected in series between the charger and the battery in summer, and two 6A10 diodes are connected in series between the colloid battery and the charger. 

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

Do the above 10 measures, lithium battery can be doubled to extend the service life.