Battery is the heart of electric vehicle, choose cost-effective battery, learn to use the battery correctly, not only can prolong the battery life, reduce the cost of the car, but also can reduce the lithium battery combustion and explosion of the threat to life, so that electric vehicle better serve our life. After reading the article, you will know how to buy electric car batteries.

There are lead-acid batteries and lithium batteries on the market today. Lead-acid batteries are divided into ordinary lead-acid batteries, black gold batteries, graphene batteries. Lithium battery is divided into lithium iron phosphate battery, lithium manganese acid battery and ternary polymerization physical battery. What kind of battery should you choose to buy an electric car? Let's explore this question.

First introduce the advantages and disadvantages of lithium battery, lead acid battery advantages and disadvantages, make a comparison to know how to choose. Finally, this section describes the safety precautions of the two batteries.

Introduction to lead-acid batteries

Lead-acid battery electrode is mainly made of lead and its oxide, electrolyte is sulfuric acid solution battery. A single cell lead-acid battery has a nominal voltage of 2.0V, can be charged to 2.4V, and can be discharged to 1.5V. In application, 6 single-cell lead-acid batteries are often connected in series to form a nominal 12V lead-acid battery.

Advantages of lead-acid battery: cheap, recyclable, mature technology, safe use.

The disadvantages of lead-acid battery: large volume, heavy weight, low temperature resistance performance is poor, short mileage, short service life.

Introduction to lithium battery

Lithium battery is a kind of battery with lithium metal or lithium alloy as positive/negative electrode material and using non-aqueous electrolyte solution.

Advantages of lithium battery: small size, light weight, large capacity, long cycle life.

Disadvantages of lithium battery: lithium dendrites will inevitably be produced in the process of use, and even break through the safety diaphragm when serious, easy to short-circuit fire. In addition, lithium batteries sell at a high price and have low recycling value.

Buying an electric car should choose lead-acid battery or lithium battery?

The following will be from the lead acid battery and lithium battery mileage, low temperature resistance performance, service life, the use of safety of these aspects to make a comparison.

Let's take a best-selling brand of electric vehicles on the market as an example. The same model of electric vehicles respectively use lead-acid batteries and lithium batteries.

1 Driving range

Under normal conditions, 60V 20 A lead-acid battery, keep a moderate speed in summer, battery range of about 70 kilometers. Using 60V20 Ann lithium battery, the mileage is about 90~100 kilometers.

2. Low temperature resistance

Winter lead-acid battery low temperature resistance performance is poor, the capacity is summer 2/3, the battery can travel 70 kilometers in summer, winter mileage is less than 50 kilometers. The capacity of lithium batteries can also be affected by cold temperatures in winter, but the impact is relatively small. Lithium batteries can travel about 100 kilometers in summer and 85 kilometers in winter.

3. Service life

Take the best lead-acid graphene batteries on the market for example, which have a service life of about three to four years. The average service life of lithium batteries is three to five years.

4. Use safety

Lead-acid battery technology is mature and has passed the test of the market. The main materials of the battery, lead and electrolyte, have stable physical properties and will not burst into flames. And all of the accidents that we've seen where electric cars have caught fire and exploded and killed people have been caused by lithium batteries.

Lithium is a kind of metal with active chemical elements. If it is used improperly, it will be dangerous. For example, the heat dissipation of the battery will be affected during charging, the internal temperature of the battery will rise, or the short circuit will occur in the process of use. Now the new national standard electric vehicles use lightweight lithium batteries, the body uses thin-wall steel pipe welding, weak body strength, light weight, poor driving safety.

Through the above comparison, it is concluded that the use of lead-acid battery to buy electric vehicles is more cost-effective, not only can reduce the cost of the car, the most important is that the safety performance is much higher than lithium batteries, will not burst into flames. However, if you have a high battery life requirement for electric vehicles, such as delivering food and express delivery, it is recommended to use lithium iron phosphate batteries of big brands on the market.

Lead-acid battery technology is mature, cheap, old batteries can be exchanged for new, effectively reduce the cost of car. From the perspective of safety, the plate of lead-acid battery is lead, the electrolyte is sulfuric acid, lead and sulfuric acid are relatively stable substances, even if overfilled bag will not cause fire. So in general, buying an electric car is of course safer to use lead-acid batteries.