About electric car batteries

We are in the purchase of electric vehicles, must be very concerned about the battery, because the battery is the core of electric vehicles, directly affects the vehicle's range, so the battery requirements will be relatively high. Do you know everything about electric car batteries?

Battery classification and comparison

The most common electric vehicle batteries on the market are lead-acid batteries and lithium batteries. What is the difference between them?

Lead-acid battery is cheap, has the advantages of recovery and reverse repair, and high recycling utilization rate; Secondly, "fighting" ability is strong, hard and resistant to falling, and the loss rate is low; Summed up, lead-acid batteries are more cost-effective. In addition, lead-acid batteries have higher sealing, better safety performance. But it has large volume but small capacity, short service life, generally deep charge and deep discharge in 400 times or so.

Lithium battery, light weight, small size, compared with the same capacity of lead acid battery, its volume is 2/3 of the volume of lead acid battery, weight is about 1/3 of the weight of lead acid battery. The weight reduction increases the range of electric vehicles by about 10%. Second, lithium batteries have a long life span, 1.5 times longer than lead-acid batteries. However, high production requirements and high costs lead to high prices and non-recyclable lithium batteries. In addition, improper operation may have security risks.

The battery specification

We generally use the combination of battery voltage and capacity to express the battery specifications of electric vehicles, such as 48V20Ah. Here "V" is the unit of voltage and "Ah" is the unit of capacity. Generally, a single battery is 12V, so 48V20Ah represents a battery pack consisting of four 20Ah batteries in series.

Battery specifications directly affect the battery life of electric vehicles, under the same circumstances, 60V20Ah battery than 48V20Ah battery life, this is obvious. So in the case of battery voltage has been determined, let's discuss the impact of battery capacity on battery life.

Battery capacity

Battery capacity refers to the size of battery storage, is one of the important indicators to measure battery performance, but also an important factor affecting the electric vehicle's endurance, ignore other factors, the larger the battery capacity, the longer the electric vehicle's endurance, so how to improve the battery capacity?

To understand this, we can look at it this way: battery capacity = energy density X battery volume. Therefore, it is necessary to improve battery capacity from two aspects of battery volume and energy density. Because the mass size of the vehicle is limited, the volume of the battery will not change too much, so improving the energy density is the core method to improve the capacity of the battery, and there are many factors affecting the energy density, such as the number of anode and cathode materials, electrolyte and so on.

Luyuan's high energy battery improves the capacity of the battery by two means: one is to effectively use the original internal space of the battery, increase the number of anode and cathode materials and electrolyte, and increase the space utilization rate from 95% to 100%; The second is to increase the amount of lead material in the battery, and increase the proportion of electrolyte year-on-year, so that its capacity increases year-on-year. So the range increased by more than 10%. I want you to run 20 miles! At the same time, battery performance has improved, mainly in the cycle life.