Lithium batteries for pure electric vehicles can be roughly divided into two types: lithium metal batteries and lithium ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable. Then the automobile editor will patiently share his knowledge of lithium batteries with his friends.
Lithium battery knowledge sharing - battery characteristics
Advantages
1. The energy is relatively high. It has a high energy storage density of 460-600 Wh/kg, about 6-7 times that of lead-acid batteries.
2. , using lithium iron phosphate as the positive electrode. The battery is charged and discharged in 1C (100% DOD), with over 10,000 usage records
3. ), approximately equal to three cells of nickel-cadmium or nickel metal hydride. The series voltage of rechargeable batteries makes it easyite the formation of battery power packs; The new lithium battery voltage regulator technology can adjust the voltage of lithium batteries to 3.0V, which is appropriate. for the use of small electrical appliances.
4. It has a high power load capacity. Among them, the lithium-ion iron phosphate battery for electric vehicles can reach a charge and discharge capacity of 15-30°C, which is convenient for starting and high current. acceleration;
5. The self-discharge rate is very low, which is one of the most important advantages of batteries. Most of these can be less than 1%/month, or less than 1/20 of a nickel. -Metal hydride batteries;
6. Lightweight, approximately 1/6-1/5 of lead products of the same volume;
7. adaptability, can be used at -20℃ -60℃ and can be used at -45℃ after treatment
8. Green and environmentally friendlyenvironment, regardless of production, use or disposal, it is essentially a green and environmentally friendly product. does not necessarily contain or cause toxic or harmful heavy metal elements, lead, mercury, cadmium and other substances.
9. The production consumes almost no water, which is very beneficial for water-scarce China.
Specific energy refers to energy per unit of weight or volume. The specific energy is expressed in Wh/kg or WH/L, Wh is the unit of energy, W is the watt, H is the hour; Kg is the kilogram (unit of weight) and L is the liter (unit of volume).
Disadvantages
1. The safety factor of all primary lithium batteries is very low and there is a risk of explosion.
2. Lithium-cobalt oxide lithium-ion batteries cannot be discharged at high currents, are expensive and requiret poor safety factors.
3. Lithium-ion batteries require wiring to prevent overcharging and overdischarging.
4. Production requires high conditions and high costs.
5. The use conditions are limited and it is dangerous to use at high and low temperatures.
Lithium battery knowledge sharing - battery characteristics
High energy density
The weight of lithium-ion batteries is half that of nickel -cadmium or nickel-metal hydride batteries of similar capacities. The volume is 20-30% nickel-cadmium and 35-50% nickel metal hydride.
High voltage
The operating voltage of a single lithium-ion battery is 3.7 V (on average), which is equivalent to three nickel-cadmium or nickel batteries -metal hydride connected in series. .
Pollution-free
Lithium-ion batteries do not containt no harmful metals such as cadmium, lead and mercury. Belongs to the material.
Metal-free lithium
Lithium-ion batteries do not contain metallic lithium and are therefore not subject to restrictions imposed by air transport regulations prohibiting the transport of lithium batteries in passenger planes.
Long lifespan
Generally, the charge and discharge cycles of lithium ion batteries can exceed 500 times, and the charge and discharge cycles of lithium iron phosphate (hereinafter referred to as iron phosphate) can reach 2,000 times.
No memory effect
The memory effect refers to the phenomenon that the capacity of nickel-cadmium batteries is shortened during the charge and discharge cycle. Lithium-ion batteries do not have this effect.
Fast charging
Using a constant current and constant voltage charger with a rated voltage of 4.2V, the bLithium-ion battery can be fully charged in 1.5-2.5 hours. The newly developed lithium iron phosphate battery can be fully charged in 35 minutes.
Lithium batteries for pure electric vehicles have highly active chemical properties of lithium metal, which makes the production, processing, storage and use of lithium metal very demanding on the environment. Above is the lithium battery shared by the automotive editor with his friends. I hope the car shared by the editor can help my friends.
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