18650 power lithium battery can discharge at a higher rate.
Take power lithium batteries made of lithium iron phosphate and ordinary lithium batteries as examples. Although the overall systems and material structures of positive and negative electrodes are the same, the positive and negative electrodes of power lithium batteries are material particles. are smaller than the ordinary type (increasing the surface area and speeding up the chemical reaction rate). The separator material and electrolyte used have better conductivity. In addition, there are more power tabs drawn from the positive and negative electrodes than the ordinary type (. Reduce the internal resistance of the tab and experience a larger current).
The 18650 battery supports high current discharge, which can reach 20 times the capacity. The lithium batterym ordinary 18650 only supports one time capacity discharge. , the maximum discharge current is 2600 mA.
The capacity of an 18650 battery is generally about half that of a regular battery. It is estimated that it will not exceed 2000 mAh at most. Generally it is 1000mAh~1800mAh. Generally, the working voltage of electric batteries is lower than that of ordinary lithium batteries. The highest charging voltage of ordinary lithium batteries is 4.2V, and the highest charging voltage of power lithium batteries is about 3.65V.
The voltage rated voltage of ordinary lithium batteries is 3.7V and the rated voltage of power lithium batteries is 3.2V.
Regarding the development prospects of iron phosphate and lithium, a lithium battery material for new energy vehicles, and what advantages it providesCompared with other materials such as lithium manganate
< p >Classification of new energy vehicle batteries
New energy vehicle batteries can be roughly divided into two categories, one is lithium iron phosphate (LFP) battery and the other is lithium cobalt oxide battery (NCA, NCM). .
1. Lithium iron phosphate (LFP) battery: The positive electrode material of this battery is made of lithium iron phosphate, which is highly safe and not prone to explosion and environmental pollution. However, its capacity and weight are relatively small and its service life is short. It is only suitable for urban travel, short-distance travel and other scenarios.
2. Lithium cobalt oxide battery (NCA, NCM): The cathode material of this type of battery is usually made of materials such as lithium cobalt oxide or lcobalt oxide, which has a high capacity/weight. ratio and long life. However, lithium cobalt oxide batteries have higher costs and greater safety risks than other batteries. The ternary lithium battery supports high-power charging, so it is suitable for long-distance driving and high-speed driving scenarios.
3. Lithium iron phosphate (LFP)-lithium cobalt oxide (NCM) battery hybrid battery: This combination battery is suitable for electric vehicles and hybrid vehicles, achieving a balance between safety and cost-effectiveness.
4. Ternary lithium battery: Ternary lithium battery is a new type of lithium-ion battery. It is widely used in electric vehicles and hybrid vehicles due to its advantages such as high energy density, high voltage and long service life. the life. Electric vehiclest other areas. Ternary lithium batteries use nickel, cobalt and manganese oxides as positive electrode materials, and carbon materials as negative electrode materials.
Whatever the type of battery, chooseIt is very important that it is suitable for the model and use of your car.
As the heart of electric vehicles, the application areas of power batteries are special and complex. I have to say that in the past 100 years, it is not that power batteries have not developed well, but the huge technological progress in the oil industry and automobile industry has been remarkable.
Power battery manufacturing goes through four stages: battery materials, cells, battery modules and battery packs. Concepts that should be emphasized repeatedly throughout the systemThe technological theme of power batteries are: consistency requirements and standardized steps. From the perspective of technical implementation, the technological upgrade from small secondary batteries to power batteries cannot be easily achieved by simple "add". Power battery performance factors (power density, energy density, cycle life, safety, cost) are interrelated: high power and high energy are difficult to balance in design and manufacturing , and long-term high-power operation is serious. affects battery life, the heat generation phenomenon during high-power operation tests the safety performance of the battery, and power usage must be sacrificed to achieve longer life . High energy density has become a security risk. It is difficult to obmaintain overall technical satisfaction and can only seek balance. At the same time, it should be compared with the automobile fuel system. This is the biggest technological challenge. In terms of technical path choice, the inherent shortcomings of nickel-metal hydride batteries (self-discharge, low specific energy) mean that it is only a matter of time before they are replaced by batteries lithium. However, there are many arguments in favor of going the lithium battery route. Different electrode material systems can include lithium manganate, lithium iron phosphate, nickel-cobalt-manganese ternary and other technical routes. The technical routes most widely used by major lithium-ion battery manufacturers remain the lithium-manganese series and nickel-cobalt-manganese ternary technology.5KW battery (pack): add a battery management system, a supbattery port and protection system
Ordinary lithium ion power battery (<10AH) and large size lithium ion power battery (>20AH) What are the differences between the materials:
1. From the raw materials of the battery, the gram capacity is usually sacrificed to ensure the conductivity (such as the amount of carbon coating)
2. From the conductive agent A variety of combinations can be considered during selection
3. Increase the amount of conductive agent
4. Taking into account the overcurrent in the flow discharge ear and taking into account the quantity of conductive agent. internal resistance
5. It is generally best to consider the separator, mainly the thermal shrinkage and the safety of the separator due to heat release by discharge.
6 The electrolyte is usually a rate. discharge electrolyte
7. The choiceof the cap is also the same discharge rate, which also involves heat sensitivity issues and solder joint issues related to heat release.
Now that the end of the oil era is gradually coming to an end, electricity is beginning to gradually replace gasoline, and the heart of the car is beginning to transform into a battery. Nanotechnology is the key to all of this. -Expected high-performance lithium battery, which has an accuracy of 1 billion precision technology down to the tenth of a meter.