Pacific Automotive Network's lithium iron phosphate material has better cycle performance and can still maintain more than 80% of its initial capacity after 5,000 1C cycles. Type 18650 lithium battery is a lithium battery commonly used in electronic products and is often used as the battery core in laptop batteries.
Of course, lithium iron phosphate, but lithium iron phosphate is very expensive to produce with low capacity. Its advantages are stability, strong consistency and high number of cycles 18650 are generally seen in lithium batteries. while lithium iron phosphate batteries are more common and relatively rare. Lithium iron phosphate as a lithium battery material has only emerged in recent years. The domestic development of large-capacity lithium iron phosphate batteriesIt was held in July 2005.
Its safety performance and service life are unmatched by other materials, and they are also the most important technical indicators of power batteries. The lifespan of 1C charge and discharge cycle reaches 2000 times. A single battery will not burn when overcharged to 30V and will not explode if punctured.
The lithium iron phosphate cathode material facilitates the series use of large-capacity lithium-ion batteries. To meet the frequent charging and discharging needs of electric vehicles. It has the advantages of non-toxic, pollution-free, good safety performance, wide source of raw materials, cheap price, long service life, etc. It is an ideal cathode material for the new generation of lithium-ion batteries.
This new material is not the previous lithium-ion Li battery cathode materialCoO2 LiMn2O4; Its safety performance and service life are unmatched by other materials, and they are also the most important technical indicators of power batteries. The lifespan of 1C charge and discharge cycle reaches 2000 times. A single battery will not burn or explode when overcharged to 30V. Puncture does not explode. Lithium iron phosphate cathode material facilitates the use of large capacity lithium ion batteries in parallel and series.
(Images/Text/Photos: Pacific Automotive Network Q&A)
Why do 18650 lithium batteries have different capacities?
The 18650 power lithium battery can be discharged at a higher rate.
Take power lithium batteries made of lithium iron phosphate and ordinary lithium batteries as examples. Although all the systems and structuresIf the materials of the 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 pulled from the positive and negative electrodes than the ordinary type (. Reduce the internal resistance of the pole lug and respond to larger current).
The 18650 battery supports high current discharge, which can reach 20 times the capacity. Ordinary 18650 lithium battery 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 maximum. Typically around 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 maximum charging voltage of lithium battery is about 3.65V.
The rated voltage of ordinary lithium batteries is 3.7V and the rated voltage of power lithium batteries is 3.2V.
What is the difference between 18650 lithium battery and a regular 18650 lithium battery?
18650 is one of the most commonly used lithium batteries. Diameter of 18mm and length of 65mm are widely used in electric vehicles, flashlights, uninterruptible power supplies, etc.
Specifications of 18650 batteryThe rated voltage of 18650 battery will be different depending on the type of battery. Taking common lithium-ion batteries as an example, its nominal voltage is 3.7V, saturation voltage is 4.2V and conventional. The capacity is 2,600 mAh, but batteries from different manufacturers, or batteries from different models from the same manufacturer, will have different rated capacities. Common capacities include 2000 mAh, 2200 mAh, 2600 mAh, etc. Batteries of different capacities will have different manufacturing costs. Currently, the conventional capacity of 2000 mAh is considered low capacity. There are also less expensive batteries with capacities of 1500 mAh or even lower. 18650 cans. The highest capacity achieved is around 3400 mAh.
Why do 18650 batteries have different capacities?In fact, it's not just 18650 batteries. Other types of batteries, even if they are the same size, will have different capacities. This is linked to the process ofmanufacturing of the battery, materials used, etc. There are differences in manufacturing costs for batteries of different capacities, which will cause differences in sales prices. When choosing a battery, you should make a choice based on factors such as actual capacity requirements and cost.
Although different capacities can be obtained by connecting batteries in parallel, when the space is relatively fixed, you should consider choosing batteries of different capacities. Some need to use larger capacities, and some only provide electrical power. but for parameters such as capacity, they are not demanding. In fact, besides the differences in rated voltage and capacity of 18650 lithium batteries, another important parameter is the discharge rate. This parameter determines the instantaneous and long-term output current of the battery,so 18650 batteries are generally divided into capacity type and power type. Capacity-type batteries focus on capacity and are generally used in situations where long-term low-current discharge is required; Power type batteries require instantaneous or continuous discharge current and are generally used in situations where the operating current is relatively large, such as power tools, etc.
The main reason that batteries of the same size will have different capacities is due to manufacturing cost. Considering this problem, it is necessary to make a reasonable choice according to the actual situation. As for the 5500mAh, 9800mAh, 12500mAh and other capacity batteries mentioned in the question, this is not realistic for a single 18650. These batteries are all batteries with virtual capacity standards. To achieve thisThis capacity, you must use several batteries in parallel. reached.
18The difference between 650 power lithium battery and ordinary 18650 lithium battery is as follows:
1. The capacity of lithium battery is different. The capacity of 18650 lithium battery is much smaller than that of ordinary 18650 lithium battery, which is less than 2000mah, about half as much.
2. The discharge current is different in size. The discharge current of 18650 lithium battery can reach about 20A, and the discharge current of ordinary 18650 lithium battery is about 1-3A.
3. The application scenarios are different. 18650 lithium batteries are mainly used in the production of new energy vehicle batteries. Ordinary 18650 lithium batteries are used in small digital devices and various power banksation.
Detailed information:
The difference between the power of 18650 lithium battery and the capacity of 18650 lithium battery
1. The main features of 18650 power lithium battery The material particles of the positive and negative electrodes are smaller and have less energy density than ordinary 18650 lithium batteries. The separation materials and electrolytes used have better conductivity and conductivity.
2. The 18650 lithium battery contains more tab materials in the positive and negative electrodes than ordinary 18650 lithium battery (to reduce the internal resistance of the tabs and respond to higher current).
3. The 18650 battery supports high current discharge, which can reach a rate of 30C. Ordinary 18650 lithium battery only supports 1C discharge rate. (1 Cis equal to 1 times the capacity)
4. The capacity of 18650 battery is generally about 1/2 less than ordinary 18650 lithium battery if the capacity is 2000 mAh. is only 1000 mAh5. The maximum charging voltage of ordinary capacity 18650 lithium battery is 4.2V, and the maximum charging voltage of power type 18650 lithium battery is about 3.65V.
< p>The rated voltage of ordinary capacity 18650 lithium battery is 3.7V, and the rated voltage of power 18650 lithium battery is 3.2V.