How about chinese batteries?

Comprehensive introduction to electronic cigarette battery knowledge

The battery is the most important part of the electronic cigarette device, which provides power to the main device to heat the heating wire and make the atomizer work. There are many kinds of electronic cigarette batteries on the market. Many people have a headache when choosing batteries. I don’t know what to use to buy batteries.

1. Basic knowledge of electronic cigarette batteries

Electronic cigarette batteries use lithium batteries. Lithium-ion batteries have high energy density and high average output voltage. Small self-discharge, good e-cigarette battery, less than 2% per month (recoverable). There is no memory effect. The working temperature range is -20℃~60℃. Excellent cycle performance, fast charging and discharging, charging efficiency up to 100%, and high output power. long lasting. Does not contain toxic and harmful substances, known as green batteries. The working voltage of the single battery is as high as 3.7-3.8V (3.2V for lithium iron phosphate), which is 3 times that of the old nickel-metal hydride battery.

Moreover, lithium-ion batteries have a long cycle life, generally reaching more than 500 times, or even more than 1,000 times, and lithium iron phosphate can reach more than 2,000 times, saving a lot of use costs.

 

2. Classification and indicators of electronic cigarette batteries.

The first is the size of the e-cigarette battery. I often hear “18650”, “26650”, and “18350”. What do these numbers represent? First of all, the general industry standard for battery models is marked with 5 digits. The first two The digit is the diameter of the battery, the next two digits are the length of the battery, and the last digit is the shape of the battery. For example, the “18650” battery, installed and interpreted as described above, is a “0” cylindrical battery with a battery diameter of “18” mm and a length of “65” mm. (Now some manufacturers omit the last digit “0”. Because the actual meaning is not very big, the shape of the battery can be distinguished by looking at the appearance of the battery. For another example, the “26650” battery has a diameter of “26” mm , a “0” cylindrical battery with a length of “65” mm. “18350” is a “0” cylindrical battery with a diameter of “18” mm and a length of “35” mm. It can be known from the data that “26650” and ” The 18650″ cells are all the same length, but the “26650” cells are thicker in diameter than the “18650” cells.The “18350” cells are shorter in length than the “18650” cells.

The most common use of electronic cigarettes is the “18650” battery. Of course, some mechanical rods can also use “18350” batteries. For example, the “pilot” mechanical lever is very small after using the “18350” battery. With the matching “HOBO” vagrant drop oil atomizer, the total length is only a little longer than 1 “18650” battery.

Of course, there are also some special mechanical rods or pressure regulating rods that support “18500” batteries, so I won’t go into details here.

The equipment using “26650” battery includes some mechanical rods, and the one that uses 26650 battery in the voltage regulator box is more familiar with the “T6” box of Clappon.

 

3. The meaning of the text and letters on the e-cigarette battery label

Electronic cigarette battery indicators: There are many professional indicators of the battery, such as capacity, discharge rate, positive electrode material type, internal resistance, etc. Many professional indicators are not used by ordinary users, so we will select a few more commonly used and main indicators to introduce.

Taking the “AW” battery as an example, you can get a general understanding of some information about the battery by first looking at the content printed on the outer skin of the electronic cigarette battery. “IMR” batteries, also known as lithium manganate (LIMN) batteries, are the safest batteries available for e-cigarettes. Because of the use of safe chemical raw materials, IMR batteries do not require protection circuits, and they can withstand greater Pressure and shock, although also leaking, are much better than ICR batteries. When the protection circuit of the ICR battery fails, the ICR battery will have a violent chemical reaction when it leaks, resulting in fire or even explosion.

“18650” is the size model of the electronic cigarette battery. “3.7V” refers to the battery’s voltage “2000mAh” refers to the battery’s capacity of 2000mAh. (Working for one hour at 7.4w).

In this way, when we see an electronic cigarette battery, we can roughly understand some basic information of the battery. In addition to the capacity, which determines the battery life, the other most important indicator is discharge.

For example, the “vappower” in the e-cigarette battery label picture, the small characters “Max.35A” at the bottom of the battery represent that the maximum sustainable discharge current of the battery is 35 amps, and “Pulse50A” means that the instantaneous current can reach 50 amps.

Why is the discharge current also one of the important indicators? For example, in the above battery, we can calculate through Ohm’s law, current = voltage/resistance, we divide 3.7 volts by 35 amperes, which is equal to 0.074Ω. In other words, this battery theoretically supports a minimum heating wire of 0.074Ω. What if it is a common 20A discharged battery? Let’s calculate it again: 3.7÷20=0.185, that is to say, a 20A discharged battery supports a heating wire of at least 0.185Ω.

①Some people will say, since this is the case, just buy an electronic cigarette battery with a large discharge current, right? This is the first misunderstanding of the battery selected by the electronic cigarette: only use a battery with a large discharge.

Let’s first talk about the classification of lithium batteries. Lithium-ion batteries can be roughly divided into two categories by the size of discharge. One is energy-based batteries with capacity as the main indicator; the other is power-type lithium batteries with discharge output as the main indicator, also known as power batteries.

Batteries are limited by the current manufacturing process, and can only pursue high capacity, but the discharge current is generally small, or pursue power, high discharge, but small capacity. It is said that there is another important discharge index “C” of the battery. When you buy a battery, you often encounter such an introduction, that is, instead of writing the discharge current of the battery, you write how much C is discharged. What is this “C”? “C” is used to indicate that the battery is charged. The ratio of the current size during discharge, that is, the magnification. For example, for a 2500mAh battery, 1C means 2.5A (1 rate of 2500Ah), and 1C means 2500mA (1 rate of 2500mAh).

It is precisely because of the influence of the discharge rate that it is difficult for high-capacity batteries to achieve high-rate output, and it is also difficult for high-output batteries to achieve high capacity. The specific principles are not explained here, otherwise the space is too long, and these knowledge are not important to consumers, as long as they know the general principles.

After reading the above knowledge, one of the misunderstandings is generally understood. Because the power battery with high current output generally has a small capacity, basically about 2500mA. If you only use it on the oil storage atomizer, the general resistance is above 1Ω. Using the power battery not only wastes the performance of the battery, but also reduces the battery life a lot.

Take an example to understand. For example, when I first came into contact with e-cigarettes, the main purpose was to quit smoking. Therefore, the KFL selected by the atomizer, the device is VAMOV5, a very old pressure regulating rod, the maximum power is only 15w, and the resistance is higher than 1.3Ω to work. So I chose Panasonic’s 18650BE3400mAh capacity battery.

The capacity of this battery reaches 3400mA, but only 6A is discharged. According to the minimum resistance of my electronic cigarette device VAMOV5 of 1.3Ω, it only needs 2.84 amps of current, (3.7 volts voltage ÷ 1.3Ω resistance = 2.84 amps of current) 6A is far enough. And the lowest resistance supported by 6A is (3.7 volts voltage ÷ 6A current = 0.61Ω resistance) 0.61Ω, that is to say, even if it is used on a mechanical rod, as long as the resistance of the heating wire of the atomizer is not less than 0.6Ω, this model The battery is fully capable. And the battery is sufficient, and the battery life is guaranteed. The same is true in actual use. I can use the 3400mA capacity for a day and a half, while the 2500mA battery needs 2 batteries a day. Therefore, the choice of battery should be based on its actual use, and cannot blindly pursue high output. This saves money without wasting battery performance. For example, if you buy a Ferrari, you are actually just buying groceries every day, with a distance of no more than 1 km and a speed of no more than 30 miles per hour. It would be better to buy an electric car, which is a waste of money and a waste of Ferrari’s performance. Therefore, choose the appropriate battery according to the actual use.

Through the above introduction, you have learned some basic knowledge of choosing electronic cigarette batteries. But how to do it? Let me give you an example.

At present, people use more pressure regulating equipment, so let’s first take a look at how to choose batteries for pressure regulating equipment. Voltage regulation equipment first depends on the highest power of the equipment and the number of batteries. For example, a voltage regulator box with a maximum of 30w, a single 18650 battery. Then let’s do the math and use the formula: power = voltage × current to convert. 30w÷3.7v=8.1a. That is to say, when this voltage regulator box is set to a maximum power of 30w, the maximum output current of the battery is 8.1A, then choosing a Panasonic battery with an output of 10A and a capacity of more than 3000mA is completely sufficient, and the battery life can last. still long. If you buy vct4, it only has 2000mA, but it can only output 8.1A at most, not only the standby time is much shorter, but also the performance of the battery is wasted a lot.

Seeing this, some careful friends want to say: “Your calculation method is wrong! Why is the voltage of 3.7v? My equipment can obviously reach the voltage of 6v!”

Here I have to talk about the principle that the voltage regulating equipment can change the voltage. According to the law of conservation of energy, all energy will not be created out of thin air, nor will it disappear out of thin air. In fact, the principle of voltage regulation is to achieve the purpose of changing the voltage by changing the current. The output of the current is controlled by the chip, and the voltage will be changed accordingly according to the formula of power = voltage × current. And now the general voltage regulation equipment is mainly set with power, because it is more intuitive. If the voltage is set, you have to convert the success rate yourself, which is very inconvenient.

Let’s talk about the voltage of 3.7v. Generally, the working voltage of a lithium-ion battery is 3.7v, when it is fully charged, it is 4.2v, and when it is out of power, it is about 3v. Of course, some lithium batteries made of special materials, such as lithium iron phosphate, are special, and the full charge is 3.2v. General calculations are based on 3.7v as the standard voltage.

Another example is a 60w voltage regulator box that uses a single-cell 18650 battery. How to choose a battery? Calculate it and find out: 60÷3.7=16.21, which means that the discharge current of the battery cannot be lower than 16.21, which is generally within the range of batteries. The discharge is 20a, most of the capacity is 2500mA, so choose 2500mA, 18650 battery with 20a discharge.

Having talked about the common portable mini boxes, let’s talk about how to choose batteries for the more popular high-power boxes. For example, Sigre’s 150w dual 18650 battery box. It is still calculated by the formula, but since the double battery box is generally connected in series with 2 batteries, the voltage is not 3.7v, but 3.7v×2=7.4v. The calculation shows that 150w÷7.4v=20.27a, it can be seen here that the battery discharge is higher than 20a, so it is not suitable to use a battery with a maximum continuous discharge of 20a. Because when you use a 20a battery, when the power is turned on to 150w, the battery cannot meet the current required by the box voltage regulator chip, and the voltage will be automatically reduced to ensure safety. (PS: The chips in some boxes will not automatically reduce voltage protection. Long-term overload use will cause violent reactions such as battery overheating and even decomposition and leakage. Be sure to pay attention to safety.

Therefore, it is fully capable of purchasing a battery with a maximum sustainable discharge current of 25a for an electronic cigarette battery.

Special introduction: When general merchants introduce electronic cigarette batteries, they will introduce two indicators. One is the maximum sustainable discharge current and the maximum instantaneous discharge current. It must be noted here that the maximum sustainable discharge current should be used as the standard when purchasing batteries. Can not see the instantaneous maximum discharge. For example, the maximum sustainable discharge is 25a, and the maximum instantaneous discharge current is 100a! I’m not mistaken, it is indeed 100a, but it can only last for 0. a few seconds, which is meaningless.

Having talked about the voltage regulation equipment, let’s take a look at the use of mechanical poles for electronic cigarette batteries. Since the mechanical rod does not have a chip, it is necessary to pay more attention to the selection of batteries. In the words of one player: “For the mechanical lever, as long as you dare to press the switch, it dares to work, but it will play randomly in the smoke, heat, explosion…” Although this sentence is a joke, but But it is a good illustration of the importance of battery quality to the mechanical rod. Since the editor himself prefers to use mechanical rods, many friends say: “You are not afraid of explosions!?” In fact, as long as the workmanship is qualified and the design of mechanical rods is reasonable, it has nothing to do with explosions. The danger is due to the protagonist of this article – the battery. Using counterfeit, shoddy, mismatched batteries, or exceeding battery capacity on any device, not just mechanical levers, can be dangerous!

Closer to home, the selection of the battery by the mechanical rod is actually the same as that of the voltage regulating device, which mainly depends on the maximum sustainable discharge current of the battery. But the mechanical rod has no chip and cannot change the voltage, so how to choose it? It is calculated by the formula current = voltage ÷ resistance.

For example, the Panasonic 18650be battery mentioned above has only 6a discharge, which is 5 times worse than the 30a battery, and I have been using it on the mechanical pole. Many friends will say the above sentence again. In fact, it is known through calculation that the minimum resistance supported by the current of 6a is 0.6Ω. As long as the resistance of my heating wire is higher than 0.6Ω, why is it unsafe? The danger is that the battery is overloaded. If it is safe to use There is no problem when used within the load range. I also use this battery on the mechanical rod with the oil storage atomizer. The resistance is generally around 1.5Ω, so it is safe and has a large capacity. Of course, if you use this battery to play with ultra-low resistance dripping oil, it will be dangerous if you can’t get along with yourself! Remember!

For example, using a mechanical rod to play oil, 0.2Ω heating wire (don’t look at several heating wires, just look at the total resistance value. The more heating wires, the lower the resistance. For example, a 1Ω coil, double hair is 0.5Ω, Four rounds is 0.25Ω, and so on. It’s not that the more the number of heating wires, the higher the resistance.) What kind of battery should I use? 3.7÷0.2=18.5, that is to say, when the resistance is 0.2Ω, the actual battery discharge current is 18.5a , 20a discharge battery is fully capable. But do pay attention, try to use a voltage regulator box or 26650 battery for the ultra-low resistance heating wire. Because the voltage regulator box has chip protection, and the 26650 battery has a much larger discharge than the 18650 battery due to the production process and materials, and it supports low resistance better. Therefore, no matter how powerful the output current of the 18650 battery is, it is not recommended to use it on the heating wire below 0.2Ω, safety first.

 

 

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