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18650 lithium battery size, specification parameters for 18650 lithium batteries. The common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. Among them, 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery. The production conditions for 18650 lithium batteries are high, and compared to general battery production, 18650 lithium batteries require high production conditions, which undoubtedly increases production costs.

18650 Lithium Battery Dimensions

18650 lithium batteries are named after the size of the battery. As for a single battery, there are two types of 18650 lithium batteries: bare body batteries and finished batteries. The latter is numerically larger than the former. Understanding the size of 18650 lithium batteries may start with its origin.

Naming secondary batteries based on size is one of the regulations of the International Electrotechnical Commission (IEC). According to the IEC 61960 standard, the identification method for secondary lithium batteries is as follows:

1. Battery identification composition: 3 letters followed by 5 numbers, cylindrical or 6 square numbers;

2. The first letter represents the negative electrode material of the battery: I represents lithium ions with built-in batteries, L represents lithium metal electrodes or lithium alloy electrodes;

3. The second letter represents the positive electrode material of the battery: C based on cobalt electrode, N based on nickel electrode, M based on manganese electrode, V based on vanadium electrode;

4. The third letter represents the shape of the battery: R represents a cylindrical battery, L represents a square battery;

5. Numbers: The five numbers for cylindrical batteries represent the diameter and height of the battery, with the diameter in millimeters and the height in one tenth of a millimeter. If any dimension of diameter or height is greater than or equal to 100mm, a diagonal line should be added between the two dimensions; The six digits of a square battery represent the thickness, width, and height of the battery, in millimeters. When any of the three dimensions is greater than or equal to 100mm, a diagonal line should be added between the dimensions; If any of the three dimensions is less than 1mm.

The above statements about the size of 18650 lithium batteries are approximate, and there may be slight differences in the products of different battery manufacturers, but the differences are not significant. That is, on the basis of a design with a diameter of 18m and a height of 65.0mm, the difference is generally between ± 0.2mm in diameter and ± 2.0mm in height; Identifying 18650 lithium batteries, similar performance is the true essence.

At this point, we understand that when the concept of "18650 lithium battery size" is mentioned, there may be two different meanings: one is the bare 18650 lithium battery size, and battery manufacturers in this sense mainly include Sanyo, Panasonic, Samsung, LG, Bike, etc; Another type is the size of the packaged 18650 lithium battery, which is definitely larger than the size of the bare 18650 lithium battery. Therefore, it is important to pay attention to the language environment in which the concept of 18650 lithium battery size is used.

Specification parameters of 18650 lithium batteries

18 represents a diameter of 18mm, 65 represents a height of 65mm, and 0 represents a cylindrical battery

The nominal voltage for a single section is generally 3.6V or 3.7V

The charging voltage is generally 4.20V (lithium cobalt oxide is 4.2V-4.3V)

The minimum discharge termination voltage is generally 2.75V, which can lead to a serious decrease in battery capacity or even scrapping if it is lower than this voltage

Maximum charging termination voltage: 4.20V

Diameter: 18 ± 0.2mm

Height: 65 ± 2.0mm

Capacity: Above 1000mAh, the conventional capacity is 2200mAh to 3200mAh. Currently, LG has the highest capacity for 18650 lithium batteries, which can achieve 3600mAh, but the price is not low.

The advantages of 18650 lithium batteries

Large capacity, the capacity of 18650 lithium batteries is generally between 1200mah and 310mah, while the general battery capacity is only about 800. If combined into an 18650 lithium battery pack, the 18650 lithium battery pack can easily exceed 5000mah.

Long lifespan, 18650 lithium batteries have a long service life, with a cycle life of over 500 times during normal use, which is more than twice that of ordinary batteries.

High safety performance, 18650 lithium battery has high safety performance, does not explode, does not burn; Non toxic, pollution-free, certified by RoHS trademark; All kinds of safety performance are achieved in one go, with more than 500 cycles; Good high-temperature resistance, with a discharge efficiency of 100% at 65 degrees Celsius. To prevent battery short circuits, the positive and negative poles of 18650 lithium batteries are separated. So the likelihood of it experiencing a short circuit has been reduced to the extreme. Protective plates can be installed to prevent overcharging and discharging of the battery, which can also extend its service life.

The voltage is high, and the voltage of 18650 lithium batteries is generally above 3.6 and 3.7, far higher than the 1.2V voltage of nickel cadmium and nickel hydrogen batteries.

There is no memory effect, so there is no need to empty the remaining battery before charging, making it convenient to use.

This is also the size of the 18650 lithium battery, the introduction of the specifications and parameters of the 18650 lithium battery. The capacity of the 18650 lithium battery can now reach 2500mAh, and the rate type battery can achieve 2C normal charging and discharging. So, the power can be very high.

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