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

Naming secondary batteries based on their size is one of the regulations of the International Electrotechnical Commission (IEC). According to the IEC61960 standard, the identification method for secondary lithium batteries is as follows:

1. Composition of battery identification: 3 letters followed by 5 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 cylindrical battery has 5 numbers representing the diameter and height of the battery, with diameter in millimeters and height in one tenth of a millimeter. When either the 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, add the letter't 'before this dimension, which is measured in one tenth of a millimeter. For example:

ICR18650: Represents a cylindrical secondary lithium-ion battery with cobalt as the positive electrode material, with a diameter of approximately 18mm and a height of approximately 65mm.

There is a simple three part identification composition:

For example: LC18650: Lithium ion battery cylindrical battery specifications with a diameter of 18m and a height of 65.0mm.

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

The 18650 lithium battery named by IEC is actually a photovoltaic battery, also known as a battery cell in the industry; In practice, protective plates, leads, and labels need to be added at the battery packaging factory. For example, the lithium battery cleaner produced by Dongguan Juda using 2200mAh18650 battery cells has a product size of 19.5mm in diameter and 70.0mm in height. This is obviously larger than the size of the battery cell.

At this point, we understand that when it comes to the concept of "18650 lithium battery size", there may be two different meanings: one is the size of the 18650 lithium battery with bare body, and battery manufacturers in this sense mainly include Sanyo, Panasonic, Samsung, LG, Bick, etc; Another type is the encapsulated 18650 lithium battery size, 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.

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