The 18650 lithium battery comes in two sizes
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2023/05/15 11:01:26
18650 lithium battery is named after the battery size. For a single battery, 18650 lithium battery size has two kinds: bare body battery and finished battery, the latter is larger than the former in value. To understand the size of 18650 lithium battery, we may start from its history.
Secondary battery size to name is one of the provisions of the International Electrotechnical Commission (IEC), according to the IEC61960 standard, secondary lithium battery identification method is as follows:
1. Battery logo composition: 3 letters followed by 5 digits cylindrical or 6 square digits;
2. The first letter represents the negative electrode material of the battery: I represents lithium ion with built-in battery, L represents lithium metal electrode or lithium alloy electrode;
3. The second letter represents the anode material of the battery: C electrode based on cobalt, N electrode based on nickel, M electrode based on manganese, V electrode based on Vanadium;
4. The third letter represents the shape of the battery: R for cylindrical battery, L for square battery;
5. Number: 5 numbers of cylindrical battery respectively represent the diameter and height of the battery, the unit of diameter is mm, the unit of height is 1/10 mm, diameter or height any size greater than or equal to 100mm between the two sizes should be added a diagonal line; Square battery six numbers respectively represent the thickness, width and height of the battery, the unit of mm, three sizes of any one is greater than or equal to 100mm between the size should be added diagonal line; If any of the three sizes is less than 1mm, the letter t is added before the size. The size is measured in one-tenth of a millimeter. For example:
ICR18650: represents a cylindrical secondary lithium ion battery, the positive material is cobalt, its diameter is about 18mm, the height is about 65mm.
There is a simple three-part notation:
For example, LC18650: Lithium ion battery The diameter of the cylindrical battery is 18m and the height is 65.0mm.
The above statements about the size of 18650 lithium battery are approximate numbers. There will be some small differences between the products of various battery manufacturers, but the differences are not large, that is, on the basis of the design of 18m in diameter and 65.0mm in height, the difference is generally ±0.2mm in diameter and ±2.0mm in height; Recognition of 18650 lithium battery, similar performance is the true meaning.
The 18650 lithium-ion battery, as IEC calls it, is actually a bare body battery, also known in the industry as a cell; Practical, but also in the battery packaging factory there to add protection plate, lead and label, such as Dongguan Jusa using 2200mAh18650 cell prepared lithium battery cleaner lithium battery products, its product size is 19.5mm in diameter, 70.0mm in height. This is obviously larger than the cell size.
Here, we understand, when referring to the concept of "18650 lithium battery size" may have two different meanings: one is the naked 18650 lithium battery size, this sense of battery manufacturers are mainly Sanyo, Panasonic, Samsung, LG, Bic, etc.; The other is the size of the packaged 18650 lithium battery. In this sense, the size is definitely larger than the size of the bare 18650 lithium battery. Therefore, we must pay attention to the language environment where the concept of 18650 lithium battery size is located.
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