What is the difference between lithium batteries 18650, 18500, and 18350?

What is the difference between lithium batteries 18650, 18500, and 18350?

Firstly, they all refer to the specifications (i.e. size), with the first two digits representing the battery diameter, and the third and fourth digits representing the length, in units of; The latter represents cylindrical shape. In terms of 18650, it is a cylindrical battery with a diameter of 18 millimeters and a length of 65 millimeters. Because lithium batteries also have block shaped components, such as smartphone batteries, which are mostly block shaped. 18500 and 18350, and so on.

So what are the differences between the 18650, 18500, and 18350 models in lithium batteries? We can analyze the specific steps and methods by distinguishing them, as follows:

1) The voltage is very high.

2) Not just energy. At present, the actual specific energy is about 555wh/kg, which is close to 88% of the theoretical value.

3) Long life cycle. Generally, it can reach over 500 times, or even over 1000 times.

4) Good performance in safety management work. Pollution free, no memory information network economic effect As a precursor of lithium ions, lithium batteries are prone to dendrite formation and short circuits, which reduces their application areas. Lithium ions do not contain elements that pollute the environment such as cadmium, lead, and mercury, but they do not have this problem.

5) Small self discharge. The self discharge rate of lithium ions stored at room temperature for one month is about 2%

6) Fast charging and discharging speed.

7) The temperature variation range in the working environment is high. The working temperature is -25~45 ° C, with the improvement of electrolyte and positive electrode research.