This article will talk about cylindrical lithium batteries and their corresponding knowledge points, in order to increase one's knowledge and most importantly, hope to be helpful to everyone.
catalogue
How about cylindrical lithium batteries
What are the models of lithium battery cylindrical cells
Test method for capacitance of cylindrical lithium batteries
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What are the models of cylindrical lithium batteries
Cylindrical lithium batteries are a common battery shape with a wide range of applications. Its advantages include high energy density, stable safety performance, ease of production and quality control, etc. Cylindrical lithium batteries are widely used in consumer electronics, electric vehicles, wearable devices, and other fields. However, its drawbacks include low power density, difficulty in achieving high voltage and current, and weak impact resistance. Overall, cylindrical lithium batteries are a reliable and practical battery shape, but in specific applications, other shapes of batteries may need to be considered.
The common models of lithium battery cylindrical cells include 18650, 21700, and 26650. Among them, 18650 is the most common cylindrical cell, with a diameter of 18mm and a length of 65mm, 21700 with a diameter of 21mm and a length of 70mm, 26650 with a diameter of 26mm and a length of 65mm. Different models of battery cells have different capacities and discharge powers, which can be applied to different electronic devices and scenarios. These cylindrical cells are widely used in fields such as electric tools, electric vehicles, and energy storage systems.
Firstly, place the battery at room temperature for a period of time to reach a stable temperature.
2. Use a multimeter or specific battery testing instrument to connect the positive and negative poles of the battery and record the voltage of the battery.
3. Pass a certain current through the battery, usually 1/10 or 1/20 of the battery capacity, for a duration of 1-5 hours, depending on the size of the battery capacity.
4. After the current flows through, measure the voltage of the battery again and calculate the capacitance of the battery. The calculation formula for capacitance is: capacitance=current ×Time/voltage.
For some high-performance cylindrical lithium batteries, constant current discharge can be used to test their capacitance, which can more accurately measure the battery capacity.
It should be noted that the testing conditions of the battery should be as close as possible to the actual usage conditions, and the test results should be verified multiple times to improve accuracy.
There are various models of cylindrical lithium batteries, including 18650, 26650, 14500, 16340, etc.
Among them, 18650 is the most common model, with a diameter of 18 millimeters and a length of 65 millimeters. It has moderate capacity and voltage, and is widely used in fields such as power tools and laptops.
26650 is larger than 18650, with higher capacity and voltage, making it suitable for high-power applications such as electric vehicles and energy storage systems.
14500 and 16340 are smaller models suitable for small electronic devices such as flashlights and wireless microphones.
Overall, different models of cylindrical lithium batteries have different characteristics and application scenarios, which need to be selected based on specific needs.
