With the continuous progress of science and technology, lithium batteries are widely used in mobile phones, laptops, electric vehicles and other electronic devices because of their high energy density, long life and portability. However, there are certain safety risks in the use of lithium batteries, so it is particularly important to choose the right protection board (BMS, battery management system). This article will introduce you to the selection of lithium battery and protection board points.
First, basic knowledge of lithium batteries
1. Type: Lithium batteries are mainly divided into lithium-ion batteries and lithium polymer batteries. Lithium-ion batteries typically have a higher energy density, while lithium-polymer batteries are more flexible in shape and weight.
2. Capacity: The capacity of lithium batteries is usually expressed in milliampere-hours (mAh) or ampere-hours (Ah), and the larger the capacity, the more power the battery can store. The appropriate capacity should be determined according to the power consumption and use time of the device.
3. Voltage: The nominal voltage of lithium battery is generally 3.7V, and it can reach 4.2V when fully charged. Batteries with different voltages may be required in different application scenarios. Ensure that the battery voltages match those of devices.
Second, the importance of the protection board
The main function of the protection board is to ensure the safety of the lithium battery in the charge and discharge process, to prevent overcharge, overdischarge, short circuit and overheating. Choosing the right protection plate can effectively extend the service life of the battery and improve safety.
Third, the selection of the protection plate
1. Current carrying capacity: the rated current of the protection board should be higher than the maximum discharge current of the battery to avoid damage caused by overload. In general, it is safer to choose a rated current of more than 1.5 times the maximum discharge current of the battery.
2. Over charge and over discharge protection: Ensure that the protection board has over charge and over discharge protection functions. Overcharge can cause the battery to expand or even explode, while overdischarge can damage the cycle life of the battery.
3. Short circuit protection: Short circuit protection is one of the important functions of the protection board, which can quickly cut off the current in the event of short circuit to prevent battery damage and fire risk.
4. Temperature protection: Some high-end protection boards also have temperature monitoring functions, which can automatically power off when the battery temperature is too high to prevent safety hazards caused by overheating.
5. Balanced charging function: For multi-section series lithium battery packs, choose a protection board with battery balance function to ensure that the power of each battery is balanced and extend the service life of the overall battery pack.
4. Brand and quality
When choosing lithium batteries and protection boards, it is recommended to choose well-known brands and certified products. High-quality lithium batteries and protection boards are not only more reliable in performance, but also more secure in safety.
Fifth. Summary
The choice of lithium battery and its protection board is directly related to the performance and safety of the equipment. In the selection, the user should consider the type of battery, capacity, voltage and various protection functions of the protection board. Through a reasonable choice, the use experience and safety of lithium batteries can be effectively improved. I hope this article can help you in the selection process of lithium batteries and protection boards.
