3.7V 18650 lifepo4 battery management system, lithium-ion battery life

　　3.7V 18650 lifepo4 battery management system, lithium-ion battery life. Lithium-ion batteries are representatives of modern high-performance batteries and are composed of four main parts: positive electrode material, negative electrode material, separator, and electrolyte. Different types of lithium-ion batteries have different natural lifespans (i.e. theoretical charge and discharge cycles). Whether lithium batteries are used and maintained scientifically determines the extension length of lithium batteries within their upper limit of life.

　　3.7V 18650 lifepo4 battery management system design

　　Due to the low voltage of a single lithium-ion battery, multiple cells are generally connected in series to form a battery pack in actual use. However, series-connected 3.7V 18650 lifepo4 batterys will shorten the service life of the battery pack under conditions such as overheating, overvoltage, and undervoltage, and may even cause safety issues such as fire and explosion. This requires a 3.7V 18650 lifepo4 battery management system to manage the battery pack. .

　　Therefore, the 3.7V 18650 lifepo4 battery management system has become a key device to solve the battery pack service life and safety issues, and plays a vital role in ensuring the safe use of the battery pack and extending the battery pack's service life. It is designed using microprocessor comprehensive detection and protection technology to realize charging, discharging and balancing management of 3.7V 18650 lifepo4 batterys, and realizes intelligent management through communication interfaces.

　　The design of the lithium battery management system implements a distributed structural design, which includes local measurement modules for power estimation, battery charging and discharging, and balancing between individual batteries. When the 3.7V 18650 lifepo4 battery is charged, if the battery pack is equipped with a battery management system, it must be connected to an external constant-voltage and current-limiting power adapter that can match it. The expression for calculating the constant voltage value U is: U=4.2*N+loss voltage; in the above formula, N represents the number of cells of the battery, and the loss voltage is obtained through experiments.

　　The new lithium-ion battery management system introduces in detail the hardware design of the system and the detailed design of each functional module. During the test, the system ran relatively normally, and various technical indicators, such as single cell voltage measurement, total current, total voltage, temperature measurement, etc., all met the requirements. The system has good reliability and practicality.

　　How long does a lithium-ion battery last?

　　The service life of lithium-ion batteries is only two to three years. Lithium batteries can generally be charged and discharged 300-500 times. It is best to partially discharge lithium batteries rather than fully discharge them, and try to avoid frequent full discharges. Once the battery rolls off the production line, the clock starts ticking. Regardless of whether you use it or not, the service life of lithium batteries is only two to three years.

　　Under the unified international standard, the life of a lithium-ion battery is not expressed by time, but by the number of cycles, that is, one complete discharge. The average lithium battery is between 500 and 800 times. A-grade polymer The battery can last up to 800 times. Therefore, if you choose a good battery supplier, the quality of the battery will be guaranteed and the service life will be longer.

　　If a lithium-ion battery is used in a high-temperature environment, such as a temperature above 350C, the power stored in the battery will continue to decrease, resulting in the battery's service life not being as long as working in a normal temperature environment. Charging the battery in such a high temperature environment will cause great damage to the battery, thus affecting the battery's service life. Even charging in a hot environment will cause varying degrees of damage to the battery, so you should try to avoid charging the battery in a high temperature environment. If you charge the battery in a low temperature environment, such as an environment below 40C, it will also cause damage to the battery.

　　The life of lithium battery is related to the number of completed charging cycles, but not directly related to the number of charging cycles. In fact, the life of a lithium battery is calculated from the moment it leaves the factory, not from the first use.

　　The above is an introduction to the 3.7V 18650 lifepo4 battery management system and lithium-ion battery life. If you want to maximize the performance of a lithium-ion battery, you need to use it frequently to keep the electrons in the lithium battery in a flowing state. If you do not use lithium batteries frequently, please remember to complete a charging cycle for the lithium battery every month and do a power calibration, that is, deep discharge and deep charging.

Read recommendations:

601435 270MAH 3.7V

Prospects for the development of lithium water batteries.LR6 alkaline battery

Graphite negative electrode for lithium batteries

Ni-MH battery packs Manufacturing

aaa alkaline battery