Analyze the basic theory of lithium battery fast charging

Abstract: In order to overcome the shortcomings of the traditional high-power microwave remote sensing satellite constant current and constant voltage strategy, long charging time, and other shortcomings, based on the three laws of mas, a depolarization method is proposed to speed up charging. In the process, the new space is a lithium battery fast charging strategy, that is, in a charging cycle, multi-stage segmented constant current charging is used, and a fixed threshold short discharge is added. This method can increase the charging current of the lithium battery without reducing the battery cycle life. In the MATLAB/SIMULINK software, an unregulated primary bus voltage power system simulation model based on the parallel connection of the solar array sequence switch is established, and the example is simulated and compared. The results show that the fast charging strategy can save more than 56 charging times and effectively eliminate charging polarization. The research results of this paper can provide new ideas for the on-rail multi-mode charging control of lithium batteries in the future. Keywords: space lithium battery; fast charging; charge polarization; non-adjustable bus lithium battery due to its high specific energy, low thermal effect, no memory effect and other characteristics, gradually become the third generation of space after cadmium nickel battery and nickel hydrogen battery Energy storage power supply. The cycle life of lithium batteries is an important factor affecting the service life of a spacecraft in orbit. The traditional view is that high-current charging will cause irreversible damage to the positive electrode active material of the battery, as well as grid corrosion, gas chromatography, etc., which will cause the battery to fail prematurely. Therefore, conservative methods are usually used at present. The charging curve of current charging has a fixed value, with a small cost in exchange for a longer cycle life. However, in actual satellite payloads, microwave-type loads are used. For example, they often face huge energy consumption, long hours of work lead to unbalanced charging and discharging of shadow light rail cycle batteries, or satellites after emergency missions, battery discharge depth and rapid charging, etc. Wait, it is urgent to find a fast battery charging method with high charging efficiency, short charging time and little impact on service life. At present, there are many researches on the rapid charging of lithium batteries in the field of new energy such as ground electric vehicles. The literature has studied the method of fast charging of on-board battery and the design of fast charging station on the ground, the results can be used for reference. This article first analyzes the basic theory of lithium battery fast charging, and combines the more mature Se-quential switching shunt regulator (S3R) model without adjusting the busbar power system topology to study the method of lithium battery fast charging. Finally, the simulation and verification results are given. This article introduces the rapid charging strategy of lithium batteries for ground electric vehicles into the aerospace field. Abstract According to the Three Laws of Mars, a new method for rapid charging of lithium batteries in space is proposed, that is, multi-level constant current charging is used in one charging cycle, and a short discharge with a fixed threshold is added. The simulation model of S3R random bus power system is established in MATLAB/SIMULINK, and the constant current and constant voltage charging strategy of traditional lithium battery is simulated and compared with the fast charging strategy proposed in this paper. The simulation results show that the fast charging strategy can save more than 56 charging times and shorten the charging process. It should be pointed out that most spacecraft have stable payloads and do not charge quickly in orbit. As for spacecraft that require high-power load applications in a short time, such as satellites equipped with synthetic aperture radar (SAR) payloads, the fast charging strategy can increase the start-up time of the SAR payload, extend its working time, and provide better supplies for users. Service. In the future, satellite payloads are developing in the direction of high power and diversification. The fast charging method proposed in this paper provides a new idea for on-rail multi-mode charging control of lithium batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.