Electric automobile power management system based on single chip microcomputer

Abstract

The invention relates to an electric automobile power management system based on a single chip microcomputer. The power management system is characterized in that the single chip microcomputer, a data acquisition module, a charging and discharging circuit, a battery pack module, a touch screen and a protection circuit are included; the data acquisition module comprises a current acquisition part, a voltage acquisition part and a temperature acquisition part; the battery pack module comprises a battery grouping circuit and an isolating amplifier circuit; the single chip microcomputer is in two-way connection with the touch screen, the current acquisition part, the voltage acquisition part and the temperature acquisition part simultaneously, the output end of the single chip microcomputer is connected with the input end of the protection circuit and the input end of the charging and discharging circuit, the output end of the protection circuit and the output end of the charging and discharging circuit are connected with one end of the battery grouping circuit, and the other end of the battery grouping circuit is connected with the input end of the current acquisition part, the input end of the voltage acquisition part and the input end of the temperature acquisition part simultaneously through the isolating amplifier circuit.

Description

technical field [0001] The invention relates to the technical field of a power management system applied to a lithium-ion power battery pack of an electric vehicle, in particular to a power management system for an electric vehicle based on single-chip microcomputer control. Background technique [0002] The electric vehicle power management system is a key part of the safe driving of electric vehicles. Its main function is to monitor, estimate and manage the operating status of the power battery pack, to avoid the phenomenon of overcharging, overdischarging and premature damage of individual cells, and to improve the performance of the power battery. The utilization rate of the battery pack can be extended to extend the cycle life of the battery pack, thereby increasing the cruising range of the electric vehicle. As we all know, the cycle life of a battery pack is often lower than that of a single battery. The main reason is that the battery pack does not have an effective ...

AI Technical Summary

Problems solved by technology

[0005] The University of Berlin in Germany has developed a power management system with relatively advanced technology and complete functions in the world to realize the unified management of multiple battery modules. However, this type of electric vehicle power management system can only manage a group of battery packs connected in series. It cannot be flexibly applied to electric vehicle power systems with multiple battery series and parallel connections, so the application range is limited

For example, as described in the invention patent CN 103496328 B, PLC is used as the controller of the power management system, and the system occupies a large volume, thus limiting the use environment of the power management system, and the process of estimating the SOC (battery remaining power) through PLC technology The cost of the system is greatly increased, and because the connection structure of the battery pack is fixed, the estimated results cannot accurately reflect the actual working conditions of the system, so it cannot be adjusted according to the needs of the system during use, which hinders Further use of batteries and electric vehicles

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