A charging and discharging control method and system for a power battery

Abstract

The invention discloses a power battery charging and discharging control method and system. The method comprises the following steps that firstly, battery working modes are detected through a detection circuit, wherein the battery working modes include the charging mode, the discharging mode and the charging and discharging conflicting mode; secondly, when the battery working mode is the charging mode or the discharging mode, a contactor is closed, and a battery is charged or discharged; when the battery working mode is the charging and discharging conflicting mode, the contactor is opened, and the battery does not work. The system comprises a battery working mode detection module and an execution module. According to the power battery charging and discharging control method and system, charging and discharging are controlled through the same relay and controlled in the same loop, so that the problem that the number of relays in use is large is solved, the circuit structure is simplified, and cost is saved.

Description

technical field [0001] The present invention relates to the technical field of power batteries, and more specifically, to a method and system for controlling charge and discharge of power batteries. Background technique [0002] China is the world's largest automobile producer and largest automobile consumer market. According to the analysis of relevant experts, the production and sales of electric vehicles in China will surpass the United States and become the world's number one. Many large cities in China are facing serious environmental pollution problems. There is no pollution and no pollution. Electric vehicles will have a tendency to replace traditional fuel vehicles, and their market value is huge. Lithium batteries are used more and more widely. Applications based on lithium batteries need to be implemented with a management system. Although the battery cells that make up the battery pack The cells with good uniformity, the same manufacturer, and the same model will ...

AI Technical Summary

Problems solved by technology

[0002] China is the world's largest automobile producer and largest automobile consumer market. According to the analysis of relevant experts, the production and sales of electric vehicles in China will surpass the United States and become the world's number one. Many large cities in China are facing serious environmental pollution problems. There is no pollution and no pollution. Electric vehicles will have a tendency to replace traditional fuel vehicles, and their market value is huge. Lithium batteries are used more and more widely. Applications based on lithium batteries need to be implemented with a management system. Although the battery cells that make up the battery pack The cells with good uniformity, the same manufacturer, and the same model will be selected, but it is impossible to ensure their complete uniformity in the manufacturing process, and there will be differences in charging or discharging characteristics between the series-connected battery cells; If the discharge process is not effectively controlled, it will intensify with the increase of times, shortening the effective service life of the battery pack

Over-temperature, over-voltage, under-voltage, and over-current phenomena occur in the lithium battery pack during charging and discharging, which will cause significant deterioration in the performance of the energy storage material in the battery, reduce the performance of the battery itself, shorten the service life, and greatly Reduced battery pack life

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