Battery management system with balanced charge and discharge functions and control method thereof

Abstract

The invention discloses a battery management system with balanced charge and discharge functions and a control method thereof, relating to a battery management system of a dynamic battery pack. The battery management system is structurally characterized in that a central processing unit (CPU) control unit is connected with a battery and relay set so as to detect the working condition of the battery and relay set; the CPU control unit and a balanced discharge module are successively connected with the battery and relay set so as to control the balanced discharge of the battery and the relay set; the CPU control unit, a balanced charge module and the battery and the relay set are successively connected so as to control the balanced charge of the battery and relay set; and a super-capacitor is connected with the balanced discharge module so as to store the discharge energy of the battery and relay set for supplying power for the battery management system. The battery management system can be widely applied to management of various battery packs such as a lead-acid battery, a lithium battery, a nickel-metal hydride battery and the like, supports the expansion of a lower computer, and can conveniently detect and monitor the conditions of multiple batteries.

Description

technical field [0001] The invention relates to a battery management system of a power battery pack, in particular to a battery management system with a balanced charging and discharging function and a control method thereof. Background technique [0002] With the attention and investment of governments and car companies in electric vehicle projects, some large car manufacturers and battery suppliers have done a lot of research and experiments on various power batteries, and successfully developed related battery management systems. [0003] 1. In foreign countries, the research on electric vehicle power battery and its management technology is relatively early. The more representative ones are: [0004] 1. The battery management system on the electric vehicle EV developed by General Motors of the United States. The system consists of a battery module, a battery pack thermal management module, a battery pack high voltage power-off protection device (High Voltage Disconnect)...

AI Technical Summary

Problems solved by technology

[0006] 2. In China, research on battery management systems for electric vehicles is still in its infancy

Due to the use of resistance discharge, the energy utilization efficiency of the battery is not high, and the heat generation is large

In addition, the SOC (battery state of charge) value of the entire battery pack depends on the single battery with the smallest SOC value, and the single battery with the smallest SOC value is often the first to be fully charged and the first to be discharged. , so it is difficult to improve the SOC value of the whole battery pack simply by using the discharge equalization mode

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