V2G safety control method and system based on battery temperature and health state

Abstract

The invention discloses a V2G safety control method and system based on battery temperature and the health state. The V2G safety control method comprises the following steps that the battery temperature and the health state of an electric vehicle in the current state are obtained; whether a battery needs to be preheated or not is judged according to the acquired temperature; according to the battery temperature and the health state, in combination with a battery attribute data table, the maximum allowed discharge rate is given; and the power smaller than the maximum discharge rate is selected to feed back electric energy, the maximum temperature difference between all battery groups is measured after the electric energy is fed back for a period of time, and then the discharge rate is reduced if the maximum temperature difference exceeds a preset value. By means of the method, according to the battery temperature and the health state, the temperature difference between all battery groups is considered in the electric vehicle power energy feedback process to adjust the discharge rate, it is ensured that the electric vehicle can safely conduct energy feedback on a power grid, and meanwhile, additional losses caused to the battery in the using process can be reduced.

Description

technical field [0001] The invention relates to the technical field of smart grid monitoring, in particular to a V2G security control method and system based on battery temperature and health status. Background technique [0002] V2G (Vehicle-to-grid) is the abbreviation of electric vehicle-to-grid interactive technology. It can realize that when electric vehicles are connected to the grid when they are not in use, the electricity stored in the battery can be stored during the peak period when the grid load is relatively high. Feed back to the grid; when the electric vehicle needs to be charged, it can obtain electricity from the grid during the off-peak period when the grid load is relatively low. Through the interactive energy transmission between electric vehicles and the grid, allowing them to participate in grid energy scheduling, it can effectively "shave peaks and fill valleys" on the grid, and improve the stability of the power system operation. According to relevan...

AI Technical Summary

Problems solved by technology

In the process of the vehicle feeding back electric energy to the grid, due to the internal resistance of the battery pack, heat will be generated to increase its temperature, and the temperature rise of the battery pack in different regions will be different due to the difference in heat dissipation conditions, which will cause the battery pack to use Due to the difference in temperature, if the maximum temperature error between the various battery packs exceeds the limit value of the discharge rate, it will have different degrees of impact on the health of the battery, that is, it will cause additional loss to the battery; at the same time, for the number of cycles experienced (one complete The charging and discharging is one cycle) Different batteries have different health status

The current V2G technology does not consider the battery temperature and health status when feeding back power

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