New energy vehicle local equalization charging system

Abstract

The invention relates to a new energy vehicle local equalization charging system, which adopts a DC bus power supply topological network, wherein the DC bus power supply topological network comprises a power distribution device, charging stations, a bidirectional AC / DC module and an equalization charging module; the power distribution device is connected with a high-voltage power grid, divided into two paths after voltage transformation and filtering and then connected with subsequence nodes; one path is connected to the equalization charging module, the other path is connected to a low-voltage power grid; the low-voltage power grid is connected with the bidirectional AC / DC module through a cable; the equalization charging module is connected with the bidirectional AC / DC module through a cable; a data acquisition unit, a CAN bus, a battery BMS system and a BMS intelligent analysis unit are arranged inside the equalization charging module; and the bidirectional AC / DC module is connected with the charging stations through a DC bus, and a charging machine is arranged inside each charging station. The new energy vehicle local equalization charging system can detect output current and voltage of a matched low-voltage power distribution cabinet and electricity consumption of the current charging machine in real time, and notifies the corresponding charging machine to adjust the charging strategy through an internal equalization strategy once detecting that the output current exceeds a quota limit.

Description

Technical field [0001] The invention belongs to the field of new energy automobile manufacturing, and specifically relates to a new energy automobile local balanced charging system. Background technique [0002] Due to the limitation of power battery energy and terminal voltage of new energy vehicles, new energy vehicles need to use multiple batteries for series and parallel combination, and the highly nonlinear characteristics of power batteries make the battery management system (BMS—Battery Management System) a must for electric vehicles. 备装置。 Equipment. The most basic function of BMS is to monitor the working status of the battery (battery voltage, current and temperature), predict the battery capacity (SOC) of the power battery and the corresponding remaining mileage, and perform battery management to avoid overdischarge, overcharge, and overheating. There is a serious imbalance in the voltage between the battery and the single battery, and the battery storage capacity and c...

AI Technical Summary

Problems solved by technology

However, in the actual operation process, the charging process of the charger is also restricted by the load of the power distribution cabinet. During the charging process, if the balance method is not adopted to limit the charging process, it is likely to cause the entire power distribution cabinet to be overloaded and cause the entire charging system to fail. system crash

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