Electric vehicle battery pack electrical structure capable of achieving rapid charging

Abstract

The invention relates to an electric vehicle battery pack electrical structure capable of achieving rapid charging. The electric vehicle battery pack electrical structure comprises a battery unit, a charging switch unit, a discharging switch unit, a direct-current bus unit, a vehicle-mounted charging unit and a direct-current rapid charging interface. Three charging switches and four discharging switches are all electrical switches. The electric vehicle battery pack electrical structure is characterized in that the battery unit is provided with two battery modules, the vehicle-mounted chargingunit is provided with two vehicle-mounted charging interfaces, and the direct-current bus unit is provided with two sets of direct-current buses; the discharging switches are turned off and the charging switches are turned on, thus the two battery modules are in series connection, and rapid charging is conducted through the direct-current rapid charging interface; the charging switches are turnedoff and the discharging switches are turned on, thus the two battery modules are discrete, and the two sets of direct-current buses conduct discharging independently (or in a common-ground mode or parallelly); and after a vehicle is parked, all the discharging switches and the charging switches are turned off, and the two battery modules can be charged slowly through the two vehicle-mounted charging interfaces. The electric vehicle battery pack electrical structure has the advantages of 1, series high-voltage rapid charging and discrete low-voltage safety discharging, and 2, electric energy redundancy and power supply redundancy, convenient driving of redundancy, and active equalization.

Description

technical field [0001] The invention relates to an electrical structure of a battery pack of an electric vehicle capable of fast charging, and belongs to the technical field of electric vehicles. Background technique [0002] The three core technologies of electric vehicles are multi-energy powertrain control system, motor and its drive system (referred to as power system), battery and its management system (referred to as battery system). [0003] The two key subjects of electric vehicles are the battery system and the power system. The battery system includes battery packs, electrical switches, and battery management systems (BMS); the power system includes electric motors, motor drives, and reducers. The power system of electric vehicles is mainly divided into three types according to the number of motors used: single-motor system, double-motor system, and four-motor system. [0004] Most of the current electric vehicle battery systems are equipped with a battery pack. ...

AI Technical Summary

Problems solved by technology

Although the 800V power system can achieve fast charging, the disadvantages are also very obvious: first, the insulation problem is a challenge; second, the increase in voltage leads to an increase in the volume of the motor and electrical components (for example, the volume of the motor driver may increase by 10%) ; Third, this is a new concept for passenger cars, and all core components need to be redesigned; in addition, there are few companies that can provide 800V related components, and the industrial chain needs to be redeveloped

[0011] In short, this wide range of battery voltage tends to be high-voltage, which brings great hidden dangers to the insulation safety of electric vehicles, and brings great disadvantages to the development and standardization of core components such as drives and motors, as well as the development of the entire industrial chain.

At the same time, it also seriously affects the charging efficiency, stereotyped design, mutual compatibility, development and construction, and operation and maintenance of charging piles.

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