Bidirectional DC/DC charging device and bidirectional DC/DC charging control method

Abstract

The invention belongs to the technical field of public transport and provides a bidirectional DC / DC charging device and a bidirectional DC / DC charging control method. The bidirectional DC / DC charging device comprises a pantograph, a super-capacitor bank, a power battery pack, a motor controller and a drive motor, wherein the pantograph is electrically connected with the super-capacitor bank and used for charging the super-capacitor bank, and the super-capacitor bank is electrically connected with the drive motor via the motor controller and is used for powering the drive motor. A DC / DC converter for achieving bidirectional energy transmission between the super-capacitor bank and the power battery pack is serially connected between the super-capacitor bank and the power battery pack. The bidirectional DC / DC charging device has the advantages that the super-capacitor bank and the power battery pack supply power in parallel and are more remarkable in auxiliary effect and complementary, so that system cost is reduced, and rapidity, reliability and safety of a charging control process are ensured.

Description

technical field [0001] The invention belongs to the technical field of public transportation, and in particular relates to a bidirectional DC-DC charging device and a charging control method. Background technique [0002] Energy and the environment have become the most concerned issues in the world. Energy is the foundation of the economy, while the environment is an important factor restricting economic and social development. The objective demand for energy saving and environmental protection promotes the development of electric buses, which also promotes the construction of infrastructure such as charging and swapping stations for large-scale electric buses. At this stage, the service objects of domestic charging and swapping stations in my country are mainly group users such as buses, taxis, and official vehicles. [0003] The current problems of electric buses: 1. The battery life is insufficient. At present, there are two solutions. One is to load a large number of en...

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Problems solved by technology

[0003] The current problems of electric buses: 1. The battery life is insufficient. At present, there are two solutions. One is to load a large number of energy storage power batteries on the electric bus. Although this mode can improve the battery life capacity, but still cannot meet people's needs, and the battery is expensive, and greatly increases the weight of the vehicle. Another way is to use the battery replacement mode. Due to the large structural differences of electric buses, the battery modules are difficult to standardize The popularization of scale, at the same time, due to the heavy weight of the battery, special battery replacement equipment is required, and frequent battery replacement brings a lot of hidden dangers to the safety and reliability of the electrical and mechanical equipment interfaces of the battery pack; 2. Battery life issues, currently using The charging mode of direct high-power fast charging of the vehicle power battery not only requires a charging system of hundreds of kilowatts, but also has a great impact on the life of the battery

In order to increase the cruising range, deep discharge and deep charging of the battery will have an impact on the battery life; 3. The price issue. At present, if the electric bus wants to achieve a more ideal cruising range, it needs to be loaded with a large-capacity power battery. Power batteries are relatively expensive, resulting in significantly higher vehicle costs; 4. Insufficient charging infrastructure, the current fast charging method for electric buses requires the construction of a large number of charging stations, even if the slow charging mode is used, due to The battery capacity is relatively large, and the generally designed bus charging piles also have about 60kw, and the charging time is long. Due to the problems of related infrastructure construction, the current electric buses cannot travel long distances. What should I do if I run out of electricity, even if I find a place to charge it, it may take several hours to fully charge the battery

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