Analysis of BYD bidirectional inverter charging and discharging technology

    Incomplete supporting facilities have always been a major problem restricting the development of new energy vehicles. At the BYD Technology Analysis Conference, BYD demonstrated a new energy research and development achievement - bidirectional inverter charging and discharging technology. It integrates the functions of drive motor, on-board charger and DC charging station. It can convert the AC power of the power grid into DC power for charging, and can also reverse the DC power in the battery into AC power to power external electrical appliances.

    At present, there are two common ways to charge electric vehicles:

    One is to build professional charging stations to achieve DC high-power fast charging, but the investment is huge and it is difficult to recover the cost, so it is difficult to promote commercially;

【Electric Vehicle Charging Station】

    The other is the on-board charger, which is convenient to charge, but the AC charging power is small and the charging time is too long, which is especially not suitable for electric buses.

【Car charger】

● Bidirectional inverter charging and discharging technology solves the difficulty of charging electric vehicles

    DC charging has high power, but it can only be charged at charging stations, and the supporting facilities are not yet perfect. AC power is available in every home, but the charging power is low, so few people use household AC power to charge. Now BYD's bidirectional inverter charging and discharging technology has successfully solved this contradiction. This technology combines the advantages of high DC charging power and convenient AC charging, and is directly integrated into the motor controller to achieve high-power AC charging. In this way, electric vehicles can be charged directly with AC power. The problem of electric vehicles relying on professional charging stations has been well solved.

【Bidirectional inverter charge and discharge drive motor controller】

    V→G (vehicle-to-grid) mode Electric vehicles can not only be charged through the grid, but also feed electricity back to the grid to achieve peak shaving and valley filling. For example, during the low electricity consumption period at night, we can charge electric vehicles and store energy in the battery. Then during the peak electricity consumption period during the day, the vehicle will be connected to the grid and discharge the stored electricity to the grid. This will reduce the power supply burden of the grid to a certain extent, thereby achieving peak shaving and valley filling. China's peak electricity consumption is so tight now. If electric vehicles are popularized in the future, they can also play a role in stabilizing electricity to a certain extent by relying on the role of each electric vehicle. Then electric vehicles will not only be a driving tool, but also a power transmission tool that is beneficial to people's livelihood. This is also what BYD can consider, making the car more than just a car.

【V→G (vehicle-to-grid) mode】

    V→V (car-to-car) mode enables mutual charging between vehicles. It further expands the charging range of electric vehicles and can be used as an emergency rescue vehicle to charge vehicles that cannot operate due to insufficient power. For example, if you are driving a BYD electric car and encounter an electric car that has run out of power and is stranded, and there is no charging station nearby, you can lend a helping hand. In the car-to-car charging mode, the charging capacity can reach 20 degrees in half an hour, and the driving range can reach 100 kilometers.

【V→V (car to car) mode】

    V→L (vehicle-to-load) mode can realize single-phase/three-phase load function when the vehicle is off the grid. Provide reliable power support for household appliances when the power is off at home or when camping outdoors. As long as it is an appliance below 15KW, such as electric kettles, induction cookers, etc., this technology can provide single-phase AC power, which adds icing on the cake for camping. At the same time, e6 can not only power the above appliances, but also provide three-phase AC power for the entire building. When encountering natural disasters or other special circumstances that cause the power grid to be interrupted, the electric car will be transformed into a mobile power station and connected to the grid for emergency use. If a family uses about 6 degrees of electricity per day, based on this conversion, an e6 can power the entire family for up to 10 days, effectively improving the convenience of family users for using electric vehicles.

【V→L (vehicle to load) mode】

●What are the advantages of bidirectional inverter charging and discharging technology?

    Innovative charging technology, charging equipment investment is almost zero. BYD's bidirectional inverter charging and discharging technology has innovated all kinds of existing external charging equipment, directly integrated into the motor controller, and charging investment is almost zero, breaking the existing technology of electric vehicles' dependence on charging equipment, and effectively solving the shortcomings of charging stations such as large space occupation, high cost, and disadvantages of popularization;

    The charging standard is simplified and applicable to electrical standards around the world. With this technology, the charging process becomes very simple. It can be charged through a mains adapter. It can adapt to different voltage levels around the world and meet electrical standards in various places. Single-phase, two-phase, and three-phase AC can charge the car.

    Comply with international standards to effectively ensure charging safety. The charging system design complies with Chinese national standards and widely refers to European and American electrical standards. It has strong versatility, high safety and reliability, and has been fully verified;

    The charging method is flexible and can meet various needs. The V→G (vehicle-to-grid) mode can realize peak shaving and valley filling; the V→V (vehicle-to-vehicle) mode can realize mutual charging between vehicles; and the V→L mode can realize emergency power supply in emergency situations when the vehicle is off the grid. It can be said that this technology will completely subvert the traditional charging habits of electric vehicles, effectively improve the convenience of electric vehicles for home users, and provide strong technical support and development direction for the future market promotion of electric vehicles.

    Summary: BYD's bidirectional inverter charging and discharging technology has revolutionized all types of existing external charging equipment, combining the advantages of high DC charging power and convenient AC charging. The current new energy vehicle market is in the ascendant, and whoever can seize the market opportunity first will lead the development of the industry. Undoubtedly, BYD has taken the lead. Bidirectional inverter charging and discharging technology not only helps us save more time, energy and energy, but also solves the problem of difficulty in charging electric vehicles. It will surely play a big role in future development.