Lithium battery based pure electric automobile charging system and charging method

Abstract

The invention discloses a lithium battery based pure electric automobile charging system. The charging system includes a power supply device, a vehicle-mounted charger, a main relay, a battery management controller, a lithium battery pack, and a vehicle control unit; the power supply device provides 220 V alternating current and can emit a control guiding signal; the vehicle-mounted charger is responsible for converting the alternating current output by the power supply device into direct current desired by lithium battery charging; the main relay is arranged in the lithium battery pack, is controlled by the vehicle control unit, and can determine on / off of a high voltage loop; the battery management controller is used for monitoring a state of the lithium battery pack; and the vehicle control unit communicates with the vehicle-mounted charger and the battery management controller through a CAN bus. The invention also provides a lithium battery based pure electric automobile charging method. The vehicle controller can monitor and control the whole charging process, and the vehicle safety can be effectively improved during charging through a fail protection strategy during charging.

Description

technical field [0001] The invention belongs to the field of new energy vehicles, and in particular relates to a lithium battery-based pure electric vehicle charging system and charging method. Background technique [0002] Compared with traditional cars, pure electric vehicles have the advantages of zero emission and no environmental pollution, so it is considered to be an important way to reduce environmental pollution and solve the energy crisis, and its application prospects are widely optimistic. Electric vehicles are powered by the on-board power supply, and use the motor to drive the normal driving of the vehicle. The power battery is the only source of power for pure electric vehicles. As a new type of battery, lithium batteries have the characteristics of high energy, high safety, high stability, long life and environmental protection, and lithium batteries have no memory effect, can be It can be charged at any point in the discharge cycle and can maintain the char...

AI Technical Summary

Problems solved by technology

[0003] At present, in the field of new energy, the charging control method for lithium batteries is mainly controlled by the battery management system and the on-board charger. However, in the way of optimizing the on-board charger to improve the charging efficiency of the lithium battery, the on-board charger usually charges with a large charging current, which ignores the state of the lithium battery itself, and easily causes the charging current of the lithium battery to be too large However, it will cause damage to the lithium battery and affect the service life of the lithium battery.

At present, the existing charging technology of pure electric vehicles generally only considers the safety of the battery during the charging process, while ignoring the influence of the state of the vehicle on charging, and the safety performance of the vehicle cannot be well guaranteed

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