A kind of pure electric vehicle charging system and charging method based on lithium battery

Abstract

The invention discloses a pure electric vehicle charging system based on a lithium battery, including a power supply device, a vehicle charger, a main relay, a battery management controller, a lithium battery pack, and a vehicle controller. The power supply device provides 220V alternating current, and It can issue control and guidance signals; the on-board charger is responsible for converting the alternating current output by the power supply equipment into the direct current required for charging the lithium-ion battery; the main relay is installed inside the lithium-ion battery pack and controlled by the vehicle controller to determine the high-voltage circuit The conduction and disconnection of the battery; the battery management controller is used to monitor the status of the lithium battery pack; the vehicle controller communicates with the on-board charger and the battery management controller through the CAN bus. The invention also provides a lithium battery-based pure electric vehicle charging method. The whole vehicle controller of the present invention monitors and monitors the whole charging process, and through the failure protection strategy in the charging process, the safety performance of the whole vehicle during charging is effectively improved.

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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