Wireless charging system for electric vehicle and wireless charging method thereof

Abstract

The invention provides a wireless charging system for an electric vehicle. The wireless charging system comprises the components of a first wireless charging device with a first coil; an electric vehicle which comprises a power battery assembly with a power battery; and a second wireless charging device which is provided with a second coil. The second coil is coupled with an electromagnetic field which is generated by the first coil and performs energy conversion. When the temperature of the power battery is larger than a first preset temperature and is lower than a second preset temperature, the second wireless charging device charges the power battery in a pulse charging mode, wherein the second wireless charging device charges the power battery in a first preset time period in the pulse charging mode. Afterwards the power battery performs energy feedback on the first wireless charging device in a second preset time period. The wireless charging system does not require heating in charging the power battery in a low-temperature environment, and furthermore a superfluous electric energy can be returned to an electric network. The invention further provides a wireless charging method for the electric vehicle.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a wireless charging system for electric vehicles and a wireless charging method for electric vehicles. Background technique [0002] The existing electric vehicle charging method is mainly wired charging, but the wired charging method has the following disadvantages: the mobile handling of the charging equipment and the lead wire of the power supply are too long, and the manual operation is cumbersome; the charging station occupies a large area and many exposed The charging cabinet and connected equipment movement and parking spaces will occupy more public area; in the process of manual operation, factors such as excessive wear and unsafety of equipment are prone to occur. [0003] Due to the above-mentioned deficiencies in the wired charging method, a more reasonable and safer wireless charging method has emerged as the times require. However, wireless charging also n...

AI Technical Summary

Problems solved by technology

[0002] The existing electric vehicle charging method is mainly wired charging, but the wired charging method has the following disadvantages: the mobile handling of the charging equipment and the lead wire of the power supply are too long, and the manual operation is cumbersome; the charging station occupies a large area and many exposed The charging cabinet, connected equipment and parking space will occupy more public area; in the process of manual operation, excessive wear and unsafe factors of the equipment are prone to occur

When the ambient temperature is too low, the charging and discharging performance of the internal battery of the electric vehicle will decline, the battery capacity will decrease, and the voltage will drop. Loss of electrical activity, and less power is charged into the battery in a low temperature environment

However, the traditional battery heating scheme requires additional equipment, takes a long time to heat up, and consumes more energy in the process of heating the battery by the heating equipment, which is contrary to the energy-saving concept of electric vehicles.

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