Vehicle charger, electric vehicle, charging and discharging system and method

By employing a DC-DC conduction mode charging and discharging control method between electric vehicles, direct DC power transfer is achieved, solving the low efficiency problem caused by multi-stage conversion in existing technologies, improving charging efficiency and range, and making it suitable for existing V2V charging cables.

CN114629199BActive Publication Date: 2026-06-09SUNGROW POWER SUPPLY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SUNGROW POWER SUPPLY CO LTD
Filing Date
2022-02-16
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing on-board chargers require multiple conversion circuits when charging and discharging between electric vehicles, resulting in low conversion efficiency. This is especially true when the on-board battery has low energy, which affects the driving range and charging speed.

Method used

The charging and discharging control method using DC conduction mode allows the on-board charger to directly convert the battery voltage to DC and output it when it receives a DC discharge command. When it receives a charging request command, it detects that the voltage at the connection port is a DC voltage and performs DC conversion to charge the battery, eliminating the AC conversion process.

Benefits of technology

It improves the charging and discharging efficiency between electric vehicles, reduces the number of energy conversion stages, increases charging speed and driving range, and requires no additional interface design, making it compatible with existing V2V charging cables.

✦ Generated by Eureka AI based on patent content.

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    Figure CN114629199B_ABST
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Abstract

The application provides a vehicle-mounted charger, an electric vehicle, a charging and discharging system and a method. The charging and discharging control method is applied to the charging and discharging system, the charging and discharging system comprises the electric vehicle, a vehicle-mounted charger arranged on the electric vehicle and a battery, the vehicle-mounted charger has a battery end for connecting the battery and a connecting port for connecting a charging cable, and the charging and discharging control method comprises the following steps: when a direct current discharging instruction is received, the vehicle-mounted charger works in a direct current conduction mode to convert the voltage of the battery into direct current and then output the direct current through the connecting port; when a charging request instruction is received, the vehicle-mounted charger detects the parameters of the voltage connected to the connecting port, and when the voltage connected to the connecting port is determined as a direct current voltage, the vehicle-mounted charger enters the direct current conduction mode to convert the direct current voltage connected to the connecting port into a direct current voltage with a preset voltage value and then output the direct current voltage to the battery to charge the battery. The application improves the charging and discharging efficiency between the electric vehicles.
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