Charging method and device for vehicle and charging pile

Abstract

The invention discloses a charging method for a vehicle. The charging method comprises the following steps that whether a charging pile is in the heating mode or not is judged; if the charging pile is in the heating mode, a power battery is heated after a heating relay is closed; and after heating is completed, if the heating relay is disconnected and a quick-charging cathode relay and a fast-charging negative relay are closed, the charging pile is controlled to charge the power battery. According to the charging method for the vehicle, detecting for voltage at both ends of the power battery is not required when the power battery is heated, the power battery is directly charged, so that safety of charging is improved, and reliability of charging is effectively guaranteed. The invention also discloses a charging device of the vehicle and the charging pile.

Description

technical field [0001] The invention relates to the field of vehicle technology, in particular to a vehicle charging method, device and charging pile. Background technique [0002] In the related technology, when charging the battery in a low temperature environment, the battery is first heated, but at the same time when the heating relay is closed, the fast charging positive relay and the fast charging negative relay need to be closed, so that the detected voltage at both ends of the battery is the same as The battery voltage sent by the message is the same, so that during the charging phase, the battery management system controls the requested voltage and current to achieve the purpose of heating and charging the battery, which not only plays a heating role, but also avoids the failure of the charging pile. [0003] However, after the charging pile outputs current and the fast charging positive relay and the fast charging negative relay are disconnected, there will be devi...

AI Technical Summary

Problems solved by technology

[0003] However, after the charging pile outputs current and the fast charging positive relay and the fast charging negative relay are disconnected, there will be deviations in voltage acquisition and charging pile output, which will easily lead to a deviation between the battery terminal voltage and the charging pile output voltage. If the battery terminal If the voltage>the output voltage of the charging pile, the battery will discharge, causing the current to flow into the internal resistance wire and the charging pile. When the temperature of the lower battery does not reach the charging temperature, charging is not allowed, so there are potential safety hazards in the above situations

In addition, if the positive relay and the negative relay are not disconnected after the charging pile outputs current, the above situation will continue until the heating process is completed, and the safety and reliability of charging cannot be effectively guaranteed.

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