Battery charging control method of pure electric vehicle

A pure electric vehicle and battery charging technology, which is applied in the field of battery charging control of pure electric vehicles, can solve problems such as increasing safety hazards, damaging power batteries and charging circuit components, and generating sparks, so as to improve safety and ensure charging efficiency and safety effect

Pending Publication Date: 2020-12-15
YIBIN COWIN AUTO CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing technology, when judging that the power battery is allowed to be charged, directly closing the main positive and main negative relays will cause a large voltage difference between the two ends of the rela

Method used

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  • Battery charging control method of pure electric vehicle
  • Battery charging control method of pure electric vehicle
  • Battery charging control method of pure electric vehicle

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Embodiment Construction

[0024] The specific implementation of the present invention will be described in further detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions of the present invention.

[0025] figure 1 The schematic structural diagram of the battery charging control system of the pure electric vehicle provided by the embodiment of the present invention, for the convenience of description, only shows the parts related to the embodiment of the present invention.

[0026] The system includes: a power battery pack, a battery management system BMS connected to the power battery pack in communication, the battery management system BMS and the vehicle controller VCU, HVCM (three-in-one power supply assembly, referred to as HVCM) The circuit diagram of the power battery pack is as follows figure 2 As shown, F1~F3 are fus...

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Abstract

The invention discloses a battery charging control method for a pure electric vehicle, and the method specifically comprises the following steps that S1, a battery management system BMS controls a main negative relay to be closed based on a charging flag bit, and an HVCM controls a vehicle-mounted charger OBC to enter a current mode, i.e., controls the vehicle-mounted charger OBC to carry out thecharging at a constant current; and S2, the battery management system BMS controls the main negative relay to be disconnected based on the charging forbidding flag bit, and the HVCM controls the OBC to enter a voltage mode, that is to say, the output voltage of the OBC is the same as the output voltage of the power battery. When the main negative relay is disconnected, the OBC works in a voltage mode, the voltage of the OBC is kept consistent with the voltage of the power battery pack, and the situation that when charging is started, voltage difference exists between the power battery and theOBC, so that the main negative relay is closed to generate electric arcs, and safety is affected is avoided; When the main negative relay is closed, the OBC works in a constant-current mode, and the maximum charging efficiency and safety are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and more specifically, the invention relates to a battery charging control method of a pure electric vehicle. Background technique [0002] At present, the control method for charging and powering on the power battery of pure electric vehicles is mainly for the VCU to judge whether the power battery is under the allowable charging condition through the state of the vehicle. If so, close the main positive and main negative relays to charge and power on the power battery. Then the main positive and main negative relays are prohibited from closing, waiting for the next charging and power-on command. In the prior art, when judging that the power battery is allowed to be charged, directly closing the main positive and main negative relays will cause a large voltage difference between the two ends of the relays, generate sparks, and damage the relays. Instantaneous high voltage and strong cu...

Claims

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Application Information

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IPC IPC(8): B60L58/10B60L58/27B60L53/20B60L53/14
CPCB60L58/10B60L58/27B60L53/20B60L53/14Y02T10/70Y02T10/7072Y02T90/14
Inventor 郭军曾彬周映双李果何伟
Owner YIBIN COWIN AUTO CO LTD
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