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A pure electric vehicle low-temperature charging control method and system

A control method and technology for pure electric vehicles, applied in electric vehicle charging technology, battery/fuel cell control devices, electric vehicles, etc., can solve the problem of low power battery temperature, limited promotion of pure electric vehicles, and vehicles that cannot perform DC fast charging, etc. problems, to achieve the effect of improving adaptability and shortening low-temperature charging time

Active Publication Date: 2019-06-14
帝亚一维新能源汽车有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the severe cold environment, due to the low temperature of the power battery, the vehicle cannot perform DC fast charging, which seriously limits the promotion of pure electric vehicles.

Method used

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  • A pure electric vehicle low-temperature charging control method and system
  • A pure electric vehicle low-temperature charging control method and system

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] In the present invention, the meanings of specific terms are:

[0017] BMS: battery management system;

[0018] CRO: The charger is ready message, and the charging configuration is completed;

[0019] BRO: BMS ready message, high voltage establishment completed;

[0020] BCL: battery charging demand;

[0021] BCS: battery charge status;

[0022] CCS: charger charging state;

[0023] DClink: The rear terminal voltage of the main contactor of the power battery pack.

[0024] like figure 1 As shown, the present invention provides a control method for low-temperature charging of pure electric vehicles, which includes the following steps:

[0025] 1) The DC relay of the charger of the DC charging pile is closed, the charger is ready for the message, the charging configuration is completed, and the electric vehicle is ready to enter the chargi...

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Abstract

The invention relates to a pure electric vehicle low-temperature charging control method and system, and the method comprises the following steps: enabling a DC relay of a charger of a DC charging pile to be closed, enabling the charger to prepare a ready message, and enabling the charger to enter a charging process; judging whether a BMS receives a charging ready message of the charger or not, and if yes, stopping sending BRO; enabling the BMS to disconnect a main positive contactor from a main negative contactor of a power battery pack; enabling the BMS to send a battery charging demand; judging whether a DClink voltage is greater than or equal to 95% of the current voltage of the power battery and whether the output current in a charging state CCS message fed back by the DC charging pile meets the request or not, and if so, directly attracting the main positive contactor and the main negative contactor; otherwise, judging whether the current outputted by the charging pile within 5Sis 0A or not, if so, carrying out pre-charging of high-voltage, and then attracting the main negative contactor with a pre-charging contactor; finishing high-voltage charging, enabling the BMS to senda BCL and a BCS to the charger on the charging pile, and starting charging. According to the method and system, the power battery can be rapidly increased to a temperature range where rapid chargingcan be carried out without repeatedly connecting a charging gun.

Description

technical field [0001] The invention relates to the technical field of electric vehicle control, in particular to a control method and system for low-temperature charging of pure electric vehicles. Background technique [0002] At present, in the severe cold environment, due to the low temperature of the power battery, the vehicle cannot perform DC fast charging, which seriously limits the promotion of pure electric vehicles. How to improve the low temperature adaptability of pure electric vehicles and shorten the low temperature charging time by more than half. Contents of the invention [0003] In view of the above problems, the object of the present invention is to provide a control method and system for low-temperature charging of pure electric vehicles, which can quickly raise the power battery to a temperature range where fast charging can be performed for fast charging without repeatedly connecting the charging gun. [0004] In order to achieve the above object, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L53/66B60L58/27
CPCY02T90/16Y02T10/7072Y02T10/70Y02T90/12
Inventor 周道辉辛明李佳晓
Owner 帝亚一维新能源汽车有限公司
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