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A control method and system for low-temperature charging of pure electric vehicles

A control method and pure electric vehicle technology, applied in electric vehicle charging technology, battery/fuel cell control devices, electric vehicles, etc., can solve the limitations of pure electric vehicle promotion, low power battery temperature, and the inability of vehicles to perform DC fast charging, etc. problem, achieve the effect of shortening the charging time at low temperature and improving adaptability

Active Publication Date: 2022-04-08
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 control method and system for low-temperature charging of pure electric vehicles
  • A control method and system for low-temperature charging of pure electric vehicles

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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 control method and system for low-temperature charging of a pure electric vehicle, which includes: the DC relay of the charger of the DC charging pile is closed, the charger is ready to enter the charging process; and it is judged whether the BMS receives the charging from the charger. If the message is ready, BRO stops sending; BMS disconnects the main positive contactor and main negative contactor of the power battery pack; BMS sends the battery charging demand; judges whether the DClink voltage is greater than or equal to 95% of the current voltage of the power battery, and the DC Whether the output current in the charging state CCS message fed back by the charging pile satisfies the request, if so, directly pull in the main positive and main negative contactors; otherwise, judge whether the output current of the charging pile is 0A within 5S, and if so, perform pre-charging After the high voltage, the main negative contactor and the pre-charge contactor are closed; after the high voltage is applied, the BMS sends BCL and BCS to the charger on the charging pile to start charging. The invention can quickly raise the power battery to the temperature range where fast charging can be performed, without repeatedly connecting the 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 Patents(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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