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Quick-charging heating control method for electric automobile at low temperature

A technology for heating control and electric vehicles, applied in electric vehicle charging technology, electric vehicles, battery/fuel cell control devices, etc., can solve problems such as inability to achieve fast charging, shorten fast charging and charging time, and reduce the use of low-temperature charging Time, the effect of improving the car experience

Pending Publication Date: 2022-02-01
YIBIN COWIN AUTO CO LTD
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AI Technical Summary

Problems solved by technology

However, with the development of fast charging technology, the charging time of automobile lithium batteries is also shortened. However, when low temperature occurs, limited by the inherent characteristics of the battery, it cannot achieve fast charging. At this time, heating the battery can achieve fast charging. requirements, but how to realize charging control and heating control under fast charging, there is no document in the prior art

Method used

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  • Quick-charging heating control method for electric automobile at low temperature

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Embodiment Construction

[0017] The specific implementation manner of the present invention will be described in further detail below by describing the best embodiment with reference to the accompanying drawings.

[0018] The components involved in this heating strategy are: battery management system (BMS), three-in-one controller (HVCM), vehicle controller (VCU), fast charging charging pile

[0019] The specific heating strategy is described as follows:

[0020] 1. Plug in the fast charging charging cable, after the HVCM detects the CC2 signal, it immediately outputs a 12V signal to wake up the VCU and BMS;

[0021] 2. The VCU outputs a high-voltage power-on command, and the BMS detects the high-voltage power-on command, and starts pre-charging. After the pre-charging is completed, the main positive and main negative relays are closed;

[0022] 3. The BMS detects the lowest temperature of the battery, and judges the range of the temperature. There are three ranges: ① charging without heating (T>T2);...

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Abstract

The invention discloses a quick-charging heating control method for an electric automobile at low temperature, which comprises the following steps: detecting the temperature of a battery after the quick-charging preparation of the automobile is finished, and judging the temperature state of the battery according to the temperature of the battery, wherein the temperature state of the battery comprises a charging-only non-heating temperature state, a heating-while-charging temperature state and a heating-only non-charging temperature state; and allowing a BMS to correspondingly control the starting states of heating and charging of the battery according to the temperature state of the battery. The method has the advantages that the temperature state of the battery is set, three temperature state intervals are set, and different temperature control strategies are set for different temperature intervals, so that the quick-charging time is shortened in a low-temperature environment, and the automobile use experience of a user is improved; in a low-temperature environment, the low-temperature charging service time of the lithium battery is shortened, and battery attenuation caused by low temperature is reduced as much as possible.

Description

technical field [0001] The invention relates to the field of charging control of lithium batteries of electric vehicles, in particular to a method for controlling fast charging and heating of electric vehicles at low temperatures. Background technique [0002] With the continuous popularization of electric vehicles, the use environment of on-board lithium-ion batteries is becoming more and more complicated, especially in low-temperature environments. Due to the low-temperature characteristics of existing batteries, the allowable charging current of batteries is limited very small, resulting in the use of The charging time during fast charging is greatly extended, which affects the customer's car experience. At the same time, if it is used in a low temperature environment for a long time, it will also cause serious attenuation of the battery cell and affect the battery life. In the prior art, when the lithium-ion battery is at a low temperature, it will be heated to increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/24B60L58/27B60L53/62
CPCB60L58/24B60L58/27B60L53/62Y02T10/70Y02T10/7072Y02T90/12
Inventor 黄介潘中正周映双张广阵邹翔
Owner YIBIN COWIN AUTO CO LTD
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