Intelligent flexible preheating method and system for power battery of electric vehicle in cold region

A technology for power batteries and electric vehicles, which is applied in the field of intelligent and flexible preheating methods and systems for electric vehicle power batteries in cold regions, and achieves the effects of high reliability, good temperature uniformity and strong robustness.

Active Publication Date: 2021-09-03
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for AC preheaters, a critical but challenging issue is how to control the preheating current to meet the preheating speed without damaging the battery

Method used

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  • Intelligent flexible preheating method and system for power battery of electric vehicle in cold region
  • Intelligent flexible preheating method and system for power battery of electric vehicle in cold region
  • Intelligent flexible preheating method and system for power battery of electric vehicle in cold region

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0046] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0047] It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0048] li...

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Abstract

The invention provides an intelligent flexible preheating method and system for a power battery of an electric vehicle in a cold region. The method comprises the steps: acquiring the temperature information of the battery, calculating the frequency needed by an AC preheater according to the historical information and the target temperature, and preheating the battery through the AC preheater according to the needed frequency. The calculation principle of the frequency required by the AC preheater is as follows: if the target preheating rate is larger than the preheating rate of the previous period, the preheating rate of the battery is increased, and if the target preheating rate is smaller than the preheating rate of the previous period, the preheating rate of the battery is decreased until the error converges to be zero. According to the method, the magnitude of the alternating current can be adjusted in a segmented mode according to the previous period and the needed preheating rate, the uniformity of the internal temperature of the battery is good, and good robustness and reliability are achieved.

Description

technical field [0001] The invention belongs to the technical field of battery control, and in particular relates to an intelligent and flexible preheating method and system for electric vehicle power batteries in cold regions. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The battery of a new energy vehicle is the key to the entire power system. However, in cold climates, the energy and power characteristics of lithium-ion batteries will be severely attenuated, affecting the cycle life and safety of the battery. In order to improve the low-temperature performance of the power battery, it is necessary to preheat the battery. [0004] Existing battery low temperature preheating technology can be divided into internal preheating method and external preheating method. The external preheating method uses an external heat source to achieve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/615H01M10/625H01M10/633H01M10/637B60L58/27
CPCH01M10/615H01M10/625H01M10/633H01M10/637B60L58/27Y02T10/70
Inventor 商云龙陈桂成张承慧张奇段彬殷培鑫
Owner SHANDONG UNIV
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