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Power battery heating method and device, chip system and electric vehicle

A power battery and heating method technology, applied in electric vehicles, battery/fuel cell control devices, charging stations, etc., can solve problems such as low heating efficiency of power batteries, and achieve the effects of increasing temperature, increasing charging time, and increasing charging current

Active Publication Date: 2022-08-02
HUAWEI ELECTRICAL POWER TECH CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present application provides a power battery heating method, device and electric vehicle to help solve the problem of low power battery heating efficiency in the prior art

Method used

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  • Power battery heating method and device, chip system and electric vehicle
  • Power battery heating method and device, chip system and electric vehicle
  • Power battery heating method and device, chip system and electric vehicle

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Embodiment Construction

[0088] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0089] It should be clear that the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0090] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. As used in the embodiments of this application and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

[0091] It should be unders...

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Abstract

The power battery heating method and device, the chip system and the electric vehicle are applied to the electric vehicle and comprise the steps that when it is determined that a power battery is heated, the first pulse frequency and the first discharge duty ratio are obtained; the first discharge duty ratio is greater than 0.5; according to the first pulse frequency and the first discharge duty ratio, a first pulse width modulation signal of each switch in the three-phase bridge arm is generated, and on-off of each switch in the three-phase bridge arm is controlled according to the first pulse width modulation signal of each switch in the three-phase bridge arm; when the collected current target current reaches a preset current threshold value, obtaining a second pulse frequency and a second discharge duty ratio; the second discharge duty ratio is not greater than 0.5; and generating a second pulse width modulation signal of each switch in the three-phase bridge arm according to the second pulse frequency and the second discharge duty ratio, and controlling the on-off of each switch in the three-phase bridge arm according to the second pulse width modulation signal of each switch in the three-phase bridge arm. The heating efficiency of the power battery is improved.

Description

technical field [0001] The present application relates to the technical field of electric vehicles, and in particular to a power battery heating method, device, chip system and electric vehicle. Background technique [0002] With the gradual improvement of people's awareness of environmental protection, more and more people tend to choose gasoline-electric hybrid vehicles or pure electric vehicles powered by on-board batteries instead of ordinary vehicles powered by traditional internal combustion engines. The complex temperature environment faced by vehicles during driving and parking puts forward higher requirements on the temperature control of the on-board battery of a hybrid vehicle or a pure electric vehicle. Specifically, the lithium precipitation phenomenon will occur when the power battery is charged and discharged at low temperature, which will lead to the attenuation of the power battery capacity and even lead to potential safety hazards of the power battery. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/27B60L53/00
CPCB60L58/27B60L53/00B60L2240/54B60L2240/545B60L2240/549Y02T10/70
Inventor 李迎冯小军陈振兴
Owner HUAWEI ELECTRICAL POWER TECH CO LTD
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