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Electric vehicle battery heating method

A technology for battery heating and electric vehicles, which is applied to electric vehicles, secondary batteries, battery/fuel cell control devices, etc., and can solve the problems of low heating power and heating efficiency

Active Publication Date: 2019-07-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a battery heating method for electric vehicles to solve the problems of low heating power and heating efficiency of traditional battery packs.

Method used

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Embodiment Construction

[0059] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific implementation disclosed below.

[0060] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to"...

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Abstract

The invention provides an electric vehicle battery heating method. According to the electric vehicle battery heating method, a first controller controls opening and closing of three bridge arms of aninverter circuit to complete repeated driving and braking of a three-phase motor; energy output and energy recovery of a power supply unit are realized by repeated driving and braking of the three-phase motor, thus the power supply unit is polarized, and thus controllable temperature rising of a battery of the power supply unit is realized; a maximum working current of a power switching device inthe inverter circuit and a maximum working current of the three-phase motor are high; the electric vehicle battery heating method can realize high power heating, and the heating efficiency is effectively improved; and the power switching device is used as a control element, and the three-phase motor is used as an energy storage element. A special heating element does not need to be added in the process of battery heating, and thus the power system cost of an electric vehicle is reduced.

Description

technical field [0001] The present application relates to the field of new energy vehicles, in particular to a method for heating batteries of electric vehicles. Background technique [0002] The characteristics of lithium batteries decay at low temperatures. In winter or in cold regions, the battery must be heated first during the use of electric vehicles in order to improve the driving range and charging performance of electric vehicles. The current battery pack heating scheme includes installing heating elements inside the battery pack and raising the battery temperature through external heating. This way increases the battery cost and the heating efficiency and heating power are not high. [0003] In the existing patent, the battery pack heating solution also includes external heating of the battery through the charger / charging pile, but this solution is only available when the electric vehicle is charging, and cannot meet the low-temperature shelving start-up problem ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/27H01M10/615H01M10/625
CPCB60L58/27H01M10/615H01M10/625Y02E60/10Y02T10/70Y02T10/72
Inventor 李亚伦郭东旭欧阳明高卢兰光杜玖玉李建秋
Owner TSINGHUA UNIV
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