Power battery heating method and device of electric vehicle

Abstract

The embodiments of the invention disclose a power battery heating method and device of an electric vehicle. The power battery heating method includes the steps that when a fast heating instruction isreceived, a first motor control instruction containing a direct axis current set value and a quadrature axis current set value is generated, wherein the direct axis current set value is zero and the quadrature axis current set value is greater than zero; a motor is controlled into a motor stalling state based on the first motor control instruction; and a battery water circuit containing a power battery is in series connection with a motor water circuit containing the motor to introduce motor locked-rotor heat into the battery water circuit. According to the embodiments, active motor stalling can be realized, and the motor stalling heat is used for heating the power battery, so that the heating speed of the battery can be improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of electric vehicles, in particular to a method and device for heating a power battery of an electric vehicle. Background technique [0002] Energy shortages, oil crises and environmental pollution are intensifying, which have a huge impact on people's lives and are directly related to the sustainable development of the country's economy and society. All countries in the world are actively developing new energy technologies. As a new energy vehicle with reduced oil consumption, low pollution, and low noise, electric vehicles are considered to be an important way to solve the energy crisis and environmental degradation. Hybrid vehicles take into account the advantages of pure electric vehicles and traditional internal combustion engine vehicles at the same time. On the premise of meeting the requirements of vehicle power and mileage, it effectively improves fuel economy and reduces ...

AI Technical Summary

Problems solved by technology

However, this is limited to the waste heat generated during normal operation of the motor, which is generated as the vehicle is driven and is as unpredictable as the driving conditions of the vehicle

In particular, when the battery needs to be heated in a low-temperature environment in winter, the motor generates less waste heat when it is just started, which cannot meet the heating demand of the battery.

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