Low temperature heating device for lithium ion battery and electric vehicle

Abstract

The invention relates to a low-temperature heating device for a lithium ion battery, which includes a lithium ion battery, two sets of power devices of the motor controller itself and two winding inductances of the motor itself, and also includes the power device of the motor controller and the negative electrode of the lithium ion battery The heating control circuit provided between, the lithium-ion battery, the two sets of power devices of the motor controller, the two winding inductances of the motor and the heating control circuit are sequentially connected to form a loop, and the heating control circuit includes capacitive elements, A power device and a switching device are added, the capacitive element and the added power device are connected in series and then the switching device is connected in parallel; the switching device and the additional power device are respectively turned on and off, so that the capacitive element and the winding inductance form The LC oscillator circuit generates high-frequency alternating current, which generates heat inside the battery according to Joule's law, thereby heating the inside of the battery. The device of the invention can heat quickly and efficiently, and has uniform rate and good effect.

Description

technical field [0001] The invention relates to the technical field of battery heating, in particular to a low-temperature heating device for a lithium-ion battery and an electric vehicle including the device. Background technique [0002] In recent years, with the continuous advancement of social science and technology, and the great emphasis on energy development and environmental protection, the new energy automobile industry has been vigorously developed, becoming an important strategic measure for the rise of China's automobile industry and to deal with the global oil crisis and environmental pollution. Electric vehicles use electric energy instead of fossil fuels such as petroleum as power to get rid of dependence on petroleum while reducing environmental pollution, which is an efficient solution for green transportation. Therefore, new energy vehicles, especially electric vehicles, are gradually gaining a broad market and slowly entering every household. [0003] In ...

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Problems solved by technology

[0010] The present invention aims at defects such as the need to add complex external equipment to the existing lithium-ion battery low-temperature heating device, large energy loss, poor heating uniformity, and the need to change the internal structure of the lithium-ion battery, and provides a low-temperature heating device for the lithium-ion battery. The device is effective Using part of the power devices of the electric motor controller inherent in the electric vehicle and part of the winding inductance inside the motor, simply add capacitive components, power devices and switching devices to form a heating control circuit, which can control the capacitive components and winding inductance to form LC The oscillating circuit generates high-frequency alternating current, which continuously flows through the lithium-ion battery, and then realizes the internal heating of the lithium-ion battery in a low-temperature environment. Extremely strong and other advantages

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