Low-temperature heating device for lithium-ion battery and electric car

Abstract

The invention relates to a low-temperature heating device for a lithium-ion battery; the low-temperature heating device comprises the lithium-ion battery, two power devices of a motor controller and two winding inductors of a motor; the low-temperature heating device also comprises a heating control circuit arranged between the power devices of the motor controller and a negative electrode of thelithium-ion battery. The lithium-ion battery, the two power devices of the motor controller, the two winding inductors of the motor and the heating control circuit are successively connected to form acircuit. The heating control circuit comprises a capacitive element, an additional power device and a switching device. The capacitive element and the additional power device are connected in seriesand then connected in parallel with the switching device. An LC oscillating circuit is formed by the capacitive element and the winding inductors through opening and closing of the switching device and the additional power device respectively, and the high-frequency alternating current is generated. According to Joule's law, the heat is generated in the battery, and then the interior of the battery is heated. The device can be used for quickly and efficiently heating, and has uniform speed 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 ...

AI Technical Summary

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

Images