Low-temperature heating control method for lithium ion battery

Abstract

A low-temperature heating control method for a lithium ion battery includes the following steps: first selecting a capacitive component; connecting the capacitive component and an additional power device in series, and then connecting a switch device in parallel to form a heating control circuit; then sequentially connecting the heating control circuit with the lithium ion battery, two sets of power devices of a motor controller body, and two-phase winding inductance of a electromotor to form a loop; and controlling charge and discharge of the capacitive component and magnetic energy storage and release of the two-phase winding inductance by opening and closing of the switch device and the additional power device to enable an LC oscillating circuit to be formed between the capacitive element and the winding inductance, generating a high-frequency alternating current, generating heat inside the lithium ion battery based on a joule law, and allowing to repeatedly operating the heating process to achieve continuous oscillation and continuous heat production until heating the lithium ion battery to a target temperature. The low-temperature heating control method for the lithium ion battery can be achieved by only adding a simple component to an inherent structure of an electric vehicle, and has the characteristics of good heating effect, high thermal efficiency and low usage cost.

Description

technical field [0001] The invention relates to the technical field of battery heating, in particular to a method for controlling low-temperature heating of a lithium-ion battery. Background technique [0002] The battery heating method is a very important technology in the field of battery heating technology and even in the field of electric vehicles, and the quality of the lithium-ion battery heating method directly affects the comfort, operational stability and safety of electric vehicles. At present, there are many new technologies and methods that have been applied to the heating of lithium-ion batteries, but due to their own performance defects, they have not been widely used in the field of electric vehicles, such as: adding insulation sleeves to the outside of lithium-ion batteries, and insulating them through insulation materials. heat preservation, but this only plays a role of heat insulation, and does not play a role in heating; there is also the use of infrared ...

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the problems of cumbersome operation, unsatisfactory heating effect and high energy consumption of the existing lithium-ion battery heating method, and provides a low-temperature heating control method for lithium-ion batteries. The heating control circuit is set in the loop, and then the heating The switching device in the control circuit and the additional power device are turned on and off to control the capacitive element and the winding inductance to form an LC oscillation circuit, which continuously generates high-frequency alternating current to flow through the lithium-ion battery to realize the heating of the lithium-ion battery. At the same time, it can Charge and boost the capacitive element repeatedly to achieve continuous oscillation and overcome attenuation until the lithium-ion battery is heated to the target temperature. This method has low cost, high thermal efficiency and uniform heating rate, and can effectively reduce energy consumption. It is extremely practical

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