A method for controlling low-temperature heating of lithium-ion batteries

Abstract

A low-temperature heating control method for a lithium-ion battery. Firstly, a capacitive element is selected, and then the capacitive element is connected in series with an additional power device, and then a switching device is connected in parallel to form a heating control circuit, and then the heating control circuit is connected with the lithium-ion battery, The two sets of power devices of the motor controller itself and the two-phase winding inductance of the motor itself are connected in turn to form a loop, and then the charging and discharging of the capacitive components and the magnetic energy storage of the two-phase winding inductance are controlled by switching devices and adding power devices on and off. And release, so that the capacitive element and the winding inductance form an LC oscillating circuit, generate high-frequency alternating current, and then generate heat inside the lithium-ion battery based on Joule's law, and can repeat the heating process to achieve continuous oscillation and heat generation until The lithium-ion battery is heated to the target temperature. This method can be realized only by adding simple elements on the basis of the inherent structure of the electric vehicle, and has good heating effect, high thermal efficiency and low use 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 large energy consumption in 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 Repeatedly charge and boost the capacitive element many times 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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