Control system of automobile power battery and control method

Abstract

The invention discloses a control system of an automobile power battery, which comprises a power battery and further comprises a bidirectional converter and a supercapacitor, wherein the power batteryis connected with the supercapacitor through the bidirectional converter, and the bidirectional converter is used for controlling joule heat generated during energy exchange between the power batteryand the supercapacitor to heat the power battery. The control system has the advantages that the repeated charging and discharging of the power battery are realized through the bidirectional conversion function of the bidirectional converter and the characteristic of high power density of the supercapacitor at low temperature, the charging and discharging processes are continuously carried out, and the heating efficiency and speed are high through the internal resistance of the battery. Meanwhile, the additionally arranged supercapacitor can store energy which cannot be recycled by the battery in the energy recycling process, so that the energy recycling rate is increased, and thus the endurance mileage of the electric automobile is increased.

Description

technical field [0001] The invention relates to the technical field of electric vehicle batteries, in particular to a control system for heating and energy recovery of electric vehicle power batteries. Background technique [0002] The power part of an electric vehicle is provided by a power battery, which is mainly a lithium battery. In a low-temperature environment, the discharge and charging performance of a lithium battery is limited, and heating is required to ensure performance. At present, the methods of using external heating for batteries include: fluid circulation heat exchange, resistance wire heating, electric heating film heating, etc., all of which have the problems of low heating efficiency and slow speed. At the same time, in the prior art, in order to increase the cruising range of the electric vehicle, the power battery will be recharged with energy recovery. However, in the energy recovery process of the prior art, under some conditions (such as when the p...

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Problems solved by technology

At present, the methods of using external heating for batteries include: fluid circulation heat exchange, resistance wire heating, electric heating film heating, etc., all of which have the problems of low heating efficiency and slow speed.

At the same time, in the prior art, in order to increase the cruising range of the electric vehicle, the power battery will be recharged with energy recovery. However, in the energy recovery process of the prior art, under some conditions (such as when the power battery power is greater than the set value), the energy recovery cannot be performed. It will cause a certain amount of energy waste, so that energy recovery and utilization cannot be performed well.

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