Vehicle, energy conversion device and control method thereof

Abstract

The technical solution of the present application provides a vehicle, an energy conversion device and a control method thereof. The energy conversion device includes a first switch module, a second switch module, a bus capacitor, a bridge arm converter, a motor winding, and a third switch module. A switch module, motor winding, bridge arm converter, and bus capacitor are used in the motor drive circuit and heating circuit, which can not only realize the output torque of the motor, but also realize the heating of the internal resistance of the battery, avoid adding new circuit components, and simplify the circuit structure , and by making the bus capacitor participate in the charging and discharging process in the heating circuit, it avoids a large amount of current passing through the bus capacitor when the battery pack is discharged, so that the current flowing through the battery pack is greatly reduced, and the heating efficiency of the battery pack is improved. And by setting the connection between the third switch module and the second switch module instead of the connection between the third switch module and the battery pack, the distance of the wire harness is shortened, and finally the cost of using the wire harness is saved.

Description

technical field [0001] The present application relates to the technical field of vehicles, in particular to a vehicle, an energy conversion device and a control method thereof. Background technique [0002] With the widespread use of new energy sources, battery packs can be used as power sources in various fields. Depending on the environment in which the battery pack is used as a power source, the performance of the battery pack will also be affected. For example, the performance of a battery pack in a low temperature environment will be reduced to a greater extent than that at normal temperature. For example, at zero temperature, the discharge capacity of the battery pack will decrease as the temperature decreases. Under the condition of -30°C, the discharge capacity of the battery pack is basically 0, making the battery pack unusable. In order to be able to use the battery pack in a low temperature environment, it is necessary to preheat the battery pack before using i...

AI Technical Summary

Problems solved by technology

However, the existing technology has the following problems: due to the existence of the bus capacitor C1, a large amount of current will pass through the bus capacitor C1 when the battery pack 103 is discharging during the heating circuit operation, so that the current flowing through the battery pack drops significantly, and the battery pack 103 is discharged. The heating rate will also be severely slowed down, in addition, the distance between the battery pack and the motor winding is relatively large, and when the battery pack is connected to the motor winding, a large number of wire harnesses will be used, resulting in high cost

Images