Vehicle, energy conversion device and control method thereof

Abstract

The technical scheme of the invention provides a vehicle, an energy conversion device and a control method thereof. The energy conversion device comprises a first switch module, a second switch module, a bus capacitor, a bridge arm converter, a motor winding and a third switch module; the first switch module, the motor winding, a bridge arm converter and the bus capacitor are applied to a motor driving circuit and a heating circuit, so that the output torque of a motor can be realized, and the internal resistance of a battery can be heated; newly added circuit elements are avoided, so that a circuit structure is simplified; the bus capacitor participates in the charging and discharging process in the heating circuit, so that a large amount of current is prevented from passing through the bus capacitor when a battery pack discharges, and the current passing through the battery pack drops significantly, and the heating efficiency of the battery pack is improved; the connection between the third switch module and the second switch module is arranged to replace the connection between the third switch module and the battery pack, so that a wiring harness distance is shortened, and the wiring harness use cost is finally 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 significant

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