Stator iron core, shell, motor cooling system of electric vehicle and electric vehicle

Abstract

The invention provides a stator iron core, a shell, a motor cooling system of an electric vehicle and the electric vehicle. The cooling system comprises a power device, the stator iron core, an iron core cooling oil channel used for conveying cooling oil to the stator iron core, and a coil cooling oil channel. The coil cooling oil channel is provided with a first oil outlet, and the first oil outlet is located in the end of the stator iron core. The iron core cooling oil channel and the coil cooling oil channel are sequentially communicated, so that cooling oil enters the iron core cooling oilchannel firstly and then enters the coil cooling oil channel. The iron core cooling oil channel extends in the circumferential direction of the stator iron core, the coil cooling oil channel extendsin the axial direction of the stator iron core, and the power device drives cooling oil to enter the iron core cooling oil channel from the oil inlet, flow through the iron core cooling oil channel, enter the coil cooling oil channel from an oil passing opening and flow back to an oil return groove from the first oil outlet.

Description

technical field [0001] The present application relates to the technical field of motor vehicle equipment, in particular to a stator core, a casing, a motor cooling system of an electric vehicle and the electric vehicle. Background technique [0002] With the development of electric vehicles, the demand for miniaturization of the motor in the powertrain is increasing. Specifically, the power density of the motor needs to be increased from 5.7kW / L at the current stage to 50kW / L. With the increase of power density, Improving the heat dissipation efficiency of the motor is a technical problem to be solved urgently. [0003] In the prior art, water-cooling heat dissipation technology is usually used to dissipate heat from the motor. However, the power density of water-cooling heat dissipation is low, and because the cooling water has no insulation, it cannot directly contact the motor components, resulting in a large thermal resistance of the water-cooling link. In addition, wat...

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Problems solved by technology

In the oil-cooling heat dissipation technology adopted in the prior art, the flow channels for heat dissipation of the stator core of the motor and the end of the stator coil are processed in parallel, that is, part of the cooling oil pumped out by the oil pump is used to dissipate heat for the stator core. One part is used to dissipate heat from the end of the stator coil, so the flow rate of the cooling oil in the two parts is relatively low, and the cooling effect is poor; The cooling oil flowing out of the port flows down by gravity, which may easily lead to uneven oil distribution, and different cooling effects in different areas, which may easily lead to local overheating

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