US 10,272,767 B1Granted

Dual loop liquid cooling of integrated electric drivetrain

AssigneesSF Motors, Inc., Chongqing Jinkang New Energy Vehicle Co., Ltd.

InventorsYifan Tang, Zhichun Ma

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Abstract

Provided herein are systems and methods for cooling an electric drivetrain of an electric vehicle. The electric drivetrain can include an inverter, a gearbox and a motor. A first cooling system can use ethylene glycol and water (EGW) based coolant, and can include an EGW coolant loop to distribute the EGW based coolant to remove heat from a cold plate of the inverter, a housing of the gearbox, and a housing of the motor. A second cooling system can use an oil based coolant, and can include an oil coolant loop to distribute the oil based coolant to remove heat from internal components and the housing of the gearbox, and to remove heat from internal components and the housing of the motor. The second cooling system can include an oil coolant pump to control a flow of the oil based coolant through the oil coolant loop.

Claims20

Dependent claims

An electric drivetrain system, comprising:

an electric drivetrain of an electric vehicle, comprising an inverter component, a gearbox component and a motor component;
a first cooling system that uses ethylene glycol and water (EGW) based coolant, the first cooling system comprising:
an EGW coolant loop to distribute the EGW based coolant through at least one of the inverter component, a housing of the gearbox component, and a housing of the motor component to remove heat from the inverter component, the housing of the gearbox component, and the housing of the motor component;
a second cooling system that uses oil based coolant, the second cooling system comprising:
an oil coolant loop to distribute the oil based coolant through at least one of internal components of the gearbox component and internal components of the motor component to remove heat from at least the internal components of the gearbox component, and from at least the internal components of the motor component;
and
an oil coolant pump to control a flow of the oil based coolant through the oil coolant loop;
and
a heat exchanger to transfer heat from the oil coolant loop to the EGW coolant loop, away from the electric drivetrain, to a vehicle cooling system having a radiator.

6 more elements

A dual motor drivetrain system, comprising:

a first drive unit and a second drive unit of an electric vehicle, each of the first drive unit and the second drive unit comprising:
an electric drivetrain that includes an inverter component, a gearbox component, and a motor component;
a first cooling system that uses ethylene glycol and water (EGW) based coolant, the first cooling system comprising an EGW coolant loop to distribute the EGW based coolant through at least one of a housing of the inverter component, a housing of the gearbox component, and a housing of the motor component to remove heat from the housing of the inverter component, the housing of the gearbox component, and the housing of the motor component;
a second cooling system that uses oil based coolant, the second cooling system comprising an oil coolant loop to distribute the oil based coolant through at least one of internal components of the gearbox component and internal components of the motor component to remove heat from at least the internal components of the gearbox component, and to remove heat from at least internal components of the motor component;
and
a heat exchanger to transfer heat from the oil coolant loop to the EGW coolant loop, away from the electric drivetrain, to a vehicle cooling system having a radiator;
and
the EGW coolant loop of the first drive unit and the EGW coolant loop of the second drive unit connected within a coolant network to distribute the EGW based coolant.

5 more elements

Dependencies are inferred from the claim text.