Thermal management system for battery pack and thermal management system for electric vehicle

1. A thermal management system for a battery pack of an electric vehicle, comprising:

a thermal management device ( 11 ) for the battery pack, a processor ( 12 ), a solenoid valve network ( 13 ) connected to the thermal management device ( 11 ) for the battery pack, and an external cooling system ( 2 );

characterized in that

the thermal management device ( 11 ) for the battery pack comprises:

a first heat exchanger ( 111 ), wherein a first end of the first heat exchanger ( 111 ) is connected to the second valve port of the second solenoid valve ( 132 ), and a second end of the first heat exchanger ( 111 ) is connected to a first end of a second heat exchanger ( 112 ) and the second valve port of the third solenoid valve ( 133 );

the second heat exchanger ( 112 ), wherein a second end of the second heat exchanger ( 112 ) is connected to a first end of a first water pump ( 113 );

the first water pump ( 113 ), wherein a second end of the first water pump ( 113 ) is connected to the second valve port of the fourth solenoid valve ( 134 ); and

a first cooling system ( 114 ), wherein the first cooling system ( 114 ) is connected to the second heat exchanger ( 112 ) and is configured to absorb heat transferred by the second heat exchanger ( 112 ), so as to cool the battery pack;

the thermal management system further comprises an external port of the solenoid valve network ( 13 ) is connected to the external cooling system ( 2 );

wherein the solenoid valve network ( 13 ) comprises:

a first solenoid valve ( 131 ), wherein a first valve port of the first solenoid valve ( 131 ) and a second valve port of the first solenoid valve ( 131 ) are both connected to the external cooling system ( 2 );

a second solenoid valve ( 132 ), wherein a first valve port of the second solenoid valve ( 132 ) is connected to the first valve port of the first solenoid valve ( 131 ), and a second valve port of the second solenoid valve ( 132 ) is connected to a thermal management module for the battery pack;

a third solenoid valve ( 133 ), wherein a first valve port of the third solenoid valve ( 133 ) is connected to the second valve port of the first solenoid valve ( 131 ), and a second valve port of the third solenoid valve ( 133 ) is connected to the thermal management module for the battery pack;

a fourth solenoid valve ( 134 ), wherein a first valve port of the fourth solenoid valve ( 134 ) is connected to the external cooling system ( 2 ), and a second valve port of the fourth solenoid valve ( 134 ) is connected to a first valve port of a fifth solenoid valve ( 135 ) and the thermal management module for the battery pack; and

the fifth solenoid valve ( 135 ), wherein a second valve port of the fifth solenoid valve ( 135 ) is connected to the second valve port of the second solenoid valve ( 132 ), wherein

the external port comprises the first valve port of the first solenoid valve ( 131 ), the second valve port of the first solenoid valve ( 131 ), and the first valve port of the fourth solenoid valve ( 134 );

the external cooling system ( 2 ) is an electric motor and control cooling system ( 3 ), and the electric motor and control cooling system ( 3 ) comprises a cooler ( 31 ), a second water pump ( 32 ), an electric control device ( 33 ), and an electric motor ( 34 );

the first valve port of the first solenoid valve ( 131 ) is connected to a first end of the electric motor ( 34 ), and a second end of the electric motor ( 34 ) is connected to a first end of the electric control device ( 33 );

the second valve port of the first solenoid valve ( 131 ) is connected to an inlet of the cooler ( 31 ), and an outlet of the cooler ( 31 ) is connected to a first end of the second water pump ( 32 ); and

the first valve port of the fourth solenoid valve ( 134 ) is connected to a second end of the second water pump ( 32 ) and a second end of the electric control device ( 33 ); and

under a condition that the electric motor ( 34 ) and the electric control device ( 33 ) need to be cooled and the battery pack needs to be heated, the processor ( 12 ) is configured to control the first solenoid valve ( 131 ), the fourth solenoid valve ( 134 ), and the fifth solenoid valve ( 135 ) to be in a closed state, control the second solenoid valve ( 132 ) and the third solenoid valve ( 133 ) to be in an open state, and control the second water pump ( 32 ) to be in a started state.

2. The system according to claim 1 , wherein under a condition that the electric vehicle is in a driving state, the electric motor ( 34 ) and the electric control device ( 33 ) need to be cooled and the battery pack also needs to be cooled, the processor ( 12 ) is configured to control the second solenoid valve ( 132 ), the third solenoid valve ( 133 ), and the fourth solenoid valve ( 134 ) to be in a closed state, control the first solenoid valve ( 131 ) and the fifth solenoid valve ( 135 ) to be in an open state, and control the first water pump ( 113 ) and the second water pump ( 32 ) to be in a started state.

3. The system according to claim 1 , wherein under a condition that the electric vehicle is in a driving state, the electric motor ( 34 ) and the electric control device ( 33 ) need to be cooled and the battery pack does not need thermal management, the processor ( 12 ) is configured to control the second solenoid valve ( 132 ), the third solenoid valve ( 133 ), and the fourth solenoid valve ( 134 ) to be in a closed state, control the first solenoid valve ( 131 ) to be in an open state, and control the second water pump ( 32 ) to be in a started state.

4. The system according to claim 1 , wherein under a condition that the electric vehicle is in a parking state, the electric motor ( 34 ) and the electric control device ( 33 ) do not need thermal management and the battery pack needs to be cooled, the processor ( 12 ) is configured to control the second solenoid valve ( 132 ), the third solenoid valve ( 133 ), and the fourth solenoid valve ( 134 ) to be in a closed state, control the fifth solenoid valve ( 135 ) to be in an open state, and control the first water pump ( 113 ) to be in a started state.

5. The system according to claim 1 ,

wherein the first cooling system ( 114 ) is an air conditioner system ( 4 ), and is further configured to cool a passenger compartment of the electric vehicle, wherein the air conditioner system ( 4 ) comprises:

a first evaporator ( 41 ), wherein a first end of the first evaporator ( 41 ) is connected to a first end of a compressor ( 42 ) and a first end of a second evaporator ( 46 ), and the first evaporator ( 41 ) is connected to the second heat exchanger ( 112 ) and is configured to absorb heat transferred by the second heat exchanger ( 112 ), so as to cool the battery pack;

the compressor ( 42 ), wherein a second end of the compressor ( 42 ) is connected to a first end of a condenser ( 43 );

the condenser ( 43 ), wherein a second end of the condenser ( 43 ) is connected to a first valve port of a first expansion valve ( 44 ) and a first valve port of a second expansion valve ( 45 );

the first expansion valve ( 44 ), wherein a second valve port of the first expansion valve ( 44 ) is connected to a second end of the first evaporator ( 41 );

the second expansion valve ( 45 ), wherein a second valve port of the second expansion valve ( 45 ) is connected to a second end of the second evaporator ( 46 );

the second evaporator ( 46 ), configured to cool the passenger compartment of the electric vehicle; and

a fan ( 47 ), configured to transfer cold air generated by the second evaporator ( 46 ) into the passenger compartment.

6. The system according to claim 5 , wherein the air conditioner system ( 4 ) further comprises a heater ( 48 ), configured to heat the passenger compartment; and

the fan ( 47 ) is further configured to transfer heat generated by the heater ( 48 ) into the passenger compartment.

7. The system according to claim 5 ,

wherein a power of the second water pump ( 32 ) is P1 and a flow speed of a coolant is V1 in a case that the first solenoid valve ( 131 ), the fourth solenoid valve ( 134 ), and the fifth solenoid valve ( 135 ) are all in a closed state, and the second solenoid valve ( 132 ) and the third solenoid valve ( 133 ) are both in an open state;

the power of the second water pump ( 32 ) is P2 and the flow speed of the coolant is V1 in a case that the second solenoid valve ( 132 ), the third solenoid valve ( 133 ), and the fourth solenoid valve ( 134 ) are all in a closed state, and the first solenoid valve ( 131 ) and the fifth solenoid valve ( 135 ) are both in an open state; and

P1 is greater than P2.

8. The system according to claim 7 , wherein the system further comprises:

a first temperature sensor, connected to the processor ( 12 ), and configured to collect a temperature of the electric motor ( 34 ); and

the processor ( 12 ) is configured to adjust a rotation speed of the fan ( 47 ) in the cooler ( 31 ) according to the temperature of the electric motor ( 34 ).

9. The system according to claim 7 , wherein the system further comprises:

a second temperature sensor, connected to a processor ( 12 ), and configured to collect a temperature of a first port of the first heat exchanger ( 111 );

a third temperature sensor, connected to the processor ( 12 ), and configured to collect a temperature of a second port of the first heat exchanger ( 111 ); and

a fourth temperature sensor, connected to the processor ( 12 ), and configured to collect a temperature of the battery pack, wherein

the processor ( 12 ) is configured to adjust the power of the second water pump ( 32 ) according to the temperature of the first port of the first heat exchanger ( 111 ), the temperature of the second port of the first heat exchanger ( 111 ), and the temperature of the battery pack.