CN-122008813-A - Battery heating method, device, equipment, medium and vehicle of vehicle heat pump system

Abstract

The application relates to the technical field of vehicles, and provides a battery heating method, device, equipment, medium and a vehicle of a vehicle heat pump system. The battery heating method comprises the steps of responding to a battery heating request, obtaining operation parameters of a compressor of a refrigerant loop and temperature parameters of a battery of the battery loop, judging whether a first heating mode is entered according to the operation parameters and the temperature parameters, if yes, enabling the refrigerant loop to be in a conducting state, closing a connecting channel to enable the battery loop and a warm air loop to be conducted independently, enabling the warm air loop to heat the compressor, judging whether a second heating mode is entered according to the operation parameters, and if yes, opening at least part of opening of the connecting channel to enable the warm air loop to heat the battery loop through the connecting channel.

Inventors

• JIN XINLIANG
• HE LINJIAN
• LIU TIEJIANG
• FENG MENGLONG
• CHEN PAN
• DAI SHAOGANG

Assignees

• 贵州吉利汽车制造有限公司
• 浙江吉利控股集团有限公司
• 吉利汽车研究院（宁波）有限公司

Dates

Publication Date

20260512

Application Date

20260331

Claims (15)

1. 1. A battery heating method of a vehicle heat pump system is characterized in that the heat pump system comprises a refrigerant loop, a warm air loop and a battery loop, a connecting channel with adjustable opening is arranged between the warm air loop and the battery loop, The battery heating method comprises the following steps: acquiring an operating parameter of a compressor of the refrigerant circuit and a temperature parameter of a battery of the battery circuit in response to a battery heating request; Judging whether to enter a first heating mode according to the operation parameters and the temperature parameters, if so, enabling the refrigerant loop to be in a conducting state, closing the connecting channel to enable the battery loop and the warm air loop to be respectively and independently conducted, enabling the warm air loop to heat the compressor, and And judging whether to enter a second heating mode according to the operation parameters, if so, opening at least part of the opening of the connecting channel to enable the warm air loop to heat the battery loop through the connecting channel.
2. 2. The battery heating method according to claim 1, wherein the determining whether to enter the first heating mode according to the operation parameter and the temperature parameter further comprises: When the operation parameter is smaller than a preset operation parameter value and the temperature parameter is smaller than a preset temperature parameter value, judging to enter a first heating mode and outputting a first heating instruction; In response to the first heating command, placing the refrigerant circuit in an on state; And responding to the first heating instruction, cutting off the connecting channel, and respectively conducting the battery loop and the warm air loop.
3. 3. The method for heating a battery according to claim 2, wherein, The refrigerant circuit includes a first refrigerant circuit and a second refrigerant circuit, The first refrigerant loop comprises a compressor, a first heat exchanger and a first throttle valve; The second refrigerant circuit includes a compressor common to the first refrigerant circuit, a first heat exchanger common to the first refrigerant circuit, a second throttle valve, and a second heat exchanger; the method further includes closing the second throttle valve to place the second refrigerant circuit in a closed state in response to the first heating command, and opening a first throttle valve to conduct the first refrigerant circuit to circulate refrigerant output from a discharge port of the compressor to an intake port of the compressor through the first refrigerant circuit.
4. 4. The method for heating a battery according to claim 3, wherein, The refrigerant circuit further comprises a third refrigerant circuit, wherein the third refrigerant circuit comprises a third throttle valve, and two ends of the third throttle valve are respectively and correspondingly connected with an air inlet and an air outlet of the compressor; After entering the first heating mode, the method further includes opening a third throttle valve to conduct a third refrigerant circuit in response to the first heating command, and circulating a portion of refrigerant output from a discharge port of the compressor to an intake port of the compressor through the third refrigerant circuit.
5. 5. The battery heating method according to claim 1, wherein the determining whether to enter the second heating mode according to the operation parameter further comprises: judging to enter a second heating mode and outputting a second heating instruction when the operation parameter is greater than or equal to a preset operation parameter value, and judging to be maintained in the first heating mode when the operation parameter is less than the preset operation parameter value; and responding to the second heating instruction, heating the compressor by the warm air loop, and opening at least part of the opening of the connecting channel to enable the warm air loop to heat the battery loop through the connecting channel.
6. 6. The battery heating method according to claim 5, wherein said opening at least part of the opening of the connection passage further comprises: In the heating process, acquiring the temperature parameter and the actual outlet pressure of an exhaust port of the compressor in real time; Determining a corresponding target outlet pressure according to the temperature parameter; adjusting the opening degree of the connection passage according to the actual outlet pressure and the target outlet pressure, When the actual outlet pressure is smaller than the minimum value of the target outlet pressure, the opening degree of the connecting passage is reduced, When the actual outlet pressure is equal to or greater than the minimum value of the target outlet pressure and equal to or less than the maximum value of the target outlet pressure, maintaining the opening degree of the connecting channel unchanged, When the actual outlet pressure is greater than the maximum value of the target outlet pressure, the opening degree of the connection passage is increased.
7. 7. A battery heating method according to claim 3, characterized in that the method further comprises: and acquiring the temperature of an inlet medium of the battery loop, judging whether to enter a third heating mode according to the temperature of the inlet medium, if so, opening all the openings of the connecting channels, wherein part of the battery loop and part of the warm air loop form a warm air pump battery heating loop, and the warm air pump battery heating loop heats the battery until the temperature parameter meets a preset temperature parameter value.
8. 8. The method for heating a battery according to claim 7, wherein, The battery loop comprises a battery pump, a battery, a first three-way conduction joint, a one-way valve and a second three-way conduction joint; the warm air loop comprises a warm air pump, a first heat exchanger shared with the first refrigerant loop, a three-way valve, a warm air core body and a third three-way conduction joint; the connecting channel comprises a first channel and a second channel, and the opening of the second channel is changed along with the opening of the first channel; The first channel is connected with the first end of the three-way valve and the second three-way conduction joint; the second channel is connected with the first three-way conduction joint and the third three-way conduction joint; the third end of the three-way valve is connected with the inlet end of the warm air core body; the outlet end of the warm air core body is connected with the third three-way conduction joint; Opening all the opening degrees of the connecting channels further comprises opening all the opening degrees of the first end of the three-way valve, closing all the opening degrees of the third end of the three-way valve, and forming a warm air pump battery heating loop by the battery pump, the battery, the first three-way conduction joint, the second channel, the warm air pump, the first heat exchanger, the first end of the three-way valve and the first channel.
9. 9.A battery heating method according to claim 3, characterized in that the method further comprises: in the heating process, acquiring the suction superheat degree of the compressor; The opening degree of the first throttle valve is adjusted according to the suction superheat degree, When the suction superheat degree is smaller than a preset superheat degree minimum value, controlling the opening degree of the first throttle valve to be reduced, When the suction superheat degree is greater than or equal to the preset superheat degree minimum value and less than or equal to the preset superheat degree maximum value, the opening degree of the first throttle valve is maintained unchanged, And when the suction superheat degree is larger than the maximum value of the preset superheat degree, controlling the opening degree of the first throttle valve to be increased.
10. 10. The battery heating method according to claim 4, characterized in that the method further comprises: In the heating process, acquiring the suction pressure of the compressor; The opening degree of the third throttle valve is adjusted according to the suction pressure, When the suction pressure is smaller than a preset suction pressure minimum value, controlling the opening degree of the third throttle valve to be increased, When the suction pressure is larger than or equal to the preset suction pressure minimum value and smaller than or equal to the preset suction pressure maximum value, the opening degree of the third throttle valve is maintained unchanged, And when the suction pressure is larger than a preset suction pressure maximum value, controlling the opening degree of the third throttle valve to be reduced.
11. 11. The method for heating a battery according to claim 3, wherein, The first throttle valve is connected with an air inlet of the compressor through the third heat exchanger; The heat pump system further comprises an electric drive circuit sharing the same third heat exchanger as the first refrigerant circuit; the method further comprises the steps of: in the first heating mode, obtaining a third heat exchanger medium temperature at an inlet end of the third heat exchanger; Outputting an electric drive heating instruction when the medium temperature of the third heat exchanger is smaller than a preset medium temperature threshold value; And responding to an electric drive heating instruction, and conducting the electric drive loop.
12. 12. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the battery heating method according to any of the preceding claims 1-11 when the computer program is executed.
13. 13. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, carries out the steps of the battery heating method according to any one of the preceding claims 1-11.
14. 14. The control device of the vehicle heat pump system is characterized in that the heat pump system comprises a first refrigerant loop, a warm air loop and a battery loop, wherein a connecting channel with adjustable opening is arranged between the warm air loop and the battery loop; the control device includes: an acquisition module for acquiring an operation parameter of a compressor of the refrigerant circuit and a temperature parameter of a battery of the battery circuit in response to a battery heating request; The first heating mode control module is used for judging whether to enter a first heating mode according to the operation parameters and the temperature parameters, if so, the refrigerant loop is in a conducting state, the connecting channel is closed to enable the battery loop and the warm air loop to be respectively and independently conducted, the warm air loop heats the compressor, and And the second heating mode control module is used for judging whether to enter a second heating mode according to the operation parameters, if so, opening at least part of the opening of the connecting channel so that the warm air loop heats the battery loop through the connecting channel.
15. 15. A vehicle comprising a heat pump system and the control device of the vehicle heat pump system according to claim 14, wherein the heat pump system comprises a refrigerant circuit, a warm air circuit and a battery circuit, a connection passage with an adjustable opening is arranged between the warm air circuit and the battery circuit, and the control device is used for controlling the heat pump system.

Description

Battery heating method, device, equipment, medium and vehicle of vehicle heat pump system Technical Field The present application relates to the field of vehicle technologies, and in particular, to a method, an apparatus, a device, a medium, and a vehicle for heating a battery of a vehicle heat pump system. Background Along with the great promotion of new energy popularity, for promoting winter low temperature duration, the proportion that new energy automobile equipped with heat pump system promotes year by year. In order to ensure the heating requirement at low temperature, two low-temperature battery heating schemes are mainly adopted at present, one heating scheme is that a heat pump system is combined with a compressor for active heating, and the heating scheme has the problems of weak system heating capacity and low battery heating rate of a pure heat pump system at low temperature. Another heating scheme is a scheme of heat pump system, electric drive active heating and PTC (air heater) co-heating. PTC systems are relatively simple, but have low energy utilization and high power consumption. Therefore, the related art still has the problems of long time, large power consumption and low efficiency when the battery is heated in a low-temperature environment. Disclosure of Invention In order to solve the technical problems, the application provides a battery heating method, a device, equipment, a medium and a vehicle of a vehicle heat pump system, and the battery heating method can solve the problems of long time, high power consumption and low efficiency when heating a battery in a low-temperature environment. In a first aspect, the present application provides a method for heating a battery of a vehicle heat pump system, the heat pump system comprising a refrigerant circuit, a warm air circuit and a battery circuit, a connection channel with an adjustable opening degree being provided between the warm air circuit and the battery circuit, The battery heating method comprises the following steps: acquiring an operating parameter of a compressor of the refrigerant circuit and a temperature parameter of a battery of the battery circuit in response to a battery heating request; Judging whether to enter a first heating mode according to the operation parameters and the temperature parameters, if so, enabling the refrigerant loop to be in a conducting state, closing the connecting channel to enable the battery loop and the warm air loop to be respectively and independently conducted, and enabling the warm air loop to heat the compressor; and judging whether to enter a second heating mode according to the operation parameters, if so, opening at least part of the opening of the connecting channel to enable the warm air loop to heat the battery loop through the connecting channel. According to the battery heating method, in the first heating mode, the battery loop and the warm air loop are independently conducted, so that two independent short circulation loops are formed by the battery loop and the warm air loop, and the compressor in a low-temperature state can be quickly heated by means of the heat of the short warm air loop through the double short circulation paths of the first heating mode, so that the compressor is in a high-efficiency state; the double short circulation paths can also lead the battery to be preheated in advance through self circulation, so that the heating time is further shortened. After the rotating speed of the compressor reaches a stable state, the compressor is switched to a second heating mode, and the auxiliary heating is not needed to be performed by the air heater in the process, so that the extra electric quantity consumption is reduced, and the high efficiency and the low energy consumption of low-temperature battery heating are realized. In an alternative embodiment, the determining whether to enter the first heating mode according to the operation parameter and the temperature parameter further includes: When the operation parameter is smaller than a preset operation parameter value and the temperature parameter is smaller than a preset temperature parameter value, judging to enter a first heating mode and outputting a first heating instruction; In response to the first heating command, placing the refrigerant circuit in an on state; and responding to the first heating instruction, cutting off the connecting channel, and conducting the battery loop and the warm air loop. In an alternative embodiment, the refrigerant circuit includes a first refrigerant circuit and a second refrigerant circuit, The first refrigerant loop comprises a compressor, a first heat exchanger and a first throttle valve, wherein the first refrigerant loop and the warm air loop are coupled at the first heat exchanger; The second refrigerant circuit includes a compressor common to the first refrigerant circuit, a first heat exchanger common to the first refrigerant circuit, a second throttle valve, and