CN-122000524-A - Thermal management system, control method and electric equipment

Abstract

The application relates to the technical field of batteries and provides a heat management system, a control method and electric equipment, wherein the heat management system comprises a circulating unit and a branch unit, the circulating unit comprises a refrigerant circulating flow path, a compressor, a heat exchange device, a first throttling device, a heat exchanger and a reversing device, and the compressor, the heat exchange device, the first throttling device and the heat exchanger are sequentially connected in series in the refrigerant circulating flow path; the reversing device is arranged in the refrigerant circulation flow path to change the flow direction of the refrigerant in the refrigerant circulation flow path, and the refrigerant circulation flow path is provided with a first node and a second node. The branch unit comprises a refrigerant branch, a heating device and a second throttling device, wherein the refrigerant branch is communicated with the first node and the second node, and the heating device and the second throttling device are both arranged on the refrigerant branch. At least one of the heat exchanger and the heating device can be selected to heat the refrigerant according to the ambient temperature, so that the heating requirement of the battery monomer under a large range of ambient temperature can be met through the double-source heating of the air source and the heating device.

Inventors

• LI JINKUI
• LI QING
• YU DONGXU
• LI ZHONGHONG
• ZHANG KAIWEN
• Ye Weida
• YANG LE
• LIU HONGBIAO

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260508

Application Date

20241104

Claims (20)

1. 1. A thermal management system, comprising: The circulating unit comprises a refrigerant circulating flow path, a compressor, a heat exchange device, a first throttling device, a heat exchanger and a reversing device, wherein the compressor, the heat exchange device, the first throttling device and the heat exchanger are sequentially connected in series and arranged in the refrigerant circulating flow path; the reversing device is arranged in the refrigerant circulation flow path to change the flow direction of the refrigerant in the refrigerant circulation flow path, the heat exchanger is used for carrying out heat exchange with an air source, the heat exchange device is used for carrying out heat exchange with a battery monomer, the refrigerant circulation flow path is provided with a first node and a second node, the first node is positioned between the heat exchange device and the first throttling device, and the second node is positioned between the heat exchanger and the reversing device; The branch unit comprises a refrigerant branch, a heating device and a second throttling device, wherein the refrigerant branch is communicated with the first node and the second node, the heating device and the second throttling device are both arranged on the refrigerant branch, and the second throttling device is positioned between the heating device and the first node.
2. 2. The thermal management system of claim 1, comprising a super-cooler having a first channel and a second channel, the first channel being in series between the reversing device and the heat exchange device, the second channel being in series between the second node and the heating device.
3. 3. The thermal management system of claim 2, comprising a first detection device disposed in a refrigerant path between the first channel and the heat exchange device to detect a first temperature and a first pressure of a refrigerant.
4. 4. The thermal management system of claim 1, comprising a second detection device disposed in a refrigerant path between the heat exchange device and the first throttling device to detect a second temperature and a second pressure of the refrigerant.
5. 5. The thermal management system of claim 1, comprising a third detection device, the compressor having a suction port, the third detection device being disposed in a refrigerant path between the suction port and the reversing device to detect a third temperature and a third pressure of the refrigerant.
6. 6. The thermal management system of claim 1, wherein the thermal management system comprises a first heating mode in which the first throttling device is in a closed state, the second throttling device is in an open state, and both the compressor and the heating device are in an operational state.
7. 7. The thermal management system of claim 6, wherein the thermal management system operates the first heating mode if the ambient temperature is not greater than a set temperature.
8. 8. The thermal management system of claim 1, wherein the thermal management system comprises a second heating mode in which the first throttling device is in an open state, the second throttling device is in a closed state, the heating device is in a shutdown state, the compressor is in an operational state, and the heat exchanger is an evaporator.
9. 9. The thermal management system of claim 8, wherein the thermal management system operates the second heating mode in the event that the ambient temperature is greater than a set temperature.
10. 10. The thermal management system of claim 1, wherein the thermal management system comprises a third heating mode in which both the first and second throttling means are in an open state, both the heating means and the compressor are in an operational state, and the heat exchanger is an evaporator.
11. 11. The thermal management system of claim 1, wherein the thermal management system comprises a cooling mode in which the first throttling means is in an open state, the second throttling means is in a closed state, the heating means is in a shutdown state, the compressor is in an operational state, and the heat exchanger is a condenser.
12. 12. The thermal management system of claim 1, comprising a defrost unit comprising a defrost branch and a switch valve, the switch valve disposed in the defrost branch, the refrigerant circulation flow path having a third node and a fourth node, the third node being located between the reversing device and the heat exchange device, the fourth node being located between the first throttling device and the heat exchanger, the defrost branch communicating the third node and the fourth node.
13. 13. The thermal management system of claim 12, wherein the thermal management system comprises a defrost mode in which the first throttling means is in a closed state, the second throttling means and the on-off valve are both in an open state, and the heating means and the compressor are both in an operational state.
14. 14. The thermal management system of any one of claims 1 to 13, wherein said heat exchange means comprises a confluence flow divider, at least two flow dividing lines, and at least two heat exchange members, each for heat exchange with at least one of said battery cells, each communicating with one of said flow dividing lines, all of said heat exchange members communicating with said refrigerant circulation flow path, all of said flow dividing lines communicating with said confluence flow divider, and all of said flow dividing lines communicating with said refrigerant circulation flow path through said confluence flow divider.
15. 15. A control method for the thermal management system of claim 1, the control method comprising: Acquiring an ambient temperature; and under the condition that the ambient temperature is not greater than the set temperature, closing the first throttling device, opening the second throttling device, and operating the compressor and the heating device.
16. 16. The control method according to claim 15, characterized in that the control method includes: And under the condition that the ambient temperature is higher than the set temperature, opening the first throttling device, closing the second throttling device, stopping the heating device, and operating the compressor.
17. 17. The control method of claim 15, wherein the thermal management system includes a super cooler having a first passage and a second passage, the first passage being in series between the reversing device and the heat exchange device, the second passage being in series between the second node and the heating device, the control method comprising: acquiring a first temperature and a first pressure of a refrigerant in a refrigerant path between the first channel and the heat exchange device; acquiring a superheat degree based on the first temperature and the first pressure; and when the superheat degree is larger than a first threshold value, increasing the opening degree of the second throttling device and/or reducing the rotating speed of the compressor.
18. 18. The control method according to claim 17, characterized in that the control method includes: and when the superheat degree is smaller than a second threshold value, reducing the opening degree of the second throttling device and/or increasing the rotating speed of the compressor, wherein the second threshold value is smaller than the first threshold value.
19. 19. The control method according to claim 15, characterized in that the control method includes: acquiring a second temperature and a second pressure of a refrigerant in a refrigerant path between the heat exchange device and the first throttling device; acquiring a supercooling degree based on the second temperature and the second pressure; and in the case that the supercooling degree is greater than a third threshold value, increasing the opening degree of the first throttling device and/or increasing the rotation speed of the compressor.
20. 20. The control method according to claim 19, characterized in that the control method includes: And in the case that the supercooling degree is smaller than a fourth threshold value, reducing the opening degree of the first throttling device and/or reducing the rotating speed of the compressor, wherein the fourth threshold value is smaller than the third threshold value.

Description

Thermal management system, control method and electric equipment Technical Field The application relates to the technical field of batteries, in particular to a thermal management system, a control method and electric equipment. Background The battery cells may be used to store or provide electrical energy, the battery cells may be used with electrical equipment, for example, the battery cells may be used with vehicles and energy storage devices, and the like. In the related art, the thermal management system exchanges heat with the battery cell through a refrigerant to adjust the temperature of the battery cell. Aiming at the condition that the temperature of the battery monomer needs to be raised, the refrigerant absorbs the heat of the air source and releases the heat to the battery monomer, so that the temperature of the battery monomer is increased, however, under the condition that the ambient temperature is low, the problem that the heating effect of the refrigerant on the battery monomer is poor exists. Disclosure of Invention In view of this, the embodiments of the present application are expected to provide a thermal management system, a control method, and an electric device, which can meet the heating requirement of the battery cell under a wide range of ambient temperature by dual-source heating of the air source and the heating device. In order to achieve the above object, the technical solution of the embodiment of the present application is as follows: an embodiment of the present application provides a thermal management system, including: The circulating unit comprises a refrigerant circulating flow path, a compressor, a heat exchange device, a first throttling device, a heat exchanger and a reversing device, wherein the compressor, the heat exchange device, the first throttling device and the heat exchanger are sequentially connected in series and arranged in the refrigerant circulating flow path; the reversing device is arranged in the refrigerant circulation flow path to change the flow direction of the refrigerant in the refrigerant circulation flow path, the heat exchanger is used for carrying out heat exchange with an air source, the heat exchange device is used for carrying out heat exchange with a battery monomer, the refrigerant circulation flow path is provided with a first node and a second node, the first node is positioned between the heat exchange device and the first throttling device, and the second node is positioned between the heat exchanger and the reversing device; The branch unit comprises a refrigerant branch, a heating device and a second throttling device, wherein the refrigerant branch is communicated with the first node and the second node, the heating device and the second throttling device are both arranged on the refrigerant branch, and the second throttling device is positioned between the heating device and the first node. The heat management system provided by the embodiment of the application uses the refrigerant as an intermediate medium to regulate the temperature of the battery monomer. Under the condition that the battery monomer needs to be heated, an air source can be selected as a heat source, heat exchange between the refrigerant and the air source is realized through a heat exchanger, heat of the air source is transferred to the battery monomer by taking the refrigerant as an intermediate medium, a heating device can also be selected as the heat source, heat exchange between the refrigerant and other energy sources is realized through the heating device, and heat of other energy sources is transferred to the battery monomer by taking the refrigerant as the intermediate medium. According to the heating requirement of the battery monomer, the heat exchanger can realize heat exchange between the air source and the refrigerant, the heating device can heat the refrigerant, and at least one of the heat exchanger and the heating device can be selected to heat the refrigerant according to the ambient temperature, so that the battery monomer can be heated by the air source and the heating device in a double source manner, and the heating requirement of the battery monomer under a large range of ambient temperature can be met. In some embodiments, the thermal management system includes a super cooler having a first passage and a second passage, the first passage being in series between the reversing device and the heat exchange device, the second passage being in series between the second node and the heating device. In this embodiment, the pressure and the temperature of the refrigerant in the first channel and the refrigerant in the second channel are different, and the refrigerant in the first channel and the refrigerant in the second channel can exchange heat, so that the temperature of the refrigerant in the first channel and the temperature of the refrigerant in the second channel can be adjusted. In some embodiments, the thermal management system inc