Thermal management system, battery assembly and electric device

Abstract

A thermal management system, a battery assembly, and an electric device. The thermal management system comprises a heat exchange unit, which comprises at least two heat exchange circuits, wherein adjacent heat exchange circuits are arranged in parallel, and each heat exchange circuit is provided with a heat exchanger, at least one heat exchange circuit having a plurality of heat exchangers arranged in series; and a regulating unit, which is configured to adjust the heat exchange capacity of each heat exchange circuit by regulating the pressure and / or flow rate of a refrigerant in said heat exchange circuit.

Description

Thermal management system, battery assembly and electric device

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to the Chinese patent application No. 202410798896.6, filed on June 19, 2024, and entitled “Thermal management system, battery assembly and electric device”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of battery pack thermal management, in particular, to a thermal management system, a battery assembly and an electric device. BACKGROUND

[0004] For electric devices such as new energy vehicles, due to the priority of the layout space of the whole vehicle, when multiple battery packs or special-shaped battery packs are involved, there is a huge gap in the heat exchange demand between the cold plates used for heat exchange of the battery packs. The size difference of the battery packs leads to a large difference in the pressure loss of each cold plate, thereby affecting the uniformity of the battery pack temperature. SUMMARY

[0005] The purpose of the present disclosure is to provide a thermal management system, a battery assembly and an electric device, which makes the deviation value between the heat exchange amounts of each heat exchange pipeline within a preset range, to at least partially solve the above technical problems.

[0006] In order to achieve the above purpose, the first aspect of the present disclosure provides a thermal management system, comprising: a heat exchange unit, comprising at least two heat exchange pipelines, adjacent heat exchange pipelines are arranged in parallel, a heat exchanger is arranged on each heat exchange pipeline, and the number of heat exchangers in at least one heat exchange pipeline is multiple and arranged in series; and an adjusting unit, the adjusting unit is configured to be able to adjust the heat exchange amount of each heat exchange pipeline by adjusting the refrigerant pressure and / or flow in the heat exchange pipeline.

[0007] Optionally, the deviation value between the heat exchange amounts of each heat exchange pipeline is not greater than 30%.

[0008] Optionally, the heat exchange amounts of the heat exchangers in at least two heat exchange pipelines are different.

[0009] Optionally, the heat exchange unit comprises a first heat exchange pipeline, a second heat exchange pipeline and a third heat exchange pipeline arranged in parallel, the heat exchanger comprises a first heat exchanger, a second heat exchanger and a third heat exchanger, the first heat exchanger is arranged in the first heat exchange pipeline and used for heat exchange of the first battery pack, the second heat exchanger is arranged in the second heat exchange pipeline and used for heat exchange of the second battery pack, the third heat exchanger is arranged in the third heat exchange pipeline and used for heat exchange of the third battery pack, wherein the heat exchange amounts of the first heat exchanger, the second heat exchanger and the third heat exchanger are different.

[0010] Optionally, the number of the first heat exchanger is multiple and arranged in series in the first heat exchange pipeline; the number of the second heat exchanger is multiple and arranged in series in the second heat exchange pipeline; wherein the heat exchange amount of the first heat exchanger is less than the heat exchange amount of the second heat exchanger.

[0011] Optionally, the adjusting unit comprises a first adjusting assembly arranged in the first heat exchange pipeline, a second adjusting assembly arranged in the second heat exchange pipeline and a third adjusting assembly arranged in the third heat exchange pipeline, the first adjusting assembly, the second adjusting assembly and the third adjusting assembly respectively adjust the refrigerant pressure and flow in the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline.

[0012] Optionally, the first adjusting assembly comprises a first electronic expansion valve, a second electronic expansion valve, a first temperature sensor and a first pressure temperature sensor, the first electronic expansion valve and the first temperature sensor are both located at the refrigerant inlet of the first heat exchange pipeline, the second electronic expansion valve and the first pressure temperature sensor are both located at the refrigerant outlet of the first heat exchange pipeline; the second adjusting assembly comprises a third electronic expansion valve, a fourth electronic expansion valve, a second temperature sensor and a second pressure temperature sensor, the third electronic expansion valve and the second temperature sensor are both located at the refrigerant inlet of the second heat exchange pipeline, the fourth electronic expansion valve and the second pressure temperature sensor are both located at the refrigerant outlet of the second heat exchange pipeline; the third adjusting assembly comprises a fifth electronic expansion valve, a sixth electronic expansion valve, a third temperature sensor and a third pressure temperature sensor, the fifth electronic expansion valve and the third temperature sensor are both located at the refrigerant inlet of the third heat exchange pipeline, the sixth electronic expansion valve and the third pressure temperature sensor are both located at the refrigerant outlet of the third heat exchange pipeline.

[0013] Optionally, the deviation value between the heat exchange amounts of the heat exchange pipelines is equal to the ratio of the difference between the maximum value of the heat exchange amounts of the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline and the minimum value of the heat exchange amounts of the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline to the maximum value of the heat exchange amounts of the first heat exchange pipeline, the second heat exchange pipeline and the third heat exchange pipeline.

[0014] Optionally, the thermal management system further comprises a fourth heat exchanger, a gas-liquid separator, a liquid accumulator and a compressor, a seventh electronic expansion valve is arranged at a refrigerant outlet of the fourth heat exchanger and is in communication with refrigerant inlets of the heat exchange pipelines, a refrigerant inlet of the fourth heat exchanger is selectively in communication with a refrigerant outlet of the compressor or a refrigerant inlet of the compressor; a refrigerant inlet of the compressor or a refrigerant outlet of the compressor is selectively in communication with refrigerant outlets of the heat exchange pipelines; the gas-liquid separator is arranged between the refrigerant inlet of the compressor and the refrigerant outlets of the heat exchange pipelines, a refrigerant inlet of the gas-liquid separator is selectively in communication with the refrigerant outlets of the heat exchange pipelines or the refrigerant outlet of the compressor, and a refrigerant outlet of the gas-liquid separator is in communication with the refrigerant inlet of the compressor; the liquid accumulator is arranged between the fourth heat exchanger and the refrigerant inlets of the heat exchange pipelines, a refrigerant inlet of the liquid accumulator is selectively in communication with the refrigerant outlet of the fourth heat exchanger, and a refrigerant outlet of the liquid accumulator is in communication with the refrigerant inlets of the heat exchange pipelines.

[0015] Optionally, the thermal management system further comprises a fifth heat exchanger, an eighth electronic expansion valve is arranged at a refrigerant inlet of the fifth heat exchanger and is selectively in communication with the liquid accumulator, and a refrigerant outlet of the fifth heat exchanger is in communication with the gas-liquid separator.

[0016] Optionally, the thermal management system further comprises a first switching assembly in communication with the refrigerant outlets of the heat exchange pipelines, the first switching assembly is configured to selectively connect the heat exchange pipelines with the refrigerant outlet of the compressor or the refrigerant inlet of the gas-liquid separator.

[0017] Optionally, the thermal management system further comprises a second switching assembly in communication with the refrigerant inlet of the fourth heat exchanger, the second switching assembly is configured to selectively connect the refrigerant inlet of the fourth heat exchanger with the refrigerant inlet of the gas-liquid separator or the refrigerant outlet of the compressor.

[0018] Optionally, the first switching assembly comprises two first control valves arranged in parallel, one of the first control valves is used to control the communication between the refrigerant outlet of the compressor and the refrigerant outlets of the heat exchange pipelines, and the other first control valve is used to control the communication between the gas-liquid separator and the refrigerant outlets of the heat exchange pipelines.

[0019] Optionally, the first switching assembly comprises a ninth electronic expansion valve, a tenth electronic expansion valve, and an eleventh electronic expansion valve, wherein the ninth electronic expansion valve is arranged at a refrigerant outlet of the first heat exchange pipeline and is arranged in parallel with the second electronic expansion valve, the second electronic expansion valve is configured to control the refrigerant communication between the first heat exchange pipeline and the refrigerant inlet of the gas-liquid separator, and the ninth electronic expansion valve is configured to control the refrigerant communication between the first heat exchange pipeline and the refrigerant outlet of the compressor; the tenth electronic expansion valve is arranged at a refrigerant outlet of the second heat exchange pipeline and is arranged in parallel with the fourth electronic expansion valve, the fourth electronic expansion valve is configured to control the refrigerant communication between the second heat exchange pipeline and the refrigerant inlet of the gas-liquid separator, and the tenth electronic expansion valve is configured to control the refrigerant communication between the second heat exchange pipeline and the refrigerant outlet of the compressor; and the eleventh electronic expansion valve is arranged at a refrigerant outlet of the third heat exchange pipeline and is arranged in parallel with the sixth electronic expansion valve, the sixth electronic expansion valve is configured to control the refrigerant communication between the third heat exchange pipeline and the refrigerant inlet of the gas-liquid separator, and the eleventh electronic expansion valve is configured to control the refrigerant communication between the third heat exchange pipeline and the refrigerant outlet of the compressor.

[0020] Optionally, the second switching assembly comprises two second control valves arranged in parallel, wherein one of the second control valves is configured to control the refrigerant communication between the refrigerant outlet of the compressor and the refrigerant inlet of the fourth heat exchanger, and the other of the second control valves is configured to control the refrigerant communication between the refrigerant inlet of the gas-liquid separator and the refrigerant inlet of the fourth heat exchanger.

[0021] Optionally, the thermal management system further comprises an evaporator and a condenser, wherein the refrigerant inlet of the evaporator is provided with a twelfth electronic expansion valve and is in communicable and interruptible communication with the refrigerant outlet of the liquid reservoir, the refrigerant outlet of the evaporator is in communication with the refrigerant inlet of the gas-liquid separator, the refrigerant inlet of the condenser is provided with a thirteenth electronic expansion valve and is in communicable and interruptible communication with the refrigerant outlet of the liquid reservoir, and the refrigerant outlet of the condenser is in communication with the refrigerant outlet of the compressor.

[0022] The second aspect of the present disclosure provides a battery assembly comprising the thermal management system described above.

[0023] The third aspect of the present disclosure provides a power consumption device comprising the battery assembly described above.

[0024] By the above technical solution, at least two heat exchange pipelines are arranged in the heat exchange unit, and adjacent heat exchange pipelines are arranged in parallel, and a heat exchanger is arranged on each heat exchange pipeline, and the number of heat exchangers in at least one heat exchange pipeline is multiple and arranged in series. For example, for a plurality of battery packs of different sizes, the heat exchange amount of battery packs of different sizes is different, the heat exchangers corresponding to different battery packs can be first arranged in series in the heat exchange pipeline, then the adjacent heat exchange pipelines are arranged in parallel, and the refrigerant pressure and / or flow in each heat exchange pipeline is adjusted by the adjusting unit, so that the refrigerant pressure loss deviation between each heat exchange pipeline is within a preset range, thereby uniformly heat exchanging the heat exchangers on each heat exchange pipeline, so that the batteries located on the heat exchangers can be uniformly cooled.

[0025] Other features and advantages of the present disclosure will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0027] FIG. 1 is a flowchart of a first embodiment of a thermal management system provided in an exemplary embodiment of the present disclosure;

[0028] FIG. 2 is a flowchart of a second embodiment of a thermal management system provided in an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0029] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0030] In the present disclosure, the terms "first", "second", etc. are used to distinguish one element from another element, and do not have sequentiality and importance. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0031] In the related art, as the automobile power battery develops towards high capacity and high charging rate, higher requirements are put forward for the power and response speed of the battery heating and cooling of the whole vehicle. Due to the layout space of the new energy vehicle, the battery assembly may have a combination form of multiple battery packs or special-shaped battery packs. The number of battery cells of the battery packs is different, which leads to a large difference in the heat exchange demand of the corresponding direct cooling plate for the battery packs, and the resistance deviation between different battery packs is large. The saturation temperature of the refrigerant inlet and outlet in the corresponding direct cooling plate is large, which easily leads to a larger temperature deviation between the battery packs, and reduces the overall performance of the battery assembly.

[0032] To solve the above technical problems, as shown in FIGS. 1-2, the first aspect of the present disclosure provides a thermal management system 1000, comprising: a heat exchange unit 1 and an adjusting unit 3, wherein the heat exchange unit 1 comprises at least two heat exchange pipelines, adjacent heat exchange pipelines are connected in parallel, a heat exchanger 2 is arranged on each heat exchange pipeline, and the number of heat exchangers 2 in at least one heat exchange pipeline is multiple and connected in series, and the adjusting unit 3 is configured to adjust the heat exchange amount of each heat exchange pipeline by adjusting the pressure and / or flow of the refrigerant in the heat exchange pipeline.

[0033] Through the above technical solution, at least two heat exchange pipelines are arranged in the heat exchange unit 1, and adjacent heat exchange pipelines are connected in parallel. A heat exchanger 2 is arranged on each heat exchange pipeline, and the number of heat exchangers 2 in at least one heat exchange pipeline is multiple and connected in series. For example, for multiple battery packs of different sizes, the heat exchange amounts of battery packs of different sizes are different. The heat exchangers 2 corresponding to different battery packs can be connected in series in the heat exchange pipeline, and then the adjacent heat exchange pipelines are connected in parallel. By distributing the heat exchangers 2 in each heat exchange pipeline and adjusting the pressure and / or flow of the refrigerant in each heat exchange pipeline by the adjusting unit 3, the heat exchange amounts in each heat exchange pipeline are approximately equal or equal, and the refrigerant pressure deviation of each heat exchange pipeline is within a preset range. Thus, the refrigerant inlet and outlet saturation temperature of the heat exchanger 2 can be controlled within a preset range, and the battery located on the heat exchanger 2 can be uniformly cooled by the refrigerant in the heat exchanger 2, so as to control the temperature of each battery pack within a preset range, thereby improving the performance of the whole battery assembly.

[0034] In order to control the deviation value between the heat exchange amounts of each heat exchange pipeline within a preset range, in some implementable ways, the deviation value between the heat exchange amounts of each heat exchange pipeline is not greater than 30%.

[0035] In some embodiments, the heat exchange units 1 can include a first heat exchange pipeline 11, a second heat exchange pipeline 12 and a third heat exchange pipeline 13 arranged in parallel, and the heat exchangers 2 include a first heat exchanger 21, a second heat exchanger 22 and a third heat exchanger 23, the first heat exchanger 21 is arranged in the first heat exchange pipeline 11 and used for heat exchange of the first battery pack 100, the second heat exchanger 22 is arranged in the second heat exchange pipeline 12 and used for heat exchange of the second battery pack 200, and the third heat exchanger 23 is arranged in the third heat exchange pipeline 13 and used for heat exchange of the third battery pack 300, wherein the heat exchange amounts of the first heat exchanger 21, the second heat exchanger 22 and the third heat exchanger 23 are different. In this embodiment, the heat exchange amounts of the first heat exchanger 21, the second heat exchanger 22 and the third heat exchanger 23 are determined according to the number of battery cells of the first battery pack 100, the second battery pack 200 and the third battery pack 300 which are in heat exchange with the first heat exchanger 21, the second heat exchanger 22 and the third heat exchanger 23, respectively. For example, the first battery pack 100 has the least number of battery cells, the second battery pack 200 has a moderate number of battery cells, and the third battery pack 300 has the most number of battery cells, so that the heat exchange amount of the first heat exchanger 21 is the least, the heat exchange amount of the second heat exchanger 22 is moderate, and the heat exchange amount of the third heat exchanger 23 is the most. In order to make the flow and pressure of the refrigerant in the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 tend to be the same or similar, at this time, the total number of battery cells of the first battery pack 100 in the first heat exchange pipeline 11, the total number of battery cells of the second battery pack 200 in the second heat exchange pipeline 12 and the total number of battery cells of the third battery pack 300 in the third heat exchange pipeline 13 are similar or the same.

[0036] In some embodiments, the heat exchange units 1 can include a first heat exchange pipeline 11, a second heat exchange pipeline 12 and a third heat exchange pipeline 13 arranged in parallel, and the heat exchangers 2 include a first heat exchanger 21, a second heat exchanger 22 and a third heat exchanger 23, the first heat exchanger 21 is arranged in the first heat exchange pipeline 11 and used for heat exchange of the first battery pack 100, the second heat exchanger 22 is arranged in the second heat exchange pipeline 12 and used for heat exchange of the second battery pack 200, and the third heat exchanger 23 is arranged in the third heat exchange pipeline 13 and used for heat exchange of the third battery pack 300, wherein the heat exchange amounts of the first heat exchanger 21, the second heat exchanger 22 and the third heat exchanger 23 are different. In this embodiment, the heat exchange amounts of the first heat exchanger 21, the second heat exchanger 22 and the third heat exchanger 23 are determined according to the number of battery cells of the first battery pack 100, the second battery pack 200 and the third battery pack 300 which are in heat exchange with the first heat exchanger 21, the second heat exchanger 22 and the third heat exchanger 23, respectively. For example, the first battery pack 100 has the least number of battery cells, the second battery pack 200 has a moderate number of battery cells, and the third battery pack 300 has the most number of battery cells, so that the heat exchange amount of the first heat exchanger 21 is the least, the heat exchange amount of the second heat exchanger 22 is moderate, and the heat exchange amount of the third heat exchanger 23 is the most. In order to make the flow and pressure of the refrigerant in the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 tend to be the same or similar, at this time, the total number of battery cells of the first battery pack 100 in the first heat exchange pipeline 11, the total number of battery cells of the second battery pack 200 in the second heat exchange pipeline 12 and the total number of battery cells of the third battery pack 300 in the third heat exchange pipeline 13 are similar or the same.

[0037] In some embodiments, in order to reduce the number of heat exchange pipelines and facilitate the adjustment of the refrigerant pressure and flow of each heat exchange pipeline, the first heat exchanger 21 is provided in multiple numbers and arranged in series in the first heat exchange pipeline 11, and the second heat exchanger 22 is provided in multiple numbers and arranged in series in the second heat exchange pipeline 12. The heat exchange capacity of the first heat exchanger 21 is less than that of the second heat exchanger 22. As shown in FIG. 1, the first heat exchanger 21 is provided in three numbers, and the three first heat exchangers 21 are arranged in series in the first heat exchange pipeline 11. The first heat exchanger 21 corresponds to four battery cells of the first battery pack 100. The second heat exchanger 22 is provided in two numbers, and the two second heat exchangers 22 are arranged in series in the second heat exchange pipeline 12. The second heat exchanger corresponds to six battery cells of the second battery pack 200. The third heat exchanger 23 is provided in one number, and the third heat exchanger corresponds to twelve battery cells. Thus, the heat exchange capacity of the first heat exchange pipeline 11, the heat exchange capacity of the second heat exchange pipeline 12, and the heat exchange capacity of the third heat exchange pipeline 13 are the same. Thus, through the series arrangement of the multiple first heat exchangers 21 and the series arrangement of the multiple second heat exchangers 22, it is possible to avoid arranging a corresponding heat exchange pipeline for each first heat exchanger 21 and each second heat exchanger 22. At the same time, through the series arrangement of the first heat exchanger 21 and the second heat exchanger 22, it is also convenient to control the refrigerant pressure and flow in the first heat exchange pipeline 11 and the second heat exchange pipeline 12. For example, by controlling the setting control valve of the refrigerant inlet and the refrigerant outlet of the first heat exchange pipeline 11, the refrigerant flow and the refrigerant pressure of the entire first heat exchange pipeline 11 can be controlled by controlling the valve opening degree of the control valve. Similarly, a corresponding control valve can also be arranged at the refrigerant inlet and the refrigerant outlet of the second heat exchange pipeline 12, and the refrigerant flow and the refrigerant pressure of the entire second heat exchange pipeline 12 can be controlled by controlling the valve opening degree of the control valve.

[0038] It can be understood that the number of the first battery pack 100, the second battery pack 200, and the third battery pack 300 and the number of battery cells in each battery pack are illustrative. In other embodiments, the number of battery cells of the first battery pack 100, the second battery pack 200, and the third battery pack 300 can be other values, and the number of the first battery pack 100 arranged in series in the first heat exchange pipeline 11 and the number of the second battery pack 200 arranged in series in the second heat exchange pipeline 12 can also be other values. Of course, the first battery pack 100 and the second battery pack 200 can also be mixed and arranged in different heat exchange pipelines, as long as the total number of battery cells in each heat exchange pipeline is similar or equal.

[0039] To facilitate the adjustment of the pressure and flow of the refrigerant in the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13, in some embodiments, the adjustment unit 3 includes a first adjustment assembly 31 arranged in the first heat exchange pipeline 11, a second adjustment assembly 32 arranged in the second heat exchange pipeline 12, and a third adjustment assembly 33 arranged in the third heat exchange pipeline 13. The first adjustment assembly 31, the second adjustment assembly 32 and the third adjustment assembly 33 respectively adjust the pressure and flow of the refrigerant in the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13.

[0040] In some embodiments, the first adjustment assembly 31 includes a first electronic expansion valve 311, a second electronic expansion valve 312, a first temperature sensor 313 and a first pressure temperature sensor 314. The first electronic expansion valve 311 and the first temperature sensor 313 are both located at the refrigerant inlet of the first heat exchange pipeline 11. The flow of the refrigerant into the first heat exchange pipeline 11 is controlled by the valve opening degree of the first electronic expansion valve 311, and the temperature of the refrigerant at the inlet of the first heat exchange pipeline 11 is measured by the first temperature sensor 313. The second electronic expansion valve 312 and the first pressure temperature sensor 314 are both located at the refrigerant outlet of the first heat exchange pipeline 11. The pressure of the refrigerant in the first heat exchange pipeline 11 is controlled by the valve opening degree of the second electronic expansion valve 312, and the temperature and pressure at the outlet of the first heat exchange pipeline 11 are measured by the first pressure temperature sensor 314.

[0041] Of course, the second adjustment assembly 32 includes a third electronic expansion valve 321, a fourth electronic expansion valve 322, a second temperature sensor 323 and a second pressure temperature sensor 324. The third electronic expansion valve 321 and the second temperature sensor 323 are both located at the refrigerant inlet of the second heat exchange pipeline 12. The flow of the refrigerant into the second heat exchange pipeline 12 is controlled by the valve opening degree of the third electronic expansion valve 321, and the temperature of the refrigerant at the inlet of the second heat exchange pipeline 12 is measured by the second temperature sensor 323. The fourth electronic expansion valve 322 and the second pressure temperature sensor 324 are both located at the refrigerant outlet of the second heat exchange pipeline 12. The flow of the refrigerant into the second heat exchange pipeline 12 is controlled by the valve opening degree of the third electronic expansion valve 321, the pressure of the refrigerant in the second heat exchange pipeline 12 is controlled by the valve opening degree of the fourth electronic expansion valve 322, and the temperature and pressure at the outlet of the second heat exchange pipeline 12 are measured by the second pressure temperature sensor 324.

[0042] In addition, the third adjusting assembly 33 comprises a fifth electronic expansion valve 331, a sixth electronic expansion valve 332, a third temperature sensor 333 and a third pressure temperature sensor 334. The fifth electronic expansion valve 331 and the third temperature sensor 333 are both located at the refrigerant inlet of the third heat exchange pipeline 13. The refrigerant flow into the third heat exchange pipeline 13 is controlled by the valve opening degree of the fifth electronic expansion valve 331, and the refrigerant temperature at the inlet of the third heat exchange pipeline 13 is measured in real time by the third temperature sensor 333. The sixth electronic expansion valve 332 and the third pressure temperature sensor 334 are both located at the refrigerant outlet of the third heat exchange pipeline 13. The refrigerant pressure in the third heat exchange pipeline 13 is controlled by the valve opening degree of the sixth electronic expansion valve 332, and the temperature and pressure at the outlet of the third heat exchange pipeline 13 are measured in real time by the third pressure temperature sensor 334.

[0043] When the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 cool and exchange heat with the first battery pack 100 corresponding to the first heat exchanger 21, the second battery pack 200 corresponding to the second heat exchanger 22 and the third battery pack 300 corresponding to the third heat exchanger 23, first, according to the number of the first battery pack 100, the second battery pack 200 and the third battery pack 300 and the number of the battery cells in each battery pack, the heat exchange amount of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 is allocated to be approximately equal or equal. Thus, the preset target value of the required heat exchange amount of each heat exchange pipeline is obtained, the pressure of the first heat exchange pipeline 11 is controlled by the second electronic expansion valve 312, and the pressure value is displayed in real time by the first pressure temperature sensor 314. When the pressure value of the first pressure temperature sensor 314 is in the preset pressure range, the valve opening of the second electronic expansion valve 312 stops adjusting, the refrigerant flow of the first heat exchange pipeline 11 is controlled by the valve opening of the first electronic expansion valve 311, the refrigerant temperature at the outlet of the first heat exchange pipeline 11 is measured in real time by the first pressure temperature sensor 314, and whether the superheat degree of the refrigerant of the first heat exchange pipeline 11 is in the preset range is judged by subtracting the pressure value of the first pressure temperature sensor 314 in the preset pressure range from the refrigerant temperature at the outlet of the first heat exchange pipeline 11 to convert the corresponding saturation temperature in the pressure state. It should be noted that the superheat degree is an important parameter in the refrigeration system, when the superheat degree is greater than the preset value, the first electronic expansion valve 311 opens the valve opening to increase the flow of the refrigerant, so that the superheat degree decreases, when the superheat degree is less than the set value, the first electronic expansion valve 311 reduces the valve opening to reduce the flow of the refrigerant, so that the superheat degree rises, and finally the superheat degree is in the preset range. In this embodiment, if the superheat degree of the refrigerant of the first heat exchange pipeline 11 is in the preset range, at this time, the valve opening of the first electronic expansion valve 311 stops adjusting, the heat exchange amount of the first heat exchange pipeline 11 is in the preset range, and the refrigerant flow and the refrigerant pressure of the second heat exchange pipeline 12 and the third heat exchange pipeline 13 can be adjusted by referring to the first heat exchange pipeline 11. Finally, the deviation between the heat exchange amounts of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 is not greater than 30%, so that the first battery pack 100, the second battery pack 200 and the third battery pack 300 can be uniformly cooled, and the temperature of the whole battery assembly is in the preset range.

[0044] It can be understood that, in order to facilitate the introduction of the refrigerant into the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13, the inlets of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 can be communicated with the first refrigerant conveying pipeline 150, so that the low-temperature liquid refrigerant is conveyed into the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 through the first refrigerant conveying pipeline 150.

[0045] In some embodiments, the deviation value between the heat exchange amounts of the heat exchange pipelines is equal to the ratio of the difference between the maximum value of the heat exchange amounts of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 and the minimum value of the heat exchange amounts of the three pipelines to the maximum value of the heat exchange amounts of the three pipelines. For example, the heat exchange amount of the first heat exchange pipeline 11 is Qa, the heat exchange amount of the second heat exchange pipeline 12 is Qb, the heat exchange amount of the third heat exchange pipeline 13 is Qc, and the deviation value between the heat exchange amounts of the heat exchange pipelines is A, where A = (max(Qa, Qb, Qc) - min(Qa, Qb, Qc)) / max(Qa, Qb, Qc), and A≤30%, preferably A≤20%.

[0046] When the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 heat exchange the first battery pack 100 corresponding to the first heat exchanger 21, the second battery pack 200 corresponding to the second heat exchanger 22 and the third battery pack 300 corresponding to the third heat exchanger 23, it can be understood that, in order to facilitate the introduction of high-temperature refrigerant into the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13, the outlet of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 can be communicated with the second refrigerant conveying pipeline 160. Thus, the high-temperature gaseous refrigerant is conveyed through the second refrigerant conveying pipeline 160 and moves in the opposite direction to the refrigerant during cooling, that is, flows from the refrigerant outlet of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 to the refrigerant inlet, so as to heat the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 corresponding to the first battery pack 100, the second battery pack 200 and the third battery pack 300. The pressure of the first heat exchange pipeline 11 is controlled by the second electronic expansion valve 312, and the pressure value and the temperature value are displayed in real time by the first pressure temperature sensor 314. When the pressure value of the first pressure temperature sensor 314 is in the preset pressure range, the valve opening of the second electronic expansion valve 312 stops adjusting. The refrigerant flow entering the first heat exchange pipeline 11 is controlled by the valve opening of the first electronic expansion valve 311. The refrigerant temperature of the first heat exchange pipeline 11 is measured in real time by the first temperature sensor 313. The refrigerant temperature of the first heat exchange pipeline 11 measured by the first temperature sensor 313 is converted into the corresponding saturation temperature at the pressure value when the first pressure temperature sensor 314 is in the preset pressure range, to determine whether the refrigerant supercooling degree of the first heat exchange pipeline 11 is in the preset range. It should be noted that the supercooling degree is an important parameter in the refrigeration system. When the supercooling degree is greater than the preset value, the first electronic expansion valve 311 increases the valve opening to increase the refrigerant flow, so that the supercooling degree decreases. When the supercooling degree is less than the set value, the first electronic expansion valve 311 reduces the valve opening to reduce the refrigerant flow, so that the supercooling degree increases, and finally the supercooling degree is in the preset range. In this embodiment, if the refrigerant supercooling degree of the first heat exchange pipeline 11 is in the preset range, at this time, the valve opening of the first electronic expansion valve 311 stops adjusting, and the heat exchange amount of the first heat exchange pipeline 11 is in the preset range. Similarly, the refrigerant flow and the refrigerant pressure of the second heat exchange pipeline 12 and the third heat exchange pipeline 13 can be adjusted by referring to the first heat exchange pipeline 11, so that the deviation between the heat exchange amounts of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 is not greater than 30%, so that the first battery pack 100, the second battery pack 200 and the third battery pack 300 can be uniformly heated, and the temperature of the whole battery assembly is in the preset range.

[0047] To facilitate the cooling or heating of the first battery pack 100, the second battery pack 200 and the third battery pack 300 by the thermal management system, in some implementable manners, the thermal management system further comprises a fourth heat exchanger 4, a gas-liquid separator 5, a liquid accumulator 6 and a compressor 7. The refrigerant outlet of the fourth heat exchanger 4 is provided with a seventh electronic expansion valve 41 and is in communication with the refrigerant inlet of each heat exchange pipeline, and the refrigerant inlet of the fourth heat exchanger 4 is selectively in communication with the refrigerant outlet of the compressor 7 or the refrigerant inlet of the compressor 7. The refrigerant inlet of the compressor 7 or the refrigerant outlet of the compressor 7 is selectively in communication with the refrigerant outlet of each heat exchange pipeline. The gas-liquid separator 5 is located between the refrigerant inlet of the compressor 7 and the outlet of each heat exchange pipeline, and the refrigerant inlet of the gas-liquid separator 5 is selectively in communication with the refrigerant outlet of the heat exchange pipeline or the refrigerant outlet of the compressor 7, and the refrigerant outlet of the gas-liquid separator 5 is in communication with the refrigerant inlet of the compressor 7. The liquid accumulator 6 is located between the fourth heat exchanger 4 and the refrigerant inlet of the heat exchange pipeline, the refrigerant inlet of the liquid accumulator 6 is selectively in communication with the refrigerant outlet of the fourth heat exchanger 4, and the refrigerant outlet of the liquid accumulator 6 is in communication with the refrigerant inlet of the heat exchange pipeline.

[0048] When the first battery pack 100, the second battery pack 200 and the third battery pack 300 need to be cooled, the low-temperature refrigerant in the liquid accumulator 6 enters the refrigerant inlet of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13, and is cooled and exchanged by the first heat exchanger 21, the second heat exchanger 22 and the third heat exchanger 23 to cool the corresponding first battery pack 100, the second battery pack 200 and the third battery pack 300. After heat exchange, the refrigerant is in a gaseous state and is discharged from the refrigerant outlet of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 and communicated with the refrigerant inlet of the gas-liquid separator 5. The high-temperature refrigerant is gas-liquid separated and enters the compressor 7, is compressed, is cooled and exchanged by the fourth heat exchanger 4, is throttled by the seventh electronic expansion valve 41 to form low-temperature liquid refrigerant, and enters the liquid accumulator 6 to circulate to cool and lower the temperature of the first battery pack 100, the second battery pack 200 and the third battery pack 300, so that the temperature of each battery pack is maintained within a predetermined range to maintain the performance of the battery assembly.

[0049] When the first battery pack 100, the second battery pack 200 and the third battery pack 300 need to be heated, the high-temperature refrigerant enters and is discharged from the refrigerant outlets of the respective heat exchange pipelines, at this time, the refrigerant is pressurized and heated by the refrigerant outlet of the compressor 7, and the refrigerant outlet of the compressor 7 is respectively communicated with the refrigerant outlets of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13. The high-temperature refrigerant enters the refrigerant outlets of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 and exchanges heat with the corresponding first battery pack 100, the second battery pack 200 and the third battery pack 300, and is then discharged from the refrigerant outlets of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13, enters the liquid accumulator 6, evaporates and absorbs heat through the seventh electronic expansion valve 41 and the fourth heat exchanger 4, and then returns to the gas-liquid separator 5, completing the refrigerant circulation of heating. In order to maintain the temperature of each battery pack in a predetermined range, the performance of the battery assembly is maintained.

[0050] In addition, when the first battery pack 100, the second battery pack 200 and the third battery pack 300 are heated, in order to quickly evaporate and absorb heat of the refrigerant to cool it down, the thermal management system further comprises a fifth heat exchanger 10, the refrigerant inlet of the fifth heat exchanger 10 is communicatable with the liquid accumulator 6, the refrigerant outlet of the fifth heat exchanger 10 is communicated with the gas-liquid separator 5, and the fifth heat exchanger 10 can be a plate heat exchanger. For example, the two ends of the heat exchange channel of the plate heat exchanger are respectively connected with the cooling circuit of the motor and the electronic control of the vehicle. When the battery or the cockpit has heating demand, the waste heat of the motor or the electronic control can be recovered to exchange heat with the refrigerant, the refrigerant passing through the fifth heat exchanger 10 enters the gas-liquid separator 5, and the high energy efficiency ratio of the entire thermal control system is realized.

[0051] In some embodiments, to facilitate the switching of the thermal management system to heat or cool the battery packs, the thermal management system further comprises a first switching assembly 8 in communication with the refrigerant outlet of the heat exchange pipeline, and the first switching assembly 8 is configured to selectively communicate the heat exchange pipeline with the refrigerant outlet of the compressor 7 or the refrigerant inlet of the gas-liquid separator 5. In this way, when the first battery pack 100, the second battery pack 200 and the third battery pack 300 need to be cooled, the low-temperature liquid refrigerant from the liquid reservoir 6 enters the refrigerant inlets of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 to cool the corresponding first battery pack 100, the second battery pack 200 and the third battery pack 300. The warmed refrigerant is communicated by the first switching assembly 8 to the refrigerant inlet of the gas-liquid separator 5, and the gas-liquid separated refrigerant enters the compressor 7 for compression and cooling by the fourth heat exchanger 4, and then enters the liquid reservoir 6 again through the seventh electronic expansion valve 41. Conversely, when the first battery pack 100, the second battery pack 200 and the third battery pack 300 need to be warmed, the flow direction of the refrigerant is reversed, and at this time, the refrigerant outlet of the heat exchange pipeline is communicated by the first switching assembly 8 with the refrigerant outlet of the compressor 7, and at this time, the high-temperature refrigerant compressed by the compressor 7 enters from the refrigerant outlets of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 to heat and warm the first battery pack 100, the second battery pack 200 and the third battery pack 300. The thermal management system further comprises a second switching assembly 9 in communication with the refrigerant inlet of the fourth heat exchanger 4. The second switching assembly 9 is configured to selectively communicate the refrigerant inlet of the fourth heat exchanger 4 with the refrigerant inlet of the gas-liquid separator 5 or the refrigerant outlet of the compressor 7.

[0052] In some specific embodiments, the first switching assembly 8 comprises two first control valves 81 arranged in parallel, wherein one first control valve 81 is used to control the on-off of the refrigerant outlet of the compressor 7 and the refrigerant outlet of the heat exchange pipeline, and the other first control valve 81 is used to control the on-off of the refrigerant inlet of the gas-liquid separator 5 and the refrigerant outlet of the heat exchange pipeline. The first control valve 81 can be an electromagnetic valve. In this way, the refrigerant outlet of the heat exchange pipeline is selectively communicated with the refrigerant outlet of the compressor 7 or the refrigerant inlet of the gas-liquid separator 5 by the on-off of the two first control valves 81, thereby facilitating the switching of the cooling or heating of the battery packs.

[0053] In addition, the first switching assembly 8 can also be a plurality of electronic expansion valves, for example, the first switching assembly 8 includes a ninth electronic expansion valve 82, a tenth electronic expansion valve 83, and an eleventh electronic expansion valve 84, wherein the ninth electronic expansion valve 82 is arranged at the refrigerant outlet of the first heat exchange pipeline 11 and is arranged in parallel with a second electronic expansion valve 312, the second electronic expansion valve 312 is used to control the opening and closing of the refrigerant inlet of the gas-liquid separator 5 and the first heat exchange pipeline 11, and the ninth electronic expansion valve 82 is used to control the opening and closing of the refrigerant outlet of the compressor 7 and the first heat exchange pipeline 11. In this way, when the battery pack needs to be cooled, the second electronic expansion valve 312 is opened and the ninth electronic expansion valve 82 is closed to make the refrigerant outlet of the first heat exchange pipeline 11 communicate with the refrigerant inlet of the gas-liquid separator 5, so that the high-temperature refrigerant after cooling the first battery pack 100 enters the gas-liquid separator 5. Conversely, when the battery pack needs to be heated, the ninth electronic expansion valve 82 is opened and the second electronic expansion valve 312 is closed to make the refrigerant outlet of the first heat exchange pipeline 11 communicate with the refrigerant outlet of the compressor 7, so that the high-temperature refrigerant enters the first heat exchange pipeline 11 from the refrigerant outlet of the first heat exchange pipeline 11 to heat the first battery pack 100.

[0054] Of course, the tenth electronic expansion valve 83 is arranged at the refrigerant outlet of the second heat exchange pipeline 12 and is arranged in parallel with a fourth electronic expansion valve 322, the fourth electronic expansion valve 322 is used to control the opening and closing of the refrigerant inlet of the gas-liquid separator 5 and the second heat exchange pipeline 12, and the tenth electronic expansion valve 83 is used to control the opening and closing of the refrigerant outlet of the compressor 7 and the second heat exchange pipeline 12. In this way, when the battery pack needs to be cooled, the fourth electronic expansion valve 322 is opened and the tenth electronic expansion valve 83 is closed to make the refrigerant outlet of the second heat exchange pipeline 12 communicate with the refrigerant inlet of the gas-liquid separator 5, so that the high-temperature refrigerant after cooling the second battery pack 200 enters the gas-liquid separator 5. Conversely, when the battery pack needs to be heated, the tenth electronic expansion valve 83 is opened and the fourth electronic expansion valve 322 is closed to make the refrigerant outlet of the second heat exchange pipeline 12 communicate with the refrigerant outlet of the compressor 7, so that the high-temperature refrigerant enters the second heat exchange pipeline 12 from the refrigerant outlet of the second heat exchange pipeline 12 to heat the second battery pack 200.

[0055] In addition, the eleventh electronic expansion valve 84 is arranged at the refrigerant outlet of the third heat exchange pipeline 13 and is arranged in parallel with the sixth electronic expansion valve 332, the sixth electronic expansion valve 332 is used to control the opening and closing of the refrigerant inlet of the gas-liquid separator 5 and the third heat exchange pipeline 13, and the eleventh electronic expansion valve 84 is used to control the opening and closing of the refrigerant outlet of the compressor 7 and the third heat exchange pipeline 13. In this way, when the battery pack needs to be cooled, the high-temperature refrigerant after cooling the third battery pack 300 is also introduced into the gas-liquid separator 5 by closing the eleventh electronic expansion valve 84 and opening the sixth electronic expansion valve 332 to make the refrigerant outlet of the third heat exchange pipeline 13 communicate with the refrigerant inlet of the gas-liquid separator 5. Conversely, when the battery pack needs to be heated, the high-temperature refrigerant is introduced into the third heat exchange pipeline 13 from the refrigerant outlet of the third heat exchange pipeline 13 to heat the third battery pack 300 by opening the eleventh electronic expansion valve 84 and closing the sixth electronic expansion valve 332 to make the refrigerant outlet of the third heat exchange pipeline 13 communicate with the refrigerant outlet of the compressor 7.

[0056] In some implementable manners, in order to facilitate the heat management system to switch to heat or cool the battery pack, the second switching assembly 9 includes two second control valves 91 arranged in parallel, which can be solenoid valves, wherein one second control valve 91 is used to control the opening and closing of the refrigerant inlet of the fourth heat exchanger 4 and the refrigerant outlet of the compressor 7, and the other second control valve 91 is used to control the opening and closing of the refrigerant inlet of the fourth heat exchanger 4 and the refrigerant inlet of the gas-liquid separator 5. In this way, the refrigerant inlet of the fourth heat exchanger 4 can be selectively communicated with the refrigerant outlet of the compressor 7 or the refrigerant inlet of the gas-liquid separator 5 by the opening and closing of the two second control valves 91, thereby facilitating the heat management system to switch to cool or heat the battery pack.

[0057] In some implementable manners, in order to facilitate the heat management system to cool or heat the battery pack, the heat management system further comprises an evaporator 110 and a condenser 120, for example, in a new energy vehicle, the evaporator 110 can be an in-vehicle evaporator, and the condenser 120 can be an in-vehicle condenser, a refrigerant inlet of the evaporator 110 is provided with a twelfth electronic expansion valve 130 and is in openable and closable communication with a refrigerant outlet of the liquid accumulator 6, a refrigerant outlet of the evaporator 110 is in communication with a refrigerant inlet of the gas-liquid separator 5, a refrigerant inlet of the condenser 120 is provided with a thirteenth electronic expansion valve 140 and is in openable and closable communication with the refrigerant outlet of the liquid accumulator 6, and a refrigerant outlet of the condenser 120 is in communication with a refrigerant outlet of the compressor 7. In this way, when it is necessary to cool the battery pack, the high-temperature gaseous refrigerant coming out of the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 enters the compressor 7 after passing through the gas-liquid separator 5 and is compressed, part of the compressed refrigerant at the outlet of the compressor 7 enters the fourth heat exchanger 4 and the seventh electronic expansion valve 41 to be throttled and cooled to form low-temperature liquid refrigerant which enters the liquid accumulator 6. Part of the compressed refrigerant enters the condenser 120 and the twelfth electronic expansion valve 130 to be throttled and cooled to form low-temperature liquid refrigerant which enters the liquid accumulator 6, and the low-temperature liquid refrigerant is divided from the liquid accumulator 6 to enter the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 to cool and heat the corresponding first battery pack 100, second battery pack 200 and third battery pack 300. Thus, by providing the condenser 120, the efficiency of forming low-temperature liquid refrigerant can be accelerated, so that there is enough low-temperature refrigerant to enter the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 to cool and heat the first battery pack 100, the second battery pack 200 and the third battery pack 300. When it is necessary to heat the battery pack, the high-temperature gaseous refrigerant from the refrigerant outlet of the compressor 7 enters the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13, respectively, to be cooled after heat exchange, part of the cooled refrigerant passes through the liquid accumulator 6, passes through the fourth heat exchanger 4 and the fifth heat exchanger 10 to be heat exchanged and enters the gas-liquid separator 5 again, and then enters the first heat exchange pipeline 11, the second heat exchange pipeline 12 and the third heat exchange pipeline 13 through the compressor 7. In this embodiment, part of the cooled refrigerant can also pass through the evaporator 110 to be heat exchanged and then enter the gas-liquid separator 5, so that the efficiency of forming high-temperature refrigerant is increased, so that the heat management system has enough high-temperature refrigerant to heat the battery pack.

[0058] The second aspect of the present disclosure provides a battery assembly comprising the thermal management system. The battery assembly can be cooled and heated by the thermal management system to control the temperature of each battery pack within a preset range, thereby reducing the temperature difference between the battery packs and avoiding the performance degradation of the battery assembly caused by the temperature difference. It should be noted that the battery assembly has all the advantages of the thermal management system, which will not be described here.

[0059] The third aspect of the present disclosure provides a power consuming device comprising the battery assembly. It should be noted that the power consuming device can be a new energy vehicle comprising the battery assembly. The battery assembly can uniformly cool or heat the battery packs in the battery assembly to make the temperature of each battery pack the same, thereby ensuring the use performance of the battery packs. Of course, the power consuming device is a new energy vehicle comprising the battery assembly, which is illustrative. In other embodiments, the power consuming device can also be in other forms, such as a power storage battery power consuming device.

[0060] The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0061] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0062] Furthermore, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A thermal management system (1000), characterized by, The heat management system comprises: a heat exchange unit (1) comprising at least two heat exchange pipelines, adjacent heat exchange pipelines are arranged in parallel, each heat exchange pipeline is provided with a heat exchanger (2), and the number of heat exchangers (2) in at least one heat exchange pipeline is multiple and arranged in series; and an adjusting unit (3) configured to adjust the heat exchange amount of each heat exchange pipeline by adjusting the refrigerant pressure and / or flow in the heat exchange pipeline.

2. The heat management system according to claim 1, wherein the deviation between the heat exchange amounts of each heat exchange pipeline is not more than 30%.

3. The heat management system according to claim 1 or 2, wherein the heat exchange amounts of the heat exchangers (2) in at least two heat exchange pipelines are different.

4. The heat management system according to any one of claims 1-3, wherein the heat exchange unit (1) comprises a first heat exchange pipeline (11), a second heat exchange pipeline (12) and a third heat exchange pipeline (13) arranged in parallel, the heat exchanger (2) comprises a first heat exchanger (21), a second heat exchanger (22) and a third heat exchanger (23), the first heat exchanger (21) is arranged in the first heat exchange pipeline (11) and used for heat exchange of a first battery pack (100), the second heat exchanger (22) is arranged in the second heat exchange pipeline (12) and used for heat exchange of a second battery pack (200), and the third heat exchanger (23) is arranged in the third heat exchange pipeline (13) and used for heat exchange of a third battery pack (300), wherein the heat exchange amounts of the first heat exchanger (21), the second heat exchanger (22) and the third heat exchanger (23) are different.

5. The heat management system according to claim 4, wherein the number of first heat exchangers (21) is multiple and arranged in series in the first heat exchange pipeline (11); the number of second heat exchangers (22) is multiple and arranged in series in the second heat exchange pipeline (12); wherein the heat exchange amount of the first heat exchanger (21) is less than that of the second heat exchanger (22).

6. The heat management system according to claim 4 or 5, wherein the adjusting unit (3) comprises a first adjusting assembly (31) arranged in the first heat exchange pipeline (11), a second adjusting assembly (32) arranged in the second heat exchange pipeline (12), and a third adjusting assembly (33) arranged in the third heat exchange pipeline (13), and the first adjusting assembly (31), the second adjusting assembly (32) and the third adjusting assembly (33) adjust the refrigerant pressure and flow in the first heat exchange pipeline (11), the second heat exchange pipeline (12) and the third heat exchange pipeline (13), respectively.

7. The heat management system according to claim 6, wherein The first regulating assembly (31) comprises a first electronic expansion valve (311), a second electronic expansion valve (312), a first temperature sensor (313) and a first pressure temperature sensor (314), the first electronic expansion valve (311) and the first temperature sensor (313) are located at the refrigerant inlet of the first heat exchange pipeline (11), the second electronic expansion valve (312) and the first pressure temperature sensor (314) are located at the refrigerant outlet of the first heat exchange pipeline (11); The second regulating assembly (32) comprises a third electronic expansion valve (321), a fourth electronic expansion valve (322), a second temperature sensor (323) and a second pressure temperature sensor (324), the third electronic expansion valve (321) and the second temperature sensor (323) are located at the refrigerant inlet of the second heat exchange pipeline (12), the fourth electronic expansion valve (322) and the second pressure temperature sensor (324) are located at the refrigerant outlet of the second heat exchange pipeline (12); The third regulating assembly (33) comprises a fifth electronic expansion valve (331), a sixth electronic expansion valve (332), a third temperature sensor (333) and a third pressure temperature sensor (334), the fifth electronic expansion valve (331) and the third temperature sensor (333) are located at the refrigerant inlet of the third heat exchange pipeline (13), the sixth electronic expansion valve (332) and the third pressure temperature sensor (334) are located at the refrigerant outlet of the third heat exchange pipeline (13).

8. The thermal management system according to any one of claims 4-7, characterized in that, the deviation value between the heat exchange amounts of the heat exchange pipelines is equal to the ratio of the difference between the maximum value of the heat exchange amounts of the first heat exchange pipeline (11), the second heat exchange pipeline (12) and the third heat exchange pipeline (13) and the minimum value of the heat exchange amounts of the three pipelines to the maximum value of the heat exchange amounts of the three pipelines.

9. The thermal management system according to claim 7, characterized in that, the thermal management system further comprises a fourth heat exchanger (4), a gas-liquid separator (5), a liquid accumulator (6) and a compressor (7), the refrigerant outlet of the fourth heat exchanger (4) is provided with a seventh electronic expansion valve (41) and is in communication with the refrigerant inlets of the heat exchange pipelines, the refrigerant inlet of the fourth heat exchanger (4) is selectively in on-off communication with the refrigerant outlet of the compressor (7) or the refrigerant inlet of the compressor (7); the refrigerant inlet of the compressor (7) or the refrigerant outlet of the compressor (7) is selectively in on-off communication with the refrigerant outlets of the heat exchange pipelines; the gas-liquid separator (5) is located between the refrigerant inlet of the compressor (7) and the outlets of the heat exchange pipelines, the refrigerant inlet of the gas-liquid separator (5) is selectively in on-off communication with the refrigerant outlets of the heat exchange pipelines or the refrigerant outlet of the compressor (7), and the refrigerant outlet of the gas-liquid separator (5) is in communication with the refrigerant inlet of the compressor (7); The accumulator (6) is located between the fourth heat exchanger (4) and the refrigerant inlet of the heat exchange pipeline, the refrigerant inlet of the accumulator (6) is in intermittent communication with the refrigerant outlet of the fourth heat exchanger (4), and the refrigerant outlet of the accumulator (6) is in communication with the refrigerant inlet of the heat exchange pipeline.

10. The thermal management system of claim 9, wherein, The thermal management system further comprises a fifth heat exchanger (10), the refrigerant inlet of the fifth heat exchanger (10) is provided with an eighth electronic expansion valve (101) and is in communication with the accumulator (6), and the refrigerant outlet of the fifth heat exchanger (10) is in communication with the gas-liquid separator (5).

11. The thermal management system of claim 9 or 10, wherein, The thermal management system further comprises a first switching assembly (8) in communication with the refrigerant outlet of the heat exchange pipeline, and the first switching assembly (8) is configured to selectively communicate the heat exchange pipeline with the refrigerant outlet of the compressor (7) or the refrigerant inlet of the gas-liquid separator (5).

12. The thermal management system of claim 11, wherein, The thermal management system further comprises a second switching assembly (9) in communication with the refrigerant inlet of the fourth heat exchanger (4), and the second switching assembly (9) is configured to selectively communicate the refrigerant inlet of the fourth heat exchanger (4) with the refrigerant inlet of the gas-liquid separator (5) or the refrigerant outlet of the compressor (7).

13. The thermal management system of claim 11 or 12, wherein, The first switching assembly (8) comprises two first control valves (81) arranged in parallel, one of the first control valves (81) is used to control the communication between the refrigerant outlet of the compressor (7) and the refrigerant outlet of the heat exchange pipeline, and the other first control valve (81) is used to control the communication between the gas-liquid separator (5) and the refrigerant outlet of the heat exchange pipeline.

14. The thermal management system of claim 11 or 12, wherein, The first switching assembly (8) comprises a ninth electronic expansion valve (82), a tenth electronic expansion valve (83), and an eleventh electronic expansion valve (84), The ninth electronic expansion valve (82) is arranged at the refrigerant outlet of the first heat exchange pipeline (11) and is arranged in parallel with the second electronic expansion valve (312), the second electronic expansion valve (312) is used to control the communication between the first heat exchange pipeline (11) and the refrigerant inlet of the gas-liquid separator (5), and the ninth electronic expansion valve (82) is used to control the communication between the first heat exchange pipeline (11) and the refrigerant outlet of the compressor (7). The tenth electronic expansion valve (83) is arranged at the refrigerant outlet of the second heat exchange pipeline (12) and is arranged in parallel with the fourth electronic expansion valve (322) for controlling the opening and closing of the second heat exchange pipeline (12) and the refrigerant inlet of the gas-liquid separator (5), and the tenth electronic expansion valve (83) is used for controlling the opening and closing of the second heat exchange pipeline (12) and the refrigerant outlet of the compressor (7). The eleventh electronic expansion valve (84) is arranged at the refrigerant outlet of the third heat exchange pipeline (13) and is arranged in parallel with the sixth electronic expansion valve (332) for controlling the opening and closing of the third heat exchange pipeline (13) and the refrigerant inlet of the gas-liquid separator (5), and the eleventh electronic expansion valve (84) is used for controlling the opening and closing of the third heat exchange pipeline (13) and the refrigerant outlet of the compressor (7).

15. The thermal management system of claim 12, wherein The second switching assembly (9) comprises two second control valves (91) arranged in parallel, wherein one of the second control valves (91) is used for controlling the opening and closing of the refrigerant outlet of the compressor (7) and the refrigerant inlet of the fourth heat exchanger (4), and the other of the second control valves (91) is used for controlling the opening and closing of the refrigerant inlet of the gas-liquid separator (5) and the refrigerant inlet of the fourth heat exchanger (4).

16. The thermal management system of any one of claims 9-15, wherein The thermal management system further comprises an evaporator (110) and a condenser (120), The refrigerant inlet of the evaporator (110) is provided with a twelfth electronic expansion valve (130) and is in openable and closable communication with the refrigerant outlet of the liquid accumulator (6), and the refrigerant outlet of the evaporator (110) is in communication with the refrigerant inlet of the gas-liquid separator (5), The refrigerant inlet of the condenser (120) is provided with a thirteenth electronic expansion valve (140) and is in openable and closable communication with the refrigerant outlet of the liquid accumulator (6), and the refrigerant outlet of the condenser (120) is in communication with the refrigerant outlet of the compressor (7).

17. A battery assembly characterized by, The thermal management system of any one of claims 1-16.

18. An electrical device, characterized by The battery assembly of claim 17.

Images