Thermal management system, battery assembly and electric equipment

Abstract

The utility model relates to a heat management system, a battery assembly and electric equipment, the heat management system comprises a heat exchange unit and an adjusting unit, the heat exchange unit comprises at least two heat exchange pipelines, the heat exchange pipelines are arranged in parallel, heat exchange branches are arranged on the heat exchange pipelines, at least one heat exchange pipeline comprises at least two heat exchange branches, the heat exchange branches are arranged in parallel, and the heat exchange branches are arranged in parallel. A heat exchanger is arranged on each heat exchange branch; the adjusting unit comprises a first adjusting assembly, the first adjusting assembly and the heat exchange branches connected in parallel are arranged in series, and the first adjusting assembly is configured to be capable of adjusting the refrigerant pressure and / or flow in the same heat exchange pipeline so as to adjust the heat exchange amount of the heat exchange pipeline. Thus, the refrigerant pressure deviation between the heat exchange pipelines arranged in parallel is within the preset range, so that the heat exchangers on the heat exchange branches in the heat exchange pipelines can uniformly exchange heat, the situation that the battery performance is reduced due to the too large temperature difference is avoided, and the stability of the battery is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery pack thermal management, and specifically, to a thermal management system, a battery assembly, and an electrical device. Background Art

[0002] For electrical devices such as new energy vehicles, with the development of automotive power batteries towards high power and high charging rate, there are higher requirements for the power and response speed of vehicle battery heating and cooling. Due to the limited layout space of the vehicle, when multiple battery packs or special-shaped battery packs are involved, there is a huge gap in the heat exchange requirements between the cold plates used for heat exchange of the battery packs. The different sizes of the battery packs result in a large difference in the pressure loss of each cold plate, thereby affecting the temperature uniformity of the battery packs. Summary of the Utility Model

[0003] The purpose of the present disclosure is to provide a thermal management system, a battery assembly, and an electrical device. The deviation value between the heat exchange amounts of each heat exchange pipeline in the thermal management system is within a preset range to improve the stability of the battery, so as to at least partially solve the above technical problems.

[0004] To achieve the above purpose, in the first aspect of the present disclosure, a thermal management system is provided, including: a heat exchange unit, including at least two heat exchange pipelines, the heat exchange pipelines are arranged in parallel, heat exchange branches are provided on the heat exchange pipelines, at least one of the heat exchange pipelines includes at least two of the heat exchange branches, the heat exchange branches are arranged in parallel, and heat exchangers are provided on each of the heat exchange branches; and an adjustment unit, the adjustment unit includes a first adjustment component, the first adjustment component is arranged in series with the heat exchange branches after being connected in parallel, and the first adjustment component is configured to be able to adjust the refrigerant pressure and / or flow rate in the heat exchange pipeline of the same circuit to adjust the heat exchange amount of the heat exchange pipeline.

[0005] Optionally, the deviation value between the heat exchange amounts in the heat exchange pipelines is not greater than 30%.

[0006] Optionally, the heat exchange amounts of the heat exchangers in at least two of the heat exchange branches are different.

[0007] Optionally, the heat exchange unit includes a first heat exchange pipeline, a second heat exchange pipeline, and a third heat exchange pipeline arranged in parallel. The first heat exchange pipeline includes a plurality of first heat exchange branches arranged in parallel. The second heat exchange pipeline includes a plurality of second heat exchange branches arranged in parallel. The first heat exchange pipeline and the second heat exchange pipeline are connected in parallel and then connected in parallel with the third heat exchange pipeline. The heat exchanger includes a first heat exchanger disposed in each of the first heat exchange branches and used for heat exchange of the first battery pack, a second heat exchanger disposed in the second heat exchange branch and used for heat exchange of the second battery pack, and a third heat exchanger disposed in the third heat exchange pipeline and used for heat exchange of the third battery pack. Among them, the heat exchange capacity of the second heat exchanger is greater than that of the first heat exchanger, and the heat exchange capacity of the second heat exchanger is less than that of the third heat exchanger.

[0008] Optionally, the adjustment unit further includes a second adjustment component and a third adjustment component. The second adjustment component is connected in series with the heat exchange pipelines after being connected in parallel. The second adjustment component is configured to be able to cooperate with the first adjustment component to adjust the refrigerant pressure and / or flow rate in the heat exchange pipeline that is not in the same path as the first adjustment component, so as to adjust the heat exchange capacity of the heat exchange pipeline. The third adjustment component is disposed in each heat exchange branch. The third adjustment component is configured to be able to adjust the refrigerant pressure and / or flow rate in each heat exchange branch, so as to adjust the heat exchange capacity of the heat exchange branch.

[0009] Optionally, the first adjustment component includes a first electronic expansion valve and a first pressure and temperature sensor. The first electronic expansion valve and the first pressure and temperature sensor are located at the refrigerant outlet after a plurality of first heat exchange branches are connected in parallel. The second adjustment component includes a second electronic expansion valve, a second pressure and temperature sensor, a third electronic expansion valve, and a third pressure and temperature sensor. The second electronic expansion valve and the second pressure and temperature sensor are located at the refrigerant outlet after the first heat exchange pipeline and the second heat exchange pipeline are connected in parallel. The third electronic expansion valve and the third pressure and temperature sensor are located at the refrigerant outlet after the first heat exchange pipeline and the second heat exchange pipeline are connected in parallel and then connected in parallel with the third heat exchange pipeline. The third adjustment component includes a plurality of fourth electronic expansion valves, a plurality of first temperature sensors, and a plurality of second temperature sensors. Among them, a plurality of the fourth electronic expansion valves and the first temperature sensors are respectively located at the refrigerant inlets of the first heat exchange branch, the second heat exchange branch, and the third heat exchange pipeline. A plurality of the second temperature sensors are respectively located at the refrigerant outlets of the first heat exchange branch, the second heat exchange branch, and the third heat exchange pipeline.

[0010] Optionally, the thermal management system further includes a fourth heat exchanger, a gas-liquid separator, a liquid reservoir, and a compressor. A fifth electronic expansion valve is provided at the refrigerant outlet of the fourth heat exchanger and is connected to the refrigerant inlet of the liquid reservoir. The refrigerant inlet of the fourth heat exchanger is selectively and commutably connected to the refrigerant outlet of the compressor or the refrigerant inlet of the gas-liquid separator; the refrigerant inlet of the compressor is connected to the refrigerant outlet of the gas-liquid separator, and the refrigerant outlet of the compressor is further connected to the third electronic expansion valve; the refrigerant inlet of the gas-liquid separator is further connected to the third electronic expansion valve; the refrigerant outlet of the liquid reservoir is connected to the refrigerant inlets of the respective heat exchange pipelines.

[0011] Optionally, the thermal management system further includes a fifth heat exchanger. A sixth electronic expansion valve is provided at the refrigerant inlet of the fifth heat exchanger and is connected to the refrigerant inlet of the liquid reservoir. The refrigerant outlet of the fifth heat exchanger is connected to the refrigerant inlet of the gas-liquid separator.

[0012] Optionally, the thermal management system further includes a first switching component connected to the third electronic expansion valve. The first switching component is configured to selectively connect the third electronic expansion valve to the refrigerant outlet of the compressor or the refrigerant inlet of the gas-liquid separator.

[0013] Optionally, the thermal management system further includes a second switching component connected to the refrigerant inlet of the fourth heat exchanger. The second switching component is configured to selectively connect the refrigerant inlet of the fourth heat exchanger to the refrigerant inlet of the gas-liquid separator or the refrigerant outlet of the compressor.

[0014] Optionally, the first switching component includes two first control valves arranged in parallel. One of the first control valves is used to control the connection and disconnection between the refrigerant outlet of the compressor and the third electronic expansion valve, and the other first control valve is used to control the connection and disconnection between the gas-liquid separator and the refrigerant outlet after the second heat exchange pipeline and the third heat exchange pipeline are connected in parallel.

[0015] Optionally, the first switching component includes a seventh electronic expansion valve. The seventh electronic expansion valve is arranged in parallel with the third electronic expansion valve. The third electronic expansion valve is used to control the connection and disconnection between the refrigerant outlet after the second heat exchange pipeline and the third heat exchange pipeline are connected in parallel and the refrigerant inlet of the gas-liquid separator, and the seventh electronic expansion valve is used to control the connection and disconnection between the refrigerant outlet after the second heat exchange pipeline and the third heat exchange pipeline are connected in parallel and the refrigerant outlet of the compressor.

[0016] Optionally, the second switching component includes two second control valves arranged in parallel. One of the second control valves is used to control the on-off of the refrigerant outlet of the compressor and the refrigerant inlet of the fourth heat exchanger, and the other second control valve is used to control the on-off of the refrigerant inlet of the gas-liquid separator and the refrigerant inlet of the fourth heat exchanger.

[0017] Optionally, the thermal management system further includes an evaporator and a condenser. The refrigerant inlet of the evaporator is provided with an eighth electronic expansion valve and is communicably connected to the refrigerant outlet of the liquid storage device. The refrigerant outlet of the evaporator is connected to the refrigerant inlet of the gas-liquid separator. The refrigerant inlet of the condenser is provided with a ninth electronic expansion valve and is communicably connected to the refrigerant outlet of the liquid storage device. The refrigerant outlet of the condenser is connected to the refrigerant outlet of the compressor.

[0018] A second aspect of the present disclosure provides a battery assembly, including the above thermal management system.

[0019] A third aspect of the present disclosure provides an electrical device, including the above battery assembly.

[0020] Through the above technical solutions, through at least two heat exchange pipelines in the heat exchange unit, the heat exchange pipelines are arranged in parallel and heat exchange branches are arranged on the heat exchange pipelines. Heat exchangers are provided on each heat exchange branch. At least one heat exchange pipeline includes two heat exchange branches, and the heat exchange branches are arranged in parallel. For example, for multiple battery packs of different sizes, the heat exchange amounts of the battery packs of different sizes are different. The heat exchangers corresponding to different multiple battery packs can be first connected in parallel in the corresponding heat exchange pipelines, and then the first adjustment component in the adjustment unit is connected in series with the heat exchange branches after parallel connection, and then the heat exchange pipelines are arranged in parallel. The refrigerant pressure and / or flow rate in the heat exchange pipelines of the same circuit are adjusted through the first adjustment component to adjust the heat exchange amount of the heat exchange pipelines, so that the deviation of the refrigerant pressure between the heat exchange pipelines arranged in parallel is within a preset range, so as to enable the heat exchangers on the heat exchange branches in each heat exchange pipeline to exchange heat evenly, so that the temperature of the battery located on the heat exchanger is maintained within a preset range, avoiding a too large temperature difference from causing a decline in battery performance and improving the stability of the battery.

[0021] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific implementation manners, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0023] Figure 1 is a flowchart of the first implementation manner of the thermal management system provided in the exemplary implementation manner of the present disclosure;

[0024] Figure 2 It is a flowchart of the second implementation manner of the thermal management system provided in the exemplary implementation manners of the present disclosure.

[0025] Description of Reference Numerals

[0026] 1 - Heat exchange unit; 11 - First heat exchange pipeline; 111 - First heat exchange branch; 12 - Second heat exchange pipeline; 121 - Second heat exchange branch; 13 - Third heat exchange pipeline; 2 - Heat exchanger; 21 - First heat exchanger; 22 - Second heat exchanger; 23 - Third heat exchanger; 3 - Regulation unit; 31 - First regulation component; 311 - First electronic expansion valve; 312 - First pressure and temperature sensor; 32 - Second regulation component; 321 - Second electronic expansion valve; 322 - Second pressure and temperature sensor; 323 - Third electronic expansion valve; 324 - Third pressure and temperature sensor; 33 - Third regulation component; 331 - Fourth electronic expansion valve; 332 - First temperature sensor; 333 - Second temperature sensor; 4 - Fourth heat exchanger; 41 - Fifth electronic expansion valve; 5 - Gas - liquid separator; 6 - Liquid accumulator; 7 - Compressor; 8 - Fifth heat exchanger; 81 - Sixth electronic expansion valve; 9 - First switching component; 91 - First control valve; 92 - Seventh electronic expansion valve; 10 - Second switching component; 101 - Second control valve; 110 - Evaporator; 120 - Condenser; 130 - Eighth electronic expansion valve; 140 - Ninth electronic expansion valve; 150 - First refrigerant delivery pipeline; 160 - Second refrigerant delivery pipeline; 100 - First battery pack; 200 - Second battery pack; 300 - Third battery pack. Detailed Implementation Manner

[0027] The following will describe the detailed implementation manners of the present disclosure with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only for explaining and illustrating the present disclosure, and are not used to limit the present disclosure.

[0028] In the present disclosure, the terms "first", "second", etc. are used to distinguish one element from another, and do not have sequentiality and importance. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] In the related art, due to the limited layout space of new - energy vehicles, there are multiple battery packs or a combination of irregular - shaped battery packs in the battery assembly. Different numbers of battery cells in the battery packs result in significant differences in the heat - exchange requirements of the direct - cooling plates for heat - exchanging the corresponding battery packs, leading to large resistance deviations between different battery packs, large saturation temperatures at the refrigerant inlet and outlet in the corresponding direct - cooling plates, and easily causing a larger temperature deviation between battery packs, thereby reducing the overall performance of the battery assembly.

[0030] To solve the above technical problems, as Figure 1 and Figure 2 shown, a first aspect of the present disclosure provides a thermal management system, including: a heat exchange unit 1 and an adjustment unit 3, wherein the heat exchange unit 1 includes at least two heat exchange pipelines arranged in parallel, at least one heat exchange branch is provided on each heat exchange pipeline, and a plurality of heat exchange branches located in the same heat exchange pipeline are arranged in parallel. A heat exchanger 2 is provided on each heat exchange branch. The adjustment unit 3 includes a first adjustment component 31, a second adjustment component 32 and a third adjustment component 33. The first adjustment component 31 is provided on each heat exchange branch, and the first adjustment component 31 is configured to be able to adjust the refrigerant flow rate in the heat exchange branch. The second adjustment component 32 is provided in one of two adjacent heat exchange pipelines, and the second adjustment component 32 is configured to be able to adjust the refrigerant pressure in each heat exchange branch in the same heat exchange pipeline. The third adjustment component 33 is provided at the refrigerant outlets of two adjacent heat exchange pipelines to adjust the deviation value between the heat exchange amounts in each heat exchange pipeline within a preset range.

[0031] Through the above technical solution, through at least two heat exchange pipelines in the heat exchange unit 1, the heat exchange pipelines are arranged in parallel and heat exchange branches are provided on the heat exchange pipelines. A heat exchanger 2 is provided on each heat exchange branch. At least one heat exchange pipeline includes two heat exchange branches, and the heat exchange branches are arranged in parallel. For example, for multiple battery packs of different sizes, the heat exchange amounts of the battery packs of different sizes are different. The heat exchangers 2 corresponding to different multiple battery packs can be first connected in parallel in the corresponding heat exchange pipelines, and then the first adjustment component 31 in the adjustment unit 3 is connected in series with the parallel heat exchange branches, and then the heat exchange pipelines are arranged in parallel. The first adjustment component 31 is used to adjust the refrigerant pressure and / or flow rate in the heat exchange pipelines in the same circuit to adjust the heat exchange amount of the heat exchange pipeline, so as to enable the deviation of the refrigerant pressure between the parallel heat exchange pipelines to be within a preset range, so that the heat exchangers 2 on the corresponding heat exchange branches in each heat exchange pipeline can exchange heat evenly, so that the temperature of the battery located on the heat exchanger 2 is maintained within a preset range, avoiding the decrease of battery performance caused by too large temperature difference and improving the stability of the battery.

[0032] 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%.

[0033] In some implementable ways, the heat exchange unit 1 may include a first heat exchange pipeline 11, a second heat exchange pipeline 12, and a third heat exchange pipeline 13 arranged in parallel. The first heat exchange pipeline 11 includes a plurality of first heat exchange branches 111 arranged in parallel. The second heat exchange pipeline 12 includes a plurality of second heat exchange branches 121 arranged in parallel. After the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are arranged in parallel, they are then arranged in parallel with the third heat exchange pipeline 13. The heat exchanger 2 includes a first heat exchanger 21 disposed in each first heat exchange branch 111 and used for heat exchange of the first battery pack 100, a second heat exchanger 22 disposed in the second heat exchange branch 121 and used for heat exchange of the second battery pack 200, and a third heat exchanger 23 disposed in the third heat exchange pipeline 13 and used for heat exchange of the third battery pack 300. Among them, the heat exchange amount of the second heat exchanger 22 is greater than that of the first heat exchanger 21, and the heat exchange amount of the second heat exchanger 22 is less than that of the third heat exchanger 23. In this embodiment, the heat exchange capacities 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 that exchanges heat with the first heat exchanger 21, the second battery pack 200 that exchanges heat with the second heat exchanger 22, and the third battery pack 300 that exchanges heat with the third heat exchanger 23. For example, the number of battery cells of the first battery pack 100 is the least, the number of battery cells of the second battery pack 200 is in the middle, and the number of battery cells of the third battery pack 300 is the most, so that the heat exchange capacity of the first heat exchanger 21 is the smallest, the heat exchange capacity of the second heat exchanger 22 is in the middle, and the heat exchange capacity of the third heat exchanger 23 is the largest. In order to make the refrigerant flow rate and pressure 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 plurality of first battery packs 100 in the first heat exchange pipeline 11, the total number of battery cells of the plurality of second battery packs 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. In this implementation manner, as Figure 1 shown, the number of battery cells of the first battery pack 100 in the first heat exchange pipeline 11 is 4, the number of battery cells of the second battery pack 200 is 6, and the number of battery cells of the third battery pack 300 is 12. Thus, in order to make the heat exchange amounts of the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 tend to be the same, at this time, the number of the first heat exchangers 21 in the first heat exchange pipeline 11 is three, the number of the second heat exchangers 22 in the second heat exchange pipeline 12 is two, and the number of the third heat exchangers 23 in the third heat exchange pipeline 13 is one. Thus, the number of the first heat exchange branches 111 in the first heat exchange pipeline 11 is three, and the number of the second heat exchange branches 121 in the second heat exchange pipeline 12 is two.

[0034] It can be understood that the numbers of the first heat exchangers 21 in the first heat exchange pipeline 11, the second heat exchangers 22 in the second heat exchange pipeline 12, and the third heat exchangers 23 in the third heat exchange pipeline 13 are schematic. In other embodiments, the numbers of the first heat exchangers 21, the second heat exchangers 22, and the third heat exchangers 23 can also be other numbers, as long as the heat exchange amounts of the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 tend to be the same.

[0035] In some feasible embodiments, for the convenience of adjusting the refrigerant pressure and flow rate of each heat exchange pipeline and each heat exchange branch, the adjusting unit 3 further includes a second adjusting component 32 and a third adjusting component 33. The second adjusting component 32 is serially arranged with the heat exchange pipelines after being paralleled. The second adjusting component 32 is configured to be able to cooperate with the first adjusting component 31 to adjust the refrigerant pressure and / or flow rate in the heat exchange pipeline that is not in the same path as the first adjusting component 31, so as to adjust the heat exchange amount of this heat exchange pipeline; the third adjusting component 33 is arranged in each heat exchange branch, and the third adjusting component 33 is configured to be able to adjust the refrigerant pressure and / or flow rate in each heat exchange branch, so as to adjust the heat exchange amount of this heat exchange branch.

[0036] Specifically, the first adjusting component 31 includes a first electronic expansion valve 311 and a first pressure and temperature sensor 312. The first electronic expansion valve 311 and the first pressure and temperature sensor 312 are located at the refrigerant outlet after multiple first heat exchange branches 111 are paralleled; the second adjusting component 32 includes a second electronic expansion valve 321, a second pressure and temperature sensor 322, a third electronic expansion valve 323, and a third pressure and temperature sensor 324. The second electronic expansion valve 321 and the second pressure and temperature sensor 322 are located at the refrigerant outlet after the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are paralleled, and the third electronic expansion valve 323 and the third pressure and temperature sensor 324 are located at the refrigerant outlet after the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are paralleled and then paralleled with the third heat exchange pipeline 13; the third adjusting component 33 includes multiple fourth electronic expansion valves 331, multiple first temperature sensors 332, and multiple second temperature sensors 333. Among them, the multiple fourth electronic expansion valves 331 and the first temperature sensors 332 are respectively located at the refrigerant inlets of the first heat exchange branch 111, the second heat exchange branch 121, and the third heat exchange pipeline 13, and the multiple second temperature sensors 333 are respectively located at the refrigerant outlets of the first heat exchange branch 111, the second heat exchange branch 121, and the third heat exchange pipeline 13.

[0037] Such as Figure 1As shown, in a specific embodiment, there are three first heat exchangers 21, and the three first heat exchangers 21 are respectively arranged on corresponding first heat exchange branches 111. The three first heat exchange branches 111 are arranged in parallel. The number of battery cells of the first battery pack 100 corresponding to the first heat exchanger 21 is four. The number of second heat exchangers 22 is two, and the two second heat exchangers 22 are respectively arranged on corresponding second heat exchange branches 121. The number of battery cells of the second battery pack 200 corresponding to the second heat exchanger is six. The number of third heat exchangers 23 is one, and the third heat exchanger 23 is arranged on the corresponding third heat exchange pipeline 13. The number of battery cells of the third heat exchanger is twelve. According to the equality of the total number of battery cells of the corresponding multiple first battery packs 100, the total number of battery cells of the multiple second battery packs 200, and the number of battery cells of the third battery pack 300, the heat exchange amounts in the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 are made the same. Of course, in this embodiment, the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are connected in parallel and then connected in parallel with the third heat exchange pipeline 13. Thus, by adjusting the fourth electronic expansion valve 331 in the third adjustment component 33, the refrigerant flow rate entering each heat exchange branch can be adjusted. The first temperature sensor 332 and the second temperature sensor 333 in the third adjustment component 33 are respectively used to monitor the refrigerant temperatures on both sides of the first heat exchanger 21, the second heat exchanger 22, and the third heat exchanger 23 in real time. The first electronic expansion valve 311 in the first adjustment component 31 is arranged at the intersection after the three first heat exchange branches 111 are connected in parallel. The first pressure temperature sensor 312 is used to measure the refrigerant pressure in the first heat exchange pipeline 11, and the first electronic expansion valve 311 is used to adjust the refrigerant pressure in the first heat exchange pipeline 11. The second electronic expansion valve 321 in the second adjustment component 32 cooperates with the first electronic expansion valve 311 to adjust the refrigerant pressure in the second heat exchange pipeline 12. The second pressure temperature sensor 322 is used to measure the refrigerant pressure and refrigerant temperature after the first heat exchange pipeline 11 and the second heat exchange pipeline are connected in parallel. The third electronic expansion valve 323 in the second adjustment component 32 cooperates with the second electronic expansion valve 321 to adjust the refrigerant pressure in the third heat exchange pipeline 13. The third pressure temperature sensor 324 is used to measure the refrigerant pressure and refrigerant temperature after the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are connected in parallel and then connected in parallel with the third heat exchange pipeline 13. Thus, through the cooperation of the first adjustment component 31, the second adjustment component 32, and the third adjustment component 33, it is convenient to adjust the refrigerant pressure and flow rate of the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13. By using the third electronic expansion valve 323 and the second electronic expansion valve 321 in cooperation, and the second electronic expansion valve 321 and the first electronic expansion valve 311 in cooperation, the number of electronic expansion valves for controlling the refrigerant pressure in the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 is reduced, and the cost is lowered.

[0038] It can be understood that the quantities of the above-mentioned first battery pack 100, second battery pack 200, and third battery pack 300, as well as the number of battery cells in each battery pack, are all illustrative. In other embodiments, the number of battery cells in the first battery pack 100, second battery pack 200, and third battery pack 300 can be other values.

[0039] When the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 perform cooling heat exchange on 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 allocate according to the quantities 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, so that the heat exchange of the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 requires the preset heat exchange quantity of the first heat exchange pipeline 11 through the quantity of the first heat exchange pipeline 11, and the heat exchange quantities in the second heat exchange pipeline 12 and the third heat exchange pipeline 13 are approximately equal or equal, thereby obtaining the preset target value of the required heat exchange quantity of each heat exchange pipeline. Control the pressure of the refrigerant at the refrigerant outlet where the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are connected in parallel and then connected in parallel with the third heat exchange pipeline 13 through the third electronic expansion valve 323, and use the third pressure and temperature sensor 324 to measure in real time the pressure and temperature of the refrigerant at the refrigerant outlet where the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are connected in parallel and then connected in parallel with the third heat exchange pipeline 13 controlled by the third electronic expansion valve 323. Adjust the pressure of the refrigerant at the refrigerant outlet where the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are connected in parallel and then connected in parallel with the third heat exchange pipeline 13 to be within the preset range through the valve opening of the third electronic expansion valve 323. At the same time, control the pressure of the refrigerant after the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are connected in parallel through the second electronic expansion valve 321, and use the second pressure and temperature sensor 322 to measure in real time the pressure of the refrigerant at the refrigerant outlet after the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are connected in parallel. Control the pressure of the refrigerant at the refrigerant outlet after the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are connected in parallel by controlling the valve opening of the second electronic expansion valve 321. In this way, the refrigerant pressure of the parallel connection of the first heat exchange pipeline 11 and the second heat exchange pipeline 12 can be controlled through the cooperation of the third electronic expansion valve 323 and the second electronic expansion valve 321. Control the refrigerant pressure in the first heat exchange pipeline 11 through the first electronic expansion valve 311, and control the refrigerant pressure in the second heat exchange pipeline 12 through the cooperation of the second electronic expansion valve 321 and the first electronic expansion valve 311. Thus, the refrigerant with a lower temperature enters from the refrigerant inlets of the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13. The refrigerant with a lower temperature cools down the first battery pack 100 through the first heat exchange branch 111 on the first heat exchange pipeline 11, the refrigerant with a lower temperature cools down the second battery pack 200 through the second heat exchange branch 121 on the second heat exchange pipeline 12, and the refrigerant with a lower temperature cools down the third battery pack 300 through the third heat exchange pipeline 13. Monitor in real time the pressure and temperature of the refrigerant at the refrigerant outlet where the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are connected in parallel and then connected in parallel with the third heat exchange pipeline 13 through the third pressure and temperature sensor 324. When the pressure value of the third pressure and temperature sensor 324 is not within the preset pressure range,By adjusting the valve opening of the third electronic expansion valve 323 so that the pressure value measured by the third pressure and temperature sensor 324 is within a preset range, at this time, the valve opening of the third electronic expansion valve 323 is fixed. At this time, the pressure and temperature of the refrigerant outlet after the parallel connection of the first heat exchange pipeline 11 and the second heat exchange pipeline 12 are monitored in real time through the second pressure and temperature sensor 322. When the pressure value measured by the second pressure and temperature sensor 322 is not within the preset range, the valve opening of the second electronic expansion valve 321 is controlled so that the pressure value measured by the second pressure and temperature sensor 322 is within the preset range. At this time, the refrigerant pressure of the third heat exchange pipeline 13 is also within the preset range. In addition, the pressure and temperature of the refrigerant outlet of the first heat exchange pipeline 11 are monitored in real time through the first pressure and temperature sensor 312. When the pressure value measured by the first pressure and temperature sensor 312 is not within the preset range, the valve opening of the first electronic expansion valve 311 is controlled to adjust the refrigerant pressure of the first heat exchange pipeline 11 so that the pressure value measured by the first pressure and temperature sensor 312 falls within the preset range. In this way, the refrigerant pressures of the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 can be adjusted to the preset range. At this time, the saturation temperature of the refrigerant corresponding to this pressure can be calculated through the pressure values corresponding to the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13. The temperatures of the refrigerant outlets entering each of the three first heat exchange branches 111 in the first heat exchange pipeline 11, the two second heat exchange branches 121 in the second heat exchange pipeline 12, and the third heat exchange pipeline 13 are measured through the corresponding second temperature sensors 333, so as to calculate the superheat degrees corresponding to each of the first battery packs 100, each of the second battery packs 200, and the third battery pack 300 corresponding to each of the first heat exchange branches 111, each of the second heat exchange branches 121, and the third heat exchange pipeline 13, and the valve opening of the fourth electronic expansion valve 331 on the corresponding first heat exchange branch 111, second heat exchange branch 121, and third heat exchange pipeline 13 is adjusted to control the refrigerant flow rate entering, so that the superheat degrees of the refrigerant in each of the first heat exchange branches 111, second heat exchange branches 121, and third heat exchange pipeline 13 are within the preset range, so as to be able to uniformly cool each of the first battery packs 100, each of the second battery packs 200, and the third battery pack 300, so that the temperatures of the first battery pack 100, the second battery pack 200, and the third battery pack 300 are similar or equal, thereby improving the stability of the battery pack.

[0040] It should be noted that superheat is an important parameter in the refrigeration system. When the superheat is greater than the preset value, the fourth electronic expansion valve 331 will open to increase the refrigerant flow rate, causing the superheat to decrease. When the superheat is less than the set value, the fourth electronic expansion valve 331 will reduce the valve opening to decrease the refrigerant flow rate, causing the superheat to increase, ultimately keeping the superheat within the preset range. In this embodiment, if the superheat of the refrigerant in the first heat exchange branch 111 of the first heat exchange pipeline 11 corresponding to the first battery pack 100 is within the preset range, at this time, the valve opening of the fourth electronic expansion valve 331 is stopped from being adjusted, and the heat exchange amount of the first heat exchange branch 111 is within the preset range. Similarly, the refrigerant flow rate and refrigerant pressure of the second heat exchange pipeline 12 and the third heat exchange pipeline 13 can be adjusted with reference to the first heat exchange pipeline 11, so that the deviation value 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%, thereby enabling uniform heat dissipation of the first battery pack 100, the second battery pack 200, and the third battery pack 300, keeping the overall temperature of the battery assembly within the preset range, and improving the stability of the battery.

[0041] It can be understood that, for the convenience of introducing 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 all be connected to the first refrigerant delivery pipeline 150, so as to respectively deliver the lower-temperature liquid refrigerant to the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 through the first refrigerant delivery pipeline 150.

[0042] In some implementable ways, 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. Among them, (max(Qa, Qb, Qc) - min(Qa, Qb, Qc)) / max(Qa, Qb, Qc) = A ≤ 30%, preferably, A ≤ 20%.

[0043] When the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 perform heating and heat exchange on 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, the gaseous refrigerant at a higher temperature is respectively transported in the opposite direction to the refrigerant during cooling, that is, it flows from the refrigerant outlets of the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 towards the refrigerant inlets, so as to heat the first battery pack 100, the second battery pack 200, and the third battery pack 300 corresponding to the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13. The control of the refrigerant pressure in the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 during heating can refer to the control method during cooling, which will not be elaborated here. At this time, the saturation temperature of the refrigerant corresponding to this pressure can be calculated through the pressure values corresponding to the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13. The temperature of the refrigerant entering each of the three first heat exchange branches 111 in the first heat exchange pipeline 11, the two second heat exchange branches 121 in the second heat exchange pipeline 12, and the refrigerant inlet of the third heat exchange pipeline 13 is measured by the first temperature sensors 332 corresponding to the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13, so as to calculate the supercooling degrees corresponding to the first battery pack 100, the second battery pack 200, and the third battery pack 300 corresponding to each of the first heat exchange branches 111, each of the second heat exchange branches 121, and the third heat exchange pipeline 13, and the valve opening degrees of the fourth electronic expansion valves 331 on the corresponding first heat exchange branches 111, second heat exchange branches 121, and third heat exchange pipeline 13 are adjusted to control the refrigerant flow rate, so that the supercooling degrees of the refrigerant in each of the first heat exchange branches 111, second heat exchange branches 121, and third heat exchange pipeline 13 are within a preset range, so as to be able to uniformly heat each of the first battery pack 100, the second battery pack 200, and the third battery pack 300, so that the temperatures of the first battery pack 100, the second battery pack 200, and the third battery pack 300 are close or equal, thereby improving the stability of the battery pack.

[0044] It should be noted that the degree of supercooling is an important parameter in the refrigeration system. When the degree of supercooling is greater than the preset value, the fourth electronic expansion valve 331 will increase the valve opening to increase the refrigerant flow rate, so as to reduce the degree of supercooling. When the degree of supercooling is less than the set value, the fourth electronic expansion valve 331 will decrease the valve opening to reduce the refrigerant flow rate, so as to increase the degree of supercooling, and finally make the degree of supercooling within the preset range. In this embodiment, if the refrigerant supercooling degree of the first heat exchange pipeline 11 is within the preset range, at this time, the adjustment of the valve opening of the fourth electronic expansion valve 331 is stopped, and the heat exchange amount of the first heat exchange pipeline 11 is within the preset range. Similarly, the refrigerant flow rate and refrigerant pressure of the second heat exchange pipeline 12 and the third heat exchange pipeline 13 can be adjusted with reference to the first heat exchange pipeline 11, so that the deviation value 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 as to uniformly heat the first battery pack 100, the second battery pack 200 and the third battery pack 300, and make the temperature of the whole battery assembly within the preset range.

[0045] In order 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 ways, the thermal management system further includes a fourth heat exchanger 4, a gas-liquid separator 5, a liquid accumulator 6 and a compressor 7. Among them, a fifth electronic expansion valve 41 is provided at the refrigerant outlet of the fourth heat exchanger 4 and is connected to the refrigerant inlet of the liquid accumulator 6. The refrigerant inlet of the fourth heat exchanger 4 is selectively and commutably connected to the refrigerant outlet of the compressor 7 or the refrigerant inlet of the gas-liquid separator 5. The refrigerant inlet of the compressor 7 is connected to the refrigerant outlet of the gas-liquid separator 5. The refrigerant outlet of the compressor 7 is also connected to the third electronic expansion valve 323. The refrigerant inlet of the gas-liquid separator 5 is also connected to the third electronic expansion valve 323. The refrigerant outlet of the liquid accumulator 6 is connected to the refrigerant inlets of each heat exchange pipeline.

[0046] When it is necessary to cool the first battery pack 100, the second battery pack 200, and the third battery pack 300, the refrigerant with a lower temperature in the liquid receiver 6 enters through the refrigerant inlets of the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13, and passes through the first heat exchangers 21 corresponding to the first battery pack 100 on each first heat exchange branch 111 in the first heat exchange pipeline 11, the second heat exchangers 22 corresponding to the second battery pack 200 on each second heat exchange branch 121 in the second heat exchange pipeline 12, and the third heat exchanger 23 to perform cooling heat exchange on the corresponding third battery pack 300. After the heat exchange and temperature rise, the refrigerant becomes gaseous and passes through the fourth electronic expansion valve 331 from the refrigerant outlet of the first heat exchange branch 111 of the first heat exchange pipeline 11, then is connected in parallel with the second heat exchange branch 121 in the second heat exchange pipeline 12 and passes through the second electronic expansion valve 321. After passing through the second electronic expansion valve 321, it is connected in parallel with the third heat exchange pipeline 13, and after the parallel connection, it enters the third electronic expansion valve 323 and is connected to the refrigerant inlet of the gas-liquid separator 5. The refrigerant with a higher temperature undergoes gas-liquid separation and enters the compressor 7 for compression. After heat exchange and cooling through the fourth heat exchanger 4, it passes through the fifth electronic expansion valve 41 for throttling to form a refrigerant with a lower temperature in a liquid state and enters the liquid receiver 6, so that the refrigerant with a lower temperature in a liquid state is drained from the liquid receiver 6 into the corresponding first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 to circulate and cool the first battery pack 100, the second battery pack 200, and the third battery pack 300, so as to maintain the temperature of each battery pack within a preset range and maintain the performance of the battery assembly.

[0047] When it is necessary to heat the first battery pack 100, the second battery pack 200, and the third battery pack 300, refrigerant at a relatively high temperature enters from the refrigerant outlets of each heat exchange pipeline and discharges from the refrigerant outlets of each heat exchange pipeline. At this time, the refrigerant is pressurized and heated up at the refrigerant outlet of the compressor 7, and the refrigerant outlet of the compressor 7 is 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 relatively high-temperature refrigerant is first shunted after passing through the third electronic expansion valve 323. Part of the refrigerant enters the third heat exchange pipeline 13 to heat the third battery pack 300, and the rest of the refrigerant passes through the second electronic expansion valve 321. The refrigerant passing through the second electronic expansion valve 321 is shunted again. Part of the refrigerant enters the two second heat exchange branches 121 in the second heat exchange pipeline 12 to heat the second battery pack 200, and the rest of the refrigerant passes through the first electronic expansion valve 311. The refrigerant passing through the first electronic expansion valve 311 is shunted and enters the three corresponding first heat exchange branches 111 in the first heat exchange pipeline 11 to heat the first battery pack 100. The refrigerant after heating converges from the refrigerant inlets of the third heat exchange pipeline 13, the second heat exchange branches 121, and the first heat exchange branches 111 into the first refrigerant delivery pipeline 150 and enters the accumulator 6. The refrigerant in the accumulator 6 returns to the gas-liquid separator 5 after absorbing heat by evaporation through the fifth electronic expansion valve 41 and the fourth heat exchanger 4, completing the heating refrigerant cycle to heat each battery pack so that the temperature of each battery pack is maintained within a preset range to maintain the performance of the battery assembly.

[0048] In addition, when heating the first battery pack 100, the second battery pack 200, and the third battery pack 300, in order to quickly evaporate and absorb heat to cool the refrigerant, the thermal management system further includes a fifth heat exchanger 8. The refrigerant inlet of the fifth heat exchanger 8 is provided with a sixth electronic expansion valve 81 and is communicated with the refrigerant inlet of the accumulator 6. The refrigerant outlet of the fifth heat exchanger 8 is communicated with the refrigerant inlet of the gas-liquid separator 5. The fifth heat exchanger 8 can be a plate heat exchanger. For example, the two ends of the heat exchange channels of the plate heat exchanger are respectively connected to the cooling circuits of the motor and the electronic control of the vehicle. When there is a heating requirement for the battery or the cockpit, the waste heat of the motor or the electronic control can be recovered to exchange heat with the refrigerant. The sixth electronic expansion valve 81 can control the on-off between the fifth heat exchanger 8 and the accumulator 6. The refrigerant passing through the fifth heat exchanger 8 enters the gas-liquid separator 5, realizing a high energy efficiency ratio of the entire thermal control system.

[0049] In some implementable embodiments, to facilitate the thermal management system to switch between heating and cooling the battery pack, the thermal management system further includes a first switching component 9 communicated with the third electronic expansion valve 323. The first switching component 9 is configured to selectively communicate the third electronic expansion valve 323 with the refrigerant outlet of the compressor 7 or the refrigerant inlet of the gas-liquid separator 5. Thus, when it is necessary to cool the first battery pack 100, the second battery pack 200, and the third battery pack 300, the lower-temperature liquid refrigerant enters the refrigerant inlets of the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 from the liquid storage device 6 to cool the corresponding first battery pack 100, second battery pack 200, and third battery pack 300. After the refrigerant temperature rises, the first switching component 9 communicates the refrigerant outlets of each heat exchange pipeline with the refrigerant inlet of the gas-liquid separator 5. The refrigerant after gas-liquid separation enters the compressor 7 for compression and is cooled by the fourth heat exchanger 4 and throttled by the fifth electronic expansion valve 41 and then enters the liquid storage device 6 again. Conversely, when it is necessary to heat the first battery pack 100, the second battery pack 200, and the third battery pack 300, the flow direction of the refrigerant is opposite. At this time, the first switching component 9 switches the refrigerant outlet of the heat exchange pipeline to communicate with the refrigerant outlet of the compressor 7. At this time, the higher-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 raise the temperature of the first battery pack 100, the second battery pack 200, and the third battery pack 300. The thermal management system further includes a second switching component 10 communicated with the refrigerant inlet of the fourth heat exchanger 4. The second switching component 10 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.

[0050] In some specific embodiments, the first switching component 9 includes two first control valves 91 arranged in parallel. One of the first control valves 91 is used to control the on-off of the refrigerant outlet of the compressor 7 and the third electronic expansion valve 323, and the other first control valve 91 is used to control the on-off of the refrigerant outlet of the gas-liquid separator 5 after being connected in parallel with the second heat exchange pipeline 12 and the third heat exchange pipeline 13. Among them, the first control valve 91 can be a solenoid valve. Thus, by the on-off of the two first control valves 91, the refrigerant outlet of the heat exchange pipeline can be selectively communicated with the refrigerant outlet of the compressor 7 or the refrigerant inlet of the gas-liquid separator 5, so as to facilitate the switching between cooling and heating of the battery pack.

[0051] In addition, the first switching component 9 can also be an electromagnetic control valve. For example, the first switching component 9 includes a seventh electronic expansion valve 92. The seventh electronic expansion valve 92 is arranged in parallel with the third electronic expansion valve 323. The third electronic expansion valve 323 is used to control the on-off of the refrigerant outlet after the parallel connection of the second heat exchange pipeline 12 and the third heat exchange pipeline 13 and the refrigerant inlet of the gas-liquid separator 5. The seventh electronic expansion valve 92 is used to control the on-off of the refrigerant outlet after the parallel connection of the second heat exchange pipeline 12 and the third heat exchange pipeline 13 and the refrigerant outlet of the compressor 7. In this way, when it is necessary to cool the battery pack, the seventh electronic expansion valve 92 is closed and the third electronic expansion valve 323 is opened so that the refrigerant after heat exchange with the battery pack cooling enters the gas-liquid separator 5 through the refrigerant inlet of the gas-liquid separator 5. On the contrary, when it is necessary to heat the battery pack, the seventh electronic expansion valve 92 is opened and the third electronic expansion valve 323 is closed so that the refrigerant outlet after the parallel connection of the first heat exchange pipeline 11 and the second heat exchange pipeline 12 and then the parallel connection with the third heat exchange pipeline 13 is communicated with the refrigerant outlet of the compressor 7. Thus, the relatively high-temperature refrigerant is branched by the seventh electronic expansion valve 92 into the third heat exchange pipeline 13 to heat the third battery pack 300, enters the two second heat exchange branches 121 in the second heat exchange pipeline 12 to heat the corresponding second battery pack 200, and enters the three first heat exchange branches 111 in the first heat exchange pipeline 11 to heat the corresponding first battery pack 100.

[0052] In some implementable ways, in order to facilitate the heat management system to switch between heating and cooling the battery pack, the second switching component 10 includes two second control valves 101 arranged in parallel. The second control valve 101 can be a solenoid valve. One of the second control valves 101 is used to control the on-off of the refrigerant outlet of the compressor 7 and the refrigerant inlet of the fourth heat exchanger 4. The other second control valve 101 is used to control the on-off of the refrigerant inlet of the gas-liquid separator 5 and the refrigerant inlet of the fourth heat exchanger 4. In this way, by the on-off of the two second control valves 101, 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, thus facilitating the heat management system to switch between cooling and heating the battery pack.

[0053] In some feasible embodiments, to facilitate the cooling or heating of the battery pack by the thermal management system, the thermal management system further includes 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. The refrigerant inlet of the evaporator 110 is provided with an eighth electronic expansion valve 130 and is communicably connected to the refrigerant outlet of the accumulator 6. The refrigerant outlet of the evaporator 110 is connected to the refrigerant inlet of the gas-liquid separator 5. The refrigerant inlet of the condenser 120 is provided with a ninth electronic expansion valve 140 and is communicably connected to the refrigerant outlet of the accumulator 6. The refrigerant outlet of the condenser 120 is connected to the refrigerant outlet of the compressor 7. Thus, when it is necessary to cool the battery pack, the higher-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 for compression after passing through the gas-liquid separator 5. Part of the compressed refrigerant at the refrigerant outlet of the compressor 7 enters the fourth heat exchanger 4 and the fifth electronic expansion valve 41 for throttling and temperature reduction to form a lower-temperature liquid refrigerant and enters the accumulator 6. Part of the compressed refrigerant enters the condenser 120 and the ninth electronic expansion valve 140 for throttling and temperature reduction to form a lower-temperature liquid refrigerant and enters the accumulator 6. The lower-temperature liquid refrigerant is shunted from the accumulator 6 and enters the first heat exchange branch 111 in the first heat exchange pipeline 11, the second heat exchange branch 121 in the second heat exchange pipeline 12, and the third heat exchange pipeline 13 respectively to cool and lower the temperature of the corresponding first battery pack 100, second battery pack 200, and third battery pack 300. Thus, by setting the condenser 120, the efficiency of forming a lower-temperature liquid refrigerant can be accelerated, so that there is enough lower-temperature refrigerant to cool and lower the temperature of the first battery pack 100, second battery pack 200, and third battery pack 300. When it is necessary to heat the battery pack, the higher-temperature gaseous refrigerant respectively passes through the third electronic expansion valve 323 from the refrigerant outlet of the compressor 7 and enters the third heat exchange pipeline 13, the second heat exchange branch 121 in the second heat exchange pipeline 12, and the first heat exchange branch 111 in the first heat exchange pipeline 11 to heat the corresponding battery packs. After heat exchange, the refrigerant temperature drops. Part of the cooled refrigerant passes through the accumulator 6, exchanges heat through the fourth heat exchanger 4 and the fifth heat exchanger 8, enters the gas-liquid separator 5, and then enters the first heat exchange pipeline 11, the second heat exchange pipeline 12, and the third heat exchange pipeline 13 again through the compressor 7 to heat the battery pack. In this embodiment, part of the cooled refrigerant can also pass through the evaporator 110, exchange heat, and then enter the gas-liquid separator 5, thereby accelerating the efficiency of forming a higher-temperature refrigerant, so that the thermal management system has enough higher-temperature refrigerant to heat the battery pack.

[0054] The second aspect of the present disclosure provides a battery assembly, including the above-mentioned thermal management system. Through the above-mentioned thermal management system, each battery pack in the battery assembly can be cooled and heated, so that the temperature of each battery pack is controlled 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 above-mentioned battery assembly includes all the beneficial effects of the above-mentioned thermal management system, which will not be elaborated here.

[0055] The third aspect of the present disclosure provides an electrical device, including the above-mentioned battery assembly. It should be noted that the electrical device can be a new energy vehicle containing the battery assembly. Through the above-mentioned battery assembly, the battery packs in the battery assembly can be evenly cooled or heated, so that the temperatures of the battery packs tend to be the same, thereby ensuring the service performance of the battery packs. Of course, the above-mentioned electrical device being a new energy vehicle containing the battery assembly is illustrative. In other embodiments, the electrical device can also be in other forms. For example, the electrical device can also be an electrical device for a storage battery, etc.

[0056] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of 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 fall within the protection scope of the present disclosure.

[0057] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0058] In addition, any combination can be made between various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A thermal management system, characterized in that: include: A heat exchange unit, comprising at least two heat exchange pipelines, the heat exchange pipelines are arranged in parallel, a heat exchange branch is provided on the heat exchange pipeline, at least one of the heat exchange pipelines comprises at least two heat exchange branches, the heat exchange branches are arranged in parallel, and a heat exchanger is provided on each of the heat exchange branches; and The regulating unit includes a first regulating component, which is arranged in series with the parallel heat exchange branch, and the first regulating component is configured to be able to regulate the refrigerant pressure and / or flow rate in the heat exchange pipeline of the same path to adjust the heat exchange capacity of the heat exchange pipeline.

2. The thermal management system according to claim 1, characterized in that: The deviation between the heat exchange amounts in the heat exchange pipeline is not greater than 30%.

3. The thermal management system according to claim 1, characterized in that: The heat exchange capacities of the heat exchangers in at least two of the heat exchange branches are different.

4. The thermal management system according to claim 1, characterized in that: The heat exchange unit comprises a first heat exchange pipeline, a second heat exchange pipeline and a third heat exchange pipeline which are arranged in parallel. The first heat exchange pipeline includes a plurality of first heat exchange branches arranged in parallel, The second heat exchange pipeline includes a plurality of second heat exchange branches arranged in parallel, The first heat exchange pipeline and the second heat exchange pipeline are connected in parallel and then connected in parallel with the third heat exchange pipeline. The heat exchanger includes a first heat exchanger arranged in each of the first heat exchange branches and used for heat exchange of the first battery pack, a second heat exchanger arranged in the second heat exchange branch and used for heat exchange of the second battery pack, and a third heat exchanger arranged in the third heat exchange pipeline and used for heat exchange of the third battery pack, wherein the heat exchange capacity of the second heat exchanger is greater than that of the first heat exchanger, and the heat exchange capacity of the second heat exchanger is less than that of the third heat exchanger.

5. The thermal management system according to claim 4, characterized in that: The adjustment unit further includes a second adjustment component and a third adjustment component. The second regulating component is arranged in series with the parallel heat exchange pipeline, and the second regulating component is configured to cooperate with the first regulating component to regulate the refrigerant pressure and / or flow rate in the heat exchange pipeline that is different from the first regulating component, so as to adjust the heat exchange capacity of the heat exchange pipeline; The third regulating component is disposed in each of the heat exchange branches, and the third regulating component is configured to be able to regulate the refrigerant pressure and / or flow rate in each of the heat exchange branches to adjust the heat exchange amount of the heat exchange branch.

6. The thermal management system according to claim 5, characterized in that: The first regulating component includes a first electronic expansion valve and a first pressure and temperature sensor, and the first electronic expansion valve and the first pressure and temperature sensor are located at the refrigerant outlet after the first heat exchange branches are connected in parallel; The second regulating component includes a second electronic expansion valve, a second pressure and temperature sensor, a third electronic expansion valve and a third pressure and temperature sensor, the second electronic expansion valve and the second pressure and temperature sensor are located at the refrigerant outlet after the first heat exchange pipeline and the second heat exchange pipeline are connected in parallel, and the third electronic expansion valve and the third pressure and temperature sensor are located at the refrigerant outlet after the first heat exchange pipeline and the second heat exchange pipeline are connected in parallel and then connected in parallel with the third heat exchange pipeline; The third adjustment component includes multiple fourth electronic expansion valves, multiple first temperature sensors and multiple second temperature sensors, wherein the multiple fourth electronic expansion valves and the first temperature sensors are respectively located at the refrigerant inlets of the first heat exchange branch, the second heat exchange branch and the third heat exchange pipeline, and the multiple second temperature sensors are respectively located at the refrigerant outlets of the first heat exchange branch, the second heat exchange branch and the third heat exchange pipeline.

7. The thermal management system according to claim 6, characterized in that: The thermal management system further includes a fourth heat exchanger, a gas-liquid separator, a liquid storage device and a compressor. The refrigerant outlet of the fourth heat exchanger is provided with a fifth electronic expansion valve and is connected to the refrigerant inlet of the liquid storage device. The refrigerant inlet of the fourth heat exchanger is selectively connected to the refrigerant outlet of the compressor or to the refrigerant inlet of the gas-liquid separator in an on-off manner. The refrigerant inlet of the compressor is connected to the refrigerant outlet of the gas-liquid separator, and the refrigerant outlet of the compressor is also connected to the third electronic expansion valve; The refrigerant inlet of the gas-liquid separator is also connected to the third electronic expansion valve; The refrigerant outlet of the liquid storage device is communicated with the refrigerant inlet of each of the heat exchange pipelines.

8. The thermal management system according to claim 7, characterized in that: The thermal management system also includes a fifth heat exchanger, a sixth electronic expansion valve is provided at the refrigerant inlet of the fifth heat exchanger and is connected to the refrigerant inlet of the liquid storage device, and a refrigerant outlet of the fifth heat exchanger is connected to the refrigerant inlet of the gas-liquid separator.

9. The thermal management system according to claim 7, characterized in that: The thermal management system further includes a first switching component in communication with the third electronic expansion valve, wherein the first switching component is configured to selectively connect the third electronic expansion valve to a refrigerant outlet of the compressor or a refrigerant inlet of the gas-liquid separator.

10. The thermal management system according to claim 7, characterized in that: The thermal management system also includes a second switching component connected to the refrigerant inlet of the fourth heat exchanger, and the second switching component is configured to selectively connect the refrigerant inlet of the fourth heat exchanger to the refrigerant inlet of the gas-liquid separator or the refrigerant outlet of the compressor.

11. The thermal management system according to claim 9, characterized in that: The first switching component includes two first control valves arranged in parallel, one of which is used to control the connection and disconnection of the refrigerant outlet of the compressor and the third electronic expansion valve, and the other first control valve is used to control the connection and disconnection of the refrigerant outlet after the gas-liquid separator is connected in parallel with the second heat exchange pipeline and the third heat exchange pipeline.

12. The thermal management system according to claim 11, characterized in that: The first switching component includes a seventh electronic expansion valve, which is arranged in parallel with the third electronic expansion valve. The third electronic expansion valve is used to control the connection and disconnection of the refrigerant outlet after the second heat exchange pipeline and the third heat exchange pipeline are connected in parallel and the refrigerant inlet of the gas-liquid separator. The seventh electronic expansion valve is used to control the connection and disconnection of the refrigerant outlet after the second heat exchange pipeline and the third heat exchange pipeline are connected in parallel and the refrigerant outlet of the compressor.

13. The thermal management system according to claim 10, characterized in that: The second switching component includes two second control valves arranged in parallel, one of which is used to control the connection and disconnection of the refrigerant outlet of the compressor and the refrigerant inlet of the fourth heat exchanger, and the other second control valve is used to control the connection and disconnection of the refrigerant inlet of the gas-liquid separator and the refrigerant inlet of the fourth heat exchanger.

14. The thermal management system according to any one of claims 7 to 13, characterized in that: The thermal management system further comprises an evaporator and a condenser. The refrigerant inlet of the evaporator is provided with an eighth electronic expansion valve and is connected to the refrigerant outlet of the liquid storage device in an on-off manner. The refrigerant outlet of the evaporator is connected to the refrigerant inlet of the gas-liquid separator. The refrigerant inlet of the condenser is provided with a ninth electronic expansion valve and is connected to the refrigerant outlet of the liquid storage device in an on-off manner. The refrigerant outlet of the condenser is connected to the refrigerant outlet of the compressor.

15. A battery assembly, characterized in that: A thermal management system comprising any one of claims 1-14.

16. An electrical equipment, characterized in that: Includes the battery assembly as described in claim 15.

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