Thermal management system, energy storage container, and control method of thermal management system

Abstract

The present application provides a thermal management system, an energy storage container and a control method for the thermal management system. In the thermal management system, the third heat exchanger is combined with the setting of the air-supply throttling device. In the cooling mode, it can increase the subcooling of the refrigerant and improve the cooling efficiency of the system. In the heating mode, it can increase the superheat of the refrigerant and improve the heating efficiency of the system. At the same time, due to the special design of the refrigerant circuit, only through the cooperation of the two one-way valves of the first one-way valve and the second one-way valve, the refrigerant can be countercurrently exchanged in the third heat exchanger regardless of whether it is in the cooling mode or the heating mode, further improving the heat exchange efficiency and temperature uniformity adjustment ability of the thermal management system, and solving the problem of forward heat exchange of the refrigerant in the economizer in one of the heating and cooling modes of the thermal management system applied to the energy storage battery in the prior art.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a thermal management system, an energy storage container, and a control method for the thermal management system. Background Art

[0002] In the field of energy storage batteries, such as photovoltaic system energy storage batteries, the energy storage batteries of photovoltaic systems have high temperature requirements and require a thermal management system to ensure that the energy storage batteries are within a certain temperature range. The existing technology continuously exchanges heat with a medium such as water at a certain temperature to control the energy storage batteries at an appropriate temperature. In the process of implementing this application, the applicant found that there are at least the following technical problems in the existing technology: In the existing thermal management system, due to the design of the pipeline network, in one of the heating mode and the cooling mode, the refrigerant will flow in the same direction in the two channels of the economizer in one of the modes, that is, downstream, which results in poor heat exchange efficiency and poor heat exchange effect in this mode. Summary of the Invention

[0003] In view of this, the present application provides a thermal management system, an energy storage container and a control method for the thermal management system to solve the problem of downstream heat exchange of the refrigerant in the economizer of the thermal management system applied to the energy storage battery in one of the heating and cooling modes in the prior art.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A thermal management system for exchanging heat for a plurality of batteries in an energy storage system, comprising a refrigerant circuit including a compressor, a first heat exchanger, a second heat exchanger, and a third heat exchanger connected to each other;

[0006] The third heat exchanger includes a first heat exchange portion and a second heat exchange portion for exchanging heat with the first heat exchange portion, wherein the outlet side of the second heat exchange portion is connected to the air supply port of the compressor;

[0007] The first heat exchanger is connected to the inlet side of the first heat exchange portion via a first branch, and a first one-way valve is provided in the first branch;

[0008] The outlet side of the first heat exchange portion is connected to the second heat exchanger via a second branch, and a refrigeration throttling element is provided in the second branch;

[0009] The second branch is connected to the inlet side of the second heat exchange portion through a third branch, and an air supply throttling element is provided in the third branch;

[0010] The second branch is connected to the first branch via a fourth branch, and a heating throttling element is provided in the fourth branch;

[0011] The second branch is connected to the first branch through a fifth branch. A second one-way valve is provided in the fifth branch, and the flow direction of the refrigerant in the second heat exchange part is opposite to the flow direction of the refrigerant in the first heat exchange part.

[0012] Optionally, both the first one-way valve and the second one-way valve are mechanical one-way valves.

[0013] Optionally, along the direction from the first heat exchanger to the first heat exchange portion, the first branch includes a first branch section, a first branch section, and a first branch section.

[0014] Along the direction from the first heat exchange portion to the second heat exchanger, the second branch includes a second branch section 1, a second branch section 2, and a second branch section 3;

[0015] The first one-way valve is provided in the second section of the first branch, the refrigeration throttling device is provided in the second section of the second branch, the first section of the second branch is connected to the inlet side of the second heat exchange part through the third branch, the first section of the second branch is connected to the first section of the first branch through the fourth branch, and the third section of the second branch is connected to the third section of the first branch through the fifth branch.

[0016] Optionally, the first section of the second branch, the second section of the second branch, the third branch and the fourth branch are connected via a multi-way connector.

[0017] Optionally, a filter is provided in a section of the second branch.

[0018] Optionally, a liquid reservoir is provided in the third section of the first branch, and a refrigerant filling structure is provided between the liquid reservoir and the first heat exchange part.

[0019] Optionally, a medium-pressure pressure sensor and a medium-pressure temperature sensor are provided between the second heat exchange part and the compressor.

[0020] Optionally, a multi-way reversing valve is provided in the refrigerant circuit, the multi-way reversing valve including a first interface connected to the exhaust side of the compressor, a second interface connected to the first heat exchanger, a third interface connected to the intake side of the compressor, and a fourth interface connected to the second heat exchanger;

[0021] In cooling mode, the first interface is connected to the second interface, and the third interface is connected to the fourth interface;

[0022] In the heating mode, the first interface is connected to the fourth interface, and the third interface is connected to the second interface.

[0023] Optionally, both the inlet side and the outlet side of the second heat exchanger are provided with stop valves.

[0024] An energy storage container comprises the thermal management system described in any one of the above items.

[0025] A control method for a thermal management system comprises the following steps:

[0026] Compare the ambient temperature with the preset temperature threshold;

[0027] If the ambient temperature is greater than the preset temperature threshold, the system enters cooling mode: the first and second interfaces of the multi-way reversing valve are connected, and the third and fourth interfaces are connected, the cooling throttle and the air supply throttle are opened, the heating throttle is closed, and the compressor is started;

[0028] If the ambient temperature is lower than the preset temperature threshold, the heating mode is entered: the first interface and the fourth interface of the multi-way reversing valve are controlled to be connected and the second interface and the third interface are controlled to be connected, the heating throttle and the air supply throttle are controlled to be opened, the cooling throttle is controlled to be closed, and the compressor is controlled to start.

[0029] The thermal management system provided by the present application is used for exchanging heat for an energy storage battery, and includes a refrigerant circuit, the refrigerant circuit has a cooling mode and a heating mode, the refrigerant circuit includes a compressor, a first heat exchanger, a second heat exchanger and a third heat exchanger connected to each other; the third heat exchanger includes a first heat exchange part and a second heat exchange part that exchanges heat with the first heat exchange part, the outlet side of the second heat exchange part is connected to the air supply port of the compressor; the first heat exchanger is connected to the inlet side of the first heat exchange part through a first branch, and a first one-way valve is provided in the first branch; the first heat exchange part is connected to the inlet side of the first heat exchange part through a first branch, and a first one-way valve is provided in the first branch; the first heat exchange part is connected to the inlet side of the first heat exchange part through a first branch, and a first one-way valve is provided in the first branch. The outlet side is connected to the second heat exchanger through the second branch, and a refrigeration throttling device is provided in the second branch; the second branch is connected to the inlet side of the second heat exchange part through the third branch, and an air supply throttling device is provided in the third branch; the second branch is connected to the first branch through the fourth branch, and a heating throttling device is provided in the fourth branch; the second branch is connected to the first branch through the fifth branch, and a second one-way valve is provided in the fifth branch, so that in the cooling mode and the heating mode, the flow direction of the refrigerant in the second heat exchange part is opposite to the flow direction of the refrigerant in the first heat exchange part. With such a setting, the refrigerant circuit is utilized to directly exchange heat with the energy storage battery only through the refrigerant. In this application, only the refrigerant is used as the heat exchange medium, reducing the setting of heat exchange media such as water. Not only is the heat exchange efficiency high, but also because there is no intermediate heat exchange medium, the temperature of the energy storage battery is directly regulated by controlling and adjusting the refrigerant circuit, and the temperature uniformity adjustment capability is strong. In addition, the third heat exchanger is combined with the setting of the air supply throttling device. In the cooling mode, it can increase the supercooling of the refrigerant and improve the cooling efficiency of the system. In the heating mode, it can increase the superheat of the refrigerant and improve the heating efficiency of the system. At the same time, due to the special design of the refrigerant circuit, only the cooperation of the two one-way valves of the first one-way valve and the second one-way valve can achieve countercurrent heat exchange of the refrigerant in the third heat exchanger regardless of whether it is in the cooling mode or the heating mode, further improving the heat exchange efficiency and temperature uniformity adjustment capability of the thermal management system, and solving the problem of forward heat exchange of the refrigerant in the economizer of the thermal management system applied to the energy storage battery in one of the heating and cooling modes in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0031] Figure 1 A schematic diagram of a thermal management system provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the refrigerant flow direction in the cooling mode provided in an embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of the refrigerant flow in the heating mode provided in an embodiment of the present application.

[0034] exist Figure 1-Figure 3 middle:

[0035] 1. Compressor; 2. Third heat exchanger; 3. Second heat exchanger; 4. First heat exchanger; 5. First branch section 1; 6. First branch section 2; 7. First branch section 3; 8. First check valve; 9. Second branch section 1; 10. Second branch section 2; 11. Second branch section 3; 12. Refrigeration throttle; 13. Third branch; 14. Air supply throttle; 15. Fourth branch; 16. Heating throttle; 17. Fifth branch; 18. Second check valve; 19. Filter; 20. Medium pressure sensor; 21. Medium pressure temperature sensor; 22. Liquid reservoir; 23. Refrigerant filling structure; 24. Multi-way reversing valve; 25. Stop valve; 26. Low pressure sensor; 27. Return air temperature sensor; 28. High pressure sensor; 29. ​​Exhaust air temperature sensor; 30. Gas-liquid separator;

[0036] 241, first interface; 242, second interface; 243, third interface; 244, fourth interface. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] like Figure 1-Figure 3As shown, an embodiment of the present application provides a thermal management system for exchanging heat between multiple batteries in an energy storage system, such as exchanging heat between energy storage batteries in a photovoltaic system. The thermal management system includes a refrigerant circuit, and the refrigerant circuit has a cooling mode and a heating mode. The refrigerant circuit includes a connected compressor 1, a third heat exchanger 2, a second heat exchanger 3 for exchanging heat with the energy storage battery, and a first heat exchanger 4 for exchanging heat with the external environment. The second heat exchanger 3 can also be called a cold plate; the third heat exchanger 2 includes a first heat exchange part and a second heat exchange part for exchanging heat with the first heat exchange part, and the outlet side of the second heat exchange part of the third heat exchanger 2 is connected to the air supply port of the compressor 1; the first heat exchanger 4 is connected to the inlet side of the first heat exchange part of the third heat exchanger 2 through a first branch, and the first branch is provided with a first one-way valve 8 that only allows refrigerant to flow from the first heat exchanger 4 to the first heat exchange part of the third heat exchanger 2; the outlet side of the first heat exchange part of the third heat exchanger 2 It is connected to the second heat exchanger 3 through a second branch, and the second branch is provided with a refrigeration throttling device 12 which is opened only in the cooling mode, that is, the refrigeration throttling device 12 is arranged on the front side where the refrigerant enters the second heat exchanger 3; the second branch is connected to the inlet side of the second heat exchange part of the third heat exchanger 2 through a third branch 13, and the third branch 13 is provided with an air supply throttling device 14; the second branch is connected to the first branch through a fourth branch 15, and the fourth branch 15 is provided with a heating throttling device 16 which is opened only in the heating mode, and the heating throttling device 16 is arranged on the front side where the refrigerant enters the first heat exchanger 4; the second branch is connected to the first branch through a fifth branch 17, and the fifth branch 17 is provided with a second one-way valve 18 which only allows the refrigerant to flow from the second heat exchanger 3 to the first heat exchange part of the third heat exchanger 2, so that in the cooling mode and the heating mode, the flow direction of the refrigerant in the second heat exchange part of the third heat exchanger 2 is opposite to the flow direction of the refrigerant in the first heat exchange part.

[0039] With such a setting, the refrigerant circuit is utilized to directly exchange heat with the energy storage battery only through the refrigerant. In this application, only the refrigerant is used as the heat exchange medium, reducing the setting of heat exchange media such as water. Not only is the heat exchange efficiency high, but also because there is no intermediate heat exchange medium, the temperature of the energy storage battery is directly regulated by controlling and adjusting the refrigerant circuit, and the temperature uniformity adjustment capability is strong; in addition, the third heat exchanger 2 is combined with the setting of the air supply throttling member 14. In the cooling mode, it can increase the supercooling of the refrigerant and improve the cooling efficiency of the system; in the heating mode, it can increase the superheat of the refrigerant and improve the heating efficiency of the system; at the same time, due to the special design of the refrigerant circuit, only through the cooperation of the two one-way valves, the first one-way valve 8 and the second one-way valve 18, it can be achieved that the refrigerant is always in countercurrent heat exchange in the third heat exchanger 2 regardless of whether it is in the cooling mode or the heating mode, further improving the heat exchange efficiency and temperature uniformity adjustment capability of the thermal management system, and solving the problem of the refrigerant in the economizer of the thermal management system applied to the energy storage battery in one of the heating and cooling modes in the prior art.

[0040] Moreover, in the prior art, four one-way valves are used to realize countercurrent heat exchange of the refrigerant in the third heat exchanger 2 regardless of whether it is in cooling mode or heating mode. In comparison, the thermal management system provided in the present application can achieve the same technical effect by relying on two one-way valves. In the later operation and maintenance, the maintenance cost is reduced, the operation and maintenance are simpler, and the reliability is higher.

[0041] It should be noted that the refrigeration throttling element 12 can be a refrigeration expansion valve or a refrigeration throttling valve, the heating throttling element 16 can be a heating expansion valve or a heating throttling valve, and the air supply throttling element 14 can be an air supply expansion valve or an air supply throttling valve.

[0042] In some optional embodiments, the first one-way valve 8 and the second one-way valve 18 are both mechanical one-way valves, such as spring-loaded one-way valves, swing-type one-way valves, lift-type one-way valves, ball-type one-way valves, diaphragm-type one-way valves, and the like.

[0043] With this arrangement, the mechanical one-way valve has a simple structure, no moving parts, high reliability, and fast response speed. It is also easy to install in applications, has good durability, high adaptability to the installation environment, and high safety. At the same time, it is also conducive to further improving the simplicity of the debugging and operation and maintenance of the thermal management system.

[0044] Of course, in addition to the above-mentioned method, the first one-way valve 8 and the second one-way valve 18 are both configured as electromagnetic one-way valves; or as needed, a mechanical one-way valve and an electromagnetic one-way valve can be used in combination, which is also feasible.

[0045] In some more specific embodiments, along the direction from the first heat exchanger 4 to the first heat exchange portion of the third heat exchanger 2, the first branch includes a first branch section 1 5, a first branch section 2 6, and a first branch section 3 7, and the first branch section 2 6 is provided with a first one-way valve 8 that only allows the refrigerant to flow from the first heat exchanger 4 to the first heat exchange portion of the third heat exchanger 2; the outlet side of the first heat exchange portion of the third heat exchanger 2 is connected to the second heat exchanger 3 through the second branch, and along the direction from the first heat exchange portion of the third heat exchanger 2 to the second heat exchanger 3, the second branch includes a second branch section 1 9, a second branch section 2 10, and a second branch section 3 11, and the first branch section 1 The second branch section 10 is provided with a refrigeration throttling device 12 which is opened only in the cooling mode, that is, the refrigeration throttling device 12 is arranged on the front side where the refrigerant enters the second heat exchanger 3; the second branch section 9 is connected to the inlet side of the second heat exchange part through the third branch 13, and the third branch 13 is provided with an air supply throttling device 14; the second branch section 9 is connected to the first branch section 5 through the fourth branch 15, and the fourth branch 15 is provided with a heating throttling device 16 which is opened only in the heating mode, and the heating throttling device 16 is arranged on the front side where the refrigerant enters the first heat exchanger 4; the second branch section 11 is connected to the first branch section 7 through the fifth branch 17.

[0046] In this way, at the end of the second branch section 9, three branches are formed, namely the second branch section 2 10, the third branch 13 and the fourth branch 15. The third branch 13 is connected to the second branch section 19 regardless of whether it is in cooling mode or heating mode; after the refrigerant passes through the first heat exchange part of the third heat exchanger 2, a part of the refrigerant enters the second heat exchange part after passing through the air supplementary throttling device 14, so that the refrigerant in the second heat exchange part exchanges heat with the refrigerant in the first heat exchange part under different modes; in the cooling mode, the cooling throttling device 12 is opened, the second branch section 2 10 is open, and with the guidance of the first one-way valve 8, the refrigerant circuit forms a cooling mode cycle; in the heating mode, the heating throttling device 16 is opened, the fourth branch 15 is open, and with the guidance of the second one-way valve 18, the refrigerant circuit forms a heating mode cycle.

[0047] In some optional embodiments, the second branch section 1 9, the second branch section 2 10, the third branch 13, and the fourth branch 15 are connected by a multi-way connector. For example, the four pipelines are connected by a four-way connector to achieve the connection between one main line and three branches, which is conducive to convenient system assembly.

[0048] Of course, in addition to the above-mentioned method, it is also feasible to connect the second branch section 1 9 , the second branch section 2 10 , the third branch 13 and the fourth branch 15 through two three-way joints.

[0049] In addition, the second section 6 of the first branch, the third section 7 of the first branch and the fifth branch 17 are connected by a three-way joint.

[0050] In some specific embodiments, a filter 19 is provided within the first section of the second branch 9 to remove impurities from the refrigerant to ensure proper operation of the system. This ensures that the refrigerant passes through the filter 19 before entering the second section of the second branch 10, the third branch 13, and the fourth branch 15, ensuring the proper operation of the air supply throttle 14, the cooling throttle 12, and the heating throttle 16, resulting in increased safety.

[0051] In some other specific embodiments, a medium-pressure pressure sensor 20 and a medium-pressure temperature sensor 21 are provided between the first heat exchange section and the compressor 1. With this arrangement, the medium-pressure pressure sensor 20 and the medium-pressure temperature sensor 21 are used to respectively detect the pressure and temperature of the gaseous refrigerant flowing from the second heat exchange section to the air supply port of the compressor 1. In cooling mode and heating mode, the refrigerant flowing to the air supply port of the compressor 1 has different required pressure ranges and temperature ranges. Through feedback from the medium-pressure pressure sensor 20 and the medium-pressure temperature sensor 21, the opening of the air supply throttle 14 can be controllably changed. In cooling mode and heating mode, the air supply port of the compressor 1 can obtain the optimal air supply pressure and air supply temperature.

[0052] In other specific embodiments, a liquid reservoir 22 is provided in the third section 7 of the first branch, and a refrigerant filling structure 23 is provided between the liquid reservoir 22 and the first heat exchange section. The liquid reservoir 22 is responsible for storing a certain amount of liquid refrigerant and adjusting the refrigerant circulation volume as needed. Furthermore, when the system is suspended or undergoing maintenance, the liquid reservoir 22 can contain the liquid refrigerant within the system to prevent spillage and contamination or waste. The refrigerant filling structure 23 can be a conventional fluorine injection nozzle to facilitate refrigerant addition to the refrigerant circuit.

[0053] In other specific embodiments, a gas-liquid separator 30 is provided on the air inlet side of the compressor 1, and a refrigerant filling structure 23 is provided between the gas-liquid separator 30 and the compressor 1. This allows the gas-liquid separator 30 to absorb moisture and store liquid refrigerant before the refrigerant enters the inlet of the compressor 1, ensuring that only gaseous refrigerant is drawn into the inlet of the compressor 1, thus preventing liquid refrigerant from entering the compressor 1 and causing liquid hammer. The refrigerant filling structure 23 can be a common fluorine injection nozzle to facilitate the addition of refrigerant to the refrigerant circuit.

[0054] At the same time, before the refrigerant enters the gas-liquid separator 30, a low-pressure pressure sensor 26 and a return air temperature sensor 27 are provided. The low-pressure pressure sensor 26 and the return air temperature sensor 27 are respectively used to detect the pressure and temperature of the refrigerant entering the compressor 1, and to provide real-time feedback to the control system for adjustment. Through the adjustment of the control system, the pressure and temperature of the refrigerant entering the compressor 1 are maintained in the optimal range.

[0055] At the same time, a high-pressure pressure sensor 28 and an exhaust temperature sensor 29 are provided on the exhaust side of the compressor 1. The high-pressure pressure sensor 28 and the exhaust temperature sensor 29 are used to monitor the exhaust pressure and temperature of the compressor 1, and the system is adjusted according to the feedback of the exhaust pressure and temperature so that the discharged high-temperature and high-pressure gaseous refrigerant can be maintained at the optimal pressure and temperature.

[0056] In other specific embodiments, a multi-way reversing valve 24 is provided in the refrigerant circuit. The multi-way reversing valve 24 includes a first interface 241 connected to the exhaust side of the compressor 1, a second interface 242 connected to the first heat exchanger 4, a third interface 243 connected to the intake side of the compressor 1, and a fourth interface 244 connected to the second heat exchanger 3. In cooling mode, the first interface 241 and the second interface 242 are connected, and the third interface 243 and the fourth interface 244 are connected. In heating mode, the first interface 241 and the fourth interface 244 are connected, and the third interface 243 and the second interface 242 are connected, so that the refrigerant circuit switches between cooling mode and heating mode. The multi-way reversing valve 24 can be a four-way reversing valve.

[0057] In this configuration, the multi-way reversing valve 24 is used to realize different flow directions of the refrigerant in the refrigerant circuit in the cooling mode and the heating mode. Specifically, in the cooling mode, the first interface 241 is connected to the second interface 242, and the third interface 243 is connected to the fourth interface 244, so that the high-temperature and high-pressure gaseous refrigerant discharged from the outlet of the compressor 1 needs to pass through the first interface 241 and the second interface 242 before reaching the first heat exchanger 4, and the low-temperature and low-pressure gaseous refrigerant discharged from the second heat exchanger 3 passes through the third interface 243 and the fourth interface 244 before reaching the inlet of the compressor 1, completing a cooling cycle; in the heating mode, the first interface 241 is connected to the fourth interface 244, and the second interface 242 is connected to the third interface 243, so that the high-temperature and high-pressure gaseous refrigerant discharged from the outlet of the compressor 1 needs to pass through the first interface 241 and the fourth interface 244 before reaching the second heat exchanger 3, and the low-temperature and low-pressure refrigerant discharged from the first heat exchanger 4 passes through the second interface 242 and the third interface 243 before reaching the inlet of the compressor 1, completing a heating cycle. A multi-way reversing valve 24 is provided to change the flow direction of the refrigerant, which has a simple structure and is easy to operate.

[0058] In some other optional embodiments, shut-off valves 25 are provided on both the inlet and outlet sides of the second heat exchanger 3. With this arrangement, the other structures of the thermal management system, excluding the second heat exchanger 3, are integrated to form a unit module. The presence of the shut-off valves 25 facilitates disconnection of the refrigerant circulation between the unit module and the second heat exchanger 3, facilitating subsequent maintenance and repair work.

[0059] Based on the above-described thermal management system, embodiments of the present application further provide an energy storage container, which belongs to the field of photovoltaic system energy storage. The energy storage container includes multiple energy storage batteries and the above-described thermal management system. The thermal management system is used to directly cool and heat the energy storage batteries, ensuring their normal operation. Since the energy storage container includes the above-described thermal management system, the beneficial effects brought about by the thermal management system are described above and will not be further elaborated here.

[0060] Based on the above thermal management system, an embodiment of the present application further provides a control method for the thermal management system, comprising the following steps:

[0061] Compare the ambient temperature with the preset temperature threshold;

[0062] If the ambient temperature is greater than the preset temperature threshold, the cooling mode is entered: the first port 241 and the second port 242 of the multi-way reversing valve 24 are connected, and the third port 243 and the fourth port 244 are connected, the cooling throttle 12 and the air supply throttle 14 are opened, the heating throttle 16 is closed, and the compressor 1 is started;

[0063] If the ambient temperature is lower than the preset temperature threshold, the heating mode is entered: the first interface 241 and the fourth interface 244 of the multi-way reversing valve 24 are controlled to be connected and the second interface 242 and the third interface 243 are controlled to be connected, the heating throttle 16 and the air supply throttle 14 are controlled to be opened, the refrigeration throttle 12 is controlled to be closed, and the compressor 1 is controlled to start.

[0064] In this way, in the cooling mode, the refrigerant discharged from the compressor 1 flows through the first interface 241 of the multi-way reversing valve 24, the second interface 242 of the multi-way reversing valve 24, the first heat exchanger 4, the first one-way valve 8, and the first heat exchange part of the third heat exchanger 2 in sequence, and is divided into two at the four-way joint. A part of the refrigerant flows through the refrigeration throttling device 12, the second heat exchanger 3, the fourth interface 244 of the multi-way reversing valve 24, the third interface 243 of the multi-way reversing valve 24, and the gas-liquid separator 30 in sequence and then flows back to the air inlet of the compressor 1. The other part of the refrigerant flows through the air supply throttling device 14 and the second heat exchange part of the third heat exchanger 2 in sequence and then flows into the air supply port of the compressor 1.

[0065] In the heating mode, the refrigerant discharged from the compressor 1 flows through the first interface 241 of the multi-way reversing valve 24, the fourth interface 244 of the multi-way reversing valve 24, the second heat exchanger 3, the second one-way valve 18, and the first heat exchange part of the third heat exchanger 2 in sequence, and is divided into two at the four-way joint. Part of the refrigerant flows through the heating throttling device 16, the first heat exchanger 4, the second interface 242 of the multi-way reversing valve 24, the third interface 243 of the multi-way reversing valve 24, and the gas-liquid separator 30 in sequence, and then flows back to the air inlet of the compressor 1. The other part of the refrigerant flows through the air supply throttling device 14 and the second heat exchange part of the third heat exchanger 2 in sequence, and then flows into the air supply port of the compressor 1.

[0066] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0067] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0068] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0069] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0070] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly illustrate the technical solutions and cannot be used to limit the scope of protection of the present application.

[0071] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A thermal management system, characterized in that: Used for exchanging heat for a plurality of batteries in an energy storage system, comprising a refrigerant circuit, wherein the refrigerant circuit comprises a compressor (1), a first heat exchanger (4), a second heat exchanger (3), and a third heat exchanger (2) connected to each other; A multi-way reversing valve (24) is provided in the refrigerant circuit, and the multi-way reversing valve (24) includes a first interface (241) connected to the exhaust side of the compressor (1), a second interface (242) connected to the first heat exchanger (4), a third interface (243) connected to the intake side of the compressor (1), and a fourth interface (244) connected to the second heat exchanger (3); In the cooling mode, the first interface (241) and the second interface (242) are in communication, and the third interface (243) and the fourth interface (244) are in communication; In the heating mode, the first interface (241) and the fourth interface (244) are in communication, and the third interface (243) and the second interface (242) are in communication; The third heat exchanger (2) comprises a first heat exchange portion and a second heat exchange portion for exchanging heat with the first heat exchange portion, wherein the outlet side of the second heat exchange portion is connected to the air supply port of the compressor (1); The first heat exchanger (4) is connected to the inlet side of the first heat exchange portion via a first branch, and a first one-way valve (8) is provided in the first branch; The outlet side of the first heat exchange portion is connected to the second heat exchanger (3) via a second branch, and a refrigeration throttling element (12) is provided in the second branch; The second branch is connected to the inlet side of the second heat exchange portion via a third branch (13), and an air supply throttling element (14) is provided in the third branch (13); The second branch is connected to the first branch via a fourth branch (15), and a heating throttling element (16) is provided in the fourth branch (15); The second branch is connected to the first branch via a fifth branch (17). A second one-way valve (18) is provided in the fifth branch (17). The flow direction of the refrigerant in the second heat exchange portion is opposite to the flow direction of the refrigerant in the first heat exchange portion.

2. The thermal management system according to claim 1, characterized in that The first one-way valve (8) and the second one-way valve (18) are both mechanical one-way valves.

3. The thermal management system according to claim 1, wherein: Along the direction from the first heat exchanger (4) to the first heat exchange portion, the first branch includes a first branch section (5), a first branch section (6), and a first branch section (7); Along the direction from the first heat exchange portion to the second heat exchanger (3), the second branch includes a second branch section (9), a second branch section (10), and a second branch section (11); The first one-way valve (8) is provided in the second section (6) of the first branch, the refrigeration throttling element (12) is provided in the second section (10) of the second branch, the first section (9) of the second branch is connected to the inlet side of the second heat exchange part through the third branch (13), the first section (9) of the second branch is connected to the first section (5) of the first branch through the fourth branch (15), and the third section (11) of the second branch is connected to the third section (7) of the first branch through the fifth branch (17).

4. The thermal management system according to claim 3, characterized in that: The first section of the second branch (9), the second section of the second branch (10), the third branch (13) and the fourth branch (15) are connected via a multi-way connector.

5. The thermal management system according to claim 3, characterized in that: A filter (19) is provided in the second branch section (9).

6. The thermal management system according to claim 3, characterized in that: A liquid reservoir (22) is provided in the third section (7) of the first branch, and a refrigerant filling structure (23) is provided between the liquid reservoir (22) and the first heat exchange part.

7. The thermal management system according to claim 1, wherein: A medium-pressure sensor (20) and a medium-pressure temperature sensor (21) are provided between the second heat exchange portion and the compressor (1).

8. The thermal management system according to claim 1, wherein: Both the inlet side and the outlet side of the second heat exchanger (3) are provided with stop valves (25).

9. An energy storage container, characterized in that: The thermal management system comprises the thermal management system according to any one of claims 1 to 8.

10. A method for controlling a thermal management system, based on the thermal management system according to any one of claims 1 to 8, comprising the following steps: Compare the ambient temperature with the preset temperature threshold; If the ambient temperature is greater than a preset temperature threshold, the cooling mode is entered: the first interface (241) and the second interface (242) of the multi-way reversing valve (24) are controlled to be connected and the third interface (243) and the fourth interface (244) are controlled to be connected, the cooling throttle (12) and the air supply throttle (14) are controlled to be opened, the heating throttle (16) is controlled to be closed, and the compressor (1) is controlled to start; If the ambient temperature is lower than a preset temperature threshold, the heating mode is entered: the first interface (241) and the fourth interface (244) of the multi-way reversing valve (24) are controlled to be connected and the second interface (242) and the third interface (243) are controlled to be connected, the heating throttle element (16) and the air supply throttle element (14) are controlled to be opened, the cooling throttle element (12) is controlled to be closed, and the compressor (1) is controlled to start.

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