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

Abstract

According to the heat management system, the energy storage container and the control method of the heat management system, in the heat management system, the third heat exchanger is matched with the air supply throttling element, in the refrigeration mode, the supercooling degree of a refrigerant can be increased, the refrigeration efficiency of the system can be improved, in the heating mode, the superheat degree of the refrigerant can be increased, and the heating efficiency of the system can be improved; meanwhile, due to the special design of the refrigerant loop, countercurrent flow heat exchange of the refrigerant in the third heat exchanger can be achieved regardless of a refrigeration mode or a heating mode only through cooperation of the first one-way valve and the second one-way valve, the heat exchange efficiency and the temperature uniformity adjusting capacity of the heat management system are further improved, and the heat management system is suitable for large-scale popularization and application. The heat management system solves the problem that in the prior art, when a heat management system applied to an energy storage battery is in one of a heating mode and a refrigerating mode, a refrigerant in an economizer is subjected to down-flow heat exchange.

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 related technologies of energy storage batteries, such as the field of photovoltaic system energy storage batteries, the energy storage batteries of photovoltaic systems have high requirements on the temperature they are in, and a thermal management system is needed 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 with the energy storage battery to achieve control of the energy storage battery at an appropriate temperature. In the process of realizing this application, the applicant found that there are at least the following technical problems in the prior art: 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, so that the heat exchange efficiency is poor, resulting in 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 of 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, wherein the refrigerant circuit comprises 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 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 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 part through a first branch, and a first check valve is provided in the first branch;

[0008] The outlet side of the first heat exchange part is connected to the second heat exchanger through 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 part through a third branch, and an air supplement throttling element is provided in the third branch;

[0010] The second branch is connected to the first branch through 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. 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 part 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, and the multi-way reversing valve includes 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 communicated with the fourth interface, and the third interface is communicated with 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 cooling mode is entered: the first interface and the second interface of the multi-way reversing valve are controlled to be connected and the third interface and the fourth interface are controlled to be connected, the cooling throttle and the air supply throttle are controlled to be opened, the heating throttle is controlled to be closed, and the compressor is controlled to start;

[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 throttling device and the air supply throttling device are controlled to be opened, the refrigeration throttling device 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, and 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, and 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 non-return valve is provided in the first branch; the first heat exchange part The outlet side is connected to the second heat exchanger through a 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 a third branch, and an air supplement throttling device is provided in the third branch; the second branch is connected to the first branch through a fourth branch, and a heating throttling device is provided in the fourth branch; the second branch is connected to the first branch through a 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 configuration, the refrigerant circuit is utilized, and the energy storage battery is directly heat-exchanged only through the refrigerant. In the present application, only the refrigerant is used as the heat exchange medium, and the configuration of heat exchange mediums such as water is reduced. Not only is the heat exchange efficiency high, but also, since there is no intermediate heat exchange medium, the temperature of the energy storage battery is directly adjusted by controlling and adjusting the refrigerant circuit, and the temperature uniformity adjustment capability is strong. In addition, the third heat exchanger cooperates with the configuration of the air supply throttling member, and in the cooling mode, the supercooling of the refrigerant can be increased to improve the cooling efficiency of the system, and in the heating mode, the superheat of the refrigerant can be increased to 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, it can be achieved that the refrigerant is always in countercurrent heat exchange in the third heat exchanger regardless of the cooling mode or the heating mode, thereby further improving the heat exchange efficiency and the temperature uniformity adjustment capability of the thermal management system, and solving the problem of the refrigerant cocurrent heat exchange 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying 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 direction 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 non-return valve; 9. Second branch section 1; 10. Second branch section 2; 11. Second branch section 3; 12. Refrigeration throttling device; 13. Third branch; 14. Air supply throttling device; 15. Fourth branch; 16. Heating throttling device; 17. Fifth branch; 18. Second non-return valve; 19. Filter; 20. Medium pressure sensor; 21. Medium pressure temperature sensor; 22. Liquid storage device; 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 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 the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work 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 a first one-way valve 8 is provided in the first branch that only allows the 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 a refrigeration throttling device 12 which is opened only in the cooling mode is provided in the second branch, 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 an air supplement throttling device 14 is provided in the third branch 13; the second branch is connected to the first branch through a fourth branch 15, and a heating throttling device 16 which is opened only in the heating mode is provided in the fourth branch 15, 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 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 is provided in the fifth branch 17, 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 configuration, the refrigerant circuit is utilized, and the energy storage battery is directly heat-exchanged only through the refrigerant. In the present application, only the refrigerant is used as the heat exchange medium, and the configuration of heat exchange mediums such as water is reduced. Not only is the heat exchange efficiency high, but also, since there is no intermediate heat exchange medium, the temperature of the energy storage battery is directly adjusted by controlling and adjusting the refrigerant circuit, and the temperature uniformity adjustment capability is strong. In addition, the third heat exchanger 2 cooperates with the configuration of the air supply throttling member 14, and in the cooling mode, the supercooling of the refrigerant can be increased to improve the cooling efficiency of the system, and in the heating mode, the superheat of the refrigerant can be increased to 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, the first one-way valve 8 and the second one-way valve 18, can achieve that the refrigerant is always in countercurrent heat exchange in the third heat exchanger 2 regardless of the cooling mode or the heating mode, further improving the heat exchange efficiency and the temperature uniformity adjustment capability of the thermal management system, and solving the problem of the refrigerant cocurrent heat exchange 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 is 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 one-way valves, swing one-way valves, lifting one-way valves, ball one-way valves, diaphragm one-way valves, etc.

[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 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 required, a mechanical one-way valve and an electromagnetic one-way valve can be used together, 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 check 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 19 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 3 11 is connected to the first branch section 3 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 1 9 regardless of the cooling mode or the 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 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 a main line and three branches, which is conducive to the convenience of 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 connectors.

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

[0050] In some specific embodiments, a filter 19 is provided in the first section of the second branch 9, which is mainly used to remove impurities in the refrigerant to ensure the normal operation of the system. In this way, after the refrigerant passes through the filter 19, it enters the second section of the second branch 10, the third branch 13, and the fourth branch 15, ensuring the normal operation of the air supply throttle 14, the cooling throttle 12, and the heating throttle 16, which is safer.

[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 part and the compressor 1. In 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 part to the air supply port of the compressor 1. In the cooling mode and the heating mode, the refrigerant flowing to the air supply port of the compressor 1 has different required pressure ranges and temperature ranges. Through the feedback of the medium-pressure pressure sensor 20 and the medium-pressure temperature sensor 21, the opening of the air supply throttling element 14 can be controllably changed. In the cooling mode and the heating mode, the air supply port of the compressor 1 can obtain the best air supply pressure and air supply temperature.

[0052] In some other specific embodiments, a liquid reservoir 22 is provided in the first branch section 3 7, and a refrigerant filling structure 23 is provided between the liquid reservoir 22 and the first heat exchange part. The liquid reservoir 22 is responsible for storing a certain amount of liquid refrigerant and adjusting the circulation amount of the refrigerant as needed. When the system is suspended or overhauled, the liquid reservoir 22 can accommodate the liquid refrigerant in the system to prevent the liquid refrigerant from overflowing and causing pollution or waste. The refrigerant filling structure 23 can be a common fluorine injection nozzle to add refrigerant to the refrigerant circuit.

[0053] In some 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. In this way, before the refrigerant enters the inlet of the compressor 1, the gas-liquid separator 30 is used to absorb moisture and store the refrigerant liquid, so that the inlet of the compressor 1 only inhales gaseous refrigerant, avoiding liquid refrigerant entering the compressor 1 and causing liquid hammer. The refrigerant filling structure 23 can be a common fluorine injection nozzle to add 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 some other specific embodiments, 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 is connected to the second interface 242, and the third interface 243 is connected to the fourth interface 244; in the heating mode, the first interface 241 is connected to the fourth interface 244, and the third interface 243 is connected to the second interface 242, so that the refrigerant circuit switches between the cooling mode and the heating mode. The multi-way reversing valve 24 can be a four-way reversing valve.

[0057] In this way, 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 with the second interface 242, and the third interface 243 is connected with 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 to reach 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 to reach the inlet of the compressor 1, completing a refrigeration cycle; in the heating mode, the first interface 241 is connected with the fourth interface 244, and the second interface 242 is connected with 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 to reach 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 to reach 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, and has a simple structure and is easy to operate.

[0058] In some other optional embodiments, both the inlet and outlet sides of the second heat exchanger 3 are provided with a stop valve 25. In this way, the other structures of the thermal management system except the second heat exchanger 3 are integrated to form a unit module, and the existence of the stop valve 25 facilitates the disconnection of the refrigerant circulation between the unit module and the second heat exchanger 3, so as to facilitate the subsequent maintenance and repair work.

[0059] Based on the above thermal management system, the embodiment of the present application also provides 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 thermal management system, and the above thermal management system is used to directly cool and heat the energy storage batteries to ensure the normal operation of the energy storage batteries. Since the energy storage container has the above thermal management system, the beneficial effects brought by the thermal management system to the energy storage container can be found in the above content, which will not be repeated here.

[0060] Based on the above thermal management system, the embodiment of the present application also provides a control method of the thermal management system, including 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 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;

[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 throttling device 16 and the air supply throttling device 14 are controlled to be opened, the refrigeration throttling device 12 is controlled to be closed, and the compressor 1 is controlled to start.

[0064] In this way, in the refrigeration 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 non-return 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. One 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, and 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. One 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, and 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 are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0067] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[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. 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 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 explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0071] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, 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; The third heat exchanger (2) comprises a first heat exchange part and a second heat exchange part for exchanging heat with the first heat exchange part, wherein the outlet side of the second heat exchange part 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 via a first branch, and a first non-return valve (8) is provided in the first branch; The outlet side of the first heat exchange part 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 supplement 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), and a second one-way valve (18) is provided in the fifth branch (17), so that 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.

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, characterized in that: 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 non-return 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 (9) of the second branch, the second section (10) of the second branch, 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, characterized in that: A medium-pressure pressure sensor (20) and a medium-pressure temperature sensor (21) are provided between the second heat exchange part and the compressor (1).

8. The thermal management system according to claim 1, characterized in that: A multi-way reversing valve (24) is provided in the refrigerant circuit, and the multi-way reversing valve (24) comprises 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) is in communication with the second interface (242), and the third interface (243) is in communication with the fourth interface (244); In the heating mode, the first interface (241) is connected to the fourth interface (244), and the third interface (243) is connected to the second interface (242).

9. The thermal management system according to claim 1, characterized in that: The inlet side and the outlet side of the second heat exchanger (3) are both provided with stop valves (25).

10. An energy storage container, characterized in that: Comprising a thermal management system as claimed in any one of claims 1 to 9.

11. A control method for a thermal management system, based on the thermal management system according to any one of claims 1 to 9, 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 less 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 (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.

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