Thermal management system and energy storage container

Abstract

The utility model provides a heat management system and an energy storage container, and the heat management system is used for carrying out heat exchange on a plurality of battery packs in an energy storage system, and comprises a refrigerant main path, a refrigerant first branch path and a refrigerant second branch path; the refrigerant main path comprises a compressor, a first heat exchanger and a refrigeration throttling element which are connected with one another; the first refrigerant branch comprises a second heat exchanger, and the first refrigerant branch is connected with the main refrigerant path to form a refrigerant loop; the second refrigerant branch circuit is connected with the refrigerant main circuit and connected with the first refrigerant branch circuit in parallel, the second refrigerant branch circuit comprises a dehumidification heat exchanger and a dehumidification throttling element, and the dehumidification throttling element is arranged on the inlet side of the dehumidification heat exchanger and used for adjusting the refrigerant flow in the dehumidification heat exchanger; wherein the refrigerant loop at least has a refrigeration mode, and the dehumidification heat exchanger can dehumidify the working environment where the second heat exchanger is located. Through the arrangement, the problem that in the prior art, a heat management system applied to the energy storage battery cannot dehumidify the working environment of the energy storage battery is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a thermal management system and an energy storage container. BACKGROUND

[0002] In the related technology of energy storage batteries, such as the field of photovoltaic system energy storage batteries, the energy storage batteries of the photovoltaic system have high requirements on the temperature, and need to be controlled within a certain temperature range by a thermal management system. The existing technology controls the energy storage batteries at an appropriate temperature by continuously exchanging heat with the energy storage batteries with a medium at a certain temperature. In the process of implementing the present application, the applicant found that at least the following technical problems exist in the prior art: the existing thermal management system only controls the temperature of the energy storage batteries, but the humidity of the working environment of the energy storage batteries also needs to be controlled. The existing dehumidification method generally adds a dehumidifier, which increases the volume of the energy storage container. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a thermal management system and an energy storage container to solve the problem that the thermal management system applied to the energy storage batteries in the prior art cannot dehumidify the working environment of the energy storage batteries.

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

[0005] A thermal management system for heat exchange of multiple battery packs in an energy storage system, comprising:

[0006] A refrigerant main circuit comprising a compressor, a first heat exchanger and a refrigeration throttling device;

[0007] A refrigerant first branch circuit comprising a second heat exchanger, the refrigerant first branch circuit being connected to the refrigerant main circuit to form a refrigerant circuit;

[0008] A refrigerant second branch circuit connected to the refrigerant main circuit and arranged in parallel with the refrigerant first branch circuit, the refrigerant second branch circuit comprising a dehumidification heat exchanger and a dehumidification throttling device, the dehumidification throttling device being arranged at the inlet side of the dehumidification heat exchanger, and the dehumidification throttling device being used to adjust the flow of refrigerant in the dehumidification heat exchanger;

[0009] The refrigerant circuit has at least a refrigeration mode, and the dehumidification heat exchanger can dehumidify the working environment of the second heat exchanger.

[0010] Optionally, the refrigerant second branch circuit further comprises a first stop valve arranged at the inlet side of the dehumidification throttling device, and a second stop valve arranged at the outlet side of the dehumidification heat exchanger.

[0011] Optionally, a dehumidification fan is further included to drive air flow through the dehumidification heat exchanger.

[0012] Optionally, the dehumidification throttling member is a throttling valve or a capillary tube.

[0013] Optionally, the dehumidification throttling member is a throttling valve, and the refrigerant second branch further includes a dehumidification temperature sensor configured to detect a refrigerant temperature on an outlet side of the dehumidification heat exchanger, and the dehumidification temperature sensor is communicatively connected to the dehumidification throttling member.

[0014] Optionally, the refrigerant second branch is integrated in a battery cabinet in which the second heat exchanger is located.

[0015] Optionally, a first side of the refrigerant first branch and an inlet side of the refrigerant second branch are connected to a first dry connection pipe, and a second side of the refrigerant first branch and an outlet side of the refrigerant second branch are connected to a second dry connection pipe.

[0016] The first dry connection pipe is connected to the refrigerant main branch through a third stop valve, and the second dry connection pipe is connected to the refrigerant main branch through a fourth stop valve.

[0017] Optionally, the refrigerant main branch, the third stop valve, and the fourth stop valve are integrated in a unit box.

[0018] Optionally, the refrigerant main branch further includes a third heat exchanger, a heating throttling valve, and a multi-pass reversing valve.

[0019] The third heat exchanger has a first heat exchange portion and a second heat exchange portion in heat exchange with the first heat exchange portion, and the multi-pass reversing valve is in communication with an exhaust side of the compressor, the first heat exchanger, the second heat exchanger, and the first heat exchange portion, so as to switch the refrigerant circuit between a cooling mode and a heating mode.

[0020] The second heat exchange portion is in communication between the first heat exchanger and the second heat exchanger, and the first heat exchange portion is in communication between the multi-pass reversing valve and an intake side of the compressor.

[0021] An energy storage container includes a battery cabinet containing a plurality of battery packs, and a thermal management system according to any one of the above, and the second heat exchanger is provided in plurality and attached to each of the battery packs.

[0022] The heat management system provided by the application is used for heat exchange of a plurality of battery packs in an energy storage system, and comprises a refrigerant main circuit, a refrigerant first branch circuit and a refrigerant second branch circuit; the refrigerant main circuit comprises a compressor, a first heat exchanger and a refrigeration throttling device connected in sequence; the refrigerant first branch circuit comprises a second heat exchanger, and the refrigerant first branch circuit is connected with the refrigerant main circuit to form a refrigerant loop; the refrigerant second branch circuit is connected with the refrigerant main circuit and is arranged in parallel with the refrigerant first branch circuit, and the refrigerant second branch circuit comprises a dehumidification heat exchanger and a dehumidification throttling device; the dehumidification throttling device is arranged at an inlet side of the dehumidification heat exchanger, and is used for adjusting the refrigerant flow in the dehumidification heat exchanger; wherein the refrigerant loop has at least a refrigeration mode, and the dehumidification heat exchanger can dehumidify a working environment of the second heat exchanger. In this way, the refrigerant main circuit and the refrigerant first branch circuit are used to form a refrigerant loop, and the energy storage battery is directly exchanged with the refrigerant, and only the refrigerant is used as the heat exchange medium in the application, so that the setting of the water heat exchange medium is reduced, the heat exchange efficiency is high, and the temperature of the energy storage battery can be directly adjusted by controlling the refrigerant main circuit, so that the uniformity adjustment capacity is strong; in addition, in the refrigeration mode, the second heat exchanger cools the battery pack, and the refrigerant also flows in the dehumidification heat exchanger and evaporates to absorb heat, because the temperature is reduced to below the dew point temperature of water vapor, the water vapor in the air condenses into water droplets on the surface of the dehumidification heat exchanger, and dehumidification is realized, so that the humidity of the working environment of the battery pack is effectively reduced, the environmental conditions of the battery pack are optimized, and the condensation of water vapor on the surface of the second heat exchanger is avoided, so that the control precision of the heat management system for the uniformity of the battery pack is improved; in this way, the heat management system is used to simultaneously realize the synchronous temperature adjustment and dehumidification of the battery pack, the problem that the heat management system applied to the energy storage battery in the prior art cannot dehumidify the working environment of the energy storage battery is solved, other independent dehumidifiers are not required, and the equipment occupation space is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0024] Fig. 1 A schematic diagram of the heat management system provided by the embodiments of the present application;

[0025] Fig. 2 A refrigerant flow direction schematic diagram in the refrigeration mode provided by the embodiments of the present application;

[0026] Fig. 3 A refrigerant flow direction schematic diagram in the heating mode provided by the embodiments of the present application.

[0027] In Figs. 1-3 which:

[0028] 1, compressor; 2, first heat exchanger; 3, refrigeration throttling device; 4, second heat exchanger; 5, dehumidification heat exchanger; 6, dehumidification throttling device; 7, first stop valve; 8, second stop valve; 9, dehumidification fan; 10, dehumidification temperature sensor; 11, first dry connection pipe; 12, second dry connection pipe; 13, third stop valve; 14, fourth stop valve; 15, third heat exchanger; 16, heating throttling valve; 17, multi-way reversing valve; 18, flash evaporator; 19, electromagnetic valve; 20, gas-liquid separator; 21, filter; 22, first check valve; 23, second check valve;

[0029] 171, first interface; 172, second interface; 173, third interface; 174, fourth interface. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] As Figs. 1-3 shown, the present application provides a heat management system for heat exchange of multiple battery packs in an energy storage system, for example, heat exchange of energy storage batteries of a photovoltaic system, the heat management system comprising a refrigerant main circuit, a refrigerant first branch circuit and a refrigerant second branch circuit; the refrigerant main circuit comprises a compressor 1, a first heat exchanger 2 and a refrigeration throttling device 3 connected in series; the refrigerant first branch circuit comprises a second heat exchanger 4, and the refrigerant first branch circuit is connected with the refrigerant main circuit to form a refrigerant circuit; the refrigerant second branch circuit is connected with the refrigerant main circuit and is arranged in parallel with the refrigerant first branch circuit, along the flow direction of the refrigerant, the refrigeration throttling device 3 is located at the front side of the refrigerant second branch circuit, the refrigerant second branch circuit comprises a dehumidification heat exchanger 5 and a dehumidification throttling device 6, the dehumidification throttling device 6 is arranged at the inlet side of the dehumidification heat exchanger 5, and the dehumidification throttling device 6 is used to adjust the refrigerant flow in the dehumidification heat exchanger 5; wherein the refrigerant circuit at least has a refrigeration mode, and the dehumidification heat exchanger 5 can dehumidify the working environment where the second heat exchanger 4 is located.

[0032] In this way, the refrigerant main line and the refrigerant first branch line form a refrigerant circuit, and only the refrigerant directly exchanges heat with the energy storage battery. In the present application, only the refrigerant is used as the heat exchange medium, and the setting of water and other heat exchange media is reduced. The heat exchange efficiency is high, and the temperature of the energy storage battery can be directly adjusted by controlling the refrigerant main line, and the uniformity adjustment capability is strong. In addition, in the refrigeration mode, the second heat exchanger 4 cools the battery pack, and the refrigerant also flows through the dehumidification heat exchanger 5 and evaporates to absorb heat. Since the temperature is reduced to below the dew point temperature of water vapor, the water vapor in the air condenses into water droplets on the surface of the dehumidification heat exchanger 5, thereby achieving dehumidification. In this way, the humidity of the working environment of the battery pack is effectively reduced, which not only optimizes the environmental conditions of the battery pack, but also avoids the condensation of water vapor on the surface of the second heat exchanger 4, thereby facilitating the control accuracy of the thermal management system for the uniformity of the battery pack. In this way, the thermal management system simultaneously realizes the synchronous temperature adjustment and dehumidification of the working environment of the battery pack, solves the problem that the thermal management system applied to the energy storage battery in the prior art cannot dehumidify the working environment of the energy storage battery, and does not need to be equipped with other independent dehumidifiers, thereby reducing the equipment space.

[0033] In some specific embodiments, the dehumidification heat exchanger 5 can be but is not limited to a coil structure; the first heat exchanger 2 can be but is not limited to a coil structure, and generally, a fan for enhancing heat exchange is arranged around the first heat exchanger 2; and the second heat exchanger 4 can be but is not limited to a flat cold plate structure.

[0034] In some specific embodiments, the refrigerant main line further comprises a third heat exchanger 15, a heating throttling valve 16, and a multi-way reversing valve 17; the third heat exchanger 15 can also be referred to as a regenerator, and the third heat exchanger 15 has a first heat exchange part and a second heat exchange part which exchanges heat with the first heat exchange part. The first heat exchange part and the second heat exchange part can be specifically arranged as two adjacent heat exchange pipelines in the third heat exchanger 15. The multi-way reversing valve 17 is connected to the exhaust side of the compressor 1, the first heat exchanger 2, the second heat exchanger 4, and the first heat exchange part, so as to switch the refrigerant circuit between the refrigeration mode and the heating mode. The second heat exchange part is connected between the first heat exchanger 2 and the second heat exchanger 4, and the first heat exchange part is connected between the multi-way reversing valve 17 and the intake side of the compressor 1. In the working process, the third heat exchanger 15 exchanges heat with the refrigerant flowing into the intake port of the compressor 1 to increase the temperature, so that the refrigerant flowing into the first heat exchange part is wet vapor with a dryness less than 1, and the superheating process is all carried out in the first heat exchange part. Thus, only two-phase states of constant temperature evaporation are realized in the first heat exchanger 2 / second heat exchanger 4, which can ensure the uniformity of the multiple battery cells in the battery pack in the refrigeration mode, and can reduce the temperature difference between the evaporation temperature and the ambient temperature to increase the mass flow rate to increase the heating capacity in the heating mode.

[0035] It should be noted that the refrigeration throttling member 3 can be a refrigeration expansion valve or a refrigeration throttling valve, and the heating throttling member can be a heating expansion valve or a heating throttling valve 16.

[0036] In some specific embodiments, the multi-way reversing valve 17 has a first interface 171, a second interface 172, a third interface 173 and a fourth interface 174, for example, the multi-way reversing valve 17 is set as a four-way reversing valve. Different interfaces of the first interface 171, the second interface 172, the third interface 173 and the fourth interface 174 are in communication with each other in different modes to switch the working mode of the heat management system through the multi-way reversing valve 17. The first interface 171 is connected with the exhaust side of the compressor 1, the second interface 172 is connected with the first heat exchanger 2, the third interface 173 is connected with the intake side of the compressor 1 through the first heat exchange part, and the fourth interface 174 is connected with the second heat exchanger 4; in the cooling mode, the first interface 171 and the second interface 172 are in communication, and the third interface 173 and the fourth interface 174 are in communication; in the heating mode, the first interface 171 and the fourth interface 174 are in communication, and the third interface 173 and the second interface 172 are in communication, so as to switch the main refrigerant circuit between the cooling mode and the heating mode.

[0037] In this way, the multi-way reversing valve 17 is used to realize different flow directions of the refrigerant in the main refrigerant circuit in the cooling mode and the heating mode. Specifically, in the cooling mode, the compressor 1 compresses the low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant flows out of the outlet of the compressor 1 to the first heat exchanger 2, the normal-temperature liquid refrigerant condensed by the first heat exchanger 2 flows through the second heat exchange part first, and then flows through the second heat exchanger 4, the refrigerant evaporated by the second heat exchanger 4 flows through the first heat exchange part first, and then flows back to the intake of the compressor 1, since the temperature of the refrigerant in the second heat exchange part is higher than that of the refrigerant in the first heat exchange part, the third heat exchanger 15 can be used to exchange heat between the refrigerant flowing out of the first heat exchanger 2 and the refrigerant flowing out of the second heat exchanger 4, which is beneficial to ensure the uniform temperature of the multiple battery cells in the battery pack during cooling; in the heating mode, the compressor 1 compresses the low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant flows out of the outlet of the compressor 1 to the second heat exchanger 4, the normal-temperature liquid refrigerant condensed by the second heat exchanger 4 flows through the second heat exchange part first, and then flows through the first heat exchanger 2, the refrigerant evaporated by the first heat exchanger 2 flows through the first heat exchange part first, and then flows back to the intake of the compressor 1, since the temperature of the refrigerant in the second heat exchange part is higher than that of the refrigerant in the first heat exchange part, the third heat exchanger 15 can be used to exchange heat between the refrigerant flowing out of the second heat exchanger 4 and the refrigerant flowing out of the first heat exchanger 2, which can reduce the temperature difference between the evaporation temperature and the ambient temperature to increase the mass flow rate to increase the heating capacity. The multi-way reversing valve 17 is used to realize the change of the flow direction of the refrigerant, which has a simple structure and is convenient to operate.

[0038] In some preferred embodiments, the refrigerant second branch circuit further comprises a first stop valve 7 arranged on the inlet side of the dehumidification throttling member 6, and a second stop valve 8 arranged on the outlet side of the dehumidification heat exchanger 5.

[0039] In this way, the first stop valve 7 and the second stop valve 8 can play a role of shutting off, and in the heating mode, the dehumidification function of the dehumidification heat exchanger 5 is not needed temporarily, so the first stop valve 7 and the second stop valve 8 can be closed to prevent the refrigerant from passing through the refrigerant second branch.

[0040] In some preferred embodiments, the thermal management system provided by the present application further comprises a dehumidification fan 9, which is arranged close to the dehumidification heat exchanger 5 in the space near the dehumidification heat exchanger 5 to drive the air flow at the dehumidification heat exchanger 5. In this way, the air flow in the working environment of the battery pack is enhanced, and the dehumidification efficiency of the dehumidification heat exchanger 5 can be improved.

[0041] In some optional embodiments, the dehumidification throttling member 6 can be a throttle valve. The throttle valve can adjust the flow by changing the cross-sectional area of the fluid passing through the valve, and the throttle valve also has the advantage of easy maintenance.

[0042] Further, when the dehumidification throttling member 6 is a throttle valve, the refrigerant second branch further comprises a dehumidification temperature sensor 10 for detecting the temperature of the refrigerant on the outlet side of the dehumidification heat exchanger 5, and the dehumidification temperature sensor 10 and the dehumidification throttling member 6 are both in communication connection with the controller of the thermal management system. In this way, through the feedback of the dehumidification temperature sensor 10, the dehumidification throttling member 6 can controllably change the opening degree, thereby adjusting the refrigerant flow in the dehumidification heat exchanger 5 to make the dehumidification heat exchanger 5 reach a better dehumidification working condition.

[0043] In some optional embodiments, the dehumidification throttling member 6 can be a capillary tube. When the refrigerant passes through the capillary tube with a small diameter, the pressure drop of the flow can be changed, thereby controlling the refrigerant flow. The dehumidification throttling member 6 arranged as a capillary tube is conducive to reducing the cost.

[0044] Generally, the battery pack of the energy storage battery is integrated in a battery cabinet, that is, the second heat exchanger 4 and the dehumidification heat exchanger 5 are arranged in the battery cabinet. In some preferred embodiments, the refrigerant second branch is integrated in the battery cabinet where the second heat exchanger 4 is arranged, and in combination with the foregoing embodiments, the first stop valve 7, the dehumidification throttling member 6, the dehumidification temperature sensor 10, and the second stop valve 8 are also integrated in the battery cabinet. In this way, since the dehumidification heat exchanger 5 is arranged in the battery cabinet, the dehumidification can be better completed, and other elements in the refrigerant second branch are assembled and connected in the battery cabinet, which is conducive to the orderly and reasonable performance of the assembly work of the thermal management system.

[0045] In some other preferred embodiments, the first side of the first refrigerant branch and the inlet side of the second refrigerant branch are connected to the first dry connection pipe 11, and the second side of the first refrigerant branch and the outlet side of the second refrigerant branch are connected to the second dry connection pipe 12; the first dry connection pipe 11 is connected to the main refrigerant line through the third stop valve 13, and the second dry connection pipe 12 is connected to the main refrigerant line through the fourth stop valve 14. In this way, the main refrigerant line is integrated to form a unit module, and the presence of the third stop valve 13 and the fourth stop valve 14 facilitates the disconnection of the refrigerant circulation between the unit module and the second heat exchanger 4 and the dehumidification heat exchanger 5, so as to facilitate the later maintenance and repair work.

[0046] Further, the main refrigerant line, the third stop valve 13 and the fourth stop valve 14 are integrated in the unit box, and the unit box is located outside the battery cabinet. In this way, the entire thermal management system is arranged in two units, i.e., the unit box and the battery cabinet, which facilitates the orderly and reasonable assembly of the thermal management system and is also convenient for the later maintenance and repair work.

[0047] Moreover, the thermal management system provided by the present application, due to the special design of the main refrigerant line, only through the cooperation of the two one-way valves of the first one-way valve 22 and the second one-way valve 23, the refrigerant in the third heat exchanger 15 can realize counter-flow heat exchange in both cooling mode and heating mode, that is, the flow direction of the refrigerant in the first heat exchange part is opposite to that in the second heat exchange part, which improves the heat exchange efficiency of the third heat exchanger 15.

[0048] In addition, it should be noted that in order to ensure the good operation of the thermal management system, some other elements are also arranged in the main refrigerant line, for example, a flash tank 18 and an electromagnetic valve 19 are arranged on the gas supplement side of the compressor 1, a gas-liquid separator 20 is arranged on the gas inlet side of the compressor 1, and a filter 21 is arranged at an appropriate position in the main refrigerant line.

[0049] Based on the above-mentioned thermal management system, the present application further provides a storage energy container. The storage energy container belongs to the field of storage energy, and comprises a battery cabinet, a unit box and the above-mentioned thermal management system. The unit box is arranged outside the battery cabinet, the battery cabinet contains a plurality of battery packs, the second heat exchanger 4 is provided with a plurality of second heat exchangers and is attached to each battery pack, the refrigerant second branch is integrated in the battery cabinet, and the main refrigerant line is integrated in the unit box. The above-mentioned thermal management system is used for direct cooling heat exchange of the battery pack to ensure the normal operation of the battery pack. Since the storage energy container has the above-mentioned thermal management system, the beneficial effects of the storage energy container brought by the thermal management system are described above and will not be repeated here.

[0050] It should be noted that a water collecting structure for collecting condensed water can also be arranged in the battery cabinet, and the water collecting structure is arranged below the dehumidification heat exchanger 5 to realize the centralized collection and discharge of the condensed water.

[0051] The above describes the basic principles of the present application in combination with specific embodiments, but it should be noted that the advantages, benefits, effects and the like mentioned in the present application are only examples and are not limiting, and these advantages, benefits, effects and the like cannot be considered as necessary for each embodiment of the present application. In addition, the above specific details disclosed are only for the purpose of illustration and understanding, and are not limiting, and the above details do not limit the present application to be necessarily implemented with the above specific details.

[0052] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only illustrative examples and are not intended to require or imply the connection, arrangement, configuration as shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have" and the like are open-ended words, meaning "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0053] It should also be noted that in the devices, equipment and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions of the present application.

[0054] The above description of the disclosed aspects is provided so that any person skilled in the art can make or use the present application. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can 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 is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0055] It should be understood that the adjectives "first", "second", "third", "fourth", "fifth" and "sixth" used in the embodiments of the present application are only used for clearer description of the technical solutions, and cannot be used to limit the protection scope of the present application.

[0056] The above description has been given 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, changes, additions and sub-combinations thereof.

Claims

1. A thermal management system, characterized by, A heat exchange system for multiple battery packs in an energy storage system, comprising: a refrigerant main circuit including a compressor (1), a first heat exchanger (2), and a refrigeration throttling device (3); a refrigerant first branch circuit including a second heat exchanger (4), the refrigerant first branch circuit being connected to the refrigerant main circuit to form a refrigerant circuit; a refrigerant second branch circuit connected to the refrigerant main circuit and in parallel with the refrigerant first branch circuit, the refrigerant second branch circuit including a dehumidification heat exchanger (5) and a dehumidification throttling device (6), the dehumidification throttling device (6) being arranged at an inlet side of the dehumidification heat exchanger (5), and the dehumidification throttling device (6) being used to adjust the refrigerant flow in the dehumidification heat exchanger (5); wherein the refrigerant circuit has at least a refrigeration mode, and the dehumidification heat exchanger (5) can dehumidify the working environment of the second heat exchanger (4).

2. The thermal management system of claim 1, wherein, The refrigerant second branch circuit further includes a first stop valve (7) arranged at an inlet side of the dehumidification throttling device (6), and a second stop valve (8) arranged at an outlet side of the dehumidification heat exchanger (5).

3. The thermal management system of claim 1, wherein, A dehumidification fan (9) is further included to drive air flow at the dehumidification heat exchanger (5).

4. The thermal management system of claim 1, wherein, The dehumidification throttling device (6) is a throttling valve or a capillary tube.

5. The thermal management system of claim 1, wherein, The dehumidification throttling device (6) is a throttling valve, and the refrigerant second branch circuit further includes a dehumidification temperature sensor (10) used to detect the refrigerant temperature at the outlet side of the dehumidification heat exchanger (5), and the dehumidification temperature sensor (10) is in communication connection with the dehumidification throttling device (6).

6. The thermal management system of any of claims 1-5, wherein, The refrigerant second branch circuit is integrated in a battery cabinet where the second heat exchanger (4) is arranged.

7. The thermal management system of claim 1, wherein, A first dry connection pipe (11) is connected to a first side of the refrigerant first branch circuit and an inlet side of the refrigerant second branch circuit, and a second dry connection pipe (12) is connected to a second side of the refrigerant first branch circuit and an outlet side of the refrigerant second branch circuit; The first dry connection pipe (11) is connected to the refrigerant main circuit through a third stop valve (13), and the second dry connection pipe (12) is connected to the refrigerant main circuit through a fourth stop valve (14).

8. The thermal management system of claim 7, wherein, The refrigerant main circuit, the third stop valve (13), and the fourth stop valve (14) are integrated in a unit box.

9. The thermal management system of claim 1, wherein, The refrigerant main circuit further includes a third heat exchanger (15), a heating throttling valve (16), and a multi-way reversing valve (17); The third heat exchanger (15) has a first heat exchange part and a second heat exchange part in heat exchange with the first heat exchange part, and the multi-way reversing valve (17) is in communication with an exhaust side of the compressor (1), the first heat exchanger (2), the second heat exchanger (4), and the first heat exchange part, so as to switch the refrigerant circuit between a refrigeration mode and a heating mode; The second heat exchange part is in communication between the first heat exchanger (2) and the second heat exchanger (4), and the first heat exchange part is in communication between the multi-way reversing valve (17) and an inlet side of the compressor (1).

10. An energy storage container, characterized by The battery cabinet contains a plurality of battery packs, and the second heat exchanger (4) is provided with a plurality of second heat exchangers respectively attached to each of the battery packs.

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