Thermal management system, control method thereof and energy storage container

Abstract

The invention provides a heat management system, a control method thereof and an energy storage container. The heat management system comprises a compressor, a first heat exchanger, a throttling assembly, a second heat exchanger, a third heat exchanger and a multi-way valve, the third heat exchanger is provided with a first heat exchange part and a second heat exchange part exchanging heat with the first heat exchange part, and the multi-way valve communicates with an outlet of the compressor, the first heat exchanger, the second heat exchanger and the second heat exchange part so as to switch the working states of the first heat exchanger and the second heat exchanger; the first heat exchange part is communicated between the first heat exchanger and the second heat exchanger, and the second heat exchange part is communicated between the multi-way valve and an inlet of the compressor, so that a refrigerant flowing to the inlet of the compressor is subjected to heat exchange and temperature rise through the third heat exchanger. In this way, the refrigerant flowing back to the inlet of the compressor can be fully converted into the gas state, and stable operation of the compressor can be guaranteed.

Description

Technical Field

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

[0002] Energy storage technology can change the real-time characteristics of power transmission and make the use of electricity more flexible. It is a strategic support technology for the transformation of energy structure and the transformation of power production and consumption. With the continuous increase in energy storage demand, temperature control of energy storage system is a key link to ensure the normal operation of the system.

[0003] In the process of implementing the present invention, the inventors found that there are at least the following technical problems in the prior art:

[0004] In the prior art, the temperature control of energy storage batteries generally adopts direct cooling, using refrigerant as a heat transfer medium, and completing the heat exchange of energy storage batteries through the flow and phase change of the refrigerant. However, the temperature of the refrigerant flowing to the compressor is relatively low and is in a gas-liquid two-phase state. The liquid refrigerant will affect the stable operation of the compressor, causing safety hazards to the compressor. Summary of the invention

[0005] In view of this, the present application provides a thermal management system and a control method thereof, and an energy storage container, which can at least improve the problem of poor compressor stability in existing heat exchange methods.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A thermal management system for exchanging heat for a plurality of batteries in an energy storage system, comprising a compressor, a first heat exchanger, a throttling assembly and a second heat exchanger connected in sequence, and a third heat exchanger and a multi-way valve;

[0008] The third heat exchanger has a first heat exchange part and a second heat exchange part that exchanges heat with the first heat exchange part, and the multi-way valve communicates with the outlet of the compressor, the first heat exchanger, the second heat exchanger and the second heat exchange part to switch the working states of the first heat exchanger and the second heat exchanger;

[0009] The first heat exchange part is connected between the first heat exchanger and the second heat exchanger, and the second heat exchange part is connected between the multi-way valve and the inlet of the compressor to heat and heat up the refrigerant flowing to the inlet of the compressor through the third heat exchanger.

[0010] Optionally, in the heating mode, the outlet of the compressor is connected to the first heat exchanger through the multi-way valve, the second heat exchanger is connected to the second heat exchange part through the multi-way valve, the first interface is connected to the second interface, and the third interface is connected to the fourth interface, so that the refrigerant flowing out of the first heat exchanger of the internal heat exchanger can exchange heat with the refrigerant flowing out of the second heat exchanger of the external heat exchanger.

[0011] Optionally, in the refrigeration mode, the outlet of the compressor is connected to the second heat exchanger through the multi-way valve, the first heat exchanger is connected to the second heat exchange part through the multi-way valve, the first interface is connected to the third interface, and the second interface is connected to the fourth interface, so that the refrigerant flowing out of the second heat exchanger of the external heat exchanger can exchange heat with the refrigerant flowing out of the second heat exchanger of the external heat exchanger.

[0012] Optionally, a reversing structure is provided between the first heat exchanger, the second heat exchanger and the first heat exchange part, so that the flow direction of the refrigerant in the first heat exchange part is opposite to the flow direction of the refrigerant in the second heat exchange part in different modes.

[0013] Optionally, the switching structure includes:

[0014] a first branch, communicating the first heat exchanger and an inlet of the first heat exchange part;

[0015] a second branch, communicating the second heat exchanger with an outlet of the first heat exchange part;

[0016] a third branch, connecting the second heat exchanger and a first position on the first branch;

[0017] A fourth branch, connecting the first heat exchanger and a second position on the second branch;

[0018] Among them, a first one-way valve is arranged between the first heat exchanger and the first position to prevent the refrigerant from flowing from the first position to the first heat exchanger; a second one-way valve is arranged on the third branch to prevent the refrigerant from flowing from the first position to the second heat exchanger; a heating expansion valve is arranged on the second branch and is located between the second heat exchanger and the second position, and a cooling expansion valve is arranged on the fourth branch.

[0019] Optionally, a liquid reservoir is provided at the inlet of the first heat exchange part, and a dryer is provided at the outlet of the first heat exchange part.

[0020] Optionally, a pressure sensor and a first temperature sensor are provided at the inlet of the compressor.

[0021] Optionally, a second temperature sensor is disposed at the inlet of the first heat exchange part, and a third temperature sensor is disposed at the outlet of the first heat exchange part.

[0022] Optionally, an oil separator is provided at the outlet of the compressor, and the oil separator is connected to the inlet of the compressor through an oil return capillary.

[0023] Optionally, the multi-way valve has a first interface, a second interface, a third interface and a fourth interface, the first interface is connected to the outlet of the compressor, the second interface is connected to the first heat exchanger, the third interface is connected to the second heat exchanger, and the fourth interface is connected to the second heat exchange part. In different modes, different interfaces among the first interface, the second interface, the third interface and the fourth interface are connected in pairs.

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

[0025] The thermal management system and its control method, as well as the energy storage container provided by the present application, have the following characteristics: during operation, the high-temperature and high-pressure gaseous refrigerant flowing out of the outlet of the compressor passes through the second heat exchanger / first heat exchanger, and then flows through the first heat exchange part of the third heat exchanger for heat exchange and cooling. At the same time, the refrigerant flowing out of the first heat exchanger / second heat exchanger flows through the second heat exchange part for heat exchange and temperature increase, so that the refrigerant flowing back to the inlet of the compressor is more fully converted into a gaseous state, which is beneficial to improving the working performance of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 A schematic diagram of a thermal management system in a heating mode according to some embodiments;

[0028] Figure 2 A schematic diagram of a thermal management system in cooling mode is shown in some embodiments.

[0029] In the figure: 1. compressor; 2. multi-way valve; 3. first heat exchanger; 4. third heat exchanger; 5. second heat exchanger; 6. liquid storage tank; 7. dryer; 8. oil separator; 9. oil return capillary; 10. gas-liquid separator; 11. first temperature sensor; 12. second temperature sensor; 13. third temperature sensor; 14. fourth temperature sensor; 15. pressure sensor; 16. first non-return valve; 17. second non-return valve; 18. heating expansion valve; 19. cooling expansion valve. DETAILED DESCRIPTION

[0030] 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.

[0031] like Figure 1-Figure 2 As shown, an embodiment of the present application provides a thermal management system for exchanging heat between multiple batteries of an energy storage system (the batteries can be used for photovoltaic energy storage, as well as wind, light, water, fire, geothermal, tidal, nuclear, biomass, power grid and other electric energy fields) to keep the temperature of the batteries within a reasonable range. This can be used to heat the batteries or to cool the batteries. The thermal management system includes a refrigerant circuit, in which refrigerant flows, and the refrigerant flows and changes phase in the refrigerant circuit to heat up and cool down the various components in the refrigerant circuit.

[0032] The refrigerant circuit has a compressor 1, a multi-way valve 2, a first heat exchanger 3, a second heat exchanger 5 and a third heat exchanger 4, wherein the first heat exchanger 3 is used to directly exchange heat with the battery. For example, the first heat exchanger 3 is set as a heat exchange plate, and the heat or cold in the battery is taken away by the flow and phase change of the refrigerant in the heat exchange plate. The second heat exchanger 5 is in the external environment outside the battery, and plays the role of evaporation heat absorption or condensation heat release. The third heat exchanger 4 has a first heat exchange part and a second heat exchange part. The third heat exchanger 4 can exchange heat through the first heat exchange part and the second heat exchange part. For example, the first heat exchange part and the second heat exchange part are set as two adjacent heat exchange pipelines in the third heat exchanger 4.

[0033] The multi-way valve 2 has a first interface a, a second interface b, a third interface c and a fourth interface d. For example, the multi-way valve 2 is set as a four-way valve, and of course it can also be set as a five-way valve or a six-way valve. In different modes, different interfaces among the first interface, the second interface, the third interface and the fourth interface are connected in pairs, so as to switch the working mode of the thermal management system through the multi-way valve 2.

[0034] Among them, the first interface is connected to the outlet of the compressor 1, the second interface is connected to the first end of the first heat exchanger 3, the second end of the first heat exchanger 3 is connected to the first end of the second heat exchanger 5 through the first heat exchange part, the second end of the second heat exchanger 5 is connected to the third interface, and the fourth interface is connected to the inlet of the compressor 1 through the second heat exchange part. During the working process, the high-temperature and high-pressure gaseous refrigerant flowing out of the outlet of the compressor 1 passes through the second heat exchanger 5 / first heat exchanger 3, and then flows through the first heat exchange part of the third heat exchanger 4 for heat exchange and cooling. At the same time, the refrigerant flowing out of the first heat exchanger 3 / second heat exchanger 5 flows through the second heat exchange part for heat exchange and temperature increase, so that the refrigerant flowing back to the inlet of the compressor 1 is more fully converted into a gas state, which is conducive to improving the working performance of the compressor 1, thereby improving the heat exchange efficiency and working stability of the system, and can reduce the demand for gas-liquid separation equipment, thereby saving costs and reducing the space occupied by the system.

[0035] It should be noted that the first end and the second end of the first heat exchanger 3 are two ports respectively. In the first working mode, the refrigerant flows in from the first end of the first heat exchanger 3 and flows out from the second end. In the second working mode, the refrigerant flows in from the second end of the first heat exchanger 3 and flows out from the first end. That is, one of the first end and the second end is the inlet of the first heat exchanger 3, and the other is the outlet of the first heat exchanger 3. Correspondingly, the first end and the second end of the second heat exchanger 5 are two ports respectively. In the first working mode, the refrigerant flows in from the first end of the second heat exchanger 5 and flows out from the second end. In the other working mode, the refrigerant flows in from the second end of the second heat exchanger 5 and flows out from the first end. That is, one of the first end and the second end is the inlet of the second heat exchanger 5, and the other is the outlet of the second heat exchanger 5.

[0036] like Figure 1 As shown, in the heating mode, the first interface of the multi-way valve 2 is connected to the second interface, and the third interface is connected to the fourth interface. The compressor 1 compresses the low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant flowing out of the outlet of the compressor 1 flows to the first heat exchanger 3. The liquid refrigerant at room temperature after condensation by the first heat exchanger 3 first flows through the first heat exchange part, and then flows through the second heat exchanger 5. The refrigerant evaporated by the second heat exchanger 5 first flows through the second heat exchange part, and then flows back to the inlet of the compressor 1. Since the refrigerant temperature in the first heat exchange part is greater than the refrigerant temperature in the second heat exchange part, the refrigerant flowing out of the first heat exchanger 3 can be heat-exchanged with the refrigerant flowing out of the second heat exchanger 5 through the third heat exchanger 4, thereby heating the refrigerant flowing to the inlet of the compressor 1, so as to increase the temperature of the refrigerant flowing back to the inlet of the compressor 1 and increase the proportion of the gaseous refrigerant flowing back to the compressor 1.

[0037] like Figure 2As shown, in the refrigeration mode, the first interface of the multi-way valve 2 is connected to the third interface, and the second interface is connected to the fourth interface. The compressor 1 compresses the low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant flowing out of the outlet of the compressor 1 flows to the second heat exchanger 5. The liquid refrigerant at room temperature after condensation by the second heat exchanger 5 first flows through the first heat exchange part, and then flows through the first heat exchanger 3. The refrigerant evaporated by the first heat exchanger 3 first flows through the second heat exchange part, and then flows back to the inlet of the compressor 1. Since the temperature of the refrigerant in the first heat exchange part is greater than the temperature of the refrigerant in the second heat exchange part, the refrigerant flowing out of the second heat exchanger 5 can exchange heat with the refrigerant flowing out of the first heat exchanger 3 through the third heat exchanger 4, thereby heating the refrigerant flowing to the inlet of the compressor 1, so as to increase the temperature of the refrigerant flowing back to the inlet of the compressor 1 and increase the proportion of the gaseous refrigerant flowing back to the compressor 1. Moreover, the refrigerant flowing into the second heat exchange part can be made into wet steam with a dryness less than 1, and the superheating process is completely carried out in the second heat exchange part, thereby achieving only a two-phase state of constant temperature evaporation in the first heat exchanger during cooling, ensuring uniform temperature of multiple cells in the battery.

[0038] In some embodiments, the refrigerant circuit includes a reversing structure, which is arranged between the second end of the first heat exchanger 3, the first end of the second heat exchanger 5 and the first heat exchange part. Through the reversing action of the reversing structure, the refrigerant flow direction in the first heat exchange part can be opposite to the refrigerant flow direction in the second heat exchange part in different modes, thereby improving the heat exchange efficiency of the third heat exchanger 4.

[0039] The reversing structure includes a first branch, a second branch, a third branch and a fourth branch. The first branch is connected between the second end of the first heat exchanger 3 and the inlet of the first heat exchange part, the second branch is connected between the first end of the second heat exchanger 5 and the outlet of the first heat exchange part, the third branch is connected between the first end of the second heat exchanger 5 and the first position on the first branch, and the fourth branch is connected between the second end of the first heat exchanger 3 and the second position on the second branch. Among them, a first check valve 16 is provided on the first branch, and the first check valve 16 is located between the second end of the first heat exchanger 3 and the first position, and is used to unidirectionally prevent the refrigerant from flowing from the first position to the first heat exchanger 3. A second check valve 17 is provided on the third branch, and the third check valve is located between the first ends of the second heat exchanger 5, and is used to unidirectionally prevent the refrigerant from flowing from the first position to the second heat exchanger 5.

[0040] The second branch is provided with a heating expansion valve 18, which is located between the second heat exchanger 5 and the second position, and the fourth branch is provided with a cooling expansion valve 19, which is located between the second end and the second position of the first heat exchanger 3. In the heating mode, the heating expansion valve 18 is opened, and the cooling expansion valve 19 is closed, and the refrigerant flowing out of the second end of the first heat exchanger 3 first flows to the inlet of the first heat exchange part of the third heat exchanger 4 through the first branch, and then flows to the first end of the second heat exchanger 5 through the second branch. In the cooling mode, the cooling expansion valve 19 is opened, and the heating expansion valve 18 is closed, and the refrigerant flowing out of the first end of the second heat exchanger 5 first flows to the first position of the first branch through the third branch, and then flows to the inlet of the first heat exchange part of the third heat exchanger 4 through the first branch, and the refrigerant flowing out of the outlet of the first heat exchange part first flows to the second position of the second branch, and then flows to the second end of the first heat exchanger 3 through the fourth branch. In this way, by switching the reversing structure, in different modes, the refrigerant flows into the first heat exchange part from the first branch and then flows out of the first heat exchange part from the second branch, so that the flow direction of the refrigerant in the first heat exchange part is opposite to the flow direction of the refrigerant in the second heat exchange part, thereby improving the heat exchange efficiency of the third heat exchanger 4.

[0041] It should be noted that, in different modes, the inlet of the first heat exchange unit is connected to the first branch, the outlet of the first heat exchange unit is connected to the second branch, the inlet of the second heat exchange unit is connected to the fourth interface of the multi-way valve 2, and the outlet of the second heat exchange unit is connected to the inlet of the compressor 1. Moreover, the above-mentioned refrigeration expansion valve 19 and heating expansion valve 18 constitute the throttling components in this system to achieve stable operation of the system.

[0042] In some preferred solutions, the inlet of the first heat exchange part is provided with a liquid reservoir 6, for example, the liquid reservoir 6 is located on the first branch and between the first position and the inlet of the first heat exchanger, and the liquid storage cavity can store refrigerant, separate gas-liquid refrigerant and buffer pressure in the refrigerant circuit. The outlet of the first heat exchange part is provided with a dryer 7, the dryer 7 is located on the second branch and between the outlet of the first heat exchanger and the second position, and the dryer 7 can absorb moisture in the refrigerant and filter impurities in the refrigerant in the refrigerant circuit.

[0043] The inlet of the compressor 1 is provided with a pressure sensor 15 and a first temperature sensor 11, so that the refrigerant flowing out of the second heat exchange part passes through the first temperature sensor 11 and the pressure sensor 15 in sequence. Through the setting of the pressure sensor 15 and the first temperature sensor 11, the temperature and pressure of the refrigerant flowing back to the inlet of the compressor 1 can be detected, and then the power of the compressor 1, the wind speed of the second heat exchanger 5 and other controllable components in the refrigerant circuit can be adjusted according to the values ​​measured by the pressure sensor 15 and the first temperature sensor 11, so as to keep the temperature and pressure of the refrigerant flowing back to the compressor 1 within an appropriate range, thereby maximizing the proportion of gaseous refrigerant.

[0044] Further, the inlet of the first heat exchange part is provided with a second temperature sensor 12, which is provided on the first branch and located between the liquid storage tank 6 and the inlet of the first heat exchange part, and is used to detect the temperature of the refrigerant flowing to the inlet of the first heat exchange part. The outlet of the first heat exchange part is provided with a third temperature sensor 13, which is provided on the second branch and located between the outlet of the second heat exchange part and the dryer 7, and is used to sense the temperature of the refrigerant flowing out of the outlet of the first heat exchange part. In this way, by setting the second temperature sensor 12 and the third temperature sensor 13, the temperature difference between the inlet and outlet of the first heat exchange part can be obtained. When the heat exchange ratio of the third heat exchanger 4 is constant, the heat exchange amount of the third heat exchanger 4 can be obtained, and at the same time, the temperature difference between the inlet and outlet of the second heat exchange part and the outlet temperature of the second heat exchange part can be obtained. Then, the heat exchange amount of the third heat exchanger 4 can be adjusted according to the heat exchange amount of the third heat exchanger 4, so that the temperature of the refrigerant flowing back to the inlet of the compressor 1 is kept within a suitable range, and the proportion of the gaseous refrigerant is increased to the greatest extent.

[0045] In some embodiments, the outlet of the compressor 1 is provided with an oil separator 8, and the oil separator 8 is connected to the inlet of the compressor 1 through an oil return capillary 9. Specifically, in the cooling mode or the heating mode of the thermal management system, the main function of the oil separator 8 is to separate the oil from the gaseous high-temperature and high-pressure oil-medium mixture, and the oil deposited at the bottom is returned to the compressor through the oil return circuit, thereby ensuring the safe and efficient operation of the device. Of course, a filter module can be provided between the oil separator 8 and the oil return capillary 9 to filter impurities in the return oil.

[0046] The inlet of the compressor 1 is provided with a gas-liquid separator 10, which is located between the inlet of the compressor 1 and the pressure sensor 15, and the refrigerant returning through the oil separator 8 does not pass through the gas-liquid separator 10. Liquid refrigerant can be separated by the gas-liquid separator 10 to ensure that the refrigerant flowing into the inlet of the compressor 1 is in a gaseous state, thereby improving the safety and stability of the system. It should be noted that due to the setting of this system, the gas-liquid separation equipment can be omitted, but in order to further ensure that the refrigerant flowing back to the compressor 1 is in a gaseous state, the gas-liquid separator 10 can be set. Due to the system structure setting, the working requirements of the gas-liquid separator 10 are relatively small, and the volume of the gas-liquid separator 10 is smaller than that of the existing gas-liquid separation equipment, which can reduce the space occupied by the system to a certain extent.

[0047] The outlet of the compressor 1 is provided with a fourth temperature sensor 14, so that the refrigerant flowing out of the outlet of the compressor 1 first passes through the fourth temperature sensor 14, and then flows to the first interface of the multi-way valve 2. The fourth temperature sensor 14 is used to detect the temperature of the refrigerant flowing out of the outlet of the compressor 1, and then the power of the compressor 1, the wind speed of the second heat exchanger 5 and other controllable components in the refrigerant circuit can be adjusted according to the value measured by the fourth temperature sensor 14, so as to further improve the stability and controllability of the system.

[0048] The present application provides a control method for a thermal management system, based on the thermal management system in the above embodiment, comprising the following steps:

[0049] In the heating mode, the first interface and the second interface of the multi-way valve are controlled to be connected, and the third interface and the fourth interface are controlled to be connected, the heating expansion valve is controlled to be opened and the cooling expansion valve is controlled to be closed, and the compressor is controlled to be turned on, so that the refrigerant flowing out of the compressor flows through the first heat exchanger, the first heat exchange part, the heating expansion valve, the second heat exchanger and the second heat exchange part in sequence, and then flows back to the compressor;

[0050] Among them, Figure 1 As shown, in the heating mode, the first interface of the multi-way valve 2 is connected to the second interface, and the third interface is connected to the fourth interface. The compressor 1 compresses the low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant flowing out of the outlet of the compressor 1 flows to the first heat exchanger 3. The liquid refrigerant at room temperature after condensation by the first heat exchanger 3 first flows through the first heat exchange part, and then flows through the second heat exchanger 5. The refrigerant evaporated by the second heat exchanger 5 first flows through the second heat exchange part, and then flows back to the inlet of the compressor 1. Since the refrigerant temperature in the first heat exchange part is greater than the refrigerant temperature in the second heat exchange part, the refrigerant flowing out of the first heat exchanger 3 can be heat-exchanged with the refrigerant flowing out of the second heat exchanger 5 through the third heat exchanger 4, thereby heating the refrigerant flowing to the inlet of the compressor 1, so as to increase the temperature of the refrigerant flowing back to the inlet of the compressor 1 and increase the proportion of the gaseous refrigerant flowing back to the compressor 1.

[0051] In the cooling mode, the first interface and the third interface of the multi-way valve are controlled to be connected, and the second interface and the fourth interface are controlled to be connected, the refrigeration expansion valve is controlled to be opened and the heating expansion valve is controlled to be closed, and the compressor is controlled to be turned on, so that the refrigerant flowing out of the compressor flows through the second heat exchanger, the first heat exchange part, the refrigeration expansion valve, the first heat exchanger and the second heat exchange part in sequence, and then flows back to the compressor.

[0052] Among them, Figure 2As shown, in the refrigeration mode, the first interface of the multi-way valve 2 is connected to the third interface, and the second interface is connected to the fourth interface. The compressor 1 compresses the low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant flowing out of the outlet of the compressor 1 flows to the second heat exchanger 5. The liquid refrigerant at room temperature after condensation by the second heat exchanger 5 first flows through the first heat exchange part, and then flows through the first heat exchanger 3. The refrigerant evaporated by the first heat exchanger 3 first flows through the second heat exchange part, and then flows back to the inlet of the compressor 1. Since the temperature of the refrigerant in the first heat exchange part is greater than the temperature of the refrigerant in the second heat exchange part, the refrigerant flowing out of the second heat exchanger 5 can exchange heat with the refrigerant flowing out of the first heat exchanger 3 through the third heat exchanger 4, thereby heating the refrigerant flowing to the inlet of the compressor 1, so as to increase the temperature of the refrigerant flowing back to the inlet of the compressor 1 and increase the proportion of the gaseous refrigerant flowing back to the compressor 1. Moreover, the refrigerant flowing into the second heat exchange part can be made into wet steam with a dryness less than 1, and the superheating process is entirely carried out in the second heat exchange part, thereby achieving only a two-phase state of constant temperature evaporation in the first heat exchanger during refrigeration, ensuring uniform temperature of multiple cells in the energy storage battery.

[0053] The embodiment of the present application provides an energy storage container, including the thermal management system in the above embodiment. With such a configuration, during operation, the high-temperature and high-pressure gaseous refrigerant flowing out of the outlet of the compressor 1 passes through the second heat exchanger 5 / the first heat exchanger 3, and then flows through the first heat exchange part of the third heat exchanger 4 for heat exchange and cooling. At the same time, the refrigerant flowing out of the first heat exchanger 3 / the second heat exchanger 5 passes through the second heat exchange part for heat exchange and temperature increase, so that the refrigerant flowing back to the inlet of the compressor 1 is more fully converted into a gaseous state, which is conducive to improving the working performance of the compressor 1, and then improving the heat exchange efficiency and working stability of the system.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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 compressor, a first heat exchanger, a throttling assembly and a second heat exchanger connected in sequence, and a third heat exchanger and a multi-way valve; The third heat exchanger has a first heat exchange part and a second heat exchange part that exchanges heat with the first heat exchange part, and the multi-way valve communicates with the outlet of the compressor, the first heat exchanger, the second heat exchanger and the second heat exchange part to switch the working states of the first heat exchanger and the second heat exchanger; The first heat exchange part is connected between the first heat exchanger and the second heat exchanger, and the second heat exchange part is connected between the multi-way valve and the inlet of the compressor to heat and heat up the refrigerant flowing to the inlet of the compressor through the third heat exchanger.

2. The thermal management system according to claim 1, characterized in that: In the heating mode, the outlet of the compressor is connected to the first heat exchanger through the multi-way valve, and the second heat exchanger is connected to the second heat exchange part through the multi-way valve, so that the refrigerant flowing out of the first heat exchanger exchanges heat with the refrigerant flowing out of the second heat exchanger.

3. The thermal management system according to claim 1, characterized in that: In cooling mode, the outlet of the compressor is connected to the second heat exchanger through the multi-way valve, and the first heat exchanger is connected to the second heat exchange part through the multi-way valve, so that the refrigerant flowing out of the second heat exchanger exchanges heat with the refrigerant flowing out of the second heat exchanger.

4. The thermal management system according to claim 1, characterized in that: A reversing structure is provided between the first heat exchanger, the second heat exchanger and the first heat exchange part, so that the flow direction of the refrigerant in the first heat exchange part is opposite to the flow direction of the refrigerant in the second heat exchange part in different modes.

5. The thermal management system according to claim 4, characterized in that: The commutation structure comprises: a first branch, communicating the first heat exchanger and an inlet of the first heat exchange part; a second branch, communicating the second heat exchanger with an outlet of the first heat exchange part; a third branch, connecting the second heat exchanger and a first position on the first branch; A fourth branch, connecting the first heat exchanger and a second position on the second branch; Among them, a first one-way valve is arranged between the first heat exchanger and the first position to prevent the refrigerant from flowing from the first position to the first heat exchanger; a second one-way valve is arranged on the third branch to prevent the refrigerant from flowing from the first position to the second heat exchanger; a heating expansion valve is arranged on the second branch and is located between the second heat exchanger and the second position, and a cooling expansion valve is arranged on the fourth branch.

6. The thermal management system according to claim 5, characterized in that: The inlet of the first heat exchange part is provided with a liquid storage tank, and the outlet of the first heat exchange part is provided with a dryer.

7. The thermal management system according to claim 5, characterized in that: The inlet of the compressor is provided with a pressure sensor and a first temperature sensor.

8. The thermal management system according to claim 7, characterized in that: A second temperature sensor is disposed at the inlet of the first heat exchange portion, and a third temperature sensor is disposed at the outlet of the first heat exchange portion.

9. The thermal management system according to claim 1, characterized in that: The outlet of the compressor is provided with an oil separator, and the oil separator is communicated with the inlet of the compressor through an oil return capillary.

10. The thermal management system according to claim 1, characterized in that: The multi-way valve has a first interface, a second interface, a third interface and a fourth interface. The first interface is connected to the outlet of the compressor, the second interface is connected to the first heat exchanger, the third interface is connected to the second heat exchanger, and the fourth interface is connected to the second heat exchange part. In different modes, different interfaces among the first interface, the second interface, the third interface and the fourth interface are connected in pairs.

11. An energy storage container, characterized in that: The invention comprises a thermal management system as claimed in any one of claims 1 to 10.

12. A control method for a thermal management system, based on the thermal management system according to any one of claims 1 to 9, comprising: In heating mode: Control the first interface and the second interface of the multi-way valve to be connected, and the third interface and the fourth interface to be connected, control the heating expansion valve to be opened and the cooling expansion valve to be closed, and control the compressor to be turned on, so that the refrigerant flowing out of the compressor flows through the first heat exchanger, the first heat exchange part, the heating expansion valve, the second heat exchanger and the second heat exchange part in sequence, and then flows back to the compressor; In cooling mode: Control the first interface and the third interface of the multi-way valve to be connected, and the second interface and the fourth interface to be connected, control the refrigeration expansion valve to open and the heating expansion valve to close, and control the compressor to start, so that the refrigerant flowing out of the compressor flows through the second heat exchanger, the first heat exchange part, the refrigeration expansion valve, the first heat exchanger and the second heat exchange part in sequence, and then flows back to the compressor.

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