Thermal management system, control method thereof and energy storage container

Abstract

The invention provides a heat management system and a control method thereof and an energy storage container, and the heat management system comprises a refrigerant loop which is provided with a compressor, a first heat exchanger, a second heat exchanger and a third heat exchanger, and 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; an outlet of the compressor communicates with the first heat exchange part through the first heat exchanger or the second heat exchanger, and an inlet of the compressor communicates with the second heat exchange part, so that a refrigerant flowing to the inlet of the compressor is subjected to heat exchange and temperature rise through the third heat exchanger; and the temperature control assembly is used for sensing the heat exchange amount of the first heat exchange part and the second heat exchange part so as to adjust at least one of the second heat exchanger, the third heat exchanger and the compressor according to the heat exchange amount. Therefore, through the arrangement of the temperature control assembly, the heat exchange amount of the third heat exchanger can be regulated and controlled, so that only two phase states of constant-temperature evaporation exist in the first heat exchanger or the second heat exchanger, and uniform temperature of a plurality of battery cells in the battery is ensured.

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 the heat transfer medium, and completing the heat exchange of the energy storage battery through the flow and phase change of the refrigerant. Among them, the uniformity of the temperature of the battery cells in the energy storage battery is the core indicator. For the heat exchange state of the refrigerant inside the battery cell cold plate, the handling of the overheating process is particularly important. However, the existing direct cooling method has poor internal temperature uniformity of the heat exchanger for multiple batteries in the energy storage system, which in turn affects the stable operation of the energy storage battery. 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 internal temperature uniformity of a heat exchanger that exchanges heat for multiple batteries in an energy storage system.

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

[0007] A thermal management system for exchanging heat for multiple batteries of an energy storage system, comprising:

[0008] A refrigerant circuit, comprising a compressor, a first heat exchanger, a second heat exchanger and a third heat exchanger, wherein the third heat exchanger comprises a first heat exchange portion and a second heat exchange portion for exchanging heat with the first heat exchange portion, wherein the outlet of the compressor is connected to the first heat exchange portion through the first heat exchanger or the second heat exchanger, and the inlet of the compressor is connected to the second heat exchange portion, so that the refrigerant flowing to the inlet of the compressor is heat-exchanged and heated up through the third heat exchanger;

[0009] The temperature control component is used to sense the heat exchange amount between the first heat exchange part and the second heat exchange part, so as to adjust at least one of the second heat exchanger, the third heat exchanger and the compressor according to the heat exchange amount.

[0010] Optionally, the temperature control component includes:

[0011] a first temperature sensor, disposed at the outlet of the second heat exchange portion, for sensing the temperature of the refrigerant flowing to the inlet of the compressor;

[0012] The second temperature sensor and the third temperature sensor are respectively arranged at the inlet and the outlet of the first heat exchange part.

[0013] Optionally, the temperature control component includes a control module, and the second temperature sensor, the third temperature sensor, the first temperature sensor and the second heat exchanger are all communicatively connected to the control module to adjust the second heat exchanger according to the heat exchange amount.

[0014] Optionally, the second heat exchanger has a heat exchanger body and a fan, and the control module is communicatively connected with the fan to adjust the wind speed of the fan.

[0015] Optionally, a gas-liquid separator is provided at the inlet of the compressor to separate the gas and liquid of the refrigerant passing through the first temperature sensor.

[0016] Optionally, a pressure sensor is provided between the gas-liquid separator and the first temperature sensor.

[0017] Optionally, a fourth temperature sensor communicatively connected to the control module is provided at the outlet of the compressor.

[0018] Optionally, a liquid reservoir is provided at the inlet of the first heat exchange part, and the second temperature sensor is located between the liquid reservoir and the first heat exchange part; a dryer is provided at the outlet of the first heat exchange part, and the third temperature sensor is located between the dryer and the first heat exchange part.

[0019] Optionally, a multi-way valve is included, the multi-way valve has a first interface, a second interface, a third interface and a fourth interface, and different interfaces among the first interface, the second interface, the third interface and the fourth interface are connected in pairs in different modes;

[0020] The first interface is connected to the outlet of the compressor, the second interface is connected to the first end of the first heat exchanger, the second end of the first heat exchanger is connected to the first end of the second heat exchanger through the first heat exchange part, the second end of the second heat exchanger is connected to the third interface, and the fourth interface is connected to the inlet of the compressor through the second heat exchange part.

[0021] An energy storage container comprises a thermal management system as described in any one of the above items.

[0022] The thermal management system and its control method, and energy storage container provided by the present application, the temperature control component is used to sense the heat exchange between the first heat exchange part and the second heat exchange part, and then the second heat exchanger, the third heat exchanger, and at least one of the compressor can be adjusted automatically or manually according to the heat exchange. In the application process, the superheat of the return air state of the compressor 1 can be adjusted to 5K by the temperature control component. For example, the temperature control component can adjust the power of the compressor 1 or change the model of the compressor 1 so that the superheat of the return air state of the compressor 1 is set to a preset fixed value. For the third heat exchanger 4, the heat exchange is the supercooled liquid on the condensation side and the gas on the evaporation side. The temperature difference ratio between the two can be adjusted by the temperature control component, wherein the temperature difference ratio limit between the two is at least 1:1.3 for illustration, that is, the liquid on the high-pressure side is cooled by 1K, and the pure gas on the low-pressure side is heated by at least 1.3K. Under the condition that the outlet of the second heat exchange part (i.e., the return air outlet of the compressor 1) is overheated by 5K, the temperature difference before and after the first heat exchange part can be adjusted to at least 5K through the temperature control component. Since the mass flow rates of the first heat exchange part and the second heat exchange part are the same, the inlet of the second heat exchange part must be wet steam with a dryness less than 1 under such control, that is, the outlet of the first heat exchanger 3 or the second heat exchanger 5 (here the first heat exchanger 1 is taken as an example) in front of the second heat exchange part is wet steam, then there is only a two-phase evaporation process inside the first heat exchanger 3 without overheating, thereby ensuring the uniform temperature of the first heat exchanger 3 and the uniform temperature of multiple battery cells in the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 A schematic diagram of a thermal management system in a cooling mode according to some embodiments;

[0025] Figure 2 A schematic diagram of a thermal management system in a heating mode according to some embodiments.

[0026] 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

[0027] 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.

[0028] like Figure 1-Figure 2 As shown, an embodiment of the present application provides a thermal management system for exchanging heat for a battery (the battery can be used for photovoltaic energy storage, and can also be used in all electrical energy fields such as wind, light, water, fire, geothermal, tidal, nuclear energy, biomass energy, power grid, etc.) to keep the temperature of the battery within a reasonable range. It can be used to heat the battery or to cool the battery. The thermal management system includes a refrigerant circuit, in which a refrigerant flows, and the refrigerant flows and changes phase in the refrigerant circuit to heat up and cool down the various component positions in the refrigerant circuit.

[0029] The refrigerant circuit has a compressor 1, 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 configured as a heat exchange plate, and the refrigerant flows and changes phases in the heat exchange plate to take away the heat or cold in the battery. 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 configured as two adjacent heat exchange pipelines in the third heat exchanger 4.

[0030] The outlet of the compressor 1 is connected to the first heat exchange part through the first heat exchanger 3 or the second heat exchanger 5. The connection method is different in different working modes. For example, in the first working mode, the first heat exchanger 3 is connected between the outlet of the compressor 1 and the first heat exchange part, and in the second working mode, the second heat exchanger 5 is connected between the outlet of the compressor 1 and the first heat exchange part. The inlet of the compressor 1 is connected to the second heat exchange part, so that the refrigerant needs to flow through the second heat exchange part before flowing to the inlet of the compressor 1. 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 flows through the second heat exchange part for heat exchange and heating. The refrigerant flowing into the second heat exchange part can be made into wet steam with a dryness less than 1, and the overheating process is entirely carried out in the second heat exchange part. In this way, during refrigeration, only two-phase state of constant temperature evaporation is achieved in the first heat exchanger 3 or the second heat exchanger 5, thereby ensuring the uniform temperature of multiple battery cells in the battery.

[0031] The thermal management system includes a temperature control component, which is used to sense the heat exchange between the first heat exchange part and the second heat exchange part, and then adjust at least one of the second heat exchanger 5, the third heat exchanger 4 and the compressor 1 according to the heat exchange. Specifically, the temperature control component can be connected to at least one of the second heat exchanger 5, the third heat exchanger 4 and the compressor 1 in communication, and adjusted in an automatic control manner; in addition, the operator can adjust in a manual control manner according to the heat exchange obtained by the detection.

[0032] During the application, the temperature control component can be used to adjust the return air superheat of compressor 1 to 5K. For example, the temperature control component can adjust the power of compressor 1 or replace the model of compressor 1, so that the return air superheat of compressor 1 is set to a preset fixed value. For the third heat exchanger 4, the heat exchange is between the supercooled liquid on the condensation side and the gas on the evaporation side. The temperature difference ratio between the two can be adjusted by the temperature control component, where the temperature difference ratio limit between the two is at least 1:1.3 for illustration, that is, the liquid on the high-pressure side is cooled by 1K, and the pure gas on the low-pressure side is heated by at least 1.3K. Under the condition that the outlet of the second heat exchange part (i.e., the return air outlet of the compressor 1) is overheated by 5K, the temperature difference before and after the first heat exchange part can be adjusted to at least 5K through the temperature control component. Since the mass flow rates of the first heat exchange part and the second heat exchange part are the same, the inlet of the second heat exchange part must be wet steam with a dryness less than 1 under such control, that is, the outlet of the first heat exchanger 3 or the second heat exchanger 5 (here the first heat exchanger 1 is taken as an example) in front of the second heat exchange part is wet steam, then there is only a two-phase evaporation process inside the first heat exchanger 3 without overheating, thereby ensuring the uniform temperature of the first heat exchanger 3 and the uniform temperature of multiple battery cells in the battery.

[0033] In this solution, the thermal management system also includes a multi-way valve 2, which 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 to switch the working mode of the thermal management system through the multi-way valve 2. 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.

[0034] like Figure 1As shown, in the cooling 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 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 second heat exchanger 5 can be heat-exchanged with the refrigerant flowing out of the first heat exchanger 3 through the third heat exchanger 4, and then the refrigerant flowing to the inlet of the compressor 1 is heated, so that the refrigerant flowing into the second heat exchange part can be a wet vapor with a dryness less than 1. The superheating process is all carried out in the second heat exchange part, thereby realizing that there are only two-phase states of constant temperature evaporation in the first heat exchanger during refrigeration, ensuring the uniform temperature of multiple cells in the battery.

[0035] like Figure 2 As shown, in the heating mode, the first interface of the multi-way valve 2 is communicated with the second interface, and the third interface is communicated with 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 condensed 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, and then the refrigerant flowing to the inlet of the compressor 1 is heated, so that the refrigerant flowing into the second heat exchange part can be wet steam with a dryness less than 1. The overheating process is entirely carried out in the second heat exchange part, thereby realizing that there are only two-phase states of constant temperature evaporation in the second heat exchanger during heating, which is beneficial to ensure the uniform temperature of multiple battery cells in the battery.

[0036] 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.

[0037] In some embodiments, the temperature control component includes a first temperature sensor 11, a second temperature sensor 12, and a third temperature sensor 13. The first temperature sensor 11 is arranged between the outlet of the second heat exchange part and the inlet of the compressor 1, and is used to sense the temperature of the refrigerant flowing to the inlet of the compressor 1. The second temperature sensor 12 is arranged at the inlet of the first heat exchange part, and is used to detect the temperature of the refrigerant flowing in from the inlet of the first heat exchange part. The third temperature sensor 13 is arranged at the outlet of the first heat exchange part, and is used to detect the temperature of the refrigerant flowing out from the outlet of the first heat exchange part. In this way, the temperature difference between the inlet and outlet of the first heat exchange part can be obtained according to the induction values ​​of the second temperature sensor 12 and the third temperature sensor 13. 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 the temperature difference between the inlet and outlet of the second heat exchange part can be obtained at the same time. In this way, the power of the compressor 1, the wind speed of the second heat exchanger 5, and other controllable components in the refrigerant circuit are adjusted according to the values ​​measured by multiple temperature sensors, so that the temperature of the refrigerant flowing back to the compressor 1 is kept within a suitable range, which is conducive to improving the timeliness of regulation.

[0038] In the preferred embodiment, the temperature control component also includes a control module to facilitate automatic control of the system and save labor costs. The first temperature sensor 11, the second temperature sensor 12, the third temperature sensor 13 and the second heat exchanger 5 are all connected to the control module for communication. The control module can regulate the second heat exchanger 5 according to the heat exchange capacity of the third heat exchanger 4, so that the refrigerant flowing into the second heat exchange part is wet steam with a dryness less than 1, and the overheating process is all carried out in the second heat exchange part, thereby achieving only two-phase state of constant temperature evaporation in the first heat exchanger during refrigeration, ensuring uniform temperature of multiple cells in the battery.

[0039] The second heat exchanger 5 has a heat exchanger body and a fan. The rotation of the fan drives the airflow through the heat exchanger body to accelerate the heat exchange of the heat exchanger body. The control module is connected to the fan for adjusting the wind speed of the fan. When the temperature difference between the inlet and outlet of the first heat exchange part is less than a preset value, the control module controls the speed of the fan to decrease, thereby increasing the inlet temperature of the first heat exchange part. When the temperature difference between the inlet and outlet of the first heat exchange part is greater than a preset value, the control module controls the speed of the fan to increase, thereby reducing the inlet temperature of the first heat exchange part.

[0040] Of course, in other schemes, the control module can be connected to the compressor 1 for communication, and the heat exchange capacity of the third heat exchanger 4 can be increased or decreased by controlling the operating power of the compressor 1, thereby adjusting the inlet and outlet temperature difference between the first heat exchange part and the second heat exchange part.

[0041] In some preferred embodiments, a gas-liquid separator 10 is provided between the inlet of the compressor 1 and the first temperature sensor 11, for performing gas-liquid separation on the refrigerant passing through the first temperature sensor 11 and flowing to the inlet of the compressor 1. Liquid refrigerant can be separated by the gas-liquid separator 10, ensuring that the refrigerant flowing into the inlet of the compressor 1 is gaseous, thereby improving the safety and stability of the system.

[0042] A pressure sensor 15 is provided between the gas-liquid separator 10 and the first temperature sensor 11, so that the refrigerant flowing out of the second heat exchange part passes through the first temperature sensor 11, the pressure sensor 15 and the gas pressure separator in sequence. The pressure sensor 15 can detect the pressure of the refrigerant flowing back to the inlet of the compressor 1, and communicate with the control module, and then can adjust the power of the compressor 1, the wind speed of the second heat exchanger 5 and other controllable components in the refrigerant circuit according to the value measured by the pressure sensor 15, so as to further improve the stability and controllability of the system.

[0043] 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 connected to the control module for communication, and 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.

[0044] 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.

[0045] 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.

[0046] 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 through 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.

[0047] 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.

[0048] 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 second temperature sensor 12, 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 third temperature sensor 13 and the second position, and the dryer 7 can absorb moisture in the refrigerant and filter impurities in the refrigerant in the refrigerant circuit.

[0049] The present application embodiment provides a control method for a thermal management system, based on the thermal management system in the above embodiment, including:

[0050] Obtaining sensing values ​​of the first temperature sensor and the second temperature sensor, and calculating the inlet and outlet temperature difference of the first heat exchange part;

[0051] Obtaining a sensing value of a third temperature sensor and calculating an inlet temperature of the second heat exchange part;

[0052] Determining whether the inlet temperature of the second heat exchange part is greater than a preset value;

[0053] If so, the fan speed of the second heat exchanger is controlled to decrease, or the power of the compressor is controlled to increase, or the heat exchange ratio of the third heat exchanger is controlled to increase.

[0054] Among them, the heat exchange ratio of the third heat exchanger can be set to a fixed value. According to the calculated inlet and outlet temperature difference of the first heat exchange part and the outlet temperature of the second heat exchange part obtained by sensing, the inlet temperature of the second heat exchange part, that is, the outlet temperature of the first heat exchanger, can be further calculated, and the outlet temperature of the first heat exchanger can be regulated. When the inlet temperature of the second heat exchange part is greater than the preset value, the second heat exchanger, the compressor and the third heat exchanger can be regulated, for example, the fan speed of the second heat exchanger can be controlled, or the power of the compressor can be controlled, or the heat exchange ratio of the third heat exchanger can be controlled.

[0055] During the application, the temperature control component can be used to adjust the return air superheat of compressor 1 to 5K. For example, the temperature control component can adjust the power of compressor 1 or replace the model of compressor 1, so that the return air superheat of compressor 1 is set to a preset fixed value. For the third heat exchanger 4, the heat exchange is between the supercooled liquid on the condensation side and the gas on the evaporation side. The temperature difference ratio between the two can be adjusted by the temperature control component, where the temperature difference ratio limit between the two is at least 1:1.3 for illustration, that is, the liquid on the high-pressure side is cooled by 1K, and the pure gas on the low-pressure side is heated by at least 1.3K. Under the condition that the outlet of the second heat exchange part (i.e., the return air outlet of the compressor 1) is overheated by 5K, the temperature difference before and after the first heat exchange part can be adjusted to at least 5K through the temperature control component. Since the mass flow rates of the first heat exchange part and the second heat exchange part are the same, the inlet of the second heat exchange part must be wet steam with a dryness less than 1 under such control, that is, the outlet of the first heat exchanger 3 or the second heat exchanger 5 (here the first heat exchanger 1 is taken as an example) in front of the second heat exchange part is wet steam, then there is only a two-phase evaporation process inside the first heat exchanger 3 without overheating, thereby ensuring the uniform temperature of the first heat exchanger 3 and the uniform temperature of multiple cells in the energy storage battery.

[0056] The embodiment of the present application provides an energy storage container, including the thermal management system in the above embodiment. In this way, through the regulation of the temperature control component, it can be ensured that the temperature of the refrigerant flowing back to the inlet of the compressor 1 is kept within a reasonable range.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 to exchange heat for multiple batteries in an energy storage system, including: A refrigerant circuit, comprising a compressor, a first heat exchanger, a second heat exchanger and a third heat exchanger, wherein the third heat exchanger comprises a first heat exchange portion and a second heat exchange portion for exchanging heat with the first heat exchange portion, wherein the outlet of the compressor is connected to the first heat exchange portion through the first heat exchanger or the second heat exchanger, and the inlet of the compressor is connected to the second heat exchange portion, so that the refrigerant flowing to the inlet of the compressor is heat-exchanged and heated up through the third heat exchanger; A temperature control component is used to sense the heat exchange amount between the first heat exchange part and the second heat exchange part, so as to adjust at least one of the second heat exchanger, the third heat exchanger and the compressor according to the heat exchange amount.

2. The thermal management system according to claim 1, characterized in that: The temperature control component comprises: a first temperature sensor, disposed at the outlet of the second heat exchange portion, for sensing the temperature of the refrigerant flowing to the inlet of the compressor; The second temperature sensor and the third temperature sensor are respectively arranged at the inlet and the outlet of the first heat exchange part.

3. The thermal management system according to claim 2, characterized in that: The temperature control component includes a control module, and the second temperature sensor, the third temperature sensor, the first temperature sensor and the second heat exchanger are all communicatively connected to the control module to adjust the second heat exchanger according to the heat exchange amount.

4. The thermal management system according to claim 3, characterized in that: The second heat exchanger has a heat exchanger body and a fan, and the control module is communicatively connected with the fan to adjust the wind speed of the fan.

5. The thermal management system according to claim 2, characterized in that: The inlet of the compressor is provided with a gas-liquid separator to separate the refrigerant passing through the first temperature sensor into gas and liquid.

6. The thermal management system according to claim 5, characterized in that: A pressure sensor is arranged between the gas-liquid separator and the first temperature sensor.

7. The thermal management system according to claim 4, characterized in that: A fourth temperature sensor is disposed at the outlet of the compressor and is communicatively connected to the control module.

8. The thermal management system according to claim 2, characterized in that: A liquid reservoir is disposed at the inlet of the first heat exchange part, and the second temperature sensor is located between the liquid reservoir and the first heat exchange part; a dryer is disposed at the outlet of the first heat exchange part, and the third temperature sensor is located between the dryer and the first heat exchange part.

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

10. An energy storage container, characterized in that: The invention comprises 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: Obtaining sensing values ​​of the first temperature sensor and the second temperature sensor, and calculating the inlet and outlet temperature difference of the first heat exchange part; Obtaining a sensing value of a third temperature sensor and calculating an inlet temperature of the second heat exchange part; determining whether the temperature of the inlet of the second heat exchange part is greater than a preset value; If so, the fan speed of the second heat exchanger is controlled to decrease, or the power of the compressor is controlled to increase, or the heat exchange ratio of the third heat exchanger is controlled to increase.

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