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

Abstract

The invention provides a heat management system, an energy storage container and a control method of the heat management system, and the heat management system is used for carrying out heat exchange on a plurality of batteries of an energy storage system and comprises a refrigerant loop. The refrigerant loop comprises a compressor, a first heat exchanger exchanging heat with the environment, a second heat exchanger exchanging heat with the battery, a gas-liquid separator and an oil separator arranged on the outlet side of the compressor, and the oil separator is connected with the inlet side of the compressor through an oil return capillary tube. The battery is directly subjected to heat exchange through the refrigerant loop only through the refrigerant, and only the refrigerant serves as a heat exchange medium, so that the heat exchange efficiency of the battery can be improved; and the thermal management system is simple in structure. In addition, when the refrigerant loop is in a cooling mode or a heating mode, the oil separator separates oil in the gaseous high-temperature and high-pressure oil-medium mixture, the oil deposited on the lower portion is recycled to the compressor through the oil return capillary tube, and therefore safe and efficient operation of the compressor is guaranteed.

Description

Technical Field

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

[0002] In the field of energy storage systems, the batteries in the energy storage systems have high requirements for the temperature they are in, and a thermal management system is required to ensure that the batteries are within a certain temperature range. In the process of realizing the present invention, the inventors found that the prior art has at least the following technical features: when using a refrigerant circuit to exchange heat for the battery, the lubricating oil in the compressor will flow into the refrigerant circuit, resulting in poor lubrication of the compressor. Summary of the invention

[0003] In view of this, the present application provides a thermal management system that can at least solve the problem of poor lubrication effect of the compressor of the thermal management system. The present application also provides an energy storage container including the above thermal management system. The present application also provides a control method applicable to the above thermal management system.

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

[0005] A thermal management system for exchanging heat for multiple batteries of an energy storage system, comprising a refrigerant circuit, the refrigerant circuit comprising a compressor, a first heat exchanger for exchanging heat with the environment, a second heat exchanger for exchanging heat with the battery, a gas-liquid separator, and an oil separator arranged on the outlet side of the compressor, and the oil separator is connected to the inlet side of the compressor through an oil return capillary.

[0006] Optionally, the thermal management system also includes a multi-way valve, which includes a first interface connected to the compressor, a second interface connected to the first heat exchanger, a third interface connected to the gas-liquid separator, and a fourth interface connected to the second heat exchanger, and in different modes, different interfaces among the first interface, the second interface, the third interface and the fourth interface are connected in pairs.

[0007] Optionally, a liquid reservoir and a filter are provided between the first heat exchanger and the second heat exchanger.

[0008] Optionally, the thermal management system includes:

[0009] A first branch is connected to the air supply port of the compressor and the filter;

[0010] a second branch connected in parallel with the first branch, the first branch being connected to the compressor, and the first heat exchanger, the liquid reservoir and the filter being arranged on the first branch;

[0011] A third heat exchanger includes a first heat exchange portion and a second heat exchange portion that exchanges heat with the first heat exchange portion;

[0012] The first heat exchange part is arranged in the first branch, the second heat exchange part is arranged in the second branch, and a first throttling element is arranged on the inlet side of the first heat exchange part in the first branch.

[0013] Optionally, the thermal management system also includes:

[0014] A second branch and a third branch are arranged between the compressor and the second heat exchanger and are arranged in series in sequence, wherein the second branch comprises a first pipeline section, a second pipeline section and a third pipeline section which are connected in series in sequence, wherein the first pipeline section is provided with the first heat exchanger, the third pipeline section is provided with the liquid reservoir, the second heat exchange part and the filter, and the third branch is provided with a second throttling element;

[0015] a fourth branch connected in parallel with the second pipeline section and the third pipeline section, and a third throttling element is arranged on the fourth branch;

[0016] a fifth branch, connected in parallel with the third pipeline section and the third branch;

[0017] Wherein, the second pipeline section and the fifth branch are both provided with regulating valves for adjusting the flow direction of the refrigerant, so that in the cooling mode or the heating mode, the refrigerant flows through the liquid reservoir and the filter in sequence, and 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.

[0018] Optionally, the second pipeline section is provided with a first one-way valve that only allows the refrigerant to flow from the first pipeline section to the third pipeline section, and the fifth branch is provided with a second one-way valve that only allows the refrigerant to flow from the second heat exchanger to the third pipeline section.

[0019] Optionally, both the first throttling element and the second throttling element are electronic expansion valves.

[0020] An energy storage container comprises any one of the thermal management systems described above.

[0021] A control method for a thermal management system, applicable to any of the thermal management systems described above, comprises the following steps:

[0022] In heating mode:

[0023] Control the first interface and the fourth interface of the multi-way valve to be connected and the second interface and the third interface to be connected, control the first throttle and the third throttle to be opened, control the second throttle to be closed, and control the compressor to start; so that the refrigerant discharged from the compressor flows through the first interface of the multi-way valve, the fourth interface of the multi-way valve, the second heat exchanger, and the second heat exchange part of the third heat exchanger in sequence, and the refrigerant is divided into two parts; one part of the refrigerant flows through the first throttle and the first heat exchange part of the third heat exchanger and then flows to the air supply port of the compressor; the other part of the refrigerant flows through the third throttle, the first heat exchanger, the second interface of the multi-way valve, the third interface of the multi-way valve, and the gas-liquid separator and then flows back to the compressor;

[0024] In cooling mode:

[0025] 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 first throttle and the second throttle to be opened, control the third throttle to be closed, and control the compressor to start; so that the refrigerant discharged from the compressor flows through the first interface of the multi-way valve, the second interface of the multi-way valve, the first heat exchanger, and the second heat exchange part of the third heat exchanger in sequence, and the refrigerant is divided into two parts; one part of the refrigerant flows through the first throttle and the first heat exchange part of the third heat exchanger and then flows to the air supply port of the compressor; the other part of the refrigerant flows through the second throttle, the second heat exchanger, the fourth interface of the multi-way valve, the third interface of the multi-way valve, and the gas-liquid separator and then flows back to the compressor.

[0026] The thermal management system provided in the present application is provided with a refrigerant circuit, and the refrigerant circuit includes a compressor, a first heat exchanger, a throttling device and a second heat exchanger. Among them, the first heat exchanger is used for heat exchange with the environment, and the second heat exchanger is used for heat exchange with the battery. The refrigerant flows from the compressor to the first heat exchanger, the throttling device and the second heat exchanger in the refrigerant circuit in sequence to cool the battery; the refrigerant flows from the compressor to the second heat exchanger, the throttling device and the first heat exchanger in the refrigerant circuit in sequence to heat the battery. In this arrangement, in addition, when the refrigerant circuit is in cooling mode or heating mode, the oil separator is used to reduce the oil circulation rate in the system so that as much oil as possible remains in the compressor to ensure the lubrication of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1A schematic diagram of the structure of the thermal management system provided in this embodiment;

[0029] Figure 2 It is a schematic diagram of the structure of the thermal management system in cooling mode;

[0030] Figure 3 It is a structural schematic diagram of the thermal management system in heating mode.

[0031] Figure 1-Figure 3 middle:

[0032] 1- compressor, 2- first heat exchanger, 3- second heat exchanger, 4- gas-liquid separator, 5- oil separator, 6- oil return capillary, 7- multi-way valve, 8- liquid reservoir, 9- filter, 10- first branch, 11- second branch, 12- third heat exchanger, 13- first throttling element, 14- third branch, 15- fourth branch, 16- fifth branch, 17- second throttling element, 18- third throttling element, 19- first check valve, 20- second check valve;

[0033] 1101 - first pipeline section, 1102 - second pipeline section, 1103 - third pipeline section. DETAILED DESCRIPTION

[0034] The present application provides a thermal management system. The present application also provides an energy storage container including the thermal management system. The present application also provides a control method applicable to the thermal management system.

[0035] 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.

[0036] like Figure 1-Figure 3 As shown, an embodiment of the present application provides a thermal management system, which is a component of an energy storage container and is used to exchange heat for multiple batteries of the energy storage system, that is, the thermal management system is used to cool or heat the batteries so that the batteries are at a suitable operating temperature. The thermal management system includes a refrigerant circuit, including a compressor 1, a first heat exchanger 2 for heat exchange with the environment, a throttling device, and a second heat exchanger 3 for heat exchange with the battery, which are connected in sequence; the refrigerant circuit includes an oil separator 5 arranged on the outlet side of the compressor 1, and the oil separator 5 is connected to the inlet side of the compressor 1 through an oil return capillary 6. In addition, a gas-liquid separator 4 is also provided on the inlet side of the compressor 1.

[0037] In this embodiment, an optional implementation is provided. When the battery temperature is high, the refrigerant circuit needs to cool the battery. Figure 2 The specific working mode is as follows: first, the compressor 1 works to compress the refrigerant into a high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant flows to the first heat exchanger 2. At this time, the first heat exchanger 2 is a condenser, and the high-temperature and high-pressure refrigerant exchanges heat with the external environment in the first heat exchanger 2, and the high-temperature and high-pressure refrigerant becomes a medium-temperature and high-pressure refrigerant; then, the medium-temperature and high-pressure refrigerant flowing out of the first heat exchanger 2 flows to the throttling device, and the throttling device throttles the medium-temperature and high-pressure refrigerant into a low-temperature and low-pressure refrigerant, and the low-temperature and low-pressure refrigerant flows to the second heat exchanger 3; the low-temperature and low-pressure refrigerant flowing through the second heat exchanger 3 exchanges heat with the battery, and transfers the cold in the refrigerant to the battery to achieve cooling of the battery; then, the refrigerant with a higher temperature flowing out of the second heat exchanger 3 flows to the gas-liquid separator 4, and the gas-liquid separator 4 separates the gas and liquid in the refrigerant, and the gaseous refrigerant flows back to the compressor 1, thereby completing a cooling cycle for the battery.

[0038] In this embodiment, another optional implementation is provided, the compressor 1, the second heat exchanger 3, the throttling device, the first heat exchanger 2 and the gas-liquid separator 4 are connected in sequence, and the refrigerant system is configured in this way to form a heating cycle. At this time, the battery temperature is low and the battery needs to be heated. Figure 3 The specific working mode is as follows: first, the compressor 1 works to compress the refrigerant into a high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant flows to the second heat exchanger 3. The high-temperature and high-pressure refrigerant flowing through the second heat exchanger 3 exchanges heat with the battery, and the refrigerant transfers heat to the battery to achieve heating of the battery; then, the high-pressure refrigerant with a reduced temperature flowing out of the second heat exchanger 3 flows to the throttling device, and the throttling device throttles the high-pressure refrigerant with a reduced temperature into a low-pressure refrigerant; then, the low-pressure refrigerant flows to the first heat exchanger 2. At this time, the first heat exchanger 2 is an evaporator, and the low-pressure refrigerant absorbs heat from the environment through the first heat exchanger 2, and the temperature of the refrigerant increases; finally, the refrigerant with a raised temperature flows through the gas-liquid separator 4, and the gas-liquid separator 4 separates the gas and liquid in the refrigerant, and the gaseous refrigerant flows back to the compressor 1, thereby completing a heating cycle for the battery.

[0039] Furthermore, when the thermal management system is in cooling mode or heating mode, the oil separator 5 is used to reduce the oil circulation rate in the system so that as much oil as possible remains in the compressor to ensure the lubrication of the compressor.

[0040] It should be noted that the battery can be used in all electric energy fields such as photovoltaic power generation, tidal power generation, thermal power generation, nuclear power generation, geothermal power generation, hydropower generation, biomass power generation or wind power generation.

[0041] The above-mentioned thermal management system is provided with a refrigerant circuit, and the refrigerant circuit includes a compressor 1, a first heat exchanger 2, an electronic expansion valve, a second heat exchanger 3 and a gas-liquid separator 4. Among them, the first heat exchanger 2 is used for heat exchange with the environment, the second heat exchanger 3 is used for heat exchange with the battery, and the refrigerant flows forward in the refrigerant circuit to cool the battery, and the refrigerant flows reversely in the refrigerant circuit to heat the battery. In this arrangement, the battery is directly heat-exchanged only through the refrigerant through the refrigerant circuit. In this application, only the refrigerant is used as the heat exchange medium, reducing the setting of heat exchange media such as water, which can improve the heat exchange efficiency of the battery; and the thermal management system has a simple structure. .

[0042] In some embodiments, the thermal management system further includes a multi-way valve 7, the multi-way valve 7 includes a first interface ( Figure 1 a port in the middle), and a second port connected to the first heat exchanger 2 ( Figure 1 b port), and a third port connected to the gas-liquid separator 4 ( Figure 1 c port), and the fourth interface with the second heat exchanger 3 ( Figure 1 d port in the middle), and in different modes, the first interface, the second interface, the third interface and the fourth interface are connected in pairs. Exemplarily, when the first interface and the second interface are connected, and the third interface and the fourth interface are connected, the refrigerant circuit is in cooling mode; that is, when the battery needs to be cooled, the first interface and the second interface are connected, and the third interface and the fourth interface are connected; when the first interface and the fourth interface are connected, and the second interface and the third interface are connected, the refrigerant circuit is in cooling and heating mode; that is, when the battery needs to be heated, the first interface and the fourth interface are connected, and the second interface and the third interface are connected.

[0043] It should be noted that the first interface, the second interface, the third interface and the fourth interface are connected in pairs, which means that when the first interface and the second interface are connected, the third interface and the fourth interface are connected; when the first interface and the fourth interface are connected, the second interface and the third interface are connected.

[0044] Here, by setting a multi-way valve 7 respectively connected to the compressor 1, the first heat exchanger 2, the gas-liquid separator 4 and the second heat exchanger 3, the connection relationship between the compressor 1, the first heat exchanger 2, the gas-liquid separator 4 and the second heat exchanger 3 in the refrigerant circuit can be adjusted by connecting different interfaces of the multi-way valve 7, thereby realizing the switching of different modes of the refrigerant circuit.

[0045] In some embodiments, a liquid reservoir 8 and a filter 9 are provided between the first heat exchanger 2 and the second heat exchanger 3. Specifically, the liquid reservoir 8 is used to store refrigerant to ensure that the system can adjust and stabilize the circulation amount of the refrigerant when the working conditions change. The filter 9 is used to filter impurities in the refrigerant. The filter 9 is used to filter impurities and particles in the refrigerant to prevent the throttling component from being blocked and causing system abnormalities.

[0046] In some embodiments, the thermal management system includes a first branch 10, a second branch 11 and a third heat exchanger 12, wherein the first branch 10 is connected to the air supply port of the compressor 1 and the filter 9; the second branch 11 is connected in parallel with the first branch 10, and the first branch 10 is connected to the compressor 1, and the first branch 10 is provided with a first heat exchanger 2, a liquid storage tank 8 and a filter 9; the third heat exchanger 12 includes a first heat exchange part and a second heat exchange part that exchanges heat with the first heat exchange part; wherein the first heat exchange part is provided in the first branch 10, the second heat exchange part is provided in the second branch 11, and a first throttling device 13 is provided at the inlet side of the first heat exchange part in the first branch 10. wherein the second branch 11 is used as a main circuit circulation, and the first branch 10 is used as an auxiliary circuit circulation.

[0047] Specifically, in the cooling mode, the compressor 1 starts to compress the refrigerant into high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant flows to the first heat exchanger 2 of the second branch 11, and exchanges heat with the external environment in the first heat exchanger 2 to become medium-temperature and high-pressure refrigerant, and the medium-temperature and high-pressure refrigerant flows to the second heat exchange part of the third heat exchanger 12, and the refrigerant flowing out of the second heat exchange part is divided into two parts; one part of the refrigerant flows to the first throttling device 13 of the first branch 10, and the opening of the first throttling device 13 is adjusted to throttle this part of the refrigerant into a relatively low-temperature medium-pressure refrigerant, and the relatively low-temperature medium-pressure refrigerant flows to the first heat exchange part of the third heat exchanger 12, and the flow The lower temperature and medium pressure refrigerant passing through the first heat exchange part exchanges heat with the medium temperature and high pressure refrigerant passing through the second heat exchange part to reduce the temperature of the refrigerant passing through the second heat exchange part. Then, the refrigerant passing through the first heat exchange part flows to the air supply port of the compressor 1; another part of the refrigerant flows to the second throttling device 17, and the second throttling device 17 throttles the medium temperature and high pressure refrigerant to low temperature and low pressure refrigerant. The low temperature and low pressure refrigerant flows to the second heat exchanger 3 and transfers the cold to the battery. The refrigerant flowing out of the second heat exchanger 3 flows through the gas-liquid separator 4 and then flows back to the compressor 1; the above two parts of refrigerant both flow back to the compressor 1 to complete a cooling cycle for the battery. Here, the medium-temperature and medium-pressure refrigerant is directed to the air supply port of the compressor 1 by setting the first branch 10, so as to realize air supply and enthalpy increase for the compressor 1 in the cooling mode, and divide the original single-stage compression process into a quasi-two-stage compression process, thereby increasing the unit cooling capacity, reducing the exhaust temperature at the outlet of the compressor 1, expanding the cooling temperature range, enhancing the cooling effect, and significantly improving the energy utilization rate of the compressor 1 in the cooling mode, thereby improving the efficiency of the compressor 1 and the performance of the cooling mode.

[0048] In the heating mode, the compressor 1 starts to compress the refrigerant into high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant flows to the second heat exchanger 3, and transfers heat to the battery in the second heat exchanger 3. The refrigerant after flowing through the second heat exchanger 3 is divided into two parts; among them, one part of the refrigerant flows to the first throttling device 13 of the first branch 10, and the opening of the first throttling device 13 is adjusted to throttle this part of the refrigerant into medium-pressure refrigerant, and the medium-pressure refrigerant flows to the first heat exchange part of the third heat exchanger 12, and the medium-pressure refrigerant flowing through the first heat exchange part flows to The air supply port of compressor 1; another part of the refrigerant flows to the second heat exchange part of the third heat exchanger 12 of the second branch 11, and exchanges heat with the refrigerant flowing through the first heat exchange part, and then the refrigerant flowing out of the second heat exchange part flows to the third throttling member 18 and is throttled to a low-temperature and low-pressure refrigerant, and then the refrigerant flows to the first heat exchanger 2 to exchange heat with the external environment and heat up, and the refrigerant with increased temperature flows through the gas-liquid separator 4 and then flows back to the compressor 1; the above two parts of refrigerant both flow back to the compressor 1 to complete a heating cycle for the battery. Here, the first branch 10 is set to guide the medium-temperature and medium-pressure refrigerant to the air supply port of the compressor 1, so as to realize the air supply and enthalpy increase of the compressor 1 in the heating mode, and increase the mass flow of the compressor 1 in the low temperature environment, thereby increasing the heating amount of the battery, expanding the heating temperature range, and significantly increasing the heating amount under low ambient temperature.

[0049] In some embodiments, the thermal management system further includes a second branch 11, a third branch 14, a fourth branch 15 and a fifth branch 16, wherein the second branch 11 and the third branch 14 are sequentially arranged in series and are arranged between the compressor 1 and the second heat exchanger 3, and the second branch 11 includes a first pipeline section 1101, a second pipeline section 1102 and a third pipeline section 1103 which are sequentially connected in series, wherein the first pipeline section 1101 is provided with a first heat exchanger 2, the third pipeline section 1103 is provided with a liquid storage device 8, a second heat exchange unit and a filter 9, and the third branch 1101 is provided with a second heat exchange unit 1102 and a filter 9, and the third branch 1103 is provided with a second heat exchange unit 1103 and a third heat exchange unit 1104. The second throttling device 17 is provided; the fourth branch 15 is connected in parallel with the second pipeline section 1102 and the third pipeline section 1103, and the third throttling device 18 is provided on the fourth branch 15; the fifth branch 16 is connected in parallel with the third pipeline section 1103 and the third branch 14; wherein the second pipeline section 1102 and the fifth branch 16 are both provided with regulating valves for regulating the flow direction of the refrigerant, so that in the cooling mode or the heating mode, the refrigerant flows through the liquid storage tank 8 and the filter 9 in sequence, and 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.

[0050] In this way, when the refrigerant circuit is in the cooling mode, the refrigerant compressed by the compressor 1 flows through the first heat exchanger 2 of the first pipeline section 1101, then flows through the regulating valve of the second pipeline section 1102, and then flows through the liquid storage tank 8, the second heat exchange part and the filter 9 of the third pipeline section 1103 in sequence; the refrigerant flowing out of the filter 9 is divided into two parts, one part of the refrigerant flows to the second throttling device 17 of the third branch 14 and then flows to the second heat exchanger 3; the other part of the refrigerant flows to the first branch 10 and flows through the first throttling device 13 and the first heat exchange part in sequence and then flows back to the air supply port of the compressor 1. When the refrigerant circuit is in the heating mode, the refrigerant flowing out of the second heat exchanger 3 flows through the regulating valve of the fifth branch 16, and then flows through the liquid storage tank 8, the second heat exchange part and the filter 9 of the third pipeline section 1103 in sequence; the refrigerant flowing out of the filter 9 is also divided into two parts, one part of which flows to the third throttling device 18 of the fourth branch 15 and then flows to the first heat exchanger 2; the other part of the refrigerant flows to the first branch 10 and flows through the first throttling device 13 and the first heat exchange part in sequence and then flows back to the air supply port of the compressor 1. In this way, whether the refrigerant circuit is in the cooling mode or the heating mode, the flow directions of the refrigerant in the first heat exchange part of the third heat exchanger 12 and the second heat exchange part of the third heat exchanger 12 are opposite, which can improve the heat exchange efficiency of the refrigerant flowing through the first heat exchange part and the refrigerant flowing through the second heat exchange part. Moreover, no matter whether the refrigerant circuit is in cooling mode or heating mode, the refrigerant flows through the liquid reservoir 8 and the filter 9 in sequence. Such a configuration can also improve the replenishment of the refrigerant in the system by the liquid reservoir 8 and improve the filtering effect of the refrigerant filter 9 on the refrigerant.

[0051] In some embodiments, the second pipeline section 1102 is provided with a first one-way valve 19 that only allows the refrigerant to flow from the first pipeline section 1101 to the third pipeline section 1103, and the fifth branch 16 is provided with a second one-way valve 20 that only allows the refrigerant to flow from the second heat exchanger 3 to the third pipeline section 1103. Here, by setting the above-mentioned regulating valve as a one-way valve, the control logic of the refrigerant circuit can be simplified.

[0052] In addition, it can also be set in other ways, for example, a solenoid valve capable of controlling the on-off of the second pipeline section 1102 is set in the second pipeline section 1102, and correspondingly, a solenoid valve capable of controlling the on-off of the second pipeline section 1102 is set in the fifth branch 16.

[0053] In some embodiments, the first throttle member 13 and the second throttle member 17 are both electronic expansion valves. Specifically, the electronic expansion valve can use electrical signals to accurately control the opening, and efficiently adjust the opening while achieving energy saving. In addition, the electronic expansion valve has strong adaptability and can accurately adjust the opening in different environments.

[0054] In addition, the first throttle member 13 and the second throttle member 17 can both be a throttle valve or a capillary tube.

[0055] An energy storage container includes any one of the above mentioned thermal management systems. Since the energy storage container includes the above mentioned thermal management system, the beneficial effects of the thermal management system on the energy storage container can be found in the above mentioned contents and will not be described in detail here.

[0056] A control method for a thermal management system, applicable to any of the above thermal management systems, comprises the following steps:

[0057] In heating mode:

[0058] The first interface (port a) and the fourth interface (port d) of the multi-way valve 7 are controlled to be connected, and the second interface (port b) and the third interface (port c) are controlled to be connected, the first throttle 13 and the third throttle 18 are controlled to be opened, the second throttle 17 is controlled to be closed, and the compressor 1 is controlled to start; so that the refrigerant discharged from the compressor 1 flows through the first interface of the multi-way valve 7, the fourth interface of the multi-way valve 7, the second heat exchanger 3, and the second heat exchange part of the third heat exchanger 12 in sequence, and the refrigerant is divided into two parts; one part of the refrigerant flows through the first throttle 13 and the first heat exchange part of the third heat exchanger 12 and then flows to the air supply port of the compressor 1; the other part of the refrigerant flows through the third throttle 18, the first heat exchanger 2, the second interface of the multi-way valve 7, the third interface of the multi-way valve 7, and the gas-liquid separator 4 and then flows back to the compressor 1;

[0059] In cooling mode:

[0060] Control the first interface and the second interface of the multi-way valve 7 to be connected and the third interface and the fourth interface to be connected, control the first throttle 13 and the second throttle 17 to be opened, control the third throttle 18 to be closed, and control the compressor 1 to start; so that the refrigerant discharged from the compressor 1 flows through the first interface of the multi-way valve 7, the second interface of the multi-way valve 7, the first heat exchanger 2, and the second heat exchange part of the third heat exchanger 12 in sequence, and the refrigerant is divided into two parts; one part of the refrigerant flows through the first throttle 13 and the first heat exchange part of the third heat exchanger 12 and then flows to the air supply port of the compressor 1; the other part of the refrigerant flows through the second throttle 17, the second heat exchanger 3, the fourth interface of the multi-way valve 7, the third interface of the multi-way valve 7, and the gas-liquid separator 4 and then flows back to the compressor 1.

[0061] Such a setting can facilitate the switching of the thermal management system between different modes and improve the degree of automation of the thermal management system, so that the thermal management system can realize heat exchange of the battery in different temperature modes to ensure that the battery is at a suitable operating temperature.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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, the refrigerant circuit comprising: A compressor, a first heat exchanger for exchanging heat with the environment, a throttling element, and a second heat exchanger for exchanging heat with the battery, which are connected in sequence; An oil separator is arranged on the outlet side of the compressor, and the oil separator is connected to the inlet side of the compressor through an oil return capillary tube.

2. The thermal management system according to claim 1, characterized in that: It also includes a multi-way valve, which includes a first interface connected to the compressor, a second interface connected to the first heat exchanger, a third interface connected to the gas-liquid separator, and a fourth interface connected to the second heat exchanger, and in different modes, different interfaces among the first interface, the second interface, the third interface and the fourth interface are connected in pairs.

3. The thermal management system according to claim 2, characterized in that: A liquid reservoir and a filter are arranged between the first heat exchanger and the second heat exchanger.

4. The thermal management system according to claim 3, characterized in that: include: A first branch is connected to the air supply port of the compressor and the filter; a second branch connected in parallel with the first branch, the first branch being connected to the compressor, and the first heat exchanger, the liquid reservoir and the filter being arranged on the first branch; A third heat exchanger includes a first heat exchange portion and a second heat exchange portion that exchanges heat with the first heat exchange portion; The first heat exchange part is arranged in the first branch, the second heat exchange part is arranged in the second branch, and a first throttling element is arranged on the inlet side of the first heat exchange part in the first branch.

5. The thermal management system according to claim 4, characterized in that: Also includes: A second branch and a third branch are arranged between the compressor and the second heat exchanger and are arranged in series in sequence, wherein the second branch comprises a first pipeline section, a second pipeline section and a third pipeline section which are connected in series in sequence, wherein the first pipeline section is provided with the first heat exchanger, the third pipeline section is provided with the liquid reservoir, the second heat exchange part and the filter, and the third branch is provided with a second throttling element; a fourth branch connected in parallel with the second pipeline section and the third pipeline section, and a third throttling element is arranged on the fourth branch; a fifth branch, connected in parallel with the third pipeline section and the third branch; Wherein, the second pipeline section and the fifth branch are both provided with regulating valves for adjusting the flow direction of the refrigerant, so that in the cooling mode or the heating mode, the refrigerant flows through the liquid reservoir and the filter in sequence, and 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.

6. The thermal management system according to claim 5, characterized in that: The second pipeline section is provided with a first one-way valve that only allows the refrigerant to flow from the first pipeline section to the third pipeline section, and the fifth branch is provided with a second one-way valve that only allows the refrigerant to flow from the second heat exchanger to the third pipeline section.

7. The thermal management system according to claim 5, characterized in that: The first throttling element and the second throttling element are both electronic expansion valves.

8. An energy storage container, characterized in that: A thermal management system comprising any one of claims 1-7.

9. A control method for a thermal management system, characterized in that: A thermal management system applicable to any one of claims 1 to 7, comprising the following steps: In heating mode: Control the first interface and the fourth interface of the multi-way valve to be connected and the second interface and the third interface to be connected, control the first throttle and the third throttle to be opened, control the second throttle to be closed, and control the compressor to start; so that the refrigerant discharged from the compressor flows through the first interface of the multi-way valve, the fourth interface of the multi-way valve, the second heat exchanger, and the second heat exchange part of the third heat exchanger in sequence, and the refrigerant is divided into two parts; one part of the refrigerant flows through the first throttle and the first heat exchange part of the third heat exchanger and then flows to the air supply port of the compressor; the other part of the refrigerant flows through the third throttle, the first heat exchanger, the second interface of the multi-way valve, the third interface of the multi-way valve, and the gas-liquid separator and then flows back to the compressor; In cooling 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 first throttle and the second throttle to be opened, control the third throttle to be closed, and control the compressor to start; so that the refrigerant discharged from the compressor flows through the first interface of the multi-way valve, the second interface of the multi-way valve, the first heat exchanger, and the second heat exchange part of the third heat exchanger in sequence, and the refrigerant is divided into two parts; one part of the refrigerant flows through the first throttle and the first heat exchange part of the third heat exchanger and then flows to the air supply port of the compressor; the other part of the refrigerant flows through the second throttle, the second heat exchanger, the fourth interface of the multi-way valve, the third interface of the multi-way valve, and the gas-liquid separator and then flows back to the compressor.

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