Energy storage thermal management system

Abstract

The present disclosure provides an energy storage thermal management system, belonging to the technical field of thermal management. The energy storage thermal management system comprises a converter loop, a battery pack loop, a compression loop and a control unit; the converter loop comprises at least one energy storage converter and a first heat exchanger, the battery pack loop comprises at least one battery pack, a second heat exchanger, a first multi-way valve and a heating unit, the compression loop comprises a compressor, the second heat exchanger and a third heat exchanger, and the battery pack loop and the compression loop are coupled through the second heat exchanger; wherein the control unit is used to control the connection relationship between the first heat exchanger and the first multi-way valve and the conduction state of the first multi-way valve, so that the first heat exchanger or a pipeline is selected to couple between the converter loop and the battery pack loop. The embodiment of the present disclosure can reduce the overall flow resistance of the system, improve the efficiency, and be suitable for diversified temperature control scenes.

Description

Technical Field

[0001] This disclosure relates to the field of thermal management technology, and in particular to an energy storage thermal management system. Background Technology

[0002] In related technologies, temperature control is required for the battery pack (PACK) and power conversion system (PCS) in energy storage thermal management systems. Commonly used temperature control schemes include a hybrid scheme of air-cooled PCS and liquid-cooled battery pack, or a dual liquid-cooled scheme of liquid-cooled PCS and liquid-cooled battery pack. However, in the hybrid scheme, the heat dissipation performance of the air-cooled PCS may fail to meet the requirements as the PCS load increases. In the dual liquid-cooled scheme, configuring independent cooling systems for the PACK and PCS leads to higher costs, and using a dual-loop system results in complex piping structures and greater control difficulty. Summary of the Invention

[0003] This disclosure provides an energy storage thermal management system.

[0004] In a first aspect, embodiments of this disclosure provide an energy storage thermal management system, comprising: a converter circuit, a battery pack circuit, a compression circuit, and a control unit; the converter circuit includes at least one energy storage converter and a first heat exchanger, the battery pack circuit includes at least one battery pack, a second heat exchanger, a first multi-way valve, and a heating unit, the compression circuit includes a compressor, the second heat exchanger, and a third heat exchanger, and the battery pack circuit and the compression circuit are coupled through the second heat exchanger; wherein, the control unit is used to control the connection relationship between the first heat exchanger and the first multi-way valve and the conduction state of the first multi-way valve, so that the converter circuit and the battery pack circuit are coupled by selecting either the first heat exchanger or a pipeline. Optionally, the control unit is used to control the inlet end and outlet end of the first heat exchanger to be connected across the two valves of the first multi-way valve, so that the converter circuit and the battery pack circuit are coupled through the first heat exchanger; or, the control unit is used to control a target pipeline connected to the outlet end of the first heat exchanger to be connected across the two valves of the first multi-way valve, so that the converter circuit and the battery pack circuit are coupled through the target pipeline.

[0005] Optionally, the control unit is further configured to control the first multi-way valve to be in a first open state to select the battery pack and the second heat exchanger to form a first battery pack sub-loop; when the inlet and outlet ends of the first heat exchanger are connected between the two valves of the first multi-way valve, the control unit is further configured to control the first multi-way valve to be in a second open state to select the battery pack, the first heat exchanger, and the second heat exchanger to form a second battery pack sub-loop; and the control unit is further configured to select the energy storage converter and the first heat exchanger to form a first converter sub-loop, or select the energy storage converter, the first heat exchanger, and the third heat exchanger to form a second converter sub-loop, wherein the second converter sub-loop is coupled to the compression loop through the third heat exchanger; when the target pipe is connected between the two valves of the first multi-way valve, the control unit is further configured to control the first multi-way valve to be in a second open state to select the battery pack, the target pipe, and the second heat exchanger to form a third battery pack sub-loop, and select the energy storage converter, the first heat exchanger, and the target pipe to form a third converter sub-loop.

[0006] Optionally, the first battery pack sub-circuit and the compression circuit exchange heat through the second heat exchanger; the second battery pack sub-circuit and the first converter sub-circuit exchange heat through the first heat exchanger; or, the second battery pack sub-circuit and the second converter sub-circuit exchange heat through the first heat exchanger; the third battery pack sub-circuit and the third converter sub-circuit exchange heat through mixing of a heat transfer medium in the target pipeline.

[0007] Optionally, the first multi-way valve is a three-way valve or a three-way proportional valve; the inlet and outlet ends of the first heat exchanger are respectively connected to the first valve and the second valve of the first multi-way valve, and the second valve and the third valve of the first multi-way valve are also respectively connected to the second heat exchanger and the battery pack, and the second heat exchanger is connected to the battery pack; or, one end of the target pipe adjacent to the outlet end of the first heat exchanger is connected to the first valve of the first multi-way valve, and the other end of the target pipe is connected to the second valve of the second multi-way valve, and the second valve and the third valve of the first multi-way valve are also respectively connected to the second heat exchanger and the battery pack, and the second heat exchanger is connected to the battery pack.

[0008] Optionally, the first conduction state refers to the first valve of the first multi-way valve being closed, and the second and third valves being connected; when the first multi-way valve is a three-way valve, the second conduction state refers to the second valve of the first multi-way valve being closed, and the first and third valves being connected; when the first multi-way valve is a three-way proportional valve, the second conduction state includes the second valve of the first multi-way valve being closed, and the first and third valves being connected, or the three valves of the first multi-way valve control the flow rate of each valve based on three preset flow split ratios corresponding to the three valves, where any preset flow split ratio is greater than zero.

[0009] Optionally, the compression circuit further includes a second multi-way valve; the control unit is also used to control the second multi-way valve to cause the compressor, the second heat exchanger and the third heat exchanger to perform a positive Carnot cycle or a reverse Carnot cycle.

[0010] Optionally, the second multi-way valve is a four-way valve, the second heat exchanger is an evaporator, and the third heat exchanger is a condenser; the first valve and the second valve of the second multi-way valve are respectively connected to the two ends of the compressor, the third valve and the fourth valve of the second multi-way valve are respectively connected to the second heat exchanger and the third heat exchanger, and the second heat exchanger and the third heat exchanger are connected to each other.

[0011] Optionally, the control unit is further configured to control the second multi-way valve to a third open state, so that the compressor, the second heat exchanger, and the third heat exchanger perform a positive Carnot cycle; and the control unit is further configured to control the second multi-way valve to a fourth open state, so that the compressor, the second heat exchanger, and the third heat exchanger perform a reverse Carnot cycle; wherein, the third open state means that the first valve and the third valve of the second multi-way valve are connected, and the second valve and the fourth valve are also connected, and the fourth open state means that the first valve and the fourth valve of the second multi-way valve are connected, and the second valve and the third valve are also connected.

[0012] Optionally, the control unit is further configured to: control the energy storage thermal management system to enter a heating mode when the temperature of the battery pack in the energy storage thermal management system is less than a preset battery temperature threshold; control the energy storage thermal management system to enter a heating mode when the temperature of the battery pack is greater than or equal to the preset battery temperature threshold and the ambient temperature is greater than or equal to a first ambient temperature threshold; control the energy storage thermal management system to enter a wind-cooling mode when the temperature of the battery pack is greater than or equal to the preset battery temperature threshold and the ambient temperature is less than the first ambient temperature threshold and greater than a second ambient temperature threshold; and control the energy storage thermal management system to enter a waste heat utilization mode when the temperature of the battery pack is greater than or equal to the preset battery temperature threshold and the ambient temperature is less than or equal to the second ambient temperature threshold.

[0013] The energy storage thermal management system provided in this disclosure includes a converter circuit, a battery pack circuit, a compression circuit, and a control unit. The converter circuit includes at least one energy storage converter and a first heat exchanger. The battery pack circuit includes at least one battery pack, a second heat exchanger, a first multi-way valve, and a heating unit. The compression circuit includes a compressor, a second heat exchanger, and a third heat exchanger. The battery pack circuit and the compression circuit are coupled through the second heat exchanger. The control unit controls the connection between the first heat exchanger and the first multi-way valve, as well as the conduction state of the first multi-way valve, so that the converter circuit and the battery pack circuit can be coupled through either the first heat exchanger or a pipe. Whether the converter circuit and the battery pack circuit are coupled through the first heat exchanger or through a pipe, it is equivalent to the converter circuit and the battery pack circuit being connected in parallel. Compared to the related technologies that connect two circuits in series for heat exchange, the parallel connection reduces the overall system flow resistance, improves efficiency, and, because the first heat exchanger or a pipe can be selected for heat exchange between the converter circuit and the battery pack circuit, it is applicable to diverse temperature control scenarios, expanding its scope of application.

[0014] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the embodiments of the present disclosure to explain the disclosure and do not constitute a limitation thereof. The above and other features and advantages will become more apparent to those skilled in the art from the detailed description of exemplary embodiments with reference to the accompanying drawings, in which: Figure 1 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure.

[0016] Figure 2 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure.

[0017] Figure 3 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure.

[0018] Figure 4 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure.

[0019] Figure 5 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure.

[0020] Figure 6 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure.

[0021] Figure 7 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure.

[0022] Figure 8 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure.

[0023] Figure 9 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure.

[0024] Figure 10 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure.

[0025] Figure 11 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure.

[0026] Figure 12 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure.

[0027] Figure 13 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure.

[0028] Figure 14 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure.

[0029] Figure 15 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure.

[0030] Figure 16 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure.

[0031] Figure 17This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure.

[0032] Figure 18 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of this disclosure, exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments of this disclosure to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0034] Where there is no conflict, the various embodiments of this disclosure and the features thereof in the embodiments may be combined with each other.

[0035] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0036] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded. Words such as “connected” or “linked” are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect.

[0037] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this disclosure, and will not be interpreted as having an idealized or overly formal meaning, unless expressly so defined herein.

[0038] For energy storage systems, temperature control of the battery pack (PACK) and power supply converter (PCS) is typically required. Common energy storage devices employ either an air-cooled PCS paired with a liquid-cooled battery pack, or a combination of a liquid-cooled PCS and a liquid-cooled battery pack. However, the heat dissipation performance of air-cooled PCS cannot meet the increasing load requirements of the PCS, and temperature control is ineffective in complex environments. In dual liquid-cooled solutions, independent cooling systems are typically configured for the battery pack and PCS, or a dual-loop system is used to achieve liquid cooling for both. Independent cooling systems require two separate cooling units, resulting in low energy efficiency and high system costs. Dual-loop systems require decoupling (connection / shutdown) between the battery pack loop and the PCS loop, typically using four-way or multi-way valves. However, flow control is difficult with four-way valves, and multi-way valves have complex piping structures, making control even more challenging.

[0039] In related technologies, for the four-way valve solution, the energy storage converter cycle and the battery pack cycle are connected in series after the four-way valve switches. However, there is a large difference in the flow rate and flow resistance between the energy storage converter cycle and the battery pack cycle. After being connected in series, it will affect the performance and reliability of the water pump, and the overall flow resistance will be greater, which will easily lead to a reduction in system efficiency. In addition, the current multi-way valve solution has a complex structure, is difficult to control, and is expensive, which is not conducive to its promotion.

[0040] In view of this, the present disclosure provides an energy storage thermal management system that, while achieving the temperature control function of existing solutions, solves problems such as complex system structure and high cooling / heating power consumption. Software control is easier to implement, and reliability is improved. Furthermore, the PCS loop and PACK loop in the system can be connected in parallel via heat exchangers and mixed-flow pipes, reducing the overall flow resistance of the system, resulting in a more rational layout, higher efficiency, and a wider range of pump selection options.

[0041] The energy storage thermal management system provided in this disclosure includes a converter circuit, a battery pack circuit, a compression circuit, and a control unit. The converter circuit includes at least one energy storage converter and a first heat exchanger. The battery pack circuit includes at least one battery pack, a second heat exchanger, a first multi-way valve, and a heating unit. The compression circuit includes a compressor, a second heat exchanger, and a third heat exchanger. The battery pack circuit and the compression circuit are coupled through the second heat exchanger. The control unit controls the connection between the first heat exchanger and the first multi-way valve, as well as the conduction state of the first multi-way valve, so that the converter circuit and the battery pack circuit can be coupled through either the first heat exchanger or a pipe. Whether the converter circuit and the battery pack circuit are coupled through the first heat exchanger or through a pipe, it is equivalent to the converter circuit and the battery pack circuit being connected in parallel. Compared to the related technologies that connect two circuits in series for heat exchange, the parallel connection reduces the overall system flow resistance, improves efficiency, and, because the first heat exchanger or a pipe can be selected for heat exchange between the converter circuit and the battery pack circuit, it is applicable to diverse temperature control scenarios, expanding its scope of application.

[0042] The first aspect of this disclosure provides an energy storage thermal management system.

[0043] Figure 1 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 1 The energy storage thermal management system includes: a converter circuit 10, a battery pack circuit 20, a compression circuit 30, and a control unit; The inverter circuit 10 includes at least one energy storage inverter 110 and a first heat exchanger 210; the battery pack circuit 20 includes at least one battery pack 310, a second heat exchanger 220, a first multi-way valve 410 and a heating unit 510; the compression circuit 30 includes a compressor 610, a second heat exchanger 220 and a third heat exchanger 230, and the battery pack circuit 20 and the compression circuit 30 are coupled through the second heat exchanger 220. The control unit is used to control the connection between the first heat exchanger 210 and the first multi-way valve 410, as well as the conduction state of the first multi-way valve 410, so that the converter circuit 10 and the battery pack circuit 20 can be coupled by either the first heat exchanger 210 or a pipeline. Figure 1 The diagram shows the case where the inverter circuit 10 and the battery pack circuit 20 are coupled using the first heat exchanger 210.

[0044] A heat exchanger is a device that allows heat exchange between two fluids at different temperatures. In some optional embodiments, the first heat exchanger 210 can be a water-air heat exchanger, the second heat exchanger 220 can be an evaporator, and the third heat exchanger 230 can be a water-water heat exchanger (such as a condenser) or a water-air heat exchanger. The above descriptions of the types of heat exchangers are merely illustrative and are not intended to limit the scope of this disclosure.

[0045] It should be noted that the energy storage thermal management system may also include functional units such as water tanks, water pumps, and expansion valves, and this embodiment does not impose any limitations on this. In addition, the control unit can be understood as an abstract functional unit, which has the function of controlling the connection relationship between the first heat exchanger 210 and the first multi-way valve 410 and the conduction state of the first multi-way valve 410.

[0046] In some alternative embodiments, the control unit is used to control the inlet and outlet ends of the first heat exchanger 210 to be connected between the two valves of the first multi-way valve 410, so that the converter circuit 10 and the battery pack circuit 20 are coupled through the first heat exchanger 210; or, the control unit is used to control the target pipe connected to the outlet end of the first heat exchanger 210 to be connected between the two valves of the first multi-way valve 410, so that the converter circuit 10 and the battery pack circuit 20 are coupled through the target pipe.

[0047] Therefore, by controlling the connection relationship between the first heat exchanger 210 and the multiple valves of the first multi-way valve 410, and then controlling the conduction state of the first multi-way valve 410, the converter circuit 10 and the battery pack circuit 20 can be coupled through the first heat exchanger or through the target pipeline. This coupling can be understood as thermal coupling, meaning that heat can be transferred between the two coupled circuits.

[0048] It should be noted that, regardless of whether the inverter circuit 10 and the battery pack circuit 20 are coupled through the first heat exchanger 210 or through the target pipe, they are essentially connected in parallel (through the first heat exchanger 210 or the target pipe). In related technologies, when controlling heat exchange between the inverter circuit and the battery pack circuit using a multi-way valve, the two circuits are usually connected in series. Considering the significant differences in flow rate and flow resistance between the inverter circuit and the battery pack circuit, connecting them in series would affect the performance and reliability of the water pump, and increase the overall flow resistance, thus reducing system efficiency. In this embodiment, the first multi-way valve 410 can control the inverter circuit 10 and the battery pack circuit 20 to be connected in parallel through the first heat exchanger 210 or the target pipe. Compared to the series connection scheme, this effectively reduces the overall system flow resistance, has a more reasonable layout, higher system efficiency, and allows for a wider range of applicable water pumps.

[0049] In summary, in this embodiment of the present disclosure, the energy storage thermal management system includes a converter circuit, a battery pack circuit, a compression circuit, and a control unit. The converter circuit includes at least one energy storage converter and a first heat exchanger. The battery pack circuit includes at least one battery pack, a second heat exchanger, a first multi-way valve, and a heating unit. The compression circuit includes a compressor, a second heat exchanger, and a third heat exchanger. The battery pack circuit and the compression circuit are coupled through the second heat exchanger. The control unit is used to control the connection relationship between the first heat exchanger and the first multi-way valve, as well as the conduction state of the first multi-way valve, so that the converter circuit and the battery pack circuit can be coupled by selecting either the first heat exchanger or a pipeline. In this case, whether the inverter circuit and the battery pack circuit are coupled through the first heat exchanger or through a pipe, it is equivalent to the inverter circuit and the battery pack circuit being connected in parallel. Compared with the implementation method of connecting the two circuits in series for heat exchange in related technologies, the parallel scheme can reduce the overall flow resistance of the system and improve efficiency. Furthermore, since the first heat exchanger or the pipe can be selected for heat exchange between the inverter circuit and the battery pack circuit, it can be applied to a variety of temperature control scenarios, thus expanding the scope of application.

[0050] The following is combined with Figures 2 to 4 The energy storage thermal management system of this disclosure will be described in detail.

[0051] In some optional embodiments, the first multi-way valve is a three-way valve or a three-way proportional valve; correspondingly, the inlet end and outlet end of the first heat exchanger are respectively connected to the first valve and the second valve of the first multi-way valve, the second valve and the third valve of the first multi-way valve are also respectively connected to the second heat exchanger and the battery pack, and the second heat exchanger is connected to the battery pack.

[0052] Figure 2 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 2 The energy storage thermal management system includes: a converter circuit 10, a battery pack circuit 20, a compression circuit 30, and a control unit; wherein, the converter circuit 10 includes an energy storage converter 110, a first heat exchanger 210, and a first water pump 810; the battery pack circuit 20 includes a battery pack 310, a first heat exchanger 210, a second heat exchanger 220, a first multi-way valve 410, a heating unit 510, and a second water pump 820; the compression circuit 30 includes a compressor 610, a second heat exchanger 220, a third heat exchanger 230, and an expansion valve 910. A water tank 710 is used to store the heat medium flowing in the pipelines of the energy storage thermal management system.

[0053] Furthermore, such as Figure 2As shown, the first multi-way valve 410 is a three-way valve, including a first valve 411, a second valve 412, and a third valve 413. The inlet and outlet ends of the first heat exchanger 210 are respectively connected to the first valve 411 and the second valve 412 of the first multi-way valve. The second valve 412 of the first multi-way valve 410 is connected to the second heat exchanger 220 through a second water pump 820 and a heating unit 510 connected in series. The other end of the second heat exchanger 220 is connected to the third valve 413 of the first multi-way valve 410 through the battery pack 310. With this connection method, the converter circuit 10 and the battery pack circuit 20 are connected in parallel through the first heat exchanger 210, so that the converter circuit 10 and the battery pack circuit 20 can be thermally coupled through the first heat exchanger 210, and the battery pack circuit 20 and the compression circuit 30 can be coupled through the second heat exchanger 220. In other words, the converter circuit 10 and the battery pack circuit 20 can mix at the first heat exchanger 210.

[0054] In some optional embodiments, the compression circuit also includes a second multi-way valve; correspondingly, the control unit is also used to control the second multi-way valve to cause the compressor, the second heat exchanger, and the third heat exchanger to perform a forward Carnot cycle or a reverse Carnot cycle. The Carnot cycle transfers heat energy from a high-temperature region to a low-temperature region, while the reverse Carnot cycle is the reverse process of the forward Carnot cycle, transferring heat energy from a low-temperature region to a high-temperature region, achieving a heat reversal effect.

[0055] For example, the second heat exchanger is an evaporator, and the third heat exchanger is a condenser. By controlling the second multi-way valve to a specific open state, the compressor, evaporator, and condenser can execute a positive Carnot cycle. For instance, a low-temperature, low-pressure refrigerant liquid (such as a heat transfer medium) evaporates in the evaporator, absorbing heat and becoming a low-temperature, low-pressure refrigerant gas. This low-temperature, low-pressure refrigerant gas is compressed by the compressor, becoming a high-temperature, high-pressure refrigerant gas. This high-temperature, high-pressure refrigerant gas condenses in the condenser, releasing heat and becoming a high-temperature, high-pressure refrigerant liquid. This high-temperature, high-pressure refrigerant liquid passes through a throttling device (such as an expansion valve), its pressure and temperature decrease, returning to a low-temperature, low-pressure state, and enters the evaporator to begin a new cycle. Correspondingly, by controlling the second multi-way valve to another specific open state, the compressor, evaporator, and condenser can execute a reverse Carnot cycle.

[0056] In some alternative embodiments, where a second multi-way valve is included in the compression circuit, the compression circuit and the converter circuit can be coupled via a third heat exchanger.

[0057] In some optional embodiments, the second multi-way valve is a four-way valve, the second heat exchanger is an evaporator, and the third heat exchanger is a condenser; and the first and second valves of the second multi-way valve are respectively connected to the two ends of the compressor, the third and fourth valves of the second multi-way valve are respectively connected to the second and third heat exchangers, and the second and third heat exchangers are connected to each other.

[0058] Based on the above connection method of the second multi-way valve, by controlling the conduction state of the second multi-way valve, the flow direction of the hot medium in the compression circuit can be controlled to execute a positive Carnot cycle or a reverse Carnot cycle.

[0059] In some optional embodiments, the control unit is further configured to control the second multi-way valve to a third open state so that the compressor, the second heat exchanger, and the third heat exchanger perform a positive Carnot cycle; and the control unit is further configured to control the second multi-way valve to a fourth open state so that the compressor, the second heat exchanger, and the third heat exchanger perform a reverse Carnot cycle; wherein, the third open state means that the first valve and the third valve of the second multi-way valve are connected, and the second valve and the fourth valve are also connected, and the fourth open state means that the first valve and the fourth valve of the second multi-way valve are connected, and the second valve and the third valve are also connected.

[0060] Figure 3 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 3 The energy storage thermal management system includes: a converter circuit 10, a battery pack circuit 20, a compression circuit 30, and a control unit. The converter circuit 10 includes an energy storage converter 110, a first heat exchanger 210, and a first water pump 810. The battery pack circuit 20 includes a battery pack 310, a first heat exchanger 210, a second heat exchanger 220, a first multi-way valve 410, a heating unit 510, and a second water pump 820. The compression circuit 30 includes a compressor 610, a second heat exchanger 220, a third heat exchanger 230, a second multi-way valve 420, and an expansion valve 910. A water tank 710 is used to store the heat medium flowing in the pipelines of the energy storage thermal management system.

[0061] Furthermore, such as Figure 3 As shown, the inverter circuit 10 and the battery pack circuit 20 are coupled through a first heat exchanger 210, the battery pack circuit 20 and the compression circuit 30 are coupled through a second heat exchanger 220, and the inverter circuit 10 and the compression circuit 30 are coupled through a third heat exchanger 230. The compression circuit 30 can perform either a positive Carnot cycle or a reverse Carnot cycle. Among these, the... Figure 2Similarly, the inverter circuit 10 and the battery circuit 20 can be mixed at the first heat exchanger 210, the battery circuit 20 and the compression circuit 30 can exchange heat at the second heat exchanger 220, and the inverter circuit 10 and the compression circuit 30 can exchange heat at the third heat exchanger 230. The heat exchange method at the second heat exchanger 220 and the heat exchange method at the third heat exchanger 230 are related to the type of heat exchanger. For example, if the second heat exchanger 220 is an evaporator, the evaporator can absorb heat by changing the phase change of the refrigerant inside it (such as from liquid to gas), thereby cooling the heat medium in the battery circuit.

[0062] The first multi-way valve 410 is a three-way valve, and its connection relationship can be found in [reference needed]. Figure 2 The relevant descriptions will not be elaborated here. The second multi-way valve 420 is a four-way valve, including a first valve 421, a second valve 422, a third valve 423, and a fourth valve 424. Furthermore, the first valve 421 and the second valve 422 of the second multi-way valve 420 are respectively connected to the two ends of the compressor 610, the third valve 423 of the second multi-way valve 420 is connected to one end of the second heat exchanger 220, and the fourth valve 424 of the second multi-way valve 420 is connected to the third heat exchanger 230. The third heat exchanger is connected to the other end of the second heat exchanger 220 via an expansion valve 910.

[0063] Furthermore, if the second multi-way valve 420 is controlled in the third conducting state, that is, the first valve 421 and the third valve 423 of the second multi-way valve 420 are connected, and the second valve 422 and the fourth valve 424 are also connected, then the compressor 610, the second heat exchanger 220 and the third heat exchanger 230 can perform a positive Carnot cycle; if the second multi-way valve 420 is controlled in the fourth conducting state, that is, the first valve 421 and the fourth valve 424 of the second multi-way valve 420 are connected, and the second valve 422 and the third valve 423 are also connected, then the compressor 610, the second heat exchanger 220 and the third heat exchanger 230 can perform a reverse Carnot cycle.

[0064] In some alternative embodiments, the converter circuit and the battery pack circuit can be coupled through the target pipe by bridging the outlet end of the first heat exchanger between the two valves of the first multi-way valve.

[0065] In some optional embodiments, one end of the target pipe near the outlet of the first heat exchanger is connected to the first valve of the first multi-way valve, and the other end of the target pipe is connected to the second valve of the second multi-way valve. The second and third valves of the first multi-way valve are also connected to the second heat exchanger and the battery pack, respectively, and the second heat exchanger is connected to the battery pack.

[0066] Figure 4This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 4 The energy storage thermal management system includes: a converter circuit 10, a battery pack circuit 20, a compression circuit 30, and a control unit. The converter circuit 10 includes an energy storage converter 110, a first heat exchanger 210, and a first water pump 810. The battery pack circuit 20 includes a battery pack 310, a first heat exchanger 210, a second heat exchanger 220, a first multi-way valve 410, a heating unit 510, and a second water pump 820. The compression circuit 30 includes a compressor 610, a second heat exchanger 220, a third heat exchanger 230, a second multi-way valve 420, and an expansion valve 910. A water tank 710 is used to store the heat medium flowing in the pipelines of the energy storage thermal management system.

[0067] Furthermore, such as Figure 4 As shown, the first multi-way valve 410 is a three-way proportional valve, including a first valve 411, a second valve 412, and a third valve 413. By controlling the opening degree of each valve, the flow ratio of the heat medium through each valve can be controlled. Further, one end of the target pipeline 1010 near the outlet end of the first heat exchanger 210 is connected to the first valve 411 of the first multi-way valve 410, and the other end of the target pipeline 1010 is connected to the second valve 412 of the first multi-way valve 410. The second valve 412 of the first multi-way valve 410 is connected to the second heat exchanger 220 through a second water pump 820 and a heating unit 510 connected in series. The other end of the second heat exchanger 220 is connected to the third valve 413 of the first multi-way valve 410 through a battery pack 310.

[0068] Therefore, by connecting the target pipe 1010 across the two valves of the first multi-way valve 410, the inverter circuit 10 and the battery pack circuit 20 are connected in parallel through the target pipe 1010. This allows thermal coupling between the inverter circuit 10 and the battery pack circuit 20 via the target pipe, while coupling between the battery pack circuit 20 and the compression circuit 30 can be achieved through the second heat exchanger 220. In other words, the inverter circuit 10 and the battery pack circuit 20 can mix at the target pipe. The degree of mixing can be adjusted by controlling the opening degree of each valve of the first multi-way valve 410. The mixing method can be found in the relevant description of the embodiments of this disclosure.

[0069] In summary, the battery pack circuit and the inverter circuit in this embodiment can operate independently and have voltage regulation function, thereby supporting long-term operation and improving system stability.

[0070] In some optional embodiments, the control unit is further configured to control the first multi-way valve to be in a first open state, so as to select the battery pack and the second heat exchanger to form a first battery pack sub-loop. The first open state means that the first valve of the first multi-way valve is in a closed state, and the second and third valves are connected.

[0071] Figure 5 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure, and its connection relationship is... Figure 2 The energy storage thermal management system shown is the same. (Refer to...) Figure 5 If the first multi-way valve 410 is in the first conducting state, then the first valve 411 of the first multi-way valve is closed, and the heat medium cannot flow out or in from the first valve 411. The second valve 412 and the third valve 413 are connected, allowing the heat medium to flow. Based on this, a small loop can be formed by the battery pack 310, the second heat exchanger 220, the heating unit 510, and the second water pump 820 connected in series. This loop is the first battery sub-loop. Figure 5 Small loops connected by thickened lines. Figure 3 and Figure 4 The corresponding first battery sub-circuit is similar and will not be described in detail here.

[0072] In some optional embodiments, when the inlet and outlet ends of the first heat exchanger are connected between the two valves of the first multi-way valve, the control unit is further configured to control the first multi-way valve to be in a second open state to select the battery pack, the first heat exchanger and the second heat exchanger to form a second battery pack sub-loop; and the control unit is further configured to select the energy storage converter and the first heat exchanger to form a first converter sub-loop, or to select the energy storage converter, the first heat exchanger and the third heat exchanger to form a second converter sub-loop, wherein the second converter sub-loop is coupled to the compression loop through the third heat exchanger.

[0073] In some optional embodiments, when the target pipeline is connected between the two valves of the first multi-way valve, the control unit is also used to control the first multi-way valve to be in a second open state, so as to select the battery pack, the target pipeline and the second heat exchanger to form a third battery pack sub-loop, and select the energy storage converter, the first heat exchanger and the target pipeline to form a third converter sub-loop.

[0074] Wherein, when the first multi-way valve is a three-way valve, the second conduction state means that the second valve of the first multi-way valve is in a closed state and the first valve and the third valve are connected; when the first multi-way valve is a three-way proportional valve, the second conduction state includes that the second valve of the first multi-way valve is in a closed state and the first valve and the third valve are connected, or, the three valves of the first multi-way valve control the flow of each valve based on three preset flow split ratios corresponding to the three valves, and any preset flow split ratio is greater than zero.

[0075] Figure 6 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure, and its connection relationship is... Figure 2 Same. (Refer to...) Figure 6 When the first multi-way valve 410 is in the second open state, the second valve 412 of the first multi-way valve 410 is in the closed state, and the first valve 411 and the third valve 413 are connected. Based on this, after the heat medium flows out of the water tank 710, it flows sequentially through the heating unit 510, the second heat exchanger 220, and the battery pack 310 under the action of the second water pump 820. Then, it enters the first heat exchanger 210 through the connecting pipe between the first valve 411 and the third valve 413, thus forming a circulating loop. This loop is the second battery pack sub-loop. Figure 6 The loop is based on the connection of the thickened line. Figure 3 The second battery pack sub-circuit of the energy storage thermal management system shown is similar and will not be described further here.

[0076] Figure 7 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure, and its connection relationship is... Figure 2 Same. (Refer to...) Figure 7 After the heat medium flows out of the water tank 710, it flows sequentially through the energy storage converter 110 and the first heat exchanger 210 under the action of the first water pump 810, thus forming a circulating loop. This loop is the first converter sub-loop, corresponding to... Figure 7 The loop is based on the connection of the thickened line.

[0077] Figure 8 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure, and its connection relationship is... Figure 3 Same. (Refer to...) Figure 8 After the heat medium flows out of the water tank 710, it flows sequentially through the energy storage converter 110, the third heat exchanger 230, and the first heat exchanger 210 under the action of the first water pump 810, thus forming a circulating loop. This loop is the second converter sub-loop, corresponding to... Figure 8 The circuit is based on a thickened line connection. Furthermore, the second converter sub-circuit and the compression circuit can be thermally coupled via a third heat exchanger 230.

[0078] Furthermore, comparison Figure 7 and Figure 8 It can be seen that the main difference between the first converter sub-loop and the second converter sub-loop lies in whether or not a third heat exchanger 230 is included.

[0079] Figure 9 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure, and its connection relationship is... Figure 4 Same. (Refer to...) Figure 9When the first multi-way valve 410 is in the second conducting state, the second valve 412 of the first multi-way valve 410 is in the closed state, and the first valve 411 and the third valve 413 are connected. Based on this, after the heat medium flows out of the water tank 710, it flows sequentially through the heating unit 510, the second heat exchanger 220, and the battery pack 310 under the action of the second water pump 820, and then enters the target pipe 1010 through the connecting pipe between the first valve 411 and the third valve 413, thus forming a circulating loop. This loop is the third battery pack sub-loop. Figure 9 The loop is based on the connection of the thickened line.

[0080] It should be noted that, since the first multi-way valve 410 is a three-way proportional valve, in some optional embodiments, the first multi-way valve 410 being in the second conducting state also includes: the three valves of the three-way proportional valve can divide the heat medium among the three valves according to the corresponding preset flow division ratio. Therefore, the second valve of the first multi-way valve 410 is also conducting to a certain extent, so that the heat medium can flow out from the second valve. In this case, compared to its corresponding third battery pack sub-circuit... Figure 9 For the third battery pack sub-circuit shown, an additional branch pipe has been added, which corresponds to the section of pipe between the second valve 412 of the first multi-way valve 410 and the second water pump 820.

[0081] Figure 10 This is a schematic diagram of an energy storage thermal management system provided in an embodiment of this disclosure, and its connection relationship is... Figure 4 Same. (Refer to...) Figure 10 After the heat medium flows out of the water tank 710, it flows sequentially through the energy storage converter 110, the first heat exchanger 210, and the target pipeline 1010 under the action of the first water pump 810, thus forming a circulating loop. This loop is the third converter sub-loop, corresponding to... Figure 10 The loop is based on the connection of the thickened line.

[0082] In summary, Figure 3 A second multi-way valve is installed in the compression circuit, allowing the compression circuit to execute either a forward Carnot cycle or a reverse Carnot cycle as needed. The reverse Carnot cycle essentially gives the compression circuit a heat pump function. In contrast... Figure 2 and Figure 4 The compression circuit does not have a second multi-way valve, so it can only execute the positive Carnot cycle and cannot execute the reverse Carnot cycle. Therefore, the compression circuit does not have a heat pump function.

[0083] In other words, the energy storage thermal management system of this disclosure may or may not support a heat pump function. Supporting a heat pump function allows the energy storage thermal management system to utilize both the heating unit and the heat pump function for heating, thus making it more suitable for scenarios where severe cold environments may occur. The absence of a heat pump function simplifies the loop piping to some extent, reduces integration costs, and allows heating by the heating unit alone to meet usage requirements, making it suitable for scenarios where severe cold environments do not occur (or occur very rarely).

[0084] It should be noted that, for Figure 2 and Figure 4 The third heat exchanger in the compression circuit can be a condenser, which is equivalent to a water-to-water heat exchanger, for... Figure 3 In the compression loop, the third heat exchanger can be a water-air heat exchanger. The main reason for choosing the type of the third heat exchanger is that if a water-to-water heat exchanger is still used as the third heat exchanger when the compression loop does not have a heat pump function, the first heat exchanger in the converter loop (such as a water-air heat exchanger) may bear a large heat dissipation pressure, thus affecting the operating performance of the energy storage converter. Therefore, a water-air heat exchanger is chosen as the third heat exchanger.

[0085] Furthermore, through comparison Figure 2 and Figure 4 It can be seen that the main differences between the two, besides the connection relationship of the first heat exchanger, also include... Figure 2 The first multi-way valve in the system is a three-way valve. Figure 4 The first multi-way valve in the system is a three-way proportional valve. This configuration is used for... Figure 4 In the energy storage thermal management system shown, the converter circuit and the battery pack circuit no longer mix at the first heat exchanger. That is, the cold water part of the battery pack circuit (i.e., the heat medium that has not absorbed heat) does not flow through the first heat exchanger in the converter circuit, but mixes with the heat medium in the converter circuit that has been cooled by the first heat exchanger.

[0086] In some optional embodiments, the control unit is further configured to: control the energy storage thermal management system to enter a heating mode when the temperature of the battery pack in the energy storage thermal management system is lower than a preset battery temperature threshold; control the energy storage thermal management system to enter a compression cooling mode when the temperature of the battery pack is greater than or equal to the preset battery temperature threshold and the ambient temperature is greater than or equal to a first ambient temperature threshold; control the energy storage thermal management system to enter an air-cooling mode when the temperature of the battery pack is greater than or equal to the preset battery temperature threshold and the ambient temperature is less than the first ambient temperature threshold but greater than a second ambient temperature threshold; and control the energy storage thermal management system to enter a waste heat utilization mode when the temperature of the battery pack is greater than or equal to the preset battery temperature threshold and the ambient temperature is less than or equal to the second ambient temperature threshold. Wherein, the first ambient temperature threshold is greater than the second ambient temperature threshold.

[0087] In some optional embodiments, the heating mode includes two implementation methods: the first implementation method is to use a heating unit for heating treatment, and the second implementation method is to use a heating unit and a reverse Carnot cycle of the compression circuit for heating treatment together.

[0088] Figure 11 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 11 Its corresponding Figure 2 The energy storage thermal management system is shown. When the temperature of the battery pack in the energy storage thermal management system is lower than a preset battery temperature threshold (e.g., 5 degrees Celsius), to prevent the normal operation of the battery pack from being affected by excessively low temperatures, the energy storage thermal management system is controlled to enter a heating mode. After entering the heating mode, the first multi-way valve 410 is adjusted to the first conducting state, allowing the heat transfer medium to flow in the first battery pack sub-circuit (the direction of heat transfer medium flow is as follows). Figure 11 (As indicated by the middle arrow), and the heating unit 510 heats the thermal medium therein, thereby increasing the temperature of the battery pack.

[0089] Figure 4 The heating mode of the energy storage thermal management system shown is the same as Figure 11 The same applies as shown, so it will not be described further here.

[0090] Figure 12 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 12 Its corresponding Figure 3 The energy storage thermal management system is shown. When the temperature of the battery pack in the energy storage thermal management system is lower than a preset battery temperature threshold, to prevent the normal operation of the battery pack from being affected by excessively low temperatures, the energy storage thermal management system is controlled to enter a heating mode. After entering the heating mode, on the one hand, the first multi-way valve 410 is adjusted to the first conducting state, allowing the heat medium to flow in the first battery pack sub-circuit, and the heating unit 510 heats the heat medium therein; on the other hand, the second multi-way valve 420 is adjusted to the fourth conducting state, causing the compression circuit to execute a reverse Carnot cycle (the heat medium flows in the direction shown in the image). Figure 12 (As indicated by the middle arrow), the heat medium in the first battery pack sub-circuit is also heated through the second heat exchanger 220, thereby increasing the temperature of the battery pack.

[0091] In some optional embodiments, if the temperature of the battery pack is greater than or equal to a preset battery temperature threshold, it means that the battery pack temperature will not cause operational problems due to excessively low temperature. Furthermore, if the ambient temperature is greater than or equal to a first ambient temperature threshold (e.g., 15 degrees Celsius), it means that the ambient temperature is high at this time, and it is necessary to control the energy storage thermal management system to enter the compression cooling mode to reduce the temperature and avoid system malfunctions due to high temperature.

[0092] Figure 13 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 13 Its corresponding Figure 2 The energy storage thermal management system is shown. When the temperature of the battery pack in the energy storage thermal management system is greater than or equal to a preset battery temperature threshold, and the ambient temperature is greater than or equal to a first ambient temperature threshold, to prevent the system from being affected by excessively high temperatures, the energy storage thermal management system is controlled to enter a compression cooling mode. After entering the compression cooling mode, the first multi-way valve 410 is adjusted to the first conducting state, allowing the heat medium to flow in the first battery pack sub-loop. The compression loop starts a positive Carnot cycle through the compressor, and the heat medium in the first battery pack sub-loop is cooled based on the second heat exchanger 220. At the same time, the heat medium circulates in the first converter sub-loop and is cooled by the first heat exchanger 210.

[0093] Figure 14 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 14 Its corresponding Figure 3 The energy storage thermal management system is shown. When the temperature of the battery pack in the energy storage thermal management system is greater than or equal to a preset battery temperature threshold, and the ambient temperature is greater than or equal to a first ambient temperature threshold, to prevent the system from being affected by excessively high temperatures, the energy storage thermal management system is controlled to enter a compression cooling mode. After entering the compression cooling mode, on the one hand, the first multi-way valve 410 is adjusted to the first conducting state, so that the heat medium flows in the first battery pack sub-circuit; on the other hand, the second multi-way valve 420 is adjusted to the third conducting state, so that the compression circuit executes a Carnot cycle (the heat medium flows in the direction shown in the image). Figure 15 (As indicated by the middle arrow), the heat medium in the first battery pack sub-circuit is cooled by the second heat exchanger 220, thereby reducing the temperature of the battery pack 310; in addition, the heat medium circulates in the second converter sub-circuit and is cooled by the first heat exchanger 210.

[0094] Figure 15 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 15 Its corresponding Figure 4 The energy storage thermal management system is shown. When the temperature of the battery pack in the energy storage thermal management system is greater than or equal to a preset battery temperature threshold, and the ambient temperature is greater than or equal to a first ambient temperature threshold, the energy storage thermal management system is controlled to enter compression cooling mode to prevent the system from being affected by excessively high temperatures.

[0095] Upon entering the compression refrigeration mode, the three valves of the first multi-way valve (three-way proportional valve) control the flow rate of each valve based on three corresponding preset flow split ratios (any preset flow split ratio is greater than zero). This causes a portion of the heat medium in the third battery pack sub-circuit to mix with the cooling heat medium in the third converter sub-circuit at the target pipe 1010. After flowing out of the target pipe 1010, the flow is split, returning to the third battery pack sub-circuit and the third converter sub-circuit respectively. Furthermore, the heat medium returning to the third battery pack sub-circuit merges with the heat medium flowing out from the second valve 412 of the first multi-way valve 410 and enters the second water pump 820, thus achieving cooling through repeated cycles.

[0096] Therefore, by mixing the cooling heat medium in the third converter sub-circuit with a portion of the heat medium in the third battery pack sub-circuit at the target pipe, the temperature of the heat medium in the third battery pack sub-circuit can be further reduced, causing the inlet water temperature of the heat medium in the third battery pack sub-circuit to drop to a level close to or lower than the ambient temperature. The temperature reduction achieved by the mixing process in the third battery pack sub-circuit can be controlled according to the conduction ratio of each valve in the first multi-way valve 410.

[0097] It should be noted that, compared to Figure 2 The energy storage thermal management system shown is Figure 4 The energy storage thermal management system shown adjusts the mixing position of the inverter circuit and the battery pack circuit, so that the first heat exchanger only needs to handle the heat dissipation needs of the inverter circuit itself, which is beneficial to improving the performance of the energy storage inverter. In addition, because the battery pack circuit can mix with the partially cooled heat medium of the inverter circuit, which has a lower temperature, the inlet water temperature of the inverter circuit can be reduced to a level close to or lower than the ambient temperature. This makes it suitable for high ambient temperature environments, increases the system's high temperature limit, and improves the system's performance and stability in high-temperature environments.

[0098] In some optional embodiments, when the battery pack temperature is greater than or equal to the preset battery temperature threshold, if the ambient temperature is low (e.g., less than 15 degrees Celsius), the energy storage thermal management system can be controlled to enter air-cooling mode; if the ambient temperature further decreases (e.g., less than -5 degrees Celsius), the energy storage thermal management system can be controlled to enter waste heat utilization mode. Here, waste heat utilization mode mainly refers to the temperature control mode where the battery pack circuit utilizes the waste heat from the inverter circuit.

[0099] Figure 16 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 16 Its corresponding Figure 2 The energy storage thermal management system shown is an example. Figure 16As shown, after entering the air-cooled mode, the first multi-way valve 410 is controlled to be in the second conducting state. On one hand, the heat transfer medium flows in the second battery pack sub-circuit; on the other hand, the heat transfer medium flows in the first converter sub-circuit. The two sub-circuits share the heat dissipation through the first heat exchanger 210; the compression circuit is in an idle state. In other words, the first heat exchanger 210 needs to simultaneously handle the heat dissipation requirements of both the second battery pack sub-circuit and the first converter sub-circuit. Since the ambient temperature at this time is lower than the first ambient temperature threshold, the current heat dissipation requirement can be met by the first heat exchanger 210.

[0100] Furthermore, when the ambient temperature further decreases to less than or equal to the second ambient temperature threshold, the energy storage thermal management system enters air-cooling mode. The first multi-way valve 410 remains in the second conducting state, and the flow path and direction of the heat medium are the same as those of the second conducting state. Figure 17 The design is the same as shown, except that the operating parameters of the first heat exchanger 210 can be adjusted to reduce its heat dissipation capacity, so that the inside of the energy storage converter cabinet is at a higher temperature when charging and discharging are completed, thus delaying the natural cooling time of the cabinet and utilizing this residual heat to increase the temperature of the battery pack circuit. For example, if the first heat exchanger 210 is a water-air heat exchanger, its heat dissipation capacity can be reduced by decreasing its fan speed.

[0101] Figure 17 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 17 Its corresponding Figure 3 The energy storage thermal management system shown is an example. Figure 17 As shown, after entering the air-cooled mode, the first multi-way valve 410 is controlled to be in the second conducting state. On the one hand, the heat transfer medium flows in the second battery pack sub-circuit; on the other hand, the heat transfer medium flows in the second converter sub-circuit; the compression circuit is in an idle state. Since the compression circuit is not working, the second converter sub-circuit is essentially the same as the first converter sub-circuit at this time. Therefore, the first heat exchanger 210 still simultaneously undertakes the heat dissipation requirements of both the second battery pack sub-circuit and the second converter sub-circuit.

[0102] Furthermore, when the ambient temperature further decreases to less than or equal to the second ambient temperature threshold, the energy storage thermal management system enters air-cooling mode. The first multi-way valve 410 remains in the second conducting state, and the flow path and direction of the heat medium are the same as those of the second conducting state. Figure 18 The same as shown, the only difference is that the operating parameters of the first heat exchanger 210 can be adjusted to reduce its heat dissipation capacity, so that the inside of the energy storage converter cabinet is at a higher temperature when charging and discharging are completed, thus delaying the natural cooling time of the cabinet and using this residual heat to increase the temperature of the battery pack circuit.

[0103] Figure 18 This is a schematic diagram illustrating the working process of an energy storage thermal management system provided in an embodiment of this disclosure. (Refer to...) Figure 18 Its corresponding Figure 4 The energy storage thermal management system shown is an example. Figure 18 As shown, after entering the air-cooled mode, the first multi-way valve 410 (three-way proportional valve) is in the second conducting state, with its first valve 411 and third valve 413 fully open and the second valve 412 closed. The heat medium flows in the third battery pack sub-circuit and simultaneously in the third converter sub-circuit; the compression circuit is in an idle state. The third converter sub-circuit dissipates heat through the first heat exchanger 210. The cooled heat medium mixes with the heat medium in the third battery pack sub-circuit at the target pipe, thereby reducing the temperature of the heat medium flowing out of the third battery pack sub-circuit. The heat medium flowing out of the target pipe is then diverted, flowing back to the third converter sub-circuit and the third battery pack sub-circuit respectively.

[0104] Furthermore, when the ambient temperature further decreases to less than or equal to the second ambient temperature threshold, the energy storage thermal management system enters air-cooling mode. The first multi-way valve 410 remains in the second conducting state, and the flow path and direction of the heat medium are the same as those of the second conducting state. Figure 18 The same as shown, the only difference is that the operating parameters of the first heat exchanger 210 can be adjusted to reduce its heat dissipation capacity, so that the inside of the energy storage converter cabinet is at a higher temperature when charging and discharging are completed, thus delaying the natural cooling time of the cabinet and using this residual heat to increase the temperature of the battery pack circuit.

[0105] In summary, in the embodiments of this disclosure, the energy storage thermal management system can be controlled to enter heating mode, compression cooling mode, air cooling mode, or waste heat utilization mode according to different battery temperatures and ambient temperatures, thereby meeting temperature control requirements and improving system operational stability.

[0106] It is understood that the various embodiments mentioned above in this application can be combined with each other to form combined embodiments without violating the principle and logic. Due to space limitations, this application will not elaborate further.

[0107] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for general illustrative purposes only and should not be construed as limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this application as set forth by the appended claims.

Claims

1. An energy storage thermal management system, characterized in that, include: Inverter circuit, battery pack circuit, compressor circuit, and control unit; The converter circuit includes at least one energy storage converter and a first heat exchanger; the battery pack circuit includes at least one battery pack, a second heat exchanger, a first multi-way valve and a heating unit; the compression circuit includes a compressor, a second heat exchanger and a third heat exchanger, and the battery pack circuit and the compression circuit are coupled through the second heat exchanger. The control unit is used to control the connection relationship between the first heat exchanger and the first multi-way valve, as well as the conduction state of the first multi-way valve, so that the converter circuit and the battery pack circuit can be coupled by selecting the first heat exchanger or the pipeline.

2. The system according to claim 1, characterized in that, The control unit is used to control the inlet and outlet ends of the first heat exchanger to be connected across the two valves of the first multi-way valve, so that the converter circuit and the battery pack circuit are coupled through the first heat exchanger. Alternatively, the control unit is used to control the target pipe connected to the outlet end of the first heat exchanger to be connected across the two valves of the first multi-way valve, so that the converter circuit and the battery pack circuit are coupled through the target pipe.

3. The system according to claim 2, characterized in that, The control unit is also used to control the first multi-way valve to be in a first conducting state, so as to select the battery pack and the second heat exchanger to form a first battery pack sub-circuit; When the inlet and outlet ends of the first heat exchanger are connected between the two valves of the first multi-way valve, the control unit is further configured to control the first multi-way valve to be in a second conducting state, so as to select the battery pack, the first heat exchanger and the second heat exchanger to form a second battery pack sub-loop; and the control unit is further configured to select the energy storage converter and the first heat exchanger to form a first converter sub-loop, or to select the energy storage converter, the first heat exchanger and the third heat exchanger to form a second converter sub-loop, wherein the second converter sub-loop is coupled to the compression loop through the third heat exchanger; When the target pipeline is connected between the two valves of the first multi-way valve, the control unit is also used to control the first multi-way valve to be in a second open state, so as to select the battery pack, the target pipeline and the second heat exchanger to form a third battery pack sub-loop, and select the energy storage converter, the first heat exchanger and the target pipeline to form a third converter sub-loop.

4. The system according to claim 3, characterized in that, The first battery pack sub-circuit and the compression circuit exchange heat through the second heat exchanger. The second battery pack sub-circuit and the first inverter sub-circuit exchange heat through the first heat exchanger, or the second battery pack sub-circuit and the second inverter sub-circuit exchange heat through the first heat exchanger. The third battery pack sub-circuit and the third converter sub-circuit undergo heat exchange by mixing a heat transfer medium in the target pipeline.

5. The system according to claim 3, characterized in that, The first multi-way valve is a three-way valve or a three-way proportional valve; The inlet and outlet ends of the first heat exchanger are respectively connected to the first valve and the second valve of the first multi-way valve. The second valve and the third valve of the first multi-way valve are also respectively connected to the second heat exchanger and the battery pack, and the second heat exchanger is connected to the battery pack. Alternatively, one end of the target pipe near the outlet of the first heat exchanger is connected to the first valve of the first multi-way valve, and the other end of the target pipe is connected to the second valve of the second multi-way valve. The second and third valves of the first multi-way valve are also connected to the second heat exchanger and the battery pack, respectively, and the second heat exchanger is connected to the battery pack.

6. The system according to claim 5, characterized in that, The first conducting state means that the first valve of the first multi-way valve is in the closed state, and the second valve and the third valve are connected; When the first multi-way valve is a three-way valve, the second conduction state means that the second valve of the first multi-way valve is in the closed state, and the first valve and the third valve are connected. When the first multi-way valve is a three-way proportional valve, the second conduction state includes the second valve of the first multi-way valve being in a closed state and the first valve and the third valve being connected, or the three valves of the first multi-way valve controlling the flow of each valve based on three preset flow split ratios corresponding to the three valves, and any preset flow split ratio being greater than zero.

7. The system according to any one of claims 1-6, characterized in that, The compression circuit also includes a second multi-way valve; The control unit is also used to control the second multi-way valve to cause the compressor, the second heat exchanger and the third heat exchanger to perform a positive Carnot cycle or a reverse Carnot cycle.

8. The system according to claim 7, characterized in that, The second multi-way valve is a four-way valve, the second heat exchanger is an evaporator, and the third heat exchanger is a condenser; The first and second valves of the second multi-way valve are respectively connected to the two ends of the compressor, and the third and fourth valves of the second multi-way valve are respectively connected to the second heat exchanger and the third heat exchanger, and the second heat exchanger and the third heat exchanger are connected to each other.

9. The system according to claim 8, characterized in that, The control unit is further configured to control the second multi-way valve to a third open state, so that the compressor, the second heat exchanger and the third heat exchanger perform a positive Carnot cycle; and the control unit is further configured to control the second multi-way valve to a fourth open state, so that the compressor, the second heat exchanger and the third heat exchanger perform a reverse Carnot cycle; The third conduction state refers to the connection between the first and third valves of the second multi-way valve, and the connection between the second and fourth valves. The fourth conduction state refers to the connection between the first and fourth valves of the second multi-way valve, and the connection between the second and third valves.

10. The system according to any one of claims 1-6, characterized in that, The control unit is also used for: When the temperature of the battery pack in the energy storage thermal management system is lower than a preset battery temperature threshold, the energy storage thermal management system is controlled to enter a heating mode. When the temperature of the battery pack is greater than or equal to the preset battery temperature threshold and the ambient temperature is greater than or equal to the first ambient temperature threshold, the energy storage thermal management system is controlled to enter the heating mode. When the temperature of the battery pack is greater than or equal to the preset battery temperature threshold, and the ambient temperature is less than the first ambient temperature threshold and greater than the second ambient temperature threshold, the energy storage thermal management system is controlled to enter the air-cooling mode. When the temperature of the battery pack is greater than or equal to the preset battery temperature threshold and the ambient temperature is less than or equal to the second ambient temperature threshold, the energy storage thermal management system is controlled to enter the waste heat utilization mode.

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