Energy storage system

Abstract

The embodiment of the invention discloses an energy storage system. The energy storage system comprises a temperature adjusting module, a power conversion module and a battery cluster, wherein the plurality of power conversion modules are respectively arranged on a plurality of first branches, and the first ends of the power conversion modules are connected with the temperature adjusting module; the multiple battery clusters are arranged on the multiple first branches respectively, the first ends of the battery clusters are connected with the second end of the power conversion module, and the second ends of the battery clusters are connected with the temperature adjusting module. According to the energy storage system provided by the invention, the power conversion module and the battery cluster are arranged on the same branch, so that the system architecture of the energy storage system can be simplified; besides, the temperature of the power conversion module and the temperature of the battery cluster are controlled at the same time, the uncontrollability that the power conversion module dissipates heat through the environment is eliminated, and the cooling efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of battery systems, and particularly to an energy storage system. Background Art

[0002] In traditional energy storage systems, battery clusters are cooled by compressors, while power conversion modules dissipate heat to the environment through components such as heat exchangers. It can be seen that traditional energy storage systems require two sets of cooling systems to be designed, that is, the current energy storage systems are relatively complex. Summary of the Invention

[0003] Embodiments of this application provide an energy storage system, which can simplify the system structure of the energy storage system and improve the cooling efficiency.

[0004] Embodiments of this application provide an energy storage system, including

[0005] a temperature regulation module;

[0006] a power conversion module, a plurality of the power conversion modules are respectively arranged on a plurality of first branches, and a first end of the power conversion module is connected to the temperature regulation module;

[0007] a battery cluster, a plurality of the battery clusters are respectively arranged on a plurality of first branches, a first end of the battery cluster is connected to a second end of the power conversion module, a second end of the battery cluster is connected to the temperature regulation module, and the battery cluster and the corresponding power conversion module are connected in series through the same first branch, and all the first branches are connected in parallel and then connected to the temperature regulation module through a second branch to form a loop.

[0008] Optionally, in some embodiments of this application, the temperature regulation module includes a cooling component, a heat exchange component, and a heating component;

[0009] Wherein, the liquid flowing through the cooling component exchanges heat with the liquid flowing through the heating component through the heat exchange component, a first end of the power conversion module is connected to the heating component, and a second end of the battery cluster is connected to the heating component.

[0010] Optionally, in some embodiments of this application, the heating component includes a circulation pump and a heater;

[0011] Wherein, a first end of the circulation pump is connected to the power conversion module, a second end of the circulation pump is connected to a first end of the heat exchange component, a first end of the heater is connected to the first end of the heat exchange component, and a second end of the heater is connected to a second end of the battery cluster.

[0012] Optionally, in some embodiments of this application, the cooling component includes a compressor, a condenser, and an expansion valve;

[0013] Wherein, the first end of the compressor is connected to the heat exchange component, the second end of the compressor is connected to the first end of the expansion valve through the condenser, and the second end of the expansion valve is connected to the heat exchange component.

[0014] Optionally, in some embodiments of the present application, when cooling the battery cluster, the compressor compresses the refrigerant, and the compressed gaseous refrigerant is condensed into a liquid refrigerant through the condenser. The liquid refrigerant exchanges heat with the coolant flowing through the battery cluster in the heat exchange component.

[0015] Optionally, in some embodiments of the present application, when the temperature is less than a preset value, the coolant is heated by the heater so that the heated coolant flows through the battery cluster to heat the battery cells in the battery cluster.

[0016] Optionally, in some embodiments of the present application, when the battery cells in the battery cluster are charging and discharging, the heater is turned off, and the temperature of the power conversion module is used to heat the coolant so that the heated coolant flows through the battery cluster to heat the battery cells in the battery cluster.

[0017] Optionally, in some embodiments of the present application, the power conversion module includes a power conversion unit and a proportional valve;

[0018] Wherein, the first end of the power conversion unit and the first end of the proportional valve are connected to a first node, the second end of the power conversion unit and the second end of the proportional valve are connected to a second node, and the proportional valve is used to control the flow rate of the coolant flowing through the power conversion unit; the battery cluster is connected to the first node; the temperature adjustment module is connected to the second node.

[0019] Optionally, in some embodiments of the present application, if the flow rate of the coolant flowing through the power conversion unit is adjusted to the maximum, the proportional valve is closed.

[0020] Optionally, in some embodiments of the present application, the battery cluster includes a plurality of parallel-connected battery packs, and each battery pack is respectively arranged on a third branch.

[0021] An embodiment of the present application provides an energy storage system, which includes a temperature regulation module, a power conversion module, and a battery cluster. Among them, a plurality of the power conversion modules are respectively arranged on a plurality of first branches, and a first end of the power conversion module is connected to the temperature regulation module; a plurality of the battery clusters are respectively arranged on a plurality of first branches, and a first end of the battery cluster is connected to a second end of the power conversion module, and a second end of the battery cluster is connected to the temperature regulation module. In the energy storage system provided by the present application, the power conversion module and the battery cluster are arranged on the same branch, which can simplify the system architecture of the energy storage system. In addition, for the power conversion module and the battery cluster, temperature control of the power conversion module and the battery cluster is simultaneously achieved, the uncontrollability of the power conversion module using environmental heat dissipation is eliminated, and the cooling efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 FIG. is a schematic structural diagram of a first implementation manner of the energy storage system provided by the embodiment of the present application;

[0024] Figure 2 FIG. is a schematic structural diagram of a second implementation manner of the energy storage system provided by the embodiment of the present application;

[0025] Figure 3 FIG. is a schematic structural diagram of a third implementation manner of the energy storage system provided by the embodiment of the present application;

[0026] Figure 4 FIG. is a schematic structural diagram of a fourth implementation manner of the energy storage system provided by the embodiment of the present application;

[0027] Figure 5 FIG. is a schematic structural diagram of a fifth implementation manner of the energy storage system provided by the embodiment of the present application;

[0028] Figure 6 FIG. is a schematic structural diagram of a sixth implementation manner of the energy storage system provided by the embodiment of the present application.

[0029] The realization of the purpose of the present application, functional features, and advantages will be further described in conjunction with the embodiments with reference to the drawings. Through the above drawings, the clear embodiments of the present application have been shown, and there will be more detailed descriptions later. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application. Without conflict, the following various embodiments and their technical features can be combined with each other.

[0031] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including that element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined based on their explanations in the specific embodiments or further in combination with the context of the specific embodiments.

[0032] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] In the subsequent description, the use of suffixes such as "module", "component" or "unit" to represent elements is only for the convenience of the description of the present application, and it has no specific meaning in itself. Therefore, "module", "component" or "unit" can be used interchangeably.

[0034] The following will be described in detail respectively. It should be noted that the description order of the following embodiments does not limit the priority order of the embodiments.

[0035] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the energy storage system provided by the embodiment of the present application.

[0036] In this embodiment, an energy storage system 1 is provided, which may specifically include a temperature regulation module 10, a power conversion module 20, and a battery cluster 30. Among them, multiple power conversion modules 20 are respectively arranged on multiple first branches, and the first end of the power conversion module 20 is connected to the temperature regulation module 10. Multiple battery clusters 30 are respectively arranged on multiple first branches, and the first end of the battery cluster 30 is connected to the second end of the power conversion module 20. The second end of the battery cluster 30 is connected to the temperature regulation module 10, and the battery cluster 30 and the corresponding power conversion module 20 are connected in series through the same first branch. After all the first branches are connected in parallel, they are connected to the temperature regulation module 10 through a second branch to form a loop.

[0037] Among them, the temperature regulation module 10 is a component integrating cooling, heating, and heat exchange functions, and is used to control and regulate the temperatures of the battery cluster 30 and the power conversion module 20 in the energy storage system. The power conversion module 20 is responsible for converting electrical energy from one form to another to meet the requirements of the energy storage system 1. Specifically, the power conversion module 20 converts the direct current (DC) provided by the battery cluster 30 (DC power source) into alternating current (AC) for use by the AC power grid or to supply power to AC loads. During the charging process, the power conversion module 20 converts the alternating current from the power grid into direct current for charging the battery cluster 30. The power conversion module 20 can control the input and output power of electrical energy according to the requirements of the energy storage system 1 and the state of the power grid to optimize the system performance and grid interaction. The battery cluster 30 generally refers to a relatively large-scale battery pack formed by series and / or parallel combination of multiple battery cells (or battery cores) in the energy storage system 1. This combination method can provide the required voltage and capacity to meet the requirements of specific applications. The battery cluster 30 is the core energy storage unit of the system, and works together with the power conversion module 20 and the temperature regulation module 10 to achieve the storage, conversion, and temperature management of electrical energy. The battery cluster 30 adopts a modular design, which is convenient for expansion and maintenance. The number of battery cells can be increased or decreased according to the requirements of the system. The battery cluster 30 generates heat during the charge and discharge process, and an effective thermal management system is required to maintain the battery working within an appropriate temperature range to improve performance and lifespan. The battery cluster 30 is connected to the power conversion module 20 and the temperature regulation module 10 through the first branch.

[0038] Optionally, in some embodiments of the present application, please refer to Figure 2 , the temperature regulation module 10 includes a cooling component 101, a heat exchange component 102, and a heating component 103. Heat exchange is carried out between the liquid flowing through the cooling component 101 and the liquid flowing through the heating component 103 through the heat exchange component 102. The first end of the power conversion module 20 is connected to the heating component 101, and the second end of the battery cluster 30 is connected to the heating component 103.

[0039] The cooling component 101 is used to absorb the heat generated by the battery cluster 30 and the power conversion module 20 under high-temperature or room-temperature conditions and dissipate the heat to the environment. The heat exchange component 102 serves as a bridge between the cooling component 101 and the heating component 103 and is used to transfer heat between the coolant and the heating liquid. The heating component 103 heats the coolant in a low-temperature environment to ensure that the battery cluster operates at an appropriate temperature.

[0040] Under high-temperature or room-temperature conditions, the cooling component 101 starts to absorb the heat generated by the battery cluster and the PCS. The coolant flows through the heat exchange component 102, transferring the absorbed heat to the refrigerant, thereby reducing the temperature of the coolant. In a low-temperature environment, the heating component 103 starts to heat the coolant. The heated coolant flows through the heat exchange component 102, transferring the heat to the battery cluster 30 and increasing the temperature of the battery cells. The temperature regulation module 10, through the integrated temperature sensors and control system, monitors the temperatures of the battery cluster 30 and the power conversion module 20 in real time. According to the feedback from the temperature sensors, the control system adjusts the flow rates of the coolant and the heating liquid to maintain the battery cluster 30 and the power conversion module 20 within the optimal operating temperature range.

[0041] Among them, the heat exchange component 102 is a heat exchanger. The heat exchange component 102 allows heat exchange between the coolant and the refrigerant to achieve the purpose of cooling or heating. The heat exchange component 102 can be a plate heat exchanger, a shell-and-tube heat exchanger, a finned-tube heat exchanger, a spiral plate heat exchanger, or a microchannel heat exchanger. The plate heat exchanger consists of a series of metal plates, and the fluid flows between the plates, and heat exchange occurs through the plate walls; the shell-and-tube heat exchanger consists of a shell and internal tube bundles, one fluid flows inside the tubes, and the other fluid flows outside the tubes, and heat exchange occurs through the tube walls; the finned-tube heat exchanger increases the heat exchange area by installing fins outside the tubes to improve the heat exchange efficiency; the spiral plate heat exchanger is formed by rolling two metal plates to form spiral channels, and the two fluids flow in different channels and conduct heat exchange; the microchannel heat exchanger uses micro-sized channels to increase the heat exchange area and improve the heat exchange efficiency, and is suitable for applications that require high-precision temperature control.

[0042] Optionally, in some embodiments of the present application, please refer to Figure 3 , the heating component 103 includes a circulation pump 1031 and a heater 1032. Among them, the first end of the circulation pump 1031 is connected to the power conversion module 20, the second end of the circulation pump 1031 is connected to the first end of the heat exchange component 102, the first end of the heater 1032 is connected to the first end of the heat exchange component 102, and the second end of the heater 1032 is connected to the second end of the battery cluster 30.

[0043] The circulation pump 1031 is responsible for driving the heated coolant to circulate in the system. The first end of the circulation pump 1031 is connected to the power conversion module 20. The circulation pump 1031 can provide the circulating power for the coolant. The heater 1032 heats the power conversion module 20 to ensure its normal operation in low-temperature environments. The second end of the circulation pump 1031 is connected to the first end of the heat exchange component 102. The circulation pump 1031 is also responsible for sending the heated coolant to the heat exchange component 102 for further heat exchange.

[0044] The circulation pump 1031 can be a centrifugal pump, a positive displacement pump, a magnetic drive pump, or an electromagnetic pump. Among them, the centrifugal pump generates centrifugal force through a rotating impeller to drive the fluid flow; positive displacement pumps such as gear pumps or screw pumps move the fluid mechanically, providing a stable flow rate and being unaffected by changes in system pressure; magnetic drive pumps use magnetic drive with no leakage risk and are suitable for applications requiring high safety and reliability; electric pumps are driven by electric motors and are suitable for various industrial and commercial applications.

[0045] The heater 1032 is used to heat the coolant in low-temperature environments. The first end of the heater 1032 is connected to the first end of the heat exchange component 102. Therefore, the heater 1032 receives the unheated coolant from the heat exchange component 102 and heats it. The second end of the heater 1032 is connected to the second end of the battery cluster 30. Therefore, the heated coolant directly flows to the battery cluster to provide heating for the battery and ensure the performance of the battery under low-temperature conditions.

[0046] The heater 1032 can be a PTC heater (positive temperature coefficient heater). A PTC heater is a semiconductor heating element whose resistance increases with temperature rise, enabling automatic temperature control; it can also be an electric heater that directly converts electrical energy into heat energy and heats the coolant through a resistance wire or other electric heating elements; it can also be a heat fluid heater that uses an external heat source (such as steam or hot water) to heat the coolant.

[0047] It should be noted that in some embodiments of the present application, the heater 1032 is a PTC heater. A PTC heater is usually made of semiconductor materials such as ceramics or polymer-based composite materials. When these materials reach a certain temperature, their resistance will increase significantly, thereby limiting the further increase of current and realizing the functions of self-regulation and overheat protection.

[0048] In the energy storage system 1, the PTC heater 1032 is used to heat the coolant in a low-temperature environment to ensure that the battery cells in the battery cluster 30 are maintained at the optimal operating temperature. This helps improve the performance and lifespan of the battery, while ensuring the reliability of the system under low-temperature conditions. The PTC heater drives the heated coolant through the battery cluster via the circulation pump 1031 to heat the battery cells, thereby achieving the heating management of the battery cluster.

[0049] The circulation pump 1031 extracts the coolant from the heat exchange component 102 and sends it to the heater 1032. The heater 1032 heats the coolant and raises its temperature. The heated coolant flows from the heater 1032 to the battery cluster 30 to provide the necessary heat for the battery and increase the battery temperature.

[0050] Optionally, the energy storage system 1 can monitor the temperatures of the battery cluster 30 and the power conversion module 20 through temperature sensors. According to the monitoring results, the energy storage system 1 is controlled to adjust the operating state of the heater 1032 to maintain an appropriate coolant temperature, ensuring that the battery cluster 30 and the power conversion module 20 are within the optimal operating temperature range. By providing heating for the battery cluster 30 and the power conversion module 20, the heating component 103 helps improve the performance of the energy storage system 1 in a low-temperature environment. By ensuring that the battery cluster 30 and the power conversion module 20 operate at an appropriate temperature, the heating component 103 improves the reliability and stability of the entire energy storage system 1.

[0051] Optionally, in some embodiments of the present application, please refer to Figure 4 , the cooling component 101 includes a compressor 1011, a condenser 1012, and an expansion valve 1013. Among them, the first end of the compressor 1011 is connected to the heat exchange component 102, the second end of the compressor 1011 is connected to the first end of the expansion valve 1013 through the condenser 1012, and the second end of the expansion valve 1013 is connected to the heat exchange component 102.

[0052] The compressor 1011 is responsible for compressing the refrigerant, increasing its pressure and temperature. The first end of the compressor 1011 is connected to the heat exchange component 102. In the refrigeration cycle, the condenser is used to condense the high-temperature and high-pressure refrigerant gas discharged from the compressor 1011 into a liquid. The second end of the compressor 1011 is connected to the first end of the expansion valve 1013 through the condenser 1012, sending the high-temperature and high-pressure refrigerant gas into the condenser for condensation. The expansion valve 1013 is used to throttle down the high-pressure liquid refrigerant to make it into a low-pressure liquid, preparing it to enter the heat exchange component 102. The first end of the expansion valve 1013 is connected to the condenser 1012 to receive the high-pressure liquid refrigerant; the second end of the expansion valve 1013 is connected to the heat exchange component 102 to send the low-pressure liquid refrigerant into the heat exchange component 102. The low-pressure refrigerant gas is inhaled and compressed by the compressor 1011, becoming a high-temperature and high-pressure gas. The high-temperature and high-pressure gas flows through the condenser 1012, releasing heat and condensing into a high-pressure liquid refrigerant. The high-pressure liquid refrigerant passes through the expansion valve 1013, and the pressure drops suddenly, becoming a low-pressure liquid refrigerant while absorbing heat. The low-pressure liquid refrigerant evaporates in the heat exchange component 102, absorbing heat, thus achieving a cooling effect. The evaporated low-pressure refrigerant gas is inhaled by the compressor 1011 again to complete the refrigeration cycle.

[0053] The energy storage system 1 monitors the temperatures of the battery cluster 30 and the power conversion module 20 through temperature sensors. According to the monitoring results, the energy storage system 1 adjusts the operating state of the compressor 1011 to maintain an appropriate coolant temperature and ensure that the battery cluster 30 and the power conversion module 20 are within the optimal operating temperature range.

[0054] Optionally, in some embodiments of the present application, when cooling the battery cluster 30, the compressor 1011 compresses the refrigerant, and the compressed gaseous refrigerant is condensed into a liquid refrigerant through the condenser 1012. The liquid refrigerant exchanges heat with the coolant flowing through the battery cluster 30 in the heat exchange component 102. Specifically, the compressor 1011 inhales the low-pressure gaseous refrigerant and compresses it into a high-pressure gaseous refrigerant. The compressed high-pressure gaseous refrigerant enters the condenser 1012, where it releases heat to the surrounding environment or a cooling medium (such as air or water) and condenses into a high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows through the expansion valve 1013, and the pressure drops suddenly, becoming a low-pressure liquid refrigerant. During this process, the temperature of the refrigerant also decreases. The low-pressure liquid refrigerant enters the heat exchange component 102, where it exchanges heat with the coolant flowing through the battery cluster 30. Since the temperature of the refrigerant is lower than that of the coolant, it absorbs the heat of the coolant, reducing the coolant temperature. The coolant that has been cooled by the heat exchange component 102 flows through the battery cluster 30, absorbing the heat generated during the charging and discharging of the battery, thereby reducing the battery temperature. The temperature of the coolant that has absorbed the battery heat rises, and then it flows back to the heat exchange component 102 again to conduct a new round of heat exchange with the refrigerant, completing a cycle.

[0055] It should be noted that the refrigerant in this embodiment is the working medium that completes the refrigeration cycle in the refrigeration system. The refrigerant circulates in the loop composed of components such as the compressor, condenser, and expansion valve. Its main function is to absorb and release heat through phase change (between gaseous and liquid states) to achieve the refrigeration effect. The gaseous refrigerant is compressed into a high-temperature and high-pressure state in the compressor, condensed into a liquid refrigerant in the condenser, then throttled and depressurized through the expansion valve to become a low-temperature and low-pressure liquid refrigerant, and enters the heat exchange component to exchange heat with the coolant. After absorbing the heat of the coolant, it evaporates into a gaseous state again, and so on in a cycle. The refrigerant will show changes in two states, gaseous and liquid, in the system. It is in a high-temperature and high-pressure gaseous state when discharged from the compressor, becomes a high-temperature and high-pressure liquid state after condensation in the condenser, becomes a low-temperature and low-pressure liquid state after throttling through the expansion valve, and evaporates into a low-temperature and low-pressure gaseous state after absorbing heat in the heat exchange component.

[0056] Optionally, in some embodiments of the present application, when the temperature is lower than the preset value, the coolant is heated by the heater 1032 so that the heated coolant flows through the battery cluster 30 to heat the battery cells in the battery cluster 30. When the system monitors that the temperature of the battery cluster 30 is lower than the preset minimum operating temperature, the control unit will activate the heater 1032. The heater 1032 heats the flowing coolant to increase the temperature of the coolant. The circulation pump 1031 pushes the heated coolant to circulate in the system to ensure that the heat can be evenly distributed. The heated coolant flows through the pipeline to the battery cluster 30, exchanges heat with the battery cells, and transfers heat to the battery cells. The battery cells in the battery cluster 30 absorb the heat transferred by the coolant, and the temperature rises until it reaches or exceeds the preset operating temperature.

[0057] Optionally, in some embodiments of the present application, when the battery cluster 30 performs charge and discharge operations, the power conversion module 20 will convert electrical energy as needed. The heated coolant is pushed by the circulation pump and flows to the battery cluster 30. During this process, the coolant continues to absorb the heat generated by the power conversion module 20. The heated coolant flows through the battery cluster 30, exchanges heat with the battery cells, and transfers the heat to the battery cells, thereby increasing the temperature of the battery cells.

[0058] Optionally, in some embodiments of the present application, please refer to Figure 5 , the power conversion module 20 includes a power conversion unit 201 and a proportional valve 202. Among them, the first end of the power conversion unit 201 and the first end of the proportional valve 202 are connected to the first node, the second end of the power conversion unit 201 and the second end of the proportional valve 202 are connected to the second node, and the proportional valve 202 is used to control the flow rate of the coolant flowing through the power conversion unit 201; the battery cluster 30 is connected to the first node; the temperature adjustment module 10 is connected to the second node.

[0059] Specifically, the refrigerant flows out of the temperature regulation module 10 and exchanges heat with the hotter coolant flowing out of the power conversion module 20 and the battery cluster 30. The coolant circulates in the system, continuously absorbing and releasing heat to maintain the battery cluster 30 and the power conversion module 20 within a suitable temperature range.

[0060] Optionally, in some embodiments of the present application, when the flow rate of the coolant flowing through the power conversion unit 201 is adjusted to the maximum, the proportional valve 202 is closed.

[0061] For example, when the load of the power conversion unit 201 is extremely high or the ambient temperature is high, the maximum coolant flow rate is required to maintain a suitable operating temperature. When the proportional valve 202 is closed, the coolant will no longer be flow-controlled, thus achieving the maximum flow rate. At the same time, when the proportional valve 202 is closed, the coolant will flow through the power conversion unit 201 through a more direct or shorter path, which helps to improve the cooling efficiency.

[0062] Among them, the proportional valve 202 can be an electric proportional control valve. The electric proportional control valve adjusts the opening degree proportionally according to the electrical signal, thereby precisely controlling the flow rate of the coolant. By precisely controlling the coolant flow rate, the electric proportional control valve helps to maintain the temperature of the power conversion unit 201 within a preset range. In the energy storage system 1, the electric proportional control valve can be automatically adjusted according to real-time temperature data to achieve intelligent temperature control.

[0063] The power conversion unit 201 can be an inverter, a rectifier, a DC-DC converter, or other types of power conversion devices. The power conversion unit 201 can refer to any of the above-mentioned power conversion devices, depending on the design and application requirements of the energy storage system 1. For example, if the energy storage system 1 needs to convert the direct current of the battery into alternating current to supply the power grid, then the power conversion unit 201 can be an inverter; if the energy storage system 1 needs to charge the battery from the power grid, then the power conversion unit 201 can be a rectifier or a bidirectional converter.

[0064] Optionally, in some embodiments of the present application, please refer to Figure 6 , the battery cluster 30 includes a plurality of parallel-connected battery packs 301, and each battery pack 301 is respectively arranged on the third branch.

[0065] For example, in a high-temperature environment, the refrigerant cools down the coolant flowing through the power conversion unit 201 through the heat exchange component 102. Then, the coolant subsequently flows through the battery cluster 30 to absorb the heat generated by each battery pack 301, thereby maintaining the battery cluster 30 within a suitable temperature range and preventing overheating. In a low-temperature environment, the heater 1032 in the heating component 103 heats the coolant to increase the temperature of the coolant.

[0066] An embodiment of the present application provides an energy storage system 1, which includes a temperature regulation module 10, a power conversion module 20, and a battery cluster 30. Among them, multiple power conversion modules 20 are respectively arranged on multiple first branches, and the first end of the power conversion module 20 is connected to the temperature regulation module 30. Multiple battery clusters 30 are respectively arranged on multiple first branches, and the first end of the battery cluster 30 is connected to the second end of the power conversion module 20, and the second end of the battery cluster 30 is connected to the temperature regulation module 10. In the energy storage system provided by the present application, the power conversion module 20 and the battery cluster 30 are arranged on the same branch, which can simplify the system architecture of the energy storage system 1. In addition, the power conversion module 20 and the battery cluster 3 can simultaneously control the temperature of the power conversion module 20 and the battery cluster 30, eliminating the uncontrollability of the power conversion module using environmental heat dissipation and improving the cooling efficiency.

[0067] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present application, such as the mutual combination of technical features in each embodiment, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

[0068] In addition, for structural elements with the same or similar characteristics, the present application may use the same or different reference numerals for identification. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0069] In the present application, the term "for example" is used to mean "used as an example, illustration, or explanation". Any embodiment described as "for example" in the present application is not necessarily interpreted as being more preferred or more advantageous than other embodiments. In order for any person skilled in the art to implement and use the present application, the above description is given. In the above description, various details are listed for the purpose of explanation.

[0070] It should be understood that those of ordinary skill in the art can recognize that the present application can also be implemented without using these specific details. In other embodiments, well-known structures and processes will not be elaborated in detail to avoid unnecessary details from making the description of the present application obscure. Therefore, the present application is not intended to be limited to the disclosed embodiments, but is consistent with the broadest scope that conforms to the principles and features disclosed in the present application.

[0071] The above has introduced in detail a kind of energy storage system provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An energy storage system, characterized in that, including a temperature regulation module; a power conversion module, a plurality of the power conversion modules are respectively arranged on a plurality of first branches, and a first end of the power conversion module is connected to the temperature regulation module; a battery cluster, a plurality of the battery clusters are respectively arranged on a plurality of first branches, and a first end of the battery cluster is connected to a second end of the power conversion module, a second end of the battery cluster is connected to the temperature regulation module, and the battery cluster and the corresponding power conversion module are connected in series through the same first branch, and all the first branches are connected in parallel and then connected to the temperature regulation module through a second branch to form a loop.

2. The energy storage system according to claim 1, wherein The temperature regulation module includes a cooling component, a heat exchange component and a heating component; wherein, the liquid flowing through the cooling component and the liquid flowing through the heating component perform heat exchange through the heat exchange component, a first end of the power conversion module is connected to the heating component, and a second end of the battery cluster is connected to the heating component.

3. The energy storage system according to claim 2, wherein The heating component includes a circulation pump and a heater; wherein, a first end of the circulation pump is connected to the power conversion module, a second end of the circulation pump is connected to a first end of the heat exchange component, a first end of the heater is connected to the first end of the heat exchange component, and a second end of the heater is connected to a second end of the battery cluster.

4. The energy storage system according to claim 3, characterized in that, The cooling component includes a compressor, a condenser and an expansion valve; wherein, a first end of the compressor is connected to the heat exchange component, a second end of the compressor is connected to a first end of the expansion valve through the condenser, and a second end of the expansion valve is connected to the heat exchange component.

5. The energy storage system according to claim 4, wherein When cooling the battery cluster, the compressor compresses the refrigerant, and the compressed gaseous refrigerant is condensed into a liquid refrigerant through the condenser, and the liquid refrigerant exchanges heat with the coolant flowing through the battery cluster in the heat exchange component.

6. The energy storage system according to claim 4, wherein When the temperature is less than a preset value, the coolant is heated by the heater so that the heated coolant flows through the battery cluster to heat the battery cells in the battery cluster.

7. The energy storage system according to claim 4, characterized in that, When the battery cells in the battery cluster are charged and discharged, the heater is turned off, and the temperature of the power conversion module is used to heat the coolant so that the heated coolant flows through the battery cluster to heat the battery cells in the battery cluster.

8. The energy storage system according to any one of claims 1 to 7, characterized in that, The power conversion module includes a power conversion unit and a proportional valve; wherein, a first end of the power conversion unit and a first end of the proportional valve are connected to a first node, a second end of the power conversion unit and a second end of the proportional valve are connected to a second node, and the proportional valve is used to control the flow rate of the coolant flowing through the power conversion unit; the battery cluster is connected to the first node; the temperature regulation module is connected to the second node.

9. The energy storage system according to claim 8, wherein If the flow rate of the coolant flowing through the power conversion unit is adjusted to the maximum, the proportional valve is closed.

10. The energy storage system according to any one of claims 1 to 7, characterized in that, The battery cluster includes a plurality of battery packs connected in parallel, and each battery pack is respectively arranged on a third branch.

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