energy storage system

Abstract

The application provides an energy storage system, which comprises at least one energy storage subsystem and at least one thermal management subsystem. The energy storage subsystem comprises at least one energy storage unit and a converter unit. The energy storage unit comprises a battery assembly and a first cold plate. The first cold plate is in heat-conducting contact with the battery assembly. The first cold plate has a first liquid inlet and a first liquid outlet. The converter unit comprises a converter and a second cold plate. The second cold plate is in heat-conducting contact with the converter. The second cold plate has a second liquid inlet and a second liquid outlet. The thermal management subsystem comprises a liquid storage container. The liquid storage container is configured to store a cooling medium. The liquid storage container has a liquid supply port and a liquid return port. The liquid supply port is in communication with the second liquid inlet. The second liquid outlet is in communication with the first liquid inlet. The first liquid outlet is in communication with the liquid return port. In the energy storage system, the heat dissipation performance of the energy storage subsystem is good, and the temperature uniformity of the battery assembly is high.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to an energy storage system. Background Technology

[0002] In high-voltage cascaded energy storage systems, battery clusters and PCS (power conversion systems) are distributed and connected to the grid after forming cascaded modules. The cascaded modules include battery units and PCS units, both of which have heat dissipation requirements.

[0003] In related technologies, low-voltage boosting solutions provide centralized cooling for the PCS cabinet, but high-voltage cascading solutions lack corresponding thermal management solutions for the distributed cascading modules, which cannot guarantee the safety of the cascading modules. Utility Model Content

[0004] Based on this, this application provides an energy storage system to address the shortcomings of related technologies.

[0005] The energy storage system provided in this application includes at least one energy storage subsystem and at least one thermal management subsystem. The energy storage subsystem includes:

[0006] At least one energy storage unit, the energy storage unit includes a battery module and a first cold plate, the first cold plate is in thermal contact with the battery module, and the first cold plate has a first liquid inlet and a first liquid outlet;

[0007] The converter unit includes a converter and a second cold plate. The second cold plate is in thermal contact with the converter and has a second liquid inlet and a second liquid outlet.

[0008] The thermal management subsystem includes:

[0009] A liquid storage container is configured to store a cooling medium. The liquid storage container has a liquid inlet and a liquid return outlet. The liquid inlet is connected to a second liquid inlet, the second liquid outlet is connected to a first liquid inlet, and the first liquid outlet is connected to a liquid return outlet.

[0010] In one possible implementation, there are at least two energy storage units, and the second liquid outlet is connected to at least two first liquid inlets.

[0011] In one possible implementation, the energy storage unit further includes at least one first control valve, which is configured in a one-to-one correspondence with the first cold plate;

[0012] The first control valve is located between the second liquid outlet and the first liquid inlet, and is configured to regulate the flow rate of the cooling medium entering the first cold plate.

[0013] In one possible implementation, the thermal management subsystem further includes a first heat exchange unit, the inlet of which is connected to a first outlet, and the outlet of which is connected to a return outlet. The first heat exchange unit is configured to start when the thermal load of the energy storage subsystem reaches a first threshold.

[0014] In one possible implementation, a second heat exchange unit is also included, wherein the inlet end of the second heat exchange unit is connected to the first outlet end, and the outlet end of the second heat exchange unit is connected to the return end end. The first heat exchange unit is configured to start when the heat load of the energy storage subsystem reaches a second threshold.

[0015] The first threshold is less than the second threshold.

[0016] In one possible implementation, the thermal management subsystem further includes two second control valves, one of which is connected to the first liquid outlet, the first heat exchange unit, and the second heat exchange unit, and is configured to control one of the first heat exchange unit and the second heat exchange unit to communicate with the first cold plate.

[0017] Another second control valve is connected to the return port, the first heat exchange unit and the second heat exchange unit, and is configured to control one of the first heat exchange unit and the second heat exchange unit to communicate with the liquid storage container.

[0018] In one possible implementation, the first heat exchange unit includes a first heat exchanger and a fan, with both a first liquid outlet and a liquid return outlet connected to the first heat exchanger, and the fan located on one side of the first heat exchanger.

[0019] In one possible implementation, the second heat exchange unit includes a second heat exchanger, an expansion valve, a compressor, and a condenser, which are connected in sequence to form a circulation loop. The first liquid outlet and the liquid return outlet are both connected to the second heat exchanger.

[0020] In one possible implementation, the thermal management subsystem also includes a drive pump located between the liquid delivery port and the second liquid inlet, and configured to drive the flow of the cooling medium.

[0021] In one possible implementation, a thermal management subsystem is configured to correspond to multiple energy storage subsystems and is constructed to dissipate heat from the multiple energy storage subsystems.

[0022] In one possible implementation, each energy storage subsystem further includes a fourth control valve located between the liquid delivery port and the second liquid inlet, and configured to regulate the flow rate of the cooling medium entering the second cold plate.

[0023] In one possible implementation, each energy storage subsystem also includes two fifth control valves, one of which is located between the liquid delivery port and the second liquid inlet and is configured to control the on / off state between the second cold plate and the liquid storage container.

[0024] Another fifth control valve is located between the first liquid outlet and the liquid return port and is configured to control the on / off state between the first cold plate and the liquid storage container.

[0025] In one possible implementation, the thermal management subsystem is configured in a one-to-one correspondence with the energy storage subsystem and is designed to dissipate heat from the corresponding energy storage subsystem.

[0026] The energy storage system provided in this application includes an energy storage subsystem and a thermal management subsystem. The energy storage subsystem includes an energy storage unit and a converter unit. The energy storage unit includes a battery module and a first cold plate. The first cold plate includes a first liquid inlet and a first liquid outlet. The converter unit includes a converter and a second cold plate. The second cold plate includes a second liquid inlet and a second liquid outlet. The thermal management subsystem includes a liquid storage container, which includes a liquid inlet and a liquid return outlet. By setting up a liquid storage container to store a cooling medium, setting up a battery module to store and release electrical energy, setting up a first cold plate to dissipate heat from the battery module, setting up a converter to manage the flow of electrical energy between the battery module and the grid or load, and setting up a second cold plate to dissipate heat from the converter, the energy storage subsystem can improve its heat dissipation performance by setting up a first cold plate and a second cold plate. Because the liquid inlet, the second liquid inlet, the second liquid outlet, the first liquid inlet, the first liquid outlet and the return liquid outlet are connected in sequence, the subcooled cooling medium in the liquid storage container can first flow to the second cold plate. Then, when the cooling medium circulates in the second cold plate, it absorbs the heat of the converter to dissipate heat from the converter. After absorbing the heat of the converter, the cooling medium can change from a subcooled state to a low subcooled state or a saturated state. This results in a higher and more uniform heat dissipation coefficient of the cooling medium circulating in the first cold plate, thereby improving the temperature uniformity of the battery module.

[0027] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that the energy storage system provided by this application can solve, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 Schematic diagram of the energy storage system provided in the embodiments of this application Figure 1 ;

[0030] Figure 2 Schematic diagram of the energy storage system provided in the embodiments of this application Figure 2 ;

[0031] Figure 3 Schematic diagram of the energy storage system provided in the embodiments of this application Figure 3 ;

[0032] Figure 4 for Figure 1 A diagram showing the working state of the first heat exchange unit being open and the second heat exchange unit being closed.

[0033] Figure 5 for Figure 1 Diagram showing the working state with the first heat exchange unit closed and the second heat exchange unit open;

[0034] Figure 6 Schematic diagram of the energy storage system provided in the embodiments of this application Figure 4 ;

[0035] Figure 7 for Figure 6 A schematic diagram of the energy storage subsystem.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100 - Energy storage subsystem; 110 - Energy storage unit; 111 - Battery assembly; 112 - First cold plate; 113 - First control valve; 120 - Converter unit; 121 - Converter; 122 - Second cold plate; 130 - Fourth control valve; 140 - Fifth control valve; 200 - Thermal management subsystem; 210 - Liquid storage container; 220 - First heat exchange unit; 221 - First heat exchanger; 222 - Fan; 230 - Second heat exchange unit; 231 - Second heat exchanger; 232 - Expansion valve; 233 - Compressor; 234 - Condenser; 240 - Second control valve; 250 - Drive pump. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] The terms "first," "second," and "third" (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0042] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0043] In high-voltage cascaded energy storage systems, battery clusters and PCS (power conversion systems) are distributed and connected to the grid after forming cascaded modules. The cascaded modules include battery units and PCS units, both of which have heat dissipation requirements.

[0044] In related technologies, low-voltage boosting solutions provide centralized cooling for the PCS cabinet, but high-voltage cascading solutions lack corresponding thermal management solutions for the distributed cascading modules, which cannot guarantee the safety of the cascading modules.

[0045] In view of the above problems, this application provides an energy storage system in which the thermal management subsystem can simultaneously provide a cooling medium for a first cold plate and a second cold plate, so that the first cold plate dissipates heat for the battery module and the second cold plate dissipates heat for the inverter, thereby improving the heat dissipation performance of the energy storage subsystem. Furthermore, the cooling medium first enters the second cold plate to absorb the heat from the inverter, so that the cooling medium enters the first cold plate in a near-saturated or saturated state, thereby improving the temperature uniformity of the battery module.

[0046] The specific implementation of the energy storage system provided in this application will be described in detail below with reference to the accompanying drawings.

[0047] Reference Figures 1 to 6 As shown in the embodiments of this application, the energy storage system includes at least one energy storage subsystem 100 and at least one thermal management subsystem 200. The energy storage subsystem 100 includes at least one energy storage unit 110 and a converter unit 120. The energy storage unit 110 includes a battery assembly 111 and a first cold plate 112. The first cold plate 112 is in thermal contact with the battery assembly 111 and has a first liquid inlet and a first liquid outlet. The converter unit 120 includes a converter 121 and a second cold plate 122. The second cold plate 122 is in thermal contact with the converter 121 and has a second liquid inlet and a second liquid outlet.

[0048] The thermal management subsystem 200 includes a liquid storage container 210, which is configured to store a cooling medium. The liquid storage container 210 has a liquid inlet and a liquid return outlet. The liquid inlet is connected to a second liquid inlet, the second liquid outlet is connected to a first liquid inlet, and the first liquid outlet is connected to a liquid return outlet.

[0049] In this embodiment, the battery assembly 111 is used to store and release electrical energy, and the first cold plate 112 is used to dissipate heat from the battery assembly 111, thereby maintaining the temperature of the battery assembly 111 within a normal range and improving the safety of the battery assembly 111. In a specific configuration, the energy storage unit 110 can be stacked on top of the inverter unit 120 to facilitate the arrangement of piping and thus save space.

[0050] The first cold plate 112 may be disposed on one side of the battery assembly 111, or the first cold plate 112 may be disposed on opposite sides of the battery assembly 111. This application embodiment does not limit this.

[0051] The converter 121 is a device for power conversion and management. The main function of the converter 121 is to manage the flow of electrical energy between the battery assembly 111 and the power grid or load. The second cold plate 122 is used to make thermal contact with the converter 121, thereby cooling the converter 121 when it overheats, so as to maintain the temperature of the converter 121 within the required range.

[0052] Specifically, the converter 121 may include capacitors, inductors, and IGBT devices. The inductor has internal conduits with reserved conduit interfaces and is connected in series with the second cold plate 122 for cooling.

[0053] The liquid storage container 210 is used to store the cooling medium so that the liquid storage container 210 provides the first cold plate 112 and the second cold plate 122 with the cooling medium in a supercooled state. In the process of circulation, the cooling medium absorbs heat and changes from a supercooled state to a saturated state to remove the heat from the battery assembly 111 and the inverter 121, thereby cooling down the battery assembly 111 and the inverter 121.

[0054] It should be noted that since the cooling medium in the supercooled state needs to absorb a certain amount of heat before it becomes saturated, and the cooling medium in the supercooled state has a low heat dissipation coefficient while the cooling medium in the saturated state has a high heat dissipation coefficient, if the supercooled cooling medium circulates within the first cold plate 112, it will take time for the cooling medium to change from the supercooled state to the saturated state. This will result in uneven heat dissipation coefficient of the cooling medium within the first cold plate 112, which in turn will lead to uneven temperature of the battery assembly 111.

[0055] In this embodiment, the liquid inlet, the second liquid inlet, the second liquid outlet, the first liquid inlet, the first liquid outlet and the return liquid outlet are connected in sequence. That is, the liquid storage container 210, the second cold plate 122 and the first cold plate 112 are connected in sequence and form a circuit. The subcooled cooling medium in the liquid storage container 210 flows along the second cold plate 122 and the first cold plate 112 in sequence. Therefore, the subcooled cooling medium can first absorb the heat of the inverter 121, and then the subcooled cooling medium changes from a subcooled state to a low subcooled state or a saturated state before entering the first cold plate 112. Since the cooling medium in the first cold plate 112 is in a state close to saturation or has reached saturation, the cooling medium is in a mixed state of gas and liquid. At this time, the heat dissipation coefficient of the cooling medium in the first cold plate is relatively uniform and the heat dissipation coefficient of the cooling medium is relatively high, which can improve the temperature uniformity of the battery assembly 111.

[0056] The cooling medium can be R1233zd (1-chloro-3,3,3-trifluoropropene), R123 (2,2-dichloro-1,1,1-trifluoroethane), R245fa (1,1,1,3,3-pentafluoropropane), etc., and the embodiments of this application do not limit it.

[0057] The energy storage system provided in this application embodiment includes an energy storage subsystem 100 and a thermal management subsystem 200. The energy storage subsystem 100 includes an energy storage unit 110 and a converter unit 120. The energy storage unit 110 includes a battery assembly 111 and a first cold plate 112. The first cold plate 112 includes a first liquid inlet and a first liquid outlet. The converter unit 120 includes a converter 121 and a second cold plate 122. The second cold plate 122 includes a second liquid inlet and a second liquid outlet. The thermal management subsystem 200 includes a liquid storage container 210. The liquid storage container 210 includes a liquid delivery port and a liquid return port. By setting up a liquid storage container 210 to store the cooling medium, setting up a battery assembly 111 to store and release electrical energy, setting up a first cold plate 112 to dissipate heat from the battery assembly 111, setting up a converter 121 to manage the flow of electrical energy between the battery assembly 111 and the grid or load, and setting up a second cold plate 122 to dissipate heat from the converter 121, the energy storage subsystem 100 can improve its heat dissipation performance by setting up a first cold plate 112 and a second cold plate 122. Since the liquid inlet, the second liquid inlet, the second liquid outlet, the first liquid inlet, the first liquid outlet and the return liquid outlet are connected in sequence, the subcooled cooling medium in the liquid storage container 210 can first flow to the second cold plate 122. Then, when the cooling medium circulates in the second cold plate 122, it absorbs the heat of the inverter 121 to dissipate heat from the inverter 121. After absorbing the heat from the inverter 121, the cooling medium can change from a subcooled state to a low subcooled state or a saturated state. This results in a higher and more uniform heat dissipation coefficient of the cooling medium circulating in the first cold plate 112, thereby improving the temperature uniformity of the battery assembly 111.

[0058] Reference Figure 2 , Figure 3 As shown, in one possible implementation, there are at least two energy storage units 110, and the second liquid outlet is connected to at least two first liquid inlets. That is, along the flow direction of the cooling medium, at least two first cold plates 112 are connected in parallel, and the second cold plate 122 is connected in series with at least two first cold plates 112. In this way, the cooling medium in the second cold plate 122 can first absorb the heat of the inverter 121, and the cooling medium changes from a low subcooled state to a low subcooled state or a saturated state, and then is diverted to each of the first cold plates 112, thereby improving the temperature uniformity of each battery module 111.

[0059] Reference Figure 2 , Figure 3As shown, in one possible implementation, the energy storage unit 110 further includes at least one first control valve 113, which is configured to correspond one-to-one with the first cold plate 112. The first control valve 113 is located between the second liquid outlet and the first liquid inlet and is configured to regulate the flow rate of the cooling medium entering the first cold plate 112.

[0060] Thus, when the cooling medium flows from the second cold plate 122 to each of the first cold plates 112, since a first control valve 113 is provided between the second cold plate 122 and each of the first cold plates 112, the first control valve 113 can adjust the cooling medium flow rate of the corresponding first cold plate 112, thereby making it easy to independently control the cooling medium flow rate of each first cold plate 112. This facilitates flow control according to the heat dissipation requirements of each battery module 111, thereby improving the temperature uniformity of each battery module 111 in the energy storage subsystem 100.

[0061] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, in one possible implementation, the thermal management subsystem 200 further includes a first heat exchange unit 220 and a second heat exchange unit 230. The liquid inlet of the first heat exchange unit 220 is connected to a first liquid outlet, and the liquid outlet of the first heat exchange unit 220 is connected to a liquid return port. The first heat exchange unit 220 is configured to start when the heat load of the energy storage subsystem 100 reaches a first threshold.

[0062] The inlet of the second heat exchange unit 230 is connected to the first outlet, and the outlet of the second heat exchange unit 230 is connected to the return outlet. The first heat exchange unit 220 is configured to start when the heat load of the energy storage subsystem 100 reaches a second threshold. The first threshold is less than the second threshold.

[0063] In other words, the cooling medium can be cooled in stages. When the heat load of the energy storage subsystem 100 reaches the first threshold but not the second threshold, the first heat exchange unit 220 works and the second heat exchange unit 230 does not work. The cooling medium flowing from the first cold plate 112 can be cooled by the first heat exchange unit 220, so that after the cooling medium releases heat, it changes from a saturated state to a supercooled state and flows back to the liquid storage container 210. This cycle repeats continuously to dissipate heat for the battery assembly 111 and the inverter 121.

[0064] When the heat load of the energy storage subsystem 100 reaches the second threshold, the first heat exchange unit 220 does not work, and the second heat exchange unit 230 works. The cooling medium flowing from the first cold plate 112 can be cooled by the second heat exchange unit 230, so that after the cooling medium releases heat, it changes from a saturated state to a supercooled state, returns to the liquid storage container 210, and then flows to the second cold plate 122 and the first cold plate 112 to continuously dissipate heat for the battery assembly 111 and the inverter 121.

[0065] This can improve the thermal management efficiency and energy utilization rate of the energy storage system.

[0066] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, in one possible implementation, the thermal management subsystem 200 further includes two second control valves 240. One second control valve 240 is connected to the first liquid outlet, the first heat exchange unit 220 and the second heat exchange unit 230, and is configured to control one of the first heat exchange unit 220 and the second heat exchange unit 230 to communicate with the first cold plate 112.

[0067] Another second control valve 240 is connected to the return port, the first heat exchange unit 220 and the second heat exchange unit 230, and is configured to control one of the first heat exchange unit 220 and the second heat exchange unit 230 to communicate with the liquid storage container 210.

[0068] With this configuration, by setting two second control valves 240, the cooling medium can be cooled by one of the first heat exchange unit 220 and the second heat exchange unit 230 before flowing back to the liquid storage container 210, thereby facilitating the staged cooling of the cooling medium and improving the energy utilization rate of the energy storage system.

[0069] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, in one possible implementation, each second control valve 240 has three ports. One port of one second control valve 240 is connected to the first liquid outlet, and the other two ports of one second control valve 240 are connected to the first heat exchange unit 220 and the second heat exchange unit 230, respectively. One port of another second control valve 240 is connected to the return liquid port, and the other two ports of the other second control valve 240 are connected to the first heat exchange unit 220 and the second heat exchange unit 230, respectively.

[0070] This allows a second control valve 240 to connect to the first liquid outlet, the first heat exchange unit 220, and the second heat exchange unit 230, thereby facilitating the second control valve 240 to control one of the first heat exchange units 220 and 230 to connect to the first cold plate 112 and disconnect the other from the first cold plate 112. Another second control valve 240 is connected to the liquid return port, the first heat exchange unit 220, and the second heat exchange unit 230, thereby facilitating the second control valve 240 to control one of the first heat exchange units 220 and 230 to connect to the liquid storage container 210 and disconnect the other from the liquid storage container 210.

[0071] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, in one possible implementation, the first heat exchange unit 220 includes a first heat exchanger 221 and a fan 222. The first liquid outlet and the liquid return outlet are both connected to the first heat exchanger 221, and the fan 222 is disposed on one side of the first heat exchanger 221.

[0072] In this way, when the heat load of the energy storage subsystem 100 is low, the cooling medium in the first heat exchanger 221 can be cooled by air cooling, thereby reducing the energy consumption of the energy storage system.

[0073] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, in one possible implementation, the second heat exchange unit 230 includes a second heat exchanger 231, an expansion valve 232, a compressor 233, and a condenser 234. The second heat exchanger 231, the expansion valve 232, the compressor 233, and the condenser 234 are connected in sequence to form a circulation loop. The first liquid outlet and the liquid return outlet are both connected to the second heat exchanger 231.

[0074] Thus, when the heat load of the energy storage subsystem 100 is high, the compressor 233, condenser 234 and expansion valve 232 can work together to make the cooling medium in the second heat exchanger 231 change from a saturated state to a subcooled state and then flow back to the liquid storage container 210.

[0075] Reference Figures 1 to 6 As shown, in one possible implementation, the thermal management subsystem 200 further includes a drive pump 250, which is disposed between the liquid inlet and the second liquid inlet and is configured to drive the flow of the cooling medium, thereby causing the cooling medium to circulate between the second cold plate 122, each of the first cold plates 112 and the liquid storage container 210, thereby continuously dissipating heat and cooling the battery assembly 111 and the inverter 121.

[0076] Reference Figure 1 , Figures 4 to 6 As shown, in one possible implementation, a thermal management subsystem 200 is configured to correspond to multiple energy storage subsystems 100 and is configured to dissipate heat from the multiple energy storage subsystems 100.

[0077] In other words, a thermal management subsystem 200 can centrally dissipate heat from multiple energy storage subsystems 100, thereby reducing the space occupied by the thermal management subsystem 200 and the cost of the energy storage system.

[0078] For example, the energy storage system has a container body, and a thermal management subsystem 200 and multiple energy storage subsystems 100 are all housed inside the container body. In this way, the head of the drive pump 250, the capacity of the liquid storage container 210, and the power of the first heat exchange unit 220 and the second heat exchange unit 230 can be selected according to the number of energy storage subsystems 100.

[0079] Reference Figure 1 , Figure 4 , Figure 5 As shown, in one possible implementation, each energy storage subsystem 100 further includes a fourth control valve 130, which is disposed between the liquid delivery port and the second liquid inlet and is configured to regulate the flow rate of the cooling medium entering the second cold plate 122.

[0080] Thus, when a thermal management subsystem 200 provides heat dissipation to multiple energy storage subsystems 100, the fourth control valve 130 can adjust the flow rate of the cooling medium supplied by the liquid storage container 210 to the second cold plate 122 of each energy storage subsystem 100, so as to control the flow rate according to the heat dissipation requirements of each energy storage subsystem 100.

[0081] Reference Figure 7 As shown, in one possible implementation, each energy storage subsystem 100 further includes two fifth control valves 140. One fifth control valve 140 is located between the liquid delivery port and the second liquid inlet and is configured to control the on / off state between the second cold plate 122 and the liquid storage container 210. The other fifth control valve 140 is located between the first liquid outlet and the liquid return port and is configured to control the on / off state between the first cold plate 112 and the liquid storage container 210.

[0082] In this way, when a certain energy storage subsystem 100 does not need to dissipate heat, the two fifth control valves 140 can be closed, thereby preventing the cooling medium from entering the first cold plate 112 and the second cold plate 122 of the energy storage subsystem 100.

[0083] Reference Figure 2 , Figure 3 As shown, in one possible implementation, the thermal management subsystem 200 is configured to correspond one-to-one with the energy storage subsystem 100 and is constructed to dissipate heat from the corresponding energy storage subsystem 100.

[0084] In this configuration, each thermal management subsystem 200 can dissipate heat for the corresponding energy storage subsystem 100, thereby improving the heat dissipation performance of the battery module 111 and the inverter 121 in each energy storage subsystem 100.

[0085] For example, an energy storage system includes a cabinet, an energy storage subsystem 100, and a thermal management subsystem 200, which are integrated within the cabinet.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An energy storage system, characterized in that, It includes at least one energy storage subsystem (100) and at least one thermal management subsystem (200), the energy storage subsystem (100) comprising: At least one energy storage unit (110) includes a battery assembly (111) and a first cold plate (112), the first cold plate (112) being in thermal contact with the battery assembly (111), and the first cold plate (112) having a first liquid inlet and a first liquid outlet; A converter unit (120) includes a converter (121) and a second cold plate (122), the second cold plate (122) being in thermal contact with the converter (121), and the second cold plate (122) having a second liquid inlet and a second liquid outlet; The thermal management subsystem (200) includes: A liquid storage container (210) is configured to store a cooling medium. The liquid storage container (210) has a liquid inlet and a liquid return outlet. The liquid inlet is connected to a second liquid inlet, the second liquid outlet is connected to the first liquid inlet, and the first liquid outlet is connected to the liquid return outlet.

2. The energy storage system according to claim 1, characterized in that, The energy storage unit (110) is at least two, and the second liquid outlet is connected to at least two of the first liquid inlets.

3. The energy storage system according to claim 1, characterized in that, The energy storage unit (110) also includes at least one first control valve (113), and the first control valve (113) is provided in a one-to-one correspondence with the first cold plate (112); The first control valve (113) is located between the second liquid outlet and the first liquid inlet and is configured to regulate the flow rate of the cooling medium entering the first cold plate (112).

4. The energy storage system according to claim 1, characterized in that, The thermal management subsystem (200) further includes a first heat exchange unit (220), the inlet of the first heat exchange unit (220) is connected to the first outlet, the outlet of the first heat exchange unit (220) is connected to the return port, and the first heat exchange unit (220) is configured to start when the heat load of the energy storage subsystem (100) reaches a first threshold.

5. The energy storage system according to claim 4, characterized in that, It also includes a second heat exchange unit (230), the inlet end of the second heat exchange unit (230) is connected to the first outlet, the outlet end of the second heat exchange unit (230) is connected to the return port, and the first heat exchange unit (220) is configured to start when the heat load of the energy storage subsystem (100) reaches a second threshold. Wherein, the first threshold is less than the second threshold.

6. The energy storage system according to claim 5, characterized in that, The thermal management subsystem (200) further includes two second control valves (240), one of which is connected to the first liquid outlet, the first heat exchange unit (220), and the second heat exchange unit (230), and is configured to control one of the first heat exchange unit (220) and the second heat exchange unit (230) to communicate with the first cold plate (112); Another second control valve (240) is connected to the return port, the first heat exchange unit (220) and the second heat exchange unit (230), and is configured to control one of the first heat exchange unit (220) and the second heat exchange unit (230) to communicate with the liquid storage container (210).

7. The energy storage system according to claim 4, characterized in that, The first heat exchange unit (220) includes a first heat exchanger (221) and a fan (222). The first liquid outlet and the liquid return outlet are both connected to the first heat exchanger (221), and the fan (222) is located on one side of the first heat exchanger (221).

8. The energy storage system according to claim 5, characterized in that, The second heat exchange unit (230) includes a second heat exchanger (231), an expansion valve (232), a compressor (233), and a condenser (234). The second heat exchanger (231), the expansion valve (232), the compressor (233), and the condenser (234) are connected in sequence to form a circulation loop. The first liquid outlet and the liquid return outlet are both connected to the second heat exchanger (231).

9. The energy storage system according to any one of claims 1-8, characterized in that, The thermal management subsystem (200) further includes a drive pump (250) disposed between the liquid delivery port and the second liquid inlet and configured to drive the flow of cooling medium.

10. The energy storage system according to any one of claims 1-8, characterized in that, One of the thermal management subsystems (200) is configured to correspond to a plurality of the energy storage subsystems (100) and is configured to dissipate heat from the plurality of the energy storage subsystems (100).

11. The energy storage system according to claim 10, characterized in that, Each of the energy storage subsystems (100) further includes a fourth control valve (130) disposed between the liquid delivery port and the second liquid inlet and configured to regulate the flow rate of the cooling medium entering the second cold plate (122).

12. The energy storage system according to claim 10, characterized in that, Each of the energy storage subsystems (100) further includes two fifth control valves (140), one of which is disposed between the liquid delivery port and the second liquid inlet and is configured to control the on / off state between the second cold plate (122) and the liquid storage container (210); Another fifth control valve (140) is disposed between the first liquid outlet and the liquid return port and is configured to control the on / off state between the first cold plate (112) and the liquid storage container (210).

13. The energy storage system according to any one of claims 1-8, characterized in that, The thermal management subsystem (200) is configured to correspond one-to-one with the energy storage subsystem (100) and is constructed to dissipate heat from the corresponding energy storage subsystem (100).

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