Energy storage system

Abstract

The utility model relates to an energy storage system which comprises an energy storage device and a heat management device, the energy storage device comprises a plurality of energy storage assemblies, the heat management device is used for conducting heat exchange with the energy storage device, the heat management device comprises an inflow pipe set and a backflow pipe set, the inflow pipe set comprises a plurality of inflow branches, and the backflow pipe set comprises a plurality of backflow branches. The inflow branch and the backflow branch are correspondingly arranged, and the multiple energy storage assemblies are connected between the inflow branch and the backflow branch. Wherein each energy storage assembly comprises at least two energy storage units and a switching pipeline, each energy storage unit comprises a heat exchange flow channel, and the heat exchange flow channels of the adjacent energy storage units in the same energy storage assembly are communicated through the switching pipeline. According to the energy storage system in the embodiment of the invention, the pipeline consumption can be reduced, the pipeline cost can be reduced, the flow speed of the cooling medium in the pipeline can be increased, the cooling efficiency is improved, and the stability and reliability of the energy storage system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power generation, in particular to an energy storage system. BACKGROUND

[0002] With the rapid development of energy storage technology, configuring an energy storage system has become a standard configuration for power generation in the field of wind power generation and the like, wherein an energy storage battery pack plays a crucial role. However, overvoltage, overheating and other phenomena of the energy storage battery pack may cause fire or even fire, which seriously threatens personal safety and property safety, so a thermal management device needs to be set to cool the energy storage battery pack.

[0003] In the energy storage system, the thermal management device injects cooling medium into the energy storage battery pack through multiple pipe groups, but the current energy storage system contains many components, and the required pipe quantity is large, and the pipe cost is high. CONTENT OF THE UTILITY MODEL

[0004] The present application provides an energy storage system which can reduce the amount of pipe, reduce the cost of pipe, at the same time can improve the flow rate of cooling medium in pipe, improve the cooling efficiency, improve the stability and reliability of energy storage system.

[0005] According to the embodiment of the present application, an energy storage system is provided, comprising an energy storage device and a thermal management device, the energy storage device comprises a plurality of energy storage assemblies, the thermal management device is used for heat exchange with the energy storage device, the thermal management device comprises an inflow pipe group and a return pipe group, the inflow pipe group comprises a plurality of inflow branches, the return pipe group comprises a plurality of return branches, the inflow branches and the return branches are correspondingly arranged, and the plurality of energy storage assemblies are respectively connected between the inflow branches and the return branches. Wherein, each energy storage assembly comprises at least two energy storage units and an adapter pipe, each energy storage unit comprises a heat exchange channel, and the heat exchange channels of adjacent energy storage units in the same energy storage assembly are communicated through the adapter pipe.

[0006] According to an aspect of the embodiment of the present application, the number of energy storage units included in each energy storage assembly is equal.

[0007] According to an aspect of the embodiment of the present application, the number of energy storage units included in each energy storage assembly is less than or equal to 3.

[0008] According to an aspect of the embodiment of the present application, the first switch is arranged in the return pipe group and the inflow pipe group, and the first switch is configured to control the on-off between the return pipe group and the return branch, and control the on-off between the inflow pipe group and the inflow branch.

[0009] According to an aspect of the embodiment of the present application, the second switch is arranged on the adapter pipe, and the second switch is used to control the on-off of the adapter pipe.

[0010] According to an aspect of the embodiment of the present application, the flow-in pipe group comprises a main flow-in pipe and a sub flow-in pipe connected to the main flow-in pipe, and the sub flow-in pipe is provided with a plurality of flow-in branches; the flow-back pipe group comprises a main flow-back pipe and a sub flow-back pipe connected to the main flow-back pipe, and the sub flow-back pipe is provided with a plurality of flow-back branches. The sub flow-in pipe and the sub flow-back pipe extend along a first direction and are oppositely arranged along a second direction, and the plurality of energy storage assemblies of the energy storage device are arranged at intervals along the first direction and are connected between the flow-in branches and the flow-back branches along the second direction, and the first direction and the second direction intersect.

[0011] According to an aspect of the embodiment of the present application, the main flow-in pipe and the main flow-back pipe are both provided with a third switch, and the third switch is used to control the on-off between the sub flow-in pipe and the main flow-in pipe and the on-off between the sub flow-back pipe and the main flow-back pipe.

[0012] According to an aspect of the embodiment of the present application, the lower end of the sub flow-back pipe along the first direction is connected to the main flow-back pipe, and the upper end of the sub flow-back pipe along the first direction is provided with an exhaust device.

[0013] According to an aspect of the embodiment of the present application, the main flow-in pipe is connected with a plurality of sub flow-in pipes, the main flow-back pipe is connected with a plurality of sub flow-back pipes, and the sub flow-in pipes and the sub flow-back pipes are arranged in pairs.

[0014] According to an aspect of the embodiment of the present application, the heat management device comprises at least two main flow-in pipes in parallel communication and at least two main flow-back pipes in parallel communication, and the main flow-in pipes and the main flow-back pipes are arranged in pairs.

[0015] The energy storage system provided by the embodiment of the present application comprises a plurality of energy storage assemblies, and each energy storage assembly comprises at least two energy storage units and a switching pipe. The heat exchange channels of adjacent energy storage units in the same energy storage assembly are connected in series through the switching pipe to form a heat exchange passage, and the heat exchange passage is connected in parallel between the flow-in pipe group and the flow-back pipe group through the flow-in branch and the flow-back branch, thereby forming a cooling pipe mode combining parallel connection and series connection. Compared with the cooling pipe mode in which each energy storage unit is connected in parallel, the energy storage system in the embodiment of the present application can reduce the total number of pipes and reduce the cost of the pipes. Moreover, based on the same number of energy storage units, the number of heat exchange passages connected in parallel can also be reduced, the flow rate of the cooling medium in the heat exchange passage can be improved, the cooling efficiency can be improved, and the stability and reliability of the energy storage system can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0017] Figure 1 is a structural schematic diagram of a heat management device according to an embodiment of the present application;

[0018] Figure 2 is a structural schematic diagram of an energy storage system according to an embodiment of the present application;

[0019] Figure 3 is a partial structural schematic diagram of an energy storage system according to an embodiment of the present application;

[0020] Figure 4 is a structural schematic diagram of a switching pipeline according to an embodiment of the present application;

[0021] Figure 5 is a structural schematic diagram of a main inflow pipeline and a main return pipeline according to an embodiment of the present application;

[0022] Figure 6 is a partial enlarged view of a thermal management device according to an embodiment of the present application.

[0023] In the drawings:

[0024] 10 - energy storage system;

[0025] 1 - energy storage assembly; 11 - energy storage unit; 12 - switching pipeline;

[0026] 2 - thermal management device; 21 - inflow pipeline group; 211 - inflow branch; 212 - main inflow pipeline; 213 - auxiliary inflow pipeline; 22 - return pipeline group; 221 - return branch; 222 - main return pipeline; 223 - auxiliary return pipeline; 23 - first switch; 24 - second switch; 25 - third switch; 26 - exhaust device;

[0027] X - second direction; Y - third direction; Z - first direction.

[0028] In the drawings, the same components have the same reference numerals. The drawings are not drawn according to the actual proportions. DETAILED DESCRIPTION

[0029] Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely illustrative of the present application and is not intended to limit the present application, as is apparent to one of ordinary skill in the art. In the drawings and the following description, well-known structures and techniques have not been shown in order not to obscure the present application; and, for the purpose of clarity, some structural components can be exaggerated in size or proportions. Furthermore, features, structures or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0030] The orientation words appearing in the following description are the directions shown in the drawings, and are not intended to limit the energy storage system of the present application. In the description of the present application, it should be further explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In order to facilitate the understanding of the technical solutions of the present application, the energy storage system in the embodiments of the present application will be described below in conjunction with the drawings.

[0032] Please refer to Figures 1 to 3 , Figure 1 The structural schematic diagram of the heat management device provided by some embodiments of the present application is shown, Figure 2 and Figure 3 The structural schematic diagram of the energy storage system provided by some embodiments of the present application is shown (only one set of energy storage assemblies is shown in the figure).

[0033] The energy storage system 10 provided by the embodiments of the present application includes an energy storage device and a heat management device 2, the energy storage device includes a plurality of energy storage assemblies 1, the heat management device 2 includes an inlet pipe group 21 and a return pipe group 22, the inlet pipe group 21 includes a plurality of inlet branches 211, the return pipe group 22 includes a plurality of return branches 221, the inlet branches 211 and the return branches 221 are correspondingly arranged, and the plurality of energy storage assemblies 1 are respectively connected between the inlet branches 211 and the return branches 221. Wherein, each energy storage assembly 1 includes at least two energy storage units 11 and an adapter pipe 12, each energy storage unit 11 includes a heat exchange flow channel, and the heat exchange flow channels of adjacent energy storage units 11 in the same energy storage assembly 1 are communicated through the adapter pipe 12.

[0034] The energy storage system 10 in the embodiments of the present application, the energy storage device includes a plurality of energy storage assemblies 1, each energy storage assembly 1 includes at least two energy storage units 11 and an adapter pipe 12, the heat exchange flow channels of adjacent energy storage units 11 in the same energy storage assembly 1 are connected in series through the adapter pipe 12 to form a heat exchange passage, and the heat exchange passage is connected in parallel between the inlet pipe group 21 and the return pipe group 22 through the inlet branches 211 and the return branches 221, thereby forming a cooling pipe mode combining parallel connection and series connection. Compared with the cooling pipe mode in which each energy storage unit 11 is connected in parallel, the energy storage system 10 in the embodiments of the present application can reduce the total number of pipes and reduce the cost of pipes. Moreover, on the basis of the same number of energy storage units 11, the number of heat exchange passages connected in parallel can also be reduced, the flow rate of the cooling medium in the heat exchange passage can be improved, the cooling efficiency can be improved, and the stability and reliability of the energy storage system 10 can be improved.

[0035] Optionally, the energy storage device can be a battery cluster, which can be used to store excess electrical energy when wind energy is stable, and release the stored electrical energy when the wind speed is low or the wind stops. The energy storage unit 11 is a battery module, and a plurality of battery modules are electrically connected and combined with each other to form a battery cluster to store more energy.

[0036] Optionally, the heat exchange channel can be integrated inside or outside the energy storage module. When the heat exchange channel is integrated inside the energy storage module, it can be in close contact with the energy storage module or maintain a certain gap. When the heat exchange channel is located outside the energy storage module, it can exchange heat with the energy storage module through heat-conducting materials, etc. The heat exchange channels of a plurality of energy storage units 11 of the same energy storage assembly 1 are connected in series through the conversion pipeline to form a heat exchange passage, the inlet of the heat exchange passage is connected with the inflow branch 211, and the outlet of the heat exchange passage is connected with the return flow branch 221. Therefore, when the cooling medium is injected into the inflow pipe group 21, the cooling medium can flow into each heat exchange passage through a plurality of inflow branches 211 respectively, and the cooling medium in the heat exchange passage flows through the heat exchange channels in a plurality of energy storage units 11 in turn, and then flows out through a plurality of return flow branches 221 to the return flow pipe group 22, realizing cooling of each energy storage module.

[0037] In some optional embodiments, the number of energy storage units 11 included in each energy storage assembly 1 is equal.

[0038] By equalizing the number of energy storage units 11 included in each energy storage assembly 1 of the energy storage device, an equal number of heat exchange channels can be connected in series in each heat exchange passage, the flow resistance is more uniform, the uniform cooling of each energy storage unit 11 is realized, the maximum temperature of the energy storage system 10 is reduced, and the maximum temperature difference and pressure difference between each energy storage unit 11 of the energy storage system 10 are reduced, improving the consistency of the energy storage system 10.

[0039] It can be understood that, taking the energy storage device including 8 energy storage units 11 as an example, when each energy storage unit 11 is connected in parallel, 8 inflow branches 211 and 8 return flow branches 221 need to be set, and the number of branch pipelines for connecting 8 energy storage units 11 is 16 in total, and 8 parallel heat exchange passages are formed.

[0040] In this regard, the energy storage system 10 in the embodiments of the present application takes the example that each energy storage assembly 1 includes N energy storage units 11 (N is a positive integer and N≥2), and only 8 / N inlet flow branches 211, 8 / N switching pipelines 12 and 8 / N return flow branches 221 are required to be arranged, and the number of branch pipelines for connecting the 8 energy storage units 11 is 24 / N in total. Since the number of N is greater than or equal to 2, under the condition of the same number of energy storage units 11, the number of pipelines of the energy storage system 10 in the embodiments of the present application is less than the number of pipelines of the related art, so that the pipeline usage is reduced, and the pipeline cost is significantly reduced. Moreover, only 8 / N parallel heat exchange channels are formed, and under the condition of the same inlet flow, the flow rate of the cooling medium in the same heat exchange channel is increased to N times, so that the cooling efficiency can be improved, and the stability and reliability of the energy storage system 10 are improved.

[0041] It can be understood that although the more the number N of energy storage units 11 included in the energy storage assembly 1, the less the number of pipelines and the number of parallel heat exchange channels, but at the same time, the number of heat exchange flow channels in series in the heat exchange channel will also increase, and the flow resistance of the cooling medium will also increase accordingly, resulting in poor cooling effect of the energy storage unit 11. Therefore, the number N of energy storage units 11 included in the energy storage assembly 1 can be appropriately selected, so that the energy storage system 10 can reduce the pipeline cost while improving the cooling efficiency, thereby improving the reliability of the energy storage system 10.

[0042] In some optional embodiments, the number N of energy storage units 11 included in the energy storage assembly 1 is less than or equal to 3, so as to ensure the cooling effect of each energy storage unit 11 while reducing the pipeline cost and improving the cooling efficiency, thereby improving the reliability of the energy storage system 10.

[0043] Optionally, the number of energy storage units 11 included in the energy storage assembly 1 is 2.

[0044] When the energy storage device includes 8 energy storage units 11, the number of pipelines for connecting the 8 energy storage units 11 can be reduced from 16 in the related art to 12, which is reduced by 25%, the number of parallel heat exchange channels is reduced from 8 in the related art to 4, and the flow rate of the cooling medium in the same heat exchange channel is doubled. At the same time, the number of heat exchange flow channels in the same heat exchange channel is moderate, so as to ensure the cooling effect of each energy storage unit 11 while reducing the pipeline cost and improving the cooling efficiency, thereby improving the reliability of the energy storage system 10.

[0045] Optionally, the end of the inlet flow branch 211 and the return flow branch 221 can be provided with a quick connector, so as to connect the inlet flow branch 211 and the return flow branch 221 with the energy storage unit 11.

[0046] Please refer to Figures 1 to 3In some optional embodiments, the first switch 23 is arranged in the return pipe group 22 and the inlet pipe group 21, and is configured to control the opening and closing of the return pipe group 22 and the return branch 221, and control the opening and closing of the inlet pipe group 21 and the inlet branch 211.

[0047] By arranging the first switch 23 in the return pipe group 22 and the inlet pipe group 21, when the energy storage unit 11 needs to be repaired or replaced, the first switch 23 on both sides of the energy storage unit 11 can be closed to cut off the branch between the return pipe group 22 and the return branch 221, and the branch between the inlet pipe group 21 and the inlet branch 211, so as to remove the energy storage unit 11. During the removal of the energy storage unit 11, the energy storage units 11 of other heat exchange channels are not affected, thereby improving the availability of the energy storage system 10.

[0048] Optionally, the first switch 23 can be a three-way double-check valve, so that when the branch between the return pipe group 22 and the return branch 221, and the branch between the inlet pipe group 21 and the inlet branch 211 are cut off, the cut-off part can quickly form a self-seal to ensure that the liquid inside the pipeline does not flow out, and the energy storage unit 11 can be reliably repaired or replaced.

[0049] Please refer to Figures 1 to 4 , Figure 4 The structure of the adapter pipeline 12 provided by some embodiments of the present application is shown. In some optional embodiments, the second switch 24 is arranged on the adapter pipeline 12, and is used to control the opening and closing of the adapter pipeline 12.

[0050] By arranging the second switch 24 on the adapter pipeline 12, when a certain energy storage unit 11 needs to be repaired or replaced, the first switch 23 and the second switch 24 on both sides of the energy storage unit 11 can be directly closed to cut off the heat exchange channel in which the energy storage unit 11 is located, so as to remove the energy storage unit 11. The above removal process is more simple and convenient, reduces the risk of cooling medium leakage after cutting off, and improves the convenience and reliability of removing the energy storage unit 11.

[0051] Optionally, the second switch 24 is a straight-through double-check valve, so that when the adapter pipeline is closed, the cut-off part quickly forms a self-seal to ensure that the liquid inside the pipeline does not flow out, and the energy storage unit 11 can be reliably repaired or replaced.

[0052] Optionally, the end of the inlet branch 211, the adapter pipeline 12, and the return branch 221 used to connect the energy storage unit 11 can be provided with a smaller diameter corrugated pipe, and the assembly can be freely bent. The end of the corrugated pipe can be provided with a quick plug interface to realize quick plug connection with the energy storage unit 11, thereby improving the convenience of repairing or replacing the energy storage unit 11.

[0053] Referring to Figures 1 to 5 , Figure 5 Fig. 1 shows a structural schematic diagram of the main inflow pipe 212 and the main outflow pipe 222 provided by some embodiments of the present application.

[0054] In some alternative embodiments, the inflow pipe group 21 comprises the main inflow pipe 212 and the secondary inflow pipe 213 connected to the main inflow pipe 212, and the secondary inflow pipe 213 is provided with a plurality of inflow branches 211; the outflow pipe group 22 comprises the main outflow pipe 222 and the secondary outflow pipe 223 connected to the main outflow pipe 222, and the secondary outflow pipe 223 is provided with a plurality of outflow branches 221. The secondary inflow pipe 213 and the secondary outflow pipe 223 extend along the first direction Z and are oppositely arranged along the second direction X, and the plurality of energy storage assemblies 1 of the energy storage device are arranged at intervals along the first direction Z and are connected between the inflow branches 211 and the outflow branches 221 along the second direction X, and the first direction Z and the second direction X intersect.

[0055] The main inflow pipe 212 can serve as a primary pipe of the inflow pipe group 21, and the secondary inflow pipe 213 can serve as a secondary pipe of the inflow pipe group 21. The main outflow pipe 222 can serve as a primary pipe of the outflow pipe group 22, and the secondary outflow pipe 223 can serve as a secondary pipe of the outflow pipe group 22, and the energy storage device is connected between the secondary inflow pipe 213 and the secondary outflow pipe 223. The secondary inflow pipe 213 is provided with a plurality of inflow branches 211, and the inflow branches 211 can serve as tertiary pipes of the inflow pipe group 21. The secondary outflow pipe 223 is provided with a plurality of outflow branches 221, and the outflow branches 221 can serve as tertiary pipes of the outflow pipe group 22, and each energy storage assembly 1 of the energy storage device is connected between a pair of inflow branches 211 and outflow branches 221.

[0056] The cooling medium enters the secondary inflow pipe 213 from the main inflow pipe 212 to correspondingly achieve cooling and temperature reduction of the energy storage device. For the same energy storage device, the cooling medium entering the secondary inflow pipe 213 is branched into a plurality of inflow branches 211 to achieve cooling and temperature reduction of the energy storage units 11 of each energy storage assembly 1. After that, the cooling medium is converged by a plurality of outflow branches 221 to the secondary outflow pipe 223, and then flows out of the energy storage system 10 from the main outflow pipe 222.

[0057] Optionally, the first direction Z is a vertical direction, and the second direction X is a horizontal direction.

[0058] By extending the sub-inflow pipe 213 and the sub-return pipe 223 along the first direction Z and oppositely arranging them along the second direction X, the plurality of energy storage assemblies 1 of the energy storage device are arranged at intervals along the first direction Z and connected between the inflow branch 211 and the return branch 221 along the second direction X, so that the arrangement of the energy storage units 11 and the pipes in the energy storage system 10 is more reasonable and compact, the cooling efficiency is improved, and the consistency of the energy storage system 10 is improved.

[0059] In some optional embodiments, the third switch 25 is arranged on the main inflow pipe 212 and the main return pipe 222, and is used to control the on-off between the sub-inflow pipe 213 and the main inflow pipe 212 and the on-off between the sub-return pipe 223 and the main return pipe 222 in the energy storage device.

[0060] By arranging the third switch 25 on the main inflow pipe 212 and the main return pipe 222, when the energy storage device needs to be repaired or replaced, the third switch 25 on the main inflow pipe 212 and the main return pipe 222 can be directly closed to stop the injection of the cooling medium into the energy storage device, so that the removal of the energy storage device is more reliable. The above removal process is more simple and convenient, reduces the risk of cooling medium leakage after cutting off, and improves the convenience and reliability of removing the energy storage device.

[0061] Optionally, the third switch 25 can be a three-way switch valve.

[0062] Optionally, the main inflow pipe 212 and the sub-inflow pipe 213 are connected through a quick plug connector, and / or the main return pipe 222 and the sub-return pipe 223 are connected through a quick plug connector, so as to improve the efficiency of assembly and disassembly.

[0063] In some optional embodiments, the lower end of the sub-return pipe 223 along the first direction Z is connected to the main return pipe 222, and the upper end of the sub-return pipe 223 along the first direction Z is provided with an exhaust device 26. When gas is generated in the pipe, it can be discharged through the exhaust device 26. Specifically, the exhaust device 26 can be installed on any pipe that needs to be exhausted.

[0064] The cooling medium can be a liquid. By arranging the exhaust device 26 at the upper end of the sub-return pipe 223 along the first direction Z, the air in the energy storage system 10 can be discharged, so as to prevent the generation of air blockage and hinder the normal flow of the cooling medium and the efficient transfer of heat, and ensure the cooling efficiency of the energy storage system 10.

[0065] Optionally, the exhaust device 26 can be an exhaust valve.

[0066] Please refer to Figures 1 to 5In some optional embodiments, the main inflow pipe 212 is connected with multiple sub-inflow pipes 213, and the main outflow pipe 222 is connected with multiple sub-outflow pipes 223, and the sub-inflow pipes 213 and the sub-outflow pipes 223 are arranged in pairs.

[0067] By arranging multiple sub-inflow pipes 213 and multiple sub-outflow pipes 223, the cooling of multiple energy storage devices can be realized. It can be understood that, in the case that the number of inflow branches 211 on the sub-outflow pipes 223 is certain, only 1 / N sub-inflow pipes 213 and 1 / N sub-outflow pipes 223 are arranged, that is, the cooling of the same number of energy storage units 11 can be realized. For example, in the case that each energy storage assembly 1 includes two energy storage units 11, the number of sub-inflow pipes 213 and sub-outflow pipes 223, that is, the number of secondary pipes, can be reduced by 50%, further reducing the amount and cost of pipes.

[0068] Optionally, the main inflow pipe 212 and the main outflow pipe 222 can be arranged along the second direction X, so as to facilitate the arrangement of the multiple sub-inflow pipes 213 and the multiple sub-outflow pipes 223. The main inflow pipe 212 can include multiple sub-inflow pipes, and the multiple sub-inflow pipes are spliced to form the main inflow pipe 212 along the second direction X through the connecting pieces, so as to facilitate the manufacturing of the main inflow pipe 212 and reduce the cost.

[0069] Please refer to Figures 1 to 6 , Figure 6 A partial enlarged view of the thermal management device 2 of some embodiments of the present application is shown. In some optional embodiments, the thermal management device 2 includes at least two main inflow pipes 212 and at least two main outflow pipes 222 in parallel communication, and the number of the main inflow pipes 212 is arranged in pairs with the main outflow pipes 222. That is, by arranging at least two main inflow pipes 212 and main outflow pipes 222, the cooling of multiple energy storage devices can be realized.

[0070] Optionally, the main inflow pipe 212 and the main outflow pipe 222 are arranged along the third direction Y, and when the thermal management device 2 includes at least two main inflow pipes 212 and at least two main outflow pipes 222 in parallel communication, the multiple main inflow pipes 212 can be arranged along the third direction Y, and the multiple main outflow pipes 222 can be arranged along the third direction Y, and the third direction Y intersects the first direction Z and the second direction X, so as to facilitate the arrangement of the inflow pipe group 21 and the outflow pipe group 22.

[0071] Optionally, the inlet of the main inflow pipe 212 and the outlet of the main outflow pipe 222 are at the same end of the thermal management device 2 along the first direction Z, which is more convenient for liquid inflow and outflow, and forms a circulation.

[0072] In summary, the energy storage system 10 in the embodiments of the present application can form a cooling pipeline mode combining parallel connection and series connection by connecting the heat exchange flow channels of at least two energy storage units 11 in series through the adapter pipeline 12 and connecting the heat exchange passage in parallel between the inflow branch 211 and the return flow branch 221 through the inflow branch 211 and the return flow branch 221. Compared with the cooling pipeline mode in which each energy storage unit 11 is connected in parallel, taking the energy storage assembly 1 including two energy storage units 11 as an example, on the basis of cooling the same number of energy storage units 11, the amount of two-stage pipelines can be reduced by 50%, the amount of three-stage pipelines can be reduced by 25%, and the pipeline cost is significantly reduced. Moreover, on the basis of the energy storage device including the same number of energy storage units 11, the number of heat exchange passages connected in parallel can also be reduced, the flow rate of the cooling medium in the heat exchange passage is improved, the cooling efficiency is improved, the maximum temperature of the energy storage system 10 is significantly reduced, the maximum temperature difference and pressure difference of the energy storage system 10 are reduced, and the consistency of the battery system is improved.

[0073] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the application, and equivalent components thereof can be substituted. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage system, characterized in that, include: An energy storage device, comprising multiple energy storage components (1); A thermal management device (2) is used to exchange heat with the energy storage device. The thermal management device (2) includes an inlet pipe group (21) and a return pipe group (22). The inlet pipe group (21) includes multiple inlet branches (211), and the return pipe group (22) includes multiple return branches (221). The inlet branches (211) and the return branches (221) are arranged correspondingly. Multiple energy storage components (1) are respectively connected between the inlet branches (211) and the return branches (221). Each energy storage component (1) includes at least two energy storage units (11) and a transfer pipe (12). Each energy storage unit (11) includes a heat exchange channel. The heat exchange channels of adjacent energy storage units (11) within the same energy storage component (1) are connected through the transfer pipe (12).

2. The energy storage system according to claim 1, characterized in that, Each of the energy storage components (1) includes the same number of energy storage units (11).

3. The energy storage system according to claim 1, characterized in that, The number of energy storage units (11) included in the energy storage component (1) is less than or equal to 3.

4. The energy storage system according to claim 1, characterized in that, Both the return pipe group (22) and the inlet pipe group (21) are provided with a first switch (23). The first switch (23) is configured to control the connection and disconnection between the return pipe group (22) and the return branch (221), and to control the connection and disconnection between the inlet pipe group (21) and the inlet branch (211).

5. The energy storage system according to claim 4, characterized in that, A second switch (24) is provided on the transfer pipe (12), and the second switch (24) is used to control the on / off state of the transfer pipe (12).

6. The energy storage system according to claim 1, characterized in that, The inlet pipe assembly (21) includes a main inlet pipe (212) and a secondary inlet pipe (213) connected to the main inlet pipe (212). The secondary inlet pipe (213) is provided with a plurality of inlet branches (211). The return pipe assembly (22) includes a main return pipe (222) and a secondary return pipe (223) connected to the main return pipe (222). The secondary return pipe (223) is provided with a plurality of return branches (221). The secondary inlet pipe (213) and the secondary return pipe (223) extend along the first direction (Z) and are arranged opposite each other along the second direction (X). A plurality of energy storage components (1) of the energy storage device are arranged at intervals along the first direction (Z) and connected between the inlet branch (211) and the return branch (221) along the second direction (X). The first direction (Z) and the second direction (X) intersect.

7. The energy storage system according to claim 6, characterized in that, A third switch (25) is provided on both the main inlet pipe (212) and the main return pipe (222). The third switch (25) is used to control the connection and disconnection between the auxiliary inlet pipe (213) and the main inlet pipe (212) in the energy storage device, as well as to control the connection and disconnection between the auxiliary return pipe (223) and the main return pipe (222).

8. The energy storage system according to claim 6, characterized in that, The secondary return pipe (223) is connected to the main return pipe (222) at its lower end along the first direction (Z), and an exhaust device (26) is provided at the upper end of the secondary return pipe (223) along the first direction (Z).

9. The energy storage system according to claim 6, characterized in that, The main inlet pipe (212) is connected to multiple secondary inlet pipes (213), and the main return pipe (222) is connected to multiple secondary return pipes (223). The secondary inlet pipes (213) and the secondary return pipes (223) are arranged in pairs.

10. The energy storage system according to claim 6, characterized in that, The thermal management device (2) includes at least two parallel main inlet pipes (212) and at least two parallel main return pipes (222), wherein the main inlet pipes (212) and the main return pipes (222) are arranged in pairs.

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