Energy storage device and energy storage system

Abstract

The embodiment of the utility model provides an energy storage device and an energy storage system, relates to the technical field of energy storage, and is used for improving the refrigeration effect of battery packs in different areas in the energy storage device. The energy storage device comprises a shell, a plurality of battery clusters and a liquid cooling pipeline assembly. The battery clusters are located in the shell, each battery cluster comprises a plurality of battery packs arranged in a stacked mode in the first direction, and the liquid cooling pipeline assembly comprises a main liquid inlet pipeline, a plurality of branch liquid inlet pipelines and a first valve. The main liquid inlet pipeline comprises a liquid inlet and a liquid outlet. Each branch liquid inlet pipeline comprises a liquid inlet and a plurality of liquid outlets, and the liquid outlets of the branch liquid inlet pipelines are respectively communicated with cooling liquid inlets of different battery packs. The first valve comprises a first valve inlet and a plurality of first valve outlets, the first valve inlet is communicated with the liquid outlet of the main liquid inlet pipeline, the first valve outlets are communicated with the liquid inlets of the branch liquid inlet pipelines in a one-to-one mode, and the first valve is used for adjusting the flow of cooling liquid flowing out of the first valve outlets.

Description

TECHNICAL FIELD

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

[0002] In the process of charging and discharging, the battery packs in the battery cluster of the energy storage device (such as an energy storage box or an energy storage cabinet) generate a large amount of heat. In order to ensure that the operating temperature of the battery is within a suitable range, a liquid cooling method is usually used to cool the battery pack.

[0003] REFERENCE Figure 1 The flow direction of the liquid cooling medium of the energy storage device is generally as follows: from the main inlet pipe 11, through the battery cluster inlet pipe 13, the battery pack inlet pipe 15, the battery pack liquid cooling plate (not shown), the battery pack return pipe 16, the battery cluster return pipe 14 and the main return pipe 12, and then out through the main return pipe 12. In this arrangement, due to the flow resistance of the pipes, the flow rate of the liquid cooling medium gradually decreases along the arrangement direction of the plurality of battery clusters 20 (for example, as indicated by the P direction in the figure), and the refrigeration effect is poor, which leads to an increase in the temperature difference between the battery packs 30 in different regions of the energy storage device, which is not conducive to the operation of the energy storage device. Figure 1 The utility model discloses a liquid cooling system for energy storage device. SUMMARY

[0004] The present application provides an energy storage device and an energy storage system to improve the refrigeration effect of the battery packs in different regions of the energy storage device.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] In a first aspect of the present application, an energy storage device is provided, which comprises a housing, a plurality of battery clusters and a liquid cooling pipe assembly. The plurality of battery clusters are located in the housing, and each battery cluster comprises a plurality of battery packs stacked in a first direction. The liquid cooling pipe assembly comprises a main inlet pipe, a plurality of branch inlet pipes and a first valve. The main inlet pipe comprises an inlet and an outlet. Each branch inlet pipe comprises an inlet and a plurality of outlets, and the plurality of outlets of the branch inlet pipe are respectively communicated with the cooling liquid inlets of different battery packs. The first valve comprises a first valve inlet and a plurality of first valve outlets. The first valve inlet is communicated with the outlet of the main inlet pipe, and the plurality of first valve outlets are one-to-one communicated with the inlets of the plurality of branch inlet pipes. The first valve is used to adjust the flow rate of the cooling liquid flowing out of the plurality of first valve outlets.

[0007] In the energy storage device provided in the present application, the cooling liquid can flow into the main liquid inlet pipeline from the liquid inlet of the main liquid inlet pipeline, and flow into the first valve from the liquid outlet of the main liquid inlet pipeline. Under the regulation of the first valve, the cooling liquid flowing into the first valve can flow out from the multiple first valve outlets, and be transported to the multiple branch liquid inlet pipelines in one-to-one communication with the multiple first valve outlets, and be transported to the cooling liquid inlets of different battery packs from the multiple liquid outlets of the branch liquid inlet pipelines, and enter the battery packs through the cooling liquid inlets of the battery packs to cool the battery packs.

[0008] Since the first valve outlet of the first valve has multiple first valve outlets, and the multiple first valve outlets are in one-to-one communication with the liquid inlets of the multiple branch liquid inlet pipelines, by controlling the opening degree of the first valve, the flow of the cooling liquid entering the multiple branch liquid inlet pipelines can be distributed to adjust the temperature of the battery packs connected with the multiple branch liquid inlet pipelines. Compared with the series cooling mode of the prior art, the technical solution provided in the present application can cool the battery packs in the multiple battery clusters through the multiple branch liquid inlet pipelines, and can improve the refrigeration effect of the battery packs in the multiple battery clusters.

[0009] In some embodiments, the battery packs of the multiple battery clusters can be cooled by partitioning by arranging the positions of the multiple branch liquid inlet pipelines, thereby reducing the temperature difference between the battery packs in different regions. For example, the multiple battery packs of the multiple battery clusters are divided into multiple regions, such as region a, region b and region c. The multiple branch liquid inlet pipelines include multiple branch liquid inlet pipelines, such as branch liquid inlet pipeline a, branch liquid inlet pipeline b and branch liquid inlet pipeline c. The branch liquid inlet pipeline a is connected with the multiple battery packs in region a to transport cooling liquid to the multiple battery packs in region a. The branch liquid inlet pipeline b is connected with the multiple battery packs in region b to transport cooling liquid to the multiple battery packs in region b. The branch liquid inlet pipeline c is connected with the multiple battery packs in region c to transport cooling liquid to the multiple battery packs in region c. According to the temperature monitoring of region a, region b and region c, the flow of the cooling liquid flowing into the branch liquid inlet pipeline a, the branch liquid inlet pipeline b and the branch liquid inlet pipeline c can be distributed by controlling the opening degree of the first valve, so as to reduce the temperature difference between the battery packs in different regions, and make the temperature in the energy storage device more uniform.

[0010] In one embodiment, the multiple battery clusters are arranged at intervals along the second direction, the liquid cooling pipeline assembly is located on one side of the multiple battery clusters in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. In the first direction, the first valve is located at the middle position of the multiple battery clusters, and / or in the second direction, the first valve is located at the middle position of the multiple battery clusters.

[0011] Since the plurality of battery clusters are arranged at intervals along the second direction, and each battery cluster comprises a plurality of battery packs arranged in layers along the first direction. In the first direction, the first valve is located at the middle position of the plurality of battery clusters. It can be understood that when the battery packs arranged in layers along the first direction are even in number (such as four, eight, etc.), the first valve is located between the two middle battery packs in the even number of battery packs along the first direction. When the number of battery packs is odd (such as three, seven, etc.), the first valve is located at the middle battery pack in the odd number of battery packs along the first direction

[0012] In the second direction, the first valve is located at the middle position of the plurality of battery clusters. It can be understood that when the number of battery clusters is even (such as four, eight, etc.), the first valve is located between the two middle battery clusters in the even number of battery clusters along the second direction. When the number of battery clusters is odd (such as three, seven, etc.), the first valve is located at the middle battery cluster in the odd number of battery clusters along the second direction.

[0013] Since the cooling liquid is distributed into the plurality of branch liquid inlet pipelines through the first valve, and the first valve of the present application is located at the middle position of the plurality of battery clusters along the first direction, the cooling liquid can quickly enter the plurality of battery packs on both sides of the first direction, ensuring the cooling effect of each battery pack in the first direction. Compared with the liquid cooling mode of the prior art in which each battery cluster is connected in series, the present application can reduce the pipeline flow resistance from the first valve to the battery packs on both sides of the first direction, and improve the refrigeration effect of the battery packs on both sides of the first direction.

[0014] Along the second direction, the first valve of the present application is located at the middle position of the plurality of battery clusters, which can make the cooling liquid quickly enter the plurality of battery packs on both sides of the second direction, ensuring the cooling effect of each battery pack in the second direction. Compared with the liquid cooling mode of the prior art in which the plurality of battery clusters are connected in series, the present application can reduce the pipeline flow resistance from the first valve to the battery clusters on both sides of the second direction, and improve the refrigeration effect of the battery packs in the battery clusters on both sides of the second direction.

[0015] By locating the first valve at the middle position of the plurality of battery clusters, the plurality of branch liquid inlet pipelines can cool the plurality of battery clusters in a more uniform manner. It also facilitates the connection and maintenance of the first valve and the plurality of branch liquid inlet pipelines, reducing the difficulty and cost of maintenance.

[0016] In an embodiment, part of the plurality of branch liquid inlet pipelines is provided with a second valve, and the second valve comprises a plurality of second valve outlets. The part of the plurality of branch liquid inlet pipelines comprises a plurality of liquid inlet branches, and each liquid inlet branch comprises a liquid inlet port and a plurality of liquid outlet ports. The plurality of second valve outlets are in one-to-one communication with the liquid inlet ports of the plurality of liquid inlet branches, and the plurality of liquid outlet ports of the liquid inlet branch are in communication with the cooling liquid inlets of different battery packs. The second valve is used to adjust the flow of the cooling liquid flowing out of the plurality of second valve outlets.

[0017] The second valve is arranged on part of the branch liquid inlet pipelines, and the part of the branch liquid inlet pipelines comprises the liquid inlet branch, so that the cooling liquid flowing into the part of the branch liquid inlet pipelines can flow into the plurality of liquid inlet branches through the second valve. Since the plurality of liquid outlets of the liquid inlet branch are in communication with the cooling liquid inlets of different battery packs, the plurality of battery clusters can be divided into different zones by arranging the positions of the plurality of liquid inlet branches, so as to adjust the temperature of the battery packs in the plurality of battery clusters in different zones and reduce the temperature difference between the battery packs in different zones.

[0018] Compared with the mode of realizing the zone cooling only by the first valve and the plurality of branch liquid inlet pipelines, when cooling the same number of zones, the second valve and the plurality of liquid inlet branches arranged on part of the branch liquid inlet pipelines can reduce the number of valve channel outlets of the first valve, on the one hand, can reduce the difficulty of valve channel design of the first valve, reduce the manufacturing cost and reduce the difficulty of pipeline connection, on the other hand, can also reduce the difficulty of controlling the first valve to adjust the flow of the cooling liquid flowing out of the plurality of first valve outlets, facilitate control and reduce control cost.

[0019] In an embodiment, the first valve and the second valve are arranged along a first direction, and the second valve is closer to the bottom of the shell than the first valve.

[0020] The first valve and the second valve are arranged along the first direction, which can facilitate the pipeline connection between the first valve and the second valve.

[0021] In some embodiments, the second valve is closer to the bottom of the shell than the first valve. Since the impurities carried by the cooling liquid during transportation are prone to accumulate in the pipeline, the second valve is closer to the bottom of the shell than the first valve, which can facilitate subsequent maintenance and cleaning and reduce the difficulty of maintenance.

[0022] In an embodiment, the first valve is a four-way valve; and / or, the second valve is a three-way valve.

[0023] Compared with the first valve being a five-way valve or a valve with more than five ways, by arranging the first valve to be a four-way valve, on the one hand, the difficulty of valve channel design of the first valve can be reduced, the manufacturing cost can be reduced, and the difficulty of pipeline connection can be reduced, on the other hand, the difficulty of controlling the first valve to adjust the flow of the cooling liquid flowing out of the plurality of first valve outlets can be reduced, the control can be facilitated, and the control cost can be reduced.

[0024] Compared with the second valve being a four-way valve or a valve with more than four ways, by setting the second valve as a three-way valve, on one hand, the valve channel design difficulty of the second valve can be reduced, the manufacturing cost can be reduced, and the pipeline connection difficulty can be reduced, on the other hand, the difficulty of controlling the flow of the cooling liquid flowing out of the multiple second valve outlets can be reduced, the control can be facilitated, and the control cost can be reduced.

[0025] In an implementation, the branch liquid inlet pipeline includes a first liquid inlet pipe section and a second liquid inlet pipe section in communication. The branch liquid inlet pipeline includes a first liquid inlet pipe section and a second liquid inlet pipe section in communication. The second liquid inlet pipe section includes multiple liquid outlet openings arranged at intervals along a first direction, and the multiple liquid outlet openings of the second liquid inlet pipe section are respectively in communication with the cooling liquid inlets of different battery packs. The second liquid inlet pipe section extends along the first direction, and the extension direction of the first liquid inlet pipe section, the extension direction of the second liquid inlet pipe section, and the opening direction of the cooling liquid inlets of the battery packs are perpendicular to each other.

[0026] Since the multiple battery packs in each battery cluster are stacked along the first direction, the cooling liquid inlets of the multiple battery packs in each battery cluster are also arranged at intervals along the first direction. By arranging the multiple liquid outlet openings of the second liquid inlet pipe section at intervals along the first direction, the multiple liquid outlet openings of the second liquid inlet pipe section can be respectively in communication with the cooling liquid inlets of different battery packs.

[0027] The second liquid inlet pipe section extends along the first direction, and the extension direction of the first liquid inlet pipe section, the extension direction of the second liquid inlet pipe section, and the opening direction of the cooling liquid inlets of the battery packs are perpendicular to each other. In this way, the multiple pipe sections can be distributed in an orderly manner, facilitating the connection between the pipe sections and subsequent maintenance.

[0028] In an implementation, the liquid cooling pipeline assembly further includes a main liquid return pipeline and multiple branch liquid return pipelines. The main liquid return pipeline includes a liquid inlet and a liquid outlet. The liquid outlets of the multiple branch liquid return pipelines are respectively in communication with the main liquid return pipeline. The multiple branch liquid inlet pipelines include multiple cluster liquid outlets connected to part of the battery packs in the same battery cluster in the multiple battery clusters, and the multiple cluster liquid outlets are respectively in communication with the cooling liquid inlets of different battery packs in the same battery cluster. The multiple branch liquid return pipelines include multiple cluster liquid inlets connected to part of the battery packs in the same battery cluster, and the multiple cluster liquid inlets are respectively in communication with the cooling liquid outlets of different battery packs in the same battery cluster. In the same battery cluster, the battery packs connected by the multiple cluster liquid inlets and the battery packs connected by the multiple cluster liquid outlets are the same.

[0029] In the same battery cluster, the cooling liquid of the branch liquid return pipeline is transported to the cooling liquid inlets of part of the battery packs in the same battery cluster through the multiple cluster liquid outlets. After heat exchange in the battery packs, the cooling liquid enters the multiple cluster liquid outlets from the cooling liquid outlets of the battery packs, and is transported to the main liquid return pipeline through the branch liquid return pipeline and the multiple cluster liquid outlets.

[0030] The battery packs connected by the plurality of cluster liquid inlet ports and the plurality of cluster liquid outlet ports are the same, which is more conducive to the partition cooling of the plurality of battery packs in the same battery cluster. Due to the partition cooling of the plurality of battery packs, the cooling liquid flowing from different areas has different temperatures. If the battery packs connected by the plurality of cluster liquid inlet ports and the plurality of cluster liquid outlet ports are different, the cooling liquid flowing into the branch liquid return pipeline from the cluster liquid inlet port in one area may enter the battery pack through the cluster liquid inlet port in another area, thereby affecting the cooling effect of the battery pack. Therefore, the scheme provided in the present application can ensure the cooling effect of the plurality of battery packs.

[0031] In an embodiment, the plurality of branch liquid inlet pipelines are closer to the plurality of battery clusters than the plurality of branch liquid return pipelines, and / or the main liquid inlet pipeline is closer to the plurality of battery clusters than the main liquid return pipeline.

[0032] Since the plurality of branch liquid inlet pipelines and the main liquid inlet pipeline are used to provide cooling liquid to the battery packs in the plurality of battery clusters, by arranging the plurality of branch liquid inlet pipelines to be closer to the plurality of battery clusters than the plurality of branch liquid return pipelines, the distance between the plurality of branch liquid inlet pipelines and the battery packs can be reduced, thereby reducing the length of the pipeline connecting the branch liquid inlet pipeline and the cooling liquid inlet of the battery pack. In this way, the flow path of the cooling liquid is shortened. Therefore, the cooling liquid can quickly enter the battery pack and cool the battery pack, thereby improving the heat dissipation efficiency of the battery pack, preventing the temperature of the cooling liquid from rising due to heat exchange with the external environment, and thereby reducing the cooling efficiency of the battery pack.

[0033] By arranging the main liquid inlet pipeline to be closer to the plurality of battery clusters than the main liquid return pipeline, the distance between the main liquid return pipeline and the battery packs can be reduced, and the flow path of the cooling liquid to the cooling liquid inlet of the battery pack can also be shortened. Therefore, the cooling liquid can quickly enter the battery pack and cool the battery pack, thereby improving the heat dissipation efficiency of the battery pack, preventing the temperature of the cooling liquid from rising due to heat exchange with the external environment, and thereby reducing the cooling efficiency of the battery pack.

[0034] In some embodiments, the plurality of branch liquid inlet pipelines are closer to the plurality of battery clusters than the plurality of branch liquid return pipelines, and the main liquid inlet pipeline is closer to the plurality of battery clusters than the main liquid return pipeline, which facilitates the connection of the main liquid inlet pipeline and the plurality of branch liquid inlet pipelines, and the connection of the main liquid return pipeline and the plurality of branch liquid return pipelines, and facilitates subsequent maintenance and replacement.

[0035] In an embodiment, the plurality of branch liquid inlet pipelines and the plurality of branch liquid return pipelines are arranged in a staggered manner, and / or the main liquid inlet pipeline and the main liquid return pipeline are arranged in a staggered manner.

[0036] The plurality of branch liquid inlet pipelines and the plurality of branch liquid return pipelines are arranged in a staggered manner, which can facilitate the connection of the plurality of branch liquid inlet pipelines and the plurality of branch liquid return pipelines with the battery packs in the plurality of battery clusters, reduce the length of the connecting pipelines between the branch liquid inlet pipelines and the battery pack cooling liquid inlets, and reduce the length of the connecting pipelines between the branch liquid return pipelines and the battery pack cooling liquid outlets, which is conducive to reducing the cost and weight, and through the staggered arrangement, the size of the energy storage device in the third direction can also be reduced, which is conducive to the miniaturization and light weight of the energy storage device.

[0037] The main liquid inlet pipeline and the main liquid return pipeline are arranged in a staggered manner, which can facilitate the connection of the main liquid inlet pipeline with the plurality of branch liquid inlet pipelines, and the connection of the main liquid return pipeline with the plurality of branch liquid return pipelines. Through the staggered arrangement, the size of the energy storage device in the third direction can also be reduced, which is conducive to the miniaturization and light weight of the energy storage device.

[0038] In an embodiment, the branch liquid return pipeline includes a first branch liquid return pipeline segment and a second branch liquid return pipeline segment in communication. The second branch liquid return pipeline segment includes a plurality of liquid inlet openings arranged at intervals along the first direction, and the plurality of liquid inlet openings of the second branch liquid return pipeline segment are in communication with the cooling liquid outlets of different battery packs, respectively. The second branch liquid return pipeline segment extends along the first direction, and the extension direction of the second branch liquid return pipeline segment, the extension direction of the first branch liquid return pipeline segment, and the opening direction of the cooling liquid outlets of the battery packs are perpendicular to each other.

[0039] Since the plurality of battery packs in each battery cluster are arranged in a stacked manner along the first direction, the cooling liquid outlets of the plurality of battery packs in each battery cluster are also arranged at intervals along the first direction. By arranging the plurality of liquid inlet openings of the second liquid return pipeline segment at intervals along the first direction, the plurality of liquid inlet openings of the second liquid return pipeline segment can be in communication with the cooling liquid outlets of different battery packs, respectively.

[0040] The second liquid return pipeline segment extends along the first direction, and the extension direction of the first liquid return pipeline segment, the extension direction of the second liquid return pipeline segment, and the opening direction of the cooling liquid outlets of the battery packs are perpendicular to each other. Such an arrangement can make the plurality of pipeline segments distribute in an orderly manner, which is conducive to the connection between the pipeline segments and subsequent maintenance.

[0041] In an embodiment, the liquid cooling pipeline assembly further includes a first joint, the first joint includes a first outlet and a plurality of first inlets, the plurality of first inlets are in communication with the first outlet, respectively, the first outlet is in communication with the liquid inlet opening of the main liquid return pipeline, and the plurality of first inlets are in one-to-one communication with the liquid outlet openings of the plurality of branch liquid return pipelines.

[0042] Since the first joint has multiple first inlets, and the multiple first inlets are in one-to-one communication with the multiple liquid outlet ports of the multiple branch liquid return pipelines, through the first joint, the cooling liquid flowing out of the branch liquid return pipelines can quickly enter the main liquid return pipeline and then flow out of the liquid cooling pipeline assembly.

[0043] In an implementation manner, the second joint is arranged on part of the multiple branch liquid return pipelines, and the second joint includes multiple second inlets. The part of the multiple branch liquid return pipelines further includes multiple liquid return branches, each of which is provided with a liquid outlet port and multiple liquid inlet ports. The liquid outlet ports of the multiple liquid return branches are in one-to-one communication with the multiple second inlets, and the multiple liquid inlet ports of the liquid return branches are respectively in communication with the cooling liquid outlet ports of different battery packs.

[0044] By arranging the second joint on part of the multiple branch liquid return pipelines, and making the part of the multiple branch liquid return pipelines include the liquid return branches, the cooling liquid flowing into the liquid return branches can flow to the first joint through the second joint, and then flow to the main liquid return pipeline through the first joint. Since the multiple liquid inlet ports of the liquid return branches are respectively in communication with the cooling liquid outlet ports of different battery packs.

[0045] Compared with the liquid return mode through only the first joint and the multiple branch liquid return pipelines, by arranging the second joint and the multiple liquid return branches on part of the multiple branch liquid return pipelines, the structure of the first joint can be simplified, the internal flow channel design difficulty of the first joint can be reduced, the manufacturing cost can be reduced, and the pipeline connection difficulty can be reduced.

[0046] In a second aspect, the application provides an energy storage system, which comprises a power conversion device and the energy storage device described above. The power conversion device is connected with the energy storage device to perform power conversion on the current input to or output from the energy storage device.

[0047] In some embodiments, the input end of the energy storage device is connected with the output end of the power conversion device. The power conversion device can perform power conversion on the current input to the energy storage device to realize energy storage of the energy storage device.

[0048] In some embodiments, the output end of the energy storage device is connected with the input end of the power conversion device, and the output end of the power conversion device is connected with an electrical load. The power conversion device can perform power conversion on the current output from the energy storage device to provide electrical energy to the electrical load.

[0049] The energy storage system provided by the application comprises the energy storage device described above, so the energy storage system provided by the application and the energy storage device of the technical solution described above can solve the same technical problems and have the same technical effects, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1A partial structure schematic diagram of an energy storage device in the prior art;

[0051] Figure 2 A structure schematic diagram of an energy storage system provided by an embodiment of the present application;

[0052] Figure 3 A partial structure schematic diagram of an energy storage device provided by an embodiment of the present application;

[0053] Figure 4 A partial structure block diagram of a liquid cooling circuit of an energy storage device provided by an embodiment of the present application;

[0054] Figure 5 A partial structure schematic diagram of an energy storage device provided by an embodiment of the present application;

[0055] Figure 6 A partial structure schematic diagram of a liquid cooling pipe assembly in Figure 5 ;

[0056] Figure 7 A partial exploded view of a liquid cooling pipe assembly in Figure 6 ;

[0057] Figure 8 A partial structure schematic diagram of a first valve in Figure 7 ;

[0058] Figure 9 A partial structure schematic diagram of a second valve in Figure 7 ;

[0059] Figure 10 A partial structure schematic diagram of an energy storage device provided by an embodiment of the present application;

[0060] Figure 11 A partial structure schematic diagram of a liquid cooling pipe assembly in Figure 5 ;

[0061] Figure 12 A partial exploded view of a liquid cooling pipe assembly in Figure 11 ;

[0062] Figure 13 A partial structure schematic diagram of an energy storage device provided by an embodiment of the present application;

[0063] Figure 14 A partial structure schematic diagram of an energy storage device provided by an embodiment of the present application;

[0064] Figure 15 A control logic schematic diagram of an energy storage device provided by an embodiment of the present application.

[0065] Reference signs:

[0066] 1000 - energy storage system; 100 - energy storage device; 200 - power conversion device; 201 - first power converter; 202 - second power converter; 2000 - power consumption load; 2001 - refrigerator; 2002 - power grid; 3000 - photovoltaic power generation system;

[0067] 10 - shell; 101 - battery cavity; 102 - liquid cooling cavity; 20 - battery cluster; 30 - battery pack; 301 - cooling liquid inlet; 302 - cooling liquid outlet; 40 - liquid cooling unit; 4011 - first liquid inlet; 4012 - first liquid outlet; 402 - heat exchanger; 403 - water pump; 404 - condenser; 405 - compressor; 406 - expansion valve; 50 - liquid cooling pipeline assembly;

[0068] 11 - main liquid inlet pipeline; 111 - second liquid inlet; 112 - second liquid outlet

[0069] 12 - main liquid return pipeline; 121 - third liquid inlet; 122 - third liquid outlet;

[0070] 13 - battery cluster liquid inlet pipeline; 14 - battery cluster liquid return pipeline; 15 - battery pack liquid inlet pipeline; 16 - battery pack liquid return pipeline;

[0071] 2 - branch liquid inlet pipeline; 21 - first branch liquid inlet pipeline; 22 - second branch liquid inlet pipeline; 23 - third branch liquid inlet pipeline;

[0072] 231 - liquid inlet branch; 2311 - first liquid inlet branch; 2312 - second liquid inlet branch; 232 - first connecting pipeline;

[0073] 211 - fourth liquid inlet; 212 - fourth liquid outlet; 2121 - cluster liquid outlet; 213 - first liquid inlet pipe section; 214 - second liquid inlet pipe section;

[0074] 3 - branch liquid return pipeline; 31 - first branch liquid return pipeline; 32 - second branch liquid return pipeline; 33 - third branch liquid return pipeline; 331 - liquid return branch; 3311 - first liquid return branch; 3312 - second liquid return branch; 332 - second connecting pipeline;

[0075] 311 - fifth liquid inlet; 3111 - cluster liquid inlet; 312 - fifth liquid outlet; 313 - first liquid return pipe section; 314 - second liquid return pipe section;

[0076] 4 - first valve; 41 - first valve inlet; 42 - first valve outlet; 421 - first valve inlet a; 422 - first valve inlet b; 423 - first valve inlet c;

[0077] 5 - second valve; 51 - second valve inlet; 52 - second valve outlet; 521 - second valve outlet a; 521 - second valve outlet b;

[0078] 6 - first joint; 61 - first inlet; 62 - first outlet;

[0079] 7 - second joint; 71 - second inlet; 72 - second outlet. DETAILED DESCRIPTION

[0080] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application.

[0081] In the present application, unless specifically defined and limited otherwise, the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right" and the like can include, but is not limited to, the orientation defined by the relative placement of the components in the drawings, wherein these directional terms can be relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the placement of the components in the drawings, and cannot be understood as a limitation on the present application.

[0082] In the present application, the terms "first", "second" and the like are only for descriptive purposes, and are used to distinguish one element from another element, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features.

[0083] In the present application, unless specifically defined and limited otherwise, the meaning of "multiple" is two or more.

[0084] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. 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. In addition, when describing pipelines or channels, the "connecting" and "connection" used in the present application have the meaning of conducting. The specific meaning needs to be understood in combination with the context.

[0085] In addition, in the present application, the word "exemplary" or "for example" is used to mean serving as an example, instance, or illustration. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be construed as being more suitable, advantageous, or any more preferred over other embodiments or design solutions. In fact, a word or phrase, such as "exemplary" or "for example", is used in the present application to present related concepts in a concrete manner.

[0086] In the drawings of the embodiments of the present application, the entity structures of components, assemblies, etc. are represented by guide lines; the hollow structures such as openings, holes, spaces, cavities, etc. are represented by guide lines with arrows.

[0087] The energy storage system provided by the embodiments of the present application can be applied to various charging and discharging scenarios, such as power stations, charging stations, household use, etc. The energy storage system provided by the present application can be used to provide electric energy for various electric load, and can be used together with power generation systems such as photovoltaic power generation systems and wind power generation systems to store electric energy, realize energy transfer, improve the operation stability of the whole system, and improve the power quality. The energy storage system provided by the present application can include energy storage of different types of batteries, which can include lithium ion batteries, lead-acid batteries (or lead-acid storage batteries), etc. The specific type of battery is not limited in the present application.

[0088] Figure 2 The energy storage system provided by the embodiments of the present application is shown in a structural schematic diagram. Referring to Figure 2 , the energy storage system 1000 includes a power conversion device 200 and an energy storage device 100. The power conversion device 200 is connected with the energy storage device 100 to perform power conversion on the current input to or output from the energy storage device 100.

[0089] Referring to Figure 2 , the power conversion device 200 includes a first power converter 201 and a second power converter 202. The input end of the energy storage device 100 is connected with the output end of the second power converter 202, and the second power converter 202 can perform power conversion on the current input to the energy storage device 100. The output end of the energy storage device 100 is connected with the first power converter 201, and the first power converter 201 can perform power conversion on the current output from the energy storage device 100.

[0090] In the energy storage system 1000 given in Figure 2 , the first power converter 201 can have various forms. For example, in some embodiments, referring to Figure 2The first power converter 201 is a direct current (DC)-alternating current (AC) converter, i.e., a DC-AC converter. The output end of the first power converter 201 is connected to the power consumption load 2000. The DC power output from the energy storage device 100 is transmitted to the first power converter 201. The first power converter 201 can convert the DC power output from the energy storage device 100, i.e., the DC power input to the first power converter 201, into AC power. The AC power output from the first power converter 201 is transmitted to the power consumption load 2000 to supply AC power to the power consumption load 2000.

[0091] In this embodiment, the power consumption load 2000 connected to the first power converter 201 can have various forms and quantities. For example, the first power converter 201 is connected to a refrigerator 2001 and a power grid 2002 respectively to supply AC power to the refrigerator 2001 and the power grid 2002. The present application does not specially limit this.

[0092] For another example, in some other embodiments, the first power converter 201 can be a DC-DC converter. The first power converter 201 can convert the DC power output from the energy storage device 100, i.e., the DC power input to the first power converter 201, into DC power having a different voltage value to supply DC power to the power consumption load 2000.

[0093] In this embodiment, the power consumption load 2000 connected to the first power converter 201 can have various forms and quantities. For example, the first power converter 201 is connected to a battery to supply DC power to the battery. The present application does not specially limit this.

[0094] In Figure 2 The second power converter 202 can have various forms. For example, in some embodiments, referring to Figure 2 The second power converter 202 is a direct current-direct current converter, i.e., a DC-DC converter. The input end of the second power converter 202 is connected to the photovoltaic power generation system 3000. The DC power output from the photovoltaic power generation system 3000 is transmitted to the second power converter 202. The second power converter 202 can convert the DC power output from the photovoltaic power generation system 3000 to the second power converter 202 into DC power having a different voltage value. The DC power output from the second power converter 202 is transmitted to the energy storage device 100 to realize energy storage of the energy storage device 100.

[0095] For another example, in some other embodiments, the second power converter 202 can be an AC-DC converter. The second power converter 202 can convert the AC power output from the photovoltaic power generation system 3000 to the second power converter 202 into DC power.

[0096] In other embodiments of the present application, the second power converter 202 can also be connected to other forms of power generation systems, such as wind power generation systems, hydroelectric power generation systems, nuclear power generation systems, or thermal power generation systems, etc. The present application does not make specific limitations on the specific form of the power generation system.

[0097] Figure 3 A partial structure schematic diagram of an energy storage device provided in an embodiment of the present application is shown in FIG. 1. Referring to FIG. 1, the energy storage device 100 includes a housing 10, a plurality of battery clusters 20, and a liquid cooling pipe assembly 50. The plurality of battery clusters 20 and the liquid cooling pipe assembly 50 are located in the housing 10. Figure 3 By providing the housing 10, on the one hand, the plurality of battery clusters 20 and the liquid cooling pipe assembly 50 can be provided with an external barrier, reducing the possibility of impurities such as dust and liquid entering the battery clusters 20 and the liquid cooling pipe assembly 50, and preventing the battery clusters 20 and the liquid cooling pipe assembly 50 from being damaged by external forces. On the other hand, the appearance of the energy storage device 100 can be improved.

[0098] Referring to FIG. 1, each battery cluster 20 includes a plurality of battery packs 30 stacked along a first direction. The plurality of battery clusters 20 are spaced apart along a second direction. The liquid cooling pipe assembly 50 is disposed on one side of the plurality of battery clusters 20 in a third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0099] Figure 3 The first direction, the second direction, and the third direction can each have multiple forms. For example, in some embodiments, referring to FIG. 1, the first direction is the height direction of the housing 10, the second direction is the length direction of the housing 10, and the third direction is the width direction of the housing 10. For another example, in some embodiments, the first direction is the length direction of the housing 10, the second direction is the height direction of the housing 10, and the third direction is the width direction of the housing 10. The present application does not make specific limitations on this, and those skilled in the art can selectively design according to actual needs.

[0100] Figure 3 Referring to FIG. 1, the energy storage device 100 further includes a liquid cooling unit 40 located in the housing 10. The liquid cooling unit 40 is connected to the plurality of battery clusters 20 through the liquid cooling pipe assembly 50 to form a liquid cooling loop.

[0101] Referring to FIG. 1, the energy storage device 100 further includes a liquid cooling unit 40 located in the housing 10. The liquid cooling unit 40 is connected to the plurality of battery clusters 20 through the liquid cooling pipe assembly 50 to form a liquid cooling loop. Figure 3

[0102] ​​​The cooling liquid flowing out of the liquid cooling unit 40 can flow into the battery packs 30 in the plurality of battery clusters 20 (for example, into the liquid cooling plates of the battery packs) through the liquid cooling pipeline assembly 50 to absorb the heat generated by the battery packs 30, so as to reduce the temperature of the battery packs 30 and the battery clusters 20. The cooling liquid after absorbing the heat can flow back to the liquid cooling unit 40 through the liquid cooling pipeline assembly 50, and the liquid cooling unit 40 can cool the cooling liquid flowing into the liquid cooling unit 40. The cooled cooling liquid flows into the battery packs 30 again through the liquid cooling pipeline assembly 50 to circulate in the liquid cooling loop.

[0103] In some embodiments, the shell 10 includes a battery cavity 101 and a liquid cooling cavity 102 arranged adjacent in the second direction, the plurality of battery clusters 20 and the liquid cooling pipeline assembly 50 are located in the battery cavity 101, and the liquid cooling unit 40 is located in the liquid cooling cavity 102. By separating the liquid cooling unit 40 and the plurality of battery clusters 20, the mutual influence between the two can be reduced. For example, the separation design can prevent the heat generated by the battery clusters 20 from affecting the operating efficiency of the liquid cooling unit 40. In addition, the battery clusters 20 may

[0104] Figure 4 A partial structure block diagram of a liquid cooling loop of an energy storage device is provided for embodiments of the present application. Referring to Figure 4 The liquid cooling unit 40 includes a heat exchanger 402 (for example, a refrigerator, etc.), a first liquid inlet 4011, and a first liquid outlet 4012. The heat exchanger 402 is in communication with the first liquid inlet 4011 through a pipeline, and the heat exchanger 402 is in communication with the first liquid outlet 4012 through a pipeline.

[0105] Referring to Figure 4 The liquid cooling pipeline assembly 50 includes a second liquid inlet 111 and a third liquid outlet 122. The second liquid inlet 111 is in communication with the first liquid outlet 4012, and the third liquid outlet 122 is in communication with the first liquid inlet 4011. The cooling liquid flows from the first liquid outlet 4012 into the second liquid inlet 111, and flows into the battery packs 30 in the plurality of battery clusters 20 through the liquid cooling pipeline assembly 50 to exchange heat with the battery packs 30 to take away the heat of the battery packs 30. The cooling liquid after exchanging heat with the battery packs 30 passes through the third liquid outlet 122 of the liquid cooling pipeline assembly 50, and then enters the heat exchanger 402 through the first liquid inlet 4011. The heat exchanger 402 can cool the cooling liquid flowing through the heat exchanger 402 to reduce the temperature of the cooling liquid, and the cooled cooling liquid is transported into the liquid cooling pipeline assembly 50 through the first liquid outlet 4012.

[0106] In some embodiments, in order to facilitate the delivery of the cooling liquid to the first liquid outlet 4012, the liquid cooling unit 40 further comprises a water pump 403, which pumps the cooling liquid to the first liquid outlet 4012, thereby increasing the flow rate of the cooling liquid into the liquid cooling pipeline assembly 50, and in the same time, more cooling liquid can be used to take away the heat of the battery pack, thereby improving the cooling effect of the battery pack.

[0107] In Figure 4 In the embodiment given, the liquid cooling unit 40 further comprises a condenser 404, a compressor 405 and an expansion valve 406. The heat exchanger 402, the compressor 405, the condenser 404 and the expansion valve 406 are sequentially connected end to end to form a loop for the circulation of the refrigerant. The compressor 405 can compress the low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, which is delivered to the condenser 404, where it releases heat and cools down to become liquid. The liquid refrigerant is throttled by the expansion valve 406 to form low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant is delivered to the heat exchanger 402, where it exchanges heat with the cooling liquid to take away the heat of the cooling liquid and evaporate into gas. The low-temperature and low-pressure gaseous refrigerant is sent to the compressor 405 for the next refrigeration cycle.

[0108] The structure, working principle and connection mode of the above-mentioned condenser 404, compressor 405, expansion valve 406 and heat exchanger 402 are well known to those skilled in the art, and will not be described here.

[0109] In other embodiments of the present application, the liquid cooling unit 40 can further comprise other structures such as fans, etc., which are not specially limited in the present application and can be selectively designed by those skilled in the art according to actual needs.

[0110] Figure 5 A partial structure schematic view of a power storage device according to an embodiment of the present application. Referring to Figure 5 The liquid cooling pipeline assembly 50 comprises a main liquid inlet pipeline 11, a first valve 4 and a plurality of branch liquid inlet pipelines 2. The main liquid inlet pipeline 11 communicates with the plurality of branch liquid inlet pipelines 2 through the first valve 4.

[0111] Referring to Figure 5 The liquid cooling pipeline assembly 50 further comprises a main liquid return pipeline 12, a first joint 6 and a plurality of branch liquid return pipelines 3. The main liquid return pipeline 12 communicates with the plurality of branch liquid return pipelines 3 through the first joint 6.

[0112] In the embodiments given in the present application, the main liquid inlet pipeline 11 and the plurality of branch liquid inlet pipelines 2 are used to supply the battery packs in the plurality of battery clusters 20 with cooling liquid. The cooling liquid that exchanges heat with the battery packs is transported to the liquid cooling unit 40 through the main liquid return pipeline 12 and the plurality of branch liquid return pipelines 3. In order to improve the heat exchange efficiency, in some embodiments, referring to Figure 3 and Figure 5 , the plurality of branch liquid inlet pipelines 2 are closer to the plurality of battery clusters 20 than the plurality of branch liquid return pipelines 3, which can reduce the distance between the plurality of branch liquid inlet pipelines 2 and the battery packs, and reduce the length of the pipeline connecting the branch liquid inlet pipeline 2 and the cooling liquid inlet 301 of the battery pack. In this way, the flow path of the cooling liquid is shortened. Therefore, the cooling liquid can quickly enter the battery pack and cool the battery pack, so as to improve the heat dissipation efficiency of the battery pack, prevent the temperature of the cooling liquid from rising due to heat exchange with the external environment, and thus reduce the cooling efficiency of the battery pack.

[0113] By arranging the main liquid inlet pipeline 11 closer to the plurality of battery clusters 20 than the main liquid return pipeline 12, the distance between the main liquid return pipeline 12 and the battery pack 30 can be reduced, and the flow path of the cooling liquid to the cooling liquid inlet 301 of the battery pack can be shortened. Therefore, the cooling liquid can quickly enter the battery pack 30 and cool the battery pack 30, so as to improve the heat dissipation efficiency of the battery pack 30, prevent the temperature of the cooling liquid from rising due to heat exchange with the external environment, and thus reduce the cooling efficiency of the battery pack 30.

[0114] In some embodiments, the plurality of branch liquid inlet pipelines 2 are closer to the plurality of battery clusters 20 than the plurality of branch liquid return pipelines 3, and the main liquid inlet pipeline 11 is closer to the plurality of battery clusters 20 than the main liquid return pipeline 12, which can facilitate the connection of the main liquid inlet pipeline 11 and the plurality of branch liquid inlet pipelines 2, and the connection of the main liquid return pipeline 12 and the plurality of branch liquid return pipelines 3, and facilitate subsequent maintenance and replacement.

[0115] In some embodiments, referring to Figure 3 and Figure 5 , the plurality of branch liquid inlet pipelines 2 and the plurality of branch liquid return pipelines 3 are arranged in a staggered manner, and the main liquid inlet pipeline 11 and the main liquid return pipeline 12 are arranged in a staggered manner.

[0116] The staggered arrangement of the plurality of branch liquid inlet pipelines 2 and the plurality of branch liquid return pipelines 3 can facilitate the connection of the plurality of branch liquid inlet pipelines 2 and the plurality of branch liquid return pipelines 3 to the battery packs 30 in the plurality of battery clusters 20, reduce the length of the connecting pipeline between the branch liquid inlet pipeline 2 and the cooling liquid inlet 301 of the battery pack, and reduce the length of the connecting pipeline between the branch liquid return pipeline 3 and the cooling liquid outlet 302 of the battery pack, which is conducive to reducing the cost and weight. In addition, through the staggered arrangement, the size of the energy storage device 100 in the third direction can also be reduced, which is conducive to the miniaturization and light weight of the energy storage device 100.

[0117] The main liquid inlet pipeline 11 and the main liquid return pipeline 12 are arranged in a staggered manner, which can facilitate the connection of the main liquid inlet pipeline 11 with the plurality of branch liquid inlet pipelines 2 and the connection of the main liquid return pipeline 12 with the plurality of branch liquid return pipelines 3. Moreover, through the staggered arrangement, the size of the energy storage device in the third direction can be reduced, which is conducive to the miniaturization and light weight of the energy storage device.

[0118] Figure 6 For Figure 5 , the partial structure diagram of the liquid cooling pipeline assembly in the energy storage device is shown. Referring to Figure 6 , the plurality of branch liquid inlet pipelines 2 includes a first branch liquid inlet pipeline 21, a second branch liquid inlet pipeline 22, and a third branch liquid inlet pipeline 23. The first branch liquid inlet pipeline 21, the second branch liquid inlet pipeline 22, and the third branch liquid inlet pipeline 23 are respectively connected with the first valve 4.

[0119] Referring to Figure 6 , the third branch liquid inlet pipeline 23 is provided with a second valve 5. The third branch liquid inlet pipeline 23 includes a first connecting pipeline 232 and a plurality of liquid inlet branches 231. The first connecting pipeline 232 connects the second valve 5 and the first valve 4. The plurality of liquid inlet branches 231 are respectively connected with the second valve 5.

[0120] By providing the second valve 5 on the third branch liquid inlet pipeline 23 and making the third branch liquid inlet pipeline 23 include the plurality of liquid inlet branches 231, the cooling liquid flowing into the third branch liquid inlet pipeline 23 can flow into the plurality of liquid inlet branches 231 through the second valve 5. Since the plurality of liquid outlet openings of the liquid inlet branches 231 are in communication with the cooling liquid inlets 301 of different battery packs, the positions of the plurality of liquid inlet branches 231 can be arranged to perform zoned cooling on the battery packs of the plurality of battery clusters 20, so as to adjust the temperature of the battery packs in the plurality of battery clusters 20 in a zoned manner and reduce the temperature difference between the battery packs in different regions.

[0121] Compared with the zoned cooling mode realized by only the first valve 4 and the plurality of branch liquid inlet pipelines 2, when cooling the same number of regions, by providing the second valve 5 and the plurality of liquid inlet branches 231 on the third branch liquid inlet pipeline 23, the number of valve port outlets of the first valve 4 can be reduced. On the one hand, the valve port design difficulty of the first valve 4 can be reduced, the manufacturing cost can be reduced, and the pipeline connection difficulty can be reduced. On the other hand, the difficulty of controlling the first valve 4 to adjust the cooling liquid flow entering the plurality of branch liquid inlet pipelines 2 can be reduced, the control can be facilitated, and the control cost can be reduced.

[0122] In some embodiments, referring to Figure 6, the first valve 4 is a four-way valve. Compared with the first valve 4 being a five-way valve or a valve of five or more ways, by setting the first valve 4 as a four-way valve, on the one hand, the valve passage design difficulty of the first valve 4 can be reduced, the manufacturing cost can be reduced, and the pipeline connection difficulty can be reduced, and on the other hand, the difficulty of controlling the first valve 4 to adjust the flow of the cooling liquid into the plurality of branch liquid inlet pipelines 2 can be reduced, the control can be facilitated, and the control cost can be reduced.

[0123] In some embodiments, referring to Figure 6 , the second valve 5 is a three-way valve. Compared with the second valve 5 being a four-way valve or a valve of four or more ways, by setting the second valve 5 as a three-way valve, on the one hand, the valve passage design difficulty of the second valve 5 can be reduced, the manufacturing cost can be reduced, and the pipeline connection difficulty can be reduced, and on the other hand, the difficulty of controlling the second valve 5 to adjust the flow of the cooling liquid flowing out of the plurality of second valve outlets 52 can be reduced, the control can be facilitated, and the control cost can be reduced.

[0124] In other embodiments, the specific forms of the first valve 4 and the second valve 5 can also be selectively designed according to actual needs, for example, the first valve 4 is a five-way valve, the number of the branch liquid inlet pipelines 2 corresponding thereto is four, and the four valve outlets of the first valve 4 and the four branch liquid inlet pipelines 2 are in one-to-one communication. For another example, the second valve 5 is a four-way valve, the number of the liquid inlet branches 231 corresponding thereto is three, and the three valve outlets of the second valve 5 and the three liquid inlet branches 231 are in one-to-one communication. The present application does not specially limit this.

[0125] Hereinafter, the present application will be described by taking the first valve 4 being a four-way valve and the second valve 5 being a three-way valve as examples.

[0126] Figure 7 is a partial exploded view of the liquid cooling pipeline assembly in Figure 6 . Figure 8 is a partial structure schematic view of the first valve in Figure 7 . Referring to Figure 7 and Figure 8 , the main liquid inlet pipeline 11 includes a second liquid inlet 111 and a second liquid outlet 112. The first valve 4 includes a first valve inlet 41 and a plurality of first valve outlets 42. The plurality of first valve outlets 42 include a first valve outlet a 421, a first valve outlet b 422, and a first valve outlet c 423. The first valve inlet 41 and the second liquid outlet 112 are in communication. The first valve outlet a 421 is in communication with the liquid inlet of the first branch liquid inlet pipeline 21, the first valve outlet b 422 is in communication with the liquid inlet of the second branch liquid inlet pipeline 22, and the first valve outlet c 423 is in communication with the liquid inlet of the third branch liquid inlet pipeline 23.

[0127] The flow of the cooling liquid flowing out of the first valve outlet a 421, the first valve outlet b 422, and the first valve outlet c 423 is adjusted by controlling the opening degree of the first valve 4.

[0128] It can be understood that by controlling the opening degree of the first valve 4, the flow rate of the cooling liquid flowing into the first branch liquid inlet pipeline 21, the second branch liquid inlet pipeline 22 and the third branch liquid inlet pipeline 23 is adjusted, the cooling effect of the battery pack connected with the first branch liquid inlet pipeline 21, the second branch liquid inlet pipeline 22 and the third branch liquid inlet pipeline 23 respectively is ensured, and local overheating is prevented to cause thermal runaway of the battery pack. Compared with the series cooling mode of the prior art, the technical solution given in the application can cool the battery pack 30 in the plurality of battery clusters 20 through the first branch liquid inlet pipeline 21, the second branch liquid inlet pipeline 22 and the third branch liquid inlet pipeline 23, and the temperature difference between the battery packs 30 connected with the first branch liquid inlet pipeline 21, the second branch liquid inlet pipeline 22 and the third branch liquid inlet pipeline 23 respectively can be reduced.

[0129] In some embodiments, the battery pack 30 of the plurality of battery clusters 20 can be zoned cooled by arranging the positions of the first branch liquid inlet pipeline 21, the second branch liquid inlet pipeline 22 and the third branch liquid inlet pipeline 23, so as to reduce the temperature difference between the battery packs 30 in different areas, make the temperature in the energy storage device 100 more uniform, and make the operation safety and reliability of the energy storage device 100 higher.

[0130] In other embodiments of the application, the number of the plurality of first valve outlets 42 and the number of the plurality of branch liquid inlet pipelines 2 can be selectively designed according to actual needs, and the application does not make special limitation thereto.

[0131] Figure 9 For Figure 7 The partial structure diagram of the second valve 5 is shown. Referring to Figure 7 and Figure 9 The plurality of liquid inlet branches 231 includes a first liquid inlet branch 2311 and a second liquid inlet branch 2312. The second valve 5 includes a second valve inlet 51 and a plurality of second valve outlets 52. The plurality of second valve outlets 52 includes a second valve outlet a 521 and a second valve outlet b 522. The second valve inlet 51 is in communication with the first valve outlet c 423 through a first connecting pipeline 232. The second valve outlet a 521 is in communication with the first liquid inlet branch 2311. The second valve outlet b 522 is in communication with the second liquid inlet branch 2312.

[0132] The flow rate of the cooling liquid flowing out of the second valve outlet a 521 and the second valve outlet b 522 is adjusted by controlling the opening degree of the second valve 5.

[0133] It can be understood that by controlling the opening degree of the second valve 5, the flow rate of the cooling liquid flowing into the first liquid inlet branch 2311 and the second liquid inlet branch 2312 is adjusted to ensure the cooling effect of the battery pack connected with the first liquid inlet branch 2311 and the second liquid inlet branch 2312 respectively, so as to prevent local overheating and cause the battery pack to be out of control. And it can also be used to regulate the temperature of the battery pack connected with the first liquid inlet branch 2311 and the second liquid inlet branch 2312 respectively, so as to reduce the temperature difference between the battery packs connected with the first liquid inlet branch 2311 and the second liquid inlet branch 2312 respectively, and to reduce the temperature difference between the battery packs in different areas in the energy storage device 100. The internal temperature of the energy storage device 100 is more uniform, so the operation safety and reliability of the energy storage device 100 are higher.

[0134] Referring to Figure 7 Each branch liquid inlet pipe 2 includes a first liquid inlet pipe section 213 and a second liquid inlet pipe section 214 connected in communication. The first liquid inlet pipe section 213 includes a fourth liquid inlet 211, and the cooling liquid flows into the branch liquid inlet pipe 2 from the fourth liquid inlet 211. The second liquid inlet pipe section 214 includes a plurality of fourth liquid outlets 212 arranged in the first direction.

[0135] The first branch liquid inlet pipe 21 includes a first liquid inlet pipe section 213 and a plurality of second liquid inlet pipe sections 214 connected in communication, such as three second liquid inlet pipe sections 214. The first liquid inlet pipe section 213 is connected with the first valve 4, and the first liquid inlet pipe section 213 extends in the second direction. The second liquid inlet pipe section 214 extends in the first direction, and a plurality of fourth liquid outlets 212 are arranged on each second liquid inlet pipe section 214. In each second liquid inlet pipe section 214, the plurality of fourth liquid outlets 212 are arranged in the first direction.

[0136] The second branch liquid inlet pipe 22 is arranged in the same way as the first branch liquid inlet pipe 21, and the present application will not be repeated here.

[0137] In the third branch liquid inlet pipe 23, each liquid inlet branch 231 includes a first liquid inlet pipe section 213 and a plurality of second liquid inlet pipe sections 214 connected in communication, such as three second liquid inlet pipe sections 214. The first liquid inlet pipe section 213 is connected with the second valve 5, and the first liquid inlet pipe section 213 extends in the second direction. The second liquid inlet pipe section 214 extends in the first direction, and a plurality of fourth liquid outlets 212 are arranged on each second liquid inlet pipe section 214. In each second liquid inlet pipe section 214, the plurality of fourth liquid outlets 212 are arranged in the first direction.

[0138] Figure 10 A local structure diagram of a third energy storage device is provided in the embodiment of the present application. Referring to Figure 10, shows a plurality of battery clusters 20. The plurality of battery clusters 20 are spaced apart along a second direction. Each battery cluster 20 comprises a plurality of battery packs 30 stacked along a first direction.

[0139] In the first direction, the first valve 4 is located at a middle position of the plurality of battery clusters 20. It can be understood that when the battery packs 30 stacked along the first direction are even in number (such as four, eight, etc.), the first valve 4 is located between the two middle battery packs among the even number of battery packs 30 along the first direction. When the number of battery packs 30 is odd (such as three, seven, etc.), the first valve 4 is located at the middle battery pack among the odd number of battery packs 30 along the first direction.

[0140] In the second direction, the first valve 4 is located at a middle position of the plurality of battery clusters 20. It can be understood that when the number of battery clusters 20 is even (such as four, eight, etc.), the first valve 4 is located between the two middle battery clusters 20 among the even number of battery clusters 20 along the second direction. When the number of battery clusters 20 is odd (such as three, seven, etc.), the first valve 4 is located at the middle battery cluster 20 among the odd number of battery clusters 20 along the second direction.

[0141] Since the cooling liquid is distributed into the plurality of branch liquid inlet pipelines 2 through the first valve 4, the first valve 4 of the present application is located at a middle position of the plurality of battery clusters 20 along the first direction, which can enable the cooling liquid to quickly enter the plurality of battery packs 30 on both sides of the first direction, ensuring the cooling effect of each battery pack 30 in the first direction. Compared with the series liquid cooling mode of each battery cluster 20 in the prior art, the present application can reduce the pipeline flow resistance from the first valve 4 to the battery packs 30 on both sides of the first direction, improving the refrigeration effect of the battery packs 30 on both sides of the first direction.

[0142] Along the second direction, the first valve 4 of the present application is located at a middle position of the plurality of battery clusters 20, which can enable the cooling liquid to quickly enter the plurality of battery packs 30 on both sides of the second direction, ensuring the cooling effect of each battery pack 30 in the second direction. Compared with the series liquid cooling mode of the plurality of battery clusters 20 in the prior art, the present application can reduce the pipeline flow resistance from the first valve 4 to the battery clusters 20 on both sides of the second direction, improving the refrigeration effect of the battery packs 30 in the battery clusters 20 on both sides of the second direction.

[0143] By locating the first valve 4 at a middle position of the plurality of battery clusters 20, the plurality of branch liquid inlet pipelines 2 can cool the plurality of battery clusters 20 in a more uniform manner. It also facilitates the connection and maintenance of the first valve 4 and the plurality of branch liquid inlet pipelines 2, reducing the difficulty and cost of maintenance.

[0144] Referring to Figure 10The first valve 4 and the second valve 5 are arranged along a first direction, with the second valve 5 being closer to the bottom of the housing than the first valve 4. The arrangement of the first valve 4 and the second valve 5 along the first direction facilitates the connection between the first connecting pipe 232 and the second valve 5, and also shortens the length of the first connecting pipe 232.

[0145] In some embodiments, the second valve 5 is closer to the housing 10 than the first valve 4 (e.g., Figure 3 The bottom of the housing 10 (as shown). Because impurities may be carried during the coolant transportation process, these impurities are prone to accumulate in the pipeline. Therefore, the second valve 5 is located closer to the bottom of the housing 10 than the first valve 4, which facilitates subsequent maintenance and cleaning and reduces the difficulty of maintenance.

[0146] Figure 11 for Figure 5 This is the second partial structural diagram of the liquid cooling piping assembly. (Refer to...) Figure 11 The multiple branch return lines 3 include a first branch return line 31, a second branch return line 32, and a third branch return line 33. The first branch return line 31, the second branch return line 32, and the third branch return line 33 are respectively connected to the first connector 6.

[0147] Reference Figure 11 The third branch inlet pipe 23 is equipped with a second connector 7. The third branch return pipe 33 includes a second connecting pipe 332 and multiple return branches 331. The second connecting pipe 332 connects the second connector 7 and the first connector 6. The multiple return branches 331 are respectively connected to the second connector 7.

[0148] A second connector 7 is provided on the third branch return pipe 33, and the third branch inlet pipe 23 includes multiple inlet branches 231, so that the coolant flowing into the multiple inlet branches 231 can flow into the second connecting pipe 332 through the second connector 7, and then flow to the main return pipe 12 through the first connector 6 via the second connecting pipe 332.

[0149] The first connector 6 and the second connector 7 can take various forms. For example, in some embodiments, the first connector 6 is a four-way connector and the second connector 7 is a three-way connector. In other embodiments, both the first connector 6 and the second connector 7 are normally open valves; that is, the first connector 6 is a four-way valve and the second connector 7 is a three-way valve. Those skilled in the art can selectively design these according to actual needs.

[0150] Figure 12 for Figure 11 A partial exploded view of the liquid cooling piping assembly. (Refer to...) Figure 12The main liquid return pipeline 12 includes a third liquid inlet 121 and a third liquid outlet 122. The first joint 6 includes a first outlet 62 and a plurality of first inlets 61. The plurality of first inlets 61 are respectively in one-to-one communication with the liquid outlets of the plurality of branch liquid return pipelines 3.

[0151] The cooling liquid after heat exchange with the battery pack enters the branch liquid return pipeline 3 through the liquid inlet of the branch liquid return pipeline 3, and flows into the main liquid return pipeline 12 through the first joint 6 and the third liquid inlet 121 of the main liquid return pipeline 12, and then flows out of the liquid cooling pipeline assembly from the third liquid outlet 122 of the main liquid return pipeline 12.

[0152] Referring to Figure 12 The plurality of liquid return branches 331 include a first liquid return branch 3311 and a second liquid return branch 3312. The second joint 7 includes a second outlet 72 and a plurality of second inlets 71. The second outlet 72 is in communication with the first joint 6 through the second connecting pipeline 332. The plurality of second inlets 71 are respectively in communication with the first liquid inlet branch 2311 and the second liquid inlet branch 2312.

[0153] The cooling liquid can enter the liquid return branch 331 through the liquid inlet of the liquid return branch 331, and then flow into the main liquid return pipeline 12 through the second joint 7, the second connecting pipeline 332, the first joint 6, and the third liquid inlet 121 of the main liquid return pipeline 12, and then flow out of the liquid cooling pipeline assembly from the third liquid outlet 122 of the main liquid return pipeline 12.

[0154] Compared with the liquid return mode through only the first joint 6 and the plurality of branch liquid return pipelines 3, by providing the second joint 7 and the plurality of liquid return branches 331 on part of the branch liquid return pipelines 3, the structure of the first joint 6 can be simplified, the internal flow channel design difficulty of the first joint 6 can be reduced, the manufacturing cost can be reduced, and the pipeline connection difficulty can be reduced.

[0155] Referring to Figure 12 Each branch liquid return pipeline 3 includes a first liquid return pipeline segment 313 and a second liquid return pipeline segment 314 in communication. The second liquid inlet pipeline segment 214 includes a plurality of fifth liquid inlets 311 arranged at intervals along the first direction. The first liquid return pipeline segment 313 includes a fifth liquid outlet 312, and the cooling liquid flows into the branch liquid return pipeline 3 from the fifth liquid inlet 311.

[0156] The first branch liquid return pipeline 31 includes a first liquid return pipeline segment 313 and a plurality of second liquid return pipeline segments 314 in communication, such as three second liquid return pipeline segments 314. The first liquid return pipeline segment 313 is connected with the first joint 6, and the first liquid return pipeline segment 313 extends along the second direction, the second liquid return pipeline segment 314 extends along the first direction, and a plurality of fifth liquid inlets 311 are provided on each second liquid return pipeline segment 314. In each second liquid return pipeline segment 314, the plurality of fifth liquid inlets 311 are arranged at intervals along the first direction.

[0157] The second branch return liquid pipe 32 is arranged in the same way as the first branch return liquid pipe 31, and the application will not be described again.

[0158] The third branch return liquid pipe 33 includes a first return liquid pipe section 313 and a plurality of second return liquid pipe sections 314, such as three second return liquid pipe sections 314, which are connected in series. The first return liquid pipe section 313 is connected to the second joint 7, and the first return liquid pipe section 313 extends in the second direction. The second return liquid pipe sections 314 extend in the first direction, and each second return liquid pipe section 314 is provided with a plurality of fifth liquid inlets 311. In each second return liquid pipe section 314, the plurality of fifth liquid inlets 311 are arranged in the first direction.

[0159] Since the plurality of battery packs 30 in each battery cluster 20 are arranged in the first direction, the cooling liquid outlets 302 of the plurality of battery packs 30 in each battery cluster 20 are also arranged in the first direction. By arranging the plurality of liquid inlets of the second return liquid pipe section 314 in the first direction, the plurality of liquid inlets of the second return liquid pipe section 314 can be connected to the cooling liquid outlets 302 of different battery packs 30, respectively.

[0160] The second return liquid pipe section 314 extends in the first direction, and the extension direction of the first return liquid pipe section 313, the extension direction of the second return liquid pipe section 314, and the opening direction of the cooling liquid outlet 302 of the battery pack 30 are perpendicular to each other. Such an arrangement can make the plurality of pipe sections distributed in an orderly manner, facilitating the connection between the pipe sections and subsequent maintenance.

[0161] Figure 13 A fourth partial structure schematic diagram of an energy storage device according to an embodiment of the application is provided. Referring to Figure 10 and Figure 13 Each branch liquid inlet pipe 2 includes a plurality of cluster liquid outlets 2121 connected to the same battery cluster 20 in the plurality of battery clusters 20, and the plurality of cluster liquid outlets 2121 are connected to the cooling liquid inlets 301 of different battery packs 30 in the same battery cluster 20, respectively. The plurality of branch return liquid pipes 3 include a plurality of cluster liquid inlets 3111 connected to the same battery cluster 20, and the plurality of cluster liquid inlets 3111 are connected to the cooling liquid outlets 302 of different battery packs 30 in the same battery cluster 20, respectively.

[0162] In the same battery cluster 20, the battery packs 30 connected by the plurality of cluster liquid inlets 3111 are the same as the battery packs 30 connected by the plurality of cluster liquid outlets 2121.

[0163] In the same battery cluster 20, the cooling liquid of the branch return liquid pipeline 3 is transported to the cooling liquid inlets 301 of the partial battery packs 30 in the same battery cluster 20 through the plurality of cluster liquid outlet ports 2121, and after heat exchange in the battery pack 30, the cooling liquid enters the plurality of cluster liquid outlet ports 2121 from the cooling liquid outlets 302 of the battery pack 30 and is transported to the main return liquid pipeline 12 through the plurality of cluster liquid outlet ports 2121 and the branch return liquid pipeline 3.

[0164] The battery packs 30 connected by the plurality of cluster liquid inlet ports 3111 and the plurality of cluster liquid outlet ports 2121 are the same, which is more conducive to the partition cooling of the plurality of battery packs 30 in the same battery cluster 20. Because the plurality of battery packs 30 are partition cooled, the temperatures of the cooling liquids flowing out of different regions are different, and if the battery packs 30 connected by the plurality of cluster liquid inlet ports 3111 and the plurality of cluster liquid outlet ports 2121 are different, the cooling liquid flowing into the branch return liquid pipeline 3 from the cluster liquid inlet port 3111 in one region may enter the battery pack 30 through the cluster liquid inlet port 3111 in another region, thereby affecting the cooling effect of the battery pack 30. Therefore, through the scheme provided in the present application, the cooling effects of the plurality of battery packs 30 can be ensured.

[0165] Figure 14 A fifth partial structure schematic diagram of the energy storage device 100 provided in the embodiments of the present application. The plurality of battery clusters 20 are divided into four regions A, B, C, and D. The four regions A, B, C, and D are symmetrically arranged in the first direction and the second direction.

[0166] In other embodiments of the present application, the plurality of battery clusters 20 can also be divided into other numbers of regions, such as two, three, or more than four regions, which are not specially limited in the present application, and a person skilled in the art can selectively design according to actual needs. The opening degree adjustment control process of the first valve 4 and the second valve 5 will be described below in different scenarios in which the plurality of battery clusters 20 are divided into four regions, i.e., region A, region B, region C, and region D.

[0167] In some scenarios, for example, when the temperature difference between each two of the regions A, B, C, and D is within a preset range, such as between 2°C and 5°C, the ratio of the sum of the flow rates of the cooling liquids entering the regions A and B to the sum of the flow rates of the cooling liquids entering the regions C and D is 40%-60%. The flow distribution to the regions A and B and the flow distribution to the regions C and D can adopt a fixed ratio or a variable ratio.

[0168] For example, in some embodiments, when the temperature difference between the regions A and B is within a preset range, such as between 2°C and 5°C, and the temperature difference between the regions C and D is within a preset range, such as between 2°C and 5°C, the flow rate of the cooling liquid entering the regions A and B is the same as the flow rate of the cooling liquid entering the regions C and D.

[0169] When the temperature of any one of the region A, the region B, the region C and the region D is abnormal, the flow of the cooling liquid into the region with higher temperature can be increased by controlling the different opening degrees of the first valve 4 and the second valve 5, so as to realize the low-temperature-difference fine control.

[0170] In some embodiments, the average temperatures of the region A, the region B, the region C and the region D are monitored respectively, so as to allocate more cooling liquid flow to the high-temperature region according to the temperatures of the four regions, and realize the low-temperature-difference operation of the energy storage device 100. The average temperature of each region is obtained by averaging the temperatures collected by the battery pack internal temperature sensors.

[0171] In the table 1, the opening degree adjustment of the first valve 4 and the second valve 5 in different scenarios is shown.

[0172] Table 1

[0173]

[0174] In the table 1, the cooling liquid flow to the first branch inlet pipeline 21 is Q1. The cooling liquid flow to the second branch inlet pipeline 22 is Q2. The cooling liquid flow to the first inlet branch 2311 is Q3. The cooling liquid flow to the second inlet branch 2312 is Q4. The average temperature of the region A is TA. The average temperature of the region B is TB. The average temperature of the region C is TC. The average temperature of the region D is TD.

[0175] Figure 15 A control logic diagram of an energy storage device is provided for the embodiments of the present application. The control process of the energy storage device provided by the present application will be described below in combination with the table 1 and the table 2. Figure 15 The control process of the energy storage device provided by the present application will be described below in combination with the table 1 and the table 2.

[0176] Referring to Figure 15 The average temperatures of the region A, the region B, the region C and the region D are monitored. The average temperature of each region is obtained by averaging the temperatures collected by the battery pack internal temperature sensors in the region.

[0177] In some scenarios, TB-TA>5℃, in which case the temperature of the region B is greater than that of the region A, and the temperature difference between the region B and the region A is greater than a preset range (for example, the preset range is 2-5℃). By controlling the opening degree of the first valve 4, the cooling liquid flow Q2 to the second branch inlet pipeline 22 is 80% of the sum of the cooling liquid flow to the first branch inlet pipeline 21 and the cooling liquid flow to the second branch inlet pipeline 22, i.e. Correspondingly, the cooling liquid flow rate Q1 flowing to the first branch liquid inlet pipeline 21 is 20% of the sum of the cooling liquid flow rate Q1 flowing to the first branch liquid inlet pipeline 21 and the cooling liquid flow rate Q2 flowing to the second branch liquid inlet pipeline 22, that is, In this way, more cooling liquid flow rate can be allocated to the region B to quickly reduce the temperature of the region B.

[0178] In some scenarios, 2℃ < TB-TA < 5℃, in which case the temperature of the region B is greater than that of the region A, and the temperature difference between the region B and the region A is in a preset range (for example, greater than 2℃-5℃). By controlling the opening degree of the first valve 4, the cooling liquid flow rate Q1 flowing to the first branch liquid inlet pipeline 21 is 20% of the sum of the cooling liquid flow rate Q1 flowing to the first branch liquid inlet pipeline 21 and the cooling liquid flow rate Q2 flowing to the second branch liquid inlet pipeline 22, that is, In this way, the cooling liquid flow rate allocated to the region B can be slightly greater than that allocated to the region A to reduce the temperature of the region B.

[0179] In some scenarios, TD-TC > 5℃, in which case the temperature of the region D is greater than that of the region C, and the temperature difference between the region D and the region C is greater than a preset range (for example, the preset range is 2℃-5℃). By controlling the opening degree of the second valve 5, the cooling liquid flow rate Q4 flowing to the second liquid inlet branch 2312 is 80% of the sum of the cooling liquid flow rate Q3 flowing to the first liquid inlet branch 2311 and the cooling liquid flow rate Q4 flowing to the second liquid inlet branch 2312, that is, Correspondingly, the cooling liquid flow rate Q3 flowing to the first liquid inlet branch 2311 is 80% of the sum of the cooling liquid flow rate Q3 flowing to the first liquid inlet branch 2311 and the cooling liquid flow rate Q4 flowing to the second liquid inlet branch 2312, that is, In this way, more cooling liquid flow rate can be allocated to the region D to quickly reduce the temperature of the region D.

[0180] In some scenarios, 2℃ < TD-TC < 5℃, in which case the temperature of the region D is greater than that of the region C, and the temperature difference between the region D and the region C is in a preset range (for example, the preset range is 2℃-5℃). By controlling the opening degree of the second valve 5, the cooling liquid flow rate Q1 flowing to the first branch liquid inlet pipeline 21 is 20% of the sum of the cooling liquid flow rate Q1 flowing to the first branch liquid inlet pipeline 21 and the cooling liquid flow rate Q2 flowing to the second branch liquid inlet pipeline 22, that is, In this way, the cooling liquid flow rate allocated to the region D can be slightly greater than that allocated to the region C to reduce the temperature of the region D.

[0181] In some scenarios, TC-TD > 5℃. In this case, the temperature of the region C is greater than that of the region D, and the temperature difference between the region C and the region D is greater than a preset range (for example, the preset range is 2℃-5℃). By controlling the opening degree of the second valve 5, the cooling liquid flow rate Q4 flowing to the second liquid inlet branch 2312 is 80% of the sum of the cooling liquid flow rate Q3 flowing to the first liquid inlet branch 2311 and the cooling liquid flow rate Q4 flowing to the second liquid inlet branch 2312, that is, In this way, more cooling liquid flow rate can be allocated to the region C to quickly reduce the temperature of the region C.

[0182] In some scenarios, 2℃ < TC-TD < 5℃, in which case the temperature of region C is greater than that of region D, and the temperature difference between region C and region D is within a preset range (for example, the preset range is 2℃-5℃). By controlling the opening degree of the second valve 5, the cooling liquid flow rate allocated to region C is made slightly greater than the cooling liquid flow rate allocated to region D, so as to reduce the temperature of region C. In this way, the cooling liquid flow rate allocated to region C can be made slightly greater than the cooling liquid flow rate allocated to region D, so as to reduce the temperature of region C.

[0183] In some scenarios, one or more regions are in an abnormally high-temperature working condition, and high-flow liquid cooling can be concentrated on the regions in the abnormally high-temperature working condition to quickly reduce the risk of safety heat spread. For example, in some scenarios, region B is in an abnormally high-temperature working condition. For example, TB > 80℃-120℃, and high-flow liquid cooling can be concentrated on region B, for example, the cooling liquid flowing in from the main liquid inlet pipeline 11 is all introduced into region B through the second branch liquid inlet pipeline 22, so as to quickly reduce the temperature of region B. The cooling liquid flow rate flowing into region A is 100% of the cooling liquid flow rate flowing in from the main liquid inlet pipeline 11.

[0184] In some scenarios, regions A and B are both in an abnormally high-temperature working condition. For example, TA > 80℃-120℃ and TB > 80℃-120℃, and the flow rate of region A and region B can be concentrated, for example, the cooling liquid flowing in from the main liquid inlet pipeline 11 is evenly distributed to region A and region B. The cooling liquid flow rate flowing into regions A and B is 50% of the cooling liquid flow rate flowing in from the main liquid inlet pipeline 11.

[0185] In some scenarios, regions A, B, C are all in an abnormally high-temperature working condition. For example, TA > 80℃-120℃, TB > 80℃-120℃, and TC > 80℃-120℃. The flow rate of regions A, B and C can be concentrated, for example, the cooling liquid flowing in from the main liquid inlet pipeline 11 is evenly distributed to regions A, B and C. The cooling liquid flow rate flowing into regions A, B and C is 33.3% of the cooling liquid flow rate flowing in from the main liquid inlet pipeline 11.

[0186] In some scenarios, regions A, B, C and D are all in an abnormally high-temperature working condition. For example, TA > 80℃-120℃, TB > 80℃-120℃, TC > 80℃-120℃, and TD > 80℃-120℃. The flow rate of regions A, B, C and D can be concentrated, for example, the cooling liquid flowing in from the main liquid inlet pipeline 11 is evenly distributed to regions A, B, C and D. The cooling liquid flow rate flowing into regions A, B, C and D is 25% of the cooling liquid flow rate flowing in from the main liquid inlet pipeline 11.

[0187] In some scenarios, part of the battery clusters 20 in the plurality of battery clusters 20 are not connected to the system operation, and the flow distribution in the area where the battery clusters 20 not connected to the system operation are located can be reduced by controlling the first valve 4 and the second valve 5. The battery clusters 20 connected to the system operation are concentratedly cooled, and the energy consumption is saved.

[0188] For example, in the scenario that any one of the battery clusters 20 in the area A and the area C is not connected to the system operation, the opening degree of the first valve 4 and the opening degree of the second valve 5 are controlled, so that the flow of the cooling liquid flowing into the area A and the flow of the cooling liquid flowing into the area C are both 15% of the flow of the cooling liquid flowing from the main inlet pipe 11, and the flow of the cooling liquid flowing into the area B and the flow of the cooling liquid flowing into the area D are both 35% of the flow of the cooling liquid flowing from the main inlet pipe 11.

[0189] For example, in the scenario that any two of the battery clusters 20 in the area A and the area C are not connected to the system operation, the opening degree of the first valve 4 and the opening degree of the second valve 5 are controlled, so that the flow of the cooling liquid flowing into the area A and the flow of the cooling liquid flowing into the area C are both 10% of the flow of the cooling liquid flowing from the main inlet pipe 11, and the flow of the cooling liquid flowing into the area B and the flow of the cooling liquid flowing into the area D are both 40% of the flow of the cooling liquid flowing from the main inlet pipe 11.

[0190] By the energy storage device and the control logic provided in the present application, the abnormal area can be concentratedly cooled in different operation scenarios, the temperature control precision and the safety response effect of the energy storage device are improved, the enhanced liquid cooling demand in the abnormal scenario of the energy storage device is met, and the temperature of the failed area is effectively reduced.

[0191] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An energy storage device, characterized by, The application relates to a liquid cooling pipeline assembly for a battery pack, comprising a shell, a plurality of battery clusters and a liquid cooling pipeline assembly, wherein each of the battery clusters comprises a plurality of battery packs stacked along a first direction, and the liquid cooling pipeline assembly comprises: a main liquid inlet pipeline comprising a liquid inlet and a liquid outlet; a plurality of branch liquid inlet pipelines, each of which comprises a liquid inlet and a plurality of liquid outlets, and the liquid outlets of the branch liquid inlet pipelines are respectively communicated with the cooling liquid inlets of different battery packs; a first valve comprising a first valve inlet and a plurality of first valve outlets, wherein the first valve inlet is communicated with the liquid outlet of the main liquid inlet pipeline, the plurality of first valve outlets are one-to-one communicated with the liquid inlets of the plurality of branch liquid inlet pipelines, and the first valve is used for adjusting the flow of the cooling liquid flowing out of the plurality of first valve outlets.

2. The energy storage device of claim 1, wherein, The plurality of battery clusters are spaced apart along a second direction, and the liquid cooling pipeline assembly is located on one side of the plurality of battery clusters in a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; in the first direction, the first valve is located at the middle position of the plurality of battery clusters, and / or, in the second direction, the first valve is located at the middle position of the plurality of battery clusters.

3. The energy storage device of claim 1 or 2, wherein, Some of the plurality of branch liquid inlet pipelines are provided with a second valve, and the second valve comprises a plurality of second valve outlets; the part of the branch liquid inlet pipelines comprises a plurality of liquid inlet branches, each of which comprises a liquid inlet and a plurality of liquid outlets; the plurality of second valve outlets are one-to-one communicated with the liquid inlets of the plurality of liquid inlet branches, the plurality of liquid outlets of the liquid inlet branches are communicated with the cooling liquid inlets of different battery packs, and the second valve is used for adjusting the flow of the cooling liquid flowing out of the plurality of second valve outlets.

4. The energy storage device of claim 3, wherein, The first valve and the second valve are arranged along the first direction, and the second valve is closer to the bottom of the shell than the first valve.

5. The energy storage device of claim 3 or 4, wherein, The first valve is a four-way valve; and / or, the second valve is a three-way valve.

6. The energy storage device of any one of claims 1-5, wherein, The branch liquid inlet pipeline comprises a first liquid inlet pipeline section and a second liquid inlet pipeline section which are communicated with each other; the second liquid inlet pipeline section comprises a plurality of liquid outlets which are arranged in the first direction and are communicated with the cooling liquid inlets of different battery packs; the second liquid inlet pipeline section extends along the first direction, and the extending direction of the first liquid inlet pipeline section, the extending direction of the second liquid inlet pipeline section and the opening direction of the cooling liquid inlets of the battery packs are perpendicular to each other.

7. The energy storage device of any one of claims 1-6, wherein, The liquid cooling pipeline assembly further comprises: a main liquid outlet pipeline comprising a liquid inlet for the inflow of cooling liquid and a liquid outlet for the outflow of cooling liquid; a plurality of branch liquid outlet pipelines, and the liquid outlets of the plurality of branch liquid outlet pipelines are respectively communicated with the main liquid outlet pipeline; the plurality of branch liquid inlet pipelines comprise a plurality of cluster liquid outlets connected with part of battery packs in the same battery cluster in the plurality of battery clusters, and the plurality of cluster liquid outlets are respectively communicated with the cooling liquid inlets of different battery packs in the same battery cluster; The plurality of branch liquid return pipes comprise a plurality of cluster liquid inlets connected to part of the battery packs of the same battery cluster, and the plurality of cluster liquid inlets are respectively in communication with the cooling liquid outlets of different battery packs in the same battery cluster. In the same battery cluster, the battery packs connected by the plurality of cluster liquid inlets are the same as the battery packs connected by the plurality of cluster liquid outlets.

8. The energy storage device of claim 7, wherein, The plurality of branch liquid inlets are closer to the plurality of battery clusters than the plurality of branch liquid return pipes, and / or, The main liquid inlet is closer to the plurality of battery clusters than the main liquid return pipe.

9. The energy storage device of claim 7 or 8, wherein, The plurality of branch liquid inlets and the plurality of branch liquid return pipes are arranged in a staggered manner, and / or, The main liquid inlet and the main liquid return pipe are arranged in a staggered manner.

10. The energy storage device of any one of claims 7-9, wherein, The branch liquid return pipe comprises a first branch liquid return pipe segment and a second branch liquid return pipe segment in communication; The second branch liquid return pipe segment comprises a plurality of liquid inlets arranged at intervals along the first direction, and the plurality of liquid inlets of the second branch liquid return pipe segment are respectively in communication with the cooling liquid outlets of different battery packs; The second branch liquid return pipe segment extends along the first direction, and the extension direction of the second branch liquid return pipe segment, the extension direction of the first branch liquid return pipe segment, and the opening direction of the cooling liquid outlet of the battery pack are perpendicular to each other.

11. The energy storage device of any one of claims 7-10, wherein, The liquid cooling pipe assembly further comprises: The first joint comprises a first outlet and a plurality of first inlets, the plurality of first inlets are respectively in communication with the first outlet, the first outlet is in communication with the liquid inlet of the main liquid return pipe, and the plurality of first inlets are in one-to-one communication with the liquid outlets of the plurality of branch liquid return pipes.

12. The energy storage device of claim 11, wherein, The second joint is arranged on part of the plurality of branch liquid return pipes, and the second joint comprises a plurality of second inlets; The part of the branch liquid return pipes further comprises a plurality of liquid return branches, each of the liquid return branches is provided with a liquid outlet and a plurality of liquid inlets; The liquid outlet of the plurality of liquid return branches is in one-to-one communication with the plurality of second inlets, and the plurality of liquid inlets of the liquid return branches are respectively in communication with the cooling liquid outlets of different battery packs.

13. An energy storage system characterized by, The power conversion device is connected to the energy storage device to convert the current input to or output from the energy storage device. The power conversion device is connected to the energy storage device to convert the current input to or output from the energy storage device.

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