Cooling pipeline of energy storage system, cooling module of energy storage system and energy storage system

Abstract

The utility model provides a cooling pipeline of an energy storage system, a cooling module of the energy storage system and the energy storage system, the energy storage system comprises at least one battery cluster, the battery cluster comprises multiple layers of battery packs, and each layer of battery pack comprises a first end part and a second end part; the refrigerator comprises a pipeline connector; the cooling pipeline comprises a first pipeline and a second pipeline, an inlet of the first pipeline is communicated with the pipeline connector, and an outlet of the first pipeline is communicated with an inlet of the second pipeline; wherein the first pipeline and the second pipeline are arranged in a spaced mode in the width direction of the energy storage system or the length direction of the energy storage system, the first pipeline is arranged closer to the first end portion relative to the second pipeline, and the second pipeline is arranged closer to the second end portion relative to the first pipeline. And the battery packs on the same layer are simultaneously cooled by the first pipeline and the second pipeline.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, specifically to a cooling pipe for an energy storage system, a cooling module for an energy storage system, and an energy storage system. Background Technology

[0002] As an important form of energy storage in the energy system, energy storage containers house multiple battery clusters, which are cooled by an air-cooling system. This air-cooling system includes air conditioning and cooling ducts. The cooling ducts are located at the top of the battery clusters and typically only cool the battery packs closest to the top. Furthermore, the cooling ducts only cool specific areas of the same battery pack, resulting in varying cooling effects between batteries located at different positions within the same battery pack. Utility Model Content

[0003] The embodiments of this utility model provide a cooling pipe, a cooling module, and an energy storage system for an energy storage system, which can improve the technical problem of uneven cooling effect of energy storage containers.

[0004] In a first aspect, embodiments of the present invention provide an energy storage system, comprising:

[0005] At least one battery cluster, the battery cluster comprising multiple battery packs spaced apart along the height direction of the energy storage system, each battery pack comprising a first end and a second end opposite to each other along the width direction or the length direction of the energy storage system;

[0006] Refrigerator, including pipe connections;

[0007] A cooling pipe, comprising a first pipe and a second pipe, wherein the inlet of the first pipe is connected to the pipe interface and the outlet of the first pipe is connected to the inlet of the second pipe;

[0008] The first pipe and the second pipe are spaced apart along the width or length of the energy storage system. The first pipe is positioned closer to the first end than the second pipe, and the second pipe is positioned closer to the second end than the first pipe. The battery pack in the same layer is cooled by both the first pipe and the second pipe.

[0009] In one embodiment, the battery cluster includes a top surface and a bottom surface disposed along the height direction of the energy storage system, at least a portion of the first pipe and at least a portion of the second pipe are both configured to extend between the top surface and the bottom surface, and the flow direction of the cooling medium in the first pipe is opposite to the flow direction of the second pipe.

[0010] In one embodiment, the first pipe includes a bent interface section and a cooling section, one end of the interface section is connected to the pipe interface, the other end of the interface section is connected to the cooling section, and the cooling section is connected to the second pipe.

[0011] In one embodiment, the first pipe is provided with a plurality of first interfaces, the second pipe is provided with a plurality of second interfaces, and the cooling pipe further includes a plurality of connecting branch pipes; wherein each of the connecting branch pipes is connected to the corresponding first interface and the corresponding second interface, and the plurality of connecting branch pipes are spaced apart along the height direction of the energy storage system.

[0012] In one embodiment, the outlet of the first pipe is higher than the inlet of the first pipe, and the inner diameter of the plurality of connecting branch pipes gradually increases along the direction from the inlet of the first pipe to the outlet of the first pipe; or, the outlet of the first pipe is lower than the inlet of the first pipe, and the inner diameter of the plurality of connecting branch pipes gradually increases along the direction from the inlet of the first pipe to the outlet of the first pipe.

[0013] In one embodiment, the battery pack has m layers, including a bottom battery pack at the bottom of the battery cluster and a top battery pack at the top of the battery cluster; the number of connecting pipes is n, including top connecting pipes and bottom connecting pipes, with the top connecting pipes corresponding to the top battery pack and the bottom connecting pipes corresponding to the bottom battery pack. The diameter of the bottom connecting pipe is R1, and the diameter of the top connecting pipe is Rn; wherein, the n connecting pipes also include intermediate connecting pipes corresponding to the Xth layer of the battery pack. The connecting branch pipe has a diameter of Rx, which satisfies the following relationship: Rx=R1+(X-1)×(Rn-R1)÷(n-1), 20mm≤R1≤50mm, 100mm≤Rn≤120mm, R1≤Rx≤Rn; or, Rx satisfies the following relationship: Rx=R1-(X-1)×(R1-Rn)÷(n-1), 20mm≤Rn≤50mm, 100mm≤R1≤120mm, Rn≤Rx≤R1, where n is a positive integer and n≥2, and m is a positive integer and m≥3.

[0014] In one embodiment, the first duct is provided with multiple sets of first air outlets, and the second duct is provided with multiple sets of second air outlets. Each set of first air outlets and the corresponding set of second air outlets are configured to face the same battery pack. The number of first air outlets in each set is n1, the number of second air outlets in each set is n2, each layer of the battery pack is provided with multiple ventilation openings, and the number of ventilation openings in each layer of the battery pack is m1. The sum of n1 and n2 is set to be no greater than m1.

[0015] In one embodiment, the cooling pipe is configured in a U-shape.

[0016] Secondly, embodiments of this utility model provide a cooling pipe for an energy storage system, the cooling pipe including the aforementioned cooling pipe.

[0017] Thirdly, embodiments of this utility model provide a cooling module for an energy storage system, the cooling module including the aforementioned cooling pipes and cooler.

[0018] The beneficial effects of the embodiments of this utility model are as follows:

[0019] In embodiments of this invention, a first pipe and a second pipe are provided at intervals along the width or length of the energy storage system. The inlet of the first pipe is connected to a pipe interface, and the outlet of the first pipe is connected to the inlet of the second pipe. This allows the cooling medium to enter the first pipe through the inlet and enter the second pipe through the outlet. The first pipe is located near the first end and is used to cool the left or front portion of each battery pack, while the second pipe is located near the second end and is used to cool the right or rear portion of each battery pack. This ensures that the left and right batteries or the front and rear batteries of each battery pack are adequately cooled, maintaining a uniform temperature across the entire battery pack. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional schematic diagram of an energy storage system from one perspective, provided in Embodiment 1 of this utility model;

[0022] Figure 2 This is a three-dimensional schematic diagram of an energy storage system from another perspective, provided in Embodiment 1 of this utility model.

[0023] Figure 3 This is a three-dimensional schematic diagram of the refrigerator and cooling pipes provided in Embodiment 1 of this utility model;

[0024] Figure 4 This is a three-dimensional schematic diagram of an energy storage system from one perspective, provided in Embodiment 2 of this utility model;

[0025] Figure 5 yes Figure 4 A magnified view of a portion of the image;

[0026] Figure 6 This is a perspective view of the cooling pipe provided in an embodiment of the present invention;

[0027] Icon labels:

[0028] 100. Energy storage system;

[0029] 1. Battery cluster; 111. Top surface; 112. Bottom surface; 12. Battery pack; 121. First end; 122. Second end; 123. Bottom battery pack; 124. Top battery pack; 13. Vent;

[0030] 2. Refrigerator; 21. Pipe joint;

[0031] 3. Cooling pipe; 31. First pipe; 311. First pipe inlet; 312. First pipe outlet; 313. First air outlet; 314. Cooling section; 315. Interface section; 316. First interface; 32. Second pipe; 321. Second pipe inlet; 322. End; 323. Second air outlet; 324. Second interface; 33. Connecting branch pipe; 331. Bottom connecting pipe; 332. Top connecting pipe; 333. Middle connecting branch pipe;

[0032] 4. Battery rack; 41. Upright column; 42. Crossbeam; 43. Side beam; Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0034] As an important form of energy storage in the energy system, energy storage containers have advantages such as high capacity, high reliability, high flexibility, and strong environmental adaptability. The heat dissipation system in the energy storage container has a significant impact on its performance.

[0035] In related technologies, the heat dissipation system of energy storage containers adopts an air-cooled system, which includes air conditioning and cooling ducts. The cooling ducts are located on the top of the battery clusters in the energy storage container. The cooling ducts can usually only cool the battery packs close to the top of the battery clusters, and the cooling ducts can only cool a local part of the same battery pack, resulting in differences in cooling effect between different locations of the same battery pack.

[0036] The embodiments of this application provide an improved cooling pipe structure inside an energy storage container, which enables the cooling pipes to provide cooling to different locations of the same battery pack, thereby improving the uniformity of the cooling effect of the same battery pack.

[0037] refer to Figure 1 and Figure 2 The embodiments of this application provide an energy storage system 100, which includes a housing (not shown in the figure), at least one battery cluster 1, a cooler 2, a cooling pipe 3, and a battery rack 4.

[0038] The container is constructed in the form of a shipping container. At least one battery cluster 1, cooling pipe 3 and battery rack 4 are all located inside the container. Depending on the number of battery clusters contained inside the container, the container can be equipped with multiple cabinet doors, with multiple cabinet doors corresponding to multiple battery clusters.

[0039] At least one battery cluster 1 is disposed within the enclosure. The battery cluster 1 includes multiple battery packs arranged along the height direction of the energy storage system. The number of batteries in each battery pack can be one or more. The height direction of the energy storage system is defined as the height direction of the enclosure. The height direction of the energy storage system is as follows: Figure 1 The Z-direction is shown. There can be at least one battery cluster, and multiple battery clusters are arranged side-by-side along the length of the energy storage system. The length of the energy storage system is defined as the length of the enclosure. The length of the energy storage system is as shown in the figure. Figure 1 As shown in the x-direction, each layer of battery packs in multiple battery clusters are arranged side by side along the length of the energy storage system to form a battery cluster group.

[0040] Battery rack 4 is located inside the enclosure and is used to install battery packs. When multiple battery clusters are installed inside the enclosure, multiple battery racks are correspondingly installed inside the enclosure, with each battery rack accommodating one battery cluster. Battery rack 4 includes multiple uprights 41, multiple crossbeams 42, and multiple side beams 43. The uprights 41 extend along the height direction of the energy storage system, the crossbeams 42 extend along the length direction of the energy storage system, and the side beams 43 extend along the width direction of the energy storage system. The uprights 41, crossbeams 42, and side beams 43 are arranged perpendicularly in pairs. The multiple uprights 41, crossbeams 42, and side beams 43 are combined to form multiple battery cavities, each of which is used to accommodate one battery pack.

[0041] Refrigerator 2 can be an air conditioner that provides cooling air. Alternatively, refrigerator 2 can be a liquid-cooled unit that provides coolant. Alternatively, refrigerator 2 can be a cooling device that provides phase-change refrigerant. Taking an air conditioner as an example, the air conditioner can be a large, floor-standing unit that can be installed inside or outside the enclosure. In other alternative embodiments, the air conditioner can be a small, wall-mounted unit installed on the inner side of the enclosure.

[0042] Cooling pipe 3 includes a first pipe 31 and a second pipe 32 that are connected to each other. The first pipe 31 and the second pipe 32 are spaced apart along the length direction or the width direction of the energy storage system, wherein the length direction of the energy storage system is as follows: Figure 1 As shown in the x-direction, the width direction of the energy storage system is as follows: Figure 1 As shown in the y-direction. The first pipe 31 includes a first pipe inlet 311 and a first pipe outlet 312 located at its two ends, and the second pipe 32 includes a second pipe inlet 321 located at its end. The first pipe 31 is disposed closer to the first end 121 than the second pipe 32, and the second pipe 32 is disposed closer to the second end 122 than the first pipe 31. The same battery pack is cooled by the first pipe 31 and the second pipe 32 simultaneously.

[0043] In specific implementation, both the first pipe 31 and the second pipe 32 are located on the back of the battery pack. The first pipe 31 and the second pipe 32 are spaced apart along the length x of the energy storage system. The first pipe 31 is located near the left side of the battery pack, and the second pipe 32 is located near the right side of the battery pack. The same battery pack is simultaneously cooled by the first pipe 31 near the left side and the second pipe 32 near the right side, so that both the left and right sides of the battery pack can be cooled. The first pipe 31 and the second pipe 32 are connected, so the cooling effect of the first pipe 31 on the left side of the battery pack is basically the same as the cooling effect of the second pipe 32 on the right side of the battery pack. This improves the cooling efficiency of the cooling pipes on the battery pack and keeps the temperature of different parts of the battery pack uniform.

[0044] In other alternative embodiments, the first pipe 31 and the second pipe 32 are both disposed on the left and / or right side of the battery pack, wherein the first pipe 31 and the second pipe 32 are spaced apart along the width direction of the energy storage system, the first pipe 31 is disposed near the front end of the battery pack, and the second pipe 32 is disposed near the rear end of the battery pack. The same battery pack is simultaneously cooled by the first pipe 31 near the front end and the second pipe 32 near the rear end, so that both the front and rear ends of the battery pack can be cooled. Moreover, the first pipe 31 and the second pipe 32 are connected, so the cooling effect of the first pipe 31 on the front end of the battery pack is basically the same as the cooling effect of the second pipe 32 on the rear end of the battery pack. This improves the cooling efficiency of the cooling pipes on the battery pack while maintaining the temperature uniformity of different parts of the battery pack.

[0045] In some embodiments, continue to refer to Figure 1 and Figure 2 The battery cluster 1 includes a top surface 111 and a bottom surface 112 disposed along the height direction of the energy storage system. As shown in the figure, at least a portion of the first pipe 31 and at least a portion of the second pipe 32 are both configured to extend between the top surface 111 and the bottom surface 112 of the battery cluster 1. The flow direction of the cooling medium in the first pipe 31 is opposite to the flow direction in the second pipe 32. In a specific implementation, the flow direction of the cooling medium in the first pipe 31 is from the bottom surface 112 of the battery cluster to the top surface 111 of the battery cluster 1, and the flow direction of the cooling medium in the second pipe 32 is from the top surface 111 of the battery cluster to the bottom surface 112 of the battery cluster.

[0046] By setting the first pipe 31 and the second pipe 32 along the height direction z of the battery cluster, both the top battery pack at the top and the bottom battery pack at the bottom of the battery cluster can be cooled by the cooling pipe 3, thereby achieving temperature uniformity between the top and bottom battery packs. The cooling medium flows from the first pipe 31 into the second pipe 32, with the flow direction of the cooling medium in the first pipe 31 opposite to that in the second pipe 32. Taking the first pipe inlet 311 being close to the bottom battery pack as an example, the cooling effect of the first pipe 31 on the bottom battery pack is significantly better than that on the top battery pack, and the cooling effect of the second pipe 32 on the top battery pack is significantly better than that on the bottom battery pack. Therefore, the combined cooling effect of the first pipe 31 and the second pipe 32 on the top battery pack is essentially the same as that on the bottom battery pack, thus effectively improving the temperature uniformity of the top and bottom battery packs.

[0047] The cooling medium flows from the pipe interface 21 of the cooler 2 into the first pipe inlet 311, flows from the bottom to the top of the battery cluster within the first pipe 31, and flows into the second pipe inlet 321 through the first pipe outlet 312, flowing from the top to the bottom of the battery cluster within the second pipe 32. In related technologies, the cooling duct is located at the top of the battery cluster, and the cooling air flows from the top to the bottom of the battery cluster. In this application, the first pipe inlet 311 is located at the bottom of the battery cluster, and the cooling air flows from the bottom to the top of the battery cluster within the first pipe 31. The upward flow of the cooling duct is more conducive to the filling of the cooling air within the first pipe 31, that is, the cooling air will preferentially fill the lower part of the first pipe 31 before continuing to flow upward, thereby increasing the air volume of the cooling pipe 3.

[0048] For the same battery pack 12, it simultaneously receives cooling air from the first pipe 31 and the second pipe 32. If the battery pack 12 is farther away from the first pipe 31, then the battery pack 12 is closer to the second pipe 32. Therefore, for each battery in the same layer of the battery pack, the cooling air volume and temperature received by each battery from the first pipe 31 and the second pipe 32 are basically the same, which can minimize the overall temperature of the same layer of the battery pack and increase the service life of the battery cluster.

[0049] In some embodiments, continue to refer to Figure 1 and Figure 2 At least a portion of the first conduit 31 and at least a portion of the second conduit 32 are both configured to extend along the height direction z of the energy storage system. The battery cluster 1 includes n battery packs. The first conduit 31 can supply cooling for the n battery packs along the height direction of the energy storage system, and the second conduit 32 can supply cooling for the n battery packs along the height direction of the energy storage system.

[0050] By extending the first pipe 31 and the second pipe 32 along the height direction of the energy storage system, the n-layer battery pack can be cooled simultaneously, so that all n-layer battery packs of the battery cluster can be adequately cooled.

[0051] In some embodiments, reference Figure 3 The first duct 31 includes multiple sets of first air outlets 313, with each set containing at least one first air outlet 313. Each set of first air outlets 313 is configured to cool one layer of battery pack 12. The number of sets of first air outlets 313 in the first duct 31 is equal to the number of layers of battery pack 12 contained in the battery cluster 1. Each layer of battery pack 12 is provided with multiple vents 13, and each set of first air outlets 313 is positioned opposite to a portion of the vents 13 in each layer of battery pack 12.

[0052] The second duct 32 includes multiple sets of second air outlets 323, with each set containing at least one second air outlet 323. Each set of second air outlets 323 is configured to cool one layer of battery pack 12. The number of sets of second air outlets 323 in the second duct 32 is equal to the number of layers of battery pack 12 contained in the battery cluster 1. Each set of second air outlets 323 is positioned opposite to a portion of the ventilation openings 13 of each layer of battery pack 12.

[0053] In one specific embodiment, the battery cluster 1 has 8 battery pack layers, each battery pack layer has 5 vents 13, and the first duct 31 has 8 sets of first air outlets 313, each set of first air outlets 313 containing 2 first air outlets 313. The second duct 32 has 8 sets of second air outlets 323, each set of second air outlets 323 containing 2 second air outlets 323. For the same battery pack layer 12, the two vents 13 on the left side of the battery pack 12 are configured to receive cooling air from the two first air outlets 313 of the first duct 31, and the two vents 13 on the right side of the battery pack 12 are configured to receive cooling air from the two second air outlets 323 of the second duct 32. The cross-sectional area of ​​the first air outlets 313 is the same as that of the second air outlets 323, so that the cooling effect of the left battery of the battery pack 12 on the first duct 31 is basically the same as the cooling effect of the right battery of the battery pack on the second duct 32.

[0054] In some embodiments, the number of first air outlets included in each group of first air outlets 313 is n1, the number of second air outlets 323 included in each group of second air outlets 323 is n2, and the number of vents 13 in each battery pack is m. The sum of n1 and n2 is set to be no greater than m, so that each first air outlet 313 can basically correspond to one vent 13 and each second air outlet 323 can basically correspond to one vent 13, thereby improving the balance of the cooling effect of the first pipe 31 and the second pipe 32 on the same battery pack.

[0055] Continue to refer to Figure 2 and Figure 3 The first pipe 31 includes a bent interface section 315 and a cooling section 314. The cooling section 314 is configured to be substantially parallel to the plane where the battery cluster 1 is located. The interface section 315 is a bent section, with one end connected to the pipe interface 21 of the cooler 2 and the other end connected to the cooling section 314. The second pipe 32 is configured to be substantially parallel to the plane where the battery cluster 1 is located, such that the distance between the cooling section 314 of the first pipe 31 and the battery pack is substantially the same as the distance between the second pipe 32 and the battery pack.

[0056] In yet another embodiment provided in this application, reference is made to Figures 4 to 6The first pipe 31 is provided with multiple first interfaces 316, the second pipe 32 is provided with multiple second interfaces 324, and the cooling pipe 3 also includes multiple connecting branches 33. One end of each connecting branch 33 is connected to the first interface 316, and the other end of each connecting branch 33 is connected to the second interface 324. The multiple connecting branches 33 are arranged at intervals along the height direction z of the energy storage system.

[0057] When cooling air flows from the first duct 31 through the bottom battery pack, it flows in three paths. The first path supplies the left battery pack through the first outlet 313 on the first duct 31. The second path enters the second duct 32 through the connecting pipe 33 and supplies the right battery pack through the second outlet 323 of the second duct 32. The third path continues upward through the first duct 31 and enters the second duct 32, flowing downward to the bottom of the second duct 32 and supplying the right battery pack through the second outlet 323. By setting the connecting pipe 33, cooling air can be supplied to the second duct 32 for pre-cooling of the right battery pack in a short time, and then further cooled by the cooling air flowing into the second duct 32 through the inlet 321. This allows the right battery pack to maintain a temperature balance with the left battery pack in a short time, providing temperature uniformity within the same battery pack layer.

[0058] Correspondingly, when cooling air flows from the first duct 31 through the intermediate battery pack, it flows in three paths. The first path supplies the left battery pack of the intermediate battery pack through the first outlet 313 on the first duct 31. The second path enters the second duct 32 through the connecting branch pipe 33 and supplies the right battery pack of the intermediate battery pack through the second outlet 323 of the second duct 32. The third path continues to flow upward through the first duct 31 and enters the second duct 32, flowing downward to the middle of the second duct 32 and supplying the right battery pack of the intermediate battery pack through the second outlet 323 of the second duct 32. By setting the connecting branch pipe 33, cooling air can be supplied to the second duct 32 for pre-cooling of the right battery pack of the intermediate battery pack in a short time, and then further cooled by the cooling air flowing into the second duct 32 through the inlet 321 of the second duct. This allows the right battery pack of the intermediate battery pack to maintain a temperature balance with the left battery pack in a short time, improving the temperature uniformity of the battery pack in the same layer.

[0059] In some embodiments, each connecting pipe 33 corresponds to one layer of battery pack 12. The battery cluster includes m layers of battery packs 12, and the number of connecting pipes 33 is set to n, where n is less than or equal to m, 2≤n≤8, and 3≤m≤8. In a specific implementation, the cooling pipe 3 is U-shaped, and the connection between the first pipe 31 and the second pipe 32 corresponds to the top layer battery pack 124. Except for the top layer battery pack 124, each layer of battery pack 12 corresponds to a connecting pipe 33, so that the right side batteries of each layer of battery pack 12 can be pre-cooled by the cooling air flowing into the second pipe 32 through the connecting pipe 33, thereby improving the overall temperature uniformity of the battery cluster.

[0060] Continue to refer to Figure 4 and Figure 5 The first pipe inlet 311 is lower than the first pipe outlet 312, and the inner diameter of the multiple connecting branch pipes 33 gradually increases along the direction from the first pipe inlet 311 to the first pipe outlet 312.

[0061] Cooling air supplied by the cooler 2 is provided to and flows within the first duct 31. As the cooling air flows within the first duct 31, its temperature and flow rate gradually decrease from the bottom to the top of the battery cluster. Therefore, for the left-side batteries of the battery pack, the left-side batteries of the bottom battery pack receive a better cooling effect than the left-side batteries of the top battery pack. Similarly, as the cooling air flows within the second duct 32, its temperature and flow rate gradually decrease from the top to the bottom of the battery cluster. Therefore, for the right-side batteries of the battery pack, the right-side batteries of the top battery pack receive a better cooling effect than the right-side batteries of the bottom battery pack. By gradually increasing the inner diameter of the multiple branch pipes 33 along the direction from the bottom end face 112 to the top end face 111 of the battery cluster 1, the inner diameter of the connecting branch pipes 33 near the bottom of the battery cluster is smaller, and the inner diameter of the connecting branch pipes 33 near the top of the battery cluster is larger. For the bottom battery packs, the cooling air temperature is lowest and the flow rate is highest. Therefore, a smaller diameter connecting pipe is sufficient to achieve a good pre-cooling effect with the lower flow rate. For battery packs near the top of the battery cluster, the cooling air temperature is higher and the flow rate is lower. Therefore, a larger diameter connecting pipe is needed to achieve a better cooling effect with the higher flow rate. This ensures that the pre-cooling effect of the top and bottom connecting pipes is essentially the same, thus promoting temperature uniformity among the battery packs within the cluster.

[0062] In an alternative embodiment, the first pipe inlet 311 is higher than the first pipe outlet 312, and the inner diameter of the pipes of the plurality of connecting branches 33 gradually increases in the direction from the first pipe inlet 311 to the first pipe outlet 312.

[0063] In some embodiments, the connecting pipe 33 includes n connecting pipes, each including a top connecting pipe 332 and a bottom connecting pipe 331. The top connecting pipe 332 corresponds to the top battery pack 124, and the bottom connecting pipe 331 corresponds to the bottom battery pack 123. The inner diameter of the bottom connecting pipe 331 is R1, and the inner diameter of the top connecting pipe 332 is Rn. The n connecting pipes 33 also include an intermediate connecting pipe 333 corresponding to the Xth battery pack. The inner diameter of the intermediate connecting pipe 333 is Rx. When the first pipe inlet 311 is lower than the first pipe outlet 312, Rx satisfies the following relationship: Rx=R1+(X-1)×(Rn-R1)÷(n-1), 20mm≤R1≤50mm, 100mm≤Rn≤120mm, R1≤Rx≤Rn, n is a positive integer and n≥1, and m is a positive integer and m≥2.

[0064] In specific implementation, the inner diameter R1 of the bottom connecting pipe 331 can be 20mm, 30mm, 40mm, 50mm, or any value between any two of the above, or a range between any two of the above values. The inner diameter Rn of the top connecting pipe 332 can be 100mm, 105mm, 110mm, 115mm, 120mm, or any value between any two of the above, or a range between any two of the above values. The number of battery pack layers m can be any value among 2, 3, 4, 5, 6, 7, and 8, and the number of connecting branches n can be any value among 1, 2, 3, 4, 5, 6, 7, and 8.

[0065] It should be noted that each battery pack has a corresponding connecting branch pipe, and each battery pack and each connecting branch pipe are set in a one-to-one correspondence. When the cooling pipe 3 does not have a connecting branch pipe at the top battery pack 124 and / or the bottom battery pack 123 due to the connection structure requirements, the top connecting pipe 332 corresponding to the top battery pack 124 should be understood as the top connecting pipe 332 being the closest to the top battery pack relative to other connecting branch pipes, and the bottom connecting pipe 331 corresponding to the bottom battery pack 123 should be understood as the bottom connecting pipe 331 being the closest to the bottom connecting pipe relative to other connecting branch pipes.

[0066] In alternative embodiments, when the first pipe inlet 311 is higher than the first pipe outlet 312, Rx satisfies the following relationship: Rx=R1-(X-1)×(R1-Rn)÷(n-1), 20mm≤Rn≤50mm, 100mm≤R1≤120mm, Rn≤Rx≤R1, n is a positive integer and n≥1, m is a positive integer and m≥2.

[0067] In specific implementation, the inner diameter R1 of the bottom connecting pipe 331 can be 100mm, 105mm, 110mm, 115mm, 120mm, or any value between any two of the above, or a range between any two of the above values. The inner diameter Rn of the top connecting pipe 332 can be 20mm, 30mm, 40mm, 50mm, or any value between any two of the above, or a range between any two of the above values. The number of battery pack layers m can be any value from 2, 3, 4, 5, 6, 7, 8, and the number of connecting branches n can be any value from 1, 2, 3, 4, 5, 6, 7, 8.

[0068] An embodiment of this application also provides a cooling module, which includes the cooling pipes and cooler provided in the above embodiments.

[0069] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An energy storage system, characterized in that, include: At least one battery cluster, the battery cluster comprising multiple battery packs spaced apart along the height direction of the energy storage system, each battery pack comprising a first end and a second end opposite to each other along the width direction or the length direction of the energy storage system; Refrigerator, including pipe connections; A cooling pipe, comprising a first pipe and a second pipe, wherein the inlet of the first pipe is connected to the pipe interface and the outlet of the first pipe is connected to the inlet of the second pipe; The first pipe and the second pipe are spaced apart along the width direction or the length direction of the energy storage system. The first pipe is positioned closer to the first end than the second pipe, and the second pipe is positioned closer to the second end than the first pipe. The battery pack in the same layer is cooled by both the first pipe and the second pipe.

2. The energy storage system according to claim 1, characterized in that, The battery cluster includes a top surface and a bottom surface arranged along the height direction of the energy storage system. At least a portion of the first pipe and at least a portion of the second pipe are both arranged to extend between the top surface and the bottom surface. The flow direction of the cooling medium in the first pipe is opposite to the flow direction of the second pipe.

3. The energy storage system according to claim 2, characterized in that, The first pipe includes a bend-connected interface section and a cooling section. One end of the interface section is connected to the pipe interface, and the other end of the interface section is connected to the cooling section. The cooling section is connected to the second pipe.

4. The energy storage system according to claim 2, characterized in that, The first pipe is provided with multiple first interfaces, the second pipe is provided with multiple second interfaces, and the cooling pipe further includes multiple connecting branch pipes; wherein, each of the connecting branch pipes is connected to the corresponding first interface and the corresponding second interface, and the multiple connecting branch pipes are spaced apart along the height direction of the energy storage system.

5. The energy storage system according to claim 4, characterized in that, The outlet of the first pipe is higher than the inlet of the first pipe, and the inner diameter of the plurality of connecting branch pipes gradually increases along the direction from the inlet of the first pipe to the outlet of the first pipe; or, the outlet of the first pipe is lower than the inlet of the first pipe, and the inner diameter of the plurality of connecting branch pipes gradually increases along the direction from the inlet of the first pipe to the outlet of the first pipe.

6. The energy storage system according to claim 5, characterized in that, The battery pack has m layers, and the m-layer battery pack includes a bottom battery pack located at the bottom of the battery cluster and a top battery pack located at the top of the battery cluster. The number of connecting pipes is n, and the n connecting pipes include top connecting pipes and bottom connecting pipes. The top connecting pipe corresponds to the top battery pack, and the bottom connecting pipe corresponds to the bottom battery pack. The diameter of the bottom connecting pipe is R1, and the diameter of the top connecting pipe is Rn. The n connecting pipes also include intermediate connecting pipes corresponding to the Xth layer of the battery pack. The diameter of the intermediate connecting pipe is Rx, and Rx satisfies the following relationship: Rx = R1 + (X-1) × (Rn-R1) ÷ (n-1), 20mm ≤ R1 ≤ 50mm, 100mm ≤ Rn ≤ 120mm, R1 ≤ Rx ≤ Rn; or, Rx satisfies the following relationship: Rx = R1 - (X-1) × (R1 - Rn) ÷ (n-1), 20mm ≤ Rn ≤ 50mm, 100mm ≤ R1 ≤ 120mm, Rn ≤ Rx ≤ R1, n is a positive integer and n ≥ 2, m is a positive integer and m ≥ 3.

7. The energy storage system according to any one of claims 1-6, characterized in that, The first duct is provided with multiple sets of first air outlets, and the second duct is provided with multiple sets of second air outlets. Each set of first air outlets and the corresponding set of second air outlets are configured to face the same battery pack. The number of first air outlets in each set is n1, the number of second air outlets in each set is n2, each layer of the battery pack is provided with multiple ventilation openings, and the number of ventilation openings in each layer of the battery pack is m1. The sum of n1 and n2 is set to be no greater than m1.

8. The energy storage system according to any one of claims 1-6, characterized in that, The cooling pipe is U-shaped.

9. A cooling pipe for an energy storage system, characterized in that, The cooling pipe includes the cooling pipe of the energy storage system according to any one of claims 1-8.

10. A cooling module for an energy storage system, characterized in that, The cooling module includes the cooling pipes and cooler of the energy storage system according to any one of claims 1-8.

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