Energy storage cabinet cooling system and energy storage cabinet

Abstract

The utility model relates to an energy storage cabinet cooling system and an energy storage cabinet, and relates to the technical field of energy storage cabinets. The cooling device is used for cooling a plurality of battery packs in the energy storage cabinet. The energy storage cabinet cooling system comprises a direct cooling unit, a plurality of direct cooling plates and a flow guide pipeline. The flow guide pipeline comprises a main pipeline and a plurality of capillary pipelines, the capillary pipelines are connected to the main pipeline, the main pipeline communicates with the direct cooling unit, and the ends, away from the main pipeline, of the capillary pipelines correspondingly communicate with the direct cooling plates. The capillary pipeline is provided with a winding part, and the length of the winding part on the capillary pipeline corresponding to the direct cooling plate is sequentially shortened along with gradual increase of the distance between the direct cooling plate and the main pipeline, so that the distances from the direct cooling plates to the direct cooling unit through the capillary pipeline and the main pipeline are the same. The energy storage cabinet cooling system provided by the utility model can solve the problems of low cooling efficiency and large temperature difference of the energy storage cabinet caused by non-uniform cooling in air cooling and liquid cooling in the prior art.

Description

TECHNICAL FIELD

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

[0002] The energy storage cabinet is a commonly used energy storage device in the prior art, mainly used for storing and functioning electric energy, and used to solve the problem of imbalance between power supply and demand. At the same time, the energy storage cabinet will generate heat during use, so a heat management system needs to be set up to dissipate heat and cool down.

[0003] In the prior art, the energy storage cabinet mainly adopts two heat dissipation and cooling methods, air cooling and liquid cooling. However, the above two cooling methods have certain problems. Among them, the cooling efficiency of air cooling is low, and due to air resistance and other reasons, the heat dissipation efficiency of the battery near the end of the air duct is poor. While the cooling efficiency of liquid cooling is higher than that of air cooling, but liquid cooling needs to drive the circulation of cooling liquid, resulting in high overall energy consumption and high cost, and there is also a problem of large temperature difference between the inlet and outlet of the cooling liquid.

[0004] Therefore, it is urgent to provide an energy storage cabinet cooling structure that can solve the problems of low cooling efficiency and uneven cooling in the prior art, which leads to large temperature difference of the energy storage cabinet. Content of the utility model

[0005] The purpose of the present application is to provide an energy storage cabinet cooling system and an energy storage cabinet, which can solve the problems of low cooling efficiency and uneven cooling in the prior art, which leads to large temperature difference of the energy storage cabinet.

[0006] In order to achieve the above purpose, the first aspect of the present application provides an energy storage cabinet cooling system for dissipating heat and cooling a plurality of battery packs in an energy storage cabinet. The energy storage cabinet cooling system comprises a direct cooling unit, a plurality of direct cooling plates and a flow guide pipeline. The flow guide pipeline comprises a main pipeline and a plurality of capillary pipelines, the plurality of capillary pipelines are connected to the main pipeline respectively, the main pipeline is in communication with the direct cooling unit, and the end of the capillary pipeline away from the main pipeline is in communication with the direct cooling plate correspondingly. Wherein, the capillary pipeline has a winding part, and as the distance between the direct cooling plate and the main pipeline gradually increases, the length of the winding part on the capillary pipeline corresponding to the direct cooling plate is shortened in turn, so that the distance from each direct cooling plate to the direct cooling unit through the capillary pipeline and the main pipeline is the same.

[0007] Based on the above embodiments of the present application, when the energy storage cabinet is in use, the direct cooling system composed of the direct cooling unit and other modules is used to replace the air cooling system and the liquid cooling system in the prior art. Compared with the air cooling system, the direct cooling system has higher heat conduction efficiency, and thus has higher cooling efficiency. Compared with the liquid cooling system, the direct cooling system reduces the intermediate heat conduction structure, thereby improving the heat conduction efficiency and the heat dissipation and cooling efficiency. Further, the capillary pipeline is connected to the direct cooling plate, and the direct cooling plate is correspondingly attached to the battery pack for heat dissipation and cooling. In this process, by arranging the winding part, the length of the winding part on the capillary pipeline closer to the direct cooling unit is longer, thereby ensuring that the path lengths of the refrigerant flowing through the direct cooling plate and the direct cooling unit are consistent, eliminating the length redundancy of the capillary pipeline in the pipeline arrangement, and achieving the technical effects of reducing the temperature difference between the battery packs and improving the temperature uniformity of the entire energy storage cabinet. In addition, the pipeline arrangement and installation are facilitated.

[0008] In some embodiments of the present application, the winding part is arranged as at least one annular structure, and the number of annular structures on the corresponding capillary pipeline gradually decreases as the distance between the direct cooling plate and the main pipeline gradually increases.

[0009] Based on the above embodiments of the present application, by arranging the winding part as an annular structure, compared with arranging it as a rectangular or other shape, the annular structure is not only more convenient to wind, but also can avoid stress concentration to some extent, thereby avoiding damage to the capillary pipeline during winding and affecting the heat dissipation and cooling effect. At the same time, by increasing or decreasing the number of annular structures to adjust the length of the winding part, the control of the length of the winding part is facilitated, and the control of the path length between the direct cooling plate and the direct cooling unit is facilitated.

[0010] In some embodiments of the present application, the diameters of the annular structures on each capillary pipeline are the same.

[0011] Based on the above embodiments of the present application, by arranging the diameters of the annular structures on each capillary pipeline to be the same, the length difference between the winding parts on each capillary pipeline is only in the number of annular structures. At the same time, the length of each annular structure is fixed, and thus the length difference of the winding parts on each capillary pipeline can be further adjusted.

[0012] In some embodiments of the present application, when at least two annular structures are arranged on the same capillary pipeline, the annular structures are arranged on the same axis.

[0013] Based on the above-mentioned embodiments of the present application, when multiple annular structures are arranged on a single capillary pipe, the multiple annular structures overlap to form a coiled structure similar to a spring, thereby reducing the overall space occupation of the coiled part.

[0014] In some embodiments of the present application, the distances between the multiple straight cooling plates and the main pipe form an arithmetic progression.

[0015] Based on the above-mentioned embodiments of the present application, the distances between the main pipes and the straight cooling plates form an arithmetic progression, that is, the distance differences between any two adjacent straight cooling plates and the main pipe are equal. This facilitates the setting of the length of the coiled part, thereby achieving the technical effect of making the distances of the refrigerant flowing from the straight cooling unit to each straight cooling plate approximately equal.

[0016] In some embodiments of the present application, a reinforcing rib is arranged in the capillary pipe, and the reinforcing rib is arranged in the same direction as the axis of the capillary pipe.

[0017] Based on the above-mentioned embodiments of the present application, by arranging the reinforcing rib, the capillary pipe can be reinforced, thereby avoiding the occurrence of necking or bending of the capillary pipe to some extent during coiling or welding, and further avoiding the blockage of the capillary pipe. At the same time, by arranging the reinforcing rib in the same direction as the axis of the capillary pipe, the influence of the reinforcing rib on the flow of the refrigerant can be reduced, thereby reducing the influence on the overall cooling effect of the cooling system.

[0018] In some embodiments of the present application, the cross-sectional shape of the reinforcing rib along the direction of the capillary pipe is any one of a strip shape, a cross shape, and a rectangular shape.

[0019] Based on the above-mentioned embodiments of the present application, by limiting the shape of the reinforcing rib in the capillary pipe, the strength of the capillary pipe can be strengthened, and the influence on the flow of the refrigerant can be minimized.

[0020] In some embodiments of the present application, an expansion section is formed at one end of the capillary pipe close to the main pipe, and the diameter of the expansion section is greater than the diameter of the capillary pipe at other positions.

[0021] Based on the above-mentioned embodiments of the present application, by forming an expansion section at one end of the capillary pipe close to the main pipe, that is, at the connection position of the capillary pipe and the main pipe, the diameter of the capillary pipe at this position is increased. This can to some extent avoid the occurrence of necking or blockage by welding slag at the connection position of the capillary pipe and the main pipe, thereby reducing the influence on the flow of the refrigerant.

[0022] In some embodiments of the present application, a transition section is formed at the position of the capillary pipe connected to the expansion section, and the diameter of the transition section gradually increases towards the position close to the expansion section.

[0023] Based on the above-mentioned embodiments of the present application, by forming a transition section between the expansion section and the main part of the capillary pipe, on the one hand, the connection between the expansion section and the main part of the capillary pipe is smoother, reducing the impact on the flow of refrigerant, thereby ensuring the heat exchange cooling efficiency. On the other hand, it can also make the connection between the expansion section and the main part of the capillary pipe more stable, to some extent, avoid the problem of necking or bending at the connection position.

[0024] According to a second aspect of the present application, a storage energy cabinet is provided, which comprises a cabinet body, a plurality of battery packs and the above-mentioned storage energy cabinet cooling system. The cabinet body forms an accommodating cavity inside, and the plurality of battery packs are respectively arranged in the accommodating cavity, and the plurality of direct cooling plates are respectively arranged corresponding to the battery packs.

[0025] Based on the above-mentioned embodiments of the present application, the storage energy cabinet provided by the present application comprises the above-mentioned storage energy cabinet cooling system. Through the above-mentioned arrangement, the direct cooling cooling mode is used to replace the air cooling and liquid cooling modes in the prior art, thereby improving the cooling efficiency. Further, by arranging the direct cooling plate and the capillary pipe to be connected to each battery pack for heat dissipation cooling, the length of the capillary pipe is adjusted by the arrangement of the winding part, thereby adjusting the path length of the refrigerant flowing between different direct cooling plates and direct cooling units, so that the path length of the refrigerant flowing to each direct cooling plate is basically consistent, thereby making the temperature state of each direct cooling plate consistent. Further, the temperature difference between each battery pack is reduced, and the technical effect of improving the temperature uniformity of the whole storage energy cabinet is achieved.

[0026] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the present application, but do not constitute a limitation on the present application. In the drawings:

[0028] Figure 1 is a structural schematic diagram of the storage energy cabinet cooling system provided by the embodiments of the present application.

[0029] Figure 2 is a structural schematic diagram of the flow guide pipe in the storage energy cabinet cooling system provided by the embodiments of the present application.

[0030] Figure 3 is a structural schematic diagram of the capillary pipe in the storage energy cabinet cooling system provided by the embodiments of the present application.

[0031] Figure 4 is a structural schematic diagram of the capillary pipe in the storage energy cabinet cooling system provided by the embodiments of the present application.

[0032] Figure 5is Figure 2 Enlarged schematic view of part A.

[0033] Reference Signs List

[0034] 2, straight cooling plate; 3, main pipe; 4, capillary pipe; 41, winding part; 411, ring structure; 42, reinforcing rib; 43, expansion section; 44, transition section; 45, first pipe section; 46, second pipe section; 5, battery pack; 6, return pipe. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0036] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of the present application.

[0038] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present application, it should be noted that, without making the opposite statement, the orientation or position relationship indicated by the terms "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the product of the present application is used, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of 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.

[0041] In the prior art, the energy storage box mainly adopts two heat dissipation cooling methods of air cooling and liquid cooling. However, the above two cooling methods have certain problems. Among them, the cooling efficiency of air cooling is low, and due to air resistance and other reasons, the battery near the end of the air duct has poor heat dissipation efficiency. While the cooling efficiency of liquid cooling is higher than that of air cooling, but the liquid cooling needs to drive the circulation of the cooling liquid, resulting in large overall energy consumption and high cost, and there is also a large temperature difference between the inlet and outlet of the cooling liquid.

[0042] Specifically, when the energy storage box adopts the air cooling method, at this time, due to the relatively low heat conduction efficiency of air, the overall cooling effect of air cooling is poor. While the liquid cooling has higher heat conduction efficiency than air, so the cooling effect is also better than air cooling. However, the liquid cooling system usually needs to set a plate heat exchanger as an intermediate heat conduction structure, and this process will affect the cooling efficiency of the liquid cooling system. At the same time, during the circulation of the cooling liquid, there is a large temperature difference between the inlet and outlet of the cooling liquid, which further causes a large difference in heat exchange effect between different batteries, resulting in a large temperature difference between each region in the energy storage box, affecting the overall use of the energy storage box.

[0043] In order to solve the above problems in the prior art, according to the first aspect of the present application, the present application provides a kind of energy storage cabinet cooling system, for the heat dissipation cooling of multiple battery packs 5 in energy storage cabinet. Referring to Figures 1 to 3 The energy storage cabinet cooling system includes a direct cooling unit (not shown) and a plurality of direct cooling plates 2 and a flow guide pipeline. The flow guide pipeline includes a main pipeline 3 and a plurality of capillary pipelines 4, the plurality of capillary pipelines 4 are connected to the main pipeline 3, the main pipeline 3 is in communication with the direct cooling unit, and the end of the capillary pipeline 4 away from the main pipeline 3 is in communication with the direct cooling plate 2. Wherein, the capillary pipeline 4 has a winding part 41, and as the distance between the direct cooling plate 2 and the main pipeline 3 gradually increases, the length of the winding part 41 on the capillary pipeline 4 corresponding to the direct cooling plate 2 is shortened in turn, so that the path length of each direct cooling plate 2 to the direct cooling unit through the capillary pipeline 4 and the main pipeline 3 is the same.

[0044] Based on the above embodiments of the present application, the energy storage cabinet is used, and the direct cooling system composed of the direct cooling unit and other modules is used to replace the air cooling system and the liquid cooling system in the prior art. Compared with the air cooling system, the direct cooling system has higher heat conduction efficiency, and thus has higher cooling efficiency. Compared with the liquid cooling system, the direct cooling system reduces the intermediate heat conduction structure, thereby improving the heat conduction efficiency and the heat dissipation and cooling efficiency.

[0045] Further, the capillary pipeline 4 is connected to the direct cooling plate 2, and the direct cooling plate 2 is attached to the battery pack 5 for heat dissipation and cooling. In this process, by arranging the winding part 41, the length of the winding part 41 on the capillary pipeline 4 is longer as it is closer to the direct cooling unit, thereby ensuring that the path length of the refrigerant flowing between each direct cooling plate 2 and the direct cooling unit is consistent, and eliminating the length redundancy of the capillary pipeline 4 when the pipeline is arranged. Thus, the path length of the refrigerant flowing to each direct cooling plate 2 is basically consistent, the temperature state of each direct cooling plate 2 tends to be consistent, thereby reducing the temperature difference between each battery pack 5 and improving the temperature uniformity of the entire energy storage cabinet. In addition, the pipeline arrangement and installation are facilitated.

[0046] Specifically, when the energy storage cabinet cooling system is used, the direct cooling unit outputs low-temperature liquid refrigerant, which then flows to the flow guide pipeline, is divided into each capillary pipeline 4 through the connection of the main pipeline 3 and each capillary pipeline 4, and then flows into each direct cooling plate 2, respectively, and removes heat through the heat conduction between the direct cooling plate 2 and the battery pack 5, thereby cooling each battery pack 5.

[0047] In this process, the refrigerant needs to first flow into the main pipeline 3, then flow into the capillary pipeline 4 from the connection position of the main pipeline 3 and the capillary pipeline 4, and finally flow into the direct cooling plate 2 when flowing from the direct cooling unit to the direct cooling plate 2. Therefore, the path length L of the refrigerant flowing from the direct cooling unit to the direct cooling plate 2 is the sum of the length of the main pipeline 3 and the length of the capillary pipeline 4 corresponding to the direct cooling plate 2. Further referring to Figure 2 and Figure 3 The capillary pipeline 4 can be further divided into a first pipe segment 45 and a second pipe segment 46, wherein the first pipe segment 45 refers to the part from the end of the capillary pipeline 4 connected to the main pipeline 3 to the bending part in the direction of the main pipeline 3, and the second pipe segment 46 refers to the remaining part of the capillary pipeline 4, i.e. from the bending part to the end of the capillary pipeline 4 connected to the direct cooling plate 2. At this time, the length of the main pipeline 3 itself is L1, the length of the first pipe segment 45 is L2, and the length of the second pipe segment 46 is L3. Therefore, the path length of the refrigerant flowing from the direct cooling unit to the direct cooling plate 2 is the sum of L1, L2 and L3.

[0048] Further, referring to Figure 2 and Figure 3As can be seen from the above, among the lengths, the length L1 of the main pipe 3 itself remains unchanged, and because the battery packs 5 of the energy storage cabinet are usually arranged in a certain order, for example, in an array, the length L2 of the first pipe segment 45 in the capillary pipe 4 corresponding to the multiple straight cooling plates 2 from top to bottom gradually increases. At this time, in order to ensure that the path length L from each straight cooling plate 2 to the straight cooling unit remains consistent, the length of the second pipe segment 46 L3 needs to be shortened accordingly. When the battery packs 5 are arranged in an array, the length of the first pipe segment 45 from the multiple straight cooling plates 2 from top to bottom should remain consistent. At this time, the different lengths of the second pipe segment 46 will cause length redundancy when the pipe is arranged, thereby affecting the wiring and installation process. Through the arrangement of the winding part 41, the redundant length of the second pipe segment 46 can be wound and stored, thereby ensuring that the path length of the refrigerant flowing to each straight cooling plate 2 is consistent, and facilitating the wiring and installation of the capillary pipe 4.

[0049] In addition, it should be noted that the "distance of the straight cooling plate 2 to the main pipe 3" in the present application refers to the assembly distance of the straight cooling plate 2 to the main pipe 3. For example, when the straight cooling plate 2 and the main pipe 3 are arranged in a straight line, the straight line distance between them at this time is the assembly distance. When the straight cooling plate 2 and the main pipe 3 are arranged in an L-shaped wiring as shown in Figure 2 and Figure 3 , the assembly distance between the straight cooling plate 2 and the main pipe 3 includes the length L2 of the first pipe segment 45 itself and the assembly length L4 between the first pipe segment 45 and the straight cooling plate 2. The difference between the length L3 of the second pipe segment 46 itself and the assembly length L4 is the redundant length of the capillary pipe 4 when it is assembled, that is, the length of the winding part 41 itself.

[0050] In addition, it should be noted that in the present application, the existing liquid cooling and air cooling methods are replaced by straight cooling to improve the cooling efficiency, and the temperature difference between the battery packs 5 during cooling is reduced by improving the structure of the capillary pipe 4, so that the temperature of the entire energy storage cabinet is more uniform. The type of refrigerant used in the energy storage cabinet cooling system is not limited. Any suitable refrigerant type can be selected according to the cooling requirements, such as Freon, propane, and isobutane, etc. The present application does not make specific limitations.

[0051] In the present application, the specific shape and structure of the winding part 41 can be selected in any suitable manner.

[0052] Referring to Figure 2 and Figure 3 , in some embodiments of the present application, the winding part 41 can be arranged as at least one ring structure 411, and as the distance of the straight cooling plate 2 to the main pipe 3 gradually increases, the number of rings of the ring structure 411 on the corresponding capillary pipe 4 gradually decreases.

[0053] Based on the above-mentioned embodiments of the present application, by specifically arranging the winding part 41 as the annular structure 411, compared with being arranged as a rectangular or other shape, the annular structure 411 is not only more convenient to wind and form, but also can avoid stress concentration to a certain extent, thereby avoiding damage to the capillary pipe 4 in the winding process and avoiding affecting the cooling effect. At the same time, by increasing or decreasing the number of turns of the annular structure 411 to adjust the length of the winding part 41, it is convenient to control the length of the winding part 41, and further to control the path length between each direct cooling plate 2 and the direct cooling unit.

[0054] Further, in some other embodiments of the present application, the diameters of the annular structures 411 on each capillary pipe 4 are the same.

[0055] Based on the above-mentioned embodiments of the present application, by arranging the diameters of the annular structures 411 on each capillary pipe 4 to be the same, at this time the length difference between the winding parts 41 on each capillary pipe 4 is only in the number of turns of the annular structure 411. At the same time, at this time the length of each turn of the annular structure is fixed, so it is further convenient to adjust the length difference of the winding part 41 on each capillary pipe 4.

[0056] Specifically, through the above arrangement, the diameter of the annular structure 411 is fixed, so that the circumference of the annular structure 411 is fixed. For example, the circumference of the annular structure 411 is fixed to 10 cm, at this time when the capillary pipe 4 itself has a redundant length of 20 cm, only two turns of the annular structure 411 need to be arranged. By analogy, when the redundant length of the capillary pipe 4 is increased to 30 cm, 40 cm and 50 cm in turn, the number of turns of the annular structure 411 can be increased to three, four and five in turn.

[0057] In addition, it should be noted that in the present application, the winding part 41 is specifically arranged as the annular structure 411, on the one hand, considering that the annular structure 411 is easy to wind and form, on the other hand, because the annular structure 411 is more smooth when winding, it can avoid the problem of bending and necking of the capillary pipe 4 to a certain extent. In actual use, the winding part 41 can also be specifically arranged as an elliptical structure, a rectangular structure and a triangular structure, and when arranged as a rectangular structure or a triangular structure, a circular arc transition structure can be arranged at the bending position to reduce the possibility of bending and necking of the capillary pipe 4. In actual use, the specific shape of the winding part 41 can be arranged according to the space arrangement of the energy storage cabinet, and the present application does not make specific limitations.

[0058] Reference Figure 2 and Figure 3As shown in the drawings, in some embodiments of the present application, at least two annular structures 411 are arranged on the same capillary pipe 4, and the annular structures 411 can be coaxially arranged.

[0059] Based on the above-mentioned embodiments of the present application, when multiple annular structures 411 are arranged on a single capillary pipe 4, the multiple annular structures 411 are overlapped to form a coiled structure similar to a spring, thereby reducing the overall space occupation of the coiled portion 41.

[0060] In some embodiments of the present application, the distances between the multiple straight cooling plates 2 and the main pipe 3 form an arithmetic progression.

[0061] Based on the above-mentioned embodiments of the present application, the distances between each main pipe 3 and the straight cooling plate 2 form an arithmetic progression, that is, the distance difference between any two adjacent straight cooling plates 2 and the main pipe 3 is equal. Therefore, the length of the coiled portion 41 can be easily set, thereby achieving the technical effect that the distance of the refrigerant flowing from the straight cooling unit to each straight cooling plate 2 is approximately equal.

[0062] Specifically, when the distances between each straight cooling plate 2 and the main pipe 3 form an arithmetic progression, the lengths L2 of the first pipe segments 45 in each capillary pipe 4 form an arithmetic progression, and the lengths L3 of the corresponding second pipe segments 46 also form an arithmetic progression, thereby forming an arithmetic progression of the redundant lengths of each capillary pipe 4 during assembly. For example, when the length of the capillary pipe 4 itself is set to 50 cm and the assembly length L4 is 10 cm, and three capillary pipes 4 are provided, the lengths of the first pipe segments 45 in the three capillary pipes 4 are 10 cm, 20 cm and 30 cm, respectively, and the lengths of the corresponding second pipe segments 46 are 40 cm, 30 cm and 20 cm, respectively. At this time, the length redundancies of each capillary pipe 4 are 30 cm, 20 cm and 10 cm, respectively.

[0063] Further, in actual design, the difference in length redundancy between any two adjacent capillary pipes 4 can be set to an integer multiple of the circumference of the annular structure 411. For example, in the above example, when the length redundancies of the three capillary pipes 4 are 30 cm, 20 cm and 10 cm, respectively, the difference in length redundancy between any two adjacent capillary pipes 4 is 10 cm, and the circumference of the annular structure 411 can be set to 5 cm. Therefore, the length redundancy in pipe arrangement can be eliminated by sequentially arranging six, four and two annular structures 411, so that the pipe arrangement process is more simple and fast.

[0064] In the present application, the capillary pipe 4 can be specifically arranged in any suitable structure.

[0065] Reference Figure 2As shown in FIG. 1, in an example embodiment provided by the present application, the capillary tube 4 can be provided with a reinforcing rib 42, and the reinforcing rib 42 is arranged in the same direction as the axial direction of the capillary tube 4.

[0066] Based on the above-mentioned embodiments of the present application, by arranging the reinforcing rib 42, the capillary tube 4 can be reinforced, so as to avoid the capillary tube 4 from being narrowed or bent during winding or welding to some extent, and thus avoid the capillary tube 4 from being blocked. Meanwhile, by arranging the reinforcing rib 42 in the same direction as the axial direction of the capillary tube 4, the influence of the reinforcing rib 42 on the flow of refrigerant can be reduced, and thus the influence on the overall cooling effect of the cooling system can be reduced.

[0067] Specifically, the capillary tube 4 itself generally has a small hole diameter, and the inner diameter is usually less than 2 mm, so that the capillary tube 4 is prone to bending during winding or installation, and thus the capillary tube 4 may be locally narrowed or blocked, which affects the normal flow of refrigerant and thus affects the refrigeration effect. By arranging the reinforcing rib 42, the capillary tube 4 can be internally reinforced and supported, so as to avoid the capillary tube 4 from being bent to some extent, and reduce the possibility of uneven flow distribution caused by narrowing due to assembly, process, and external force.

[0068] Further, in some embodiments of the present application, the cross-sectional shape of the reinforcing rib 42 along the radial direction of the capillary tube 4 can be any one of a strip shape, a cross shape, and a rectangular shape.

[0069] Based on the above-mentioned embodiments of the present application, by limiting the shape of the reinforcing rib 42 in the capillary tube 4, the strength of the capillary tube 4 can be reinforced, and the influence on the flow of refrigerant can be minimized.

[0070] Specifically, the reinforcing rib 42 is arranged to mainly support and structurally reinforce the capillary tube 4. In comparison, the supporting effect of the cross shape and the rectangular shape is better than that of the strip shape, but the space occupation of the cross shape and the rectangular shape is also larger, so that the normal flow of refrigerant is affected to some extent. The specific use can be selected according to the actual use requirements, and the present application does not make specific limitations.

[0071] Reference Figure 3 As shown in FIG. 1, in some embodiments of the present application, the capillary tube 4 can be formed with an expansion section 43 at one end close to the main tube 3, and the diameter of the expansion section 43 is greater than the diameter of other positions of the capillary tube 4.

[0072] Based on the above-mentioned embodiments of the present application, by forming an expansion section 43 at the end of the capillary pipe 4 close to the main pipe 3, that is, at the connection position of the capillary pipe 4 and the main pipe 3, the diameter of the capillary pipe 4 at this position is increased. In this way, to some extent, the connection position of the capillary pipe 4 and the main pipe 3 is avoided from being narrowed or blocked by welding slag, thereby reducing the impact on the flow of refrigerant.

[0073] Further, in some embodiments of the present application, a transition section 44 is formed at the position of the capillary pipe 4 connected to the expansion section 43, and the diameter of the transition section 44 gradually increases towards the position close to the expansion section 43.

[0074] Based on the above-mentioned embodiments of the present application, by forming a transition section 44 between the expansion section 43 and the main body of the capillary pipe 4, on the one hand, the connection between the expansion section 43 and the main body of the capillary pipe 4 is smoother, reducing the impact on the flow of refrigerant, thereby ensuring the heat exchange and cooling efficiency. On the other hand, the connection between the expansion section 43 and the main body of the capillary pipe 4 is also more stable, to some extent, avoiding problems such as narrowing or bending at the connection position.

[0075] Specifically, the end of the capillary pipe 4 connected to the main pipe 3, that is, the inlet end of the capillary pipe 4, forms a trumpet-shaped opening structure through the cooperation of the expansion section 43 and the transition section 44, so that the refrigerant can flow into the capillary pipe 4 more smoothly. At the same time, the connection position of the capillary pipe 4 and the main pipe 3 needs to be fixed by welding or other methods, so welding slag will be generated. By providing the expansion section 43, the diameter of the capillary pipe 4 at this position is increased, thereby reducing the risk of blockage, and ensuring the normal flow of refrigerant and the refrigeration effect on each battery pack 5.

[0076] In addition, it should be noted that the energy storage cabinet cooling system in the present application is not limited to the above structure, and can be set according to actual use requirements. For example, as shown in Figure 2 Figure 3 Figure 4 Figure 5 Figure 1 In some other embodiments of the present application, the energy storage cabinet cooling system can also include a return pipe 6. The refrigerant flows to the direct cooling plate 2 through the main pipe 3 and the capillary pipe 4, and is cooled by heat conduction in the direct cooling plate 2 to absorb heat from the battery pack 5. Then, the refrigerant after heat absorption is transported back to the direct cooling unit through the return pipe 6, and is cooled again in the direct cooling unit before being output again. At the same time, the refrigerant may change phase during the heat absorption process, usually from liquid to gas, so in order to reduce the impact of pressure change on the return pipe 6, the diameter of the return pipe 6 can be appropriately increased.

[0077] According to a second aspect of the present application, a battery energy storage cabinet is provided, which comprises a cabinet body, a plurality of battery packs 5 and the above-mentioned battery energy storage cabinet cooling system. The cabinet body is internally formed with a receiving cavity, and the plurality of battery packs 5 are respectively arranged in the receiving cavity, and the plurality of direct cooling plates 2 are respectively arranged corresponding to the battery packs 5.

[0078] Based on the above-mentioned embodiments of the present application, the battery energy storage cabinet provided by the present application comprises the above-mentioned battery energy storage cabinet cooling system. Through the above-mentioned arrangement, the direct cooling cooling mode is used to replace the air cooling and liquid cooling modes in the prior art, thereby improving the cooling efficiency. Further, the direct cooling plate 2 and the capillary tube are respectively connected to each battery pack 5 for heat dissipation cooling. In this process, the length of the capillary tube 4 is adjusted by the arrangement of the winding part 41, so that the length redundancy of the capillary tube 4 in the pipeline arrangement is eliminated while ensuring that the path length of the refrigerant flowing between each direct cooling plate 2 and the direct cooling unit is consistent. Thus, the path length of the refrigerant flowing to each direct cooling plate 2 is substantially consistent, so that the temperature state of each direct cooling plate 2 tends to be consistent, thereby reducing the temperature difference between each battery pack 5 and improving the temperature uniformity of the entire battery energy storage cabinet. It is also convenient for the pipeline layout and installation.

[0079] In addition, it should be noted that the battery energy storage cabinet in the present application is not limited to the above structure. For example, a battery management system (BMS) can be used to monitor and control the input and output of the battery packs 5 in the battery energy storage cabinet. The specific arrangement can be set according to actual use requirements, and the present application does not make specific limitations thereto.

[0080] The preferred embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the specific details in the above-mentioned embodiments. Within the technical concept range of the present application, various simple modifications can be made to the technical solutions of the present application, and these simple modifications all belong to the protection range of the present application.

[0081] In addition, it should be noted that the battery energy storage cabinet in the present application is not limited to the above structure. For example, a battery management system (BMS) can be used to monitor and control the input and output of the battery packs 5 in the battery energy storage cabinet. The specific arrangement can be set according to actual use requirements, and the present application does not make specific limitations thereto.

[0082] In addition, the various different embodiments of the present application can be combined in any way, as long as they do not contradict the idea of the present application, and they should also be considered as disclosed by the present application.

Claims

1. An energy storage cabinet cooling system for cooling a plurality of battery packs within an energy storage cabinet, the energy storage cabinet cooling system comprising: The energy storage cabinet cooling system comprises: a direct cooling unit and a plurality of direct cooling plates; a flow guide pipeline comprising a main pipeline and a plurality of capillary pipelines, the plurality of capillary pipelines are respectively connected to the main pipeline, the main pipeline is in communication with the direct cooling unit, and the capillary pipelines are in communication with the direct cooling plates at one end away from the main pipeline; wherein the capillary pipeline has a winding part, and as the distance between the direct cooling plate and the main pipeline gradually increases, the length of the winding part on the capillary pipeline corresponding to the direct cooling plate gradually decreases in sequence, so that the distance from each direct cooling plate to the direct cooling unit through the capillary pipeline and the main pipeline is the same.

2. The energy storage vault cooling system of claim 1, wherein, The winding part is arranged as at least one annular structure, and as the distance between the direct cooling plate and the main pipeline gradually increases, the number of annular structures on the corresponding capillary pipeline gradually decreases.

3. The energy storage vault cooling system of claim 2, wherein, The annular structures on each capillary pipeline have the same diameter.

4. The energy storage vault cooling system of claim 2, wherein, When at least two annular structures are arranged on the same capillary pipeline, the annular structures are arranged coaxially.

5. The energy vault cooling system of claim 1, wherein, The distances between the plurality of direct cooling plates and the main pipeline form an arithmetic sequence in sequence.

6. The energy vault cooling system of any one of claims 1-5, wherein, A reinforcing rib is arranged in the capillary pipeline, and the reinforcing rib is arranged in the same direction as the axial direction of the capillary pipeline.

7. The energy vault cooling system of claim 6, wherein, The cross-sectional shape of the reinforcing rib along the capillary pipeline is arranged as any one of a strip shape, a cross shape, and a rectangular shape.

8. The energy vault cooling system of any one of claims 1-5, wherein, An expansion section is formed at one end of the capillary pipeline close to the main pipeline, and the diameter of the expansion section is greater than the diameter of the capillary pipeline at other positions.

9. The energy vault cooling system of claim 8, wherein, A transition section is formed at the position of the capillary pipeline connected to the expansion section, and the diameter of the transition section gradually increases towards the position close to the expansion section.

10. An energy storage cabinet characterized by, The energy storage cabinet comprises: a cabinet body, an accommodating cavity is formed in the cabinet body; a plurality of battery packs are respectively arranged in the accommodating cavity; and The energy storage cabinet cooling system according to any one of claims 1-9, and the plurality of direct cooling plates are respectively arranged in close contact with the battery packs.

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