Liquid cooling pipeline structure and energy storage system

Abstract

The utility model provides a liquid cooling pipeline structure and an energy storage system, and the liquid cooling pipeline structure is communicated between a liquid inlet and a liquid outlet of a cooling device, and comprises a liquid inlet pipe which comprises a liquid inlet main pipe communicated with the liquid outlet of the cooling device; the liquid return pipe comprises a liquid return main pipe communicated with the liquid inlet of the cooling device; the liquid return main pipe is higher than the liquid inlet main pipe relative to the horizontal plane, and the pipeline distance from the liquid inlet main pipe to the liquid outlet of the cooling device is equal to the pipeline distance from the liquid return main pipe to the liquid inlet of the cooling device; the liquid inlet pipe comprises a plurality of liquid inlet branch pipes communicated with the liquid inlet main pipe, and the liquid inlet branch pipes are arranged on the liquid inlet main pipe in the length direction of the liquid inlet main pipe; the liquid return pipe comprises a plurality of liquid return branch pipes communicated with the liquid return main pipe, and the liquid return branch pipes are arranged on the liquid return main pipe in the length direction of the liquid return main pipe; according to the pipeline structure, gas accumulated in the pipeline structure can be effectively exhausted, and it is ensured that the flow speed of cooling liquid in the pipeline structure is kept uniform.

Description

Technical Field

[0001] The present application belongs to the field of liquid cooling and heat dissipation technology, and specifically relates to a liquid cooling pipeline structure and an energy storage system. Background Art

[0002] Energy storage systems are essential foundational measures for microgrids, distributed power generation systems, and new energy vehicle fast-charging technologies. Their use in electronic systems improves grid stability and reliability, mitigating the impact of photovoltaic and wind power generation systems, which experience large transient fluctuations in wind speed. In the field of thermal management for power batteries and energy storage batteries, air cooling and liquid cooling are commonly used heat dissipation methods. Due to range requirements and limited size, power batteries are often deployed in high-density configurations. Traditional air cooling is no longer effective for controlling battery temperature, so liquid cooling is often used.

[0003] The liquid cooling pipeline structure commonly used in the prior art usually sets the liquid inlet pipe and the liquid return pipe at the bottom of the battery module, so that the bubbles in the pipeline cannot be effectively discharged, and the flow rate of the coolant in the pipeline is unstable, resulting in a large temperature difference in the battery module, affecting the life of the battery cells of the battery module. Utility Model Content

[0004] The present application provides a liquid cooling pipeline structure and an energy storage system, which can effectively discharge the gas accumulated in the coolant and ensure that the flow rate of the coolant in the pipeline structure remains uniform.

[0005] In order to solve the above technical problems, the present application provides a liquid cooling pipeline structure connected between the liquid inlet and the liquid outlet of the cooling device, and the liquid cooling pipeline structure includes:

[0006] a liquid inlet pipe, comprising a liquid inlet main pipe connected to the liquid outlet of the cooling device;

[0007] a liquid return pipe, comprising a liquid return main pipe connected to the liquid inlet of the cooling device;

[0008] The height of the liquid return pipe relative to the horizontal plane is higher than the height of the liquid inlet main pipe relative to the horizontal plane, and the pipe distance from the liquid inlet pipe to the liquid outlet of the cooling device is equal to the pipe distance from the liquid return pipe to the liquid inlet of the cooling device.

[0009] As a further improvement of the present application, the liquid inlet pipe further comprises a plurality of liquid inlet branch pipes connected to the liquid inlet main pipe, and the plurality of liquid inlet branch pipes are arranged on the liquid inlet main pipe along the length direction of the liquid inlet main pipe;

[0010] The liquid return pipe further comprises a plurality of liquid return branch pipes connected to the liquid return main pipe, and the plurality of liquid return branch pipes are arranged on the liquid return main pipe along the length direction of the liquid return main pipe.

[0011] As a further improvement of the present application, a plurality of liquid inlet branch pipes are vertically arranged at equal intervals on the liquid inlet main pipe, and an end portion of each liquid inlet branch pipe is extended in a direction close to the liquid return main pipe;

[0012] A plurality of liquid return branch pipes are arranged vertically on the liquid return main pipe at equal intervals, and an end portion of each liquid return branch pipe is extended in a direction close to the liquid inlet main pipe.

[0013] As a further improvement of the present application, the liquid inlet pipe further includes a plurality of liquid inlet branches connected to the liquid inlet branch pipe, and the plurality of liquid inlet branches are arranged on the liquid inlet branch pipe along the height direction of the liquid inlet branch pipe;

[0014] The liquid return pipe further comprises a plurality of liquid return branch pipes connected with the liquid return branch pipe, and the plurality of liquid return branch pipes are arranged on the liquid return branch pipe along the height direction of the liquid return branch pipe.

[0015] As a further improvement of the present application, a plurality of liquid inlet branch pipes are arranged at equal intervals on the liquid inlet branch pipe, and a plurality of liquid return branch pipes are arranged at equal intervals on the liquid return branch pipe;

[0016] The extending direction of the end portion of the liquid inlet branch pipe is opposite to the extending direction of the end portion of the liquid return branch pipe.

[0017] As a further improvement of the present application, the projections of several liquid inlet branches located on the same liquid inlet branch pipe in the vertical direction overlap with each other, and the projections of several liquid return branches located on the same liquid return branch pipe in the vertical direction overlap with each other.

[0018] As a further improvement of the present application, the inner diameters of the liquid inlet main pipe, the liquid inlet branch pipe and the liquid inlet branch pipe are gradually reduced;

[0019] The inner diameters of the liquid return main pipe, the liquid return branch pipe and the liquid return branch pipe gradually decrease.

[0020] As a further improvement of the present application, an exhaust valve is provided on the liquid return main pipe.

[0021] Based on the above-mentioned liquid cooling pipeline structure, the present application also provides an energy storage system, which includes the liquid cooling pipeline structure described in any of the above items, and the ends of the liquid inlet branch pipe and the liquid return branch pipe located on both sides of the same battery module extend in the direction close to the corresponding battery module and are connected to the cooling channel set in the corresponding battery module.

[0022] As a further improvement of the present application, the distance between two adjacent liquid inlet branch pipes and two adjacent liquid return branch pipes is greater than or equal to the length of the battery module, and the distance between two adjacent liquid inlet branch pipes and two adjacent liquid return branch pipes is greater than or equal to the height of the battery module.

[0023] Compared with the prior art, the liquid cooling pipeline structure and energy storage system provided in the embodiment of the present application, by setting the height of the liquid return main pipe relative to the horizontal plane to be higher than the height of the liquid inlet main pipe relative to the horizontal plane, enable the coolant to enter from the bottom and return from the top, thereby preventing the gas in the coolant from being effectively discharged and accumulating in the liquid cooling pipeline structure, thereby affecting the normal circulation of the coolant; setting the pipeline distance between the liquid inlet main pipe and the liquid outlet of the cooling device to be equal to the pipeline distance between the liquid return main pipe and the liquid inlet of the cooling device, thereby ensuring that the flow rate of the coolant in the pipeline structure is uniform and the pressure is equal, thereby avoiding the coolant flow rate being too fast or too slow, resulting in a large temperature difference in the battery module and affecting the battery cell life of the battery module, thereby ensuring the liquid cooling and heat dissipation effect of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 A schematic diagram of the structure of the liquid cooling pipeline structure provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1 An enlarged view of the details of point A in the liquid cooling pipe structure shown;

[0027] Figure 3 for Figure 1 An enlarged view of the details at point B in the liquid cooling pipe structure shown;

[0028] Figure 4 for Figure 1 An enlarged view of the details of point C in the liquid cooling pipe structure shown;

[0029] Description of reference numerals:

[0030] 10-liquid inlet pipe; 11-liquid inlet main pipe; 12-liquid inlet branch pipe; 13-liquid inlet branch pipe; 14-liquid inlet sub-branch pipe;

[0031] 20-liquid return pipe; 21-liquid return main pipe; 22-liquid return branch pipe; 23-liquid return branch pipe; 24-liquid return sub-branch pipe;

[0032] 30-cooling device; 31-liquid inlet; 32-liquid outlet; 33-quick plug interface;

[0033] 40-Battery module. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0035] In the description of this application, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement of the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0036] To provide a more detailed and complete description of the present disclosure, the following provides illustrative descriptions of the embodiments and examples of the present application; however, these descriptions are not intended to be the only ways to implement or use the embodiments of the present application. The embodiments cover features of various embodiments, as well as the method steps and sequences for constructing and operating these embodiments. However, other embodiments may also be used to achieve the same or equivalent functionality and step sequences.

[0037] Please refer to Figures 1-4 The embodiment of the present application provides a liquid cooling pipeline structure and energy storage system, which can effectively discharge the gas accumulated in the pipeline structure and ensure that the flow rate of the coolant in the pipeline structure remains uniform.

[0038] Please refer to Figure 1 , which is a structural schematic diagram of the liquid cooling pipeline structure provided in an embodiment of the present application. The liquid cooling pipeline structure is connected between the liquid inlet 31 and the liquid outlet 32 ​​of the cooling device 30, and specifically includes a liquid inlet pipe 10 and a liquid return pipe 20. By connecting the liquid inlet main pipe 11 in the liquid inlet pipe 10 with the liquid outlet 32 ​​of the cooling device 30, and connecting the liquid return main pipe 21 of the liquid return pipe 20 with the liquid inlet 31 of the cooling device 30, the coolant in the liquid return main pipe 21 enters the cooling device 30 through the liquid inlet 31 for cooling. After the cooling is completed, it flows from the liquid outlet 32 ​​of the cooling device 30 to the liquid inlet main pipe 11, thereby realizing the circulation of the coolant in the liquid return main pipe 21 and the liquid inlet main pipe 11.

[0039] In the embodiment of the present application, the liquid inlet pipe 10 includes a liquid inlet main pipe 11 connected to the liquid outlet 32 ​​of the above-mentioned cooling device 30, and the liquid return pipe 20 includes a liquid return main pipe 21 connected to the liquid inlet 31 of the above-mentioned cooling device 30, thereby forming a liquid cooling circuit consisting of the liquid return main pipe 21, the liquid inlet 31, the cooling device 30, the liquid outlet 32 ​​and the liquid inlet main pipe 11.

[0040] Preferably, the related art usually adopts the method of running pipes from below, setting the liquid inlet main pipe 11 and the liquid return main pipe 21 at the bottom of the battery module 40, or setting the liquid inlet main pipe 11 and the liquid return main pipe 21 at the same horizontal height, which makes it difficult to discharge the air in the coolant.

[0041] In the present application, the height of the liquid return pipe 21 relative to the horizontal plane is higher than the height of the liquid inlet pipe 11 relative to the horizontal plane. In other words, the liquid return pipe 21 is arranged above the liquid inlet pipe 11, which can effectively discharge the air in the coolant and avoid the problem of poor circulation of the coolant in the liquid inlet pipe 11 and the liquid return pipe 21.

[0042] Furthermore, in order to avoid the problem of uneven heat dissipation caused by the coolant flowing too fast or too slow, the related art usually sets a block in the liquid cooling pipeline structure to limit the flow, which increases the manufacturing cost. However, the present application document sets the pipe distance between the liquid inlet pipe 10 and the liquid outlet 32 ​​of the cooling device 30 to be equal to the pipe distance between the return pipe 20 and the liquid inlet 31 of the cooling device 30, ensuring that the coolant flowing inside the liquid inlet pipe 10 and the return pipe 20 has a uniform flow rate and equal pressure, and maintains a relatively stable flow speed between the liquid inlet pipe 10, the return pipe 20 and the cooling device 30, avoiding a large temperature difference in the battery module that affects the battery cell life of the battery module, thereby achieving liquid cooling heat dissipation.

[0043] As an optional implementation, please refer to Figure 2 ,for Figure 1 An enlarged view of the details of point A in the liquid cooling pipeline structure is shown. The liquid inlet pipe 10 provided in the present application includes a plurality of liquid inlet branch pipes 12 connected to the liquid inlet main pipe 11. The plurality of liquid inlet branch pipes 12 are arranged on the liquid inlet main pipe 11 along the length direction of the liquid inlet main pipe 11. The plurality of liquid inlet branch pipes 12 are connected to the liquid inlet main pipe 11, so as to allow the cooling liquid in the liquid inlet main pipe 11 to flow into the plurality of liquid inlet branch pipes 12.

[0044] Similarly, the liquid return pipe 20 includes a plurality of liquid return branch pipes 22 connected to the liquid return main pipe 21. The plurality of liquid return branch pipes 22 are arranged on the liquid return main pipe 21 along the length direction of the liquid return main pipe 21 to allow the coolant in the plurality of liquid return main pipes 21 to flow into the liquid return main pipe 21 and then into the cooling device 30 from the liquid return main pipe 21.

[0045] Furthermore, the liquid inlet pipe 10 provided in the present application also includes a plurality of liquid inlet branches 13 connected to the liquid inlet branch pipe 12, and the plurality of liquid inlet branches 13 are arranged on the liquid inlet branch pipe 12 along the height direction of the liquid inlet branch pipe 12. The liquid return pipe 20 also includes a plurality of liquid return branches 23 connected to the liquid return branch pipe 22, and the plurality of liquid return branches 23 are arranged on the liquid return branch pipe 22 along the height direction of the liquid return branch pipe 22.

[0046] In an optional application embodiment, the heat dissipation of the battery module 40 can be achieved through the liquid cooling pipeline structure provided in the present application. The battery module 40 is a battery module 40 with a cooling channel (not shown in the figure) arranged inside. At this time, the liquid inlet branch 13 and the liquid return branch 23 in the liquid cooling pipeline structure are connected to the cooling channel. The specific structure of the cooling channel is not further described in the present application.

[0047] When the battery module 40 is actually subjected to liquid cooling, the cooled coolant enters the plurality of liquid inlet branch pipes 12 through the liquid inlet main pipe 11, and then enters the liquid inlet branch pipe 13 through the liquid inlet branch pipe 12. Since the liquid inlet branch pipe 13 is connected to the cooling channel, the cooled coolant will enter the interior of the battery module 40 through the cooling channel to perform liquid cooling on the battery module 40. The cooled coolant enters the corresponding liquid return branch pipe 22 through the liquid return branch pipe 23, and then enters the liquid return main pipe 21 provided above through the liquid return branch pipe 22, and finally enters the cooling device 30 through the liquid inlet port 31 for cooling. The cooled coolant enters the liquid inlet main pipe 11 again through the liquid outlet port 32 to achieve circulating liquid cooling and heat dissipation.

[0048] As an optional implementation, in order to solve the problem of coolant space layout, please refer to Figure 3 ,for Figure 1 The enlarged view of the details at point B in the liquid cooling pipeline structure shown in the figure shows that the present application preferably arranges a plurality of liquid inlet branch pipes 12 vertically arranged at equal intervals on the liquid inlet main pipe 11, and arranges a plurality of liquid return branch pipes 22 vertically arranged at equal intervals on the liquid return main pipe 21. It can be observed that the end of each liquid inlet branch pipe 12 is extended in a direction close to the liquid return main pipe 21, and the end of each liquid return branch pipe 22 is extended in a direction close to the liquid inlet main pipe 11.

[0049] It can also be understood that when the liquid return main pipe 21 is arranged above the liquid inlet main pipe 11, the multiple liquid return branch pipes 22 arranged on the liquid return main pipe 21 are extended in a vertical downward direction, and the multiple liquid inlet branch pipes 12 arranged on the liquid inlet main pipe 11 are extended in a vertical upward direction, thereby achieving effective utilization of space.

[0050] Furthermore, it is preferred to arrange several liquid inlet branches 13 at equal intervals on the liquid inlet branch pipe 12, and to arrange several liquid return branches 23 at equal intervals on the liquid return branch pipe 22. It can be observed that the extension direction of the end of the liquid inlet branch pipe 13 is opposite to the extension direction of the end of the liquid return branch pipe 23, presenting a back-to-back structure.

[0051] As a further improvement of the present application, the projections of several liquid inlet branches 13 located on the same liquid inlet branch pipe 12 in the vertical direction overlap with each other, and the projections of several liquid return branches 23 located on the same liquid return branch pipe 22 in the vertical direction also overlap with each other.

[0052] That is to say, the liquid inlet branch pipes 13 and the liquid return branch pipes 23 are arranged in parallel and have the same structure. The liquid inlet branch pipes 13 and the liquid return branch pipes 23 should have a certain curvature so as to accommodate the battery module 40 inside the liquid cooling pipeline structure.

[0053] Optionally, the liquid inlet branch 13 and the liquid return branch 23 provided in the present application can be set in the form of plastic tubes, specifically in the form of pa12 (polylaurolactam, nylon 12) plastic tubes, which have good wear resistance and excellent low-temperature impact performance.

[0054] Of course, please refer to Figure 4 ,for Figure 1 In the enlarged view of the details at point C in the liquid cooling pipeline structure shown, the above-mentioned liquid inlet branch 13 and liquid return branch 23 can also include multiple liquid inlet sub-branches 14 and multiple liquid return sub-branches 24. It can also be understood that the above-mentioned liquid inlet branch 13 includes at least one liquid inlet sub-branch 14, and the liquid return branch 23 includes at least one liquid return sub-branch 24.

[0055] Specifically, several liquid inlet sub-branches 14 can be connected through the quick-insert interface 33, and several liquid return sub-branches 24 can also be connected through the quick-insert interface 33 to be used, so as to be adjusted according to the shape of battery modules 40 of different sizes.

[0056] by Figure 4 Taking the liquid inlet branch 13 on the middle left as an example, it can be observed that there is a certain distance between the liquid inlet branch 12 and the battery module 40. The length of a single liquid inlet sub-branch 14 cannot achieve the connection between the liquid inlet branch 12 and the cooling channel. Therefore, in this application embodiment, the liquid inlet branch 13 is provided with at least two liquid inlet sub-branches 14. This application connects one of the liquid inlet sub-branches 14 to the liquid inlet branch 12, connects the two liquid inlet sub-branches 14 through a quick-plug interface 33, and then connects the other liquid inlet sub-branch 14 to the cooling channel, thereby adjusting the length of the liquid inlet branch 13 to a length compatible with the battery module 40.

[0057] Similarly, the length of the liquid return branch pipe 23 can also be adjusted through the liquid return sub-branch pipe 24 and the quick-insert interface 33. For specific adjustment ideas, please refer to the description of the above-mentioned liquid inlet sub-branch pipe 14 and the liquid inlet branch pipe 13. This application will not go into details about this.

[0058] It should be noted that the present application does not impose further restrictions on the number of specific liquid inlet sub-branches 14 in the above-mentioned liquid inlet branch 13, nor does it impose further restrictions on the number of specific liquid return sub-branches 24 in the above-mentioned liquid return branch 23. The number of the above-mentioned liquid inlet sub-branches 14 and liquid return sub-branches 24 can be adjusted accordingly according to the size of the actual battery module 40; in principle, after adjustment, the pipeline distance between the liquid inlet pipe 10 and the liquid outlet 32 ​​of the cooling device 30 should be equal to the pipeline distance between the return pipe 20 and the liquid inlet 31 of the cooling device 30, which should be known to those skilled in the art.

[0059] Please continue to refer to Figure 1 Usually, several battery modules 40 are stacked for use. When liquid cooling of several battery modules 40 needs to be completed at the same time, the corresponding liquid inlet branch pipe 13 and liquid return branch pipe 23 on both sides of the battery module 40 can be connected to the cooling channel inside the battery module 40. It can be observed that the ends of the liquid inlet branch pipe 13 and the liquid return branch pipe 23 on both sides of the same battery module 40 extend in the direction close to the corresponding battery module 40, so as to facilitate communication with the cooling channel set in the corresponding battery module 40.

[0060] Furthermore, in order to facilitate the placement of the battery module 40 in the liquid cooling pipeline structure, it is necessary to ensure that the distance between two adjacent liquid inlet branch pipes 12 and two adjacent liquid return branch pipes 22 is greater than or equal to the length of the battery module 40, and the distance between two adjacent liquid inlet branch pipes 13 and two adjacent liquid return branch pipes 23 is greater than or equal to the length of the battery module 40.

[0061] Please refer to the preferred Figure 3 The liquid inlet branch pipe 12 and the liquid return branch pipe 22 can be arranged adjacent to each other in pairs, so that the liquid inlet branch pipe 13 and the liquid return branch pipe 23 provided on the liquid inlet branch pipe 12 and the liquid return branch pipe 22 are at the same horizontal height, thereby facilitating the connection of the liquid inlet branch pipe 13 and the liquid return branch pipe 23 with the cooling channel provided in the battery module 40, thereby realizing liquid cooling and heat dissipation of several stacked battery modules 40.

[0062] It can be understood that the pipe distance from the above-mentioned liquid inlet pipe 10 to the liquid outlet 32 ​​of the cooling device 30 is equal to the pipe distance from the return pipe 20 to the liquid inlet 31 of the cooling device 30 in order to ensure that the coolant flowing inside the liquid inlet pipe 10 and the return pipe 20 has a uniform flow rate and equal pressure, and effectively circulates between the liquid inlet pipe 10, the return pipe 20 and the cooling device 30 to achieve liquid cooling heat dissipation.

[0063] Therefore, when the liquid inlet pipe 10 is correspondingly provided with a liquid inlet main pipe 11, a liquid inlet branch pipe 12 and a liquid inlet branch pipe 13, and the liquid return pipe 20 is correspondingly provided with a liquid return main pipe 21, a liquid return branch pipe 22 and a liquid return branch pipe 23, it is also necessary to ensure that the pipeline distance between the liquid inlet branch pipe 13 and the liquid inlet branch pipe 12, from the liquid inlet branch pipe 12 to the liquid inlet main pipe 11 and then to the liquid outlet 32 ​​of the cooling device 30 is equal to the pipeline distance between the return liquid branch pipe 23 and the return liquid branch pipe 22, from the return liquid branch pipe 22 to the liquid return main pipe 21 and then to the liquid inlet 31 of the cooling device 30, as should be known to those skilled in the art.

[0064] As an optional embodiment, since the liquid inlet main pipe 11 contains the most coolant, the coolant in the liquid inlet main pipe 11 needs to enter the corresponding liquid inlet branch pipe 13 in sequence through the liquid inlet branch pipe 12. Therefore, the inner diameters of the liquid inlet main pipe 11, the liquid inlet branch pipe 12 and the liquid inlet branch pipe 13 can be set to gradually decrease.

[0065] Similarly, the inner diameters of the liquid return main pipe 21, the liquid return branch pipe 22 and the liquid return branch pipe 23 should be gradually reduced to prevent the coolant from being unable to circulate in the liquid cooling pipeline structure provided in this application and maintain a uniform flow rate.

[0066] As an optional embodiment, the present application further provides an exhaust valve (not shown in the figure) on the liquid return main pipe 21. By arranging the exhaust valve at a high position, the air in the pipeline structure can be removed to avoid cavitation inside the pipeline structure.

[0067] Furthermore, the liquid inlet pipe 12 and the liquid return pipe 22 can be placed close to each other to form a support between them. Figure 2 It can be observed that the end of the return liquid branch pipe 22 is flush with the liquid inlet branch pipe 13 set at the bottom of the liquid inlet branch pipe 12, or the end of the return liquid branch pipe 22 can be located between the liquid inlet branch pipe 13 set at the bottom of the liquid inlet branch pipe 12 and the liquid inlet main pipe 11, ensuring that the liquid inlet branch pipe 13 set at the bottom has a corresponding return liquid branch pipe 23 for use.

[0068] Based on the above-mentioned liquid cooling pipeline structure, the present application also provides an energy storage system, which includes a battery module 40 and the above-mentioned liquid cooling pipeline structure. Since a cooling channel is usually provided in the battery module 40, the present application connects the liquid inlet branch 13 and the liquid return branch 23 located on both sides of the same battery module 40 with the cooling channel provided in the corresponding battery module 40. It can be observed that the ends of the liquid inlet branch 13 and the liquid return branch 23 located on both sides of the same battery module 40 extend in a direction close to the corresponding battery module 40, which is convenient for connection with the cooling channel provided in the corresponding battery module 40.

[0069] Furthermore, the distance between two adjacent liquid inlet branch pipes 12 and two adjacent liquid return branch pipes 22 should be greater than or equal to the length of the battery module 40, and the distance between two adjacent liquid inlet branch pipes 13 and two adjacent liquid return branch pipes 23 should also be greater than or equal to the height of the battery module 40, so as to facilitate the placement of several battery modules 40 in the liquid cooling pipeline structure and realize heat dissipation of several battery modules 40.

[0070] Specifically, the cooling device 30 provided in the present application can be set as a chiller. The coolant cooled by the chiller enters the cooling channel of the corresponding battery module 40 through the liquid inlet main pipe 11, the liquid inlet branch pipe 12 and the liquid inlet branch pipe 13 in sequence, and then enters the chiller through the return liquid branch pipe 23, the return liquid branch pipe 22, the return liquid main pipe 21 and the liquid inlet 31 after completing the heat dissipation of the battery module 40. The chiller cools the coolant again and enters the liquid inlet main pipe 11 through the liquid outlet 32, and circulates in sequence to complete the liquid cooling heat dissipation of the battery module 40.

[0071] As an optional implementation, liquid cooling is usually required to be achieved through coolant, so a foam inhibitor can also be added to the coolant to avoid the impact of bubbles on the circulation of the coolant.

[0072] For other details on implementing the above technical solution in the above energy storage system, please refer to the description of the liquid cooling pipeline structure provided in the above application embodiment, which will not be repeated here.

[0073] The liquid cooling pipeline structure and energy storage system provided in the embodiments of the present application, by setting the height of the liquid return main pipe relative to the horizontal plane to be higher than the height of the liquid inlet main pipe relative to the horizontal plane, enable the coolant to enter from the bottom and return from the top, thereby preventing the gas in the coolant from being effectively discharged and accumulating in the liquid cooling pipeline structure, thereby affecting the normal circulation of the coolant; the pipeline distance between the liquid inlet pipe and the liquid outlet of the cooling device is set to be equal to the pipeline distance between the return main pipe and the liquid inlet of the cooling device, thereby ensuring that the flow rate of the coolant in the pipeline structure is uniform and the pressure is equal, thereby avoiding the coolant flow rate being too fast or too slow, resulting in a large temperature difference in the battery module and affecting the battery cell life of the battery module, thereby ensuring the liquid cooling and heat dissipation effect of the energy storage system.

[0074] It can be understood that the various technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above embodiments are merely exemplary embodiments for illustrating the principles of the present application, but the present application is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present application, and such modifications and improvements are also considered to be within the scope of protection of the present application.

Claims

1. A liquid cooling pipeline structure, connected between the liquid inlet and the liquid outlet of a cooling device, characterized in that: include: a liquid inlet pipe, comprising a liquid inlet main pipe connected to the liquid outlet of the cooling device; a liquid return pipe, comprising a liquid return main pipe connected to the liquid inlet of the cooling device; The height of the liquid return pipe relative to the horizontal plane is higher than the height of the liquid inlet pipe relative to the horizontal plane, and the pipe distance from the liquid inlet pipe to the liquid outlet of the cooling device is equal to the pipe distance from the liquid return pipe to the liquid inlet of the cooling device.

2. The liquid cooling pipeline structure according to claim 1, characterized in that: The liquid inlet pipe further comprises a plurality of liquid inlet branch pipes connected to the liquid inlet main pipe, wherein the plurality of liquid inlet branch pipes are arranged on the liquid inlet main pipe along the length direction of the liquid inlet main pipe; The liquid return pipe further comprises a plurality of liquid return branch pipes connected to the liquid return main pipe, and the plurality of liquid return branch pipes are arranged on the liquid return main pipe along the length direction of the liquid return main pipe.

3. The liquid cooling pipeline structure according to claim 2, characterized in that: A plurality of liquid inlet branch pipes are vertically arranged at equal intervals on the liquid inlet main pipe, and an end portion of each liquid inlet branch pipe is extended in a direction close to the liquid return main pipe; A plurality of liquid return branch pipes are arranged vertically on the liquid return main pipe at equal intervals, and an end portion of each liquid return branch pipe is extended in a direction close to the liquid inlet main pipe.

4. The liquid cooling pipeline structure according to claim 2, characterized in that: The liquid inlet pipe further comprises a plurality of liquid inlet branches connected to the liquid inlet branch pipe, wherein the plurality of liquid inlet branches are arranged on the liquid inlet branch pipe along the height direction of the liquid inlet branch pipe; The liquid return pipe further comprises a plurality of liquid return branch pipes connected with the liquid return branch pipe, and the plurality of liquid return branch pipes are arranged on the liquid return branch pipe along the height direction of the liquid return branch pipe.

5. The liquid cooling pipeline structure according to claim 4, characterized in that: A plurality of liquid inlet branch pipes are arranged at equal intervals on the liquid inlet branch pipe, and a plurality of liquid return branch pipes are arranged at equal intervals on the liquid return branch pipe; The extending direction of the end portion of the liquid inlet branch pipe is opposite to the extending direction of the end portion of the liquid return branch pipe.

6. The liquid cooling pipeline structure according to claim 5, characterized in that: The projections of the plurality of liquid inlet branches on the same liquid inlet branch pipe in the vertical direction overlap with each other, and the projections of the plurality of liquid return branches on the same liquid return branch pipe in the vertical direction overlap with each other.

7. The liquid cooling pipeline structure according to claim 4, characterized in that: The inner diameters of the liquid inlet main pipe, the liquid inlet branch pipe and the liquid inlet branch pipe gradually decrease; The inner diameters of the liquid return main pipe, the liquid return branch pipe and the liquid return branch pipe gradually decrease.

8. The liquid cooling pipeline structure according to claim 1, characterized in that: An exhaust valve is provided on the liquid return main pipe.

9. An energy storage system comprising a battery module and the liquid cooling pipeline structure according to any one of claims 4 to 7, characterized in that: The ends of the liquid inlet branch pipe and the liquid return branch pipe located on both sides of the same battery module extend in a direction close to the corresponding battery module and are connected to the cooling channel provided in the corresponding battery module.

10. The energy storage system according to claim 9, wherein: The distance between two adjacent liquid inlet branch pipes and two adjacent liquid return branch pipes is greater than or equal to the length of the battery module, and the distance between two adjacent liquid inlet branch pipes and two adjacent liquid return branch pipes is greater than or equal to the height of the battery module.

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