Liquid cooling pipe fittings, liquid cooling piping devices and energy storage systems

Abstract

This application relates to a liquid-cooled pipe connector, a liquid-cooled piping device, and an energy storage system. The liquid-cooled pipe connector includes: multiple first bridge pipe assemblies; a manifold, one end of each of the multiple first bridge pipe assemblies being connected to the manifold; a second bridge pipe assembly, one end of which is connected to the manifold; and a shut-off valve installed inside the second bridge pipe assembly. In this way, this solution only requires one shut-off valve installed on the second bridge pipe assembly, which can prevent coolant leakage inside the pipeline during maintenance shutdown. Compared with the prior art, the number of shut-off valves is significantly reduced, minimizing the impact on the pressure drop of the coolant flowing through the battery module, thus ensuring effective thermal management. Furthermore, reducing the number of shut-off valves further simplifies the structure of the liquid-cooled pipe connector, reducing usage and manufacturing costs.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a liquid-cooled pipe joint, a liquid-cooled pipeline device, and an energy storage system. Background Technology

[0002] With the development of energy storage technology, various energy storage systems are widely used in industries such as new energy vehicles and industrial production. Typically, an energy storage system includes battery modules, liquid cooling pipeline systems, and liquid cooling units. The battery modules are connected to the liquid cooling units through the liquid cooling pipeline systems, thereby enabling thermal management of the battery modules with the help of the liquid cooling units, ensuring the safe and reliable operation of the energy storage system.

[0003] However, currently, each battery module in the battery module is equipped with a liquid inlet branch pipe, and in order to prevent coolant leakage during maintenance, a shut-off valve is installed on each liquid inlet branch pipe. However, the simultaneous presence of multiple shut-off valves will affect the pressure drop of the coolant flowing in the battery module, resulting in poor thermal management and affecting the safe and reliable operation of the energy storage system. Summary of the Invention

[0004] Therefore, it is necessary to provide a liquid cooling pipe joint, liquid cooling pipeline device and energy storage system to address the problems affecting the cooling pressure drop and thermal management effect.

[0005] On one hand, this application provides a liquid cooling pipe connector, the liquid cooling pipe connector comprising:

[0006] Multiple first bridge takeover teams;

[0007] The manifold is connected to one end of each of the first bridge pipe assemblies.

[0008] A second bridge connector assembly, one end of which is connected to the manifold; and...

[0009] A shut-off valve is installed inside the second bridge pipe.

[0010] The liquid cooling pipe joint described above is used in applications connecting battery modules and liquid cooling units to achieve thermal management of the battery modules by the liquid cooling unit. Specifically, during installation, multiple first bridge pipe assemblies can be connected to the corresponding battery modules in the battery module. Multiple first and second bridge pipe assemblies are simultaneously integrated on the manifold. Therefore, only one shut-off valve needs to be installed on the second bridge pipe assembly to prevent coolant leakage during maintenance shutdowns. Compared to existing technologies, the number of shut-off valves is significantly reduced, minimizing the impact on the pressure drop of the coolant flowing through the battery modules and thus ensuring effective thermal management. Furthermore, reducing the number of shut-off valves further simplifies the structure of the liquid cooling pipe joint, reducing usage and manufacturing costs.

[0011] The technical solution of this application will be further described below:

[0012] In one embodiment, the first bridge pipe assembly includes a first bridge pipe body and a first connector. One end of the first bridge pipe body is connected to the manifold, and the other end of the first bridge pipe body is connected to the first connector. The first connector is used to connect to a correspondingly configured battery module.

[0013] In one embodiment, the second bridge pipe assembly includes a second bridge pipe body and a second connector. One end of the second bridge pipe body is connected to the manifold, and the other end of the second bridge pipe body is connected to the second connector. The second connector is used to connect directly or indirectly to the liquid cooling unit.

[0014] In one embodiment, the first connector and the second connector are quick-connect connectors.

[0015] In one embodiment, a plurality of first bridging pipe groups are arranged side by side at intervals along the length of the manifold, and a second bridging pipe group is used to connect two adjacent manifolds;

[0016] The internal flow channel of the manifold is divided into multiple branch channels, which are arranged along the length of the manifold. Each branch channel is connected to a corresponding first bridge pipe assembly. The diameter of the branch channel is smaller when it is closer to the second bridge pipe assembly, and larger when it is farther away from the second bridge pipe assembly.

[0017] In one embodiment, the second bridge tube body includes a first connecting part and a second connecting part. The first connecting part includes an inner wall surface and a locking tooth disposed on the inner wall surface. The end of the manifold connected to the first connecting part is provided with a locking groove, and the locking tooth is adapted to engage with the locking groove.

[0018] In one embodiment, the liquid cooling pipe joint further includes a plurality of throttling valves, each of which is disposed in a corresponding manner in the first bridge pipe assembly.

[0019] In one embodiment, the manifold includes multiple manifold segments and multiple return tees, and the three ports of each return tee are respectively sealed to two adjacent manifold segments and a first bridge pipe assembly.

[0020] The manifold segment and the first bridge pipe assembly are respectively rotatable relative to the return tee, and the second bridge pipe assembly is connected to one of the manifold segments.

[0021] In one embodiment, the manifold further includes two return two-way valves, which are respectively disposed at two ends of the manifold along its length. The two ports of the return two-way valves are respectively sealed and connected to an adjacent manifold segment and a first bridge pipe assembly.

[0022] The manifold section and the first bridge pipe assembly are respectively rotatable relative to the return pump two-way valve.

[0023] On the other hand, this application also provides a liquid cooling pipeline device, which includes the liquid cooling pipe joint as described above.

[0024] In addition, this application also provides an energy storage system, which includes:

[0025] Battery module;

[0026] The liquid cooling piping system as described above; and,

[0027] A liquid cooling unit is connected to the battery module through a liquid cooling pipeline device to achieve thermal management of the battery module. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the energy storage system according to an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the structure of a battery module according to one embodiment.

[0030] Figure 3 for Figure 1 Assembly structure diagram of the battery module and liquid cooling pipe connector.

[0031] Figure 4 for Figure 3 Side view structural diagram.

[0032] Figure 5 This is a schematic diagram of the structure of an inlet pipe connector according to one embodiment.

[0033] Figure 6 for Figure 5 Top view of the structure.

[0034] Figure 7 for Figure 6 Cross-sectional view of section AA.

[0035] Figure 8 for Figure 4 A magnified schematic diagram of the structure at point B in the middle.

[0036] Figure 9 for Figure 7 A magnified schematic diagram of the structure at point C.

[0037] Figure 10 This is a cross-sectional view of the internal flow channel structure of the manifold.

[0038] Figure 11 for Figure 10 A magnified schematic diagram of the structure at point D.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100. Energy storage system; 10. Energy storage cabinet; 20. Battery module; 21. Battery module; 211. Liquid cooling plate; 212. Battery cell; 213. Liquid inlet connector; 213a. Slot; 214. Liquid outlet connector; 30. Liquid cooling unit; 40. Liquid cooling pipe connector; 41. Liquid inlet pipe connector; 411. First bridge pipe assembly; 411a. First bridge pipe body; 411b. First connector; 4111b. Slot body; 412. Manifold; 412a. Manifold section; 412b. Return tee; 412c. Return tee; 412d. Branch channel; 413. Second bridge pipe assembly; 413a. Second bridge pipe body; 413b. Second connector; 414. Shut-off valve; 415. Throttling valve; 42. Liquid outlet connector. Detailed Implementation

[0041] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0042] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0047] See Figure 1 This application provides an energy storage system 100, which includes an energy storage cabinet 10, a battery module 20, a liquid cooling pipeline device, and a liquid cooling unit 30. The energy storage cabinet 10 is the main supporting structure of the energy storage system 100, used to house the battery module 20, the liquid cooling pipeline device, and the liquid cooling unit 30, thereby improving the integration level of the energy storage system 100.

[0048] Please continue reading. Figures 2 to 4 Specifically, the energy storage system 100 includes several battery modules 20, which are connected in series or in parallel to form a battery pack, thereby improving the energy storage capacity.

[0049] Each battery module 20 includes several battery modules 21, which are electrically connected in series. Each battery module 21 includes at least two battery cells 212 and a liquid cooling plate 211. The at least two battery cells 212 are arranged side by side on the liquid cooling plate 211. The liquid cooling plate 211 is also provided with an inlet connector 213 and an outlet connector 214 to facilitate the entry and exit of coolant.

[0050] Depending on the actual needs, the energy storage cabinet 10 can be a fixed structure or a movable structure. When a fixed structure is used, the bottom of the energy storage cabinet 10 can be equipped with fixed legs or other supporting components. When a movable structure is used, the bottom of the energy storage cabinet 10 can be equipped with rollers, tracks, or other moving parts. These can be flexibly selected according to specific actual needs.

[0051] The liquid cooling unit 30 is connected to the battery module 20 through a liquid cooling pipeline device to achieve thermal management of the battery module 20. Because the battery module 20 generates a lot of heat during long-term operation, in order to avoid the high-temperature environment from affecting the service life and reliability of the battery module 20, the liquid cooling unit 30 is required. By supplying circulating coolant (such as cooling water, cooling oil, etc.) to the battery module 20, the coolant exchanges heat with the battery module 20 to remove the heat, thereby achieving the effect of cooling and heat dissipation of the battery module 20.

[0052] The liquid cooling unit 30 has a liquid supply line and a liquid return line, and the liquid cooling line device includes a liquid cooling pipe joint 40.

[0053] For example, please continue reading Figure 3 and Figure 4 This application illustrates a liquid cooling pipe connector 40 in one embodiment, which consists of an inlet pipe connector 41 and an outlet pipe connector 42. During installation, the inlet pipe connector 41 connects the liquid delivery line to the inlet connectors 213 on all battery modules 21, and the outlet pipe connector 42 connects the return line to the outlet connectors 214 on all battery modules 21. This creates a circulating loop for coolant flow between the liquid cooling unit 30 and the battery modules 20, enabling the liquid cooling unit 30 to provide continuous and effective thermal management for the battery modules 20.

[0054] Please continue reading. Figures 5 to 7 To reduce manufacturing difficulty and cost, and at the same time improve the interchangeability of components, the inlet pipe connector 41 and the outlet pipe connector 42 adopt the same structural design, both of which include: multiple first bridge pipe groups 411, manifold 412, second bridge pipe groups 413 and shut-off valve 414.

[0055] One end of each first bridge connector assembly 411 is used to connect to the corresponding battery module 21. Specifically, the first bridge connector assembly 411 of the inlet connector 41 is connected to the inlet connector 213 of the battery module 21, and the first bridge connector assembly 411 of the outlet connector 42 is connected to the outlet connector 214 of the battery module 21. The other ends of the multiple first bridge connector assemblies 411 are all connected to the manifold 412; one end of the second bridge connector assembly 413 is connected to the manifold 412; and a shut-off valve 414 is installed inside the second bridge connector.

[0056] In summary, implementing the technical solution of this embodiment will have the following beneficial effects: the liquid cooling pipe joint 40 of the above solution is used in the case of connecting the battery module 20 and the liquid cooling unit 30, so as to realize the thermal management of the battery module 20 by the liquid cooling unit 30. Specifically, during installation, multiple first bridge pipe assemblies 411 can be connected to the corresponding battery modules 21 in the battery module 20, and multiple first bridge pipe assemblies 411 and second bridge pipe assemblies 413 are simultaneously installed and integrated on the manifold 412. Therefore, only one shut-off valve 414 needs to be installed on the second bridge pipe assembly 413 to prevent coolant leakage inside the pipeline when the system is shut down for maintenance. Compared with the prior art, the number of shut-off valves 414 is significantly reduced. The so-called pressure drop refers to the pressure reduction caused by energy loss when the fluid flows in the pipe. The greater the pressure drop, the more it affects the circulating liquid cooling of the liquid-cooled unit. The solution adopted in this application, which reduces the number of shut-off valves, has a smaller impact on the pressure drop of the coolant flowing through the battery module 20, thereby ensuring the thermal management effect. In addition, reducing the number of shut-off valves 414 can further simplify the structure of the liquid cooling pipe joint 40 and reduce the cost of use and manufacturing.

[0057] In some embodiments, the first bridge pipe assembly 411 includes a first bridge pipe body 411a and a first connector 411b. One end of the first bridge pipe body 411a is connected to the manifold 412, and the other end of the first bridge pipe body 411a is connected to the first connector 411b. The first connector 411b is used to connect to the correspondingly configured battery module 21. Therefore, the first connector 411b can be quickly and effectively connected to the inlet connector 213 and outlet connector 214 on the battery module 21, so as to facilitate the flow of coolant by connecting the first bridge pipe body 411a to the battery module 21.

[0058] In other embodiments, the second bridge pipe assembly 413 includes a second bridge pipe body 413a and a second connector 413b. One end of the second bridge pipe body 413a is connected to the manifold 412, and the other end is connected to the second connector 413b. The second connector 413b is used to connect directly or indirectly to the liquid cooling unit 30. Therefore, the second connector 413b can be quickly and effectively connected to the liquid cooling unit 30 to enable the coolant to circulate between the second bridge pipe body 413a and the liquid cooling unit 30.

[0059] Depending on actual needs, the second bridge pipe body 413a and the second connector 413b can be an integral structure or a detachable assembly structure. Similarly, the second bridge pipe body 413a and the liquid cooling unit 30 can be an integral structure or a detachable assembly structure. Furthermore, the second bridge pipe body 413a has an L-shaped structure to reduce space occupation and improve installability.

[0060] In practical applications, frequent insertion and removal of the liquid cooling pipe connector 40 is often required. This can easily lead to wear and tear on the first connector 411b and / or the second connector 413b, necessitating replacement. Traditional liquid cooling piping systems are mostly one-piece structures, meaning that when the first connector 411b and / or the second connector 413b wears, the entire liquid cooling piping system needs to be replaced, resulting in increased costs and wasted resources. To address this, in some embodiments of this application, the first connector 411b and the second connector 413b utilize quick-connect fittings. This allows for easy individual removal and replacement of damaged liquid cooling pipe connectors 40, achieving the effect of replacing only locally worn components of the liquid cooling piping system, thus effectively solving the aforementioned problems.

[0061] Optionally, the quick-connector can be any of the following types: snap-on quick-connector, magnetic quick-connector, etc., and the specific type can be selected according to actual needs.

[0062] like Figure 8As shown, for example, taking the quick-connect structure of the first connector 411b and the liquid inlet connector 213 on the battery module 21 as an example, a retaining body 4111b protrudes from the inner wall of the first connector 411b, and a retaining groove 213a corresponding to the retaining body 4111b is recessed on the outer wall of the liquid inlet connector 213. When the liquid inlet connector 213 is inserted into the first connector 411b, the retaining body 4111b and the retaining groove 213a are snapped together, thereby achieving quick and convenient assembly of the first connector 411b and the liquid inlet connector 213, and providing good sealing performance. Of course, the retaining groove can also be recessed on the inner wall of the first connector 411b, and the retaining body can be protruding on the outer wall of the liquid inlet connector 213. The connection method between the second connector 413b and the liquid cooling unit 30 is the same as the above structure, so it will not be described in detail here.

[0063] like Figure 5 As shown, in addition, based on any of the above embodiments, a plurality of first bridging pipe groups 411 are arranged side by side at intervals along the length of the manifold 412, and a second bridging pipe group 413 is connected to the middle or near the middle of the manifold 412. For example, in this embodiment, the second bridging pipe group 413 is connected to the manifold 412 near the middle.

[0064] Furthermore, the second bridge connector group 413 is also used to connect two adjacent manifolds 412. It should be noted that in this embodiment, there is a certain configuration relationship between the number of manifolds 412, the second bridge connector group 413 and the number of battery modules 20. For example, when two rows of battery modules 20 are set side by side, two manifolds 412 and one second bridge connector group 413 need to be set at the same time. The second bridge connector group 413 is connected to two adjacent manifolds 412, and the manifolds 412 are connected to the battery modules 20 one by one. When four rows of battery modules 20 are set side by side, four manifolds 412 and two second bridge connector groups 413 need to be set at the same time. Each second bridge connector group 413 is connected to two manifolds 412, all manifolds 412 are connected in sequence, and the manifolds 412 are connected to the battery modules 20 one by one, and so on.

[0065] like Figure 10 and Figure 11 As shown, the internal flow channel of the manifold 412 is divided into multiple branch flow channels 412d, which are arranged along the length of the manifold 412. Each branch flow channel 412d is connected to a corresponding first bridge pipe group 411. The branch flow channel 412d closer to the second bridge pipe group 413 has a smaller diameter, and the branch flow channel 412d farther away from the second bridge pipe group 413 has a larger diameter.

[0066] By adopting a branch flow channel 412d design with multiple variable diameter structures, the coolant flow rate into the battery module 21 connected to the branch flow channel 412d near the second bridge pipe body 413a is slow, while the coolant flow rate into the battery module 21 connected to the branch flow channel 412d far from the second bridge pipe body 413a is fast. This achieves a more consistent control of the timing of coolant reception in all battery modules 21, thereby ensuring good uniformity of coolant flow in each battery module 21, reducing the temperature difference between different battery modules 21, and improving the cycle life and thermal management efficiency of the battery module 20.

[0067] like Figure 7 and Figure 9 As shown, or as an alternative to the above embodiment, the liquid cooling pipe connector 40 further includes multiple throttle valves 415, each corresponding to a different throttle valve in the first bridge pipe assembly 411. By controlling the opening and closing time and opening degree of each throttle valve 415, the timing of the coolant reaching each branch flow channel 412d can be made more consistent, resulting in a uniform flow rate of coolant into each battery module 21, reducing temperature differences, and improving heat dissipation and cooling effect.

[0068] Please continue reading. Figure 5 In some embodiments, the manifold 412 includes multiple manifold segments 412a and multiple return tees 412b. Each return tee 412b has three ports that are respectively sealed to two adjacent manifold segments 412a and a first bridge pipe assembly 411. By using different numbers of manifold segments 412a and return tees 412b, manifolds 412 of different lengths can be obtained and adapted to different numbers of first bridge pipe assemblies 411, thereby meeting the installation requirements of different numbers of battery modules 21 and improving the applicability of the liquid cooling pipe connector 40. Furthermore, the assembly method of interlocking the manifold segments 412a, return tees 412b, and first bridge pipe assemblies 411 is simple and the connection is safe and reliable.

[0069] Furthermore, the manifold 412 also includes two return tee ports 412c, which are respectively disposed at two ends along the length of the manifold 412. The two ports of the return tee ports 412c are respectively sealed to an adjacent manifold segment 412a and a first bridge pipe assembly 411. The return tee ports 412c disposed at both ends of the manifold 412 not only achieve end sealing of the manifold 412, but also enable communication between the two first bridge pipe assemblies 411 located at the two closest ends of the manifold 412 and the manifold 412.

[0070] The manifold segment 412a and the first bridge connector assembly 411 are respectively rotatable relative to the return tee 412b, and the second bridge connector assembly 413 is connected to one of the manifold segments 412a. The manifold segment 412a and the first bridge connector assembly 411 are respectively rotatable relative to the return tee. In this way, the second bridge connector assembly 413 can rotate up and down with the manifold segment 412a that it is adapted to assemble, thus forming different angle arrangements, which facilitates obstacle avoidance under different installation conditions and connection with infusion and return pipelines. The return tee 412b and the return tee 412c can rotate relative to the manifold segment 412a and the first bridge connector assembly 411, which can eliminate the influence of installation size errors and deformation, and ensure that each component is assembled smoothly and normally.

[0071] It should be noted that the return tee 412b connected to the second bridge pipe assembly 413 is essentially a confluence section. In order to ensure the flow rate of coolant in this confluence section and thus ensure liquid cooling efficiency, when all return tees 412b and return dices 412c have the same size, the valve port width of the throttle valve 415 installed in the return tee 412b connected to the second bridge pipe assembly 413 should be greater than the valve port width of the throttle valve 415 installed in the return tee 412b or return dice 412c connected to the first bridge pipe assembly 411.

[0072] Alternatively, when the valve port width of the throttle valve 415 installed in the return tee 412b connected to the second bridge pipe assembly 413 is the same as the valve port width of the throttle valve 415 installed in the return tee 412b or return two-way valve 412c connected to the first bridge pipe assembly 411, then it is necessary to ensure that the size of the return tee 412b connected to the second bridge pipe assembly 413 is larger than the size of the return tee 412b or return two-way valve 412c connected to the first bridge pipe assembly 411.

[0073] Furthermore, the second bridge pipe body 413a includes a first connecting part and a second connecting part. The first connecting part includes an inner wall surface and locking teeth disposed on the inner wall surface. The end of the manifold 412 connected to the first connecting part is provided with a locking groove, and the locking teeth and locking groove are adapted to engage. By adopting the locking and locking groove engagement method, the second bridge pipe body 413a and the manifold 412 can be quickly inserted and assembled. The connection method is simple, and the sealing performance and reliability are good.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A liquid-cooled tube fitting, characterized by, The liquid cooling pipe joint comprises: a plurality of first bridge pipe groups; a liquid collecting pipe, one end of each of the plurality of first bridge pipe groups being connected to the liquid collecting pipe; a second bridge pipe group, one end of the second bridge pipe group being connected to the liquid collecting pipe; and a stop valve, the stop valve being arranged in the second bridge pipe group; the plurality of first bridge pipe groups being arranged in parallel and spaced apart in the length direction of the liquid collecting pipe, the second bridge pipe group being used to connect two adjacent liquid collecting pipes; an internal flow channel of the liquid collecting pipe being divided into a plurality of branch flow channels, the plurality of branch flow channels being arranged along the length direction of the liquid collecting pipe, each of the branch flow channels being connected to a corresponding one of the first bridge pipe groups; wherein the branch flow channels closer to the second bridge pipe group have smaller diameters, and the branch flow channels farther from the second bridge pipe group have larger diameters.

2. The liquid-cooled tube fitting of claim 1, wherein, The first bridge pipe group comprises a first bridge pipe body and a first joint, one end of the first bridge pipe body being connected to the liquid collecting pipe, and the other end of the first bridge pipe body being connected to the first joint.

3. The liquid-cooled tube fitting of claim 2, wherein, The second bridge pipe group comprises a second bridge pipe body and a second joint, one end of the second bridge pipe body being connected to the liquid collecting pipe, and the other end of the second bridge pipe body being connected to the second joint.

4. The liquid-cooled tube fitting of claim 3, wherein, The first joint and the second joint are quick plug joints.

5. The liquid-cooled tube fitting of claim 3, wherein, The second bridge pipe body comprises a first connecting portion and a second connecting portion, the first connecting portion comprising an inner wall surface and a clamping tooth arranged on the inner wall surface, an end portion of the liquid collecting pipe connected to the first connecting portion being provided with a clamping groove, and the clamping tooth and the clamping groove being adapted for clamping connection.

6. The liquid-cooled tube fitting of claim 1, wherein, The liquid cooling pipe joint further comprises a plurality of throttling valves, the throttling valves being arranged one by one in the first bridge pipe groups.

7. The liquid-cooled tube fitting of claim 1, wherein, The liquid collecting pipe comprises a plurality of liquid collecting pipe segments and a plurality of backflow tees, three interfaces of each of the backflow tees being respectively and sealingly connected to two adjacent liquid collecting pipe segments and one first bridge pipe group; wherein the liquid collecting pipe segments and the first bridge pipe groups are relatively rotatable with the backflow tees, and the second bridge pipe group is connected to one of the liquid collecting pipe segments.

8. The liquid-cooled tube fitting of claim 7, wherein, The liquid collecting pipe further comprises two backflow tees, the two backflow tees being arranged at two end portions in the length direction of the liquid collecting pipe, two interfaces of each of the backflow tees being respectively and sealingly connected to one of the liquid collecting pipe segments and one of the first bridge pipe groups; wherein the liquid collecting pipe segments and the first bridge pipe groups are relatively rotatable with the backflow tees.

9. A liquid-cooled tubing arrangement, characterized by The liquid cooling pipe joint comprises:

10. An energy storage system characterized by, a battery module; the liquid cooling pipe device according to claim 9; and a liquid cooling unit, the liquid cooling unit being connected to the battery module through the liquid cooling pipe device to achieve thermal management of the battery module. ​ ​

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