A multi-way connector and battery liquid cooling system

Abstract

The application discloses a multi-way joint and a battery liquid cooling system, and belongs to the technical field of power batteries. The multi-way joint comprises a backwater main pipeline joint, an exhaust pipeline joint and at least two backwater branch pipeline joints. An exhaust port is arranged at the highest point of the outer wall surface of the backwater main pipeline joint, and the exhaust pipeline joint is connected at the exhaust port. One of the backwater branch pipeline joints is coaxially connected at the end of the backwater main pipeline joint, and the rest of the backwater branch pipeline joints are connected on the outer wall surface of the backwater main pipeline joint. The multi-way joint can integrate at least four pipelines together, greatly improves the integration of the pipeline system of the battery liquid cooling system, reduces the connection points, and reduces the risk of liquid leakage. Moreover, the multi-way joint sets the exhaust port at the highest point of the outer wall surface of the backwater main pipeline joint, so that the exhaust pipeline is connected at a high position through the exhaust pipeline joint, thereby improving the convenience of air exhaust and avoiding the phenomenon that air is brought into the water pump by the water flow.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a multi-way joint and a battery liquid cooling system. BACKGROUND

[0002] With the sharp reduction of traditional energy and the increasingly serious environmental situation, power batteries as clean energy are gradually popularized and widely used in various fields. With the popularization and application of power battery systems including multiple battery packs in heavy trucks, mine trucks and engineering machinery, etc. Heavy vehicles, the battery liquid cooling system used with the battery pack has also gradually attracted people's attention. The battery liquid cooling system mainly exchanges heat between low-temperature cooling liquid and high-temperature battery pack, thereby taking away the heat generated by the battery pack, so that the working temperature of the battery pack does not become too high, and adjusts the temperature difference of the power battery to ensure the working life of the power battery.

[0003] The existing battery liquid cooling system mainly consists of a liquid cooling unit, an expansion tank, a pipeline, a joint, a clamp and a liquid cooling plate (usually integrated in the battery pack) and other components. The joint is an important part of the battery liquid cooling system, and the multi-way joint plays a key role in reducing leakage points, controlling flow distribution and pipeline exhaust.

[0004] However, the multi-way joint design in the existing battery liquid cooling system has the following problems or deficiencies:

[0005] 1. The unreasonable design of the existing multi-way joint leads to poor exhaust effect when the battery liquid cooling system is filled and operated, and air enters the water pump to cause cavitation, which has a great impact on the service life of the water pump.

[0006] 2. The existing multi-way joint is mostly a three-way joint, and since there are many pipelines in the battery liquid cooling system, the number of connection points is large, and the risk of liquid leakage is high.

[0007] Therefore, how to propose a multi-way joint that can improve the exhaust effect of the waterway, effectively reduce the number of connection points in the battery liquid cooling system, and reduce the risk of liquid leakage is a technical problem that needs to be solved at present. SUMMARY

[0008] The first object of the present application is to provide a multi-way joint, which can connect more than three pipelines, effectively reduce the number of connection points, reduce the risk of liquid leakage, and facilitate air flow and good exhaust effect.

[0009] To achieve this purpose, the present application adopts the following technical solutions:

[0010] A multi-way joint comprises: a return water main pipe joint, one end of which is used for connecting a return water main pipe, the return water main pipe joint is provided with a first channel through the axial direction, and a gas exhaust port in communication with the first channel is arranged at the highest point of the outer wall surface of the return water main pipe joint; an exhaust pipe joint, one end of which is used for connecting an exhaust pipe, and the other end is connected at the gas exhaust port, the exhaust pipe joint is provided with a second channel through the axial direction, and the second channel is in communication with the first channel through the gas exhaust port; and at least two return water branch pipe joints, one end of one of the return water branch pipe joints is connected at the other end of the return water main pipe joint, and the other ends of the remaining return water branch pipe joints are connected at the outer wall surface of the return water main pipe joint, the other end of each of the return water branch pipe joints is used for connecting a return water branch pipe, and each of the return water branch pipe joints is provided with a third channel through the axial direction, and the third channel is in communication with the first channel.

[0011] Preferably, the return water main pipe joint is in the shape of a circular tube, the diameter of the return water main pipe joint is greater than the diameter of the return water branch pipe joint, and the exhaust pipe joint is vertically connected above the return water main pipe joint.

[0012] Preferably, the return water main pipe joint is in the shape of a stepped tube, the return water main pipe joint comprises a first main pipe joint and a second main pipe joint which are coaxially connected, the diameter of the first main pipe joint is greater than the diameter of the second main pipe joint and the diameter of the return water branch pipe joint, and the exhaust pipe joint is vertically connected above the first main pipe joint.

[0013] Preferably, one end of the second main pipe joint away from the first main pipe joint is used for connecting the return water main pipe, and at least two return water branch pipe joints are connected on the first main pipe joint.

[0014] Preferably, the number of the return water branch pipe joints is two, which are a first return water branch pipe joint and a second return water branch pipe joint, the first return water branch pipe joint is coaxially connected at one end of the first main pipe joint away from the second main pipe joint, and the second return water branch pipe joint is connected below the first main pipe joint.

[0015] Preferably, the number of the return water branch pipe joints is three, which comprise a first return water branch pipe joint, a second return water branch pipe joint and a third return water branch pipe joint, the first return water branch pipe joint is coaxially connected at one end of the first main pipe joint away from the second main pipe joint, and the second return water branch pipe joint and the third return water branch pipe joint are both connected below the first main pipe joint.

[0016] Preferably, the second return water branch pipe joint and the third return water branch pipe joint are arranged in a staggered manner with the exhaust pipe joint, and the exhaust pipe joint is arranged close to the second main pipe joint relative to the second return water branch pipe joint and the third return water branch pipe joint.

[0017] Preferably, the second main pipe joint comprises a first joint and a second joint connected in a T shape, one end of the second joint is connected to the middle of the first joint, and the other end is used for connecting one return water main pipe, one end of the first joint is coaxially connected to the first main pipe joint, and the other end is used for connecting another return water main pipe.

[0018] Preferably, a stop valve is arranged on the part of the first joint between the second joint and the first main pipe joint.

[0019] The second object of the present application is to provide a battery liquid cooling system with good exhaust effect and low risk of liquid leakage.

[0020] To achieve this object, the present application adopts the following technical solutions:

[0021] A battery liquid cooling system comprises the above-mentioned multi-way joint.

[0022] The present application has the following beneficial effects:

[0023] The present application provides a multi-way joint, which comprises a return water main pipe joint, an exhaust pipe joint and at least two return water branch pipe joints, one end of the return water main pipe joint is used for connecting a return water main pipe, the return water main pipe joint is provided with a first channel penetrating in the axial direction, an exhaust port communicating with the first channel is arranged at the highest point of the outer wall surface of the return water main pipe joint, one end of the exhaust pipe joint is used for connecting an exhaust pipe, and the other end is connected at the exhaust port, the exhaust pipe joint is provided with a second channel penetrating in the axial direction, the second channel communicates with the first channel through the exhaust port, one end of one of the return water branch pipe joints is connected to the other end of the return water main pipe joint, and one end of the rest of the return water branch pipe joints is connected to the outer wall surface of the return water main pipe joint, the other end of each return water branch pipe joint is used for connecting a return water branch pipe, and each return water branch pipe joint is provided with a third channel penetrating in the axial direction and communicating with the first channel. The multi-way joint integrates at least four pipe joints together, thereby integrating at least four pipes together, greatly improving the integration degree of the pipes, reducing the number of connection points, and reducing the risk of liquid leakage. By arranging the exhaust port at the highest point of the outer wall surface of the return water main pipe joint, the exhaust pipe is connected to a high position through the exhaust pipe joint, thereby improving the convenience of air exhaust and avoiding the phenomenon of air being carried into the water pump by the water flow. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Figure 1 is a structural schematic diagram of a multi-way connector provided by an embodiment of the present application;

[0025] Figure 2 Figure 2 is a structural schematic diagram of a multi-way connector provided by another embodiment of the present application;

[0026] Figure 3 Figure 3 is a structural schematic diagram of a multi-way connector provided by a further embodiment of the present application;

[0027] Figure 4 Figure 4 is a structural schematic diagram of a battery liquid cooling system provided by the present application;

[0028] Figure 5 Figure 5 is another structural schematic diagram of a battery liquid cooling system provided by the present application.

[0029] In the drawings:

[0030] 100, multi-way connector;

[0031] 110, water return main pipe connector; 111, first main pipe connector; 112, second main pipe connector; 1121, first connector; 1122, second connector;

[0032] 120, exhaust pipe connector; 130, first water return branch pipe connector; 140, second water return branch pipe connector; 150, third water return branch pipe connector; 160, stop valve;

[0033] 200, battery pack; 300, expansion tank; 400, flow pipe. DETAILED DESCRIPTION

[0034] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0036] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or 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.

[0037] The embodiment provides a multi-way joint 100, as shown in the figure, which can connect multiple pipelines and be used in a battery liquid cooling system to realize the communication and integration of multiple pipelines in the battery liquid cooling system, so as to form a pipeline system of the battery liquid cooling system. Of course, in addition to the battery liquid cooling system, the multi-way joint 100 provided by the embodiment can also be used in other devices or systems that need to use pipeline joints. Figures 1 to 3

[0038] Specifically, the multi-way joint 100 provided by the embodiment includes a backwater main pipeline joint 110, an exhaust pipeline joint 120 and at least two backwater branch pipeline joints. Wherein, the backwater main pipeline joint 110, the exhaust pipeline joint 120 and the backwater branch pipeline joint are all tubular structures, each pipeline joint includes an annular inner wall surface and an annular outer wall surface, and the inner wall surface is surrounded to form a channel allowing water and air to pass through. One end of the backwater main pipeline joint 110 is used to connect the backwater main pipeline, and the other end is used to connect one of the backwater branch pipeline joints. Optionally, the backwater main pipeline joint 110 and the backwater branch pipeline joint are coaxially arranged and connected by welding. The backwater main pipeline joint 110 is provided with a first channel penetrating along the axial direction thereof, and the first channel is the space surrounded by the inner wall surface of the backwater main pipeline joint 110. The highest point of the outer wall surface of the backwater main pipeline joint 110 is provided with an exhaust port in communication with the first channel. It should be noted that the highest point here refers to the place farthest from the center axis of the backwater main pipeline joint 110 on the outer wall surface of the backwater main pipeline joint 110, and in addition, when the multi-way joint 100 is installed in the pipeline system of the battery liquid cooling system, the installation angle of the multi-way joint 100 also needs to ensure that the highest point of the outer wall surface of the backwater main pipeline joint 110 is at the relatively highest position of the entire backwater main pipeline joint 110 from the bottom surface of the equipment. Optionally, the shape of the exhaust port is determined according to the cross-sectional shape of the backwater branch pipeline joint, which can be circular, directional or other shapes.

[0039] ​One end of the exhaust pipeline joint 120 is used to connect the exhaust pipeline, and the other end is connected at the exhaust port. The exhaust pipeline joint 120 is provided with a second channel in the axial direction, and the second channel is communicated with the first channel through the exhaust port. In addition to the water return branch pipeline joint coaxially connected with the water return main pipeline joint 110, the other ends of the remaining water return branch pipeline joints are connected to the outer wall surface of the water return main pipeline joint 110. The other end of each water return branch pipeline joint away from the water return main pipeline joint 110 can be connected to a water return branch pipeline, respectively. Each water return branch pipeline joint is provided with a third channel in the axial direction, and the third channel is communicated with the first channel.

[0040] Since the multi-way joint 100 integrates the water return main pipeline joint 110, the exhaust pipeline joint 120, and at least two water return branch pipeline joints, at least four pipeline joints are integrated by using the multi-way joint 100. Compared with the three-way joint in the prior art, the multi-way joint 100 provided in the embodiment is at least a four-way joint, which can greatly improve the integration degree of the pipeline system and reduce the number of connection points, thereby facilitating the reduction of the risk of liquid leakage. Moreover, by arranging the exhaust port at the highest point of the outer wall surface of the water return main pipeline joint 110 and connecting the exhaust pipeline to the exhaust port through the exhaust pipeline joint 120, the exhaust pipeline can be arranged at a relatively high position. Considering the density of air, such an arrangement can improve the convenience of air exhaust from the multi-way joint 100 and the pipeline system, and avoid the phenomenon that air is brought into the water pump of the pipeline system by the water flow.

[0041] It should be noted that the connection mode of the above-mentioned pipeline joints and pipelines is not limited to the clamp connection, and the quick plug connection and the expansion connection are also feasible, as long as stable connection can be achieved. The materials of the above-mentioned pipeline joints and pipelines are not limited to stainless steel, and aluminum and nylon materials can also be used.

[0042] In some embodiments, as shown in Figure 1 the water return main pipeline joint 110 is in a circular tube shape, and the diameter of the water return main pipeline joint 110 is greater than that of the water return branch pipeline joint. The exhaust port is arranged at the upper portion of the water return main pipeline joint 110, and the exhaust pipeline joint 120 is vertically connected above the water return main pipeline joint 110 through the exhaust port. Since the diameter of the water return main pipeline joint 110 is greater than that of the water return branch pipeline joint, the water return main pipeline joint 110 is arranged at a higher position than the water return branch pipeline joint. The exhaust port is arranged at the upper portion of the water return main pipeline joint 110, so that the exhaust pipeline joint 120 and the exhaust pipeline connected to the exhaust pipeline joint 120 are arranged at a relatively high position, thereby facilitating air exhaust and prolonging the service life of the water pump.

[0043] In some embodiments, as shown in Figure 2As shown, the return main pipe joint 110 is in a stepped tubular shape. Specifically, the return main pipe joint 110 includes a coaxially connected first main pipe joint 111 and a second main pipe joint 112, both of which are in a circular tubular shape, and the diameter of the first main pipe joint 111 is greater than that of the second main pipe joint 112 and is greater than that of the return branch pipe joints. The vent is provided on the first main pipe joint 111, and the exhaust pipe joint 120 is vertically connected above the first main pipe joint 111 through the vent. The end of the second main pipe joint 112 away from the first main pipe joint 111 is used to connect the return main pipe, and one of the return branch pipe joints is coaxially connected to the end of the first main pipe joint 111 away from the second main pipe joint 112, and the remaining return branch pipe joints are all connected to the outer wall surface of the first main pipe joint 111.

[0044] By setting the return main pipe joint 110 in a stepped tubular shape and setting the vent on the first main pipe joint 111 with a larger size, the exhaust pipe joint 120 and the exhaust pipe connected to the vent are at the relatively highest point, which facilitates air exhaust and helps to prolong the service life of the water pump.

[0045] In some embodiments, continuing to refer to the multi-way joint 100 as shown in Figure 1 and Figure 2 As shown, the number of return branch pipe joints can be two. The two return branch pipe joints are a first return branch pipe joint 130 and a second return branch pipe joint 140, the first return branch pipe joint 130 is coaxially connected to the end of the first main pipe joint 111 away from the second main pipe joint 112, and the second return branch pipe joint 140 is connected below the first main pipe joint 111. In this way, the multi-way joint 100 described above forms a four-way joint, which simultaneously realizes the connection and integration of four pipes, has high integration degree, and can reduce the risk of connection points and liquid leakage.

[0046] In some embodiments, as shown in Figure 3 The number of return branch pipe joints is three, and the three return branch pipe joints include a first return branch pipe joint 130, a second return branch pipe joint 140, and a third return branch pipe joint 150, the first return branch pipe joint 130 is coaxially connected to the end of the first main pipe joint 111 away from the second main pipe joint 112, and the second return branch pipe joint 140 and the third return branch pipe joint 150 are both connected below the first main pipe joint 111. Optionally, the second return branch pipe joint 140 and the third return branch pipe joint 150 are disposed in a staggered manner with the exhaust pipe joint 120, and the exhaust pipe joint 120 is disposed closer to the second main pipe joint 112 relative to the second return branch pipe joint 140 and the third return branch pipe joint 150.

[0047] Furthermore, continue to refer to Figure 3 As shown, the second main pipeline connector 112 also includes a first connector 1121 and a second connector 1122 connected in a T-shape. One end of the second connector 1122 is connected to the middle of the first connector 1121, and the other end is used to connect to a return water main pipeline. One end of the first connector 1121 is coaxially connected to the first main pipeline connector 111, and the other end is used to connect to another return water main pipeline. This allows the aforementioned multi-way connector 100 to form a six-way connector, simultaneously achieving the connection and integration of six pipelines. This higher integration level further reduces the risk of connection point and liquid leakage.

[0048] In some specific embodiments, reference continues to be made to Figure 3 As shown, a shut-off valve 160 is provided on the portion of the first connector 1121 located between the second connector 1122 and the first main pipeline connector 111. The shut-off valve 160 can be a mechanical valve or a solenoid valve, preferably a solenoid valve, for ease of control.

[0049] Example 1:

[0050] The following is for reference. Figure 1 A multi-port connector 100 according to a specific embodiment of the present invention is described.

[0051] like Figure 1 As shown, the multi-way connector 100 is a four-way connector, which specifically includes a return water main pipe connector 110, an exhaust pipe connector 120, and two return water branch pipe connectors. The two return water branch pipe connectors are the first return water branch pipe connector 130 and the second return water branch pipe connector 140.

[0052] In this embodiment, the return water main pipe connector 110, the vent pipe connector 120, the first return water branch pipe connector 130, and the second return water branch pipe connector 140 are all cylindrical. The first return water branch pipe connector 130 is coaxially connected to the return water main pipe connector 110, and the second return water branch pipe connector 140 is vertically connected to the outer wall of the return water main pipe connector 110 and located directly below the return water main pipe connector 110. The return water main pipe connector 110 is cylindrical, and its diameter is larger than the diameters of the two return water branch pipe connectors. The vent is located at the top of the return water main pipe connector 110, and the vent pipe connector 120 is vertically connected to the return water main pipe connector 110 through the vent, and the vent pipe connector 120 and the second return water branch pipe connector 140 are collinear.

[0053] Example 2:

[0054] The following is for reference. Figure 2 A multi-port connector 100 is described in another specific embodiment of the present invention.

[0055] In this embodiment, as Figure 2As shown, the multi-way connector 100 is a four-way connector, which specifically includes a return water main pipe connector 110, an exhaust pipe connector 120, and two return water branch pipe connectors. The two return water branch pipe connectors are the first return water branch pipe connector 130 and the second return water branch pipe connector 140.

[0056] The return water main pipe connector 110 is in the shape of a stepped pipe. Specifically, the return water main pipe connector 110 includes a first main pipe connector 111 and a second main pipe connector 112 coaxially connected. The diameter of the first main pipe connector 111 is larger than the diameter of the second main pipe connector 112, and also larger than the diameters of the first return water branch pipe connector 130 and the second return water branch pipe connector 140. The vent is located at the top of the first main pipe connector 111, and the vent pipe connector 120 is vertically connected above the first main pipe connector 111 through the vent. The end of the second main pipe connector 112 away from the first main pipe connector 111 is used to connect to the return water main pipe, and the end of the first main pipe connector 111 away from the second main pipe connector 112 is used to connect to the first return water branch pipe connector 130. The second return water branch pipe connector 140 is vertically connected to the first main pipe connector 111 and is offset from the vent pipe connector 120.

[0057] Example 3:

[0058] The following is for reference. Figure 3 A multi-port connector 100 according to another specific embodiment of the present invention is described.

[0059] In this embodiment, as Figure 3 As shown, the multi-way connector 100 is a six-way connector, which specifically includes a return water main connector 110, an exhaust pipe connector 120, and three return water branch pipe connectors. The three return water branch pipe connectors are the first return water branch pipe connector 130, the second return water branch pipe connector 140, and the third return water branch pipe connector 150.

[0060] Specifically, the return water main pipe connector 110 includes a first main pipe connector 111 and a second main pipe connector 112 coaxially connected. The diameter of the first main pipe connector 111 is larger than the diameter of the second main pipe connector 112, and also larger than the diameter of the three return water branch pipe connectors. A first return water branch pipe connector 130 is coaxially connected to the end of the first main pipe connector 111 away from the second main pipe connector 112. The second return water branch pipe connector 140 and the third return water branch pipe connector 150 are both vertically connected to the outer wall surface of the first main pipe connector 111 and are spaced apart directly below the first main pipe connector 111.

[0061] The second main pipe joint 112 comprises a first joint 1121 and a second joint 1122 connected in a T shape, one end of the second joint 1122 is connected to the middle of the first joint 1121, the other end of the second joint 1122 is used for connecting a return water main pipe, one end of the first joint 1121 is coaxially connected to the end of the first main pipe joint 111 away from the second main pipe joint 112, and the other end is used for connecting another return water main pipe.

[0062] The exhaust port is located at the uppermost of the first main pipe joint 111, the exhaust pipe joint 120 is vertically connected above the first main pipe joint 111 through the exhaust port, and the exhaust pipe joint 120 is staggered with the second return water branch pipe joint 140 and the third return water branch pipe joint 150.

[0063] Compared with the existing multi-way joint, the multi-way joint 100 has the following advantages:

[0064] 1. The multi-way joint 100 is beneficial to more efficient and rapid exhaust of air in the pipe, reducing damage to the water pump.

[0065] 2. The multi-way joint 100 combines and welds multiple joints together, greatly reducing the number of leakage points of the pipe system and reducing the risk of liquid leakage.

[0066] 3. The multi-way joint 100 cooperates with the pipe arrangement to easily realize uniform distribution, whether it is a multi-branch parallel connection or a combination of series and parallel connection, it is suitable, and the versatility is strong. The multi-way joint 100 cooperates with the pipe arrangement, only needs to be fixed at a specific height position, without complex throttling design and simulation of each branch, good flow distribution effect can be achieved, the design cycle is shortened; at the same time, the types of joints are reduced, the incoming material and production management cost are reduced. The CFD fluid simulation test results show that the lowest and highest branch flow ratio is 98.7%, and the flow distribution is very uniform.

[0067] 4. The multi-way joint 100 can realize random combination of various parts and specifications, and can realize various functional requirements.

[0068] The application also provides a battery liquid cooling system, such as Figure 4 and Figure 5As shown, the battery liquid cooling system comprises a liquid cooling unit, a battery pack 200, an expansion water tank 300, valves, a clamp, a flow pipeline 400 and the above-mentioned multi-way joint 100, and the flow pipeline refers to the above-mentioned backwater main pipeline, backwater branch pipeline and exhaust pipeline which can be connected to the multi-way joint 100. The battery liquid cooling system uses the above-mentioned multi-way joint 100, which not only greatly improves the integration degree, reduces the indirect points and reduces the risk of liquid leakage, but also makes the exhaust pipeline always be located at a higher point, is beneficial to air exhaust, avoids the phenomenon that air is brought into the water pump by water flow, and improves the service life of the water pump.

[0069] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Based on the above-mentioned description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A multi-way connector, characterized in that, include: A return water main pipe connector (110) is provided. One end of the return water main pipe connector (110) is used to connect to the return water main pipe. The return water main pipe connector (110) is provided with a first channel through it along the axial direction. An exhaust port communicating with the first channel is provided at the highest point of the outer wall of the return water main pipe connector (110). An exhaust pipe connector (120) is provided, one end of which is used to connect to an exhaust pipe and the other end is connected to the exhaust port. The exhaust pipe connector (120) is provided with a second channel through the axial direction. The second channel is connected to the first channel through the exhaust port. At least two return water branch pipe joints, one end of which is connected to the other end of the return water main pipe joint (110), and one end of the remaining return water branch pipe joints is connected to the outer wall surface of the return water main pipe joint (110). The other end of each return water branch pipe joint is used to connect to a return water branch pipe, and each return water branch pipe joint is provided with a third channel through it along the axial direction. The third channel is connected to the first channel. All other return water branch pipe joints are offset from the exhaust pipe joint (120); The return water main pipe connector (110) is in the shape of a stepped pipe. The return water main pipe connector (110) includes a first main pipe connector (111) and a second main pipe connector (112) connected coaxially. The diameter of the first main pipe connector (111) is larger than the diameter of the second main pipe connector (112) and larger than the diameter of the return water branch pipe connector. The exhaust pipe connector (120) is vertically connected directly above the first main pipe connector (111). The end of the second main pipeline connector (112) away from the first main pipeline connector (111) is used to connect to the return water main pipeline; At least two of the aforementioned return water branch pipe joints are connected to the first main pipe joint (111); The second main pipeline connector (112) includes a first connector (1121) and a second connector (1122) connected in a T-shape. One end of the second connector (1122) is connected to the middle of the first connector (1121), and the other end is used to connect to one of the return water main pipelines. One end of the first connector (1121) is coaxially connected to the first main pipeline connector (111), and the other end is used to connect to another of the return water main pipelines.

2. The multi-way connector according to claim 1, characterized in that, The return water main pipe connector (110) is in the shape of a round pipe; The diameter of the main return water pipe connector (110) is larger than the diameter of the branch return water pipe connector, and the exhaust pipe connector (120) is vertically connected directly above the main return water pipe connector (110).

3. The multi-way connector according to claim 1, characterized in that, The number of return water branch pipe joints is two, namely the first return water branch pipe joint (130) and the second return water branch pipe joint (140). The first return water branch pipe joint (130) is coaxially connected to the end of the first main pipe joint (111) away from the second main pipe joint (112), and the second return water branch pipe joint (140) is connected directly below the first main pipe joint (111).

4. The multi-way connector according to claim 1, characterized in that, The number of return water branch pipe joints is three, including a first return water branch pipe joint (130), a second return water branch pipe joint (140), and a third return water branch pipe joint (150). The first return water branch pipe joint (130) is coaxially connected to the end of the first main pipe joint (111) away from the second main pipe joint (112). The second return water branch pipe joint (140) and the third return water branch pipe joint (150) are both connected directly below the first main pipe joint (111).

5. The multi-way connector according to claim 4, characterized in that, The second return water branch pipe joint (140) and the third return water branch pipe joint (150) are both offset from the exhaust pipe joint (120), and the exhaust pipe joint (120) is located closer to the second main pipe joint (112) than the second return water branch pipe joint (140) and the third return water branch pipe joint (150).

6. The multi-way connector according to claim 1, characterized in that, A shut-off valve (160) is provided on the portion of the first connector (1121) located between the second connector (1122) and the first main pipeline connector (111).

7. A battery liquid cooling system, characterized in that, The multi-port connector includes any one of claims 1-6.

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