CN113883351A

CN113883351A - Multi-way connector and battery liquid cooling system

Info

Publication number: CN113883351A
Application number: CN202111260885.5A
Authority: CN
Inventors: 赵长河; 李鸿键; 侯艳丽; 李玉军
Original assignee: Beijing Shengneng Energy Technology Co Ltd
Current assignee: Beijing Shengneng Energy Technology Co Ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-01-04

Abstract

The invention discloses a multi-way connector and a battery liquid cooling system, and belongs to the technical field of power batteries. The multi-way joint comprises a return water main pipeline joint, an exhaust pipeline joint and at least two return water branch pipeline joints, wherein the highest point of the outer wall surface of the return water main pipeline joint is provided with an exhaust port, the exhaust pipeline joint is connected to the exhaust port, one return water branch pipeline joint is coaxially connected to the end part of the return water main pipeline joint, and the rest return water branch pipeline joints are connected to the outer wall surface of the return water main pipeline joint. This multi-way joint can be in the same place four at least pipeline integrations, has improved the integrated level of battery liquid cooling system's pipe-line system to a very big extent, has reduced the tie point, has reduced the weeping risk. And this multi-way connection is through setting up the gas vent at the highest point department that the return water main line connects the outer wall face to make exhaust pipe connect at the high level through exhaust pipe joint, and then improved the exhaust convenience of air, avoided the air to be taken into the phenomenon emergence of water pump by rivers.

Description

Multi-way connector and battery liquid cooling system

Technical Field

The invention relates to the technical field of power batteries, in particular to a multi-way connector and a battery liquid cooling system.

Background

With the rapid decrease of conventional energy and the increasing severity of environmental conditions, power batteries are gradually popularized as clean energy and widely used in various fields. With the popularization and application of power battery systems including a plurality of battery packs in heavy vehicles such as heavy trucks, mine trucks and engineering machinery, battery liquid cooling systems used in cooperation with the battery packs are also gradually receiving attention from people. The battery liquid cooling system mainly exchanges heat with the high-temperature battery pack through low-temperature cooling liquid, so that heat generated by the battery pack is taken away, the working temperature of the battery pack is not too high, the temperature difference of the power battery is adjusted, and the working life of the power battery is ensured.

The existing battery liquid cooling system mainly comprises a liquid cooling unit, an expansion water tank, a pipeline, a joint, a clamp, a liquid cooling plate (generally integrated in a battery pack) and other parts. The joint is an important component of a battery liquid cooling system, and particularly, the multi-way joint plays a very important role in reducing leakage points, controlling flow distribution, exhausting pipelines and the like.

However, the design of the multi-way connector in the existing battery liquid cooling system has the following problems or defects:

1. the unreasonable design of current multi-way joint leads to battery liquid cooling system liquid feeding and exhaust effect when moving not good, and air admission water pump produces cavitation erosion, produces great influence to the water pump life-span.

2. The existing multi-way joint is mostly a three-way joint, and the number of connecting points is large due to the fact that pipelines in a battery liquid cooling system are more, and liquid leakage risks are large.

Therefore, how to provide a multi-way joint capable of improving the waterway exhaust effect, effectively reducing the number of connection points in a battery liquid cooling system, and reducing the liquid leakage risk is a technical problem which needs to be solved urgently.

Disclosure of Invention

The first purpose of the invention is to provide a multi-way joint, and the multi-way structure not only can connect more than three pipelines, effectively reduces connecting points, reduces the risk of liquid leakage, but also is beneficial to air flow and has good exhaust effect.

In order to achieve the purpose, the invention adopts the following technical scheme:

a multi-way junction comprising: the water return device comprises a water return main pipeline joint, a water return main pipeline and a water return pipeline joint, wherein one end of the water return main pipeline joint is used for being connected with a water return main pipeline, a first channel penetrates through the water return main pipeline joint along the axial direction, and an exhaust port communicated with the first channel is arranged at the highest point of the outer wall surface of the water return main pipeline joint; the exhaust pipeline joint is provided with a second channel in an axial penetrating manner, and the second channel is communicated with the first channel through the exhaust port; the water return device comprises at least two water return branch pipeline joints, wherein one end of one water return branch pipeline joint is connected to the other end of the water return main pipeline joint, one end of the other water return branch pipeline joints is connected to the outer wall surface of the water return main pipeline joint, the other end of each water return branch pipeline joint is used for being connected with a water return branch pipeline, a third channel penetrates through each water return branch pipeline joint along the axial direction, and the third channel is communicated with the first channel.

Preferably, the return water main pipeline joint is in a circular pipe shape; the diameter of the return water main pipeline joint is larger than that of the return water branch pipeline joint, and the exhaust pipeline joint is vertically connected right above the return water main pipeline joint.

Preferably, the backwater main pipeline joint is in a stepped tubular shape, the backwater main pipeline joint comprises a first main pipeline joint and a second main pipeline joint which are coaxially connected, the diameter of the first main pipeline joint is larger than that of the second main pipeline joint and larger than that of the backwater branch pipeline joint, and the exhaust pipeline joint is vertically connected right above the first main pipeline joint.

Preferably, one end of the second main pipeline joint, which is far away from the first main pipeline joint, is used for connecting the water return main pipeline; at least two return water branch pipeline joints are connected to the first main pipeline joint.

Preferably, the number of the return branch pipeline joints is two, and the return branch pipeline joints are respectively a first return branch pipeline joint and a second return branch pipeline joint, the first return branch pipeline joint is coaxially connected to one end of the first main pipeline joint, which is far away from the second main pipeline joint, and the second return branch pipeline joint is connected under the first main pipeline joint.

Preferably, the number of the return water branch pipeline joints is three, and the return water branch pipeline joints respectively comprise a first return water branch pipeline joint, a second return water branch pipeline joint and a third return water branch pipeline joint, the first return water branch pipeline joint is coaxially connected to one end, away from the second main pipeline joint, of the first main pipeline joint, and the second return water branch pipeline joint and the third return water branch pipeline joint are both connected under the first main pipeline joint.

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

Preferably, the second main pipeline joint comprises a first joint and a second joint which are connected in a T shape, one end of the second joint is connected to the middle of the first joint, the other end of the second joint is used for connecting one return water main pipeline, one end of the first joint is coaxially connected with the first main pipeline joint, and the other end of the first joint is used for connecting the other return water main pipeline.

Preferably, a shut-off valve is provided at a portion of the first joint between the second joint and the first main line joint.

The second purpose of the invention is to provide a battery liquid cooling system which has good exhaust effect and low liquid leakage risk.

a battery liquid cooling system comprises the multi-way connector.

The invention has the beneficial effects that:

the invention provides a multi-way joint which comprises a return water main pipeline joint, an exhaust pipeline joint and at least two return water branch pipeline joints, wherein one end of the return water main pipeline joint is used for being connected with a return water main pipeline, the return water main pipeline joint is provided with a first channel in an axial penetrating manner, the highest point of the outer wall surface of the return water main pipeline joint is provided with an exhaust port communicated with the first channel, one end of the exhaust pipeline joint is used for being connected with an exhaust pipeline, the other end of the exhaust pipeline joint is connected with the exhaust port, the exhaust pipeline joint is provided with a second channel in an axial penetrating manner, the second channel is communicated with the first channel through the exhaust port, one end of one return water branch pipeline joint is connected with the other end of the return water main pipeline joint, one end of the other return water branch pipeline joints is connected with the outer wall surface of the return water main pipeline joint, and the other end of each return water branch pipeline joint is used for being connected with a return water branch pipeline, and a third channel communicated with the first channel is arranged along the axial direction in a penetrating way at each return branch pipeline joint. This multi-way joint is through connecting integrated together with at least four pipelines to be in the same place at least four pipelines are integrated together, improved the integrated level of pipeline to a very big extent, reduced the quantity of tie point, reduced the weeping risk. And the exhaust port is arranged at the highest point of the outer wall surface of the joint of the return water main pipeline, so that the exhaust pipeline is connected at a high position through the exhaust pipeline joint, the convenience of air exhaust is improved, and the phenomenon that air is brought into the water pump by water flow is avoided.

Drawings

FIG. 1 is a schematic structural diagram of a multi-way junction according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a multi-way junction provided in the second embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a multi-way junction provided in a third embodiment of the present invention;

fig. 4 is a schematic structural diagram of a battery fluid cooling system provided by the present invention;

fig. 5 is another structural schematic diagram of the battery fluid cooling system provided by the invention.

In the figure:

100. a multi-way joint;

110. a return water main pipeline joint; 111. a first main pipeline joint; 112. a second main pipeline joint; 1121. a first joint; 1122. A second joint;

120. an exhaust pipe joint; 130. A first return water branch line joint; 140. A second return water branch pipeline joint; 150. a third return water branch pipeline joint; 160. a stop valve;

200. a battery pack; 300. an expansion tank; 400. a flow-through line.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides a multi-way joint 100, as shown in fig. 1 to 3, the multi-way joint 100 can be connected with multiple pipelines and used in a battery liquid cooling system to realize the communication and integration of the multiple pipelines in the battery liquid cooling system, thereby forming a pipeline system of the battery liquid cooling system. Of course, the multi-way joint 100 provided in this embodiment can be used in other devices or systems that require a pipe joint, besides a battery liquid cooling system.

Specifically, the multi-way joint 100 provided by the present embodiment includes a return water main pipeline joint 110, an exhaust pipeline joint 120, and at least two return water branch pipeline joints. The backwater main pipeline joint 110, the exhaust pipeline joint 120 and the backwater branch pipeline joint are all of tubular structures, each pipeline joint comprises an annular inner wall surface and an annular outer wall surface, and the inner wall surfaces enclose a channel allowing water and air to pass through. One end of the water return main pipeline joint 110 is used for connecting a water return main pipeline, and the other end is used for connecting one of the water return branch pipeline joints. Alternatively, the return water main pipe joint 110 and the return water branch pipe joint are coaxially disposed and connected by welding. The water return main pipeline joint 110 is provided with a first channel penetrating along the axial direction, and the first channel is a space surrounded by the inner wall surface of the water return main pipeline joint 110. An exhaust port communicated with the first channel is arranged at the highest point of the outer wall surface of the water return main pipeline joint 110. It should be noted that the highest point here refers to a position on the outer wall surface of the return water main pipeline joint 110 farthest from the central axis of the return water 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 return water main pipeline joint 110 is at the relatively highest position of the whole return water main pipeline joint 110 from the bottom surface of the device. Alternatively, the shape of the exhaust port is determined according to the cross-sectional shape of the return water branch pipe joint, and may be circular, directional, or other shapes.

One end of the exhaust pipeline joint 120 is used for connecting an exhaust pipeline, and the other end is connected to an exhaust port. The exhaust pipeline joint 120 is provided with a second passage axially penetrating therethrough, and the second passage is communicated with the first passage through an exhaust port. Except for the return water branch pipe joint coaxially connected to the return water main pipe joint 110, one end of each of the remaining return water branch pipe joints is connected to an outer wall surface of the return water main pipe joint 110. The other end of each return branch pipe joint, which is far away from the return main pipe joint 110, can be connected with a return branch pipe respectively. And each return water branch pipeline joint is provided with a third channel in an axial penetrating manner, and the third channel is communicated with the first channel.

Since the multi-way joint 100 integrates the return water main pipeline joint 110, the exhaust pipeline joint 120, and at least two return water branch pipeline joints, at least four pipelines can be integrated together by using the multi-way joint 100. Compared with a 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 level of a pipeline system and reduce the number of connection points, thereby being beneficial to reducing the risk of liquid leakage. And this multi-way connection 100 passes through the exhaust pipe and connects exhaust pipe in exhaust vent department through exhaust pipe joint 120 through setting up the gas vent in the highest point department of return water main pipeline joint 110 outer wall face, can guarantee that exhaust pipe is in relatively highest position, considers the density of air, so set up can improve the convenience that air discharged multi-way connection 100 and pipe-line system, has avoided the phenomenon that the air is brought into pipe-line system's water pump by rivers to take place.

It should be noted that the connection mode of the pipeline joints and the pipeline is not limited to clamp connection, and quick-insertion and expansion connection modes are also feasible as long as stable connection can be realized. The material of the pipe joint and the pipe is not limited to stainless steel, but aluminum material and nylon material are also possible.

In some embodiments, as shown in fig. 1, the water return main pipeline joint 110 is in a circular pipe shape, the diameter of the water return main pipeline joint 110 is larger than that of the water return branch pipeline joint, the exhaust port is arranged at the upper part of the water return main pipeline joint 110, and the exhaust pipeline joint 120 is vertically connected to the position right above the water return main pipeline joint 110 through the exhaust port. Because the diameter of the return water main pipeline joint 110 is larger than that of the return water branch pipeline joint, the return water main pipeline joint 110 is higher than the return water branch pipeline joint, and the exhaust port is arranged at the upper part of the return water main pipeline joint 110, so that the exhaust pipeline joint 120 and the exhaust pipeline of the exhaust pipeline joint 120 are at the highest point, thereby facilitating air exhaust and prolonging the service life of the water pump.

In some embodiments, as shown in FIG. 2, the return water main line joint 110 is stepped tubular. Specifically, the return water main pipeline joint 110 includes a first main pipeline joint 111 and a second main pipeline joint 112 that are coaxially connected, the first main pipeline joint 111 and the second main pipeline joint 112 are both in a circular tube shape, and the diameter of the first main pipeline joint 111 is greater than that of the second main pipeline joint 112 and is greater than that of the return water branch pipeline joint. The vent is provided at the first main pipe joint 111, and the exhaust pipe joint 120 is vertically connected to the first main pipe joint 111 through the vent. One end, far away from the first main pipeline joint 111, of the second main pipeline joint 112 is used for being connected with a water return main pipeline, one water return branch pipeline joint is coaxially connected to the end, far away from the second main pipeline joint 112, of the first main pipeline joint 111, and the other water return branch pipeline joints are connected to the outer wall surface of the first main pipeline joint 111.

The backwater main pipeline joint 110 is arranged to be in a stepped pipe shape, and the vent is arranged on the first main pipeline joint 111 with a larger size, so that the exhaust pipeline joint 120 and the exhaust pipeline connected with the vent are located at the highest points, air is conveniently exhausted, and the service life of the water pump is prolonged.

In some embodiments, with continued reference to fig. 1 and 2, the number of return water branch connections may be two. The two return branch pipe joints are respectively 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 one end of the first main pipe joint 111 far away from the second main pipe joint 112, and the second return branch pipe joint 140 is connected under the first main pipe joint 111. Therefore, the multi-way joint 100 can form a four-way joint, the four pipelines can be communicated and integrated, the integration level is high, and the risk of leakage of connection points and liquid can be reduced.

In some embodiments, as shown in fig. 3, the number of the water return branch pipe joints is three, the three water return branch pipe joints respectively include a first water return branch pipe joint 130, a second water return branch pipe joint 140, and a third water return branch pipe joint 150, the first water return branch pipe joint 130 is coaxially connected to one end of the first main pipe joint 111 away from the second main pipe joint 112, and the second water return branch pipe joint 140 and the third water return branch pipe joint 150 are both connected right below the first main pipe joint 111. Optionally, the second return branch pipe joint 140 and the third return branch pipe joint 150 are both disposed in a staggered manner with respect to the exhaust pipe joint 120, and the exhaust pipe joint 120 is disposed close to the second main pipe joint 112 with respect to the second return branch pipe joint 140 and the third return branch pipe joint 150.

Further, as shown in fig. 3, the second main pipeline joint 112 further includes a first joint 1121 and a second joint 1122 that are 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 is used for connecting a water return main pipeline, one end of the first joint 1121 is coaxially connected to the first main pipeline joint 111, and the other end of the first joint is used for connecting another water return main pipeline. Therefore, the multi-way joint 100 can form a six-way joint, communication and integration of six pipelines are realized, the integration level is higher, and the risk of connection points and liquid leakage can be further reduced.

In some specific embodiments, and with continued reference to fig. 3, a shut-off valve 160 is disposed on a portion of first junction 1121 between second junction 1122 and first main line junction 111. The shut-off valve 160 may be a mechanical valve or a solenoid valve, preferably a solenoid valve, for easy control.

The first embodiment is as follows:

referring now to FIG. 1, a multi-way junction 100 according to one embodiment of the present invention is described.

As shown in fig. 1, the multi-way joint 100 is a four-way joint, and specifically includes a return water main pipe joint 110, an exhaust pipe joint 120, and two return water branch pipe joints, which are a first return water branch pipe joint 130 and a second return water branch pipe joint 140, respectively.

In this embodiment, the return water main pipe joint 110, the exhaust pipe joint 120, the first return water branch pipe joint 130, and the second return water branch pipe joint 140 are all in a circular pipe shape, the first return water branch pipe joint 130 is coaxially connected with the return water main pipe joint 110, and the second return water branch pipe joint 140 is vertically connected to the outer wall surface of the return water main pipe joint 110 and is located right below the return water main pipe joint 110. The return water main pipeline joint 110 is in a circular pipe shape, the diameter of the return water main pipeline joint 110 is larger than the diameters of the two return water branch pipeline joints, the exhaust port is located at the uppermost part of the return water main pipeline joint 110, the exhaust pipeline joint 120 is vertically connected right above the return water main pipeline joint 110 through the exhaust port, and the exhaust pipeline joint 120 and the second return water branch pipeline joint 140 are arranged in a collinear mode.

Example two:

referring now to fig. 2, a multi-way junction 100 in accordance with another embodiment of the present invention is described.

In this embodiment, as shown in fig. 2, the multi-way joint 100 is a four-way joint, and specifically includes a water return main pipeline joint 110, an exhaust pipeline joint 120, and two water return branch pipeline joints, where the two water return branch pipeline joints are a first water return branch pipeline joint 130 and a second water return branch pipeline joint 140, respectively.

The return water main pipeline joint 110 is in a stepped pipe shape. Specifically, the return water main pipeline joint 110 includes a first main pipeline joint 111 and a second main pipeline joint 112 that are coaxially connected, and a diameter of the first main pipeline joint 111 is larger than a diameter of the second main pipeline joint 112 and is larger than diameters of the first return water branch pipeline joint 130 and the second return water branch pipeline joint 140. The exhaust port is located at the uppermost portion of the first main pipe joint 111, and the exhaust pipe joint 120 is vertically connected to the upper portion of the first main pipe joint 111 through the exhaust port. The end of the second main pipeline joint 112 away from the first main pipeline joint 111 is used for connecting a water return main pipeline, and the end of the first main pipeline joint 111 away from the second main pipeline joint 112 is used for connecting a first water return branch pipeline joint 130. The second return branch pipe joint 140 is vertically connected to the first main pipe joint 111, and is disposed to be staggered with the exhaust pipe joint 120.

Example three:

referring now to fig. 3, a multi-way junction 100 in accordance with yet another embodiment of the present invention is described.

In this embodiment, as shown in fig. 3, the multi-way joint 100 is a six-way joint, and specifically includes a water return main pipe joint 110, an exhaust pipe joint 120, and three water return branch pipe joints, where the three water return branch pipe joints are respectively a first water return branch pipe joint 130, a second water return branch pipe joint 140, and a third water return branch pipe joint 150.

Specifically, the return water main pipeline joint 110 includes a first main pipeline joint 111 and a second main pipeline joint 112 that are coaxially connected, and the diameter of the first main pipeline joint 111 is larger than that of the second main pipeline joint 112, and is larger than that of the three return water branch pipeline joints. One end of the first main pipeline joint 111, which is far away from the second main pipeline joint 112, is coaxially connected with a first return branch pipeline joint 130, and the second return branch pipeline joint 140 and the third return branch pipeline joint 150 are both vertically connected to the outer wall surface of the first main pipeline joint 111 and are arranged right below the first main pipeline joint 111 at intervals.

The second main pipeline joint 112 includes a first joint 1121 and a second joint 1122 that are 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 water return main pipeline, one end of the first joint 1121 is coaxially connected to one end of the first main pipeline joint 111 that is far away from the second main pipeline joint 112, and the other end of the first joint 1121 is used for connecting another water return main pipeline.

The exhaust port is located at the uppermost part of the first main pipeline joint 111, the exhaust pipeline joint 120 is vertically connected right above the first main pipeline joint 111 through the exhaust port, and the exhaust pipeline joint 120, the second return branch pipeline joint 140 and the third return branch pipeline joint 150 are arranged in a staggered mode.

Compared with the conventional multi-way connector, the multi-way connector 100 provided by the invention has the following advantages:

1. the multi-way joint 100 is beneficial to more efficiently and quickly discharging air in a pipeline, and reduces the damage to a water pump.

2. This multi-way joint 100 combines the welding together with multiple joint, has significantly reduced pipe-line system's leak source quantity, reduces the weeping risk.

3. The multi-way connector 100 is matched with pipeline arrangement, uniform distribution is easily achieved, multiple branches are connected in parallel, the serial-parallel combination scheme is applicable, and universality is high. The multi-way joint 100 is matched with pipeline arrangement, only needs to be fixed at a specific height position, does not need to perform complex throttling design and simulation on each branch, can achieve a good flow distribution effect, and shortens the design period; meanwhile, the connector types are reduced, and the incoming material and production management cost are reduced. The CFD fluid simulation test result shows that the flow ratio of the lowest branch to the highest branch is 98.7%, and the flow distribution is very uniform.

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

The invention also provides a battery liquid cooling system, as shown in fig. 4 and 5, the battery liquid cooling system comprises a liquid cooling unit, a battery pack 200, an expansion tank 300, a valve, a clamp, a circulation pipeline 400 and the multi-way joint 100, wherein the circulation pipeline refers to the return water main pipeline, the return water branch pipeline and the exhaust pipeline which can be connected to the multi-way joint 100. This battery liquid cooling system is through using above-mentioned multi-way connection 100, has not only improved the integrated level to a great extent, has reduced the indirect point, has reduced the weeping risk, and makes exhaust pipe be located the higher point all the time, does benefit to the air escape, has avoided the air to be taken into the phenomenon emergence of water pump by rivers, has improved the life of water pump.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A multi-way junction, comprising:

the water return device comprises a water return main pipeline joint (110), wherein one end of the water return main pipeline joint (110) is used for being connected with a water return main pipeline, a first channel penetrates through the water return main pipeline joint (110) along the axial direction, and an exhaust port communicated with the first channel is arranged at the highest point of the outer wall surface of the water return main pipeline joint (110);

the exhaust pipeline joint (120) is used for connecting an exhaust pipeline, one end of the exhaust pipeline joint (120) is connected to the exhaust port, the other end of the exhaust pipeline joint is connected to the exhaust port, a second channel penetrates through the exhaust pipeline joint (120) along the axial direction, and the second channel is communicated with the first channel through the exhaust port;

the water return device comprises at least two water return branch pipeline joints, wherein one end of one water return branch pipeline joint is connected to the other end of the water return main pipeline joint (110), one end of the other water return branch pipeline joints is connected to the outer wall surface of the water return main pipeline joint (110), the other end of each water return branch pipeline joint is used for being connected with a water return branch pipeline, each water return branch pipeline joint is provided with a third channel in an axially penetrating mode, and the third channel is communicated with the first channel.

2. The multiplexing joint of claim 1,

the return water main pipeline joint (110) is in a circular pipe shape;

the diameter of the return water main pipeline joint (110) is larger than that of the return water branch pipeline joint, and the exhaust pipeline joint (120) is vertically connected to the position right above the return water main pipeline joint (110).

3. The multiplexing joint of claim 1,

the backwater main pipeline joint (110) is in a stepped tubular shape, the backwater main pipeline joint (110) comprises a first main pipeline joint (111) and a second main pipeline joint (112) which are coaxially connected, the diameter of the first main pipeline joint (111) is larger than that of the second main pipeline joint (112) and larger than that of the backwater branch pipeline joint, and the exhaust pipeline joint (120) is perpendicularly connected right above the first main pipeline joint (111).

4. The multi-way junction according to claim 3,

one end, far away from the first main pipeline joint (111), of the second main pipeline joint (112) is used for being connected with the water return main pipeline;

at least two return water branch pipe joints are connected to the first main pipe joint (111).

5. The multi-way junction according to claim 4,

the water return branch pipe joints are two in number and are respectively a first water return branch pipe joint (130) and a second water return branch pipe joint (140), the first water return branch pipe joint (130) is coaxially connected to one end, away from the second main pipe joint (112), of the first main pipe joint (111), and the second water return branch pipe joint (140) is connected under the first main pipe joint (111).

6. The multi-way junction according to claim 4,

the water return branch pipe joints are three in number and respectively comprise a first water return branch pipe joint (130), a second water return branch pipe joint (140) and a third water return branch pipe joint (150), the first water return branch pipe joint (130) is coaxially connected to one end, away from the second main pipe joint (112), of the first main pipe joint (111), and the second water return branch pipe joint (140) and the third water return branch pipe joint (150) are connected to the position under the first main pipe joint (111).

7. The multi-way junction of claim 6,

the second water return branch pipe joint (140) and the third water return branch pipe joint (150) are arranged in a staggered mode with the exhaust pipe joint (120), and relative to the second water return branch pipe joint (140) and the third water return branch pipe joint (150), the exhaust pipe joint (120) is close to the second main pipe joint (112).

8. The multi-way junction according to claim 3,

the second main pipeline joint (112) comprises a first joint (1121) and a second joint (1122) which are 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 is used for being connected with one water return main pipeline, one end of the first joint (1121) is coaxially connected with the first main pipeline joint (111), and the other end of the first joint is used for being connected with the other water return main pipeline.

9. The multi-way junction of claim 8,

a stop valve (160) is provided at a portion of the first joint (1121) between the second joint (1122) and the first main line joint (111).

10. A battery liquid cooling system comprising the multi-way connector of any one of claims 1-9.