Liquid cooling pipeline of electric energy storage system

Abstract

The present invention provides a liquid cooling pipeline for an electric energy storage system, comprising: a liquid infusion pipeline, the liquid infusion pipeline having a liquid inlet pipe and a liquid return pipe, the liquid inlet pipe being located in the liquid return pipe; a liquid supply connector, the liquid supply connector having a liquid supply end and a first liquid inlet end that are interconnected, the liquid supply end being connected to the coolant inlet of the battery, the first liquid inlet end being connected to the liquid inlet pipe so that the coolant enters the battery via the first liquid inlet end and the liquid supply end; a liquid return connector, the liquid return connector having a liquid return end and a first liquid outlet end that are interconnected, the liquid return end being connected to the coolant outlet of the battery, the first liquid outlet end being connected to the liquid return pipe so that the coolant in the battery is discharged into the liquid return pipe via the liquid return end and the first liquid outlet end. The present invention discloses a liquid cooling pipeline for an electric energy storage system, which reduces the space occupied by the liquid cooling pipeline. At the same time, it reduces the amount of pipeline materials, reduces the costs of various links such as liquid cooling pipeline inventory and installation, and has lower energy loss.

Description

Technical Field

[0001] The present invention relates to the field of energy storage equipment, and in particular to a liquid cooling pipeline of an electric energy storage system. Background Art

[0002] With the rapid development of clean energy, energy storage systems are becoming increasingly large. Individual energy storage units are becoming larger, storing more electricity. Consequently, the number of cells within each unit is increasing, generating more heat during system operation, and placing increasing demands on thermal management systems. To ensure safe and reliable system operation, energy storage system designs incorporate temperature control and fire protection systems. Temperature control is further categorized into air cooling and liquid cooling systems.

[0003] The current mainstream container energy storage system consists of a battery system, a fire protection system, a temperature control system (air cooling or liquid cooling), and a power distribution system. The entire energy storage system is highly integrated.

[0004] As containerized energy storage technology matures, existing system configurations are reaching their limits. Free space within containerized energy storage systems is becoming increasingly scarce, and highly intensive systems are placing higher demands on temperature management. For example, patent application number CN201922233752.3, titled "Energy Storage Battery Container," discloses an energy storage battery container with separate coolant inlet and return pipes. This liquid cooling system occupies a significant amount of space, limiting the number of batteries that can be installed in the containerized energy storage system. Furthermore, both the supply and return pipes experience a temperature difference from the ambient temperature, resulting in significant energy loss. Summary of the Invention

[0005] The object of the present invention is to provide a liquid cooling pipe for an electric energy storage system, which reduces the space occupied by the liquid cooling pipe and reduces the energy loss during operation.

[0006] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: A liquid cooling pipeline of an electric energy storage system, comprising: a liquid infusion pipeline, the liquid infusion pipeline having a liquid inlet pipe and a liquid return pipe, the liquid inlet pipe being located in the liquid return pipe; a liquid supply joint, the liquid supply joint having a liquid supply end and a first liquid inlet end that are interconnected, the liquid supply end being connected to the coolant inlet of the battery, the first liquid inlet end being connected to the liquid inlet pipe so that the coolant enters the battery via the first liquid inlet end and the liquid supply end; a liquid return joint, the liquid return joint having a liquid return end and a first liquid outlet end that are interconnected, the liquid return end being connected to the coolant outlet of the battery, the first liquid outlet end being connected to the liquid return pipe so that the coolant in the battery is discharged into the liquid return pipe via the liquid return end and the first liquid outlet end.

[0007] Furthermore, the liquid supply joint includes a first outer tube, a first inner tube and a first connecting tube; the first outer tube is connected to the liquid return tube, the first inner tube is located inside the first outer tube, the first inner tube is connected to the liquid inlet tube, one end of the first connecting tube passes through the tube wall of the first outer tube and is connected to the first inner tube, and the other end of the first connecting tube is connected to the liquid supply end.

[0008] Furthermore, the liquid return joint includes a second outer tube and a second inner tube; the second outer tube is connected to the liquid return tube, the second inner tube is located inside the second outer tube, the second inner tube is connected to the liquid inlet tube, and the liquid return end is provided on the outer wall of the second outer tube and is connected to the channel between the second outer tube and the second inner tube.

[0009] Furthermore, the liquid return pipe includes a first liquid return branch pipe and a second liquid return branch pipe, and the liquid inlet pipe includes a first liquid inlet branch pipe and a second liquid inlet branch pipe; one end of the first liquid inlet branch pipe is connected to one end of the first inner pipe, and one end of the second liquid inlet branch pipe is connected to the other end of the first inner pipe; one end of the first liquid return branch pipe is connected to one end of the first outer pipe, the first liquid inlet branch pipe is located in the first liquid return branch pipe, the other end of the first outer pipe is connected to one end of the second liquid return branch pipe, one end of the second outer pipe is connected to the other end of the second liquid return branch pipe, and the second liquid inlet branch pipe is located in the second liquid return branch pipe.

[0010] Furthermore, it also includes a connecting joint, which has a liquid inlet pipeline and a liquid outlet pipeline; one end of the liquid inlet pipeline is connected to the other end of the first liquid inlet branch pipe, and one end of the liquid outlet pipeline is connected to the other end of the first liquid return branch pipe.

[0011] Furthermore, the liquid outlet pipeline includes a third outer tube and a first pipe head, one end of the third outer tube is connected to the first liquid return branch pipe, and the other end of the third outer tube is connected to the first pipe head; the liquid inlet pipeline includes a second pipe head, a second connecting pipe and a third inner tube, the third inner tube is located in the third outer tube, one end of the third inner tube is connected to the other end of the first liquid inlet branch pipe, the second pipe head is communicated with the third outer tube, one end of the second connecting pipe is connected to the other end of the third inner tube, and the other end of the second connecting pipe is connected to the second pipe head.

[0012] Furthermore, the center line of the second connecting tube is perpendicular to the center line of the third inner tube, and the liquid supply joint, the liquid return joint and the second pipe head are oriented in the same direction.

[0013] Furthermore, a plurality of connecting pieces are provided between the first inner tube and the first outer tube, between the second inner tube and the second outer tube, between the first liquid return branch pipe and the first liquid inlet branch pipe, and between the second liquid return branch pipe and the second liquid inlet branch pipe.

[0014] Furthermore, it also includes a tail pipe, which includes a fourth outer tube, a fourth inner tube and a baffle, one end of the fourth outer tube is connected to the other end of the second outer tube, one end of the fourth inner tube is connected to the other end of the second inner tube, and the other end of the fourth outer tube and the other end of the fourth inner tube are both connected to the baffle.

[0015] Furthermore, a thermal fuse is provided on the inner wall of the first outer tube and the interior of the second outer tube, and the first outer tube is welded to the first liquid return branch pipe and the second liquid return branch pipe via the thermal fuse, and the second outer tube is welded to the second liquid return branch pipe and the fourth outer tube via the thermal fuse; a thermal melt joint is provided on the outer wall of the first outer tube and the outer wall of the second outer tube, and the first outer tube and the second outer tube are welded to the battery via the thermal melt joint.

[0016] Analysis shows that the present invention discloses a liquid cooling pipeline for an electric energy storage system. This invention reduces the space occupied by the liquid cooling pipeline, reduces the amount of piping materials, and lowers costs in various aspects, such as inventory and installation of the liquid cooling pipeline. Furthermore, it reduces energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0018] Figure 1 A schematic cross-sectional view of the structure of an embodiment of the present invention.

[0019] Figure 2 A schematic front view of the structure of an embodiment of the present invention.

[0020] Figure 3 A schematic diagram of the connecting joint structure according to an embodiment of the present invention.

[0021] Figure 4 A schematic structural diagram of a liquid supply connector according to an embodiment of the present invention.

[0022] Figure 5 A schematic structural diagram of a liquid return joint according to an embodiment of the present invention.

[0023] Explanation of the accompanying drawings: 1. first outer tube; 2. first inner tube; 3. first connecting tube; 4. liquid supply end; 5. second outer tube; 6. second inner tube; 7. liquid return end; 8. first liquid inlet branch tube; 9. second liquid inlet branch tube; 10. first liquid return branch tube; 11. second liquid return branch tube; 12. third outer tube; 13. third inner tube; 14. second connecting tube; 15. first tube head; 16. second tube head; 17. fourth outer tube; 18. fourth inner tube; 19. baffle; 20. thermal fuse; 21. thermal melt joint. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the present invention and is not intended to limit the present invention. Indeed, it will be apparent to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is intended that the present invention encompasses such modifications and variations as come within the scope of the appended claims and their equivalents.

[0025] In the description of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected", "connected", and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and the description have been used to refer to like or similar parts of the present invention. As used herein, the terms "first," "second," "third," and "fourth," etc. are used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of individual components.

[0027] like Figure 1-2As shown, according to an embodiment of the present invention, a liquid cooling pipeline of an electric energy storage system is provided, the container battery includes several rows of battery clusters, the battery cluster includes multiple batteries arranged up and down, each battery has a coolant inlet and a coolant outlet, the liquid supply joint and the liquid return joint are configured corresponding to the battery, the coolant is supplied to the liquid cooling pipeline through a main pipeline, and the coolant is recovered through another main pipeline, including: the liquid infusion pipeline has a liquid inlet pipe and a liquid return pipe, the liquid inlet pipe is located in the liquid return pipe; the liquid supply joint has a liquid supply end 4 and a first liquid inlet end that are interconnected, the liquid supply end 4 is connected to the coolant inlet of the battery, the first liquid inlet end is connected to the liquid inlet pipe so that the coolant enters the battery through the first liquid inlet end and the liquid supply end 4; the liquid return joint has a liquid return end 7 and a first liquid outlet that are interconnected, the liquid return end 7 is connected to the coolant outlet of the battery, and the first liquid outlet end is connected to the liquid return pipe so that the coolant in the battery passes through the liquid return end 7 and the first liquid outlet The end is discharged into the return liquid pipe, and the first liquid outlet end is connected to the return liquid pipe so that the coolant in the battery is discharged into the return liquid pipe through the return liquid end 7 and the first liquid outlet end. The coolant enters the cooling channel inside the battery through the liquid supply joint. The coolant flows out from the return liquid joint after completing heat exchange inside the battery. The liquid supply joint and the return liquid joint constitute a transit structure for the circulation of battery coolant. The first liquid inlet branch pipe 8 is located in the return liquid pipe. The first liquid inlet branch pipe 8 only exchanges heat with the return liquid pipe during the process of transporting the coolant. This heat exchange method reduces the energy loss during the input of the coolant. Compared with traditional cooling equipment directly exposed to the air, the first liquid inlet branch pipe 8 and the second liquid inlet branch pipe 9 are not directly in contact with the external environment. Only the return liquid pipe is in contact with the environment. The contact surface is less and the energy loss will be smaller. Because it is a double-layer pipe, such as the heat radiated outward by the inner layer of the liquid supply pipe in winter, the outer layer of the reflux medium can absorb this part of the heat for recycling. The greater the temperature difference, the faster the energy transfer. The temperature difference between the first and second liquid inlet branches 8, 9 and the environment is the greatest. With the return pipe as a barrier, the temperature difference between the pipe's outer wall and the environment is smaller, resulting in less energy loss. Because the first liquid inlet branch 8 is located within the return pipe, the liquid inlet and return are integrated into the same pipe. This design significantly reduces the space occupied by the liquid cooling pipe and increases the energy storage density of the container battery.

[0028] Preferably, if Figure 4As shown, the liquid supply joint includes a first outer tube 1, a first inner tube 2 and a first connecting tube 3; the first outer tube 1 is connected to the liquid return pipe, the first inner tube 2 is located in the first outer tube 1, the first inner tube 2 is connected to the liquid inlet pipe, one end of the first connecting tube 3 passes through the tube wall of the first outer tube 1 and is connected to the first inner tube 2, and the other end of the first connecting tube 3 is connected to the liquid supply end 4, one end of the first inner tube 2 is the first liquid inlet end, the liquid supply joint consists of a first outer tube 1, a first inner tube 2 and a first connecting tube 3, the first connecting tube 3 is equivalent to a channel connecting the liquid supply end 4 with the first inner tube 2, the coolant enters from one end of the first inner tube 2, and enters the interior of the battery through the first connecting tube 3 and the liquid supply end 4, the first inner tube 2 and the first outer tube 1 are separated by the design of the first connecting tube 3, and the first inner tube 2 can pass through the first outer tube 1 to supply cooling water to the battery.

[0029] Preferably, the liquid return pipe includes a first liquid return branch pipe 10 and a second liquid return branch pipe 11, and the liquid inlet pipe includes a first liquid inlet branch pipe 8 and a second liquid inlet branch pipe 9; one end of the first liquid inlet branch pipe 8 is connected to one end of the first inner pipe 2, and one end of the second liquid inlet branch pipe 9 is connected to the other end of the first inner pipe 2; one end of the first liquid return branch pipe 10 is connected to one end of the first outer pipe 1, the first liquid inlet branch pipe 8 is located in the first liquid return branch pipe 10, the other end of the first outer pipe 1 is connected to one end of the second liquid return branch pipe 11, one end of the second outer pipe 5 is connected to the other end of the second liquid return branch pipe 11, and the second liquid inlet branch pipe 9 is located in the second liquid return branch pipe 1 1, the liquid return pipe is composed of two branch pipes at both ends. The first liquid return branch pipe 10 and the second liquid return branch pipe 11 are connected to the two ends of the first outer pipe 1, thereby forming a liquid delivery channel from the liquid return joint to the liquid supply joint. The coolant is delivered through this delivery channel. Usually, the diameter of the first outer pipe 1 is larger than the diameter of the first liquid return branch pipe 10 and the second liquid return branch pipe 11 to facilitate installation. The first liquid inlet branch pipe 8, the second liquid inlet branch pipe 9, the first liquid return branch pipe 10 and the second liquid return branch pipe 11 can be made of PPS (polyphenylene sulfide), PA12 (polylaurolactam), PERT (heat-resistant polyethylene), modified nylon and the like.

[0030] Preferably, if Figure 5As shown, the liquid return joint includes a second outer tube 5 and a second inner tube 6; the second outer tube 5 is connected to the liquid return pipe, the second inner tube 6 is located in the second outer tube 5, the second inner tube 6 is connected to the liquid inlet pipe, and the liquid return end 7 is provided on the outer wall of the second outer tube 5 and is connected to the channel between the second outer tube 5 and the second inner tube 6. One end of the second outer tube 5 is the first liquid return end 7, the second inner tube 6 is connected to the first inner tube 2 through a second liquid inlet branch pipe 9, and the second liquid inlet branch pipe 9 is located in the second liquid return branch pipe 11. The coolant flowing back from the liquid return end 7 directly enters the second outer tube 5. The second outer tube 5 is connected to the liquid return pipe. The coolant flows out of the battery through the liquid return pipe. Multiple embodiments of the present invention can be connected in series, that is, the first liquid inlet branch pipe 8 of another liquid cooling pipe is connected to the other end of the second inner tube 6, and another liquid return pipe is connected to the other end of the second outer tube 5, thereby realizing the series connection of liquid inlet and liquid return, and realizing that one liquid supply line can cool multiple batteries at the same time.

[0031] Preferably, if Figure 3 As shown, it also includes a connecting joint, which has a liquid inlet pipeline and a liquid outlet pipeline; one end of the liquid inlet pipeline is connected to the other end of the first liquid inlet branch pipe 8, and one end of the liquid outlet pipeline is connected to the other end of the first liquid return branch pipe 10. The entire liquid cooling pipeline adds coolant through the liquid inlet pipeline and recovers the coolant through the liquid outlet pipeline. The connecting joint realizes centralized management of the coolant and connection with external liquid supply equipment and recovery equipment.

[0032] Preferably, the liquid outlet pipeline includes a third outer tube 12 and a first pipe head 15, one end of the third outer tube 12 is connected to the first liquid return branch pipe 10, and the other end of the third outer tube 12 is connected to the first pipe head 15; the liquid inlet pipeline includes a second pipe head 16, a second connecting pipe 14 and a third inner tube 13, the third inner tube 13 is located in the third outer tube 12, one end of the third inner tube 13 is connected to the other end of the first liquid inlet branch pipe 8, the second pipe head 16 is connected to the third outer tube 12, one end of the second connecting pipe 14 is connected to the other end of the third inner tube 13, and the other end of the second connecting pipe 14 is connected to the second pipe head 16, the liquid inlet pipeline extends from the inside of the third outer tube 12 through the pipe wall of the third outer tube 12, that is, the liquid inlet pipeline is also located in the third outer tube 12, and will not directly exchange heat with the outside. The coolant after heat exchange will flow into the external recovery equipment through the liquid outlet pipeline.

[0033] Preferably, the center line of the second connecting tube 14 is perpendicular to the center line of the third inner tube 13, and the liquid supply joint, liquid return joint and second pipe head 16 are oriented in the same direction. Usually, the liquid supply joint, liquid return joint and second pipe head 16 are all located on the same side of the liquid cooling pipe, so as to facilitate connection with the battery and external recovery equipment and liquid supply equipment.

[0034] Preferably, a plurality of connecting plates are provided between the first inner tube 2 and the first outer tube 1, between the second inner tube 6 and the second outer tube 5, between the first liquid return branch pipe 10 and the first liquid inlet branch pipe 8, and between the second liquid return branch pipe 11 and the second liquid inlet branch pipe 9. The connecting plates serve to strengthen the connection of the internal structure. The connecting plates can make the connection between the "inner tube" and the "outer tube" of the present invention more stable.

[0035] Preferably, a tail pipe is also included, which includes a fourth outer tube 17, a fourth inner tube 18 and a baffle 19. One end of the fourth outer tube 17 is connected to the other end of the second outer tube 5, and one end of the fourth inner tube 18 is connected to the other end of the second inner tube 6. The other end of the fourth outer tube 17 and the other end of the fourth inner tube 18 are both connected to the baffle 19. When the present invention is not connected to subsequent liquid cooling pipes, the fourth outer tube 17 and the fourth inner tube 18 are blocked by the baffle 19 to prevent the coolant from continuing to circulate, thereby realizing the complete circulation of the electrolyte.

[0036] Preferably, a thermal fuse 20 is provided on the inner wall of the first outer tube 1 and the interior of the second outer tube 5. The first outer tube 1 is welded to the first liquid return branch tube 10 and the second liquid return branch tube 11 via the thermal fuse 20. The second outer tube 5 is welded to the second liquid return branch tube 11 and the fourth outer tube 17 via the thermal fuse 20. The thermal fuse 20 enables electrically heated welding of the first liquid return branch tube 10, the second liquid return branch tube 11, and the second liquid return branch tube 11 and the fourth outer tube 17.

[0037] A hot melt joint 21 is provided on the outer wall of the first outer tube 1 and the outer wall of the second outer tube 5. The first outer tube 1 and the second outer tube 5 are melted to the battery through the hot melt joint 21. The hot melt joint 21 can realize the quick connection of the first outer tube 1 and the second outer tube 5 and the battery. When in use, the hot melt joint 21 is inserted into the chuck corresponding to the battery to complete the connection of the liquid cooling pipe.

[0038] From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the present invention reduces the space occupied by the liquid cooling pipeline. It also reduces the amount of piping material, lowering costs in various aspects such as inventory and installation of the liquid cooling pipeline. In the present invention, the outer periphery of the liquid supply pipeline is a return pipe, and the heat dissipated into the return liquid is effectively recycled. Therefore, energy loss only occurs between the return pipe and the surrounding environment, resulting in lower energy loss.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A liquid cooling pipeline for an electric energy storage system, characterized in that: include: An infusion pipeline, the infusion pipeline comprising an inlet pipe and a return pipe, the inlet pipe being located inside the return pipe; a liquid supply connector, the liquid supply connector having a liquid supply end and a first liquid inlet end that are interconnected, the liquid supply end being connected to the coolant inlet of the battery, and the first liquid inlet end being connected to the liquid inlet pipe so that the coolant enters the battery through the first liquid inlet end and the liquid supply end; a liquid return connector, the liquid return connector having a liquid return end and a first liquid outlet end that are interconnected, the liquid return end being connected to the coolant outlet of the battery, and the first liquid outlet end being connected to the liquid return pipe so that the coolant in the battery is discharged into the liquid return pipe via the liquid return end and the first liquid outlet end; The liquid supply joint includes a first outer tube, a first inner tube and a first connecting tube; The first outer tube is connected to the liquid return tube, the first inner tube is located inside the first outer tube, the first inner tube is connected to the liquid inlet tube, one end of the first connecting tube passes through the tube wall of the first outer tube and is connected to the first inner tube, and the other end of the first connecting tube is connected to the liquid supply end.

2. The liquid cooling pipeline of the electric energy storage system according to claim 1, characterized in that: The liquid return joint includes a second outer tube and a second inner tube; The second outer tube is connected to the liquid return tube, the second inner tube is located inside the second outer tube, the second inner tube is connected to the liquid inlet tube, and the liquid return end is provided on the outer wall of the second outer tube and is connected to the channel between the second outer tube and the second inner tube.

3. The liquid cooling pipeline of the electric energy storage system according to claim 2, characterized in that: The liquid return pipe includes a first liquid return branch pipe and a second liquid return branch pipe, and the liquid inlet pipe includes a first liquid inlet branch pipe and a second liquid inlet branch pipe; One end of the first liquid inlet branch pipe is connected to one end of the first inner tube, and one end of the second liquid inlet branch pipe is connected to the other end of the first inner tube; One end of the first liquid return branch pipe is connected to one end of the first outer pipe, the first liquid inlet branch pipe is located in the first liquid return branch pipe, the other end of the first outer pipe is connected to one end of the second liquid return branch pipe, one end of the second outer pipe is connected to the other end of the second liquid return branch pipe, and the second liquid inlet branch pipe is located in the second liquid return branch pipe.

4. The liquid cooling pipeline of the electric energy storage system according to claim 3, characterized in that: Also included is a connecting joint having a liquid inlet pipeline and a liquid outlet pipeline; One end of the liquid inlet pipeline is connected to the other end of the first liquid inlet branch pipe, and one end of the liquid outlet pipeline is connected to the other end of the first liquid return branch pipe.

5. The liquid cooling pipeline of the electric energy storage system according to claim 4, characterized in that: The liquid outlet pipeline includes a third outer tube and a first pipe head, one end of the third outer tube is connected to the first liquid return branch pipe, and the other end of the third outer tube is connected to the first pipe head; The liquid inlet pipeline includes a second pipe head, a second connecting pipe and a third inner pipe. The third inner pipe is located in the third outer pipe. One end of the third inner pipe is connected to the other end of the first liquid inlet branch pipe. The second pipe head is communicated with the third outer pipe. One end of the second connecting pipe is connected to the other end of the third inner pipe. The other end of the second connecting pipe is connected to the second pipe head.

6. The liquid cooling pipeline of the electric energy storage system according to claim 5, characterized in that: The center line of the second connecting tube is perpendicular to the center line of the third inner tube, and the liquid supply joint, the liquid return joint and the second pipe head are oriented in the same direction.

7. The liquid cooling pipeline of the electric energy storage system according to claim 5, characterized in that: A plurality of connecting pieces are provided between the first inner tube and the first outer tube, between the second inner tube and the second outer tube, between the first liquid return branch pipe and the first liquid inlet branch pipe, and between the second liquid return branch pipe and the second liquid inlet branch pipe.

8. The liquid cooling pipeline of the electric energy storage system according to claim 3, characterized in that: It also includes a tail pipe, which includes a fourth outer tube, a fourth inner tube and a baffle, one end of the fourth outer tube is connected to the other end of the second outer tube, one end of the fourth inner tube is connected to the other end of the second inner tube, and the other end of the fourth outer tube and the other end of the fourth inner tube are both connected to the baffle.

9. The liquid cooling pipeline of the electric energy storage system according to claim 8, characterized in that: The inner wall of the first outer tube and the interior of the second outer tube are both provided with thermal fuses, the first outer tube is welded to the first liquid return branch pipe and the second liquid return branch pipe via the thermal fuses, and the second outer tube is welded to the second liquid return branch pipe and the fourth outer tube via the thermal fuses; A heat-melt joint is provided on the outer wall of the first outer tube and the outer wall of the second outer tube, and the first outer tube and the second outer tube are welded to the battery via the heat-melt joint.

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