Liquid cooling system and energy storage box

Abstract

The utility model provides a liquid cooling system and an energy storage box. An input pipeline of the liquid cooling system comprises a first-stage input pipeline and a second-stage input pipeline, wherein the first-stage input pipeline comprises a plurality of sections of first-stage input pipelines and a plurality of first three-way pipes; the first end of each first three-way pipe is connected with a first-stage input pipeline, and the second end of each first three-way pipe is connected with another first-stage input pipeline; each secondary input pipeline is connected to the third end; each secondary input pipeline comprises a plurality of sections of secondary input pipelines and a plurality of second three-way pipes; the first end of each second three-way pipe is connected with a second-stage input pipeline, and the second end of each second three-way pipe is connected with another second-stage input pipeline; each three-stage input pipeline is connected to the third end; in the flowing direction of the refrigerant in the second-stage input pipeline, the third ends of the multiple second three-way pipes connected to the same second-stage input pipeline have various inner diameters, and the farther the distance between the third ends and the first-stage input pipeline is, the smaller the inner diameter is. According to the liquid cooling system, the cooling liquid can be uniformly distributed, and the temperature stability of the battery system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage boxes, and in particular to a liquid cooling system and an energy storage box. Background Art

[0002] To ensure temperature control during the battery system's charge and discharge processes, liquid cooling systems are widely used in energy storage tanks. Liquid cooling systems circulate coolant to absorb and dissipate heat generated by the battery system. Evenly distributing the coolant within the system prevents localized overheating and is crucial for maintaining temperature stability. Utility Model Content

[0003] The embodiments of the present application provide a liquid cooling system and an energy storage box. The liquid cooling system can evenly distribute coolant and improve the temperature stability of the battery system.

[0004] In a first aspect, an embodiment of the present application provides a liquid cooling system, comprising an input pipeline and an output pipeline, wherein the input pipeline comprises:

[0005] A primary input pipeline for inputting refrigerant, the primary input pipeline comprising multiple sections of primary input pipelines and multiple first tees; a first end of each of the first tees is connected to the primary input pipeline, and a second end of each of the first tees is connected to another of the primary input pipelines;

[0006] Multiple secondary input pipelines, each of the secondary input pipelines is connected to the third end of the first tee, and each of the secondary input pipelines includes multiple sections of secondary input pipelines and multiple second tees; the first end of each second tee is connected to the secondary input pipeline, and the second end of each second tee is connected to another secondary input pipeline;

[0007] a plurality of tertiary input pipelines, each of the tertiary input pipelines being connected to the third end of the second tee pipe;

[0008] Among them, along the flow direction of the refrigerant in the secondary input pipeline, the third ends of the plurality of second three-way pipes connected to the same secondary input pipeline have various inner diameters, and the farther the distance from the primary input pipeline, the smaller the inner diameter.

[0009] In one embodiment, along the flow direction of the refrigerant in the secondary input pipeline, the inner diameters of the third ends of the plurality of second three-way pipes connected to the same secondary input pipeline gradually decrease.

[0010] In one embodiment, along the flow direction of the refrigerant in the primary input pipeline, the inner diameters of the third ends of the plurality of first three-way pipes connected to the same primary input pipeline gradually increase.

[0011] In one embodiment, each of the secondary input pipelines includes a first section and a second section, the first section and the second section extend in different directions, the first section is connected to the tertiary input pipeline, and the first section is connected to the primary input pipeline through the second section.

[0012] In one embodiment, the second section and the first section are perpendicular to each other, the second section is connected to the primary input pipeline in a bending manner, and the second section is connected to the first section in a bending manner.

[0013] In one embodiment, the output pipeline includes: a first-level output pipeline for outputting refrigerant, and along the direction of gravity, the first-level output pipeline is located above the first-level input pipeline; wherein each of the second-level input pipelines extends from the first-level input pipeline to the first-level output pipeline; along the direction of gravity, multiple third-level input pipelines are connected to the second-level input pipeline in sequence and at intervals.

[0014] In one embodiment, the primary output pipeline includes multiple sections of primary output pipelines and multiple third tees; the first end of each of the third tees is connected to the primary output pipeline, and the second end of each of the third tees is connected to another primary output pipeline; the output pipeline further includes: multiple secondary output pipelines, each of the secondary output pipelines is connected to the third end of the third tees, each of the secondary output pipelines includes multiple sections of secondary output pipelines and multiple fourth tees; the first end of each of the fourth tees is connected to the secondary output pipeline, and the second end of each of the fourth tees is connected to another secondary output pipeline; multiple tertiary output pipelines, each of the tertiary output pipelines is connected to the third end of the fourth tees, and each of the tertiary output pipelines is also connected to one of the tertiary input pipelines; wherein the inner diameters of the third ends of the multiple fourth tees are equal; or along the flow direction of the refrigerant in the secondary output pipeline, the inner diameters of the third ends of the multiple fourth tees connected to the same secondary output pipeline gradually decrease.

[0015] In one embodiment, the inner diameters of the third ends of the plurality of third tees are equal; or the inner diameters of the third ends of the plurality of third tees connected to the same primary output pipeline gradually increase along the flow direction of the refrigerant in the primary output pipeline.

[0016] In a first aspect, an embodiment of the present application provides a liquid cooling system including an input pipeline and an output pipeline, wherein the input pipeline includes:

[0017] A primary input pipeline for inputting refrigerant, the primary input pipeline comprising multiple sections of primary input pipelines and multiple first tees; a first end of each of the first tees is connected to the primary input pipeline, and a second end of each of the first tees is connected to another of the primary input pipelines;

[0018] Multiple secondary input pipelines, each of the secondary input pipelines is connected to the third end of the first tee, and each of the secondary input pipelines includes multiple sections of secondary input pipelines and multiple second tees; the first end of each second tee is connected to the secondary input pipeline, and the second end of each second tee is connected to another secondary input pipeline;

[0019] a plurality of tertiary input pipelines, each of the tertiary input pipelines being connected to the third end of the second tee pipe;

[0020] Wherein, along the flow direction of the refrigerant in the first pipeline, the inner diameters of the third ends of the plurality of first three-way pipes connected to the same first pipeline gradually increase.

[0021] In a third aspect, an embodiment of the present application provides an energy storage box, comprising:

[0022] battery systems; and

[0023] A liquid cooling system, wherein the liquid cooling system is a liquid cooling system as described in any one of the above items, and the liquid cooling system is connected to the battery system.

[0024] The first-level input pipeline of the input pipeline in the liquid cooling system of the embodiment of the present application includes multiple sections of first-level input pipelines and multiple first tees, each of which has three ports. The first end of the first tee is connected to a section of the first-level input pipeline, the second end is connected to another section of the first-level input pipeline, and the third end is used to connect to the second-level input pipeline. Therefore, the first tee plays the role of distributing refrigerant, distributing the refrigerant in the first-level input pipeline to different second-level input pipelines. The second-level input pipeline includes multiple sections of second-level input pipelines and multiple second tees, each of which has three ports. The first end of the second tee is connected to a section of the second-level input pipeline, the second end is connected to another section of the second-level input pipeline, and the third end is used to connect to the tertiary input pipeline. Therefore, the second tee also plays the role of distributing refrigerant, further distributing the refrigerant in the secondary pipeline to each tertiary input pipeline. The tertiary input pipeline is directly connected to the liquid cooling plate to provide cooling liquid for the battery pack. Furthermore, along the refrigerant flow direction within the secondary input line, the third ends of the multiple second tees connected to the same secondary input line have varying inner diameters, with the inner diameter decreasing as the distance from the primary input line increases. Different inner diameters can vary the cooling flow rate and flow rate. Tertiary input lines farther from the primary input line have shorter loops and lower pressure drops. Therefore, the third ends of the second tees connecting these tertiary input lines are designed to have smaller inner diameters to increase flow resistance and balance flow. Conversely, tertiary input lines closer to the primary input line have longer loops and greater pressure drops. To compensate for the varying pressure drops caused by these loop lengths, the third ends of the second tees connecting these tertiary input lines have larger inner diameters to reduce flow resistance and ensure adequate flow. This ensures that multiple tertiary input lines connected to the same secondary input line, regardless of their position within the secondary input line, receive a uniform flow of coolant, ensuring proper cooling for all battery packs. The liquid cooling system of the embodiment of the present application directly achieves the expected flow distribution by adjusting the inner diameter of the second three-way pipe, without the need for on-site debugging, thereby improving assembly efficiency, and avoiding the use of valves for flow regulation. There is no need to add additional interfaces or valve bodies, thereby reducing structural complexity and manufacturing costs. The simplified structure meets the layout requirements of the energy storage box in a space-constrained environment. Since movable parts such as valves are eliminated, problems such as valve loosening and wear that may occur during long-term operation are reduced, thereby reducing subsequent maintenance costs and workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of the liquid cooling pipeline structure of the liquid cooling system provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the structure of the first tee provided for the implementation of this application;

[0028] Figure 3 A schematic diagram of the structure of the second three-way pipe provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of the structure of the battery pack provided in an embodiment of the present application;

[0030] Figure 5 for Figure 1 Schematic diagram of the component structure of the liquid cooling pipeline shown;

[0031] Figure 6 for Figure 5 A partial enlarged view of part A in the component structure of the liquid cooling pipeline is shown. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0033] The energy storage box includes a battery system and a liquid cooling system. The battery system is the core of the energy storage box and is responsible for storing and releasing electrical energy. The battery system can include one or more battery cabinets, each of which can contain one or more battery packs. Each battery pack can include one or more battery modules, and each battery module can include one or more battery cells. The battery cell is the basis for building the battery system and the main source of heat.

[0034] The liquid cooling system is used to manage the heat generated by the battery system. The liquid cooling system includes a liquid cooling plate, liquid cooling pipes, and a liquid cooling unit. Please refer to Figures 1 to 6 , Figure 1 This is a schematic diagram of the liquid cooling pipeline structure of the liquid cooling system provided in an embodiment of the present application. Figure 2 The structural diagram of the first tee pipe provided for the implementation of this application, Figure 3 This is a schematic diagram of the structure of the second three-way pipe provided in an embodiment of the present application. Figure 4 A schematic diagram of the structure of the battery pack provided in an embodiment of the present application, Figure 5 for Figure 1 The schematic diagram of the component structure of the liquid cooling pipeline is shown in FIG. Figure 6 for Figure 5 A partial enlarged view of part A in the component structure of the liquid cooling pipeline is shown.

[0035] The number of liquid cooling plates matches the number of battery packs 40 in the energy storage box, ensuring that each battery pack 40 receives adequate cooling. Each liquid cooling plate is positioned beneath its corresponding battery pack 40, contacting the bottom of the battery cells to dissipate heat. The liquid cooling circuit 10 includes input lines 20 and output lines 30. The input line 20 comprises a primary input line 200, a secondary input line 300, and a tertiary input line 400. The corresponding output lines 30 also include a primary output line 500, a secondary output line 600, and a tertiary output line 700.

[0036] Among them, the first-level input pipeline 200 of the input pipeline is used to input coolant, and the first-level input pipeline 200 includes multiple sections of first-level input pipelines 210 and multiple first tees 220; the first end 221 of each first tee 220 is connected to the first-level input pipeline 210, and the second end 222 of each first tee 220 is connected to another first-level input pipeline 210; each of the second-level input pipelines 300 is connected to the third end 223 of the first tee 220, and each of the second-level input pipelines 300 includes multiple sections of second-level input pipelines 310 and multiple second tees 320; the first end 321 of each second tee 320 is connected to the secondary input pipeline 310, and the second end 322 of each second tee 320 is connected to another secondary input pipeline 310; each of the tertiary input pipelines 400 is connected to the third end 323 of the second tee 320.

[0037] Exemplarily, the first-level output pipeline 500 of the output pipeline 30 is used to output coolant, and along the direction of gravity, the first-level output pipeline 500 is located above the first-level input pipeline 200; wherein, each of the second-level input pipelines 300 extends from the first-level input pipeline 200 to the first-level output pipeline 500; along the direction of gravity, multiple third-level input pipelines 400 are connected to the second-level input pipeline 300 in sequence and at intervals.

[0038] Among them, the primary input line 200 can be the main liquid inlet pipe, and the primary output line 500 can be the main liquid outlet pipe. The primary input line 200 and the primary output line 500 are the main channels of the liquid cooling system, responsible for transporting the coolant from the liquid cooling unit to each battery pack 40, and collecting the heated coolant and returning it to the liquid cooling unit. Among them, the liquid cooling unit includes refrigeration equipment, pumps, heat exchangers, etc., which are responsible for the circulation, cooling and recycling of the coolant. The secondary input line 300 can be the liquid inlet branch of the battery cabinet, and the secondary output line 600 can be the liquid outlet branch of the battery cabinet. All secondary input lines 300 are connected in parallel to the primary input line 200, and all secondary output lines 600 are connected in parallel to the primary output line 500, so that the coolant in the primary input line 200 can be distributed to all battery cabinets, and the heated coolant collected by all battery cabinets can be returned to the liquid cooling unit from the primary output line 500. The tertiary input pipeline 400 can be the liquid inlet branch of the battery pack 40, and the tertiary output pipeline 700 can be the liquid outlet branch of the battery pack 40. All the tertiary input pipelines 400 of a single battery cabinet are connected in parallel to the secondary input pipeline 300, and all the tertiary output pipelines 700 of a single battery cabinet are connected in parallel to the secondary output pipeline 600 to ensure that the coolant in the secondary input pipeline 300 can be distributed to all the battery packs 40 in the battery cabinet, and the heated coolant of all the battery packs 40 in the battery cabinet can reach the secondary output pipeline 600. A liquid cooling plate is provided at the bottom of each battery pack 40. The liquid inlet of each liquid cooling plate is connected to the tertiary input pipeline 400, and the liquid outlet of each liquid cooling plate is connected to the tertiary output pipeline 700. Thus, the cooling liquid of the tertiary input pipeline 400 can be input from the liquid inlet of the liquid cooling plate. When flowing through the liquid cooling plate, it can absorb the heat generated by each battery module in the battery pack 40. The heated cooling liquid can be transported from the liquid outlet of the liquid cooling plate to the tertiary output pipeline 700.

[0039] The entire liquid cooling system forms a closed-loop circulation network. Coolant flows from the cooling unit into the primary input line 200. It is then distributed to the inlets of each cooling plate through the secondary input line 300 and the tertiary input line 400. Within the cooling plate, the coolant absorbs heat generated by the battery modules. The heated coolant then flows out of the cooling plate's outlet and returns to the primary output line 500 through the tertiary output line 700 and the secondary output line 600. The coolant then returns to the cooling unit, releasing heat in the heat exchanger and being recooled. The coolant then recirculates and continues to cool the energy storage tank.

[0040] In the liquid cooling system of this embodiment, since the first-level output pipeline 500 of the output pipeline is located above the first-level input pipeline 200, and the multiple tertiary input pipelines 400 are connected to the secondary input pipeline 300 in sequence and at intervals along the direction of gravity, the flow direction of the coolant in the secondary input pipeline 300 is from bottom to top, and when the coolant flows in the secondary input pipeline 300, it also flows from bottom to top into the tertiary input pipelines 400 at different heights.

[0041] Specifically, the first-level input pipeline 200 of the input pipeline in this embodiment includes multiple sections of first-level input pipelines 210 and multiple first tees 220. Each first tee 220 has three ports. The first end 221 of the first tee 220 is connected to a section of the first-level input pipeline 210, the second end 222 is connected to another section of the first-level input pipeline 210, and the third end 223 is used to connect to the secondary input pipeline 300. Therefore, the first tee 220 plays a role in distributing coolant, distributing the coolant in the first-level input pipeline 200 to different secondary input pipelines 300. The secondary input pipeline 300 comprises multiple sections of secondary input pipelines 310 and multiple second tees 320. Each second tee 320 has three ports: a first end 321 of the second tees 320 connects to one section of the secondary input pipeline 310, a second end 322 connects to another section of the secondary input pipeline 310, and a third end 323 connects to the tertiary input pipeline 400. Therefore, the second tees 320 also function as a coolant distributor, distributing coolant from the secondary pipelines to each of the tertiary input pipelines 400. The tertiary input pipeline 400 is directly connected to the liquid cooling plate to provide coolant to the battery pack 40. Furthermore, along the direction of coolant flow within the secondary input pipeline 300, the third ends 323 of the multiple second tees 320 connected to the same secondary input pipeline 300 have varying inner diameters, with the inner diameter decreasing as the distance from the primary input pipeline 200 increases.

[0042] Among them, for multiple tertiary input pipelines 400 connected to the same secondary input pipeline 300, the upper tertiary input pipeline 400 is farther away from the primary input pipeline 200, but closer to the primary output pipeline 500, while the lower tertiary input pipeline 400 is closer to the primary input pipeline 200, but farther away from the primary output pipeline 500. Therefore, the tertiary input pipeline 400 that is farther away from the primary input pipeline 200 has a shorter loop. Here, the loop refers to: the coolant flows into the tertiary input pipeline 400, passes through the liquid cooling plate, and then flows out to the corresponding tertiary output pipeline 700, converges into the secondary output pipeline 600, returns to the primary output pipeline and returns to the liquid cooling unit.

[0043] It will be appreciated that different inner diameters can alter the cooling flow rate and flow rate. Tertiary input lines 400 that are farther from the primary input line 200 have shorter loops and lower pressure drops. Therefore, the third ends 323 of the second three-way pipes 320 connecting these tertiary input lines 400 are designed to have smaller inner diameters to increase flow resistance and balance flow. Conversely, tertiary input lines 400 that are closer to the primary input line 200 have longer loops and greater pressure drops. To compensate for the varying pressure drops caused by these loop length differences, the third ends 323 of the second three-way pipes 320 connecting these tertiary input lines 400 can have larger inner diameters to reduce flow resistance and ensure sufficient flow. This ensures that multiple tertiary input lines 400 connected to the same secondary input line 300, regardless of their position within the secondary input line, receive a uniform flow of coolant, thereby ensuring that all battery packs 40 receive adequate cooling.

[0044] For example, the inner diameters of the multiple second tees 320 connected to the same secondary input pipeline 300 can be adjusted in sections. Specifically, the multiple second tees 320 can be divided into two sections, with the third ends 323 of the second tees 320 located closer to the primary input pipeline 200 having a larger inner diameter. Conversely, the third ends 323 of the second tees 320 located farther from the primary input pipeline 200 have a smaller inner diameter. Another example, the inner diameters of the multiple second tees 320 connected to the same secondary input pipeline 300 can be adjusted in groups. Specifically, the multiple second tees 320 can be grouped, with the third ends 323 of the second tees 320 located closer to the primary input pipeline 200 having a larger inner diameter. The third ends 323 of the second tees 320 located farther from the primary input pipeline 200 having a smaller inner diameter. This segmented or grouped inner diameter adjustment can balance the flow rates of the tertiary input pipeline 400 at different locations to a certain extent.

[0045] In another exemplary embodiment, along the flow direction of the coolant in the secondary input pipeline 300, the inner diameters of the third ends 323 of the plurality of second three-way pipes 320 connected to the same secondary input pipeline 300 gradually decrease. That is, in this embodiment, the inner diameter of the third end 323 of each second three-way pipe 320 can be adjusted. As the coolant flows upward, the loop of the tertiary input pipeline 400 gradually becomes shorter, the pressure drop gradually decreases, and the inner diameter of the third end 323 of the corresponding second three-way pipe 320 gradually decreases to balance the flow. Through this design of gradually decreasing inner diameter, the loop and pressure drop of each tertiary input pipeline 400 can be effectively taken into account, the flow of each tertiary input pipeline 400 can be better balanced, and all battery packs 400 can be better ensured to obtain proper cooling, avoiding local overheating or insufficient cooling, thereby improving the overall performance and reliability of the liquid cooling system.

[0046] For example, in this embodiment, the inner diameter of the third end 323 of each second three-way pipe 320 can be adjusted to meet flow control requirements while maintaining the same first end 321 and second end of each second three-way pipe 320, thereby simplifying the design and manufacture of the second three-way pipe 320 in the input pipeline. Of course, the inner diameters of the first end 321 and second end 322 of each second three-way pipe 320 can also be adjusted based on actual flow deviations, which is not limited in this embodiment.

[0047] In practical applications, computational fluid dynamics software or other simulation tools can be used during the design phase to simulate the flow of coolant in different pipelines to determine the optimal inner diameter of each second tee 320. Based on the simulation results, the size of the second tee 320 is precisely controlled during the manufacturing phase to ensure that the inner diameter of each pipe meets the design requirements. After assembly is completed, since the inner diameter of each second tee 320 has been optimized based on the simulation results, the expected flow distribution can be directly achieved without the need for on-site debugging, thereby improving assembly efficiency and avoiding the use of valves for flow regulation. There is no need to add additional interfaces or valve bodies, thereby reducing structural complexity and manufacturing costs. The simplified structure meets the layout requirements of the energy storage box in a space-constrained environment. Since movable parts such as valves are eliminated, problems such as valve loosening and wear that may occur during long-term operation are reduced, thereby reducing later maintenance costs and workload.

[0048] In one embodiment, the inner diameters of the third ends 223 of the multiple first tees 220 connected to the same primary input line 200 gradually increase along the flow direction of the coolant within the primary input line 200. This embodiment can further adjust the inner diameter of the third ends 223 of the first tees 220 to balance the flow distribution within the liquid cooling system. Multiple secondary input lines 300 are connected in parallel to the primary input line 200 via corresponding first tees 220. The closer a secondary input line 300 is to the inlet of the primary input line 200, the closer its corresponding secondary output line 600 is to the outlet of the primary output line 500, thus shortening the corresponding loop. The farther a secondary input line 300 is from the inlet of the primary input line 200, the farther its corresponding secondary output line 600 is from the outlet of the primary output line 500, thus lengthening the corresponding loop.

[0049] As can be understood, since the secondary input lines 300 near the entrance of the primary input line 200 have shorter loops and lower pressure drops, the inner diameter of the third end 223 of the first tee pipe 220 connecting these secondary input lines 300 is designed to be smaller to increase flow resistance and balance flow. Conversely, as the coolant flows downstream of the primary input line 200, the loop gradually becomes longer and the pressure drop increases. Accordingly, the inner diameter of the third end 223 of the first tee pipe 220 connecting these secondary input lines 300 is designed to be larger to reduce flow resistance and ensure sufficient flow. This gradually increasing flow design balances the flow to each secondary input line 300, regardless of its position on the primary input line 200, thereby ensuring that all battery cabinets receive a uniform coolant flow.

[0050] This embodiment allows adjustment of the inner diameter of the third end 323 of each second three-way pipe 320, and also allows adjustment of the inner diameter of the third end 323 of each first three-way pipe 220, thereby evenly distributing the coolant flow from the primary input pipeline 200 to each secondary input pipeline 300, and evenly distributing the coolant flow from the secondary input pipeline 300 to each tertiary input pipeline 400, thereby ensuring that all battery packs 40 on the battery cabinet are properly cooled. This design effectively avoids the problem of local overheating or insufficient cooling caused by uneven flow distribution in the liquid cooling system.

[0051] For example, in this embodiment, the inner diameter of the third end 223 of each first three-way pipe 220 can be adjusted to meet flow control requirements while maintaining the same first end 221 and second end of each first three-way pipe 220, thereby simplifying the design and manufacture of the first three-way pipe 220 in the input pipeline. Of course, the inner diameters of the first end 221 and second end 222 of each first three-way pipe 220 can also be adjusted based on actual flow deviation, which is not limited in this embodiment.

[0052] In practical applications, computational fluid dynamics software or other simulation tools can also be used during the design phase to simulate the flow of coolant in different pipelines to determine the optimal inner diameter of each first tee pipe 220. Based on the simulation results, the size of the first tee pipe 220 is precisely controlled during the manufacturing phase to ensure that the inner diameter of each pipe meets the design requirements. After assembly is completed, since the inner diameter of each first tee pipe 220 has been optimized based on the simulation results, the expected flow distribution can be directly achieved.

[0053] In one embodiment, each of the secondary input pipelines 300 includes a first section 330 and a second section 340 , wherein the first section 330 and the second section 340 extend in different directions, the first section 330 is connected to the tertiary input pipeline 400 , and the first section 330 is connected to the primary input pipeline 200 through the second section 340 .

[0054] Exemplarily, the second section 340 is perpendicular to the first section 330, and the second section 340 is connected to the primary input pipeline 200 in a zigzag manner. The second section 340 is also connected to the first section 330 in a zigzag manner. It is understood that the first section 330 and the second section 340 can extend in different directions. For example, the first section 330 and the second section 340 can be perpendicular to each other. The vertical arrangement of the first section 330 and the second section 340 can more efficiently utilize space, helping to achieve a better pipeline layout within the limited space of the energy storage box. In addition, the zigzag design of the first section 330 and the second section 340 also helps to provide a certain buffering effect when the flow rate changes, thereby preventing the impact of coolant flow fluctuations on the tertiary input pipeline 400.

[0055] In one embodiment, the primary output pipeline 500 includes multiple sections of primary output pipelines 510 and multiple third tees 520; the first end 521 of each third tee 520 is connected to the primary output pipeline 510, and the second end 522 of each third tee 520 is connected to another primary output pipeline 510; each secondary output pipeline 600 is connected to the third end 523 of the third tee 520, and each secondary output pipeline 600 includes multiple sections of secondary output pipelines 610 and multiple fourth tees 620; the first end 621 of each fourth tee 620 is connected to the The secondary output pipeline 610, the second end 622 of each fourth three-way pipe 620 is connected to another secondary output pipeline 610; each tertiary output pipeline 700 is connected to the third end 623 of the fourth three-way pipe 620, and each tertiary output pipeline 700 is also connected to a tertiary input pipeline 400; wherein, the inner diameters of the third ends 623 of the plurality of fourth three-way pipes 620 are equal; or along the flow direction of the coolant in the secondary output pipeline 600, the inner diameters of the third ends 623 of the plurality of fourth three-way pipes 620 connected to the same secondary output pipeline 600 gradually decrease.

[0056] Among them, the output pipeline 30 can be designed to correspond to the input pipeline 20. Specifically, the first-level output pipeline 500 includes multiple sections of first-level output pipelines 510 and multiple third tees 520. Each third tee 520 has three ports. The first end 521 of the third tee 520 is connected to the section of the first-level output pipeline 510, and the other end is connected to another section of the first-level output pipeline 510. The third end 523 is used to connect to the second-level output pipeline 600. Therefore, the coolant output from the second-level output pipeline 600 is returned to the first-level output pipeline 500 through the third tee 520. The secondary output pipeline 600 also includes multiple sections of secondary output pipelines 610 and multiple fourth three-way pipes 620. The fourth three-way pipe 620 also includes three ports. The first end 621 of the fourth three-way pipe 620 is connected to one section of the secondary output pipeline 610, the second end 622 is connected to another of the secondary output pipelines 610, and the third end 623 is connected to the tertiary output pipeline 700. Therefore, the coolant output from the tertiary output pipeline 700 can be returned to the secondary output pipeline 600 through the fourth three-way pipe 620, so as to ensure that the coolant can effectively flow through the tertiary output pipeline 700, the secondary output pipeline 600 and the primary output pipeline 500, and return to the liquid cooling unit.

[0057] For example, this embodiment takes into account that the multiple tertiary output pipelines 700 connected to the same secondary output pipeline 600 are closer to the primary output pipeline 500 at the top, and farther away from the primary output pipeline 500 at the bottom. Therefore, along the flow direction of the coolant in the secondary output pipeline 600, that is, the closer the multiple tertiary output pipelines 700 connected to the same secondary output pipeline 600 are to the primary output pipeline 500, the shorter the corresponding loop is and the smaller the pressure drop is. Therefore, the inner diameter of the third end 623 of the fourth three-way pipe 620 is designed to gradually decrease. On the contrary, the farther the tertiary output pipeline 700 is from the primary output pipeline 500, the longer the corresponding loop is and the greater the pressure drop is. Therefore, the inner diameter of the third end 623 of the fourth three-way pipe 620 is designed to gradually increase, thereby ensuring that even if the loop lengths of each tertiary output pipeline 700 are different, the flow rate returning to the secondary output pipeline 600 is uniform, maintaining the stability of the liquid cooling system to adapt to various possible flow and pressure drop conditions of the coolant during the flow process.

[0058] In another example, the inner diameters of the third ends 623 of each of the fourth three-way pipes 620 may also be equal, thereby simplifying the design and manufacture of the fourth three-way pipes 620 in the output pipeline.

[0059] For example, in this embodiment, the inner diameter of the third end 623 of each fourth three-way pipe 620 can be adjusted to meet flow control requirements, while maintaining the same first end 621 and second end 622 of each fourth three-way pipe 620, thereby simplifying the design and manufacture of the first three-way pipe 220 in the input pipeline. Of course, the inner diameters of the first end 621 and second end of each fourth three-way pipe 620 can also be adjusted based on actual flow deviation, which is not limited in this embodiment.

[0060] In one embodiment, the inner diameters of the third ends 523 of the plurality of third three-way pipes 520 are equal; or the inner diameters of the third ends 523 of the plurality of third three-way pipes 520 connected to the same first-level output pipeline 500 gradually increase along the flow direction of the coolant in the first-level output pipeline 500.

[0061] It will be appreciated that, along the direction of coolant flow within the primary output pipe 500, that is, as the secondary output pipe 600 approaches the outlet of the primary output pipe, its corresponding loop gradually shortens, its pressure drop gradually decreases, and the corresponding inner diameter of the third end 523 of the third tee pipe 520 gradually decreases. Conversely, as the secondary output pipe 600 moves further away from the outlet of the primary output pipe, its corresponding loop gradually lengthens, its pressure drop gradually increases, and the corresponding inner diameter of the third end 523 of the third tee pipe 520 gradually decreases. This ensures that even if the loop lengths of the secondary output pipes 600 vary, the flow rate returning to the primary output pipe 500 is uniform, further ensuring the stability of the liquid cooling system and adapting to various possible coolant flow and pressure drop conditions during the flow process, thereby improving the overall performance and reliability of the liquid cooling system.

[0062] In another example, the inner diameters of the third ends 523 of the plurality of third three-way pipes 520 are equal, thereby simplifying the design and manufacture of the third three-way pipes 520 in the output pipeline.

[0063] For example, in this embodiment, the inner diameter of each third three-way pipe 520 can be adjusted to meet flow control requirements while maintaining the same first end 521 and second end 522 of each third three-way pipe 520, thereby simplifying the design and manufacture of the third three-way pipe 520 in the input pipeline. Of course, the inner diameters of the first end 521 and second end 522 of each third three-way pipe 520 can also be adjusted based on actual flow deviations, which is not limited in this embodiment.

[0064] In practical applications, computational fluid dynamics software or other simulation tools can also be used during the design phase to simulate the flow of coolant in different pipelines to determine the optimal inner diameter of each third tee 520 and / or fourth tee 620. Based on the simulation results, the dimensions of the third tee 520 and / or fourth tee 620 are precisely controlled during the manufacturing phase to ensure that the inner diameter of each pipe meets the design requirements. After assembly is completed, since the inner diameter of each third tee 520 and / or fourth tee 620 has been optimized based on the simulation results, the expected uniform flow reflux can be directly achieved.

[0065] The embodiment of the present application also provides a liquid cooling system, including an input pipeline and an output pipeline, wherein the input pipeline includes: a primary input pipeline 200 for inputting cooling liquid, the primary input pipeline 200 includes multiple sections of primary input pipelines 210 and multiple first tee pipes 220; the first end 221 of each first tee pipe 220 is connected to the primary input pipeline 210, and the second end 222 of each first tee pipe 220 is connected to another primary input pipeline 210; multiple secondary input pipelines 300, each of the secondary input pipelines 300 is connected to the third end 223 of the first tee pipe 220, and each The secondary input pipeline 300 includes multiple sections of secondary input pipelines 310 and multiple second tees 320; the first end 321 of each second tees 320 is connected to the secondary input pipeline 310, and the second end 322 of each second tees 320 is connected to another secondary input pipeline 310; multiple tertiary input pipelines 400, each of the tertiary input pipelines 400 is connected to the third end 323 of the second tees 320; wherein, along the flow direction of the coolant in the first pipeline, the inner diameter of the third ends 223 of the multiple first tees 220 connected to the same first pipeline gradually increases.

[0066] The overall structure of the liquid cooling system is described above and will not be elaborated upon here. The difference is that the liquid cooling system of this embodiment can only adjust the inner diameter of the third end 223 of the first three-way pipe 220 to evenly distribute the coolant flow from the primary input pipeline 200 to each of the secondary input pipelines 300. As will be appreciated, since the secondary input pipelines 300 near the entrance of the primary input pipeline 200 have a shorter loop and a lower pressure drop, the inner diameter of the third end 223 of the first three-way pipe 220 connecting these secondary input pipelines 300 is designed to be smaller to increase flow resistance and balance flow. Conversely, as the coolant flows downstream of the primary input pipeline 200, the loop gradually lengthens and the pressure drop increases. Accordingly, the inner diameter of the third end 223 of the first three-way pipe 220 connecting these secondary input pipelines 300 can be designed to be larger to reduce flow resistance and ensure sufficient flow. Through this design of gradually increasing flow, the flow to each secondary input pipeline 300 can be balanced. In this way, even if the secondary input pipeline 300 far away from the inlet of the primary input pipeline 200 has a longer loop and a larger pressure drop, a uniform flow can be obtained, so that each battery cabinet can obtain sufficient uniform coolant flow to cool the multiple battery packs 40 on the battery cabinet.

[0067] It should be noted that the liquid cooling system of the present embodiment can evenly distribute the coolant flow from the secondary input line 300 to each of the tertiary input lines 400 by adjusting only the inner diameter of the third end 323 of the second tee 320, or evenly distribute the coolant flow from the primary input line 200 to each of the secondary input lines 300 by adjusting only the inner diameter of the third end 223 of the first tee 220, thereby improving the ability of the liquid cooling system to evenly distribute coolant. Alternatively, the inner diameters of the third end 323 of the second tee 320 and the third end 223 of the first tee 220 can be adjusted simultaneously to evenly distribute the coolant flow from the primary input line 200 to each of the secondary input lines 300 and evenly distribute the coolant flow from the secondary input line 300 to each of the tertiary input lines 400, thereby better ensuring that all battery packs 40 in the battery cabinet of the battery system are properly cooled.

[0068] An embodiment of the present application also provides an energy storage box, including a battery system and a liquid cooling system, wherein the liquid cooling system is such as the liquid cooling system described in any one of the above items, and the liquid cooling system is connected to the battery system. The connection method between the liquid cooling system and the battery system can refer to the above description and will not be repeated here. The liquid cooling system absorbs and transfers the heat generated by the battery system during the charging and discharging process by circulating coolant, ensuring that the temperature of each battery pack 40 remains within a safe and optimal operating range. Moreover, the liquid cooling system of this embodiment can evenly distribute the coolant by adjusting the inner diameter of each tee pipe in the pipeline, which helps to reduce the temperature difference between different battery packs 40 in the battery system, avoid local overheating, and thus improve the thermal stability and reliability of the entire battery system. Moreover, the liquid cooling system of the energy storage box achieves the expected flow distribution by adjusting the inner diameter of each tee pipe, without the need for on-site debugging, which improves assembly efficiency and avoids the use of valves for flow regulation. There is no need to add additional interfaces or valve bodies, thereby reducing structural complexity and manufacturing costs. The simplified structure meets the layout requirements of the energy storage box in a space-constrained environment. Since movable parts such as valves are eliminated, problems such as valve loosening and wear that may occur during long-term operation are reduced, thereby reducing the later maintenance cost and workload of the energy storage box.

[0069] The embodiments of the present application provide a detailed introduction to the liquid cooling system and the energy storage box. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A liquid cooling system, characterized in that: It includes an input pipeline and an output pipeline, wherein the input pipeline includes: A primary input pipeline for inputting refrigerant, the primary input pipeline comprising multiple sections of primary input pipelines and multiple first tees; a first end of each of the first tees is connected to the primary input pipeline, and a second end of each of the first tees is connected to another of the primary input pipelines; Multiple secondary input pipelines, each of the secondary input pipelines is connected to the third end of the first tee, and each of the secondary input pipelines includes multiple sections of secondary input pipelines and multiple second tees; the first end of each second tee is connected to the secondary input pipeline, and the second end of each second tee is connected to another secondary input pipeline; a plurality of tertiary input pipelines, each of the tertiary input pipelines being connected to the third end of the second tee pipe; Among them, along the flow direction of the refrigerant in the secondary input pipeline, the third ends of the plurality of second three-way pipes connected to the same secondary input pipeline have various inner diameters, and the farther the distance from the primary input pipeline, the smaller the inner diameter.

2. The liquid cooling system according to claim 1, characterized in that Along the flow direction of the refrigerant in the secondary input pipeline, the inner diameters of the third ends of the plurality of second three-way pipes connected to the same secondary input pipeline gradually decrease.

3. The liquid cooling system according to claim 1, characterized in that: Along the flow direction of the refrigerant in the primary input pipeline, the inner diameters of the third ends of the plurality of first three-way pipes connected to the same primary input pipeline gradually increase.

4. The liquid cooling system according to claim 1, wherein: Each of the secondary input pipelines includes a first section and a second section, the first section and the second section extend in different directions, the first section is connected to the tertiary input pipeline, and the first section is connected to the primary input pipeline through the second section.

5. The liquid cooling system according to claim 4, characterized in that: The second section is perpendicular to the first section, the second section is connected to the primary input pipeline in a bending manner, and the second section is connected to the first section in a bending manner.

6. The liquid cooling system according to any one of claims 1 to 5, characterized in that: The output pipeline includes: A primary output pipeline, for outputting refrigerant, wherein the primary output pipeline is located above the primary input pipeline along the direction of gravity; Each of the secondary input pipelines is extended from the primary input pipeline to the primary output pipeline; and along the gravity direction, a plurality of the tertiary input pipelines are sequentially connected to the secondary input pipeline at intervals.

7. The liquid cooling system according to claim 6, characterized in that: The primary output pipeline includes multiple sections of primary output pipelines and multiple third tees; the first end of each third tees is connected to the primary output pipeline, and the second end of each third tees is connected to another primary output pipeline; The output pipeline also includes: a plurality of secondary output pipelines, each of the secondary output pipelines being connected to the third end of the third tee, each of the secondary output pipelines comprising multiple sections of secondary output pipelines and a plurality of fourth tees; a first end of each fourth tees being connected to the secondary output pipeline, and a second end of each fourth tees being connected to another secondary output pipeline; a plurality of tertiary output pipelines, each of the tertiary output pipelines being connected to the third end of the fourth three-way pipe, and each of the tertiary output pipelines being further connected to a tertiary input pipeline; wherein the inner diameters of the third ends of the plurality of fourth three-way pipes are equal; or Along the flow direction of the refrigerant in the secondary output pipeline, the inner diameters of the third ends of the plurality of fourth three-way pipes connected to the same secondary output pipeline gradually decrease.

8. The liquid cooling system according to claim 7, characterized in that: The inner diameters of the third ends of the plurality of third tees are equal; or Along the flow direction of the refrigerant in the primary output pipeline, the inner diameters of the third ends of the plurality of third three-way pipes connected to the same primary output pipeline gradually increase.

9. A liquid cooling system, characterized in that: It includes an input pipeline and an output pipeline, wherein the input pipeline includes: A primary input pipeline for inputting refrigerant, the primary input pipeline comprising multiple sections of primary input pipelines and multiple first tees; a first end of each of the first tees is connected to the primary input pipeline, and a second end of each of the first tees is connected to another of the primary input pipelines; Multiple secondary input pipelines, each of the secondary input pipelines is connected to the third end of the first tee, and each of the secondary input pipelines includes multiple sections of secondary input pipelines and multiple second tees; the first end of each second tee is connected to the secondary input pipeline, and the second end of each second tee is connected to another secondary input pipeline; a plurality of tertiary input pipelines, each of the tertiary input pipelines being connected to the third end of the second tee pipe; Wherein, along the flow direction of the refrigerant in the first pipeline, the inner diameters of the third ends of the plurality of first three-way pipes connected to the same first pipeline gradually increase.

10. An energy storage box, characterized in that: include: Battery system; as well as A liquid cooling system, wherein the liquid cooling system is the liquid cooling system according to any one of claims 1 to 9, and the liquid cooling system is connected to the battery system.

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