Cascaded liquid cooling pipeline, liquid cooling system and high-pressure cascaded energy storage system

Abstract

The embodiment of the utility model provides a cascade liquid cooling pipeline, a liquid cooling system and a high-pressure cascade energy storage system. The cascade liquid cooling pipeline comprises a low-pressure pipeline (11) and a high-pressure pipeline (12), the low-pressure pipeline (11) is arranged in a low-pressure area of a battery cabin of the energy storage system, one end of the low-pressure pipeline (11) is used for being connected with a water chilling unit (3) of the energy storage system, and the other end of the low-pressure pipeline (11) is connected with the high-pressure pipeline (12) so as to communicate the water chilling unit (3) with the high-pressure pipeline (12); the high-pressure pipeline (12) is arranged in a high-pressure area of the battery cabin and is connected with a liquid cooling channel (2) arranged on a battery pack in the battery cabin so as to communicate the low-pressure pipeline (11) with the liquid cooling channel (2); the high-pressure pipeline (12) comprises multiple stages of pipelines, and the diameters of the multiple stages of pipelines are reduced step by step; and the low-pressure pipeline (11) and the high-pressure pipeline (12) are used for transporting cooling liquid so as to carry out liquid cooling treatment on the battery pack in the battery cabin. The cascade liquid cooling pipeline improves the temperature stability of the battery pack.

Description

Technical Field

[0001] This application relates to the field of thermal management technology for high-voltage energy storage devices, and in particular to a cascaded liquid cooling pipeline, a liquid cooling system, and a high-voltage cascaded energy storage system. Background Technology

[0002] Energy storage systems can be categorized into two main technical systems based on the power transmission path: low-voltage boost technology and high-voltage cascade technology. High-voltage cascade energy storage systems, with their advantages of high efficiency and high safety, have become the mainstream technology choice and development direction in the current energy storage field. During normal charging and discharging, the battery packs in an energy storage system generate a significant amount of heat. Therefore, cryogenic coolant is delivered to the liquid cooling plates of each battery pack through liquid cooling pipelines to control the battery pack temperature.

[0003] Currently, liquid cooling pipelines typically use a central return water system, where water flows along the pipeline to various parts that require cooling, carrying away heat before flowing back to the cooling device of the liquid cooling system through the return water end for further cooling, and then is recycled.

[0004] However, the method of returning water in the middle will affect the flow distribution and pressure of the coolant in the pipeline, thus affecting the cooling effect. Utility Model Content

[0005] This application provides cascaded liquid cooling pipelines, a liquid cooling system, and a high-voltage cascaded energy storage system to reduce the temperature of the battery pack, avoid excessive temperature differences between the individual battery packs, and improve the temperature stability of the battery pack.

[0006] In a first aspect, embodiments of this application provide a cascaded liquid cooling pipeline, the cascaded liquid cooling pipeline comprising: a low-pressure pipeline (11) and a high-pressure pipeline (12).

[0007] The low-pressure pipeline (11) is deployed in the low-pressure area of ​​the battery compartment of the energy storage system. One end of the low-pressure pipeline (11) is used to connect to the chiller unit (3) of the energy storage system, and the other end is connected to the high-pressure pipeline (12) to connect the chiller unit (3) and the high-pressure pipeline (12).

[0008] The high-pressure pipeline (12) is deployed in the high-pressure area of ​​the battery compartment and is used to connect with the liquid cooling channel (2) deployed on the battery pack in the battery compartment to connect the low-pressure pipeline (11) and the liquid cooling channel (2).

[0009] The high-pressure pipeline (12) includes a multi-stage pipeline, the diameter of which decreases progressively.

[0010] The low-pressure pipeline (11) and the high-pressure pipeline (12) are used to transport coolant for liquid cooling of the battery pack in the battery compartment.

[0011] In one possible implementation, the low-pressure pipeline (11) is an aluminum alloy pipe or a stainless steel pipe, and the low-pressure pipeline (11) is a corrugated pipe with an outer braided layer.

[0012] The high-pressure pipeline (12) is made of a high-insulation non-metallic material.

[0013] In one possible implementation, the high-pressure line (12) includes a first high-pressure line (121) and a second high-pressure line (122).

[0014] The first high-pressure pipeline (121) is connected to the low-pressure pipeline (11) through the first connector (123) and to the second high-pressure pipeline (122) through the second connector (124) to connect the low-pressure pipeline (11) and the second high-pressure pipeline (122). The diameter of the first high-pressure pipeline (121) is larger than that of the second high-pressure pipeline (122).

[0015] The first connector (123) includes a non-metallic part (1231) and a metallic part (1232). The non-metallic part (1231) is connected to the low-pressure pipeline (11), and the metallic part (1232) is connected to the first high-pressure pipeline (121).

[0016] The second high-pressure pipeline (122) is deployed on the battery cluster rack inside the battery compartment to connect the first high-pressure pipeline (121) and the liquid cooling channel (2).

[0017] In one possible implementation, electrode needles (125) are uniformly deployed axially on the first high-voltage pipeline (121), and the electrode needles (125) are connected to the ground via a grounding wire for monitoring potential fluctuations.

[0018] In one possible implementation, the first high-pressure pipeline (121) includes multiple battery compartment internal pipelines (1211), which are connected to each other by quick-connect springs or swivel joints, wherein the quick-connect springs are made of plastic.

[0019] In one possible implementation, the battery cluster rack includes a vertical portion and a horizontal portion; the second high-voltage pipeline (122) includes a main pipeline (1221) and branch pipelines (1222).

[0020] The main pipeline (1221) is deployed on the vertical part of the battery cluster rack. One end is connected to the first high-voltage pipeline (121), and the other end is connected to the branch pipeline (1222) through a third connector (1223) to connect the first high-voltage pipeline (121) and the branch pipeline (1222). The diameter of the main pipeline (1221) is larger than the diameter of the branch pipeline (1222).

[0021] The branch pipe (1222) is deployed on the horizontal part of the battery cluster rack and is connected to the liquid cooling channel (2) to connect the main pipe (1221) and the liquid cooling channel (2).

[0022] In one possible implementation, the main pipeline (1221) includes a plurality of sub-main pipelines (1221A), and the branch pipeline (1222) includes a plurality of sub-branch pipelines (1222A).

[0023] For any two of the plurality of sub-main pipelines (1221A), the two sub-main pipelines (1221A) are respectively connected to the first port and the second port of the third connector (1223);

[0024] The third port of the third connector is connected to any one of the plurality of sub-branch pipes (1222A).

[0025] In one possible implementation, the branch pipe (1222) includes an inlet branch pipe (1222B) and an outlet branch pipe (1222C).

[0026] The water inlet branch pipe (1222B) is connected at one end to the main pipeline (1221) via the third connector (1223) and at the other end to the liquid cooling channel (2), for conveying the coolant into the liquid cooling channel (2);

[0027] The outlet branch pipe (1222C) is connected at one end to the main pipeline (1221) via the third connector (1223) and at the other end to the liquid cooling channel (2), and is used to transport the coolant to the outlet pipe of the main pipeline (1221).

[0028] Secondly, embodiments of this application provide a liquid cooling system, including: a chiller unit (3), and cascaded liquid cooling pipelines as described in the first aspect and / or various possible implementations of the first aspect.

[0029] Thirdly, this application provides a high-voltage cascaded energy storage system, including: a battery compartment and a liquid cooling system as described in the second aspect above, wherein a liquid cooling channel (2) is deployed on the battery pack inside the battery compartment.

[0030] The cascaded liquid-cooled piping, liquid-cooling system, and high-voltage cascaded energy storage system provided in this application embodiment connect the chiller unit and the liquid-cooling channels through low-pressure piping deployed in the low-pressure area of ​​the battery compartment and high-pressure piping deployed in the high-pressure area of ​​the battery compartment. The coolant in the liquid-cooled piping provides liquid cooling to the battery pack, reducing its temperature and thus achieving temperature control. A variable-diameter design is achieved by progressively decreasing the diameter of the multi-stage pipes in the high-pressure piping, ensuring uniform coolant flow into the liquid-cooling channels deployed on each battery pack within the battery compartment. This avoids excessive temperature differences between battery packs and improves the temperature stability of the battery pack. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0032] Figure 1 This is a schematic diagram of the structure of the cascaded liquid cooling pipeline provided in the embodiments of this application;

[0033] Figure 2 This is a schematic diagram of a liquid cooling system provided in an embodiment of this application.

[0034] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments.

[0035] Explanation of reference numerals in the attached figures:

[0036] 11-Low-pressure pipeline; 12-High-pressure pipeline; 2-Liquid cooling channel; 121-First high-pressure pipeline; 122-Second high-pressure pipeline; 123-First connector; 124-Second connector; 125-Electrode needle; 1211-Battery compartment pipeline; 1231-Non-metallic part; 1232-Metallic part; 1221-Main pipeline; 1222-Branch pipeline; 1223-Third connector; 1221A-Sub-main pipeline; 1222A-Sub-branch pipeline; 1222B-Inlet branch pipe; 1222C-Outlet branch pipe. Detailed Implementation

[0037] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application as detailed in the appended claims.

[0038] "Multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0039] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the utility model described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, products, or apparatus.

[0040] It should be noted that, in the embodiments of this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0041] Energy storage systems can be categorized into two main technical systems based on the power transmission path: low-voltage boost technology and high-voltage cascade technology. High-voltage cascade energy storage systems, with their advantages of high efficiency and high safety, have become the mainstream technology choice and development direction in the current energy storage field. During normal charging and discharging, the battery packs in an energy storage system generate a significant amount of heat. Therefore, cryogenic coolant is delivered to the liquid cooling plates of each battery pack through liquid cooling pipelines to control the battery pack temperature.

[0042] Currently, liquid cooling pipelines typically use a central return water system, where water flows along the pipeline to various parts that require cooling, carrying away heat before flowing back to the cooling device of the liquid cooling system through the return water end for further cooling, and then is recycled.

[0043] However, the central water return method affects the flow distribution and pressure of the coolant in the pipes, thus impacting the cooling effect.

[0044] The cascaded liquid cooling pipeline provided in this application transports the coolant from the chiller unit to the battery packs in the battery compartment through low-pressure pipelines deployed in the low-pressure area of ​​the battery compartment and high-pressure pipelines deployed in the high-pressure area of ​​the battery compartment. This solves the problem in the prior art that the use of central return water or the lack of variable diameter design leads to large flow deviations in the pipelines distributed to each battery cluster, resulting in large temperature differences between battery clusters.

[0045] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0046] Figure 1 This is a schematic diagram of the cascaded liquid cooling pipeline provided in the embodiments of this application, as shown below. Figure 1 As shown, the cascaded liquid cooling pipeline 1 includes: a low-pressure pipeline 11 and a high-pressure pipeline 12;

[0047] Low-pressure pipeline 11 is deployed in the low-pressure area of ​​the battery compartment of the energy storage system. One end of the low-pressure pipeline 11 is used to connect to the chiller unit of the energy storage system, and the other end is connected to the high-pressure pipeline 12 to connect the chiller unit and the high-pressure pipeline 12.

[0048] The low-pressure zone is used to indicate the area in the battery compartment where the voltage is no greater than 1000V; the chiller unit is used to control the temperature of the coolant.

[0049] Low-pressure pipeline 11 is deployed in the battery compartment of the energy storage system in an area with a voltage not exceeding 1000V. One end of low-pressure pipeline 11 is used to connect to the chiller unit of the energy storage system. Figure 1 One end is connected to the high-pressure pipeline 12 (not shown in the diagram), and the other end is connected to the high-pressure pipeline 12 to connect the chiller unit and the high-pressure pipeline 12. The coolant is connected in the cascaded liquid cooling pipeline, and the coolant in the chiller unit enters the high-pressure pipeline 12 through the low-pressure pipeline 11.

[0050] The cascaded liquid cooling pipeline includes an inlet pipe and an outlet pipe. Understandably, the inlet pipe of the low-pressure pipeline 11 is connected to the outlet of the chiller unit, and the coolant enters the inlet pipe of the low-pressure pipeline 11 from the outlet of the chiller unit; the outlet pipe of the low-pressure pipeline 11 is connected to the inlet of the chiller unit, and the coolant returns to the inlet of the chiller unit from the outlet pipe of the low-pressure pipeline 11, thus realizing coolant circulation.

[0051] In one possible implementation, the low-pressure pipeline 11 is an aluminum alloy pipe or a stainless steel pipe, and the low-pressure pipeline 11 is a corrugated pipe with an outer braided layer.

[0052] Because the voltage in the low-pressure area is relatively low, the impact of voltage on the liquid cooling pipeline is less of a concern. The stability of the metal material and the end sealing structure are sufficient to meet the insulation and leakage prevention requirements of the low-pressure pipeline. The low-pressure pipeline 11 is a corrugated pipe with an external braided layer to absorb assembly errors and transportation bumps, reducing the risk of system leakage.

[0053] High-pressure pipeline 12 is deployed in the high-pressure area of ​​the battery compartment and is used to connect with liquid cooling channel 2 deployed on the battery pack in the battery compartment to connect low-pressure pipeline 11 and liquid cooling channel 2.

[0054] The high-voltage zone indicates the area in the battery compartment where the voltage is no greater than 1000V; the liquid-cooling channel is used for heat exchange with the battery pack to cool the battery pack.

[0055] High-pressure pipeline 12 is deployed in the battery compartment in an area with a voltage not exceeding 1000V and is connected to liquid cooling channel 2 deployed on the battery compartment. Understandably, for the water inlet pipeline, coolant enters the liquid cooling channel 2 from the high-pressure pipeline 12; for the water outlet pipeline, coolant enters the high-pressure pipeline 12 from the liquid cooling channel 2.

[0056] The high-pressure pipeline 12 includes multiple pipelines, with the diameter of each pipeline decreasing progressively.

[0057] The diameter of the multi-stage pipeline decreases step by step to control the uniformity of coolant flow into each battery pack, ensuring that the flow non-uniformity of each battery pack is less than a preset value, such as 3%, thereby ensuring the stability, consistency and safety of the overall performance of multiple battery packs in the battery compartment, and thus extending the service life of multiple battery packs.

[0058] In one possible implementation, the high-pressure pipeline 12 is made of a highly insulating non-metallic material.

[0059] Traditional metal pipelines can experience partial discharge of up to 50pC under 10kV conditions. The high voltage inside the enclosure poses a risk of discharge and arcing to the water circuit, which can lead to problems such as pipeline breakdown and leakage. Therefore, high-voltage pipelines require the use of highly insulating materials.

[0060] The high-pressure pipeline 12 is made of a highly insulating non-metallic material, such as homopolymer polypropylene (PPH), PA12, and PA66.

[0061] Low-pressure line 11 and high-pressure line 12 are used to transport coolant for liquid cooling of the battery pack in the battery compartment.

[0062] Low-pressure line 11 and high-pressure line 12 are used to transport coolant. For the inlet line, coolant enters the low-pressure line 11, the high-pressure line 12, and the liquid-cooled channel 2 deployed on the battery compartment, where the coolant exchanges heat with the battery pack to control the battery pack temperature. For the outlet line, coolant enters the high-pressure line 12 and the low-pressure line 11 from the liquid-cooled channel 2, and then returns to the chiller unit.

[0063] In one possible implementation, the high-pressure line 12 includes a first high-pressure line 121 and a second high-pressure line 122;

[0064] The first high-pressure pipeline 121 is connected to the low-pressure pipeline 11 through the first connector 123 and to the second high-pressure pipeline 122 through the second connector 124, so as to connect the low-pressure pipeline 11 and the second high-pressure pipeline 122. The diameter of the first high-pressure pipeline 121 is larger than that of the second high-pressure pipeline 122.

[0065] The first high-pressure pipeline 121 is located in the high-pressure zone and is deployed at the top of the battery compartment. For example, a PPH pipe can be used for this first high-pressure pipeline. The first high-pressure pipeline 121 is connected to the low-pressure pipeline 11 via a first connector 123 and to the second high-pressure pipeline 122 via a second connector 124. The second connector 124 connects the first high-pressure pipeline 121 and the second high-pressure pipeline 122, which have different diameters, thus achieving a pipe diameter change. The diameter of the first high-pressure pipeline 121 is larger than that of the second high-pressure pipeline 122. This ensures the flow rate of coolant entering each of the second high-pressure pipelines and guarantees the overall stability of the battery compartment performance.

[0066] In one possible implementation, electrode needles 125 are axially and uniformly deployed on the first high-voltage pipeline 121. The electrode needles 125 are connected to the ground via a grounding wire for monitoring potential fluctuations.

[0067] Electrode pins 125 are evenly distributed axially on the first high-voltage pipeline 121. These electrode pins 125 are connected to the battery cluster rack via a grounding wire. When the energy storage system is a containerized system, the grounding wire can also be connected to the container. The electrode pin body is made of stainless steel (SUS304). Pipe clamp brackets are used to fix the electrode pins and are made of glass fiber reinforced PP material to ensure that the surface electric field strength of the bracket is ≤3kV / cm. The electrode pins monitor potential fluctuations in real time via a network and dynamically adjust the grounding resistance. When the electrode pins detect abnormal potential fluctuations, it indicates that the energy storage system may have leakage, short circuit, or other electrical faults. The electrode pins conduct current to the ground, preventing electric shock to personnel and damage to equipment.

[0068] In one possible implementation, the first high-pressure pipeline includes multiple battery compartment internal pipelines 1211, which are connected by quick-connect swivels or unions, wherein the quick-connect swivels are made of plastic. PPH flanges are used at the wall penetration points of the battery compartment internal pipelines 1211 to reduce the risk of leakage.

[0069] The first connector 123 includes a non-metallic part 1231 and a metallic part 1232. The non-metallic part 1231 is connected to the low-pressure pipeline 11, and the metallic part 1232 is connected to the first high-pressure pipeline 121.

[0070] Since the first connector is used to connect the low-pressure pipeline 11 and the high-pressure pipeline 12, the first connector includes a non-metallic part 1231 and a metallic part 1232. The non-metallic part 1231 of the first connector is connected to the low-pressure pipeline 11 located in the low-pressure area of ​​the battery compartment; while the metallic part 1232 of the first connector is connected to the high-pressure pipeline 12 located in the high-pressure area of ​​the battery compartment to ensure electrical safety.

[0071] The second high-pressure pipeline 122 is connected to the first high-pressure pipeline 121 and is deployed on the battery cluster rack inside the battery compartment to connect the first high-pressure pipeline 121 and the liquid cooling channel 2.

[0072] The main body material of the second high-pressure pipeline 122 can be, for example, PA12 and PA66. Metal parts are not allowed to be used in the entire pipeline. The second high-pressure pipeline 122 is connected to the first high-pressure pipeline 121 and is deployed on the battery cluster rack in the battery compartment to connect the first high-pressure pipeline 121 and the liquid cooling channel 2.

[0073] In one possible implementation, the battery cluster rack includes a vertical portion and a horizontal portion; the second high-voltage pipeline includes a main pipeline 1221 and a branch pipeline 1222.

[0074] The main pipeline 1221 is deployed in the vertical part of the battery cluster rack. One end is connected to the first high-voltage pipeline 121, and the other end is connected to the branch pipeline 1222 through the third connector 1223 to connect the first high-voltage pipeline 121 and the branch pipeline 1222. The diameter of the main pipeline 1221 is larger than the diameter of the branch pipeline 1222.

[0075] The battery cluster rack is used to hold battery packs.

[0076] The main pipeline 1221 is perpendicular to the ground and is deployed on the vertical part of the battery cluster rack. One end of the main pipeline 1221 is connected to the first high-voltage pipeline 121 via a second connector 124. The diameter of the first high-voltage pipeline 121 is larger than the diameter of the main pipeline 1221. The other end of the main pipeline 1221 is connected to the branch pipeline 1222 via a third connector 1223. The diameter of the main pipeline 1221 is larger than that of the branch pipeline 1222 to meet the requirements of flow balance within each battery pack and improve the temperature stability of the battery pack.

[0077] Branch pipe 1222 is deployed in the horizontal part of the battery cluster rack and is connected to liquid cooling channel 2 to connect main pipe 1221 and liquid cooling channel 2.

[0078] Branch pipe 1222 is horizontal to the ground and is deployed on the horizontal part of the battery cluster rack. The port of branch pipe 1222 is connected to liquid cooling channel 2 to connect main pipe 1221 and liquid cooling channel 2. Figure 1 Only one liquid cooling channel is shown in the diagram. Understandably, each branch pipe 1222 is connected to the liquid cooling channel 2.

[0079] In one possible implementation, the main pipeline includes multiple sub-main pipelines 1221A, and the branch pipeline includes multiple sub-branch pipelines 1222A; for any two sub-main pipelines among the multiple sub-main pipelines, the two sub-main pipelines are respectively connected to the first port and the second port of the third connector 1223; the third port of the third connector 1223 is connected to any one of the multiple sub-branch pipelines 1222A.

[0080] The main pipeline includes multiple sub-main pipelines 1221A, and the branch pipelines include multiple sub-branch pipelines 1222A. The third connector 1223 includes three ports, of which the first and second ports are connected to the sub-main pipelines 1221A, and the third port is connected to the sub-branch pipelines 1222A. The diameter of the main pipeline 1221 is larger than that of the branch pipelines 1222A; that is, the diameter of the sub-main pipeline 1221A connected to the first and second ports is larger than the diameter of the sub-branch pipeline 1222A connected to the third port. This variable diameter design ensures a uniform flow rate of coolant from the main pipeline into each sub-branch pipeline, guaranteeing that the flow rate unevenness of each battery pack is less than a preset value.

[0081] In one possible implementation, branch pipe 1222 includes inlet branch pipe 1222B and outlet branch pipe 1222C;

[0082] The inlet branch pipe 1222B is connected at one end to the main pipeline 1221 via the third connector 1223 and at the other end to the liquid cooling channel 2, and is used to transport coolant into the liquid cooling channel 2; the outlet branch pipe 1222C is connected at one end to the main pipeline 1221 via the third connector 1223 and at the other end to the liquid cooling channel 2, and is used to transport coolant into the outlet pipe of the main pipeline.

[0083] Inlet branch pipe 1222B and outlet branch pipe 1222C are located on both sides of the battery cluster rack. One end of inlet branch pipe 1222B is connected to the main pipeline 1221 via a third connector 1223; it can be understood that the main pipeline connected to inlet branch pipe 1222B is the inlet pipe of the main pipeline. The other end of inlet branch pipe 1222B is connected to the liquid cooling channel 2, used to transport coolant into the liquid cooling channel 2. One end of outlet branch pipe 1222C is connected to the main pipeline 1221 via a third connector 1223; it can be understood that the main pipeline connected to outlet branch pipe 1222C is the outlet pipe of the main pipeline. The other end of outlet branch pipe 1222C is connected to the liquid cooling channel 2, used to transport coolant into the outlet pipe of the main pipeline.

[0084] The coolant from the chiller unit enters the main pipeline's inlet pipe through the inlet pipe of the low-pressure line and the inlet pipe of the first high-pressure line, then enters the inlet branch pipe 1222B, and finally enters the liquid cooling channel 2 to exchange heat with the battery pack. The outlet branch pipe 1222C delivers the coolant to the outlet pipe of the main pipeline, and then returns to the chiller unit through the outlet pipes of the first high-pressure line and the low-pressure line.

[0085] This application provides a cascaded liquid-cooled piping system. Low-pressure piping deployed in the low-pressure area of ​​the battery compartment and high-pressure piping deployed in the high-pressure area of ​​the battery compartment connect a chiller unit and liquid-cooled channels. The coolant in the liquid-cooled piping system liquid-cools the battery pack, reducing its temperature and thus controlling its temperature. A variable-diameter design is achieved by progressively decreasing the diameter of the multi-stage high-pressure piping, ensuring uniform coolant flow into the liquid-cooled channels on each battery pack within the battery compartment. This prevents excessive temperature differences between battery packs and improves the stability of the battery pack temperature.

[0086] Figure 2 This is a schematic diagram of the structure of a liquid cooling system provided in an embodiment of this application, as shown below. Figure 2 As shown, the liquid cooling system includes a chiller unit 3 and a cascaded liquid cooling pipeline 1 provided in the above-described cascaded liquid cooling pipeline embodiment.

[0087] The liquid cooling system provided in this embodiment has a similar implementation principle and technical effect to the above-described cascaded liquid cooling pipeline embodiment, and will not be described in detail here.

[0088] This application also provides a high-voltage cascaded energy storage system, including: a battery compartment and a liquid cooling system provided in the above-described liquid cooling system embodiment, wherein a liquid cooling channel 2 is deployed on the battery pack inside the battery compartment.

[0089] Finally, it should be noted that those skilled in the art, upon considering the specification and practicing the technical solutions disclosed herein, will readily conceive of other embodiments of this utility model. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A cascaded liquid-cooled piping system, characterized in that, The cascaded liquid cooling pipeline includes: a low-pressure pipeline (11) and a high-pressure pipeline (12). The low-pressure pipeline (11) is deployed in the low-pressure area of ​​the battery compartment of the energy storage system. One end of the low-pressure pipeline (11) is used to connect to the chiller unit (3) of the energy storage system, and the other end is connected to the high-pressure pipeline (12) to connect the chiller unit (3) and the high-pressure pipeline (12). The high-pressure pipeline (12) is deployed in the high-pressure area of ​​the battery compartment and is used to connect with the liquid cooling channel (2) deployed on the battery pack in the battery compartment to connect the low-pressure pipeline (11) and the liquid cooling channel (2). The high-pressure pipeline (12) includes a multi-stage pipeline, the diameter of which decreases progressively. The low-pressure pipeline (11) and the high-pressure pipeline (12) are used to transport coolant for liquid cooling of the battery pack in the battery compartment.

2. The cascaded liquid-cooled piping system according to claim 1, characterized in that, The low-pressure pipeline (11) is an aluminum alloy pipe or a stainless steel pipe, and the low-pressure pipeline (11) is a corrugated pipe with a braided layer wrapped around the outside. The high-pressure pipeline (12) is made of a high-insulation non-metallic material.

3. The cascaded liquid-cooled piping system according to claim 1, characterized in that, The high-pressure pipeline (12) includes a first high-pressure pipeline (121) and a second high-pressure pipeline (122). The first high-pressure pipeline (121) is connected to the low-pressure pipeline (11) through the first connector (123) and to the second high-pressure pipeline (122) through the second connector (124) to connect the low-pressure pipeline (11) and the second high-pressure pipeline (122). The diameter of the first high-pressure pipeline (121) is larger than that of the second high-pressure pipeline (122). The first connector (123) includes a non-metallic part (1231) and a metallic part (1232). The non-metallic part (1231) is connected to the low-pressure pipeline (11), and the metallic part (1232) is connected to the first high-pressure pipeline (121). The second high-pressure pipeline (122) is deployed on the battery cluster rack inside the battery compartment to connect the first high-pressure pipeline (121) and the liquid cooling channel (2).

4. The cascaded liquid-cooled piping system according to claim 3, characterized in that, Electrode needles (125) are uniformly deployed axially on the first high-voltage pipeline (121). The electrode needles (125) are connected to the ground through a grounding wire and are used to monitor potential fluctuations.

5. The cascaded liquid-cooled piping system according to claim 3, characterized in that, The first high-pressure pipeline (121) includes multiple battery compartment pipelines (1211), which are connected by quick-connect spring clips or swivel joints. The quick-connect spring clips are made of plastic.

6. The cascaded liquid-cooled piping system according to claim 3, characterized in that, The battery cluster rack includes a vertical section and a horizontal section; the second high-voltage pipeline (122) includes a main pipeline (1221) and a branch pipeline (1222). The main pipeline (1221) is deployed on the vertical part of the battery cluster rack. One end is connected to the first high-voltage pipeline (121), and the other end is connected to the branch pipeline (1222) through a third connector (1223) to connect the first high-voltage pipeline (121) and the branch pipeline (1222). The diameter of the main pipeline (1221) is larger than the diameter of the branch pipeline (1222). The branch pipe (1222) is deployed on the horizontal part of the battery cluster rack and is connected to the liquid cooling channel (2) to connect the main pipe (1221) and the liquid cooling channel (2).

7. The cascaded liquid-cooled piping system according to claim 6, characterized in that, The main pipeline (1221) includes multiple sub-main pipelines (1221A), and the branch pipeline (1222) includes multiple sub-branch pipelines (1222A). For any two of the plurality of sub-main pipelines (1221A), the two sub-main pipelines (1221A) are respectively connected to the first port and the second port of the third connector (1223); The third port of the third connector is connected to any one of the plurality of sub-branch pipes (1222A).

8. The cascaded liquid-cooled piping system according to claim 7, characterized in that, The branch pipe (1222) includes an inlet branch pipe (1222B) and an outlet branch pipe (1222C). The water inlet branch pipe (1222B) is connected at one end to the main pipeline (1221) via the third connector (1223) and at the other end to the liquid cooling channel (2), for conveying the coolant into the liquid cooling channel (2); The outlet branch pipe (1222C) is connected at one end to the main pipeline (1221) via the third connector (1223) and at the other end to the liquid cooling channel (2), and is used to transport the coolant to the outlet pipe of the main pipeline (1221).

9. A liquid cooling system, comprising: The chiller unit (3) and the cascaded liquid cooling pipeline according to any one of claims 1-8.

10. A high-voltage cascaded energy storage system, comprising: The battery compartment and the liquid cooling system of claim 9, wherein the battery pack in the battery compartment is provided with liquid cooling channels (2).

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