Energy storage liquid cooling pipeline system with balancing function and control method

Abstract

The invention provides an energy storage liquid cooling pipeline system with a balancing function and a control method. The energy storage liquid cooling pipeline system comprises a first-stage pipeline, a plurality of second-stage pipelines and a plurality of third-stage pipelines, the primary pipeline comprises a first liquid inlet pipeline and a first liquid return pipeline; the first liquid inlet pipeline is communicated with a liquid inlet of the liquid cooling unit; the first liquid return pipeline is communicated with a liquid return port of the liquid cooling unit; the height difference between the first liquid inlet pipeline and the first liquid return pipeline is greater than or equal to 1.6 m; the secondary pipelines are arranged below the first liquid inlet pipeline; the first liquid inlet pipeline and the first liquid return pipeline are each provided with a water flow acceleration device. Through reasonable arrangement of the liquid cooling pipeline, the cooling liquid flows in and out in an upper-in and lower-out manner, so that uniform liquid feeding is ensured, the cooling efficiency of the battery pack is effectively improved, the uniformity of the temperature of each part in the battery pack in the three-stage pipeline is ensured, and the balance of the whole liquid cooling pipeline system is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal balance of large-scale energy storage systems with new energy, and in particular relates to a liquid cooling pipeline system for energy storage with a balance function and a control method. Background Art

[0002] The existing liquid cooling system basically flows the coolant along the liquid cooling pipeline to the bottom of the battery module, and then uses heat conduction to remove excess heat, thereby cooling the energy storage system during the entire operating condition and preventing overheating. However, as the demand for the energy storage industry continues to increase, large-capacity, high-density energy storage systems are getting larger and larger, and the original liquid cooling system can no longer meet current product requirements. A typical problem is that the higher the energy storage battery rack, the less pressure the coolant has on the battery module at the top, the slower the flow rate, and uneven temperatures throughout the energy storage system often occur, posing a severe challenge to the thermal control of the entire energy storage system.

[0003] CN221057519U discloses a liquid cooling pipeline for an energy storage system, which utilizes a liquid inlet pipe, a shunt pipe, a plurality of flow tube groups and a liquid outlet pipe. The shunt pipe is arranged at the front end of the liquid inlet pipe. When the liquid flows through the shunt pipe, the liquid flows into the interior of the flow tube group through different shunt cavities, thereby realizing liquid separation. Through a large number of shunt pipes, equal flow of liquid inside each flow tube group is realized. However, the above scheme greatly increases the workload of pipeline layout and increases the assembly area of ​​the pipeline.

[0004] CN107403975A discloses a flow equalization device and method for a liquid cooling system of an energy storage battery. The flow equalization device for the liquid cooling system of an energy storage battery includes a plurality of battery modules arranged in parallel, each of which is connected to a liquid cooling system and is provided with a coolant inlet, a throttle tube is provided in the coolant inlet, a throttle hole is provided on the throttle tube, and the coolant entering the coolant inlet is adjusted to an equal pressure through the throttle tube. The throttle tube is provided to adjust the pipeline pressure, but the solution still increases the workload of pipeline layout.

[0005] In summary, the above solutions all have the problems of low feasibility, complex structure, high cost, and are not conducive to actual implementation. Therefore, providing a liquid cooling pipeline system for energy storage that can solve the above problems is a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0006] The purpose of the present invention is to provide a liquid cooling pipeline system and control method for energy storage with a balancing function. Through the reasonable setting of the liquid cooling pipeline, the coolant flows in and out in an upward-in-and-down-out manner, ensuring uniform liquid delivery, effectively improving the cooling efficiency of the battery pack, and ensuring the uniformity of the temperature at various locations in the battery pack in the three-level pipeline, thereby improving the balance of the overall liquid cooling pipeline system.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a liquid cooling pipeline system for energy storage with a balancing function, the liquid cooling pipeline system for energy storage comprising a primary pipeline, a plurality of secondary pipelines and a plurality of tertiary pipelines;

[0009] The primary pipeline includes a first liquid inlet pipeline and a first liquid return pipeline; the first liquid inlet pipeline is connected to the liquid inlet of the liquid cooling unit; the first liquid return pipeline is connected to the liquid return port of the liquid cooling unit;

[0010] The height difference between the first liquid inlet pipeline and the first liquid return pipeline is ≥1.6m; the secondary pipelines are all arranged below the first liquid inlet pipeline;

[0011] The first liquid inlet pipeline and the first liquid return pipeline are both provided with a water flow acceleration device;

[0012] The secondary pipeline includes a second liquid inlet pipeline and a second liquid return pipeline; the second liquid inlet pipeline is connected to the first liquid inlet pipeline; the second liquid return pipeline is connected to the first liquid return pipeline;

[0013] The tertiary pipeline includes a third liquid inlet pipeline and a third liquid return pipeline; one end of the third liquid inlet pipeline is connected to the second liquid inlet pipeline, and the other end is connected to the battery assembly; one end of the third liquid return pipeline is connected to the second liquid return pipeline, and the other end is connected to the battery assembly.

[0014] In the present invention, the height difference between the first liquid inlet pipeline and the first liquid return pipeline is ≥1.6m, for example, it can be 1.65m, 1.7m, 1.75m, 1.8m, 1.85m, 1.9m, 1.95m or 2m, but is not limited to the listed values, and other values ​​within the numerical range are also applicable.

[0015] In the present invention, the connection between the primary pipeline and the secondary pipeline and the connection between the secondary pipeline and the tertiary pipeline are both provided with throttle valves for regulating the flow rate of the coolant. The first liquid inlet pipeline and the first liquid return pipeline are both arranged in a gate shape, which effectively improves the space utilization rate.

[0016] The liquid cooling pipeline system for energy storage provided by the present invention enables the coolant to flow in and out in an upward-in-and-down-out manner through reasonable arrangement of the liquid cooling pipeline, thereby ensuring pressure balance at various locations in the liquid cooling pipeline system, achieving uniform liquid delivery, effectively improving the cooling efficiency of the battery pack, and ensuring the uniformity of temperature at various locations in the battery pack in the three-stage pipeline, thereby improving the balance of the overall liquid cooling pipeline system.

[0017] It is worth noting that by controlling the height difference between the first liquid inlet pipeline and the first liquid return pipeline, and controlling the secondary pipelines to be set below the first liquid inlet pipeline, the coolant is allowed to flow in an upward-in-and-downward manner through the primary pipeline, secondary pipeline and tertiary pipeline of the liquid cooling pipeline, which can not only reduce the flow resistance, reduce the power consumption of the pump body, achieve uniform liquid delivery, increase product safety, but also improve the cooling efficiency; in addition, water flow acceleration devices are provided on the first liquid inlet pipeline and the first liquid return pipeline to avoid the problem of underpressure in the primary pipeline due to insufficient pump head of the liquid cooling unit, thereby effectively regulating the flow of coolant and ensuring pressure balance at all locations of the liquid cooling pipeline system.

[0018] As a preferred technical solution of the present invention, a water flow acceleration device is provided in the middle section of the first liquid inlet pipeline and the first liquid return pipeline.

[0019] In the present invention, in order to avoid insufficient lift in the second half of the primary pipeline, a water flow acceleration device is provided in the middle section thereof, and secondary pressurization is started, thereby ensuring that the coolant flow rate in the second half meets the demand and avoiding uneven coolant flow.

[0020] As a preferred technical solution of the present invention, the length of the first liquid return pipeline is 4-6m, for example, it can be 4.2m, 4.5m, 4.6m, 4.8m, 5m, 5.2m, 5.5m, 5.6m or 5.8m, but is not limited to the listed values, and other values ​​within the numerical range are also applicable.

[0021] In the present invention, by reasonably setting the length of the first liquid return pipeline, the pressure drop of the coolant in the pipeline is reduced, and the energy consumption of the system is improved.

[0022] Preferably, the spacing between adjacent second liquid inlet pipelines is 75-100 cm, for example, it can be 76 cm, 78 cm, 80 cm, 82 cm, 85 cm, 86 cm, 88 cm, 90 cm, 92 cm, 95 cm, 96 cm or 98 cm, but is not limited to the listed values, and other values ​​within the numerical range are also applicable.

[0023] In the present invention, the distance between adjacent second liquid return pipelines is 75-100 cm.

[0024] In the present invention, by controlling the spacing between adjacent second liquid inlet pipelines (second liquid return pipelines), not only the flow resistance of the coolant can be reduced, but also the heat exchange efficiency can be improved, thereby providing the safety and reliability of the liquid cooling pipeline system.

[0025] As a preferred technical solution of the present invention, the water outlet of the third liquid inlet pipeline is arranged at the top of the battery assembly and is located above the water inlet of the third liquid return pipeline.

[0026] In the present invention, the coolant is controlled to flow downward from the top of the battery assembly in sequence to reduce flow resistance and increase product reliability.

[0027] In the present invention, in the energy storage system, the battery assembly includes a battery system and / or a PCS, preferably a battery pack.

[0028] As a preferred technical solution of the present invention, the inner diameter of the primary pipeline is 23-28 mm, for example, it can be 23.5 mm, 24 mm, 24.5 mm, 25 mm, 25.5 mm, 26 mm, 26.5 mm, 27 mm or 27.5 mm, but is not limited to the listed values, and other values ​​within the numerical range are also applicable.

[0029] Preferably, the inner diameter of the secondary pipeline is 13-15 mm, for example, it can be 13.2 mm, 13.5 mm, 13.6 mm, 13.8 mm, 14 mm, 14.2 mm, 14.5 mm, 14.6 mm or 14.8 mm, but is not limited to the listed values, and other values ​​within the numerical range are also applicable.

[0030] Preferably, the inner diameter of the tertiary pipeline is 8.5-9.5 mm, for example, it can be 8.6 mm, 8.7 mm, 8.8 mm, 8.9 mm, 9 mm, 9.1 mm, 9.2 mm, 9.3 mm or 9.4 mm, but is not limited to the listed values, and other values ​​within the numerical range are also applicable.

[0031] In the present invention, by controlling the inner diameter ranges of the primary pipeline, the secondary pipeline and the tertiary pipeline, not only can the flow of the coolant in the tertiary pipeline be uniform, but also the coolant can be evenly distributed among the battery packs to reduce the temperature difference.

[0032] As a preferred technical solution of the present invention, a plurality of the secondary pipelines are arranged in parallel along the length direction of the primary pipeline.

[0033] Preferably, a plurality of the tertiary pipelines are arranged in parallel at intervals along the length direction of the secondary pipeline.

[0034] In the present invention, each tertiary pipeline is connected to a battery assembly. By providing a plurality of secondary pipelines and tertiary pipelines, the space occupied by the energy storage system can be reduced and the space utilization rate can be effectively improved.

[0035] As a preferred technical solution of the present invention, the water inlets of the second liquid inlet pipeline are each independently provided with a first temperature detection device and a first control valve.

[0036] Preferably, the first control valve is used to control the on-off of the second liquid inlet pipeline.

[0037] Preferably, the water outlets of the second liquid return pipeline are each independently provided with a second temperature detection device and a second control valve.

[0038] Preferably, the second control valve is used to control the on-off of the second liquid return pipeline.

[0039] In the present invention, a temperature detection device and a control valve are arranged at the water inlet and outlet of the secondary pipeline to ensure that the secondary pipeline is controllable, and the coolant flow in the single battery rack can be automatically regulated by the liquid cooling unit terminal to avoid confusion in the flow resistance of the entire liquid cooling pipeline after the water flow acceleration device is pressurized.

[0040] Preferably, the water inlets of the third liquid inlet pipeline are each independently provided with a third temperature detection device and a third control valve.

[0041] Preferably, the third control valve is used to control the on-off of the third liquid inlet pipeline.

[0042] Preferably, the water outlets of the third liquid return pipeline are each independently provided with a fourth temperature detection device and a fourth control valve.

[0043] Preferably, the fourth control valve is used to control the on-off of the third liquid return pipeline.

[0044] In the present invention, by arranging temperature detection devices and control valves at the water inlet and outlet in the tertiary pipeline, it is convenient to accurately determine whether the heat source has failed, without the need to check the entire system. Feedback can be given to the control component, and then the flow rate of the entire system is automatically balanced through the liquid cooling unit terminal, and the cooling capacity is adjusted to achieve temperature uniformity at various locations in the battery pack in the tertiary pipeline.

[0045] In the present invention, the first control valve, the second control valve, the third control valve and the fourth control valve are all solenoid valves.

[0046] As a preferred technical solution of the present invention, the liquid cooling pipeline system for energy storage also includes a control component.

[0047] Preferably, the control component is independently connected to the liquid cooling unit, the water flow acceleration device, the temperature detection device, and the control valve through signals.

[0048] In a second aspect, the present invention provides a control method for the liquid cooling pipeline system for energy storage as described in the first aspect, the control method comprising:

[0049] The coolant flowing out of the liquid cooling unit is flowed into the first liquid inlet pipeline, the second liquid inlet pipeline and the third liquid inlet pipeline in sequence in a top-in and bottom-out manner, and then transported to the battery assembly. After heat exchange, the coolant is returned to the liquid cooling unit through the third liquid return pipeline, the second liquid return pipeline and the first liquid return pipeline in sequence, and the flow rate of the coolant is controlled by a water flow acceleration device.

[0050] In the present invention, the real-time temperature of the battery assembly and the initial temperature of the coolant in the liquid cooling pipeline system for energy storage are obtained, and the ideal temperature value of the heat source is set; the heat dissipation is calculated according to the difference between the ideal temperature value of the heat source and the real-time temperature; the flow rate of the coolant is calculated according to the heat dissipation and the initial temperature of the coolant.

[0051] The control method provided by the present invention adopts a method of cooling liquid entering from top to bottom and exiting from bottom to reduce flow resistance, reduce power consumption of the pump body, achieve uniform liquid delivery, and pressurize the cooling liquid through a water flow acceleration device to ensure that the flow rate of the cooling liquid is stable in the entire liquid cooling pipeline system, thereby ensuring the uniformity of temperature at various locations of the battery pack in the three-stage pipeline, thereby improving the balance of the overall liquid cooling pipeline system and the stability of the battery pack.

[0052] As a preferred technical solution of the present invention, the coolant in the third liquid inlet pipeline flows in along the top of the battery assembly, and then flows out along the bottom of the battery assembly to the third liquid return pipeline.

[0053] Preferably, the flow rate of the coolant is adjusted according to the real-time temperatures of the first temperature detection device, the second temperature detection device, the third temperature detection device and the fourth temperature detection device.

[0054] Preferably, whether a fault occurs in the secondary pipeline is determined based on the temperature difference between the first temperature detection device and the second temperature detection device.

[0055] Preferably, whether the heat source fails is determined based on the temperature difference between the third temperature detection device and the fourth temperature detection device.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] (1) The energy storage liquid cooling pipeline system provided by the present invention, through the reasonable arrangement of the liquid cooling pipeline, combined with the arrangement of the water flow acceleration device and the temperature detection device, enables the coolant to flow in and out in an upper-in-lower-out manner, ensures the pressure balance at various locations of the liquid cooling pipeline system, realizes uniform liquid delivery, effectively improves the cooling efficiency of the battery pack, and ensures the uniformity of the temperature at various locations in the battery pack in the three-stage pipeline, thereby improving the balance of the overall liquid cooling pipeline system, wherein the maximum temperature difference between the battery packs is less than 3°C;

[0058] (2) The energy storage liquid cooling pipeline system provided by the present invention has high feasibility, low cost, simple structure, and can also reduce the space occupied by the energy storage system, effectively improving the space utilization rate;

[0059] (3) The control method provided by the present invention can not only automatically adjust the coolant flow rate in the liquid cooling pipeline system to avoid the problem of flow resistance chaos in the liquid cooling pipeline, but also accurately determine whether the battery pack has a fault without the need to check the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 A schematic diagram of the structure of the liquid cooling pipeline system for energy storage provided in Example 1;

[0061] Figure 2 A front view of the liquid cooling pipeline system for energy storage provided in Example 1;

[0062] Figure 3 for Figure 2 Front view of the coolant flow direction in the middle pipeline;

[0063] Figure 4 for Figure 2 Side view of the coolant flow direction in the middle section pipeline;

[0064] Among them, 1-liquid cooling unit; 2-first liquid inlet pipeline; 3-first temperature detection device, 4-first electromagnetic control valve; 5-second liquid inlet pipeline; 6-water flow acceleration device; 7-third liquid inlet pipeline; 8-first liquid return pipeline; 9-second liquid return pipeline; 10-third liquid return pipeline; 11-fourth temperature detection device; 12-third electromagnetic control valve;

[0065] The arrows indicate the flow direction of the coolant. DETAILED DESCRIPTION

[0066] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0067] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and through specific implementation methods. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0068] In the following embodiments and comparative examples, throttle valves are provided at the connection between the primary pipeline and the secondary pipeline and at the connection between the secondary pipeline and the tertiary pipeline; the number of the secondary pipelines is determined according to the length of the first liquid return pipeline and the distance between the second liquid inlet pipeline and the second liquid return pipeline; the number of the tertiary pipelines is adjusted according to the size of the battery pack, and can be determined by those skilled in the art according to actual conditions.

[0069] Example 1

[0070] This embodiment provides a liquid cooling pipeline system for energy storage with a balancing function (such as Figure 1-4 As shown), the energy storage liquid cooling pipeline system includes a primary pipeline, a plurality of secondary pipelines and a plurality of tertiary pipelines;

[0071] A plurality of the secondary pipelines are arranged in parallel along the length direction of the primary pipeline; a plurality of the tertiary pipelines are arranged in parallel at intervals along the length direction of the secondary pipeline; the inner diameter of the primary pipeline is 25 mm; the inner diameter of the secondary pipeline is 14 mm; the inner diameter of the tertiary pipeline is 9 mm;

[0072] The primary pipeline includes a first liquid inlet pipeline 2 and a first liquid return pipeline 8; the first liquid inlet pipeline 2 is connected to the liquid inlet of the liquid cooling unit 1; the first liquid return pipeline 8 is connected to the liquid return port of the liquid cooling unit 1;

[0073] The height difference between the first liquid inlet pipeline 2 and the first liquid return pipeline 8 is 1.8m; the secondary pipelines are all arranged below the first liquid inlet pipeline 2;

[0074] The first liquid inlet pipeline 2 and the first liquid return pipeline 8 are both arranged in a gate shape; the middle sections of the first liquid inlet pipeline 2 and the first liquid return pipeline 8 are both provided with a water flow acceleration device 6;

[0075] The secondary pipeline includes a second liquid inlet pipeline 5 and a second liquid return pipeline 9; the second liquid inlet pipeline 5 is connected to the first liquid inlet pipeline 2; the second liquid return pipeline 9 is connected to the first liquid return pipeline 8;

[0076] The length of the first liquid return pipeline 8 is 5m; the distance between adjacent second liquid inlet pipelines 2 (or second liquid return pipelines 9) is 80cm;

[0077] The tertiary pipeline includes a third liquid inlet pipeline 7 and a third liquid return pipeline 10; one end of the third liquid inlet pipeline 7 is connected to the second liquid inlet pipeline 5, and the other end is connected to the battery pack; one end of the third liquid return pipeline 10 is connected to the second liquid return pipeline 9, and the other end is connected to the battery pack; the water outlet of the third liquid inlet pipeline 7 is arranged at the top of the battery pack, and is located above the water inlet of the third liquid return pipeline 10;

[0078] The water inlet of the second liquid inlet pipeline 5 is independently provided with a first temperature detection device 3 and a first electromagnetic control valve 4; the first electromagnetic control valve 4 is used to control the on-off of the second liquid inlet pipeline 5; the water outlet of the second liquid return pipeline 9 is independently provided with a second temperature detection device and a second electromagnetic control valve; the second electromagnetic control valve is used to control the on-off of the second liquid return pipeline 9; the water inlet of the third liquid inlet pipeline 7 is independently provided with a third temperature detection device and a third electromagnetic control valve 12; the third electromagnetic control valve 12 is used to control the on-off of the third liquid inlet pipeline 7; the water outlet of the third liquid return pipeline 10 is independently provided with a fourth temperature detection device 11 and a fourth electromagnetic control valve; the fourth electromagnetic control valve is used to control the on-off of the third liquid return pipeline 10;

[0079] The energy storage liquid cooling pipeline system also includes a control component; the control component is independently connected to the liquid cooling unit, the water flow acceleration device, the temperature detection device, and the control valve through signals.

[0080] Example 2

[0081] This embodiment provides a liquid cooling pipeline system for energy storage with a balancing function. Except that the height difference between the first liquid inlet pipeline and the first liquid return pipeline is 2m; the length of the first liquid return pipeline is 6m; and the spacing between adjacent second liquid inlet pipelines (or second liquid return pipelines) is 100cm, other conditions are the same as those in Example 1.

[0082] Example 3

[0083] This embodiment provides a liquid cooling pipeline system for energy storage with a balancing function. Except that the height difference between the first liquid inlet pipeline and the first liquid return pipeline is 1.6m; the length of the first liquid return pipeline is 4m; the spacing between adjacent second liquid inlet pipelines (or second liquid return pipelines) is 75cm, other conditions are the same as those in Example 1.

[0084] Example 4

[0085] This embodiment provides a liquid cooling pipeline system for energy storage with a balancing function. Except that the spacing between adjacent second liquid inlet pipelines (or second liquid return pipelines) is 50 cm, other conditions are the same as those in Embodiment 1.

[0086] Example 5

[0087] This embodiment provides a liquid cooling pipeline system for energy storage with a balancing function. Except that the spacing between adjacent second liquid inlet pipelines (or second liquid return pipelines) is 130 cm, other conditions are the same as those in Embodiment 1.

[0088] Example 6

[0089] This embodiment provides a liquid cooling pipeline system for energy storage with a balancing function. Except that the inner diameter of the secondary pipeline is 25 mm, other conditions are the same as those of Embodiment 1.

[0090] Example 7

[0091] This embodiment provides a liquid cooling pipeline system for energy storage with a balancing function. Except that the inner diameter of the secondary pipeline is 9 mm, other conditions are the same as those of Embodiment 1.

[0092] Example 8

[0093] This embodiment provides a liquid cooling pipeline system for energy storage with a balancing function. Except that the water inlet of the second liquid inlet pipeline and the water outlet of the second liquid return pipeline are not provided with a temperature detection device, other conditions are the same as those of Embodiment 1.

[0094] Comparative Example 1

[0095] This comparative example provides a liquid cooling pipeline system for energy storage, except that the height difference between the first liquid inlet pipeline and the first liquid return pipeline is 1 meter, other conditions are the same as those of Example 1.

[0096] Comparative Example 2

[0097] This comparative example provides a liquid cooling pipeline system for energy storage, except that the height difference between the first liquid inlet pipeline and the first liquid return pipeline is 0.3m, and the secondary pipeline is arranged above the first liquid inlet pipeline, other conditions are the same as those of Example 1.

[0098] Comparative Example 3

[0099] This comparative example provides a liquid cooling pipeline system for energy storage, except that the middle sections of the first liquid inlet pipeline and the first liquid return pipeline are not provided with a water flow acceleration device, other conditions are the same as those of Example 1.

[0100] In the following application examples and comparative application examples, the liquid cooling pipeline system for energy storage was subjected to air tightness inspection, vacuuming, coolant injection and startup debugging in sequence before operation.

[0101] Application Example 1

[0102] This application example provides a balanced control method for a liquid cooling pipeline system for energy storage. The balanced control method is performed using the liquid cooling pipeline system for energy storage provided in Example 1. The balanced control method includes:

[0103] The coolant flowing out of the liquid cooling unit flows into the first liquid inlet pipeline, the second liquid inlet pipeline and the third liquid inlet pipeline in a top-in and bottom-out manner, and then flows into the battery pack along the top and exchanges heat, and then flows out along the bottom of the battery pack to the third liquid return pipeline, and then flows back to the liquid cooling unit through the second liquid return pipeline and the first liquid return pipeline in sequence;

[0104] Among them, the flow rate of the coolant is controlled by a water flow acceleration device; the flow rate of the coolant is adjusted by a throttle valve according to the real-time temperatures of the first temperature detection device, the second temperature detection device, the third temperature detection device and the fourth temperature detection device; based on the temperature difference between the first temperature detection device and the second temperature detection device, it is judged whether the secondary pipeline is faulty; based on the temperature difference between the third temperature detection device and the fourth temperature detection device, it is judged whether the battery pack is faulty.

[0105] Application Examples 2-8 and Comparative Application Examples 1-3

[0106] Except for using the energy storage liquid cooling pipeline system provided in Examples 2-9 and Comparative Examples 1-3, other conditions are the same as those in Application Example 1.

[0107] The maximum temperature difference between the battery packs in the energy storage liquid cooling pipeline system of the above application example and the comparative application example was recorded, and the results were analyzed; the above results are shown in Table 1.

[0108] Table 1

[0109]

[0110]

[0111] Among them, “ / ” means that the temperature difference between battery packs in the liquid cooling pipeline system cannot be effectively measured.

[0112] It can be seen from Table 1 that the liquid cooling pipeline system and control method for energy storage provided by the present invention, through the reasonable arrangement of the liquid cooling pipeline, allows the coolant to flow in and out in an upward-in-and-down-out manner, ensuring uniform liquid delivery, effectively improving the cooling efficiency of the battery pack, and ensuring the uniformity of the temperature at various locations in the battery pack in the three-stage pipeline, thereby improving the balance of the overall liquid cooling pipeline system.

[0113] The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed structural features, that is, it does not mean that the present invention must rely on the above-mentioned detailed structural features to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the components selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A liquid cooling pipeline system for energy storage with a balancing function, characterized in that: The energy storage liquid cooling pipeline system includes a primary pipeline, a plurality of secondary pipelines and a plurality of tertiary pipelines; The primary pipeline includes a first liquid inlet pipeline and a first liquid return pipeline; the first liquid inlet pipeline is connected to the liquid inlet of the liquid cooling unit; the first liquid return pipeline is connected to the liquid return port of the liquid cooling unit; The height difference between the first liquid inlet pipeline and the first liquid return pipeline is ≥1.6m; the secondary pipelines are all arranged below the first liquid inlet pipeline; The first liquid inlet pipeline and the first liquid return pipeline are both provided with a water flow acceleration device; The secondary pipeline includes a second liquid inlet pipeline and a second liquid return pipeline; the second liquid inlet pipeline is connected to the first liquid inlet pipeline; the second liquid return pipeline is connected to the first liquid return pipeline; The tertiary pipeline includes a third liquid inlet pipeline and a third liquid return pipeline; one end of the third liquid inlet pipeline is connected to the second liquid inlet pipeline, and the other end is connected to the battery assembly; one end of the third liquid return pipeline is connected to the second liquid return pipeline, and the other end is connected to the battery assembly.

2. The liquid cooling pipeline system for energy storage according to claim 1, characterized in that: The middle sections of the first liquid inlet pipeline and the first liquid return pipeline are both provided with water flow acceleration devices.

3. The liquid cooling pipeline system for energy storage according to claim 1 or 2, characterized in that: The length of the first liquid return pipeline is 4-6m; Preferably, the distance between adjacent second liquid inlet pipelines is 75-100 cm.

4. The liquid cooling pipeline system for energy storage according to any one of claims 1 to 3, characterized in that: The water outlet of the third liquid inlet pipeline is arranged at the top of the battery assembly and is located above the water inlet of the third liquid return pipeline.

5. The liquid cooling pipeline system for energy storage according to any one of claims 1 to 4, characterized in that: The inner diameter of the primary pipeline is 23-28 mm; Preferably, the inner diameter of the secondary pipeline is 13-15 mm; Preferably, the inner diameter of the tertiary pipeline is 8.5-9.5 mm.

6. The liquid cooling pipeline system for energy storage according to any one of claims 1 to 5, characterized in that: A plurality of the secondary pipelines are arranged in parallel along the length direction of the primary pipeline; Preferably, a plurality of the tertiary pipelines are arranged in parallel at intervals along the length direction of the secondary pipeline.

7. The liquid cooling pipeline system for energy storage according to any one of claims 1 to 6, characterized in that: The water inlets of the second liquid inlet pipeline are each independently provided with a first temperature detection device and a first control valve; Preferably, the first control valve is used to control the on-off of the second liquid inlet pipeline; Preferably, the water outlets of the second liquid return pipeline are each independently provided with a second temperature detection device and a second control valve; Preferably, the second control valve is used to control the on-off of the second liquid return pipeline; Preferably, the water inlets of the third liquid inlet pipeline are each independently provided with a third temperature detection device and a third control valve; Preferably, the third control valve is used to control the on-off of the third liquid inlet pipeline; Preferably, the water outlets of the third liquid return pipeline are each independently provided with a fourth temperature detection device and a fourth control valve; Preferably, the fourth control valve is used to control the on-off of the third liquid return pipeline.

8. The liquid cooling pipeline system for energy storage according to any one of claims 1 to 7, characterized in that: The liquid cooling pipeline system for energy storage also includes a control component; Preferably, the control component is independently connected to the liquid cooling unit, the water flow acceleration device, the temperature detection device, and the control valve through signals.

9. A control method using the liquid cooling pipeline system for energy storage according to any one of claims 1 to 8, characterized in that: The control method comprises: The coolant flowing out of the liquid cooling unit is flowed into the first liquid inlet pipeline, the second liquid inlet pipeline and the third liquid inlet pipeline in sequence in a top-in and bottom-out manner, and then transported to the battery assembly. After heat exchange, the coolant is returned to the liquid cooling unit through the third liquid return pipeline, the second liquid return pipeline and the first liquid return pipeline in sequence, and the flow rate of the coolant is controlled by a water flow acceleration device.

10. The control method according to claim 9, characterized in that: The coolant in the third liquid inlet pipeline flows in along the top of the battery assembly, and then flows out along the bottom of the battery assembly to the third liquid return pipeline; Preferably, the flow rate of the coolant is adjusted according to the real-time temperatures of the first temperature detection device, the second temperature detection device, the third temperature detection device and the fourth temperature detection device; Preferably, judging whether the secondary pipeline has a fault is based on the temperature difference between the first temperature detection device and the second temperature detection device; Preferably, whether the heat source fails is determined based on the temperature difference between the third temperature detection device and the fourth temperature detection device.

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