Dynamic immersed energy storage pipeline and energy storage system thereof

Abstract

The utility model discloses a dynamic immersed energy storage pipeline and an energy storage system thereof. The dynamic immersed energy storage pipeline comprises a plurality of first liquid inlet branch pipelines arranged on the outer side of a liquid inlet of a battery box in parallel and a plurality of first liquid outlet branch pipelines arranged on the outer side of a liquid outlet of the battery box, the first liquid inlet branch pipelines are communicated with the first liquid inlet header pipe, the first liquid outlet branch pipelines are communicated with the first liquid outlet header pipe, cooling liquid in the first liquid outlet header pipe flows into the first liquid inlet header pipe through the heat exchange mechanism to complete primary circulation, and the first liquid inlet header pipe, the first liquid outlet header pipe and the heat exchange mechanism are arranged in the liquid cooling unit; the single first liquid inlet branch pipeline is provided with a pressure reducing valve; and a pressure gauge and a flow meter are arranged between the pressure reducing valve and the liquid inlet of the battery box. According to the utility model, the design strength of the box body and the box cover is effectively reduced, so that the thickness of the box body and the box cover is reduced, in addition, the pressure gauge and the flowmeter are arranged to ensure the pressure and the flow of cooling liquid at the liquid inlet of the battery box, the length of a branch pipeline is reduced, and the cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage systems, specifically to a dynamic submerged energy storage pipeline and its energy storage system. Background Technology

[0002] Existing submerged energy storage systems, whether using cluster-level or pack-level immersion, all have safety issues. These mainly include excessive pressure causing deformation of the liquid cooling pipes inside the battery pack, which can even lead to leakage, contamination, and thermal runaway. Ultimately, this can cause mixed contamination of the immersion liquid and electrolyte throughout the entire circuit, reducing the safety performance of the entire submerged energy storage system, increasing subsequent maintenance costs, and being detrimental to environmental protection.

[0003] Therefore, it is urgent to propose a new solution to the above problems. Summary of the Invention

[0004] This invention provides a dynamic immersion energy storage pipeline and its energy storage system, which can solve the problem in the prior art where excessive pressure in the liquid cooling pipe inside the battery pack causes deformation, and even leads to leakage, contamination and thermal runaway, ultimately resulting in mixed contamination of the immersion liquid and electrolyte in the entire circuit, thus reducing the safety performance of the entire immersion energy storage system.

[0005] This utility model provides a dynamic immersion energy storage pipeline, including multiple first inlet branch pipelines and first outlet branch pipelines arranged in parallel outside the liquid inlet of the battery box.

[0006] Multiple first liquid inlet branch pipes are connected to the first liquid inlet main pipe, and multiple first liquid outlet branch pipes are connected to the first liquid outlet main pipe. The coolant in the first liquid outlet main pipe flows back into the first liquid inlet main pipe through the heat exchange mechanism to complete one cycle. The first liquid inlet main pipe, the first liquid outlet main pipe and the heat exchange mechanism are installed in the liquid cooling unit.

[0007] A pressure reducing valve is installed on the first inlet branch pipe, and a pressure gauge and a flow meter are installed between the pressure reducing valve and the battery box inlet.

[0008] Furthermore, the heat exchange mechanism includes a heat exchanger, an expansion valve, a condenser, and a compressor arranged in sequence, wherein the upper and lower ends of the heat exchanger are respectively connected to the first liquid outlet manifold and the first liquid inlet manifold.

[0009] Furthermore, the lower end of the battery box is provided with a second main inlet pipe connected to the battery box inlet in the width direction. The second main inlet pipe is divided into multiple second branch inlet pipes arranged parallel to each other in the length direction of the battery box. There is a gap between the outlet of the second branch inlet pipe and the end plate of the battery box. Each second branch inlet pipe is located below a single battery cell. There is a gap between two adjacent battery cells for coolant to flow. The upper end of the battery box is provided with a second outlet pipe, which is connected to the first branch outlet pipe.

[0010] Furthermore, the second liquid outlet pipeline includes a horizontally arranged second liquid outlet horizontal pipe and a vertically arranged second liquid outlet vertical pipe. The top end of the second liquid outlet horizontal pipe is provided with multiple overflow holes. The coolant flows through the overflow holes, the second liquid outlet horizontal pipe and the second liquid outlet vertical pipe in sequence, and then flows to the first liquid outlet branch pipeline.

[0011] Furthermore, the bottom surface of the battery box is provided with multiple grooves along its length to accommodate the second liquid inlet branch pipe.

[0012] Furthermore, a heat insulation pad is installed in the gap between two adjacent battery cells.

[0013] Furthermore, the battery box inlet and outlet are located at the same end of the battery box.

[0014] Furthermore, the first liquid outlet main pipe is equipped with an expansion tank for stabilizing the cooling hydraulic pressure and a water pump for pressurization.

[0015] Furthermore, a heater for heating the coolant is provided on the first inlet manifold.

[0016] This utility model also provides an energy storage system, including the above-mentioned dynamic submersible energy storage pipeline.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. This utility model sets up multiple first inlet branch pipes and first outlet branch pipes connected in parallel outside the battery box inlet and outlet, respectively, and sets up pressure reducing valves on each inlet pipe to reduce the pipeline pressure in each battery module. This makes the flow rate of coolant into each battery box consistent, and the coolant temperature in each battery module will not be significantly different. It can also effectively reduce the design strength of the box cover, thereby reducing the thickness of the box cover. In addition, pressure gauges and flow meters are used to measure the pressure and flow rate of coolant at the battery box inlet. Finally, by setting the first inlet main pipe and the first outlet main pipe inside the liquid cooling unit, the length of the first inlet branch pipe and the first outlet branch pipe is reduced, saving costs.

[0019] 2. The battery box of this utility model adopts multiple second liquid inlet branch pipes arranged along the length direction, and sets gaps between adjacent cells for the flow of coolant. This allows the coolant to fill the gaps in the battery box and overflow from the outlet of the battery box, eliminating the need to install a liquid cooling plate at the bottom of the battery box, thus reducing costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the energy storage system of this utility model;

[0021] Figure 2 This is a schematic diagram of a partial structure of the battery box of this utility model;

[0022] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0023] Figure 4 This is a top view of a partial structure of the battery box of this utility model;

[0024] Figure 5 This is a schematic diagram of the circulating heat exchange of the dynamic submerged energy storage pipeline of this utility model.

[0025] Figure 6 This is a water temperature layout diagram obtained from simulation tests of the battery box of this utility model;

[0026] Figure 7 The graph shows the temperature difference over time as measured in the simulation test of the battery box of this utility model.

[0027] Figure 8 The graph shows the change of pressure difference over time as measured in the simulation test of the battery box of this utility model.

[0028] Reference numerals: 1. Battery box; 11. Battery box inlet; 12. Battery box outlet; 131. Second main inlet pipe; 132. Second branch inlet pipe; 14. Second outlet pipe; 141. Second horizontal outlet pipe; 142. Second vertical outlet pipe; 143. Overflow hole; 15. Groove; 21. First branch inlet pipe; 211. Pressure reducing valve; 212. Pressure gauge; 213. Flow meter; 22. First main inlet pipe; 221. Heater; 31. First branch outlet pipe; 32. First main outlet pipe; 321. Expansion tank; 322. Water pump; 4. Heat exchange mechanism; 41. Heat exchanger; 42. Expansion valve; 43. Condenser; 44. Compressor; 5. Liquid cooling unit. Detailed Implementation

[0029] To further understand the utility model's content, features, and effects, the following embodiments are provided, along with accompanying drawings. Figures 1-8 The details are as follows.

[0030] like Figures 1-5 As shown, this utility model discloses a dynamic immersion energy storage pipeline, including multiple first inlet branch pipes 21 and first outlet branch pipes 31 arranged in parallel outside the battery box inlet 11.

[0031] Multiple first liquid inlet branch pipes 21 are connected to the first liquid inlet main pipe 22, and multiple first liquid outlet branch pipes 31 are connected to the first liquid outlet main pipe 32. The coolant in the first liquid outlet main pipe 32 flows back into the first liquid inlet main pipe 22 through the heat exchange mechanism 4 to complete one cycle. The first liquid inlet main pipe 22, the first liquid outlet main pipe 32 and the heat exchange mechanism 4 are installed in the liquid cooling unit 5.

[0032] A pressure reducing valve 211 is provided on the first liquid inlet branch pipe 21, and a pressure gauge 212 and a flow meter 213 are provided between the pressure reducing valve 211 and the liquid inlet 11 of the battery box.

[0033] This invention utilizes multiple parallel first inlet branch pipes located outside the battery box's liquid inlet and first outlet branch pipes located outside the battery box's liquid outlet. A pressure reducing valve is installed on each inlet pipe to lower the pressure in the pipes of each battery module, ensuring a consistent flow of coolant into each battery box. This minimizes temperature differences in the coolant within each battery module and effectively reduces the structural strength of the battery box cover, thus reducing its thickness. Furthermore, pressure gauges and flow meters are used to measure the pressure and flow rate of the coolant at the battery box's liquid inlet. Finally, by placing the first inlet and first outlet main pipes within the liquid cooling unit, the length of the first inlet and first outlet branch pipes is reduced, saving costs.

[0034] In this embodiment, as Figure 5 The diagram shows a circulating heat exchange of a dynamic submerged energy storage pipeline, where PACK is the battery box 1. The heat exchange mechanism 4 includes a heat exchanger 41, an expansion valve 42, a condenser 43 and a compressor 44 arranged in sequence. The upper and lower ends of the heat exchanger 41 are connected to the first liquid outlet main pipe 32 and the first liquid inlet main pipe 22, respectively.

[0035] In this embodiment, as Figures 2-4As shown, the lower end of the battery box 1 is provided with a second main inlet pipe 131 connected to the battery box inlet port 11 along the width direction. The second main inlet pipe 131 is divided into multiple second branch pipes 132 arranged parallel to each other along the length direction of the battery box 1. There is a gap between the outlet of the second branch pipe 132 and the end plate of the battery box 1, so that the coolant can flow into the interior of the battery box 1 from the right end of the second branch pipe 132 and immerse the battery cells in coolant. Each second branch pipe 132 is located below a single battery cell, and there is a gap between two adjacent battery cells for coolant to flow. The upper end of the battery box 1 is provided with a second outlet pipe 14, which is connected to the first outlet branch pipe 31.

[0036] In this embodiment, as Figure 3 As shown, the second liquid outlet pipe 14 includes a horizontally arranged second liquid outlet horizontal pipe 141 and a vertically arranged second liquid outlet vertical pipe 142. The top end of the second liquid outlet horizontal pipe 141 is provided with multiple overflow holes 143. When the pressure reducing valve 211 is opened slightly, more coolant will flow into the battery pack. When the coolant in the battery pack exceeds the height of the overflow holes 143, the excess coolant will flow through the overflow holes 143, the second liquid outlet horizontal pipe 141 and the second liquid outlet vertical pipe 142 in sequence to the first liquid outlet branch pipe 31.

[0037] In this embodiment, as Figure 4 As shown, the bottom surface of the battery box 1 is provided with multiple grooves 15 along the length direction to accommodate the second liquid inlet branch pipe 132, which can save overall space.

[0038] In this embodiment, a heat insulation pad is provided in the gap between two adjacent cells to better dissipate heat. At the same time, the gap between two adjacent cells can also allow coolant to flow, allowing it to flow from the rightmost end of the battery pack to the overflow hole 143 at the leftmost end.

[0039] In this embodiment, as Figure 1 As shown, the battery box inlet 11 and the battery box outlet 12 are located at the same end of the battery box 1, which facilitates the arrangement of the first inlet branch pipe 21 and the first outlet branch pipe 31.

[0040] In this embodiment, as Figure 5 As shown, the first liquid outlet main pipe 32 is equipped with an expansion tank 321 for stabilizing the cooling hydraulic pressure and a water pump 322 for pressurizing, which can stabilize the entire liquid outlet circuit.

[0041] In this embodiment, as Figure 5 As shown, a heater 221 for heating the coolant is provided on the first liquid inlet manifold 22, and the water pump 322 and the heater 221 are connected through a heat exchanger 41.

[0042] In this embodiment, as Figures 6-8 The diagram shows data obtained from a simulation test of a single battery pack. The temperature of the NTC (thermistor) is used as the basis for judging the battery temperature. A maximum temperature between 30 and 35°C indicates a successful test. The maximum temperature difference during the test is approximately 1.7 to 3.0°C, indicating a successful test. Furthermore, the pressure difference of the entire battery module is maintained within 2.5 kPa, indicating a successful test, and the simulated pressure of the entire system is less than 102.5 kPa.

[0043] This utility model also provides an energy storage system, including the above-mentioned dynamic submersible energy storage pipeline.

[0044] The above-described utility model only illustrates the implementation methods of the present utility model and should not be construed as limiting the scope of the utility model patent, nor is it a limitation on the structure of the present utility model embodiments in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present utility model embodiments, and these all fall within the protection scope of the present utility model embodiments.

Claims

1. A dynamic submerged energy storage pipeline, characterized by: It includes multiple parallel first inlet branch pipes (21) arranged outside the battery box inlet (11) and first outlet branch pipes (31) arranged outside the battery box outlet (12); Multiple first liquid inlet branch pipes (21) are connected to the first liquid inlet main pipe (22), and multiple first liquid outlet branch pipes (31) are connected to the first liquid outlet main pipe (32). The coolant in the first liquid outlet main pipe (32) flows back into the first liquid inlet main pipe (22) through the heat exchange mechanism (4) to complete one cycle. The first liquid inlet main pipe (22), the first liquid outlet main pipe (32) and the heat exchange mechanism (4) are installed in the liquid cooling unit (5). A pressure reducing valve (211) is provided on the first inlet branch pipe (21), and a pressure gauge (212) and a flow meter (213) are provided between the pressure reducing valve (211) and the battery box inlet (11).

2. A dynamic submerged energy storage pipeline according to claim 1, characterized in that: The heat exchange mechanism (4) includes a heat exchanger (41), an expansion valve (42), a condenser (43), and a compressor (44) arranged in sequence, wherein the upper and lower ends of the heat exchanger (41) are connected to the first liquid outlet manifold (32) and the first liquid inlet manifold (22), respectively.

3. A dynamic immersed energy storage pipeline according to claim 1, wherein: The lower end of the battery box (1) is provided with a second liquid inlet main pipe (131) connected to the liquid inlet (11) of the battery box along the width direction. The second liquid inlet main pipe (131) is divided into multiple second liquid inlet branch pipes (132) arranged parallel to the length direction of the battery box (1). There is a gap between the outlet of the second liquid inlet branch pipe (132) and the end plate of the battery box (1). Each second liquid inlet branch pipe (132) is located below a single battery cell. There is a gap between two adjacent battery cells for the flow of coolant. The upper end of the battery box (1) is provided with a second liquid outlet pipe (14), which is connected to the first liquid outlet branch pipe (31).

4. A dynamic submerged energy storage pipeline according to claim 3, wherein: The second liquid outlet pipe (14) includes a horizontally arranged second liquid outlet horizontal pipe (141) and a vertically arranged second liquid outlet vertical pipe (142). The top end of the second liquid outlet horizontal pipe (141) is provided with a plurality of overflow holes (143). The coolant passes through the overflow holes (143), the second liquid outlet horizontal pipe (141) and the second liquid outlet vertical pipe (142) in sequence and flows to the first liquid outlet branch pipe (31).

5. A dynamic immersed energy storage pipeline according to claim 3, wherein: The bottom surface of the battery box (1) is provided with multiple grooves (15) along the length direction to accommodate the second liquid inlet branch pipe (132).

6. A dynamic submerged energy storage pipeline according to claim 3, wherein: A heat insulation pad is installed in the gap between two adjacent battery cells.

7. A dynamic submerged energy storage pipeline according to claim 1, wherein: The battery box inlet (11) and the battery box outlet (12) are located at the same end of the battery box (1).

8. A dynamic submerged energy storage pipeline according to claim 1, characterized in that: The first liquid outlet manifold (32) is equipped with an expansion tank (321) for stabilizing the cooling hydraulic pressure and a water pump (322) for pressurizing.

9. A dynamic submerged energy storage pipeline according to claim 1, characterized in that: A heater (221) for heating the coolant is provided on the first liquid inlet manifold (22).

10. An energy storage system characterized by: Including the dynamic submerged energy storage pipeline as described in any one of claims 1 to 9.

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