A type of flow-type immersion liquid-cooled energy storage battery pack

Abstract

This utility model belongs to the field of energy storage technology, specifically relating to a flow-type immersion liquid-cooled energy storage battery pack. It includes a shell and several battery modules, which are arranged inside the shell at intervals. Heat exchange pipes are provided on both sides and the bottom of the battery modules. The liquid outlet and inlet of the heat exchange pipes extend to the outside of the shell for connection to an external heat exchange medium circulation device. The shell is filled with an insulating cooling medium, and an insulating cooling medium circulation device is provided inside the shell to drive the insulating cooling medium to flow within the shell. This utility model can improve the temperature uniformity and heat exchange efficiency of the insulating cooling medium, effectively transferring heat from the center of the battery modules and between the battery modules to the outside, ensuring the temperature uniformity of the battery modules.

Description

Technical Field

[0001] This utility model belongs to the field of energy storage technology, specifically relating to a flow-type immersion liquid-cooled energy storage battery pack. Background Technology

[0002] In the energy storage field, immersion coolant technology is widely used due to its high heat dissipation efficiency, high heat dissipation stability, and low heat dissipation cost. Immersion liquid-cooled energy storage battery packs involve directly immersing the battery modules in an insulating cooling medium. However, current methods generally employ a static approach, meaning the insulating cooling medium within the battery pack does not flow. Because of uneven battery heating, extremely high heat generation occurs at the battery tabs, leading to higher temperatures in the insulating cooling medium at these tabs, resulting in temperature stratification. Furthermore, heat from the center of the battery module is difficult to dissipate. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a flow-type immersion liquid-cooled energy storage battery pack that improves the temperature uniformity and heat exchange efficiency of the insulating cooling medium, and effectively conducts the heat at the center of the battery module and the heat between several battery modules to the outside, thus ensuring the temperature uniformity of the battery module.

[0004] The present invention includes a housing and several battery modules. The battery modules are disposed inside the housing and spaced apart. Heat exchange pipes are provided on both sides and at the bottom of the battery modules. The liquid outlet and liquid inlet of the heat exchange pipes extend to the outside of the housing for connection with an external heat exchange medium circulation device. The housing is filled with an insulating cooling medium and is equipped with an insulating cooling medium circulation device inside the housing to drive the insulating cooling medium to flow inside the housing.

[0005] Furthermore, the heat exchange pipeline includes several side heat exchange tubes and several bottom heat exchange tubes. The side heat exchange tubes are arranged on both sides of the several battery modules along the interval direction of the several battery modules, and the several bottom heat exchange tubes are arranged on the bottom of the several battery modules. One end of the several side heat exchange tubes is connected to the several bottom heat exchange tubes, and the other end of the several side heat exchange tubes is arranged in parallel. A branch pipe one is arranged in this parallel area. The other end of the several bottom heat exchange tubes is arranged in parallel. A branch pipe two is arranged in this parallel area. The branch pipe one and the branch pipe two form the liquid outlet end and the liquid inlet end of the heat exchange pipeline.

[0006] Furthermore, the heat exchange pipeline also includes a horizontal pipe one and a horizontal pipe two. The other ends of several side heat exchange pipes are connected to the horizontal pipe one to form a parallel connection. The branch pipe one is located in the middle of the side of the horizontal pipe one. The other ends of several bottom heat exchange pipes are connected to the horizontal pipe two to form a parallel connection. The branch pipe two is located in the middle of the side of the horizontal pipe two.

[0007] Furthermore, heat dissipation fins are provided on the sides of several side heat exchange tubes and several bottom heat exchange tubes.

[0008] Furthermore, several side heat exchange tubes and several bottom heat exchange tubes are arranged in a serpentine pattern.

[0009] Furthermore, the bottom of a single battery module is supported by two support bars on the inner bottom surface of the housing. The two support bars are spaced apart to create a gap between the bottom of the battery module and the inner bottom surface of the housing, allowing the passage of insulating cooling medium and the installation of the bottom heat exchange tube.

[0010] Furthermore, the insulating cooling medium circulation device includes a circulation pump and a circulation pipe, one end of the circulation pump is connected to one end of the circulation pipe, the other end of the circulation pump and the other end of the circulation pipe face different directions and / or the circulation pump and the circulation pipe are located on different sides of several battery modules.

[0011] Furthermore, the circulation tube is arranged in a serpentine shape, and through holes are provided on the side of the circulation tube.

[0012] Furthermore, there are two insulating cooling medium circulation devices, which are arranged symmetrically.

[0013] Furthermore, each battery module comprises several batteries, which are separated by spacers and are circumferentially fixed by fixing strips.

[0014] The beneficial effects of this utility model are that it enables the insulating cooling medium to flow throughout the interior of the casing and across all surfaces of the battery module, increasing the contact area between the insulating cooling medium and the battery module. Combined with the arrangement of heat exchange pipelines, it can improve the temperature uniformity and heat exchange efficiency of the insulating cooling medium inside the casing. The heat at the center of the battery module and the heat between several battery modules can be effectively conducted outward, thereby effectively dissipating heat from the battery module, ensuring the temperature uniformity of the battery module, avoiding the problem of excessively high overall temperature and large temperature difference in the battery module, and helping to improve the performance and lifespan of the battery module. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the flow-type immersion liquid-cooled energy storage battery pack of this utility model.

[0016] Figure 2 This is an exploded structural diagram of the first embodiment of the flow-type immersion liquid-cooled energy storage battery pack of this utility model.

[0017] Figure 3 This is a schematic diagram of the heat exchange pipeline of this utility model.

[0018] Figure 4This is an exploded structural diagram of the heat exchange pipeline of this utility model.

[0019] Figure 5 This is an exploded structural diagram of the first embodiment of the insulating cooling medium circulation device of this utility model.

[0020] Figure 6 This is an exploded structural diagram of the second embodiment of the flow-type immersion liquid-cooled energy storage battery pack of this utility model.

[0021] Figure 7 This is an exploded structural diagram of the second embodiment of the insulating cooling medium circulation device of this utility model.

[0022] In the diagram: 1. Outer shell; 11. Base plate; 12. Top cover; 2. Battery module; 21. Fixing strip; 3. Heat exchange pipes; 31. Side heat exchange pipes; 32. Bottom heat exchange pipes; 33. Horizontal pipe one; 34. Horizontal pipe two; 35. Branch pipe one; 36. Branch pipe two; 37. Heat dissipation fins; 4. Insulating cooling medium circulation device; 41. Circulation pump; 42. Circulation pipe; 421. Through hole; 5. Support strip. Detailed Implementation

[0023] like Figures 1-7 As shown, this utility model provides a flow-type immersion liquid-cooled energy storage battery pack, including a shell 1 and several battery modules 2. The battery modules 2 are disposed inside the shell 1, spaced apart, i.e., there is a gap between adjacent battery modules 2. Heat exchange pipes 3 are provided on both sides and at the bottom of the battery modules 2. The liquid outlet and inlet of the heat exchange pipes 3 extend to the outside of the shell 1 for connection to an external heat exchange medium circulation device. Under the action of the external heat exchange medium circulation device, the heat exchange medium flows along the heat exchange pipes 3. This heat exchange medium can be R134a refrigerant or other media. The shell 1 is filled with an insulating cooling medium, and an insulating cooling medium circulation device 4 is provided inside the shell 1 to drive the insulating cooling medium to flow inside the shell 1.

[0024] Based on the above configuration, the insulating cooling medium can flow throughout the interior of the outer casing 1 and across all surfaces of the battery module 2, increasing the contact area between the insulating cooling medium and the battery module 2. Combined with the heat exchange pipeline 3, this improves the temperature uniformity and heat exchange efficiency of the insulating cooling medium inside the outer casing 1. The heat at the center of the battery module 2 and the heat between several battery modules 2 can be effectively conducted outward, thereby effectively dissipating heat from the battery module 2, ensuring the temperature uniformity of the battery module 2, and avoiding problems such as excessively high overall temperature and large temperature differences in the battery module 2. This is beneficial for improving the performance and lifespan of the battery module 2.

[0025] In one embodiment of this invention, the heat exchange pipes 3 located on the side and bottom of the battery module 2 are independently configured.

[0026] In a preferred embodiment of this invention, the heat exchange pipe 3 includes several side heat exchange pipes 31 and several bottom heat exchange pipes 32. The side heat exchange pipes 31 are arranged on both sides of the battery modules 2 along the interval direction of the battery modules 2, and the bottom heat exchange pipes 32 are arranged on the bottom of the battery modules 2. The number of side heat exchange pipes 31 is one more than the number of battery modules 2. The side heat exchange pipes 31 and battery modules 2 are staggered, and adjacent sides of the battery modules 2 share the same side heat exchange pipe 31. See details for further information. Figure 2 and Figure 3 As shown, when there are four battery modules 2, there are five side heat exchange pipes 31, of which three side heat exchange pipes 31 are arranged between the four battery modules 2, and the other two side heat exchange pipes 31 are located on the sides of the two outermost battery modules 2.

[0027] In the preferred configuration described above, several side heat exchange tubes 31 are connected at one end to several bottom heat exchange tubes 32, and the other ends of the side heat exchange tubes 31 are connected in parallel. A branch pipe 35 is provided in this parallel area. A branch pipe 36 is also provided in this parallel area. The branch pipe 35 and branch pipe 36 form the liquid outlet and liquid inlet of the heat exchange pipeline 3. The outer casing 1 has openings for the branch pipes 35 and 36 to pass through. Based on this configuration, several side heat exchange tubes 31 and several bottom heat exchange tubes 32 share the same liquid outlet and liquid inlet, reducing the number of liquid outlets and inlets, reducing the number of openings on the outer casing 1, and lowering the sealing difficulty. Among them, branch pipe 2 36 serves as the liquid inlet. Its position on the outer shell 1 is lower than branch pipe 2 36. The heat exchange medium enters along branch pipe 2 36, passes through horizontal pipe 2 34, bottom heat exchange pipe 32, side heat exchange pipe 31, horizontal pipe 1 33 in sequence, and then flows out along branch pipe 1 35.

[0028] In the above preferred configuration, the heat exchange pipeline 3 further includes a first horizontal pipe 33 and a second horizontal pipe 34. The other ends of several side heat exchange pipes 31 are connected to the first horizontal pipe 33 to form a parallel connection. A first branch pipe 35 is located in the middle of the side of the first horizontal pipe 33. The other ends of several bottom heat exchange pipes 32 are connected to the second horizontal pipe 34 to form a parallel connection. A second branch pipe 36 is located in the middle of the side of the second horizontal pipe 34. Since the temperature is higher closer to the center of the battery pack, this configuration not only ensures that the heat exchange medium flow rates of the bottom heat exchange pipes 32 and the side heat exchange pipes 31 in both the left and right sections are basically the same, but also allows the heat exchange medium to preferentially enter the bottom heat exchange pipes 32 and the side heat exchange pipes 31 located in the middle, ensuring that the heat exchange medium flow rates of the bottom heat exchange pipes 32 and the side heat exchange pipes 31 in the middle are the highest, thus improving the overall temperature uniformity of the battery pack.

[0029] Several side heat exchange tubes 31 and several bottom heat exchange tubes 32 are provided with heat dissipation fins 37 on their sides to increase the heat exchange area with the insulating cooling medium and further improve heat exchange efficiency. Preferably, the side heat exchange tubes 31 and several bottom heat exchange tubes 32 are arranged in a serpentine pattern to increase the coverage area of ​​the side heat exchange tubes 31 and bottom heat exchange tubes 32. Preferably, the thickness of the heat dissipation fins 37 is 1 mm, and adjacent heat dissipation fins 37 are spaced 10 mm apart axially along the tube segment they are in. When the side heat exchange tubes 31 and several bottom heat exchange tubes 32 are arranged in a serpentine pattern, such as Figure 4 As shown, the heat dissipation fins 37 are strip-shaped and have several through holes. In the early processing stage of the side heat exchange tube 31 and the bottom heat exchange tube 32, the strip-shaped heat dissipation fins 37 are sleeved on the parallel pipe section of the side heat exchange tube 31 or the bottom heat exchange tube 32 through several through holes.

[0030] Each battery module 2 is supported by two support bars 5 on the inner bottom surface of the outer casing 1. The two support bars 5 are spaced apart to create a certain height gap between the bottom of the battery module 2 and the inner bottom surface of the outer casing 1. This gap is greater than the diameter of the bottom heat exchange pipe 32, allowing the insulating cooling medium to pass through and facilitating the installation of the bottom heat exchange pipe 32 at the bottom of the battery module 2. This ensures that the insulating cooling medium can effectively pass through the bottom of the battery module 2 and prevents the battery module 2 from bearing weight through the bottom heat exchange pipe 32. Specifically, the outer casing 1 includes a base plate 11 and a top cover 12. Each battery module 2 is supported by two corresponding support bars 5 on the surface of the base plate 11. The surface of the base plate 11 is the inner bottom surface of the outer casing 1. The top cover 12 is placed on the base plate 11, and a sealed cavity is formed between the interior of the top cover 12 and the surface of the base plate 11.

[0031] The insulating cooling medium circulation device 4 includes a circulation pump 41 and a circulation pipe 42. One end of the circulation pump 41 is connected to one end of the circulation pipe 42, and the other end of the circulation pump 41 and the other end of the circulation pipe 42 face different directions and / or the circulation pump 41 and the circulation pipe 42 are located on different sides of several battery modules 2. Based on this arrangement, the insulating cooling medium is ensured to circulate in an orderly manner from one direction to another inside the housing 1.

[0032] In one embodiment of this utility model, such as Figure 2 and Figure 5 As shown, the circulation pipe 42 is an L-shaped pipe. The circulation pipe 42 and the circulation pump 41 are located on the same side of several battery modules 2. One end of the circulation pump 41 is connected to one end of the circulation pipe 42, and the other end of the circulation pump 41 and the other end of the circulation pipe 42 face different directions.

[0033] In another embodiment of this utility model, such as Figure 6 and Figure 7As shown, the circulation pipe 42 is arranged in a serpentine shape and is located on top of several battery modules 2. The circulation pump 41 is located on one side of several battery modules 2. One end of the circulation pipe 42 is bent downward and connected to the circulation pump 41. The side of the serpentine bending area of ​​the circulation pipe 42 is provided with a through hole 421 to enhance the circulation flow of the cooling medium and further improve the heat exchange efficiency.

[0034] In one embodiment of this utility model, such as Figure 2 and Figure 5 In the embodiment shown, the insulating cooling medium circulation device 4 is one unit. In another embodiment of this utility model, as... Figure 6 and Figure 7 In the embodiment shown, there are two insulating cooling medium circulation devices 4, which are arranged symmetrically.

[0035] In this invention, the circulation pump 41 is electrically connected to the battery module 2, and the battery module 2 supplies power to the circulation pump 41. Preferably, the circulation pump 41 is a DC micro pump; in other embodiments, the circulation pump 41 can also be any other pump that meets the usage requirements.

[0036] Each battery module 2 comprises several batteries, which are separated by spacers made of polycarbonate (PC) material with a thickness of 2mm. The batteries are circumferentially fixed by fixing strips 21.

[0037] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0038] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A flow-type immersion liquid-cooled energy storage battery pack, characterized in that, The device includes a housing (1) and several battery modules (2). The battery modules (2) are arranged inside the housing (1) and spaced apart. Heat exchange pipes (3) are provided on both sides and at the bottom of the battery modules (2). The liquid outlet and liquid inlet of the heat exchange pipes (3) extend to the outside of the housing (1) for connection with an external heat exchange medium circulation device. The housing (1) is filled with an insulating cooling medium, and an insulating cooling medium circulation device (4) is provided inside the housing (1) for driving the insulating cooling medium to flow inside the housing (1).

2. The flow-type immersion liquid-cooled energy storage battery pack as described in claim 1, characterized in that, The heat exchange pipeline (3) includes several side heat exchange pipes (31) and several bottom heat exchange pipes (32). The several side heat exchange pipes (31) are arranged on both sides of the several battery modules (2) along the interval direction of the several battery modules (2). The several bottom heat exchange pipes (32) are arranged at the bottom of the several battery modules (2). One end of the several side heat exchange pipes (31) is connected to one end of the several bottom heat exchange pipes (32). The other end of the several side heat exchange pipes (31) is arranged in parallel. A branch pipe one (35) is arranged in the parallel area. The other end of the several bottom heat exchange pipes (32) is arranged in parallel. A branch pipe two (36) is arranged in the parallel area. The branch pipe one (35) and the branch pipe two (36) form the liquid outlet end and the liquid inlet end of the heat exchange pipeline (3).

3. The flow-type immersion liquid-cooled energy storage battery pack as described in claim 2, characterized in that, The heat exchange pipeline (3) also includes a horizontal pipe one (33) and a horizontal pipe two (34). The other ends of several side heat exchange pipes (31) are connected to the horizontal pipe one (33) to form a parallel connection. The branch pipe one (35) is located in the middle of the side of the horizontal pipe one (33). The other ends of several bottom heat exchange pipes (32) are connected to the horizontal pipe two (34) to form a parallel connection. The branch pipe two (36) is located in the middle of the side of the horizontal pipe two (34).

4. The flow-type submerged liquid-cooled energy storage battery pack as described in claim 2 or 3, characterized in that, Several side heat exchange tubes (31) and several bottom heat exchange tubes (32) are provided with heat dissipation fins (37) on their sides.

5. The flow-type immersion liquid-cooled energy storage battery pack as described in claim 2 or 3, characterized in that, Several side heat exchange tubes (31) and several bottom heat exchange tubes (32) are arranged in a serpentine pattern.

6. The flow-type immersion liquid-cooled energy storage battery pack as described in any one of claims 1-3, characterized in that, The bottom of a single battery module (2) is supported by two support bars (5) on the inner bottom surface of the housing (1). The two support bars (5) are spaced apart so that a gap is formed between the bottom of the battery module (2) and the inner bottom surface of the housing (1) to allow the passage of insulating cooling medium and to install the bottom heat exchange tube (32).

7. The flow-type submerged liquid-cooled energy storage battery pack as described in any one of claims 1-3, characterized in that, The insulating cooling medium circulation device (4) includes a circulation pump (41) and a circulation pipe (42). One end of the circulation pump (41) is connected to one end of the circulation pipe (42), and the other end of the circulation pump (41) and the other end of the circulation pipe (42) are oriented in different directions and / or the circulation pump (41) and the circulation pipe (42) are located on different sides of several battery modules (2).

8. The flow-type immersion liquid-cooled energy storage battery pack as described in claim 7, characterized in that, The circulation tube (42) is arranged in a serpentine shape, and a through hole (421) is provided on the side of the circulation tube (42).

9. The flow-type immersion liquid-cooled energy storage battery pack as described in claim 7, characterized in that, There are two insulating cooling medium circulation devices (4), and the two insulating cooling medium circulation devices (4) are arranged symmetrically.

10. The flow-type immersion liquid-cooled energy storage battery pack as described in any one of claims 1-3, 8, and 9, characterized in that, Each battery module (2) comprises several batteries, which are separated by spacers and are circumferentially fixed by fixing strips (21).

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