Fully-immersed lithium battery energy storage pack

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a fully-immersed lithium battery energy storage pack. The fully-immersed lithium battery energy storage pack comprises a box body, a box cover, a battery pack, a perforated plate and a condensation assembly, an opening is formed in the top of the box body, the box cover is arranged at the opening and is in sealing connection with the box body, a sealing cavity is defined by the box cover and the box body, and soaking liquid is contained in the box body and can be vaporized at a preset temperature; the plurality of battery packs are arranged in the box body at intervals, an X channel and a Y channel are formed among the plurality of battery packs, and the battery packs are immersed in the soaking liquid; the perforated plate is arranged between each row of battery packs, and through holes in the perforated plate form an X channel; and a gas pipeline and a liquid pipeline are communicated between the condensation assembly and the sealing cavity, so that the soaking liquid in the box body enters the condensation assembly through the gas pipeline to be condensed after being gasified, and the condensed liquid flows back to the box body through the liquid pipeline. The utility model is favorable for improving the cooling effect and the temperature consistency of the battery pack.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a fully submerged lithium battery energy storage pack. Background Technology

[0002] In related technologies, fully submerged energy storage batteries are cooled by immersing the entire battery in a coolant. This method typically relies on unidirectional cooling, which primarily absorbs sensible heat and cannot quickly absorb the heat generated by the battery, thus limiting the cooling effect. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a fully submerged lithium battery energy storage pack, which is beneficial for improving cooling efficiency and battery pack temperature consistency.

[0004] This utility model embodiment of a fully submerged lithium battery energy storage pack includes: a housing and a cover. The top of the housing has an opening, and the cover is located at the opening and sealed to the housing. The cover and the housing form a sealed cavity, and the housing contains an immersion liquid that can vaporize at a preset temperature; multiple battery packs are arranged alternately in the housing, forming X-channels and Y-channels between them, and the immersion liquid submerges the battery packs; a perforated plate is disposed between each row of battery packs, and through holes on the perforated plate form the X-channels; and a condensation assembly is connected to the sealed cavity by a gas pipeline and a liquid pipeline, so that the vaporized immersion liquid in the housing enters the condensation assembly through the gas pipeline for condensation, and the condensed liquid flows back to the housing through the liquid pipeline.

[0005] Understandably, placing the battery pack in an immersion liquid within the casing allows for heat exchange between the battery pack and the immersion liquid. When the immersion liquid reaches its boiling point, it vaporizes. The vaporized liquid, under buoyancy, rises through a gas pipe to the condenser assembly. The condenser assembly condenses the gas back into liquid and returns it to the casing through a return pipe to continue cooling the battery pack. The immersion liquid and battery pack surfaces are in full contact, and the continuous circulation of the immersion liquid with the condenser assembly effectively removes the heat generated by the battery pack, improving cooling efficiency and temperature stability. Furthermore, by creating a Y-channel between adjacent rows of battery packs, the battery packs can maintain full contact with the immersion liquid, and the vaporized liquid floats upwards along the Y-channel. Similarly, creating an X-channel between adjacent rows of battery packs, formed by a perforated plate, restricts the flow of vaporized liquid in the X-direction without affecting its flow within the X-channel, thus improving the buoyancy efficiency of the vaporized liquid and consequently enhancing cooling efficiency.

[0006] In this embodiment, the distance between two adjacent rows of battery packs is 3mm to 5mm.

[0007] In this embodiment, the diameter of the through hole is 3mm to 9mm.

[0008] In this embodiment, the fully submerged lithium battery energy storage pack also includes a heating element, which is disposed at the bottom of the housing and is used to heat the immersion liquid.

[0009] In this embodiment, the condensation assembly includes: a heat exchange component, which includes a heat exchange box and a heat exchange tube. The heat exchange box has a heat exchange cavity. Both ends of the gas pipeline are respectively connected to the heat exchange cavity and the sealing cavity. Both ends of the liquid pipeline are respectively connected to the heat exchange cavity and the sealing cavity. The heat exchange tube is located inside the heat exchange cavity. A refrigeration unit is also included. The outlet of the refrigeration unit is connected to the inlet of the heat exchange tube, and the return port of the heat exchange tube is connected to the inlet of the refrigeration unit.

[0010] In this embodiment, the fully submerged lithium battery energy storage pack also includes a pressure gauge, which is disposed on the cover and is used to detect the pressure inside the sealed cavity.

[0011] In this embodiment, the fully submerged lithium battery energy storage pack also includes a pressure relief valve, which is disposed on the cover to relieve pressure on the sealed cavity.

[0012] In this embodiment, the fully submerged lithium battery energy storage pack also includes a viewing window, which is disposed on the cover to allow observation of the interior of the sealed cavity.

[0013] In this embodiment, the fully submerged lithium battery energy storage pack also includes a temperature sensor, which is disposed inside the housing.

[0014] In this embodiment, the fully submersible lithium battery energy storage pack also includes a level gauge, which is disposed inside the tank. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a fully submerged lithium battery energy storage pack according to an embodiment of the present invention.

[0016] Figure label:

[0017] 1. Housing; 101. First flange; 2. Cover; 201. Second flange; 3. Battery pack; 4. Perforated plate; 5. Condensation assembly; 501. Heat exchange component; 5011. Heat exchange box; 5012. Heat exchange tube; 502. Refrigeration unit; 6. Sealed cavity; 7. Immersion liquid; 8. X channel; 9. Y channel; 10. Gas pipeline; 11. Liquid pipeline; 12. Heating element; 13. Pressure gauge; 14. Pressure relief valve; 15. Viewing window; 16. Temperature sensor; 17. Level gauge; 18. Alarm. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] In this embodiment, as Figure 1 As shown, the fully submerged lithium battery energy storage pack includes a housing 1, a cover 2, battery packs 3, a perforated plate 4, and a condensation assembly 5. The top of the housing 1 is open, and the cover 2 is located at the open and sealed to the housing 1. The cover 2 and the housing 1 form a sealed cavity 6. The housing 1 contains an immersion liquid 7, which can vaporize at a preset temperature. Multiple battery packs 3 are arranged alternately inside the housing 1, forming X-channels 8 and Y-channels 9 between them. The immersion liquid 7 submerges the battery packs 3. The perforated plate 4 is located between each row of battery packs 3, and the through holes on the perforated plate 4 form X-channels 8. A gas pipe 10 and a liquid pipe 11 connect the condensation assembly 5 and the sealed cavity 6, so that the vaporized immersion liquid 7 in the housing 1 enters the condensation assembly 5 through the gas pipe 10 for condensation, and the condensed liquid flows back to the housing 1 through the liquid pipe 11.

[0020] Specifically, such as Figure 1As shown, a first flange 101 is provided on the top of the enclosure 1, and a second flange 201, which matches and connects to the first flange 101, is provided on the bottom of the cover 2. The first flange 101 and the second flange 201 can be connected by bolts. For example, at least one of the two opposite end faces of the enclosure 1 and the cover 2 is provided with a sealing groove (not shown in the figure), and a sealing ring is provided in the sealing groove to achieve a sealed connection between the enclosure 1 and the cover 2 through the sealing ring. Of course, the cover 2 and the enclosure 1 can also achieve a sealed connection in other ways, which are not limited here. In summary, the enclosure 1 and the cover 2 are connected by the first flange 101 and the second flange 201 and sealed by the sealing ring, which can withstand high pressure and is easy to install and disassemble.

[0021] Specifically, the soaking liquid 7 needs to have a low boiling point, no flash point, and extremely low conductivity. Furthermore, the soaking liquid 7 should remain stable under high temperature and electrochemical environments and should not react adversely with battery materials. For example, the soaking liquid 7 can be one of the flame-retardant organic compounds such as hydrofluorocarbons, ketones, or ethers.

[0022] It is understandable that the battery pack 3 is placed in the immersion liquid 7 in the housing 1, and heat exchange occurs between the battery pack 3 and the immersion liquid 7. When the temperature of the immersion liquid 7 reaches its boiling point, the immersion liquid 7 vaporizes. Under the action of buoyancy, the vaporized immersion liquid 7 floats to the condenser 5 through the gas pipe 10. The condenser 5 condenses the gas into liquid and then flows back into the housing 1 through the return pipe to continue cooling the battery pack 3. The immersion liquid 7 and the surface of the battery pack 3 are in full contact, and the immersion liquid is constantly circulating and exchanging heat with the condenser 5, which can effectively remove the heat generated by the battery pack 3, which is beneficial to improving the cooling effect of the battery pack 3 and the temperature consistency of the battery pack 3. Furthermore, by setting a Y-channel 9 between two adjacent rows of battery packs 3, the battery packs 3 can be in full contact with the immersion liquid, and float upwards along the Y-channel 9 after the immersion liquid vaporizes. By setting an X-channel 8 between two adjacent rows of battery packs 3, the X-channel 8 is formed by a perforated plate 4. By setting the perforated plate 4, the flow of the immersion liquid 7 in the X direction after vaporization can be restricted, without affecting the flow of the immersion liquid 7 in the X-channel 8, which is beneficial to improving the floating efficiency of the immersion liquid 7 after vaporization, thereby improving the cooling efficiency.

[0023] In this embodiment, the distance between two adjacent battery packs 3 is 3mm to 5mm.

[0024] For example, the distance between two adjacent battery packs 3 can be 3mm, 3.5mm, 4mm, 4.5mm, or 5mm, etc. Those skilled in the art can choose to set the distance between two adjacent battery packs 3 according to actual operating conditions. If the distance between two adjacent battery packs 3 is too small, it increases the pressure resistance of the rising gas formed after the immersion liquid 7 liquefies, reduces the gas rising speed, and is not conducive to improving the cooling effect. If the distance between two adjacent battery packs 3 is too large, it will increase the overall size or reduce the number of battery packs 3.

[0025] Specifically, the distance between two adjacent battery packs 3 is the width of the Y channel 9 in the X direction. By setting the distance between two adjacent battery packs 3 to 3mm to 5mm, the rising speed of the immersion liquid 7 after vaporization is increased, and the space utilization rate is also improved.

[0026] In this embodiment, the diameter of the through hole is 3mm to 9mm.

[0027] For example, the diameter of the through hole can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm or 9mm, etc. If the diameter of the through hole is too large, it will increase the lateral flow of gas after the immersion liquid 7 vaporizes, which is not conducive to improving the gas rising efficiency. If the diameter of the through hole is too small, it will not be conducive to the flow of the immersion liquid 7, which will not be conducive to the temperature uniformity of the battery pack 3.

[0028] In this embodiment, by setting the diameter of the through hole to 3mm to 9mm, the gas flow after vaporization of the soaking liquid 7 is restricted to increase the gas buoyancy efficiency in the lateral direction, while ensuring the flow of the soaking liquid 7 in the X direction, which is beneficial to ensuring the temperature consistency of the battery pack 3.

[0029] In this embodiment, as Figure 1 As shown, the fully submerged lithium battery energy storage pack also includes a heating element 12, which is located at the bottom of the housing 1 and is used to heat the immersion liquid 7.

[0030] Specifically, the heating element 12 can be a copper sheet, and the heating element 12 is connected to a power source. The specific connection method between the heating element 12 and the power source is conventional existing technology and is not limited here.

[0031] It is understandable that by setting a heating element 12 inside the housing 1, the immersion liquid can be heated in a low-temperature environment, thereby raising the temperature of the battery pack 3 through the immersion liquid, so that the battery pack 3 can work in a low-temperature environment.

[0032] In this embodiment, as Figure 1As shown, the condensing assembly 5 includes a heat exchange component 501 and a refrigeration unit 502. The heat exchange component 501 includes a heat exchange box 5011 and heat exchange tubes 5012. The heat exchange box 5011 has a heat exchange cavity. The two ends of the gas pipeline 10 are respectively connected to the heat exchange cavity and the sealing cavity 6, and the two ends of the liquid pipeline 11 are respectively connected to the heat exchange cavity and the sealing cavity 6. The heat exchange tubes 5012 are located inside the heat exchange cavity. The outlet of the refrigeration unit 502 is connected to the inlet of the heat exchange tubes 5012, and the return port of the heat exchange tubes 5012 is connected to the inlet of the refrigeration unit 502.

[0033] The refrigeration unit 502 is conventional existing technology, and its specific composition and working principle will not be detailed here. The refrigeration unit 502 delivers coolant to the heat exchange tube 5012, and the cooled coolant after heat exchange flows back to the refrigeration unit 502, thus providing circulating coolant through the refrigeration unit 502. For example, the coolant can be one of water, refrigerant, or an aqueous solution of ethylene glycol.

[0034] Specifically, the heat exchanger is located above the cover. The bottom end of the gas pipe 10 is connected to the heat exchange box 5011, and the top end is connected to the cover 2. The top end of the liquid pipe 11 is connected to the heat exchange box 5011, and the bottom end is connected to the cover 2. The end of the gas pipe 10 inside the heat exchange box 5011 can be higher than the end of the liquid pipe 11 inside the heat exchange box 5011, so that the liquid inside the heat exchange box 5011 can flow into the box 1 from the liquid pipe 11. However, the outlet height of the gas pipe 10 is relatively high, so the liquid at the bottom of the heat exchange box 5011 will not enter the gas pipe 10.

[0035] When the soaking liquid 7 in the chamber 1 vaporizes to form gas, it enters the heat exchange chamber 5011 through the gas pipeline 10. The heat exchange tube 5012 in the heat exchange chamber 5011 exchanges heat with the gas. The gas liquefies upon cooling to form the soaking liquid 7. The soaking liquid 7 flows back into the chamber 1 through the liquid pipeline 11, realizing the circulation of the soaking liquid 7. Meanwhile, the coolant in the heat exchange tube 5012 exchanges heat and then flows back to the refrigeration unit 502 for recycling.

[0036] In this embodiment, as Figure 1 As shown, the fully submerged lithium battery energy storage pack also includes a pressure gauge 13, which is installed on the cover 2 and is used to detect the pressure inside the sealed cavity 6.

[0037] For example, pressure gauge 13 can be installed on the cover 2. An alarm 18 can also be installed on the cover 2. When excessive pressure is detected in the sealed cavity 6, the alarm 18 can sound an alarm so that the operator can obtain information in a timely manner.

[0038] It is understandable that by setting pressure gauge 13, the pressure information inside the sealing cavity 6 can be monitored in real time, so that timely action can be taken when the pressure inside the sealing cavity 6 is too high.

[0039] In this embodiment, as Figure 1 As shown, the fully submerged lithium battery energy storage pack also includes a pressure relief valve 14, which is disposed on the cover 2 to relieve pressure on the sealed cavity 6.

[0040] Specifically, the pressure relief valve can be installed on the cover 2 and connected to the exhaust pipe so that the gas in the sealed cavity 6 can be discharged through the exhaust pipe when the pressure relief valve 14 is opened.

[0041] It is understandable that by setting up a pressure relief valve, when the pressure in the sealed cavity 6 is too high, the pressure relief valve 14 can be opened to relieve pressure, which helps to ensure safety.

[0042] In this embodiment, as Figure 1 As shown, the fully submerged lithium battery energy storage pack also includes a viewing window 15, which is disposed on the cover 2 to allow observation of the interior of the sealed cavity 6.

[0043] For example, window 15 can be transparent glass.

[0044] By setting a viewing window 15 on the cover 2, the situation inside the box 1 can be easily observed through the viewing window 15, so as to make corresponding work adjustments according to the actual working conditions.

[0045] In this embodiment, as Figure 1 As shown, the fully submerged lithium battery energy storage pack also includes a temperature sensor 16, which is located inside the housing 1.

[0046] For example, temperature sensors 16 can be respectively installed for the top and bottom battery packs 3 to facilitate the acquisition of temperature information at different locations. Of course, those skilled in the art can adjust the number and location of the temperature sensors 16 as needed, and no limitation is imposed here.

[0047] It is understandable that by installing a temperature sensor 16 inside the housing 1, it is possible to obtain the temperature information inside the sealed cavity 6 in real time, thereby making timely adjustments to the work based on the temperature conditions inside the sealed cavity 6, and improving the safety of the work.

[0048] In this embodiment, as Figure 1 As shown, the fully submerged lithium battery energy storage pack also includes a level gauge 17, which is installed inside the housing 1.

[0049] Specifically, in the initial working state, half of the height of the level gauge 17 is below the immersion liquid 7. When the liquid level is lower than the level gauge 17, it can be determined that the amount of immersion liquid in the tank 1 is too small and there may be a leakage, so that the operator can deal with it in time.

[0050] By installing a level gauge 17 inside the tank 1, it is possible to obtain the real-time level information of the immersion liquid inside the tank 1, so that the operator can take appropriate action in a timely manner according to the level situation.

[0051] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0054] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A fully submersible lithium battery energy storage pack, characterized in that, include: The box body and the box lid are provided. The top of the box body is provided with an opening. The box lid is provided at the opening and is sealed to the box body. The box lid and the box body form a sealed cavity. The box body is filled with soaking liquid. The soaking liquid can vaporize at a preset temperature. A battery pack, wherein multiple battery packs are arranged at intervals in the housing, and X-channels and Y-channels are formed between the multiple battery packs, and the immersion liquid submerges the battery packs; A perforated plate is disposed between each column of the battery packs, and through holes in the perforated plate form the X-channel; A condensation assembly is provided, and a gas pipeline and a liquid pipeline are connected between the condensation assembly and the sealed cavity, so that the soaking liquid in the box is vaporized and enters the condensation assembly through the gas pipeline for condensation, and the condensed liquid flows back to the box through the liquid pipeline.

2. The fully submersible lithium battery energy storage pack according to claim 1, characterized in that, The distance between two adjacent rows of battery packs is 3mm to 5mm.

3. The fully submersible lithium battery energy storage pack according to claim 1, characterized in that, The diameter of the through hole is 3mm to 9mm.

4. The fully submersible lithium battery energy storage pack according to claim 1, characterized in that, It also includes a heating element, which is disposed at the bottom of the chamber and is used to heat the soaking liquid.

5. The fully submersible lithium battery energy storage pack according to claim 1, characterized in that, The condensation assembly includes: A heat exchange component, comprising a heat exchange box and heat exchange tubes, wherein the heat exchange box has a heat exchange cavity, both ends of the gas pipeline are respectively connected to the heat exchange cavity and the sealing cavity, both ends of the liquid pipeline are respectively connected to the heat exchange cavity and the sealing cavity, and the heat exchange tubes are located inside the heat exchange cavity; The refrigeration unit has its outlet connected to the inlet of the heat exchange tube, and the return water outlet of the heat exchange tube is connected to the inlet of the refrigeration unit.

6. The fully submersible lithium battery energy storage pack according to claim 1, characterized in that, It also includes a pressure gauge, which is installed on the cover of the chamber and is used to detect the pressure inside the sealed cavity.

7. The fully submersible lithium battery energy storage pack according to claim 1, characterized in that, It also includes a pressure relief valve, which is disposed on the cover of the chamber to relieve pressure on the sealed cavity.

8. The fully submersible lithium battery energy storage pack according to claim 1, characterized in that, It also includes a viewing window disposed on the box cover to allow observation of the interior of the sealed cavity.

9. The fully submersible lithium battery energy storage pack according to claim 1, characterized in that, It also includes a temperature sensor, which is disposed inside the enclosure.

10. The fully submersible lithium battery energy storage pack according to any one of claims 1 to 9, characterized in that, It also includes a level gauge, which is disposed inside the tank.

Images