A liquid immersion type lithium battery explosion-proof power supply

Abstract

The utility model provides a kind of liquid immersion type lithium battery explosion-proof power supply, including box, flange cover is detachably connected with fixed bolt in the top of box, partition is fixedly arranged in box, the space in box forms the battery cabin and the electrical cabin that do not communicate with each other in the both sides of partition, battery assembly is provided in battery cabin, electrical assembly for controlling battery assembly is provided in electrical cabin;Standardized plug-in electrical interface for realizing the electrical connection of battery cabin and electrical cabin is provided on the partition;Insulating liquid immersion layer and gas phase layer are provided in battery cabin and electrical cabin;Pressure relief fire barrier is provided on the box.The utility model sets up battery cabin and electrical cabin, double cabin structure is separated battery area and electrical area by physics, the insulation and non-combustible characteristics of immersion liquid can absorb heat and block arc when battery group generates thermal runaway or arc is born, play fire-fighting role, combined with the sealing explosion-proof and directional pressure relief performance of box ensure that the equipment runs safely and stably.

Description

Technical Field

[0001] This utility model relates to the field of battery box technology, and in particular to an explosion-proof power supply for liquid-immersed lithium batteries. Background Technology

[0002] With the large-scale application of energy storage, electric vehicles, coal mines, and intelligent mobile equipment (such as AGVs), the operational safety of lithium batteries, as a key energy unit, has received high attention. Traditional explosion-proof battery boxes mainly rely on overall explosion-proof or intrinsically safe designs, using metal shells combined with explosion-proof valves or gas arc-extinguishing devices to protect against thermal runaway and electrical faults. However, these solutions have revealed several shortcomings in practical applications: Firstly, when the battery pack experiences thermal runaway or a short circuit, high-temperature and high-pressure gas is rapidly generated inside. Traditional explosion-proof valves or movable pressure relief devices respond slowly and cannot release pressure in time, posing a risk of structural rupture. Secondly, the arc extinguishing speed of air or gaseous media is relatively slow, making it impossible to quickly cut off the fault circuit in the initial stage of arc generation, leading to heat and arc diffusion and causing secondary safety accidents. In addition, the co-location of the battery and control system in the same compartment makes maintenance difficult, often requiring a complete shutdown and opening of the enclosure during maintenance, increasing the risk of short circuits and affecting system operating efficiency.

[0003] To address the aforementioned issues, a novel battery box structure is needed that, while maintaining overall explosion-proof and electrical safety, enables rapid arc extinguishing, reliable pressure relief, and modular maintenance. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] To achieve the above objectives, this utility model proposes a liquid-immersed lithium battery explosion-proof power supply, including a housing with an opening at the top. A flange cover is detachably connected to the opening via bolts. A partition plate is fixedly installed inside the housing, forming a non-communicating battery compartment and an electrical compartment on both sides of the partition plate. The battery compartment houses battery components, and the electrical compartment houses electrical components for controlling the battery components. Multiple standardized pluggable electrical interfaces for electrical connection between the battery compartment and the electrical compartment are provided through the partition plate. Both the battery compartment and the electrical compartment are provided with an insulating liquid-immersed layer and a vapor phase layer. A pressure relief and flame arrestor is installed on the housing.

[0006] This utility model, by setting up a battery compartment and an electrical compartment, physically separates the battery area and the electrical area through a dual-compartment structure. The insulating and non-flammable properties of the immersion liquid can quickly absorb heat and block the arc when the battery pack experiences thermal runaway or the initial generation of an electric arc, thus playing a fire-fighting role. Combined with the sealed explosion-proof and directional pressure relief performance of the enclosure, it ensures the safe and stable operation of the equipment.

[0007] Optionally, the height of the insulating liquid immersion layer is set higher than the height of all components in the battery compartment and electrical compartment, and the height of the insulating liquid immersion layer satisfies the tilt angle being within the range of 0-35°, so that all electrical components in the battery compartment and electrical compartment are immersed in the insulating liquid immersion layer.

[0008] The vapor layer is formed above the insulating liquid immersion layer, and under normal conditions, the volume of the vapor layer is 5% to 40% of the internal space of the box.

[0009] Furthermore, the pressure relief and flame arrestor is located at the vapor phase layer position of the battery compartment on the side wall of the enclosure, and the pressure relief and flame arrestor is located close to the opening of the enclosure.

[0010] Furthermore, the flange cover is configured as a first cover and a second cover corresponding to the positions of the battery compartment and the electrical compartment, respectively. The first cover covers the battery compartment, and the second cover covers the electrical compartment. Both the first cover and the second cover are independently and detachably fixedly connected to the cover.

[0011] Furthermore, a sealing gasket is provided between the edge of the box opening and the flange cover.

[0012] Furthermore, the flange cover is provided with multiple handles on the side away from the box body, and the multiple handles are respectively located on the upper surface of the first cover body and the upper surface of the second cover body.

[0013] Furthermore, two sets of visible liquid level sight glasses are respectively installed on the side wall of the enclosure at the positions corresponding to the battery compartment and the electrical compartment.

[0014] Furthermore, reinforcing ribs are arranged around the side wall of the box.

[0015] Furthermore, multiple lifting and fixing seats are provided on the side wall of the box near the opening. The multiple lifting and fixing seats are symmetrically arranged on both sides of the box opening. Each lifting and fixing seat is provided with multiple threaded holes of different specifications to match various lifting connectors.

[0016] Furthermore, the side wall of the enclosure is provided with multiple fixed corner brackets near the bottom edge, and the bottom of the fixed corner brackets is provided with standardized mounting holes of various specifications.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 This is a schematic diagram of the overall structure of a liquid-immersed lithium battery explosion-proof power supply according to the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of a liquid-immersed lithium battery explosion-proof power supply according to the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Enclosure; 11. Battery compartment; 12. Electrical compartment; 13. Divider; 14. Standardized plug-in electrical interface; 15. Reinforcing rib; 16. Visual liquid level sight glass; 17. Lifting bracket; 18. Fixing bracket; 19. Immersion liquid drain port; 2. Battery assembly; 21. Battery cell; 22. Voltage and temperature acquisition sensor; 3. Electrical components; 4. Flange cover; 41. First cover; 42. Second cover; 43. Handle; 5. Insulating liquid immersion layer; 6. Vapor phase layer; 7. Pressure relief flame arrestor; 8. Sealing gasket. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0024] This utility model proposes an explosion-proof power supply for liquid-immersed lithium batteries, as detailed below. Figures 1 to 2 Please provide a detailed explanation.

[0025] An explosion-proof power supply for a liquid-immersed lithium battery includes a housing 1 with an opening at the top. A flange cover 4 is detachably connected to the opening of the housing 1 via fixing bolts. A partition plate 13 is fixedly installed inside the housing 1. The space inside the housing 1 forms a non-communicating battery compartment 11 and an electrical compartment 12 on both sides of the partition plate 13. A battery assembly 2 is installed in the battery compartment 11, and an electrical component 3 for controlling the battery assembly 2 is installed in the electrical compartment 12. Multiple standardized pluggable electrical interfaces 14 are provided through the partition plate 13 to realize electrical connection between the battery compartment 11 and the electrical compartment 12. Both the battery compartment 11 and the electrical compartment 12 are provided with an insulating liquid immersion layer 5 and a vapor phase layer 6. A pressure relief and flame arrestor 7 is installed on the housing 1.

[0026] This utility model, by setting up a battery compartment 11 and an electrical compartment 12, physically separates the battery area and the electrical area through a dual-compartment structure. The insulating and non-flammable properties of the immersion liquid can quickly absorb heat and block the arc when the battery pack experiences thermal runaway or the initial generation of an electric arc, thus playing a fire-fighting role. Combined with the sealing and explosion-proof performance and directional pressure relief performance of the enclosure 1, the safe and stable operation of the equipment is ensured.

[0027] In one embodiment, the electrical component 3 includes devices such as a data acquisition controller, circuit breaker, relay, fast fuse, and current transformer. The battery component 2 is a cuboid battery pack composed of multiple batteries connected in series. End plates are provided at both ends of the battery pack, which are bundled together with steel straps. The end plates are fixed to the connecting beam on the bottom wall of the housing 1. Each battery cell 21 facing the opening of the housing 1 is equipped with a voltage and temperature acquisition sensor 22. The positive and negative power lines from the series connection of the battery pack and the wiring harness of the voltage and temperature acquisition sensors 22 are electrically connected to the electrical component 3 through a standardized pluggable electrical interface 14. When maintenance personnel need to repair the battery component 2 or the electrical components, the dual-compartment isolation structure allows maintenance personnel to independently operate the electrical compartment 12 or the battery compartment 11 during maintenance, thereby reducing the risk of short circuits during the maintenance process.

[0028] In some embodiments, the height of the insulating liquid immersion layer 5 is higher than the height of all components in the battery compartment 11 and the electrical compartment 12, and the height of the insulating liquid immersion layer 5 satisfies the tilt angle being within the range of 0-35°. All electrical components in the battery compartment 11 and the electrical compartment 12 are immersed in the insulating liquid immersion layer 5, and the height of the insulating liquid immersion layer satisfies the tilt angle being within the range of 0-35°.

[0029] The vapor layer 6 is formed above the insulating liquid immersion layer 5, and under normal conditions, the volume of the vapor layer 6 is 5% to 40% of the internal space of the enclosure 1.

[0030] The immersion liquid in the insulating liquid immersion layer 5 is an insulating and non-flammable liquid. This immersion liquid can rapidly absorb heat when the battery pack experiences thermal runaway or the initial generation of an electric arc, achieving efficient arc extinguishing and arc breaking, and significantly reducing the damage of the electric arc to the battery pack and equipment. Furthermore, the reserved vapor layer 6 serves as a reserved expansion space, which can buffer the pressure generated in the event of an explosion inside the battery pack. In one embodiment, the vapor layer 6 is preferably 20% of the internal space of the housing 1 as expansion space.

[0031] In some embodiments, the pressure relief flame arrestor 7 is disposed on the side wall of the enclosure 1 at the location corresponding to the vapor layer 6 of the battery compartment 11, and the pressure relief flame arrestor 7 is disposed close to the opening of the enclosure 1. The pressure relief flame arrestor 7 is made of explosion-proof materials, such as cast aluminum or stainless steel, to ensure the airtightness of the enclosure 1. The device remains sealed under normal conditions and automatically opens when the internal pressure exceeds a threshold, achieving instantaneous directional pressure relief. In another embodiment, the pressure relief flame arrestor 7 can be disposed on the flange cover 4.

[0032] In some embodiments, two immersion liquid drain ports 19 are respectively provided at both ends of the housing 1. The two immersion liquid drain ports 19 are respectively the battery compartment 11 and the electrical compartment 12. Each immersion liquid drain port 19 is a threaded fixed self-closing quick-connect valve port. When it is necessary to drain the battery compartment 11 or the electrical compartment 12, the corresponding immersion liquid drain port 19 can be opened to complete the draining.

[0033] In some embodiments, the flange cover 4 is configured as a first cover 41 and a second cover 42 corresponding to the positions of the battery compartment 11 and the electrical compartment 12. The first cover 41 covers the battery compartment 11 and the second cover 42 covers the electrical compartment 12. Both the first cover 41 and the second cover 42 are independently and detachably fixedly connected to the cover.

[0034] The four-part flange cover design allows staff to perform individual maintenance on either the battery compartment 11 or the electrical compartment 12 within the housing 1. When maintenance is required on the battery compartment 11, the first cover 41 can be opened; when maintenance is required on the electrical compartment 12, only the second cover 42 needs to be opened.

[0035] In one embodiment, in order to ensure the airtightness of the battery compartment 11 and avoid the weak airtightness of the battery compartment 11 due to the gap of the connecting cover of the separate parts, the coverage area of ​​the first cover 41 is expanded to a part above the electrical compartment 12, and the coverage area of ​​the second cover 42 is adaptively reduced, and the area of ​​the first cover 41 covering the electrical compartment 12 is less than half of the area above the electrical compartment 12.

[0036] In some embodiments, a sealing gasket 8 is provided between the opening edge of the housing 1 and the flange cover 4. The sealing gasket 8 ensures a sealed connection between the flange cover 4 and the housing 1.

[0037] In some embodiments, the flange cover 4 is provided with a plurality of handles 43 on the side opposite to the housing 1, and the plurality of handles 43 are respectively provided on the upper surface of the first cover 41 and the upper surface of the second cover 42. The provision of the plurality of handles 43 facilitates the movement of the first cover 41 and the second cover 42 by the operator.

[0038] In some embodiments, two sets of visual liquid level sight glasses 16 are respectively provided on the side wall of the housing 1 at the positions corresponding to the battery compartment 11 and the electrical compartment 12. The visual liquid level sight glasses 16 are elongated and arranged along the direction perpendicular to the flange cover 4. The two sets of visual liquid level sight glasses 16 are located on the left and right sides directly in front. The liquid level height and the state inside the tank can be observed from the upper section of each set of visual liquid level sight glasses 16, and the lower section is used to view the operating status of the battery cell 21, the voltage and temperature acquisition sensor 22, and the electrical components 3.

[0039] In some embodiments, reinforcing ribs 15 are arranged around the side wall of the housing 1. The reinforcing ribs 15 can enhance the internal pressure-bearing capacity and resist the influence of external forces such as mechanical impact, compression, and collision. The reinforcing ribs 15 are distributed in the middle of the housing 1. In one specific embodiment, the reinforcing ribs 15 are made of 60×10mm flat steel and are distributed in a circle around the middle of the housing 1.

[0040] In some embodiments, a plurality of lifting fixing seats 17 are provided on the side wall of the housing 1 near the opening. The lifting fixing seats 17 are formed by casting. The plurality of lifting fixing seats 17 are symmetrically arranged on both sides of the opening of the housing 1, and the number of lifting fixing seats 17 is not less than four sets. In one embodiment, the number of lifting fixing seats 17 is four sets, which are distributed at the four corners of the housing 1. Each lifting fixing seat 17 is provided with a plurality of threaded holes of different specifications, wherein the threaded hole specifications are in the range of M14 to M16 (inclusive), to match various lifting connectors.

[0041] In some embodiments, a plurality of fixing brackets 18 are provided on the side wall of the housing 1 near the bottom edge. In one embodiment, four fixing brackets 18 are provided, symmetrically arranged on both sides of the housing 1. The bottom of the fixing brackets 18 is provided with standardized mounting holes of various specifications, including circular through holes and oblong holes. The housing 1 is installed on the equipment by bolts passing through the mounting holes, which can further enhance the installation stability of the housing 1.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 liquid-immersed lithium battery explosion-proof power supply, characterized in that, The enclosure includes a housing with an opening at the top. A flange cover is detachably connected to the opening via bolts. A partition plate is fixedly installed inside the housing, forming a non-communicating battery compartment and an electrical compartment on either side of the partition plate. The battery compartment houses battery components, and the electrical compartment houses electrical components for controlling the battery components. Multiple standardized pluggable electrical interfaces for electrical connection between the battery compartment and the electrical compartment are provided through the partition plate. Both the battery compartment and the electrical compartment are equipped with an insulating liquid immersion layer and a vapor phase layer. A pressure relief and flame arrestor is installed on the housing.

2. The explosion-proof power supply for a liquid-immersed lithium battery as described in claim 1, characterized in that, The height of the insulating liquid immersion layer is higher than the height of all components in the battery compartment and electrical compartment, and the height of the insulating liquid immersion layer satisfies the tilt angle within the range of 0-35°, so that all electrical components in the battery compartment and electrical compartment are immersed in the insulating liquid immersion layer. The vapor layer is formed above the insulating liquid immersion layer, and under normal conditions, the volume of the vapor layer is 5% to 40% of the internal space of the box.

3. The explosion-proof power supply for a liquid-immersed lithium battery as described in claim 1, characterized in that, The pressure relief and flame arrestor is located on the side wall of the enclosure at the gas phase layer corresponding to the battery compartment, and the pressure relief and flame arrestor is located close to the enclosure opening.

4. The explosion-proof power supply for a liquid-immersed lithium battery as described in claim 1, characterized in that, The flange cover is divided into a first cover and a second cover corresponding to the positions of the battery compartment and the electrical compartment. The first cover covers the battery compartment, and the second cover covers the electrical compartment. Both the first cover and the second cover are independently and detachably fixedly connected to the cover.

5. The explosion-proof power supply for a liquid-immersed lithium battery as described in claim 4, characterized in that, A sealing gasket is provided between the edge of the box opening and the flange cover.

6. The explosion-proof power supply for a liquid-immersed lithium battery as described in claim 4, characterized in that, The flange cover has multiple handles on the side away from the box body, and the multiple handles are respectively located on the upper surface of the first cover and the upper surface of the second cover.

7. The explosion-proof power supply for a liquid-immersed lithium battery as described in claim 1, characterized in that, Two sets of visible liquid level sight glasses are respectively installed on the side wall of the enclosure at the positions corresponding to the battery compartment and the electrical compartment.

8. The explosion-proof power supply for a liquid-immersed lithium battery as described in claim 1, characterized in that, The side walls of the box are surrounded by reinforcing ribs.

9. The explosion-proof power supply for a liquid-immersed lithium battery as described in claim 1, characterized in that, Multiple hoisting mounting seats are provided on the side wall of the box near the opening. The multiple hoisting mounting seats are symmetrically arranged on both sides of the box opening. Each hoisting mounting seat is provided with multiple threaded holes of different specifications to match various hoisting connectors.

10. The explosion-proof power supply for a liquid-immersed lithium battery as described in claim 1, characterized in that, The side wall of the enclosure is provided with multiple fixed corner brackets near the bottom edge, and the bottom of the fixed corner brackets is provided with standardized mounting holes of various sizes.

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