A lightweight protective net for downhole lithium-ion battery power charging.

Abstract

This invention provides a lightweight protective net for downhole lithium-ion battery charging. The net includes: an explosion-proof sheet made of porous dielectric material to eliminate jet flames, block solid and liquid splashes, and isolate blast waves; an outer support net made of low-mesh steel mesh to support and connect the explosion-proof sheet; an inner protective net made of flexible high-mesh steel mesh coated with explosion-proof paint to initially block solid and liquid splashes and provide explosion protection; and a fixing hook that adjusts the effective size of the net by changing the position of the hole fitted into the fixing limit hole, and works in conjunction with a pre-embedded fixing device to fix the main body of the downhole lithium-ion battery charging protective net to the ground. When the protected lithium-ion battery explodes, the downhole lithium-ion battery charging protective net can effectively block solid and liquid splashes, extinguish flames, and isolate explosions, reducing the destructive power of the explosion and improving safety performance.

Description

Technical Field

[0001] This invention relates to the field of underground lithium-ion battery power charging and storage safety in coal mines, and more specifically, to a lightweight underground lithium-ion battery power charging protection net. Background Technology

[0002] In response to the policies of "double carbon", "double reduction" and green mining, and to solve the problems of insufficient power and serious exhaust pollution of traditional diesel engines, environmentally friendly and efficient battery power sources, represented by lithium-ion batteries, are gradually replacing traditional power sources such as diesel, and the market is broad.

[0003] Lithium-ion batteries have broad application prospects in underground coal mines. However, the combined effects of thermal runaway of lithium-ion batteries and the complex and harsh working environment of underground coal mines increase the risk of explosion and the potential for gas and coal dust explosions. The fire and explosion induced by thermal runaway during charging are particularly prominent, seriously threatening the lives and property of workers. To protect the safety of underground lithium-ion battery charging, a lightweight underground lithium-ion battery charging protection net was designed.

[0004] Chinese patents CN113067378A, CN215070309U, CN208422993U, CN206098507U, CN204885229U, CN211428956U, CN114583365A, and CN114744352A all describe explosion-proof devices for steel-structured lithium-ion battery power supplies. These devices are heavy, making them extremely inconvenient for relocation, daily use, and maintenance. Furthermore, their often enclosed design hinders heat dissipation during daily charging of the lithium-ion battery power supply. In the event of thermal runaway, the monitoring and fire suppression systems inside the external enclosure cannot directly affect the lithium-ion battery power supply within the enclosed enclosure, impacting emergency response effectiveness. Additionally, the small pressure relief vents in the enclosed enclosures mean that after an explosion, the large amount of gas inside the enclosure cannot be effectively discharged quickly enough to achieve timely pressure relief. Summary of the Invention

[0005] The main objective of this invention is to provide a lightweight underground lithium-ion battery charging protection net to reduce the destructive force of explosions caused by thermal runaway during charging or storage in coal mines, thereby improving safety. Simultaneously, it effectively avoids problems associated with existing patents, such as poor heat dissipation, slow pressure relief, bulkiness, and significant impact on external protective facilities.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A lightweight downhole lithium-ion battery power charging protection net, comprising:

[0008] The explosion-proof sheet is made of a porous medium material with excellent flame-retardant and explosion-proof effects. It is attached to the outer support net and plays the role of flame extinguishing, explosion-proofing and blocking solid and liquid splashes during the explosion.

[0009] An outer support mesh, made of low-mesh-count flexible steel mesh, is used to support and connect the explosion-proof sheet;

[0010] The inner protective net is made of high-mesh flexible steel mesh and coated with an explosion-proof coating, which serves as a preliminary barrier, flame extinguishing and explosion reduction function.

[0011] The tightening and fixing hook adjusts the size of the underground lithium-ion battery power charging protection net by changing the position of the hole fitted in the fixing limit hole, and is connected to the prefabricated fixing device on the ground, which plays a buffering and fixing role.

[0012] The explosion-proof sheet is attached to the outer support net, which is outside the inner protective net. The outer support net and the inner protective net are connected by welding along their edges. Flexible steel sheets with fixed limiting holes are extended and welded at the four corners of the net. Each corner has a fastening and fixing hook that is nested with the fixed limiting hole to complete the adjustment and fixation of the underground lithium-ion battery power charging protective net.

[0013] Furthermore, the specifications of the underground lithium-ion battery power supply charging protection net are adapted to the specifications of the underground lithium-ion battery power supply in coal mines and have size adjustment capabilities.

[0014] Furthermore, the outer support net and the inner protective net are tightly connected by welding at their edges and connected to a flexible stainless steel sheet with a fixed limiting hole, which is matched with a fastening and fixing hook.

[0015] Furthermore, the explosion-proof plates are reliably and evenly distributed at the nodes of the outer support mesh, and are reinforced in areas where enhanced protection is required.

[0016] Furthermore, the inner protective mesh is coated with a coating that has good explosion-proof effect.

[0017] Furthermore, the protruding limiting device of the tightening device of the tightening and fixing hook is used in conjunction with the fixing limiting hole. The size of the underground lithium-ion battery power charging protection net is adjusted by nesting the protruding limiting devices on the left and right sides of the tightening device with the fixing limiting holes on the adjacent sides of the net to ensure that it is suitable for the lithium-ion battery power being protected. After nesting, the outer edge of the fixing limiting hole is placed in the edge groove, and the main body of the underground lithium-ion battery power charging protection net is tightened through the mesh groove. After this operation is completed, the groove cover is added and the net is fixed and tightened by the limiting screw and the fixing nut.

[0018] Furthermore, the underground lithium-ion battery power supply charging protection net is fitted outside the lithium-ion battery power supply; in the event of thermal runaway explosion of the underground lithium-ion battery power supply, the explosion-proof sheet connecting the inner protective net and the outer support net plays a dual role in explosion protection, flame suppression, and blocking solid and liquid splashes.

[0019] Furthermore, the underground lithium-ion battery power supply charging protection net is not completely connected to the ground, and the charging line passes through the gap between the underground lithium-ion battery power supply charging protection net and the ground; during the charging process, the lithium-ion battery power supply is first connected to the charger, and then the lithium-ion battery power supply charging protection net is covered and tightened to ensure that it is reliably connected to the fixed device before power is turned on.

[0020] Beneficial effects:

[0021] Applying the technical solution of this invention, the underground lithium-ion battery power supply charging protection net provided by this invention comprises a main body consisting of an explosion-proof sheet, an outer support net, and an inner protective net, with a uniformly distributed grid communicating with the outside. The main body is secured and adjusted through the nesting of fixed limiting holes and converging fixing hooks to ensure its dimensions are suitable for the specifications of the protected lithium-ion battery power supply, and is connected to a pre-embedded device for secure fixation to the ground. During routine charging of the lithium-ion battery power supply, the porous medium and grid structure provide excellent heat dissipation. When the protected lithium-ion battery power supply experiences thermal runaway and explosion, the explosion-proof sheet and inner protective net can block solid and liquid splashes generated by the rupture of the protected lithium-ion battery power supply. Simultaneously, the porous structure of the explosion-proof sheet and the inner protective net provide dual protection against the explosion wave and extinguish the ejected flame. The grid on the surface of the inner protective net provides an outlet channel for the high-pressure gas generated by the explosion, allowing the internal pressure to stabilize rapidly. Ultimately, this achieves the goal of improving the safety of underground lithium-ion battery power supply charging and storage in coal mines. Attached Figure Description

[0022] The accompanying drawings of this invention are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 The schematic diagram shows the main plan view of the underground lithium-ion battery power charging protection net provided by the present invention;

[0024] Figure 2 This schematic diagram shows a cross-sectional view of the underground lithium-ion battery power charging protection net provided by the present invention after it has been assembled.

[0025] Figure 3The schematic diagram illustrates the assembly of the downhole lithium-ion battery power charging protection net's tightening and fixing hook, fixing limit hole, and prefabricated fixing device provided by the present invention.

[0026] The legend includes the following reference numerals:

[0027] 1. Explosion-proof sheet; 2. Outer support mesh; 3. Inner protective mesh; 4. Fixing and limiting hole; 5. Gathering and fixing hook; 51-Gathering device; 511-Mesh groove; 512-Protrusion limiting device; 513-Edge groove; 514-Groove cover; 515-Limiting screw; 516-Fixing nut; 52-Safety hook; 521-Lock body; 522-Locking device; 523-Free end; 53-Fixing chain hook; 6. Lithium-ion battery power supply; 7. Fixing device. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly, completely, and intuitively described below with reference to the accompanying drawings.

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] The present invention will be further described in detail below with reference to embodiments and specific implementation methods.

[0031] like Figures 1-3 As shown, the underground lithium-ion battery power charging protection net of the present invention includes an explosion-proof sheet 1, an outer support net 2, an inner protective net 3, a fixing limiting hole 4, and a convergence fixing hook 5. The explosion-proof sheet 1 is made of a porous medium material with excellent flame-retardant and explosion-proof effects, and is attached to the outer support net 2, serving to extinguish flames, reduce explosions, and block solid and liquid splashes during an explosion. The outer support net 2 is used to support and connect the explosion-proof sheet 1. The inner protective net 3 is made of high-mesh flexible steel mesh, coated with an explosion-proof coating, serving as a preliminary barrier, flame extinguisher, and explosion-proof agent. The protruding limiting device 512 on the convergence fixing hook 5 and the fixing limiting hole 4 form a nested structure for adjusting the size of the underground lithium-ion battery power charging protection net, and are connected to a pre-fabricated fixing device 7 on the ground, serving as a buffer and fixing agent. The porous design of the underground lithium-ion battery power charging protection net provides excellent explosion-proof, pressure relief, heat dissipation and cooling functions, and allows external monitoring and extinguishing agents to directly act on the lithium-ion battery power supply device 6.

[0032] The explosion-proof sheet 1 is attached to the outer support net 2, which is located outside the inner protective net 3. The edges of the outer support net 2 and the inner protective net 3 are connected by welding. Flexible steel sheets with fixing and limiting holes 4 are welded to the four corners of the net. Each corner has a converging fixing hook 5, which is nested with the fixing and limiting hole 4 to complete the adjustment and fixing function of the underground lithium-ion battery power charging protective net.

[0033] Preferably, since the lithium-ion battery power supply 6 protected by the underground lithium-ion battery power supply charging protection net is essentially directly connected to the ground, the static electricity generated during the charging process can be conducted away in a timely manner. Therefore, there is no need to install facilities to conduct away static electricity on the underground lithium-ion battery power supply charging protection net.

[0034] Preferably, because the underground lithium-ion battery power supply charging protection net is used to cover the outside of the underground lithium-ion battery power supply 6 in coal mines to reduce the destructive impact of its rupture and explosion, its specifications should be compatible with the specifications of most commercially available underground lithium-ion battery power supplies 6 in coal mines. This underground lithium-ion battery power supply charging protection net also has a size adjustment function.

[0035] Preferably, the outer support net 2 includes a low-mesh flexible steel mesh, which is relative to the high-mesh flexible steel mesh in the inner protective net 3. Both the outer support net 2 and the inner protective net 3 can play a good protective role. The edges of the two are connected by welding, and a flexible steel sheet with a fixed limiting hole 4 is welded on. The size of the underground lithium-ion battery power charging protective net is adjusted in conjunction with the gathering device 51.

[0036] Preferably, one of each of the four corners of the underground lithium-ion battery charging protection net is installed to achieve the effect of convergence and fixation. The protruding limiting device 512 on the convergence device 51 is sized to match the fixing limiting hole 4. The size of the underground lithium-ion battery charging protection net is adjusted by nesting the protruding limiting devices 512 on the left and right sides of the convergence device 51 with the fixing limiting holes 4 on adjacent sides of the underground lithium-ion battery charging protection net, ensuring it is suitable for the protected lithium-ion battery power supply 6. After nesting, the outer edge of the fixing limiting hole 4 is placed in the edge groove 513, and the main body of the protection net is converged through the mesh groove 511. After this operation, the groove cover 514 is added, and the underground lithium-ion battery charging protection net is fixed and converged using the limiting screw 515 and the fixing nut 516.

[0037] Preferably, since the process involves charging lithium-ion batteries in underground coal mines, the connection between the charger and the lithium-ion battery power supply 6 is involved. The underground lithium-ion battery charging protection net is connected to the ground only through the safety hook 52 in the fastening hook 5 and the fixing device 7, providing sufficient redundant space for the connection line to pass through, thus connecting the charger to the lithium-ion battery power supply 6. The safety hook 52 and the fastening device 51 are reliably welded together with thickened welding strips to form a fixed chain structure 53. The specific method of connecting it to the fixing device 7 is to pass the locking body 521 of the safety hook 52 through the connecting strip of the fixing device 7, close the free end 523, and lock the locking device 522. It should also be noted that the charging device should be connected first, and then the underground lithium-ion battery charging protection net should be installed.

[0038] Preferably, in the event of thermal runaway of the lithium-ion battery, the mesh on the surface of the underground lithium-ion battery power supply charging protection net is sufficient to protect the lithium-ion battery power supply 6 from the original monitoring and fire-fighting equipment in the charging chamber or battery swapping chamber, without affecting the fire extinguishing effect.

[0039] Through the above methods, the underground lithium-ion battery power charging protection net provided by this invention, through the mesh structure of the explosion-proof sheet 1 and the inner protective net 3, can play a heat dissipation role during daily charging. In the event of thermal runaway or even explosion, the inner protective net 3 can initially attenuate and block the generated explosion wave, jet flame, and solid and liquid splashes; the mesh of the inner protective net 3 provides a channel for the high-pressure gas generated by the explosion to escape; and through the redundant design of the underground lithium-ion battery power charging protection net, a certain amount of space is provided within the net to buffer the gas pressure relief; the explosion-proof sheet 1 attached to the outer support net 2 can further block the generated explosion wave, jet flame, and solid and liquid splashes. This achieves the protective function. The underground lithium-ion battery charging protection net is used in conjunction with the fastening hook 5 and the fixing limit hole 4 to adjust the effective size of the underground lithium-ion battery charging protection net, and is connected to the fixing device 7 to reliably fix the underground lithium-ion battery charging net on the ground, ensuring the integrity and effectiveness of the underground lithium-ion battery charging protection net, and ultimately achieving the purpose of enhancing the safety of the lithium-ion battery power supply 6 during the charging and storage process in the coal mine.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., that can be made without departing from the inventive concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A lightweight protective net for charging downhole lithium-ion batteries, characterized in that, include: The explosion-proof sheet is made of a porous medium material with excellent flame-retardant and explosion-proof effects. It is attached to the outer support net and plays the role of flame extinguishing, explosion-proofing and blocking solid and liquid splashes during the explosion. An outer support mesh, made of low-mesh-count flexible steel mesh, is used to support and connect the explosion-proof sheet; The inner protective net is made of high-mesh flexible steel mesh and coated with an explosion-proof coating, which serves as a preliminary barrier, flame extinguishing and explosion reduction function. The tightening and fixing hook adjusts the size of the underground lithium-ion battery power charging protection net by changing the position of the hole fitted in the fixing limit hole, and is connected to the prefabricated fixing device on the ground, which plays a buffering and fixing role. The explosion-proof sheet is attached to the outer support net, which is outside the inner protective net. The outer support net and the inner protective net are connected by welding along their edges. Flexible steel sheets with fixed limiting holes are extended and welded at the four corners of the net. Each corner has a fastening and fixing hook that is nested with the fixed limiting hole to complete the adjustment and fixing of the underground lithium-ion battery power charging protection net. The protruding limiting device and the fixed limiting hole on the tightening and fixing hook form a nest to adjust the size of the underground lithium-ion battery power charging protection net, and are connected to the prefabricated fixing device on the ground, which plays a buffering and fixing role; the porous design of the underground lithium-ion battery power charging protection net can play a good role in explosion protection, pressure relief, heat dissipation and cooling, and allow external monitoring and fire extinguishing agents to directly act on the lithium-ion battery power device body. Each corner has a fastening hook that is nested with the fixing limit hole to complete the adjustment and fixing function of the underground lithium-ion battery power charging protection net; The protruding limiting devices and fixed limiting holes on the tightening device are sized to match. The size of the underground lithium-ion battery power charging protection net is adjusted by nesting the protruding limiting devices on the left and right sides of the tightening device with the fixed limiting holes on the adjacent sides, ensuring that it is suitable for the lithium-ion battery power being protected. After nesting, the outer edge of the fixed limiting hole is placed in the edge groove, and the main body of the protection net is tightened through the mesh groove. After this operation is completed, the groove cover is added, and the tightening and fixing of the underground lithium-ion battery power charging protection net is completed by using limiting screws and fixing nuts. The safety hook and the retraction device are reliably welded together with thickened welding rods to form a fixed chain structure. The specific way to connect the safety hook to the fixing device is to pass the locking body of the safety hook through the connecting strip of the fixing device, close the free end, and lock the locking device.

2. The lightweight downhole lithium-ion battery power charging protection net according to claim 1, characterized in that, The specifications of the underground lithium-ion battery power supply charging protection net are adapted to the specifications of underground lithium-ion battery power supplies in coal mines and have the ability to adjust the size.

3. A lightweight downhole lithium-ion battery power charging protection net according to any one of claims 1-2, characterized in that, The outer support net and the inner protective net are tightly connected by welding at their edges and connected to a flexible stainless steel sheet with fixed limiting holes, which are matched with the fastening and fixing hooks.

4. A lightweight downhole lithium-ion battery power charging protection net according to claim 3, characterized in that, The explosion-proof plates are reliably and evenly distributed at the nodes of the outer support mesh, and are reinforced in areas where enhanced protection is required.

5. A lightweight downhole lithium-ion battery power charging protection net according to claim 4, characterized in that, The inner protective mesh is coated with a coating that has good explosion-proof effect.

6. A lightweight downhole lithium-ion battery power charging protection net according to claim 5, characterized in that, The protruding limiting device of the described tightening and fixing hook is used in conjunction with the fixing limiting hole. The size of the underground lithium-ion battery power charging protection net is adjusted by nesting the protruding limiting devices on the left and right sides of the tightening device with the fixing limiting holes on the adjacent sides, ensuring that it is suitable for the lithium-ion battery power being protected. After nesting, the outer edge of the fixing limiting hole is placed in the edge groove, and the main body of the underground lithium-ion battery power charging protection net is tightened through the mesh groove. After this operation is completed, the groove cover is added, and the underground lithium-ion battery power charging protection net is fixed and tightened by the limiting screw and fixing nut.

7. A lightweight downhole lithium-ion battery power charging protection net according to claim 6, characterized in that, The underground lithium-ion battery power supply charging protection net is fitted outside the lithium-ion battery power supply; in the event of thermal runaway explosion of the underground lithium-ion battery power supply, the explosion-proof sheet connecting the inner protective net and the outer support net plays a dual role in explosion protection, flame suppression, and blocking solid and liquid splashes.

8. A lightweight downhole lithium-ion battery power charging protection net according to claim 7, characterized in that, The underground lithium-ion battery power supply charging protection net is not completely connected to the ground. The charging line passes through the gap between the underground lithium-ion battery power supply charging protection net and the ground. During the charging process, the lithium-ion battery power supply is first connected to the charger, and then the underground lithium-ion battery power supply charging protection net is covered and tightened to ensure that it is reliably connected to the fixed device before power is turned on.

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