A nozzle for cooling the thermal runaway of a lithium battery pack in an electric vehicle

Abstract

The present invention belongs to the technical field of fire sprinklers and discloses a sprinkler for cooling the thermal runaway of an electric vehicle lithium battery pack. The sprinkler for cooling the thermal runaway of an electric vehicle lithium battery pack comprises a threaded main pipe, an inner pipe is sleeved inside the threaded main pipe, and a spray mechanism is provided at the top of the inner pipe; the spray mechanism comprises: an outer ring, fixedly connected to the top of the inner pipe; a top cover, which is provided at the top of the outer ring and closes the top opening of the outer ring; a spray main pipe assembly, which is provided on the top cover; and a spray branch pipe assembly, wherein several spray branch pipe assemblies are also provided on the top cover. The sprinkler for cooling the thermal runaway of an electric vehicle lithium battery pack can be composed of three or four sprinklers arranged in a single row to form a bottom spray assembly for cooling the thermal runaway of an electric vehicle lithium battery pack. This can provide full coverage cooling control for the lithium battery pack, which is convenient for rescue personnel to quickly and temporarily connect the bottom spray assembly to the chassis of the electric vehicle on site, and is also suitable for fixed installation in centralized parking spaces for electric vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of fire sprinklers, and in particular to a sprinkler for cooling a lithium battery pack in an electric vehicle in case of thermal runaway. Background Art

[0002] With the rapid development of new energy vehicles today, fire prevention and control of new energy vehicles has also been paid attention to. Most new energy vehicles on the market today are powered by lithium batteries. When a vehicle failure causes a fire, the fire develops more fiercely and more fiercely than that of a gasoline vehicle. Moreover, electric vehicle fires often occur during charging late at night and are not easy to be detected. Therefore, it is particularly important to cool the battery and control the fire in the early stage of an electric vehicle fire. The lithium battery pack of an electric vehicle is generally mounted on the chassis with a ground clearance of 120mm to 150mm, and the surface area of the lithium battery pack exceeds 2.5m2. The protection space is small and the protection area is large, making fire control particularly difficult.

[0003] The fire sprinklers currently installed in garages have a maximum protection angle of 120° for a single solid cone nozzle. They are equipped with blades or swirl cores inside, which are often only suitable for water spraying and will damage the output quality of the foam medium. Usually, multiple groups of sprinklers are required, arranged vertically and horizontally. These structures are large in size, require high operational intensity, and are not suitable for installation in fixed parking spaces. Therefore, after long-term investment and technical research, we have designed a sprinkler for cooling thermal runaway lithium battery packs in electric vehicles. Summary of the Invention

[0004] The purpose of the present invention is to provide a nozzle for cooling the thermal runaway of a lithium battery pack of an electric vehicle. The nozzle for cooling the thermal runaway of a lithium battery pack of an electric vehicle has a single nozzle with no blind spot protection angle ≥150°, and can perform full coverage cooling control on the lithium battery pack. It is beneficial for rescue personnel to temporarily and quickly connect the bottom spray assembly to the chassis of the electric vehicle on site, and is also suitable for fixed installation in centralized berths for electric vehicles (with small engineering modification volume and small interference surface with the vehicle).

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a nozzle for cooling thermal runaway of lithium battery packs in electric vehicles, comprising a threaded main pipe, an inner pipe is sleeved inside the threaded main pipe, and a spray mechanism is provided at the top of the inner pipe.

[0006] The injection mechanism comprises:

[0007] an outer ring fixedly connected to the top end of the inner tube;

[0008] A top cover is provided at the top of the outer ring and closes the top opening of the outer ring;

[0009] an injection main pipe assembly, wherein the injection main pipe assembly is arranged on the top cover;

[0010] A spray branch pipe assembly, several of which are also arranged on the top cover.

[0011] Preferably, the injection mechanism further includes an annular slot, the edge of the top cover is curled inward and inserted into the annular slot, and a limiting rubber ring is bonded between the outer ring and the top cover to limit the top cover and provide sealing.

[0012] Preferably, the injection pipe assembly includes a injection pipe, a connecting rod, a limiting ring and a rotating nozzle. The top end of the injection pipe is embedded in the middle of the top cover, the limiting ring is fixedly connected to the inner wall of the inner tube through the connecting rod, and the injection pipe is inserted into the limiting ring. The rotating nozzle is inserted into the insertion cavity at the top of the injection pipe. The position where the upper half of the injection pipe is exposed from the injection pipe is in the shape of an inverted frustum, and the top opening of the injection pipe is in the middle of the frustum.

[0013] Preferably, the injection branch pipe assembly includes a base, an adhesive groove, a protective film, a reverse thrust groove, a perforation, a jet branch pipe, a connecting ring and a limit spring. Several bases are embedded in the top cover. An adhesive groove is provided on the outside of the base. The protective film is fan-shaped. Several protective films are bonded in the adhesive groove and spliced into a whole circle. A reverse thrust cavity is provided in the middle of the adhesive groove. The middle part of the bottom wall of the reverse thrust cavity is connected to the inner part of the outer ring through a perforation. The injection branch pipe is inserted in the perforation. One end of the injection branch pipe points to the center position of the circle formed by splicing the protective films. The other end of the injection branch pipe is in the outer ring and is fixedly connected to the connecting ring. The connecting ring is connected to the inner wall of the top cover through a limit spring.

[0014] Preferably, a guide groove is provided on the inner wall of the threaded main pipe, and a guide ring is provided on the outer wall of the inner pipe and is slidably connected in the guide groove to guide the inner pipe.

[0015] Preferably, the bottom end of the inner tube is connected to the inner wall of the threaded main tube via a threaded rubber sleeve, and the guide ring is at the bottom of the guide groove when the threaded rubber sleeve is in a loose state.

[0016] Preferably, a side of the outer wall of the threaded main pipe away from the outer ring is not provided with threads and is provided with an entrance, and an end of the threaded main pipe away from the outer ring is closed.

[0017] Preferably, the rotating nozzle is movably connected to the inner wall of the injection main pipe through a bearing for rotation, and at least two driving holes are opened on the side wall of the rotating nozzle and above the injection main pipe. The driving holes are arranged in a ring with the central axis of the rotating nozzle as a reference, and the angle formed by the driving hole and the tangent of the injection main pipe is in the range of 30°-60°.

[0018] Preferably, the rotating nozzle is fixedly connected to a diffusion cover at the periphery of its top opening via a vertical rod, and the diffusion cover is trumpet-shaped and provided with a plurality of strip-shaped notches.

[0019] Preferably, the bottom openings of the injection branch pipe and the injection main pipe are both outward-flared, the end of the injection branch pipe pointing to the protective film is conical, and the opening is at the tip, and the side wall of the injection branch pipe is also provided with a plurality of injection holes arranged in a ring with the axis of the injection main pipe as a reference, and the outlet of the injection hole points to the inside of the top cover.

[0020] By adopting the above technical solution, the beneficial effects of the present invention are:

[0021] 1. The electric vehicle lithium battery pack thermal runaway cooling nozzle has a single nozzle with no blind spot protection angle ≥150°. Three or four nozzles arranged in a single row can form an electric vehicle lithium battery pack thermal runaway bottom spray assembly, which can fully cover the lithium battery pack for cooling control. It is not only convenient for rescue personnel to quickly and temporarily connect the bottom spray assembly to the electric vehicle chassis on site, but also suitable for fixed installation in electric vehicle centralized berths (with small engineering modification volume and small interference surface with the vehicle).

[0022] 2. The nozzle for cooling the thermal runaway of lithium battery packs in electric vehicles adopts a main pipe and branch pipe structure design, which greatly improves the coverage of the nozzle. The telescopic design of the injection main pipe assembly and the inner pipe makes the nozzle have a lower height. The threaded main pipe can be embedded in the pipe for installation, which also makes the nozzle more miniaturized and convenient for penetrating deep into the bottom of the vehicle.

[0023] 3. The nozzle used to cool the lithium battery pack of electric vehicles in case of thermal runaway has a top cover designed to expand outward when under pressure, thereby increasing the spray range of the spray branch pipe and improving the filling efficiency of the nozzle spray foam in the bottom space of the tram, thus quickly achieving the demand for controlling the fire.

[0024] 4. The nozzle for cooling the thermal runaway of the lithium battery pack of the electric vehicle utilizes a protective film design to provide protection for the injection branch pipe when it is inside the top cover. When the injection branch pipe is pushed out under pressure, the protective film is close to the injection branch pipe to form a bowl shape. The high-pressure compressed foam / water ejected from the injection hole can keep the injection branch pipe extended, and the bowl-shaped protective film can guide the compressed foam / water to expand its diffusion range. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 Schematic diagram of the internal structure of the present invention;

[0027] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 For the present invention Figure 2 Enlarged view of point B in the middle;

[0029] Figure 5A top view of the present invention;

[0030] Figure 6 For the present invention Figure 5 Middle AA cross-section.

[0031] In the figure: 1 threaded main pipe, 2 inner pipe, 3 injection mechanism, 31 outer ring, 32 top cover, 33 injection main pipe assembly, 331 injection main pipe, 332 connecting rod, 333 limiting ring, 334 rotating nozzle, 34 injection branch pipe assembly, 341 base, 342 bonding groove, 343 protective film, 344 reverse thrust groove, 345 through-hole, 346 injection branch pipe, 347 connecting ring, 348 limiting spring, 35 annular slot, 36 limiting rubber ring, 4 guide groove, 5 guide ring, 6 threaded rubber sleeve, 7 drive hole, 8 diffusion cover, 9 injection hole, 10 bearing, 11 inlet. DETAILED DESCRIPTION

[0032] For example 1, please refer to Figure 1-6 The present invention provides a technical solution: a nozzle for cooling the thermal runaway of an electric vehicle lithium battery pack, comprising a threaded main pipe 1, an inner pipe 2 is sleeved inside the threaded main pipe 1, and a spray mechanism 3 is provided at the top of the inner pipe 2.

[0033] The injection mechanism 3 includes:

[0034] The outer ring 31 is fixedly connected to the top of the inner tube 2;

[0035] A top cover 32 is provided at the top of the outer ring 31 and closes the top opening of the outer ring 31;

[0036] The injection main pipe assembly 33 is arranged on the top cover 32;

[0037] A plurality of injection branch pipe assemblies 34 are also provided on the top cover 32 .

[0038] The injection mechanism 3 further includes an annular slot 35 , into which the edge of the top cover 32 is curled inward and inserted, and a limiting rubber ring 36 is bonded between the outer ring 31 and the top cover 32 to limit the top cover 32 and provide sealing.

[0039] The injection pipe assembly 33 includes a injection pipe 331, a connecting rod 332, a limiting ring 333 and a rotating nozzle 334. The top of the injection pipe 331 is embedded in the middle of the top cover 32. The limiting ring 333 is fixedly connected to the inner wall of the inner tube 2 via the connecting rod 332. The injection pipe 331 is inserted into the limiting ring 333. The rotating nozzle 334 is inserted into the insertion cavity at the top of the injection pipe 331. The upper half of the injection pipe 331 is exposed in the position of the injection pipe 331 and is in the shape of an inverted cone. The top opening of the injection pipe 331 is located in the middle of the cone.

[0040] The injection branch pipe assembly 34 includes a base 341, an adhesive groove 342, a protective film 343, a reverse thrust groove 344, a perforation 345, an injection branch pipe 346, a connecting ring 347 and a limit spring 348. Several bases 341 are embedded in the top cover 32. An adhesive groove 342 is opened on the outside of the base 341. The protective film 343 is fan-shaped. Several protective films 343 are bonded in the adhesive groove 342 and spliced into a full circle. The adhesive groove 34 2 is provided with a reverse thrust groove 344 in the middle, and the middle of the bottom wall of the reverse thrust groove 344 is connected to the inner part of the outer ring 31 through a through-hole 345. An injection branch pipe 346 is inserted into the through-hole 345. One end of the injection branch pipe 346 points to the center position of the circle formed by the splicing of the protective films 343. The other end of the injection branch pipe 346 is located in the outer ring 31 and is fixedly connected to a connecting ring 347. The connecting ring 347 is connected to the inner wall of the top cover 32 via a limit spring 348.

[0041] For example 2, please refer to Figure 1-2 The inner wall of the threaded main pipe 1 is provided with a guide groove 4, and the outer wall of the inner pipe 2 is provided with a guide ring 5 and is slidably connected in the guide groove 4 to guide the inner pipe 2 activities.

[0042] For example three, please refer to Figure 1-2 The bottom end of the inner tube 2 is connected to the inner wall of the threaded main tube 1 through a threaded rubber sleeve 6, and when the threaded rubber sleeve 6 is in a relaxed state, the guide ring 5 is at the bottom of the guide groove 4.

[0043] In this embodiment, the threaded rubber sleeve 6 is designed to strengthen the seal between the inner tube 2 and the threaded main tube 1 and help the inner tube 2 to be retracted after stopping work.

[0044] For example 4, please refer to Figure 1-2 The outer wall of the threaded main pipe 1 on the side away from the outer ring 31 is not provided with threads and is provided with an inlet 11, and the end of the threaded main pipe 1 away from the outer ring 31 is closed.

[0045] In this embodiment, the inlet 11 is opened on the side wall of the threaded main pipe 1. When installing the nozzle, the threaded main pipe 1 is screwed into the pipe, and the nozzle is perpendicular to the flow direction in the pipe. The inlet 11 is pointed to the source of the compressed foam / water, which can directly impact the threaded main pipe 1 to reduce loss. Compared with traditional intuitive nozzles, this design can obtain a stronger impact, so that the top cover 32 is driven by the impact to move the outer ring 31 upward to expand the nozzle.

[0046] For example five, please refer to Figure 1-6 The rotating nozzle 334 is movably connected to the inner wall of the injection main pipe 331 through a bearing 10 for rotation. At least two drive holes 7 are opened on the side wall of the rotating nozzle 334 and above the injection main pipe 331. The drive holes 7 are arranged in a ring with the central axis of the rotating nozzle 334 as a reference, and the angle formed by the drive hole 7 and the tangent of the injection main pipe 331 ranges from 30° to 60°.

[0047] In this embodiment, the compressed foam / water ejected through the driving hole 7 can utilize its recoil force to drive the rotating nozzle 334 to rotate, so as to achieve full coverage within the spraying range and avoid dead angles.

[0048] The rotating nozzle 334 is fixedly connected to a diffusion cover 8 at the periphery of its top opening through a vertical pole. The diffusion cover 8 is trumpet-shaped and has a plurality of strip-shaped notches. The compressed foam / water is sprayed out through the top opening of the rotating nozzle 334 and guided to diffuse through the diffusion cover 8.

[0049] Example 6, please refer to Figure 1-6 The bottom openings of the injection branch pipe 346 and the injection main pipe 331 are both outward-expanding. The end of the injection branch pipe 346 pointing to the protective film 343 is conical, and the opening is at the tip. The side wall of the injection branch pipe 346 is also provided with a plurality of injection holes 9 arranged in a ring with the axis of the injection main pipe 331 as a reference. The outlet of the injection hole 9 points to the inside of the top cover 32.

[0050] In this embodiment, the design of the injection hole 9 allows the compressed foam / water to enter the injection branch pipe 346 and be ejected through the top outlet of the injection branch pipe 346 and the injection hole 9. The compressed foam / water ejected from the injection hole 9 quickly fills the reverse thrust groove 344 to help the injection branch pipe 346 to be ejected, and subsequently impacts the protective film 343 to expand the injection range.

[0051] Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A nozzle for cooling a lithium battery pack in an electric vehicle during thermal runaway, comprising a threaded main pipe, characterized in that: The threaded main pipe is sleeved with an inner pipe, and the top of the inner pipe is provided with a spray mechanism; The injection mechanism comprises: an outer ring, the outer ring being fixedly connected to the top end of the inner tube; A top cover is provided at the top of the outer ring and closes the top opening of the outer ring; an injection main pipe assembly, wherein the injection main pipe assembly is arranged on the top cover; A spray branch pipe assembly, wherein a plurality of the spray branch pipe assemblies are also arranged on the top cover; The ejection mechanism further includes an annular slot, the edge of the top cover is curled inward and inserted into the annular slot, and a limiting rubber ring is bonded between the outer ring and the top cover to limit the top cover and provide sealing; The injection pipe assembly includes an injection pipe, a connecting rod, a limiting ring, and a rotating nozzle. The top end of the injection pipe is embedded in the middle of the top cover. The limiting ring is fixedly connected to the inner wall of the inner pipe via the connecting rod. The injection pipe is inserted into the limiting ring. The rotating nozzle is inserted into the insertion cavity at the top of the injection pipe. The upper half of the injection pipe, where it is exposed, is in the shape of an inverted truncated cone, and the top opening of the injection pipe is located in the middle of the truncated cone. The injection branch pipe assembly includes a base, an adhesive groove, a protective film, a reverse thrust groove, a perforation, an injection branch pipe, a connecting ring and a limit spring. Several bases are embedded in the top cover. An adhesive groove is opened on the outside of the base. The protective film is fan-shaped. Several protective films are bonded in the adhesive groove and spliced into a full circle. A reverse thrust cavity is opened in the middle of the adhesive groove. The middle of the bottom wall of the reverse thrust cavity is connected to the inner part of the outer ring through a perforation. The injection branch pipe is inserted into the perforation. One end of the injection branch pipe points to the center position of the circle formed by the splicing of the protective films. The other end of the injection branch pipe is in the outer ring and fixedly connected to the connecting ring. The connecting ring is connected to the inner wall of the top cover by a limit spring. The inner wall of the threaded main pipe is provided with a guide groove, and the outer wall of the inner pipe is provided with a guide ring which is slidably connected in the guide groove and moves with the inner pipe; The bottom end of the inner tube is connected to the inner wall of the threaded main tube via a threaded rubber sleeve, and the guide ring is located at the bottom of the guide groove when the threaded rubber sleeve is in a loose state.

2. The nozzle for cooling thermal runaway of a lithium battery pack for electric vehicles according to claim 1, characterized in that: The side of the outer wall of the threaded main pipe away from the outer ring is not provided with threads and is provided with an entrance, and the end of the threaded main pipe away from the outer ring is closed.

3. The nozzle for cooling the thermal runaway of a lithium battery pack of an electric vehicle according to claim 2, characterized in that: The rotating nozzle is movably connected to the inner wall of the injection main pipe via a bearing for rotation. No less than two drive holes are provided on the side wall of the rotating nozzle and above the injection main pipe. The drive holes are arranged in a ring with the central axis of the rotating nozzle as a reference, and the angle formed between the drive holes and the tangent of the injection main pipe ranges from 30° to 60°.

4. The nozzle for cooling a lithium battery pack for electric vehicles during thermal runaway according to claim 3, characterized in that: The rotating nozzle is fixedly connected to a diffusion cover at the periphery of the top opening thereof through a vertical rod. The diffusion cover is trumpet-shaped and is provided with a plurality of strip-shaped notches.

5. The nozzle for cooling thermal runaway of a lithium battery pack for electric vehicles according to claim 4, characterized in that: The bottom openings of the injection branch pipe and the injection main pipe are both outward-flared. The end of the injection branch pipe pointing to the protective film is conical, and the opening is at the tip. The side wall of the injection branch pipe is also provided with a plurality of injection holes arranged in a ring with the axis of the injection main pipe as a reference, and the outlet of the injection hole points to the inside of the top cover.

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