Power battery fire blocking device, power battery assembly and driving equipment

Abstract

The application discloses a power battery fire blocking device, a power battery assembly and a running device, and relates to the technical field of transportation. The power battery fire blocking device comprises a blocking structure and a fire blocking structure. The blocking structure is arranged to face a battery cell assembly, and the blocking structure has a bent flow channel. The fire blocking structure is fixed relative to a shell of a power battery box. The fire blocking structure is provided with a plurality of fire blocking channels. A containing cavity, the flow channel, the fire blocking channel and an external environment of the power battery box are sequentially communicated. In the case of thermal runaway, a high-temperature gas-solid mixture formed by the corresponding power battery assembly passes through the bent flow channel. Since the solid particles of the gas-solid mixture move along a straight line at a high speed, the blocking structure can block the solid particles, thereby reducing the risk of the high-temperature solid particles spreading combustion to the outside. In addition, the fire blocking channels of the fire blocking structure are beneficial to extinguishing gas flames, thereby being respectively beneficial to reducing the risk of fire.

Description

Technical Field

[0001] This application relates to the field of transportation technology, and in particular to a power battery fire arrestor, a power battery assembly, and a driving device. Background Technology

[0002] With the development of transportation technology, flying cars and flying cars combined with land vehicles have recently emerged. Some of these vehicles use lithium batteries or other power battery components to provide power for their operation.

[0003] In related technologies, the material systems of power battery components such as lithium batteries typically include ternary materials (lithium nickel cobalt manganese oxide, or lithium nickel cobalt aluminum oxide) and lithium iron phosphate. Batteries using cathode materials with high nickel content have higher energy density, but also come with a higher risk of fire. Thermal runaway of lithium batteries, and the resulting fires, are problems faced by new energy vehicles and electric flying cars.

[0004] Some vehicles have added fire suppression systems, such as carbon dioxide fire extinguishers, perfluorohexanone fire extinguishers, or aerosol fire extinguishers, inside the power battery pack, and combine them with fire detectors and automatic control systems to achieve automatic fire suppression. The rapid release of the extinguishing agent relies on the high-pressure storage of the aforementioned fire suppression system, but high-pressure storage is heavy and its safety needs to be improved; in addition, fire detectors may fail or have delayed detection, which may make it difficult to prevent fire during thermal runaway. Utility Model Content

[0005] The main purpose of this application is to provide a fire arrestor for a power battery, a power battery assembly, and a driving device to help reduce the risk of fire.

[0006] To achieve the above objectives, the present application proposes a power battery flame arrester for a power battery assembly. The power battery assembly includes a power battery box and battery cell components. The shell of the power battery box encloses a receiving cavity, and the battery cell components are housed in the receiving cavity. The power battery flame arrester includes a blocking structure and a flame arresting structure. The blocking structure is configured to face the battery cell components and has a bent flow channel. The flame arresting structure is fixed relative to the shell of the power battery box and is disposed on a side close to the inner wall of the power battery box. The flame arresting structure has multiple flame arresting channels, and the receiving cavity, the flow channel, the flame arresting channel, and the external environment of the power battery box are sequentially connected.

[0007] Optionally, the blocking structure includes a front block and a rear block, the front block being positioned facing the battery cell assembly; the rear block being positioned on the side of the front block facing away from the battery cell assembly; the front block and the rear block being spaced apart along a direction away from the battery cell assembly, and the rear block and the front block forming the flow channel.

[0008] Optionally, the front baffle is configured as a front baffle plate, and the rear baffle is configured as a rear cover. The rear cover is fitted around the periphery of the fire-retardant structure to form a rear connection structure. The rear connection structure is fixed to the inward side of the housing of the power battery box, and the front baffle is fixed to the inner wall of the power battery box.

[0009] Optionally, the power battery fire arrestor includes at least two of the rear connection structures, which are arranged in a direction parallel to the surface of the housing.

[0010] Optionally, the front baffle is configured as a front cover, and the rear baffle is configured as a rear cover. The rear cover is fitted around the periphery of the fire-resistant structure to form a rear connection structure. The front cover is fitted around the periphery of the rear connection structure, and the front cover and the rear connection structure are fixed together to the housing of the power battery box.

[0011] Optionally, the power battery flame arrestor further includes an explosion-proof structure, wherein the receiving cavity, the flow channel, the flame arrestor channel, the interior of the explosion-proof structure, and the external environment of the power battery box are sequentially connected.

[0012] Optionally, the front baffle and the rear cover are arranged at intervals along a direction away from the battery cell assembly, and the rear cover is provided with a first through structure; when projected along the arrangement direction of the front baffle and the rear cover, the front baffle covers the first through structure; the gap between the edge of the front baffle and the rear cover communicates with the first through structure, so that the front baffle and the rear cover enclose the flow channel.

[0013] Optionally, the front baffles corresponding to each of the rear connection structures are arranged in a direction parallel to the surface of the power battery box housing, and the edges of each of the front baffles are connected to each other.

[0014] Optionally, along the arrangement direction of the front baffle and the rear cover, the distance between the surface of the rear cover facing the front baffle and the front baffle is less than or equal to 50 mm.

[0015] Optionally, the front cover and the rear cover are arranged at intervals along a direction away from the battery cell assembly, the rear cover is provided with a first through structure, and the front cover is provided with a second through structure; when projected along the arrangement direction of the front cover and the rear cover, at least a portion of the first through structure is covered by the side entity of the second through structure.

[0016] Optionally, when projected along the arrangement direction of the front cover and the rear cover, at least a portion of the second through-structure is covered by a side entity of the first through-structure; and / or, when projected along the arrangement direction of the front cover and the rear cover, the ratio of the covered area of ​​the first through-structure to the total area of ​​the first through-structure is greater than or equal to 0.5; and / or, when projected along the arrangement direction of the front cover and the rear cover, the ratio of the covered area of ​​the second through-structure to the total area of ​​the second through-structure is greater than or equal to 0.5; and / or, the maximum width of the first through-structure is greater than or equal to 3 mm and less than or equal to 10 mm; and / or, the maximum width of the second through-structure is greater than or equal to 3 mm and less than or equal to 10 mm; and / or, the first through-structure is configured as a circular through-hole; and / or, the second through-structure is configured as a circular through-hole; and / or, along The front cover and the rear cover are arranged in a direction such that the distance between the front cover and the rear cover is less than or equal to 15 mm; and / or, the rear cover is at least partially housed within the front cover; and / or, the rear cover includes a rear panel segment and a first enclosure plate, the first enclosure plate being connected to the edge of the rear panel segment and extending along the edge of the rear panel segment; the front cover includes a front panel segment and a second enclosure plate, the second enclosure plate being connected to the edge of the front panel segment and extending along the edge of the front panel segment; the second enclosure plate is disposed on the side of the front panel segment facing the rear panel segment, and at least a portion of the first enclosure plate and the rear panel segment are respectively disposed within the enclosure space of the second enclosure plate; at least one of the rear panel segment and the first enclosure plate is provided with the first through structure, and at least one of the front panel segment and the second enclosure plate is provided with the second through structure.

[0017] Optionally, the flame-arresting structure includes a flame-arresting core, wherein the front baffle, the rear baffle, and the flame-arresting core are arranged in a direction away from the battery cell assembly; the flame-arresting core is provided with a plurality of flame-arresting channels arranged side by side, the flame-arresting channels extending along the arrangement direction of the front baffle, the rear baffle, and the flame-arresting core, and the wall panels of the flame-arresting channels are made of metal material; and / or, the width of the flow channel is greater than the width of the flame-arresting channel.

[0018] Optionally, the flame-arresting core includes a core body and an outer cylinder body, the core body being provided with the flame-arresting channel; the core body is fixedly disposed within the outer cylinder body, the outer peripheral wall of the outer cylinder body being used to connect with the through hole of the power battery box; the flame-arresting core also includes a base, the base being connected to the end of the outer cylinder body away from the cell assembly; the base abuts against the core body, the base being provided with a first seat through hole, the first seat through hole communicating with the flame-arresting channel, the cross-sectional area of ​​the first seat through hole being larger than the cross-sectional area of ​​the flame-arresting channel.

[0019] Optionally, the power battery flame arrester further includes an explosion-proof structure, wherein the front baffle, the rear baffle, the flame arrester core, and the explosion-proof structure are arranged in a direction away from the battery cell assembly.

[0020] Optionally, the interior of the flame-arresting core forms an internal through-hole, and the explosion-proof structure of the power battery flame-arresting device includes a trigger rod, which is disposed within the internal through-hole. The internal through-hole and the trigger rod extend in a direction away from the battery cell assembly. The outer peripheral surface of the trigger rod is spaced apart from the wall surface of the internal through-hole. The trigger rod is driven by the airflow in the internal through-hole to open the explosion-proof structure, so that the explosion-proof structure connects the receiving cavity with the outside.

[0021] Optionally, the gap width between the outer peripheral surface of the trigger rod and the wall surface of the through hole in the core is less than the maximum width of the flame arrestor channel.

[0022] Optionally, the flame-retardant core includes the aforementioned base, and a first inner cylinder is embedded inside the core, the internal space of which forms the core inner through hole; the first inner cylinder is connected to the base, the base has a second seat through hole, and the core inner through hole communicates with the second seat through hole; the solid portion between the first seat through hole and the second seat through hole forms a second inner cylinder, and the end of the second inner cylinder is connected to the end of the first inner cylinder; the gap width between the outer peripheral surface of the trigger rod and the wall surface of the core inner through hole is greater than or equal to 0.15 mm and less than or equal to 1.5 mm; and / or, the area of ​​the first seat through hole is greater than the area of ​​the second seat through hole.

[0023] This application also provides a power battery assembly, which includes a cell assembly, a power battery box, and the aforementioned power battery flame arrestor.

[0024] Optionally, the power battery box includes a bottom wall and side walls, the bottom wall and the side walls enclosing the receiving cavity; the battery cell assembly includes multiple battery cells, the height direction of the battery cells is perpendicular to the bottom wall, and the bottom of the battery cells is provided with a pressure relief structure; the power battery flame arrester is installed on the bottom wall, and the power battery flame arrester is arranged opposite to the pressure relief structure; and / or, the blocking structure has a flow space on the side facing the battery cell assembly, the flow space has a flow spacing along the arrangement direction of the blocking structure and the flame arrester, and the flow spacing is greater than or equal to 10 mm.

[0025] This application also provides a driving device, which includes a driving mechanism and the aforementioned power battery assembly, wherein the power battery assembly is used to provide power to the driving mechanism, and the driving device includes at least one of a flying car and a land car.

[0026] The technical solution of this application sets the power battery flame arrestor as including a blocking structure and a flame arrestor structure. The blocking structure is positioned facing the battery cell assembly and has a bent flow channel. The flame arrestor structure is fixed relative to the shell of the power battery box and is located on the side close to the inner wall of the power battery box. The flame arrestor structure has multiple flame arrestor channels. The receiving cavity, flow channel, flame arrestor channel and the external environment of the power battery box are sequentially connected. In the event of thermal runaway, when the high-temperature gas-solid mixture (or flue gas) formed by the corresponding power battery assembly passes through the bent flow channel, the solid particles (usually appearing as sparks) of the gas-solid mixture are blocked by the blocking structure because they move at high speed and in a straight line. This reduces the risk of the high-temperature solid particles spreading the combustion to the outside of the power battery box. In addition, the flame arrestor channel of the flame arrestor structure helps to extinguish the gas flame, thus reducing the risk of fire. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 A schematic diagram of an embodiment of the driving device provided in this application;

[0029] Figure 2 A partial schematic diagram of an embodiment of the driving device provided in this application;

[0030] Figure 3A schematic diagram of an embodiment of the power battery assembly provided in this application;

[0031] Figure 4 An exploded view of an embodiment of the power battery flame arrestor provided in this application;

[0032] Figure 5 An exploded view of another embodiment of the power battery flame arrestor provided in this application;

[0033] Figure 6 A perspective view of another embodiment of the power battery flame arrestor provided in this application;

[0034] Figure 7 A cross-sectional view of another embodiment of the power battery flame arrestor provided in this application;

[0035] Figure 8 A schematic diagram illustrating the use of another embodiment of the power battery flame arrestor provided in this application;

[0036] Figure 9 An exploded view of yet another embodiment of the power battery flame arrestor provided in this application;

[0037] Figure 10 A perspective view of yet another embodiment of the power battery flame arrestor provided in this application;

[0038] Figure 11 A partial exploded view of yet another embodiment of the power battery flame arrestor provided in this application;

[0039] Figure 12 This is a schematic diagram illustrating the use of another embodiment of the power battery flame arrestor provided in this application.

[0040] Explanation of icon numbers:

[0041] 10. Flying car; 11. Crew cabin; 12. Flying rotor;

[0042] 20. Land-based vehicles; 30. Power battery packs; 31. Battery cell packs; 311. Battery cells;

[0043] 32. Power battery box; 321. Bottom wall; 322. Side wall; 33. Receiving cavity; 34. Flow space;

[0044] 40. Power battery flame arrestor;

[0045] 401. Flow channel; 402. Front cover; 403. Rear cover; 404. Front baffle;

[0046] 410. Front baffle; 411. Front panel section; 4111. Second through structure; 412. Second enclosure panel; 4121. Second outward flange;

[0047] 420. Rear stop; 421. Rear panel section; 4211. First through structure; 422. First enclosure panel; 4221. First outward flange;

[0048] 430. Flame-arresting core; 431. Core body; 4311. Flame-arresting channel; 4312. Internal through hole of the core;

[0049] 432. Outer cylinder; 4321. Second annular protrusion; 433. Base; 4331. First seat through hole; 4332. Second seat through hole; 4333. First connecting lug; 4334. Second inner cylinder; 434. First inner cylinder;

[0050] 440. Connecting ring; 441. First annular protrusion;

[0051] 450. Explosion-proof structure; 451. Trigger rod; 452. Second connecting lug;

[0052] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0054] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0055] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0056] With the development of transportation technology, flying cars and flying cars combined with land vehicles have recently emerged. Some of these vehicles use lithium batteries or other power battery components to provide power for their operation.

[0057] In related technologies, the material systems of power battery components such as lithium batteries typically include ternary materials (lithium nickel cobalt manganese oxide, or lithium nickel cobalt aluminum oxide) and lithium iron phosphate. Batteries using cathode materials with high nickel content have higher energy density, but also come with a higher risk of fire. Thermal runaway of lithium batteries, and the resulting fires, are problems faced by new energy vehicles and electric flying cars.

[0058] Some vehicles have added fire suppression systems, such as carbon dioxide fire extinguishers, perfluorohexanone fire extinguishers, or aerosol fire extinguishers, inside the power battery pack, and combine them with fire detectors and automatic control systems to achieve automatic fire suppression. The rapid release of the extinguishing agent relies on the high-pressure storage of the aforementioned fire suppression system, but high-pressure storage is heavy and its safety needs to be improved; in addition, fire detectors may fail or have delayed detection, which may make it difficult to prevent fire during thermal runaway.

[0059] Another type of driving device utilizes the cavity of the power battery box to form a flame extinguishing channel. The principle behind this is that the production rate and composition ratio of combustible gases during battery thermal runaway are usually relatively well-defined, thus theoretically limiting the flame length. Therefore, by introducing the flame into a sufficiently long flame extinguishing channel, the battery flame can theoretically be extinguished naturally. The disadvantage of this type of technology is that fire extinguishing depends on the flame extinguishing channel formed by the power battery box, and its effectiveness in preventing long flames ejected from high-energy-density battery cells needs improvement.

[0060] Therefore, this application proposes a fire arrestor for a power battery, a power battery assembly, and a driving device to help reduce the risk of fire.

[0061] Reference Figure 1 , Figure 2 and Figure 3 In one embodiment of this application, the driving device includes a driving mechanism and a power battery assembly 30. The power battery assembly 30 provides power to the driving mechanism. The driving device includes at least one of a flying car 10 and a land vehicle 20. For example, the driving device may include both a flying car 10 and a land vehicle 20; or, the driving device may include only a flying car 10 or only a land vehicle 20. Specifically, for the flying car 10, the driving mechanism may include a rotor 12 and a corresponding motor, etc.; for the land vehicle 20, the driving mechanism may include a wheel assembly, a corresponding drive shaft, and a corresponding motor, etc.

[0062] Reference Figure 1 and Figure 2 The vehicle includes a flying car 10 and a land vehicle 20, wherein the land vehicle 20 is used to carry the flying car 10. This can be understood as the flying car 10 being used for flight, and the land vehicle 20 being used for travel on land environments such as roads, thereby transporting the stationary flying car 10. The land vehicle 20 can be configured as a vehicle similar to a pickup truck or van, thus forming a carrying space to support the flying car 10. It is understood that the flying car 10 can be carried on the land vehicle 20, and the flying car 10 can also detach from the land vehicle 20 to perform operations such as flight.

[0063] The flying car 10 may include a passenger cabin 11 and the aforementioned flight rotor 12. The passenger cabin 11 can carry people or cargo; it can be understood that the flying car 10 can be configured as a manned aircraft. Specifically, an arm may be installed on the passenger cabin 11. One end of the arm can move relative to the passenger cabin 11, for example, by means of a rotating connection or a telescopic connection. The other end of the arm is connected to the flight rotor 13. The arm can extend or retract relative to the passenger cabin 11.

[0064] Of course, the flying car 10 described above can also be configured as a fixed-wing or tilt-wing type aircraft, and this embodiment does not limit it in this way.

[0065] Reference Figure 3The power battery assembly 30 includes a cell assembly 31, a power battery box 32, and a power battery flame arrester 40. The cell assembly 31 is housed in a receiving cavity 33. The cell assembly 31 can be understood as an assembly including cells (or battery cells); the cell assembly 31 may include multiple battery cells 311 arranged side-by-side; furthermore, the battery cells 311 can be configured as prismatic cells, cylindrical cells, or pouch cells, etc., and are connected in series or parallel via metal busbars (also called current buses) to provide power. In some embodiments, the bottom of the battery cell 311 may be provided with a pressure relief structure, which may be configured as a cell explosion-proof valve or a plate that can be ruptured by a high-temperature gas-solid mixture.

[0066] The power battery box 32 may include a bottom wall 321 and a side wall 322, which enclose a receiving cavity 33; wherein, the side wall 322 can be understood as the frame of the power battery box 32. In addition, the power battery box 32 may also include a top cover, which can cover the top opening of the side wall 322 to cover the receiving cavity 33. This embodiment does not limit this.

[0067] Furthermore, the aforementioned power battery flame arrester 40 can be installed on the bottom wall 321 or side wall 322 of the power battery box 32's housing, wherein the power battery box 32's housing includes a bottom wall 321 and a side wall 322; in some embodiments, the power battery box 32's housing may also include a top cover. Specifically, the power battery flame arrester 40 can be installed within the through-hole of the power battery box 32's housing; or, the power battery flame arrester 40 can be set as at least a part of the power battery box 32's housing, which can be understood as at least a part of the power battery flame arrester 40 being integrally formed with the power battery box 32's housing. Furthermore, the power battery box 32's housing can be provided with one, two, three, or more power battery flame arresters 40; this embodiment does not impose any limitations on this.

[0068] Understandably, referring to Figure 3 After the battery cell assembly 31 is installed into the receiving cavity 33, a flow space 34 can be formed between the battery cell assembly 31 and the power battery flame arrestor 40. It can be understood that the blocking structure (see the following description) has a flow space 34 on the side facing the battery cell assembly 31. For example, the front baffle 410 of the blocking structure (see the following description) has a flow space 34 on the side facing the battery cell assembly 31. This facilitates the provision of a buffer space for the high temperature and high pressure gas-solid mixture ejected by the battery cell assembly 31 through the flow space 34, thereby reducing the risk of excessive pressure in local areas and reducing the risk of local explosion of the casing of the power battery box 32.

[0069] Reference Figure 3 and Figure 4In some embodiments, the power battery flame arrester 40 includes a blocking structure (which may include a front baffle 410 and a rear baffle 420) and a flame arrester structure (which may include a flame arrester core 430). The blocking structure is configured to face the battery cell assembly (relative to the flame arrester structure), and the blocking structure has a bent flow channel 401. The blocking structure can be understood as a structure for blocking solid particles (including the high-temperature, high-pressure gas-solid mixture ejected from the battery cell assembly 31).

[0070] The aforementioned flame-arresting structure is fixed relative to the housing of the power battery box 32, for example, by direct or indirect connection. Furthermore, the flame-arresting structure is located near the inner wall of the power battery box 32, which can be understood as the flame-arresting structure being closer to the inner wall of the power battery box 32 (relative to the aforementioned blocking structure). The flame-arresting structure has multiple flame-arresting channels 4311, and the aforementioned receiving cavity 33, flow channel 401, flame-arresting channels 4311, and the external environment of the power battery box 32 are sequentially connected. The flame-arresting structure can be understood as a structure used to extinguish gas flames (including the high-temperature, high-pressure gas-solid mixture ejected from the battery cell assembly 31).

[0071] In some embodiments, the width of the flow channel 401 can be set to be greater than the width of the flame-arresting channel 4311. That is, relative to the flow channel 401, the flame-arresting channel 4311 can be understood as a microchannel.

[0072] In some embodiments, the aforementioned blocking structure may include a front baffle 410 and a rear baffle 420. The front baffle 410 is fixed relative to the housing of the power battery box 32. The front baffle 410 may be configured to face the cell assembly 31, for example, as described above, the side of the front baffle 410 facing the cell assembly 31 forms a flow space 34. The front baffle 410 and the housing of the power battery box 32 can be directly connected for fixation, or they can be indirectly connected through other components for fixation. The rear baffle 420 is fixed relative to the housing of the power battery box 32, and can be directly connected for fixation, or it can be indirectly connected through other components for fixation.

[0073] It is understandable that, for the gas-solid mixture discharged from the receiving cavity 33 of the power battery box 32, the front baffle 410 is in a relatively forward position, which can be understood as the front baffle 410 being in an upstream position of the gas-solid mixture; the rear baffle 420 is in a relatively rearward position, which can be understood as the rear baffle 420 being in a downstream position of the gas-solid mixture. For example, combined with Figure 3 and Figure 4The gas-solid mixture is discharged in a downward direction; correspondingly, the front baffle 410 is in a relatively high position and the rear baffle 420 is in a relatively low position.

[0074] Furthermore, the front baffle 410 and the rear baffle 420 are arranged at intervals along a direction away from the receiving cavity 33, with the rear baffle 420 disposed on the side of the front baffle 410 facing away from the receiving cavity 33; for example Figure 3 or Figure 4 In this embodiment, the front baffle 410 and the rear baffle 420 are spaced apart in the vertical direction, with the rear baffle 420 located below the front baffle 410. The front baffle 410 and the rear baffle 420 can be made of metallic materials, such as steel or copper, or other non-metallic materials capable of withstanding certain high temperatures; this embodiment does not impose any limitations on these materials.

[0075] The rear baffle 420 and the front baffle 410 enclose the flow channel 401, which can be understood as the rear baffle 420 and the front baffle 410 forming the flow channel 401; specifically, relative to the arrangement direction of the front baffle 410 and the rear baffle 420, for example, relative to... Figure 3 The flow channel 401 is bent in the vertical direction. This can be understood as the flow channel 401 forming an angle at least partially with the arrangement direction of the front baffle 410 and the rear baffle 420. The inlet of the flow channel 401 on the power battery flame arrestor 40 can be located at the edge or side of the front baffle 410 (e.g., referring to...). Figure 3 Alternatively, the inlet of the flow channel 401 on the power battery flame arrester 40 can be located on the front baffle 410 (e.g., refer to...). Figure 8 This implementation method does not impose any limitations on this.

[0076] In some implementations, refer to Figure 3 and Figure 4 The front baffle 410 may include a front baffle 404; in some embodiments, the front baffle 410 may be composed of the front baffle 404, which can be understood as the front baffle 410 only including the front baffle 404. Furthermore, the rear baffle 420 may include a rear cover 403, with the front baffle 404 and rear cover 403 respectively fixed relative to the housing of the power battery box 32; the front baffle 404 and rear cover 403 are arranged at intervals along a direction away from the cell assembly 31, for example, at intervals along the vertical direction shown in the figure. The rear cover 403 may be fitted around the periphery of the aforementioned flame-retardant structure to form a rear connection structure, which can be understood as the rear cover 403 and the aforementioned flame-retardant structure forming a single component; this rear connection structure may be fixed to the inward-facing side of the power battery box housing, and the front baffle 404 is fixed to the inner wall of the power battery box.

[0077] In some embodiments, the rear cover 403 is provided with a first through structure 4211. This first through structure 4211 can be understood as a structure that penetrates the rear cover 403. The first through structure 4211 can be configured as a through hole, notch, gap, etc. Furthermore, the first through structure 4211 can be further configured as a circular through hole, elliptical through hole, rectangular through hole, rounded rectangular through hole, etc., and this embodiment does not impose any limitations on this. In addition, the first through structure 4211 can be manufactured by integral casting, stamping, machining, etc.

[0078] Projecting along the arrangement direction of the front baffle 404 and the rear cover 403, the front baffle 404 covers the first through structure 4211; the gap between the edge of the front baffle 404 and the rear cover 403 communicates with the first through structure 4211, so that the front baffle 404 and the rear cover 403 enclose the aforementioned flow channel 401. It is understood that this flow channel 401 can also communicate with the aforementioned receiving cavity 33, so that the high-temperature and high-pressure gas-solid mixture discharged by the cell assembly 31 under thermal runaway conditions can be discharged outward through the receiving cavity 33 and the flow channel 401 to achieve pressure relief.

[0079] In some implementations, refer to Figure 4 The rear baffle 420 may include a rear plate segment 421, which may form at least a portion of the bottom flat plate of the rear cover 403. The rear plate segment 421 is used to be fixed relative to the housing of the power battery box 32; the thickness direction of the rear plate segment 421 is arranged in a direction away from the cell assembly 31, and the rear plate segment 421 is provided with the first through structure 4211. In some embodiments, the front baffle 410 may include a front plate segment 411, which may form at least a portion of the front baffle 404. The front plate segment 411 is fixed relative to the housing of the power battery box 32; the front plate segment 411 and the rear plate segment 421 are arranged at intervals in a direction away from the cell assembly 31, for example, at intervals in the vertical direction shown in the figure; the rear plate segment 421 is disposed on the side of the front baffle 410 (e.g., the front plate segment 411) facing away from the cell assembly 31, for example, the rear plate segment 421 is disposed on the lower side shown in the figure; when projected along the arrangement direction of the front plate segment 411 and the rear plate segment 421, the first through structure 4211 is completely covered by the solid of the front plate segment 411, and the edge of the front plate segment 411 and the rear plate segment 421 form a flow channel 401, so that the gap between the edge of the front baffle 404 and the rear cover 403 communicates with the first through structure 4211, so that the front baffle 404 and the rear cover 403 form the aforementioned flow channel 401.

[0080] In this embodiment, the front plate segment 411 can be a solid plate, which can be understood as the front baffle 404 being a solid plate. Furthermore, the materials of the front plate segment 411 and the front baffle 404 can be steel or carbon fiber, and their thickness can be greater than or equal to 0.5 mm and less than or equal to 2 mm. In this embodiment, the first through-structure 4211 is completely covered by the solid front plate segment 411 or the front baffle 404. The edge of the front plate segment 411 and the rear plate segment 421 form a flow channel 401. The gap between the edge of the front baffle 404 and the rear cover 403 communicates with the first through-structure 4211, which helps reduce the processing amount of the front plate segment 411 and the front baffle 404 and improves the overall manufacturing efficiency.

[0081] In some embodiments, the power battery flame arrester 40 may include at least two of the aforementioned rear connection structures (the rear cover 403 is sleeved around the periphery of the aforementioned flame arrester structure (including the flame arrester core 430) and the rear connection structures are arranged in a direction parallel to the surface of the housing of the power battery box 32.

[0082] Furthermore, the front baffles 404 corresponding to each rear connection structure can be arranged in a direction parallel to the surface of the power battery box 32, and the edges of each front baffle 404 are interconnected. In some embodiments, refer to... Figure 3 The rear cover 420 may include at least two rear cover bodies 403, for example Figure 3 Three rear covers 403 are provided; the rear covers 403 are arranged in a direction parallel to the surface of the power battery box 32 housing, for example, they can be arranged along... Figure 3 The front baffles 404 are arranged in the left-right and front-back directions. The edges of each front baffle 404 are connected to each other. This can be understood as one front baffle 404 corresponding to multiple rear cover bodies 403, and one front plate segment 411 corresponding to multiple rear plate segments 421, thereby improving the installation efficiency of the front baffles 404 and front plate segments 411. For example, the front baffles 404 and front plate segments 411 can be quickly formed by integral cutting.

[0083] The front baffle 404 and the front plate section 411 can be fixedly connected to the housing of the power battery box 32, for example, by means of a support column; the front baffle 404 and the front plate section 411 are spaced apart from the housing on the side facing the receiving cavity 33, which facilitates the flow of the gas-solid mixture formed by thermal runaway to the power battery flame arrestor 40.

[0084] Furthermore, in some embodiments, along the arrangement direction of the front baffle 404 and the rear cover 403, for example along the arrangement direction of the front plate segment 411 and the rear plate segment 421, for example along the up-down direction in the figure, the distance between the surface of the rear cover 403 facing the front baffle 404 and the front baffle 404 is less than or equal to 50 mm. This can be understood as the distance between the front plate segment 411 and the rear plate segment 421 being less than or equal to 50 mm. This distance can be further set to be less than or equal to 30 mm, thereby further improving the processing efficiency of the power battery flame arrestor 40 for gas-solid mixtures while reducing the risk of fire.

[0085] Reference Figure 5 , Figure 6 and Figure 7 In another embodiment, the front baffle 410 is configured as a front cover 402, and the rear baffle 420 is configured as a rear cover 403. The rear cover 403 is sleeved around the above-mentioned fire-resistant structure to form a rear connection structure; the front cover 402 is covered around the above-mentioned rear connection structure, and the front cover 402 and the rear connection structure are fixed together to the housing of the power battery box 32.

[0086] The aforementioned rear connection structure can be indirectly fixed to the housing of the power battery box 32 via the aforementioned front cover 402. Alternatively, the front cover 402 and the rear cover 403 can be directly fixed to the housing of the power battery box 32. The front cover 402 and the rear cover 403 are arranged at intervals along the direction away from the cell assembly 31, for example, at intervals along the vertical direction shown in the figure (this can be understood as a gap between the front cover 402 and the rear cover 403).

[0087] In this embodiment, the rear cover 403 may also be provided with the aforementioned first through structure 4211, which can be understood as the rear baffle 420 having at least one first through structure 4211. Furthermore, the front cover 402 is provided with a second through structure 4111; this second through structure 4111 can be understood as a structure that penetrates the front cover 402 (e.g., penetrates the aforementioned front plate segment 411), and can be configured as a through hole, notch, gap, etc.; furthermore, the second through structure 4111 can be configured as a circular through hole, elliptical through hole, rectangular through hole, rounded rectangular through hole, etc., and this embodiment does not impose any limitations on this. Furthermore, the second through structure 4111 can be manufactured by integral casting, stamping, machining, etc.

[0088] Projecting along the arrangement direction of the front cover 402 and the rear cover 403, for example, along the vertical direction shown in the figure, at least a portion of the first through-structure 4211 is covered by the side solid of the second through-structure 4111, thereby enabling the power cell flame arrester 40 to form the aforementioned bent flow channel 401 through the second through-structure 4111 on the front cover 402, the gap between the front cover 402 and the rear cover 403, and the first through-structure 4211 on the rear cover 403. It is understood that a portion of the first through-structure 4211 may be covered by the side solid of the second through-structure 4111, or the entire first through-structure 4211 may be covered by the side solid of the second through-structure 4111; this embodiment does not limit this.

[0089] Based on the above introduction, refer to Figure 8 The schematic diagram of one embodiment of the power battery flame arrestor 40 shows that, as projected along the arrangement direction of the front baffle 410 and the rear baffle 420, the front baffle 404 covers the first through structure 4211, or at least a portion of the first through structure 4211 is covered by the side solid of the second through structure 4111. This results in the rear baffle 420 and the front baffle 410 forming a bent flow channel 401, making the flow channel 401 formed by the front baffle 410 and the rear baffle 420 curved. Therefore, in the event of thermal runaway, the high-temperature gas-solid mixture (or flue gas) formed by the corresponding power battery assembly 30, when passing through the curved flow channel 401, is affected by the solid particles of the gas-solid mixture (typically appearing as sparks, see reference). Figure 8 The star-shaped object in the middle moves at a high speed and in a straight line, so the front baffle 410 can block this part of the solid particles, and the rear baffle 420 can block a part of the solid particles entering the flow channel 401, thereby reducing the risk that the high-temperature solid particles will spread the combustion to the outside of the power battery box 32, thus helping to reduce the risk of fire.

[0090] This can be understood as follows: In the event of thermal runaway, when the high-temperature gas-solid mixture (or flue gas) formed by the corresponding power battery assembly 30 passes through the tortuous flow channel 401, the solid particles (usually appearing as sparks) in the gas-solid mixture are blocked by the blocking structure because they move at high speed and in a straight line. This reduces the risk that the high-temperature solid particles will spread the combustion to the outside of the power battery box 32. In addition, the flame-arresting channel 4311 of the flame-arresting structure helps to extinguish the gas flame, thus reducing the risk of fire.

[0091] In the embodiment where the front baffle 410 includes a front cover 402 and the rear baffle 420 includes a rear cover 403, refer to... Figure 5 , Figure 6 or Figure 7 The rear stop 420 may also include the aforementioned rear plate segment 421; the thickness direction of the rear plate segment 421 is arranged in a direction away from the receiving cavity 33, which can be understood as the rear plate segment 421 being able to be arranged parallel to a portion of the housing at the mounting location; wherein, the rear plate segment 421 is provided with the aforementioned first through structure 4211. Furthermore, the front stop 410 may include a front plate segment 411; the front plate segment 411 and the rear plate segment 421 are arranged at intervals in a direction away from the receiving cavity 33, for example, at intervals in the vertical direction shown in the figure; the rear plate segment 421 is disposed on the side of the front stop 410 opposite to the receiving cavity 33, for example, the rear plate segment 421 is disposed on the lower side shown in the figure. The front plate segment 411 is provided with the aforementioned second through structure 4111.

[0092] In some implementations, refer to Figure 5 , Figure 6 or Figure 7 The projection is made along the arrangement direction of the front cover 402 and the rear cover 403, for example, along the arrangement direction of the front plate segment 411 and the rear plate segment 421, or for example, along the vertical direction shown in the figure. At least a portion of the second through structure 4111 is covered by the side solid of the first through structure 4211, thereby forming a more curved flow channel 401, which further reduces the risk of high-temperature solid particles spreading combustion to the outside of the power battery box 32, thereby further helping to reduce the fire risk. It is possible that a portion of the second through structure 4111 is covered by the side solid of the first through structure 4211, or that the entire second through structure 4111 is covered by the side solid of the first through structure 4211; this embodiment does not limit this.

[0093] In some embodiments, projection is made along the arrangement direction of the front cover 402 and the rear cover 403, for example, along the arrangement direction of the front plate segment 411 and the rear plate segment 421, or along the vertical direction shown in the figure. The ratio of the covered area of ​​the first through structure 4211 to the total area of ​​the first through structure 4211 is greater than or equal to 0.5. For example, the ratio of the covered area of ​​the first through structure 4211 to the total area of ​​the first through structure 4211 can be further set to greater than or equal to 0.7, 0.8, or 0.9, thereby forming a more curved flow channel 401, which further reduces the risk that high-temperature solid particles will spread combustion to the outside of the power battery box 32, thereby further helping to reduce the risk of fire.

[0094] In some embodiments, projection is made along the arrangement direction of the front cover 402 and the rear cover 403, for example, along the arrangement direction of the front plate segment 411 and the rear plate segment 421, or for example, along the vertical direction shown in the figure. The ratio of the covered area of ​​the second through structure 4111 to the total area of ​​the second through structure 4111 is greater than or equal to 0.5. For example, the ratio of the covered area of ​​the second through structure 4111 to the total area of ​​the second through structure 4111 can be further set to greater than or equal to 0.7, 0.8, or 0.9, thereby forming a more curved flow channel 401, thereby further reducing the risk that high-temperature solid particles will spread combustion to the outside of the power battery box 32, thereby further helping to reduce the fire risk.

[0095] In some embodiments, the maximum width of the first through-hole 4211 is greater than or equal to 3 mm and less than or equal to 10 mm. For example, the first through-hole 4211 can be configured as a circular through-hole, which is more conducive to blocking irregularly shaped particles. In this case, the aperture of the first through-hole 4211 can be greater than or equal to 3 mm and less than or equal to 10 mm, thereby facilitating better blocking of solid particles. It is understood that the first through-hole 4211 can also be configured as a through-hole of other shapes as described above. In some embodiments, the maximum width of the first through-hole 4211 can be further greater than or equal to 4 mm and less than or equal to 8 mm.

[0096] In some embodiments, the maximum width of the second through-hole 4111 is greater than or equal to 3 mm and less than or equal to 10 mm; for example, the second through-hole 4111 is configured as a circular through-hole, which is more conducive to blocking irregularly shaped particles. In this case, the aperture of the second through-hole 4111 can be greater than or equal to 3 mm and less than or equal to 10 mm, thereby facilitating better blocking of solid particles. It is understood that the second through-hole 4111 can also be configured as a through-hole of other shapes as described above. In some embodiments, the maximum width of the second through-hole 4111 can be further greater than or equal to 4 mm and less than or equal to 8 mm.

[0097] In some implementations, refer to Figure 7 Along the arrangement direction of the front cover 402 and the rear cover 403, for example, along the arrangement direction of the front plate segment 411 and the rear plate segment 421, for example, along Figure 7In the vertical direction, the distance between the front cover 402 and the rear cover 403 is less than or equal to 15 mm. For example, the distance G1 between the front plate segment 411 and the rear plate segment 421 is less than or equal to 15 mm. This facilitates preventing larger solid particles from entering the front cover 402 and the rear cover 403 and thus discharging them outwards, for example, preventing them from entering between the front plate segment 411 and the rear plate segment 421 and discharging them outwards. In some embodiments, the distance between the front cover 402 and the rear cover 403 (e.g., the distance G1 between the front plate segment 411 and the rear plate segment 421) can be further set to less than or equal to 10 mm.

[0098] In some embodiments, the rear cover 403 is at least partially housed within the front cover 402, thereby improving the compactness of the power battery flame arrestor 40. Furthermore, the openings of the front cover 402 and the rear cover 403 can be respectively configured to face away from the aforementioned cell assembly 31; for example, the openings of the front cover 402 and the rear cover 403 can respectively face towards... Figure 5 , Figure 7 The lower side of the middle.

[0099] In some implementations, refer to Figure 5 or Figure 7 The rear cover 403 also includes a first enclosure plate 422, which is connected to the edge of the rear plate segment 421 and extends along the edge of the rear plate segment 421. The first enclosure plate 422 and the rear plate segment 421 can be integrally formed for connection, or they can be connected by welding, bonding, or other methods. The power battery box 32 may have a through-hole, and the outer peripheral wall of the first enclosure plate 422 can be used to connect to the through-hole, including direct or indirect connection, thereby facilitating installation through the first enclosure plate 422.

[0100] In some implementations, refer to Figure 5 or Figure 7 The front cover 402 also includes a second enclosure 412, which is connected to the edge of the front panel segment 411 and extends along the edge of the front panel segment 411. The second enclosure 412 and the front panel segment 411 can be integrally formed, or they can be connected by welding, bonding, or other methods. The second enclosure 412 is located on the side of the front panel segment 411 facing the rear panel segment 421, for example, on... Figure 5The lower side of the front panel section 411 and the outer peripheral wall of the second enclosure 412 can be used to connect with the through-hole of the power battery box 32, including direct or indirect connection, thereby facilitating installation through the second enclosure 412. Furthermore, at least a portion of the first enclosure 422 and the rear panel section 421 are respectively disposed within the enclosed space of the second enclosure 412, which can be understood as allowing the rear cover 403 to be at least partially accommodated within the front cover 402, thereby improving structural compactness. (Refer to...) Figure 7 The outer periphery of the second enclosure 412 can abut against the inner side of the first enclosure 422, thereby facilitating the blocking of larger solid particles and improving the connection stability between the second enclosure 412 and the first enclosure 422. Of course, a gap can also be provided between the outer periphery of the second enclosure 412 and the inner side of the first enclosure 422. The width of this gap can be set to be smaller than the maximum width of the first through structure 4211 or smaller than the maximum width of the second through structure 4111, so as to facilitate the blocking of larger solid particles. This embodiment does not limit this.

[0101] In some implementations, refer to Figure 5 , Figure 6 or Figure 7 The first enclosure plate 422 may also be provided with the aforementioned first through structure 4211, and the second enclosure plate 412 may also be provided with the aforementioned second through structure 4111. Projecting along the thickness direction of the first enclosure plate 422, for example, along the left-right direction in the figure, a portion of the first through structure 4211 on the first enclosure plate 422 is partially covered by the side solid of the second through structure 4111 on the second enclosure plate 412. This allows a curved flow channel 401 to be formed on the side of the front plate section 411, further allowing the flow to pass through the first through structure 4211 on the first enclosure plate 422. The second through-structure 4111 on the second enclosure 412 improves the ability to handle thermally runaway gas-solid mixtures; in some embodiments, when projected along the thickness direction of the first enclosure 422, for example, along the left-right direction in the figure, a portion of the second through-structure 4111 on the second enclosure 412 is covered by the side solid of the first through-structure 4211 on the first enclosure 422, thereby enabling the formation of a more curved flow channel 401 on the side of the front plate section 411, thereby further improving the ability to handle thermally runaway gas-solid mixtures.

[0102] This can be understood as meaning that at least one of the rear panel segment 421 and the first enclosure panel 422 may be provided with a first through structure 4211, and at least one of the front panel segment 411 and the second enclosure panel 412 may be provided with a second through structure 4111.

[0103] It is understood that the front cover 410 may include both the front cover 404 and the front cover 402. In this case, the front cover 404 and the corresponding rear cover 403 are engaged, and the front cover 402 and the corresponding rear cover 403 are engaged.

[0104] In some implementations, refer to Figure 5 , Figure 6 or Figure 7 The aforementioned flame-arresting structure may include a flame-arresting core 430. The front baffle 410, rear baffle 420, and flame-arresting core 430 are arranged in a direction away from the battery cell assembly 31. For example, the front plate segment 411, rear plate segment 421, and flame-arresting core 430 are arranged in a direction away from the battery cell assembly 31, such as in the vertical direction shown in the figure. At least one of the outer periphery of the second enclosure plate 412 and the outer periphery of the flame-arresting core 430 can be used to connect to the through-hole of the power battery box 32, thereby facilitating installation onto the power battery box 32. Furthermore, referring to… Figure 7 or Figure 8 The flame arrestor core 430 is provided with multiple flame arrestor channels 4311 arranged side by side. The flame arrestor channels 4311 extend along the arrangement direction of the front baffle 410, the rear baffle 420 and the flame arrestor core 430. For example, the flame arrestor channels 4311 extend along the vertical direction in the figure, and each flame arrestor channel 4311 is arranged side by side along the horizontal direction and the front-back direction in the figure.

[0105] The wall panel of the aforementioned fire-arresting channel 4311 can be made of metal. Furthermore, compared to the first through-structure 4211 and the second through-structure 4111, the cross-sectional area of ​​the fire-arresting channel 4311 is smaller; this can be understood as the cross-sectional area of ​​the fire-arresting channel 4311 being smaller than that of the first through-structure 4211 or the second through-structure 4111. That is, the fire-arresting channel 4311 can be understood as a microchannel. Additionally, the fire-arresting core 430 can be configured as a straight-lined fire-arresting core or a diagonal-lined fire-arresting core. In the straight-lined fire-arresting core, the extension direction of the fire-arresting channel 4311 is parallel to the arrangement direction of the front baffle 410, the rear baffle 420, and the fire-arresting core 430. In the diagonal-lined fire-arresting core, the extension direction of the fire-arresting channel 4311 is inclined to the arrangement direction of the front baffle 410, the rear baffle 420, and the fire-arresting core 430.

[0106] In this embodiment, for the gas-solid mixture formed by the power battery assembly 30 under thermal runaway, the aforementioned front baffle 410 and rear baffle 420 can block a large portion of the solid particles, so that the high-pressure gas-solid mixture in the combustion state becomes a relatively pure gas flame after passing through the front baffle 410 and rear baffle 420. When these gas flames pass through the aforementioned flame arrestor core 430, the flame arrestor core 430 can improve the quenching success rate through multiple parallel flame arrestor channels 4311. Among them, the flame arrestor channels 4311 of the flame arrestor core 430 can improve the quenching success rate through either the wall effect or the cold wall effect. Understandably, the wall effect is a chemical action, where the wall of the flame arrestor channel 4311 is made of metal (for example, the flame arrestor core 430 can be made mostly or entirely of metal), thereby capturing and absorbing the free radicals necessary for the combustion chain reaction, thus terminating the chain reaction and increasing the success rate of quenching. The cold wall effect is a physical action, which involves bringing the gas flame into contact with a relatively small metal channel like the flame arrestor channel 4311, thereby transferring the heat of the flame combustion to the flame arrestor core 430, which helps to reduce the temperature of the gas flame below the ignition point temperature, thus increasing the success rate of quenching.

[0107] In some implementations, refer to Figure 5 , Figure 6 or Figure 7 The power battery flame arrester 40 also includes a connecting ring 440, and at least a portion of the first enclosure plate 422 and at least a portion of the second enclosure plate 412 are fitted inside the connecting ring 440, for example... Figure 7 The lower ends of the first enclosure plate 422 and the second enclosure plate 412 are respectively fitted inside the connecting ring 440; at least a portion of the flame arrestor core 430 is fitted inside the connecting ring 440, for example... Figure 7 The upper end of the flame-retardant core 430 is fitted inside the connecting ring 440. In addition, the second enclosure plate 412 is fixedly connected to one end of the connecting ring 440, and the flame-retardant core 430 is fixedly connected to the other end of the connecting ring 440, thereby facilitating improved installation efficiency through the connecting ring 440; wherein the above-mentioned fixed connection can be achieved by means of abutment, snap-fit, etc.

[0108] In some implementations, refer to Figure 5 or Figure 7 The first enclosure 422 has a first outward flange 4221 at the end away from the rear panel 421, for example... Figure 5 The lower end of the first enclosure plate 422 is provided with the first outward flange 4221, wherein the first outward flange 4221 may be annular. In some embodiments, the second enclosure plate 412 is provided with the second outward flange 4121 at the end away from the front plate segment 411, for example... Figure 5The lower end of the second enclosure plate 412 is provided with the second outward flange 4121, which may be annular. In addition, the connecting ring 440 is provided with a first annular protrusion 441 on the inner side of one end facing the receiving cavity 33, for example, the inner side of the upper end of the connecting ring 440 in the figure is provided with the first annular protrusion 441; the first annular protrusion 441 is used to abut against the side of the second outward flange 4121 facing the front plate section 411, and / or the first annular protrusion 441 is used to abut against the side of the first outward flange 4221 facing the rear plate section 421, for example, abut against the upper side of the first outward flange 4221 and the second outward flange 4121 in the figure, thereby improving the installation efficiency of the front stop 410 and the rear stop 420 respectively through the abutment of the first annular protrusion 441.

[0109] In some embodiments, the outer periphery of the flame arrestor core 430 is provided with an external spiral structure, which can be configured as an external thread or a spiral groove, etc.; the connecting ring 440 is used for the end away from the receiving cavity 33 (e.g. Figure 7 The inner side of the lower end of the flame arrester core 430 is provided with an inner spiral structure, which can be configured as an internal thread or a spiral groove, etc. The inner spiral structure is spirally connected to the outer spiral structure of the flame arrester core 430, thereby improving the installation efficiency of the flame arrester core 430 and the connecting ring 440.

[0110] Furthermore, referring to Figure 5 or Figure 7 The flame arrester core 430 has a second annular protrusion 4321 on its outer periphery, and the outer periphery of the second annular protrusion 4321 has the aforementioned outer spiral structure; along the arrangement direction of the front baffle 410, the rear baffle 420 and the flame arrester core 430, for example along Figure 7 In the vertical direction, the second annular protrusion 4321 is positioned opposite to the first annular protrusion 441, thereby providing more space for setting more fire-arresting channels 4311 through the first annular protrusion 441 of the connecting ring 440 and the second annular protrusion 4321 of the fire-arresting core 430 (e.g., Figure 5 The core 431 of the middle flame arrester core 430 has more space in the left-right and front-back directions to set more flame arresting channels 4311, thereby further improving the power battery flame arrester device 40's ability to handle thermal runaway gas-solid mixtures.

[0111] In some implementations, refer to Figure 5 , Figure 6 and Figure 7 The flame-arresting core 430 includes the aforementioned core 431 and outer cylinder 432. The core 431 is provided with the aforementioned flame-arresting channel 4311. The core 431 is fixedly disposed inside the outer cylinder 432. The outer peripheral wall of the outer cylinder 432 is used to connect with the through hole of the power battery box 32, thereby facilitating the parallel manufacturing of the core 431 and the outer cylinder 432 and improving the overall manufacturing efficiency.

[0112] In some implementations, refer to Figure 5 , Figure 6 and Figure 7 The flame-arresting core 430 also includes a base 433, which is connected to the end of the outer cylinder 432 away from the cell assembly 31, for example, to the lower end of the outer cylinder 432 shown in the figure, and can be connected by means of integral molding, bonding, welding, etc. The base 433 abuts against the core 431 to prevent the core 431 from being ejected outwards by airflow caused by thermal runaway. Furthermore, the base 433 has a first through hole 4331, which communicates with the flame-arresting channel 4311, thus forming a through hole communicating with the outside. The cross-sectional area of ​​the first through hole 4331 is larger than that of the flame-arresting channel 4311, making it easier to process the larger cross-sectional area of ​​the first through hole 4331 when the base 433 supports the core 431.

[0113] In some implementations, refer to Figure 5 , Figure 6 and Figure 7 The base 433 may be provided with a first connecting ear 4333, which is used to fix and connect to the housing of the power battery box 32, thereby improving installation efficiency. For example, the base 433 may directly or indirectly abut against the inner wall of the power battery box 32 and be connected through the first connecting ear 4333. The first connecting ear 4333 may be provided with a connecting through hole, facilitating connection using fasteners such as rivets, bolts, and screws. (Refer to...) Figure 5 Two first connecting ears 4333 can be symmetrically arranged on both sides of the base 433 to facilitate the connection stability with the housing of the power battery box 32.

[0114] In some implementations, refer to Figure 9 , Figure 10 or Figure 11 The power battery flame arrestor 40 also includes an explosion-proof structure 450, which can be understood as an explosion-proof valve for flame arrest. This explosion-proof structure 450 can be configured as a piston-type explosion-proof valve, a pin-type explosion-proof valve, etc. The aforementioned receiving cavity 33, flow channel 401, flame-arresting channel 4311, and the interior of the explosion-proof structure 450 are sequentially connected to the external environment of the power battery box 32. Thus, the power battery flame arrestor 40 can, through the explosion-proof structure 450, reduce the risk of fire while promptly releasing internal high pressure.

[0115] Among them, the front baffle 410, the rear baffle 420, the flame arrestor core 430 and the explosion-proof structure 450 can be arranged in a direction away from the battery cell assembly 31, such as in the vertical direction shown in the figure. Thus, the power battery flame arrestor 40 can release the internal high voltage in a timely manner through the explosion-proof structure 450 while reducing the risk of fire formation.

[0116] It is understood that the aforementioned power battery fire arrestor 40, which includes a front baffle 404 and a rear cover 403, and the power battery fire arrestor 40, which includes a front cover 402 and a rear cover 403, can all be further equipped with the explosion-proof structure 450.

[0117] In some implementations, refer to Figure 9 or Figure 11 The flame-arresting core 430 has an internal through-hole 4312. The explosion-proof structure 450 includes a trigger rod 451, which is disposed within the internal through-hole 4312. The internal through-hole 4312 and the trigger rod 451 extend in a direction away from the battery cell assembly 31, for example, in the vertical direction shown in the figure. The outer peripheral surface of the trigger rod 451 is spaced apart from the wall surface of the internal through-hole 4312, allowing airflow to pass through. The trigger rod 451 is driven by the airflow through the internal through-hole 4312 to open the explosion-proof structure 450, thereby connecting the receiving cavity 33 with the outside. For example, the explosion-proof structure 450 can be configured as a piston-type explosion-proof valve, with the piston rod of the piston-type explosion-proof valve configured as the aforementioned trigger rod 451.

[0118] In this embodiment, the outer peripheral surface of the trigger rod 451 is spaced apart from the wall surface of the through hole 4312 in the core, which is conducive to releasing the internal high voltage more promptly and to improving the structural compactness of the power battery flame arrestor 40.

[0119] In some embodiments, the gap between the outer peripheral surface of the trigger rod 451 and the wall of the through hole 4312 is smaller than the maximum width of the flame arresting channel 4311, which helps to prevent flames from escaping from the gap between the outer peripheral surface of the trigger rod 451 and the wall of the through hole 4312, thereby improving the flame arresting success rate.

[0120] In some implementations, refer to Figure 9The core 431 has a first inner cylinder 434 embedded inside, and the internal space of the first inner cylinder 434 forms the aforementioned core through hole 4312. The first inner cylinder 434 is connected to a base 433, and the base 433 has a second seat through hole 4332, which communicates with the core through hole 4312. In this embodiment, the first inner cylinder 434 ensures a stable gap between the outer peripheral surface of the trigger rod 451 and the wall surface of the core through hole 4312, further preventing flame from escaping through the gap between the outer peripheral surface of the trigger rod 451 and the wall surface of the core through hole 4312, thereby further improving the flame arrest success rate.

[0121] In some implementations, refer to Figure 9 The solid portion between the first seat through hole 4331 and the second seat through hole 4332 forms the second inner cylinder 4334. The end of the second inner cylinder 4334 is connected to the end of the first inner cylinder 434, thereby improving the installation stability of the first inner cylinder 434.

[0122] In some implementations, refer to Figure 9 or Figure 10 The explosion-proof structure 450 may have a second connecting ear 452 on its outer side. The second connecting ear 452 is used for fixed connection with the housing of the power battery box 32, thereby improving installation efficiency. For example, the explosion-proof structure 450 can directly or indirectly abut against the inner wall of the power battery box 32 and be connected through the second connecting ear 452. The second connecting ear 452 may have a mounting through hole to facilitate connection using fasteners such as rivets, bolts, and screws. (Refer to...) Figure 9 Two second connecting ears 452 can be symmetrically arranged on both sides of the explosion-proof structure 450, thereby facilitating improved connection stability with the housing of the power battery box 32. (Refer to...) Figure 10 Each of the second connecting ears 452 can be overlapped with the first connecting ear 4333, thereby reducing the overall space occupied by the second connecting ears 452 and the first connecting ear 4333, and thus reducing the risk of foreign objects accumulating in the second connecting ears 452 and the first connecting ear 4333.

[0123] In some embodiments, the gap width between the outer peripheral surface of the trigger rod 451 and the wall surface of the through hole 4312 is greater than or equal to 0.15 mm and less than or equal to 1.5 mm, which helps to prevent flames from escaping from the gap between the outer peripheral surface of the trigger rod 451 and the wall surface of the through hole 4312, thereby improving the flame arrest success rate.

[0124] In some embodiments, the area of ​​the first seat through hole 4331 is larger than the area of ​​the second seat through hole 4332, so that the second seat through hole 4332 can easily form a smaller gap with the trigger rod 451, thereby helping to prevent the flame from escaping from the gap between the outer peripheral surface of the trigger rod 451 and the wall surface of the core through hole 4312, thereby improving the flame arrest success rate.

[0125] Reference Figure 12 When the power battery flame arrester with the explosion-proof structure 450 is in use, if the pressure inside the cavity 33 of the power battery box 32 is large, the airflow can act on the explosion-proof structure 450 from the gap between the outer peripheral surface of the trigger rod 451 and the wall of the core through hole 4312, as shown by the dotted arrow in the figure, thereby making the explosion-proof structure 450 conductive.

[0126] In some implementations, refer to Figure 2 The height direction of the battery cell 311 is perpendicular to the bottom wall 321. For example, the height direction of the battery cell 311 is set along the vertical direction in the figure. The power battery flame arrester 40 is installed on the bottom wall 321. The power battery flame arrester 40 is set opposite to the pressure relief structure of the battery cell 311, so that the power battery flame arrester 40 can handle the gas-solid mixture discharged by the battery cell 311 in a timely manner.

[0127] In one embodiment of the power battery flame arrestor 40, which includes a front baffle 404 and a rear cover 403, the pressure relief structure, the front baffle 404, and the rear cover 403 can be arranged sequentially, for example, along... Figure 2 The components are arranged sequentially in the top and bottom directions. When the battery cell 311 discharges the high-temperature gas-solid mixture through the pressure relief structure, the front baffle 404 will change the flow direction of the high-temperature gas-solid mixture, thereby making it easier to block more solid particles (usually appearing as sparks), which helps to further reduce the risk of fire.

[0128] In some embodiments, the flow space 34 described above has a flow spacing along the arrangement direction of the front baffle 410 and the rear baffle 420, for example, the flow spacing along... Figure 2 The flow direction is vertical; the flow spacing is greater than or equal to 10 mm. This can be understood as the absence of obstructions within at least 10 mm inside the power battery flame arrestor 40, thereby facilitating the flow of thermally runaway gas-solid mixture to the power battery flame arrestor 40.

[0129] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A power cell flame arrestor, comprising: The power battery flame arrester is used in a power battery assembly, which includes a power battery box and battery cell assemblies. The casing of the power battery box encloses a receiving cavity, and the battery cell assemblies are housed in the receiving cavity. The power battery flame arrester includes: A blocking structure, the blocking structure being configured to face the cell assembly, the blocking structure having a bent flow channel; A flame-arresting structure is fixed relative to the housing of the power battery box and is disposed on the side near the inner wall of the power battery box. The flame-arresting structure is provided with multiple flame-arresting channels, and the receiving cavity, the flow channel, the flame-arresting channels and the external environment of the power battery box are sequentially connected.

2. A power cell flame arrestor as defined in claim 1, wherein, The blocking structure includes a front block and a rear block, the front block being positioned facing the battery cell assembly; the rear block being positioned on the side of the front block facing away from the battery cell assembly; the front block and the rear block are arranged at intervals along a direction away from the battery cell assembly, and the rear block and the front block form the flow channel.

3. A power cell flame arrestor as defined in claim 2, wherein, The front baffle is configured as a front baffle plate, and the rear baffle is configured as a rear cover. The rear cover is fitted around the periphery of the fire-resistant structure to form a rear connection structure. The rear connection structure is fixed to the inward side of the housing of the power battery box, and the front baffle is fixed to the inner wall of the power battery box.

4. A power cell flame arrestor as defined in claim 3, wherein, The power battery flame arrestor includes at least two of the rear connection structures, which are arranged in a direction parallel to the surface of the housing.

5. The power cell flame arrestor of claim 2, wherein, The front baffle is configured as a front cover, and the rear baffle is configured as a rear cover. The rear cover is fitted around the periphery of the fire-resistant structure to form a rear connection structure. The front cover is fitted around the periphery of the rear connection structure, and the front cover and the rear connection structure are fixed together to the housing of the power battery box.

6. A power cell flame arrestor as claimed in any one of claims 1 to 5, wherein, The power battery flame arrestor also includes an explosion-proof structure, and the receiving cavity, the flow channel, the flame arrestor channel, the interior of the explosion-proof structure, and the external environment of the power battery box are sequentially connected.

7. A power cell flame arrestor as claimed in claim 3 or 4, wherein the flame arrestor is formed from a material having a melting point of at least 800°C. The front baffle and the rear cover are arranged at intervals in a direction away from the battery cell assembly, and the rear cover is provided with a first through structure; when projected along the arrangement direction of the front baffle and the rear cover, the front baffle covers the first through structure; the gap between the edge of the front baffle and the rear cover communicates with the first through structure, so that the front baffle and the rear cover enclose the flow channel.

8. The power cell flame arrestor of claim 4, wherein, The front baffles corresponding to each of the rear connection structures are arranged in a direction parallel to the surface of the housing, and the edges of each of the front baffles are connected to each other.

9. A power cell flame arrestor as claimed in claim 3 or 4, wherein, Along the arrangement direction of the front baffle and the rear cover, the distance between the surface of the rear cover facing the front baffle and the front baffle is less than or equal to 50 mm.

10. The power cell flame arrestor of claim 5, wherein, The front cover and the rear cover are arranged at intervals along a direction away from the battery cell assembly. The rear cover has a first through structure and the front cover has a second through structure. When projected along the arrangement direction of the front cover and the rear cover, at least a portion of the first through structure is covered by the side entity of the second through structure.

11. A power cell flame arrestor as defined in claim 10, wherein, Projecting along the arrangement direction of the front cover and the rear cover, at least a portion of the second through structure is covered by the side entity of the first through structure; And / or, Projecting along the arrangement direction of the front cover and the rear cover, the ratio of the area covered by the first through-structure to the total area of ​​the first through-structure is greater than or equal to 0.5; and / or, Projecting along the arrangement direction of the front cover and the rear cover, the ratio of the area covered by the second through-structure to the total area of ​​the second through-structure is greater than or equal to 0.5; and / or, The maximum width of the first through-structure is greater than or equal to 3 mm and less than or equal to 10 mm; and / or, The maximum width of the second through structure is greater than or equal to 3 mm and less than or equal to 10 mm; and / or, The first through-hole structure is configured as a circular through-hole; and / or, The second through structure is configured as a circular through hole; and / or, Along the arrangement direction of the front cover and the rear cover, the distance between the front cover and the rear cover is less than or equal to 15 mm; and / or, The rear cover is at least partially housed within the front cover; and / or The rear cover includes a rear panel segment and a first enclosure panel, the first enclosure panel being connected to the edge of the rear panel segment and extending along the edge of the rear panel segment; the front cover includes a front panel segment and a second enclosure panel, the second enclosure panel being connected to the edge of the front panel segment and extending along the edge of the front panel segment; the second enclosure panel is disposed on the side of the front panel segment facing the rear panel segment, and at least a portion of the first enclosure panel and the rear panel segment are respectively disposed within the enclosure space of the second enclosure panel; at least one of the rear panel segment and the first enclosure panel is provided with a first through structure, and at least one of the front panel segment and the second enclosure panel is provided with a second through structure.

12. A power cell flame arrestor as claimed in any one of claims 2 to 5, wherein, The flame-arresting structure includes a flame-arresting core, wherein the front baffle, the rear baffle, and the flame-arresting core are arranged in a direction away from the battery cell assembly; the flame-arresting core has multiple flame-arresting channels arranged side by side, the flame-arresting channels extending along the arrangement direction of the front baffle, the rear baffle, and the flame-arresting core, and the wall panels of the flame-arresting channels are made of metal material; and / or, The width of the flow channel is greater than the width of the fire-resistant channel.

13. A power cell flame arrestor as defined in claim 12, wherein, The flame-arresting core includes a core body and an outer cylinder body. The core body is provided with the flame-arresting channel. The core body is fixedly installed inside the outer cylinder body, and the outer peripheral wall of the outer cylinder body is used to connect with the through hole of the power battery box body. The flame-arresting core also includes a base, which is connected to the end of the outer cylinder away from the cell assembly; the base abuts against the core, and the base is provided with a first seat through hole, which communicates with the flame-arresting channel, and the cross-sectional area of ​​the first seat through hole is larger than the cross-sectional area of ​​the flame-arresting channel.

14. A power cell flame arrestor as defined in claim 13, wherein, The power battery flame arrestor also includes an explosion-proof structure, wherein the front baffle, the rear baffle, the flame arrestor core and the explosion-proof structure are arranged in a direction away from the battery cell assembly.

15. A power cell flame arrestor as defined in claim 14, wherein, The flame-arresting core has an internal through-hole, and the explosion-proof structure of the power battery flame-arresting device includes a trigger rod, which is disposed in the internal through-hole. The internal through-hole and the trigger rod extend in a direction away from the cell assembly. The outer peripheral surface of the trigger rod is spaced apart from the wall surface of the through hole in the core. The trigger rod is driven by the airflow in the through hole in the core to make the explosion-proof structure open, so that the explosion-proof structure connects the receiving cavity with the outside.

16. A power cell flame arrestor as defined in claim 15, wherein, The gap between the outer peripheral surface of the trigger rod and the wall of the through hole in the core is less than the maximum width of the flame arrestor channel.

17. The power cell flame arrestor of claim 15, wherein, The flame-retardant core includes the base as described in claim 13, wherein a first inner cylinder is embedded inside the core, and the internal space of the first inner cylinder forms the core through hole; the first inner cylinder is connected to the base, and the base is provided with a second seat through hole, and the core through hole communicates with the second seat through hole. The solid portion between the first seat through hole and the second seat through hole forms a second inner cylinder, and the end of the second inner cylinder is connected to the end of the first inner cylinder; The gap width between the outer peripheral surface of the trigger rod and the wall surface of the through hole in the core is greater than or equal to 0.15 mm and less than or equal to 1.5 mm; and / or, the area of ​​the first through hole in the base body is greater than the area of ​​the second through hole in the base body.

18. A power battery assembly, characterized in that, The power battery assembly includes a cell assembly, a power battery box, and a power battery flame arrestor as described in any one of claims 1 to 17.

19. The power battery assembly of claim 18, wherein, The power battery box includes a bottom wall and side walls, which enclose the receiving cavity; the battery cell assembly includes multiple battery cells, the height of which is perpendicular to the bottom wall, and the bottom of each battery cell is provided with a pressure relief structure; the power battery flame arrester is installed on the bottom wall, and is disposed opposite to the pressure relief structure; and / or, The blocking structure has a flow space on the side facing the battery cell assembly. The flow space has a flow spacing along the arrangement direction of the blocking structure and the flame arrester structure, and the flow spacing is greater than or equal to 10 mm.

20. A traveling apparatus characterized by comprising: The driving device includes a driving mechanism and a power battery assembly as described in claim 18 or 19, the power battery assembly being used to provide power to the driving mechanism, and the driving device includes at least one of a flying car and a land car.

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