Battery pack

Abstract

The invention provides a battery pack. The battery pack comprises a box body, and a battery pack, a first exhaust pipe, a first flange plate and a second flange plate which are arranged in the box body, the first exhaust pipe comprises a first pipe end and a second pipe end, the first pipe end is connected with the first flange plate, and the second pipe end is detachably connected with the box body; an air tap is arranged on the battery pack; the second flange plate is connected to the air tap; the second flange plate is connected with the first flange plate to communicate the air nozzle with the first exhaust pipe. Compared with the prior art, the battery pack abandons a quick-plug connection mode, the connection reliability between the first exhaust pipe and the battery pack is effectively improved, meanwhile, the first flange plate and the second flange plate are connected in a detachable mode, the first exhaust pipe and the box body are connected in a detachable mode, and the connection reliability is improved. The first exhaust pipe can be conveniently disassembled, maintained and cleaned in the later period, and the maintenance difficulty and cost are reduced.

Description

Technical Field

[0001] This application relates to the field of photovoltaic module manufacturing technology, and in particular to a battery pack. Background Technology

[0002] In air-cooled battery pack systems, the exhaust pipe serves as a critical channel for discharging high-temperature, flammable gases during battery thermal runaway, and its design directly impacts the safety of the battery pack and the entire vehicle. Current technologies widely employ quick-connect fittings to connect the exhaust pipes inside and outside the battery pack to the vehicle system. However, this connection structure suffers from poor reliability, easily loosening under vibration, impact, and thermal expansion stress, failing to meet the high sealing requirements of the battery pack and hindering future maintenance. Summary of the Invention

[0003] In view of this, this application provides a battery pack to at least solve the problems of poor connection reliability and high maintenance difficulty of the battery pack exhaust pipe in the prior art.

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows: This application provides a battery pack, including: a housing and a battery pack, a first exhaust pipe, a first flange and a second flange disposed in the housing; The first exhaust pipe includes a first pipe end and a second pipe end, the first pipe end being connected to the first flange, and the second pipe end being detachably connected to the housing; The battery pack is equipped with an air nozzle, and the second flange is connected to the air nozzle; the second flange is connected to the first flange to connect the air nozzle and the first exhaust pipe.

[0005] Optionally, the battery pack further includes: a first sealing ring; the first sealing ring is connected between the first flange and the second flange.

[0006] Optionally, the battery pack further includes: an adapter and a second exhaust pipe; both the adapter and the second exhaust pipe are located outside the housing, with the end of the second pipe passing through the housing and extending outside the housing; the adapter includes a first connecting end and a second connecting end disposed opposite to each other, the first connecting end being connected to the end of the second pipe, the second connecting end being connected to the second exhaust pipe, and the second exhaust pipe being used to connect to the vehicle floor.

[0007] Optionally, the adapter includes an adapter tube and a housing; the adapter tube includes an inner tube wall and an outer tube wall, one end of the inner tube wall forms the first connecting end, and the other end of the inner tube wall forms the second connecting end; the housing is connected to the first connecting end and the second connecting end, and the housing is threadedly connected to the outer tube wall.

[0008] Optionally, the adapter further includes a balancing vent valve, which is disposed inside the adapter tube and connected to the inner wall of the adapter tube.

[0009] Optionally, the adapter further includes a second sealing ring, which is connected to the first connecting end and / or the second connecting end.

[0010] Optionally, the battery pack further includes: a fixing member; the fixing member is connected to the end of the second exhaust pipe away from the adapter, and the fixing member is used to fix the second exhaust pipe to the vehicle body.

[0011] Optionally, the battery pack further includes a dust cover; the dust cover is connected to the end of the second exhaust pipe away from the adapter.

[0012] Optionally, the first exhaust pipe and / or the second exhaust pipe are high-density polyethylene pipes.

[0013] Optionally, the inner diameter of the first exhaust pipe gradually increases along the direction from the first pipe end to the second pipe end.

[0014] Optionally, the outer diameter of the first exhaust pipe is constant.

[0015] Optionally, the first exhaust pipe includes an inner pipe wall, the portion of which near the first pipe end is covered with a fireproof layer.

[0016] Optionally, the number of the first pipe ends is at least two, and each first pipe end is connected to a first flange; the number of the air nozzles is at least two, and each air nozzle is connected to a second flange; each second flange is connected to a corresponding first flange.

[0017] Compared with the prior art, the battery pack described in this application has the following advantages: The battery pack of this application utilizes a first flange and a second flange to connect the first vent pipe to the battery pack. This allows for the discharge of thermal runaway gases generated during thermal runaway of the battery pack to the outside of the casing. Compared to existing technologies, this eliminates the need for quick-connect fittings, effectively improving the reliability of the connection between the first vent pipe and the battery pack. It effectively prevents loosening of the connection between the first vent pipe and the battery pack under conditions of vibration, impact, or internal thermal expansion stress, meeting the high sealing requirements of the battery pack. Furthermore, the connection between the first and second flanges, as well as the connection between the first vent pipe and the casing, are all detachable, facilitating subsequent disassembly, maintenance, and cleaning of the first vent pipe, reducing maintenance difficulty and costs. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 An exploded view of the structure of a battery pack according to an embodiment of this application is shown; Figure 2 A cross-sectional schematic diagram of a battery pack according to an embodiment of this application is shown; Figure 3 This illustration shows a schematic diagram of a second flange connected to a battery pack according to an embodiment of this application; Figure 4 This illustration shows a schematic diagram of a first exhaust pipe connected to a battery pack according to an embodiment of this application; Figure 5 An embodiment of this application is shown. Figure 4 Enlarged schematic diagram of part I; Figure 6 This illustration shows a schematic diagram of the connection between a first exhaust pipe and a housing according to an embodiment of this application; Figure 7 An embodiment of this application is shown. Figure 6 Enlarged schematic diagram of section II; Figure 8 An embodiment of this application is shown. Figure 6 Enlarged schematic diagram of section III; Figure 9 A schematic diagram of an adapter according to an embodiment of this application is shown; Figure 10 A top view of a first exhaust pipe according to an embodiment of this application is shown; Figure 11 A schematic diagram of a first exhaust pipe according to an embodiment of this application is shown.

[0019] Explanation of reference numerals in the attached figures: 101 - Box body, 102 - Cover plate, 103 - Floor; 200 - Battery pack, 201 - Air nozzle, 202 - Exhaust passage; 300 - First exhaust pipe, 301 - First pipe end, 302 - Second pipe end, 303 - Fireproof layer, 304 - Screw; 401 - First flange, 402 - Second flange, 403 - First sealing ring, 404 - Bolt, 405 - Nut; 500-Adapter, 501-First connection end, 502-Second connection end, 51-Adapter pipe, 52-Housing shell, 53-Balance vent valve, 54-Second sealing ring, 55-Clamp; 600 - Second exhaust pipe, 601 - Fixing component, 602 - Third sealing ring, 603 - Dust cover. Detailed Implementation

[0020] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0022] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] The following is combined Figures 1 to 11 This application describes a battery pack provided in an embodiment.

[0025] Reference Figures 1 to 5 , Figure 1 An exploded view of the structure of a battery pack according to an embodiment of this application is shown. Figure 2 This paper shows a cross-sectional schematic diagram of a battery pack 200 according to an embodiment of this application. Figure 3This diagram illustrates a second flange 402 connected to a battery pack 200 according to an embodiment of this application. Figure 4 This diagram illustrates a connection between a first exhaust pipe 300 and a battery pack 200 according to an embodiment of this application. Figure 5 An embodiment of this application is shown. Figure 4 Enlarged schematic diagram of part I in the middle.

[0026] The battery pack provided in this application embodiment includes: a housing 101 and a battery pack 200, a first exhaust pipe 300, a first flange 401 and a second flange 402 disposed within the housing 101; the first exhaust pipe 300 includes a first pipe end 301 and a second pipe end 302, the first pipe end 301 is connected to the first flange 401, and the second pipe end 302 is detachably connected to the housing 101; the battery pack 200 is provided with an air nozzle 201, and the second flange 402 is connected to the air nozzle 201; the second flange 402 is connected to the first flange 401 to connect the air nozzle 201 and the first exhaust pipe 300.

[0027] Specifically, the housing 101 has a storage space in which the battery pack 200, the first exhaust pipe 300, the first flange 401, and the second flange 402 are all located. The battery pack also includes a cover plate 102, which is connected to the top of the housing 101. The cover plate 102 and the housing 101 are usually connected by fasteners. After the cover plate 102 is connected to the housing 101, the storage space becomes a closed space, which can prevent moisture, dust and other external elements from entering the storage space, thereby protecting the components in the storage space from damage.

[0028] The battery pack 200 is composed of several battery cells connected in series or parallel. For some battery packs with modules, the battery pack 200 may include one or more battery modules. For example... Figure 2 As shown, the battery pack 200 has an exhaust channel 202 on the side near the top, and a nozzle 201 is connected to the end of the exhaust channel 202. When the battery pack 200 experiences thermal runaway, the thermal runaway gas generated can flow from the exhaust channel 202 to the nozzle 201 and then be discharged from the nozzle 201.

[0029] like Figures 3 to 5 As shown, the second flange 402 is connected to the air nozzle 201, which protrudes from the surface of the battery pack 200 along its height direction. Figure 2As shown in the Z direction. The bottom of the second flange 402 can be connected to the air nozzle 201 by welding, snap-fit, threaded connection, etc., and the central hole of the second flange 402 is connected to the air hole in the air nozzle 201 to ensure that the thermal runaway gas discharged from the air nozzle 201 can smoothly enter the central hole of the second flange 402. In some embodiments, the central hole of the second flange 402 can be coaxially arranged with the air hole in the air nozzle 201 and communicate with each other.

[0030] The first exhaust pipe 300 is a hollow tubular structure. The first exhaust pipe 300 has a first pipe end 301 and a second pipe end 302 at its two ends along its axial direction. The first pipe end 301 is connected to the first flange 401, and the second pipe end 302 is detachably connected to the housing 101. The first pipe end 301 and the first flange 401 can be fixedly connected by welding, snap-fit, threaded connection, etc., and the second pipe end 302 and the housing 101 can be detachably connected by bolt connection, snap-fit ​​connection, etc.

[0031] like Figure 3 As shown, the second flange 402 has four to six bolt holes evenly distributed along its circumference. Correspondingly, the first flange 401 also has four to six bolt holes evenly distributed along its circumference. The diameter of the bolt holes in the second flange 402 matches the diameter of the bolt holes in the first flange 401. The first flange 401 and the second flange 402 are fixedly connected by the aforementioned evenly distributed circumferential bolt holes and the bolts inserted into these holes. Figure 5 As shown, bolt 404 is inserted into the bolt hole and fixed with nut 405, thereby connecting the first flange 401 and the second flange 402.

[0032] The first flange 401 is connected to the second flange 402, thereby forming a structure in which the first pipe end 301 of the first exhaust pipe 300 is connected to the first flange 401, the second pipe end 302 of the first exhaust pipe 300 is connected to the housing 101, the first flange 401 is connected to the second flange 402, and the second flange 402 is connected to the air nozzle 201 on the battery pack 200. The central hole of the first flange 401 is connected to the interior of the first exhaust pipe 300 and the central hole of the second flange 402, respectively. The central hole of the second flange 402 is connected to the air hole in the air nozzle 201, thereby forming a complete exhaust path that can discharge the thermal runaway gas generated when the battery pack 200 experiences thermal runaway to the outside of the housing 101 through the air nozzle 201, the second flange 402, the first flange 401, and the first exhaust pipe 300.

[0033] Therefore, in this embodiment of the battery pack, the connection between the first exhaust pipe 300 and the battery pack 200 is achieved using the first flange 401 and the second flange 402. This allows the thermal runaway gas generated when the battery pack 200 experiences thermal runaway to be discharged outside the housing 101. Compared to the prior art, this eliminates the need for quick-connect fittings, effectively improving the reliability of the connection between the first exhaust pipe 300 and the battery pack 200. It effectively prevents loosening of the connection between the first exhaust pipe 300 and the battery pack 200 under conditions of vibration, impact, or thermal expansion stress within the battery pack, thus meeting the high sealing requirements of the battery pack. Furthermore, the connection between the first flange 401 and the second flange 402, as well as the connection between the first exhaust pipe 300 and the housing 101, are all detachable, facilitating subsequent disassembly, maintenance, and cleaning of the first exhaust pipe 300, reducing maintenance difficulty and cost.

[0034] Optionally, in some embodiments of this application, such as Figure 5 As shown, the battery pack also includes a first sealing ring 403; the first sealing ring 403 is connected between the first flange 401 and the second flange 402. The first sealing ring 403 is made of a high-temperature resistant, aging-resistant, and tear-resistant elastic material, such as silicone rubber or fluororubber. One surface of the first sealing ring 403 abuts against the first flange 401, and the opposite surface abuts against the second flange 402, thereby sealing the gap between the first flange 401 and the second flange 402.

[0035] By adopting the above configuration, the leakage of thermal runaway gas from the connection between the first flange 401 and the second flange 402 can be effectively prevented, thus avoiding secondary safety hazards such as the accumulation of thermal runaway gas in the housing 101, which could cause the housing 101 to bulge, catch fire, or even explode. At the same time, it helps to prevent external air and water vapor from entering the first exhaust pipe 300 and the air nozzle 201 through the connection between the first flange 401 and the second flange 402, thereby maintaining the cleanliness of the first exhaust pipe 300 and the air nozzle 201.

[0036] In addition, during the process of fastening the first flange 401 and the second flange 402 with bolts, the first sealing ring 403 can buffer the contact stress caused by the bolt preload through its own elastic deformation, avoid local stress concentration caused by rigid contact between the flange surfaces of the first flange 401 and the second flange 402, thereby reducing the risk of deformation and loosening of the first flange 401 and the second flange 402, ensuring the sealing of the connection and meeting the high sealing requirements of the battery pack.

[0037] Refer to together Figure 6 and Figure 7 , Figure 6 This diagram illustrates a connection between a first exhaust pipe 300 and a housing 101 according to an embodiment of this application. Figure 7 An embodiment of this application is shown. Figure 6 Enlarged schematic diagram of part II.

[0038] Optionally, in some embodiments of this application, such as Figure 6 and Figure 7 As shown, the battery pack also includes an adapter 500 and a second exhaust pipe 600; both the adapter 500 and the second exhaust pipe 600 are located outside the housing 101, and the second pipe end 302 passes through the housing 101 and extends outside the housing 101; the adapter 500 includes a first connecting end 501 and a second connecting end 502 arranged opposite to each other, the first connecting end 501 is connected to the second pipe end 302, and the second connecting end 502 is connected to the second exhaust pipe 600, which is used to connect to the vehicle floor 103.

[0039] Specifically, such as Figure 7 As shown, the second end 302 of the first exhaust pipe 300 passes through the housing 101 and extends outside the housing 101. The portion of the first exhaust pipe 300 near the second end 302 is detachably connected to the housing 101 by screws 304. Thus, the first exhaust pipe 300 can discharge the thermal runaway gas generated by the thermal runaway of the battery pack 200 in the housing 101 to the outside of the housing 101. To prevent the thermal runaway gas from spreading randomly outside the housing 101 and leaking into the passenger compartment, this embodiment also provides an adapter 500 and a second exhaust pipe 600 outside the housing 101. The adapter 500 includes a first connecting end 501 and a second connecting end 502 disposed opposite to each other. The first connecting end 501 is connected to the second end 302 of the first exhaust pipe 300, and the second connecting end 502 is connected to the second exhaust pipe 600. The end of the second exhaust pipe 600 away from the adapter 500 is used to connect to the vehicle floor 103.

[0040] The above configuration further improves the exhaust path of the battery pack, allowing thermal runaway gases to flow from the first exhaust pipe 300 to the adapter 500, and then to the second exhaust pipe 600, where they are discharged to the outside of the vehicle floor 103. This prevents thermal runaway gases outside the housing 101 from leaking into the passenger compartment, protecting the lives of the occupants. Furthermore, the location of the second exhaust pipe 600 should be carefully avoided, avoiding high-temperature and flammable components in the vehicle, to enhance exhaust safety.

[0041] For example, the adapter 500 in this embodiment is a tubular connector with an overall length of approximately 20mm to 30mm to facilitate the connection between the first exhaust pipe 300 and the second exhaust pipe 600. The adapter 500 is made of high-temperature resistant engineering plastics, such as polyphenylene sulfide (PPS) or glass fiber reinforced nylon, and can withstand temperatures of not less than 120°C, meeting the environmental requirements of the entire vehicle.

[0042] Refer to together Figure 9 , Figure 9 A schematic diagram of an adapter 500 according to an embodiment of this application is shown.

[0043] Optionally, in some embodiments of this application, such as Figure 9 As shown, the adapter 500 includes an adapter tube 51 and a housing 52; the adapter tube 51 includes an inner tube wall and an outer tube wall, one end of the inner tube wall forms a first connection end 501, and the other end of the inner tube wall forms a second connection end 502; the housing 52 is connected to the first connection end 501 and the second connection end 502, and the housing 52 is threadedly connected to the outer tube wall.

[0044] Specifically, the adapter 51 is a hollow tubular structure with an inner wall and an outer wall. The inner wall is the wall of the adapter 51 closest to the center of the tube body, and the outer wall is the wall of the adapter 51 away from the center of the tube body. The inner wall forms a channel for gas flow. One end of the inner wall along its axial direction forms a first connecting end 501, and the other end of the inner wall along its axial direction forms a second connecting end 502. The diameter of the first connecting end 501 is approximately the same as the diameter of the second end 302 of the first exhaust pipe 300, for connection with the first exhaust pipe 300. The diameter of the second connecting end 502 is approximately the same as the diameter of the second exhaust pipe 600, for connection with the second exhaust pipe 600.

[0045] For example, the first connecting end 501 and the second connecting end 502 may be provided with threaded structures, and the pipe openings of the first exhaust pipe 300 and the second exhaust pipe 600 are provided with matching threaded structures, thereby achieving the connection between the first connecting end 501 and the first exhaust pipe 300 and the second connecting end 502 and the second exhaust pipe 600 through threaded connection. Furthermore, sealing rings may be provided at the first connecting end 501 and the second connecting end 502 respectively to ensure the airtightness of the first connecting end 501 and the second connecting end 502 and reduce the risk of thermal runaway gas leakage.

[0046] The outer casing 52 is connected to the first connecting end 501 and the second connecting end 502. The outer wall of the adapter pipe 51 has external threads, and the inner side of the outer casing 52 has internal threads, thus the adapter pipe 51 and the outer casing 52 are tightened and fixed through a threaded connection. In this way, the inner wall of the adapter pipe 51 is threadedly connected to the first exhaust pipe 300 and the second exhaust pipe 600, and the outer wall of the adapter pipe 51 is threadedly connected to the outer casing 52. By rotating the adapter pipe 51 with a tightening tool, the adapter 500 can be locked and fixed. In some embodiments, a clip 55 is connected to the inner wall of the adapter pipe 51, and a groove adapted to the shape of the clip 55 is provided on the inner side of the outer casing 52. When the clip 55 is engaged in the groove during the rotation of the adapter pipe 51 with a tightening tool, the adapter 500 can be locked and fixed.

[0047] The adapter 500 adopts the above-mentioned locking and fixing method, which enables the adapter 500 to be quickly connected to the first exhaust pipe 300 and the second exhaust pipe 600, simplifying the assembly process and improving assembly efficiency. At the same time, when disassembly and maintenance are required, the adapter pipe 51 can be rotated in the opposite direction to release the lock of the adapter 500, which facilitates the disassembly and maintenance of the adapter 500 and also facilitates the cleaning and maintenance of the first exhaust pipe 300 and the second exhaust pipe 600.

[0048] Optionally, in some embodiments of this application, such as Figure 9 As shown, the adapter 500 also includes a balancing vent valve 53, which is located inside the adapter pipe 51 and connected to the inner wall of the adapter pipe 51. Specifically, the balancing vent valve 53 is a functional component used to adjust the pressure balance between the inside and outside of the adapter pipe 51. It typically adopts a diaphragm or valve core structure and is integrated into the inside of the adapter pipe 51. For example, the balancing vent valve 53 can be fixed to a preset mounting hole on the inner wall by a snap-fit, and it can automatically open or close under specific pressure conditions. When pressure fluctuations occur inside the adapter pipe 51 due to poor gas flow, the valve will automatically open, allowing outside air to enter the adapter pipe 51 through the venting channel inside the valve, avoiding pipe collapse or loosening due to negative pressure. When the inside of the adapter pipe 51 is at normal exhaust pressure, the valve will automatically close under pressure, ensuring that thermal runaway gas is discharged only along the second exhaust pipe 600 and that reverse leakage does not occur. This helps to ensure the stability of the battery pack exhaust system.

[0049] Optionally, in some embodiments of this application, such as Figure 9 As shown, the adapter 500 also includes a second sealing ring 54, which is connected to the first connecting end 501 and / or the second connecting end 502. The second sealing ring 54 is made of a high-temperature resistant, aging-resistant, and tear-resistant elastic material, such as silicone rubber or fluororubber. There can be one second sealing ring 54 connected to either the first connecting end 501 or the second connecting end 502. Alternatively, there can be two second sealing rings connected to the first connecting end 501 and the second connecting end 502 respectively. This achieves sealing between the inner wall of the adapter pipe 51 at the first connecting end 501 and the first exhaust pipe 300, as well as sealing between the inner wall of the adapter pipe 51 at the second connecting end 502 and the second exhaust pipe 600.

[0050] By adopting the above configuration, the leakage of thermal runaway gas from the first connection end 501 and the second connection end 502 can be effectively prevented, thus avoiding the situation where thermal runaway gas diffuses randomly outside the enclosure 101 and leaks into the passenger compartment. At the same time, it helps to prevent external air, water vapor, etc. from entering the first exhaust pipe 300 and the second exhaust pipe 600 through the first connection end 501 and the second connection end 502, thereby maintaining the cleanliness of the first exhaust pipe 300 and the second exhaust pipe 600.

[0051] Refer to together Figure 8 , Figure 8 An embodiment of this application is shown. Figure 6 Enlarged schematic diagram of part III.

[0052] Optionally, in some embodiments of this application, the battery pack further includes a fixing member 601; the fixing member 601 is connected to the end of the second exhaust pipe 600 away from the adapter 500, and the fixing member 601 is used to fix the second exhaust pipe 600 to the vehicle body. The end of the second exhaust pipe 600 away from the adapter 500 faces downwards towards the vehicle floor 103, forming a near 90° angle with the floor 103, which helps to prevent the discharged thermal runaway gases from directly contacting pedestrians or vehicle components. Figure 8 As shown, the fastener 601 can be an I-shaped rubber pad, which is connected to the vehicle floor 103. This helps to buffer the transmission of vibrations during vehicle operation to the second exhaust pipe 600, reduce fatigue damage to the second exhaust pipe 600, prevent loosening of the connection, and improve abnormal noise or wear. At the same time, the flexible rubber structure can also absorb the expansion or contraction of the second exhaust pipe 600 caused by temperature changes, and prevent stress concentration from causing the second exhaust pipe 600 to break.

[0053] In some embodiments, a third sealing ring 602 is provided around the fastener 601. The third sealing ring 602 can seal the gap between the fastener 601 and the vehicle floor 103, improve the abnormal noise or wear caused by contact friction between the fastener 601 and the vehicle floor 103, improve the durability of the fastener 601, and at the same time improve the airtightness of the connection part, further preventing thermal runaway gas from leaking from the connection part to the floor 103 and spreading into the passenger compartment.

[0054] Optionally, based on the above embodiments, such as Figure 8 As shown, the battery pack also includes a dust cover 603; the dust cover 603 is connected to the end of the second exhaust pipe 600 away from the adapter 500. The dust cover 603 prevents large particles or debris from entering the second exhaust pipe 600, thereby maintaining the cleanliness of the second exhaust pipe 600.

[0055] Optionally, in some embodiments of this application, the first exhaust pipe 300 and / or the second exhaust pipe 600 are high-density polyethylene pipes, that is, high-density polyethylene (HDPE) is used as the main material. By utilizing the excellent flexibility, weather resistance and low cost of high-density polyethylene, the problem of excessive rigidity and easy breakage due to vibration or temperature stress caused by the use of nylon pipes in traditional exhaust pipes can be effectively solved.

[0056] Optionally, in some embodiments of this application, the inner diameter of the first exhaust pipe 300 gradually increases along the direction from the first pipe end 301 to the second pipe end 302. That is, the inner diameter of the first exhaust pipe 300 gradually increases along the exhaust direction of the thermal runaway gas. This configuration optimizes the hydrodynamic path, reduces gas flow eddies and back pressure, lowers airflow resistance, and thus improves the exhaust efficiency of the first exhaust pipe 300. Simultaneously, it also helps reduce heat accumulation within the first exhaust pipe 300, avoids localized overheating, protects the structural integrity of the first exhaust pipe 300, and enhances exhaust safety.

[0057] Optionally, based on the above embodiments, the outer diameter of the first exhaust pipe 300 is further set to be constant. Specifically, a constant outer diameter means that the outer periphery of the first exhaust pipe 300 is regular and uniform, thus eliminating the need to design dedicated assembly components for different pipe diameter areas, ensuring the adaptability and assembly efficiency of the first exhaust pipe 300. In addition, since the storage space inside the battery pack housing 101 is limited, and it is necessary to avoid other components such as the battery pack 200, wiring harness, and cooling pipes, the constant outer diameter of the first exhaust pipe 300 facilitates the planning of a compact installation path within the housing 101, eliminating the need to reserve additional clearance space to accommodate changes in outer diameter, thereby effectively improving the space utilization rate within the housing 101. For example, the wall thickness of the first exhaust pipe 300 near the first pipe end 301 can be set to about 2.5mm to 3mm. As the inner diameter gradually increases while the outer diameter remains constant, the wall thickness of the first exhaust pipe 300 near the second pipe end 302 will be reduced to about 1.5mm to 2.5mm. Based on the displacement requirements of the thermal runaway gas of the battery pack, the outer diameter of the first exhaust pipe 300 can be set to about 18mm.

[0058] Refer to together Figure 10 , Figure 10 A top view of a first exhaust pipe 300 according to an embodiment of this application is shown.

[0059] Optionally, in some embodiments of this application, the first exhaust pipe 300 includes an inner pipe wall, and the portion of the inner pipe wall near the first pipe end 301 is covered with a fireproof layer 303. The inner pipe wall of the first exhaust pipe 300 is the pipe wall on the side of the first exhaust pipe 300 closest to the center of the pipe body. Since the first pipe end 301 of the first exhaust pipe 300 is connected to the battery pack 200, thermal runaway gas flows from the first pipe end 301 to the second pipe end 302, resulting in a higher temperature closer to the first pipe end 301. Therefore, in this embodiment, the portion of the inner pipe wall near the first pipe end 301 is covered with a fireproof layer 303, forming a double-protection structure. This helps to suppress flame spread, reduce the risk of combustion caused by thermal runaway gas contacting the inner pipe wall, improve overall safety, and ensure that the first exhaust pipe 300 maintains structural integrity even under extreme operating conditions.

[0060] For example, a high-temperature fire-retardant coating of approximately 0.5 mm thickness is sprayed onto the inner wall of the pipe near the first pipe end 301, and the cut-off position of the high-temperature fire-retardant coating is as follows: Figure 10 As shown in positions A and B, the high-temperature fireproof coating can be a ceramic-based composite coating or an intumescent fireproof coating. The coating can withstand temperatures of not less than 180℃, effectively isolating the high-temperature thermal runaway gas from direct contact with the inner pipe wall, and preventing the first exhaust pipe 300 from softening and deforming due to local high temperature, thus affecting the exhaust effect.

[0061] Refer to together Figure 11 , Figure 11 A schematic diagram of a first exhaust pipe 300 according to an embodiment of this application is shown.

[0062] Optionally, in some embodiments of this application, the number of first pipe ends 301 is at least two, and each first pipe end 301 is connected to a first flange 401; the number of air nozzles 201 is at least two, and each air nozzle 201 is connected to a second flange 402; each second flange 402 is connected to a corresponding first flange 401.

[0063] Specifically, such as Figure 11 As shown, the first exhaust pipe 300 is composed of multiple sub-pipes connected together, thus having at least two first pipe ends 301. Each first pipe end 301 is connected to a first flange 401, and the connection methods include, but are not limited to, welding, snap-fit, and threaded connection. It should be noted that the number of first pipe ends 301 is consistent with the number of air nozzles 201 on the battery pack 200. For example, the battery pack 200 may include two or more blocks, with the battery cells in each block connected in series or parallel. Each block may have an exhaust channel 202 and an air nozzle 201, so that the entire battery pack 200 may include two or more air nozzles 201. Each block may refer to a battery module.

[0064] Each nozzle 201 is connected to a second flange 402. The connection method includes, but is not limited to, welding, snap-fit, and threaded connection. The number of second flanges 402 is the same as the number of first flanges 401, and their positions correspond. Each second flange 402 is connected to a corresponding first flange 401, achieving independent connection between multiple first pipe ends 301 and multiple nozzles 201. Figure 1 and Figure 11 The figure shows that there are four first pipe ends 301, and the battery pack 200 is provided with four air nozzles 201, four first flanges 401 and four second flanges 402. The structure of the first exhaust pipe 300 near the first pipe end 301 is "I" shaped to facilitate connection with the four air nozzles 201.

[0065] With the above configuration, the connection position of the first pipe end 301 of the first exhaust pipe 300 can be flexibly planned according to the actual distribution of the air nozzles 201 of the battery pack 200, eliminating the need for complex branch pipe adjustments and simplifying the layout design of the first exhaust pipe 300 within the housing 101. Furthermore, since two or more first pipe ends 301 converge on the same pipe body—the main structure of the first exhaust pipe 300—compared to multiple independent exhaust pipes, this reduces the space occupied by the pipes within the housing 101, reserving more installation space for the battery pack 200, wiring harnesses, and other components, thus improving the overall utilization rate of the space within the housing 101.

[0066] In the description of this specification, references to terms such as "some embodiments," "one implementation," and "exemplary" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, The battery pack includes: a housing (101) and a battery pack (200), a first exhaust pipe (300), a first flange (401) and a second flange (402) disposed in the housing (101); The first exhaust pipe (300) includes a first pipe end (301) and a second pipe end (302). The first pipe end (301) is connected to the first flange (401), and the second pipe end (302) is detachably connected to the housing (101). The battery pack (200) is provided with a gas nozzle (201), and the second flange (402) is connected to the gas nozzle (201); the second flange (402) is connected to the first flange (401) to connect the gas nozzle (201) and the first exhaust pipe (300).

2. The battery pack according to claim 1, characterized in that, The battery pack further includes: a first sealing ring (403); the first sealing ring (403) is connected between the first flange (401) and the second flange (402).

3. The battery pack according to claim 1, characterized in that, The battery pack also includes: an adapter (500) and a second exhaust pipe (600); The adapter (500) and the second exhaust pipe (600) are both located outside the housing (101), and the second pipe end (302) passes through the housing (101) and extends out of the housing (101); The adapter (500) includes a first connecting end (501) and a second connecting end (502) disposed opposite to each other. The first connecting end (501) is connected to the second pipe end (302), and the second connecting end (502) is connected to the second exhaust pipe (600).

4. The battery pack according to claim 3, characterized in that, The adapter (500) includes an adapter tube (51) and a housing (52); The adapter pipe (51) includes an inner pipe wall and an outer pipe wall. One end of the inner pipe wall forms the first connection end (501), and the other end of the inner pipe wall forms the second connection end (502). The outer shell (52) is connected to the first connecting end (501) and the second connecting end (502), and the outer shell (52) is threadedly connected to the outer tube wall.

5. The battery pack according to claim 4, characterized in that, The adapter (500) also includes a balance vent valve (53), which is located inside the adapter pipe (51) and connected to the inner wall of the adapter pipe (51).

6. The battery pack according to claim 4, characterized in that, The adapter (500) also includes a second sealing ring (54), which is connected to the first connecting end (501) and / or the second connecting end (502).

7. The battery pack according to claim 3, characterized in that, The battery pack further includes a fixing member (601); the fixing member (601) is connected to the end of the second exhaust pipe (600) away from the adapter (500).

8. The battery pack according to claim 3, characterized in that, The battery pack also includes a dust cover (640); the dust cover (640) is connected to the end of the second exhaust pipe (600) away from the adapter (500).

9. The battery pack according to claim 3, characterized in that, The first exhaust pipe (300) and / or the second exhaust pipe (600) are high-density polyethylene pipes.

10. The battery pack according to claim 1, characterized in that, Along the direction from the first pipe end (301) toward the second pipe end (302), the inner diameter of the first exhaust pipe (300) gradually increases.

11. The battery pack according to claim 10, characterized in that, The outer diameter of the first exhaust pipe (300) is constant.

12. The battery pack according to claim 1, characterized in that, The first exhaust pipe (300) includes an inner pipe wall, and the portion of the inner pipe wall near the first pipe end (301) is covered with a fireproof layer (303).

13. The battery pack according to claim 1, characterized in that, The number of the first pipe end (301) is at least two, and each first pipe end (301) is connected to a first flange (401). The number of air nozzles (201) is at least two, and each air nozzle (201) is connected to a second flange (402); each second flange (402) is connected to a corresponding first flange (401).

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