A carbon tank shell, a bionic structure welding rib and a welding method thereof

Abstract

The application discloses a bionic structure welding rib for welding of a carbon tank non-woven fabric and a carbon tank shell, and belongs to the technical field of motor vehicle carbon tanks. The welding rib is integrally formed on the surface of a welding area of the carbon tank shell, and comprises a plurality of protruding welding teeth arranged at intervals along a preset welding path, and the plurality of welding teeth jointly form a gear-shaped bionic structure. Each welding tooth has a tooth top working surface, and a tooth gap is arranged between adjacent welding teeth. During welding, an ultrasonic welding head presses the non-woven fabric towards the welding rib, the tooth top working surface focuses energy on a local area to form an independent welding spot, and molten overflow flows into the tooth gap for temporary storage. The application significantly improves the tear resistance by using a multi-point discrete welding structure, avoids overheating and brittleness of the base material, realizes clean welding, maximally retains the filtering area of the non-woven fabric, and the layout path of the welding rib can be flexibly adjusted according to the specifications of the carbon tank, and the adaptability is high.

Description

Technical Field

[0001] This invention relates to the field of carbon canister technology for motor vehicles, specifically to a carbon canister shell, a biomimetic structural welding rib integrated on the carbon canister shell, and a welding method thereof. Background Technology

[0002] The carbon canister is a crucial component of the vehicle's fuel evaporation control system. It is filled with activated carbon, and both ends are sealed with non-woven fabric to prevent activated carbon particles from leaking out. In existing technologies, the non-woven fabric is often fixed to the carbon canister shell using ultrasonic welding, with the welding rod typically designed as a straight, linear structure. While this creates a continuous straight weld mark, meeting basic fixing requirements, it still has the following shortcomings in practical use:

[0003] 1. Poor tear resistance: When a straight weld is subjected to stress, cracks are prone to propagate along the edge of the weld line. Once micro-cracks appear, the entire weld can easily fail.

[0004] 2. Thermal stress concentration: The heat accumulates severely in the continuous welding area, which can easily cause the non-woven fabric substrate to become brittle due to overheating, lose its flexibility, and affect the long-term reliability of the carbon canister.

[0005] 3. Difficulty in controlling overflow: During the welding process, molten plastic is easily squeezed out of the weld edge, forming burrs, which not only affect the appearance, but may also fall into the carbon canister and cause pollution;

[0006] 4. Filter area loss: When the straight welding rod is too long, it will block the effective air permeability area of ​​the non-woven fabric and affect the ventilation efficiency of the carbon canister. Summary of the Invention

[0007] To address the technical problems and shortcomings of existing technologies, this invention provides a biomimetic structural welding rib integrated into the carbon canister shell and its welding method. Through biomimetic structural design, it solves the problems of poor tear resistance, large thermal damage, difficulty in controlling overflow, and loss of filtration area in existing technologies.

[0008] To achieve the above and other related objectives, the present invention adopts the following technical solution:

[0009] A biomimetic structural welding rib integrated into a carbon canister shell includes a welding rib integrally formed on the welding area surface of the carbon canister shell. The welding rib includes a plurality of raised welding teeth arranged at intervals along a preset welding path. Each welding tooth has a tooth tip working surface, which is used to form point contact with the non-woven fabric covering it during ultrasonic welding, and to focus and release energy in a local area under the action of ultrasonic energy, so that the non-woven fabric in this area is fused with the carbon canister shell to form an independent weld point. An inter-tooth groove is provided between adjacent welding teeth, which forms an overflow receiving space and a heat conduction buffer area.

[0010] Preferably, the plurality of welding teeth are arranged along the preset welding path to form a gear-shaped biomimetic structure.

[0011] Preferably, the preset welding path is annular, rectangular, or irregular in shape, and its shape and size match the edge contour of the nonwoven fabric to be welded.

[0012] Preferably, the width of the welding tooth tip is L, the width of the groove between adjacent teeth is D, and the ratio of L to D is 1:1.5 to 1:3.

[0013] Preferably, the height H of the welding teeth is 0.5mm-1.2mm, and H is greater than the amount of compression deformation of the nonwoven fabric under welding pressure, so as to ensure that the bottom of the groove between the teeth remains in a non-contact state with the nonwoven fabric during the welding process.

[0014] On the other hand, a carbon canister shell is also provided, wherein the welding area of ​​the carbon canister shell is provided with biomimetic welding ribs as described above.

[0015] Furthermore, a nonwoven fabric welding method using the aforementioned carbon canister shell is also provided, comprising the following steps:

[0016] Step 1: Cover the non-woven fabric to be welded over the welding area of ​​the carbon canister shell, so that the non-woven fabric is in contact with or close to the tips of the welding teeth of the welding rib.

[0017] Step 2: Place the welding head of the ultrasonic welding equipment above the non-woven fabric;

[0018] Step 3: Start the ultrasonic welding equipment. Under pressure, the welding head presses the non-woven fabric against the welding ribs on the surface of the shell. The tips of each welding tooth focus the ultrasonic energy on the corresponding area, causing the non-woven fabric and the shell to partially melt and bond together, forming multiple spaced independent welding points.

[0019] Step 4: During the welding process, the molten material flows into the groove between the teeth of the weld bead under pressure and is temporarily stored to prevent it from overflowing into the weld area;

[0020] Step 5: After welding is completed, lift the welding head to obtain a carbon canister assembly in which the non-woven fabric and the carbon canister shell are fixed at multiple points.

[0021] More preferably, the welding head is a flat welding head or a contour welding head that resembles the surface of the carbon canister shell.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] Firstly, stress dispersion and tear resistance enhancement: The gear-shaped multi-point welded rib structure on the carbon canister shell transforms the traditional continuous weld into a discrete, lattice-like connection. When a weld point is subjected to localized stress, the crack cannot propagate continuously in a straight line due to the unwelded areas between adjacent weld points (i.e., the unconnected areas corresponding to the grooves between the teeth), and is forced to terminate at the weld gap. This structural design of the shell itself is equivalent to constructing multiple crack-preventing barriers between the non-woven fabric and the shell, significantly improving tear resistance compared to traditional linear welding.

[0024] Secondly, the design incorporates a heat conduction gradient buffer and substrate protection. The welding ribs on the shell form a discontinuous heat-affected zone: the raised portions of the welding teeth are in close contact with the fabric, allowing for concentrated heat release and fusion; while the grooved portions between the teeth do not contact the fabric or have minimal contact pressure during welding, effectively blocking heat conduction and forming a heat buffer zone. This design eliminates the continuous heat-affected zone caused by a "one-size-fits-all" approach to heat transfer, avoiding the substrate overheating and brittleness problems associated with traditional planar welding or continuous rib welding. While ensuring connection strength, it maximizes the preservation of the nonwoven fabric's flexibility.

[0025] Thirdly, energy focusing and efficient welding: The micro-convex structure design of the welding teeth allows ultrasonic energy to be highly focused on a tiny area at the moment of contact, significantly improving the local energy density. This energy focusing effect not only makes the weld joint stronger, but also appropriately reduces the overall welding power or shortens the welding time, saving energy and reducing the thermal impact on non-welded areas.

[0026] Fourthly, overflow guidance and clean welding: The grooves between the teeth form natural overflow cavities during welding. Molten plastic, under pressure, preferentially flows into the grooves with less resistance and is temporarily stored within them. After cooling, it forms a regular overflow ridge, rather than scattered burrs at the weld edge. This design effectively prevents molten plastic from being squeezed out of the weld edge, leading to brittle welds, a dirty appearance, and overflow contamination of the carbon canister, thus achieving clean welding.

[0027] Fifthly: Maximizing the retention of filtration area; the spacing of weld points ensures that the effective air permeability area of ​​the non-woven fabric is preserved to the maximum extent, avoiding the continuous obstruction of the non-woven fabric filtration area by traditional long straight weld ribs, thus guaranteeing the ventilation performance and adsorption efficiency of the carbon canister.

[0028] Sixthly: Integrated design improves positioning accuracy and assembly efficiency; the welding ribs are directly integrally formed onto the carbon canister shell, transforming the traditional alignment method that relies on the precision of welding tooling into a structural feature of the product itself. This integrated design eliminates alignment errors between the welding tooling and the shell, improves welding positioning accuracy, simplifies tooling complexity, and reduces production costs.

[0029] Seventh aspect: Biomimetic micro-touch structure optimizes energy distribution and prevents adhesion; the gear-shaped biomimetic structure simulates the efficient energy transfer and distribution mechanism in nature. Through the alternating arrangement of tooth tips and grooves, the ultrasonic energy is optimized in the welding area. The alternating arrangement of tooth tips and grooves not only achieves energy focusing and dispersion, but also significantly reduces the contact area between the welding tool and the nonwoven fabric, reduces the demolding resistance when the welding head is lifted after welding, and effectively prevents secondary tearing of the nonwoven fabric due to adhesion.

[0030] Eighthly, the design offers high flexibility and product versatility. The placement path of the welding ribs is not fixed but is designed based on the specific specifications of the carbon canister shell and the contour of the non-woven fabric edge ring. Whether the welding area is circular, rectangular, or irregular, a perfect match can be achieved by adjusting the direction of the welding ribs. This high degree of design flexibility allows this technical solution to be applied to carbon canister products of different models and sizes, eliminating the need to redesign complex welding fixtures, significantly shortening the product development cycle, and reducing mold manufacturing costs.

[0031] Other additional advantages and benefits of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of a half-section of the carbon canister shell;

[0034] Figure 2 This is a schematic diagram of the internal structure of the carbon canister shell;

[0035] Figure 3 yes Figure 2 Enlarged view of section A;

[0036] Figure 4 This is a schematic diagram of the welding tooth dimensions.

[0037] Explanation of reference numerals for major components:

[0038] 1. Carbon canister shell; 2. Welding ribs; 3. Welding teeth; 4. Non-woven fabric; 5. Carbon powder; 6. Tooth top working surface; 7. Inter-tooth groove; 8. Adsorption port; 9. Desorption port; 10. Atmosphere port. Detailed Implementation

[0039] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. The following specific examples illustrate the embodiments of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0040] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be changed at will, and the layout of the components may also be more complex.

[0041] It should be noted that in the description of this application, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention. Furthermore, it should be noted that in the description of this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," etc., 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 communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in the invention based on the specific circumstances.

[0042] Example 1:

[0043] This invention discloses a biomimetic structural welding rib 2 integrated on the carbon canister shell 1, combined with... Figures 1-4The welding rib 2 is integrally formed on the welding area surface of the carbon canister shell 1. The welding rib 2 includes multiple raised welding teeth 3 arranged at intervals along a preset welding path. Each welding tooth 3 has a tooth tip working surface 6, which is used to form point contact with the non-woven fabric 4 covering it during ultrasonic welding, and to focus and release energy to a local area under the action of ultrasonic energy, causing the non-woven fabric 4 in that area to fuse with the carbon canister shell 1 to form an independent weld point. An inter-tooth groove 7 is provided between adjacent welding teeth 3, forming an overflow receiving space and a heat conduction buffer area. Multiple welding teeth 3 are arranged along the preset welding path to form a gear-like biomimetic structure. The preset welding path is annular, rectangular, or irregular in shape, and its shape and size match the edge contour of the non-woven fabric 4 to be welded. In this solution, reference is made to... Figure 3 and Figure 4 It is understood that the width of the tooth tip of the welding tooth 3 is L, and the width of the adjacent groove 7 is D. The ratio of L to D is 1:1.5 to 1:3. The height H of the welding tooth 3 is 0.5mm-1.2mm, and H is greater than the amount of compression deformation of the nonwoven fabric 4 under welding pressure, so as to ensure that the bottom of the groove 7 between the teeth remains in a non-contact state with the nonwoven fabric 4 during the welding process.

[0044] The variables for Experiment 1 are controlled as follows:

[0045] Fixed parameters: H=0.8mm (intermediate value), welding pressure 1.5MPa, welding time 2s; test ratios: 1:1.5, 1:2, 1:2.5, 1:3; tooth tip width L: 0.3mm.

[0046] Test results:

[0047] L:D ratio Welding strength (N / 50mm) Nonwoven fabric surface deformation (mm) Contact state at the bottom of the tooth groove 1:1.5 45.2 0.12 Non-contact (gap 0.05mm) 1:2 42.8 0.09 Non-contact (gap 0.08mm) 1:2.5 38.5 0.07 Non-contact (gap 0.12mm) 1:3 35.1 0.05 Non-contact (gap 0.15mm)

[0048] The conclusions are as follows: As the L:D ratio increases (groove widens), the welding strength gradually decreases (due to the reduced contact area at the tooth tip), but the deformation of the nonwoven fabric decreases significantly, and all conditions are met for non-contact welding. A ratio of 1:1.5 to 1:2.5 (balances strength and deformation control appropriately) is suitable.

[0049] The variables for Experiment 2 are controlled as follows:

[0050] Fixed parameters: L:D=1:2, welding pressure 1.5MPa, welding time 2s; test H value: 0.3mm (below the lower limit), 0.5mm, 0.8mm, 1.2mm, 1.5mm (above the upper limit); non-woven fabric compression deformation (reference value): 0.4mm (measured before testing).

[0051] Test results:

[0052] H value (mm) Welding strength (N / 50mm) Contact state at the bottom of the tooth groove Residual deformation of nonwoven fabric (mm) 0.3 28.7 Contact (compression deformation penetration) 0.45 (overcompressed) 0.5 39.5 Critical contact (micro-touch) 0.38 0.8 42.8 Non-contact (gap 0.08mm) 0.09 1.2 41.2 Non-contact (gap 0.48mm) 0.08 1.5 40.9 Non-contact (gap 0.78mm) 0.07

[0053] The conclusions are as follows: When H < 0.5 mm, the bottom of the tooth groove contacts the non-woven fabric, leading to a decrease in welding strength and excessive material deformation. When H ≥ 0.5 mm, the non-contact condition is met, and the welding strength is stable within the range of 0.8-1.2 mm. Recommended range: 0.5 mm as the lower limit and 1.2 mm as the upper limit (to avoid excessive tooth height leading to increased process costs).

[0054] Example 2:

[0055] You can continue to refer to this. Figure 1-4 Understood, this solution provides a carbon canister shell 1, the welding area of ​​which is provided with biomimetic welding ribs 2 as shown in Embodiment 1. A cover is provided at the top of the carbon canister shell, and an adsorption port 8, a desorption port 9, and an atmospheric port 10 are respectively provided below. After non-woven fabric is welded onto the carbon canister shell 1, carbon powder can be loaded.

[0056] Example 3:

[0057] This solution provides a welding method for the nonwoven fabric 4 using the aforementioned carbon canister shell 1, including the following steps:

[0058] Step 1: Cover the non-woven fabric 4 to be welded over the welding area of ​​the carbon canister shell 1, so that the non-woven fabric 4 is in contact with or close to the tips of the welding teeth 3 of the welding rib 2.

[0059] Step 2: Place the welding head of the ultrasonic welding equipment above the non-woven fabric 4;

[0060] Step 3: Start the ultrasonic welding equipment. Under pressure, the welding head presses the non-woven fabric 4 against the welding rib 2 on the surface of the shell. The tip of each welding tooth 3 focuses the ultrasonic energy on the corresponding area, so that the non-woven fabric 4 and the shell are locally melted and bonded together to form multiple spaced independent welding points.

[0061] Step 4: During the welding process, the molten material flows into the interdental groove 7 of the welding rib 2 under pressure and is temporarily stored to prevent it from overflowing into the weld area;

[0062] Step 5: After welding is completed, lift the welding head to obtain a carbon canister assembly in which the non-woven fabric 4 is fixed to the carbon canister shell 1 at multiple points.

[0063] More preferably, the welding head is a flat welding head or a contour welding head that resembles the surface of the carbon canister shell 1.

[0064] In summary, the welded rib design, the carbon canister shell with welded ribs, and the welding method involved in this solution have the following advantages compared with traditional technologies.

[0065] Firstly, stress dispersion and tear resistance enhancement: The gear-shaped multi-point welded rib structure on the carbon canister shell transforms the traditional continuous weld into a discrete, lattice-like connection. When a weld point is subjected to localized stress, the crack cannot propagate continuously in a straight line due to the unwelded areas between adjacent weld points (i.e., the unconnected areas corresponding to the grooves between the teeth), and is forced to terminate at the weld gap. This structural design of the shell itself is equivalent to constructing multiple crack-preventing barriers between the non-woven fabric and the shell, significantly improving tear resistance compared to traditional linear welding.

[0066] Secondly, the design incorporates a heat conduction gradient buffer and substrate protection. The welding ribs on the shell form a discontinuous heat-affected zone: the raised portions of the welding teeth are in close contact with the fabric, allowing for concentrated heat release and fusion; while the grooved portions between the teeth do not contact the fabric or have minimal contact pressure during welding, effectively blocking heat conduction and forming a heat buffer zone. This design eliminates the continuous heat-affected zone caused by a "one-size-fits-all" approach to heat transfer, avoiding the substrate overheating and brittleness problems associated with traditional planar welding or continuous rib welding. While ensuring connection strength, it maximizes the preservation of the nonwoven fabric's flexibility.

[0067] Thirdly, energy focusing and efficient welding: The micro-convex structure design of the welding teeth allows ultrasonic energy to be highly focused on a tiny area at the moment of contact, significantly improving the local energy density. This energy focusing effect not only makes the weld joint stronger, but also appropriately reduces the overall welding power or shortens the welding time, saving energy and reducing the thermal impact on non-welded areas.

[0068] Fourthly, overflow guidance and clean welding: The grooves between the teeth form natural overflow cavities during welding. Molten plastic, under pressure, preferentially flows into the grooves with less resistance and is temporarily stored within them. After cooling, it forms a regular overflow ridge, rather than scattered burrs at the weld edge. This design effectively prevents molten plastic from being squeezed out of the weld edge, leading to brittle welds, a dirty appearance, and overflow contamination of the carbon canister, thus achieving clean welding.

[0069] Fifthly: Maximizing the retention of filtration area; the spacing of weld points ensures that the effective air permeability area of ​​the non-woven fabric is preserved to the maximum extent, avoiding the continuous obstruction of the non-woven fabric filtration area by traditional long straight weld ribs, thus guaranteeing the ventilation performance and adsorption efficiency of the carbon canister.

[0070] Sixthly: Integrated design improves positioning accuracy and assembly efficiency; the welding ribs are directly integrally formed onto the carbon canister shell, transforming the traditional alignment method that relies on the precision of welding tooling into a structural feature of the product itself. This integrated design eliminates alignment errors between the welding tooling and the shell, improves welding positioning accuracy, simplifies tooling complexity, and reduces production costs.

[0071] Seventh aspect: Biomimetic micro-touch structure optimizes energy distribution and prevents adhesion; the gear-shaped biomimetic structure simulates the efficient energy transfer and distribution mechanism in nature. Through the alternating arrangement of tooth tips and grooves, the ultrasonic energy is optimized in the welding area. The alternating arrangement of tooth tips and grooves not only achieves energy focusing and dispersion, but also significantly reduces the contact area between the welding tool and the nonwoven fabric, reduces the demolding resistance when the welding head is lifted after welding, and effectively prevents secondary tearing of the nonwoven fabric due to adhesion.

[0072] Eighthly, the design offers high flexibility and product versatility. The placement path of the welding ribs is not fixed but is designed based on the specific specifications of the carbon canister shell and the contour of the non-woven fabric edge ring. Whether the welding area is circular, rectangular, or irregular, a perfect match can be achieved by adjusting the direction of the welding ribs. This high degree of design flexibility allows this technical solution to be applied to carbon canister products of different models and sizes, eliminating the need to redesign complex welding fixtures, significantly shortening the product development cycle, and reducing mold manufacturing costs.

[0073] The technical solution created by the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. This embodiment uses a gear shape as an example, but the tooth tip shape of the welded teeth described in the present invention is not limited to this. Those skilled in the art, based on the concept of the present invention, can replace the tooth tip with trapezoidal, rectangular, hemispherical, or other microstructures capable of point contact and energy focusing; these are all equivalent alternatives to the present invention and should be considered to fall within the protection scope of the present invention.

Claims

1. A biomimetic structural welded rib integrated into the shell of a carbon canister, characterized in that, The welding rib (2) is integrally formed on the surface of the welding area of ​​the carbon canister shell (1), and the welding rib (2) includes a plurality of protruding welding teeth (3) arranged at intervals along a preset welding path. Each of the welding teeth (3) has a tooth tip working surface (6) which is used to form a point contact with the non-woven fabric (4) covering it during ultrasonic welding and to focus and release energy in a local area under the action of ultrasonic energy, so that the non-woven fabric (4) in that area is fused with the carbon canister shell (1) to form an independent weld point. An inter-tooth groove (7) is provided between adjacent welding teeth (3), which forms an overflow accommodating space and a heat conduction buffer area.

2. The biomimetic structural welded rib integrated into the carbon canister shell according to claim 1, characterized in that, Multiple welding teeth (3) are arranged along the preset welding path to form a gear-shaped biomimetic structure.

3. The biomimetic structural welded rib integrated into the carbon canister shell according to claim 1, characterized in that, The preset welding path is circular, rectangular or irregular, and its shape and size match the edge outline of the nonwoven fabric (4) to be welded.

4. The biomimetic structural welded rib integrated into the carbon canister shell according to claim 1, characterized in that, The width of the tooth tip of the welding tooth (3) is L, and the width of the groove (7) between adjacent teeth is D. The ratio of L to D is 1:1.5 to 1:

3.

5. The biomimetic structural welded rib integrated into the carbon canister shell according to claim 1, characterized in that, The height H of the welding tooth (3) is 0.5mm-1.2mm, and H is greater than the amount of compression deformation of the nonwoven fabric (4) under welding pressure, so as to ensure that the bottom of the groove (7) between the teeth and the nonwoven fabric (4) remain in a non-contact state during the welding process.

6. A carbon canister shell, characterized in that, The welding area of ​​the carbon canister shell (1) is provided with biomimetic welding ribs (2) as described in any one of claims 1-5.

7. A method for welding nonwoven fabric to a carbon canister shell as described in claim 6, comprising the following steps: Step 1: Cover the non-woven fabric (4) to be welded over the welding area of ​​the carbon canister shell (1) so that the non-woven fabric (4) is in contact with or close to the tips of the welding teeth (3) of the welding rib (2); Step 2: Place the welding head of the ultrasonic welding equipment above the non-woven fabric (4); Step 3: Start the ultrasonic welding equipment. Under pressure, the welding head presses the non-woven fabric (4) against the welding rib (2) on the surface of the shell. The tip of each welding tooth (3) focuses the ultrasonic energy on the corresponding area, so that the non-woven fabric (4) and the shell are partially melted and bonded together to form multiple independent weld points with spacing. Step 4: During the welding process, the molten material flows into the interdental groove (7) of the welding rib (2) under pressure and is temporarily stored to avoid overflowing into the weld area; Step 5: After welding is completed, lift the welding head to obtain a carbon canister assembly with the non-woven fabric (4) and the carbon canister shell (1) fixed at multiple points.

8. The nonwoven fabric welding method for the carbon canister shell according to claim 7, characterized in that, The welding head is a flat welding head or a contour welding head that resembles the surface of the carbon canister shell (1).

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