Airbag device and folding method thereof

Abstract

The application provides an airbag device and a folding method thereof, and applies to the field of automobile passive safety technology. The airbag device comprises a shell, a gas generator and an airbag. The shell is arranged in an instrument panel. The gas generator is arranged in the shell and is used for inflating the airbag. The airbag is composed of two cavities. A main cavity is arranged on a passenger side, and a secondary cavity is arranged on a windshield side. The main cavity and the secondary cavity are connected in a head-to-tail mode and are in fluid communication. The secondary cavity extends towards the windshield side after being inflated and expanded. The main cavity extends towards the passenger side after being inflated and expanded. The secondary cavity faces at least a part of a passenger side panel. The height of the part is equal to or higher than the height of an obstacle beyond the instrument panel. During the inflation process of the airbag, the connecting part of the secondary cavity and the main cavity jumps over the obstacle and makes the main cavity unfold towards the passenger side. The device makes the main cavity connected to the secondary cavity smoothly jump over the top of the obstacle and unfold towards the passenger side, and solves the problem of the obstacle existing during the unfolding of the airbag in the automobile collision.

Description

Technical Field

[0001] This application relates to the field of automotive passive safety technology, specifically to an airbag device and its folding method. Background Technology

[0002] Airbags are a crucial component of a vehicle's passenger restraints system, providing additional protection and mitigating the risk of injury to occupants in the event of a collision. Larger center console screens in cars are becoming increasingly common. When deployed, airbags inflate rapidly to provide protection. If a large center console screen is active, the force of the airbag inflation may cause its surface to shatter or burst, releasing fragments or glass shards that could injure passengers. Simultaneously, an inflated airbag forms an airbag to prevent passengers from colliding with hard interior components or glass. If a large center console screen is located where an airbag is positioned and is not concealed or adjusted during inflation, it may obstruct the driver's or passengers' view, leading to driving difficulties or increasing the risk of a crash.

[0003] Currently, the development of passive safety products must consider both occupant protection and screen protection. Numerous existing technologies exist, including screen flipping or lifting mechanisms during a car collision, all aimed at preventing the airbag from shattering or knocking the screen away during deployment. Existing technology CN 113752977B discloses a method that uses a folding mechanism to deploy the airbag in stages, preventing the front of the airbag from directly impacting obstacles. However, because the airbag is a single unit, its deployment trajectory can only be guided by folding. This method risks shattering the windshield during deployment, and the airbag's bounce after deploying over a large screen is typically significant.

[0004] Therefore, a new technological solution is needed where the screen only needs to make flexible contact with the front and back, so as not to damage the screen or cause harm to the occupants. Furthermore, after the airbag deploys, the screen can also serve as a good rigid support for the flexible device - the airbag - during the occupant's impact. Summary of the Invention

[0005] In view of this, embodiments of this specification provide an airbag device and a folding method thereof.

[0006] This specification provides a first aspect of an airbag device, comprising: a housing disposed within an instrument panel; a gas generator and an airbag; the gas generator being disposed within the housing for inflating the airbag; characterized in that the airbag comprises two cavities, a main cavity disposed on the occupant side and a secondary cavity disposed on the windshield side, the main cavity and the secondary cavity being connected end-to-end and fluidly connected, and a vertically offset recess being formed at the connection between the main cavity and the secondary cavity, the recess accommodating a protrusion of the instrument panel.

[0007] Preferably, after the secondary cavity is inflated, it extends along the windshield and unfolds in a direction away from the windshield. After the main cavity is inflated, it extends toward the occupant side. At least a portion of the secondary cavity facing the occupant side panel has a height equal to or higher than the height of an obstacle beyond the dashboard. During the inflation of the airbag, the connection between the secondary cavity and the main cavity jumps over the obstacle and causes the main cavity to unfold toward the occupant side.

[0008] Preferably, the recess is supported by the instrument panel from the lower panel of the sub-cavity, and extends to the front panel of the sub-cavity at a position higher than or equal to the top of the obstacle, where it is fastened to the lower panel of the main cavity. This connection allows the recess to be positioned above the obstacle and to flexibly contact it, interlocking to form a stable support.

[0009] Preferably, the secondary cavity protrudes from the tear in the dashboard, extends vertically, and at least a portion of its vertical height is equal to or higher than the height of the obstacle exceeding the dashboard. It then extends along the windshield curvature from the end of the dashboard at the angle between the dashboard and the windshield to the back of the obstacle. The bottom panel of the secondary cavity is engaged with the dashboard.

[0010] Preferably, the secondary cavity includes a front panel and a rear panel, and the main cavity includes a front panel and a rear panel; the front panel of the secondary cavity is connected to the rear panel of the main cavity, and the rear panel of the secondary cavity is connected at the angle between the windshield and the instrument panel.

[0011] Preferably, the main cavity is located at the front end of the secondary cavity in the horizontal direction, the rear panel of the main cavity is connected to the front panel of the secondary cavity through a flow guide channel, and the front panel of the main cavity extends beyond the upper edge of the obstacle in the vertical direction.

[0012] Preferably, the front panel of the main cavity is in contact with the occupants, and the rear panel of the main cavity is connected to the front panel of the auxiliary cavity.

[0013] Preferably, the connection method between the contact surfaces of the main cavity rear panel and the secondary cavity front panel includes seam, silicone or felt connection;

[0014] Preferably, the volume of the secondary cavity is smaller than the volume of the main cavity.

[0015] Preferably, the main cavity and the secondary cavity are connected by an internal pull strap.

[0016] A second aspect of the present invention provides a method for folding an airbag, characterized in that it includes:

[0017] S1: Lay the air bag flat;

[0018] S2: Fold the two side wings of the air bag inward;

[0019] S3: The main cavity is folded horizontally to the connection point with the secondary cavity;

[0020] S4: The main cavity is folded into a Z-shape and pressed to the rear of the secondary cavity, and the front of the secondary cavity is rolled up and wrapped around the main cavity;

[0021] The airbag deployment process is as follows: In the first stage, the front part of the secondary cavity deploys to the vicinity or against the back of the obstacle; in the second stage, the rear part of the secondary cavity folds Z-shaped to quickly push the main cavity out of the deployment channel, and the connection between the main cavity and the secondary cavity jumps over the obstacle; in the third stage, the main cavity deploys facing the occupant side.

[0022] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:

[0023] 1. The airbag device consists of two chambers: a main chamber facing the occupant side and a secondary chamber located on the windshield side. The two chambers are connected end to end and are fluidly connected. The secondary chamber is located at the height of at least a portion of the panel facing the occupant side, equal to or higher than the height of an obstacle that extends beyond the dashboard. This obstacle can be a display screen, a steering wheel, or the like. This height ensures that the main chamber connected to the secondary chamber can smoothly pass over the top of the obstacle and deploy towards the occupant side, thus solving the problem of obstacles when the airbag deploys in a car collision.

[0024] 2. The design of the two cavities not only allows for smooth avoidance of obstacles and improves the stability of the bag, but also reduces bouncing after the bag is deployed. Furthermore, the two panels of the main and auxiliary cavities can stably clamp the obstacle, making it a rigid support in the flexible device. This helps to disperse the impact force and reduce the impact on the occupants. This design can reduce direct contact between the occupants and rigid components inside the vehicle, reducing the risk of injury.

[0025] 3. The volume of the secondary chamber is smaller than that of the main chamber, with a preferred volume ratio of 1:3. A smaller secondary chamber volume allows for faster inflation. When a collision sensor detects a vehicle collision, the airbag system needs to inflate rapidly to provide protection. Because the secondary chamber is smaller, less gas is required, allowing for faster inflation and deployment. Furthermore, a smaller secondary chamber volume means less space is occupied, and space is often a precious resource in vehicle interior design. Reducing the volume of the secondary chamber saves valuable interior space, which can be used for other devices or to provide more legroom for occupants. Finally, a smaller secondary chamber volume means a relatively smaller amount of gas and inflation pressure are required. This reduces the load on the vehicle from the airbag system, thus placing lower demands on the vehicle's structural design and strength. This helps mitigate the overall impact of the system on the vehicle, allowing for more flexible design.

[0026] 4. In a preferred embodiment, the main cavity and the secondary cavity are connected by a strap, allowing them to deploy collaboratively and ensuring the airbag deploys appropriately and provides optimal protection during a collision. When a collision occurs, gas from the secondary cavity inflates the airbag, and the strap connects the secondary cavity to the main cavity, allowing gas to fill the main cavity. This linkage mechanism ensures the overall deployment of the airbag, providing a larger coverage area and protection range. Simultaneously, the strap connection allows for balanced inflation of the main and secondary cavities, maintaining a uniform shape and inflation pressure during airbag deployment. This contributes to the stability and consistency of airbag deployment, preventing partial or uneven inflation and thus providing more reliable protection. The strap connection effectively utilizes the internal space of the airbag and reduces the space occupied by the entire airbag system, making the airbag system design more flexible. The strap connection increases the reliability of the airbag system, improves the system's response speed and stability, and ensures rapid and reliable airbag deployment during a collision. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments 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 these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the first embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the structure of the second embodiment of this application;

[0030] Figure 3 This is a structural schematic diagram of the third embodiment of this application;

[0031] Figure 4 This is a schematic diagram of the airbag being laid flat in an embodiment of this application;

[0032] Figure 5 This is a schematic diagram of the side wing inner plug in the embodiment of this application;

[0033] Figure 6 yes Figure 5 Cross-sectional view at point AA;

[0034] Figure 7 This is a schematic diagram of the air bag roll-up in an embodiment of this application;

[0035] Figure 8 yes Figure 7 Cross-sectional view at BB;

[0036] Figure 9 This is a schematic diagram of the air bag being rolled up and wrapped in an embodiment of this application;

[0037] Figure 10 yes Figure 9 Side view.

[0038] 10. Main cavity; 101. Main cavity rear panel; 102. Main cavity front panel; 20. Secondary cavity; 201. Secondary cavity rear panel; 202. Secondary cavity front panel; 30. Flow channel; 40. Main and secondary cavity connecting recess; 50. Partition central hole; 60. Pull strap; 70. Airbag side wing; 80. Airbag IP contact area; 90. Inflation port representing the airbag. Detailed Implementation

[0039] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0040] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application 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 this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0042] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0043] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0044] In a first aspect, the present invention provides an airbag device. Figure 1 The illustration shows a first embodiment of this application. The airbag device includes: a housing disposed within the dashboard; a gas generator and an airbag, the gas generator being disposed within the housing for inflating the airbag. The airbag comprises two chambers: a main chamber 10 disposed on the occupant side and a secondary chamber 20 disposed on the windshield side. The main chamber 10 and the secondary chamber 20 are connected end-to-end and connected by fluid. The secondary chamber 20 includes a rear panel 201 and a front panel 202, and the main chamber includes a rear panel 101 and a front panel 102. The rear panel 101 of the main chamber is connected to the front panel 202 of the secondary chamber via a flow channel 30. The contact surface connection methods include seams, silicone, or felt connections. However, it should be understood that the above connection methods are only preferred examples and should not be construed as limiting the scope of protection of the independent claims. The rear panel 201 of the secondary chamber is connected at an angle to the windshield and the dashboard, and the front panel 102 of the main chamber contacts the occupant.

[0045] Front and rear refer to two different directions. Generally, the front side is the side facing the occupant, and the rear side is the side facing away from the occupant. In the context of airbags, the front side and rear side refer to two different sides of the airbag. Generally, the front side is the side of the main body facing the occupant, and the rear side is the side opposite to the front side.

[0046] The main cavity 10 is located horizontally at the front end of the secondary cavity 20. After inflation, the secondary cavity 20 extends towards the windshield side, while the main cavity 10 extends towards the occupant side. At least a portion of the height of the secondary cavity 20 facing the occupant-side panel is equal to or higher than the height of an obstacle exceeding the dashboard, which can be a display screen or a steering wheel. During airbag inflation, the secondary cavity 20 expands from its uninflated position to its inflated position, inflating to a first pressure. Horizontally, it extends from the angle between the end of the dashboard and the windshield to the back of the obstacle on the occupant side. At least a portion of its vertical height is equal to or higher than the height of the obstacle exceeding the dashboard, and it fits against the contact area between the windshield and the dashboard. The secondary cavity 20 provides height h over the obstacle for the main cavity 10, allowing the connecting recess 40 between the secondary cavity 20 and the main cavity 10 to leap over the obstacle and for the main cavity 20 to expand towards the occupant side.

[0047] After the secondary cavity 20 is inflated to the first pressure, the main cavity 10 expands from the unexpanded position to the expanded position and is inflated to the second pressure. The main cavity 10 extends horizontally from the front of the obstacle to the occupant's position, covers the occupant's head protection area vertically, and extends vertically beyond the lower edge of the obstacle. A vertically offset recess 40 is formed at the connection between the main cavity 10 and the secondary cavity 20. The recess 40 is supported by the instrument panel of the lower panel of the secondary cavity and extends to the point where the front panel 202 of the secondary cavity is higher than or equal to the top of the obstacle, where it is fastened to the lower panel of the main cavity. This connection allows the recess 40 to be positioned above the obstacle and in flexible contact with it, interlocking to form a stable support.

[0048] In this embodiment, the volume of the secondary cavity 20 is smaller than that of the main cavity 10, preferably in a volume ratio of 1:3. However, it should be understood that the above volume ratio is only a preferred example and should not be construed as limiting the scope of protection of the independent claims. The smaller volume of the secondary cavity 20 helps achieve a faster inflation speed. When a collision sensor detects a vehicle collision, the airbag system needs to inflate rapidly to provide protection. Due to the smaller volume of the secondary cavity, less gas is required, allowing gas to be inflated into the airbag more quickly, enabling it to deploy as soon as possible. Furthermore, the smaller volume of the secondary cavity 20 means less space is occupied, and space is often a precious resource in vehicle interior design. By reducing the volume of the secondary cavity, valuable interior space can be saved, allowing it to be used for other devices or providing more legroom for occupants. Finally, the smaller volume of the secondary cavity 20 means that the required gas volume and inflation pressure are relatively lower. This reduces the load on the vehicle from the airbag system, thus placing relatively lower demands on the vehicle's structural design and strength. This helps to mitigate the overall impact of the system on the vehicle, allowing for more flexible design.

[0049] In this embodiment, the airbag displayed from inside the dashboard, through the secondary cavity 20 supporting the main cavity 10 across the obstacle at a height h, allows the main cavity 10 to smoothly cross over the obstacle and deploy facing the occupant, forming a stable airbag support structure. The main cavity 10 and the secondary cavity 20 can also stably clamp the obstacle, making it a rigid support within the flexible device, helping to disperse impact force and reduce the impact of occupant collisions. This design reduces direct contact between the occupant and rigid components inside the vehicle, reducing the risk of injury.

[0050] Figure 2The second embodiment of the present invention is shown. Compared with the first embodiment described above, the difference lies in that the main chamber 10 and the secondary chamber 20 are integrated airbags. The integrated airbag is separated into two chambers by a partition 50, and the rear panel 101 of the main chamber and the front panel 202 of the secondary chamber are connected by an opening 501 in the partition 50. The integrated airbag combines the main chamber 10 and the secondary chamber 20 into a single airbag unit, simplifying the design and manufacturing process. This reduces the number of components, simplifies the assembly process, and thus reduces production costs and complexity. In addition, integrated airbags typically occupy less space than separate airbags. This helps save space in the design of the vehicle interior, providing greater freedom for other devices or providing more space for occupants. Due to the simple structure and short inflation path of integrated airbags, faster inflation speed and deployment response time are usually achieved. This helps to provide protection as quickly as possible in the event of a collision, reducing the risk of injury to occupants.

[0051] Figure 3 The third embodiment of the present invention is shown. Compared with the first and second embodiments described above, the difference lies in that the main cavity 10 and the secondary cavity 20 are connected by an internal pull strap 60. First, the main cavity 10 and the secondary cavity 20, connected by the pull strap 60, can deploy collaboratively, ensuring that the airbag deploys appropriately during a collision and provides optimal protection. When a collision occurs, the gas in the secondary cavity 20 inflates the airbag, and then the pull strap connects the secondary cavity 20 to the main cavity 10, allowing the main cavity 10 to inflate as well. This linkage mechanism ensures the overall deployment of the airbag, providing a larger coverage area and protection range. Second, the pull strap 60 connection allows the main cavity 10 and the secondary cavity 20 to inflate evenly, maintaining a uniform shape and inflation pressure during airbag deployment. This helps achieve stability and consistency during airbag deployment, avoiding partial or uneven inflation, thus providing more reliable protection. Third, the pull strap 60 connection effectively utilizes the internal space of the airbag and reduces the space occupied by the entire airbag system, making the design of the airbag system more flexible. Fourth, the strap connection can increase the reliability of the airbag system, improve the system's response speed and stability, and ensure that the airbag can be deployed quickly and reliably in the event of a collision.

[0052] In a second aspect, the present invention provides a method for folding an airbag. Figures 4-10 A schematic diagram of an airbag folding method in an optional embodiment of the present invention is shown.

[0053] S1: Lay the entire air bag flat. Figure 4 The diagram shows the front side view of the airbag according to an embodiment of the present invention. In the diagram: 70 represents the two side wings of the airbag; 90 represents the airbag inflation port; 80 represents the IP (Instrument Panel) contact area of ​​the airbag, which is the part that contacts the IP and supports the shape of the entire airbag when the airbag is deployed.

[0054] S2: The two side wings of the airbag fold inward at a 70° angle, as... Figure 5 As shown, Figure 6 for Figure 5 A schematic diagram along the AA direction.

[0055] S3: Fold the main cavity 10 along the horizontal X direction to the connection point with the secondary cavity 20. Figure 8 for Figure 7 A diagram along the BB direction, from Figure 8 It can be seen that, from Figure 5 The state shown is obtained Figure 7 The folding method shown is as follows: along the bottom edge of the main cavity 10, only the main cavity is folded up to the connection point with the two secondary cavities 0.

[0056] S4: The main cavity 10 is folded into a Z-shape to the rear of the secondary cavity 20, and the front of the secondary cavity 20 is rolled up and wrapped around the main cavity 10. The number of times they are folded can be selectively set according to the actual situation. For example, when the size of the airbag shell that contains the airbag is large, the number of folds can be less, and the number of flips and folds can be more. Figure 10 for Figure 9 Side view, from Figure 10 It can be seen that, from Figure 7 The state shown is obtained Figure 9 The folding method shown is as follows: the front part of the secondary cavity 20 is rolled up and wrapped around the main cavity 10.

[0057] The airbag deployment process is as follows: In the first stage, the front part of the secondary cavity deploys to the vicinity or against the back of the obstacle; in the second stage, the rear part of the secondary cavity folds in a Z-shape to quickly push the main cavity out of the deployment channel, and the connection between the main cavity and the secondary cavity jumps over the obstacle; in the third stage, the main cavity deploys facing the occupant side.

[0058] In the event of a collision, the secondary cavity is inflated first to fill the gap between the windshield, dashboard, and obstacle through a special folding mechanism. Then, the folded package of the main cavity is pushed out of the deployment channel, that is, it leaps over the top of the obstacle to the front of the obstacle. This allows the main cavity to be unobstructed by the obstacle on the side of the dashboard facing the occupants and can be quickly and smoothly deployed into place. This structure is very stable and plays a good protective role in increasingly severe frontal collisions.

[0059] This invention provides an airbag that can be used on the passenger side. When the driver's side steering wheel is rotated / avoided, and the dashboard design is similar to the passenger side, the airbag is also applicable to the driver's side. However, it should be understood that the above-described airbag installation position is merely a preferred example and should not be construed as limiting the scope of protection of the independent claims.

[0060] In this specification, the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the descriptions of the embodiments described later are relatively simple, and relevant parts can be referred to the descriptions of the foregoing embodiments.

[0061] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An airbag device, comprising: Housing, the housing being disposed within the instrument panel; A gas generator and an air bag; the gas generator is disposed inside the housing and is used to inflate the air bag; The airbag is characterized in that it consists of two cavities, namely a main cavity and a secondary cavity. The main cavity is located on the passenger side, and the secondary cavity is located on the windshield side. The main cavity and the secondary cavity are connected end to end and are in fluid communication. A recessed portion with vertical misalignment is formed at the connection between the main cavity and the secondary cavity. The recessed portion accommodates obstacles of the instrument panel. When the secondary cavity is expanded to the inflated position, it is at least partially in contact with the instrument panel. After the secondary chamber is inflated, it extends along the windshield and unfolds in a direction away from the windshield. After the main chamber is inflated, it extends toward the occupant side. At least a portion of the secondary chamber facing the occupant side panel has a height equal to or higher than the height of an obstacle beyond the dashboard. During the inflation of the airbag, the connection between the secondary chamber and the main chamber jumps over the obstacle and causes the main chamber to unfold toward the occupant side. After the airbag is deployed, the main cavity contacts the side of the obstacle closest to the occupant, the secondary cavity contacts the side of the obstacle furthest from the occupant, and the recess interlocks with the obstacle to form a stable support, making the obstacle a rigid support in the flexible device.

2. The airbag device according to claim 1, characterized in that, The recess is supported by the instrument panel from the lower panel of the sub-cavity, and extends to the front panel of the sub-cavity at a position higher than or equal to the top of the obstacle, where it is fastened to the lower panel of the main cavity. This connection allows the recess to be positioned above the obstacle and to flexibly contact it, interlocking to form a stable support.

3. The airbag device according to claim 1, characterized in that, The secondary cavity protrudes from the tear in the dashboard, extends vertically, and at least part of its vertical height is equal to or higher than the height of the obstacle beyond the dashboard. It then extends along the windshield curvature from the end of the dashboard at the angle between the dashboard and the windshield to the back of the obstacle. The bottom panel of the secondary cavity is attached to the dashboard.

4. The airbag device according to claim 1, characterized in that, The secondary cavity includes a front panel and a rear panel, and the main cavity includes a front panel and a rear panel; the front panel of the secondary cavity is connected to the rear panel of the main cavity, and the rear panel of the secondary cavity is connected at the angle between the windshield and the dashboard.

5. The airbag device according to claim 4, characterized in that, The main cavity is located at the front end of the secondary cavity in the horizontal direction. The rear panel of the main cavity is connected to the front panel of the secondary cavity through a flow channel. The front panel of the main cavity extends beyond the upper edge of the obstacle in the vertical direction.

6. The airbag device according to claim 5, characterized in that, The front panel of the main cavity is in contact with the occupants, and the rear panel of the main cavity is connected to the front panel of the auxiliary cavity.

7. The airbag device according to claim 6, characterized in that, The connection method between the contact surfaces of the main cavity rear panel and the secondary cavity front panel includes seam, silicone, or felt connection.

8. The airbag device according to any one of claims 1 to 7, characterized in that, The volume of the secondary cavity is smaller than the volume of the main cavity.

9. The airbag device according to claim 1, characterized in that, The main cavity and the secondary cavity are connected by an internal strap.

10. A method for folding an airbag device as described in any one of claims 1 to 9, characterized in that, include: S1: Lay the air bag flat; S2: Fold the two side wings of the air bag inward; S3: The main cavity is folded horizontally to the connection point with the secondary cavity; S4: The main cavity is folded into a Z-shape and pressed to the rear of the secondary cavity, and the front of the secondary cavity is rolled up and wrapped around the main cavity; The airbag deployment process is as follows: In the first stage, the front part of the secondary cavity is preferentially deployed to the vicinity or to the back of the obstacle; In the second stage, the rear part of the secondary cavity folds in a Z-shape to quickly push the main cavity out of the unfolding channel, and the connection between the main cavity and the secondary cavity leaps over the obstacle. In the third stage, the main cavity unfolds towards the occupant side.

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