Collision protection device and vehicle

Abstract

This utility model provides a collision protection device and a vehicle. The collision protection device includes: a front subframe, comprising a first crossbeam and a second crossbeam spaced apart along its length and extending along its width, the first crossbeam being located at the bottom of the front subframe and below the bottom surface of the power battery; a triggering component fixed to the bottom front side of the battery housing; a bottom guard plate, one end rotatably connected to the bottom of the first crossbeam, and the other end fixedly connected to the triggering component, closely attached to and fixed to the bottom front side of the battery housing; and a curtain airbag folded and fixed inside the second crossbeam. When the first crossbeam is impacted, the triggering component is activated, and the other end of the bottom guard plate moves away from the bottom of the power battery and is fixedly connected to the triggering component; the curtain airbag is detonated, extending out from the second crossbeam, unfolding towards the bottom guard plate and the power battery, and covering the bottom front side of the power battery. This reduces the intrusion of obstacles into the power battery and the collision energy generated by obstacles on the power battery during secondary impacts.

Description

Technical Field

[0001] This utility model belongs to the field of electric vehicle technology, and specifically relates to a collision protection device and a car equipped with the collision protection device. Background Technology

[0002] In today's world where vehicles are widely used, vehicle safety performance is of paramount importance to consumers. To improve safety, active and passive safety systems are extensively incorporated into the design of various vehicles. With the increasing popularity of new energy vehicles, different power systems also present new challenges to vehicle safety. To ensure driving range, new energy vehicles are equipped with massive battery systems, significantly increasing the overall vehicle weight. Greater weight means that at the same speed during a collision, greater momentum and energy will be generated.

[0003] New energy vehicles have limited and relatively weak bottom buffer space, making them susceptible to deformation and damage to the power battery in bottom collisions. This can lead to battery rupture, electrolyte leakage, and potentially vehicle electrical leakage and fire. Therefore, bottom protection of the battery pack in new energy vehicles is crucial, directly impacting battery safety, vehicle lifespan, and user safety. To address this, the China Insurance Automotive Safety Index (C-IASI) has added a bottom collision test for new energy vehicles. This test simulates a bottom scrape scenario during vehicle operation, using a scraping tool to test the entire bottom of the vehicle and assess its bottom impact resistance. Currently, after a collision with an obstacle, existing vehicles often bounce a short distance before falling back down due to gravity, causing the power battery to collide with the obstacle again, resulting in secondary damage. Utility Model Content

[0004] The purpose of this invention is to solve the problem in the prior art that when a vehicle collides with an obstacle, it bounces up a distance and falls back down due to gravity, causing the power battery to collide with the obstacle again and resulting in secondary damage.

[0005] To solve the above-mentioned technical problems, this utility model discloses a collision protection device for protecting a vehicle's power battery. The power battery is fixed to the bottom of the vehicle body via a battery frame. The collision protection device includes a front subframe, which is fixed to the bottom of the vehicle body. In the length direction of the vehicle, the front subframe is located in front of the power battery. The front subframe includes a first crossbeam and a second crossbeam spaced apart in its length direction and extending along its width direction. The first crossbeam is located at the bottom of the front subframe. In the height direction of the vehicle, the bottom surface of the first crossbeam is located below the bottom surface of the power battery. Along the length of the vehicle, the first crossbeam is further away from the power battery than the second crossbeam; the triggering component is fixed to the bottom front side of the battery frame and located on the outside of the power battery, and can be triggered; the bottom guard plate is located at the bottom of the first crossbeam, with one end rotatably connected to the bottom of the first crossbeam and the other end fixedly connected to the triggering component, close to and fixed to the bottom front side of the battery frame, and near the bottom of the power battery; the air curtain is folded and fixed inside the second crossbeam, and can extend out of the second crossbeam after being ignited.

[0006] When the first crossbeam is impacted, the triggering component is activated. Based on the other end of the underbody protection plate being fixedly connected to the triggering component, the other end of the underbody protection plate is moved away from the bottom of the battery frame and the bottom of the power battery. One end of the underbody protection plate rotates relative to the first crossbeam, and a receiving space is formed between the front subframe, the bottom of the power battery, and the underbody protection plate. The air curtain is detonated, extending out of the second crossbeam, and unfolds within the receiving space in the direction closer to the underbody protection plate and closer to the power battery, covering the bottom front side of the power battery.

[0007] Using the above technical solution, the collision protection device includes a front subframe, a triggering component, a bottom guard plate, and a curtain airbag. The front subframe includes a first crossbeam and a second crossbeam. The bottom surface of the first crossbeam is located below the bottom surface of the power battery. The curtain airbag is folded and fixed inside the second crossbeam. The bottom guard plate is located at the bottom of the first crossbeam, with one end rotatably connected to the bottom of the first crossbeam and the other end fixedly connected to the triggering component, closely attached to and fixed to the bottom front side of the battery frame, and close to the bottom of the power battery. When the first crossbeam is hit by an obstacle, the triggering component is triggered, causing the other end of the bottom guard plate to move away from the bottom of the battery frame and the bottom of the power battery. One end of the bottom guard plate rotates relative to the first crossbeam, causing the other end of the bottom guard plate to open at a certain angle relative to the front subframe towards the ground. When the bottom guard plate is hit by an obstacle, it can absorb some of the energy generated by the collision, and a receiving space is formed between the front subframe, the bottom of the power battery, and the bottom guard plate. The curtain airbag is detonated, extending out of the second crossbeam, and unfolds within the receiving space towards the bottom guard plate and towards the power battery, covering the bottom front side of the power battery. In the initial stage of airbag deployment, because the gas generation speed inside the airbag is much greater than the gas expelled from the vents, the airbag can be considered a highly rigid body. It maintains the height difference between the underbody protection and the bottom of the battery, preventing obstacles from intruding into the created space. This lifts the car, reducing the Z-axis overlap between the obstacle and the battery, directly minimizing the obstacle's intrusion into the battery. Later, as the airbag fully deploys, its overall rigidity decreases. As the car moves forward, obstacles glide across the underbody protection and directly contact the airbag, absorbing the energy converted from velocity. This further reduces the impact on the battery. Simultaneously, the car body descends slowly, ensuring that the airbag contacts the obstacle first upon descent, reducing the collision energy of a secondary impact on the battery, improving the car's bottom impact resistance, protecting the battery, and enhancing the safety of occupants in new energy vehicles.

[0008] According to another specific embodiment of the present invention, the collision protection device disclosed in this embodiment further includes a collision sensor and a controller. The collision sensor is fixed on the first crossbeam, and the controller is communicatively connected to the collision sensor, the triggering component, and the air curtain. The collision sensor is used to acquire a collision signal and send it to the controller. The controller controls the triggering component to be triggered and the air curtain to be detonated according to the received collision signal.

[0009] With the above technical solution, the first crossbeam is located at the bottom of the front subframe, and its bottom surface is below the bottom surface of the power battery. This ensures that before an obstacle scrapes against the power battery, it will inevitably collide with the first crossbeam first. The collision sensor is fixed to the first crossbeam and can obtain the collision signal through the collision sensor. This allows for the subsequent control of the triggering components and the detonation of the air curtain based on the collision signal, thereby protecting the power battery in advance.

[0010] According to another specific embodiment of the present invention, the embodiment discloses a collision protection device, wherein the collision sensor is a strain gauge pressure sensor.

[0011] Using the above technical solution, the obstacle will generate strain after colliding with the first crossbeam. The collision sensor fixed on the first crossbeam is a strain pressure sensor that can generate a collision signal based on the strain, which can realize early warning of power battery collision.

[0012] According to another specific embodiment of the present invention, the collision protection device disclosed in this embodiment of the present invention has a plurality of first connecting holes spaced apart along its width direction on the bottom front side of the battery frame. A triggering component is fixed to the bottom of the first connecting hole near the outer side of the plurality of first connecting holes, and is located on both sides of the power battery in the width direction of the vehicle. The other end of the bottom guard plate has a plurality of second connecting holes spaced apart along its width direction, corresponding to the plurality of first connecting holes. A first bolt passes through the second connecting hole near the outer side of the plurality of second connecting holes and is fixedly connected to the triggering component, so that the other end of the bottom guard plate is tightly attached to and fixed to the bottom front side of the battery frame, and close to the bottom of the power battery. After the triggering component is triggered, it pushes the first bolt to move away from the bottom of the power battery, and keeps the other end of the bottom guard plate fixedly connected to the triggering component through the first bolt, thereby moving the other end of the bottom guard plate away from the bottom of the battery frame and the bottom of the power battery.

[0013] With the above technical solution, the triggering components are located on both sides of the power battery. This ensures that after the triggering components are triggered, although the other end of the bottom guard plate can be fixedly connected to the bottom front side of the battery frame through the first bolt and the triggering components, the first bolt is located on both sides of the power battery, so that the air curtain after ignition can cover the bottom front side of the power battery.

[0014] According to another specific embodiment of the present invention, the collision protection device disclosed in this embodiment uses a second bolt to pass through the second connecting hole located in the middle of a plurality of second connecting holes and the first connecting hole located in the middle of a plurality of first connecting holes, so that the other end of the bottom guard plate is fixedly connected to the bottom front side of the battery frame; a weakening tear line is provided around the second connecting hole located in the middle; when the triggering component is triggered, the weakening tear line is torn by force during the movement of the first bolt, so that the other end of the bottom guard plate is away from the bottom of the battery frame and the bottom of the power battery.

[0015] With the above technical solution, after the triggering component is triggered, the weakened tear line on the periphery of the second connecting hole in the middle is torn by force. The other end of the bottom guard plate is away from the bottom of the battery frame and the bottom of the power battery. The outer side of the other end of the bottom guard plate can still be fixedly connected to the bottom of the battery frame by the first bolt and the triggering component. There is no connection between the middle and the bottom of the battery frame, which makes it easy for the air curtain to be deployed towards the power battery after it is ignited.

[0016] According to another specific embodiment of the present invention, the collision protection device disclosed in this embodiment of the present invention uses a pyrotechnic generator as the triggering component.

[0017] According to another specific embodiment of the present invention, the collision protection device disclosed in the embodiment of the present invention has a weakening groove extending along its length on the side of the second crossbeam near the bottom guard plate, and the weakening groove is H-shaped.

[0018] Using the above technical solution, a weakening groove extending along its length is provided on the side of the second crossbeam near the bottom guard plate, making the weakening groove easy to crack under force. In this way, after the air curtain is ignited, the weakening groove cracks under the impact force, and the air curtain can extend out of the second crossbeam from the weakening groove, thereby achieving the coverage of the bottom front side of the power battery.

[0019] According to another specific embodiment of the present invention, the collision protection device disclosed in this embodiment uses polypropylene material filled with glass fiber on the side of the second crossbeam near the bottom guard plate.

[0020] Using the above technical solution, the glass fiber-filled polypropylene material is prone to brittle fracture. This material is used on the side of the second crossbeam near the bottom guard plate. When the air curtain is ignited, the side of the second crossbeam near the bottom guard plate is easily torn by the impact force, which facilitates the air curtain to extend out of the second crossbeam.

[0021] According to another specific embodiment of the present invention, the collision protection device disclosed in this embodiment has an L-shaped inflation state of the air curtain, which is adapted to accommodate the front subframe, the bottom of the power battery and the bottom guard plate after the triggering component is triggered.

[0022] Using the above technical solution, the air curtain is inflated in an L-shape, so that after the air curtain is ignited, it can unfold in the direction of approaching the bottom guard plate and the direction of approaching the power battery, thereby protecting the power battery.

[0023] This utility model also discloses an automobile, including: the above-mentioned collision protection device, power battery and front skid plate; wherein, in the length direction of the automobile, the front subframe of the collision protection device is located in front of the power battery; the front skid plate is located at the bottom of the front subframe, and in the length direction of the automobile, it is located in front of the bottom skid plate and fixedly connected to the first crossbeam of the front subframe, and one end of the bottom skid plate is rotatably connected to the front skid plate, so that one end of the bottom skid plate is rotatably connected to the bottom of the first crossbeam.

[0024] By adopting the above technical solution, one end of the bottom guard plate is rotatably connected to the front guard plate to ensure the integrity of the entire bottom guard plate of the car. In addition, the collision protection device reduces the intrusion of the power battery in the scrape test, improves the collision resistance of the bottom of the car, thereby protecting the power battery, improving the safety of occupants of new energy vehicles, and avoiding the occurrence of failure in the scrape test of the China Insurance Automotive Safety Index.

[0025] The beneficial effects of this utility model are as follows:

[0026] This utility model provides a collision protection device and a car. The collision protection device includes a front subframe, a triggering component, a bottom guard plate, and a curtain airbag. The front subframe includes a first crossbeam and a second crossbeam. The bottom surface of the first crossbeam is located below the bottom surface of the power battery. The curtain airbag is folded and fixed inside the second crossbeam. The bottom guard plate is located at the bottom of the first crossbeam, with one end rotatably connected to the bottom of the first crossbeam and the other end fixedly connected to the triggering component, closely attached to and fixed to the bottom front side of the battery frame, and close to the bottom of the power battery. When the first crossbeam is struck by an obstacle, the triggering component is activated, causing the other end of the underbody protection plate to move away from the bottom of the battery housing and the bottom of the power battery. One end of the underbody protection plate rotates relative to the first crossbeam, causing the other end of the underbody protection plate to open at a certain angle relative to the front subframe towards the ground. When the underbody protection plate is struck by an obstacle, it can absorb some of the energy generated by the impact. Furthermore, a space is formed between the front subframe, the bottom of the power battery, and the underbody protection plate. The air curtain is then detonated, extending out from the second crossbeam and unfolding within the space towards the underbody protection plate and towards the power battery, covering the bottom front side of the power battery. In the initial stage of air curtain detonation, because the gas generation speed inside the air curtain is much greater than the gas expelled from the air curtain's vents, the air curtain can be considered a highly rigid body at this time. It maintains the height difference created by the underbody protection plate and the bottom of the power battery, preventing obstacles from intruding into the created space. This lifts the car, reduces the Z-axis overlap between the obstacle and the power battery, and directly reduces the obstacle's intrusion into the power battery. After the air curtain is fully deployed, the overall rigidity begins to decrease. As the car moves forward, the obstacle slides across the underbody protection plate and comes into direct contact with the obstacle, absorbing the energy converted from the speed. This further reduces the impact of the obstacle on the power battery. At the same time, the car body descends slowly, ensuring that the air curtain contacts the obstacle first when falling. This reduces the collision energy generated by the obstacle on the power battery during a secondary impact, improves the collision resistance of the car's bottom, and thus protects the power battery and improves the safety of the occupants of new energy vehicles. Attached Figure Description

[0027] Figure 1 A schematic diagram of the collision protection device provided in this embodiment of the utility model (excluding the triggering component and the air curtain is not shown);

[0028] Figure 2 A right-side view of the collision protection device installed at the rear of the vehicle body according to an embodiment of the present utility model (the triggering component is not triggered and the curtain airbag is not detonated);

[0029] Figure 3 A top-down view of the collision protection device installed behind the vehicle body according to an embodiment of the present utility model (the triggering component is not triggered and the curtain airbag is not detonated);

[0030] Figure 4 for Figure 2A partially enlarged schematic diagram of the triggering component and the first bolt at position B (the triggering component is not triggered);

[0031] Figure 5 A right-side view of the collision protection device installed at the rear of the vehicle body (the triggering component is triggered and the curtain airbag is detonated) provided in this embodiment of the utility model.

[0032] Figure 6 A top-down view of the collision protection device installed behind the vehicle body (the triggering component is triggered and the air curtain is detonated) provided in this embodiment of the utility model.

[0033] Figure 7 for Figure 5 A partially enlarged schematic diagram of the triggering component and the first bolt at position C (the triggering component is triggered); Figure 8 for Figure 3 A magnified view of a portion of position A in the diagram;

[0034] Figure 9 A structural block diagram of the controller, collision sensor, triggering component, and air curtain of the collision protection device provided in this embodiment of the utility model;

[0035] Figure 10 A schematic diagram of the structure of the second crossbeam of the collision protection device provided in this embodiment of the utility model.

[0036] Explanation of reference numerals in the attached figures:

[0037] 10. Collision protection device; 100. Front subframe; 110. First crossbeam; 120. Second crossbeam; 121. Weakening groove; 200. Triggering component; 300. Underbody protection plate; 310. Second connecting hole; 320. Weakening tear line; 400. Air curtain; 500. First bolt; 600. Second bolt; 700. Collision sensor; 800. Controller; 20. Power battery; 30. Body; 40. Front guard plate; 50. Battery frame. Detailed Implementation

[0038] Because the bottom buffer space of new energy vehicles is small and relatively weak, bottom collisions can easily cause deformation and damage to the power battery, leading to battery rupture, electrolyte leakage, and potentially vehicle leakage and fire. Therefore, bottom protection of the battery pack in new energy vehicles is crucial, directly affecting battery safety, vehicle lifespan, and user safety. In response to this, the China Insurance Automotive Safety Index (C-IASI) has added a bottom collision test for new energy vehicles. This test simulates a bottom scraping scenario during vehicle operation, using a scraping tool to test the entire bottom of the vehicle and assess its bottom impact resistance. Currently, after a collision with an obstacle, existing vehicles often bounce a distance and then fall back down due to gravity, causing the power battery to collide with the obstacle again, resulting in secondary damage.

[0039] To address the aforementioned problems, this utility model provides a collision protection device and a vehicle. The collision protection device includes a first crossbeam, a second crossbeam with an air curtain fixed inside, and a bottom guard plate. One end of the bottom guard plate is rotatably connected to the bottom of the first crossbeam, and the other end of the bottom guard plate is fixed to the bottom front side of the battery frame used to fix the power battery via a triggering component, and is close to the power battery. When an obstacle collides with the first crossbeam, the triggering component is activated, and one end of the bottom guard plate rotates relative to the first crossbeam. This causes the other end of the bottom guard plate to move away from the bottom of the battery frame and the bottom of the power battery while maintaining a fixed connection to the bottom of the battery frame, thus opening the bottom guard plate at a certain angle. The air curtain is then detonated. The air curtain first unfolds downwards along the Z-axis (the height direction of the vehicle), filling the space between the bottom guard plate and the subframe, and then unfolds towards the rear of the vehicle along the X-axis (the length direction of the vehicle), passing through the space after the bottom guard plate has opened, and thus covering the entire bottom front side of the power battery. Furthermore, in the initial stage of curtain air ignition, the curtain air has high rigidity, lifting the car and directly reducing the intrusion of obstacles into the power battery. After the curtain air is fully deployed, the rigidity decreases, and the obstacle slides across the underbody protection plate, which absorbs some of the energy generated by the collision. At the same time, it causes the car body to slowly descend, and the curtain air separates the obstacle from the power battery. The curtain air contacts the obstacle first, reducing the collision energy generated by the obstacle on the power battery during a secondary impact.

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0041] Example 1

[0042] like Figures 1-9 As shown, this utility model provides a collision protection device 10 for protecting the power battery 20 of a vehicle. The power battery 20 is fixed to the bottom of the vehicle body 30 via a battery frame 50. It should be noted that in this embodiment, the battery frame 50 is fixed to the bottom of the vehicle body 30, and the power battery 20 is fixed to the battery frame 50, which is located on the outer periphery of the power battery 20. In the height direction of the vehicle (Z direction in the figure), the bottom of the battery frame 50 can be at the same height as the bottom of the battery frame 50, or it can be located above the bottom of the battery frame 50; this embodiment does not impose specific limitations on this.

[0043] like Figures 1-9 As shown, the collision protection device 10 includes: a front subframe 100, a triggering component 200, a floor guard 300, and a curtain airbag 400.

[0044] like Figures 1-3As shown, the front subframe 100 is used to fix the bottom of the vehicle body 30. In the length direction of the vehicle (X direction in the figure), the front subframe 100 is located in front of the power battery 20. The front subframe 100 includes a first crossbeam 110 and a second crossbeam 120 that are spaced apart in its length direction (X direction in the figure) and extend along its width direction (Y direction in the figure). The first crossbeam 110 is located at the bottom of the front subframe 100. In the height direction of the vehicle (Z direction in the figure), the bottom surface of the first crossbeam 110 is located below the bottom surface of the power battery 20. In the length direction of the vehicle, the first crossbeam 110 is further away from the power battery 20 than the second crossbeam 120.

[0045] It should be noted that the length direction of the front subframe 100 is parallel to the length direction of the vehicle (X direction in the figure), and the width direction of the front subframe 100 is parallel to the width direction of the vehicle (Y direction in the figure). The front subframe 100 is located in front of the power battery 20, and the first crossbeam 110 is located at the bottom of the front subframe 100, with the bottom surface of the first crossbeam 110 below the bottom surface of the power battery 20. Therefore, the first crossbeam 110 is located in front of the power battery 20 and at the lowest position of the vehicle's bottom to ensure that when an obstacle collides with the vehicle, the obstacle collides with the first crossbeam 110 first. In this embodiment, the fixing connection method includes, but is not limited to, threaded connection, welding, and riveting.

[0046] Along the length of the vehicle, the triggering component 200 is fixed to the bottom front side of the battery frame 50 and located outside the power battery 20, and can be triggered. It should be noted that in this embodiment, the triggering component 200 can be a gas generator that generates high-temperature gas and thus produces an impact force when triggered, or it can be a component with a compressed spring inside that releases its compression elasticity and generates an impact force when triggered, or it can be any other component that generates an impact force when triggered, as long as the generated impact force ensures that the other end of the bottom guard plate 300 is away from the bottom of the battery frame 50 and the bottom of the power battery 20, but still allows connection to the battery frame 50 through the triggering component 200. The triggering component 200 being located outside the power battery 20 can prevent obstruction of the path of the air curtain 400 as it unfolds towards the power battery 20 after being triggered. In one embodiment of this utility model, the triggering component 200 is a pyrotechnic generator.

[0047] like Figure 2 and Figure 3 As shown, the bottom guard plate 300 is located at the bottom of the first crossbeam 110. In the length direction of the vehicle, one end of the bottom guard plate 300 is rotatably connected to the bottom of the first crossbeam 110, and the other end is fixedly connected to the trigger component 200, close to and fixed to the bottom front side of the battery frame 50, and near the bottom of the power battery 20.

[0048] It should be noted that one end of the bottom guard plate 300 can be rotatably connected to the bottom of the first crossbeam 110 through a hinge or other rotating structure, and the other end of the bottom guard plate 300 is tightly attached to and fixed to the bottom front side of the battery frame 50 through the trigger component 200, and is close to the bottom of the power battery 20.

[0049] The air curtain 400 is folded and fixed inside the second crossbeam 120, and can extend out of the second crossbeam 120 after being detonated.

[0050] It should be noted that in this embodiment, the interior of the second crossbeam 120 is hollow, providing a space for storing the folded air curtain 400. The air curtain 400 is fixed to the interior of the second crossbeam 120 by means including, but not limited to, snap-fit ​​and adhesive. After being detonated, the air curtain 400 remains fixedly connected to the second crossbeam 120. In this embodiment, the air curtain 400 refers to a structure that can be folded and stored when not detonated, and which generates gas inside after detonation to form an inflatable gas with a certain rigidity. To facilitate the extension of the air curtain 400 out of the second crossbeam 120 after detonation, the second crossbeam 120 needs to be made of a material that facilitates brittle fracture and / or have a structure that facilitates cracking (e.g., a weakening groove). The specific location only needs to facilitate the air curtain 400 to unfold towards the bottom protective plate 300 and towards the power battery 20 after detonation; this embodiment does not impose specific limitations.

[0051] Specifically, such as Figures 5-7 As shown, when the first crossbeam 110 is impacted, the triggering component 200 is activated at the other end of the bottom guard plate 300. Figure 5 The right end of the bottom guard plate 300 is fixedly connected to the trigger component 200, which drives the other end of the bottom guard plate 300 away from the bottom of the battery frame 50 and the bottom of the power battery 20, that is, the other end of the bottom guard plate 300 rotates downward, and one end of the bottom guard plate 300 ( Figure 5 The left end of the first crossbeam 110 rotates relative to the first crossbeam 110, forming a receiving space between the front subframe 100, the bottom of the power battery 20 and the bottom guard plate 300; the air curtain 400 is detonated, extends out of the second crossbeam 120, and unfolds in the receiving space towards the direction closer to the bottom guard plate 300 and towards the direction closer to the power battery 20, and covers the bottom front side of the power battery 20.

[0052] In the initial stage of curtain air 400 deployment, because the gas generation speed inside curtain air 400 is much greater than the gas expelled from the vent holes of curtain air 400, curtain air 400 can be considered a highly rigid body at this time. It maintains the containment space created by the underbody protection plate 300, the front subframe 100, and the bottom of the power battery 20. Obstacles cannot intrude into this created space, thus lifting the car and reducing the Z-axis overlap between the obstacle and the power battery 20, directly reducing the intrusion of the obstacle into the power battery 20. After curtain air 400 is fully deployed, its overall rigidity begins to decrease. As the car moves forward, obstacles pass over the underbody protection plate 300 and directly contact the obstacle, absorbing the energy converted from velocity, further reducing the impact of the obstacle on the power battery 20. Simultaneously, the car body 30 descends slowly, ensuring that curtain air 400 contacts the obstacle first during descent, reducing the collision energy generated by the obstacle on the power battery 20 during a secondary impact, improving the collision resistance of the car's bottom, thus protecting the power battery 20 and improving the safety of the occupants of new energy vehicles.

[0053] In one embodiment of this utility model, a plurality of first connection holes are spaced apart along the width direction on the bottom front side of the battery frame 50. A triggering component 200 is fixed to the bottom of the first connection hole closest to the outer side among the plurality of first connection holes, and is located on both outer sides of the power battery 20 in the width direction of the vehicle. Figure 1 As shown, the other end of the bottom protective plate 300 is provided with a plurality of second connecting holes 310 at intervals along its width direction, corresponding to a plurality of first connecting holes (not shown in the figure); as Figures 1-4 As shown, the first bolt 500 passes through the outermost of the multiple second connecting holes 310 and is fixedly connected to the trigger component 200, so that the other end of the bottom guard plate 300 is tightly attached to and fixed to the bottom front side of the battery frame 50, and close to the bottom of the power battery 20; as Figures 5-7 As shown, after the triggering component 200 is triggered, it pushes the first bolt 500 to move away from the bottom of the power battery 20, that is, to move downwards, while keeping the other end of the bottom guard plate 300 fixedly connected to the triggering component 200 through the first bolt 500, thereby driving the other end of the bottom guard plate 300 away from the bottom of the battery frame 50 and the bottom of the power battery 20.

[0054] Since the triggering components 200 are located on both sides of the outside of the power battery 20, this ensures that after the triggering components 200 are triggered, the other end of the bottom protective plate 300 can still be fixedly connected to the bottom front side of the battery frame 50 via the first bolt 500 and the triggering components 200. Furthermore, the first bolt 500, after being pushed, remains located on both sides of the outside of the power battery 20, ensuring that the deployment path of the air curtain 400 after ignition is not affected by the first bolt 500, thus achieving coverage of the bottom front side of the power battery 20. Additionally, it should be noted that if the air curtain 400 is set long enough, such as... Figure 3 and Figure 6 As shown, after ignition, it can also be encased in the power battery 20 ( Figure 6 The entire bottom (not shown in the image).

[0055] It should be noted that the width direction of the battery frame 50 and the width direction of the bottom guard plate 300 are parallel to the width direction of the vehicle (Y direction in the figure). The specific number of the first connecting holes can be three, four, or even more, as long as they can be fixedly connected to the bottom guard plate 300. This embodiment does not impose specific restrictions on this. The number of triggering components 200 is less than the number of the first connecting holes, and a minimum of two are required. One triggering component 200 is fixed to the bottom of the first connecting hole closest to the outer side. The specific number is not specifically limited. The fixed connection method between the triggering component 200 and the first connecting hole includes, but is not limited to, welding, threaded connection, and snap-fit, as long as it can be ensured that the triggering component 200 can still be fixed to the bottom of the corresponding first connecting hole after being triggered. Similarly, the specific number of the second connecting holes 310 can be three, four, or even more. The number of the first connecting holes and the second connecting holes 310 can be the same or different. This embodiment does not impose specific restrictions on this. The number of the first bolts 500 is the same as the number of triggering components 200. It should be further explained that the trigger component 200 is fixed to the bottom of the outermost first connecting hole among the plurality of first connecting holes. This means that the outermost first connecting hole among the plurality of first connecting holes is a hole with a bottom, and the trigger component 200 is fixed to the bottom of the corresponding first connecting hole. If the outermost first connecting hole among the plurality of first connecting holes is a through hole, then the trigger component 200 is fixed to the battery frame 50, located above the corresponding first connecting hole (closer to the roof relative to the first connecting hole), and the trigger component 200 is coaxially arranged with the corresponding first connecting hole.

[0056] In addition, in this embodiment, the first connecting hole on the outer side of the bottom front side of the battery frame 50 can be removed, and the trigger component 200 can be directly arranged at the position where the first connecting hole on the outer side is set. The outer second connecting hole 310 of the multiple second connecting holes 310 on the bottom guard plate 300 is correspondingly set with the trigger component 200. After the first bolt 500 passes through the second connecting hole 310 near the outer side of the multiple second connecting holes 310, it can still be fixedly connected to the trigger component 200 first, so that the other end of the bottom guard plate 300 is tightly attached to and fixed to the bottom front side of the battery frame 50.

[0057] In one specific implementation, such as Figure 4 As shown, one end of the first bolt 500 is inserted into the (untriggered) triggering component 200 (e.g., a pyrotechnic generator) and threadedly connected to the triggering component 200, so that the other end of the bottom cover 300 is tightly attached to and fixed to the bottom front side of the battery frame 50 (e.g., ...). Figure 3 As shown). Figure 7 As shown, after the triggering component 200 is triggered, an internal impact force is generated, which pushes the connecting end of the first bolt 500 to the triggering component 200 a certain distance out of the triggering component 200, but it is still threadedly connected to the triggering component 200. This causes the non-connecting end of the first bolt 500 to move away from the triggering component 200, i.e., as shown. Figures 5-7 As shown, while keeping the other end of the bottom guard plate 300 away from the bottom of the battery frame 50 and the bottom of the power battery 20, the other end of the bottom guard plate 300 is fixedly connected to the bottom front side of the battery frame 50 by the first bolt 500, the triggering component 200, and the battery frame 50.

[0058] In one embodiment of this utility model, a second bolt 600 passes through the middle second connecting hole 310 among a plurality of second connecting holes 310 and the middle first connecting hole among a plurality of first connecting holes, so that the other end of the bottom protective plate 300 is fixedly connected to the bottom front side of the battery frame 50; a weakened tear line 320 is provided around the middle second connecting hole 310; as Figures 5-8 As shown, after the triggering component 200 is triggered, during the process of pushing the first bolt 500 to move, the tear line 320 is weakened and torn by force, so that the other end of the bottom guard plate 300 is away from the bottom of the battery frame 50 and the bottom of the power battery 20.

[0059] When the triggering component 200 is triggered, the weakened tear line 320 on the periphery of the second connecting hole 310 in the middle is torn by force, so that there is no connection between the middle of the other end of the bottom guard plate 300 and the middle of the bottom front side of the battery frame 50 (in front of the power battery 20), which makes it easy for the air curtain 400 to quickly unfold towards the power battery 20 after it is ignited.

[0060] It should be noted that, in this embodiment, in the width direction of the vehicle, the first connecting hole near the outer side and the second connecting hole 310 located in the middle can be coaxial or non-coaxial (e.g., ...). Figure 3 As shown in the figure, as long as the first connection hole near the outside is located on the outside of the power battery 20, this embodiment does not impose specific restrictions.

[0061] In one embodiment of this utility model, such as Figure 9 As shown, the collision protection device 10 also includes a collision sensor 700 and a controller 800. The collision sensor 700 is fixed on the first crossbeam 110. The controller 800 is communicatively connected to the collision sensor 700, the triggering component 200, and the air curtain 400. The collision sensor 700 is used to acquire collision signals and send them to the controller 800. The controller 800 controls the triggering component 200 to be triggered and the air curtain 400 to be detonated according to the received collision signals.

[0062] It should be noted that the collision sensor 700 can be fixed to the bottom of the first crossbeam 110 or inside the first crossbeam 110. Multiple collision sensors 700 can be arranged at intervals on the first crossbeam 110. The fixing method can be adhesive or snap-fit; this embodiment does not impose specific limitations. The controller 800 can be an additional controller or a controller already present on the vehicle body 30, such as the vehicle control unit (VCU) or body control module (BCM). If it is an additional controller, it can be located on the front subframe 100 or in other positions on the vehicle body 30. The cables between the controller 800, collision sensor 700, triggering component 200, and curtain airbag 400 pass through holes in the front subframe 100 and battery housing 50 to achieve communication between them. Controlling the triggering component 200 and the curtain airbag 400 to detonate via the controller 800 is a conventional technical method.

[0063] In one embodiment of this utility model, the collision sensor 700 is a strain gauge pressure sensor. When the first crossbeam 110 collides with the sensor, strain will be generated. The strain gauge pressure sensor can generate a collision signal based on this strain, enabling early warning of collisions to the power battery 20.

[0064] In one embodiment of this utility model, such as Figure 10 As shown, a weakening groove 121 extending along its length is provided on the side of the second crossbeam 120 near the bottom guard plate 300, and the weakening groove 121 is H-shaped.

[0065] It should be noted that the length direction of the second crossbeam 120 is parallel to the width direction of the vehicle (Y direction in the figure). The second crossbeam 120 has a hollow structure, and the wall thickness of the second crossbeam 120 at the location of the weakening groove 121 is the thinnest. This makes the weakening groove 121 easy to crack under stress. When the air curtain 400 is detonated, the weakening groove 121 cracks under the impact force, and the air curtain 400 can extend out of the second crossbeam 120 from the weakening groove 121, thereby achieving the coverage of the bottom front side of the power battery 20.

[0066] In one embodiment of this utility model, the side of the second crossbeam 120 near the bottom guard plate 300 is made of polypropylene material filled with glass fiber.

[0067] It should be noted that the glass fiber-filled polypropylene material is prone to brittle fracture. The side of the second crossbeam 120 near the bottom guard plate 300 uses this brittle fracture material. This way, when the air curtain 400 is detonated, the side of the second crossbeam 120 near the bottom guard plate 300 is easily torn by the impact force, making it easier for the air curtain 400 to extend out of the second crossbeam 120.

[0068] In one embodiment of this utility model, the air curtain 400 is inflated in an L-shape, forming a space that accommodates the front subframe 100, the bottom of the power battery 20, and the underbody protection plate 300 after the triggering component 200 is activated. This allows the air curtain 400 to deploy first towards the underbody protection plate 300 and then towards the power battery 20 after being ignited, further covering the bottom of the power battery 20 and thus protecting it.

[0069] The collision protection device 10 disclosed in this utility model has its bottom surface of the first crossbeam 110 of the front subframe 100 located below the bottom surface of the power battery 20, and the air curtain 400 folded and fixed inside the second crossbeam 120. When the first crossbeam 110 is hit by an obstacle, the triggering component 200 is triggered, causing one end of the bottom guard plate 300 to rotate relative to the first crossbeam 110, driving the other end of the bottom guard plate 300 to open at a certain angle relative to the front subframe 100 towards the ground while still being fixed to the bottom of the battery frame 50. The air curtain 400 is detonated, extending out of the second crossbeam 120, and unfolding in the receiving space formed between the front subframe 100, the bottom of the power battery 20, and the bottom guard plate 300 towards the bottom guard plate 300 and towards the power battery 20, covering the bottom front side of the power battery 20. In the initial stage of air curtain 400 deployment, it can be considered a highly rigid body, maintaining the height difference between the underbody protection plate 300 and the bottom of the power battery 20. Obstacles cannot intrude into this created space, thus lifting the car and reducing the intrusion of obstacles into the power battery 20. After the air curtain 400 is fully deployed, its overall rigidity begins to decrease. As the car moves forward, obstacles come into contact with the underbody protection plate 300, absorbing the energy converted from velocity, further reducing the impact of obstacles on the power battery 20. Simultaneously, the car body 300 descends slowly. During descent, the air curtain 400 first contacts the obstacle, reducing the collision energy generated by the obstacle on the power battery 20 during a secondary impact, thereby protecting the power battery 20.

[0070] Example 2

[0071] This utility model also provides a car, including: the collision protection device 10, the power battery 20, and the front skid plate 40 as described in Embodiment 1; wherein, in the length direction of the car, the front subframe 100 of the collision protection device 10 is located in front of the power battery 20; the front skid plate 40 is located at the bottom of the front subframe 100, and in the length direction of the car, it is located in front of the bottom skid plate 300 and fixedly connected to the first crossbeam 110 of the front subframe 100, and one end of the bottom skid plate 300 is rotatably connected to the front skid plate 40, so that one end of the bottom skid plate 300 is rotatably connected to the bottom of the first crossbeam 110.

[0072] By adopting the above technical solution, one end of the bottom guard plate 300 is rotatably connected to the front guard plate 40 to ensure the integrity of the entire bottom guard plate of the car. In addition, the collision protection device 10 reduces the intrusion of the power battery 20 in the bottom scratch test, improves the collision resistance of the bottom of the car, thereby protecting the power battery 20, improving the safety of the occupants of new energy vehicles, and avoiding the situation of failing the bottom scratch test of the China Insurance Automotive Safety Index.

[0073] In one embodiment of the present invention, the automobile further includes a battery frame 50, which is fixed to the bottom of the vehicle body 30, and the power battery 20 is fixed inside the battery frame 50.

[0074] It should be noted that the battery frame 50 is located on the outer periphery of the power battery 20. In the height direction of the vehicle (Z direction in the figure), the bottom of the battery frame 50 can be located above the bottom of the battery frame 50, or it can be at the same height as the bottom of the battery frame 50. This embodiment does not impose specific restrictions on this.

[0075] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived from the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0076] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0077] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model 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. Therefore, they should not be construed as limitations on the utility model.

[0078] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0079] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0080] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A collision protection device for protecting a vehicle's power battery, wherein the power battery is fixed to the bottom of the vehicle body via a battery frame, characterized in that, The collision protection device includes: A front subframe is provided for fixing to the bottom of the vehicle body. In the length direction of the vehicle, the front subframe is located in front of the power battery. The front subframe includes a first crossbeam and a second crossbeam spaced apart in its length direction and extending in its width direction. The first crossbeam is located at the bottom of the front subframe. In the height direction of the vehicle, the bottom surface of the first crossbeam is located below the bottom surface of the power battery. In the length direction of the vehicle, the first crossbeam is further away from the power battery than the second crossbeam. A triggering component is fixed to the bottom front side of the battery frame and located on the outside of the power battery in the longitudinal direction of the vehicle, and can be triggered. The bottom guard plate is located at the bottom of the first crossbeam. In the length direction of the vehicle, one end of the bottom guard plate is rotatably connected to the bottom of the first crossbeam, and the other end is fixedly connected to the trigger component, closely attached to and fixed to the bottom front side of the battery frame, and close to the bottom of the power battery. An air curtain, which is folded and fixed inside the second crossbeam, and can extend out of the second crossbeam after being detonated; When the first crossbeam is impacted, the triggering component is activated. Based on the other end of the bottom guard plate being fixedly connected to the triggering component, the other end of the bottom guard plate is driven away from the bottom of the battery frame and the bottom of the power battery. One end of the bottom guard plate rotates relative to the first crossbeam, and a receiving space is formed between the front subframe, the bottom of the power battery, and the bottom guard plate. The air curtain is detonated, extends out of the second crossbeam, and unfolds within the receiving space in the direction closer to the bottom guard plate and closer to the power battery, covering the bottom front side of the power battery.

2. The collision protection device as described in claim 1, characterized in that, The collision protection device further includes a collision sensor and a controller. The collision sensor is fixed on the first crossbeam. The controller is communicatively connected to the collision sensor, the triggering component, and the air curtain. The collision sensor is used to acquire a collision signal and send it to the controller. The controller controls the triggering component to be triggered and the air curtain to be detonated according to the received collision signal.

3. The collision protection device as described in claim 2, characterized in that, The collision sensor is a strain gauge pressure sensor.

4. The collision protection device as described in any one of claims 1-3, characterized in that, The bottom front side of the battery frame is provided with a plurality of first connection holes spaced apart along its width direction. The triggering component is fixed to the bottom of the first connection hole near the outer side of the plurality of first connection holes and is located on the outer sides of the power battery in the width direction of the vehicle. The other end of the bottom protective plate is provided with a plurality of second connecting holes at intervals along its width direction, which correspond to the plurality of first connecting holes; After the first bolt passes through the second connecting hole near the outermost one of the plurality of second connecting holes, it is fixedly connected to the triggering component, so that the other end of the bottom guard plate is tightly attached to and fixed to the bottom front side of the battery frame and close to the bottom of the power battery; after the triggering component is triggered, it pushes the first bolt to move away from the bottom of the power battery, and keeps the other end of the bottom guard plate fixedly connected to the triggering component through the first bolt, thereby driving the other end of the bottom guard plate away from the bottom of the battery frame and the bottom of the power battery.

5. The collision protection device as described in claim 4, characterized in that, A second bolt passes through the middle second connecting hole among the plurality of second connecting holes and the middle first connecting hole among the plurality of first connecting holes, so that the other end of the bottom guard plate is fixedly connected to the bottom front side of the battery frame; a weakening tear line is provided around the second connecting hole located in the middle; when the triggering component is triggered, the weakening tear line is torn by force during the movement of the first bolt, so that the other end of the bottom guard plate is away from the bottom of the battery frame and the bottom of the power battery.

6. The collision protection device as described in claim 5, characterized in that, The triggering component is a pyrotechnic generator.

7. The collision protection device as described in any one of claims 1-3, characterized in that, The second crossbeam has a weakening groove extending along its length on the side near the bottom guard plate, and the weakening groove is H-shaped.

8. The collision protection device as described in claim 7, characterized in that, The side of the second crossbeam closest to the bottom guard plate is made of polypropylene material filled with glass fiber.

9. The collision protection device as described in claim 8, characterized in that, The air curtain is inflated in an L-shape, which is adapted to the receiving space formed between the front subframe, the bottom of the power battery and the bottom guard plate after the triggering component is triggered.

10. A car, characterized in that, include: The collision protection device, the power battery, and the front skid plate as described in any one of claims 1-9; in Along the length of the vehicle, the front subframe of the collision protection device is located in front of the power battery; The front skid plate is located at the bottom of the front subframe, in the length direction of the vehicle, in front of the underbody skid plate and fixedly connected to the first crossbeam of the front subframe. One end of the underbody skid plate is rotatably connected to the front skid plate, so that one end of the underbody skid plate is rotatably connected to the bottom of the first crossbeam.

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