Battery pack bottom collision protection structure and automobile

Abstract

The application relates to the technical field of automobile body structures, and particularly relates to a battery pack bottom collision protection structure and an automobile, which comprises a protection beam and a rotating motion mechanism, the rotating motion mechanism comprises a rotating base, a rotating piece and a fixed guide seat, the rotating base is fixedly installed on the protection beam, the rotating base is rotationally connected with one end of the rotating piece, the protection beam is rotated from a first position to a second position after being subjected to a collision, and the guide seat is connected to the other end of the rotating piece; when being in the first position, the height of the protection beam is H1; when being in the second position, the height of the protection beam is H2, and H2>H1. The battery pack bottom collision protection structure is a semi-active protection structure: compared with a fixed passive protection structure, the application can passively change the posture during the collision process, and the battery pack protection effect is further improved; compared with an active protection structure, the application does not have a driving device, and the cost is greatly reduced.

Description

Technical Field

[0001] This invention relates to the technical field of battery protection, specifically to a battery pack bottom impact protection structure and an automobile. Background Technology

[0002] Electric vehicle battery packs are typically located at the bottom of the vehicle, making them highly susceptible to safety risks from collisions. There are two existing solutions for protecting battery packs: one is a fixed, passive protective structure, such as CN214589076U and CN207676970U. This primarily involves adding a protective structure to the bottom of the vehicle or in front of the battery pack to buffer against collisions and protect the battery pack. Passive protective structures do not change shape or orientation during a collision, and this solution requires high strength in both the protective structure itself and its installation. The other is an active protection system, such as CN112644413A and CN218750323U. Active protection systems can detect obstacles penetrating under the vehicle and actively deploy a protective structure under the action of a drive mechanism to protect the battery pack. While this solution provides good protection, it is complex in structure and expensive. Summary of the Invention

[0003] One objective of this invention is to provide a battery pack bottom collision protection structure to solve the problems of high requirements for the strength of the battery pack protection structure itself and the installation strength of the passive protection structure in the prior art, as well as the problems of complex structure and high cost of active protection system; the second objective is to provide a vehicle.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A battery pack bottom impact protection structure includes a protective beam and a rotating mechanism. The rotating mechanism includes a rotating base, a rotating component, and a fixed guide seat. The rotating base is fixedly installed on the protective beam. The rotating base is rotatably connected to one end of the rotating component, and the protective beam rotates from a first position to a second position after being impacted. The guide seat is connected to the other end of the rotating component. In the first position, the height of the protective beam is H1; in the second position, the height of the protective beam is H2, where H2 > H1.

[0006] According to the above technical means, the protective beam first contacts the obstacle to provide protection. A guide seat is fixedly installed, and a rotating base is fixedly mounted on the protective beam. The rotating component and the rotating base are rotatably connected, thus the protective beam is rotatably mounted at the end of the rotating motion mechanism. In the first position, the height of the protective beam is H1; in the second position, the height of the protective beam is H2, where H2 > H1. When the protective beam rotates from the first position to the second position after a collision, the vehicle is slightly lifted, preventing direct impact between the front of the battery pack and the obstacle, thereby improving the stress state of the battery pack and achieving the function of protecting the battery pack. The battery pack bottom collision protection structure of this invention is a semi-active protection structure: compared to a fixed passive protection structure, this invention can passively change its posture during a collision, further improving the battery pack protection effect; compared to an active protection structure, this invention has no driving device, significantly reducing costs.

[0007] Furthermore, the guide seat has a connecting hole, the rotating member is connected to the connecting hole, and a first preload is formed between the rotating member and the guide seat. When the impact force is greater than the first preload, the rotating member moves axially relative to the guide seat along the connecting hole. A stop is sleeved on the outer periphery of the rotating member, and the outer diameter of the stop is greater than the diameter of the connecting hole.

[0008] According to the above technical means, when the impact force is greater than the first preload, the rotating component extends and retracts relative to the guide seat, causing the protective beam to move backward, thereby playing a certain role in buffering and absorbing energy. When the rotating component retracts until the stopper abuts against the guide seat, the linear movement of the rotating component relative to the guide seat is restricted. Under the continued action of the impact force, when the protective beam rotates from the first position to the second position, the vehicle is slightly lifted to avoid direct impact between the front of the battery pack and the obstacle, thereby improving the stress state of the battery pack and achieving the function of protecting the battery pack.

[0009] Furthermore, it also includes a limiting member and a limiting hole opened in the protective beam, one end of the limiting member being fixed and the other end of the limiting member extending into the limiting hole.

[0010] Based on the above technical means, the limiting component and the limiting hole cooperate with each other to limit the linear movement of the protective beam, so that the linear movement of the protective beam can be carried out stably, and the buffering effect brought about by the linear movement of the protective beam is more prominent.

[0011] Furthermore, the limiting hole includes a guide groove and a release hole that are connected together. The limiting member cooperates with the guide groove and a second preload is formed between the limiting member and the guide groove. When the impact force is greater than the second preload, the limiting member moves along the axis of the guide groove into the release hole. The diameter of the release hole is greater than the diameter of the limiting member.

[0012] According to the above-mentioned technical means, when the protective beam is impacted by an obstacle and the impact force is greater than the second preload, the protective beam moves relative to the limiting member, and the protective beam moves in the opposite direction of the vehicle's travel direction; when the limiting member moves into the release hole, the protective beam separates from the limiting member through the release hole, the limiting function of the limiting member is released, and the protective beam rotates downward under the action of the impact force. When the limiting member is fixed after passing through the limiting hole from bottom to top, the second preload can also prevent the protective beam from rotating under its own weight.

[0013] Furthermore, one end of the limiting hole is a semi-circular hole, and the disengagement hole is a circular hole; the distance between the center of the semi-circular hole and the circular hole, and the distance between the stop and the guide seat are equal.

[0014] According to the above technical means, when the protective beam moves to the point where the center axis of the limiting component passes through the center of the release hole, the stop component just comes into contact with the guide seat to prevent the protective beam from moving further.

[0015] Furthermore, one end of the rotating component is provided with a ball head, the rotating base is a ball hinge, and a limiting mechanism for limiting the rotation direction and rotation angle of the protective beam is provided at the connection between the ball head and the ball hinge.

[0016] Based on the above technical means, the relative rotation of the rotating part and the rotating base is achieved through the cooperation of the ball head and the ball joint. The limiting mechanism can be designed as needed to design the rotation direction and rotation angle of the protective beam, so that the protective beam can only rotate in one direction and within one angle range, thereby controlling the protective beam to rotate from the first position to the second position under the action of the impact force.

[0017] Furthermore, the rotation axis of the protective beam is perpendicular to the central axis of the rotating component, and the rotation angle is 0° to 90°.

[0018] According to the above technical means, when the rotating parts and the protective beam are arranged horizontally, the protective beam rotates downward under the action of the impact force, and the rotation angle range is 0° to 90°. The larger the rotation angle, the greater the distance the vehicle is lifted upward. The rotation direction and rotation angle can be limited by the structural design of the ball joint and the ball hinge, or by selecting ball hinge products of different specifications and models.

[0019] Furthermore, the protective beam is a rectangular beam, and the rotation angle is 90°.

[0020] According to the above technical means, the cross-section of the rectangular beam is rectangular, with a length of H2 and a width of H1. After the protective beam is impacted, the long side of the protective beam rotates from the top of the obstacle to the short side of the protective beam being at the top of the obstacle. The vehicle is lifted, avoiding direct impact between the front of the battery pack and the obstacle, thereby improving the stress state of the battery pack and achieving the function of protecting the battery pack.

[0021] Furthermore, the protective beam includes a first component, a second component, and a reinforcing member. The first component is connected above the second component, and a cavity is formed between the first component and the second component. There are multiple reinforcing members, and the multiple reinforcing members are evenly distributed in the cavity.

[0022] According to the above-mentioned technical means, the first component and the second component are connected to form a rectangular beam, which is convenient for processing and forming, and also convenient for arranging reinforcing members in the cavity to improve the strength of the rectangular beam to meet the high strength requirements of the protective beam.

[0023] An automobile includes a chassis, a battery, and a battery pack bottom collision protection structure as described above. The guide seat is fixedly connected to the chassis, the battery is mounted on the chassis, the axis of the protective beam is perpendicular to the direction of travel of the automobile, and the battery and the rotary motion mechanism are both located behind the protective beam.

[0024] According to the above technical means, the battery and the rotating motion mechanism are both located behind the protective beam. If an obstacle is encountered, the protective beam will first come into contact with and impact the obstacle. After the front end of the protective beam is impacted by the obstacle, it will rotate from the first position to the second position, and the vehicle will be slightly lifted to avoid direct impact between the front of the battery pack and the obstacle. This will improve the stress state of the battery pack, protect the battery pack, and thus improve the driving safety of the vehicle.

[0025] The beneficial effects of this invention are:

[0026] The battery pack bottom collision protection structure of this invention, when the protective beam rotates from a first position to a second position after a collision, slightly raises the vehicle, preventing direct impact between the front of the battery pack and obstacles. This improves the stress state of the battery pack, thus protecting it and enhancing driving safety. This battery pack bottom collision protection structure is a semi-active protection structure: compared to a fixed passive protection structure, this invention can passively change its posture during a collision, further enhancing the battery pack protection effect; compared to an active protection structure, this invention has no driving device, significantly reducing costs. Attached Figure Description

[0027] Figure 1 A schematic diagram of the impact protection structure at the bottom of the battery pack;

[0028] Figure 2 This is a schematic diagram of the rotary motion mechanism;

[0029] Figure 3 This is a structural schematic diagram of the first component;

[0030] Figure 4 This is a structural diagram of the second component;

[0031] Figure 5 This is a structural schematic diagram of the reinforcing component;

[0032] Among them, 1. Protective beam; 11. First component; 111. First front surface; 112. Upper surface; 113. First rear surface; 12. Second component; 121. Second front surface; 122. Lower surface; 123. Second rear surface; 124. Through hole; 125. Round hole; 13. Reinforcing member; 131. Upper flange; 132. Lower flange; 133. Front flange; 134. Rear flange; 2. Rotating base; 3. Rotating component; 31. Ball head; 32. Stop component; 4. Guide seat; 41. Connecting hole; 5. Limiting component; 6. Limiting hole; 61. Guide groove; 62. Release hole. Detailed Implementation

[0033] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0034] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention 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.

[0035] This embodiment proposes a battery pack bottom collision protection structure, including a protective beam 1 and a rotation mechanism. The rotation mechanism includes a rotating base 2, a rotating component 3, and a fixedly mounted guide seat 4. The rotating base 2 is fixedly installed on the protective beam 1, and is rotatably connected to one end of the rotating component 3. After the protective beam 1 is impacted, it rotates from a first position to a second position. The guide seat 4 is connected to the other end of the rotating component 3. In the first position, the height of the protective beam 1 is H1; in the second position, the height of the protective beam 1 is H2, where H2 > H1. The guide seat 4 can be fixedly mounted on the vehicle chassis. During the rotation of the protective beam 1 after an impact, its height increases from H1 to H2, continuously lifting the vehicle upwards. Multiple sets of the rotation mechanism can be evenly distributed and connected to the sides of the protective beam 1 to ensure the strength and movement stability of the protective beam 1.

[0036] In this embodiment, the protective beam 1 first contacts the obstacle to provide protection. The guide seat 4 is fixedly installed, and the rotating base 2 is fixedly installed on the protective beam 1. The rotating component 3 and the rotating base 2 are rotatably connected, so that the protective beam 1 is rotatably installed at the end of the rotating motion mechanism. In the first position, the height of the protective beam 1 is H1; in the second position, the height of the protective beam 1 is H2, where H2 > H1. When the protective beam 1 is impacted and rotates from the first position to the second position, the vehicle is slightly lifted to avoid direct impact between the front of the battery pack and the obstacle, thereby improving the stress state of the battery pack and achieving the function of protecting the battery pack.

[0037] In this embodiment, the rotation of the protective beam 1 relative to the guide seat 4 is achieved through a ball joint structure. Specifically, one end of the rotating component 3 is provided with a ball head 31, the rotating base 2 is a ball joint, and a limiting mechanism for restricting the rotation direction and angle of the protective beam 1 is provided at the connection between the ball head 31 and the ball joint. In specific implementation, the relative rotation of the rotating component 3 and the rotating base 2 is achieved through the cooperation of the ball head 31 and the ball joint. Generally, the degree of freedom of the ball joint structure is rotation within a range of 360°. The setting of the limiting mechanism can be designed as needed to restrict the rotation direction and angle of the protective beam 1, so that the protective beam 1 can only rotate in one direction and within a certain angle range, thereby controlling the protective beam 1 to rotate from the first position to the second position under the action of impact force. The present invention can select ball joint structures with limiting mechanisms available on the market as needed. In addition, it should be noted that the rotation of the protective beam 1 relative to the guide seat 4 in the present invention is not limited to being achieved through a ball joint structure. Other rotation structures that can achieve the rotation of the protective beam 1 relative to the guide seat 4 within a set direction and a set angle range are also applicable to the present invention.

[0038] Furthermore, the rotation axis of the protective beam 1 is perpendicular to the central axis of the rotating component 3, and the rotation angle is 0° to 90°. When the rotating component 3 and the protective beam 1 are arranged horizontally, under the action of the impact force, the front end of the protective beam 1 rotates downward after being impacted, with a rotation angle range of 0° to 90°. The larger the rotation angle, the greater the upward lifting distance of the vehicle. The rotation direction and rotation angle can be limited by the structural design of the ball joint 31 and the ball joint, or by selecting ball joint products of different specifications and models. Preferably, the protective beam 1 is a rectangular beam, and the rotation angle is 90°. The cross-section of the rectangular beam is rectangular, with a length of H2 and a width of H1. After the protective beam 1 is impacted, the long side of the protective beam 1 rotates from being at the top of the obstacle to the short side of the protective beam 1 being at the top of the obstacle. The vehicle is lifted, avoiding direct impact between the front of the battery pack and the obstacle, thereby improving the stress state of the battery pack and achieving the function of protecting the battery pack.

[0039] In one embodiment, the protective beam 1 undergoes linear movement for buffering before rotating upon impact. Specifically, the guide seat 4 has a connecting hole 41, and the rotating member 3 is connected to the connecting hole 41, with a first preload forming between the rotating member 3 and the guide seat 4. When the impact force exceeds the first preload, the rotating member 3 moves axially relative to the guide seat 4 along the connecting hole 41. A stop 32 is fitted around the outer periphery of the rotating member 3, and the outer diameter of the stop 32 is larger than the diameter of the connecting hole 41. When the impact force exceeds the first preload, the rotating member 3 extends and retracts relative to the guide seat 4, causing the protective beam 1 to move backward, thereby providing a certain buffering and energy absorption effect. When the rotating member 3 retracts until the stop 32 abuts against the guide seat 4, the linear movement of the rotating member 3 relative to the guide seat 4 is restricted. Under the continued action of the impact force, when the protective beam 1 rotates from the first position to the second position, the vehicle is slightly lifted, preventing the front of the battery pack from directly impacting the obstacle, thereby improving the stress state of the battery pack and achieving the function of protecting the battery pack. The protective beam 1 moves linearly first and then rotates. Compared with the scheme that only rotates for protection, on the one hand, the linear movement process has a buffering effect on the impact force, which can improve the protective effect of the protective beam 1. On the other hand, when the impact force is only enough to drive the protective beam 1 to move linearly, the protective beam 1 will only move linearly and will not rotate, which can reduce the difficulty of the protective beam 1 returning to its original position after the impact.

[0040] To ensure the stability of the linear movement of the protective beam 1, this embodiment also includes a limiting member 5 and a limiting hole 6 formed in the protective beam 1. One end of the limiting member 5 is fixed, and the other end of the limiting member 5 extends into the limiting hole 6. Specifically, the upper end of the limiting member 5 is fixed, and the lower end of the limiting member 5 cooperates with the limiting hole 6. The limiting member 5 can be specifically selected from mounting bolts. The number of limiting members 5 and the limiting holes 6 are equal to the number of rotating motion devices and their positions correspond. In this embodiment, the limiting member 5 and the limiting hole 6 cooperate to limit the linear movement of the protective beam 1, making the linear movement of the protective beam 1 stable and highlighting the buffering effect brought about by the linear movement of the protective beam 1. Specifically, the limiting hole 6 includes a guide groove 61 and a release hole 62 connected together. The limiting member 5 cooperates with the guide groove 61, and a second pre-tightening force is formed between the limiting member 5 and the guide groove 61. When the impact force is greater than the second pre-tightening force, the limiting member 5 moves along the axis of the guide groove 61 into the release hole 62. The diameter of the release hole 62 is greater than the diameter of the limiting member 5. In this embodiment, the guide groove 61 includes a rectangular groove and a semi-circular hole with a diameter equal to the width of the rectangular groove. The diameter of the limiting member 5 is equal to or slightly greater than the diameter of the semi-circular hole. The semi-circular hole is connected to one end of the rectangular groove, and the release hole 62 is connected to the other end of the rectangular groove. The release hole 62 is a circular hole. The distance between the center of the semi-circular hole and the circular hole is equal to the distance between the stop member 32 and the guide seat 4. In this embodiment, when the protective beam 1 is impacted by an obstacle and the impact force is greater than the second preload, the protective beam 1 moves relative to the limiting member 5, moving in the opposite direction of the vehicle's travel direction. When the limiting member 5 moves into the release hole 62, the protective beam 1 separates from the limiting member 5 through the release hole 62, the limiting effect of the limiting member 5 is released, and the protective beam 1 rotates downward under the impact force. When the protective beam 1 moves in the opposite direction of the vehicle's travel direction until the central axis of the limiting member 5 passes through the center of the release hole 62, the stop member 32 just abuts against the guide seat 4 to prevent further movement of the protective beam 1. When the limiting member 5 is fixed after passing through the limiting hole 6 from bottom to top, the second preload can also prevent the protective beam 1 from rotating under its own weight.

[0041] Additionally, it should be noted that a first preload is formed between the rotating component 3 and the guide seat 4, and a second preload is formed between the limiting component 5 and the guide groove 61. When the magnitudes of the first and second preloads are equal, and the impact force is greater than either the first or second preload, the limiting function of the limiting component 5 is released, and the rotating component 3 can extend and retract relative to the guide seat 4. When the first and second preloads are not equal, and the impact force is greater than the larger of the first and second preloads, the limiting function of the limiting component 5 is released, and the rotating component 3 can extend and retract relative to the guide seat 4.

[0042] In one embodiment, to obtain a high-strength protective beam 1, the protective beam 1 of the present invention includes a first component 11, a second component 12, and reinforcing members 13. The first component 11 is connected above the second component 12, and a cavity is formed between the first component 11 and the second component 12. Multiple reinforcing members 13 are evenly distributed within the cavity. In this embodiment, the first component 11 and the second component 12 are connected to form a rectangular beam, which facilitates processing and shaping, and allows for the placement of reinforcing members 13 within the cavity to improve the strength of the rectangular beam and meet the high-strength requirements of the protective beam 1.

[0043] Specifically, the first component 11 has an inverted U-shaped structure, and the second component 12 has a U-shaped structure. The first component 11 includes a first front surface 111, an upper surface 112, and a first rear surface 113 connected in sequence. The second component 12 includes a second front surface 121, a lower surface 122, and a second rear surface 123 connected in sequence. The second front surface 121 and the second rear surface 123 have a plurality of evenly distributed circular holes 125. The second component 12 partially surrounds the first component 11 from bottom to top. The second front surface 121 is connected to the first front surface 111 through the circular holes by plug welding, and the second rear surface 123 is connected to the first rear surface 113 through the circular holes 125 by plug welding. The reinforcing member 13 includes a main body and four flanges connected to the four sides of the main body: an upper flange 131, a lower flange 132, a front flange 133, and a rear flange 134. The front flange 133 is spot-welded to the first front surface 111, the rear flange 134 is spot-welded to the first rear surface 113, the upper flange 131 is spot-welded to the upper surface 112, and the lower flange 132 is spot-welded to the lower surface 122. Only through this structural design and connection method can the rectangular beam structure reinforced by the reinforcing member 13 be fabricated.

[0044] Specifically, the limiting hole 6 is provided on the upper surface 112, and a through hole 124 is provided on the lower surface 122 at the position corresponding to the limiting hole 6. The shape and size of the through hole 124 can be the same as that of the limiting hole 6, or it can be a through hole with a diameter larger than that of the disengagement hole 62. During installation, the limiting member 5 passes through the through hole 124 and the limiting hole 6 on the lower surface 122 of the second component 12 from bottom to top and is then fixedly connected to the vehicle chassis.

[0045] The battery pack bottom collision protection structure of the present invention is a semi-active battery pack bottom collision protection structure. Compared with the fixed passive protection structure, this structure can passively change its posture during the collision, effectively improving the battery pack protection effect. Compared with the active protection structure, it has no driving device, which greatly reduces the cost.

[0046] This embodiment also proposes a vehicle, including a chassis, a battery, and a bottom collision protection structure for the battery pack as described above. The guide seat 4 is fixedly connected to the chassis, the battery is mounted on the chassis, the axis of the protective beam 1 is perpendicular to the vehicle's direction of travel, and the battery and the rotary motion mechanism are both located behind the protective beam 1. Here, "behind" refers to the direction of vehicle travel.

[0047] According to the above technical means, the battery and the rotating motion mechanism are both located behind the protective beam 1. If an obstacle is encountered, the protective beam 1 will first come into contact with and collide with the obstacle. After the front end of the protective beam 1 is hit by the obstacle, it will rotate from the first position to the second position, and the vehicle will be slightly lifted to avoid the front of the battery pack from directly colliding with the obstacle. This will improve the stress state of the battery pack, protect the battery pack, and thus improve the driving safety of the vehicle.

[0048] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A battery pack bottom impact protection structure, characterized in that, The device includes a protective beam (1) and a rotating mechanism. The rotating mechanism includes a rotating base (2), a rotating component (3), and a fixed guide seat (4). The rotating base (2) is fixedly installed on the protective beam (1). The rotating base (2) is rotatably connected to one end of the rotating component (3), and the protective beam (1) rotates from a first position to a second position after being impacted. The guide seat (4) is connected to the other end of the rotating component (3). In the first position, the height of the protective beam (1) is H1. In the second position, the height of the protective beam (1) is H2, where H2 > H1. One end of the rotating component (3) is provided with a ball head (31), the rotating base (2) is a ball joint, and the connection between the ball head (31) and the ball joint is provided with a limiting mechanism for limiting the rotation direction and rotation angle of the protective beam (1); The guide seat (4) has a connecting hole (41), the rotating part (3) is connected to the connecting hole (41), and a first preload is formed between the rotating part (3) and the guide seat (4). When the impact force is greater than the first preload, the rotating part (3) moves axially relative to the guide seat (4) along the connecting hole (41). A stop (32) is sleeved on the outer periphery of the rotating part (3), and the outer diameter of the stop (32) is greater than the diameter of the connecting hole (41). It also includes a limiting member (5) and a limiting hole (6) opened in the protective beam (1). One end of the limiting member (5) is fixed and the other end of the limiting member (5) extends into the limiting hole (6). The limiting hole (6) includes a guide groove (61) and a release hole (62) connected in a communication manner. The limiting member (5) cooperates with the guide groove (61) and a second pre-tightening force is formed between the limiting member (5) and the guide groove (61). When the impact force is greater than the second pre-tightening force, the limiting member (5) moves along the axis of the guide groove (61) into the release hole (62). The diameter of the release hole (62) is greater than the diameter of the limiting member (5). The protective beam (1) includes a first component (11) and a second component (12). The first component (11) is connected above the second component (12), and a cavity is formed between the first component (11) and the second component (12). The limiting hole (6) is opened on the upper surface (112) of the first component (11). The lower surface (122) of the second component (12) is provided with a through hole (124) corresponding to the position of the limiting hole (6). The diameter of the through hole (124) is larger than the diameter of the release hole (62). The limiting member (5) passes through the through hole (124) and the limiting hole (6) from bottom to top and is fixedly connected to the car chassis. The first preload force is equal to the second preload force; when the impact force is greater than or equal to the first preload force and the second preload force, the rotating part (3) is triggered to move axially relative to the guide seat (4), and the limiting part (5) slides into the release hole (62) to release the limiting.

2. The battery pack bottom collision protection structure according to claim 1, characterized in that, One end of the limiting hole (6) is a semi-circular hole, and the disengagement hole (62) is a round hole; the distance between the center of the semi-circular hole and the round hole, and the distance between the stop (32) and the guide seat (4) are equal.

3. The battery pack bottom collision protection structure according to claim 1, characterized in that, The rotation axis of the protective beam (1) is perpendicular to the central axis of the rotating component (3), and the rotation angle is 0°~90°.

4. The battery pack bottom collision protection structure according to claim 3, characterized in that, The protective beam (1) is a rectangular beam, and the rotation angle is 90°.

5. The battery pack bottom impact protection structure according to any one of claims 1 to 2, characterized in that, The protective beam (1) includes a reinforcing member (13), and the reinforcing member (13) is multiple and the multiple reinforcing members (13) are evenly distributed in the cavity.

6. A car, characterized in that, The battery pack includes a chassis, a battery, and a bottom collision protection structure as described in any one of claims 1 to 5. The guide seat (4) is fixedly connected to the chassis, the battery is mounted on the chassis, the axis of the protective beam (1) is perpendicular to the direction of travel of the vehicle, and the battery and the rotating motion mechanism are both located behind the protective beam (1).

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