Vehicle battery pack protection structure

Abstract

The utility model relates to the technical field of electric vehicles, in particular to a vehicle battery pack protection structure. Comprising a doorsill assembly and an auxiliary energy absorption supporting mechanism, the doorsill assembly comprises a doorsill outer plate and a doorsill beam, the doorsill outer plate is arranged on the outer side of the tail end of the doorsill beam, a first energy absorption cavity is defined by the doorsill outer plate and the outer side face of the doorsill beam, and a second energy absorption cavity is formed in the doorsill beam; a first transverse reinforcing rib plate, a first longitudinal reinforcing rib plate and a first inclined reinforcing rib plate are arranged in the second energy absorption cavity; the auxiliary energy absorption supporting mechanism comprises a threshold side supporting plate, a battery frame and a floor structure, the two ends of the threshold side supporting plate are fixed to the upper surface of the threshold beam and the floor structure respectively, and the outer side of the battery frame is fixedly connected with the threshold beam. On the basis that the structural strength is guaranteed, a better energy absorption effect is achieved, and therefore the width of the crumple energy absorption area can be reduced compared with a traditional vehicle, and under the condition that the width of the vehicle is not changed, the space of a battery pack is increased, and the endurance mileage of the vehicle is increased.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a vehicle battery pack protection structure. Background Art

[0002] Compared with traditional vehicles, electric vehicles have many differences in body structure and power system. The most obvious difference is that pure electric vehicles are equipped with power batteries and their corresponding control circuits under the floor of the vehicle body. The body structure design of pure electric vehicles must not only meet the safety protection requirements of traditional fuel vehicles, but also meet the safety protection requirements of power batteries and their control circuits. Therefore, the requirements for collision safety performance of pure electric vehicles are higher than those of traditional vehicles. At present, the goal of battery safety protection is to ensure that the deformation of the body structure during the collision will not squeeze the battery module, the battery module will not deform, leak, catch fire, explode, and the insulation resistance will not fail.

[0003] The design of traditional vehicles is only for the protection of passengers. Under the condition of satisfying the protection of passengers, the threshold is allowed to have a large intrusion, and the body structure and floor can also have a large Z-direction deformation. However, in the structure of pure electric vehicles, since the battery pack is installed under the body floor, the large Z-direction deformation of the body structure and floor will hit or squeeze the battery module in the Z direction, causing the failure of insulation resistance, and even the danger of leakage, fire, explosion, etc. of the battery pack. In addition, excessive intrusion of the threshold will also cause the body structure to hit or squeeze the battery module in the Y direction, which will also bring about the safety problem of the battery pack. In order to solve the above problems, the common practice is to continuously strengthen the vehicle's threshold structure, but the strengthening of the threshold structure will also lead to an increase in the weight of the vehicle. In order to avoid damage to the battery due to side impact and increase the space for deformation and collapse, the threshold structure and the battery are kept at a large distance, which leads to a reduction in the installation space of the battery, which in turn affects the vehicle's cruising range. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a vehicle battery pack protection structure.

[0005] The present application provides a protective structure for a vehicle battery pack, including: a sill assembly and an auxiliary energy-absorbing support mechanism. The sill assembly includes an outer sill panel and a sill beam. The outer sill panel is disposed outside the end of the sill beam and encloses a first energy-absorbing cavity with the outer side surface of the sill beam. A second energy-absorbing cavity is provided inside the sill beam. Inside the second energy-absorbing cavity, there are a first transverse reinforcing rib plate, a first longitudinal reinforcing rib plate, and a first inclined reinforcing rib plate. The first transverse reinforcing rib plate divides the second energy-absorbing cavity into an upper chamber and a lower chamber. The first longitudinal reinforcing rib plate is distributed in the upper chamber and the lower chamber. The first inclined reinforcing rib plate is inclined, and the upper end of the first inclined reinforcing rib plate is located inside the lower end. The auxiliary energy-absorbing support mechanism includes a sill side support plate, a battery frame, and a floor structure. The two ends of the sill side support plate are respectively fixed on the upper surface of the sill beam and the floor structure. The outer side of the battery frame is fixedly connected to the sill beam.

[0006] In some embodiments, the first inclined reinforcing rib plate is located in the lower chamber, and the upper end of the first inclined reinforcing rib plate is connected to the first transverse reinforcing rib plate.

[0007] In some embodiments, the sill beam is made of an alloy material.

[0008] In some embodiments, the upper end and the lower end of the outer sill panel are respectively fixedly connected to the sill beam. The middle part of the outer sill panel bends away from the sill beam to form the first energy-absorbing cavity between the outer sill panel and the sill beam.

[0009] In some embodiments, a sill reinforcing plate is further included. The sill reinforcing plate is disposed in the first energy-absorbing cavity. The upper end of the sill reinforcing plate is fixed between the upper end of the outer sill panel and the sill beam, and the lower end of the sill reinforcing plate is fixed between the lower end of the outer sill panel and the sill beam. The middle part of the sill reinforcing plate bends away from the sill beam, and there are gaps between the middle part of the sill reinforcing plate and both the outer sill panel and the sill beam.

[0010] In some embodiments, a third energy-absorbing cavity is provided inside the battery frame. Inside the third energy-absorbing cavity, there is a second reinforcing rib plate. The second reinforcing rib plate is horizontally arranged, vertically arranged, or inclinedly arranged.

[0011] In some embodiments, an L-shaped mating surface is formed on the outer side of the battery frame. The lower surface of the sill beam overlaps on the L-shaped mating surface, and the lower surface of the sill beam is fixedly connected to the L-shaped mating surface by threaded fasteners.

[0012] In some embodiments, the threaded fastener passes through the outer sidewall of the sill beam and the outer sidewall of the battery frame in sequence to fixedly connect the sill beam and the battery frame.

[0013] In some embodiments, the Z - direction coincidence amount of the battery frame and the sill beam accounts for more than 50% of the total Z - direction height of the sill beam.

[0014] In some embodiments, the floor structure includes a front floor, a front seat reinforcing longitudinal beam, and a front seat cross beam. The front seat cross beam, the front seat reinforcing longitudinal beam, and the sill side support plate are all fixed on the upper surface of the front floor. Both ends of the front seat cross beam are respectively fixed on the sill beams on both sides.

[0015] The technical solution provided by the embodiments of the present application has the following advantages compared with the prior art:

[0016] For the vehicle battery pack protection structure provided by the embodiments of the present application, a second energy - absorbing cavity is arranged in the sill beam, and the outer sill panel is arranged outside the sill beam to enclose a first energy - absorbing cavity with the outer side surface of the sill beam. The first energy - absorbing cavity and the second energy - absorbing cavity can absorb part of the collision kinetic energy when the vehicle is subjected to a side impact. A first transverse reinforcing rib plate, a first longitudinal reinforcing rib plate, and a first inclined reinforcing rib plate are arranged in the second energy - absorbing cavity to increase the structural strength of the sill assembly. At the same time, the first inclined reinforcing rib plate is inclined, and the upper end of the first inclined reinforcing rib plate is located inside the lower end. When the sill beam is subjected to a side impact, the impact force can be transmitted along the direction of the first inclined reinforcing rib plate to the floor structure above the battery pack as much as possible; the sill side support plate in the auxiliary energy - absorbing support mechanism connects the sill beam and the floor structure, and the floor structure protects the battery pack from above. The battery frame serves as the last layer of protection structure for the battery pack in the lateral direction, completely dissipating the kinetic energy of the side impact and ensuring a small lateral intrusion of the sill assembly. Since the sill assembly has a first energy - absorbing cavity and a second energy - absorbing cavity, on the basis of ensuring structural strength, it has a better energy - absorbing effect. Therefore, the width of the crush - energy - absorbing area formed by the outer sill panel, the sill beam, and the battery frame can be reduced compared with traditional vehicles. Thus, with the vehicle width unchanged, the space of the battery pack can be increased, and then a larger battery pack can be arranged to improve the cruising range of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the vehicle battery pack protection structure described in the embodiment of the present application.

[0020] Among them, 1, sill beam; 10, first transverse reinforcing rib plate; 11, first inclined reinforcing rib plate; 12, first longitudinal reinforcing rib plate; 101, upper chamber; 102, lower chamber; 2, outer sill panel; 201, first energy absorption chamber; 3, sill reinforcement plate; 4, battery frame; 41, second reinforcing rib plate; 42, connecting part; 5, battery pack; 6, floor structure; 7, sill side support plate; 8, threaded fastener. Detailed implementation manners

[0021] In order to more clearly understand the above-mentioned objects, features and advantages of the present application, the following will further describe the solutions of the present application. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0022] In the following description, many specific details are set forth to fully understand the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present application, rather than all the embodiments.

[0023] In the structure of a pure electric vehicle, since the battery pack is installed under the vehicle body floor, a large Z-direction deformation of the vehicle body structure members and the floor will impact or squeeze the battery module in the Z direction, thereby causing the failure of the insulation resistance and even dangerous situations such as leakage, fire, and explosion of the battery pack. In addition, excessive intrusion of the sill will also cause the problem that the vehicle body structure members impact or squeeze the battery module in the Y direction, which will also bring safety problems to the battery pack. To solve the above problems, the common practice is to continuously strengthen the sill structure of the vehicle, but the strengthening of the sill structure will simultaneously increase the vehicle weight. To avoid damage to the battery caused by side impacts and increase the space for deformation and collapse, a large distance is maintained between the sill structure and the battery, which results in a reduction in the installation space of the battery, and further affects the vehicle's cruising range.

[0024] To solve the above technical problems, as Figure 1As shown in the figure, an embodiment of the present application provides a vehicle battery pack protection structure, including a sill assembly and an auxiliary energy absorption mechanism. The sill assembly includes an outer sill panel 2 and a sill beam 1. The outer sill panel 2 is disposed on the outer side of the end of the sill beam 1. The sill beam 1 is arranged along the front-rear direction of the vehicle. The end of the sill beam 1 close to the vehicle head is the front end, and the end close to the vehicle tail is the end. The side close to the vehicle center is the inner side, and the side far from the vehicle center is the outer side. The outer sill panel 2 is disposed on the outer side of the sill beam 1, that is to say, the outer sill panel 2 is disposed on the side of the sill beam 1 relatively far from the vehicle center. As Figure 1 shown, at this cross-section position of the vehicle, from the outside to the inside are the outer sill panel 2 and the sill beam 1 in sequence. The upper and lower ends of the outer sill panel 2 are respectively connected to the upper and lower ends of the outer side surface of the sill beam 1 (the side surface of the sill beam 1 far from the vehicle center). The outer sill panel 2 and the outer side surface of the sill beam 1 enclose a first energy absorption cavity 201. A second energy absorption cavity is provided inside the sill beam 1. Inside the second energy absorption cavity, there are a first horizontal reinforcing rib plate 10, a first vertical reinforcing rib plate 12, and a first inclined reinforcing rib plate 11. The first horizontal reinforcing rib plate 10 is arranged horizontally, and the first vertical reinforcing rib plate 12 is arranged vertically. The first horizontal reinforcing rib plate 10 divides the second energy absorption cavity 201 into an upper chamber 101 and a lower chamber 102. The first vertical reinforcing rib plate 12 is distributed in the upper chamber 101 and the lower chamber 102. Specifically, one or more first vertical reinforcing rib plates 12 are provided in the upper chamber 101, dividing the upper chamber 101 into a plurality of independent chambers arranged left and right. One or more first vertical reinforcing rib plates 12 are provided in the lower chamber 102, dividing the lower chamber 102 into a plurality of independent chambers arranged left and right. The first horizontal reinforcing rib plate 10 and the first vertical reinforcing rib plate 12 mainly play a role in structural reinforcement. At the same time, the left and right ends of the first horizontal reinforcing rib plate 10 are respectively connected to the left side wall and the right side wall of the sill beam 1. When encountering a side impact, the impact force will be transmitted along the first horizontal reinforcing rib plate 10, and the first horizontal reinforcing rib plate 10 can dissipate the kinetic energy of the impact to a certain extent. The upper end of the first inclined reinforcing rib plate 11 is located inside the lower end. The purpose of this setting is to transfer the side impact kinetic energy to the floor structure 6 above the battery pack 5 as much as possible.

[0025] The auxiliary energy absorption support mechanism includes a sill side support plate 7, a battery frame 4, and a floor structure 6. The floor structure 6 is located above the battery pack 5. The battery frame 4 is located between the battery pack 5 and the sill beam 1 and is fixedly connected to the sill beam 1. One end of the sill side support plate 7 is fixedly connected to the upper surface of the sill beam 1, and the other end is fixedly connected to the floor structure 6. The auxiliary energy absorption support structure forms protection for the battery pack 5 from above.

[0026] The protection structure of the vehicle battery pack 5 provided by the embodiments of the present application is provided with a second energy absorption cavity 201 in the sill beam 1. The outer sill panel 2 is arranged on the outer side of the sill beam 1 and encloses a first energy absorption cavity 201 with the outer side surface of the sill beam 1. The first energy absorption cavity 201 and the second energy absorption cavity can absorb part of the collision kinetic energy when the vehicle is laterally impacted. A first transverse reinforcing rib plate 10, a first longitudinal reinforcing rib plate 12 and a first inclined reinforcing rib plate 11 are arranged in the second energy absorption cavity to increase the structural strength of the sill assembly. At the same time, the first inclined reinforcing rib plate 11 is inclined, and the upper end of the first inclined reinforcing rib plate 11 is located inside the lower end, so that when the sill beam 1 is laterally impacted, the impact force can be transmitted to the floor structure 6 above the battery pack 5 as much as possible along the direction of the first inclined reinforcing rib plate 11; the sill side support plate 7 in the auxiliary energy absorption support mechanism connects the sill beam 1 and the floor structure 6, and the floor structure 6 protects the battery pack 5 from above. The battery frame 4 serves as the last layer of protection structure for the battery pack 5 laterally, completely dissipating the kinetic energy of the lateral impact and ensuring a small lateral intrusion of the sill assembly. Since the sill assembly has the first energy absorption cavity 201 and the second energy absorption cavity, on the basis of ensuring the structural strength, it has a better energy absorption effect. Therefore, the width of the crush energy absorption area (in the embodiments of the present application, the width of the crush energy absorption area is the width of the battery frame plus the width of the sill assembly) can be reduced compared with traditional vehicles. Thus, without changing the vehicle width, the space of the battery pack 5 can be increased, and then a larger battery pack 5 can be arranged to improve the cruising range of the vehicle.

[0027] Further, in some embodiments of the present application, the first inclined reinforcing rib plate 11 is located in the lower chamber 102, and the upper end of the first inclined reinforcing rib plate 11 is connected to the first transverse reinforcing rib plate 10. Specifically, in some embodiments of the present application, the upper chamber 101 is correspondingly arranged with the floor structure 6, and the lower chamber 102 is correspondingly arranged with the battery frame 4. The first transverse reinforcing rib plate 10 is located between the floor structure 6 and the battery frame 4 in the vertical direction. The first inclined reinforcing rib plate 11 is arranged in the lower chamber 102 and the upper end is connected to the first transverse reinforcing rib plate 10. In this way, when laterally impacted, the impact kinetic energy is transmitted to the first transverse reinforcing rib plate 10 along the first inclined reinforcing rib plate 11, and the impact kinetic energy is transmitted to the floor structure 6 above the battery as much as possible, reducing the damage rate of the impact kinetic energy to the battery pack 5.

[0028] Further, in some embodiments of the present application, the sill beam 1 is made of an alloy material. The alloy material has stronger strength and lighter weight. Under the requirement of the same mass, the sill beam 1 made of the alloy material has stronger strength and better anti-deformation ability. Of course, the selection of the sill beam 1 assembly and the auxiliary energy-absorbing support mechanism can also be more diversified. For example, high-strength steel (tensile strength within 800 MPa), ultra-high-strength steel (tensile strength above 1000 MPa), and composite materials (such as carbon fiber, density 1.5 g / cm3, much less than 7.85 g / cm3 of steel) can all effectively balance the collision requirements and weight needs.

[0029] Further, in some embodiments of the present application, the upper end and the lower end of the outer sill panel 2 are respectively fixedly connected to the sill beam 1. The middle part of the outer sill panel 2 is bent away from the sill beam 1 to form a first energy-absorbing cavity 201 between the outer sill panel 2 and the sill beam 1. Bending the outer sill panel 2 to form the first energy-absorbing cavity 201 improves the bending resistance of the sill assembly, and most of the impact kinetic energy is dissipated through the bending deformation of the sill assembly.

[0030] Further, in some embodiments of the present application, a sill reinforcement plate 3 is further included. The sill reinforcement plate 3 is disposed in the first energy-absorbing cavity 201. The upper end of the sill reinforcement plate 3 is fixed between the upper end of the outer sill panel 2 and the sill beam 1, and the lower half of the sill reinforcement plate 3 is fixed between the lower end of the outer sill panel 2 and the sill beam 1. The middle part of the sill reinforcement plate 3 is bent away from the sill beam 1, and there are gaps between the middle part of the sill reinforcement plate 3 and both the outer sill panel 2 and the sill beam 1. The setting of the sill reinforcement plate 3 improves the bending resistance of the sill assembly, thereby increasing the level of energy dissipation of the sill assembly.

[0031] Specifically, flanges are formed at both the lower end and the upper end of the outer sill panel 2 to facilitate fitting with the outer side surface of the sill beam 1. The cross-sectional shape of the sill reinforcement plate 3 is similar to that of the outer sill panel 2, and flanges are also respectively formed at the upper and lower ends of the sill reinforcement plate 3 to facilitate corresponding fitting and fixing with the outer side surface of the sill beam 1 and the outer sill panel 2. The outer sill panel 2, the sill reinforcement plate 3, and the sill beam 1 are fixed together by welding, which can significantly improve the bending resistance of the sill assembly.

[0032] Further, in some embodiments of the present application, a third energy-absorbing cavity is provided inside the battery frame 4. A second reinforcing rib plate 41 is provided in the third energy-absorbing cavity. The second reinforcing rib plate 41 is arranged horizontally, vertically, or obliquely. The third energy-absorbing cavity is provided inside the battery frame 4, enabling the battery frame 4 itself to have the function of crush energy absorption. As the last line of defense for the protection of the battery pack 5, the setting of the second reinforcing rib plate 41 is used to enhance the bending resistance of the battery frame 4 itself.

[0033] Further, in some embodiments of the present application, an L-shaped mating surface is formed on the outer side of the battery frame 4, the lower surface of the sill beam 1 overlaps on the L-shaped mating surface, and the lower surface of the sill beam 1 and the L-shaped mating surface are fixedly connected by a threaded fastener 8.

[0034] Specifically, the battery frame 4 includes a frame body and a connecting portion 42. The cross-sectional shape of the frame body is rectangular, and the interior of the frame body is hollow to form a third energy absorption cavity. The second reinforcing rib plate 41 is disposed inside the frame body to improve the bending resistance of the frame body; the connecting portion 42 is disposed on the side of the frame body away from the battery pack 5, and the upper surface of the connecting portion 42 and the outer side surface of the frame body together form an L-shaped mating surface. The lower surface of the sill beam 1 overlaps on the upper surface of the connecting portion 42. The cross-section of the connecting portion 42 is a triangular cavity, and a reinforcing rib plate can be disposed inside to enhance the bending resistance of the connecting portion 42. The strength of the connecting portion 42 is less than that of the frame body, so that when the vehicle is laterally impacted, the battery frame 4 can be disengaged from the sill beam 1 assembly, reducing the damage to the battery pack 5 caused by the impact.

[0035] Further, in some embodiments of the present application, the threaded fastener 8 sequentially passes through the outer side wall of the sill beam 1 and the outer side wall of the battery frame 4 to fixedly connect the sill beam 1 and the battery frame 4. Specifically, the sill beam 1 and the battery frame 4 are fixedly connected by rivets. On the basis of ensuring the installation strength, no structural reinforcement is performed on the connection position, so that when the sill assembly is subjected to a particularly large impact force, the battery frame 4 can be disengaged from the sill assembly, cutting off the transmission of the impact kinetic energy, and further improving the protection ability for the battery pack 5.

[0036] Further, in some embodiments of the present application, the Z-direction coincidence amount of the battery frame 4 and the sill beam 1 accounts for more than 50% of the total Z-direction height of the sill beam 1. The Z direction refers to the height direction of the vehicle, that is, in the height direction of the vehicle, at least 50% of the height of the sill beam 1 is used to abut and connect the battery frame 4. As Figure 1 shown, the top surface of the battery frame 4 reaches at least half of the height of the sill beam 1.

[0037] Further, in some embodiments of the present application, the floor structure 6 includes a front floor, a seat reinforcing longitudinal beam, and a seat front cross beam. The seat front cross beam, the seat front reinforcing longitudinal beam, and the outer sill side plate are all fixed on the upper surface of the front floor. The two ends of the seat front cross beam are respectively fixed on the sill beams 1 on both sides. The seat front reinforcing longitudinal beam connects a plurality of seat front cross beams together to form a whole to resist impact forces at different angles and achieve the dispersion of the impact kinetic energy.

[0038] The cross-section of the sill side support plate 7 is arranged in a Z shape, and one end of the sill side support plate 7 is fixed on the upper surface of the sill beam 1, and the other end is fixed on the seat front cross beam.

[0039] During the process of a vehicle collision, the sill beam 1 assembly outside the battery frame 4 is completely deformed, which can completely dissipate the collision kinetic energy and deform smoothly, ensuring that the lateral intrusion of the sill beam 1 assembly is small. At the same time, the floor structure 6 above the battery pack 5 can block the longitudinal intrusion, providing comprehensive protection for the battery pack 5 in both the longitudinal and transverse directions, and providing sufficient safety space for the occupants.

[0040] The sill assembly and the auxiliary energy-absorbing support mechanism of the vehicle battery pack 5 protection structure provided by the embodiments of the present application are made of high-strength materials, and energy-absorbing cavities are formed inside the sill beam 1, the outer sill panel 2, and the battery frame 4. On the basis of ensuring the structural strength, it has a better energy-absorbing effect. Therefore, the width of the crush energy-absorbing zone can be reduced compared with traditional vehicles. Thus, without changing the vehicle width, the space of the battery pack 5 can be increased, and a larger battery pack 5 can be arranged, improving the vehicle's cruising range.

[0041] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0042] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A protection structure for a vehicle battery pack, characterized in that, Comprising: A sill assembly and an auxiliary energy-absorbing support mechanism. The sill assembly includes an outer sill panel (2) and a sill beam (1). The outer sill panel (2) is disposed on the outer side of the end of the sill beam (1) and encloses a first energy-absorbing cavity (201) with the outer side surface of the sill beam (1). A second energy-absorbing cavity is provided inside the sill beam (1). Inside the second energy-absorbing cavity, there are a first transverse stiffening rib plate (10), a first longitudinal stiffening rib plate (12), and a first inclined stiffening rib plate (11). The first transverse stiffening rib plate (10) divides the second energy-absorbing cavity into an upper chamber (101) and a lower chamber (102). The first longitudinal stiffening rib plates (12) are distributed in the upper chamber (101) and the lower chamber (102). The first inclined stiffening rib plate (11) is inclined, and the upper end of the first inclined stiffening rib plate (11) is located inside the lower end. The auxiliary energy-absorbing support mechanism includes a sill side support plate (7), a battery frame (4), and a floor structure (6). The two ends of the sill side support plate (7) are respectively fixed on the upper surface of the sill beam (1) and the floor structure (6). The outer side of the battery frame (4) is fixedly connected to the sill beam (1).

2. The vehicle battery pack protection structure according to claim 1, wherein, The first inclined stiffening rib plate (11) is located inside the lower chamber (102), and the upper end of the first inclined stiffening rib plate (11) is connected to the first transverse stiffening rib plate (10).

3. The vehicle battery pack protection structure according to claim 1, wherein, The sill beam (1) is made of an alloy material.

4. The vehicle battery pack protection structure according to claim 1, wherein, The upper end and the lower end of the outer sill panel (2) are respectively fixedly connected to the sill beam (1). The middle part of the outer sill panel (2) bends away from the sill beam (1) to form the first energy-absorbing cavity (201) between the outer sill panel (2) and the sill beam (1).

5. The vehicle battery pack protection structure according to claim 4, wherein, It further includes a sill reinforcement plate (3). The sill reinforcement plate (3) is disposed inside the first energy-absorbing cavity (201). The upper end of the sill reinforcement plate (3) is fixed between the upper end of the outer sill panel (2) and the sill beam (1). The lower end of the sill reinforcement plate (3) is fixed between the lower end of the outer sill panel (2) and the sill beam (1). The middle part of the sill reinforcement plate (3) bends away from the sill beam (1), and there are gaps between the middle part of the sill reinforcement plate (3) and both the outer sill panel (2) and the sill beam (1).

6. The vehicle battery pack protection structure according to claim 1, wherein, A third energy-absorbing cavity is provided inside the battery frame (4). Inside the third energy-absorbing cavity, there is a second stiffening rib plate (41). The second stiffening rib plate (41) is arranged horizontally, vertically, or obliquely.

7. The vehicle battery pack protection structure according to claim 6, characterized in that, An L-shaped mating surface is formed on the outer side of the battery frame (4). The lower surface of the sill beam (1) is lapped on the L-shaped mating surface, and the lower surface of the sill beam (1) and the L-shaped mating surface are fixedly connected by a threaded fastener (8).

8. The vehicle battery pack protection structure according to claim 7, characterized in that, The threaded fastener (8) sequentially passes through the outer side wall of the sill beam (1) and the outer side wall of the battery frame (4) to fixedly connect the sill beam (1) and the battery frame (4).

9. The vehicle battery pack protection structure according to claim 1, characterized in that, The Z - direction coincidence amount of the battery frame (4) and the sill beam (1) accounts for more than 50% of the total Z - direction height of the sill beam (1).

10. The vehicle battery pack protection structure according to claim 1, characterized in that, The floor structure (6) includes a front floor, a front seat reinforcing longitudinal beam, and a front seat cross beam. The front seat cross beam, the front seat reinforcing longitudinal beam, and the sill side support plate (7) are all fixed on the upper surface of the front floor. Both ends of the front seat cross beam are respectively fixed on the sill beams (1) on both sides.

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