A battery pack mounting structure, a lower vehicle body, and a vehicle

Abstract

The utility model relates to a kind of battery pack mounting structure, automobile undercarriage and automobile, the battery pack mounting structure includes: battery pack and two door sill beams, two door sill beams are symmetrically arranged along vehicle center surface, and respectively extend along the direction of vehicle head;Battery pack is distributed between two door sill beams, and battery pack cantilever is fixedly installed to its two sides, and two battery pack cantilevers are distributed and are fixedly connected with two door sill beams;The side of battery pack is provided with the gap for avoiding exhaust pipe, and the length of battery pack cantilever on the side corresponding to the gap of battery pack is greater than the length of another battery pack cantilever.The utility model has the advantages of simple structure, low cost, good platform expandability, high generalization rate, more flexible and variable modeling.

Description

Technical Field

[0001] This utility model relates to the field of bicycle battery pack technology, specifically to a battery pack mounting structure, a car underbody, and a car. Background Technology

[0002] Hybrid electric vehicles (HEVs) are vehicles whose drive systems consist of two or more individual drive systems that can operate simultaneously. The vehicle's power output is provided individually or jointly by each individual drive system, depending on the actual driving conditions. HEVs generally refer to hybrid electric vehicles (HEVs), which use a traditional internal combustion engine (diesel or gasoline engine) and an electric motor as power sources. Some engines are modified to use alternative fuels, such as compressed natural gas, propane, and ethanol.

[0003] Current hybrid vehicles use a CTP (cell-to-pack) structure, where the battery pack has a complete casing and the vehicle body has a complete floor, with the two connected by bolts. This structure has the following drawbacks: 1. Structural redundancy: The battery pack is "suspended" under the floor and is not integrated. 2. Occupies the Z-axis space of the whole vehicle: There is a gap between the battery pack and the floor, and the floor itself also has thickness, which occupies the bandwidth of the Z-axis dimension chain of the whole vehicle. The Z-axis dimensions of the whole vehicle, such as ground clearance, battery pack thickness, passenger space, sunshade, roof shape, etc. are correspondingly limited.

[0004] 3. Small battery pack capacity: The vehicle components are not arranged compactly in the Y direction, which limits the width of the battery pack in the Y direction and makes it impossible to increase the capacity.

[0005] 4. Higher cost: There is material redundancy. The vehicle body and battery pack each have a separate, heavy aluminum alloy or steel cover, which increases the redundant material consumption and additional weight.

[0006] 5. Low platform commonality rate: It cannot share the floor with pure electric vehicles, especially pure electric vehicles with CTB structure (a technology that integrates battery cells directly into the body structure). Utility Model Content

[0007] This utility model addresses the technical problems existing in the prior art by providing a battery pack mounting structure, a car underbody, and a car.

[0008] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A battery pack mounting structure includes: a battery pack and two sill beams, the two sill beams being horizontally distributed relative to each other; the battery pack being distributed between the two sill beams, with battery pack cantilever arms fixedly mounted on both sides of the battery pack, the two battery pack cantilever arms being distributed and fixedly connected to the two sill beams; one side of the battery pack is provided with a clearance for avoiding an exhaust pipe, and the length of the battery pack cantilever arm on the side corresponding to the clearance is greater than the length of the other battery pack cantilever arm.

[0009] The beneficial effects of this utility model are: during the assembly process, the battery pack is fixedly connected to the two sill beams using two battery pack cantilever arms, which makes assembly convenient; In addition, a clearance is provided on one side of the battery pack to avoid the exhaust pipe. At the same time, the length of the battery pack cantilever on the corresponding side is greater than the length of the battery pack cantilever on the other side, which further effectively avoids the exhaust pipe and prevents the high-temperature gas emitted from the exhaust pipe from affecting the working performance of the battery pack, ensuring safety and reliability.

[0010] This utility model has the advantages of simple structure, low cost, good platform expandability, high versatility, and more flexible and varied shape.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, the two battery pack cantilever sections are fixedly connected to the two sill beams by multiple bolts.

[0013] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The two battery pack cantilever arms are fixedly connected to the two sill beams by multiple bolts, which makes assembly convenient and provides better stability.

[0014] Furthermore, the two battery pack cantilever arms are each in the form of a long strip plate structure, and the multiple bolts distributed on each battery pack cantilever arm are evenly spaced along their own length direction.

[0015] The advantages of adopting the above-mentioned further solution are that the structure is simple, the shape design of the two battery pack cantilever arms is reasonable, and it is easy to assemble the battery pack.

[0016] Furthermore, shock-absorbing buffers are installed on each of the bolts.

[0017] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. During use, the shock-absorbing buffer absorbs vibration energy and reduces the impact of impact tool vibration on the battery pack.

[0018] Furthermore, each of the shock-absorbing buffers includes two buffer pads, one of which is fitted onto the corresponding bolt and is located between the nut of the corresponding bolt and the sill beam; the other buffer pad is fitted onto the corresponding bolt and is located between the nut of the corresponding bolt and the battery pack cantilever.

[0019] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. It uses two buffer pads to reduce the impact between the bolt nut and the sill beam and between the bolt nut and the battery pack cantilever, respectively, absorb vibration energy, and reduce the impact of the impact tool vibration on the battery pack.

[0020] Furthermore, each of the shock-absorbing buffer components includes a buffer pad, a buffer sleeve, and a pressure ring. The buffer pad is sleeved on the corresponding bolt and is located between the nut of the corresponding bolt and the sill beam. The buffer sleeve and the pressure ring are respectively sleeved on the corresponding bolt, and the corresponding battery pack cantilever, the buffer sleeve, the pressure ring, and the nut of the corresponding bolt abut against each other in sequence.

[0021] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The buffer pad, buffer sleeve and pressure ring are used to reduce the impact between the bolt nut and the sill beam and between the bolt nut and the battery pack cantilever, respectively, absorb vibration energy and reduce the impact of the impact tool vibration on the battery pack.

[0022] Furthermore, the two threshold beams are respectively irregularly shaped cavity structures, which are distributed parallel to the cantilever of the two battery packs.

[0023] The advantages of adopting the above-mentioned further solutions are that the structure is simple, the shape design of the sill beam and the battery pack cantilever is reasonable, which facilitates assembly and saves space.

[0024] Furthermore, the battery pack has a rectangular shape.

[0025] The advantages of adopting the above-mentioned further solutions are that the structure is simple, the shape of the battery pack is reasonably designed, it is easy to assemble, and it saves space.

[0026] This utility model also relates to a vehicle lower body, including a lower body and an exhaust pipe, and further including the battery pack mounting structure as described above, wherein the two sill beams are fixedly mounted on the lower body; the exhaust pipe is mounted on the lower body and passes through the side of the battery pack corresponding to the clearance gap.

[0027] The beneficial effect of adopting the above-mentioned further solutions is that this utility model also relates to a car underbody, which has the advantages of simple structure, low cost, good platform expandability, high versatility, and more flexible and varied shape.

[0028] This utility model also relates to an automobile, including the automobile underbody as described above.

[0029] The beneficial effect of adopting the above-mentioned further solutions is that this utility model also relates to an automobile, which has the advantages of simple structure, low cost, good platform expandability, high versatility, and more flexible and varied styling. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the battery pack installation in this utility model; Figure 2 This is a front view of the battery pack installation in this utility model; Figure 3 This is a rear view of the battery pack installation in this utility model; Figure 4 This is a side view of the battery pack installation in this utility model; Figure 5 This is a schematic diagram of the first embodiment of the bolt in this utility model; Figure 6 This is a schematic diagram of the second embodiment of the bolt in this utility model; Figure 7 This is one of the structural schematic diagrams of the lower body of the automobile in this utility model; Figure 8 This is the second structural schematic diagram of the lower body of the automobile in this utility model; Figure 9 for Figure 8 Sectional view of AA; Figure 10 for Figure 9 Enlarged view of C; Figure 11 for Figure 8 A cross-sectional view of BB.

[0031] The attached diagram lists the components represented by each number as follows: 1. Battery pack; 2. Sill beam; 3. Battery pack cantilever; 4. Exhaust pipe; 5. Bolt; 6. Buffer pad; 7. Buffer sleeve; 8. Pressure ring; 9. Lower body; 10. Clearance. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0035] In the description of this application, spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., are used herein to describe the relationship between one element or feature shown in the figures and other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, an element or feature described as "below" or "under" or "below" of other elements or features will be oriented "above" other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein are interpreted accordingly.

[0036] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0037] Example 1 like Figures 1 to 6 As shown, this embodiment provides a battery pack mounting structure, including: a battery pack 1 and two sill beams 2, the two sill beams 2 being horizontally distributed relative to each other; the battery pack 1 is distributed between the two sill beams 2, and battery pack cantilever arms 3 are fixedly installed on both sides of it, the two battery pack cantilever arms 3 being distributed and fixedly connected to the two sill beams 2; one side of the battery pack 1 is provided with a clearance gap 10 for avoiding an exhaust pipe 4, and the length of the battery pack cantilever arm 3 on the side of the battery pack 1 corresponding to the clearance gap 10 is greater than the length of the other battery pack cantilever arm 3.

[0038] During assembly, battery pack 1 is fixedly connected to two sill beams 2 using two battery pack cantilever arms 3, which makes assembly convenient; In addition, a clearance 10 is provided on one side of the battery pack 1 to avoid the exhaust pipe. At the same time, the length of the battery pack cantilever 3 on the corresponding side of the battery pack 1 is greater than the length of the battery pack cantilever 3 on the other side, which further effectively avoids the exhaust pipe 4 and prevents the high temperature gas emitted from the exhaust pipe 4 from affecting the working performance of the battery pack 1, ensuring safety and reliability.

[0039] Preferably, in this embodiment, the clearance 10 is a triangular notch, which is reasonably designed and can effectively avoid the exhaust pipe 4.

[0040] The battery pack mounting structure includes a battery pack and sill beams. Vehicle sills are mounted on both sides of the vehicle body, and the battery pack is mounted on the sills. There are mounting structures at both ends of the battery pack. The vehicle's rear exhaust needs to pass through one side of the battery pack, therefore, space needs to be provided on one side of the battery pack for the exhaust pipe and for thermal clearance. Therefore, the y-direction length of the mounting structure on the side of the battery pack (where the exhaust pipe passes) is greater than the y-direction length on the other side.

[0041] Based on the above scheme, in order to avoid the exhaust pipe 4, a threshold beam 2 and a battery pack cantilever 3 of a certain strength are required. At this time, the required strength of the threshold beam 2 and the battery pack cantilever 3 is calculated by using relevant known parameters and formulas, so as to select threshold beam 2 and battery pack cantilever 3 of relevant materials, or select threshold beam 2 and battery pack cantilever 3 of different cross sections to ensure the stability of the entire battery pack assembly.

[0042] In addition, the two door sill beams 2 mentioned above are the left door sill beam and the right door sill beam, which are distributed opposite to each other along the left and right sides of the vehicle.

[0043] Taking sill beam 2 as an example, the following is the method for calculating the strength of sill beam 2 based on the stress: I. Benchmark Ratio Based on Force Analysis Given conditions: Force on the side of the short cantilever: F_short = k × (d + x) / (2d + x); Force on the side of a long cantilever: F_length = k × d / (2d + x); Force ratio: F_short / F_long = (d + x) / d; Taking d=80mm and x=190mm as an example: The theoretical force ratio = 270 / 80 = 3.375:1.

[0044] II. Stiffness Ratio Requirements 1. Connection stiffness ratio The target stiffness ratio is R_k = K_shorter / K_longer; The stress distribution requirement is met: 3.0:1~4.0:1; Recommended design value: 3.375:1 (precisely matching the force ratio).

[0045] 2. Bending stiffness ratio Based on the same material and the same cross-sectional area; Bending stiffness ratio = ratio of moment of inertia of cross sections 1 - shorter / longer; Required ratio: 3.2:1~3.8:1.

[0046] III. Strength Ratio Requirements 1. Allowable stress ratio Based on materials with the same yield strength Strength ratio = Section modulus ratio W_short / W_long; Required ratio: 2.8:1~3.5:1; Recommended design value: 3.2:1.

[0047] Based on the above calculations, the appropriate threshold beam 2 and battery pack cantilever 3 are selected.

[0048] This embodiment has the advantages of simple structure, low cost, good platform scalability, high versatility, and more flexible and varied design.

[0049] Example 2 Based on Example 1, in this example, the two battery pack cantilever arms 3 are fixedly connected to the two sill beams 2 by multiple bolts 5.

[0050] The scheme has a simple structure and reasonable design. The two battery pack cantilever arms 3 are fixedly connected to the two sill beams 2 by multiple bolts 5, which makes assembly convenient and provides good stability.

[0051] Alternatively, the two battery pack cantilever 3 segments and the two sill beams 2 can also be connected by other assembly methods, such as welding.

[0052] Example 3 Based on Embodiment 2, in this embodiment, the two battery pack cantilever arms 3 are respectively in the form of long strip plate structures, and the multiple bolts 5 distributed on each battery pack cantilever arm 3 are evenly spaced along their own length direction.

[0053] The design is simple, and the shape of the two battery pack cantilever arms 3 is reasonably designed, which facilitates the assembly of the battery pack 1.

[0054] Preferably, in this embodiment, the cross-section of each battery pack cantilever 3 is trapezoidal, which is not only aesthetically pleasing but also reduces the weight of the entire battery pack 1, thus achieving weight reduction.

[0055] Example 4 Based on any one of Embodiments 2 to 3, in this embodiment, shock-absorbing buffers are respectively installed on the plurality of bolts 5.

[0056] The solution has a simple structure and reasonable design. During use, it uses shock-absorbing buffers to absorb vibration energy and reduce the impact of impact tool vibration on battery pack 1.

[0057] Alternatively, shock absorbers may not be installed on the aforementioned bolts 5, but in this case, the battery pack 1 may vibrate during use.

[0058] Example 5 Based on Embodiment 4, in this embodiment, each of the shock-absorbing buffer components includes two buffer pads 6. One of the buffer pads 6 is sleeved on the corresponding bolt 5 and is located between the nut of the corresponding bolt 5 and the sill beam 2. The other buffer pad 6 is sleeved on the corresponding bolt 5 and is located between the nut of the corresponding bolt 5 and the battery pack cantilever 3.

[0059] The solution has a simple structure and reasonable design. It uses two buffer pads 6 to reduce the impact between the nut of bolt 5 and the sill beam 2 and between the nut of bolt 5 and the cantilever of battery pack 3, respectively, to absorb vibration energy and reduce the impact of the impact tool vibration on battery pack 1.

[0060] Preferably, in this embodiment, the two buffer pads 6 are respectively ring-shaped.

[0061] Alternatively, the two cushioning pads 6 mentioned above can also adopt other suitable geometries, such as rectangular frame structures.

[0062] Preferably, in this embodiment, the two buffer pads 6 are preferably rubber pads from the prior art, which have a better buffering effect and lower cost.

[0063] Example 6 Based on Embodiment 4, in this embodiment, each of the shock-absorbing buffer components includes a buffer pad 6, a buffer sleeve 7, and a pressure ring 8. The buffer pad 6 is sleeved on the corresponding bolt 5 and is located between the nut of the corresponding bolt 5 and the sill beam 2. The buffer sleeve 7 and the pressure ring 8 are respectively sleeved on the corresponding bolt 5, and the corresponding battery pack cantilever 3, the buffer sleeve 7, the pressure ring 8, and the nut of the corresponding bolt 5 abut against each other in sequence.

[0064] The scheme has a simple structure and reasonable design. It uses the buffer pad 6, the buffer sleeve 7 and the pressure ring 8 to reduce the impact between the nut of the bolt 5 and the sill beam 2 and between the nut of the bolt 5 and the cantilever of the battery pack 3, respectively, to absorb vibration energy and reduce the impact of the impact tool vibration on the battery pack 1.

[0065] Preferably, in this embodiment, the pressure ring 8 has a rectangular block structure and a pressure groove is provided on it.

[0066] Preferably, in this embodiment, the buffer sleeve 7 has an inverted T-shaped structure, with one end extending into the pressure groove.

[0067] Preferably, in this embodiment, the buffer sleeve 7 and the pressure ring 8 are made of elastic rubber material.

[0068] In addition, the center of the aforementioned buffer sleeve 7 and pressure ring 8 is provided with through holes for the bolt 5 to pass through.

[0069] The above-described embodiments 5 and 6 are parallel solutions, both of which can provide shock absorption and cushioning for the battery pack 1.

[0070] Example 7 Based on the above embodiments, in this embodiment, the two threshold beams 2 are respectively irregularly shaped cavity structures, which are distributed parallel to the two battery pack cantilever 3.

[0071] The design is simple, with reasonable shapes for the sill beam 2 and battery pack cantilever 3, which facilitates assembly and saves space.

[0072] Example 8 Based on the above embodiments, in this embodiment, the battery pack 1 has a rectangular body structure.

[0073] The solution has a simple structure, and the shape of the battery pack 1 is reasonably designed, which facilitates assembly and saves space.

[0074] Example 9 Based on the above embodiments, such as Figures 7 to 11As shown, this embodiment also provides a vehicle lower body, including a lower body 9 and an exhaust pipe 4, and also includes the battery pack mounting structure as described above. The two sill beams 2 are fixedly mounted on the lower body 9. The exhaust pipe 4 is mounted on the lower body 9 and passes through the battery pack 1 on one side corresponding to the clearance gap 10.

[0075] Preferably, in this embodiment, the exhaust pipe 4 adopts a bent pipe structure, which has a reasonable shape design, is easy to assemble, and avoids mutual interference with the battery pack 1.

[0076] Preferably, in this embodiment, the lower body 9 adopts a frame structure, which facilitates the assembly of various components, saves materials, and reduces costs.

[0077] This embodiment also relates to a vehicle underbody, which has the advantages of simple structure, low cost, good platform expandability, high versatility, and more flexible and varied shape.

[0078] Example 10 Based on the above embodiments, this embodiment also provides a car, including the car body as described above.

[0079] Based on the above scheme, in order to ensure the overall vehicle performance, the center of gravity of the entire battery pack needs to be set on the vehicle's central axis. To prevent uneven loading between the battery pack and the door sill, the door sill beam and connecting bolts on the side without the exhaust pipe will be reinforced, provided that the door sill cross-sectional areas are equal or approximately the same. Based on the lever arm lengths on both sides, in theoretical conditions, if the door sill material strength on the side with the exhaust pipe is 1, the door sill material strength on the side without the exhaust pipe is 3.4. If the fastening bolts on the side with the exhaust pipe are M8, 8.8 grade, then the fastening bolts on the side without the exhaust pipe are M12, 10.8 grade, to ensure the stability of the vehicle body structure.

[0080] This embodiment also relates to a car that has the advantages of simple structure, low cost, good platform scalability, high versatility, and more flexible and varied styling.

[0081] This utility model provides a battery pack mounting structure, a car underbody, and a car, the assembly principle of which is as follows: During assembly, the battery pack 1 is fixedly connected to the two sill beams 2 by two battery pack cantilever arms 3 and multiple bolts 5 evenly spaced on the two battery pack cantilever arms 3, which makes assembly convenient. In addition, a clearance 10 is provided on one side of the battery pack 1 to avoid the exhaust pipe. At the same time, the length of the battery pack cantilever 3 on the corresponding side of the battery pack 1 is greater than the length of the battery pack cantilever 3 on the other side, which further effectively avoids the exhaust pipe 4 and prevents the hot air emitted from the exhaust pipe 4 from affecting the working performance of the battery pack 1, ensuring safety and reliability.

[0082] The battery pack mounting structure, vehicle underbody, and vehicle provided by this utility model have the following advantages: 1. More flexible layout: The exhaust pipe is integrated with the side frame of the battery pack, allowing the battery pack to be made more regular in shape and with a larger effective volume.

[0083] 2. High degree of design freedom: The battery pack cover plate directly serves as the vehicle floor, maximizing the utilization of Z-axis space and allowing the vehicle body design to have a lower stance or a more spacious headroom in the passenger compartment.

[0084] 3. Greater platform versatility: Sedans, SUVs, and MPVs can share the same platform, and the size requirements of different models can be met by adjusting the wheelbase and battery pack.

[0085] 4. Standardized platform interfaces: The door sill beam, battery pack, fuel tank and exhaust pipe are modularly designed, allowing for the development of more vehicle models at a lower cost.

[0086] 5. Eliminate structural risks: Targeted reinforcement of the sill beam and connection points on the short cantilever side solves the problem of excessive regional stress and easy fatigue fracture.

[0087] 6. System weight reduction: By differentiating the design of the side thresholds and connectors, the system weight is reduced while meeting safety requirements.

[0088] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the above embodiments are merely exemplary embodiments or examples, and the scope of this utility model is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as the technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.

Claims

1. A battery pack mounting structure, characterized in that, include: A battery pack (1) and two sill beams (2) are arranged symmetrically along the center plane of the vehicle and extend along the front of the vehicle respectively. The battery pack (1) is distributed between the two sill beams (2) and battery pack cantilever arms (3) are fixedly installed on both sides of the battery pack. The two battery pack cantilever arms (3) are distributed and fixedly connected to the two sill beams (2). A clearance (10) for avoiding the exhaust pipe (4) is provided on one side of the battery pack (1), and the length of the battery pack cantilever arm (3) on the side of the battery pack (1) corresponding to the clearance (10) is greater than the length of the other battery pack cantilever arm (3).

2. The battery pack mounting structure according to claim 1, characterized in that, The two battery pack cantilever arms (3) are fixedly connected to the two sill beams (2) by multiple bolts (5).

3. The battery pack mounting structure according to claim 2, characterized in that, The two battery pack cantilever arms (3) are respectively in the form of long strip plate structures, and the multiple bolts (5) distributed on each battery pack cantilever arm (3) are evenly spaced along their own length direction.

4. The battery pack mounting structure according to claim 2, characterized in that, Shock-absorbing buffers are installed on each of the bolts (5).

5. The battery pack mounting structure according to claim 4, characterized in that, Each of the shock-absorbing buffers includes two buffer pads (6), one of which is fitted onto the corresponding bolt (5) and is located between the nut of the corresponding bolt (5) and the sill beam (2); the other buffer pad (6) is fitted onto the corresponding bolt (5) and is located between the nut of the corresponding bolt (5) and the battery pack cantilever (3).

6. The battery pack mounting structure according to claim 4, characterized in that, Each of the shock-absorbing buffer components includes a buffer pad (6), a buffer sleeve (7), and a pressure ring (8). The buffer pad (6) is fitted onto the corresponding bolt (5) and is located between the nut of the corresponding bolt (5) and the sill beam (2). The buffer sleeve (7) and the pressure ring (8) are respectively fitted onto the corresponding bolt (5), and the corresponding battery pack cantilever (3), the buffer sleeve (7), the pressure ring (8), and the nut of the corresponding bolt (5) abut against each other in sequence.

7. The battery pack mounting structure according to any one of claims 1-6, characterized in that, The two threshold beams (2) are respectively irregular cavity-like structures, which are distributed parallel to the two battery pack cantilever (3).

8. The battery pack mounting structure according to any one of claims 1-6, characterized in that, The battery pack (1) has a rectangular structure.

9. A vehicle lower body, comprising a lower body (9) and an exhaust pipe (4), characterized in that, It also includes the battery pack mounting structure as described in any one of claims 1-8, wherein the two sill beams (2) are fixedly mounted relative to each other on the lower body (9); the exhaust pipe (4) is mounted on the lower body (9) and passes through the side of the battery pack (1) corresponding to the clearance (10).

10. A car, characterized in that, Includes the vehicle underbody as described in claim 9.

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