Chassis assembly and vehicle

Abstract

The invention relates to the technical field of vehicle engineering, and discloses a chassis assembly and a vehicle. An exhaust pipe is installed at the bottom of a base plate, and an exhaust port of the exhaust pipe faces backwards; the wheels are mounted on the base plate and are spaced from the exhaust pipe in the left-right direction; the battery assembly is fixed to the base plate and located on the rear sides of the exhaust pipe and the wheels. A first fixing part of the protection piece is fixedly connected with the battery assembly, the first fixing part protrudes towards the ground side to form a containing cavity, and an anti-explosion valve of the battery assembly is located in the containing cavity; the second fixing part and the first fixing part are arranged at an interval in the front-back direction, and the second fixing part is fixed to the substrate; the first protection part is fixed to the first fixing part and the second fixing part, and the first protection part is located between the wheel and the battery assembly and partially located between the exhaust pipe and the wheel; and the second protection part is fixed with the first protection part, is bent towards one side of the substrate, and is positioned between the exhaust port and the battery assembly. Therefore, the battery can be protected against water, collision and high-temperature airflow baking.

Description

Technical Field

[0001] This invention relates to the field of vehicle engineering technology, and more particularly to a chassis assembly and a vehicle. Background Technology

[0002] With the increasing popularity and ownership of new energy vehicles, their safety has become a major social concern. As a core component, the power battery directly impacts the safety of the entire vehicle. Therefore, strengthening the protection of power batteries and avoiding fatal risks such as thermal runaway is of paramount importance for ensuring the safety of passengers and promoting the healthy development of the industry.

[0003] During daily driving, bumpy roads, potholes, and cracks can directly impact or scratch the battery casing or valves on the battery. When going over speed bumps, uphill, or on unpaved roads, the battery pack is one of the components most prone to bottoming out. Minor scratches may damage the coating, while severe collisions can cause the casing to deform or even crack. This front protective plate uses high-strength aluminum to effectively prevent direct damage to the battery pack body from impacts, bottoming out, or scratches, thus preventing potential problems.

[0004] In addition to physical impacts, water or other corrosive substances in the environment can also cause serious damage to the power battery system. For example, when driving through flooded areas in rainy weather, water ingress can cause short circuits in the internal wiring of the power battery, leading to serious malfunctions and even thermal runaway. Summary of the Invention

[0005] The purpose of this invention is to provide a chassis assembly and vehicle that can protect the battery from water, impact, and high-temperature airflow baking.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A chassis assembly, comprising:

[0008] substrate;

[0009] An exhaust pipe is mounted on the bottom of the substrate, with the exhaust port of the exhaust pipe facing rearward.

[0010] The wheels are mounted on the aforementioned base plate and are spaced apart from the aforementioned exhaust pipe in the left-right direction;

[0011] The battery assembly is fixed to the base plate and located behind the exhaust pipe and the wheel.

[0012] The protective component includes a first fixing part, a second fixing part, a first protective part, and a second protective part. The first fixing part is fixedly connected to the battery assembly and protrudes towards the ground to form a receiving cavity. The explosion-proof valve of the battery assembly is located within the receiving cavity. The second fixing part is spaced apart from the first fixing part in the front-rear direction and is fixed to the substrate. The first protective part is fixed to both the first and second fixing parts and is located between the wheel and the battery assembly, and partially between the exhaust pipe and the wheel. The second protective part is fixed to the first protective part, bends towards the substrate and extends towards the exhaust port, and is located between the exhaust port and the battery assembly.

[0013] As a preferred technical solution of the aforementioned chassis assembly, the aforementioned first fixing part is provided with a first light hole, and multiple first light holes are provided, arranged sequentially along the aforementioned left-right direction. The bracket of the aforementioned battery assembly is provided with multiple first threaded holes, arranged sequentially along the aforementioned left-right direction. The first threaded holes and the first light holes are coaxially corresponding one by one. The aforementioned first fixing part and the aforementioned battery assembly are connected by a first threaded fastener. The first threaded fastener is inserted into the aforementioned first light hole and then threadedly connected to the aforementioned first threaded hole.

[0014] As a preferred technical solution of the aforementioned chassis assembly, the aforementioned first fixing part is provided with positioning protrusions, and multiple positioning protrusions are provided, which are arranged sequentially along the aforementioned left-right direction. The aforementioned battery assembly is provided with positioning grooves, and multiple positioning grooves are provided, which are arranged sequentially along the aforementioned left-right direction. The positioning protrusions and the positioning grooves are inserted into each other in a one-to-one correspondence.

[0015] As a preferred technical solution of the aforementioned chassis assembly, the aforementioned first fixing part is provided with a first weight reduction hole, and multiple first weight reduction holes are provided, with the multiple first weight reduction holes arranged sequentially along the aforementioned left-right direction.

[0016] As a preferred technical solution of the aforementioned chassis assembly, the second fixing part is provided with a second optical hole, the substrate is provided with a second threaded hole, the second fixing part and the substrate are connected by a second threaded fastener, and the second threaded fastener is inserted into the second optical hole and then threadedly connected to the second threaded hole.

[0017] As a preferred technical solution for the aforementioned chassis assembly, the second fixing part is provided with a second weight reduction hole.

[0018] As a preferred technical solution for the aforementioned chassis assembly, the aforementioned first protective part is provided with reinforcing ribs along the aforementioned front-rear direction, and multiple reinforcing ribs are provided and are arranged at intervals along the left-right direction, and the reinforcing ribs extend along the front-rear direction.

[0019] As a preferred technical solution for the aforementioned chassis assembly, the aforementioned reinforcing rib is integrally formed with the aforementioned first protective part.

[0020] As a preferred technical solution for the aforementioned chassis assembly, the first protective part protrudes towards the ground side and is spaced apart from the aforementioned base plate.

[0021] A vehicle is also provided, including the aforementioned chassis assembly.

[0022] Beneficial effects of this invention:

[0023] This embodiment provides a chassis assembly including a base plate, an exhaust pipe, wheels, a battery assembly, and protective components. The base plate provides mounting support for the other structures. The exhaust pipe is mounted on the bottom of the base plate, with its exhaust port facing rearward. The wheels are mounted on the base plate and spaced apart from the exhaust pipe in the left-right direction. The battery assembly is fixed to the base plate and located behind the exhaust pipe and wheels. The protective components include a first fixing part, a second fixing part, a first protective part, and a second protective part. The first fixing part is fixed to the battery assembly and protrudes towards the ground to form a receiving cavity, within which the explosion-proof valve of the battery assembly is located. The second fixing part is spaced apart from the first fixing part in the front-rear direction and is fixed to the base plate. The first protective part is fixed to both the first and second fixing parts and is located between the wheels and the battery assembly, and partially between the exhaust pipe and the wheels. The second protective part is fixed to the first protective part, bends towards one side of the base plate, and extends towards the exhaust port, located between the exhaust port and the battery assembly.

[0024] The wheel is mounted on the base plate. When the vehicle is moving, the high-speed rotation of the wheel can easily pick up gravel from the ground. The picked-up gravel is thrown backward and diagonally upward along the tangential direction of the wheel. The first protective part is located between the battery assembly and the wheel. The picked-up gravel is intercepted by the first protective part to prevent damage to the battery assembly.

[0025] Furthermore, the high-speed rotation of the wheels can easily stir up water on the road surface. When the second fixing part is fixed to the base plate, the first fixing part and part of the base plate form a cavity. The front end of the battery assembly, namely the explosion-proof valve and part of the wiring harness interface, is inserted into the cavity. The cavity has a certain degree of airtightness, which can prevent water stains splashed from the road surface or other fluids from splashing onto the battery assembly, thereby ensuring the normal operation of the battery assembly and reducing the risk of short circuits.

[0026] Furthermore, the exhaust pipe is used to guide the harmful exhaust gases produced by the engine to the rear of the vehicle. Due to the high-temperature gas guided inside, the second protective part is inclined relative to the first protective part. The second protective part gradually approaches the substrate side from rear to front. The second protective part can block the hot airflow from passing through the battery. The second protective part forms a guide surface, which can guide the hot airflow blown towards the battery to the ground. When the temperature of the second protective part rises, it can transfer heat to the first protective part. The first protective part has a relatively large area and its heat dissipation efficiency is high. Attached Figure Description

[0027] Figure 1 This is a front view of the chassis assembly (excluding wheels) in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the chassis assembly (excluding wheels) in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the chassis assembly (excluding the base plate and exhaust pipe) in an embodiment of the present invention;

[0030] Figure 4 This is a front view of the protective component in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the protective component in an embodiment of the present invention.

[0032] In the picture:

[0033] 100. Ground; 110. Gravel;

[0034] X: forward / backward direction; Y: left / right direction;

[0035] 1. Substrate;

[0036] 2. Exhaust pipe;

[0037] 3. Wheels;

[0038] 4. Battery assembly;

[0039] 5. Protective component; 51. First fixing part; 51a. First light hole; 51b. First weight reduction hole; 51c. Positioning protrusion; 52. Second fixing part; 52a. Second light hole; 52b. Second weight reduction hole; 53. First protective part; 53a. Reinforcing rib; 54. Second protective part. Detailed Implementation

[0040] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0043] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0044] like Figures 1 to 5As shown, this embodiment provides a chassis assembly, which includes a base plate 1, an exhaust pipe 2, wheels 3, a battery pack 4, and protective components 5. The base plate 1 provides mounting support for the other structures. Exhaust pipe 2 is installed at the bottom of base plate 1, with the exhaust port of exhaust pipe 2 facing rearward; wheel 3 is installed on base plate 1 and is spaced apart from exhaust pipe 2 in the left-right direction Y; battery assembly 4 is fixed to base plate 1 and located behind exhaust pipe 2 and wheel 3; protective member 5 includes a first fixing part 51, a second fixing part 52, a first protective part 53 and a second protective part 54. The first fixing part 51 is fixed to battery assembly 4 and protrudes towards the ground 100 to form a receiving cavity. The explosion-proof valve of battery assembly 4 is located in the receiving cavity; the second fixing part 52 is spaced apart from the first fixing part 51 in the front-back direction X and is fixed to base plate 1; the first protective part 53 is fixed to the first fixing part 51 and the second fixing part 52 and is located between wheel 3 and battery assembly 4, and partly between exhaust pipe 2 and wheel 3; the second protective part 54 is fixed to the first protective part 53 and bends towards base plate 1 and extends towards the exhaust port, located between exhaust port and battery assembly 4.

[0045] For example, the wheel 3 is rotatably mounted on the base plate 1. When the vehicle is in motion, the high-speed rotation of the wheel 3 easily picks up gravel 110 from the ground 100. The picked-up gravel 110 flies backward and diagonally upward along the tangential direction of the wheel 3. Generally, the battery assembly 4 is installed at this position. After the battery is hit by the gravel 110, the anti-corrosion coating on its surface is easily damaged, and the exposed shell is easily corroded. The high-impact gravel 110 can squeeze the internal space of the battery pack, compressing the internal cells, modules, cooling pipes or wiring harnesses, and may even cause perforation damage. To this end, this application provides a first protective part 53, which is located between the battery assembly 4 and the wheel 3. The picked-up gravel 110 is intercepted by the first protective part 53 to prevent damage to the battery assembly 4.

[0046] Furthermore, the high-speed rotation of wheel 3 can easily stir up water on the road surface. When this water splashes onto the explosion-proof valve, impurities in the water or scale left after evaporation and drying may clog the pressure relief diaphragm of the explosion-proof valve or cause it to stick together. When the battery actually experiences thermal runaway and needs to release pressure, the explosion-proof valve cannot open normally, the internal pressure cannot be released, and the battery may experience a violent physical explosion. When water splashes into the explosion-proof valve of battery assembly 4, if the water enters the battery through the explosion-proof valve, the electrolyte inside the battery is extremely sensitive to moisture (especially lithium-ion batteries). Moisture will react with lithium salts (such as LiPF6) in the electrolyte to generate corrosive acids such as hydrogen fluoride. These acids will corrode the electrode materials and current collectors (copper foil / aluminum foil) of the battery cells, leading to permanent capacity decay, increased internal resistance, and severe performance degradation. Water ingress can cause short circuits, corrosion, and failure of electronic components, preventing the BMS from properly monitoring and controlling the battery status. The vehicle will be unable to drive or will report numerous fault codes. In severe cases, water may splash onto high-voltage cells, busbars, and connectors. This could lead to a severe short circuit outside the battery cell, generating a huge current and heat. To address this, this application provides a first fixing part 51. When the second fixing part 52 is fixed to the substrate 1, the first fixing part 51 and part of the substrate 1 form a receiving cavity. The front end of the battery assembly 4, namely the explosion-proof valve and part of the wiring harness interface, is inserted into the receiving cavity. The receiving cavity has a certain degree of airtightness, which can prevent water stains splashed from the road or other fluids from splashing onto the battery assembly 4, thereby ensuring the normal operation of the battery assembly 4 and reducing the risk of short circuits.

[0047] For example, exhaust pipe 2 is used to guide harmful exhaust gases produced by the engine to the rear of the vehicle. Due to the high-temperature gases guided inside, the surface temperature of exhaust pipe 2 is also relatively high. When the vehicle is moving, an airflow is generated flowing towards the rear of the vehicle. After passing through exhaust pipe 2, the airflow absorbs a large amount of heat, forming a hot airflow. The battery assembly 4 is installed behind exhaust pipe 2 and is constantly exposed to the heat of the hot airflow. The high temperature will accelerate the decomposition of active materials inside the battery and the consumption of electrolyte, resulting in a permanent decrease in the total amount of energy that the battery can store. Furthermore, at high temperatures, lithium-ion batteries will trigger a series of exothermic side reactions (such as SEI film decomposition, negative electrode reaction with electrolyte, etc.). These reactions will release more heat, causing the battery temperature to rise further, forming a vicious cycle. Once the accumulated heat cannot be dissipated in time, the battery temperature will rise sharply to over 500°C, causing the separator to melt, internal short circuit, and ultimately leading to serious accidents such as fire and explosion. Therefore, the protective component 5 is provided with a second protective part 54. The second protective part 54 is inclined relative to the first protective part 53. The second protective part 54 gradually approaches the substrate 1 from back to front. The second protective part 54 can block the hot airflow from passing through the battery. The second protective part 54 forms a guide surface, which can guide the hot airflow blowing towards the battery to the ground 100. When the temperature of the second protective part 54 rises, it can transfer heat to the first protective part 53. The first protective part 53 has a relatively large area and high heat dissipation efficiency.

[0048] Optionally, the first fixing part 51 has a first light hole 51a, and multiple first light holes 51a are provided. The multiple first light holes 51a are arranged sequentially along the left-right direction Y. The bracket of the battery assembly 4 has multiple first threaded holes, and the multiple first threaded holes are arranged sequentially along the left-right direction Y. The first threaded holes and the first light holes 51a are coaxially corresponding one by one. The first fixing part 51 and the battery assembly 4 are connected by a first threaded fastener. The first threaded fastener is inserted into the first light hole 51a and then threaded into the first threaded hole.

[0049] This design improves sealing performance, and the uniform sealing pressure ensures a consistent clamping force along the entire contact surface, preventing leaks caused by insufficient local pressure. This also prevents water accumulation on the road or other liquids from entering the accommodating cavity through the connection between the first fixing part 51 and the battery assembly 4, and potentially contacting the explosion-proof valve or other wiring harnesses of the battery assembly 4, thus preventing a short circuit.

[0050] Furthermore, it can significantly improve connection strength and load-bearing capacity. Specifically, when an external load is applied to the connection, the load is evenly or systematically distributed to multiple first threaded fasteners. Each first threaded fastener only needs to bear a small portion of the total load, thereby greatly increasing the total load that the entire connection structure can withstand. Moreover, because multiple first threaded fasteners disperse the concentrated force into multiple smaller forces, local stress peaks are effectively reduced, avoiding the high concentration of load around a certain first threaded hole and / or first smooth hole 51a, which could easily lead to crushing of the hole wall or tearing of the plate.

[0051] Furthermore, this solution enhances the reliability and security of the connection. Specifically, multiple first-threaded fasteners provide redundant backups. Even if one of the first-threaded fasteners fails due to manufacturing defects, installation errors, or accidental damage, the remaining first-threaded fasteners can still maintain the connection, preventing catastrophic sudden structural failure and greatly improving the system's safety factor.

[0052] Furthermore, during vehicle operation, the chassis often vibrates due to road conditions and other factors. In a vibrating environment, a single first-threaded fastener is prone to loosening and failure. Multiple first-threaded fasteners working together can better resist alternating loads caused by vibration, maintain the stability of the preload, and prevent the connection from loosening.

[0053] Furthermore, it can improve load distribution and reduce plate deformation. Specifically, the first threaded fastener generates a clamping force on the plate when tightened. Multiple first threaded fasteners are arranged in a straight line, so that the clamping force forms a uniform "pressure band" in the connection area. This effectively prevents the plate from warping or deforming under local high pressure, ensuring the flatness and stability of the connection.

[0054] Optionally, the first fixing part 51 is provided with positioning protrusions 51c, and multiple positioning protrusions 51c are provided. The multiple positioning protrusions 51c are arranged sequentially along the left-right direction Y. The battery assembly 4 is provided with positioning grooves, and multiple positioning grooves are arranged sequentially along the left-right direction Y. The positioning protrusions 51c and positioning grooves are inserted into each other in a one-to-one correspondence.

[0055] For example, the first fixing part 51 is provided with a positioning protrusion 51c, which protrudes towards the substrate 1, and the positioning groove of the battery assembly 4 is recessed towards the substrate 1. The positioning protrusion 51c is inserted into the positioning groove. In this way, the cooperation between the positioning protrusion 51c and the positioning groove can relatively strictly limit the degrees of freedom of the protective member 5 and the battery assembly 4 in the plane perpendicular to the installation direction, that is, the front-back direction X, the left-right direction Y, and the rotation direction around the vertical direction, ensuring that they can be guided to the only correct position each time. At this time, the first optical hole 51a and the first threaded hole can be coaxially aligned one-to-one, so that the first threaded fastener can be inserted and installed.

[0056] Furthermore, the positioning protrusion 51c is trapezoidal, preferably isosceles trapezoidal. The two waist surfaces of the positioning protrusion 51c form a guide surface, and the positioning groove is a corresponding trapezoidal shape, which facilitates the insertion and assembly of the positioning protrusion 51c and the positioning groove.

[0057] Optionally, the first fixing part 51 has a first weight reduction hole 51b, and multiple first weight reduction holes 51b are provided, and the multiple first weight reduction holes 51b are arranged sequentially along the left-right direction Y.

[0058] This design not only reduces the weight of the protective component 5 itself, but also reduces the load on the connectors between the protective component 5 and the substrate 1 and the battery assembly 4. Although the bending stiffness perpendicular to the hole array direction will decrease, the ligaments between these weight-reducing holes in the direction parallel to the hole array act as reinforcing ribs, which can improve the stability and buckling resistance of the protective component 5 in this direction to a certain extent.

[0059] Optionally, the second fixing part 52 has a second light hole 52a, the substrate 1 has a second threaded hole, the second fixing part 52 and the substrate 1 are connected by a second threaded fastener, the second threaded fastener is inserted into the second light hole 52a and then threaded into the second threaded hole.

[0060] The connection via threaded fasteners facilitates disassembly and reassembly between the second fixing part 52 and the base plate 1, and provides a certain degree of connection reliability.

[0061] Optionally, the second fixing part 52 has a second weight-reducing hole 52b. This configuration can reduce the weight of the protective member 5 and reduce the load on the connectors between the protective member 5 and the substrate 1 and the battery assembly 4.

[0062] Optionally, the first protective part 53 is provided with reinforcing ribs 53a along the front-rear direction X. Multiple reinforcing ribs 53a are provided and are arranged at intervals along the left-right direction Y. The reinforcing ribs 53a extend along the front-rear direction X.

[0063] This design enhances the structural strength of the first protective part 53. Specifically, the addition of the reinforcing rib 53a increases the moment of inertia of the section of the first protective part 53. Since bending stiffness is proportional to the moment of inertia, the stiffness of the first protective part 53 is enhanced, making it less prone to deformation or damage when colliding with splashed stones or other foreign objects.

[0064] Furthermore, the reinforcing rib 53a can serve as a force transmission path, more effectively distributing the concentrated load borne locally to the entire first protective part 53, thus avoiding excessive local stress.

[0065] Optionally, the reinforcing rib 53a is integrally formed with the first protective part 53. This arrangement facilitates manufacturing and reduces subsequent assembly.

[0066] Optionally, the first protective part 53 protrudes towards the ground 100 and is spaced apart from the substrate 1. With this arrangement, the first protective part 53 and the substrate 1 are spaced apart, forming a buffer cavity between them. When the first protective part 53 is impacted by a foreign object, the first protective part 53 can absorb the impact force through its own vibration and no longer transmit the force to the substrate 1.

[0067] A vehicle is also provided, including the aforementioned chassis assembly.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A chassis assembly, characterized in that, include: base(1); An exhaust pipe (2) is installed at the bottom of the substrate (1), and the exhaust port of the exhaust pipe (2) faces rearward. The wheel (3) is mounted on the base plate (1) and is spaced apart from the exhaust pipe (2) in the left-right direction (Y); The battery assembly (4) is fixed to the base plate (1) and located behind the exhaust pipe (2) and the wheel (3); The protective component (5) includes a first fixing part (51), a second fixing part (52), a first protective part (53), and a second protective part (54). The first fixing part (51) is fixedly connected to the battery assembly (4) and protrudes towards the ground (100) to form a receiving cavity. The explosion-proof valve of the battery assembly (4) is located in the receiving cavity. The second fixing part (52) is spaced apart from the first fixing part (51) in the front-rear direction (X). The second fixing part (52) is connected to the substrate (1). Fixed; the first protective part (53) is fixed to the first fixed part (51) and the second fixed part (52), the first protective part (53) is located between the wheel (3) and the battery assembly (4), and is partially located between the exhaust pipe (2) and the wheel (3); the second protective part (54) is fixed to the first protective part (53), the second protective part (54) bends toward the substrate (1) and extends toward the exhaust port, and is located between the exhaust port and the battery assembly (4).

2. The chassis assembly according to claim 1, characterized in that, The first fixing part (51) has a first light hole (51a), and multiple first light holes (51a) are provided. The multiple first light holes (51a) are arranged sequentially along the left-right direction (Y). The bracket of the battery assembly (4) has multiple first threaded holes, and the multiple first threaded holes are arranged sequentially along the left-right direction (Y). The first threaded holes and the first light holes (51a) are coaxially corresponding one by one. The first fixing part (51) and the battery assembly (4) are connected by a first threaded fastener. The first threaded fastener is inserted into the first light hole (51a) and then threaded into the first threaded hole.

3. The chassis assembly according to claim 1, characterized in that, The first fixing part (51) is provided with a positioning protrusion (51c), and there are multiple positioning protrusions (51c). The multiple positioning protrusions (51c) are arranged sequentially along the left-right direction (Y). The battery assembly (4) is provided with a positioning groove, and there are multiple positioning grooves. The multiple positioning grooves are arranged sequentially along the left-right direction (Y). The positioning protrusions (51c) and the positioning grooves are inserted into each other in a one-to-one correspondence.

4. The chassis assembly according to claim 1, characterized in that, The first fixing part (51) has a first weight reduction hole (51b), and multiple first weight reduction holes (51b) are provided. The multiple first weight reduction holes (51b) are arranged sequentially along the left-right direction (Y).

5. The chassis assembly according to claim 1, characterized in that, The second fixing part (52) has a second light hole (52a), and the substrate (1) has a second threaded hole. The second fixing part (52) and the substrate (1) are connected by a second threaded fastener. The second threaded fastener is inserted into the second light hole (52a) and then threaded into the second threaded hole.

6. The chassis assembly according to claim 1, characterized in that, The second fixing part (52) has a second weight reduction hole (52b).

7. The chassis assembly according to claim 1, characterized in that, The first protective part (53) is provided with reinforcing ribs (53a) along the front-rear direction (X). There are multiple reinforcing ribs (53a) and they are arranged at intervals along the left-right direction (Y). The reinforcing ribs (53a) extend along the front-rear direction (X).

8. The chassis assembly according to claim 7, characterized in that, The reinforcing rib (53a) is integrally formed with the first protective part (53).

9. The chassis assembly according to claim 1, characterized in that, The first protective part (53) protrudes towards the ground (100) and is spaced apart from the substrate (1).

10. A vehicle, characterized in that, Includes the chassis assembly as described in any one of claims 1-9.

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