Mobile skid plate devices, chassis systems, vehicle and chassis skid plate control methods

Abstract

This disclosure provides a movable skid plate device, chassis system, vehicle, and chassis skid plate control method, relating to the field of vehicle chassis technology. The device includes a skid plate guide rail and a movable skid plate. The movable skid plate includes a skid plate body and a drive mechanism connected to the skid plate body. The movable skid plate is slidably mounted on the skid plate guide rail via the drive mechanism and is installed below the vehicle's power battery pack assembly via the skid plate guide rail. The drive mechanism is used to drive the skid plate body to move on the skid plate guide rail, thereby changing the shielding state of the power battery pack assembly. This disclosure can reduce the overall vehicle drag while avoiding overheating of the new energy system.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle chassis technology, specifically to a mobile skid plate device, chassis system, vehicle, and a method for controlling the skid plate. Background Technology

[0002] Hybrid electric vehicles (HEVs), distinct from gasoline-powered and pure electric vehicles, combine the engine, intake, exhaust, and fuel supply systems of gasoline vehicles with the electric drive, battery, and high-voltage charging and discharging systems of pure electric vehicles. They also feature a transmission and generator unique to hybrid systems. The chassis design of HEVs needs to accommodate both the exhaust system and the new energy system. However, this compatibility design places the exhaust system and the new energy system close together, potentially leading to overheating risks in components of the new energy system such as the battery casing, high-voltage wiring harness, and battery explosion-proof valve. Summary of the Invention

[0003] To address the problems existing in the prior art, this disclosure provides a mobile skid plate device, a chassis system, a vehicle, and a method for controlling the chassis skid plate, which can reduce the overall vehicle's wind resistance while preventing overheating of the new energy system. The technical solution is as follows:

[0004] In a first aspect, a movable guard plate device is provided, including a guard plate guide rail and a movable guard plate. The movable guard plate includes a guard plate body and a drive mechanism connected to the guard plate body. The movable guard plate is slidably disposed on the guard plate guide rail via the drive mechanism and is installed below the power battery pack assembly of a vehicle via the guard plate guide rail. The drive mechanism is used to drive the guard plate body to move on the guard plate guide rail, thereby changing the shielding state of the power battery pack assembly.

[0005] In one possible implementation, the driving mechanism includes a driving device, a connecting shaft, and a roller. The driving device is connected to the connecting shaft and is used to drive the connecting shaft to rotate. The end of the connecting shaft away from the driving device is connected to the roller, and the roller is located inside the guard plate guide rail. There is also a driving wheel ball between the roller and the guard plate guide rail.

[0006] Secondly, a chassis system is provided, including a fixed front chassis guard plate, a fixed rear chassis guard plate, a power battery pack assembly, and a movable guard plate device provided in the first aspect; the fixed front chassis guard plate is fixedly installed under the front axle of the vehicle, the fixed rear chassis guard plate is fixedly installed under the rear axle of the vehicle, the power battery pack assembly is located between the front axle and the rear axle, and the movable guard plate device is installed below the power battery pack assembly; a drive mechanism for the movable guard plate device is used to drive the movable guard plate to move between a first position and a second position, wherein when the movable guard plate is in the first position, the guard plate body of the movable guard plate is engaged with the fixed front chassis guard plate, and when the movable guard plate is in the second position, the guard plate body of the movable guard plate is engaged with the fixed rear chassis guard plate.

[0007] In one possible implementation, the movable guard plate device has a first limiting block and a second limiting block on the guard plate guide rail. When the movable guard plate is in the first position, the driving mechanism of the movable guard plate contacts the first limiting block, and when the movable guard plate is in the second position, the driving mechanism of the movable guard plate contacts the second limiting block.

[0008] In one possible implementation, when the movable guard plate is in the second position, the guard plate body does not obstruct the explosion-proof valve of the power battery pack assembly and the high-voltage wiring harness connected to the power battery pack assembly.

[0009] In one possible implementation, a domain controller and a temperature sensor connected to the domain controller are also included. The domain controller is also connected to a drive mechanism of the movable guard plate device to control the drive mechanism to adjust the position of the movable guard plate based on the temperature signal collected by the temperature sensor.

[0010] In one possible implementation, the temperature sensor includes a power battery pack assembly side temperature sensor, a power battery pack assembly front temperature sensor, a power battery two-phase cable harness temperature sensor, a power battery explosion-proof valve temperature sensor, and a BMS temperature sensor.

[0011] Thirdly, a vehicle is provided, the vehicle including a chassis system provided in the second aspect.

[0012] Fourthly, based on the chassis system provided in the second aspect, or the vehicle provided in the third aspect, a chassis skid plate control method is further provided, including:

[0013] Obtain power battery temperature data;

[0014] Based on the power battery temperature data, adjust the movable guard plate device; if the power battery temperature data is greater than a set threshold, control the movable guard plate device to move to the second position; otherwise, control the movable guard plate device to move to the first position.

[0015] In one possible implementation, the power battery temperature data includes the power battery pack assembly side temperature, the power battery pack assembly front temperature, the power battery two-phase cable harness temperature, the power battery explosion-proof valve temperature, and the BMS temperature; if the power battery pack assembly side temperature is greater than a first temperature threshold, or the power battery pack assembly front temperature is greater than a second temperature threshold, or the power battery two-phase cable harness temperature is greater than a third temperature threshold, or the power battery explosion-proof valve temperature is greater than a fourth temperature threshold, or the BMS temperature is greater than a fifth temperature threshold, the movable guard plate device is controlled to move to the second position.

[0016] The beneficial effects of the technical solutions provided in this disclosure are:

[0017] This disclosure provides a movable protective plate device, a chassis system, a vehicle, and a chassis protective plate control method. A movable protective plate device is provided below the power battery pack assembly. The protective plate body can flexibly change the shielding state of the power battery pack assembly according to temperature requirements, thereby avoiding overheating problems of structures in the new energy system such as battery casing, battery high-voltage wiring harness, and battery explosion-proof valve at the chassis, and improving the durability and reliability of related structures.

[0018] The vehicle chassis is equipped with a fixed front underbody skid plate located under the front axle, a fixed rear underbody skid plate located under the rear axle, and a movable skid plate located under the power battery pack assembly. When heat dissipation is not required, or when the battery pack and other structures require heating at low temperatures, the movable skid plate is integrated with the fixed front underbody skid plate. The hot airflow from the front engine compartment, after flowing to the front underbody skid plate, can be diverted to the battery pack and high-voltage wiring harness through the skid plate, thus preheating the battery pack and wiring harness at low temperatures. At the same time, the skid plate also provides insulation, prevents foreign objects from bumping into the battery and high-voltage wiring harness, and reduces the overall vehicle drag. When heat dissipation is required, the skid plate is integrated with the fixed rear underbody skid plate. In this case, the hot airflow from the front engine compartment, after flowing to the front underbody skid plate, can flow to the outside of the chassis, preventing hot air from heating the power battery pack, high-voltage wiring harness, battery explosion-proof valve, and other structures. At the same time, low-temperature air from the external environment can flow to the heat sources such as the battery pack, high-voltage wiring harness, and battery explosion-proof valve for cooling.

[0019] The guard plate guide rail is installed below the power battery pack assembly. In addition to providing guidance, it can also play a role in the transmission of collision force. When the vehicle is involved in a frontal collision, the collision force can be transmitted and dispersed to the rear through the guard plate guide rail, thereby improving the overall safety of the vehicle body.

[0020] Advantages of this disclosure in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a chassis system provided in an embodiment of this disclosure;

[0023] Figure 2 This is a schematic diagram of a chassis system provided in this disclosure when the movable guard plate is in the first position;

[0024] Figure 3 This is a schematic diagram of a chassis system provided in this disclosure when the movable guard plate is in the second position;

[0025] Figure 4 This is a schematic diagram illustrating the cooperation relationship between the guard plate guide rail and the movable guard plate in a movable guard plate device provided in an embodiment of this disclosure;

[0026] Figure 5 This is a schematic diagram of the control logic of a chassis guard plate control method provided in an embodiment of this disclosure.

[0027] The reference numerals in the attached diagram represent: 1. Engine; 2. Hybrid power transmission; 3. Two-phase cable harness for power battery; 4. Power battery explosion-proof valve; 5. Power battery pack assembly; 6. Guard plate guide rail; 7. Drive mechanism; 701. Drive unit; 702. Connecting shaft; 703. Roller; 704. Drive wheel ball bearing; 8. Guide rail fixing bolt; 9. Guard plate body; 901. Guard plate fixing bolt; 10. Fuel tank assembly; 11. Drive motor assembly; 12. Rear muffler assembly. ; 13. Precatalytic converter assembly and front muffler assembly; 14. Side temperature sensor of power battery pack assembly; 15. Front temperature sensor of power battery pack assembly; 16. Temperature sensor of power battery two-phase cable harness; 17. Temperature sensor of power battery explosion-proof valve; 18. BMS temperature sensor; 19. Domain controller; 20. Fixed chassis front guard plate; 21. Fixed chassis rear guard plate; 22. First limit block; 23. Second limit block; 24. Front floor body of vehicle body. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0029] The terms "first," "second," etc., in this disclosure, claim, and drawings are used to distinguish different objects, not to describe a specific order. Terms indicating orientation, such as "upper" and "lower," are used to describe the relative positional relationship of the structural parts in their normal operating state and do not necessarily limit the orientation. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0030] This disclosure first provides a movable guard plate device, such as... Figure 1 , Figure 4 As shown, it includes a guard plate guide rail 6 and a movable guard plate. The movable guard plate includes a guard plate body 9 and a drive mechanism 7 connected to the guard plate body 9. The movable guard plate is slidably mounted on the guard plate guide rail 6 through the drive mechanism 7 and is installed below the power battery pack assembly 5 of the vehicle through the guard plate guide rail 6. The drive mechanism 7 is used to drive the guard plate body 9 to move on the guard plate guide rail 6, thereby changing the shielding state of the power battery pack assembly 5.

[0031] Because hybrid electric vehicles need to be compatible with the engine and exhaust system of traditional gasoline vehicles, as well as the battery and high-voltage wiring harness of electric vehicles, and because the battery, wiring harness, and other structures are integrated with the exhaust system in the chassis, there may be potential high-temperature risks, thereby reducing the durability and reliability of each component. Meanwhile, the driving range and wind resistance of new energy vehicles are already important technical parameters that major OEMs focus on when developing vehicles. To meet the normal operating requirements of the battery connection high-voltage wiring harness, battery explosion-proof valve, battery casing, etc., reduce the temperature of these components, improve their durability and reliability, and simultaneously reduce wind resistance to improve driving range, this disclosure first provides a movable protective plate device. A movable protective plate device is installed below the power battery pack assembly. This device can flexibly change the shielding state of the protective plate body on the power battery pack assembly according to actual wind resistance, temperature, and other requirements, thereby preventing overheating problems of the battery casing, battery high-voltage wiring harness, battery explosion-proof valve, and other structures in the new energy system at the chassis, and improving the durability and reliability of these structures.

[0032] The drive mechanism 7 includes a drive unit 701, a connecting shaft 702, and rollers 703. The drive unit 701 is connected to the connecting shaft 702 and can be a drive motor or a drive motor with a reducer, etc., to drive the connecting shaft 702 to rotate. A roller 703 is connected to the end of the connecting shaft 702 away from the drive unit 701, and the roller 703 is located within the guard plate guide rail 6. To ensure smooth driving, the guard plate guide rail 6 is designed with two parallel guide rails. Therefore, the drive mechanism has two connecting shafts 702 and two rollers 703. The drive unit is located between the two guide rails, with one connecting shaft 702 symmetrically arranged on each side. Each connecting shaft 702 has a roller 703 connected to its end. A drive wheel ball bearing 704 is also located between the roller 703 and the guard plate guide rail 6. The drive wheel ball bearing guides the linear motion of the drive mechanism, makes the system run more smoothly, and helps maintain system stability when the drive mechanism stops.

[0033] The guard plate body 9 is fixed to the lower part of the drive unit 701 by the guard plate fixing bolt 901. The guard plate guide rail 6 is fixedly installed at the lower part of the power battery pack assembly 5 by the guide rail fixing bolt 8, and the guide rail fixing bolt 8 also passes through the front floor body 24 of the vehicle body at the upper part of the power battery pack assembly 5, thereby fixing the power battery pack assembly 5, the guard plate guide rail 6 and the vehicle body together.

[0034] In addition, installing the guard plate guide rail under the power battery pack assembly can also play a role in the transmission of collision force. When the vehicle is involved in a frontal collision, the collision force can be transmitted and dispersed to the rear through the guard plate guide rail, thereby improving the overall safety of the vehicle body.

[0035] This disclosure further provides a chassis system, see [link to relevant documentation] Figures 1-3 The system includes a fixed front chassis guard plate 20, a fixed rear chassis guard plate 21, a power battery pack assembly 5, and a movable guard plate device provided above. The fixed front chassis guard plate 20 is fixedly installed under the front axle of the vehicle, the fixed rear chassis guard plate 21 is fixedly installed under the rear axle of the vehicle, the power battery pack assembly 5 is located between the front and rear axles, and the movable guard plate device is located below the power battery pack assembly 5. The drive mechanism of the movable guard plate device is used to drive the movable guard plate to move between a first position and a second position. When the movable guard plate is in the first position, the guard plate body 9 of the movable guard plate is engaged with the fixed front chassis guard plate 20. When the movable guard plate is in the second position, the guard plate body 9 of the movable guard plate is engaged with the fixed rear chassis guard plate 21.

[0036] The fixed chassis front skid plate 20 is located below the front axle and serves to protect the superstructure. Above the fixed chassis front skid plate 20, in addition to the front axle, the vehicle's powertrain system is also arranged, including the engine 1, the dedicated hybrid transmission 2 (DHT), the pre-catalytic converter assembly and the front muffler assembly 13 connected to the engine 1, and the two-phase power battery cable harness 3 connected to the dedicated hybrid transmission 2. The rear ends of the pre-catalytic converter assembly and the front muffler assembly 13 are connected to the rear muffler assembly 12 located at the rear axle, and the rear ends of the two-phase power battery cable harness 3 are connected to the power battery pack assembly 5.

[0037] The fixed chassis rear skid plate 21 is located below the rear axle and serves to protect the superstructure. Above the fixed chassis rear skid plate 21, in addition to the rear axle, are the vehicle's fuel tank assembly 10, drive motor assembly 11 (preferably a six-in-one drive motor assembly), and rear muffler assembly 12.

[0038] The fixed chassis front guard plate 20, the fixed chassis rear guard plate 21, and the guard plate body 9 together constitute the guard plate structure of the lower part of the chassis system. The fixed chassis front guard plate 20 and the fixed chassis rear guard plate 21 are fixed, while the guard plate body 9 is movable, so that the overall air flow direction of the chassis can be changed by flexibly adjusting the position of the guard plate body 9. Figures 2-3 The direction indicated by the middle arrow is the direction of the hot airflow in the forward cabin. The state in which the movable skid plate is in the first position and the skid plate body 9 is combined with the fixed chassis front skid plate 20 is called the closed state of the movable skid plate device. The state in which the movable skid plate is in the second position and the skid plate body 9 is combined with the fixed chassis rear skid plate 21 is called the open state of the movable skid plate device.

[0039] In the closed state, the movable skid plate device is assembled with the fixed chassis front skid plate. After the hot airflow from the front engine compartment flows to the front chassis skid plate, it can be guided to the battery pack and high-voltage wiring harness through the skid plate body. At this time, the battery pack and high-voltage wiring harness will be heated by the hot airflow. This state is suitable for situations where the battery pack and high-voltage wiring harness are not overheated. The skid plate body can also prevent foreign objects from hitting the battery and high-voltage wiring harness, as well as reduce the overall vehicle wind resistance. In addition, when the ambient temperature is low, it can also preheat the battery pack and high-voltage wiring harness.

[0040] In the open state, the movable skid plate unit is assembled with the fixed rear chassis skid plate. This configuration is suitable for situations where structures such as the battery pack and high-voltage wiring harness overheat. At this time, the hot airflow from the front engine compartment, after reaching the front chassis skid plate, can flow to the outside of the chassis through the gap between the skid plate and the skid plate unit. This prevents the hot air from heating the power battery pack, high-voltage wiring harness, battery explosion-proof valve, and other structures. Simultaneously, cooler air from the external environment can flow to the heat sources such as the battery pack, high-voltage wiring harness, and battery explosion-proof valve for cooling.

[0041] In one possible implementation, the guide rail 6 of the movable guard plate device has a first limiting block 22 and a second limiting block 23. When the movable guard plate is in the first position, the roller 703 of the drive mechanism of the movable guard plate contacts the first limiting block 22. When the movable guard plate is in the second position, the roller 703 of the drive mechanism of the movable guard plate contacts the second limiting block 23.

[0042] In one possible implementation, when the movable guard plate is in the second position, the guard plate body 9 of the movable guard plate does not obstruct the power battery explosion-proof valve 4 of the power battery pack assembly and the power battery two-phase cable harness 3 connected to the power battery pack assembly, so that the incoming external airflow can dissipate heat from the above-mentioned components.

[0043] In one possible implementation, temperature data is collected from the locations of relevant components of the power battery pack to determine if there is an overheating risk, thereby enabling dynamic and flexible adjustment of the movable protective plate based on the temperature. In this case, a domain controller is required for data processing and control. Temperature sensors are installed at the locations where temperature data needs to be collected. The domain controller 19 is connected to each temperature sensor and also to the drive mechanism of the movable protective plate device. Based on the temperature signals collected by the temperature sensors, the domain controller controls the drive mechanism to adjust the position of the movable protective plate.

[0044] The temperature sensors include a power battery pack assembly side-end temperature sensor 14 located on the side of the power battery pack assembly, a power battery pack assembly front-end temperature sensor 15 located at the front of the power battery pack assembly, a power battery two-phase cable harness temperature sensor 16 located at the connection between the power battery pack assembly and the power battery two-phase cable harness, a power battery explosion-proof valve temperature sensor 17 located at the power battery explosion-proof valve, and a BMS temperature sensor 18 located at the Battery Management System (BMS). These sensors are used to collect the power battery pack assembly side-end temperature T1, the power battery pack assembly front-end temperature T2, the power battery two-phase cable harness temperature T3, the power battery explosion-proof valve temperature T4, and the BMS temperature T5, respectively.

[0045] This disclosure also provides a vehicle that includes the chassis system described above. The specific implementation of this vehicle is the same as that of the chassis system described above, and will not be repeated here.

[0046] Based on the chassis system or vehicle provided above, this disclosure further provides a chassis underbody control method, including:

[0047] Obtain power battery temperature data;

[0048] Based on the power battery temperature data, adjust the movable guard plate device; if the power battery temperature data is greater than a set threshold, control the movable guard plate device to move to the second position; otherwise, control the movable guard plate device to move to the first position.

[0049] The power battery temperature data includes the side temperature of the power battery pack assembly, the front temperature of the power battery pack assembly, the temperature of the two-phase cable harness of the power battery, the temperature of the power battery explosion-proof valve, and the BMS temperature. If the side temperature of the power battery pack assembly T1 is greater than the first temperature threshold, or the front temperature of the power battery pack assembly T2 is greater than the second temperature threshold, or the temperature of the two-phase cable harness of the power battery T3 is greater than the third temperature threshold, or the temperature of the power battery explosion-proof valve T4 is greater than the fourth temperature threshold, or the BMS temperature T5 is greater than the fifth temperature threshold, the movable guard plate device is controlled to move to the second position.

[0050] The chassis skid plate control method is executed by a domain controller. The domain controller collects temperature values ​​T1-T5 and calculates the opening or closing control signal through a calibrated logic control strategy. When the domain controller issues a closing signal, the drive mechanism receives the closing command from the domain controller and confirms the current open / closed state of the movable skid plate through a position sensor. If it is in the closed state, no action is taken; if it is in the open state, the drive device drives the rotating shaft and rollers to roll on the skid plate guide rail, moving the skid plate body linearly towards the front of the vehicle to the position of the first limit block, at which point the motor stops working, completing the closing action.

[0051] When the domain controller sends an open signal, the drive mechanism receives the open command from the domain controller and confirms the current open / closed state of the movable guard plate through the position sensor. If it is in the open state, no action is taken; if it is in the closed state, the drive device drives the rotating shaft and rollers to roll on the guard plate guide rail, driving the guard plate body to move in a straight line towards the rear of the vehicle to the position of the second limit block, at which point the motor stops working, completing the opening action.

[0052] The logical control policies defined within the domain controller, such as Figure 5 As shown, it includes:

[0053] The temperature T1 at the measuring end of the power battery pack is collected. If T1 > 65℃ (which can be calibrated), an open signal is issued.

[0054] The front-end temperature T2 of the power battery pack assembly is collected. If T2 > 80℃ (calibrable), an open signal is issued.

[0055] The temperature T3 of the two-phase cable harness of the power battery is collected. If T3 > 110℃ (which can be calibrated), an open signal is issued.

[0056] Collect the temperature T4 of the power battery explosion-proof valve. If T4 > 70℃ (can be calibrated), issue an opening signal.

[0057] Collect the BMS temperature T5. If T5 > 45℃ (calibrable), issue an open signal.

[0058] If none of the above conditions are met, a shutdown signal will be issued.

[0059] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A chassis system, characterized in that, The system includes a fixed front chassis guard plate, a fixed rear chassis guard plate, a power battery pack assembly, and a movable guard plate device. The fixed front chassis guard plate is fixedly installed under the front axle of the vehicle, the fixed rear chassis guard plate is fixedly installed under the rear axle of the vehicle, the power battery pack assembly is located between the front and rear axles, and the movable guard plate device is located below the power battery pack assembly. A drive mechanism for the movable guard plate device is used to move the movable guard plate between a first position and a second position. When the movable guard plate is in the first position, the guard plate body of the movable guard plate is engaged with the fixed front chassis guard plate, and when the movable guard plate is in the second position, the guard plate body of the movable guard plate is engaged with the fixed rear chassis guard plate. It also includes a domain controller and a temperature sensor connected to the domain controller. The domain controller is also connected to the drive mechanism of the movable guard plate device and is used to control the drive mechanism to adjust the position of the movable guard plate according to the temperature signal collected by the temperature sensor. The movable guard plate device includes a guard plate guide rail and a movable guard plate. The movable guard plate includes a guard plate body and a drive mechanism connected to the guard plate body. The movable guard plate is slidably mounted on the guard plate guide rail via the drive mechanism and is installed below the power battery pack assembly of the vehicle via the guard plate guide rail. The drive mechanism is used to drive the guard plate body to move on the guard plate guide rail, thereby changing the shielding state of the power battery pack assembly. The driving mechanism includes a driving device, a connecting shaft, and rollers. The driving device is connected to the connecting shaft and is used to drive the connecting shaft to rotate. The end of the connecting shaft away from the driving device is connected to a roller, and the roller is located inside the guard plate guide rail. There is also a driving wheel ball between the roller and the guard plate guide rail. The temperature sensors include a power battery pack assembly side temperature sensor, a power battery pack assembly front temperature sensor, a power battery two-phase cable harness temperature sensor, a power battery explosion-proof valve temperature sensor, and a BMS temperature sensor.

2. The chassis system as described in claim 1, characterized in that, The movable guard plate device has a first limiting block and a second limiting block on the guard plate guide rail. When the movable guard plate is in the first position, the driving mechanism of the movable guard plate contacts the first limiting block. When the movable guard plate is in the second position, the driving mechanism of the movable guard plate contacts the second limiting block.

3. A chassis system as described in claim 1, characterized in that, When the movable guard plate is in the second position, the guard plate body does not obstruct the explosion-proof valve of the power battery pack assembly and the high-voltage wiring harness connected to the power battery pack assembly.

4. A vehicle, characterized in that, The vehicle includes a chassis system as described in any one of claims 1-3.

5. A method for controlling a chassis guard plate, characterized in that, Based on a chassis system as described in any one of claims 1-3, or a vehicle as described in claim 4, comprising: Obtain power battery temperature data; Based on the power battery temperature data, adjust the movable guard plate device; if the power battery temperature data is greater than a set threshold, control the movable guard plate device to move to the second position; otherwise, control the movable guard plate device to move to the first position.

6. The chassis guard plate control method as described in claim 5, characterized in that, The power battery temperature data includes the side temperature of the power battery pack assembly, the front temperature of the power battery pack assembly, the temperature of the two-phase cable harness of the power battery, the temperature of the power battery explosion-proof valve, and the BMS temperature. If the side temperature of the power battery pack assembly is greater than the first temperature threshold, or the front temperature of the power battery pack assembly is greater than the second temperature threshold, or the temperature of the two-phase cable harness of the power battery is greater than the third temperature threshold, or the temperature of the power battery explosion-proof valve is greater than the fourth temperature threshold, or the BMS temperature is greater than the fifth temperature threshold, the movable guard plate device is controlled to move to the second position.

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