Movable guard plate device, chassis system, vehicle and chassis guard plate control method

Abstract

The invention provides a movable protection plate device, a chassis system, a vehicle and a chassis protection plate control method, and relates to the technical field of vehicle chassis, the device comprises a protection plate guide rail and a movable protection plate, the movable protection plate comprises a protection plate body and a driving mechanism connected with the protection plate body, the movable protective plate is arranged on the protective plate guide rail in a sliding manner through a driving mechanism, and is mounted below a power battery pack assembly of the vehicle through the protective plate guide rail; and the driving mechanism is used for driving the protective plate body to move on the protective plate guide rail, so that the shielding state of the power battery pack assembly is changed. The vehicle wind resistance can be reduced while the new energy system is prevented from being overheated.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle chassis, and in particular to a mobile guard plate device, a chassis system, a vehicle and a chassis guard plate control method. Background Art

[0002] Hybrid vehicles, unlike fuel vehicles and pure electric vehicles, have the engine and air intake, exhaust, and fuel supply systems of fuel vehicles, as well as the electric drive, battery, and high-voltage charging and discharging systems of pure electric vehicles, and also have a hybrid-specific transmission and generator. The structural design of the chassis of hybrid vehicles needs to be compatible with both the exhaust system and the new energy system. However, this compatible design will make the exhaust system and the new energy system close, resulting in the risk of potential overheating of structures in the new energy system such as the battery housing, battery high-voltage wiring harness, and battery explosion-proof valve. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the embodiments of the present disclosure provide a mobile guard plate device, a chassis system, a vehicle and a chassis guard plate control method, which can reduce the wind resistance of the whole vehicle while avoiding overheating of the new energy system. The technical solution is as follows:

[0004] In the first aspect, a mobile guard plate device is provided, comprising a guard plate guide rail and a mobile guard plate, wherein the mobile guard plate comprises a guard plate body and a driving mechanism connected to the guard plate body, the mobile guard plate is slidably arranged on the guard plate guide rail by the driving mechanism, and is installed under the power battery pack assembly of the vehicle through the guard plate guide rail; the driving 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 connecting shaft is connected to the roller at one end away from the driving device, and the roller is located in the guard plate guide rail; there is also a driving wheel ball between the roller and the guard plate guide rail.

[0006] In a second aspect, a chassis system is provided, comprising a fixed chassis front guard plate, a fixed chassis rear guard plate, a power battery pack assembly and a mobile guard plate device provided in the first aspect; the fixed chassis front guard plate is fixedly arranged under the front axle of the vehicle, the fixed chassis rear guard plate is fixedly arranged under the rear axle of the vehicle, the power battery pack assembly is located between the front axle and the rear axle, and the mobile guard plate device is arranged under the power battery pack assembly; a driving mechanism of the mobile guard plate device is used to drive the mobile guard plate to move between a first position and a second position, when the mobile guard plate is in the first position, the guard plate body of the mobile guard plate is spliced ​​with the fixed chassis front guard plate, and when the mobile guard plate is in the second position, the guard plate body of the mobile guard plate is spliced ​​with the fixed chassis rear guard plate.

[0007] In one possible implementation, a first limit block and a second limit block are provided on the guard plate guide rail of the mobile guard plate device. When the mobile guard plate is in the first position, the driving mechanism of the mobile guard plate contacts the first limit block. When the mobile guard plate is in the second position, the driving mechanism of the mobile guard plate contacts the second limit block.

[0008] In a possible implementation, when the movable guard plate is in the second position, the guard plate body of the movable guard plate does not block 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 a possible implementation, it also includes a domain controller and a temperature sensor connected to the domain controller. The domain controller is also connected to a driving mechanism of the mobile guard plate device and is used to control the driving mechanism to adjust the position of the mobile guard plate according to a temperature signal collected by the temperature sensor.

[0010] In a possible implementation, 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.

[0011] According to a third aspect, a vehicle is provided, comprising a chassis system provided by the second aspect.

[0012] In a fourth aspect, based on a chassis system provided in the second aspect or a vehicle provided in the third aspect, a chassis guard plate control method is further provided, comprising:

[0013] Obtain power battery temperature data;

[0014] According to the power battery temperature data, the mobile guard plate device is adjusted; if the power battery temperature data is greater than a set threshold, the mobile guard plate device is controlled to move to the second position, otherwise, the mobile guard plate device is controlled to move to the first position.

[0015] In one possible implementation, the power battery temperature data includes the side end temperature of the power battery pack assembly, the front end temperature of the power battery pack assembly, the two-phase cable harness temperature of the power battery, the power battery explosion-proof valve temperature and the BMS temperature; if the side end temperature of the power battery pack assembly is greater than the first temperature threshold, or the front end temperature of the power battery pack assembly is greater than the second temperature threshold, or the two-phase cable harness temperature of the power battery is greater than the third temperature threshold, or the power battery explosion-proof valve temperature 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.

[0016] The technical solution provided by the embodiments of the present disclosure brings the following beneficial effects:

[0017] The disclosed embodiments provide a mobile guard plate device, a chassis system, a vehicle and a chassis guard plate control method. A movable guard plate device is arranged below a power battery pack assembly, and the shielding state of the guard plate body to the power battery pack assembly can be flexibly changed according to temperature requirements, thereby avoiding overheating problems in structures in new energy systems such as battery housings, battery high-voltage wiring harnesses, and battery explosion-proof valves at the chassis, thereby improving the durability and reliability of related structures.

[0018] A fixed chassis front guard plate located under the front axle, a fixed chassis rear guard plate located under the rear axle, and a mobile guard plate device located under the power battery pack assembly are arranged in the chassis of the vehicle respectively. When heat dissipation is not required, or structures such as the battery pack need to be heated at low temperatures, the guard plate body of the mobile guard plate device is spliced ​​with the fixed chassis front guard plate. After the hot air flow in the front engine compartment flows to the front chassis guard plate, it can be guided to the battery pack and the high-voltage wiring harness through the guard plate body, thereby preheating the battery pack and the wiring harness at low temperatures. At the same time, the guard plate body can also keep warm, prevent foreign objects from hitting the battery and the high-voltage wiring harness, and reduce the wind resistance of the whole vehicle. When heat dissipation is required, the guard plate body is spliced ​​with the fixed chassis rear guard plate. At this time, the hot air flow in the front engine compartment can flow to the outside of the chassis after flowing to the front chassis guard plate, thereby preventing hot gases from heating structures such as the power battery pack, the high-voltage wiring harness, and the battery explosion-proof valve. At the same time, the low-temperature gas in the external environment can flow to heat sources such as the battery pack, the high-voltage wiring harness, and the battery explosion-proof valve for cooling.

[0019] The guard rail is installed under the power battery pack assembly. While providing guidance, it can also play a role in transmitting collision force. When the vehicle collides head-on, the collision force can be transmitted and dispersed backwards through the guard rail, thereby improving the overall safety of the vehicle body.

[0020] Advantages of additional aspects of the present disclosure will be given in part in the following description and in part will become apparent from the following description or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 is a structural schematic diagram of a chassis system provided by an embodiment of the present disclosure;

[0023] Figure 2 is a schematic diagram of a chassis system provided by an embodiment of the present disclosure when the movable guard plate is in a first position;

[0024] Figure 3 is a schematic diagram of a chassis system provided by an embodiment of the present disclosure when the movable guard plate is in a second position;

[0025] Figure 4 It is a schematic diagram of the matching relationship between a guard plate guide rail and a movable guard plate in a movable guard plate device provided in an embodiment of the present disclosure;

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

[0027] The reference numerals represent: 1. engine; 2. hybrid power gearbox; 3. power battery two-phase cable harness; 4. power battery explosion-proof valve; 5. power battery pack assembly; 6. guard rail; 7. drive mechanism; 701. drive device; 702. connecting shaft; 703. roller; 704. drive wheel ball; 8. guide rail fixing bolt; 9. guard body; 901. guard fixing bolt; 10. fuel tank assembly; 11. drive motor assembly; 12. rear muffler assembly ; 13. Pre-catalytic converter assembly and front muffler assembly; 14. Power battery pack assembly side temperature sensor; 15. Power battery pack assembly front temperature sensor; 16. Power battery two-phase cable harness temperature sensor; 17. Power battery explosion-proof valve temperature sensor; 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. Vehicle front floor body. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0029] The terms "first", "second", etc. in the specification, claims, and drawings of the present disclosure are used to distinguish different objects rather than to describe a specific order. Terms such as "upper", "lower", etc. that indicate orientation are described based on the positional relationship of each component structure under normal use. They are only used to describe relative positional relationships and do not necessarily indicate limitations on orientation. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. 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 that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0030] The present disclosure first provides a mobile 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 driving mechanism 7 connected to the guard plate body 9, the mobile guard plate is slidably set on the guard plate guide rail 6 through the driving mechanism 7, and is installed under the power battery pack assembly 5 of the vehicle through the guard plate guide rail 6; the driving 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] Since hybrid vehicles need to be compatible with the engine, exhaust system and other structures of traditional fuel vehicles, as well as the battery, high-voltage wiring harness and other structures of electric vehicles, and the battery, wiring harness and other structures are integrated with the exhaust system at the chassis, there may be potential high temperature risks, thereby reducing the durability and reliability of each component. At the same time, the cruising range and wind resistance of new energy vehicles have become important technical parameters that major OEMs pay attention to when developing vehicles. In order to take into account the normal working requirements of battery connection high-voltage wiring harness, battery explosion-proof valve, battery housing, etc., reduce the temperature of the above parts, improve the durability and reliability of related parts, and take into account wind resistance to improve cruising range, the embodiment of the present disclosure first provides a mobile guard plate device, a movable mobile guard plate device is set under the power battery pack assembly, and the shielding state of the guard plate body to the power battery pack assembly can be flexibly changed according to actual wind resistance, temperature and other requirements, thereby avoiding overheating problems in the structures in the new energy system such as the battery housing, battery high-voltage wiring harness, battery explosion-proof valve at the chassis, and improving the durability and reliability of the related structures.

[0032] The driving mechanism 7 includes a driving device 701, a connecting shaft 702 and a roller 703. The driving device 701 is connected to the connecting shaft 702 and can be in the form of a driving motor, a driving motor with a reducer, etc., for driving the connecting shaft 702 to rotate; the connecting shaft 702 is connected to a roller 703 at one end away from the driving device 701, and the roller 703 is located in the guard plate guide rail 6. In order to ensure smooth driving, the guard plate guide rail 6 is designed as two parallel guide rails, and the number of connecting shafts 702 and rollers 703 in the driving mechanism is correspondingly designed to be 2. The driving device is located between the two guide rails, and a connecting shaft 702 is symmetrically arranged on each side, and a roller 703 is connected to the end of each connecting shaft 702. There is also a driving wheel ball 704 between the roller 703 and the guard plate guide rail 6. The driving wheel ball can play a role in guiding the linear motion of the driving mechanism, and at the same time can make the system run more smoothly, and can also play a role in keeping the system stable when the driving mechanism stops moving.

[0033] The guard plate body 9 is fixed to the lower part of the driving device 701 by the guard plate fixing bolts 901. The guard plate guide rail 6 is fixedly arranged at the lower part of the power battery pack assembly 5 by the guide rail fixing bolts 8, and the guide rail fixing bolts 8 also penetrate the vehicle body front floor body 24 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 rail under the power battery pack assembly can also play a role in transmitting collision force. When the vehicle collides head-on, the collision force can be transmitted and dispersed backward through the guard rail, thereby improving the overall safety of the vehicle body.

[0035] The present disclosure further provides a chassis system, see Figure 1-Figure 3 , including a fixed chassis front guard plate 20, a fixed chassis rear guard plate 21, a power battery assembly 5 and a mobile guard plate device provided above. The fixed chassis front guard plate 20 is fixedly arranged under the front axle of the vehicle, the fixed chassis rear guard plate 21 is fixedly arranged under the rear axle of the vehicle, the power battery assembly 5 is located between the front axle and the rear axle, and the mobile guard plate device is arranged under the power battery assembly 5; the driving mechanism of the mobile guard plate device is used to drive the mobile guard plate to move between the first position and the second position. When the mobile guard plate is in the first position, the guard plate body 9 of the mobile guard plate is spliced ​​with the fixed chassis front guard plate 20, and when the mobile guard plate is in the second position, the guard plate body 9 of the mobile guard plate is spliced ​​with the fixed chassis rear guard plate 21.

[0036] The fixed chassis front guard plate 20 is located below the front axle and plays a protective role for the upper structure. In addition to the front axle, the vehicle's power system is also arranged above the fixed chassis front guard plate 20, including the engine 1, the hybrid power transmission 2 (DHT), and the pre-catalytic converter assembly and the front muffler assembly 13 connected to the engine 1, and the power battery two-phase cable harness 3 connected to the hybrid power 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 arranged at the rear axle, and the rear end of the power battery two-phase cable harness 3 is connected to the power battery pack assembly 5.

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

[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 at the lower part of the chassis system, wherein the fixed chassis front guard plate 20 and the fixed chassis rear guard plate 21 are fixedly arranged, and the guard plate body 9 is movably arranged, so that the overall gas flow direction at the chassis can be changed by flexibly adjusting the position of the guard plate body 9. Figure 2-Figure 3 The direction indicated by the middle arrow is the flow direction of the hot air flow in the front cabin. The state in which the mobile guard plate is in the first position and the guard plate body 9 and the fixed chassis front guard plate 20 are assembled is called the closed state of the mobile guard plate device. The state in which the mobile guard plate is in the second position and the guard plate body 9 and the fixed chassis rear guard plate 21 are assembled is called the open state of the mobile guard plate device.

[0039] In the closed state, the guard plate body of the mobile guard plate device is spliced ​​with the fixed chassis front guard plate. After the hot air flow from the front engine compartment flows to the front chassis guard plate, it can be guided to the battery pack and high-voltage wiring harness through the guard plate body. At this time, the battery pack and high-voltage wiring harness will be heated by the hot air flow. This state is suitable for the situation where structures such as the battery pack and high-voltage wiring harness are not overheated. The guard plate body can also prevent foreign objects from hitting the battery and high-voltage wiring harness, and reduce the wind resistance of the whole vehicle. In addition, when the ambient temperature is low, the battery pack and high-voltage wiring harness can also be preheated.

[0040] In the open state, the guard plate body of the mobile guard plate device is spliced ​​with the fixed chassis rear guard plate. This state is suitable for situations where structures such as battery packs and high-voltage wiring harnesses are overheated. At this time, after the hot air flow in the front cabin flows to the front chassis guard plate, it can flow to the outside of the chassis through the gap between the front chassis guard plate and the guard plate body, avoiding the hot gas from heating the power battery pack, high-voltage wiring harness, battery explosion-proof valve and other structures. At the same time, the low-temperature gas in the external environment can flow to the heat sources such as the battery pack, high-voltage wiring harness, battery explosion-proof valve and other places for cooling.

[0041] In one possible implementation, a first limit block 22 and a second limit block 23 are provided on the guard plate guide rail 6 of the mobile guard plate device. When the mobile guard plate is in the first position, the roller 703 of the driving mechanism of the mobile guard plate contacts the first limit block 22. When the mobile guard plate is in the second position, the roller 703 of the driving mechanism of the mobile guard plate contacts the second limit block 23.

[0042] In one possible implementation, when the mobile guard plate is in the second position, the guard plate body 9 of the mobile guard plate does not block 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 inflowing external airflow can dissipate heat for the above-mentioned components.

[0043] In one possible implementation, by collecting temperature data at the location of the relevant components of the power battery pack, it is determined whether there is an overheating risk, so as to achieve dynamic and flexible adjustment of the mobile guard plate according to the temperature. At this time, a domain controller is required for data processing and control. A temperature sensor is set corresponding to the location where the temperature data needs to be collected, and the domain controller 19 is connected to each temperature sensor, and the domain controller is connected to the driving mechanism of the mobile guard plate device, which is used to control the driving mechanism to adjust the position of the mobile guard plate according to the temperature signal collected by the temperature sensor.

[0044] The temperature sensors include a power battery pack assembly side end temperature sensor 14 arranged on the side of the power battery pack assembly, a power battery pack assembly front end temperature sensor 15 arranged at the front of the power battery pack assembly, a power battery two-phase cable harness temperature sensor 16 arranged 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 arranged at the power battery explosion-proof valve, and a BMS temperature sensor 18 arranged at the battery management system (BMS), which are respectively 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.

[0045] The embodiment of the present disclosure also provides a vehicle, the vehicle comprising the above-mentioned chassis system. The specific implementation of the vehicle is the same as the implementation of the above-mentioned chassis system, which will not be repeated here.

[0046] Based on the above-mentioned chassis system or vehicle, the embodiment of the present disclosure further provides a chassis guard plate control method, including:

[0047] Obtain power battery temperature data;

[0048] According to the power battery temperature data, the mobile guard plate device is adjusted; if the power battery temperature data is greater than a set threshold, the mobile guard plate device is controlled to move to the second position, otherwise, the mobile guard plate device is controlled to move to the first position.

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

[0050] The chassis guard plate control method is executed by the domain controller. The domain controller collects temperature values ​​T1-T5, and calculates the control signal for opening or closing through the calibrated logic control strategy. When the domain controller sends a closing signal, the drive mechanism receives the closing command issued by the domain controller, and confirms the opening and closing state of the current mobile guard plate through the 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 shaft and the roller to roll on the guard plate guide rail, driving the guard plate body to move linearly toward the front of the vehicle to the position of the first limit block, and the motor stops working to complete the closing action.

[0051] When the domain controller sends an opening signal, the driving mechanism receives the opening instruction from the domain controller and confirms the current opening and closing state of the mobile 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 driving device drives the shaft and the roller to roll on the guard plate guide rail, driving the guard plate body to move in a straight line toward the rear of the vehicle to the position of the second limit block, and the motor stops working to complete the opening action.

[0052] The logical control strategy calibrated in the domain controller, such as Figure 5 As shown, including:

[0053] Collect the temperature T1 of the power battery pack assembly. If T1>65℃ (calibrable), send an open signal;

[0054] Collect the front temperature T2 of the power battery pack assembly. If T2>80℃ (calibrable), send an open signal;

[0055] Collect the temperature T3 of the two-phase cable harness of the power battery. If T3>110℃ (calibrable), send an opening signal;

[0056] Collect the temperature T4 of the power battery explosion-proof valve. If T4>70℃ (calibrable), send an opening signal;

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

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

[0059] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A mobile guard plate device, characterized in that: It includes a guard plate guide rail and a movable guard plate, the movable guard plate includes a guard plate body and a driving mechanism connected to the guard plate body, the movable guard plate is slidably set on the guard plate guide rail through the driving mechanism, and is installed under the power battery pack assembly of the vehicle through the guard plate guide rail; the driving 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.

2. A mobile guard plate device as claimed in claim 1, characterized in that: 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 connecting shaft is connected to the roller at one end away from the driving device, and the roller is located in the guard plate guide rail. There is also a driving wheel ball between the roller and the guard plate guide rail.

3. A chassis system, characterized in that: It includes a fixed chassis front guard plate, a fixed chassis rear guard plate, a power battery pack assembly and a mobile guard plate device provided in the first aspect; the fixed chassis front guard plate is fixedly arranged under the front axle of the vehicle, the fixed chassis rear guard plate is fixedly arranged under the rear axle of the vehicle, the power battery pack assembly is located between the front axle and the rear axle, and the mobile guard plate device is arranged under the power battery pack assembly; the driving mechanism of the mobile guard plate device is used to drive the mobile guard plate to move between a first position and a second position, when the mobile guard plate is in the first position, the guard plate body of the mobile guard plate is spliced ​​with the fixed chassis front guard plate, and when the mobile guard plate is in the second position, the guard plate body of the mobile guard plate is spliced ​​with the fixed chassis rear guard plate.

4. A chassis system as claimed in claim 3, characterized in that: The guard plate guide rail of the movable guard plate device has a first limit block and a second limit block. When the movable guard plate is in the first position, the driving mechanism of the movable guard plate contacts the first limit block. When the movable guard plate is in the second position, the driving mechanism of the movable guard plate contacts the second limit block.

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

6. A chassis system as claimed in claim 3, characterized in that: It also includes a domain controller and a temperature sensor connected to the domain controller. The domain controller is also connected to the driving mechanism of the mobile guard plate device and is used to control the driving mechanism to adjust the position of the mobile guard plate according to the temperature signal collected by the temperature sensor.

7. A chassis system as claimed in claim 6, characterized in that: 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.

8. A vehicle, characterized in that: The vehicle comprises a chassis system as claimed in any one of claims 3-7.

9. A chassis guard plate control method, characterized in that: A chassis system according to any one of claims 3 to 7, or a vehicle according to claim 8, comprising: Obtain power battery temperature data; According to the power battery temperature data, the mobile guard plate device is adjusted; if the power battery temperature data is greater than a set threshold, the mobile guard plate device is controlled to move to the second position, otherwise, the mobile guard plate device is controlled to move to the first position.

10. A chassis guard plate control method as claimed in claim 9, characterized in that: The power battery temperature data includes the side end temperature of the power battery pack assembly, the front end temperature of the power battery pack assembly, the two-phase cable harness temperature of the power battery, the power battery explosion-proof valve temperature and the BMS temperature; if the side end temperature of the power battery pack assembly is greater than the first temperature threshold, or the front end temperature of the power battery pack assembly is greater than the second temperature threshold, or the two-phase cable harness temperature of the power battery is greater than the third temperature threshold, or the power battery explosion-proof valve temperature 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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