Lower protection plate for protecting battery pack at lower part of vehicle body

Abstract

The utility model relates to the technical field of lower protection plate structures, in particular to a lower protection plate for protecting a battery pack at the lower part of a vehicle body, which comprises a locking and limiting unit, a plurality of protection units are arranged in the locking and limiting unit, locking mechanisms are arranged on four sides of the locking and limiting unit, and a first groove is arranged at the joint of the plurality of protection units; the protection units are provided with first grooves and second grooves, the first grooves are internally provided with reinforcement units, the reinforcement units comprise first metal reinforcement pieces and second metal reinforcement pieces, the protection units are provided with first protrusions and second protrusions, the first protrusions are arranged in the centers of the protection units, and the second protrusions are distributed around the first protrusions in a scattering mode. The protective strength of the lower protective plate is improved through the first metal reinforcing piece and the second metal reinforcing piece under the condition that the weight of the lower protective plate is not increased.

Description

Technical Field

[0001] The utility model relates to the technical field of lower guard plate structures, and in particular to a lower guard plate for protecting a battery pack at the bottom of a vehicle body. Background Art

[0002] The underbody shield is a key component in electric vehicle design, protecting the battery pack located underneath the vehicle from environmental damage. With the increasing popularity of electric vehicles, battery safety has become a key concern for consumers and manufacturers. Batteries, a core component of electric vehicles, are not only costly but also crucial to vehicle performance. Underbody shields must withstand risks such as road impact, gravel impact, and corrosion, while also addressing weight control, aerodynamics, and thermal management requirements to ensure superior protection without compromising the vehicle's overall performance and efficiency.

[0003] However, existing battery pack underbody guards typically use heavy materials to improve strength and durability, which increases the overall weight of the vehicle and affects the cruising range.

[0004] Therefore, there is an urgent need for a technology that can solve the problem of the battery pack's lower protective plate being too heavy. Utility Model Content

[0005] In view of this, the present invention aims at the deficiencies of the existing technology and proposes a lower guard plate for protecting the battery pack under the vehicle body, aiming to solve the problem that the embossing roller cannot be easily replaced.

[0006] The utility model provides a lower guard plate for protecting the battery pack under the vehicle body, comprising:

[0007] A locking limit unit, wherein several protective units are arranged in the locking limit unit, and locking mechanisms are arranged on the four sides of the locking limit unit, and a first groove is arranged at the connection of the several protective units; a reinforcement unit is arranged in the first groove, and the reinforcement unit includes a first metal reinforcement and a second metal reinforcement. The first metal reinforcement is arranged in the first groove in the middle of several of the protective units and extends in the left and right directions. The second metal reinforcement is arranged in the groove in the middle of several of the protective units. There are several second metal reinforcements, and the second metal reinforcements are arranged in an staggered manner. One side of the second metal reinforcement is attached to the side wall of the groove, and the other side is attached to the first metal reinforcement. Several of the protective units are provided with a first protrusion and a second protrusion. The first protrusion is arranged in the center of the protective unit, and several of the second protrusions are scattered around the first protrusion.

[0008] Furthermore, a convection channel is provided in the middle of several second protrusions, and there are several convection channels. The convection channels are branch-like channels, and a rotation angle is provided in the middle of the convection channel. One end of the convection channel extends to the first protrusion, and the other end of the convection channel extends to the locking limit unit. The first protrusion is an elliptical protrusion, and the convection channel includes a rotation channel. The circumference of the rotation channel corresponds to the circumference of the first protrusion.

[0009] Furthermore, the convection channel also includes a first channel, a second channel, a third channel and a fourth channel, and the first channel, the second channel, the third channel and the fourth channel are arranged opposite to each other with the first protrusion as the axis.

[0010] Furthermore, the protection unit is further provided with a plurality of first through holes and a plurality of second through holes, wherein the plurality of first through holes are provided on the plurality of second protrusions, and the plurality of second through holes are provided on the convection channel and the second protrusion.

[0011] Furthermore, the locking and limiting unit further includes a first limiting block, and the first limiting block is arranged on four sides of the locking and limiting unit.

[0012] Furthermore, the locking mechanism includes a first locking mechanism, a second locking mechanism, several third locking mechanisms and several fourth locking mechanisms, two first locking mechanisms are provided, the first locking mechanisms are respectively arranged on the upper and lower sides of the locking limit unit, the second locking mechanism is arranged on the right side of the locking limit unit, several third locking mechanisms and several fourth locking mechanisms are arranged on the left side of the locking limit unit, and several third locking mechanisms and several fourth locking mechanisms are arranged crosswise, and the first locking mechanism, the second locking mechanism, the several third locking mechanisms and the several fourth locking mechanisms are provided with a second limit block, and the second limit block is provided with a bolt hole.

[0013] Furthermore, a plurality of second grooves are provided on both sides of the back side of the first groove, the second grooves and the first groove form a wave shape, and the plurality of second grooves are smaller than the first grooves.

[0014] Furthermore, the first metal reinforcement is U-shaped, and third through holes penetrate through both sides of the first metal reinforcement.

[0015] Furthermore, flanges are provided on both sides of the protection unit.

[0016] Compared with the prior art, the utility model discloses the beneficial effect lies in: the utility model discloses the first recess that is arranged between the protection unit improves the overall rigidity and the impact resistance of the apron, thereby better protection battery package is exempted from the physical damage, and the recess in the second metal reinforcing piece between a plurality of protection units is staggered arrangement, not only increase the strength of structure, still utilize the dispersion of force of the staggered arrangement mode optimization, strengthen the torsional rigidity, and the second metal reinforcing piece is close to the recess lateral wall, and with the first metal reinforcing piece closely cooperate, thereby formed the stable frame structure, improved the overall deformation resistance of the apron, still can reduce vibration and noise to a certain extent, solve the problem that the apron under the battery package is too heavy. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The utility model provides a whole schematic diagram of the lower apron equipment of the battery package of the lower part of the car body protection for embodiment of the utility model,

[0018] Figure 2 The utility model provides the lower apron of the battery package of the lower part of the car body protection for embodiment of the utility model provides the enlarged view of A place in the lower apron,

[0019] Figure 3 The utility model provides the lower apron of the battery package of the lower part of the car body protection for embodiment of the utility model provides the back surface schematic diagram of the lower apron,

[0020] Figure 4 The utility model provides the lower apron of the battery package of the lower part of the car body protection for embodiment of the utility model provides the first metal reinforcing piece schematic diagram in the lower apron.

[0021] Among them: 1, locking and limiting unit, 2, protection unit, 3, first recess, 301, first metal reinforcing piece, 302, second metal reinforcing piece, 4, second recess, 5, first protrusion, 6, second protrusion, 7, convection passage, 8, rotation angle, 9, first through hole, 10, second through hole, 11, first limiting block, 12, third through hole, 13, flanging, 14, bolt hole. 15, rotation passage, 16, first passage, 17, second passage, 18, third passage, 19, fourth passage, 20, first locking mechanism, 21, second locking mechanism, 22, third locking mechanism, 23, fourth locking mechanism, 24, second limiting block, DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application, and obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0023] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0024] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0025] In the description of the present application, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The underbody protection plate of the automobile battery pack is a key component in the design of electric vehicles, which protects the battery pack located at the bottom of the vehicle from external damage. With the popularity of electric vehicles, battery safety has become the focus of consumers and manufacturers, because the battery is the core component of electric vehicles, not only high cost, but also plays a decisive role in vehicle performance. The underbody protection plate of the automobile battery pack needs to resist impact from the road, stone impact and corrosion risk, while also needs to consider weight control, aerodynamic effect and thermal management technical requirements, to ensure that it can provide excellent protection function, and does not affect the overall performance efficiency of the vehicle.

[0027] However, the existing battery pack underbody protection plate, in order to improve the strength and durability, usually uses heavy materials, which increases the overall weight of the vehicle, and further affects the cruising range.

[0028] Therefore, there is an urgent need for a technology to solve the problem of too heavy battery pack underbody protection plate.

[0029] Referring to Figure 1 , Figure 2As shown, this embodiment provides a lower guard plate for protecting a battery pack under a vehicle body, comprising: a locking and limiting unit 1, wherein a plurality of protective units 2 are arranged in the locking and limiting unit 1, and a locking mechanism is provided on four sides of the locking and limiting unit 1, and a first groove 3 is provided at the connection between the plurality of protective units 2; a reinforcement unit is provided in the first groove 3, and the reinforcement unit comprises a first metal reinforcement 301 and a second metal reinforcement 302, the first metal reinforcement 301 is arranged in the first groove 3 in the middle of the plurality of protective units 2 and extends in the left-right direction, the second metal reinforcement 302 is arranged in the groove in the middle of the plurality of protective units 2, and the second metal reinforcement 302 is provided in plurality, and the second metal reinforcements 302 are arranged in a staggered manner, one side of the second metal reinforcement 302 is adhered to the side wall of the groove, and the other side is adhered to the first metal reinforcement 301, and the plurality of protective units 2 are provided with a first protrusion 5 and a second protrusion 6, the first protrusion 5 is arranged in the center of the protective unit 2, and the plurality of second protrusions 6 are scattered around the first protrusion 5.

[0030] Specifically, the locking and limiting unit 1 is provided with multiple protective units 2, which, combined with the locking mechanism, ensure that the battery pack can maintain a stable position during the driving of the vehicle, reduce the risk of displacement caused by vibration or external impact, and ensure the safety and reliability of the battery system. In addition, the reinforcement unit is provided in the first groove 3 at the connection of the protective unit 2, and the first and second metal reinforcements 302 contained therein further enhance the structural rigidity of the guard plate; the first metal reinforcement 301 extends in the left and right directions to provide horizontal support and stability, while the staggered second metal reinforcements 302 not only enhance the overall stability, but also achieve more optimized force distribution and energy absorption by fitting the side walls of the groove and the first metal reinforcement 301, thereby improving the impact resistance and reducing deformation and damage caused by external physical impact. At the same time, the distribution of mechanical stress has been further optimized, especially when encountering road obstacles or severe driving conditions, reducing the service pressure on the guard plate material, thereby extending the service life. The first and second protrusions 6 serve a mechanical purpose. The central first protrusion 5 provides foundational support, enhancing local load-bearing capacity, while the peripheral second protrusions 6 disperse external forces over a wider area, preventing excessive load at a single point and demonstrating excellent compressive and bending resistance. The weight of the guard plate is optimized, achieving optimal strength and durability without adding burden to the vehicle.

[0031] As can be understood, the locking and limiting units 1, as the outermost metal components, form a solid boundary, stabilizing the entire structure and providing basic support and fixed position for subsequent components. They not only effectively limit and lock the guard plate in place, but also, in the event of an impact, absorb and disperse some of the energy through the strength of the surrounding metal components, thereby reducing the impact force within. The number and arrangement of the multiple internal guard units 2 can be flexibly adjusted based on the size or number of battery packs, adapting to the requirements of different vehicle models while reducing material waste. A first groove 3, located at the junction of the two guard units 2, provides a secure and concealed space for the first metal reinforcement 301. The first metal reinforcement 301 extends in the front-to-back direction, and its longitudinal layout ensures the guard plate's continuity and impact resistance in the primary direction of force. It can withstand potential impact forces from the left and right sides of the vehicle, maintaining the integrity and safety of the battery pack. The second metal reinforcement 302 is embedded between the guard units 2 in a staggered arrangement, forming a synergistic mechanical structure with the first metal reinforcement 301. This staggered arrangement not only disperses stress, improving torsional and shear resistance, but also reduces the likelihood of deformation of the overall structure under stress through multi-point support. The second metal reinforcement 302 adheres to the first metal reinforcement 301 on one side and to the sidewall of the groove on the other. This not only enhances overall rigidity but also tightens the connection of the entire structure, reducing the potential risk of loosening or displacement between components. This multi-layered structure provides more stable protection and greater durability during high-speed driving, bumpy roads, or extreme weather conditions.

[0032] In some embodiments of the present application, a convection channel 7 is arranged in the middle of several second protrusions 6, and several convection channels 7 are provided. The convection channels 7 are tree-shaped channels, and a rotation angle 8 is provided in the middle of the convection channel 7. One end of the convection channel 7 extends to the first protrusion 5, and the other end of the convection channel 7 extends to the locking limit unit 1. The first protrusion 5 is an elliptical protrusion, and the convection channel 7 includes a rotation channel 15. The circumference of the rotation channel 15 corresponds to the circumference of the first protrusion 5.

[0033] Specifically, the convection channel 7 is arranged in a tree-like pattern, achieving a more efficient thermal management function. The setting of the rotation angle 8 enables the channel to effectively guide convection in different directions, improves the efficiency of air flow, and reduces the risk of heat accumulation. One end extends to the first elliptical protrusion, and the other end is connected to the locking limit unit 1, forming a complete circulation path, promoting dynamic cooling and air flow, thereby providing more optimized temperature control conditions for the battery assembly. At the same time, the circumference of the rotation channel 15 corresponds to the circumference of the first protrusion 5, ensuring that energy loss is minimized during the flow process and improving the aerodynamic performance of the system. The heat dissipation efficiency of the guard plate is improved, and the thermal management capability of the vehicle under extreme working conditions is greatly improved, ensuring battery safety and efficiency. In addition, the channel network reduces air resistance by controlling the airflow, indirectly improving the energy efficiency of the entire vehicle.

[0034] As can be appreciated, the return flow channels formed between the second protrusions 6 create a complex path for air flow. These second protrusions 6 and the channels work together to optimize the aerodynamic properties of the fender, effectively reducing efficiency losses due to air resistance during driving, thereby improving fuel economy and battery life. They also disrupt the laminar flow of air over the vehicle, making the entire process more turbulent, thereby reducing wind noise to a certain extent. Reduced wind noise not only improves interior quietness, providing a quieter and more comfortable driving experience, but also reduces driver fatigue on long drives. Furthermore, the channels with a turning angle 8 disrupt air turbulence, reducing air velocity variations across the underbody, thereby reducing vibrations that can occur at high speeds and improving the stability of the vehicle structure and accessories. Furthermore, they provide physical protection for the underbody. The second protrusions 6 also absorb and disperse direct impacts from ground particles, rocks, and other debris that could potentially impact the battery pack and underbody. This can be achieved through integrated molding, reducing production costs and minimizing material waste during processing. Since these second protrusions 6 are calculated and designed, the use of materials can be optimized, so as to achieve the effects of long service life and optimized functions.

[0035] In some embodiments of the present application, the convection channel 7 further includes a first channel 16, a second channel 17, a third channel 18 and a fourth channel 19, and the first channel 16, the second channel 17, the third channel 18 and the fourth channel 19 are arranged opposite to each other with the first protrusion 5 as the axis.

[0036] Specifically, the convection channels 7 have four shapes, namely the first channel 16, the second channel 17, the third channel 18 and the fourth channel 19. Each channel is separated by the first protrusion 5, that is, the opposite channels are of the same shape, and the convection channels 7 are arranged opposite to each other with the first protrusion 5 as the axis.

[0037] As can be understood, the four convection channels 7 of different shapes—first channel 16, second channel 17, third channel 18, and fourth channel 19—are each separated by an elliptical first protrusion 5 and arranged in opposing directions with the first protrusion 5 as the axis. This comprehensively optimizes the lower guard plate structure protecting the battery pack, optimizing air flow paths and forming a complex and efficient convection network. This not only improves thermal management capabilities, allowing the battery to maintain an ideal temperature range under various operating conditions and extend its service life, but also ensures its performance stability and safety under high loads. The opposing channels, centered around the first protrusion 5, achieve multi-directional air flow through the various shapes, avoiding the formation of hot spots and improving overall heat dissipation efficiency. This reduces wind resistance under the vehicle, helps reduce energy consumption during driving, and thus improves the vehicle's range. As air flows through these channels, the diverse shapes and directional configurations effectively reduce noise and enhance driving comfort. In terms of structural strength, since the channel is separated by the first protrusion 5, the protrusion structure can effectively disperse the pressure when each channel is impacted, thereby reducing the local stress on the guard plate, improving the overall structural durability, and protecting the battery pack from external physical damage.

[0038] In some embodiments of the present application, the protective unit 2 is further provided with several first through holes 9 and several second through holes 10, several of the first through holes 9 are arranged on several of the second protrusions 6, and several of the second through holes 10 are arranged on the convection channel 7 and the second protrusion 6.

[0039] Specifically, there are several through holes on the protective unit 2, which are irregularly distributed on the protective unit 2. The through holes are divided into large through holes and small through holes. Some through holes will be set on the return channel, and some through holes will be set on the protrusion to achieve the effect of ventilation, heat dissipation and drainage.

[0040] Understandably, through-holes enhance ventilation and heat dissipation under the vehicle body. In electric and hybrid vehicles, battery pack heat dissipation is a critical issue, as efficient heat dissipation extends battery life and improves performance. Through-holes allow air to circulate more freely, effectively removing heat from the battery pack through natural convection or airflow generated during driving. By combining large and small through-holes, different through-hole sizes can achieve different functions. Large through-holes provide greater airflow and are suitable for areas requiring enhanced heat dissipation or poor circulation, while small through-holes are useful in areas where fine-tuning air flow and precise flow are required. In particular, large through-holes placed in the return duct can enhance overall air flow under the vehicle, mitigating localized overheating caused by heat accumulation. Furthermore, small through-holes placed on protrusions can enhance the exchange of outside air with the air under the vehicle due to the pressure differential generated by the air flow, assisting in the removal of hot air. Vehicles inevitably pass through flooded roads or encounter rain during driving, and the quality of drainage directly affects the protection of critical vehicle components. The irregular distribution of through-holes in the protective unit 2 facilitates water drainage, preventing water from accumulating under the vehicle for extended periods, reducing the risk of rust and short circuits to electrical components. Furthermore, the through-holes on the protrusions, taking advantage of their higher elevation, quickly guide accumulated water out, providing rapid drainage. This allows the protective plate to maintain strength through in-mold embedding technology during production while also reducing unnecessary material usage and weight through the through-hole design. This optimized structure reduces the vehicle's weight, which translates directly into longer driving range for electric vehicles and reduced fuel consumption for gasoline-powered vehicles.

[0041] In some embodiments of the present application, the locking and limiting unit 1 further includes a first limiting block 11 , and the first limiting block 11 is arranged on four sides of the locking and limiting unit 1 .

[0042] It can be understood that the locking limit unit 1 is used to fix and constrain key components, and the setting of the limit block further consolidates this function. The limit block can prevent the component from being displaced or loosened during use, ensuring a stable locking effect under various loads. By adding limit blocks on both sides of the bolt hole 14, the design ensures the precise positioning and fixation of the bolt. It can prevent the bolt from failing due to lateral sliding or shear force caused by vibration or external force, and play a dual stabilization role. In addition, the limit block helps to disperse the transmission of force, making the stress state at the connection more uniform, reducing the stress concentration of the material around the bolt hole 14, and reducing the possibility of fatigue damage. Workers can also align components more easily during construction or assembly, reducing installation errors and time. At the same time, during maintenance and inspection, the limit block can clearly display the original position of the component, making it easy to determine whether displacement has occurred, so that necessary maintenance operations can be taken quickly.

[0043] In some embodiments of the present application, the locking mechanism includes a first locking mechanism 20, a second locking mechanism 21, several third locking mechanisms 22 and several fourth locking mechanisms 23, and two first locking mechanisms 20 are provided. The first locking mechanisms 20 are respectively arranged on the upper and lower sides of the locking limit unit 1, the second locking mechanism 21 is arranged on the right side of the locking limit unit 1, and several of the third locking mechanisms 22 and several of the fourth locking mechanisms 23 are arranged on the left side of the locking limit unit 1. Several of the third locking mechanisms 22 and several of the fourth locking mechanisms 23 are arranged crosswise, and the first locking mechanism 20, the second locking mechanism 21, the several third locking mechanisms 22 and the several fourth locking mechanisms 23 are provided with a second limit block 24, and the second limit block 24 is provided with a bolt hole 14.

[0044] Specifically, the locking mechanisms are divided into four types, namely the first locking mechanism 20, the second locking mechanism 21, the third locking mechanism 22 and the fourth locking mechanism 23, among which the third locking mechanism 22 and the fourth locking mechanism 23 are provided in plurality, and two first locking mechanisms 20 are provided, which are respectively provided on the upper and lower sides of the locking limit unit 1, and the second locking mechanism 21 is provided on the right side of the locking limit unit 1, and several of the third locking mechanisms 22 and several of the fourth locking mechanisms 23 are provided on the left side of the locking limit unit 1, and several of the third locking mechanisms 22 and several of the fourth locking mechanisms 23 are arranged crosswise.

[0045] It is understood that the first locking mechanism 20 is designed to be located on the upper and lower sides of the locking and limiting unit 1. This layout achieves secure locking in the vertical direction, ensuring the vertical stability of the battery pack and effectively preventing the risk of battery loosening due to vehicle bumps or poor road conditions. Secondly, the second locking mechanism 21 is positioned to the right of the locking and limiting unit 1. The lateral support enhances left-right stability, increases lateral impact resistance, and further improves the safety and stability of the vehicle when cornering. Finally, the third and fourth locking mechanisms 23 are arranged in a cross-staggered arrangement, distributed on the left side of the locking and limiting unit 1. This staggered structure not only provides more secure support but also adds a double layer of insurance, ensuring that the battery pack remains stable under multi-directional impacts. This enhances the overall structural strength. Through the combined action of the locking mechanisms in different directions, impact energy is effectively absorbed and dispersed, extending the service life of the guard plate and battery pack. The cross-staggered arrangement of multiple locking devices can flexibly cope with various uneven loads. By cooperating with each other, the burden on individual mechanisms is reduced, improving efficiency and durability. In addition, the entire locking system is developed around the locking limit unit 1, so that the entire structure can maintain dynamic balance during the load-bearing and movement process, helping to reduce structural stress and prevent potential mechanical wear and damage.

[0046] In some embodiments of the present application, see Figure 3 As shown, a plurality of second grooves are provided on both sides of the back of the first groove, the second grooves and the first groove form a wave shape, and the plurality of second grooves are smaller than the first groove.

[0047] It is understandable that a number of second grooves 4 are provided on both sides of the back side of the first groove 3 to enhance the overall stability and stress resistance. When the first groove 3 is used to fix or support the first metal reinforcement 301 and the second metal reinforcement 302, the second groove 4 provided on its own back side helps to disperse and absorb the impact of external loads. The stress concentration inside the material is reduced, thereby reducing the possible risk of material fatigue and fracture, and improving the durability and safety of the structure. A combination of multiple grooves can use materials more efficiently, reduce material waste and may reduce the weight of the component. In addition, the combined design of the first groove 3 and the second groove 4 can improve the heat dissipation efficiency. The groove provides additional surface area, which can enhance the speed of heat exchange. The air flow in the groove is more complex than that on a smooth surface. This flow helps to quickly dissipate excess heat during high-temperature operation and maintain working stability.

[0048] In some embodiments of the present application, see Figure 4 As shown, the first metal reinforcement 301 is U-shaped, and third through holes 12 penetrate through both sides of the first metal reinforcement 301 .

[0049] In some embodiments of the present application, flanges 13 are provided on both sides of the protection unit 2 .

[0050] It is understandable that the design of the flange 13 can improve the structural strength and rigidity of the protective unit 2. When the edge of the material is folded outward to form the flange 13, it is equivalent to increasing the thickness and strength of the structure, thereby enhancing the overall anti-deformation ability. For the protective unit 2, especially when it needs to withstand external force impact or long-term load, it can prevent the components from deforming, bending or breaking, thereby extending its service life. The flange 13 provides a larger surface contact area, making the protective unit 2 more stable during installation and able to be more closely combined with other structural parts. The flange 13 can be used as an auxiliary process for installation and fixation, such as by means of screws or rivets, etc., to more firmly connect with other components, simplifying the installation process and improving assembly efficiency.

[0051] In some embodiments of the present application, bolt holes 14 are further provided on four sides of the locking and limiting unit 1 , and limiting blocks 11 are provided on the bolt holes 14 on both sides of the long side of the locking and limiting unit 1 .

[0052] It can be understood that the bolt mounting can fix the locking and limiting unit 1 to the support structure, ensuring the firmness of the overall structure, and effectively dispersing the applied load through the four-edge distribution, reducing stress concentration phenomenon, enhancing the durability and flexural performance of the structure. The limiting block 11 not only provides physical stop to prevent lateral movement and enhance the locking effect, but more importantly, simplifies the installation process. Through the limiting block 11, the operator can quickly and accurately align the components without excessive adjustment, reducing manual installation errors and corresponding time costs. Furthermore, the limiting block 11 ensures that the locking unit is not easy to loosen or deviate under extreme working conditions, thereby providing a reliable mechanical constraint to prevent displacement of the key components under stress.

[0053] The lower guard plate of the battery pack in the lower part of the vehicle body in each of the above embodiments improves the overall rigidity and impact resistance of the guard plate by the first groove arranged between the protection units, thereby better protecting the battery pack from physical damage, the second metal reinforcing member is arranged in the groove between the protection units in a staggered manner, which not only increases the strength of the structure, but also optimizes the force dispersion and enhances the torsional resistance by using the staggered arrangement, the second metal reinforcing member not only fits the groove side wall, but also closely cooperates with the first metal reinforcing member, thereby forming a stable frame structure, improving the overall anti-deformation ability of the guard plate, and also reducing vibration and noise to a certain extent, solving the problem of too heavy battery pack lower guard plate.

[0054] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A lower guard plate for protecting a battery pack under a vehicle body, comprising: A locking limit unit, wherein several protective units are arranged in the locking limit unit, and locking mechanisms are arranged on the four sides of the locking limit unit, and a first groove is arranged at the connection of the several protective units; a reinforcement unit is arranged in the first groove, and the reinforcement unit includes a first metal reinforcement and a second metal reinforcement. The first metal reinforcement is arranged in the first groove in the middle of several of the protective units and extends in the left and right directions. The second metal reinforcement is arranged in the groove in the middle of several of the protective units. There are several second metal reinforcements, and the second metal reinforcements are arranged in an staggered manner. One side of the second metal reinforcement is attached to the side wall of the groove, and the other side is attached to the first metal reinforcement. Several of the protective units are provided with a first protrusion and a second protrusion. The first protrusion is arranged in the center of the protective unit, and several of the second protrusions are scattered around the first protrusion.

2. The lower guard plate for protecting the battery pack under the vehicle body according to claim 1, characterized in that: A convection channel is arranged in the middle of several second protrusions, and several convection channels are arranged. The convection channels are branch-shaped channels, and a rotation angle is arranged in the middle of the convection channel. One end of the convection channel extends to the first protrusion, and the other end of the convection channel extends to the locking limit unit. The first protrusion is an elliptical protrusion, and the convection channel includes a rotation channel. The circumference of the rotation channel corresponds to the circumference of the first protrusion.

3. The lower guard plate for protecting the battery pack under the vehicle body according to claim 2, characterized in that: The convection channel further includes a first channel, a second channel, a third channel and a fourth channel, and the first channel, the second channel, the third channel and the fourth channel are arranged opposite to each other with the first protrusion as the axis.

4. The lower guard plate for protecting the battery pack under the vehicle body according to claim 3, characterized in that: The protection unit is further provided with a plurality of first through holes and a plurality of second through holes. The plurality of first through holes are provided on the plurality of second protrusions, and the plurality of second through holes are provided on the convection channel and the second protrusion.

5. The lower guard plate for protecting the battery pack under the vehicle body according to claim 4, characterized in that: The locking and limiting unit further includes a first limiting block, which is arranged on four sides of the locking and limiting unit.

6. The lower guard plate for protecting the battery pack under the vehicle body according to claim 1, characterized in that: The locking mechanism includes a first locking mechanism, a second locking mechanism, a plurality of third locking mechanisms and a plurality of fourth locking mechanisms. Two first locking mechanisms are provided, and the first locking mechanisms are respectively arranged on the upper and lower sides of the locking limit unit. The second locking mechanism is arranged on the right side of the locking limit unit. The plurality of third locking mechanisms and the plurality of fourth locking mechanisms are arranged on the left side of the locking limit unit. The plurality of third locking mechanisms and the plurality of fourth locking mechanisms are arranged crosswise. The first locking mechanism, the second locking mechanism, the plurality of third locking mechanisms and the plurality of fourth locking mechanisms are provided with a second limit block, and the second limit block is provided with a bolt hole.

7. The lower guard plate for protecting the battery pack under the vehicle body according to claim 1, characterized in that: A plurality of second grooves are provided on both sides of the back side of the first groove. The second grooves and the first groove form a wave shape. The plurality of second grooves are smaller than the first groove.

8. The lower guard plate for protecting the battery pack under the vehicle body according to claim 1, characterized in that: The first metal reinforcement is U-shaped, and third through holes penetrate through both sides of the first metal reinforcement.

9. The lower guard plate for protecting the battery pack under the vehicle body according to claim 1, characterized in that: Flanged edges are provided on both sides of the protection unit.

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