Battery protection device and vehicle

Abstract

To provide a battery protection device that is able to protect a side surface of a battery pack provided at the bottom of a vehicle, and a vehicle equipped with the battery protection device.SOLUTION: A battery protection device provided on a lower side of a side sill of a vehicle and located on at least one side surface of a battery pack provided on a lower side of a vehicle, includes a protection device body, wherein the side sill of the vehicle is provided with a downwardly extending projection, the projection being located between the protection device body and the battery pack, and the highest point of the protection device body relative to a horizontal plane is higher than the lowest point of the projection relative to the horizontal plane in a vertical direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to the technical field of electric vehicles, more particularly to a battery protection device and a vehicle equipped with a battery protection device. [Background technology]

[0002] Electric vehicles are the trend of future development. The battery pack is the core part for providing power to the vehicle, so the protection of the battery pack is very important. In order to protect the battery pack, a protection device is generally provided on the side of the battery pack.

[0003] The collision protection device disclosed in Patent Document 1 includes a collision prevention beam and a collapsible and contractible energy absorbing beam installed on the side of the collision prevention beam. When a collision occurs, the collision prevention beam comes into contact with a protrusion on the ground and absorbs a portion of the collision energy, and the remaining collision energy is then transmitted to the energy absorbing beam via the collision prevention beam. The energy absorbing beam collapses and contracts to absorb most of the collision energy and protect the battery pack. However, this collision protection device cannot adequately cover the sides of the battery pack, so when the collision prevention beam is hit, it easily deforms upward or downward, colliding with a portion of the battery pack that is not protected by the collision protection device and damaging the battery pack.

[0004] Patent Document 2 discloses a battery pack case that is beneficial for safety during automobile collisions. This battery pack case includes a battery case vertical surface and a mounting frame. The cross section of the mounting frame has a shape that approximates a triangle. However, since the triangular mounting frame is formed as a part of the battery case, it increases the weight of the vehicle body and affects fuel consumption performance. Furthermore, when a collision occurs, the battery pack is easily broken and cannot be effectively protected. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] China Utility Model No. 207781703 [Patent Document 2] China Utility Model No. 208324862 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above circumstances, the problem that the present invention aims to solve is to provide a battery protection device and a vehicle equipped with this battery protection device that overcomes the inability of conventional battery protection devices to completely and effectively protect the sides of a battery pack. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, a battery protection device according to one embodiment of the present invention is provided below a side sill of a vehicle and positioned on at least one side of a battery pack. The battery protection device includes a protection device main body. The side sill of the vehicle is provided with a protrusion extending downward, the protrusion being positioned between the protection device main body and the battery pack, and in the vertical direction, the highest point of the protection device main body relative to the ground plane is higher than the lowest point of the protrusion relative to the ground plane.

[0008] By installing the protection device main body on the side of the battery pack, the battery pack can be effectively protected. At the same time, since the protrusion of the vehicle's side sill is located between the battery pack and the protection device main body, and the highest point of the protection device main body is higher than the lowest point of the protrusion, when the vehicle receives a collision force, the protection device main body receives the collision force and moves toward the battery pack and contacts the protrusion. This allows most of the force to be distributed to the vehicle's side sill, reducing the impact on the battery pack. The double protection by the protection device main body and the protrusion allows the battery pack to be protected more effectively.

[0009] In one embodiment, there may be a gap between the protection device body and the protrusion, and between the protrusion and the battery pack. By providing gaps between the protection device body and the protrusion, and between the protrusion and the battery pack, a portion of the collision force can be absorbed to some extent, thereby reducing or preventing the impact of the collision force on the battery pack.

[0010] In one embodiment, the protection device main body is provided with a fixing portion. The fixing portion is fixed to a lower portion of a side sill of the vehicle, and the protection device main body and the side sill of the vehicle are spaced apart from each other at a portion other than the fixing portion. The protection device main body may extend downward so as to block a side surface of the battery pack, and the protection device main body and the battery pack may be spaced apart from each other at a portion other than the fixing portion.

[0011] The protection device main body is fixed and connected to the lower side of the vehicle's side sill via a fixing portion, and extends downward to block the side of the battery pack, thereby completely and effectively protecting the battery pack. The protection device main body and the battery pack, and the protection device main body and the side sill of the vehicle are all spaced apart from each other at a portion other than the fixing portion. After a collision, on the one hand, the collision force is transmitted to the side sill of the vehicle by the protection device main body via the fixing portion, so that most of the collision force is dispersed to the vehicle body, and the collision force against the side of the battery pack is greatly reduced. On the other hand, the protection device main body moves toward the battery pack when the collision force acts. However, the protection device main body and the side sill of the vehicle or the battery pack are separated from each other and are not in contact with each other at a portion other than the fixing portion, so that the collision force, which has already been dispersed to a large extent, is further absorbed by the gap and further removed, thereby reducing or preventing the impact of the collision force on the battery pack.

[0012] In one aspect, the battery pack is provided with a battery pack side portion, which is fixedly connected to a side sill of the vehicle, and the protection device main body and the battery pack side portion may be spaced apart from each other at a portion other than the fixed portion. The battery pack is fixed to the vehicle body by the side parts of the battery pack, thereby preventing the impact force from acting directly on the battery pack. At the same time, since the protection device main body and the side parts of the battery pack are spaced apart from each other in areas other than the fixing parts, this space can absorb part of the impact force, thereby more appropriately protecting the battery pack.

[0013] In one aspect, the battery pack side portion may be located between the underside of the vehicle's side sill and the protection device main body, and both the protection device main body and the battery pack side portion may be fixed to the underside of the vehicle's side sill by the fixing portion. In a fixing method in which both the protection device main body and the side portion of the battery pack are fixed to the underside of the vehicle's side sill by the fixing portion, the number of fixing points can be reduced while more effectively transmitting force to the vehicle's side sill and reducing the force received by the side of the battery pack, thereby effectively protecting the battery pack.

[0014] In one aspect, in the vertical direction, the lowest point of the protection device body with respect to the horizontal may be lower than the lowest point of the battery pack with respect to the horizontal. By setting the bottom end of the protection device body lower than the lowest point of the battery pack, the bottom ends of the sides of the battery pack can be effectively prevented from directly contacting projections on the ground, thereby more suitably protecting the battery pack.

[0015] In one aspect, the protection device body may have an extension portion facing and spaced apart from a lower surface of the battery pack, the extension portion partially overlapping with the lower surface of the battery pack in the vertical direction. The protection device main body has an extension part that faces and is spaced apart from the bottom surface of the battery pack, so that even if the battery protection device is hit and turns around, the bottom end of the side surface of the battery pack will not directly hit a protruding object such as a curb. The extension part suitably covers the side surface of the battery pack, so that the battery pack can be suitably protected.

[0016] In one embodiment, a cavity may be formed within the protection device body. By providing such a cavity, it is possible to secure space for absorbing energy. When a collision occurs, the cavity inside the protection device body deforms and absorbs the impact force, which effectively disperses the impact force and absorbs the impact energy, thereby reducing damage to the battery pack and protecting it.

[0017] In one embodiment, the protection device main body may include a first plate and a second plate, the first plate being closer to the battery pack than the second plate, a portion of a plate body of the first plate bulging toward the battery pack relative to the second plate, and both side edges of the first plate and both side edges of the second plate being connected to form the cavity. By connecting the first plate and the second plate to form the protection device body, the protection device body can be easily constructed and an internal cavity can be formed. In such a structure in which the first plate and the second plate are connected, the cavity space can be expanded as much as possible, and the impact force can be absorbed more effectively.

[0018] In one embodiment, the second plate may be inclined downward toward the battery pack. When hit by a projection on the ground, the inclined surface formed by the second plate moves the protection device body towards the battery pack, absorbing the force of the collision and reducing the impact on the battery pack.

[0019] In one embodiment, the first plate may bulge toward the battery pack to form a bent portion, and a portion of the first plate located below the bent portion may be formed as a vertical portion that is parallel to a side of the battery pack. After a collision, the vertical portion installed parallel to the side surface of the battery pack sticks to the side surface of the battery pack, thereby dispersing the force received by the side surface of the battery pack.

[0020] In one embodiment, the protection device body may be provided with a drainage hole, and the drainage hole may be formed by a connection portion between the first plate and the second plate. By providing the drainage hole, water that enters the inside of the protection device body can be drained. By forming the drainage hole at the connection part of the first plate and the second plate, the first plate and the second plate can be fixed suitably and the water can be drained more conveniently.

[0021] In one embodiment, the protection device body may be provided along one side of the battery pack, and at least one end of the protection device body may extend from one side of the battery pack toward an adjacent side. By installing the protection device body so that it extends from one side of the battery pack to the adjacent side, each side of the battery pack can be more effectively protected and the impact on the battery pack in the event of a collision can be reduced. The battery protection device according to each of the above-mentioned aspects can suitably cover the side surfaces of the battery pack and can effectively absorb and reduce impacts on the battery pack, thereby suitably protecting the battery pack and extending its service life.

[0022] One aspect of the present invention provides a vehicle including a battery pack fixed to a vehicle body, the vehicle further including a battery protection device according to any one of the above aspects. Effect of the Invention

[0023] According to the battery protection device and vehicle of the present invention, the battery protection device includes a protection device main body and a fixing part, the protection device main body is fixed to the side sill of the vehicle via the fixing part, the protection device main body is installed with a gap between the battery pack, and the protection device main body has a structure having a cavity. When the battery protection device is hit, the collision force is transmitted to the side sill of the vehicle via the fixing part by the protection device main body, dispersing most of the collision force to the vehicle body and greatly reducing the collision force on the side of the battery pack. Meanwhile, since there is a gap between the protection device main body and the battery pack, the protection device main body moves toward the battery pack side due to the action of the collision force, and the upper end of the protection device main body abuts against the protruding part of the side sill of the vehicle, thereby further transmitting a part of the collision force to the vehicle body. Furthermore, the gap formed between the protection device main body and the battery pack can absorb and remove a part of the collision force, so that the collision force received by the battery pack can be reduced to the maximum extent and the battery pack can be protected more suitably. [Brief description of the drawings]

[0024] [Figure 1] 1 is an assembly schematic diagram of a battery protection device according to an embodiment of the present invention; [Diagram 2] 2 is a cross-sectional view taken along line AA in the structure shown in FIG. [Diagram 3] 1 is a first schematic diagram showing the structure of a battery protection device according to an embodiment of the present invention. [Figure 4] 2 is a second schematic diagram showing the structure of a battery protection device according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] In order to more clearly explain the technical problem, technical configuration and effects of the present invention, the present invention will be described in more detail below with reference to the drawings and embodiments. Here, specific embodiments are described to explain the configuration of the present invention, and are not intended to limit the present invention. The directions and positional relationships in this embodiment are described from the perspective of a passenger inside the vehicle.

[0026] In this embodiment, the battery pack is attached to the bottom of the vehicle, for example, connected to the floor of the vehicle and located below the passenger compartment of the vehicle. Referring to FIG. 1, the battery protection device 10 according to this embodiment can be installed on the front, rear, left and right sides of the battery pack 20. Alternatively, the battery protection device 10 is installed on one of the front, rear, left and right sides of the battery pack 20 and extends to the adjacent side. For example, the battery protection device 10 is installed on the left side of the battery pack 20 and extends forward, the battery protection device 10 is installed on the right side of the battery pack 20 and extends forward, and the battery protection device 10 is installed on the left side of the battery pack 20 and extends forward and rear. 2, the battery protection device 10 according to this embodiment includes a protection device main body 100. A downwardly extending protrusion 310 is provided on the side sill 30 of the vehicle, and the protrusion 310 is located between the protection device main body 100 and the battery pack 20. In the vertical direction, the highest point of the protection device main body 100 relative to the ground plane is higher than the lowest point of the protrusion 310 relative to the ground plane.

[0027] Here, one end of the protection device main body 100 is close to the side sill 30 of the vehicle. The portion of the protection device main body 100 where the one end faces the protruding portion 310 is defined as the upper end portion 130 of the protection device main body 100. The protruding portion 310 is located between the upper end portion 130 and the battery pack 20. The highest point of the protection device main body 100 with respect to the ground plane is the highest point of the upper end portion 130. In this embodiment, the protection device main body 100 is installed on the side of the battery pack 20, so that the battery pack 20 can be effectively protected. At the same time, the protruding portion 310 of the side sill 30 of the vehicle is located between the battery pack 20 and the upper end portion 130 of the protection device main body 100, and the highest point of the upper end portion 130 is higher than the lowest point of the protruding portion 310. When the vehicle receives a collision force, the protection device main body 100 receives the force and moves toward the battery pack 20, and the upper end portion 130 comes into contact with the protrusion 310, dispersing most of the force to the vehicle's side sill 30. This reduces the impact of the collision force received by the battery pack 20, and the double protection provided by the protection device main body 100 and the protrusion 310 allows the battery pack 20 to be more appropriately protected.

[0028] In this embodiment, the protrusion 310 is spaced a certain distance from the upper end 130 of the protection device main body 100, and is also spaced a certain distance from the protrusion 310 and the battery pack 20. Here, the distance between the protrusion 310 and the upper end 130 of the protection device main body 100 may be smaller than the distance between the protrusion 310 and the battery pack 20. The distance between the upper end 130 of the protection device main body 100 and the protrusion 310, and the distance between the protrusion 310 and the battery pack 20 can absorb some of the collision force to some extent, so that the impact caused by the collision force received by the battery pack 20 can be reduced or eliminated.

[0029] Further, referring to FIG. 2, the battery pack 20 according to the present embodiment includes a battery pack body 210 and a battery pack side portion 220 provided on one side of the battery pack body 210. The battery pack body 210 is fixed and connected to the bottom of the vehicle. The battery pack side portion 220 is fixed and connected to the lower surface of the side sill 30 of the vehicle. The above-mentioned protrusion 310 may be located between the upper end portion 130 and the battery pack side portion 220. There is a gap between the protrusion portion 310 and the battery pack side portion 220. Since the upper end portion 130 of the protection device body 100 extends upward and approaches the lower surface of the side sill 30 of the vehicle, and the upper end portion 130 and the protrusion portion 310 are located on the side of the battery pack side portion 220, the protection of the battery pack side portion 220 can be strengthened and the battery pack 20 can be more suitably protected.

[0030] 2, in one possible embodiment, a fixing portion 200 is provided on the protection device main body 100. The fixing portion 200 is fixed below a side sill 30 of the vehicle. The protection device main body 100 and the side sill 30 of the vehicle are installed with a gap therebetween in a portion other than the fixing portion 200. The protection device main body 100 extends downward to block the side surface of the battery pack 20. The protection device main body 100 and the battery pack 20 are installed with a gap therebetween in a portion other than the fixing portion 200.

[0031] The protection device main body 100 according to this embodiment is fixed to the lower surface of the vehicle's side sill 30 via the fixing part 200, and extends downward to block the side of the battery pack 20, thereby completely and effectively protecting the battery pack 20. There is a gap between the protection device main body 100 and the vehicle's side sill 30, and between the protection device main body 100 and the battery pack 20, in a portion other than the fixing part 200. More preferably, there is a gap between the protection device main body 100 and the above-mentioned battery pack side part 220, in a portion other than the fixing part 200.

[0032] Upon collision, on the one hand, the collision force is transmitted by the protection device main body 100 to the vehicle side sill 30 via the fixing portion 200, dispersing most of the collision force to the vehicle body and greatly reducing the collision force on the side of the battery pack 20. On the other hand, when the collision force acts, the protection device main body 100 moves toward the battery pack 20. Since the protection device main body 100, the vehicle side sill 30, and the battery pack 20 are not in contact with each other and have gaps between them other than the fixing portion 200, most of the collision force is further absorbed or removed by the gaps, and the battery pack 20 receives less impact from the collision force or does not receive any impact at all.

[0033] In this embodiment, the battery pack side part 220 is located between the lower surface of the side sill 30 of the vehicle and the protection device main body 100, and the protection device main body 100 and the battery pack side part 220 are both fixed to the lower surface of the side sill 30 of the vehicle via the fixing part 200. For example, the protection device main body 100 and the battery pack side part 220 can be fixed to the lower surface of the side sill 30 of the vehicle at the same time using a mechanical fixing member passing through the fixing part 200. As shown in the example in FIG. 2, a penetrating fixing hole 113 is formed in the fixing part 200, and the above-mentioned mechanical fixing member fixes the protection device main body 100 and the battery pack side part 220 to the side sill 30 of the vehicle via this fixing hole 113. In this embodiment, the protection device main body 100 and the battery pack side portion 220 are fixed to the vehicle's side sill 30 via the same fixing points, thereby reducing the number of fixing points and more efficiently transmitting force to the vehicle's side sill 30, thereby reducing the amount of force received by the side of the battery pack 20, thereby effectively protecting the battery pack 20.

[0034] According to another configuration, the battery pack side part 220 and the protection device main body 100 may be fixed separately to the vehicle side sill 30. For example, a first mechanical fixing member can fix the protection device main body 100 to the lower surface of the vehicle side sill 30 via the fixing part 200, and then a second mechanical fixing member can be used to fix the battery pack side part 220 to the lower surface of the vehicle side sill 30.

[0035] In this embodiment, the lowest point of the protection device main body 100 relative to the ground horizontal is lower than the lowest point of the battery pack 20 relative to the ground horizontal along the vertical direction. By making the lower end of the protection device main body 100 lower than the lowest point of the battery pack 20, it is possible to effectively prevent the lower end of the side surface of the battery pack 20 from directly contacting a protrusion on the ground, and it is possible to more appropriately protect the battery pack 20.

[0036] More preferably, in the example shown in Fig. 2, the lower end of the protection device main body 100 extends below the lower surface of the battery pack 20 to form the extension portion 140. The extension portion 140 partially overlaps the lower surface of the battery pack 20 in the vertical direction. The protection device main body 100 according to this embodiment can completely cover the side surface of the battery pack 20, and therefore more suitably protects the battery pack 20. After the battery protection device 10 rotates upon impact, the lower end of the side surface of the battery pack 20 does not directly impact a protrusion such as a curb, and the side surface of the battery pack 20 is suitably covered by the extension portion 140, so that the battery pack 20 is suitably protected.

[0037] Referring to Fig. 3, the battery protection device 10 includes a fixed stand 150. One end of the fixed stand 150 is connected to the protection device main body 100, and the other end is connected to the vehicle body. The fixed stand 150 directly connects the battery protection device 10 to the vehicle body. By fixing the battery protection device 10 directly to the vehicle body, rather than to the battery pack 20, the area subjected to the collision force and the area that is deformed can be limited to the battery protection device 10, thereby reducing the impact on the battery pack 20. Furthermore, this configuration allows for convenient replacement of parts.

[0038] 1 and 2, in an embodiment in which the battery protection device 10 is provided on the left side of the battery pack 20 and extends toward the front side, the protection device body 100 has a first part 101 covering the left side of the battery pack 20 and a second part 102 extending toward the front side of the battery pack 20. The first part 101 of the protection device body 100 can be fixed directly to the lower surface of the side sill 30 of the vehicle through the fixing part 200 using a mechanical fixing member. The second part 102 of the protection device body 100 is fixed and connected to the vehicle body via the fixing stand 150 described above.

[0039] As shown in Fig. 2, in one possible embodiment, a cavity is formed inside the protection device body 100. More preferably, the cross section of the cavity is shaped like a triangle. However, the cross section of the cavity may have other shapes. For example, a square, a trapezoid, a circle, or other shapes that are easily conceivable to those skilled in the art in this field may be used.

[0040] The cavity-forming configuration can secure a space for absorbing energy. Furthermore, the cavity having a cross section approximating a triangle is relatively stable. When a collision occurs, the cavity inside the protection device main body 100 deforms and absorbs the collision force, which is advantageous for dispersing the collision force and absorbing the collision energy, reducing damage to the battery pack 20 and more suitably protecting the battery pack 20.

[0041] As shown in the example of FIG. 2, the protection device body 100 includes a first plate 110 close to the battery pack 20 and a second plate 120 far away from the battery pack 20. The first plate 110 bulges toward the battery pack 20. The fixing portion 200 can be installed on the first plate 110. The second plate 120 may be an inclined plate that is inclined downward toward the battery pack 20 in the vertical direction. Both ends of the first plate 110 and both ends of the second plate 120 are connected to form a cavity structure having a shape that is approximately triangular. The battery pack side portion 220 is located between the side sill 30 of the vehicle and the first plate 110, and the first plate 110, the side surface of the battery pack 20, and the battery pack side portion 220 have a certain distance therebetween, with a gap in the portion other than the fixing portion 200.

[0042] When the battery protection device 10 is struck by a protrusion on the ground, the cavity inside the protection device body 100 deforms and absorbs the impact force. Since the outward surface of the protection device body 100 is an inclined surface, when the inclined surface is struck by a protrusion on the ground, it tends to move the protection device body 100 toward the battery pack 20. The gap between the first plate 110 and the battery pack 20 can absorb and reduce the impact force.

[0043] Both ends of the first plate 110 and both ends of the second plate 120 according to the above-mentioned embodiment can be connected by a welding method, but the method is not limited thereto. The first plate 110 is installed as close as possible to the side of the battery pack 20, thereby expanding the cavity space and absorbing a larger impact force. As shown in the example of FIG. 2, the first plate 110 bulges toward the connecting portion 230 between the battery pack side portion 220 and the battery pack main body 210, thereby expanding the cavity space of the shape that is close to the triangle formed by the first plate 110 and the second plate 120 as much as possible, and absorbing the impact force more suitably.

[0044] Furthermore, the first plate 110 bulges toward the connecting portion 230 between the battery pack side portion 220 and the battery pack body 210 to form a bent portion 111. Below the bent portion 111, a vertical portion 112 parallel to the side surface of the battery pack body 210 is provided. When a collision occurs, the vertical portion 112 parallel to the side surface of the battery pack body 210 can be attached to the side surface of the battery pack body 210. This distributes the force received by the battery pack 20. The portion of the first plate 110 above the bent portion 111 can be formed to be parallel to the lower surface of the battery pack side portion 220. With this configuration, when a collision occurs, the contact area between the first plate 110 and the battery pack side portion 220 is relatively large, which is advantageous for dispersing the force received by the battery pack 20.

[0045] The above-mentioned fixing portion 200 can be provided on the first plate 110. More specifically, the first plate 110 can be connected to the battery pack side portion 220 through the fixing hole 113 using a mechanical fixing member, and further connected to the lower surface of the side sill 30 of the vehicle. The second plate 120 may be provided with a processing hole 121 corresponding to the fixing hole 113 in order to pass through the mechanical fixing member.

[0046] 3, the first plate 110 is provided with a lightening hole 114 formed by hollowing out. The lightening hole 114 can reduce the weight of the battery protection device 10 to a certain extent. The lightening hole 114 may be provided in the second plate 120.

[0047] Referring to FIG. 4, the protection device body 100 further has a water drain hole 160 formed therein. The water drain hole 160 is provided at a position where the first plate 110 and the second plate 120 are connected. For example, a plurality of notches are formed on the side of the second plate 120, and when the first plate 110 and the second plate 120 are welded together, the notches form the water drain hole 160. When the protection device body 100 is formed by connecting the first plate 110 and the second plate 120, forming the water drain hole 160 at the connecting portion between the first plate 110 and the second plate 120 is advantageous for draining water that enters the battery protection device 10 while realizing a simple manufacturing method. Of course, the water drain hole 160 may be formed in the first plate 110 and / or the second plate 120 as long as the water in the cavity can be discharged.

[0048] 1, a vehicle according to another embodiment of the present invention includes a battery pack 20 fixed to a vehicle body and the battery protection device 10 according to the above-described embodiment. The battery protection device 10 can improve the safety of the battery pack 20 during a collision.

[0049] 1 and 2, in one embodiment of the present invention, the battery protection device 10 is installed on a side of the battery pack 20. The battery protection device 10 includes a protection device body 100. The protection device body 100 includes a first part 101 covering the left side of the battery pack 20 and a second part 102 extending to the front side of the battery pack 20. The first part 101 of the protection device body 100 is fixed to the lower surface of the side sill 30 of the vehicle via a mechanical fixing member, and the second part 102 is fixed and connected to the vehicle body via a fixing stand 150. The protection device body 100 is provided with a fixing part 200, and the protection device body 100 includes a first plate 110 adjacent to the battery pack 20 and a second plate 120 spaced apart from the battery pack 20. The first plate 110 bulges toward the battery pack side part 220 and the connecting part 230 of the battery pack body 210. The second plate 120 is an inclined plate that inclines downward toward the battery pack 20 along the vertical direction. Both sides of the first plate 110 and both sides of the second plate are welded to form a cavity having a shape that approximates a triangle. The fixing part 200 is installed on the first plate 110, and the first plate 110 and the battery pack side part 220 are fixed and connected to the lower surface of the side sill 30 of the vehicle via a mechanical fixing member that passes through the fixing part 200. The first plate 110 is not in contact with the battery pack 20 and the side sill 30 of the vehicle, with a gap provided in the parts other than the fixing part 200.

[0050] The side sill 30 of the vehicle has a protruding portion 310 that protrudes downward. The protruding portion 310 is located between the battery pack side portion 220 and the upper end portion 130 of the protection device main body 100, and the distance between the protruding portion 310 and the upper end portion 130 of the protection device main body 100 is smaller than the distance between the protruding portion 310 and the battery pack side portion 220. In the vertical direction, the highest point of the upper end portion 130 is higher than the lowest point of the protruding portion 310. The lower end of the protection device main body 100 extends downward from the lower surface of the battery pack 20 to form an extension portion 140. The extension portion 140 overlaps a part of the lower surface of the battery pack 20 in the vertical direction. A plurality of lightening holes 114 are provided in the first plate 110. A water drainage hole 160 is provided at a position where the first plate 110 and the second plate 120 are connected.

[0051] When a collision force is received, the collision force is transmitted to the vehicle side sill 30 by the protection device main body 100 via the fixing portion 200, so that most of the collision force is dispersed to the vehicle body, and the collision force on the side of the battery pack 20 is greatly reduced. On the other hand, when the protection device main body 100 moves toward the battery pack 20 side due to the action of the collision force, the upper end of the protection device main body 100 comes into contact with the protruding portion 310, and a part of the collision force is transmitted to the vehicle body. Since the protection device main body 100, the vehicle side sill 30, and the battery pack 20 are not in contact with each other with a gap therebetween except for the fixing portion 200, the collision force that has already been dispersed for the most part is absorbed or removed by this gap. At the same time, the cavity formed inside the protection device main body 100 can also absorb the collision force, so that the impact on the battery pack 20 due to the collision force can be reduced or removed. In addition, the upper end of the protection device main body 100 extends to the lower surface of the vehicle's side sill 30, and the lower end extends to cover part of the lower surface of the battery pack 20, thereby completely protecting the side of the battery pack 20 and reducing or eliminating the impact on the battery pack 20 caused by a collision force.

[0052] The technical features of the above-mentioned embodiments can be combined in various ways. For the sake of brevity, not all possible combinations of the technical features of the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it is within the scope of the present specification. Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents described in the claims, as well as in the scope and spirit of the invention. [Explanation of symbols]

[0053] 10 Battery protection device 100 Protective device body 101 First Part 102 Second Part 110 First Plate 111 Bend section 112 Vertical section 113 Fixed hole 114 Lightweight Hole 120 Second Plate 121 Machining hole 130 Upper end 140 Extension 150 Fixed Stand 160 Drain hole 200 Fixed part 20 Battery Pack 210 Battery pack body 220 Battery pack side 230 Connection section 30 Side sill 310 Protrusion

Claims

1. A battery protection device provided under a side sill of a vehicle and positioned on at least one side of a battery pack provided under the vehicle, The battery protection device includes a protection device body, a protrusion extending downward is provided on a side sill of the vehicle, the protrusion being located between the protection device main body and the battery pack, and in a vertical direction, a highest point of the protection device main body with respect to a ground plane is higher than a lowest point of the protrusion with respect to the ground plane; The protection device body is provided with a fixing portion, The fixing portion is fixed to a lower portion of a side sill of the vehicle, The protection device main body and the side sill of the vehicle are spaced apart from each other at a portion other than the fixing portion, the protection device main body extends downward so as to cover a side surface of the battery pack, and the protection device main body and the battery pack are spaced apart from each other at a portion other than the fixing portion, The battery pack is provided with a battery pack side portion, the battery pack side portion is fixedly connected to a side sill of the vehicle, A battery protection device, characterized in that the protection device body and the battery pack side portion are spaced apart from each other in a portion other than the fixed portion.

2. 2. The battery protection device according to claim 1, wherein there is a gap between the protection device body and the protruding portion, and between the protruding portion and the battery pack.

3. The battery protection device according to claim 1, characterized in that the battery pack side portion is located between the underside of the vehicle's side sill and the protection device main body, and the protection device main body and the battery pack side portion are both fixed to the underside of the vehicle's side sill by the fixing portion.

4. 2. The battery protection device according to claim 1, wherein a lowest point of the protection device body with respect to the horizontal in the vertical direction is lower than a lowest point of the battery pack with respect to the horizontal.

5. the protection device body has an extension portion facing and spaced from a bottom surface of the battery pack, The battery protection device according to claim 1 , wherein the extension part partially overlaps with a lower surface of the battery pack in the vertical direction.

6. 6. The battery protection device according to claim 1, wherein a cavity is formed inside the protection device body.

7. The protection device body includes a first plate and a second plate, the first plate is closer to the battery pack than the second plate, and a portion of the first plate bulges toward the battery pack relative to the second plate; 7. The battery protection device according to claim 6, wherein both sides of the first plate and both sides of the second plate are connected to form the cavity.

8. 8. The battery protection device according to claim 7, wherein the second plate is inclined downwardly toward the battery pack.

9. the first plate bulges toward the battery pack to form a bent portion, 8. The battery protection device according to claim 7, wherein a portion of the first plate located below the bent portion is formed as a vertical portion parallel to a side surface of the battery pack.

10. The protection device body is provided with a drain hole, 8. The battery protection device according to claim 7, wherein the drain hole is formed in a connection portion between the first plate and the second plate.

11. the protection device body is provided along one of the side surfaces of the battery pack, 2. The battery protection device according to claim 1, wherein at least one end of the protection device body extends from one side of the battery pack toward an adjacent side of the battery pack.

12. A vehicle including a battery pack fixed to a vehicle body, the vehicle further comprising the battery protection device according to any one of claims 1 to 11.

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