Battery pack

Abstract

To provide a battery pack which can properly protect a battery against an impact, such as a side collision, from a vehicle lateral direction.SOLUTION: A side frame 322 of a battery case 31 includes a vertical rib 50, a protection region 70 provided at the battery side relative to the vertical rib 50, and a deformation region 60 provided at the opposite side. The deformation region 60 has: a first plate part 51 having a second bending part 51e and connected to a first connection part 50a of the vertical rib 50; a second plate part 52 having a lower bending part 52c provided at the same position as the second bending part 51e when viewed in a vertical direction and connected to a second connection part 50b of the vertical rib 50; and a third plate part 53 connected to the second bending part 51e and a third connection part 50c of the vertical rib 50 and located between the first connection part 50a and the second connection part 50b. A length L1 between the first connection part 50a and the third connection part 50c is shorter than a length L2 between the second connection part 50b and the third connection part 50c.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a battery pack that is mounted under a floor of a vehicle. [Background technology]

[0002] In recent years, efforts to realize a low-carbon or carbon-free society have become more active, and research and development into electrification technologies is being conducted in vehicles to reduce CO2 emissions and improve energy efficiency.

[0003] Batteries play an important role in electrification technology. Because batteries are high-voltage components, they need to be protected from impacts. However, when a battery is installed in a vehicle, there is a possibility that a large load may be input to the battery in the event of a collision or the like. In particular, in the case of a battery pack installed under the floor of a vehicle, the impact is absorbed by the engine room (motor room) or luggage room in the event of a frontal or rear collision, but there is a risk that a large load may be input to the battery pack in the event of a side collision.

[0004] In response to this, Patent Document 1 describes providing an energy absorbing portion on the outside of a side wall of a battery case to protect the battery. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2022-154687 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the structure described in Patent Document 1, when the side wall rotates inward toward the battery due to an impact that cannot be fully absorbed by the energy absorbing part, the side wall may collide with the battery because the side wall is close to the battery. Also, when the side wall rotates outward away from the battery, the bottom plate fixed to the side wall may deform toward the battery and collide with the battery.

[0007] The present invention provides a battery pack capable of adequately protecting a battery against an impact from a lateral direction of the vehicle, such as a side collision. [Means for solving the problem]

[0008] The present invention relates to A battery pack comprising a battery and a battery case that houses the battery, the battery pack being attached under a floor of a vehicle, The battery case includes: A bottom plate on which the battery is placed; a pair of side frames to which the bottom plate is joined and opposed in a vehicle width direction; A cross member connecting the pair of side frames, The side frames are each Vertical ribs and A protective area provided on the battery side from the longitudinal rib; a deformation region provided on the opposite side of the longitudinal rib from the battery, The deformation region includes: A first plate-shaped portion having a first buckling point and connected to a first connection portion of the longitudinal rib; A second plate-shaped portion having a second buckling point provided at the same position as the first buckling point when viewed from the up-down direction and connected to a second connection portion of the vertical rib; a third plate-shaped portion connected to the first buckling point and a third connection portion of the longitudinal rib and located between the first connection portion and the second connection portion; The length of the first connection portion and the third connection portion is shorter than the length of the second connection portion and the third connection portion. Effect of the Invention

[0009] According to the present invention, the battery can be appropriately protected against an impact from the lateral direction of the vehicle, such as a side collision. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a battery pack 1 and an electric vehicle 100 on which the battery pack 1 is mounted. [Diagram 2] FIG. 2 is an exploded oblique view of the battery pack 1. [Diagram 3] FIG. 2 is a plan view showing the internal structure of the battery pack 1. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. [Diagram 5] 4A to 4C are diagrams illustrating deformation modes of a battery case 31 when a load in the lateral direction of the vehicle is input to the battery pack 1. [Figure 6] 1 is a schematic diagram illustrating the rotation of a triangle T formed by deformation. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A battery pack according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0012] As shown in Fig. 1, a battery pack 1 according to one embodiment of the present invention is configured to be mountable under the floor of an electric vehicle 100, such as a hybrid vehicle, an electric vehicle, or a fuel cell vehicle. As shown in Figs. 2 and 3, the battery pack 1 includes four battery modules 10 and a battery case 31 that houses the four battery modules 10. The four battery modules 10 are arranged in two rows in the front-rear direction and two rows in the left-right direction. The number of battery modules 10 can be set arbitrarily as long as it is one or more, and the arrangement is not particularly limited.

[0013] The battery modules 10 are electrically connected to each other via electrical connection members (not shown). The power stored in the battery modules 10 is supplied to a motor or the like that serves as a drive source for the vehicle. In the following description, the four battery modules 10 may be collectively referred to as a battery.

[0014] The battery module 10 is formed, for example, by stacking a plurality of laminated type cells. The laminated type cell has a positive electrode with a positive electrode tab connected, a negative electrode with a negative electrode tab connected, an electrolyte disposed between the positive electrode and the negative electrode, and a laminated film that contains them, and charges and discharges by exchanging ions (e.g., lithium ions) between the positive electrode and the negative electrode via the electrolyte. The cells that constitute the battery module 10 are not limited to the laminated type, and may be can-shaped or cylindrical, and the electrolyte may be liquid or solid.

[0015] The battery case 31 has a battery tray 32 on which a plurality of battery modules 10 are placed, and an upper cover 33 that covers the battery modules 10 from above.

[0016] The battery tray 32 comprises a bottom plate 321 on which the battery module 10 is placed, a pair of side frames 322 provided on both the left and right sides of the bottom plate 321, and a front cross member 333, a central cross member 334, and a rear cross member 335 that connect the pair of side frames 322.

[0017] The front cross member 333 forms a front wall of the battery case 31, and the rear cross member 335 forms a rear wall of the battery case 31. The central cross member 334 divides the interior of the battery case 31 into two spaces, a front space and a rear space. Two battery modules 10 are arranged on the left and right in the front space, and two battery modules 10 are arranged on the left and right in the rear space.

[0018] As shown in FIG. 4, a cover plate is attached below the bottom plate 321, and a water jacket 40 is formed between the bottom plate 321 and the cover plate .

[0019] The side frame 322 will be described in detail below with reference to FIG. As shown in Fig. 4, the side frame 322 includes a vertical rib 50 having a predetermined height and extending in the front-rear direction, a deformation area 60 provided outside the vertical rib 50, i.e., on the opposite side to the battery, and a protection area 70 provided inside the vertical rib 50, i.e., on the battery side. Both the deformation area 60 and the protection area 70 have the function of protecting the battery from loads from the lateral direction of the vehicle, and the protection area 70 is a high-rigidity area that receives input loads due to its rigidity. In contrast, the deformation area 60 absorbs the input load while deforming.

[0020] The protective area 70 comprises an inner frame 71 extending vertically and functioning as the inner wall of the battery accommodating space, an upper frame 72 extending horizontally and connecting the upper end of the inner frame 71 to the upper end of the vertical rib 50, a first middle plate 73 extending horizontally and connecting the lower end of the inner frame 71 to the middle portion of the vertical rib 50, a second middle plate 74 extending horizontally between the upper frame 72 and the first middle plate 73 and connecting the inner frame 71 to the vertical rib 50, and a lower plate 75 extending downward from the widthwise central portion 73a of the first middle plate 73 and then bent outwardly to extend horizontally and connect to the lower end of the vertical rib 50.

[0021] The inner frame 71 and the upper frame 72 are formed to have a greater plate thickness and higher rigidity than other portions. The front cross member 333, the central cross member 334, and the rear cross member 335 described above are joined to the inner frame 71 by welding or the like. Here, the top surface 72a of the inner frame 71 and the top surfaces 336 of the cross members 333 to 335 are set to have the same height in the up-down direction.

[0022] The bottom plate 321 and the cover plate 36 are attached by welding or the like to the lower surface of the inner portion 73b located more inward than the width direction central portion 73a of the first middle plate 73. Hereinafter, the fixed portion between the inner portion 73b of the first middle plate 73 and the bottom plate 321 will be referred to as a joint portion 73c.

[0023] Therefore, when the protective area 70 of the side frame 322 rotates inward (hereinafter also referred to as inward rotation), the bottom plate 321 and the cover plate 36 are accordingly deformed downward, and conversely, when the protective area 70 of the side frame 322 rotates outward (hereinafter also referred to as outward rotation), the bottom plate 321 and the cover plate 36 are accordingly deformed upward. If the bottom plate 321 and the cover plate 36 deform upward, there is a risk that they may interfere with the battery mounted on the bottom plate 321.

[0024] A predetermined gap is formed in the left-right direction between the battery mounted on the bottom plate 321 and the inner frame 71. An area extending in the front-rear direction outside the battery functions as the crash stroke portion 37. In other words, a protective area 70 of the side frame 322 is provided on the periphery of the crash stroke portion 37, and the bottom plate 321 is joined to the side frame 322 at the protective area 70.

[0025] The width W1 of the crash stroke portion 37 is set so that the members constituting the protective area 70 of the side frame 322 will not come into contact with the battery even if the protective area 70 rotates inward, as will be described in detail later. The width W1 of the crash stroke portion 37 is preferably wider than the width W2 of the protective area 70 of the side frame 322.

[0026] The deformation region 60 comprises a first plate-shaped portion 51 extending outward from a first connection portion 50a at the upper end of the vertical rib 50, a second plate-shaped portion 52 extending outward from a second connection portion 50b at the lower end of the vertical rib 50, a third plate-shaped portion 53 extending outward from a third connection portion 50c in the middle of the vertical rib 50 and connected to the first plate-shaped portion 51, and an inner wall portion 54 and an outer wall portion 55 extending in the vertical direction and connecting the first plate-shaped portion 51 and the second plate-shaped portion 52.

[0027] The first plate-like portion 51 includes a gently sloping portion 51a extending obliquely downward from a first connecting portion 50a at the upper end of the vertical rib 50 toward the outside, a steeply sloping portion 51b extending obliquely downward at a steeper slope than the gently sloping portion 51a, an upper horizontal portion 51c disposed outside the steeply sloping portion 51b and extending horizontally toward the outside, a first bent portion 51d connecting the gently sloping portion 51a and the steeply sloping portion 51b, and a second bent portion 51e connecting the steeply sloping portion 51b and the upper horizontal portion 51c. The second bent portion 51e is located above the joint portion 73c.

[0028] The second plate-shaped portion 52 comprises an inclined portion 52a extending diagonally upward and outward from the second connection portion 50b at the lower end of the vertical rib 50, a lower horizontal portion 52b positioned outer than the inclined portion 52a and extending horizontally outward, and a lower bent portion 52c connecting the inclined portion 52a and the lower horizontal portion 52b.

[0029] The third plate-shaped portion 53 extends outward from the third connection portion 50c so as to be located on an extension of the second middle plate 74 of the protective area 70, and is connected to the second bent portion 51e of the first plate-shaped portion 51.

[0030] The first connection portion 50a, the third connection portion 50c, and the second connection portion 50b are arranged in this order from above. The length L1 of the first connection portion 50a and the third connection portion 50c is shorter than the length L2 of the second connection portion 50b and the third connection portion 50c. The length L1 may be shorter than the length L2, but is preferably less than half the length L2.

[0031] The second bent portion 51e connecting the first plate-shaped portion 51 and the third plate-shaped portion 53 and the lower bent portion 52c of the second plate-shaped portion 52 are disposed at the same position in the left-right direction, in other words, at a position overlapping when viewed from above. The inner wall portion 54 connects the second plate-shaped portion 52 and the third plate-shaped portion 53 outside the second bent portion 51e and the lower bent portion 52c, and the outer wall portion 55 connects the outer end of the second plate-shaped portion 52 and the outer end of the third plate-shaped portion 53 further outside the inner wall portion 54.

[0032] Next, a description will be given of the deformation mode of the side frame 322 configured in this manner. Fig. 5 is a diagram illustrating the deformation mode of the battery case 31 when a load in the vehicle lateral direction is input to the battery pack 1. Note that reference numeral 200 in Fig. 5 denotes a cylindrical impact input member.

[0033] When a load in the lateral direction of the vehicle is input to the side frame 322 due to a collision (primary collision), crushing deformation begins in the deformation region 60. As shown in Fig. 5(A) , when the outer wall portion 55 is pressed inward, the first plate-shaped portion 51 and the second plate-shaped portion 52 deform so as to widen the vertical distance between the inner wall portion 54 and the outer wall portion 55, and a load acts on the inside of the inner wall portion 54 so as to narrow the vertical distance between the first plate-shaped portion 51 and the second plate-shaped portion 52.

[0034] Furthermore, when a load in the vehicle lateral direction is input to the side frame 322, as shown in FIG. 5B, the downward load applied to the first plate-shaped portion 51 indicated by the arrow P1 causes the second bent portion 51e to become a buckling point, and the first plate-shaped portion 51 buckles. Also, the upward load applied to the second plate-shaped portion 52 indicated by the arrow P2 causes the lower bent portion 52c to become a buckling point, and the second plate-shaped portion 52 buckles. At this time, since the second bent portion 51e and the lower bent portion 52c are disposed at the same position in the left-right direction (positions where they overlap when viewed from above), they deform to approach each other, and a secondary collision occurs in which the second bent portion 51e and the lower bent portion 52c collide. As a result, as shown in FIG. 5C and FIG. 6, a triangle T is generated in the deformation region 60, with the three sides being the vertical rib 50, the gentle slope portion 51a and the steep slope portion 51b of the first plate-shaped portion 51, and the slope portion 52a of the second plate-shaped portion 52. This triangle T has vertices at the first connection portion 50a, the second connection portion 50b, and the collided second bent portion 51e and lower bent portion 52c.

[0035] Moreover, this triangle T includes two triangles T1 and T2. The first triangle T1 is a triangle whose three sides are the vertical rib 50 between the first connecting portion 50a and the third connecting portion 50c, the gentle slope portion 51a and the steep slope portion 51b of the first plate-shaped portion 51, and the third plate-shaped portion 53. In other words, the first triangle T1 is a triangle whose vertices are the first connecting portion 50a, the third connecting portion 50c, and the collided second bent portion 51e and the lower bent portion 52c.

[0036] The second triangle T2 is a triangle whose three sides are the vertical rib 50 between the second connection portion 50b and the third connection portion 50c, the inclined portion 52a, and the third plate-shaped portion 53. That is, the second triangle T2 is a triangle whose vertices are the second connection portion 50b, the third connection portion 50c, and the colliding second bent portion 51e and lower bent portion 52c.

[0037] Since the length L1 of the first connecting portion 50a and the third connecting portion 50c is set to be shorter than the length L2 of the second connecting portion 50b and the third connecting portion 50c, the area of ​​the first triangle T1 is smaller than the area of ​​the second triangle T2. In other words, in the triangle T, the upper part (triangle T1) has a dense cross section, and the lower part (second triangle T2) has a sparse cross section. If the cross section is dense, it is difficult to be crushed by the load and the load is easily transmitted. On the other hand, if the cross section is sparse, it is easy to be crushed by the load and the load is not easily transmitted. Therefore, a larger load is transmitted to the triangle T1 by the load in the lateral direction of the vehicle acting on the side frame 322, and the protection area 70 is pressed. The arrow P31 in FIG. 6 indicates the load acting on the triangle T1 out of the load P3 in the lateral direction of the vehicle acting on the side frame 322, and the arrow P32 indicates the load acting on the triangle T2 out of the load in the lateral direction of the vehicle acting on the side frame 322. The load P31 is larger than the load P32.

[0038] As a result, the load P3 in the lateral direction of the vehicle acting on the side frame 322 acts to push the triangle T1 inward. Because the triangle T1 is located above the joint 73c, the triangle T1 being pushed inward causes the protected area 70 to rotate inward around the joint 73c as indicated by the dotted line R.

[0039] 5(D), when the protective region 70 of the side frame 322 rotates inward, the bottom plate 321 and the cover plate 36 fixed to the inner portion 73b of the first middle plate 73 are pulled downward, away from the battery, as indicated by arrow Q. This prevents the bottom plate 321 from deforming toward the battery and colliding with the battery.

[0040] Thus, according to the present disclosure, the battery can be appropriately protected against impacts from the vehicle lateral direction, such as a side collision, by controlling the rotation of the side frame 322 caused by the energy that could not be absorbed by the deformation of the deformation region 60. That is, when an impact is input from the vehicle lateral direction, such as a side collision, the buckling points (the second bent portion 51e, the lower bent portion 52c) collide with each other secondary to absorb the energy, and the energy can be efficiently absorbed. In addition, after the secondary collision between the buckling points (the second bent portion 51e, the lower bent portion 52c), the buckling points (the second bent portion 51e, the lower bent portion 52c) located above the joint portion 73c are pushed in the horizontal direction or upward from the horizontal direction by the energy that could not be absorbed, and the protection region 70 of the side frame 322 rotates in the direction approaching the battery module 10. As the side frame 322 rotates toward the inside of the battery case 31, the side frame 322 pushes the bottom plate 321 downward, and the bottom plate 321 is prevented from bending toward the battery module 10. This makes it possible to adequately protect the battery against impacts from the side of the vehicle, such as a side collision.

[0041] Furthermore, since the upper surface 72a of the inner frame 71 and the upper surfaces 336 of the cross members 333 to 335 are set to have the same height in the up-down direction, the amount of deformation of the entire side frame 322 is suppressed, and the amount of rotation of the side frame 322 is also suppressed.

[0042] In addition, since the periphery of the crash stroke portion 37 is joined to the side frame 322 in the protective region 70 of the side frame 322, the weight of the bottom plate 321 can be reduced compared to when the bottom plate 321 is extended to the deformation region 60. In addition, the rotation of the side frame 322 can be more easily controlled compared to when the bottom plate 321 is extended to the deformation region 60. Furthermore, even when the input load is large and the bottom plate 321 is deformed, the crash stroke portion 37 deforms to be downwardly convex, so that the input load can be absorbed while protecting the battery.

[0043] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. Furthermore, the components in the above-mentioned embodiments may be arbitrarily combined within the scope of the invention.

[0044] This specification describes at least the following items. Note that, in parentheses, corresponding components and the like in the above-mentioned embodiment are shown, but the present invention is not limited to these.

[0045] (1) A battery pack (battery pack 1) including a battery (battery module 10) and a battery case (battery case 31) that houses the battery, the battery pack (battery pack 1) being attached under a floor of a vehicle (electrically-driven vehicle 100), The battery case includes: A bottom plate (bottom plate 321) on which the battery is placed; A pair of side frames (side frames 322) to which the bottom plate is joined and which face each other in the vehicle width direction; and cross members (a front cross member 333, a central cross member 334, and a rear cross member 335) that connect the pair of side frames, The side frames are each A vertical rib (vertical rib 50), A protective area (protective area 70) provided on the battery side from the longitudinal rib; A deformation region (deformation region 60) is provided on the opposite side of the longitudinal rib from the battery, The deformation region includes: a first plate-shaped portion (first plate-shaped portion 51) having a first buckling point (second bent portion 51e) and connected to a first connecting portion (first connecting portion 50a) of the longitudinal rib; a second plate-shaped portion (second plate-shaped portion 52) having a second buckling point (lower bent portion 52c) provided at the same position as the first buckling point when viewed from the up-down direction and connected to a second connecting portion (second connecting portion 50b) of the vertical rib; a third plate-shaped portion (third plate-shaped portion 53) connected to the first buckling point and a third connection portion (third connection portion 50c) of the longitudinal rib and located between the first connection portion and the second connection portion, the length (length L1) of the first connection portion and the third connection portion is shorter than the length (length L2) of the second connection portion and the third connection portion of the battery pack.

[0046] According to (1), when a collision (primary collision) from the side of the vehicle occurs, that is, a so-called side collision, the buckling points collide with each other in a secondary manner, and energy can be efficiently absorbed. In addition, after the secondary collision between the buckling points, the buckling points located above the joint between the bottom plate and the side frame are pushed inward by the energy that cannot be fully absorbed, and the protective area of ​​the side frame rotates in a direction approaching the battery. As the side frame rotates toward the inside of the battery case, the side frame presses the bottom plate downward, and the bottom plate is prevented from bending toward the battery. In this way, by controlling the rotation of the side frame due to the energy that cannot be fully absorbed by the deformation of the deformation area, the battery can be appropriately protected against impacts from the side of the vehicle, such as a side collision.

[0047] (2) A battery pack according to (1), The cross member is A front cross member (front cross member 333) located in front of the battery pack; A rear cross member (rear cross member 335) located behind the battery pack; A center cross member (center cross member 334) located between the front cross member and the rear cross member, Each cross member is joined to the side frame, A battery pack in which, at the positions where the cross members and the side frames are joined, the upper surfaces (upper surfaces 336) of the cross members and the upper surfaces (upper surfaces 72a) of the protective areas of the side frames are at the same height in the vertical direction.

[0048] According to (2), the amount of deformation of the entire side frame is suppressed, and the amount of rotation of the side frame is also suppressed.

[0049] (3) A battery pack according to (1) or (2), The bottom plate has a crash stroke portion (crash stroke portion 37) extending in the vehicle front-rear direction outside the battery, A battery pack, wherein a periphery of the crash stroke portion is joined to the side frame at the protective region of the side frame.

[0050] According to (3), the weight of the bottom plate can be reduced compared to when the bottom plate is extended to the deformation region. In addition, the rotation of the side frame can be more easily controlled compared to when the bottom plate is extended to the deformation region. Furthermore, even when the input load is large and the bottom plate is deformed, the crush stroke portion deforms to be convex downward because the periphery of the crush stroke portion of the bottom plate and the side frame that rotates inward are joined. This makes it possible to protect the battery while absorbing the input load.

[0051] (4) A battery pack according to (3), The width (width W1) of the crash stroke portion is wider than the width (width W2) of the protection area of ​​the side frame.

[0052] According to (4), when the side frame rotates toward the inside of the case, it is possible to prevent the side frame from interfering with the battery. [Explanation of symbols]

[0053] 1 Battery pack 10 Battery module (battery) 31 Battery case 37 Crash stroke section 50 Vertical ribs 50a First connection part 50b Second connection part 50c 3rd connection part 51 First plate-shaped part 51e 2nd bending part (1st buckling point) 52 Second plate-shaped portion 52c Lower bending part (second buckling point) 53 Third plate-shaped part 60 Deformation Area 70 Protected area 100 Electric vehicles (vehicles) 321 Bottom Plate 322 Side Frame 333 Front cross member 334 Center cross member (middle cross member) 335 Rear cross member

Claims

1. A battery pack comprising a battery and a battery case that houses the battery, the battery pack being attached under a floor of a vehicle, The battery case includes: A bottom plate on which the battery is placed; a pair of side frames to which the bottom plate is joined and opposed in a vehicle width direction; A cross member connecting the pair of side frames, The side frames are each Vertical ribs and A protective area provided on the battery side from the longitudinal rib; a deformation region provided on the opposite side of the longitudinal rib from the battery, The deformation region includes: A first plate-shaped portion having a first buckling point and connected to a first connection portion of the longitudinal rib; A second plate-shaped portion having a second buckling point provided at the same position as the first buckling point when viewed from the up-down direction and connected to a second connection portion of the vertical rib; a third plate-shaped portion connected to the first buckling point and a third connection portion of the longitudinal rib and located between the first connection portion and the second connection portion; A battery pack, wherein a length of the first connection portion and the third connection portion is shorter than a length of the second connection portion and the third connection portion.

2. 2. The battery pack according to claim 1, The cross member is a front cross member located in front of the battery pack; a rear cross member located behind the battery pack; a middle cross member located between the front cross member and the rear cross member, Each cross member is joined to the side frame, A battery pack, wherein at positions where the cross members and the side frames are joined, the upper surfaces of the cross members and the upper surfaces of the protective areas of the side frames are at the same height in the up-down direction.

3. 3. The battery pack according to claim 1, the bottom plate has a crash stroke portion extending in a front-rear direction of the vehicle outside the battery, A battery pack, wherein a periphery of the crash stroke portion is joined to the side frame at the protective region of the side frame.

4. 4. The battery pack according to claim 3, The width of the crash stroke portion is wider than the width of the protective area of ​​the side frame.

Images