Battery cell packaging device and battery cell assembly

Abstract

The utility model describes a battery cell packaging device and a battery cell assembly, the battery cell packaging device comprises: a frame body which is of an enclosed structure and comprises a first side surface and a second side surface which are opposite to each other along the height direction of the frame body; the separators are connected into the frame body and divide the internal space of the frame body into a plurality of accommodating spaces, and the accommodating spaces penetrate through the frame body in the height direction and are used for placing battery cells; wherein the separator comprises a first end part facing the plane where the first side surface is located, the separator further comprises a second end part facing the second side surface, and an avoiding space exists between the first end part and / or the second end part and the end part area of the battery cell. Therefore, the first end part and / or the second end part of the separator are / is not in contact with the edge of the blue film in the end part area of the battery cell, so that the first end part and / or the second end part can be prevented from rubbing the edge of the blue film as far as possible in the transportation process of the battery cell due to bumping and the like, and the risk of tilting of the blue film is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery core packaging device and a battery core assembly. Background Art

[0002] To ensure product quality, the battery cells must be adequately protected during transportation.

[0003] Typically, battery cells are packed in boxes with protective linings, such as foam boards, to protect them from collisions and crushing during transport. However, the outer surface of the battery cells is covered with a layer of blue film. When the battery is bumpy during transport, friction between the protective lining and the blue film can cause the edges of the blue film to warp, affecting the performance of the battery cells. Utility Model Content

[0004] In view of the above existing situation, the present invention provides a battery cell packaging device and a battery cell assembly to reduce the risk of the battery cell blue film warping.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a battery cell packaging device, which includes: a frame body, which is an enclosed structure, and along the height direction of the frame body, the frame body includes a first side surface and a second side surface that are opposite to each other; a separator, which is connected to the frame body and divides the internal space of the frame body into multiple accommodating spaces, and the accommodating spaces pass through the height direction of the frame body, and the accommodating spaces are used to place battery cells; wherein, the separator includes a first end portion facing the plane where the first side surface is located, and the separator also includes a second end portion facing the second side surface, and there is an avoidance space between the first end portion and / or the second end portion and the end area of the battery cell.

[0006] In the battery cell packaging device involved in the utility model, optionally, the first end portion and / or the second end portion is provided with an avoidance groove to form the avoidance space, and the avoidance groove is communicated with the accommodating space.

[0007] In the battery cell packaging device involved in the utility model, optionally, the first end portion is located on a side of the plane where the first side surface is located that faces the second side surface, and is spaced apart from the plane where the first side surface is located.

[0008] In the battery cell packaging device involved in the utility model, optionally, the distance between the first end and the plane where the first side surface is located is d, and 15 mm ≤ d ≤ 20 mm.

[0009] In the battery cell packaging device involved in the utility model, optionally, a notch is formed at the second end portion; and the notch is communicated with the accommodating space.

[0010] In the battery cell packaging device involved in the utility model, optionally, at least part of the accommodating spaces are arranged in sequence; the separator includes a second end facing the second side surface, the second end is provided with a notch, and the notch passes through the second end to connect two adjacent accommodating spaces.

[0011] In the battery cell packaging device involved in the utility model, optionally, along the height direction of the frame, the depth of the notch is between 2 cm and 4 cm.

[0012] In the battery cell packaging device involved in the utility model, optionally, the frame and / or the separator are made of pearl cotton or EVA foam; and / or the frame and the separator are integrally formed.

[0013] In the battery cell packaging device involved in the utility model, optionally, the thickness of the frame is greater than or equal to the width of the battery cell; and / or the thickness of the separator is greater than or equal to the width of the battery cell.

[0014] A second aspect of the present invention provides a battery cell assembly, comprising: the battery cell packaging device as described above; and a battery cell, wherein the battery cell is installed in a receiving space of the battery cell packaging device.

[0015] In the battery cell assembly involved in the utility model, optionally, the battery cell includes an end face facing the plane where the first side face is located, and the end face is at least partially staggered with the first end portion.

[0016] In the battery cell assembly involved in the utility model, optionally, the end face of the battery cell close to the plane where the first side surface is located is coplanar with the first side surface.

[0017] In the battery cell assembly involved in the utility model, optionally, the battery cell includes a shell; the height of the shell is H, the height of the frame is h1, H≤h1; and / or the separator includes a second end facing the second side surface, and the height from the plane where the first side surface is located to the second end surface is h2, H≤h2.

[0018] The battery cell packaging device involved in the present invention includes a frame and a separator, wherein the separator divides the internal space of the frame into a plurality of storage spaces, the frame includes a first side surface and a second side surface that are opposite to each other, the storage spaces are continuous in the height direction of the frame, and the first side surface is used to be placed on an external support. Since when the battery cell is located in the storage space, there is an avoidance space between the first end and / or the second end and the end region of the battery cell, thereby, the first end and / or the second end of the separator can avoid contacting the edge of the blue film of the end region of the battery cell. During the transportation of the battery cell, the first end and / or the second end can avoid friction with the edge of the blue film of the battery cell due to bumps and the like as much as possible, thereby reducing the risk of the blue film warping. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0020] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0021] Figure 1 Schematic diagram showing the overall structure of the battery cell packaging device involved in this application.

[0022] Figure 2 It is a schematic diagram showing the overall structure of the battery cell assembly involved in this application.

[0023] Figure 3 2 is another schematic diagram showing the overall structure of the battery cell packaging device involved in the present application.

[0024] Figure 4 1 is a schematic diagram showing the overall structure of another embodiment of the battery cell packaging device involved in the present application.

[0025] Figure 5 1 is another overall structural schematic diagram showing another embodiment of the battery cell packaging device involved in the present application.

[0026] Figure 6 is a cross-sectional view showing the battery cell packaging device according to the present application.

[0027] Figure 7 is a cross-sectional view showing another embodiment of the battery cell packaging device involved in the present application.

[0028] Figure 8Schematic diagram showing the overall structure of the battery cell involved in this application.

[0029] Figure 9 is a cross-sectional view showing another embodiment of the battery cell packaging device involved in the present application.

[0030] Figure numerals: 10, battery cell packaging device; 20, battery cell; 201, shell; 202, pole; 1, frame; 11, first side; 12, second side; 2, separator; 21, first end; 211, avoidance groove; 22, second end; 221, notch; 2211, groove; 2212, through groove; 3, accommodating space. DETAILED DESCRIPTION

[0031] Below, with reference to the accompanying drawings, the preferred embodiments of the present application are described in detail. In the following description, the same symbols are given to the same components, and repeated descriptions are omitted. In addition, the accompanying drawings are only schematic diagrams, and the ratio of the dimensions of the components to each other or the shapes of the components may be different from the actual ones. It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0032] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0033] With the continued expansion of new energy power applications, the demand for battery cells continues to grow. To ensure product quality, battery cells must be adequately protected during transportation. Typically, battery cells are equipped with protective linings such as foam boards in packaging boxes to protect the battery cells from collisions or squeezing during transportation. However, the outer surface of the battery cell is covered with a layer of blue film. When there is bumpy transportation, friction will occur between the protective lining and the blue film, which can easily cause the edge of the blue film to warp, affecting the performance of the battery cell.

[0034] Reference Figures 1 to 3In the first aspect of the present application, there is provided a battery cell packaging device 10, which includes a frame 1 and a separator 2. The frame 1 is an enclosed structure. Along the height direction of the frame 1, the frame 1 includes a first side surface 11 and a second side surface 12 relative to each other. The first side surface 11 is used to be placed on an external support. The separator 2 is connected to the frame 1 and divides the internal space of the frame 1 into a plurality of accommodating spaces 3. The accommodating spaces 3 pass through the height direction of the frame 1, and the accommodating spaces 3 are used to place battery cells 20. The separator 2 includes a first end 21 facing the plane where the first side surface 11 is located, and the separator 2 also includes a second end 22 facing the second side surface 12. There is an avoidance space between the first end 21 and / or the second end 22 and the end area of the battery cell 20.

[0035] Specifically, the first side surface 11 can be used to be placed on an external support. Since there is a clearance space between the first end 21 and / or the second end 22 and the end area of the battery cell 20 when the battery cell 20 is located in the accommodating space 3, the first end 21 and / or the second end 22 of the separator 2 can avoid contacting the edge of the blue film of the battery cell 20. During the transportation of the battery cell 20, the first end 21 is prevented from rubbing against the edge of the blue film of the battery cell 20 due to bumps and other conditions as much as possible, thereby reducing the risk of the blue film warping.

[0036] In the related art, the blue film of the battery cell 20 can be arranged in various ways. For example, the edge of the blue film can be close to the end of the battery cell 20 and located in the side area of the battery cell 20. In some cases, the bottom edge of the blue film is also flush with the end of the battery cell 20. Because the edge of the blue film near the end area of the battery cell 20 is often prone to warping during the transportation of the battery cell 20, the end area defined in this application can include both ends of the battery cell 20 in the height direction, and can also include the side areas near both ends of the battery cell.

[0037] It can be understood that in the present application, there may be an avoidance space between the first end 21 and the end area of the battery cell 20, there may be an avoidance space between the second end 22 and the end area of the battery cell 20, or there may be an avoidance space between the first end 21 and the second end 22 and the end area of the battery cell 20.

[0038] Reference Figure 9 As an embodiment, the first end portion 21 and / or the second end portion 22 is provided with an escape groove 211 to form an escape space, and the escape groove 211 is connected to the accommodating space 3. Thus, after the battery cell 20 is placed, the area of the battery cell 20 located in the escape groove 211 will not contact the separator 2. Specifically, when the escape groove 211 is provided at the first end portion 21, the opening range of the escape groove 211 can extend from the first end portion 21 toward the second end portion 22. The opening range of the escape groove 211 is sufficient to ensure that the bottom of the blue film of the battery cell 20 is not rubbed.

[0039] As an embodiment, the first end portion 21 is located on the side of the plane where the first side surface 11 is located facing the second side surface 12, and is spaced apart from the plane where the first side surface 11 is located. Therefore, in this embodiment, the avoidance space is the space between the plane where the first end portion 21 is located and the plane where the first side surface 11 is located. When the battery cell packaging device 10 is in use, the staff puts the battery cell 20 into the accommodating space 3. At this time, the battery cell 20 is placed in the direction of the first side surface 11 through the second side surface 12. Usually, under the action of gravity, the end of the battery cell 20 will also be placed on the external support. Since the separator 2 includes the first end portion 21 facing the plane where the first side surface 11 is located, the first end portion 21 is located on the side of the plane where the first side surface 11 is located facing the second side surface 12, and is spaced apart from the plane where the first side surface 11 is located, according to this structure, there is also a gap between the first end portion 21 and the end area of the battery cell 20 after being placed in the accommodating space. As a result, the first end 21 of the separator 2 does not contact the edge of the blue film in the end area of the battery cell 20, so that during the transportation of the battery cell 20, the first end 21 can be prevented from rubbing against the edge of the blue film of the battery cell due to bumps and the like as much as possible, thereby reducing the risk of the blue film warping.

[0040] In other embodiments, the second end portion 22 may also be located on the side of the plane of the second side surface 12 that faces the first side surface, and spaced apart from the plane of the second side surface 12. Thus, the second end portion 22 will not rub against the end region of the battery cell. Thus, during transportation of the battery cell, the second end portion 22 is prevented from rubbing against the edge of the blue film of the battery cell 20 due to bumps and the like, thereby reducing the risk of the blue film warping.

[0041] The protective lining in the related art usually has the same height as the frame 1 and the partition 2. According to the above structure, the height of the partition 2 set in this embodiment is less than the height of the frame 1. This not only prevents the partition 2 from rubbing the blue film, but also reduces the material used for the partition 2, thereby reducing costs.

[0042] Reference Figure 3 and Figure 6 As an embodiment, the spacing distance between the first end 21 and the plane where the first side surface 11 is located is d, 15mm≤d≤20mm. In the related art, the bottom edge of most of the blue films of the battery cells 20 is usually also close to the end of the battery cell 20, such as located on the side near the end of the battery cell 20. The bottom edge of some blue films is also flush with the end of the battery cell 20. Therefore, the spacing distance d set in this embodiment is to reserve sufficient space between the first end 21 and the plane where the first side surface 11 is located, so as to avoid the first end 21 rubbing against the bottom edge of the blue film, causing the edge of the blue film to curl up.

[0043] In some examples, the distance between the first end portion 21 and the plane where the first side surface 11 is located can be set to one of 15 mm, 16 mm, 17.5 mm, 19 mm, and 20 mm.

[0044] Reference Figure 1 、 Figure 2 and Figure 4 As an embodiment, the separator 2 includes a second end 22 facing the second side surface 12. The second end 22 defines a notch 221, which communicates with the accommodating space 3. It is understood that the notch 221 allows a worker to access the discharge cell 20. Therefore, in related art, protective liners typically lack a structure for workers to access the cell. This embodiment solves the problem of inconvenience for workers when accessing the discharge cell.

[0045] In some examples, the notch 221 may not connect two adjacent accommodating spaces 3 , that is, the notch 221 only needs to form a recessed space that can accommodate the end of a human finger, so that the staff can insert their fingers to take the battery cell 20 .

[0046] Reference Figure 1 and Figure 4 As an embodiment, at least part of the accommodating spaces 3 are arranged in sequence; the separator 2 includes a second end portion 22 facing the second side surface 12, and the second end portion 22 is provided with a notch 221, which passes through the second end portion 22 to connect two adjacent accommodating spaces 3. The accommodating spaces 3 are arranged in sequence, which can be understood as when the battery cell packaging device 10 is placed horizontally on an external support, the accommodating spaces 3 are arranged in an array in the X direction and the Y direction perpendicular to the water surface. Figure 1 In the X direction, multiple accommodating spaces 3 can be arranged in two columns, and in the Y direction, multiple accommodating spaces 3 can be arranged in ten rows. Thus, the battery cell packaging device 10 can place the battery cells 20 in a more orderly manner. In addition, the notch 221 passes through the second end portion 22, which can reduce the material used for the separator 2 and save costs.

[0047] Reference Figures 1 to 3 ,as well as Figure 6 In some examples, the notch 221 is configured as a groove 2211. The groove 2211 is recessed from the plane of the second side surface 12 toward the plane of the first side surface 11. To facilitate the manufacture of the battery cell packaging device 10, in some examples, the groove 2211 may be a square space. In other examples, the groove 2211 may also be an arc-shaped space.

[0048] Reference Figure 4 、 Figure 5 and Figure 7In some examples, the notch 221 may be in the form of a through-slot 2212 that passes through the first end 21 and the second end 22. Thus, the through-slot 2212 can further reduce the material used in the separator 2 and save costs.

[0049] It is understood that when the notch 221 is configured as a groove 2211, the separator 2 can provide better support for the battery cell 20 placed in the accommodating space 3, while when the notch 221 is configured as a through-slot 2212, the separator 2 provides slightly weaker support for the battery cell 20. Therefore, a battery cell packaging device 10 with the notch 221 configured as a groove 2211 is more suitable for battery cells 20 with a higher height and weight; a battery cell packaging device 10 with the notch 221 configured as a through-slot 2212 is more suitable for battery cells 20 with a lower height and weight. Among common battery cell 20 specifications, battery cells 20 with a height of 100 mm or more can choose to use a battery cell packaging device 10 with a notch 2211 structure; battery cells 20 with a height of less than 100 mm can choose to use a battery cell packaging device 10 with a notch 2212 structure.

[0050] As an embodiment, the depth of the notch 221 along the height direction of the frame 1 is between 2 cm and 4 cm. Specifically, when the notch 221 is a groove 2211, the depth of the groove 2211 is between 2 cm and 4 cm. Of course, in some examples, the depth of the through groove 2212 can also be between 2 cm and 4 cm.

[0051] In some examples, the depth of the notch 221 may be 2 cm, 3 cm, or 4 cm.

[0052] It is understandable that when the staff puts the battery cell 20, they can tilt the battery cell 20 slightly and enter from the notch 221, and then put the battery cell 20 as a whole into the accommodation space first, thereby avoiding the battery cell 20 being placed vertically and the blue film being lifted.

[0053] As an embodiment, the frame 1 and / or separator 2 are made of pearl cotton or EVA foam. Pearl cotton is also known as EPE foam. Therefore, pearl cotton and EVA foam effectively absorb impact and provide cushioning protection, effectively protecting the battery cells 20 from damage during transportation and handling. It is understood that after packing, the multiple battery cells and the cell packaging device squeeze against the pearl cotton cell packaging device, providing sufficient structural support to ensure stability during transportation.

[0054] As an embodiment, the frame 1 and the separator 2 are integrally formed. Thus, the battery cell packaging device 10 does not require a complicated assembly process, and the integrally formed battery cell packaging device 10 is more compact in structure, can improve the overall strength and stability, and provide more reliable protection for the battery cells 20.

[0055] As one embodiment, the thickness of the frame 1 is greater than or equal to the width of the battery cell 20. Thus, the frame 1, made of a cushioning material such as pearl cotton, can better withstand external impacts, thereby providing better protection for the battery cell 20 placed in the accommodating space 3. As another embodiment, the thickness of the separator 2 is greater than or equal to the width of the battery cell 20. Thus, the separator 2, made of a cushioning material such as pearl cotton, can better withstand external impacts and can also resist mutual compression between the battery cells 20, thereby providing better protection for the battery cell 20 placed in the accommodating space 3.

[0056] Reference Figure 2 The second aspect of the present application provides a battery cell assembly, which includes: the battery cell packaging device 10 as described above; and a battery cell 20 , wherein the battery cell 20 is installed in the accommodating space 3 of the battery cell packaging device 10 .

[0057] Reference Figure 3 As an embodiment, the battery cell 20 includes a bottom surface facing the plane of the first side surface 11, and the bottom surface is at least partially offset from the first end portion 21. Thus, the bottom surface of the battery cell 20 is not coplanar with the first end portion 21, and the first end portion 21 does not contact the bottom edge of the blue film of the battery cell 20. This minimizes friction between the first end portion 21 and the bottom edge of the blue film due to bumps during transportation of the battery cell 20, thereby reducing the risk of the blue film warping.

[0058] Reference Figure 3 As an embodiment, the bottom surface of the battery cell 20 close to the plane where the first side surface 11 is located is coplanar with the first side surface 11. When the first side surface 11 is placed on an external support, the bottom surface of the battery cell 20 can also be placed on the external support.

[0059] Reference Figure 8 In a lithium battery or other types of rechargeable batteries, the positive and negative poles 202 are usually located at the same end of the shell 201 , and the poles 202 protrude from the shell 201 .

[0060] As an embodiment, the battery cell 20 includes a housing 201. The height of the housing 201 is H, and the height of the frame 1 is h1, where H≤h1. Thus, the height of the frame 1 can be made consistent with that of the housing 201, or higher than that of the housing 201, thereby fully protecting the housing 201.

[0061] As another embodiment, the separator 2 includes a second end 22 facing the second side surface 12, and the height from the plane of the first side surface 11 to the second end 22 is h2, where H ≤ h2. Thus, when H = h2 = h1, the second end 22, the second side surface 12, and the top of the housing 201 facing the second side surface 12 can all be on the same plane, thereby allowing the separator 2 and the frame 1 to more fully wrap around the housing 201 and better protect the housing 201.

[0062] In some embodiments, when h1=h2 and H

[0063] In some examples, the second end portion 22 of the separator 2 and the second side surface 12 of the frame 1 may both be 0.5 cm to 1 cm lower than the pole.

[0064] In the battery cell packaging device 10 involved in the present application, since there is a clearance space between the first end 21 and / or the second end 22 and the end region of the battery cell 20 when the battery cell 20 is located in the accommodating space 3, the first end 21 and / or the second end 22 of the separator 2 can avoid contacting the edge of the blue film in the end region of the battery cell 20. During transportation of the battery cell 20, the first end 21 is prevented from rubbing against the bottom edge of the blue film of the battery cell 20 due to bumps and the like as much as possible, thereby reducing the risk of the blue film warping. In addition, compared to traditional protective linings, the separator 2 provided in the present application reduces material consumption and thus reduces costs.

[0065] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0066] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0067] ​The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0068] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

[0069] Although the present invention has been described in detail above with reference to the accompanying drawings and embodiments, it should be understood that the above description does not limit the present invention in any form. Those skilled in the art may modify and alter the present invention as needed without departing from the spirit and scope of the present invention, and such modifications and alterations are intended to fall within the scope of the present invention.

Claims

1. A battery cell packaging device, characterized in that: include: The frame is an enclosed structure, and along the height direction of the frame, the frame includes a first side surface and a second side surface that are opposite to each other; A separator connected to the frame body and dividing the internal space of the frame body into a plurality of accommodating spaces, the accommodating spaces being continuous in the height direction of the frame body and being used for placing battery cells; The separator includes a first end facing the plane where the first side surface is located, and the separator also includes a second end facing the second side surface. There is an avoidance space between the first end and / or the second end and the end area of the battery cell.

2. The battery cell packaging device according to claim 1, characterized in that: The first end portion and / or the second end portion is provided with an avoidance groove to form the avoidance space, and the avoidance groove is communicated with the accommodating space.

3. The battery cell packaging device according to claim 1, characterized in that: The first end portion is located on a side of the plane where the first side surface is located that faces the second side surface, and is spaced apart from the plane where the first side surface is located.

4. The battery cell packaging device according to claim 3, characterized in that: The distance between the first end and the plane where the first side surface is located is d, and 15 mm ≤ d ≤ 20 mm.

5. The battery cell packaging device according to claim 1, characterized in that: The second end portion is provided with a notch; The notch is communicated with the accommodating space.

6. The battery cell packaging device according to claim 1, characterized in that: At least some of the accommodating spaces are arranged sequentially; The partition includes a second end portion facing the second side surface. The second end portion is provided with a notch. The notch passes through the second end portion to connect two adjacent accommodating spaces.

7. The battery cell packaging device according to claim 5 or 6, characterized in that: Along the height direction of the frame, the depth of the notch is between 2 cm and 4 cm.

8. The battery cell packaging device according to any one of claims 1 to 6, characterized in that: The frame and / or the separator are made of pearl cotton or EVA foam; And / or, the frame and the partition are integrally formed.

9. The battery cell packaging device according to any one of claims 1 to 6, characterized in that: The thickness of the frame is greater than or equal to the width of the battery cell; and / or, The thickness of the separator is greater than or equal to the width of the battery cell.

10. A battery cell assembly, characterized in that: include: The battery cell packaging device according to any one of claims 1 to 9; A battery cell is installed in the accommodating space of the battery cell packaging device.

11. The battery core assembly according to claim 10, characterized in that: The battery core includes an end face facing the plane where the first side face is located, and the end face is at least partially staggered with the first end portion.

12. The battery core assembly according to claim 10, characterized in that: An end surface of the battery cell close to the plane where the first side surface is located is coplanar with the first side surface.

13. The battery core assembly according to claim 10, characterized in that: The battery cell includes a shell; The height of the shell is H, the height of the frame is h1, H≤h1; and / or, The separator includes a second end portion facing the second side surface, and a height from a plane where the first side surface is located to the second end portion is h2, where H≤h2.

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