Metal sheet for low-temperature liquefied gas storage device
By designing a complex pleated corrugated structure on a thin metal sheet, the problems of poor thermal stress relief and insufficient sealing in existing technologies have been solved, achieving better thermal stress relief and improved sealing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU SUNPOWER TECH
- Filing Date
- 2025-07-07
- Publication Date
- 2026-06-12
AI Technical Summary
Existing GTT thin-film technology has limited effectiveness in alleviating thermal stress in cryogenic liquefied gas storage devices, and the sealing performance is insufficient after splicing metal sheets.
A thin metal sheet structure is designed, including first and second corrugated patterns on a metal substrate, and a flared section on the second corrugated pattern. The first and second corrugated patterns are arranged alternately, which increases the structural features to alleviate thermal stress, and the flared section enables convenient splicing and ensures airtightness.
It improves the effect of relieving thermal stress, ensures the airtightness of the tank after the metal sheets are spliced, avoids warping and deformation, and enhances the structural stability and airtightness of the storage device.
Smart Images
Figure CN224352772U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cryogenic storage technology, and in particular to a thin metal plate for a cryogenic liquefied gas storage device. Background Technology
[0002] With the continuous changes in energy demand, the proportion of clean energy in the energy structure is constantly increasing. Liquefied natural gas (LNG) and liquid hydrogen, as important forms of clean energy, have certain advantages in storage and transportation due to their smaller volume in their liquefied state. However, because liquefied gases have low boiling points, they need to be stored in extremely low-temperature environments. Storing cryogenic liquid gases requires corresponding technologies. Currently, various types of storage tanks are commonly used for storage. Traditional LNG storage tanks include single-containment tanks, double-containment tanks, and full-containment tanks. Newer types, such as thin-film metal tanks with thin-film metal plates as the inner tank material, are also emerging.
[0003] Membrane tanks utilize thin metal sheets to offset the stress caused by thermal changes in cryogenic liquefied gases. The inner and outer walls are connected to the outer wall via thermal insulation materials, and the outer wall uses structures such as concrete brick walls to withstand the static internal pressure caused by the liquid. Most existing membrane tanks use a technology invented by GTT in France for their inner wall metal sheets, which effectively solves the deformation problem caused by thermal expansion and contraction. Current GTT membrane technology creates intersecting corrugations, with corrugated joints formed at the intersections; the corrugations are formed by compression and contraction.
[0004] The intersecting corrugations facilitate the splicing of thin metal sheets, resulting in good sealing of the tank after splicing. The structure, shape, and forming quality of the corrugated metal sheets play an important role in mitigating thermal stress caused by low temperatures. However, the existing GTT thin film technology for forming intersecting corrugations is too simplistic in terms of structure and shape, thus limiting its effectiveness in mitigating thermal stress caused by low temperatures. Utility Model Content
[0005] The purpose of this invention is to provide a thin metal sheet for a cryogenic liquefied gas storage device, which has richer structural features, is easy to splice, and has a good effect on relieving thermal stress.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] This utility model provides a thin metal sheet for a cryogenic liquefied gas storage device, the thin metal sheet for the cryogenic liquefied gas storage device comprising:
[0008] metal substrate;
[0009] The first pleated corrugation, the metal substrate is provided with two first pleated corrugations spaced apart along a first direction;
[0010] The second pleated corrugation has two spaced-apart second pleated corrugations on each side of the two first pleated corrugations that are opposite to each other, arranged along a second direction. Each second pleated corrugation includes a connecting section and a flared section. The connecting section intersects with the first pleated corrugations, and its height along a third direction is lower than that of the first pleated corrugations. The flared section is located on the side of the connecting section opposite to the first pleated corrugations, and its cross-sectional area gradually increases in the direction away from the connecting section. The port of the flared section opposite to the connecting section has the same size as the port of the first pleated corrugations. The flared section is used to dock with the first pleated corrugations of another sheet of metal.
[0011] Optionally, the width dimension of the first pleated ripple along the first direction is W1, and the height dimension of the first pleated ripple along the third direction is H1, and satisfies 1.2≤H1 / W1≤1.6.
[0012] Optionally, the metal substrate has a flat posture and a curved posture. When the metal substrate is in the curved posture, a blank area for bending is provided between the two first folds. The length of the blank area along the first direction is L, and L > 2H1.
[0013] Optionally, the height dimension of the connecting segment along the third direction is H2, and the ratio between the height dimension H2 of the connecting segment along the third direction and the height dimension H1 of the first pleated corrugation along the third direction satisfies 0.65≤H2 / H1≤0.75.
[0014] Optionally, the width dimension of the connecting segment along the second direction is W2, and the ratio between the height dimension H2 of the connecting segment along the third direction and the width dimension W2 of the connecting segment along the second direction satisfies 1.5≤H2 / W2≤1.9.
[0015] Optionally, the metal sheet for the cryogenic liquefied gas storage device further includes a third corrugated pattern, and the blank area is provided with two third corrugated patterns that correspond one-to-one with the second corrugated pattern and intersect with the first corrugated pattern.
[0016] Optionally, the first pleated corrugation has a first recessed structure, which is located at the connection between the first pleated corrugation and the third pleated corrugation.
[0017] Optionally, the first pleated corrugation is provided with a second recessed structure, which is located at the connection between the first pleated corrugation and the second pleated corrugation.
[0018] Optionally, the first corrugated ridge has a third recessed structure, which is disposed on the surface of the first corrugated ridge away from the metal substrate in the third direction.
[0019] Optionally, the third recessed structure is provided in the region between the two second folded corrugations of the first folded corrugation;
[0020] And / or, the first pleated ripple is provided with the third recessed structure in two regions of the two second pleated ripples that are opposite to each other.
[0021] The beneficial effects of this utility model are:
[0022] This invention provides a metal sheet for a cryogenic liquefied gas storage device. By setting two first corrugated patterns spaced apart along a first direction on a metal substrate, and two second corrugated patterns spaced apart along a second direction on the opposite side of the first corrugated patterns, and ensuring the height of the first corrugated patterns is greater than the connecting section of the second corrugated patterns, the structural features for mitigating thermal stress caused by low temperatures are enriched, improving the effect of mitigating thermal stress. Furthermore, by setting flared sections in the second corrugated patterns, and ensuring that the flared sections have the same dimensions as the ports of the first corrugated patterns, it is not only convenient to splice different metal sheets, ensuring good sealing inside the tank after splicing, but also that the spliced metal sheets are arranged at 90° staggered intervals, ensuring the symmetry of thermal stress over a large area and preventing warping deformation of the overall structure, thereby further improving the sealing inside the tank after splicing. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of the metal sheet for the cryogenic liquefied gas storage device provided by this utility model, which is in a flat position without the third fold or corrugation.
[0024] Figure 2 This is a schematic diagram of the structure of the metal sheet for the cryogenic liquefied gas storage device provided by this utility model, which is in a curved posture and without the third fold or corrugation.
[0025] Figure 3 This is a schematic diagram of the structure of the metal sheet for the cryogenic liquefied gas storage device provided by this utility model, which is in a flat position with a third fold and corrugation.
[0026] Figure 4 This is a schematic diagram of the structure of the metal sheet of the cryogenic liquefied gas storage device provided by this utility model, which is in a curved posture with a third fold and corrugation.
[0027] Figure 5 This is a schematic diagram of the splicing of multiple thin metal plates for cryogenic liquefied gas storage devices provided by this utility model in a flat position;
[0028] Figure 6 This is a cross-sectional view of the first folded corrugation in the metal sheet for multiple cryogenic liquefied gas storage devices provided by this utility model.
[0029] Figure 7 This is a cross-sectional view of the connecting section on the second corrugated section of the metal sheet used in multiple cryogenic liquefied gas storage devices provided by this utility model.
[0030] Figure 8 This is a stress cloud diagram of the metal sheet of several cryogenic liquefied gas storage devices provided by this utility model.
[0031] In the picture:
[0032] 100. Blank space;
[0033] 1. Metal substrate;
[0034] 2. First fold ripple;
[0035] 3. Second fold ripple; 31. Connecting section; 32. Flared section;
[0036] 4. Third fold ripple;
[0037] 5. First indented structure;
[0038] 6. Second indentation structure;
[0039] 7. Third indentation structure. Detailed Implementation
[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0043] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0044] To alleviate the thermal stress caused by low temperatures and ensure the airtightness of the tank after the metal sheets are spliced together, this embodiment provides a metal sheet for a cryogenic liquefied gas storage device. For ease of description, the length direction of the metal sheet is defined as the first direction, the width direction of the metal sheet is defined as the second direction, and the thickness direction of the metal sheet is defined as the third direction.
[0045] like Figures 1 to 8 As shown, the metal sheet for the cryogenic liquefied gas storage device includes a metal substrate 1, a first corrugated section 2, and a second corrugated section 3. The metal substrate 1 has two first corrugated sections 2 spaced apart along a first direction. On the side of the two first corrugated sections 2 that are away from each other, there are two second corrugated sections 3 spaced apart along a second direction. The second corrugated section 3 includes a connecting section 31 and a flared section 32. The connecting section 31 intersects with the first corrugated section 2. The height of the connecting section 31 along a third direction is lower than that of the first corrugated section 2. The flared section 32 is located on the side of the connecting section 31 that is away from the first corrugated section 2. The cross-sectional area of the flared section 32 gradually increases along the direction away from the connecting section 31. The port of the flared section 32 that is away from the connecting section 31 has the same size as the port of the first corrugated section 2. The flared section 32 is used to dock with the first corrugated section 2 of another metal sheet.
[0046] By setting two first corrugated folds 2 spaced apart along a first direction on the metal substrate 1, and setting two second corrugated folds 3 spaced apart along a second direction on the side of the first corrugated folds 2 that are opposite to each other, and making the height of the first corrugated folds 2 greater than the connecting section 31 of the second corrugated folds 3, the structural features for alleviating thermal stress caused by low temperature are enriched, and the effect of alleviating thermal stress is improved. Furthermore, by setting a flared section 32 on the second corrugated folds 3 and making the flared section 32 the same size as the port of the first corrugated folds 2, it is not only convenient to splice different metal sheets, ensuring good sealing inside the tank after splicing, but also to ensure the symmetry of thermal stress in a large area by arranging the spliced metal sheets at 90°, thus ensuring that the overall structure does not warp or deform, thereby further improving the sealing inside the tank after splicing.
[0047] In this embodiment, the first pleated corrugation 2 extends along the width direction of the metal sheet, and the second pleated corrugation 3 extends along the length direction of the metal sheet. The first pleated corrugations 2 are parallel to each other, the second pleated corrugations 3 are parallel to each other, and the first pleated corrugations 2 and the second pleated corrugations 3 intersect perpendicularly. The metal substrate 1 on which the first pleated corrugations 2 and the second pleated corrugations 3 are provided is made of a low-temperature resistant metal material such as S30408 or 06Ni9DR.
[0048] Optionally, such as Figure 2 , Figure 6 As shown, the width dimension of the first pleated ripple 2 along the first direction is W1, and the height dimension of the first pleated ripple 2 along the third direction is H1, and satisfies 1.2≤H1 / W1≤1.6.
[0049] By limiting the ratio between the width W1 of the first pleated corrugation 2 along the first direction and the height H1 of the first pleated corrugation 2 along the third direction, such that 1.2≤H1 / W1≤1.6, the following measures are taken: Firstly, the height H1 is not too small relative to the width W1, which would result in insufficient height of the first pleated corrugation 2. This would limit the space for absorbing low-temperature stress through shape deformation, preventing the effective offsetting of stress generated by thermal expansion and contraction of the metal sheet in low-temperature environments. Consequently, local stress concentration in the metal substrate 1 would occur, leading to cracks or plastic deformation and reducing the structural stability of the storage device. Secondly, the height H1 is not too large relative to the width W1, which would make the forming process more difficult and result in problems such as cracks and uneven pleats in the metal sheet during processing.
[0050] Optionally, such as Figures 1 to 4As shown, the metal substrate 1 has a flat posture and a curved posture. When the metal substrate 1 is in a curved posture, a blank area 100 for bending is provided between the two first folds 2. The length dimension of the blank area 100 along the first direction is L, and L > 2H1.
[0051] By setting a blank area 100 between the first corrugations 2, it is convenient to bend the metal substrate 1, so that the metal substrate 1 is in a curved posture. The metal sheet in the curved posture can serve as the corner structure connecting the side wall and bottom wall of the entire tank, ensuring that the corner of the tank is a complete structure, and making the metal sheet of the side wall and bottom wall of the tank more smoothly connected. This avoids the problem of poor sealing caused by directly welding the two types of metal sheets at the corner. The length L of the blank area 100 along the first direction satisfies L>2H1, thereby avoiding interference between two adjacent first corrugations 2 when bending the metal substrate 1.
[0052] Optionally, such as Figure 6 , Figure 7 As shown, the height dimension of the connecting segment 31 along the third direction is H2, and the ratio between the height dimension H2 of the connecting segment 31 along the third direction and the height dimension H1 of the first pleated corrugation 2 along the third direction satisfies 0.65≤H2 / H1≤0.75.
[0053] By limiting the ratio between the height dimension H2 of the connecting segment 31 along the third direction and the height dimension H1 of the first corrugated 2 along the third direction, such that 0.65≤H2 / H1≤0.75, the following measures are taken: Firstly, the height dimension H2 is not too small relative to the height dimension H1, resulting in insufficient height of the connecting segment 31 of the second corrugated 3. This limits the space for the second corrugated 3 to absorb low-temperature stress through shape deformation, causing the stress generated by thermal expansion and contraction of the metal sheet in low-temperature environments to be unable to be effectively offset. This leads to local stress concentration in the metal substrate 1, which in turn causes cracks or plastic deformation, reducing the structural stability of the storage device. Secondly, the height dimension H2 is not too large relative to the height dimension H1, causing the height of the connecting segment 31 of the second corrugated 3 to be close to that of the first corrugated 2. This prevents the stress generated by temperature difference in the metal substrate 1 in low-temperature environments from being effectively dispersed through the staggered structure, thereby reducing the effect of mitigating temperature stress.
[0054] Optionally, such as Figure 4 , Figure 7 As shown, the width dimension of the connecting segment 31 along the second direction is W2, and the ratio between the height dimension H2 of the connecting segment 31 along the third direction and the width dimension W2 of the connecting segment 31 along the second direction satisfies 1.5≤H2 / W2≤1.9.
[0055] By limiting the ratio between the width W2 of the second corrugated 3 along the second direction and the height H2 of the second corrugated 3 along the third direction, such that 1.5 ≤ H2 / W2 ≤ 1.9, the following measures are taken: First, the height H2 is not too small relative to the width W2, which would result in insufficient height of the second corrugated 3. This would limit the space for absorbing low-temperature stress through shape deformation, preventing the effective offsetting of stress generated by thermal expansion and contraction of the metal sheet in low-temperature environments. This would lead to localized stress concentration in the metal substrate 1, causing cracks or plastic deformation and reducing the structural stability of the storage device. Second, the height H2 is not too large relative to the width W2, which would make the forming process more difficult and lead to problems such as cracks and uneven corrugations in the metal sheet during processing.
[0056] Optionally, such as Figure 3 , Figure 4 As shown, the metal sheet for the cryogenic liquefied gas storage device also includes a third corrugated 4. The blank area 100 is provided with two third corrugated 4 that correspond one-to-one with the second corrugated 3 and intersect with the first corrugated 2.
[0057] Since the blank area 100 is used for bending the metal sheet, the ability of the corner area to withstand stress in the circumferential direction is enhanced by setting the third pleated corrugation 4 in the blank area 100.
[0058] Optionally, such as Figure 1 , Figure 3 As shown, the first pleated corrugation 2 is provided with a first recessed structure 5, which is located at the connection between the first pleated corrugation 2 and the third pleated corrugation 4.
[0059] Since the connection between the first folded corrugation 2 and the third folded corrugation 4 is the stress convergence point of the cross structure, the temperature difference stress caused by thermal expansion and contraction in low-temperature environments is prone to concentrate here, leading to material deformation or even cracking. Therefore, by setting the first recessed structure 5 at the connection point to actively absorb and disperse the tensile or compressive stress caused by the temperature difference, the stress is prevented from being excessively concentrated at the node, and the stress originally concentrated at the intersection point is diffused to the periphery of the recessed area, reducing the local stress peak and thus improving the overall deformation resistance of the metal sheet.
[0060] Optionally, such as Figure 1 , Figure 3 As shown, the first pleated corrugation 2 is provided with a second recessed structure 6, which is located at the connection between the first pleated corrugation 2 and the second pleated corrugation 3.
[0061] Since the connection between the first folded corrugation 2 and the second folded corrugation 3 is the stress convergence point of the cross structure, the temperature difference stress caused by thermal expansion and contraction in low-temperature environments is prone to concentrate here, leading to material deformation or even cracking. Therefore, by setting the second recessed structure 6 at the connection, the tensile or compressive stress caused by the temperature difference is actively absorbed and dispersed, avoiding excessive stress accumulation at the node, and causing the stress originally concentrated at the intersection to diffuse to the periphery of the recessed area, reducing the local stress peak, thereby improving the overall deformation resistance of the metal sheet.
[0062] Optionally, such as Figure 1 , Figure 3 As shown, the first pleated corrugation 2 is provided with a third recessed structure 7, which is disposed on the surface of the first pleated corrugation 2 away from the metal substrate 1 in a third direction.
[0063] By setting a third recessed structure 7 on the surface of the first folded corrugation 2 away from the metal substrate 1 in a third direction, the deformation energy generated by thermal expansion and contraction can be actively absorbed in a low-temperature environment by changing the surface geometry, and the temperature difference stress originally concentrated at the top of the fold can be dispersed to the recessed area, reducing the stress peak and preventing the material from cracking due to stress concentration.
[0064] Optionally, such as Figure 1 , Figure 3 As shown, the first fold 2 is provided with a third recessed structure 7 in the area between the two second fold 3.
[0065] By setting a third recessed structure 7 in the area between the two second folded corrugations 3 of the first folded corrugation 2, the stress concentration problem caused by the intersection of corrugations in this area can be accurately alleviated. In low-temperature environments, the elastic deformation of the recessed structure actively absorbs the temperature difference stress, effectively reducing the local stress peak and avoiding material fatigue cracking.
[0066] Optionally, such as Figure 1 , Figure 3 As shown, the first fold 2 is provided with a third recessed structure 7 in two regions where the two second fold 3 are opposite to each other.
[0067] By setting a third recessed structure 7 in both regions of the first folded corrugation 2 that are opposite to each other in the two regions of the two second folded corrugations 3, the stress at the ends of the first folded corrugation 2 can be further dispersed, and the overall stress distribution can be optimized.
[0068] In this embodiment, the position of the third recessed structure 7 can be freely set according to the requirements. It can be set alone in the area between the two second folded ripples 3, or it can be set alone in the two areas where the first folded ripple 2 is located away from each other, or it can be set both in the area between the two second folded ripples 3 and in the two areas where the first folded ripple 2 is located away from each other.
[0069] In the fabrication of the metal sheet, the orientation of the sheet is first determined. If it is flat, a pressing process is used on the metal substrate 1, employing a pressing mold to press the substrate 1, forming a first folded corrugation 2. Then, the substrate 1 is pressed a second time using the pressing mold to form a second folded corrugation 3 that intersects with the first folded corrugation 2, creating a second recessed structure 6 at the junction of the first and second folded corrugations 2. The pressing process is then repeated using a pressing mold to finally form a third recessed structure 7 on the first folded corrugation 2. If the sheet is curved, then... The size of the blank area 100 between the two first folded corrugations 2 is controlled by a pressing mold. After the pressing operation is completed, the metal sheet is bent to form a curved shape. In order to ensure that the bent metal sheet has a good effect of relieving thermal stress in the blank area 100, a pressing process is added after the pressing operation of the second folded corrugation 3 is completed. That is, the metal substrate 1 is pressed by a pressing mold to form a third folded corrugation 4 that intersects with the first folded corrugation 2 in the blank area 100, and a first recessed structure 5 is formed at the connection between the first folded corrugation 2 and the third folded corrugation 4.
[0070] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A thin metal sheet for a cryogenic liquefied gas storage device, characterized in that, The metal sheet for the cryogenic liquefied gas storage device includes: metal substrate(1); The first pleated corrugation (2) is provided on the metal substrate (1) with two first pleated corrugations (2) spaced apart along a first direction; The second pleated corrugation (3) is provided on each side of the two first pleated corrugations (2) that are away from each other, and is spaced apart along the second direction. The second pleated corrugation (3) includes a connecting section (31) and a flared section (32). The connecting section (31) intersects with the first pleated corrugation (2). The height of the connecting section (31) along the third direction is lower than that of the first pleated corrugation (2). The flared section (32) is located on the side of the connecting section (31) that is away from the first pleated corrugation (2). The cross-sectional area of the flared section (32) gradually increases in the direction away from the connecting section (31). The port of the flared section (32) that is away from the connecting section (31) has the same size as the port of the first pleated corrugation (2). The flared section (32) is used to dock with the first pleated corrugation (2) of another metal sheet.
2. The metal sheet for a cryogenic liquefied gas storage device according to claim 1, characterized in that, The width dimension of the first pleated ripple (2) along the first direction is W1, and the height dimension of the first pleated ripple (2) along the third direction is H1, and satisfies 1.2≤H1 / W1≤1.
6.
3. The metal sheet for a cryogenic liquefied gas storage device according to claim 2, characterized in that, The metal substrate (1) has a flat posture and a curved posture. When the metal substrate (1) is in the curved posture, a blank area (100) for bending is provided between the two first folds (2). The length dimension of the blank area (100) along the first direction is L, and L > 2H1.
4. The metal sheet for a cryogenic liquefied gas storage device according to claim 2, characterized in that, The height dimension of the connecting segment (31) along the third direction is H2, and the ratio between the height dimension H2 of the connecting segment (31) along the third direction and the height dimension H1 of the first pleated ripple (2) along the third direction satisfies 0.65≤H2 / H1≤0.
75.
5. The metal sheet for a cryogenic liquefied gas storage device according to claim 4, characterized in that, The width dimension of the connecting segment (31) along the second direction is W2, and the ratio between the height dimension H2 of the connecting segment (31) along the third direction and the width dimension W2 of the connecting segment (31) along the second direction satisfies 1.5≤H2 / W2≤1.
9.
6. The metal sheet for a cryogenic liquefied gas storage device according to claim 3, characterized in that, The metal sheet for the cryogenic liquefied gas storage device also includes a third pleated corrugation (4). The blank area (100) is provided with two third pleated corrugations (4) that correspond one-to-one with the second pleated corrugation (3) and intersect with the first pleated corrugation (2).
7. The metal sheet for a cryogenic liquefied gas storage device according to claim 6, characterized in that, The first pleated corrugation (2) is provided with a first recessed structure (5), which is located at the connection between the first pleated corrugation (2) and the third pleated corrugation (4).
8. The metal sheet for a cryogenic liquefied gas storage device according to claim 1, characterized in that, The first pleated corrugation (2) is provided with a second recessed structure (6), which is located at the connection between the first pleated corrugation (2) and the second pleated corrugation (3).
9. The metal sheet for a cryogenic liquefied gas storage device according to claim 1, characterized in that, The first pleated corrugation (2) is provided with a third recessed structure (7), which is provided on the surface of the first pleated corrugation (2) away from the metal substrate (1) in the third direction.
10. The metal sheet for a cryogenic liquefied gas storage device according to claim 9, characterized in that, The first pleated ripple (2) is provided with the third recessed structure (7) in the region between the two second pleated ripples (3); And / or, the first pleated ripple (2) is provided with the third recessed structure (7) in two regions where the two second pleated ripples (3) are opposite to each other.