A tower structure for gravitational energy storage

Abstract

This invention discloses a tower structure for gravity energy storage, belonging to the field of gravity energy storage technology. It includes: a raft foundation, an outer cylinder, an inner cylinder, a first rib, and a second rib. The raft foundation is embedded in the soil. The bottoms of the outer cylinder, inner cylinder, first rib, and second rib are all anchored to the top of the raft foundation. Multiple first ribs are evenly distributed throughout the tower structure, with one end of each rib anchored to the inner wall of the outer cylinder and the other end anchored to the outer wall of the inner cylinder, connecting the outer and inner cylinder walls. Multiple second ribs are evenly distributed among the first ribs, with one end of each second rib anchored to the inner wall of the outer cylinder. By incorporating first and second ribs, this invention allows for an increase in the number of energy storage blocks that can be mounted within the same reinforced concrete outer cylinder dimensions, thereby improving energy storage efficiency. This invention features clear functional zoning, a rational structural layout, and excellent mechanical properties, meeting the requirements of various energy storage scales.

Description

Technical Field

[0001] This invention belongs to the field of gravity energy storage technology, specifically relating to a tower structure for gravity energy storage. Background Technology

[0002] Among existing energy storage technologies, pumped-storage hydroelectric power stations offer large-capacity energy storage with an energy cycle efficiency of up to 75%. However, constructing pumped-storage power stations requires stringent geographical conditions, large quantities of water, and favorable dam and reservoir construction conditions. They are heavily constrained by natural conditions, involve huge initial investments, and have a wide-ranging impact. Chemical batteries have low energy density, high cost, demanding technology, limited lifespan, and require large quantities of raw materials. While widely used in portable electronic devices and showing promising prospects in electric vehicles and other transportation, they struggle to meet the ultra-large-capacity energy storage needs of national backbone power grids. Ultra-large-scale capacitors offer advantages such as ultra-high power discharge and high cycle efficiency, but their low energy density and requirement for AC / DC conversion make them suitable for use in automobiles, but they are insufficient for industrial and civilian energy storage needs.

[0003] Among existing large-scale physical energy storage systems, gravity energy storage systems have significant advantages in terms of ease of use and cost-effectiveness. Gravity energy storage systems store energy by increasing the potential energy of the storage medium. Solid-load gravity energy storage systems mainly utilize mountain slopes, underground shafts, artificial structures, etc., to lift or pull heavy objects to store energy.

[0004] Among existing gravity energy storage technologies, Chinese patents CN113653612A and CN214674543U both describe inclined gravity energy storage systems, whose efficiency is closely related to the slope of the track and the external environment. Because the construction costs of steep slopes and tracks are generally high, and because such energy storage systems without enclosure structures need to consider environmental factors such as extreme weather and geological disasters, they are not suitable for commercial applications.

[0005] Chinese patent CN111287918A provides a more economical and environmentally friendly suspended gravity energy storage system that uses abandoned mine shafts and gangue as energy storage channels and mass blocks, respectively, which can significantly reduce initial costs. However, the inconsistency in gangue quality greatly affects the stability of power output, and the number and scale of abandoned mine shafts further limit its nationwide promotion and application.

[0006] Chinese patent CN111692055A provides a suspended gravity energy storage system that utilizes a beam frame structure to create conditions for the vertical lifting of heavy objects. This system has low requirements for geographical conditions but occupies a relatively large area and requires a high initial investment, so there is still considerable room for improvement.

[0007] The Swiss company Energy Vault proposed a structure that uses cranes to stack concrete blocks into a tower, storing and releasing energy by lifting and lowering the blocks. However, this design presents structural risks, requires overcoming external environmental influences during operation, and suffers from an unreasonable structural design with poor wind and earthquake resistance, necessitating additional anti-tipping measures. Furthermore, the overall system exhibits poor economic efficiency and operational stability.

[0008] It is evident that existing gravity energy storage systems are either limited by terrain and prior conditions, significantly affected by the environment, or pose structural risks; furthermore, their operation is complex and their control is unstable. For these reasons, existing gravity energy storage systems have poor scalability. Summary of the Invention

[0009] The purpose of this invention is to provide a tower structure for gravity energy storage, so as to solve the defects of existing gravity energy storage systems, such as complex operation and unstable control.

[0010] To solve the above-mentioned technical problems, the present invention is implemented using the following solution:

[0011] A tower structure for gravity energy storage includes: a raft foundation, an outer cylinder, an inner cylinder, a first rib, and a second rib. The raft foundation is embedded in the soil. The bottoms of the outer cylinder, inner cylinder, first rib, and second rib are all anchored to the top of the raft foundation. Multiple first ribs are provided and evenly distributed in the tower structure. One end of the side of the first rib is anchored to the inner wall of the outer cylinder, and the other end is anchored to the outer wall of the inner cylinder, connecting the outer cylinder wall and the inner cylinder wall together. This improves the overall mechanical performance of the tower structure and increases the out-of-plane bending stiffness of the outer cylinder wall. Multiple second ribs are provided and evenly distributed among the first ribs. One end of the side of the second rib is anchored to the inner wall of the outer cylinder, providing out-of-plane support for the outer cylinder wall.

[0012] Furthermore, hanging plates are provided on the inner wall of the outer cylinder, the side of the first rib wall, and the side of the second rib wall for mounting energy storage blocks; there are gaps between the hanging plates for the slings of the crane lifting device to pass through.

[0013] Furthermore, the hanging plate is connected to an anchor plate, which is connected to the outer cylinder, the first rib wall, or the second rib wall via anchor bars.

[0014] Furthermore, the raft foundation, outer cylinder, inner cylinder, first rib wall, and second rib wall are all reinforced concrete structures.

[0015] Furthermore, the inner cylinder has a bracket along its circumference at the top of its outer exterior, and a bracket is also provided at the corresponding height on the inner wall of the outer cylinder. The bracket has a track at the top, a trolley at the top of the track, and a lifting device at the top of the trolley. The trolley rotates in a ring between the inner and outer cylinder walls, thereby completing the lifting, mounting, and moving of the energy storage blocks within the coverage area.

[0016] Furthermore, the inner cylinder forms a cavity for arranging the power generation device and providing lateral support for the support of the power generation device; at the same time, it is also separated from the energy storage block storage space, which can effectively prevent the energy storage block from slipping and damaging the power generation device under abnormal operating conditions.

[0017] Furthermore, the inner cylinder sidewall is provided with connecting holes at intervals, and sliding plates are provided on the inner and outer sides of the connecting holes. The energy storage block is slid from the outer side of the inner cylinder into the inner side of the inner cylinder with the help of the crane's lifting device and the sliding plates, and then used by the power generation device to generate electricity.

[0018] Furthermore, a gap is provided between the sliding plates for the passage of the slings of the crane lifting device.

[0019] Furthermore, the top of the inner cylinder is provided with a sealing cover to support the maintenance of the power generation unit.

[0020] Furthermore, when the inner diameter of the outer cylinder increases, the included angle between the first ribs is reduced, and the number of first ribs is increased, thereby increasing the size of the energy storage block; or the included angle between the second ribs is reduced, and the number of second ribs is increased, thereby increasing the size of the energy storage block. Conversely, when the inner diameter of the outer cylinder decreases, the included angle between the first ribs is increased, and the number of first ribs is decreased, thereby decreasing the size of the energy storage block; or the included angle between the second ribs is increased, and the number of second ribs is decreased, thereby decreasing the size of the energy storage block. In this way, energy storage blocks of different sizes can be arranged to meet different energy storage needs.

[0021] Beneficial effects

[0022] This invention, by incorporating a first rib and a second rib, allows for an increase in the number of energy storage blocks that can be mounted within the same outer cylinder dimensions, thereby improving energy storage efficiency. Furthermore, the first rib increases the out-of-plane bending stiffness of the outer cylinder wall, thus improving its mechanical properties. The second rib connects the outer and inner cylinder walls, enabling them to share the load and further enhancing the overall mechanical performance of the tower structure. The power generation device is located inside the inner cylinder, separated from the energy storage space, effectively preventing damage to the power generation device from energy storage blocks slipping under abnormal operating conditions. The tower structure for gravity energy storage proposed in this invention features clear functional zoning, a rational structural layout, and excellent mechanical properties, meeting the requirements of various energy storage scales. Attached Figure Description

[0023] Figure 1 This is the main view of the present invention;

[0024] Figure 2 yes Figure 1 The AA cross-sectional view is also the bottom plan view of the present invention;

[0025] Figure 3 yes Figure 1 The BB cross-sectional view is also a plan view of the height range of the energy storage block mounted in this invention;

[0026] Figure 4 yes Figure 1 CC cross-sectional view, plan view of the overhead crane layout of the present invention;

[0027] Figure 5 This is a side view of the mounting plate of the present invention;

[0028] Figure 6 This is a top view of the mounting plate of the present invention;

[0029] In the diagram: 1. Raft foundation; 2. Outer cylinder; 3. Inner cylinder; 4. First rib; 5. Second rib; 6. Corbel; 7. Track; 8. Crane; 81. Lifting device; 82. Sling; 9. Roof; 10. Support column; 11. Cover plate; 12. Energy storage block; 13. Hanging plate; 131. Hanging plate gap; 132. Anchor bar; 133. Anchor plate; 14. Connecting hole; 15. Slide plate; 151. Slide plate gap; 16. Power generation device; 17. Support frame. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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 invention.

[0033] Example 1

[0034] like Figure 1As shown, the present invention discloses a tower structure for gravity energy storage, which mainly includes a raft foundation 1, an outer cylinder 2, an inner cylinder 3, a first rib wall 4, a second rib wall 5, a corbel 6, a support column 10, and a roof 9. The raft foundation 1 is buried at a certain depth in the soil; the bottoms of the outer cylinder 2, inner cylinder 3, first rib wall 4, and second rib wall 5 are all anchored to the top of the raft foundation 1; one end of the side of the first rib wall 4 is anchored to the inner wall of the outer cylinder 2; one end of the side of the second rib wall 5 is anchored to the inner wall of the outer cylinder 2, and the other end is anchored to the outer wall of the inner cylinder 3; hanging plates 13 are provided on the inner wall of the outer cylinder 2, the side of the first rib wall 4, and the side of the second rib wall 5 within a certain height range, which can be used to hang energy storage blocks 12; a certain space is enclosed inside the inner cylinder 3, which can be used to arrange power generation devices 16; connecting holes 14 are provided at intervals within a certain height range on the side wall of the inner cylinder 3, and sliding plates 15 are provided on the inner and outer sides of the connecting holes 14, so that the energy storage blocks 12 can slide from the outside of the inner cylinder 3 into the inside of the inner cylinder 3 with the help of the sliding plates 15, and then be used by the power generation devices 16 to generate electricity.

[0035] This invention, by setting a first rib 4 and a second rib 5, can increase the number of energy storage blocks 12 that can be mounted under the same outer cylinder 2 dimensions, thereby improving energy storage efficiency. Furthermore, the second rib 5 increases the out-of-plane bending stiffness of the outer cylinder wall, thus improving its mechanical properties. The first rib 4 connects the outer cylinder 2 wall and the inner cylinder 3 wall together, allowing them to share the load and further improving the overall mechanical properties of the tower structure. The power generation device 16 is located inside the inner cylinder 3, separated from the storage space of the energy storage blocks 12, effectively preventing damage to the power generation device 16 caused by the energy storage blocks 12 slipping under abnormal operating conditions. The tower structure for gravity energy storage proposed in this invention has clear functional zoning, a reasonable structural layout, and excellent mechanical properties, meeting the requirements of various energy storage scales.

[0036] Specifically, a tower structure for gravity energy storage includes: a raft foundation 1, an outer cylinder 2, an inner cylinder 3, a first rib wall 4, a second rib wall 5, a support column 10, and a roof 9.

[0037] Specifically, the raft foundation 1 is buried at a certain depth in the soil; the bottoms of the outer cylinder 2, inner cylinder 3, first rib wall 4, and second rib wall 5 are all anchored to the top of the raft foundation 1.

[0038] Specifically, the first ribs 4 are evenly arranged in the tower structure, and one end of each side of the first ribs 4 is anchored to the inner wall of the outer cylinder 2, and the other end is anchored to the outer wall of the inner cylinder 3. Connecting the outer cylinder 2 wall and the inner cylinder 3 wall together can improve the mechanical performance of the overall tower structure.

[0039] Specifically, the second ribs 5 are evenly arranged between the first ribs 4, and one side of each of the second ribs 5 is anchored to the inner wall of the outer cylinder 2, which can provide out-of-plane support for the outer cylinder 2.

[0040] Specifically, hanging plates 13 are provided on the inner wall of the outer cylinder 2, the side of the first rib wall 4, and the side of the second rib wall 5 within a certain height range, and the hanging plates 13 can hang the energy storage blocks 12.

[0041] Specifically, a bracket 6 is provided on the top of the outer side of the inner cylinder 3 along the circumference, and a bracket 6 is also provided on the inner wall of the outer cylinder 2 at the corresponding height. A track 7 is provided on the top of the bracket 6, a trolley 8 is provided on the top of the track 7, and a lifting device 81 is provided on the top of the trolley 8. The trolley 8 can rotate in a ring between the inner cylinder 3 wall and the outer cylinder 4 wall, thereby completing the lifting, mounting, and moving operations of the energy storage block 12 within the coverage area.

[0042] Specifically, the inner cylinder 3 forms a certain space where the power generation device 16 can be arranged, and it can provide lateral support for the support 17 of the power generation device 16.

[0043] Specifically, the inner cylinder 3 has connecting holes 14 spaced at intervals within a certain height range on its side wall. Slide plates 15 are provided on both the inner and outer sides of the connecting holes 14. The energy storage block 12 can slide from the outside of the inner cylinder 3 into the inside of the inner cylinder 3 using the lifting device 81 of the crane 8 and the slide plates 15, and then be used by the power generation device 16 to generate electricity. A slide plate gap 151 is provided between the slide plates 15. Figure 3 The sling 82 can pass through the lifting device 81 of the crane 8.

[0044] Specifically, the hanging plate 13 is connected to the anchor plate 133, and the anchor plate 133 is connected to the outer cylinder 2, the first rib wall 4 or the second rib wall 5 through the anchor bar 132; there is a hanging plate gap 134 between the hanging plates 13, through which the sling 82 of the lifting device 81 of the crane 8 can pass.

[0045] Specifically, the raft foundation 1, outer cylinder 2, inner cylinder 3, first rib wall 4, and second rib wall 5 are all reinforced concrete structures.

[0046] Specifically, a sealing cover plate 11 is installed at the top of the inner cylinder 3 to provide support for the maintenance of the power generation unit.

[0047] Example 2

[0048] When the inner diameter of the outer cylinder 2 increases, the included angle between the first ribs 4 is reduced, and the number of the first ribs 4 is increased, thereby increasing the size of the energy storage block 12; or the included angle between the second ribs 5 is reduced, and the number of the second ribs 5 is increased, thereby increasing the size of the energy storage block 12. When the inner diameter of the outer cylinder 2 decreases, the included angle between the first ribs 4 is increased, and the number of the first ribs 4 is decreased, thereby decreasing the size of the energy storage block 12; or the included angle between the second ribs 5 is increased, and the number of the second ribs 5 is decreased, thereby decreasing the size of the energy storage block 12. In this way, different energy storage needs can be adapted.

[0049] Other components are the same as in Example 1.

[0050] This invention discloses a tower structure for gravity energy storage, which mainly includes a raft foundation 1, an outer cylinder 2, an inner cylinder 3, a first rib wall 4, a second rib wall 5, a corbel 6, a support column 10, and a roof 9. The raft foundation 1 is buried at a certain depth in the soil; the bottoms of the outer cylinder 2, inner cylinder 3, first rib wall 4, and second rib wall 5 are all anchored to the top of the raft foundation 1; one end of the side of the first rib wall 4 is anchored to the inner wall of the outer cylinder 2; one end of the side of the second rib wall 5 is anchored to the inner wall of the outer cylinder 2, and the other end is anchored to the outer wall of the inner cylinder 3; hanging plates 13 are provided on the inner wall of the outer cylinder 2, the side of the first rib wall 4, and the side of the second rib wall 5 within a certain height range, which can be used to hang energy storage blocks 12; a certain space is enclosed inside the inner cylinder 3, which can be used to arrange power generation devices 16; connecting holes 14 are provided at intervals within a certain height range on the side wall of the inner cylinder 3, and sliding plates 15 are provided on the inner and outer sides of the connecting holes 14, so that the energy storage blocks 12 can slide from the outside of the inner cylinder 3 into the inside of the inner cylinder 3 with the help of the sliding plates 15, and then be used by the power generation devices 16 to generate electricity.

[0051] This invention, by setting a first rib 4 and a second rib 5, can increase the number of energy storage blocks 12 that can be mounted under the same outer cylinder 2 dimensions, thereby improving energy storage efficiency. Furthermore, the second rib 5 increases the out-of-plane bending stiffness of the outer cylinder wall, thus improving its mechanical properties. The first rib 4 connects the outer cylinder 2 wall and the inner cylinder 3 wall together, allowing them to share the load and further improving the overall mechanical properties of the tower structure. The power generation device 16 is located inside the inner cylinder 3, separated from the storage space of the energy storage blocks 12, effectively preventing damage to the power generation device 16 caused by the energy storage blocks 12 slipping under abnormal operating conditions. The tower structure for gravity energy storage proposed in this invention has clear functional zoning, a reasonable structural layout, and excellent mechanical properties, meeting the requirements of various energy storage scales.

[0052] Specifically, a tower structure for gravity energy storage includes: a raft foundation 1, an outer cylinder 2, an inner cylinder 3, a first rib wall 4, a second rib wall 5, a support column 10, and a roof 9.

[0053] Specifically, the raft foundation 1 is buried at a certain depth in the soil; the bottoms of the outer cylinder 2, inner cylinder 3, first rib wall 4, and second rib wall 5 are all anchored to the top of the raft foundation 1.

[0054] Specifically, the first ribs 4 are evenly arranged in the tower structure, and one end of each side of the first ribs 4 is anchored to the inner wall of the outer cylinder 2, and the other end is anchored to the outer wall of the inner cylinder 3. Connecting the outer cylinder 2 wall and the inner cylinder 3 wall together can improve the mechanical performance of the overall tower structure.

[0055] Specifically, the second ribs 5 are evenly arranged between the first ribs 4, and one side of each of the second ribs 5 is anchored to the inner wall of the outer cylinder 2, which can provide out-of-plane support for the outer cylinder 2.

[0056] Specifically, hanging plates 13 are provided on the inner wall of the outer cylinder 2, the side of the first rib wall 4, and the side of the second rib wall 5 within a certain height range, and the hanging plates 13 can hang the energy storage blocks 12.

[0057] Specifically, a bracket 6 is provided on the top of the outer side of the inner cylinder 3 along the circumference, and a bracket 6 is also provided on the inner wall of the outer cylinder 2 at the corresponding height. A track 7 is provided on the top of the bracket 6, a trolley 8 is provided on the top of the track 7, and a lifting device 81 is provided on the top of the trolley 8. The trolley 8 can rotate in a ring between the inner cylinder 3 wall and the outer cylinder 4 wall, thereby completing the lifting, mounting, and moving operations of the energy storage block 12 within the coverage area.

[0058] Specifically, the inner cylinder 3 forms a certain space where the power generation device 16 can be arranged, and it can provide lateral support for the support 17 of the power generation device 16.

[0059] Specifically, a sealing cover plate 11 is provided at the top of the inner cylinder 3, which can provide support for the operation and maintenance of the power generation device 16.

[0060] Specifically, the inner cylinder 3 has connecting holes 14 spaced at intervals within a certain height range on its side wall. Slide plates 15 are provided on both the inner and outer sides of the connecting holes 14. The energy storage block 12 can slide from the outside of the inner cylinder 3 into the inside of the inner cylinder 3 using the lifting device 81 of the crane 8 and the slide plates 15, and then be used by the power generation device 16 to generate electricity. A slide plate gap 151 is provided between the slide plates 15. Figure 3 The sling 82 can pass through the lifting device 81 of the crane 8.

[0061] Specifically, the hanging plate 13 is connected to the anchor plate 133, and the anchor plate 133 is connected to the outer cylinder 2, the first rib wall 4 or the second rib wall 5 through the anchor bar 132; there is a hanging plate gap 134 between the hanging plates 13, through which the sling 82 of the lifting device 81 of the crane 8 can pass.

[0062] Specifically, the raft foundation 1, outer cylinder 2, inner cylinder 3, first rib wall 4, and second rib wall 5 are all reinforced concrete structures.

[0063] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A tower structure for gravity energy storage, characterized in that, include: Raft foundation, outer cylinder, inner cylinder, first rib wall, second rib wall; The raft foundation is embedded in the soil. The bottoms of the outer cylinder, inner cylinder, first rib, and second rib are all anchored to the top of the raft foundation. Multiple first ribs are provided and evenly distributed in the tower structure. One end of the side of the first rib is anchored to the inner wall of the outer cylinder, and the other end is anchored to the outer wall of the inner cylinder, connecting the outer cylinder wall and the inner cylinder wall together. Multiple second ribs are provided and evenly distributed among the first ribs. One end of the side of the second rib is anchored to the inner wall of the outer cylinder.

2. The tower structure for gravity energy storage according to claim 1, characterized in that, Hanging plates are provided on the inner wall of the outer cylinder, the side of the first rib wall, and the side of the second rib wall for mounting energy storage blocks; there are gaps between the hanging plates for the slings of the crane lifting device to pass through.

3. A tower structure for gravity energy storage according to claim 2, characterized in that, The hanging plate is connected to an anchor plate, and the anchor plate is connected to the outer cylinder, the first rib wall, or the second rib wall through anchor bars.

4. A tower structure for gravity energy storage according to claim 1, characterized in that, The raft foundation, outer cylinder, inner cylinder, first rib wall, and second rib wall are all reinforced concrete structures.

5. A tower structure for gravity energy storage according to claim 1, characterized in that, The inner cylinder has a bracket along its circumference at the top of its outer side, and a bracket is also provided at the corresponding height on the inner wall of the outer cylinder. The bracket has a track at the top, a trolley at the top of the track, and a lifting device at the top of the trolley. The trolley rotates in a ring between the inner and outer cylinder walls.

6. A tower structure for gravity energy storage according to claim 1, characterized in that, The inner cylinder forms a cavity for arranging the power generation device and providing lateral support for the support frame of the power generation device.

7. A tower structure for gravity energy storage according to claim 1, characterized in that, The inner cylinder sidewall is provided with connecting holes at intervals, and sliding plates are provided on the inner and outer sides of the connecting holes. The energy storage block is slid from the outer side of the inner cylinder into the inner side of the inner cylinder with the help of the crane's lifting device and the sliding plates, and then used by the power generation device to generate electricity.

8. A tower structure for gravity energy storage according to claim 7, characterized in that, The slide plates are provided with a gap for the slings of the crane lifting device to pass through.

9. A tower structure for gravity energy storage according to claim 1, characterized in that, The inner cylinder is equipped with a sealing cover plate at the top.

10. A tower structure for gravity energy storage according to claim 1, characterized in that, When the inner diameter of the outer cylinder increases, the included angle between the first ribs is reduced, and the number of the first ribs is increased, thereby increasing the size of the energy storage block; or the included angle between the second ribs is reduced, and the number of the second ribs is increased, thereby increasing the size of the energy storage block. When the inner diameter of the outer cylinder decreases, the included angle between the first ribs is increased, and the number of the first ribs is decreased, thereby decreasing the size of the energy storage block; or the included angle between the second ribs is increased, and the number of the second ribs is decreased, thereby decreasing the size of the energy storage block.

Images