Flexible energy storage rib

Abstract

The invention discloses a flexible energy storage rib, and relates to the technical field of multifunctional building materials. Provided is an arc-shaped concrete beam. When the flexible energy storage rib is used, the flexible energy storage rib comprises a flexible battery core which is a modular assembly formed by connecting a single flexible battery cell or a plurality of rigid battery cell units in series through a flexible circuit; the buffer heat-conducting layer wraps the battery core, is made of silicone heat-conducting glue and has the effects of fixing, buffering and heat dissipation; the flexible composite rib body is a hollow rib body formed by dipping a tough resin matrix in a fiber woven sleeve and curing the fiber woven sleeve. Through the collaborative design of the flexible battery core, the buffer layer and the flexible FRP rib, the flexible FRP rib flexible battery can be bent along with the shape and laid in curved surface concrete members such as an arc-shaped beam, a dome and a wave-shaped floor slab, the electric energy is stably stored and released while the load is borne, and the development of a building structure-function integration technology is promoted.

Description

Technical Field

[0001] This invention relates to the field of multifunctional building materials technology, specifically a flexible energy storage rib. Background Technology

[0002] With the rapid development of modern architectural aesthetics and technology, the application of irregularly shaped curved concrete structures is becoming increasingly widespread. These structures not only pursue artistic form but also place higher demands on the sustainability and intelligence of buildings. The integrated "structure-energy storage" technology, which integrates energy storage components into the building's load-bearing structure, is considered an important direction for achieving building energy conservation and energy self-sufficiency.

[0003] In existing technologies, research in this field mainly focuses on encapsulating rigid batteries within straight fiber-reinforced composite material ribs to form straight energy storage ribs. However, such rigid energy storage ribs have a core bottleneck: conventional commercial cylindrical or square battery cells are rigid bodies that can hardly withstand bending deformation. Forced bending can lead to internal structural damage, causing serious safety issues such as leakage, short circuits, and even thermal runaway; traditional fiber-reinforced composite material ribs are mostly formed using pultrusion processes, which, although having high axial tensile strength, have poor transverse shear and bending resistance. When bent, the resin matrix is ​​prone to cracking, and the fibers on the pressure side are prone to micro-buckling and crushing, leading to overall rib failure. In addition, under bending conditions, the electrical connection points inside the rib are subjected to alternating stress, which is highly susceptible to fatigue fracture due to stress concentration, resulting in open circuits and loss of energy storage function.

[0004] Therefore, we propose a flexible energy storage rib to address the problems mentioned in the background section. Summary of the Invention

[0005] The purpose of this invention is to provide a flexible energy storage rib to solve the problems mentioned in the background art, such as the weak bending deformation resistance of existing rigid energy storage ribs, the inability to maintain structural integrity and mechanical transmission capacity when bending, the impact on the stability and safety of electrochemical energy storage function, and the inability to meet the construction and long-term service requirements of irregular curved surface structures.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a flexible energy storage rib, comprising: Flexible energy storage ribs; Curved concrete beam; A flexible battery core; A buffer thermally conductive layer that surrounds the battery core; A flexible composite rib wrapped around the outside of the buffer thermal conductive layer; The flexible energy storage rib can be bent to a curvature not less than a predetermined minimum bending radius, and maintains its structural integrity and energy storage and release functions in the bent state.

[0007] Preferably, the flexible battery core includes a cell sub-unit and a flexible conductive connector. The flexible battery core is a modular assembly formed by connecting multiple independent cell sub-units in series through the flexible conductive connector, and gaps are left between the cell sub-units to allow the whole assembly to bend.

[0008] Preferably, the flexible conductive connector is made of stranded wire that is resistant to bending.

[0009] Preferably, the flexible composite reinforcement includes a fiber braided sleeve and a tough resin matrix. The flexible composite reinforcement is formed by impregnating the fiber braided sleeve with the tough resin matrix and curing it. The flexible composite reinforcement is a flexible hollow fiber reinforced composite material reinforcement.

[0010] Preferably, the fiber braided sleeve uses a mixture of carbon fiber, glass fiber, and aramid fiber, and the tough resin matrix is ​​a flexible epoxy resin with an elongation at break greater than 8%.

[0011] Preferably, the buffer thermal conductive layer is composed of an elastic, insulating and thermally conductive silicone thermally conductive adhesive.

[0012] Preferably, the arc-shaped concrete beam is a type of irregularly shaped concrete building component, and at least one flexible energy storage reinforcement is laid inside the arc-shaped concrete beam.

[0013] Preferably, the bending shape of the flexible energy storage reinforcement is adapted to the curved surface of the arc-shaped concrete beam.

[0014] A method for preparing flexible energy storage ribs includes the following steps: S1 provides a flexible battery core; S2. Place the assembled battery core into the molding die; S3. A fiber-woven sleeve is fitted over the battery core. S4. Inject liquid tough resin matrix and buffer thermal conductive material into the mold to fully impregnate the fiber braided sleeve and fill the gaps around the battery core to form a buffer thermal conductive layer. S5. Curing is carried out by heating, so that the liquid tough resin matrix and the buffer thermal conductive layer are cured simultaneously to form a flexible composite rib that is tightly integrated with the battery core. S6. Demold the product to obtain the finished flexible energy storage rib.

[0015] Preferably, a vacuum-assisted resin transfer molding process is used for resin injection and impregnation.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. When used, this invention achieves a technological breakthrough: for the first time, energy storage bars can be stably and reliably applied to complex concrete structures such as hyperboloids, arches, and waves, fundamentally solving the application limitations of rigid energy storage bars and greatly expanding the application boundaries of the "structure-energy storage" integration.

[0017] 2. When used, this invention achieves an excellent balance between mechanical and electrical properties: through the collaborative design of "flexible battery cell / modular battery cell + elastic buffer layer + flexible FRP reinforcement", while ensuring the good bending performance and axial tensile strength of the reinforcement, it does not sacrifice its energy storage capacity, thus achieving a perfect combination of load-bearing and energy storage.

[0018] 3. When used, this invention achieves high safety and reliability: the modular battery series connection scheme avoids the risk of single-point failure; the tough resin matrix and fiber braided structure prevent brittle fracture during bending; and the buffer thermal conductive layer effectively protects the battery cells and improves thermal management. These designs together ensure the safety and durability of the product under bending conditions and long-term use.

[0019] 4. The invention is easy to use and has good compatibility: This type of flexible energy storage bar can be bent, cut and fixed on the construction site according to the shape of the template, just like traditional steel bars or FRP bars. It can be seamlessly integrated into the existing curved component construction process without the need for special installation equipment or processes. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of the application of a flexible energy storage bar in an arc-shaped concrete beam according to the present invention. Figure 2 This is a schematic diagram of the cross-sectional structure of the flexible energy storage rib in the present invention. Figure 3 This is a schematic diagram of the core battery structure of a flexible energy storage rib using a "modular flexible series connection scheme" according to the present invention. Figure 4 This is a schematic diagram of the core structure of a battery using a "single flexible cell" scheme in a flexible energy storage rib according to the present invention. Figure 5 This is a schematic diagram of the fiber braided sleeve in a flexible energy storage rib according to the present invention.

[0021] In the picture: 100. Flexible energy storage ribs; 10. Battery core; 11. Battery cell sub-unit; 12. Flexible conductive connector; 20. Buffer thermal conductive layer; 30. Flexible composite ribs; 31. Fiber braided sleeve; 32. Tough resin matrix; 200. Curved concrete beam. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1: Please refer to Figures 1-5 As shown, the present invention provides a technical solution: a flexible energy storage rib, comprising: a flexible energy storage rib body 100; an arc-shaped concrete beam 200; a flexible battery core 10; a buffer heat-conducting layer 20 wrapped around the battery core 10; and a flexible composite rib body 30 wrapped around the buffer heat-conducting layer 20. The flexible energy storage rib body 100 can be bent to a curvature not less than a predetermined minimum bending radius, and maintains its structural integrity and energy storage and release functions in the bent state. The flexible battery core 10 includes a cell sub-unit 11 and a flexible conductive connector 12. The flexible battery core 10 is a modular assembly formed by multiple independent cell sub-units 11 connected in series through the flexible conductive connector 12. A gap is left between the cell sub-units 11 to allow overall bending. The flexible conductive connector 12... The flexible composite reinforcement 30 uses a bend-resistant stranded conductor and includes a fiber braided sleeve 31 and a tough resin matrix 32. The flexible composite reinforcement 30 is formed by impregnating the fiber braided sleeve 31 with the tough resin matrix 32 and curing it. The flexible composite reinforcement 30 is a flexible hollow fiber reinforced composite material reinforcement. The fiber braided sleeve 31 uses a mixture of carbon fiber, glass fiber and aramid fiber. The tough resin matrix 32 is a flexible epoxy resin with an elongation at break greater than 8%. The buffer heat-conducting layer 20 is made of elastic, insulating and thermally conductive silicone thermally conductive adhesive. The arc-shaped concrete beam 200 is a type of irregular concrete building component. At least one flexible energy storage reinforcement 100 is laid inside the arc-shaped concrete beam 200. The bending shape of the flexible energy storage reinforcement 100 is adapted to the curved surface of the arc-shaped concrete beam 200.

[0024] When in use, the flexible energy storage rib 100 mainly includes: a flexible battery core 10, a buffer heat-conducting layer 20, and a flexible composite rib 30.

[0025] Flexible Battery Core 10: The battery core 10 can adopt two optional flexibility schemes: First, it uses single flexible cells, such as stacked polymer soft-pack batteries, whose electrodes and separators adopt a flexible stacked structure, and the outer packaging is a flexible aluminum-plastic film, which can withstand a certain degree of bending deformation. Second, it adopts a modular flexible series scheme, that is, multiple short cylindrical or small sheet-shaped rigid cells are used as sub-units, which are electrically connected by flexible circuit boards or stranded wires. Small gaps are left between the sub-units, thus forming a flexible battery string like a "joint".

[0026] Buffer thermal conductive layer 20: A silicone thermally conductive adhesive is filled between the flexible battery core 10 and the outer ribs as a buffer thermal conductive layer 20. This material has excellent elasticity (absorbing and releasing bending stress), electrical insulation and thermal conductivity, which can effectively protect the battery cell from stress concentration damage and can evenly dissipate the heat generated during battery operation.

[0027] Flexible composite reinforcement 30: The hollow fiber reinforced composite reinforcement is manufactured using a special flexible molding process. It is formed by impregnating a fiber braided sleeve 31 with a flexible resin matrix and then curing it. The fiber braided sleeve 31 itself possesses excellent flexibility; its multi-dimensional braided structure can adapt to deformation during bending through relative slippage and angle changes between fibers, unlike unidirectional fibers which tend to fracture brittlely. The resin matrix is ​​made of flexible epoxy resin, a tough resin with high elongation at break, ensuring that the matrix can undergo plastic deformation rather than cracking during bending, working in synergy with the braided fibers.

[0028] The irregularly shaped concrete building components are curved concrete beams 200, domes, arch shells or corrugated floor slabs. The bending shape of the flexible energy storage reinforcement 100 is adapted to the curved surface of the concrete building component. The flexible energy storage reinforcement 100 is suitable for irregularly shaped curved concrete components such as curved structures, domes, and corrugated floor slabs.

[0029] In this embodiment, the flexible energy storage reinforcement 100 is pre-embedded in the arc-shaped concrete beam 200, and its bending shape is completely consistent with the design curvature of the component, so as to jointly bear the load.

[0030] In this embodiment, the flexible energy storage rib 100 comprises a three-layer structure from the inside out, such as... Figure 2 As shown, battery core 10: adopts as follows Figure 3 The modular flexible series connection scheme shown consists of multiple small-capacity cylindrical lithium-ion cells as sub-units, electrically connected in series via flexible FPC cables welded to their positive and negative tabs. These cells are linearly arranged at a certain spacing, with a tiny gap of about 0.5-2mm between them. This gap provides the necessary deformation space when the overall rib is bent, avoiding direct compression between rigid cells.

[0031] Buffer thermal conductive layer 20: Employs injection-filled two-component addition-type silicone thermally conductive adhesive with a thermal conductivity ≥1.0 W / m·K and a volume resistivity ≥1.0×10⁻⁶. 15 Ω·cm, elongation at break ≥150%. This layer of material completely encapsulates the battery core 10, playing a crucial role in fixing the cell position, transmitting bending stress, providing electrical insulation, and conducting the battery's operating heat outward.

[0032] Flexible composite rib 30: such as Figure 2 and Figure 5 As shown, it is made by impregnating a biaxial or triaxially woven carbon fiber braided sleeve with flexible epoxy resin and curing it. The elongation at break of the flexible epoxy resin is greater than 10%. The mesh structure of the braided sleeve itself has inherent flexibility, while the tough resin ensures the deformation coordination between the matrix and the fiber during bending. This solves the problems of existing rigid energy storage ribs having weak bending deformation resistance, failing to maintain structural integrity and mechanical transmission capacity when bending, affecting the stability and safety of electrochemical energy storage function, and failing to meet the construction and long-term service requirements of irregular curved surface structures.

[0033] Preparation method: First, the battery core 10 is assembled according to the design capacity and voltage requirements, and preliminary electrical performance and safety tests are conducted. Then, the qualified battery core 10 is carefully placed into a cylindrical molding mold of a specific size. Next, a pre-woven carbon fiber sleeve 31 is fitted over the battery core 10 inside the mold. After closing the mold, a vacuum-assisted resin transfer molding process is used. First, liquid silicone thermally conductive adhesive is injected to encapsulate the battery core 10 and fill all gaps, forming a buffer thermally conductive layer 20. Subsequently, or after mixing, flexible epoxy resin is injected to fully impregnate the carbon fiber sleeve 31 under vacuum negative pressure. Finally, the mold is placed in an oven at 80°C for 4 hours to cure. After demolding, a flexible energy storage rib 100 with tight internal and external bonding and uniform structure is obtained. Tests show that the finished product can be safely bent to the minimum bending radius without breaking, and the capacity and internal resistance do not change significantly before and after bending.

[0034] Example 2: Figures 1-5 As shown, the flexible energy storage rib 100; the arc-shaped concrete beam 200; a flexible battery core 10; a buffer heat-conducting layer 20 wrapped around the battery core 10; and a flexible composite rib 30 wrapped around the buffer heat-conducting layer 20. The flexible energy storage rib 100 can be bent to a curvature not less than a predetermined minimum bending radius, and maintains its structural integrity and energy storage and release functions in the bent state.

[0035] In this embodiment, when in use, such as Figure 4 As shown, a single, high-capacity, stacked polymer lithium-ion pouch cell is used as the battery core 10. This pouch cell itself has good flexibility. Its manufacturing process is similar to that of Example 1, but since it is a single cell, the internal electrical connections are simpler, but the requirements for its bending cycle life are higher.

[0036] The overall effect and working principle of the mechanism are as follows: the flexible energy storage reinforcement 100 is pre-embedded in the arc-shaped concrete beam 200, and its bending shape is completely consistent with the design curvature of the component, sharing the load. The flexible energy storage reinforcement 100 consists of three layers from the inside out, such as... Figure 2 As shown, battery core 10: adopts as follows Figure 3 The modular flexible series connection scheme shown employs multiple small-capacity cylindrical lithium-ion cells as sub-units, electrically connected in series via flexible FPC cables welded to their positive and negative tabs. These cells are linearly arranged at a certain spacing, with a small gap of approximately 0.5-2 mm between them. This gap provides necessary deformation space when the overall rib structure bends, avoiding direct compression between rigid cells. The battery core 10 can also utilize a single, large-capacity, stacked polymer lithium-ion pouch cell, such as... Figure 4 As shown. The buffer thermal conductive layer 20 uses injection-filled two-component addition-type silicone thermal conductive adhesive. This layer completely encapsulates the battery core 10, playing a crucial role in fixing the cell position, transmitting bending stress, providing electrical insulation, and conducting the battery's operating heat outwards. The flexible composite rib 30 is formed by impregnating a biaxial or triaxial woven carbon fiber braided sleeve with flexible epoxy resin and curing it. The elongation at break of the flexible epoxy resin is greater than 10%. The mesh structure of the braided sleeve itself has inherent flexibility, while the tough resin ensures coordinated deformation between the matrix and the fibers during bending.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flexible energy storage tendon, characterized by, The flexible energy storage rib (100) can be bent to a curvature not less than a predetermined minimum bending radius and maintain its structural integrity and electrical energy storage and release function in the bent state. The flexible battery core (10) includes battery cell subunits (11) and flexible conductive connectors (12). The flexible battery core (10) is a modular combination of a plurality of independent battery cell subunits (11) connected in series by flexible conductive connectors (12). Gaps are left between the battery cell subunits (11) to allow overall bending. The flexible conductive connector (12) uses a bending-resistant twisted wire. The flexible composite rib (30) includes a fiber braided sleeve (31) and a tough resin matrix (32). The flexible composite rib (30) is formed by impregnating the fiber braided sleeve (31) with the tough resin matrix (32) and curing it. The flexible composite rib (30) is a flexible hollow fiber-reinforced composite rib. The fiber material used in the fiber braided sleeve (31) is a mixture of carbon fiber, glass fiber, and aramid fiber. The tough resin matrix (32) is a flexible epoxy resin with an elongation at break greater than 8%. The buffer heat conduction layer (20) is composed of elastic, insulating and heat-conducting silicone heat-conducting glue. The arc-shaped concrete beam (200) is a special-shaped concrete building component. At least one flexible energy storage rib (100) is laid inside the arc-shaped concrete beam (200).

2. The flexible energy storage tendon of claim 1, wherein: The bending shape of the flexible energy storage rib (100) is adapted to the curved surface of the arc-shaped concrete beam (200).

3. The flexible energy storage tendon of claim 2, wherein: The flexible energy storage rib of any one of claims 1-8 is used, including the following steps:

4. The flexible energy storage tendon of claim 3, wherein: S1, providing a flexible battery core (10); 5. The flexible energy storage tendon of claim 4, wherein: S2, placing the assembled battery core (10) into a molding mold; 6. The flexible energy storage tendon of claim 5, wherein: S3, setting a fiber braided sleeve (31) outside the battery core (10); 7. The flexible energy storage tendon of claim 6, wherein: S4, injecting liquid tough resin matrix (32) and buffer heat conduction material into the mold, so that it fully impregnates the fiber braided sleeve (31) and fills the gap around the battery core (10), forming a buffer heat conduction layer (20); 8. The flexible energy storage tendon of claim 7, wherein: S5, curing by heating to synchronize the liquid tough resin matrix (32) and the buffer heat conduction layer (20), forming a flexible composite rib (30) tightly combined with the battery core (10); 9. A method for preparing a flexible energy storage rib, characterized in that, S6, demolding to obtain the finished flexible energy storage rib (100). The resin injection and impregnation are carried out by vacuum-assisted resin transfer molding process. ​ ​ ​ ​ ​ 10. The method of claim 9, wherein: ​

Images