Battery with three-dimensional enhanced structure

Abstract

The utility model relates to the technical field of structural batteries, in particular to a three-dimensional reinforced structural battery which comprises a plurality of first reinforced fiber layers, a plurality of first insulating fiber layers, a battery layer, a plurality of second insulating fiber layers and a plurality of second reinforced fiber layers which are sequentially stacked from bottom to top, and a plurality of reinforcing ribs penetrating through the plurality of first insulating fiber layers, the battery layer and the plurality of second insulating fiber layers. A reinforcing rib penetrating reinforcing mode is utilized, a three-dimensional cross-linking reinforcing network is constructed in the dimension perpendicular to the laminating direction, a multi-scale space anchoring system is formed through high-strength reinforcing ribs, and interlayer shear strength and interface bonding force can be remarkably improved; and moreover, uniform load distribution is realized through mechanical transmission path reconstruction, and the electrochemical function integrity can be kept while crack initiation and expansion are inhibited.

Description

Technical Field

[0001] This utility model relates to the field of structural battery technology, and in particular to a three-dimensional reinforced structural battery. Background Technology

[0002] In the prior art, due to the mutual constraints between the introduction of energy storage functional components (including electrodes and electrolyte materials with poor mechanical strength) and the structural load-bearing requirements in structural batteries, the integration of functional energy storage materials significantly reduces the macroscopic mechanical properties of the substrate.

[0003] Specifically, when the system is subjected to mechanical loads, the bonding strength at the interface between the energy storage layer and the structural layer is insufficient, leading to interlayer shear stress concentration. This causes crack propagation and delamination failure at the interface between the carbon fiber reinforcement and the matrix, ultimately resulting in a rapid decline in the overall stiffness and load-bearing capacity of the structural battery. To address the interfacial delamination failure problem in current carbon fiber reinforced structural batteries, researchers have added binders to the electrode materials to construct biomimetic structures that improve the interfacial strength between the electrode materials and the current collector. However, this approach not only has limited effectiveness but also reduces the battery's electrochemical performance with the addition of binders and structural components.

[0004] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a three-dimensional enhanced structural battery, which aims to solve the problem that the electrochemical performance and load-bearing capacity of existing structural batteries cannot be simultaneously achieved.

[0006] The technical solution of this utility model is as follows:

[0007] A three-dimensional reinforced structural battery includes a plurality of first reinforcing fiber layers, a plurality of first insulating fiber layers, a battery layer, a plurality of second insulating fiber layers, and a plurality of second reinforcing fiber layers stacked sequentially from bottom to top; and a plurality of reinforcing ribs disposed through the plurality of first insulating fiber layers, the battery layer, and the plurality of second insulating fiber layers.

[0008] In the three-dimensional reinforced structured battery, the ratio of the diameter of the reinforcing rib to the diameter of the fiber bundle in the first reinforcing fiber layer is 0.5 to 3.

[0009] The three-dimensional reinforced battery structure, wherein the reinforcing ribs are one or more of columnar insulating fibers, linear insulating fibers, columnar fibers with surface insulation treatment, and linear fibers with surface insulation treatment.

[0010] The three-dimensional reinforced structure battery, wherein a plurality of the reinforcing ribs are distributed in a matrix and penetrate a plurality of first insulating fiber layers, the battery layer and a plurality of second insulating fiber layers.

[0011] The three-dimensional reinforced structural battery, wherein the reinforcing ribs penetrate several first insulating fiber layers, the battery layer and several second insulating fiber layers in one of the following: lock stitch, tufted stitch, blind stitch, and double-needle double-thread chain stitch.

[0012] The three-dimensional reinforced structured battery, wherein the material of a plurality of the first insulating fiber layers includes one or more of glass fiber, aramid fiber, and basalt fiber; and the material of a plurality of the second insulating fiber layers includes one or more of glass fiber, aramid fiber, and basalt fiber.

[0013] The three-dimensional reinforced structure battery, wherein the material of a plurality of the first reinforcing fiber layers includes one or more of carbon fiber, ceramic fiber, boron fiber, glass fiber, aramid fiber, and basalt fiber; and the material of a plurality of the second reinforcing fiber layers includes one or more of carbon fiber, ceramic fiber, boron fiber, glass fiber, aramid fiber, and basalt fiber.

[0014] The three-dimensional reinforced structure battery, wherein the battery layer includes a positive electrode layer, a negative electrode layer, and a separator and electrolyte composite layer sandwiched between the positive electrode layer and the negative electrode layer.

[0015] The three-dimensional reinforced structured battery, wherein the battery layer comprises a plurality of battery packs connected in series or in parallel.

[0016] In the three-dimensional reinforced structured battery, the area occupied by the reinforcing rib in the plane of the first insulating fiber layer is 5%-30% of the area of ​​the region where the reinforcing rib is located.

[0017] Beneficial Effects: This invention provides a three-dimensional reinforced structural battery, comprising, from bottom to top, a plurality of first reinforcing fiber layers, a plurality of first insulating fiber layers, a battery layer, a plurality of second insulating fiber layers, and a plurality of second reinforcing fiber layers; and a plurality of reinforcing ribs disposed through the plurality of first insulating fiber layers, the battery layer, and the plurality of second insulating fiber layers. This invention utilizes the method of reinforcement through the reinforcing ribs, constructing a three-dimensional cross-linked reinforcement network in the dimension perpendicular to the lamination direction, and using high-strength reinforcing ribs to form a multi-scale spatial anchoring system, which can significantly improve interlaminar shear strength and interfacial bonding force; furthermore, by reconstructing the mechanical transmission path to achieve uniform load distribution, it can maintain the integrity of electrochemical function while suppressing crack initiation and propagation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a three-dimensional reinforced battery according to the present invention;

[0019] Figure 2 This is a schematic diagram of a lockstitch.

[0020] Figure 3 This is a schematic diagram of the structural battery stitching.

[0021] Figure 4 The figures show the stress-strain curves of the unstitched and stitched structural batteries in Example 1. Detailed Implementation

[0022] This utility model provides a three-dimensional reinforced battery structure. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following provides a more detailed description of this utility model. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit this utility model.

[0023] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0024] Structural batteries are a disruptive energy storage technology that embeds batteries directly into the structural components of devices using composite materials (such as carbon fiber reinforced polymers) that combine high mechanical strength with energy storage capacity. This allows the batteries to simultaneously perform the dual functions of energy storage and mechanical support. This design overcomes the limitations of traditional stand-alone battery installation, significantly reducing system weight and optimizing space utilization. It holds great promise in fields requiring both lightweight design and efficient energy management, such as electric vehicles (integrated body and battery), aerospace (aircraft structure power generation and storage), and wearable devices (flexible and lightweight power supply). It is expected to drive the deep integration of sustainable energy and smart materials in the future.

[0025] However, composite material structure batteries may delaminate under external forces due to weak interlayer bonding between the glass fiber layer and the positive or negative electrode layer, or between the positive and negative electrodes and the battery separator.

[0026] Based on this, such as Figure 1As shown, this utility model provides a three-dimensional reinforced structural battery, including a plurality of first reinforcing fiber layers 10, a plurality of first insulating fiber layers 20, a battery layer 30, a plurality of second insulating fiber layers 40 and a plurality of second reinforcing fiber layers 50 stacked sequentially from bottom to top; and a plurality of reinforcing ribs 60 disposed through the plurality of first insulating fiber layers 20, the battery layer 30 and the plurality of second insulating fiber layers 40.

[0027] In this embodiment, by using a through-strength reinforcement method, a three-dimensional cross-linked reinforcement network is constructed in the dimension perpendicular to the lamination direction. High-strength reinforcement is used to form a multi-scale spatial anchoring system, which can significantly improve interlaminar shear strength and interfacial bonding force. Furthermore, by reconstructing the mechanical transmission path, uniform load distribution is achieved, which can suppress crack initiation and propagation while maintaining the integrity of electrochemical function.

[0028] Specifically, reinforcing ribs are introduced in the direction perpendicular to the reinforcing fiber layer, insulating fiber layer, and battery layer. The reinforcing ribs in the vertical direction strengthen the parts of the structural battery that are prone to delamination. Furthermore, the plane where the fiber and battery are located is defined as the XY plane, and the direction perpendicular to the XY plane is defined as the Z direction. Reinforcing ribs are introduced in the Z direction, passing through the first insulating fiber layer, battery layer, and second insulating fiber layer. When the structural battery is subjected to force in the Z direction, it plays a role in bearing the force and preventing interlaminar failure.

[0029] In some embodiments, the ratio of the diameter of the reinforcing rib to the diameter of the fiber bundle in the first reinforcing fiber layer is 0.5 to 3. Considering the practical application requirements of structural batteries, the load-bearing capacity of the structural battery can be adjusted by controlling the diameter of the reinforcing rib, thereby preventing interlaminar failure.

[0030] In a preferred embodiment, the ratio of the diameter of the reinforcing rib to the diameter of the fiber bundle in the first reinforcing fiber layer is 1.5 or 0.5.

[0031] In some embodiments, the reinforcing ribs are one or more of columnar insulating fibers, linear insulating fibers, columnar fibers with surface insulation treatment, and linear fibers with surface insulation treatment. Depending on the practical application of the structural battery, the type of reinforcing rib can be selected. Columnar reinforcing ribs are implanted through openings to achieve three-dimensional reinforcement of the structural battery, while linear reinforcing ribs are stitched together to achieve three-dimensional reinforcement.

[0032] Specifically, columnar or linear insulating fibers can be directly introduced into the lamination direction of the structural battery as reinforcing ribs without affecting the battery's performance; however, when non-insulating fibers are used as reinforcing ribs, their surfaces need to be insulated to prevent short circuits in the battery.

[0033] In a preferred embodiment, the reinforcing rib is made of linear glass fiber or columnar carbon fiber with surface insulation treatment.

[0034] In some embodiments, a plurality of the reinforcing ribs are arranged in a matrix and penetrate a plurality of the first insulating fiber layers, the battery layer, and the plurality of the second insulating fiber layers. The matrix-distributed reinforcing ribs can make the three-dimensional load-bearing structure of the structural battery uniform, improve the uniformity of the structural battery's load-bearing capacity, and thus prevent interlaminar failure.

[0035] In some embodiments, the reinforcing ribs penetrate several first insulating fiber layers, the battery layer, and several second insulating fiber layers using one of the following stitches: lock stitch, tufted stitch, blind stitch, or double-needle double-thread chain stitch. By manufacturing composite material structure batteries through fiber-through stitch reinforcement, reinforcing ribs can be introduced into the stacking direction of a two-dimensionally stacked structural battery, forming a three-dimensional load-bearing structure, thereby preventing interlayer failure.

[0036] In some implementations, such as Figure 2 As shown, the reinforcing ribs penetrate several first insulating fiber layers, the battery layer, and several second insulating fiber layers with lockstitch stitches, which is more conducive to reducing concentrated stress and improving interlayer damage tolerance. Compared with traditional lockstitch stitches, the improved lockstitch preform has no interlocking coils inside, reducing thread bending and wear between threads.

[0037] In some embodiments, the reinforcing ribs are also disposed through the first reinforcing fiber layers and the second reinforcing fiber layers to further improve the interlaminar shear strength and interfacial bonding force.

[0038] In some embodiments, when the reinforcing rib is used to reinforce the structural battery by stitching, the area occupied by the reinforcing rib in the plane of the first insulating fiber layer is 5%-30% of the area of ​​the region where the reinforcing rib is located.

[0039] In some embodiments, when the reinforcing ribs are used to reinforce the structural battery by stitching, the stitching pattern includes, but is not limited to, intersecting square patterns, diagonal lines, fragment patterns, etc.

[0040] In some embodiments, the material of the plurality of first insulating fiber layers includes one or more of glass fiber, aramid fiber, and basalt fiber; the material of the plurality of second insulating fiber layers includes one or more of glass fiber, aramid fiber, and basalt fiber. Using the first and second insulating layers as the covering layers of the battery layer can improve the load-bearing capacity of the structural battery, and the use of the aforementioned insulating fibers can prevent the covering layers from interfering with the battery.

[0041] In some implementations, such as Figure 3As shown, the battery layer includes several battery packs connected in series or in parallel, which are sandwiched together by the first insulating fiber layer and the second insulating fiber layer, and several reinforcing ribs are provided in the lamination direction to improve the load-bearing capacity while maintaining the original electrochemical performance of the battery.

[0042] In some embodiments, the materials of the first reinforcing fiber layers include one or more of carbon fiber, ceramic fiber, boron fiber, glass fiber, aramid fiber, and basalt fiber; the materials of the second reinforcing fiber layers include one or more of carbon fiber, ceramic fiber, boron fiber, glass fiber, aramid fiber, and basalt fiber. The first and second reinforcing fiber layers further enhance the load-bearing capacity of the structural battery, thereby further strengthening its mechanical strength.

[0043] In some embodiments, the battery layer includes a positive electrode layer, a negative electrode layer, and a separator and electrolyte composite layer sandwiched between the positive electrode layer and the negative electrode layer.

[0044] In some embodiments, the battery positive electrode layer includes a positive electrode current collector and a positive electrode material attached to the positive electrode current collector; the positive electrode current collector includes, but is not limited to, carbon fiber, copper foil, and aluminum foil.

[0045] In some embodiments, the battery negative electrode layer includes a negative electrode current collector and a negative electrode material attached to the negative electrode current collector; the negative electrode current collector includes, but is not limited to, carbon fiber, copper foil, and aluminum foil.

[0046] In some embodiments, the electrolyte in the membrane-electrolyte composite layer is a resin-based electrolyte, which may be, but is not limited to, other solid electrolytes such as sulfides or oxides.

[0047] In some embodiments, the separator in the electrolyte composite layer can be, but is not limited to, other materials used as battery separators (to prevent electrons from passing through ions), such as PP and cellulose.

[0048] In addition, this utility model also provides a method for fabricating a three-dimensional reinforced structured battery, including the following steps:

[0049] Step S10: Stack several first insulating fibers, battery layers and several second insulating fibers in sequence to obtain a composite layer;

[0050] Step S20: Use insulating needles and linear reinforcing ribs to stitch the lamination direction of the composite layer to obtain a stitched body;

[0051] Step S30: Several first reinforcing fibers and several second reinforcing fibers are respectively placed on both sides of the stitched body and placed in a mold. Resin is filled into the mold and cured. After curing, the mold is demolded to obtain a three-dimensional reinforced structural battery.

[0052] In this embodiment, the above-described preparation method can be used to obtain a stitched three-dimensional reinforced structure battery. By using insulating needles and linear reinforcing ribs, a composite layer consisting of several first insulating fibers, a battery layer, and several second insulating fibers can be stitched together. Reinforcing ribs are introduced in the stacking direction to form a three-dimensional load-bearing structure. Finally, by using reinforcing fibers and resin for further sealing treatment, the overall mechanical properties and load-bearing capacity of the structure battery are improved, thereby preventing interlayer failure.

[0053] In some embodiments, the materials and equipment used in the sewing process include insulating needles, fiberglass, and a tabletop sewing machine. The composite layers are sewn together using the tabletop sewing machine. Then, several first reinforcing fibers and several second reinforcing fibers are respectively placed on both sides of the sewn body, and laid on a glass plate that has been sprayed with a release agent. A release cloth and a flow guide net are then laid on top, and flow guide tubes and resin flow guide nozzles are arranged on the short side of the fiber area. Finally, a vacuum bag is covered over the entire area, and a vacuum is drawn. Then, the prepared resin is introduced into the vacuum bag. After the resin has completely impregnated the fibers, the flow is stopped, and the vacuum bag is kept under vacuum. The mixture is cured at room temperature for 24 hours, and then demolded to obtain a three-dimensional reinforced structural battery.

[0054] In addition, this invention also provides another method for fabricating a three-dimensional enhanced structured battery, including the following steps:

[0055] Step S100: A plurality of first reinforcing fiber layers, a plurality of first insulating fiber layers, a battery layer, a plurality of second insulating fiber layers and a plurality of second reinforcing fiber layers are stacked sequentially to obtain a three-dimensional reinforced structure battery precursor;

[0056] Step S200: Drill holes in the lamination direction of the three-dimensional reinforced structure battery precursor to obtain a three-dimensional reinforced structure battery precursor with through holes;

[0057] Step S300: Insert columnar reinforcing ribs into the through holes, and fill the interface between the columnar reinforcing ribs and the through holes with resin material. After curing, a three-dimensional reinforced structural battery is obtained.

[0058] In this embodiment, the above-described preparation method yields an implantable three-dimensional reinforced battery structure. By creating openings in the battery structure, implanting columnar reinforcing ribs, and then performing insulation and gap-filling treatments, a three-dimensional reinforced battery structure can be obtained. The three-dimensional reinforced battery structure obtained by this preparation method achieves uniform load distribution through mechanical transmission path reconstruction, which can suppress crack initiation and propagation while maintaining the integrity of electrochemical functions.

[0059] The following examples further illustrate the present invention in detail. It should also be understood that the following examples are only for further explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention are within the scope of protection of the present invention.

[0060] Example 1

[0061] This embodiment uses fiber stitching to introduce reinforcing ribs in the Z direction, as detailed below:

[0062] 1) Preparation of electrodes and electrolytes

[0063] Electrodes: A suitable positive and negative electrode slurry was prepared by thoroughly mixing active materials (lithium iron phosphate for the cathode and graphite for the anode), conductive carbon black, and PVDF in a weight ratio of 8:1:1, followed by the addition of an appropriate amount of NMP. The prepared positive and negative electrode slurries were then uniformly coated onto a flat layer of carbon fiber (0.1 mm thick), and heated in a vacuum drying oven at 80°C for 12 hours to obtain a two-dimensional planar carbon fiber positive and negative electrode structure.

[0064] Electrolyte and diaphragm: The glass fiber fabric is impregnated with resin-based electrolyte and pre-cured to achieve a state where the electrolyte does not flow randomly but is not fully cured and can be punctured by a needle, thus preventing disorderly flow of the electrolyte.

[0065] Specifically, the prepared electrolyte is placed at room temperature for 30-60 minutes for pre-curing, during which the resin components in the electrolyte will undergo a preliminary reaction and become gel-like; or the resin used in the electrolyte preparation process is a high-viscosity resin (above 2000 cps).

[0066] 2) Layup

[0067] Two layers of glass fiber, carbon fiber positive electrode, pre-cured electrolyte-glass fiber, carbon fiber negative electrode, and two layers of glass fiber are stacked in sequence. The carbon fiber positive electrode, pre-cured electrolyte-glass fiber, and carbon fiber negative electrode constitute a battery pack, and two battery packs connected in series are sandwiched between the glass fibers.

[0068] 3) Suturing

[0069] The materials and equipment used in the sewing process include insulated needles, fiberglass, and a tabletop sewing machine. The stitch chosen is a modified lockstitch (such as...). Figure 2 (As shown). Use a sewing machine to sew the 7 layers of fibers together, covering the area where the battery material is located (e.g., Figure 3 (As shown).

[0070] 4) Curing

[0071] Two layers of carbon fiber were placed on both sides of the sewn fiber and laid on a glass plate that had been sprayed with a release agent. A release cloth and a flow guide net were then laid on top. Flow guide tubes and resin flow guide nozzles were arranged on the short side of the fiber area. Finally, a vacuum bag was covered over the entire area and a vacuum was drawn. The prepared resin was then introduced into the vacuum bag. After the resin had completely impregnated the fiber, the flow was stopped, and the vacuum bag was kept under vacuum. The mixture was cured at room temperature for 24 hours to obtain a three-dimensional reinforced structural battery.

[0072] Using the same method described above but without stitching, a structural cell was obtained as a control group. Stress-strain tests were performed on this control cell. The stress-strain curves of the unstitched structural cell (control) and the stitched structural cell (stitching) are shown in the figure below. Figure 4 As shown, the mechanical properties of the composite laminate decrease significantly after being embedded in a commercial thin-film battery. The embedding of the battery cell significantly reduces the interlayer bonding force between the upper and lower fibers of the battery, and obvious delamination occurs under external force. By stitching the fiber lines in the area where the battery cell is located, the composite material with a two-dimensional fiber distribution is constrained in the vertical direction, making it a three-dimensional structure. This strengthens the interlayer bonding force of the composite material and suppresses the occurrence of delamination.

[0073] Example 2

[0074] In this embodiment, columnar carbon fiber rods are used to introduce reinforcing ribs in the Z direction, as detailed below:

[0075] 1) Battery manufacturing: Here, the battery is mainly responsible for electrochemical energy storage. It can be a carbon fiber current collector, a resin-based solid electrolyte battery, or a solid-state battery with plastic soft-pack packaging.

[0076] 2) Preparation of columnar carbon fiber rods

[0077] Carbon fiber bundle: T800 grade 12K carbon fiber, with surface roughness increased by nitric acid etching (Ra increased from 0.5 to 2.1μm).

[0078] Pretreatment: Heat treatment at 450℃ under nitrogen atmosphere to remove organic impurities;

[0079] Gradient insulation coating was applied to the heat-treated carbon fiber bundles: First, amorphous Al2O3 (thickness 500 nm, growth rate 0.1 nm / cycle, 250℃) was deposited by ALD on the heat-treated carbon fiber bundles as the bottom layer. Then, a SiO2-TiO2 hybrid coating (thickness 2 μm, dielectric strength 30 kV / mm) was coated by sol-gel method as the intermediate layer. Finally, epoxy resin containing BN nanosheets (30 wt% filler, thermal conductivity 5 W / m·K) was used as the outer layer.

[0080] Molding process: A 1.2mm diameter rod is made using three-dimensional weaving technology, followed by vacuum pressure impregnation (0.8MPa) and high-temperature curing (180℃ / 2h). Finally, the surface is treated with plasma (Ar / O2 mixed gas) to improve the bonding force with the matrix, resulting in columnar carbon fiber rods.

[0081] 3) Combination

[0082] Lamination sequence: carbon fiber composite outer layer (2 layers of E-glass / bismaleimide) → positive electrode → membrane and electrolyte composite layer → negative electrode → carbon fiber composite outer layer (2 layers of E-glass / bismaleimide).

[0083] Pre-drilling positioning: Laser-induced breakdown is used to prepare 0.8mm guide holes (3mm spacing hexagonal close-packed holes).

[0084] Reinforcing bar implantation: The columnar carbon fiber rod is inserted with the aid of ultrasonic vibration (frequency 28kHz, amplitude 50μm), and the implantation depth error is <20μm.

[0085] Interface filling: Low viscosity epoxy silicone resin (viscosity 200 cP, volume shrinkage rate <0.5%) is injected into the gap between the reinforcing rib and the hole.

[0086] Isolation and protection: An annular insulating groove (0.1 mm deep) is made in the electrode-reinforcing rib contact area and filled with BN / epoxy composite material to obtain a three-dimensional reinforced structural battery.

[0087] In summary, this invention provides a three-dimensional reinforced structural battery, comprising, from bottom to top, a plurality of first reinforcing fiber layers, a plurality of first insulating fiber layers, a battery layer, a plurality of second insulating fiber layers, and a plurality of second reinforcing fiber layers; and a plurality of reinforcing ribs disposed through the plurality of first insulating fiber layers, the battery layer, and the plurality of second insulating fiber layers. This invention utilizes the method of reinforcement through the reinforcing ribs, constructing a three-dimensional cross-linked reinforcement network in the dimension perpendicular to the lamination direction, and using high-strength reinforcing ribs to form a multi-scale spatial anchoring system, which can significantly improve interlaminar shear strength and interfacial bonding force; furthermore, by reconstructing the mechanical transmission path to achieve uniform load distribution, it can maintain the integrity of electrochemical function while suppressing crack initiation and propagation.

[0088] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A three-dimensional reinforced battery structure, characterized in that, It includes a plurality of first reinforcing fiber layers, a plurality of first insulating fiber layers, a battery layer, a plurality of second insulating fiber layers and a plurality of second reinforcing fiber layers stacked sequentially from bottom to top; and a plurality of reinforcing ribs disposed through the plurality of first insulating fiber layers, the battery layer and the plurality of second insulating fiber layers.

2. The three-dimensional reinforced battery structure according to claim 1, characterized in that, The ratio of the diameter of the reinforcing rib to the diameter of the fiber bundle in the first reinforcing fiber layer is 0.5 to 3.

3. The three-dimensional reinforced battery structure according to claim 1, characterized in that, The reinforcing rib is one or more of the following: columnar insulating fiber, linear insulating fiber, columnar fiber with surface insulation treatment, and linear fiber with surface insulation treatment.

4. The three-dimensional reinforced battery structure according to claim 1, characterized in that, The reinforcing ribs are arranged in a matrix and penetrate several first insulating fiber layers, battery layers and several second insulating fiber layers.

5. The three-dimensional reinforced battery structure according to claim 1, characterized in that, The reinforcing rib is formed by one of the following: lock stitch, tufted stitch, blind stitch, or double-needle double-thread chain stitch, which runs through several first insulating fiber layers, the battery layer, and several second insulating fiber layers.

6. The three-dimensional reinforced battery structure according to claim 1, characterized in that, The material of some of the first insulating fiber layers includes one or more of glass fiber, aramid fiber, and basalt fiber; the material of some of the second insulating fiber layers includes one or more of glass fiber, aramid fiber, and basalt fiber.

7. The three-dimensional reinforced battery structure according to claim 1, characterized in that, The materials of some of the first reinforcing fiber layers include one or more of carbon fiber, ceramic fiber, boron fiber, glass fiber, aramid fiber, and basalt fiber; the materials of some of the second reinforcing fiber layers include one or more of carbon fiber, ceramic fiber, boron fiber, glass fiber, aramid fiber, and basalt fiber.

8. The three-dimensional reinforced battery structure according to claim 1, characterized in that, The battery layer includes a positive electrode layer, a negative electrode layer, and a separator and electrolyte composite layer sandwiched between the positive electrode layer and the negative electrode layer.

9. The three-dimensional reinforced battery structure according to claim 1, characterized in that, The battery layer includes several battery packs connected in series or in parallel.

10. The three-dimensional reinforced battery structure according to claim 1, characterized in that, The area occupied by the reinforcing rib in the plane of the first insulating fiber layer is 5%-30% of the area of ​​the region where the reinforcing rib is located.

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