Thermoplastic structural resin electrolyte and carbon fiber composite structural battery and method of manufacture

Abstract

The present application relates to a kind of thermoplastic structural resin electrolyte and carbon fiber composite material structure battery and preparation method, carbon fiber composite material is simultaneously used as electrochemical energy storage and mechanical bearing structure, realizes the integration processing forming of energy storage unit and force component.The thermoplastic structural resin electrolyte uses cellulose derivative as structure skeleton, polyether polymer as ion conducting phase, by the composite of both, realize higher ionic conductivity and good mechanical property.The composite electrolyte can be directly formed by thermoplastic moulding process and carbon fiber base structure electrode, process is simple and easy to scale.The prepared carbon fiber composite material structure battery keeps excellent mechanical property, at the same time, has reliable energy storage performance, and shows outstanding recyclability and reworkability, can be manufactured into various complex shape structural members by secondary forming, is suitable for electric vehicle, aerospace and other fields requiring high light weight and space utilization.

Description

Technical Field

[0001] This invention belongs to the field of carbon fiber composite materials and electrochemical energy storage technology, specifically relating to a recyclable and remodelable thermoplastic structural resin electrolyte, a carbon fiber composite material structure battery, and a preparation method thereof. Background Technology

[0002] In recent years, carbon fiber composite battery structures, as a multifunctional composite material capable of simultaneously bearing mechanical loads and storing electrical energy, have attracted widespread attention in aerospace, new energy vehicles, and portable electronic devices. Traditional lithium-ion batteries typically coat electrode active materials onto metal current collectors and encapsulate liquid electrolytes in an aluminum-plastic film. While possessing high energy density, they lack load-bearing capacity and are often installed as independent battery units, with additional packaging materials increasing system weight and space occupation. To achieve lightweight devices and efficient space utilization, integrating the energy storage function of carbon fiber composite materials with load-bearing structures, and developing integrated energy-structure components that combine energy storage and mechanical support performance, has become an important trend.

[0003] However, existing carbon fiber composite battery technologies still face significant challenges. Most current research is based on thermosetting polymer electrolyte systems, such as epoxy resin-based composites. While these provide some structural stiffness, they generally suffer from low ionic conductivity and high interfacial impedance, limiting their electrochemical performance. Furthermore, while introducing liquid electrolytes or ionic liquids can improve the ion transport capacity of epoxy resins, it often sacrifices the material's mechanical properties and interfacial stability, making it difficult to simultaneously achieve high ionic conductivity with high strength and high modulus. More importantly, thermosetting resin materials form permanent cross-linked networks after curing, making secondary processing or efficient recycling impossible. This results in difficulties in separating and reusing high-value components (such as carbon fiber-based electrodes) after the battery's lifespan, leading to resource waste and increased environmental burden. Simultaneously, existing carbon fiber composite battery structures typically have fixed shapes after molding, lacking the ability to be reshaped for complex configurations, limiting their integrated application in irregularly shaped load-bearing components (such as car hoods and wheel hubs).

[0004] Therefore, there is an urgent need to develop a new type of carbon fiber composite material battery system that not only possesses excellent mechanical properties and reliable energy storage capacity, but also has the potential to fundamentally solve the problems of material recyclability and reprocessability. This would enable the sustainable design and manufacturing of integrated energy storage and load-bearing devices, providing a practical technical solution for the next generation of high-performance, lightweight, and integrated energy structure systems. Summary of the Invention

[0005] Addressing the key issues of existing thermosetting structural electrolytes being non-reprocessable, difficult to recycle, and the inability to synergistically improve the mechanical and electrochemical properties of structural batteries, this invention aims to provide a recyclable and remodelable thermoplastic structural resin electrolyte and its preparation method, as well as an integrated molding technology and application of structural batteries based on this electrolyte, in order to promote the development of high-performance, sustainable energy-structure integrated systems.

[0006] A method for preparing a battery with a carbon fiber composite material structure includes the following steps: Step 1: Preparation of thermoplastic structural resin electrolyte membrane: The ion-conducting polymer solution and the reinforcing resin solution are mixed at a preset mass ratio, cast into a film, and after solvent evaporation and vacuum drying, a thermoplastic structural resin electrolyte membrane is obtained. Step 2: Layer-by-layer design of structural battery module: structural resin electrolyte membrane, carbon fiber-based structural negative electrode, structural resin electrolyte membrane, glass fiber separator, structural resin electrolyte membrane, carbon fiber-based structural positive electrode and structural resin electrolyte membrane; Step 3: Thermoplastic molding: The battery layers are placed in a hot press and hot-pressed under preset pressure and temperature to complete the thermoplastic molding of the structural battery. Step 4, Post-processing: Store the shaped battery in an inert atmosphere. Step 5, Closed-loop recycling and reuse: The used structural battery is recycled by dissolving the thermoplastic structural resin electrolyte with a solvent to separate and recycle the carbon fiber electrode material; Step 6, Secondary Reshaping and Molding: The structural battery is subjected to thermoplastic molding again to reshape it into a complex irregular structural component of a preset shape.

[0007] A carbon fiber composite material structure battery uses carbon fiber composite material as both an electrochemical energy storage and mechanical load-bearing structure. The energy storage unit and the load-bearing component are integrally formed. Under room temperature and 0.1 C charge-discharge conditions, it can stably cycle more than 50 times with a capacity retention rate of 70.2%, a tensile strength of 369.85 MPa, and a Young's modulus of 23.34 GPa.

[0008] A thermoplastic structural resin electrolyte is composed of polyethylene oxide as the ion-conducting phase and cellulose acetate as the structural reinforcing phase, which is compounded by solution blending and a controllable film-forming process. The thickness is 300±50 μm. The ionic conductivity and Young's modulus are controlled by the mass ratio of polyethylene oxide and cellulose acetate. When the mass ratio of polyethylene oxide to cellulose acetate is 7:3, the ionic conductivity reaches 0.39 mS cm⁻¹ and the Young's modulus reaches 0.71 GPa.

[0009] The thermoplastic structural resin electrolyte and carbon fiber composite material structure battery provided by this invention has the following outstanding advantages compared with the prior art: (1) At the material level, this invention successfully achieves a synergistic improvement in structural and electrochemical performance, and fundamentally endows the material with a recyclable life cycle. Traditional structural batteries generally use thermosetting epoxy resin as the electrolyte matrix. Although the three-dimensional cross-linked network formed after curing can provide a certain rigidity, it leads to high ion migration resistance, low conductivity, and the inability to be reprocessed or degraded for recycling. This invention innovatively uses PEO and CA to construct a thermoplastic composite system. Among them, the PEO phase, as an efficient ion transport channel, ensures excellent ionic conductivity; while the CA phase, as a rigid structural skeleton, provides excellent tensile strength and modulus. The two are combined at the molecular level, breaking the performance trade-off of "high strength equals low conductivity" in the traditional system. More importantly, the thermoplastic matrix can be dissolved in the presence of solvents. This characteristic allows the electrolyte and carbon fiber-based electrode to be cleanly separated from the battery through simple heat treatment, thereby completely recovering the high-value carbon fiber material and solving the key problems of difficult recycling and resource waste in traditional structural batteries.

[0010] (2) At the product and application level, this invention achieves efficient integrated integration of energy storage units and load-bearing structures, and expands unprecedented design freedom and application scenarios. The structural battery described in this invention is not simply an embedding of traditional battery cells into structural components, but rather a thermoplastic molding process that allows thermoplastic resin electrolytes to be directly composited with carbon fiber-based structural electrodes and separators in a molten state, forming a composite material with strong interfacial bonding, continuous ion channels, and uniform mechanical properties. This integrated molding process not only simplifies the manufacturing steps but also significantly improves the integrity and reliability of the battery as a structural component. Based on the inherent characteristics of thermoplastic electrolytes, the molded carbon fiber composite structural battery still possesses "thermoplasticity" and can be easily reprocessed into various complex shapes (such as car hoods, wheel hubs, etc.) through secondary thermoplastic molding, just like traditional thermoplastic composite materials. This means that energy storage functions can be directly designed and integrated into the final load-bearing form without sacrificing the optimality of structural design to adapt to standard battery shapes. This provides a disruptive solution to the fundamental contradiction between space and weight in lightweight systems, greatly promoting the deep integration and commercial application prospects of energy storage and structural systems in high-end fields such as electric vehicles and aerospace. Attached Figure Description

[0011] Figure 1 Schematic diagram of optical photographs and scanning electron microscope images; Figure 1 Image a is an optical photograph of the thermoplastic resin electrolyte membrane provided by this invention. Figure 1The images in the middle (bd) are scanning electron microscope (SEM) images of the electrolyte membrane, the carbon fiber-based electrode, and the cross-section of the structural battery provided in this invention, respectively.

[0012] Figure 2 This is a flowchart illustrating the fabrication process of a carbon fiber composite material structure battery.

[0013] Figure 3 This is a schematic diagram of the structure for electrochemical and mechanical performance testing. Figure 3 In Figure 'a', the circuit diagram of the structural battery is shown. Figure 3 Image b in the middle is a photograph of a structural battery application.

[0014] Figure 4 Displaying batteries with different shapes. Detailed Implementation Plan

[0015] To make the technical problems solved, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention. Any supplements, equivalent substitutions, or modifications made within the technical scope of this invention should be included within the protection scope of this invention.

[0016] This invention provides a thermoplastic structural resin electrolyte. This electrolyte is composed of a polyether polymer with high ionic conductivity and a cellulose derivative as a structural reinforcing phase. It possesses both excellent ion transport capabilities and superior mechanical properties, and can be softened and molded under hot pressing or repeatedly processed, thus significantly improving the shortcomings of traditional thermosetting structural resin electrolyte systems that cannot be reshaped after molding.

[0017] This invention provides a method for preparing the aforementioned thermoplastic structural resin electrolyte. This method, through solution blending and a controllable film-forming process, regulates the distribution and interfacial bonding of the ionicly conductive phase and the structurally reinforcing phase at the molecular scale. While ensuring high ionic conductivity of the electrolyte, it significantly improves its mechanical strength and modulus, achieving synergistic optimization of electrochemical and structural properties.

[0018] This invention provides a carbon fiber composite material structure battery based on the aforementioned thermoplastic structural resin electrolyte and its integrated molding method. This method efficiently integrates the carbon fiber-based structural electrode with the thermoplastic resin electrolyte under specific temperature and pressure conditions through a hot-pressing process, achieving tight interfacial bonding between the battery's internal components and structural-functional integration, enabling the battery to achieve efficient energy storage while bearing mechanical loads.

[0019] This invention relates to the application of carbon fiber composite material structure batteries in lightweight integrated energy systems. These batteries not only possess excellent safety and cycle stability, but can also be further processed into complex-shaped structural components using hot pressing, making them suitable for applications such as electric vehicles and aerospace, demonstrating significant technological advancement and commercial potential.

[0020] A method for preparing a battery with a carbon fiber composite material structure includes the following steps: Step 1: Preparation of thermoplastic structural resin electrolyte membrane: The ion-conducting polymer solution and the reinforcing resin solution are mixed at a preset mass ratio, cast into a film, and after solvent evaporation and vacuum drying, a thermoplastic structural resin electrolyte membrane is obtained. Step 2: Layer-by-layer design of structural battery module: structural resin electrolyte membrane, carbon fiber-based structural negative electrode, structural resin electrolyte membrane, glass fiber separator, structural resin electrolyte membrane, carbon fiber-based structural positive electrode and structural resin electrolyte membrane; Step 3: Thermoplastic molding: The battery layers are placed in a hot press and hot-pressed under preset pressure and temperature to complete the thermoplastic molding of the structural battery. Step 4, Post-processing: Store the shaped battery in an inert atmosphere. Step 5, Closed-loop recycling and reuse: The used structural battery is recycled by dissolving the thermoplastic structural resin electrolyte with a solvent to separate and recycle the carbon fiber electrode material; Step 6, Secondary Reshaping and Molding: The structural battery is subjected to thermoplastic molding again to reshape it into a complex irregular structural component of a preset shape.

[0021] Preferably, step one of the present invention specifically includes: (1) Preparation of ion-conducting polymer solution: Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and polyethylene oxide (PEO) are dissolved in... N,N In dimethylformamide (DMF), the mass ratio of the three components is 1:9:90, resulting in solution A; (2) Preparation of reinforcing phase resin solution: Dissolve cellulose acetate (CA) in DMF at a mass ratio of 10:90 to obtain solution B; (3) Solution mixing: Mix solution A and solution B at any one of the following mass ratios: 10:0, 7:3, 5:5, 3:7 or 0:10, and stir until uniform and transparent; (4) Film formation and pre-drying: The mixed solution is poured into a polytetrafluoroethylene mold and left to stand in an inert atmosphere at 25±2 ℃ for 12 h to allow the solvent to partially evaporate and form a nascent film. (5) Vacuum drying: The nascent membrane was vacuum dried at 80 °C and a pressure of less than 0.1 kPa for 24 h to obtain a structural resin electrolyte membrane with a thickness of 300±50 μm; (6) Storage: Store the dried structural resin electrolyte membrane in an inert atmosphere with both water and oxygen content below 0.1 ppm.

[0022] Preferably, in step two of the present invention, the dimensions of the carbon fiber-based negative electrode and positive electrode are set according to the battery structure design.

[0023] Preferably, in step three of the present invention, the thermoplastic molding includes programmed heating at a pressure of 1–10 MPa, a heating rate of 1–20 ℃ / min, a maximum temperature of 80–150 ℃, and a holding time of 10–60 min.

[0024] Preferably, the inert atmosphere in step four of the present invention is an argon atmosphere.

[0025] Preferably, step five of the present invention includes a carbon fiber recycling step: placing the used carbon fiber composite material structure battery in a solvent to dissolve the thermoplastic structural resin electrolyte, thereby achieving the separation and recycling of the carbon fiber-based electrode material.

[0026] Preferably, the solvent used for carbon fiber recycling in step five of this invention is... N,N - One or a mixture of two of dimethylformamide and acetone.

[0027] The carbon fiber composite material structure battery obtained by the preparation method of the present invention can be re-processed into a pre-set irregular structure by means of the thermoplastic structural resin electrolyte through thermoplastic molding process.

[0028] The carbon fiber composite material structure battery obtained based on the preparation method of the present invention retains more than 80% of its initial mechanical properties after at least two recycling treatments and two remolding cycles.

[0029] This invention discloses a method for preparing a recyclable and remodelable thermoplastic structural resin electrolyte and its carbon fiber composite material structure battery.

[0030] This embodiment aims to illustrate the specific preparation method of the thermoplastic structural resin electrolyte membrane of the present invention, and to verify the influence of different component ratios on its performance.

[0031] (1) Raw materials and equipment: LiTFSI (battery grade), PEO (M w= 600,000), CA (acetyl content 39.8%), DMF (anhydrous grade). Magnetic stirrer, PTFE mold, glove box (water and oxygen content <0.1 ppm), vacuum drying oven.

[0032] (2) Preparation process: Prepare solution A (ion-conducting phase): Weigh the raw materials according to the mass ratio of LiTFSI : PEO : DMF = 1 : 9 : 90, stir in a glove box until completely dissolved, and obtain a homogeneous and transparent solution; Prepare solution B (reinforcing phase): Weigh the raw materials according to the mass ratio of CA : DMF = 10 : 90, stir in a glove box until completely dissolved, and obtain a homogeneous and transparent solution.

[0033] (3) Blending and Film Formation: Solution A and solution B were mixed according to the mass ratios listed in Table 1 and stirred for 12 h until homogeneous and transparent. The mixed solution was poured into a polytetrafluoroethylene mold and left to stand in a glove box (25±2 ℃) for 12 h to allow partial evaporation of the solvent. The nascent membrane was then transferred to a vacuum drying oven and dried for 24 h at 80 ℃ and a pressure below 0.1 kPa to completely remove residual solvent, resulting in a self-supporting electrolyte membrane with a thickness of approximately 300±50 μm (e.g., ...). Figure 1 (ab). The prepared electrolyte membranes were labeled as PEO, PEO7 / CA3, PEO5 / CA5, PEO3 / CA7, and CA, and stored in an argon-filled glove box for later use.

[0034]

[0035] Data shows that when the mass ratio of PEO to CA is 7:3, the prepared PEO7 / CA3 electrolyte membrane achieves the best balance between ionic conductivity and mechanical properties, and is identified as the preferred embodiment for subsequent battery assembly.

[0036] Example 2: Assembly and electrochemical performance testing of carbon fiber composite material structure battery This embodiment aims to illustrate the process of assembling a battery using the preferred electrolyte membrane (PEO7 / CA3) from Example 1 and the electrochemical performance of the resulting battery.

[0037] (1) Battery assembly preparation: Electrode: Carbon fiber fabric is used as the electrode matrix. The slurry is prepared according to the ratio of active material: conductive carbon black: polyvinylidene fluoride binder = 7:2:1. The positive electrode is LiFePO4 (LFP) and the negative electrode is Li4Ti5O. 12 LTO (Lithium-methylpyrrolidone) was used as the solvent. The active material was coated onto both sides of carbon fiber using a doctor blade to obtain LTO@CF anodes and LFP@CF cathodes. The electrode cross-sections are shown below. Figure 1In step c, the electrode slurry is uniformly adhered to the carbon fiber. The separator is a glass fiber (GF) separator. The electrolyte membrane is the PEO7 / CA3 membrane prepared in Example 1.

[0038] (2) Hot-press integrated assembly: See Figure 2 This demonstrates the complete fabrication process of the battery structure of the present invention. Specifically, the layers are laid in the following order: PEO7 / CA3 film, carbon fiber-based negative electrode, PEO7 / CA3 film, glass fiber separator, PEO7 / CA3 film, carbon fiber-based positive electrode, and PEO7 / CA3 film. Then, it is placed between the plates of a hot press, subjected to a constant pressure of 5 MPa, and heated according to a programmed sequence: at 10... o C / min from 30 o The temperature is increased to 80 °C, then increased to 120 °C at a rate of 5 °C / min, and held at 120 °C for 20 min. Afterward, it is allowed to cool naturally to room temperature, and demolded to obtain the integrated carbon fiber composite material structure battery, whose cross-sectional structure is as follows. Figure 1 As shown in d.

[0039] (3) Electrochemical and mechanical performance testing Coin cell battery testing: The composite electrode / electrolyte unit from the above-described battery structure was cut into circular pieces and assembled into CR2032 coin cells for testing. Under charge / discharge conditions of 25 ℃ and 0.1 C, the test results are as follows: Figure 3 As shown in Figure a, the battery can stably cycle more than 50 times with a capacity retention of 70.2%. Meanwhile, the practicality of this battery was verified, such as... Figure 3 As shown in Figure b, the battery can successfully drive the small fan to work normally, proving that it has good actual discharge capability.

[0040] Mechanical properties: Standard tensile specimens were cut from the molded structural battery and tested for tensile strength and Young's modulus, which were 369.85 MPa and 23.34 GPa, respectively, proving that it has excellent mechanical load-bearing properties.

[0041] Example 3: Demonstration of recycling and reprocessing of carbon fiber composite material structure batteries This embodiment aims to demonstrate the recyclability and reprocessability of the carbon fiber composite material structure battery of the present invention.

[0042] (1) Recycling of carbon fiber-based electrodes: The carbon fiber composite material structure battery described in Example 2, which failed after cyclic testing, was placed sequentially in DMF and AC solvents. After the resin dissolved, it peeled off from the carbon fiber-based electrode at the interface. Through simple mechanical separation and cleaning, complete and clean carbon fiber fabric could be recycled. The recycled carbon fiber was reassembled into a structural battery, and its mechanical strength retention rate was over 94%.

[0043] (2) Secondary thermoplastic molding of battery components: A newly prepared flat-shaped battery (size: 10 cm × 10 cm) is placed into a mold with an arc-shaped surface (simulating a partial shape of a car hood). The mold is placed in a hot press and heated to 120 °C under a pressure of 5 MPa and held at that temperature for 20 min. After cooling and demolding, the flat-shaped battery is successfully reprocessed into a predetermined curved surface component (such as...). Figure 4 ).

[0044] Comparative Example: This comparative example uses a conventional thermosetting electrolyte system to construct a structural battery, in order to compare the advantages of thermoplastic electrolyte systems in terms of recycling and processing performance.

[0045] 1. Electrolyte preparation: Ethylene glycol dimethacrylate (BEMA) and electrolyte (1M LiTFSI in EC:PC=1:1 vol%) were mixed at a mass ratio of 1:1, and 1 wt.% azobisisobutyronitrile (AIBN) was added as an initiator. After thorough stirring, the mixture was poured into a polytetrafluoroethylene mold and cured at 90 °C for 1 h to obtain a solid electrolyte membrane with a thickness of about 300 μm.

[0046] 2. Structural Battery Assembly: The carbon fiber composite structural battery is laid up in the following order: carbon fiber-based negative electrode, glass fiber separator, and carbon fiber-based positive electrode. The BEMA / electrolyte system is introduced by vacuum infusion, followed by curing at 90 °C for 1 h to complete the overall battery molding.

[0047] 3. Electrochemical Performance Comparison: The obtained thermosetting resin electrolyte membrane exhibits a typical cross-linked network structure, where ion transport mainly relies on the permeation and diffusion process of the liquid electrolyte phase. Restricted polymer chain movement leads to limited ion migration, relatively low ionic conductivity, and somewhat limited cycle stability. In contrast, the PEO / CA thermoplastic composite electrolyte used in this invention possesses continuous ion transport channels and high polymer chain flexibility, significantly promoting lithium-ion transport. Its room-temperature ionic conductivity is approximately one order of magnitude higher than the comparative example. The structural battery constructed based on this electrolyte maintains stable capacity output after 50 cycles at 0.1 C, demonstrating excellent electrochemical cycling performance with a capacity retention of approximately 10%.

[0048] 4. Recycling and Reuse Performance: Because the BEMA-based electrolyte forms a three-dimensional cross-linked thermosetting polymer network after curing, the material is difficult to melt or dissolve under thermal or conventional solvent conditions. Consequently, it is difficult to effectively separate and recycle the electrodes and electrolyte in structural battery modules. Although chemical degradation using strong acids or alkalis can destroy the polymer network, the process is complex and poses a potential corrosion risk to the carbon fiber matrix, thus limiting its recycling feasibility.

[0049] 5. Reprocessing and Remodeling Performance: The cured thermosetting battery exhibits an overall rigid structure. Under heating and pressurization conditions, this system exhibits brittle cracking behavior before reaching the decomposition temperature, making controlled deformation processing difficult. Therefore, compared with the thermoplastic electrolyte system proposed in this invention, thermosetting batteries have significant limitations in secondary thermoforming and structural remodeling.

[0050] Conclusion: Through comparison of the embodiments and comparative examples of the present invention, it is fully demonstrated that the thermoplastic structural resin electrolyte and its carbon fiber composite material structure battery provided by the present invention, while maintaining excellent electrochemical and mechanical properties, successfully solves the key technical problems inherent in traditional thermosetting resin systems that are not recyclable and not reprocessable, and achieves a balance between performance and sustainability.

Claims

1. A method for preparing a carbon fiber composite material structure battery, characterized in that, Includes the following steps: Step 1: Preparation of thermoplastic structural resin electrolyte membrane: The ion-conducting polymer solution and the reinforcing resin solution are mixed at a preset mass ratio, cast into a film, and after solvent evaporation and vacuum drying, a thermoplastic structural resin electrolyte membrane is obtained. Step 2: Layer-by-layer design of structural battery module: Lay out the following layers in the order of structural resin electrolyte membrane, carbon fiber-based structural negative electrode, structural resin electrolyte membrane, glass fiber separator, structural resin electrolyte membrane, carbon fiber-based structural positive electrode, and structural resin electrolyte membrane. Step 3: Thermoplastic molding: The battery layers are placed in a hot press and hot-pressed under preset pressure and temperature to complete the thermoplastic molding of the structural battery. Step 4, Post-processing: Store the shaped battery in an inert atmosphere. Step 5, Closed-loop recycling and reuse: The used structural batteries are recycled by dissolving the thermoplastic structural resin electrolyte with a solvent to separate and recycle the carbon fiber electrode material. Step 6, Secondary Reshaping and Molding: The structural battery is subjected to thermoplastic molding again to reshape it into a complex irregular structural component of a preset shape.

2. The preparation method according to claim 1, characterized in that, Step one specifically includes: (1) Preparation of ion-conducting polymer solution: Lithium bis(trifluoromethanesulfonyl)imide and polyethylene oxide are dissolved in N,N-dimethylformamide in a mass ratio of 1:9:90 to obtain solution A; (2) Preparation of reinforcing phase resin solution: Dissolve cellulose acetate in N,N-dimethylformamide at a mass ratio of 10:90 to obtain solution B; (3) Solution mixing: Mix solution A and solution B at any one of the following mass ratios: 10:0, 7:3, 5:5, 3:7 or 0:10, and stir until uniform and transparent; (4) Film formation and pre-drying: The mixed solution is poured into a polytetrafluoroethylene mold and left to stand in an inert atmosphere at 25±2 ℃ for 12 h to allow the solvent to partially evaporate and form a nascent film. (5) Vacuum drying: The nascent membrane was vacuum dried at 80 °C and a pressure below 0.1 kPa for 24 h to obtain a structural resin electrolyte membrane with a thickness of 300±50 μm; (6) Storage: Store the dried structural resin electrolyte membrane in an inert atmosphere with both water and oxygen content below 0.1 ppm.

3. The preparation method according to claim 1, characterized in that, In step two, the dimensions of the carbon fiber-based negative electrode and the carbon fiber-based positive electrode are adapted to meet the battery structure design requirements.

4. The preparation method according to claim 1, characterized in that, In step three, the process parameters for thermoplastic compression molding are: programmed heating at a pressure of 1–10 MPa, a heating rate of 1–20 ℃ / min, a maximum temperature of 80–150 ℃, and a holding time of 10–60 min at the maximum temperature.

5. The preparation method according to claim 1, characterized in that, The inert atmosphere in step four is an argon atmosphere.

6. The preparation method according to claim 1, characterized in that, The solvent in step five is one of N,N-dimethylformamide and acetone, or a mixture of N,N-dimethylformamide and acetone.

7. The preparation method according to any one of claims 1-6, characterized in that, The prepared carbon fiber composite material structure battery relies on the thermoplasticity of the thermoplastic structural resin electrolyte and can be processed into irregular structural parts of any preset shape through thermoplastic molding process.

8. The preparation method according to any one of claims 1-6, characterized in that, The prepared carbon fiber composite structure battery retains more than 80% of its initial mechanical properties after at least two recycling treatments and two remolding cycles.

9. A carbon fiber composite material structure battery, characterized in that, Carbon fiber composite material is used as both an electrochemical energy storage and mechanical load-bearing structure. The energy storage unit and the load-bearing component are integrally molded. It can stably cycle more than 50 times under room temperature 0.1 C charge and discharge conditions with a capacity retention rate of 70.2%, a tensile strength of 369.85 MPa, and a Young's modulus of 23.34 GPa.

10. A thermoplastic structural resin electrolyte, characterized in that, Using polyethylene oxide as the ion-conducting phase and cellulose acetate as the structural reinforcement phase, a composite material with a thickness of 300±50 μm was formed through solution blending and a controllable film-forming process. The ionic conductivity and Young's modulus were controlled by the mass ratio of polyethylene oxide to cellulose acetate. When the mass ratio of polyethylene oxide to cellulose acetate was 7:3, the ionic conductivity reached 0.39 mS cm⁻¹ and the Young's modulus reached 0.71 GPa.

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