Fiber battery with electrodes arranged in honeycomb shape and preparation method of fiber battery

Abstract

The invention relates to the technical field of fiber batteries, in particular to a fiber battery with electrodes arranged in a honeycomb shape and a preparation method thereof, the preparation method is as follows: fiber electrodes are arranged in a multi-layer mode, fiber positive electrode layers and fiber negative electrode layers are arranged at intervals, and diaphragms are arranged between the fiber positive electrode layers and the fiber negative electrode layers; the fiber positive electrode layer is formed by extending and arranging a plurality of parallel fiber positive electrodes along the axial direction of the fiber battery, and the fiber negative electrode layer is formed by extending and arranging a plurality of parallel fiber negative electrodes along the axial direction of the fiber battery; the fiber positive electrode, the fiber negative electrode and the diaphragm are arranged in at least one stage of shaping mold, then enter at least one stage of reducing mold to be subjected to tightening treatment, then are sleeved with a packaging pipe, and are packaged after electrolyte is injected, so that the fiber battery is obtained. The fiber battery prepared by the invention can keep good flexibility and has higher battery capacity, continuous production can be realized, the production efficiency is improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This invention relates to a fiber battery with honeycomb-shaped electrode arrangement and its preparation method, belonging to the field of fiber battery technology. Background Technology

[0002] Flexible wearable electronic devices have attracted widespread attention due to their promising prospects in fields such as medicine, health, monitoring, information, and interaction. Energy supply, as a core component, is crucial for the functional realization of flexible electronic devices. Fiber batteries, with their excellent flexibility and safety, have become an ideal power source. As a flexible energy storage device, the core function of a fiber battery lies in combining energy storage units with fiber materials to achieve electrochemical energy storage and release while maintaining the flexibility, weavability, and lightweight properties of fibers. These batteries can be directly integrated into textiles, wearable devices, smart fabrics, and flexible electronic systems, providing self-powered solutions for distributed sensors, microelectronic devices, and medical monitoring modules, thereby overcoming the limitations of traditional rigid batteries in terms of flexibility, breathability, and integration compatibility.

[0003] The current main approach to fiber batteries involves first preparing positive and negative electrode fibers, which carry the active material, using processes such as wet spinning, coating, or deposition. These two fibers already possess the complete functions of current collection and energy storage. Then, a strip-shaped or tubular separator (such as a polymer porous separator) is wrapped around one of the electrode fibers, or the separator is placed directly between two parallel electrode fibers. Finally, the positive electrode, separator, and negative electrode are tightly bonded together through physical twisting (forming a double-strand helical structure) or winding to form a complete fiber battery unit. For example, the azo polymer fiber electrode and its application in a fiber battery disclosed in patent application CN120015830A involve winding the positive electrode fiber around the outside of a polymer fiber negative electrode wrapped with a polymer separator to assemble the fiber battery. However, this winding / twisting assembly method limits the capacity improvement of fiber batteries; therefore, developing a method to improve the capacity of fiber batteries is of significant value. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a fiber battery with a honeycomb-shaped electrode arrangement and its preparation method. The fiber battery prepared by the method described in this invention can maintain good flexibility while having a higher battery capacity, and can also achieve continuous production, improving production efficiency and reducing manufacturing costs.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a method for preparing a fiber battery with honeycomb-shaped electrode arrangement, wherein the preparation method is as follows: The fiber electrodes are arranged in a multi-layered manner, with the fiber positive electrode layer and the fiber negative electrode layer arranged alternately, and a separator is arranged between the fiber positive electrode layer and the fiber negative electrode layer; the fiber positive electrode layer is composed of multiple parallel fiber positive electrodes extending along the axial direction of the fiber battery, and the fiber negative electrode layer is composed of multiple parallel fiber negative electrodes extending along the axial direction of the fiber battery. After the fiber positive electrode, fiber negative electrode and separator are arranged in at least one shaping mold, they are then subjected to shrinkage treatment in at least one diameter changing mold, and then encapsulated in a packaging tube, injected with electrolyte and encapsulated to obtain the fiber battery. The shaping mold and the diameter-changing mold are provided with a number of electrode through holes for the fiber electrodes to pass through, and the shaping mold and the diameter-changing mold are provided with a number of long slits for the diaphragm to pass through.

[0006] Furthermore, the fiber positive and fiber negative electrodes between adjacent fiber positive and fiber negative electrode layers are arranged in a spatially complementary manner.

[0007] Furthermore, both the positive and negative fiber electrodes enter the electrode through-hole of the shaping mold through a winding roller. When the positive and negative fiber electrodes enter the electrode through-hole of the shaping mold, the angle between the positive and negative fiber electrodes and the central axis of the corresponding electrode through-hole is -45° to 45°.

[0008] Furthermore, the two sides of the electrode through hole are the fiber electrode inlet end face and the fiber electrode outlet end face, respectively, and the cross-section of the electrode through hole is arranged in a converging shape from the fiber electrode inlet end face to the fiber electrode outlet end face.

[0009] Furthermore, in the direction from the fiber electrode inlet end face to the fiber electrode outlet end face, the angle between the electrode through hole in the shaping mold and the central axis of the shaping mold is -30° to 30°, and the angle between the electrode through hole in the variable diameter mold and the central axis of the shaping mold is -30° to 30°.

[0010] Furthermore, the ratio of the diameter of the electrode through hole on the fiber electrode inlet face of the initial stage shaping mold to the diameter of the fiber electrode is (4-5):1; the ratio of the diameter of the electrode through hole on the fiber electrode outlet face of the final stage variable diameter mold to the diameter of the fiber electrode is (1.1-1.3):1.

[0011] Furthermore, both ends of the long slit of the variable diameter mold are provided with bending grooves that allow the edge of the diaphragm to wrap around the fiber electrode, and the bending radius of the bending groove is 1.5-3 times the diameter of the fiber electrode.

[0012] Furthermore, in the shaping mold, the fiber electrode inlet face of the electrode through hole is provided with a rounded corner structure with a rounded corner radius of 0.8-1.2mm; the fiber electrode outlet face of the electrode through hole is provided with a rounded corner structure with a rounded corner radius of 0.3-0.6mm. In the variable diameter mold, both ends of the electrode through hole are provided with rounded corner structures, and the radius of the rounded corners is 0.3-0.6mm.

[0013] Furthermore, the preparation method includes a primary shaping mold and a tertiary diameter-changing mold; At the fiber electrode entry end face of the shaping mold, the distance between the centers of each electrode through hole is 6-12 times the diameter of the fiber electrode. At the fiber electrode entry end face of the first-stage variable diameter mold, the distance between the centers of each electrode through hole is 3-4 times the diameter of the fiber electrode. At the fiber electrode entry end face of the second-stage variable diameter mold, the distance between the centers of each electrode through hole is 1.6-2 times the diameter of the fiber electrode. At the entry end face of the fiber electrode of the variable diameter mold in the third stage, the distance between the centers of the through holes of each electrode is 1.1-1.5 times the diameter of the fiber electrode.

[0014] The present invention also discloses a fiber battery with a honeycomb-shaped electrode arrangement, wherein the fiber battery is prepared by the preparation method described in the present invention.

[0015] The beneficial effects of this invention are: Compared to conventional fiber batteries with twisted positive and negative electrodes, the fiber battery of this invention reduces the electrode separator wrapping process. Furthermore, using a single separator layer to separate multiple electrodes reduces separator usage by at least 33%. Arranging all electrodes side-by-side eliminates the need for twisting, preventing damage during the twisting process and improving the internal space utilization of the fiber electrodes. This results in a capacity increase of at least 53% for fiber batteries of the same diameter. Reducing both the twisting and separator wrapping processes enables continuous mass production of some fiber battery processes, improving overall production efficiency. The resulting fiber battery does not catch fire or explode under tests such as needle penetration, compression, heavy object impact, and thermal abuse, maintaining its safety and flexibility.

[0016] In the fiber battery preparation method of the present invention, by rationally designing the shape mold and the diameter-changing mold structure, continuous production of high-capacity fiber batteries can be achieved, while avoiding damage to the coating on the surface of the fiber electrode during the fiber battery preparation process, which would affect the application effect of the fiber battery. In addition, it ensures that the separator can completely block the fiber positive electrode and the fiber negative electrode, thus avoiding short circuit problems in the battery. Attached Figure Description

[0017] Figure 1 This is a flowchart of the equipment used in the fabrication process of the fiber battery described in this invention. Figure 2 This is a schematic diagram of the structure of the molding die; Figure 3 This is a schematic diagram of the structure of a variable diameter mold; Figure 4 A schematic diagram of the fiber electrode entering the end face of the shaping mold; Figure 5 A schematic diagram of the fiber electrode entering the end face of a variable diameter mold; Figure 6 This is a cross-sectional view of the electrode through-hole in the molding die; Figure 7 This is a schematic diagram of the cross-sectional structure of the fiber battery in Example 1; In the diagram, 1. Positive electrode fiber winding roller; 2. Separator winding roller; 3. Negative electrode fiber winding roller; 4. Shaping mold; 5. Variable diameter mold; 6. Packaging device; 7. Battery winding roller; 8. Fiber electrode inlet face; 9. Fiber electrode outlet face; 10. Fiber positive electrode; 11. Fiber negative electrode; 12. Separator; 13. Electrolyte; 14. Packaging tube; 15. Electrode through hole; 16. Long slot; 17. Bending groove. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in detail below. The present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used is for describing particular embodiments only and is not intended to limit the invention.

[0020] like Figure 1 As shown, a method for preparing a fiber battery with honeycomb-shaped electrode arrangement is described, wherein the preparation method is as follows: The fiber electrodes are arranged in a multi-layered manner, with the fiber positive electrode layer and the fiber negative electrode layer arranged alternately, and a separator 12 is arranged between the fiber positive electrode layer and the fiber negative electrode layer; the fiber positive electrode layer is composed of multiple parallel fiber positive electrodes 10 extending along the axial direction of the fiber battery, and the fiber negative electrode layer is composed of multiple parallel fiber negative electrodes 11 extending along the axial direction of the fiber battery. After the fiber positive electrode 10, fiber negative electrode 11 and separator 12 are arranged in at least one shaping mold 4, they are then subjected to shrinkage treatment in at least one diameter changing mold 5. After shrinkage treatment, the fiber electrode is put into the encapsulation tube 14 using a conventional encapsulation device 6. After the electrode tab is connected, electrolyte 13 is injected and encapsulated. After formation, the fiber battery is obtained. The shaping mold 4 and the variable diameter mold 5 are provided with a plurality of electrode through holes 15 for the fiber electrodes to pass through, and the shaping mold 4 and the variable diameter mold 5 are provided with a plurality of elongated slits 16 for the diaphragm 12 to pass through.

[0021] Specifically, the fiber positive electrode 10 and fiber negative electrode 11 between adjacent fiber positive electrode layers and fiber negative electrode layers are arranged in a spatially complementary manner to form a fiber battery similar to an electrode arrangement in a honeycomb pattern.

[0022] More specifically, such as Figure 7 As shown, the fiber battery consists of a fiber positive electrode layer, a fiber negative electrode layer, a fiber positive electrode layer, a fiber negative electrode layer, and a fiber positive electrode layer arranged sequentially from top to bottom, with a separator 12 between the fiber positive electrode layer and the fiber negative electrode layer. Each fiber positive electrode layer consists of several fiber positive electrodes 10 arranged in parallel, and each fiber negative electrode layer consists of several fiber negative electrodes 11 arranged in parallel. Each fiber positive electrode 10 is located between two fiber negative electrodes 11 in the upper fiber negative electrode layer and also between two fiber negative electrodes 11 in the lower fiber negative electrode layer; each fiber negative electrode 11 is located between two fiber positive electrodes 10 in the upper fiber positive electrode layer and also between two fiber positive electrodes 10 in the lower fiber positive electrode layer. That is, the fiber positive electrodes 10 and fiber negative electrodes 11 are arranged in a spatially complementary manner.

[0023] More specifically, in actual production applications, it is necessary to ensure that the capacities of all fiber positive electrodes 10 and all fiber negative electrodes 11 in the fiber battery are mutually matched, and the number of fiber positive electrodes 10 and fiber negative electrodes 11 is set according to the capacity matching. In the embodiments of the present invention, the fiber positive electrodes 10 and fiber negative electrodes 11 used are of the same thickness, but the capacity of each fiber positive electrode 10 is slightly lower than that of each fiber negative electrode. Therefore, in the overall fiber battery product, the number of fiber positive electrodes 10 is greater than the number of fiber negative electrodes 11, but this does not constitute a limitation on the technical solution of the present invention.

[0024] More specifically, in this embodiment of the invention, the fiber electrodes are arranged in n layers, and the arrangement is as follows: Fiber positive electrode layer: (n+1) / 2 fiber positive electrodes 10; Fiber negative electrode layer: (n+1) / 2+1 fiber negative electrodes 11; Fiber positive electrode layer: (n+1) / 2+2 fiber positive electrode 10; ... Fiber positive electrode layer: n fiber positive electrodes 10; ... Fiber positive electrode layer: (n+1) / 2+2 fiber positive electrode 10; Fiber negative electrode layer: (n+1) / 2+1 fiber negative electrodes 11; Fiber positive electrode layer: (n+1) / 2 fiber positive electrodes 10; n is an odd number and greater than 1.

[0025] Specifically, the fiber positive electrode 10 and the fiber negative electrode 11 both enter the electrode through hole 15 of the shaping mold 4 through the winding roller. When the fiber positive electrode 10 and the fiber negative electrode 11 enter the electrode through hole 15 of the shaping mold 4, the angle between the fiber positive electrode 10 and the fiber negative electrode 11 and the central axis of the corresponding electrode through hole 15 is -45° to 45°.

[0026] Specifically, the positive electrode 10 is conveyed to the shaping mold 4 via the positive electrode fiber winding roller 1, the negative electrode 11 is conveyed to the shaping mold 4 via the negative electrode fiber winding roller 3, and the separator 12 is conveyed to the shaping mold 4 via the separator winding roller 2. During the fiber battery manufacturing process, the angle between the positive and negative electrodes 10 and the corresponding electrode through-hole 15 and their central axis is controlled to be -45° to 45°. In actual production, the angle between the positive and negative electrodes 10 and the electrode through-hole 15 can be controlled by gradually adding guide rollers, thus preventing damage to the fiber electrodes during fiber battery production and affecting the performance of the fiber battery.

[0027] Specifically, such as Figures 2-5 As shown, the two sides of the electrode through hole 15 are the fiber electrode inlet end face 8 and the fiber electrode outlet end face 9, respectively. The cross-section of the electrode through hole 15 is arranged in a converging shape from the fiber electrode inlet end face 8 to the fiber electrode outlet end face 9.

[0028] Specifically, from the fiber electrode inlet end face 8 to the fiber electrode outlet end face 9, the angle between the electrode through hole 15 in the shaping mold 4 and the central axis of the shaping mold 4 is -30° to 30° (i.e., ...). Figure 2 The angle α between L0 and L1 is -30° to 30°. The angle between the electrode through hole 15 in the variable diameter mold 5 and the central axis of the shaping mold 4 is -30° to 30°.

[0029] Specifically, the ratio of the diameter of the electrode through hole 15 on the fiber electrode inlet end face 8 of the initial stage shaping mold 4 to the diameter of the fiber electrode is (4-5):1; the ratio of the diameter of the electrode through hole 15 on the fiber electrode outlet end face 9 of the final stage variable diameter mold 5 to the diameter of the fiber electrode is (1.1-1.3):1.

[0030] Specifically, such as Figure 5 As shown, both ends of the long slit 16 of the variable diameter mold 5 are provided with bending grooves 17 that allow the edge of the diaphragm 12 to wrap around the fiber electrode. The bending radius of the bending groove 17 is 1.5-3 times the diameter of the fiber electrode.

[0031] Specifically, such as Figure 6As shown, in the shaping mold 4, the fiber electrode inlet end face 8 of the electrode through hole 15 is provided with a rounded corner structure, and the rounded corner radius (R1) is 0.8-1.2mm; the fiber electrode outlet end face 9 of the electrode through hole 15 is provided with a rounded corner structure, and the rounded corner radius (R2) is 0.3-0.6mm. In the variable diameter mold 5, both ends of the electrode through hole 15 are provided with rounded corner structures, and the radius of the rounded corners is 0.3-0.6mm. The rounded corner structure of the electrode through hole 15 in the shaping mold 4 and the variable diameter mold 5 can effectively avoid damage to the coating of the fiber electrode during the production process, and at the same time facilitate the smooth progress of the production process.

[0032] Specifically, the preparation method includes a primary shaping mold 4 and a tertiary diameter changing mold 5; At the fiber electrode entry end face 8 of the shaping mold 5, the distance between the centers of each electrode through hole 15 is 6-12 times the diameter of the fiber electrode. At the fiber electrode entry end face 8 of the first-stage variable diameter mold 5, the distance between the centers of each electrode through hole 15 is 3-4 times the diameter of the fiber electrode. At the fiber electrode entry end face 8 of the second-stage variable diameter mold 5, the distance between the centers of each electrode through hole 15 is 1.6-2 times the diameter of the fiber electrode. At the fiber electrode entry end face 8 of the third-stage variable diameter mold 5, the distance between the centers of each electrode through hole 15 is 1.1-1.5 times the diameter of the fiber electrode.

[0033] The multi-stage reduction setting of the multi-stage variable diameter mold 5 is more conducive to protecting the fiber electrode, resulting in a high-performance fiber battery.

[0034] The fiber positive electrode 10 used in this embodiment of the invention is prepared by coating a positive electrode slurry onto an aluminum wire with a diameter of 0.25 mm to obtain the fiber positive electrode 10. The positive electrode slurry consists of lithium cobalt oxide, a conductive agent, and a binder, wherein the binder is polyvinylidene fluoride, and the mass ratio of lithium cobalt oxide, conductive agent, and binder is (90-95):(2-5):(3-5). The electrode diameter is 0.3-2 mm. The fiber positive electrode 10 used in this embodiment of the invention has a diameter of 0.6 mm.

[0035] The fiber negative electrode 11 used in this embodiment of the invention is prepared by coating a negative electrode slurry onto a copper wire with a diameter of 0.25 mm to obtain the fiber negative electrode 11. The negative electrode slurry consists of graphite, a conductive agent, and a binder. The binder is sodium carboxymethyl cellulose and styrene-butadiene rubber. The mass ratio of graphite, conductive agent, and binder is (95.5-97):(1-2):(2-2.5), and the mass ratio of sodium carboxymethyl cellulose and styrene-butadiene rubber is (0.8-1):(1.2-1.5). The electrode diameter is 0.3-2 mm. The diameter of the fiber negative electrode 11 used in this embodiment of the invention is 0.6 mm.

[0036] The diaphragm 12 used in this embodiment of the invention is a Celgard2500 single-layer PP film.

[0037] The electrolyte 13 used in this embodiment of the invention is LB-303 electrolyte.

[0038] The encapsulation tube used in this embodiment of the invention is polychlorotrifluoroethylene, and the thickness of the encapsulation tube is 0.2-2mm.

[0039] In this embodiment of the invention, the conductive agent is conductive carbon black (TIMCAL; model: MA-EN-CO-0005), the graphite is commercial graphite (Canrd; model: MA-EN-AN-0017), the polyvinylidene fluoride is purchased from Canrd, model PVDF 900, the styrene-butadiene rubber is purchased from Canrd, model TRD, and the electrolyte is purchased from Zhangjiagang Guotai Huarong Chemical New Materials Co., Ltd., model LB-303.

[0040] Example 1 The preparation method of a fiber battery with honeycomb-shaped electrode arrangement is as follows: (1) Arrange 3 fiber positive electrodes in parallel, add a layer of separator, continue to arrange 4 fiber negative electrodes in parallel, add a layer of separator, continue to arrange 5 fiber positive electrodes in parallel, add a layer of separator, continue to arrange 4 fiber negative electrodes in parallel, add a layer of separator, continue to arrange 3 fiber positive electrodes in parallel.

[0041] (2) Place the electrode assembly completed in step (1) into the encapsulation tube.

[0042] (3) Inject electrolyte into the encapsulation tube from step (2) and encapsulate it.

[0043] (4) The fiber battery from step (3) is processed to obtain the desired fiber battery, such as... Figure 7 As shown.

[0044] In this embodiment, a primary shaping mold and a tertiary diameter changing mold are provided; At the fiber electrode entry end face of the shaping mold, the distance between the centers of each electrode through hole is 10 times the diameter of the fiber electrode. At the entry end face of the fiber electrode of the first-stage variable diameter mold, the distance between the centers of the through holes of each electrode is 4 times the diameter of the fiber electrode; the bending radius of the bending groove is 2 times the diameter of the fiber electrode.

[0045] At the entry end face of the fiber electrode of the variable diameter mold in the second stage, the distance between the centers of the through holes of each electrode is twice the diameter of the fiber electrode; the bending radius of the bending groove is twice the diameter of the fiber electrode.

[0046] In the third stage of the variable diameter mold, the distance between the centers of the electrode through holes at the fiber electrode entry end face is 1.5 times the diameter of the fiber electrode. The bending radius of the bending groove is twice the diameter of the fiber electrode. In the last stage of the variable diameter mold, the ratio of the diameter of the electrode through hole to the diameter of the fiber electrode on the fiber electrode output end face is 1.1:1.

[0047] The fiber electrode inlet face of the electrode through hole is provided with a rounded corner structure with a rounded corner radius (R1) of 1.0 mm; the fiber electrode outlet face of the electrode through hole is provided with a rounded corner structure with a rounded corner radius (R2) of 0.5 mm; in the variable diameter mold, both ends of the electrode through hole 5 are provided with rounded corner structures with a rounded corner radius of 0.5 mm.

[0048] The angle between the positive and negative fiber electrodes and the central axis of the corresponding electrode through holes is -35° to 35°; the angle between the electrode through holes in the shaping mold and the central axis of the shaping mold is -20° to 20°; the angle between the electrode through holes in the variable diameter mold and the central axis of the shaping mold is -20° to 20°.

[0049] Example 2 The preparation method of a fiber battery with honeycomb-shaped electrode arrangement is as follows: (1) Place two fiber positive electrodes side by side, add a membrane, continue to place three fiber negative electrodes side by side, add a membrane, and continue to place two fiber positive electrodes side by side.

[0050] (2) Place the electrode assembly completed in step (1) into the encapsulation tube.

[0051] (3) Inject electrolyte into the encapsulation tube from step (2) and encapsulate it.

[0052] (4) The fiber battery from step (3) is processed to obtain the desired fiber battery.

[0053] In this embodiment, a primary shaping mold and a tertiary diameter changing mold are provided; At the end face of the fiber electrode of the shaping mold, the distance between the centers of the through holes of each electrode is 6 times the diameter of the fiber electrode.

[0054] At the entry end face of the fiber electrode of the first-stage variable diameter mold, the distance between the centers of the through holes of each electrode is 3 times the diameter of the fiber electrode; the bending radius of the bending groove is 2 times the diameter of the fiber electrode.

[0055] At the entry end face of the fiber electrode of the variable diameter mold in the second stage, the distance between the centers of the through holes of each electrode is 1.6 times the diameter of the fiber electrode; the bending radius of the bending groove is 2 times the diameter of the fiber electrode.

[0056] In the third stage of the variable diameter mold, at the fiber electrode entry end face, the distance between the centers of each electrode through hole is 1.5 times the fiber electrode diameter. The bending radius of the bending groove is twice the fiber electrode diameter. In the last stage of the variable diameter mold, the ratio of the electrode through hole diameter to the fiber electrode diameter on the fiber electrode output end face is 1.3:1.

[0057] The fiber electrode inlet face of the electrode through hole is provided with a rounded corner structure with a rounded corner radius (R1) of 1.0 mm; the fiber electrode outlet face of the electrode through hole is provided with a rounded corner structure with a rounded corner radius (R2) of 0.5 mm; in the variable diameter mold, both ends of the electrode through hole 5 are provided with rounded corner structures with a rounded corner radius of 0.5 mm.

[0058] The angle between the positive and negative fiber electrodes and the central axis of the corresponding electrode through holes is -20° to 20°; the angle between the electrode through holes in the shaping mold and the central axis of the shaping mold is -15° to 15°; and the angle between the electrode through holes in the variable diameter mold and the central axis of the shaping mold is -15° to 15°.

[0059] Comparative Example 1 The preparation method of a fiber battery with twisted electrodes is as follows: (1) Wrap the two negative electrode fibers around the diaphragm and twist them with the two positive electrode fibers respectively.

[0060] (2) Place the electrode assembly completed in step (1) into the encapsulation tube.

[0061] (3) Inject electrolyte into the encapsulation tube from step (2) and encapsulate it.

[0062] (4) The fiber battery from step (3) is processed to obtain the desired fiber battery.

[0063] Comparative Example 2 The fiber battery was prepared using the same method as in Example 1, except that the ends of the long slit of the variable diameter mold in Comparative Example 2 were not provided with bending grooves.

[0064] Comparative Example 3 The fiber battery was prepared using the same method as in Example 1, except that: only a single-stage variable-diameter mold was used in Comparative Example 3. At the fiber electrode entry face of the variable-diameter mold, the distance between the centers of each electrode through-hole was four times the diameter of the fiber electrode; the ratio of the diameter of the electrode through-hole on the fiber electrode output face of the variable-diameter mold to the diameter of the fiber electrode was 1.1:1. The bending radius of the bending groove was twice the diameter of the fiber electrode, and the angle between the electrode through-hole in the variable-diameter mold and the central axis of the shaping mold was -35° to 35° (i.e., the inclination angle of the electrode through-hole in the variable-diameter mold was greater than the range defined in this invention).

[0065] Comparative Example 4 The fiber battery was prepared using the same method as in Example 1, except that the angle between the electrode through hole in the shaping mold and the central axis of the shaping mold in Comparative Example 4 was -40° to 40° (i.e., the tilt angle of the electrode through hole in the shaping mold was greater than the range defined in this invention).

[0066] Comparative Example 5 The fiber battery was prepared using the same method as in Example 1, except that the ratio of the diameter of the electrode through hole on the output end face of the fiber electrode of the last stage of the variable diameter mold to the diameter of the fiber electrode is 1.5:1 (the diameter of the electrode through hole on the output end face of the fiber electrode of the last stage of the variable diameter mold is larger than the size ratio specified in this invention).

[0067] Comparative Example 6 The fiber battery was prepared using the same method as in Example 1, except that in the shaping mold of Comparative Example 6, the fiber electrode entry end face of the electrode through hole is provided with a rounded corner structure, and the rounded corner radius (R1) is 0.5 mm (lower than the rounded corner radius size defined in this invention).

[0068] The fiber batteries prepared in the above embodiments and comparative examples were subjected to performance tests, and the specific test results are shown in Table 1 below. The flexibility of the fiber battery was verified by testing the minimum bending radius of the fiber electrode. The test method for the minimum bending radius was as follows: the fiber battery was bent onto an arc mold of a specified radius, and the surface of the fiber battery was checked for cracking and whether the fiber battery was functioning normally. The radius of the arc mold at which cracking occurred or the fiber battery failed to function normally (short circuit or inability to charge / discharge normally) was measured, which is the minimum bending radius of the fiber battery.

[0069] Table 1 Performance Test Results

[0070] As can be seen from the data in the table above, the fiber batteries prepared using the method described in this invention in Examples 1 and 2 possess both high capacity and flexibility. Compared to the electrode-twisted fiber battery of Comparative Example 1, with similar dimensions, the fiber battery of this invention maintains better flexibility while having a higher battery capacity, and the preparation method is simpler, effectively improving production efficiency.

[0071] The comparison between the results of Comparative Example 2 and Example 1 shows that if the ends of the long slit of the variable diameter mold are not provided with bending grooves, the positive and negative electrodes in the fiber battery are prone to contact problems during the encapsulation process, which will eventually lead to a short circuit.

[0072] The comparison between the results of Comparative Example 3 and Example 1 shows that if the tilt angle of the electrode through hole in the variable diameter mold is greater than the range defined by the present invention, the coating on the fiber electrode is easily worn during the fiber battery preparation process, which ultimately affects the efficiency and capacity of the fiber battery. Therefore, the variable diameter mold structure size defined by the present invention is more conducive to obtaining a fiber battery with excellent comprehensive performance.

[0073] The comparison between the results of Comparative Example 4 and Example 1 shows that if the tilt angle of the electrode through hole in the shaping mold is greater than the range defined by the present invention, the coating on the fiber electrode is easily worn during the fiber battery preparation process, which ultimately affects the efficiency and capacity of the fiber battery. Therefore, the shaping mold structure size defined by the present invention is more conducive to obtaining a fiber battery with excellent comprehensive performance.

[0074] The comparison between Comparative Example 5 and Example 1 shows that if the diameter of the electrode through hole on the output end face of the fiber electrode of the last stage variable diameter mold is larger than the size ratio specified in this invention, the neatness of the arrangement of the fiber positive electrode, fiber negative electrode and separator in the fiber battery is easily affected during the packaging process, resulting in a decrease in the capacity and efficiency of the fiber battery, and the probability of short circuit of the fiber battery is relatively high in the actual production process.

[0075] A comparison of the results of Comparative Example 6 and Example 1 shows that if the radius of the fillet of the electrode through-hole is smaller than the radius of the fillet specified in this invention, the coating on the fiber electrode is easily worn during the fiber battery preparation process, which ultimately affects the efficiency and capacity of the fiber battery.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A method for preparing a fiber battery with honeycomb-shaped electrode arrangement, characterized in that, The preparation method is as follows: The fiber electrodes are arranged in a multi-layered manner, with the fiber positive electrode layer and the fiber negative electrode layer arranged alternately, and a separator is arranged between the fiber positive electrode layer and the fiber negative electrode layer; the fiber positive electrode layer is composed of multiple parallel fiber positive electrodes extending along the axial direction of the fiber battery, and the fiber negative electrode layer is composed of multiple parallel fiber negative electrodes extending along the axial direction of the fiber battery. After the fiber positive electrode, fiber negative electrode and separator are arranged in at least one shaping mold, they are then subjected to shrinkage treatment in at least one diameter changing mold, and then encapsulated in a packaging tube, injected with electrolyte and encapsulated to obtain the fiber battery. The shaping mold and the diameter-changing mold are provided with a number of electrode through holes for the fiber electrodes to pass through, and the shaping mold and the diameter-changing mold are provided with a number of long slits for the diaphragm to pass through.

2. The method for preparing a fiber battery with honeycomb-shaped electrode arrangement according to claim 1, characterized in that, The fiber positive and fiber negative electrodes between adjacent fiber positive and fiber negative electrode layers are arranged in a spatially complementary manner.

3. The method for preparing a fiber battery with honeycomb-shaped electrode arrangement according to claim 1, characterized in that, Both the positive and negative fiber electrodes enter the electrode through-hole of the shaping mold through a winding roller. When the positive and negative fiber electrodes enter the electrode through-hole of the shaping mold, the angle between the positive and negative fiber electrodes and the central axis of the corresponding electrode through-hole is -45° to 45°.

4. The method for preparing a fiber battery with honeycomb-shaped electrode arrangement according to claim 3, characterized in that, The two sides of the electrode through hole are the fiber electrode inlet face and the fiber electrode outlet face, respectively, and the cross-section of the electrode through hole is arranged in a converging shape from the fiber electrode inlet face to the fiber electrode outlet face.

5. The method for preparing a fiber battery with honeycomb-shaped electrode arrangement according to claim 4, characterized in that, From the fiber electrode inlet end face to the fiber electrode outlet end face, the angle between the electrode through hole in the shaping mold and the central axis of the shaping mold is -30° to 30°, and the angle between the electrode through hole in the variable diameter mold and the central axis of the shaping mold is -30° to 30°.

6. The method for preparing a fiber battery with honeycomb-shaped electrode arrangement according to claim 1, characterized in that, The ratio of the diameter of the electrode through hole on the fiber electrode inlet face of the initial stage shaping mold to the diameter of the fiber electrode is (4-5):1; the ratio of the diameter of the electrode through hole on the fiber electrode outlet face of the final stage variable diameter mold to the diameter of the fiber electrode is (1.1-1.3):

1.

7. The method for preparing a fiber battery with honeycomb-shaped electrode arrangement according to claim 1, characterized in that, Both ends of the long slit of the variable diameter mold are provided with bending grooves that allow the edge of the diaphragm to wrap around the fiber electrode. The bending radius of the bending groove is 1.5-3 times the diameter of the fiber electrode.

8. The method for preparing a fiber battery with honeycomb-shaped electrode arrangement according to claim 1, characterized in that, In the shaping mold, the fiber electrode inlet face of the electrode through hole is provided with a rounded corner structure with a rounded corner radius of 0.8-1.2mm; the fiber electrode outlet face of the electrode through hole is provided with a rounded corner structure with a rounded corner radius of 0.3-0.6mm. In the variable diameter mold, both ends of the electrode through hole are provided with rounded corner structures, and the radius of the rounded corners is 0.3-0.6mm.

9. The method for preparing a fiber battery with honeycomb-shaped electrode arrangement according to claim 1, characterized in that, The preparation method includes a primary shaping mold and a tertiary diameter changing mold; At the fiber electrode entry end face of the shaping mold, the distance between the centers of each electrode through hole is 6-12 times the diameter of the fiber electrode. At the fiber electrode entry end face of the first-stage variable diameter mold, the distance between the centers of each electrode through hole is 3-4 times the diameter of the fiber electrode. At the fiber electrode entry end face of the second-stage variable diameter mold, the distance between the centers of each electrode through hole is 1.6-2 times the diameter of the fiber electrode. At the entry end face of the fiber electrode of the variable diameter mold in the third stage, the distance between the centers of the through holes of each electrode is 1.1-1.5 times the diameter of the fiber electrode.

10. A fiber battery with honeycomb-shaped electrode arrangement, characterized in that, The fiber battery is prepared by any one of the preparation methods described in claims 1-9.

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