Carbon fiber corrugated sandwich panel for battery box protection, its preparation mold and preparation method

Abstract

The present invention relates to the technical field of battery protection, in particular to a carbon fiber corrugated sandwich panel for battery box protection, its preparation mold and preparation method. The carbon fiber corrugated sandwich panel includes an outer panel, an inner panel and a Y-shaped core; the preparation mold includes an outer pressing plate, an inner pressing plate, a core surface mold, a core connection mold, a core upper end mold, a core side end mold, an outer positioning member and an inner positioning member; the preparation method includes the following steps: obtaining a plurality of carbon fiber prepregs and cleaning the mold; laying a carbon fiber prepreg layer on the mold surface; assembling and positioning the mold; laying the inner panel and the outer panel; clamping the mold; hot pressing and forming; demolding; obtaining an integral carbon fiber corrugated sandwich panel. The battery box prepared by the present invention has sufficient protection at the corners, and the mechanical properties of the surface-core interface of the corrugated sandwich panel are strong. The preparation mold and preparation method can be used for batch preparation of carbon fiber corrugated sandwich panels.

Description

Technical Field

[0001] The present invention relates to the technical field of battery protection, in particular to a carbon fiber corrugated sandwich panel for battery box protection, a preparation mold thereof, and a preparation method thereof. Background Art

[0002] The popularization of new energy vehicles is an important way to effectively alleviate the current global energy and environmental problems and promote the sustainable development of the automotive industry; new energy vehicles with high energy utilization rate and no pollution to the environment are increasingly becoming the future development direction of the automotive industry. As the core component of new energy vehicles, the safety of power batteries will directly affect the overall vehicle performance and driving safety of electric vehicles. To avoid battery damage and ensure good battery performance, it is necessary to ensure the normal working state inside the battery box, and the stability requirements for the battery box structure are very high.

[0003] When designing the structure of the battery box, factors such as vibration resistance strength, impact resistance performance, collision safety performance, sealing performance, anti-corrosion performance, anti-stone impact performance, lightweight, and low cost need to be considered. Most traditional power battery boxes are made of metal materials such as steel or aluminum alloy, and the stiffness, crashworthiness, and energy absorption of their structures will directly affect the safety of new energy vehicles. Carbon fiber composite materials not only have high specific stiffness and specific strength, but also have a series of characteristics such as excellent fatigue resistance, impact energy absorption characteristics, good structural dimension stability, and good designability. Therefore, by using carbon fiber composite materials and through reasonable structural design, it can play a good protective role for the battery box, and further play a good protective role for the battery.

[0004] The corrugated sandwich structure is a structure that can simultaneously meet excellent mechanical properties such as light weight and strong function in engineering indicators. The corrugated sandwich panel is a material composed of two upper and lower high-strength and high-modulus thin plates and a relatively thick corrugated core in the middle. Most of the existing corrugated sandwich panels use metal materials, and the corrugated sandwich panel prepared by using composite materials has higher specific strength and specific stiffness compared with the sandwich panel prepared by traditional metal materials, and has stronger designability.

[0005] The "Y"-type composite material corrugated sandwich panel is a new type of corrugated sandwich structure. Using the previous preparation process of bonding the core and the panel with glue cannot enhance the surface-core interface performance at the connection between the core and the panel. When the corrugated sandwich panel is stressed as a whole, failure forms such as surface-core debonding are likely to occur, reducing the mechanical properties of the "Y"-type composite material corrugated sandwich structure; using the corrugated sandwich panel can play a protective role for components vulnerable to impact such as battery boxes, etc. The corrugated sandwich panel prepared by the previous preparation process can only play a protective role for the external plane part and cannot play a good protective role for the corners. Summary of the Invention

[0006] The object of the present invention is to provide a carbon fiber corrugated sandwich panel for battery box protection, its preparation mold and preparation method, to overcome the problems of insufficient protection at the corners of the battery box and insufficient mechanical properties at the interface between the surface and the core of the corrugated sandwich panel in the aforementioned prior art. The preparation mold and preparation method can be used for batch preparation of an integral carbon fiber corrugated sandwich panel for battery box protection.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0008] A carbon fiber corrugated sandwich panel includes an outer panel, an inner panel and a Y-shaped core. The Y-shaped core is arranged between the outer panel and the inner panel. The Y-shaped core includes inclined plates, platform plates and connecting plates. There are two symmetrically arranged inclined plates. The mutually remote ends of the inclined plates are fixedly connected to the outer panel. The mutually close sections of the inclined plates are connected by platform plates. One end of the platform plate is connected to one end of the connecting plate, and the other end of the connecting plate is connected to the inner panel.

[0009] Further, the main body of the outer panel is rectangular, and the corners of the main body of the outer panel are arc-shaped; the whole of the inner panel is rectangular.

[0010] Further, in the main body part of the outer panel, the included angle between the inclined plate and the outer panel is 35 - 60°, preferably 45°. The platform plate is parallel to the outer panel, and the connecting plate is perpendicular to the inner panel; in the arc-shaped part of the outer panel, the inclined plate is perpendicular to both ends of the arc section, and the connecting plate is connected to the chamfered edge of the inner panel.

[0011] A preparation mold for a carbon fiber corrugated sandwich panel includes an outer pressing plate, an inner pressing plate, a core curved surface mold, a core connecting mold, a core upper end mold, a core side end mold, an outer positioning member and an inner positioning member, wherein:

[0012] The main body of the outer pressing plate is rectangular, and the corners of the main body of the outer pressing plate are arc-shaped; the whole of the inner pressing plate is rectangular;

[0013] The core curved surface mold, the core connecting mold, the core upper end mold and the core side end mold are all arranged between the outer pressing plate and the inner pressing plate. Among them: the cross-section of the core curved surface mold is quasi-sector-shaped; the cross-section of the core upper end mold is isosceles trapezoidal; the cross-section of the core side end mold is divided into two parts. The cross-section shape of the upper half part is trapezoidal, and the cross-section shape of the lower half part is rectangular; the cross-section of the core connecting mold is an irregular nonagon;

[0014] The core curved surface mold is arranged on the arc section of the outer pressing plate. The core connecting molds are arranged on both sides of the core curved surface mold. The gap formed between the core curved surface mold and the core connecting mold matches the shape of the Y-shaped core;

[0015] A plurality of core side-end molds are arranged at intervals between the cores of two adjacent arc segments of the outer pressing plate. A core upper mold is arranged between two adjacent core side-end molds, and a core upper mold is also arranged between two adjacent core connecting molds and core side-end molds; the shape of the gap formed between the core upper mold and the two core side-end molds on its two sides is matched with the shape of the Y-shaped core; the shape formed between the core upper mold and the core side-end molds and core connecting molds on its two sides is also matched with the shape of the Y-shaped core;

[0016] There is a gap between the core curved surface mold, the core connecting mold, the core upper mold, the core side-end mold and the inner side surface of the outer pressing plate, and the shape of this gap is matched with the shape of the outer side panel. The end faces of the core curved surface mold, the core connecting mold, the core upper mold and the core side-end mold close to the outer pressing plate are all provided with first clamping grooves corresponding in position, and the outer side positioning members are respectively clamped in the corresponding first clamping grooves, and the outer pressing plate is clamped between the outer side positioning members at both ends;

[0017] There is a gap between the core connecting mold and the core side-end mold and the outer side surface of the inner pressing plate, and the shape of this gap is matched with the shape of the inner side panel. The end faces of the core connecting mold and the core side-end mold close to the inner pressing plate are both provided with corresponding second clamping grooves, and the inner side positioning members are respectively clamped in the corresponding second clamping grooves, and the inner pressing plate is clamped between the inner side positioning members at both ends.

[0018] Further, the outer pressing plate is composed of multiple plate bodies, and each plate body includes a side plate perpendicular to each other and an arc plate connected between the two side plates.

[0019] Further, the inner pressing plate is composed of multiple plate bodies, and chamfers are arranged at the positions where the plate bodies are connected to form a right angle.

[0020] Further, the outer side positioning member includes multiple independent plate bodies, and the inner side positioning member also includes multiple independent plate bodies.

[0021] A method for preparing a carbon fiber corrugated sandwich panel includes the following steps:

[0022] (1) Clean the outer surface of the mold, evenly coat the mold release agent on the outer surface of the mold, lay the pre-cut carbon fiber prepreg on the outer end face surface of the core upper mold and the outer end face surface of the core curved surface mold, and then lay the pre-cut carbon fiber prepreg on the peripheral surface of the side of the core upper mold and the peripheral surface of the side of the core curved surface mold, ensure that the carbon fiber prepreg is laid in a clockwise or counterclockwise circle from the center line of the outer plane of the core upper mold and the core curved surface mold, and then lay the pre-cut carbon fiber prepreg on the inner surface of the core connecting mold and the inner surface of the core side-end mold;

[0023] (2)For the straight section of the mold, lay the pre-cut carbon fiber prepreg between the upper mold of the core and the side mold of the core according to the shape of the Y-shaped core. The carbon fiber prepreg exposed above and below the Y-shaped core is bent to both sides respectively and laid flat on the inner and outer planes of the side mold of the core where the carbon fiber prepreg has been laid on both sides of the Y-shaped core; for the arc section of the mold, lay the pre-cut carbon fiber prepreg between the curved surface mold of the core and the connecting mold of the core according to the shape of the Y-shaped core. The carbon fiber prepreg exposed above and below the Y-shaped core is bent to both sides respectively and laid flat on the inner and outer planes of the connecting mold of the core where the carbon fiber prepreg has been laid on both sides of the Y-shaped core;

[0024] (3)Combine the side mold of the core, the upper mold of the core, the curved surface mold of the core and the connecting mold of the core on which the carbon fiber prepreg has been laid to form a mold combination, and install the outer positioning parts and the inner positioning parts at the corresponding positions of the mold combination;

[0025] (4)Lay the pre-cut carbon fiber prepreg flat on the outer peripheral surface of the mold combination on which the prepreg has been laid to form an outer panel composed of carbon fiber prepreg, and lay the pre-cut carbon fiber prepreg flat on the inner peripheral surface of the mold combination on which the prepreg has been laid to form an inner panel composed of carbon fiber prepreg;

[0026] (5)Use the outer pressing plate and the inner pressing plate to press the inner and outer sides of the mold combination on which the outer panel and the inner panel have been formed in step (4), and clamp the outer pressing plate and the inner pressing plate with a clamp to form a complete mold;

[0027] (6)Place the complete mold in a hot press to cure it. The curing temperature inside the hot press is 100 - 200 °C, the curing pressure is 0.5 - 2 MPa, and the curing time is 1 - 3 h;

[0028] (7)After curing, cool the complete mold to room temperature, remove the clamp, the outer pressing plate, the inner pressing plate, the outer positioning part and the inner positioning part, and remove the upper mold of the core, the side mold of the core, the connecting mold of the core and the curved surface mold of the core one by one to complete demolding;

[0029] (8)Grind the processed part after demolding in step (7) to obtain an integral carbon fiber corrugated sandwich panel.

[0030] Further, the inner panel and the outer panel are respectively composed of 8 - 16 layers of carbon fiber prepreg, and the Y-shaped core is composed of 4 - 12 layers of carbon fiber prepreg.

[0031] Further, a mold cleaning agent or an acetone solution is used to clean the outer surface of the mold in step (1).

[0032] The beneficial effects of the present invention are as follows: Compared with the prior art, a carbon fiber corrugated sandwich panel for battery box protection, its preparation mold and preparation method of the present invention have the following advantages:

[0033] (1) The corrugated sandwich panel of the present invention realizes the embedding of the carbon fiber prepregs at the ends of the upper and lower parts of the Y-shaped core into the upper and lower panels, strengthening the mechanical properties of the structure at the face-core interface. When this structure is subjected to impact loads, the panels and the Y-shaped core will not exhibit the failure mode of face-core debonding. The main failure mode is the crushing failure of the core. Compared with face-core debonding, the load-bearing characteristics and energy absorption characteristics of this failure mode are better, and it has better protection performance for battery box protection;

[0034] (2) The included angle between the inclined plate of the Y-shaped core of the corrugated sandwich panel of the present invention and the outer panel is preferably 45°. Selecting an included angle of 45° can make the inclined plate perpendicular to the outer panel in the arc part of the prepared carbon fiber corrugated sandwich panel. Compared with other included angles, when subjected to a vertical impact at this position, the 45° included angle enables the overall structure to have better load-bearing capacity and can provide better protection for the battery box;

[0035] (3) In the carbon fiber corrugated sandwich panel prepared by the present invention, the total number of layers of the carbon fiber prepregs of the upper and lower panels embedded with the core end prepregs is the same everywhere, making the thickness of the same side panel equal everywhere. When the structure bears impact loads, the force distribution is more uniform, and the protection effect on the battery box is better;

[0036] (4) The mold for preparing the integral corrugated sandwich panel of the present invention has the characteristics of simple structure, reasonable design, reusable, convenient assembly and disassembly. The overall size of the mold can be changed by changing the combination number of the upper core mold and the core connection mold, and then the size of the corrugated sandwich panel can be changed, so that it can be applied to battery boxes of different sizes;

[0037] (5) Using the preparation method described in the present invention can integrally form an integral corrugated sandwich panel, which is convenient for installation. Compared with an independent corrugated sandwich panel only having a straight part, it has a curved corrugated sandwich panel part that connects two straight corrugated sandwich panels perpendicular to each other in space position. This part plays a protective role at the corners of the battery box, that is, the integral corrugated sandwich panel protects the entire outer surface of the battery box, enhancing the protection ability for the battery box. Brief Description of the Drawings

[0038] Figure 1 It is a schematic structural diagram of the carbon fiber corrugated sandwich panel for battery box protection in Embodiment 1 of the present invention;

[0039] Figure 2 It is a schematic structural diagram of the preparation mold of the carbon fiber corrugated sandwich panel for battery box protection in Embodiment 2 of the present invention;

[0040] Figure 3 Schematic diagram of partial structure disassembly of the preparation mold for the carbon fiber corrugated sandwich panel for battery box protection in Embodiment 2 of the present invention;

[0041] Figure 4 Schematic diagram of the structure of the upper core mold and the side core mold in Embodiment 2 of the present invention;

[0042] Figure 5 Schematic diagram of the structure of the core curved surface mold and the core connection mold in Embodiment 2 of the present invention;

[0043] Wherein, 1 outer panel, 2 inner panel, 3 Y-shaped core, 301 inclined plate, 302 platform plate, 303 connecting plate, 4 outer pressure plate, 5 inner pressure plate, 6 core curved surface mold, 7 core connection mold, 8 upper core mold, 9 side core mold, 10 outer positioning member, 11 inner positioning member, 12 first card slot, 13 second card slot. Specific implementation manners

[0044] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0045] Embodiment 1 A carbon fiber corrugated sandwich panel for battery box protection

[0046] As Figure 1 In the shown embodiment, a carbon fiber corrugated sandwich panel for battery box protection includes an outer panel 1, an inner panel 2 and a Y-shaped core 3. The Y-shaped core 3 is disposed between the outer panel 1 and the inner panel 2. The Y-shaped core 3 includes an inclined plate 301, a platform plate 302 and a connecting plate 303. Two inclined plates 301 are symmetrically arranged. The mutually remote ends of the inclined plates 301 are fixedly connected to the outer panel 1. The mutually close sections of the inclined plates 301 are connected by the platform plate 302. One end of the platform plate 302 is connected to the connecting plate 303. The other end of the connecting plate 303 is connected to the inner panel 2.

[0047] In this embodiment, the main body of the outer panel 1 is rectangular, and the corners of the main body of the outer panel 1 are arc-shaped; the whole of the inner panel 2 is rectangular.

[0048] In this embodiment, in the main body part of the outer panel 1, the included angle between the inclined plate 301 and the outer panel 1 is 45°. The platform plate 302 is parallel to the outer panel 1, and the connecting plate 303 is perpendicular to the inner panel 2. In the arc-shaped part of the outer panel 1, the inclined plate 301 is perpendicular to both ends of the arc section, and the connecting plate is connected to the right-angled side of the inner panel 2.

[0049] Embodiment 2 A preparation mold for a carbon fiber corrugated sandwich panel for battery box protection

[0050] As Figures 2 - 5 shown in the embodiment, a preparation mold for a carbon fiber corrugated sandwich panel for battery box protection includes an outer pressing plate 4, an inner pressing plate 5, a core curved surface mold 6, a core connecting mold 7, a core upper end mold 8, a core side end mold 9, an outer positioning member 10 and an inner positioning member 11, wherein:

[0051] The main body of the outer pressing plate 4 is rectangular, and the corners of the main body of the outer pressing plate 4 are arc-shaped; the overall shape of the inner pressing plate 5 is rectangular;

[0052] The core curved surface mold 6, the core connecting mold 7, the core upper end mold 8 and the core side end mold 9 are all arranged between the outer pressing plate 4 and the inner pressing plate 5, wherein: the cross-section of the core curved surface mold 6 is quasi-sector-shaped; the cross-section of the core upper end mold 8 is isosceles trapezoidal; the cross-section of the core side end mold 9 is divided into two parts, the upper half part of the cross-section is trapezoidal, and the lower half part of the cross-section is rectangular; the cross-section of the core connecting mold 7 is irregular nonagon;

[0053] The core curved surface mold 6 is arranged on the arc section of the outer pressing plate 4, and the core connecting molds 7 are arranged on both sides of the core curved surface mold 6. The gap formed between the core curved surface mold 6 and the core connecting mold 7 is matched with the shape of the Y-shaped core 3;

[0054] A plurality of core side end molds 9 are arranged at intervals between the core connecting molds 7 of two adjacent arc sections of the outer pressing plate 4, a core upper end mold 8 is arranged between two adjacent core side end molds 9, and a core upper end mold 8 is also arranged between two adjacent core connecting molds 7 and core side end molds 9; the shape of the gap formed between the core upper end mold 8 and the two core side end molds 9 on its two sides is matched with the shape of the Y-shaped core 3; the shape formed between the core upper end mold 8 and the core side end molds 9 and the core connecting molds 7 on its two sides is also matched with the shape of the Y-shaped core 3;

[0055] There is a gap between the core curved surface mold 6, the core connecting mold 7, the core upper end mold 8 and the core side end mold 9 and the inner side surface of the outer pressing plate 4, and the shape of this gap is matched with the shape of the outer panel 1. The end faces of the core curved surface mold 6, the core connecting mold 7, the core upper end mold 8 and the core side end mold 9 close to the outer pressing plate 4 are all provided with first card slots 12 corresponding in position, and the outer positioning members 10 are respectively clamped in the corresponding first card slots 12, and the outer pressing plate 4 is clamped between the outer positioning members 10 at both ends.

[0056] There is a gap between the core connecting die 7 and the core side die 9 and between the outer side surface of the inner pressing plate 5. The shape of this gap matches the shape of the inner side panel 2. Corresponding second card slots 13 are provided on the end faces of the core connecting die 7 and the core side die 9 close to the inner pressing plate 5. The inner positioning members 11 are respectively clamped in the corresponding second card slots 13, and the inner pressing plate 5 is clamped between the inner positioning members 11 at both ends.

[0057] In this embodiment, the outer pressing plate 4 is composed of multiple plate bodies, and each plate body includes a side plate perpendicular to each other and an arc plate connected between the two side plates.

[0058] In this embodiment, the inner pressing plate 5 is composed of multiple plate bodies, and chamfers are provided at the positions where the plate bodies are connected to form a right angle.

[0059] In this embodiment, the outer positioning member 10 includes multiple independent plate bodies, and the inner positioning member 11 also includes multiple independent plate bodies.

[0060] Embodiment 3 A preparation method of a carbon fiber corrugated sandwich panel for battery box protection

[0061] In this embodiment, the carbon fiber corrugated sandwich panel for battery box protection in Embodiment 1 is prepared by using the die in Embodiment 2. The preparation method includes the following steps:

[0062] (1) After cleaning the outer surfaces of all die components with a mold cleaning agent or acetone solution, apply a release agent evenly on the surfaces of all die components. Lay 4 layers of pre-cut carbon fiber prepregs on the outer surface of the core upper die 8 and the outer surface of the core curved die 6, and then lay 4 layers of pre-cut carbon fiber prepregs on the peripheral surfaces of the core upper die 8 and the core curved die 6, ensuring that the carbon fiber prepregs are laid in a clockwise or counterclockwise circle from the center line of the outer plane of the core upper die 8. The laying method of the core curved die 6 is the same. Then lay 4 layers of pre-cut carbon fiber prepregs on the inner surface of the core connecting die 7 and the inner surface of the core side die 9;

[0063] (2)For the straight section of the mold, lay 8 layers of pre-cut carbon fiber prepregs between the upper mold 8 of the core and the side mold 9 of the core according to the shape of the Y-shaped core 3, ensuring that 4 layers of carbon fiber prepregs are respectively provided at the inclined plate 301 and the platform plate 302. The carbon fiber prepregs exposed above and below the Y-shaped core 3 are bent to both sides and laid flat on the inner and outer planes of the side mold 9 of the core where carbon fiber prepregs have been laid on both sides of the Y-shaped core 3; for the curved part of the mold, lay 8 layers of pre-cut carbon fiber prepregs between the curved surface mold 6 of the core and the connecting mold 7 of the core according to the shape of the Y-shaped core 3, ensuring that 4 layers of carbon fiber prepregs are provided at the inclined plate 301 and the platform plate 302. The carbon fiber prepregs exposed above and below the Y-shaped core 3 are bent to both sides and laid flat on the inner and outer planes of the connecting mold 7 of the core where carbon fiber prepregs have been laid on both sides of the Y-shaped core 3;

[0064] (3)Combine the side mold 9 of the core, the upper mold 8 of the core, the curved surface mold 6 of the core and the connecting mold 7 of the core on which the carbon fiber prepregs have been laid to form a mold combination, and respectively install the outer positioning member 10 and the inner positioning member 11 into the first card slot and the third card slot of the mold combination;

[0065] (4)Lay the other 4 layers of pre-cut carbon fiber prepregs flat on the outer surface of the mold combination on which the prepregs have been laid to form an outer panel 1 composed of 12 layers of carbon fiber prepregs, and embed the end of the upper part of the Y-shaped core 3 into the middle of the outer panel 1 to strengthen the mechanical properties at the surface-core interface. Lay 4 layers of pre-cut carbon fiber prepregs flat on the inner surface of the mold combination to form an inner panel 2 composed of 12 layers of carbon fiber prepregs;

[0066] (5)Use the outer pressing plate 4 and the inner pressing plate 5 to press the inner and outer sides of the mold combination on which the outer panel 1 and the inner panel 2 have been formed in step (4), and clamp the outer pressing plate 4 and the inner pressing plate 5 with a clamp to form a complete mold;

[0067] (6)Place the complete mold in step (5) in a hot press to cure it. The curing temperature inside the hot press is 100 - 200 °C, the curing pressure is 0.5 - 2 MPa, and the curing time is 1 - 3 h;

[0068] (7)After curing, cool the complete mold to room temperature, remove the clamp, the outer pressing plate 4, the inner pressing plate 5, the outer positioning member 10 and the inner positioning member 11, and remove the upper mold 8 of the core, the side mold 9 of the core, the connecting mold 7 of the core and the curved surface mold 6 of the core one by one to complete demolding;

[0069] (8)Grind the processed part after demolding in step (7) to obtain an integral carbon fiber corrugated sandwich panel.

[0070] The above specific embodiments are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product forms and styles of the above specific embodiments. Any appropriate changes or modifications made by any person of ordinary skill in the art that meet the claims of the present invention shall fall within the patent protection scope of the present invention.

Claims

1. A preparation mold for a carbon fiber corrugated sandwich panel. The carbon fiber corrugated sandwich panel to be prepared includes an outer panel, an inner panel, and a Y-shaped core. The Y-shaped core is disposed between the outer panel and the inner panel. The Y-shaped core includes inclined plates, a platform plate, and connecting plates. There are two symmetrically arranged inclined plates. The mutually remote ends of the inclined plates are fixedly connected to the outer panel. The mutually close sections of the inclined plates are connected by the platform plate. One end of the platform plate is connected to one end of the connecting plate, and the other end of the connecting plate is connected to the inner panel. The main body of the outer panel is rectangular, and the corners of the main body of the outer panel are arc-shaped; the whole of the inner panel is rectangular; characterized in that: The preparation mold for the carbon fiber corrugated sandwich panel includes an outer pressing plate, an inner pressing plate, a core curved surface mold, a core connection mold, a core upper mold, a core side mold, an outer positioning member, and an inner positioning member, where: The main body of the outer pressing plate is rectangular, and the corners of the main body of the outer pressing plate are arc-shaped; The overall shape of the inner pressing plate is rectangular; The core curved surface mold, the core connection mold, the core upper mold, and the core side mold are all arranged between the outer pressing plate and the inner pressing plate. The core curved surface mold is arranged on the arc section of the outer pressing plate, and the core connection molds are arranged on both sides of the core curved surface mold. The gap formed between the core curved surface mold and the core connection mold matches the shape of the Y-shaped core; Multiple core side molds are arranged at intervals between the core connection molds on the adjacent two arc sections of the outer pressing plate. The core upper mold is arranged between two adjacent core side molds, and the core upper mold is also arranged between two adjacent core connection molds and core side molds; The shape of the gap formed between the core upper mold and the two core side molds on its two sides matches the shape of the Y-shaped core; The shape formed between the core upper mold and the core side molds and core connection molds on its two sides also matches the shape of the Y-shaped core; There is a gap between the core curved surface mold, the core connection mold, the core upper mold, the core side mold and the inner side surface of the outer pressing plate, and the shape of this gap matches the shape of the outer panel. The end faces of the core curved surface mold, the core connection mold, the core upper mold, and the core side mold close to the outer pressing plate are all provided with first card slots corresponding in position. The outer positioning members are respectively clamped in the corresponding first card slots, and the outer pressing plate is clamped between the outer positioning members at both ends; There is a gap between the core connection mold and the core side mold and the outer side surface of the inner pressing plate, and the shape of this gap matches the shape of the inner panel. The end faces of the core connection mold and the core side mold close to the inner pressing plate are both provided with corresponding second card slots. The inner positioning members are respectively clamped in the corresponding second card slots, and the inner pressing plate is clamped between the inner positioning members at both ends.

2. The preparation mold of the carbon fiber corrugated sandwich panel according to claim 1, characterized in that: In the main body part of the outer panel, the included angle between the inclined plate and the outer panel is 35-60°, the platform plate is parallel to the outer panel, and the connecting plate is perpendicular to the inner panel; In the arc part of the outer panel, the inclined plate is perpendicular to both ends of the arc section, and the connecting plate is connected to the right-angle side of the inner panel.

3. The preparation mold of the carbon fiber corrugated sandwich panel according to claim 1, characterized in that: The outer pressing plate is composed of multiple plate bodies, and each plate body includes a side plate perpendicular to each other and an arc plate connected between the two side plates.

4. The manufacturing mold of the carbon fiber corrugated sandwich panel according to claim 1, characterized in that: The inner pressing plate is composed of multiple plate bodies, and chamfers are provided at the positions where the plate bodies are connected to form a right angle.

5. The preparation mold of a carbon fiber corrugated sandwich panel according to claim 1, characterized in that: The outer positioning member includes multiple independent plate bodies, and the inner positioning member also includes multiple independent plate bodies.

6. A method for preparing a carbon fiber corrugated sandwich panel using the preparation mold of the carbon fiber corrugated sandwich panel described in claim 1, characterized in that: It includes the following steps: (1)Clean the outer surface of the mold, evenly coat the mold release agent on the outer surface of the mold, lay the pre-cut carbon fiber prepreg on the outer end surface of the upper mold of the core and the outer end surface of the curved mold of the core, and then lay the pre-cut carbon fiber prepreg on the surrounding surfaces of the sides of the upper mold of the core and the surrounding surfaces of the sides of the curved mold of the core, ensuring that the carbon fiber prepreg is laid in a clockwise or counterclockwise circle from the center line of the outer plane of the upper mold of the core and the curved mold of the core, and then lay the pre-cut carbon fiber prepreg on the inner surface of the connecting mold of the core and the inner surface of the side-end mold of the core; (2)For the straight section of the mold, lay the pre-cut carbon fiber prepreg between the upper mold of the core and the side-end mold of the core according to the shape of the Y-shaped core. The carbon fiber prepreg exposed above and below the Y-shaped core is bent to both sides and laid flat on the inner and outer planes of the side-end mold of the core where the carbon fiber prepreg has been laid on both sides of the Y-shaped core; for the curved section of the mold, lay the pre-cut carbon fiber prepreg between the curved mold of the core and the connecting mold of the core according to the shape of the Y-shaped core. The carbon fiber prepreg exposed above and below the Y-shaped core is bent to both sides and laid flat on the inner and outer planes of the connecting mold of the core where the carbon fiber prepreg has been laid on both sides of the Y-shaped core; (3)Combine the side-end mold of the core, the upper mold of the core, the curved mold of the core and the connecting mold of the core on which the carbon fiber prepreg has been laid to form a mold combination, and install the outer positioning parts and inner positioning parts at the corresponding positions of the mold combination; (4)Lay the pre-cut carbon fiber prepreg flat on the outer surrounding surface of the mold combination on which the prepreg has been laid to form an outer panel composed of carbon fiber prepreg, and lay the pre-cut carbon fiber prepreg flat on the inner surrounding surface of the mold combination on which the prepreg has been laid to form an inner panel composed of carbon fiber prepreg; (5)Use the outer pressing plate and the inner pressing plate to press the inner and outer sides of the mold combination on which the outer panel and the inner panel have been formed in step (4), and clamp the outer pressing plate and the inner pressing plate with a fixture to form a complete mold; (6)Place the complete mold in step (5) in a hot press for curing. The curing temperature inside the hot press is 100 - 200 °C, the curing pressure is 0.5 - 2 MPa, and the curing time is 1 - 3 h; (7)After curing, cool the complete mold to room temperature, remove the fixture, the outer pressing plate, the inner pressing plate, the outer positioning part and the inner positioning part, and remove the upper mold of the core, the side-end mold of the core, the connecting mold of the core and the curved mold of the core one by one to complete demolding; (8)Grind the processed part after demolding in step (7) to obtain an integral carbon fiber corrugated sandwich panel.

7. The method for preparing a carbon fiber corrugated sandwich panel according to claim 6, wherein: The inner panel and the outer panel are each composed of 8 - 16 layers of carbon fiber prepreg, and the Y-shaped core is composed of 4 - 12 layers of carbon fiber prepreg.

8. The method for preparing a carbon fiber corrugated sandwich panel according to claim 6, characterized in that: Acetone solution is used to clean the outer surface of the mold in step (1).

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