Battery shell lamination hot press molding process and equipment based on prepreg

Abstract

The invention discloses a prepreg-based battery case lamination hot press molding process and equipment, and relates to the technical field of battery case lamination hot press molding, the prepreg-based battery case lamination hot press molding equipment comprises a coil holder, a melt impregnation mechanism, an edge pressing mechanism and a heat tracing frame, the melt impregnation mechanism is mounted on one side of the coil holder, the heat tracing frame is arranged on the other side of the coil holder, and the edge pressing mechanism is arranged between the coil holder and the heat tracing frame; the melt impregnation mechanism comprises a guide frame arranged on one side of the coil holder; through rubbing of convex strips of the transmission rollers and lateral extension of the conical rollers, infiltration of resin to fibers is actively promoted in the forming process, meanwhile, lateral extrusion and extension of a composite material are achieved in combination with the first adjustable conical roller and the second adjustable conical roller in the edge pressing mechanism, interlayer bubbles are effectively discharged, the material compactness and the interlayer bonding strength are improved, and the service life of the composite material is prolonged. According to the integrated equipment, full-continuous production from raw materials to prepreg sheets is realized, the production efficiency is greatly improved, and meanwhile, the high consistency of the materials in thickness, wettability and mechanical property is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of battery case lamination hot pressing technology, specifically to battery case lamination hot pressing process and equipment based on prepreg. Background Technology

[0002] In recent years, with the rapid development of the new energy vehicle industry, higher requirements have been put forward for the lightweight, high safety and low cost manufacturing of battery packs. As a key structural component of the battery pack, the manufacturing process of the battery shell is shifting from traditional metal stamping to composite material molding, especially the prepreg laminate hot pressing molding technology represented by continuous fiber reinforced thermoplastic composite materials. This technology can achieve significant weight reduction while giving the shell excellent specific strength, impact resistance and corrosion resistance, and has become a research hotspot in the industry. To improve the performance of the casing, various material combination schemes have emerged, such as the battery box cover preparation method and battery box cover disclosed in CN116247363A. This scheme involves stacking prepreg layers and ceramic fiber layers, and then molding and curing them under conditions of 200-220℃ and 2-4MPa. Although this method aims to improve the protective performance and simplify the production steps by introducing functional layers, it is essentially still a discrete process framework of "layering-post-curing". It uses cured or semi-cured prepreg blanks and functional layers to be stacked, and then heats and pressurizes them in the mold to complete the curing and composite. Air is easily trapped between the layers, and air is vented by the resin flow in the mold, which easily produces bubble defects. To address this, we propose a hot-pressing process and equipment for battery casing lamination based on prepreg. Summary of the Invention

[0003] The purpose of this invention is to provide a hot pressing process and equipment for battery casing lamination based on prepreg, thereby solving the problems mentioned in the background art; To achieve the above objectives, the present invention provides the following technical solution: a battery casing stacking hot pressing molding equipment based on prepreg, comprising a wire frame, a melt impregnation mechanism, a pressing mechanism, and a heat tracing frame. The melt impregnation mechanism is installed on one side of the wire frame, and a heat tracing frame is provided on the other side. The pressing mechanism is provided between the two. The melt impregnation mechanism includes a guide frame provided on one side of the wire frame. Glass fiber felt rollers are symmetrically installed on the top of the guide frame. A guide cylinder is provided on the guide frame at the bottom of the glass fiber felt rollers. A transmission roller is movably connected to the guide frame at the bottom of the guide cylinder. The surface of the transmission roller is uniformly provided with raised strips. Three guide cylinders are provided and are rotatably distributed along the axis of the transmission rollers. A T-shaped die head is installed at the bottom of the guide cylinder. Composite anti-stick rollers are installed on the guide frame and at the material guide cylinders on both sides. High-temperature resistant anti-stick conveyor belts are fitted on the composite anti-stick rollers. The pressing mechanism includes fixed frames and movable frames symmetrically arranged on the wire frame. Conical roller 2 and conical roller 1 are movably connected to the fixed frames on both sides, and conical roller 1 and conical roller 2 are movably connected to the movable frames on both sides. The fixed frames and movable frames distributed vertically on one side form a group for unfolding and conveying the composite material. A heat tracing frame is provided on the other side of the wire frame, and a heating plate is movably connected to the heat tracing frame.

[0004] Furthermore, the melt impregnation mechanism also includes a granule cylinder disposed on the top of the guide frame. The granule cylinder is connected to three guide cylinders through a pipe. The granule cylinder is used for storing and guiding the plasticized melt product of the extruder. A winding shaft is movably connected inside the guide cylinder. One end of the winding shaft passes through the guide cylinder and is fitted with a gear.

[0005] Furthermore, the wire frame is equipped with a motor and a drive shaft. The motor rotates to drive the drive shaft to rotate. One end of the drive shaft is connected to a transmission roller. A toothed sleeve is installed on the side of the transmission roller, and the toothed sleeve meshes with a gear on the guide cylinder side of the vertical surface.

[0006] Furthermore, a positioning sleeve is fixed on the wire frame and is sleeved with the power shaft. An eccentric wheel is fixed on the power shaft, and a swing sleeve 1 is movably sleeved on the eccentric wheel. A swing sleeve 2 is also movably sleeved on the power shaft. A cone block 1 is movably connected to one side of the swing sleeve 1 and is slidably connected to the positioning sleeve. A cone block 2 is movably connected to the other side of the swing sleeve 1 and is slidably connected to the groove on the swing sleeve 2. Straight grooves are evenly arranged on the inner wall of the toothed sleeve located on the second side of the swing sleeve.

[0007] Furthermore, the pressing mechanism includes an adjusting screw mounted on the frame, the adjusting screw passing through the connection between the two movable frames, and the movable frame sliding is driven by the rotation of the adjusting screw.

[0008] Furthermore, a cylinder is rotatably connected to the top of the heat tracing frame, and a rotating arm is movably connected to the end of the cylinder. The rotating arm is rotatably connected to the heat tracing frame and slides on one side with the groove on the heating plate. The position adjustment and control of the heating plate is achieved by rotating the rotating arm.

[0009] Battery casing lamination hot pressing process based on prepreg Includes the following steps: Step 1: The raw materials are laminated and extended layer by layer. High-flow and high-toughness polypropylene granules are plasticized and melted through a precision extruder and discharged into the granule cylinder for storage. The continuous glass fiber fabric roll is installed on the glass fiber felt roller, and both sides are pulled down simultaneously through both sides of the central guide cylinder, and then placed between the composite anti-stick rollers through the guide roller. The rotation of the drive shaft drives the rotation of the transmission roller, and the rotation of the eccentric wheel on the drive roller drives the swing sleeve to move up and down. At the same time, it drives the cone block one and cone block two to move up and down synchronously. When they contact the tooth sleeve, they drive the tooth sleeve to rotate. The rotation of the tooth sleeve completes the rotation of the winding shaft in the three guide cylinders, continuously discharging the molten plastic into the T-shaped die head. The molten plastic curtain falls down in the form of a thin sheet. Under pressure, the molten plastic curtain meets the continuously conveyed glass fiber mat, and with the help of the rotating and scraping of the convex strips on the surface of the drive roller, the molten plastic at the bottom is continuously extended to both sides of the glass fiber mat. Step 2: Press the material with the subsequent conical rollers 1 and 2 and the subsequent heating rollers to form a fully impregnated composite material sheet; Step 3: Cutting and stacking design. Cut the continuous sheet material obtained above according to the unfolded size of the battery casing to obtain the blank. Then, according to the required thickness and strength of different parts of the battery casing, carry out the stacking design. Step 4: Place the stacked blanks into the preheated mold, close the mold and apply pressure. The molten PP flows along with the fibers under high pressure, filling the mold cavity.

[0010] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the unique mechanical linkage design in the melt impregnation mechanism enables the timed and quantitative intermittent feeding of molten plastic and the continuous stretching of glass fiber mat to be carried out simultaneously. The convex strip structure on the surface of the transmission roller further promotes the uniform stretching of plastic on the surface of the fiber mat, avoiding accumulation and voids. Combined with the adjustable conical roller one and conical roller two in the pressing mechanism, the lateral extrusion and stretching of the composite material are realized, effectively removing interlayer air bubbles and improving the material density and interlayer bonding strength. This integrated equipment realizes fully continuous production from raw materials to prepreg sheets, greatly improving production efficiency, while ensuring a high degree of consistency in material thickness, wettability and mechanical properties. This process employs a "three-layer adhesive sandwiched with two-layer felt" stacked structure design. Through the arrangement of multiple guide cylinders and T-shaped mold heads, it achieves precise composite bonding of multiple layers of molten plastic and glass fiber felt. The stacked blank is then subjected to controllable hot pressing with the assistance of a heating frame and heating plate. This allows the polypropylene to drive the fibers to flow evenly under high pressure and fill the mold cavity, forming a battery casing product with a complete structure and uniform fiber distribution. This process not only enhances the overall strength, toughness, and impact resistance of the battery casing but also reduces thermal stress and deformation during the molding process through preheating and segmented pressing, improving the dimensional stability and surface quality of the product. It is suitable for manufacturing power battery casings with strict requirements for lightweight and high safety. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the battery casing lamination hot pressing molding equipment for the prepreg material of the present invention; Figure 2 This is a schematic diagram of the overall structure of the melt impregnation mechanism of the present invention; Figure 3 This is a schematic diagram of the inner transmission roller mounting structure of the guide frame of the present invention; Figure 4 This is a schematic diagram of the installation structure of the inner winding shaft of the guide cylinder of the present invention; Figure 5 This is a schematic diagram of the installation structure of the internal components of the single-sided toothed sleeve of the transmission roller of the present invention; Figure 6 This is a schematic diagram of the overall structure of the pressing mechanism of the present invention; Figure 7 This is a simplified structural diagram of the hot-pressing process for stacking battery casings using the prepreg material of this invention.

[0012] In the diagram: 1. Wire frame; 2. Melt impregnation mechanism; 201. Guide frame; 202. Drive roller; 203. Fiberglass felt roller; 204. Feed guide cylinder; 205. Granule cylinder; 206. Composite anti-stick roller; 3. Pressing mechanism; 301. Fixed frame; 302. Movable frame; 303. Conical roller one; 304. Conical roller two; 305. Adjusting screw; 4. Heat tracing frame; 5. Rolling shaft; 6. T-shaped die head; 7. Power shaft; 8. Positioning sleeve; 9. Eccentric wheel; 10. Swing sleeve one; 11. Swing sleeve two; 12. Conical block one; 13. Conical block two; 14. Gear sleeve; 15. Rotating arm; 16. Heating plate. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Please see Figure 1-7 The present invention provides a technical solution: Example 1: The battery casing lamination hot pressing molding equipment of the present invention achieves continuous preparation and hot pressing molding of a "three-adhesive sandwich two-felt" structure through the coordinated operation of the melt impregnation mechanism 2, the pressing mechanism 3, and the heating frame 4. The equipment is arranged on the frame 1. The melt impregnation mechanism 2 is located on one side and is used to composite molten polypropylene with glass fiber felt. The pressing mechanism 3 is located in the middle and is used to stretch and pre-press the composite sheet. The heating frame 4 is located on the other side and is used to heat the molding composite material during the movement. The complete battery casing lamination hot pressing molding is not shown, except... Figure 1 The device shown is further equipped with a continuous hot press roller and a cooling mechanism. The structure is the same as the existing one, so it will not be described in detail. In specific operations, such as Figure 1As shown, a melt impregnation mechanism 2 is installed on one side of the wire frame 1, including a guide frame 201, a glass fiber felt roller 203, a guide cylinder 204, a transmission roller 202, a granule cylinder 205, and a composite anti-stick roller 206. That is, in addition to the "three glues sandwiched with two felts" structure, there are also high temperature resistant anti-stick conveyor belts on both sides of the composite anti-stick rollers 206, for a total of seven layers. The two glass fiber felt rollers 203 are symmetrically arranged to supply the upper and lower layers of glass fiber felt respectively. The molten plastic curtain is guided down through the guide cylinder 204 in the middle to form a sandwich structure of "three glues sandwiched with two felts". The surface of the drive roller 202 is provided with raised strips, which scrape and stretch the molten plastic falling on the composite anti-stick roller 206 during rotation, promoting the adhesion of the plastic and the fiber felt; The pressing mechanism 3 includes a fixed frame 301 and a movable frame 302, on which a first conical roller 303 and a second conical roller 304 are respectively installed. The position of the movable frame 302 can be adjusted by adjusting the screw 305, thereby controlling the pressure and gap between the conical rollers and realizing the gradual stretching and pre-pressing of the composite sheet. The heating frame 4 is equipped with a heating plate 16. The lifting and angle adjustment of the heating plate can be realized by driving the rotating arm 15 with a cylinder, which facilitates uniform heating of composite materials of different thicknesses. In actual production, polypropylene granules are first plasticized by an extruder and stored in the granule cylinder 205. Glass fiber mat is drawn out from the glass fiber mat roller 203 and guided by the guide roller to the area between the composite anti-stick rollers 206. Figure 7 As shown, after the motor is started, the power shaft 7 drives the transmission roller 202 to rotate continuously. At the same time, through the linkage mechanism of eccentric wheel 9, swing sleeve 10, cone block 12, and cone block 2 13, the gear sleeve 14 is driven to rotate intermittently, which in turn drives the winding shaft 5 in the three guide cylinders 204 to rotate intermittently, so as to realize the timed and quantitative discharge of molten plastic. The molten plastic falls in a curtain shape through the T-shaped die head 6. The bottom glass fiber mat is fully bonded to the molten plastic under the scraping action of the transmission roller 202. Then, it is covered by glass fiber mat and hot melt plastic on the other side to form a preliminary composite sheet. Subsequently, the composite sheet enters the pressing mechanism 3, and is subjected to inclined extrusion by the first conical roller 303 and the second conical roller 304, causing the molten plastic in the interlayer to extend to both sides under the combined action of gravity and pressure, expelling air bubbles, and improving the density and quality of the material. Finally, the composite sheet is cut and stacked according to the battery shell size, placed in a preheated mold, and finally hot-pressed by the heating plate 16 of the heating frame 4 to obtain a battery shell product with uniform structure and high strength.

[0015] Example 2: This example focuses on illustrating the linkage mechanism between intermittent feeding and continuous extension in the melt impregnation mechanism 2, as well as the process advantages of conical roller extension and venting. like Figures 2 to 5As shown, the core of the melt impregnation mechanism 2 is to realize the intermittent feeding of molten plastic and the continuous extension of glass fiber mat. The power shaft 7 is driven by a motor to rotate continuously. One end of the shaft is connected to the transmission roller 202, which drives it to rotate continuously. The other end drives the swing sleeve 10 to swing up and down through the eccentric wheel 9. The swing sleeve 10 is slidably connected to the positioning sleeve 8 through the cone block 12 and slidably connected to the groove of the swing sleeve 21 through the cone block 23. When the swing sleeve 10 moves up and down, it maintains its own posture roughly unchanged. The cone block 12 and the cone block 23 move synchronously and intermittently mesh with the straight groove on the inner side of the tooth sleeve 14, driving the tooth sleeve 14 to rotate at small angle intervals. The gear sleeve 14 meshes with the gear on the intermediate guide cylinder 204. The gears of the three guide cylinders 204 are arranged in an arc shape and mesh with each other, thereby realizing the synchronous and interval rotation of the three roll shafts 5. The molten plastic is discharged uniformly from the T-shaped die head 6. This design not only ensures the timed and quantitative feeding of molten plastic, but also achieves the scraping and stretching of molten plastic through the continuous rotation of the transmission roller 202, avoiding plastic accumulation or uneven distribution. like Figure 6 As shown, the cone rollers 303 and 304 in the pressing mechanism 3 are arranged at an angle and the roller surface is conical. They can generate lateral extrusion force when the composite sheet passes through. Since the molten plastic is only placed in two-thirds of the area in the width direction of the glass fiber mat, the extrusion action of the inclined cone rollers can make the molten plastic gradually extend to both sides in the interlayer, while expelling the air in the interlayer, significantly reducing bubble defects and improving the consistency and mechanical properties of the composite material. In addition, when the power shaft 7 stops rotating, the first cone block 12 and the second cone block 13 remain engaged with the gear sleeve 14 to lock the roll shaft 5, prevent plastic from flowing out, and ensure process controllability. In summary, this invention achieves coordinated control of material feeding and stretching through mechanical linkage, and combines conical roller stretching and venting process to produce a uniform and bubble-free "three-adhesive sandwiched with two-felt" prepreg sheet, which is suitable for the lamination and hot pressing of high-performance battery shells and has the advantages of high production efficiency, stable quality and wide applicability.

[0016] The technological principle of this invention is as follows: Phase 1: Online impregnation and lamination; The equipment converts the continuous rotation of the power shaft 7 into the intermittent rotation of the three roll shafts 5 through a mechanical linkage mechanism, thereby precisely controlling the timed and quantitative drop of molten polypropylene from the T-die head 6 in a curtain shape. The upper and lower layers of fiber felt drawn from the glass fiber felt roller 203 are continuously conveyed and merged with the three layers of resin curtain falling in the middle at the transmission roller 202, initially forming a five-layer sandwich structure. When the drive roller 202 with raised strips on its surface rotates, it will "scrape" the molten resin at the bottom, causing it to extend laterally on the surface of the fiber felt. This greatly improves the initial wetting effect of the resin on the fiber and avoids the problems of resin accumulation or uneven distribution in traditional processes. Phase Two: Roller Pressing and Exhausting; A pair of conical rollers 303 and 304 are arranged at a specific angle. When the material passes through, the conical roller surface generates a radially outward lateral extrusion force. This lateral force drives the thicker resin in the middle of the interlayer to flow to the edges of the material, thereby expelling the interlayer air, effectively reducing bubble defects in the final product, and making the resin distribution more uniform and the fiber impregnation more complete. Phase 3: Cutting and Lamination; The continuous, high-quality prepreg sheets produced by the aforementioned processes are cut into blanks of specific sizes. Based on the thickness and strength requirements of different parts of the battery casing, these blanks are laminated to prepare for final molding. Stage 4: Final hot pressing; The stacked blanks are placed into a preheated mold, and the heating plate 16 on the heating frame 4 provides preheating. After the mold is closed, high pressure is applied. Under high temperature and high pressure, the polypropylene resin melts again, which drives the glass fiber to flow together and fully fill the mold cavity. Finally, it cools and solidifies to form a battery casing with an integrated structure and excellent performance.

[0017] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0018] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0019] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A battery casing lamination hot pressing molding equipment based on prepreg, comprising a wire frame (1), a melt impregnation mechanism (2), a pressing mechanism (3), and a heat tracing frame (4), wherein the melt impregnation mechanism (2) is installed on one side of the wire frame (1), and the heat tracing frame (4) is provided on the other side, and the pressing mechanism (3) is provided between the two, characterized in that, The melt impregnation mechanism (2) includes a guide frame (201) set on one side of the wire frame (1), glass fiber felt rollers (203) are symmetrically installed on the top of the guide frame (201), a guide cylinder (204) is set on the guide frame (201) at the bottom of the glass fiber felt rollers (203), a transmission roller (202) is movably connected to the guide frame (201) at the bottom of the guide cylinder (204), and the surface of the transmission roller (202) is uniformly provided with convex strips. Three guide cylinders (204) are provided and rotated along the axis of the transmission roller (202). A T-shaped die head (6) is installed at the bottom of the guide cylinder (204). A composite anti-stick roller (206) is provided on the guide frame (201) and located at the guide cylinders (204) on both sides. A high-temperature resistant anti-stick conveyor belt is sleeved on the composite anti-stick roller (206). The pressing mechanism (3) includes a fixed frame (301) and a movable frame (302) symmetrically arranged on the wire frame (1). Conical roller II (304) and conical roller I (303) are movably connected on the fixed frames (301) on both sides, and conical roller I (303) and conical roller II (304) are movably connected on the movable frames (302) on both sides. The fixed frame (301) and the movable frame (302) vertically distributed on one side are a group for unfolding and conveying the composite material. A heat tracing frame (4) is provided on the other side of the wire frame (1). A heating plate (16) is movably connected on the heat tracing frame (4).

2. The battery casing lamination hot pressing equipment based on prepreg according to claim 1, characterized in that, The melt impregnation mechanism (2) also includes a granule cylinder (205) set on the top of the guide frame (201). The granule cylinder (205) is connected to three guide cylinders (204) through a pipe. The granule cylinder (205) is used for storing and guiding the plasticized melt product of the extruder. A coil shaft (5) is movably connected inside the guide cylinder (204). One end of the coil shaft (5) passes through the guide cylinder (204) and is fitted with a gear.

3. The battery casing lamination hot pressing equipment based on prepreg according to claim 2, characterized in that, The wire frame (1) is equipped with a motor and a power shaft (7). The motor rotates to drive the power shaft (7) to rotate. One end of the power shaft (7) is connected to the transmission roller (202). A toothed sleeve (14) is installed on the side of the transmission roller (202). The toothed sleeve (14) meshes with the gear on the side of the guide cylinder (204) on the vertical surface.

4. The battery casing lamination hot pressing equipment based on prepreg according to claim 3, characterized in that, The wire frame (1) is fixed with a positioning sleeve (8), and the positioning sleeve (8) is sleeved with the power shaft (7). An eccentric wheel (9) is fixed on the power shaft (7), and a swing sleeve (10) is movably sleeved on the eccentric wheel (9). A swing sleeve (2) (11) is also movably sleeved on the power shaft (7). A cone block (12) is movably connected to one side of the swing sleeve (10). The cone block (12) is slidably connected to the positioning sleeve (8). A cone block (2) (13) is movably connected to the other side of the swing sleeve (10). The cone block (2) (13) is slidably connected to the groove on the swing sleeve (2) (11). The toothed sleeve (14) is uniformly provided with straight grooves on the inner wall of the swing sleeve (2) (11).

5. The battery casing lamination hot pressing equipment based on prepreg according to claim 1, characterized in that, The pressing mechanism (3) includes an adjusting screw (305) mounted on the wire frame (1). The adjusting screw (305) passes through the connection between the two movable frames (302) and drives the movable frame (302) to slide by rotating the adjusting screw (305).

6. The battery casing lamination hot pressing equipment based on prepreg according to claim 1, characterized in that, The top of the heat tracing rack (4) is rotatably connected to a cylinder, and the end of the cylinder is movably connected to a rotating arm (15). The rotating arm (15) is rotatably connected to the heat tracing rack (4), and one side is slidably connected to the groove on the heating plate (16). The position adjustment and control of the heating plate (16) is realized by rotating the rotating arm (15).

7. A battery casing lamination hot pressing process based on prepreg, characterized in that, This is achieved using the battery casing lamination hot pressing molding equipment based on prepreg as described in any one of claims 1-6, and includes the following steps: Step 1: The raw materials are laminated and extended layer by layer. High-flow and high-toughness polypropylene granules are plasticized and melted by a precision extruder and discharged into the granule cylinder (205) for storage. The continuous glass fiber fabric roll is installed on the glass fiber felt roller (203) and pulled down from both sides at the same time through both sides of the central guide cylinder (204), and then placed between the composite anti-stick rollers (206) through the guide roller. The drive roller (202) rotates by rotating the drive shaft (7), and the eccentric wheel (9) on the drive roller rotates to move the swing sleeve (10) up and down. At the same time, it drives the cone block (12) and the cone block (13) to move up and down synchronously. When it contacts the tooth sleeve (14), it drives the tooth sleeve (14) to rotate. The rotation of the tooth sleeve (14) completes the rotation of the winding shaft (5) in the three guide cylinders (204), continuously feeding the molten plastic into the T-shaped die head (6). When the thin sheet-like molten curtain falls, the molten plastic curtain meets the continuously conveyed glass fiber mat under pressure, and cooperates with the rotating scraping of the convex strips on the surface of the drive roller (202) to continuously extend the bottom molten plastic to both sides of the glass fiber mat. Step 2: Press the material with the subsequent conical roller 1 (303), conical roller 2 (304) and subsequent heating roller to form a fully impregnated composite material sheet; Step 3: Cutting and stacking design. Cut the continuous sheet material obtained above according to the unfolded size of the battery casing to obtain the blank. Then, according to the required thickness and strength of different parts of the battery casing, carry out the stacking design. Step 4: Place the stacked blanks into the preheated mold, close the mold and apply pressure. The molten PP flows along with the fibers under high pressure, filling the mold cavity.

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