A lightweight thermally insulated battery housing and its manufacturing process and prefabrication system

Abstract

This invention discloses a lightweight, insulated battery box, comprising a glass fiber inner panel and a glass fiber outer panel disposed around the periphery of the glass fiber inner panel, with a sandwich panel between the glass fiber inner panel and the glass fiber outer panel. It also includes a manufacturing process and prefabrication system for the lightweight, insulated battery box. The invention improves the insulation and impact resistance of the box, and the pre-forming process for the sandwich foam material results in a simple structure for the foam material, reducing waste and simplifying the precision required for cutting the foam material, leading to better product consistency. Furthermore, the fiber composite material is laid through a simple rotational movement via a dual-line movement of the pre-formed mold and the conveying device.

Description

Technical Field

[0001] This invention relates to the field of battery box technology, specifically to a lightweight insulated battery box and its manufacturing process and prefabrication system. Background Technology

[0002] Most existing new energy vehicle batteries have a lower casing made of steel, such as aluminum alloy. The battery cell operating temperature needs to be maintained within a constant range. In cold temperatures, heating elements are used inside the battery for heating. Especially in cold environments, the battery needs to consume a lot of extra electrical energy, resulting in energy waste.

[0003] A heated and insulated battery box (publication number: CN205429030U) has a hollow structure. The outer layer is a carbon fiber unidirectional prepreg layer, the middle layer contains PU heated foam filling material, and the inner layer is a glass fiber unidirectional prepreg layer, etc. The insulation effect is mainly improved through layering. However, this box has a complex structure and does not provide a processing solution for the PU heated foam filling material. The foam filling material is easily broken during processing, making processing difficult and resulting in low product integration.

[0004] Therefore, there is a need for a lightweight thermal insulation battery box, its manufacturing process, and a prefabrication system to improve the sandwich structure and reduce its manufacturing difficulty. Summary of the Invention

[0005] The purpose of this invention is to provide a lightweight thermal insulation battery box, its manufacturing process and prefabrication system, in order to solve the technical problems of complex sandwich structure and high production difficulty in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0007] The present invention provides a lightweight heat-insulating battery box, including a glass fiber inner panel and a glass fiber outer panel disposed around the glass fiber inner panel, wherein a sandwich panel is disposed between the glass fiber inner panel and the glass fiber outer panel, and the sandwich panel is made of pre-foamed board.

[0008] The edges of the inner and outer glass fiber panels extend outward to form an L-shaped bend, which is fixedly connected by several hanging point metal reinforcements.

[0009] This invention provides a manufacturing process for a lightweight, heat-insulating battery casing, comprising the following steps:

[0010] Polyurethane foam material is mixed with aerogel insulation material, stirred evenly and then cured. The cured foam material is then cut into prefabricated foam boards.

[0011] The pre-foamed board is cut into strips of a pre-set shape;

[0012] Heat the preform mold to 35°C and lay glass fiber prepreg inside the preform mold;

[0013] Pre-formed foamed boards of a predetermined shape are spliced ​​and bonded to the periphery of the glass fiber prepreg.

[0014] The glass fiber prepreg is laid again on the periphery of the spliced ​​pre-foamed board and refrigerated at 10°C to obtain a preform.

[0015] The preform is placed in a molding mold, heated, and then the mold is closed. The glass fiber prepreg in the inner and outer layers is integrally formed with the pre-foamed board to obtain the lightweight heat-insulating battery box.

[0016] In a preferred embodiment of the present invention, the thickness of the pre-foamed board is between 10-15 mm;

[0017] The thickness of the glass fiber prepreg is between 3 and 5 mm.

[0018] This invention provides a lightweight thermal insulation battery box prefabrication system with a manufacturing process, comprising:

[0019] A foam board prefabrication device, which is used to prepare prefabricated foam boards and cut the prefabricated foam boards into strips of a predetermined shape;

[0020] A multi-line conveyor belt is located downstream of the foam board prefabrication device. The multi-line conveyor belt is provided with several interval conveyor lines. The interval conveyor lines are provided with installation points. The several installation points are connected to form a straight line of operation. Each interval conveyor line sequentially conveys the prefabricated foam boards of different shapes to the straight line of operation.

[0021] A drive arm is mounted on the multi-line conveyor belt. A pre-shaped mold is rotatably mounted on the drive arm. The pre-shaped mold rolls along the straight line of motion and its extension line and each surface contacts the mounting point in sequence during the rotation.

[0022] A prepreg laying device is installed on the side of the multi-line conveyor belt and conveys glass fiber prepreg to the extension line of the operating straight line;

[0023] In this process, when the preform mold moves to the prepreg laying device, the glass fiber prepreg is laid onto the preform mold. After laying, the preform mold continues to roll onto the multi-line conveyor belt, where the pre-formed foamed board is spliced ​​and bonded to the periphery of the glass fiber prepreg at the installation point. Finally, the preform mold returns to the prepreg laying device again, and the glass fiber prepreg is laid onto the periphery of the pre-formed foamed board to obtain a preform.

[0024] As a preferred embodiment of the present invention, the driving arm includes a limiting rod mounted on the multi-line conveyor belt and the prepreg laying device. The limiting rod is parallel to the movement line and is connected to the preform mold through a driving group. The driving group drives the preform mold to move on several of the interval conveyor lines and the prepreg laying device.

[0025] A rotary drive motor is provided between the drive group and the preform mold. When the preform mold is located on the prepreg laying device, the drive group stops moving. The rotary drive motor drives the preform mold to rotate one revolution and lays the glass fiber prepreg on the periphery of the preform mold. After the laying is completed, the drive group drives the preform mold to move to the position of the interval conveyor line and gradually rotates to bond the pre-foamed board on the installation point to the glass fiber prepreg in sequence. After the preform mold rotates one revolution, it rotates one revolution in the opposite direction and moves back to the prepreg laying device for secondary laying.

[0026] As a preferred embodiment of the present invention, the preform mold includes a heating frame and a strip-shaped notch disposed on the heating frame. The heating frame is connected to the rotation drive motor and rotates on the action line and its extension line under the drive of the rotation drive motor. When the heating frame continuously releases heat energy and fixes the edge of the glass fiber prepreg at the strip-shaped notch during the rotation process, the glass fiber prepreg gradually deforms during the heating process to fit against the periphery of the heating frame, making the glass fiber prepreg sticky.

[0027] In a preferred embodiment of the present invention, the multi-line conveyor belt includes a frame disposed downstream of the pre-foamed board prefabrication device, a conveyor belt disposed on the frame, and rotating wheels for driving the conveyor belt to move. The conveyor belt is provided with a plurality of placement slots for fixing the pre-foamed boards. The placement slots are disposed one-to-one on the interval conveyor lines. The placement slots closer to the prepreg laying device take less time to convey the pre-foamed boards on them to the installation position. When the farthest placement slot reaches the installation position, the heating frame rotates one full turn on the multi-line conveyor belt.

[0028] As a preferred embodiment of the present invention, it further includes a correction control device, which is installed above the action line and has a plurality of sensing strips, each of which corresponds one-to-one with the interval conveyor line.

[0029] The induction channel is equipped with a first transmitter and a second transmitter. The end of the placement slot is equipped with a first sensor, and the interior of the placement slot is equipped with a second sensor. When the induction laser emitted by any of the first transmitters is received by the first sensor but the corresponding second sensor does not receive the induction laser emitted by the second transmitter, the rotating wheel stops rotating until the heating frame removes the pre-foamed board from the placement slot. Then the second sensor receives the emitted laser, and the rotating wheel continues to rotate.

[0030] As a preferred embodiment of the present invention, the prepreg laying device includes a conveyor belt and a fixing groove disposed on the conveyor belt for fixing the glass fiber prepreg. The edge of the fixing groove is chamfered, and the edge of the glass fiber prepreg is disposed on the chamfer. When the fixing groove moves to the position of the extension line of the action line, the heating frame moves above the fixing groove, and the strip notch corresponds to the chamfer. The strip notch initially fixes the glass fiber prepreg located on the chamfer.

[0031] As a preferred embodiment of the present invention, a rotating wheel is movably mounted on the chamfer. When the heating frame moves the glass fiber prepreg, the rotating wheel rotates and applies pressure to the glass fiber prepreg toward the periphery of the heating frame.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] 1. The present invention sandwiches a foamed material between two layers of fiber-reinforced composite material. The foamed material and aerogel are used to make a thermal insulation foam material to achieve the thermal insulation effect. Compared with the general sandwich structure, this structure is simple.

[0034] 2. This invention adopts a pre-forming process and a cutting and then splicing method, which makes the foam material have a simple structure, not only reducing the waste of foam material, but also simplifying the precision when cutting the foam material, resulting in better product consistency.

[0035] 3. The preforming device provided by the present invention realizes the laying of fiber composite materials through the dual-line movement of the preforming mold and the conveying device and the splicing of multiple foam boards during the rotation and movement process. The whole process is automated, simple to operate and the action is continuous and uninterrupted. Attached Figure Description

[0036] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0037] Figure 1 A structural schematic diagram of a lightweight, heat-insulating battery box is provided for this invention;

[0038] Figure 2 This invention provides a partial structural enlarged view of the lightweight insulated battery box.

[0039] Figure 3 A schematic diagram of the side cut structure of the lightweight insulated battery box is provided for this invention;

[0040] Figure 4 A schematic diagram of the prefabrication system for the preparation process provided by the present invention;

[0041] Figure 5 For the present invention Figure 4 A partial side view of the drive arm and multi-line conveyor belt;

[0042] Figure 6 For the present invention Figure 4 A partial structural diagram of the front of the pre-formed mold;

[0043] Figure 7 For the present invention Figure 4 A top-view partial structural diagram of a multi-line conveyor belt;

[0044] Figure 8 For the present invention Figure 7 A partial structural diagram of the front of the prepreg laying device.

[0045] The labels in the diagram represent the following:

[0046] 1-Fiberglass inner panel; 2-Fiberglass outer panel; 3-Sandwich panel; 4-L-shaped corner; 5-Hanging point metal reinforcement;

[0047] 6-Foamed board prefabrication device; 7-Multi-line conveyor belt; 8-Drive arm; 9-Preform mold; 10-Interval conveyor line; 11-Prepreg laying device; 12-Correction control device; 13-Induction track; 14-First transmitter; 15-Second transmitter; 16-Second sensor; 17-Rotator; 18-First sensor;

[0048] 701-Frame; 702-Conveyor Belt; 703-Rotating Wheel; 704-Setting Slot;

[0049] 801 - Limit rod; 802 - Drive assembly; 803 - Rotation drive motor;

[0050] 901 - Heating frame; 902 - Strip-shaped notch;

[0051] 1101 - Conveyor belt; 1102 - Fixed groove; 1103 - Chamfer. Detailed Implementation

[0052] 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.

[0053] Because of the large weight of the metal casing in the existing technology, the energy density of the battery pack decreases. The metal casing also has poor heat insulation and heat preservation effects, especially in cold environments. The temperature inside the battery casing drops accordingly, increasing the energy required to maintain the internal temperature, resulting in wasted battery power and reduced range of new energy vehicles.

[0054] Secondly, the sound insulation and impact resistance of some battery boxes made of single materials cannot meet the requirements. Therefore, there is a need for a battery box that can improve the heat insulation, sound insulation and impact resistance.

[0055] like Figures 1 to 3 As shown, the present invention provides a lightweight thermal insulation battery box and its manufacturing process and prefabrication system, including a glass fiber inner panel 1 and a glass fiber outer panel 2 disposed around the glass fiber inner panel 1. A sandwich panel 3 is disposed between the glass fiber inner panel 1 and the glass fiber outer panel 2, and the sandwich panel 3 is made of prefabricated foam board.

[0056] The edges of the inner fiberglass panel 1 and the outer fiberglass panel 2 extend outward to form an L-shaped bend 4, which is fixedly connected by several hanging point metal reinforcements 5. The fiberglass reinforcement material, as the main structural component responsible for mechanical properties, is selected based on a comprehensive consideration of its mechanical properties and cost. The sandwich panel 3 is primarily responsible for thermal insulation. The mounting point metal reinforcements enhance the connection strength.

[0057] This invention proposes a sandwich structure for battery box housings. There are many materials on the market that use sandwich structures, but unlike ordinary sandwich materials, this structure is used for battery boxes. Its inner and outer layers are made of fiber-reinforced composite materials to ensure structural strength, and the middle layer is made of thermal insulation foam material made of foamed material and aerogel to achieve thermal insulation effect, while also having the advantages of sound insulation and vibration isolation.

[0058] To further improve the thermal insulation effect of the sandwich panel, the polyurethane foam used inside the sandwich panel has a foaming density of 3.0-5.0 kg / m³. 3 The foamed foam has a thickness of 10-15mm, and the inner and outer panel thicknesses are 2-5mm. Additionally, adding 10-100g of aerogel powder per square meter during the prefabrication of polyurethane foam boards can effectively improve thermal insulation performance.

[0059] Experiments have shown that battery boxes made with this sandwich material have 50-80% better thermal insulation performance and 10% better winter driving range. In addition to increasing strength, it can also achieve better noise reduction and energy absorption.

[0060] The conventional manufacturing process for sandwich structures involves first defining the shape of each layer and then assembling them. However, because the insulation foam material used in the middle layer, made of foamed material and aerogel, is easily broken and difficult to cut, it is not easy to shape it into a complex structure during production. This makes the assembly of materials quite challenging. Therefore, to solve the material assembly problem, this invention also provides a manufacturing process for a lightweight insulated battery box, including the following steps:

[0061] Polyurethane foam material is mixed with aerogel insulation material, stirred evenly and then cured. The cured foam material is then cut into prefabricated foam boards.

[0062] The pre-foamed board is cut into strips of a pre-set shape;

[0063] Heat the preform mold to 35°C and lay glass fiber prepreg inside the preform mold;

[0064] Pre-formed foamed boards of a predetermined shape are spliced ​​and bonded to the periphery of the glass fiber prepreg.

[0065] The glass fiber prepreg is laid again on the periphery of the spliced ​​pre-foamed board and refrigerated at 10°C to obtain a preform.

[0066] The preform is placed in a molding mold and heated and closed. The glass fiber prepreg in the inner and outer layers is integrally formed with the pre-foamed board (the process parameters are: mold temperature: 130℃~140℃; curing pressure adopts the expansion force of the foamed material after mold closing and the heat preservation time is 300-900S) to obtain the lightweight heat-insulating battery box.

[0067] All the molds can be made of steel, and the mold structure is designed according to the different molding processes.

[0068] In this process, the cured foam material is first cut into simple pre-formed foam boards with a thickness of 10-15mm. Then, a pre-forming mold is used for the first layering. When the 2-5mm glass fiber prepreg is heated and has a certain viscosity, the pre-formed foam board can be bonded to the glass fiber prepreg after the first layering. After all the pre-formed foam boards are spliced, the pre-forming mold performs the second layering, directly wrapping another layer of glass fiber prepreg around the outside of the pre-formed foam board. After cooling, a preform is obtained, and then the preform is integrally molded.

[0069] When preparing the inner core structure, a cutting and then splicing method is adopted, which gives the foam material a simple structure. This not only reduces the waste of foam material, but also simplifies the precision when cutting the foam material, resulting in better product consistency.

[0070] In actual production, the challenge of this process lies in how to splice the cut foamed material onto the preform mold, simplify the process flow, and improve the splicing accuracy. To address this, the present invention also provides a preform preparation system, namely a prefabrication system for the manufacturing process of lightweight insulated battery boxes.

[0071] like Figures 4 to 8 As shown, the present invention provides a prefabrication system for the manufacturing process of a lightweight thermally insulated battery box, comprising:

[0072] The foam board prefabrication device 6 is used to prepare prefabricated foam boards and cut them into strips of a predetermined shape.

[0073] A multi-line conveyor belt 7 is located downstream of the foam board prefabrication device 6. Several interval conveyor lines 10 are provided on the multi-line conveyor belt 7. Installation points are provided on the interval conveyor lines 10. Several installation points are connected to form a straight line of operation. Each interval conveyor line 10 sequentially conveys prefabricated foam boards of different shapes to the straight line of operation.

[0074] The drive arm 8 is mounted on the multi-line conveyor belt 7. A pre-formed mold 9 is rotatably mounted on the drive arm 8. The pre-formed mold 9 rolls along the straight line of motion and its extension line, and each surface contacts the installation point in turn during the rotation.

[0075] The prepreg laying device 11 is set on the side of the multi-line conveyor belt 7 and conveys the glass fiber prepreg to the extension line of the operating straight line.

[0076] In this process, when the preform mold 9 moves to the prepreg laying device 11, the glass fiber prepreg is laid onto the preform mold 9. After the laying is completed, the preform mold 9 continues to roll onto the multi-line conveyor belt 7, where the pre-formed foamed board is spliced ​​and bonded to the periphery of the glass fiber prepreg at the installation point. Finally, the preform mold 9 returns to the prepreg laying device 11 and the glass fiber prepreg is laid onto the periphery of the pre-formed foamed board again to obtain a preform.

[0077] This system completes the splicing and bonding of foamed sandwich materials through the reciprocating movement and rotation of the preform mold, and at the same time completes the fully automated laying of prepreg, realizing the fully automated preparation of preforms, and has a simple structure.

[0078] To further simplify the motion analysis of the movement of the preform mold 9, the drive arm 8 includes a limiting rod 801 mounted on the multi-line conveyor belt 7 and the prepreg laying device 11. The limiting rod 801 is parallel to the movement line and is connected to the preform mold 9 through the drive group 802. The drive group 802 can drive the preform mold 9 to move back and forth on several interval conveyor lines 10 and the prepreg laying device 11.

[0079] A rotary drive motor 803 is provided between the drive unit 802 and the preform mold 9. When the preform mold 9 is located on the prepreg laying device 11, the drive unit 802 stops moving, and the rotary drive motor 803 drives the preform mold 9 to rotate one revolution and lays the glass fiber prepreg around the periphery of the preform mold 9. At this time, the preform mold 9 is in a heated state.

[0080] After the laying is completed, the drive unit 802 drives the preform mold 9 to move to the position of the interval conveyor line 10 and gradually rotates to bond the pre-foamed boards on the installation point to the glass fiber prepreg in sequence. After the preform mold 9 rotates for one full turn, the sandwich layer is bonded. The preform mold 9 moves in the opposite direction to the position of the prepreg laying device 11 to carry out the secondary laying.

[0081] This invention achieves the laying and splicing actions by moving the pre-formed mold 9, eliminating the need for manual splicing by workers, and the operation is simple and can be carried out continuously.

[0082] If the multi-line conveyor belt 7, which transports the pre-molded foam board, is in a waiting state during the movement of the pre-molded mold 9, it will cause a waste of production time. Therefore, it is necessary to limit the conveying process of the multi-line conveyor belt 7 according to the time difference of splicing of each surface during the rotation of the pre-molded mold 9.

[0083] The multi-line conveyor belt 7 includes a frame 701 located downstream of the foam board prefabrication device 6, a conveyor belt 702 mounted on the frame 701, and a rotating wheel 703 that drives the conveyor belt 702 to move. The conveyor belt 702 is provided with several placement slots 704 for fixing the prefabricated foam boards. The placement slots 704 are arranged one-to-one on the interval conveyor line 10. The placement slot 704 that is closer to the prepreg laying device 11 takes less time to transport the prefabricated foam board on it to the installation point. When the farthest placement slot 704 reaches the installation point, the heating frame 901 rotates one full turn on the multi-line conveyor belt 7.

[0084] As the preform mold 9 moves continuously, the placement groove 704 transports the corresponding pre-made foamed board to the position where the preform mold 9 will move. After the preform mold 9 moves, the next cycle of splicing production begins, reducing the waiting time of the placement groove 704 when the preform mold 9 moves, and reducing the total production time.

[0085] Due to mechanized production, the preform mold 9 and the multi-line conveyor belt 7 move simultaneously, which can lead to accuracy issues. In order to prevent errors during the movement and improve the splicing accuracy, a correction control device 12 is also included. The correction control device 12 is installed above the moving straight line and has several sensing strips 13. Each sensing strip 13 corresponds one-to-one with the interval conveyor line 10.

[0086] A first transmitter 14 and a second transmitter 15 are provided on the sensing strip 13. A first sensor 18 is provided at the end of the placement groove 704, and a second sensor 16 is provided inside the placement groove 704. When the sensing laser emitted by any of the first transmitters 14 is received by the first sensor 18, but the corresponding second sensor 16 does not receive the sensing laser emitted by the second transmitter 15, the rotating wheel 703 stops rotating until the heating frame 901 removes the pre-made foamed board from the placement groove 704, the second sensor 16 receives the emitted laser, and the rotating wheel 703 continues to rotate.

[0087] Since the laying of prepreg requires a certain degree of processing and fixing of the prepreg, in order to better complete the laying action, the preform mold 9 includes a heating frame 901 and a strip notch 902 set on the heating frame 901. The heating frame 901 is connected to the rotation drive motor 803 and rotates on the action line and its extension line under the drive of the rotation drive motor 803. When the heating frame 901 continuously releases heat energy and fixes the edge of the glass fiber prepreg at the strip notch 902 during the rotation process, the glass fiber prepreg gradually deforms during the heating process to fit with the periphery of the heating frame 901, and makes the glass fiber prepreg sticky.

[0088] The prepreg laying device 11 includes a conveyor belt 1101 and a fixing groove 1102 disposed on the conveyor belt 1101 for fixing glass fiber prepreg. The edge of the fixing groove 1102 is provided with a chamfer 1103, and the edge of the glass fiber prepreg is disposed on the chamfer 1103. When the fixing groove 1102 moves to the position of the extension line of the action line, the heating frame 901 moves above the fixing groove 1102, and the strip notch 902 corresponds to the chamfer 1103. The strip notch 902 initially fixes the glass fiber prepreg located on the chamfer 1103.

[0089] In order to make the glass fiber prepreg fit more closely to the periphery of the preform mold 9, a rotating wheel 17 is movably installed on the chamfer 1103. When the heating frame 901 moves the glass fiber prepreg, the rotating wheel 17 rotates and applies pressure to the glass fiber prepreg toward the periphery of the heating frame 901.

[0090] The lightweight insulated battery box and its manufacturing process and prefabrication system in this embodiment can improve the insulation and impact resistance of the box through the foam sandwich structure and the inner and outer rigid structures. At the same time, the pre-forming process of foam material allows the foam material to be better shaped between the inner and outer rigid materials, thereby improving product consistency. In addition, the pre-forming system with uninterrupted processing between prepreg laying and foam splicing simplifies the manufacturing process and realizes fully automated operation.

[0091] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A preparation process of a lightweight thermal insulation battery box, the lightweight thermal insulation battery box comprising a glass fiber inner panel (1) and a glass fiber outer panel (2) arranged on the side of the glass fiber inner panel (1), a sandwich panel (3) is arranged between the glass fiber inner panel (1) and the glass fiber outer panel (2), and the sandwich panel (3) is made of a prefabricated foamed panel; edges of the glass fiber inner panel (1) and the glass fiber outer panel (2) extend outward and form L-shaped corners (4), and the L-shaped corners (4) are fixedly connected through a plurality of hanging point metal reinforcing members (5); the preparation process comprises the following steps: mixing polyurethane foaming material and aerogel thermal insulation material, stirring uniformly, solidifying, cutting the solidified foaming material into a prefabricated foamed panel, cutting the prefabricated foamed panel into a strip with a preset shape, heating a preform mold to 35℃, laying glass fiber prepreg in the preform mold, splicing and bonding the prefabricated foamed panel with the preset shape on the side of the glass fiber prepreg, laying the glass fiber prepreg again on the side of the spliced prefabricated foamed panel, and refrigerating at 10℃ to obtain a preform; and placing the preform into a forming mold, heating and closing the mold, and integrally forming the glass fiber prepreg on the inner and outer layers with the prefabricated foamed panel to obtain the lightweight thermal insulation battery box. The thickness of the prefabricated foamed panel is between 10-15mm; and the thickness of the glass fiber prepreg is between 3-5mm. characterized in that The preparation process comprises the following steps: a foamed panel prefabricating device (6) is used to prepare a prefabricated foamed panel and cut the prefabricated foamed panel into a strip with a preset shape; a multi-line conveying belt (7) is arranged downstream of the foamed panel prefabricating device (6), a plurality of interval conveying lines (10) are arranged on the multi-line conveying belt (7), a plurality of installation sites are arranged on the interval conveying lines (10), the installation sites are connected to form a moving straight line, and each interval conveying line (10) sequentially conveys the prefabricated foamed panel with different shapes to the moving straight line; a driving arm (8) is arranged on the multi-line conveying belt (7), a preform mold (9) is rotatably arranged on the driving arm (8), and the preform mold (9) rolls on the moving straight line and its extension line and sequentially contacts each face with the installation sites during rotation; a prepreg laying device (11) is arranged on the side of the multi-line conveying belt (7) and conveys glass fiber prepreg to the extension line of the moving straight line; and when the preform mold (9) moves to the prepreg laying device (11), the glass fiber prepreg is laid on the preform mold (9), and after laying is completed, the preform mold (9) continuously rolls to the multi-line conveying belt (7) to splice and bond the prefabricated foamed panel moved to the installation sites to the side of the glass fiber prepreg, and the preform mold (9) finally returns to the prepreg laying device (11) again to lay the glass fiber prepreg on the side of the prefabricated foamed panel again to obtain a preform. ​ ​ ​ ​ ​ ​ 2. The manufacturing process according to claim 1, characterized in that, ​ ​ 3. A lightweight thermal battery case pre-system prepared according to the process of any one of claims 1-2, characterized in that, ​ ​ ​ ​ ​ ​ 4. The prefabrication system of claim 3, wherein the driving arm (8) comprises a limiting rod (801) arranged on the multi-line conveying belt (7) and the prepreg laying device (11), the limiting rod (801) is parallel to the action straight line and is connected with the preform mold (9) through a driving group (802), the driving group (802) drives the preform mold (9) to move on the plurality of interval conveying lines (10) and the prepreg laying device (11). The driving group (802) and the preform mold (9) are provided with a rotating driving motor (803), when the preform mold (9) is located on the prepreg laying device (11), the driving group (802) stops moving, the rotating driving motor (803) drives the preform mold (9) to rotate one circle and rotates the glass fiber prepreg to the side of the preform mold (9), after the laying is completed, the driving group (802) drives the preform mold (9) to move to the interval conveying line (10) position and gradually rotates to sequentially bond the prefabricated foam plates on the glass fiber prepreg on the mounting site. After the preform mold (9) rotates one circle and reversely rotates one circle and moves back to the prepreg laying device (11) to lay again.

5. The prefabrication system of claim 4, wherein the preform mold (9) comprises a heating frame (901) and a strip-shaped notch (902) arranged on the heating frame (901), the heating frame (901) is connected with the rotating driving motor (803) and rotates on the action straight line and its extension line under the driving of the rotating driving motor (803). When the heating frame (901) continuously releases heat energy and fixes the edge of the glass fiber prepreg at the strip-shaped notch (902) in the rotating process, the glass fiber prepreg gradually deforms to fit the side of the heating frame (901) in the heating process, and the glass fiber prepreg has adhesion.

6. The prefabrication system of claim 5, wherein the multi-line conveying belt (7) comprises a frame (701) arranged downstream of the foam plate prefabrication device (6), a conveying belt (702) arranged on the frame (701), and a rotating wheel body (703) driving the conveying belt (702) to move, the conveying belt (702) is provided with a plurality of arrangement grooves (704) for fixing the prefabricated foam plates, and the arrangement grooves (704) are arranged one by one on the interval conveying lines (10). The closer the arrangement grooves (704) to the prepreg laying device (11), the shorter the time for the prefabricated foam plates on the arrangement grooves (704) to be conveyed to the mounting site, when the farthest arrangement groove (704) reaches the mounting site, the rotating angle of the heating frame (901) on the multi-line conveying belt (7) is one circle. ​ ​ ​ 7. The pre-fabrication system of a light-weight thermal-insulated battery box according to claim 6, wherein, The correction control device (12) is installed above the action straight line, and a plurality of induction tracks (13) are arranged on the correction control device (12), each of the induction tracks (13) corresponding to the interval conveying line (10) one by one. The first emitter (14) and the second emitter (15) are arranged on the induction track (13), the end of the accommodation groove (704) is provided with the first inductor (18), and the inside of the accommodation groove (704) is provided with the second inductor (16). When the induction laser emitted by any one of the first emitters (14) is received by the first inductor (18) and the second inductor (16) matched with the first inductor (18) does not receive the induction laser emitted by the second emitter (15), the rotating wheel body (703) stops rotating until the heating frame body (901) takes out the prefabricated foamed plate in the accommodation groove (704), the second inductor (16) receives the emitted laser, and the rotating wheel body (703) continues to rotate.

8. The prefabricated system of the light-weight thermal battery box according to claim 5, wherein, The prepreg laying device (11) comprises a conveying belt (1101) and a fixing groove (1102) arranged on the conveying belt (1101) and used for fixing the glass fiber prepreg, and the edge of the fixing groove (1102) is provided with a chamfer (1103), and the edge of the glass fiber prepreg is arranged on the chamfer (1103); When the fixing groove (1102) moves to the extended line position of the action straight line, the heating frame body (901) moves above the fixing groove (1102), and the strip-shaped notch (902) corresponds to the chamfer (1103), and the strip-shaped notch (902) preliminarily fixes the glass fiber prepreg located on the chamfer (1103).

9. The prefabricated system of the light-weight thermal battery box according to claim 8, wherein, The rotating wheel (17) is movably arranged on the chamfer (1103), and when the heating frame body (901) moves the glass fiber prepreg, the rotating wheel (17) rotates and applies pressure to the glass fiber prepreg towards the side of the heating frame body (901).

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