Forming process for lower tray for vehicle batteries

Abstract

Disclosed in the present invention is a forming process for a lower tray for vehicle batteries. The forming process comprises the following steps: preparing a pultruded beam, wherein a resin-based composite material is pultruded by means of a pultrusion device to form a hollow pultruded beam; assembling a frame, wherein the prepared hollow pultruded beam is cut into a plurality of profiles, which are then combined and assembled into a frame by means of tooling; and performing wrapping and layering, wherein the frame is wrapped and layered with a resin-based composite material prepreg sheet. The tray provided in the present invention is structurally integrally formed by means of a wrapping layer, and a welding step is omitted, thereby preventing potential defects caused by welding, achieving a seamless integrated structure, significantly enhancing the sealing performance, and improving the overall product quality. In addition, the tray has a high lightweighting degree, and on the premise of maintaining the same volume, a composite material of a hollow tubular beam structure is used, thereby achieving an effect of a weight reduction by up to 50% compared with a conventional aluminum tray.

Description

A molding process for a lower tray of an automotive battery Technical Field

[0001] This invention relates to the field of battery lower tray manufacturing technology, and specifically to a molding process for an automotive battery lower tray. Background Technology

[0002] Electric vehicles have solved the energy crisis and environmental pollution, and lightweighting and low cost are currently important directions for their development. The battery is a crucial component of an electric vehicle, and it is mounted and secured using a battery tray.

[0003] Currently, battery trays for new energy vehicles on the market are typically made of high-strength steel or aluminum alloy. Compared to die casting and stamping of high-strength steel, aluminum extrusion into profiles followed by welding is the mainstream process for battery boxes. This method, which uses profile splicing and processing to meet different needs, offers advantages such as flexible design, convenient processing, and ease of modification. In terms of performance, extruded aluminum alloy battery trays possess high rigidity, vibration resistance, compression resistance, and impact resistance. Furthermore, the density of the high-strength steel used is typically around 7.5 g / cm³. 3 The density of the aluminum alloy used is typically 2.75 g / cm³. 3 Aluminum alloys are lighter, so they are gradually replacing high-strength steel as the main material for manufacturing battery trays.

[0004] However, the lower tray made of aluminum alloy still cannot meet the current requirements for lightweight battery trays in new energy vehicles. Furthermore, after aluminum is extruded into profiles, the profiles still need to be spliced ​​together by welding. Traditional fusion welding can cause problems such as material deformation, porosity, and low weld joint coefficient due to high heat input, which affects the flatness and precision of the final battery box and thus affects the installation of the battery.

[0005] Summary of the Invention

[0006] The purpose of this invention is to provide a molding process for a lower tray of an automotive battery, in order to solve the technical problems of low lightweighting of the lower tray manufactured by the existing lower tray manufacturing process, and the fact that the required welding steps easily lead to low flatness and precision of the lower tray.

[0007] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0008] A molding process for a lower tray of an automotive battery includes the following steps:

[0009] The frame is prepared by pultruding the resin-based composite material into hollow pultruded beams using a pultrusion device. The hollow pultruded beams are then cut to form multiple profiles, which are then assembled and spliced ​​together using tooling to form the frame.

[0010] The coating layer is a resin-based composite prepreg sheet that is coated onto the outer surface of the frame and the grooves formed inside it.

[0011] The prepreg of resin-based composite material after the above-mentioned layup is integrally molded by hot pressing and curing with a press and a mold. This forms a coating layer on the outer surface of the frame and in the grooves formed inside. Multiple profiles on the frame are fixed and connected only through the coating layer, thus achieving integral molding of the frame and the coating layer and obtaining a seamless integrated lower tray.

[0012] Furthermore, the resin in the resin-based composite material is a thermosetting resin-based resin, and the reinforcing material in the resin-based composite material is glass fiber;

[0013] The glass fiber is a unidirectional bundle of glass fiber.

[0014] In the above-mentioned coating and layering process, the thickness of the resin-based composite prepreg sheet is between 1.5-4.5 mm, and the continuity of the fibers in the prepreg sheet is maintained;

[0015] When prepreg sheets overlap, the overlap distance is greater than 300mm.

[0016] Furthermore, the hollow pultruded beam has multiple reinforcing ribs inside, which creates multiple hollow grooves inside the profile.

[0017] Furthermore, the multiple profiles prepared above are spliced ​​together by snap-fit ​​to form the frame of the lower tray.

[0018] Furthermore, the profile obtained by cutting the hollow pultruded beam includes multiple first support beams, second support beams, first reinforcing beams, and second reinforcing beams;

[0019] The second support beam has notches at both ends near the first support beam, so that baffles remain on one side of the notches at both ends of the second support beam, and the baffles match the vertical section of the first support beam.

[0020] Furthermore, the specific steps for assembling and splicing two first support beams, two second support beams, at least one first reinforcing beam, and at least one second reinforcing beam to form a frame using tooling are as follows:

[0021] Place the second reinforcing beam onto the fixture and fix it in place;

[0022] The first reinforcing beam and the second reinforcing beam are connected by a snap-fit ​​mechanism.

[0023] The first support beam is moved towards the first reinforcing beam by the power mechanism on the tooling, and the first support beam is positioned and a layer of structural adhesive is applied to both sides of the first support beam.

[0024] The second support beam is moved toward the first reinforcing beam by the power mechanism on the tooling, and the second support beam is positioned so that the baffles on both sides of the second support beam are fixedly connected to the two sides of the first support beam by structural adhesive.

[0025] Furthermore, the molds used in the one-piece molding process are all provided with draft angles, and the angle of the draft angle is ≥1.5°;

[0026] When the profiles are spliced ​​to form a frame, the joints between adjacent profiles are covered by sequential stacking to meet the unequal thickness requirements of the draft angle. Specifically:

[0027] The prepreg sheets are laid by stacking them at different heights on the side facade.

[0028] The edges of each layer of plywood are cut according to the draft angle, and small patches are used to fill and reinforce the cut gaps or uncovered areas.

[0029] Furthermore, the tooling structure used to assemble the frame includes a base plate, on the top of which is a placement groove for placing the second reinforcing beam, and a placement plate is slidably connected inside the placement groove.

[0030] A set of first positioning components is fixedly connected to both sides of the top of the base plate. Each set of first positioning components includes two positioning plates and a first push plate. The first push plate is disposed between the two positioning plates, and the end of the positioning plate near the placement groove is inclined towards the first push plate.

[0031] Two sets of symmetrically arranged second positioning components are provided between the two sets of first positioning components. Each set of second positioning components includes two extrusion plates and a second push plate disposed between the two extrusion plates, and the extrusion plate is inclined towards the second push plate at the end near the placement groove.

[0032] The first push plate is provided with a power mechanism on the side away from the placement groove, the second push plate is provided with a power mechanism on the side away from the placement groove, and the bottom of the placement plate, so that the first push plate and the second push plate move towards the placement groove, and the placement plate moves up and down.

[0033] The extrusion plate has a cylinder containing glue on the side away from the second push plate. A roller rotatably connected to the bottom plate is provided on the side of the extrusion plate near the placement groove. A dispensing nozzle is provided between the cylinder and the roller. When the second push plate pushes the first support beam to move towards the placement groove, the end of the first support beam squeezes the extrusion plate, thereby causing the extrusion plate to squeeze the cylinder and deform it. This causes the glue inside the cylinder to be squeezed out from the dispensing nozzle and applied to the roller. As the first support beam moves, it drives the roller to rotate, transferring the glue on the roller to both ends of the first support beam.

[0034] Furthermore, the height of the liquid outlet is less than or equal to the height of the roller, and the height of the liquid outlet is greater than or equal to the height of the first support beam;

[0035] The shortest distance between each set of positioning plates is equal to the length of the second support beam;

[0036] The shortest distance between each set of extrusion plates is less than the length of the first support beam;

[0037] The extrusion plate is fixedly connected to an extrusion block on the side near the cylinder, and a vertical plate is fixedly connected to the bottom plate on the side of the cylinder away from the extrusion plate. A sliding rod is fixedly connected to the side of the extrusion plate near the vertical plate, and the sliding rod is slidably connected to the vertical plate.

[0038] A first spring is fixedly connected between the extrusion plate and the upright plate, so that the extrusion plate returns to its original position under the rebound force of the first spring.

[0039] Furthermore, the slide bar passes through the vertical plate and extends, and a push rod is provided on the side of the roller near the liquid outlet. The push rod is arranged parallel to the slide bar, and the push rod and the slide bar are fixedly connected by a connecting rod.

[0040] The push rod is fixedly connected to a second spring at one end near the drum. When the extrusion plate is extruded and moves toward the cylinder, the push rod moves away from the drum via the slide rod. When the extrusion plate loses its extrusion force, under the rebound force of the first spring, the second spring on the push rod moves toward the drum via the slide rod, causing the drum to rotate and turn the glued side toward the first support beam.

[0041] The distance between the end of the roller and the extrusion plate is greater than the width of the first support beam.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] The pallet forming process provided by this invention adopts a straight-up-down structure when splicing profiles, using only slots to ensure positional accuracy and splicing stability. After splicing, it is integrally formed through a covering layer, overcoming the potential defects brought about by conventional welding. Furthermore, the gaps at the splicing joints are filled with prepreg sheets to improve the integrity of the overall structure. Its structure uses lightweight materials such as resin-based composite materials, and while maintaining the same volume, it has a significant weight reduction effect compared to traditional aluminum pallets. Attached Figure Description

[0044] 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.

[0045] Figure 1 is a schematic diagram of the overall structure of the lower tray in this invention;

[0046] Figure 2 is a schematic diagram of the structure of the lower tray after the covering layer is removed in this invention;

[0047] Figure 3 is an exploded view of the frame in this invention;

[0048] Figure 4 is a schematic diagram of the structure of the second support beam in this invention;

[0049] Figure 5 is a schematic diagram of the tooling structure in this invention;

[0050] Figure 6 is a schematic diagram of the connection structure between the extrusion plate and the cylinder in this invention.

[0051] The labels in the diagram represent the following:

[0052] 01-First support beam; 02-Second support beam; 03-Frame; 04-Groove; 05-First reinforcing beam; 06-Second reinforcing beam; 07-Frame; 08-Covering layer; 09-Hollow groove; 010-Reinforcing rib; 011-Notch; 012-Baffle; 013-Slot;

[0053] 1-Base plate; 2-Placement groove; 3-Placement plate; 4-Positioning plate; 5-First push plate; 6-Squeezing plate; 7-Second push plate; 8-Cylinder; 9-Roller; 10-Discharge nozzle; 11-Squeezing block; 12-Upright plate; 13-Slide rod; 14-First spring; 15-Push rod; 16-Second spring. Detailed Implementation

[0054] 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.

[0055] As shown in Figures 1 to 6, the present invention provides a molding process for a lower tray of an automotive battery, comprising the following steps:

[0056] Frame preparation: Resin-based composite materials are pultruded and assembled using a pultrusion device to obtain a frame;

[0057] The coating layer is a resin-based composite prepreg sheet that is coated onto the outer surface of the frame and the grooves formed inside it.

[0058] The frame and ply are integrally molded using a weld-free fixing method to form a seamless, integrated lower tray.

[0059] Specifically, the molding process is as follows:

[0060] Frame 07 is prepared by pultruding resin-based composite material into hollow pultruded beams using a pultrusion device, cutting the hollow pultruded beams to form multiple profiles, and then assembling and splicing the multiple profiles using tooling to form frame 07.

[0061] The coating layer is a resin-based composite prepreg sheet that is coated onto the outer surface of the frame 07 and the groove formed therein.

[0062] The prepreg sheet of resin-based composite material after the above-mentioned layup is integrally molded by hot pressing and curing through a press and a mold, so that a covering layer 08 is formed on the outer surface of the frame 07 and the groove formed inside it. Multiple profiles on the frame are fixed and connected only through the covering layer 08, realizing the integral molding of the frame 07 and the covering layer 08, and obtaining a seamless integrated lower tray.

[0063] Composite materials are currently an emerging materials market. They exhibit excellent performance in environmental tests such as high temperature and humidity, temperature shock, low temperature dry state, and high temperature and humidity. Furthermore, they are virtually unaffected by salt spray, electrolytes, engine oil, acidic environments, and alkaline environments. Metallic materials, on the other hand, struggle to maintain their original state unaffected in corrosion and aging resistance tests. Therefore, while there are existing technologies researching the production of lower pallets using composite materials, these methods have practical limitations and have not yet achieved widespread adoption. For example:

[0064] 1. The lower tray, which is integrally molded from composite materials using the SMC process, has the defects of poor overall mechanical properties and low lightweighting.

[0065] 2. The lower tray, which is made of steel frame and composite material, has defects such as heavy overall weight, complicated process and poor electrical performance.

[0066] Therefore, using emerging composite materials to produce high-performance lower pallets has become a current research challenge.

[0067] The tray provided by this embodiment is integrally formed through the coating layer 08 in terms of structure, eliminating the welding step, thus avoiding potential defects caused by welding, achieving a seamless integrated structure, significantly enhancing the sealing performance, improving the overall quality of the product, and having a high degree of lightweight. Using a composite material with a hollow tube beam structure while maintaining the same volume, compared with the traditional aluminum tray, a weight reduction effect of up to 50% is achieved.

[0068] The sealing of the lower tray is to ensure the safe use of the battery pack, prevent the intrusion of external substances and the leakage of internal current. The sealing performance of the battery pack directly affects the safety of the battery system operation, and thus also affects the use safety of the whole vehicle. The lower tray prepared by this process is integrally formed without welding seams, and there will be no air holes. The surface of the molded integrated forming can ensure a smooth surface. Coupled with a high-precision machining method, the battery box and the sealing strip structure can be perfectly combined, ensuring the safety of the battery pack and improving the service life.

[0069] The resin in the resin-based composite material is a thermosetting resin-based resin, and the reinforcing material in the resin-based composite material is glass fiber;

[0070] The glass fiber is a unidirectional filament glass fiber.

[0071] In the above-mentioned coating and laying process, the thickness of the resin-based composite material prepreg sheet is between 1.5 - 4.5 mm, and the continuity of the fibers in the prepreg sheet is retained;

[0072] When there is an overlap in the prepreg sheet, the overlap distance is greater than 300 mm.

[0073] The unidirectional filament can effectively transfer and disperse stress, significantly improving the strength and stiffness of the material in the load direction.

[0074] The curing temperature of the resin-based composite material prepreg sheet after laying is 140 - 155 °C, and the curing time is 360 - 480 s.

[0075] The draft angle of the mold is ≥1.5°, and the mold temperature is: 130 °C - 170 °C; the mold pressure is selected according to the projected area of the mold. The specific mold pressure is calculated according to the formula T = S * F1 * F2 / F table, where T represents: the tonnage of the press; S represents: the horizontal projected area of the product; F1 represents: the required unit pressure of the product; F2 represents: the rated gauge pressure of the press; F table represents: the molding pressure, i.e., the gauge pressure.

[0076] A plurality of reinforcing ribs 010 are provided inside the hollow pultruded beam, forming a plurality of hollow grooves 09 inside the profile.

[0077] The plurality of profiles prepared above are spliced and combined by a clamping method to form the frame of the lower tray.

[0078] The profiles obtained by cutting the hollow pultruded beams mentioned above include multiple first support beams 01, second support beams 02, first reinforcing beams 05, and second reinforcing beams 06;

[0079] The second support beam 02 has notches 011 at both ends near the first support beam 01, so that baffles 012 remain on one side of the notches 011 at both ends of the second support beam 02, so that the baffles 012 match the vertical section of the first support beam 01.

[0080] Both the first reinforcing beam 05 and the second reinforcing beam 06 have slots 013 at their contact points, so that the first reinforcing beam 05 and the second reinforcing beam 06 are locked in place by the slots 013.

[0081] To reduce errors and improve the flatness and accuracy of the finished product tray, there is no fixed limiting structure between the reinforcing beam and the support beam; they are fixed only by layup.

[0082] When the profiles are spliced ​​to form a frame, the joints between adjacent profiles are covered by sequential stacking to meet the unequal thickness requirements of the draft angle. Specifically:

[0083] The prepreg sheets are laid by stacking them at different heights on the side facade.

[0084] The edges of each layer of plywood are cut according to the draft angle, and small patches are used to fill and reinforce the cut gaps or uncovered areas.

[0085] Since there is no fixed limiting structure between the reinforcing beam and the supporting beam, tooling is required for positioning and assembly to ensure that the lower pallet frame 07 has a certain stability so that it will not fall apart in subsequent layering processes.

[0086] The two first support beams 01, two second support beams 02, at least one first reinforcing beam 05 and at least one second reinforcing beam 06 are assembled and spliced ​​together by tooling to form a frame 07;

[0087] Specifically, the two first support beams 01 inside the frame 07 are arranged in parallel, and the two second support beams 02 are arranged in parallel, so that the two first support beams 01 and the two second support beams 02 together form a square frame 03, and a groove 04 is formed inside the frame 03. At the same time, the first reinforcing beam 05 and the second reinforcing beam 06 are confined inside the frame 03, and the first reinforcing beam 05 and the second reinforcing beam 06 are arranged perpendicularly.

[0088] The specific steps for assembling and splicing two first support beams 01, two second support beams 02, at least one first reinforcing beam 05, and at least one second reinforcing beam 06 to form frame 07 using tooling are as follows:

[0089] Place the second reinforcing beam 06 onto the fixture and fix it in place;

[0090] Connect the slot 013 on the first reinforcing beam 05 to the slot 013 on the second reinforcing beam 06, so that the first reinforcing beam 05 and the second reinforcing beam 06 are connected.

[0091] The first support beam 01 is moved towards the first reinforcing beam 05 by the power mechanism on the tooling, and the first support beam 01 is positioned at the same time, and a layer of structural adhesive is applied to both sides of the first support beam 01.

[0092] The second support beam 02 is moved towards the first reinforcing beam 05 by the power mechanism on the tooling, and the second support beam 02 is positioned, so that the baffles 012 on both sides of the second support beam 02 are fixedly connected to the two sides of the first support beam 01 by structural adhesive.

[0093] The tooling structure used to assemble the frame 07 includes a base plate 1, and a placement groove 2 for placing the second reinforcing beam 06 is provided on the top of the base plate 1. A placement plate 3 is slidably connected inside the placement groove 2.

[0094] A set of first positioning components is fixedly connected to both sides of the top of the base plate 1. Each set of first positioning components includes two positioning plates 4 and a first push plate 5. The first push plate 5 is disposed between the two positioning plates 4, and the end of the positioning plate 4 near the placement groove 2 is inclined towards the first push plate 5.

[0095] Two sets of symmetrically arranged second positioning components are provided between the two sets of first positioning components. Each set of second positioning components includes two extrusion plates 6 and a second push plate 7 disposed between the two extrusion plates 6, and the extrusion plate 6 is inclined towards the second push plate 7 at the end near the placement groove 2.

[0096] The first push plate 5 is located on the side away from the placement groove 2, the second push plate 7 is located on the side away from the placement groove 2, and the bottom of the placement plate 3 are all equipped with a power mechanism, so that the first push plate 5 and the second push plate 7 move towards the placement groove 2, and the placement plate 3 moves up and down.

[0097] The extrusion plate 6 has a cylinder 8 containing glue on the side away from the second push plate 7. A roller 9 rotatably connected to the bottom plate 1 is provided on the side of the extrusion plate 6 near the placement groove 2. A dispensing nozzle 10 is provided between the cylinder 8 and the roller 9. When the second push plate 7 pushes the first support beam 01 to move towards the placement groove 2, the end of the first support beam 01 squeezes the extrusion plate 6, thereby causing the extrusion plate 6 to squeeze the cylinder 8 and deform it, thereby squeezing the glue inside the cylinder 8 out of the dispensing nozzle 10 and applying it to the roller 9. As the first support beam 01 moves, it drives the roller 9 to rotate, transferring the glue on the roller 9 to both ends of the first support beam 01.

[0098] Installing the frame 07 using tooling is more time-saving and labor-saving, and has a smaller error. First, place the second reinforcing beam 06 inside the placement groove 2, and then push the second support beam 02 and the first support beam 01 through the first push plate 5 and the second push plate 7. Apply glue to both ends of the first support beam 01 through the roller 9. The extrusion plate 6 not only limits the movement of the first support beam 01, but also extrudes the cylinder 8 to apply glue to the roller 9.

[0099] By pushing and squeezing the first push plate 5 and the second push plate 7, the second support beam 02 and the first support beam 01 are temporarily fixed by the glue on both ends of the first support beam 01, which facilitates subsequent movement and subsequent hot pressing to maintain the frame shape.

[0100] The height of the liquid outlet 10 is less than or equal to the height of the roller 9, and the height of the liquid outlet 10 is greater than or equal to the height of the first support beam 01.

[0101] The shortest distance between each group of positioning plates 4 is equal to the length of the second support beam 02;

[0102] The shortest distance between each set of extrusion plates 6 is less than the length of the first support beam 01;

[0103] Among them, the extrusion plate 6 is fixedly connected to the extrusion block 11 on the side near the cylinder 8, and the cylinder 8 is provided with a vertical plate 12 fixedly connected to the bottom plate 1 on the side away from the extrusion plate 6. The extrusion plate 6 is fixedly connected to the sliding rod 13 on the side near the vertical plate 12, and the sliding rod 13 is slidably connected to the vertical plate 12.

[0104] A first spring 14 is fixedly connected between the extrusion plate 6 and the upright plate 12, so that the extrusion plate 6 returns to its original position under the rebound force of the first spring 14.

[0105] The slide bar 13 passes through the vertical plate 12 and extends. A push rod 15 is provided on the side of the roller 9 near the liquid outlet 10. The push rod 15 is arranged parallel to the slide bar 13. The push rod 15 and the slide bar 13 are fixedly connected by a connecting rod.

[0106] The push rod 15 is fixedly connected to a second spring 16 near the end of the roller 9. When the extrusion plate 6 is extruded and moves toward the cylinder 8, the push rod 15 moves away from the roller 9 through the slide rod 13. When the extrusion plate 6 loses its extrusion force, under the rebound force of the first spring 14, the second spring 16 on the push rod 15 moves toward the roller 9 through the slide rod 13, causing the roller 9 to rotate and turn the glued side toward the first support beam 01.

[0107] The distance between the end of the roller 9 and the extrusion plate 6 is greater than the width of the first support beam 01.

[0108] To prevent the adhesive from drying, when the first support beam 01 moves to one side of the roller 9, it loses contact with the extrusion plate 6. Due to the rebound force of the first spring 14, the connecting rod pushes the roller 9 to rotate, so that the side with adhesive just moves to the side of the first support beam 01. The power mechanism can be a hydraulic rod or a telescopic rod.

[0109] 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 process for forming a tray under a battery of an automobile as claimed in claim 1, wherein, The method comprises the following steps: Frame preparation: resin-based composite material is formed into a hollow pultrusion beam through a pultrusion device, the hollow pultrusion beam is cut to form multiple profiles, and the multiple profiles are combined and spliced to form a frame through a tool; Coating layer: resin-based composite material prepreg is coated on the outer surface of the frame and the recess formed inside the frame; One-piece forming: resin-based composite material prepreg after coating is cured and formed into one piece through a press and a mold, so that a coating layer is formed in the recess formed inside the frame and on the outer surface of the frame, the multiple profiles on the frame are fixed and connected only through the coating layer, one-piece forming of the frame and the coating layer is achieved, and a seamless integrated lower tray is obtained.

2. A process for forming a tray under a battery of an automobile as claimed in claim 1, wherein, The resin in the resin-based composite material is a thermosetting resin-based resin, and the reinforcing material in the resin-based composite material is glass fiber; The glass fiber is unidirectional glass fiber. In the coating layer process, the thickness of the resin-based composite material prepreg is between 1.5-4.5mm, and the continuity of the fibers in the prepreg is maintained. When the prepreg is overlapped, the overlapping distance is greater than 300mm.

3. A process for forming a tray under a battery of an automobile as claimed in claim 2, wherein, The hollow pultrusion beam is provided with multiple reinforcing ribs, so that multiple hollow grooves are formed in the profiles.

4. A process for forming a tray under a battery of an automobile as claimed in claim 3, wherein, The multiple profiles are combined and spliced to form the frame of the lower tray through clamping.

5. A process for forming a tray under a battery of an automobile as claimed in claim 4, wherein, The profile comprises multiple first support beams, multiple second support beams, multiple first reinforcing beams, and multiple second reinforcing beams. The second support beam is provided with a notch at each end near the side of the first support beam, so that a baffle is left on one side of the notch at each end of the second support beam, and the baffle matches the vertical section of the first support beam.

6. A process for forming a tray under a battery of an automobile as claimed in claim 5, wherein, The specific steps of combining and splicing two first support beams, two second support beams, at least one first reinforcing beam, and at least one second reinforcing beam to form a frame through a tool are as follows: Place the second reinforcing beam in the fixed position on the tool; Clamp the first reinforcing beam and the second reinforcing beam through the clamping groove, so that the first reinforcing beam is connected to the second reinforcing beam; Push the first support beam to the first reinforcing beam through the power mechanism on the tool, position the first support beam, and coat a layer of structural adhesive on both sides of the first support beam; Push the second support beam to the first reinforcing beam through the power mechanism on the tool, position the second support beam, and fix the baffles on both sides of the second support beam to the first support beam through the structural adhesive.

7. The forming process of the automobile battery lower tray according to claim 6, characterized in that: The mold used in one-piece forming is provided with a draft angle, and the angle of the draft angle is greater than or equal to 1.5°; When the profiles are spliced to form the frame, the coating is performed at the connection between adjacent profiles, and the different thicknesses required by the draft angle are met by sequentially stacking and laying the prepreg, specifically as follows: The prepreg of different heights is sequentially stacked and laid through the side vertical surface; The edge position of each layer of prepreg is cut according to the draft angle, and small patches are used to fill and reinforce the cutting gap or the part without wrapping.

8. A process for forming a tray under a battery of an automobile as claimed in claim 7, wherein, The tool structure for assembling the frame comprises a bottom plate, a placing groove for placing the second reinforcing beam is formed on the top of the bottom plate, and a placing plate is slidably connected inside the placing groove. Two groups of first positioning components are fixedly connected to the top of the bottom plate, each group of the first positioning components comprises two positioning plates and a first push plate, the first push plate is arranged between the two positioning plates, and the positioning plates are inclined towards the first push plate near one end of the placement slot; Two groups of second positioning components are arranged symmetrically between the two groups of first positioning components, each group of the second positioning components comprises two extrusion plates and a second push plate arranged between the two extrusion plates, and the extrusion plates are inclined towards the second push plate near one end of the placement slot; The first push plate, the second push plate and the placement plate are provided with power mechanisms on the side away from the placement slot, so that the first push plate and the second push plate move towards the placement slot, and the placement plate moves up and down; The extrusion plate is provided with a cylinder containing glue on the side away from the second push plate, and a roller is arranged on the side of the extrusion plate close to the placement slot and rotationally connected to the bottom plate, and a liquid outlet nozzle is arranged between the cylinder and the roller, when the second push plate pushes the first support beam to move towards the placement slot, the end of the first support beam extrudes the extrusion plate, so that the extrusion plate extrudes the cylinder and deforms, so that the glue in the cylinder is extruded from the liquid outlet nozzle and applied to the roller, and the glue on the roller is transferred to the two end faces of the first support beam with the movement of the roller. The height of the liquid outlet nozzle is less than or equal to the height of the roller, and the height of the liquid outlet nozzle is greater than or equal to the height of the first support beam; 9. A process for forming a tray under a battery of an automobile as claimed in claim 8, wherein, The shortest distance between the two positioning plates in each group is equal to the length of the second support beam; The shortest distance between the two extrusion plates in each group is less than the length of the first support beam; The extrusion plate is fixedly connected with an extrusion block on the side close to the cylinder, a vertical plate is arranged on the side of the cylinder away from the extrusion plate and fixedly connected to the bottom plate, the extrusion plate is fixedly connected with a slide rod on the side close to the vertical plate, and the slide rod is slidingly connected with the vertical plate; A first spring is fixedly connected between the extrusion plate and the vertical plate, so that the extrusion plate returns to the original position under the rebounding force of the first spring. The slide rod extends through the vertical plate, a push rod is arranged on the side of the roller close to the liquid outlet nozzle, the push rod is arranged in parallel with the slide rod, and the push rod and the slide rod are fixedly connected through a connecting rod; 10. A process for forming a tray under a battery of an automobile as claimed in claim 9, wherein, A second spring is fixedly connected to the end of the push rod close to the roller, when the extrusion plate is extruded and moves towards the cylinder, the push rod moves away from the roller through the slide rod, when the extrusion plate loses the extrusion force, the second spring on the push rod moves towards the roller through the slide rod under the rebounding force of the first spring, and the roller rotates to make the side coated with glue face the first support beam; The distance between the roller and the end of the extrusion plate is greater than the width of the first support beam. ​

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