Embedded sandwich bottom guard plate structure and forming die thereof

Abstract

The invention discloses an embedded sandwich bottom guard plate structure which comprises a foam sandwich, a steel mesh structure, an upper skin and a lower skin, and the steel mesh structure is embedded in the foam sandwich; the upper skin is fixedly connected to the top of the foam sandwich, and the lower skin is fixedly connected to the bottom of the foam sandwich; a latticed runner is arranged on the surface of the foam sandwich; the device has the advantages of being simple in structure and meeting national standard requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicle battery boxes, and in particular relates to an embedded sandwich bottom guard plate structure and a molding die thereof. Background Art

[0002] The existing battery box bottom guard plate structure is mostly divided into two types: steel plate stamping + PVC coating or aluminum alloy welding + PVC coating. Both solutions also need to consider mica sheets / paper, PC insulation sheets or other functional materials on the original basis, resulting in a relatively high overall weight, many parts and functional materials, complex assembly processes, and low cost-effectiveness. With the upgrade of the national standard for battery packs, the demand for the bottom of the box is getting higher and higher. For some bottom guard plate solutions, consideration will be given to adding energy impacts of 550J, 800J, or even 1000J or more (including vertical and oblique) and other more stringent working conditions. The original metal bottom guard plate solution is difficult to meet the new national standard requirements at the bottom of the battery cell and cold plate, that is, within the effective space. Summary of the invention

[0003] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0004] In order to overcome the deficiencies of the prior art, the present invention provides an embedded sandwich bottom guard plate structure and a forming mold thereof.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an embedded sandwich bottom guard plate structure, including a foam core, a steel mesh structure, an upper skin and a lower skin, the steel mesh structure is embedded in the foam core; the upper skin is fixedly connected to the top of the foam core, and the lower skin is fixedly connected to the bottom of the foam core; a grid-like flow channel is provided on the surface of the foam core.

[0006] Furthermore, the steel mesh structure and the foam core are integrally formed.

[0007] Furthermore, the foam core is integrally formed with the upper skin and the lower skin through the HP-RTM / WCM process.

[0008] As another aspect of the present application, a forming mold for forming an embedded sandwich bottom guard plate structure as mentioned above is also provided, including a trough body, a grid frame and a pushing assembly, the grid frame is arranged in the trough body, and the pushing assembly is arranged at the bottom of the trough body; a notch is arranged on the side wall of the trough body, and a movable plate is arranged in the notch, and the movable plate can move relative to the trough body, and when the pushing assembly pushes out the foam sandwich in the trough body, the movable plate moves downward relative to the trough body; when the pushing assembly is at the bottom of the trough body, the movable plate closes the notch.

[0009] Furthermore, the pushing assembly includes a pushing plate and a plurality of pushing blocks. The pushing blocks are arranged on the pushing plate and can move relative to the pushing plate.

[0010] Furthermore, a guide rod is provided on the push plate, a guide tube is provided at the bottom of the push block, the guide rod is inserted in the guide tube, a first return spring is provided on the guide rod, and one end of the first return spring is against the bottom of the push block.

[0011] Furthermore, a sliding block is provided on the movable plate, a first protrusion is provided on the side wall of the groove body, and a sliding groove for the sliding block to move is provided on the first protrusion.

[0012] Furthermore, an extension rod is provided at the bottom of the movable plate, a connecting plate is provided at the bottom of the trough body, a transmission rod assembly is provided on the connecting plate, the transmission rod assembly is rotatably connected to the connecting plate, one end of the transmission rod assembly is movably connected to the push plate, and the other end is movably connected to the extension rod.

[0013] Furthermore, the movable rod assembly includes a first connecting rod and a second connecting rod, there are two second connecting rods, which are respectively arranged at both ends of the first connecting rod; the first connecting rod is a hollow structure, one end of the second connecting rod is inserted into the first connecting rod, one second connecting rod is movably connected to the push plate, and the other second connecting rod is movably connected to the extension rod.

[0014] Furthermore, a mounting block is provided at the bottom of the trough body, a movable groove is provided on the mounting block, a supporting block is provided in the movable groove, an inclined surface is provided at one end of the supporting block, and a second return spring is provided at the other end. The inclined surface on the supporting block is below the movable plate, and a second protrusion is provided at the bottom of the movable plate, and the second protrusion rests on the inclined surface on the supporting block.

[0015] The invention is beneficial in that it provides an embedded sandwich bottom guard plate structure which is simple in structure and meets national standard requirements and a forming mold thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0017] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0018] In the attached picture: Figure 1 It is a structural schematic diagram of an embedded sandwich bottom guard plate structure in an embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of the grid-like flow channels on the foam core of the present invention.

[0020] Figure 3 It is a structural schematic diagram of a forming mold of an embedded sandwich bottom guard plate structure in an embodiment of the present invention.

[0021] Figure 4 for Figure 3 A sectional view of the conduit of the forming mold of the embedded sandwich bottom guard plate structure in the illustrated embodiment.

[0022] Figure 5 for Figure 4 Enlarged view of point A in .

[0023] Figure 6 for Figure 3 A cross-sectional view of a drive rod assembly of a forming mould having an embedded sandwich bottom guard plate structure in the illustrated embodiment.

[0024] Figure 7 for Figure 6 Enlarged view of point B in .

[0025] Figure 8 for Figure 3 A cross-sectional view of a mounting block of a forming mould for an embedded sandwich floor panel structure in the illustrated embodiment.

[0026] Fig. 9 for Figure 8 Enlarged view of point C in the figure.

[0027] The meanings of the reference numerals in the figures are as follows: 1. Foam core; 2. Steel mesh structure; 3. Upper skin; 4. Lower skin; 100, trough body; 101, first protrusion; 102, connecting plate; 103, first connecting rod; 104, second connecting rod; 105, mounting block; 106, supporting block; 107, second return spring; 200, grid frame; 300, movable plate; 301, slider; 302, extension rod; 303, second protrusion; 400, pushing assembly; 401, pushing plate; 402, pushing block; 403, guide rod; 404, guide tube; 405, first return spring. DETAILED DESCRIPTION

[0028] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0029] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0030] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0031] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0032] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0033] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0034] like Figure 1 As shown, an embedded sandwich bottom guard plate structure includes a foam core 1, a steel mesh structure 2, an upper skin 3 and a lower skin 4. The foam core 1 has a thickness of 3-15 mm, a length of 1457-1575 mm, and a width of 1187-1225 mm. The foam core 1 is a hard structure, the steel mesh structure 2 is embedded in the foam core 1, and the steel mesh structure 2 and the foam core 1 are foamed and integrally formed; the upper skin 3 and the lower skin 4 are both made of composite glass fiber materials, and the thickness of the upper and lower skins 4 is 0.6-1.8 mm; the upper skin 3 is fixedly connected to the top of the foam core 1, and the lower skin 4 is fixedly connected to the bottom of the foam core 1. The foam core 1 and the upper skin 3 and the lower skin 4 are integrally formed by HP-RTM / WCM / PCM and other processes.

[0035] The actual dimensions of the foam core, upper skin and lower skin can be adjusted according to customer customization requirements.

[0036] Due to the existence of the steel mesh structure, it can withstand higher energy impact requirements, the overall bottom guard plate structure has better rigidity, low density, light weight, and can simultaneously solve the functional advantages of insulation, corrosion resistance, flame retardancy, sealing, weight reduction, etc. Through the one-piece molding of the bottom guard plate parts, the cumbersome assembly process is solved, which is simple and efficient.

[0037] The following table is a comparison table of the embedded sandwich bottom guard plate structure of this application and the simulation analysis structure of the ordinary metal bottom guard plate. The simulation data is pre-processed using Hypermesh and then post-processed using ABAQUS or LS-Dyna.

[0038] As another aspect of the present application, the present application also provides a processing technology for producing the above-mentioned embedded sandwich bottom guard plate structure, comprising the following steps: a. Place the steel mesh structure into an aluminum alloy forming mold for foaming and forming a foam core; b. Pour filling resin on the surface of the foam sandwich; c. Connect the upper skin and the lower skin to the foam core; d. The connected upper and lower skins are cured to obtain the bottom guard plate of the product.

[0039] like Figure 2 As shown, after the foam core is formed in the molding die, a grid-like resin flow channel is formed on the surface of the foam core.

[0040] By setting up grid-like flow channels, resin flow channels are created in the structure, and the glue coating range on the core surface is increased during the molding process of HP-RTM and other processes combined with the composite skin, so that the large surface of the entire sandwich bottom guard plate can be fully filled with resin. After the product is molded and demoulded, there will be no quality defects, such as dry spots, pitting, lack of penetration and other undesirable phenomena.

[0041] Among them, Figure 3-9 As shown, the molding mold includes a tank body 100, a grid frame 200 and a pushing assembly 400. The grid frame 200 is arranged in the tank body 100, and the pushing assembly 400 is arranged at the bottom of the tank body 100. A notch is arranged on the side wall of the tank body 100, and a movable plate 300 is arranged in the notch. The movable plate 300 can move relative to the tank body 100. When the pushing assembly 400 pushes out the foam core 1 in the tank body 100, the movable plate 300 moves downward relative to the tank body 100; when the pushing assembly 400 is at the bottom of the tank body 100, the movable plate 300 closes the notch.

[0042] Specifically, the pushing assembly 400 includes a pushing plate 401 and a plurality of pushing blocks 402. The pushing blocks 402 are arranged on the pushing plate 401 and can move relative to the pushing plate 401. A guide rod 403 is provided on the pushing plate 401, and a guide tube 404 is provided at the bottom of the pushing block 402. The guide rod 403 is inserted into the guide tube 404, and a first return spring 405 is provided on the guide rod 403. One end of the first return spring 405 rests on the bottom of the pushing block 402. A sliding block 301 is provided on the movable plate 300, and a first protrusion 101 is provided on the side wall of the groove body 100. The first protrusion 101 is provided with a sliding groove for the sliding block 301 to move.

[0043] An extension rod 302 is provided at the bottom of the movable plate 300, a connecting plate 102 is provided at the bottom of the trough body 100, a transmission rod assembly is provided on the connecting plate 102, the transmission rod assembly is rotatably connected to the connecting plate 102, one end of the transmission rod assembly is movably connected to the push plate 401, and the other end is movably connected to the extension rod 302.

[0044] Furthermore, the movable rod assembly includes a first connecting rod 103 and a second connecting rod 104, and there are two second connecting rods 104, which are respectively arranged at both ends of the first connecting rod 103; the first connecting rod 103 is a hollow structure, and one end of the second connecting rod 104 is inserted into the first connecting rod 103, one second connecting rod 104 is movably connected to the push plate 401, and the other second connecting rod 104 is movably connected to the extension rod 302.

[0045] A mounting block 105 is provided at the bottom of the slot body 100, and a movable slot is provided on the mounting block 105. A supporting block 106 is provided in the movable slot, and a slope is provided at one end of the supporting block 106, and a second return spring 107 is provided at the other end. The slope on the supporting block 106 is located below the movable plate 300, and a second protrusion 303 is provided at the bottom of the movable plate 300, and the second protrusion 303 is abutted against the slope on the supporting block 106; the second protrusion 303 abuts against the supporting block 106 to provide a supporting force for the movable plate 300, so that the movable plate 300 is at the notch to close the notch; the setting of the slope can push the supporting block 106 to move into the movable slot when the movable plate 300 is subjected to a large thrust, so that the movable plate 300 descends normally.

[0046] The grid frame 200 can be replaced as needed, so as to change the flow channel setting on the surface of the foam core 1 and change the combination effect of the foam core 1 and the upper and lower skins; when the foam core 1 is foaming, the movable plate 300 is in the gap to close the gap, and the pushing component 400 is at the bottom of the tank body 100; after the instant noodle core is foamed, the push plate 401 moves upward, and the push block 402 moves with the push plate 401, and part of the push block 402 is against the grid frame 200 so that the push plate 401 moves relative to the push block 402 of the part, so as to ensure The push plate 401 moves upward as a whole, and the push block 402 pushes the foam core 1 out of the groove body 100; the push plate 401 moves upward and drives the second connecting rod 104 to move, and the second connecting rod 104 drives the first connecting rod 103 to rotate, and the other second connecting rod 104 drives the extension rod 302 to move downward, so that the movable plate 300 moves relative to the groove body 100 to open a gap, exposing part of the side wall of the foam core 1, so that the formed foam core 1 can be clamped by a clamp and transported.

[0047] The use of the molding mold of the present application to form the foam core makes the foaming process more convenient and improves the degree of automation of the foaming process; at the same time, the pushing component and the movable plate can be used to automatically push the molded foam core out of the groove body, so that when the foam core is still in the groove body, a part of its side wall can be directly exposed, which is convenient for the clamp to clamp and take the material while preventing the entire foam core from rising directly from the groove body and then sliding to the edge of the groove body, thereby improving the stability of material taking in the foam core processing process and improving the yield of the foam core.

[0048] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. An embedded sandwich bottom guard plate structure, characterized in that: It includes a foam core, a steel mesh structure, an upper skin and a lower skin. The steel mesh structure is embedded in the foam core. The upper skin is fixedly connected to the top of the foam core, and the lower skin is fixedly connected to the bottom of the foam core. A grid-like flow channel is provided on the surface of the foam core.

2. The embedded sandwich bottom guard plate structure according to claim 1 is characterized in that: The steel mesh structure and the foam core are integrally formed.

3. The embedded sandwich bottom guard plate structure according to claim 1 is characterized in that: The foam core is integrally formed with the upper skin and the lower skin by HP-RTM / WCM process.

4. A molding die for molding the embedded sandwich bottom guard plate structure as described in claims 1-3, characterized in that: It includes a trough body, a grid frame and a pushing component, the grid frame is arranged in the trough body, and the pushing component is arranged at the bottom of the trough body; a notch is arranged on the side wall of the trough body, and a movable plate is arranged in the notch, and the movable plate can move relative to the trough body, and when the pushing component pushes out the foam core in the trough body, the movable plate moves downward relative to the trough body; when the pushing component is at the bottom of the trough body, the movable plate closes the notch.

5. The forming mold of the embedded sandwich bottom guard plate structure according to claim 4 is characterized in that: The pushing assembly comprises a pushing plate and a plurality of pushing blocks. The pushing blocks are arranged on the pushing plate and can move relative to the pushing plate.

6. The forming mold of the embedded sandwich bottom guard plate structure according to claim 5, characterized in that: A guide rod is provided on the push plate, a guide tube is provided at the bottom of the push block, the guide rod is inserted into the guide tube, a first return spring is provided on the guide rod, and one end of the first return spring is against the bottom of the push block.

7. The forming mold of the embedded sandwich bottom guard plate structure according to claim 4, characterized in that: The movable plate is provided with a slider, the side wall of the groove body is provided with a first protrusion, and the first protrusion is provided with a sliding groove for the slider to move.

8. The forming mold of the embedded sandwich bottom guard plate structure according to claim 4, characterized in that: An extension rod is provided at the bottom of the movable plate, a connecting plate is provided at the bottom of the trough body, a transmission rod assembly is provided on the connecting plate, the transmission rod assembly is rotatably connected to the connecting plate, one end of the transmission rod assembly is movably connected to the push plate, and the other end is movably connected to the extension rod.

9. The forming mold of the embedded sandwich bottom guard plate structure according to claim 8, characterized in that: The movable rod assembly includes a first connecting rod and a second connecting rod, wherein the second connecting rods are two and are respectively arranged at both ends of the first connecting rod; the first connecting rod is a hollow structure, one end of the second connecting rod is inserted into the first connecting rod, one of the second connecting rods is movably connected to the push plate, and the other second connecting rod is movably connected to the extension rod.

10. The forming mold of the embedded sandwich bottom guard plate structure according to claim 4, characterized in that: A mounting block is provided at the bottom of the groove body, a movable groove is provided on the mounting block, a support block is provided in the movable groove, an inclined surface is provided at one end of the support block, and a second return spring is provided at the other end, the inclined surface on the support block is below the movable plate, and a second protrusion is provided at the bottom of the movable plate, and the second protrusion rests on the inclined surface on the support block.

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