A rotomolded battery pack thin-shaped upper cover protection structure

Abstract

The utility model discloses a rotomolding battery package thin shape upper cover protection structure, including shaping inner mould, shaping outer mould and even force applying mechanism, the convex surface of convex setting has on the shaping inner mould upper surface, the recessed surface of recessed setting has on the shaping outer mould lower surface, the utility model discloses can be through the setting of length direction force applying piece and width direction force applying piece to product forming mould pressure exertion, and pressure exertion range covers each surface of product, can fully solve the problem that product produces convex or recessed, specifically, directly place product in the accommodation cavity, and cover through product forming mould, after that, through length direction force applying piece to product forming mould's periphery side each place simultaneous force, again through width direction force applying piece to the surface of top pressure plate and the two surfaces of opposite side of periphery shaping ring simultaneous pressure exertion, thereby guaranteeing that product contracts evenly will not appear convex or recessed phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of battery pack cover manufacturing technology, specifically to a rotational molding battery pack thin cover protective structure. Background Technology

[0002] Modern electric vehicle battery packs commonly employ multi-layer (e.g., ten-layer) cell stacking structures to achieve high energy density. The battery pack top cover, as a critical structural component, must provide reliable sealing protection for the entire pack while also withstanding the expansion forces generated by the internal cells during charge-discharge cycles and potential thermal runaway ("anti-bulging"). In existing designs, the overall height of the battery pack (especially the total assembly height including the top cover) and the dimensional tolerances of the top cover's mating mounting surface have extremely stringent requirements: even slight errors will prevent components from being properly assembled, while slightly larger errors will cause difficulties in top cover installation or seal failure.

[0003] In existing designs, a common problem is that dents or malfunctions are prone to occur during the production of thin battery pack covers. This is because plastic products are at a high temperature when they are first produced and demolded. As the temperature gradually decreases, the product size shrinks. At the same time, some products have reinforcing ribs designed on their surface to prevent deformation. However, most products are longer and thinner, making them more prone to bulges or dents in the airflow channels during the shrinkage process.

[0004] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0005] The purpose of this invention is to provide a thin protective cover structure for a rotationally molded battery pack.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A rotational molding battery pack thin top cover protective structure includes a shaping inner mold, a shaping outer mold, and a uniform force application mechanism; An outer mold is mounted on the outside of an inner mold, forming a product molding mold. This product molding mold has a receiving cavity for accommodating the product and positioning it between the inner and outer molds. The outer mold includes a peripheral shaping ring and a top pressure plate. Viewed from above, the peripheral shaping ring is annular with open ends, its lower end face forming the lower surface of the outer mold. The top pressure plate is positioned and connected to the upper end of the peripheral shaping ring to close the upper end. A uniform force application mechanism includes a force-applying component in the length direction and a force-applying component in the width direction. The force-applying component in the length direction is parallel to the length side of the product molding mold and is fitted onto the outer periphery of the peripheral shaping ring. The force-applying component in the length direction has a ring-shaped structure. The annular structure has the same outer contour as the peripheral shaping ring, so that the force-applying component in the length direction applies a first pressure distributed along the circumference of the peripheral shaping ring to the outer periphery of the peripheral shaping ring. The first pressure applied by the force-applying component in the length direction to each side of the outer periphery of the peripheral shaping ring is perpendicular to each corresponding side of the outer periphery of the peripheral shaping ring. The force-applying component in the width direction is arranged parallel to the edge of the product forming mold in the width direction and is sleeved on the outer periphery of the product forming mold. The force-applying component in the width direction has a frame structure. The inner frame contour of the frame structure is matched with the cross-sectional shape made along the width direction of the product forming mold, so as to apply a second pressure of the same magnitude and perpendicular to the corresponding surface to the surface of the top pressure plate and the two opposite surfaces of the peripheral shaping ring at the same time.

[0007] In the above scheme, the product molding mold is used to hold the product. Because the product is at a high temperature when it is demolded after production, the product size will shrink as the temperature gradually decreases. The product molding mold can hold the product to prevent shrinkage, dents or twisting and bulging of the product.

[0008] In the above scheme, multiple force-applying components can be set in both the length direction and the width direction. However, the force-applying components in the length direction can only be set on the periphery of the product forming mold and apply force to all parts of the outer periphery of the product forming mold at the same time, but cannot apply force to the upper and lower end faces of the product forming mold. At the same time, when multiple force-applying components in the length direction are set on the periphery of the product forming mold, they will be set sequentially from bottom to top along the height direction of the product forming mold.

[0009] Multiple force-applying components in the width direction are arranged parallel to the edge of the product forming mold in the width direction, and the multiple force-applying components in the width direction are spaced apart. The force-applying components in the width direction can simultaneously apply pressure to the surface of the top pressure plate and the two opposite surfaces of the peripheral shaping ring.

[0010] Therefore, in order to achieve the goal of applying force simultaneously and with the same magnitude, both the force-applying components in the length direction and the force-applying components in the width direction can be set as elastic bands.

[0011] In the above solution, pressure can be applied to the product molding mold by setting up force-applying components in the length direction and the width direction, and the pressure application range covers all surfaces of the product, which can effectively solve the problem of product protrusion or depression. Specifically, the product is placed directly in the receiving cavity and covered by the product molding mold. Then, the force-applying components in the length direction apply force to all parts of the outer periphery of the product molding mold at the same time, and the force-applying components in the width direction apply pressure to the surface of the top pressure plate and the two opposite surfaces of the peripheral shaping ring at the same time, thereby ensuring that the product shrinks evenly and does not have protrusion or depression.

[0012] In the above scheme, the first pressure is generally equal to the second pressure.

[0013] A further technical solution includes a width-direction force-applying component comprising a width binding band, and multiple isolation plates are provided on the surfaces of the peripheral shaping ring and the top pressure plate. The isolation plates are parallel to the surface of the product forming mold along its length direction, and the length of the isolation plates is greater than or equal to the length of the product forming mold, and the thickness is greater than the thickness of the length-direction force-applying component. On the outer periphery of the product forming mold, the length-direction force-applying component and the width binding band are arranged sequentially from the inside to the outside, and are both sleeved on the outer side of the product forming mold. The isolation plates are located between the inner surface of the width binding band and the outer surface of the product forming mold, thereby separating the inner surface of the width binding band from the outer surface of the length-direction force-applying component.

[0014] With the above design, the force-applying component in the width direction can better apply pressure to the surface of the top pressure plate and the two opposing surfaces of the circumferential shaping ring at the same time, without affecting the use of the force-applying component in the length direction.

[0015] Specifically, when using the width-direction force-applying component, the length-direction force-applying component is first fitted onto the periphery of the product molding mold, and force is applied simultaneously to various points on the outer periphery of the product molding mold. Then, along the length direction of the product molding mold, the partition plate is placed on the surface of the product molding mold. After that, the width binding band is fitted onto the outer side of the product molding mold. At this time, the length-direction force-applying component and the width binding band are arranged sequentially from the inside to the outside. The partition plate separates the inner surface of the width binding band from the outer surface of the length-direction force-applying component, and each width binding band applies a second pressure to the outer surface of the product molding mold through the partition plate.

[0016] The partition plate separates the inner surface of the width binding band from the outer surface of the force-applying component in the length direction. At the same time, it can also ensure that the pressure applied by each width binding band to the product molding die is balanced, and that the width binding band does not apply pressure only to the surface of the product molding die it is in contact with.

[0017] When the width binding band applies pressure, it indirectly applies pressure to the surfaces of the peripheral shaping ring and the top pressure plate through the isolation plates set on the surfaces of the peripheral shaping ring and the top pressure plate.

[0018] Further technical solutions, The upper surface of the shaping inner mold has a raised surface; The lower surface of the outer mold has a recessed surface; the product forming mold is formed by the mating of the inner mold and the outer mold; in the product forming mold, the upper surface of the inner mold and the lower surface of the outer mold are closely fitted, and the protruding surfaces face the recessed surface and are spaced apart to form the receiving cavity for accommodating the product between them.

[0019] The above design allows the cavity to fully cover the product.

[0020] Further technical solutions, The shaping inner mold includes a base plate. The upper surface of the base plate is provided with a quadrilateral structure made up of four vertical plates. The lower end of the quadrilateral structure is positioned and connected to the base plate, and the upper end is positioned and connected to an anti-dent plate. The peripheral surface of the anti-dent plate is flush with the peripheral surface of the quadrilateral structure. The peripheral surface of the quadrilateral structure, the peripheral surface of the anti-dent plate, and the upper surface combine to form a raised surface. The lower end face of the peripheral shaping ring abuts against the upper surface of the base plate.

[0021] With the above design, the top of the product will not be concave. At the same time, the base plate can make the lower end of the product, the lower end of the quadrilateral structure, and the lower end of the shaping outer film on the same horizontal plane, that is, the upper surface of the base plate.

[0022] Further technical solutions, It also includes a rectangular frame, with rectangular holes on all four sides to guide the width binding strap through; the rectangular frame is set on the lower surface of the base plate; When the width binding band is fitted onto the outside of the product forming mold, the upper inner wall of the rectangular hole presses against the lower inner surface of the width binding band, the upper inner surface of the width binding band presses against the partition plate on the upper surface of the top pressure plate, and the peripheral inner wall of the width binding band presses against the partition plate on the outer peripheral side of the peripheral shaping ring.

[0023] The above design allows the width restraint straps to fully expand, and ensures that the force applied by each width restraint strap is the same after expansion.

[0024] If there is no rectangular frame, then there is no rectangular hole either. In this case, the width binding strap is directly pressed against the lower surface of the base plate. At this time, the width binding strap is not open enough, and the width binding strap is prone to slipping.

[0025] Further technical solutions, The lower surface of the outer mold is provided with hinges that are positioned and connected to the base plate in the inner mold.

[0026] The above design allows for quick assembly and disassembly of the outer mold, and also facilitates rapid product positioning.

[0027] Specifically, during use, the hinges are used to open the peripheral shaping rings, allowing the product to be properly fitted onto the outside of the quadrilateral structure.

[0028] Further technical solutions, The circumferential shaping ring includes two width plates and two length plates. The two length plates are symmetrical and spaced apart. The two width plates are respectively positioned at both ends of the length plates, and both width plates are located between the two length plates. The width plates are perpendicular to the length plates, and the end faces of the width plates and the surfaces of the length plates are in clearance fit.

[0029] The above design allows for quick assembly and positioning when the peripheral shaping ring is fixed.

[0030] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0031] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0032] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0033] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing this case.

[0034] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0035] The working principle and advantages of this utility model are as follows: This invention applies pressure to the product forming mold by setting up force-applying components in the length and width directions, and the pressure application range covers all surfaces of the product, which can effectively solve the problem of protrusions or depressions in the product. Specifically, the product is placed directly in the receiving cavity and covered by the product forming mold. Then, the force-applying components in the length direction apply force to all parts of the outer periphery of the product forming mold at the same time, and the force-applying components in the width direction apply pressure to the surface of the top pressure plate and the two opposing surfaces of the peripheral shaping ring at the same time, thereby ensuring that the product shrinks evenly and does not have protrusions or depressions. Attached Figure Description

[0036] Appendix Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model; Appendix Figure 2 This is a schematic diagram of the uniform force application mechanism in an embodiment of the present utility model; Appendix Figure 3 This is a schematic diagram of the longitudinal section structure of the product molding die in the embodiment of this utility model; Appendix Figure 4 This is a schematic diagram of the structure of the product placed on the shaping inner mold in an embodiment of the present utility model; Appendix Figure 5 This is a schematic diagram of the width binding strap structure in an embodiment of the present utility model; Appendix Figure 6 This is a schematic diagram of the top pressure plate structure in an embodiment of the present utility model; Appendix Figure 7 This is a schematic diagram of the rectangular frame structure in an embodiment of the present utility model; Appendix Figure 8 This is a schematic diagram of the cross-sectional structure of the product molding die in an embodiment of this utility model; Appendix Figure 9 This is a schematic diagram of the hinge structure in an embodiment of the present utility model; Appendix Figure 10 This is a schematic diagram of the longitudinal section structure of the product molding die in the embodiment of this utility model; Appendix Figure 11 This is a schematic diagram of the structure when the raised surface and the concave surface form a receiving cavity in an embodiment of the present utility model.

[0037] In the above attached diagrams: 1. Inner mold; 2. Outer mold; 3. Uniform force application mechanism; 4. Raised surface; 5. Recessed surface; 6. Peripheral shaping ring; 7. Top pressure plate; 8. Force application component in the length direction; 9. Force application component in the width direction; 10. Width binding band; 11. Isolation plate; 12. Base plate; 13. Quadrilateral structure; 14. Anti-dent plate; 15. Rectangular frame; 16. Rectangular hole; 17. Hinge; 18. Width plate; 19. Length plate. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0039] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0040] See appendix Figure 1 - Figure 11 As shown, a rotational molding battery pack thin top cover protective structure includes a shaping inner mold 1, a shaping outer mold 2, and a uniform force application mechanism 3. The shaping outer mold 2 covers the outside of the shaping inner mold 1 and is combined to form a product forming mold. The product forming mold has a receiving cavity for accommodating the product and positioning it between the shaping inner mold 1 and the shaping outer mold 2. The shaping outer mold 2 includes a peripheral shaping ring 6 and a top pressure plate 7. Viewed from a top angle, the peripheral shaping ring 6 is annular and open at both ends. Its lower end face is the lower surface of the shaping outer mold 2. The top pressure plate 7 is positioned and connected to the upper end of the peripheral shaping ring 6 to close the upper end. The uniform force application mechanism 3 includes a force application member 8 in the length direction and a force application member 9 in the width direction. The force application member 8 in the length direction is arranged parallel to the side of the product forming mold in the length direction and is sleeved on the peripheral mold. On the outer periphery of the side shaping ring 6, the length-direction force-applying member 8 has a ring-shaped structure. The shape of this ring-shaped structure is the same as the outer contour of the side shaping ring 6, so that the length-direction force-applying member 8 applies a first pressure distributed along the circumference of the side shaping ring 6 to the outer periphery of the side shaping ring 6. The direction of the first pressure applied by the length-direction force-applying member 8 to each side of the outer periphery of the side shaping ring 6 is perpendicular to each corresponding side of the outer periphery of the side shaping ring 6. The width-direction force-applying member 9 is arranged parallel to the edge of the product forming mold in the width direction and is sleeved on the outer periphery of the product forming mold. The width-direction force-applying member 9 has a frame-shaped structure. The inner frame contour of this frame-shaped structure is matched with the cross-sectional shape made along the width direction of the product forming mold, so as to apply the same magnitude and perpendicular to the corresponding surface to the surface of the top pressure plate 7 and the two opposite surfaces of the side shaping ring 6 at the same time.

[0041] The length-direction force-applying component 8 and the width-direction force-applying component 9 are fitted together from the inside out, based on the product molding mold. However, which one of the length-direction force-applying component 8 or the width-direction force-applying component 9 is located on the inside is not fixed and can be set according to requirements.

[0042] In this utility model, the product forming mold is used to hold the product. Because the product is at a high temperature when it is demolded after production, the product size will shrink as the temperature gradually decreases. The product forming mold can hold the product to prevent the product from shrinking, sinking or twisting and bulging.

[0043] In this utility model, multiple force-applying components 8 in the length direction and multiple force-applying components 9 in the width direction can be provided. However, the force-applying component 8 in the length direction can only be provided on the periphery of the product forming mold and apply force to all parts of the outer periphery of the product forming mold at the same time, but cannot apply force to the upper and lower end surfaces of the product forming mold. At the same time, when multiple force-applying components 8 in the length direction are provided on the periphery of the product forming mold, they will be arranged sequentially from bottom to top along the height direction of the product forming mold.

[0044] Multiple force-applying components 9 in the width direction are arranged parallel to the edge of the product forming mold in the width direction, and the multiple force-applying components 9 in the width direction are spaced apart. The force-applying components 9 in the width direction can simultaneously apply pressure to the surface of the top pressure plate 7 and the two opposing surfaces of the peripheral shaping ring 6.

[0045] Therefore, in order to achieve the goal of applying force simultaneously and with the same magnitude, the force-applying component 8 in the length direction and the force-applying component 9 in the width direction can both be set as elastic bands.

[0046] In this invention, pressure can be applied to the product forming mold by setting the force-applying component 8 in the length direction and the force-applying component 9 in the width direction, and the pressure application range covers all surfaces of the product, which can effectively solve the problem of product protrusion or depression. Specifically, the product is placed directly in the receiving cavity and covered by the product forming mold. Then, the force-applying component 8 in the length direction applies force to all parts of the outer periphery of the product forming mold at the same time, and the force-applying component 9 in the width direction applies pressure to the surface of the top pressure plate 7 and the two opposing surfaces of the peripheral shaping ring 6 at the same time, thereby ensuring that the product shrinks evenly and does not have protrusion or depression.

[0047] In the above scheme, the first pressure is generally equal to the second pressure.

[0048] Preferably, the width-direction force-applying component 9 includes a width binding band 10, and the surfaces of the peripheral shaping ring 6 and the top pressure plate 7 are each provided with a plurality of isolation plates 11. The isolation plates 11 are parallel to the surface of the product forming mold along its length direction, and the length of the isolation plates 11 is greater than or equal to the length of the product forming mold, and the thickness is greater than the thickness of the length-direction force-applying component 8. On the outer periphery of the product forming mold, the length-direction force-applying component 8 and the width binding band 10 are arranged sequentially from the inside to the outside, and are both sleeved on the outer side of the product forming mold. The isolation plates 11 are located between the inner surface of the width binding band 10 and the outer surface of the product forming mold, so as to separate the inner surface of the width binding band 10 from the outer surface of the length-direction force-applying component 8.

[0049] With the above design, the force-applying component 9 in the width direction can better apply pressure to the surface of the top pressure plate 7 and the two opposing surfaces of the peripheral shaping ring 6 at the same time, without affecting the use of the force-applying component 8 in the length direction.

[0050] Specifically, when using the width-direction force-applying component 9, the length-direction force-applying component 8 is first fitted onto the periphery of the product molding mold, and force is applied simultaneously to various points on the outer periphery of the product molding mold. Then, along the length direction of the product molding mold, the partition plate 11 is placed on the surface of the product molding mold. After that, the width binding band 10 is fitted onto the outer side of the product molding mold. At this time, the length-direction force-applying component 8 and the width binding band 10 are arranged sequentially from the inside to the outside. The partition plate 11 will separate the inner surface of the width binding band 10 from the outer surface of the length-direction force-applying component 8, and each width binding band 10 will apply a second pressure to the outer surface of the product molding mold through the partition plate 11.

[0051] The partition plate 11 separates the inner surface of the width binding band 10 from the outer surface of the force-applying member 8 in the length direction. At the same time, it can also ensure that the pressure applied by each width binding band 10 to the product molding die is balanced, and that the width binding band 10 does not only apply pressure to the surface of the product molding die it is in contact with.

[0052] When the width binding strap 10 applies pressure, it indirectly applies pressure to the surfaces of the peripheral shaping ring 6 and the top pressure plate 7 through the isolation plate 11 set on the surface of the peripheral shaping ring 6 and the surface of the top pressure plate 7.

[0053] Preferably, the upper surface of the shaping inner mold 1 has a raised surface 4; The lower surface of the outer mold 2 has a recessed surface 5; the product forming mold is formed by the mating of the inner mold 1 and the outer mold 2; in the product forming mold, the upper surface of the inner mold 1 is in close contact with the lower surface of the outer mold 2, and the protruding surface 4 is opposite to the recessed surface 5 and is spaced apart to form the receiving cavity for accommodating the product between the two.

[0054] The above design allows the cavity to fully cover the product.

[0055] Preferably, the shaping inner mold 1 includes a base plate 12. The upper surface of the base plate 12 is provided with a quadrilateral structure 13 composed of four vertical plates. The lower end of the quadrilateral structure 13 is positioned and connected to the base plate 12, and the upper end is positioned and connected to an anti-dent plate 14. The peripheral surface of the anti-dent plate 14 is flush with the peripheral surface of the quadrilateral structure 13. The peripheral surface of the quadrilateral structure 13, the peripheral surface of the anti-dent plate 14, and the upper surface combine to form a raised surface 4. The lower end face of the peripheral shaping ring 6 abuts against the upper surface of the base plate 12.

[0056] With the above design, the top of the product will not be concave. At the same time, the bottom plate 12 can make the lower end of the product, the lower end of the quadrilateral structure 13 and the lower end of the outer mold be on the same horizontal plane, that is, on the upper surface of the bottom plate 12.

[0057] Preferably, it also includes a rectangular frame 15, with rectangular holes 16 on all four sides of the rectangular frame 15 to guide the width binding strap 10 through; the rectangular frame 15 is disposed on the lower surface of the base plate 12. When the width binding band 10 is sleeved on the outside of the product forming mold, the upper inner wall of the rectangular hole 16 is pressed against the lower inner surface of the width binding band 10, the upper inner surface of the width binding band 10 is pressed against the isolation plate 11 on the upper surface of the top pressure plate 7, and the peripheral inner wall of the width binding band 10 is pressed against the isolation plate 11 on the outer peripheral side of the peripheral shaping ring 6.

[0058] With the above design, the width restraint straps 10 can be fully opened, and after opening, the force applied by each width restraint strap 10 is the same.

[0059] If the rectangular frame 15 is not present, then the rectangular hole 16 will also not exist. In this case, the width binding band 10 will be directly pressed against the lower surface of the base plate 12. At this time, the width binding band 10 will not be open enough, and the width binding band 10 will easily slip.

[0060] Preferably, the lower surface of the outer mold 2 is provided with a hinge 17 that is positioned and connected to the bottom plate 12 in the inner mold 1.

[0061] The above design allows for quick assembly and disassembly of the outer mold 2, and also facilitates rapid product positioning.

[0062] Specifically, during use, the peripheral shaping ring 6 is opened by hinge 17, allowing the product to be properly fitted onto the outside of the quadrilateral structure 13.

[0063] Preferably, the peripheral shaping ring 6 includes two width plates 18 and two length plates 19. The two length plates 19 are symmetrical and spaced apart. The two width plates 18 are respectively arranged at both ends of the length plates 19, and both width plates 18 are located between the two length plates 19. The width plates 18 are perpendicular to the length plates 19, and the end face of the width plate 18 and the surface of the length plate 19 are in clearance fit.

[0064] With the above design, the assembly and positioning can be completed quickly when the peripheral shaping ring 6 is fixed.

[0065] The specific working principle is as follows: the two width plates 18 and the two length plates 19 are guided to flip to a flat position through the hinge 17. When the product needs to be shaped, the product is first placed outside the shaping inner mold 1 so that the bottom plate 12 abuts against the lower surface of the product, the upper surface of the anti-dent plate 14 abuts against the inner wall of the top of the product, and the inner wall of the product periphery abuts against the inner wall of the quadrilateral structure 13, in order to prevent the product from being dented.

[0066] Next, the two width plates 18 and the two length plates 19 can be flipped to a vertical position so that the two width plates 18 and the two length plates 19 are respectively attached to the outer surface of the product in the width direction and the outer surface of the product in the length direction. Then, the top pressure plate 7 is positioned and connected to the upper end of the peripheral shaping ring 6 (the peripheral shaping ring 6 is the structure formed by the combination of the two width plates 18 and the two length plates 19) to close the upper end. At this time, the top pressure plate 7 presses on the top outer surface of the product.

[0067] Then, the length-direction force-applying member 8 is sleeved on the periphery of the circumferential shaping ring 6 formed by the combination of the two width plates 18 and the two length plates 19, and the first pressure is applied simultaneously to each part of the outer periphery of the product molding mold (i.e., the two width plates 18 and the two length plates 19). Then, along the length direction of the product molding mold, the isolation plate 11 is placed on the surface of the product molding mold. After that, the width binding band 10 is sleeved on the outside of the product molding mold. At this time, the length-direction force-applying member 8 and the width binding band 10 are arranged sequentially from the inside to the outside. The isolation plate 11 will separate the inner surface of the width binding band 10 from the outer surface of the length-direction force-applying member 8, and each width binding band 10 will apply a second pressure to the outer surface of the product molding mold through the isolation plate 11.

[0068] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A thin top cover protective structure for a rotationally molded battery pack, characterized in that: It includes a shaping inner mold (1), a shaping outer mold (2), and a uniform force application mechanism (3); The outer mold (2) is placed on the outside of the inner mold (1) and combined to form a product forming mold. The product forming mold has a receiving cavity, which is used to hold the product so that the product is positioned between the inner mold (1) and the outer mold (2). The shaping outer mold (2) includes a peripheral shaping ring (6) and a top pressure plate (7). From a top view, the peripheral shaping ring (6) is ring-shaped and open at both ends. Its lower end face is the lower surface of the shaping outer mold (2). The top pressure plate (7) is positioned and connected to the upper end of the peripheral shaping ring (6) to close the upper end. The uniform force application mechanism (3) includes a force application component (8) in the length direction and a force application component (9) in the width direction; The force-applying component (8) in the length direction is set parallel to the edge of the product forming mold in the length direction and is sleeved on the outer periphery of the circumferential shaping ring (6). The force-applying component (8) in the length direction has a ring structure. The shape of the ring structure is the same as the outer contour of the circumferential shaping ring (6) so that the force-applying component (8) in the length direction applies a first pressure distributed along the circumference of the circumferential shaping ring (6) to the outer periphery of the circumferential shaping ring (6). The first pressure direction applied by the force-applying component (8) in the length direction to each side of the outer periphery of the circumferential shaping ring (6) is perpendicular to each side corresponding to the outer periphery of the circumferential shaping ring (6). The force-applying component (9) in the width direction is set parallel to the edge of the product forming mold in the width direction and is sleeved on the outer periphery of the product forming mold. The force-applying component (9) in the width direction has a frame structure. The inner frame outline of the frame structure is matched with the cross-sectional shape made along the width direction of the product forming mold. It is used to apply the same second pressure perpendicular to the corresponding surface to the surface of the top pressure plate (7) and the two surfaces opposite to the peripheral shaping ring (6) at the same time.

2. The thin top cover protective structure for a rotationally molded battery pack according to claim 1, characterized in that: The width-direction force-applying component (9) includes a width binding band (10), and the surfaces of the peripheral shaping ring (6) and the top pressure plate (7) are provided with multiple isolation plates (11). The isolation plates (11) are parallel to the surface of the product forming mold along the length direction. The length of the isolation plate (11) is greater than or equal to the length of the product forming mold, and the thickness is greater than the thickness of the length-direction force-applying component (8). On the outer periphery of the product forming mold, the length direction force application member (8) and the width binding band (10) are arranged sequentially from the inside to the outside, and are both sleeved on the outside of the product forming mold. The isolation plate (11) is located between the inner surface of the width binding band (10) and the outer surface of the product forming mold, so as to separate the inner surface of the width binding band (10) from the outer surface of the length direction force application member (8).

3. The thin top cover protective structure for a rotationally molded battery pack according to claim 2, characterized in that: The upper surface of the shaping inner mold (1) has a raised surface (4); The lower surface of the outer mold (2) has a recessed surface (5); the product forming mold is formed by the mating of the inner mold (1) and the outer mold (2); in the product forming mold, the upper surface of the inner mold (1) and the lower surface of the outer mold (2) are closely fitted, and the protruding surface (4) faces the recessed surface (5) and is spaced apart to form the receiving cavity for accommodating the product between them.

4. The thin top cover protective structure for a rotationally molded battery pack according to claim 2 or 3, characterized in that: The molded inner mold (1) includes a base plate (12). The upper surface of the base plate (12) is provided with a quadrilateral structure (13) made of four vertical plates. The lower end of the quadrilateral structure (13) is positioned and connected to the base plate (12), and the upper end is positioned and connected to an anti-dent plate (14). The peripheral surface of the anti-dent plate (14) is flush with the peripheral surface of the quadrilateral structure (13). The peripheral surface of the quadrilateral structure (13), the peripheral surface of the anti-dent plate (14), and the upper surface are combined to form a raised surface (4). The lower end face of the circumferential shaping ring (6) abuts against the upper surface of the base plate (12).

5. The thin top cover protective structure for a rotationally molded battery pack according to claim 4, characterized in that: It also includes a rectangular frame (15), which has rectangular holes (16) on all four sides to guide the width binding strap (10) through; the rectangular frame (15) is set on the lower surface of the base plate (12); When the width binding band (10) is fitted onto the outside of the product forming mold, the upper inner wall of the rectangular hole (16) is pressed against the lower inner surface of the width binding band (10), the upper inner surface of the width binding band (10) is pressed against the isolation plate (11) on the upper surface of the top pressure plate (7), and the peripheral inner wall of the width binding band (10) is pressed against the isolation plate (11) on the outer peripheral side of the peripheral shaping ring (6).

6. The thin top cover protective structure for a rotationally molded battery pack according to claim 1, characterized in that: The lower surface of the outer mold (2) is provided with a hinge (17) that is positioned and connected to the bottom plate (12) in the inner mold (1).

7. The thin top cover protective structure for a rotationally molded battery pack according to claim 1, characterized in that: The circumferential shaping ring (6) includes two width plates (18) and two length plates (19). The two length plates (19) are symmetrical and spaced apart. The two width plates (18) are respectively arranged at both ends of the length plates (19), and the two width plates (18) are located between the two length plates (19). The width plates (18) and the length plates (19) are arranged perpendicularly, and the end face of the width plate (18) and the surface of the length plate (19) are in clearance fit.

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