Hollow cylindrical heat insulation pad and manufacturing method thereof

Abstract

The invention relates to the field of battery heat insulation devices, in particular to a hollow cylindrical heat insulation pad and a manufacturing method thereof. The hollow cylindrical heat insulation pad comprises a hollow cylindrical heat insulation core material and an outer layer packaging film, wherein the hollow cylindrical heat insulation core material is formed by splicing the head end and the tail end of a sheet heat insulation core material after the sheet heat insulation core material is wound, and the outer layer packaging film is pasted and fixed to the outer side face of the sheet heat insulation core material and is wound together with the sheet heat insulation core material to form a barrel-shaped structure. The outer packaging film is provided with covering sections which cover and adhere the head end and the tail end of the hollow cylindrical heat insulation core material. The sheet-shaped heat insulation core material is wound to form the hollow cylindrical heat insulation core material, so that the heat insulation material is converted from a sheet shape to a barrel shape, and the head end and the tail end of the sheet-shaped heat insulation core material are spliced, so that the sheet-shaped heat insulation core material has a complete barrel shape; therefore, the problems that in the prior art, winding needs to be conducted manually in the columnar use environment, operation steps are tedious, and efficiency is low are solved.

Description

Technical Field

[0001] The present invention relates to the field of battery thermal insulation devices, and in particular to a "hollow cylinder" type thermal insulation pad and a manufacturing method thereof. Background Art

[0002] With the popularity of new energy vehicles, power batteries are also widely used as one of the core components. When a new energy vehicle collides, the power battery will be squeezed and short-circuited, and then thermal runaway will occur, causing a fire. Therefore, the safety of power batteries is a key issue that plagues the development of new energy vehicles.

[0003] In order to solve the problem of thermal runaway, domestic power battery companies currently usually adopt a combination of active protection technology and passive protection technology. Active protection mainly includes fire extinguishing agents, coolants and BMS (Battery Management System). Once thermal runaway occurs, the fire extinguishing agent directly extinguishes the fire, and the coolant starts cooling to cool down the thermal runaway battery to prevent further heat diffusion and cause the whole vehicle to burn. Passive protection mainly includes mechanical performance enhancement, insulation protection, and thermal insulation material protection.

[0004] For example, a Chinese invention patent application with application publication number CN110901201A discloses a process for preparing a power battery buffer thermal insulation pad, in which a sheet-shaped flame-retardant thermal insulation layer is provided, and packaging films are respectively provided on both sides of the flame-retardant thermal insulation layer, thereby obtaining a sheet-shaped buffer thermal insulation pad. When in use, the sheet-shaped buffer thermal insulation pad is arranged between adjacent battery cells to play a buffering and thermal insulation role.

[0005] However, the buffer insulation pad in the above patent is designed for square batteries and is a sheet structure. If it needs to be used in cylindrical batteries, electronic cigarettes or other cylindrical heating elements, the buffer insulation pad needs to be manually wound on the surface of the cylindrical battery or the cylindrical heating element and bonded, resulting in cumbersome operation steps, low efficiency, and easy displacement when splicing the ends. Summary of the invention

[0006] The purpose of the present invention is to provide a "hollow cylinder" type thermal insulation pad to solve the problem in the prior art that columnar heating elements need to be manually wound when setting up the thermal insulation pad, resulting in cumbersome operation steps and low efficiency; the purpose of the present invention is also to provide a manufacturing method of a "hollow cylinder" type thermal insulation pad to solve the above-mentioned technical problems.

[0007] To achieve the above purpose, the "hollow cylinder" type thermal insulation pad in the present invention adopts the following technical solution:

[0008] A "hollow cylindrical" type thermal insulation pad includes a "hollow cylindrical" type thermal insulation core material formed by splicing the ends of a sheet-like thermal insulation core material after winding, and also includes an outer packaging film that is adhered and fixed to the outer side of the sheet-like thermal insulation core material to be wound into a cylindrical structure together with the sheet-like thermal insulation core material, and the outer packaging film has a covering section that covers the ends of the "hollow cylindrical" type thermal insulation core material.

[0009] The beneficial effects of the above technical scheme are: the present invention pioneers a "hollow cylindrical" type thermal insulation pad, which completes the transformation of the thermal insulation material from sheet to tube by setting a "hollow cylindrical" type thermal insulation core material formed by splicing the ends of a sheet-like thermal insulation core material after winding. Since the sheet-like thermal insulation core material is spliced ​​at both ends, it has a complete cylindrical shape; the outer packaging film can be provided to protect the outside of the thermal insulation pad; by providing a covering section on the outer packaging film that can cover and stick to the ends of the "hollow cylindrical" type thermal insulation core material, it can not only increase the protection effect of the outer packaging film, but also play a fixing role, so that the ends of the "hollow cylindrical" type thermal insulation pad are not separated, and the cylindrical structure is always maintained. When it is set on the columnar heating element during use, it is only necessary to cover the "hollow cylindrical" type thermal insulation pad on the outside, and there is no need to wind it on site, which is convenient to operate and efficient, thereby solving the problem of manual winding in a columnar use environment in the prior art, resulting in cumbersome operation steps and low efficiency.

[0010] Furthermore, the "hollow cylindrical" type thermal insulation pad also includes an inner packaging film that is adhered and fixed to the inner side surface of the sheet-like thermal insulation core material so as to be rolled into a cylindrical structure together with the sheet-like thermal insulation core material.

[0011] The beneficial effects of the above technical solution are: it can not only protect the inner layer to prevent particles or fibers of the "hollow cylindrical" type insulation pad from falling and affecting the internal environment of the battery cell; it can also make the inner surface of the insulation pad smoother and easier to install.

[0012] Furthermore, the head and tail ends of the inner packaging film are spliced, and the shapes of the head and tail ends of the inner packaging film are adapted to the shapes of the head and tail ends of the "hollow cylindrical" type heat-insulating core material.

[0013] The beneficial effect of the above technical solution is to improve the protection effect of the inner layer.

[0014] Furthermore, the axial ends of the outer packaging film of the tubular structure and / or the inner packaging film of the tubular structure are provided with edge sealing sections for being pasted and fixed on the axial end faces of the "hollow cylindrical" type heat insulating core material after being folded.

[0015] The beneficial effect of the above technical solution is that the inner packaging film and / or the outer packaging film is used to protect the axial end face of the "hollow cylindrical" type insulation core material, which facilitates processing and improves the protection effect of the insulation pad.

[0016] Furthermore, the "hollow cylindrical" type thermal insulation pad also includes a protective layer fixed on the axial end surface of the "hollow cylindrical" type thermal insulation core material.

[0017] The beneficial effect of the above technical solution is that the end surface of the "hollow cylindrical" type insulation core material is protected.

[0018] To achieve the above purpose, the manufacturing method of the "hollow cylinder" type thermal insulation pad in the present invention adopts the following technical scheme:

[0019] A method for manufacturing a "hollow cylindrical" type thermal insulation pad includes the following processes: first, cutting a sheet-like thermal insulation core material and an outer packaging film into suitable shapes and sizes, reserving a covering section on the outer packaging film during the cutting process, and then gluing and fixing the outer packaging film to the outer side of the sheet-like thermal insulation core material, and then winding the two so that the head and tail ends of the sheet-like thermal insulation core material are spliced ​​into a "hollow cylindrical" type thermal insulation core material, and the outer packaging film is rolled together with the sheet-like thermal insulation core material into a tubular structure, and finally the head and tail ends of the "hollow cylindrical" type thermal insulation core material are covered and glued with the covering section of the outer packaging film.

[0020] The beneficial effect of the above technical solution is that the present invention pioneers a method for manufacturing a "hollow cylinder" type thermal insulation pad, firstly, cutting is performed to obtain suitable raw materials, and during the cutting process, a covering section is reserved on the outer packaging film, so as to facilitate fixing the sheet-like thermal insulation core material when curling; then the outer packaging film is pasted on the sheet-like thermal insulation core material, so that one winding can make the sheet-like thermal insulation core material and the outer packaging film into a cylindrical shape respectively, thereby avoiding repeated winding; then winding is performed, and during the winding process, the sheet-like thermal insulation core material is connected end to end, so that the sheet-like thermal insulation core material can be The "hollow cylinder" type insulation pad is wound into a tube shape. Due to the setting of the covering section, the covering section of the outer packaging film can be bonded after the winding is completed. At this time, the covering section is directly bonded, which can not only completely wrap the insulation core material, but also complete the fixation to avoid the head and tail ends of the insulation core material from separating from each other. That is to say, the "hollow cylinder" type insulation pad is pre-formed and is directly put on the periphery of the columnar heating element when in use. It is easy to operate and efficient, thereby solving the problem of manual winding in a columnar use environment in the prior art, which results in cumbersome operation steps and low efficiency.

[0021] Furthermore, the manufacturing method of the "hollow cylinder" type insulation pad also includes the process of cutting the inner packaging film into a suitable shape and size, and after cutting, the inner packaging film is pasted and fixed to the inner side surface of the sheet insulation core material, so that the inner packaging film is rolled into a cylindrical structure together with the sheet insulation core material.

[0022] The beneficial effects of the above technical solution are: it can not only protect the inner layer to prevent particles or fibers of the "hollow cylindrical" type insulation pad from falling and affecting the internal environment of the battery cell; it can also make the inner surface of the insulation pad smoother and easier to install; in addition, the inner layer packaging film is first bonded to the sheet insulation core material and then wound to avoid multiple windings.

[0023] Furthermore, the inner packaging film is spliced ​​at both ends, and when cutting the inner packaging film, the shapes of the inner packaging film at both ends are cut to match the shapes of the "hollow cylindrical" type insulation core material.

[0024] The beneficial effect of the above technical solution is to improve the protection effect of the inner layer.

[0025] Furthermore, when cutting the inner packaging film and / or the outer packaging film, a sealing edge section is reserved at the axial end of the inner packaging film and / or the outer packaging film that is to be wound into a cylindrical structure, so that the sealing edge section can be folded and pasted and fixed on the axial end face of the "hollow cylinder" type insulation core material before winding, or the sealing edge section can be folded and pasted and fixed on the axial end face of the "hollow cylinder" type insulation core material after winding.

[0026] The beneficial effect of the above technical solution is that it is easy to protect the axial end face of the "hollow cylindrical" type insulation core material, thereby improving the protection effect of the insulation core material.

[0027] Furthermore, when cutting the inner packaging film and / or the outer packaging film, the release paper between the portion of the inner packaging film and / or the outer packaging film that is to be pasted to the sheet-like insulation core material and the edge sealing section is cut; when cutting the outer packaging film, the release paper between the portion of the outer packaging film that is to be pasted to the sheet-like insulation core material and the covering section is cut.

[0028] The beneficial effect of the above technical solution is that it is easy to paste, and by cutting the release paper, it is convenient to retain the release paper on the edge sealing section and / or the covering section before pasting, thereby avoiding contamination of the adhesive layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural schematic diagram of Example 1 of the "hollow cylindrical" type thermal insulation pad of the present invention;

[0030] Figure 2 This is an exploded view of Example 1 of the "hollow cylinder" type thermal insulation pad of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the "hollow cylindrical" type thermal insulation pad before winding in Example 1 of the present invention;

[0032] Figure 4It is a schematic flow chart of Example 1 of the method for manufacturing a "hollow cylinder" type thermal insulation pad in the present invention;

[0033] Figure 5 This is a schematic diagram of the combination of the inner packaging film and the carrier film in Example 3 of the "hollow cylindrical" type thermal insulation pad of the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the "hollow cylindrical" type thermal insulation pad before winding in Example 3 of the present invention;

[0035] Figure 7 This is a schematic structural diagram of Example 3 of the "hollow cylindrical" type thermal insulation pad of the present invention;

[0036] Figure 8 It is an exploded view of Example 3 of the "hollow cylinder" type thermal insulation pad in the present invention.

[0037] In the figure: 1. inner packaging film; 11. edge sealing section; 2. sheet-like thermal insulation core material; 21. head end splicing end; 22. tail end splicing end; 3. outer packaging film; 31. covering section; 4. "hollow cylinder" type thermal insulation core material; 5. load-bearing film; 6. sealing ring. DETAILED DESCRIPTION

[0038] In Example 1 of the "hollow cylindrical" type thermal insulation pad (hereinafter referred to as thermal insulation pad) of the present invention:

[0039] The thermal insulation pad in this embodiment includes a "hollow cylindrical" type thermal insulation core material, an inner packaging film pasted on the inner side of the "hollow cylindrical" type thermal insulation core material, and an outer packaging film pasted on the outer side of the "hollow cylindrical" type thermal insulation core material. The "hollow cylindrical" type thermal insulation core material is wound by a sheet-like thermal insulation core material, the head and tail of the sheet-like thermal insulation core material are spliced ​​together, and then the covering section on the outer packaging film is bonded and fixed to the head and tail ends of the sheet-like thermal insulation core material, so that the sheet-like thermal insulation core material can maintain a cylindrical structure after winding. When it is necessary to set a thermal insulation pad on the outside of the columnar heating element, it can be directly mounted on the outside, which is simple to operate and efficient.

[0040] like Figure 1 and Figure 2 As shown, the thermal insulation pad includes a "hollow cylindrical" type thermal insulation core material 4, an inner packaging film 1 pasted on the inner side of the "hollow cylindrical" type thermal insulation core material 4, and an outer packaging film 3 pasted on the outer side of the "hollow cylindrical" type thermal insulation core material 4, wherein the "hollow cylindrical" type thermal insulation core material 4 is formed by winding a sheet-like thermal insulation core material 2.

[0041] Specifically, Figure 3As shown, the sheet-like heat-insulating core material 2 is roughly rectangular, wherein two sides are straight sides, forming the straight sides of the sheet-like heat-insulating core material 2, and the other two sides have a concave-convex structure, respectively forming the head end and the tail end of the sheet-like heat-insulating core material 2, wherein the head end is provided with a head end splicing end 21, and the tail end is provided with a tail end splicing end 22, and the head end splicing end 21 and the tail end splicing end 22 are complementary in shape so as to fit each other during the winding process. Specifically, a plurality of dovetail protrusions of the same shape are provided on the head end splicing end 21, and a plurality of dovetail grooves are provided on the tail end splicing end 22, and the shapes of the dovetail protrusions and the dovetail grooves are complementary to form a splicing structure, that is, in the process of curling the sheet-like heat-insulating core material 2, the dovetail protrusions on the head end and the dovetail grooves on the tail end can just match together, so that the sheet-like heat-insulating core material 2 can be transformed into a "hollow cylindrical" type heat-insulating core material 4.

[0042] In addition, the sheet-like thermal insulation core material 2 also has two relative planes, one of which is surrounded by the interior of the "hollow cylindrical" type thermal insulation core material 4 after winding to form the inner side surface, and the other surface forms the outer side surface. The inner layer packaging film 1 is also attached to the inner side surface, and the outer layer packaging film 3 is attached to the outer side surface. The inner layer packaging film 1 includes an inner layer head end and an inner layer tail end. The inner layer head end has the same shape as the head end splicing end 21 of the sheet-like thermal insulation core material 2 to be bonded, and the inner layer tail end has the same shape as the tail end splicing end 22 of the sheet-like thermal insulation core material 2 to be bonded. As the film is wound, the head and tail ends of the inner layer packaging film 1 are also spliced ​​together. The inner layer packaging film 1 also includes an edge sealing section 11 protruding in the width direction of the thermal insulation pad. The length of the edge sealing section 11 is not less than the thickness of the sheet-like thermal insulation core material 2, so that after the whole is wound, the edge sealing section 11 can be fixed on the axial end surface of the "hollow cylindrical" type thermal insulation core material 4 by turning it outward and gluing it to form a protective layer.

[0043] The outer packaging film 3 is a rectangular film, wherein the width of the outer packaging film 3 is the same as the width of the thermal insulation pad, so that it can be just aligned with the two straight sides of the sheet-like thermal insulation core material 2. The length of the outer packaging film 3 is greater than the length of the thermal insulation pad. One end of the outer packaging film 3 is attached to the tail end close to the sheet-like thermal insulation core material 2, and the other end protrudes from the head end of the outer packaging film 3 to form a covering section 31. When the sheet-like thermal insulation core material 2 is curled into a cylindrical shape, the covering section 31 can stick to and cover the head end splicing end 21 and the tail end splicing end 22, so that the cylindrical structure is maintained without separation. It is worth noting that the inner packaging film and the outer packaging film in this embodiment have a backing adhesive, which is bonded to the sheet-like thermal insulation core material 2 through the backing adhesive. In order to prevent the backing adhesive from being contaminated, a release paper is often provided on the backing adhesive. When bonding is required, the release paper on the packaging film can be removed. The material of the film can be a soft organic film or cloth such as PET film, PEN film, PI film, etc., or a hard metal foil such as copper foil, aluminum foil, tin foil, etc.

[0044] In Example 1 of the method for manufacturing a "hollow cylindrical" type thermal insulation pad of the present invention:

[0045] like Figure 1 As shown, when it is necessary to make a "hollow cylindrical" type thermal insulation pad, the material is first cut, and the cutting includes cutting the sheet-like thermal insulation core material 2 and cutting the inner packaging film 1 and the outer packaging film 3. Specifically, the cutting of the sheet-like thermal insulation core material 2 includes cutting the straight edge of the sheet-like thermal insulation core material 2 to make it have a suitable width, and cutting the head and tail ends of the sheet-like thermal insulation core material 2 to form a head end splicing end 21 and a tail end splicing end 22. The sheet-like thermal insulation core material 2 can be selected from wet fiber felt, needle-punched fiber felt, foam, foam and non-woven fabric with good flexibility, so as to facilitate winding into a cylindrical shape.

[0046] The cutting of the inner packaging film 1 includes the cutting of the release paper on the inner packaging film 1. Specifically, the release paper of the inner packaging film is cut by laser controlled depth cutting or knife controlled depth cutting and the packaging film is kept uncut, so that there is a tangent line on the release paper, that is, a window, which is convenient for partial tearing. Specifically, the window size is the design size of the sheet-like thermal insulation core material 2, and the window does not contain the inner film edge sealing area. Since the release paper covering the window area will be peeled off and fit with the inner side of the sheet-like thermal insulation core material later, the purpose is to prevent the release paper from protecting the adhesive of the inner layer edge sealing section 11 area from being contaminated. The cutting of the outer packaging film 3 is also a window, and the size of the outer packaging film window is also the size of the sheet-like thermal insulation core material 2. At the same time, positioning holes are processed and the corresponding inner layer packaging film edge sealing section area positions on the outer packaging film are cut off. Of course, in order to protect the inner packaging film 1, a carrier film can also be set on the side of the inner packaging film away from the sheet-like insulation core material 2. The viscosity of the two sides of the carrier film is inconsistent, and the viscosity of the carrier film to the inner packaging film 1 is smaller than the other side to facilitate peeling.

[0047] Afterwards, the sheet-like thermal insulation core material 2 and the two layers of packaging films are laminated. First, laminate the inner packaging film 1. Keep the release paper on the edge sealing section 11, peel off the release paper in the window area, and laminate the inner packaging film 1 and the sheet-like thermal insulation core material 2. Place the sheet-like thermal insulation core material 2 with the inner packaging film 1 on the mold with the outer side facing up, keep the release paper on the covering section 31, tear off the release paper on the outer packaging film 3 that needs to be bonded to the sheet-like thermal insulation core material 2, and laminate the outer packaging film 3 on the sheet-like thermal insulation core material 2. Due to the effect of the release paper on the covering section, the covering section 31 will not be laminated to the sheet-like thermal insulation core material at this time. Use the positioning holes on the outer packaging film to cooperate with the mold to avoid misalignment. It is worth noting that the inner packaging film will contact the columnar heating element after molding, so a hot pressing film can be used, and the back glue on the outer packaging film can be a pressure-sensitive adhesive. The inner packaging film needs to be pressed after bonding, and can be hot pressed for 0.3 to 1 min in an environment with a pressure of 0.5 to 1 MPa and a temperature of 60 to 100°C, so that the inner packaging film 1 and the sheet-like thermal insulation core material are more firmly bonded. Of course, this depends on the selected material. If the packaging film itself has a strong bonding ability, pressing is not necessary.

[0048] Before bonding, the inner packaging film is in the state of a whole film, that is, one inner packaging film and one outer packaging film correspond to multiple cut sheet-like thermal insulation core materials, which is convenient for operation during bonding and pressing. In addition, since the thermal insulation pad can be used in smaller batteries or electronic cigarettes with smaller diameters, it is convenient to operate and take it without cutting the inner packaging film and the outer packaging film during bonding and pressing. Then the inner packaging film 1 is cut in the width direction so that each sheet-like thermal insulation core material 2 has a separate inner packaging film 1 and outer packaging film 3. It is worth noting that since the inner packaging film 1 is also provided with an edge sealing section 11 for sealing the side of the sheet-like thermal insulation core material 2, it is necessary to pay attention to retaining the edge sealing section 11 on the inner packaging film 1 when cutting. It is worth noting that there are many ways of cutting. One way is, as described in the present embodiment, to cut off the thermal insulation core material in advance, retain the entire inner packaging film and the outer packaging film, and finally cut off the inner packaging film 1 and the outer packaging film 3. Of course, the inner packaging film 1 and the outer packaging film 3 can also be directly cut during the window opening process to form a sheet packaging film of appropriate size, or only the inner packaging film or only the outer packaging film can be cut.

[0049] Then the sheet-like thermal insulation core material 2 in the above step is wound. Specifically, in order to facilitate winding into a standard cylindrical shape during the winding process, a cylindrical jig is used for winding. The diameter of the inner layer of the sheet-like thermal insulation core material 2 after winding is completed is the same as the outer diameter of the cylindrical jig, so that the inner layer packaging film 1 can be close to the jig during winding and just make the head end splicing end 21 and the tail end splicing end 22 splice. After that, the release paper on the covering section 31 of the outer layer packaging film 3 is torn off, and the head end splicing end 21 and the tail end splicing end 22 of the sheet-like thermal insulation core material 2 are bonded using the covering section 31. At this time, a "hollow cylindrical" type thermal insulation core material 4 is also formed.

[0050] Finally, the edge of the "hollow cylindrical" type heat insulating core material 4 is sealed. The release paper of the edge sealing section 11 on the inner packaging film 1 is torn off, and the edge sealing section 11 is folded outward and pasted to the end of the "hollow cylindrical" type heat insulating core material 4 to complete the edge sealing. Of course, after the edge sealing, the edge sealing can also be hot-pressed using a hot pressing mechanism to improve the bonding ability of the edge sealing section. At this point, a "hollow cylindrical" type heat insulating pad is also obtained.

[0051] The "hollow cylindrical" type thermal insulation pad in the present invention is not limited to the embodiments described above, and there can be a variety of modified embodiments based on the design concept of the present invention.

[0052] In the embodiment 2 of the "hollow cylindrical" type heat insulation pad of the present invention, a new arrangement form is proposed for the setting of the splicing structure. In this embodiment, it is no longer set in a dovetail shape, but is set in a tooth shape for mutual splicing. Of course, in other embodiments, the head and tail ends of the sheet-like heat insulation core material can also be processed into inclined surfaces respectively to be spliced ​​together, or other splicing methods such as cut-off splicing can be used.

[0053] In the embodiment 3 of the "hollow cylindrical" type thermal insulation pad of the present invention, a new arrangement form is proposed for the setting of the protective layer. The difference from the embodiment 1 is that Figure 5-Figure 8As shown, in this embodiment, no edge sealing section is provided, but an edge sealing material is provided separately. Specifically, in this embodiment, the edge sealing material is an annular sealing ring 6, and the sealing ring is provided with an edge sealing for shielding the side of the thermal insulation pad along the axial direction of the "hollow cylinder" type thermal insulation pad, and is blocked by an additionally provided sealing ring 6. Therefore, the inner packaging film 1 and the outer packaging film 3 are the same width as the sheet-like thermal insulation core material 2. At this time, before coiling, multiple inner packaging films 1 can be arranged in parallel on the carrier film 5, and then multiple sheet-like thermal insulation core materials 2 and multiple outer packaging films 3 are placed in sequence, so as to perform batch coiling. Of course, in other embodiments, paint or glue can also be applied to the axial end face of the "hollow cylinder" type thermal insulation core material, and then it can be cured to form a protective layer on the axial end face of the "hollow cylinder" type thermal insulation core material. The curing form can be thermal curing, UV curing or natural curing, etc. The curing method is a prior art and is not described here.

[0054] In the embodiment 4 of the "hollow cylindrical" type heat insulation pad of the present invention, a new arrangement is proposed for the setting of the protective layer. Different from the embodiment 1, an edge sealing section is provided on the outer packaging film in this embodiment. Specifically, when cutting, the size of the outer packaging film is not less than the width of the sheet-like heat insulation core material. When edge sealing is required, the edge sealing section is folded inward. Of course, in other embodiments, edge sealing sections can also be processed on both the inner packaging film and the outer packaging film at the same time.

[0055] In the embodiment 5 of the "hollow cylindrical" type heat insulation pad of the present invention, a new arrangement is proposed for the setting of the inner packaging film. Different from the embodiment 1, in this embodiment, the length of the inner packaging film is less than the length of the sheet-like heat insulation core material, and the head end joint section and the tail end joint section are not covered by the inner packaging film. Of course, in other embodiments, it is also possible to Figure 4 and Figure 5 As shown, the inner packaging film is no longer provided, only the outer packaging film is provided, and the protective layer may also be no longer provided.

[0056] In the second embodiment of the manufacturing method of the "hollow cylindrical" type thermal insulation pad of the present invention, a new arrangement form is proposed for the method of cutting the sheet-like thermal insulation core material. Different from the first embodiment, in the present embodiment, the head and tail sections of the sheet-like thermal insulation core material are cut into tooth shapes for mutual splicing. Of course, in other embodiments, the head and tail ends of the sheet-like thermal insulation core material can also be cut into inclined surfaces for mutual splicing, or other splicing methods such as cutting splicing can be adopted.

[0057] In Example 3 of the manufacturing method of the "hollow cylinder" type thermal insulation pad of the present invention, this embodiment proposes a new arrangement form for the setting of the protective layer. Different from Example 1, in this embodiment, the protective layer is no longer bonded by folding the edge sealing section of the inner packaging film, but a coating or glue is applied to the axial end face of the "hollow cylinder" type thermal insulation core material after winding, and a protective layer is formed after curing. Of course, it is also possible to directly attach the edge sealing to the sheet-like thermal insulation core material before winding, and the protective layer is naturally formed as the winding proceeds. Since it is not necessary to retain the edge sealing during the window opening and cutting process at this time, it can be directly shrunk inward by 0-2mm according to the size of the sheet-like thermal insulation core material 2.

[0058] In Example 4 of the method for manufacturing the "hollow cylindrical" type thermal insulation pad of the present invention, a new arrangement is proposed for cutting the inner packaging film and the outer packaging film. Different from Example 1, in this embodiment, not only the window opening operation is performed, but the release paper and the packaging film are cut together to form independent sheets of packaging film.

[0059] In Example 5 of the manufacturing method of the "hollow cylindrical" type thermal insulation pad of the present invention, this embodiment proposes a new arrangement for the formation of the edge sealing section. Different from Example 1, in this embodiment, the edge sealing section is retained on both the inner packaging film and the outer packaging film. When the edge sealing process is performed, the inner packaging film is folded outward and the outer packaging film is folded inward. Of course, in other embodiments, the edge sealing section may not be provided on the inner packaging film, but only on the outer packaging film. Of course, the edge sealing section may not be provided.

[0060] In Example 6 of the manufacturing method of the "hollow cylindrical" type thermal insulation pad of the present invention, this embodiment proposes a new arrangement form for the bonding of the inner packaging film. Different from Example 1, in this embodiment, the ends of the inner packaging film no longer match the shapes of the ends of the "hollow cylindrical" type thermal insulation core material but are shorter, that is, the inner layer no longer attaches the ends. Of course, in other embodiments, the inner packaging film may not be provided.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A "hollow cylinder" type thermal insulation pad, characterized in that: It includes a "hollow cylindrical" type insulation core material formed by splicing the ends of a sheet-like insulation core material after winding, and also includes an outer packaging film that is pasted and fixed to the outer side of the sheet-like insulation core material to be wound into a cylindrical structure together with the sheet-like insulation core material. The outer packaging film has covering sections that cover the ends of the "hollow cylindrical" type insulation core material.

2. The "hollow cylindrical" type thermal insulation pad according to claim 1, characterized in that: The "hollow cylindrical" type thermal insulation pad also includes an inner packaging film that is adhered and fixed to the inner side of the sheet-like thermal insulation core material so as to be wound together with the sheet-like thermal insulation core material into a cylindrical structure.

3. The "hollow cylinder" type thermal insulation pad according to claim 2, characterized in that: The inner packaging film is spliced ​​at both ends, and the shapes of the inner packaging film are adapted to the shapes of the "hollow cylindrical" type heat insulation core material.

4. The "hollow cylindrical" type thermal insulation pad according to claim 2 or 3, characterized in that: The axial ends of the outer packaging film of the tubular structure and / or the inner packaging film of the tubular structure are provided with edge sealing sections for being pasted and fixed on the axial end surface of the "hollow cylindrical" type heat insulation core material after being folded.

5. The "hollow cylindrical" type thermal insulation pad according to any one of claims 1 to 3, characterized in that: The "hollow cylinder" type thermal insulation pad also includes a protective layer fixed on the axial end surface of the "hollow cylinder" type thermal insulation core material.

6. A method for manufacturing a "hollow cylindrical" type thermal insulation pad, characterized in that: The method comprises the following steps: firstly, cutting the sheet-like thermal insulation core material and the outer packaging film into suitable shapes and sizes, reserving a covering section on the outer packaging film during the cutting process, and then pasting and fixing the outer packaging film on the outer side of the sheet-like thermal insulation core material, and then winding the two so that the head and tail ends of the sheet-like thermal insulation core material are spliced ​​into a "hollow cylindrical" type thermal insulation core material, and the outer packaging film is rolled together with the sheet-like thermal insulation core material into a cylindrical structure, and finally the head and tail ends of the "hollow cylindrical" type thermal insulation core material are covered and pasted with the covering section of the outer packaging film.

7. The method for manufacturing the "hollow cylindrical" type thermal insulation pad according to claim 6, characterized in that: The manufacturing method of the "hollow cylindrical" type insulation pad also includes the process of cutting the inner packaging film into a suitable shape and size, and after cutting, the inner packaging film is pasted and fixed on the inner side of the sheet-like insulation core material so that the inner packaging film is rolled into a cylindrical structure together with the sheet-like insulation core material.

8. The method for manufacturing the "hollow cylinder" type thermal insulation pad according to claim 7, characterized in that: The inner packaging film is spliced ​​at both ends. When the inner packaging film is cut, the shapes of the inner packaging film at both ends are cut to match the shapes of the "hollow cylindrical" type insulation core material at both ends.

9. The method for manufacturing the "hollow cylindrical" type thermal insulation pad according to claim 7 or 8, characterized in that: When cutting the inner packaging film and / or the outer packaging film, reserve edge sealing sections at the axial ends of the inner packaging film and / or the outer packaging film that are about to be wound into a cylindrical structure, so that the edge sealing sections can be folded and glued to the axial end faces of the "hollow cylindrical" type insulation core material that are about to be wound before winding, or the edge sealing sections can be folded and glued to the axial end faces of the "hollow cylindrical" type insulation core material after winding.

10. The method for manufacturing the "hollow cylinder" type thermal insulation pad according to claim 9, characterized in that: When cutting the inner packaging film and / or the outer packaging film, cut the release paper between the portion of the inner packaging film and / or the outer packaging film that is to be pasted to the sheet-like insulation core material and the edge sealing section; when cutting the outer packaging film, cut the release paper between the portion of the outer packaging film that is to be pasted to the sheet-like insulation core material and the covering section.

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