• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    - Semi-produced composite material comprising a thermoplastic or thermosetting matrix and reinforcing fillers. The semi-product comprises an electromagnetic shielding film positioned in the thickness of the semi-finished product, the electromagnetic shielding film having orifices.
    公开号:FR3015924A1
    申请号:FR1363671
    申请日:2013-12-30
    公开日:2015-07-03
    发明作者:Gerald Andre；Hugues Cheron
    申请人:Plastic Omnium SA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to the technical field of plastic products. In particular the invention relates to a composite (semi-produced) material having an electromagnetic shielding property for manufacturing a box for encapsulating electrical systems, such as batteries, on vehicles. To encapsulate a set of batteries for hybrid or electric vehicles, the solution often used today is a box made entirely of metal, especially aluminum. The choice of this metal is justified for its mechanical strength and the electromagnetic shielding properties which are essential for confining the large fields generated by the batteries and other electrical components. However, the metal boxes increase the weight of the vehicle in which they are installed and do not have electrical insulation to the outside. In addition, they may present a potential danger to users. Finally, the metal boxes have only a low thermal insulation, incompatible with the maintenance and control of the internal temperatures of the batteries vis-à-vis external variations. To overcome this problem of weight, it is known to use boxes made at least partly of polymeric or composite materials, of the type comprising a thermoplastic or thermosetting resin and reinforcing fibers. To give these caissons made partly of composite materials an electromagnetic shielding property, it is also known the following methods: metallization by conductive paint: this solution does not prove sufficiently effective in the ranges of frequency and power concerned by onboard battery systems on vehicles; overmolding of metal grids, wire cloths or expanded metal: this method has the advantage of being integrable in a molding process. Indeed, the metal layers can be stretched to fit the shapes of the piece. However, this solution also proves to be insufficient in shielding efficiency, even though the thicknesses can be increased and thus be relatively effective in the low frequencies, essentially because of the openings and discontinuities between the meshs for the fabrics; surface treatment by metallization, for example by spraying molten metal or by electrolytic deposition of Zn, Cu or Al: this process seems to be effective. However, this process may require large deposit thicknesses. This poses significant problems in terms of processing processes, cycle times and industrial resources to deploy in order to keep pace with automobiles; the use of particular metals, called "mu metals", with significant magnetic properties, generally obtained by ferrous materials with high levels of nickel. These metals are known to act very effectively on low frequency electromagnetic fields. This solution is the most adapted to the vehicle. However, it exhibits saturation effects as a function of the power of the magnetic field, especially at a higher frequency, and it must therefore again be used in great thickness to compensate for this phenomenon, which very quickly raises problems of mass because these materials have a higher density than steel. Moreover, it is known in the scientific literature, the advantage of a multilayer effect: the shielding being very effective on the surfaces of the screens rather than heart.
    [0002] The invention aims to overcome these disadvantages by providing a semi-product for making a box adapted to the needs of vehicles in terms of shape and volume exploitation, while ensuring an electromagnetic shielding behavior. To do this, the semi-finished product according to the invention comprises a thermoplastic or thermosetting matrix and reinforcing fillers, as well as at least one electromagnetic shielding film positioned in the thickness of the semi-finished product, the electromagnetic shielding film comprising orifices. The semi-finished product according to the invention allows a saving in mass for the entire solution (complete box encapsulating the batteries of a vehicle and integrating the shielding), compared to metallic or composite solutions with metallic projection. In addition, the method of manufacturing a box can be made in continuous flow and in high rates. Preferably, the total area of the orifices is much smaller than the surface of the material forming the electromagnetic shielding film. According to the invention, the electromagnetic shielding film may be perforated at regular intervals, and may not be flat. Preferably, the electromagnetic shielding film is a flexible metal film, or a metallized film. The electromagnetic shielding film may for example be an aluminum film. According to one embodiment, the electromagnetic shielding film is positioned on the surface of the semi-finished product. The semi-product may be in the form of a sheet, and the electromagnetic shielding film may be embedded in the thickness of the sheet. But, the electromagnetic shielding film may also be interposed between two sheets of composite material, forming a flexible core. The semi-product may contain at least one layer having two electromagnetic shielding films separated by an electrically insulating medium. The semi-finished product may comprise several bands of electromagnetic shielding films, the strips having a non-zero overlap. The strips may be coated with resin and / or a chemically compatible product with a resin of the thermoplastic or thermosetting matrix. The invention also relates to an accommodation housing equipment onboard storage and / or transmission of electrical power drive motor vehicle, the box describing a surface completely enclosing a housing for receiving such equipment. This box is made with the semi-finished product according to the invention. The invention also relates to a method of manufacturing a part by molding, in which several strips of the semi-finished product according to the invention are used, and the strips are arranged so that after molding, the the whole part in a direction normal to the surfaces of the part, is covered with at least one thickness of electromagnetic shielding film. According to the invention, the part may be an on-board housing housing for storing and / or transmitting electric drive power of a motor vehicle, and the following steps are carried out using a mold of the following type: punch-matrix: one of the walls of the mold is provided with several strips of the semi-finished product (SP) according to the invention, so that the entire surface of the box is covered by the electromagnetic shielding film (FBE) after opening the mold; the mold is closed, and a pressure and a temperature chosen chosen to allow creep and polymerization of the thermoplastic or thermosetting matrix, so that the matrix ensures cohesion by passing through the orifices (ORI) of the shielding film electromagnetic (FBE); and the casing thus obtained is demolded. The entire surface of the box may be covered by the electromagnetic shielding film after opening the mold, by strips of semifunctional semi-product and overlapping each other. Finally, the overlap between each band is preferably 30 to 40mm minimum. The invention will be better understood on reading the appended figures, which are provided by way of example and are not limiting in nature, in which: FIG. 1 represents an embodiment of the semi-finished product according to the invention.
    [0003] Figure 2 illustrates the use of an insulating medium electrically interposed between two shielding films. Figure 3 illustrates an embossed shielding film and its use during molding. Figure 4 illustrates the method of arranging semi-finished product web to form a finished product without electromagnetic leakage.
    [0004] The invention relates to a semi product (SP), illustrated in Figure 1, and comprising: A composite material (MC) comprising: a thermoplastic or thermosetting matrix (PP, PA, UP or VE); o fibrous reinforcing fillers (glass, natural fibers, carbon, etc.); and / or reinforcing fillers in powder form such as calcium carbonate.
    [0005] At least one electromagnetic shielding film (FBE) positioned in the thickness of the semi-finished product, and comprising a set of orifices (ORI). The orifices (ORI) of the electromagnetic shielding film (FBE) ensure cohesion between the composite material (MC) and the shielding film (FBE). Indeed, when molding a part from a semi-finished product (SP) according to the invention, the material (FLU) passes through the orifices (ORI) before curing. Orifice size (ORI) is minimized to ensure electromagnetic shielding. But a compromise can be determined to further minimize the weight of the finished part made from the semi-finished product. Unlike a grid, the total area of the orifices (ORI) is much smaller than the surface area of the shielding film material. Preferably, the electromagnetic shielding film (FBE) is perforated at regular intervals, so as to provide homogeneous cohesion. The electromagnetic shielding film (FBE) may be a metal film. Preferably, the film is flexible, so as to provide only an electromagnetic shielding function while limiting the weight of the finished part, and not a reinforcing function of the semi-finished product. The shielding film (FBE) is preferably made of aluminum. It has a thickness preferably between 0.1 and 0.5 mm. The electromagnetic shielding film (FBE) may also be a metallized film made from a substrate compatible with the composite materials used. According to one embodiment, the electromagnetic shielding film (FBE) is not flat, but has folds. For example, and as illustrated in FIG. 3, a film may have an embossing shape, in the form of concentric circular pyramids for example. This configuration makes it possible to accompany the creep (FLU) of the composite material during molding, as illustrated in FIG. 3, because the film "unfolds". This allows among other things to avoid tearing of the film.
    [0006] Preferably, the semi-finished product (SP) according to the invention is prepared in the form of a plate (possibly in roll), comprising one or more sheets of composite material. According to a first embodiment, the shielding film (FBE) is embedded in the thickness of a sheet of composite material.
    [0007] According to a second embodiment, the semifinished composite material incorporating a shielding film comprises: a first sheet of composite material; A second sheet of composite material; A flexible metal or metallized film interposed between the two sheets of composite material, and forming a flexible core, and perforated at regular intervals. The advantage of these two embodiments and provide protection to the shielding film against aggression or corrosion. In addition, the shielding system obtained is not conductive on the surface of the room. This avoids the risk of contact with 20 elements under tension. However, according to one variant, the shielding film (FBE) is positioned on the surface of a sheet of composite material. According to one embodiment, the semi-finished product (SP) according to the invention comprises several shielding films (FBE). These films may have different compositions and / or thicknesses and / or shapes. According to another embodiment (FIG. 2), the semi-finished product (SP) includes at least one layer comprising two electromagnetic shielding films (FBE) according to the invention separated by an electrically insulating medium (ISO) (consisting of polymer by example) as illustrated in FIG. 2. The semi-finished product (SP) according to the invention may comprise one or more of these layers, in combination or not with other shielding films (FBE). The insulating medium (ISO) can also be perforated in the same way as the electromagnetic shielding films (FBE). The invention also relates to an accommodation housing equipment onboard storage and / or transmission of electrical power drive 35 of a motor vehicle. The box describes a surface completely enclosing a housing for receiving such equipment. The box is made with the semi-finished product (SP) according to the invention.
    [0008] The invention also relates to a method of manufacturing a box for encapsulating on-board battery systems on vehicles. To mold a part, such as a box, from the semi-finished product according to the invention, one uses several strips of semi-finished product which is arranged so that after molding the whole of the part, in a direction normal to the surfaces of the part, is covered with at least one thickness of electromagnetic shielding film (FBE). Thus, the piece does not include any breakage of the shielding film, this to prevent electromagnetic field leakage. Advantageously, the semi-product may already comprise several bands (BAND) electromagnetic shielding film (FBE) with a non-zero overlap, to facilitate this dressing operation of the form of the tool (OUT). This configuration is illustrated in FIG. 4. This tool (OUT) is either a mold that can transform the workpiece under pressure or a shape that makes it possible to make a preform with the semi-finished product before loading it into a mold. Advantageously, during the production of the semi-finished product, the strips are coated with resin or a product chemically compatible with the resin used, in order to facilitate their sliding during the process of transforming the part, and to facilitate the cohesion in the coating. the thickness of the piece. According to one example, in order to produce the part (box) according to the invention, a punch-die type mold is used, for example, and the following steps are carried out: a plurality of strips of the semi-finished product are placed on the wall of the punch of the mold. (SP) according to the invention, so that the entire surface of the box is covered by the electromagnetic shielding film after opening the mold, and that the entire shape in a direction normal to the surfaces of the part is covered with at least one thickness of shielding film. These bands are positioned by overlapping each other. The overlaps are dimensioned and positioned so that after closure of the die portion, the strips slide to form the part and the entire surface of the part is covered by the discontinuous strip electromagnetic shielding film. In one example, the overlap between each band is 30 to 40mm minimum. the mold is closed, and a pressure and a temperature chosen chosen to allow creep and polymerization of the thermoplastic or thermosetting matrix. It is possible to apply a low pressure (less than 20 bar), but advantageously a high pressure (greater than 80 bar) is applied so that the composite material flows into the cavity and ensures cohesion by passing through the orifices. electromagnetic shielding film. the part thus obtained is demolded.
    [0009] According to one embodiment, in order to guarantee the presence of the film at the workpiece edge, the impression of the mold is provided larger than the finished part. The manufacturing is then completed by a cutting operation of the mold outlet part.
    权利要求:
    Claims (17)
    [0001]
    REVENDICATIONS1. Semi-finished product (SP) made of composite material (MC) comprising a thermoplastic or thermosetting matrix and reinforcing fillers, characterized in that it comprises at least one electromagnetic shielding film (FBE) positioned in the thickness of the semi-finished product (SP), the electromagnetic shielding film (FBE) having orifices (ORI).
    [0002]
    The semi-finished product according to claim 1, wherein the total area of the orifices (ORI) is much smaller than the area of the electromagnetic shielding film (FBE) material.
    [0003]
    3. Semi-product according to one of the preceding claims, wherein the electromagnetic shielding film (FBE) is perforated at regular intervals.
    [0004]
    4. Semi-product according to one of the preceding claims, wherein the electromagnetic shielding film (FBE) is not plane.
    [0005]
    5. Semi-product according to one of the preceding claims, wherein the electromagnetic shielding film (FBE) is a flexible metal film, or a metallized film.
    [0006]
    The semi-finished product according to claim 5, wherein the electromagnetic shielding film (FBE) is an aluminum film.
    [0007]
    7. Semi-product according to one of the preceding claims, wherein the electromagnetic shielding film (FBE) is positioned on the surface of the semi-finished product.
    [0008]
    8. Semi-product according to one of claims 1 to 6, wherein the semi-finished product (SP) is in the form of a sheet, and the electromagnetic shielding film (FBE) is embedded in the thickness of the sheet. .
    [0009]
    9. Semi-product according to one of claims 1 to 6, wherein the electromagnetic shielding film (FBE) is interposed between two sheets of composite material (MC), forming a flexible core.
    [0010]
    10. Semi-product according to one of the preceding claims, containing at least one layer comprising two electromagnetic shielding films (FBE) separated by an electrically insulating medium (IS0).
    [0011]
    11. Semi-product according to one of the preceding claims, comprising several bands (BAND) of electromagnetic shielding films (FBE), the bands having a non-zero overlap.
    [0012]
    The semi-finished product according to claim 11, wherein the strips (BAND) are coated with resin and / or a product chemically compatible with a resin of the thermoplastic or thermosetting matrix.
    [0013]
    13. Accommodation housing of onboard storage equipment and / or transmission of electrical power drive motor vehicle, the box describing a surface completely enclosing a housing for receiving such equipment, characterized in that the housing is made with the semi-product (SP) according to one of the preceding claims.
    [0014]
    14. A method of manufacturing a part by molding, characterized in that one uses several bands of the semi-finished product (SP) according to one of claims 1 to 12, and the bands are arranged so that after molding, the entire part in a direction normal to the surfaces of the part is covered with at least one electromagnetic shielding film (FBE) thickness.
    [0015]
    15. The method of claim 14, wherein the part is an accommodation housing of equipment for storing and / or transmitting electrical drive power of a motor vehicle, and the following steps are carried out by means of a punch-die type mold: one of the walls of the mold has several strips of the semi-finished product (SP) according to one of claims 1 to 12, so that the entire surface of the box is covered by the electromagnetic shielding film (FBE) after opening the mold; the mold is closed, and a pressure and a temperature chosen chosen to allow creep and polymerization of the thermoplastic or thermosetting matrix, so that the matrix ensures cohesion by passing through the orifices (ORI) of the electromagnetic shielding film (FBE); and the casing thus obtained is demolded.
    [0016]
    16. The method of claim 15, wherein the entire surface of the box is covered by the electromagnetic shielding film (FBE) after opening the mold, by strips of semi discontinuous product and overlapping with each other.
    [0017]
    17. The method of claim 16, wherein the overlap between each band is 30 to 40mm minimum.
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    同族专利:
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    US20160330879A1|2016-11-10|
    FR3015924B1|2016-08-05|
    CN106170385B|2018-09-14|
    US10194568B2|2019-01-29|
    EP3089864B1|2020-09-23|
    引用文献:
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    EP1099541A1|1998-05-26|2001-05-16|Takeda Chemical Industries, Ltd.|Material for molding thermosetting resin sheet, production process, and molded product|
    US20100239798A1|2009-03-17|2010-09-23|Environmental Container Systems, D/B/A Ecs Composites|Electromagnetic compatible containers|
    EP2647486A1|2010-12-02|2013-10-09|Toray Industries, Inc.|Method for producing metal composite, and chassis for electronic equipment|
    CN1236529C|2001-08-28|2006-01-11|财团法人工业技术研究院|Back electromagnetic shielding element for electronic connector|
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    KR101912542B1|2017-10-25|2019-01-14|크린앤사이언스|lectro Magnetic Shielding Materials Using Perforated Metal Foil and Process for Producing The Same|
    CN109466405A|2018-12-03|2019-03-15|航天科工武汉磁电有限责任公司|A kind of multi-functional shelter of lightweight and its forming method|
    CN111086237A|2019-11-22|2020-05-01|江苏恒神股份有限公司|Forming method of carbon fiber composite material flow guide shell|
    法律状态:
    2015-12-23| PLFP| Fee payment|Year of fee payment: 3 |
    2016-12-26| PLFP| Fee payment|Year of fee payment: 4 |
    2017-12-19| PLFP| Fee payment|Year of fee payment: 5 |
    2019-12-30| PLFP| Fee payment|Year of fee payment: 7 |
    2020-12-24| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1363671A|FR3015924B1|2013-12-30|2013-12-30|SEMI-COMPOSITE MATERIAL COMPRISING A FLEXIBLE ELECTROMAGNETIC SHIELDING FILM|FR1363671A| FR3015924B1|2013-12-30|2013-12-30|SEMI-COMPOSITE MATERIAL COMPRISING A FLEXIBLE ELECTROMAGNETIC SHIELDING FILM|
    CN201480075163.4A| CN106170385B|2013-12-30|2014-12-22|Include the composite semi-finished products of flexible electromagnetic shielding film|
    US15/108,805| US10194568B2|2013-12-30|2014-12-22|Semi-finished product made from composite material, comprising a flexible electromagnetic shielding film|
    PCT/FR2014/053512| WO2015101739A1|2013-12-30|2014-12-22|Semi-finished product made from composite material, comprising a flexible electromagnetic shielding film|
    EP14833517.7A| EP3089864B1|2013-12-30|2014-12-22|Semi-finished product made from composite material, comprising a flexible electromagnetic shielding film|
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