CN117863608A - PTC battery heating film, preparation method thereof and hot-pressing preparation device - Google Patents
PTC battery heating film, preparation method thereof and hot-pressing preparation device Download PDFInfo
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- CN117863608A CN117863608A CN202311854504.5A CN202311854504A CN117863608A CN 117863608 A CN117863608 A CN 117863608A CN 202311854504 A CN202311854504 A CN 202311854504A CN 117863608 A CN117863608 A CN 117863608A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 106
- 238000007731 hot pressing Methods 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000002131 composite material Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000011347 resin Substances 0.000 claims abstract description 19
- 229920005989 resin Polymers 0.000 claims abstract description 19
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- 239000011231 conductive filler Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 238000005530 etching Methods 0.000 claims abstract description 9
- 229920000307 polymer substrate Polymers 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000008187 granular material Substances 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims description 19
- 239000011159 matrix material Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 239000011265 semifinished product Substances 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 239000004812 Fluorinated ethylene propylene Substances 0.000 claims description 2
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 claims description 2
- 229920009441 perflouroethylene propylene Polymers 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract 1
- 239000011324 bead Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/145—Carbon only, e.g. carbon black, graphite
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/146—Conductive polymers, e.g. polyethylene, thermoplastics
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/26—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment
- C08J2323/28—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment by reaction with halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/16—Homopolymers or copolymers of vinylidene fluoride
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of heating films, in particular to a PTC battery heating film, a preparation method and a hot-pressing preparation device thereof, wherein granules of a multi-component polymer substrate and conductive filler are added into mixing equipment for smelting, a multi-component resin substrate reaches a semi-molten state, conductive filler powder is added, so that the powder has a relatively high dispersion speed, the damage of mechanical friction to a powder structure is reduced, PTC composite slurry is obtained through smelting, the PTC composite slurry is extruded and molded to obtain a PTC heating film, the PTC heating film is conveyed by a hot-pressing roller set, the conductive film is thermally pressed and bonded to form a composite film, the upper conductive film is etched into a strip-shaped conductive strip through an etching process, the PTC battery heating film and the conductive film are finally packaged to obtain the PTC battery heating film through the whole hot-pressing bonding, and the conductive strip is etched through the etching process, so that the bonding strength of the conductive film and the PTC composite material can be ensured, and the flexible design of a circuit can be realized, and the process route is simple and efficient.
Description
Technical Field
The invention relates to the technical field of heating films, in particular to a PTC battery heating film, a preparation method thereof and a hot-pressing preparation device.
Background
The battery pack of the new energy automobile has a severe requirement on the temperature of the use environment, therefore, the prior art usually adopts structures such as heating wires, heating films and the like, so as to adapt to the narrow space in an automobile battery module, especially the battery heating film made of a PTC composite material, the PTC characteristic can be used as a self-limiting temperature heating material to achieve the function of automatically adjusting the temperature, and the temperature control requirement of an automobile power battery is well met, however, the preparation method of the traditional PTC battery heating film, such as the heating film material with the PTC effect and the preparation method thereof disclosed in the Chinese patent document CN110611964A, the preparation method of the PTC heating film disclosed in the CN116685066A and the like, adopts a paste coating and baking mode to prepare the composite heating film, has weaker bonding force, needs to form a conductive film strip through a more complex process route, and has lower preparation efficiency.
Disclosure of Invention
In view of the above, the present invention aims to provide a PTC battery heating film, a preparation method thereof and a hot pressing preparation apparatus thereof, so as to solve the problems of weak adhesion and low preparation efficiency between composite films in the preparation of the conventional PTC battery heating film.
Based on the above object, the present invention provides a method for preparing a PTC battery heating film, comprising the steps of:
adding granules of a multi-component polymer substrate and conductive fillers into mixing equipment for smelting, wherein the multi-component polymer substrate comprises a multi-component resin matrix, controlling the smelting process temperature to be within a range between the melting point temperatures of the resin matrix of each component so as to enable the multi-component resin matrix to reach a semi-molten state, adding the conductive fillers, smelting to obtain PTC composite slurry, and extruding and molding the PTC composite slurry through an extruder to obtain a PTC heating film;
the extruded PTC heating film is rolled by a hot press roller set, and a conductive film is bonded on the upper layer of the PTC heating film in a hot press mode to form a composite film;
cutting the composite film to form a fixed specification, etching the upper conductive film into a strip conductive belt by an etching process, and packaging electrodes and connecting wires at the end parts of the conductive belt to prepare a PTC battery heating film semi-finished product;
and (3) bonding and packaging insulating films on two sides of the PTC battery heating film semi-finished product, and exposing the lead to obtain the PTC battery heating film finished product.
Preferably, the multicomponent resin matrix comprises at least two of polyethylene, polypropylene, polyvinylidene fluoride, fluorinated ethylene propylene, and the conductive filler comprises one or more of conductive carbon black, carbon nanotubes, graphite, graphene, and metal powder.
Preferably, the hot pressing temperature of the hot pressing roller group is between 17 ℃ and 23 ℃ below the melting point of the PTC heating film.
Preferably, the insulating film includes an inner PI film and an outer PI film.
The invention also provides a PTC battery heating film which is prepared by the preparation method of the PTC battery heating film.
The invention also provides a hot-pressing preparation device of the PTC battery heating film, which comprises an extruder for extruding the PTC heating film, wherein one side of the discharge end of the extruder is provided with a hot-pressing roller group for hot-pressing and bonding the PTC heating film and the conductive film:
the hot press roller group comprises a roller group frame, an upper hot press roller and a lower hot press roller are rotationally connected to the roller group frame, the upper hot press roller and the lower hot press roller are vertically symmetrically arranged, a discharging roller is rotationally connected to the roller group frame, a conductive film is wound on the discharging roller, one side of the roller group frame, which is close to the upper hot press roller, is rotationally connected with a first conductive roller, one side of the roller group frame, which is close to the lower hot press roller, is rotationally connected with a second conductive roller, a conductive film is conveyed to the bottom end of the upper hot press roller through the discharging roller and the first conductive roller, a PTC heating film is conveyed to the top end of the lower hot press roller through the second conductive roller, the upper hot press roller and the lower hot press roller are relatively rotated for hot press adhesion of the PTC heating film and the conductive film, a movable pressing bar component is arranged at a gap between the PTC heating film and the conductive film on the roller group frame, one end of the movable pressing bar component is respectively abutted to the opposite sides of the PTC heating film and the conductive film, and when the thickness of the PTC heating film is changed, the conductive film is abutted to the conductive film through the movable pressing bar component, and the distance of the conductive film relative to the upper hot press roller is adapted and adjusted.
Preferably, the movable layering subassembly is including connecting in the extension frame that roller set frame is close to extruder one side, be connected with upper shaft pole and lower axostylus axostyle on the extension frame, upper shaft pole, lower axostylus axostyle and upper hot press roller, lower hot press roller looks parallel arrangement, the cover is equipped with movable sleeve in proper order on the upper shaft pole along its axial direction, the cover is equipped with movable sleeve down in proper order on the lower axostylus axostyle on the telescopic outer wall of upper movable, fixedly connected with down the layering on the telescopic outer wall of lower movable, the layering divide into the upper strip portion of being connected in movable sleeve's urceolus wall one side on upper movable, and the last short strip portion of being connected in movable sleeve's urceolus wall one side on lower movable sleeve on the other side on lower, be connected with the stay cord between upper short strip portion and the short strip portion down, the stay cord is tensioning state, so that upper layering, lower layering is the splayed shape of opening orientation hot press roller set, the one end butt of upper strip portion is in the conducting film, the one end butt of lower strip portion is in the PTC membrane butt.
Preferably, a main adjusting screw rod is connected to one side of the extension frame facing the extruder in a threaded engagement manner, and a push rod is connected to one end of the main adjusting screw rod penetrating into the inner side of the extension frame and used for pushing each pull rope.
Preferably, the lower short strip part is arranged to be of a hollow structure, the internal thread of the lower short strip part is connected with an auxiliary adjusting screw in a meshed manner, a through hole is formed in the side end of the lower short strip part, and one end of the pull rope penetrates into the lower short strip part through the through hole and is connected with the auxiliary adjusting screw.
Preferably, the thread section of the auxiliary adjusting screw is positioned at the bottom end of the auxiliary adjusting screw penetrating into the lower short strip part and is meshed with the lower short strip part through the thread section, a swivel is sleeved on the upper part of the thread section of the auxiliary adjusting screw, and one end of a pull rope is connected to the swivel.
The invention has the beneficial effects that: the method comprises the steps of adding granules of a multi-component polymer substrate and conductive filler into mixing equipment for smelting, wherein the mixing process adopts a step-by-step feeding mode, a multi-component resin matrix reaches a semi-molten state, conductive filler powder is added, so that the powder has a relatively high dispersion speed, damage of mechanical friction to a powder structure is reduced, PTC composite slurry is obtained through smelting, the PTC composite slurry is extruded and molded through an extruder to obtain a PTC heating film, the extruded PTC heating film is conveyed through a hot-press roller set, a conductive film is thermally and thermally bonded on the upper layer of the PTC heating film to form a composite film, the composite film is sheared to be in a fixed specification, the conductive film on the upper layer is etched into a strip-shaped conductive belt through an etching process, electrodes and connecting wires are packaged at the end parts of the conductive belt to form a semi-finished PTC battery heating film, insulating films are bonded and packaged on the two sides of the semi-finished PTC battery heating film to expose the wires, the PTC battery heating film finished product is obtained, the PTC heating film and the whole surface of the PTC heating film and the conductive belt, namely the design thought of an electrode circuit is etched through the etching process, so that the bonding strength of the conductive film and the PTC composite film can be ensured, and the circuit can be simply and flexibly designed.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view showing the overall structure of a PTC battery heating film of the present invention;
FIG. 2 is a schematic view of the structure of the heat roller set of the present invention;
FIG. 3 is a schematic view of the structure of the movable molding assembly of the present invention;
FIG. 4 is a schematic top view of the upper molding of the present invention;
FIG. 5 is an enlarged schematic view of FIG. 3A in accordance with the present invention;
FIG. 6 is a schematic view of the structure of the flight section and swivel of the secondary adjusting screw of the present invention;
FIG. 7 is a schematic view of the lower strip portion of the present invention rotated upward by being pressed against;
FIG. 8 is a schematic top view of the main adjusting screw and push rod of the present invention;
fig. 9 is a schematic top view of the extruder of the present invention extruding PTC heating film;
wherein the dashed arrows represent the flow direction of the PTC composite paste.
Marked in the figure as:
101. a PTC heating film; 102. a conductive film; 2. an extruder; 3. a roller set frame; 4. a hot press roller is arranged; 5. a lower hot press roll; 6. a discharging roller; 7. a first guide roller; 8. a second guide roller; 9. a movable batten assembly; 10. an extension frame; 91. an upper shaft lever; 92. a lower shaft lever; 93. an upper movable sleeve; 94. a lower movable sleeve; 95. an upper pressing bar; 951. an upper strip portion; 952. an upper short strip part; 96. a lower pressing bar; 961. a lower strip portion; 962. a lower short strip portion; 97. a pull rope; 11. a main adjusting screw; 12. a push rod; 13. a secondary adjusting screw; 131. a threaded section; 132. a swivel; 14. and a through hole.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
A preparation method of a PTC battery heating film comprises the following steps:
adding granules of a multi-component polymer substrate and conductive fillers into mixing equipment for smelting, wherein the multi-component polymer substrate comprises a multi-component resin matrix, controlling the smelting process temperature to be within a range between the melting point temperatures of the resin matrix of each component so as to enable the multi-component resin matrix to reach a semi-molten state, adding the conductive fillers, smelting to obtain PTC composite slurry, and extruding and molding the PTC composite slurry through an extruder to obtain the PTC heating film 101;
the extruded PTC heating film 101 is rolled by a hot press roller group, and a conductive film 102 is bonded on the upper layer of the PTC heating film 101 in a hot press mode to form a composite film;
cutting the composite film to form a fixed specification, etching the upper conductive film 102 into a strip conductive belt by an etching process, and packaging electrodes and connecting wires at the end parts of the conductive belt to prepare a PTC battery heating film semi-finished product;
and (3) bonding and packaging insulating films on two sides of the PTC battery heating film semi-finished product, and exposing the lead to obtain the PTC battery heating film finished product.
The method comprises the steps of mixing, adding a multi-component resin matrix, controlling the smelting process temperature to be in a range between the melting points of the resin matrix of each component, namely controlling the smelting process temperature to be above the melting point of the resin A and below the melting point of the resin B, so that the multi-component resin matrix is in a semi-molten state, adding conductive filler powder, enabling the powder to have a high dispersion speed, reducing damage of mechanical friction to a powder structure, smelting to obtain PTC composite slurry, passing the PTC composite slurry through an extruder, preferably adopting an existing screw extruder, extruding and molding to obtain a PTC heating film 101, wherein the multi-component resin matrix comprises at least two of polyethylene, polypropylene, polyvinylidene fluoride and fluorinated ethylene, the conductive filler comprises one or more of conductive carbon black, carbon nano tubes, graphite, graphene and metal powder, the conductive film 102 adopts a metal foil film, for example, the insulating film comprises an inner PI film and an outer PI film, the hot-pressing temperature of a hot-pressing roller group is 17 ℃ to 23 ℃ below the melting point of the PTC heating film 101, and the conductive filler film 102 is etched to form a conductive tape through a conductive circuit, and the conductive tape is designed to realize a flexible bonding process, and the PTC composite electrode material is realized.
The invention also provides a PTC battery heating film, which is shown in figure 1 and is prepared by the preparation method.
The invention also provides a hot-pressing preparation device of the PTC battery heating film, which is based on the existing copper-plastic composite extrusion production line and comprises an extruder 2 for extruding the PTC heating film 101, wherein one side of the discharge end of the extruder 2 is provided with a hot-pressing roller group for hot-pressing and bonding the PTC heating film 101 and the conductive film 102, as shown in figures 2, 3, 4, 5, 6, 7 and 8, the hot-pressing roller group comprises a roller group frame 3, an upper hot-pressing roller 4 and a lower hot-pressing roller 5 are rotationally connected on the roller group frame 3, the upper hot-pressing roller 4 and the lower hot-pressing roller 5 are vertically symmetrically arranged, a discharging roller 6 is rotationally connected on the roller group frame 3, the conductive film 102 is wound on the discharging roller 6, one side of the roller group frame 3 close to the upper hot-pressing roller 4 is rotationally connected with a first material guiding roller 7, one side of the roller group frame 3 close to the lower hot-pressing roller 5 is rotationally connected with a second material guiding roller 8, the conductive film 102 is conveyed to the bottom end of the upper hot press roller 4 through the discharging roller 6 and the first conductive roller 7, the PTC heating film 101 is conveyed to the top end of the lower hot press roller 5 through the second conductive roller 8, the upper hot press roller 4 and the lower hot press roller 5 rotate relatively and are used for hot press adhesion of the PTC heating film 101 and the conductive film 102, a movable pressing strip assembly 9 is arranged at a gap between the PTC heating film 101 and the conductive film 102 on the roller set frame 3, one end of the movable pressing strip assembly 9 is respectively abutted to the opposite surfaces of the PTC heating film 101 and the conductive film 102, as shown in fig. 2, the movable pressing strip assembly 9 is positioned between the PTC heating film 101 and the conductive film 102 and close to the upper hot press roller 4 and the lower hot press roller 5, and when the thickness of the PTC heating film 101 changes, the movable pressing strip assembly 9 is abutted to the conductive film 102, so that the distance between the conductive film 102 and the upper hot press roller 4 is adjusted adaptively.
Specifically, as shown in fig. 2, 3, 4, 5, 6, 7 and 8, the movable bead assembly 9 includes an extension frame 10 connected to one side of the roller set frame 3 near the extruder 2, an upper shaft 91 and a lower shaft 92 are fixedly connected to the extension frame 10, the upper shaft 91 and the lower shaft 92 are parallel to the upper hot-press roller 4 and the lower hot-press roller 5, the upper shaft 91 is sequentially sleeved with an upper movable sleeve 93 along the axial direction thereof, the lower shaft 92 is sequentially sleeved with a lower movable sleeve 94 along the axial direction thereof, an outer cylinder wall of the upper movable sleeve 93 is fixedly connected with an upper bead 95, an outer cylinder wall of the lower movable sleeve 94 is fixedly connected with a lower bead 96, the upper bead 95 is divided into an upper strip portion 951 connected to one side of the outer cylinder wall of the upper movable sleeve 93, an upper short strip portion 952 connected to the other side of the outer cylinder wall of the upper movable sleeve 93, the lower bead 96 is divided into a lower strip portion 961 connected to one side of the outer cylinder wall of the lower movable sleeve 94, and a lower short strip portion 962 connected to the other side of the outer cylinder wall of the lower movable sleeve 94, wherein a pull rope 97 is connected between the upper short strip portion 952 and the lower short strip portion 962, the pull rope 97 is in a tensioning state, so that the upper strip portion 95 and the lower strip portion 96 are in a splayed shape with openings facing the hot pressing roller group, one end of the upper strip portion 951 is abutted to the conductive film 102, one end of the lower strip portion 961 is abutted to the PTC heating film 101, thereby the PTC heating film 101 of the hot pressing roller group is slightly thickened only by fixedly connecting the upper shaft rod 91 and the lower shaft rod 92 on the extension frame 10, the upper movable sleeve 93 and the lower movable sleeve 94 are respectively sleeved on the corresponding shaft rods and freely rotate around the axial direction of the shaft rods, no additional detection sensor or driving transmission component is needed, the upper short strip portion 952 and the lower short strip portion 962 are only in tensioning connection by the pull rope 97, for example 7, naturally pushing the lower strip portion 961 at the position to rotate upwards, the lower short strip portion 962 rotates downwards along with the lower strip portion 962, and pulls the pull rope 97 downwards, so that the upper strip portion 951 is driven to synchronously rotate upwards, because the length proportion of the upper strip portion 951 and the upper short strip portion 952 is set, the thickness change of the PTC heating film 101 extruded by the extruder 2 is possibly small in consideration of the normal preparation process, the smaller angle rotation of the upper short strip portion 952 can relatively drive the upper strip portion 951 to relatively larger-amplitude pushing the conductive film 102, the conductive film 102 is pushed to be close to the upper hot-pressing roller 4, so that the heating distance is reduced, therefore, when the PTC heating film 101 with larger thickness is hot-pressed, the correspondingly attached conductive film 102 is relatively more heated, thereby facilitating more sufficient hot-pressing adhesion, and more critical is considered that the extrusion principle of the extruder 2 is to extrude the obtained PTC composite paste into a film, the flowing direction of the PTC composite paste in the extruder 2 is shown in the direction of a dotted arrow in fig. 9, under the condition of uniform temperature in the extruder 2, the flowing distance of the PTC composite paste in the middle position is obviously smaller, the flowing distance of the PTC composite paste in the edge position is relatively larger, under the condition of uniform temperature, the PTC heating film 101 in the middle position is obviously thicker, the PTC heating film 101 in the edge position is expected to be thinner, the difficulty of accurately controlling the temperature of different positions in the extruder 2 is larger, and in this way, the PTC heating film 101 is sequentially sleeved on the shaft rod through each movable sleeve, namely freely rotated along the shaft rod, more preferably, each movable sleeve is slightly arranged at intervals, mutual interference is avoided, the distance of the conductive film 102 relative to the upper hot pressing roller 4 is adaptively adjusted through the functions of each pressing bar and the pull rope, thus, when the PTC heating film 101 is hot pressed, the thickness of the PTC heating film 101 in the same transverse width direction is not uniform, the problems of uneven hot-press adhesion and non-tight adhesion are caused, for example, the thickness of the middle position of the PTC heating film 101 in the same transverse width direction is thicker, and the conductive film 102 in the corresponding position is heated more fully, so that the middle position is heated and softened during hot-press adhesion, hot-press in the same transverse width direction is more uniform, hot-press gaps are avoided at the boundary, the hot-press temperature is adjusted adaptively at the film thickness position higher, the hot-press temperature is adjusted adaptively at the film thickness position lower, and stable and firm adhesion is facilitated.
In the embodiment of the present invention, as shown in fig. 2, 3, 4, 5, 6, 7 and 8, a main adjusting screw 11 is connected to the side of the extension frame 10 facing the extruder 2 in a threaded engagement manner, a push rod 12 is connected to one end of the main adjusting screw 11 penetrating into the inside of the extension frame 10, and is used for pushing each pull rope 97, that is, the distance that the main adjusting screw 11 stretches into the extension frame 10 is adjusted by turning the main adjusting screw 11, so that all pull ropes 97 are uniformly pushed, one end of the upper strip portion 951 can be adjusted to be abutted against the conductive film 102, one end of the lower strip portion 961 is abutted against the PTC heating film 101, the pull ropes 97 are kept in a tensioned state, and at the same time of keeping the tension, the distance that the pressing bars push the film surface can be further adjusted integrally, that is, the hot-pressing temperature of the conductive film 102 and the PTC heating film 101 can be adjusted integrally.
In the embodiment of the invention, as shown in fig. 2, 3, 4, 5, 6, 7 and 8, the lower short strip portion 962 is provided with a hollow structure, the lower short strip portion 962 is connected with the auxiliary adjusting screw 13 in a threaded engagement manner, the side end of the lower short strip portion 962 is provided with a through hole 14, and one end of the pull rope 97 penetrates into the lower short strip portion 962 through the through hole 14 and is connected with the auxiliary adjusting screw 13;
specifically, as shown in fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, the screw thread section 131 of the auxiliary adjusting screw 13 is located at the bottom end of penetrating into the lower short strip portion 962, and is connected with the lower short strip portion 962 through the screw thread section 131 in a meshed manner, the rotating ring 132 is preferably sleeved at the upper part of the screw thread section 131 of the auxiliary adjusting screw 13, the rotating ring 132 and the outer side wall of the auxiliary adjusting screw 13 keep the same flush with each other, one end of the pull rope 97 is connected to the rotating ring 132, the avoidance hole is formed at the side end of the extension frame 10, one end of the auxiliary adjusting screw 13 penetrates out of the extension frame 10 through the avoidance hole, the vertical rotation of the auxiliary adjusting screw 13 is not influenced, the auxiliary adjusting screw 13 is adjusted by the auxiliary adjusting screw 13, the distance of the auxiliary adjusting screw 13 extending into the lower short strip portion 962 is driven, namely, the adjusting pull rope 97 is driven to penetrate into different lengths in the lower short strip portion 962, so that the adhesive adjustment of different positions in the same transverse direction is realized, and the auxiliary adjusting ring 132 is rotated along with the rotating direction of the rotating ring 132, namely the rotating ring 97 is not influenced by the rotating direction of the lower short strip portion 97, and the inner short strip portion 952 is not influenced by the rotation of the corresponding adjusting screw rod 13, and the vertical movement is avoided along with the rotation of the rotating direction of the lower short strip portion opposite to the lower short strip portion 962, and the lower short strip portion is further adjusted.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the invention is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
Claims (10)
1. A method for preparing a PTC battery heating film, comprising the steps of:
adding granules of a multi-component polymer substrate and conductive filler into mixing equipment for smelting, wherein the multi-component polymer substrate comprises a multi-component resin matrix, controlling the smelting process temperature to be within a range between the melting point temperatures of the resin matrix of each component so as to enable the multi-component resin matrix to reach a semi-molten state, adding the conductive filler, smelting to obtain PTC composite slurry, and extruding and molding the PTC composite slurry through an extruder (2) to obtain a PTC heating film (101);
the extruded PTC heating film (101) is rolled by a hot press roller set, and a conductive film (102) is bonded on the upper layer of the PTC heating film (101) in a hot press mode to form a composite film;
the composite film is sheared to be of a fixed specification, the sheared composite film etches the upper conductive film (102) into a strip conductive belt through an etching process, and electrodes and connecting wires are packaged at the end parts of the conductive belt to prepare a PTC battery heating film semi-finished product;
and bonding and packaging the two sides of the PTC battery heating film semi-finished product with insulating films, exposing the lead wires, and obtaining the PTC battery heating film finished product.
2. A method of preparing a PTC battery heating film according to claim 1 wherein the multicomponent resin matrix comprises at least two of polyethylene, polypropylene, polyvinylidene fluoride, and fluorinated ethylene propylene, and the conductive filler comprises one or more of conductive carbon black, carbon nanotubes, graphite, graphene, and metal powder.
3. A method for producing a PTC battery heating film according to claim 1, wherein the hot pressing temperature of the hot pressing roller group is 17 ℃ to 23 ℃ below the melting point of the PTC heating film (101).
4. A method of producing a PTC battery heating film according to claim 1, wherein the insulating film comprises an inner PI film and an outer PI film.
5. A PTC battery heating film manufactured according to the method of manufacturing a PTC battery heating film according to any one of claims 1 to 4.
6. The utility model provides a hot pressing preparation facilities of PTC battery heating film, includes extruder (2) that are used for extruding PTC heating film (101), discharge end one side of extruder (2) is equipped with hot press roller group for hot pressing bonding PTC heating film (101) and conducting film (102), its characterized in that:
the hot-pressing roller set comprises a roller set frame (3), an upper hot-pressing roller (4) and a lower hot-pressing roller (5) are rotationally connected on the roller set frame (3), the upper hot-pressing roller (4) is symmetrically arranged up and down by the lower hot-pressing roller (5), a discharging roller (6) is rotationally connected on the roller set frame (3), a conducting film (102) is wound on the discharging roller (6), a first material guiding roller (7) is rotationally connected on one side, close to the upper hot-pressing roller (4), of the roller set frame (3), a second material guiding roller (8) is rotationally connected on one side, close to the lower hot-pressing roller (5), of the roller set frame (3), the conducting film (102) is rotationally fed to the bottom end of the upper hot-pressing roller (4) by the first material guiding roller (7), the PTC heating film (101) is rotationally fed to the top end of the lower hot-pressing roller (5) by the second material guiding roller (8), the upper hot-pressing roller (3), the conducting film (101) is rotationally arranged between the upper hot-pressing roller (101) and the hot-pressing roller set (5), the PTC heating film (101) is relatively arranged between the hot-pressing roller set (101), one end of the movable pressing strip assembly (9) is respectively abutted against the opposite surfaces of the PTC heating film (101) and the conductive film (102), and when the thickness of the PTC heating film (101) changes, the movable pressing strip assembly (9) is abutted against the conductive film (102) for adapting and adjusting the distance between the conductive film (102) and the upper hot pressing roller (4).
7. The hot-pressing preparation device for the PTC battery heating film according to claim 6, wherein the movable pressing bar assembly (9) comprises an extension frame (10) connected to one side of the roller group frame (3) close to the extruder (2), an upper shaft rod (91) and a lower shaft rod (92) are connected to the extension frame (10), the upper shaft rod (91), the lower shaft rod (92) and the upper hot-pressing roller (4) are arranged in parallel, an upper movable sleeve (93) is sequentially sleeved on the upper shaft rod (91) along the axial direction of the upper shaft rod, a lower movable sleeve (94) is sequentially sleeved on the lower shaft rod (92) along the axial direction of the lower shaft rod, an upper pressing bar (95) is fixedly connected to the outer cylinder wall of the upper movable sleeve (93), a lower pressing bar (96) is fixedly connected to the outer cylinder wall of the lower movable sleeve (94), the upper pressing bar (95) is divided into an upper strip portion (951) connected to one side of the outer cylinder wall of the upper movable sleeve (93), an upper strip portion (962) connected to the other side of the upper movable sleeve (93) is a short strip portion of the lower movable sleeve (952) connected to the lower strip portion (94) of the lower movable sleeve (94), the upper short strip portion (952) and the lower short strip portion (962) are connected with a pull rope (97), and the pull rope (97) is in a tensioning state so that an upper pressing strip (95) and a lower pressing strip (96) are in a splayed shape with openings facing the hot pressing roller group, one end of the upper long strip portion (951) is abutted to the conductive film (102), and one end of the lower long strip portion (961) is abutted to the PTC heating film (101).
8. The hot-pressing apparatus for preparing a PTC battery heating film according to claim 7, wherein a main adjusting screw (11) is connected to the side of the extension frame (10) facing the extruder (2) in a threaded engagement manner, and a push rod (12) is connected to one end of the main adjusting screw (11) penetrating into the inside of the extension frame (10) for pushing each pull rope (97).
9. The hot-pressing apparatus for preparing a PTC battery heating film according to claim 7, wherein the lower short strip portion (962) is provided with a hollow structure, the lower short strip portion (962) is connected with the auxiliary adjusting screw (13) in an engaged manner, the side end of the lower short strip portion (962) is provided with a through hole (14), and one end of the pull rope (97) penetrates into the lower short strip portion (962) through the through hole (14) and is connected with the auxiliary adjusting screw (13).
10. The hot-pressing apparatus for preparing a PTC battery heating film according to claim 9, wherein the threaded section (131) of the auxiliary adjusting screw (13) is located at the bottom end penetrating into the lower short strip portion (962) and is engaged with the lower short strip portion (962) through the threaded section (131), a swivel (132) is sleeved on the auxiliary adjusting screw (13) at the upper portion of the threaded section (131), and one end of the pull rope (97) is connected to the swivel (132).
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