CN116864244B - Preparation method of lining insulating film and vehicle-mounted battery module protective frame - Google Patents
Preparation method of lining insulating film and vehicle-mounted battery module protective frame Download PDFInfo
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- CN116864244B CN116864244B CN202311073239.7A CN202311073239A CN116864244B CN 116864244 B CN116864244 B CN 116864244B CN 202311073239 A CN202311073239 A CN 202311073239A CN 116864244 B CN116864244 B CN 116864244B
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- 230000001681 protective effect Effects 0.000 title claims abstract description 8
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- 238000000034 method Methods 0.000 claims abstract description 61
- 230000008569 process Effects 0.000 claims abstract description 55
- 230000009471 action Effects 0.000 claims abstract description 24
- 238000005520 cutting process Methods 0.000 claims description 63
- 238000009413 insulation Methods 0.000 claims description 54
- 239000004831 Hot glue Substances 0.000 claims description 40
- 229910052751 metal Inorganic materials 0.000 claims description 40
- 239000002184 metal Substances 0.000 claims description 40
- 239000010410 layer Substances 0.000 claims description 38
- 238000005096 rolling process Methods 0.000 claims description 29
- 230000003678 scratch resistant effect Effects 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 238000009957 hemming Methods 0.000 claims description 17
- -1 polyethylene terephthalate Polymers 0.000 claims description 9
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000009477 glass transition Effects 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 6
- 239000012790 adhesive layer Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/04—Treating the surfaces, e.g. applying coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
- H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
- H01M50/231—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks having a layered structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the technical field of new energy automobiles, in particular to a preparation method of an inner lining insulating film and a vehicle-mounted battery module protective frame. The preparation method of the lining insulating film has the technical key points that: the anti-scratch film, the first adhesive tape and the second adhesive tape are attached to the back surface of the insulating film side by side, a first cut-and-tear-easy area and a second cut-and-tear-easy area are formed in advance in the insulating film before edge folding operation is carried out, the first cut-and-tear-easy area and the second cut-and-tear-easy area are respectively covered by the first adhesive tape and the second adhesive tape partially or completely, free edges formed by the first cut-and-tear-easy area and the second cut-and-tear-easy area cannot warp due to the action of unbalanced bending force in the subsequent edge folding process, and the exceeding sections of the first adhesive tape and the second adhesive tape are required to be adhered to the insulating film after the first crease and the second crease are formed, the edge folding gesture can be temporarily maintained stable, and heat is accurately input to the first crease and the second crease in the subsequent process.
Description
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a preparation method of an inner lining insulating film and a vehicle-mounted battery module protective frame.
Background
With the development of science and technology, new energy automobiles are popularized on a large scale. The whole vehicle quality of the new energy automobile is closely related to the vehicle-mounted power supply unit. The vehicle-mounted power supply unit mainly comprises a vehicle-mounted battery module and a protective frame. The vehicle-mounted battery module is mainly used for supplying power to the motor and the control system, and the protection frame is used for providing peripheral protection for the vehicle-mounted battery module.
In the previous years, the protection frame is formed by integrally injection molding high-resistivity engineering plastics, so that the weather resistance is excellent, the service life can be maintained above 8 years, however, the raw material cost is higher, and the long-term fixing stability after the whole car is loaded is extremely poor. The four corners of the protection frame are provided with mounting bosses, and the protection frame is fixed with a chassis of the vehicle by means of longitudinally penetrating bolts. Because the vehicle is subjected to rough road surface and is subjected to intense shaking in high-speed running, the mounting boss is easy to deform or crack due to the action of periodic external force. In addition, due to the material characteristics, the protection frame is very easy to deform and even has a local bulge phenomenon due to the influence of heat emitted by the vehicle-mounted battery module.
In order to cope with the above problems, some head manufacturers develop a metal protection frame, that is, a metal outer frame (formed by welding a plurality of metal strips, metal plates or metal profiles) as a main structure, and for the purpose of realizing insulation design, the metal strips and the metal plates are coated with an insulating film. According to the design requirements of upstream manufacturers, a series of process avoidance notches are required to be formed along the two sides of the lining insulating film, and flanging operation is performed on the lining insulating film in advance so as to ensure that the metal strip or the metal plate is accurately coated. In this regard, two embodiments previously presented by the company research and development department, specifically, scheme one: cutting a process avoiding gap on the lining insulating film in advance by means of a die cutting machine, and then performing edge folding operation; scheme II: cutting out a cutting mark which is consistent with the appearance of the process avoidance notch on the lining insulating film in advance by means of a die cutting machine (the die cutting rule does not completely penetrate through the lining insulating film), then performing flanging operation, and finally tearing out the cutting mark areas in sequence by means of external force, wherein the process avoidance notch is formed. The following problems are encountered during embodiment one: because the crease needs to pass through the process avoiding notch, the free edge of the crease is extremely easy to warp due to the unbalanced force in the flanging process, so that the normal performance of the working performance of the conical flanging roller can be influenced, the quality of a finished product of the lining insulating film can be reduced (the free edge of the process avoiding notch is overlapped due to the fact that the free edge is subjected to the wrong rolling of the conical flanging roller), and the overall yield is low. Likewise, problems are encountered during the second embodiment, specifically: the cutting mark process is introduced, so that the problem of overlapping of free edges of the notch can be effectively solved, however, after the edge folding process is finished, a large amount of manpower is required to be consumed to tear off the cutting mark area, moreover, the cutting depth of the die cutter is difficult to accurately control, and the problem that the lining insulating film body is torn off in a joint way due to insufficient cutting depth occurs (when the cutting depth is insufficient, the connection strength between the cutting mark and the periphery of the lining insulating film body is not obviously weakened). More importantly, whether the first embodiment or the second embodiment is adopted, due to the influence of the material characteristics of the insulating film, the later stage of the folded edge formed on the insulating film (during the period from the packaging of the finished product to the unpacking of the site) is extremely easy to be influenced by restoring force, so that the bending angle cannot meet the design requirements of customers, and further the lining insulating film cannot be tightly and correctly coated on the metal strip or the metal plate. Accordingly, it is desirable for those skilled in the art to develop new embodiments to address the problems with existing manufacturing processes.
Disclosure of Invention
Therefore, in view of the above-mentioned problems and drawbacks, the present invention sets forth related data, through multiple evaluations and consideration, and through continuous experiments and modifications by the set personnel, the present invention finally results in the appearance of the method for preparing the liner insulating film.
In order to solve the technical problems, the invention relates to a preparation method of an inner lining insulating film, which comprises the following steps:
s1, an insulating film is formed by compounding an electric insulating base film and a hot melt adhesive layer; attaching a scratch-resistant film to the back surface of the electric insulation base film in a centering manner;
s2, respectively attaching a first adhesive tape and a second adhesive tape on the back surface of the electric insulation base film and on two sides of the scratch-resistant film; the outer side edge of the first adhesive tape exceeds the rear side edge of the electric insulation base film by a set distance m, and the outer side edge of the second adhesive tape exceeds the front side edge of the electric insulation base film by a set distance n;
s3, performing die cutting operation on the electric insulation base film to form a first cutting mark easy-to-tear unit and a second cutting mark easy-to-tear unit on the electric insulation base film;
the first cutting mark easy-to-tear unit is composed of a plurality of first cutting mark easy-to-tear areas which are linearly arrayed along the length direction of the electric insulation base film and take the rear side edge of the electric insulation base film as a die cutting starting reference;
the second cutting mark easy-to-tear unit is composed of a plurality of second cutting mark easy-to-tear areas which are linearly arrayed along the length direction of the electric insulation base film and take the front side edge of the electric insulation base film as a die cutting starting reference;
in the die cutting and forming process of the first cut easy-to-tear area, the die cutting knife sequentially penetrates through the electric insulation base film and the hot melt adhesive layer, and the first adhesive tape is not damaged;
in the die cutting and forming process of the second cutting mark easy-to-tear area, the die cutting knife sequentially penetrates through the electric insulation base film and the hot melt adhesive layer, and the second adhesive tape is not damaged;
s4, performing edge folding operation on the electric insulation base film, and additionally forming a first crease and a second crease adjacent to the rear side edge and the front side edge of the electric insulation base film, wherein additionally, the overrun sections of the first adhesive tape and the second adhesive tape are bonded with the hot melt adhesive layer due to compression;
each first incision easy-to-tear area is penetrated by the first incision;
each second cut easy-to-tear area is penetrated by the second fold;
s5, inputting heat to the first crease and the second crease, and enabling the temperature of the heat to reach T1; assuming that the glass transition temperature of the hot melt adhesive layer is T0, T0-20 ℃ is more than or equal to T1 and less than or equal to T0-5 ℃;
s6, executing equal-length cutting operation by using a cutting knife, wherein the insulating film, the scratch-resistant film, the first adhesive tape and the second adhesive tape are cut simultaneously;
s7, stripping the scratch-resistant film from the electric insulation base film;
s8, stripping the first adhesive tape from the electric insulation base film, and additionally taking off the first shear mark easily-torn area under the action of the adhesive force from the first adhesive tape to form a first process notch on the insulation film;
simultaneously, the second adhesive tape is peeled off from the electric insulation base film, the second cutting mark easy-to-tear area is additionally taken away under the action of the adhesive force from the second adhesive tape, and a second process notch is formed on the insulation film;
thus, the insulating film is formed.
As a further improvement of the technical scheme disclosed by the invention, one side of the scratch-resistant film, one side of the first adhesive tape and one side of the second adhesive tape are respectively provided with a normal-temperature self-adhesive layer; and assuming that the thickness of the scratch-resistant film is t1, the thickness of the first adhesive tape is t2, and the thickness of the second adhesive tape is t3, t1=t2=t3.
As a further improvement of the disclosed solution, m > 1mm and n > 1mm are provided in step S2.
As a further improvement of the technical proposal disclosed by the invention, the electric insulation base film is prepared from the raw materials of polyethylene terephthalate, polybutylene terephthalate, polyvinylidene fluoride or polytetrafluoroethylene, and has the resistivity higher than 10 10 Omega cm; the hot melt adhesive layer is formed by coating and curing liquid PA hot melt adhesive.
As a further improvement of the technical scheme disclosed by the invention, in step S4, a primary flanging unit, a secondary flanging unit, a tertiary flanging unit and a rolling unit are sequentially used for performing primary flanging operation, secondary flanging operation, tertiary flanging operation and flattening operation on the insulating film; the primary flanging unit consists of 2 primary conical rollers which are oppositely arranged along the width direction of the insulating film; the secondary flanging unit consists of 2 secondary conical rollers which are oppositely arranged along the width direction of the insulating film; the three-stage flanging unit consists of 2 three-stage conical rollers which are oppositely arranged along the width direction of the insulating film; the rolling unit is composed of 2 cylindrical flattening rollers which are oppositely arranged along the width direction of the insulating film; a wheel pressing unit is arranged at the downstream of the rolling unit; the wheel pressing unit is composed of a first rolling wheel and a second rolling wheel which are oppositely arranged along the width direction of the insulating film; in the process that the insulating film is pulled by tension, the overrun section of the first adhesive tape is adhered to the hot melt adhesive layer under the action of the follow-up rolling pressure from the first rolling wheel, and the overrun section of the second adhesive tape is adhered to the hot melt adhesive layer under the action of the follow-up rolling pressure from the second rolling wheel.
As a further improvement of the technical scheme disclosed by the invention, the taper values of the primary taper roller, the secondary taper roller and the tertiary taper roller are gradually decreased, and the taper value of the tertiary taper roller is not more than 1/15.
As a further improvement of the disclosed technical solution, in step S5, the first crease and the second crease are respectively subjected to linear thermal scanning by using two opposite lasers.
As a further improvement of the technical proposal disclosed by the invention, the working power of the laser is controlled to be 350-500 w, the scanning speed is controlled to be 5-8 mm/s, and the area of the formed round light spot is not more than 10mm 2 。
In addition, the invention also discloses a vehicle-mounted battery module protective frame which comprises a metal outer frame and the lining insulating film prepared by the lining insulating film preparation method. The metal outer frame is used for protecting a plurality of groups of battery modules which are arranged side by side, and is formed by welding a plurality of metal strips and metal plates. The inner liner insulating film is used as an electrical insulating layer between the battery module and the metal casing, and coats the metal strip or the metal plate.
As a further improvement of the technical scheme disclosed by the invention, the base material of the metal outer frame is aluminum alloy or magnesium aluminum alloy.
In the production and manufacturing stage, at least the following beneficial technical effects can be obtained by applying the preparation method of the lining insulating film, and the method specifically comprises the following steps:
1) Because each first cutting mark easy-to-tear area and each second cutting mark easy-to-tear area are respectively covered by the first adhesive tape and the second adhesive tape partially or completely, free edges formed by the first cutting mark easy-to-tear area and the second cutting mark easy-to-tear area are arranged in the process of forming the first crease and the second crease, the phenomenon of warping caused by unbalanced bending force can not occur, the phenomenon of overlapping rolling of the insulating film can be effectively avoided, the efficient and high-quality implementation of the flanging process is ensured, and the finished product of the lining insulating film has extremely high forming quality;
2) After the insulating film is cut in equal length sections, an operator can ensure that the first process notch and the second process notch can be formed conveniently and efficiently only by tearing off the first adhesive tape and the second adhesive tape, and more importantly, the first notch easy-to-tear area and the second notch easy-to-tear area completely penetrate through the insulating film, so that the problem that the first process notch and the second process notch area of the lining insulating film are damaged due to the action of improper tearing force is solved from the source;
3) After the first crease and the second crease are formed, the first adhesive tape and the second adhesive tape are stably adhered to the insulating film, namely, the bending postures of the first crease and the second crease are stably maintained, and a good bedding is provided for accurately inputting heat to the first crease and the second crease subsequently;
4) The first crease and the second crease are rapidly heated (limited by the glass transition temperature of the hot melt adhesive layer) due to the action of input heat, the hot melt adhesive layer in the area adjacent to the first crease and the second crease can be converted into a semi-molten state, the first crease and the second crease can be kept in a shaping bending state for a long time due to the fact that the first crease and the second crease are cooled, and the phenomenon that the bending angles of the first crease and the second crease are not up to standard due to the action of restoring force is effectively avoided;
5) According to the conventional practice in the industry, the dragging of the insulating film is mainly performed by means of the cooperation of the guide roller, the tension roller, the traction roller and the like, and the first adhesive tape, the scratch-resistant film and the second adhesive tape are adhered side by side, so that the phenomenon of back abrasion of the insulating film due to the fact that the insulating film is subjected to friction force for many times can be effectively avoided, the fact that the finished product of the lining insulating film has extremely high surface quality is ensured, and the resistivity value of the lining insulating film meets the customer acceptance standard.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of an insulating film involved in the method for producing an insulating film for lining of the present invention.
Fig. 2 is a partial enlarged view of I of fig. 1.
Fig. 3 is a schematic view showing a state in which the scratch-resistant film, the first tape, and the second tape are attached side by side on the back surface of the insulating film in the method for producing an insulating film for lining of the present invention.
Fig. 4 is an enlarged view of part II of fig. 3.
Fig. 5 is a schematic perspective view showing the process of forming the first and second tear-prone regions on the insulating film according to the present invention.
Fig. 6 is an enlarged view of part III of fig. 5.
Fig. 7 is a schematic perspective view (only a specific length section is shown) of the whole edge-folded insulating film involved in the method for producing an insulating film for lining of the present invention.
Fig. 8 is a schematic perspective view of a finished product of an insulating film for lining involved in the method for producing an insulating film for lining of the present invention.
Fig. 9 is a schematic diagram of a layout of a production line of a hemming process, a wheel pressing process, and a heat input process, which are involved in the method for producing an insulating film for a lining of the present invention.
Fig. 10 is a schematic view of the present invention after the lining insulating film is coated on the metal plate.
1-an insulating film; 11-an electrically insulating base film; 111-a first incision easy-tear unit; 1111—a first tear-prone region; 112-a second cut easy-tear unit; 1121-a second cut frangible region; 12-a hot melt adhesive layer; 121-a first bending reference line; 122-a second bending reference line; 13-a first process gap; 14-a second process gap; 2-scratch-resistant film; 3-a first tape; 4-a second tape; 5-a primary flanging unit; 51-a primary cone roll; a 6-secondary hemming unit; 61-a secondary conical roller; 7-a three-stage flanging unit; 73-three-stage conical rollers; an 8-roll press unit; 81-cylindrical flattening rollers; 9-a wheel pressing unit; 91-a first rolling wheel; 92-a second rolling wheel; 10-laser.
Detailed Description
The following describes the disclosure in further detail with reference to specific examples, and the method for preparing the liner insulating film includes the following steps:
s1, as shown in fig. 1 and 2, the insulating film 1 is formed by compounding an electrically insulating base film 11 and a hot melt adhesive layer 12. As shown in fig. 3 and 4, the scratch-resistant film 2 is attached to the back surface of the electrically insulating base film 11 in a centered manner;
s2, as shown in figures 3 and 4, attaching a first adhesive tape 3 and a second adhesive tape 4 on two sides of the scratch-resistant film respectively on the back surface of the electric insulation base film 11; and the outer side edge of the first adhesive tape 3 exceeds the rear side edge of the electric insulation base film by a set distance m, and the outer side edge of the second adhesive tape 4 exceeds the front side edge of the electric insulation base film by a set distance n; m is more than 1mm, n is more than 1mm;
a normal temperature self-adhesive layer (not shown in the figure) is arranged on one surface of the scratch-resistant film 2, one surface of the first adhesive tape 3 and one surface of the second adhesive tape 4; and assuming that the thickness of the scratch-resistant film 2 is t1, the thickness of the first adhesive tape 3 is t2, and the thickness of the second adhesive tape 4 is t3, t1=t2=t3, so that after the scratch-resistant film 2, the first adhesive tape 3 and the second adhesive tape 4 are attached in place relative to the electric insulation base film 11, the three are always kept on the same plane, and the insulation film 1 is smoothly dragged and fed under the cooperative action of a guide roller, a tension roller, a traction roller and the like;
s3, as shown in fig. 5 and 6, performing a die cutting operation on the electrically insulating base film 11 to form a first and a second tear-susceptible units 111 and 112 thereon;
the first cut easy-to-tear unit 111 is composed of a plurality of first cut easy-to-tear regions 1111 which are linearly arrayed along the length direction of the electrically insulating base film 11 and whose rear side edge of the electrically insulating base film 11 is used as a die-cutting start reference; the first shear mark easy-to-tear area is kept in an in-situ state under the action of the adhesive force of the first adhesive tape and is not separated from the insulating film 1 yet;
the second cut easy-to-tear unit 112 is composed of a plurality of second cut easy-to-tear regions 1121 which are linearly arrayed along the length direction of the electrically insulating base film 11 and use the front side edge of the electrically insulating base film 11 as a die-cutting start reference; the second shear mark easy-to-tear area is kept in an in-situ state under the action of the second adhesive tape adhesion force and is not separated from the insulating film 1 yet;
in the die-cutting forming process of the first incision easy-to-tear area 1111, the die-cutting knife sequentially penetrates through the electric insulation base film 11 and the hot melt adhesive layer 12, and does not hurt the first adhesive tape 3;
in the die-cutting molding process of the second cut easy-to-tear area 1121, the die-cutting knife penetrates through the electric insulation base film 11 and the hot melt adhesive layer 12 in sequence, and does not hurt the second adhesive tape 4;
s4, as shown in figures 7 and 9, performing a flanging operation on the electric insulation base film 11, and additionally forming a first crease and a second crease adjacent to the rear side edge and the front side edge of the electric insulation base film, wherein additionally, the overrun sections of the first adhesive tape 3 and the second adhesive tape 4 are adhered to the hot melt adhesive layer 12 due to being pressed;
each first tear-prone region 1111 is traversed by a first tear;
each second tear-prone region 1121 is traversed by a second fold;
fig. 6 shows a first bending reference line 121 and a second bending reference line 122, which are respectively assisted by forming a first crease and a second crease;
s5, inputting heat to the first crease and the second crease, and enabling the temperature of the heat to reach T1; assuming that the glass transition temperature of the hot melt adhesive layer 12 is T0, T0-20 ℃ is more than or equal to T1 and less than or equal to T0-5 ℃;
as shown in fig. 9, the first crease and the second crease are preferably subjected to linear thermal scanning by the two opposite lasers 10 respectively, so that the heat concentration is high, the heating speed of the first crease and the second crease region is ensured to meet the primary design requirement, and in addition, the heating power is accurately adjusted in real time;
according to the running experience conclusion of a production line for a period of time, the working power of the laser is preferably controlled to be 350-500 w, the scanning speed is controlled to be 5-8 mm/s, and the area of the formed circular light spot is not more than 10mm 2 ；
S6, performing equal-length cutting operation by using a cutting knife, wherein the insulating film 1, the scratch-resistant film 2, the first adhesive tape 3 and the second adhesive tape 4 are cut simultaneously;
s7, peeling the scratch-resistant film 2 from the electric insulation base film 11;
s8, as shown in fig. 8, the first adhesive tape 3 is peeled off from the electrically insulating base film 11, the first notch easily torn region 1111 is incidentally peeled off by the adhesive force from the first adhesive tape 3, and the first process notch 13 is molded on the insulating film 1;
at the same time, the second adhesive tape 4 is peeled off from the electrically insulating base film 11, the second notch easily torn region 1121 is incidentally peeled off by the adhesive force from the second adhesive tape 4, and the second process notch 14 is molded in the insulating film 1;
so far, the liner insulating film is prepared and molded (as shown in fig. 10).
In the process of implementing the method for producing the lining insulating film, attention is paid to the fact that the scratch-resistant film 2, the first adhesive tape 3 and the second adhesive tape 4 are sequentially attached to the back surface (non-hot melt adhesive layer surface) of the insulating film 1 along with the wire in the process of winding and unwinding in a workshop preparation stage, the process is focused on strictly controlling the extension length of the first adhesive tape 3 and the second adhesive tape 4 (facilitating the adhesion of the two to the insulating film 1 in the follow-up process), then the first cut-and-tear-prone region 1111 and the second cut-and-tear-prone region 1121 are cut and molded on the insulating film 1 by means of a die cutter in the process of uniformly feeding the insulating film 1 under the action of traction force, the process is focused on strictly controlling the die cutting depth to ensure that the insulating film 1 is completely penetrated (that is, the electric insulating base film 11 and the hot melt adhesive layer 12 are required to be penetrated together), and the first tape 3 and the second tape 4 are not damaged by the die cutting knife and are subject to the standard, then, the electric insulation base film 11 is folded to form the first crease and the second crease, the process is focused on ensuring that the extension exceeding section of the first tape 3 and the second tape 4 is adhered to the insulation film 1 (namely the hot melt adhesive layer 12) so as to prevent the follow-up heat from being focused on the first crease and the second crease accurately, then, the two opposite lasers are used for inputting heat to the first crease and the second crease respectively, the process is focused on that the limit temperature of the first crease and the second crease which are heated does not exceed the glass transition temperature of the hot melt adhesive layer 12, the first crease and the second crease are favorable for bending and shaping due to cold, the hot melt adhesive layer 12 is not modified due to the temperature overrun, finally, the scratch-proof film 2, the first adhesive tape 3 and the second adhesive tape 4 are sequentially torn off from the insulating film 1, and the process is focused on that the tearing speed needs to be strictly controlled so as to avoid the phenomenon that the local area of the insulating film 1 is scratched due to overlarge instantaneous stress.
In the production and manufacturing stage, at least the following beneficial technical effects can be obtained by applying the preparation method of the lining insulating film, and the method specifically comprises the following steps:
1) Because each first cutting mark easy-to-tear area 1111 and each second cutting mark easy-to-tear area 1121 are respectively covered by the first adhesive tape 3 and the second adhesive tape 4 partially or completely, during the process of forming the first crease and the second crease, the free edges formed by the first cutting mark easy-to-tear area 1111 and the second cutting mark easy-to-tear area 1121 are opened, the warping phenomenon can not occur due to the unbalanced bending force, the occurrence of the phenomenon of overlapping rolling of the insulating film can be effectively avoided, the efficient and high-quality implementation of the flanging process can be ensured, and the finished product of the lining insulating film has extremely high forming quality;
2) When the insulating film 1 is cut in equal length sections, an operator can ensure that the first process notch 13 and the second process notch 14 are formed conveniently and efficiently only by tearing off the first adhesive tape 3 and the second adhesive tape 4, more importantly, the first cut easily-torn area 1111 and the second cut easily-torn area 1121 completely penetrate the insulating film 1, and in the process of tearing the first adhesive tape 3 and the second adhesive tape 4, the first cut easily-torn area 1111 and the second cut easily-torn area 1121 can be smoothly separated from the insulating film 1 body, so that the problem that the preformed areas of the first process notch 13 and the second process notch 14 on the liner insulating film 11 are damaged due to the action of improper tearing force is solved from the source;
3) After the first crease and the second crease are formed, the first adhesive tape 3 and the second adhesive tape 4 are stably adhered to the insulating film 1, namely, the bending postures of the first crease and the second crease are stably maintained, and a good bedding is provided for accurately inputting heat to the first crease and the second crease subsequently;
4) The first crease and the second crease are rapidly heated (limited by the glass transition temperature of the hot melt adhesive layer) due to the action of input heat, the hot melt adhesive layer 12 in the area adjacent to the first crease and the second crease can be converted into a semi-molten state, the first crease and the second crease can be kept in a shaping bending state for a long time due to the fact that the first crease and the second crease are cooled, and the phenomenon that the bending angles of the first crease and the second crease are not up to standard due to the action of restoring force is effectively avoided;
according to the conventional practice in the industry, the dragging of the insulating film 1 is mainly performed by means of the cooperation of the guide roller, the tension roller, the traction roller and the like, and the first adhesive tape 3, the scratch-resistant film 2 and the second adhesive tape 4 are adhered side by side, so that the phenomenon that the back surface of the insulating film 1 is worn due to the fact that the insulating film is subjected to friction force for many times can be effectively avoided, the fact that the finished product of the lining insulating film has extremely high surface quality is ensured, and the resistivity value of the lining insulating film meets the customer acceptance standard.
Furthermore, the electrical insulating base film 11 is preferably made of polyethylene terephthalate, polybutylene terephthalate, polyvinylidene fluoride or polytetrafluoroethylene, and has a specific resistance higher than 10, in view of both the purchase cost and good electrical characteristics (high insulation is an index of weight of interest) of the finished product 10 Ω·cm。
As is known, according to the general knowledge, various embodiments may be adopted to complete the flanging operation of the insulating film 1, for example, a wire-following flanging machine is more commonly used (the flanging operation is completed in a section-by-section manner during the process of dragging and conveying the insulating film 1), however, the purchasing cost and the matching modification cost of the manufacturer in the early stage of development are too high to bear, and in this regard, the invention newly discloses an embodiment which has simple structural design and lower implementation cost, and the flanging efficiency and the flanging quality meet the basic requirements of customers, specifically: as shown in fig. 9, the primary hemming unit 5, the secondary hemming unit 6, the tertiary hemming unit 7, the rolling unit 8 perform a primary hemming operation, a secondary hemming operation, a tertiary hemming operation, a flattening operation on the insulating film 1 in this order; the primary hemming unit 5 is constituted by 2 primary tapered rollers 51 disposed opposite to each other in the width direction of the insulating film 1; the secondary hemming unit 6 is constituted by 2 secondary tapered rollers 61 disposed opposite to each other in the width direction of the insulating film 1; the three-stage hemming unit 7 is constituted by 2 three-stage taper rollers 71 disposed opposite to each other in the width direction of the insulating film 1; the roll pressing unit 8 is constituted by 2 two cylindrical flattening rolls 81 disposed opposite each other in the width direction of the insulating film 1; the taper values of the primary taper roller 51, the secondary taper roller 61 and the tertiary taper roller 71 decrease in sequence, and the taper value of the tertiary taper roller 71 is not more than 1/15. In addition, a wheel pressing unit 9 is further provided downstream of the rolling unit 8; the roller unit 9 is constituted by a first roller 91 and a second roller 92 which are disposed opposite to each other in the width direction of the insulating film 1; in the process that the insulating film 1 is pulled by tension, the overrun section of the first adhesive tape 3 is bonded with the hot melt adhesive layer 12 under the action of the following rolling pressure from the first rolling wheel 91, and the overrun section of the second adhesive tape 4 is bonded with the hot melt adhesive layer 12 under the action of the following rolling pressure from the second rolling wheel 92 (under the action of forward pressure, the stable bonding with the insulating film 1 can be realized by using the normal-temperature self-adhesive layers of the first adhesive tape 3 and the second adhesive tape 4).
In actual preparation, before formally performing the flanging operation, a worker needs to manually turn over both sides of the insulating film 1 and pass through the primary conical roller 51, the secondary conical roller 61, the tertiary conical roller 71 and the cylindrical flattening roller 81 in sequence under the action of hand dragging force, and it is important to remind that, in the initial stage of translational dragging of the insulating film 1 due to the action of the dragging force, the worker needs to check the running states of the primary conical roller 51, the secondary conical roller 61, the tertiary conical roller 71 and the cylindrical flattening roller 81 and the flanging forming form of the insulating film 1 on line for many times so as to avoid preparing and forming defective products with large lengths.
As another key development result, the invention also discloses a vehicle-mounted battery module protective frame, which comprises a metal outer frame and an inner lining insulating film. The liner insulating film is prepared by the liner insulating film preparation method disclosed hereinabove. The metal outer frame is used for protecting a plurality of groups of battery modules which are arranged side by side, and is formed by welding a plurality of metal strips and metal plates. On the premise of ensuring that the metal outer frame has enough structural strength, the base material is preferably selected from aluminum alloy or magnesium-aluminum alloy with high strength, low mass density and excellent corrosion resistance and weldability in view of reducing the dead weight of the finished product. The inner liner insulating film is used as an electrical insulating layer between the battery module and the metal casing, and coats the metal strip or the metal plate. After the lining insulating film is positioned relative to the metal strip or the metal plate, the lining insulating film is heated by heating equipment, the hot melt adhesive layer is melted and liquefied, and then stable adhesion with the metal strip or the metal plate is realized due to cooling.
Finally, in order to improve the application convenience of the finished product of the liner insulating film, the hot melt adhesive layer 12 compounded on the electric insulating base film is preferably formed by coating and curing a liquid PA hot melt adhesive. Compared with other types of hot melt adhesives, the PA hot melt adhesive has good adhesive property, and the glass transition temperature is relatively high, so that the phenomenon that the lining insulating film is separated from the protection frame of the vehicle-mounted battery module due to rapid temperature rise caused by a large amount of heat input from the vehicle-mounted battery module can be effectively avoided, and the protection frame and the vehicle-mounted battery module can be kept in an electric insulation state for a long time.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The preparation method of the lining insulating film is characterized by comprising the following steps of:
s1, an insulating film is formed by compounding an electric insulating base film and a hot melt adhesive layer; attaching a scratch-resistant film to the back surface of the electric insulation base film in a centering manner;
s2, respectively attaching a first adhesive tape and a second adhesive tape on the back surface of the electric insulation base film and on two sides of the scratch-resistant film; and the outer side edge of the first adhesive tape exceeds the rear side edge of the electric insulation base film by a set distance m, and the outer side edge of the second adhesive tape exceeds the front side edge of the electric insulation base film by a set distance n;
s3, performing die cutting operation on the electric insulation base film to form a first cutting mark easy-to-tear unit and a second cutting mark easy-to-tear unit on the electric insulation base film;
the first cutting mark easy-to-tear unit is composed of a plurality of first cutting mark easy-to-tear areas which are linearly arrayed along the length direction of the electric insulation base film and take the rear side edge of the electric insulation base film as a die cutting starting reference;
the second cutting mark easy-to-tear unit is composed of a plurality of second cutting mark easy-to-tear areas which are linearly arrayed along the length direction of the electric insulation base film and take the front side edge of the electric insulation base film as a die cutting starting reference;
in the die-cutting forming process of the first cutting mark easy-to-tear area, a die-cutting knife sequentially penetrates through the electric insulation base film and the hot melt adhesive layer, and the first adhesive tape is not damaged;
in the die-cutting forming process of the second cut easy-to-tear area, a die-cutting knife sequentially penetrates through the electric insulation base film and the hot melt adhesive layer, and the second adhesive tape is not damaged;
s4, performing edge folding operation on the electric insulation base film, and additionally forming a first crease and a second crease adjacent to the rear side edge and the front side edge of the electric insulation base film, wherein additionally, the overrun sections of the first adhesive tape and the second adhesive tape are adhered to the hot melt adhesive layer due to compression;
each first notch easy-to-tear area is penetrated by the first notch;
each second cut easy-to-tear region is penetrated by the second fold;
s5, inputting heat to the first crease and the second crease, and enabling the temperature of the heat to reach T1; assuming that the glass transition temperature of the hot melt adhesive layer is T0, T0-20 ℃ is more than or equal to T1 and less than or equal to T0-5 ℃;
s6, executing equal-length parting operation by using a parting knife, wherein the insulating film, the scratch-resistant film, the first adhesive tape and the second adhesive tape are simultaneously cut;
s7, peeling the scratch-resistant film from the electric insulation base film;
s8, stripping the first adhesive tape from the electric insulation base film, wherein the first shear mark easily-torn area is additionally taken away under the action of the adhesive force from the first adhesive tape, and a first process notch is formed in the insulation film;
simultaneously, the second adhesive tape is peeled off from the electric insulation base film, the second shear mark easy-to-tear area is additionally taken away under the action of the adhesive force from the second adhesive tape, and a second process notch is formed on the insulation film;
thus, the insulating film is formed.
2. The method for producing a lining insulating film according to claim 1, wherein a normal-temperature self-adhesive layer is provided on one surface of each of the scratch-resistant film, the first tape and the second tape; and assuming that the thickness of the scratch-resistant film is t1, the thickness of the first adhesive tape is t2, and the thickness of the second adhesive tape is t3, t1=t2=t3.
3. The method for producing an insulating film for a lining according to claim 1, wherein m > 1mm and n > 1mm are used in step S2.
4. The method for producing an insulating film for an inner liner according to claim 1, wherein the electric insulating base film is produced from polyethylene terephthalate, polybutylene terephthalate, polyvinylidene fluoride or polytetrafluoroethylene, and has a specific resistance of higher than 10 10 Omega cm; the hot melt adhesive layer is formed by coating and curing liquid PA hot melt adhesive.
5. The method for producing an insulating film for a lining according to claim 4, wherein in step S4, a primary hemming unit, a secondary hemming unit, a tertiary hemming unit, a rolling unit are sequentially used to perform a primary hemming operation, a secondary hemming operation, a tertiary hemming operation, a flattening operation on the insulating film; the primary flanging unit is composed of 2 primary conical rollers which are oppositely arranged along the width direction of the insulating film; the secondary flanging unit is composed of 2 secondary conical rollers which are oppositely arranged along the width direction of the insulating film; the three-stage flanging unit is composed of 2 three-stage conical rollers which are oppositely arranged along the width direction of the insulating film; the rolling unit is composed of 2 cylindrical flattening rollers which are oppositely arranged along the width direction of the insulating film; a wheel pressing unit is arranged at the downstream of the rolling unit; the wheel pressing unit is composed of a first rolling wheel and a second rolling wheel which are oppositely arranged along the width direction of the insulating film; in the process that the insulating film is pulled by tension, the overrun section of the first adhesive tape is adhered to the hot melt adhesive layer under the action of the follow-up rolling pressure from the first rolling wheel, and the overrun section of the second adhesive tape is adhered to the hot melt adhesive layer under the action of the follow-up rolling pressure from the second rolling wheel.
6. The method for producing an insulating film for a lining according to claim 5, wherein the taper values of the primary taper roller, the secondary taper roller, and the tertiary taper roller decrease in order, and the taper value of the tertiary taper roller is not more than 1/15.
7. The method according to claim 1, wherein in step S5, the first fold and the second fold are each subjected to linear thermal scanning by two opposing lasers.
8. The method for preparing a lining insulating film according to claim 7, wherein the laser is controlled to have a working power of 350-500 w, a scanning speed of 5-8 mm/s, and a circular spot area of not more than 10mm 2 。
9. A vehicle-mounted battery module protective frame, characterized by comprising a metal outer frame and an inner insulating film prepared by the inner insulating film preparation method according to any one of claims 1 to 8; the metal outer frame is used for protecting a plurality of groups of battery modules which are arranged side by side and is formed by welding a plurality of metal strips and metal plates; the inner liner insulating film is used as an electrical insulating layer between the battery module and the metal casing, and coats the metal strip or the metal plate.
10. The vehicle-mounted battery module protection frame according to claim 9, wherein the metal outer frame is made of aluminum alloy or magnesium aluminum alloy.
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| CN202311073239.7A CN116864244B (en) | 2023-08-24 | 2023-08-24 | Preparation method of lining insulating film and vehicle-mounted battery module protective frame |
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| JP2019046580A (en) * | 2017-08-30 | 2019-03-22 | 株式会社豊田自動織機 | Manufacturing method of film-attached electrode assembly |
| CN214013104U (en) * | 2020-12-28 | 2021-08-20 | 蜂巢能源科技有限公司 | Battery insulation film |
| CN113927985A (en) * | 2021-11-22 | 2022-01-14 | 温州市和平拉链布胶有限公司 | Zipper adhesive tape and manufacturing method thereof |
| CN218602706U (en) * | 2022-04-14 | 2023-03-10 | 欣旺达电动汽车电池有限公司 | Insulating film and battery module |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019046580A (en) * | 2017-08-30 | 2019-03-22 | 株式会社豊田自動織機 | Manufacturing method of film-attached electrode assembly |
| CN214013104U (en) * | 2020-12-28 | 2021-08-20 | 蜂巢能源科技有限公司 | Battery insulation film |
| CN113927985A (en) * | 2021-11-22 | 2022-01-14 | 温州市和平拉链布胶有限公司 | Zipper adhesive tape and manufacturing method thereof |
| CN218602706U (en) * | 2022-04-14 | 2023-03-10 | 欣旺达电动汽车电池有限公司 | Insulating film and battery module |
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