CN113133141A - Insulation structure and insulation method for connecting point of heating plate pole piece and lead - Google Patents
Insulation structure and insulation method for connecting point of heating plate pole piece and lead Download PDFInfo
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- CN113133141A CN113133141A CN201911388762.2A CN201911388762A CN113133141A CN 113133141 A CN113133141 A CN 113133141A CN 201911388762 A CN201911388762 A CN 201911388762A CN 113133141 A CN113133141 A CN 113133141A
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- pole piece
- heating plate
- current
- carrying
- piece
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- 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
- H05B3/02—Details
- H05B3/06—Heater elements structurally combined with coupling elements or holders
- H05B3/08—Heater elements structurally combined with coupling elements or holders having electric connections specially adapted for high temperatures
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- Injection Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention discloses an insulation structure and an insulation method for a connection point of a heating sheet pole piece and a lead, wherein the insulation structure comprises the heating sheet pole piece and two leads, and also comprises two current-carrying sheets and a low-pressure injection molding packaging sheet, the end part of each lead is welded and fixed with the upper end face of the corresponding current-carrying sheet through a welding point, the current-carrying sheets are arranged on the upper surface of the heating sheet pole piece in a clinging manner, a plurality of heating sheet through holes are dispersedly formed in the heating sheet pole piece around the periphery of the current-carrying sheets, and the low-pressure injection molding packaging sheet is coated on the upper surface of the current-carrying sheet, the upper surface of the. The insulation structure has excellent insulation sealing performance, high waterproof and dustproof grade and good flame retardant effect; the drawing force between the lead and the heating plate pole piece is improved; the product performance under the process of the method is far superior to that of a product insulated by using a dispensing or potting process; the method can obviously improve the production efficiency and reduce the production cost.
Description
Technical Field
The invention relates to the technical field of electric heating, in particular to an insulation structure and an insulation method for a connecting point of a heating plate pole piece and a lead.
Background
The heating sheet is a two-dimensional planar heating material and is widely applied to the fields of civil heating, intelligent wearing, lithium battery pack heating, road deicing and other special applications. The planar heating sheet is classified into a carbon-based heating sheet, a metal oxide-based heating sheet, and a conductive polymer-based heating sheet according to the type of the heating body.
Generally, the planar heating plate is connected to a cylindrical or flat wire in practical use. The connection mode of the heating sheet and the lead wire comprises soldering, laser welding, ultrasonic welding, resistance welding and the like, the drawing force of the lead wire and the heating sheet after welding is an important test index, and the index determines the reliability of the product in practical application, such as the risk of electric leakage, ignition or explosion caused by falling off. At present, two solutions are provided for welding points, one is to attach an insulating tape to the welding points, the reliability of the method is poor, and the insulating tape can fall off after long-time use; and the other method is to use the insulating sealant to pour water at the welding spot, the method has low efficiency, general sealing effect and long sealant drying time, and is not suitable for mass production. And the two methods do not improve the drawing force of the welding spot obviously.
In view of the problems of the drawing force and insulation at the connection between the heating plate and the lead, it is necessary to develop an insulation structure and an insulation method with reliable insulation and sealing and high drawing force.
Disclosure of Invention
The present invention is directed to an insulation structure and an insulation method for a connection point between a heating plate pole piece and a lead wire, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an insulation system of heating plate pole piece and wire tie point, includes heating plate pole piece and two wires, still includes two current-carrying pieces and the low pressure encapsulation piece of moulding plastics, the wire tip passes through the welded point and corresponds the up end welded fastening of current-carrying piece, the current-carrying piece is hugged closely and is set up at heating plate pole piece upper surface, it is equipped with a plurality of heating plate through-holes to disperse all around the current-carrying piece on the heating plate pole piece, the encapsulation piece cladding of moulding plastics of low pressure is at current-carrying piece upper surface, heating plate pole piece upper surface and heating plate pole piece lower surface.
As a further scheme of the invention, at least one current-carrying sheet protrusion is arranged on the lower end face of the current-carrying sheet in an extending manner, a pole piece limiting groove which is in plug-in fit with the current-carrying sheet protrusion is formed in the upper surface of the heating sheet pole piece, and an adhesive layer is filled between the current-carrying sheet protrusion and the pole piece limiting groove.
As a further scheme of the invention, at least one pole piece protrusion is arranged on the upper surface of the heating piece pole piece in an extending manner, a current-carrying piece limiting groove which is in plug-in fit with the pole piece protrusion is formed in the lower end surface of the current-carrying piece, and an adhesive layer is filled between the current-carrying piece limiting groove and the pole piece protrusion.
As a further scheme of the invention, the heating plate pole piece adopts a carbon-based heating plate pole piece, a metal oxide-based heating plate pole piece or a conductive polymer-based heating plate pole piece.
As a further scheme of the invention, the lead wire adopts a cylindrical or flat lead wire.
As a further scheme of the invention, the low-pressure injection molding packaging sheet adopts polyamide hot melt adhesive, polyolefin hot melt adhesive or polyurethane hot melt adhesive.
As a further scheme of the invention, the number of the heating sheet through holes surrounding the current-carrying sheet is 2-4, the distance between the heating sheet through holes and the current-carrying sheet is more than 1mm, and the diameter of the heating sheet through holes is 0.3-2 mm.
A method for insulating a connecting point of a heating plate pole piece and a lead wire comprises the following steps:
s1, welding and fixing the end part of the lead on the upper end surface of the corresponding current-carrying sheet, and tightly attaching the current-carrying sheet on the upper surface of the heating sheet pole piece;
s2, dispersing and arranging a plurality of heating plate through holes on the heating plate pole piece around the current-carrying plate;
s3, placing the heating plate pole piece with the hole in an injection mold, and injecting a packaging material into the injection mold by using a low-pressure injection molding machine, wherein the packaging material wraps the outer surface of the heating plate pole piece to form a low-pressure injection molding packaging sheet;
and S4, after demolding, performing a drawing force test on the lead connected on the low-pressure injection molding packaging sheet, and performing a sealing property test, an insulating property test and a flame retardant test on the low-pressure injection molding packaging sheet, wherein the qualified product is the heating sheet pole piece insulating packaging product.
As a further scheme of the invention, the injection temperature in the step S3 is 110-.
Compared with the prior art, the invention has the beneficial effects that: a plurality of heating piece through holes are dispersedly formed in the heating piece pole piece around the current-carrying piece, and the heating piece through holes are used for penetrating the injection molding material which is sealed up and down through the through holes so as to achieve the purpose of connection; a certain distance is kept between the heating sheet through hole and the current-carrying sheet so as to ensure the insulation and voltage resistance performance; the low-pressure injection molding packaging sheet is formed by injection molding of polyamide hot melt adhesive, polyolefin hot melt adhesive or polyurethane hot melt adhesive, so that the insulation structure of the connecting points of the heating sheet pole piece, the current-carrying sheet and the lead has excellent insulation and sealing performance, high waterproof and dustproof grade and good flame retardant effect; the current-carrying piece and the heating piece pole piece are in a plug-in fit bonding structure of the convex part and the limiting groove, so that the current-carrying piece and the heating piece pole piece can keep good contact, and the drawing force between a lead and the heating piece pole piece is favorably improved; in the method, the injection molding temperature is 110-240 ℃, the viscosity of the packaging material is 1000-10000 mPa.s, the injection molding pressure is 5-40Kgf/cm2, and the bonding property between the packaging material and the metal material is good; the product performance under the process is far superior to that of a product insulated by using a dispensing or potting process; the method can obviously improve the production efficiency and reduce the production cost.
Drawings
FIG. 1 is a schematic structural view of an insulation structure of a connection point of a heating plate pole piece and a lead wire;
FIG. 2 is a schematic view of an embodiment of an insulation structure for a connection point of a heating plate pole piece and a lead wire, wherein a current-carrying plate is matched with the heating plate pole piece;
fig. 3 is a schematic view of a structure of a current-carrying chip cooperating with a heating chip pole piece in another embodiment of an insulation structure of a heating chip pole piece and a lead connection point.
In the figure: 1-low-pressure injection molding packaging piece, 2-heating piece through hole, 3-heating piece pole piece, 31-pole piece limiting groove, 32-pole piece bulge, 4-lead, 5-welding point, 6-current-carrying piece, 61-current-carrying piece bulge, 62-current-carrying piece limiting groove and 7-bonding layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides an insulation system of heating plate pole piece and wire tie point, includes heating plate pole piece 3 and two wires 4, still includes two current-carrying pieces 6 and the low pressure encapsulation piece 1 of moulding plastics, 4 tip of wire pass through welding point 5 and the up end welded fastening who corresponds current-carrying piece 6, current-carrying piece 6 is hugged closely and is set up at 3 upper surfaces of heating plate pole piece, disperse all around current-carrying piece 6 on the heating plate pole piece 3 and be equipped with a plurality of heating plate through-holes 2, the encapsulation of 1 cladding of low pressure moulding plastics is at 6 upper surfaces of current-carrying piece, 3 upper surfaces of heating plate pole piece and 3 lower surfaces of heating plate pole piece.
The heating plate through hole 2 is used for penetrating the injection molding material which is sealed up and down through the through hole, so that the purpose of connection is achieved. The low-pressure injection molding material is innovatively applied to the insulation packaging of the joint of the heating plate pole piece 3 and the lead 4, and has excellent insulation sealing performance and higher waterproof and dustproof grade.
Referring to fig. 2, the lower end surface of the current-carrying sheet 6 is extended to form at least one current-carrying sheet protrusion 61, the upper surface of the heating sheet pole piece 3 is provided with a pole piece limiting groove 31 which is in plug-in fit with the current-carrying sheet protrusion 61, and an adhesive layer 7 is filled between the current-carrying sheet protrusion 61 and the pole piece limiting groove 31.
As another embodiment, referring to fig. 3, at least one pole piece protrusion 32 is extended from the upper surface of the heating plate pole piece 3, a current-carrying plate limiting groove 62 inserted into and matched with the pole piece protrusion 32 is formed in the lower end surface of the current-carrying plate 6, and an adhesive layer 7 is filled between the current-carrying plate limiting groove 62 and the pole piece protrusion 32.
Adopt the cartridge cooperation adhesive structure of bulge and spacing groove between current-carrying piece 6 and the heating plate pole piece 3 for can keep good contact with heating plate pole piece 3 by current-carrying piece 6, be favorable to improving the drawing force between wire 4 and the heating plate pole piece 3.
The heating plate pole piece 3 is a carbon-based heating plate pole piece, a metal oxide-based heating plate pole piece or a conductive polymer-based heating plate pole piece. The lead 4 is a cylindrical or flat lead. The low-pressure injection molding packaging sheet 1 is made of polyamide hot melt adhesive, polyolefin hot melt adhesive or polyurethane hot melt adhesive. Particularly preferably, the polyamide is selected as the hot-melt material, has excellent flame retardant property and has the flame retardant grade of UL 94-V0.
Preferably, the number of the heating plate through holes 2 surrounded by the current-carrying plate 6 is 2-4, the distance between the heating plate through holes 2 and the current-carrying plate 6 is more than 1mm, and the diameter of the heating plate through holes 2 is 0.3-2 mm.
A method for insulating a connecting point of a heating plate pole piece and a lead wire comprises the following steps:
s1, welding and fixing the end part of the lead 4 on the upper end surface corresponding to the current-carrying sheet 6, and tightly attaching the current-carrying sheet 6 on the upper surface of the heating sheet pole piece 3;
s2, dispersing and arranging a plurality of heating plate through holes 2 on the heating plate pole piece 3 around the current-carrying plate 6;
s3, placing the heating plate pole piece 3 with the hole in an injection mold, and injecting a packaging material into the injection mold by using a low-pressure injection molding machine, wherein the packaging material wraps the outer surface of the heating plate pole piece 3 to form a low-pressure injection molding packaging piece;
and S4, after demolding, performing a drawing force test on the lead 4 connected on the low-pressure injection molding packaging sheet, and performing a sealing property test, an insulating property test and a flame retardant test on the low-pressure injection molding packaging sheet, wherein the qualified product is the heating sheet pole piece insulating packaging product.
Wherein the injection temperature in the step S3 is 110-240 ℃, the viscosity of the packaging material is 1000-10000 mPa.s, and the injection pressure is 5-40Kgf/cm 2. Under this condition, the adhesion between the sealing material and the metal material is good.
The insulating structure product provided by the embodiment of the invention has excellent performance, and the specific performance is as follows: the drawing force between the lead 4 and the heating sheet pole piece 3 is more than or equal to 20 kgf; the waterproof and dustproof grade between the lead 4 and the heating plate pole piece 3 is IP 67; the thickness of the formed low-pressure injection molding packaging sheet 1 is 3-5mm, and the thickness of one side of a welding spot is 2-3 mm; the other side is 1-2 mm; the pressure resistance of the formed low-pressure injection molding packaging sheet 1 is AC1500V, and the phenomena of flashover breakdown and the like are avoided; the production efficiency of the low-pressure injection molding process can reach 400 pieces/piece/hour. The low-pressure injection mold can be selectively designed according to parameters such as the size of a pole piece of the heating plate, the thickness of a welding spot, the thickness of the heating plate, the thickness of a lead, the insulation and voltage resistance grade and the like.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The utility model provides an insulation system of heating plate pole piece and wire tie point, includes heating plate pole piece (3) and two wire (4), its characterized in that: still include two current-carrying pieces (6) and low pressure encapsulation piece (1) of moulding plastics, wire (4) tip is through welding point (5) and the up end welded fastening who corresponds current-carrying piece (6), current-carrying piece (6) are hugged closely and are set up at heating plate pole piece (3) upper surface, it is equipped with a plurality of heating plate through-holes (2) to disperse around current-carrying piece (6) on heating plate pole piece (3), encapsulation piece (1) cladding is moulded plastics to low pressure at current-carrying piece (6) upper surface, heating plate pole piece (3) upper surface and heating plate pole piece (3) lower surface.
2. The insulation structure of a connection point of a pole piece of a heating plate and a lead wire according to claim 1, wherein: the lower terminal surface of current-carrying piece (6) extends and is provided with at least one current-carrying piece bulge (61), and pole piece spacing groove (31) with current-carrying piece bulge (61) cartridge complex is seted up to the upper surface of heating plate pole piece (3), and it is provided with adhesive linkage (7) to fill between current-carrying piece bulge (61) and pole piece spacing groove (31).
3. The insulation structure of a connection point of a pole piece of a heating plate and a lead wire according to claim 1, wherein: the upper surface of heating plate pole piece (3) extends and is provided with at least one pole piece bulge (32), and the lower terminal surface of current-carrying piece (6) is seted up with pole piece bulge (32) cartridge complex current-carrying piece spacing groove (62), and it is provided with adhesive linkage (7) to fill between current-carrying piece spacing groove (62) and pole piece bulge (32).
4. The insulation structure of a connection point of a pole piece of a heating plate and a lead wire according to claim 1, wherein: the heating plate pole piece (3) adopts a carbon-based heating plate pole piece, a metal oxide-based heating plate pole piece or a conductive polymer-based heating plate pole piece.
5. The insulation structure of a connection point of a pole piece of a heating plate and a lead wire according to claim 1, wherein: the lead (4) adopts a cylindrical or flat lead.
6. The insulation structure of a connection point of a pole piece of a heating plate and a lead wire according to claim 1, wherein: the low-pressure injection molding packaging sheet (1) adopts polyamide hot melt adhesive, polyolefin hot melt adhesive or polyurethane hot melt adhesive.
7. The insulation structure of a connection point of a pole piece of a heating plate and a lead wire according to claim 1, wherein: the number of the heating sheet through holes (2) surrounding the periphery of the current-carrying sheet (6) is 2-4, the distance between the heating sheet through holes (2) and the current-carrying sheet (6) is more than 1mm, and the diameter of the heating sheet through holes (2) is 0.3-2 mm.
8. An insulation method for a connecting point of a heating plate pole piece and a lead is characterized by comprising the following steps:
s1, welding and fixing the end part of the lead (4) on the upper end surface corresponding to the current-carrying sheet (6), and tightly attaching the current-carrying sheet (6) on the upper surface of the heating sheet pole piece (3);
s2, dispersing and arranging a plurality of heating piece through holes (2) on the heating piece pole piece (3) around the current-carrying piece (6);
s3, placing the heating plate pole piece (3) with the hole in an injection mold, and injecting a packaging material into the injection mold by using a low-pressure injection molding machine, wherein the packaging material wraps the outer surface of the heating plate pole piece (3) to form a low-pressure injection molding packaging plate;
and S4, after demolding, carrying out a drawing force test on the lead (4) connected on the low-pressure injection molding packaging sheet, and carrying out a sealing property test, an insulating property test and a flame retardant test on the low-pressure injection molding packaging sheet, wherein the qualified product is the heating sheet pole piece insulating packaging product.
9. The method of claim 8, wherein the step of insulating the connection points of the heater chip pads and the leads comprises: the injection temperature in the step S3 is 110-240 ℃, the viscosity of the packaging material is 1000-10000 mPa.s, and the injection pressure is 5-40Kgf/cm 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911388762.2A CN113133141A (en) | 2019-12-30 | 2019-12-30 | Insulation structure and insulation method for connecting point of heating plate pole piece and lead |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911388762.2A CN113133141A (en) | 2019-12-30 | 2019-12-30 | Insulation structure and insulation method for connecting point of heating plate pole piece and lead |
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| CN113133141A true CN113133141A (en) | 2021-07-16 |
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| CN201911388762.2A Pending CN113133141A (en) | 2019-12-30 | 2019-12-30 | Insulation structure and insulation method for connecting point of heating plate pole piece and lead |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114905695A (en) * | 2022-05-26 | 2022-08-16 | 河南问暖电子科技有限公司 | Sealing method for connecting part of vacuum packaging electrothermal film and terminal |
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2019
- 2019-12-30 CN CN201911388762.2A patent/CN113133141A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114905695A (en) * | 2022-05-26 | 2022-08-16 | 河南问暖电子科技有限公司 | Sealing method for connecting part of vacuum packaging electrothermal film and terminal |
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