Conductive film

Abstract

The utility model discloses a conductive film, which comprises a base material layer, a heating conductive layer and a heating carbon paste layer which are laminated. The base material layer comprises a first surface and a second surface which are oppositely arranged. The heating conducting layer is arranged on the first surface of the base material layer, the heating conducting layer comprises an insulating bearing layer with a groove and a conducting electrode which is filled in the groove and is made of a conducting material, one side, far away from the base material layer, of the heating conducting layer is a bearing surface, and the conducting electrode is exposed and distributed on the bearing surface. The heating carbon paste layer covers the bearing surface and is in contact with the conductive electrode. The conductive electrodes are arranged in the grooves, and insulating materials which are basically equal in height exist between the conductive electrodes, so that the heating carbon paste layer is printed on an approximate plane, the uniformity of the heating carbon paste layer is ensured, the offset at the edge is avoided, and the heating uniformity effect is obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical technology field especially relates to a conductive film. BACKGROUND

[0002] New energy battery technology is a technology field that has attracted much attention in recent years, mainly including lithium-ion batteries, fuel cells, solar cells, etc. These battery technologies have a wide range of applications in mobile power supplies, electric vehicles, energy storage systems, etc. With the continuous progress of technology, the energy density, charge and discharge efficiency, and safety of new energy batteries have been significantly improved. However, the performance of the battery is greatly affected during use, especially in low temperature environments, therefore, how to improve the performance of new energy batteries in low temperature environments is an important research direction. The preparation technology of heating type conductive film is an effective means to improve the low temperature performance of new energy batteries. The heating type conductive film can provide uniform heating effect, thereby maintaining the normal working temperature of the battery and prolonging the service life of the battery. The traditional preparation method of heating type conductive film is mainly to form copper wire electrodes by etching the copper layer, and then to print a layer of heating carbon paste on the copper wire electrodes as a heating layer. However, due to the gap between the etched copper wire electrodes, the uniformity of the printing of the upper layer of carbon paste is affected, resulting in uneven heating effect at the edge corners of the copper wire electrodes, thereby affecting the overall heating effect of the heating type conductive film. In addition, the existing preparation method also needs to go through complex processes such as etching, which not only increases the preparation time, but also increases the risk of environmental pollution during the preparation process. SUMMARY

[0003] Therefore, it is necessary to provide a heating type conductive film to solve the above technical problems.

[0004] One technical scheme of the utility model is: a conductive film, comprising:

[0005] a substrate layer comprising a first surface and a second surface arranged oppositely;

[0006] a heating conductive layer arranged on the first surface of the substrate layer, the heating conductive layer comprising an insulating carrier layer with grooves and conductive electrodes formed by filling conductive material in the grooves, the side of the heating conductive layer away from the substrate layer being a carrier surface, and the conductive electrodes being exposed and distributed on the carrier surface;

[0007] a heating carbon paste layer arranged on the carrier surface and in contact with the conductive electrodes.

[0008] In one embodiment, the substrate layer is one or a composite layer of a PI layer, a PET layer, a PC layer, or a PMMA layer; the thickness of the substrate layer ranges from 50 μm to 500 μm.

[0009] In one embodiment, the insulating carrier layer is a photocuring glue layer or a thermal curing glue layer.

[0010] In one embodiment, the groove has a depth ranging from 10 μm to 100 μm, a width ranging from 10 μm to 100 μm, a bottom wall and side walls on both sides of the bottom wall, and a distance from the bottom wall to the first surface ranging from 2 μm to 20 μm.

[0011] In one embodiment, the groove is filled with conductive material such as silver paste, copper powder, ITO or PEDOT to form a conductive electrode, and the filling rate of the conductive material in the groove ranges from 90% to 110%.

[0012] In one embodiment, the heating carbon paste layer has a thickness ranging from 10 μm to 200 μm.

[0013] In one embodiment, the conductive electrodes are distributed in a grid shape, and the grid shape is one of a circle, a rectangle, a square, a diamond, a hexagon, and a random polygon.

[0014] In one embodiment, the heating conductive layer has two layers arranged on the first surface and the second surface respectively, and the heating carbon paste layer has two layers, each of which is arranged on one of the two layers of the heating conductive layer.

[0015] In one embodiment, the encapsulation layer arranged on the heating carbon paste layer is a polymer layer or a cured glue layer.

[0016] In one embodiment, the conductive film is a new energy battery pack PTC heating film.

[0017] The conductive electrodes are arranged in the grooves, and there is insulating material of substantially the same height between the conductive electrodes, so that the printing of the heating carbon paste layer can be performed on an approximately flat surface, the uniformity of the heating carbon paste layer is ensured, and the difference in height at the edges is avoided, thereby significantly improving the heating uniformity, and the forming scheme of filling the grooves with conductive material is adopted, so that a large amount of copper is not needed, thereby reducing the preparation cost and being conducive to lightweight design. In addition, the grooves are formed by embossing to replace complex processes such as etching, which not only saves the preparation time but also reduces the environmental pollution risk in the preparation process, improves the preparation efficiency and performance of the conductive film, and the conductive film has good heat conduction performance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic view of a cross-sectional structure of a conductive film according to the present application;

[0019] Figure 2 FIG. 2 is a schematic view of another cross-sectional structure of a conductive film according to the present application.

[0020] Figure 3 It is another cross section structure schematic view of the conductive film of the utility model;

[0021] Figure 4 It is another cross section structure schematic view of the conductive film of the utility model;

[0022] Figure 5 It is another cross section structure schematic view of the conductive film of the utility model;

[0023] Figure 6 It is another cross section structure schematic view of the conductive film of the utility model. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the attached drawings. Preferred embodiments of the utility model are provided in the drawings. However, the utility model can be realized in many different forms and is not limited to the embodiments described below. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] The utility model discloses a kind of conductive films, in particular a kind of heating type conductive film, it can be used in new energy battery, traffic, building etc.

[0028] The conductive film comprises a substrate layer, a heating conductive layer and a heating carbon paste layer arranged in layers. The substrate layer comprises a first surface and a second surface arranged oppositely. The heating conductive layer is arranged on the first surface of the substrate layer, and comprises an insulating carrier layer with grooves and conductive electrodes formed by filling the conductive material in the grooves. The side of the heating conductive layer away from the substrate layer is a carrier surface, and the conductive electrodes are exposed and distributed on the carrier surface. The heating carbon paste layer is arranged on the carrier surface and in contact with the conductive electrodes. The conductive electrodes are arranged in the grooves, and there is insulating material of substantially the same height between the conductive electrodes, so that the printing of the heating carbon paste layer can be carried out on an approximately flat surface, ensuring the uniformity of the heating carbon paste layer and avoiding the difference at the edge, thereby significantly improving the heating uniformity effect. In addition, the grooves are formed by embossing, instead of complex processes such as etching, which not only saves the preparation time, but also reduces the environmental pollution risk in the preparation process, improves the preparation efficiency and performance of the conductive film, and the conductive film has good heat conduction performance.

[0029] In one embodiment, the conductive film is applied in the field of new energy battery technology, and the conductive film is a new energy battery pack PTC heating film. The conductive film can effectively improve the heating uniformity effect of the new energy battery pack PTC heating film, thereby improving the performance of the new energy battery in a low temperature environment, prolonging the service life of the battery, reducing the preparation cost, facilitating lightweight design, improving durability and reliability, reducing preparation time and environmental pollution risk, and having important significance for the popularization and application of new energy battery technology, thereby improving market demand.

[0030] In one embodiment, the substrate layer is one or a composite layer of a PI layer, a PET layer, a PC layer or a PMMA layer. The thickness of the substrate layer ranges from 50 to 500 microns. PI, PET, PC and PMMA have excellent mechanical properties, thermal stability, electrical insulation and chemical stability, which increase the durability and reliability of the conductive film.

[0031] In one embodiment, the insulating carrier layer is a photocuring adhesive layer or a thermocuring adhesive layer. The grooves are formed by coating the photocuring adhesive layer or the thermocuring adhesive layer on the substrate layer, using a mold to emboss and solidify, and then demolding. The insulating property is good, the forming process is simple, and there is no environmental pollution.

[0032] In one embodiment, the depth of the groove ranges from 10 μm to 100 μm, the width of the groove ranges from 10 μm to 100 μm, the groove comprises a bottom wall and side walls on both sides of the bottom wall, and the distance from the bottom wall to the first surface ranges from 2 μm to 20 μm. The groove is set according to the width, depth, resistance, etc. of the required conductive electrode, and the process limit is small. The conductive electrode is formed by filling the groove with conductive materials such as silver paste, copper powder, ITO, or PEDOT; and the filling rate of the conductive material in the groove ranges from 90% to 110%. One or two kinds of conductive materials can be filled, and the groove can be filled incompletely, exactly, or beyond the depth, so that the surface of the filled heating conductive layer becomes a bearing surface, which is generally considered to be a flat surface, avoiding the difference, to ensure the uniformity of the heating carbon paste layer, improve the uniformity and stability of heating, and improve the service life.

[0033] In one embodiment, the thickness of the heating carbon paste layer is 10 μm to 200 μm. The thickness of the heating carbon paste layer is set according to the heating needs, and because the heating conductive layer is arranged in the groove, the depth-width ratio is less limited by the process, the power, resistance, and current setting range of the heating conductive layer is expanded, and the thickness of the heating carbon paste layer is also not limited.

[0034] In one embodiment, the conductive electrode is distributed in a grid shape, and the grid is one of a circle, a rectangle, a square, a diamond, a hexagon, and a random polygon. The grid-shaped conductive electrode can make the heating more uniform. The heating carbon paste layer is distributed in a line or a grid shape, and the line or grid line of the heating carbon paste layer is arranged perpendicularly to the conductive electrode.

[0035] In one embodiment, the heating conductive layer has two layers arranged on the first surface and the second surface, respectively; and the heating carbon paste layer has two layers, each layer of the heating carbon paste layer being arranged on one layer of the heating conductive layer. The heating conductive layer can be arranged on the first surface and / or the second surface of the substrate layer. The first surface and the second surface can each be provided with a heating conductive layer, and the two layers of the heating conductive layer can be operated simultaneously or separately, thereby improving the heating efficiency and the service life.

[0036] In one embodiment, the conductive film further comprises an encapsulation layer arranged on the heating carbon paste layer, and the encapsulation layer is a polymer layer or a cured adhesive layer. For example, the encapsulation layer is a UV adhesive directly coated on the heating carbon paste layer, which has good sealing and insulation effects. For example, the encapsulation layer is a PI film with a back adhesive, which has good sealing, insulation, and stability effects.

[0037] The conductive film of the present application is described below by way of example. Figures 1 to 4

[0038] The conductive film of the present application is described below by way of example. Figure 1 ​The utility model discloses a conductive film 100, it includes substrate layer 1, heating conductive layer 2 and heating carbon slurry layer 3. Substrate layer 1 includes oppositely arranged first surface 11 and second surface 12. Heating conductive layer 2 is arranged at first surface 11. Heating conductive layer 2 includes the insulating bearing layer 21 with groove 211 and the conductive electrode 22 formed by the conductive material filled in groove 211, and the side of heating conductive layer 2 away from substrate layer 1 is bearing face 23, and the conductive electrode 22 is exposed and distributed at bearing face 23. Heating carbon slurry layer 3 is covered at bearing face 23, and heating carbon slurry layer 3 is arranged in contact with the conductive electrode 22. The conductive electrode 22 is embedded in groove 211, and there is substantially equal height insulating material between the conductive electrode 22, so that the printing of heating carbon slurry layer 3 can be carried out on the approximate plane, guarantee the uniformity of heating carbon slurry layer 3, avoid the edge difference, thereby obviously improve the heating uniformity effect, and the conductive electrode 22 is arranged in groove 211, need not etching the whole copper layer, reduce the preparation cost and preparation time, reduce the environmental pollution risk in the preparation process, improve the preparation efficiency and performance of conductive film 100, and the conductive film 100 has good heat conduction performance.

[0039] In the embodiment, the substrate layer 1 is a PI layer, which has excellent mechanical properties, thermal stability, electrical insulation and chemical stability, thereby increasing the durability and reliability of the conductive film 100. The insulating bearing layer 2 is a UV glue layer, which is easy to form the groove 211 and ensure the stability of the groove 211. The depth of the groove 211 ranges from 10 μm to 100 μm, and the width of the groove 211 ranges from 10 μm to 100 μm. The groove 211 is filled with silver paste, and the conductive electrode 22 is formed after sintering. The silver paste can fill the groove 211 completely, i.e., the height of the conductive electrode 22 is the same as the depth of the groove 211. Figure 2 In other embodiments, the height of the conductive electrode 22 is slightly smaller than the depth of the groove 211. Figure 3 In other embodiments, the height of the conductive electrode 22 is slightly larger than the depth of the groove 211. In this case, the bearing face 22 is substantially flat, and the uniformity of the heating carbon slurry layer 3 is not affected. The thickness of the heating carbon slurry layer ranges from 10 μm to 200 μm. The groove 211 is in the form of a line or a grid. When the groove 211 is in the form of a grid, the grid can be in the form of a circle, a rectangle, a square, a diamond, a hexagon or a random polygon.

[0040] The conductive film 100 is taken as an example, and the preparation steps are as follows:

[0041] Step 1: PI substrate is selected as the substrate layer 1 of the heating conductive film 100, and the thickness of the PI substrate is 0.1 mm. Then, a layer of UV structural glue is coated on the first surface 11 of the PI substrate as the insulating bearing layer 21, and the thickness of the UV structural glue is the same as the thickness of the copper wire, i.e., 0.05 mm.

[0042] Step two: using the mold of the circuit pattern to imprint on the PI substrate coated with UV structural adhesive, forming the circuit groove 211 with the same shape as the required conductive electrode 22 circuit on the UV structural adhesive. The imprinting temperature is 100℃, the pressure is 1MPa, and the time is 10 minutes.

[0043] Step three: curing the structural adhesive with the imprinted circuit groove 211 to form the insulating support layer 21, so as to have good mechanical strength and electrical insulation performance. The curing temperature is 150℃, and the time is 1 hour.

[0044] Step four: filling metal paste in the circuit groove 211 of the cured UV structural adhesive, and then performing sintering and curing treatment to obtain a conductive electrode 22 equivalent to a copper wire. The filled metal paste is silver paste, and the sintering and curing temperature is 800℃, and the time is 2 hours.

[0045] Step five: using screen printing process to screen print a layer of carbon paste circuit on the support surface 23 where the obtained conductive electrode 22 is located, as a heating carbon paste layer for heating. The thickness of the heating carbon paste layer 3 is 0.1mm. In one embodiment, the carbon paste circuit is perpendicular to the conductive electrode 22.

[0046] Step six: curing the heating carbon paste layer 3 to have good thermal conductivity and electrical insulation performance. The curing temperature is 120℃, and the time is 2 hours.

[0047] Through the above steps, the conductive film 100, for example, a new energy battery pack PTC heating film, can be obtained, which has uniform heating effect, low preparation cost, light weight, low preparation time and environmental pollution risk, and good thermal conductivity.

[0048] Please refer to Figure 4 The utility model discloses another conductive film 200, compared with the conductive film 100, the conductive film 200 further includes the encapsulation layer 4. A layer of UV glue is coated on the heating carbon paste layer 3, and the encapsulation layer 4 is obtained after curing, which has sealing and insulation effect.

[0049] Please refer to Figure 5 The utility model discloses another conductive film 300, compared with the conductive film 100, the second surface 12 of the substrate layer 1 of the conductive film 300 also has the heating conductive layer 2 and the heating carbon paste layer 3 of layering. Two heating conductive layers 2 can operate simultaneously or separately, thereby improving the heating efficiency and increasing the service life.

[0050] Please refer to Figure 6 The utility model discloses another conductive film 400, compared with the conductive film 300, the conductive film 400 also includes two encapsulation layers 4, which are respectively arranged on the two heating carbon paste layers 3.

[0051] In order to make the above objects, features and advantages of the present application more obvious, the specific embodiments of the present application are described in detail above in combination with the drawings. In the above description, many specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from the above description, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited by the above disclosed specific embodiments. Moreover, each technical feature of the above described embodiments can be combined arbitrarily, and in order to make the description simple, each technical feature in the above described embodiments is not described in all possible combinations, however, as long as the combination of these technical features does not exist contradictory, it should be considered as the scope of the present application.

[0052] The above described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the present application. It should be pointed out that for those skilled in the art, on the premise of not departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A conductive film, characterized by, It comprises: a substrate layer comprising a first surface and a second surface arranged oppositely; a heating conductive layer arranged on the first surface of the substrate layer, the heating conductive layer comprising an insulating carrier layer with grooves and conductive electrodes formed by conductive material filled in the grooves, the side of the heating conductive layer away from the substrate layer being a carrier surface, and the conductive electrodes being exposed and distributed on the carrier surface; a heating carbon paste layer arranged on the carrier surface and in contact with the conductive electrodes.

2. The conductive film according to claim 1, wherein The substrate layer is one or a composite layer of PI layer, PET layer, PC layer or PMMA layer, and the thickness of the substrate layer ranges from 50 μm to 500 μm.

3. The conductive film of claim 1, wherein The insulating carrier layer is a photocuring glue layer or a thermocuring glue layer.

4. The conductive film according to claim 3, wherein The depth of the groove ranges from 10 μm to 100 μm, the width of the groove ranges from 10 μm to 100 μm, the groove comprises a bottom wall and side walls on both sides of the bottom wall, and the distance from the bottom wall to the first surface ranges from 2 μm to 20 μm.

5. The conductive film according to claim 4, wherein The conductive material filled in the groove is silver paste, copper powder, ITO or PEDOT to form conductive electrodes, and the filling rate of the conductive material in the groove ranges from 90% to 110%.

6. The conductive film of claim 1 wherein, The thickness of the heating carbon paste layer ranges from 10 μm to 200 μm.

7. The conductive film of claim 1 wherein, The conductive electrodes are distributed in a grid shape, and the grid is one of a circle, a rectangle, a square, a diamond, a hexagon and a random polygon.

8. The conductive film of claim 1 wherein, The heating conductive layer has two layers arranged on the first surface and the second surface respectively, and the heating carbon paste layer has two layers, each layer of the heating carbon paste layer being arranged on each layer of the heating conductive layer.

9. The conductive film of claim 1, wherein Further comprising an encapsulation layer arranged on the heating carbon paste layer, the encapsulation layer being a polymer layer or a cured glue layer.

10. The conductive film according to any one of claims 1 to 9, wherein The conductive film is a PTC heating film for new energy battery pack.

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