CN215007557U

CN215007557U - Novel conductive film

Info

Publication number: CN215007557U
Application number: CN202120287909.5U
Authority: CN
Inventors: 臧世伟
Original assignee: Chongqing Jinmei New Material Technology Co Ltd
Current assignee: Chongqing Jinmei New Material Technology Co Ltd
Priority date: 2021-02-01
Filing date: 2021-02-01
Publication date: 2021-12-03
Anticipated expiration: 2031-02-01

Abstract

The utility model relates to a novel conductive film, including sandwich structure's first film substrate layer, mix layer and second film substrate layer, mix the layer including being streamlined distribution's heat-conducting layer, still include with the conducting layer that the heat-conducting layer links up each other, first film substrate layer with the surface of second film substrate layer has all plated the metal level. The utility model discloses an interlayer structure, add in the middle of first film substrate layer and second film substrate layer and mix the layer, mix the layer including the heat-conducting layer that is streamlined distribution and the conducting layer that links up each other with the heat-conducting layer, this structure greatly improves the intensity of novel film, make it in the production process of lithium ion battery accessory, avoid the fracture, thereby the resource has been saved, the cost of lithium ion battery has been saved, and the heat-conducting layer has also improved the heat conductivity of novel film, thereby prevent the lithium ion battery phenomenon of generating heat because the great arouses of film internal resistance, also can avoid taking place the dangerous situation of burning.

Description

Novel conductive film

Technical Field

The utility model relates to a film manufacturing field, specific theory relates to a novel conductive film.

Background

The lithium ion battery has the advantages of high energy density, low self-discharge rate, high charging efficiency and the like, so the lithium ion battery is the most widely used energy situation in the world at present, the development of the movable energy also accelerates the development of electronic technology, such as mobile phones, new energy automobiles and the like, but in a large number of application processes, people find an important accessory of the lithium ion battery, namely a conductive film, and in the production process, the film is broken due to insufficient strength of the film, so that the resources are greatly wasted, and the manufacturing cost of the lithium ion battery is increased.

On the other hand, in the application process of the conductive film in the prior art, the lithium ion battery is heated due to large internal resistance, and even flammable dangerous situations occur.

The above problems are worth solving.

Disclosure of Invention

In order to overcome prior art's film intensity not high, damage easily to and in lithium ion battery's application, the defect that heat conductivility is not enough, the utility model provides a novel conductive film.

The utility model discloses technical scheme as follows:

the utility model provides a novel conductive film, includes sandwich structure's first film substrate layer, mixes layer and second film substrate layer, its characterized in that, mix the layer including being streamlined the heat-conducting layer that distributes, still include with the conducting layer that the heat-conducting layer links up each other.

According to the above scheme the utility model discloses, its characterized in that, first film substrate layer with the surface of second film substrate layer has all plated the metal level.

Further, the metal layer includes one of metal aluminum and metal copper.

According to the above scheme the utility model discloses, its characterized in that, first film substrate layer with second film substrate layer includes PP, PE or PET.

According to above-mentioned scheme the utility model discloses, its characterized in that, the heat-conducting layer with be equipped with between the conducting layer and mend the lithium layer.

According to the above scheme the utility model discloses, its characterized in that, the heat-conducting layer is one of heat conduction silica gel, aluminium oxide, magnesium oxide, zinc oxide, aluminium nitride, boron nitride, carborundum.

According to the above scheme the utility model discloses, its characterized in that, the conducting layer is one of graphite alkene, carbon nanotube, graphite fiber, conductive carbon black.

According to the above scheme the utility model discloses, its characterized in that, the heat-conducting layer with the thickness of conducting layer is 200 ~ 500 nm.

According to the above scheme the utility model discloses, its beneficial effect lies in:

the utility model adopts the sandwich structure, a mixing layer is added between the first film substrate layer and the second film substrate layer, and the mixing layer comprises a heat conduction layer in streamline distribution and a conductive layer mutually connected with the heat conduction layer, the structure greatly improves the strength of the novel film, so that the novel film has enough structural strength to avoid fracture in the production process of lithium ion battery accessories, thereby saving resources and the cost of the lithium ion battery; on the other hand, the heat conduction layer improves the heat conductivity of the novel film, so that the heating phenomenon of the lithium ion battery caused by large internal resistance of the film is prevented, and the dangerous case of combustion can be avoided.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

In the figure, 1, a first film base material layer; 2. a second thin film substrate layer; 3. a mixed layer; 31. a heat conductive layer; 32. a conductive layer; 4. a metal layer; 5. and (5) supplementing lithium.

Detailed Description

For better understanding of the objects, technical solutions and technical effects of the present invention, the present invention will be further explained with reference to the accompanying drawings and embodiments. It is to be noted that the following examples are only for explaining the present invention and are not intended to limit the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a number" is two or more unless specifically defined otherwise.

Example one

As shown in fig. 1, a novel conductive film comprises a first film substrate layer 1, a mixed layer 3 and a second film substrate layer 2 with a sandwich structure, namely, a structure of the mixed layer is arranged between the first film substrate layer 1 and the second film substrate layer 2, wherein the mixed layer 3 comprises a heat conduction layer 31 with streamline distribution, and further comprises a conductive layer 32 mutually connected with the heat conduction layer 31.

The utility model discloses a sandwich structure adds in the middle of first film substrate layer and second film substrate layer and mixes the layer, and mixes the layer and include heat-conducting layer and conducting layer, has improved the intensity and the heat conductivility of novel film.

The streamlined distribution of heat-conducting layer 31 indicates that the heat-conducting layer surface is the non-smooth surface, but the structure of wave face, therefore during heat-conducting layer 31 and the pressfitting of conducting layer 32, links up each other and fuses, and the bonding is inseparabler, can greatly improve the intensity of novel film, makes it possess sufficient structural strength and avoid the fracture in the production process of lithium ion battery accessory to save the resource, saved lithium ion battery's cost.

The heat conducting substance of the heat conducting layer greatly improves the heat conductivity of the novel film, so that the heating phenomenon of the lithium ion battery caused by large internal resistance of the film is prevented, and the dangerous case of combustion can be avoided; the conductive substance in the conductive layer 32 greatly improves the conductivity of the novel film.

The surfaces of the first film substrate layer 1 and the second film substrate layer 2 are both plated with a metal layer 4, and preferably, the metal layer 4 comprises one of metal aluminum and metal copper.

The utility model discloses in, first film substrate layer 1 and second film substrate layer 2 include PP, PE or PET.

The utility model provides a thickness of heat-conducting layer 31 and conducting layer 32 is 200 ~ 500 nm.

In an alternative embodiment, the thickness of the thermally conductive layer is 200nm and the thickness of the electrically conductive layer is 200 nm.

In an alternative embodiment, the thickness of the thermally conductive layer is 200nm and the thickness of the electrically conductive layer is 500 nm.

In an alternative embodiment, the thickness of the thermally conductive layer is 500nm and the thickness of the electrically conductive layer is 200 nm.

In an alternative embodiment, the thickness of the thermally conductive layer is 500nm and the thickness of the electrically conductive layer is 500 nm.

In an alternative embodiment, the thickness of the thermally conductive layer is 350nm and the thickness of the electrically conductive layer is 350 nm.

Example two

The present embodiment provides a novel conductive film, which has the same structure as the first embodiment, except that the heat conducting layer 31 may specifically include: any one of heat-conducting silica gel, aluminum oxide, magnesium oxide, zinc oxide, aluminum nitride, boron nitride and silicon carbide. The conductive layer 32 may specifically include any one of graphene, carbon nanotubes, graphite fibers, and conductive carbon black.

In this embodiment, a lithium supplement layer 5 is disposed between the heat conducting layer 31 and the conducting layer 32, and lithium metal in the lithium supplement layer 5 is a lithium ion battery as a lithium source to supplement lithium ions consumed by the lithium ion battery due to initial charging and the like.

Comparative experiment

Experiment one

The utility model provides a tensile strength's test to illustrate the utility model discloses a novel conductive film structure's tensile strength, and the experimental film sample of embodiment and comparative example all do as follows and cut the processing: the resulting film was cut into test pieces having a length of 25cm and a width of 2 cm.

Comparative example: the difference of the method is that a PP film with the thickness of 2um is used as a film substrate layer, a vacuum coating technology is adopted, and metal copper with the thickness of 1um is laminated on the surface of the substrate.

The experimental operating method comprises the following steps: fixing one end of the film sample at the upper end of a tensile tester by using the tensile tester, fixing the other end of the film sample at the lower end of the tensile tester, and testing the tensile strength at a speed of 100mm/min, wherein each sample is tested twice and the unit is kgf/cm²The test results are shown in Table 1.

Table 1: tensile strength comparison table

Sample (I)	Results of the experiment (kgf/cm)²)
		Comparative examples 1 to 1	5.235
Comparative examples 1 to 2	5.332
		Examples 1 to 1	6.201
Comparative examples 1 to 2	6.322

According to above-mentioned contrast experiment can know, adopt the utility model discloses a novel conductive film structure compares and can obtain better structural strength in traditional film structure.

Experiment two

The utility model provides a test of thermal conductivity to explain the utility model discloses a novel conductive film structure's thermal conductivity.

The experimental operating method comprises the following steps:

the samples were tested using a DRX-3A thermal conductivity tester (hot wire method) and the results are shown in Table 2.

Table 2: heat-conducting performance comparison table

Sample (I)	Thermal resistance
		Comparative example 2-1	0.022
Comparative examples 2 to 2	0.022
		Example 2-1	0.022
Comparative examples 1 to 2	0.016

The thermal resistance θ is L/(λ S) according to the formula, where λ is the thermal conductivity, L is the material length, and S is the heat transfer area.

Known by the formula, under material length, heat transfer area are unchangeable, the thermal resistance is more its coefficient of heat conductivity less, and its heat dissipation is just slower more, can know according to above-mentioned contrast experiment, and the thermal resistance of embodiment is less than the comparative example, and its heat conduction rate is higher than the comparative example, consequently, adopts the utility model discloses a novel conductive film structure's lithium ion battery heat conduction rate is higher to can greatly promote thermal conductivity.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a novel conductive film, includes sandwich structure's first film substrate layer, mixes layer and second film substrate layer, its characterized in that, mix the layer including being streamlined the heat-conducting layer that distributes, still include with the conducting layer that the heat-conducting layer links up each other.

2. The novel conductive film as claimed in claim 1, wherein the surfaces of the first film substrate layer and the second film substrate layer are plated with metal layers.

3. The novel conductive film as claimed in claim 2, wherein the metal layer comprises one of metallic aluminum and metallic copper.

4. The novel conductive film of claim 1, wherein said first film substrate layer and said second film substrate layer comprise PP, PE or PET.

5. The novel conductive film according to claim 1, wherein a lithium supplement layer is provided between the heat conductive layer and the conductive layer.

6. The novel conductive film of claim 1, wherein the heat conducting layer is one of a heat conducting silica gel, alumina, magnesia, zinc oxide, aluminum nitride, boron nitride, and silicon carbide.

7. The novel conductive film as claimed in claim 1, wherein the conductive layer is one of graphene, carbon nanotubes, graphite fibers, and conductive carbon black.

8. The novel conductive film as claimed in claim 1, wherein the thickness of the heat conducting layer and the thickness of the conductive layer are both 200-500 nm.