CN214244283U

CN214244283U - Heat dissipation film, battery and electronic device

Info

Publication number: CN214244283U
Application number: CN202022330125.4U
Authority: CN
Inventors: 欧阳兆华; 唐威; 钟毅斌; 蔡家榕
Original assignee: Dongguan Nvt Technology Co Ltd
Current assignee: Dongguan Nvt Technology Co Ltd
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2021-09-21
Anticipated expiration: 2030-10-19

Abstract

A heat dissipation film comprises a protective layer, a graphite layer and a double-sided adhesive layer which are sequentially stacked. The thickness ratio of the protective layer to the graphite layer is greater than 1:3 and less than 1: 1. The protective layer covers the surface of the graphite layer, so that the condition that the graphite layer is directly exposed to the outside and is easy to damage is reduced. The double-sided adhesive layer is used for providing viscosity, so that graphite in the graphite layer is bonded together, and the falling powder of the graphite layer is reduced. The graphite layer can be used as a good heat conduction and dissipation material, is bonded on the surface of an electrical element (such as a battery cell) with heat dissipation requirements through a double-sided adhesive layer, and provides excellent heat dissipation performance for the electrical element. The application also provides a battery and an electronic device. This application can dispel the heat to electric core.

Description

Heat dissipation film, battery and electronic device

Technical Field

The application relates to the technical field of energy storage, in particular to a heat dissipation film, a battery and an electronic device.

Background

With the popularization of consumer electronics products such as notebook computers, mobile phones, handheld game consoles, tablet computers, mobile power sources, unmanned aerial vehicles and the like, the requirements of people on the safety performance of batteries are more and more strict.

However, the battery generates a large amount of heat during the course of heavy current charging and discharging and overcharge, and if the heat cannot be dissipated to the outside of the battery in time, the internal temperature of the battery is too high, causing a series of side reactions, reducing the performance of the battery, and even causing safety problems such as fire and explosion.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above disadvantages in the prior art, it is necessary to provide a heat dissipation film capable of effectively dissipating heat.

In addition, it is also necessary to provide a battery having the heat dissipation film and an electronic device having the battery.

The application provides a heat dissipation membrane, including protective layer, graphite layer and the double faced adhesive tape layer of folding in proper order and establishing. The thickness ratio of the protective layer to the graphite layer is greater than 1:3 and less than 1: 1. When the heat dissipation film of this application was applied to electric core surface, the graphite layer can give off the heat that electric core produced to the external world as the heat dissipation medium, satisfied the heat dissipation demand of electric core.

In some possible implementations, the protective layer is a conductive layer, and the conductive layer is bonded to one side of the graphite layer by an acrylic adhesive. The protective layer can be grounded through the lead, so that the heat dissipation film can achieve the effects of electromagnetic shielding and static electricity prevention while realizing effective heat dissipation.

In some possible implementations, the protective layer is a plastic layer, and the plastic layer is bonded to one side of the graphite layer by a conductive adhesive.

In some possible implementations, the protective layer is a single-sided adhesive layer, the single-sided adhesive layer includes a substrate layer and a bonding layer disposed on one side of the substrate layer, and the bonding layer is bonded to one side of the graphite layer.

In some possible realization modes, the number of the graphite layers is at least two, two adjacent graphite layers are bonded by double-sided adhesive tapes, and the thickness of each graphite layer is 0.0175mm to 0.04 mm. Through setting up two-layer graphite layer at least, can reduce the condition that falls the powder easily when setting up the great graphite layer of single layer thickness when guaranteeing the radiating effect of heat dissipation membrane.

In some possible implementations, the porosity of the graphite layer is greater than 60%. The graphite layer has a high specific surface area and thus a high thermal conductivity.

In some possible implementations, the protective layer has a thickness of 0.01mm to 0.05mm, and the double-sided adhesive layer has a thickness of 0.01mm to 0.05 mm.

The application also provides a battery, which comprises the battery core. The battery also comprises the heat dissipation film, and the heat dissipation film is bonded on the surface of the battery core through the double-sided adhesive layer. The graphite layer can be used as a heat dissipation medium to dissipate heat generated by the battery cell to the outside, and the heat dissipation requirement of the battery cell is met.

In some possible implementations, a label sticker is adhered to the protective layer.

The application also provides an electronic device comprising the battery.

Drawings

Fig. 1 is a schematic structural diagram of a heat dissipation film according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a heat dissipation film according to another embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a heat dissipation film according to another embodiment of the present disclosure.

Fig. 4 is a schematic structural diagram of a battery according to an embodiment of the present disclosure.

Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Description of the main elements

Battery 1

Electronic device 2

Protective layer 10

Substrate layer 11

Adhesive layer 12

Graphite layer 20

Double-sided adhesive tape 21

Double-sided adhesive layer 30

Release film layer 40

Acrylic adhesive 50

Conductive adhesive 60

Heat

dissipation film

100, 200, 300

Battery cell 101

Outer cover 1011

Tab 1012

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1, an embodiment of the present application provides a heat dissipation film 100, which includes a protective layer 10, a graphite layer 20, and a double-sided adhesive layer 30 stacked in sequence. The thickness ratio of the protective layer 10 to the graphite layer 20 is more than 1:3 and less than 1: 1. The graphite layer 20 contains graphite, and can be used as a good heat conducting and dissipating material. The protective layer 10 covers the surface of the graphite layer 20, so that the situation that the graphite layer 20 is directly exposed to the outside and is easily damaged is reduced. The double-sided adhesive layer 30 is used to provide adhesiveness, so that the graphite in the graphite layer 20 is bonded together, thereby reducing dusting of the graphite layer 20, and meanwhile, the heat dissipation film 100 can be bonded to the surface of an electrical component (e.g., a battery cell) requiring heat dissipation through the double-sided adhesive layer 30.

This application is through setting up graphite layer 20 in heat dissipation membrane 100, and when heat dissipation membrane 100 was applied to electric core surface, graphite layer 20 can regard as the heat dissipation medium to give off the heat that electric core produced to the external world, satisfied the heat dissipation demand of electric core. Due to the crystal grain orientation of the graphite, the graphite layer 20 can conduct heat uniformly along two directions of the plane where the graphite layer 20 is located, so that the heat can be conducted to all positions of the graphite layer 20 quickly and uniformly and dissipated outwards. Moreover, the graphite layer 20 is made of a soft material, which is beneficial to improving the flexibility of the heat dissipation film 100, so that the heat dissipation film 100 can be attached to a flat or curved surface. When the thickness ratio of the protective layer 10 to the graphite layer 20 is less than or equal to 1:3, the protective layer 10 is too thin, and the protective effect on the graphite layer 20 is limited; when the thickness ratio of the protective layer 10 to the graphite layer 20 is 1:1 or more, the protective layer 10 is too thick, that is, the graphite layer 20 is too thin for heat dissipation in the case of a constant total thickness of the heat dissipation film 100.

In one embodiment, the particle size of the graphite in the graphite layer 20 is 800 to 1000 mesh, preferably 200 to 400 mesh. The carbon element content of the graphite is not less than 98%.

During preparation, the expanded graphite is expanded in a heating source and then put on a conveyer belt, and the graphite passing through the conveyer belt is compacted by a press, so that the graphite layer 20 is prepared. Wherein the porosity of the graphite layer 20 is greater than 60%. That is, the graphite layer 20 has a high specific surface area and thus has a high thermal conductivity.

As shown in fig. 1, in one embodiment, the protective layer 10 is a conductive layer, and the conductive layer is adhered to one side of the graphite layer 20 by an acrylic adhesive 50. At this time, the protective layer 10 may be grounded through a wire, so that the heat dissipation film 100 can achieve the electromagnetic shielding and antistatic effects while achieving effective heat dissipation.

In one embodiment, the conductive layer may be a conductive cloth layer. The conductive cloth layer takes fiber cloth as a base material, and a metal layer is electroplated on the surface of the conductive cloth layer after pretreatment, so that the fiber cloth has the metal characteristic. Further, the conductive cloth layer may be one of nickel-plated conductive cloth, gold-plated conductive cloth, copper-plated conductive cloth, and the like. The substrate may be a polyester fiber cloth. In another embodiment, the conductive layer may also be a metal layer having a conductive function, such as a copper foil layer, an aluminum foil layer, or the like.

In one embodiment, the number of graphite layers 20 is at least two, two adjacent graphite layers 20 are bonded by double-sided adhesive tape 21, and each graphite layer 20 has a thickness of 0.0175mm to 0.04 mm. Through setting up two-layer graphite layer 20 at least, can guarantee that the gross thickness of graphite layer 20 is great in heat dissipation membrane 100, and then guarantee heat dissipation membrane 100's radiating effect, simultaneously, still be favorable to reducing the condition of easy fault or falling the powder when setting up the great graphite layer of single layer thickness. In this case, the thickness ratio of the protective layer 10 and the graphite layer 20 refers to the ratio of the thickness of the protective layer 10 to the total thickness of at least two graphite layers 20.

In one embodiment, the heat dissipation film 100 further includes a release film layer 40, and the double-sided adhesive layer 30 is bonded between the graphite layer 20 and the release film layer 40. The release film layer 40 facilitates packaging and transportation of the heat dissipating film 100. When the heat dissipation film 100 is used, the release film layer 40 may be torn off to expose the double-sided adhesive layer 30, and then the heat dissipation film 100 may be bonded to the surface of the battery cell through the double-sided adhesive layer 30. In one embodiment, the release film layer 40 may be a Polyester (PET) release film or a Polyethylene (PE) release film.

In one embodiment, the thickness of the protective layer 10 is 0.01mm to 0.05 mm. The thickness of the double-sided adhesive layer 30 is 0.01mm to 0.05 mm.

Referring to fig. 2, another embodiment of the present application further provides a heat dissipation film 200. The difference from the heat dissipation film 100 is that the protection layer 10 is a plastic layer. In one embodiment, the plastic layer may be a Polyimide (PI) layer, a polyethylene terephthalate (PET) layer, or a Polycarbonate (PC) layer. The plastic layer is bonded to one side of the graphite layer 20 by a conductive adhesive 60. At this time, the protective layer 10 has an insulating effect.

Further, the side of the plastic layer away from the conductive adhesive 60 may be provided with micro or nano fibers for improving the puncture resistance of the protective layer 10.

The conductive paste 60 includes a matrix resin and a conductive filler mixed in the matrix resin. The matrix resin serves to provide an adhesive effect to bond the conductive fillers together. The matrix resin may be at least one selected from epoxy resin, acrylate resin, and polyvinyl chloride, etc. The conductive filler may be selected from powders of gold, silver, copper, aluminum, zinc, iron or nickel.

Referring to fig. 3, another embodiment of the present application further provides a heat dissipation film 300. The difference from the heat dissipation film 300 is that the protective layer 10 is a single-sided adhesive layer, the single-sided adhesive layer includes a substrate layer 11 and a bonding layer 12 disposed on one side of the substrate layer 11, and the bonding layer 12 is bonded to one side of the graphite layer 20.

Referring to fig. 4, the present application also provides a battery 1, which includes a battery core 101 and a heat dissipation film 100 (or heat dissipation films 200 and 300). The heat dissipation film 100 is bonded to the surface of the battery cell 101 through the double-sided adhesive layer 30. The graphite layer 20 can be used as a heat dissipation medium to dissipate heat generated by the battery core 101 to the outside.

Wherein, a label sticker (not shown) can be disposed on the protection layer 10. Wherein, the label sticker can be provided with a code, and the identification information of the battery 1 is recorded in the code. Further, the code may be a number, letter, or a combination of numbers and letters having a specific rule. When the protective layer 10 is a single-sided adhesive layer (as shown in fig. 3), the label sticker may be disposed on the substrate layer 11.

In one embodiment, the battery cell 101 includes a housing 1011, an electrode assembly and an electrolyte (not shown) disposed within the housing 1011, and a tab 1012 electrically connected to the electrode assembly, the tab 1012 protruding from the housing 1011 and electrically connected to a protection plate (not shown). The housing 1011 may be a package bag sealed with an aluminum-plastic film. That is, the battery cell 101 may be a soft-package battery cell. At this time, the case 1011 includes a case body for accommodating the electrode assembly and the electrolyte, and a top sealing edge and a side sealing edge connected to the case body, and the tab 1012 protrudes from the top sealing edge. The label sticker may be disposed on the upper surface and/or the lower surface of the housing body. Of course, in another embodiment, the battery cell 101 is not limited to a soft package battery cell, and may also be a steel-clad battery cell or an aluminum-clad battery cell, and the application is not limited thereto.

The battery 1 of the present application includes, among others, any device in which electrochemical reactions can take place, such as all kinds of primary batteries, secondary batteries, fuel cells, solar cells or capacitors. In particular, the battery 1 may be a lithium secondary battery including a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, and a lithium ion polymer secondary battery.

Referring to fig. 5, the present application further provides an electronic device 2 having the battery 1. The battery 1 of the present application is suitable for electronic devices 2 in various fields. In one embodiment, the battery 1 of the present application may be used in, but is not limited to, a notebook computer, a pen-input computer, a mobile computer, an electronic book player, a cellular phone, a portable facsimile machine, a portable copier, a portable printer, a headphone, a video recorder, a liquid crystal television, a portable cleaner, a portable CD player, a mini-disc, a transceiver, an electronic organizer, a calculator, a memory card, a portable recorder, a radio, a backup power source, a motor, an automobile, a motorcycle, a power-assisted bicycle, a lighting fixture, a toy, a game machine, a clock, an electric tool, a flashlight, a camera, a large household battery, a lithium ion capacitor, and the like.

Although the present application has been described in detail with reference to preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present application.

Claims

1. The heat dissipation film is characterized by comprising a protective layer, a graphite layer and a double-sided adhesive layer which are sequentially stacked, wherein the thickness ratio of the protective layer to the graphite layer is more than 1:3 and less than 1: 2;

the protective layer satisfies one of the following conditions:

the protective layer is a conductive layer, and the conductive layer is bonded to one side of the graphite layer through an acrylic adhesive;

the protective layer is a plastic layer, and the plastic layer is bonded on one side of the graphite layer through a conductive adhesive; or

The protective layer is a single-sided adhesive layer, the single-sided adhesive layer comprises a substrate layer and a bonding layer arranged on one side of the substrate layer, and the bonding layer is bonded on one side of the graphite layer.

2. The heat dissipating film according to claim 1, wherein the number of the graphite layers is at least two, two adjacent graphite layers are bonded by a double-sided adhesive tape, and each graphite layer has a thickness of 0.0175mm to 0.04 mm.

3. The heat spreading film of claim 1 wherein the graphite layer has a porosity greater than 60%.

4. The heat dissipating film of claim 1, wherein the protective layer has a thickness of 0.01mm to 0.05mm, and the double-sided adhesive layer has a thickness of 0.01mm to 0.05 mm.

5. A battery, which comprises a battery core, and is characterized in that the battery further comprises the heat dissipation film as claimed in any one of claims 1 to 4, and the heat dissipation film is bonded to the surface of the battery core through the double-sided adhesive layer.

6. The battery of claim 5, wherein a label sticker is adhered to the protective layer.

7. An electronic device comprising the battery according to any one of claims 5 to 6.