阅读说明：本技术 胶粘结构、应用所述胶粘结构的电池及电子装置 (Gluing structure, battery applying same and electronic device ) 是由 戴志芳 龙海 于 2020-03-25 设计创作，主要内容包括：一种胶粘结构,包括基材、第一胶层和第二胶层。所述基材的延伸率为30％～400％,所述基材包括相背的第一表面及第二表面。所述第一胶层粘接于所述第一表面。所述第二胶层粘接于所述第二表面。所述第一胶层在所述第二表面上的投影与所述第二胶层不重叠。本申请还提供一种应用上述胶粘结构的电池及电子装置,所述胶粘结构有利于改善电芯跌落过程失效情况,同时有利于提高所述电池的安全性。(An adhesive structure comprises a base material, a first adhesive layer and a second adhesive layer. The elongation of the base material is 30% -400%, and the base material comprises a first surface and a second surface which are opposite. The first glue layer is adhered to the first surface. The second glue layer is adhered to the second surface. The projection of the first glue layer on the second surface is not overlapped with the second glue layer. The application also provides a battery and an electronic device applying the adhesive structure, wherein the adhesive structure is favorable for improving the failure condition of the falling process of the battery core and is simultaneously favorable for improving the safety of the battery.)

1. An adhesive construct comprising:

a substrate comprising a first surface and a second surface opposite to each other;

the first adhesive layer is adhered to the first surface; and

the second adhesive layer is adhered to the second surface;

it is characterized in that the preparation method is characterized in that,

the elongation of the base material is 30% -400%, and the projection of the first adhesive layer on the second surface is not overlapped with the second adhesive layer.

2. The adhesive structure of claim 1, wherein the substrate is a single layer structure or a multi-layer composite structure, the substrate has a thickness of 6 μm to 30 μm, and the substrate comprises at least one of a polypropylene film, a polyethylene terephthalate film, a polyimide film, a polyvinyl chloride film, and a multi-layer co-extruded polyolefin heat shrinkable film.

3. The adhesive structure according to claim 1, wherein the thickness of the first adhesive layer is 1 μm to 20 μm, and the first adhesive layer is a spot adhesive and/or a stripe adhesive.

4. The adhesive structure of claim 3, wherein the first adhesive layer is formed of first adhesive dots, and each of the first adhesive dots has an adhesive area of 0.5mm with respect to the first surface²～10mm²。

5. The adhesive structure of claim 4, wherein the first adhesive layer comprises a plurality of first adhesive dots arranged at intervals, and the distance between any two adjacent first adhesive dots is 0.2mm to 10 mm.

6. The adhesive structure according to claim 3, wherein the thickness of the second adhesive layer is 1 μm to 20 μm, and the second adhesive layer is a spot adhesive and/or a stripe adhesive.

7. The adhesive structure of claim 6, wherein the second adhesive layer comprises second adhesive dots, and each of the second adhesive dots has an adhesive area of 0.5mm with respect to the second surface²～10mm²。

8. The adhesive structure of claim 7, wherein the second adhesive layer comprises a plurality of spaced second adhesive dots, and the distance between any two adjacent second adhesive dots is 0.2mm to 10 mm.

9. The adhesive structure of claim 1, wherein a projection of the first adhesive layer on the second surface is spaced from the adjacent second adhesive layer by 0.5mm to 30 mm.

10. The adhesive structure according to any one of claims 1 to 9, wherein the first adhesive layer is a hot melt adhesive, and the first adhesive layer has no tackiness at normal temperature and increases in tackiness when heated; the second adhesive layer is made of at least one of polyacrylate, epoxy resin, rubber and organic silica gel.

11. The adhesive structure of claim 10, wherein the viscosity of the second adhesive layer is 0.01N/mm to 0.5N/mm at room temperature.

12. A battery, characterized in that the battery comprises the adhesive structure according to any one of claims 1-11.

13. The battery of claim 12, wherein the battery further comprises a cell and an encapsulation film, the adhesive structure is adhered between the cell and the encapsulation film, the first adhesive layer is adhered to the encapsulation film, and the second adhesive layer is adhered to the cell.

14. An electronic device, characterized in that the electronic device comprises a battery according to any of claims 12-13.

Technical Field

The application relates to an adhesive structure, a battery using the adhesive structure and an electronic device using the battery.

Background

With the mature application of consumer electronics, customers pay more and more attention to the risk of the whole machine application. For example, the demand for drop resistance of electronic products is increasing. The battery is an important component of electronic products, and has requirements on falling resistance. When the battery falls along with an electronic product, the battery is easy to be accommodated in a battery packaging film, and a battery core breaks a top seal or a side seal of the packaging film, so that the safety and the service life of the battery are influenced.

Disclosure of Invention

In view of the above, it is necessary to provide an adhesive structure that improves safety and improves failure, and a battery and an electronic device using the same.

The application provides an it constructs to glue, includes substrate, first glue film and second glue film. The substrate comprises a first surface and a second surface which are opposite. The first adhesive layer is adhered to the first surface, and the second adhesive layer is adhered to the second surface. The elongation of the base material is 30% -400%, and the projection of the first adhesive layer on the second surface is not overlapped with the second adhesive layer.

Further, the base material is of a single-layer structure or a multi-layer composite structure, the thickness of the base material is 6-30 micrometers, and the base material comprises at least one of a polypropylene film, a polyethylene terephthalate film, a polyimide film, a polyvinyl chloride film and a multi-layer co-extruded polyolefin heat shrinkable film.

Furthermore, the thickness of the first adhesive layer is 1-20 μm, and the first adhesive layer is a dot adhesive and/or a strip adhesive.

Furthermore, the first glue layer is composed of first glue dots, and the bonding area of each first glue dot and the first surface is 0.5mm²～10mm²。

Furthermore, the first glue layer comprises a plurality of first glue points arranged at intervals, and the distance between any two adjacent first glue points is 0.2-10 mm.

Furthermore, the thickness of the second adhesive layer is 1-20 μm, and the second adhesive layer is a dot adhesive and/or a strip adhesive.

Furthermore, the second glue layer is formed by second glue dotsThe bonding area of each second glue point and the second surface is 0.5mm²～10mm²。

Furthermore, the second glue layer comprises a plurality of second glue points arranged at intervals, and the distance between any two adjacent second glue points is 0.2-10 mm.

Furthermore, the distance between the projection of the first adhesive layer on the second surface and the adjacent second adhesive layer is 0.5-30 mm.

Further, the first adhesive layer is a hot melt adhesive and is selected from at least one of polyethylene, polypropylene, copolymers of ethylene and other olefins, polyesters, polyurethanes, styrene and block copolymers thereof, and the first adhesive layer is non-adhesive at normal temperature and has increased viscosity after being heated; the second adhesive layer is made of at least one of polyacrylate, epoxy resin, rubber and organic silica gel.

Further, the viscosity of the second adhesive layer is 0.01N/mm-0.5N/mm at normal temperature.

A battery comprising an adhesive construction as described above.

Furthermore, the battery also comprises an electric core and a packaging film, wherein the adhesive structure is adhered between the electric core and the packaging film, the first adhesive layer is adhered with the packaging film, and the second adhesive layer is adhered with the electric core.

An electronic device comprises the battery.

The elongation rate of the base material in the adhesive structure is 30% -400%, so that the base material can have a good stretching effect on the premise of keeping the bearing capacity of the adhesive layer, the adhesive structure is not easy to lose effectiveness due to breakage of the base material under the action of external force, and the service life and the safety of a battery using the adhesive structure are further improved. Furthermore, an adhesive structure in the battery is bonded between the battery core and the packaging film, so that the relative displacement between the battery core and the packaging film can be effectively reduced; moreover, due to the effect of the elongation of the base material and the staggered arrangement of the first adhesive layer and the second adhesive layer, when the battery is subjected to an external force, the adhesive structure provides a buffer effect for the battery core, so that the electrolyte leakage caused by the fact that the top seal or the side seal of the battery is opened is avoided; meanwhile, the buffer action also reduces the local stress of the bonding part of the aluminum foil on the outer ring of the battery cell and the adhesive structure, so that the risk that the battery cell is torn due to the fact that the battery cell drives the adhesive structure to pull the packaging film when the battery is subjected to an external force is reduced, and the safety performance of the battery is improved.

Drawings

Fig. 1 is a schematic structural view of an adhesive structure according to an embodiment of the present application.

Fig. 2 is a plan view of an adhesive structure according to an embodiment of the present application.

Fig. 3 is a schematic structural view of an adhesive structure according to an embodiment of the present application.

Fig. 4 is a schematic structural view of an adhesive structure according to an embodiment of the present application.

Fig. 5 is a schematic structural view of an adhesive structure according to an embodiment of the present application.

Fig. 6 is a schematic structural view of an adhesive structure according to an embodiment of the present application.

Fig. 7 is a schematic structural view of an adhesive structure according to an embodiment of the present application.

Fig. 8 is a schematic structural view of an adhesive structure according to an embodiment of the present application.

Fig. 9 is a schematic structural diagram illustrating that an adhesive structure is bonded between an encapsulation film and a battery cell according to an embodiment of the present application.

Description of the main elements

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 are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all 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 are described in detail below. The features of the following examples/embodiments and examples/embodiments may be combined with each other without conflict.

Referring to fig. 1 to 8, an adhesive structure 100 includes a substrate 10, a first adhesive layer 30, and a second adhesive layer 50.

The substrate 10 includes a first surface 11 and a second surface 13 disposed opposite to each other. The elongation of the base material 10 is 30% to 400%. The base material 10 can be stretched under the action of external force, so that the adhesive structure is not easy to lose effectiveness due to the breakage of the base material under the action of external force. If the elongation of the substrate 10 is too low, no effective cushioning effect is provided; if the elongation of the substrate 10 is too high, an effective fixing effect cannot be achieved. Preferably, the elongation of the base material 10 is 100% to 200%. In some embodiments, the substrate 10 is selected from, but not limited to, at least one of a polypropylene film (PP), a polyethylene film (PE), a polyethylene terephthalate film (PET), a polyimide film (PI), a polyvinyl chloride film (PVC), and a multilayer coextruded polyolefin heat shrinkable film (POF). The thickness of the base material 10 is in the range of 6 to 30 μm. Preferably, the thickness of the substrate 10 is 8 to 12 μm. The thickness of the substrate 10 is too low and the process requirements are higher, which is more difficult to achieve; too high a thickness affects the overall thickness of the bonded structure 100, which in turn affects the cell energy density. The thickness of the substrate 10 is the vertical distance between the first surface 11 and the second surface 13.

In some embodiments, referring to fig. 1 and 2, the substrate 10 may have a single-layer structure. In other embodiments, the substrate 10 may be a multi-layer composite structure, for example, referring to fig. 3, the substrate 10 includes a first substrate layer 101 and a second substrate layer 102 stacked on each other, and the first substrate layer 101 and the second substrate layer 102 may be respectively selected from but not limited to one of a polypropylene film, a polyethylene terephthalate film, a polyimide film, a polyvinyl chloride film, and a multi-layer co-extruded polyolefin heat shrinkable film. The first substrate layer 101 may be bonded to the second substrate layer 102 by an adhesive layer 20. Referring to fig. 4, the first substrate layer 101 and the second substrate layer 102 can be further bonded together by melting. In other embodiments, the number of base layers included in the substrate 10 is not limited to the first base layer and the second base layer.

In some embodiments, the first surface 11 may be further provided with microstructures (not shown), such as recesses or protrusions, to increase the adhesion with the first adhesive layer 30. The second surface 13 may also be provided with microstructures (not shown) to increase the adhesion with the second adhesive layer 50.

The first glue layer 30 is adhered to the first surface 11, the second glue layer 50 is adhered to the second surface 13, and a projection of the first glue layer 30 on the second surface 13 along a direction perpendicular to the second surface 13 does not overlap with the second glue layer 50.

The thickness of the first adhesive layer 30 can be 1-20 μm, so that the adhesive force of the first adhesive layer is ensured, the overall thickness of the adhesive structure is reduced, and the energy density loss of the battery core is reduced when the adhesive structure is applied to a battery. Preferably, the first paste layer 30 ranges from 4 μm to 6 μm.

The first adhesive layer 30 may be made of a hot melt adhesive. The first adhesive layer 30 has no tackiness at normal temperature and increases in tackiness after being heated. When applying the bonding structure 100, due to the above-mentioned characteristics of the first glue layer 30, it is convenient to initially adjust the relative position between the bonding structure 100 and the object to be bonded with the first glue layer 30, and bond the object under heat and/or pressure after adjustment.

In some embodiments, the thermosol may be selected from, but is not limited to, polyethylene, polypropylene, copolymers of ethylene with other olefins, polyesters, polyamines, styrene, and block copolymers thereof.

In some embodiments, referring to fig. 1-4 and 5, the first adhesive layer 30 includes at least one dot-shaped first adhesive dot 31a, wherein an adhesion area of each first adhesive dot 31a to the first surface 11 is 0.5mm²～10mm². The shape of each first glue dot 31a can be circular, oval, rectangular, polygonal or other regular or irregular shape.

In the present embodiment, the first glue layer 30 includes a plurality of first glue dots 31a arranged at intervals. The distance between any two adjacent first glue points 31a is 0.2 mm-10 mm, so that the gluing structure can provide a good buffering effect for an object bonded with the gluing structure while ensuring a good bonding effect. The first glue dots 31a may be arranged at equal intervals or at unequal intervals.

The thickness of the second adhesive layer 50 can be 1-20 μm, so that the adhesive structure can provide a good buffer effect for an object bonded with the adhesive structure while ensuring a good bonding effect, and energy density is lost due to an excessively thick adhesive layer. Preferably, the second adhesive layer 50 ranges from 4 μm to 6 μm.

The material of the second adhesive layer 50 may include, but is not limited to, at least one of polyacrylate, epoxy resin, rubber, and silicone. The viscosity of the second adhesive layer 50 at normal temperature is 0.01N/mm-0.5N/mm.

Referring to fig. 1-4 and 8, the second adhesive layer 50 includes at least one dot-shaped second adhesive dot 51a, wherein an adhesion area of each second adhesive dot 51a and the first surface 11 is 0.5mm²～10mm². The shape of each second glue dot 51a can be circular, oval, rectangular, polygonal or other regular or irregular shape. The material of each second glue dot 51a may include, but is not limited to, at least one of polyacrylate, epoxy resin, rubber, and silicone.

In this embodiment, the second adhesive layer 50 includes a plurality of second adhesive dots 51a arranged at intervals. Wherein, the distance between any two adjacent second glue points 51a is 0.2 mm-10 mm. The second glue dots 51a may be arranged at equal intervals or at unequal intervals.

In some embodiments, referring to fig. 5, fig. 6 and fig. 8, the first adhesive layer 30 may include at least one block-shaped first adhesive portion 31 b. The first glue portions 31b are different from the first glue dots 31a in that each first glue portion 31b has a larger bonding area with the first surface 11, so that the first glue portions 31b are in a continuous block shape. When the first adhesive layer 30 includes a plurality of first adhesive portions 31b, the first adhesive portions 31b are disposed at intervals. In some embodiments, each first adhesive portion 31b has an elongated shape and a width equal to the width of the base material 10, and a plurality of elongated first adhesive portions 31b are disposed at intervals to form the first glue layer 30. The first adhesive layer 30 and the second adhesive layer 50 are defined to be arranged at intervals along a first direction, and on a plane where the first surface 11 or the second surface 13 is located, a second direction is perpendicular to the first direction. The width direction of the base material 10 and the width direction of the first adhesive portion 31b are the second direction.

In some embodiments, referring to fig. 5, fig. 6 and fig. 8, the second adhesive layer 50 may include at least one block-shaped second adhesive portion 51 b. The second glue portions 51b are different from the second glue sites 51a in that each second glue portion 51b has a larger bonding area with the first surface 11, so that the second glue portions 51b are in a continuous block shape. When the second adhesive layer 50 includes a plurality of second adhesive portions 51b, the second adhesive portions 51b are disposed at intervals. In some embodiments, each second adhesive portion 51b has an elongated shape and a width equal to the width of the base material 10, and a plurality of elongated second adhesive portions 51b are disposed at intervals to form the second adhesive layer 50.

The distance between the projection of the first adhesive layer 30 on the second surface 13 and the adjacent second adhesive layer 50 is 0.5 mm-30 mm, so that the adhesive structure can provide a good buffer effect for an object bonded with the adhesive structure while ensuring a good bonding effect. In this application, the spacing between two elements refers to the closest distance between the edges of two elements that are close to each other. For example, the distance between the projection of the first glue layer 30 on the second surface 13 and the adjacent second glue layer 50 refers to the distance between the edge of the adjacent second glue layer 50 close to the projection of the first glue layer 30 on the second surface 13 and the edge of the adjacent second glue layer 50 close to the first glue layer 30.

In the present embodiment, please refer to fig. 9, which illustrates an example of the adhesive structure 100 being adhered between the battery cell 200 and the packaging film 300 in the battery, wherein the adhesive structure 100 is applied to the battery (not shown).

The first adhesive layer 30 in the adhesive structure 100 is adhered to the packaging film 300, and the second adhesive layer 50 is adhered to the battery cell 200.

When the battery is subjected to an external force (e.g., falls), the adhesive structure 100 is bonded between the battery cell 200 and the packaging film 300, so that the relative displacement between the battery cell 200 and the packaging film 300 can be effectively reduced; moreover, due to the effect of the elongation of the base material 10 and the staggered arrangement between the first adhesive layer and the second adhesive layer, when the battery is subjected to an external force, the adhesive structure 100 can be stretched, so that a buffer effect is provided for the battery cell 200, and the electrolyte leakage caused by the fact that the top seal or the side seal of the battery is opened is avoided; meanwhile, the buffer action also reduces the local stress of the bonding part of the packaging film 300 and the adhesive structure 100, so that the risk that the battery cell is torn due to the fact that the battery cell drives the adhesive structure to pull the packaging film 300 when the battery is subjected to an external force is reduced.

The present application will be specifically described below by way of comparative examples and examples. It should be understood that the parameters in the present application are not limited to the contents described in the comparative examples and examples, and can be specifically selected according to actual needs.

Adhesive structures corresponding to examples 1 to 100 and comparative examples 1 to 6 were prepared as shown in table 1 below, and the adhesive structures corresponding to examples 1 to 100 and comparative examples 1 to 6 were identical to each other except for the parameters shown in the table. The above adhesive structures were applied to the same-structured batteries respectively for drop tests, and the corresponding drop structures were recorded in table 1 below. The glue interval is the distance between glue points or the distance between gluing parts in the glue layers positioned on the same side of the base material; by "continuous block" is meant that each side of the substrate is coated with a glue layer. The concrete method of the drop test comprises the following steps: the battery is dropped 18 times from a height of 1.8m in a manner that the upper and lower surfaces are grounded or four corners are grounded, if the pressure drop of the battery is less than 15mV and the phenomena of liquid leakage, fire, smoke generation and aluminum foil tearing in the battery core do not occur, the battery passes the test, 10 batteries are respectively tested in each group of examples or comparative examples, and the passing ratio is the dropping result.

TABLE 1

Comparative example 1	10	10	0.15	(Continuous)	150％	12	PE monolayer	Continuous block shape	0/10
										Comparative example 2	10	10	0.15	(Continuous)	150％	12	PET monolayer	Continuous block shape	0/10
Comparative example 3	10	10	0.15	(Continuous)	150％	12	PE/PET composite	Continuous block shape	0/10
										Comparative example 4	10	10	0.15	0.1	25％	12	PET monolayer	Quadrilateral shape	3/10
Comparative example 5	10	10	0.15	0.1	500％	12	PET monolayer	Quadrilateral shape	2/10
										Comparative example 6	10	10	0.15	0.1	25％	12	PET monolayer	Circular shape	3/10

As can be seen from the drop results shown in table 1, the batteries of comparative examples 1 to 3, which were bonded by the common continuous double-sided adhesive paper, failed the drop test when dropped from a high place. Specifically, when the battery falls, impact force is easily concentrated on the bonding position between the double-sided adhesive paper and the packaging film, so that the battery fails after falling (for example, the battery core or the packaging film is torn at the bonding position). The anti-drop effect of the batteries of examples 1 to 36 in this case was significantly better than that of comparative examples 1 to 3.

The elongation of the base material 10 in the adhesive structure 100 in the application is 30% -400%, so that the base material 10 can have a good stretching effect on the premise of maintaining the bearing capacity of an adhesive layer, and the adhesive structure is not easy to fail due to the breakage of the base material under the action of external force. The adhesive structure 100 is bonded between the battery cell and the packaging film 300 in the battery, so that the relative displacement between the battery cell 200 and the packaging film 300 can be effectively reduced; moreover, due to the effect of the elongation of the base material 10 and the staggered arrangement between the first adhesive layer and the second adhesive layer, the adhesive structure 100 is stretched, so that a buffer effect is provided for the battery cell 200, and the electrolyte leakage caused by the top seal or the side seal of the battery being flushed away is avoided; meanwhile, the buffer action also reduces the local stress of the bonding part of the packaging film 300 and the adhesive structure 100, so that the battery cell is prevented from driving the adhesive structure to pull the packaging film 300 to cause the battery cell to be torn when the battery is subjected to an external force, and the safety performance of the battery is further improved. In addition, it is obvious to those skilled in the art that other various corresponding changes and modifications can be made according to the technical idea of the present application, and all such changes and modifications should fall within the protective scope of the present application.