CN112103410A

CN112103410A - Flexible battery

Info

Publication number: CN112103410A
Application number: CN201910527729.7A
Authority: CN
Inventors: 韩玲莉
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2019-06-18
Filing date: 2019-06-18
Publication date: 2020-12-18
Anticipated expiration: 2039-06-18
Also published as: CN117276770A; CN112103410B

Abstract

The disclosure relates to a flexible battery, and belongs to the technical field of batteries. The flexible battery that this disclosure provided has better pliability, and deformability is better, is difficult for damaged in deformation process. The flexible battery includes: an electrode assembly and a package can. The packaging shell wraps the electrode assembly and comprises a rubber layer, a barrier layer and a bonding layer which are arranged in a stacked mode; the barrier layer is located between the rubber layer and the tie layer.

Description

Flexible battery

Technical Field

The present disclosure relates to the field of battery technology, and more particularly, to a flexible battery.

Background

In recent years, flexible batteries capable of bending deformation have become a new trend of batteries. The flexible battery can be widely applied to wearable electronic products and electronic products with folding screens or curved screens. When in use, the flexible battery adapts to different use forms of electronic products through bending. It is understood that the flexibility of the flexible battery is a key property for ensuring the quality of the flexible battery.

Disclosure of Invention

The present disclosure provides a flexible battery having better flexibility and deformation stability.

According to the flexible battery that this disclosed embodiment provided, flexible battery includes: an electrode assembly; the packaging shell wraps the electrode assembly and comprises a rubber layer, a barrier layer and a bonding layer which are arranged in a stacked mode; the barrier layer is located between the rubber layer and the tie layer.

In one embodiment, the system comprises; the bonding layer is positioned on one side of the barrier layer facing the electrode assembly; the rubber layer is located on a side of the barrier layer facing away from the electrode assembly.

In one embodiment, the rubber layer is attached to the barrier layer.

In one embodiment, a glue layer is disposed between the rubber layer and the barrier layer, the rubber layer being connected to the barrier layer by the glue layer.

In one embodiment, the material of the tie layer includes a rubber component.

In one embodiment, the material of the rubber layer and the rubber component comprise at least one of: nitrile rubber, styrene butadiene rubber, isoprene rubber and chloroprene rubber.

In one embodiment, the bonding layer is a composite material layer, the material of the bonding layer further comprising a resin component.

In one embodiment, the resin component in the tie layer comprises at least one of: polypropylene, polyethylene.

In one embodiment, the barrier layer is a metal foil, and the material of the barrier layer is selected from aluminum, copper, phosphor bronze, aluminum bronze, and copper alloy.

In one embodiment, the electrode assembly includes: a battery anode, a separator, and a battery cathode arranged in a stack; the flexible battery further includes: an anode terminal having one end connected to the battery anode and the other end located outside the package can; and a cathode terminal having one end connected to the cathode of the battery and the other end located outside the package can.

In one embodiment, the electrode assembly further comprises: an encapsulating inner casing encapsulating the battery anode, the separator, and the battery cathode.

The flexible battery provided by the present disclosure has at least the following beneficial effects:

the flexible battery provided by the embodiment of the disclosure improves the flexibility of the whole flexible battery by arranging the rubber layer in the packaging shell, and improves the deformation matching degree of the flexible battery and an external component. And the packaging shell is not easy to damage in the using process, so that the using stability and the safety of the flexible battery are improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram of a flexible battery shown in accordance with an exemplary embodiment;

FIG. 2 is a schematic diagram of a flexible battery shown in accordance with another exemplary embodiment;

FIG. 3 is a schematic diagram of a flexible battery shown in accordance with another exemplary embodiment;

fig. 4 is a schematic structural diagram illustrating a cross-section of an enclosure in a flexible battery according to an exemplary embodiment;

fig. 5 is a sectional view illustrating a combined structure of a package can and an electrode assembly in a flexible battery according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this application do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprises" or "comprising" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

The flexible battery is provided with a flexible packaging shell so as to ensure that the flexible battery can be bent or bent during the use process. In the related art, an aluminum plastic film is used to form a package housing. The inventors have found that the flexibility of the package can in the related art has room for further improvement to optimize the flexibility of the flexible battery.

Based on the above, the disclosed embodiments provide a flexible battery. Fig. 1 to 5 are schematic structural diagrams of flexible batteries provided according to different embodiments.

As shown in fig. 1, the flexible battery includes an electrode assembly 10, a package can 20 covering the electrode assembly 10, and electrode terminals 30 (connection parts not shown in the drawing) provided on the package can 20 and connected to the electrode assembly 10.

The package can 20 integrally encapsulates the electrode assembly 10, the electrode terminal 30, and the electrolyte. Wherein the package case 20 forms a package cavity 25, and the electrode assembly 10 and the electrolyte are located inside the package cavity 25. The electrode terminal 30 has one end connected to the electrode assembly 10 and the other end located outside the package cavity 25 for being coupled to a power supply interface of an external assembly.

In one embodiment, as shown in fig. 2, electrode assembly 10 includes a battery anode 11, a separator 12, and a battery cathode 13, which are stacked.

The battery anode 11 includes an anode current collector and an anode active material layer. Wherein the anode active material layer is provided on at least one surface of the anode current collector. Illustratively, the anode active material layer is coated on at least one side of the anode current collector. The battery cathode 13 includes a cathode current collector and a cathode active material. Wherein the cathode active material is provided on at least one surface of the cathode current collector. Illustratively, the cathode active material layer is coated on at least one side of the cathode current collector. Separator 12 is disposed between cell anode 11 and cell cathode 13, separating cell anode 11 from cell cathode 13.

The battery anode 11, the battery cathode 13 and the diaphragm 12 are made of flexible materials capable of bending and deforming. Illustratively, the battery anode 11 and the battery cathode 13 are prepared using metal foils such as copper foil, aluminum foil, cobalt foil, zinc foil, nickel foil, manganese foil, titanium foil, iron foil, silver foil, and the like. The separator 12 is made of a resin film such as a polypropylene film, a polyethylene film, or the like.

The electrode terminal 30 includes an anode terminal 31 and a cathode terminal 32. Wherein one end of the anode terminal 31 is connected to the battery anode 11 and the other end is exposed to the outside of the package can 20. One end of the cathode terminal 32 is connected to the battery cathode 13, and the other end is exposed to the outside of the package can 20. The portions of the anode terminal 31 and the cathode terminal 32 exposed outside the package housing 20 are used to mate with a power interface of an external device, so that the flexible battery supplies power to the external device.

In one embodiment, as shown in fig. 3, electrode assembly 10 further includes an encapsulating inner casing 14 encapsulating the cell anode 11, the cell cathode 13, the separator 12, and the electrolyte. The sealing performance of the flexible battery is further enhanced through the packaging inner shell 14, and the stable use of the flexible battery is guaranteed. The inner package casing 14 is made of a flexible material and is bent simultaneously with the electrode assembly 10 and the outer package casing 20 when in use.

Optionally, inner package housing 14 has a smooth surface and is curved to have a smooth curved surface. Or, optionally, inner package housing 14 includes a toughening structure. For example, the toughening structures include mating recesses and protrusions disposed on the surface of inner package housing 14. The toughening structure is wavy and is used to improve the toughness of inner package shell 14.

In one embodiment, as shown in fig. 4, the package housing 20 includes a rubber layer 21, a barrier layer 22, and an adhesive layer 23 in a laminated arrangement.

The barrier layer 22 serves to prevent impurities (e.g., moisture, etc.) outside the package can 20 from entering the package cavity 25, ensuring the safety of the electrode assembly 10 in use. Alternatively, the barrier layer 22 is made of a metal foil, which provides both barrier properties and bending properties of the barrier layer 22. Wherein the metal foil is made of aluminum, copper, phosphor bronze, aluminum bronze, copper alloy, etc.

The rubber layer 21 is disposed on one side of the barrier layer 22. As an example, the rubber layer 21 is directly attached to the barrier layer 22. For example, the rubber layer 21 is formed directly on the barrier layer 22 by spraying, coating, curtain coating, or the like. As another example, a rubber layer 24 is provided between the rubber layer 21 and the barrier layer 22, and the rubber layer 21 is connected to the barrier layer 22 through the rubber layer 24.

Alternatively, the rubber layer 21 has a thickness of 20 to 30 micrometers (μm), such as 23 μm, 25 μm, 27 μm, and the like.

Illustratively, the rubber layer 21 includes at least one of the following rubber components: nitrile rubber, styrene butadiene rubber, isoprene rubber, chloroprene rubber and fluororubber. Of course, the rubber layer 21 may also comprise other rubber components. It should be noted that, when the rubber layer 21 includes a plurality of rubber components, the rubber layer 21 further includes a modifier. The modifier is used for regulating and controlling the combination stability of different rubber components so as to optimize the mechanical property of the rubber layer 21.

The rubber layer 21 has good flexibility and strong deformability. In the embodiment of the present disclosure, by disposing the rubber layer 21 on the barrier layer 22, the overall flexibility of the package housing 20 is optimized, so that the package housing 20 is more easily bent. Accordingly, the flexible battery is facilitated to be bent in synchronization with the outer member, so that the flexible battery is fitted to the outer member as much as possible. For example, the deformation degree of the flexible battery is consistent with that of the flexible display screen, or the deformation degree of the flexible battery is consistent with that of the bracelet band.

The rubber layer 21 is elastic and is not easily cracked by bending for many times. Therefore, when the flexible battery provided by the embodiment of the disclosure is used, the situation that the packaging shell 20 is damaged due to bending is not easy to occur, the occurrence of situations such as battery ignition is reduced, and the stable and safe use of the flexible battery is ensured.

The adhesive layer 23 is provided on the side of the barrier layer 22 opposite the rubber layer 21. The adhesive layer 23 provides a barrier to prevent corrosive substances from damaging the barrier layer 22. And, the adhesive layer 23 also has an adhesive connection function, and the package housing 20 forms a package cavity 25 through the adhesion of the adhesive layer 23.

As for the connection mode of the adhesive layer 23 and the barrier layer 22, as shown in fig. 4, a glue layer 24 is provided between the adhesive layer 23 and the barrier layer 22, and the adhesive layer 23 is connected to the barrier layer 22 through the glue layer 24.

As for the material of the adhesive layer 23, as an example, the material of the adhesive layer 23 is a resin, such as polyethylene, polypropylene, cast polypropylene (CPP), or the like.

As another example, the material of the adhesive layer 23 includes a rubber component. For example, the material of the adhesive layer 23 is a rubber/resin composite material. The rubber/resin composite material is prepared by taking rubber and resin as main components through a physical blending or grafting blending process. Optionally, the rubber/resin composite further comprises a coupling agent or the like. The coupling agent is used for improving the interfacial properties of the rubber component and the resin component and ensuring that the bonding layer 23 has good mechanical properties and processability.

Optionally, the rubber component in the tie layer 23 includes at least one of: nitrile rubber, styrene butadiene rubber, isoprene rubber, chloroprene rubber and fluororubber. The resin component in the adhesive layer 23 includes at least one of: polyethylene, polypropylene (including cast polypropylene). Of course, other resin components and rubber components may also be selected, and the embodiments of the present disclosure are not particularly limited.

In this way, the rubber/resin composite adhesive layer 23 has better flexibility and deformability than the simple resin adhesive layer 23. Accordingly, the flexibility of the package housing 20 is further optimized, so that the deformation capability of the flexible battery is improved, and the stable and safe use of the flexible battery is guaranteed.

In one embodiment, as shown in fig. 5, the rubber layer 21 is located on the side of the barrier layer 22 facing away from the electrode assembly 10, i.e. the rubber layer 21 is facing the outside of the package cavity 25. In this way, the rubber layer 21 serves an external protection, so that the barrier layer 22 is protected from mechanical damage. The rubber layer 21 also has decorative properties, and improves the appearance of the flexible battery.

The adhesive layer 23 is located on the side of the barrier layer 22 facing the electrode assembly 10, i.e., the rubber layer 21 is located inside the package cavity 25. In this way, the barrier layer 22 and the corrosive liquid such as the electrolyte in the package cavity 25 are separated by the adhesive layer 23. Particularly in the case where the flexible battery does not include the encapsulating inner casing 14, the barrier layer 22 is effectively prevented from being corroded by the electrolyte by the adhesive layer 23.

According to the flexible battery provided by the embodiment of the disclosure, the rubber layer 21 is arranged in the packaging shell 20, so that the flexibility of the whole flexible battery is improved, and the deformation matching degree of the flexible battery and an external component is improved. And the packaging shell 20 is not easy to damage in the using process, so that the using stability and the safety of the flexible battery are improved.

It should be noted that, in the embodiments of the present disclosure, the flexible battery may be applied in a wearable device (e.g., a bracelet, a watch, glasses, etc.), a mobile terminal (e.g., a mobile phone, a tablet computer, etc.) having a flexible screen or a curved screen, an in-vehicle device, or a medical device.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A flexible battery, comprising:

an electrode assembly; and

the packaging shell wraps the electrode assembly and comprises a rubber layer, a barrier layer and a bonding layer which are arranged in a stacked mode; the barrier layer is located between the rubber layer and the tie layer.

2. The flexible battery of claim 1, wherein the tie layer is located on a side of the barrier layer facing the electrode assembly; the rubber layer is located on a side of the barrier layer facing away from the electrode assembly.

3. The flexible battery of claim 1, wherein the rubber layer is in bonded connection with the barrier layer.

4. The flexible battery of claim 1, wherein a glue layer is disposed between the rubber layer and the barrier layer, the rubber layer being connected to the barrier layer by the glue layer.

5. The flexible battery of claim 1, wherein the material of the tie layer comprises a rubber component.

6. The flexible battery of claim 5, wherein the material of the rubber layer and the rubber component comprise at least one of: nitrile rubber, styrene butadiene rubber, isoprene rubber, chloroprene rubber and fluororubber.

7. The flexible battery of claim 5, wherein the bonding layer is a composite material layer, the material of the bonding layer further comprising a resin component.

8. The flexible battery of claim 7, wherein the resin component in the bonding layer comprises at least one of: polypropylene, polyethylene.

9. The flexible battery of claim 1, wherein the barrier layer is a metal foil and the material of the barrier layer is selected from the group consisting of aluminum, copper, phosphor bronze, aluminum bronze, and copper alloy.

10. The flexible battery of claim 1, wherein the electrode assembly comprises: a battery anode, a separator, and a battery cathode arranged in a stack;

the flexible battery further includes: an anode terminal having one end connected to the battery anode and the other end located outside the package can; and a cathode terminal having one end connected to the cathode of the battery and the other end exposed to the outside of the package can.

11. The flexible battery of claim 10, wherein the electrode assembly further comprises: an encapsulating inner casing encapsulating the battery anode, the separator, and the battery cathode.