WO2019062373A1

WO2019062373A1 - Flexible battery

Info

Publication number: WO2019062373A1
Application number: PCT/CN2018/100846
Authority: WO
Inventors: 杨思枬
Original assignee: 辉能科技股份有限公司; 英属开曼群岛商辉能控股股份有限公司
Priority date: 2017-09-29
Filing date: 2018-08-16
Publication date: 2019-04-04
Also published as: CN109585897B; CN109585897A; JP3229241U; DE212018000257U1

Abstract

Provided is a flexible battery, comprising: a positive electrode collector layer, which has a first external surface and a first internal surface; a negative electrode collector layer, which has a second external surface and a second internal surface; a frame, which is sandwiched between the first internal surface and the second internal surface to form an enclosed region; and an electrochemical system layer, which is arranged in the enclosed region and is adjacent to the side surface of the frame, wherein, at least one of the first external surface and the second external surface is provided with a stress reinforcement material, and the thickness ratio of the stress reinforcement material to the positive electrode collector layer or the negative electrode collector layer is between 0.25 to 6. The external surface of at least one collector layer is provided with the stress reinforcement material to improve the structural stress of the collector layer, such that the collector layer is less prone to creases or deformation from which same cannot recover after the flexible battery undergoes repeated bending.

Description

Flexible battery

Technical field

The present invention relates to a flexible battery, and more particularly to a flexible battery having a stress reinforcing material on a collector layer.

Background technique

In recent years, with the development of technology, various electronic devices, such as portable phones, watches, cameras, cameras, tablet computers, notebook computers, etc., have become more and more styles, and many electronic devices have unique shapes, such as curved mobile phones. Wearable smart watches, smart bracelets, etc. These electronic devices all require power supplies. Electronic devices with unique shapes often require flexible batteries, and existing batteries are often too rigid to conform to the shape of these electronic devices, even if the battery is barely installed in the electronic device. It may also cause the packaging of electronic equipment to be unsatisfactory. Therefore, it can be set in a non-planar flexible battery to solve this problem.

However, in the process of repeated bending of the battery, it is necessary to consider the problems that may occur after the collector layer is subjected to stress. At present, in order to make the battery more flexible, the collector layer tends to be lighter and thinner to increase the bendability. However, when the collector layer is bent by force, it is easy to be squeezed by the pole layer. Produces an acute angle. Moreover, the collector layer usually uses a metal material. When the metal material is subjected to an external force exceeding the elastic range, a crystal slip may occur, or a problem of crystal dislocations may occur, so that the surface of the collector layer cannot be recovered. Deformation.

When the above or other problems occur, the collector layer is deformed, and the collector layer and the active material layer are often peeled off, thereby lowering the capacity of the battery and shortening the battery life.

Summary of the invention

In view of the above problems, an object of the present invention is to provide a flexible battery which is provided with a stress reinforcing material on a collector layer without impeding the bending ability of the battery to improve the structural stress of the collector layer and avoid power collection. The above problem occurs in the layer.

In order to achieve the above object, the present invention provides a flexible battery comprising: a positive electrode collector layer having a first outer surface and a first inner surface; a negative electrode collector layer having a second outer surface and a second inner surface; a frame sandwiched between the first inner surface and the second inner surface to form a sealing area; an electrochemical system layer disposed in the enclosing area and adjacent to the side surface of the plastic frame; and a stress reinforcing material On the first outer surface and/or the second outer surface, and the thickness ratio of the stress reinforcement to the positive electrode collector layer or the negative electrode collector layer is between 0.25 and 6.

The electrochemical system layer includes a positive electrode active material layer, a negative electrode active material layer and an electrical insulating layer, and the positive electrode active material layer is adjacent to the first inner surface of the positive electrode current collecting layer, and the negative electrode active material layer and the negative electrode current collecting layer are The inner surfaces are adjacent to each other, and the electrically insulating layer is interposed between the positive active material layer and the negative active material layer.

Wherein, the thickness of the positive electrode collector layer is between 5 μm and 40 μm. Wherein, the thickness of the negative electrode collector layer is between 2 μm and 20 μm. Wherein, the stress reinforcing material has a thickness of 10 μm to 30 μm.

Wherein, the stress reinforcing material is selected from the group consisting of polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PC), polystyrene (PS), and polyimide. (polyimide), nylon (nylon), polyethylene terephthalate, polyurethane, acrylic, epoxy, silicone, and combinations thereof.

Wherein, an adhesive layer is further included between the stress reinforcement and the first outer surface, at least one of the stress reinforcement and the second outer surface.

Wherein, the thickness of the adhesive layer is not more than 5 μm.

Wherein, the adhesive layer is selected from the group consisting of polyurethane, Acrylic, epoxy, silicone, and combinations thereof.

The Young's modulus of the stress reinforcing material is similar to the positive electrode current collecting layer and the negative electrode current collecting layer.

Wherein, the enclosed area is sealed.

In addition, the stress reinforcing material of the present invention has certain structural strength and ductility, and the stress reinforcing material should select a material whose Young's modulus is close to the collector layer, and the thickness of the stress reinforcing material is smaller than the collector layer, and the current is collected by the positive electrode. A stress reinforcing material is disposed on the layer and the negative collector layer to enhance the surface strength of the collector layer, so that the collector layer has a certain structural stress, and it is difficult to generate an unrecoverable deformation when bent.

DRAWINGS

1A-1C are schematic structural views of an embodiment of the present invention;

2 is a schematic structural view of another embodiment of the present invention.

Description of the reference numerals

10-flexible battery 20-positive collector layer

120-first inner surface 122-first outer surface

14-Negative current collection 140-Second inner surface

142-second outer surface 16-plastic frame

18-stress reinforcement 20-electrochemical system layer

202-positive active material layer 204-negative active material layer

206-electrical insulation layer 22-adhesive layer

Detailed ways

In order to make the content of the present invention easier to understand, it should be noted that the terms used in the specification should not be limited to the general meaning or the meaning of the dictionary, but should allow the inventor to properly define the term for the best interpretation. Based on the meanings and concepts that are consistent with the technical aspects of the present invention, it is explained. Based on the above, the following uses the terms used in the specification:

1. "and/or" and "at least one of" includes any and all combinations of one or more of the associated listed items.

2. "Collector layer" means a region where electrons are collected and released, usually composed of a metal, particularly a metal which does not react with an active material. The collector layer described in the present invention means a positive electrode collector layer and/or a negative electrode collector layer.

3. "Electrochemical system layer" means the region of the electrochemical reaction. In the present invention, the collector layer is not included in the electrochemical system layer, and its electron exchange occurs at the interface between the electrochemical system layer and the collector layer.

4. The electrical insulation in the “electrical insulation layer” refers to the isolation of electrons. That is to say, the electrical insulation layer refers to the area where the electrons can flow but does not affect the flow of ions. Usually, it is sandwiched between the positive electrode and the negative electrode. In the present invention, the electron flow between the positive electrode active material layer and the negative electrode active material layer is isolated, and is selected from the group consisting of liquid, solid, colloidal, and/or combinations thereof.

5. "Enclosed area" means an area that is isolated from the external environment. In the present invention, the enclosing area is enclosed by the collector layer and the plastic frame, and the electrochemical system layer is disposed in the enclosing area. In other words, the electrochemical system layer of the present invention passes through the collector layer and the glue. The enclosure of the box is isolated from the outside world.

6. The position, size, range, and the like of each component shown in the drawings of the present invention may not represent actual positions, sizes, ranges, and the like. The invention is not limited to the disclosure in the drawings.

It is an object of the present invention to provide a flexible battery which is provided with a stress reinforcing material on a collector layer, and the stress reinforcing material requires at least the following conditions:

a. The stress reinforcement material needs to have a certain structural strength to provide the structural stress of the collector layer.

Avoid unrecoverable deformation after the flexible battery is bent.

b. In order to maintain the flexible characteristics of the flexible battery, the stress reinforcement needs to have a certain flexibility.

Next, in accordance with the spirit of the present invention described above, the following is explained in more detail:

1A to 1C, which are schematic structural views of an embodiment of a flexible battery disclosed in the present invention. The flexible battery 10 includes a positive electrode current collecting layer 12, a negative electrode current collecting layer 14, a plastic frame 16, a stress reinforcing material 18, and an electrochemical system layer 20, wherein the stress reinforcing material 18 is disposed on the first outer surface of the positive electrode current collecting layer 12. 122, as shown in FIG. 1A, or the stress reinforcing material 18 is disposed on the second outer surface 142 of the negative electrode collector layer 14, as shown in FIG. 1B, or the stress reinforcing material 18 is disposed on the positive electrode collector layer 12. The first outer surface 122 and the second outer surface 142 of the negative current collector layer 14 are as shown in FIG. 1C. Referring to FIG. 1C , the positive electrode current collector layer 12 , the negative electrode current collector layer 14 and the plastic frame 16 form a sealing area, and the electrochemical system layer 20 is disposed in the enclosed area. The electrochemical system layer 20 includes a positive electrode active material layer 202, a negative electrode active material layer 204, and an electrical insulating layer 206, wherein the positive electrode active material layer 202 is adjacent to the first inner surface 120 of the positive electrode current collector layer 12 and the negative electrode active material layer 204. Adjacent to the second inner surface 140 of the negative electrode current collector layer 14, the electrically insulating layer 206 is interposed between the positive electrode active material layer 202 and the negative electrode active material layer 204.

In the continuation, the Young's modulus of the stress reinforcement material is similar to that of the collector layer, and the thickness of the stress reinforcement material and the collector layer is in a certain range, because the Young's modulus of the stress reinforcement material is The difference between the number and the collector layer is too much, and the thickness of the stress reinforcement material is too different from the collector layer. When the stress is applied, the bending degree may be different. Once the deformation of the stress reinforcement material and the collector layer When the difference of the shape variables is too large, it will be affected by the surface deformation of each other, and the structure with smaller deformation variables will not be deformed with the adjacent layer structure, and the occurrence of the texture or even the occurrence of cracks will occur. Therefore, the stress reinforcing material selects a material having a Young's modulus similar to that of the collector layer, and the thickness ratio of the stress reinforcing material to the collector layer is between 0.25 and 6.

For example, if the positive electrode collector layer is made of stainless steel, the thickness may be between 5 μm and 15 μm. If aluminum is selected as the material, the thickness may be between 25 μm and 40 μm, and if the negative electrode collector layer is stainless steel. The material may have a thickness of between 5 μm and 15 μm. If copper is selected as the material, the thickness may be between 2 μm and 20 μm. According to the above, since different materials have different material rigidity, the substrates of different materials are used. The thickness range is not the same. For the stress reinforcing material, the preferred thickness is not more than 30 μm, otherwise the excessively thick stress reinforcing material may become difficult to bend due to its own thickness, but for a thin thickness of the stress reinforcing material, for example, less than 10 μm, it is difficult to provide the purpose of strengthening the structural strength. For the stress reinforcing material, the thickness of the preferred stress reinforcing material is between 10 μm and 12 μm, which can exert a better effect, and in terms of the material of the stress reinforcing material, Common and alternative materials such as, but not limited to, polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PC), polystyrene (PS), polyacyl Imine (polyimide), nylon (nylon), polyethylene terephthalate, polyurethane, acrylic, epoxy, silicone, etc., but The actual application is not limited to the types of materials mentioned above.

In addition, the thickness of the collector layer is not greater than the active material layer due to the active material layer

It is applied to the inner side of the collector layer, and because the active material layer has a relatively low ductility due to its own material, if the thickness of the active material layer is too thick, it is not only prone to activity.

The problem of brittle fracture of the material layer causes the active material layer to pierce the collector layer, or the collector layer may excessively pull the active material layer to cause the collector layer to rupture.

In addition, the stress reinforcing material is disposed on the collector layer by coating, spraying, or printing, or an adhesive layer may be added between the stress reinforcing material and the collector layer to bond Stress reinforcement and collector layer.

Please refer to FIG. 2 , which is a structural diagram of a flexible battery incorporating an adhesive layer. The difference from FIG. 1A to FIG. 1C is that the flexible battery 10 has an adhesive layer 22 , and the adhesive layer 22 is sandwiched on the first outer surface. 122 and between the stress reinforcing material 18 and/or between the second outer surface 142 and the stress reinforcing material 18, in other words, between the positive electrode current collecting layer 12 and the stress reinforcing material 18, and the negative electrode current collecting layer 14 and At least one of the stress reinforcing members 18 is provided with an adhesive layer 22, and FIG. 2 only shows that the first outer surface 122 of the positive electrode current collector layer 12 and the second outer surface 142 of the negative electrode current collector layer 14 are provided with an adhesive layer. 22 and the case of the stress reinforcing material 18, of course, when the adhesive layer 22 may exist only between at least one of the positive electrode current collecting layer 12 and the stress reinforcing material 18, the negative electrode current collecting layer 14, and the stress reinforcing material 18, the actual situation Depending on where the stress stiffener 18 is disposed, for example, when the stress stiffener 18 is disposed only on the first outer surface 122, the adhesive layer 22 is also disposed only between the first outer surface 122 and the stress stiffener 18.

In the continuation, the adhesive layer is composed of an adhesive, and the adhesive may be composed of polyurethane, acrylic, epoxy, silicone, etc., and has a thickness of not more than 5 μm.

As mentioned in point 5 of the vocabulary explanation, the electrochemical system layer is isolated from the outside by the encapsulation of the collector layer and the plastic frame, so that the enclosed area is sealed and does not come into contact with the external environment. That is to say, the plastic frame needs to have the function of water-blocking gas, and needs to have flexibility. Therefore, the material of the plastic frame of the present invention is selected from silicone, and the silica gel can achieve the function of water-blocking gas, and it is matured. It still has flexibility afterwards. In addition, the plastic frame at least partially overlaps the positive electrode collector layer and the negative electrode collector layer in the orthogonal projection direction, that is, in the orthographic projection direction, the plastic frame does not need to completely overlap the positive electrode collector layer and the negative electrode collector layer.

The flexible battery on the market uses an aluminum plastic film as a packaging material for the battery to accommodate a cathode, an anode, a separator, and an electrolyte. Different from the present invention, the present invention uses a collector layer and a plastic frame as a package, that is, the collector layer not only collects and releases electrons, but also isolates the electrochemical system layer from the outside together with the plastic frame, and reflects the market. The flexible battery is isolated from the outside by the aluminum film. Therefore, the present invention is quite different from the flexible battery structure in which an aluminum plastic film is generally used.

In summary, the present invention provides a stress reinforcing material on the collector layer to improve the surface strength of the collector layer. When the collector layer has a certain structural stress, it is less likely to wrinkle or sharp when bent, or Unrecoverable deformation, so that even if the flexible battery is repeatedly bent, it can maintain good capacitance and battery life.

However, the above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All changes or modifications that are within the scope of the invention are intended to be included within the scope of the invention.

Claims

A flexible battery, comprising:

a positive collector layer having a first outer surface and a first inner surface; a negative collector layer having a second outer surface and a second inner surface;

a plastic frame interposed between the first inner surface and the second inner surface to form a sealing area;

An electrochemical system layer disposed in the enclosed area and adjacent to a side surface of the plastic frame;

Wherein at least one of the first outer surface and the second outer surface is provided with a stress reinforcing material, and a thickness ratio of the stress reinforcing material to the positive current collecting layer or the negative current collecting layer is between 0.25 and 6 .
The flexible battery according to claim 1, wherein the electrochemical system layer comprises a positive active material layer, a negative active material layer and an electrical property sandwiched between the positive active material layer and the negative active material layer. An insulating layer, the positive active material layer is adjacent to the first inner surface, and the negative active material layer is adjacent to the second inner surface.
The flexible battery according to claim 1, wherein the positive electrode collector layer has a thickness of from 5 μm to 40 μm.
The flexible battery according to claim 1, wherein the negative electrode collector layer has a thickness of from 2 μm to 20 μm.
The flexible battery according to claim 1, wherein the stress reinforcing material

The thickness is between 10 μm and 30 μm.
The flexible battery according to claim 1, wherein the stress reinforcing material is selected from the group consisting of polyethylene terephthalate, polyvinyl chloride, polyethylene, polypropylene, polystyrene, polyimide, and nylon. , polyethylene terephthalate, polyurethane, acrylic resin, epoxy resin, silica gel and combinations thereof.
The flexible battery according to claim 1, further comprising an adhesive layer between the stress reinforcement and the first outer surface, at least one of the stress reinforcement and the second outer surface.
The flexible battery according to claim 7, wherein the adhesive layer has a thickness of not more than 5 μm.
The flexible battery according to claim 7, wherein the adhesive layer is selected from the group consisting of polyurethane, acrylic resin, epoxy resin, silica gel, and combinations thereof.
The flexible battery according to claim 1, wherein the Young's modulus of the stress reinforcing material is similar to the positive electrode collector layer and the negative electrode collector layer.
The flexible battery of claim 1 wherein the enclosed area is hermetic.