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CN109585897B - Flexible battery - Google Patents

Flexible battery Download PDF

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Publication number
CN109585897B
CN109585897B CN201710908079.1A CN201710908079A CN109585897B CN 109585897 B CN109585897 B CN 109585897B CN 201710908079 A CN201710908079 A CN 201710908079A CN 109585897 B CN109585897 B CN 109585897B
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CN
China
Prior art keywords
layer
current collecting
collecting layer
flexible battery
negative
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Application number
CN201710908079.1A
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Chinese (zh)
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CN109585897A (en
Inventor
杨思枬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Prologium Holding Inc
Prologium Technology Co Ltd
Original Assignee
Prologium Holding Inc
Prologium Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Prologium Holding Inc, Prologium Technology Co Ltd filed Critical Prologium Holding Inc
Priority to CN201710908079.1A priority Critical patent/CN109585897B/en
Priority to DE212018000257.6U priority patent/DE212018000257U1/en
Priority to PCT/CN2018/100846 priority patent/WO2019062373A1/en
Priority to JP2020600024U priority patent/JP3229241U/en
Publication of CN109585897A publication Critical patent/CN109585897A/en
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Publication of CN109585897B publication Critical patent/CN109585897B/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/121—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/1245—Primary casings; Jackets or wrappings characterised by the material having a layered structure characterised by the external coating on the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/136—Flexibility or foldability
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The present invention provides 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 rubber frame clamped between the first inner surface and the second inner surface to form an enclosed area; the electrochemical system layer is arranged in the enclosed area and is adjacent to the side surface of the rubber frame; wherein, at least one of the first outer surface and the second outer surface is provided with a stress reinforcement material, the thickness ratio of the stress reinforcement material to the anode current collecting layer or the cathode current collecting layer is between 0.25 and 6, and the stress reinforcement material is arranged on the outer surface of at least one current collecting layer to improve the structural stress of the current collecting layer, so that the current collecting layer is not easy to generate wrinkles or unrecoverable deformation after the flexible battery is repeatedly bent.

Description

Flexible battery
Technical Field
The present invention relates to a flexible battery, and more particularly, to a flexible battery having a stress reinforcement member on a current collecting layer.
Background
In recent years, with the development of technology, various electronic devices, such as: portable phones, watches, cameras, video cameras, tablet computers, notebook computers, and the like are increasingly being produced, and many electronic devices have unique shapes, such as curved phones, wearable smartwatches, smartbands, and the like. These electronic devices require a power source, electronic devices with unique shapes often require flexible batteries, and existing batteries are often too rigid to conform to the shapes of these electronic devices, and even if the batteries are reluctantly installed in the electronic devices, packaging of the electronic devices may be unsatisfactory, and therefore, flexible batteries that can be disposed on non-planar surfaces provide one solution to this problem.
However, during the repeated bending of the battery, it is necessary to consider the problems that the collector layer may generate after being subjected to stress. At present, in order to make the battery more compliant with the flexible characteristic, the current collecting layer tends to be designed to be thinner and lighter so as to increase the flexibility, however, when the current collecting layer is bent by a force, an acute angle is easily generated by the extrusion of the pole layer. Moreover, the collector layer is usually made of a metal material, and when the metal material is subjected to an external force exceeding the elastic range, a problem of crystal slip (slip) or crystal dislocations (dislocations) may occur, so that the surface of the collector layer is deformed without being restored.
When the above or other problems occur, the current collecting layer is deformed, and then the current collecting layer and the active material layer are often peeled off, so that the capacity of the battery is reduced, and the service life of the battery is shortened.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a flexible battery in which a stress reinforcement is provided on a current collecting layer without hindering the bending capability of the battery, so as to increase the structural stress of the current collecting layer and prevent the current collecting layer from suffering from the above problems.
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 current collector layer having a second outer surface and a second inner surface; the rubber frame is clamped between the first inner surface and the second inner surface to form an enclosed area; the electrochemical system layer is arranged in the enclosed area and is adjacent to the side surface of the rubber frame; and the stress reinforcing material is arranged on the first outer surface and/or the second outer surface, and the thickness ratio of the stress reinforcing material to the positive electrode current collecting layer or the negative electrode current collecting layer is between 0.25 and 6.
The electrochemical system layer comprises a positive active material layer, a negative active material layer and an electrical insulating layer, wherein the positive active material layer is adjacent to a first inner surface of the positive current collecting layer, the negative active material layer is adjacent to a second inner surface of the negative current collecting layer, and the electrical insulating layer is clamped between the positive active material layer and the negative active material layer.
Wherein the thickness of the positive collector layer is between 5 [ mu ] m and 40 [ mu ] m.
Wherein the thickness of the negative electrode collector layer is between 2 mu m and 20 mu m.
Wherein the thickness of the stress reinforcement material is between 10 mu m and 30 mu m.
Wherein the stress reinforcement material is selected from polyethylene terephthalate (PET), polyvinyl chloride (PVC), Polyethylene (PE), Polypropylene (PC), Polystyrene (PS), polyimide (polyimide), nylon (nylon), polyethylene terephthalate (polyethylene terephthalate), polyurethane (polyurethane), acrylic (acrylic), epoxy resin (epoxy), silicone, and combinations thereof.
Wherein, an adhesive layer is also arranged between the stress reinforcement material and at least one of the first outer surface 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 polyurethane (polyurethane), Acrylic (Acrylic), epoxy (epoxy), silicone (silicone), and combinations thereof.
The Young's modulus of the stress reinforcement material is similar to that of the positive electrode current collecting layer and the negative electrode current collecting layer.
Wherein the enclosed area is closed.
The stress reinforcing material is made of a material with a Young modulus close to that of the current collecting layer, the thickness of the stress reinforcing material is smaller than that of the current collecting layer, the stress reinforcing material is arranged on the positive current collecting layer and the negative current collecting layer, so that the surface strength of the current collecting layer is improved, the current collecting layer has certain structural stress, and the unrecoverable deformation is not easy to generate during bending.
Drawings
Fig. 1A to fig. 1C are schematic structural diagrams of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of the present invention.
Description of the reference numerals
10 Flexible battery
12 positive electrode current collecting layer
120 first inner surface
122 first outer surface
14 negative electrode current collecting layer
140 second inner surface
142 second outer surface
16 rubber frame
18 stress reinforcement
20 layer of electrochemical system
202 positive electrode active material layer
204 negative active material layer
206 electrically insulating layer
22 an adhesive layer.
Detailed Description
The purpose, technical content, features and effects of the present invention will be more easily understood through the detailed description of the specific embodiments below.
In order to make the contents of the present invention easier to understand, it should be noted that terms used in the present specification should not be limited to general or dictionary meanings, but interpreted based on meanings and concepts conforming to technical aspects of the present invention on the basis of the principle that the inventors should properly define terms for the best explanation. Based on the above, the words used in the specification are explained below:
"and/or" and "at least one of" includes any and all combinations of one or more of the associated listed items.
"collector layer" means a region for collecting and releasing electrons, and is generally composed of a metal, particularly a metal that does not react with an active material. The current collecting layer in the invention refers to a positive current collecting layer and/or a negative current collecting layer.
"electrochemical system layer" refers to the region of electrochemical reaction. In the present invention, the current collector layer is not included in the electrochemical system layer, and the electron exchange occurs at the interface of the electrochemical system layer and the current collector layer.
The term "electrically insulating layer" refers to an insulating layer for blocking the flow of electrons, that is, an insulating layer for blocking the flow of electrons without affecting the flow of ions, and is usually sandwiched between the positive electrode and the negative electrode, and is used to block the flow of electrons between the positive electrode active material layer and the negative electrode active material layer in the present invention, and is selected from liquid, solid, colloidal and/or combinations thereof.
"enclosed area" means an area that is isolated from the outside environment. In the invention, the enclosing region is formed by enclosing the current collecting layer and the rubber frame, and the electrochemical system layer is arranged in the enclosing region, in other words, the electrochemical system layer is isolated from the outside through the enclosing of the current collecting layer and the rubber frame.
6. The position, size, range, and the like of each constituent element shown in the drawings of the present invention do not necessarily indicate the actual position, size, range, and the like. The invention is not limited to what is disclosed in the drawings.
The invention aims to provide a flexible battery, wherein a stress reinforcing material is arranged on a current collecting layer, and the stress reinforcing material at least needs to have the following conditions:
a. the stress reinforcement material needs to have certain structural strength to provide structural stress of the current collecting layer and avoid unrecoverable deformation of the flexible battery after bending.
b. In order to maintain the flexible property of the flexible battery, the stress reinforcement material should have a certain flexibility.
Next, the following is a more detailed description according to the spirit of the present invention:
fig. 1A to fig. 1C are schematic structural diagrams of a flexible battery according to an embodiment of the present disclosure. The flexible battery 10 includes a positive current collecting layer 12, a negative current collecting layer 14, a rubber frame 16, a stress reinforcement 18, and an electrochemical system layer 20, wherein the stress reinforcement 18 is disposed on a first outer surface 122 of the positive current collecting layer 12 as shown in fig. 1A, or the stress reinforcement 18 is disposed on a second outer surface 142 of the negative current collecting layer 14 as shown in fig. 1B, or the stress reinforcement 18 is disposed on the first outer surface 122 of the positive current collecting layer 12 and the second outer surface 142 of the negative current collecting layer 14 as shown in fig. 1C. Referring to fig. 1C, the positive current collecting layer 12, the negative current collecting layer 14 and the frame 16 form an enclosed region, and an electrochemical system layer 20 is disposed in the enclosed region. The electrochemical system layer 20 includes a positive active material layer 202, a negative active material layer 204, and an electrical insulating layer 206, wherein the positive active material layer 202 is adjacent to the first inner surface 120 of the positive current collecting layer 12, the negative active material layer 204 is adjacent to the second inner surface 140 of the negative current collecting layer 14, and the electrical insulating layer 206 is sandwiched between the positive active material layer 202 and the negative active material layer 204.
The reason why the Young's modulus (Young's modulus) of the stress reinforcement material is close to that of the current collecting layer and the thickness of the stress reinforcement material and the current collecting layer is within a certain range is that if the Young modulus of the stress reinforcement material is too different from that of the current collecting layer and the thickness of the stress reinforcement material is too different from that of the current collecting layer, the problem of different curvatures may occur when the stress is applied. Therefore, the stress reinforcement material is selected from materials with the Young modulus similar to that of the current collecting layer, and the thickness ratio of the stress reinforcement material to the current collecting layer is between 0.25 and 6.
For example, if stainless steel is selected as the material for the positive collector layer, the thickness of the positive collector layer may be between 5 μm and 15 μm, if aluminum is selected as the material, the thickness of the positive collector layer may be between 25 μm and 40 μm, and if stainless steel is selected as the material for the negative collector layer, the thickness of the negative collector layer may be between 5 μm and 15 μm, and if copper is selected as the material, the thickness of the negative collector layer may be between 2 μm and 20 μm. For the stress reinforcement material, the thickness is preferably not more than 30 μm, otherwise the excessively thick stress reinforcement material is difficult to bend due to the thickness thereof, but for the excessively thin stress reinforcement material, for example, less than 10 μm, it is difficult to provide the purpose of reinforcing the structural strength, for the stress reinforcement material, the thickness is preferably between 10 μm and 12 μm, which can exert a preferable effect, and for the material of the stress reinforcement material, common and selectable materials such as, but not limited to, polyethylene terephthalate (PET), polyvinyl chloride (PVC), Polyethylene (PE), Polypropylene (PC), Polystyrene (PS), polyimide (polyimide), nylon (nylon), polyethylene terephthalate (ethylene terephthalate), polyurethane (polyurethane), acrylic (acrylic), epoxy resin (epoxy), silicone (silicone), and the like, but the practical application is not limited to the above-mentioned kinds of materials.
In addition, the thickness of the current collecting layer is not greater than that of the active material layer, because the active material layer is coated on the inner side of the current collecting layer, and because the active material layer is made of a material of the active material layer, the bending ductility of the active material layer is quite low, and if the thickness of the active material layer is too thick, the active material layer is easy to crack, so that the active material layer pierces the current collecting layer, or the current collecting layer is broken due to the fact that the active material layer is excessively pulled by the current collecting layer.
In addition, the stress reinforcement material is disposed on the current collecting layer by coating (painting), spraying (spraying), printing (printing), or the like, or an adhesion layer may be added between the stress reinforcement material and the current collecting layer to adhere the stress reinforcement material and the current collecting layer.
Please refer to fig. 2, which is a schematic structural diagram of a flexible battery with an adhesive layer, and the difference between the flexible battery 10 and fig. 1A to 1C is that the flexible battery has an adhesive layer 22, the adhesive layer 22 is sandwiched between the first outer surface 122 and the stress reinforcement material 18 and/or between the second outer surface 142 and the stress reinforcement material 18, in other words, the adhesive layer 22 is disposed between the positive current collecting layer 12 and the stress reinforcement material 18, or between the negative current collecting layer 14 and the stress reinforcement material 18, fig. 2 shows only the case where the adhesive layer 22 and the stress reinforcement material 18 are disposed on both the first outer surface 122 of the positive current collecting layer 12 and the second outer surface 142 of the negative current collecting layer 14, of course, when the adhesive layer 22 may only exist between the positive current collecting layer 12 and at least one of the stress reinforcement material 18, the case may depend on the location where the stress reinforcement material 18 is disposed, for example, when the stress reinforcement member 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 reinforcement member 18.
The adhesive layer is made of adhesive glue, which may be made of polyurethane (polyurethane), Acrylic (Acrylic), epoxy resin (epoxy), silicone (silicone), etc., and has a thickness of not more than 5 μm.
The vocabulary to explain point 5 states that the electrochemical system layer is isolated from the outside by the enclosure of the current collecting layer and the rubber frame, so that the enclosed area is closed and is not in contact with the outside environment. That is, the plastic frame needs to have the function of resisting moisture and flexibility, so the material of the plastic frame of the present invention is selected from silica gel (silicone), which can resist moisture and still has flexibility after aging. In addition, the rubber frame at least partially overlaps the positive current collecting layer and the negative current collecting layer in the orthogonal projection direction, that is, the rubber frame does not need to completely overlap the positive current collecting layer and the negative current collecting layer in the orthogonal projection direction.
Flexible batteries in the market use aluminum-plastic films as the packaging materials of the batteries to contain positive electrodes (cathodes), negative electrodes (anodes), separators (separators), and electrolytes (electrolytes). Different from the present invention, the present invention uses the current collecting layer and the rubber frame as the package, that is, the current collecting layer not only collects and releases electrons, but also isolates the electrochemical system layer from the outside together with the rubber frame, and the flexible battery in the inverse market isolates the current collecting layer and the electrochemical system layer from the outside by the aluminum plastic film. Thus, the present invention is distinct from flexible battery structures that typically use aluminum plastic films.
In summary, the stress reinforcement is disposed on the current collecting layer to enhance the surface strength of the current collecting layer, and when the current collecting layer has a certain structural stress, the current collecting layer is not easily buckled or bent to form an acute angle or an unrecoverable deformation, so that even if the flexible battery is repeatedly bent, the battery can maintain a good capacity and a long service life.
However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all the equivalent changes and modifications of the claims of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. 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 sandwiched between the first inner surface and the second inner surface to form an enclosed region, wherein the positive current collecting layer, the negative current collecting layer and the plastic frame are packaging materials of the flexible battery; and
an electrochemical system layer arranged in the enclosed area and adjacent to the side surface of the rubber frame;
wherein, at least one of the first outer surface and the second outer surface is provided with a stress reinforcing material, and the Young modulus of the stress reinforcing material is similar to that of the material of the current collecting layer; the current collecting layer comprises the positive current collecting layer and/or the negative current collecting layer; the thickness ratio of the stress reinforcing material to the positive electrode current collecting layer or the negative electrode current collecting layer is between 0.25 and 6; the material of the rubber frame and the stress reinforcement material is silica gel.
2. A flexible battery according to claim 1, wherein said electrochemical system layer includes a positive active material layer, a negative active material layer and an electrically insulating layer sandwiched between said positive active material layer and said negative active material layer, said positive active material layer being adjacent to said first inner surface and said negative active material layer being adjacent to said second inner surface.
3. A flexible battery according to claim 1, wherein said positive current collector layer has a thickness in the range of 5 μm to 40 μm.
4. A flexible battery according to claim 1, wherein said negative current collector layer has a thickness in the range of 2 μm to 20 μm.
5. A flexible battery according to claim 1, wherein said stress reinforcement has a thickness of 10 μm to 30 μm.
6. The flexible battery of claim 1, further comprising an adhesive layer between the stress reinforcement and at least one of the first outer surface, the stress reinforcement, and the second outer surface.
7. A flexible battery according to claim 6, wherein said adhesive layer has a thickness of not more than 5 μm.
8. The flexible battery of claim 6, wherein the adhesive layer is selected from the group consisting of polyurethane, acrylic, epoxy, silicone, and combinations thereof.
9. The flexible battery of claim 1, wherein the enclosed region is hermetically sealed.
CN201710908079.1A 2017-09-29 2017-09-29 Flexible battery Active CN109585897B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201710908079.1A CN109585897B (en) 2017-09-29 2017-09-29 Flexible battery
DE212018000257.6U DE212018000257U1 (en) 2017-09-29 2018-08-16 Flexible battery
PCT/CN2018/100846 WO2019062373A1 (en) 2017-09-29 2018-08-16 Flexible battery
JP2020600024U JP3229241U (en) 2017-09-29 2018-08-16 Flexible battery

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CN109585897B true CN109585897B (en) 2022-05-31

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WO (1) WO2019062373A1 (en)

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WO2022193088A1 (en) * 2021-03-15 2022-09-22 宁德新能源科技有限公司 Battery and device comprising same

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CN109585897A (en) 2019-04-05
JP3229241U (en) 2020-12-03
DE212018000257U1 (en) 2020-02-21
WO2019062373A1 (en) 2019-04-04

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