CN110571472B - Electrode core body of flexible battery and preparation method and application thereof - Google Patents
Electrode core body of flexible battery and preparation method and application thereof Download PDFInfo
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- CN110571472B CN110571472B CN201910774192.4A CN201910774192A CN110571472B CN 110571472 B CN110571472 B CN 110571472B CN 201910774192 A CN201910774192 A CN 201910774192A CN 110571472 B CN110571472 B CN 110571472B
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses an electrode core body of a flexible battery and a preparation method and application thereof, and is characterized in that the electrode core body comprises a positive plate, a negative plate and a diaphragm, wherein the positive plate comprises a positive current collecting plate and a plurality of positive material areas coated on the positive current collecting plate in a spaced stripe mode; the negative plate is of a bent structure formed by sequentially connecting a plurality of V-shaped structural sections; the positive electrode material area and the negative electrode material area are in pairwise opposite matching, and the positive electrode plate and the negative electrode plate are separated by the diaphragm. The invention has the advantages that the battery bending effect is achieved through the sliding between the electrode plate layers and the bending of the electrode plate, and the bending service life and the capacity of the battery are greatly increased.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a flexible battery and a preparation method and application thereof.
Background
With the gradual development of consumer electronics products such as mobile phones and wearable devices towards flexibility, the market demand for flexible batteries is gradually increasing. Compared with a rigid battery, the flexible battery can enable electronic products to be more attractive and more accordant with the human body structure, so that the flexible battery has wide market demands.
When products such as traditional lithium ion batteries are bent and folded, due to the problem of material adhesion, after being bent for many times, the electrode material is easy to fall off, even the current collector is easy to break, the electrochemical performance of the battery is influenced, and even serious safety problems are possibly caused. At present, most of flexible batteries are flexible batteries which are improved by reducing the thickness of the batteries, but the method not only causes the universal low capacity of the batteries, but also limits the application range of the flexible batteries.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide an electrode core body of a flexible battery, and a preparation method and application thereof.
In order to achieve the above object, a first aspect of the present invention provides an electrode core of a flexible battery, which comprises a positive electrode sheet, a negative electrode sheet and a separator,
the positive plate comprises a positive current collecting plate and a plurality of positive material areas coated on the positive current collecting plate in a spaced stripe mode, the positive current collecting plate corresponds to the spaced areas between the adjacent positive material areas to form a positive empty foil area,
the negative plate comprises a negative current collector and a plurality of negative material areas coated on the negative current collector in the form of spaced stripes, the negative current collector corresponds to the spaced areas between adjacent negative material areas to form a negative empty foil area,
the positive plate is bent by taking any position of the positive empty foil area as a bending position to form a bending structure formed by sequentially connecting a plurality of V-shaped structural sections;
the negative plate is bent by taking any position of a negative empty foil area as a bending position to form a bending structure formed by sequentially connecting a plurality of V-shaped structural sections;
the positive plate and the negative plate are arranged in a manner that the surfaces of the positive plate and the negative plate, which are provided with the positive material area and the negative material area under the bending state, are opposite to each other, the positive material area and the negative material area are in pairwise opposite matching, and the positive plate and the negative plate are separated by the diaphragm.
The further setting is positive pole material district on the positive plate all set up on two faces of positive current collector piece, the negative pole material district of negative plate set up on one of them face, and the quantity of negative plate is 2 times of positive plate, positive plate with the structure form of buckling set up in the centre, the negative plate with the structure form of buckling set up respectively in the corresponding both sides of positive plate, separate through the diaphragm between negative plate and the positive plate.
The further setting is negative pole material district on the negative pole piece all set up on two faces of negative pole current collector piece, the positive pole material district of positive pole piece set up on one of them face, and the quantity of positive pole piece is 2 times of negative pole piece, the negative pole piece with the structure form of buckling set up in the centre, the positive pole piece with the structure form of buckling set up respectively in the corresponding both sides of negative pole piece, separate through the diaphragm between negative pole piece and the positive pole piece.
The positive electrode material areas are rectangular with the same size and specification, and the positive electrode empty foil areas are also rectangular with the same size and specification;
the negative electrode material areas are rectangular in the same size specification, and the negative electrode empty foil areas are also rectangular in the same size specification.
A preparation method of an electrode core body of a flexible battery comprises the following steps:
(1) Manufacturing a positive plate and a negative plate: respectively coating the positive electrode slurry and the negative electrode slurry on a current collecting sheet in a spaced stripe mode to form a positive electrode sheet and a negative electrode sheet respectively, wherein a coating area on the positive electrode sheet forms a positive electrode material area, an interval area between the positive electrode material areas forms a positive electrode empty foil area, a coating area on the negative electrode sheet forms a negative electrode material area, and an interval area between the negative electrode material areas forms a negative electrode empty foil area;
(2) Processing into a positive plate and a negative plate of a bending structure: bending the positive plate by taking any position of the positive empty foil area as a bending position to form a bending structure formed by sequentially connecting a plurality of V-shaped structural sections;
bending the negative plate by taking any position of the negative empty foil area as a bending position to form a bending structure formed by sequentially connecting a plurality of V-shaped structural sections;
(3) The electrode core body is manufactured, one surface of the positive plate and one surface of the negative plate, which are provided with the positive material area and the negative material area, are arranged oppositely under the bending form of the positive plate and the negative plate, the positive material area and the negative material area are in pairwise opposite matching, and the positive plate and the negative plate are separated by the diaphragm.
The invention also provides a flexible battery with the electrode core body, which comprises a flexible packaging body, the electrode core body and electrolyte arranged in the packaging body, and a positive terminal and a negative terminal which are respectively electrically connected with the electrode core body and led out of the packaging body.
According to the invention, the pole piece is obliquely arranged in the battery at a certain angle, and the battery bending effect is achieved through the sliding between the pole piece layers and the bending of the pole piece in the battery bending process, so that the bending life of the battery is greatly prolonged.
The invention has the advantages that:
1. generally, the flexible battery pole piece is paved inside the battery, the bending effect of the battery is achieved directly by bending the electrode piece, but the electrode piece is easy to fall off powder and break in the bending process. According to the invention, the electrode core body is obliquely arranged in the battery at a certain angle, and the battery bending effect is achieved through the sliding between the electrode plate layers and the bending of the electrode plate in the battery bending process, so that the bending life of the battery is greatly prolonged.
2. The thickness of the flexible battery can be far beyond that of a common flexible battery, and the flexible battery is better than the common flexible battery in the use range.
3. The battery achieves the effect of bending the winding core through the sliding between the electrode plate layers and the bending of the electrode plate. Therefore, the deterioration of the performance and the life of the electrode sheet due to bending is reduced.
In order to limit the thickness of the flexible battery, the invention adopts the flexible battery structure, thereby releasing the limit of the thickness to the battery, improving the bending-resistant service life of the battery and reducing the influence of the bending on the battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive labor.
FIG. 1 is a schematic view of coating of positive and negative electrode sheets in example 1 of the present invention;
fig. 2 is a structural layout view of an electrode core of embodiment 1 of the present invention;
FIG. 3 is a schematic view of the present invention in application to a flexible battery;
FIG. 4 is a diagram of the present invention in a stressed state as applied to a flexible battery;
FIG. 5 is a force exploded view of the present invention applied to a flexible battery;
fig. 6 is a structural layout view of an electrode core of embodiment 2 of the present invention;
FIG. 7 is a graph showing the first charge and discharge of the battery according to example 2 of the present invention;
fig. 8 is a charge-discharge curve diagram of the battery of example 2 of the present invention after being bent 10000 times.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1 to 5, in embodiment 1 of the present invention, the electrode core includes a positive electrode sheet 1, a negative electrode sheet 2, and a separator 3, where the positive electrode sheet 1 includes a positive electrode current collecting sheet 11 and a plurality of positive electrode material regions 12 coated on the positive electrode current collecting sheet 11 in the form of spaced stripes, and a positive electrode empty foil region 13 is formed by a spaced region between adjacent positive electrode material regions corresponding to the positive electrode current collecting sheet; the negative plate 2 comprises a negative current collecting plate 21 and a plurality of negative material areas 22 coated on the negative current collecting plate 21 in a spaced stripe mode, and the negative current collecting plate corresponds to spaced areas between adjacent negative material areas to form a negative empty foil area 23; the positive electrode slurry used in the positive electrode material region 12 and the negative electrode slurry used in the negative electrode material region 22 in this embodiment are both conventional lithium battery positive electrode slurry or negative electrode slurry, which are conventional technologies in the art, and details of this embodiment are not repeated.
The positive plate 1 described in this embodiment 1 is bent with the center of the positive empty foil area 13 as a bent portion to form a bent structure formed by sequentially connecting a plurality of V-shaped structural sections; the negative plate 2 is bent by taking the center of the negative empty foil area 23 as a bending part to form a bending structure formed by sequentially connecting a plurality of V-shaped structural sections; the positive plate 1 and the negative plate 2 are provided with a positive material area 12 and a negative material area 22 under the bending state, the positive material area 12 and the negative material area 22 are arranged oppositely, pairwise and rightly matched, and the positive plate and the negative plate are separated by the diaphragm 3.
In this embodiment, the plurality of positive electrode material regions 12 are rectangular in shape with the same dimension, and the plurality of positive electrode empty foil regions 13 are also rectangular in shape with the same dimension; the plurality of negative electrode material areas 22 are rectangular in shape with the same dimension, and the plurality of negative electrode empty foil areas 23 are also rectangular in shape with the same dimension.
The electrode core body of the flexible battery is prepared by the following method, and the method comprises the following steps:
(1) Manufacturing a positive plate 1 and a negative plate 2: respectively coating the positive electrode slurry and the negative electrode slurry on a current collecting sheet in a spaced stripe mode to form a positive electrode sheet and a negative electrode sheet respectively, wherein a coating area on the positive electrode sheet 1 forms a positive electrode material area 12, an interval area between the positive electrode material areas 12 forms a positive electrode empty foil area 13, a coating area on the negative electrode sheet 2 forms a negative electrode material area 22, and an interval area between the negative electrode material areas 22 forms a negative electrode empty foil area 23;
(2) Processing into a positive plate and a negative plate of a bending structure: bending the positive plate by taking any position of the positive empty foil area as a bending position to form a bending structure formed by sequentially connecting a plurality of V-shaped structural sections; bending the negative plate by taking any position of the negative empty foil area as a bending position to form a bending structure formed by sequentially connecting a plurality of V-shaped structural sections;
(3) The electrode core body is manufactured, one surface of the positive plate and one surface of the negative plate, which are provided with the positive material area and the negative material area, are arranged oppositely under the bending form of the positive plate and the negative plate, the positive material area and the negative material area are in pairwise opposite matching, and the positive plate and the negative plate are separated by the diaphragm.
In addition, as shown in fig. 3, the flexible battery comprises a flexible packaging body 4, the electrode core body and the electrolyte arranged in the packaging body, and a positive terminal and a negative terminal which are respectively electrically connected with the electrode core body and led out of the packaging body, wherein the electrode core body is arranged in the packaging body at an inclination angle of 0 degrees < a < 180 degrees. The overall thickness of the flexible battery can be determined by the bevel angle a and the length of 1/2V-shape.
When the flexible battery is stressed and bent, the stress of the pole piece is shown in figure 4. As shown in fig. 5, the single-layer pole piece is subjected to stress decomposition, and F can be decomposed into a force F1 for sliding between the pole piece layers and a force F2 for bending the pole piece. Under the action of the forces F1 and F2, the bending action of the whole electrode core is completed through the sliding between the pole piece layers and the bending of the pole piece layers. The sliding between the pole piece layers and the bending degree of the pole piece layers are influenced by factors such as an angle a, the number of layers of the whole electrode core pole piece, the difficulty degree of sliding between the layers, a packaging body and the like.
Example 2
The present embodiment 2 differs from embodiment 1 in that: taking the positive electrode material area coated on the two sides of the positive electrode plate as an example:
anodal piece 1 on anodal material district 12 all set up on two faces of anodal current collector piece 11, negative pole piece 2's negative pole material district 22 set up on one of them face, and the quantity of negative pole piece 2 and diaphragm is 2 times positive pole piece 1, positive pole piece 1 with the structure form of buckling set up in the centre, negative pole piece 2 with the structure form of buckling set up respectively in the both sides that correspond of positive pole piece, separate through diaphragm 3 between negative pole piece 2 and the positive pole piece 1.
In fig. 6, the battery is manufactured according to the above structure, and the design scheme is as follows:
the positive electrode material: ternary, PVDF and SP, and the mass ratio is 94:3:3;
and (3) anode material: graphite, CMC, SBR and SP, wherein the mass ratio is 96:1.7:1.3:1;
the other materials adopt traditional aluminum-plastic films, diaphragms and the like, the design size of the battery core is 8mm in thickness, 35mm in width and 35mm in length, and the winding core stands in the outer package at 90 degrees (namely a =90 degrees).
The initial capacity of the test cell was 629mAh as shown in fig. 7. In this embodiment, the battery is limited by the material of the package body and the design of the battery, and the battery can be bent to a radian of 160 °, and after the battery is bent 10000 times, the charging and discharging performance of the battery is tested, as shown in fig. 8, and the battery capacity is 628mAh. The method shows that in the embodiment, the internal part of the battery does not have the bad phenomena of fracture, powder falling and the like in the bending process.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (6)
1. The utility model provides an electrode core of flexible battery, this electrode core includes positive plate, negative pole piece and diaphragm, its characterized in that:
the positive plate comprises a positive current collecting plate and a plurality of positive material areas coated on the positive current collecting plate in a spaced stripe mode, the positive current collecting plate corresponds to the spaced areas between the adjacent positive material areas to form a positive empty foil area,
the negative plate comprises a negative current collector and a plurality of negative material areas coated on the negative current collector in the form of spaced stripes, the negative current collector corresponds to the spaced areas between adjacent negative material areas to form a negative empty foil area,
the positive plate is bent by taking any position of the positive empty foil area as a bending position to form a bending structure formed by sequentially connecting a plurality of V-shaped structural sections;
the negative plate is bent by taking any position of a negative empty foil area as a bending position to form a bending structure formed by sequentially connecting a plurality of V-shaped structural sections;
the positive plate and the negative plate are provided with a positive material area and a negative material area under the bending state, one surfaces of the positive plate and the negative plate are arranged oppositely, the positive material area and the negative material area are matched with each other in a pairwise opposite mode, and the positive plate and the negative plate are separated by the diaphragm;
the plurality of positive electrode material areas are rectangular with the same dimension and specification, and the plurality of positive electrode empty foil areas are also rectangular with the same dimension and specification;
the negative electrode material areas are rectangular with the same size and specification, and the negative electrode empty foil areas are also rectangular with the same size and specification;
the electrode core body is obliquely arranged inside the battery, and the battery bending effect is achieved through sliding among the pole piece layers and bending of the pole pieces.
2. The electrode core of a flexible battery as defined in claim 1, wherein: the positive plate on the positive electrode material district all set up on two faces of positive current collector piece, the negative pole material district of negative pole piece set up on one of them face, and the quantity of negative pole piece is 2 times of positive pole piece, positive pole piece with the structure form of buckling set up in the centre, the negative pole piece with the structure form of buckling set up respectively in the both sides that correspond of positive pole piece, separate through the diaphragm between negative pole piece and the positive pole piece.
3. The electrode core of a flexible battery as defined in claim 1, wherein: the negative pole piece on negative pole material district all set up on two faces of negative pole current collector piece, the positive pole material district of positive pole piece set up on one of them face, and the quantity of positive pole piece is 2 times of negative pole piece, the negative pole piece with the structure form of buckling set up in the centre, the positive pole piece with the structure form of buckling set up respectively in the both sides that correspond of negative pole piece, separate through the diaphragm between negative pole piece and the positive pole piece.
4. A preparation method of an electrode core body of a flexible battery is characterized by comprising the following steps:
(1) Manufacturing a positive plate and a negative plate: respectively coating the positive electrode slurry and the negative electrode slurry on a current collecting sheet in a spaced stripe mode to form a positive electrode sheet and a negative electrode sheet respectively, wherein a coating area on the positive electrode sheet forms a positive electrode material area, an interval area between the positive electrode material areas forms a positive electrode empty foil area, a coating area on the negative electrode sheet forms a negative electrode material area, and an interval area between the negative electrode material areas forms a negative electrode empty foil area;
(2) Processing into a positive plate and a negative plate of a bending structure: bending the positive plate by taking any position of the positive empty foil area as a bending position to form a bending structure formed by sequentially connecting a plurality of V-shaped structural sections;
bending the negative plate by taking any position of the negative empty foil area as a bending position to form a bending structure formed by sequentially connecting a plurality of V-shaped structural sections;
(3) The electrode core body is manufactured, one surface of the positive plate and one surface of the negative plate, which are provided with the positive material area and the negative material area, are arranged oppositely under the bending form of the positive plate and the negative plate, the positive material area and the negative material area are in pairwise opposite matching, and the positive plate and the negative plate are separated by the diaphragm.
5. A flexible battery having an electrode core according to any one of claims 1 to 3, wherein: the flexible battery comprises a flexible packaging body, the electrode core body and electrolyte arranged in the packaging body, and a positive terminal and a negative terminal which are respectively electrically connected with the electrode core body and led out of the packaging body.
6. The electrode core flexible battery of claim 5, wherein: the electrode core is arranged in the packaging body at an inclination angle of 0 degrees < a < 180 degrees.
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| CN111129577B (en) * | 2019-12-27 | 2023-08-29 | Oppo广东移动通信有限公司 | Flexible battery cell and electronic equipment |
| CN113707836B (en) * | 2020-05-22 | 2023-09-01 | 松山湖材料实验室 | Flexible battery, zebra-shaped electrode thereof and manufacturing method |
| CN113410524B (en) * | 2021-05-31 | 2023-06-16 | 惠州市恒泰科技股份有限公司 | Arc lamination lithium battery and lamination method thereof |
| CN113394373A (en) * | 2021-06-29 | 2021-09-14 | 深圳市德方纳米科技股份有限公司 | Battery core, preparation method thereof and battery |
| CN113823825A (en) * | 2021-08-29 | 2021-12-21 | 西北工业大学 | Battery cell, manufacturing method thereof, arc-shaped battery and battery module |
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| CN101656330A (en) * | 2009-09-22 | 2010-02-24 | 南京双登科技发展研究院有限公司 | Method for manufacturing lithium ion battery cell |
| CN102683752B (en) * | 2012-04-09 | 2014-08-27 | 久兆新能源科技有限公司 | Stacked lithium ion power battery and manufacturing method thereof |
| CN103928715A (en) * | 2014-04-25 | 2014-07-16 | 广西师范大学 | Battery cell of flexible laminated lithium ion battery, manufacturing method of battery cell as well as battery |
| CN106025374A (en) * | 2016-05-29 | 2016-10-12 | 合肥国轩高科动力能源有限公司 | Method for producing laminated battery |
| CN107240671A (en) * | 2017-04-07 | 2017-10-10 | 深圳市优特利电源有限公司 | Flexible electrode and flexible battery core |
| CN109713376A (en) * | 2019-02-15 | 2019-05-03 | 柔电（武汉）科技有限公司 | Flexible battery and preparation method thereof |
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