CN110767867A - Ultrathin battery and preparation method thereof - Google Patents
Ultrathin battery and preparation method thereof Download PDFInfo
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- CN110767867A CN110767867A CN201910966415.7A CN201910966415A CN110767867A CN 110767867 A CN110767867 A CN 110767867A CN 201910966415 A CN201910966415 A CN 201910966415A CN 110767867 A CN110767867 A CN 110767867A
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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
-
- 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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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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
-
- 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
- H01M50/531—Electrode connections inside a battery casing
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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
-
- 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
Abstract
The invention belongs to the technical field of battery manufacturing, and particularly relates to an ultrathin battery which comprises a positive plate, a negative plate, a diaphragm, electrolyte and a sealing rubber ring, wherein the diaphragm is clamped between the positive plate and the negative plate, a positive active material layer is arranged on one surface, which is attached to the diaphragm, of the positive plate, a negative active material layer is arranged on one surface, which is attached to the diaphragm, of the negative plate, the electrolyte is soaked in the positive active material layer and/or the negative active material layer, and the sealing rubber ring is arranged between the positive plate and the negative plate in a sealing manner. Compared with the prior art, the ultrathin battery provided by the invention is smaller in thickness and can be used for ultrathin miniature electronic equipment. In addition, the invention also provides a preparation method of the ultrathin battery, which is simple to operate and low in cost.
Description
Technical Field
The invention belongs to the technical field of battery manufacturing, and particularly relates to an ultrathin battery and a preparation method thereof.
Background
With the development of society, the development of electronic products is more miniaturized, and the required battery is smaller and thinner. For example, the batteries used on smart cards are very thin. Therefore, there is an increasing demand for ultra-thin lithium ion batteries, which are manufactured by conventional processes to have a thickness of millimeter or more. Limiting its application to ultra-thin, ultra-miniature electronic devices.
The traditional lithium ion battery core is usually manufactured by winding or laminating a positive electrode, a diaphragm and a negative electrode, wherein the positive and negative surfaces of the positive and negative electrode plates are coated with active substances and welded with lugs, and finally, a layer of thick aluminum-plastic film is packaged on the outer layer. Therefore, the thickness of the battery core is larger, the thickness of the battery core is difficult to reach the thickness lower than the micron level, and the battery core cannot be used on ultra-thin electronic equipment.
Therefore, it is very necessary to design an ultra-thin battery to meet the demand of ultra-thin micro electronic devices.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects of the prior art, the ultra-thin battery is provided, has small thickness and can be used for ultra-thin miniature electronic equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an ultrathin battery, includes positive plate, negative pole piece, diaphragm, electrolyte and sealed rubber ring, the diaphragm presss from both sides and locates positive plate with between the negative pole piece, positive plate with the one side of diaphragm laminating is provided with anodal active material layer, the negative pole piece with the one side of diaphragm laminating is provided with negative active material layer, electrolyte soak in anodal active material layer and/or negative active material layer, sealed rubber ring seal set up in positive plate with between the negative pole piece.
As a preferable embodiment of the ultra-thin battery of the present invention, the ultra-thin battery further includes an insulating layer, and the insulating layer is disposed on an exposed surface of the positive electrode tab and an exposed surface of the negative electrode tab.
In a preferred embodiment of the ultra-thin battery according to the present invention, a positive tab extends from an end of the positive plate, and a negative tab extends from an end of the negative plate.
As a preferable aspect of the ultra-thin battery of the present invention, the length of the sealing rubber ring is greater than the length of the separator, and the width of the sealing rubber ring is greater than the width of the separator; the length of the sealing rubber ring is smaller than the length of the positive plate and the length of the negative plate, and the width of the sealing rubber ring is smaller than the width of the positive plate and the width of the negative plate.
As a preferred scheme of the ultrathin battery, the positive plate is an aluminum foil, and the thickness of the aluminum foil is 8-100 mu m; the negative plate is a copper foil, and the thickness of the copper foil is 5-100 mu m.
As a preferable embodiment of the ultra-thin battery of the present invention, the positive electrode active material layer includes a positive electrode material, a positive electrode binder, and a positive electrode conductive agent, the positive electrode material is at least one of lithium cobaltate, lithium manganate, lithium nickel cobalt aluminate, lithium iron phosphate, and lithium iron manganese phosphate, the positive electrode binder is polyvinylidene fluoride, and the positive electrode conductive agent is conductive carbon black and/or carbon nanotubes.
As a preferable embodiment of the ultrathin battery of the present invention, the negative electrode active material layer includes a negative electrode material, a negative electrode binder, and a negative electrode conductive agent, the negative electrode material is at least one of graphite, a silicon-oxygen compound, a silicon-carbon compound, and lithium titanate, the negative electrode binder is sodium carboxymethylcellulose and styrene-butadiene rubber, and the negative electrode conductive agent is conductive carbon black and/or carbon nanotubes.
In a preferable embodiment of the ultra-thin battery of the present invention, the separator is made of at least one of PE, PP, PVDF, and PET ceramics, and the thickness of the separator is 5 to 30 μm.
Another object of the invention is: the preparation method of the ultrathin battery comprises the following steps:
s1, coating a positive electrode active material layer on one surface of the positive electrode plate, coating a negative electrode active material layer on one surface of the negative electrode plate, and then baking and rolling;
s2, cutting the positive electrode sheet and the negative electrode sheet obtained in the step S1 into required shapes and sizes;
s3, attaching a sealing rubber ring to the edge of the positive electrode active material layer;
s4, impregnating the positive electrode active material layer and/or the negative electrode active material layer with an electrolyte;
and S5, arranging the positive electrode active material layer and the negative electrode active material layer in a facing manner, sandwiching a diaphragm between the positive electrode active material layer and the negative electrode active material layer, and performing heat sealing to obtain the ultrathin battery.
In a preferable scheme of the preparation method of the ultrathin battery, in step S1, the baking temperature is 50-150 ℃, the baking time is 5-60 min, and the rolling pressure is 8-150T. The electrode sheet is firstly baked to ensure that the subsequently dripped electrolyte can be more quickly and fully soaked into the active material layer. The rolling pressure is adjusted accordingly according to the compacted density.
Compared with the prior art, the invention has the beneficial effects that:
1) the positive plate and the negative plate are coated on single surfaces, and the battery is sealed without an aluminum-plastic packaging film, so that the thickness of the battery is reduced, and the process flow is simplified.
2) According to the invention, the positive plate and the negative plate are extended to form the positive pole lug and the negative pole lug as the positive pole lug and the negative pole lug directly through cutting, and the pole pieces and the lugs are a continuous whole without welding, so that the thickness of the battery is reduced, the material is reduced, and the cost is reduced.
3) The ultrathin lithium ion battery prepared by the invention only needs to arrange the positive plate and the negative plate oppositely and clamp the diaphragm between the positive plate and the negative plate for heat sealing, and the process is simple.
Drawings
Fig. 1 is a schematic view of the structure of an ultra-thin battery in the present invention.
Fig. 2 is a sectional view of an ultra-thin battery in the present invention.
Fig. 3 is a schematic view of the structure of the positive electrode sheet in the present invention.
Fig. 4 is a schematic view of the structure of the negative electrode sheet according to the present invention.
Wherein: 1-positive plate, 2-negative plate, 3-diaphragm, 4-sealing rubber ring, 5-positive active material layer, 6-negative active material layer, 7-insulating layer, 8-positive pole tab and 9-negative pole tab.
Detailed Description
As shown in fig. 1 to 4, an ultrathin battery includes a positive plate 1, a negative plate 2, a diaphragm 3, an electrolyte and a sealing rubber ring 4, wherein the diaphragm 3 is clamped between the positive plate 1 and the negative plate 2, a positive active material layer 5 is disposed on one surface of the positive plate 1, which is attached to the diaphragm 3, a negative active material layer 6 is disposed on one surface of the negative plate 2, which is attached to the diaphragm 3, the electrolyte is soaked in the positive active material layer 5 and/or the negative active material layer 6, and the sealing rubber ring 4 is hermetically disposed between the positive plate 1 and the negative plate 2. The sealing rubber ring 4 comprises but is not limited to a PE rubber ring and a PP rubber ring, the sealing rubber ring 4 mainly plays a sealing role, compared with the method that an adhesive layer is directly coated on the pole piece, the operation process is simpler, and the influence on an active material layer on the pole piece is smaller. The electrolyte is sufficiently impregnated into the positive electrode active material layer 5 and/or the negative electrode active material layer 6 by dropping or injecting, and generates free ions with the positive electrode material and/or the negative electrode material therein.
Further, the lithium ion battery further comprises an insulating layer 7, wherein the insulating layer 7 is arranged on the exposed surface of the positive plate 1 and the exposed surface of the negative plate 2. The insulating layer 7 can enhance the insulation and reliability of the battery.
Further, a positive electrode tab 8 extends from an end of the positive electrode sheet 1, and a negative electrode tab 9 extends from an end of the negative electrode sheet 2. The tab is obtained by extending the pole piece, and the tab and the pole piece are a continuous whole, so that the tab is not required to be welded, the production material is saved, and the thickness of the battery can be greatly reduced.
Further, the length of the sealing rubber ring 4 is greater than that of the diaphragm 3, and the width of the sealing rubber ring 4 is greater than that of the diaphragm 3; the length of the sealing rubber ring 4 is smaller than the length of the positive plate 1 and the length of the negative plate 2, and the width of the sealing rubber ring 4 is smaller than the width of the positive plate 1 and the width of the negative plate 2. The length of the separator 3 is longer than the length of the positive electrode active material layer 5 and the length of the negative electrode active material layer 6, and the width of the separator 3 is wider than the width of the positive electrode active material layer 5 and the width of the negative electrode active material layer 6, so that the positive electrode active material layer 5 and the negative electrode active material layer 6 are not in direct contact. The reason why the size of the sealing ring is larger than the size of the diaphragm 3 and smaller than the size of the positive electrode plate 1 and the size of the negative electrode plate 2 is to ensure that the positive electrode plate 1, the diaphragm 3 and the negative electrode plate 2 can be attached and sealed.
Further, the positive plate 1 is an aluminum foil, and the thickness of the aluminum foil is 8-100 μm, preferably 20-40 μm; the negative electrode sheet 2 is a copper foil, and the thickness of the copper foil is 5-100 μm, preferably 15-40 μm.
Further, the positive electrode active material layer 5 includes a positive electrode material, a positive electrode binder and a positive electrode conductive agent, the positive electrode material is at least one of lithium cobaltate, lithium manganate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium iron phosphate and lithium manganese iron phosphate, the positive electrode binder is polyvinylidene fluoride, and the positive electrode conductive agent is conductive carbon black and/or carbon nanotubes. The positive electrode material, the positive electrode binder and the positive electrode conductive agent include, but are not limited to, those listed above, and may be other substances commonly used in the art.
Further, the negative electrode active material layer 6 includes a negative electrode material, a negative electrode binder and a negative electrode conductive agent, the negative electrode material is at least one of graphite, a silicon-oxygen compound, a silicon-carbon compound and lithium titanate, the negative electrode binder is sodium carboxymethylcellulose and styrene butadiene rubber, and the negative electrode conductive agent is conductive carbon black and/or carbon nanotubes. The negative electrode material, the negative electrode binder, and the negative electrode conductive agent include, but are not limited to, those listed above, and may be other materials commonly used in the art.
Furthermore, the material of the diaphragm 3 is at least one of PE, PP, PVDF and PET ceramics, and the thickness of the diaphragm 3 is 5-30 μm. The diaphragm 3 is a PE film, a PP film, a PVDF film, a PET ceramic film, a PE/PP composite film, a PP/PVDF composite film, a PP/PET ceramic composite film or a PE and PET ceramic composite film.
Further, the electrolyte is a conventional liquid electrolyte including a lithium salt, a solvent, and an additive. The infiltration effect of the liquid electrolyte is better than that of the solid electrolyte.
The present invention will be described in further detail with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.
Example 1
A method for preparing an ultra-thin battery includes the following steps:
s1, coating a positive electrode active material layer on one surface of the positive electrode plate, coating a negative electrode active material layer on one surface of the negative electrode plate, and then baking and rolling; the baking temperature is 100 ℃, and the baking time is 25 min; the rolling pressure on the positive plate is 100T, and the rolling pressure on the negative plate is 10T;
s2, cutting the positive electrode sheet and the negative electrode sheet obtained in the step S1 into required shapes and sizes;
s3, attaching a sealing rubber ring to the edge of the positive electrode active material layer;
s4, impregnating the positive electrode active material layer and/or the negative electrode active material layer with an electrolyte;
and S5, arranging the positive electrode active material layer and the negative electrode active material layer in a facing manner, sandwiching a diaphragm between the positive electrode active material layer and the negative electrode active material layer, and performing heat sealing to obtain the ultrathin battery.
Wherein, the positive plate is an aluminum foil with the thickness of 8 μm, and the negative plate is a copper foil with the thickness of 5 μm.
Example 2
The difference from example 1 is:
the baking temperature is 110 ℃, and the baking time is 15 min; the rolling pressure on the positive plate is 120T, and the rolling pressure on the negative plate is 11T.
The positive plate is an aluminum foil with the thickness of 20 μm, and the negative plate is a copper foil with the thickness of 15 μm.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
The difference from example 1 is:
the baking temperature is 120 ℃, and the baking time is 10 min; the rolling pressure on the positive plate is 120T, and the rolling pressure on the negative plate is 11T.
The positive plate is an aluminum foil with a thickness of 25 μm, and the negative plate is a copper foil with a thickness of 20 μm.
The rest is the same as embodiment 1, and the description is omitted here.
Example 4
The difference from example 1 is:
the baking temperature is 50 ℃, and the baking time is 60 min; the rolling pressure on the positive plate is 120T, and the rolling pressure on the negative plate is 11T.
The positive plate is an aluminum foil with the thickness of 30 μm, and the negative plate is a copper foil with the thickness of 25 μm.
The rest is the same as embodiment 1, and the description is omitted here.
Example 5
The difference from example 1 is:
the baking temperature is 150 ℃, and the baking time is 5 min; the rolling pressure on the positive plate is 120T, and the rolling pressure on the negative plate is 11T.
The positive plate is an aluminum foil with the thickness of 100 mu m, and the negative plate is a copper foil with the thickness of 100 mu m.
The rest is the same as embodiment 1, and the description is omitted here.
Performance testing
The test results of the ultra-thin batteries obtained in examples 1 to 5 are shown in table 1.
TABLE 1 Battery size and Battery Performance test Table
| Maximum thickness/mm | Maximum length/mm | Maximum width/mm | Battery capacity/mAh | |
| Example 1 | 0.08 | 41.5 | 19.6 | 26.3 |
| Example 2 | 0.12 | 41.7 | 19.8 | 26.5 |
| Example 3 | 0.15 | 41.9 | 19.5 | 26.8 |
| Example 4 | 0.18 | 41.6 | 19.2 | 27.1 |
| Example 5 | 0.35 | 42.1 | 20.0 | 27.4 |
| Existing battery | 0.61 | 43.5 | 22.3 | 23.4 |
As can be seen from the data in table 1, the ultra-thin battery manufactured according to the present invention has a thickness significantly smaller than that of the conventional battery, and the battery capacity is not affected.
In conclusion, the ultrathin battery provided by the invention has the advantages of simple preparation process and low manufacturing cost, the prepared ultrathin battery has small thickness and capacity is not affected, and the ultrathin battery can be used for ultrathin miniature electronic equipment.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. An ultra-thin battery, characterized in that: including positive plate, negative pole piece, diaphragm, electrolyte and sealed rubber ring, the diaphragm presss from both sides and locates positive plate with between the negative pole piece, positive plate with the one side of diaphragm laminating is provided with anodal active material layer, the negative pole piece with the one side of diaphragm laminating is provided with negative active material layer, electrolyte soak in anodal active material layer and/or negative active material layer, sealed rubber ring seal set up in positive plate with between the negative pole piece.
2. The ultra-thin battery as claimed in claim 1, wherein: the insulating layer is arranged on the exposed surface of the positive plate and the exposed surface of the negative plate.
3. The ultra-thin battery as claimed in claim 1, wherein: the end of the positive plate extends to form a positive pole lug, and the end of the negative plate extends to form a negative pole lug.
4. The ultra-thin battery as claimed in claim 1, wherein: the length of the sealing rubber ring is greater than that of the diaphragm, and the width of the sealing rubber ring is greater than that of the diaphragm; the length of the sealing rubber ring is smaller than the length of the positive plate and the length of the negative plate, and the width of the sealing rubber ring is smaller than the width of the positive plate and the width of the negative plate.
5. The ultra-thin battery as claimed in claim 1, wherein: the positive plate is an aluminum foil, and the thickness of the aluminum foil is 8-100 mu m; the negative plate is a copper foil, and the thickness of the copper foil is 5-100 mu m.
6. The ultra-thin battery as claimed in claim 1, wherein: the positive active material layer comprises a positive material, a positive adhesive and a positive conductive agent, the positive material is at least one of lithium cobaltate, lithium manganate, lithium nickel cobalt manganese, lithium nickel cobalt aluminate, lithium iron phosphate and lithium iron manganese phosphate, the positive adhesive is polyvinylidene fluoride, and the positive conductive agent is conductive carbon black and/or carbon nano tubes.
7. The ultra-thin battery as claimed in claim 1, wherein: the negative electrode active material layer comprises a negative electrode material, a negative electrode adhesive and a negative electrode conductive agent, the negative electrode material is at least one of graphite, a silicon-oxygen compound, a silicon-carbon compound and lithium titanate, the negative electrode adhesive is sodium carboxymethylcellulose and styrene butadiene rubber, and the negative electrode conductive agent is conductive carbon black and/or carbon nano tubes.
8. The ultra-thin battery as claimed in claim 1, wherein: the diaphragm is made of at least one of PE, PP, PVDF and PET ceramics, and the thickness of the diaphragm is 5-30 μm.
9. A method for manufacturing an ultra-thin battery according to any one of claims 1 to 8, comprising the steps of:
s1, coating a positive electrode active material layer on one surface of the positive electrode plate, coating a negative electrode active material layer on one surface of the negative electrode plate, and then baking and rolling;
s2, cutting the positive electrode sheet and the negative electrode sheet obtained in the step S1 into required shapes and sizes;
s3, attaching a sealing rubber ring to the edge of the positive electrode active material layer;
s4, impregnating the positive electrode active material layer and/or the negative electrode active material layer with an electrolyte;
and S5, arranging the positive electrode active material layer and the negative electrode active material layer in a facing manner, sandwiching a diaphragm between the positive electrode active material layer and the negative electrode active material layer, and performing heat sealing to obtain the ultrathin battery.
10. The method for manufacturing an ultra-thin battery according to claim 9, characterized in that: in step S1, the baking temperature is 50-150 ℃, the baking time is 5-60 min, and the rolling pressure is 8-150T.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115461912A (en) * | 2020-05-15 | 2022-12-09 | 宁德新能源科技有限公司 | Packaging film, electrochemical device, and electronic device |
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Application publication date: 20200207 |