CN114361721A - Laminated lithium ion battery core package and preparation method thereof - Google Patents
Laminated lithium ion battery core package and preparation method thereof Download PDFInfo
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- CN114361721A CN114361721A CN202111618584.5A CN202111618584A CN114361721A CN 114361721 A CN114361721 A CN 114361721A CN 202111618584 A CN202111618584 A CN 202111618584A CN 114361721 A CN114361721 A CN 114361721A
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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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Abstract
The invention relates to a laminated lithium ion battery core package and a preparation method thereof, wherein the core package comprises a diaphragm, a positive plate and a negative plate, the positive plate and the negative plate both comprise current collectors, and the surfaces of the current collectors are provided with active material layers, and the laminated lithium ion battery core package is characterized in that: the positive plate current collector is coated with ceramic insulating layers along the length direction surface and positioned on two sides of the active material layer, and the lug side of the negative plate current collector and the surface of the opposite side of the lug are coated with the ceramic insulating layers; the width of the positive plate is the same as that of the negative plate. The laminated lithium ion battery core package has the advantages that the diaphragm is not discontinuous, so that the pole piece wrinkles and short circuit hidden troubles caused by pulling the pole piece due to the contraction of the diaphragm are avoided; the widths of the positive and negative pole pieces are designed to be consistent, and the edges of the pole pieces are coated with ceramic and sealed, so that the short circuit hidden danger caused by dislocation of the pole pieces is greatly reduced; the positive and negative ceramic insulating layer composite diaphragms are combined into a whole, so that the core package is prevented from deforming.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a laminated lithium ion battery core package and a preparation method thereof.
Background
The lithium ion battery has unique advantages and can be widely applied to the field of new energy, and the production process of the lithium ion battery can be divided into a winding type and a laminated type according to a core package structure. If the high-aspect-ratio battery adopts a winding type structure, a winding needle is required to be relatively long, the tension consistency is difficult to control during winding, and the hidden danger of wrinkling of a pole piece and a diaphragm exists, so that a laminated structure is adopted for a high-aspect-ratio battery core. However, due to the inconsistent sizes of the positive and negative electrode plates, the core package in the lamination process and after lamination has the problem of dislocation of the positive and negative electrode plates due to the inconsistent transfer and internal stress, so that the short circuit hidden trouble exists, and the production efficiency is low.
In order to prevent the dislocation of the positive and negative plates of the laminated core package, a gluing diaphragm is usually adopted, the laminated core package is fixed together by adopting a thermal compounding mode to prevent the dislocation of the plates, but the cost is higher, and the influence of the gluing diaphragm on the performance of the lithium battery is negative, so that the service life of the lithium battery is shorter.
Disclosure of Invention
The invention aims to provide a laminated lithium ion battery core package, which avoids pole piece wrinkles and short circuit hidden troubles caused by pulling pole pieces due to contraction of diaphragms, reduces the short circuit hidden troubles caused by dislocation of the pole pieces, and is not easy to deform.
The technical scheme adopted by the invention for solving the problems is as follows: a laminated lithium ion battery core package comprises a diaphragm, a positive plate and a negative plate, wherein the positive plate and the negative plate respectively comprise current collectors, active material layers are arranged on the surfaces of the current collectors, ceramic insulating layers are coated on the surfaces of the positive plate current collectors along the length direction and positioned on two sides of the active material layers, and ceramic insulating layers are coated on the lug side of the negative plate current collectors and the surface of the opposite side of the lug; the width of the positive plate is the same as that of the negative plate.
Preferably, the separator is a coated separator or an uncoated organic microporous film.
More preferably, the coated membrane is a membrane coated with a heat-conducting and insulating inorganic ceramic material, the coated membrane is an alumina membrane, a silica membrane or a boehmite membrane, and the uncoated organic microporous membrane is a PE membrane, a PP membrane or a PP and PE composite membrane.
Preferably, the thickness of the ceramic insulating layer is less than or equal to that of the active material layer.
Preferably, the ceramic insulating layer includes a binder and inorganic ceramic particles.
More preferably, the inorganic ceramic particles are one or more of alumina, silica and boehmite, and the mass ratio of the binder to the inorganic ceramic particles is 100:10 to 100: 20.
Preferably, the active material area coated on the positive electrode sheet in the width direction and the active material area coated on the negative electrode sheet in the length direction are smaller than those coated on the corresponding positive electrode sheet.
Another object of the present invention is to provide a method for preparing a laminated lithium ion battery core package, comprising the following steps:
(1) preparation of positive plate
Coating an active material on the positive current collector and drying to enable the surface of the current collector to be provided with an active material layer, coating a ceramic insulating material on the surface of the positive current collector along the length direction of the positive current collector and positioned at two sides of the active material layer, and drying to enable the surface of the current collector to be provided with a ceramic insulating layer to obtain a positive plate;
(2) preparation of negative plate
Coating an active material on a negative current collector to enable the surface of the current collector to be provided with an active material layer, and coating a ceramic insulating material on the lug side of a negative current collector and the surface of the opposite side of the lug to enable the surface of the current collector to be provided with a ceramic insulating layer to obtain a negative plate;
(3) compounding of pole piece and diaphragm
Thermally compounding a layer of diaphragm on each surface of the positive plate or the negative plate in a rolling thermal compounding manner;
(4) pole piece die cutting
Respectively cutting the positive plate and the negative plate into single positive plates and single negative plates;
(5) core package stacking
Stacking the single positive plate and the single negative plate in the steps into a specified number of layers according to the sequence of the negative plate and the positive plate, wherein the uppermost layer is the negative plate, and the core package is fixed by adhesive paper;
(6) core-in-core thermal compounding
And carrying out hot pressing on the core cladding in the step to thermally compound the ceramic insulating layer of the other non-thermally compounded diaphragm pole piece and the diaphragm together.
Preferably, the length of the ceramic insulating layer in the step (1) is longer than the length of the active material coating by more than 8mm, and the center line of the long side of the ceramic insulating layer is superposed with the center line of the long side of the active material coating.
The preparation method of the positive plate comprises the following steps:
(1) preparation of positive plate
Coating an active material on the positive current collector and drying to enable the surface of the current collector to be provided with an active material layer, coating ceramic insulating materials on two sides of the coated active material layer along the length direction of the positive current collector and drying to enable the surface of the current collector to be provided with a ceramic insulating layer;
(2) preparation of negative plate
Coating an active material on a negative current collector to enable the surface of the current collector to be provided with an active material layer, and coating a ceramic insulating material on the lug side of a negative current collector and the surface of the opposite side of the lug to enable the surface of the current collector to be provided with a ceramic insulating layer to obtain a negative plate;
(3) compounding of positive plate and diaphragm
Thermally compounding a layer of diaphragm on each of the two surfaces of the positive plate obtained in the step (1) by adopting a rolling thermal compounding mode, wherein the width of the diaphragm is equal to the width of the positive plate (namely the width of an active material coating of the positive plate plus the width of ceramic layers on the two sides of the positive plate), and the length of the diaphragm is consistent with the length of a ceramic insulating layer coated on the positive plate and is fully covered with the ceramic layers on the positive plate;
(4) positive plate slitting
Cutting the positive plate pole roll obtained in the step (3) into pole rolls with single pole piece width by adopting hardware or laser die cutting;
(5) edge sealing of positive plate
Hot rolling the ceramic insulating layer of the positive plate in the step (4) to ensure that the ceramic area is molten, expanded and diffused to the edge of the plate and covers the positive current collector;
(6) die cutting of positive plate
Cutting the positive plate obtained in the step (5) into single plates by adopting hardware or laser die cutting;
(7) edge cutting and sealing of negative plate
Cutting off the ceramic insulating layer on the opposite side of the cathode plate tab by 1-2mm, and adopting a hot rolling mode to ensure that the ceramic area is molten and expanded to the edge of the most electrode plate and covers the cathode plate current collector;
(8) die cutting of negative plate
Cutting the negative pole piece into single pole pieces by adopting hardware or laser die cutting;
(9) core package stacking
Stacking the single pole pieces in the steps (6) and (8) into a specified number of layers according to the sequence of the negative pole pieces and the positive pole pieces, wherein the uppermost layer is the negative pole piece, and the core package is fixed by adhesive paper;
(10) core-in-core thermal compounding
And (4) carrying out hot pressing on the core cladding obtained in the step (9) to thermally compound the ceramic insulating layer of the negative plate and the diaphragm together.
The preparation method of the negative plate comprises the following steps:
(1) preparation of positive plate
Coating an active material on the positive current collector and drying to enable the surface of the current collector to be provided with an active material layer, coating ceramic insulating materials on two sides of the coated active material layer along the length direction of the positive current collector and drying to enable the surface of the current collector to be provided with a ceramic insulating layer;
(2) preparation of negative plate
Coating an active material on a negative current collector to enable the surface of the current collector to be provided with an active material layer, and coating a ceramic insulating material on the lug side of a negative current collector and the surface of the opposite side of the lug to enable the surface of the current collector to be provided with a ceramic insulating layer to obtain a negative plate;
(3) edge cutting and sealing of negative plate
Cutting off 1-2mm of the ceramic coating on the opposite side of the pole lug of the negative pole piece, and adopting a hot rolling mode to ensure that the ceramic area is molten, expanded and diffused to the edge of the pole piece and covers the current collector of the negative pole piece;
(4) negative plate and diaphragm composite
Thermally compounding a layer of diaphragm on each surface of the cathode plate in the step (2) by adopting a rolling thermal compounding mode, wherein the diaphragm covers the active material layer and the ceramic insulating layer, and extends 1-2mm along the width direction of the ceramic insulating layers on two sides respectively;
(5) die cutting of negative plate
Cutting the negative pole piece obtained in the step (4) into single pole pieces by adopting hardware or laser die cutting;
(6) positive plate slitting
Cutting the positive plate pole roll obtained in the step (2) into pole rolls with single pole piece width by adopting hardware or laser die cutting;
(7) edge sealing of positive plate
Hot rolling the positive plate ceramic insulating layer obtained in the step (5) to enable the ceramic area to be molten and expanded and diffused to the edge of the plate, and covering a positive current collector;
(8) die cutting of positive plate
Cutting the positive plate obtained in the step (7) into single plates by adopting hardware or laser die cutting;
(9) core package stacking
Stacking the single pole pieces obtained in the step (5) and the step (8) into a specified number of layers according to the sequence of the negative pole pieces and the positive pole pieces, wherein the uppermost layer is the negative pole piece, and the core package is fixed by adhesive paper;
(10) core-in-core thermal compounding
And (4) carrying out hot pressing on the core cladding obtained in the step (9) to thermally compound the ceramic insulating layer of the positive pole piece and the diaphragm together.
Compared with the prior art, the invention has the advantages that:
(1) the invention avoids the pole piece wrinkles and short circuit hidden troubles caused by pulling the pole piece due to the contraction of the diaphragm by adopting the discontinuous diaphragm;
(2) the invention adopts the design that the widths of the positive and negative pole pieces are consistent, thereby greatly reducing the probability of dislocation short circuit caused by inconsistent widths of the pole pieces, and reducing the hidden trouble of short circuit caused by dislocation of the pole pieces again by coating ceramic on the edges of the pole pieces and sealing edges;
(3) the invention compounds the positive and negative ceramic insulating layer composite diaphragm into a whole by the core cladding, thereby preventing the core cladding from deforming
(4) In the invention, because the positive plate is only cut on the ceramic insulating layer or the current collector, less dust is generated in the process, and the control of the hidden trouble of short circuit of the battery cell is facilitated.
Drawings
Fig. 1 is a schematic structural view of a positive electrode sheet in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a negative electrode sheet in example 1 of the present invention.
Fig. 3 is a comparison graph of cycle life of lithium batteries prepared from the lithium battery core package of example 1 of the present invention and a prior art rubberized separator core package, respectively.
Wherein, 1 is a positive plate, 1.1 is a positive active material layer, 1.2 is a positive ceramic insulating layer, 2 is a negative plate, 2.1 is a negative active material layer, 2.2 is a negative ceramic insulating layer, 3 is a positive tab, and 4 is a negative tab.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
A laminated lithium ion battery core package comprises a diaphragm PE film, a positive plate 1 and a negative plate 2, wherein the positive plate 1 is connected with a positive electrode tab 3, and the negative plate 2 is connected with a negative electrode tab 4;
the positive plate 1 comprises a positive current collector, a positive active material layer 1.1 is arranged on the surface of the positive current collector, and positive ceramic insulating layers 1.2 are coated on the surface of the positive current collector along the length direction and positioned on two sides of the positive active material layer 1.1; the negative plate comprises a negative current collector, a negative active material layer 2.1 is arranged on the surface of the negative current collector, and a negative ceramic insulating layer 2.2 is coated on the side of a negative electrode lug 4 of the negative current collector and the surface of the opposite side of the negative electrode lug 4.
The active material areas coated on the positive plate 1 in the width direction and the length direction are smaller than the active material areas coated on the corresponding negative plate 2; the width of the positive plate 1 is the same as that of the negative plate 2.
The thickness of the ceramic insulating layer is smaller than or equal to that of the active material layer, and the ceramic insulating layer comprises a binder and inorganic ceramic particle silicon dioxide in a mass ratio of 100: 10.
A preparation method of a laminated lithium ion battery core package comprises the following steps:
(1) preparation of positive plate
Coating an active material on a positive current collector and drying to enable the surface of the current collector to be provided with an active material layer, coating ceramic insulating materials on two sides of the coated active material layer along the length direction of the positive current collector and drying to enable the surface of the current collector to be provided with a ceramic insulating layer, wherein the length of the ceramic insulating layer is 10mm longer than that of a coating of the active material, and the central line of the long side of the ceramic insulating layer is superposed with that of the long side of the coating of the active material;
(2) preparation of negative plate
Coating an active material on a negative current collector to enable the surface of the current collector to be provided with an active material layer, and coating a ceramic insulating material on the lug side of a negative current collector and the surface of the opposite side of the lug to enable the surface of the current collector to be provided with a ceramic insulating layer to obtain a negative plate;
(3) compounding of positive plate and diaphragm
Thermally compounding a layer of diaphragm on each of the two surfaces of the positive plate obtained in the step (1) by adopting a rolling thermal compounding mode, wherein the width of the diaphragm is equal to the width of the positive plate (namely the width of an active material coating of the positive plate plus the width of ceramic layers on the two sides of the positive plate), and the length of the diaphragm is consistent with the length of a ceramic insulating layer coated on the positive plate and is fully covered with the ceramic layers on the positive plate;
(4) positive plate slitting
Cutting the positive plate pole roll obtained in the step (3) into pole rolls with single pole piece width by adopting hardware or laser die cutting;
(5) edge sealing of positive plate
Hot rolling the ceramic insulating layer of the positive plate in the step (4) to ensure that the ceramic area is molten, expanded and diffused to the edge of the plate and covers the positive current collector;
(6) die cutting of positive plate
Cutting the positive plate obtained in the step (5) into single plates by adopting hardware or laser die cutting;
(7) edge cutting and sealing of negative plate
Cutting off the ceramic insulating layer on the opposite side of the cathode plate tab by 1-2mm, and adopting a hot rolling mode to ensure that the ceramic area is molten and expanded to the edge of the most electrode plate and covers the cathode plate current collector;
(8) die cutting of negative plate
Cutting the negative pole piece into single pole pieces by adopting hardware or laser die cutting;
(9) core package stacking
Stacking the single pole pieces in the steps (6) and (8) into a specified number of layers according to the sequence of the negative pole pieces and the positive pole pieces, wherein the uppermost layer is the negative pole piece, and the core package is fixed by adhesive paper;
(10) core-in-core thermal compounding
And (4) carrying out hot pressing on the core cladding obtained in the step (9) to thermally compound the ceramic insulating layer of the negative plate and the diaphragm together.
A comparison of cycle life of lithium batteries prepared from the lithium battery core package of example 1 and the prior art rubberized separator core package is shown in fig. 2, which shows that the cycle life of lithium batteries prepared from the battery core package of example is better than that of lithium batteries prepared from the prior art rubberized separator core package.
Example 2
A laminated lithium ion battery cell package, the same as example 1, except that: the diaphragm is a silicon dioxide diaphragm, and the ceramic insulating layer comprises a binder and inorganic ceramic particle alumina in a mass ratio of 100: 20.
A preparation method of a laminated lithium ion battery core package comprises the following steps:
(1) preparation of positive plate
Coating an active material on the positive current collector and drying to enable the surface of the current collector to be provided with an active material layer, coating ceramic insulating materials on two sides of the coated active material layer along the length direction of the positive current collector and drying to enable the surface of the current collector to be provided with a ceramic insulating layer;
(2) preparation of negative plate
Coating an active material on a negative current collector to enable the surface of the current collector to be provided with an active material layer, and coating a ceramic insulating material on the lug side of a negative current collector and the surface of the opposite side of the lug to enable the surface of the current collector to be provided with a ceramic insulating layer to obtain a negative plate;
(3) edge cutting and sealing of negative plate
Cutting off 1-2mm of the ceramic coating on the opposite side of the pole lug of the negative pole piece, and adopting a hot rolling mode to ensure that the ceramic area is molten, expanded and diffused to the edge of the pole piece and covers the current collector of the negative pole piece;
(4) negative plate and diaphragm composite
Thermally compounding a layer of diaphragm on each surface of the cathode plate in the step (2) by adopting a rolling thermal compounding mode, wherein the diaphragm covers the active material layer and the ceramic insulating layer, and extends 1-2mm along the width direction of the ceramic insulating layers on two sides respectively;
(5) die cutting of negative plate
Cutting the negative pole piece obtained in the step (4) into single pole pieces by adopting hardware or laser die cutting;
(6) positive plate slitting
Cutting the positive plate pole roll obtained in the step (2) into pole rolls with single pole piece width by adopting hardware or laser die cutting;
(7) edge sealing of positive plate
Hot rolling the positive plate ceramic insulating layer obtained in the step (5) to enable the ceramic area to be molten and expanded and diffused to the edge of the plate, and covering a positive current collector;
(8) die cutting of positive plate
Cutting the positive plate obtained in the step (7) into single plates by adopting hardware or laser die cutting;
(9) core package stacking
Stacking the single pole pieces obtained in the step (5) and the step (8) into a specified number of layers according to the sequence of the negative pole pieces and the positive pole pieces, wherein the uppermost layer is the negative pole piece, and the core package is fixed by adhesive paper;
(10) core-in-core thermal compounding
And (4) carrying out hot pressing on the core cladding obtained in the step (9) to thermally compound the ceramic insulating layer of the positive pole piece and the diaphragm together.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a lamination formula lithium ion battery core package, the core package includes diaphragm, positive plate, negative pole piece, positive plate and negative pole piece all include the mass flow body, the mass flow body surface all has active material layer, its characterized in that: the positive plate current collector is coated with ceramic insulating layers along the length direction surface and positioned on two sides of the active material layer, and the lug side of the negative plate current collector and the surface of the opposite side of the lug are coated with the ceramic insulating layers; the width of the positive plate is the same as that of the negative plate.
2. The laminated lithium ion battery cell package of claim 1, wherein: the diaphragm is a coating diaphragm or an uncoated organic microporous film.
3. The laminated lithium ion battery cell package of claim 1, wherein: the thickness of the ceramic insulating layer is less than or equal to that of the active material layer.
4. The laminated lithium ion battery cell package of claim 1, wherein: the ceramic insulating layer includes a binder and inorganic ceramic particles.
5. The laminated lithium ion battery cell package of claim 1, wherein: the active material areas coated in the width direction and the length direction of the positive plate are smaller than the active material areas coated on the corresponding negative plate.
6. A method of making a laminated lithium ion battery cell pack according to any of claims 1-5, wherein: the method comprises the following steps:
(1) preparation of positive plate
Coating an active material on the positive current collector and drying to enable the surface of the current collector to be provided with an active material layer, coating a ceramic insulating material on the surface of the positive current collector along the length direction of the positive current collector and positioned at two sides of the active material layer, and drying to enable the surface of the current collector to be provided with a ceramic insulating layer to obtain a positive plate;
(2) preparation of negative plate
Coating an active material on a negative current collector to enable the surface of the current collector to be provided with an active material layer, and coating a ceramic insulating material on the lug side of a negative current collector and the surface of the opposite side of the lug to enable the surface of the current collector to be provided with a ceramic insulating layer to obtain a negative plate;
(3) compounding of pole piece and diaphragm
Thermally compounding a layer of diaphragm on each surface of the positive plate or the negative plate in a rolling thermal compounding manner;
(4) pole piece die cutting
Respectively cutting the positive plate and the negative plate into single positive plates and single negative plates;
(5) core package stacking
Stacking the single positive plate and the single negative plate in the steps into a specified number of layers according to the sequence of the negative plate and the positive plate, wherein the uppermost layer is the negative plate, and the core package is fixed by adhesive paper;
(6) core-in-core thermal compounding
And carrying out hot pressing on the core cladding in the step to thermally compound the ceramic insulating layer of the other non-thermally compounded diaphragm pole piece and the diaphragm together.
7. The method of making a laminated lithium ion battery cell package of claim 6, wherein: the length of the ceramic insulating layer in the step (1) is longer than the length of the active material coating by more than 8mm, and the center line of the long side of the ceramic insulating layer is superposed with the center line of the long side of the active material coating.
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| CN116864779A (en) * | 2023-09-01 | 2023-10-10 | 北京石墨烯技术研究院有限公司 | Battery core, button cell, and preparation method and application of button cell |
| WO2024016447A1 (en) * | 2022-07-19 | 2024-01-25 | 宁德时代新能源科技股份有限公司 | Current collector, electrode sheet, battery cell, hot-pressing mold, battery, and electric device |
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