CN114024042A - Preparation method of multi-tab lithium battery - Google Patents
Preparation method of multi-tab lithium battery Download PDFInfo
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- CN114024042A CN114024042A CN202111219411.6A CN202111219411A CN114024042A CN 114024042 A CN114024042 A CN 114024042A CN 202111219411 A CN202111219411 A CN 202111219411A CN 114024042 A CN114024042 A CN 114024042A
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- pole piece
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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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound 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
- 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
- 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
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a multi-tab lithium battery, which comprises the following steps: step one, intermittently coating active substance slurry on a current collector to prepare a plurality of positive pole pieces and negative pole pieces with alternate coating areas and empty foil areas; step two, rolling the pole piece to a preset thickness; thirdly, cutting the rolled pole piece into preset widths; placing the positive pole piece and the negative pole piece in a mutually vertical mode, and sequentially winding along the direction of the positive pole piece or the direction of the negative pole piece to form a winding core, so that preset empty foil areas are reserved at two ends to serve as tabs; step five, removing the empty foil area separation film at the periphery of the winding core, and then welding the empty foil into a tab; and step six, packaging, baking, injecting liquid, forming and grading to obtain the multi-electrode ear lithium ion battery. According to the invention, the structure of the battery cell is optimized, the complete alignment of the lugs is ensured, and the flatness of the battery cell can be improved.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a multi-tab lithium battery.
Background
The lithium ion battery has the advantages of high energy density, no memory effect, long cycle life, environmental friendliness and the like, is distinguished in chemical energy storage devices, and is widely concerned by industries such as electric vehicles and 3C. The lithium ion battery appears in the aspects of our life and is closely related to our work and study. Because of the energy storage of lithium cell is limited, when battery power always will have the too low, for reducing charge time, promote work, learning efficiency, alleviate and wait for anxiety. Fast charging becomes an important performance requirement for 3C products.
In order to realize rapid charging, chemical systems such as a positive electrode, a negative electrode, electrolyte, a diaphragm and the like are adjusted on the basis of a single tab, so that the charging speed of the lithium ion battery is greatly improved due to the development of multiple tabs.
What present multi-tab electric core adopted is that the empty paper tinsel is reserved on pole piece coating both sides, through cross cutting equipment before convoluteing, becomes the empty paper tinsel of a plurality of utmost points ears with continuous empty paper tinsel, then makes the combination of multi-pole ears be in the same place through the welding, forms multi-tab electric core, but the equipment required precision of this structure is high, easily appears utmost point ear uneven condition. The other mode is as follows: after the pole piece coating, through a plurality of utmost point ear positions of laser location, then in the location department, clear up a plurality of utmost point ear trench, through the roll-in, weld utmost point ear, form many utmost point ear electricity core behind the dye jigger, nevertheless can increase the unevenness degree of electricity core, easily lead to electric core to warp.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the preparation method of the multi-tab lithium battery is provided, the tab is ensured to be completely aligned by optimizing the structure of the battery cell, and the flatness of the battery cell can be improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a multi-tab lithium battery comprises the steps of firstly, discontinuously coating active substance slurry on a current collector to prepare a plurality of positive pole pieces and negative pole pieces with alternate coating areas and empty foil areas; step two, rolling the pole piece to a preset thickness; thirdly, cutting the rolled pole piece into preset widths; placing the positive pole piece and the negative pole piece in a mutually vertical mode, and sequentially winding along the direction of the positive pole piece or the direction of the negative pole piece to form a winding core, so that preset empty foil areas are reserved at two ends to serve as tabs; step five, removing the empty foil area separation film at the periphery of the winding core, and then welding the empty foil into a tab; and step six, packaging, baking, injecting liquid, forming and grading to obtain the multi-electrode ear lithium ion battery.
Preferably, in the first step, the method further comprises:
and sequentially coating the prepared positive electrode slurry and the prepared negative electrode slurry on a positive electrode current collector and a current collector in a clearance coating mode.
Preferably, in the fourth step, the method further comprises:
and the first folds of the pole pieces are aligned, so that the length and the width of the negative pole piece are larger than those of the positive pole piece, and then the negative pole piece is wound in the positive direction or the negative direction in sequence.
Preferably, in the fifth step, the method further includes:
welding the tab on the empty foil area through high-temperature ultrasonic welding, and heating and melting the diaphragm at the empty foil area at a high temperature;
and respectively welding the tabs at the positions of the empty foil areas at the periphery of the winding core by ultrasonic welding.
Preferably, in the sixth step, the multi-tab lithium ion battery has two positive electrode tabs and two negative electrode tabs.
Preferably, the two positive electrode tabs are arranged oppositely, and the two negative electrode tabs are arranged oppositely.
Preferably, in the first step, the coating area is square.
The method has the beneficial effects that the method comprises the step one of discontinuously coating the active substance slurry on a current collector to prepare a plurality of positive pole pieces and negative pole pieces with alternate coating areas and empty foil areas; step two, rolling the pole piece to a preset thickness; thirdly, cutting the rolled pole piece into preset widths; placing the positive pole piece and the negative pole piece in a mutually vertical mode, and sequentially winding along the direction of the positive pole piece or the direction of the negative pole piece to form a winding core, so that preset empty foil areas are reserved at two ends to serve as tabs; step five, removing the empty foil area separation film at the periphery of the winding core, and then welding the empty foil into a tab; and step six, packaging, baking, injecting liquid, forming and grading to obtain the multi-electrode ear lithium ion battery. Because what present multi-tab electricity core adopted is that the pole piece coats both sides and reserves empty paper tinsel, through cross cutting equipment before coiling, become a plurality of utmost point ear empty paper tinsels with continuous empty paper tinsel, then make the combination of multi-pole ear together through the welding, form multi-tab electricity core, but the equipment precision of this structure requires highly, the uneven condition of utmost point ear easily appears. The other mode is as follows: after coating the pole piece, positioning a plurality of pole lug positions by laser, cleaning a plurality of pole lug grooves at the positioning positions, rolling, welding the pole lugs, and carrying out jig dyeing to form a multi-pole lug battery cell, wherein the unevenness of the battery cell can be increased, and the battery cell is easy to deform, so that in the first step, active substance slurry is coated, namely the prepared positive and negative electrode slurry is sequentially coated on positive and negative current collectors, the coating mode is gap coating, the current collectors which are not coated with active substances in gaps can be finally welded on an instrument to prepare the pole lugs, in the second step, the coated pole piece is rolled to the designed thickness requirement by rolling, and in the third step, the rolled pole piece is cut into the designed width by splitting; in the fourth step, compared with the existing winding, the positive pole and the negative pole are positioned on planes which are parallel to each other, and the winding core is manufactured by winding along one direction, the positive pole piece and the negative pole piece of the invention are mutually and vertically placed and are sequentially wound along the direction of the positive pole or the negative pole piece, enough empty foil areas are reserved at two ends to be used as pole lugs, the length and the width of the positive pole always exceed the negative pole, the positive pole piece is ensured to have the negative pole piece corresponding to the positive pole piece, and when the positive pole piece and the negative pole piece are mutually and vertically wound, uncoated current collectors are uniformly distributed at two sides of the pole pieces and are used for welding points of the pole lugs, the positive pole piece and the negative pole piece are separated through an isolating film, and the winding core is finally manufactured; and step six, sequentially carrying out processes of packaging, baking, liquid injection, formation, capacity grading and the like on the winding core, and finally obtaining the multi-tab battery cell with two positive tabs and two negative tabs. According to the invention, the structure of the battery cell is optimized, the complete alignment of the lugs is ensured, and the flatness of the battery cell can be improved.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic view of the coated electrode sheet of the present invention.
FIG. 2 is a schematic view of the pole piece of the present invention before winding.
FIG. 3 is a schematic view of the wound pole piece of the present invention.
Fig. 4 is a schematic diagram of a battery cell manufactured according to the present invention.
Wherein the reference numerals are as follows:
wherein the reference numerals are as follows:
1-positive pole piece;
2-negative pole piece;
3-a coating area;
4-empty foil area.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail with reference to fig. 1 to 4, but the present invention is not limited thereto.
The preparation method of the multi-tab lithium battery comprises the steps of firstly, discontinuously coating active substance slurry on a current collector to prepare a plurality of positive pole pieces 1 and negative pole pieces 2 with alternate coating areas 3 and empty foil areas 4; step two, rolling the pole piece to a preset thickness; thirdly, cutting the rolled pole piece into preset widths; placing the positive pole piece 1 and the negative pole piece 2 in a mutually vertical mode, and sequentially winding along the direction of the positive pole piece 1 or the direction of the negative pole piece 2 to form a winding core, so that preset empty foil areas 4 are reserved at two ends to serve as tabs; fifthly, removing the diaphragms in the empty foil areas 4 around the winding core, and welding the empty foils into tabs; and step six, packaging, baking, injecting liquid, forming and grading to obtain the multi-electrode ear lithium ion battery.
It should be noted that: because what present multi-tab electricity core adopted is that the pole piece coats both sides and reserves empty paper tinsel, through cross cutting equipment before coiling, become a plurality of utmost point ear empty paper tinsels with continuous empty paper tinsel, then make the combination of multi-pole ear together through the welding, form multi-tab electricity core, but the equipment precision of this structure requires highly, the uneven condition of utmost point ear easily appears. The other mode is as follows: after coating the pole piece, positioning a plurality of pole lug positions by laser, cleaning a plurality of pole lug grooves at the positioning positions, rolling, welding the pole lugs, and carrying out jig dyeing to form a multi-pole lug battery cell, wherein the unevenness of the battery cell can be increased, and the battery cell is easy to deform, so that in the first step, active substance slurry is coated, namely the prepared positive and negative electrode slurry is sequentially coated on positive and negative current collectors, the coating mode is gap coating, the current collectors which are not coated with active substances in gaps can be finally welded on an instrument to prepare the pole lugs, in the second step, the coated pole piece is rolled to the designed thickness requirement by rolling, and in the third step, the rolled pole piece is cut into the designed width by splitting; in the fourth step, compared with the existing winding, the positive pole and the negative pole are positioned on planes which are parallel to each other, and the winding core is manufactured by winding along one direction, the positive pole piece and the negative pole piece of the invention are mutually and vertically placed and are sequentially wound along the direction of the positive pole or the direction of the negative pole piece 2, enough empty foil areas 4 are reserved at two ends to be used as lugs, the length and the width of the positive pole are ensured to always exceed the negative pole, the positive pole piece 1 is ensured to have the negative pole piece 2 corresponding to the positive pole piece 1, and when the positive pole piece and the negative pole piece are mutually and vertically wound, uncoated current collectors are uniformly distributed on two sides of the pole pieces and are used for welding point positions of the lugs, the positive pole piece and the negative pole piece are separated through an isolating film, and finally the winding core is manufactured; and step six, sequentially carrying out processes of packaging, baking, liquid injection, formation, capacity grading and the like on the winding core, and finally obtaining the multi-tab battery cell with two positive tabs and two negative tabs.
Compared with the existing multi-tab preparation process, the cell preparation process disclosed by the invention is short in time consumption, simple in process and low in investment cost, the cell charging rate is increased, and the cell charging temperature rise is reduced.
In addition, the positive and negative pole pieces are vertically placed and sequentially wound, arc corners caused by parallel winding of the pole pieces are avoided, the flatness of the battery cell can be improved, the lugs are welded in an exposed mode, the energy density of the battery cell can be improved, and the alignment difficulty of a plurality of lugs is reduced.
In the first step of the method for preparing a multi-tab lithium battery, the method further comprises the following steps:
and sequentially coating the prepared positive electrode slurry and the prepared negative electrode slurry on a positive electrode current collector and a current collector in a clearance coating mode.
It should be noted that gap coating is adopted, so that a plurality of coating regions 3 are arranged on the pole piece at intervals.
In the fourth step of the method for preparing a multi-tab lithium battery according to the present invention, the method further comprises:
and (3) placing the first folds of the pole pieces in alignment so that the length and width of the negative pole piece 2 are larger than those of the positive pole piece 1, and then sequentially winding in the positive direction or the negative direction.
It should be noted that: when the winding is vertical to each other, the uncoated current collectors are uniformly distributed on two sides of the pole pieces and are used for welding point positions of the pole lugs, the positive pole piece and the negative pole piece are separated by using an isolating film, and finally, the winding core is manufactured. The first folding of the pole piece is aligned, so that the coating area 3 of the positive pole piece 1 and the coating area 3 of the negative pole piece 2 are in one-to-one correspondence, before and after winding, the coating area 3 of the positive pole piece 1 covers the coating area 3 of the negative pole piece 2, and the areas of the coating area 3 of the positive pole piece 1 and the coating area 3 of the negative pole piece 2 are approximately equal.
In the fifth step, the method for preparing the multi-tab lithium battery further comprises:
welding a tab on the empty foil area 4 by high-temperature ultrasonic welding, and heating and melting the diaphragm at the empty foil area 4 at a high temperature;
and respectively welding the tabs at the positions of the empty foil areas 4 on the periphery of the winding core by ultrasonic welding.
In the method for manufacturing a multi-tab lithium battery according to the present invention, in step six, the multi-tab lithium ion battery has two positive electrode tabs and two negative electrode tabs.
According to the preparation method of the multi-tab lithium battery, the two positive tabs are oppositely arranged, and the two negative tabs are oppositely arranged, but the invention is not limited to this, and the polarity of the pole piece can be adjusted according to the actual production requirement.
In the method for preparing a multi-tab lithium battery according to the present invention, in the first step, the coating region 3 is square, but the present invention is not limited thereto, and the shape of the coating region 3 may be other regular or irregular shapes, preferably square, according to actual production requirements.
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 (7)
1. A preparation method of a multi-tab lithium battery is characterized by comprising the following steps:
step one, intermittently coating active substance slurry on a current collector to prepare a plurality of positive pole pieces and negative pole pieces with alternate coating areas and empty foil areas;
step two, rolling the pole piece to a preset thickness;
thirdly, cutting the rolled pole piece into preset widths;
placing the positive pole piece and the negative pole piece in a mutually vertical mode, and sequentially winding along the direction of the positive pole piece or the direction of the negative pole piece to form a winding core, so that preset empty foil areas are reserved at two ends to serve as tabs;
step five, removing the empty foil area separation film at the periphery of the winding core, and then welding the empty foil into a tab;
and step six, packaging, baking, injecting liquid, forming and grading to obtain the multi-electrode ear lithium ion battery.
2. The method for preparing a multi-tab lithium battery as claimed in claim 1, wherein the first step further comprises:
and sequentially coating the prepared positive electrode slurry and the prepared negative electrode slurry on a positive electrode current collector and a current collector in a clearance coating mode.
3. The method for preparing a multi-tab lithium battery as claimed in claim 1, wherein the fourth step further comprises:
and the first folds of the pole pieces are aligned, so that the length and the width of the negative pole piece are larger than those of the positive pole piece, and then the negative pole piece is wound in the positive direction or the negative direction in sequence.
4. The method for preparing a multi-tab lithium battery as claimed in claim 1, wherein in the fifth step, the method further comprises:
welding the tab on the empty foil area through high-temperature ultrasonic welding, and heating and melting the diaphragm at the empty foil area at a high temperature;
and respectively welding the tabs at the positions of the empty foil areas at the periphery of the winding core by ultrasonic welding.
5. The method of claim 1 for preparing a multi-tab lithium battery, wherein: in the sixth step, the multi-electrode-lug lithium ion battery is provided with two positive electrode lugs and two negative electrode lugs.
6. The method of claim 5 for preparing a multi-tab lithium battery, wherein: the two positive electrode tabs are arranged oppositely, and the two negative electrode tabs are arranged oppositely.
7. The method of claim 1 for preparing a multi-tab lithium battery, wherein: in the first step, the coating area is square.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111219411.6A CN114024042A (en) | 2021-10-20 | 2021-10-20 | Preparation method of multi-tab lithium battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111219411.6A CN114024042A (en) | 2021-10-20 | 2021-10-20 | Preparation method of multi-tab lithium battery |
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| CN114024042A true CN114024042A (en) | 2022-02-08 |
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| CN202111219411.6A Pending CN114024042A (en) | 2021-10-20 | 2021-10-20 | Preparation method of multi-tab lithium battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114843442A (en) * | 2022-07-04 | 2022-08-02 | 宁德新能源科技有限公司 | Electrochemical device and electronic apparatus |
| CN116053605A (en) * | 2022-11-21 | 2023-05-02 | 江苏正力新能电池技术有限公司 | Battery cell, battery cell preparation method and lithium battery |
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