CN114552024A - Lithium ion battery lamination structure and preparation thereof, battery core and preparation and application thereof - Google Patents
Lithium ion battery lamination structure and preparation thereof, battery core and preparation and application thereof Download PDFInfo
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- CN114552024A CN114552024A CN202210104332.9A CN202210104332A CN114552024A CN 114552024 A CN114552024 A CN 114552024A CN 202210104332 A CN202210104332 A CN 202210104332A CN 114552024 A CN114552024 A CN 114552024A
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- pole piece
- lithium ion
- ion battery
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 50
- 238000003475 lamination Methods 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 103
- 238000002955 isolation Methods 0.000 claims abstract description 29
- 239000012528 membrane Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000005520 cutting process Methods 0.000 claims abstract description 15
- 238000004804 winding Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000012805 post-processing Methods 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 8
- 238000007789 sealing Methods 0.000 description 8
- 230000032683 aging Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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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
-
- 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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery lamination structure and preparation thereof, a battery core and preparation and application thereof. The method comprises the following steps of cutting a composite pole piece belt A and a composite pole piece belt B which are composed of a positive pole piece, a negative pole piece and an isolating membrane to obtain a single composite pole piece unit A and a single composite pole piece unit B; then placing the single composite pole piece unit B on the upper layer of the single composite pole piece unit A, and repeatedly stacking for a plurality of times to obtain a composite pole piece unit C; finally, placing a layer of isolating membrane on the positive pole piece on the uppermost layer of the composite pole piece C, and then placing a negative pole piece to obtain a lithium ion battery lamination structure; subsequently, winding the lithium ion battery along a laminated structure of the lithium ion battery by using an isolation film, and performing post-treatment to form a battery cell; and further preparing the lithium ion battery by using the battery cell. Compared with the prior art, the production efficiency of the lithium ion battery lamination is greatly improved.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery lamination structure and preparation thereof, a battery core and preparation and application thereof.
Background
The lithium ion battery is manufactured by the processes of pulping, coating, rolling, die cutting and slitting, and then is manufactured into the battery cell, and two methods, namely winding and laminating, are generally adopted. Winding, namely winding the die-cut positive and negative pole pieces and the isolating film on a winding core for a fixed length, and taking out the wound battery cell by using a winding needle to form a battery cell; the lamination means that the positive and negative pole pieces which are subjected to die cutting and cutting are sequentially and alternately stacked on the isolating membrane to finally form a square battery cell.
The lamination method has two methods, one is Z-shaped lamination, namely positive and negative pole pieces are alternately stacked on an isolating membrane back and forth to form a battery cell; the other method is composite lamination, namely, the positive and negative pole pieces are firstly compounded with the isolating membrane, and then the compounded pole pieces are laminated to form the battery core. The folding frequency of the Z-shaped lamination process is high, the isolating membrane and the positive and negative pole pieces are easy to be dislocated, and the yield of the battery cell is low; the composite lamination requires a plurality of single composite units to be stacked, and the production efficiency of the battery core is low.
Disclosure of Invention
In order to solve the above problems, the present invention provides a lithium ion battery lamination structure and a preparation thereof, a battery cell and a preparation and application thereof. The method comprises the following steps of cutting a composite pole piece belt A and a composite pole piece belt B which are composed of a positive pole piece, a negative pole piece and an isolating membrane to obtain a single composite pole piece unit A and a single composite pole piece unit B; then placing the single composite pole piece unit B on the upper layer of the single composite pole piece unit A, and repeatedly stacking for a plurality of times to obtain a composite pole piece unit C; finally, placing a layer of isolating membrane on the positive pole piece on the uppermost layer of the composite pole piece C, and then placing a negative pole piece to obtain a lithium ion battery lamination structure; subsequently, winding the lithium ion battery along a laminated structure of the lithium ion battery by using an isolation film, and performing post-treatment to form a battery cell; and further preparing the lithium ion battery by using the battery cell. Compared with the prior art, the production efficiency of the lithium ion battery lamination is greatly improved.
The purpose of the invention can be realized by the following technical scheme:
the invention aims to provide a preparation method of a lithium ion battery lamination structure, which comprises the following steps:
(1) cutting a composite pole piece belt A consisting of a positive pole piece, a negative pole piece and an isolating membrane to obtain a single composite pole piece unit A;
(2) cutting a composite pole piece belt B consisting of a positive pole piece, a negative pole piece and an isolating membrane to obtain a single composite pole piece unit B;
(3) placing the single composite pole piece unit B obtained in the step (2) on the upper layer of the single composite pole piece unit A obtained in the step (1), and repeatedly stacking for a plurality of times to obtain a composite pole piece unit C;
(4) and (3) placing a layer of isolating membrane on the positive pole piece on the uppermost layer of the composite pole piece C, and then placing a negative pole piece to obtain the lithium ion battery lamination structure.
In one embodiment of the present invention, in step (1), the composite electrode strip a sequentially includes, from bottom to top, an isolation film, a negative electrode plate, an isolation film, a positive electrode plate, an isolation film, and a negative electrode plate.
In an embodiment of the present invention, in the step (2), the composite electrode strip B sequentially includes, from bottom to top, an isolation film, a positive electrode plate, an isolation film, a negative electrode plate, an isolation film, and a positive electrode plate.
In one embodiment of the present invention, the single composite pole piece unit a and the single composite pole piece unit B are the same size.
In one embodiment of the present invention, in the step (3), in the composite pole piece unit C, the number of the single composite pole piece unit a and the number of the single composite pole piece unit B are equal.
In an embodiment of the present invention, in the composite pole piece unit C, all the positive pole pieces and the negative pole pieces are aligned at the center, and the adjacent positive pole pieces and the adjacent negative pole pieces are spaced at the same distance.
The second purpose of the invention is to provide a lithium ion battery lamination prepared by the method.
The third purpose of the invention is to provide a preparation method of the battery cell, which comprises the following steps: and winding the isolating membrane along the lithium ion battery lamination structure, and performing post-treatment to form the battery core.
A fourth object of the present invention is to provide a battery cell prepared by the above method.
The fifth purpose of the invention is to provide an application of the battery cell in the preparation of a lithium ion battery.
Compared with the prior art, the invention has the following beneficial effects:
in the battery core lamination process, a composite technology is used, the positive pole piece, the negative pole piece and the isolating membrane form two different composite pole piece belts, the dislocation problem between the positive pole piece and the negative pole piece is reduced, and then cutting is carried out to form two composite units; the two composite unit pole pieces are sequentially stacked, then an isolating membrane and a negative pole piece are placed on the topmost layer, and the battery cell is formed by gluing after tail winding is completed. In conclusion, the invention can effectively shorten the lamination time of the lithium ion battery and greatly improve the production efficiency.
Drawings
FIG. 1 is a schematic representation of two composite pole piece tapes;
FIG. 2 is a schematic view of two composite pole piece strips after cutting and a single composite unit;
FIG. 3 is a schematic diagram of two composite pole piece unit stacks;
FIG. 4 is a schematic view of the placement of the ending barrier film and the negative electrode sheet after stacking;
fig. 5 is a schematic diagram of a cell after finalization;
reference numbers in the figures: 1. a composite pole piece band A; 11. a negative pole piece; 12. a positive electrode plate; 13. an isolation film; 2. A composite pole piece band B; 3. a single composite pole piece unit A; 4. and a single composite pole piece unit B.
Detailed Description
The invention provides a preparation method of a lithium ion battery lamination structure, which comprises the following steps:
(1) cutting a composite pole piece belt A consisting of a positive pole piece, a negative pole piece and an isolating membrane to obtain a single composite pole piece unit A;
(2) cutting a composite pole piece belt B consisting of a positive pole piece, a negative pole piece and an isolating membrane to obtain a single composite pole piece unit B;
(3) placing the single composite pole piece unit B obtained in the step (2) on the upper layer of the single composite pole piece unit A obtained in the step (1), and repeatedly stacking for a plurality of times to obtain a composite pole piece unit C;
(4) and (3) placing a layer of isolating membrane on the positive pole piece on the uppermost layer of the composite pole piece C, and then placing a negative pole piece to obtain the lithium ion battery lamination structure.
In one embodiment of the present invention, in step (1), the composite electrode strip a sequentially includes, from bottom to top, an isolation film, a negative electrode plate, an isolation film, a positive electrode plate, an isolation film, and a negative electrode plate.
In an embodiment of the present invention, in the step (2), the composite electrode strip B sequentially includes, from bottom to top, an isolation film, a positive electrode plate, an isolation film, a negative electrode plate, an isolation film, and a positive electrode plate.
In one embodiment of the present invention, the single composite pole piece unit a and the single composite pole piece unit B are the same size.
In one embodiment of the present invention, in the step (3), in the composite pole piece unit C, the number of the single composite pole piece unit a and the number of the single composite pole piece unit B are equal.
In an embodiment of the present invention, in the composite pole piece unit C, all the positive pole pieces and the negative pole pieces are aligned at the center, and the adjacent positive pole pieces and the adjacent negative pole pieces are spaced at the same distance.
The invention provides a lithium ion battery lamination prepared by the method.
The invention provides a preparation method of a battery cell, which comprises the following steps: and winding the isolating membrane along the lithium ion battery lamination structure, and performing post-treatment to form the battery core.
The invention provides a battery cell prepared by the method.
The invention provides an application of the battery cell in the preparation of a lithium ion battery.
The invention is described in detail below with reference to the figures and specific embodiments.
In the following examples and comparative examples, materials used are commercially available unless otherwise specified; the preparation means, the detection means and the characterization means of the lithium ion battery are all conventional means in the field.
Example 1
The embodiment provides a battery cell of a lithium ion battery.
As shown in fig. 1 to 5, the composite electrode strip a1 is composed of a positive electrode sheet 12, two negative electrode sheets 11 and three parallel separators 13, wherein the negative electrode sheet 11 is placed on the lowermost separator 13 at an equal distance, the separator 13 is placed on the negative electrode sheet 11, the positive electrode sheet 12 is placed on the separator 13 at an equal distance, the positive electrode sheet 12 is aligned with the center of the lower negative electrode sheet 13, the separator 13 is placed on the positive electrode sheet 12, the negative electrode sheet 11 is placed on the separator 13 at an equal distance, and the negative electrode sheet 11 is aligned with the center of the lower positive electrode sheet 12.
The composite pole piece belt B2 is composed of a negative pole piece 11, two positive pole pieces 12 and three layers of parallel isolation films 13, wherein the negative pole piece 12 is arranged on the isolation film 13 at the bottommost layer at equal intervals, the isolation film 13 is arranged on the positive pole piece 12, the negative pole piece 11 is arranged on the isolation film 13 at equal intervals, the negative pole piece 11 is aligned with the center of the positive pole piece 12 at the lower layer, the isolation film 13 is arranged on the negative pole piece 11, the positive pole piece 12 is arranged on the isolation film 13 at equal intervals, and the positive pole piece 12 is aligned with the center of the negative pole piece 11 at the lower layer.
The composite pole piece tape a1 is cut to form single composite pole piece units A3, each single composite pole piece unit A3 being of equal width (95 mm in width and 220mm in length).
The composite pole piece strip B2 is cut to form single composite pole piece units B4, each single composite pole piece unit B4 having the same width (95 mm in width and 220mm in length).
And (3) sequentially stacking the single composite pole piece unit A3 and the single composite pole piece unit B4 for 30 times to obtain a composite pole piece unit C, wherein the single composite pole piece unit A3 and the single composite pole piece unit B4 need to be aligned in the center, and the alignment degree is ensured.
And placing a layer of isolating film 13 on the top of the composite pole piece unit C, and then placing a layer of negative pole piece 11 on the isolating film, wherein the negative pole piece 11 and the composite pole piece unit C need to be aligned in the center, so that the alignment degree is ensured.
And winding the isolating membrane 13 around the composite pole piece unit C for one and a half circles to form the lithium ion battery cell.
Example 2
The embodiment provides a lithium ion battery, which comprises the battery cell.
And (2) carrying out tab welding, top sealing, side sealing, liquid injection and pre-sealing on the basis of the lithium ion battery cell prepared in the embodiment 1, and finally carrying out standing aging, hot cold pressing, formation and secondary sealing to obtain the lithium ion battery.
Comparative example 1
The present comparative example provides a cell for a lithium ion battery.
And placing the positive and negative pole pieces which are subjected to die cutting and cut on two layers of isolating films with glue to form a composite pole piece belt. The bottommost part of the composite pole piece belt is provided with an isolation film 13, a layer of anode pole pieces 12 with equal intervals is placed on the isolation film 13 at the bottommost layer, then a layer of isolation film 13 is placed on the anode pole pieces 12, and then a layer of cathode pole pieces 11 with equal intervals is placed on the isolation film 13, so that the composite pole piece belt is manufactured.
The positive pole piece 12 and the negative pole piece 11 are aligned in the center during compounding.
Cutting the composite pole piece belt to form a single composite pole piece unit (the width is 95mm, and the length is 220 mm);
firstly, placing a layer of isolating membrane 13 on a lamination station, placing a layer of negative pole piece 11 on the isolating membrane 13, and then stacking the composite unit on the negative pole piece 11 for 45 times to form a composite unit pole piece structure;
and then, winding the bottom layer isolation film 13 around the composite unit pole piece structure for a circle and a half to form the lithium ion battery cell.
Comparative example 2
The comparative example provides a lithium ion battery comprising the above cell.
And (3) carrying out tab welding, top sealing, side sealing, liquid injection and pre-sealing on the basis of the lithium ion battery cell prepared in the comparative example 1, and finally carrying out standing aging, hot cold pressing, formation and secondary sealing to obtain the lithium ion battery.
The time taken for the lamination process of the lithium ion batteries prepared in example 1 and comparative example 1 is shown in table 1.
Table 1 summary table of time consumed by lamination process of lithium ion battery
As can be seen from table 1, for the lithium ion battery cells composed of the same number of positive and negative electrode plates, the stacking times and the total time after completion of example 1 are lower than those of comparative example 1, which indicates that the lamination time can be effectively shortened and the production efficiency can be improved by using the lamination structure and the process method of the lithium ion battery in example 1.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above.
Claims (10)
1. The preparation method of the lithium ion battery lamination structure is characterized by comprising the following steps:
(1) cutting a composite pole piece belt A consisting of a positive pole piece, a negative pole piece and an isolating membrane to obtain a single composite pole piece unit A;
(2) cutting a composite pole piece belt B consisting of a positive pole piece, a negative pole piece and an isolating membrane to obtain a single composite pole piece unit B;
(3) placing the single composite pole piece unit B obtained in the step (2) on the upper layer of the single composite pole piece unit A obtained in the step (1), and repeatedly stacking for a plurality of times to obtain a composite pole piece unit C;
(4) and (3) placing a layer of isolating membrane on the positive pole piece on the uppermost layer of the composite pole piece C, and then placing a negative pole piece to obtain the lithium ion battery lamination structure.
2. The preparation method of the lamination structure of the lithium ion battery according to claim 1, wherein in the step (1), the composite electrode strip A is sequentially composed of an isolation film, a negative electrode plate, an isolation film, a positive electrode plate, an isolation film and a negative electrode plate from bottom to top.
3. The method according to claim 1, wherein in the step (2), the composite electrode sheet strip B is sequentially formed by an isolating film, a positive electrode sheet, an isolating film, a negative electrode sheet, an isolating film and a positive electrode sheet from bottom to top.
4. The method according to claim 1, wherein the single composite pole piece unit A and the single composite pole piece unit B have the same size.
5. The method according to claim 1, wherein in the step (3), the number of the single composite pole piece units A and the number of the single composite pole piece units B in the composite pole piece units C are equal.
6. The method according to claim 5, wherein in the composite pole piece unit C, all the positive pole pieces and the negative pole pieces are aligned at the center, and the adjacent positive pole pieces and the adjacent negative pole pieces are spaced at equal intervals.
7. A lithium ion battery lamination prepared by the method of any one of claims 1-6.
8. The preparation method of the battery cell is characterized by comprising the following steps: winding a separator along the lithium ion battery lamination of claim 7, and post-processing to form a cell.
9. A cell prepared by the method of claim 8.
10. Use of the cell of claim 9 in the manufacture of a lithium ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210104332.9A CN114552024A (en) | 2022-01-28 | 2022-01-28 | Lithium ion battery lamination structure and preparation thereof, battery core and preparation and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210104332.9A CN114552024A (en) | 2022-01-28 | 2022-01-28 | Lithium ion battery lamination structure and preparation thereof, battery core and preparation and application thereof |
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| CN114552024A true CN114552024A (en) | 2022-05-27 |
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| CN202210104332.9A Pending CN114552024A (en) | 2022-01-28 | 2022-01-28 | Lithium ion battery lamination structure and preparation thereof, battery core and preparation and application thereof |
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|---|---|---|---|---|
| CN104681878A (en) * | 2015-03-17 | 2015-06-03 | 王文斌 | Manufacturing method of winding type lithium ion battery and winding type lithium ion battery |
| CN107946626A (en) * | 2017-10-16 | 2018-04-20 | 中航锂电技术研究院有限公司 | Pole piece unit and its manufacture method, battery core and its manufacture method, battery |
| CN207781749U (en) * | 2017-12-29 | 2018-08-28 | 长城汽车股份有限公司 | The electrode tinkertoy module and electrochemical appliance of electrochemical appliance |
| CN208062197U (en) * | 2017-12-29 | 2018-11-06 | 长城汽车股份有限公司 | The electrode tinkertoy module and electrochemical appliance of electrochemical appliance |
| CN109560322A (en) * | 2017-12-29 | 2019-04-02 | 蜂巢能源科技有限公司 | The manufacturing method and electrode tinkertoy module of electrode tinkertoy module |
| CN210535776U (en) * | 2019-10-14 | 2020-05-15 | 郑州中科新兴产业技术研究院 | Laminated lithium ion battery |
| WO2021008554A1 (en) * | 2019-07-16 | 2021-01-21 | 蜂巢能源科技有限公司 | Die-cutting lamination system and method |
-
2022
- 2022-01-28 CN CN202210104332.9A patent/CN114552024A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104681878A (en) * | 2015-03-17 | 2015-06-03 | 王文斌 | Manufacturing method of winding type lithium ion battery and winding type lithium ion battery |
| CN107946626A (en) * | 2017-10-16 | 2018-04-20 | 中航锂电技术研究院有限公司 | Pole piece unit and its manufacture method, battery core and its manufacture method, battery |
| CN207781749U (en) * | 2017-12-29 | 2018-08-28 | 长城汽车股份有限公司 | The electrode tinkertoy module and electrochemical appliance of electrochemical appliance |
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| WO2021008554A1 (en) * | 2019-07-16 | 2021-01-21 | 蜂巢能源科技有限公司 | Die-cutting lamination system and method |
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Application publication date: 20220527 |