CN112615062B - High-energy-density laminated lithium ion battery pole group, manufacturing method thereof and battery - Google Patents
High-energy-density laminated lithium ion battery pole group, manufacturing method thereof and battery Download PDFInfo
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- CN112615062B CN112615062B CN202011512470.8A CN202011512470A CN112615062B CN 112615062 B CN112615062 B CN 112615062B CN 202011512470 A CN202011512470 A CN 202011512470A CN 112615062 B CN112615062 B CN 112615062B
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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
- H01M10/0585—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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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 the field of lithium ion battery manufacturing, in particular to a high-energy-density laminated lithium ion battery pole group, a manufacturing method thereof and a battery, wherein the battery pole group comprises a top layer single-sided positive pole piece, a double-sided negative pole piece, a double-sided positive pole piece, a diaphragm and a bottom layer single-sided positive pole piece; the pole group provided by the invention is provided with the bottom layer single-sided positive pole piece and the top layer single-sided positive pole piece, the double-sided positive pole piece and the composite sheet are alternately laminated, and then the double-sided positive pole piece and the composite sheet are laminated with the top layer single-sided positive pole piece and the bottom layer single-sided positive pole piece.
Description
Technical Field
The invention relates to the field of lithium ion battery manufacturing, in particular to a high-energy-density laminated lithium ion battery pole group, a manufacturing method thereof and a battery.
Background
The manufacturing method of the lithium ion battery mainly comprises a winding type and a laminated type, wherein the winding type is to wind a long-strip-shaped positive plate, a long-strip-shaped negative plate and a long-strip-shaped diaphragm into a winding core through winding equipment, and prepare the battery through the subsequent procedures of packaging, liquid injection, formation and the like, and the laminated type is to mainly stack the positive plate, the negative plate and the diaphragm of one plate together to form a pole group and prepare the battery through the subsequent procedures of packaging, liquid injection, formation and the like. With the thinning of electronic devices such as smart phones and wearable devices, the design requirements for internal electronic components are higher and higher, and the space reserved for batteries is smaller and smaller. Because different shapes can not be made into to the coiling type battery, different shapes can be made into to the lamination type battery as required, so lamination type battery range of application is wider. Based on the fact that the two outermost negative plates of the existing battery cell are provided with negative slurry on two sides, the energy density is low, and Chinese patent application with application publication number CN 108023117A provides a high-energy-density lithium ion battery and a manufacturing method thereof. The outermost negative plate of the battery core of the high-energy-density lithium ion battery is the negative plate with the negative slurry arranged on the single surface, and the outermost negative plate of the existing battery core is the negative plate with the negative slurry arranged on the double surfaces, so that the quality of the battery core is smaller than that of the existing battery core, the capacity of the battery is unchanged, and the energy density is the capacity divided by the quality, so that the energy density is improved, and the cost is lower. However, the negative pole piece in the technical scheme is difficult to process, and the highest energy density is only 192.19Wh/kg. In addition, the existing laminated pole group mostly adopts a zigzag lamination mode, and the positive pole piece, the negative pole piece and the diaphragm are laminated to a certain number of layers according to the zigzag mode. When the lamination is performed by adopting the zigzag lamination process, due to the existence of the membrane, the membrane is easily folded in the lamination process, and safety accidents can be caused.
Disclosure of Invention
Aiming at the problems of low energy density and low safety of the traditional laminated lithium ion battery pole group, the invention provides a high-energy-density laminated lithium ion battery pole group, a manufacturing method thereof and a battery, which can greatly improve the energy density, the safety performance and the service life of the battery.
One of the purposes of the invention is to provide a high-energy-density laminated lithium ion battery electrode group, which comprises a top layer single-sided positive electrode plate, a double-sided negative electrode plate, a double-sided positive electrode plate, a diaphragm and a bottom layer single-sided positive electrode plate.
The arrangement mode of each layer of the battery pole group is as follows: the positive electrode comprises a top layer single-sided positive electrode piece, a diaphragm, a double-sided negative electrode piece, a diaphragm, n (the double-sided positive electrode piece, the diaphragm, the double-sided negative electrode piece and the diaphragm) and a bottom layer single-sided positive electrode piece, wherein n represents the repetition frequency, is not less than 0 and is an integer.
Another object of the present invention is to provide a method for manufacturing a high energy density laminated lithium ion battery electrode assembly, comprising the steps of:
(1) Composite sheet made of double-sided negative pole piece and diaphragm
(1) Taking a double-sided negative pole piece on a material placing station and placing the double-sided negative pole piece on a pole piece positioning station;
(2) unreeling the upper and lower diaphragm unreeling belts: the lower diaphragm unwinding belt moves to a single-side pre-pressing station, the upper diaphragm and the lower diaphragm continue to move to a double-side compounding station, the upper diaphragm and the lower diaphragm are aligned up and down, and double-side negative pole pieces are wrapped inside the upper diaphragm and the lower diaphragm;
(3) after compounding the negative pole piece and the diaphragm, moving to a special-shaped edge cutting station for cutting;
(4) continuing to operate to a cutting station after cutting in the step (3) to obtain a composite sheet;
(5) the receiving station receives the single composite sheet to a receiving box to complete the manufacture of the composite sheet;
(2) Manufacture of battery pole group
(1) Placing the single-piece composite sheet, the top layer single-sided positive pole piece, the double-sided positive pole piece and the bottom layer single-sided positive pole piece in matched material boxes;
(2) setting layer number parameters, namely n values, according to design requirements of different pole groups;
(3) individual pole stack laminations:
placing the bottom layer single-sided positive pole piece on a positive pole positioning station for positioning, and then placing the positioned bottom layer single-sided positive pole piece on a lamination station;
placing the composite sheet on a composite sheet positioning station for positioning, and then placing the positioned composite sheet on a lamination station on a single-sided anode pole piece at the bottom layer;
placing the double-sided positive pole piece on a positive pole positioning station for positioning, and then placing the positioned double-sided positive pole piece on a lamination station on a composite sheet;
placing the composite sheet on a composite sheet positioning station for positioning, and then placing the positioned composite sheet on a laminating station on a double-sided positive pole piece;
alternately laminating the double-sided positive pole piece and the composite sheet until the number of layers is set, and stopping laminating;
placing the top layer single-sided positive pole piece on a positive pole piece station, and then placing the positioned top layer single-sided positive pole piece on a lamination station, so that the lamination of a single pole group is completed;
(4) and (4) allowing the single pole group obtained in the step (3) to enter a pre-pressing station for pre-pressing, and then entering a hot-pressing station for hot-pressing to complete the pole group manufacturing.
Preferably, the positioning station is a CCD image automatic positioning platform. The positioning accuracy is high, and the model change is convenient.
Preferably, the upper and lower diaphragm unwinding tape is a diaphragm with a double-sided glued diaphragm and a ceramic layer or a boehmite layer. The glue layer is favorable for being compounded with the pole piece, and the ceramic layer or the boehmite layer is favorable for improving the safety performance of the finished battery.
Preferably, the special-shaped edge cutting station is provided with a hot cutter, the hot cutter is one of a beryllium copper cutter or a brass cutter, and the hot cutter is further preferably a beryllium copper cutter. And cutting the square strip-shaped diaphragm to a required special-shaped size so as to facilitate the assembly of a follow-up pole into a shell and packaging. The beryllium copper knife has high hardness, good heat transfer and abrasion resistance.
The invention also provides a battery, which comprises the battery pole group.
The invention has the beneficial effects that,
(1) The electrode group provided by the invention is provided with a bottom layer single-sided positive electrode piece and a top layer single-sided positive electrode piece, the double-sided positive electrode piece and the composite sheet are alternately laminated, and then the laminated sheet is laminated with the top layer single-sided positive electrode piece and the bottom layer single-sided positive electrode piece;
(2) In the pole group manufacturing method provided by the invention, the beryllium copper knife or the brass knife is adopted at the special-shaped edge cutting station, so that the cost is low, dust can be effectively avoided, the number of layers of the pole group is not limited, the problem of laser foreign technology monopoly existing in integral laser trimming after the traditional special-shaped battery lamination is finished is greatly improved, and the problems of potential safety hazard and excessive and continuous layers caused by dust introduced by laser cutting are also avoided;
(3) Adopt the mode of pre-compaction reheat to finalize the design behind the utmost point group lamination, compare in the sticky tape bundling formula of traditional lamination, there is not mixed and disorderly adhesive tape impression after the battery shaping of manufacturing, and the battery is more pleasing to the eye, and battery hardness is high moreover, is favorable to improving the life of battery.
Drawings
FIG. 1 is a schematic view of a pole set structure provided by the present invention;
FIG. 2 is a schematic view of composite sheet fabrication;
in the figure, 1, a top layer single-sided positive pole piece; 2. a double-sided negative pole piece; 3. a double-sided positive pole piece; 4. a diaphragm; 5. a bottom single-sided positive pole piece; 6. a material placing station; 7. positioning a station; 8. winding the upper diaphragm; 9. unwinding the tape from the lower diaphragm; 10. a single-side prepressing station; 11. a double-sided compounding station; 12. a special-shaped edge cutting station; 13. cutting off a station; 14. and a material receiving station.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A high energy density laminated lithium ion battery pole group comprises a top layer single-sided positive pole piece 1, a double-sided negative pole piece 2, a double-sided positive pole piece 3, a diaphragm 4 and a bottom layer single-sided positive pole piece 5;
referring to fig. 1, the arrangement of each layer of the battery pole group is as follows: the positive electrode comprises a top layer single-sided positive electrode piece, a diaphragm, a double-sided negative electrode piece, a diaphragm, n (double-sided positive electrode piece, diaphragm, double-sided negative electrode piece, diaphragm) and a bottom layer single-sided positive electrode piece, wherein n =12.
A method for manufacturing a high energy density laminated lithium ion battery pole group comprises the following steps:
(1) Composite sheet made of double-sided negative pole piece and diaphragm
(1) Placing a double-sided negative pole piece which is die-cut into a designed shape and placed in a corresponding material box in a material placing station 6, and taking a negative pole piece by a mechanical arm and placing the negative pole piece in a pole piece positioning station 7; the positioning station is a CCD image automatic positioning platform, the positioning precision is high, and the model change is convenient;
(2) unreeling the upper and lower diaphragm unreeling belts: the upper and lower diaphragm unreeling belts are drawn by the rear end to be unreeled through the transition rollers, the lower diaphragm forms a plane capable of bearing the double-sided negative electrode plate, and the upper and lower diaphragm unreeling belts are diaphragms with double-sided glue-coated diaphragms and ceramic layers or boehmite layers. The adhesive layer is favorable for being compounded with the pole piece, and the ceramic layer or the boehmite layer is favorable for improving the safety performance of the finished battery; the lower diaphragm unwinding belt 9 runs to a single-side pre-pressing station 10, the upper diaphragm unwinding belt 8 and the lower diaphragm unwinding belt 9 continue to run to a double-side compounding station 11, the upper diaphragm and the lower diaphragm are aligned up and down, and double-side negative pole pieces are wrapped inside the upper diaphragm and the lower diaphragm;
(3) after being compounded with a negative pole piece and a diaphragm, the negative pole piece and the diaphragm move to a special-shaped edge cutting station 12 for cutting, a hot cutter suitable for cutting the special-shaped edge is arranged at the station according to the requirement of the special-shaped edge, and the square strip diaphragm can be cut to the special-shaped size required by design after being positioned by an inductor so as to facilitate the assembly of a subsequent pole into a shell and packaging; if a square laminate cell is being produced, the station may be shielded. The preferred hot cutter is a beryllium copper cutter, and has the characteristics of high hardness, good heat transfer and wear resistance; the second time is a brass knife;
(4) after cutting in the step (3), continuously running to a cutting station 13 to obtain a composite sheet;
(5) a material receiving station 14 receives the single composite sheet to a material receiving box to finish the manufacture of the composite sheet;
(2) Manufacture of battery pole group
(1) Placing the single-piece composite sheet, the top layer single-sided positive pole piece, the double-sided positive pole piece and the bottom layer single-sided positive pole piece in matched material boxes;
(2) setting a layer number parameter according to the design requirements of different pole groups, namely n =12;
(3) individual pole stack laminations:
placing the single-sided positive pole piece of the bottom layer on a positive pole positioning station for positioning, and then placing the positioned single-sided positive pole piece of the bottom layer on a laminating station;
placing the composite sheet on a composite sheet positioning station for positioning, and then placing the positioned composite sheet on a lamination station on a single-sided anode pole piece at the bottom layer;
placing the double-sided positive pole piece on a positive pole positioning station for positioning, and then placing the positioned double-sided positive pole piece on a lamination station on a composite sheet;
placing the composite sheet on a composite sheet positioning station for positioning, and then placing the positioned composite sheet on a laminating station on a double-sided positive pole piece;
alternately laminating the double-sided positive pole piece and the composite sheet until the number of layers is set, and stopping laminating;
placing the top layer single-sided positive pole piece on a positive pole piece station, and then placing the positioned top layer single-sided positive pole piece on a lamination station, so that the lamination of a single pole group is completed;
(4) and (4) allowing the single pole group obtained in the step (3) to enter a pre-pressing station for pre-pressing, and then entering a hot-pressing station for hot-pressing to complete the pole group manufacturing.
After the electrode group is manufactured, the high-energy-density laminated lithium ion battery is manufactured through a series of battery manufacturing steps of welding positive and negative electrode tabs, entering a shell, packaging, injecting liquid, forming, grading, packaging and the like, and the energy density is 724.49Wh/L through detection of a lithium battery grading cabinet.
Example 2
The difference compared to example 1 is that n =13.
After the electrode group is manufactured, high-energy-density laminated lithium ion batteries with different shapes are manufactured through a series of battery manufacturing steps of welding positive and negative electrode tabs, putting into a shell, packaging, injecting liquid, forming, grading, packaging and the like, and the energy density is 732.12Wh/L through detection of a lithium battery grading cabinet.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions should be within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure and the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The manufacturing method of the high-energy-density laminated lithium ion battery pole group is characterized by comprising a top layer single-sided positive pole piece (1), a double-sided negative pole piece (2), a double-sided positive pole piece (3), a diaphragm (4) and a bottom layer single-sided positive pole piece (5), and comprises the following steps:
s1, preparing a composite sheet from a double-sided negative pole piece and a diaphragm
(1) The double-sided negative pole piece on the material taking and placing station (6) is placed on the pole piece positioning station (7);
(2) unreeling the upper and lower diaphragm unreeling belts: the lower diaphragm unwinding tape (9) runs to a single-side pre-pressing station (10), the lower diaphragm unwinding tape (9) and the upper diaphragm unwinding tape (8) continue to run to a double-side compounding station (11), the upper diaphragm and the lower diaphragm are aligned up and down, and double-side negative pole pieces are wrapped inside the upper diaphragm and the lower diaphragm;
(3) after being compounded with the diaphragm, the negative pole piece moves to a special-shaped edge cutting station (12) for cutting;
(4) after cutting in the step (3), continuously operating to a cutting station (13) to obtain a composite sheet;
(5) a material receiving station (14) receives the single composite sheet to a material receiving box to complete the manufacture of the composite sheet;
wherein the special-shaped edge cutting station is provided with a hot cutter which is one of a beryllium copper cutter or a brass cutter;
s2, manufacturing a battery pole group
(1) Placing the composite sheet, the top single-sided positive pole piece, the double-sided positive pole piece and the bottom single-sided positive pole piece in matched material boxes;
(2) setting layer number parameters of the composite sheet and the double-sided positive pole piece according to the design requirements of different pole groups, namely n value;
(3) individual pole stack laminations:
placing the bottom layer single-sided positive pole piece on a positive pole positioning station for positioning, and then placing the positioned bottom layer single-sided positive pole piece on a lamination station;
placing the composite sheet on a composite sheet positioning station for positioning, and then placing the positioned composite sheet on a lamination station on a single-sided anode pole piece at the bottom layer;
placing the double-sided positive pole piece on a positive pole positioning station for positioning, and then placing the positioned double-sided positive pole piece on a lamination station on a composite sheet;
placing the composite sheet on a composite sheet positioning station for positioning, and then placing the positioned composite sheet on a lamination station on a double-sided positive pole piece;
alternately laminating the double-sided positive pole piece and the composite sheet until the number of layers is set, and stopping laminating;
placing the top layer single-sided positive pole piece on a positive pole piece station, and then placing the positioned top layer single-sided positive pole piece on a lamination station, so that the lamination of a single pole group is completed;
(4) and (4) the single pole group obtained in the step (3) enters a pre-pressing station for pre-pressing, and then enters a hot-pressing station for hot-pressing, so that the pole group is manufactured.
2. The method of claim 1, wherein the positioning station is a CCD imaging automatic positioning stage.
3. A method of manufacture according to claim 1, wherein the upper and lower membrane release tape is a double-sided rubberized membrane plus a ceramic or boehmite layer.
4. A high energy density laminated lithium ion battery electrode pack made according to the method of manufacture of claim 1.
5. A battery comprising the high energy density laminated lithium ion battery electrode assembly of claim 4.
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| CN202050025U (en) * | 2011-01-10 | 2011-11-23 | 惠州市德赛聚能电池有限公司 | Laminated lithium battery |
| CN108390101A (en) * | 2018-01-03 | 2018-08-10 | 多氟多（焦作）新能源科技有限公司 | A kind of lithium ion battery cell and preparation method thereof, lithium ion battery |
| CN109244554A (en) * | 2018-09-21 | 2019-01-18 | 江苏卡耐新能源有限公司 | A kind of lithium ion battery zigzag laminating equipment and its technique |
| CN109921099A (en) * | 2019-02-26 | 2019-06-21 | 深圳吉阳智能科技有限公司 | A kind of laminating equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050072540A1 (en) * | 2003-09-12 | 2005-04-07 | Ehv-Weidmann Industries Inc. | System and method for creping electrical insulating paper |
| CN108023117A (en) * | 2017-11-30 | 2018-05-11 | 北京国能电池科技有限公司 | Lithium ion battery of high-energy-density and preparation method thereof |
| CN108682895B (en) * | 2018-04-10 | 2020-06-12 | 东莞塔菲尔新能源科技有限公司 | Manufacturing process of lithium ion battery cell |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202050025U (en) * | 2011-01-10 | 2011-11-23 | 惠州市德赛聚能电池有限公司 | Laminated lithium battery |
| CN108390101A (en) * | 2018-01-03 | 2018-08-10 | 多氟多（焦作）新能源科技有限公司 | A kind of lithium ion battery cell and preparation method thereof, lithium ion battery |
| CN109244554A (en) * | 2018-09-21 | 2019-01-18 | 江苏卡耐新能源有限公司 | A kind of lithium ion battery zigzag laminating equipment and its technique |
| CN109921099A (en) * | 2019-02-26 | 2019-06-21 | 深圳吉阳智能科技有限公司 | A kind of laminating equipment |
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