CN114050324A - Multi-tab battery cell winding process, multi-tab battery cell, battery and electronic product - Google Patents
Multi-tab battery cell winding process, multi-tab battery cell, battery and electronic product Download PDFInfo
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- CN114050324A CN114050324A CN202111216678.XA CN202111216678A CN114050324A CN 114050324 A CN114050324 A CN 114050324A CN 202111216678 A CN202111216678 A CN 202111216678A CN 114050324 A CN114050324 A CN 114050324A
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- 238000004804 winding Methods 0.000 title claims abstract description 86
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical compound [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005520 cutting process Methods 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000002002 slurry Substances 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052744 lithium Inorganic materials 0.000 abstract description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 10
- 229910001416 lithium ion Inorganic materials 0.000 description 10
- -1 polyethylene Polymers 0.000 description 4
- 238000003698 laser cutting Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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Classifications
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention belongs to the technical field of lithium batteries, and particularly discloses a multi-tab battery cell winding process, a multi-tab battery cell, a battery and an electronic product, wherein the multi-tab battery cell winding process comprises the following steps: s1, determining the size and the margin of the pole piece; s2, respectively winding the plurality of pole pieces obtained after stirring, coating, rolling, pre-slitting and central slitting into a plurality of winding cores, cutting according to the size and the edge distance of the positive pole piece to obtain a first winding core, and cutting according to the size and the edge distance of the negative pole piece to obtain a second winding core; s3, disassembling the first winding core and the second winding core to obtain a first positive plate and a first negative plate; and S4, winding the first positive plate, the first negative plate and the diaphragm to obtain the multi-tab battery cell. The multi-tab battery cell winding process provided by the invention solves the problem of poor dislocation stability during winding of the multi-tab battery cell, greatly shortens the winding debugging time, improves the production efficiency, and ensures the safety performance of the battery cell.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a multi-tab battery cell winding process, a multi-tab battery cell, a battery and an electronic product.
Background
The lithium ion battery has the advantages of light weight, high specific power, high voltage platform, small self-discharge, long cycle life, small environmental pollution, no memory effect, good safety and the like, so that the lithium ion battery is widely applied to the fields of electronic equipment, power automobiles and the like. With the continuous expansion of the application field, the requirements of people on lithium ion batteries, such as energy density, charging time, rate discharge capability, discharge temperature rise and the like, are also continuously improved. Most of the existing lithium ion batteries are of single tab structures, the charging and discharging performance of the existing lithium ion batteries is poor, and the internal resistance of the existing lithium ion batteries is increased along with the increase of the thickness of the existing lithium ion batteries, so that the service cycle life and the safety performance of the existing lithium ion batteries are seriously influenced.
Compared with a single-lug battery, the multi-lug battery has obvious advantages in various aspects such as capacity density, charging time, internal resistance, cell temperature rise and the like, so that the multi-lug battery is more and more widely applied. However, the current multi-tab battery has great technical problems in production and preparation, such as: the winding dislocation and the lug dislocation have high precision, and the poor condition of the lithium ion battery is easily caused because the winding dislocation and the lug dislocation cannot reach the precision requirement in the production and preparation process, thereby influencing the electrical performance of the whole battery.
Disclosure of Invention
One of the objects of the present invention is: by providing the multi-lug battery cell winding process, the problem of poor dislocation stability during winding of the multi-lug battery cell is solved, the debugging time of lug dislocation is shortened, the production efficiency is greatly improved, and the safety coefficient of the battery cell is improved.
In order to achieve the purpose, the invention adopts the following technical scheme: a multi-tab battery cell winding process comprises the following steps: s1, determining the sizes and the edge distances of the positive plate and the negative plate;
s2, respectively winding the plurality of pole pieces obtained after stirring, coating, rolling, pre-slitting and central slitting into a plurality of winding cores, cutting according to the size and the edge distance of the positive pole piece to obtain a first winding core, and cutting according to the size and the edge distance of the negative pole piece to obtain a second winding core;
s3, disassembling the first winding core and the second winding core to obtain a first positive plate and a first negative plate;
and S4, winding the first positive plate, the first negative plate and the diaphragm to obtain the multi-tab battery cell.
As an improvement of the multi-tab cell winding process of the present invention, in the step S2, the width of the centrally slit pole piece is greater than the width of the finished cell.
As an improvement of the multi-tab battery cell winding process in the present invention, in the step S2, the first winding core is cut according to the width of the positive electrode sheet and the edge distance of the positive electrode tab, and the second winding core is cut according to the width of the negative electrode sheet and the edge distance of the negative electrode tab.
As an improvement of the multi-tab battery cell winding process, in the step S2, the cutting mode is laser die cutting or hardware knife die cutting.
As an improvement of the multi-tab battery cell winding process in the invention, in the step S4, the width of the first positive plate is 0.2 to 15mm smaller than the width of the first negative plate.
As an improvement of the multi-tab battery cell winding process in the invention, in the step S4, the width of the separator is 0.2 to 15mm larger than the width of the first negative electrode sheet.
As an improvement of the multi-tab battery cell winding process, in the step S2, a plurality of pole pieces prepared by stirring, coating, rolling, pre-slitting and center slitting are respectively wound into a plurality of winding cores, and the method includes the following steps:
preparing a current collector: stirring the pole piece slurry to prepare a current collector;
coating active slurry: dividing the middle part of the current collector into a coating area, and dividing the upper part and the lower part of the current collector into blank areas, coating active slurry on the surface of the current collector, and removing the active slurry in the blank areas;
rolling: rolling the current collector;
slitting: pre-cutting the current collector, then centering and cutting the coating area of the current collector to obtain two pole pieces with blank areas at one side edge.
The second purpose of the invention is: the multi-lug battery cell is prepared by the multi-lug battery cell winding process, so that the debugging time of lug dislocation is reduced, the production efficiency is greatly improved, and the safety coefficient of the battery cell is improved.
The third purpose of the invention is that: the battery comprises the multi-tab battery cell, so that the safety performance and the cycle service life of the battery are effectively improved.
The fourth purpose of the invention is that: the electronic product comprises the battery, so that the use safety of the electronic product is effectively improved, and the service life of the electronic product is prolonged.
The invention has the beneficial effects that: a multi-tab battery cell winding process comprises the following steps: s1, determining the sizes and the edge distances of the positive plate and the negative plate; s2, respectively winding the plurality of pole pieces obtained after stirring, coating, rolling, pre-slitting and central slitting into a plurality of winding cores, cutting according to the size and the edge distance of the positive pole piece to obtain a first winding core, and cutting according to the size and the edge distance of the negative pole piece to obtain a second winding core; s3, disassembling the first winding core and the second winding core to obtain a first positive plate and a first negative plate; and S4, winding the first positive plate, the first negative plate and the diaphragm to obtain the multi-tab battery cell. The multi-tab battery cell winding process provided by the invention solves the problem of poor dislocation stability during winding of the multi-tab battery cell, greatly shortens the winding debugging time, improves the production efficiency, and ensures the safety performance of the battery cell.
Drawings
Fig. 1 is a schematic structural view of a first winding core before cutting in embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a first winding core after being cut according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of a first reel of the present invention after being disassembled in embodiment 1;
FIG. 4 is a schematic structural view of a second winding core of example 1 of the present invention before cutting;
FIG. 5 is a schematic view of a second core of example 1 of the present invention after cutting;
fig. 6 is a schematic structural view of a second winding core in embodiment 1 of the present invention after being disassembled;
fig. 7 is a schematic structural diagram of a multi-tab battery cell in embodiment 1 of the present invention.
Wherein: 1. a first winding core; 2. a second winding core; 3. a first positive plate; 4. a first negative plate; 5. a multi-tab battery cell.
Detailed Description
In the description of the application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, or an electrical connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1 to 7, the multi-tab battery cell winding process provided in embodiment 1 includes the following steps: s1, determining the sizes and the edge distances of the positive plate and the negative plate; s2, respectively winding the plurality of pole pieces prepared by stirring, coating, rolling, pre-slitting and central slitting into a plurality of winding cores, cutting according to the size and the edge distance of the positive pole piece to obtain a first winding core 1, and cutting according to the size and the edge distance of the negative pole piece to obtain a second winding core 2; s3, disassembling the first winding core 1 and the second winding core 2 to obtain a first positive plate 3 and a first negative plate 4; and S4, winding the first positive plate 3, the first negative plate 4 and the diaphragm to obtain the multi-tab battery cell 5.
In step S1 of this embodiment 1, the sizes of the positive and negative electrode plates and the tab edge distances of the finished product battery cells need to be defined according to the size requirement of the multi-tab battery cell 5.
Preferably, in step S2, the width of the centrally slit pole piece is greater than that of the finished battery cell. In this embodiment 1, the width of the pole piece obtained by centrally slitting is 2-5 mm larger than that of the finished battery cell; the narrow pole piece cutting can cause the capacity of the pole piece to be insufficient, and the capacity of the positive pole and the negative pole can be mismatched when the capacity is serious; the width of the pole piece may exceed the width of the diaphragm, and short circuit is easily caused. In this embodiment 1, the width of the pole piece obtained by central slitting is 2mm larger than that of the finished product battery cell, and the width of the pole piece can be designed to be 3mm, 4mm or 5mm larger than that of the finished product battery cell according to the size requirement of the finished product battery cell actually produced.
The separator may be any material suitable for a lithium ion battery separator in the art, and for example, may be a combination including, but not limited to, one or more of polyethylene, polypropylene, polyvinylidene fluoride, aramid, polyethylene terephthalate, polytetrafluoroethylene, polyacrylonitrile, polyimide, polyamide, polyester, natural fiber, and the like.
Preferably, in step S2, the first winding core 1 is cut according to the positive electrode tab width and the positive electrode tab edge distance, and the second winding core 2 is cut according to the negative electrode tab width and the negative electrode tab edge distance.
Preferably, in the step S2, the cutting manner is laser die cutting or hardware knife die cutting.
In this embodiment 1, the pole piece is preferentially cut by laser die cutting, wherein, in order to ensure the die cutting precision, the laser die cutting machine adopted in this embodiment 1 controls the length dimension error of the laser-cut pole piece to be between 0.1mm, and controls the width dimension error of the laser-cut pole piece to be between 0.1 mm. In order to ensure the flatness of the die cutting of the pole piece, the speed of a laser cutting line is more than 200 mm/s. Specifically, the length of the exposed burr of the laser cutting pole piece is less than 0.02mm in the X direction, less than 0.008mm in the Z direction, and meanwhile, the powder falling stacking height on the laser cutting edge is not more than 0.2 mm.
In order to avoid the problem of short circuit caused by the fact that the width of the pole piece exceeds the width of the separator during winding, in the embodiment 1, the width of the first positive pole piece 3 is 0.2-15 mm smaller than the width of the first negative pole piece 4. The width of the diaphragm is 0.2-15 mm larger than that of the first negative plate 4.
Preferably, in step S2, the method includes the steps of respectively winding a plurality of pole pieces obtained by stirring, coating, rolling, pre-slitting and central slitting into a plurality of winding cores, and includes the following steps:
preparing a current collector: stirring the pole piece slurry to prepare a current collector;
coating active slurry: dividing the middle part of the current collector into a coating area, and dividing the upper part and the lower part of the current collector into blank areas, coating active slurry on the surface of the current collector, and removing the active slurry in the blank areas;
rolling: rolling the current collector;
slitting: pre-cutting the current collector, and then performing centered cutting on the coating area of the current collector to obtain two pole pieces with blank areas on one side edge.
Specifically, when the active slurry is coated, the defined blank area is rectangular, and when the length and the width of the blank area which is respectively arranged at the upper part and the lower part of the surface of the current collector are designed, the length and the width of the blank area are ensured to be matched with the length and the width of a plurality of tabs.
Example 2
This embodiment 2 provides a multi-tab battery cell, which is prepared by the above-mentioned multi-tab battery cell winding process, and which reduces the debugging time of tab dislocation, greatly improves the production efficiency, and improves the safety factor of the battery cell.
Example 3
This embodiment 3 provides a battery, and it includes foretell many utmost point ear electricity core, has effectively improved the security performance and the recycling life of battery.
Example 4
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should understand that the embodiments as a whole may be combined as appropriate to form other embodiments understood by those skilled in the art.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A multi-tab battery cell winding process is characterized by comprising the following steps:
s1, determining the sizes and the edge distances of the positive plate and the negative plate;
s2, respectively winding the plurality of pole pieces obtained after stirring, coating, rolling, pre-slitting and central slitting into a plurality of winding cores, cutting according to the size and the edge distance of the positive pole piece to obtain a first winding core (1), and cutting according to the size and the edge distance of the negative pole piece to obtain a second winding core (2);
s3, disassembling the first winding core (1) and the second winding core (2) to obtain a first positive plate (3) and a first negative plate (4);
s4, winding the first positive plate (3), the first negative plate (4) and the diaphragm to obtain the multi-tab battery cell (5).
2. The multi-tab cell winding process of claim 1, characterized in that: in the step S2, the width of the centrally slit pole piece is greater than the width of the finished battery cell.
3. The multi-tab cell winding process of claim 1, characterized in that: in the step of S2, the first winding core (1) is cut according to the width of the positive plate and the edge distance of the positive tab, and the second winding core (2) is cut according to the width of the negative plate and the edge distance of the negative tab.
4. The multi-tab cell winding process of claim 2, characterized in that: and in the step S2, the cutting mode is laser die cutting or hardware knife die cutting.
5. The multi-tab cell winding process of claim 1, characterized in that: in the step S4, the width of the first positive electrode tab (3) is 0.2 to 15mm smaller than the width of the first negative electrode tab (4).
6. The multi-tab cell winding process of claim 1, characterized in that: in the step S4, the width of the diaphragm is 0.2-15 mm greater than the width of the first negative electrode sheet (4).
7. The multi-tab cell winding process of claim 1, characterized in that: in the step S2, the plurality of pole pieces obtained by stirring, coating, rolling, pre-slitting and center slitting are respectively wound into a plurality of winding cores, and the method includes the following steps:
preparing a current collector: stirring the pole piece slurry to prepare a current collector;
coating active slurry: dividing the middle part of the current collector into a coating area, and dividing the upper part and the lower part of the current collector into blank areas, coating active slurry on the surface of the current collector, and removing the active slurry in the blank areas;
rolling: rolling the current collector;
slitting: pre-cutting the current collector, then centering and cutting the coating area of the current collector to obtain two pole pieces with blank areas at one side edge.
8. A multi-tab battery cell, which is prepared by the multi-tab battery cell winding process of any one of claims 1 to 7.
9. A battery comprising the multi-tab cell of claim 8.
10. An electronic product characterized by comprising the battery of claim 9.
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| CN202111216678.XA CN114050324A (en) | 2021-10-19 | 2021-10-19 | Multi-tab battery cell winding process, multi-tab battery cell, battery and electronic product |
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| CN202111216678.XA CN114050324A (en) | 2021-10-19 | 2021-10-19 | Multi-tab battery cell winding process, multi-tab battery cell, battery and electronic product |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023273990A1 (en) * | 2021-06-29 | 2023-01-05 | 比亚迪股份有限公司 | Method for preparing positive electrode plate, and positive electrode plate and battery having same |
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