CN114614102A - Preparation method and application of composite current collector battery cell - Google Patents
Preparation method and application of composite current collector battery cell Download PDFInfo
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- CN114614102A CN114614102A CN202210277791.7A CN202210277791A CN114614102A CN 114614102 A CN114614102 A CN 114614102A CN 202210277791 A CN202210277791 A CN 202210277791A CN 114614102 A CN114614102 A CN 114614102A
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- current collector
- metal foil
- composite current
- pole piece
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- 239000002131 composite material Substances 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 82
- 239000002184 metal Substances 0.000 claims abstract description 82
- 239000011888 foil Substances 0.000 claims abstract description 78
- 238000003466 welding Methods 0.000 claims abstract description 34
- 238000000576 coating method Methods 0.000 claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 22
- 238000005452 bending Methods 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 description 6
- 238000003475 lamination Methods 0.000 description 5
- 229920006254 polymer film Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910000679 solder Inorganic materials 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 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
-
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
-
- 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)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a preparation method and application of a composite current collector battery cell, wherein the preparation method comprises the steps of coating a pole piece structure of a coating area, a blank area and a coating area on the surface of a composite current collector at intervals; then die-cutting the pole piece structure to obtain a connected pole piece, wherein the connected pole piece consists of two pole pieces, and the pole pieces are connected by a pole lug; respectively clamping the tabs by using a first metal foil and a second metal foil, and performing pre-welding in a three-layer overlapping area; and finally, bending the pre-welded connected pole piece into a U shape, stacking and welding to obtain the composite current collector cell. The preparation method can obviously reduce the number of layers of the metal foil during welding, prolong the service life of the welding head and avoid the problems of over-thick thickness of the tab and fracture of a welding spot.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery manufacturing, and particularly relates to a preparation method of a composite current collector battery cell, and an application of the preparation method in preparation of a composite current collector battery.
Background
The current collector is an indispensable component in the lithium ion battery, not only is a carrier of the positive and negative active materials, but also plays a role in collecting and outputting current. Usually, a metal foil is selected as a current collector, wherein an aluminum foil is selected as a positive current collector, and a copper foil is selected as a negative current collector. With the development of technology, new composite current collectors are receiving more and more attention from the aspects of energy density and safety.
The composite current collector is a novel current collector with a layered structure, which is formed by taking a polymer film as a base material and depositing a metal layer on the surface of the polymer film. The metal layers on both sides of the composite current collector cannot be conducted due to the existence of the polymer film. At present, a common method is to clamp a layer of composite current collector by two layers of metal foils for ultrasonic welding to conduct metal layers on two sides of the composite current collector, and then weld the multiple layers of metal foils with positive and negative electrode tabs of a lithium battery, so as to solve the problem of leading out the tabs of the composite current collector. However, with such a structure, each layer of composite current collector needs to be matched with two layers of metal foils, which increases the weight of the battery and affects the energy density of the battery; and the metal foil material of excessive number of piles can make utmost point ear department thickness increase, causes certain influence to follow-up battery welding and equipment, still can lead to the rosin joint of utmost point ear, causes the influence to the performance of battery.
Disclosure of Invention
In view of the above, the present invention needs to provide a method for manufacturing a composite current collector cell, which can significantly reduce the number of layers of metal foil during welding, prolong the service life of a welding head, and avoid the problems of excessive thickness at a tab and breakage of a welding spot.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a composite current collector cell, which comprises the following steps:
coating the surface of the composite current collector at intervals to form a pole piece structure of a coating area, a blank area and a coating area;
die cutting is carried out on the pole piece structure to obtain a connected pole piece, wherein the connected pole piece consists of two pole pieces, and the pole pieces are connected through a pole lug;
respectively clamping the tabs by using a first metal foil and a second metal foil, and performing pre-welding in a three-layer overlapping area;
and bending the pre-welded connected pole piece into a U shape, stacking and welding to obtain the composite current collector cell.
In a further scheme, the composite current collector is an aluminum-plated composite current collector or a copper-plated composite current collector.
In a further aspect, the first metal foil and the second metal foil are made of aluminum or copper respectively and independently.
In a further scheme, the first metal foil and the second metal foil are respectively located on the inner side and the outer side of the tab, and the height of the first metal foil is smaller than that of the second metal foil.
In a further scheme, the widths of the first metal foil and the second metal foil are the same as the widths of the tabs.
In a further scheme, the height of the first metal foil is 3-12mm, and the height of the second metal foil is 6-20 mm.
In a further scheme, the height of the first metal foil is 3-8mm, and the height of the second metal foil is 6-13 mm.
In a further scheme, the prewelding adopts ultrasonic welding.
The invention further provides a composite current collector cell obtained by the preparation method of any one of the above.
The invention also provides a composite current collector battery, which comprises a composite current collector battery cell, wherein the composite current collector battery cell is obtained by adopting the preparation method of any one of the above.
Compared with the prior art, the invention has the following beneficial effects:
in the preparation process of the composite current collector cell, two pole pieces share one tab, and the inner side of the connected pole pieces uses the metal foil with lower height, so that the quantity of the metal foil led out is reduced to about 1/4 of the original quantity, and the quality of the metal foil used is reduced to less than 1/2 of the original quality. The weight of the battery cell can be reduced, the service life of the welding head can be prolonged, and the difficulty of battery cell assembly caused by overlarge thickness of the lug can be avoided.
Drawings
FIG. 1 is a schematic diagram of a pole piece structure formed by conventional coating according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a pole piece structure formed by intermittent coating according to a preferred embodiment of the present invention;
FIG. 3 is a schematic structural diagram of the conjoined pole piece according to a preferred embodiment of the present invention;
FIG. 4 is a schematic structural view of the conjoined pole piece in FIG. 3 after being bent;
FIG. 5 is a schematic structural view of the conjoined pole piece in FIG. 4 after being pre-welded;
FIG. 6 is a schematic view of the structure of the pre-welded conjoined pole piece of FIG. 5 after bending;
FIG. 7 is an enlarged schematic view of the solder joint structure 3 in FIG. 6;
fig. 8 is a schematic diagram of a bare cell structure assembled by pre-welded connected pole pieces.
In the figure: 1-coating a pole piece structure, 11-a coating area and 12-a blank area;
2-conjoined pole piece, 21-pole piece, 22-pole ear;
3-welding spot structure, 31-first metal foil, 32-second metal foil and 33-welding spot area.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention discloses a preparation method of a composite current collector cell, wherein the composite current collector cell refers to a bare cell prepared from a composite current collector, the composite current collector refers to a current collector which is formed by taking a polymer film as a base material and depositing a metal layer on the surface of the polymer film to form a layered structure, the specific type of the current collector is not particularly limited, and the composite current collector can be any composite current collector conventionally adopted in the field.
The preparation method of the composite current collector cell mainly comprises the following steps:
coating of
A pole piece structure of a coating area, a blank area and a coating area is formed on the surface of the composite current collector through coating, and specifically, a blank area which is not coated is formed between the adjacent coating areas. The coating method is not particularly limited, and may be a continuous coating method or a batch coating method.
Slicing
The coated pole piece structure is baked, rolled and cut, and then die-cut to obtain the connected pole piece, specifically, the connected pole piece consists of two pole pieces, and the two pole pieces are connected into a whole by a pole lug. For the structure of the conjoined pole piece, the pole pieces are connected by the pole lugs, so that the pole lugs can be bent to form a U-shaped structure with two opposite pole pieces.
Prewelding
And respectively clamping the lug by using a first metal foil and a second metal foil on two side surfaces of the lug, wherein the first metal foil is positioned on the inner side of the lug, and the second metal foil is positioned on the outer side of the lug to form a three-layer structure of the first metal foil, the lug and the second metal foil. According to the embodiment of the invention, the width of the first metal foil and the width of the second metal foil are consistent with the width of the tab, and the height of the first metal foil is smaller than that of the second metal foil, and in some specific embodiments of the invention, the height of the first metal foil is 3-12mm, preferably 3-8 mm; the height of the second metal foil is 6-20mm, preferably 6-13 mm. It can be understood that, in this document, the material of the first metal foil and the second metal foil is selected to be consistent with the material of the composite current collector, for example, an aluminum-plated composite current collector is selected as the positive current collector, and the first metal foil and the second metal foil are aluminum foils; if the copper-plated composite current collector is selected as the negative current collector, the first metal foil and the second metal foil are selected from copper foils.
Further, the pre-welding is performed in the overlapping region of the three-layer structure of the first metal foil-tab-second metal foil, and the pre-welding may be performed in a conventional manner in the art without particular limitation, and in one or more embodiments of the present invention, the pre-welding is performed by ultrasonic welding.
Lamination welding
Specifically, the pre-welded connected pole piece is bent into a U shape, the bending direction is the side where the first metal foil is located, and then the lamination and welding are carried out to obtain the composite current collector cell. Specifically, a second metal foil positioned outside the tab is welded to the battery tab to form a composite current collector cell, which is not described in detail herein since lamination and welding are conventional in the art.
The invention provides a composite current collector cell, which is obtained by the preparation method of the first aspect of the invention, wherein two pole pieces share one tab, and the inner side of the connected pole piece uses a first metal foil with lower height, so that the quantity of the led metal foils is reduced, the weight of the cell can be reduced, the service life of a welding head is prolonged, and the cell assembly difficulty caused by overlarge thickness of the tab can be avoided.
In a third aspect, the present invention provides a composite current collector battery, which includes a composite current collector cell obtained by the preparation method according to the first aspect of the present invention. It is to be understood that the process of forming a battery from the assembled cells is conventional in the art and will not be described in detail herein.
The present invention is illustrated below by way of specific examples, which are intended to be illustrative only and not to limit the scope of the present invention in any way, and reagents and materials used therein are commercially available, unless otherwise specified, and conditions or steps thereof are not specifically described.
The embodiment provides a preparation method of a composite current collector cell, which mainly comprises the following steps:
s1, coating the surface of the composite current collector to form a structure of 'coating area 11-blank area 12-coating area 11', wherein the structure is schematically shown as a coating pole piece structure 1 shown in figure 1 or figure 2;
s2, after baking, rolling and slitting, die cutting is carried out on the coated pole piece structure 1 to form a connected pole piece 2 of a pole piece 21-a pole lug 22-a pole piece 21, and the structure of the connected pole piece 2 is shown in figure 3; in other embodiments of the present invention, the conjoined pole piece 2 may be bent at the middle tab 22 to form a U-shape opposite to the pole piece 21, as shown in fig. 4;
s3, respectively clamping two metal foils on two side faces of a tab 22 in a connected pole piece 2 to form a three-layer sandwich structure of 'a first metal foil 31-the tab 22-a second metal foil 32', and pre-welding the three-layer overlapped area, wherein the welded structure is shown in figure 5, the pre-welding mode in the embodiment adopts ultrasonic welding, and the welding point structure 3 is shown in figure 6, wherein the first metal foil 31 is positioned on the inner side of the tab 22, the second metal foil 32 is positioned on the outer side of the tab 22, and the widths of the first metal foil 31 and the second metal foil 32 are consistent with the tab 22; in addition, the height of the first metal foil 31 is smaller than that of the second metal foil 32, the height of the first metal foil 31 is preferably 3-12mm, more preferably 3-8mm, and the height of the second metal foil 32 is preferably 6-20mm, more preferably 6-13 mm;
s4, bending the pre-welded integrated pole piece 2 in the step S3 inwards to form a U shape, and the structure is shown in FIG. 6. To more clearly express the structure of the solder region 33, the solder structure 3 in fig. 6 is enlarged as shown in fig. 7.
S5, stacking the integrated pole piece 2 with the corresponding pole piece and the corresponding diaphragm, and welding the second metal foil 32 of the stacked multiple integrated pole pieces with the battery tab, where the structure is as shown in fig. 8 (in order to better show the welding of the multiple integrated pole pieces 2 with the battery tab, the corresponding pole piece and the corresponding diaphragm are not shown in fig. 8), so as to obtain the composite current collector bare cell.
Assembling the obtained bare cell of the composite current collector to obtain a composite current collector battery, wherein in the process of assembling the composite current collector battery, when corresponding pole pieces and diaphragms are matched for lamination, if the corresponding pole pieces are prepared by adopting conventional metal current collectors, the corresponding pole pieces can be single-piece; if the corresponding pole piece is also prepared by adopting the composite current collector, the corresponding pole piece can be a connected pole piece, and the structure of the pole piece is also carried out according to the steps. When the lamination is carried out, the tab can be taken out from the same side or from the different side according to the design. After the bare cell is obtained, the subsequent processes of assembling, injecting liquid and the like are conventional processes for manufacturing the lithium battery, and are not specifically explained here.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The preparation method of the composite current collector cell is characterized by comprising the following steps of:
coating the surface of the composite current collector at intervals to form a pole piece structure of a coating area, a blank area and a coating area;
die-cutting the pole piece structure to obtain a connected pole piece, wherein the connected pole piece consists of two pole pieces, and the pole pieces are connected by a pole lug;
respectively clamping the tabs by using a first metal foil and a second metal foil, and performing pre-welding in a three-layer overlapping area;
and bending the pre-welded connected pole piece into a U shape, stacking and welding to obtain the composite current collector cell.
2. The method of manufacturing according to claim 1, wherein the composite current collector is an aluminum plated composite current collector or a copper plated composite current collector.
3. The method of claim 2, wherein the first metal foil and the second metal foil are made of aluminum or copper, respectively.
4. The manufacturing method according to claim 1, wherein the first metal foil and the second metal foil are respectively located on the inner side and the outer side of the tab, and the first metal foil is smaller in height than the second metal foil.
5. The manufacturing method according to claim 1, wherein the first and second metal foils have the same width as the tab.
6. The method of claim 1, wherein the first metal foil has a height of 3 to 12mm and the second metal foil has a height of 6 to 20 mm.
7. The method of claim 6, wherein the first metal foil has a height of 3 to 8mm and the second metal foil has a height of 6 to 13 mm.
8. The method of claim 1, wherein the pre-welding is ultrasonic welding.
9. A composite current collector cell obtained by the method of any one of claims 1 to 8.
10. A composite current collector battery comprising a composite current collector cell, characterized in that said composite current collector cell is obtained with the manufacturing method according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210277791.7A CN114614102A (en) | 2022-03-21 | 2022-03-21 | Preparation method and application of composite current collector battery cell |
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| CN202210277791.7A CN114614102A (en) | 2022-03-21 | 2022-03-21 | Preparation method and application of composite current collector battery cell |
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| CN114068862A (en) * | 2021-11-11 | 2022-02-18 | 苏州达牛新能源科技有限公司 | Battery pole piece based on composite current collector and preparation method thereof |
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