CN116505053A - Full-lug cylindrical battery cell, battery, electric equipment and preparation method thereof - Google Patents
Full-lug cylindrical battery cell, battery, electric equipment and preparation method thereof Download PDFInfo
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- CN116505053A CN116505053A CN202310771835.6A CN202310771835A CN116505053A CN 116505053 A CN116505053 A CN 116505053A CN 202310771835 A CN202310771835 A CN 202310771835A CN 116505053 A CN116505053 A CN 116505053A
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- tab
- battery
- conductive adhesive
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- adhesive layer
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- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 239000012790 adhesive layer Substances 0.000 claims abstract description 127
- 239000010410 layer Substances 0.000 claims abstract description 62
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 36
- 239000006258 conductive agent Substances 0.000 claims description 24
- 238000000576 coating method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 239000003792 electrolyte Substances 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 239000006229 carbon black Substances 0.000 claims description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 3
- 229920001197 polyacetylene Polymers 0.000 claims description 3
- 229920000767 polyaniline Polymers 0.000 claims description 3
- 229920000128 polypyrrole Polymers 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000004544 sputter deposition Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000004804 winding Methods 0.000 description 8
- 239000002002 slurry Substances 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 239000003292 glue Substances 0.000 description 5
- 239000011149 active material Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000013543 active substance Substances 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
-
- 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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The application provides a full-lug cylindrical battery cell, a battery, electric equipment and a preparation method thereof, and belongs to the technical field of new energy. The preparation method of the full-lug cylindrical battery cell comprises the following steps: providing a battery anode and a battery cathode with conductive adhesive layers; the first diaphragm, the battery anode, the second diaphragm and the battery cathode are sequentially wound, shaped and flattened, so that the part of the conductive adhesive layer on the electrode lug of the next layer is positioned between two adjacent electrode lugs of the upper layer and the lower layer, and the conductive adhesive layer of the rest part is exposed, thus obtaining a full-electrode lug cylindrical naked cell; and providing a current collecting disc, assembling the current collecting disc and the full-lug cylindrical bare cell so that the conductive adhesive layer of the exposed part is positioned between the lug and the current collecting disc, and then performing heat treatment to solidify and crosslink the conductive adhesive layer.
Description
Technical Field
The application relates to the technical field of new energy, in particular to a full-lug cylindrical battery cell, a battery, electric equipment and a preparation method thereof.
Background
In the prior art, the current preparation method of the full-tab cylindrical battery cell has the problem that the prepared cylindrical battery cell is poor in conductivity and structural strength.
Disclosure of Invention
The utility model aims to provide a full-tab cylindrical battery cell, battery, electric equipment and preparation method thereof, which can solve the problem that the electrical conductivity and the structural strength of the cylindrical battery cell prepared by the existing preparation technology are poor.
Embodiments of the present application are implemented as follows:
in a first aspect, an embodiment of the present application provides a method for preparing a full-tab cylindrical battery cell, including the following steps:
providing a battery anode and a battery cathode with conductive adhesive layers, wherein the conductive adhesive layers are positioned on one side surface of the electrode lug and at one end far away from the coating area; the first diaphragm, the battery anode, the second diaphragm and the battery cathode are sequentially wound, shaped and flattened, so that the part of the conductive adhesive layer on the electrode lug of the next layer is positioned between two adjacent electrode lugs of the upper layer and the lower layer, and the conductive adhesive layer of the rest part is exposed, thus obtaining a full-electrode lug cylindrical naked cell; and providing a current collecting disc, assembling the current collecting disc and the full-lug cylindrical bare cell so that the conductive adhesive layer of the exposed part is positioned between the lug and the current collecting disc, and then performing heat treatment so as to solidify and crosslink the conductive adhesive layer.
In the above technical scheme, the battery anode and the battery cathode with the conductive adhesive layers are directly provided, and then the battery anode and the battery cathode are sequentially wound, shaped and beaten to be flat, so that the full-tab cylindrical battery core which is bonded between the upper layer adjacent tab and the lower layer adjacent tab and between the full-tab and the current collecting disc through the conductive adhesive layers can be obtained; in addition, compared with the conventional battery core assembly process, the battery anode and the battery cathode with the conductive adhesive layers are directly provided, so that the battery core assembly process can be simplified, and the efficiency is improved.
In some alternative embodiments, in the step of providing the battery positive electrode and the battery negative electrode with the conductive adhesive layer, the conductive adhesive layer is formed in the tab region of the battery positive electrode and the tab region of the battery negative electrode, respectively, and then the tab region of the battery positive electrode and the tab region of the battery negative electrode are beveled by using a laser device.
In the above technical scheme, the conductive adhesive layer is integrally prepared in the tab area of the battery anode and the battery cathode before chamfering, and compared with the preparation of the conductive adhesive layer in the corresponding area of each tab after chamfering, the method has the advantages of simple process, higher efficiency and better consistency of the prepared conductive adhesive layers (the number of tabs is more, if the conductive adhesive layers are prepared on the tabs respectively, the consistency of the prepared conductive adhesive layers is easy to be worse).
In some alternative embodiments, the manner in which the conductive paste is applied during formation of the conductive paste layer includes at least one of spraying, coating, and sputtering.
In the technical scheme, the preparation modes of the conductive adhesive layer are numerous, and more implementable modes can be provided, so that the technical scheme provided by the application is convenient to popularize and apply.
In some alternative embodiments, during the chamfer, the chamfer angle α is 30 ° to 60 °.
In the technical scheme, the angle alpha of the oblique cutting is limited in a specific range, the advantages that laser cutting is convenient to conduct and the electrode lugs after the oblique cutting have higher yield are achieved, meanwhile, the oblique cutting can be conducted according to the angle, the formed electrode lugs have proper angles, and therefore follow-up winding is convenient.
In some alternative embodiments, pressure is applied to the blank area of the side of the tab on which the conductive adhesive layer is disposed during the shaping process to bend the tab toward the side facing away from the conductive adhesive layer.
According to the technical scheme, the pressure is applied to the lugs according to the specific direction, so that the risk of damaging the conductive adhesive layer can be effectively reduced.
In some alternative embodiments, in the positive electrode and the negative electrode of the battery, the size of the conductive adhesive layer accounts for 10% -50% of the size of the tab in the first preset direction, and the first preset direction is the same as the width direction of the positive electrode of the battery.
In the technical scheme, the size ratio of the conductive adhesive layer to the corresponding tab in the first preset direction is limited in a specific range, so that good conductivity can be provided for the corresponding full-tab cylindrical battery cell.
In some alternative embodiments, the thickness of the conductive glue layer is 0.1 to 500 μm.
In the technical scheme, the thickness of the conductive adhesive layer is limited in a specific range, so that good conductivity can be provided for the corresponding full-tab cylindrical battery cell, and meanwhile, a good bonding and fixing effect can be provided for the proper thickness dimension.
In some alternative embodiments, the conductive agent in the conductive paste layer includes at least one of an inorganic conductive agent and an organic conductive agent.
In some alternative embodiments, the inorganic conductive agent includes at least one of carbon black, nano silver, and nano copper.
In some alternative embodiments, the organic conductive agent includes at least one of polypyrrole, polyaniline, and polyacetylene.
In the above technical scheme, the variety of the conductive agent in the conductive adhesive layer is more, and more implementable embodiments can be provided, so that the technical scheme provided by the application is convenient to popularize and apply.
In a second aspect, an embodiment of the present application provides a full-tab cylindrical electrical core, which is manufactured by using a method for manufacturing a full-tab cylindrical electrical core as provided in the embodiment of the first aspect.
In some alternative embodiments, the exposed portion of the conductive adhesive layer on the tab of the next layer has a size of 0.1 to 2 mm in a first preset direction, and the first preset direction is the same as the width direction of the positive electrode of the battery.
In the technical scheme, the size of the exposed part of the conductive adhesive layer is limited in a specific range, so that a proper flow guiding area can be provided, and the good conductive performance is provided.
In some alternative embodiments, the size of the portion of the conductive adhesive layer on the tab of the next layer that is blocked by the tab of the adjacent upper layer is 0.1-2 mm.
In the technical scheme, the size of the shielded part of the conductive adhesive layer is limited in a specific range, so that a proper bonding area can be provided, and a good bonding fixing effect, a good conductive effect and a good heat conduction effect are provided.
In a third aspect, embodiments of the present application provide a battery, including a full tab cylindrical cell, an electrolyte, and a housing as provided in the embodiments of the second aspect; the full-lug cylindrical battery cell and the electrolyte are contained in the shell.
In a fourth aspect, an embodiment of the present application provides an electric device, including a full-tab cylindrical electric core as provided in an embodiment of the third aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a battery electrode with a conductive adhesive layer before chamfering according to an embodiment of the present application;
FIG. 2 is a schematic view of the structure of the cell electrode of FIG. 1 after beveling;
fig. 3 is a schematic structural diagram of a wound battery electrode with a conductive adhesive layer according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a shaped battery electrode with a conductive adhesive layer according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a battery electrode with a conductive adhesive layer after leveling according to an embodiment of the present application.
Icon: 10-battery electrodes; 11-a paint zone; 12-spacers; 13-tab region; 14-a conductive adhesive layer; a-a first preset direction; b-a second preset direction.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In addition, in the description of the present application, unless otherwise indicated, "one or more" means "a plurality of" means two or more; the range of the values a to b includes the two end values "a" and "b", and the "measurement unit" in the values a to b+measurement unit "represents the" measurement unit "of both the values a and b.
In the prior art, in the preparation process of the cylindrical battery cell with all lugs, the conductive adhesive layer is usually prepared in the corresponding area of each lug in the battery anode and the battery cathode after the winding is completed, and the preparation process can only realize the bonding of the all lugs and the current collecting disc through the conductive adhesive layer, and can not realize the bonding between the adjacent lugs on the upper layer and the lower layer through the conductive adhesive layer, so that the cylindrical battery cell has the problem of poor conductive performance and structural strength.
Based on the above, the inventor researches and discovers that by directly providing a battery anode and a battery cathode with a conductive adhesive layer, a full-tab cylindrical battery cell which is bonded between an upper layer adjacent tab and a lower layer adjacent tab and between a full tab and a current collecting disc through the conductive adhesive layer can be prepared, so that the problem that the conductive performance and the structural strength of the cylindrical battery cell prepared by the existing preparation process are poor can be solved.
The following specifically describes a full-tab cylindrical battery cell, a battery, electric equipment and a preparation method thereof.
In a first aspect, an embodiment of the present application provides a method for preparing a full-tab cylindrical battery cell, including the following steps:
providing a battery anode and a battery cathode with conductive adhesive layers, wherein the conductive adhesive layers are positioned on one side surface of the electrode lug and at one end far away from the coating area; the first diaphragm, the battery anode, the second diaphragm and the battery cathode are sequentially wound, shaped and flattened, so that the part of the conductive adhesive layer on the electrode lug of the next layer is positioned between two adjacent electrode lugs of the upper layer and the lower layer, and the conductive adhesive layer of the rest part is exposed, thus obtaining a full-electrode lug cylindrical naked cell; and providing a current collecting disc, assembling the current collecting disc and the full-lug cylindrical bare cell so that the conductive adhesive layer of the exposed part is positioned between the lug and the current collecting disc, and then performing heat treatment so as to solidify and crosslink the conductive adhesive layer.
In the preparation process provided by the embodiment of the invention, as the prepared full-tab cylindrical battery core can be bonded between the upper layer adjacent tab and the lower layer adjacent tab and between the full-tab and the current collecting disc through the conductive adhesive layer, compared with the traditional preparation process (generally, the conductive adhesive layer is prepared in the corresponding area of each tab in the battery anode and the battery cathode after the winding is finished, only the bonding between the full-tab and the current collecting disc through the conductive adhesive layer can be realized, the bonding between the upper layer adjacent tab and the lower layer adjacent tab can not be realized through the conductive adhesive layer, and the poor conductive performance and structural strength can be caused), the prepared full-tab cylindrical battery core can realize the bonding between the upper layer adjacent tab and the lower layer adjacent tab and between the full-tab and the current collecting disc through the conductive adhesive layer, wherein the exposed part of the conductive adhesive layer positioned on the lower layer tab area is used for being connected with the corresponding current collecting disc to exert the conductive function, and the conductive adhesive layer positioned between the lower layer tab area and the upper layer tab area can be realized, and the current conductive adhesive layer can be prepared to have the conductive performance and the poor conductive performance, and the preparation process can be realized, and the thermal conductivity can be improved; in addition, compared with the conventional battery core assembly process, the battery anode and the battery cathode with the conductive adhesive layers are directly provided, so that the battery core assembly process can be simplified, and the efficiency is improved.
It should be noted that, the basic structures of the battery positive electrode and the battery negative electrode provided in the embodiments of the present application are the same as those of the conventional arrangements in the art, that is, before winding, in the width direction of the battery electrode (the width direction of the battery positive electrode is taken as an example in the embodiments of the present application), the battery electrode (the battery positive electrode and the battery negative electrode) includes a coating area, a spacing area and a tab area that are distributed in sequence.
The materials of the first separator, the battery positive electrode, the second separator and the battery negative electrode are not limited, and may be selected and set according to the conventional method in the art.
In the embodiment that this application provided, the conducting resin layer presents the solid state at normal atmospheric temperature and is convenient for carry out processes such as chamfer and winding, thereby can solidification cross-link possess the viscidity after the heating treatment to realize bonding between utmost point ear and current collecting plate, utmost point ear and the utmost point ear.
It should be noted that in the field, in the preparation process of the cylindrical battery cell with all tabs, the baking process of the battery cell is an essential step, and in the preparation process provided by the embodiment of the invention, the conductive adhesive layers on the positive electrode and the negative electrode of the battery complete the curing and crosslinking at the same time of the baking process of the battery cell, and the curing and bonding between the tabs and the current collecting disc can be realized without additionally carrying out a heating and curing process, so that the preparation process of the battery cell has higher matching degree with the existing preparation process of the battery cell.
It can be understood that, because the coating area and the tab area are distributed independently, the formation of the active material layer can be performed simultaneously with the formation of the conductive adhesive, or the active material layer can be formed first and then the conductive adhesive layer can be formed, or the conductive adhesive layer can be formed first and then the active material layer can be formed.
It should be noted that, the manner of providing the battery anode and the battery cathode with the conductive adhesive layers is not limited, and the battery anode and the battery cathode can be purchased directly or prepared by oneself, and the embodiment of the application takes self-preparation as an example.
In the process of preparing the battery anode and the battery cathode with the conductive adhesive layers by self, the conductive adhesive layers can be firstly formed in the lug areas of the battery electrodes and then beveled, or the conductive adhesive layers can be formed in the corresponding areas of the lugs after beveled.
As an example, in the step of providing the battery positive electrode and the battery negative electrode with the conductive paste layer, the conductive paste layer is formed in the tab region of the battery positive electrode and the tab region of the battery negative electrode, respectively, and then the tab region of the battery positive electrode and the tab region of the battery negative electrode are beveled by using a laser device.
For a better understanding of the technical solution, the description is given here with reference to a schematic view, wherein fig. 1 shows a schematic view of the structure of the battery electrode with the conductive glue layer before beveling, and fig. 2 shows a schematic view of the structure of the battery electrode with the conductive glue layer after beveling in fig. 1.
In this embodiment, the conductive adhesive layer is integrally prepared in the tab area of the positive electrode and the negative electrode of the battery before chamfering, and compared with the preparation of the conductive adhesive layer in the corresponding area of each tab after chamfering, the method has the advantages of simple process, higher efficiency and better consistency of the prepared conductive adhesive layers (the number of tabs is more, if the conductive adhesive layers are prepared on the tabs respectively, the consistency of the prepared conductive adhesive layers is easily worse).
It should be noted that the manner of preparing the conductive adhesive layer is not limited, and may be set according to conventional choices in the art.
As an example, in forming the conductive paste layer, the manner of applying the conductive paste includes at least one of spraying, coating, and sputtering.
In this embodiment, the preparation mode of electrically conductive glue film is numerous, can provide more implementable ways to be convenient for promote and use the technical scheme that this application provided.
It can be appreciated that the quality of the beveled tab is closely related to the parameters associated with the beveled process.
As an example, in the chamfering process, the chamfer angle α is 30 ° to 60 °. Such as, but not limited to, a range of values at any one or between any two of angles 30 °, 40 °, 50 ° and 60 °.
In this embodiment, the angle α of the bevel cutting is limited within a specific range, which has the advantages of being convenient for performing laser cutting and having a higher yield of the beveled tab, and meanwhile, the bevel cutting according to the angle can enable a plurality of formed tabs to have appropriate angles, thereby facilitating subsequent winding.
As an example, in the chamfering process, the size of the single tab in the second preset direction is 1-4 mm, and the second preset direction is the same as the length direction of the battery anode.
It will be appreciated that the direction of force applied during the shaping process is particularly important when facing the battery electrode with the conductive paste layer provided in the embodiments of the present application, as compared to a battery electrode of conventional construction (i.e., a battery electrode without the conductive paste layer).
As an example, during the shaping process, pressure is applied to the blank area of the side of the tab where the conductive adhesive layer is disposed, so that the tab is bent toward the side facing away from the conductive adhesive layer.
In the embodiment, the pressure is applied to the lugs according to the specific direction, so that the risk of damaging the conductive adhesive layer can be effectively reduced.
It can be understood that the size ratio of the conductive adhesive layer in the tab is closely related to the conductivity of the corresponding full tab cylindrical cell.
As an example, in the battery positive electrode and the battery negative electrode, in the first preset direction, the size of the conductive adhesive layer accounts for 10% -50% of the size of the tab, for example, but not limited to any one point value or a range value between any two points of 10%, 20%, 30%, 40% and 50%; the first preset direction is the same as the width direction of the battery anode.
In the embodiment, the size ratio of the conductive adhesive layer to the corresponding tab in the first preset direction is limited in a specific range, so that good conductivity can be provided for the corresponding full-tab cylindrical battery cell.
It will be appreciated that the thickness of the conductive adhesive layer is closely related to its conductivity and the adhesive securing effect.
As one example, the thickness of the conductive adhesive layer is 0.1-500 μm, such as, but not limited to, a thickness of 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 50 μm, 100 μm, 200 μm, 300 μm, 400 μm, and 500 μm, or any one point value or a range value between any two.
In this embodiment, the thickness of the conductive adhesive layer is limited in a specific range, so that better conductivity can be provided for the corresponding full-tab cylindrical battery cell, and meanwhile, a better bonding and fixing effect can be provided for a proper thickness dimension.
It should be noted that the kind of the conductive agent in the conductive adhesive layer is not limited, and may be set according to conventional choices in the art.
As one example, the conductive agent in the conductive paste layer includes at least one of an inorganic conductive agent and an organic conductive agent.
As one example, the inorganic conductive agent includes at least one of carbon black, nano silver, and nano copper.
As one example, the organic conductive agent includes at least one of polypyrrole, polyaniline, and polyacetylene.
It should be noted that, when the conductive agent is an inorganic conductive agent, a binder and a solvent are also required to be added in the process of preparing the conductive adhesive layer slurry; when the conductive agent is an organic conductive agent, a binder, a solvent and an initiator are also required to be added in the process of preparing the conductive layer paste.
In this embodiment, the kind of the electrically conductive agent in the electrically conductive glue film is more, can provide more implementable schemes to be convenient for popularize and apply the technical scheme that this application provided.
It should be noted that, the processes or steps which are not described or limited in the preparation process of the cylindrical battery cell with all the tabs can be set according to the conventional selection in the field.
In a second aspect, an embodiment of the present application provides a full-tab cylindrical electrical core, which is manufactured by using a method for manufacturing a full-tab cylindrical electrical core as provided in the embodiment of the first aspect.
It will be appreciated that the dimensions of the conductive adhesive layers in the respective regions may be defined in view of manufacturing costs and the function of the conductive adhesive layers in the different regions of the tab.
As an example, in the first preset direction, the exposed portion of the conductive adhesive layer on the tab of the next layer has a size of 0.1 to 2 mm, for example, but not limited to, a value of any one point or a range between any two points of sizes of 0.1 mm, 0.5 mm, 1 mm, 1.5 mm and 2 mm; the first preset direction is the same as the width direction of the battery anode.
In this embodiment, the size of the exposed portion of the conductive adhesive layer is limited to a specific range, so that a relatively suitable flow guiding area can be provided, and thus relatively good conductive performance can be provided.
As an example, the size of the portion of the conductive adhesive layer on the tab of the next layer that is blocked by the tab of the next upper layer is 0.1 to 2 mm, such as, but not limited to, any one or a range of values between any of the sizes 0.1 mm, 0.5 mm, 1 mm, 1.5 mm and 2 mm.
In this embodiment, the size of the shielded portion of the conductive adhesive layer is limited to a specific range, so that a suitable bonding area can be provided, and a good bonding fixing effect, a good conductive effect and a good heat conduction effect can be provided.
It should be noted that, the structures of the full-tab cylindrical battery cell, which are not specifically described or limited, may be selected according to the conventional options in the art.
In a third aspect, embodiments of the present application provide a battery, including a full tab cylindrical cell, an electrolyte, and a housing as provided in the embodiments of the second aspect; the full-lug cylindrical battery cell and the electrolyte are contained in the shell.
In a fourth aspect, an embodiment of the present application provides an electric device, including a full-tab cylindrical electric core as provided in an embodiment of the third aspect.
It should be noted that the electric equipment is not limited to the fields of electric automobiles, electric bicycles, ships, digital products, energy storage devices and the like.
The features and capabilities of the present application are described in further detail below in connection with the examples.
Example 1
The embodiment of the application provides a preparation method of a full-tab cylindrical battery cell, which comprises the following steps:
applying slurry of a conductive adhesive layer to tab areas of a battery positive electrode (aluminum positive electrode) and a battery negative electrode (copper negative electrode) by adopting a coating process to form the conductive adhesive layer, respectively applying active slurry to coating areas of the aluminum positive electrode and the copper negative electrode by adopting a coating process to form an active material layer (wherein the positive electrode active material is lithium iron phosphate and the negative electrode active material is graphite), and beveling the tab areas by adopting laser equipment according to the specification that the inclination angle is 45 degrees and the size of a single tab in a second preset direction is 4 mm to obtain the battery positive electrode and the battery negative electrode with the conductive adhesive layer; the paste composition of the conductive adhesive layer comprises PVDF (binder), carbon black (conductive agent) and NMP (solvent), the size of the conductive adhesive layer in the first preset direction is 2 mm, and the thickness of the conductive adhesive layer is 200 mu m.
The first diaphragm, the battery anode with the conductive adhesive layer, the second diaphragm and the battery cathode with the conductive adhesive layer are sequentially wound, shaped and flattened, so that the part of the conductive adhesive layer on the electrode lug of the next layer is positioned between two adjacent electrode lugs, and the rest conductive adhesive layer is exposed, thus obtaining a full-electrode lug cylindrical naked cell; the first diaphragm and the second diaphragm are PE diaphragms, the size of a leakage part of the conductive adhesive layer on the next-layer tab in the first preset direction is 1 mm, and the size of a part of the conductive adhesive layer on the next-layer tab, which is shielded by the adjacent upper-layer tab, in the first preset direction is 1 mm.
And providing a current collecting disc, assembling the current collecting disc and the full-lug cylindrical bare cell, so that the conductive adhesive layer of the exposed part is positioned between the lugs and the current collecting disc, and then, synchronously heating and solidifying in a subsequent cell baking process, so that the current collecting disc and the lugs are bonded through the conductive adhesive layer, and adjacent lugs on the upper layer and the lower layer are bonded through the conductive adhesive layer, thereby obtaining the full-lug cylindrical cell.
For the convenience of understanding the technical solution, an auxiliary explanation is made here by means of a schematic structural diagram, wherein fig. 3 shows a schematic structural diagram after winding, fig. 4 shows a schematic structural diagram after shaping, and fig. 5 shows a schematic structural diagram after flattening.
Comparative example 1
The comparative example of the application provides a preparation method of a full-tab cylindrical battery cell, which comprises the following steps:
and respectively applying active slurry in the coating areas of the aluminum anode and the copper cathode by adopting a coating process to form an active substance layer (wherein the anode active material is lithium iron phosphate and the cathode active material is graphite), and then chamfering the tab areas of the battery anode (aluminum anode) and the battery cathode (copper cathode) by adopting laser equipment according to the specification that the inclination angle is 45 degrees and the size of a single tab in a second preset direction is 4 mm, so as to obtain the battery anode and the battery cathode without a conductive adhesive layer.
Winding the first diaphragm, the beveled battery anode, the second diaphragm and the beveled battery cathode, and then applying a slurry of a conductive adhesive layer to the exposed area of each wound tab by adopting a coating process to form a conductive adhesive layer; the slurry of the conductive adhesive layer comprises PVDF (binder), carbon black (conductive agent) and NMP (solvent), the size of the formed conductive adhesive layer in the first preset direction is 1 mm, the thickness of the formed conductive adhesive layer is 200 mu m, and the first diaphragm and the second diaphragm are PE diaphragms.
And then shaping and leveling are sequentially carried out, so that the full-tab cylindrical bare cell is obtained.
And providing a current collecting disc, assembling the current collecting disc and the full-lug cylindrical bare cell so that the conductive adhesive layer of the exposed part is positioned between the lug and the current collecting disc, and then synchronously heating and solidifying in a subsequent cell baking process so that the current collecting disc and the lug are bonded through the conductive adhesive layer to obtain the full-lug cylindrical cell.
Test examples
Performance test of full-lug cylindrical battery cell
The testing method comprises the following steps:
the preparation of the full-tab cylindrical battery cell was performed according to the preparation processes of example 1 and comparative example 1, and then the obtained full-tab cylindrical battery cell was numbered, and then the drawing force of the tab and the current collecting plate of each sample, the impedance of the full-tab cylindrical battery cell, and the overcurrent capacity of the full-tab cylindrical battery cell were tested.
TABLE 1 Performance test results of full tab cylindrical cells
Referring to table 1, as shown in the test results of example 1 and comparative example 1, compared with the existing preparation process of the full-tab cylindrical battery cell, the impedance performance of the full-tab cylindrical battery cell provided by the embodiment of the present application is basically consistent with that of the full-tab cylindrical battery cell, and in the full-tab cylindrical battery cell corresponding to the former, since the conductive adhesive layer is also present between the adjacent tabs of the upper layer and the lower layer, the drawing force and the overcurrent capacity of the tab and the current collecting disc in the full-tab cylindrical battery cell can be improved by virtue of the adhesive fixation and the conductivity.
The embodiments described above are some, but not all, of the embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Claims (15)
1. The preparation method of the full-lug cylindrical battery cell is characterized by comprising the following steps of:
providing a battery anode and a battery cathode with conductive adhesive layers, wherein the conductive adhesive layers are positioned on one side surface of the electrode lug and at one end far away from a coating area in the battery anode and the battery cathode;
the first diaphragm, the battery anode, the second diaphragm and the battery cathode are sequentially wound, shaped and flattened, so that the part of the conductive adhesive layer on the electrode lug on the next layer is positioned between two adjacent electrode lugs on the upper layer and the lower layer, and the rest part of the conductive adhesive layer is exposed, thus obtaining a full electrode lug cylindrical naked cell; and
and providing a current collecting disc, assembling the current collecting disc and the full-lug cylindrical bare cell so that the conductive adhesive layer of the exposed part is positioned between the lug and the current collecting disc, and then performing heat treatment so as to solidify and crosslink the conductive adhesive layer.
2. The method for manufacturing a full-tab cylindrical battery cell according to claim 1, wherein in the step of providing the battery positive electrode and the battery negative electrode with the conductive adhesive layer, the conductive adhesive layer is formed in the tab region of the battery positive electrode and the tab region of the battery negative electrode, respectively, and then the tab region of the battery positive electrode and the tab region of the battery negative electrode are beveled by using a laser device.
3. The method of claim 2, wherein applying the conductive paste during the forming of the conductive paste comprises at least one of spraying, coating, and sputtering.
4. The method for manufacturing the full-tab cylindrical cell according to claim 2, wherein in the chamfering process, the chamfering angle α is 30 ° to 60 °.
5. The method for manufacturing a full tab cylindrical cell according to claim 1, wherein pressure is applied to a blank area of a side of the tab where the conductive adhesive layer is provided in the shaping process, so that the tab is bent toward a side facing away from the conductive adhesive layer.
6. The method for manufacturing a full-tab cylindrical battery cell according to any one of claims 1 to 5, wherein in the battery positive electrode and the battery negative electrode, in a first preset direction, the size of the conductive adhesive layer is 10% -50% of the size of the tab, and the first preset direction is the same as the width direction of the battery positive electrode.
7. The method for manufacturing a full-tab cylindrical cell according to any one of claims 1 to 5, wherein the thickness of the conductive adhesive layer is 0.1 to 500 μm.
8. The method for manufacturing a full-tab cylindrical cell according to any one of claims 1 to 5, wherein the conductive agent in the conductive adhesive layer comprises at least one of an inorganic conductive agent and an organic conductive agent.
9. The method for manufacturing a full tab cylindrical cell according to claim 8, wherein the inorganic conductive agent comprises at least one of carbon black, nano silver and nano copper.
10. The method for preparing a full tab cylindrical cell according to claim 8, wherein the organic conductive agent comprises at least one of polypyrrole, polyaniline and polyacetylene.
11. A full-tab cylindrical cell, characterized in that it is manufactured by the method for manufacturing a full-tab cylindrical cell according to any one of claims 1 to 10.
12. The full-tab cylindrical battery cell according to claim 11, wherein in a first preset direction, a size of an exposed portion of the conductive adhesive layer on the tab of the next layer is 0.1-2 mm, and the first preset direction is the same as a width direction of the battery anode.
13. The full tab cylindrical cell according to claim 12, wherein a size of the tab shielding portion of the conductive adhesive layer located on the tab of the next layer by the adjacent upper layer is 0.1 to 2 mm.
14. A battery, comprising:
the full tab cylindrical cell of any one of claims 11-13;
an electrolyte; and
the shell, full utmost point ear cylinder electricity core with electrolyte all holds in the casing.
15. A powered device comprising the battery of claim 14.
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