CN115020650B - Preparation method of battery pole piece, battery pole piece and battery - Google Patents
Preparation method of battery pole piece, battery pole piece and battery Download PDFInfo
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- CN115020650B CN115020650B CN202210935512.1A CN202210935512A CN115020650B CN 115020650 B CN115020650 B CN 115020650B CN 202210935512 A CN202210935512 A CN 202210935512A CN 115020650 B CN115020650 B CN 115020650B
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
In order to solve the problems of insufficient preparation efficiency and high material cost in the existing preparation method of the pole piece, the invention provides a preparation method of a battery pole piece, which comprises the following operation steps: providing a pole piece master slice, wherein the pole piece master slice comprises a current collector and an active substance layer coated on the current collector; removing part of the active substance layer on the surface of the pole piece master slice to expose the current collector, and forming at least one first empty foil area; and cutting the pole piece master slice to cut the single first empty foil area into two tab accommodating areas which are positioned on different pole pieces and used for connecting tabs. The preparation method of the battery pole piece can completely avoid the generation of leftover materials between the adjacent pole pieces, thereby realizing the full utilization of the pole piece master slice and reducing the production cost.
Description
Technical Field
The invention belongs to the technical field of battery preparation, and particularly relates to a pole piece preparation method, a battery pole piece and a battery.
Background
With the development of scientific technology, electronic products are more and more introduced into the aspects of people's life, and the normal use of the electronic products cannot be separated from batteries, wherein lithium ion batteries are widely applied to electronic products in various fields because of the advantages of high energy density, environmental friendliness and the like, and the application of the lithium ion batteries in the field of electric vehicles is also spotlighted with the development of electric vehicle technology.
Lithium ion battery is usually coiled or laminated through the pole piece, and is provided with utmost point ear usually on the pole piece and realizes that the electricity is drawn forth, and current class pole piece structure, for realizing the make full use of mass flow body area, through the mode of getting rid of the active material layer of small part on the surface of mass flow body to form and be used for utmost point ear welded position, the preparation process of this kind of utmost point ear is comparatively troublesome, needs to prepare monolithic pole piece earlier, washs the operation of getting rid of the active material layer to monolithic pole piece again, and preparation efficiency is lower.
According to the existing improved preparation method, the whole pole piece is arranged, the plurality of first empty foil areas are arranged on the whole pole piece, the edge part of each first empty foil area is cut off by the aid of the multiple cutters, the cut edge part is leftover materials, and the rest part is the pole piece, so that the plurality of pole pieces are prepared simultaneously.
Disclosure of Invention
The invention provides a pole piece preparation method, a battery pole piece and a battery, aiming at the problems of insufficient preparation efficiency and high material cost in the existing pole piece preparation method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
on one hand, the invention provides a preparation method of a battery pole piece, which comprises the following operation steps:
providing a pole piece master slice, wherein the pole piece master slice comprises a current collector and an active substance layer coated on the current collector;
removing part of the active substance layer on the surface of the pole piece master slice to expose the current collector, and forming at least one first empty foil area;
and cutting the pole piece master slice so as to cut the first empty foil area into two pole lug accommodating areas which are positioned on different pole pieces and used for connecting pole lugs.
Optionally, in the operation of removing the active material layer, removing the active material layer on at least part of the surface of the pole piece master sheet along a first direction of the pole piece master sheet to expose the current collector, so as to form at least one first empty foil area;
in the cutting operation, follow the second direction of pole piece master slice cuts the pole piece master slice, obtains a plurality of pole pieces and with single first empty foil district cuts into two utmost point ear holding districts that are used for connecting utmost point ear, cuts two utmost point ear holding districts that obtain and lie in two adjacent pole pieces respectively, first direction with the second direction is perpendicular.
Optionally, in the operation of removing the active material layer, removing part of the active material layer in the spacing area along the first direction of the pole piece master sheet to expose the current collector, and forming a plurality of first empty foil areas spaced along the first direction;
in the cutting operation, the pole piece master slice is cut in the second direction corresponding to the positions of the first empty foil areas, and the pole piece master slice is cut in the positions between the two adjacent empty foil areas along the second direction to obtain a plurality of pole pieces.
Optionally, the slitting operation further includes slitting the edge position of the pole piece master in a second direction of the pole piece master.
Optionally, a central point of the pole piece master in the first direction is used as a base point, a single first empty foil area is arranged, and then the first empty foil area located at the central point is used as a center to symmetrically arrange other first empty foil areas.
Optionally, a central point of the pole piece master slice in the first direction is used as a base point, and a plurality of first empty foil areas are symmetrically arranged on two sides of the central point.
Optionally, the cutting operation of the pole piece master slice cuts by arranging a plurality of cutters, and the cutters are arranged on the cutters at intervals.
Optionally, both side surfaces of the current collector are coated with the active substance layer, and a part of the active substance layer is removed on the surface of one side of the pole piece mother sheet to expose the current collector, so as to form the first empty foil area.
Optionally, the active material layers are coated on both side surfaces of the current collector, a part of the active material layer is removed from one side surface of the pole piece mother sheet to expose the current collector, so as to form the first empty foil area, and a part of the active material layer is removed from the other side surface of the pole piece mother sheet corresponding to the first empty foil area to expose the current collector, so as to form a second empty foil area; in the cutting operation, the second empty foil area is cut into two blank avoiding areas which are not connected with the lugs, and the preparation method of the battery pole piece further comprises the following operations:
and ultrasonically welding a tab in the tab accommodating area.
Optionally, the lengths of the two tab receiving areas cut from the single first empty foil area are L1 and L2, respectively, and L1 and L2 satisfy the following condition:
optionally, the following operations are also included:
and the lug is electrically connected in the lug accommodating area in a welding and/or conductive adhesive bonding mode.
Optionally, the width of the tab is L3, the width of the tab receiving area is L4, and L3 and L4 satisfy the following condition:
1.5*L3≤L4≤3.5*L3。
optionally, the length of the overlapping portion between the tab and the tab receiving area is L5, the length of the tab receiving area is L6, and L5 and L6 satisfy the following conditions:
0.5mm≤L6-L5≤10mm。
optionally, the first empty foil area is of a polygonal structure, a joint of each two adjacent sides of the polygonal structure is a fillet, and a radius R of the fillet is greater than or equal to 1mm and less than or equal to 5mm.
Optionally, the pole piece master slice is prepared by the following method:
and coating active substance slurry on the surface of the current collector, and drying to remove the solvent to obtain the pole piece master slice.
Optionally, the removing manner of the active material layer on the first empty foil area includes one or more of laser cleaning, foam cleaning and mechanical cleaning.
In another aspect, the invention provides a battery pole piece, which is prepared by the above preparation method of the battery pole piece.
In yet another aspect, the invention provides a battery comprising a battery pole piece as described above.
According to the preparation method of the battery pole piece, the pole piece is prepared in a whole pole piece master piece slitting mode, meanwhile, part of active substance layers on a current collector are removed before slitting operation to form a first empty foil area, a plurality of pole pieces with the pole lug accommodating areas can be obtained through single removal and single slitting, and the active substance layer removing work of the pole lug accommodating areas is not needed to be carried out on the single pole piece after the pole piece is prepared, so that the process preparation flow is simplified, the production efficiency of the pole piece is greatly improved, especially, the preparation method is in a setting mode that the single first empty foil area is divided into two pole lug accommodating areas in the slitting operation, the generation of leftover materials between the adjacent pole pieces can be completely avoided, the full utilization of the pole piece master piece is realized, and the production cost is reduced.
Drawings
FIG. 1 is a schematic view of the arrangement of a first empty foil area on a pole piece master provided by the present invention;
FIG. 2 is a schematic diagram of the arrangement of a first tangent line and a second tangent line on a pole piece mother plate provided by the present invention;
FIG. 3 is a schematic structural diagram of a pole piece on one side of a first slit line after slitting provided by the present invention;
FIG. 4 is a schematic structural diagram of a pole piece on the other side of the first slit line after slitting provided by the present invention;
FIG. 5 isbase:Sub>A view of the cross section A-A of FIG. 3;
FIG. 6 isbase:Sub>A view of the cross section A-A of FIG. 3;
FIG. 7 is an alternative shape embodiment of the first void foil area provided by the present invention;
FIG. 8 is an alternative shape embodiment of the first void foil area provided by the present invention;
FIG. 9 is an alternative shape embodiment of the first void foil area provided by the present invention;
FIG. 10 is an alternative shape embodiment of the first void foil area provided by the present invention;
fig. 11 is a schematic view of the connection between the pole piece and the tab provided by the present invention.
The reference numbers in the drawings attached hereto are as follows:
1. a pole piece master slice; 11. a first empty foil region; 111. a tab accommodating area; 12. a blank avoidance area; 13. an active material layer; 14. a current collector; 2. a first tangent line; 3. a second tangent line; 4. pole pieces; 5. a tab; 6. leftover materials; 7. the third tangent.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be understood that the terms "first direction", "second direction", "length direction", "width direction", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to 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 invention, "a plurality" means two or more unless otherwise specified.
Referring to fig. 1 to 4, an embodiment of the present invention provides a method for manufacturing a battery pole piece, including the following steps:
providing a pole piece master slice 1, wherein the pole piece master slice 1 comprises a current collector 14 and an active substance layer 13 coated on the current collector 14;
removing part of the active substance layer 13 on the surface of the pole piece master slice 1 to expose the current collector 14, and forming at least one first empty foil area 11;
and cutting the pole piece master slice 1 to cut the single first empty foil area 11 into two tab accommodating areas 111 which are positioned on different pole pieces 4 and used for connecting tabs.
In the preparation method, the pole pieces 4 are prepared in a mode of slitting the whole pole piece master slice 1, meanwhile, partial active substance layers 13 on the current collector 14 are removed before slitting operation to form the first empty foil area 11, a plurality of pole pieces 4 with the pole lug accommodating areas 111 can be obtained by single removal and single slitting, and the active substance layers 13 in the pole lug accommodating areas 111 do not need to be removed from the single pole piece 4 after the pole pieces 4 are prepared, so that the process preparation flow is simplified, the production efficiency of the pole pieces 4 is greatly improved, especially, the preparation method cuts the single first empty foil area 11 in the slitting operation to form the arrangement mode of the two pole lug accommodating areas 111, the generation of leftover materials between the adjacent pole pieces 4 can be completely avoided, the full utilization of the pole piece master slice 1 is realized, and the production cost is reduced.
In some embodiments, in the operation of removing the active material layer, the active material layer 13 on at least a part of the surface of the pole piece mother sheet 1 is removed along a first direction of the pole piece mother sheet 1 to expose the current collector 14 to expose the current collector, so as to form at least one first empty foil area 11;
in the cutting operation, follow the second direction of pole piece master slice 1 cuts pole piece master slice 1, obtains a plurality of pole pieces 4 and with single first empty paper tinsel district 11 is cut into two utmost point ear holding districts 111 that are used for connecting the utmost point ear, cuts two utmost point ear holding districts 111 that obtain and lie in two adjacent pole pieces 4 respectively, first direction with the second direction is perpendicular.
In the description of the present invention, the term "first direction" and the term "second direction" may be set according to the specific shape of the pole piece master 1, and the technical solution of the present application may be implemented only by ensuring that the "first direction" and the "second direction" are perpendicular to each other, in some embodiments, in order to ensure that the pole piece master 1 is fully utilized and the generation of leftover materials is reduced, the pole piece master 1 is in a rectangular sheet structure, the first direction is the width direction of the pole piece master 1, and the second direction is the length direction of the pole piece master 1, so as to facilitate the cutting of the strip-shaped pole pieces 4, and the cut pole pieces 4 may be directly applied, thereby reducing the subsequent processing on the shape of the pole pieces 4.
The position of the first empty foil area 11 in the second direction on the pole piece master 1 may be set according to the position of the pole piece 4 where the tab 5 needs to be drawn out, for example, in some embodiments, when the tab 5 needs to be drawn out at the end position near one side, the middle position, or the end position near the other side of the pole piece 4, a part of the active material layer 13 may be removed at a position corresponding to the front section, the middle section, or the rear section of the pole piece master 1 in the second direction to form the first empty foil area 11.
When a plurality of tabs 5 are led out from a single pole piece 4, a plurality of tab accommodating areas 111 need to be arranged on the single pole piece 4, in some embodiments, the first empty foil areas 11 may be arranged in multiple groups, each group includes at least one first empty foil area 11, and each group of first empty foil areas 11 is arranged at intervals along the second direction, and is cut along the second direction to form a plurality of tab accommodating areas 111 on the single pole piece 4.
In some embodiments, in the slitting operation, the pole piece mother sheet 1 is slit into two pole pieces 4 by performing a single slitting along the second direction.
In some embodiments, in the operation of removing the active material layer, part of the active material layer 13 is removed in the spacing region along the first direction of the pole piece mother sheet 1 to expose the current collector 14, and a plurality of first empty foil regions 11 spaced along the first direction are formed;
in the cutting operation, the pole piece master slice 1 is cut in the second direction corresponding to the positions of the first empty foil areas 11, and the pole piece master slice 1 is cut in the second direction between the two adjacent first empty foil areas 11 to obtain a plurality of pole pieces 4.
Through forming a plurality of empty foil district 11 in the first direction at intervals, correspond and carry out the cutting of second direction in the position in a plurality of empty foil district 11, and along the second direction adjacent two the position is right between the empty foil district 11 of first pole piece master slice 1 cuts to realize once cutting and obtain 3 or above pole piece 4, can effectively improve the machining efficiency of pole piece 4. As shown in fig. 2, the first tangent line 2 corresponds to the position where the first empty foil area 11 is aligned with the pole piece master slice to be cut in the second direction, the second tangent line 3 is aligned between the first empty foil areas to be cut in the second direction, and the second tangent line 3 equally divides the area between the first tangent lines 2. The distance between the first tangent line 2 and the second tangent line 3 is the length of the pole piece 4 (the width of the pole piece 4) in the first direction after slitting.
The edge part of the pole piece master slice 1 has a part which is not uniformly covered by an active material layer due to the reasons of a coating process and the like, and in order to avoid the influence of the edge part of the pole piece master slice 1 on the quality of a formed pole piece 4, the edge part of the pole piece master slice 1 needs to be cut off in the slitting operation; specifically, in some embodiments, the slitting operation further includes that the second direction of the pole piece master slice is used for slitting the edge position of the pole piece master slice, the specific slitting position is as shown by a third slitting line 7 in fig. 2, the third slitting line 7 is adjacent to the first slitting line 2, and the pole piece 4 is obtained by slitting the third slitting line 7 and the edge of the pole piece master slice 1 to obtain the leftover material 6.
In some embodiments, when the length of the pole piece master 1 in the first direction is not equal to the integral multiple of the width of the pole piece 4, the edge position of the pole piece master 1 is also slit to remove the redundant part.
In some embodiments, when the active material layer at the edge portion of the pole piece mother sheet 1 is uniformly covered, for example, when the pole piece mother sheet 1 is obtained by cutting a larger mother sheet, and the length of the pole piece mother sheet 1 in the first direction is designed to be an integral multiple of the width of the pole piece 4, the edge portion of the pole piece mother sheet 1 may not be cut, and the pole piece mother sheet 1 is directly cut corresponding to the first empty foil area and optionally a position between adjacent first empty foil areas.
When the number of the first empty foil areas 11 in the first direction is an odd number, in some embodiments, a central point of the pole piece master 1 in the first direction is used as a base point to set a single first empty foil area 11, and then the first empty foil areas 11 located at the central point are used as center symmetry to set other first empty foil areas 11.
When the number of the first empty foil areas 11 in the first direction is even, in some embodiments, a plurality of first empty foil areas 11 are symmetrically disposed on two sides of a center point of the pole piece master 1 in the first direction as a base point.
In some embodiments, the pole piece master 1 may be cut by a cutter, or by laser cutting, or by other devices that can perform the cutting operation.
In some embodiments, the pole piece master slice 1 is cut by a multi-cutter device, and a plurality of cutters are arranged on the multi-cutter device at intervals. The cutters are arranged at positions corresponding to the first tangent line 2, the second tangent line 3 and the third tangent line 7.
Realize once only cutting the purpose that obtains a plurality of pole pieces 4 through setting up a plurality of cutters, at the in-process of once cutting, cut between two adjacent cutters and be formed with single pole piece 4, need not cut many times, effectively improved production efficiency, adjacent two the interval of cutter does first graticule 2 with interval between the second graticule 3 also equals with pole piece 4's width simultaneously, and interval between two adjacent cutters of accessible control is with control first graticule 2 with the position of second graticule 3, and then adjusts pole piece 4's width.
As shown in fig. 5, in some embodiments, both side surfaces of the current collector 14 are coated with the active material layer 13, and a portion of the active material layer 13 is removed on a single side surface of the pole piece master 1 to expose the current collector 14, so as to form the first empty foil region 11.
In a conventional operation, as shown in fig. 5, a first empty foil area 11 is provided on one side surface of the pole piece mother sheet 1, and is feasible in most embodiments, for example, when the connection manner of the tab 5 and the tab receiving area 111 is ultrasonic welding, a problem of cold joint may occur in the manner of providing the first empty foil area 11 on one side surface of the pole piece mother sheet 1, and the inventor finds through experiments that the active material layer 13 on the other side of the pole piece mother sheet 1 is related to the problem of cold joint caused by ultrasonic welding, as a further improvement of the present preparation method, as shown in fig. 6, in some embodiments, both side surfaces of the current collector 14 are coated with the active material layer 13, a part of the active material layer 13 is removed on one side surface of the pole piece mother sheet 1 to expose the current collector 14, so as to form the first empty foil area 11, and a part of the active material layer 13 is removed on the other side surface of the pole piece mother sheet 1 corresponding to the first empty foil area to expose the current collector 14, so as to form a second empty foil area; in the cutting operation, the second empty foil area is cut into two blank avoiding areas 12 which are not connected with the lugs, and the preparation method of the battery pole piece further comprises the following operations:
and ultrasonically welding a tab in the tab accommodating area 111.
Through being formed with the empty paper tinsel district of first empty paper tinsel district 11 and second respectively on the both sides surface at pole piece master 1, and make 1 both sides surface of pole piece master first empty paper tinsel district 11 with the position in the empty paper tinsel district of second corresponds the setting, is favorable to improving the welding yield when utmost point ear 5 carries out ultrasonic bonding in utmost point ear holding district 111, and its reason is owing to dodge the active substance layer 13 of district 12 through getting rid of utmost point ear holding district 111 in the blank of the 14 opposite sides of mass flow body, is favorable to making the mass flow body 14 produce stronger vibration effect under the ultrasonic wave effect, and then is favorable to the relative friction heat production between utmost point ear 14 and the utmost point ear 5, and then has avoided the problem of utmost point ear 5 rosin joint, improves the coupling effect between utmost point ear 5 and the mass flow body 14, reduces the contact resistance in utmost point ear 5 position.
It should be noted that, "removing the active material layer at a position corresponding to the first empty foil area on the other side surface of the pole piece mother sheet to form the second empty foil area" should be understood in a broad sense, that is, the positions of the first empty foil area and the second empty foil area approximately correspond to each other, and when the positions of the first empty foil area and the second empty foil area are misaligned to some extent, but a projection overlapping portion remains on the current collector, the positions of the first empty foil area and the second empty foil area may also be considered to be corresponding, or the shapes of the first empty foil area and the second empty foil area are not consistent, but a projection overlapping portion remains on the current collector, and the positions of the first empty foil area and the second empty foil area may also be considered to be corresponding.
In some embodiments, the second empty foil regions are shaped and prepared in a manner consistent with the first empty foil regions 11.
As shown in fig. 2, in some embodiments, the lengths of the two tab receiving areas 111 obtained by cutting the first empty foil area 11 are L1 and L2, and L1 and L2 satisfy the following condition:
by limiting the L1 and the L2 to be in the relation condition, the overlarge size difference of the two tab accommodating areas 111 caused by the fluctuation of mechanical equipment in the slitting process can be avoided, and the consistency of products can be improved.
In a specific embodiment, L1 and L2 are lengths of the tab receiving area 111 in the first direction.
As shown in fig. 11, in some embodiments, the method for preparing the battery pole piece 4 further comprises the following operations:
and the tab 5 is electrically connected in the tab accommodating area 111, and the electrical connection mode of the tab 5 comprises welding and/or conductive adhesive bonding.
In various embodiments, the welding comprises one or more of ultrasonic welding, laser welding, arc welding, gas welding, thermite welding, electroslag welding, electron beam welding, resistance spot seam welding, explosion welding, flame brazing, induction brazing, furnace brazing, salt brazing, and electron beam brazing.
In some embodiments, the width of the tab 5 is L3, the width of the tab receiving area 111 is L4, and L3 and L4 satisfy the following condition:
1.5*L3≤L4≤3.5*L3。
when the width L4 of the tab accommodating area 111 meets the above conditions, on one hand, an enough area for connection of the tab 5 is provided, and the width L4 of the tab accommodating area 111 is set to be larger than the width L3 of the tab 5, so that the problem of inaccurate alignment caused by errors of processing equipment can be reduced, and the product yield is improved; on the other hand, the influence on the energy density of the battery caused by the overlarge tab accommodating area 111 is avoided, and the loss of the active material layer 13 is reduced.
In a specific embodiment, L3 is a width of the tab 5 in the second direction, and L4 is a width of the tab receiving area 111 in the second direction.
In some embodiments, the length of the overlapping portion of the tab 5 and the tab receiving area 111 is L5, the length of the tab receiving area 111 is L6, and L5 and L6 satisfy the following condition:
0.5mm≤L6-L5≤10mm。
by making the difference between the length L6 of the tab receiving area 111 and the length L5 of the overlapping portion of the tab 5 and the tab receiving area 111 satisfy the above condition, an enough area can be left for connecting the tab 5 and the tab receiving area 111, and a certain error adaptability is provided; meanwhile, the influence on the energy density of the battery caused by the overlarge tab accommodating area 111 is avoided, and the loss of the active material layer 13 is reduced.
In a specific embodiment, L5 is a length of an overlapping portion of the tab 5 and the tab receiving area 111 in the first direction, and L6 is a length of the tab receiving area 111 in the first direction.
In different embodiments, the first empty foil area 11 may be of different shapes.
As shown in fig. 1 and 2, in an embodiment, the first empty foil area 11 is rectangular, and the first empty foil area 11 is divided into two rectangular tab receiving areas 111 by the first dividing line 2.
As shown in fig. 7, in an embodiment, the first empty foil area 11 has a polygonal structure, and the first empty foil area 11 is divided into two trapezoidal tab receiving areas 111 by the first dividing line 2.
As shown in FIGS. 8 and 10, in some embodiments, the first empty foil area 11 is a polygonal structure, the corner positions of the polygonal structure are rounded corners, and the radius R of the rounded corners satisfies 1mm ≦ R ≦ 5mm.
The angular positions of the polygonal structures are set to be round corners, so that the stress of the pole pieces 4 at the corners of the polygonal structures can be reduced, and the problem that the pole pieces 4 are broken in the slitting process is avoided. When the radius R of the fillet is within the range of R being more than or equal to 1mm and less than or equal to 5mm, the stress at the fillet is more uniform.
Specifically, the first empty foil area 11 in fig. 8 is a quadrangle, and the first empty foil area 11 in fig. 10 is a hexagon.
In one embodiment, as shown in fig. 9, the first empty foil area 11 is racetrack shaped.
When the first empty foil area 11 is racetrack shaped, the length L6 of the tab receiving area 111 in the first direction refers to the length of the tab receiving area 111 in the first direction, excluding the length of the end arc portion thereof in the first direction.
In some embodiments, the pole piece master 1 is prepared by the following method:
and coating active material slurry on the surface of the current collector 14, and drying to remove the solvent to obtain the pole piece master slice 1.
The active material slurry comprises a solvent, a conductive agent, a binder and an active material, wherein the conductive agent is selected from one or more of conductive carbon black, conductive carbon spheres, conductive graphite, conductive carbon fibers, carbon nanotubes, graphene or reduced graphene oxide; the binder is selected from thermoplastic resins such as polyvinylidene fluoride, copolymers of vinylidene fluoride, polytetrafluoroethylene, copolymers of vinylidene fluoride and hexafluoropropylene, copolymers of tetrafluoroethylene and perfluoroalkyl vinyl ether, copolymers of ethylene and tetrafluoroethylene, copolymers of vinylidene fluoride and trifluoroethylene, copolymers of vinylidene fluoride and trichloroethylene, copolymers of vinylidene fluoride and fluoroethylene, copolymers of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene, thermoplastic polyimide, polyethylene, polypropylene and the like; an acrylic resin; sodium carboxymethylcellulose; and styrene butadiene rubber; the solvent is water or a non-aqueous solvent; when the prepared pole piece 4 is a positive pole, the active substance is selected from lithium iron phosphate, lithium cobaltate, lithium manganate, a nickel cobalt manganese ternary material or a nickel cobalt aluminum ternary material; when the prepared pole piece 4 is a negative electrode, the active substance is selected from a carbon-based material, a silicon-based material or a tin-based material.
In some embodiments, the removing manner of the active material layer 13 on the first empty foil region 11 includes one or more of laser cleaning, foam removal, pressure sensitive adhesive paper removal, solvent cleaning, and mechanical cleaning.
The laser cleaning is to remove the active material layer 13 on the first empty foil area 11 by ablation with a high-power laser.
The foam adhesive is attached to the position of first hollow foil region 11 by a foam adhesive before active material layer 13 is coated, and after active material layer 13 is coated, the foam adhesive is foamed before or after active material layer 13 is dried, so that active material layer 13 at the position is lifted up and removed, and the foam adhesive is removed, thereby obtaining first hollow foil region 11 without active material layer 13.
The pressure-sensitive adhesive paper is removed by a method similar to that of removing the foaming adhesive, and the difference is that the foaming adhesive is replaced by the pressure-sensitive adhesive paper, the pressure-sensitive adhesive paper is rolled under the action of pressure so as to peel off the active material layer 13 on the top of the pressure-sensitive adhesive paper, and the pressure-sensitive adhesive paper is removed to obtain the first empty foil area 11 without the active material layer 13.
The solvent cleaning is performed by applying a solvent to the first empty foil region 11 to soften the active material layer 13 of the first empty foil region 11 and removing the same by means of a doctor blade or the like.
The mechanical cleaning is a direct removing operation of the active material layer 13 in the first empty foil region 11 by means of a doctor blade, a bonding roll, or the like.
Another embodiment of the invention provides a battery pole piece, which is prepared by the above preparation method of the battery pole piece.
In some embodiments, the battery tab is a positive or negative tab.
Another embodiment of the present invention provides a battery comprising a battery pole piece as described above.
In some embodiments, the battery is a pouch battery or a hard-shell battery.
In some embodiments, the battery is a primary battery or a secondary battery.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (14)
1. A preparation method of a battery pole piece is characterized by comprising the following operation steps:
providing a pole piece master slice, wherein the pole piece master slice comprises a current collector and an active substance layer coated on the current collector;
the active substance layers are coated on the surfaces of the two sides of the current collector, part of the active substance layers are removed from the surface of one side of the pole piece master slice to expose the current collector, a first empty foil area is formed, the first empty foil area is of a polygonal structure, the joint of each two adjacent sides of the polygonal structure is a fillet, and the radius R of the fillet is more than or equal to 1mm and less than or equal to 5mm;
removing part of the active material layer on the other side surface of the pole piece master slice corresponding to the first empty foil area to expose the current collector, and forming a second empty foil area;
cutting the pole piece master slice to cut a single first empty foil area into two tab accommodating areas which are positioned on different pole pieces and used for connecting tabs, and cutting a second empty foil area into two blank avoiding areas which are not connected with the tabs;
the preparation method of the battery pole piece also comprises the following operations:
and ultrasonically welding a tab in the tab accommodating area.
2. The preparation method of the battery pole piece according to claim 1, wherein in the operation of removing the active material layer, the active material layer on at least part of the surface of the pole piece master piece is removed along a first direction of the pole piece master piece to expose the current collector, so as to form at least one first empty foil area;
in the slitting operation, cut the pole piece master slice along the second direction of pole piece master slice, obtain a plurality of pole pieces and with single first empty foil district cuts into two utmost point ear holding districts that are used for connecting utmost point ear, cuts two utmost point ear holding districts that obtain and lie in two adjacent pole pieces respectively, first direction with the second direction is perpendicular.
3. The preparation method of the battery pole piece according to claim 2, wherein in the operation of removing the active material layer, a part of the active material layer is removed in an interval area along a first direction of the pole piece mother piece to expose a current collector, and a plurality of first empty foil areas are formed at intervals along the first direction;
and in the cutting operation, cutting the pole piece master slice in a second direction at the positions of the plurality of first empty foil areas correspondingly, and cutting the pole piece master slice at the position between two adjacent first empty foil areas along the second direction to obtain a plurality of pole pieces.
4. The method of claim 2 or 3, further comprising cutting the edge of the master sheet along the second direction.
5. The method for preparing a battery pole piece according to claim 3, wherein a central point of the pole piece master piece in the first direction is used as a base point, a single first empty foil area is arranged, and the other first empty foil areas are symmetrically arranged by taking the first empty foil area positioned at the central point as a center.
6. The preparation method of the battery pole piece as claimed in claim 3, wherein a central point of the pole piece mother piece in the first direction is used as a base point, and a plurality of first empty foil areas are symmetrically arranged on two sides of the central point.
7. The method for preparing the battery pole piece according to claim 1, wherein the cutting operation of the pole piece mother piece is performed by arranging a multi-cutter device, and a plurality of cutters are arranged on the multi-cutter device at intervals.
8. The preparation method of the battery pole piece as claimed in claim 1, wherein the lengths of the two tab receiving areas obtained by cutting the single first empty foil area are L1 and L2, respectively, and L1 and L2 satisfy the following conditions:
0≤|(L1-L2)/L2*100％|≤10％。
9. the preparation method of the battery pole piece as claimed in claim 1, wherein the width of the tab is L3, the width of the tab receiving area is L4, and L3 and L4 satisfy the following conditions:
1.5*L3≤L4≤3.5*L3。
10. the preparation method of the battery pole piece as claimed in claim 1, wherein the length of the overlapping part of the tab and the tab receiving area is L5, the length of the tab receiving area is L6, and L5 and L6 satisfy the following conditions:
0.5mm≤L6-L5≤10mm。
11. the preparation method of the battery pole piece according to claim 1, wherein the pole piece master slice is prepared by the following steps:
and coating active substance slurry on the surface of the current collector, and drying to remove the solvent to obtain the pole piece master slice.
12. The preparation method of the battery pole piece, according to claim 1, wherein the removing mode of the active material layer on the first empty foil area comprises one or more of laser cleaning, foam rubber cleaning and mechanical cleaning.
13. A battery pole piece, characterized by being prepared by the method of any one of claims 1 to 12.
14. A battery comprising the battery pole piece of claim 13.
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| CN216015424U (en) * | 2021-08-04 | 2022-03-11 | 惠州市豪鹏科技有限公司 | Pole piece and battery comprising same |
| CN114300751A (en) * | 2021-12-15 | 2022-04-08 | 惠州锂威新能源科技有限公司 | Multi-electrode ear lithium ion battery and preparation method thereof |
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| JPH0896802A (en) * | 1994-09-27 | 1996-04-12 | Sony Corp | Manufacture of secondary battery electrode |
| WO2018180019A1 (en) * | 2017-03-29 | 2018-10-04 | 株式会社村田製作所 | Method and device for producing secondary battery |
| CN112670436A (en) * | 2020-12-17 | 2021-04-16 | 惠州市豪鹏科技有限公司 | Preparation method of battery pole piece |
| CN112670435A (en) * | 2020-12-17 | 2021-04-16 | 惠州市豪鹏科技有限公司 | Preparation method of battery pole piece |
| CN112670437A (en) * | 2020-12-17 | 2021-04-16 | 惠州市豪鹏科技有限公司 | Preparation method of battery pole piece |
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| CN216015424U (en) * | 2021-08-04 | 2022-03-11 | 惠州市豪鹏科技有限公司 | Pole piece and battery comprising same |
| CN114300751A (en) * | 2021-12-15 | 2022-04-08 | 惠州锂威新能源科技有限公司 | Multi-electrode ear lithium ion battery and preparation method thereof |
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