CN112670435A - Preparation method of battery pole piece - Google Patents
Preparation method of battery pole piece Download PDFInfo
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- CN112670435A CN112670435A CN202011494699.3A CN202011494699A CN112670435A CN 112670435 A CN112670435 A CN 112670435A CN 202011494699 A CN202011494699 A CN 202011494699A CN 112670435 A CN112670435 A CN 112670435A
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- current collector
- active material
- material layer
- layer
- pole piece
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000003466 welding Methods 0.000 claims abstract description 31
- 238000005520 cutting process Methods 0.000 claims abstract description 30
- 239000011149 active material Substances 0.000 claims description 72
- 239000011248 coating agent Substances 0.000 claims description 22
- 238000000576 coating method Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 21
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000013543 active substance Substances 0.000 abstract description 9
- 239000003292 glue Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000006258 conductive agent Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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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
Abstract
The invention relates to a preparation method of a battery pole piece, wherein an active substance layer is coated on a current collector, and a first hollow-out area which is not covered by the active substance layer is formed at the position of the current collector in the active substance layer; cutting the current collector from the middle of the first hollow area to form a plurality of pole pieces; the first hollow area is cut into a first welding area for welding the tab. This kind of mode of cutting has also formed the first weld zone that is used for welding utmost point ear when cutting the mass flow body, through cutting the mass flow body from the middle of first fretwork district both realized cutting and have obtained the purpose of a plurality of utmost point sheet stocks promptly, also make simultaneously and have the first weld zone that need not reprocess on each utmost point sheet stock, compare with prior art, saved the cross cutting process, improved production efficiency, and cut the mass flow body from the middle of first fretwork district, can not form unnecessary leftover bits, save the material, the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a battery pole piece.
Background
Lithium ion batteries have been widely used in the product fields of mobile phones, notebook computers and the like, and the market demand is continuously expanding, and the performance index is higher and higher. The current market urgently needs a preparation process of a battery pole piece with high energy density, quick charge and discharge, low impedance and high manufacturing speed. As shown in fig. 1 and 2, in the conventional pole piece process, a plurality of active material regions are usually coated on a current collector 1 at intervals, and tabs 4 are welded at intervals 2' of the active material regions (i.e., the tabs are welded in empty foil regions near the ends of the active material regions after being cut into pole piece monomers).
On the basis of the traditional pole piece process, as shown in fig. 3, the position of the pole lug is moved to the middle of the active material layer to form an embedded pole lug position, so that the aims of improving high energy density, realizing quick charge and quick discharge and reducing resistance can be fulfilled. However, the production process of the existing pole piece embedded with the pole lug mainly comprises the following steps: as shown in fig. 3, a front slitting mother roll a with a welding hollow area 1 ' is formed, the front slitting mother roll a is slit to obtain a rear slitting pole piece b, an active material layer at the edge of the welding hollow area 1 ' in the rear slitting pole piece b is cut to obtain a rear die-cutting pole piece c, and a tab is welded in the welding hollow area 1 ' in the rear die-cutting pole piece c; according to the technical method, a die cutting station is required to be added to cut off the active material layer at the edge of the welding hollow area 1' in the pole piece b after cutting, the working procedure is complicated, and the production efficiency is low.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problem of low production efficiency when the pole piece is manufactured by adopting the existing production process of the pole piece with an embedded pole lug, the preparation method of the battery pole piece is provided.
In order to solve the technical problem, an embodiment of the present invention provides a method for preparing a battery pole piece, including: coating an active material layer on a current collector, and forming a first hollow area which is not covered by the active material layer on the current collector at a position in the active material layer;
cutting the current collector from the middle of the first hollow area to form a plurality of pole pieces; the first hollow area is cut into a first welding area for welding a tab.
Optionally, a plurality of the first hollow-out areas are arranged, and the first hollow-out areas are arranged along the width direction of the current collector;
the forming of the plurality of pole pieces specifically comprises the following steps: and cutting the current collector from the middle of the first hollow-out area along the length direction of the current collector and cutting the current collector from the space between the adjacent first hollow-out areas along the length direction of the current collector, so that a plurality of pole pieces with the first welding areas are formed.
Optionally, the current collector is cut along the length direction of the current collector between the adjacent first hollow-out regions, and the current collector specifically includes: and cutting the current collector along the length direction of the current collector from the middle position between the adjacent first hollow-out areas.
Optionally, before slitting the current collector from the middle of the first hollow-out area to form a plurality of pole pieces, the preparation method of the battery pole piece further comprises rolling the current collector coated with the active material layer.
Optionally, the coating of an active material layer on a current collector, and the formation of a first hollow area, which is not covered by the active material layer, at a position of the current collector within the active material layer specifically includes: presetting a first tab position on a first surface of a current collector;
sticking a first removing layer on the position of the first tab;
coating an active material layer on a first side of the current collector and coating the active material layer on the upper surface of the first removal layer;
and removing the first removal layer from the current collector, so as to form a first hollow area which is not covered by the active material layer on the first surface of the current collector.
Optionally, after removing the first removal layer from the current collector, presetting a second tab position on the second surface of the current collector, wherein the second tab position is aligned with the first tab position;
sticking a second removing layer on the position of the second tab;
coating an active material layer on the second surface of the current collector and coating the active material layer on the upper surface of the second removal layer;
removing the second removal layer from the current collector to form a second hollowed-out area which is not covered by the active material layer on the second surface of the current collector, so that the current collector is coated with the active material layer on both surfaces and has the first hollowed-out area and the second hollowed-out area.
Optionally, the first removing layer is made of pressure-sensitive adhesive paper, and the first removing layer falls off from the current collector when a certain pressure is applied to the first removing layer.
Optionally, the removing the first removal layer from the current collector specifically includes: pressing the first removing layer by a pressure device, so that the first removing layer is pressed and rolled up to form a peelable adhesive paper sheet;
and removing the rolled first removal layer from the current collector by a stripping mechanism.
Optionally, the pressure device has a pressure range of 500-.
Optionally, after the first surface of the current collector is coated with the active material layer and the active material layer is coated on the upper surface of the first removal layer, heating the current collector coated with the active material layer to solidify the active material layer.
According to the preparation method of the battery pole piece, provided by the embodiment of the invention, the active substance layer is coated on the current collector, and the first hollow-out area which is not covered by the active substance layer is formed at the position of the current collector in the active substance layer; the current collector is cut from the middle of the first hollow area to form a plurality of pole piece materials, and the first hollow area is cut into a first welding area for welding the pole lug.
Drawings
FIG. 1 is a schematic diagram of a conventional pole piece;
FIG. 2 is a schematic diagram of another view of the conventional pole piece of FIG. 1;
fig. 3 is a state diagram of raw material molding in each stage when the tab embedded pole piece is manufactured by the existing manufacturing process;
fig. 4 is a schematic structural view of an embedded pole piece of a tab manufactured by an embodiment of the invention;
fig. 5 is a schematic view of the tab embedded pole piece of fig. 4 from another perspective;
fig. 6 is a state diagram of raw material molding conditions in various stages when the battery pole piece manufacturing method provided by an embodiment of the invention is used for manufacturing a tab embedded pole piece.
The reference numerals in the specification are as follows:
1', welding the hollowed-out area; 2', the spacing of the active material regions; a. cutting the front mother roll; b. cutting the pole piece; c. die-cutting the pole piece;
1. a current collector;
2a, a first tangent line; 2b, a second tangent line;
3. an active material layer;
4. a tab;
5. a first hollowed-out area; 51. a first welding area;
6. a second hollowed-out area.
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.
The preparation method of the battery pole piece provided by the embodiment of the invention comprises the following steps:
s10: as shown in fig. 4 and 5, an active material layer 3 is coated on a current collector 1, and a first hollow-out region 5 not covered by the active material layer 3 is formed in a position of the current collector 1 within the active material layer 3.
S20: as shown in fig. 6, cutting the current collector 1 from the middle of the first hollow-out area 5 to form a plurality of pole pieces; the first hollow area 5 is cut into first welding areas 51 for welding the tab 4.
S30: a tab 4 is welded to the first welding region 51.
According to the preparation method of the battery pole piece, provided by the embodiment of the invention, the active substance layer 3 is coated on the current collector 1, and the first hollow-out area 5 which is not covered by the active substance layer 3 is formed at the position, located in the active substance layer 3, of the current collector 1; the current collector 1 is cut from the middle of the first hollow area 5 to form a plurality of pole pieces, and the first hollow area 5 is cut into the first welding area 51 for welding the pole lug 4, the current collector 1 is cut by the cutting method, and the first welding area 51 for welding the pole lug 4 is also formed at the same time, namely, the current collector 1 is cut from the middle of the first hollow area 5, so that the purpose of cutting to obtain a plurality of pole pieces is realized, and meanwhile, each pole piece is provided with the first welding area 51 which is not required to be processed again, compared with the prior art (as shown in figure 3, the prior art needs to add a die cutting process on a cut pole piece b to modify and process a welding hollow area 1 'for welding the pole lug 4 again, and the pole lug can be welded after cutting an active material layer at the edge of the welding hollow area 1' to obtain a die-cut pole piece c), so as to save the die cutting process, the production efficiency is improved, the current collector 1 is cut from the middle of the first hollow-out area 5, redundant leftover materials cannot be formed, materials are saved, and the cost is reduced.
In an embodiment, as shown in fig. 6, a plurality of the first hollow-out regions 5 are provided, and the first hollow-out regions 5 are arranged along a width direction of the current collector 1; at this moment, the forming of the plurality of pole pieces specifically comprises: and cutting the current collector 1 along the length direction of the current collector 1 from the middle of the first hollow-out area 5 and cutting the current collector 1 along the length direction of the current collector 1 from the space between the adjacent first hollow-out areas 5, so as to form a plurality of pole pieces with the first welding areas 51. Through setting up a plurality of first fretwork district 5, can cut out a plurality of utmost point sheet stocks at a mass flow body 1 and come out, improved production efficiency.
When first fretwork district 5 is provided with a plurality ofly, preferably, from adjacent follow between the first fretwork district 5 along the length direction of the mass flow body 1 cuts the mass flow body 1 specifically does: and cutting the current collector 1 along the length direction of the current collector 1 from the middle position between the adjacent first hollow-out areas 5. Preferably, the 5 intervals of a plurality of first fretwork district are the same for the pole piece material size that surely goes out is unified, is fit for batch production.
For example, as shown in fig. 6, the distance between adjacent first hollow-out areas 5 arranged in the width direction of the current collector and the distance between the first tangent line 2a and the second tangent line 2b are set according to the width of the current collector and the width of the pole piece material to be manufactured, the second tangent line 2b passes through the middle position of the first hollow-out area 5, the first hollow-out area 5 is preferably sized to form a first welding area 51 suitable for welding a tab after slitting, the width of the pole piece material after slitting is determined by the distance between the first tangent line 2a and the second tangent line 2b, and a plurality of pole piece materials meeting the width requirement can be manufactured by slitting the current collector 1 along the first tangent line 2a and the second tangent line 2 b. If a plurality of first hollow-out areas 5 are also arranged in the length of the current collector 1, the current collector 1 needs to be cut off along the direction perpendicular to the width direction of the current collector, and the specific position of the current collector 1 cut off along the direction perpendicular to the width direction of the current collector is arranged according to the length of the pole piece material to be cut off, so that the cut pole piece material meets the length requirement, and the distance between the first hollow-out areas 5 in the length direction of the current collector depends on the length requirement of the pole piece material to be manufactured.
In an embodiment, before step S20, that is, before the step of slitting the current collector 1 from the middle of the first hollow-out area 5 to form a plurality of electrode sheets, the method for preparing a battery electrode sheet further includes rolling the current collector 1 coated with the active material layer 3, wherein the thickness of the current collector coated with the active material layer can be rolled to a desired process thickness by the rolling.
In an embodiment, step S10 specifically includes that the coating of the active material layer 3 on the current collector 1, and the formation of the first hollow-out area 5 of the current collector 1, which is located in the active material layer 3 and is not covered by the active material layer 3, specifically includes:
s11: presetting a first tab position on a first surface of a current collector 1;
s12: sticking a first removing layer on the position of the first tab;
s13: coating an active material layer 3 on a first surface of the current collector 1 and coating the active material layer 3 on the upper surface of the first removal layer; when the manufactured pole piece is a positive pole piece, the active material layer 3 comprises lithium cobaltate, glue solution, conductive agent and solvent, wherein the lithium cobaltate can be replaced by lithium iron phosphate, lithium manganate or ternary materials, the glue solution can be PVDF (polyvinylidene fluoride) glue solution, the conductive agent can be carbon, and the solvent can be NMP (N-methyl pyrrolidone);
when the manufactured pole piece is a negative pole piece, the active material layer 3 includes graphite (wherein, graphite can also be replaced by silicon, silicon oxide, lithium titanate or other metal oxide negative pole active materials), a conductive agent, glue solution and a solvent, wherein, the conductive agent can adopt carbon, the glue solution can adopt CMC (sodium carboxymethylcellulose), and the solvent can adopt water. Preferably, the first surface of the current collector 1 and the first removal layer may be coated by a coater, so that coating efficiency is improved.
S14: and removing the first removal layer from the current collector 1, so as to form a first hollow area 5 which is not covered by the active material layer 3 on the first surface of the current collector 1.
In an embodiment, after step S14, that is, after removing the first removal layer from the current collector 1, step S15 is further included: presetting a second tab position on a second surface of the current collector 1, wherein the second tab position is aligned with the first tab position;
s16: sticking a second removing layer on the position of the second tab;
s17: coating an active material layer 3 on a second surface of the current collector 1 and coating the active material layer 3 on the upper surface of the second removal layer;
s18: removing the second removal layer from the current collector 1 to form a second hollow area 6 on the second surface of the current collector 1, which is not covered by the active material layer 3, so that the current collector 1 is coated with the active material layer 3 on both surfaces and has the first hollow area 5 and the second hollow area 6. After the first removal layer on the first surface of the current collector is removed, the second hollow-out area 6 (shown in fig. 4) is formed on the second surface of the current collector in the same way, so that the problem that the thickness of the lug position (the first lug position and the second lug position) is too thick due to the fact that the first removal layer and the second removal layer are arranged on the two surfaces of the current collector at the same time can be solved, and the problem that coating cannot be performed can be caused when the thickness is larger than the coating distance.
The specific manner of coating the active material layer 3 on the second surface of the current collector 1 and forming the second hollow-out region 6 is the same as the specific manner of coating the active material layer 3 on the first surface of the current collector 1 and forming the first hollow-out region.
In an embodiment, the first removal layer is made of pressure-sensitive adhesive paper, and the first removal layer falls off from the current collector 1 when a certain pressure is applied to the first removal layer. Specifically, the pressure-sensitive adhesive paper is pasted on the first tab position through a pasting mechanism. The pressure-sensitive adhesive paper is pasted on the first tab position through the pasting mechanism, so that the efficiency of pasting the pressure-sensitive adhesive paper can be improved.
In an embodiment, step S14 specifically includes that the removing the first removal layer from the current collector 1 specifically includes: step S141: pressing the first removing layer by a pressure device, so that the first removing layer is pressed and rolled up to form a peelable adhesive paper sheet;
s142: the rolled first removal layer is removed from the current collector 1 by a peeling mechanism.
Preferably, the pressure range of the pressure device is 500-3000N, and the rolling effect of the first removal layer is better.
In an embodiment, after step S13, namely, after the first surface of the current collector 1 is coated with the active material layer 3 and the active material layer 3 is coated on the upper surface of the first removal layer, step S19 is further included: the current collector 1 coated with the active material layer 3 is heated to solidify the active material layer 3. The heating temperature is mainly dependent on the material of active material layer 3, and is specifically selected according to the material of active material layer 3.
Preferably, the current collector 1 coated with the active material layer 3 is heated by an oven, and it should be noted that, during the heating process, the first removing layer is not foamed, rolled and expanded, and after the baking process is finished, the first removing layer is pressed by a pressing device, so that the first removing layer is rolled after being pressed to form a peelable adhesive paper sheet.
In one embodiment, after the pole pieces welded with the pole lugs are manufactured, the pole pieces are subjected to a winding process, and processes such as packaging, formation, voltage detection and the like are performed to manufacture the battery, but a laminated battery can also be manufactured through a lamination process.
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 (10)
1. A preparation method of a battery pole piece is characterized by comprising the following steps:
coating an active material layer on a current collector, and forming a first hollow area which is not covered by the active material layer on the current collector at a position in the active material layer;
cutting the current collector from the middle of the first hollow area to form a plurality of pole pieces; the first hollow area is cut into a first welding area for welding a tab.
2. The preparation method of the battery pole piece according to claim 1, wherein a plurality of first hollow-out areas are arranged, and the first hollow-out areas are arranged along the width direction of the current collector;
the forming of the plurality of pole pieces specifically comprises the following steps: and cutting the current collector from the middle of the first hollow-out area along the length direction of the current collector and cutting the current collector from the space between the adjacent first hollow-out areas along the length direction of the current collector, so that a plurality of pole pieces with the first welding areas are formed.
3. The preparation method of the battery pole piece according to claim 2, wherein the step of slitting the current collector along the length direction of the current collector from the adjacent first hollow-out areas is specifically as follows: and cutting the current collector along the length direction of the current collector from the middle position between the adjacent first hollow-out areas.
4. The method for preparing the battery pole piece according to claim 1, wherein before the step of slitting the current collector from the middle of the first hollow area to form a plurality of pole pieces, the method for preparing the battery pole piece further comprises the step of rolling the current collector coated with the active material layer.
5. The method for preparing the battery pole piece according to claim 1, wherein the step of coating an active material layer on a current collector, and forming a first hollow area which is not covered by the active material layer on the current collector at a position in the active material layer specifically comprises the steps of: presetting a first tab position on a first surface of a current collector;
sticking a first removing layer on the position of the first tab;
coating an active material layer on a first side of the current collector and coating the active material layer on the upper surface of the first removal layer;
and removing the first removal layer from the current collector, so as to form a first hollow area which is not covered by the active material layer on the first surface of the current collector.
6. The method for preparing the battery pole piece according to claim 5, further comprising presetting a second tab position on the second surface of the current collector after removing the first removal layer from the current collector, wherein the second tab position is aligned with the first tab position;
sticking a second removing layer on the position of the second tab;
coating an active material layer on the second surface of the current collector and coating the active material layer on the upper surface of the second removal layer;
removing the second removal layer from the current collector to form a second hollowed-out area which is not covered by the active material layer on the second surface of the current collector, so that the current collector is coated with the active material layer on both surfaces and has the first hollowed-out area and the second hollowed-out area.
7. The preparation method of the battery pole piece according to claim 5, wherein the first removal layer is made of pressure-sensitive adhesive paper, and the first removal layer falls off from the current collector when a certain pressure is applied to the first removal layer.
8. The method for preparing the battery pole piece according to claim 7, wherein the removing the first removal layer from the current collector specifically comprises: pressing the first removing layer by a pressure device, so that the first removing layer is pressed and rolled up to form a peelable adhesive paper sheet;
and removing the rolled first removal layer from the current collector by a stripping mechanism.
9. The method for preparing a battery pole piece according to claim 8, wherein the pressure range of the pressure device is 500-3000N.
10. The method for preparing the battery pole piece according to claim 5, wherein after the first surface of the current collector is coated with the active material layer and the active material layer is coated on the upper surface of the first removal layer, the method further comprises heating the current collector coated with the active material layer to solidify the active material layer.
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| CN202011494699.3A CN112670435A (en) | 2020-12-17 | 2020-12-17 | Preparation method of battery pole piece |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113241423A (en) * | 2021-04-30 | 2021-08-10 | 珠海冠宇电池股份有限公司 | Pole piece and preparation method thereof, and lithium ion battery |
| 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 |
| CN115020650A (en) * | 2022-08-05 | 2022-09-06 | 比亚迪股份有限公司 | Preparation method of battery pole piece, battery pole piece and battery |
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Cited By (4)
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| CN113241423A (en) * | 2021-04-30 | 2021-08-10 | 珠海冠宇电池股份有限公司 | Pole piece and preparation method thereof, and lithium ion battery |
| CN113241423B (en) * | 2021-04-30 | 2023-04-18 | 珠海冠宇电池股份有限公司 | Pole piece and preparation method thereof, and lithium ion battery |
| 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 |
| CN115020650A (en) * | 2022-08-05 | 2022-09-06 | 比亚迪股份有限公司 | Preparation method of battery pole piece, battery pole piece and battery |
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