CN112670437A - Preparation method of battery pole piece - Google Patents
Preparation method of battery pole piece Download PDFInfo
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- CN112670437A CN112670437A CN202011494719.7A CN202011494719A CN112670437A CN 112670437 A CN112670437 A CN 112670437A CN 202011494719 A CN202011494719 A CN 202011494719A CN 112670437 A CN112670437 A CN 112670437A
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- current collector
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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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Abstract
The invention relates to a preparation method of a battery pole piece, which comprises the following steps: 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 surface of a current collector, wherein the active material layer passes through the upper surface of a first removal layer, and the edge part of the first removal layer is exposed out of the active material layer to form a first exposed part; and applying external force to the first exposed part to strip the first removal layer from the current collector, so that a first hollow area which is used for welding the tab and is not covered by the active substance layer is formed on the first surface of the current collector. The first hollowed-out area manufactured in the mode is in an open state at the edge, the lug can be directly welded on the first hollowed-out area, the active substance layer at the edge of the first hollowed-out area is not required to be cut by increasing a die cutting station, the manufacturing process is reduced, the production efficiency is improved, the cost is reduced, and the problem of damage to the current collector possibly caused by the die cutting process is also solved.
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
With the wide application of lithium ion batteries in electronic devices such as mobile phones and notebook computers, the market demand of the lithium ion batteries is increasing, and the performance requirements of the lithium ion batteries are also increasing at present, so the preparation process of the battery pole piece with high energy density, fast charge and fast discharge, low impedance and high manufacturing speed is the most urgent requirement of the current market, as shown in fig. 1 and fig. 2, the traditional pole piece process usually coats a plurality of active material areas on a current collector 1 at intervals, and the pole lugs 4 are welded at the intervals 2 'of the active material areas (namely, the pole lugs are welded at the empty foil areas close to the ends of the active material areas after being cut into pole piece monomers), the pole piece prepared by the preparation method has low energy density and high impedance, cannot well meet the requirements of fast charge and fast discharge, is easy to heat up the pole piece during charging, thereby causing danger, and because the pole lugs are welded at the intervals 2' of the active material areas, therefore, a large space is required to be reserved when the pole piece is prepared, the current collector 1 cannot be well utilized, and material waste is caused.
On the basis of the traditional pole piece process, the position of the pole lug is moved to the middle of the active substance layer to form an embedded pole lug position, so that the aims of improving high energy density, realizing quick charging and discharging and reducing resistance are fulfilled. However, the conventional production process of the pole piece with the embedded pole lug mainly comprises two steps:
the first method comprises the following steps: as shown in fig. 3, a foaming adhesive is pasted on a tab position preset on a current collector 1 through a foaming adhesive coating process, then an active material layer 3 is brushed, the foaming adhesive is positioned in the middle of the active material layer 3, the foaming adhesive is heated to fall off from the current collector 1 to form a welding hollowed-out area 1 'for welding a tab, so that a pre-cutting mother roll a with the welding hollowed-out area 1' is formed, the pre-cutting mother roll a is cut to obtain a post-cutting pole piece b, the active material layer at the edge of the welding hollowed-out area 1 'in the post-cutting pole piece b is cut to obtain a post-cutting pole piece c, and the tab is welded in the welding hollowed-out area 1' in the post-cutting pole piece c; the process method needs to adopt the foaming adhesive, has high cost, needs to increase a die cutting station to cut off the active material layer at the edge of the welding hollow area 1' in the pole piece b after cutting, and has complicated working procedures and low production efficiency.
And the second method comprises the following steps: as shown in fig. 4, the active material layer 3 coated on the current collector 1 is scraped out of the welding hollow area 1 'for welding the tab by the scraping process, and the process needs to add the scraping process to obtain the welding hollow area 1' for welding the tab in the middle of the active material layer 3, so that the production efficiency is low, and the mass production is not facilitated.
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: 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 surface of the current collector, wherein the active material layer is coated on the upper surface of the first removal layer, and the edge part of the first removal layer is exposed out of the active material layer to form a first exposed part;
and applying external force to the first exposed part to strip the first removal layer from the current collector, so that a first hollow area which is used for welding a tab and is not covered by the active material layer is formed on the first surface of the current collector.
Optionally, the first removal layers are provided in plurality, and the plurality of first removal layers are distributed on two sides of the active material layer.
Optionally, the step of coating the active material layer on the first surface of the current collector is specifically as follows: the first surface of the current collector is coated with a plurality of active material layers distributed at intervals.
Optionally, after the external force is applied to the exposed portion to strip the first removal layer from the current collector, the method for preparing a battery pole piece further includes presetting a second tab position on the second surface of the current collector, where 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, wherein the active material layer is coated on the upper surface of the second removal layer, and the edge part of the second removal layer is exposed out of the active material layer to form a second exposed part;
applying an external force to the second exposed portion to strip the second removal layer from the current collector to form a second hollow area on the second surface of the current collector, wherein the second hollow area is not covered by the active material layer, so that a pole piece material with the active material layer coated on both surfaces and the first hollow area and the second hollow area is formed.
Optionally, after the external force is applied to the second exposed part to strip the second removal layer from the current collector to form a second hollow area on the second surface of the current collector, wherein the second hollow area is not covered by the active material layer, the preparation method of the battery pole piece further comprises rolling the pole piece material with the active material layer coated on both surfaces;
and cutting the pole piece materials after rolling to form a plurality of pole piece monomers with one first hollow area and one second hollow area.
Optionally, the first removal layer is made of gummed paper which is not foamed when heated.
Optionally, the thickness of the first removal layer is in the range of 6-60 μm.
Optionally, attaching a first removal layer to the first tab position specifically includes: and the first removing layer is pasted on the position of the first lug through a gluing mechanism.
Optionally, before applying an external force to the first exposed part to strip the first removal layer from the current collector, the method for preparing the battery pole piece further comprises heating the current collector coated with the active material layer to solidify the active material layer.
Optionally, the applying an external force to the first exposed portion to strip the first removal layer from the current collector specifically includes: and stripping the first removing layer from the current collector after the first exposed part is clamped, stuck or sucked by a glue stripping mechanism.
According to the preparation method of the battery pole piece, provided by the embodiment of the invention, a first pole lug position is preset 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 surface of a current collector, wherein the active material layer passes through the upper surface of a first removal layer, and the edge part of the first removal layer is exposed out of the active material layer to form a first exposed part; applying external force to the first exposed part to strip the first removal layer from the current collector, so that a first hollow area which is used for welding a tab and is not covered by the active material layer is formed on the first surface of the current collector; the part of the first hollowed-out area manufactured in the mode is in an open state, the tab can be directly welded on the first hollowed-out area, the active substance layer at the edge of the first hollowed-out area is not required to be cut by increasing a die cutting station, the manufacturing processes are reduced, the production efficiency is improved, the cost is reduced, the problem of damage to a current collector possibly caused by the die cutting process is solved, and the quality of the manufactured pole piece is improved.
Drawings
FIG. 1 is a schematic diagram of a conventional pole piece;
FIG. 2 is a schematic structural diagram of a conventional pole piece from another perspective;
fig. 3 is a state diagram of raw material molding in each stage when the tab embedded pole piece is manufactured by the existing foam glue coating process;
fig. 4 is a state diagram of raw material molding at various stages when the tab embedded pole piece is manufactured by the conventional scraping process;
fig. 5 is a schematic structural view when an active material layer is coated on the upper surfaces of a current collector and a first removal layer;
FIG. 6 is a partial cross-sectional view of FIG. 5;
FIG. 7 is a state diagram of the present invention in the state where the raw material is formed at various stages after the first removal layer is torn off;
fig. 8 is a schematic structural view of a tab embedded pole piece manufactured by the battery pole piece manufacturing method according to an embodiment of the present invention.
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;
2. a first removal layer; 21. a first exposed portion;
3. an active material layer;
4. a tab;
5. a first hollowed-out 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: a first tab position is preset on the first surface of the current collector 1.
S20: and sticking a first removing layer 2 on the position of the first tab.
S30: as shown in fig. 5 to 6, an active material layer 3 is coated on a first surface of the current collector 1, the active material layer 3 is coated on an upper surface of the first removal layer 2, and a first exposed portion 21 is formed by exposing the active material layer 3 at an edge portion of the first removal layer 2. The first exposed portion 21 may or may not have adhesive properties, and the invention is not limited thereto. 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 2 may be coated by a coater, so that the coating efficiency is improved.
S40: as shown in fig. 7, an external force is applied to the first exposed portion 21 to strip the first removal layer 2 from the current collector 1, so that a first hollow area 5 for welding a tab 4, which is not covered by the active material layer 3, is formed on the first surface of the current collector 1.
S50: and welding a tab 4 on the first hollow area 5.
According to the preparation method of the battery pole piece, provided by the embodiment of the invention, a first tab position is preset on a first surface of a current collector 1; sticking a first removing layer 2 on the position of the first tab; coating an active material layer 3 on a first surface of a current collector 1, wherein the active material layer 3 is coated on the upper surface of a first removal layer 2, and the edge part of the first removal layer 2 exposes the active material layer 3 to form a first exposed part 21; applying an external force to the first exposed part 21 to strip the first removal layer 2 from the current collector 1, thereby forming a first hollow area 5, which is not covered by the active material layer 3, for welding the tab 4 on the first surface of the current collector 1; the first hollow-out area 5 that this kind of mode made is opening state at the part at the edge promptly, can directly weld utmost point ear 4 on it, need not to increase the cross cutting station and excises the active material layer 3 of first hollow-out area 5 edge, has reduced the preparation process to improve production efficiency, reduce cost, and also avoided because the problem of the damage to mass flow body 1 that the cross cutting process probably caused, improved the quality of making back pole piece.
In one embodiment, as shown in fig. 5 and 7, the first removal layer 2 is provided in plurality, and the first removal layers 2 are distributed on both sides of the active material layer 3. Through with first removal layer 2 distributes in active material layer 3's both sides can cut the mass flow body from between the first removal layer 2 of both sides, makes a plurality of pole piece monomers that have first fretwork district 5, has improved production efficiency, and wherein, first removal layer 2 is located active material layer 3's length direction and is close to in the middle or in the position in the middle for the free first fretwork district 5 of pole piece of making is close to in the middle or in the position in the middle in the length direction at pole piece monomer edge.
In an embodiment, the step of coating the active material layer 3 on the first surface of the current collector 1 specifically includes: a plurality of active material layers 3 are coated on the first surface of the current collector 1 at intervals. Through a plurality of active material layers 3 of interval distribution, can divide a plurality of pole piece monomers through cutting, further improved production efficiency, it should be noted that, need make the free first fretwork district 5 of pole piece of making in the middle or on the position in the middle of being close to of the length direction at pole piece monomer edge when cutting.
The number of the active material layers 3 to be coated can be set according to the width of the current collector 1 and the width of the required pole piece, for example, as shown in fig. 5 and 7, the plurality of active material layers 3 are distributed at intervals in the width direction of the current collector 1, the first removal layers 2 are distributed on two sides of each active material layer 3 in the width direction, a plurality of first hollow-out areas 5 can be formed by peeling off the first removal layers 2, and the pole piece monomers with one first hollow-out area 5 are formed by slitting along the length direction of the current collector 1 according to the width of the required pole piece during slitting.
In an embodiment, after step S40 and before step S50, that is, after the external force is applied to the exposed portion to strip the first removal layer 2 from the current collector 1 and before the tab 4 is welded on the first hollow-out area 5, the method for preparing a battery pole piece further includes step S60: 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;
step S70: sticking a second removing layer on the position of the second tab;
step S80: coating an active material layer 3 on a second surface of the current collector 1, wherein the active material layer 3 is coated on the upper surface of the second removal layer, and the edge part of the second removal layer exposes the active material layer 3 to form a second exposed part;
step S90: applying an external force to the second exposed portion to strip 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, thereby forming a pole piece material coated with the active material layer 3 on both surfaces and having the first hollow area 5 and the second hollow area 6 (as shown in fig. 8). After the first removal layer 2 on the first surface of the current collector 1 is removed, the second hollowed-out area 6 is formed on the second surface of the current collector in the same way, so that the problem that the thickness of a lug position (a first lug position and a 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 1 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, after step S90, that is, after applying an external force to the second exposed portion to strip the second removal layer from the current collector 1 to form the second hollow-out area 6 on the second surface of the current collector 1, which is not covered by the active material layer 3, the method for preparing a battery pole piece further includes step S100: the polar sheet coated on both sides with the active material layer 3 is subjected to rolling. The thickness of the very sheet material can be rolled to the desired process thickness by rolling.
Step S110: and cutting the pole piece materials after rolling to form a plurality of pole piece monomers with one first hollow area 5 and one second hollow area 6. And finally, welding a tab on the first hollow-out area 5 or the second hollow-out area 6 of the pole piece monomer.
In one embodiment, the first removal layer 2 is made of adhesive paper which is not foamed when heated. Compared with the existing method adopting the foaming glue, the method adopting the gummed paper which is not foamed after being heated has lower cost. Wherein, the gummed paper is mainly made of acrylic gum (polymethyl methacrylate), color paste and cross-linking agent.
The acrylic glue is the main component of the adhesive paper.
The main function of the color paste is dyeing, so that the gummed paper can be made into required colors according to different requirements.
Crosslinking agents, also called curing agents, hardeners or curing agents, which convert linear or slightly branched macromolecules into a three-dimensional network structure, thereby improving the strength, heat resistance, wear resistance and solvent resistance of the adhesive paper, so that the adhesive paper does not foam, roll up and expand when the current collector 1 coated with the active substance layer 3 is heated, and commonly used crosslinking agents are mainly organic peroxides, such as: DCP (i.e., dicumyl peroxide), BPO (benzoyl peroxide), DTBP (di-t-butyl peroxide), DBHP (dicumyl peroxide), or bis 25 (i.e., 2, 5-dimethyl-2, 5-di-t-butylperoxyhexane).
Preferably, the peel strength of the adhesive tape is controlled to be less than 150N/m, so that the adhesive tape can be peeled off from the current collector 1 later, and the adhesive tape is ensured not to fall off from the current collector 1 when the active material layer 3 is coated thereon and during baking.
In one embodiment, the thickness of the first removal layer 2 is in the range of 6-60 μm. The first removal layer of this thickness does not interfere with the coating of the active material layer 3 on the current collector 1.
In an embodiment, the attaching the first removal layer 2 to the first tab position specifically includes: and sticking the first removal layer 2 to the first tab position through a gluing mechanism. The first removing layer 2 is pasted on the first pole lug position through a gluing mechanism, so that the efficiency of pasting the first removing layer 2 can be improved.
In an embodiment, before step S40, that is, before applying an external force to the first exposed part 21 to strip the first removal layer 2 from the current collector 1, the method for preparing a battery pole piece further includes step S120: 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 the first removal layer 2 does not foam, roll up and expand during the heating process, and after the baking process, the first removal layer 2 is peeled off from the current collector 1.
In an embodiment, the applying an external force to the first exposed portion 21 to strip the first removal layer 2 from the current collector 1 specifically includes: the first exposed part 21 is clamped, stuck or sucked by a glue stripping mechanism (a manipulator can be adopted to realize clamping action, and a vacuum chuck can be adopted to realize adsorption action), and the first removing layer 2 is stripped from the current collector 1. The first removing layer 2 is stripped from the current collector 1 through a glue stripping mechanism, and the efficiency is high.
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:
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 surface of the current collector, wherein the active material layer is coated on the upper surface of the first removal layer, and the edge part of the first removal layer is exposed out of the active material layer to form a first exposed part;
and applying external force to the first exposed part to strip the first removal layer from the current collector, so that a first hollow area which is used for welding a tab and is not covered by the active material layer is formed on the first surface of the current collector.
2. The method for preparing the battery pole piece according to claim 1, wherein the first removal layers are provided in plurality, and the plurality of first removal layers are distributed on two sides of the active material layer.
3. The method for preparing the battery pole piece according to claim 2, wherein the step of coating the active material layer on the first surface of the current collector is specifically as follows: the first surface of the current collector is coated with a plurality of active material layers distributed at intervals.
4. The method of claim 3, further comprising presetting a second tab position on the second surface of the current collector after the external force is applied to the exposed portion to strip the first removal layer from the current collector, the second tab position being 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, wherein the active material layer is coated on the upper surface of the second removal layer, and the edge part of the second removal layer is exposed out of the active material layer to form a second exposed part;
applying an external force to the second exposed portion to strip the second removal layer from the current collector to form a second hollow area on the second surface of the current collector, wherein the second hollow area is not covered by the active material layer, so that a pole piece material with the active material layer coated on both surfaces and the first hollow area and the second hollow area is formed.
5. The method for preparing a battery pole piece according to claim 4, wherein after the external force is applied to the second exposed part to strip the second removal layer from the current collector to form a second hollow area on the second surface of the current collector, wherein the second hollow area is not covered by the active material layer, the method for preparing a battery pole piece further comprises rolling the pole piece stock coated with the active material layer on both surfaces;
and cutting the pole piece materials after rolling to form a plurality of pole piece monomers with one first hollow area and one second hollow area.
6. The preparation method of the battery pole piece according to claim 1, wherein the first removal layer is adhesive paper which is not foamed when heated.
7. The method for preparing the battery pole piece according to claim 6, wherein the thickness of the first removal layer is in a range of 6-60 μm.
8. The method for preparing the battery pole piece according to claim 6, wherein the step of adhering the first removing layer to the first tab position specifically comprises the steps of: and the first removing layer is pasted on the position of the first lug through a gluing mechanism.
9. The method of claim 1, further comprising heating the current collector coated with the active material layer to solidify the active material layer before applying an external force to the first exposed portion to strip the first removal layer from the current collector.
10. The method for preparing a battery pole piece according to claim 1, wherein the step of applying an external force to the first exposed portion to strip the first removal layer from the current collector comprises: and stripping the first removing layer from the current collector after the first exposed part is clamped, stuck or sucked by a glue stripping mechanism.
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| CN202011494719.7A CN112670437A (en) | 2020-12-17 | 2020-12-17 | Preparation method of battery pole piece |
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| CN202011494719.7A CN112670437A (en) | 2020-12-17 | 2020-12-17 | Preparation method of battery pole piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105742565A (en) * | 2016-02-29 | 2016-07-06 | 宁德新能源科技有限公司 | Lithium ion battery pole plate and preparation method thereof |
| CN107346831A (en) * | 2016-05-04 | 2017-11-14 | 上海奇谋能源技术开发有限公司 | A kind of method for improving lithium ion battery service life |
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2020
- 2020-12-17 CN CN202011494719.7A patent/CN112670437A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105742565A (en) * | 2016-02-29 | 2016-07-06 | 宁德新能源科技有限公司 | Lithium ion battery pole plate and preparation method thereof |
| CN107346831A (en) * | 2016-05-04 | 2017-11-14 | 上海奇谋能源技术开发有限公司 | A kind of method for improving lithium ion battery service life |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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Application publication date: 20210416 |