CN114420885A - Pole piece manufacturing method - Google Patents
Pole piece manufacturing method Download PDFInfo
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- CN114420885A CN114420885A CN202210083083.XA CN202210083083A CN114420885A CN 114420885 A CN114420885 A CN 114420885A CN 202210083083 A CN202210083083 A CN 202210083083A CN 114420885 A CN114420885 A CN 114420885A
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- coating
- pole piece
- slurry
- base material
- manufacturing
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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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0419—Methods of deposition of the material involving spraying
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The embodiment of the invention provides a pole piece manufacturing method, and relates to the technical field of lithium batteries. The pole piece manufacturing method comprises the steps of coating the first surface of a base material; prepressing the first surface of the base material; coating the second surface of the substrate; prepressing the second surface of the base material; and rolling the pre-pressed base material to obtain the pole piece. After the first surface and the second surface are respectively pre-pressed, the whole base material is rolled, and the conditions of cracks and faults of the base material in the rolling process can be reduced.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a pole piece manufacturing method.
Background
In the age of rapid development of lithium batteries, the requirements for each process of lithium batteries are higher and higher in the industry, the coating is an important process in the manufacturing process of the pole piece of the lithium battery, the quality of the coating directly influences the process of the subsequent process, but the phenomena of cracks, faults and the like are easy to occur after the pole piece of the lithium battery is rolled in the manufacturing process at present, and the performance of the battery is influenced.
Disclosure of Invention
The invention aims to provide a pole piece manufacturing method which can reduce the condition that a pole piece has cracks or faults in the manufacturing process.
Embodiments of the invention may be implemented as follows:
a pole piece manufacturing method is used for forming a base material into a pole piece, the base material is provided with a first surface and a second surface which are oppositely arranged, and the pole piece manufacturing method comprises the following steps:
coating the first surface of the substrate;
pre-pressing the first surface of the base material;
coating the second surface of the substrate;
pre-pressing the second surface of the base material;
and rolling the pre-pressed base material to obtain the pole piece.
In an alternative embodiment of the present invention, the first surface has a first coating region, and the step of coating the first surface of the substrate comprises:
and controlling the gas spraying equipment to perform special-shaped spraying slurry on the first coating area.
In an alternative embodiment of the invention, the gas spraying equipment comprises a plurality of nozzles, the nozzles are arranged at intervals, and the distance between two adjacent nozzles is 0.1mm-0.5 mm.
In an alternative embodiment of the present invention, the first coating region has a coating shape of a spaced grid or a connected grid.
In an alternative embodiment of the present invention, the step of controlling the gas spraying apparatus to perform the profile spraying of the slurry to the first coating zone includes:
and controlling the gas pressure and the slurry flow rate of the gas spraying equipment according to the first coating amount of the first coating area.
In an alternative embodiment of the present invention, the second surface has a second coating region, and the step of coating the second surface of the substrate comprises:
and controlling the gas spraying equipment to perform special-shaped spraying on the second coating area.
In an alternative embodiment of the invention, the gas spraying equipment comprises a plurality of nozzles, the nozzles are arranged at intervals, and the distance between two adjacent nozzles is 0.1mm-0.5 mm.
In an alternative embodiment of the present invention, the coating shape of the second coating region is a spaced grid shape or a connected grid shape.
In an alternative embodiment of the present invention, the step of controlling the gas spraying apparatus to perform the profile spraying of the slurry to the second coating zone includes:
and controlling the gas pressure and the slurry flow rate of the gas spraying equipment according to the second coating amount of the second coating area.
In an alternative embodiment of the present invention, before the step of coating the first surface of the substrate, the method for manufacturing a pole piece further includes:
preparing slurry for coating the first surface and the second surface;
subjecting the slurry to a plurality of filtrations;
and carrying out preheating treatment on the filtered slurry.
The embodiment of the invention has the following beneficial effects: the pole piece manufacturing method comprises the steps of coating the first surface of a base material; prepressing the first surface of the base material; coating the second surface of the substrate; prepressing the second surface of the base material; and rolling the pre-pressed base material to obtain the pole piece. After the first surface and the second surface are respectively pre-pressed, the whole base material is rolled, and the conditions of cracks and faults of the base material in the rolling process can be reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flowchart of a pole piece manufacturing method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Examples
Referring to fig. 1, the present embodiment provides a method for manufacturing a pole piece, and the method for manufacturing a pole piece provided by the present embodiment can reduce the occurrence of cracks or faults in the pole piece manufacturing process.
In the age of rapid development of lithium batteries, the requirements for each process of lithium batteries are higher and higher in the industry, and coating is an important process in the manufacturing process of the pole piece of the lithium battery, and the quality of the coating directly affects the process of the subsequent process.
The pole piece manufacturing method provided by the embodiment is used for forming a base material into a pole piece, wherein the base material is provided with a first surface and a second surface which are oppositely arranged, and the specific steps are as follows:
step S10, preparing a slurry for coating the first surface and the second surface.
In this example, the slurry required for coating was prepared prior to coating. If the manufactured pole piece is a positive pole piece, the slurry is positive pole slurry. If the manufactured pole piece is a negative pole piece, the slurry is negative pole slurry.
In step S20, multiple filtrations are performed on the slurry.
And filtering the prepared slurry, and performing multiple filtering through filter screens with different pore diameters, wherein the pore diameter of each filter screen can be 100 microns, 75 microns and the like.
In step S30, the filtered slurry is preheated.
After the slurry is filtered, the slurry is preheated and heated to be kept at 50-60 ℃.
Step S40, a coating process is performed on the first surface of the substrate.
And after the slurry is prepared, coating the first surface of the base material, and controlling the gas spraying equipment to perform special-shaped slurry spraying on the first coating area during coating. The gas pressure of the gas spraying device and the flow rate of the slurry are controlled according to the first coating amount of the first coating zone.
For example: if the first coating weight is large, the gas pressure and the slurry flow rate are set relatively large. If the first coating weight is small, the gas pressure and slurry flow rate settings are relatively small.
Gas blows thick liquids to becoming ultra-thin water curtain form through gas spraying equipment and spraying to the substrate along the mechanism direction on, compares that other modes coating speed is fast, the precision is high, the homogeneity is good, can prevent that the pollutant from getting into at the coating process, and thick liquids utilization ratio is high, strong adaptability. The combination mode of the spray heads can be selected according to the actual coating requirement, such as single-row multi-spray heads, multi-row multi-spray heads and the like.
In the embodiment, the gas spraying equipment comprises a plurality of nozzles, the nozzles are arranged at intervals, and the distance between every two adjacent nozzles is 0.1-0.5 mm. The plurality of nozzles are arranged in sequence along the width direction of the base material, namely the arrangement direction of the plurality of nozzles is perpendicular to the advancing direction of the base material.
In this embodiment, the first coating region has a coating shape of a spaced grid or a connected grid.
The first coating region may be coated in a non-uniform manner such as a diamond pattern or a circle pattern, in addition to the mesh pattern.
The pole piece is subjected to grid type and rhombus type coating, wherein the total thickness of the coating, the grid bulging height, the grid width, the grid spacing gap and the like can be adjusted according to the process requirements, and the coating method can enable the internal stress and the extrusion force to be smooth during rolling and release the internal stress at the same time, so that the original phenomena of bulging, fault, bending after rolling and the like are changed.
Step S50, pre-pressing the first surface of the base material.
In this embodiment, after the coating of the first surface is completed, the first surface is pre-pressed before rolling, so as to release the internal stress of the first surface.
Step S60, a coating process is performed on the second surface of the substrate.
And after the slurry is prepared, coating the second surface of the base material, and controlling the gas spraying equipment to perform special-shaped slurry spraying on the second coating area during coating. The gas pressure of the gas spraying device and the flow rate of the slurry are controlled according to the second coating amount of the second coating zone.
For example: if the second coating amount is large, the gas pressure and the slurry flow rate are set relatively large. If the second coating weight is small, the gas pressure and slurry flow rate settings are relatively small.
Gas blows thick liquids to becoming ultra-thin water curtain form through gas spraying equipment and spraying to the substrate along the mechanism direction on, compares that other modes coating speed is fast, the precision is high, the homogeneity is good, can prevent that the pollutant from getting into at the coating process, and thick liquids utilization ratio is high, strong adaptability. The combination mode of the spray heads can be selected according to the actual coating requirement, such as single-row multi-spray heads, multi-row multi-spray heads and the like.
In the embodiment, the gas spraying equipment comprises a plurality of nozzles, the nozzles are arranged at intervals, and the distance between every two adjacent nozzles is 0.1-0.5 mm. The plurality of nozzles are arranged in sequence along the width direction of the base material, namely the arrangement direction of the plurality of nozzles is perpendicular to the advancing direction of the base material.
In this embodiment, the second coating region has a coating shape of a spaced grid or a connected grid.
The second coating region may be coated in a non-uniform manner such as a diamond pattern or a circle pattern, in addition to the mesh pattern.
Step S70, pre-pressing the second surface of the base material.
In this embodiment, after the coating of the first surface is completed, the first surface is pre-pressed before rolling, so as to release the internal stress of the first surface.
And step S80, performing rolling treatment on the pre-pressed base material to obtain the pole piece.
And pre-pressing and rolling the base material to obtain the pole piece.
The working principle of the pole piece manufacturing method provided by the embodiment is as follows: in this embodiment, after the coating of the first surface is completed, the first surface is pre-pressed, after the coating of the second surface is completed, the second panel is pre-pressed, and finally, the whole substrate is roll-pressed to obtain the pole piece.
In summary, in the pole piece manufacturing method provided in this embodiment, the first surface and the second surface are pre-pressed respectively, and then the entire substrate is rolled, so that the occurrence of cracks and faults in the rolling process of the substrate can be reduced.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A pole piece manufacturing method is used for forming a base material into a pole piece, wherein the base material is provided with a first surface and a second surface which are oppositely arranged, and the pole piece manufacturing method comprises the following steps:
coating the first surface of the substrate;
pre-pressing the first surface of the base material;
coating the second surface of the substrate;
pre-pressing the second surface of the base material;
and rolling the pre-pressed base material to obtain the pole piece.
2. The method of claim 1, wherein the first surface has a first coating area, and the step of coating the first surface of the substrate comprises:
and controlling the gas spraying equipment to perform special-shaped spraying slurry on the first coating area.
3. The pole piece manufacturing method according to claim 2, wherein the gas spraying device comprises a plurality of nozzles, the nozzles are spaced apart from each other, and the distance between two adjacent nozzles is 0.1mm-0.5 mm.
4. The method for manufacturing the pole piece according to claim 2, wherein the coating shape of the first coating area is a spaced grid shape or a connected grid shape.
5. The pole piece manufacturing method according to claim 2, wherein the step of controlling the gas spraying device to perform profile spraying of the slurry on the first coating area comprises:
and controlling the gas pressure and the slurry flow rate of the gas spraying equipment according to the first coating amount of the first coating area.
6. The method of claim 1, wherein the second surface has a second coating region, and the step of coating the second surface of the substrate comprises:
and controlling the gas spraying equipment to perform special-shaped spraying on the second coating area.
7. The manufacturing method of the pole piece according to claim 6, wherein the gas spraying equipment comprises a plurality of nozzles, the nozzles are arranged at intervals, and the distance between every two adjacent nozzles is 0.1mm-0.5 mm.
8. The method for manufacturing the pole piece according to claim 6, wherein the coating shape of the second coating area is a spaced grid shape or a connected grid shape.
9. The pole piece manufacturing method according to claim 6, wherein the step of controlling the gas spraying device to perform profile spraying of the slurry on the second coating area comprises:
and controlling the gas pressure and the slurry flow rate of the gas spraying equipment according to the second coating amount of the second coating area.
10. The method of claim 1, further comprising, prior to the step of coating the first surface of the substrate:
preparing slurry for coating the first surface and the second surface;
subjecting the slurry to a plurality of filtrations;
and carrying out preheating treatment on the filtered slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210083083.XA CN114420885A (en) | 2022-01-25 | 2022-01-25 | Pole piece manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210083083.XA CN114420885A (en) | 2022-01-25 | 2022-01-25 | Pole piece manufacturing method |
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| Publication Number | Publication Date |
|---|---|
| CN114420885A true CN114420885A (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210083083.XA Pending CN114420885A (en) | 2022-01-25 | 2022-01-25 | Pole piece manufacturing method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207195A (en) * | 2006-12-22 | 2008-06-25 | 比亚迪股份有限公司 | Method for preparation of battery pole piece |
| CN102169983A (en) * | 2010-02-25 | 2011-08-31 | 深圳市比克电池有限公司 | Manufacturing method of lithium-ion battery and pressing method of graphite negative electrode piece of lithium-ion battery |
| CN102324496A (en) * | 2011-09-19 | 2012-01-18 | 江苏乐能电池股份有限公司 | Tabletting method for lithium ion battery positive plate |
| CN105583226A (en) * | 2015-11-17 | 2016-05-18 | 杭州伯坦科技工程有限公司 | Rolling method and device for battery pole piece |
| JP2017064669A (en) * | 2015-10-02 | 2017-04-06 | Ｊｆｅスチール株式会社 | Application method and application device of slurry |
| CN108370031A (en) * | 2016-09-09 | 2018-08-03 | 株式会社Lg化学 | The method for preparing the secondary cell for including high-capacity electrode |
| CN109713226A (en) * | 2018-12-19 | 2019-05-03 | 广西卡耐新能源有限公司 | A method of improving the rebound of flexible packing lithium ion battery thickness |
| CN111682162A (en) * | 2020-05-25 | 2020-09-18 | 惠州亿纬创能电池有限公司 | Battery pole piece and preparation method thereof |
-
2022
- 2022-01-25 CN CN202210083083.XA patent/CN114420885A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207195A (en) * | 2006-12-22 | 2008-06-25 | 比亚迪股份有限公司 | Method for preparation of battery pole piece |
| CN102169983A (en) * | 2010-02-25 | 2011-08-31 | 深圳市比克电池有限公司 | Manufacturing method of lithium-ion battery and pressing method of graphite negative electrode piece of lithium-ion battery |
| CN102324496A (en) * | 2011-09-19 | 2012-01-18 | 江苏乐能电池股份有限公司 | Tabletting method for lithium ion battery positive plate |
| JP2017064669A (en) * | 2015-10-02 | 2017-04-06 | Ｊｆｅスチール株式会社 | Application method and application device of slurry |
| CN105583226A (en) * | 2015-11-17 | 2016-05-18 | 杭州伯坦科技工程有限公司 | Rolling method and device for battery pole piece |
| CN108370031A (en) * | 2016-09-09 | 2018-08-03 | 株式会社Lg化学 | The method for preparing the secondary cell for including high-capacity electrode |
| CN109713226A (en) * | 2018-12-19 | 2019-05-03 | 广西卡耐新能源有限公司 | A method of improving the rebound of flexible packing lithium ion battery thickness |
| CN111682162A (en) * | 2020-05-25 | 2020-09-18 | 惠州亿纬创能电池有限公司 | Battery pole piece and preparation method thereof |
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