CN212277235U - Pole piece structure of multilayer coating - Google Patents
Pole piece structure of multilayer coating Download PDFInfo
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- CN212277235U CN212277235U CN202021375173.9U CN202021375173U CN212277235U CN 212277235 U CN212277235 U CN 212277235U CN 202021375173 U CN202021375173 U CN 202021375173U CN 212277235 U CN212277235 U CN 212277235U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a pole piece structure with multi-layer coating, which comprises a foil and a coating A layer coated on the surface A of the foil; and a B-side coating applied to the B side of the foil; the surface coating A is of a double-layer structure and comprises a surface A upper coating and a surface A lower coating; the surface coating B is of a double-layer structure and comprises a surface-B upper coating and a surface-B lower coating; the difference between the width of the upper coating on the surface A and the width of the lower coating on the surface A is 0.6-1 mm; the difference between the width of the coating on the surface B and the width of the coating under the surface B is 0.6-1 mm. The pole piece structure of the utility model coats two layers of wet material coatings simultaneously, so that the integration of double-layer powder is better, and the technical problem of drying, layering and falling is solved; the upper coating and the lower coating of the pole piece structure have a width difference, and the edge of the upper coating is gradually thinned, so that the problem of double-layer coating drum edge is solved.
Description
Technical Field
The utility model relates to a lithium ion battery makes technical field, especially relates to a pole piece structure of multilayer coating.
Background
In the manufacturing process of the lithium ion battery, an extrusion coating machine is generally adopted, a layer of flowable slurry is coated on the surface of a current collector, a pole piece is prepared after drying, and then the battery is formed through pressing, cutting and assembling.
At present, the mainstream coating machine can only coat one layer of slurry every time, which is limited by a coating window of a die head of the coating machine, the coating thickness is limited, the coating surface density is limited, and further, the energy density of a battery is reduced, so that a coating method adopting one-step coating of multiple layers of slurry becomes the development trend of the coating machine. In addition, when a plurality of layers of slurry are coated, the coating widths of the upper layer and the lower layer are not consistent, so that the technical problems of dislocation of the upper layer and the lower layer and edge bulging of the pole piece structure exist, and the technical problems to be solved in the field are needed.
In the prior art, most of existing coating machines are single-layer coating, one layer of slurry is coated on a foil material at a time, each die head is different in design, coating windows are different, the range of surface density capable of being coated is limited, and coating can be carried out on a coated pole piece again in order to improve the coating surface density. However, the method not only needs coating twice, has larger processing difficulty and poorer quality of finished products, but also coats wet materials on dry materials, is easy to delaminate and drop materials after drying, and seriously influences the product quality.
The second prior art can realize once coating two-layer slurry by double-layer coating, but when the upper and lower layer coating width design is consistent during double-layer coating, because of the double-layer coating thickness is large, slurry at the edge of the upper layer slurry can flow to the lower layer from the edge, so that the coating edge thickness fluctuation is large, and edge bulging easily occurs, which affects the pole piece processing performance.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an increase pole piece thickness, increase active material's surface density, improve battery capacity, and realize optimizing the multilayer coated pole piece structure of lower floor powder structure in order to solve double-deck coating drum limit problem.
In order to achieve the above object, the present invention provides the following technical solutions:
the utility model discloses a pole piece structure of multilayer coating, this pole piece structure includes:
a foil material;
an A-side coating applied to the A-side of the foil; and
a B-side coating applied to the B side of the foil;
the surface coating A is of a double-layer structure and comprises a surface A upper coating and a surface A lower coating;
the B surface coating is of a double-layer structure and comprises a B surface upper coating and a B surface lower coating;
the difference between the width of the coating on the surface A and the width of the coating under the surface A is 0.6-1 mm;
the difference between the width of the upper coating on the surface B and the width of the lower coating on the surface B is 0.6-1 mm. Further, the width of the coating on the surface A is 0.6-1 mm larger than that of the coating under the surface A;
the edge of the upper coating on the surface A is coated on the lower coating on the surface A, and the edge thickness of the upper coating on the surface A is gradually thinned;
the width of the coating on the surface B is 0.6-1 mm larger than that of the coating under the surface B;
the edge of the upper coating on the surface B is coated on the lower coating on the surface B, and the edge thickness of the upper coating on the surface B is gradually thinned.
Further, the width of the coating on the surface A is 0.6-1 mm smaller than that of the coating under the surface A;
the edge thickness of the coating on the surface A is gradually thinned;
the width of the coating on the surface B is 0.6-1 mm smaller than that of the coating under the surface B;
the edge thickness of the coating on the B surface is gradually thinned.
Further, an A-side edge coating is formed on the side surface of the A-side coating, and a B-side edge coating is formed on the side surface of the B-side coating.
Further, the thickness of the side coating on the surface A and the thickness of the side coating on the surface B are both smaller than that of the single-layer coating.
In the technical scheme, the utility model provides a pair of pole piece structure of multilayer coating has following beneficial effect:
the pole piece structure of the utility model coats two layers of wet material coatings simultaneously, so that the integration of double-layer powder is better, and the technical problem of drying, layering and falling is solved; the upper coating and the lower coating of the pole piece structure have a width difference, and the edge of the upper coating is gradually thinned, so that the problem of double-layer coating drum edge is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.
Fig. 1 is a schematic structural diagram of a first embodiment of a multilayer coated pole piece structure according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second implementation manner of a multilayer coated pole piece structure provided in an embodiment of the present invention.
Description of reference numerals:
1. a foil material; 2. a, coating a surface; 3. b, coating a surface;
101. surface A; 102. b surface;
201. coating on the surface A; 202. coating under the surface A; 203. coating the side A;
301. coating on the surface B; 302. b, coating under the surface; 303. and B, coating the side edge.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
See fig. 1-2;
the utility model discloses a pole piece structure of multilayer coating, this pole piece structure includes:
1, a foil material;
an a-side coating 2 applied to the a-side 101 of the foil 1; and
a B-side coating 3 applied to the B-side 102 of the foil 1;
the A surface coating 2 is a double-layer structure and comprises an A surface upper coating 201 and an A surface lower coating 202;
the B surface coating 3 is a double-layer structure and comprises a B surface upper coating 301 and a B surface lower coating 302;
the difference between the width of the upper coating 201 on the surface A and the width of the lower coating 202 on the surface A is 0.6-1 mm;
the difference between the width of the coating 301 on the surface B and the width of the coating 302 under the surface B is 0.6 mm-1 mm.
Specifically, the present embodiment is processed by simultaneously coating two layers of coatings, that is, the surface a 101 and the surface B102 of the foil 1 are simultaneously coated with two layers of coatings, namely, the surface a coating 2 and the surface B coating 3; the top coat 2 of the embodiment comprises a top coat 201 and a bottom coat 202 of the surface A, and the top coat 3 of the surface B comprises a top coat 301 of the surface B and a bottom coat 302 of the surface B. In order to solve the problem of coating edge bulging, the width of the coating 201 on the surface a is different from the width of the coating 202 under the surface a, and the width of the coating 301 on the surface B is different from the width of the coating 302 under the surface B.
The first embodiment is as follows:
referring to fig. 1, as a first embodiment of the present application:
the width of the upper coating 201 on the surface A is 0.6 mm-1 mm larger than that of the lower coating 202 on the surface A;
the edge of the surface A upper coating 201 is coated with the surface A lower coating 202, and the edge thickness of the surface A upper coating 201 is gradually thinned;
the width of the upper coating 301 on the surface B is 0.6-1 mm larger than that of the lower coating 302 on the surface B;
the edge of the B-side upper coating 301 is wrapped by the B-side lower coating 302, and the edge thickness of the B-side upper coating 301 is gradually thinned.
The upper coating is designed to be wider than the lower coating, the upper coating completely covers the lower coating during coating, and meanwhile, the edge is gradually thinned, so that the edge bulging phenomenon cannot occur in the coating process.
Example two:
referring to fig. 2, as a second embodiment of the present application:
the width of the upper coating 201 on the surface A is 0.6-1 mm smaller than that of the lower coating 202 on the surface A;
the edge thickness of the coating 201 on the A surface is gradually thinned;
the width of the upper coating 301 on the surface B is 0.6 mm-1 mm smaller than that of the lower coating 302 on the surface B;
the edge thickness of the coating 301 on side B is tapered.
The upper coating is designed to be smaller than the lower coating in width, so that the edge of the upper coating is gradually thinned during coating, and the problem of edge bulging in the coating process can be solved.
The side surface of the above-mentioned a-side coat layer 2 is provided with an a-side edge coat layer 203, and the side surface of the B-side coat layer 3 is provided with a B-side edge coat layer 303.
Among them, more specifically: the thickness of the side a coating 203 and the thickness of the side B coating 303 are both less than the thickness of a single layer coating.
In this embodiment, an a-side edge coating 203 and a B-side edge coating 303 are respectively formed on the side surfaces of the a-side coating 2 and the B-side coating 3, wherein the a-side edge coating 203 and the B-side edge coating 303 are joined with the base material region, and the thickness is smaller than that of a single-layer coating.
Example three:
based on the pole piece structure of the first embodiment, the parameters after actual processing are as follows:
areal density of the under a-side coating 202: 86.047 +/-2 g/m2Areal density of topcoat 2 of a: 262.443 +/-4 g/m2；
Areal density of the B-side undercoating 302: 86.047 +/-2 g/m2B surface density of top coat 3: 262.443 +/-4 g/m2；
Width of coating 202 under a-side: 266+0.5mm, width of coating 01 on side a: 266.8+0.5 mm;
width of coating 302 under B-side: 266+0.5mm, width of coating 301 on side B: 266.8+0.5 mm.
Example four:
based on the pole piece structure of the second embodiment, the parameters after actual processing are as follows:
areal density of the under a-side coating 202: 143.038 + -3 g/m2Areal density of topcoat 2 of a: 357.595 +/-6 g/m2；
Areal density of the B-side undercoating 302: 143.038 + -3 g/m2B surface density of top coat 3: 357.595 +/-6 g/m2；
Width of coating 202 under a-side: 260+0.5mm, width of coating 201 on side a: 259.4+0.5 mm;
width of coating 302 under B-side: 260+0.5mm, width of coating 301 on side B: 259.4+0.5 mm;
width of a-side edge coating 203: 3mm, thickness of the a-side coating 203: 47 um;
width of B-side edge coating 303: 3mm, thickness of B-side edge coating 303: and 47 um.
In the technical scheme, the utility model provides a pair of pole piece structure of multilayer coating has following beneficial effect:
the pole piece structure of the utility model coats two layers of wet material coatings simultaneously, so that the integration of double-layer powder is better, and the technical problem of drying, layering and falling is solved; the upper coating and the lower coating of the pole piece structure have a width difference, and the edge of the upper coating is gradually thinned, so that the problem of double-layer coating drum edge is solved.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (5)
1. A multilayer coated pole piece structure, comprising:
a foil (1);
an A-side coating (2) applied to the A-side (101) of the foil (1); and
a B-side coating (3) applied to the B-side (102) of the foil (1);
the A surface coating (2) is of a double-layer structure and comprises an A surface upper coating (201) and an A surface lower coating (202);
the B surface coating (3) is of a double-layer structure and comprises a B surface upper coating (301) and a B surface lower coating (302);
the difference between the width of the surface A upper coating (201) and the width of the surface A lower coating (202) is 0.6-1 mm;
the difference between the width of the upper coating (301) on the surface B and the width of the lower coating (302) on the surface B is 0.6-1 mm.
2. The multilayer coated pole piece structure of claim 1, wherein the width of the coating layer (201) on the a-side is 0.6mm to 1mm greater than the width of the coating layer (202) under the a-side;
the edge of the surface A upper coating (201) wraps the surface A lower coating (202), and the edge thickness of the surface A upper coating (201) is gradually thinned;
the width of the upper coating (301) on the surface B is 0.6-1 mm larger than that of the lower coating (302) on the surface B;
the edge of the B surface upper coating (301) wraps the B surface lower coating (302), and the edge thickness of the B surface upper coating (301) is gradually thinned.
3. The multilayer coated pole piece structure of claim 1, wherein the width of the coating layer (201) on the a-side is 0.6-1 mm smaller than the width of the coating layer (202) under the a-side;
the edge thickness of the coating (201) on the surface A is gradually thinner;
the width of the upper coating (301) on the surface B is 0.6-1 mm smaller than that of the lower coating (302) on the surface B;
the edge thickness of the coating (301) on the surface B is gradually thinner.
4. A multilayer coated pole piece structure according to claim 2 or 3, characterized in that the side of the a-side coating (2) is formed with an a-side edge coating (203) and the side of the B-side coating (3) is formed with a B-side edge coating (303).
5. The multilayer coated pole piece structure of claim 4, wherein the thickness of the A-side edge coating (203) and the thickness of the B-side edge coating (303) are both less than the thickness of a single layer coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021375173.9U CN212277235U (en) | 2020-07-13 | 2020-07-13 | Pole piece structure of multilayer coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021375173.9U CN212277235U (en) | 2020-07-13 | 2020-07-13 | Pole piece structure of multilayer coating |
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| CN212277235U true CN212277235U (en) | 2021-01-01 |
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| CN202021375173.9U Active CN212277235U (en) | 2020-07-13 | 2020-07-13 | Pole piece structure of multilayer coating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113578644A (en) * | 2021-07-20 | 2021-11-02 | 上海纳米技术及应用国家工程研究中心有限公司 | Auxiliary device for multilayer coating of lithium battery pole pieces |
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2020
- 2020-07-13 CN CN202021375173.9U patent/CN212277235U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113578644A (en) * | 2021-07-20 | 2021-11-02 | 上海纳米技术及应用国家工程研究中心有限公司 | Auxiliary device for multilayer coating of lithium battery pole pieces |
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