CN213150813U - Pole piece coating structure and battery cell - Google Patents
Pole piece coating structure and battery cell Download PDFInfo
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- CN213150813U CN213150813U CN202021654820.XU CN202021654820U CN213150813U CN 213150813 U CN213150813 U CN 213150813U CN 202021654820 U CN202021654820 U CN 202021654820U CN 213150813 U CN213150813 U CN 213150813U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model relates to a technical field of battery provides a pole piece coating structure and electric core, and wherein pole piece coating structure includes: a substrate; the first conducting layer is arranged on one side surface of the substrate; the first adhesive layer is arranged on the side face, far away from the base material, of the first conducting layer; the first conductive layer comprises a first colloid and a conductor mixed in the first colloid, and the material of the first colloid is the same as that of the first adhesive layer; the battery cell comprises a pole piece, wherein the pole piece comprises a base material, a conductive layer arranged on at least one side surface of the base material, and an adhesive layer arranged on the side surface of the conductive layer far away from the base material; the utility model provides a pole piece coating structure and battery has following advantage: the first glue film can protect the first conducting layer in the baking process, the problems of decarburization, powder falling and cracking of the first conducting layer are reduced, meanwhile, the material of the first glue film is the same as that of the colloid of the first conducting layer, and the influence on the performance of the first conducting layer is reduced.
Description
Technical Field
The utility model relates to a technical field of battery, more specifically say, relate to a pole piece coating structure and electric core.
Background
Coating is one of core processes for manufacturing the battery core, the quality of the coating directly affects the performance of the battery core, and the current industry faces the problem that serious phenomena such as decarburization, powder falling and cracks are generated when pole pieces are coated, so that the effective capacity of the battery core is reduced to different degrees, the quality of the battery core is reduced, and the safety of the battery core is damaged. The existing means for solving the problems is to increase the proportion of the binder in the slurry preparation process, but the effect is little, and the problems cannot be solved well. Particularly, in the case of double-sided coating, the above problem is more serious after the single-sided coating layer is subjected to secondary baking, and in the case of intermittent coating, the above problem is also more serious.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a pole piece coating structure and battery to the pole piece that exists among the solution prior art produces the decarbonization easily when carrying out coating process, falls the technical problem of powder and crackle.
In order to achieve the above object, the utility model discloses a technical scheme is a pole piece coating structure, include:
a substrate;
the first conducting layer is arranged on one side surface of the substrate; and
the first adhesive layer is arranged on the side face, far away from the base material, of the first conducting layer;
the first conductive layer comprises a first colloid and a conductor mixed in the first colloid, and the material of the first colloid is the same as that of the first adhesive layer.
Through adopting above-mentioned technical scheme, first glue film can protect first conducting layer in the baking process, reduces first conducting layer and produces the decarbonization, fall the problem of powder and crackle, and the material of first glue film is the same with the material of the colloid of first conducting layer simultaneously, has reduced the performance that influences first conducting layer.
In one embodiment, the first conductive layer is continuously coated on the substrate, or the first conductive layer includes a plurality of first conductive units intermittently coated on the substrate, and the first glue layer is continuously disposed on the plurality of first conductive units.
Through adopting above-mentioned technical scheme, first glue film adopts the mode of continuous coating to locate on a plurality of first conducting layers for when first conducting layer adopted the intermittent type coating mode, the margin district between two adjacent first conducting units can receive the protection of first glue film, and continuous coating does benefit to the coating efficiency who improves first glue film simultaneously.
In one embodiment, the first conductive layer includes a plurality of first conductive units intermittently coated on the substrate, and the first adhesive layer includes a plurality of first adhesive layer units coated on the first conductive units in a one-to-one correspondence.
By adopting the technical scheme, the material of the first glue layer can be saved by intermittent coating, and the manufacturing cost is reduced.
In one embodiment, an edge of each of the first adhesive layer units protrudes from an edge of the corresponding first conductive unit.
By adopting the technical scheme, the performance reduction caused by the fact that the first conducting layer is not covered by the first glue layer in the baking process is avoided.
In one embodiment, the liquid crystal display device further comprises a second conductive layer arranged on the other side surface of the substrate, and a second adhesive layer arranged on the side surface, far away from the substrate, of the second conductive layer, wherein the second conductive layer comprises a second adhesive body and a conductive body mixed in the second adhesive body, and the material of the second adhesive body is the same as that of the second adhesive layer.
Through adopting above-mentioned technical scheme for the pole piece is when two-sided coating, first conducting layer and second conducting layer all can receive the protection of first glue film and second glue film, reduces to toast the performance that influences first conducting layer and second conducting layer, and especially first conducting layer needs to be toasted through the secondary.
In one embodiment, the second conductive layer is continuously coated on the substrate, or the second conductive layer includes a plurality of second conductive units intermittently coated on the substrate, and the second glue layer is continuously disposed on the plurality of second conductive units.
By adopting the technical scheme, the second adhesive layer is arranged on the second conductive layer in a continuous coating mode, so that the margin area between two adjacent second conductive units can be protected by the second adhesive layer, and the continuous coating mode is favorable for improving the coating efficiency of the second adhesive layer; in addition, the design can ensure that the first conducting layer and the second conducting layer can be effectively protected in the secondary baking process.
In one embodiment, the second conductive layer includes a plurality of second conductive units intermittently coated on the substrate, and the second adhesive layer includes a plurality of second adhesive layer units coated on the second conductive units in a one-to-one correspondence.
By adopting the technical scheme, the materials of the second adhesive layer can be saved by intermittent coating, and the manufacturing cost is reduced.
In one embodiment, an edge of each of the second adhesive layer units protrudes from an edge of the corresponding second conductive unit.
By adopting the technical scheme, the performance reduction caused by the fact that the second conducting layer is not covered by the second glue layer in the baking process is avoided.
In one embodiment, the thickness of the first glue layer is equal to or less than the thickness of the substrate, and the thickness of the first glue layer is less than the thickness of the second glue layer.
Through adopting above-mentioned technical scheme, avoid the thickness of first glue film and second glue film to influence the quality and the manufacturing process of pole piece.
Another object of the present invention is to provide an electrical core, the electrical core includes a pole piece, the pole piece includes a substrate, set up in the conducting layer of the at least side of substrate, and set up in keeping away from of conducting layer glue film on the side of substrate.
By adopting the technical scheme, the problems of decarburization, powder falling and cracks of the pole piece in the coating process are reduced, and the stability, reliability and capacity consistency of the battery are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a pole piece coating structure provided in a first embodiment of the present invention;
fig. 2 is a schematic view of a pole piece coating structure provided by a second embodiment of the present invention;
fig. 3 is a schematic view of a pole piece coating structure provided by a third embodiment of the present invention;
fig. 4 is a schematic view of a pole piece coating structure provided by a fourth embodiment of the present invention;
fig. 5 is a schematic view of a pole piece coating structure provided in a fifth embodiment of the present invention;
fig. 6 is a schematic view of a pole piece coating structure provided by a sixth embodiment of the present invention.
The figures are numbered:
1-a substrate; 2-a first conductive layer; 21-a first conductive element; 3-a first glue layer; 31-a first glue layer unit; 4-a white space; 5-a second conductive layer; 51-a second conductive element; 6-a second glue layer; and 61-a second glue layer unit.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element.
It is to be understood that the terms "upper" and the like refer to orientations and positional relationships based on those shown in the drawings and are used for convenience in describing the present invention, and do not indicate that a device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention.
Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as indicating a number of technical features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. The following describes the specific implementation of the present invention in more detail with reference to specific embodiments:
as shown in fig. 1 to fig. 6, the embodiment of the utility model provides a pole piece coating structure, this pole piece coating structure can form the pole piece after cutting, is applied to on the lithium cell. The coating structure and the coating process of the pole piece have direct influence on the performance of the battery cell, and the coating is to uniformly coat the stirred slurry on a metal foil to form the pole piece, wherein the pole piece comprises a positive pole piece and a negative pole piece, the slurry is coated on an aluminum foil for the positive pole piece, the slurry is coated on a copper foil for the negative pole piece, and the positive pole piece and the negative pole piece are respectively formed by attaching the positive pole piece and the negative pole piece to the metal foil.
The slurry is a colloid mixed with a conductor, for example, positive and negative active substances are mixed in a binder to form the slurry, the slurry is transferred to a metal foil through a coating machine and then needs to be baked through a baking machine, and in the process, the heat and pressure of baking, the formula of the slurry and the surface structure are uneven, so that the slurry can generate the phenomena of decarburization, powder falling, cracks and the like.
The existing means for solving the problems is to increase the proportion of the adhesive in the process of preparing the slurry, but the function of the slurry is limited because the adhesive is mixed again in the mixed slurry to destroy the original formula; the problems are solved by parameters or speed of equipment, and the effects are limited; therefore, a new coating structure is required to solve the technical problem.
The first embodiment is as follows:
as shown in fig. 1, the pole piece coating structure provided by this embodiment includes: a substrate 1, a first conductive layer 2 and a first glue layer 3; the substrate 1 is a slurry support body and is used for bearing slurry, the substrate 1 of the positive pole piece can be an aluminum foil, and the substrate 1 of the negative pole piece can be a copper foil; the first conducting layer 2 is slurry and is arranged on one side surface of the substrate 1; the first glue layer 3 is arranged on the side face, far away from the substrate 1, of the first conducting layer 2, the first conducting layer 2 comprises a first glue body and a conductor mixed in the first glue body, and the material of the first glue body is the same as that of the first glue layer 3.
The production process of the pole piece coating structure of the embodiment is as follows:
the first conducting layer 2 is coated on the substrate 1, the first glue layer 3 is coated on the first conducting layer 2, and the coated pole piece coating structure is sent into a baking machine for drying treatment.
By adopting the technical scheme, the first adhesive layer 3 is coated on the side surface, far away from the substrate 1, of the first conductive layer 2, namely, in the baking process, the first conductive layer 2 is accommodated between the first adhesive layer 3 and the substrate 1, heat generated in the baking process cannot directly act on the first conductive layer 2, and meanwhile, the first adhesive layer 3 limits the electric conductor from falling off from the colloid or the colloid generates cracks; in addition, the material of first glue film 3 is the same with the material of the colloid of first conducting layer 2, has strengthened the cohesion between first glue film 3 and the first conducting layer 2, and the fusibility between the two is better simultaneously, has reduced the performance that influences first conducting layer 2.
Example two:
in this embodiment, the difference from the first embodiment is that: the first conductive layer 2 is continuously coated on the substrate 1, and the first adhesive layer 3 is continuously disposed on the first conductive layer 2, or, as shown in fig. 2, the first conductive layer 2 includes a plurality of first conductive units 21 intermittently coated on the substrate 1, and the first adhesive layer 3 is continuously disposed on the plurality of first conductive units 21. In particular, when the first conductive layer 2 and the first glue layer 3 are both coated continuously, the processing efficiency can be improved; when the first conductive layer 2 adopts an intermittent coating mode and the first adhesive layer 3 adopts a continuous coating mode, the plurality of first conductive units 21 are sequentially arranged, two adjacent first conductive units 21 are spaced at a preset distance, the first adhesive layer 3 covers the first conductive units 21 and simultaneously covers the space between the two adjacent first conductive units 21, namely, the margin area 4 is also covered by the first adhesive layer 3.
Through adopting above-mentioned technical scheme, first glue film 3 adopts the mode of continuous coating to locate on a plurality of first conducting layers 2 for when first conducting layer 2 adopted the intermittent type coating mode, the margin 4 between two adjacent first electrically conductive units 21 can receive the protection of first glue film 3, and continuous coating does benefit to the coating efficiency who improves first glue film 3 simultaneously.
Example three:
as shown in fig. 3, the present embodiment is different from the second embodiment in that: the first conductive layer 2 includes a plurality of first conductive units 21 intermittently coated on the substrate 1, and the first adhesive layer 3 includes a plurality of first adhesive layer units 31 coated on the first conductive units 21 in a one-to-one correspondence.
By adopting the technical scheme, the material of the first glue layer 3 can be saved by intermittent coating, and the manufacturing cost is reduced; in addition, a preset distance is arranged between two adjacent first adhesive layer units 31, so that an overlapped part is prevented from being generated between the two first adhesive layer units 31 in the gluing process, and the gluing amount of the coating surface of each first conductive unit 21 is kept consistent.
Further, the edge of each first glue layer unit 31 protrudes from the edge of the corresponding first conductive unit 21.
By adopting the technical scheme, the performance reduction caused by the fact that the first conductive unit 21 is not covered by the first glue layer unit 31 in the baking process is avoided.
Example four:
as shown in fig. 4, the present embodiment is different from the first embodiment in that: the pole piece coating structure further comprises a second conducting layer 5 arranged on the other side face of the substrate 1 and a second glue layer 6 arranged on the side face, far away from the substrate 1, of the second conducting layer 5, wherein the second conducting layer 5 comprises a second glue body and a conductor mixed in the second glue body, and the material of the second glue body is the same as that of the second glue layer 6. Specifically, in the present embodiment, the pole piece is double-coated, that is, two opposite sides of the substrate 1 are coated with the first conductive layer 2 and the second conductive layer 5, respectively, and the first conductive layer 2 and the second conductive layer 5 comprise the same conductor, and are either positive electrode active materials or negative electrode active materials.
The production process of the pole piece coating structure of the embodiment is as follows:
coating the first conductive layer 2 on one side surface of the substrate 1, coating the first adhesive layer 3 on the first conductive layer 2 by using a gluing device, and conveying the substrate 1 coated with the first conductive layer 2 and the first adhesive layer 3 into a baking machine for drying; after the first baking, the second conductive layer 5 is coated on the other side surface of the substrate 1, the second adhesive layer 6 is coated on the second conductive layer 5 by using a gluing device, and the substrate 1 coated with the first conductive layer 2, the first adhesive layer 3, the second conductive layer 5 and the second adhesive layer 6 is sent to a baking set for secondary baking.
Through adopting above-mentioned technical scheme for the pole piece is when two-sided coating, first conducting layer 2 and second conducting layer 5 all can receive the protection of first glue film 3 and second glue film 6, reduces to toast and influences the performance of first conducting layer 2 and second conducting layer 5, especially first conducting layer 2 needs to toast through the secondary.
Example five:
in the present embodiment, the difference from the fourth embodiment is that: the second conductive layer 5 is continuously coated on the substrate 1, or, as shown in fig. 5, the second conductive layer 5 includes a plurality of second conductive units 51 intermittently coated on the substrate 1, and the second adhesive layer 6 is continuously disposed on the plurality of second conductive units 51. In particular, when the second conductive layer 5 and the second adhesive layer 6 are both coated continuously, the processing efficiency can be improved; when the second conductive layer 5 adopts an intermittent coating mode and the second adhesive layer 6 adopts a continuous coating mode, the plurality of second conductive units 51 are sequentially arranged, two adjacent second conductive units 51 are spaced by a preset distance, the second adhesive layer 6 covers the second conductive units 51 and simultaneously covers the space between the two adjacent second conductive units 51, namely, the blank area 4 is also covered by the second adhesive layer 6.
By adopting the above technical scheme, the second adhesive layer 6 is arranged on the second conductive layer 5 in a continuous coating manner, so that the blank areas 4 between two adjacent second conductive units 51 can be protected by the second adhesive layer 6, and the continuous coating manner is favorable for improving the coating efficiency of the second adhesive layer 6; in addition, the design can ensure that the first conductive layer 2 and the second conductive layer 5 can be effectively protected in the secondary baking process.
Example six:
as shown in fig. 6, the present embodiment is different from the fifth embodiment in that: the second conductive layer 5 includes a plurality of second conductive units 51 intermittently coated on the substrate 1, and the second adhesive layer 6 includes a plurality of second adhesive layer units 61 coated on the second conductive units 51 in a one-to-one correspondence.
By adopting the technical scheme, the material of the second adhesive layer 6 can be saved by intermittent coating, and the manufacturing cost is reduced; in addition, a preset distance is arranged between two adjacent second adhesive layer units 61, so that an overlapped part is prevented from being generated between the two second adhesive layer units 61 in the gluing process, and the gluing amount of the coating surface of each second conductive unit 51 is kept consistent.
Further, the edge of each second glue layer unit 61 protrudes from the edge of the corresponding second conductive unit 51.
By adopting the technical scheme, the performance reduction caused by the fact that the second conducting layer 5 is not covered by the second glue layer 6 in the baking process is avoided.
Example seven:
in this embodiment, the differences from the first, second, third, fourth, fifth and sixth embodiments described above are: the thickness of the first glue layer 3 is equal to or less than that of the substrate 1, and the thickness of the first glue layer 3 is less than that of the second glue layer 6. Specifically, the thickness of the first adhesive layer 33 is 3-6um, and since the first conductive layer 2 needs to be baked for the second time, in order to prevent powder dropping and cracking and ensure that the quality of the pole piece and the subsequent process are not affected, the thickness of the first adhesive layer 3 needs to be reduced as much as possible, and the thickness of the first adhesive layer is kept as same as that of the substrate 1 or smaller than that of the substrate 1 as much as possible; in order to save cost and effectively and reasonably utilize, the second adhesive layer 6 can be coated with adhesive according to the coating thickness requirement, and the thickness of the second adhesive layer is 10-14 um.
Through adopting above-mentioned technical scheme, avoid the thickness of first glue film 3 and second glue film 6 to influence the quality and the manufacturing process of pole piece.
Example eight:
the embodiment provides a battery cell, and the battery cell includes the pole piece, and the pole piece includes substrate 1, sets up in the conducting layer of 1 at least one side of substrate to and set up the glue film on keeping away from substrate 1's the side of conducting layer. Specifically, the pole piece in this embodiment is cut from the pole piece coating structure in the first to seventh embodiments.
By adopting the technical scheme, the problems of decarburization, powder falling and cracks of the pole piece in the coating process are reduced, and the stability, reliability and capacity consistency of the battery are improved.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A pole piece coating structure, comprising:
a substrate;
the first conducting layer is arranged on one side surface of the substrate; and
the first adhesive layer is arranged on the side face, far away from the base material, of the first conducting layer;
the first conductive layer comprises a first colloid and a conductor mixed in the first colloid, and the material of the first colloid is the same as that of the first adhesive layer.
2. The pole piece coating structure of claim 1, wherein the first conductive layer is coated on the substrate continuously, or the first conductive layer comprises a plurality of first conductive units coated on the substrate intermittently, and the first glue layer is continuously disposed on the plurality of first conductive units.
3. The pole piece coating structure of claim 1, wherein the first conductive layer comprises a plurality of first conductive units intermittently coated on the substrate, and the first adhesive layer comprises a plurality of first adhesive layer units coated on the first conductive units in a one-to-one correspondence.
4. The pole piece coating structure of claim 3, wherein an edge of each of the first glue layer units protrudes beyond an edge of the corresponding first conductive unit.
5. The coating structure of any one of claims 1 to 4, further comprising a second conductive layer disposed on the other side of the substrate, and a second adhesive layer disposed on the side of the second conductive layer away from the substrate, wherein the second conductive layer comprises a second adhesive and a conductive material mixed in the second adhesive, and the material of the second adhesive is the same as the material of the second adhesive layer.
6. The pole piece coating structure of claim 5, wherein the second conductive layer is coated on the substrate continuously, or the second conductive layer comprises a plurality of second conductive units coated on the substrate intermittently, and the second glue layer is continuously disposed on the plurality of second conductive units.
7. The pole piece coating structure of claim 5, wherein the second conductive layer comprises a plurality of second conductive units intermittently coated on the substrate, and the second adhesive layer comprises a plurality of second adhesive layer units coated on the second conductive units in a one-to-one correspondence.
8. The pole piece coating structure of claim 7, wherein an edge of each of the second glue layer units protrudes beyond an edge of the corresponding second conductive unit.
9. The pole piece coating structure of claim 5, wherein the thickness of the first glue layer is equal to or less than the thickness of the substrate, and the thickness of the first glue layer is less than the thickness of the second glue layer.
10. The utility model provides an electric core, electric core includes the pole piece, its characterized in that, the pole piece includes the substrate, set up in the conducting layer of the at least one side of substrate, and set up in keeping away from of conducting layer the glue film on the side of substrate.
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| CN202021654820.XU CN213150813U (en) | 2020-08-10 | 2020-08-10 | Pole piece coating structure and battery cell |
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| CN202021654820.XU CN213150813U (en) | 2020-08-10 | 2020-08-10 | Pole piece coating structure and battery cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113560129A (en) * | 2021-06-09 | 2021-10-29 | 上海兰钧新能源科技有限公司 | Lithium battery substrate coating system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113560129A (en) * | 2021-06-09 | 2021-10-29 | 上海兰钧新能源科技有限公司 | Lithium battery substrate coating system and method |
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