CN219086187U - Pole piece and battery - Google Patents
Pole piece and battery Download PDFInfo
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- CN219086187U CN219086187U CN202122279334.5U CN202122279334U CN219086187U CN 219086187 U CN219086187 U CN 219086187U CN 202122279334 U CN202122279334 U CN 202122279334U CN 219086187 U CN219086187 U CN 219086187U
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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 application provides a pole piece and battery, wherein, the pole piece includes the electric current collector, and at least one surface of electric current collector includes first region and second region, and first region is the region that is equipped with the active layer, and the second region is the region that is not equipped with the active layer, and the second region is located first region, and the regional department of second is equipped with the utmost point ear. The second area is arranged in the first area, so that the manufacturing difficulty of the battery can be reduced.
Description
Technical Field
The application relates to the technical field of lithium ion batteries, in particular to a pole piece and a battery.
Background
Along with the rapid development of lithium ion battery technology, the lithium ion battery is widely applied to portable mobile electronic devices such as notebook computers, smart phones and the like, and the requirements of people on battery energy density are also higher. At present, in the manufacturing process of the battery, when an active layer on a pole piece is scraped, the pole piece is required to be scraped to the edge of the pole piece just to stop, the requirement on precision is high, and the manufacturing difficulty of the battery is high.
Disclosure of Invention
The embodiment of the application provides a pole piece and a battery, which solve the problem of high manufacturing difficulty of the battery.
To achieve the above objective, in a first aspect, an embodiment of the present application provides a pole piece, including a current collector, where at least one surface of the current collector includes a first area and a second area, the first area is an area provided with an active layer, the second area is located in the first area, and a tab is provided at the second area.
Optionally, the first region is provided with a through groove, the through groove is respectively adjacent to the second region and the side of the current collector in the length direction, and the tab is arranged in the second region and the through groove.
Optionally, the through groove is in a U-shape, and the minimum length of the through groove in the length direction of the current collector is greater than the width of the tab and less than the length of the second region.
Optionally, the minimum distance between the second boundary of the second region and the side of the current collector in the length direction ranges from 0.1mm to 5mm.
Optionally, the length of the second region in the length direction of the current collector is less than or equal to 50mm.
Optionally, the width of the second region in the current collector width direction is less than or equal to 50mm.
Optionally, the surface of the current collector includes a first surface and a second surface, the first surface and the second surface are opposite surfaces of the current collector, the first surface and the second surface are both provided with the first area and the second area, and the first surface is provided with a tab.
Optionally, the projection of the second region on the second face onto the first face is located within the second region on the first face.
Optionally, the area of overlap of the projection of the second region on the second face on the first face with the second region on the first face is less than 95% of the area of the second region on the first face.
In a second aspect, embodiments of the present application provide a battery comprising a pole piece according to the first aspect.
In this embodiment, the pole piece includes the electric current collector, and at least one surface of electric current collector includes first region and second region, and first region is the region that is equipped with the active layer, and the second region is the region that is not equipped with the active layer, and the second region is located first region, and the regional department of second is equipped with the utmost point ear. The second area is arranged in the first area, so that the manufacturing difficulty of the battery can be reduced.
Drawings
For a clearer description of the technical solutions in the embodiments of the present application, the following description will be given with reference to the accompanying drawings, which are only embodiments of the present application, and it is obvious to those skilled in the art that other drawings can be obtained from the listed drawings without inventive effort.
FIG. 1 is a schematic illustration of a pole piece according to an embodiment of the present disclosure;
FIG. 2 is a second schematic structural view of a pole piece according to an embodiment of the present disclosure;
FIG. 3 is a third schematic illustration of a pole piece according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a pole piece according to an embodiment of the present disclosure.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The following embodiments and features of the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the inventors, are within the scope of the present application, based on the embodiments herein.
Referring to fig. 1 and 2, the embodiment of the application provides a pole piece, including a current collector 1, at least one surface of the current collector 1 includes a first area 2 and a second area 3, the first area 2 is an area provided with an active layer, the second area 3 is an area not provided with an active layer, the second area 3 is located in the first area 2, and a tab is provided at the second area 3.
In particular, the material of the current collector 1 may be copper foil or aluminum foil, and the shape of the current collector 1 may be rectangular. The first region 2 and the second region 3 may be provided only at one surface of the current collector 1, or the first region 2 and the second region 3 may be provided at both surfaces of the current collector 1. The active layer may be made of a positive electrode active material or a negative electrode active material. The first region 2 surrounds the second region 3 such that the second region 3 is located within the first region 2. The second region 3 may be located at any position on the surface of the current collector 1, for example: the second area 3 may be located at an intermediate position of the surface of the current collector 1, the second area 3 may also be located at a position far to the left of the surface of the current collector 1, and the second area 3 may also be located at a position far to the right of the surface of the current collector 1. And a tab is arranged on the second region 3.
The shape of the second region 3 includes, but is not limited to, rectangle, trapezoid, circle, triangle, etc., and the second boundary line of the second region 3 may be a straight line or an irregular curve. The second region 3 is not provided with an active layer, and the thickness of the pole piece at the second region 3 is smaller than that of other regions on the pole piece. The second boundary is set to be a straight line, so that the manufacturing process of the second region 3 is relatively simple, and the production cost is reduced.
In this embodiment, the pole piece includes current collector 1, and at least one surface of current collector 1 includes first region 2 and second region 3, and first region 2 is the region that is equipped with the active layer, and second region 3 is the region that is not equipped with the active layer, and second region 3 is located first region 2, and second region 3 department is equipped with the utmost point ear. Through locating the second region 3 in the first region 2, in the battery manufacturing process, when scraping the active layer on the pole piece, need not just to scrape pole piece edge and stop to the requirement to the precision in the manufacturing process has been reduced, and then the manufacturing degree of difficulty of battery has been reduced. In addition, the tab is disposed at the second region 3, so that the thickness of the battery tab can be reduced, thereby improving the battery energy density.
Alternatively, referring to fig. 4, the first region 2 is provided with a through groove 4, and the through groove 4 is adjacent to the second region 3 and the current collector in the longitudinal direction, and the tab 5 is provided in the second region 3 and the through groove 4.
In particular, the shape of the through slot 4 includes, but is not limited to, rectangular, trapezoidal. Through grooves 4 can be formed in a fluid-collecting mode through cutting portions, and through the additionally arranged through grooves 4, the thickness of the battery lug can be reduced, and then the battery energy density is improved.
Alternatively, referring to fig. 4, the through groove 4 is provided in a U shape, and the minimum length of the through groove 4 in the length direction of the current collector is greater than the width of the tab and less than the length of the second region 3. By defining the minimum length of the through groove 4 in the current collector length direction to be greater than the width of the tab 5 and less than the length of the second region 3, the thickness at the tab of the battery can be reduced, thereby improving the battery energy density.
Optionally, the surface of the current collector 1 includes a first surface and a second surface, the first surface and the second surface are opposite two surfaces of the current collector 1, the first surface and the second surface are both provided with the first area 2 and the second area 3, and the tab is disposed on the first surface. By providing the first region 2 and the second region 3 on both the first face and the second face of the current collector 1, the thickness of the battery tab can be further reduced, and the battery energy density can be further improved.
Alternatively, the minimum distance between the second boundary of the second region 3 and the side of the current collector 1 in the length direction may have a value ranging from 0.1mm to 5mm.
Referring to fig. 1, in the case where the shape of the second region 3 is square, the distance between the second boundary and the side of the current collector 1 in the length direction may be a first distance a1 and a second distance a2, and if the first distance a1 is greater than the second distance a2, the minimum distance between the second boundary and the side of the current collector 1 in the length direction is the second distance a2, and the value of the second distance a2 ranges from 0.1mm to 5mm; if the first distance a1 is smaller than the second distance a2, the minimum distance between the second boundary and the side of the current collector 1 in the length direction is the first distance a1, and the value of the first distance a1 ranges from 0.1mm to 5mm.
In particular, the minimum distance between the second boundary and the side of the current collector 1 in the length direction may be 0.1mm, 1.1mm, 2.4mm, 3mm, 4.5mm, 5mm, or the like.
The manufacturing difficulty of the battery can be further reduced by defining the minimum distance between the second boundary and the side of the current collector 1 in the length direction to be in the range of 0.1mm to 5mm.
Optionally, the length of the second region 3 in the length direction of the current collector 1 is less than or equal to 50mm.
In particular, the length of the second region 3 in the length direction of the current collector 1 may be 1mm, 2mm, 5.5mm, 10mm, 14.6mm, 22mm, 27mm, 30mm, 33.8mm, 41mm, 45mm, 50mm. By defining the length of the second region 3 in the length direction of the current collector 1, the thickness of the battery tab can be reduced while the battery energy density is compromised, thereby improving the battery energy density.
Alternatively, the width of the second region 3 in the width direction of the current collector 1 is less than or equal to 50mm.
In particular, the width of the second region 3 in the width direction of the current collector 1 may be 1mm, 2mm, 5.5mm, 10mm, 14.6mm, 22mm, 27mm, 30mm, 33.8mm, 41mm, 45mm, 50mm. By defining the width of the second region 3 in the width direction of the current collector 1, the thickness at the battery tab can be reduced while taking into account the battery energy density, thereby improving the battery energy density.
Optionally, the projection of the second area 3 on the second face onto the first face is located within the second area 3 on the first face.
In particular, after the active layers are coated on the first surface and the second surface, the active layer in the second area 3 is scraped off by a tool, such as a doctor blade, so as to obtain the pole piece provided in the embodiment of the present application. After the active layer in the second area 3 of the first surface is scraped first, an active layer step appears at the second boundary of the second area 3 of the first surface, if the active layer in the second area 3 of the second surface is scraped, the scraping tool scrapes the position of the second boundary corresponding to the active layer step on the second surface, and the current collector 1 is easy to break, so that the situation that the current collector 1 breaks in the manufacturing process of the pole piece can be avoided by limiting the projection of the second area 3 on the second surface on the first surface to be positioned in the second area 3 on the first surface.
Furthermore, by defining that the projection of the second region 3 on the second surface onto the first surface is located within the second region 3 on the first surface, it is possible to make the connection of the tab with the second region 3 on the current collector 1 more stable when the tab is provided on the second region 3.
Further, the area of overlap of the projection of the second area 3 on the second face on the first face with the second area 3 on the first face is less than 95% of the area of the second area 3 on the first face.
In a specific implementation, the area of overlap of the projection of the second region 3 on the second surface on the first surface and the second region 3 on the first surface may be 68%, 77%, 80%, 91%, 93%, 95% of the area of the second region 3 on the first surface, or the like. By defining the projection of the second region 3 on the second surface on the first surface to overlap the second region 3 on the first surface by less than 95% of the area of the second region 3 on the first surface, the tab can be more firmly connected with the second region 3 on the current collector 1 when the tab is provided on the second region 3.
The embodiment of the application also provides a method for manufacturing the pole piece.
In the prior art, when the pole piece is cleaned from the middle, on one hand, the paste can be adhered to the paste on one side of the terminal of the scraper path, and the negative pressure or hairbrush and other methods cannot effectively remove waste materials, so that the problems of dust pollution, short circuit, abnormal K value and even safety of the battery cell are finally caused; on the other hand, the terminal side slot edge requires more margin due to the design of the length of the paste bonding blade, resulting in partial energy density loss. And poor uniformity of the length of the wiper area ultimately results in poor uniformity of the battery. The method for manufacturing the pole piece of the embodiment of the application effectively solves the problems from the source by optimizing the scraper motion logic.
As an example, taking a common scraper as an example, a single-groove cleaning process refers to a process from an initial state to exposing a qualified current collector in a certain area to be cleaned, and in the process, a lower cutter surface is in single-line contact with a pole piece. The key technical points of the method for manufacturing the pole piece in the embodiment of the application provided by the embodiment of the application are as follows:
1. in the single groove cleaning process, at least two times of cutter feeding and one time of displacement are carried out;
2. in the single slot cleaning process, at least two lower cutters are arranged at the boundary of the length (or width) direction of the slot;
3. in the single groove cleaning process, at least two scraper movements are overlapped on a vector movement path, and the length of an overlapped area is L which is more than or equal to 0;
4. during or after the single tank cleaning process, the waste material generated by the process is generally cleaned and collected in combination with, but not limited to, contact or non-contact dust removal;
the groove (namely the second area 3) manufactured by the key technical points has good surface state, clear groove boundary and no difference between tab welding tension and empty foil welding tension. Through changing the scraper motion logic during cleaning, the situation that the slot boundaries are not flush or remain is avoided, and the middle cleaning pole piece becomes practical from theory. Simple operation, easy realization and obvious improvement effect.
As another example, referring to fig. 1 and 3, key technical points of the method for manufacturing the pole piece according to the embodiment of the present application provided in the embodiment of the present application are as follows:
1. the pole piece of the lithium ion battery comprises a positive pole current collector, a negative pole current collector and an active substance coated on the current collector, wherein at least one groove (namely the second area 3) is formed on the pole piece and used for welding the pole lug, and the groove is formed by separating paste from the current collector by using a physical method similar to scraping, wiping and the like or a special method such as laser, foaming glue and the like;
2. applying paste in a designated area to separate from the current collector to form a groove by using a physical method similar to a scraper, wiping or the combination, wherein the distance between the edge of the finished product groove and the boundary line between the paste and the base material (the edge of a pole piece if the base material is not present) is b, and b is more than or equal to 0;
3. in the single tank cleaning process, the tank positions are L1 and L2 or L3 or L4 at the boundary in the same direction, and each boundary is provided with at least one cutter. The mode can translate to two boundaries for cutting through the same cutter through driving elements such as a motor, a cylinder and the like; the cutter can be cut off at the boundary of the slot position by two cutters of two stations; two knives with the distance of the cutting edge c or d on the same station can be used for cutting;
4. in the cleaning process, after the cutter is placed at the boundary of the groove in the same direction, at least one cleaning unit translates. The specific implementation mode can be that the cutter with the width d of the same station is translated from the position L1 to the position L2 in the cutter-descending state after the cutter is arranged at the positions L1 and L2, so that the cleaning is realized; or the dust-free paper is used for translational erasure from a plurality of directions, and the total translational vector distance is more than d to realize cleaning;
5. in the cleaning process, at least two cleaning unit movements (only the cutter is not moved and the motion is calculated once) are overlapped on a vector motion path, and the length of an overlapped area is L, wherein L is more than or equal to 0; the realization mode can be that a knife with the width d of the same station is arranged at the position L1, the distance of c/2 is translated from the direction L1 to the direction L2, then the knife is arranged at the position L2, the distance of 3c/4 or more is translated from the direction L2 to the direction L1, and at the moment, L=c/4; the lower cutter at the position L1 does not translate, and the lower cutter at the position L2 translates a distance c in the direction from L2 to L1, wherein c=0; the lower knife at the L1 position can not translate, the lower knife at the L2 position translates to the distance of c/2, and the remaining c/2 is wiped off by dust-free cloth;
6. the above-described cleaning process is typically used in conjunction with, but not limited to, contact or non-contact dust removal to clean and collect waste materials generated by the process. Can follow up vacuum dust collection in the cleaning process; the waste materials can be collected by turning over the pole piece by more than 90 degrees or by a brush after the cleaning is finished.
The grooves (the grooves are the second areas 3) manufactured through the key technical points are good in surface state, clear in groove boundary, free of macroscopic waves and residues, and free of difference between tab welding tension and empty foil welding tension.
The embodiment of the application also provides a battery, which comprises the pole piece provided by the embodiment of the application. The structure and working principle of the pole piece provided in the embodiment of the present application may refer to the above embodiment, and are not described herein again. Because the battery provided by the embodiment of the application comprises the pole piece provided by the embodiment of the application, the battery provided by the embodiment of the application has all the beneficial effects of the pole piece provided by the embodiment of the application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
Claims (9)
1. The pole piece is characterized by comprising a current collector, wherein at least one surface of the current collector comprises a first area and a second area, the first area is an area provided with an active layer, the second area is an area not provided with the active layer, the second area is positioned in the first area, and a pole lug is arranged at the second area; the first region is provided with a through groove, the through groove is respectively adjacent to the second region and the side of the current collector in the length direction, and the tab is arranged in the second region and the through groove.
2. The pole piece of claim 1, wherein the through slot is provided in a U-shape, and a minimum length of the through slot in a length direction of the current collector is greater than a width of the tab and less than a length of the second region.
3. The pole piece of claim 1, wherein the minimum distance between the second boundary of the second region and the side of the current collector in the length direction is in the range of 0.1mm to 5mm.
4. The pole piece of claim 1, wherein the second region has a length in the length direction of the current collector of less than or equal to 50mm.
5. The pole piece of claim 1, wherein the width of the second region in the current collector width direction is less than or equal to 50mm.
6. The pole piece of claim 1, wherein the surface of the current collector comprises a first face and a second face, the first face and the second face being opposite faces of the current collector, the first face and the second face each being provided with the first region and the second region, the first face being provided with a tab.
7. The pole piece of claim 6, wherein the projection of the second region on the second face onto the first face is located within the second region on the first face.
8. The pole piece of claim 7, wherein the projected area of the second region on the second face onto the first face overlaps the second region on the first face by less than 95% of the area of the second region on the first face.
9. A battery comprising a pole piece according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122279334.5U CN219086187U (en) | 2021-09-18 | 2021-09-18 | Pole piece and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122279334.5U CN219086187U (en) | 2021-09-18 | 2021-09-18 | Pole piece and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219086187U true CN219086187U (en) | 2023-05-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122279334.5U Active CN219086187U (en) | 2021-09-18 | 2021-09-18 | Pole piece and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219086187U (en) |
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2021
- 2021-09-18 CN CN202122279334.5U patent/CN219086187U/en active Active
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