CN112207165A - Lithium ion battery, pole piece and tab forming process and equipment - Google Patents
Lithium ion battery, pole piece and tab forming process and equipment Download PDFInfo
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- CN112207165A CN112207165A CN202010731344.5A CN202010731344A CN112207165A CN 112207165 A CN112207165 A CN 112207165A CN 202010731344 A CN202010731344 A CN 202010731344A CN 112207165 A CN112207165 A CN 112207165A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008569 process Effects 0.000 title claims abstract description 27
- 239000011248 coating agent Substances 0.000 claims abstract description 54
- 238000000576 coating method Methods 0.000 claims abstract description 54
- 238000005520 cutting process Methods 0.000 claims abstract description 48
- 239000011149 active material Substances 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims description 34
- 238000004804 winding Methods 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 14
- 230000002349 favourable effect Effects 0.000 description 5
- 238000005524 ceramic coating Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000005030 aluminium foil Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention relates to the field of lithium ion batteries, and discloses a lithium ion battery, a pole piece and tab forming process and equipment. The process comprises the following steps: conveying the pole piece along the length extension direction of the pole piece, wherein the pole piece comprises a current collector, the surface of the current collector is provided with a coating area and a pole lug area, the pole lug area is positioned at the length edge of the coating area, the coating area is coated with a polar active material, the pole lug area is a current collector exposed area which is not coated with the polar active material, a roller of a roller device is pressed on the surface of the pole lug area of the pole piece passing under the roller with preset pressure, the surface of the roller is provided with convex grains, the surface of the pole lug area is provided with convex grains which are staggered with the convex grains of the roller, and the grains of the pole lug area or the extension line of the pole lug area are intersected with the boundary line between the pole; the die cutting device cuts the pole lug area of the pole piece passing through the cutting die, a pole lug extending out of the length edge of the pole piece is formed on the pole lug area, and a plurality of pole lugs are formed on the length edge of the pole piece positioned at the rear end of the die cutting device.
Description
Technical Field
The invention relates to the field of lithium ion batteries, and discloses a lithium ion battery, a pole piece and tab forming process and equipment.
Background
At present, with the development of new energy industry, energy storage application scenes are more common, peak shaving and frequency modulation of energy storage, power supply in emergency occasions, commercial application of peak shaving and valley filling of power grids, power supply application of mobile electricity supplementing vehicles and base stations and the like, and the application of high-capacity lithium ion batteries is wider and wider.
The battery core is formed by winding positive and negative pole pieces and a diaphragm, and the forming process flow of the pole pieces mainly comprises the following steps: the method comprises the five working procedures of pulping, coating, rolling, die cutting and slitting.
The inventor discovers that the pole lugs of the pole pieces after die cutting have the risk of being folded back in the research process of the invention, so that the battery cell cannot reach the calibrated capacity.
Disclosure of Invention
One of the objectives of the embodiments of the present invention is to provide a lithium ion battery, a pole piece, and a tab forming process and apparatus, which are beneficial to improving the extension strength of a tab and reducing the tab turn-back situation.
In a first aspect, a process for forming a tab of a lithium ion battery electrode plate according to an embodiment of the present invention includes:
the length extending direction conveying of edge pole piece the pole piece, the pole piece includes the mass flow body there are coating district and utmost point ear district on the surface of mass flow body, utmost point ear district is located the length border in coating district, the coating has polarity active material on the coating district, utmost point ear district is for not coating the exposed district of mass flow body of polarity active material,
the roller of the roller device is pressed on the surface of a pole lug area of the pole piece passing under the roller by preset pressure, the surface of the roller is provided with raised grains, raised grains staggered with the raised grains of the roller are formed on the surface of the pole lug area, and the grains of the pole lug area or the extension line thereof are intersected with the boundary line between the pole lug area and the coating area;
the die cutting device cuts the pole lug area of the pole piece passing through the cutting die, a pole lug extending out of the length edge of the pole piece is formed on the pole lug area, and a plurality of pole lugs are formed on the length edge of the pole piece located at the rear end of the die cutting device.
Optionally, the two length edges of the coating area are respectively provided with one polar lug area, and the roller device is respectively arranged above each polar lug area.
Optionally, the pole lug area is arranged on one length edge of the coating area, and the roller devices are respectively arranged above the pole lug area.
Optionally, the surface of the roller is provided with a mesh shape formed by crossed lines,
the lines on the surface of the polar ear region are in a net shape formed by crossed lines.
Optionally, the surface of the roller is in a net shape formed by intersecting lines of a group of parallel grain lines and another group of parallel grain lines;
the lines on the surface of the polar ear area are in a net shape formed by intersecting lines of one group of parallel line routes and the other group of parallel line routes.
Optionally, the distance between the parallel lines of each group is equal.
7. The process of claim 1, wherein the step of forming the electrode tab comprises the steps of,
the lines protruding on the surface of the roller are parallel.
The lines protruding on the surface of the polar lug area are parallel.
8. The process of claim 7, wherein the step of forming the electrode tab comprises the steps of,
the grain lines of the protrusions on the surface of the roller and the grain lines of the protrusions on the surface of the polar lug area intersect with the boundary line between the polar lug area and the coating area.
9. The process of claim 8, wherein the step of forming the electrode tab comprises the steps of,
the grain lines of the protrusions on the surface of the roller and the grain lines of the protrusions on the surface of the polar lug area are perpendicular to the boundary line between the polar lug area and the coating area.
10. The process of claim 1, wherein the step of forming the electrode tab comprises the steps of,
the distance between any two adjacent lugs is different.
In a second aspect, an embodiment of the present invention provides a lithium ion battery pole piece manufactured by the tab forming process for a lithium ion battery pole piece according to any one of claims 1 to 10.
In a third aspect, an embodiment of the present invention provides a tab forming apparatus for a lithium ion battery pole piece, including: a guide roll transmission mechanism, a roller device and a die cutting device,
the guide roller transmission mechanism comprises a plurality of guide rollers for conveying the pole pieces on the guide rollers along the length extension direction of the pole pieces;
the roller device is positioned at the front end of the die cutting device and comprises a roller, the roller is positioned above one guide roller, raised grains are arranged on the surface of the roller, and the grains are intersected with the conveying direction of the guide roller;
die cutting device installs gyro wheel device's rear end, die cutting device includes mould and lower mould be provided with the edge of a knife on the arbitrary opposite face of mould, lower mould, work as when mould, lower mould are closed relatively, edge of a knife cross cutting is located go up the utmost point ear district of the pole piece between mould, the lower mould, with form in the utmost point ear district and stretch out the utmost point ear at the length border of pole piece.
13. The electrode tab forming device of the lithium ion battery electrode plate of claim 12,
the lines on the surface of the roller are in a net shape formed by crossed lines,
14. the electrode tab forming device of the lithium ion battery electrode plate of claim 13,
the lines on the surface of the roller are in a net shape formed by intersecting lines of one group of parallel line lines and the other group of parallel line lines;
15. the electrode tab forming device of the lithium ion battery electrode plate of claim 14,
the distances between the parallel lines of the lines are equal.
16. The electrode tab forming device of the lithium ion battery electrode plate of claim 12,
the lines protruding on the surface of the roller are parallel.
17. The electrode tab forming device of the lithium ion battery electrode plate of claim 16,
the lines protruding on the surface of the roller are intersected with the conveying direction of the guide roller.
18. The electrode tab forming device of the lithium ion battery electrode plate of claim 17,
the lines protruding on the surface of the roller are vertical to the conveying direction of the guide roller.
19. The electrode tab forming device of the lithium ion battery electrode plate of claim 12,
the surface of the roller is a ceramic coating.
20. The electrode tab forming device of the lithium ion battery electrode plate of claim 19,
the main body of the roller is made of aluminum alloy, and the outer surface of the main body is further coated with the ceramic coating.
In a fourth aspect, an embodiment of the present invention provides a lithium ion battery pole piece, including:
the surface of a coating area of the current collector is coated with a polar active material, a plurality of lugs extend out of the length edge of the coating area, the polar active material is not coated on each lug, and the current collector is exposed outside,
convex grains are formed on each electrode lug respectively, and the grains or the extension lines of the grains are intersected with the boundary line between the electrode lug area and the coating area.
22. The lithium ion battery pole piece of claim 21,
and a plurality of tabs are respectively arranged on two length edges of the coating area.
23. The lithium ion battery pole piece of claim 22,
the lugs at the two length edges of the coating area are mirror images.
24. The lithium ion battery pole piece of claim 21,
and a plurality of tabs are arranged on one length edge of the coating area.
25. The lithium ion battery pole piece of claim 21,
the lines on the surface of the tab are in a net shape formed by crossed lines.
26. The lithium ion battery pole piece of claim 25,
the grains on the surface of the tab are in a net shape formed by intersecting lines of one group of parallel grain lines and the other group of parallel grain lines.
27. The lithium ion battery pole piece of claim 26,
the distances between the parallel lines of the lines are equal.
28. The lithium ion battery pole piece of claim 21,
the lines protruding on the surface of the polar lug area are parallel.
29. The lithium ion battery pole piece of claim 28,
the lines protruding on the surface of the tab are intersected with the boundary line between the tab and the coating area.
30. The lithium ion battery pole piece of claim 29,
the lines protruding on the surface of the tab are perpendicular to the boundary line between the tab and the coating area.
31. The lithium ion battery pole piece of claim 21,
the distance between any two adjacent lugs is different.
In a fifth aspect, an embodiment of the present invention provides a lithium ion battery, including a battery cell, where the battery cell is formed by winding a positive plate, a negative plate, and a separator, and either or both of the positive plate and the negative plate are the plate described in any one of claims 21 to 30.
Therefore, by applying the technical scheme of the embodiment, the roller device is further arranged at the front end of the die cutting device, raised grains are pressed on the surface of the pole lug area of the pole piece before die cutting, and the pole lug is die-cut after pressing, so that the surface of each pole lug formed by die cutting is respectively provided with the raised grains which are intersected with the boundary line between the pole lug and the coating area (the situation of being parallel is eliminated), and the reinforcing ribs which are intersected with the boundary line between the pole lug and the coating area are formed on the pole lug, thereby improving the rigidity strength of the pole lug in the extension direction and avoiding the problem of pole lug turning back after the pole piece is die-cut in the prior art.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic view of a processing principle of a tab forming apparatus provided in embodiment 1 of the present invention;
FIG. 2 is a perspective view of FIG. 1 from another perspective;
FIG. 3 is a schematic top view of the structure of FIG. 1;
FIG. 4 is a schematic side view of the structure of FIG. 1;
fig. 5 is a schematic view illustrating a processing principle of a tab forming apparatus according to comparative example 1 of the present invention;
reference numerals:
1: a roller device; 11: a roller; 111: lines on the surface of the roller;
2: a die cutting device; 21: a lower die; 22: an upper die;
3: an unwinding mechanism; 4: a winding mechanism; 5: a coating area;
6: a polar ear region; 61: raised lines in the tab area; 62: a tab; 7: and a guide roller.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
Example 1:
see fig. 1-4.
The embodiment provides a tab forming device of a lithium ion battery pole piece, an application process of the device and a manufactured pole piece.
The pole lug forming equipment of the lithium ion battery pole piece mainly comprises a guide roller transmission mechanism, a roller device 1 and a die cutting device 2, wherein an unreeling mechanism 3 and a reeling mechanism 4 are further arranged on the equipment of the embodiment, the unreeling mechanism 3 is used for placing a pole piece roll to be processed, when the pole piece forming equipment is used, a coated pole piece is reeled on the unreeling mechanism 3, the pole piece structure at the moment is that a base material of the pole piece is a current collector, a coating area 5 is arranged on the current collector, a polar active material layer is coated on the coating area 5, a non-coating area is arranged on the length edge of the coating area 5 and is an exposed area so as to serve as a pole lug cutting area, the pole lug protruding out of the length edge of the coating area 5 is formed by cutting in the area, and the non-coating area is generally marked as a pole lug area 6. In a large-capacity wound lithium ion battery, a plurality of discrete tabs are arranged on the side of the length edge of each pole piece, and the number of tabs required for increasing the discharge rate is increased as the capacity is increased, so that the output impedance is reduced, and the discharge heat of the battery is reduced.
In addition, the coating region 5 is also provided to be continuous along the length direction of the pole piece to improve gram capacity of the lithium ion battery, and accordingly, the tab region 6 is continuous along the length direction of the pole piece.
And the winding mechanism 4 is used for winding the pole piece subjected to die cutting to form the pole lug into a roll.
The guide roller transmission mechanism is installed between the unwinding mechanism 3 and the winding mechanism 4, the guide roller transmission mechanism comprises a plurality of guide rollers 7, the number of the guide rollers 7 is determined according to the distance between the unwinding mechanism 3 and the winding mechanism 4, the width of a pole piece and the body density, the longer the distance is, the larger the width of the pole piece is, the larger the density of the unit volume of a single battery cell is, the more the number of the guide rollers 7 is, and the narrower the interval between the two adjacent guide rollers 7 is. The working principle is that the guide rollers 7 are arranged at the pole piece passing position between the unwinding mechanism 3 and the winding mechanism 4, the pole pieces coming out of the unwinding mechanism 3 pass through the guide rollers 7, sequentially pass through the roller device 1 and the die cutting device 2 under the guiding and supporting of the guide rollers 7, reach the winding mechanism 4, and are wound at the winding mechanism 4.
Roller device 1 is located 2 front ends of cutting device and makes the pole piece get into cutting device 2 before reaching roller device 1 earlier, roller device 1 includes gyro wheel 11, this gyro wheel 11 is installed in the top of a guide roll 7, surface at gyro wheel 11 has bellied line 111, set up the gyro wheel into the structure that liftable was adjusted in this embodiment, according to the thickness of the mass flow body of current pole piece when using, adjust the height of gyro wheel 11, make the clearance between gyro wheel 11 and the guide roll 7 that is located the gyro wheel below slightly be less than the thickness of the mass flow body of pole piece. The working principle of the roller device 1 is that a pole piece coming out of the unreeling mechanism 3 is guided by the guide roller 7 of the guide roller transmission mechanism to pass through a gap between the roller 11 and the guide roller 7 opposite to the roller 11, the roller 11 is pressed on the surface of the pole lug area 6 of the pole piece passing below the roller 11 with a certain pressure, a raised grain 61 staggered with the raised grain 111 on the surface of the roller 11 is formed on the surface of the pole lug area 6 of the pole piece, namely the raised grain 111 on the surface of the roller 11 is pressed on the surface of the pole lug area 6 of the pole piece to form a concave position, so that a grain 61 raised relative to the concave position is formed beside the concave position, and the grain on the pole lug area 6 of the pole piece or the extension line of the grain is intersected with the boundary line between the pole lug area 6 and the coating area, namely the boundary line of the pole piece is. The roller 11 is kept to be pressed on the surface of the pole ear area 6 with preset pressure, the long-strip-shaped pole piece passes under the roller 11 of the roller device 1, and the pole ear area 6 of the pole piece coming out from the lower part of the roller 11 is provided with an indentation which is continuous along the length direction of the pole piece and is provided with a convex texture 61.
The pole piece coming out of the roller 11 is further conveyed forward under the guidance of the guide roller 7 conveying device to reach the die cutting device 2, passes between the lower die 21 and the upper die 22 of the die cutting device 2, a knife edge with a preset shape is arranged on either the bottom surface of the upper die 22 or the top surface of the lower die 21, and when the lower die 21 and the upper die 22 are oppositely closed, the knife edge acts on the lug area 6 to cut the lug area 6 and leave a lug 62 extending in the length direction of the coating area. The strip-shaped continuous pole piece passes through the space between the upper die 22 and the lower die 21 of the die cutting device 2, the die cutting time of the upper die 22 of the lower die 21 is controlled according to the speed of the guide roller transmission mechanism, so that a plurality of pole lugs 62 which are arranged side by side along the length direction of the pole piece are formed on the pole lug area 6 of the pole piece which is out of the die cutting device 2, intervals are arranged between any two adjacent pole lugs 62, and the intervals between the two adjacent pole lugs 62 are determined according to the specification of the current winding battery cell. In the wound lithium ion battery of the present embodiment, after winding, the tabs on the positive electrode sheet on the wound body are stacked and aligned to form an integral positive electrode tab, and the tabs on the negative electrode sheet are stacked and aligned to form an integral negative electrode tab.
The pole pieces coming out of the die cutting device 2 further reach the winding mechanism 4 under the guidance of the guide roller 7 of the guide roller transmission mechanism, and are wound on the winding mechanism 4 so as to be processed in the next process. In addition, the unwinding mechanism 3 and the winding mechanism 4 are provided in this embodiment as an example, but the present invention is not limited to this. The pole piece of the previous process can be directly connected to the guide roller transmission mechanism of the embodiment without limitation, and processed by the tab forming equipment of the embodiment, and after processing, the pole piece can be directly transmitted to the next process without being wound.
Therefore, by applying the technical scheme of the embodiment, as the roller device is further arranged at the front end of the die cutting device 2, raised grains are pressed on the surface of the tab area 6 of the pole piece before die cutting, and the tab die cutting is performed after the pressing, so that the surface of each tab 62 formed by die cutting is respectively provided with the raised grains 61 intersected with the boundary line between the tab 62 and the coating area (excluding the parallel situation), and reinforcing ribs intersected with the boundary line between the tab 62 and the coating area are formed on the tab 62, the rigidity strength of the tab 62 in the extension direction is improved, and the problem of the return of the tab 62 after the pole piece die cutting in the prior art is avoided.
As an illustration of the present invention, but not limited to, the raised texture 111 on the surface of the roller 11 may be set to be a mesh formed by intersecting lines, and correspondingly, raised mesh texture which is staggered with the mesh on the surface of the roller 11 is formed on the tab region 6 of the pole piece.
For example, but not limited to, the raised network of the surface of the roller 11 is formed by intersecting one set of parallel raised grain lines with another set of parallel raised grain lines. Correspondingly, the convex net shape on the surface of the pole lug area 6 of the pole piece is formed by intersecting one group of parallel convex grain lines with the other group of parallel convex grain lines. In each group of parallel raised grain lines, the spacing between the grain lines may be the same or different. The spacing between the two groups of parallel raised grain lines can be the same or different.
It is also possible, but not limited to, to arrange the raised ridges 111 on the surface of the roller 11 in parallel raised ridge paths, and accordingly, to form mutually parallel raised ridge paths on the tab region 6 of the pole piece that are staggered with respect to the network of the surface of the roller 11. It is preferable but not limited to that the grain lines protruded on the surface of the roller 11 and the grain lines protruded on the surface of the tab zone 6 are perpendicular to the boundary line between the tab zone 6 and the coating zone. Experiments prove that the design of the vertical angle is favorable for improving the rigidity strength of the tab 62 in the extension direction of the tab 62, improving the straightness of the tab 62 and further being favorable for avoiding the turn-back of the tab 62.
Similarly, the distances between the parallel raised grain lines on the surface of the roller 11 may be the same or different, and correspondingly, the distances between the parallel raised grain lines formed on the tab region 6 of the pole piece may be the same or different.
As an illustration of this embodiment, the tab forming apparatus structure of this embodiment is applicable to various pole pieces:
for example, in the current pole piece structure, a pole lug area 6 is arranged on the length edge of one side of the coating area of the pole piece, and then a roller 11 is arranged in the pole lug forming device of this embodiment, and the roller 11 is arranged above the pole lug area 6.
For example, in the current pole piece structure, when one pole lug area 6 is respectively disposed at the length edges of the two sides of the coating area of the pole piece, two roller devices 1 are disposed in the pole lug forming device of this embodiment, and the two roller devices 1 are respectively located above the pole lug areas 6 on the two sides. By adopting the scheme, the pole pieces can be further cut along the central line of the width of the pole pieces after the pole lug forming process, the pole pieces are cut into two pole pieces, the length of the pole pieces obtained by cutting is the same as that of the pole pieces before cutting, and the width of the pole pieces is half of that of the original pole pieces. A row of discrete tabs 62 is provided on one side of each pole piece.
As an illustration of the present embodiment, the roller 11 of the roller device 1 of the present embodiment may have a shape similar to a gear, the main body of the roller 11 may be, but is not limited to, made of aluminum alloy (such as, but not limited to, AL60601 aluminum), and ceramic coating is electroplated on the outer surface of the main body of the roller 11, so that the ceramic coating contacts the pole piece. This scheme of adoption is favorable to alleviateing 11 weight of gyro wheel, reduces 11 rotation inertia of gyro wheel, still is favorable to reducing the friction between 11 and the utmost point ear district 6 of gyro wheel, and avoids producing the metal cuttings and then influence the performance of lithium ion battery electricity core because the friction.
As an illustration of the present embodiment, the roller device 1 is configured to be adjustable to adjust the pressure of the roller 11 on the tab region 6 to adjust the depth of the concave formed on the tab region 6 and the height of the convex strip dislocated from the concave.
It should be noted that the technical solution of the present embodiment is applicable to both the positive electrode sheet and the negative electrode sheet. For example, when the pole piece is a positive pole piece, the current collector of the pole piece is an aluminum foil, and the polar active material is a positive active material; when the pole piece is a negative pole piece, the current collector is a copper foil piece, and the polar active material is a negative active material.
As an indication of this embodiment, a deviation rectifying device is further disposed on the guide roller transmission mechanism of this embodiment, and the deviation rectifying device is mounted above the guide roller 7, and is configured to detect the position of the pole piece on the guide roller 7 in real time, and transmit the detection data to the control system in real time, so as to automatically adjust the angle of the guide roller when the transmission direction of the pole piece deviates from a predetermined error range, thereby achieving automatic deviation rectification.
Further experimental explanations were made to further facilitate the understanding of the present invention by the present inventors.
The following takes an example of preparing a pole piece for a lithium ion battery cell with specification 2714895, wherein the thickness of the battery cell is 27mm, the width W of the battery cell is 148mm, and the height of the battery cell is 95 mm.
The test materials were: the positive plate, the mass flow body of pole piece is the aluminium foil, the thickness of aluminium foil is 13 μm, the polar active material of coating district surface is 6-8 μm, adopt two-sided coating technology, be provided with respectively on the both lengths border of the coating district of the pole piece of this embodiment along the continuous utmost point ear district 6 of length direction of pole piece, the width of utmost point ear district 6 is 17.5mm, after forming utmost point ear 62 at the both lengths border cross cutting of this pole piece, cut the pole piece along the width direction's of pole piece central line, form two pole pieces, the length of pole piece is 5087 mm.
Experimental example 1:
the pole piece is processed by the pole lug forming equipment shown in fig. 1-4, and a color code sensor is arranged on a guide roller transmission mechanism behind a die cutting device so as to calculate the number of the pole lugs on the edge side of each length of the pole piece in real time.
Comparative example 1:
referring to fig. 5, the difference of the tab forming apparatus used in this comparative example from experimental example 1 is that the tab forming apparatus of this embodiment is not provided with a roller device, and the surface of the tab of the processed pole piece is flat. The material, preparation process and structure of the pole piece are the same as those of experimental example 1.
And (4) test conclusion:
through production data statistical analysis, the turnover rate of the non-knurled lug is 5% when the non-knurled lug is wound, the turnover rate of the lug rolled by the rolling device in the winding process is 0.01%, and the technical scheme of the embodiment is favorable for greatly improving the turnover rate of the lug.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (10)
1. A tab forming process of a lithium ion battery pole piece is characterized by comprising the following steps:
the length extending direction conveying of edge pole piece the pole piece, the pole piece includes the mass flow body there are coating district and utmost point ear district on the surface of mass flow body, utmost point ear district is located the length border in coating district, the coating has polarity active material on the coating district, utmost point ear district is for not coating the exposed district of mass flow body of polarity active material,
the roller of the roller device is pressed on the surface of a pole lug area of the pole piece passing under the roller by preset pressure, the surface of the roller is provided with raised grains, raised grains staggered with the raised grains of the roller are formed on the surface of the pole lug area, and the grains of the pole lug area or the extension line thereof are intersected with the boundary line between the pole lug area and the coating area;
the die cutting device cuts the pole lug area of the pole piece passing through the cutting die, a pole lug extending out of the length edge of the pole piece is formed on the pole lug area, and a plurality of pole lugs are formed on the length edge of the pole piece located at the rear end of the die cutting device.
2. The process of claim 1, wherein the step of forming the electrode tab comprises the steps of,
the two length edges of the coating area are respectively provided with the polar lug areas, and the roller devices are respectively arranged above the polar lug areas.
3. The process of claim 1, wherein the step of forming the electrode tab comprises the steps of,
the coating device is characterized in that the pole lug area is arranged on one length edge of the coating area, and the roller devices are respectively arranged above the pole lug area.
4. The process of claim 1, wherein the step of forming the electrode tab comprises the steps of,
the lines on the surface of the roller are in a net shape formed by crossed lines,
the lines on the surface of the polar ear region are in a net shape formed by crossed lines.
5. The process of claim 4, wherein the step of forming the electrode tab comprises the steps of,
the lines on the surface of the roller are in a net shape formed by intersecting lines of one group of parallel line lines and the other group of parallel line lines;
the lines on the surface of the polar ear area are in a net shape formed by intersecting lines of one group of parallel line routes and the other group of parallel line routes.
6. The process of claim 5, wherein the step of forming the electrode tab comprises the steps of,
the distances between the parallel lines of the lines are equal.
7. A lithium ion battery pole piece manufactured by the pole lug forming process of the lithium ion battery pole piece according to any one of claims 1 to 10.
8. The utility model provides a utmost point ear former of lithium ion battery pole piece, characterized by includes: a guide roll transmission mechanism, a roller device and a die cutting device,
the guide roller transmission mechanism comprises a plurality of guide rollers for conveying the pole pieces on the guide rollers along the length extension direction of the pole pieces;
the roller device is positioned at the front end of the die cutting device and comprises a roller, the roller is positioned above one guide roller, raised grains are arranged on the surface of the roller, and the grains are intersected with the conveying direction of the guide roller;
die cutting device installs gyro wheel device's rear end, die cutting device includes mould and lower mould be provided with the edge of a knife on the arbitrary opposite face of mould, lower mould, work as when mould, lower mould are closed relatively, edge of a knife cross cutting is located go up the utmost point ear district of the pole piece between mould, the lower mould, with form in the utmost point ear district and stretch out the utmost point ear at the length border of pole piece.
9. A lithium ion battery pole piece is characterized by comprising:
the surface of a coating area of the current collector is coated with a polar active material, a plurality of lugs extend out of the length edge of the coating area, the polar active material is not coated on each lug, and the current collector is exposed outside,
convex grains are formed on each electrode lug respectively, and the grains or the extension lines of the grains are intersected with the boundary line between the electrode lug area and the coating area.
10. A lithium ion battery comprising a cell, wherein the cell is formed by winding a positive plate, a negative plate, and a separator, and either or both of the positive plate and the negative plate is the plate of any one of claims 21 to 30.
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| CN202010731344.5A CN112207165A (en) | 2020-07-27 | 2020-07-27 | Lithium ion battery, pole piece and tab forming process and equipment |
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| CN202010731344.5A CN112207165A (en) | 2020-07-27 | 2020-07-27 | Lithium ion battery, pole piece and tab forming process and equipment |
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| CN202010731344.5A Pending CN112207165A (en) | 2020-07-27 | 2020-07-27 | Lithium ion battery, pole piece and tab forming process and equipment |
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| CN113451540A (en) * | 2021-08-12 | 2021-09-28 | 上海兰钧新能源科技有限公司 | Pole piece rolling method |
| CN114346048A (en) * | 2021-12-22 | 2022-04-15 | 长沙矿冶研究院有限责任公司 | Lithium sheet die cutting equipment and lithium sheet die cutting process |
| CN114535934A (en) * | 2022-02-23 | 2022-05-27 | 上海兰钧新能源科技有限公司 | Pole piece rolling method and pole piece |
| CN114914389A (en) * | 2022-03-31 | 2022-08-16 | 广东利元亨智能装备股份有限公司 | Pole piece cutting control method, system, equipment and storage medium |
| CN116533004A (en) * | 2023-07-04 | 2023-08-04 | 江苏时代新能源科技有限公司 | Cutting device, battery manufacturing production line and processing method of pole piece material belt |
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