CN111403682A - Pole piece forming process - Google Patents
Pole piece forming process Download PDFInfo
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- CN111403682A CN111403682A CN202010304137.1A CN202010304137A CN111403682A CN 111403682 A CN111403682 A CN 111403682A CN 202010304137 A CN202010304137 A CN 202010304137A CN 111403682 A CN111403682 A CN 111403682A
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- width
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- 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)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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Abstract
The invention discloses a pole piece forming process, which comprises the following process steps: (1) coating with different widths, namely coating the base material at intervals along the width direction of the base material to form a plurality of coating areas, wherein a gap between every two adjacent coating areas is a middle blank area, the two coating areas positioned at the outermost edges are narrow-width coating areas, and the coating area positioned between the two narrow-width coating areas is a wide-width coating area; (2) cutting along the central line of the wide coating area to obtain a cut substrate; (3) and die cutting, namely die cutting is carried out on the cut base material to cut off waste materials, so that two pole piece belts are obtained, each pole piece belt comprises a main body part and a pole lug, the pole lug protrudes out of the main body part from the side edge of the main body part along the width direction of the main body part, and the pole lugs of the two pole piece belts share the same middle blank area and are arranged in a staggered and meshed mode. The invention can effectively reduce leftover materials, thereby improving the utilization rate of the base material and saving the cost.
Description
Technical Field
The invention relates to a pole piece forming process.
Background
Along with the development of modern society, the import dependence of China on petroleum is more serious, and in addition, the fossil energy combustion process produces carbon emission, which causes a series of environmental problems such as greenhouse effect, haze and the like. As an important field of fossil energy consumption, automobiles have been gradually evolved into electric vehicles. The power lithium ion battery is taken as the heart of the electric new energy automobile, the energy density is improved, the manufacturing cost is reduced, and the great need is met.
In the production process of the conventional lithium battery, as shown in fig. 1-5, in the existing pole piece forming process, the process steps are as follows:
(1) coating with equal width, namely coating the base material at intervals along the width direction of the base material to form a plurality of coating areas 10, wherein the widths of the coating areas 10 are equal, a blank area left outside the coating areas 10 at the two outermost edges is a narrow blank area 20, a blank area between the two narrow blank areas 20 is a wide blank area 30, and the width of the wide blank area 30 is 2 times that of the narrow blank area 20;
(2) cutting along the center of the wide margin area 30 to obtain a pre-cut base material, wherein the middle of the pre-cut base material is a coating area 10, and the two sides of the pre-cut base material are margin areas 40;
(3) die cutting, namely cutting along a die cutting track 50 in two blank areas 40 of the pre-cut base material to obtain a plurality of tabs 52 protruding outwards along the width direction of the coating area;
(4) and (4) splitting, namely cutting along the central line of the coating area 10 of the pre-cut base material to obtain two electrode strip belts which are symmetrical to each other.
In the conventional production process, more leftover materials are generated, so that the utilization rate of the base material is low, and the production cost is high.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a pole piece forming process, which can effectively reduce leftover materials, further improve the utilization rate of a base material and save the cost.
In order to solve the technical problems, the technical scheme of the invention is as follows: a pole piece forming process comprises the following process steps:
(1) coating with different widths, namely coating the base material at intervals along the width direction of the base material to form a plurality of coating areas, wherein a gap between every two adjacent coating areas is a middle blank area, the two coating areas positioned at the outermost edges are narrow-width coating areas, and the coating area positioned between the two narrow-width coating areas is a wide-width coating area;
(2) cutting along the central line of the wide coating area to obtain a cut substrate;
(3) and die cutting, namely die cutting is carried out on the cut base material to cut off waste materials to obtain two pole piece belts, and the pole lugs of the two pole piece belts share the same middle white area and are in staggered occlusion arrangement.
Further, the method also comprises the following steps between the step (1) and the step (2):
cold pressing the coated substrate.
Further, in order to confirm whether the coating is deflected or not for correcting the coating, in the step (1), an edge margin region is left between the narrow coating region and the side edge of the substrate adjacent to the narrow coating region.
Further, the width of the narrow width coating area is wider than the main body part of the pole piece belt;
and/or the width of the wide width coating area is wider than 2 times of the width of the main body part of the pole piece belt;
and/or the width of the intermediate margin is wider than the width of the tab belt in the direction protruding from the main body portion of the tab belt.
Further, in order to reduce waste as much as possible, the width of the edge margins is < 10 mm;
and/or the difference between the width of the narrow width coating zone and the width of the main body part is less than 10 mm;
and/or the difference between the width of the broad width coating zone and 2 times the width of the main body part is < 10 mm;
and/or the difference between the width of the intermediate margin and the width of the tab in the direction protruding from the main body portion is < 10 mm.
Further, in order to remove the thinning area and ensure the coating weight to be consistent with the main body, the method also comprises the following steps between the step (2) and the step (3):
cutting is performed at a position of the narrow width coating region near the edge margin region to cut off the edge margin region.
Further, the distance between the cutting line for cutting off the edge margins in the narrow width coating zone and the corresponding edge margins is < 10 mm.
Further, the step (3) comprises:
and cutting off the interleaved die-cutting leftover materials of the tabs along the interleaved die-cutting track of the tabs in the split base material to obtain two tab belts, wherein the top points of the tabs of the two tab belts are opposite, and the tab of one tab belt is positioned in a gap between adjacent tabs of the other tab belt.
Further, in order to ensure the consistency of the staggered die-cutting tracks of the lugs in each slitting base material, the widths of the middle blank areas are equal.
After the technical scheme is adopted, the middle blank area is used for the die cutting and sharing of the pole lugs of the pole pieces corresponding to the coating areas on the two sides of the middle blank area, the die cutting process adopts a pole lug staggered occlusion cutting path, so that after the pole lugs corresponding to the coating areas on the two sides of the cut substrate are formed, the top ends of the pole lugs point oppositely, two pole piece belts are obtained after die cutting of the same cut substrate, the pole lugs of one pole piece belt are positioned in the gap of the adjacent pole lugs of the other pole piece belt, the pole lugs of the two pole piece belts are mutually staggered and arranged to share the same blank area, in the existing pole piece forming process, an independent die cutting process is adopted, the pole lugs on one side correspond to the independent blank area, the theoretical leftover material area of the pole lug staggered die cutting process under the existing die cutting process is more than 2 times of the leftover material loss of the pole lug staggered die cutting process, the invention reduces 50% of the leftover material of the substrate compared with the existing, thereby reducing the cost; the margin area is less than 10mm and is only used for coating deviation correction; the pre-cutting of the narrow coating area only cuts the edge, removes the thinning area and ensures the consistency of the coating weight of the coating area.
Drawings
FIG. 1 is a diagram of a substrate coated with a medium width by a conventional pole piece forming process;
FIG. 2 is a pre-cut substrate after slitting in the existing pole piece forming process;
FIG. 3 is a die-cut trace of a conventional pole piece forming process;
FIG. 4 is a pre-cut substrate after die cutting in the prior art pole piece forming process;
FIG. 5 shows a pole piece strip after slitting in a conventional pole piece forming process;
FIG. 6 shows a substrate coated with different widths in the pole piece forming process of the present invention;
FIG. 7 is a cut substrate after cutting in the pole piece forming process of the present invention;
fig. 8 is a cross die cutting trace of the tab in the pole piece forming process of the present invention;
FIG. 9 is a die cut pole piece strip of the pole piece forming process of the present invention;
fig. 10 is a cross die cut scrap of tab die cut in the pole piece forming process of the present invention.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 6 to 10, a pole piece forming process includes the following steps:
(1) coating with different widths, namely coating the base material at intervals along the width direction of the base material to form a plurality of coating areas, wherein a gap between every two adjacent coating areas is a middle blank area 1, the two coating areas positioned at the outermost edges are narrow-width coating areas 2, and the coating area positioned between the two narrow-width coating areas 2 is a wide-width coating area 3;
(2) slitting, namely cutting along the central line of the wide coating area 3 to obtain a slit substrate 4;
(3) and die cutting, namely die cutting is carried out on the cut base material 4 to cut off waste materials, so that two pole piece belts are obtained, and the pole lugs 52 of the two pole piece belts share the same middle blank area 1 and are in staggered occlusion arrangement.
Specifically, the pole piece tape comprises a main body part 51 and a tab 52, the rest of the coating area in the cut substrate 4 is used as the main body part 51 of the pole piece tape, the rest of the middle margin area 1 in the cut substrate 4 is used as the tab 52 of the pole piece tape, and the tab 52 protrudes from the side edge of the main body part 51 along the width direction of the main body part 51 from the main body part 51.
In the embodiment, the middle blank area 1 is used for the common die cutting of the pole lugs of the pole pieces corresponding to the coating areas on the two sides, the die cutting process adopts a pole lug staggered occlusion cutting path, so that after the pole lugs 52 corresponding to the coating areas on the two sides of the divided substrate 4 are formed, the top ends of the pole lugs 52 point oppositely, two pole piece belts are obtained after the same divided substrate 4 is die-cut, the pole lug 52 of one pole piece belt is positioned in the gap of the adjacent pole lug 52 of the other pole piece belt, the pole lugs 52 of the two pole piece belts are mutually staggered and share the same blank area, in the existing pole piece forming process, an independent die cutting process is adopted, the pole lug 52 on one side corresponds to the independent blank area, the area of the theoretical leftover material loss of the pole piece under the existing die cutting process is more than 2 times of the leftover material loss of the pole lug staggered die cutting process, the invention reduces 50% of the leftover material of the substrate compared with the existing pole piece forming process, greatly improves the, thereby reducing the cost.
In this embodiment, between step (1) and step (2), further comprising:
cold pressing the coated substrate.
As shown in fig. 6 to 10, in order to confirm whether the coating is deflected or not and to correct the coating, in step (1), an edge margin region 6 is left between the narrow width coating region 2 and the side of the substrate adjacent thereto.
As shown in fig. 6 to 10, the narrow width coating region 2 is wider than the main body portion 51 of the pole piece tape;
and/or the width of the wide width coating region 3 is wider than 2 times the width of the main body part 51 of the pole piece belt;
and/or the width of the intermediate margin 1 is wider than the width of the tab 52 in the direction protruding from the main body portion 51.
In the embodiment, the width of the edge margin area 6 is less than 10mm, the edge margin area is less than 10mm, and the edge margin area 6 is used for coating deviation correction; the difference between the width of the narrow width coating region 2 and the width of the main body portion 51 is < 10 mm; the difference between the width of the wide application region 3 and 2 times the width of the main body portion 51 is < 10 mm; the difference between the width of the intermediate margin 1 and the width of the tab 52 in the direction protruding from the main body 51 is < 10 mm.
As shown in fig. 6 and 7, in order to remove the thinning area and ensure the coating weight to be consistent with the main body, the method further comprises the following steps between the step (2) and the step (3):
cutting is performed at a position of the narrow width coated region 2 near the edge margins 6 to cut off the edge margins 6.
In the present embodiment, the distance between the cutting line for cutting off the edge margins in the narrow width coating zone 2 and the corresponding edge margins 6 is < 10 mm. The narrow coating area 2 is pre-cut to only cut the edge, so that a thinning area is removed, and the consistency of the coating weight of the coating area is ensured.
As shown in fig. 8, 9, and 10, step (3) includes:
and cutting off the tab staggered die-cutting leftover material 8 along the tab staggered die-cutting track 7 in the slitting base material 4 to obtain two pole piece belts, wherein the top ends of the tabs 52 of the two pole piece belts are opposite in direction, and the tab 52 of one pole piece belt is positioned in a gap between the adjacent tabs 52 of the other pole piece belt.
In this embodiment, the tab interdigitation die cutting track 7 comprises two tab cutting paths which engage with each other, each tab cutting path being used to form a tab 52 which is connected to a coating zone of the slit substrate 4.
As shown in fig. 6 and 7, in order to ensure the consistency of the tab staggered die cutting tracks 7 in each of the slit base materials 4, the widths of the intermediate margin regions 1 are equal.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A pole piece forming process is characterized in that,
the process steps comprise:
(1) coating with different widths, namely coating the base material at intervals along the width direction of the base material to form a plurality of coating areas, wherein a gap between every two adjacent coating areas is a middle blank area (1), the two coating areas positioned at the outermost edges are narrow-width coating areas (2), and the coating area positioned between the two narrow-width coating areas (2) is a wide-width coating area (3);
(2) slitting, namely cutting along the central line of the wide coating area (3) to obtain a slit substrate (4);
(3) and die cutting, namely die cutting is carried out on the cut base material (4) to cut off waste materials to obtain two pole piece belts, and the lugs (52) of the two pole piece belts share the same middle blank area (1) and are in staggered occlusion arrangement.
2. The pole piece molding process of claim 1,
the method also comprises the following steps between the step (1) and the step (2):
cold pressing the coated substrate.
3. The substrate forming process according to claim 1,
in step (1), an edge margin (6) is left between the narrow width coating region (2) and the side of the substrate adjacent thereto.
4. The substrate forming process according to claim 3,
the width of the narrow coating area (2) is wider than the main body part (51) of the pole piece belt;
and/or the width of the wide width coating area (3) is wider than 2 times of the width of the main body part (51) of the pole piece belt;
and/or the width of the intermediate blanking area (1) is wider than the width of the pole lug (52) of the pole piece strip in the direction protruding out of the main body part (51) of the pole piece strip.
5. The substrate forming process according to claim 4,
the width of the edge white region (6) is less than 10 mm;
and/or the difference between the width of the narrow width coating zone (2) and the width of the main body part (51) is less than 10 mm;
and/or the difference between the width of the broad width coating zone (3) and 2 times the width of the main body part (51) is < 10 mm;
and/or the difference between the width of the intermediate blanking region (1) and the width of the tab (52) in the direction protruding from the main body (51) is < 10 mm.
6. The substrate forming process according to claim 3,
the method also comprises the following steps between the step (2) and the step (3):
cutting is performed at a position of the narrow width coating area (2) close to the edge margin area (6) to cut off the edge margin area (6).
7. The substrate forming process according to claim 6,
the distance between the cutting line for cutting off the edge margins in the narrow application zone (2) and the corresponding edge margins (6) is less than 10 mm.
8. The substrate forming process according to claim 1,
the step (3) comprises:
and cutting off the tab staggered die-cutting leftover materials (8) along the tab staggered die-cutting track (7) in the slitting base material (4) to obtain two pole piece belts, wherein the top ends of the tabs (52) of the two pole piece belts are opposite in direction, and the tab (52) of one pole piece belt is positioned in a gap between the adjacent tabs (52) of the other pole piece belt.
9. The pole piece molding process of claim 1,
the width of each middle white space (1) is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010304137.1A CN111403682A (en) | 2020-04-17 | 2020-04-17 | Pole piece forming process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010304137.1A CN111403682A (en) | 2020-04-17 | 2020-04-17 | Pole piece forming process |
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| CN111403682A true CN111403682A (en) | 2020-07-10 |
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| CN202010304137.1A Pending CN111403682A (en) | 2020-04-17 | 2020-04-17 | Pole piece forming process |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112331811A (en) * | 2020-10-30 | 2021-02-05 | 蜂巢能源科技有限公司 | Pole piece processing method and equipment |
| CN112510212A (en) * | 2020-10-28 | 2021-03-16 | 天津空间电源科技有限公司 | Stress-free end face shaping battery and manufacturing process thereof |
| CN112635704A (en) * | 2020-12-28 | 2021-04-09 | 蜂巢能源科技有限公司 | Pole piece and pole piece coating method |
| CN112670435A (en) * | 2020-12-17 | 2021-04-16 | 惠州市豪鹏科技有限公司 | Preparation method of battery pole piece |
| CN114700616A (en) * | 2022-06-06 | 2022-07-05 | 苏州宇量电池有限公司 | Laser dislocation die cutting method of pole piece, pole piece and battery |
| CN114725321A (en) * | 2022-04-19 | 2022-07-08 | 苏州杰锐思智能科技股份有限公司 | Sheet making method and apparatus |
| CN114976516A (en) * | 2022-05-31 | 2022-08-30 | 无锡先导智能装备股份有限公司 | Lug forming method, device and system |
| WO2023273398A1 (en) * | 2021-06-30 | 2023-01-05 | 宁德时代新能源科技股份有限公司 | Method and device for forming electrode plate |
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| CN114976516A (en) * | 2022-05-31 | 2022-08-30 | 无锡先导智能装备股份有限公司 | Lug forming method, device and system |
| CN114700616A (en) * | 2022-06-06 | 2022-07-05 | 苏州宇量电池有限公司 | Laser dislocation die cutting method of pole piece, pole piece and battery |
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