CN116169252A - Special-shaped battery core cutting method and special-shaped battery packaging method - Google Patents
Special-shaped battery core cutting method and special-shaped battery packaging method Download PDFInfo
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- CN116169252A CN116169252A CN202211640590.5A CN202211640590A CN116169252A CN 116169252 A CN116169252 A CN 116169252A CN 202211640590 A CN202211640590 A CN 202211640590A CN 116169252 A CN116169252 A CN 116169252A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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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
- 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
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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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
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Mechanical Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a die cutting method of a special-shaped battery cell and a packaging method of the special-shaped battery cell, wherein the die cutting method comprises the following steps: and die cutting is carried out on the positive electrode plate or the negative electrode plate according to the shape of the special-shaped battery cell and the symmetrical shape rotated anticlockwise by 90 degrees. The special-shaped battery packaging method comprises the following steps: the special-shaped positive electrode cell and the special-shaped negative electrode cell are obtained by adopting the die cutting method; and sequentially laminating the special-shaped positive electrode cell and the special-shaped negative electrode cell to obtain a bare cell, and sequentially welding, packaging, baking, injecting liquid, forming, sealing twice, separating volume, OCV and detecting the bare cell to obtain the battery. The die cutting method is particularly suitable for the L-shaped special-shaped battery cell, other special-shaped battery cells can be referred to and suitable for the L-shaped special-shaped battery cell, and the pole piece material area can be greatly saved by more than 28% for the L-shaped special-shaped battery cell, so that the special-shaped battery cell is formed by encapsulation.
Description
Technical Field
The invention belongs to the technical field of cell die cutting, and particularly relates to a special-shaped cell die cutting method and a special-shaped cell packaging method.
Background
The lithium battery has higher energy density and a high-voltage platform, is favorable for forming a battery power supply group, has light weight, long service life and environment friendliness, and is widely applied to mobile equipment such as mobile phones, notebook computers, tablet computers, bluetooth headphones, cameras and the like and the field of mobile power supplies.
At present, along with the increasing market demands and various electric appliances, urgent demands are made on irregular batteries, the conventional square batteries cannot meet battery assembly demands, so that in order to match a special-shaped battery compartment, the shape, size and appearance of the batteries are greatly adjusted, such as the L-shaped batteries which are currently appeared, and a lamination technology is adopted, but the L-shaped lamination technology has complicated procedures, low production efficiency and low utilization rate of pole pieces, namely, the empty L-shaped parts cannot be used and are wasted, so that further development of a novel matching die cutting method is needed to greatly improve the utilization rate of the die cutting pole pieces of the special-shaped lamination technology as much as possible.
Disclosure of Invention
In view of the above, in order to solve the problems and defects existing in the prior art, the invention provides a die cutting method for a special-shaped battery cell and a packaging method for the special-shaped battery cell, and the die cutting method can maximally improve the utilization rate of an L-shaped pole piece material area and reduce waste.
In order to achieve the technical purpose, the technical scheme adopted by the application is as follows:
in a first aspect, the present invention provides a method for die cutting a shaped cell, comprising: and die cutting is carried out on the positive electrode plate or the negative electrode plate according to the shape of the special-shaped battery cell and the symmetrical shape rotated anticlockwise by 90 degrees.
Further, the die cutting method specifically comprises the following steps:
and 3, placing the rolled zebra-shaped transverse stripe-shaped positive electrode plate or negative electrode plate on die cutting equipment, arranging the positive electrode plate or the negative electrode plate according to the special-shaped battery core shape and the symmetrical shape of the special-shaped battery core shape through 90-degree anticlockwise rotation to form a die cutting track, and performing die cutting along the die cutting track.
Further, in the step 1, the foil structure is rectangular.
Preferably, the coating width of the AT9 ceramic slurry is 4-6 mm, and the thickness is 0.030-0.070 mm.
Further, the control parameters of the rolling in the step 2 are as follows: the rolling pressure is 10-120T, and the winding and unwinding tension is 10-120N.
Further, the special-shaped battery cell in the step 3 is of an L-shaped sheet structure, the L-shaped sheet structure is divided into an upper sheet, a middle sheet and a lower sheet according to an up-down sequence, and the upper sheet, the middle sheet and the lower sheet are integrated.
Further, the middle sheet and the lower sheet are located in the material region.
Preferably, the middle panel vertical side length is greater than the lower panel vertical side length.
Further, in the step 3, during die cutting, the bottom edges of the special-shaped battery cell shape and the symmetrical shape thereof are respectively parallel to the lower edge and the upper edge of the zebra-shaped horizontal stripe-shaped positive electrode plate or the negative electrode plate, and the side edges of the special-shaped battery cell shape and the symmetrical shape thereof are respectively parallel to the right edge and the left edge of the zebra-shaped horizontal stripe-shaped positive electrode plate or the negative electrode plate.
Further, in the step 3, the die cutting method is hardware die cutting or laser die cutting, preferably laser die cutting.
In a second aspect, the present invention provides a method for packaging a shaped battery, including:
the special-shaped positive electrode plate and the special-shaped negative electrode plate are obtained by adopting the die cutting method;
and sequentially laminating the special-shaped positive electrode plate and the special-shaped negative electrode plate to obtain a bare cell, and sequentially welding, packaging, baking, liquid injection, formation, secondary sealing, capacity division, OCV and detection the bare cell to obtain the battery.
In a third aspect, the present invention provides a shaped battery, obtained by the above packaging method.
The die cutting method is particularly suitable for the L-shaped special-shaped battery cell, other special-shaped battery cells can be referred to and suitable for the L-shaped special-shaped battery cell, and the pole piece material area can be greatly saved by more than 28% for the L-shaped special-shaped battery cell, so that the special-shaped battery cell is formed by encapsulation.
Drawings
Fig. 1 is a schematic structural diagram of a zebra-type stripe pole piece in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a special-shaped cell in embodiment 1 of the present invention, wherein 1 is an upper sheet, 2 is a middle sheet, 3 is a lower sheet.
Fig. 3 is a schematic diagram of another structure of a special-shaped cell applicable to the present invention, and reference numerals in fig. 3 are the same as those in fig. 2.
Fig. 4 is a schematic diagram of die cutting for an L-shaped cell in the prior art.
Fig. 5 is an arrangement diagram of the special-shaped cell shape and the shape of 90 ° counterclockwise rotation symmetry with the special-shaped cell shape on the rolled pole piece in embodiment 1 of the present invention.
Fig. 6 is a dimension calculation chart for the die cutting mode of fig. 4 in embodiment 1 of the present invention.
Fig. 7 is a dimension calculation chart for the die cutting mode of fig. 5 in embodiment 1 of the present invention.
Detailed Description
In the description of the present invention, it is to be noted that the specific conditions are not specified in the examples, and the description is performed under the conventional conditions or the conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The invention will now be described in further detail with reference to the drawings and to specific examples, which are given by way of illustration and not limitation.
Example 1
The embodiment provides a method for cutting a special-shaped battery cell, wherein the special-shaped battery cell is of an L-shaped structure shown in fig. 2, the L-shaped sheet structure is divided into an upper sheet 1, a middle sheet 2 and a lower sheet 3 according to an up-down sequence, and the upper sheet 1, the middle sheet 2 and the lower sheet 3 are integrated. The die cutting method specifically comprises the following steps:
1. stirring to manufacture positive electrode slurry and negative electrode slurry, coating the positive electrode slurry or the negative electrode slurry on a foil material according to a sequence rule to form a material area, coating AT9 ceramic slurry on the upper edge and the lower edge of the material area of the positive electrode foil material, wherein the negative electrode foil material does not need to be coated with the AT9 ceramic slurry, and determining the size of the material area according to the special-shaped cell shape shown in fig. 5 and the arrangement mode of the special-shaped cell shape and the shape which is 90 degrees anticlockwise rotation symmetry on a rolling electrode plate, wherein the coating width of the AT9 ceramic slurry is 5mm, and further obtaining a zebra-shaped transverse stripe-shaped positive electrode plate or a negative electrode plate (the difference between the negative electrode plate and the positive electrode plate shown in fig. 5 is no AT9 area); and the middle piece and the lower piece of the special-shaped battery cell are positioned in the material area.
In the embodiment, the positive electrode slurry is prepared from lithium cobaltate, NMP, a binder and conductive carbon black; the cathode slurry is prepared from graphite, deionized water, a binder, a stabilizer and conductive carbon black. Lithium cobaltate may also be replaced with lithium iron phosphate or ternary materials.
2. Rolling the zebra-type transverse stripe-shaped positive electrode plate or negative electrode plate, wherein the rolling pressure is 60T, and the winding and unwinding tension is 60N. Until the specified thickness of the pole piece is reached, the rolled pole piece is shown in fig. 1, in the embodiment, the rolled pole piece does not need to be split, the pole piece can directly enter a die cutting process, and the production efficiency is improved while the process is saved.
3. The rolled transverse stripe zebra stripe pole pieces are placed on die cutting equipment, die cutting tracks (shown in figure 5) are formed on the pole pieces according to the special-shaped battery core shape and the symmetrical shape of the special-shaped battery core shape through 90-degree anticlockwise rotation, and die cutting is carried out along the die cutting tracks. The die cutting mode can select hardware die cutting or laser die cutting; hardware die cutting is low in cost, but die cutting effect is poor: the burrs are large, the cutting die is easy to wear, and the application range is narrow; the laser die cutting effect is good: the burr is small, the section flatness consistency is good, the service life is long, the application range is wide, but the cost is high. The laser die cutting mode is selected in the embodiment.
Example 2
The embodiment provides a method for packaging a special-shaped battery, which comprises the following steps:
obtaining a special-shaped positive electrode cell and a special-shaped negative electrode cell by adopting the die cutting method of the embodiment 1;
and sequentially laminating the special-shaped positive electrode plate and the special-shaped negative electrode plate to obtain a bare cell, and then welding, packaging, baking, liquid injection, formation, secondary sealing, capacity division, OCV and detection to obtain the finished special-shaped battery.
Comparative example 1
The present comparative example provides a prior die-cutting method for a special-shaped battery cell, the special-shaped battery cell has the same structure as that of the embodiment 1, the die-cutting track is shown in fig. 4, and the present comparative example also belongs to a symmetrical die-cutting method, and the die-cutting method specifically comprises the following steps:
1. stirring to manufacture positive electrode slurry and negative electrode slurry, coating the positive electrode slurry or the negative electrode slurry on a foil material according to a sequence rule to form a material area, coating AT9 ceramic slurry on the upper edge and the lower edge of the material area, and determining the size of the material area according to the special-shaped cell shape shown in fig. 4 and the arrangement mode of the special-shaped cell shape on a rolled pole piece in a horizontally symmetrical shape, wherein the coating width of the AT9 ceramic slurry is 5mm, and further preparing a zebra-shaped horizontal stripe-shaped positive electrode piece or a zebra-shaped negative electrode piece; the positive electrode slurry and the negative electrode slurry were the same as in example 1.
2. Rolling the zebra-type transverse stripe-shaped positive electrode plate or negative electrode plate, wherein the rolling pressure is 60T, and the winding and unwinding tension is 60N. Until the specified thickness of the pole piece is reached, in the comparative example, the pole piece after rolling is subjected to slitting, and then the pole piece enters a die cutting procedure.
3. And placing the rolled zebra-shaped transverse stripe-shaped positive electrode plate or negative electrode plate on die cutting equipment, arranging the positive electrode plate or the negative electrode plate on the electrode plate according to the special-shaped cell shape shown in fig. 4 and the shape which is horizontally symmetrical to the special-shaped cell shape to form a die cutting track (shown in fig. 4), and performing die cutting along the die cutting track. Also, a laser die cutting mode is adopted.
The die cutting mode of comparative example 1 cannot utilize the pole piece at the L-shaped position, so that great waste is caused, and when A is larger than B, the pole piece can be maximally utilized and the waste is reduced when the die cutting is performed according to the die cutting track of example 1, as in the special-shaped cell structure of FIG. 2. Because of the different die cutting tracks, the sizes of the material areas (black parts) in fig. 4 and 5 are different, but the sizes of the die cutting pole pieces (special-shaped battery cells) are the same (gray dotted line areas), the size of the material area (black part) in fig. 5 is obviously smaller than that of the material area (black part) in fig. 4, and the die cutting mode is not limited to the shape in fig. 4, other similar die cutting shapes can be realized, for example, the L-shaped battery cell with the structure shown in fig. 3 is also applicable to the die cutting method of the invention.
Further, the pole piece materials saved for the die cutting methods of example 1 and comparative example 1 were specifically calculated as follows:
because the material area is coated with slurry, the cost is high, and the material area of the pole piece is mainly saved, as shown in fig. 6, namely, the die cutting mode of comparative example 1, which is shown as a schematic diagram of two die-cut pieces, I is the material area width, namely, the black material area width mentioned above, J is the empty foil width, namely, the foil area mentioned above, i+j+j is the width of the whole pole piece, b, c and d are gaps, namely, unavailable areas, k and l are unavailable areas, f, g, h, R is the die-cut piece size, b, c, d, k, l area is the lost area, b=c=d=5 mm, g=9 mm, r=5.75 mm, h=72.53 mm, f=73.13 mm, i=151.26 mm, j=17 mm, n=77.53 mm, l1=k1=47.18 mm, l2=k2=38.06 mm, the loss rate=loss area/pole piece area×100%, and the loss rate= 41.40% is calculated; the die cutting mode of example 1 is shown in fig. 7, which is a schematic diagram of two die-cut sheets, I ' is the width of the material region, i.e. the width of the black material region, J ' is the width of the blank foil, I ' +j ' is the width of the whole sheet, a ', b ', c ', d ', e ' are gaps, i.e. unavailable regions, f, g, h, R is the size of the die-cut sheet, a ' =1 mm, b ' =c ' =d ' =e ' =5 mm, g=9 mm, r=5.75 mm, h=72.53 mm, f=73.13 mm, I ' =75.13 mm, J ' =17 mm, n ' = 107.88mm, loss rate=loss region/sheet material region×100%, and loss rate=12.84% is calculated; it can be seen that the die cutting of fig. 7 saves 28.56% of the pole piece material area over the die cutting of fig. 6.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A special-shaped cell die cutting method is characterized in that: comprising the following steps: and die cutting is carried out on the positive electrode plate or the negative electrode plate according to the shape of the special-shaped battery cell and the symmetrical shape rotated anticlockwise by 90 degrees.
2. A method of die cutting a shaped cell according to claim 1, wherein: the die cutting method specifically comprises the following steps:
step 1, respectively coating positive electrode slurry or negative electrode slurry on a foil material according to a sequence rule to form a material area, and coating AT9 ceramic slurry on the upper edge and the lower edge of the material area of the positive electrode plate to obtain a zebra-shaped transverse stripe-shaped positive electrode plate or negative electrode plate;
step 2, rolling the zebra-shaped transverse stripe-shaped positive electrode plate or the negative electrode plate until the thickness reaches the specified thickness;
and 3, placing the rolled zebra-shaped transverse stripe-shaped positive electrode plate or negative electrode plate on die cutting equipment, arranging the positive electrode plate or the negative electrode plate according to the special-shaped battery core shape and the symmetrical shape of the special-shaped battery core shape through 90-degree anticlockwise rotation to form a die cutting track, and performing die cutting along the die cutting track.
3. A method of die cutting a shaped cell according to claim 2, wherein: the foil structure in the step 1 is rectangular.
4. A method of die cutting a shaped cell according to claim 2, wherein: the coating width of the AT9 ceramic slurry is 4-6 mm, and the thickness is 0.030-0.070 mm.
5. A method of die cutting a shaped cell according to claim 2, wherein: the rolling control parameters in the step 2 are as follows: the rolling pressure is 10-120T, and the winding and unwinding tension is 10-120N.
6. A method of die cutting a shaped cell according to claim 2, wherein: the special-shaped battery cell in the step 3 is of an L-shaped sheet structure, the L-shaped sheet structure is divided into an upper sheet, a middle sheet and a lower sheet according to an up-down sequence, and the upper sheet, the middle sheet and the lower sheet are integrated.
7. The method of die cutting a shaped cell of claim 6, wherein: the middle piece and the lower piece are positioned in the material area.
8. The method of die cutting a shaped cell of claim 7, wherein: in the step 3, during die cutting, the bottom edges of the special-shaped battery cell shape and the symmetrical shape thereof are respectively parallel to the lower edge and the upper edge of the zebra-shaped horizontal stripe-shaped positive electrode plate or the negative electrode plate, and the side edges of the special-shaped battery cell shape and the symmetrical shape thereof are respectively parallel to the right edge and the left edge of the zebra-shaped horizontal stripe-shaped positive electrode plate or the negative electrode plate.
9. A special-shaped battery packaging method is characterized in that: comprising the following steps:
obtaining a special-shaped positive electrode plate and a special-shaped negative electrode plate by adopting the die cutting method as claimed in any one of claims 1 to 8;
and sequentially laminating the special-shaped positive electrode plate and the special-shaped negative electrode plate to obtain a bare cell, and sequentially welding, packaging, baking, liquid injection, formation, secondary sealing, capacity division, OCV and detection the bare cell to obtain the battery.
10. A special-shaped battery, characterized in that: is obtained by the encapsulation method of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211640590.5A CN116169252A (en) | 2022-12-20 | 2022-12-20 | Special-shaped battery core cutting method and special-shaped battery packaging method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211640590.5A CN116169252A (en) | 2022-12-20 | 2022-12-20 | Special-shaped battery core cutting method and special-shaped battery packaging method |
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| Publication Number | Publication Date |
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| CN116169252A true CN116169252A (en) | 2023-05-26 |
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| CN202211640590.5A Pending CN116169252A (en) | 2022-12-20 | 2022-12-20 | Special-shaped battery core cutting method and special-shaped battery packaging method |
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- 2022-12-20 CN CN202211640590.5A patent/CN116169252A/en active Pending
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