CN113488727B - Arc-shaped battery processing method and device and arc-shaped battery - Google Patents
Arc-shaped battery processing method and device and arc-shaped battery Download PDFInfo
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- CN113488727B CN113488727B CN202110700597.0A CN202110700597A CN113488727B CN 113488727 B CN113488727 B CN 113488727B CN 202110700597 A CN202110700597 A CN 202110700597A CN 113488727 B CN113488727 B CN 113488727B
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- 238000003672 processing method Methods 0.000 title claims abstract description 10
- 239000002985 plastic film Substances 0.000 claims abstract description 164
- 229920006255 plastic film Polymers 0.000 claims abstract description 164
- 238000003825 pressing Methods 0.000 claims abstract description 130
- 238000005452 bending Methods 0.000 claims abstract description 47
- 238000007731 hot pressing Methods 0.000 claims abstract description 11
- 238000004806 packaging method and process Methods 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 96
- 229910052782 aluminium Inorganic materials 0.000 claims description 96
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 13
- 230000000052 comparative effect Effects 0.000 description 18
- 210000004027 cell Anatomy 0.000 description 14
- 230000037303 wrinkles Effects 0.000 description 12
- 230000006870 function Effects 0.000 description 9
- 238000007493 shaping process Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
- H01M10/0481—Compression means other than compression means for stacks of electrodes and separators
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a processing method and a processing device of an arc-shaped battery and the arc-shaped battery, wherein the method comprises the following steps: before packaging the battery, adjusting the length of the aluminum-plastic film on the first surface of the battery to be larger than that of the aluminum-plastic film on the second surface of the battery, and reserving the aluminum-plastic film at the tail position of the second surface after packaging; horizontally placing the packaged battery on a second pressure piece group and a third pressure piece group; and hot-pressing the first surface by the first pressing member, and hot-pressing the second surface by the second pressing member group and the third pressing member group to obtain the arc-shaped battery with the opening bent in the same direction. According to the invention, the length of the aluminum-plastic film on the second surface is adjusted to be larger than that of the aluminum-plastic film on the first surface, so that the aluminum-plastic film is left at the tail part of the second surface of the packaged battery, and the reserved aluminum-plastic film is stretched when the second surface is stretched through the arrangement, so that the second surface is prevented from wrinkling; and secondly, auxiliary bending is performed by using a processing device, so that stress of each part is balanced when the battery is bent, and the manufactured battery is uniform.
Description
Technical Field
The invention belongs to the technical field of secondary battery manufacturing, and particularly relates to an arc-shaped battery processing method and device and an arc-shaped battery.
Background
The lithium ion soft package battery has the advantages of high voltage, high energy density, small self-discharge, no memory effect, wide working range and the like, thereby being widely applied to daily life of people.
With the advance of time, the battery gradually develops towards the direction of bendable deformation, as shown in fig. 1, the lengths of the first surface/the second surface of the aluminum plastic film of the battery are consistent before bending, the first surface of the aluminum plastic film of the battery bends inwards in the bending process, the second surface of the aluminum plastic film stretches outwards, so that the inward bending surface of the battery folds in the bending process, and the appearance and the size of the battery are seriously affected.
Disclosure of Invention
One of the objectives of the present invention is to provide a method for processing an arc-shaped battery, which is to adjust the lengths of aluminum-plastic films on a first surface and a second surface of the battery, wherein the length of the aluminum-plastic film on the second surface needs to be greater than that of the aluminum-plastic film on the first surface; the invention also aims to provide a processing device of the arc-shaped battery, which utilizes the processing device to carry out auxiliary bending so as to eliminate the wrinkle problem of the battery in the bending process; it is a further object of the present invention to provide an arc-shaped battery that can be applied to most situations.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a processing method of an arc-shaped battery, which comprises the following steps:
s1, before packaging a battery, adjusting the length of an aluminum-plastic film on a second surface of the battery to be larger than that of the aluminum-plastic film on a first surface of the battery, and reserving the aluminum-plastic film at the tail position of the second surface after packaging;
s2, horizontally placing the packaged battery on a second pressure set and a third pressure set;
and S3, carrying out hot pressing on the first surface by the first pressing piece, and carrying out hot pressing on the second surface by the second pressing piece group and the third pressing piece group to obtain the arc-shaped battery with the one-way opening bent.
And for the first surface, the first pressing piece, the second pressing piece group and the third pressing piece group apply pressure on the first surface, the battery is in a tight state, the first surface does not wrinkle, for the second surface, the arc length of the second surface is longer under the condition that the second surface and the first surface are bent by the same radian, the reserved aluminum-plastic film is stretched, and the first surface and the second surface are in a flat state after the battery is bent.
Specifically, in S1, the greater the degree of curvature of the battery, the greater the length of the aluminum plastic film of the second surface. Since the greater the bending degree is, the greater the length of the aluminum plastic film to be stretched is, and in order to ensure that the surface of the manufactured arc-shaped battery is smooth, when the bending degree of the battery becomes greater, the length of the aluminum plastic film on the second surface is also increased, so that the aluminum plastic film on the second surface can provide a sufficient stretching length in the bending process.
Specifically, the second pressure member group and the third pressure member group are rolled when the second surface is hot-pressed. Because the second pressing piece group and the third pressing piece group need to carry out hot pressing on the second surface, the lengths of all parts of the aluminum-plastic film are stretched in the stretching process of the aluminum-plastic film, and because the second pressing piece group and the third pressing piece group are contacted with the second surface to generate friction force, the second pressing piece group and the third pressing piece group are rolled, the stretching consistency of all parts of the aluminum-plastic film is ensured, and the battery is prevented from wrinkling.
Specifically, in S3, the first presser moves downward, and the second presser group and the third presser group move leftward and rightward at the same speed, respectively, so that the first surface and the second surface are curved in the same direction. The moving speed of the second pressing piece group and the third pressing piece group is consistent with the downward moving speed of the first pressing piece group, the moving speed and the rolling speed are consistent with the downward moving speed, the surface of the battery can be ensured to be flat, and meanwhile, the second pressing piece group and the third pressing piece group respectively move leftwards and rightwards at the same speed, the battery can be ensured to be bent towards one surface without forming a plurality of bends.
Specifically, in S3, the first pressing member fixing position, the second pressing member set and the third pressing member set move upward in the vertical direction, and move leftward and rightward at the same speed in the horizontal direction, respectively, so that the first surface and the second surface are bent in the same direction.
Specifically, the bending radian of the battery is 0-180 degrees. The battery can be bent by 0-180 degrees, so that the application range of the arc-shaped battery is increased.
The invention also discloses a processing device of the arc-shaped battery, which comprises: the first pressing piece, the second pressing piece group and the third pressing piece group; the second pressing piece group and the third pressing piece group are positioned on the same horizontal line and are used for carrying out hot pressing on the second surface of the battery; the first pressing piece is positioned above the midpoint between the second pressing piece group and the third pressing piece group and used for carrying out hot pressing on the first surface of the battery, wherein the second pressing piece group comprises n second pressing pieces, the third pressing piece group comprises n third pressing pieces, and n is larger than or equal to 1. The first compression element and the second compression element set and the third compression element set form a triangular structure.
Specifically, the action surfaces of the first pressing member, the second pressing member set and the third pressing member set on the battery are circular surfaces. The action surfaces of the first pressing piece group, the second pressing piece group and the third pressing piece group on the battery are round surfaces, so that the battery can be well bent, the round surfaces cannot damage the surface of the battery when the battery is bent, friction between the round surfaces and the battery is reduced, and the action surface is a surface for applying pressure to the battery.
Specifically, the n second pressing members and the n third pressing members are located on the same horizontal line. The number of the second pressing piece and the third pressing piece can be selected according to the length of the battery, when the length of the battery is increased, the number of the second pressing piece and the third pressing piece can be increased, multi-point support of the battery is achieved, and therefore the problem that the battery is bent due to the fact that supporting points are few due to the fact that the length of the battery is too large can be avoided.
The invention also discloses an arc-shaped battery, which is prepared by any one of the processing methods. Because the arc-shaped battery is wide in bending arc range, the arc-shaped battery can be suitable for various different conditions.
Compared with the prior art, the invention at least comprises the following beneficial effects:
compared with the prior art, the length of the aluminum-plastic film on the second surface is adjusted to be larger than that of the aluminum-plastic film on the first surface before packaging, so that the aluminum-plastic film is left at the tail part of the second surface of the packaged battery, and the reserved aluminum-plastic film is stretched when the second surface is stretched through the arrangement, so that the second surface is prevented from wrinkling; and secondly, auxiliary bending is performed by using a processing device, so that stress of each part is balanced when the battery is bent, and the manufactured battery is uniform.
Drawings
FIG. 1 is a schematic view of a prior art battery bending;
FIG. 2 is a schematic flow chart of a method for manufacturing an arc-shaped battery according to the present invention;
FIG. 3 is a schematic view showing the bending of the batteries of examples 1 to 6 and 13 to 24 according to the present invention;
FIG. 4 is a schematic view showing the bending of the battery according to examples 7 to 12 of the present invention;
in the figure: 1-a battery; 2-a processing device; 11-a first side; 12-a second face; 21-a first compression element; 22-a second compression element; 23-third pressing piece.
Detailed Description
The present invention will be further described in the following description with reference to the drawings for the purpose of facilitating understanding thereof, but the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein or otherwise set forth herein.
Example 1
1) The second side 12 of the cell 1 is increased in length by 2% in comparison with the first side 11 of the aluminum-plastic film in the manufacturing process of the cell 1.
2) The battery 1 is shaped by the processing device 2, the first pressing piece 21 and the second pressing piece group comprise n second pressing pieces 22, the third pressing piece group comprises n third pressing pieces 23, a second pressing piece and a third pressing piece are used in the embodiment, the first pressing piece 21 has a vertical moving function, the second pressing piece 22 and the third pressing piece 23 have vertical and horizontal moving and rolling functions, and the first pressing piece 21, the second pressing piece 22 and the third pressing piece 23 have automatic heating functions at the same time.
3) During the bending process of the battery 1, as shown in fig. 2, the first pressing piece 21 moves downwards to contact the first surface 11 of the battery 1, the battery 1 is deformed and bent, the second pressing piece 22 and the third pressing piece 23 simultaneously apply pressure to the second surface 12 of the battery 1, and during the shaping process, as the first pressing piece 21 moves downwards, the second pressing piece 22 and the third pressing piece 23 move towards two sides and continuously apply pressure to the battery 1 until the bending radian of the battery 1 reaches 20 °.
4) For the first surface 11 of the battery 1, the first surface 11 of the battery 1 is in a tightened state under the pressure exerted by the first pressing piece 21, the second pressing piece 22 and the third pressing piece 23, no wrinkle occurs on the first surface 11, for the second surface 12 of the battery 1, the arc length of the second surface 12 is longer under the condition that the second surface is bent by the same radian as the first surface 11, the reserved 2% of the aluminum plastic film is stretched, the battery 1 is shaped to obtain an arc-shaped battery with the bending radian of 20 degrees, and the first surface 11 and the second surface 12 of the arc-shaped battery are in a flat state.
Example 2
Different from the embodiment 1, in this embodiment, the length ratio of the second surface 12 aluminum plastic film of the battery 1 is increased by 5% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a curvature of 50 °, the length ratio of the reserved second surface 12 aluminum plastic film of the battery 1 is increased by 5% compared with the first surface 11 aluminum plastic film of the battery, the battery 1 is stretched, the curvature of the battery is 50 °, and the first surface 11 and the second surface 12 of the arc battery are both in a flat state.
Example 3
Different from embodiment 1, in this embodiment, the length ratio of the second surface 12 aluminum-plastic film of the battery 1 is increased by 8% compared with the first surface 11 aluminum-plastic film, the battery 1 is shaped into an arc battery with a curvature of 80 °, the length ratio of the reserved second surface 12 aluminum-plastic film increased by 8% compared with the first surface 11 aluminum-plastic film is stretched, the battery 1 is shaped to obtain an arc battery with a curvature of 80 °, and both the first surface 11 and the second surface 12 of the arc battery are in a flat state.
Example 4
Different from the embodiment 1, in this embodiment, the length ratio of the second surface 12 aluminum-plastic film of the battery 1 is increased by 13% compared with the first surface 11 aluminum-plastic film, the battery 1 is shaped into an arc battery with a curvature of 120 °, the length ratio of the reserved second surface 12 aluminum-plastic film increased by 13% compared with the first surface 11 aluminum-plastic film is stretched, the battery 1 is shaped to obtain an arc battery with a curvature of 120 °, and both the first surface 11 and the second surface 12 of the arc battery are in a flat state.
Example 5
Different from the embodiment 1, in this embodiment, the length ratio of the second surface 12 aluminum plastic film of the battery 1 is increased by 16% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a curvature of 150 °, the length ratio of the reserved second surface 12 aluminum plastic film of the battery 1 is increased by 16% compared with the first surface 11 aluminum plastic film, the aluminum plastic film is stretched, the battery 1 is shaped to obtain an arc battery with a curvature of 150 °, and the first surface 11 and the second surface 12 of the arc battery are both in a flat state.
Example 6
Different from embodiment 1, in this embodiment, the length ratio of the second surface 12 aluminum plastic film of the battery 1 is increased by 19% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a bending radian of 180 °, the reserved second surface 12 aluminum plastic film is stretched by increasing the length ratio of the aluminum plastic film of 19% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped to obtain an arc battery with a bending radian of 180 °, and both the first surface 11 and the second surface 12 of the arc battery are in a flat state.
Example 7
1) The second side 12 of the cell 1 is increased in length by 2% in comparison with the first side 11 of the aluminum-plastic film in the manufacturing process of the cell 1.
2) Three pressing pieces of the processing device 2 are adopted for shaping, wherein the first pressing piece 21 has a vertical moving function, the second pressing piece 22 and the third pressing piece 23 have vertical, horizontal and rolling functions, and the first pressing piece 21, the second pressing piece 22 and the third pressing piece 23 simultaneously have an automatic heating function.
3) In the bending process of the battery 1, as shown in fig. 3, the first pressing member 21 is kept still, the second pressing member 22 and the third pressing member 23 move upward and toward the left and right of the battery 1, and in the shaping process, as the second pressing member 22 and the third pressing member 23 move upward, the battery 1 contacts the first pressing member 21, the first pressing member 21 applies pressure to the battery 1, and simultaneously the second pressing member 22 and the third pressing member 23 move to both sides and continuously apply pressure to the battery 1 until the curvature of the battery 1 reaches 20 °.
4) For the first surface 11 of the battery 1, the first surface 11 of the battery 1 is in a tightened state under the pressure exerted by the first pressing piece 21, the second pressing piece 22 and the third pressing piece 23, no wrinkle occurs on the first surface 11, for the second surface 12 of the battery 1, the arc length of the second surface 12 is longer under the condition of the same bending radian as that of the first surface 11, the previously reserved aluminum plastic film of the second surface 12 is stretched compared with the aluminum plastic film of the first surface 11 by increasing the length ratio of the aluminum plastic film to 2%, the battery 1 is shaped to obtain an arc-shaped battery with the bending radian of 20 degrees, and the first surface 11 and the second surface 12 of the arc-shaped battery are in a flat state.
Example 8
Different from embodiment 2, in this embodiment, the length ratio of the second surface 12 aluminum plastic film of the battery 1 is increased by 5% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a curvature of 50 °, the length ratio of the reserved second surface 12 aluminum plastic film of the battery 1 is increased by 5% compared with the first surface 11 aluminum plastic film, the aluminum plastic film is stretched, the battery 1 is shaped to obtain an arc battery with a curvature of 50 °, and the first surface 11 and the second surface 12 of the arc battery are both in a flat state.
Example 9
Different from embodiment 2, in this embodiment, the length ratio of the second surface 12 aluminum plastic film of the battery 1 is increased by 8% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a curvature of 80 °, the length ratio of the reserved second surface 12 aluminum plastic film of the battery 1 is increased by 8% compared with the first surface 11 aluminum plastic film, the aluminum plastic film is stretched, the battery 1 is shaped to obtain an arc battery with a curvature of 80 °, and the first surface 11 and the second surface 12 of the arc battery are both in a flat state.
Example 10
Different from embodiment 2, in this embodiment, the length ratio of the second surface 12 aluminum plastic film of the battery 1 is increased by 13% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a curvature of 120 °, the length ratio of the reserved second surface 12 aluminum plastic film of the battery 1 is increased by 13% compared with the first surface 11 aluminum plastic film, the aluminum plastic film is stretched, the battery 1 is shaped to obtain an arc battery with a curvature of 120 °, and the first surface 11 and the second surface 12 of the arc battery are both in a flat state.
Example 11
Different from embodiment 2, in this embodiment, the length ratio of the second surface 12 aluminum plastic film of the battery 1 is increased by 16% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a curvature of 150 °, the length ratio of the reserved second surface 12 aluminum plastic film of the battery 1 is increased by 16% compared with the first surface 11 aluminum plastic film, the aluminum plastic film is stretched, the battery 1 is shaped to obtain an arc battery with a curvature of 150 °, and the first surface 11 and the second surface 12 of the arc battery are both in a flat state.
Example 12
Different from embodiment 2, in this embodiment, the length ratio of the second surface 12 aluminum plastic film of the battery 1 is increased by 19% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a bending radian of 180 °, the reserved second surface 12 aluminum plastic film is stretched by increasing the length ratio of the aluminum plastic film of 19% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped to obtain an arc battery with a bending radian of 180 °, and both the first surface 11 and the second surface 12 of the arc battery are in a flat state.
Example 13
Different from the comparative example 1, in this embodiment, the length proportion of the second surface 12 aluminum plastic film of the battery 1 is increased by 1% compared with that of the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a curvature of 20 °, the length proportion of the reserved second surface 12 aluminum plastic film increased by 1% compared with that of the first surface 11 aluminum plastic film is increased by 1% to obtain stretching, the battery 1 is shaped to obtain an arc battery with a curvature of 20 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled.
Example 14
Different from embodiment 1, in this embodiment, the length proportion of the second surface 12 aluminum-plastic film of the battery 1 is increased by 4% compared with that of the first surface 11 aluminum-plastic film, the battery 1 is shaped into an arc battery with a curvature of 50 °, the length proportion of the reserved second surface 12 aluminum-plastic film increased by 4% compared with that of the first surface 11 aluminum-plastic film is increased to obtain stretching, the battery 1 is shaped to obtain an arc battery with a curvature of 50 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled.
Example 15
Different from the embodiment 1, in the embodiment, the length proportion of the aluminum-plastic film added on the second surface 12 of the battery 1 is 7% higher than that of the aluminum-plastic film added on the first surface 11, the battery 1 is shaped into an arc battery with a curvature of 80 °, the length proportion of the aluminum-plastic film added on the reserved second surface 12 is 7% higher than that of the aluminum-plastic film added on the first surface 11, the aluminum-plastic film is stretched, the battery 1 is shaped to obtain the arc battery with a curvature of 80 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled.
Example 16
Different from the embodiment 1, in the embodiment, the length proportion of the aluminum-plastic film added on the second surface 12 of the battery 1 is 12% as compared with the length proportion of the aluminum-plastic film added on the first surface 11, the battery 1 is shaped into an arc battery with a bending radian of 120 °, the aluminum-plastic film added on the reserved second surface 12 of the aluminum-plastic film with the length proportion of 12% as compared with the aluminum-plastic film added on the first surface 11 is stretched, the battery 1 is shaped to obtain the arc battery with the bending radian of 120 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled.
Example 17
Different from the embodiment 1, in the embodiment, the length proportion of the aluminum-plastic film added on the second surface 12 of the battery 1 is 15% than that of the aluminum-plastic film added on the first surface 11, the battery 1 is shaped into an arc battery with a bending radian of 150 °, the aluminum-plastic film added on the reserved second surface 12 of the aluminum-plastic film is stretched compared with the aluminum-plastic film added on the first surface 11, the battery 1 is shaped to obtain the arc battery with the bending radian of 150 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled.
Example 18
Different from embodiment 1, in this embodiment, the length proportion of the second surface 12 aluminum-plastic film of the battery 1 is increased by 18% compared with that of the first surface 11 aluminum-plastic film, the battery 1 is shaped into an arc battery with a bending radian of 180 °, the length proportion of the reserved second surface 12 aluminum-plastic film of the battery 1 is increased by 18% compared with that of the first surface 11 aluminum-plastic film, and the aluminum-plastic film is stretched, the battery 1 is shaped to obtain an arc battery with a bending radian of 180 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled.
Example 19
Different from the embodiment 1, in the embodiment, the length proportion of the aluminum plastic film added on the second surface 12 of the battery 1 is 3% as compared with that of the aluminum plastic film added on the first surface 11, the battery 1 is shaped into an arc battery with a curvature of 20 °, the length proportion of the aluminum plastic film added on the reserved second surface 12 of the battery 1 is 3% as compared with that of the aluminum plastic film added on the first surface 11 of the battery, the battery 1 is shaped to obtain the arc battery with a curvature of 20 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled due to the fact that the reserved aluminum plastic film is longer and not completely stretched.
Example 20
Different from embodiment 1, in this embodiment, the length ratio of the second surface 12 aluminum plastic film of the battery 1 is increased by 6% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a curvature of 50 °, the length ratio of the reserved second surface 12 aluminum plastic film of the battery 1 is increased by 6% compared with the first surface 11 aluminum plastic film of the battery to be stretched, the battery 1 is shaped to obtain an arc battery with a curvature of 50 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled due to the fact that the reserved aluminum plastic film is longer and not fully stretched.
Example 21
The difference from embodiment 1 is that in this embodiment, the length proportion of the second surface 12 aluminum-plastic film of the battery 1 is increased by 9% compared with the first surface 11 aluminum-plastic film, the battery 1 is shaped into an arc battery with a curvature of 80 °, the length proportion of the reserved second surface 12 aluminum-plastic film is increased by 9% compared with the first surface 11 aluminum-plastic film, and the aluminum-plastic film is stretched, the battery 1 is shaped to obtain an arc battery with a curvature of 80 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled due to the reserved aluminum-plastic film being longer and not fully stretched.
Example 22
Different from the embodiment 1, in the embodiment, the length proportion of the aluminum plastic film added on the second surface 12 of the battery 1 is 14% as compared with that of the aluminum plastic film added on the first surface 11, the battery 1 is shaped into an arc battery with the bending radian of 120 °, the aluminum plastic film added on the reserved second surface 12 of the aluminum plastic film with the length proportion of 14% as compared with that of the aluminum plastic film added on the first surface 11 is stretched, the battery 1 is shaped to obtain the arc battery with the bending radian of 120 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled due to the fact that the reserved aluminum plastic film is longer and is not stretched completely.
Example 23
Different from the embodiment 1, in this embodiment, the length ratio of the second surface 12 aluminum plastic film of the battery 1 is increased by 17% compared with the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a curvature of 150 °, the length ratio of the reserved second surface 12 aluminum plastic film is increased by 17% compared with the first surface 11 aluminum plastic film, and the aluminum plastic film is stretched, the battery 1 is shaped to obtain an arc battery with a curvature of 150 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled due to the fact that the reserved aluminum plastic film is longer and not fully stretched.
Example 24
Different from embodiment 1, in this embodiment, the length proportion of the second surface 12 aluminum plastic film of the battery 1 is increased by 20% compared with that of the first surface 11 aluminum plastic film, the battery 1 is shaped into an arc battery with a bending radian of 180 °, the length proportion of the reserved second surface 12 aluminum plastic film of the battery 1 is increased by 20% compared with that of the first surface 11 aluminum plastic film, and the aluminum plastic film is stretched, the battery 1 is shaped to obtain the arc battery with a bending radian of 180 °, the first surface 11 of the arc battery is in a flat state, and the second surface 12 is wrinkled due to the fact that the reserved aluminum plastic film is longer and is not stretched completely.
Comparative example 1
1) The second side 12 of the battery 1 and the first side 11 of the battery 1 are made of aluminum plastic films with the same length in the manufacturing process.
2) Three pressing pieces of the processing device 2 are adopted for shaping, wherein the first pressing piece 21 has a vertical moving function, the second pressing piece 22 and the third pressing piece 23 have vertical, horizontal and rolling functions, and the first pressing piece 21, the second pressing piece 22 and the third pressing piece 23 simultaneously have an automatic heating function.
3) In the bending process of the battery 1, the first pressing piece 21 moves downwards to contact the first surface 11 of the battery 1, the battery 1 deforms and bends, the second pressing piece 22 and the third pressing piece 23 apply pressure to the second surface 12 of the battery 1 at the same time, and in the shaping process, along with the downward movement of the first pressing piece 21, the second pressing piece 22 and the third pressing piece 23 move towards two sides and continuously apply pressure to the battery 1 until the bending radian of the battery 1 reaches 20 degrees, so that the arc-shaped battery with the bending radian of 20 degrees is obtained.
4) The second side 12 of the arc cell is stretched, creating a large number of wrinkles.
Comparative example 2
Unlike comparative example 1, in which the battery 1 was shaped into an arc-shaped battery having an arc of 50 °, the second face 12 of the arc-shaped battery was greatly wrinkled.
Comparative example 3
Unlike comparative example 1, when the battery 1 was shaped into an arc-shaped battery having an arc of 80 °, a large number of wrinkles and cracks occurred on the second surface 12 of the arc-shaped battery.
Comparative example 4
Unlike comparative example 1, when cell 1 was shaped into an arc cell having a curvature of 120 °, second face 12 of the arc cell was largely cracked.
Comparative example 5
Unlike comparative example 1, the second face 12 of the arc-shaped battery was broken by shaping the battery 1 into an arc-shaped battery having an arc of 150 °.
Comparative example 6
Unlike comparative example 1, the second face 12 of the arc-shaped cell was broken by shaping the cell 1 into an arc-shaped cell having an arc of bending of 180 °.
Examples 1 to 6 show that the larger the curvature of the arc-shaped battery, the larger the ratio of the length of the aluminum plastic film on the second surface 12 to the length of the aluminum plastic film on the first surface 11, and examples 1 to 6 are different from examples 7 to 12 in terms of the curvature of the battery, and when arc-shaped batteries having the same curvature are obtained, the lengths of the aluminum plastic films on the second surface 12 when stretched are the same, and it is found that the same effects can be obtained by two different curvature modes, and the ratio of the length of the aluminum plastic film on the second surface 12 to the length of the aluminum plastic film on the first surface 11 is related to the curvature, and the correspondence is shown in table 1.
Comparing examples 1 to 6 with examples 13 to 18, it can be seen that the length of the second side 12 aluminum plastic film reserved in examples 1 to 6 is longer than that of the second side 12 aluminum plastic film reserved in comparative examples 1 to 6 under the same bending radian, and the second side 12 of the obtained arc-shaped battery is wrinkled due to insufficient length of the second side 12 aluminum plastic film reserved in comparative examples 1 to 6 being stretched during the bending process.
Comparing examples 1 to 6 with examples 19 to 24, it can be seen that the length of the second side 12 aluminum plastic film reserved for comparative examples 7 to 12 is longer than that of the second side 12 aluminum plastic film reserved for examples 1 to 6 under the same bending radian, and during the bending process, the second side 12 aluminum plastic film reserved for comparative examples 7 to 12 is stretched and can completely cope with the stress generated by stretching, but the second side 12 aluminum plastic film still generates residue after stretching, and the residue can cause the second side 12 to have wrinkles.
The comparison of examples 1 to 24 with comparative examples 1 to 6 revealed that none of the arc-shaped cell surfaces of examples 1 to 12 had wrinkles, the arc-shaped cell surfaces of examples 13 to 24 had slight wrinkles, and comparative examples 1 to 2 had a large amount of wrinkles, in which the second face 12 of the arc-shaped cell of examples 3 to 6 had broken.
In summary, the different bending radians correspond to the lengths of the aluminum-plastic films reserved on the second surfaces 12, and the overlong or overlong lengths of the aluminum-plastic films reserved on the second surfaces 12 affect the flatness of the surface of the arc-shaped battery, so that the generation of wrinkles can be effectively reduced by increasing the lengths of the second surfaces 12 of the battery compared with the lengths of the first surfaces 11 of the aluminum-plastic films, and the wrinkles can be completely eliminated when the length ratio of the second surfaces 12 of the battery increased by the aluminum-plastic films compared with the first surfaces 11 of the battery is corresponding to the bending radians of the battery.
TABLE 1
The foregoing is a more detailed description of the present application in connection with specific embodiments thereof, and it is not intended that the present application be limited to the specific embodiments thereof. It will be apparent to those skilled in the art from this disclosure that many more simple derivations or substitutions can be made without departing from the inventive concepts herein.
Claims (5)
1. The processing method of the arc-shaped battery is characterized by comprising the following steps of:
s1, before packaging a battery, adjusting the length of an aluminum-plastic film on a second surface of the battery to be larger than that of an aluminum-plastic film on a first surface of the battery, and reserving an aluminum-plastic film at the tail position of the second surface after packaging;
s2, horizontally placing the packaged battery on a second pressure piece group and a third pressure piece group;
s3, hot-pressing the first surface by a first pressing piece, hot-pressing the second surface by the second pressing piece group and the third pressing piece group, and rolling the second pressing piece group and the third pressing piece group when the second surface is hot-pressed;
the first pressing piece moves downwards, and the second pressing piece group and the third pressing piece group respectively move leftwards and rightwards at the same speed, so that the first surface and the second surface are bent in the same direction or
The second pressing piece group and the third pressing piece group move upwards in the vertical direction and move leftwards and rightwards at the same speed in the horizontal direction respectively to enable the first surface and the second surface to bend in the same direction;
and obtaining the arc-shaped battery with the bent unidirectional opening.
2. The arc battery processing method according to claim 1, wherein in S1, the greater the degree of bending of the battery, the greater the length of the aluminum plastic film of the second surface.
3. The method of manufacturing arc-shaped batteries according to claim 1, wherein the arc of curvature of the batteries is 0 ° to 180 °.
4. An arc-shaped battery processing device with the processing method of any one of claims 1~3, comprising: the first pressing piece, the second pressing piece group and the third pressing piece group; the second pressing piece group and the third pressing piece group are positioned on the same horizontal line and are used for carrying out hot pressing on the second surface of the battery; the first pressing piece is located above a midpoint between the second pressing piece group and the third pressing piece group and used for hot pressing of a first surface of the battery, the second pressing piece group comprises n second pressing pieces, the third pressing piece group comprises n third pressing pieces, n is larger than or equal to 1, action surfaces of the first pressing piece group, the second pressing piece group and the third pressing piece group on the battery are circular surfaces, and the n second pressing pieces and the n third pressing pieces are located on the same horizontal line.
5. An arc-shaped battery, characterized in that the arc-shaped battery is manufactured by the processing method of any one of claims 1 to 3.
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| TWM482169U (en) * | 2013-07-05 | 2014-07-11 | Power Source Energy Co Ltd | Curved battery |
| CN104157900A (en) * | 2014-08-14 | 2014-11-19 | 惠州亿纬锂能股份有限公司 | Pouch arc-shaped electrical core and processing technology thereof |
| CN105870506B (en) * | 2015-01-23 | 2018-08-10 | 深圳市格瑞普电池有限公司 | The method and equipment of aluminum plastic film encapsulation |
| CN109585905B (en) * | 2018-12-24 | 2023-11-03 | 广东维都利新能源有限公司 | Method for manufacturing arc-shaped flexible package lithium battery |
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| CN107591566A (en) * | 2016-07-08 | 2018-01-16 | 宁德新能源科技有限公司 | Arc secondary cell forming method |
| CN106374134A (en) * | 2016-11-25 | 2017-02-01 | 惠州市恒泰科技股份有限公司 | Arc-shaped bending battery and manufacturing method and manufacturing die thereof |
| KR20210029109A (en) * | 2019-09-05 | 2021-03-15 | 주식회사 엘지화학 | Secondary battery and method of manufacturing the same |
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