CN113725498B - Manufacturing method of soft-package button cell and soft-package button cell - Google Patents
Manufacturing method of soft-package button cell and soft-package button cell Download PDFInfo
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- CN113725498B CN113725498B CN202110873636.7A CN202110873636A CN113725498B CN 113725498 B CN113725498 B CN 113725498B CN 202110873636 A CN202110873636 A CN 202110873636A CN 113725498 B CN113725498 B CN 113725498B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 59
- 239000011888 foil Substances 0.000 claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims abstract description 25
- 238000005452 bending Methods 0.000 claims abstract description 10
- 238000003466 welding Methods 0.000 claims abstract description 6
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 17
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 239000003792 electrolyte Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000003698 laser cutting Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000002390 adhesive tape Substances 0.000 claims description 2
- 238000009957 hemming Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- 229910052782 aluminium Inorganic materials 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 238000000576 coating method Methods 0.000 description 7
- 239000002985 plastic film Substances 0.000 description 7
- 229920006255 plastic film Polymers 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 238000004049 embossing Methods 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007901 soft capsule Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound 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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
- H01M50/466—U-shaped, bag-shaped or folded
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
-
- 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
Abstract
The application discloses a manufacturing method of a soft-package button cell and a soft-package button cell, wherein the manufacturing method comprises the following steps: cutting a part of rectangular area at one end of the pole piece and one end of the diaphragm to form an L-shaped structure; step two, welding a positive electrode lug and a negative electrode lug on the empty foil areas of the positive electrode plate and the negative electrode plate respectively; sequentially winding the positive plate, the diaphragm and the negative plate to obtain a bare cell, wherein the bare cell comprises a first winding core and a second winding core, and the diameter of the first winding core is smaller than that of the second winding core; and step four, bending the positive electrode lug and the negative electrode lug of the bare cell, and then placing the bent positive electrode lug and the bent negative electrode lug into a punched soft envelope for packaging to obtain the soft-package buckle type cell. The application ensures that the bending part of the tab is accommodated on the side surface of the first winding core and does not protrude from the soft envelope surface of the soft envelope button type battery core, thereby ensuring the surface flatness of the bare battery core.
Description
Technical Field
The application belongs to the technical field of batteries, and particularly relates to a manufacturing method of a soft-package button cell and a soft-package button battery.
Background
The lithium ion battery is an important power supply device at present because of the characteristics of high voltage of a self-discharging platform, small self-discharging, high energy density, no memory effect, green and environment-friendly performance and the like, and is widely applied to various electronic equipment and vehicles. With the increasing number of portable devices, lithium ion batteries are becoming smaller in size, and button-type lithium ion batteries are being developed specifically for such applications. Button cells refer to small-size lithium ion cells in round or quasi-round shapes, which are button-like, and can be mainly divided into steel shell button cells and soft package button cells. Compared with a steel shell button cell, the soft-package button cell has explosion protection, high safety and flexible and changeable size, and is widely applied to the fields of TWS earphones, intelligent wearing products and the like.
After the existing soft-package button cell bare cell is wound, the tab is positioned at one end of the winding core, the tab is required to be reversely folded for 180 degrees and then folded for 90 degrees to be packaged by an aluminum plastic film, and at the moment, 2 problems are generated: 1. when the tab is folded for the first time, the tab is thicker and harder, obvious bulges can be generated, and the risk of liquid leakage caused by puncturing the aluminum plastic film exists; 2. the lug with the structure is positioned on the outer surface of the bare cell, is more outstanding, increases the diameter of the cell, is extremely easy to be acted by external force in the process of post-process sample preparation or product transportation, leads to the damage of an aluminum plastic film, further generates liquid leakage, and has great hidden trouble on the use of the soft-package button cell. In addition, after the aluminum plastic film is sealed, the battery cell with the skirt structure is formed through embossing and flanging, the occupied space of the skirt structure is large, and the energy density of the battery cell is reduced.
Disclosure of Invention
The application aims to provide a manufacturing method of a soft-package button cell and the soft-package button cell, wherein an L-shaped structure is obtained by cutting a pole piece and a diaphragm, so that the diameter of the pole piece of a first coiled core obtained after coiling is smaller than that of a second coiled core, the bent part of a pole lug is contained in the cut part and cannot protrude out of the soft-envelope surface of a bare cell, the surface smoothness of the bare cell is ensured, and liquid leakage caused by soft-envelope breakage in the process of sample preparation in the later working procedure or product transportation is avoided.
In order to achieve the aim of the application, the application adopts the following technical scheme:
the application discloses a manufacturing method of a soft-package buckle type battery cell, which comprises the following steps:
cutting a part of rectangular area at one end of the pole piece and one end of the diaphragm to form an L-shaped structure;
step two, welding a positive electrode lug and a negative electrode lug on the empty foil areas of the positive electrode plate and the negative electrode plate respectively;
sequentially winding the positive plate, the diaphragm and the negative plate to obtain a bare cell, wherein the bare cell comprises a first winding core and a second winding core, and the diameter of the first winding core is smaller than that of the second winding core;
and step four, bending the positive electrode lug and the negative electrode lug of the bare cell, and then placing the bent positive electrode lug and the bent negative electrode lug into a punched soft envelope for packaging to obtain the soft-package buckle type cell.
After the pole piece and the diaphragm are wound, the positive pole lug and the negative pole lug are arranged on the side face of the bare cell, the first winding core is formed by winding the pole piece of the residual short part after being cut, the second winding core is formed by winding the pole piece of the long part which is not cut, the first winding core is arranged above the second winding core, and the diameter of the first winding core is smaller than that of the second winding core, so that the bending part of the positive pole lug and the negative pole lug after bending can not be raised on the surface of the bare cell, the soft coating is prevented from being damaged due to external force action in the process of sample preparation or product transportation, liquid leakage is further generated, meanwhile, the space utilization rate and the energy density are improved due to the structure of the bare cell, and the soft coating comprises an aluminum plastic film.
Specifically, the positive plate, the negative plate and the diaphragm are subjected to die cutting or laser cutting to prepare the L-shaped structure. The pole piece and the diaphragm can be precisely cut through die cutting and laser cutting.
Specifically, adhesive paper is stuck at the tail end of the second winding core. Through paste the gummed paper in the ending department that the second coiled core was convoluteed, the receipts that can be fine is rolled up the coiled core, reduces the volume of naked electric core improves naked electric core's energy density, in the encapsulation in-process, because naked electric core is at the ending department gummed paper of pasting, can prevent to roll up the core and scatter and disorderly, fine will naked electric core is put into in the soft coating has improved production efficiency.
Specifically, the cut positive electrode sheet and the cut negative electrode sheet include a main body portion and a cutting portion, and the width of the cutting portion is smaller than the width of the main body portion. The diameter of the first winding core of the bare cell obtained when the positive plate and the negative plate are wound is smaller than that of the second winding core, so that the positive lug and the negative lug are contained on the side face of the first winding core after being bent, and the surface of the bare cell cannot be raised.
Specifically, the empty foil region is disposed at any one of the cut portion, an end portion of the cut portion, or a region of the main body portion near the cut portion. The empty foil area is not coated with active slurry or is coated with the active slurry and is cleaned, and the tab is welded on the empty foil area, so that the empty foil area is arranged at the position, and the tab is arranged on the side face of the bare cell after the pole piece is wound.
Specifically, when the empty foil area is arranged at the cutting part or the end part of the cutting part, the tab welded at the empty foil area is bent by 90 degrees in the vertical direction before packaging. The tab is bent, so that the soft coating is prevented from being pierced in the packaging process of the tab, and the tab adhesive adhered to the tab is required to be arranged between the two soft coatings.
Specifically, when the empty foil area is arranged in the main body part near the cutting part area, the positive electrode lug and the negative electrode lug welded in the empty foil area are firstly folded by 180 degrees in the vertical direction before being packaged, and then folded by 90 degrees in the vertical direction.
The application also discloses a soft-package button cell, which is prepared by baking, liquid injection, formation, two sealing and edge folding the soft-package button cell according to any one of the schemes. The energy density of the prepared soft-package button cell is improved, meanwhile, as the diameters of the second winding core and the first winding core are different, after the tab is bent, the bending part can be used for converging the first winding core formed by winding the cut part of pole piece, after the tab is packaged, the surface of the soft-package film is not protruded, the surface is flat, and the problem of liquid leakage caused by the breakage of the soft-package film in the process of sample preparation in the later working procedure or product transportation is avoided.
Further, the two seals include: the soft-package buckle type battery cell is subjected to centrifugal movement, so that separation of electrolyte and formation generated gas is realized; carrying out vacuumizing treatment on the gas generated by formation in the air bag, and reflowing the soft-package buckle type battery cell under the action of centrifugal force of the electrolyte; and sealing the side edges between the air bag and the soft-package buckle type battery cell. And the secondary sealing is carried out on the battery, so that the formation generated gas is removed, the vacuum degree in the soft-package buckle type battery cell is higher, and the pole piece is better in lamination.
Further, the soft envelope is embossed prior to hemming to form a skirt structure. The skirt edge structure after embossing and flanging is the same as the second coil core of the bare cell in diameter, extruded lines are inwards folded, the volume of the soft-package button cell is reduced, and the energy density of the cell is improved.
Compared with the prior art, the application at least comprises the following beneficial effects: according to the application, the L-shaped structure is obtained by cutting the pole piece and the diaphragm, so that the diameter of the first winding core obtained after winding is smaller than that of the second winding core, the bent part of the pole lug is accommodated at the side surface of the first winding core and cannot protrude out of the soft envelope surface of the soft-covered buckle type battery core, the surface smoothness of the soft-covered buckle type battery core is ensured, liquid leakage caused by soft envelope breakage in the process of carrying out post-process sample preparation or product transportation is avoided, meanwhile, the diameter of the bare battery core is not increased, and the energy density of the soft-covered buckle type battery core is improved.
Drawings
FIG. 1 is a flow chart of a method for manufacturing a soft-pack buckle type battery cell according to the present application;
FIG. 2 is a schematic diagram of a cut pole piece according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a bare cell according to an embodiment of the present application;
fig. 4 is a schematic structural diagram illustrating bending of a tab of a bare cell according to an embodiment of the present application;
FIG. 5 is a schematic view of a soft capsule according to an embodiment of the present application;
FIG. 6 is a schematic view of a heat seal of a soft envelope according to one embodiment of the present application;
FIG. 7 is a schematic view of a soft pack button cell according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a cut pole piece according to an embodiment of the present application;
FIG. 9 is a schematic diagram of a cut pole piece according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a bare cell according to an embodiment of the present application;
fig. 11 is a schematic structural diagram illustrating bending of a tab of a bare cell according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of a bare cell according to an embodiment of the present application;
fig. 13 is a schematic structural diagram illustrating bending of a tab of a bare cell according to an embodiment of the present application;
fig. 14 is a schematic structural diagram of a bare cell according to an embodiment of the present application;
in the figure: 1-pole pieces; 11-a body portion; 12-a cutting part; 13-empty foil areas; 2-bare cell; 21-a first winding core; 22-a second winding core; 3-electrode lugs; 31-positive electrode lugs; 32-negative electrode ear; 4-gummed paper; 5-soft coating; 51-pit punching; 52-an air bag; 53-skirt structure; 6-soft pack button cell.
Detailed Description
The application will be further described in connection with the accompanying drawings for the purpose of facilitating understanding of the application, but the application may be embodied in many different forms and is not limited to the embodiments described herein nor is it to be construed as being limited to any of the embodiments set forth herein.
Example 1
As shown in fig. 1 to 7, the coating, rolling and cutting of the positive and negative electrode plates are finished firstly, the positive and negative electrode plates and the diaphragm are die cut or cut by laser to obtain a main body part 11 and a cutting part 12, the width of the cutting part 12 is smaller than that of the main body part 11, the main body part 11 and the cutting part 12 form an L-shaped structure as shown in fig. 2, the main body part 11 is completely coated with active material slurry, the cutting part 12 is provided with an empty foil area 13, the empty foil area 13 is an uncoated active slurry or a electrode plate 1 with the active slurry being cleaned, the electrode plate is used for welding a tab 3, an aluminum tab is welded on the empty foil area 13 of the positive electrode plate to serve as a positive tab 31, and a nickel tab is welded on the empty foil area 13 of the negative electrode plate to serve as a negative tab 32.
As shown in fig. 3, the positive electrode sheet, the separator and the negative electrode sheet are sequentially wound to form a bare cell 2, the bare cell 2 is divided into an upper part and a lower part, the upper part is a first winding core 21, the lower part is a second winding core 22, the diameter of the first winding core 21 is smaller than that of the second winding core 22, and adhesive tape 4 is adhered at the winding tail end of the second winding core 22 of the bare cell 2.
As shown in fig. 4, the positive electrode tab 31 and the negative electrode tab 32 of the bare cell 2 are respectively bent by 90 ° in the vertical direction.
As shown in fig. 5, due to the difference in diameter between the first winding core 21 and the second winding core 22, two circular pits of different sizes are punched out of the aluminum plastic film as the soft envelope 5 to obtain a punched pit 51.
As shown in fig. 6, the bare cell 2 is placed in an aluminum plastic film pit 51, and heat-sealed, to obtain a soft-pack button cell. The soft pack button cell 6 with the skirt structure 52 shown in fig. 7 is obtained by baking, filling, forming, sealing, embossing and flanging the soft pack button cell.
Wherein, two seals include: the soft-package buckle type battery cell is subjected to centrifugal movement, so that separation of electrolyte and gas generated by formation is realized; the gas generated by the formation in the gas bag 52 is vacuumized, and the electrolyte reflows the soft-package buckle type battery cell under the action of centrifugal force; the side between the air bag 52 and the soft-pack button cell is sealed. The skirt structure after embossing and flanging is the same as the second coil core 22 of the bare cell 2 in diameter, and the extruded texture is inwards folded, so that the volume of the soft-package button cell 6 is reduced, and the energy density of the cell is improved.
Example 2
Unlike embodiment 1, as shown in fig. 8, the end of the cutting portion 12 of the present embodiment is provided with a blank foil region 13 for welding the tab 3.
The rest of the process is identical to that of example 1 and will not be described in detail here.
Example 3
Unlike embodiment 1, this embodiment provides a region of the main body portion 11 near the cut portion 12 as an empty foil region 13 for welding the tab 3, as shown in fig. 9. An aluminum tab is welded on the positive plate as a positive tab 31, a nickel tab is welded on the negative plate as a negative tab 32, and then the positive and negative plates and the diaphragm are wound together to obtain the bare cell 2 shown in fig. 10. As shown in fig. 11, the positive tab 31 and the negative tab 32 on the side surface of the first winding core 21 are bent, the positive tab 31 and the negative tab 32 exceeding the upper surface of the first winding core 21 are bent vertically by 180 ° and then the positive tab 31 and the negative tab 32 of the bent portion are bent vertically by 90 °.
The rest of the process is identical to that of example 1 and will not be described in detail here.
Example 4
Unlike example 1, as shown in fig. 8, the end of the cut portion 12 of the positive electrode sheet of this example was set as the empty foil region 13, as shown in fig. 9, the main body portion 11 of the negative electrode sheet was set as the empty foil region 13 in the region near the cut portion 12, an aluminum tab was welded on the positive electrode sheet as the positive electrode tab 31, a nickel tab was welded on the negative electrode sheet as the negative electrode tab 32, and then the positive and negative electrode sheets were wound together with the separator to obtain the bare cell 2 as shown in fig. 12. As shown in fig. 13, the positive tab 31 exceeding the upper surface of the second winding core 22 is bent by 90 ° in the vertical direction, the negative tab 32 exceeding the upper surface portion of the first winding core 21 is bent by 180 ° in the vertical direction, and the negative tab 32 of the bent portion is bent by 90 ° in the vertical direction.
The rest of the process is identical to that of example 1 and will not be described in detail here.
Example 5
Unlike example 4, in this example, as shown in fig. 8, the end of the cut portion 12 of the negative electrode sheet was set as the empty foil region 13, as shown in fig. 9, the main body portion 11 of the positive electrode sheet was set as the empty foil region 13 in the region near the cut portion 12, an aluminum tab was welded on the positive electrode sheet as the positive electrode tab 31, a nickel tab was welded on the negative electrode sheet as the negative electrode tab 32, and then the positive and negative electrode sheets were wound together with the separator to obtain the bare cell 2 shown in fig. 14.
The rest of the process is identical to that of example 4 and will not be described here again.
The foregoing is a further detailed description of the application in connection with specific embodiments, and it is not intended that the application be limited to such description. It will be apparent to those skilled in the art that several simple deductions or substitutions can be made without departing from the inventive concept.
Claims (6)
1. The manufacturing method of the soft-package buckle type battery cell is characterized by comprising the following steps of:
cutting a part of rectangular area at one end of the pole piece and one end of the diaphragm to form an L-shaped structure;
step two, welding a positive electrode lug and a negative electrode lug on the empty foil areas of the positive electrode plate and the negative electrode plate respectively;
sequentially winding the positive plate, the diaphragm and the negative plate to obtain a bare cell, wherein the bare cell comprises a first winding core and a second winding core, the first winding core is obtained by winding the pole piece of which the short part remains after being cut, the second winding core is obtained by winding the pole piece of which the long part is not cut, the first winding core is arranged above the second winding core, and the diameter of the first winding core is smaller than that of the second winding core;
step four, bending the positive electrode lug and the negative electrode lug of the bare cell, and then placing the bent positive electrode lug and the bent negative electrode lug into a punched soft envelope for packaging to obtain a soft-package buckle type cell;
the cut positive electrode piece and the cut negative electrode piece comprise a main body part and a cutting part, and the width of the cutting part is smaller than that of the main body part; disposing the blank foil region at any one of the cut portion, an end of the cut portion, or a region of the main body portion proximate the cut portion; when the empty foil area is arranged at the cutting part or the end part of the cutting part, the tab welded at the empty foil area is bent by 90 degrees in the vertical direction before being packaged; when the empty foil area is arranged in the main body part and is close to the cutting part area, the positive electrode lug and the negative electrode lug welded in the empty foil area are firstly folded by 180 degrees in the vertical direction before being packaged, and then are folded by 90 degrees in the vertical direction.
2. The method for manufacturing the soft-package button cell according to claim 1, wherein the positive electrode plate, the negative electrode plate and the diaphragm are subjected to die cutting or laser cutting to prepare the L-shaped structure.
3. The method of claim 1, wherein an adhesive tape is applied to the winding end of the second winding core.
4. A soft-pack button cell, characterized in that it is produced by baking, liquid injection, formation, two-sealing and flanging the soft-pack button cell according to any one of claims 1 to 3.
5. The soft pack battery of claim 4, wherein the two seals comprise: the soft-package buckle type battery cell is subjected to centrifugal movement, so that separation of electrolyte and formation generated gas is realized; carrying out vacuumizing treatment on the gas generated by formation in the air bag, and reflowing the soft-package buckle type battery cell by the electrolyte under the action of centrifugal force; and pre-sealing the side edges between the air bag and the soft-package buckle type battery cell.
6. The soft pack battery of claim 4, wherein the soft cover is embossed prior to hemming to form a skirt structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110873636.7A CN113725498B (en) | 2021-07-30 | 2021-07-30 | Manufacturing method of soft-package button cell and soft-package button cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110873636.7A CN113725498B (en) | 2021-07-30 | 2021-07-30 | Manufacturing method of soft-package button cell and soft-package button cell |
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| CN113725498A CN113725498A (en) | 2021-11-30 |
| CN113725498B true CN113725498B (en) | 2023-11-07 |
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| CN111180787A (en) * | 2020-03-11 | 2020-05-19 | 广州鹏辉能源科技股份有限公司 | Lithium ion battery and manufacturing method thereof |
| CN111584920A (en) * | 2020-05-11 | 2020-08-25 | Oppo广东移动通信有限公司 | Preparation method of special-shaped battery |
| CN112531142A (en) * | 2020-12-10 | 2021-03-19 | 湖南立方新能源科技有限责任公司 | Pole piece for soft package button battery, button battery and preparation method of pole piece |
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2021
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| JP2000348754A (en) * | 1999-06-02 | 2000-12-15 | Toyota Central Res & Dev Lab Inc | Rolled electrode type battery |
| CN106450497A (en) * | 2016-12-08 | 2017-02-22 | 东莞市迈科新能源有限公司 | Multi-roll-core double-lug soft-package battery and production method thereof |
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| CN111180787A (en) * | 2020-03-11 | 2020-05-19 | 广州鹏辉能源科技股份有限公司 | Lithium ion battery and manufacturing method thereof |
| CN111584920A (en) * | 2020-05-11 | 2020-08-25 | Oppo广东移动通信有限公司 | Preparation method of special-shaped battery |
| CN112531142A (en) * | 2020-12-10 | 2021-03-19 | 湖南立方新能源科技有限责任公司 | Pole piece for soft package button battery, button battery and preparation method of pole piece |
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