CN111313077A - Manufacturing method of button lithium battery - Google Patents
Manufacturing method of button lithium battery Download PDFInfo
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- CN111313077A CN111313077A CN202010275492.0A CN202010275492A CN111313077A CN 111313077 A CN111313077 A CN 111313077A CN 202010275492 A CN202010275492 A CN 202010275492A CN 111313077 A CN111313077 A CN 111313077A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000004804 winding Methods 0.000 claims abstract description 82
- 230000002093 peripheral effect Effects 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 125000006850 spacer group Chemical group 0.000 claims description 10
- 239000002390 adhesive tape Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 8
- 230000004888 barrier function Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 206010040007 Sense of oppression Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000002035 prolonged effect Effects 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
- 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
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
-
- 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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/153—Lids or covers characterised by their shape for button or coin cells
-
- 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/216—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for button or coin cells
-
- 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)
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention relates to a manufacturing method of a button lithium battery, which comprises the following steps: providing a first electrode assembly, a second electrode assembly, a first cover body, a second cover body, an insulating space ring and two diaphragms, wherein the first electrode assembly comprises a first electrode plate and two first dressings which are respectively connected to two sides of the first electrode plate, one side of the first electrode plate is flush with the edge of the first dressings, and the other side of the first electrode plate extends out of the first dressings; the second electrode assembly comprises a second electrode plate and two second dressings which are respectively connected to two sides of the second electrode plate, one side of the second electrode plate is flush with the edge of the second dressings, and the other side of the second electrode plate extends through the second dressings; manufacturing the separator, the first electrode assembly, the separator and the second electrode assembly into a winding core; and assembling the winding core, the first cover body, the second cover body and the insulating space ring together, and buckling the first cover body and the second cover body. The invention has the advantages that: the internal resistance is small, the self-loss is small and the heating is not easy to occur during the work.
Description
Technical Field
The invention relates to the technical field of button batteries, in particular to a manufacturing method of a button lithium battery.
Background
Button cells, also known as button cells, are generally larger in diameter and thinner in thickness, and have been widely used in various microelectronic products due to their smaller size.
Referring to fig. 1, the most common button cell at present includes a first cover 2 and a second cover 3 that are fastened to each other, a mounting cavity is formed in the first cover 2 and the second cover 3, a winding core 1 is disposed in the mounting cavity, and an insulating spacer ring 4 is disposed between a peripheral side wall of the first cover 2 and a peripheral side wall of the second cover 3; a negative pole tab 13 is led out from the negative pole of the winding core 1, a positive pole tab 14 is led out from the positive pole of the winding core 1, the positive pole tab 14 is attached to the outer peripheral wall of the winding core 1 through bending, the positive pole tab 14 is abutted to the inner side wall of the first cover body 2, and the positive pole tab 14 is separated from the inner side wall of the second cover body 3 through an insulating space ring 4; the negative pole tab 13 is in a shape of' through bending, and the negative pole tab 13 is abutted or welded with the bottom wall of the inner side of the second cover body 3. Because the areas of the positive electrode tab 14 and the negative electrode tab 13 are small, the contact area between the positive electrode tab 14 and the first cover body 2 is small, and the contact area between the negative electrode tab 13 and the second cover body 3 is small, the internal resistance of the button cell is high, the button cell is not beneficial to slightly large current discharge, and the button cell is continuously used because the internal resistance is large, the self-loss is large and the button cell easily generates heat.
Disclosure of Invention
The invention aims to provide a manufacturing method of a button lithium battery, which has the advantages that: the internal resistance is small, the self-loss is small and the heating is not easy to occur during the work.
The above object of the present invention is achieved by the following technical solutions: a manufacturing method of a button lithium battery comprises the following steps:
providing a first electrode assembly, a second electrode assembly, a first cover body, a second cover body, an insulating space ring and two diaphragms, wherein the first electrode assembly comprises a first electrode plate and two first dressings which are respectively connected to two sides of the first electrode plate, one side of the first electrode plate is flush with the edge of the first dressings, and the other side of the first electrode plate extends out of the first dressings; the second electrode assembly comprises a second electrode plate and two second dressings which are respectively connected to two sides of the second electrode plate, one side of the second electrode plate is flush with the edge of the second dressings, and the other side of the second electrode plate extends through the second dressings;
sequentially stacking the diaphragm, the first electrode assembly, the diaphragm and the second electrode assembly, wherein two sides of the diaphragm extend out of two sides of the first dressing and two sides of the second dressing, and one side of the first electrode plate extending out of the first dressing and one side of the second electrode plate extending out of the second dressing respectively extend out of two opposite sides of the diaphragm;
taking one end of the diaphragm positioned on one side of the first electrode assembly, which is opposite to the second electrode assembly, as a center, and winding the diaphragm, the first electrode assembly and the second electrode assembly to form a winding core with an axial cavity in the middle;
the winding core, the first cover body, the second cover body and the insulating space ring are assembled together, the first cover body is buckled with the second cover body, the insulating space ring is arranged between the side wall of the first cover body and the side wall of the second cover body, the winding core is arranged on the first cover body and the second cover body, the first electrode plate is abutted to the bottom wall of the first cover body, and the second electrode plate is abutted to the bottom wall of the second cover body.
Through above-mentioned technical scheme, the long edge face and the first lid direct contact of first electrode slice, the long edge face and the second lid direct contact of second electrode slice to make first electrode slice and first lid large tracts of land contact, second electrode slice and second lid large tracts of land contact, thereby reduced the battery internal resistance, thereby make the battery be difficult to generate heat at the during operation, thereby reduced the loss of battery self, improved the life-span of battery.
In the button cell mentioned in the background art, since the positive electrode tab is tightly pressed between the first cover body peripheral wall and the second cover body side peripheral wall, a gap exists between the first cover body peripheral wall and the second cover body side peripheral wall, so that the button cell has a high possibility of liquid leakage. In the button lithium battery disclosed by the invention, no tab extends between the peripheral side wall of the first cover body and the peripheral side wall of the second cover body, so that the probability of liquid leakage is greatly reduced.
The invention is further configured to: a chamfer is arranged at the outer edge of the closed end of the first cover body; and a chamfer is arranged at the outer edge of the closed end of the second cover body.
According to the technical scheme, when the winding core, the first cover body, the second cover body and the insulating space ring are assembled together, the chamfer angle on the first cover body can press the part, located at the edge of the winding core, of the first electrode plate towards the direction of the axial cavity, so that the part, located at the edge of the winding core, of the first electrode plate is bent and deformed; similarly, the second cover body can press the part of the second electrode plate extending out of the second dressing to be bent and deformed so as to increase the contact area between the second electrode plate and the second cover body, and therefore the internal resistance of the battery is reduced.
The invention is further configured to: the bottom wall of the inner side of the first cover body is provided with a wave-shaped bulge; the bottom wall of the inner side of the second cover body is also provided with a wave-shaped bulge; the orthographic projection of the wavy bulge on the first cover body on the bottom wall of the first cover body is in a spiral shape; the orthographic projection of the wave-shaped bulge on the second cover body on the bottom wall of the second cover body is in a spiral shape.
Through the technical scheme, when the winding core is produced and manufactured, the influence of manufacturing precision is sometimes caused, one side of the first electrode plate extending out of the first dressing is difficult to control on the same plane, one side of the second electrode plate extending out of the second dressing is also difficult to control on the same plane, therefore, the contact area of the first electrode plate and the first cover body is always smaller than that in a theoretical state, the contact area of the second electrode plate and the second cover body is also always smaller than that in the theoretical state, the actual internal resistance of the battery is slightly larger than that calculated in the theoretical state, and the influence caused by insufficient contact between the first electrode plate and the first cover body and insufficient contact between the second electrode plate and the second cover body can be greatly compensated by the arrangement of the wavy bulges.
When the winding core is installed in the first cover body and the second cover body, the wavy bulge on the first cover body is just inserted into the gap of the first electrode plate, so that the contact area of the first cover body and the first electrode plate is increased; similarly, the wavy bulge on the second cover body is just inserted into the gap of the second electrode plate, so that the contact area of the second cover body and the second electrode plate is increased, and the internal resistance of the battery is greatly reduced.
The invention is further configured to: when the winding core, the first cover body, the second cover body and the insulating space ring are assembled together, two gaskets are also arranged in the first cover body and the second cover body and are respectively positioned at two ends of the winding core; and a groove for inserting the first electrode plate or the second electrode plate is formed on one side of the gasket facing the winding core.
Through the technical scheme, the part of the first electrode plate extending out of the first dressing is just inserted into the groove on the gasket, so that the contact area between the first cover body and the first electrode plate is greatly increased; similarly, the part of the second electrode plate extending out of the second dressing is just inserted into the groove on the gasket, so that the contact area between the second cover body and the second electrode plate is increased, and the internal resistance of the battery is greatly reduced.
The invention is further configured to: before the winding core, the first cover body, the second cover body and the insulating barrier ring are assembled together, an aluminum strip is welded between the bottom wall of the inner side of the bottom of the first cover and one side of the first electrode plate extending through the first dressing, and a nickel foil is welded between the bottom wall of the inner side of the second cover body and one side of the second electrode plate extending through the second dressing; the aluminum strip is folded between the first cover body and the winding core in a Z-shaped folding mode; the nickel foil is folded between the second cover body and the winding core in a Z-shaped folding mode.
According to the technical scheme, when the winding core is produced and manufactured, the influence of manufacturing precision is caused sometimes, one side of the first electrode plate extending out of the first dressing is difficult to control on the same plane, and one side of the second electrode plate extending out of the second dressing is also difficult to control on the same plane, so that the contact area of the first electrode plate and the first cover body is always smaller than that in a theoretical state, the contact area of the second electrode plate and the second cover body is always smaller than that in the theoretical state, and the actual internal resistance of the battery is slightly larger than that calculated in the theoretical state; the aluminum strip and the nickel foil are soft in texture and easy to deform, so that when the aluminum strip is welded between the first electrode plate and the first cover body, the two ends of the aluminum strip are easily ensured to have high contact areas with the first electrode plate and the first cover body respectively; similarly, when the nickel foil is welded between the second electrode plate and the second cover body, the two ends of the nickel foil are easily ensured to have high contact areas with the second electrode plate and the second cover body respectively, so that the influences caused by insufficient contact between the first electrode plate and the first cover body and insufficient contact between the second electrode plate and the second cover body can be greatly compensated.
When the winding core is installed in the first cover body and the second cover body, the wavy bulge on the first cover body is just inserted into the gap of the first electrode plate, so that the contact area of the first cover body and the first electrode plate is increased; similarly, the wavy bulge on the second cover body is just inserted into the gap of the second electrode plate, so that the contact area of the second cover body and the second electrode plate is increased, and the internal resistance of the battery is greatly reduced.
The invention is further configured to: after the separator, the first electrode assembly, and the second electrode assembly were wound into a winding core, the outer peripheral wall of the winding core was wound with an adhesive tape to fix the winding core.
Through above-mentioned technical scheme, make roll up the core setting, effectively avoid rolling up the core and scatter before first lid and the second lid of packing into.
The above object of the present invention is achieved by the following technical solutions: a manufacturing method of a button lithium battery comprises the following steps:
providing a first electrode assembly, a second electrode assembly, a first cover body, a second cover body, an insulating space ring and two diaphragms, wherein the first electrode assembly comprises a first electrode plate and two first dressings which are respectively connected to two sides of the first electrode plate, one side of the first electrode plate is flush with the edge of the first dressings, and the other side of the first electrode plate extends out of the first dressings; the second electrode assembly comprises a second electrode plate and two second dressings which are respectively connected to two sides of the second electrode plate, two sides of the second electrode plate are flush with two sides of the second dressings, and one end of the second electrode plate extends through the second dressings and is fixed with a second tab;
sequentially stacking the diaphragm, the first electrode assembly, the diaphragm and the second electrode assembly, so that two sides of the diaphragm extend out of two sides of the first dressing and two sides of the second dressing; taking one end of the diaphragm positioned on one side of the first electrode assembly, which is opposite to the second electrode assembly, as a center, and winding the diaphragm, the first electrode assembly and the second electrode assembly to form a winding core with an axial cavity in the middle; bending the second pole lug towards the direction of the axial cavity to enable the second pole lug to be attached to the edge of the diaphragm;
the winding core, the first cover body, the second cover body and the insulating space ring are assembled together, the first cover body is buckled with the second cover body, the insulating space ring is arranged between the side wall of the first cover body and the side wall of the second cover body, the winding core is arranged on the first cover body and the second cover body, the first electrode plate is abutted to the bottom wall of the first cover body, and the second electrode tab is welded to the bottom wall of the second cover body.
Through above-mentioned technical scheme, the long edge face and the first lid direct contact of first electrode slice, second utmost point ear and second lid direct contact to make first electrode slice and first lid large tracts of land contact, thereby reduced the battery internal resistance, thereby make the battery be difficult to generate heat at the during operation, thereby reduced the loss of battery self, improved the life-span of battery.
The invention is further configured to: and a chamfer is arranged at the outer edge of the closed end of the first cover body.
Through the technical scheme, to roll up the core, first lid, when second lid and insulating space ring equipment are in the same place, chamfer on the first lid can press down the part that first electrode piece is in roll core edge to axial cavity place direction, thereby make the part that first electrode piece is in roll core edge take place bending deformation, because first electrode piece is continuous, so after bending deformation takes place for the part that first electrode piece is in roll core edge, under the oppression of first lid, bending deformation can all take place for the part that first electrode piece stretches out first dressing, thereby effectively increased the area of contact between first electrode piece and the first lid, thereby the internal resistance of battery has been reduced.
The invention is further configured to: after the separator, the first electrode assembly, and the second electrode assembly were wound into a winding core, the outer peripheral wall of the winding core was wound with an adhesive tape to fix the winding core.
Through above-mentioned technical scheme, make roll up the core setting, effectively avoid rolling up the core and scatter before first lid and the second lid of packing into.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the internal resistance is small, the self-loss is small during working, and the heating is not easy to occur;
2. the button lithium battery can improve the charge-discharge rate, reduce the internal polarization of the battery and prolong the service life of the battery;
3. the probability of liquid leakage is low.
Drawings
Fig. 1 is an exploded schematic view of a conventional button cell;
FIG. 2 is a schematic structural diagram according to the first embodiment;
FIG. 3 is a schematic structural view of the second embodiment;
FIG. 4 is a schematic structural view of the third embodiment;
FIG. 5 is a schematic structural view of the fourth embodiment;
FIG. 6 is a schematic structural diagram of the fifth embodiment.
In the figure, 1, a core; 11. a first electrode assembly; 111. a first electrode sheet; 112. a first dressing; 12. a second electrode assembly; 121. a second electrode sheet; 122. a second dressing; 123. a second tab; 13. a negative electrode tab; 14. a positive electrode tab; 15. a diaphragm; 2. a first cover body; 21. a wave-shaped bulge; 3. a second cover body; 4. an insulating space ring; 6. a gasket; 7. an aluminum strip; 8. a nickel foil.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, in the button cell mentioned in the background art, since the positive electrode tab 14 is tightly pressed between the peripheral wall of the first cover 2 and the peripheral wall of the second cover 3, a gap exists between the peripheral wall of the first cover 2 and the peripheral wall of the second cover 3, so that the button cell has a high possibility of liquid leakage.
The first embodiment is as follows:
referring to fig. 2, the method for manufacturing a button lithium battery disclosed by the invention comprises the following steps:
a first electrode assembly 11, a second electrode assembly 12, a first lid 2, a second lid 3, an insulating spacer 4, and two separators 15 are provided. The first electrode assembly 11 includes a first electrode tab 111 and two first dressings 112 respectively connected to both sides of the first electrode tab 111, one side of the first electrode tab 111 is flush with the edge of the first dressing 112, and the other side thereof extends over the first dressing 112; the second electrode assembly 12 comprises a second electrode sheet 121 and two second dressings 122 respectively connected to two sides of the second electrode sheet 121, one side of the second electrode sheet 121 is flush with the edge of the second dressing 122, and the other side of the second electrode sheet extends through the second dressing 122; the first cover body 2 and the second cover body 3 are metal covers, and chamfers are arranged on the outer edge of the closed end of the first cover body 2 and the outer edge of the closed end of the second cover body 3.
The separator 15, the first electrode assembly 11, the separator 15, and the second electrode assembly 12 are sequentially stacked such that both sides of the separator 15 extend across both sides of the first dressing 112 and both sides of the second dressing 122, and one side of the first electrode tab 111 extending across the first dressing 112 and one side of the second electrode tab 121 extending across the second dressing 122 extend across opposite sides of the separator 15, respectively; then taking one end of the separator 15 positioned on one side of the first electrode assembly 11 opposite to the second electrode assembly 12 as a center, and winding the separator 15, the first electrode assembly 11 and the second electrode assembly 12 to form a winding core 1 with an axial cavity in the middle; the outer peripheral wall of the core 1 is then wound with an adhesive tape to fix the core 1.
It should be noted that in the present embodiment, the first electrode tab 111 is a positive electrode of a button lithium battery, and the second electrode tab 121 is a negative electrode of the button lithium battery. In the first electrode assembly 11, the first dressing 112 located outside the first electrode sheet 111 is slightly short, so that after the winding core 1 is wound and formed, the first dressing 112 is not arranged outside the outermost circle of the first electrode assembly 11.
Placing the winding core 1 into the first cover body 2, and enabling the first electrode sheet 111 to be in contact with the bottom wall of the inner side of the first cover body 2; then the insulating space ring 4 is sleeved on the peripheral wall of the first cover body 2, and then the second cover body 3 is buckled on the first cover body 2 and the second cover body 3 are pressed by force.
When the first cover body 2 and the second cover body 3 are pressed forcibly, the chamfer angle on the first cover body 2 can press the part of the first electrode sheet 111 at the edge of the winding core 1 towards the direction of the axial cavity, so that the part of the first electrode sheet 111 at the edge of the winding core 1 is bent and deformed, and because the first electrode sheet 111 is continuous, after the part of the first electrode sheet 111 at the edge of the winding core 1 is bent and deformed, the part of the first electrode sheet 111 extending out of the first dressing 112 is bent and deformed under the compression of the first cover body 2, so that the first electrode sheet 111 is in full contact with the first cover body 2; similarly, the second cover 3 will also press the part of the second electrode sheet 121 extending out of the second dressing 122 to be bent and deformed, so that the second electrode sheet 121 and the second cover 3 are in full contact; after the first cover body 2 and the second cover body 3 are pressed, the chamfer part of the first cover body 2 passes through the exposed part of the first electrode sheet 111 by 0.3-0.7mm, and the chamfer part of the second cover body 3 passes through the exposed part of the second electrode sheet 121 by 0.3-0.7mm, so that the first electrode sheet 111 and the second electrode sheet 121 are bent by a sufficient angle.
This embodiment reduces the internal resistance of the battery through increasing the contact area of two poles of the core 1 and the first lid 2 and the second lid 3 to make the battery difficult to generate heat at the during operation, thereby reduced the loss of battery self, improved the life-span of battery. And the peripheral wall of the first cover body 2 and the peripheral wall of the second cover body 3 are sealed by the insulating space ring 4, so that the probability of liquid leakage is greatly reduced.
Example two:
referring to fig. 3, the manufacturing method of another button lithium battery disclosed by the invention comprises the following steps:
a first electrode assembly 11, a second electrode assembly 12, a first lid 2, a second lid 3, an insulating spacer 4, and two separators 15 are provided. The first electrode assembly 11 includes a first electrode tab 111 and two first dressings 112 respectively connected to both sides of the first electrode tab 111, one side of the first electrode tab 111 is flush with the edge of the first dressing 112, and the other side thereof extends over the first dressing 112; the second electrode assembly 12 comprises a second electrode sheet 121 and two second dressings 122 respectively connected to two sides of the second electrode sheet 121, one side of the second electrode sheet 121 is flush with the edge of the second dressing 122, and the other side of the second electrode sheet extends through the second dressing 122; the wave-shaped bulge 21 is arranged on the bottom wall of the inner side of the first cover body 2; the bottom wall of the inner side of the second cover body 3 is also provided with a wave-shaped bulge 21; the orthographic projection of the wavy bulge 21 on the first cover body 2 on the bottom wall of the first cover body 2 is in a spiral shape; the orthogonal projection of the wave-shaped bulge 21 on the second cover body 3 on the bottom wall of the second cover body 3 is in a spiral shape.
The separator 15, the first electrode assembly 11, the separator 15, and the second electrode assembly 12 are sequentially stacked such that both sides of the separator 15 extend across both sides of the first dressing 112 and both sides of the second dressing 122, and one side of the first electrode tab 111 extending across the first dressing 112 and one side of the second electrode tab 121 extending across the second dressing 122 extend across opposite sides of the separator 15, respectively; then taking one end of the separator 15 positioned on one side of the first electrode assembly 11 opposite to the second electrode assembly 12 as a center, and winding the separator 15, the first electrode assembly 11 and the second electrode assembly 12 to form a winding core 1 with an axial cavity in the middle; the outer peripheral wall of the core 1 is then wound with an adhesive tape to fix the core 1.
It should be noted that in the present embodiment, the first electrode tab 111 is a positive electrode of a button lithium battery, and the second electrode tab 121 is a negative electrode of the button lithium battery. In the first electrode assembly 11, the first dressing 112 located outside the first electrode sheet 111 is slightly short, so that after the winding core 1 is wound and formed, the first dressing 112 is not arranged outside the outermost circle of the first electrode assembly 11.
Placing the winding core 1 into the first cover body 2, and inserting the wavy bulge 21 on the first cover body 2 into the gap of the first electrode sheet 111 to increase the contact area of the first cover body 2 and the first electrode sheet 111; then, the insulating space ring 4 is sleeved on the outer peripheral wall of the first cover body 2; then, the second cover 3 is fastened to the first cover 2 and the second cover 3 are pressed together with force, and the wavy protrusions 21 on the second cover 3 are ensured to be just inserted into the gaps of the second electrode sheet 121, so that the contact area between the second cover 3 and the second electrode sheet 121 is increased.
This embodiment reduces the internal resistance of battery through the area of contact of the increase roll core 1 two poles of the earth and first lid 2 and second lid 3 to make the battery be difficult to generate heat at the during operation, thereby reduced the loss of battery self, improved the life-span of battery. And the peripheral wall of the first cover body 2 and the peripheral wall of the second cover body 3 are sealed by the insulating space ring 4, so that the probability of liquid leakage is greatly reduced.
Example three:
referring to fig. 4, the manufacturing method of another button lithium battery disclosed by the invention comprises the following steps:
a first electrode assembly 11, a second electrode assembly 12, a first lid 2, a second lid 3, an insulating spacer 4, and two separators 15 are provided. The first electrode assembly 11 includes a first electrode tab 111 and two first dressings 112 respectively connected to both sides of the first electrode tab 111, one side of the first electrode tab 111 is flush with the edge of the first dressing 112, and the other side thereof extends over the first dressing 112; the second electrode assembly 12 includes a second electrode sheet 121 and two second dressings 122 respectively attached to both sides of the second electrode sheet 121, and one side of the second electrode sheet 121 is flush with the edge of the second dressing 122 and the other side thereof extends through the second dressing 122.
The separator 15, the first electrode assembly 11, the separator 15, and the second electrode assembly 12 are sequentially stacked such that both sides of the separator 15 extend across both sides of the first dressing 112 and both sides of the second dressing 122, and one side of the first electrode tab 111 extending across the first dressing 112 and one side of the second electrode tab 121 extending across the second dressing 122 extend across opposite sides of the separator 15, respectively; then taking one end of the separator 15 positioned on one side of the first electrode assembly 11 opposite to the second electrode assembly 12 as a center, and winding the separator 15, the first electrode assembly 11 and the second electrode assembly 12 to form a winding core 1 with an axial cavity in the middle; the outer peripheral wall of the core 1 is then wound with an adhesive tape to fix the core 1.
Referring to fig. 4, it is noted that: when the first electrode sheet 111 is a button lithium battery positive electrode and the second electrode sheet 121 is a button lithium battery negative electrode, the first dressing 112 on the outer side of the first electrode sheet 111 in the first electrode assembly 11 is slightly short, so that after the winding core 1 is wound and formed, the first dressing 112 does not exist on the outer side of the outermost circle of the first electrode assembly 11.
Placing a gasket 6 into the first cover 2; then the winding core 1 is put into the first cover body 2, and the first electrode sheet 111 extends out of one side of the first dressing 112 and faces the bottom of the first cover body 2; then, the insulating space ring 4 is sleeved on the outer peripheral wall of the first cover body 2; then a gasket 6 is placed into the second cover 3; then the second cover body 3 is buckled on the first cover body 2 and the second cover body 3 are pressed with force; a groove for inserting the first electrode sheet 111 or the second electrode sheet 121 is formed on one side of the gasket 6 facing the winding core 1, after the button lithium battery is assembled, the part of the first electrode sheet 111 extending out of the first dressing 112 is just inserted into the groove on the gasket 6, and the part of the second electrode sheet 121 extending out of the second dressing 122 is also just inserted into the groove on the gasket 6.
This embodiment reduces the internal resistance of battery through the area of contact of the increase roll core 1 two poles of the earth and first lid 2 and second lid 3 to make the battery be difficult to generate heat at the during operation, thereby reduced the loss of battery self, improved the life-span of battery. And the peripheral wall of the first cover body 2 and the peripheral wall of the second cover body 3 are sealed by the insulating space ring 4, so that the probability of liquid leakage is greatly reduced.
Example four:
referring to fig. 5, another button lithium battery manufacturing method disclosed by the invention comprises the following steps:
The separator 15, the first electrode assembly 11, the separator 15, and the second electrode assembly 12 are sequentially stacked such that both sides of the separator 15 extend across both sides of the first dressing 112 and both sides of the second dressing 122, and one side of the first electrode tab 111 extending across the first dressing 112 and one side of the second electrode tab 121 extending across the second dressing 122 extend across opposite sides of the separator 15, respectively; then taking one end of the separator 15 positioned on one side of the first electrode assembly 11 opposite to the second electrode assembly 12 as a center, and winding the separator 15, the first electrode assembly 11 and the second electrode assembly 12 to form a winding core 1 with an axial cavity in the middle; the outer peripheral wall of the core 1 is then wound with an adhesive tape to fix the core 1.
It should be noted that in the present embodiment, the first electrode tab 111 is a positive electrode of a button lithium battery, and the second electrode tab 121 is a negative electrode of the button lithium battery. In the first electrode assembly 11, the first dressing 112 located outside the first electrode sheet 111 is slightly short, so that after the winding core 1 is wound and formed, the first dressing 112 is not arranged outside the outermost circle of the first electrode assembly 11.
Welding one end of the aluminum strip 7 on the side surface of the first electrode sheet 111 extending out of the first dressing 112, and then welding the other end of the aluminum strip 7 to the bottom of the inner side of the first cover body 2; then, the winding core 1 is placed in the first cover body 2, and the aluminum tape 7 is folded between the first cover body 2 and the winding core 1 in a Z-shaped folding mode; then, the insulating space ring 4 is sleeved on the outer peripheral wall of the first cover body 2; then, the nickel foil 8 is welded between the side surface of the second electrode sheet 121 extending over the second dressing 122 and the bottom of the inner side of the second cover 3, and then the second cover 3 is fastened to the first cover 2 and the second cover 3 are pressed together with force, and the nickel foil 8 is folded between the second cover 3 and the winding core 1 in a zigzag folding manner.
This embodiment reduces the internal resistance of battery through the area of contact of the increase roll core 1 two poles of the earth and first lid 2 and second lid 3 to make the battery be difficult to generate heat at the during operation, thereby reduced the loss of battery self, improved the life-span of battery. And the peripheral wall of the first cover body 2 and the peripheral wall of the second cover body 3 are sealed by the insulating space ring 4, so that the probability of liquid leakage is greatly reduced.
Example five:
a manufacturing method of a button lithium battery comprises the following steps:
referring to fig. 6, the method for manufacturing a button lithium battery disclosed by the invention comprises the following steps:
a first electrode assembly 11, a second electrode assembly 12, a first lid 2, a second lid 3, an insulating spacer 4, and two separators 15 are provided. The first electrode assembly 11 includes a first electrode tab 111 and two first dressings 112 respectively connected to both sides of the first electrode tab 111, one side of the first electrode tab 111 is flush with the edge of the first dressing 112, and the other side thereof extends over the first dressing 112; the second electrode assembly 12 includes a second electrode sheet 121 and two second dressings 122 respectively connected to both sides of the second electrode sheet 121, both sides of the second electrode sheet 121 are flush with both sides of the second dressings 122, and one end of the second electrode sheet 121 extends through the second dressings 122 and is fixed with a second tab 123; the first cover body 2 and the second cover body 3 are metal covers, and the outer edge of the closed end of the first cover body 2 is provided with a chamfer.
The separator 15, the first electrode assembly 11, the separator 15, and the second electrode assembly 12 are sequentially stacked such that both sides of the separator 15 extend over both sides of the first dressing 112 and both sides of the second dressing 122; taking one end, away from the second tab 123, of the separator 15, which is positioned on the side, away from the second electrode assembly 12, of the first electrode assembly 11 as the center, and winding the separator 15, the first electrode assembly 11 and the second electrode assembly 12 to form a winding core 1 with an axial cavity in the middle; bending the second tab 123 toward the axial cavity to make the second tab 123 abut against the edge of the diaphragm 15; the outer peripheral wall of the core 1 is then wound with an adhesive tape to fix the core 1.
It should be noted that in the present embodiment, the first electrode tab 111 is a positive electrode of a button lithium battery, and the second electrode tab 121 is a negative electrode of the button lithium battery. In the first electrode assembly 11, the first dressing 112 located outside the first electrode sheet 111 is slightly short, so that after the winding core 1 is wound and formed, the first dressing 112 is not arranged outside the outermost circle of the first electrode assembly 11.
Placing the winding core 1 into the first cover body 2, and enabling the first electrode sheet 111 to be in contact with the bottom wall of the inner side of the first cover body 2; then, the insulating space ring 4 is sleeved on the outer peripheral wall of the first cover body 2, then the second cover body 3 is buckled on the first cover body 2, the first cover body 2 and the second cover body 3 are pressed by force, and the second pole lug 123 is contacted with the inner side bottom wall of the second cover body 3.
When the first cover body 2 and the second cover body 3 are pressed forcibly, the chamfer angle on the first cover body 2 can press the part of the first electrode sheet 111 at the edge of the winding core 1 towards the direction of the axial cavity, so that the part of the first electrode sheet 111 at the edge of the winding core 1 is bent and deformed, and because the first electrode sheet 111 is continuous, after the part of the first electrode sheet 111 at the edge of the winding core 1 is bent and deformed, the part of the first electrode sheet 111 extending out of the first dressing 112 is bent and deformed under the compression of the first cover body 2; after the first cover body 2 and the second cover body 3 are pressed, the chamfer part of the first cover body 2 passes through the exposed part of the first electrode sheet 111 by 0.3-0.7mm to ensure that the first electrode sheet 111 and the second electrode sheet 121 are bent by a sufficient angle, so that the first electrode sheet 111 is in full contact with the first cover body 2, the contact area between the first electrode sheet 111 and the first cover body 2 is effectively increased, the internal resistance of the battery is reduced, the loss of the battery is reduced, and the service life of the battery is prolonged. And the peripheral wall of the first cover body 2 and the peripheral wall of the second cover body 3 are sealed by the insulating space ring 4, so that the probability of liquid leakage is greatly reduced.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. A manufacturing method of a button lithium battery is characterized by comprising the following steps: the method comprises the following steps:
providing a first electrode assembly (11), a second electrode assembly (12), a first cover body (2), a second cover body (3), an insulating space ring (4) and two diaphragms (15), wherein the first electrode assembly (11) comprises a first electrode plate (111) and two first dressings (112) which are respectively connected to two sides of the first electrode plate (111), one side of the first electrode plate (111) is flush with the edge of the first dressings (112), and the other side of the first electrode plate extends out of the first dressings (112); the second electrode assembly (12) comprises a second electrode sheet (121) and two second dressings (122) which are respectively connected to two sides of the second electrode sheet (121), one side of the second electrode sheet (121) is flush with the edge of the second dressing (122), and the other side of the second electrode sheet extends out of the second dressing (122);
sequentially stacking a diaphragm (15), a first electrode assembly (11), the diaphragm (15) and a second electrode assembly (12) in a stacking mode, enabling two sides of the diaphragm (15) to extend out of two sides of a first dressing (112) and two sides of a second dressing (122), and enabling one side of a first electrode plate (111) extending out of the first dressing (112) and one side of a second electrode plate (121) extending out of the second dressing (122) to respectively extend out of two opposite sides of the diaphragm (15);
taking one end of the diaphragm (15) positioned on one side of the first electrode assembly (11) opposite to the second electrode assembly (12) as a center, winding the diaphragm (15), the first electrode assembly (11) and the second electrode assembly (12) to form a winding core (1) with an axial cavity in the middle;
the winding core (1), the first cover body (2), the second cover body (3) and the insulating spacer ring (4) are assembled together, the first cover body (2) and the second cover body (3) are buckled, the insulating spacer ring (4) is located between the side wall of the first cover body (2) and the side wall of the second cover body (3), the winding core (1) is located between the first cover body (2) and the second cover body (3), the first electrode plate (111) is abutted to the bottom wall of the first cover body (2), and the second electrode plate (121) is abutted to the bottom wall of the second cover body (3).
2. The method for manufacturing a button lithium battery as claimed in claim 1, wherein the method comprises the following steps: the outer edge of the closed end of the first cover body (2) is provided with a chamfer; and a chamfer is arranged at the outer edge of the closed end of the second cover body (3).
3. The method for manufacturing a button lithium battery as claimed in claim 1, wherein the method comprises the following steps: the bottom wall of the inner side of the first cover body (2) is provided with a wave-shaped bulge (21); the bottom wall of the inner side of the second cover body (3) is also provided with a wave-shaped bulge (21); the orthographic projection of the wavy bulge (21) on the first cover body (2) on the bottom wall of the first cover body (2) is in a spiral shape; the orthographic projection of the wavy bulge (21) on the second cover body (3) on the bottom wall of the second cover body (3) is in a spiral shape.
4. The method for manufacturing a button lithium battery as claimed in claim 1, wherein the method comprises the following steps: when the winding core (1), the first cover body (2), the second cover body (3) and the insulating space ring (4) are assembled together, two gaskets (6) are also required to be placed in the first cover body (2) and the second cover body (3), and the two gaskets (6) are respectively positioned at two ends of the winding core (1); and a groove for inserting the first electrode plate (111) or the second electrode plate (121) is formed on one side of the gasket (6) facing the winding core (1).
5. The method for manufacturing a button lithium battery as claimed in claim 1, wherein the method comprises the following steps: before the winding core (1), the first cover body (2), the second cover body (3) and the insulating barrier ring are assembled together, an aluminum strip (7) is welded between the bottom wall of the inner side of the bottom of the first cover body and one side of the first electrode plate (111) extending through the first dressing (112), and a nickel foil (8) is welded between the bottom wall of the inner side of the second cover body (3) and one side of the second electrode plate (121) extending through the second dressing (122); the aluminum strip (7) is folded between the first cover body (2) and the winding core (1) in a Z-shaped folding mode; the nickel foil (8) is folded between the second cover body (3) and the winding core (1) in a Z-shaped folding mode.
6. The method for manufacturing a button lithium battery as claimed in claim 1, wherein the method comprises the following steps: after the separator (15), the first electrode assembly (11), and the second electrode assembly (12) are wound into a winding core (1), the outer peripheral wall of the winding core (1) is wound with an adhesive tape to fix the winding core (1).
7. A manufacturing method of a button lithium battery is characterized by comprising the following steps: the method comprises the following steps:
providing a first electrode assembly (11), a second electrode assembly (12), a first cover body (2), a second cover body (3), an insulating space ring (4) and two diaphragms (15), wherein the first electrode assembly (11) comprises a first electrode plate (111) and two first dressings (112) which are respectively connected to two sides of the first electrode plate (111), one side of the first electrode plate (111) is flush with the edge of the first dressings (112), and the other side of the first electrode plate extends out of the first dressings (112); the second electrode assembly (12) comprises a second electrode plate (121) and two second dressings (122) which are respectively connected to two sides of the second electrode plate (121), two sides of the second electrode plate (121) are flush with two sides of the second dressings (122), one end of the second electrode plate (121) extends through the second dressings (122) and is fixed with a second tab (123);
sequentially stacking a diaphragm (15), a first electrode assembly (11), a diaphragm (15) and a second electrode assembly (12) so that two sides of the diaphragm (15) extend out of two sides of a first dressing (112) and two sides of a second dressing (122); taking one end of the diaphragm (15) positioned on one side of the first electrode assembly (11) opposite to the second electrode assembly (12) as a center, winding the diaphragm (15), the first electrode assembly (11) and the second electrode assembly (12) to form a winding core (1) with an axial cavity in the middle; bending the second pole lug (123) towards the direction of the axial cavity, so that the second pole lug (123) is attached to the edge of the diaphragm (15);
the winding core (1), the first cover body (2), the second cover body (3) and the insulating spacer ring (4) are assembled together, the first cover body (2) and the second cover body (3) are buckled, the insulating spacer ring (4) is located between the side wall of the first cover body (2) and the side wall of the second cover body (3), the winding core (1) is located between the first cover body (2) and the second cover body (3), the first electrode plate (111) is abutted to the bottom wall of the first cover body (2), and the second electrode tab (123) is welded to the bottom wall of the second cover body (3).
8. The method for manufacturing a button lithium battery as claimed in claim 7, wherein the method comprises the following steps: the outer edge of the closed end of the first cover body (2) is provided with a chamfer.
9. The method for manufacturing a button lithium battery as claimed in claim 7, wherein the method comprises the following steps: after the separator (15), the first electrode assembly (11), and the second electrode assembly (12) are wound into a winding core (1), the outer peripheral wall of the winding core (1) is wound with an adhesive tape to fix the winding core (1).
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| CN202010275492.0A CN111313077A (en) | 2020-04-09 | 2020-04-09 | Manufacturing method of button lithium battery |
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| CN202010275492.0A CN111313077A (en) | 2020-04-09 | 2020-04-09 | Manufacturing method of button lithium battery |
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Cited By (1)
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|---|---|---|---|---|
| EP4080632A4 (en) * | 2020-09-18 | 2023-08-09 | LG Energy Solution, Ltd. | Button-type secondary battery |
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