CN113131103A - Circular tab and button cell - Google Patents
Circular tab and button cell Download PDFInfo
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- CN113131103A CN113131103A CN202110379645.0A CN202110379645A CN113131103A CN 113131103 A CN113131103 A CN 113131103A CN 202110379645 A CN202110379645 A CN 202110379645A CN 113131103 A CN113131103 A CN 113131103A
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- Prior art keywords
- steel shell
- cover plate
- bonding sheet
- battery
- insulating bonding
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- 229920002379 silicone rubber Polymers 0.000 claims abstract description 130
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 88
- 239000010959 steel Substances 0.000 claims abstract description 88
- 239000000945 filler Substances 0.000 claims abstract description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 98
- 239000004945 silicone rubber Substances 0.000 claims description 73
- 239000006229 carbon black Substances 0.000 claims description 37
- -1 methyl vinyl phenyl Chemical group 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 19
- 239000010453 quartz Substances 0.000 claims description 19
- 229910021485 fumed silica Inorganic materials 0.000 claims description 11
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 11
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000007822 coupling agent Substances 0.000 claims description 8
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 7
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical group C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 7
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 7
- 239000004014 plasticizer Substances 0.000 claims description 7
- HIHIPCDUFKZOSL-UHFFFAOYSA-N ethenyl(methyl)silicon Chemical compound C[Si]C=C HIHIPCDUFKZOSL-UHFFFAOYSA-N 0.000 claims description 6
- 125000005498 phthalate group Chemical group 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 17
- 238000010345 tape casting Methods 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 description 68
- 239000000853 adhesive Substances 0.000 description 65
- 229910002027 silica gel Inorganic materials 0.000 description 25
- 239000000741 silica gel Substances 0.000 description 25
- 235000012239 silicon dioxide Nutrition 0.000 description 19
- 230000002829 reductive effect Effects 0.000 description 17
- 239000002344 surface layer Substances 0.000 description 13
- 239000000126 substance Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 10
- 230000005855 radiation Effects 0.000 description 10
- 230000001965 increasing effect Effects 0.000 description 8
- 238000007766 curtain coating Methods 0.000 description 6
- 230000000704 physical effect Effects 0.000 description 6
- 229910010272 inorganic material Inorganic materials 0.000 description 5
- 239000011147 inorganic material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011368 organic material Substances 0.000 description 4
- 238000004073 vulcanization Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 125000000524 functional group Chemical group 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000002679 ablation Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 230000003301 hydrolyzing effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000010415 colloidal nanoparticle Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- NYMPGSQKHIOWIO-UHFFFAOYSA-N hydroxy(diphenyl)silicon Chemical group C=1C=CC=CC=1[Si](O)C1=CC=CC=C1 NYMPGSQKHIOWIO-UHFFFAOYSA-N 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010092 rubber production Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application provides a circular lug and a button cell. The circular tab comprises: the battery steel shell comprises a steel shell cover plate, an insulating bonding sheet and an electrode lug piece which are sequentially connected in a stacked mode, wherein the steel shell cover plate is used for covering a battery steel shell, the electrode lug piece and the insulating bonding sheet are both positioned on one side, far away from the battery steel shell, of the steel shell cover plate, the insulating bonding sheet comprises silicon rubber and a filler, and the mass fraction of the filler in the insulating bonding sheet is 37% -52%. When the steel shell cover plate is welded with the battery steel shell, part of silicon rubber molecular connecting chains are broken at high temperature, but because the silicon rubber is of a reticular molecular connecting structure, a large number of interconnected molecular chains still exist, namely, the silicon rubber can still well maintain the molecular structure of the silicon rubber, macroscopically, the insulating bonding sheet is softened when being heated, but the tape casting is not generated, the failure of the insulating bonding sheet caused by the welding of the steel shell cover plate can be avoided, and the bonding sheet is further ensured to have better bonding performance after the welding of the steel shell cover plate.
Description
Technical Field
The invention relates to the technical field of button cells, in particular to a circular lug and a button cell.
Background
The traditional button cell mainly comprises two types, one type is a steel shell button cell with an upper steel shell and a lower steel shell which are mutually buckled, and the other type is a soft package button cell. For a steel shell button cell, the problems that a tab of a soft package button cell is easy to break and the shape stability is low are solved, but the side wall of the steel shell button cell is formed by overlapping an upper steel shell, a lower steel shell and an insulating ring, so that the energy density of the cell is reduced due to the large thickness of the side wall of the steel shell button cell; in addition, when the temperature inside the battery rises and expands due to accidental short circuit, the steel shell button battery is difficult to complete pressure relief due to mechanical buckling connection, and the battery is easy to explode.
In order to solve the problem that steel-casing button cell's energy density is low and be difficult to the pressure release, a neotype steel-casing button cell has appeared on the market, this steel-casing button cell includes upper cover and casing, the upper cover is utmost point auricle, insulating bonding piece and the range upon range of bonding of apron constitute, through welding the apron in the opening of casing in order to realize being connected of upper cover and casing, however, weld the apron in casing open-ended process, because the insulating bonding piece on the apron is nearer apart from the welding position, when welding the apron, the insulating bonding piece receives the softening of being heated after the welded high temperature influences, make the insulating bonding piece take place deformation or even curtain coating, and then the bonding that leads to insulating bonding piece is inefficacy.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a circular tab and a button cell which can keep stable shape, good bonding force and high safety when being heated.
The purpose of the invention is realized by the following technical scheme:
a circular tab comprising: the battery steel shell comprises a steel shell cover plate, an insulating bonding sheet and an electrode lug piece which are sequentially connected in a stacked mode, wherein the steel shell cover plate is used for covering a battery steel shell, the electrode lug piece and the insulating bonding sheet are both positioned on one side, far away from the battery steel shell, of the steel shell cover plate, the insulating bonding sheet comprises silicon rubber and a filler, and the mass fraction of the filler in the insulating bonding sheet is 37% -52%.
In one embodiment, the filler comprises the following components in parts by mass:
65-80 parts of white carbon black;
15-20 parts of quartz powder.
In one embodiment, the white carbon black comprises the following components in parts by mass:
40-50 parts of fumed silica;
25 to 30 portions of precipitated white carbon black.
In one embodiment, the silicone rubber comprises the following components in parts by mass:
in one embodiment, the raw silica gel comprises the following components in parts by mass:
55-60 parts of methyl vinyl silicone rubber;
40-50 parts of methyl vinyl phenyl silicone rubber.
In one embodiment, the methyl vinyl phenyl silicone rubber has a phenyl mole fraction of 0.15mol to 0.25 mol.
In one embodiment, the vulcanizing agent is benzoyl peroxide.
In one embodiment, the coupling agent is a silane coupling agent.
In one of the embodiments, the plasticizer is a phthalate.
The utility model provides a button cell, includes battery box hat, battery roll core and any embodiment of the aforesaid circular utmost point ear, the holding chamber and the opening of mutual intercommunication are seted up to the battery box hat, the box hat apron lid is located the opening, the battery rolls up the core body and rolls up the core utmost point ear that the core includes interconnect, roll up the core body set up in the holding chamber, first through-hole has been seted up to the box hat apron, the second through-hole has been seted up to the insulating bonding piece, utmost point auricle with wear to locate in proper order the second through-hole reaches first through-hole roll core utmost point ear connects.
Compared with the prior art, the invention has at least the following advantages:
1. the silicon rubber is a vulcanized high molecular compound, long chain structures of the silicon rubber are mutually stacked and mutually cross-linked to form a stable reticular molecular connecting structure, when the steel shell cover plate and the battery steel shell are welded, the insulating bonding sheet is heated, partial silicon rubber molecular connecting chains are broken at high temperature, but because the silicon rubber is a reticular molecular connection structure, each silicon rubber molecule is simultaneously connected with a plurality of silicon rubber molecules, even if part of the molecular connecting chains are broken, a large number of interconnected molecular chains still exist, namely, the silicon rubber can still better maintain the molecular structure of the silicon rubber and macroscopically shows that the insulating adhesive sheet is softened when being heated, but can keep self stable in structure, do not take place deformation and curtain coating, can avoid the insulating bonding piece that the welding of steel-shell cover plate leads to lose efficacy, and then guarantee that the bonding piece still has better adhesive property after the welding of steel-shell cover plate.
2. The higher filling ratio can reduce the content of the silicon rubber molecules in the insulating bonding sheet, so that the number of the silicon rubber molecules on the surface layer of the insulating bonding sheet is reduced, and further the initial adhesion of the insulating bonding sheet is reasonably reduced, in addition, when the insulating bonding sheet is heated and expanded in a steel shell, because the number of the silicon rubber molecules on the surface layer of the insulating bonding sheet is less, when a battery is in short circuit, the increase of the temperature in a battery cavity can break silicon rubber molecular chains on the surface of the insulating bonding sheet, so that the surface layer of the insulating bonding sheet slightly deforms, the bonding force of the insulating bonding sheet is reduced, and the initial bonding force of the insulating bonding sheet is reasonably reduced, so that the insulating bonding sheet can rapidly lose the viscosity when the battery is in short circuit, and further the sensitivity of the insulating bonding sheet to high temperature and expansion generated when the battery is in short circuit and other accidents occur can be improved, the insulating bonding sheet or the steel shell cover plate can be ejected when the temperature in the steel shell is low and the expansion degree is low, so that the situation that the battery cannot be exploded due to the fact that the insulating bonding sheet or the steel shell cover plate cannot be ejected when the temperature of the battery is too high or the expansion degree is too high and the battery cannot be decompressed is avoided, and the use safety of the battery is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural view of a circular tab in an embodiment;
fig. 2 is an exploded view of the circular tab shown in fig. 1;
fig. 3 is a schematic structural diagram of a button cell battery in an embodiment;
fig. 4 is an exploded view of the button cell shown in fig. 3.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 and fig. 2, a circular tab 10 of an embodiment includes a steel case cover plate 100, an insulating adhesive sheet 200, and a tab sheet 300, which are sequentially stacked and connected, where the steel case cover plate 100 is used to cover a battery steel case, the tab sheet 300 and the insulating adhesive sheet 200 are both located on a side of the steel case cover plate 100 away from the battery steel case, the insulating adhesive sheet 200 includes silicon rubber and a filler, and a mass fraction of the filler in the insulating adhesive sheet 200 is 37% to 52%.
In this embodiment, the circular tab 10 includes a steel shell cover plate 100, an insulating adhesive sheet 200 and a tab sheet 300, the steel shell cover plate 100, the insulating adhesive sheet 200 and the tab sheet 300 are sequentially stacked and connected, the steel shell cover plate 100 is used for covering and welding on an opening of a battery steel shell, the insulating adhesive sheet 200 and the tab sheet 300 are both located on one side of the steel shell cover plate 100 away from the battery steel shell, the insulating adhesive sheet 200 is used for respectively bonding the steel shell cover plate 100 and the tab sheet 300 and isolating the steel shell cover plate 100 and the tab sheet 300 to prevent the two from short circuit due to contact, specifically, by sequentially stacking the steel shell cover plate 100, the insulating adhesive sheet 200 and the tab sheet 300 and performing hot-pressing operation on the three, the insulating adhesive sheet 200 is heated to generate viscosity, so that the steel shell cover plate 100 and the tab sheet 300 are respectively bonded on two side faces of the insulating adhesive sheet 200. The steel shell cover plate 100 and the insulating bonding sheet 200 are both provided with intercommunicating pores, and the coiled core electrode lug is welded with the electrode lug sheet 300 through the intercommunicating pores.
Further, the insulating adhesive sheet 200 includes silicon rubber and a filler, and the mass fraction of the filler in the insulating adhesive sheet 200 is 37% to 52%. The bonding effect of the insulating bonding sheet 200 is realized through silicon rubber, the insulating bonding sheet 200 is respectively hot-pressed with the steel shell cover plate 100 and the pole lug plate 300, molecules of the heated silicon rubber actively rise, and under the action of pressure, the distance between the silicon rubber molecules on the surface layer of the insulating bonding sheet 200 and the surface molecules of the steel shell cover plate 100 and the pole lug plate 300 is reduced, so that the silicon rubber molecules on the surface layer of the insulating bonding sheet 200 and the surface molecules of the steel shell cover plate 100 and the pole lug plate 300 generate stronger molecular connection acting force, and the steel shell cover plate 100 and the pole lug plate 300 are bonded on two sides of the insulating bonding sheet 200. The silicon rubber is a vulcanized high molecular compound, long chain structures of the silicon rubber are mutually stacked and mutually cross-linked to form a stable reticular molecular connecting structure, when the steel shell cover plate 100 is welded with the battery steel shell, the insulating adhesive sheet 200 is heated, and a part of the silicon rubber molecular connecting chains are broken by the high temperature, but because the silicon rubber is a reticular molecular connection structure, each silicon rubber molecule is simultaneously connected with a plurality of silicon rubber molecules, even if a part of the molecular connecting chains are broken, a large number of interconnected molecular chains still exist, i.e., the silicone rubber can still well maintain its own molecular structure, macroscopically expressed as softening of the insulating adhesive sheet 200 when heated, but can keep self stable in structure, do not take place deformation and curtain coating, can avoid the insulating bonding sheet 200 that the welding of steel-shell cover plate 100 leads to become invalid, and then guarantee that the bonding sheet has better adhesive property.
Further, the mass fraction of the filler in the insulating adhesive sheet 200 is 37% to 52%. The filler is mainly composed of a silicate compound, and has stable chemical and physical properties, and the high filler content ratio can dilute the mass of the silicone rubber in the insulating adhesive sheet 200, and is stable in physical properties. Higher filler accounts for than helps increasing insulating bonding sheet 200's compact degree for insulating bonding sheet 200's structural stability obtains improving, can avoid the insulating bonding sheet 200 that high temperature radiation leads to become invalid when the welding of box hat apron 100, and then guarantees that the bonding sheet has better bonding property. Meanwhile, in the present embodiment, the insulating adhesive sheet 200 not only can maintain its shape under high temperature radiation of welding, but also can reasonably control the tack-free temperature, specifically, a higher filler ratio will reduce the content of silicone rubber molecules in the insulating adhesive sheet 200, so that the number of silicone rubber molecules on the surface layer of the insulating adhesive sheet 200 is reduced, and further the initial adhesion of the insulating adhesive sheet 200 is reasonably reduced, and in addition, when the insulating adhesive sheet 200 is heated and expanded inside a steel can, because the number of silicone rubber molecules on the surface layer of the insulating adhesive sheet 200 is smaller, when a battery is short-circuited, the rise of the temperature inside the battery cavity can break the silicone rubber molecular chains on the surface of the insulating adhesive sheet 200, so that the surface layer of the insulating adhesive sheet 200 slightly deforms, and the adhesion of the insulating adhesive sheet 200 is reduced, and in addition, the initial adhesion of the insulating adhesive sheet 200 is reasonably reduced, make insulating bonding piece 200 can lose viscidity fast when the battery short circuit, and then can improve the high temperature that insulating bonding piece 200 produced when accident such as short circuit takes place to the battery and the sensitive degree of inflation, make insulating bonding piece 200 or box hat apron 100 can be ejecting when the box hat internal temperature is lower and the inflation degree is lower, and then prevent that insulating bonding piece 200 or box hat apron 100 still can't be ejecting when battery temperature is too high or the inflation degree is too high, lead to the unable pressure release of battery and the condition of blasting, the safety in utilization of battery has further been improved.
In one embodiment, the filler comprises the following components in parts by mass: 65-80 parts of white carbon black; 15-20 parts of quartz powder. In this embodiment, the white carbon black is a generic name of white powdery X-ray amorphous silicic acid and silicate products, mainly referring to precipitated silica, fumed silica, and ultrafine silica gel, and also including powdery synthetic aluminum silicate, calcium silicate, and the like, in this embodiment, the white carbon black specifically refers to precipitated silica or fumed silica, and the white carbon black has a large surface area due to its small particle diameter, so that it has a good adsorption capacity and can be better fused with silicone rubber, and the silica has good chemical and physical stability, and can increase the consistency of silicone rubber and reduce the softening degree of silicone rubber after being fused with silicone rubber, so that the structural stability of silicone rubber is increased, that is, the mechanical properties of silicone rubber are effectively improved, and further when the insulating adhesive sheet 200 is subjected to high temperature radiated by a welding cover plate, although the insulating adhesive sheet 200 is softened to a certain degree, the structural stability of the insulating adhesive sheet 200 can be maintained well, and deformation and flow casting are not generated, so that the cooled insulating adhesive sheet 200 can maintain the bonding effect on the cover plate and the tab sheet 300 well. The through hole communicated with the battery steel shell cavity is formed in the insulating bonding sheet 200, so that the wall of the through hole of the insulating bonding sheet 200 is directly contacted with the electrolyte in the steel shell, and the white carbon black has good chemical stability and can increase the chemical corrosion resistance of the insulating bonding sheet 200 after being fused with the silicon rubber, so that the effect of prolonging the service life of the insulating bonding sheet 200 is achieved. The main effect of quartz powder is as the reinforcement filler, the molecular structure of quartz powder is more stable, make it have better high temperature resistance, the high temperature resistance ability of silicon rubber can be improved in the addition of quartz powder, make insulating bonding sheet when suffering the radiating high temperature of welded cover board, the stable in structure who maintains self that can be better, avoid insulating bonding sheet 200 to be heated and soften the deformation, and it is that quartz powder is a hard, wear-resisting and the stable silicate mineral of chemical property, the insulating nature and the anti external force performance of insulating bonding sheet 200 can further be improved in the addition of quartz powder, and then promote insulating bonding sheet 200's reliability and life. After quartz powder molecule, white carbon molecule and silicon rubber molecule are stirred and mixed, a plurality of linear molecular structures in the silicon rubber will be cross-linked each other, form netted cross-linked structure, simultaneously silicon rubber molecule still will form the covalent bond with quartz powder molecule and white carbon molecule simultaneously, the three forms three-dimensional netted interconnected structure jointly, promote the toughness of this insulating bonding piece 200 effectively, when insulating bonding piece 200 receives welded high temperature radiation, a plurality of covalent bond connections of its inside three-dimensional netted interconnected structure not only have higher joint strength, and share external energy each other between a plurality of covalent bonds, play the effect of increasing overall structure stability, and then make the insulating self shape that can be better maintained, prevent thermal deformation or curtain coating. In addition, when external force is applied, since the three-dimensional mesh interconnection structure has many connection points, when external force is applied to a certain point, the external force can be better distributed to the connection structure of each molecule, thereby improving the external force resistance of the insulating adhesive sheet 200.
In one embodiment, the white carbon black comprises the following components in parts by mass: 40-50 parts of fumed silica; 25 to 30 portions of precipitated white carbon black. The white carbon black is mainly divided into precipitated white carbon black and gas-phase white carbon black according to the production method, and the products obtained by production are the precipitated white carbon black and the gas-phase white carbon black respectively. In this embodiment, the white carbon black is formed by mixing fumed silica and precipitated white carbon black, fumed silica is white amorphous flocculent semi-transparent solid colloidal nano particles in a normal state, and has a huge specific surface area, so that the fumed silica has a better adsorption capacity, the mixing and melting uniformity of the white carbon black and the silicone rubber can be enhanced, and after the precipitated white carbon black and the silicone rubber are mixed and melted, the precipitated white carbon black is larger than the fumed silica due to the fact that the particle diameter of the precipitated white carbon black is larger than that of the fumed silica, the viscosity of the silicone rubber can be improved after the precipitated white carbon black and the silicone rubber are mixed and melted, namely, the mixed white carbon black through the fumed silica and the precipitated white carbon black can not only improve the viscosity of the silicone rubber, but also enable the white carbon black.
In one embodiment, the silicone rubber comprises the following components in parts by mass: 90-100 parts of raw silica gel; 1-1.5 parts of a coupling agent; 1.5-3 parts of a vulcanizing agent; 2-3 parts of a plasticizer; 0.5 to 1 part of anti-aging agent. In this embodiment, the silicon rubber is under the effect of vulcanizing agent, can make the linear silica gel molecule connection structure in the silicon rubber take place deformation, linear silica gel molecule connection structure overlaps each other and connects, finally form the silica gel molecule connection structure of netted interweaving, even make each silica gel intermolecular interconnect, every silica gel molecule is simultaneously and a plurality of silica gel molecule intercoupling, so can effectively increase the holistic structural stability of silica gel, make this insulating bonding piece 200 can keep better stability after bonding apron and utmost point ear piece 300, and then maintain better bonding stability. The silicon rubber is a multi-molecule polymerized organic matter, the white carbon black and the quartz powder belong to inorganic matters, the inorganic matter molecules and the organic matter molecules are generally difficult to be fully fused to form chemical bonds, so that the stability of molecular groups formed by the silicon rubber, the white carbon black and the quartz powder is poor, more silicon rubber, white carbon black and quartz powder molecules are still connected with the chemical bonds, the organic silicon monomer with more than two different reaction groups in the coupling agent molecule can be chemically bonded with the organic material and the inorganic material, namely, the coupling agent molecule has two important functional groups, one of which is the functional group of the organophilic material, the other is the functional group of the organophilic material, the coupling agent can respectively react with free silicon rubber molecules, white carbon black molecules and quartz powder molecules, so that the silicon rubber molecules, the white carbon black molecules and the quartz powder molecules are indirectly connected through the coupling agent to form a molecular connection structure, not only fully utilized free material molecule, still improved the density that insulating bonding sheet 200's inside chemical bond connects simultaneously, further improved the toughness and the structural stability of insulating bonding sheet 200 for insulating bonding sheet 200 has better structural stability when suffering welded high temperature radiation, reduces insulating bonding sheet 200's softening degree effectively, avoids insulating bonding sheet 200 to be heated the curtain coating. The raw silica gel is a main component for preparing the silicon rubber, the raw silica gel has poor toughness and low elasticity, so that the plasticity of the raw silica gel is poor, and the plasticizer mainly has the functions of weakening the secondary valence bonds among silica gel molecules, increasing the mobility of the silica gel molecular bonds, reducing the crystallinity of the silica gel molecules, increasing the plasticity of the silica gel molecules, enhancing the flexibility of the silica gel molecules and being easy to process. The anti-aging agent has the effects of resisting thermal oxidation aging, resisting ozone aging, inhibiting harmful metal ions, resisting fatigue, resisting ultraviolet radiation and the like, can effectively prolong the service life of the insulating bonding sheet 200, enables the upper cover of the battery to have higher reliability, and further improves the durability of the battery.
In one embodiment, the raw silica gel comprises the following components in parts by mass: 55-60 parts of methyl vinyl silicone rubber; 40-50 parts of methyl vinyl phenyl silicone rubber. In the present embodiment, the methyl vinyl silicone rubber is copolymerized from dimethylsiloxane and a small amount of vinyl siloxane, and in the production of silicone rubber, the methyl vinyl silicone rubber has the largest yield and the widest application, and as a raw material of silicone rubber, the production cost of the insulating adhesive sheet 200 can be reduced. Methyl vinyl phenyl silicone rubber is prepared by introducing diphenyl siloxane chain links into a molecular chain of vinyl silicone rubber, and the regularity of a dimethyl siloxane structure is destroyed by introducing large-volume phenyl, so that the crystallization temperature and the glass transition temperature of a polymer are reduced, namely the high temperature resistance and the low temperature resistance of the silicone rubber are improved, the applicable temperature range of the silicone rubber is further increased, and the insulating adhesive sheet 200 can work in a severe temperature environment for a long time. The silicone rubber of the embodiment is formed by mixing methyl vinyl silicone rubber and methyl vinyl phenyl silicone rubber, and the temperature adaptability of the silicone rubber can be improved on the basis of reducing the production cost of the silicone rubber, so that the silicone rubber has both economy and functionality.
In one embodiment, the methyl vinyl phenyl silicone rubber has a phenyl mole fraction of 0.15mol to 0.25 mol. With the increase of the phenyl mole fraction, the rigidity of the molecular chain of the silicone rubber is increased, and when the phenyl mole fraction of the methyl vinyl phenyl silicone rubber is 0.15mol to 0.25mol, the methyl vinyl phenyl silicone rubber is collectively referred to as the middle phenyl silicone rubber, because the methyl vinyl phenyl silicone rubber has good molecular chain rigidity, the middle phenyl silicone rubber has good radiation resistance, so that the ablation resistance and the heat insulation capability of the insulating adhesive sheet 200 are effectively improved, the insulating adhesive sheet 200 can effectively resist high-temperature radiation generated during cover plate welding, and the good heat insulation capability can block heat from acting on the pole lug 300, so as to protect the pole lug 300 from the influence of the high-temperature radiation, and fully ensure the reliability of the electrical connection of the pole lug 300. When the phenyl mole fraction of the methylvinyl phenyl silicone rubber is more than 0.30mol, the methylvinyl phenyl silicone rubber is generally called as high phenyl silicone rubber, although the methylvinyl phenyl silicone rubber has higher molecular chain rigidity, the physical properties of the methylvinyl phenyl silicone rubber are poorer, the processing of the methylvinyl phenyl silicone rubber is difficult, and the production and the application of the methylphenyl phenyl silicone rubber are more limited, because the methylvinyl phenyl silicone rubber with the phenyl mole fraction of 0.15 mol-0.25 mol has better ablation resistance and heat insulation capability, the raw rubber production of the silicone rubber can be facilitated, and the production efficiency of the insulating adhesive sheet 200 can be improved.
In one embodiment, the vulcanizing agent is benzoyl peroxide. In this embodiment, benzoyl peroxide reacts with silicone rubber, so that the linear silicone rubber molecular connection structure in the silicone rubber moves and is cross-linked with each other, and a plurality of linear silicone rubber molecular structures form a reticular silicone rubber molecular connection structure after being cross-linked with each other, so that the mechanical strength of the silicone rubber is remarkably improved. In addition, the benzoyl peroxide is easy to decompose in the pre-vulcanization process, can provide sufficient sulfur to convert metal oxides in the catalyst into metal sulfides, and compared with inorganic vulcanizing agents such as sulfur or hydrogen sulfide, the benzoyl peroxide can reduce the breakage rate of the catalyst, improve the vulcanization degree and activity of the catalyst, enable the vulcanization process to be quicker and more complete, and meanwhile, the benzoyl peroxide has the advantage of being difficult to volatilize at room temperature and is beneficial to improving the safety in vulcanization processing.
In one embodiment, the coupling agent is a silane coupling agent. The insulating bonding sheet 200 contains inorganic materials such as quartz powder and white carbon black, the silicone rubber is an organic material, the organic material is difficult to be mixed and melted with the inorganic material, the introduction of the silane coupling agent can improve the reaction degree between the silicone rubber and the quartz powder and the white carbon black, and the silane coupling agent can effectively bond silicon rubber molecules with quartz powder molecules and white carbon black molecules. The silane coupling agent contains non-hydrolytic groups, namely organic groups and hydrolytic groups, and due to the special structure, the silane coupling agent can act on the interface of an inorganic material and an organic material, combines or couples two completely different materials, effectively enhances the affinity action between an organic matter and an inorganic compound, and silicon rubber molecules can more quickly form chemical bonds with quartz powder molecules and white carbon black molecules. In addition, the silane coupling agent can enhance the physicochemical properties of the insulating adhesive sheet 200, such as strength, toughness, electrical properties, water resistance, and corrosion resistance.
In one of the embodiments, the plasticizer is a phthalate. The plasticizer can reduce the intermolecular acting force of the silica gel, so that the silica gel has plasticity and fluidity to facilitate processing of the silica gel, and can improve certain physical properties of the silica gel, such as reduction of hardness and stress at definite elongation, giving the silica gel higher elasticity and lower heat generation, and improving the cold resistance of the silica gel. In this embodiment, the plasticizer is specifically phthalate, which has the advantages of good compatibility, wide applicability, stable chemical properties, simple production process, cheap and easily available raw materials, low cost, and the like, and can achieve the effects of reducing the production cost of the insulating adhesive sheet 200 and optimizing the production process of the insulating adhesive sheet 200.
As shown in fig. 3 and 4, the present application further provides a button cell, including battery steel casing 400, battery roll core 500 and any of the above embodiments circular utmost point ear 10, battery steel casing 400 sets up holding chamber and opening of mutual intercommunication, steel casing apron 100 lid is located the opening, battery roll core 500 includes interconnect's book core body 510 and book core utmost point ear 520, roll core body 510 set up in the holding chamber, first through-hole 110 has been seted up to steel casing apron 100, second through-hole 210 has been seted up to insulating bonding piece 200, utmost point auricle 300 with wear to locate in proper order second through-hole 210 reaches first through-hole 110 roll core utmost point ear 520 connects.
In this embodiment, the circular tab 10 includes a steel shell cover plate 100, an insulating adhesive sheet 200 and a tab sheet 300, the steel shell cover plate 100, the insulating adhesive sheet 200 and the tab sheet 300 are sequentially stacked and connected, the steel shell cover plate 100 is used for covering and welding on an opening of a battery steel shell 400, the insulating adhesive sheet 200 and the tab sheet 300 are both located on one side of the steel shell cover plate 100 away from the battery steel shell 400, the insulating adhesive sheet 200 is used for respectively bonding the steel shell cover plate 100 and the tab sheet 300, and isolating the steel shell cover plate 100 and the tab sheet 300 to prevent short circuit caused by contact of the two, specifically, by sequentially stacking the steel shell cover plate 100, the insulating adhesive sheet 200 and the tab sheet 300 and performing hot-pressing operation on the three, the insulating adhesive sheet 200 is heated to generate viscosity, so that the steel shell cover plate 100 and the tab sheet 300 are respectively bonded on two side faces of the insulating adhesive sheet 200. The steel shell cover plate 100 and the insulating adhesive sheet 200 are both provided with communication holes, and the roll core tab 520 is welded with the tab sheet 300 through the communication holes.
Further, the insulating adhesive sheet 200 includes silicon rubber and a filler, and the mass fraction of the filler in the insulating adhesive sheet 200 is 37% to 52%. The bonding effect of the insulating bonding sheet 200 is realized through silicon rubber, the insulating bonding sheet 200 is respectively hot-pressed with the steel shell cover plate 100 and the pole lug plate 300, molecules of the heated silicon rubber actively rise, and under the action of pressure, the distance between the silicon rubber molecules on the surface layer of the insulating bonding sheet 200 and the surface molecules of the steel shell cover plate 100 and the pole lug plate 300 is reduced, so that the silicon rubber molecules on the surface layer of the insulating bonding sheet 200 and the surface molecules of the steel shell cover plate 100 and the pole lug plate 300 generate stronger molecular connection acting force, and the steel shell cover plate 100 and the pole lug plate 300 are bonded on two sides of the insulating bonding sheet 200. The silicon rubber is a vulcanized high molecular compound, long chain structures of the silicon rubber are mutually stacked and mutually cross-linked to form a stable reticular molecular connecting structure, when the steel shell cover plate 100 and the battery steel shell 400 are welded, the insulating adhesive sheet 200 is heated, and a part of the silicon rubber molecular connecting chains are broken by the high temperature, but because the silicon rubber is a reticular molecular connection structure, each silicon rubber molecule is simultaneously connected with a plurality of silicon rubber molecules, even if a part of the molecular connecting chains are broken, a large number of interconnected molecular chains still exist, i.e., the silicone rubber can still well maintain its own molecular structure, macroscopically expressed as softening of the insulating adhesive sheet 200 when heated, but can keep self stable in structure, do not take place deformation and curtain coating, can avoid the insulating bonding sheet 200 that the welding of steel-shell cover plate 100 leads to become invalid, and then guarantee that the bonding sheet has better adhesive property.
Further, the mass fraction of the filler in the insulating adhesive sheet 200 is 37% to 52%. The filler is mainly composed of a silicate compound, and has stable chemical and physical properties, and the high filler content ratio can dilute the mass of the silicone rubber in the insulating adhesive sheet 200, and is stable in physical properties. Higher filler accounts for than helps increasing insulating bonding sheet 200's compact degree for insulating bonding sheet 200's structural stability obtains improving, can avoid the insulating bonding sheet 200 that high temperature radiation leads to become invalid when the welding of box hat apron 100, and then guarantees that the bonding sheet has better bonding property. Meanwhile, in the present embodiment, the insulating adhesive sheet 200 not only can maintain its shape under high temperature radiation of welding, but also can reasonably control the tack-free temperature, specifically, a higher filler ratio will reduce the content of silicone rubber molecules in the insulating adhesive sheet 200, so that the number of silicone rubber molecules on the surface layer of the insulating adhesive sheet 200 is reduced, and further the initial adhesion of the insulating adhesive sheet 200 is reasonably reduced, and in addition, when the insulating adhesive sheet 200 is heated and expanded inside a steel can, because the number of silicone rubber molecules on the surface layer of the insulating adhesive sheet 200 is smaller, when a battery is short-circuited, the rise of the temperature inside the battery cavity can break the silicone rubber molecular chains on the surface of the insulating adhesive sheet 200, so that the surface layer of the insulating adhesive sheet 200 slightly deforms, and the adhesion of the insulating adhesive sheet 200 is reduced, and in addition, the initial adhesion of the insulating adhesive sheet 200 is reasonably reduced, make insulating bonding piece 200 can lose viscidity fast when the battery short circuit, and then can improve the high temperature that insulating bonding piece 200 produced when accident such as short circuit takes place to the battery and the sensitive degree of inflation, make insulating bonding piece 200 or box hat apron 100 can be ejecting when the box hat internal temperature is lower and the inflation degree is lower, and then prevent that insulating bonding piece 200 or box hat apron 100 still can't be ejecting when battery temperature is too high or the inflation degree is too high, lead to the unable pressure release of battery and the condition of blasting, the safety in utilization of battery has further been improved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A circular tab, comprising: the battery steel shell comprises a steel shell cover plate, an insulating bonding sheet and an electrode lug plate which are sequentially connected in a stacked mode, wherein the steel shell cover plate is used for covering and arranging the battery steel shell, the electrode lug plate and the insulating bonding sheet are located on one side, far away from the battery steel shell, of the steel shell cover plate, the insulating bonding sheet comprises silicon rubber and a filler, and the mass fraction of the filler in the insulating bonding sheet is 37% -52%.
2. The circular tab as claimed in claim 1, wherein the filler comprises the following components in parts by mass:
65-80 parts of white carbon black;
15-20 parts of quartz powder.
3. The circular tab of claim 2, wherein the white carbon black comprises the following components in parts by mass:
40-50 parts of fumed silica;
25 to 30 portions of precipitated white carbon black.
4. The circular tab as claimed in claim 1, wherein the silicone rubber comprises the following components in parts by mass:
5. the circular tab as claimed in claim 4, wherein the raw silicone rubber comprises the following components in parts by mass:
55-60 parts of methyl vinyl silicone rubber;
40-50 parts of methyl vinyl phenyl silicone rubber.
6. The circular tab as claimed in claim 5, wherein the methyl vinyl phenyl silicone rubber has a phenyl mole fraction of 0.15 to 0.25 mol.
7. The circular tab as claimed in claim 4, wherein the vulcanizing agent is benzoyl peroxide.
8. The circular tab as claimed in claim 4, wherein the coupling agent is a silane coupling agent.
9. The circular tab as claimed in claim 4, wherein the plasticizer is phthalate.
10. The utility model provides a button cell, its characterized in that, include battery steel casing, battery roll core and any one in claims 1 to 9 circular utmost point ear, the holding chamber and the opening of mutual intercommunication are seted up to the battery steel casing, steel casing apron lid is located the opening, the battery rolls up the core body and rolls up the core utmost point ear including interconnect, roll up the core body set up in the holding chamber, first through-hole has been seted up to the steel casing apron, the second through-hole has been seted up to the insulating bonding piece, utmost point auricle with wear to locate in proper order the second through-hole reaches first through-hole roll core utmost point ear is connected.
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Effective date of registration: 20240313 Address after: No. 2 Xinglin North Street, Shenguang Avenue, Economic Development Zone, Guang'an City, Sichuan Province, 638019 Patentee after: Sichuan Chaoju Battery Co.,Ltd. Country or region after: China Address before: 516000 12 Industrial Road, Dongjiang Industrial Zone, Shuikou street, Huicheng District, Huizhou, Guangdong Patentee before: HUIZHOU SUPER POLYPOWER BATTERY CO.,LTD. Country or region before: China |