WO2022172412A1 - リード部材 - Google Patents
リード部材 Download PDFInfo
- Publication number
- WO2022172412A1 WO2022172412A1 PCT/JP2021/005339 JP2021005339W WO2022172412A1 WO 2022172412 A1 WO2022172412 A1 WO 2022172412A1 JP 2021005339 W JP2021005339 W JP 2021005339W WO 2022172412 A1 WO2022172412 A1 WO 2022172412A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lead
- treatment layer
- main surface
- surface treatment
- nickel
- Prior art date
Links
- 229920005989 resin Polymers 0.000 claims abstract description 90
- 239000011347 resin Substances 0.000 claims abstract description 90
- 239000004020 conductor Substances 0.000 claims abstract description 80
- 229910052751 metal Inorganic materials 0.000 claims abstract description 52
- 239000002184 metal Substances 0.000 claims abstract description 52
- 239000011651 chromium Substances 0.000 claims abstract description 32
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 23
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 13
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011737 fluorine Substances 0.000 claims abstract description 12
- 239000001301 oxygen Substances 0.000 claims abstract description 12
- 238000009834 vaporization Methods 0.000 claims abstract description 7
- 230000008016 vaporization Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000002335 surface treatment layer Substances 0.000 claims description 79
- 239000000758 substrate Substances 0.000 claims description 30
- 238000000862 absorption spectrum Methods 0.000 claims description 28
- 239000010949 copper Substances 0.000 claims description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 229910000838 Al alloy Inorganic materials 0.000 claims description 12
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 238000002329 infrared spectrum Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 238000005443 coulometric titration Methods 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 239000010410 layer Substances 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- -1 polypropylene Polymers 0.000 claims description 5
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 4
- 238000001159 Fisher's combined probability test Methods 0.000 abstract 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 26
- 238000005260 corrosion Methods 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000007788 liquid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000007789 sealing Methods 0.000 description 8
- 238000004381 surface treatment Methods 0.000 description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000008151 electrolyte solution Substances 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000004998 X ray absorption near edge structure spectroscopy Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000010606 normalization Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 239000006200 vaporizer Substances 0.000 description 3
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 2
- 238000003869 coulometry Methods 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 108010067216 glycyl-glycyl-glycine Proteins 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 239000011342 resin composition Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- GZXOHHPYODFEGO-UHFFFAOYSA-N triglycine sulfate Chemical compound NCC(O)=O.NCC(O)=O.NCC(O)=O.OS(O)(=O)=O GZXOHHPYODFEGO-UHFFFAOYSA-N 0.000 description 2
- 101000575029 Bacillus subtilis (strain 168) 50S ribosomal protein L11 Proteins 0.000 description 1
- 101000682328 Bacillus subtilis (strain 168) 50S ribosomal protein L18 Proteins 0.000 description 1
- 102100035793 CD83 antigen Human genes 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 101000946856 Homo sapiens CD83 antigen Proteins 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- IZJSTXINDUKPRP-UHFFFAOYSA-N aluminum lead Chemical group [Al].[Pb] IZJSTXINDUKPRP-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000005469 synchrotron radiation Effects 0.000 description 1
- NJSCURCAHMSDSL-UHFFFAOYSA-K trifluorochromium;tetrahydrate Chemical compound O.O.O.O.[F-].[F-].[F-].[Cr+3] NJSCURCAHMSDSL-UHFFFAOYSA-K 0.000 description 1
Images
Classifications
-
- 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
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
-
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
-
- 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
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/193—Organic material
-
- 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
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/197—Sealing members characterised by the material having a layered structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the material
-
- 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
Definitions
- the present disclosure relates to lead members.
- a non-aqueous electrolyte battery such as a lithium-ion battery has a structure in which a positive electrode, a negative electrode, and an electrolytic solution are housed in an enclosure made of a laminated film, and lead members (tab leads) connected to the positive electrode and negative electrode are hermetically sealed and taken out to the outside. It has become.
- the lead member is an aluminum lead conductor for the positive electrode, or nickel or nickel-plated copper lead conductor for the negative electrode. are welded from both sides.
- a surface treatment layer is formed on the surface of the lead conductor.
- a lead member of the present disclosure includes a lead conductor having a first main surface and a second main surface opposite to the first main surface, and exposing both end portions of the lead conductor in the first direction. a resin portion covering the first main surface, the second main surface, and both side surfaces of the lead conductor between the both ends of the lead conductor, the lead conductor comprising a metal substrate; A surface treatment layer formed on at least part of the surface of the metal substrate and containing chromium, oxygen and fluorine, wherein the vaporization temperature of the surface treatment layer is measured by Karl Fischer coulometric titration at 220 ° C. The moisture content of the portion exposed from the resin portion is 5.0 ⁇ g/cm 2 or less.
- FIG. 1 is a plan view showing a lead member according to the first embodiment.
- FIG. FIG. 2 is a cross-sectional view (part 1) showing the lead member according to the first embodiment.
- FIG. 3 is a cross-sectional view (No. 2) showing the lead member according to the first embodiment.
- FIG. 4 is a plan view (No. 1) showing the method of manufacturing the lead member according to the first embodiment.
- FIG. 5 is a plan view (No. 2) showing the method of manufacturing the lead member according to the first embodiment.
- FIG. 6 is a plan view (No. 3) showing the method of manufacturing the lead member according to the first embodiment.
- FIG. 7 is a plan view (No. 4) showing the method of manufacturing the lead member according to the first embodiment.
- FIG. 8 is a diagram showing an example of a reflected infrared spectrum.
- FIG. 9 is a diagram showing an example of an X-ray absorption spectrum.
- FIG. 10 is an enlarged view of a part of FIG. 9.
- FIG. 11 is a schematic diagram showing an enclosed bag type non-aqueous electrolyte battery.
- FIG. 12 is a cross-sectional view showing a battery module including a plurality of non-aqueous electrolyte batteries.
- a lead member includes a lead conductor including a first main surface and a second main surface opposite to the first main surface, and while exposing both ends of the lead conductor and covering the first main surface, the second main surface, and both side surfaces between the both ends of the lead conductor, wherein the lead conductor has , a metal substrate, and a surface treatment layer formed on at least part of the surface of the metal substrate and containing chromium, oxygen and fluorine, and the vaporization temperature is measured by Karl Fischer coulometric titration at 220 ° C. and a water content of a portion of the surface treatment layer exposed from the resin portion is 5.0 ⁇ g/cm 2 or less.
- the inventors of the present application conducted extensive research to find out the cause of the inability to obtain sufficient weldability in conventional lead members. As a result, it has been found that the surface treatment liquid may not be sufficiently dried when forming the surface treatment layer. It was also found that the weldability is low when the surface treatment liquid is insufficiently dried and the water content in the surface treatment layer exceeds 5.0 ⁇ g/cm 2 .
- a surface treatment liquid containing trivalent chromium is sometimes used to form the surface treatment layer. In this case, chromium is contained in the surface treatment liquid in a state in which water of hydration is combined with trivalent chromium ions, and excessive moisture may remain in the surface treatment layer if drying is insufficient.
- the water content of the portion exposed from the resin portion of the surface treatment layer measured by Karl Fischer coulometric titration at a vaporization temperature of 220° C., is 5.0 ⁇ g/cm 2 or less. . Therefore, the water content in the surface treatment layer is sufficiently low, and excellent weldability can be obtained.
- a lead member includes a lead conductor including a first main surface and a second main surface opposite to the first main surface; a resin portion that covers the first main surface, the second main surface, and both side surfaces of the lead conductor between the both ends of the lead conductor while exposing both ends in the direction of the lead;
- the conductor has a metal substrate and a surface treatment layer formed on at least a portion of the surface of the metal substrate and containing chromium, oxygen and fluorine, and the portion of the surface treatment layer exposed from the resin portion.
- the parameter obtained by dividing the peak intensity integral value within the wave number range of 2750 cm -1 or more and 3700 cm -1 or less in the reflected infrared spectroscopy spectrum by the chromium content per unit area ( ⁇ g/cm 2 ) value is 10.0 or less.
- a peak derived from Cr—OH bond appears in the wave number range of 2750 cm ⁇ 1 to 3700 cm ⁇ 1 in the reflected infrared spectrum. That is, it means that the larger the value of the parameter, the more hydroxyl groups are present in the surface layer portion of the surface treatment layer. If there are too many hydroxyl groups, the drying may be insufficient and excessive moisture may remain in the surface treatment layer.
- the value of the above parameter is 10.0 or less, the hydroxyl groups contained in the surface treatment layer are sufficiently small, and excellent weldability can be obtained.
- a lead member includes a lead conductor having a first principal surface and a second principal surface opposite to the first principal surface, and a second principal surface of the lead conductor. a resin portion that covers the first main surface, the second main surface, and both side surfaces between the both ends of the lead conductor while exposing both ends in one direction;
- the lead conductor has a metal substrate and a surface treatment layer formed on at least part of the surface of the metal substrate and containing chromium, oxygen and fluorine, and is exposed from the resin portion of the surface treatment layer.
- the X-ray energy is 6008 eV on the X-ray absorption spectrum
- the angle BAC is 17 degrees or less, where point A is the point when the X-ray energy is 6011 eV, point B is the point when the X-ray energy is 6016 eV, and point C is the point when the X-ray energy is 6016 eV,
- the size of one scale on the horizontal axis is equal to the size of one scale on the vertical axis.
- the X-ray absorption spectrum reflects the coordination environment of oxygen and fluorine with respect to chromium, and the larger the angle BAC, the weaker the bonding between atoms in the surface treatment layer. If the bond is too weak, it will not provide adequate corrosion resistance.
- the angle BAC is 17 degrees or less, the bonding between atoms is good, and excellent corrosion resistance is obtained.
- the surface treatment layer may be an inorganic layer. In this case, excellent heat resistance is obtained.
- the surface treatment layer may not contain C. In this case, excellent heat resistance is obtained.
- the surface treatment layer may be provided at least between the metal substrate and the resin portion. In this case, when used in a non-aqueous electrolyte battery, leakage of the electrolytic solution can be easily suppressed.
- the surface treatment layer may be provided on the entirety of the first main surface and the second main surface. In this case, it is easy to obtain excellent corrosion resistance over the entire lead conductor.
- the metal substrate is aluminum, aluminum alloy, nickel, nickel alloy, copper, copper alloy, nickel-plated aluminum, nickel-plated aluminum alloy, nickel-plated copper, nickel-plated copper alloy , nickel-clad aluminum, nickel-clad aluminum alloy, nickel-clad copper or nickel-clad copper alloy. In this case, it is easy to obtain good conductivity.
- the resin portion may contain polypropylene. In this case, the resin portion is easily heat-sealed to the lead conductor.
- a first embodiment relates to a lead member.
- This lead member can be used, for example, as a tab lead for a non-aqueous electrolyte battery such as a lithium ion battery.
- FIG. 1 is a plan view showing a lead member according to the first embodiment.
- FIG. 2 and 3 are cross-sectional views showing the lead member according to the first embodiment.
- FIG. 2 corresponds to a cross-sectional view taken along line II-II in FIG.
- FIG. 3 corresponds to a cross-sectional view taken along line III-III in FIG.
- the lead member 1 has a lead conductor 10 and a resin portion 30.
- the lead conductor 10 has a first principal surface 11, a second principal surface 12 opposite to the first principal surface 11, and two side surfaces 13 connecting the first principal surface 11 and the second principal surface 12.
- the lead conductor 10 has a metal base 20 and a surface treatment layer 21 .
- the lead conductor 10 has, for example, a rectangular planar shape.
- the direction in which one pair of sides parallel to each other extends is the X direction
- the direction in which the other pair of sides parallel to each other extends is the Y direction
- the direction of the first principal surface 11 is Let the linear direction be the Z direction.
- the dimension in the X direction may be larger or smaller than the dimension in the Y direction, or may be the same as the dimension in the Y direction.
- both sides 13 are perpendicular to the Y direction.
- the X direction is an example of a first direction.
- the lead conductor 10 has a belt-like shape, and its dimensions are appropriately set according to need.
- the lead conductor 10 has a thickness of 0.05 mm or more and 5.0 mm or less, a length of 1 mm or more and 100 mm or less in the X direction, and a length of 10 mm or more and 200 mm or less in the Y direction.
- the metal substrate 20 is made of, for example, aluminum (Al), aluminum alloy, nickel (Ni), nickel alloy, copper (Cu), copper alloy, nickel-plated aluminum, nickel-plated aluminum alloy, nickel-plated copper, nickel-plated copper alloy, It is made of nickel-clad aluminum, nickel-clad aluminum alloy, nickel-clad copper, nickel-clad copper alloy, or the like. By using these metal materials, the lead conductor 10 with good conductivity can be easily obtained.
- the surface treatment layer 21 includes the entire surface of the metal substrate 20 on the first main surface 11 side, the entire surface of the metal substrate 20 on the second main surface 12 side, and one side surface of the metal substrate 20. It covers the entire surface on the 13 side and the entire surface on the other side surface 13 side of the metal substrate 20 .
- the surface treatment layer 21 contains chromium (Cr), oxygen (O) and fluorine (F).
- the surface treatment layer 21 is preferably composed of Cr, O and F, but may contain unavoidable impurities such as silicon (Si).
- the surface treatment layer 21 is an inorganic layer and preferably does not contain carbon (C). From the viewpoint of environmental load, Cr is preferably trivalent Cr.
- the moisture content of the portion of the surface treatment layer 21 exposed from the resin portion 30 measured by Karl Fischer coulometric titration at a vaporization temperature of 220° C. is 5.0 ⁇ g/cm 2 or less, preferably It is 3.0 ⁇ g/cm 2 or less, more preferably 2.0 ⁇ g/cm 2 or less. If the moisture content of the portion of the surface treatment layer 21 exposed from the resin portion 30 exceeds 5.0 ⁇ g/cm 2 , sufficient weldability cannot be obtained. For example, when a plurality of lead members 1 are stacked and the portions of the lead conductors 10 exposed from the resin portion 30 are welded together, there is a possibility that the plurality of lead members 1 will be misaligned.
- a moisture vaporizer for example, VA-230 manufactured by Nitto Seiko Analytic Tech Co., Ltd. can be used.
- the lead member is put into the moisture vaporizer.
- the surface treatment layer is heated to 220° C. to vaporize water contained in the surface treatment layer, and the vaporized water is measured with a coulometric Karl Fischer moisture meter.
- the coulometric Karl Fischer moisture meter for example, CA-200 manufactured by Nitto Seiko Analytic Tech Co., Ltd. can be used.
- A1 is the titration amount ( ⁇ m) of the sample
- A0 is the average value of the titration amount of the blank
- S is the total area (cm 2 ) of the portion exposed from the resin portion of the surface treatment layer in the sample. be.
- the value obtained by Equation 1 is rounded off, for example, to the second decimal place.
- the resin portion 30 exposes both ends of the lead conductor 10 in the X direction, and covers the first main surface 11, the second main surface 12, and both side surfaces 13 between these ends.
- the resin portion 30 is arranged so as to cover the outer peripheral side of a part of the region in the X direction, excluding the region including both end portions of the lead conductor 10 in the X direction. Therefore, the surface treatment layer 21 is provided at least between the metal substrate 20 and the resin portion 30 . Since both ends of the lead conductor 10 in the X direction are electrically connected to conductive portions such as electrodes and terminals, the resin portions 30 are not provided and are exposed.
- the resin portion 30 has, for example, resin films 31 and 32 that are attached to each other so as to sandwich the lead conductor 10 .
- the Y-direction dimensions of the resin films 31 and 32 are larger than the Y-direction dimensions of the lead conductor 10, thereby improving sealing performance.
- the resin films 31 and 32 have a thickness of 30 ⁇ m or more and 500 ⁇ m or less, a length of 2 mm or more and 50 mm or less in the X direction, and a length of 3 mm or more and 250 mm or less in the Y direction.
- the resin film 31 is provided on the first major surface 11 and the resin film 32 is provided on the second major surface 12 .
- the resin films 31 and 32 are, for example, resin moldings made of a resin composition containing polypropylene (PP).
- PP polypropylene
- the resin portion 30 containing polypropylene facilitates heat-sealing the resin portion 30 to the lead conductor 10 .
- the form of the resin molding does not necessarily have to be a film state.
- it may be a seamless resin portion formed by applying or extruding a resin composition around the lead conductor 10 .
- the resin films 31 and 32 each have a single-layer structure, but instead of the single-layer resin films 31 and 32, a laminate containing a plurality of resin films may be used.
- the resin films 31 and 32 include a first layer made of polyolefin resin such as maleic anhydride-modified low-density polyethylene (PE) and polypropylene (PP), and a second layer made of polyolefin resin such as low-density polyethylene. can be used.
- the surface treatment layer 21 contains F, corrosion resistance to a non-aqueous electrolyte, particularly a non-aqueous electrolyte containing hydrofluoric acid, is excellent. Further, the moisture content of the portion exposed from the resin portion 30 of the surface treatment layer 21 measured by Karl Fischer coulometric titration at a vaporization temperature of 220° C. is 5.0 ⁇ g/cm 2 or less. Therefore, excellent weldability is obtained. In addition, since the water content is low and the amount of hydrate contained in the surface treatment layer 21 is small, the reaction between the surface treatment layer 21 and the non-aqueous electrolyte is suppressed, making it easy to maintain good battery performance.
- the surface treatment layer 21 is an inorganic layer and does not contain C, excellent heat resistance can be obtained.
- superior heat resistance can be obtained as compared with a surface treatment layer using an organic resin.
- the electrolytic solution does not permeate between the metal substrate 20 and the resin portion 30 when used in a non-aqueous electrolyte battery. Hateful. Therefore, it is easy to suppress leakage of the electrolytic solution.
- the surface treatment layer 21 does not need to be provided on the entire first main surface 11 and the second main surface 12, but if it is provided on the entire first main surface 11 and the second main surface 12 , it is easy to obtain excellent corrosion resistance over a wide range of the lead conductor 10 .
- FIG. 1 are plan views showing the manufacturing method of the lead member 1 according to the first embodiment.
- 4A and 4B are plan views showing a method of manufacturing the lead member 1; FIG.
- a metal tape 120 is prepared.
- the metal tape 120 will later become the metal substrate 20 .
- the metal tape 120 is made of, for example, aluminum (Al), aluminum alloy, nickel (Ni), nickel alloy, copper (Cu), copper alloy, nickel-plated aluminum, nickel-plated aluminum alloy, nickel-plated copper, nickel-plated copper alloy, nickel It is made of clad aluminum, nickel-clad aluminum alloy, nickel-clad copper, nickel-clad copper alloy, or the like.
- surface treatment layer 121 is formed on the surface of metal tape 120 .
- the surface treatment layer 121 becomes the surface treatment layer 21 later.
- a surface treatment liquid containing chromium fluoride tetrahydrate (CrF 3 .4H 2 O) is applied to the surface of the metal tape 120 and dried at a temperature of 220° C. or higher, for example. That is, a surface treatment liquid containing trivalent Cr is used. Drying promotes the cross-linking reaction of Cr. Drying is performed, for example, in an air atmosphere with a relative humidity of 75% RH or less.
- a plurality of sets of resin films 31 and 32 are prepared, and the resin films 31 and 32 are bonded together so as to sandwich the metal tape 120 with the surface treatment layer 121 formed thereon. Then, the metal tape 120 on which the surface treatment layer 121 is formed and the resin films 31 and 32 are sandwiched between the upper head and the lower head of a hot press machine, and hot pressing is performed to obtain the resin film 31 and the resin films 31 and 32. 32 is heat-sealed to the metal tape 120 on which the surface treatment layer 121 is formed. This process is performed on the metal tape 120 at regular intervals. Thus, a lead member continuum is obtained.
- the lead member continuum is cut between pairs of adjacent resin films 31 and 32 .
- a plurality of lead members 1 are obtained.
- the lead member continuous body is cut after the resin films 31 and 32 are heat-sealed to the metal tape 120.
- the resin films 31 and 32 may be heat-sealed after being divided into two.
- a second embodiment relates to a lead member.
- the second embodiment differs from the first embodiment in the characteristics of the surface treatment layer 21 .
- the peak intensity integrated value within the wave number range of 2750 cm ⁇ 1 or more and 3700 cm ⁇ 1 or less in the reflected infrared spectrum of the portion exposed from the resin part 30 of the surface treatment layer 21 is
- the value of the parameter P obtained by dividing by the chromium content is 10.0 or less, preferably 7.0 or less, more preferably 5.0 or less.
- the value of the parameter P reflects the amount of hydroxyl groups in the surface treatment layer 21, and if the value of the parameter P exceeds 10.0, sufficient weldability cannot be obtained. For example, when a plurality of lead members are stacked and the portions of the lead conductors 10 exposed from the resin portion 30 are welded together, there is a possibility that the plurality of lead members will be misaligned.
- FIG. 8 is a diagram showing an example of a reflected infrared spectrum.
- the horizontal axis of FIG. 8 indicates the wave number (cm ⁇ 1 ), and the vertical axis indicates the absorbance (dimensionless).
- the angle-variable reflection accessory is attached to the infrared spectrometer, and the reflected infrared spectrum 51 of the surface of the sample is acquired.
- an infrared spectrometer for example, Nicolet 8700 manufactured by Thermo Fisher Scientific Co., Ltd. can be used.
- the variable-angle reflective accessory for example, a variable-angle reflective accessory (P/N 81030782) manufactured by Thermo Fisher Scientific, Inc. can be used.
- the wavenumber range is 4000 cm ⁇ 1 to 600 cm ⁇ 1
- the wavenumber resolution is 4 cm ⁇ 1
- the number of times of accumulation is 32
- the incident angle of the light source is 80°.
- Triglycine sulfate (TGS) is used for the detector.
- a gold (Au) plate is used as the background.
- a second baseline 52 is defined as a straight line connecting the point P1 at 2700 cm ⁇ 1 and the point P2 at 3950 cm ⁇ 1 in the reflected infrared spectrum 51 .
- the area of the region 53 surrounded by the reflected infrared spectroscopic spectrum 51 and the second baseline 52 is calculated as the peak intensity integral value B within the wavenumber range of 2750 cm ⁇ 1 to 3700 cm ⁇ 1 .
- the Cr content X ( ⁇ g/cm 2 ) per unit area of the surface of the sample is measured.
- the Cr content X can be determined by a general analytical method such as inductively coupled plasma optical emission spectrometry (ICP-OES).
- the parameter P is specified by Equation 2 below. The value obtained by Equation 2 is rounded off, for example, to the second decimal place.
- the surface treatment layer 21 contains F, corrosion resistance to a non-aqueous electrolyte, particularly a non-aqueous electrolyte containing F, is excellent.
- the peak intensity integrated value within the wavenumber range of 2750 cm ⁇ 1 or more and 3700 cm ⁇ 1 or less in the reflected infrared spectrum of the portion exposed from the resin part 30 of the surface treatment layer 21 is measured as the chromium content per unit area.
- the value of the parameter P obtained by dividing by ( ⁇ g/cm ⁇ 1 ) is 10.0 or less. Therefore, excellent weldability is obtained.
- the amount of hydroxyl groups is small, the decomposition of the non-aqueous electrolyte due to the hydroxyl groups contained in the surface treatment layer 21 can be suppressed.
- the hydroxyl group and the non-aqueous electrolyte react, pinholes may be generated and the non-aqueous electrolyte may come into contact with the metal substrate 20, causing elution of metal ions from the metal substrate 20. The possibility of elution can be reduced.
- the lead member according to the second embodiment can be manufactured by the same method as in the first embodiment.
- a third embodiment will be described.
- the third embodiment relates to lead members.
- the third embodiment differs from the first and second embodiments in terms of the properties of the surface treatment layer 21 .
- the X-ray energy of the exposed portion of the surface treatment layer 21 from the resin portion 30 is set to 1 eV on the horizontal axis, and the X-ray absorption on the vertical axis is set to 0.1 on the scale.
- point A is the point when the X-ray energy is 6008 eV
- point B is the point when the X-ray energy is 6011 eV
- point C is the point when the X-ray energy is 6016 eV
- the angle BAC is 17 degrees or less
- the length of one scale on the horizontal axis is equal to the length of one scale on the vertical axis.
- the magnitude of the angle BAC is preferably 12 degrees or less, more preferably 10 degrees or less.
- the X-ray absorption spectrum reflects the coordination environment of oxygen (O) and fluorine (F) with respect to chromium (Cr). The bond between them is weak, and sufficient corrosion resistance cannot be obtained. For example, when immersed in a lithium ion battery electrolyte, the lithium ion battery electrolyte may enter the interface between the lead conductor and the resin film through the surface treatment layer 21, causing peeling of the resin film.
- an X-ray absorption spectrum is measured by a conversion electron yield method.
- X-ray absorption spectra may be measured by other methods such as transmission or fluorescence yield methods.
- the horizontal axis is X-ray energy (eV) and the vertical axis is normalized X-ray absorption (arbitrary unit au).
- the analysis equipment installed in multiple beamlines (specifically BL16B2 or BL14B2) of the large synchrotron radiation facility SPring-8 (Spring Eight) can be used. good.
- BL11 or BL16 of Kyushu Synchrotron Light Research Center (SAGA-LS) may be used.
- BL5S1 or BL11S2 of Aichi Synchrotron Light Center (AichiSR) may be used.
- Other equipment capable of measuring X-ray absorption spectra may also be used.
- the value of the X-ray energy on the horizontal axis is calibrated instead of being used for evaluation as it is.
- the metal chromium is used to calibrate the horizontal axis. Specifically, the X-ray absorption spectrum of metal chromium is measured, and the values on the horizontal axis are adjusted and calibrated so that the peak top of the X-ray absorption spectrum is 6008.2 eV. The peak top apex of metallic chromium is close to 6008.2 eV. On the other hand, as described above, point A is the point when the X-ray energy is 6008 eV. The reason why such a difference of 0.2 eV is provided is that the peak top is slightly lowered when oxygen and fluorine are coordinated to chromium.
- the normalization of the X-ray absorption on the vertical axis of the X-ray absorption spectrum is performed as follows. For example, for the X-ray absorption spectrum, an arbitrary range from the lowest ⁇ 5900 eV to the highest ⁇ 5970 eV is subtracted as the background region, and an arbitrary range from the lowest 6050 eV to the highest 6900 eV is set as the normalization region. However, the distance between the two points defining the background region is at least 10 eV, and the distance between the two points defining the normalized region is at least 20 eV.
- X-ray absorption Near Edge Structure For normalization of the X-ray absorption on the vertical axis of the X-ray absorption spectrum, for example, commercially available software such as REX2000 manufactured by Rigaku Corporation may be used. Free software such as Athena, which is specialized for analysis of X-ray Absorption Near Edge Structure (XANES) spectra, may be used. Using such analysis software, XANES can be graphed based on the analysis procedure described above, and the shape of the X-ray absorption spectrum described above can be evaluated from the graph.
- REX2000 X-ray Absorption Near Edge Structure
- FIG. 10 is an enlarged view of region R in FIG. 9 and 10, the horizontal axis is X-ray energy (eV) and the vertical axis is normalized X-ray absorption (arbitrary unit au).
- 9 and 10 show a surface treatment layer (first film) having an angle BAC of 17 degrees or less, a surface treatment layer (second film) having an angle BAC of more than 17 degrees, and An X-ray absorption spectrum of a metal Cr film for reference is shown.
- the angle B 1 A 1 C 1 measures 4.2 degrees
- the angle B 2 A 2 C 2 measures 28.6 degrees. Good corrosion resistance is obtained with the first film, but sufficient corrosion resistance is not obtained with the second film.
- the measurement point at the X-ray energy closest to 6008 eV within the range of 6007.5 eV to 6008.5 eV may be the point A.
- point B may be the measurement point at the X-ray energy closest to 6011 eV within the range of 6010.5 eV to 6011.5 eV.
- point C may be the measurement point at the X-ray energy closest to 6016 eV within the range of 6015.5 eV to 6016.5 eV.
- the corrosion resistance to non-aqueous electrolytes is excellent. Also, the magnitude of the angle BAC in the X-ray absorption spectrum is 17 degrees or less. Therefore, excellent corrosion resistance is obtained.
- FIG. 11 is a schematic diagram showing an enclosed bag type non-aqueous electrolyte battery.
- a positive electrode 205A and a negative electrode 205B are superimposed with a separator 206 interposed therebetween.
- the lead conductor 210A of the positive electrode tab lead 201A is joined to the positive electrode 205A by welding or the like.
- the lead conductor 210B of the negative electrode tab lead 201B is joined to the negative electrode 205B by welding or the like.
- the positive electrode 205A, the negative electrode 205B, the separator 206, and the positive electrode 205A, the negative electrode 205B, and the separator 206 are arranged so that a part of the positive electrode tab lead 201A and the negative electrode tab lead 201B (part of the side opposite to the positive electrode 205A and the negative electrode 205B) protrudes outside the sealing bag 211.
- An assembly 230 including a positive electrode tab lead 201A and a negative electrode tab lead 201B is housed in a sealing bag 211 .
- the lead member 1 according to the first embodiment is used for the tab leads 201A and 201B. That is, the tab lead 201A has a lead conductor 210A corresponding to the lead conductor 10 and a resin portion 230A corresponding to the resin portion 30. As shown in FIG. The tab lead 201B has a lead conductor 210B corresponding to the lead conductor 10 and a resin portion 230B corresponding to the resin portion 30. As shown in FIG.
- An electrolytic solution is injected into the enclosure bag 211 .
- the lead conductors 210A and 210B taken out to the outside are sandwiched, and the opening of the sealing bag 211 is heat-sealed so as to overlap with the resin parts 230A and 230B of the tab leads 201A and 201B arranged in the opening of the sealing bag 211.
- One ends of the lead conductors 210A and 210B and the resin portions 230A and 230B in the X direction are arranged outside the sealing bag 211 .
- the non-aqueous electrolyte battery 200 has such a configuration.
- the lead member according to the second or third embodiment may be used for the tab leads 201A and 201B.
- the non-aqueous electrolyte battery 200 may be used by, for example, stacking a plurality of the lead conductors 210A and welding the lead conductors 210B arranged outside the enclosing bag 211 together.
- FIG. 12 is a cross-sectional view showing a battery module including a plurality of non-aqueous electrolyte batteries.
- the battery module 300 includes, for example, two non-aqueous electrolyte batteries 200.
- One ends of the lead conductors 210A arranged outside the sealing bag 211 of each non-aqueous electrolyte battery 200 are joined to each other by welding.
- 210 A of lead conductors have the metal base material 220 corresponded to the metal base material 20, and the surface treatment layer 221 corresponded to the surface treatment layer 21.
- FIG. The resin portion 230A has a resin film 231 corresponding to the resin film 31 and a resin film 232 corresponding to the resin film 32 .
- the lead conductor 210B has a metal base 220 corresponding to the metal base 20 and a surface treatment layer 221 corresponding to the surface treatment layer 21 .
- the resin portion 230 ⁇ /b>B has a resin film 231 corresponding to the resin film 31 and a resin film 232 corresponding to the resin film 32 .
- a lead conductor 210A included in the tab lead 201A and a lead conductor 210B included in the tab lead 201B correspond to the lead conductor 10 and have excellent weldability. Therefore, between the two non-aqueous electrolyte batteries 200, welding between the lead conductors 210A and welding between the lead conductors 210B are performed satisfactorily.
- the lead member was immersed in the lithium ion battery electrolyte for 24 hours, and the presence or absence of peeling of the resin film was checked.
- A indicates that the adhesion strength of the resin film is 10 N/cm or more at 180° peeling, and B indicates that it is less than 10 N/cm.
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Abstract
Description
従来のリード部材では、複数のリード部材を重ねて溶接したときに十分な溶接性が得られないことがある。
本開示によれば、優れた溶接性が得られる。
最初に本開示の実施態様を列記して説明する。以下の説明では、同一または対応する要素には同一の符号を付し、それらについて同じ説明は繰り返さない。
以下、本開示の実施形態について詳細に説明するが、本実施形態はこれらに限定されるものではない。なお、本明細書及び図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複した説明を省くことがある。各図には、説明の便宜のためXYZ直交座標系が設定されている。
第1実施形態について説明する。第1実施形態はリード部材に関する。このリード部材は、例えばリチウムイオン電池等の非水電解質電池のタブリードとして使用できる。
まず、リード部材の構造について説明する。図1は、第1実施形態に係るリード部材を示す平面図である。図2及び図3は、第1実施形態に係るリード部材を示す断面図である。図2は、図1中のII-II線に沿った断面図に相当する。図3は、図1中のIII-III線に沿った断面図に相当する。
A=(A1-A0)/S (式1)
次に、リード部材1の製造方法について説明する。図4~図7は、第1実施形態に係るリード部材1の製造方法を示す平面図である。
リード部材1の製造方法を示す平面図である。
第2実施形態について説明する。第2実施形態はリード部材に関する。第2実施形態は、表面処理層21の特性の点で第1実施形態と相違する。
P=B/X (式2)
第3実施形態について説明する。第3実施形態はリード部材に関する。第3実施形態は、表面処理層21の特性の点で第1実施形態及び第2実施形態と相違する。
10:リード導体
11:第1主面
12:第2主面
13:側面
20:金属基材
21:表面処理層
30:樹脂部
31:樹脂フィルム
32:樹脂フィルム
51:反射赤外分光スペクトル
52:第2ベースライン
53:領域
120:金属テープ
121:表面処理層
200:非水電解質電池
201A:正極用タブリード
201B:負極用タブリード
205A:正極
205B:負極
206:セパレータ
210A:リード導体
210B:リード導体
211:封入袋
220:金属基材
221:表面処理層
230:組立体
230A:樹脂部
230B:樹脂部
231:樹脂フィルム
232:樹脂フィルム
300:電池モジュール
Claims (9)
- 第1主面と、前記第1主面とは反対側の第2主面とを備えたリード導体と、
前記リード導体の第1方向での両端部を露出しながら、前記リード導体の前記両端部の間で、前記第1主面と、前記第2主面と、両側面とを覆う樹脂部と、
を有し、
前記リード導体は、
金属基材と、
前記金属基材の表面の少なくとも一部に形成され、クロム、酸素及びフッ素を含む表面処理層と、
を有し、
気化温度が220℃のカールフィッシャー電量滴定により測定される、前記表面処理層の前記樹脂部から露出した部分の水分含有量が5.0μg/cm2以下であるリード部材。 - 第1主面と、前記第1主面とは反対側の第2主面とを備えたリード導体と、
前記リード導体の第1方向での両端部を露出しながら、前記リード導体の前記両端部の間で、前記第1主面と、前記第2主面と、両側面とを覆う樹脂部と、
を有し、
前記リード導体は、
金属基材と、
前記金属基材の表面の少なくとも一部に形成され、クロム、酸素及びフッ素を含む表面処理層と、
を有し、
前記表面処理層の前記樹脂部から露出した部分の、反射赤外分光スペクトルにおける2750cm-1以上3700cm-1以下の波数範囲内でのピーク強度積分値を、単位面積当たりのクロムの含有量(μg/cm2)で除して得られるパラメータの値が10.0以下であるリード部材。 - 第1主面と、前記第1主面とは反対側の第2主面とを備えたリード導体と、
前記リード導体の第1方向での両端部を露出しながら、前記リード導体の前記両端部の間で、前記第1主面と、前記第2主面と、両側面とを覆う樹脂部と、
を有し、
前記リード導体は、
金属基材と、
前記金属基材の表面の少なくとも一部に形成され、クロム、酸素及びフッ素を含む表面処理層と、
を有し、
前記表面処理層の前記樹脂部から露出した部分の、横軸を1目盛りが1eVのX線エネルギーとし、縦軸を1目盛りが0.1のX線吸収としたX線吸収スペクトルにおいて、前記X線吸収スペクトル上の、X線エネルギーが6008eVのときの点を点A、X線エネルギーが6011eVのときの点を点B、X線エネルギーが6016eVのときの点を点C、としたとき、角BACの大きさが17度以下であり、
前記横軸の1目盛りの大きさと前記縦軸の1目盛りの大きさが等しいリード部材。 - 前記表面処理層は無機物層である請求項1から請求項3のいずれか1項に記載のリード部材。
- 前記表面処理層はCを含まない請求項1から請求項4のいずれか1項に記載のリード部材。
- 前記表面処理層は、少なくとも前記金属基材と前記樹脂部との間に設けられている請求項1から請求項5のいずれか1項に記載のリード部材。
- 前記表面処理層は、前記第1主面及び前記第2主面の全体に設けられている請求項1から請求項6のいずれか1項に記載のリード部材。
- 前記金属基材は、アルミニウム、アルミニウム合金、ニッケル、ニッケル合金、銅、銅合金、ニッケルめっきアルミニウム、ニッケルめっきアルミニウム合金、ニッケルめっき銅、ニッケルめっき銅合金、ニッケルクラッドアルミニウム、ニッケルクラッドアルミニウム合金、ニッケルクラッド銅又はニッケルクラッド銅合金から形成されている請求項1から請求項7のいずれか1項に記載のリード部材。
- 前記樹脂部は、ポリプロピレンを含む請求項1から請求項8のいずれか1項に記載のリード部材。
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US18/263,588 US20240106045A1 (en) | 2021-02-12 | 2021-02-12 | Lead member |
CN202180091549.4A CN116745976A (zh) | 2021-02-12 | 2021-02-12 | 引线构件 |
KR1020237026705A KR20230145338A (ko) | 2021-02-12 | 2021-02-12 | 리드 부재 |
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Citations (2)
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JP2011159569A (ja) * | 2010-02-03 | 2011-08-18 | Toppan Printing Co Ltd | 二次電池用金属端子 |
JP2013171738A (ja) * | 2012-02-21 | 2013-09-02 | Fujimori Kogyo Co Ltd | 非水系電池用の電極リード線部材 |
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JP3784400B1 (ja) | 2005-05-27 | 2006-06-07 | 日本パーカライジング株式会社 | 金属用化成処理液および処理方法 |
JP5562176B2 (ja) | 2010-08-24 | 2014-07-30 | 藤森工業株式会社 | 非水系電池用の電極リード線部材 |
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JP2011159569A (ja) * | 2010-02-03 | 2011-08-18 | Toppan Printing Co Ltd | 二次電池用金属端子 |
JP2013171738A (ja) * | 2012-02-21 | 2013-09-02 | Fujimori Kogyo Co Ltd | 非水系電池用の電極リード線部材 |
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