Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
  • B32B15/017—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of aluminium or an aluminium alloy, another layer being formed of an alloy based on a non ferrous metal other than aluminium
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
  • B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
  • B23K20/023—Thermo-compression bonding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/001—Interlayers, transition pieces for metallurgical bonding of workpieces
  • B23K35/002—Interlayers, transition pieces for metallurgical bonding of workpieces at least one of the workpieces being of light metal
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/001—Interlayers, transition pieces for metallurgical bonding of workpieces
  • B23K35/004—Interlayers, transition pieces for metallurgical bonding of workpieces at least one of the workpieces being of a metal of the iron group
• • 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 invention relates to an external terminal joined to a battery outer can and an aluminum Z nickel clad material that can be suitably used as a material thereof.
• Small electronic devices such as mobile phones and notebook PCs ⁇ Small batteries are installed in electrical equipment. Some of these small batteries have an outer can made of pure aluminum. Electricity generated by the battery is supplied to various electronic components via an external terminal attached to the pure aluminum outer can and a conductive member joined thereto.
• the conductive member is usually formed of pure nickel having excellent corrosion resistance and durability.
• the external terminal has a rectangular shape with a width of about 3 mnu and a length of about 20 m. As described in Japanese Unexamined Patent Application Publication No. 2001-6746, the external terminals are designed to take into consideration the connection with an outer can made of pure aluminum and a conductive member made of pure nickel. Then, there is an aluminum / nickel cladding material in which an aluminum layer formed of pure aluminum and a nickel layer formed of pure nickel are joined.
• a nickel sheet formed of pure nickel and an aluminum sheet formed of pure aluminum are laminated, and the laminated sheet is passed through a pair of rolls.
• the sheet is subjected to diffusion annealing, It is manufactured by diffusion bonding of a nickel layer and a nickel layer.
• the rolling reduction in cold pressure welding is set to about 60% or more so that the sheets can be joined so that they cannot be peeled off in a later step. It is also believed that high-temperature diffusion annealing generates a vulnerable AI-Ni-based intermetallic compound at the interface between the aluminum and nickel layers, degrading the peel strength between the aluminum and nickel layers. .
• diffusion annealing is usually carried out by holding at a low annealing temperature of about 400 ° C. or less for a short time so that the intermetallic compound is not generated.
• the external terminal for the battery is usually obtained by slitting the aluminum / nickel clad material into a strip having the same width as the required external terminal width along the length direction. It is manufactured by further cutting to the required length.
• the external terminal has been joined to a battery outer can by spot welding (resistance welding).
• spot welding resistance welding
• the aluminum and nickel of the clad material are melted and solidified to form an intermetallic compound, which increases the electrical resistance at the weld and reduces the efficiency of the battery.
• ultrasonic welding since the aluminum layer is pressed against the battery outer can without melting the welded portion, no intermetallic compound is generated, and a decrease in battery efficiency can be prevented.
• the present invention has been made in view of such a problem, and as a material for a battery external terminal, which is capable of obtaining stable weld bonding even when ultrasonic welding is applied, and hardly causing a shape defect even when subjected to bending, as a material thereof. It is an object of the present invention to provide a suitable aluminum / nickel clad material and a method for producing the same. Disclosure of the invention
• the inventors of the present invention have found that when ultrasonic welding is performed using external terminals for a battery made of a conventional aluminum / nickel clad material, the bondability becomes unstable. After a thorough investigation into the causes of failure, the team found that the nickel layer of the aluminum / nickel clad was too hard. Conventionally, it has been thought that the peel strength between the aluminum layer and the nickel layer is degraded if an Al-N ⁇ -based intermetallic compound is formed at the interface between the aluminum layer and the nickel layer during diffusion annealing. However, it has been found that the peel strength is rather improved in the region where the thickness of the AI—Ni-based intermetallic compound layer is particularly small. The present invention has been made based on such findings.
• the aluminum / nickel clad material of the present invention comprises an aluminum layer formed of pure aluminum having an aluminum purity of 98 mass% or more, and a pure nickel having a nickel purity of 98 mass% or more.
• the formed nickel layer is diffusion-bonded, and the hardness of the nickel layer is set to HV ⁇ 30 to 170.
• the thickness of the aluminum layer is preferably 25 to ⁇ 100 m, and the thickness of the nickel layer is preferably 50 to 200 ⁇ m.
• the hardness of the nickel layer is HV130 to 170, and the nickel layer is not excessively hard.
• the ultrasonic vibration is quickly transmitted from the ultrasonic vibration output end (horn tip) to the aluminum layer through the nickel layer, so that stable weldability can be obtained.
• good moldability can be obtained.
• the nickel layer is not excessively soft, projections (burrs) are less likely to occur on the sheared edge of the work piece when a work piece such as a battery external terminal or its material is obtained by shearing the clad material.
• the work piece does not adhere to the welding partner, making it difficult to transmit ultrasonic vibration.
• the burrs are not easily generated on the work piece, the ultrasonic vibration is quickly transmitted, and good ultrasonic weldability is obtained.
• the aluminum layer and the nickel layer have an Al— ⁇ -based metal having a thickness of 0.4 to 10. O Atm, preferably 1.0 to 6. It is desirable to perform diffusion bonding via an inter-compound layer.
• the AI—Ni-based intermetallic compound itself is brittle, but no brittleness appears in the area near the boundary between the nickel layer or aluminum layer and the intermetallic compound layer. Good bonding with the compound layer.
• the thickness of the intermetallic compound layer is about 0.4 to 10. ⁇ , the brittleness of the intermetallic compound layer itself hardly appears, so that the bonding property between the aluminum layer and the nickel layer is relatively good. is there.
• the thickness of the intermetallic compound layer is 1.0 to 6.0 m, particularly excellent bonding properties can be obtained. For this reason, even if the clad material or its work piece is subjected to severe forming processing, the aluminum layer and the nickel layer are not easily separated from each other, and excellent forming workability can be obtained.
• the aluminum / nickel clad material is suitable as a material for the battery external terminal, and the aluminum / nickel clad material is subjected to shearing such as cutting or punching with a shear to easily manufacture the battery external terminal. can do.
• the aluminum / nickel clad material is obtained by heating a nickel sheet formed of pure nickel having a nickel purity of 98 mass% or more to 100 to 300 ° C., and heating the heated nickel sheet and the aluminum sheet.
• the aluminum sheet made of pure aluminum with a purity of 98 mass% or more is overlapped and pressed at a rolling reduction of 10 to 17%, and then the obtained pressed sheet is easily annealed by diffusion annealing.
• the diffusion annealing is preferably performed in a temperature range of 500 to 600 ° C.
• the nickel layer is adjusted to have a hardness of HV130 to 170, stable welding can be performed during ultrasonic welding. Bondability is obtained, excessive springback is suppressed, and bending workability is excellent. Therefore, it is suitable as a material for external terminals for batteries and the like. Further, according to the production method of the present invention, an aluminum Z nickel clad material provided with a nickel layer having a predetermined hardness can be easily produced without requiring special equipment.
• Japan is a schematic sectional view of the aluminum / nickel clad material according to the present invention.
• FIG. 2 is an explanatory view of the procedure for measuring the bonding strength of the pressure-welded sheet and the peel strength of the clad sheet after diffusion annealing.
• Figure 3 is an explanatory diagram of the bending test procedure for aluminum / nickel clad specimens.
• FIG. 4 is an explanatory diagram of a 180 ° bending test procedure of an aluminum / nickel clad material test piece.
• BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 2, the aluminum / nickel clad material 1 according to the embodiment of the present invention has an aluminum layer 3 and a nickel layer 2 pressed together and diffusion-bonded. The hardness of the nickel layer 2 is assumed to be HVI 3 to 170.
• the aluminum layer 3 and the nickel layer 2 are made of pure aluminum and pure nickel, respectively. Although the purity of aluminum and nickel is preferably as high as possible, the present invention allows impurities up to about 2 mass%, and the purity of aluminum and nickel is 98 mass% or more, preferably 9.9 mass% or more, and more preferably 9 mass% or more. 9.9 mass% or more is preferably used.
• the hardness of the nickel layer 2 is important in the present invention, and is set to ⁇ ⁇ 30 to ⁇ 70 in Vickers hardness.
• the hardness of the nickel layer 2 has a great effect on the ultrasonic weldability, formability, etc. ⁇ ⁇ When it exceeds V170, the shape defect due to the springback during forming tends to be excessive, and the ultrasonic melting Ultrasonic waves are difficult to transmit from the nickel layer 2 to the aluminum layer 3 at the time of contact, and the welding between the aluminum layer 3 and the battery outer can becomes unstable, so that stable weldability cannot be obtained. .
• the hardness of the nickel layer 2 is set to Hv 30 to 170, preferably Hv 140 to 160.
• the aluminum layer and the nickel layer are diffusion-bonded by diffusion annealing. Along with this diffusion bonding, an AI- ⁇ ⁇ intermetallic compound may be generated at the bonding interface.
• AI — ⁇ ⁇ Intermetallic compounds themselves are fragile However, it has been considered that the peel strength between the aluminum layer and the nickel layer is reduced. However, it was found that in the region where the thickness of the AI-Ni-based intermetallic compound layer formed at the interface between the aluminum layer and the nickel layer was extremely thin, the bonding strength did not decrease, but rather improved in some cases. When the thickness of the intermetallic compound layer is about 0.4 to 10.0 tm, the peel strength is practically satisfactory. Particularly, by setting the thickness of the intermetallic compound layer to about 1.0 to 6.0 m, the peel strength becomes extremely high, It can be applied sufficiently.
• the thickness of the aluminum layer 3 is preferably from 25 to 100 °. If the aluminum layer 3 is too thin, it will be difficult to press the nickel layer 2 in the manufacturing process, while if it is too thick, it will be difficult to ultrasonically weld it to the battery outer can. For this reason, it is preferably from 25 to 100 / ttm, and more preferably from about 30 to 70 Atm.
• the thickness of the nickel layer 2 is preferably 50 tm or more in order to ensure ultrasonic weldability and durability, but if it is too thick, it will only increase the cost, so it is less than 200 ⁇ m. Preferably, it is 150 m or less.
• the aluminum / nickel clad material is prepared by preparing an aluminum sheet formed of pure aluminum and a nickel sheet formed of pure nickel, and heating the nickel sheet to 100 to 300 ° C.
• the heated nickel sheet is superimposed on the aluminum sheet, and roll-pressed at a rolling reduction of 10 to 17% through a gap between the pair of rolls, whereby the obtained aluminum layer and nickel layer are bonded.
• the rolling reduction (%) is , (Thickness reduced by reduction) / (original total thickness)
• the heating temperature of the nickel sheet is lower than 100 ° C., the bonding strength with the aluminum sheet is insufficient even if the roll is pressed at a rolling reduction of 17%, which may cause peeling in a process after the pressure welding.
• the temperature exceeds 300 ° C. the lubrication of the roll at the time of pressing becomes severe, which causes poor lubrication and makes the pressing difficult.
• the heating temperature of the nickel sheet is set to 100 to 300 ° C., preferably 150 to 250 ° C. After the nickel sheet is heated to a predetermined temperature, it is desirable that the roll be pressed as quickly as possible, and that the sheet be pressed against the aluminum sheet within 5 seconds, preferably 3 seconds after heating. Recommended.
• aluminum sheets do not need to be heated in principle and can be left at room temperature. Even if it is heated, it is preferable to keep it at 200 ° C. or less. Since the rolling reduction in roll welding uses a low rolling reduction, the thickness of the aluminum sheet before rolling is necessarily reduced. For example, if the thickness of the aluminum layer of the cladding material is 25 to 1 OO Atm, the thickness of the aluminum sheet is 28 to 1111 Atm. When using aluminum sheet with a thickness of about 25 to 120 ⁇ , the aluminum sheet is heated to more than 200 ° C when the aluminum sheet is welded by pressure. The sheet will not be able to withstand the tension applied to the sheet due to the tension applied to the sheet during roll welding, causing problems such as partial elongation and breakage in severe cases. Occurs.
• the rolling reduction in the roll pressing needs to be in a very narrow range of 10 to 17%.
• the bonding strength between the aluminum sheet and the nickel sheet is about 2 N / mm or less, and sufficient bonding strength cannot be obtained, which may cause peeling.
• burrs become high and ultrasonic weldability decreases.
• the rolling reduction is set to 10 to 17%, preferably to 1 to 5%.
• the pressure-welded sheet joined by roll pressure welding becomes a clad material by diffusion bonding of the aluminum layer and the nickel layer by diffusion annealing.
• the peel strength between the aluminum layer and the nickel layer in the clad material varies depending on the diffusion annealing conditions, but the peel strength of the clad material is practically required to be about 4.0 mm2 or more.
• Diffusion annealing can be performed even at 400 to 450 ° C, but in order to obtain sufficient peel strength, the annealing time is required to be 1 hr or more, and the productivity is significantly reduced. On the other hand, sufficient annealing strength can be obtained in a relatively short time of about 3 to 20 min at 500 ° C. and about 1 to 5 min at 600 ° C. The hardness of the nickel layer tends to decrease slightly due to diffusion annealing, but the degree increases as the annealing temperature increases and the annealing time increases.
• the bonding strength of the pressure-welded sheet and the peel strength of the same sheet (cladding sheet) after diffusion annealing are measured in the following manner.
• the aluminum layer 13 and the nickel layer 12 were partially peeled off at the end of the test piece 11 taken from the insulation displacement sheet, and the peeled part was bent vertically, Pull the end of the plate with a tensile tester to determine the peeling force required to peel it off. Divide the value by the width of the test piece to determine the peeling force per unit width as the bonding strength.
• the peeled part peeled off in advance is bent vertically, and the peeling force per unit width is calculated in the same manner as above, and this is defined as the peel strength.
• the aluminum Z nickel clad material manufactured as described above is slit into an appropriate width, for example, a strip having the same width as the width of the external terminal.
• the strip slit to the terminal width is sheared to the required external terminal length, or the strip stripped to a width wider than the terminal width is punched.
• the plate-shaped workpiece processed in such a manner is subjected to a forming process such as a bending process as required, and is processed into an intended shape.
• Nickel sheet with a width of 60 mm and a thickness of 50 Atm nickel nickel (nickel purity of 99.9% or more) and pure aluminum of the same width and thickness of 50 ym (aluminum purity of 99 9% or more) aluminum sheet was prepared. After heating the nickel sheet in a tunnel furnace, the aluminum sheet was overlapped with the aluminum sheet within about 2 seconds after exiting the tunnel furnace, and passed through a pair of reduction rolls. Heating temperature of nickel sheet of each sample, Table 2 shows the rolling reduction at this time.
• a test piece with a width of 100 mm and a length of 100 mm was sampled from a pressure-welded sheet where the aluminum layer and the nickel layer were pressed by roll pressing, and the bonding strength between the aluminum layer and the nickel layer was described above. Measured according to the measurement procedure. The bonding strength needs to be about 2 N / mm or more to process the subsequent steps without any problem.
• the pressure-welded sheet was subjected to diffusion annealing under the annealing conditions shown in the same table to obtain a clad material in which the aluminum layer and the nickel layer were diffusion-bonded.
• the peel strength of this clad material and the hardness of the nickel layer were measured.
• the peel strength was measured according to the measurement procedure described above using a test piece with a width of about 0 mm and a length of 100 mm, and the hardness was 0.2 kgf (1.96 N) with a Pikkas hardness tester. The load was applied and measured.
• a cross-sectional observation specimen was collected from the clad material, and the average thickness of the AI—Ni intermetallic compound layer formed between the aluminum layer and the nickel layer of the clad material was determined as follows. It was measured.
• the cross-section observation test piece is embedded in a synthetic resin so that a cross section (plate thickness cross section) along the thickness direction is set as an observation surface, and the embedded test piece is polished so that the thickness cross section is exposed. (Scanning electron microscope)
• the cross section was observed at 400 ⁇ magnification.
• the measurement results are also shown in Table 1.
• the observed intermetallic compound layer was subjected to elemental analysis by EPMA, and it was confirmed that the layer was formed by an AI-Ni-based intermetallic compound.
• the clad material was supplied and slit all at once so that the nickel layer was on the lower side, and a strip having a width of 3 mm was obtained.
• the slitter has a plurality of cutting portions each including a pair of upper and lower rotary blades, and the rotary blades cut the clad material by rotating and approaching each other so as to cross each other. Therefore, one of the cut surfaces of the cut strip is made of nickel. Burrs were formed at the lower end of the layer, and burrs were formed at the upper end of the aluminum layer on the other cut surface. The height (tm) of burrs formed at the ends of the nickel layer and the aluminum layer was measured by a surface roughness meter. If the burr height exceeds 1 ⁇ , ultrasonic weldability will be adversely affected. Therefore, the glue height shall be 10 m or less.
• the aluminum / nickel clad strip thus obtained was sheared to a length of 20 mm to obtain a welded test piece.
• the aluminum layer side surface of the welded specimen was brought into contact with a 0.5 mm pure aluminum plate (5 mm wide ⁇ 30 mm long), and the center in the width direction was ultrasonically welded.
• the welding conditions are as follows.
• Ultrasonic welding machine manufactured by Ultrasonic Industry Co., Ltd., Model U SW-2410Z15S Pressing force: 200N
• the joining strength of the weld was measured. As shown in Fig. 3, the measurement procedure was as follows: the welded test piece 21 and the pure aluminum plate 22 after welding were each bent perpendicularly at the end of the welded portion W into a U-shape, the ends were pulled, and the joint was peeled off. The tensile strength required to make the joint work was measured as the joining force. Five such measurements were performed for each sample, and the difference ⁇ F between the maximum value and the minimum value of the bonding force was determined. It is important that stable welded joints are obtained at the joints.If the above value exceeds 0.5 kgf (4.9 N), the joining stability of ultrasonic welding becomes a problem. F ⁇ 4 ⁇ 9 N is accepted.
• the above exceeds 20 °, the bending accuracy is remarkably deteriorated when performing the bending process in which the angle formed by the two sides adjacent to each other is bent to 90 °, so that the bending workability is ⁇ ⁇ ⁇ 20 °. Is passed. Table 1 shows the measurement results.
• a 180 ° bending test was performed in the following manner. As shown in Fig. 4, the test piece S was folded 180 ° around the center in the longitudinal direction so that the aluminum layer was on the inside, and then returned to the original state. The state of occurrence of local peeling between the metal and the nickel layer was visually observed. The observation results are shown in Table 1 as ⁇ ⁇ when no local peeling occurred, ⁇ when slight local peeling occurred, and ⁇ when clear local peeling occurred.
• Table 1 shows that the examples (sample Nos. 4 to 6, 10 to 13, 15 to 19, 21 and 22) in which the hardness of the nickel layer is Hvl 30 to 170 are ultrasonic. It can be seen that the weldability and bending workability are good. On the other hand, for sample Nos., ⁇ , 7, 8, and 23 in which the hardness of the nickel layer exceeds Hvl 70, there are problems with both ultrasonic weldability and bending workability. Also, since the rolling reduction is low, in Sample No. 3 in which the hardness of the nickel layer is ⁇ 120, the burr height on the aluminum layer side exceeds 10 ⁇ , and the weldability is reduced. In Samples Nos.
• Example, AI Examples in which the average thickness of the Ni-based intermetallic compound layer is ⁇ 0.0 to 6.0 Atm (Sample Nos. 4 to 6, 10 to ⁇ 3, 15, 15, 18, 2 In 1), excellent diffusion bondability was obtained with a peel strength of 8 N / mm or more after diffusion annealing. Sample Nos. 17 and 9.8 with an average thickness of 0.4 ⁇ and 17 and 9.8 m had slightly lower peel strengths of about 5 Nzmm, but the 180 ° bending test In this case, local peeling was slight, and the moldability was satisfactory without practical problems. On the other hand, in sample No. 16 in which the intermetallic compound layer was not formed and in sample No.
• Sample No. 22 having an excessive thickness, the ultrasonic weldability and bending workability were good, but the peel strength was low. Then, the degree of local peeling is large. For this reason, the cladding materials of these samples are not well suited for applications where severe forming is performed. Since the annealing time of Sample No. 20 was too long at the annealing temperature of 550 ° C, the generation of intermetallic compounds was excessive and the measurement of peel strength was impossible. Sample No. 23 corresponds to the conventional cladding material, and has a high rolling reduction at the time of pressure welding, so that it can be peeled well even at a diffusion annealing temperature of 350 ° C. Although strength was obtained, the ultrasonic weldability and bending workability deteriorated significantly due to the high hardness of the nickel layer.

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• Mechanical Engineering (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)
• Connection Of Batteries Or Terminals (AREA)

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  • 2003-08-28 AU AU2003257586A patent/AU2003257586A1/en not_active Abandoned
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  • 2003-08-28 WO PCT/JP2003/010999 patent/WO2004020191A1/ja active Application Filing
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