Cu-Zn alloy strip for tab material for connecting cells

A technology of alloy bar and cu-zn, which is applied in the direction of battery pack parts, circuits, electrical components, etc., can solve the problems of insufficient weldability and repeated bending, and achieve good repeated bending and weldability

Inactive Publication Date: 2012-12-05
JX NIPPON MINING & METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the weldability and repeated bending properties of Cu-Ni-Sn alloys are insufficient, and improvement is expected

Method used

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  • Cu-Zn alloy strip for tab material for connecting cells
  • Cu-Zn alloy strip for tab material for connecting cells
  • Cu-Zn alloy strip for tab material for connecting cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0056] Electrolytic copper is melted in a high-frequency furnace, the surface of the molten metal is coated with charcoal, and alloying elements are added to adjust the molten metal to the desired composition. Cast at a casting temperature of 1200°C, heat the obtained ingot at 850°C for 3 hours, then roll to a plate thickness of 8mm, and adjust the hot rolling end temperature to be above 650°C so that the final rolling pass of hot rolling The processing degree is 35%. Remove the oxide scale generated on the surface by turning the plane. Subsequently, it is processed to a plate thickness of 1.5 mm by cold rolling, intermediate annealing is carried out at 700 ° C for 12 seconds, and then cold rolled to 0.35 mm, adjusted so that the final rolling pass and the previous rolling pass of the final rolling pass The average processing degree is 35%, and the rolling speed of the final rolling pass and the previous rolling pass of the final rolling pass is 250m / min. After this cold rol...

Embodiment 2）

[0058] Electrolytic copper was melted in a high-frequency furnace, and the surface of the molten metal was coated with charcoal. Then, Zn and Sn were added to the molten metal and the components were adjusted to a composition of 8.0% Zn, 0.30% Sn, and Cu. Casting was performed at a casting temperature of 1200°C. The obtained ingot was heated at 900° C. for 3 hours, then hot-rolled to produce a copper alloy plate with a thickness of 8 mm, and the oxide scale formed on the surface was removed by lathing. Subsequently, cold rolling was performed to a plate thickness of 1.5 mm, and after performing intermediate annealing, cold rolling was performed to a plate thickness of 0.25 mm. Furthermore, final annealing was performed, and the copper alloy plate after the final annealing was cold-rolled and finished into a 0.15 mm plate. The intermediate annealing and final annealing were performed using a continuous line in an ammonia decomposing gas atmosphere. Table 2 shows the condition...

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PUM

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Abstract

Provided is a Cu-Zn alloy strip which is a copper alloy containing 2-12 mass% Zn, with the remainder comprising Cu and incidental impurities, and in which the frequency of twin-crystal boundaries is 40-70%. The alloy strip has satisfactory resistance to repeated flexing and satisfactory weldability and is suitable for use as a tab material for connecting rechargeable cells. The alloy strip may further contain 0.1-0.8 mass% Sn, and may have an aspect ratio of 0.3-0.7 in terms of aspect ratio between crystal grain diameter in the direction parallel to the rolling direction and crystal grain diameter in a direction perpendicular to the rolling direction. The alloy strip may further contain at least one of Ni, Mg, Fe, P, Al, and Ag in a total amount of 0.005-0.5 mass%. Also provided is a Sn-plated Cu-Zn alloy strip which is obtained by plating the Cu-Zn alloy with Sn in a thickness of 0.3-2 [mu]m.

Description

technical field [0001] The present invention relates to a Cu-Zn alloy strip used as a battery joint material. Background technique [0002] Rechargeable batteries such as nickel-cadmium batteries and lithium batteries are used in portable electronic devices such as video cameras. In addition, due to the reduction of environmental load in recent years, the demand for electric vehicles and hybrid vehicles has also increased, and lithium-ion secondary batteries for vehicles are also being developed. In order to secure the required capacity of these rechargeable batteries, a plurality of batteries with a single structure are electrically connected and used in a state of being close to each other. Metal parts used for connecting batteries are called collector tabs or tabs, and are often welded to electrodes of batteries by resistance welding using resistance heat generation for reliable connection. In order to accommodate multiple batteries with terminals welded to the electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04C22F1/08C25D7/00H01M2/26C22F1/00C22F1/02H01M50/533H01M50/534H01M50/536
CPCY02E60/12C25D7/0614C22C9/04C22F1/08C25D7/00H01M2/26Y02E60/10H01M50/534H01M50/536H01M50/533C22F1/02
Inventor 前田直文
Owner JX NIPPON MINING & METALS CO LTD
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