Aluminum alloy plate for bus bars, which has excellent laser weldability

A laser welding, aluminum alloy plate technology, applied in conductive connection, small-sized batteries/batteries, batteries, etc., can solve the problems of shallow penetration depth, lack of joint strength, cracks, etc., and achieve excellent bending workability , The effect of excellent laser weldability and high electrical conductivity

Inactive Publication Date: 2018-07-31
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, when laser welding aluminum materials, the penetration depth is shallow, the required joint strength cannot be obtained, or abnormal parts of the weld bead occur locally (for example, refer to Japanese Patent Application Publication No. 2009-287116, Japanese Patent Application Publication No. 2013 -087304 Bulletin) etc.
In addition, depending on the composition of the aluminum material and the degree of bending processing, surface roughness and cracks may occur in the bent part

Method used

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  • Aluminum alloy plate for bus bars, which has excellent laser weldability
  • Aluminum alloy plate for bus bars, which has excellent laser weldability
  • Aluminum alloy plate for bus bars, which has excellent laser weldability

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Effect test

Embodiment 1

[0040] Hereinafter, examples in which the effects of the present invention were confirmed are compared with comparative examples that do not satisfy the requirements of the present invention, and are specifically described. In addition, this invention is not limited to this Example.

[0041] Aluminum alloys (Nos. 1 to 28) having the compositions shown in Table 1 were melted and cast to produce ingot slabs, and face cutting was performed. The cooling rate during casting was 0.4°C / sec. This slab was subjected to a homogenization treatment at 570° C., and then hot-rolled to obtain a hot-rolled sheet having a thickness of 5 mm. Thereafter, cold rolling was implemented to produce a cold-rolled sheet having a thickness of 2 mm. This cold-rolled sheet was further annealed at 350°C to be an O material (annealed material) of the aluminum alloy sheet.

[0042] 【Table 1】

[0043]

[0044] *Deviating from the provisions of the present invention

[0045] For each aluminum alloy pla...

Embodiment 2

[0068] An aluminum alloy having a composition of No. 2 in Table 1 was melted and cast at various cooling rates shown in Table 3 to produce ingot slabs. For this slab, a cold-rolled sheet with a thickness of 2 mm was produced under the same manufacturing process and conditions as in Example 1, and then annealed at 350° C. to obtain an O material (annealed material) of the aluminum alloy sheet.

[0069] For the aluminum alloy plates (No. 2-1 to 2-5) shown in Table 3, the number density, electrical conductivity, and bending workability of intermetallic compounds with a maximum length of 2 μm or more were measured in the same manner as in Example 1. . The results are shown in Table 3.

[0070] 【table 3】

[0071]

[0072] As shown in Table 3, No. 2-2 and No. 2-3 whose cooling rate was in the range of 0.1 to 1.0°C / sec during casting had the number density of intermetallic compounds within the range specified in the present invention, and were electrically conductive. Good prop...

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PUM

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Abstract

This aluminum alloy plate for bus bars contains Si, Fe, Ti and B respectively in specific amounts, with the balance being made up of Al and unavoidable impurities. With respect to this aluminum alloyplate for bus bars, the number density of intermetallic compounds having maximum lengths of 2 mum or more is 400-1500 compounds / mm2 in a cross-section of 1 / 4 of the plate thickness; and the electricalconductivity is 58-62% IACS.

Description

technical field [0001] The present invention relates to, for example, an aluminum alloy plate for a bus bar used in a bus bar of an automobile, and particularly relates to an aluminum alloy plate for a bus bar excellent in laser weldability. Background technique [0002] Lightweight aluminum materials have been studied as bus bars for electrically connecting external terminals of lithium-ion secondary batteries of automobiles and the like. [0003] Patent Document 1 describes that external terminals of different polarities of a rectangular secondary battery such as a lithium ion secondary battery are connected by a bus bar made of an aluminum material. The busbars made of aluminum are welded to the external terminals made of aluminum by laser welding or electron beam welding. [0004] Patent Document 2 describes a bus bar made of an aluminum material for connecting positive and negative terminals of a secondary battery such as a lithium ion secondary battery. The busbar is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22F1/00C22F1/04H01M2/20H01M50/528H01M50/50H01M50/505H01M50/522
CPCC22C21/00C22F1/04H01M2220/20Y02E60/10H01M50/522H01M50/50H01M50/505H01M50/502H01M50/528H01M50/543
Inventor 小林一德
Owner KOBE STEEL LTD
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