Electrically conductive aluminum alloy plate and method for manufacturing same

Abstract

Provided is an electrically conductive aluminum alloy plate having excellent stress relaxation characteristics and bending workability without compromising electrical conductivity, and a method for manufacturing said plate. The electrically conductive aluminum alloy plate is composed of an aluminum alloy containing 0.3-1.5% of Si and 0.3-1.0% of Mg (percentages given with respect to mass), the balance comprising Al and inevitable impurities. Intermetallic compounds in which the average crystal grain size in the rolling direction of the plate surface is 150 Mum or less and the maximum length exceeds 3 Mum are present in the plate surface in a concentration of 1500 / mm2 or less.

Description

technical field [0001] The present invention relates to busbars for electrical connection between electrical equipment (battery packs, transformers, motors, etc.) mounted on electric vehicles and various electric transportation machines that use electricity as a power source, or between components inside electrical equipment. An aluminum alloy plate for electric conduction of an electrical connection element and a manufacturing method thereof. Background technique [0002] Various electrical equipment such as battery packs, transformers, and motors are mounted on various electric transportation machines (hybrid vehicles, fuel cell vehicles, electric locomotives, etc.) that use electricity as a power source including electric vehicles. In addition, when electrically connecting between these electric devices or between elements inside the electric devices, an electric connection element called a bus bar (bus-bar) is used. [0003] When the bus bar is connected by a connecting...

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Problems solved by technology

[0018] However, the technology disclosed in Patent Document 1 focuses on improving creep resistance, but it does not consider stress relaxation characteristics and bending workability at all (see paragraph 0010 of Patent Document 1, etc. ), especially the bending workability required for electrical connection components

Therefore, when the technique disclosed in Patent Document 1 is applied to an electrical connection element, there is a possibility that the surface may be cracked during forming.

[0019] In addition, although the technique disclosed in Patent Document 2 focuses on the improvement of bending workability, it does not consider stress relaxation characteristics at all (see paragraph 0001 of Patent Document 2, etc.). Meet the stress relaxation characteristics required for electrical connection components

Therefore, when the technique disclosed in Patent Document 2 is applied to an electrical connection element, the connection portion 1a of the bus bar 1 (electrical connection element 1 ) will be damaged due to the heat generated at the time of energization (refer to figure 1 ) is deformed, so that there is a possibility that the connection part 1a is detached from the element

[0020] In addition, the technologies disclosed in Patent Documents 3 and 4, like Patent Document 2, consider bending workability, but do not consider stress relaxation characteristics at all, and are not used for electrical connection elements. Conductive use, but the technology used in automotive panels

Therefore, the technologies disclosed in Patent Documents 3 and 4 cannot satisfy the stress relaxation characteristics required for connecting elements.

[0021] Furthermore, from the descriptions of Patent Documents 1 to 4, it can be seen that there is no technology for combining the stress relaxation characteristics and bending workability required for electrical connection elements in aluminum alloy sheets.

[0022] In addition, the actual situation is considered to be in line with technical common sense (in order to improve the stress relaxation characteristics of the plate material made of metal, it is necessary to increase the strength, but if the strength is increased, the bending workability of the plate material will decrease, that is, Stress relaxation characteristics and bending workability are in a trade-off relationship)

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