Soldering lug for welding power module

A technology for power modules and solder tabs, which is used in welding media, welding equipment, welding/cutting media/materials, etc., can solve problems such as excessive temperature, and achieve the effects of good heat conduction, enhanced heat dissipation, and high heat dissipation efficiency.

Inactive Publication Date: 2016-05-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a welding piece for power module welding, which can improve the problem of excessive temperature in a local area on the chip and ensure the service life

Method used

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  • Soldering lug for welding power module
  • Soldering lug for welding power module
  • Soldering lug for welding power module

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Embodiment Construction

[0022] A solder sheet for power module welding, comprising a metal mesh skeleton 6.3.2, and brazing materials are filled in the meshes of the metal mesh skeleton 6.3.2. In this embodiment, the metal mesh skeleton is a metal material including copper Cu, silver Ag, gold Au or alloys with a liquidus temperature greater than 450°C, and the thermal conductivity of the metal material is better than that of ordinary solder The thermal conductivity of the solder sheet; the brazing material is a brazing material with a liquidus temperature between 150°C and 450°C, including tin Sn, tin-lead alloy, and tin-lead-silver alloy; the thickness of the solder sheet is 80 μm to 110 μm , wherein, the mesh skeleton metal material (6.3.2) is consistent with the thickness of the solder sheet, and the brazing material is filled to 98% to 99% of the mesh inner space.

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the specific implementation...

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Abstract

The invention discloses a soldering lug for welding a power module. The soldering lug comprises a metal net framework, wherein a mesh space of the metal net framework is filled with a braze welding material. A liquid phase line temperature of the metal net framework is much greater than a braze welding temperature, and therefore, in a reflow soldering process, the braze welding material is firstly molten to be a liquid state; the mesh space is filled up with 98%-99% of the molten braze welding material; and the metal net framework provides an attachment boundary for the braze welding material in the liquid state, so that the metal net framework and the brake welding material form a plane-like structure. A chip on the soldering lug is uniform in stress at each area, so that displacement in a tangential direction and a normal direction does not occur easily, the length from each area on the power chip to a radiating path of a bottom plate below the power chip is consistent, and thermal resistance is more uniform accordingly, so that the condition that the temperature of the local area of the power chip is too high can be avoided.

Description

technical field [0001] The invention relates to a welding sheet for power module welding, in particular to improving the structural combination of the welding sheet. By using the improved soldering piece, the problem of excessive temperature in a local area on the module chip is better suppressed, the aging speed of the module is delayed, and the service life is improved. Background technique [0002] With the development and improvement of high-power semiconductor technology, power devices have been widely used in various fields of electronic engineering. Compared with discrete devices, power modules have obvious advantages in motor systems, especially in pure electric and hybrid vehicles, due to their advantages of low power consumption, low cost, and high reliability. [0003] However, since the number of connected components of the power module is more than that of discrete devices, the number of welding layers of the power module is large, and the welding quality at th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/24B23K35/28H01L23/367
CPCB23K35/24B23K35/28H01L23/367H01L2224/32225
Inventor 刘斯扬魏家行王宁宋海洋叶然孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV
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