Soldered copper bars for IGBT modules

Abstract

A soldering copper bar for an IGBT module is used for connecting a first circuit board and a second circuit board in an IGBT module, which comprises a first soldering section for connecting the first circuit board, a second soldering section for connecting the second circuit board, and a fixed section connected between the first soldering section and the second soldering section; wherein the second soldering section has a connecting part, a plurality of mutually spaced soldering parts, and a plurality of bending parts, each of the bending parts is in a U shape and is connected between the connecting part and each of the soldering parts, so as to increase the elastic force of the soldering parts through the bending parts.

Description

Technical Field

[0001] This utility model relates to a welding copper busbar, specifically a welding copper busbar used in an IGBT module for connecting a first circuit board and a second circuit board, and capable of increasing elasticity. Background Technology

[0002] The IGBT module in an automotive inverter is primarily used for power conversion. For example... Figures 1 to 4 As shown, the existing IGBT module A is mainly used to connect a first circuit board B and a second circuit board C, so as to electrically connect the first circuit board B and the second circuit board C to each other.

[0003] The aforementioned IGBT module A is composed of multiple welded copper busbars D and a plastic body E, so that the multiple welded copper busbars D are connected in parallel through the plastic body E. Each welded copper busbar D consists of a planar section D1 covered inside the plastic body E, a first welded section D2 protruding on one side of the plastic body E, and a second welded section D3 protruding on the other side of the plastic body E. The second welded section D3 consists of a connecting part D31 and multiple welded parts D32. A bending part D33 is formed between each welded part D32 and the connecting part D31 so that a height difference is formed between each welded part D32 and the connecting part D31.

[0004] Each of the welding copper busbars D has a first welding section D2 for welding onto the first circuit board B, and each welding part D32 for welding onto the second circuit board C. When the first welding sections D2 and the welding parts D32 are welded onto the first circuit board B and the second circuit board C respectively, multiple pressing heads F are used to press the first welding sections D2 and the welding parts D32 against each other to ensure that the first welding sections D2 and the welding parts D32 can be reliably pressed against the first circuit board B and the second circuit board C to facilitate the welding operation.

[0005] However, the existing welded copper busbar D, when pressed by the rivet heads F, is prone to deformation due to the different horizontal positions of the first welding sections D2 and each welding part D32, or insufficient extension of the first welding sections D2 and the second welding sections D3 beyond the plastic body E, resulting in insufficient elasticity of the welded copper busbar D. Therefore, after the rivet heads F press, each welded copper busbar D is deformed, resulting in poor welding after welding, such as incomplete welding, empty welding, deformation of the plastic body E, and even problems such as charring and carbonization of the plastic body E due to excessive heating time.

[0006] Therefore, the problem to be solved by this utility model is how to provide a welding copper busbar that can increase elasticity while avoiding deformation during the welding process. Utility Model Content

[0007] The main objective of this invention is to provide a welding copper busbar for connecting a first circuit board and a second circuit board within an IGBT module, which can increase elasticity.

[0008] To achieve the above objectives, the present invention provides a welding copper busbar for connecting a first circuit board and a second circuit board within an IGBT module. The welding copper busbar includes a first welding section for connecting the first circuit board, a second welding section for connecting the second circuit board, and a fixed section connecting the first welding section and the second welding section. The second welding section has a connecting portion, a plurality of spaced-apart welding portions, and a plurality of bends. Each bend is U-shaped and connects the connecting portion to each welding portion, thereby increasing the elasticity of the welding portions through the bends.

[0009] In one embodiment, the first welding section has a groove.

[0010] In one embodiment, the trench extends to both ends of the first welding section.

[0011] In one embodiment, the thickness of the first welding section is less than the thickness of the fixed section.

[0012] In one embodiment, the thickness of the second welding section is less than the thickness of the fixed section.

[0013] In one embodiment, the thickness of the first welding section and the second welding section is less than the thickness of the fixed section.

[0014] The advantage of this invention over the prior art is that it increases the elasticity of the first welding section and the welded parts by setting the bent parts into a U-shape, forming the groove in the first welding section, and changing the thickness of the first welding section and the second welding section. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of an existing welded copper busbar from one perspective.

[0016] Figure 2 This is a three-dimensional schematic diagram of an existing welded copper busbar from another perspective.

[0017] Figure 3 This is a side view of an existing welded copper busbar.

[0018] Figure 4 This is a planar schematic diagram of an existing IGBT module during the welding process.

[0019] Figure 5 This is a three-dimensional schematic diagram of the welded copper busbar from one perspective in this utility model.

[0020] Figure 6 This is a three-dimensional schematic diagram of the welded copper busbar from another perspective in this utility model.

[0021] Figure 7 This is a side view of the welded copper busbar in this utility model.

[0022] Figure 8 This is an enlarged schematic diagram of the first welding section in this utility model.

[0023] Figure 9 This is an enlarged schematic diagram of the second welding section in this utility model.

[0024] Figure 10 This is a planar schematic diagram of the IGBT module in the present invention during the welding process.

[0025] [Explanation of Labels in the Attached Image]

[0026] Explanation of reference numerals in prior art

[0027] A. IGBT module;

[0028] B. First circuit board;

[0029] C. Second circuit board;

[0030] D. Welding copper busbars;

[0031] D1, Planar Section;

[0032] D2, First welding section;

[0033] D3, Second Welding Section;

[0034] D31, Connecting part;

[0035] D32, Welding section;

[0036] D33, Bending section;

[0037] E. Plastic body;

[0038] F. Riveting head.

[0039] Explanation of reference numerals in the drawings of this utility model

[0040] 10. Welding copper busbars;

[0041] 11. First welding section;

[0042] 111. Trench;

[0043] 12. Second welding section;

[0044] 121. Connecting part;

[0045] 122. Welding section;

[0046] 123. Bend;

[0047] 13. Fixed section;

[0048] 20. IGBT module;

[0049] 30. First circuit board;

[0050] 40. Second circuit board;

[0051] 50. Plastic body. Detailed Implementation

[0052] To further understand the technical means adopted by this utility model to achieve its intended purpose, preferred and feasible embodiments are described below in detail with reference to the accompanying drawings. It is believed that the purpose, features and advantages of this utility model can be understood in depth and in detail from these examples.

[0053] like Figures 5 to 10 As shown, this utility model provides a welding copper busbar 10 for connecting a first circuit board 30 and a second circuit board 40 within an IGBT module 20. The welding copper busbar 10 includes a first welding section 11, a second welding section 12, and a fixing section 13.

[0054] The first welding section 11 is used to connect the first circuit board 30, and a groove 111 is provided thereon, and the groove 111 extends to the two end edges of the first welding section 11.

[0055] The second welding section 12 is used to connect the second circuit board 40. It consists of a connecting part 121, a plurality of spaced welding parts 122 and a plurality of bending parts 123. Each bending part 123 is U-shaped and is connected between the connecting part 121 and each welding part 122.

[0056] The fixed section 13 is connected between the first welding section 11 and the second welding section 12. The fixed section 13 is used to provide a plastic body 50 so that multiple welding copper busbars 10 are connected in parallel through the plastic body 50 to form the IGBT module 20.

[0057] In this embodiment, the first welding section 11 and the second welding section 12 are thinned to make their thicknesses smaller than the thickness of the fixed section 13. By changing the thickness, the curvature of the bends 123 and the grooves 111, the elasticity of the first welding section 11 and the welded parts 122 is increased.

[0058] It is worth mentioning that when multiple welding copper busbars 10 are connected in parallel through the plastic body 50 to form the IGBT module 20, the grooves 111 and the bends 123 protrude from the outer side of the plastic body 50. When the IGBT module 20 is welded to the first circuit board 30 and the second circuit board 40 through welding operations, when the aforementioned rivet heads F press against the first welding sections 11 and the welding portions 122, the grooves 111 and the bends 123 can increase the elastic force of the welding copper busbars 10 to absorb the deformation of the first welding sections 11 and the welding portions 122, reduce the transfer of deformation positions, and make the welding copper busbars 10 fit more tightly with the first circuit board 30 and the second circuit board 40. This avoids phenomena such as open solder joints and poor solder joints during the welding process, and also prevents the deformation of the plastic body 50 and maintains a better power transmission effect with the first circuit board 30 and the second circuit board 40.

[0059] The above description and accompanying drawings are the preferred embodiments of this utility model and are not intended to limit this utility model. The scope of protection of this utility model shall be determined by the claims. All embodiments and similar structures with similar variations to the claims shall be included in this utility model.

Claims

1. A type of welded copper busbar, characterized in that, The solder busbar, used within an IGBT module for connecting a first circuit board and a second circuit board, comprises: A first soldering section is used to connect the first circuit board; A second soldering section for connecting the second circuit board, the second soldering section having a connecting portion, a plurality of spaced-apart soldering portions, and a plurality of bends, each bend being U-shaped and connected between the connecting portion and each soldering portion; and A fixed section is connected between the first welding section and the second welding section.

2. The welded copper busbar according to claim 1, characterized in that, The first welding section has a groove.

3. The welded copper busbar according to claim 2, characterized in that, The trench extends to the two end edges of the first welding section.

4. The welded copper busbar according to claim 1, characterized in that, The thickness of the first welded section is less than the thickness of the fixed section.

5. The welded copper busbar according to claim 1, characterized in that, The thickness of the second welding section is less than the thickness of the fixed section.

6. The welded copper busbar according to claim 1, characterized in that, The thickness of the first welding section and the second welding section is less than the thickness of the fixed section.

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