Copper-aluminum composite plate strip

Abstract

The utility model relates to the field of copper-aluminum composite plate strip, especially a copper-aluminum composite plate strip. The copper-aluminum composite plate strip is formed by profiled copper strip and semi-molten aluminum composite rolling, the cross section of the profiled copper strip is polygonal, the bottom edge of the first closed shape is arranged on the top edge of the inverted trapezoid, and the top edge of the first closed shape is shorter than the bottom edge. The advantages include stable molten aluminum liquid level during compounding.

Description

Technical Field

[0001] This utility model relates to the field of copper-aluminum composite plates and strips, and in particular to a copper-aluminum composite plate and strip. Background Technology

[0002] Copper-aluminum composite strips with beveled surfaces are commonly used components in the battery industry. These composite strips can be produced by rolling copper strip with semi-molten aluminum. Current technology typically uses trapezoidal copper strip as the rolling blank. After surface processing, the rolled composite strip is made into a composite strip with an isosceles trapezoidal copper strip in the middle. The strip is then cut along its length to produce two finished products, each containing copper strip with a right-angled trapezoidal cross-section.

[0003] If the trapezoidal copper strip is placed upright (i.e., the cross-section is a regular trapezoid), the molten aluminum is prone to spilling onto the copper during rolling, resulting in an unstable aluminum surface and unstable composite. The trapezoidal copper strip is placed upside down (i.e., the cross-section is an inverted trapezoid), which prevents the molten aluminum from easily spilling onto the copper surface. This is a commonly used technical solution. However, during casting and rolling, the upper part of the inverted trapezoidal copper strip deforms relatively quickly (the copper strip needs to deform rapidly to its final position during rolling to prevent the temperature of the semi-molten aluminum from dropping too much), and the stability of the aluminum surface is still not high enough.

[0004] Therefore, this technology needs improvement. Utility Model Content

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a copper-aluminum composite plate and strip, which has the advantage of stable aluminum liquid level during the composite process.

[0006] The technical solution adopted by this utility model to solve the problem is: A copper-aluminum composite strip includes a first aluminum strip and a first copper strip. The first copper strip is in the shape of an inverted trapezoid. The copper-aluminum composite strip is formed by composite rolling of a shaped copper strip and semi-molten aluminum. The cross-section of the shaped copper strip is polygonal. The bottom edge of the first closed shape is located at the top edge of the inverted trapezoid, and the top edge of the first closed shape is shorter than its bottom edge.

[0007] As a preferred technical solution, the bottom of the inverted trapezoid is provided with a downwardly protruding arc-shaped second protrusion, the middle thickness of the second protrusion is T4, and the range of T4 is 0-6mm.

[0008] As a preferred technical solution, the first closed shape is a trapezoid, and the top of the first closed shape is provided with an upwardly protruding first protrusion. The thickness of the middle part of the first protrusion is T3, and the range of T3 is 0-6mm.

[0009] As a preferred technical solution, the thickness of the irregularly shaped copper strip is T, and the range of T is 5-15mm.

[0010] As a preferred technical solution, the width of the base of the inverted trapezoid is W, and the range of W is 5-200mm.

[0011] As a preferred technical solution, the top edge width of the first closed shape is W1, and the width of W1 is 5-200mm.

[0012] As a preferred technical solution, the height difference between the upper left vertex and the lower left vertex of the first closed shape is T1, and the range of T1 is 3-13mm; the height difference between the upper right vertex and the lower right vertex of the first closed shape is T2, and the range of T2 is 3-10mm.

[0013] As a preferred technical solution, the lateral position difference between the upper left vertex and the lower left vertex of the first closed shape is W2, and the range of W2 is 3-20mm; the lateral position difference between the upper right vertex and the lower right vertex of the first closed shape is W3, and the range of W3 is 3-20mm.

[0014] The copper-aluminum composite strip is formed by composite rolling of the shaped copper strip and semi-molten aluminum. The thickness of the copper-aluminum composite strip is T10, ranging from 5 to 13 mm. The first copper strip is inverted trapezoidal, with a thickness of T11, ranging from 3 to 12 mm. The top edge width of the first copper strip is W10, ranging from 11 to 240 mm. The bottom edge width of the first copper strip is W11, ranging from 5 to 200 mm. The lateral distance between the upper left and lower left vertices of the first copper strip is W12, ranging from 3 to 20 mm. The lateral distance between the upper right and lower right vertices of the first copper strip is W13, ranging from 3 to 20 mm.

[0015] The beneficial effects of this utility model are: The shaped copper strip is used to roll copper-aluminum composite strip. The aluminum used in the rolling process can be semi-molten aluminum commonly used in the prior art. Because the shaped copper strip has a first closed shape, the middle of the copper strip is compressed during the rolling process, and the contact area between the copper strip and the semi-molten aluminum material increases uniformly and slowly. The lower part and the liquid surface of the semi-molten aluminum material flow more uniformly, which can reduce the disturbance of the liquid surface of the semi-molten aluminum material during the casting and rolling process. If the copper strip used is thin, the aluminum molten material level will not be high whether the trapezoidal copper strip is placed upright or upside down. However, when the copper strip is thicker, for example, greater than 3mm, if a copper strip blank with an inverted trapezoidal cross-section is used, a higher semi-molten aluminum molten material level is required to ensure rapid copper-aluminum bonding and guarantee bonding quality. However, a higher semi-molten aluminum molten material level can lead to instability, thereby reducing the local bonding quality. By setting a second protrusion, in step S2, the bottom of the copper strip blank can contact the semi-molten aluminum material immediately, achieving rapid contact between the copper strip blank and the semi-molten aluminum material. This can replace the solution of "raising the semi-molten aluminum molten material level" without causing instability in the semi-molten aluminum molten material level. At the same time, during the process of the copper strip blank being thinned, deformation occurs in its middle and at both ends, and the deformation is relatively uniform, rather than the deformation being concentrated at the two vertices of the inverted trapezoid, thus improving the stability of the semi-molten aluminum molten material level. Attached Figure Description

[0016] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 A cross-sectional view of the irregularly shaped copper strip and a schematic diagram of the deformation of the irregularly shaped copper strip during casting and rolling, which are preferred embodiments of this utility model. Figure 2 Side view of semi-molten aluminum material, shaped copper strip, upper roller and lower roller; Figure 3 A partially enlarged front view of the semi-molten aluminum material, the shaped copper strip, the upper roller, and the lower roller; Figure 4 This is a cross-sectional view of the copper-aluminum composite strip.

[0018] In the diagram: 1-semi-molten aluminum material, 2-irregular copper strip, 3-copper-aluminum composite strip, 4-first aluminum strip, 5-first copper strip, 12-upper roller, 13-lower roller. Detailed Implementation

[0019] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Reference Figures 1 to 4 A copper-aluminum composite strip, comprising a first aluminum strip 4 and a first copper strip 5, wherein the first copper strip 5 is in the shape of an inverted trapezoid, and the copper-aluminum composite strip is formed by composite rolling of a shaped copper strip 2 and semi-molten aluminum, wherein the cross-section of the shaped copper strip 2 is polygonal, and the bottom edge of the first closed shape is located at the top edge of the inverted trapezoid, wherein the top edge of the first closed shape is shorter than its bottom edge.

[0024] In a preferred embodiment, the bottom of the inverted trapezoid is provided with a downwardly protruding arc-shaped second protrusion, the middle thickness of the second protrusion is T4, and the range of T4 is 0-6mm.

[0025] In a preferred embodiment, the first closed shape is a trapezoid, and the top of the first closed shape is provided with an upwardly protruding first protrusion. The thickness of the middle part of the first protrusion is T3, and the range of T3 is 0-6mm.

[0026] In a preferred embodiment, the thickness of the irregular copper strip 2 is T, and the range of T is 5-15 mm.

[0027] In a preferred embodiment, the width of the base of the inverted trapezoid is W, and the range of W is 5-200mm.

[0028] In a preferred embodiment, the top edge width of the first closed shape is W1, and the width of W1 is 5-200mm.

[0029] In a preferred embodiment, the height difference between the upper left vertex and the lower left vertex of the first closed shape is T1, and the range of T1 is 3-13mm; the height difference between the upper right vertex and the lower right vertex of the first closed shape is T2, and the range of T2 is 3-10mm.

[0030] In a preferred embodiment, the lateral position difference between the upper left vertex and the lower left vertex of the first closed shape is W2, and the range of W2 is 3-20mm; the lateral position difference between the upper right vertex and the lower right vertex of the first closed shape is W3, and the range of W3 is 3-20mm.

[0031] During rolling, the semi-molten aluminum material 1 and the shaped copper strip 2 are both located between the upper roll 12 and the lower roll 13. The thickness of the copper-aluminum composite strip is T10, which ranges from 5 to 13 mm. The first copper strip 5 is inverted trapezoidal, and its thickness is T11, which ranges from 3 to 12 mm. The top edge width of the first copper strip 5 is W10, which ranges from 11 to 240 mm. The bottom edge width of the first copper strip 5 is W11, which ranges from 5 to 200 mm. The lateral distance between the upper left and lower left vertices of the first copper strip 5 is W12, which ranges from 3 to 20 mm. The lateral distance between the upper right and lower right vertices of the first copper strip 5 is W13, which ranges from 3 to 20 mm.

[0032] The copper-aluminum composite strip of this utility model is made using the aforementioned irregularly shaped copper strip. The preparation steps include: Step S1, melting aluminum ingots and pouring them into a preheated casting nozzle, cooling and crystallizing the cast aluminum liquid to a semi-molten state to obtain a semi-molten aluminum material 1; Step S2, contacting the surface of the semi-molten aluminum material 1 with the surface of the irregularly shaped copper strip 2, and performing continuous casting and rolling to obtain a copper-aluminum composite strip 3; The copper-aluminum composite strip 3 includes a first aluminum strip 4 and a first copper strip 5, the bottom surface and the left and right sides of the first copper strip 5 are connected to the first aluminum strip 4; In Step S2, the cross-section of the irregularly shaped copper strip 2 is polygonal, the bottom edge of the first closed shape is located at the top edge of the inverted trapezoid, and the top edge of the first closed shape is shorter than its bottom edge.

[0033] The principle of this invention is that, since the cross-section of the irregularly shaped copper strip 2 also includes an upper first closed shape, which is thicker in the middle and thinner at the edges, when the irregularly shaped copper strip 2 is deformed under pressure, the lower end point and the left and right end points move outward evenly. Figure 1 As shown, this is to reduce disturbance to the surface of the semi-molten aluminum material.

[0034] During the casting and rolling process in step 2, the first protrusion is stressed first, that is, the middle part of the irregular copper strip 2 is stressed first, which can ensure smooth outward extension on both sides.

[0035] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A copper-aluminum composite strip, comprising a first aluminum strip (4) and a first copper strip (5), the first copper strip (5) being inverted trapezoidal, the copper-aluminum composite strip being formed by composite rolling of shaped copper strip (2) and semi-molten aluminum, characterized in that: The cross-section of the irregular copper strip (2) is polygonal, and the cross-section of the irregular copper strip (2) also includes a first closed shape at the top. The bottom edge of the first closed shape is located at the top edge of the inverted trapezoid, and the top edge of the first closed shape is shorter than its bottom edge.

2. The copper-aluminum composite plate and strip as described in claim 1, characterized in that: The bottom of the inverted trapezoid is provided with a downwardly protruding arc-shaped second protrusion, the thickness of the middle part of the second protrusion is T4, and the range of T4 is 0-6mm.

3. The copper-aluminum composite plate and strip as described in claim 1, characterized in that: The first closed shape is a trapezoid, and the top of the first closed shape is provided with a first protrusion that bulges upward. The thickness of the middle part of the first protrusion is T3, and the range of T3 is 0-6mm.

4. The copper-aluminum composite plate and strip as described in claim 1, characterized in that: The thickness of the irregular copper strip (2) is T, and the range of T is 5-15 mm.

5. The copper-aluminum composite strip as described in claim 1, characterized in that: The width of the base of the inverted trapezoid is W, and the range of W is 5-200mm.

6. The copper-aluminum composite strip as described in claim 1, characterized in that: The width of the top edge of the first closed shape is W1, and the width of W1 is 5-200mm.

7. The copper-aluminum composite plate and strip as described in claim 1, characterized in that: The height difference between the upper left vertex and the lower left vertex of the first closed shape is T1, and the range of T1 is 3-13mm; the height difference between the upper right vertex and the lower right vertex of the first closed shape is T2, and the range of T2 is 3-10mm.

8. The copper-aluminum composite strip as described in claim 1, characterized in that: The lateral position difference between the upper left vertex and the lower left vertex of the first closed shape is W2, and the range of W2 is 3-20mm; the lateral position difference between the upper right vertex and the lower right vertex of the first closed shape is W3, and the range of W3 is 3-20mm.

9. The copper-aluminum composite strip as described in claim 1, characterized in that: The thickness of the copper-aluminum composite strip is T10, and the range of T10 is 5-13mm. The thickness of the first copper strip (5) is T11, and the range of T11 is 3-12mm. The top edge width of the first copper strip (5) is W10, and the width of W10 is 11-240mm. The bottom edge width of the first copper strip (5) is W11, and the width of W11 is 5-200mm. The lateral distance between the upper left vertex and the lower left vertex of the first copper strip (5) is W12, and the range of W12 is 3-20mm. The lateral distance between the upper right vertex and the lower right vertex of the first copper strip (5) is W13, and the range of W13 is 3-20mm.

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