Special-shaped copper foil flexible connection manufacturing method

Abstract

The invention relates to a special-shaped copper foil flexible connection manufacturing method, and belongs to the technical field of copper foil flexible connection. Comprising the following steps that S1, the appearance and size of a mold are designed according to the size and shape of a product; s2, the copper foil roll material is arranged on a discharging machine for manufacturing; s3, material pretreatment; s4, a switch of the polymer diffusion welding machine is turned on, the copper strip is pressed between the two graphite flakes, it is ensured that the copper strip makes close contact with the graphite flakes, and welding of the two positions is completed; s5, checking whether undesirable phenomena such as layering, pseudo soldering and bubbles occur or not; s6, punching machining is conducted; S7, bending machining is conducted; and S8, plastic dipping processing is conducted, specifically, plastic dipping operation is conducted on the product, appearance inspection is conducted on the product after plastic dipping is completed, and warehousing treatment is conducted after packaging operation is conducted. The invention provides a special-shaped copper foil flexible connection manufacturing method which is used for solving the technical problems that in the prior art, due to the fact that pressure cannot be adjusted in the welding process, insufficient welding and infirmness are caused, and insulating treatment on exposed copper bars is lacked, the utilization rate of sheet materials is effectively increased, and therefore the machining efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of copper foil soft connection, and in particular relates to a method for manufacturing a special-shaped copper foil soft connection. Background Art

[0002] Copper foil flexible connection uses high-quality T2 copper or oxygen-free copper strip. Copper strip is also copper foil, a metal component. Copper strip is the main material for making conductive connector copper strip flexible connection products. During processing, the copper strip is cut into sections, and multiple layers are superimposed and melted by a polymer diffusion welder. For the processing of some common copper foil flexible connections, the processing technology lacks control and adjustment of the two parts to be welded during the welding process, as well as anti-insulation treatment of the exposed copper busbar.

[0003] The patent with announcement number: CN116038435A discloses an automatic copper foil welding line, including a stamping machine, a first conveyor line, a baffle arranged on one side of the first conveyor line, a lateral blowing mechanism arranged on the other side of the first conveyor line, a frame, a material receiving tool, a positioning tool arranged on the frame for positioning copper sheets and nickel-plated sheets, a weighing tool arranged on the frame, a first transfer mechanism arranged on the frame for transferring copper sheets from the material receiving tool to the weighing tool, a nickel-plated sheet feeding tool arranged on the frame, a second transfer mechanism arranged on the frame, several welding machines arranged on one side of the frame, a camera for detecting the front and back of the nickel-plated sheet, a mechanical arm for transferring the copper sheets and the nickel-plated sheet from the positioning tool to the welding machine, a finished product conveyor line arranged on one side of the several welding machines, a third transfer mechanism for transferring the finished products from the welding machine to the finished product conveyor line, and a material receiving box arranged at the end of the finished product conveyor line.

[0004] The above prior art has at least the following problems:

[0005] During the welding process, the pressure cannot be adjusted, which can easily lead to cold solder joints and unreliability, as well as lack of insulation treatment for exposed copper bars and insufficient utilization of sheet materials. Summary of the invention

[0006] The invention provides a method for making a special-shaped copper foil soft connection, which is used to solve the technical problems in the prior art that the pressure cannot be adjusted during welding, resulting in cold solder joints and unreliability, as well as the lack of insulation treatment for exposed copper bars and insufficient utilization of sheet materials.

[0007] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0008] A method for making a special-shaped copper foil soft connection comprises the following steps:

[0009] S1. Mould making: design the mould shape and size according to the product size and shape, process the special-shaped laser cutting mould, and install the processed laser cutting mould on the blanking machine.

[0010] S2. Copper foil production: Place the copper foil coil on the blanking machine, set the blanking parameters: step 56, number of sheets 12, and proceed with blanking.

[0011] S3. Material pretreatment: Use a cleaning agent to wipe the surface of the copper strip to remove surface grease, dirt and oxide impurities.

[0012] S4. Welding process: Turn on the polymer diffusion welding machine, press the copper tape between two graphite sheets, ensure that the copper tape and graphite sheets are in close contact, and complete the welding of the two positions.

[0013] S5. Screening: Check the finished products after welding to see if the sides of the welding ends of the finished products are flush, if there is any tilting, if there are any delamination, cold welding or bubbles in the welding area, and put the finished products without any defects into a clean material box.

[0014] S6. Punching: Refer to the drawing and use a punching machine to punch holes at both ends of the product, and confirm that the punching size meets the requirements of the drawing.

[0015] S7, Bending processing: refer to the drawing, use bending tooling to bend the product, and confirm that the bending size meets the requirements of the drawing

[0016] S8, plastic dipping processing: the product is processed by plastic dipping operation. After the plastic dipping is completed, the product is inspected for appearance, and after packaging, it is put into storage.

[0017] Further, the S4 includes:

[0018] S41. Welding parameter setting: Turn on the water, electricity and gas switches of the polymer diffusion welding machine, set the pressure to 0.2MPa, the current to 7KA, the temperature to 700℃, and preheat the graphite to slightly red;

[0019] S42, welding: press the copper strip tightly between two graphite sheets to ensure close contact between the copper strip and the graphite sheets, and step on the foot switch while loosening it to generate 8kA current through the copper strip and generate heat, thereby welding the copper strips together and completing the welding of two locations with a welding size of 30.

[0020] Furthermore, the welding area of ​​the copper foil in S4 has a length of 36 mm, a width of 30 mm and a length of 30 mm, a width of 28 mm, and the corresponding nickel sheet size in this area is a length of 36 mm, a width of 30 mm, a height of 0.1 mm and a length of 30 mm, a width of 28 mm, a height of 0.1 mm.

[0021] Furthermore, the polymer diffusion welding machine in S41 controls the pressure of compressed air acting on the copper strip and the nickel sheet by adjusting the gas pressure of the gas switch, thereby fixing the two parts to be welded.

[0022] Furthermore, after the welding of the two parts is completed, the gas switch is controlled to maintain the pressure for 2-3 seconds, and the welding part is wetted with water to prevent oxidation.

[0023] Furthermore, in the plastic dipping process in S8, the single-side plastic dipping thickness of the exposed copper busbar without nickel is not less than 1.5 mm.

[0024] The invention provides a method for making a special-shaped copper foil soft connection, which has the beneficial effects of reducing leakage of a finished product during use and improving the reliability of the finished product through plastic dipping treatment, and reducing cold solder joints and further improving welding quality by pressing a copper bus and a graphite sheet during welding and adjusting corresponding parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the structure of the special-shaped copper foil to be processed in an embodiment of the present invention;

[0027] Figure 2 A method for manufacturing a special-shaped copper foil soft connection is provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be welding, bolt connection, or riveting; it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] Example:

[0033] Please refer to Figure 1 and Figure 2 As shown, this embodiment provides a method for making a special-shaped copper foil soft connection, comprising the following steps:

[0034] S1. Mould making: design the mould shape and size according to the product size and shape, process the special-shaped laser cutting mould, and install the processed laser cutting mould on the blanking machine.

[0035] In step S1, the outer dimensions of the shaped copper foil to be punched are engraved on a die cutter by laser engraving. The die cutter dimensions are 350 mm long and 350 mm wide. The prepared die cutter is then installed on a special blanking machine for shaped copper foil.

[0036] S2. Copper foil production: Place the copper foil coil on the blanking machine, set the blanking parameters: step 56, number of sheets 12, and proceed with blanking.

[0037] In step S2, according to the specific size of the special-shaped copper foil, the stamping interval time of the stamping plate and the stepping distance of the receiving roller and the feeding roller for the copper material are set to 56 mm on the blanking machine, and the size of the copper strip is 0.2 mm thick and 200 mm wide, which effectively improves the utilization rate of the copper material and reduces material loss.

[0038] S3. Material pretreatment: Use a cleaning agent to wipe the surface of the copper strip to remove surface grease, dirt and oxide impurities.

[0039] S4. Welding process: Turn on the polymer diffusion welding machine, press the copper tape between two graphite sheets, ensure that the copper tape and graphite sheets are in close contact, and complete the welding of the two positions.

[0040] Step S4 also includes:

[0041] S41. Welding parameter setting: Turn on the water, electricity and gas switches of the polymer diffusion welding machine, set the pressure to 0.2MPa, the current to 7KA, the temperature to 700℃, and preheat the graphite to slightly red;

[0042] In step S41, the water switch of the spot welder is used to control the flow of cooling water. When the welding operation starts, the cooling water will stably enter the heating element of the spot welder along a specific pipe. This process can not only effectively dissipate the heat generated by the heating element during the welding process in a timely manner, thereby ensuring that the welding temperature is always within the range that the equipment can withstand, preventing the equipment from being damaged due to excessive temperature, but also effectively cool the welding part, which can avoid melting due to overheating when the copper strip and the nickel sheet are welded, thereby ensuring the smooth progress of the welding work;

[0043] The spot welding machine is equipped with a temperature sensor, whose main function is to monitor the temperature changes in the welding process in real time and accurately. Once it detects that the welding temperature exceeds the preset threshold of the device, it will quickly send this signal to the controller. After receiving the signal, the controller will control the water switch to start working, so as to achieve timely heat dissipation and cooling of the welding equipment to ensure the normal operation of the equipment;

[0044] The air switch on the welding machine is used to control the supply of compressed air. During the welding process, the compressed air can push the heating element downward, thereby applying a stable pressure of 0.2Mpa to the copper strip and the nickel sheet. Under the action of this pressure, the copper strip and the nickel sheet can achieve close contact, reducing problems such as cold solder joints caused by poor contact, which is one of the key factors to ensure welding quality. On the other hand, compressed air can also effectively remove impurities and air that may exist between the copper strip and the nickel sheet, making the welding area purer and further improving the quality of welding.

[0045] S42, welding: press the copper strip tightly between two graphite sheets to ensure close contact between the copper strip and the graphite sheets, and step on the foot switch while loosening it to generate 8kA current through the copper strip and generate heat, thereby welding the copper strips together and completing the welding of two locations with a welding size of 30.

[0046] In step S42, the welding part is heated by an electric switch until the welding temperature is reached, and the welding of the equipment is completed. After completion, the welding part is isolated with water to prevent oxidation.

[0047] S5. Screening: Check the finished products after welding to see whether the sides of the welding ends of the finished products are flush, whether there is any tilting, whether there are any delamination, cold welding and bubbles in the welding area, and place the finished products without any defects in a clean material box.

[0048] In step S5, the welds are inspected and marked by visual inspection, and finally the welded products are screened.

[0049] S6. Punching: Refer to the drawing and use a punching machine to punch holes on both ends of the product, and confirm that the punching size meets the requirements of the drawing.

[0050] S7. Bending processing: refer to the drawings, use bending tools to bend the product, and confirm that the bending dimensions meet the requirements of the drawings.

[0051] In step S7 , the heights of the two places after bending are 42.5 mm and 16 mm respectively.

[0052] S8, plastic dipping processing: the product is processed by plastic dipping operation. After the plastic dipping is completed, the product is inspected for appearance, and after packaging, it is put into storage.

[0053] In step S8, the burrs are removed from the bent product, and the edges are blunted to a radius of 0.5 mm. The burr-free product is subjected to high-pressure plastic dipping treatment, and the copper busbar area without nickel is plastic dipping, so that the single-layer insulation protection thickness is not less than 1.5 mm, and in the withstand voltage test, it is necessary to achieve a leakage current of less than 1 mA under the condition of 2500V AC per minute; in the insulation test, it is necessary to achieve an insulation resistance greater than 500MΩ under the condition of 1000V DC.

[0054] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for making a special-shaped copper foil soft connection, characterized in that: The steps include: S1. Mould making: design the mould shape and size according to the product size and shape, process the special-shaped laser cutting mould, and install the processed laser cutting mould on the blanking machine; S2. Copper foil production: Place the copper foil coil on the blanking machine, set the blanking parameters: step 56, number of sheets 12, and proceed with blanking; S3. Material pretreatment: Use a cleaning agent to wipe the surface of the copper strip to remove surface grease, dirt and oxide impurities; S4, welding process: turn on the polymer diffusion welding machine, press the copper belt between two graphite sheets, ensure that the copper belt and graphite sheets are in close contact, and complete the welding of the two positions; S5. Screening: Check the finished products after welding to see whether the sides of the welding ends of the finished products are flush, whether there is any tilting, whether there are any delamination, cold welding and bubbles in the welding area, and place the finished products without any defects in a clean material box; S6. Punching: Refer to the drawing and use a punching machine to punch holes at both ends of the product, and confirm that the punching size meets the requirements of the drawing; S7, Bending processing: refer to the drawing, use bending tooling to bend the product, and confirm that the bending size meets the requirements of the drawing; S8, plastic dipping processing: the product is processed by plastic dipping operation. After the plastic dipping is completed, the product is inspected for appearance, and after packaging, it is put into storage.

2. The method for making a special-shaped copper foil soft connection according to claim 1, characterized in that: The S4 includes: S41. Welding parameter setting: Turn on the water, electricity and gas switches of the polymer diffusion welding machine, set the pressure to 0.2MPa, the current to 7KA, the temperature to 700℃, and preheat the graphite to slightly red; S42, welding: press the copper strip tightly between two graphite sheets to ensure close contact between the copper strip and the graphite sheets, and step on the foot switch while loosening it to generate 8kA current through the copper strip and generate heat, thereby welding the copper strips together and completing the welding of two locations with a welding size of 30.

3. The method for making a special-shaped copper foil soft connection according to claim 2, characterized in that: The welding area of ​​the copper foil in S4 is 36mm in length, 30mm in width and 30mm in length, 28mm in width, and the corresponding nickel sheet sizes are 36mm in length, 30mm in width, 0.1mm in height and 30mm in length, 28mm in width, 0.1mm in height.

4. The method for making a special-shaped copper foil soft connection according to claim 2, characterized in that: The polymer diffusion welding machine in S41 controls the pressure of compressed air acting on the copper strip and the nickel sheet by adjusting the gas pressure of the gas switch, thereby fixing the two parts to be welded.

5. The method for making a special-shaped copper foil soft connection according to claim 4, characterized in that: After welding the two parts, control the gas switch to maintain pressure for 2-3 seconds, and apply water to the welding area to prevent oxidation.

6. The method for making a special-shaped copper foil soft connection according to claim 1, characterized in that: In the plastic dipping process in S8, the single-side plastic dipping thickness of the exposed copper busbar without nickel is not less than 1.5 mm.

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