Aluminum wire anti-sticking welding process

Abstract

The invention discloses an aluminum wire anti-sticking welding process which comprises the steps that a to-be-welded aluminum wire and a terminal are provided, and the terminal is placed in a welding area of an ultrasonic welding machine; a middle layer is arranged between an aluminum wire core of the aluminum wire and a welding head of an ultrasonic welding machine, and the middle layer is made of metal which does not react with the welding head to generate intermetallic compounds. And carrying out a welding process on the aluminum wire and the terminal through the ultrasonic welding machine. According to the scheme, adhesion between the intermetallic compound layer formed on the surface of the aluminum wire and the welding head in the welding process is avoided, and therefore the welding quality is improved.

Description

Technical Field

[0001] This application relates to the technical field of ultrasonic welding, and particularly relates to an anti-sticking welding process for aluminum wires. Background Art

[0002] Ultrasonic welding utilizes high-frequency vibration waves transmitted to the surfaces of two objects to be welded. Under pressure, the two object surfaces rub against each other to form a fusion between molecular layers.

[0003] In traditional ultrasonic welding, when welding an aluminum wire to a terminal, on the one hand, when the temperature of the aluminum reaches a certain level, intermetallic compounds (IMC) will form on the aluminum surface, resulting in adhesion between the aluminum wire and the welding head. On the other hand, when local adhesion occurs between the aluminum wire and the welding head in the welding area, it will further cause fracture between the adhesion area and the non-adhesion area. Summary of the Invention

[0004] To solve the above problems, this application provides an anti-sticking welding process for aluminum wires.

[0005] An embodiment of this application provides an anti-sticking welding process for aluminum wires, including: Providing an aluminum wire and a terminal to be welded, and placing the terminal in the welding area of an ultrasonic welding machine; Setting an intermediate layer between the aluminum wire core of the aluminum wire and the welding head of the ultrasonic welding machine, and the material of the intermediate layer is a metal that does not react with the welding head to produce intermetallic compounds; Performing a welding process on the aluminum wire and the terminal through the ultrasonic welding machine.

[0006] In some embodiments, setting the intermediate layer between the aluminum wire and the welding head of the ultrasonic welding machine includes: Setting the intermediate layer between the aluminum wire and the welding head of the ultrasonic welding machine includes: Placing the welding end of the aluminum wire between the welding head and the terminal, with the aluminum wire core of the welding end exposed; Placing the intermediate layer between the welding end of the aluminum wire and the welding head; Performing a positioning process on the intermediate layer so that the intermediate layer and the aluminum wire remain relatively stationary.

[0007] In some embodiments, performing the positioning process on the intermediate layer includes: Pre-welding the intermediate layer to the welding end of the aluminum wire.

[0008] In some embodiments, setting the intermediate layer between the aluminum wire and the welding head of the ultrasonic welding machine includes: Wrap an intermediate layer around the aluminum wire core exposed at the welding end of the aluminum wire; Place the welding end of the aluminum wire between the welding head and the terminal.

[0009] In some embodiments, providing an intermediate layer between the aluminum wire and the welding head of the ultrasonic welding machine includes: Coat the exposed aluminum wire core at the welding end of the aluminum wire with metal powder, and the metal powder forms the intermediate layer; Place the welding end of the aluminum wire between the welding head and the terminal, and the metal powder is located between the exposed aluminum wire core and the welding head.

[0010] In some embodiments, before providing an intermediate layer between the aluminum wire and the welding head of the ultrasonic welding machine, it further includes: Perform a surface micro-roughening treatment on the intermediate layer; Clean the surface of the intermediate layer.

[0011] In some embodiments, the intermediate layer is contained in the aluminum wire, and the intermediate layer is located between the aluminum wire core and the insulating layer of the aluminum wire; Providing an intermediate layer between the aluminum wire and the welding head of the ultrasonic welding machine includes: Remove the insulating layer at the welding end of the aluminum wire; Place the welding end of the aluminum wire between the welding head and the terminal, such that the exposed intermediate layer is located between the welding head and the aluminum wire core.

[0012] In some embodiments, the intermediate layer covers at least half of the continuous outer peripheral sidewall of the aluminum wire core.

[0013] In some embodiments, before performing the welding process on the aluminum wire and the terminal by the ultrasonic welding machine, it further includes: Adjust the welding parameters of the ultrasonic welding machine, including On the basis of the basic welding parameters, increase the welding energy by 10 - 30%, increase the welding power by 5 - 25%, increase the downward pressure of the welding head by 5 - 10%, and increase the amplitude by 15 - 40%; Set the vibration frequency within the range of 10 - 30 kHz; Wherein, the basic welding parameters are the welding parameters set for welding the aluminum wire and the terminal when there is no intermediate layer.

[0014] In some embodiments, it further includes: Remove the insulating layer at the welding end of the aluminum wire, and perform pre-welding pretreatment on the exposed aluminum wire core; Among them, the pre-welding pretreatment includes but is not limited to: surface cleaning, preheating treatment, chemical passivation treatment, plasma treatment, electrochemical polishing treatment, end flattening treatment, and pressing flat treatment.

[0015] In some embodiments, the end of the intermediate layer extends beyond the end of the exposed aluminum wire core, or the amount of inward contraction of the end of the intermediate layer relative to the end of the exposed aluminum wire core is less than or equal to 0.5 mm.

[0016] The technical solution of the present application has at least the following advantages: (1) By arranging an intermediate layer between the welding head and the aluminum wire to be welded, and the material of the intermediate layer is a metal that does not react with the welding head to generate intermetallic compounds, it is avoided that the intermetallic compound layer formed on the surface of the aluminum wire core during the welding process adheres to the welding head, thereby improving the welding quality; (2) A variety of ways to arrange the intermediate layer are provided, improving the universality. Description of the Drawings

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0018] Figure 1 It is a flowchart of an aluminum wire anti-sticking welding process provided by an exemplary embodiment of the present application; Figure 2 It is a schematic diagram provided by an exemplary embodiment of the present application for reflecting the relative positional relationship between the welding head, the intermediate layer and the aluminum wire; Figure 3 It is a schematic diagram provided by an exemplary embodiment of the present application for reflecting an internal structure of an aluminum wire; Figure 4 It is a schematic diagram provided by an exemplary embodiment of the present application for reflecting another internal structure of an aluminum wire; Figure 5 It is a schematic diagram provided by an exemplary embodiment of the present application for reflecting another internal structure of an aluminum wire.

[0019] Explanation of the reference numerals: 1. Aluminum wire core; 2. Insulating layer; 3. Intermediate layer; 31. Intermediate core wire; 32. Intermediate foil; 4. Aluminum foil. Specific Embodiments

[0020] Next, the technical solutions in the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0021] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can also be the communication inside two elements. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0023] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0024] The present application provides an anti-sticking welding process for aluminum wires. Referring to Figure 1 , the anti-sticking welding process for aluminum wires includes the following steps: S1: Provide the aluminum wire and the terminal to be welded, and the terminal is placed in the welding area of the ultrasonic welding machine.

[0025] Exemplarily, the terminal to be welded is placed in the welding area of the ultrasonic welding machine. In the embodiment of the present application, the moving path of the welding head of the ultrasonic welding machine is in the vertical direction. Therefore, the terminal will be placed directly below the welding head.

[0026] S2: Set an intermediate layer between the aluminum wire core of the aluminum wire and the welding head of the ultrasonic welding machine.

[0027] Among them, the material of the intermediate layer is a metal that does not react with the welding head to generate intermetallic compounds. In the embodiments of the present application, the material of the welding head is steel. Therefore, the material of the intermediate layer can be copper, silver, zinc, gold, etc. To save costs, the intermediate layer is generally set to copper.

[0028] S3: Perform a welding process on the aluminum wire and the terminal through an ultrasonic welding machine.

[0029] Exemplarily, after the welding parameters are set, use an ultrasonic welding machine to perform a welding process on the aluminum wire and the terminal.

[0030] Furthermore, in one embodiment, step S2 in the above can include the following contents: S201: Place the welding end of the aluminum wire between the welding head and the terminal.

[0031] Among them, the welding end of the aluminum wire refers to the end where the aluminum wire needs to be welded to the terminal, and the insulating layer on the surface of the welding end will be removed.

[0032] Exemplarily, place the welding end of the aluminum wire above the terminal so that it is located between the welding head and the terminal.

[0033] S202: Place an intermediate layer between the welding end of the aluminum wire and the welding head.

[0034] Exemplarily, as Figure 2 shown, place an intermediate layer above the welding end of the aluminum wire so that the intermediate layer is located between the welding end of the aluminum wire and the welding head. For example, the intermediate layer can be set as a copper sheet in the shape of a sheet. Among them, if the intermediate layer is too thin, the intermediate layer may be damaged during welding. If the intermediate layer is too thick, it will increase the welding difficulty. Therefore, in the embodiments of the present application, the thickness of the intermediate layer is set to 0.01 mm to 2 mm.

[0035] S203: Perform a positioning process on the intermediate layer so that the intermediate layer and the aluminum wire remain relatively stationary.

[0036] Exemplarily, in order to prevent the intermediate layer from moving during the welding process, a positioning process can be performed on the intermediate layer so that the intermediate layer and the aluminum wire can remain stable during the welding process.

[0037] Furthermore, step S203 can include the following processes: Pre-weld the intermediate layer to the welding end of the aluminum wire.

[0038] Exemplarily, the intermediate layer can be pre-welded to the welding end of the aluminum wire first to ensure the stable connection between the intermediate layer and the aluminum wire. After the pre-welding is completed, the excess intermediate layer outside the welding end can be removed through tools such as a cutter to avoid affecting the subsequent use of the aluminum wire.

[0039] In other embodiments, the intermediate layer can also be positioned by setting an additional positioning mechanism. For example, the positioning structure can be configured as two opposing push blocks that clamp the intermediate layer from both sides to achieve positioning of the intermediate layer.

[0040] Furthermore, in another embodiment, step S2 can also include the following: S211: Wrap an intermediate layer around the welding end of the aluminum wire.

[0041] Exemplarily, after removing the insulating layer outside the welding end of the aluminum wire, wrap an intermediate layer around the exposed aluminum wire core. Compared with placing the intermediate layer between the welding head and the aluminum wire, the wrapping method can reduce the positioning difficulty. Among them, the intermediate layer can be set as a circular copper sheet. In this embodiment, the thickness of the intermediate layer is set to 0.01 - 2 mm.

[0042] Furthermore, the end of the intermediate layer can extend beyond the end of the exposed aluminum wire core or not extend beyond the end of the exposed aluminum wire core. When the end of the intermediate layer is retracted relative to the end of the aluminum wire core, the retraction amount is less than or equal to 0.5 mm to prevent the aluminum wire core from flanging.

[0043] S212: Place the welding end of the aluminum wire between the welding head and the terminal.

[0044] Exemplarily, place the welding end of the aluminum wire wrapped with the intermediate layer between the welding head and the terminal.

[0045] Furthermore, in another embodiment, step S2 can also include the following: S221: Coat the exposed aluminum wire core at the welding end of the aluminum wire with metal powder, and the metal powder forms the intermediate layer.

[0046] Exemplarily, metal powder, such as copper powder, can be coated on the exposed aluminum wire core at the welding end of the aluminum wire to serve as the intermediate layer.

[0047] S222: Place the welding end of the aluminum wire between the welding head and the terminal, with the metal powder located between the exposed aluminum wire core and the welding head.

[0048] Exemplarily, place the welding end of the aluminum wire between the welding head and the terminal, and make the side of the exposed aluminum wire core covered with metal powder face the welding head.

[0049] Furthermore, in order to ensure good bonding between the intermediate layer and the aluminum wire and the terminal, and improve the stability and consistency of welding, in some embodiments, before setting the intermediate layer between the aluminum wire and the welding head of the ultrasonic welding machine, the intermediate layer can be processed as follows: Perform surface micro-roughening treatment on the intermediate layer and clean the surface of the intermediate layer.

[0050] Exemplarily, by performing surface micro-roughening treatment on the surface layer of the intermediate layer, the contact area between the intermediate layer and the aluminum wire and the terminal can be increased, and at the same time, the bonding strength can be improved. After that, the surface of the intermediate layer is cleaned to remove oil stains and impurities, facilitating subsequent steps. Among them, the method of surface micro-roughening treatment can be as follows: Use sandpaper to polish the surface of the intermediate layer. First, select sandpaper with a suitable grit, such as 400 - 800 mesh. After that, fix the intermediate layer on a fixture and use the sandpaper to polish the surface evenly in a single direction to avoid over-polishing. After polishing, use compressed air or a clean cloth to remove the surface dust to ensure the surface is clean.

[0051] Alternatively, sandblasting treatment can be adopted. First, select suitable abrasives, such as alumina or glass beads, with the particle size controlled within 50 - 100 microns. After that, fix the intermediate layer in a sandblasting device, adjust the sandblasting pressure and time, for example, it can be set to a pressure of 0.3 - 0.5 MPa and a time of 10 - 30 seconds, and perform sandblasting treatment. After sandblasting, rinse the surface of the intermediate layer with compressed air or clean water to remove the residual abrasives and dust.

[0052] Alternatively, chemical etching treatment can be adopted. First, prepare a chemical etching solution, such as dilute hydrochloric acid, dilute nitric acid, or sodium hydroxide solution. After that, immerse the intermediate layer in the chemical etching solution for 1 - 3 minutes, and the specific time can be adjusted according to the material properties. After that, take out the intermediate layer, rinse it with clean water and dry it to ensure the surface of the intermediate layer is clean.

[0053] Alternatively, electrochemical micro-machining treatment can be adopted. First, use the intermediate layer as the anode and perform electrochemical machining in the electrolyte for 1 - 2 minutes. After that, take out the intermediate layer, rinse it with clean water and dry it to ensure the surface is clean.

[0054] Furthermore, in other embodiments, the aluminum wire can also be pre-customized such that the intermediate layer is included in the aluminum wire and is disposed between the aluminum wire core and the insulating layer. At this time, the end of the intermediate layer can extend beyond the end of the exposed aluminum wire core or can not extend beyond the end of the exposed aluminum wire core. When the end of the intermediate layer is retracted relative to the end of the aluminum wire core, the retraction amount is less than or equal to 0.5 mm to prevent the aluminum wire core from flanging. Among them, the aluminum wire core can be obtained by stranding several aluminum core wires, and its cross-section is generally circular, and there are various ways to set the intermediate layer.

[0055] In a possible embodiment, referring to Figure 3 , at least one turn of isolation core wires is filled between the aluminum wire core 1 and the insulating layer 2. The isolation core wires include an intermediate core wire 31, such as a copper core wire, and this one turn of intermediate core wire 31 constitutes the intermediate layer 3 mentioned above.

[0056] In another possible embodiment, referring to Figure 4 , an intermediate foil 32, such as a copper foil, is isolated between the aluminum wire core 1 and the insulating layer 2. The rectangular intermediate foil 32 is rolled into a circular ring and fixedly connected to the outer peripheral side wall of the aluminum wire core 1, and the insulating layer 2 surrounds the intermediate foil 32, so that the intermediate layer 3 is formed by the intermediate foil 32. Among them, a plurality of holes can be uniformly distributed in the intermediate foil 32, thereby saving materials.

[0057] Referring to Figure 5 , an aluminum foil 4 can also be isolated between the aluminum wire core 1 and the insulating layer 2 at the same time, and the inner peripheral side wall of the insulating layer 2 is jointly covered by the aluminum foil 4 and the intermediate foil 32, and the intermediate foil 32 covers at least half of the continuous inner peripheral side wall of the insulating layer 2, so that the annular intermediate foil 32 forms the intermediate layer 3. When welding is required, the part of the aluminum wire with the intermediate foil 32 formed therein is oriented towards the welding head.

[0058] In this case, step S2 may also include the following content: S221: Remove the insulating layer at the welding end of the aluminum wire.

[0059] S222: Place the welding end of the aluminum wire between the welding head and the terminal, so that the exposed intermediate layer is located between the welding head and the aluminum wire core.

[0060] Furthermore, since an intermediate layer is provided between the aluminum wire and the welding head, in order to ensure the welding quality of ultrasonic welding, before the above step S3, the following steps may also be included: Adjust the welding parameters of the ultrasonic welding machine.

[0061] Exemplarily, on the basis of the basic welding parameters, increase the welding energy by 10 - 30%, increase the welding power by 5 - 25%, increase the downward pressure of the welding head by 5 - 10%, and increase the amplitude by 15 - 40%. Among them, the basic welding parameters are the welding parameters set when welding the aluminum wire and the terminal without setting the above intermediate layer. At the same time, set the vibration frequency within the range of 10 - 30 kHz.

[0062] Among them, the thicker the intermediate layer, the greater the welding energy, welding power, and downward pressure of the welding head set. For example, on the basis of the basic welding parameters, when the thickness of the intermediate layer increases by 0.5 mm each time, the welding energy needs to be correspondingly increased by 5 - 8%.

[0063] Furthermore, the above method may also include the following steps: Remove the insulating layer at the welding end of the aluminum wire and perform pre-welding treatment on the exposed aluminum wire core.

[0064] Among them, the pre-welding pretreatment includes at least one of, but is not limited to, surface cleaning, preheating treatment, chemical passivation treatment, plasma treatment, electro-chemical polishing treatment, end flattening treatment, etc.

[0065] For surface cleaning, methods such as chemical cleaning and mechanical cleaning can be adopted to remove the oxide layer, oil stain, dust and other impurities on the surface of the aluminum wire core, ensure the cleanliness of the welding interface, and improve the welding quality. For example, the chemical cleaning method can be used, and the aluminum wire surface can be soaked or wiped with a neutral or weakly acidic cleaning agent (such as alcohol, acetone), and then rinsed with clean water and dried. Or, the mechanical cleaning method can also be adopted, and the aluminum wire surface can be polished with sandpaper or a steel wire brush to remove the oxide layer and contaminants.

[0066] For end flattening treatment, the aluminum wire can be first cut with a high-precision wire cutting machine to ensure that the end face of the internal aluminum wire core is flat. Then, chamfering treatment is performed on the exposed aluminum wire core to reduce burrs and stress concentration, ensure that the end of the aluminum wire core is flat and burr-free, facilitate close contact with the terminal, and improve the welding effect.

[0067] For flattening treatment, since there is an arc in the length direction of the aluminum wire, it is not conducive to the placement of the intermediate layer and is likely to cause phenomena such as tilting and slipping after the intermediate layer is placed. Therefore, pre-welding or mechanical stamping processes can be adopted to flatten the aluminum wire, so that the surface of the aluminum wire for placing the intermediate layer is in a horizontal state, making it easier to fit with the intermediate layer and facilitating the alignment and placement of the intermediate layer.

[0068] For preheating treatment, preheating equipment such as a hot air gun and a preheating furnace can be used to preheat the exposed aluminum wire core. The preheating temperature can be controlled within the range of 100°C to 150°C, and the preheating duration can be controlled within the range of 1 to 2 minutes. By preheating the aluminum wire core, the weldability of the aluminum wire can be improved, and the stress problem caused by the temperature difference during the welding process can be reduced.

[0069] For chemical passivation treatment, the following treatment process can be adopted: soak the exposed aluminum wire core in a passivation solution (such as chromate or phosphate solution) for 5 to 10 minutes to form a dense passivation film on the surface of the aluminum wire core, which is used to prevent the generation of the oxide layer during the welding process and improve the welding quality. Then, take out the aluminum wire and rinse it with clean water and dry it to ensure the uniformity and integrity of the passivation film, make the properties of the passivation film on the surface of the aluminum wire core uniform, avoid being affected by the surface oxidation degree during the welding process, and improve the welding consistency.

[0070] For plasma treatment, a plasma cleaning device can be used to treat the surface of the exposed aluminum wire core for 1 to 3 minutes to remove contaminants on the surface of the aluminum wire core, increase the surface activity of the aluminum wire core, and improve the subsequent welding bonding strength. Among them, after plasma treatment, the aluminum wire and the terminal need to be welded immediately by an ultrasonic welding machine to avoid a decrease in the surface activity of the aluminum wire.

[0071] For electrochemical polishing treatment, the exposed aluminum wire core can be used as the anode and electrochemically polished in the electrolyte for 1 to 2 minutes. Then, the aluminum wire is taken out, rinsed with clean water, and dried to ensure the surface finish of the aluminum wire core. Electrochemical polishing can remove the microscopic unevenness on the surface of the aluminum wire core, improve the surface finish and welding quality.

[0072] In specific implementation, one or more of the above pretreatment methods can be selected without mutual influence. For example, the pre-welding pretreatment can include surface cleaning, chemical passivation treatment, and preheating treatment in sequence. Or, the pre-welding pretreatment can also include electrochemical polishing treatment and plasma treatment in sequence.

[0073] The anti-sticking welding process for aluminum wire provided by the embodiment of the present application avoids the adhesion between the intermetallic compound layer formed on the surface of the aluminum wire and the welding head during the welding process by setting an intermediate layer between the welding head and the aluminum wire to be welded, and the material of the intermediate layer is a metal that does not react with the welding head to generate intermetallic compounds, thereby improving the welding quality.

[0074] Obviously, the above embodiments are only examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. An aluminum wire anti-sticking welding process, characterized in that: include: Providing aluminum wires and terminals to be welded, wherein the terminals are placed in a welding area of ​​an ultrasonic welding machine; An intermediate layer is provided between the aluminum wire core of the aluminum wire and the welding head of the ultrasonic welding machine, wherein the material of the intermediate layer is a metal that does not react with the welding head to produce an intermetallic compound; The aluminum wire and the terminal are welded by the ultrasonic welding machine.

2. The aluminum wire anti-sticking welding process according to claim 1, characterized in that: The intermediate layer is provided between the aluminum wire core of the aluminum wire and the welding head of the ultrasonic welding machine, comprising: Placing the welding end of the aluminum wire between the welding head and the terminal, with the aluminum wire core of the welding end exposed; placing the intermediate layer between the welding end of the aluminum wire and the welding head; The intermediate layer is positioned so that the intermediate layer and the aluminum wire remain relatively still.

3. The aluminum wire anti-sticking welding process according to claim 2, characterized in that: The positioning processing of the intermediate layer includes: The intermediate layer is pre-welded to the welding end of the aluminum wire.

4. The aluminum wire anti-sticking welding process according to claim 1, characterized in that: The intermediate layer is provided between the aluminum wire and the welding head of the ultrasonic welding machine, comprising: Wrapping an intermediate layer on the aluminum wire core exposed at the welding end of the aluminum wire; The welding end of the aluminum wire is placed between the welding head and the terminal.

5. The aluminum wire anti-sticking welding process according to claim 1, characterized in that: The intermediate layer is provided between the aluminum wire and the welding head of the ultrasonic welding machine, comprising: Coating metal powder on the aluminum wire core exposed at the welding end of the aluminum wire, wherein the metal powder constitutes the intermediate layer; The welding end of the aluminum wire is placed between the welding head and the terminal, and the metal powder is located between the exposed aluminum wire core and the welding head.

6. The aluminum wire anti-sticking welding process according to any one of claims 2 to 4, characterized in that: Before the intermediate layer is arranged between the aluminum wire and the welding head of the ultrasonic welding machine, the method further comprises: Performing micro-roughening treatment on the surface of the intermediate layer; The surface of the intermediate layer is cleaned.

7. The aluminum wire anti-sticking welding process according to claim 1, characterized in that: The intermediate layer is contained in the aluminum wire, and the intermediate layer is located between the aluminum wire core and the insulation layer of the aluminum wire; The intermediate layer is provided between the aluminum wire and the welding head of the ultrasonic welding machine, comprising: removing the insulation layer of the welding end of the aluminum wire; The welding end of the aluminum wire is placed between the welding head and the terminal so that the exposed intermediate layer is located between the welding head and the aluminum wire core.

8. The aluminum wire anti-sticking welding process according to claim 7, characterized in that: The intermediate layer covers at least half of the continuous outer peripheral side wall of the aluminum wire core.

9. The aluminum wire anti-sticking welding process according to claim 1, characterized in that: Before the aluminum wire and the terminal are welded by the ultrasonic welding machine, the method further includes: Adjust the welding parameters of the ultrasonic welding machine, including On the basis of basic welding parameters, increase welding energy by 10~30%, welding power by 5~25%, welding head down pressure by 5~10%, and amplitude by 15~40%; Set the vibration frequency within the range of 10~30kHZ; The basic welding parameters are welding parameters set for welding the aluminum wire and the terminal when the intermediate layer does not exist.

10. The aluminum wire anti-sticking welding process according to any one of claims 2 to 5, characterized in that: Also includes: Performing pre-welding pretreatment on the aluminum wire core exposed at the welding end of the aluminum wire; The pre-welding pretreatment includes, but is not limited to: surface cleaning, preheating treatment, chemical passivation treatment, plasma treatment, electrochemical polishing treatment, end flattening treatment, and flattening treatment.

11. The aluminum wire anti-sticking welding process according to any one of claims 2 or 7, characterized in that: Also includes: The end of the intermediate layer exceeds the exposed end of the aluminum wire core, or the shrinkage amount of the end of the intermediate layer relative to the exposed end of the aluminum wire core is less than or equal to 0.5 mm.

Images