Manufacturing method for electrode post

Abstract

Disclosed in the present application is a manufacturing method for an electrode post, wherein the electrode post comprises a copper plate and an aluminum post fixed on the copper plate. The manufacturing method comprises the following steps: controlling the aluminum post to come into contact with a first side surface of the copper plate; and controlling a friction body to rub against a second side surface of the copper plate.

Description

Method for manufacturing electrode post

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202510094750.8, filed on January 21, 2025, and entitled "Method for manufacturing electrode post", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery production and manufacturing, in particular to a method for manufacturing an electrode post. BACKGROUND

[0004] In the related art, the conductive electrode post of the power battery cell is usually an aluminum-copper electrode post. There are mainly two methods for producing the aluminum-copper electrode post, one is to directly use an aluminum-copper composite plate to process the aluminum-copper electrode post, and the other is to produce the aluminum-copper electrode post by using a rotary friction welding method. The aluminum-copper composite plate processing the aluminum-copper electrode post wastes a lot of materials and has a high cost. Although the rotary friction welding method can save materials, the interface bonding performance is poor and the production efficiency is slow. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a method for manufacturing an electrode post, which avoids waste and improves bonding performance and production efficiency.

[0006] According to the method for manufacturing an electrode post of an embodiment of the present application, the electrode post includes a copper plate and an aluminum post fixed on the copper plate, and the manufacturing method includes the following steps: controlling the aluminum post to contact a first side surface of the copper plate; and controlling a friction body to rub a second side surface of the copper plate.

[0007] According to the method for manufacturing an electrode post of an embodiment of the present application, the copper plate is rubbed by the friction body, the aluminum post is melted by the heat generated by the friction, the aluminum post is connected with the copper plate, the materials are fully utilized, the waste is avoided, the interface of the aluminum post and the copper plate is well controlled, the bonding interface is improved, the connection performance is improved, the aluminum post is fully melted, the atomic diffusion speed is improved, the production efficiency is improved, and the connection performance is further improved.

[0008] In some embodiments, the step of controlling the aluminum post to contact the first side surface of the copper plate includes: controlling the aluminum post to abut against the first side surface of the copper plate.

[0009] In some embodiments, the manufacturing method further includes the following steps: cleaning a surface of the aluminum post in contact with the first side surface and the first side surface; and controlling the aluminum post to move relative to the copper plate.

[0010] In some embodiments, the controlling the movement of the aluminum column relative to the copper plate comprises: controlling the rotation of the aluminum column relative to the copper plate; or, controlling the linear movement of the aluminum column relative to the copper plate.

[0011] In some embodiments, the manufacturing method further comprises: mounting the copper plate to a limiting part of a limiting tool.

[0012] In some embodiments, the limiting tool is a sleeve, and the sleeve is provided with a mounting groove configured as the limiting part.

[0013] In some embodiments, the friction body has a melting point higher than that of the aluminum column.

[0014] In some embodiments, the material of the friction body comprises steel.

[0015] In some embodiments, the opposite surfaces of the copper plate are respectively configured as the first side surface and the second side surface.

[0016] In some embodiments, the manufacturing method further comprises: cooling the aluminum column and the copper plate; and machining the aluminum column and the copper plate into finished products.

[0017] Additional aspects and advantages of the present application will be in part apparent and in part expressly stated in the description that follows, and by reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the description that follows, and by reference to the drawings.

[0019] FIG. 1 is a flowchart of a manufacturing method according to an embodiment of the present application;

[0020] FIG. 2 is a flowchart of a manufacturing method according to another embodiment of the present application;

[0021] FIG. 3 is a schematic diagram of the linear movement of an aluminum column relative to a copper plate according to an embodiment of the present application;

[0022] FIG. 4 is a schematic diagram of the rotation of an aluminum column relative to a copper plate according to an embodiment of the present application;

[0023] FIG. 5 is a schematic diagram of an electrode column during the manufacturing process according to an embodiment of the present application;

[0024] FIG. 6 is a schematic diagram of the interface between a copper plate and an aluminum column according to an embodiment of the present application;

[0025] FIG. 7 is a schematic diagram of the tensile curve of a finished product according to an embodiment of the present application;

[0026] FIG. 8 is a detailed process of a manufacturing method according to an embodiment of the present application.

[0027] 10, friction body; 20, copper plate; 30, aluminum column. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0029] The manufacturing method of the electrode column of the embodiments of the present application is described below in conjunction with the drawings.

[0030] Referring to FIGS. 1-5, the manufacturing method of an electrode column according to an embodiment of the present application includes the following steps:

[0031] S2: Control the aluminum column 30 to contact the first side of the copper plate 20.

[0032] S3: Control the friction body 10 to rub the second side of the copper plate 20.

[0033] Wherein, the first side and the second side are different sides of the copper plate 20, making full use of the peripheral space of the copper plate 20 to increase the operation space. The friction body 10 is a physical object, and the friction body 10 rubs the copper plate 20 to generate heat, and the copper plate 20 conducts heat. The aluminum column 30 contacts the copper plate 20, and the heat conducted by the copper plate 20 causes the aluminum column 30 to melt or approach melting, diffusion occurs, so that the aluminum column 30 and the copper plate 20 are connected.

[0034] In the related art, the conductive electrode column of the power battery cell is usually an aluminum-copper electrode column. There are mainly two kinds of currently commonly used aluminum-copper electrode column production methods. One is to directly use aluminum-copper composite plates to process aluminum-copper electrode columns; the other is to use a rotary friction welding method to produce aluminum-copper electrode columns. The aluminum-copper composite plate processing aluminum-copper electrode column will waste more materials and have high cost. Although the rotary friction welding method can save materials, the interface bonding performance is poor and the production efficiency is slow.

[0035] In the embodiments of the present application, the friction body 10 rubs the copper plate 20, the friction body 10 rubs the copper plate 20 to generate heat, and the heat generated by friction causes the aluminum column 30 to melt or approach melting, thereby connecting the aluminum column 30 and the copper plate 20, making full use of the material and avoiding waste.

[0036] At the same time, compared with the rotating aluminum column in the rotary friction welding technical solution, the interface between the aluminum column 30 and the copper plate 20 in the embodiments of the present application is better controlled, thereby improving the bonding interface and improving the connection performance.

[0037] Furthermore, compared to the problem in the rotary friction welding technology where the aluminum column softens and cannot continue friction, in this embodiment, the friction body 10 and the copper plate 20 can continue to rub and generate more heat, which enables the aluminum column 30 to fully melt, increases the atomic diffusion rate, improves production efficiency, and further improves the connection performance.

[0038] Specifically, the friction between the friction body 10 and the copper plate 20 can be rotational relative to the copper plate 20, or linear motion.

[0039] For example, the first side and the second side are arranged opposite each other, the aluminum pillar 30 is located on one side of the copper plate 20, the friction body 10 is located on the opposite side, the friction body 10 rubs the copper plate 20, and the heat is conducted through the copper plate 20 to the aluminum pillar 30, causing the aluminum pillar 30 to melt or nearly melt, and the atoms diffuse, and the aluminum pillar 30 connects to the copper plate 20.

[0040] According to the electrode post manufacturing method of the present application embodiment, the copper plate 20 is rubbed by the friction body 10, and the heat generated by the friction melts the aluminum post 30, so that the aluminum post 30 is connected to the copper plate 20. This makes full use of materials and avoids waste. The interface between the aluminum post 30 and the copper plate 20 is well controlled, thereby improving the interface and the connection performance. In addition, the aluminum post 30 is fully melted, which increases the atomic diffusion rate and improves the production efficiency, thereby further improving the connection performance.

[0041] Referring to Figures 1 to 5, in some embodiments, controlling the aluminum pillar 30 to contact the first side of the copper plate 20 includes:

[0042] S21: Control the aluminum column 30 to abut against the first side of the copper plate 20.

[0043] The aluminum column 30 abuts against the first side of the copper plate 20, and there is a clamping force between the aluminum column 30 and the copper plate 20.

[0044] In the above scheme, by controlling the aluminum column 30 to abut against the first side of the copper plate 20 and pressing the aluminum column 30, the contact area between the aluminum column 30 and the copper plate 20 is tightly bonded. The pressing force generates sufficient local pressure on the surfaces of both, thereby promoting plastic deformation of the connection area. Furthermore, by pressing the copper plate 20, the aluminum column 30 ensures that the materials are in a stable contact state during the production process, avoiding misalignment or welding defects in the workpiece due to vibration or uneven pressure distribution during the production process.

[0045] In some embodiments, the manufacturing method further includes the following steps:

[0046] S4: Clean the surface of the aluminum column 30 that contacts the first side and the first side surface;

[0047] S5: Controls the movement of the aluminum column 30 relative to the copper plate 20.

[0048] The part of the aluminum column 30 in contact with the copper plate 20 is cleaned before contact, especially stains and oxide films with high melting point and hardness. When the aluminum column 30 is in contact with the copper plate 20, the relative movement of the aluminum column 30 and the copper plate 20 is controlled.

[0049] It can be understood that the oxide film with high melting point and hardness may hinder the direct contact of the aluminum column and the copper plate, and the stains may affect the heat conduction efficiency, thereby causing poor or failed connection effect of the aluminum column and the copper plate. The aluminum column 30 and the copper plate 20 are cleaned in the present application, so that the aluminum column 30 and the copper plate 20 are directly in contact, and the defects such as pores, impurities or incomplete welding at the connection part are reduced, the connection effect is improved, and the relative movement of the aluminum column 30 and the copper plate 20 is controlled when the aluminum column 30 is in contact with the copper plate 20, thereby further removing the oxide film and further improving the connection effect.

[0050] Specifically, the abutting surfaces of the aluminum column 30 and the copper plate 20 are polished by sandpaper, and then the abutting surfaces are cleaned with acetone.

[0051] Referring to FIGS. 1, 2 and 4, in some embodiments, the control of the movement of the aluminum column 30 relative to the copper plate 20 includes:

[0052] S51: Control the rotation of the aluminum column 30 relative to the copper plate 20.

[0053] The aluminum column 30 is rotated relative to the copper plate 20, so that the oxide film between the aluminum column 30 and the copper plate 20 is removed.

[0054] In the above scheme, by controlling the relative rotation of the aluminum column 30 and the copper plate 20, the oxide film is removed, so that the connection effect of the aluminum column 30 and the copper plate 20 is better in the later stage, and defects such as pores and impurities are avoided.

[0055] Specifically, before the friction body 10 stops rubbing the second side surface, the rotation of the aluminum column 30 relative to the copper plate 20 is stopped, thereby improving the bonding performance.

[0056] Referring to FIGS. 1, 2 and 3, in some embodiments, the control of the movement of the aluminum column 30 relative to the aluminum plate 20 includes:

[0057] S52: Control the linear motion of the aluminum column 30 relative to the copper plate 20.

[0058] The aluminum column 30 is linearly moved relative to the copper plate 20, so that the oxide film between the aluminum column 30 is removed.

[0059] In the above scheme, by controlling the linear motion of the aluminum column 30 and the copper plate 20, the oxide film is removed, and the connection effect of the aluminum column 30 and the copper plate 20 is better in the late stage, and defects such as pores and impurities are avoided.

[0060] Specifically, before the friction body 10 stops rubbing the second side surface, the linear motion of the aluminum column 30 relative to the copper plate 20 is stopped, thereby improving the bonding performance.

[0061] In some embodiments, the manufacturing method further comprises:

[0062] S6: mounting the copper plate 20 to the limiting part of the limiting tool.

[0063] The limiting tool is used to limit the copper plate 20, and the copper plate 20 is mounted on the limiting part of the limiting tool, so that the copper plate 20 is stationary relative to the limiting tool.

[0064] In the above scheme, by setting the limiting tool to limit the movement of the copper plate 20, the copper plate 20 is stationary relative to the limiting tool, preventing the copper plate 20 from moving with the friction body 10, thereby maximizing the friction between the friction body 10 and the copper plate 20, and improving the work efficiency.

[0065] In some embodiments, the limiting tool is a sleeve, and the sleeve is provided with a mounting groove configured as the limiting part.

[0066] Specifically, the limiting tool is a sleeve, and the mounting groove on the sleeve is used to mount the copper plate 20 and limit the degrees of freedom of the copper plate 20, so that the copper plate 20 is fixed on the limiting tool.

[0067] In the above scheme, the copper plate 20 is fixed by the sleeve, which is simple and practical in structure, simplifies the overall structure, and reduces the cost.

[0068] In some embodiments, the melting point of the friction body 10 is higher than the melting point of the aluminum column 30.

[0069] The melting point of the friction body 10 is higher than the melting point of the aluminum column 30, and when the temperature of the copper plate 20 is higher than the melting point of the aluminum column 30, the friction body 10 remains unchanged, while the aluminum column 30 melts, and the aluminum column 30 is fully connected with the copper plate 20.

[0070] In the above scheme, by configuring the melting point of the friction body 10 to be higher than the melting point of the aluminum column 30, the aluminum column 30 is fully melted, and the atoms diffuse faster, thereby improving the connection performance.

[0071] In some embodiments, the material of the friction body 10 includes steel.

[0072] Specifically, the friction body 10 is made of steel, and the melting point of steel is higher than that of aluminum. When the aluminum column 30 melts, the friction body 10 made of steel remains unchanged, thereby providing more heat to make the aluminum column 30 fully melt and the atoms fully diffuse.

[0073] In the above scheme, the friction body 10 is made of steel, and the steel friction body 10 always maintains the original state and rubs against the copper plate 20 to provide more heat for the aluminum column 30, so that the aluminum column 30 is fully melted, thereby making the atoms diffuse faster and improving the reliability of the connection between the aluminum column 30 and the copper plate 20.

[0074] Specifically, the melting point of pure copper is 1083°C, the melting point of pure aluminum is 660°C, and the melting point of steel is 1515°C. By rubbing the copper plate 20 with steel, the aluminum column 30 reaches a molten or near-molten state, achieving connection.

[0075] In some embodiments, the opposite sides of the copper plate 20 are respectively configured as a first side and a second side.

[0076] The first side and the second side are opposite sides of the copper plate 20, and during manufacturing, the aluminum column 30 and the friction body 10 are respectively located on opposite sides of the copper plate 20, and the copper plate 20 directly conducts heat.

[0077] In the above scheme, by setting the opposite sides of the copper plate 20 as the first side and the second side, the heat generated by friction is quickly conducted to the aluminum column 30, and the aluminum column 30 is quickly melted, thereby improving efficiency.

[0078] Referring to FIGS. 1 and 2, in some embodiments, the manufacturing method of the electrode column further comprises:

[0079] S7: cooling the aluminum column 30 and the copper plate 20.

[0080] S8: machining the aluminum column 30 and the copper plate 20 into finished products.

[0081] The aluminum column 30 is connected to the copper plate 20 after melting, and the molten aluminum or copper is solidified after cooling, then machined, and finally processed into finished products.

[0082] In the above scheme, by cooling the aluminum column 30 and the copper plate 20, the product is quickly formed, the overall performance is improved, and the semi-finished product is machined into a finished product using machining.

[0083] Specifically, machining is a manufacturing method that uses mechanical equipment to remove, shape, and process raw materials. Through machining, raw materials can be processed into specific shaped, sized, and surface quality parts according to design requirements. Machining has the characteristics of high precision and high efficiency.

[0084] The following describes one specific embodiment of the manufacturing method of the electrode column of the present application in conjunction with FIGS. 1 to 8.

[0085] In the aluminum-copper electrode column, the copper is generally a square thin plate, and the aluminum is a cylindrical shape. The manufacturing method comprises the following specific steps:

[0086] S4: clean the surface of the aluminum column 30 in contact with the first side and the first side.

[0087] S6: install the copper plate 20 to the limiting part of the limiting tool.

[0088] S2: control the aluminum column 30 to contact the first side of the copper plate 20. Wherein, the aluminum column 30 abuts against the first side of the copper plate 20.

[0089] S5: control the aluminum column 30 to move relative to the copper plate 20. Wherein, the aluminum column 30 rotates relative to the copper plate 20.

[0090] S3: control the friction body 10 to rub the second side of the copper plate 20. Before the friction body 10 stops rubbing the second side of the copper plate 20, control the rotation of the aluminum column 30 relative to the copper plate 20 to stop.

[0091] S7: cool the aluminum column 30 and the copper plate 20.

[0092] S8: machine the aluminum column 30 and the copper plate 20 into finished products.

[0093] The specific process is shown in FIG. 8: first, prepare the copper plate 20 and the aluminum column 30, and clean the surfaces of the copper plate 20 and the aluminum column 30 to be connected, especially remove the oxide film and stains (for example, first polish the connecting surface with sandpaper, and then clean it with acetone), then press the copper plate 20 and the aluminum column 30 tightly, then the friction body 10 rubs on the surface of the copper plate 20 to generate heat, and through the heat conduction between copper and aluminum, the aluminum is heated to a molten or near molten state (400-1000℃), the pressure is maintained, the interface aluminum is extruded (there is liquid aluminum extruded around the connecting surface of the aluminum column 30 and the copper plate 20), then cooled, then machined, and finally processed into an electrode column finished product. If necessary, a stress relief process can be added before final machining to remove internal stress of the product, which can be achieved by annealing.

[0094] Wherein, after cleaning the surfaces of the copper plate 20 and the aluminum column 30 to be connected, there may still be oxidation, which can be further removed by controlling the relative movement of the copper plate 20 and the aluminum column 30 after pressing the copper plate 20 and the aluminum column 30 tightly.

[0095] Finally, the electrode column finished product is processed into a tensile specimen (welding surface φ10mm), according to FIG. 7, the maximum tensile force is 3900N, and the tensile strength is 49.7MPa.

[0096] The application avoids the problem of material waste in the traditional aluminum-copper composite plate processing electrode column process, and also avoids the problems of poor interface bonding performance and slow efficiency in rotary friction welding.

[0097] Other operations of the manufacturing method according to the embodiments of the present application are known to those of ordinary skill in the art and are not described in detail here.

[0098] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0099] In the description of the present application, "first feature" and "second feature" can include one or more of the features.

[0100] In the description of the present application, "a plurality of" means two or more.

[0101] In the description of the present application, "above" or "below" the first feature of the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them.

[0102] In the description of the present application, "above", "over" and "on" the first feature of the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0103] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0104] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A method of manufacturing an electrode stud, wherein, The electrode post comprises a copper plate and an aluminum post fixed on the copper plate, and the manufacturing method comprises the following steps: controlling the aluminum post to contact a first side of the copper plate; controlling a friction body to rub a second side of the copper plate.

2. The method of manufacturing an electrode post according to claim 1, wherein, The step of controlling the aluminum post to contact the first side of the copper plate comprises: controlling the aluminum post to abut against the first side of the copper plate.

3. The method of manufacturing an electrode post according to claim 2, wherein, The method further comprises the following steps: cleaning the surface of the aluminum post in contact with the first side and the first side; controlling the aluminum post to move relative to the copper plate.

4. The method of manufacturing an electrode post according to claim 3, wherein, The step of controlling the aluminum post to move relative to the copper plate comprises: controlling the aluminum post to rotate relative to the copper plate; or, controlling the aluminum post to linearly move relative to the copper plate.

5. The method of manufacturing an electrode post according to any one of claims 1-4, wherein, The method further comprises: mounting the copper plate to a limiting part of a limiting tool.

6. The method of manufacturing an electrode post according to claim 5, wherein, The limiting tool is a sleeve, and the sleeve is provided with a mounting groove configured as the limiting part.

7. The method of manufacturing an electrode post according to any one of claims 1-6, wherein, The melting point of the friction body is higher than the melting point of the aluminum post.

8. The method of manufacturing an electrode post according to claim 7, wherein, The material of the friction body comprises steel.

9. The method of manufacturing an electrode post according to any one of claims 1-8, wherein, The opposite surfaces of the copper plate are respectively configured as the first side and the second side.

10. The method of manufacturing an electrode post according to any one of claims 1-9, wherein, The method further comprises: cooling the aluminum post and the copper plate; machining the aluminum post and the copper plate into finished products.

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