Method for manufacturing electrode column

Abstract

The invention discloses a manufacturing method of an electrode column, the electrode column comprises a copper plate and an aluminum column fixed on the copper plate, and the manufacturing method comprises the following steps: controlling the aluminum column to contact a first side surface of the copper plate; the control friction body rubs the second side face of the copper plate. The friction body is used for rubbing the copper plate, heat generated by friction is used for melting the aluminum column, so that the aluminum column is connected with the copper plate, materials are fully utilized, waste is avoided, a bonding interface of the aluminum column and the copper plate is well controlled, the bonding interface is improved, the connection performance is improved, the aluminum column is fully melted, the atomic diffusion speed is increased, and the production efficiency is improved. Therefore, the connection performance is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production and manufacturing, and in particular to a method for manufacturing an electrode column. Background Art

[0002] In the related technology, the conductive electrode column of the power battery cell is usually an aluminum-copper electrode column. There are two main methods for producing aluminum-copper electrode columns. One is to directly use aluminum-copper composite plates to process them into aluminum-copper electrode columns; the other is to use rotary friction welding to produce aluminum-copper electrode columns. Processing aluminum-copper composite plates into aluminum-copper electrode columns will waste a lot of materials and is costly. Although the rotary friction welding method can save materials, the interface bonding performance is poor and the production efficiency is slow. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a method for manufacturing an electrode column, which avoids waste, improves the bonding performance, and improves production efficiency.

[0004] According to a method for manufacturing an electrode column according to an embodiment of the present invention, the electrode column includes a copper plate and an aluminum column fixed on the copper plate, and the manufacturing method includes the following steps: controlling the aluminum column to contact a first side of the copper plate; and controlling a friction body to rub a second side of the copper plate.

[0005] According to the manufacturing method of the electrode column of the embodiment of the present invention, a friction body is used to rub the copper plate, and the heat generated by the friction is used to melt the aluminum column, so that the aluminum column and the copper plate are connected, the material is fully utilized, and waste is avoided. The interface between the aluminum column and the copper plate is better controlled, thereby improving the bonding interface and improving the connection performance. The aluminum column is fully melted, the atomic diffusion rate is increased, and the production efficiency is improved, thereby further improving the connection performance.

[0006] In some embodiments, controlling the aluminum column to contact the first side of the copper plate includes: controlling the aluminum column to abut against the first side of the copper plate.

[0007] In some embodiments, the manufacturing method further includes the following steps: cleaning the surface of the aluminum column in contact with the first side surface and the first side surface; and controlling the movement of the aluminum column relative to the copper plate.

[0008] In some embodiments, controlling the movement of the aluminum column relative to the copper plate includes: 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.

[0009] In some embodiments, the manufacturing method further includes: installing the copper plate to a limiting portion of a limiting tool.

[0010] In some embodiments, the limiting tool is a sleeve, the sleeve is provided with a mounting groove, and the mounting groove is configured as the limiting portion.

[0011] In some embodiments, the melting point of the friction body is higher than the melting point of the aluminum column.

[0012] In some embodiments, the friction body is made of steel.

[0013] In some embodiments, opposite sides of the copper plate are respectively configured as the first side surface and the second side surface.

[0014] In some embodiments, the manufacturing method further includes: cooling the aluminum column and the copper plate; and machining the aluminum column and the copper plate into finished products.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 The process of the manufacturing method in the embodiment of the present invention is Figure 1 ;

[0018] Figure 2 The process of the manufacturing method in the embodiment of the present invention is Figure 2 ;

[0019] Figure 3 Schematic diagram of the linear movement of the aluminum column relative to the copper plate in an embodiment of the present invention;

[0020] Figure 4 Schematic diagram of the rotation of the aluminum column relative to the copper plate in an embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of an electrode column in a manufacturing process according to an embodiment of the present invention;

[0022] Figure 6 Schematic diagram of the bonding interface between the copper plate and the aluminum column in an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of a stretching curve of a finished product in an embodiment of the present invention;

[0024] Figure 8 This is a specific process of the manufacturing method in an embodiment of the present invention.

[0025] Reference numerals:

[0026] 10. Friction body; 20. Copper plate; 30. Aluminum column. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] In addition, features defined as “first” or “second” may explicitly or implicitly include one or more such features, and are used to distinguish and describe features, without any distinction in order or importance.

[0030] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The manufacturing method of the electrode column according to the embodiment of the present invention is described below with reference to the accompanying drawings.

[0033] Reference Figures 1 to 5 , a method for manufacturing an electrode column according to an embodiment of the present invention comprises the following steps:

[0034] S2 : controlling the aluminum pillar 30 to contact the first side surface of the copper plate 20 .

[0035] S3: controlling the friction body 10 to rub the second side surface of the copper plate 20 .

[0036] The first side surface and the second side surface are different sides of the copper plate 20, which fully utilizes the space around the copper plate 20 and increases the operating space. The friction body 10 is a physical object, and the friction body 10 and the copper plate 20 rub against each other to generate heat, and the copper plate 20 conducts the heat, and 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 nearly melt, and diffuses, so that the aluminum column 30 and the copper plate 20 are connected.

[0037] In the related technology, the conductive electrode column of the power battery cell is usually an aluminum-copper electrode column. There are two main methods for producing aluminum-copper electrode columns. One is to directly use aluminum-copper composite plates to process them into aluminum-copper electrode columns; the other is to use rotary friction welding to produce aluminum-copper electrode columns. Processing aluminum-copper composite plates into aluminum-copper electrode columns will waste a lot of materials and is costly. Although the rotary friction welding method can save materials, the interface bonding performance is poor and the production efficiency is slow.

[0038] In the embodiment of the present invention, the friction body 10 is arranged to rub the copper plate 20. The friction between the friction body 10 and the copper plate 20 generates heat. The heat generated by the friction is used to melt or nearly melt the aluminum column 30, thereby connecting the aluminum column 30 with the copper plate 20, thereby fully utilizing the material and avoiding waste.

[0039] At the same time, compared with the method of rotating the aluminum column in the rotary friction welding technical solution, in the embodiment of the present invention, the interface between the aluminum column 30 and the copper plate 20 is better controlled, thereby improving the bonding interface and improving the connection performance.

[0040] Furthermore, compared with the problem in the rotary friction welding technical solution that the aluminum column cannot continue to be rubbed after being softened by friction, in the embodiment of the present invention, the friction body 10 and the copper plate 20 can continue to rub to generate more heat, which can make the aluminum column 30 fully melt, increase the atomic diffusion rate, and improve production efficiency, thereby further improving the connection performance.

[0041] Specifically, the friction between the friction body 10 and the copper plate 20 may be a rotation relative to the copper plate 20 , or a linear motion.

[0042] For example, the first side surface is arranged opposite to the second side surface, the aluminum column 30 is located on one side of the copper plate 20, and the friction body 10 is located on the opposite side. The friction body 10 rubs the copper plate 20, and heat is conducted to the aluminum column 30 through the copper plate 20, so that the aluminum column 30 is melted or nearly melted, atoms diffuse, and the aluminum column 30 is connected to the copper plate 20.

[0043] According to the manufacturing method of the electrode column of the embodiment of the present invention, the friction body 10 is used to rub the copper plate 20, and the heat generated by the friction is used to melt the aluminum column 30, so that the aluminum column 30 is connected to the copper plate 20, so that the material is fully utilized and waste is avoided. The interface between the aluminum column 30 and the copper plate 20 is better controlled, thereby improving the bonding interface and improving the connection performance. In addition, the aluminum column 30 is fully melted, which increases the atomic diffusion rate and improves the production efficiency, thereby further improving the connection performance.

[0044] Reference Figures 1 to 5 In some embodiments, controlling the aluminum column 30 to contact the first side of the copper plate 20 includes:

[0045] S21 : Control the aluminum column 30 to abut against the first side surface of the copper plate 20 .

[0046] The aluminum column 30 abuts against the first side surface of the copper plate 20 , and there is a pressing force between the aluminum column 30 and the copper plate 20 .

[0047] In the above scheme, the aluminum column 30 is controlled to abut the first side of the copper plate 20 and the aluminum column 30 is pressed so that the contact area between the aluminum column 30 and the copper plate 20 is tightly combined. The pressing force causes sufficient local pressure to be generated on the surfaces of the two, thereby promoting plastic deformation of the connection area. The aluminum column 30 presses the copper plate 20 to ensure that the materials are in a stable contact state during the production process, thereby avoiding dislocation or welding defects of the workpiece due to vibration or uneven pressure distribution during the production process.

[0048] In some embodiments, the manufacturing method further comprises the following steps:

[0049] S4: cleaning the surface of the aluminum column 30 that contacts the first side surface and the first side surface;

[0050] S5: Control the aluminum column 30 to move relative to the copper plate 20.

[0051] The contact portion of the aluminum column 30 and the copper plate 20 is cleaned before contact, especially stains and oxide films with a high melting point and hardness. When the aluminum column 30 and the copper plate 20 are in contact, the relative movement of the aluminum column 30 and the copper plate 20 is controlled.

[0052] It is understandable that an oxide film with a higher melting point and hardness may hinder the direct contact between the aluminum column and the copper plate, and stains may affect the heat conduction efficiency, thereby resulting in poor or failed connection between the aluminum column and the copper plate. The present invention cleans the aluminum column 30 and the copper plate 20 so that the aluminum column 30 is in direct contact with the copper plate 20, and reduces defects such as pores, impurities or unwelded parts at the connection, thereby improving the connection effect. When the aluminum column 30 and the copper plate 20 are in contact, the relative movement of the aluminum column 30 and the copper plate 20 is controlled to further remove the oxide film, thereby further improving the connection effect.

[0053] Specifically, the butt joint surface between the aluminum column 30 and the copper plate 20 is polished by sandpaper, and then the butt joint surface is cleaned by acetone.

[0054] Reference Figure 1 , Figure 2 and Figure 4 In some embodiments, controlling the movement of the aluminum column 30 relative to the copper plate 20 includes:

[0055] S51: Control the aluminum column 30 to rotate relative to the copper plate 20.

[0056] The aluminum column 30 rotates relative to the copper plate 20 so that the oxide film between the aluminum column 30 and the copper plate 20 is removed.

[0057] 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 between the aluminum column 30 and the copper plate 20 is better in the later stage, and defects such as pores and impurities are avoided.

[0058] 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 controlled to stop, thereby improving the bonding performance.

[0059] Reference Figure 1 , Figure 2 and Figure 3 In some other embodiments, controlling the movement of the aluminum column 30 relative to the copper plate 20 includes:

[0060] S52 : Control the aluminum column 30 to move linearly relative to the copper plate 20 .

[0061] The aluminum column 30 moves linearly relative to the copper plate 20 , so that the oxide film between the aluminum column 30 and the copper plate 20 is removed.

[0062] In the above scheme, the linear movement of the aluminum column 30 and the copper plate 20 is controlled to remove the oxide film, so that the connection effect between the aluminum column 30 and the copper plate 20 is better in the later stage, and defects such as pores and impurities are avoided.

[0063] Specifically, before the friction body 10 stops rubbing the second side surface, the linear movement of the aluminum column 30 relative to the copper plate 20 is controlled to stop, thereby improving the bonding performance.

[0064] In some embodiments, the manufacturing method further comprises:

[0065] S6: Install the copper plate 20 to the limiting part of the limiting tooling.

[0066] The limiting fixture is used to limit the copper plate 20, and the copper plate 20 is installed on the limiting part of the limiting fixture so that the copper plate 20 is stationary relative to the limiting fixture.

[0067] In the above scheme, a limit fixture is set to limit the movement of the copper plate 20, so that the copper plate 20 is stationary relative to the limit fixture, 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 work efficiency.

[0068] In some embodiments, the limiting tool is a sleeve, the sleeve is provided with a mounting groove, and the mounting groove is configured as a limiting portion.

[0069] Specifically, the limiting fixture is a sleeve, and the mounting groove on the sleeve is used to install the copper plate 20 to limit the degree of freedom of the copper plate 20 so that the copper plate 20 is fixed on the limiting fixture.

[0070] In the above solution, the copper plate 20 is fixed by a sleeve, which has a simple and practical structure, simplifies the overall structure and reduces the cost.

[0071] In some embodiments, the melting point of the friction body 10 is higher than the melting point of the aluminum column 30 .

[0072] The melting point of the friction body 10 is higher than that of the aluminum column 30 . When the temperature of the copper plate 20 is higher than the melting point of the aluminum column 30 , the friction body 10 maintains its original state, while the aluminum column 30 melts, and the aluminum column 30 is fully connected to the copper plate 20 .

[0073] In the above solution, 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, so that the atoms diffuse faster, thereby improving the connection performance.

[0074] In some embodiments, the friction body 10 is made of steel.

[0075] Specifically, the friction body 10 is made of steel, which has a higher melting point than aluminum. When the aluminum column 30 melts, the friction body 10 made of steel remains in its original state, thereby providing more heat, so that the aluminum column 30 is fully melted and the atoms are fully diffused.

[0076] In the above scheme, the friction body 10 is made of steel. The friction body 10 made of steel always keeps its original shape and rubs against the copper plate 20, providing 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.

[0077] 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. The copper plate 20 is rubbed with steel to make the aluminum column 30 reach a melted or nearly melted state to achieve connection.

[0078] In some embodiments, opposite sides of the copper plate 20 are configured as a first side surface and a second side surface, respectively.

[0079] The first side surface and the second side surface are opposite sides of the copper plate 20 . During the manufacturing process, 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.

[0080] In the above scheme, by setting the opposite surfaces of the copper plate 20 as the first side surface and the second side surface respectively, the first side surface and the second side surface are opposite surfaces, so that the heat generated by friction is conducted to the aluminum column 30 more quickly, and the aluminum column 30 melts more quickly, thereby improving efficiency.

[0081] Reference Figure 1 , Figure 2 In some embodiments, the method for manufacturing the electrode column further comprises:

[0082] S7: Cooling the aluminum column 30 and the copper plate 20.

[0083] S8: The aluminum column 30 and the copper plate 20 are machined to be finished products.

[0084] The aluminum column 30 is connected to the copper plate 20 after being melted, and the molten aluminum or copper is solidified after being cooled, and then machined to finally be processed into a finished product.

[0085] In the above solution, 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 processed into a finished product by machining.

[0086] 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 parts with specific shapes, sizes and surface quality according to design requirements. Machining is characterized by high precision and high efficiency.

[0087] Combine the following Figures 1 to 8 , describing a specific embodiment of the method for manufacturing the electrode column of the present invention.

[0088] In the aluminum-copper electrode column, copper is generally a square thin plate, and aluminum is a cylindrical shape. The specific steps of the manufacturing method are as follows:

[0089] S4: Cleaning the surface of the aluminum column 30 that contacts the first side surface and the first side surface.

[0090] S6: Install the copper plate 20 to the limiting part of the limiting tooling.

[0091] S2: Control the aluminum column 30 to contact the first side surface of the copper plate 20 . The aluminum column 30 abuts against the first side surface of the copper plate 20 .

[0092] S5: Control the aluminum column 30 to move relative to the copper plate 20. The aluminum column 30 rotates relative to the copper plate 20.

[0093] S3: controlling the friction body 10 to rub the second side surface of the copper plate 20 .

[0094] S7: Cooling the aluminum column 30 and the copper plate 20.

[0095] S8: The aluminum column 30 and the copper plate 20 are machined to be finished products.

[0096] Specific process reference Figure 8 :First, prepare the copper plate 20 and the aluminum column 30, and clean the surfaces to be connected between the copper plate 20 and the aluminum column 30, especially remove the oxide film and stains (for example, first grind the connecting surface with sandpaper, and then clean it with acetone), then press the copper plate 20 and the aluminum column 30 tightly, and then the friction body 10 generates heat by friction on the surface of the copper plate 20. With the help of heat conduction between copper and aluminum, the heat heats the aluminum to a molten or nearly molten state (400-1000°C), and the pressure is maintained continuously. The aluminum extrusion part of the interface (liquid aluminum is extruded around the contact surface of the aluminum column 30 and the copper plate 20) is cooled, and then machined to finally be processed into a finished electrode column. If necessary before the final machining, a stress relief process can be added to remove the internal stress of the product, and stress relief can be achieved by annealing.

[0097] Among them, the surfaces of the copper plate 20 and the aluminum column 30 to be butted may still be oxidized after being cleaned. After the copper plate 20 and the aluminum column 30 are pressed tightly, the oxide film is further removed by controlling the relative movement of the copper plate 20 and the aluminum column 30.

[0098] Finally, the finished electrode column is processed into a tensile specimen (welding surface φ10mm), according to Figure 7 , the maximum tensile force is 3900N and the tensile strength is 49.7MPa.

[0099] The present invention generates heat and pressure through back friction, thereby avoiding the problem of material waste in the traditional aluminum-copper composite plate processing electrode column process, and also avoiding the problems of poor interface bonding performance and low efficiency of rotary friction welding.

[0100] Other operations of the manufacturing method according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0101] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to 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.

[0102] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for manufacturing an electrode column, characterized in that: The electrode column comprises a copper plate and an aluminum column fixed on the copper plate, and the manufacturing method comprises the following steps: Controlling the aluminum column to contact the first side of the copper plate; The friction body is controlled to rub the second side surface of the copper plate.

2. The method for manufacturing an electrode column according to claim 1, characterized in that: The controlling the aluminum column to contact the first side of the copper plate comprises: The aluminum column is controlled to abut against the first side surface of the copper plate.

3. The method for manufacturing an electrode column according to claim 2, characterized in that: The following steps are also included: Cleaning the surface of the aluminum column in contact with the first side surface and the first side surface; The aluminum column is controlled to move relative to the copper plate.

4. The method for manufacturing an electrode column according to claim 3, characterized in that: The controlling the movement of the aluminum column relative to the copper plate comprises: The aluminum column is controlled to rotate relative to the copper plate; or, the aluminum column is controlled to move linearly relative to the copper plate.

5. The method for manufacturing an electrode column according to claim 1, characterized in that: Also includes: Install the copper plate to the limiting part of the limiting tool.

6. The method for manufacturing an electrode column according to claim 5, characterized in that: The limiting tool is a sleeve, and the sleeve is provided with a mounting groove, and the mounting groove is configured as the limiting portion.

7. The method for manufacturing an electrode column according to claim 1, characterized in that: The melting point of the friction body is higher than the melting point of the aluminum column.

8. The method for manufacturing an electrode column according to claim 7, characterized in that: The friction body is made of steel.

9. The method for manufacturing an electrode column according to claim 1, characterized in that: The opposite sides of the copper plate are respectively configured as the first side surface and the second side surface.

10. The method for manufacturing an electrode column according to claim 1, characterized in that: Also includes: Cooling the aluminum column and the copper plate; The aluminum column and the copper plate are machined into finished products.

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