Processing method of flexible connector and flexible connector

Abstract

The invention discloses a processing method of a flexible connector and the flexible connector. The processing method of the flexible connector comprises the steps that pure glue is attached to the surface of one side of a flexible metal piece; etching the surface of the other side of the flexible metal piece to form an elastic sheet unit; the surface of the other side is coated; arranging a protection assembly; and punching the elastic sheet unit. The pure glue is attached to the surface of one side of the flexible metal part, so that the surface of one side can be prevented from being abraded when the surface of the other side of the flexible metal part is processed, and the stability of the surface of one side is improved; by etching the surface of the other side of the flexible metal piece to form a plurality of elastic sheet units, coating the surface of the other side of the flexible metal piece, arranging the protection assembly and stamping the elastic sheet units, the diversified design requirements of switching interconnection of circuit elements can be effectively met, the safety and reliability of the flexible connector are improved, and the flexible connector is suitable for popularization and application. Miniaturization design of the flexible connector is facilitated, and installation space is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of printed circuit boards, and more particularly to a processing method and a flexible connector for a flexible connector. Background Art

[0002] In the prior art, the PCB board, that is, the printed circuit board, is affected by the limitations of processing and subsequent maintenance operations, and can no longer meet the diverse requirements of the circuit element transfer and interconnection design at the present stage, which is not conducive to the miniaturization design of electronic devices. 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, an object of the present invention is to provide a processing method for a flexible connector, which increases the utilization of space and improves production efficiency.

[0004] A second object of the present invention is to provide a flexible connector processed by the above processing method, including a flexible metal member, a conductive connecting member, a surface coating, an adhesive member, a reinforcing member, and a protective film.

[0005] According to an embodiment of the first aspect of the present invention, a processing method for a flexible connector includes: Applying pure glue to one side surface of the flexible metal member; Etching the other side surface of the flexible metal member to form a shrapnel unit; Performing surface coating on the other side surface; Setting a protection component; Stamping the shrapnel unit.

[0006] According to the processing method of the flexible connector of the embodiment of the present invention, by applying pure glue to one side surface of the flexible metal member, the one side surface can be prevented from being worn or damaged when processing the other side surface of the flexible metal member, and the stability of the one side surface is improved; by etching the other side surface of the flexible metal member to form a plurality of shrapnel units, the production efficiency can be improved and the production process cost can be reduced; by performing surface coating on the other side surface of the flexible metal member, setting a protection component, and stamping the shrapnel unit, the bidirectional interconnection strength of the flexible connector can be improved, effectively meeting the diverse design requirements of circuit element transfer and interconnection, improving the safety and reliability of the flexible connector, being conducive to the miniaturization design of the flexible connector, and facilitating the saving of installation space.

[0007] In some embodiments, after etching the other side surface of the flexible metal member to form a shrapnel unit, the method includes: connecting a plurality of the shrapnel units with a surface-coated conductive connecting member.

[0008] In some embodiments, the performing surface coating on the other side surface includes: filling the other side surface by electroplating; electroplating gold on the other side surface.

[0009] In some embodiments, the surface coating of the other side surface further includes: nickel plating the other side surface; wherein, the nickel plating of the other side surface is performed after electroplating and filling the other side surface and before electroplating gold on the other side surface.

[0010] In some embodiments, the method includes: milling away the conductive connector.

[0011] In some embodiments, the setting of the protection component includes: disposing an adhesive on the other side surface; bonding the protection component to the other side surface through the adhesive.

[0012] In some embodiments, the protection component includes a protective film and a reinforcing member, and the protective film and the reinforcing member are press-fitted; after disposing the adhesive on the other side surface, the method includes: press-fitting the reinforcing member press-fitted with the protective film to the adhesive.

[0013] In some embodiments, the method includes: removing the pure glue attached to one side surface of the flexible metal piece; performing surface coating on the one side surface.

[0014] In some embodiments, the surface coating of the one side surface includes: electroplating and filling the one side surface; nickel plating the one side surface; electroplating gold on the one side surface.

[0015] In some embodiments, after performing surface coating on the one side surface, the method includes: disposing an adhesive on the one side surface; bonding the press-fitted protection component to the one side surface through the adhesive.

[0016] In some embodiments, after setting the protection component, the method includes: press-fitting the flexible connector; stamping the shrapnel unit; performing heat treatment on the flexible connector.

[0017] According to an embodiment of the second aspect of the present invention, a flexible connector includes: a flexible metal piece, a conductive connector, a surface coating layer, an adhesive, a reinforcing member, and a protective film. At least one shrapnel unit is formed on the flexible metal piece. One end of the shrapnel unit is connected to the flexible metal piece, and the other end of the shrapnel unit extends obliquely away from the flexible metal piece; the conductive connector connects two adjacent shrapnel units; the surface coating layer is disposed on a side of the conductive connector away from the flexible metal piece, and the surface coating layer is formed by a surface coating process included in the processing method; the adhesive is disposed on a side of the surface coating layer away from the conductive connector; the reinforcing member is disposed on a side of the adhesive away from the surface coating layer; the protective film is disposed on a side of the reinforcing member away from the adhesive.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Brief Description of the Drawings

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of embodiments in conjunction with the following drawings, in which: Figure 1 is a flowchart of a processing method for a flexible connector according to an embodiment of the present invention. Detailed Description of the Embodiments

[0020] Embodiments of the present invention will be described in detail below. The embodiments described with reference to the drawings are exemplary. Below, reference is made to Figure 1 describe a processing method for a flexible connector according to an embodiment of the present invention.

[0021] The processing method for the flexible connector includes: A pure glue is attached to one side surface of the flexible metal part; The other side surface of the flexible metal part is etched to form a shrapnel unit; The other side surface is surface-coated; A protection component is provided; The shrapnel unit is stamped.

[0022] In this embodiment, the one side surface and the other side surface are two side surfaces in the thickness direction of the flexible metal part. When processing the flexible metal part, in order to avoid damage to the other side surface caused by processing one side surface in the thickness direction, before etching and forming corresponding patterns on the other side surface in the thickness direction of the flexible metal part, it is necessary to attach a layer of pure glue to the side surface opposite to the other side surface in the thickness direction of the flexible metal part. Pure glue, also known as sodium starch octenylsuccinate, is an emulsifying thickener with relatively high safety, and has characteristics such as increasing viscosity and improving stability. The other side surface of the flexible metal part is etched to form a plurality of shrapnel units. Etching means performing photolithographic exposure treatment on the other side surface of the flexible metal part, and then realizing the corrosion treatment to remove the part to be removed through other means. After etching and forming shrapnel units on the other side surface, the area where at least a plurality of shrapnel units are located on the other side surface of the flexible metal part is surface-coated, and a protection component is provided to protect the other side surface, and the shrapnel units are stamped in an up-and-down punching manner, so that the shrapnel units are bent away from each other along the thickness direction of the flexible metal part, that is, bent towards the one side surface and the other side surface respectively.

[0023] The processing method of the flexible connector according to the embodiment of the present invention can avoid abrasion or damage to one side surface of the flexible metal part when processing the other side surface of the flexible metal part by attaching pure glue to one side surface of the flexible metal part, thereby improving the stability of the one side surface; by etching the other side surface of the flexible metal part to form a plurality of elastic sheet units, the production efficiency can be improved and the production process cost can be reduced; by performing surface coating on the other side surface of the flexible metal part, setting a protection component, and stamping the elastic sheet units, the bidirectional interconnection strength of the flexible connector can be improved, effectively meeting the diverse design requirements of circuit element transfer interconnection, improving the safety and reliability of the flexible connector, facilitating the miniaturization design of the flexible connector, and saving the installation space.

[0024] According to some embodiments of the present invention, after etching the other side surface of the flexible metal part to form the elastic sheet units, the method includes: surface coating a conductive connecting piece to connect a plurality of elastic sheet units.

[0025] That is, after etching the other side surface of the flexible metal part to form a plurality of elastic sheet units, a conductive connecting piece is surface coated between the respective elastic sheet units, so that the plurality of elastic sheet units are electrically connected to each other, enabling conduction between the coatings surface coated on the elastic sheet units.

[0026] Thus, by surface coating a conductive connecting piece to connect a plurality of elastic sheet units, the structural strength of the plurality of elastic sheet units can be effectively improved, the stability of the plurality of elastic sheet units can be enhanced, and at the same time, the electrical performance of the elastic sheet units can be improved, effectively improving the working efficiency of the flexible connector.

[0027] According to some embodiments of the present invention, after surface coating the conductive connecting piece on the flexible metal part, the surface coating on the other side surface includes: electroplating and filling the other side surface; electroplating gold on the other side surface.

[0028] That is, after surface coating the conductive connecting piece on the other side surface of the flexible metal part, electroplating and filling the other side surface and electroplating gold are performed. For example, a conductive material, namely copper, is deposited on the other side surface of the flexible metal part to form a copper plating layer to fill surface defects or holes, the other side surface is flattened by electroplating, and then a gold plating layer is formed on the other side surface by electroplating gold.

[0029] Thus, by electroplating and filling the other side surface of the flexible metal part and electroplating gold, it can be ensured that the other side surface is flat, reducing the risk of poor installation or poor contact between circuit elements caused by an uneven surface, thereby improving the reliability and stability of the flexible connector, improving the conductive performance of the other side surface, ensuring good connection between circuit elements, and at the same time, extending the service life of the flexible connector.

[0030] According to some embodiments of the present invention, the surface coating of the other side surface further includes: nickel plating on the other side surface; wherein, the nickel plating on the other side surface is performed after the electroplating and leveling of the other side surface and before the electroplating of gold on the other side surface.

[0031] In this embodiment, after a copper plating layer is formed on the other side surface of the flexible metal part, an electroplating nickel process is used to form a nickel plating layer on the copper plating layer, and then an electroplating gold process is used to form a gold plating layer on the nickel plating layer, that is, the nickel plating layer is located between the copper plating layer and the gold plating layer.

[0032] Therefore, the nickel plating on the other side surface is performed after the electroplating and leveling of the other side surface and before the electroplating of gold on the other side surface. The nickel plating layer can serve as a barrier layer between the copper plating layer and the gold plating layer to prevent the mutual diffusion between gold and copper. At the same time, it can enhance the corrosion resistance, adhesion and conductivity of the copper plating layer, thereby providing a more stable and high-quality basis for the subsequent electroplating gold processing technology.

[0033] According to some embodiments of the present invention, the method includes: milling away the conductive connector.

[0034] That is, after the etching of the shrapnel unit, surface coating, setting of the protection component and pressing of the flexible connector on the other side surface, the pure glue on the surface coating of the side surface of the flexible metal part opposite to the other side surface is removed, and on one side surface of the flexible metal part, the conductive connector connecting multiple shrapnel units on the other side surface of the flexible metal part is completely milled away by means of laser controlled depth milling plus laser ablation.

[0035] Therefore, milling away the conductive connector on the other side surface of the flexible metal part can effectively improve the connection strength between the copper plating layer and multiple shrapnel units, improve the conductivity of the flexible metal part, and at the same time, improve the processing accuracy and quality of the flexible connector.

[0036] According to some embodiments of the present invention, setting the protection component includes: setting an adhesive on the other side surface; bonding the protection component to the other side surface through the adhesive.

[0037] That is, the protection component is bonded to the other side surface of the flexible metal part through the adhesive. At this time, the other side surface has undergone the surface coating process, and the surface coating includes processes such as electroplating and leveling, nickel plating and electroplating gold. Among them, the adhesive can be non-flowing glue PP, and non-flowing glue PP is ethyl cyanoacrylate, which has excellent characteristics such as room temperature curing, high bonding strength, non-toxic cured product, heat resistance, acid and alkali resistance, and corrosion resistance. Therefore, bonding the protection component to the gold plating layer on the other side surface of the flexible metal part through the adhesive can effectively protect the gold plating layer on the other side surface of the flexible metal part, avoid damage to the gold plating layer, and at the same time, improve the sealing performance of the flexible metal part.

[0038] According to some embodiments of the present invention, the protection component includes a protective film and a reinforcing member, and the protective film and the reinforcing member are press-fitted; after a bonding member is provided on the other surface, the method includes: press-fitting the reinforcing member after being press-fitted with the protective film with the bonding member.

[0039] In this embodiment, after one surface of the bonding member is bonded to the gold plating layer, the protective film and the reinforcing member are press-fitted by stamping, and the reinforcing member is connected to the other surface of the bonding member by press-fitting. The side of the reinforcing member away from the protective film is press-fitted with the bonding member to achieve tight connection and fixation. A positioning hole is formed in the flexible metal member, and the protection component and the bonding member are positioned through the same positioning hole, and the reinforcing member is located between the protective film and the bonding member.

[0040] Thus, press-fitting the reinforcing member after being press-fitted with the protective film with the bonding member can effectively improve the connection strength between the protection component and the bonding member, thereby improving the connection strength between the protection component and the other surface of the flexible metal member, avoiding damage to the other surface of the flexible metal member, improving the quality stability of the flexible connector, extending the service life of the flexible connector, and at the same time, after the multi-layer structure provided on the other surface is press-fitted, it can form a tight connection with the flexible metal member, facilitating the tearing off of the pure glue provided on the one surface when the one surface needs to be processed.

[0041] According to some embodiments of the present invention, the method includes: removing the pure glue pasted on one surface of the flexible metal member; performing surface coating on the one surface.

[0042] In this embodiment, after the processing of the other surface of the flexible metal member is completed, the flexible metal member is subjected to secondary surface coating, that is, removing the pure glue pasted on one surface of the flexible metal member and performing surface coating on one surface. Thus, removing the pure glue pasted on one surface of the flexible metal member facilitates surface coating on one surface, improves the surface coating accuracy, makes the two surfaces of the flexible metal member symmetrical to each other, facilitates the subsequent processing of one surface of the flexible metal member, and improves the processing efficiency.

[0043] According to some embodiments of the present invention, the surface coating on the one surface includes: electroplating and filling the one surface; nickel plating the one surface; gold plating the one surface.

[0044] In this embodiment, the process of surface coating and press-fitting on the one surface is the same as the electroplating processing method of the surface coating of the other surface of the flexible metal member. First, a copper plating layer is formed on the one surface of the flexible metal member by electroplating copper to fill the one surface, then a nickel plating layer is electroplated on the copper plating layer, and then a gold plating layer is electroplated on the nickel plating layer. The nickel plating layer is located between the copper plating layer and the gold plating layer.

[0045] Thus, the corrosion resistance, adhesion, and electrical conductivity of the copper plating layer can be enhanced, thereby providing a more stable and high-quality foundation for the subsequent electroplating gold processing technology. At the same time, by appropriately increasing the thickness of the nickel plating layer, the thickness of the gold plating layer can be reduced, thereby reducing the gold plating cost and saving the overall processing production cost.

[0046] According to some embodiments of the present invention, after surface coating on the one side surface, the method includes: providing an adhesive on the one side surface; bonding the pressed protection component to the one side surface through the adhesive.

[0047] Similarly to the bonding process of the protection component on the other side surface of the flexible metal part, after one side surface of the adhesive is bonded to the gold plating layer, the protective film and the reinforcement are pressed together by stamping, and the reinforcement is connected to the other side surface of the adhesive through pressing. The protection component and the adhesive are positioned through the same positioning holes on the flexible metal part, and the reinforcement is located between the protective film and the adhesive.

[0048] Thus, providing an adhesive on the one side surface of the flexible metal part facilitates bonding the pressed protection component to the one side surface through the adhesive, effectively protecting the gold plating layer on the one side surface of the flexible metal part and preventing the gold plating layer from being damaged. At the same time, it effectively improves the connection strength between the protection component and the adhesive on the one side surface, thereby improving the connection strength between the protection component and the one side surface of the flexible metal part, enhancing the quality stability of the flexible connector, and extending the service life of the flexible connector.

[0049] According to some embodiments of the present invention, after providing the protection component, the method includes: pressing the flexible connector; stamping the elastic sheet unit; heat-treating the flexible connector.

[0050] That is, after the protection components are respectively provided on both side surfaces of the flexible metal part, the flexible metal part is secondarily pressed to enable better combination of the coatings and protection components provided on both sides in the thickness direction of the flexible metal part. After the flexible connector is pressed, multiple elastic sheet units on the surface of the flexible metal part are stamped up and down, and the elastic sheet units are bent towards one side surface and the other side surface respectively, and the flexible connector is heat-treated. Among them, the bending angle and stamping height of the elastic sheet unit can be set according to different requirements.

[0051] Thus, after pressing the flexible connector, stamping the elastic sheet unit, and heat-treating the flexible connector, the processing production efficiency of the flexible connector can be improved, the quality stability can be enhanced, and the flexible connector can meet the diverse design requirements of circuit element transfer and interconnection, improving the adaptability of the flexible connector.

[0052] In this embodiment, the processing method of the flexible connector includes: providing pure glue on the one side surface of the flexible metal part; Etch a plurality of elastic sheet units on the other surface of the flexible metal part; Apply a conductive connecting piece on the other surface; Apply coating on the other surface, and the coating process includes but is not limited to electroplating filling, nickel plating and gold plating; Set a protection component on the basis of the gold plating layer formed by gold plating on the other surface; Press the other surface of the flexible metal part; Tear off the pure glue provided on the one surface; Apply coating on the one surface, and the coating process includes but is not limited to electroplating filling, nickel plating and gold plating; Set a protection component on the basis of the gold plating layer formed by gold plating on the one surface; Press the one surface of the flexible metal part; Stamp the elastic sheet unit.

[0053] In addition, in this embodiment, protection components are pressed on both sides of the flexible metal part and stamped so that one end of the elastic sheet unit is connected to the flexible metal part, and the other ends of at least two adjacent elastic sheet units extend away from each other in the thickness direction of the flexible metal part. The flexible connector formed by cutting enables the flexible connector to form a plurality of sub-connecting pieces, and facilitates the detection of the reliability and electrical performance of the flexible connector, and avoids delamination and short circuit of the flexible connector.

[0054] According to the flexible connector of the second aspect embodiment of the present invention, the flexible connector includes: a flexible metal part, a conductive connecting piece, a coating layer, an adhesive, a reinforcing piece and a protective film. At least one elastic sheet unit is formed on the flexible metal part. One end of the elastic sheet unit is connected to the flexible metal part, and the other end of the elastic sheet unit extends obliquely away from the flexible metal part; the conductive connecting piece connects two adjacent elastic sheet units; the coating layer is provided on the side of the conductive connecting piece away from the flexible metal part, and the coating layer is formed by the coating process included in the processing method; the adhesive is provided on the side of the coating layer away from the conductive connecting piece; the reinforcing piece is provided on the side of the adhesive away from the coating layer; the protective film is provided on the side of the reinforcing piece away from the adhesive.

[0055] In this embodiment, first, pure glue is pasted on one side surface of the flexible metal part, and then a plurality of elastic sheet units are formed on the other side surface of the flexible metal part by etching. After processes such as surface coating, bonding a protection component, and pressing are completed on the other side surface, the pure glue pasted on one side surface of the flexible metal part is removed, and the conductive connecting piece on the other side surface is milled away; then processes such as surface coating, bonding a protection component, and pressing are completed on one side surface. Subsequently, a stamping device is used to perform up-and-down stamping on the flexible connector, that is, to simultaneously stamp the elastic sheet units on both sides in the thickness direction of the flexible connector. The stamping device includes a first stamping device and a second stamping device. The first stamping device and the second stamping device are arranged in a dislocation manner in the thickness direction of the flexible connector, so that a plurality of elastic sheet units respectively opposite to the first stamping device and the second stamping device are bent towards one side surface and the other side surface, that is, one end of the elastic sheet unit formed by stamping with the first stamping device is connected to the flexible metal part, and the other end of the elastic sheet unit formed by stamping with the first stamping device extends obliquely away from the flexible metal part; one end of the elastic sheet unit formed by stamping with the second stamping device is connected to the flexible metal part, and the other end of the elastic sheet unit formed by stamping with the second stamping device extends obliquely away from the flexible metal part. The other end of the elastic sheet unit formed by stamping with the first stamping device and the other end of the elastic sheet unit formed by stamping with the second stamping device respectively extend obliquely away from the flexible metal part in the thickness direction of the flexible metal part, so that the flexible connector meets the diversified design requirements of circuit element transfer interconnection and improves the adaptability of the flexible connector.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 thus should not be construed as a limitation to the present invention.

[0057] In the description of the present invention, the "first feature" and "second feature" may include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more. In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. In the description of the present invention, the first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature.

[0058] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean 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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0059] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for processing a flexible connector, characterized in that: Methods include: One side surface of the flexible metal part is pasted with pure glue; Etching the other side surface of the flexible metal piece to form a spring unit; The other side surface is coated; Set up protection components; The spring sheet unit is punched.

2. The method for processing a flexible connector according to claim 1, characterized in that: After etching the other side surface of the flexible metal piece to form the spring unit, the method includes: The surface-coated conductive connector is connected to a plurality of the spring sheet units.

3. The method for processing a flexible connector according to claim 2, characterized in that: The surface coating of the other side includes: The surface of the other side is electroplated and filled; The other side surface is electroplated with gold.

4. The method for processing a flexible connector according to claim 3, characterized in that: The surface coating of the other side also includes: The surface of the other side is nickel plated; The nickel plating on the other side surface is performed after the other side surface is electroplated and filled, and before the other side surface is electroplated with gold.

5. The method for processing a flexible connector according to claim 2, characterized in that: Methods include: The conductive connection is removed by milling.

6. The method for processing a flexible connector according to claim 1, characterized in that: The setting protection component includes: An adhesive member is provided on the other side surface; The protection component is bonded to the other side surface through the adhesive member.

7. The method for processing a flexible connector according to claim 6, characterized in that: The protection assembly comprises a protection film and a reinforcement member, wherein the protection film and the reinforcement member are pressed together; After the adhesive is provided on the other side surface, the method comprises: The reinforcing member pressed together with the protective film is pressed together with the adhesive member.

8. The method for processing a flexible connector according to claim 1, characterized in that: Methods include: Remove the pure glue attached to the one side surface of the flexible metal piece; The one side surface is subjected to surface coating.

9. The method for processing a flexible connector according to claim 8, characterized in that: The surface coating of one side includes: The surface of one side is electroplated and filled; The surface of one side is nickel plated; The one side surface is electroplated with gold.

10. The method for processing a flexible connector according to claim 8, characterized in that: After the surface of one side is coated, the method comprises: An adhesive member is provided on the one side surface; The pressed protection assembly is bonded to the one side surface via the adhesive.

11. The method for processing a flexible connector according to claim 1, characterized in that: After the protection component is set, the method includes: Pressing the flexible connector; Punching the spring unit; The flexible connector is heat treated.

12. A flexible connector, characterized in that: The processing method of the flexible connector according to any one of claims 1 to 11 is adopted, wherein the flexible connector comprises: A flexible metal piece, wherein at least one elastic sheet unit is formed on the flexible metal piece, one end of the elastic sheet unit is connected to the flexible metal piece, and the other end of the elastic sheet unit extends obliquely in a direction away from the flexible metal piece; A conductive connecting member, wherein the conductive connecting member connects two adjacent spring sheet units; A surface coating layer, the surface coating layer is arranged on a side of the conductive connecting member away from the flexible metal member, and the surface coating layer is formed by a surface coating process included in the processing method; An adhesive member, the adhesive member being arranged on a side of the surface coating layer away from the conductive connecting member; A reinforcing member, the reinforcing member being arranged on a side of the adhesive member away from the surface coating layer; A protective film is arranged on a side of the reinforcing member away from the adhesive member.

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