Elastic electric contact terminal and electronic device

Abstract

The application provides an elastic electric contact terminal and an electronic device, and relates to the field of communication equipment. The elastic electric contact terminal comprises an elastic core and a conductive layer. The elastic core endows the elastic electric contact terminal with elasticity. The conductive layer comprises a first wall, a second wall connected to two sides of the first wall and forming an included angle with the first wall, and an extension wall connected to the other end of the second wall and forming an included angle with the second wall, and the first wall and the two second walls jointly define a containing cavity with an opening; the elastic core is filled in the containing cavity, each extension wall extends in a direction away from the containing cavity, and each extension wall is provided with a welding area. The welding stability and quality between the elastic electric contact terminal and the substrate can be improved, and the performance of the product after welding can be improved.

Description

Technical Field

[0001] This application relates to the field of communication equipment, and more specifically, to a flexible electrical contact terminal and an electronic device. Background Technology

[0002] In electronic devices, flexible electrical contacts are commonly used for electromagnetic shielding, signal interference elimination, or grounding. Flexible electrical contacts are fixed to a substrate by welding, but existing flexible electrical contacts suffer from poor welding quality and suboptimal product performance after being fixed to the substrate. Utility Model Content

[0003] The purpose of this application is to provide a flexible electrical contact terminal that can improve the welding stability and welding quality between the flexible electrical contact terminal and the substrate, thereby improving the performance of the product after welding.

[0004] The first aspect of this application provides a resilient electrical contact terminal for mounting on a substrate, which includes a resilient core and a conductive layer.

[0005] The elastic core provides elasticity to the elastic electrical contact terminal.

[0006] The conductive layer includes a first wall, second walls connected to both sides of the first wall and forming an angle with it, and an extensional wall connected to the other end of the second wall and forming an angle with it. The first wall and the two second walls together define an accommodating chamber with an opening.

[0007] The elastic core fills the receiving cavity, and each of the outer walls extends in a direction away from the receiving cavity, with a welding area provided on each of the outer walls.

[0008] The flexible electrical contact terminal provided in this application, through the improvement of the conductive layer structure, makes the conductive layer generally cap-shaped, with two outer walls located on both sides of the receiving chamber. Since each outer wall has a welding area, the double-sided welding method on both sides of the receiving chamber not only avoids the problems of heat concentration, insufficient welding strength, and warping of non-welded ends due to heat during welding, but also effectively increases the welding area compared to single-sided welding, improving the welding strength between the flexible electrical contact terminal and the substrate, and further facilitating the dispersion of heat during welding, avoiding thermal damage to the welding area. The combined effect effectively improves the welding stability and quality between the flexible electrical contact terminal and the substrate, enhancing the performance of the product after welding.

[0009] In one possible implementation, the extensional wall has a corner portion connected to the second wall and forming a corner, and a support portion connected to the corner portion and extending in a direction away from the receiving chamber, with the welding area located in the support portion; and / or,

[0010] Each welding zone has a first edge close to the receiving chamber and a second edge away from the receiving chamber, and the shortest straight-line distance between the first edge and the second edge is ≥2mm.

[0011] In the above implementation process, placing the welding area in the support section is beneficial for improving the welding effect and extending the service life of the flexible electrical contact terminal. Controlling the shortest straight-line distance between the first and second edges of each welding area to meet the above parameter requirements allows for at least two rows of solder joints to be arranged along the extension direction of the outer wall in the welding area, which helps improve the welding strength between the flexible electrical contact terminal and the substrate.

[0012] In one possible implementation, the resilient electrical contact terminal further includes a first adhesive layer located between the resilient core and the conductive layer to bond the resilient core and the conductive layer.

[0013] In the above implementation process, the elastic core and the conductive layer are bonded together by the first adhesive layer, which can stably fix the elastic core in the receiving cavity and prevent displacement between the elastic core and the conductive layer.

[0014] In one possible implementation, the first adhesive layer is located between the elastic core and the first wall.

[0015] In the above implementation process, by having the first adhesive layer located between the elastic core and the first wall, not only can the lateral displacement of the elastic core be restricted, but the structure of the elastic electrical contact terminal can also be simplified, and the manufacturing process can be simplified.

[0016] In one possible implementation, the elastic core includes a polymer elastic core, a polymer coating film, and a second adhesive layer. The polymer coating film covers the surface of the polymer elastic core, and the second adhesive layer is located between the polymer elastic core and the polymer coating film to bond the polymer elastic core and the polymer coating film.

[0017] In the above implementation process, the polymer elastic core and the polymer coating film are bonded together by the second adhesive layer to prevent them from shifting. At the same time, the polymer coating film is used to coat the surface of the polymer elastic core, which not only provides mechanical strength and has a reinforcing effect, but also provides a carrier for the conductive layer to be plated, which facilitates the plating. In addition, the polymer coating film should have high temperature resistance.

[0018] Optionally, the polymeric elastic core comprises polyurethane and / or silicone; and / or, the polymeric coating film comprises PI.

[0019] PI not only provides mechanical strength and reinforcement, but also has excellent high-temperature resistance because the actual application of this flexible electrical contact terminal involves steps such as laser welding / reflow welding, which involve high welding temperatures. Ordinary plastics cannot withstand these temperatures.

[0020] In one possible implementation, the polymer elastic core has a first end and a second end opposite to each other, with the first end located on the side close to the first wall.

[0021] The second adhesive layer includes a first part and a second part, the first part being located between the first end and the polymer coating film, and the second part being located between the second end and the polymer coating film.

[0022] In the above implementation process, the above settings can not only limit the lateral displacement between the bottom of the polymer elastic core and the polymer coating film, but also simplify the structure of the elastic electrical contact terminal and simplify the manufacturing process.

[0023] In one possible implementation, the elastic core further includes a polymer support layer disposed between the elastic core and the conductive layer.

[0024] In the above implementation process, the polymer support layer can effectively support the polymer elastic core, provide a certain support force to the elastic core, improve structural strength, reinforce, and prevent wrinkles.

[0025] Optionally, the polymer support layer includes PET.

[0026] In one possible implementation, the welding area has a first surface and a second surface opposite each other, the second surface being used to contact the substrate.

[0027] The first surface of the welding area is provided with a metal auxiliary layer, the laser absorptivity of which is greater than that of the epitaxial wall; and / or,

[0028] A third adhesive layer is provided on the second surface of the welding area.

[0029] In the above process, a laser welding device emits a laser, which sequentially passes through the metal auxiliary layer, the epitaxial wall, and the substrate to achieve double-sided laser welding. The third adhesive layer allows the flexible electrical contact terminals to be bonded to the substrate for positioning before welding, facilitating automated and precise assembly followed by welding.

[0030] In one possible implementation, the surface resistance of the conductive layer is ≤0.03Ω / □; and / or,

[0031] The conductive layer includes gold-plated copper foil or nickel-plated copper foil.

[0032] In the above implementation process, the surface resistance of the conductive layer is within the above range. The conductive layer has ultra-low resistance, good conductivity and anti-oxidation properties, which is beneficial to improving the conductivity and durability of the flexible electrical contact terminal.

[0033] A second aspect of this application provides an electronic device, which includes a flexible electrical contact terminal and a substrate according to the first aspect of this application, with a soldering area soldered to the substrate.

[0034] The electronic device provided in this application, due to improvements in the flexible electrical contact terminals, allows for double-sided welding of the welding area to the substrate. This not only avoids problems such as heat concentration, insufficient weld strength, and heat-induced warping of non-welded ends during welding, but also effectively increases the welding area compared to single-sided welding, improving the weld strength between the flexible electrical contact terminals and the substrate. Furthermore, it helps to disperse heat during the welding process, preventing thermal damage to the welding area. These combined effects effectively improve the welding stability and quality between the flexible electrical contact terminals and the substrate, ultimately enhancing the performance of the product after welding. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A cross-sectional schematic diagram of the flexible electrical contact terminal provided in an embodiment of this application;

[0037] Figure 2 This is a schematic diagram of the structure of the flexible electrical contact terminal provided in an embodiment of this application.

[0038] Icons: 1000 - Flexible electrical contact terminal; 10 - Flexible core; 11 - Polymer elastic core; 12 - Polymer coating film; 131 - First part; 133 - Second part; 14 - Polymer support layer; 20 - Conductive layer; 21 - First wall; 22 - Second wall; 23 - Extensional wall; 24 - Receiving cavity; 231 - Welding area; 232 - Second corner; 233 - Support part; 30 - First adhesive layer; 40 - Third adhesive layer; 50 - Metal auxiliary layer; 60 - Fourth adhesive layer. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this application, it should be noted that the terms "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] Furthermore, terms such as "horizontal" do not imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] The main reasons for the poor welding quality and product performance of existing flexible electrical contact terminals are as follows: Existing flexible electrical contact terminals are usually fixed to the substrate by single-sided welding. The heat generated during the welding process can easily cause the non-welded end to warp after being heated, affecting the welding quality and product performance. At the same time, the existing welding structure is mostly a "P" shaped design, which has a limited welding area and insufficient welding strength. In addition, heat is easily concentrated during the welding process, resulting in thermal damage to the welding area.

[0046] In view of the above, this application is hereby submitted.

[0047] An electronic device comprising a resilient electrical contact terminal and a substrate, wherein the resilient electrical contact terminal is soldered to the substrate.

[0048] The substrate includes, but is not limited to, printed circuit boards.

[0049] Please see Figure 1 as well as Figure 2 The flexible electrical contact terminal 1000 includes a flexible core 10 and a conductive layer 20.

[0050] The elastic core 10 imparts elasticity to the elastic electrical contact terminal 1000.

[0051] The conductive layer 20 includes a first wall 21, second walls 22 connected to both sides of the first wall 21 and forming an angle with it, and an extension wall 23 connected to the other end of the second wall 22 and forming an angle with it. The angle can be an acute angle, an obtuse angle, or a right angle. The first wall 21 and the second wall 22 are not in the same plane, and the second wall 22 and the extension wall 23 are not in the same plane. The first wall 21 and the two second walls 22 together define an accommodating chamber 24 with an opening.

[0052] The elastic core 10 fills the receiving chamber 24, and each of the outer walls 23 extends in a direction away from the receiving chamber 24. Each of the outer walls 23 is provided with a welding area 231.

[0053] It should be noted that the included angle between the first wall 21 and the second wall 22, and the included angle between the second wall 22 and the extension, are any of the acute, right, and obtuse angles, and can be selected according to actual needs.

[0054] Through the improvement of the structure of the conductive layer 20, the conductive layer 20 is generally cap-shaped, with two outer epitaxial walls 23 located on both sides of the receiving chamber 24. Since the epitaxial walls 23 have welding areas 231, the elastic electrical contact terminal 1000 used in this application is fixed to the substrate by double-sided welding on both sides of the receiving chamber 24. This not only avoids the problems of heat concentration, insufficient welding strength, and warping of the non-welded ends due to heat during the welding process, but also effectively increases the welding area compared to single-sided welding, improves the welding strength between the elastic electrical contact terminal 1000 and the substrate, and further helps to disperse the heat during the welding process, avoiding thermal damage to the welding area 231. The combined effect effectively improves the welding stability and welding quality between the elastic electrical contact terminal 1000 and the substrate.

[0055] To improve the conductivity of the conductive layer 20, the first wall 21, the second wall 22, and the epitaxial wall 23 are integrally formed.

[0056] For example, the conductive layer 20 is obtained by bending, wherein the conductive layer 20 has a first wall 21, a second wall 22 bent from both ends of the first wall 21 via a first corner portion, and an extension wall 23 bent outward from the second corner portion 232 from the end of the second wall 22 on the side opposite to the first wall 21.

[0057] In some embodiments, please continue reading Figure 1 as well as Figure 2 The outer wall 23 has a second corner portion 232 that is connected to the second wall 22 and forms a corner, and a support portion 233 that is connected to the second corner portion 232 and extends in a direction away from the second corner portion 232. The welding area 231 is located in the support portion 233.

[0058] It is understandable that the conductive layer 20 is obtained by bending, and its second corner 232 is actually a smooth transition. There is a triangular area filled with elastic core 10 between the horizontal plane where the second corner 232 and the bottom surface of the support 233 are located. If the welding area 231 is located at the second corner 232, it will affect the elasticity of part of the elastic core 10, affect the service life of the elastic electrical contact terminal 1000, and affect the welding effect.

[0059] Therefore, the welding area 231 is located in the support part 233, that is, there is a certain distance between the welding area 231 and the elastic core 10. This avoids the peak temperature during welding from being too high and affecting the performance of the elastic core 10, and forms a larger operating space, which is conducive to improving the overall welding effect and extending the service life of the elastic electrical contact terminal 1000.

[0060] In some embodiments, each welding area 231 has a first edge close to the receiving chamber 24 and a second edge away from the receiving chamber 24, and the shortest straight distance between the first edge and the second edge is L, where L≥2mm.

[0061] For example, the shortest straight-line distance L between the first edge and the second edge is any value or any two values ​​among 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 20mm, etc., and can be selected according to actual needs.

[0062] By controlling the shortest straight distance between the first edge and the second edge to meet the above parameter requirements, at least two rows of solder points can be set in the welding area 231 along the extension direction of the extension wall, which is beneficial to improving the welding strength between the elastic electrical contact terminal 1000 and the substrate.

[0063] Furthermore, a gap is left between the first edge and the second corner 232, which can extend the distance between the welding area 231 and the second wall 22, reduce the temperature conducted to the second wall 22 during welding, and thus reduce the influence of welding temperature on the elastic core 10.

[0064] In some embodiments, please continue reading Figure 1 as well as Figure 2 The flexible electrical contact terminal 1000 also includes a first adhesive layer 30, which is located between the flexible core 10 and the conductive layer 20 to bond the flexible core 10 and the conductive layer 20.

[0065] By bonding the elastic core 10 and the conductive layer 20 together with the first adhesive layer 30, the elastic core 10 can be stably fixed in the receiving chamber 24, preventing the elastic core 10 and the conductive layer 20 from shifting.

[0066] The first adhesive layer 30 can be disposed separately between the first wall 21 and the elastic core 10, or separately between the second wall 22 and the elastic core 10, or disposed between the first wall 21 and the elastic core 10, and also disposed between the second wall 22 and the elastic core 10.

[0067] In some embodiments, the first adhesive layer 30 is located between the elastic core 10 and the first wall 21.

[0068] Since the second wall 22 has a limiting effect on the elastic core 10 itself, the above-mentioned arrangement can not only limit the lateral displacement of the elastic core 10, but also simplify the structure of the elastic electrical contact terminal 1000 and simplify the manufacturing process.

[0069] In some embodiments, the elastic core 10 includes: a polymer elastic core 11, a polymer coating film 12, and a second adhesive layer.

[0070] The polymer coating film 12 covers the surface of the polymer elastic core 11; the second adhesive layer is located between the polymer elastic core 11 and the polymer coating film 12 to bond the polymer elastic core 11 and the polymer coating film 12.

[0071] The polymer coating film 12 can cover the surface of the polymer elastic core, either completely or partially, but preferably completely.

[0072] It is understandable that, since the elastic electrical contact terminal 1000 needs to conduct electricity and generate heat, the polymer elastic core 11 and the polymer coating film 12 are both made of heat-resistant polymer materials.

[0073] With the above configuration, the polymer elastic core 11 and the polymer coating film 12 are bonded together by the second adhesive layer to prevent them from shifting. At the same time, the polymer coating film 12 covers the surface of the polymer elastic core, which not only provides mechanical strength and has a reinforcing effect, but also provides a carrier for the conductive layer 20 to be plated, making the plating process easier. In addition, the polymer coating film 12 should have high temperature resistance.

[0074] In some embodiments, the polymeric elastic core 11 comprises polyurethane and / or silicone.

[0075] Polyurethane or silicone, among others, has good elasticity and heat resistance.

[0076] Among them, polyurethane includes, but is not limited to, Poron brand polyurethane cotton, which has high resilience, low density and low stress.

[0077] In some embodiments, the polymer coating film 12 comprises PI.

[0078] PI not only provides mechanical strength and reinforcement, but also has excellent high-temperature resistance because the 1000 flexible electrical contact terminal involves laser welding / reflow welding and other steps in actual application, which require high welding temperatures. Ordinary plastics cannot withstand these temperatures.

[0079] In some embodiments, the polymer elastic core 11 has a first end and a second end opposite to each other, the first end being located on the side close to the first wall 21.

[0080] The second adhesive layer includes a first portion 131 and a second portion 133. The first portion 131 is located between the first end and the polymer coating film 12, and the second portion 133 is located between the second end and the polymer coating film 12.

[0081] Since the second wall 22 has a limiting effect on the elastic core 10 itself, the above-mentioned arrangement can not only limit the lateral displacement between the bottom of the polymer elastic core 11 and the polymer coating film 12, but also simplify the structure of the elastic electrical contact terminal 1000 and simplify the manufacturing process.

[0082] In some embodiments, the elastic core 10 further includes a polymer support layer 14 disposed between the elastic core 10 and the conductive layer 20, and / or, the polymer support layer 14 is disposed between the polymer elastic core 11 and the first portion 131.

[0083] like Figure 1 as well as Figure 2 As shown, the polymer support layer 14 is disposed between the polymer elastic core 11 and the first part 131.

[0084] Understandably, since the flexible electrical contact terminal 1000 needs to conduct electricity and generate heat, the polymer support layer 14 is made of a high-temperature resistant polymer material.

[0085] Since the conductive layer 20 of the elastic electrical contact terminal 1000 is very thin, when the polymer elastic core 11 has a low density and is easily deformed, wrinkles will form at the top of the first wall 21 and the second wall 22 of the conductive layer 20. Therefore, the polymer support layer 14 can effectively support the polymer elastic core 11 and avoid wrinkles. At the same time, the polymer support layer 14 is disposed between the polymer elastic core 11 and the first part 131, which has a simple structure and is easy to process and manufacture.

[0086] In some embodiments, the polymer support layer 14 comprises PET.

[0087] In some embodiments, please continue reading Figure 1 as well as Figure 2 The welding area 231 has a first surface and a second surface opposite to each other, the second surface being used to contact the substrate.

[0088] The second surface of the welding area 231 is provided with a third adhesive layer 40.

[0089] It is understood that the third adhesive layer 40 is used to pre-fix the elastic electrical contact terminal 1000 and the substrate. Therefore, in actual use, the thickness of the third adhesive layer 40 is very thin, and it has little or no impact on the welding effect. For example, the thickness of the third adhesive layer 40 is 0.004 mm, 0.005 mm, 0.006 mm, 0.007 mm, 0.008 mm, 0.009 mm, or 0.01 mm, etc.

[0090] By setting the third adhesive layer 40, the elastic electrical contact terminal 1000 can be bonded to the substrate for positioning, and then welded, which is beneficial for achieving automated and precise assembly before welding.

[0091] It should be noted that during the sale of the flexible electrical contact terminal 1000, a release film may be provided on the side of the third adhesive layer 40 opposite to the welding area 231. When needed, the release film is removed and the terminal is bonded to the substrate before welding.

[0092] In some embodiments, please continue reading Figure 1 as well as Figure 2 The first surface of the welding area 231 is provided with a metal auxiliary layer 50, and the laser absorption rate of the metal auxiliary layer 50 is greater than that of the epitaxial wall 23.

[0093] With the above setup, a laser is emitted by the laser welding device, allowing the laser to pass through the metal auxiliary layer 50, the epitaxial wall 23, and the substrate in sequence, thereby achieving double-sided laser welding.

[0094] For example, the conductive layer 20 is made of gold-plated copper foil, and the metal auxiliary layer 50 is made of nickel-plated copper foil.

[0095] The metal auxiliary layer 50 can be bonded to the first surface of the welding area 231 using a fourth adhesive layer 60.

[0096] In this application, the first adhesive layer 30, the second adhesive layer, the third adhesive layer 40, and the fourth adhesive layer 60 may all be pressure-sensitive adhesives.

[0097] In some embodiments, the surface resistance of the conductive layer 20 is ≤0.03Ω / □.

[0098] By controlling the surface resistance of the conductive layer 20 within the aforementioned range, the conductive layer 20 exhibits ultra-low resistance, excellent conductivity, and oxidation resistance, which is beneficial for improving the conductivity and durability of the flexible electrical contact terminal 1000.

[0099] In some embodiments, the conductive layer 20 includes gold-plated copper foil or nickel-plated copper foil.

[0100] The conductive layer 20 of the above-mentioned material has ultra-low resistance, good conductivity and oxidation resistance, which is beneficial to improving the conductivity and durability of the elastic electrical contact terminal 1000.

[0101] In summary, the flexible electrical contact terminal and electrical device provided in this application improve the conductive layer structure of the flexible electrical contact terminal, making the conductive layer generally have a cap-shaped structure. The two outer walls are located on both sides of the receiving chamber. Since each outer wall has a welding area, the flexible electrical contact terminal is actually fixed to the substrate by double-sided welding on both sides of the receiving chamber. This not only avoids the problems of heat concentration, insufficient welding strength, and warping of the non-welded end due to heat during the welding process, but also effectively increases the welding area and improves the welding strength between the flexible electrical contact terminal and the substrate compared to single-sided welding. Furthermore, it helps to disperse the heat during the welding process and avoids thermal damage to the welding area.

[0102] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A flexible electrical contact terminal for mounting on a substrate, characterized in that, include: The elastic core imparts elasticity to the elastic electrical contact terminal; as well as The conductive layer includes a first wall, second walls connected to both sides of the first wall and forming an angle with it, and an extensional wall connected to the other end of the second wall and forming an angle with it. The first wall and the two second walls together define a receiving chamber with an opening. The elastic core fills the receiving cavity, and each of the outer walls extends in a direction away from the receiving cavity, and each of the outer walls is provided with a welding area.

2. The flexible electrical contact terminal according to claim 1, characterized in that, The outer wall has a corner portion connected to the second wall and forming a corner, and a support portion connected to the corner portion and extending in a direction away from the receiving chamber, the welding area being located in the support portion; and / or, Each of the welding areas has a first edge close to the receiving chamber and a second edge away from the receiving chamber, and the shortest straight-line distance between the first edge and the second edge is ≥2mm.

3. The flexible electrical contact terminal according to claim 1, characterized in that, The elastic electrical contact terminal further includes a first adhesive layer, which is located between the elastic core and the conductive layer to bond the elastic core and the conductive layer.

4. The flexible electrical contact terminal according to claim 3, characterized in that, The first adhesive layer is located between the elastic core and the first wall.

5. The flexible electrical contact terminal according to claim 1, characterized in that, The elastic core includes: Polymer elastic core; A polymer coating film is applied to the surface of the polymer elastic core; and The second adhesive layer is located between the polymer elastic core and the polymer coating film to bond the polymer elastic core and the polymer coating film.

6. The flexible electrical contact terminal according to claim 5, characterized in that, The polymer elastic core has a first end and a second end opposite to each other, with the first end located on the side close to the first wall; The second adhesive layer includes a first portion and a second portion, wherein the first portion is located between the first end and the polymer coating film, and the second portion is located between the second end and the polymer coating film.

7. The flexible electrical contact terminal according to claim 1, characterized in that, The elastic core also includes a polymer support layer; The polymer support layer is disposed between the elastic core and the conductive layer.

8. The flexible electrical contact terminal according to any one of claims 1-7, characterized in that, The welding area has a first surface and a second surface opposite to each other, the second surface being used to contact the substrate; Wherein, the first surface is provided with a metal auxiliary layer, and the laser absorption rate of the metal auxiliary layer is greater than the laser absorption rate of the epitaxial wall; and / or, The second surface is provided with a third adhesive layer.

9. The flexible electrical contact terminal according to any one of claims 1-7, characterized in that, The surface resistance of the conductive layer is ≤0.03Ω / □; and / or, The conductive layer is gold-plated copper foil.

10. An electronic device, characterized in that, It includes the flexible electrical contact terminal as described in any one of claims 1-9 and a substrate, wherein the welding area is welded to the substrate.

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