Connection terminal and electrical connector

Abstract

The present disclosure provides a connecting terminal and an electrical connector, and belongs to the technical field of electrical connectors. The connecting terminal comprises a substrate, a conductive sheet and a coating. The conductive sheet is connected with the substrate. The coating is coated on the side of the conductive sheet away from the substrate. The coating comprises a plurality of first electrolyte-resistant layers and at least one second electrolyte-resistant layer. The plurality of first electrolyte-resistant layers and the at least one second electrolyte-resistant layer are stacked in the thickness direction of the conductive sheet. The at least one second electrolyte-resistant layer is located between two adjacent first electrolyte-resistant layers. The sum of the thicknesses of the plurality of first electrolyte-resistant layers and the at least one second electrolyte-resistant layer is less than a preset thickness value. By using the present disclosure, the production cost of the connecting terminal can be reduced.

Description

Technical Field

[0001] This disclosure relates to the field of electrical connector technology, and particularly to a connection terminal and an electrical connector. Background Technology

[0002] For electronic devices such as mobile phones, liquid may enter the charging port. Charging before the liquid is completely dry may cause electrolysis at the charging terminals, leading to damage to the electronic device.

[0003] To avoid the above problems, an electrolysis-resistant layer is coated on the surface of the connection terminals.

[0004] However, the electrolysis-resistant layer is usually made of platinum, which is expensive. Furthermore, to ensure that liquids cannot penetrate through the electrolysis-resistant layer, it needs to be quite thick. This hinders the design of thinner and lighter devices and also results in a larger amount of precious metals being used, leading to higher costs. Utility Model Content

[0005] This disclosure provides a connecting terminal and an electrical connector, which can solve the technical problems existing in related technologies. The technical solution of the connecting terminal and electrical connector is as follows:

[0006] In a first aspect, this disclosure provides a connection terminal, the connection terminal comprising a substrate, a conductive sheet, and a coating;

[0007] The conductive sheet is connected to the substrate;

[0008] The coating is applied to the side of the conductive sheet away from the substrate. The coating includes a plurality of first electrolytic-resistant layers and at least one second electrolytic-resistant layer. The plurality of first electrolytic-resistant layers and the at least one second electrolytic-resistant layer are stacked in the thickness direction of the conductive sheet, and the at least one second electrolytic-resistant layer is located between two adjacent first electrolytic-resistant layers. The sum of the thicknesses of the plurality of first electrolytic-resistant layers and the at least one second electrolytic-resistant layer is less than a preset thickness value.

[0009] In one possible implementation, the first electrolysis-resistant layer has stronger electrolysis resistance than the second electrolysis-resistant layer and / or the hardness of the second electrolysis-resistant layer is greater than the hardness of the first electrolysis-resistant layer.

[0010] In one possible implementation, the first electrolytic-resistant layer is a single metallic layer, the second electrolytic-resistant layer is an alloy layer, and the crystallinity of the second electrolytic-resistant layer is less than that of the first electrolytic-resistant layer.

[0011] In one possible implementation, the coating comprises two first electrolytic-resistant layers and one second electrolytic-resistant layer, wherein the thickness of the first electrolytic-resistant layer closer to the conductive sheet is greater than the thickness of the first electrolytic-resistant layer farther from the conductive sheet.

[0012] In one possible implementation, the first electrolysis-resistant layer is a platinum layer, and the second electrolysis-resistant layer is one of a platinum-ruthenium alloy layer, a platinum-iridium alloy layer, and a platinum-titanium alloy layer.

[0013] In one possible implementation, the hardness of the first electrolytic layer is greater than that of the second electrolytic layer and / or the electrolytic resistance of the second electrolytic layer is stronger than that of the first electrolytic layer.

[0014] In one possible implementation, the first electrolytic-resistant layer is an alloy layer, the second electrolytic-resistant layer is a metallic elemental layer, and the crystallinity of the first electrolytic-resistant layer is less than that of the second electrolytic-resistant layer.

[0015] In one possible implementation, the coating comprises two first electrolytic-resistant layers and one second electrolytic-resistant layer, wherein the thickness of the first electrolytic-resistant layer farther from the conductive sheet is greater than the thickness of the first electrolytic-resistant layer closer to the conductive sheet.

[0016] In one possible implementation, the first electrolytic-resistant layer is one of a platinum-ruthenium alloy layer, a platinum-iridium alloy layer, and a platinum-titanium alloy layer, and the second electrolytic-resistant layer is a platinum layer.

[0017] In one possible implementation, the sum of the thicknesses lies within the range of [0.5 μm, 0.75 μm).

[0018] In one possible implementation, the coating further includes a substrate layer located on the side of the conductive sheet opposite to the substrate and bonded to the conductive sheet.

[0019] In one possible implementation, the coating further includes a transition layer located between the substrate layer and the first electrolytic-resistant layer closest to the conductive sheet.

[0020] In one possible implementation, the coating further includes an abrasion-resistant layer located on the side of the first electrolytic-resistant layer furthest from the conductive sheet.

[0021] In one possible implementation, the coating further includes a conductive lubricating layer located on the side of the wear-resistant layer opposite to the conductive sheet.

[0022] In a second aspect, this disclosure provides an electrical connector that includes the connection terminals found in the first aspect and its possible implementations.

[0023] The technical solution provided in this disclosure includes at least the following beneficial effects.

[0024] This disclosure provides a connection terminal in which the coating includes a structure of multiple first electrolytic-resistant layers and at least one second electrolytic-resistant layer stacked and arranged in a "sandwich" shape. Since the first and second electrolytic-resistant layers are of different compositions, the lattice defects within them are difficult to align continuously in the vertical direction. This forces the corrosive medium to diffuse along a tortuous and circuitous path to the conductive sheet. It is easy to understand that, compared to using a single-component electrolytic-resistant layer, at the same thickness, the corrosive medium has a greater difficulty reaching the conductive sheet corresponding to the embodiment of this disclosure. In other words, this reduces the thickness required for the multiple first and at least one second electrolytic-resistant layers in the coating to meet the electrolytic resistance requirements. Furthermore, since the sum of the thicknesses of the multiple first and at least one second electrolytic-resistant layers is less than a preset thickness, the amount of precious metal used in the coating can be limited to a smaller range, thereby reducing the production cost of the connection terminal.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. In the drawings:

[0027] Figure 1 This is a schematic diagram of a connection terminal provided in an embodiment of this disclosure;

[0028] Figure 2 This is a two-dimensional schematic diagram of a coating provided in an embodiment of this disclosure;

[0029] Figure 3 This is a two-dimensional schematic diagram of a coating provided in an embodiment of this disclosure;

[0030] Figure 4 This is a two-dimensional schematic diagram of a coating provided in an embodiment of this disclosure;

[0031] Figure 5 This is a two-dimensional schematic diagram of a coating provided in an embodiment of this disclosure;

[0032] Figure 6 This is a two-dimensional schematic diagram of a coating provided in an embodiment of this disclosure;

[0033] Figure 7 This is a two-dimensional schematic diagram of a coating provided in an embodiment of this disclosure;

[0034] Figure 8 This is a two-dimensional schematic diagram of a coating provided in an embodiment of this disclosure.

[0035] Legend

[0036] 1. Substrate;

[0037] 2. Conductive sheet;

[0038] 3. Coating;

[0039] 31. First electrolysis resistant layer; 32. Second electrolysis resistant layer; 33. Substrate layer; 34. Transition layer; 35. Wear resistant layer; 36. Conductive lubricating layer.

[0040] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings.

[0042] The terminology used in the embodiments of this disclosure is for illustrative purposes only and is not intended to limit the disclosure. Unless otherwise defined, the technical or scientific terms used herein should be understood in their ordinary sense by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “a” or “one,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected,” “linked,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0043] With the continuous development of electronic technology, users are using mobile phones and other electronic devices more and more frequently. During use, users may accidentally drop their devices into water or spill water on them, allowing liquid to enter the charging port. If the user charges the device before the liquid is completely dry, electrolysis will occur at the charging terminals, damaging the electronic device. To avoid this problem, manufacturers typically coat the surface of the connecting terminals with an electrolysis-resistant layer during the manufacturing process. However, this electrolysis-resistant layer is usually made of platinum, which is expensive. To ensure sufficient electrolysis resistance to prevent liquid penetration, the electrolysis-resistant layer is often quite thick, resulting in a large amount of precious metal used and higher costs.

[0044] To address the aforementioned problems, this disclosure provides a connection terminal, such as... Figure 1 and Figure 2 As shown, the connection terminal includes a substrate 1, a conductive sheet 2, and a coating 3.

[0045] Among them, see Figure 1 ( Figure 1 (This is a schematic diagram of the connection terminal structure). The substrate 1 and the conductive sheet 2 are both rectangular plate structures. The width of the conductive sheet 2 is smaller than the width of the substrate 1. There are usually multiple conductive sheets 2. The multiple conductive sheets 2 are distributed at intervals along the width direction of the substrate 1, and the multiple conductive sheets 2 are respectively connected to the substrate 1.

[0046] For example, the substrate 1 can be plastic, and the conductive sheet 2 can be made of copper or stainless steel.

[0047] In this process, coating 3 is applied to the side of conductive sheet 2 facing away from substrate 1, see [reference]. Figure 2 ( Figure 2 (This is a schematic diagram of the coating 3 in the thickness direction). The coating 3 includes multiple first electrolytic-resistant layers 31 and at least one second electrolytic-resistant layer 32. The first electrolytic-resistant layers 31 and the second electrolytic-resistant layers 32 are electrolytic-resistant layers with different compositions. Figure 1 and Figure 2 Multiple first electrolytic-resistant layers 31 and at least one second electrolytic-resistant layer 32 are stacked in the thickness direction of the conductive sheet 2, and at least one second electrolytic-resistant layer 32 is located between two adjacent first electrolytic-resistant layers 31. The sum of the thicknesses of the multiple first electrolytic-resistant layers 31 and at least one second electrolytic-resistant layer 32 is less than a preset thickness value.

[0048] The specific structure of coating 3 will be described in detail below:

[0049] In some possible embodiments, the first electrolytic layer 31 has stronger electrolytic resistance than the second electrolytic layer 32. Thus, the first electrolytic layer 31 has stronger electrolytic resistance, and at least one first electrolytic layer 31 is located on the side of the second electrolytic layer 32 away from the conductive sheet 2, effectively preventing corrosive media from entering. Furthermore, this embodiment can be applied to devices that are relatively more likely to come into contact with liquids, i.e., in high-electrolysis applications, such as the connection terminals of electronic devices like mobile phones.

[0050] In some examples, the hardness of the second electrolytic-resistant layer 32 is greater than that of the first electrolytic-resistant layer 31. Thus, with at least one second electrolytic-resistant layer 32 located between two adjacent first electrolytic-resistant layers 31, the second electrolytic-resistant layer 32 can act as a "skeleton" to provide support and reduce the deformation of the first electrolytic-resistant layers 31 caused by friction. Furthermore, as the number of times the user charges the device accumulates, the first electrolytic-resistant layer 31 may wear away through repeated friction. After the first electrolytic-resistant layer 31 wears away, the higher hardness of the second electrolytic-resistant layer 32 can effectively resist friction, thereby extending the service life of the connection terminal.

[0051] In some examples, the first electrolytic layer 31 is a single metallic layer, and the second electrolytic layer 32 is an alloy layer, with the crystallinity of the second electrolytic layer 32 being lower than that of the first electrolytic layer 31. In practice, the lower crystallinity of the second electrolytic layer 32 results in a smoother surface, allowing the first electrolytic layer 31 coated on the surface of the second electrolytic layer 32 to form crystals more stably. This reduces crystallization defects within the first electrolytic layer 31. Furthermore, the reduced crystallization defects in the first electrolytic layer 31 make it more difficult for corrosive media to penetrate, thereby improving the electrolytic resistance of the first electrolytic layer 31.

[0052] In some examples, such as Figure 3 As shown, coating 3 includes two first electrolysis-resistant layers 31 and one second electrolysis-resistant layer 32.

[0053] Specifically, see Figure 3 The second electrolytic-resistant layer 32 is located between the two first electrolytic-resistant layers 31. Furthermore, in the thickness direction of the conductive sheet 2, the thickness of the first electrolytic-resistant layer 31 closer to the conductive sheet 2 is greater than the thickness of the first electrolytic-resistant layer 31 farther from the conductive sheet 2. For ease of explanation, the first electrolytic-resistant layer 31 farther from the conductive sheet 2 will be referred to as the top first electrolytic-resistant layer 31, and the first electrolytic-resistant layer 31 closer to the conductive sheet 2 will be referred to as the bottom first electrolytic-resistant layer 31.

[0054] In practice, referring to the above example, the top first electrolytic layer 31 has strong electrolytic resistance due to fewer internal crystal defects. When charging is performed while liquid enters the charging port and is not completely dry, the top first electrolytic layer 31 can prevent the liquid (i.e., corrosive medium) from contacting the conductive sheet 2, thus avoiding damage to the connection terminal. As the electronic device is charged repeatedly, the top first electrolytic layer 31 gradually wears away. The second electrolytic layer 32, with its higher hardness, has strong wear resistance and can delay the process of coating wear. Continuing with the accumulation of charging cycles, the second electrolytic layer 32 also gradually wears away, at which point the bottom first electrolytic layer 31 is exposed. The first electrolytic layer 31 is relatively thick, which allows the bottom first electrolytic layer 31 to still have strong electrolytic resistance, thus effectively preventing corrosive media from entering.

[0055] In some examples, the first electrolytic-resistant layer 31 is a platinum layer, and the second electrolytic-resistant layer 32 is one of a platinum-ruthenium alloy layer, a platinum-iridium alloy layer, and a platinum-titanium alloy layer.

[0056] For example, when the second electrolytic-resistant layer 32 is a platinum-ruthenium alloy layer, the proportion of ruthenium metal can be in the range of [8%, 12%]; when the second electrolytic-resistant layer 32 is a platinum-iridium alloy layer, the proportion of iridium metal can be in the range of [1%, 3%]; and when the second electrolytic-resistant layer 32 is a platinum-titanium alloy layer, the proportion of titanium metal can be in the range of [0.3%, 1%].

[0057] In some possible embodiments, the hardness of the first electrolytic layer 31 is greater than that of the second electrolytic layer 32. This gives the first electrolytic layer 31 stronger wear resistance, and the fact that at least one of the first electrolytic layer 31 is displaced from the second electrolytic layer 32 away from the conductive sheet 2 can delay frictional wear caused by charging and plugging operations. Furthermore, this embodiment can be applied to devices that are more prone to wear, i.e., to high-friction applications, such as the connection terminals at the charging cable heads of electronic devices like mobile phones.

[0058] In some examples, the second electrolytic layer 32 exhibits stronger electrolytic resistance than the first electrolytic layer 31. Thus, in the thickness direction, the first electrolytic layer 31 located on the side of the second electrolytic layer 32 closer to the conductive sheet 2 can act as a support structure, reducing deformation of the second electrolytic layer 32 due to friction. The first electrolytic layer 31 located on the side of the second electrolytic layer 32 furthest from the conductive sheet 2 can delay frictional losses caused by charging and unplugging operations. When charging occurs while liquid has entered the charging port and is not completely dry, the first electrolytic layer 31 located on the side of the second electrolytic layer 32 furthest from the conductive sheet 2 may undergo electrolysis; subsequently, the second electrolytic layer 32, with its stronger electrolytic resistance, can effectively prevent corrosive media from entering.

[0059] In some examples, the first electrolytic layer 31 is an alloy layer, and the second electrolytic layer 32 is a metallic elemental layer, with the crystallinity of the first electrolytic layer 31 being lower than that of the second electrolytic layer 32. In practice, the lower crystallinity of the first electrolytic layer 31 results in a smoother surface, allowing the second electrolytic layer 32 coated on the surface of the first electrolytic layer 31 to form crystals more stably. This reduces crystallization defects within the second electrolytic layer 32. Furthermore, the reduced crystallization defects in the second electrolytic layer 32 make it more difficult for corrosive media to penetrate, thereby improving the electrolytic resistance of the second electrolytic layer 32.

[0060] In some examples, such as Figure 4 As shown, coating 3 includes two first electrolysis-resistant layers 31 and one second electrolysis-resistant layer 32.

[0061] Specifically, see Figure 4 The second electrolytic layer 32 is located between the two first electrolytic layers 31, and in the thickness direction of the conductive sheet 2, the thickness of the top first electrolytic layer 31 is greater than the thickness of the bottom first electrolytic layer 31.

[0062] In practice, referring to the above example, the top first electrolytic layer 31 has a high hardness and strong wear resistance, and its thickness is also relatively large. Therefore, the top first electrolytic layer 31 can significantly delay the process of coating wear and disappearance. When liquid enters the charging port and charging is performed before it is completely dry, the top first electrolytic layer 31 may undergo electrolysis, exposing the second electrolytic layer 32. The second electrolytic layer 32 has strong electrolytic resistance due to fewer internal crystal defects, effectively preventing corrosive media. As the electronic device accumulates charging cycles, the second electrolytic layer 32 gradually wears away, exposing the bottom first electrolytic layer 31. Due to its high hardness and strong wear resistance, the bottom first electrolytic layer 31 can still delay the process of coating wear and disappearance, preventing the conductive sheet 2 from directly contacting the charging head and suffering frictional wear.

[0063] In some examples, the first electrolytic-resistant layer 31 is one of a platinum-ruthenium alloy layer, a platinum-iridium alloy layer, and a platinum-titanium alloy layer, and the second electrolytic-resistant layer 32 is a platinum layer.

[0064] For example, when the first electrolytic-resistant layer 31 is a platinum-ruthenium alloy layer, the proportion of ruthenium metal can be in the range of [8%, 12%]; when the first electrolytic-resistant layer 31 is a platinum-iridium alloy layer, the proportion of iridium metal can be in the range of [1%, 3%]; and when the first electrolytic-resistant layer 31 is a platinum-titanium alloy layer, the proportion of titanium metal can be in the range of [0.3%, 1%].

[0065] For example, each pair of adjacent first electrolytic layers 31 may have different compositions. For instance, in the example above, the top first electrolytic layer 31 is a platinum-iridium alloy layer and the bottom first electrolytic layer 31 is a platinum-ruthenium alloy layer. This disclosure does not limit the specific composition of the first electrolytic layer 31.

[0066] In some possible embodiments, the preset thickness value is 0.75 μm.

[0067] Experimental data shows that when a single platinum layer is used as the electrolytic resistance layer, a platinum layer thickness of 0.75 μm can meet the requirements for electrolytic resistance and wear resistance. However, the technical solution provided in this disclosure, employing a coating 3 comprising multiple first electrolytic resistance layers 31 stacked in a "sandwich" shape and at least one second electrolytic resistance layer 32, achieves the same electrolytic resistance and wear resistance as a single platinum layer with a thickness of 0.75 μm when the sum of the thicknesses of the multiple first electrolytic resistance layers 31 and at least one second electrolytic resistance layer 32 is 0.5 μm, reducing the precious metal thickness by more than 30%. Conversely, when the sum of the thicknesses of the multiple first electrolytic resistance layers 31 and at least one second electrolytic resistance layer 32 is less than 0.5 μm, the corresponding electrolytic resistance and wear resistance requirements cannot be met.

[0068] Furthermore, considering the errors caused by the processing technology, the sum of the thicknesses of the plurality of first electrolytic-resistant layers 31 and at least one second electrolytic-resistant layer 32 can be set to be slightly greater than 0.5 μm. For example, the sum of the thicknesses of the plurality of first electrolytic-resistant layers 31 and at least one second electrolytic-resistant layer 32 can be located in the range of [0.5 μm, 0.75 μm).

[0069] In some possible embodiments, such as Figure 5 As shown, the coating 3 also includes a substrate layer 33, which is located on the side of the conductive sheet 2 away from the substrate 1 and is attached to the conductive sheet 2.

[0070] For example, the substrate layer 33 can be a nickel single layer or a nickel alloy layer. Specifically, the nickel alloy layer can be one of a nickel-phosphorus alloy layer, a nickel-tungsten alloy layer, or a nickel-tin alloy layer, but is not limited thereto. Those skilled in the art can set the material of the substrate layer 33 according to actual needs, and this disclosure does not limit this.

[0071] In some possible embodiments, such as Figure 6 As shown, coating 3 also includes a transition layer 34, which is located between substrate layer 33 and first electrolytic-resistant layer 31 closest to conductive sheet 2.

[0072] For example, the transition layer 34 can be a gold elemental layer or a gold alloy layer. The gold alloy layer can be a gold-cobalt alloy layer or a gold-nickel alloy layer, but is not limited thereto. Those skilled in the art can set the material of the transition layer 34 according to actual needs. This disclosure does not limit this aspect.

[0073] In some possible embodiments, such as Figure 7 As shown, coating 3 also includes a wear-resistant layer 35, which is located on the side of the first electrolytic layer 31 furthest from the conductive sheet 2 that is opposite to the conductive sheet 2.

[0074] For example, the wear-resistant layer 35 can be one of a palladium elemental layer, a nickel elemental layer, a palladium alloy layer, and a nickel alloy layer. The palladium alloy layer and the nickel alloy layer can be a palladium-nickel alloy, a palladium-silver alloy, etc., but are not limited thereto. Those skilled in the art can set the material of the wear-resistant layer 35 according to actual needs, and this disclosure does not limit this.

[0075] In some examples, coating 3 also includes a conductive lubricating layer 36, such as Figure 8 As shown, the conductive lubricating layer 36 is located on the side of the wear-resistant layer 35 away from the conductive sheet 2 and is connected to the wear-resistant layer 35.

[0076] For example, the conductive lubricating layer 36 can be a gold elemental layer or a gold alloy layer. The gold alloy layer can be a gold-cobalt alloy layer or a gold-nickel alloy layer, but it is not limited thereto. Those skilled in the art can set the material of the conductive lubricating layer 36 according to actual needs. This disclosure does not limit this aspect.

[0077] The technical solutions provided in this disclosure include at least the following beneficial effects.

[0078] This disclosure provides a connection terminal in which the coating 3 includes a structure of multiple first electrolytic-resistant layers 31 and at least one second electrolytic-resistant layer 32 stacked and arranged in a "sandwich" shape. Since the first and second electrolytic-resistant layers 31 and 32 are electrolytic-resistant layers of different compositions, the lattice defects within them are difficult to align continuously in the vertical direction. This forces the corrosive medium to diffuse along a tortuous and circuitous path to the conductive sheet 2. It is easy to understand that, compared to using a single-component electrolytic-resistant layer, at the same thickness, the corrosive medium has a greater difficulty reaching the conductive sheet 2 corresponding to this disclosure embodiment. In other words, this effectively reduces the thickness required for the multiple first electrolytic-resistant layers 31 and at least one second electrolytic-resistant layer 32 in the coating 3 to meet the electrolytic resistance requirements. Furthermore, the sum of the thicknesses of the multiple first electrolytic-resistant layers 31 and at least one second electrolytic-resistant layer 32 is less than a preset thickness, which limits the amount of precious metal used in the coating 3 to a smaller range, thereby reducing the production cost of the connection terminal.

[0079] This disclosure provides an electrical connector that includes the connection terminals described above.

[0080] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A connecting terminal, characterized in that, The connection terminal includes a substrate (1), a conductive sheet (2), and a coating (3); The conductive sheet (2) is connected to the substrate (1); The coating (3) is applied to the side of the conductive sheet (2) away from the substrate (1). The coating (3) includes a plurality of first electrolytic layers (31) and at least one second electrolytic layer (32). The plurality of first electrolytic layers (31) and the at least one second electrolytic layer (32) are stacked in the thickness direction of the conductive sheet (2), and the at least one second electrolytic layer (32) is located between two adjacent first electrolytic layers (31). The sum of the thicknesses of the plurality of first electrolytic layers (31) and the at least one second electrolytic layer (32) is less than a preset thickness value.

2. The connection terminal according to claim 1, characterized in that, The first electrolytic layer (31) has stronger electrolytic resistance than the second electrolytic layer (32) and / or the hardness of the second electrolytic layer (32) is greater than that of the first electrolytic layer (31).

3. The connecting terminal according to claim 2, characterized in that, The first electrolytic-resistant layer (31) is a single metal layer, the second electrolytic-resistant layer (32) is an alloy layer, and the crystal density of the second electrolytic-resistant layer (32) is less than that of the first electrolytic-resistant layer (31).

4. The connecting terminal according to claim 2, characterized in that, The coating (3) includes two first electrolytic layers (31) and a second electrolytic layer (32), and the thickness of the first electrolytic layer (31) closer to the conductive sheet (2) is greater than the thickness of the first electrolytic layer (31) farther away from the conductive sheet (2).

5. The connecting terminal according to claim 4, characterized in that, The first electrolytic-resistant layer (31) is a platinum layer, and the second electrolytic-resistant layer (32) is one of a platinum-ruthenium alloy layer, a platinum-iridium alloy layer, and a platinum-titanium alloy layer.

6. The connecting terminal according to claim 1, characterized in that, The hardness of the first electrolytic layer (31) is greater than that of the second electrolytic layer (32) and / or the electrolytic resistance of the second electrolytic layer (32) is stronger than that of the first electrolytic layer (31).

7. The connecting terminal according to claim 6, characterized in that, The first electrolytic-resistant layer (31) is an alloy layer, the second electrolytic-resistant layer (32) is a metal element layer, and the crystal density of the first electrolytic-resistant layer (31) is less than that of the second electrolytic-resistant layer (32).

8. The connecting terminal according to claim 6, characterized in that, The coating (3) includes two first electrolytic layers (31) and a second electrolytic layer (32), and the thickness of the first electrolytic layer (31) away from the conductive sheet (2) is greater than the thickness of the first electrolytic layer (31) close to the conductive sheet (2).

9. The connecting terminal according to claim 8, characterized in that, The first electrolytic-resistant layer (31) is one of a platinum-ruthenium alloy layer, a platinum-iridium alloy layer, and a platinum-titanium alloy layer, and the second electrolytic-resistant layer (32) is a platinum layer.

10. The connecting terminal according to any one of claims 1 to 9, characterized in that, The sum of the thicknesses is within the range of [0.5μm, 0.75μm).

11. The connection terminal according to claim 1, characterized in that, The coating (3) further includes a substrate layer (33), which is located on the side of the conductive sheet (2) away from the substrate (1) and is attached to the conductive sheet (2).

12. The connection terminal according to claim 11, characterized in that, The coating (3) further includes a transition layer (34) located between the substrate layer (33) and the first electrolytic layer (31) closest to the conductive sheet (2).

13. The connection terminal according to claim 1, characterized in that, The coating (3) further includes a wear-resistant layer (35), which is located on the side of the first electrolytic layer (31) furthest from the conductive sheet (2) away from the conductive sheet (2).

14. The connecting terminal according to claim 13, characterized in that, The coating (3) further includes a conductive lubricating layer (36), which is located on the side of the wear-resistant layer (35) away from the conductive sheet (2).

15. An electrical connector, characterized in that, The electrical connector includes the connection terminals as described in any one of claims 1 to 14.

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