An electrical connection structure

Abstract

The application provides an electric connection structure applied to a circuit board, the circuit board is provided with a plug-in hole, and the electric connection structure comprises a metal spring and a plug-in terminal; wherein the metal spring comprises a base strip and a plurality of elastic sheets connected with the base strip respectively, the base strip is wrapped around the outer periphery of the plug-in terminal, the elastic sheet has a protruding part protruding outward, the protruding part abuts against the surface of the circuit board, and the plug-in terminal is electrically connected with the circuit board through the metal spring. According to the electric connection structure, the plug-in terminal is in good contact with the metal spring, the metal spring has the protruding part protruding outward, the connection with the circuit board is stable, and the plurality of elastic sheets provide a plurality of signal detection points, so that the stability of signal transmission is ensured; meanwhile, the metal spring has good performance, the plug-in terminal can be plugged in and pulled out for many times, and the service life is long.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy vehicle charging, and in particular to an electric connection structure for a circuit board. BACKGROUND

[0002] Since the 1990s, under the dual pressures of energy and environment, the research and development of electric vehicles has entered an active period again. In the nearly 20 years, with the rapid development of various scientific technologies, many technical difficulties of electric vehicles have been gradually solved. Major automobile manufacturers around the world have launched their own electric vehicle products.

[0003] Charging piles, charging guns and charging sockets are the main charging devices of electric vehicles. In the charging device standard, it is required that PE lines must be provided in all charging devices. The PE line is the grounding line of the charging device, which is used for protection of equipment and people when leakage occurs. In the existing charging gun or charging socket, the terminal in the PE line is usually directly welded on the circuit board. If the terminal in the PE line is damaged during use, the terminal in the PE line is not easy to remove during maintenance, which increases the maintenance time and maintenance cost. If the terminal in the PE line is not firmly welded, the terminal in the PE line will not be in good contact with the circuit board, which will affect the stability of the electrical connection between the circuit board and the terminal in the PE line. This leads to equipment leakage and the risk of electric shock injury.

[0004] Therefore, there is an urgent need in the prior art to solve the above problems. SUMMARY

[0005] The present application provides an electric connection structure to ensure the stability of signal transmission between the circuit board and the terminal.

[0006] The specific technical scheme provided by the present application is as follows:

[0007] An electric connection structure applied to a circuit board, the circuit board is provided with a plug-in hole, and the electric connection structure comprises:

[0008] a metal elastic sheet and a plug-in terminal.

[0009] The metal elastic sheet comprises a base strip and a plurality of elastic sheets connected to the base strip, the base strip is wrapped around at least part of the outer periphery of the plug-in terminal, the elastic sheet has a protruding portion protruding outward, and the protruding portion abuts against the surface of the circuit board, and the plug-in terminal is electrically connected to the circuit board through the metal elastic sheet.

[0010] Optionally, the base strip is in a ring structure, and the elastic sheets are distributed on the ring structure.

[0011] Optionally, the elastic sheets are uniformly distributed on the ring structure.

[0012] Optionally, the protruding part is in a circular arc structure or a bending structure.

[0013] Optionally, the bending angle of the bending structure is 90-160°.

[0014] Optionally, the diameter of the circumscribed circle of the plurality of protruding parts is greater than the inner diameter of the insertion hole.

[0015] Optionally, the number of base bands is one, one end of the elastic sheet is a free end, the other end of the elastic sheet is connected to the base band, the protruding part is located on the free end of the elastic sheet, and the protruding part applies pressure on the surface of the circuit board by the deformation elastic force of the elastic sheet.

[0016] Optionally, the number of base bands is two, including a first base band and a second base band, one end of the elastic sheet is connected to the first base band, the other end of the elastic sheet is connected to the second base band, the protruding part is located between the two ends of the elastic sheet, and the protruding part applies pressure on the surface of the circuit board by the deformation elastic force of the elastic sheet.

[0017] Optionally, the pressure is 0.5-50N.

[0018] Optionally, the protruding part also abuts against the inner surface of the insertion hole.

[0019] Optionally, the protruding part abuts against the upper surface or the lower surface of the circuit board.

[0020] Optionally, the plurality of protruding parts abut against the inner surface of the insertion hole and the upper surface of the circuit board at the same time, or the plurality of protruding parts abut against the inner surface of the insertion hole and the lower surface of the circuit board at the same time.

[0021] Optionally, the elastic sheet abutting against the inner surface of the insertion hole and the elastic sheet abutting against the upper surface of the circuit board are arranged at intervals, or the elastic sheet abutting against the inner surface of the insertion hole and the elastic sheet abutting against the lower surface of the circuit board are arranged at intervals.

[0022] Optionally, it further comprises a terminal support fixed on the circuit board, and the insertion terminal is fixed on the terminal support.

[0023] Optionally, the insertion terminal has a first clamping part matched with the first base band and a second clamping part matched with the second base band.

[0024] Optionally, the first clamping part comprises a first flange and a second flange arranged at intervals along the extension direction of the plug-in terminal, the upper edge of the first base strip abuts against the first flange, and the lower edge of the first base strip abuts against the second flange.

[0025] Optionally, the second clamping part comprises a third flange and a fourth flange arranged at intervals along the extension direction of the plug-in terminal, the upper edge of the second base strip abuts against the third flange, and the lower edge of the second base strip abuts against the fourth flange.

[0026] Optionally, the number of elastic sheets is 3-24.

[0027] Optionally, the tangent direction of the elastic sheet is consistent with the axis direction of the metal elastic sheet.

[0028] Optionally, the tangent direction of the elastic sheet forms an angle with the axis of the metal elastic sheet.

[0029] Optionally, the angle between the tangent direction of the elastic sheet and the axis of the metal elastic sheet is equal everywhere.

[0030] Optionally, the angle between the tangent direction of the elastic sheet and the axis of the metal elastic sheet ranges from 10° to 60°.

[0031] Optionally, the metal elastic sheet is made of copper or copper alloy.

[0032] Optionally, the metal elastic sheet is made of tellurium.

[0033] Optionally, the content of tellurium in the metal elastic sheet is 0.1%-5%.

[0034] Optionally, the metal elastic sheet is made of beryllium.

[0035] Optionally, the content of beryllium in the metal elastic sheet is 0.05%-5%.

[0036] Optionally, the content of beryllium in the metal elastic sheet is 0.1%-3.5%.

[0037] Optionally, at least part of the surface of the plug-in terminal and the protruding part are provided with a plating layer.

[0038] Optionally, the plating layer on at least part of the surface of the plug-in terminal is made of a material different from that of the plating layer on the protruding part.

[0039] Optionally, the plating layer is made of one or more of gold, silver, nickel, tin, zinc, tin-lead alloy, silver-antimony alloy, palladium, palladium-nickel alloy, graphite-silver, graphene-silver, and silver-gold-zirconium alloy.

[0040] Optionally, the plating layer comprises a bottom layer and a surface layer.

[0041] Optionally, the bottom layer material contains one or more of gold, silver, nickel, tin, tin-lead alloy and zinc; and the surface layer material contains one or more of gold, silver, nickel, tin, tin-lead alloy, silver-antimony alloy, palladium, palladium-nickel alloy, graphite-silver, graphene-silver and silver-gold-zirconium alloy.

[0042] Optionally, the thickness of the bottom layer is 0.01-15 microns.

[0043] Optionally, the thickness of the bottom layer is 0.1-9 microns.

[0044] Optionally, the thickness of the surface layer is 0.3-55 microns.

[0045] Optionally, the thickness of the surface layer is 0.5-35 microns.

[0046] Optionally, the material of the plug-in terminal contains one of copper or copper alloy or aluminum or aluminum alloy.

[0047] The application also provides a charging base comprising the electrical connection structure of any of the above embodiments.

[0048] The application also provides an automobile comprising the charging base and / or the electrical connection structure of any of the above embodiments.

[0049] The application can bring the following beneficial effects:

[0050] 1. According to the electrical connection structure of the application, the plug-in terminal is in good contact with the metal spring sheet, the metal spring sheet has protruding portions protruding outward, the connection with the circuit board is stable, and the plurality of elastic sheets in the metal spring sheet provides a plurality of signal detection points, ensuring the stability of signal transmission; at the same time, the metal spring sheet has good performance, can be plugged in and out for multiple times, and has a long service life.

[0051] 2. The protruding portions of the metal spring sheet are in arc structure or bending structure, which can further ensure the stability of the connection between the metal spring sheet and the circuit board.

[0052] 3. The diameter of the circumscribed circle of the plurality of protruding portions is greater than the inner diameter of the plug-in hole, which can ensure that the protruding portions stably abut against the upper surface or the lower surface of the circuit board.

[0053] 4. The metal spring according to the present application, the number of base bands can be one, one end of the elastic piece is a free end, the other end of the elastic piece is connected with the first base band, the protruding part is located on the free end of the elastic piece, the protruding part exerts pressure on the surface of the circuit board by the elastic force of the deformation of the elastic piece, thus, the plurality of elastic pieces form an integrated member through one base band, and tightly contact with the plug-in terminal inserted in the annular base band, at the same time, the protruding part is located on the free end of the elastic piece, and can abut against the circuit board by the elastic restoring force of the elastic piece, thereby ensuring the stable connection between the metal spring and the circuit board and the plug-in terminal;

[0054] 5. The metal spring according to the present application, the number of base bands can be two, one end of the elastic piece is connected with the first base band, the other end of the elastic piece is connected with the second base band, the protruding part is located between the two ends of the elastic piece, the protruding part exerts pressure on the surface of the circuit board by the elastic force of the deformation of the elastic piece, thus, the elastic piece is fixed to form an integrated member through the two base bands, and the protruding part exerts pressure on the surface of the circuit board by the elastic restoring force, which greatly facilitates the stability of the connection between the metal spring and the circuit board;

[0055] 6. The metal spring according to the present application, the protruding part can also abut against the inner surface of the plug-in hole of the circuit board; thus, the protruding part abuts against the surface of the circuit board and also abuts against the inner surface of the plug-in hole, which further enhances the stability of the connection between the metal spring and the circuit board, and further ensures the stability of the signal transmission;

[0056] 7. The metal spring according to the present application, the elastic piece abutting against the inner surface of the plug-in hole is arranged separately from the elastic piece abutting against the upper surface of the circuit board, or the elastic piece abutting against the inner surface of the plug-in hole is arranged separately from the elastic piece abutting against the lower surface of the circuit board; since the protruding part is arranged on the free end of the elastic piece, it can be understood that the elastic piece abutting against the inner surface of the plug-in hole is not provided with the protruding part, while the elastic piece abutting against the upper surface or the lower surface of the circuit board is provided with the protruding part, thus, the plurality of elastic pieces on the metal spring are divided into two groups, and the two different elastic pieces are arranged separately, which ensures the stable connection between the metal spring and the circuit board, and also ensures the stable connection between the metal spring and the plug-in terminal, so as to ensure the final electrical connection and signal connection;

[0057] 8. The plug-in terminal according to the present application, the first clamping part and the second clamping part can be arranged, for the embodiment of the metal spring with two base bands, the first clamping part of the plug-in terminal can be clamped with the first base band, and the second clamping part of the plug-in terminal can be clamped with the second base band, thus, the stable connection between the metal spring and the plug-in terminal can be ensured, and the signal connection (the electrical connection includes the electrical energy connection and the signal connection) between the plug-in terminal and the circuit board is further ensured;

[0058] 9. The electric connection structure according to the present application, by setting the angle between the elastic sheet in the metal elastic sheet and the rotation axis of the metal elastic sheet itself, the stability and the conductive performance of the connection between the metal elastic sheet and the plug-in terminal can be further improved;

[0059] 10. The metal elastic sheet and the plug-in terminal of the embodiment of the present application adopt tellurium copper alloy, so that the metal elastic sheet has good conductive performance and easy processing performance, the electrical performance is ensured, and the processing performance is also improved, meanwhile, the elasticity of the tellurium copper alloy is also very good;

[0060] 11. The contact section and the metal elastic sheet of the present application adopt plating layer, which can better increase the corrosion resistance, preferably, a composite plating layer is adopted, which can better improve the firmness of the plating layer, and after multiple plugging and unplugging, the plating layer can still ensure not to fall off and has corrosion resistance. BRIEF DESCRIPTION OF DRAWINGS

[0061] Figure 1 It is a structure schematic view of the electric connection structure according to the first embodiment of the present application;

[0062] Figure 2 It is a structure schematic view of the electric connection structure according to the first embodiment of the present application from another perspective;

[0063] Figure 3 It is a structure schematic view of the metal elastic sheet in the electric connection structure of the first embodiment;

[0064] Figure 4 It is a structure schematic view of the line board in the electric connection structure of the first embodiment, wherein the plug-in hole is shown;

[0065] Figure 5 It is a structure schematic view of the plug-in terminal in the electric connection structure of the first embodiment;

[0066] Figure 6 It is a structure schematic view of the terminal support in the electric connection structure of the first embodiment;

[0067] Figure 7 It is a structure schematic view of the metal elastic sheet in the electric connection structure according to the second embodiment of the present application.

[0068] REFERENCE SIGNS:

[0069] 100 electric connection structure 110 line board

[0070] 120 plug-in terminal 130 terminal support

[0071] 140 / 240 metal elastic sheet 121 plug-in section

[0072] 122 contact section 123 fixed section

[0073] 124 connecting section 131 clamping portion

[0074] 141 / 241 first baseband 142 second baseband

[0075] 143 / 243 elastic sheet 144 / 244 protruding portion

[0076] 145 first clamping portion 146 second clamping portion DETAILED DESCRIPTION

[0077] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0078] The present application will be further described in detail below so that those skilled in the art can implement it according to the description. In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described with reference to the drawings. The terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In the description of the present application, unless otherwise specified, the term "connection" should be understood broadly, for example, it can be fixed connection, detachable connection, direct connection or indirect connection through intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present patent according to the specific circumstances.

[0079] Embodiment one

[0080] The present application provides an electrical connection structure 100 applied to a circuit board 110, the circuit board 110 is provided with a plug hole, as shown in Figure 1 The electrical connection structure 100 includes a metal elastic sheet 140 and a plug-in terminal 120. The metal elastic sheet 140 includes a baseband and a plurality of elastic sheets 143 connected with the baseband, the baseband is wrapped around at least part of the outer periphery of the plug-in terminal 120, the elastic sheet 143 has a protruding portion 144 protruding outward, and the protruding portion 144 abuts against the surface of the circuit board, and the plug-in terminal 120 is electrically connected with the circuit board 110 through the metal elastic sheet 140.

[0081] The plug-in terminal 120 of this invention makes good contact with the metal spring contact 140. The metal spring contact 140 has an outwardly protruding portion 144, which provides a stable connection with the circuit board 110. Multiple elastic pieces 143 provide multiple signal detection points, ensuring the stability of signal transmission. Simultaneously, the metal spring contact 140 itself has good performance, can be repeatedly plugged in and out of the plug-in terminal 120, and has a long service life. This solves the problem in the prior art where poor contact due to unstable soldered pins can affect the stability of the electrical connection between the circuit board 110 or circuit board and the terminal. Furthermore, the plug-in connection between the plug-in terminal 120 and the metal spring contact 140, compared to soldered connections, allows for repeated plugging and unplugging, enhancing the adaptability of the circuit board 110 or circuit board. In this embodiment, the plug-in terminal 120 can also be understood as the connection terminal for the PE line (grounding wire) in the charging device.

[0082] Next, combine Figures 1 to 6 The detailed structure of each component of the electrical connection structure 100 in this embodiment is described in detail.

[0083] Specifically, such as Figure 5 As shown, the plug-in terminal 120 includes a plug-in section 121, a contact section 122, a fixing section 123, and a connecting section 124 connected in sequence. The plug-in section 121 is used to plug into mating terminals, such as the male terminal of a charging gun and the female terminal of a charging socket, allowing charging current to flow from the power source to the car battery. The connecting section 124 is used for electrical connection with cable conductors, such as the plug-in terminal 120 inside the charging socket, connecting to the charging socket cable and conducting electrical energy to the car battery. The contact section 122 is used for contact connection with a metal spring 140, such as the PE terminal of the charging socket contacting the metal spring 140 on the circuit board, enabling the circuit board to read the grounding signal from the PE terminal.

[0084] Specifically, such as Figure 6 As shown, the electrical connection structure of this embodiment also includes a terminal bracket 130, which can be fixed to the circuit board 110. The fixing section 123 of the plug-in terminal 120 is fixed to the terminal bracket 130. In a specific embodiment, the terminal bracket 130 can be fixed to the circuit board 110 by snap-fit, adhesive bonding, and screw connection. Snap-fit ​​refers to providing multiple elastic claws on the terminal bracket 130 and providing slots or buckles on the circuit board 110, so that the multiple claws of the terminal bracket 130 are snapped into the slots or buckles on the circuit board 110, thereby fixing the terminal bracket 130 to the circuit board 110. Adhesive bonding refers to providing adhesive surfaces on both the terminal bracket 130 and the circuit board 110, and then applying adhesive to each to bond the adhesive surfaces together. Screw connection refers to providing threaded holes on the terminal bracket 130 and through holes on the circuit board 110, and screwing the circuit board 110 to the terminal bracket 130 by passing screws through the through holes.

[0085] More specifically, as shown in Figure 6 , the terminal holder can include a clamping portion 131 in the shape of a U, and the fixed segments 123 of the terminals are clamped between the U-shaped clamping portion for fixation.

[0086] In particular, as shown in Figure 1 , Figure 2 and Figure 4 , the circuit board 110 is provided with a plug-in hole 111 for the plug-in terminal 120 to plug into, and the outer diameter of the contact segment 122 of the plug-in terminal 120 is smaller than the diameter of the plug-in hole on the circuit board 110, so that the plug-in terminal 120 can be smoothly inserted into the plug-in hole 111.

[0087] In particular, as shown in Figure 7 , the number of base strips 241 is one, one end of the elastic sheet 243 is a free end, the other end of the elastic sheet 243 is connected to the base strip 241, and the protruding portion 244 is located on the free end of the elastic sheet 243. The protruding portion 244 exerts pressure on the surface of the circuit board 110 by the deformation elastic force of the elastic sheet 243.

[0088] In particular, as shown in Figure 3 , the metal spring 140 includes a first base strip 141 and a second base strip 142. The base strip is in the shape of a ring, and a plurality of elastic sheets 143 are distributed on the ring, further, uniformly distributed on the ring. In this way, the metal spring 140 exerts uniform elastic force on the contact segment 122, and the rotary axis of the plug-in terminal 120 will basically coincide with the axis of the plug-in hole 111, thereby achieving stable electrical connection. Preferably, the number of elastic sheets can be 3-24.

[0089] In particular, one end of the elastic sheet 143 is connected to the first base strip 141, the other end of the elastic sheet 143 is connected to the second base strip 142, and the protruding portion 144 is located between the two ends of the elastic sheet 143. The protruding portion 144 exerts pressure on the surface of the circuit board by the deformation elastic force of the elastic sheet 143.

[0090] More specifically, the two ends of the elastic sheet 143 are fixedly connected by the first base strip 141 and the second base strip 142 to form a one-piece member, and the plurality of elastic sheets 143 have a curved radius, so that the metal spring 140 is in the shape of a waist drum. The outer surface of the waist drum-shaped metal spring can abut against the inner surface of the plug-in hole, achieving stable electrical connection between the metal spring and the circuit board. The protruding portion 144 is located between the two ends of the elastic sheet 143, which is formed by separating one end of part of the plurality of elastic sheets 143 from the base strip and being provided on the free end separated. As shown in Figure 3 , the length of the elastic sheet 143 provided with the protruding portion 144 can be less than the length of the elastic sheet 143 without the protruding portion 144.

[0091] More preferably, the elastic pieces 143 provided with the protrusions 144 are arranged alternately with the elastic pieces 143 not provided with the protrusions 144. As shown in Figure 3 the drawings, the number of the elastic pieces 143 not provided with the protrusions 144 (which can be defined as normal elastic pieces) between the adjacent elastic pieces 143 provided with the protrusions 144 is equal. For example, the number of the normal elastic pieces between the adjacent elastic pieces 143 provided with the protrusions 144 is two. In the present embodiment, as shown in Figure 1 and 2 the protrusions 144 abut against the upper surface of the circuit board 110, thus, it can also be understood that the elastic pieces 143 (the elastic pieces not provided with the protrusions 144) abutting against the inner surface of the insertion hole and the elastic pieces 143 (the elastic pieces provided with the protrusions 144) abutting against the upper surface of the circuit board 110 are arranged alternately.

[0092] Then, in other embodiments, the protrusions 144 can also abut against the lower surface of the circuit board 110, and further, the metal spring 140 can be arranged such that the elastic pieces 143 abutting against the inner surface of the insertion hole and the elastic pieces abutting against the lower surface of the circuit board 110 are arranged alternately.

[0093] Furthermore, in other embodiments not shown, the protrusions can also abut against the inner surface of the insertion hole. Thus, more specifically, a plurality of protrusions can simultaneously abut against the inner surface of the insertion hole and the upper surface of the circuit board, respectively, or a plurality of protrusions can simultaneously abut against the inner surface of the insertion hole and the lower surface of the circuit board, respectively. Thus, the stability of the electrical connection between the metal spring and the circuit board can be further enhanced.

[0094] Of course, the protrusions abutting against the inner surface of the insertion hole and the protrusions abutting against the upper surface of the circuit board can be arranged alternately, or the protrusions abutting against the inner surface of the insertion hole and the protrusions abutting against the lower surface of the circuit board can be arranged alternately.

[0095] Further, the convex portion 144 can have a circular arc structure or a bending structure. The circular arc structure or the bending structure can make the contact between the metal spring and the circuit board more stable. In addition, during use of the electrical connection structure 100, the contact section 122 and the metal spring 140 can have a relative displacement due to vibration. If the contact section 122 and the metal spring 140 are in surface contact in a static state, the metal spring 140 and the circuit board 110 are also in surface contact. In a vibrating environment, the metal spring 140 and the circuit board 110 can have a temporary point contact due to the relative displacement, and at this time, the contact resistance instantaneously increases, and the conduction current also suddenly increases, which can cause the metal spring 140 and the circuit board 110 to be damaged due to an excessively high temperature rise. The circular arc structure or the bending structure can keep the metal spring 140 and the circuit board 110 in surface contact in a vibrating environment, so that the electrical connection structure 100 is not damaged due to a sudden increase in the conduction current.

[0096] Specifically, the bending angle of the bending structure of the convex portion 144 is 90°-160°. In order to verify the influence of the bending angle of the bending structure on the contact resistance between the metal spring and the circuit board 110, the inventors select metal springs 140, plug-in terminals 120 and circuit boards 110 of the same size, and install them in the same relative position, but select different bending angles of the bending structure, and measure the contact resistance between the metal spring 140 and the circuit board 110, respectively. The test results are shown in Table 1.

[0097] The test method of the contact resistance between the metal spring 140 and the circuit board 110 is to use a micro-resistance measuring instrument, one end of the micro-resistance measuring instrument is placed on the metal spring 140, and the other end is placed on the electrical connection point of the circuit board 110. The position is placed the same each time, and then the contact resistance reading on the micro-resistance measuring instrument is read. In this embodiment, the contact resistance greater than 1 mΩ is unqualified.

[0098] Table 1 Influence of different bending angles of the bending structure on the contact resistance between the contact portion and the contact section 122

[0099]

[0100] As can be seen from Table 1 above, when the bending angle of the bending structure is less than 90°, the contact position of the bending mechanism is relatively sharp due to the small angle, and the contact area with the circuit board is small, and the contact resistance also increases, which does not meet the standard requirements. When the bending angle of the bending structure is greater than 160°, the bending mechanism approaches a plane, which can cause the metal spring 140 to be unable to be installed into the predetermined plug-in position of the circuit board 110, so that the electrical connection structure 100 cannot function. Therefore, the inventors set the bending angle of the convex portion to 90°-160°.

[0101] Preferably, the diameter of the circumscribed circle of the plurality of protrusions 144 is greater than the inner diameter of the insertion hole 111. In this way, the protrusions 144 can be made to abut the circuit board 110 more conveniently. The present application does not limit the specific shape of the protrusions.

[0102] Further, when the contact section 122 of the insertion terminal 120 is in contact connection with the metal spring 140, the plurality of elastic pieces 143 of the metal spring 140 are elastically deformed, and the elastic pieces 143 further exert pressure on the inner wall of the insertion hole 111 and the protrusions 114 and on the circuit board 110, thereby realizing stable electrical connection between the insertion terminal 120 and the metal spring 140 and the circuit board 110 through the plurality of elastic pieces 143 and the plurality of protrusions 144.

[0103] Further, the pressure exerted by the protrusions 144 on the circuit board 110 can be 0.5 N-50 N. In order to verify the effect of the pressure exerted by the protrusions 144 on the circuit board 110 on the contact resistance between the metal spring 140 and the circuit board 110, the inventors selected metal springs 140, insertion terminals 120 and circuit boards 110 of the same size, installed them in the same relative position, but selected different elastic forces of the elastic pieces 143, and measured the contact resistance between the protrusions 144 and the circuit board 110, respectively. The test results are shown in Table 2.

[0104] The elastic force of the elastic piece 143 was measured by fixing the metal spring 140 with a precision push-pull force gauge, and measuring the elastic force after the elastic piece 143 moved to the working displacement.

[0105] The test method for the contact resistance of the protrusions 144 and the electrical connection point on the circuit board 110 is to use a micro-resistance measuring instrument, place one end of the micro-resistance measuring instrument on the protrusions 144 and the other end on the electrical connection point, measure the same position each time, and then read the contact resistance reading on the micro-resistance measuring instrument. In this embodiment, a contact resistance greater than 1 mΩ is unqualified.

[0106] Table 2 Effect of different pressures on the contact resistance between the contact section 122 and the contact section 122

[0107]

[0108] As can be seen from Table 2 above, when the pressure applied by the protrusion 144 to the circuit board 110 is less than 0.5N, the contact area between the protrusion 144 and the circuit board 110 is small due to the low pressure, resulting in increased contact resistance, which does not meet the standard requirements. However, when the pressure applied by the protrusion 144 to the circuit board 110 is greater than 50N, the elastic sheet 143 has excessive elasticity and hardly deforms, which may prevent the elastic sheet 143 with the protrusion 144 from being inserted into the predetermined position of the insertion hole 111, thus rendering the electrical connection structure 100 unable to function. Therefore, the inventors set the pressure applied by the protrusion 144 to the circuit board 110 to be between 0.5N and 50N.

[0109] In addition, in this embodiment, reference Figure 3 The tangential direction of the elastic sheet 143 is consistent with the axial direction of the metal spring sheet 140. Here, the tangential direction is defined as the direction in which the sheet portion of the elastic sheet 143 extends. Although the elastic sheet 143 is radially outwardly bent, the direction in which the elastic sheet 143 itself extends is basically consistent with the direction of the rotation axis of the baseband.

[0110] It is understandable that in other embodiments, the tangential direction of the elastic sheet 143 may form a certain angle with the axis of the metal spring sheet 140. Figure 3 Viewed from this angle, the elastic sheet 143 is tilted to the left or right. Preferably, the angle between the tangent direction of the elastic sheet 143 and the axis of the metal spring 140 ranges from 10° to 60°. More preferably, the angle between the tangent direction of the elastic sheet 143 and the axis of the metal spring 140 is equal everywhere. This can be understood as the elastic sheet 143 always extending in the same direction.

[0111] Next, the mating relationship between the plug terminal 120 and the metal spring 140 will be explained. In this embodiment, the contact portion of the plug terminal 120 is provided with a first engaging portion 145 and a second engaging portion 146 arranged at intervals. In this embodiment, the first engaging portion 145 and the second engaging portion 146 are annular ribs, and the outermost diameter of the first engaging portion 145 and the second engaging portion 146 is larger than the diameter of the first base strip 141 and the second base strip 142. Since the metal spring 140 is elastic, after the plug terminal 120 and the metal spring 140 are plugged into place, the first annular rib is held on the first base strip 141 of the metal spring 140, and the second base strip 142 is held on the second annular rib, thereby achieving a stable electrical connection between the plug terminal 120 and the metal spring 140.

[0112] Of course, further, in an embodiment not shown, the plug-in terminal can have a first flange and a second flange spaced apart along the extension direction of the plug-in terminal, the first flange and the second flange forming the first clamping portion; the outermost diameter of the first flange and the second flange is greater than the diameter of the first base strip. After the plug-in terminal and the metal spring are assembled in place, the upper edge of the first base strip abuts against the first flange, and the lower edge of the first base strip abuts against the second flange. It can be understood that both ends of the first base strip are subjected to the clamping force.

[0113] Similarly, the second clamping portion can include a third flange and a fourth flange spaced apart along the extension direction of the plug-in terminal, the third flange and the fourth flange forming the second clamping portion; the outermost diameter of the third flange and the fourth flange is greater than the diameter of the second base strip. After the plug-in terminal and the metal spring are assembled in place, the upper edge of the second base strip abuts against the third flange, and the lower edge of the second base strip abuts against the fourth flange. It can be understood that both ends of the second base strip are subjected to the clamping force.

[0114] Thus, the electrical connection between the plug-in terminal and the metal spring is more stable.

[0115] In some embodiments, the material of the metal spring 140 is copper or copper alloy. Copper has good conductivity and ductility, and excellent elasticity, which is preferred as a conductor material.

[0116] Further, the material of the metal spring 140 contains tellurium. The material of the metal spring 140 is tellurium copper alloy, which makes the terminal have good electrical conductivity and easy processing performance, ensures the electrical performance and improves the processing performance. At the same time, the elasticity of the tellurium copper alloy is also very good. Preferably, the content of tellurium in the material of the metal spring 140 is 0.1%-5%.

[0117] The inventors selected 10 metal springs 140 of the same shape for testing. Each metal spring 140 is a tellurium copper alloy, and the content of tellurium is 0.05%, 0.1%, 0.2%, 1%, 1.2%, 1.8%, 3%, 5%, 6%, and 7%, respectively. The test content is the metal spring 140 and the resistance, and the test results are shown in Table 3.

[0118] The elastic force of the elastic sheet 143 is measured by fixing the metal spring 140 with a precision push-pull force gauge. In this embodiment, the elastic force is less than 20N, which is unqualified.

[0119] The test method of the resistance of the metal spring 140 is to use a micro-resistance measuring instrument. The measuring end of the micro-resistance measuring instrument is placed on both ends of the metal spring 140. The same position is placed each time, and then the resistance reading on the micro-resistance measuring instrument is read. In this embodiment, the resistance is greater than 1mΩ, which is unqualified.

[0120] Table 3: Effect of different content of tellurium on the elasticity and resistance of the metal spring 140

[0121]

[0122] As can be seen from Table 3 above, when the content of tellurium in the material of the metal spring 140 is less than 0.1%, the material is close to pure copper, and the relative material is soft, so the elasticity of the elastic sheet 143 does not meet the required value. When the content of tellurium in the material of the metal spring 140 is greater than 5%, the conductivity of the tellurium-copper alloy is poorer than that of pure copper, resulting in a resistance value of the metal spring 140 that does not meet the requirements. Therefore, the content of tellurium in the material of the metal spring 140 is 0.1%-5%.

[0123] Further, the material of the metal spring 140 contains beryllium. The material of the metal spring 140 is beryllium-copper alloy, which makes the terminal have very high hardness, elastic limit, fatigue limit and wear resistance, also has good corrosion resistance, thermal conductivity and electrical conductivity, and does not produce sparks when impacted. Preferably, the content of beryllium in the material of the metal spring 140 is 0.05%-5%. The limitation of the content of beryllium in the metal spring 140 is obtained by the inventors through many tests.

[0124] When the content of beryllium in the material of the metal spring 140 is less than 0.05%, the material is close to pure copper, and sparks are easily produced when impacted. When the content of beryllium in the material of the metal spring 140 is greater than 5%, the conductivity of the beryllium-copper alloy is poorer than that of pure copper, resulting in a resistance value of the metal spring 140 that does not meet the requirements. Therefore, the content of beryllium in the material of the metal spring 140 is 0.05%-5%. More preferably, the content of beryllium in the material of the metal spring 140 is 0.1%-3.5%.

[0125] In order to verify the effect of the content of beryllium in the material of the metal spring 140 on the resistance and sparking of the metal spring 140, the inventors selected 10 metal springs 140 of the same shape for testing, each of which was a beryllium-copper alloy, and the content of beryllium was 0.03%, 0.05%, 0.1%, 0.2%, 1%, 1.2%, 1.8%, 3%, 5% and 6%, respectively. The test contents were the resistance and sparking of the metal spring 140, and the test results are shown in Table 4.

[0126] The test method for the resistance of the metal spring 140 is to use a micro-resistance measuring instrument, place the measuring ends of the micro-resistance measuring instrument on both ends of the metal spring 140, place the same position each time, and then read the resistance reading on the micro-resistance measuring instrument. In this embodiment, the resistance greater than 1 mΩ is unqualified.

[0127] The firing condition of the metal spring 140 is that the charged plug-in terminal 120 collides with the metal spring 140, simulating the working condition of the plug-in terminal 120 and the metal spring 140. After 1000 collisions, the number of times of firing is observed. If the number of times of firing is more than 3, it is unqualified.

[0128] Table 4 Influence of different content of beryllium on the resistance and firing condition of the metal spring 140

[0129]

[0130] As can be seen from Table 4, when the content of beryllium in the metal spring 140 is less than 0.05%, the material is close to pure copper, and when the plug-in terminal 120 collides with the metal spring 140, the number of times of firing is more than 3. When the content of beryllium in the metal spring 140 is more than 5%, the conductivity of beryllium copper alloy is worse than that of pure copper material, which leads to the resistance of the metal spring 140 not meeting the requirements. Therefore, the content of beryllium in the metal spring 140 is 0.05%-5%. Preferably, when the content of beryllium in the metal spring 140 is 0.1%-3.5%, the resistance and firing condition of the metal spring 140 are in a more optimal range, so the inventors set the content of beryllium in the metal spring 140 to be preferably 0.1%-3.5%.

[0131] From the above description of the material of the metal spring 140, it can be understood that the material of the plug-in terminal 120 can also have the same structure as the material of the metal spring 140. In some embodiments, the material of the plug-in terminal can contain copper or copper alloy or aluminum or aluminum alloy. For the sake of brevity, the details are not repeated here.

[0132] It can be understood that in some embodiments, the material of the plug-in terminal 120 is copper or copper alloy or aluminum or aluminum alloy.

[0133] In some embodiments, a plating layer is provided on at least part of the surface and the protruding portion of the plug-in terminal. Specifically, the contact section 122 of the plug-in terminal 120 and the metal spring 140 are provided with a plating layer. Preferably, the material of the plating layer on the contact section 122 of the plug-in terminal 120 is different from the material of the plating layer on the protruding portion 144 of the metal spring 140.

[0134] The plating layer is used to improve corrosion resistance, improve electrical conductivity, increase the number of plug-in times, and better prolong the service life of the plug-in terminal 120 and the metal spring 140.

[0135] The plating layer can be obtained by electroplating, chemical plating, magnetron sputtering or vacuum plating. The thickness of the plating layer of the metal spring 140 and the plug-in terminal 120 can be consistent, or different thicknesses of the plating layer can be set according to needs.

[0136] Electroplating is a process of depositing a thin layer of metal or alloy on the surface of another metal by electrolysis.

[0137] Chemical plating is a process of depositing a metal by a controllable oxidation-reduction reaction under the catalytic action of the metal.

[0138] Magnetron sputtering is a process of depositing a thin layer of metal or alloy on the surface of another metal by electrolysis.

[0139] Vacuum plating is a process of depositing a thin layer of metal or alloy on the surface of another metal by electrolysis.

[0140] The plating layer material can contain one or more of gold, silver, nickel, tin, zinc, tin-lead alloy, silver-antimony alloy, palladium, palladium-nickel alloy, graphite-silver, graphene-silver, and silver-gold-zirconium alloy. The plating layer material is a conventional material. Copper is a reactive metal that will oxidize with oxygen and water during use, so it needs to be plated with one or more non-reactive metals to extend the service life of the metal spring 140 and the plug-in terminal 120. In addition, for metal contacts that need to be frequently plugged and unplugged, a good wear-resistant metal is also needed as a plating layer to greatly increase the service life of the contacts. In addition, the contacts need to have good electrical conductivity, and the electrical conductivity and stability of the above-mentioned metals are better than copper or copper alloy, which can make the metal spring 140 and the plug-in terminal 120 have better electrical properties and longer service life.

[0141] In order to demonstrate the effect of different plating layer materials on the overall performance of the metal spring 140 and the plug-in terminal 120, the inventors used metal springs 140 and plug-in terminals 120 of the same size and material with different plating layer materials to conduct a series of corrosion resistance time tests, and the experimental results are shown in Table 5 below.

[0142] The corrosion resistance time test in Table 4 is to place the metal spring 140 and the plug-in terminal 120 into a salt spray test chamber, spray salt mist on each position of the metal spring 140 and the plug-in terminal 120, take out and clean every 20 hours to observe the surface corrosion, which is one cycle, until the surface corrosion area of the metal spring 140 and the plug-in terminal 120 is greater than 10% of the total area, stop testing, and record the cycle number at that time. In this embodiment, a cycle number less than 80 is considered unqualified.

[0143] Table 5 Effect of different plating layer materials on the corrosion resistance of the metal spring 140 and the plug-in terminal 120

[0144]

[0145] From Table 5, it can be seen that when the plating layer material contains gold, silver, silver-antimony alloy, palladium, palladium-nickel alloy, graphite-silver, graphite-silver and silver-gold-zirconium alloy, the experimental results exceed the standard value more, and the performance is relatively stable. When the plating layer material contains nickel, tin, tin-lead alloy, zinc, the experimental results can also meet the requirements, therefore, the inventors select one or more combinations of gold, silver, nickel, tin, tin-lead alloy, zinc, silver-antimony alloy, palladium, palladium-nickel alloy, graphite-silver, graphite-silver and silver-gold-zirconium alloy.

[0146] Further, the plating layer can include a bottom layer and a surface layer. In some embodiments, the plating layer adopts a multi-layer plating method. After the processing of the plug-in terminal 120 and the metal spring 140, there are still many gaps and holes under the actual surface micro interface. These gaps and holes are the main cause of wear and corrosion of the metal spring 140 and the plug-in terminal 120 during use, so a bottom layer needs to be plated on the surface of the metal spring 140 and the plug-in terminal 120 to fill the surface gaps and holes, so that the surface is smooth and free of holes. Then a surface layer is plated, which will be more firmly combined and more smooth. The plating layer surface is free of gaps and holes, so that the wear resistance, corrosion resistance and electrical performance of the metal spring 140 and the plug-in terminal 120 are more excellent, greatly prolonging the service life of the metal spring 140 and the plug-in terminal 120.

[0147] The bottom layer material can contain one or more of gold, silver, nickel, tin, tin-lead alloy and zinc; and the surface layer material can contain one or more of gold, silver, nickel, tin, tin-lead alloy, silver-antimony alloy, palladium, palladium-nickel alloy, graphite-silver, graphite-silver and silver-gold-zirconium alloy. The bottom layer material is a current material, and the surface layer material is also a current material.

[0148] In a specific embodiment, the thickness of the bottom layer is 0.01-15 μm. Preferably, the thickness of the bottom layer is 0.1-9 μm.

[0149] In a specific embodiment, the thickness of the surface layer is 0.3-55 μm. Preferably, the thickness of the surface layer is 0.5-35 μm.

[0150] In order to demonstrate the influence of the thickness of the bottom layer plating on the overall performance of the metal spring 140 and the plug-in terminal 120, the inventors use metal spring 140 and plug-in terminal 120 samples of the same specification and material, with different nickel plating bottom layer thicknesses and the same silver plating surface layer thickness, to conduct a series of temperature rise and corrosion resistance time tests, and the experimental results are shown in Table 6.

[0151] The temperature rise test in Table 6 below is to pass the same current through the metal spring 140 and the connector terminal 120 after contact, detect the temperature of the same position of the metal spring 140 and the connector terminal 120 before power-on and after temperature stabilization in a closed environment, and take the absolute value of the difference. In this embodiment, a temperature rise greater than 50K is considered unqualified.

[0152] The corrosion resistance time test in Table 6 below is to place the metal spring 140 and the connector terminal 120 into a salt spray test chamber, spray salt mist on each position of the metal spring 140 and the connector terminal 120, take out and clean every 20 hours to observe the surface corrosion, which is one cycle, until the surface corrosion area of the metal spring 140 and the connector terminal 120 is greater than 10% of the total area, stop the test, and record the cycle number at that time. In this embodiment, a cycle number less than 80 is considered unqualified.

[0153] Table 6 Influence of different thicknesses of the bottom layer plating on the temperature rise and corrosion resistance of the metal spring 140 and the connector terminal 120

[0154]

[0155] As can be seen from Table 6 above, when the thickness of the bottom layer nickel plating is less than 0.01 μm, the temperature rise of the metal spring 140 and the connector terminal 120 is qualified, but the corrosion resistance cycle number of the metal spring 140 and the connector terminal 120 is less than 80, which does not meet the performance requirements of the metal spring 140 and the connector terminal 120. It has a great influence on the overall performance and service life of the electrical connection structure 100, and in severe cases, it can cause the service life of the product to decrease rapidly or even fail, leading to a combustion accident. When the thickness of the bottom layer nickel plating is greater than 15 μm, the heat generated by the metal spring 140 and the connector terminal 120 cannot be dissipated due to the thick bottom layer plating, resulting in unqualified temperature rise of the metal spring 140 and the connector terminal 120, and the thick plating is prone to fall off from the surface of the metal spring 140 and the connector terminal 120, causing the corrosion resistance cycle number to decrease. Therefore, the inventors choose the thickness of the bottom layer plating to be 0.01 μm-15 μm. Preferably, the inventors find that when the thickness of the bottom layer plating is 0.1 μm-9 μm, the metal spring 140 and the connector terminal 120 have better comprehensive effects on temperature rise and corrosion resistance, and therefore, in order to further improve the safety, reliability and practicability of the product itself, the thickness of the bottom layer plating is preferably 0.1 μm-9 μm.

[0156] In order to demonstrate the influence of the thickness of the surface layer plating on the overall performance of the connector terminal, the inventors use metal spring 140 and connector terminal 120 samples of the same specification and material, with the same thickness of the nickel-plated bottom layer and different thicknesses of the silver-plated surface layer, to conduct a series of temperature rise and corrosion resistance time tests, and the experimental results are shown in Table 7 below.

[0157] Table 7 Influence of different surface plating thickness on temperature rise and corrosion resistance of metal spring 140 and plug-in terminal 120

[0158]

[0159]

[0160] From the above table 7, when the surface silver plating layer thickness is less than 0.3 μm, the temperature rise of the metal spring 140 and the plug-in terminal 120 is qualified, but due to the plating layer is too thin, the corrosion resistance period of the metal spring 140 and the plug-in terminal 120 is less than 80, which does not meet the performance requirements of the metal spring 140 and the plug-in terminal 120. It has a great influence on the overall performance and life of the electrical connection structure 100, and in severe cases, it can cause the product life to decrease rapidly or even fail, leading to a combustion accident. When the surface silver plating layer thickness is greater than 55 μm, due to the thick bottom layer, the heat generated by the metal spring 140 and the plug-in terminal 120 cannot be dissipated, resulting in unqualified temperature rise of the metal spring 140 and the plug-in terminal 120, and the thick plating layer is prone to fall off from the surface of the terminal, resulting in a decrease in the corrosion resistance period. And because the surface plating layer metal is expensive, using a thicker plating layer does not improve performance, and there is no use value. Therefore, the inventors choose the surface silver plating layer thickness to be 0.3 μm-55 μm.

[0161] Preferably, the inventors found that when the surface plating layer thickness is 0.5 μm-35 μm, the temperature rise and corrosion resistance of the metal spring 140 and the plug-in terminal 120 are better, therefore, in order to further improve the safety, reliability and practicability of the product itself, the surface plating layer thickness is preferably 0.5 μm-35 μm.

[0162] In a specific embodiment, the material of the plug-in terminal 120 contains one of copper or copper alloy or aluminum or aluminum alloy. The plug-in terminal 120 of the electric vehicle needs to use a plug-in terminal 120 with a large cross-sectional area for current conduction due to high voltage and large current. Copper material has good electrical conductivity and ductility, and is preferred as the material of the plug-in terminal 120. However, with the rising price of copper, the cost of using copper material as the material of the plug-in terminal 120 will be higher and higher. Therefore, people began to look for substitutes for metal copper to reduce costs. The content of metal aluminum in the earth's crust is about 7.73%, and after optimization of the refining technology, the price is relatively low, and compared with copper, aluminum is lighter in weight and has only second to copper in electrical conductivity. Therefore, in the field of automobile electrical connection, aluminum can replace part of copper. Therefore, it is a development trend to replace copper with aluminum in the field of automobile electrical connection.

[0163] According to the electric connection structure 100 of the embodiment, the plug-in terminal 120 is in good contact with the metal spring 140, the connection between the metal spring 140 and the circuit board 110 is stable, and the plurality of elastic pieces 143 provide a plurality of signal detection points, ensuring the stability of signal transmission; meanwhile, the metal spring 140 itself has good performance, can be used for multiple plug-in and plug-out of the plug-in terminal 120, and has a long service life.

[0164] Second embodiment

[0165] The electric connection structure according to the second embodiment will be described below. Figure 7 The plug-in terminal, the circuit board terminal support have the same structure and configuration as those described in the first embodiment except the metal spring 240. Therefore, the elements having substantially the same functions as those in the first embodiment are denoted by the same reference numerals. And for the sake of brevity, the other components having the same structure / configuration are not described and / or shown in detail here.

[0166] As shown in Figure 7 The metal spring 240 includes a first base band 241 and a plurality of elastic pieces 243. One end of the elastic piece 243 is a free end, the other end of the elastic piece 243 is connected with the first base band 241, and the protruding part 244 is located on the free end of the elastic piece 243, and the protruding part 244 exerts pressure on the surface of the circuit board 110 by the deformation elastic force of the elastic piece 243. Thus, on the basis of meeting stable connection, the manufacturing cost of the metal spring can be saved.

[0167] According to the electric connection structure of the embodiment, the plug-in terminal is in good contact with the metal spring, the metal spring has a protruding part protruding outward, the connection with the circuit board is stable, and the plurality of elastic pieces in the metal spring provide a plurality of signal detection points, ensuring the stability of signal transmission; meanwhile, the metal spring itself has good performance, can be used for multiple plug-in and plug-out of the plug-in terminal, and has a long service life.

[0168] The present application also provides a charging base, which can contain the electric connection structure of any of the above embodiments. The electric connection structure 100 of the present application contains the plug-in terminal 120 in good contact with the metal spring 140, the connection between the metal spring 140 and the circuit board 110 is stable, and the plurality of elastic pieces 143 provide a plurality of signal detection points, ensuring the stability of signal transmission; meanwhile, the metal spring 140 itself has good performance, can be used for multiple plug-in and plug-out of the plug-in terminal 120, and has a long service life.

[0169] Third embodiment

[0170] The application also provides an automobile, which can comprise the charging base and / or the electric connection structure of any of the above embodiments. In the prior art, the plug-in terminal 120 is usually directly welded on the circuit board 110, and if the plug-in terminal 120 is damaged during use, the plug-in terminal 120 is not easy to remove during maintenance, which increases the maintenance man-hours and maintenance costs. If the plug-in terminal 120 is not firmly welded, the plug-in terminal 120 and the circuit board 110 can not be in good contact, which further affects the stability of the electrical connection between the circuit board 110 and the plug-in terminal 120. This can cause the equipment to leak electricity, and there is a risk of electric shock injury. The automobile provided by the application adopts the charging base and / or the electric connection structure of any of the above embodiments, the circuit board 110 and the plug-in terminal 120 are connected by the metal spring 140, the plug-in terminal 120 can be removed from the circuit board 110 at any time, which saves maintenance man-hours and reduces maintenance costs. In addition, the elastic force of the metal spring 140 is stable, and the contact resistance between the metal spring 140 and the plug-in terminal 120 is always stable. In the moving state of the automobile, the metal spring 140 can maintain stable electrical connection with the plug-in terminal 120 in the constant vibration state of the plug-in terminal 120, which ensures the safety of the automobile and prolongs the service life of the automobile.

[0171] Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. As used herein, the term "if' can be construed to mean "when" or "upon" or "in response to the occurrence of" in addition to "in response to the fulfillment or lapse of" unless otherwise indicated by context.

[0172] The application has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the application to the described embodiments. Those skilled in the art can understand that more variations and modifications can be made according to the teachings of the application, and these variations and modifications all fall within the scope of the application claimed.

Claims

1. An electrical connection structure applied to a circuit board, the circuit board being provided with a connector hole, characterized in that, The electric connection structure comprises: a metal spring and a plug-in terminal; The metal spring comprises a base band and a plurality of elastic pieces connected to the base band, the base band is wrapped around at least part of the outer periphery of the plug-in terminal, the base band is two in number, comprising a first base band and a second base band, one end of the elastic piece is connected to the first base band, the other end of the elastic piece is connected to the second base band, the outer surface of the elastic piece abuts against the inner surface of the plug-in hole, the elastic piece has a protruding portion protruding outward, the protruding portion is located between the two ends of the elastic piece, the one end of part of the elastic pieces is separated from the corresponding first base band or second base band to form a free end, the protruding portion is arranged on the separated free end, the protruding portion exerts pressure on the surface of the circuit board by the deformation elastic force of the elastic piece to abut against the surface of the circuit board and electrically connect the circuit board, and the plug-in terminal is electrically connected to the circuit board through the metal spring.

2. The electrical connection structure according to claim 1, characterized by The base band is in a ring structure, and the elastic pieces are distributed on the ring structure.

3. The electrical connection structure according to claim 2, characterized in that The elastic pieces are uniformly distributed on the ring structure.

4. The electrical connection structure according to claim 1, characterized by The protruding portion is in a circular arc structure or a bending structure.

5. The electrical connection structure according to claim 4, characterized in that The bending angle of the bending structure is 90°-160°.

6. The electrical connection structure according to claim 1, characterized by The diameter of the circumscribed circle of the plurality of protruding portions is greater than the inner diameter of the plug-in hole.

7. The electrical connection structure according to claim 1, characterized by The pressure is 0.5N-50N.

8. The electrical connection structure according to claim 1, characterized by The protruding portion also abuts against the inner surface of the plug-in hole.

9. The electrical connection structure according to claim 1, characterized by The protruding portion abuts against the upper surface or the lower surface of the circuit board.

10. The electrical connection structure according to claim 8 or 9, characterized in that, The plurality of protruding portions simultaneously abut against the inner surface of the plug-in hole and the upper surface of the circuit board, or the plurality of protruding portions simultaneously abut against the inner surface of the plug-in hole and the lower surface of the circuit board.

11. The electrical connection structure according to claim 1, characterized by The elastic pieces abutting against the inner surface of the plug-in hole and the elastic pieces abutting against the upper surface of the circuit board are arranged at intervals, or the elastic pieces abutting against the inner surface of the plug-in hole and the elastic pieces abutting against the lower surface of the circuit board are arranged at intervals.

12. The electrical connection structure according to claim 1, characterized by A terminal support is further included, the terminal support is fixed on the circuit board, and the plug-in terminal is fixed on the terminal support.

13. The electrical connection structure according to claim 1, characterized by The plug-in terminal has a first clamping portion matched with the first base band and a second clamping portion matched with the second base band.

14. The electrical connection structure according to claim 13, characterized by The first clamping portion comprises a first flange and a second flange arranged at intervals along the extension direction of the plug-in terminal, the upper edge of the first base band abuts against the first flange, and the lower edge of the first base band abuts against the second flange.

15. The electrical connection structure according to claim 13, wherein The second clamping portion comprises a third flange and a fourth flange arranged at intervals along the extension direction of the plug-in terminal, the upper edge of the second base band abuts against the third flange, and the lower edge of the second base band abuts against the fourth flange.

16. The electrical connection structure according to claim 1, characterized by The number of elastic pieces is 3-24.

17. The electrical connection structure according to claim 1, characterized by The tangent direction of the elastic piece is consistent with the axis direction of the metal spring.

18. The electrical connection structure according to claim 1, characterized by The tangent direction of the elastic piece is at a certain angle with the axis of the metal spring.

19. The electrical connection structure according to claim 1, characterized by The tangent direction of the elastic piece is equal to the angle of the axis of the metal spring.

20. The electrical connection structure according to claim 1, characterized by The tangent direction of the elastic piece is in the range of 10°-60° with the axis of the metal spring.

21. The electrical connection structure according to claim 1, characterized by The metal spring contains copper or copper alloy.

22. The electrical connection structure according to claim 21, wherein The metal spring contains tellurium.

23. The electrical connection structure according to claim 22, wherein The content of tellurium in the metal spring is 0.1%-5%.

24. The electrical connection structure according to claim 21, wherein The metal spring contains beryllium.

25. The electrical connection structure according to claim 24, wherein The content of beryllium in the metal spring is 0.05%-5%.

26. The electrical connection structure according to claim 24, wherein The content of beryllium in the metal spring is 0.1%-3.5%.

27. The electrical connection structure according to claim 1, characterized by The at least part of the surface of the plug-in terminal and the protrusion are provided with a plating layer.

28. The electrical connection structure of claim 27, wherein The plating layer on the at least part of the surface of the plug-in terminal is different from the plating layer on the protrusion.

29. The electrical connection structure of claim 27, wherein The plating layer contains one or more of gold, silver, nickel, tin, zinc, tin-lead alloy, silver-antimony alloy, palladium, palladium-nickel alloy, graphite-silver, graphene-silver and silver-gold-zirconium alloy.

30. The electrical connection structure of claim 27, wherein The plating layer comprises a bottom layer and a surface layer.

31. The electrical connection structure of claim 30, wherein The bottom layer contains one or more of gold, silver, nickel, tin, tin-lead alloy and zinc; the surface layer contains one or more of gold, silver, nickel, tin, tin-lead alloy, silver-antimony alloy, palladium, palladium-nickel alloy, graphite-silver, graphene-silver and silver-gold-zirconium alloy.

32. The electrical connection structure of claim 30, wherein The thickness of the bottom layer is 0.01-15μm.

33. The electrical connection structure of claim 30, wherein The thickness of the bottom layer is 0.1-9μm.

34. The electrical connection structure of claim 30, wherein The thickness of the surface layer is 0.3-55μm.

35. The electrical connection structure of claim 30, wherein, The thickness of the surface layer is 0.5-35μm.

36. The electrical connection structure according to claim 1, wherein The plug-in terminal contains one of copper or copper alloy or aluminum or aluminum alloy.

37. A charging station, comprising: The charging base comprises the electric connection structure of any one of claims 1-36.

38. An automobile characterized by comprising: The automobile comprises the charging base of claim 37 and / or comprises the electric connection structure of any one of claims 1-36.

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