Terminal and electric connection device

Abstract

The utility model discloses a terminal and an electrical connection device, which are used for being plugged with a plug-in terminal, the electrical connection device comprises a terminal main body and at least two conductive rings, the terminal main body comprises a plug-in part, a fixing part and a wiring part which are connected in sequence, at least the plug-in part is provided with a plug-in cavity, and the plug-in cavity is communicated with the fixing part. At least two annular grooves which are axially arranged at intervals are formed in the inner wall of the insertion cavity, each conductive ring is arranged in the corresponding annular groove, at least part of each conductive ring is exposed out of the corresponding annular groove, the outer diameter of each conductive ring abuts against the bottom wall of the corresponding annular groove, and the outer diameter of each conductive ring abuts against the bottom wall of the corresponding annular groove. The inner diameter of each conductive ring abuts against the outer wall of the plug-in terminal and is in interference fit with the outer wall of the plug-in terminal, and the terminal body is electrically connected with the plug-in terminal through the conductive rings. The electric conductivity of the beryllium copper conductive ring is higher than that of a traditional beryllium copper conductive ring.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, and more specifically, to a terminal and an electrical connection device. Background Art

[0002] With the rapid development of new energy electric vehicles, the usage of terminals for electrical connection is increasing. The terminals used in charging guns and charging seats mainly transmit electrical signals or conduct electricity. The terminals need to be plugged into mating terminals to achieve electrical connection. During the repeated plugging and unplugging process between the terminals and the mating terminals, there is wear, which not only affects the charging effect but also the stability of electrical connection. Traditional terminals generally only install a drum spring in the plugging cavity and achieve electrical connection with the mating terminal through the drum spring. The drum spring is used to increase the stability of electrical connection. However, the drum spring is not easy to install in the plugging cavity, and after being damaged, the terminal and the mating terminal cannot be electrically connected. The drum spring is not easy to replace, and the cost is relatively high.

[0003] Therefore, there is an urgent need for a new solution in the prior art to solve the above problems. Summary of the Utility Model

[0004] An object of the utility model is to provide a new technical solution for a terminal and an electrical connection device to solve the problems that traditional terminals are prone to wear during the repeated plugging and unplugging process with mating terminals, which affects the charging effect and connection stability, and for terminals with only a drum spring added, the drum spring is not easy to install, affects electrical connectivity after being damaged, is not easy to replace, and has a high cost.

[0005] According to the utility model, a terminal for plugging into a mating terminal is provided, which includes a terminal body and at least two conductive rings. The terminal body includes a plugging portion, a fixing portion, and a wiring portion connected in sequence. At least the plugging portion has a plugging cavity. At least two axially spaced annular grooves are formed on the inner wall of the plugging cavity. Each conductive ring is disposed in a corresponding annular groove and at least part of it is exposed outside the annular groove. The outer diameter of each conductive ring abuts against the bottom wall of the annular groove, and the inner diameter of each conductive ring abuts against the outer wall of the mating terminal and is in interference fit. The terminal body is electrically connected to the mating terminal through the conductive ring.

[0006] Optionally, the free end of the plugging portion bends towards the plugging cavity to form a blocking portion. The minimum inner diameter of the blocking portion is smaller than the outer diameter of the conductive ring and smaller than the inner diameter of the conductive ring. The blocking portion is used to prevent the conductive ring from axially disengaging from the plugging cavity.

[0007] Optionally, the axial width of the annular groove is greater than the outer diameter of the conductive ring.

[0008] Optionally, at least one annular drum spring is further provided within the annular groove in the insertion cavity, and the minimum inner diameter of the annular drum spring is less than or equal to the inner diameter of the conductive ring.

[0009] Optionally, a raised retaining ring is provided inside the insertion cavity, and the retaining ring is located on both sides of the annular drum spring to limit the annular drum spring.

[0010] Optionally, the outer wall of the fixing portion is provided with a sealing groove and a clamping groove which are arranged at intervals.

[0011] Optionally, a sealing ring is provided in the sealing groove, and the sealing ring is in interference fit with the sealing groove.

[0012] Optionally, the conductive ring and the sealing ring are made of conductive silicone rubber.

[0013] Optionally, a coating is provided at least on the bottom wall of the annular groove and the area in contact with the outer diameter of the conductive ring.

[0014] Optionally, the axial width of the sealing groove is less than the diameter of the sealing ring, and the radial depth of the sealing groove is less than the diameter of the sealing ring.

[0015] The present utility model further provides an electrical connection device, including a circuit board, an installation hole is provided on the circuit board, the terminal is installed in the installation hole, and is electrically connected to the circuit board through the sealing ring.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. In the present utility model, at least two annular grooves arranged axially at intervals are provided on the inner wall of the insertion cavity of the terminal, and a conductive ring is provided in each annular groove. The terminal is electrically connected to the mating terminal through the conductive ring, which can replace the traditional way of only using a drum spring to electrically connect the terminal to the mating terminal. The conductive ring is easier to install and replace in the terminal, and the cost of the conductive ring is lower than that of the drum spring, reducing costs and increasing production and assembly efficiency.

[0018] 2. The terminal of the present utility model is electrically connected to the circuit board through a sealing ring made of conductive silicone rubber. The sealing ring is closely attached to the circuit board and the terminal, ensuring the electrical connection stability between the terminal and the circuit board, and solving the problem that a metal elastic sheet is provided between the terminal and the circuit board. The metal elastic sheet is prone to failure during long-term use, the elastic sheet does not rebound, or after the vehicle runs, the poor fit leads to unstable or ineffective electrical connection.

[0019] Through the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings, other features and advantages of the present utility model will become clear. Description of the Drawings

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description thereof, serve to explain the principles of the present invention.

[0021] Figure 1 It is a schematic structural diagram of a terminal of the present invention;

[0022] Figure 2 It is a schematic cross-sectional structural diagram of a terminal of the present invention;

[0023] Figure 3 It is a schematic structural diagram of an electrical connection device of the present invention.

[0024] The markings in the figure are as follows:

[0025] 1. Terminal body; 11. Insertion part, 111. Insertion cavity; 112. Annular groove; 113. Blocking part; 114. Retaining ring; 12. Fixing part; 121. Sealing groove; 122. Clamping groove; 13. Wiring part; 2. Conductive ring; 3. Annular drum spring; 4. Sealing ring; 5. Circuit board. Detailed implementation manners

[0026] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps set forth in these embodiments, numerical expressions and values do not limit the scope of the present invention.

[0027] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as a limitation to the present invention and its application or use.

[0028] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and devices should be regarded as a part of the specification.

[0029] In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0030] According to the first aspect of the present invention, as Figure 1 and Figure 2As shown in the figure, a terminal for plugging into a mating terminal includes a terminal body 1 and at least two conductive rings 2. The terminal body 1 includes a plugging portion 11, a fixing portion 12, and a wiring portion 13 that are connected in sequence. At least the plugging portion 11 has a plugging cavity 111. At least two annular grooves 112 are axially spaced on the inner wall of the plugging cavity 111. Each conductive ring 2 is disposed in a corresponding annular groove 112 and at least partially exposed outside the annular groove 112. The outer diameter of each conductive ring 2 abuts against the bottom wall of the annular groove 112, and the inner diameter of each conductive ring 2 abuts against and is in interference fit with the outer wall of the mating terminal. The terminal body 1 is electrically connected to the mating terminal through the conductive ring 2.

[0031] With the rapid development of new energy electric vehicles, the usage amount of terminals for electrical connection is increasing. The terminals used in charging guns and charging seats mainly transmit electrical signals or conduct electricity. The terminal needs to be plugged into the mating terminal to achieve electrical connection. During the repeated plugging and unplugging process between the terminal and the mating terminal, there is wear, which not only affects the charging effect but also affects the stability of electrical connection. Traditional terminals generally only install a drum spring in the plugging cavity 111 to achieve electrical connection with the mating terminal through the drum spring, using the drum spring to increase the stability of electrical connection. However, the drum spring is not easy to install in the plugging cavity 111, and after being damaged, the terminal 1 and the mating terminal cannot be electrically connected, and the drum spring is not easy to replace, and the cost is relatively high. In the present utility model, at least two axially spaced annular grooves 112 are provided on the inner wall of the plugging cavity 111 of the terminal, and each annular groove 112 is provided with a conductive ring 2. The terminal is electrically connected to the mating terminal through the conductive ring 2, which can replace the traditional way of using only a drum spring for electrical connection between the terminal and the mating terminal. The conductive ring 2 is easier to install and replace in the terminal, and the cost of the conductive ring 2 is lower than that of the drum spring, reducing the cost and increasing the production and assembly efficiency.

[0032] In some embodiments, as Figure 1 and Figure 2 shown, the free end of the plugging portion 11 bends towards the plugging cavity 111 to form a blocking portion 113. The minimum inner diameter of the blocking portion 113 is smaller than the outer diameter of the conductive ring 2 and smaller than the inner diameter of the conductive ring 2. The blocking portion 113 is used to prevent the conductive ring 2 from axially disengaging from the plugging cavity 111.

[0033] In some embodiments, as Figure 2 shown, the axial width of the annular groove 112 is greater than the outer diameter of the conductive ring 2.

[0034] The first advantage of this design is that it facilitates the positioning of the conductive coil 2 in the annular groove 112. The second advantage is that it prevents the edge of the annular groove 112 from damaging the conductive coil 2 during the insertion of the mating terminal, and after insertion, there is enough space in the annular groove 112 to accommodate the elastically deformed conductive coil 2 under the extrusion of the mating terminal.

[0035] In some embodiments, as Figure 1 and Figure 2 shown, at least one annular drum spring 3 is further provided within the annular groove 112 in the insertion cavity 111, and the minimum inner diameter of the annular drum spring 3 is less than or equal to the inner diameter of the conductive coil 2.

[0036] The minimum inner diameter of the annular drum spring 3 and the inner diameter of the conductive coil 2 can be in contact with the outer wall of the mating terminal simultaneously to increase conductivity. If one of the annular drum spring 3 and the conductive coil 2 is damaged, the other can still continue to conduct electricity.

[0037] In some embodiments, as Figure 2 shown, a raised retaining ring 114 is provided inside the insertion cavity 111, and the retaining ring 114 is located on both sides of the annular drum spring 3 to limit the annular drum spring 3.

[0038] The retaining ring 114 limits the annular drum spring 3 within the insertion cavity 111 to prevent the annular drum spring 3 from axially disengaging within the insertion cavity 111.

[0039] In some embodiments, as Figure 2 shown, sealing grooves 121 and clamping grooves 122 are provided at intervals on the outer wall of the fixing portion 12.

[0040] The sealing groove 121 is used to place the sealing ring 4 to seal between the terminal and the installation environment, and the clamping groove 122 is used to be clamped with a fixed position to fix the terminal.

[0041] In some embodiments, as Figure 2 shown, a sealing ring 4 is provided in the sealing groove 121, and the sealing ring 4 is in interference fit with the sealing groove 121.

[0042] The sealing ring 4 is used to prevent water vapor and impurities from entering between the terminal and the installation environment, affecting the electrical connection.

[0043] In some embodiments, the conductive coil 2 and the sealing ring 4 are made of conductive silicone rubber.

[0044] The conductive coil 2 and the sealing ring 4 are made of conductive silicone rubber. Conductive silicone rubber uses silicone rubber as the base rubber and adds conductive fillers to achieve the functions of conduction and electromagnetic shielding. Adding nickel - copper fillers enhances the conductivity, which is stronger than the traditional beryllium - copper conductive coil 2 and hydrogenated nitrile rubber sealing ring 4.

[0045] In some embodiments, a coating is provided at least on the bottom wall of the annular groove 112 and in the area contacting the outer diameter of the conductive ring 2.

[0046] The coating is provided by electroplating, electroless plating, magnetron sputtering or vacuum plating. The coating serves to increase the wear resistance, corrosion resistance and electrical conductivity of the bottom wall of the annular groove 112 of the terminal.

[0047] In some embodiments, as Figure 2 shown, the axial width of the sealing groove 121 is smaller than the diameter of the sealing ring 4, and the radial depth of the sealing groove 121 is smaller than the diameter of the sealing ring 4.

[0048] The axial width of the sealing groove 121 being smaller than the diameter of the sealing ring 4 facilitates the installation and positioning of the sealing ring 4 and has sufficient space to accommodate the compression deformation amount generated during the use of the sealing ring 4. The radial depth of the sealing groove 121 being smaller than the diameter of the sealing ring 4 is designed to enable at least part of the sealing ring 4 to be exposed outside the sealing groove 121, facilitating subsequent sealing of the terminal and the installation environment.

[0049] The present utility model also provides an electrical connection device, as Figure 3 shown, including a circuit board 5. An installation hole is provided on the circuit board 5. The terminal is installed in the installation hole and is electrically connected to the circuit board 5 through the sealing ring 4.

[0050] The terminal is electrically connected to the circuit board 5 through the sealing ring 4 made of conductive silicone rubber. The sealing ring 4 is closely attached to the circuit board 5 and the terminal, ensuring the electrical connection stability between the terminal and the circuit board 5.

[0051] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. A terminal for plugging into a mating terminal, characterized in that, It includes a terminal body and at least two conductive rings. The terminal body includes a plugging portion, a fixing portion and a wiring portion which are connected in sequence. At least the plugging portion has a plugging cavity, and at least two annular grooves are axially spaced on the inner wall of the plugging cavity. Each conductive ring is arranged in the corresponding annular groove and at least part of it is exposed outside the annular groove. The outer diameter of each conductive ring abuts against the bottom wall of the annular groove, and the inner diameter of each conductive ring abuts against and has an interference fit with the outer wall of the mating terminal. The terminal body is electrically connected to the mating terminal through the conductive ring.

2. A terminal according to claim 1, characterized in that, The free end of the plugging portion bends towards the plugging cavity to form a blocking portion. The minimum inner diameter of the blocking portion is smaller than the outer diameter of the conductive ring and smaller than the inner diameter of the conductive ring. The blocking portion is used to prevent the conductive ring from axially disengaging from the plugging cavity.

3. A terminal according to claim 1, characterized in that, The axial width of the annular groove is larger than the outer diameter of the conductive ring.

4. A terminal according to claim 1, characterized in that At least one annular drum spring is further arranged in the plugging cavity within the annular groove. The minimum inner diameter of the annular drum spring is less than or equal to the inner diameter of the conductive ring.

5. A terminal according to claim 4, characterized in that, A raised retaining ring is arranged inside the plugging cavity. The retaining ring is located on both sides of the annular drum spring to limit the annular drum spring.

6. A terminal according to claim 1, characterized in that, Sealing grooves and clamping grooves are spaced on the outer wall of the fixing portion.

7. The terminal according to claim 6, characterized in that, A sealing ring is arranged in the sealing groove, and the sealing ring has an interference fit with the sealing groove.

8. A terminal according to claim 7, wherein The materials of the conductive ring and the sealing ring are conductive silicone rubber.

9. A terminal according to claim 1, characterized in that, A plating layer is provided at least on the bottom wall of the annular groove and the area in contact with the outer diameter of the conductive ring.

10. A terminal according to claim 7, characterized in that, The axial width of the sealing groove is smaller than the diameter of the sealing ring, and the radial depth of the sealing groove is smaller than the diameter of the sealing ring.

11. An electrical connection device, comprising a terminal as claimed in claim 7 or 8, characterized in that, It includes a circuit board. Mounting holes are provided on the circuit board. The terminal is mounted in the mounting holes and is electrically connected to the circuit board through the sealing ring.

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