WO2023078246A1

WO2023078246A1 - Transition connection terminal, charging receptacle and charging plug

Info

Publication number: WO2023078246A1
Application number: PCT/CN2022/129020
Authority: WO
Inventors: 王超
Original assignee: 长春捷翼汽车科技股份有限公司
Priority date: 2021-11-04
Filing date: 2022-11-01
Publication date: 2023-05-11
Also published as: CN216214460U

Abstract

The present invention provides a transition connection terminal, a charging receptacle and a charging plug. The transition connection terminal comprises a plugging terminal (1) and a transition terminal (2). The plugging terminal (1) comprises an external plug portion (11) and a plugging matching portion (13) which are sequentially arranged. The transition terminal (2) comprises a transition matching portion (21) and a wire connection portion (23) which are sequentially arranged. The plugging matching portion (13) is detachably connected to the transition matching portion (21). The transition connection terminal contains a plugging terminal and a transition terminal which are detachably connected. A plugging terminal can be simply replaced when damaged, thereby achieving rapid installation, maintenance and replacement, and reducing the overall replacement cost.

Description

A transition connection terminal, charging socket and charging plug

related application

This application claims the priority of the Chinese utility model patent with the patent application number 202122683188.2, the application date is November 4, 2021, and the invention title is "a transitional connection terminal, charging socket and charging plug".

technical field

The invention relates to the field of electrical connection, in particular to a transition connection terminal, a charging socket, and even a charging plug.

Background technique

With the depletion of gasoline fuel resources and environmental protection reasons, more and more countries regard new energy vehicles as the development direction of future vehicles, and the charging system for new energy batteries is also developing faster and faster, but the current The charging stand in the charging system is mostly installed on the car with the charging stand body, the terminal is connected to the cable, the clamp is fixed to the terminal, and the rear cover is fixed on the charging stand body after passing through the cable. Too many times, or the terminal is damaged due to short circuit. When the terminal needs to be repaired and replaced, all the cables of the charging stand need to be removed from the vehicle body, and then the rear cover of the charging stand is disassembled, and the fixing clip is disassembled. Take out the terminal of the connecting cable. Since the terminal connecting cable is usually crimped or welded, it is necessary to cut off the damaged terminal. Since there is no repair allowance for the cable length, the cable may need to be replaced. The charging stand needs to be repaired only after the entire cable exterior and adhesive tape are removed. The man-hour is very long, and there are many parts that need to be disassembled. Most of the time, the charging stand will be replaced entirely, and the maintenance cost is very high.

Therefore, in the field of electrical connection, there is an urgent need for a transitional connection terminal that can be quickly disassembled, and a charging socket or a charging plug with such a transitional connection terminal, which can replace some damaged parts, improve maintenance efficiency, and reduce maintenance costs.

application content

In order to realize quick maintenance of the terminal, the present invention provides a transition connection terminal, a charging socket and a charging plug. It only needs to plug in the terminal, so as to realize the effects of rapid installation, maintenance, replacement, etc., and reduce the overall replacement cost.

The technical solution adopted by the present invention to solve its technical problems is:

A terminal for transitional connection, including a plug-in terminal and a transition terminal, the plug-in terminal includes an external plug-in part and a plug-in fitting part arranged in sequence, the transition terminal includes a transition-fit part and a wire connection part arranged in sequence, the plug-in fitting part and the The transition fit is detachably attached.

A charging socket, the charging socket includes the above-mentioned transition connection terminal, and the wire connection part is connected with a wire.

A charging plug, the charging plug includes the above-mentioned transition connection terminal, and the wire connection part is connected with a wire.

The beneficial effects of the present invention are:

1. The terminal of the transition connection contains a plug-in terminal and a transition terminal for detachable connection. When the plug-in terminal is damaged, only the plug-in terminal can be replaced, thereby realizing the effects of quick installation, maintenance, replacement, etc., and reducing the overall replacement the cost of.

2. The present invention provides a transition terminal with a transition fitting part, so that the plug fitting part can adapt to the processing error of the transition terminal, so that the coupling force between the plug terminal of the present invention and the transition terminal is greater, ensuring more contact area, and realizing Better electrical and mechanical properties.

3. In the plug terminal of the present invention, the thickness of one side of the external plug strip is smaller than the thickness of the other side, the thickness of the other side of the external plug strip is increased, and the angle inside the other side of the external plug strip is reduced, so that After the mating end is inserted, the inner plane on the other side of the expanded external plug-in strip forms surface contact with the mating end surface, which increases the contact area between the two and ensures the electrical performance of the plug-in terminal.

4. The cylindrical socket of the present invention contains a columnar cavity, the cross-sectional area of one end of the columnar cavity is less than or equal to the cross-sectional area of the other end of the columnar cavity, and the columnar socket can be inserted into When the external plug-in piece expands, it forms a larger contact area with the surface of the columnar plug-in portion.

5. One end of the columnar insertion part of the present invention is provided with chamfering or rounding, which can facilitate insertion; the transition terminal of the present invention can be provided with an elastic sleeve, and when the transition terminal itself is insufficient in elasticity due to design reasons, the elastic sleeve can be used to supplement the transition The gripping force of a terminal against a mating mating portion.

6. The plug-in terminal and the transition terminal of the present invention adopt plating, which can better increase the anti-corrosion performance.

7. The plug-in terminal of the present invention, by setting the external plug-in strip in a corrugated structure, not only increases the contact area between the external plug-in strip and the mating end, enhances the electrical performance of the plug-in terminal, but also can play a role in the mating end. To achieve the axial positioning effect, prevent the mating end from coming out of the plug terminal, and improve safety and reliability.

Description of drawings

The accompanying drawings constituting a part of the application are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute improper limitations to the present invention.

Fig. 1 is an exploded schematic diagram of a terminal of a transition connection according to the present invention.

Fig. 2 is a schematic diagram of connection of terminals of the transition connection according to the present invention.

Fig. 3 is a schematic diagram of a plug terminal.

Fig. 4 is a structural schematic diagram of the first annular groove and the annular protrusion.

Fig. 5 is a sectional view of the working state of the elastic sleeve.

Fig. 6 is an exploded schematic view of the charging socket.

1. Plug terminal; 2. Transition terminal; 3. Charging socket;

11. External plugging part; 12. Plugging connection part; 13. Plugging fitting part;

21. Transition fit part; 22. Transition connection part; 23. Wire connection part; 24. Elastic kit;

111. External inserts; 121. Second annular groove; 131. Chamfering or rounding; 132. First annular groove;

211, external insert piece; 212, tapered section; 213, first convex ring section; 214, concave ring section; 215, second convex ring section; 221, third annular groove.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

A terminal for transition connection, including a plug terminal 1 and a transition terminal 2, the plug terminal 1 includes an external plug-in part 11 and a plug-in fitting part 13 arranged in sequence, and the transition terminal 2 includes a transition fitting part 21 and a wire connection arranged in sequence part 23, the plug fitting part 13 is detachably connected with the transition fitting part 21, as shown in Fig. 1 to Fig. 3 .

The external socket part 11 is used for connecting with other terminals, the plug fitting part 13 is used for connecting with the transition terminal 2 , the transition fitting part 21 is used for connecting with the plug terminal 1 , and the wire connecting part 23 is used for connecting with wires. When the plug-in terminal 1 is damaged, only the plug-in terminal 1 can be replaced without replacing the transition terminal 2, which realizes quick installation, maintenance, replacement, etc., and reduces the overall replacement cost.

Further, the plug fitting portion 13 is sleeved inside the transition fit portion 21 , or the plug fit portion 13 is sleeved outside the transition fit portion 21 . That is to say, during specific implementation, the transition fit portion 21 can be sleeved outside the plug fit portion 13, or the plug fit portion 13 can be sleeved outside the transition fit portion 21, as long as the plug fit portion 13 can be It is a feasible solution to socket with the transition fitting part 21 so as to complete the connection between the plug terminal 1 and the transition terminal 2 .

For example, the plug fitting portion 13 includes a cylindrical socket portion or a cylindrical socket portion, and the corresponding transition fit portion 21 includes the cylindrical socket portion or the cylindrical socket portion. When the plug fitting part 13 includes a columnar socket part and the transition fit part 21 includes a cylindrical socket part, the columnar plug part of the plug fit part 13 and the cylindrical socket part of the transition fit part 21 are mated and inserted; The plug fitting part 13 includes a cylindrical plug part, and when the transition fit part 21 includes a cylindrical plug part, the cylindrical plug part of the plug fit part 13 and the cylindrical plug part of the transition fit part 21 are mated and inserted.

In the following, it will be described first by taking the socket fitting part 13 sleeved in the transition fitting part 21 as an example.

In this embodiment, the external plugging part 11 has a cylindrical structure, and the external plugging part 11 includes a plurality of external plugging strips 111 arranged along the circumferential direction. The external inserting strips 111 are elongated, and there are gaps between two adjacent external inserting strips 111 , as shown in FIGS. 1 to 3 .

In this embodiment, the external inserting strip 111 extends in a corrugated shape in the length direction. The length direction is the same as the axial direction of the plug terminal 1 . By setting the external plug strip 111 in a corrugated structure, the contact area between the external plug strip 111 and the mating end is increased, the electrical performance of the plug terminal 1 is enhanced, and the mating end can be axially positioned to prevent The mating end is detached from the plug terminal 1, which improves safety and reliability.

In this embodiment, one side of the external plugging strip 111 faces the mating portion 13 , and the thickness of the other side of the external plugging strip 111 is greater than the thickness of one side of the external plugging strip 111 . That is, the left side of the external plugging strip 111 faces the mating portion 13 , and the thickness of the right side of the external plugging strip 111 is greater than the thickness of the left side of the external plugging strip 111 , as shown in FIG. 1 . The thickness of the front end of the external insertion strip 111 is increased, so that after the mating end is inserted, the internal plane of the front end of the expanded external insertion strip 111 forms surface contact with the surface of the mating end, which increases the contact area between the two and ensures that the plug terminal 1 electrical performance.

In this embodiment, the plug fitting part 13 and the transition fitting part 21 may be connected by thread, plug or screw. The threaded connection means that the plug fitting part 13 and the transition fitting part 21 respectively have a threaded structure, and can be screwed together, or connected together by using separate studs and nuts. The advantage of threaded connection is detachability, which can be assembled and disassembled repeatedly, and is suitable for scenes that require frequent disassembly. Plug-in means that there is an embedded structure at the joint between the plug-fit part 13 and the transition fit part 21, and the two can be plug-fitted together. The advantage is that there is no need to use tools, and it is only necessary to assemble the plug fitting part 13 and the transition fitting part 21 together, which is suitable for maintenance and other scenarios. The screw connection is to provide connecting holes on the plug fitting part 13 and the transition fitting part 21 respectively, and the screws pass through the connecting holes to connect the plug fitting part 13 and the transition fitting part 21 together.

In this embodiment, a plug connection part 12 is provided between the external plug part 11 and the plug fitting part 13. The plug connection part 12 has a cylindrical structure. Two annular grooves 121. The sealing ring is arranged in the second annular groove 121 , which can play a role of sealing and prevent dust, water or mist from entering the external socket 11 from the socket connection portion 12 and affecting the electrical performance of the external socket 11 .

In this embodiment, the plug fitting part 13 includes a columnar plug part, and the corresponding transition fit part 21 includes a cylindrical plug part, and the cylindrical plug part of the plug fit part 13 and the cylindrical plug part of the transition fit part 21 part mating plug. A chamfer or rounding 131 is provided on the end edge of one end of the columnar insertion part. The chamfer or rounding 131 can guide the plug fitting part 13 to facilitate its insertion into the transition fitting part 21 .

In this embodiment, the plug terminal 1 has an integrated structure, and the external plug part 11, the plug connection part 12 and the plug mating part 13 are sequentially connected along the axial direction of the plug terminal 1, and the plug connection part 12 is used for connecting The external socket part 11 and the socket fitting part 13 are shown in Fig. 1 and Fig. 3 .

In this embodiment, a first annular groove 132 is provided on the outer peripheral surface of the columnar insertion part, and an annular protrusion is provided on the inner peripheral surface of the cylindrical insertion part. As shown in FIG. 4 , the first annular groove 132 The groove 132 is matched with the annular protrusion. The cylindrical socket part of the plug fitting part 13 is mated with the cylindrical socket part of the transition fit part 21 , and the outer peripheral surface of the cylindrical socket part is provided with a first annular groove 132 . In some embodiments, the inner peripheral surface of the cylindrical socket part is provided with an annular protrusion. When the socket fitting part 13 is plugged into the transition fitting part 21, the first annular groove 132 can be connected to the transition fitting part 21. The inner annular protrusion fits to prevent the plug fit 13 from being separated from the transition fit 21 .

In this embodiment, the transition fitting portion 21 is in a cylindrical structure, and the transition fitting portion 21 includes a plurality of external plug-in pieces 211 arranged along the circumferential direction, and the plurality of external plug-in pieces 211 are arranged in the circumferential direction and constituted inside the transition fit portion 21. columnar cavity. The outer connecting pieces 211 have a long strip structure, and there is a gap between two adjacent outer connecting pieces 211 , so that the outer connecting pieces 211 can have elasticity, thereby facilitating the insertion of the mating portion 13 .

In this embodiment, one end of the columnar cavity is an inlet end, and the columnar insertion part can be inserted into the columnar cavity from one end of the columnar cavity, and the cross-sectional area of one end of the columnar cavity is less than Or equal to the sectional area of the other end of the columnar cavity, that is, the left side of the columnar cavity of the transition fit part 21 faces the wire connection part 23, and the cross-sectional area of the left side of the columnar cavity of the transition fit part 21 is larger than the transition fit part The cross-sectional area of the right side of the columnar cavity of 21 is shown in Fig. 1 . If the inner diameter of the cylindrical cavity of the transition fit part 21 is exactly the same as the outer diameter of the plug fit part 13, the plug fit part 13 cannot be inserted into the cylindrical cavity of the transition fit part 21 due to tolerance fit. , or the columnar cavity of the transition fit part 21 and the plug fit part 13 have a mostly inaccessible area, resulting in the failure to achieve electrical conduction, or the small contact area leads to increased contact resistance, and the temperature rise of the circuit is too high. Therefore the inventor sets the interior of the columnar cavity of the transition fit portion 21 to have a small opening and a large tapered rear end, so that the plug fit portion 13 can be inserted into the transition fit portion 21, and the outer plug piece 211 can be made larger. The deformation space is large, so that the transition fit part 21 and the mating fit part 13 can obtain greater gripping force after they are mated.

Further, along the direction from the wire connecting portion 23 to the transition fitting portion 21 , the outer surface of the transition fitting portion 21 includes a tapered section 212 , as shown in FIG. 1 . Along the direction from the wire connecting portion 23 to the transition fitting portion 21 , the outer diameter of the tapered section 212 decreases gradually. In this embodiment, a first protruding ring segment 213 , a concave ring segment 214 and a second protruding ring segment 215 are arranged at the end of the tapered segment 212 in sequence. Wherein, the outer diameter of the first convex ring segment 213 is equal to the outer diameter of the second convex ring segment 215, the outer diameter of the first convex ring segment 213 is greater than the outer diameter of the concave ring segment 214, the first convex ring segment 213, the concave ring segment 214 and the second convex ring segment 215 can increase the strength of the transition fit portion 21 and ensure the connection force between the transition fit portion 21 and the plug fit portion 13 .

In some embodiments, the concave ring section 214 is matched with the elastic sleeve 24, as shown in FIG. When the diameter difference of the mating portion 13 is large, the gripping force of the transition terminal 2 on the mating portion 13 will be insufficient, resulting in a small contact area between the transition terminal 2 and the mating portion 13 and poor electrical performance. When the elasticity of the transition terminal 2 itself is insufficient due to design reasons, the elastic sleeve 24 can be used to supplement the gripping force of the transition terminal 2 on the mating portion 13 . The elastic sleeve 24 can be an elastic rubber body, or an elastic rigid body with openings. The transition fitting portion 21 of the transition terminal 2 can continue to expand outward, increasing the gripping force of the transition fitting portion 21 on the plug fitting portion 13 .

In this embodiment, a transition connection portion 22 is provided between the transition fitting portion 21 and the wire connection portion 23 , and a third annular groove 221 for installing a sealing ring is provided outside the transition connection portion 22 . Setting the sealing ring at the third annular groove 221 can play a sealing role, preventing dust, water or mist from entering the transition fitting portion 21 from the transition connection portion 22 and affecting the electrical performance of the transition fitting portion 21 .

In this embodiment, the wire connection part 23 is a cylindrical structure or a sheet structure or a radial opening structure. The wire connection part 23 can choose different shapes according to the cross-sectional shape of the paired wire or the corresponding connection method, and its cross-section can also be circular, elliptical, open ring, U-shaped, flat or polygonal.

In this embodiment, the length of the columnar insertion part is 25%-100% of the length of the columnar cavity. The plug-in fitting part 13 and the transition fitting part 21 can be plugged into the transition fitting part 21 completely, and can also be partially plugged into the transition fitting part 21, but if the plug-in fitting part 13 is too short, the contact area is not enough, and the resulting in an increase in resistance. If the mating portion 13 is too long, raw materials will be wasted, which is also not conducive to sealing. In order to ensure a good electrical connection between the plug-fit part 13 and the transition fit part 21, the contact area between the plug-fit part 13 and the transition fit part 21 is a key characteristic. The larger the contact area, the smaller the voltage drop. In order to verify The relationship between the ratio of the length of the plug fitting part 13 to the transition fitting part 21 and the voltage drop between the plug fitting part 13 and the transition fitting part 21, the inventor selected 10 groups of the columnar plug parts with different lengths and the same The columnar cavity was tested, and then the voltage drop between different columnar sockets and the columnar cavity was tested by passing a current, and the results were recorded in Table 1. In this embodiment, a voltage drop greater than 4mV is unqualified.

Table 1: Effect of the ratio of the length of the cylindrical socket to the length of the cylindrical cavity on the voltage drop

It can be seen from the above table 1 that when the percentage of the length of the columnar plug-in part to the length of the columnar cavity is less than 25%, the voltage drop is greater than 4mV, and the voltage drop is too large to cause voltage loss and affect the insertion The transmission efficiency of terminal 1 and transition terminal 2 wastes electric energy, so the voltage drop greater than 4mV is unqualified; and when the percentage of the length of the columnar plug-in part to the length of the columnar cavity is greater than 25%, the voltage drop is better than the qualified value, and the larger the ratio, the better the electrical performance of the length of the plug-fitting part 13 and the transition-fitting part 21. Therefore, the inventors set the ratio between the length of the columnar plug-in part and the length of the columnar cavity. The percentage is 25%-100%.

In this embodiment, the relational expression between the outer diameter of the part of the columnar socket inserted into the columnar cavity and the minimum inner diameter of the columnar cavity is:

(r1-r2)/r1×100%=N;

r1 is the outer diameter of the part where the columnar socket is inserted into the columnar cavity, and the unit is mm;

r2 is the minimum inner diameter of the columnar cavity, in mm;

0.5%≤N≤20%.

That is to say r1 is greater than r2, so that the tension of the metal makes the transition fitting 21 grip the plug fitting 13 more forcefully after insertion.

In order to test the effect of the N value on the gripping force and contact resistance between terminals, the inventor selected ten groups of plug-in fittings 13 and transition fittings 21 with different N values for testing. The test results are shown in Table 2.

The method of testing the grip force is: use a sheet piezoelectric dynamometer attached to the mating part 13, so that the outer diameter of the mating part 13 to which the piezoelectric dynamometer is attached = r1, and the mating part of the plug 13 is mated with the transition fit portion 21, and then read the value on the sheet piezoelectric dynamometer, which is the gripping force of the plug-in terminal. In this embodiment, the gripping force greater than 30N is an ideal value.

The test method for the contact resistance of the plug-in terminal is: use a micro-resistance measuring instrument, measure the resistance at the contact position between the plug-fitting part 13 and the transition-fitting part 21, and read the value on the micro-resistance measuring instrument. The contact resistance between the transition fit portion 21 and the transition fit part 21 is ideally less than 50 μΩ in this embodiment.

Table 2: Influence of different values of N on the grip force and contact resistance of the plug fit 13 and the transition fit 21

It can be seen from Table 2 that when the value of N is less than 0.5%, the gripping force between the terminals is too small, which is less than the ideal value, and it is easy to cause the insertion between the terminals to be weak, and the contact resistance between the terminals is too large, exceeding Ideal value requirements will lead to excessive temperature rise at the connection, reducing safety and reducing the service life of electrical devices. When the value of N is greater than 20%, due to the large difference between the outer diameters of the columnar socket part and the columnar cavity, the plug fitting part 13 cannot be inserted and normal conduction cannot be performed. Therefore, the inventor chooses the value range of N to be between 0.5% and 20%, which not only ensures that the plug-fitting part 13 is relatively easy to insert into the transition-fitting part 21, but also ensures that the connection between the plug-fitting part 13 and the transition-fitting part 21 The gripping force and contact resistance meet the requirements of the ideal value, which greatly guarantees the mechanical and electrical properties of the terminal and prolongs the service life of the terminal.

Next, it will be described by taking the socket fitting part 13 sleeved outside the transition fitting part 21 as an example, as shown in FIG. 6 .

In this embodiment, the plug fitting portion 13 includes a cylindrical plug portion, and the corresponding transition fit portion 21 includes the columnar plug portion, and the cylindrical plug portion includes a plurality of outer plug pieces arranged along the circumferential direction. 211 , a plurality of external plugs 211 are arranged along the circumferential direction and form a cylindrical cavity inside the mating portion 13 .

In this embodiment, the external plug-in sheet 211 extends in a corrugated shape in the length direction. One side of the external connecting piece 211 faces the external connecting portion 11 , and the thickness of the other side of the external connecting piece 211 is greater than the thickness of the one side of the external connecting piece 211 . The end edges of the transition fit 21 are provided with chamfers or roundings 131 .

Further, the plug fitting part 13 is screwed, plugged or screwed to the transition fitting part 21 .

Furthermore, along the direction from the outer socket portion 11 to the socket fitting portion 13 , the outer surface of the plug fitting portion 13 includes a tapered section 212 .

Furthermore, the length of the columnar insertion part is 25%-100% of the length of the columnar cavity.

In this embodiment, the external plugging part 11 has a cylindrical structure, and the external plugging part 11 includes a plurality of external plugging strips 111 arranged along the circumferential direction. The external cutting strips 111 have a long strip structure, there is a gap between two adjacent external cutting strips 111 , and the external cutting strips 111 extend in a corrugated shape along the length direction. One side of the external strip 111 faces the mating portion 13 , and the thickness of the other side of the external strip 111 is greater than the thickness of one side of the external strip 111 .

In some embodiments, at least part of the surface of the plug terminal 1 and/or the transition terminal 2 has a plating layer (that is, at least a part of the surface of the plug terminal 1 has a plating layer, or at least a part of the surface of the transition terminal 2 has a plating layer, or At least part of the surface of the plug terminal 1 and the transition terminal 2 has a plating layer) , the plating layer is to improve corrosion resistance, improve electrical conductivity, increase the number of plugging times, and can better prolong the service life of the plug terminal 1 and transition terminal 2 .

In some embodiments, the plating layer adopts a multi-layer plating method. After the processing of the plug-in terminal 1 and/or the transition terminal 2, there are still many gaps and holes under the microscopic interface of the surface. These gaps and holes are the The biggest cause of wear and corrosion of the plug-in terminal 1 and/or transition terminal 2 during use, so it is necessary to coat the surface of the plug-in terminal 1 and/or transition terminal 2 with a bottom layer to fill the gaps and holes on the surface. Make the surface of the plug-in terminal 1 and/or transition terminal 2 flat without holes, and then coat the surface coating, the combination will be stronger and smoother, and the surface of the coating will be free of gaps and holes, so that the wear-resistant performance of the plug-in terminal, Corrosion resistance and electrical performance are better, which greatly prolongs the service life of the terminal.

The underlying material is one or more of gold, silver, nickel, tin, tin-lead alloy and zinc; the surface material is gold, silver, nickel, tin, tin-lead alloy, silver-antimony alloy, palladium, palladium One or more of nickel alloy, graphite silver, graphene silver and silver-gold-zirconium alloy.

In another embodiment, the thickness of the bottom layer is 0.01 μm-15 μm. Preferably, the bottom layer has a thickness of 0.1 μm-9 μm.

In another embodiment, the thickness of the surface layer is 0.5 μm-55 μm. Preferably, the thickness of the surface layer is 1 μm-35 μm.

In order to demonstrate the impact of the thickness change of the bottom layer on the overall performance of the plug-in terminal, the inventor used the same specification and material, different thicknesses of the bottom layer of nickel plating, and the same thickness of the thickness of the silver-plated surface layer of the plug-in terminal sample, and used the same specification for the mating terminal. The connectors were tested for a series of temperature rise and corrosion resistance time, and the experimental results are shown in Table 3 below.

The temperature rise test in Table 3 below is to pass the same current to the plug-in terminal 1 and transition terminal 2 after plugging in, and detect the temperature at the same position of the plug-in terminal before power-on and after the temperature is stabilized in a closed environment, and do Take the absolute value of the difference. In this embodiment, a temperature rise greater than 50K is considered unqualified.

Table 3: Effects of different bottom coating thicknesses on temperature rise and corrosion resistance

It can be seen from the above table 3 that when the thickness of the underlying nickel plating layer is less than 0.01 μm, the temperature rise of the plug-in terminal 1 and the transition terminal 2 is qualified, but because the coating is too thin, the number of corrosion resistance cycles of the plug-in terminal is less than 80 Second, it does not meet the performance requirements of plug-in terminals. The overall performance and life of the plug-in terminal 1 and the transition terminal 2 have a great influence, and in severe cases, the life of the product is suddenly reduced or even a failure or combustion accident occurs. When the thickness of the underlying nickel plating layer is greater than 15 μm, due to the thicker underlying plating layer, the heat generated by the plug-in terminal 1 and the transition terminal 2 cannot be dissipated, so that the temperature rise of the plug-in terminal is unqualified, and the thicker coating is easy to dissipate from the surface of the terminal Falling off, resulting in a decrease in the number of cycles of corrosion resistance. Therefore, the inventors choose the thickness of the bottom plating layer to be 0.01 μm-15 μm. Preferably, the inventors found that when the thickness of the bottom coating is 0.1 μm-9 μm, the comprehensive effect of the temperature rise and corrosion resistance of the plug-in terminal is better. Therefore, in order to further improve the safety, reliability and practicability of the product itself, the bottom layer is preferred. The coating thickness is 0.1 μm-9 μm.

In order to demonstrate the impact of surface coating thickness changes on the overall performance of plug-in terminal 1 and transition terminal 2, the inventor used the same specifications and materials, the same thickness of the nickel-plated bottom layer, and different thicknesses of the silver-plated surface layer. Do a series of temperature rise and corrosion resistance time tests on mating connectors of various specifications, and the experimental results are shown in Table 4 below.

The experimental method is the same as the above-mentioned experimental method.

Table 4: Effect of different surface coating thicknesses on temperature rise and corrosion resistance

It can be seen from the above table 4 that when the thickness of the silver plating layer on the surface is less than 0.5 μm, although the temperature rise of the plug-in terminal 1 and the transition terminal 2 is qualified, but due to the thin coating, the corrosion resistance of the plug-in terminal 1 and the transition terminal 2 The number of sexual cycles is less than 80, which does not meet the performance requirements of plug terminals. It has a great impact on the overall performance and life of the connector, and in severe cases, it will cause a sudden reduction in product life or even a failure and combustion accident. When the thickness of the silver plating layer on the surface is greater than 55 μm, due to the thicker bottom layer, the heat generated by the plug terminal 1 and the transition terminal 2 cannot be dissipated, so that the temperature rise of the plug terminal is unqualified, and the thicker coating is easy to dissipate from the surface of the terminal. Falling off, resulting in a decrease in the number of cycles of corrosion resistance. Moreover, since the surface coating metal is more expensive, the use of a thicker coating does not improve performance, and there is no use value. Therefore, the inventor chooses the thickness of the surface silver plating layer to be 0.1 μm-55 μm.

Preferably, the inventor found that when the thickness of the surface coating is 1 μm-35 μm, the comprehensive effect of the temperature rise and corrosion resistance of the plug terminal 1 and the transition terminal 2 is better. Therefore, in order to further improve the safety, reliability and practicality of the product itself The thickness of the surface coating is preferably 1 μm-35 μm.

In some embodiments, the transition terminal 2 has a plating layer, for example, the transition fitting part 21 has a plating layer, and the wire connecting part 23 has a plating layer, and the material of the plating layer on the transition fitting part 21 and the plating layer on the wire connecting part 23 can be different.

Since the transition fit part 21 is a position that is often plugged and pulled out, it is also a position that is electrically connected to the plug terminal 1. Therefore, the coating material here is generally selected from metals with excellent electrical conductivity, stability and wear resistance. Materials, but such metals are generally precious metals, the price is higher. The wire connection part 23 is a position for electrical connection with the conductor of the cable, and the requirements for stability and wear resistance are not high, and some metal materials with excellent performance, but cheap and that can be used in batches can be selected as the coating material.

In this embodiment, the transition terminal 2 has an integrated structure, the transition fitting part 21, the transition connection part 22 and the wire connection part 23 are sequentially connected along the axis direction of the transition terminal 2, and the transition connection part 22 is used to connect the transition fitting part 21 and The wire connection part 23 is shown in FIG. 1 and FIG. 2 .

In this embodiment, when the plug terminal 1 and the transition terminal 2 are connected, the axis of the plug terminal 1 coincides with the axis of the transition terminal 2 .

A charging socket 3 is introduced below. The charging socket 3 includes the above-mentioned transition connection terminals, and the wire connecting portion 23 is connected with wires, as shown in FIG. 6 .

The plug terminal 1 and the transition terminal 2 are respectively arranged in different parts of the charging socket 3 . When the plug-in terminal 1 is damaged, only the plug-in terminal 1 can be removed and replaced without replacing the transition terminal 2 and other parts of the charging socket 3, which realizes the effects of quick installation, maintenance, and replacement, and reduces the overall replacement cost. the cost of.

A charging plug is introduced below. The charging plug includes the above-mentioned transition connection terminal, and the wire connecting portion 23 is connected with a wire.

When the plug-in terminal 1 is damaged, only the plug-in terminal 1 can be removed and replaced without replacing the transition terminal 2 and other parts of the charging plug, which achieves the effects of quick installation, maintenance, and replacement, and reduces the cost of overall replacement. cost.

The above is only a specific embodiment of the present invention, and cannot limit the scope of the invention, so the replacement of its equivalent components, or the equivalent changes and modifications made according to the patent protection scope of the present invention, should still fall within the scope of this patent. category. In addition, the technical features and technical features, technical features and technical solutions, and technical solutions and technical solutions in the present invention can be used in free combination.

Claims

A transition connection terminal, wherein the transition connection terminal includes a plug terminal (1) and a transition terminal (2), and the plug terminal (1) includes an external socket part (11) and a plug fitting part arranged in sequence (13), the transition terminal (2) includes a transition fit portion (21) and a wire connection portion (23) arranged in sequence, and the plug fit portion (13) is detachably connected to the transition fit portion (21).
The transition connection terminal according to claim 1, wherein the plug fitting part (13) is screwed, plugged or screw connected to the transition fitting part (21).
The transition connection terminal according to claim 1, wherein, the plug fitting part (13) includes a cylindrical plug part or a cylindrical plug part, and the corresponding transition fit part (21) includes the cylindrical plug part or the cylindrical plug part. The cylindrical socket part, the cylindrical socket part of the socket fitting part (13) and the columnar socket part of the transitional fitting part (21) are mated and connected, or the cylindrical socket part of the socket fitting part (13) and the transition The cylindrical socket part of the mating part (21) is mated and connected.
The transition connection terminal according to claim 3, wherein, the end edge of one end of the columnar insertion part is provided with chamfering or rounding (131).
The terminal for transition connection according to claim 3, wherein the cylindrical socket part includes a plurality of external connection pieces (211), and the plurality of external connection pieces (211) are arranged along the circumferential direction and form a cylindrical cavity inside .
The transition connection terminal according to claim 5, wherein one end of the columnar cavity is an inlet end, the columnar insertion part can be inserted from one end of the columnar cavity, and one end of the columnar cavity is The cross-sectional area is smaller than or equal to the cross-sectional area of the other end of the columnar cavity.
The transition connection terminal according to claim 3, wherein a first annular groove (132) is provided on the outer peripheral surface of the columnar insertion part, and an annular protrusion is provided on the inner peripheral surface of the cylindrical insertion part , the first annular groove (132) is matched with the annular protrusion.
The transition connection terminal according to claim 5, wherein the length of the columnar insertion part is 25%-100% of the length of the columnar cavity.
The terminal for transition connection according to claim 5, wherein, the relationship between the outer diameter of the part of the columnar socket inserted into the columnar cavity and the minimum inner diameter of the columnar cavity is:

(r1-r2)/r1×100%=N;

r1 is the outer diameter of the part where the columnar socket is inserted into the columnar cavity, and the unit is mm;

r2 is the minimum inner diameter of the columnar cavity, in mm;

0.5%≤N≤20%.
The transition connection terminal according to claim 1, wherein a plug connection part (12) is provided between the external plug part (11) and the plug fitting part (13), and the plug connection part (12) is externally provided with a The second annular groove (121) for installing the sealing ring.
The terminal for transition connection according to claim 1, wherein a transition connection part (22) is provided between the transition fitting part (21) and the wire connection part (23), and the transition connection part (22) is provided with a seal for installation. The third annular groove (221) of the circle.
The terminal for transition connection according to claim 1, wherein the wire connection part (23) is a cylindrical structure or a sheet structure or a radial opening structure.
The transition connection terminal according to claim 1, wherein at least part of the surface of the plug terminal (1) and/or the transition terminal (2) has a plated layer.
The transition connection terminal according to claim 1, wherein the transition terminal (2) has a plating layer, and the material of the plating layer on the transition fitting portion (21) is different from the material of the plating layer on the wire connection portion (23).
A charging socket, wherein the charging socket comprises the transition connection terminal according to any one of claims 1-14, and the wire connecting part (23) is connected with a wire.
A charging plug, wherein the charging plug comprises the transition connection terminal according to any one of claims 1-14, and the wire connecting portion (23) is connected with a wire.