CN217215235U - Connecting mechanism with shielding, electric energy transmission device and motor vehicle - Google Patents

Abstract

The utility model provides a connection mechanism with shielding, an electric energy transmission device and a motor vehicle, wherein the connection mechanism comprises a functional cable, a plug terminal, a protective conductor, a grounding terminal, an inner shell which is integrally formed with the functional cable and the plug terminal, and a protective shielding shell which is arranged at least partially on the periphery of the inner shell; the function cable is provided with the shielding layer, protection shielding shell one end is connected with the shielding layer is at least partly electric, the other end is connected with protection conductor or earthing terminal is at least partly electric, take shielded coupling mechanism to set up with the integrative injection moulding's of function cable and plug terminal inner shell, processing is simple, the cost is lower a lot than shielding metal casing, coupling mechanism and the grafting cooperation to joining in marriage coupling mechanism through taking shielding, and with function cable shielding net, the electricity of protection conductor, can effectually shield the inside electromagnetic interference of coupling mechanism, electromagnetic interference to other equipment has been reduced.

Description

Connecting mechanism with shielding, electric energy transmission device and motor vehicle

Technical Field

The utility model relates to an electrical connection field especially relates to a coupling mechanism, electric energy transmission device and motor vehicles of shielding.

Background

A new energy battery of a new energy automobile supplements energy by using a charging system. Besides the charging seat, the charging system also comprises a high-voltage connecting mechanism connected with the battery system, the charging harness is the most important unit in the high-voltage system of the electric vehicle, the traditional charging harness adopts a copper wire as a charging cable, and the tail end of the copper wire is connected with a plug-in terminal and is electrically connected with the battery system. The high pressure coupling mechanism at present all is assembly structure coupling mechanism, has the structure complicacy, the assembly difficulty, and coupling mechanism is with high costs scheduling problem, and the copper product use amount of cable and terminal is high in addition, connects processing more complicacy, also is that high pressure coupling mechanism cost remains high the reason.

In addition, in a general charging system, a temperature measuring structure is installed on a charging seat, and a charging harness connection mechanism is not provided, but the conduction current is the same, and when the temperature of the charging harness connection mechanism rises, the charging harness connection mechanism also needs to be monitored and the charging operation needs to be stopped in time so as to protect the safety of the charging harness and the battery system.

Furthermore, in order to reduce the effect of electromagnetic interference, the high voltage connection mechanism generally needs to shield the PE wire. In the present situation, the connection mechanism is generally not shielded by a shielding device, so that the PE line may have a large electromagnetic interference at the connection mechanism. The metal cover is arranged inside or outside the connecting mechanism, so that a shielding effect can be achieved. However, the metal cover is difficult to process and high in cost; the assembly of the metal cover and the connecting mechanism is also troublesome, and the assembly time is increased; and when the metal covering is in the connecting part, the metal covering is easy to be short-circuited with the guide core, so that the shielding layer is damaged, even the cable is burnt, and serious accidents occur.

Along with the market expansion of electric automobiles, a high-voltage connecting mechanism and an electric energy transmission device which have the advantages of simple structure and cost and can have the PE wire shielding effect are urgently needed for a charging system.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a take shielded coupling mechanism, take shielded coupling mechanism to set up with the integrative injection moulding's of function cable and plug terminal inner shell, processing is simple, and the cost is lower a lot than shielding metal casing, through taking shielded coupling mechanism and to joining in marriage coupling mechanism's grafting cooperation to and be connected with function cable shielding net, protection conductor's electricity, can effectually shield the inside electromagnetic interference of coupling mechanism, reduced other equipment electromagnetic interference.

The above object of the present invention can be achieved by the following technical solutions:

the utility model provides a connecting mechanism with shielding, which comprises a functional cable, a plug terminal, an inner shell which is integrally formed with the functional cable and the plug terminal, and a protective shielding shell which is arranged at least partially on the periphery of the inner shell; the functional cable is provided with a shielding layer, and the protective shielding shell is at least partially electrically connected with the shielding layer.

In a preferred embodiment, the connection mechanism further comprises a protection conductor and a ground terminal, and the protection shielding shell has one end at least partially electrically connected to the shielding layer and the other end at least partially electrically connected to the protection conductor or the ground terminal.

In a preferred embodiment, the protective shielding shell comprises shielding means, which is at least partially electrically connected to the shielding layer.

In a preferred embodiment, the inner surface of the protective shielding shell is further provided with a conductive elastic sheet, the conductive elastic sheet is in contact connection with the shielding layer, and the conductive elastic sheet applies pressure to the shielding layer.

In a preferred embodiment, the pressure applied by the conductive elastic sheet ranges from 0.3N to 95N.

In a preferred embodiment, the impedance between the protective shielding shell and the shielding layer is less than 80m Ω.

In a preferred embodiment, the transfer impedance of the protective shielding shell is less than 100m Ω.

In a preferred embodiment, the protective shield shell is injection molded integrally with at least a portion of the shield layer.

In a preferred embodiment, the mating terminal includes a first fixing portion and a mating portion which are arranged in this order.

In a preferred embodiment, the functional cable comprises a wire core arranged at the innermost part, a shielding layer sleeved at the periphery of the wire core, and an insulating layer sleeved at the periphery of the shielding layer, wherein the first fixing part is electrically connected with the conductive part of the wire core.

In a preferred embodiment, the plug-in part is cylindrical and protrudes at least partially from the inner housing, or the inner housing has a recess, the plug-in part protruding at least partially from the bottom of the recess, but not beyond the inner housing.

In a preferred embodiment, the insertion part is cylindrical, and at least part of the insertion part protrudes out of the outer wall of the inner shell, or an opening boss is arranged on the inner shell, and at least part of the insertion part is arranged in the opening boss.

In a preferred embodiment, the protective shield case wraps at least the first fixing portion and at least a portion of the functional cable, but is insulated from the plug terminal and a conductive portion of the functional cable.

In a preferred embodiment, the inner housing is integrally molded around at least the first fixing portion, the plug terminal and the conductive portion of the functional cable, and serves as an insulation.

In a preferred embodiment, the protective shielding shell wraps at least part of the periphery of the inner shell, and the protective shielding shell is integrally injection-molded on at least part of the periphery of the inner shell.

In a preferred embodiment, the outer circumference of the inner shell and/or the protective shielding shell is further integrally injection molded with an outer insulating shell, which covers at least part of the inner shell and/or the protective shielding shell and at least part of the functional cable and the protective conductor.

In a preferred embodiment, the connection mechanism comprises an interlocking connection mechanism that is at least partially integrally injection molded in the inner shell.

In a preferred embodiment, the ground terminal includes a second fixing portion electrically connected to the protection conductor and a mating portion.

In a preferred embodiment, the counter insertion part is cylindrical and protrudes at least partially from the inner shell, or the inner shell has a groove, and the counter insertion part protrudes at least partially from the bottom surface of the groove but does not protrude beyond the inner shell.

In a preferred embodiment, the opposite insertion part is cylindrical, the opposite insertion part at least partially protrudes out of the outer wall of the inner shell, or an opening boss is arranged on the inner shell, and the opposite insertion part is at least partially arranged in the opening boss.

In a preferred embodiment, the inner shell is integrally molded on the outer periphery of at least the second fixing portion and the conductive portion of the protection conductor, and plays an insulating role.

In a preferred embodiment, the protective shield case is wrapped around at least the outer periphery of the second fixing portion and/or the conductive portion of the protective conductor, and the protective shield case is electrically connected to the second fixing portion and/or the conductive portion of the protective conductor.

In a preferred embodiment, the connection mechanism has a sealing structure.

In a preferred embodiment, the outer periphery of the inner housing and/or the protective shielding housing comprises an outer insulating housing, the sealing structure is over-molded on the inner housing and/or the protective shielding housing, and/or the sealing structure is over-molded on the outer insulating housing.

In a preferred embodiment, the connecting means has at least one temperature measuring structure for measuring the temperature of the plug terminal and/or the ground terminal.

In a preferred embodiment, the connection mechanism has at least one temperature measuring structure, and the temperature measuring structure is attached to the plug terminal and/or the ground terminal and is used for measuring the temperature of the plug terminal and/or the ground terminal.

In a preferred embodiment, the weight of the connecting mechanism is 272g or less.

In a preferred embodiment, the height of the connecting mechanism along the plugging direction is less than or equal to 274 mm.

In a preferred embodiment, the plug terminal and/or the ground terminal are provided at least partially with an electrically conductive corrosion protection layer on the surface.

In a preferred embodiment, the conductive portion of the protection conductor is integrally formed with the ground terminal.

In a preferred embodiment, the conductive part of the functional cable and the plug terminal are integrally formed.

The utility model provides an electric energy transmission device contains above-mentioned arbitrary area shielded coupling mechanism.

The utility model provides a motor vehicle contains above-mentioned arbitrary take shielded coupling mechanism.

The utility model has the characteristics and advantages that:

1. the utility model discloses a take shielded coupling mechanism to set up with the integrative injection moulding's of function cable and plug terminal inner shell, processing is simple, and the cost is lower a lot than the shielding metal casing, through taking shielded coupling mechanism and to joining in marriage coupling mechanism's grafting cooperation to and be connected with function cable shielding net, protection conductor's electricity, can effectually shield the inside electromagnetic interference of coupling mechanism, reduced other equipment electromagnetic interference.

2. The utility model discloses a protection shield shell adopts multiple mode with being connected of function cable shielding net, can stabilize effectual connection protection shield shell and shielding net, realizes better shielding effect.

3. The utility model discloses a protection shield shell, except with function cable shielding net electric connection, still be connected with protection conductor or ground connection terminal electricity, guarantee double ground, even the shielding net ground connection of function cable became invalid, also can carry out ground connection through protection conductor, will shield the electric current smoothly and guide away, reduce electromagnetic shield's interference.

4. The embedded high-voltage interlocking structure replaces the prior assembled high-voltage interlocking, is fixed in the connecting mechanism in an integrated injection molding mode, does not need to be assembled, reduces the cost and completely meets the high-voltage interlocking effect.

5. The sealing structure of the connecting mechanism is not provided with an independent sealing ring, but adopts a secondary injection molding sealing structure instead of the traditional sealing ring, can be directly molded on the connecting mechanism, and has better injection molding combination property and reduced cost.

6. Adopt temperature measurement mechanism, can monitor the inside terminal temperature of coupling mechanism alone, avoid because the temperature sensor of other positions damages, and can't monitor coupling mechanism's temperature.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of the belt shielding connection mechanism of the present invention.

Fig. 2 is a schematic diagram of the structure of the inner shell of the present invention.

Fig. 3 is a schematic view of the structure of the middle protective shielding case of the present invention.

Fig. 4 is a schematic view of the structure of the middle insulating housing of the present invention.

Fig. 5 is a schematic view of the column structure of the middle plug terminal and the grounding terminal of the present invention.

Fig. 6 is a schematic view of the cylindrical structure of the middle plug terminal and the ground terminal of the present invention.

Fig. 7 is a cross-sectional view of the connection mechanism with shield according to the present invention.

Fig. 8 is another cross-sectional view of the connection mechanism with shield according to the present invention.

Fig. 9 is another cross-sectional view of the connection mechanism with shield according to the present invention.

Wherein:

10. a functional cable; 11. a plug-in terminal; 12. a shielding layer; 111 a first fixed part; 112 a plug-in part;

101. a wire core; 102 an insulating layer; 13. an interlocking connection mechanism;

20. a protection conductor; 21. a ground terminal; 211 a second fixed part; 212 pairs of insertion parts;

30. an inner shell;

40. a protective shield case; 41. a shielding device; 42. a conductive spring plate;

50. an outer insulating case;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

A connection mechanism with shielding, as shown in fig. 1-4, comprises a functional cable 10, a plug terminal 11, an inner housing 30 integrally formed with the functional cable 10 and the plug terminal 11, and a protective shielding shell 40 disposed at least partially on the periphery of the inner housing 30; the functional cable 10 is provided with a shielding layer 12, the protective shielding shell 40 being at least partially electrically connected with the shielding layer 12.

In the shielding connection mechanism, since the functional cable 10 needs to transmit a large current, a large electromagnetic field is generated around the functional cable 10 when a current passes through, and in order to prevent the electromagnetic field generated by the large current from electromagnetically interfering with electric appliances in the surrounding environment and affecting the normal operation of other electric appliances, the shielding layer 12 is provided outside the conductive core of the functional cable 10 to electromagnetically shield the electromagnetic field generated after the functional cable 10 is energized.

The functional cable 10 is provided with a shielding layer 12, and one end of the protective shielding shell 40 is electrically connected with at least part of the shielding layer 12, as shown in fig. 7-9.

The utility model discloses a take shielded coupling mechanism to set up with function cable 10 and the integrative injection moulding's of plug terminal 11 inner shell 30, processing is simple, and the cost is lower a lot than shielding metal casing, through taking shielded coupling mechanism and to joining in marriage coupling mechanism's grafting cooperation to and be connected with the electricity of function cable 10 and shielding layer 12, can effectually shield the inside electromagnetic interference of coupling mechanism, reduced other equipment electromagnetic interference.

In one embodiment, the connection mechanism further includes a protection conductor 20 and a ground terminal 21, and the protection shield shell 40 has one end electrically connected to the shield layer 12 and the other end electrically connected to the protection conductor 20 or the ground terminal 11.

The utility model discloses a protection shield shell 40, except that be connected with function cable 10 shielding layer 12 electricity, still be connected with protection conductor 20 or ground connection terminal 21 electricity, guarantee double ground, even function cable 10's shielding net ground connection became invalid, also can carry out ground connection through protection conductor 20, will shield the electric current smoothly and guide away, reduce electromagnetic shield's interference.

In some embodiments, the material of the plug terminal 11 and the ground terminal 21 is a metal conductive material containing one or more of nickel, cadmium, zirconium, chromium, cobalt, manganese, aluminum, tin, titanium, zinc, copper, silver, gold, phosphorus, tellurium, beryllium, and lead, which has stable properties and good conductivity, and the preferred material is a material containing copper or copper alloy or aluminum alloy.

In some embodiments, the conductive portions of the functional cable 10 and the protection conductor 20 are made of one or more materials selected from aluminum, phosphorus, tin, copper, iron, manganese, chromium, titanium and lithium, wherein the conductive portions of the functional cable 10 and the protection conductor 20 are made of aluminum or aluminum alloy, which is one of the main means for energy saving and cost reduction in recent years. In the field of electrical connection, copper wires are used for conducting current, and copper has high conductivity and good ductility. However, as the price of copper increases, the material cost for using copper as a wire becomes higher. For this reason, alternatives to metallic copper are being sought to reduce costs. The content of metal aluminum in the earth crust is about 7.73%, the price is relatively low after the refining technology is optimized, the weight of the aluminum is lighter than that of copper, the conductivity is only inferior to that of the copper, and the aluminum can replace part of the copper in the field of electrical connection. Therefore, aluminum is a trend to replace copper in the field of automotive electrical connection.

In one embodiment, the protective shield 40 includes a shielding device 41, and the shielding device 41 is at least partially electrically connected to the shielding layer 12, as shown in fig. 8.

The protective shielding case 40 includes a shielding device 41, and the shielding device 41 is in contact with the shielding layer 31 and electrically connected to form a closed electromagnetic shielding structure, so that the electromagnetic shielding effect is optimized, and the closed electromagnetic shielding structure is formed, thereby effectively controlling the radiation of the electromagnetic wave and achieving a good shielding effect, as shown in fig. 8 to 9.

The shielding layer 12 may be a shielding net or a conductive foil, the shielding layer 12 is a flexible structure, and the male-end shielding device 41 is generally a rigid structure, and when the shielding layer 12 is deformed, the shielding device 41 and the shielding layer 12 are temporarily disconnected due to the deformation of the shielding layer 12, so that the impedance at the contact position is changed, the shielding effect of the connection structure of the functional cable 10 is unstable, and the transmission of signals is affected. Therefore, the shielding device 41 is required to be stably connected to the shielding layer 12, and the shielding device 41 is generally of a rigid structure, so that the functional cable 10 and the protective shielding shell 40 are electrically connected well, and a stable shielding effect is achieved.

In one embodiment, the inner surface of the protective shielding shell 40 is further provided with a conductive elastic sheet 42, the conductive elastic sheet 42 is in contact connection with the shielding layer 12, and the conductive elastic sheet 42 applies pressure on the shielding layer 12, as shown in fig. 9.

The protective shielding shell 40 is electrically connected with the shielding layer 12 through the conductive elastic sheet 42, at least part of the conductive elastic sheet 42 has elasticity, and the part has the tendency of inward shrinkage so as to compress the functional cable 10, so that on one hand, the stability of the electrical connection between the protective shielding shell 40 and the shielding layer 12 is ensured, and on the other hand, the functional cable 10 can be in contact connection with the conductive elastic sheet 42 when being inserted into the protective shielding shell 40, so that the assembling and processing man-hours are saved, as shown in fig. 7-9.

Further, the pressure applied by the conductive elastic sheet 42 is in the range of 0.3N-95N.

In order to verify the influence of the pressure applied by the conductive elastic sheet 42 to the shielding layer 12 on the contact resistance between the conductive elastic sheet 42 and the shielding layer 12, the inventor performed a pertinence test, taking the pressure applied by the conductive elastic sheet 42 to the shielding layer 12 as an example, the inventor selects the conductive elastic sheet 42 and the shielding layer 12 with the same shape and the same size, and designs the pressure between the conductive elastic sheet 42 and the shielding layer 12 to be different pressures to observe the contact resistance between the conductive elastic sheet 42 and the shielding layer 12.

The contact resistance is detected by measuring the resistance at the contact position of the conductive elastic sheet 42 and the shielding layer 12 using a micro resistance measuring instrument, and reading the value of the micro resistance measuring instrument, in this embodiment, the contact resistance is less than 50 μ Ω, which is an ideal value.

Table 1: the pressure of different electrically conductive shell fragment and shielding layer influences the contact resistance:

as can be seen from table 1, when the pressure between the conductive elastic sheet 42 and the shielding layer 12 is less than 0.3N, the bonding force is too small, and the contact resistance between the two is higher than the ideal value, which is not desirable. When the pressure between the conductive elastic sheet 42 and the shielding layer 12 is greater than 95N, the contact resistance is not significantly reduced, the material selection and processing are more difficult, and the shielding layer 12 is damaged by an excessive pressure. Therefore, the inventors set the pressure applied by the conductive dome 42 between 0.3N and 95N.

In addition, the inventor finds that when the pressure between the conductive elastic sheet 42 and the shielding layer 12 is greater than 0.5N, the contact resistance between the conductive elastic sheet 42 and the shielding layer 12 is relatively good, and the trend of reduction is very fast, and when the pressure between the conductive elastic sheet 42 and the shielding layer 12 is less than 50N, the manufacturing, installation and use of the conductive elastic sheet are convenient, and the cost is low, so the inventor prefers that the pressure applied by the conductive elastic sheet 42 is in the range of 0.5N-50N.

In one embodiment, the connection between the conductive elastic sheet 42 and the shielding shell 40 is a welding method, an adhesive method, an integral injection molding method, an embedding method or a clamping method.

The welding mode, including laser welding, ultrasonic welding, resistance welding, pressure diffusion welding or brazing, etc., adopts concentrated heat energy or pressure to make the contact position of the conductive elastic sheet 42 and the inner surface of the protective shielding shell 40 produce melt connection, the welding mode is stable in connection, and the connection of dissimilar materials can be realized, and the conductive effect is better because the contact positions are mutually fused.

The bonding method is to bond the conductive elastic sheet 42 and the inner surface of the protective shielding shell 40 together by using conductive adhesive, and this method does not require using equipment, and the conductive elastic sheet 42 and the inner surface of the protective shielding shell 40 are fully and electrically connected by using the conductive adhesive, so that the conductive effect is good, but the connection strength is low, and the bonding method is suitable for use environments with low requirements on the connection strength, and low melting points or low strength of the inner surfaces of the conductive elastic sheet 42 and the protective shielding shell 40.

The integral injection molding mode is that the conductive elastic sheet 42 is placed in an injection mold, and when the connecting mechanism is machined, the conductive elastic sheet is directly and integrally injected on the inner surface of the protective shielding shell 40, so that the machining is simple and rapid, other assembling processes are omitted, and the assembling time is saved.

The embedding method is to set a groove on the inner surface of the protective shielding case 40, and then embed the conductive elastic piece 42 into the groove, so that the conductive elastic piece 42 is fixed on the inner surface of the protective shielding case 40.

The clamping manner is to arrange a clamping jaw or a clamping groove on the inner surface of the protective shielding shell 40, arrange a corresponding clamping groove or clamping jaw on the conductive elastic sheet 42, and then assemble and connect the clamping jaw and the clamping groove, so that the conductive elastic sheet 42 is fixed on the inner surface of the protective shielding shell 40.

The utility model discloses a protection shielding shell adopts multiple mode with being connected of function cable 10 shielding layer 12, can stabilize effectual connection protection shielding shell and shielding net, realizes better shielding effect.

In one embodiment, the impedance between the protective shield 40 and the shield layer 12 is less than 80m Ω.

The impedance between the protective shielding shell 40 and the shielding layer 12 is as small as possible, so that the current generated by the shielding layer 12 can flow back to the energy source or the ground without hindrance, and if the impedance between the protective shielding shell 40 and the shielding layer 12 is large, large current can be generated between the protective shielding shell 40 and the shielding layer 12, so that the connection between the functional cable 10 and the plug terminal 11 can generate large radiation.

Taking the influence of the impedance value between the protective shielding shell 40 and the shielding layer 12 on the shielding effect of the shielded connecting mechanism as an example, the inventor selects the functional cable 10 and the plug terminal 11 with the same specification, selects different impedances between the protective shielding shell 40 and the shielding layer 12, manufactures a sample of the connecting structure of the shielded connecting mechanism, and seals the opening of the protective shielding shell 40 by using a metal shielding device to ensure that the whole protective shielding shell 40 is in a completely shielding state. The shielding effect of the connection mechanism with shielding was tested separately, and the experimental results are shown in table 2 below, in this example, it is desirable that the shielding performance value is greater than 40 dB.

The method for testing the shielding performance value comprises the following steps: the test instrument outputs a signal value (this value is a test value of 2) to the protective shielding case 40 and the shielding layer 12, and a detection device is provided outside the connection mechanism with shielding, and this detection device detects a signal value (this value is a test value of 1). Shielding performance value is test value 2-test value 1.

Table 2: influence of impedance between the protective shield case 40 and the shield layer 12 on the shielding performance

As can be seen from table 2, when the impedance value between the protective shield case 40 and the shield layer 12 is greater than 80m Ω, the shielding performance value of the connection mechanism with shield is less than 40dB, which does not meet the requirement of the ideal value, and when the impedance value between the protective shield case 40 and the shield layer 12 is less than 80m Ω, the shielding performance values of the connection mechanism with shield all meet the requirement of the ideal value and the trend is better and better, and therefore, the inventors set the impedance between the protective shield case 40 and the shield layer 12 to be less than 80m Ω.

In one embodiment, the transfer impedance of the protective shield 40 is less than 100m Ω.

The shielding material generally represents the shielding effect of the protective shielding shell 40 by the transfer impedance, and the smaller the transfer impedance, the better the shielding effect. The transfer impedance of the protective shield 40 Is defined as the ratio of the differential mode voltage U induced by the shield per unit length to the current Is passing through the surface of the shield, i.e.:

Z _T ＝U/I _S it can be understood that the transfer impedance of the protective shield shell 40 converts the current of the protective shield shell 40 into differential mode interference. The smaller the transfer impedance is, the better the transfer impedance is, namely the differential mode interference conversion is reduced, and the better shielding performance can be obtained.

In order to verify the influence of the protective shielding cases 40 with different transfer impedance values on the shielding effect of the shielded connecting structure, the inventor selects the protective shielding cases 40, the functional cables 10 and the plug terminals 11 with the same specification, adopts the protective shielding cases 40 with different transfer impedance values, manufactures a series of sample pieces of the connecting structure of the shielded connecting mechanism, and seals the opening of the protective shielding case 40 by using a metal shielding device to ensure that the whole protective shielding case 40 is in a completely shielding state. The shielding effect of the connection structure with the shield is tested, and the experimental results are shown in table 3 below, where in this embodiment, the shielding performance value of the connection structure with the shield is greater than 40dB, which is an ideal value.

The shielding performance value test method comprises the following steps: the test instrument outputs a signal value (this value is the test value 2) to the shielded connection, and a detection device is arranged outside the shielded connection, which detects a signal value (this value is the test value 1). Screening performance value 2-test value 1.

Table 3: effect of the transfer impedance of the protective shield case 40 on the shielding performance

As can be seen from table 3 above, when the transfer resistance value of the shield case 40 is greater than 100m Ω, the shielding performance value of the connection structure with the shield is less than 40dB, which does not meet the requirement of the ideal value, and when the transfer resistance value of the shield case 40 is less than 100m Ω, the shielding performance values of the connection structure with the shield connection mechanism all meet the requirement of the ideal value, and the trend is better, and therefore, the inventors set the transfer resistance of the shield case 40 to be less than 100m Ω.

In one embodiment, the material of the protective shield 40 includes one or more of conductive ceramics, carbon-containing conductors, solid electrolytes, mixed conductors, and conductive polymer materials.

To demonstrate the influence of different materials on the conductivity of the protective shielding case 40, the inventor manufactured samples of the protective shielding case 40 with the same specification and size and different materials, and respectively tested the conductivity of the protective shielding case 40, and the experimental results are shown in table 4 below, where in this embodiment, the conductivity of the protective shielding case 40 is greater than 99% as an ideal value.

Table 4: influence of different materials on the conductivity of the protective shield case 40

As can be seen from table 4 above, the conductivity of the protective shielding case 40 made of the selected material is within the desired range, so the inventor sets the material of the protective shielding case 40 to be one or more of conductive ceramics, carbon-containing conductors, solid electrolytes, mixed conductors, and conductive polymer materials.

Further, the carbon-containing conductor contains one or more of graphite powder, carbon nanotube material and graphene material.

Further, the conductive polymer material is a polymer material containing metal particles, the material of the metal particles contains one or more of nickel, cadmium, zirconium, chromium, cobalt, manganese, aluminum, tin, titanium, zinc, copper, silver, gold, phosphorus, tellurium, and beryllium, and the material of the polymer material is polyvinyl chloride, polyethylene, polyamide, polytetrafluoroethylene, tetrafluoroethylene/hexafluoropropylene copolymer, ethylene/tetrafluoroethylene copolymer, polypropylene, polyvinylidene fluoride, polyurethane, poly terephthalic acid, polyurethane elastomer, styrene block copolymer, perfluoroalkoxyalkane, chlorinated polyethylene, polyphenylene sulfide, polystyrene, silicone rubber, cross-linked polyolefin, ethylene propylene rubber, ethylene/vinyl acetate copolymer, chloroprene rubber, natural rubber, styrene butadiene rubber, nitrile rubber, butadiene rubber, isoprene rubber, ethylene propylene rubber, butadiene rubber, styrene-propylene rubber, butadiene rubber, styrene-acrylonitrile rubber, butadiene rubber, styrene-propylene rubber, butadiene rubber, styrene-propylene rubber, styrene-butadiene rubber, styrene-propylene rubber, styrene-butadiene rubber, styrene-propylene rubber, and the like rubber, One or more of neoprene, butyl rubber, fluororubber, urethane rubber, polyacrylate rubber, chlorosulfonated polyethylene rubber, epichlorohydrin rubber, chlorinated polyethylene rubber, chlorosulfonated rubber, styrene butadiene rubber, hydrogenated nitrile rubber, polysulfide rubber, crosslinked polyethylene, polycarbonate, polysulfone, polyphenylene oxide, polyester, phenol formaldehyde, urea formaldehyde, styrene-acrylonitrile copolymer, polymethacrylate, polyoxymethylene resin.

The properties of the material are illustrated below.

Polyoxymethylene is a smooth, glossy, hard and dense material with a yellowish or white color that can be used for a long period at temperatures ranging from-40 ℃ to 100 ℃. Its wear resistance and self-lubricating property are superior to most engineering plastics, and it also has good oil-resisting and peroxide-resisting properties.

The polycarbonate is colorless and transparent, heat-resistant, impact-resistant and flame-retardant at BI level, and has good mechanical properties at ordinary use temperature. Compared with polymethyl methacrylate with similar performance, the polycarbonate has good impact resistance, high refractive index and good processing performance, and has high-grade flame retardant performance without additives.

The polyamide has the advantages of no toxicity, light weight, excellent mechanical strength, better wear resistance and corrosion resistance, and can replace metals such as copper and the like to be applied to the manufacturing of bearings, gears, pump blades and other parts in the industries such as machinery, chemical engineering, instruments, automobiles and the like. Polycarbonate or polyamide is the first choice for the conductive polymer material.

In one embodiment, the protective shield 40 is manufactured by one or more of an extrusion process, an injection molding process, a dip molding process, a blow molding process, a foaming process, a spraying process, a printing process, and a 3D printing process.

The injection molding process is a process for manufacturing a semi-finished product with a certain shape by pressurizing, injecting, cooling, separating and the like molten raw materials.

The plastic dipping process is a process of electrically heating a workpiece to reach a certain temperature, then dipping the workpiece into plastic dipping liquid, and curing the plastic dipping liquid on the workpiece.

The blow molding process is to extrude a tubular parison by an extruder, put the parison into a mold while the parison is hot, introduce compressed air into the mold for inflation so as to enable the parison to reach a mold cavity shape, and obtain a product after cooling and shaping. The advantages are that: it is suitable for various plastics, and can be used for producing large-scale products, and its production efficiency is high, parison temperature is uniform and equipment investment is less.

The foaming process is that a honeycomb or cellular structure is formed by adding and reacting a physical foaming agent or a chemical foaming agent in a foaming forming process or a foaming polymer material. The basic steps of foam molding are the formation of a bubble nucleus, the growth or enlargement of the bubble nucleus, and the stabilization of the bubble nucleus. At a given temperature and pressure, the solubility of the gas decreases so that saturation is reached, allowing excess gas to escape and form bubbles, thus achieving nucleation.

The spray coating process is a coating method of dispersing a spray material into uniform and fine droplets by a spray gun or a disc atomizer with the aid of pressure or centrifugal force and applying the droplets to the surface of an object to be coated. It can be divided into air spraying, airless spraying, electrostatic spraying and various derivatives of the basic spray pattern described above.

The printing process refers to a mode of transferring ink or other viscous fluid materials to the surface of an object to be coated by using a printing plate, and comprises a screen printing mode, a relief printing mode, a flexographic printing mode, a gravure printing mode or a flat printing mode.

The 3D printing process is a kind of rapid prototyping technology, also called additive manufacturing, and is a technology for constructing an object by using an adhesive material such as powdered metal or plastic and the like and by printing layer by layer on the basis of a digital model file.

In one embodiment, the protective shield shell 40 is injection molded integrally with at least a portion of the shield layer 12. In the injection molding process, the protective shielding shell 40 and the shielding layer 12 of the functional cable 10 can be molded together, so that the connection mechanism with shielding can realize the electrical connection between the protective shielding shell 40 and the shielding layer 12 without using the shielding device 41, and a better shielding effect is achieved.

In one embodiment, the mating terminal 11 includes a first fixing portion 111 and a mating portion 112 disposed in this order, and the mating portion 112 may be cylindrical or columnar. The first fixing portion 111 is electrically connected to the conductive portion of the functional cable 10, so as to achieve the electrical continuity of the circuit. The plug part 112 may be cylindrical or columnar, and may also have terminals in the electric device to be plugged into the connection mechanism, and the tips of the terminals may also be columnar or cylindrical, and the columnar and cylindrical terminals are plugged into each other to realize a pluggable connection for circuit connection, as shown in fig. 5 to 6.

Further, the functional cable 10 includes a core 101 disposed at the innermost portion, a shielding layer 12 disposed at the outer periphery of the core 101, and an insulating layer 102 disposed at the outer periphery of the shielding layer 12, wherein the first fixing portion 111 is electrically connected to the conductive portion of the core 101. The functional cable 10 may be a multi-core cable, each of which represents a different loop, the number of the plug terminals 11 is the same as the number of the core cables, and the first fixing portions 111 of the plurality of plug terminals 11 are electrically connected to the wire portions of the plurality of core cables, respectively. The shielding layer 12 sleeved on the periphery of the wire core 101 is electrically connected with the protective shielding shell 40, and the purpose of shielding signal interference is achieved. The insulating layer 102 sleeved on the periphery of the shielding layer 12 plays a role of insulation protection, and prevents the short circuit caused by the contact of the internal plug terminal 11, the wire core 101 and the shielding layer 12 with an external conductor, as shown in fig. 7-9.

Further, the first fixing portion 111 is connected to the conductive portion of the core 101 by one or more methods of resistance welding, friction welding, ultrasonic welding, arc welding, laser welding, electron beam welding, pressure diffusion welding, magnetic induction welding, screwing, clamping, splicing, and crimping.

The resistance welding method is a method of performing welding by using a strong current to pass through a contact point between an electrode and a workpiece and generating heat by a contact resistance, and the first fixing portion 111 and a conductive portion of the core 101 are welded by using resistance welding.

The friction welding method is a method of welding by plastically deforming a workpiece under pressure using heat generated by friction of a contact surface of the workpiece as a heat source, and the first fixing portion 111 and the conductive portion of the wire core 101 are welded by friction welding.

The ultrasonic welding method is a method in which a high-frequency vibration wave is transmitted to the surfaces of two objects to be welded, and the surfaces of the two objects are rubbed against each other under pressure to form fusion between the molecular layers, and the first fixing portion 111 and the conductive portion of the core 101 are ultrasonically welded.

The arc welding method is a method of connecting metals by converting electric energy into thermal energy and mechanical energy required for welding using an electric arc as a heat source and utilizing a physical phenomenon of air discharge, and the main methods include shielded metal arc welding, submerged arc welding, gas shielded welding, and the like.

The laser welding method is an efficient and precise welding method using a laser beam with high energy density as a heat source.

The electron beam welding mode is that accelerated and focused electron beams are used to bombard the welding surface in vacuum or non-vacuum to melt the workpiece to be welded for welding.

The pressure welding method is a method of applying pressure to a workpiece to bring the joining surfaces into close contact with each other to generate a certain plastic deformation, thereby completing welding.

Diffusion welding refers to a solid state welding method in which the workpiece is pressed at high temperature without visible deformation and relative movement.

The magnetic induction welding mode is that two workpieces to be welded produce instantaneous high-speed collision under the action of strong pulse magnetic field, and the surface layer of the material makes the atoms of the two materials meet in the interatomic distance under the action of very high pressure wave, so that stable metallurgical bonding is formed on the interface. Which is one type of solid state cold welding, the first fixing portion 121, which may or may not have similar properties, and the first cable 11 may be welded together.

The screw connection mode refers to a screw connection, and the connected piece is connected into a whole by a screw element (or a screw thread part of the connected piece) to form a detachable connection. The common threaded connecting parts include bolts, studs, screws, set screws and the like, and are mostly standard parts.

The clamping mode is that the connecting end or the connecting surface is respectively provided with a corresponding clamping jaw or a clamping groove, and the clamping jaw are assembled to be connected together. The clamping mode has the advantages of quick connection and detachability.

The splicing mode is that corresponding grooves and protrusions are respectively arranged on the connecting ends or the connecting surfaces, and the connecting ends or the connecting surfaces are assembled through the mutual joggling or splicing of the grooves and the protrusions so as to be connected together. The splicing mode has the advantages of stable connection and detachability.

And the compression joint mode is a production process for punching the connecting end and the connecting surface into a whole by using a compression joint machine after the connecting end and the connecting surface are assembled. The crimping has an advantage of mass productivity, and a product of stable quality can be rapidly manufactured in a large quantity by using an automatic crimping machine.

Through the connection mode, according to the actual use environment, the first fixing portion 111 and the conductive portion of the wire core 101 are in actual use states, and a proper connection mode or a combination of connection modes is selected to achieve effective electrical connection.

In one embodiment, the plug portion 112 is cylindrical, and the plug portion 112 at least partially protrudes from the inner housing 30, or the inner housing 30 has a groove, and the plug portion 112 at least partially protrudes from the bottom surface of the groove but does not protrude beyond the inner housing 30. The plug part 112 protrudes out of the inner shell 30 and can be electrically connected with the grounding terminal 21 which is sunken in the electric device to be plugged; alternatively, the inner housing 30 has a recess, the plug part 112 protrudes from the bottom of the recess, and the electric device to be plugged has a protruding ground terminal 21, which is electrically connected to the plug part 112 in the recess by plugging, as shown in fig. 5.

In one embodiment, the plug part 112 is cylindrical, and the plug part 112 at least partially protrudes from the outer wall of the inner housing 30, or an opening boss is disposed on the inner housing 30, and the plug part 112 is at least partially disposed in the opening boss. The plug part 112 protrudes out of the outer wall of the inner shell 30 and can be electrically connected with a plug part 212 which is sunken in the plugged electric device in a plug-in mode; alternatively, the inner housing 30 has an opening boss, the mating part 112 is in the opening boss, and the mating electric device has a protruding ground terminal 21, which is electrically connected to the mating part 112 in the opening boss, as shown in fig. 6.

In an embodiment, the protective shielding shell 40 at least wraps the first fixing portion 111 and at least part of the functional cable 10, but is insulated from the plug terminal 11 and the conductive part of the functional cable 10. Since the plug terminal 11 and the wire core 101 are sources of interference signals, in order to shield the interference signals, the protective shielding case 40 at least wraps the plug terminal 11 and the wire core 101, since the plug part 112 and the plug part 212 are electrically connected in an opposite insertion manner, the protective shielding case 40 also needs to form a shielding mechanism together with an electric device, but the protective shielding case 40 at least wraps the first fixing part 111, and in addition, most of the functional cable 10 is signal-shielded by the shielding layer 12, and only a part of the shielding layer 12 extending into the protective shielding case 40 needs to be stripped and electrically connected with the protective shielding case 40, so the protective shielding case 40 at least wraps the first fixing part 111 and at least a part of the functional cable 10, as shown in fig. 7-9.

In one embodiment, the inner housing 30 is integrally molded around at least the first fixing portion 111, the plug terminal 11 and the conductive portion of the functional cable 10, and serves as an insulation. By adopting the integral injection molding manner, the inner shell 30 can be directly molded on the peripheries of the conductive parts of at least the first fixing part 111, the plug terminal 11 and the functional cable 10, and the conductive parts of the plug terminal 11 and the functional cable 10 can be prevented from being connected with other external conductors to cause short circuit.

Further, the protective shielding shell 40 wraps at least a part of the outer periphery of the inner shell 30, and the protective shielding shell 30 is integrally injection-molded on at least a part of the outer periphery of the inner shell 30. By adopting the integral injection molding mode, the protective shielding shell 40 can be directly molded on the periphery of part of the inner shell 30 and directly electrically connected with the shielding layer 12, thereby ensuring the realization of good signal shielding function.

In an embodiment, an outer insulating shell 50 is further integrally molded on the outer circumference of the inner shell 30 and/or the protective shielding shell 40, and the outer insulating shell 50 covers at least a part of the inner shell 30 and/or the protective shielding shell 40 and at least a part of the functional cable 10 and the protective conductor 20. By adopting the integral injection molding method, the outer insulating shell 50 can be directly molded on the periphery of the inner shell 30 and/or the protective shielding shell 40, and the protective shielding shell can be prevented from being connected with other external conductors to cause short circuit.

In an embodiment, the shielded connection comprises an interlocking connection 13, said interlocking connection 13 being at least partially integrally moulded in said inner housing 30. The high-voltage interlocking is a safety design method for monitoring the integrity of a high-voltage loop by using a low-voltage signal, a specific high-voltage interlocking implementation form is characterized in that different projects have different designs, and the high-voltage interlocking is used for monitoring the accidental disconnection of the high-voltage loop so as to avoid the damage to an automobile caused by sudden loss of power. In the present embodiment, as shown in fig. 7, for a U-shaped or V-shaped low-voltage loop having two pairs of pins and electrically connecting the two pairs of pins, it is not necessary to install, and the two pairs of pins can be directly molded in the inner housing 30 by way of integral injection molding, and are connected to the high-voltage interlocking structure in the pairing mechanism in a matching manner, so as to form a low-voltage monitoring loop.

In one embodiment, the ground terminal 21 includes a second fixing portion 211 and an insertion portion 222, the second fixing portion 211 is electrically connected to the protection conductor 20, and the insertion portion 212 has a cylindrical or columnar shape. The second fixing portion 211 is electrically connected to the conductive portion of the protection conductor 20, so as to achieve circuit conduction. The mating portion 212 may be cylindrical or columnar, and may also have terminals in the electrical device that mates with the connection mechanism, and the tips of the terminals may also be cylindrical or columnar, and the columnar and cylindrical terminals mate with each other to realize a pluggable connection for circuit connection, as shown in fig. 5 to 6.

Further, the second fixing portion 211 and the conductive portion of the protection conductor 20 are connected by one or more of resistance welding, friction welding, ultrasonic welding, arc welding, laser welding, electron beam welding, pressure diffusion welding, magnetic induction welding, screwing, clamping, splicing, and crimping. Here, the same manner as the connection of the first fixing portion 111 and the function cable 10 is performed.

In one embodiment, the docking portion 212 is cylindrical, and the docking portion 212 protrudes at least partially from the inner housing 30, or the inner housing 30 has a groove, and the docking portion 212 protrudes at least partially from the bottom of the groove, but not beyond the inner housing 30. The plug part 212 protrudes out of the inner shell 30 and can be electrically connected with the grounding terminal 21 sunken in the plugged electric device in a plug-in mode; alternatively, the inner case 30 has a groove, the insertion portion 212 protrudes from the bottom surface of the groove, and the inserted electric device has a protruding ground terminal 21, which is electrically connected to the insertion portion 212 in the groove by insertion, as shown in fig. 5.

In one embodiment, the insertion portion 212 is cylindrical, and the insertion portion 212 at least partially protrudes from the outer wall of the inner housing 30, or the inner housing 30 is provided with an opening boss, and the insertion portion 212 is at least partially disposed in the opening boss. The plug-in part 222 protrudes out of the outer wall of the inner shell 30 and can be electrically connected with the grounding terminal 21 recessed in the plug-in electric device in a plug-in mode; alternatively, the inner case 30 has an opening boss, the mating portion 212 is provided in the opening boss, and the mating electric device has the projecting ground terminal 21, and is electrically connected to the mating portion 212 provided in the opening boss by mating, as shown in fig. 6.

In one embodiment, the inner housing 30 is integrally molded on the outer periphery of at least the second fixing portion 211 and the conductive portion of the protection conductor 20, and plays an insulating role. By adopting the integral injection molding manner, the inner shell 30 can be directly molded on the peripheries of the conductive parts of at least the second fixing portion 211 and the protection conductor 20, and the conductive parts of the ground terminal 21 and the protection conductor 20 can be ensured not to be connected with other external conductors to cause short circuit.

In one embodiment, the protective shield shell 40 wraps at least the outer periphery of the second fixing portion 211 and/or the conductive portion of the protection conductor 20, and the protective shield shell 40 is electrically connected with the second fixing portion 211 and/or the conductive portion of the protection conductor 20.

The utility model discloses a protection shield shell 40, except with function cable shielding net electric connection, still be connected with protection conductor 20 or ground connection terminal electricity, guarantee double ground, even the shielding net ground connection of function cable became invalid, also can carry out ground connection through protection conductor 20, will shield the electric current smoothly and guide away, reduce electromagnetic shield's interference.

In one embodiment, the attachment mechanism has a sealing structure that is over-molded on the inner housing 30 and/or the protective shield housing 40. The sealing structure can enable the connection mechanism and the oppositely-inserted electric device to be connected more tightly. The sealing structure of the connecting mechanism is not provided with an independent sealing ring, but adopts a secondary injection molding sealing structure to replace the traditional sealing ring, can be directly molded on the connecting mechanism, and has better injection molding combination property and reduced cost.

In one embodiment, the connection mechanism has a sealing structure that is over-molded on the outer insulation shell 50. The sealing structure can enable the connection mechanism and the oppositely-inserted electric device to be connected more tightly.

Furthermore, the sealing structure is made of rubber, soft glue or silica gel. The materials are selected for use, the materials can be heated and melted by an injection molding machine and are molded in a corresponding injection mold, the processing is simple, the adhesion is firm, the service life of the sealing structure 30 can be greatly prolonged, in addition, the materials have good elasticity, the materials can be extruded and deformed during the assembly of a connecting mechanism, the good sealing performance is realized in the filled gap, the materials are water-resistant and oil-resistant, and the sealing structure can be ensured to have longer service life and safe sealing performance.

The maximum gap between the sealing structure and the inner case 30 and/or the protective shield case 40 is less than 520 nm.

In order to verify the influence of the size of the gap between each sealing structure and an adjacent device on the sealing grade, the inventor tests the sealing device by adopting a dry air method, controls the difference of the internal pressure and the external pressure of a tested sample by vacuumizing or air pressurization, and reduces the difference of the internal pressure and the external pressure if leakage exists. The tightness can be detected by detecting a change in air pressure. The detection medium is dry air, is non-toxic and harmless, does not damage the detected product, and simultaneously has clean and tidy detection environment. Taking the example of setting the sealing structure in the inner shell 30 for detection, the inventor completely seals other joints after the inner shell 30 and the protective shielding shell 40 are connected, selects the sealing structure with different sealing degrees, extracts the dry air part in the sealing structure, makes the air pressure in the sealing structure lower than the external air pressure, continuously detects the internal air pressure of the sealing structure, finds that the air pressure is not qualified when increasing, and the test structure is shown in table 5.

TABLE 5 Effect of maximum clearance of seal Structure to inner Shell 30 and/or protective Shield Shell 40 on air pressure variation

Maximum gap (nm)	530	520	500	450	400	350	300	280	260
										Whether the air pressure is changed	Is that	Whether or not	Whether or not	Whether or not	Whether or not	Whether or not	Whether or not	Whether or not	Whether or not

As can be seen from table 5, when the maximum gap between the sealing structure and the inner case 30 and/or the protective shield case 40 exceeds 520nm, the gas pressure changes, which means that gas enters the sealing structure, and the test is failed. The inventors chose to have a maximum gap between the sealing structure and the inner case 30 and/or the protective shield case 40 of not less than 520 nm.

In one embodiment, the connection mechanism has at least one temperature measuring structure for measuring the temperature of the plug terminal 11 and/or the ground terminal 21. The temperature measuring structure can have a certain distance with the plug-in terminal 11 and/or the grounding terminal 21, the heat radiation of the plug-in terminal 11 and/or the grounding terminal 21 is transmitted to the temperature measuring structure, and then the temperature measuring structure measures the temperature of the plug-in terminal 11 and/or the grounding terminal 21, or the temperature measuring structure comprises a conducting element, the conducting element is attached to the plug-in terminal 11 and/or the grounding terminal 21, and the temperature of the plug-in terminal 11 and/or the grounding terminal 21 is measured through the temperature transmitted by the conducting element. And is communicated to a control system for regulating the current passing through the mating terminal 11 and/or the ground terminal 21, thereby regulating the temperature of the connection mechanism 10.

Furthermore, the temperature measuring structure is attached to the plug terminal 11 and/or the grounding terminal 21, the temperature measuring structure is a temperature sensor, the plug terminal 11 and/or the grounding terminal 21 are directly attached, the actual temperature of the plug terminal 11 and/or the grounding terminal 21 can be directly obtained, the actual temperature of the plug terminal 11 and/or the grounding terminal 21 does not need to be obtained through calculation, the structure is simple, and temperature measurement is more accurate.

The temperature sensor is an NTC temperature sensor or a PTC temperature sensor. The two temperature sensors have the advantages of small volume and capability of measuring gaps which cannot be measured by other thermometers; the use is convenient, and the resistance value can be randomly selected from 0.1-100 k omega; the cable connector is easy to process into a complex shape, can be produced in large batch, has good stability and strong overload capacity, and is suitable for a product with small requirement on volume and stable performance, such as an adapter.

Adopt temperature measurement mechanism, can monitor the terminal temperature of coupling mechanism inside alone, avoid because the temperature sensor of other positions damages, and can't monitor coupling mechanism's temperature.

In one embodiment, the material of the plug terminal 11 or the ground terminal 21 includes one or more of nickel, cadmium, zirconium, chromium, cobalt, manganese, aluminum, tin, titanium, zinc, copper, silver, gold, phosphorus, tellurium, and beryllium.

In order to demonstrate the influence of different materials on the conductivity of the plug terminal 11 or the ground terminal 21, the inventors used the ground terminal 11 as an example, and used samples of the plug terminal 11 made of materials with the same specification and different materials to test the conductivity of the ground terminal 11, and the experimental results are shown in table 6, in this embodiment, the conductivity of the ground terminal 11 is greater than 99% as an ideal value.

Table 6: influence of different materials on the conductivity of the ground terminal 11

As can be seen from table 6, the electrical conductivity of the ground terminal 11 made of the selected metal material is within the ideal value range, and in addition, phosphorus is a non-metal material, and cannot be directly used as the material of the metal insert, but can be added into other metals to form an alloy, so as to improve the electrical conductivity and mechanical properties of the metal itself. Therefore, the inventors set the material of the ground terminal 11 to contain one or more of nickel, cadmium, zirconium, chromium, cobalt, manganese, aluminum, tin, titanium, zinc, copper, silver, gold, phosphorus, tellurium, and beryllium.

In one embodiment, the conductive material of the functional cable 10 or the protective conductor 20 contains one or more of aluminum, phosphorus, tin, copper, iron, manganese, chromium, titanium and lithium.

To demonstrate the effect of different materials on the electrical conductivity of the functional cable 10 or the protection conductor 20, the inventor used the functional cable 10 as an example, and used samples of the functional cable 10 made of materials with the same specification and different materials to test the electrical conductivity of the functional cable 10, and the experimental results are shown in table 7, in this example, the electrical conductivity of the functional cable 10 is greater than 99% as an ideal value.

Table 7: effect of different materials on the conductivity of the functional Cable 10

Aluminium	Tin (Sn)	Copper (Cu)	Iron	Manganese oxide	Chromium (III)	Titanium (Ti)	Lithium ion source	Nickel (II)	Cadmium (Cd)	Cobalt
											99.4	99.3	99.3	99.2	99.3	99.4	99.6	99.5	98.7	98.9	98.7

As can be seen from table 7, the conductivity of the functional cable 10 made of the metal material selected by the inventor is within the desired value range, and other materials cannot meet the requirement. In addition, phosphorus is a non-metallic material, and cannot be directly used as a material of the functional cable 10, but phosphorus can be added to other metals to form an alloy, so that the conductivity and mechanical properties of the metal itself are improved. Therefore, the inventor sets the conductive part material of the functional cable 10 or the protective conductor 20 to contain one or more of aluminum, phosphorus, tin, copper, iron, manganese, chromium, titanium, and lithium.

The functional cable 10 or the protective conductor 20 is made of aluminum (or aluminum). The functional cable 10 or the protection conductor 20 is made of aluminum, and the functional cable 10 or the protection conductor 20 is a rechargeable aluminum wire, so that the aluminum wire has excellent electrical performance, the density of the aluminum wire is 1/3 of the copper density, the weight of the aluminum wire is lighter than that of a copper wire bundle, and the cost of aluminum is lower than that of copper.

In one embodiment, the weight of the coupling mechanism is 272g or less. When coupling mechanism's weight is too big, the gravity that coupling mechanism received is also great, under the condition of consumer vibration, can lead to whole coupling mechanism to follow the vibration, because of inertial reason, coupling mechanism can receive great vibration, can send the abnormal sound, and in the consumer use, it is not allowed to take place the abnormal sound.

In order to verify the influence of the weight of the connecting mechanism on the abnormal sound of the connecting mechanism, the inventor adopts samples of the connecting mechanism with different weights, assembles the power distribution and utilization device, installs the samples on a vibration test bed, performs a vibration test, observes whether the abnormal sound occurs in the connecting mechanism in the vibration test process, and shows the test results in table 8.

TABLE 8 influence of weight of the coupling mechanism on the occurrence of abnormal noise in the coupling mechanism

Weight (g)	232	242	252	262	272	282	292	302	312
										Whether abnormal sound is present or not	Whether or not	Whether or not	Whether or not	Whether or not	Whether or not	Is that	Is that	Is that	Is that

As can be seen from table 8, when the weight of the coupling mechanism is greater than 272g, abnormal noise occurs in the coupling mechanism during the vibration test, and the test is not satisfactory. The inventors selected the weight of the connecting mechanism to be 272g or less.

In one embodiment, the height of the connecting mechanism along the plugging direction is less than or equal to 274 mm. The connecting mechanism needs to be installed in the electric device, but generally, the space reserved for the electric device is small, and if the connecting mechanism is high, the connecting mechanism cannot be installed in the electric device, and raw materials are wasted, so that the connecting mechanism needs to be lower than a certain height during design.

In order to verify the influence of the height of the connection mechanism along the plugging and unplugging direction on the installation condition of the connection mechanism, the inventor adopts sample pieces of the connection mechanism with different heights along the plugging and unplugging direction, the sample pieces are installed on the electric device after being assembled, whether the connection mechanism interferes with other parts of the electric device or not in the installation process is observed, and the test result is shown in table 12.

TABLE 9 influence of the height of the connection in the plugging direction on the installation of the connection

Height (mm)	234	244	254	264	274	284	294	304	314
										Whether or not to interfere	Whether or not	Whether or not	Whether or not	Whether or not	Whether or not	Is that	Is that	Is that	Is that

As can be seen from table 9, when the height of the connection mechanism in the inserting and extracting direction is greater than 274mm, the connection mechanism cannot be mounted in the specified position of the electric device, and the test is not qualified. Therefore, the height of the connecting mechanism along the plugging direction is less than or equal to 274 mm.

In one embodiment, the surface of at least a portion of the mating terminals 11 and/or the ground terminals 21 is provided with an electrically conductive corrosion protection layer.

When the materials of the plug terminal 11 and the ground terminal 21 are different from the materials of the mating terminal, electrochemical corrosion may occur between the plug terminal 11 and the ground terminal 21 due to potential difference in electrical conduction, so as to reduce the service life of the plug terminal 11 and the ground terminal 21.

Further, the conductive anti-corrosion layer is attached to at least a portion of the surface of the mating terminal 11 and/or the ground terminal 21 by one or more of electroplating, chemical plating, magnetron sputtering, vacuum plating, pressure welding, diffusion welding, friction welding, resistance welding, ultrasonic welding, or laser welding.

The electroplating method is a process of plating a thin layer of other metals or alloys on the surface of some metals by utilizing the electrolysis principle.

The chemical plating method is a deposition process for generating metal through controllable oxidation-reduction reaction under the catalytic action of the metal.

The magnetron sputtering method is characterized in that electrons spirally run near the surface of a target by utilizing the interaction of a magnetic field and an electric field, so that the probability of generating ions by the electrons colliding with argon is increased. The generated ions collide with the target surface under the action of the electric field so as to sputter the target material.

The vacuum plating method is to deposit various metal and non-metal films on the surface of the plastic part by distillation or sputtering under vacuum condition.

Pressure welding is a method of applying pressure to a welding material to bring the joining surfaces into close contact with each other to cause a certain plastic deformation, thereby completing the welding.

The friction welding method is a method of welding by plastically deforming a workpiece under pressure using heat generated by friction of a contact surface of the workpiece as a heat source.

The resistance welding method is a method of welding by using a strong current to pass through a contact point between an electrode and a workpiece and generating heat by a contact resistance.

The ultrasonic welding method is a method in which high-frequency vibration waves are transmitted to the surfaces of two objects to be welded, and the surfaces of the two objects are rubbed against each other under pressure to form fusion between the molecular layers.

The laser welding method is an efficient and precise welding method using a laser beam with high energy density as a heat source.

Diffusion welding refers to a solid state welding method in which the workpiece is pressed at high temperature without visible deformation and relative movement. In various manners or combinations of the foregoing, the conductive anti-corrosion layer may be stably disposed on at least a portion of the surface of the mating terminal 11 and/or the ground terminal 21.

In one embodiment, the conductive corrosion protection layer has a thickness of 0.3 μm to 3000 μm.

In one embodiment, the conductive corrosion protection layer has a thickness of 2.5 μm to 1000 μm.

In order to test the influence of the thicknesses of different conductive anti-corrosion layers on the voltage drop, the inventor adopts the plug terminal 11 and the ground terminal 21 which are made of the same material and have the same structure, sets the conductive anti-corrosion layers with different thicknesses on at least partial surfaces of the plug terminal 11 and the ground terminal 21 respectively, and then tests the voltage drop of the plug terminal 11 and the ground terminal 21 after being plugged with the mating terminal. The results are shown in Table 10.

In the present embodiment, it is not acceptable that the voltage drop of the mating terminal after the mating of the mating terminal 11 and the ground terminal 21 is greater than 4 mV.

TABLE 10, effect of different conductive anticorrosion layer thicknesses on voltage drop (mV):

as can be seen from the data in table 10 above, when the thickness of the conductive anticorrosive layer is greater than 3000 μm and less than 0.3 μm, the voltage drop of the plugging structure in which the plugging terminal 11 and the ground terminal 21 are plugged with the mating terminal is greater than 4mV, which is not a desirable value, and therefore, the inventors selected the thickness of the conductive anticorrosive layer to be 0.3 μm to 3000 μm. Among them, when the thickness of the conductive corrosion prevention layer is in the range of 2.5 μm to 1000 μm, the voltage drop of the plugging structure in which the plugging terminal 11 and the ground terminal 21 are plugged with the mating terminal is an optimum value, and therefore, it is preferable that the thickness of the conductive corrosion prevention layer is 2.5 μm to 1000 μm.

In one embodiment, the conductive anticorrosion layer is made of a material containing one or more of nickel, cadmium, manganese, zirconium, cobalt, tin, titanium, chromium, gold, silver, zinc, tin-lead alloy, silver-antimony alloy, palladium-nickel alloy, graphite silver, graphene silver, hard silver, and silver-gold-zirconium alloy.

Preferably, the potential of the material of the conductive anti-corrosion layer is between the potential of the materials of the plug terminal 11 and the ground terminal 21 and the potential of the material of the mating terminal. The scheme can reduce electrochemical corrosion generated after the plug terminal 11 and the ground terminal 21 are plugged with the mating terminal.

In order to demonstrate the effect of different conductive corrosion-resistant materials on the performance of the plug terminal 11 and the ground terminal 21, the inventor used the same specification and material and used the plug terminal 11 and the ground terminal 21 made different conductive corrosion-resistant materials to perform a series of corrosion resistance time tests, and the experimental results are shown in table 12.

The corrosion resistance time test in table 11 is to put the samples of the plug terminal 11 and the ground terminal 21 into a salt spray test box, spray salt spray to each position of the plug terminal 11 and the ground terminal 21, take out and clean every 20 hours to observe the surface corrosion condition, i.e. a period, and stop the test until the surface corrosion area of the samples of the plug terminal 11 and the ground terminal 21 is greater than 10% of the total area, and record the period number at that time. In this example, the cycle number is less than 80 times considered as failing.

Table 11: influence of different conductive anti-corrosion layer materials on corrosion resistance of sample pieces of the plug-in terminal 11 and the grounding terminal 21

As can be seen from table 11, when the material of the conductive anti-corrosion layer contains the commonly used metals of tin, nickel and zinc, the experimental results are inferior to those of other selected metals, and the experimental results of other selected metals exceed the standard value more, and the performance is more stable. Therefore, the inventors select a conductive anti-corrosion layer material containing (or being) one or more of nickel, cadmium, manganese, zirconium, cobalt, tin-titanium, chromium, gold, silver, zinc-tin-lead alloy, silver-antimony alloy, palladium-nickel alloy, graphite silver, graphene silver, hard silver, and silver-gold-zirconium alloy. More preferably, the material of the conductive anti-corrosion layer is selected to contain (or be) one or more of cadmium, manganese, zirconium, cobalt, titanium, chromium, gold, silver, tin-lead alloy, silver-antimony alloy, palladium-nickel alloy, graphite silver, graphene silver, hard silver and silver-gold-zirconium alloy.

In one embodiment, the conductive portion of the guard conductor 20 is integrally formed with the ground terminal 21. The conductive portion of the protection conductor 20 and the ground terminal 21 may be made of the same material, that is, the conductive portion of the protection conductor 20 extends out and is molded into the ground terminal 21, so that the use of the ground terminal 21 can be saved, the material cost can be reduced, the processing time can be saved, and the front end of the conductive portion of the protection conductor 20 can be molded into various shapes as required without considering the problem of assembly.

In one embodiment, the conductive portion of the functional cable 10 and the jack terminal 11 are integrally formed. The conductive part of the functional cable 10 and the plug terminal 11 can be made of the same material, that is, the conductive part of the functional cable 10 extends out and is formed into the plug terminal 11, so that the use of the plug terminal 11 can be saved, the material cost is reduced, the processing time is saved, and the front end of the conductive part of the functional cable 10 can be formed into various shapes as required without considering the problem of assembly.

The utility model discloses an electric energy transmission device is disclosed simultaneously, contain as above the coupling mechanism of area shielding.

The utility model also discloses a motor vehicle contains as above take shielded coupling mechanism and above-mentioned electric energy transmission device.

The utility model discloses a take shielded coupling mechanism to set up with the integrative injection moulding's of function cable and plug terminal inner shell, processing is simple, and the cost is lower a lot than shielding metal casing, through taking shielded coupling mechanism and to joining in marriage coupling mechanism's grafting cooperation to and be connected with function cable shielding net, protection conductor's electricity, can effectually shield the inside electromagnetic interference of coupling mechanism, reduced other equipment electromagnetic interference.

The utility model discloses a protection shield shell adopts multiple mode with being connected of function cable shielding net, can stabilize effectual connection protection shield shell and shielding net, realizes better shielding effect.

The utility model discloses a protection shield shell, except with function cable shielding net electric connection, still be connected with protection conductor or ground connection terminal electricity, guarantee double ground, even the shielding net ground connection of function cable became invalid, also can carry out ground connection through protection conductor, will shield the electric current smoothly and guide away, reduce electromagnetic shield's interference.

The embedded high-voltage interlocking structure replaces the prior assembled high-voltage interlocking, is fixed in the connecting mechanism in an integrated injection molding mode, does not need to be assembled, reduces the cost and completely meets the high-voltage interlocking effect.

The sealing structure of the connecting mechanism is not provided with an independent sealing ring, but adopts a secondary injection molding sealing structure instead of the traditional sealing ring, can be directly molded on the connecting mechanism, and has better injection molding combination property and reduced cost.

Adopt temperature measurement mechanism, can monitor the inside terminal temperature of coupling mechanism alone, avoid because the temperature sensor of other positions damages, and can't monitor coupling mechanism's temperature.

The above description is only for the embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.

Claims (33)

1. A connection mechanism with a shield is characterized in that the connection mechanism comprises a functional cable, a plug terminal, an inner shell which is integrally formed with the functional cable and the plug terminal, and a protective shield shell which is arranged on at least part of the periphery of the inner shell; the function cable is provided with a shielding layer, and the protective shielding shell is at least partially electrically connected with the shielding layer.

2. The shielded connection mechanism of claim 1, further comprising a shield conductor and a ground terminal, wherein the shield shell has one end at least partially electrically connected to the shield layer and another end at least partially electrically connected to the shield conductor or the ground terminal.

3. The shielded connection of claim 1, wherein the protective shield shell includes a shield arrangement at least partially electrically connected to the shield layer.

4. The connecting mechanism with the shield according to claim 1, wherein a conductive elastic piece is further disposed on an inner surface of the protective shield shell, the conductive elastic piece is in contact connection with the shield layer, and the conductive elastic piece exerts pressure on the shield layer.

5. The connection mechanism with shielding of claim 4, wherein the conductive elastic sheet exerts the pressure in the range of 0.3N-95N.

6. The shielded connection of claim 1, wherein the impedance between the protective shield shell and the shield layer is less than 80m Ω.

7. The shielded connection of claim 1, wherein the transfer impedance of the protective shield casing is less than 100m Ω.

8. The shielded connection of claim 1, wherein the protective shield shell is integrally injection molded with at least a portion of the shield layer.

9. The shielded connection mechanism of claim 1, wherein the mating terminal includes a first fixing portion and a mating portion arranged in this order.

10. The connecting mechanism with shielding of claim 9, wherein the functional cable comprises a wire core disposed at the innermost portion, a shielding layer disposed at the outer periphery of the wire core, and an insulating layer disposed at the outer periphery of the shielding layer, and the first fixing portion is electrically connected to the conductive portion of the wire core.

11. The shielded connection of claim 9, wherein the mating part is cylindrical and protrudes at least partially from the inner housing, or the inner housing has a recess, and the mating part protrudes at least partially from a bottom surface of the recess but does not protrude beyond the inner housing.

12. The shielded connection of claim 9, wherein the plug portion is cylindrical and at least partially protrudes from an outer wall of the inner housing, or wherein the inner housing has an opening boss and the plug portion is at least partially disposed within the opening boss.

13. The shielded connection of claim 9, wherein the protective shield covers at least the first securing portion and at least a portion of the functional cable, but is insulated from the plug terminal and the conductive portion of the functional cable.

14. The shielded connecting mechanism of claim 9, wherein the inner housing is integrally molded around at least the first fixing portion, the plug terminal and the conductive portion of the functional cable, and serves as an insulator.

15. The shielded connection mechanism of claim 1, wherein the protective shield covers at least a portion of the outer periphery of the inner housing, and the protective shield is integrally molded to at least a portion of the outer periphery of the inner housing.

16. The connecting mechanism with a shield according to claim 1, wherein the outer circumference of the inner shell and/or the protective shielding shell is further integrally molded with an outer insulating shell, and the outer insulating shell covers at least part of the inner shell and/or the protective shielding shell and at least part of the functional cable.

17. The shielded connection of claim 1, wherein the connection comprises an interlocking connection that is at least partially integrally molded in the inner housing.

18. The shielded connection mechanism of claim 2, wherein the ground terminal includes a second fixing portion and a mating portion, the second fixing portion being electrically connected to the protection conductor.

19. The shielded connection of claim 18, wherein the mating portion is cylindrical and protrudes at least partially from the inner housing, or the inner housing has a recess, and the mating portion protrudes at least partially from a bottom surface of the recess but does not extend beyond the inner housing.

20. The shielded connection mechanism of claim 18, wherein the mating portion is cylindrical and at least partially protrudes from an outer wall of the inner housing, or an opening boss is provided on the inner housing and at least partially disposed within the opening boss.

21. The shielded connecting mechanism of claim 18, wherein the inner housing is integrally molded with and insulated from at least the second fixing portion and the conductive portion of the protection conductor.

22. The connection mechanism with a shield according to claim 18, wherein the protective shield shell wraps at least an outer periphery of the second fixing portion and/or the conductive portion of the protective conductor, and is electrically connected to the second fixing portion and/or the conductive portion of the protective conductor.

23. The shielded connection of claim 1, wherein the connection has a sealing structure.

24. The shielded connection according to claim 23, wherein the outer periphery of the inner housing and/or the protective shield shell comprises an outer insulating shell, and the sealing structure is over-molded on the inner housing and/or the protective shield shell, and/or the sealing structure is over-molded on the outer insulating shell.

25. The shielded connection of claim 2, wherein the connection has at least one temperature measurement structure for measuring the temperature of the mating terminal and/or the ground terminal.

26. The shielded connection mechanism of claim 2, wherein the connection mechanism has at least one temperature measurement structure attached to the plug terminal and/or the ground terminal for measuring the temperature of the plug terminal and/or the ground terminal.

27. The shielded connection of claim 1, wherein the connection has a weight of 272g or less.

28. The shielded connection according to claim 1, wherein the height of the connection in the plugging direction is 274mm or less.

29. The shielded connection of claim 2, wherein the receptacle terminal and/or the ground terminal are provided with a conductive corrosion protection layer on at least a portion of their surfaces.

30. The shielded connection of claim 2, wherein the conductive portion of the guard conductor is integrally formed with the ground terminal.

31. The shielded connection of claim 1, wherein the conductive portion of the functional cable and the jack terminal are integrally formed.

32. An electrical energy transfer device comprising a shielded connection according to any one of claims 1 to 31.

33. A motor vehicle, characterized in that it comprises a connection with shielding according to any one of claims 1-31.

Images