CN210137048U

CN210137048U - Electric automobile charging power cord plug with quick thermal feedback

Info

Publication number: CN210137048U
Application number: CN201921117726.8U
Authority: CN
Inventors: 田军; 庄锦强
Original assignee: CHANGSHU LIXING PHOTOELECTRIC SCIENCE & TECHNOLOGY Co Ltd
Current assignee: CHANGSHU LIXING PHOTOELECTRIC SCIENCE & TECHNOLOGY Co Ltd
Priority date: 2019-07-17
Filing date: 2019-07-17
Publication date: 2020-03-10
Anticipated expiration: 2029-07-17

Abstract

The utility model discloses an electric vehicle charging power line plug with rapid thermal feedback, which comprises an external outer rubber layer, wherein a copper pin and a pressure cover are arranged in the outer rubber layer, the pressure cover is welded on the copper pin, and a terminal is arranged on the copper pin; a power line with a signal line, a PCB with a temperature sensor chip and a current-carrying line connecting terminal are arranged in the copper pin, the signal line is connected with the PCB, and the power line is connected with the terminal through the current-carrying line connecting terminal; the mounting cavity is provided with a wire outlet, and a power line is led out through the wire outlet and extends out of the outer rubber layer from the power line extension port; at the outlet, a sealing ring is arranged on the power line and is positioned in the clamping groove; a heat conduction copper sheet is arranged in the copper pin, the heat conduction copper sheet is not in contact with the terminal, and the heat conduction copper sheet is in contact with the temperature sensor chip; the plug of the utility model has waterproof and dustproof functions, and reaches IP68 level waterproof and dustproof; the device can conduct heat quickly, feed back temperature timely and accurately, and realize a quick heat signal response function.

Description

Electric automobile charging power cord plug with quick thermal feedback

Technical Field

The utility model relates to a power cord plug specifically is an electric automobile charging power cord plug with quick heat feedback.

Background

With the continuous upgrading of the technology in recent years, new energy automobiles are gradually popularized and begin to enter the lives of common people. The demand of people on new energy automobiles is increasing day by day, and the development prospect of the new energy automobiles cannot be estimated. Since the new energy automobile is powered by the battery, and the battery needs to be charged, the development of the new energy automobile also drives the upgrading development of the charging equipment. In order to meet the requirement of a user on quick charging, a 16A high-power charging mode is mostly adopted for the new energy automobile, the heat generated during charging is relatively more, the potential safety hazard of charging is increased, and therefore a new energy charging power line plug needs to be internally provided with a temperature sensor to monitor the temperature of the charging power line plug in real time. The charging equipment can judge the current charging temperature through the signal resistance value fed back by the temperature sensor, and the charging equipment can further judge whether emergency power-off is needed. Therefore, the accuracy of the resistance value signal fed back by the charging power line plug is particularly important.

Although a general charging power cord plug is provided with a temperature sensor for temperature monitoring, the measurement capability is different. The reason for this is that the influence of the internal important operating components of the plug becomes unstable due to unpredictable external charging environmental conditions, and the resistance value signal fed back by the plug becomes unreliable. In order to ensure the reliability of the charging power line, manufacturers of all large vehicles need to have a waterproof and dustproof electric vehicle charging power line plug with quick thermal feedback to effectively protect internal important components and parts from running reliably.

On the other hand, the timeliness and the sensitivity of the feedback resistance value signal of the built-in temperature sensor are paid attention by various vehicle manufacturers, and how to ensure that the temperature sensor can feed back the real charging temperature in real time becomes a problem which needs to be solved together in the industry of charging power lines of electric vehicles.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that an electric automobile charging power cord plug with quick thermal feedback is provided, this plug has waterproof dustproof function, and accurate temperature when its temperature sensor can in time feed back and charge moreover.

In order to solve the technical problem, the utility model discloses an electric automobile charging power cord plug with quick thermal feedback includes outside outer by the rubber layer, it stretches out mouthful and the power cord stretches out the mouth to have the terminal by the rubber layer outward. The outer rubber layer is made of TPE materials and is arranged on the outer sides of the copper pins and the pressure cover in an injection molding mode, and at the moment, a terminal extension port and a power line extension port can be formed naturally.

The outer rubber layer is internally provided with a copper pin and a pressure cover, the copper pin is in an open shape with an installation cavity, the edge of the copper pin is provided with a convex welding line, and the pressure cover is welded on the copper pin along the welding line to seal the copper pin (except for an outlet). The copper leg is merely a part name, and not all of the copper parts, except for the terminal thereon, the copper leg is an insulating part.

And the copper pin is provided with a terminal comprising a zero line terminal and a live wire terminal, and the terminal extends out of the terminal extending port and is covered by a rubber layer.

The installation cavity is internally provided with a power line with a signal line, a PCB with a temperature sensor chip and a current-carrying line connecting terminal, the signal line is connected with the PCB, the power line is connected with the terminal through the current-carrying line connecting terminal, and the PCB is fixedly sealed and filled in a glue pouring mode.

The installation cavity is provided with a wire outlet, and the power line is led out through the wire outlet and extends out of the outer rubber layer from the power line extension port.

At the wire outlet, the inboard of copper foot, pressure lid is provided with the draw-in groove, be provided with the sealing ring on the power cord, the sealing ring is located the draw-in groove.

The temperature sensor is characterized in that a heat conduction copper sheet is arranged in the copper pin and located between the terminal and the temperature sensor chip, the heat conduction copper sheet is not in contact with the terminal, the heat conduction copper sheet is partially exposed, and the exposed part is in contact with the temperature sensor chip.

Waterproof dustproof:

the utility model discloses plug structure adopts the copper foot to join in marriage the package assembly of pressure lid. The copper pin and the pressure cover are made of the same PA66 material, a welding wire is arranged at the joint, and the two parts are finally fused into a whole through an ultrasonic welding technology. The ultrasonic welding can eliminate the gap at the joint of the parts, thereby achieving the waterproof and dustproof effects.

The copper foot, pressure lid and power cord junction (outlet) can't use ultrasonic welding technique because the material difference is great, and the elasticity that utilizes power cord surface sheath sets up the sealing washer and plays waterproof dustproof effect. Except that the sealing washer, in the wire outlet department, copper foot and pressure lid inboard are provided with a plurality of archs, and copper foot and pressure lid and power cord junction still can set up a plurality of archs (distributing type) promptly, and the frictional force of increase junction reduces the power cord and is being pulled the displacement volume when by external force, prevents that the sealing washer from taking off because of the displacement pine.

Precision parts such as the PCB board that has the temperature sensor chip in the plug are fixed with the mode of encapsulating before the welding encapsulation and are filled, further guarantee precision parts's stability.

And a layer of TPE material (namely an outer coating rubber layer) is injected outside the copper pin and the pressure cover which are welded by ultrasonic waves, and the material has strong adhesive force to the material PA66 of the copper pin and the pressure cover. The completely attached outer rubber layer, the copper feet and the pressure cover can fully play a role in water prevention.

Guarantee that temperature sensor can in time feed back the accurate temperature when charging:

a heat-conducting copper sheet is arranged in the plug copper pin. By utilizing the excellent heat conduction function of the heat conduction copper sheet, the heat on the terminal heat source can be quickly conducted to the temperature sensor chip. The heat conducting copper sheet is partially wrapped by the copper pin plastic (realizing partial exposure), and according to the plug structure, for example, a single-phase polarity plug is positioned between the zero-fire terminals which are most prone to heat. The safety distance between the heat conduction copper sheet and the terminal is ensured to be 1.5mm, the wall thickness of plastic (namely copper pins) wrapped outside the heat conduction copper sheet is ensured to be 1.5mm, and the pressure-resistant reliability of the plug is ensured.

The plug of the utility model has waterproof and dustproof functions, and reaches IP68 level waterproof and dustproof; the device can conduct heat quickly, feed back temperature timely and accurately, and realize a quick heat signal response function.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic view of the plug of the present invention.

Fig. 2 is a transverse explosion diagram of the plug of the present invention.

Fig. 3 is a vertical explosion diagram of the plug of the present invention.

Fig. 4 is a schematic diagram of a copper pin structure.

Fig. 5 is a schematic view of the installation of the seal ring.

Fig. 6 is another angle structure diagram of the copper pin.

Fig. 7 is a schematic structural diagram of a copper pin and its internal components.

Fig. 8 is a vertical cross-sectional view of the copper leg.

Fig. 9 is a transverse cross-sectional view of a copper pin.

Detailed Description

Taking the NEMA14-50P single-phase plug as an example, as shown in FIG. 1, the plug has waterproof and dustproof functions. The explosion diagram is shown in fig. 2 and 3, and comprises an outer coating rubber layer 1, a pressure cover 2, an EV power line 3 with 3 signal lines, a sealing ring 4, a PCB inverted terminal 5, a PCB 6 with a temperature sensor chip, a current-carrying line connecting terminal 7 and a copper pin 8.

As shown in fig. 4, the copper pin 8 is in an open shape with an installation cavity, the joint of the copper pin 8 and the pressure cover 2 is provided with convex bonding wires 9 (ultrasonic bonding wires) which are discontinuously and uniformly distributed, when ultrasonic welding is performed, the bonding wires 9 can be melted, and when solidification is performed, the copper pin 8 and the pressure cover 2 can be bonded into a whole, so that the copper pin is closed.

Install power cord 3, the PCB board 6 and the current-carrying wire connecting terminal 7 that have the temperature sensor chip of taking the signal line in the installation cavity, the signal line passes through PCB back-off terminal 5 and is connected with PCB board 6, and power cord 3 passes through current-carrying wire connecting terminal 7 and is connected with

terminal

13,14,15, PCB board 6 is fixed to be packed through the mode of encapsulating.

As shown in fig. 5 and 6, at the outlet, a clamping groove 10 is provided on the inner side of the copper pin 8 and the pressure cover 2, a sealing ring 4 is provided on the power line 3, and the sealing ring 4 is located in the clamping groove 10. The sealing ring 4 is firmly hooped with the power line 3 and clamped into the clamping groove 10 at the outlet of the copper pin 8. Fig. 5 shows that the steel sealing ring 4 is fixed at a specific position of the power line 3. Because 3 restrictive coatings of power cord can closely hoop the jail with the sealing washer 4 of steel for the TPE material of high elasticity, later fixed sealing washer 4 nests again and goes into the draw-in groove 10 of the copper foot 8, the pressure lid 2 that match with it to make power cord 3, sealing washer 4 and copper foot 8, pressure lid 2 three even as an organic whole, effectively play dustproof and waterproof effect.

As shown in fig. 6, a plurality of distributed protrusions 11 are further disposed on other contact surfaces between the copper pin 8 and the pressure cover 2 and the power line 3, so that friction between the power line 3 and the pressure cover 2 with the copper pin 8 is greatly improved, and the sealing performance is prevented from being affected by sliding between the power line 3 and the sealing ring 4.

As shown in fig. 7, the PCB board 6 with the temperature sensor chip, the PCB flip-chip terminal 5. Here, the encapsulation glue is poured to completely wrap the core component, that is, the PCB 6 is fixedly sealed and filled in a glue pouring manner, so as to further improve the protection level.

The temperature sensor is characterized in that a heat conduction copper sheet 12 is arranged in the copper pin 8, the heat conduction copper sheet 12 is located between the

terminals

13 and 14 and the temperature sensor chip, the heat conduction copper sheet 12 is not in contact with the

terminals

13 and 14, part of the heat conduction copper sheet 12 is exposed, and the exposed part of the heat conduction copper sheet is in contact with the temperature sensor chip. As shown in fig. 8 and 9, the heat-conducting copper sheet 12 may be located between the zero-fire terminals (the zero-line terminal 13 and the fire-line terminal 14) of the copper pin 8, and the heat is quickly transferred to the PCB 6 with the temperature sensor chip by using the heat-conducting property thereof, so as to achieve the function of quick and accurate response. In addition, a safe distance of 1.5mm is reserved between the heat conduction copper sheet 12 and the zero live wire terminal, and the requirement on the voltage withstanding reliability of the charging power line plug is met. The upper and lower wall thicknesses of the heat-conducting copper sheet also ensure the reliability of internal and external high pressure by ensuring the wall thickness of 1.5mm or more.

The first layer of protection is provided by the outer cover rubber layer 1. The outer rubber layer 1 is formed by injection molding of TPE, and the material has strong adhesion to PA66 and can be tightly attached to the outer surfaces of the copper feet 8 and the pressure cover 2 to prevent water and dust from entering.

A second layer of protection is provided by the pressure cap 2 and the copper feet 8. The pressure cover 2 and the copper feet 8 are made of the same material PA66 and are connected by means of ultrasonic welding. The bonding wires uniformly arranged at the joint of the pressure cover 2 and the copper pin 8 in advance can be melted by the action of ultrasonic waves, and the gap between the pressure cover 2 and the copper pin 8 can be filled with the melted bonding wires. After solidification, the waterproof and dustproof functions are achieved.

The third layer of protection is provided by the power supply line 3 and the sealing ring 4. The sealing ring 4 is made of steel material and fixed at a specific position of the power line 3. Because 3 restrictive coatings of power cord can closely hoop the jail with the sealing washer 4 of steel for the TPE material of high elasticity, later fixed sealing washer 4 nests again and goes into in the copper foot 8, the 2 draw-in grooves of pressure lid that match with it to make power cord 3, sealing washer 4 and

copper foot

8, 2 three of pressure lid even as an organic whole, effectively play dustproof and waterproof effect. In addition, other contact surfaces between the copper pin 8 and the pressure cover 2 and between the power line 3 are also provided with distributed bulges, so that the friction force between the power line 3 and the copper pin 8 and between the power line and the pressure cover 2 is greatly improved, and the sliding between the power line 3 and the sealing ring 4 is prevented from influencing the sealing performance.

The fourth layer of protection is provided by sealant filled outside the PCB 6 with the temperature sensor chip. The sealant will completely cover the most important temperature signaling components: the PCB 6 with the temperature sensor chip and the PCB inverted terminal 5 play a final protection role.

The copper feet 8 are internally provided with heat conducting copper sheets. The zero-fire terminal of the charging power line plug is a heating source during charging, and the heat conduction copper sheet is located between the zero-fire terminal and the heat conduction copper sheet. By utilizing the excellent heat conduction function of the heat conduction copper sheet, the heat on the terminal heat source can be quickly conducted to the temperature sensor chip. Finally, the charging power cord plug has excellent response speed and accuracy. In addition, as the zero-fire terminals need to have the requirement of over 2000V on withstand voltage reliability, in order to ensure the normal use of the charging power line plug, a safe distance of 1.5mm is reserved between the heat conduction copper sheet and the zero-fire terminals. The upper and lower wall thicknesses of the heat-conducting copper sheet also ensure the reliability of internal and external high pressure by ensuring the wall thickness of 1.5mm or more.

The above-mentioned embodiment does not limit the utility model in any way, and all the technical solutions that adopt the mode of equivalent replacement or equivalent transform to obtain all fall within the protection scope of the utility model.

Claims

1. The plug is characterized by comprising an outer coating rubber layer, wherein the outer coating rubber layer is provided with a terminal extension port and a power line extension port; a copper pin and a pressure cover are arranged in the outer rubber layer, the copper pin is in an open shape with an installation cavity, a raised welding line is arranged at the edge of the copper pin, and the pressure cover is welded on the copper pin along the welding line to seal the copper pin; the copper pin is provided with a terminal comprising a zero line terminal and a live wire terminal, and the terminal extends out of an extending port of the terminal and is covered by a rubber layer; a power line with a signal line, a PCB with a temperature sensor chip and a current-carrying line connecting terminal are arranged in the mounting cavity, the signal line is connected with the PCB, the power line is connected with the terminal through the current-carrying line connecting terminal, and the PCB is fixedly sealed and filled in a glue pouring mode; the installation cavity is provided with a wire outlet, and the power wire is led out through the wire outlet and extends out of the outer rubber layer from the power wire extension port; at the wire outlet, the inner sides of the copper pins and the pressure cover are provided with clamping grooves, and the power line is provided with a sealing ring which is positioned in the clamping grooves; the copper pin is internally provided with a heat conduction copper sheet, the heat conduction copper sheet is positioned between the terminal and the temperature sensor chip, the heat conduction copper sheet is not in contact with the terminal, and the heat conduction copper sheet is in contact with the temperature sensor chip.

2. The electric vehicle charging power cord plug with rapid thermal feedback of claim 1, wherein: and a plurality of bulges are arranged at the outlet of the copper pin and the inner side of the pressure cover.

3. The electric vehicle charging power cord plug with rapid thermal feedback of claim 1, wherein: the outer rubber layer is made of TPE materials and is injected outside the copper pins and the pressure cover.

4. The electric vehicle charging power cord plug with rapid thermal feedback of claim 1, wherein: the distance between the heat conduction copper sheet and the terminal is greater than or equal to 1.5 mm; the thickness of the plastic outside the heat-conducting copper sheet is larger than or equal to 1.5 mm.

5. The electric vehicle charging power cord plug with rapid thermal feedback of claim 1 or 4, wherein: the heat conduction copper sheet is located between the zero line terminal and the live wire terminal.