Power line charging plug for electric automobile

Abstract

The utility model discloses a power line charging plug for an electric automobile, which comprises a plug body and a cable, and the cable comprises a live wire, a zero wire, a ground wire current-carrying terminal and a signal wire. A plug inner frame of the plug body is provided with a ground wire current-carrying terminal through hole, a zero wire current-carrying terminal through hole and a live wire current-carrying terminal through hole. The current-carrying terminals respectively penetrate through the current-carrying terminal through holes. Two temperature control switch fixing grooves are formed in the upper surface of the plug inner frame, the first temperature control switch fixing groove provided with the first temperature control switch is formed in one side of the zero line current-carrying terminal through hole, and the second temperature control switch fixing groove provided with the second temperature control switch is formed in one side of the live line current-carrying terminal through hole; a first lead of the first temperature control switch is communicated with the ground wire core, a second lead of the first temperature control switch is communicated with a second lead of the second temperature control switch, and a first lead of the second temperature control switch is communicated with the signal wire. The temperature control switch of the charging plug does not need to be directly connected in series with a live wire and a zero wire, and can sense the internal temperature of the plug in time, so that the cost of the temperature control switch can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power line plugs, in particular to a power line charging plug for an electric vehicle. Background Art

[0002] The power source of electric vehicles is batteries, and batteries need to be charged frequently. In order to ensure the safety of electric vehicles during the charging process, traditional electric vehicle charging power cord plugs will have built-in temperature switches to control the temperature of the charging power cord plug in real time. As the temperature of the power cord plug rises, when the temperature reaches a certain value, the temperature control switch will automatically disconnect and the circuit will be broken. However, traditional charging power cords generally only place one temperature control switch on the live wire, while taking all lines into account. The temperature switch of the line that is slightly farther away is not sensitive enough, resulting in the actual temperature being greater than the safe temperature, which poses a hidden danger to safe charging. There are also some that connect a temperature control switch in series on the live wire and the neutral wire respectively, and each temperature control switch controls the temperature of each current-carrying line. In this way, the temperature control switch needs to be connected in series with the live and neutral wires; but in order to achieve fast charging, there are certain requirements for the rated current and voltage of the plug, and the temperature control switch is connected in series on the live and neutral wires. Therefore, there are also certain requirements for the rated current and voltage of the temperature control switch. The higher the rated current and voltage of the temperature control switch, the higher the cost, which also results in higher cost of the power cord charging plug. Summary of the invention

[0003] The utility model aims to provide a power line charging plug for an electric vehicle, which solves the problems existing in the prior art.

[0004] In order to achieve the above technical purpose, the technical solution of the utility model is:

[0005] A power cord charging plug for an electric vehicle, comprising a plug body and a cable, wherein the cable comprises a live wire core, a neutral wire core, a ground wire core and a signal wire core, wherein the live wire core is connected to a live wire current-carrying terminal, the neutral wire core is connected to a neutral wire current-carrying terminal, and the ground wire core is connected to a ground wire current-carrying terminal;

[0006] The plug body comprises an inner plug frame, on which a ground current-carrying terminal through-hole, a neutral current-carrying terminal through-hole and a live current-carrying terminal through-hole are provided, the ground current-carrying terminal passes through the ground current-carrying terminal through-hole, the neutral current-carrying terminal passes through the neutral current-carrying terminal through-hole, and the live current-carrying terminal passes through the live current-carrying terminal through-hole;

[0007] The upper surface of the plug inner frame is provided with a first temperature-controlled switch fixing groove and a second temperature-controlled switch fixing groove, the first temperature-controlled switch fixing groove is arranged on one side of the neutral current-carrying terminal perforation and faces the neutral current-carrying terminal perforation, a first temperature-controlled switch is arranged in the first temperature-controlled switch fixing groove, the second temperature-controlled switch fixing groove is arranged on one side of the live current-carrying terminal perforation and faces the live current-carrying terminal perforation, and a second temperature-controlled switch is arranged in the second temperature-controlled switch fixing groove;

[0008] The first temperature-controlled switch includes a first temperature-controlled switch lead 1 and a first temperature-controlled switch lead 2, the second temperature-controlled switch includes a second temperature-controlled switch lead 1 and a second temperature-controlled switch lead 2, the first temperature-controlled switch lead 1 is connected to the ground wire core, the first temperature-controlled switch lead 2 is connected to the second temperature-controlled switch lead 2, and the second temperature-controlled switch lead 1 is connected to the signal wire core.

[0009] By placing the temperature control switch and the current-carrying terminal in the specified position, the temperature control switch is close to the live current-carrying terminal and the neutral current-carrying terminal respectively, and the fixing grooves of the temperature control switch are isolated from each other, which can effectively insulate. The working principle of the charging plug is as follows: after the two temperature control switches are connected in series, the other two leads are connected to the signal line core and the ground line core respectively, and the controller monitors the on and off of the temperature control switch through the signal line and the ground line; when the temperature exceeds the standard requirements, the temperature control switch inside the plug is automatically disconnected, and after the controller detects that the temperature control switch is disconnected, it controls the charging plug to cut off the power, thereby controlling the equipment to stop working and reducing safety hazards; when the temperature drops and the temperature control switch is restored, the temperature control switch will be turned on again, and the plug can be powered again and resume work.

[0010] The first temperature-controlled switch is adjacent to the neutral current-carrying terminal, and the second temperature-controlled switch is adjacent to the live current-carrying terminal.

[0011] Preferably, the first temperature-controlled switch fixing groove and the second temperature-controlled switch fixing groove are extensions of the upper surface of the plug inner frame, and the first temperature-controlled switch fixing groove and the second temperature-controlled switch fixing groove are perpendicular to the upper surface of the plug inner frame.

[0012] Preferably, the first temperature-controlled switch lead 2 and the second temperature-controlled switch lead 2 are connected through the first connecting terminal, and the second temperature-controlled switch lead 1 is connected to the signal line core through the second connecting terminal.

[0013] Preferably, a first heat shrinkable tube is sleeved on the first connection terminal, and a second heat shrinkable tube is sleeved on the second connection terminal. The heat shrinkable tube has an insulating effect.

[0014] The upper surface of the plug inner frame is provided with a first connection terminal fixing groove and a second connection terminal fixing groove, the first connection terminal is installed in the first connection terminal fixing groove, and the second connection terminal fixing groove is installed in the second connection terminal fixing groove.

[0015] The first connection terminal fixing groove and the second connection terminal fixing groove are extensions perpendicular to the upper surface of the plug inner frame, and the first connection terminal fixing groove and the second connection terminal fixing groove are perpendicular to the upper surface of the plug inner frame.

[0016] The plug body also includes a plug inner mold and a plug outer mold, wherein the plug inner mold covers the outside of the cable, the first temperature control switch, the second temperature control switch and the plug inner frame; the plug outer mold covers the outside of the plug inner mold. The plug inner mold is flush with the cable and completely covers the plug inner frame, the internal wire core and the temperature control switch, which can effectively ensure the quality assurance when the outer mold is injected.

[0017] The plug outer mold also has a hand-held portion and a plug mesh tail sleeved outside the cable. The plug outer mold wraps the cable, and the plug outer mold is designed with mesh tail ribs to ensure that the cable does not break when bent, which has a good swing effect.

[0018] Beneficial effects of the utility model:

[0019] 1. The two temperature control switches inside the charging plug of the utility model are respectively close to the live wire and neutral wire terminals, and can accurately sense the temperature inside the plug;

[0020] 2. The temperature control switch of the charging plug of the utility model does not need to be directly connected in series with the live wire and the neutral wire, and can timely sense the internal temperature of the plug, achieving the same effect and reducing the cost of the temperature control switch;

[0021] 3. The internal design structure of the charging plug of the utility model is compact, occupies a small space, is easy to shape, and takes the cost into consideration, so that the charging plug has a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Figure 1 This is a schematic diagram of the explosion of the internal structure of the charging plug.

[0024] Figure 2 This is the wiring diagram of the temperature control switch.

[0025] Figure 3 This is a wiring diagram for the internal terminals of the charging plug.

[0026] Figure 4 This is a schematic diagram of the plug inner frame assembly.

[0027] Figure 5 Schematic diagram of the charging plug temperature control switch close to the live wire and the neutral wire.

[0028] Figure 6This is a schematic diagram of the charging plug after injection molding the inner mold of the plug.

[0029] Figure 7 This is a schematic diagram of the injection molded outer mold of the charging plug.

[0030] The markings of the components in the accompanying drawings are as follows:

[0031] 1. Plug outer mold; 2. Plug inner mold; 3. Cable; 3L, live wire core; 3N, neutral wire core; 3E, ground wire core; 3S, signal wire core; 4. First temperature control switch; 4a, first temperature control switch lead 1; 4b, first temperature control switch lead 2; 5. Second temperature control switch; 5a, second temperature control switch lead 1; 5b, second temperature control switch lead 2; 6. First connecting terminal; 7. First heat shrink sleeve; 8. Second connecting terminal; 9. Second heat shrink sleeve; 10. Neutral current-carrying terminal; 11. Ground current-carrying terminal; 12. Live current-carrying terminal; 13. Plug inner frame; 14. Neutral current-carrying terminal perforation; 15. Ground current-carrying terminal perforation; 16. Live current-carrying terminal perforation; 17. Second temperature control switch fixing slot; 18. Second connecting terminal fixing slot; 19. First temperature control switch fixing slot; 20. First connecting terminal fixing slot. DETAILED DESCRIPTION

[0032] like Figure 1-7 As shown, a power cord charging plug for an electric vehicle includes a plug body and a cable 3, wherein the cable 3 includes a live wire core 3L, a neutral wire core 3N, a ground wire core 3E and a signal wire core 3S, wherein the live wire core 3L is connected to a live wire current-carrying terminal 12, the neutral wire core 3N is connected to a neutral wire current-carrying terminal 10, and the ground wire core 3E is connected to a ground wire current-carrying terminal 11.

[0033] The plug body comprises a plug outer mold 1, a plug inner mold 2, and a plug inner frame 13. The plug inner frame 13 is provided with a neutral current-carrying terminal through hole 14, a ground current-carrying terminal through hole 15, and a live current-carrying terminal through hole 16. The neutral current-carrying terminal 10 passes through the neutral current-carrying terminal through hole 14, the ground current-carrying terminal 11 passes through the ground current-carrying terminal through hole 15, and the live current-carrying terminal 12 passes through the live current-carrying terminal through hole 16.

[0034] The upper surface of the plug inner frame 13 is provided with a first temperature-controlled switch fixing groove 19, a second temperature-controlled switch fixing groove 17, a first connection terminal fixing groove 20 and a second connection terminal fixing groove 18. The first temperature-controlled switch fixing groove 19 is arranged on one side of the neutral current-carrying terminal through-hole 14 and faces the neutral current-carrying terminal through-hole 14. The first temperature-controlled switch 4 is arranged in the first temperature-controlled switch fixing groove 19. The first temperature-controlled switch 4 and the neutral current-carrying terminal 10 are adjacent to each other. The second temperature-controlled switch fixing groove 17 is arranged on one side of the live current-carrying terminal through-hole 16 and faces the live current-carrying terminal through-hole 16. The second temperature-controlled switch 5 is arranged in the second temperature-controlled switch fixing groove 18, the second temperature-controlled switch 5 is adjacent to and in contact with the live wire current-carrying terminal 12; the first connection terminal fixing groove 20 is located on one side of the first temperature-controlled switch fixing groove 19, and the second connection terminal fixing groove 18 is located on one side of the second temperature-controlled switch fixing groove 17; the first temperature-controlled switch fixing groove 19, the second temperature-controlled switch fixing groove 17, the first connection terminal fixing groove 20 and the second connection terminal fixing groove 18 are formed by an extension of the plug inner frame 13, and the extension is perpendicular to the upper surface of the plug inner frame 13, so that the first temperature-controlled switch fixing groove and the second temperature-controlled switch fixing groove, the first connection terminal fixing groove and the second connection terminal fixing groove are perpendicular to the upper surface of the plug inner frame.

[0035] The first temperature-controlled switch 4 includes a first temperature-controlled switch lead 1 4a and a first temperature-controlled switch lead 2 4b, and the second temperature-controlled switch 5 includes a second temperature-controlled switch lead 1 5a and a second temperature-controlled switch lead 2 5b. The first temperature-controlled switch lead 1 4a is connected to the ground wire current-carrying terminal 11 by riveting and crimping; the first temperature-controlled switch lead 2 4b and the second temperature-controlled switch lead 2 5b are connected through a first connecting terminal 6, and a first heat shrinkable sleeve 7 is sleeved on the first connecting terminal 6, and the first heat shrinkable sleeve 7 is tightly contracted on the first connecting terminal 6, and the first connecting terminal 6 sleeved with the first heat shrinkable sleeve 7 is installed in the first connecting terminal fixing groove 20; the second temperature-controlled switch lead 1 5a is connected to the signal line core 3S through a second connecting terminal 8, and a second heat shrinkable sleeve 9 is sleeved on the second connecting terminal 8, and the second heat shrinkable sleeve 9 is tightly contracted on the second connecting terminal 8, and the second connecting terminal 8 sleeved with the second heat shrinkable sleeve 9 is installed in the second connecting terminal fixing groove 18.

[0036] The plug inner mold 2 is injection molded to cover the outside of the cable 3, the first temperature control switch 4, the second temperature control switch 5 and the plug inner frame 13; the plug outer mold 1 is injection molded to cover the outside of the plug inner mold 2, and the plug outer mold 1 also has a hand-held part and a plug mesh tail sleeved outside the cable.

[0037] The above plug preparation steps:

[0038] 1. According to the design requirements, strip the outer sheath of cable 3, then strip the live wire core 3L, neutral wire core 3N, ground wire core 3E, and signal wire core 3S, control the exposed length of copper wire, and confirm the size meets the requirements after stripping;

[0039] 2. Crimping the first temperature-controlled switch lead wire 4b of the first temperature-controlled switch 4 and the second temperature-controlled switch lead wire 5b of the second temperature-controlled switch 5 together through the first connecting terminal 6, and finally putting the first heat shrinkable sleeve 7 on the first connecting terminal 6 and drying it tightly;

[0040] 3. Connect the neutral wire core 3N and the neutral wire current-carrying terminal 10 into one by crimping; connect the live wire core 3L and the live wire current-carrying terminal 12 into one by crimping; connect the ground wire core 3E and the first temperature control switch lead 4a and the ground wire current-carrying terminal 11 into one by riveting and crimping; connect the signal wire core 3S and the second temperature control switch lead 5a and the second connection terminal 8 into one by riveting and crimping, and cover the second heat shrink sleeve 9 on the second connection terminal 8 and bake it tightly;

[0041] 4. Insert the crimped neutral current-carrying terminal 10 into the neutral current-carrying terminal through-hole 14 of the plug inner frame 13, insert the crimped ground current-carrying terminal 11 into the ground current-carrying terminal through-hole 15 of the plug inner frame 13, and insert the crimped live current-carrying terminal 12 into the live current-carrying terminal through-hole 16 of the plug inner frame 13; then place the second temperature-controlled switch 5 into the second temperature-controlled switch fixing groove 17, the second connecting terminal 8 into the second connecting terminal fixing groove 18, and finally place the first temperature-controlled switch 4 into the first temperature-controlled switch fixing groove 19, and the first connecting terminal 6 into the first connecting terminal fixing groove 20;

[0042] 5. After the inner frame is assembled, the first temperature control switch 4 is in close contact with the neutral current-carrying terminal 10, and can accurately sense the temperature inside the plug; the second temperature control switch 5 is in close contact with the live current-carrying terminal 12, and can accurately sense the temperature inside the plug;

[0043] 6. After confirmation, the plug is injection molded. First, the inner mold of the plug is injection molded, and then the outer mold of the plug is injection molded. After the injection molding is completed, it is necessary to check whether the corresponding size and appearance meet the requirements according to the drawing, and whether the safety size meets the requirements.

[0044] The above embodiments do not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A power cord charging plug for an electric vehicle, characterized in that: It comprises a plug body and a cable, wherein the cable comprises a live wire core, a neutral wire core, a ground wire core and a signal wire core, wherein the live wire core is connected to a live wire current-carrying terminal, the neutral wire core is connected to a neutral wire current-carrying terminal, and the ground wire core is connected to a ground wire current-carrying terminal; the plug body comprises an inner plug frame, wherein the inner plug frame is provided with a ground wire current-carrying terminal through-hole, a neutral wire current-carrying terminal through-hole and a live wire current-carrying terminal through-hole, the ground wire current-carrying terminal penetrates through the ground wire current-carrying terminal through-hole, the neutral wire current-carrying terminal penetrates through the neutral wire current-carrying terminal through-hole, and the live wire current-carrying terminal penetrates through the live wire current-carrying terminal through-hole; The upper surface of the plug inner frame is provided with a first temperature-controlled switch fixing groove and a second temperature-controlled switch fixing groove, the first temperature-controlled switch fixing groove is arranged on one side of the neutral current-carrying terminal perforation and faces the neutral current-carrying terminal perforation, a first temperature-controlled switch is arranged in the first temperature-controlled switch fixing groove, the second temperature-controlled switch fixing groove is arranged on one side of the live current-carrying terminal perforation and faces the live current-carrying terminal perforation, and a second temperature-controlled switch is arranged in the second temperature-controlled switch fixing groove; The first temperature-controlled switch includes a first temperature-controlled switch lead 1 and a first temperature-controlled switch lead 2, the second temperature-controlled switch includes a second temperature-controlled switch lead 1 and a second temperature-controlled switch lead 2, the first temperature-controlled switch lead 1 is connected to the ground wire core, the first temperature-controlled switch lead 2 is connected to the second temperature-controlled switch lead 2, and the second temperature-controlled switch lead 1 is connected to the signal wire core.

2. The electric vehicle power cord charging plug according to claim 1, characterized in that: The first temperature-controlled switch is adjacent to the neutral current-carrying terminal, and the second temperature-controlled switch is adjacent to the live current-carrying terminal.

3. The electric vehicle power cord charging plug according to claim 1, characterized in that: The first temperature-controlled switch fixing groove and the second temperature-controlled switch fixing groove are extensions of the upper surface of the plug inner frame.

4. The electric vehicle power cord charging plug according to claim 1, characterized in that: The first temperature-controlled switch lead 2 is connected to the second temperature-controlled switch lead 2 through a first connecting terminal, and the second temperature-controlled switch lead 1 is connected to the signal line core through a second connecting terminal.

5. The electric vehicle power cord charging plug according to claim 4, characterized in that: A first heat shrinkable tube is sleeved on the first connection terminal, and a second heat shrinkable tube is sleeved on the second connection terminal.

6. The electric vehicle power cord charging plug according to claim 4, characterized in that: The upper surface of the plug inner frame is provided with a first connection terminal fixing groove and a second connection terminal fixing groove, the first connection terminal is installed in the first connection terminal fixing groove, and the second connection terminal fixing groove is installed in the second connection terminal fixing groove.

7. The electric vehicle power cord charging plug according to claim 6, characterized in that: The first connection terminal fixing groove and the second connection terminal fixing groove are extensions of the upper surface of the plug inner frame.

8. The electric vehicle power cord charging plug according to claim 7, characterized in that: The plug body further comprises a plug inner mold and a plug outer mold, wherein the plug inner mold covers the outside of the cable, the first temperature-controlled switch, the second temperature-controlled switch and the plug inner frame; and the plug outer mold covers the outside of the plug inner mold.

9. The electric vehicle power cord charging plug according to claim 8, characterized in that: The plug outer mold is also provided with a hand-holding portion and a plug net tail sleeved outside the cable.

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