Temperature control plug of electric automobile

Abstract

The utility model discloses a temperature control plug of an electric automobile, which is characterized in that the inner side of a panel is provided with a heat conduction block positioned in a shell, the heat conduction block is provided with a heat conduction part in contact with pins, the heat conduction part of the heat conduction block is in close contact with the pins, and the heat conduction block transmits heat of the pins to a temperature sensing probe. Therefore, the temperature parameter obtained by the temperature sensing probe is a set parameter of the temperatures of the plurality of pins, the situation of sudden change of the detected temperature is avoided, the detected temperature parameter value is very stable and accurate, the number of times of circuit disconnection is reduced, the charging effect is improved, and the automobile battery is quite friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of power plugs, and more specifically to a plug with a temperature control function for an electric vehicle. Background Art

[0002] As a universal accessory for electrical products, power plugs are widely used. For the electric vehicle industry, in order to use household 220V AC power to slowly charge the vehicle during peak hours (also known as mode 2 charging) to save charging costs. However, considering the safety of the charging process, in order to prevent overheating, the power plug has a temperature sensor installed inside the plug to monitor the temperature.

[0003] For example, Chinese patent document CN115036759A discloses a vehicle charger, in which a temperature control switch is arranged in a three-pin plug, and the plug of the three-pin plug is connected to the charging cable through the temperature control switch, and the temperature control switch may include a first temperature control switch and a second temperature control switch, and the first temperature control switch and the second temperature control switch are both located in the injection molded part of the three-pin plug, and the plug of the three-pin plug is connected to the charging cable through the temperature control switch, and is electrically connected to the charging gun through the charging cable, and the temperature control switch can detect whether the temperature of the three-pin plug is abnormal, if the socket and / or the three-pin plug is old, poorly connected, or has poor heat dissipation, the temperature of the three-pin plug may be too high under the action of current, and the temperature control switch is disconnected when the temperature of the three-pin plug is too high, so that the vehicle charger is powered off and charging stops, thereby avoiding dangerous things such as thermal deformation and fire of the three-pin plug.

[0004] For example, Chinese patent document CN218386055U discloses a power plug for a household slow charging gun of an electric vehicle, in which the NTC temperature resistor module includes a second NTC temperature resistor and a third NTC temperature resistor. The second NTC temperature resistor is placed next to the plug L, and the third NTC temperature resistor is placed next to the plug N. The outside is injection molded and encapsulated. The second NTC temperature resistor is used to monitor the temperature of the plug L of the power plug, and the third NTC temperature resistor is used to monitor the temperature of the plug N of the power plug.

[0005] The temperature control probe of the prior art is in direct contact with the pins. When the pins heat up, the temperature fluctuation range is large, which will produce instantaneous high temperature, causing the circuit to be suddenly disconnected. However, in fact, instantaneous high temperature does not mean that a fire accident will occur immediately. Only when the power plug maintains a high temperature for a long time will it spontaneously combust. In this way, the charging state will be frequently tripped, and the charging effect is not ideal. At the same time, the temperature control probe detects the pin temperature separately. When one pin is hot and the other pin is cold, the charging is disconnected, which will also cause frequent tripping and unsatisfactory charging effect. Utility Model Content

[0006] In view of the shortcomings of the prior art that the detection temperature fluctuates greatly, resulting in unsatisfactory charging and even affecting the vehicle battery life, the purpose of the utility model is to provide an electric vehicle temperature control plug with stable detection temperature to reduce the number of charging disconnections to further improve the charging effect and be friendly to the vehicle battery.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a temperature control plug for an electric vehicle, comprising a shell, a panel connected to the shell, a cable with one end extending out of the shell and a pin passing through the panel, the cable being provided with a power harness electrically connected to the pin, a heat conductive block and a temperature sensing probe being provided on the inner side of the panel and being located inside the shell, the temperature sensing probe being in contact with the heat conductive block; the heat conductive block being provided with a heat conductive portion being in contact with one end of the pin being located inside the shell, the heat generated by the pin being transferred to the temperature sensing probe through the heat conductive block so that the temperature sensing probe can monitor the temperature of the heat conductive block.

[0008] As a further improvement of the utility model, a temperature control circuit board located in the shell is arranged on the inner side of the panel, the temperature sensing probe is integrated in the temperature control circuit board, and the temperature control circuit board and the heat conductive block are stacked on each other; the cable also includes a signal wiring harness connected to the temperature control circuit board, and the signal wiring harness is electrically connected to the temperature control circuit board.

[0009] As a further improvement of the utility model, a temperature control circuit board with an integrated temperature sensing probe is provided on the inner side of the panel and is located in the shell, and the temperature control circuit board and the heat conductive block are stacked on each other; the cable also includes a signal wiring harness connected to the temperature control circuit board, and the signal wiring harness is electrically connected to the temperature control circuit board.

[0010] As a further improvement of the utility model, the panel is clipped and connected with a cover covering the temperature control circuit board and the heat conductive block. The end of the signal wiring harness connected to the temperature control circuit board passes through the cover. The cover is provided with a wire groove having a similar contour to the heat conductive part and for partially accommodating the power wiring harness.

[0011] As a further improvement of the present invention, the temperature control circuit board is provided with a positioning hole, and the panel is provided with a positioning column that can be inserted into the positioning hole.

[0012] As a further improvement of the utility model, the temperature control circuit board is provided with a connecting hole, the heat conductive block is connected with a connecting bolt which can partially penetrate the connecting hole, and the panel is provided with a connecting groove for accommodating one end of the connecting bolt.

[0013] As a further improvement of the utility model, a groove for accommodating a temperature sensing probe is provided on the surface of the heat conducting block facing the temperature control circuit board.

[0014] As a further improvement of the present invention, the outer wall of the end of the shell through which the cable passes is provided with a plurality of deformation grooves, and the length directions of the plurality of deformation grooves are perpendicular to the length direction of the cable.

[0015] As a further improvement of the present invention, both opposite side walls of the shell are provided with finger pressure surfaces recessed into the shell.

[0016] As a further improvement of the utility model, both of the finger pressure surfaces are provided with finger pressure strips for increasing friction.

[0017] As a further improvement of the utility model, the outer wall of the shell is provided with a finger-pushing surface for pushing by external force.

[0018] The utility model provides a heat-conducting block, and the heat-conducting part of the heat-conducting block is in close contact with the pin. The heat-conducting block transfers the heat of the pin to the temperature sensing probe. The temperature control circuit board located inside or outside the power plug monitors the heat-conducting block in real time. The temperature control circuit board converts the temperature information into an electrical signal and transmits it to a controller external to the cable through a signal harness. The user can adjust the charging state according to the display or alarm of the controller. Compared with the design without over-temperature protection in the prior art, such a design can monitor the temperature of the plug in the charging state in real time, so that the charging can be cut off in time when overheating occurs, avoiding fire or damage to the plug. Since the whole heat-conducting block directly contacts the two pins, instead of requiring two independent heat-conducting blocks to be separated as described in the prior art, the heat-conducting block can be used to control the temperature of the plug in the charging state. The temperature parameter obtained by the temperature sensing probe is a collective parameter of multiple pin temperatures, which avoids the situation of detecting sudden temperature changes, makes the detected temperature parameter value very stable and accurate, reduces the number of circuit disconnections, thereby improving the charging effect and being quite friendly to the car battery. At the same time, the heat conductive block can also dissipate the heat of the pin to the internal space of the shell, and can timely reduce the heat of the pin, thereby ensuring the stability of the pin structure and the stability of power transmission; the design of the heat conductive part can increase the contact area with the corresponding pin outer wall, thereby increasing the heat transferred to the heat conductive block by the pin, reducing the heat dissipated by the pin into the air, and further improving the temperature control circuit board to measure the temperature obtained by the heat conductive block. Accurate value, so that users can make timely decisions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of a temperature control plug.

[0020] Figure 2 This is a three-dimensional image of the temperature control plug without the shell.

[0021] Figure 3 This is the exploded view of the temperature control plug after removing the shell.

[0022] Figure 4 for Figure 3 A three-dimensional image after removing the cables.

[0023] Figure numerals: 1-shell, 11-deformation groove, 12-finger pressure surface, 13-finger pressure strip, 14-finger push surface; 2-panel, 21-positioning column, 22-connecting groove, 23-buckle foot; 3-cable, 31-power harness, 32-signal harness; 4-pin, 5-temperature control circuit board, 51-positioning hole, 52-temperature sensing probe, 53-connecting hole, 54-avoidance hole; 6-heat conductive block, 61-heat conductive part, 62-groove, 63-connecting bolt; 7-cover, 71-wire slot, 72-buckle slot. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same components are denoted by the same reference numerals.

[0025] Reference Figures 1 to 3 As shown, the electric vehicle temperature control plug of this embodiment is mainly composed of a housing 1, a panel 2, a cable 3, a pin 4, a temperature control circuit board 5, a heat conducting block 6 and a cover 7. The outer wall of the end of the housing 1 through which the cable 3 passes is provided with a plurality of deformation grooves 11, the length direction of the plurality of deformation grooves 11 is perpendicular to the length direction of the cable 3, the length of the plurality of deformation grooves 11 is less than the circumference of the end of the housing 1, the plurality of deformation grooves 11 are divided into multiple columns and distributed around the axis of the end of the housing 1, and the deformation grooves 11 between adjacent columns are mutually displaced. Such a design can improve the bending ability of the portion where the housing 1 and the cable 3 are connected, thereby delaying the phenomenon that the cable 3 is easy to break when bent relative to the housing 1. The two opposite side walls of the housing 1 are provided with finger pressure surfaces 12 recessed into the housing 1. Such a design can provide an effective contact surface for the two fingers used to grasp the housing, improve the comfort between the fingers and the housing 1 and the force effect of grasping. Both finger pressure surfaces 12 are provided with finger pressure strips 13 for increasing friction. Such a design can increase the friction between the fingers and the housing 1, making it easier for the user to hold the plug tightly. Reference Figure 1 As shown, the outer wall of the shell 1 is provided with a finger push surface 14 for external force to push. During use, the user holds the shell 1 with the thumb and middle finger, and presses the finger push surface 14 with the index finger to push the plug. Such a design can improve the comfort between the index finger and the shell 1, and at the same time improve the efficiency of pushing the plug into the socket.

[0026] The housing 1 and the panel 2 are assembled as one body, the housing 3 is penetrated by a cable 3, and the panel 2 is inserted with three pins 4. The cable 3 is composed of a power harness 31 and a signal harness 32, the power harness 31 is electrically connected to the pin 4, the signal harness 32 is electrically connected to the temperature control circuit board 5, and the three pins 4 are respectively the L pin corresponding to the live wire, the N pin corresponding to the neutral wire, and the protective pin corresponding to the ground. The cable 3 includes three power harnesses 31 respectively connected to the L pin, the N pin and the protective pin, and a signal harness 32 that can be connected to the temperature control circuit board 5.

[0027] The temperature control circuit board 5 integrates multiple electronic components and a temperature sensing probe 52 that can contact the heat conductive block 6. The temperature sensing probe adopts a thermistor (NTC). There are two temperature control probes, which respectively detect the pin temperatures of the live wire and the neutral wire. The temperature control circuit board 5 is provided with an avoidance hole 54, which allows the pin 4 to pass through but not contact. The heat conductive block 6 is provided with two heat conductive parts 61 that can contact one end of the L pin and the N pin respectively. The heat conductive parts are designed as through holes or notches. The heat conductive parts 61 are for the pin 4 to pass through. The pin 4 needs to be in close contact with the heat conductive part 61 to ensure accurate heat transfer.

[0028] The end surface of the panel 2 facing the inside of the housing 1 is integrally formed with three buckle feet 23 that are geometrically distributed and have elastic deformation capabilities. The cover 7 is in the shape of a cover and its outer contour is a rectangular parallelepiped. The three side walls of the cover 7 are processed with buckle grooves 72 for the buckle feet to buckle in. The cover 7 is provided with a through hole for the signal harness 32 to pass through and a wire groove 71 that is similar to the contour of the heat conducting part 61 and partially accommodates the power harness 31. Compared with the design in which the cover 7 is buckled with the panel 2, the design in which the temperature control circuit board 5 and the heat conducting block 6 are successively positioned on the panel 2 by screws can simplify the assembly steps and improve production efficiency. At the same time, the efficiency of disassembly and assembly of the heat conducting block 6 and the temperature control circuit board 5 can be improved during future maintenance, thereby improving maintenance efficiency.

[0029] During the assembly process, the temperature control circuit board 5 is first installed in the rectangular area where the three buckle feet are located, and then the heat conductive block 6 is stacked on the temperature control circuit board 5, and the temperature sensing probe 52 is in contact with the heat conductive block 6. Then, the three buckle grooves of the cover 7 correspond to the three buckle feet respectively and cover the panel 2, and the three buckle grooves and the three buckle feet are buckled respectively. The temperature control circuit board 5 and the heat conductive block 6 are both enclosed in the inner cavity formed by the cover 7 and the inner side of the panel 2, and then the three pins 4 are positioned on the panel 2, and the protective foot passes through one end of the panel 2 and does not interfere with the cover 7. The L pin and the N pin pass through one end of the panel 2 and pass through the corresponding heat conductive part 61 and the wire groove 71. The cable 3 is inserted into the shell 1, and one end of the three power harnesses 31 in the cable 3 is electrically connected to the three pins 4 respectively, and one end of the signal harness 32 passes through the cover 7 and is electrically connected to the temperature control circuit board 5. Finally, the panel 2 is moved toward the port of the shell 1 and fixedly connected to the port of the shell 1, and the cover 7, the heat conductive block 6 and the temperature control circuit board 5 are all limited to the inside of the shell 1. During the use of the electric vehicle temperature control plug, the heat generated by the L pin and the N pin will be transferred to the heat conductive block 6. The temperature sensing probe 52 measures the temperature of the heat conductive block 6 in real time and transmits it to the controller external to the cable 3 through the temperature control circuit board 5 and the signal harness 32. The user can adjust the charging status according to the display or alarm of the controller.

[0030] Compared with the prior art design without over-temperature protection, such a design can monitor the temperature of the plug in the charging state in real time, so that charging can be cut off in time when overheating occurs, avoiding fire or plug damage. The heat conductive block 6 transfers the heat of the pin 4 to the temperature sensing probe 52, and can also dissipate the heat to the internal space of the shell to timely reduce the heat of the pin 4, thereby ensuring the stability of the pin 4 structure and the stability of power transmission; the design of the heat conductive part 61 can increase the contact area with the corresponding outer wall of the pin 4, thereby increasing the heat transferred from the pin 4 to the heat conductive block 6, reducing the heat dissipated from the pin 4 to the air, and further improving the accuracy of the temperature measured by the temperature sensing probe 52 to the heat conductive block 6, so that the user can make a timely decision.

[0031] Because the outer contour size of the temperature control circuit board 5 is smaller than the outer contour size of the cover 7, when the cover 7 is not installed, the temperature control circuit board 5 slides relative to the panel 2, which makes the cover 7 easily interfered by the temperature control circuit board 5 when installed, and the assembly efficiency is reduced. In order to solve the above problem, refer to Figure 3 and Figure 4 As shown, a positioning hole 51 is opened on the temperature control circuit board 5, and a positioning column 21 which can be inserted into the positioning hole 51 is integrally formed on the panel 2. By inserting the positioning column 21 into the positioning hole 51, the temperature control circuit board 5 cannot move relative to the panel 2. Such a design can ensure the fixation of the temperature control circuit board 5 on the panel 2, so that the subsequent cover 7 can smoothly cover the outside of the temperature control circuit board 5.

[0032] Because the outer contour size of the heat conducting block 6 is smaller than that of the cover 7, when the cover 7 is not installed, the heat conducting block 6 slides relative to the temperature control circuit board 5, which makes the cover 7 easily interfered by the heat conducting block 6 when installed, and the assembly efficiency is reduced. In order to solve the above problem, refer to Figure 3 and Figure 4 As shown, the temperature control circuit board 5 is provided with a connecting hole 53, the panel 2 is provided with a connecting groove 22 for accommodating one end of the connecting bolt 63, and a threaded groove is provided on the surface of the heat conductive block 6 facing the temperature control circuit board 5. The threaded part of the connecting bolt 63 is passed through the connecting hole 53 and screwed into the heat conductive block 6 so that the heat conductive block 6 and the temperature control circuit board 5 are connected together. Then, the temperature control circuit board 5 and the heat conductive block 6 are placed as a whole on the panel 22, and one end of the connecting bolt 63 is inserted into the connecting groove 22. Such a design can connect the heat conductive block 6 and the temperature control circuit board 5 together and can be disassembled and assembled relative to the panel 2 as a whole. At the same time, it can ensure that the temperature sensing probe 52 is always in contact with the heat conductive block 6 to ensure heat transfer.

[0033] Reference Figure 3 and Figure 4As shown, a groove 62 is provided on the surface of the heat conductive block 6 facing the temperature control circuit board 5, and the temperature sensing probe 52 of the temperature control circuit board 5 can be inserted into the groove 62. The groove 62 can store heat and dissipate it, thereby improving the accuracy of the temperature detected by the temperature sensing probe 52. At the same time, the temperature sensing probe 52 is plugged into the groove 62 so that the subsequent connecting bolt 63 can smoothly pass through the connecting hole 53 and be screwed into the heat conductive block 6.

[0034] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A temperature control plug for an electric vehicle, comprising a housing (1), a panel (2) connected to the housing (1), a cable (3) with one end extending out of the housing (1), and a pin (4) extending through the panel (2), wherein the cable (3) is provided with a power harness (31) electrically connected to the pin (4), and characterized in that: A heat conducting block (6) and a temperature sensing probe (52) located in the shell (1) are arranged on the inner side of the panel (2), and the temperature sensing probe (52) contacts the heat conducting block (6); the heat conducting block (6) is provided with a heat conducting portion (61) in contact with one end of the pin (4) located in the shell (1), and the heat generated by the pin (4) is transferred to the temperature sensing probe (52) through the heat conducting block (6) so that the temperature sensing probe (52) can monitor the temperature of the heat conducting block (6).

2. The electric vehicle temperature control plug according to claim 1, characterized in that: A temperature control circuit board (5) located in the shell (1) is arranged on the inner side of the panel (2), a temperature sensing probe (52) is integrated in the temperature control circuit board (5), and the temperature control circuit board (5) and the heat conducting block (6) are stacked on each other; the cable (3) also includes a signal wire harness (32) connected to the temperature control circuit board (5), and the signal wire harness is electrically connected to the temperature control circuit board.

3. The electric vehicle temperature control plug according to claim 2, characterized in that: The panel (2) is snap-connected with a cover (7) covering the outside of the temperature control circuit board (5) and the heat conduction block (6); one end of the signal harness (32) connected to the temperature control circuit board (5) passes through the cover (7); and the cover (7) is provided with a wire groove (71) having a similar contour to the heat conduction part (61) and partially accommodating the power harness (31).

4. The electric vehicle temperature control plug according to claim 2, characterized in that: The temperature control circuit board (5) is provided with a positioning hole (51), and the panel (2) is provided with a positioning column (21) capable of being inserted into the positioning hole (51).

5. The electric vehicle temperature control plug according to claim 2, characterized in that: The temperature control circuit board (5) is provided with a connection hole (53), the heat conducting block (6) is connected with a connection bolt (63) that can partially penetrate the connection hole (53), and the panel (2) is provided with a connection groove (22) for accommodating one end of the connection bolt (63).

6. The electric vehicle temperature control plug according to claim 2, characterized in that: The surface of the heat conducting block (6) facing the temperature control circuit board (5) is provided with a groove (62) for accommodating a temperature sensing probe (52).

7. The electric vehicle temperature control plug according to claim 2, characterized in that: The outer wall of the end of the shell (1) through which the cable (3) passes is provided with a plurality of deformation grooves (11), and the length directions of the plurality of deformation grooves (11) are perpendicular to the length direction of the cable (3).

8. The electric vehicle temperature control plug according to claim 2, characterized in that: The two opposite side walls of the shell (1) are both provided with finger pressure surfaces (12) recessed into the shell (1).

9. The electric vehicle temperature control plug according to claim 8, characterized in that: Both of the two finger pressure surfaces (12) are provided with finger pressure strips (13) for increasing friction.

10. The electric vehicle temperature control plug according to claim 2, characterized in that: The outer wall of the housing (1) is provided with a finger-pushing surface (14) for external force to push.

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