Load protection device in work of electric vehicle charging pile

Abstract

The utility model discloses a load protection device in work of an electric vehicle charging pile, which comprises a safety protection system embedded in a charging pile body, a jacking structure arranged on a charging gun and a cooling structure arranged between a shell of the charging pile body and a power supply element, the ejection structure comprises a push block movably installed at the charging head end of the charging gun and a screw penetrating through the interior of the charging gun, a main gear and an auxiliary gear which are meshed with each other are further rotationally installed in the charging gun through a bearing seat, the end of the auxiliary gear is connected with a motor, and the screw is in threaded connection with the main gear; the safety protection system comprises a main control unit, a plurality of sub-control modules, a plurality of current detection modules and a plurality of temperature detection modules. When the load of the charging output circuit is detected to be too large, the jacking structure is controlled to eject the charging gun out, so that the charging gun is separated from the charging port of the electric vehicle, and when the monitored temperature is too high, the cooling structure is started to work to help the power supply element to rapidly dissipate heat and cool.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle charging, in particular to a load protection device in the operation of an electric vehicle charging pile. Background Art

[0002] With the popularization of new energy electric vehicles, charging piles have also been widely used as important supporting facilities for electric vehicles. Current electric vehicle charging piles generally include: a charging pile shell, power supply components inside the charging pile, and multiple charging guns connected by charging cables.

[0003] During the charging process, the charging load may increase abnormally due to battery aging, charging line failure and other reasons, which may lead to safety problems such as overheating, short circuit and even fire of the charging pile. However, it is difficult for existing charging piles to detect abnormal increase in charging load and excessive temperature in time, making it inconvenient to adjust the load or cut off the charging line in time to protect the car.

[0004] To this end, we propose a load protection device for electric vehicle charging piles to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a load protection device for an electric vehicle charging pile in operation, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A load protection device for an electric vehicle charging pile at work, comprising a safety protection system embedded in the charging pile body, a top-opening structure installed on a charging gun, and a cooling structure installed between the charging pile body shell and a power supply element, wherein the top-opening structure comprises a push block movably installed on the charging head end of the charging gun and a screw rod penetrating the inside of the charging gun, wherein a main gear and a sub-gear meshing with each other are rotatably installed in the inside of the charging gun through a bearing seat, and a motor is connected to the end of the sub-gear, the screw rod is threadedly connected to the main gear, and a limiting cylinder is sleeved on one end of the screw rod away from the push block;

[0008] The safety protection system includes a main control unit, several sub-control modules, and several current detection modules and temperature detection modules, which are used to monitor the charging output circuit of the charging gun;

[0009] The cooling structure comprises a cooling jacket and a refrigeration box which are interconnected. The liquid inlet of the cooling jacket is connected to the refrigeration box via a water pump and a liquid inlet pipe, and the liquid outlet of the cooling jacket is connected to the refrigeration box via a liquid return pipe.

[0010] In a further embodiment, the push block adopts a conical structure, and the outer diameter of one end of the push block close to the charging gun is smaller than the outer diameter of the other end.

[0011] In a further embodiment, the inner ring surface of the limiting cylinder is provided with ridges parallel to the axial direction of the limiting cylinder, and the surface of the screw is provided with grooves matching the ridges.

[0012] In a further embodiment, a piston is installed at one end of the screw extending into the limiting cylinder, the outer circumferential side of the piston is tightly fitted with the inner wall of the limiting cylinder, and an air passage is connected inside the screw, the piston and the push block.

[0013] In a further embodiment, a plurality of cooling strips are evenly distributed on the cooling jacket, the cooling strips are hollow inside and communicated with the cooling jacket, and heat dissipation grooves are provided between adjacent cooling strips.

[0014] In a further embodiment, a semiconductor refrigeration plate and a temperature sensor are also installed on the outer shell of the refrigeration box, and the cooling surface of the semiconductor refrigeration plate and the temperature sensing probe of the temperature sensor both penetrate the outer shell of the refrigeration box and contact the cooling water in the refrigeration box.

[0015] In a further embodiment, the main control unit has a built-in power distribution module, which dynamically adjusts the power distribution of each charging output circuit according to the current value detected by the current detection module. The sub-control module, current detection module and temperature detection module correspond one-to-one to the charging output circuit of the charging gun respectively. The sub-control module is used to receive instructions from the main control unit and realize power distribution by adjusting the parameters of the charging output circuit. The current detection module and temperature detection module are used to monitor the current value and temperature value of the charging output circuit respectively.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model can timely monitor the current value and temperature value of the charging output circuit by setting a safety protection system, so as to timely monitor the load and temperature changes. When the load is too large, the safety protection system can control the motor in the top-opening structure to drive the secondary gear to rotate in conjunction with the main gear, so as to utilize the thread action to control the movement of the screw to push out the push block, so that the charging gun can be disengaged from the charging port of the electric vehicle, and the charging path between the electric vehicle and the charging pile can be disconnected in time. At the same time, when the monitored temperature is too high, the cooling structure can be started to help the power supply component to quickly dissipate heat and cool down. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the back shell of the utility model after partial cutaway;

[0020] Figure 3This is a schematic diagram of the structure of the charging gun of the utility model;

[0021] Figure 4 It is a schematic diagram of the installation structure of the charging gun housing of the utility model after partial sectioning and the top opening structure;

[0022] Figure 5 This is a semi-sectional structural schematic diagram of the top-opening structure of the utility model;

[0023] Figure 6 This is the framework diagram of the safety protection system of the utility model;

[0024] Figure 7 This is a schematic diagram of the cooling structure of the utility model.

[0025] In the figure: 1. Charging pile body; 2. Charging gun; 3. Safety protection system; 4. Push block; 5. Screw; 51. Groove; 6. Main gear; 7. Limit cylinder; 71. Protruding ridge; 8. Sub-gear; 9. Motor; 10. Piston; 11. Air duct; 12. Cooling jacket; 121. Cooling strip; 122. Heat sink; 13. Refrigeration box; 131. Semiconductor refrigeration sheet; 132. Temperature sensor; 14. Water pump; 15. Liquid inlet pipe; 16. Liquid return pipe; 17. Power supply element. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood by specific circumstances.

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1 and Figure 6 A load protection device for an electric vehicle charging pile comprises a safety protection system 3 installed in a charging pile body 1. The safety protection system 3 comprises a main control unit, a plurality of sub-control modules, and a plurality of current detection modules and a temperature detection module, which are used to monitor the charging output circuit of a charging gun 2. The main control unit has a built-in power distribution module, which dynamically adjusts the power distribution of each charging output circuit according to the current value detected by the current detection module. The sub-control module, the current detection module, and the temperature detection module correspond to the charging output circuit of the charging gun 2 one by one, respectively. The sub-control module is used to receive instructions from the main control unit and realize power distribution by adjusting the parameters of the charging output circuit. The current detection module and the temperature detection module are used to monitor the current value and temperature value of the charging output circuit, respectively, so as to dynamically monitor the load and temperature of the charging output circuit of the charging gun 2.

[0030] See also Figure 3-4 The load protection device also includes a top-opening structure installed on the charging gun 2, the top-opening structure includes a push block 4 and a screw 5 that movably penetrates the charging head end housing of the charging gun 2, the push block 4 is installed at the end of the screw 5 that extends out of the charging head end housing, and the interior of the charging gun 2 is also rotatably installed with a main gear 6 and a sub-gear 8 that mesh with each other through a bearing seat, and the end of the sub-gear 8 is connected to a motor 9, and the motor 9 is electrically connected to the main control unit of the safety protection system 3, so that when the load is too large and the temperature is too high, the safety protection system 3 automatically controls the motor 9 to start working, the motor 9 drives the sub-gear 8 to rotate, and the sub-gear 8 drives the main gear 6 to rotate, the screw 5 penetrates the inside of the main gear 6, and the screw 5 and the main gear 6 are threadedly connected, so that when the main gear 6 rotates, the screw 5 can move axially under the action of the thread, in order to prevent the screw 5 from rotating with the main gear 6, a limit cylinder 7 is set at one end of the screw 5 away from the push block 4, and the limit cylinder 7 is fixed to the charging head end housing to limit the rotation of the screw 5.

[0031] See also Figure 5Furthermore, the inner ring surface of the limiting cylinder 7 is provided with a ridge 71 which is parallel to the axial direction of the limiting cylinder 7, and the surface of the screw 5 is provided with a groove 51 which matches the ridge 71, so that the ridge 71 is embedded in the groove 51. When the screw 5 moves, the ridge 71 slides in the groove 51, thereby ensuring the limiting effect of the limiting cylinder 7 on the screw 5.

[0032] See also Figure 5 In order to facilitate the use of the push block 4, it is hidden in the shell of the charging head end in daily state and will not protrude from the shell of the charging head end. The push block 4 is set to adopt a conical structure, and the outer diameter of one end of the push block 4 close to the charging gun 2 is smaller than the outer diameter of the other end, so that when the push block 4 retracts into the shell, the smaller end of the push block 4 can be buckled into the shell first, so as to facilitate quick alignment.

[0033] See also Figure 5 In order to prevent the charging gun 2 from falling when the charging gun 2 is disconnected from the charging port of the electric vehicle, a piston 10 is installed at one end of the screw 5 extending into the limiting cylinder 7. The outer circumferential side of the piston 10 is tightly fitted with the inner wall of the limiting cylinder 7, and an air channel 11 is passed through the screw 5, the piston 10 and the push block 4. During charging, the push block 4 contacts the outer frame of the charging port of the electric vehicle, and when the screw 5 extends and moves, it drives the piston 10 to move. At this time, the pressure in the limiting cylinder 7 becomes smaller, and a negative pressure suction port is formed on the surface of the push block 4 by using the air channel 11, so that although the charging gun 2 is disconnected from the charging port of the electric vehicle, the push block 4 is adsorbed on the outer frame of the charging port of the electric vehicle, so that the charging gun 2 will not slip from the charging port, which is beneficial to protecting the safety of the charging gun 2. In order to improve the adsorption effect, the push block 4 can be made of rubber or silicone.

[0034] See also Figure 2 and Figure 7 The load protection device also includes a cooling structure, which is installed between the shell of the charging pile body 1 and the power supply element 17, and is used to accelerate the heat dissipation and cooling of the power supply element 17. The cooling structure includes a cooling jacket 12 and a refrigeration box 13 that are interconnected. The cooling jacket 12 is connected to the upper surface of the refrigeration box 13, and the refrigeration box 13 is fixed to the inner bottom of the charging pile body 1. The liquid inlet of the cooling jacket 12 is connected to the refrigeration box 13 through a water pump 14 and a liquid inlet pipe 15, and the liquid outlet of the cooling jacket 12 is connected to the refrigeration box 13 through a liquid return pipe 16, so as to realize the cooling water circulation between the cooling jacket 12 and the refrigeration box 13. At the same time, in order to ensure a more sufficient circulation of the cooling water, the liquid inlet position of the cooling jacket 12 is set lower and the liquid outlet position of the cooling jacket 12 is set higher.

[0035] See also Figure 7In order to prevent the power supply element 17 from being completely wrapped and affecting the normal heat dissipation of the power supply element 17, a plurality of cooling strips 121 are evenly distributed on the cooling jacket 12. The cooling strips 121 are hollow inside and connected to the cooling jacket 12. Heat dissipation grooves 122 are provided between adjacent cooling strips 121, so that the power supply element 17 can actively dissipate heat outwards through the heat dissipation grooves 122, and the cooling strips 121 can help the power supply element 17 to passively dissipate heat.

[0036] See also Figure 7 In order to ensure the cooling effect of the cooling water in the refrigeration box 13, a semiconductor refrigeration plate 131 and a temperature sensor 132 are also installed on the outer shell of the refrigeration box 13. The cooling surface of the semiconductor refrigeration plate 131 and the temperature sensing probe of the temperature sensor 132 both penetrate the outer shell of the refrigeration box 13 and contact the cooling water in the refrigeration box 13. The semiconductor refrigeration plate 131 is used to cool and cool the cooling water to prevent the temperature from rising due to long-term circulation and reducing the cooling effect. The temperature sensor 132 can detect the temperature of the cooling water to avoid the temperature being too high to achieve the cooling effect, and to avoid the temperature being too low to cause the surface of the cooling jacket 12 to liquefy.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A load protection device for an electric vehicle charging pile, characterized in that: The invention comprises a safety protection system (3) embedded in a charging pile body (1), a top opening structure installed on a charging gun (2), and a cooling structure installed between a shell of the charging pile body (1) and a power supply element (17), wherein the top opening structure comprises a push block (4) movably installed on a charging head end of the charging gun (2) and a screw rod (5) penetrating the interior of the charging gun (2), wherein a main gear (6) and a sub gear (8) meshing with each other are rotatably installed in the interior of the charging gun (2) through a bearing seat, and a motor (9) is connected to the end of the sub gear (8), the screw rod (5) is threadedly connected to the main gear (6), and the end of the screw rod (5) away from the push block (4) is sleeved with a limiting cylinder (7); The safety protection system (3) comprises a main control unit, a plurality of sub-control modules, and a plurality of current detection modules and temperature detection modules, and is used to monitor the charging output circuit of the charging gun (2); The cooling structure comprises a cooling jacket (12) and a refrigeration box (13) which are interconnected, wherein the liquid inlet of the cooling jacket (12) and the refrigeration box (13) are connected via a water pump (14) and a liquid inlet pipe (15), and the liquid outlet of the cooling jacket (12) and the refrigeration box (13) are connected via a liquid return pipe (16).

2. The load protection device for an electric vehicle charging pile according to claim 1, characterized in that: The push block (4) adopts a conical structure, and the outer diameter of one end of the push block (4) close to the charging gun (2) is smaller than the outer diameter of the other end.

3. The load protection device for an electric vehicle charging pile according to claim 1, characterized in that: The inner ring surface of the limiting cylinder (7) is provided with a convex ridge (71) parallel to the axial direction of the limiting cylinder (7), and the surface of the screw rod (5) is provided with a groove (51) matching the convex ridge (71).

4. The load protection device for an electric vehicle charging pile according to claim 1, characterized in that: A piston (10) is installed at one end of the screw rod (5) extending into the limiting cylinder (7), the outer circumferential side surface of the piston (10) is tightly fitted with the inner wall of the limiting cylinder (7), and an air passage (11) is connected inside the screw rod (5), the piston (10) and the push block (4).

5. The load protection device for an electric vehicle charging pile according to claim 1, characterized in that: A plurality of cooling strips (121) are evenly distributed on the cooling jacket (12); the cooling strips (121) are hollow inside and communicate with the cooling jacket (12); and heat dissipation grooves (122) are provided between adjacent cooling strips (121).

6. The load protection device for an electric vehicle charging pile according to claim 1, characterized in that: A semiconductor refrigeration sheet (131) and a temperature sensor (132) are also mounted on the outer shell of the refrigeration box (13); the refrigeration surface of the semiconductor refrigeration sheet (131) and the temperature sensing probe of the temperature sensor (132) both penetrate the outer shell of the refrigeration box (13) and are in contact with cooling water in the refrigeration box (13).

7. The load protection device for an electric vehicle charging pile in operation according to claim 1, characterized in that: The main control unit has a built-in power distribution module, which dynamically adjusts the power distribution of each charging output circuit according to the current value detected by the current detection module. The sub-control module, the current detection module and the temperature detection module correspond to the charging output circuits of the charging gun (2) one by one. The sub-control module is used to receive instructions from the main control unit and to achieve power distribution by adjusting the parameters of the charging output circuit. The current detection module and the temperature detection module are used to monitor the current value and the temperature value of the charging output circuit respectively.

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