Charging pile and charging control method

Abstract

The invention provides a charging pile and a charging control method.The charging pile comprises a charging unit, a heat dissipation device and a conversion module, the input end of the conversion module is connected with a first connecting line through a second connecting line, the output end of the conversion module is connected with the heat dissipation device, and the heat dissipation device comprises a box body, a heat storage plate and a magnetic plate; the heat storage plate and the magnetic plate are located in the box body and arranged in a spaced mode, and magnetic field applying modules are arranged on the two sides of the box body and used for periodically applying a magnetic field to the magnetic plate and removing the magnetic field; and the magnetic plates can periodically and alternately contact with the heat storage plates which are adjacently arranged on the two sides so as to conduct heat outwards and dissipate heat of the charging unit. According to the charging pile, heat generated by the charging unit can be carried out of the shell through the heat dissipation device to achieve heat dissipation, air convection does not exist at the moment, humidity and dust particles of the external environment do not enter the shell, and operation of the charging pile is stable and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to a charging pile and a charging control method. Background Art

[0002] With the rapid development of technology, electric vehicles account for an increasingly higher share of vehicles. At present, electric vehicles use batteries to provide power to the drive motor, which converts the power of the power supply into mechanical energy, and then drives the wheels and working devices through the transmission device or directly. Electric vehicles need charging piles for charging. In this process, the charging unit that converts AC to DC is often the largest source of heat for the charging pile. In order to ensure the normal operation and safety of the charging pile, the charging module needs to be cooled in time.

[0003] Traditional charging piles mostly use air cooling, that is, heat exchange is performed through air to passively achieve the cooling effect. In high-power charging piles, especially charging piles that increase the charging current, it is difficult to achieve the cooling effect through the air cooling mode. For this reason, the Chinese patent application number 201610864226.5 is an early patent of the applicant, which discloses a charging pile, including a pile body, a display module, a control module, a charging circuit module, a charging module and a charging plug. The pile body includes a heat dissipation cabinet, including a heating element accommodating part, a refrigerant heat dissipating part and an air cooling part; the refrigerant heat dissipating part is located below the heating element accommodating part, and the air cooling part is located above the refrigerant heat dissipating part; the heating element accommodating part is used to place the main heating circuit of the charging pile; the refrigerant heat dissipating part is used to place the main cooling device that provides a cold source to the heating element accommodating part; the air cooling part is used to place an air cooling device that cools the air. This solution cools the heating circuit by combining air cooling, liquid cooling and spray cooling, and has a good heat dissipation effect; but its structure is relatively complex and difficult to manufacture. Summary of the invention

[0004] In view of this, the present invention aims to propose a charging pile and a charging control method to solve the problems of poor heat dissipation, high operating noise and high energy consumption during the heat dissipation of the charging pile in the prior art.

[0005] The present invention provides a charging pile, including a charging unit, wherein the output end of the charging unit is respectively connected to a charging gun and an AC power supply through a first connecting line, the charging pile also includes a heat dissipation device and a conversion module, the input end of the conversion module is connected to the first connecting line through a second connecting line, and the output end of the conversion module is connected to the heat dissipation device, the heat dissipation device includes a box, a heat storage plate, and a magnetic plate, the heat storage plate and the magnetic plate are located in the box and are spaced apart from each other, magnetic field application modules are arranged on both sides of the box, which are used to periodically apply a magnetic field to and remove the magnetic field from the magnetic plate; the magnetic plate can periodically and alternately contact the heat storage plates arranged adjacent to each other on both sides to conduct heat to the outside and dissipate heat from the charging unit.

[0006] Preferably, the first connecting line is provided with a first switch, the connection point between the second connecting line and the first connecting line is located between the first switch and the conversion module, and the second connecting line is provided with a second switch.

[0007] Preferably, the charging pile further includes a fan assembly, a third switch is arranged between the fan assembly and the conversion module, a fourth switch is arranged between the heat dissipation device and the conversion module, and the fan assembly and the heat dissipation device are arranged in parallel.

[0008] Preferably, the box body is made of non-heat-conducting material and a heat-insulating layer is arranged on the outer surface of the box body, a power unit is arranged on the outside of the box body, and the output end of the power unit is drivingly connected to the magnetic plate through a heat-insulating connecting rod, so as to drive the magnetic plate to rotate forward or reversely and selectively contact one of the heat storage plates on the adjacent two sides.

[0009] Preferably, the magnetic plate includes a first end plate and a second end plate which are arranged opposite to each other, and an assembly hole is arranged between the first end plate and the second end plate for transmission connection with the thermal insulation connecting rod, and the projection lengths of the first end plate and the second end plate on the horizontal plane are L1 and L2 respectively, wherein L1<L2.

[0010] Preferably, a connected second side wall surface and a third side wall surface are respectively arranged on both sides of the second end plate, and the third side wall surface is arranged close to the first end plate. The planes where the two second side wall surfaces are arranged opposite to each other form an angle α1, and the planes where the two third side wall surfaces are arranged opposite to each other form an angle α2, wherein α1<α2.

[0011] Preferably, the thermal insulation connecting rod includes a first connecting part and a second connecting part, and the first connecting part is provided with a first plug hole at an end away from the second connecting part for connecting the rotating shaft of the power unit; the second connecting part can be inserted into the assembly hole of the magnetic plate to drive it to rotate as a whole.

[0012] The present invention provides a charging control method for a charging pile, comprising: S1, obtaining a charging start signal, closing a first switch, and performing a normal charging process; S2, detecting the temperature T1 of a charging unit in real time;

[0013] S3, determine whether T1 is greater than the first preset value K1, if so, proceed to step S4; if not, return to step S2; S4, determine whether T1 is greater than the set value K max If so, close the second switch and the third switch, keep the fourth switch open, and dissipate the heat of the charging unit through the fan assembly; if not, go to step S5; S5, close the second switch and the fourth switch, keep the third switch open, and dissipate the heat of the charging unit through the heat dissipation device.

[0014] Preferably, step S3 includes: S31, real-time detection of external ambient temperature T2; S32, judging whether T2 is less than the first temperature value X1; if so, proceeding to step S34; if not, proceeding to step S33; S33, judging whether T2 is greater than the second temperature value X2; if so, directly proceeding to step S4; if not, proceeding to step S36; S34, judging whether T1 is greater than K1; if so, proceeding to step S35; if not, returning to step S2; S35, judging whether the temperature increase of T1 per unit time is greater than the second preset value K2, or whether T1 is greater than the third preset value K3; if so, proceeding to step S4; if not, returning to step S2; S36, judging whether T1 is greater than K1 and the sum of T1 and T2 is greater than the fourth preset value K4; if so, proceeding to step S4; if not, returning to step S2.

[0015] Compared with the prior art, the charging pile and charging control method described in the present invention have the following beneficial effects: 1) The heat dissipation device is used to "transfer" the heat generated by the charging unit to the outside of the shell to achieve heat dissipation. During the whole process, only the magnetic plate rotates periodically and the magnetic field application unit provides the magnetic field intermittently. The noise is small and no air convection occurs at this time. The humidity and dust particles in the external environment will not enter the shell, and the operation of the charging pile is stable and reliable; 2) The use frequency and duration of the fan assembly can be significantly reduced by processing different situations according to the detected temperature of the heat dissipation unit. The fan assembly is started only under special conditions to ensure the safety of the charging pile operation; 3) Through multi-condition analysis, unnecessary startup of the heat dissipation device at low ambient temperature can be avoided, and frequent start and stop of the heat dissipation device can be effectively avoided, which is also conducive to improving the accuracy of the heat dissipation regulation of the charging unit by the charging pile during the charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the internal structure of the charging pile according to Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the overall structure of the heat dissipation device described in Example 1 of the present invention;

[0019] Figure 3 This is a schematic cross-sectional view of the heat dissipation device according to Embodiment 1 of the present invention;

[0020] Figure 4 It is a longitudinal cross-sectional schematic diagram of the heat dissipation device according to Embodiment 1 of the present invention;

[0021] Figure 5This is a schematic structural diagram of the magnetic plate described in Example 1 of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the heat-insulating connecting rod according to Example 1 of the present invention.

[0023] Figure 7 It is a cross-sectional schematic diagram of the ball assembly described in Example 1 of the present invention;

[0024] Figure 8 This is an exploded schematic diagram of the ball assembly described in Example 1 of the present invention;

[0025] Fig. 9 This is a circuit diagram of a charging pile described in Example 2 of the present invention.

[0026] Description of reference numerals:

[0027] 10-housing; 1-CPU; 2-charging unit; 21-rectifier module; 22-power change module; 3-charging gun; 4-heat dissipation device; 41-box; 411-bottom plate; 412-insulation layer; 42-magnetic field application module; 43-heat storage plate; 44-magnetic plate; 441-first end plate; 4411-first side wall; 442-second end plate; 4421-second side wall; 4422-third side wall; 443-assembly hole; 45-heat conduction plate; 46-heat dissipation plate; 47-power unit; 48-insulation connecting rod; 481-first connecting rod part; 482-second connecting part; 483-first limiting boss; 484-first plug-in hole; 49-ball assembly; 491-base; 4911-accommodating chamber; 4912-reinforcing rib; 4913-buckle; 4914-limiting block; 492-ball; 493-upper cover; 4931-installation groove; 4932-avoidance hole; 4933-limiting notch; 5-blower assembly; 6-conversion module; 7, first connecting line; 71, first switch; 8, second connecting line; 81, second switch; 82-third switch; 9, third connecting line; 91-fourth switch. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Under the premise of different conflicts, the technical features of the embodiments of the present invention can be combined with each other.

[0029] It should be noted that all the terms used in the present invention for directional and positional indications, such as "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "top", "low", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection status between the components in a certain state (as shown in the accompanying drawings), and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features.

[0030] In the description of the present invention, 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; 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 invention can be understood according to specific circumstances.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0032] In recent years, charging piles for charging electric vehicles have developed rapidly. The charging unit 2 of the charging pile generates heat during the charging process. If it is not dissipated in time, it will affect the operating stability of the central processor 1 and even cause fire hazards. For this reason, air cooling or water cooling is usually used to dissipate heat and cool it down, but the operating power of air cooling is large and the heat dissipation effect is not good, while the hardware structure of other methods is complex, resulting in high production costs and is not conducive to industrialization.

[0033] By utilizing the magnetocaloric effect (MCE) of magnetic materials and completing periodic magnetic phase changes under the action of a magnetic field, efficient cooling and heat dissipation can be achieved at low energy consumption. The specific working principle is: when the magnetic material is magnetized, the magnetic moment order increases, resulting in a decrease in magnetic entropy and an increase in temperature, thereby releasing heat to the outside world; and when the magnetic material is demagnetized, the magnetic moment order decreases, resulting in an increase in magnetic entropy and a decrease in temperature, and absorbing heat from the outside world. Due to its high efficiency and energy saving, green environmental protection, and easy miniaturization, the use of magnetic refrigeration technology to dissipate heat from charging piles has broad application prospects. To this end, the applicant proposes the following technical solution:

[0034] Example 1

[0035] like Figure 1-8 As shown, a charging pile comprises a shell 10, in which a central processing unit 1 and a charging unit 2 are connected, and the output end of the charging unit 2 is connected to a charging gun 3 for charging a battery module; a heat dissipation device 4 is arranged on one side of the charging unit 2, and the heat dissipation device 4 is located outside the shell 10 on a side away from the charging unit 2, and is used to dissipate heat for the charging unit 2 and / or the central processing unit 1; the heat dissipation device 4 comprises a box 41, a heat storage plate 43, and a magnetic plate 44, and the heat storage plate 43 and the magnetic plate 44 are located in the box 41 and are arranged at intervals from each other, and magnetic field application modules 42 are arranged on both sides of the box 41, which are used to periodically apply and remove magnetic fields to the magnetic plates 44; the magnetic plates 44 can periodically contact the heat storage plates 43 arranged adjacent to each other on both sides to conduct heat outward.

[0036] Specifically, when the magnetic field applying module 42 applies the magnetic field to the magnetic plate 44, the temperature of the magnetic plate 44 increases due to the magnetocaloric effect and is in a heating state. At this time, the magnetic plate 44 selectively contacts the heat storage plate 43 on the side away from the charging unit 2 and conducts the heat outward; when the magnetic field applied by the magnetic field applying module 42 is eliminated, the magnetic plate 44 is reduced due to the magnetocaloric effect and produces an endothermic effect. The magnetic plate 44 selectively contacts the heat storage plate 43 on the side close to the charging unit 2 and takes away its heat; as the magnetic plate 44 alternately contacts the heat storage plates 43 on both sides and absorbs and dissipates heat, heat is transferred from the heat storage plate 43 on the side close to the charging unit 2 or the central processor 1 to the heat storage plate 43 on the other side, so that the heat is continuously conducted from the inside of the charging pile to the outside to achieve heat dissipation. Since the charging unit 2 is usually at 40°C-60°C, and may even reach 80°C or higher under normal working conditions, this arrangement enables the heat generated by the charging unit 2 to be "transferred" step by step and successively to the outside of the shell 10 to provide a good heat dissipation effect. The entire process will not generate unnecessary vibration or noise, has a good heat dissipation effect, extremely low energy consumption, and strong market competitiveness.

[0037] As an example of the present invention, the charging pile also includes a fan assembly 5, which is located in the shell 10 and is used to perform air cooling on the central processor 1 and / or the charging unit 2. This setting can be used in conjunction with the heat dissipation device 4 to improve the heat dissipation effect of the charging pile and reduce operating energy consumption. For example, when the temperature of the charging unit 2 is low, the heat dissipation device 4 is used for heat dissipation; when the temperature is higher than the preset value, the fan assembly 5 is turned on for forced air cooling; the heat dissipation device 4 can reduce the temperature rise rate inside the charging pile, and reduce the operating time of the fan assembly 5 to reduce energy consumption; at the same time, the cooperation between the two can reduce the maximum temperature inside the shell 10, and the operation is more stable and reliable. The specific structure and assembly position of the fan assembly 5 are prior art and will not be repeated here.

[0038] As an example of the present invention, the charging unit 2 includes a connected rectifier module 21 and a power change module 22, wherein the rectifier module 21 converts the input alternating current (AC) into direct current (DC) for charging the electric vehicle battery, and the power change module 22 is responsible for adjusting the output voltage and current to accurately match the charging requirements of the electric vehicle battery, and at the same time removes the electrical noise generated during the rectification process through a filter to make the output DC more stable. Its specific structure and assembly relationship are prior art and will not be repeated here. Preferably, the charging unit 2 is provided with a temperature sensor, and the central controller is connected to the temperature sensor for real-time acquisition of the temperature T1 of the charging unit 2. The charging pile can also be provided with an ambient temperature sensor for real-time acquisition of the external ambient temperature.

[0039] Preferably, the box body 41 itself is non-heat-conductive and a heat-insulating layer 412 is provided on the outer surface. This arrangement can ensure that the heat sink 4 is less affected by the ambient temperature, and at the same time, the heat dissipation of the heat sink 4 is mainly heat conduction led by the magnetic plate 44, with less heat convection; ensuring that there is a temperature difference between adjacent heat storage plates 43, and having a good heat dissipation effect inside the charging pile. The box body 41 can be in the shape of a cube, a cuboid or other shapes.

[0040] As an example of the present invention, the magnetic field applying module 42 can be a permanent magnet, which can move along the arrangement direction of the heat storage plate 43 or the magnetic plate 44, so as to apply or remove the magnetic field to the magnetic plate 44; the magnetic field applying module 42 can also be an electromagnet, which applies or removes the magnetic field by controlling the current flowing through the electromagnet. The magnetic plate 44 is made of a material having a magnetocaloric effect, such as Ni2MnGa alloy, GdGeSi-based compound, LaFe13-based compound, or LaFe13H-based compound; the material of the heat storage plate 43 can be a metal such as aluminum, copper, iron or stainless steel, or a non-metallic material such as silicon or carbon, or a ceramic such as aluminum nitride, silicon carbide or aluminum oxide.

[0041] As an example of the present invention, the heat storage plate 43 is a rectangular thin plate and is arranged in sequence. There are multiple magnetic plates 44 and they are spaced apart from the heat storage plate 43. The heat storage plate 43 selectively contacts the magnetic plates 44 on the adjacent two sides by periodic rotation or reciprocating movement, or the magnetic plates 44 selectively contact the heat storage plates 43 on the adjacent two sides by periodic rotation or reciprocating movement to conduct heat outward. The transmission structure of this arrangement is simple, the transmission is stable and reliable, and it is easy to produce and process. The multiple magnetic plates 44 act synchronously with the magnetic field application module 42, or the multiple magnetic plates 44 move periodically in a wave-like manner to conduct heat outward.

[0042] Preferably, a sealing ring is provided on the outer peripheral side of the heat storage plate 43, and the heat storage plate 43 is sealed and connected to the box body. This arrangement can ensure that there is no heat convection in the box body 41, and the whole process will not introduce air into the charging pile, which is conducive to dust prevention and dehumidification.

[0043] Preferably, a power unit 47 is provided at one end of the box body 41, and the output end of the power unit 47 is connected to the magnetic plate 44 through a heat-insulating connecting rod 48, so as to drive the magnetic plate 44 to rotate forward or reversely and selectively contact one of the heat storage plates 43 on the adjacent two sides. This arrangement can prevent the cold or heat of the magnetic plate 44 from being transferred to the power unit 47, thereby ensuring the stable and reliable operation of the power unit 47; the structure is simple, the transmission is stable and reliable, and the production cost is low. As another example of the present invention, each magnetic plate 44 can be driven by a power unit 47 alone, or multiple magnetic plates 44 can be driven by the same power unit 47 through a transmission structure.

[0044] As an example of the present invention, the magnetic plate 44 includes a first end plate 441 and a second end plate 442 which are arranged opposite to each other. An assembly hole 443 is arranged between the first end plate 441 and the second end plate 442 for transmission connection with the heat insulating connecting rod 48. The projection lengths of the first end plate 441 and the second end plate 442 on the horizontal plane are L1 and L2 respectively, wherein L1<L2. This arrangement makes the axis of the magnetic plate 44 close to its center position, ensuring that the force on both ends of the magnetic plate 44 in the length direction is relatively uniform; the rotation of the magnetic plate 44 enables the second end plate 442 to contact the adjacent heat storage plate 43, while the first end plate 441 will not contact the heat storage plate 43 on the other side, ensuring that the magnetic plate 44 contacts the adjacent heat storage plates 43 respectively, and the heat transfer is stable and reliable.

[0045] Preferably, the second side wall surface 4421 and the third side wall surface 4422 are respectively connected on both sides of the second end plate 442, and the third side wall surface 4422 is arranged close to the first end plate 441. The planes where the two second side wall surfaces 4421 are arranged opposite to each other form an angle α1, and the planes where the two third side wall surfaces 4422 are arranged opposite to each other form an angle α2, wherein α1<α2. This arrangement can ensure that the second side wall surface 4421 fits with the side wall surface of the adjacent heat storage plate 43 after the second end plate 442 rotates a certain angle, ensuring that the two are in surface contact, and the heat transfer efficiency is high.

[0046] Preferably, the first end plate 441 includes first side wall surfaces 4411 arranged opposite to each other, and the two first side wall surfaces 4411 are arranged vertically and the planes on which they are located form an angle α3, wherein α1<α3<α2. This arrangement can ensure that the first end plate 441 will never contact the adjacent heat storage plate 43 during the rotation process, and at the same time, the distance between the magnetic plate 44 and the heat storage plate 43 can be minimized, the overall structure is compact, and the heat transfer efficiency is high.

[0047] As an example of the present invention, the heat-insulating connecting rod 48 includes a first connecting portion 481 and a second connecting portion 482. The first connecting portion 481 is provided with a first plug hole 484 at one end away from the second connecting portion 482, which is used to connect the rotating shaft of the power unit 47; the second connecting portion 482 can be inserted into the assembly hole 443 of the magnetic plate 44 to drive it to rotate as a whole. This arrangement ensures the effective transmission of power, and at the same time realizes the integrated rotation of the heat-insulating connecting rod 48 and the magnetic plate 44, thereby simplifying the assembly process and improving the stability and rotation efficiency of the overall structure.

[0048] As a preferred example of the present application, the cross-sectional area of ​​the first connecting portion 481 is greater than the cross-sectional area of ​​the second connecting portion 482, and a first limiting boss 483 is provided on the outer surface of the first connecting portion 481, and the first limiting boss 483 is used to limit the insulation connecting rod 48 when it passes through the top wall of the box body 41.

[0049] As an example of the present invention, the outer contour of the cross-sectional area of ​​the first connecting part 481 is circular, the outer contour of the cross-sectional area of ​​the second connecting part 482 is oblong, and the first plug hole 484 opened at one end of the first connecting part 481 is also designed to be oblong, so that the rotating shaft of the power unit 47 is inserted into the first plug hole 484, and the second connecting part 482 is inserted into the assembly hole 443 at the upper end of the magnetic plate 44, and can be smoothly plugged in even if there is a slight deviation, thereby improving the compatibility of the assembly and the stability of the transmission. This design enhances the stability of the structure through the optimization design of the shape, size and structure, ensures long-term stable operation, optimizes the stress distribution, reduces the stress concentration phenomenon, and prolongs the service life. The setting of the first limiting boss 483 can improve the insulation connecting rod 48 and simplify the installation process in the box body 41, thereby improving the installation efficiency and accuracy.

[0050] As an example of the present invention, the heat dissipation device 4 includes a heat conducting plate 45, which is located on one side of the box 41 close to the charging unit 2. The heat conducting plate 45 is arranged parallel to the heat storage plate 43 and is arranged in close contact with the heat storage plate 43 at one end of the box 41. This arrangement can quickly conduct the heat generated by the charging unit 2 to the heat storage plate 43 at one end of the box 41 through the heat conducting plate 45, and then quickly conduct it outward through the heat dissipation device 4, and the heat dissipation effect is good.

[0051] Preferably, the heat dissipation device 4 further includes a heat dissipation plate 46, which is disposed outside the housing 10 and located on a side of the box 41 away from the charging unit 2, and a side wall surface of the heat dissipation plate 46 is arranged in contact with a side wall of a heat storage plate 43 located at the other end of the box 41. This arrangement can quickly dissipate the heat conducted by the heat dissipation device 4 through the heat dissipation plate 46, so that the temperature difference at both ends of the heat dissipation device 4 is obvious and the heat dissipation effect is good.

[0052] Preferably, a ball assembly 49 is provided on the bottom plate 411 of the box body 41, and a sleeve (not shown in the figure) is provided at one end of the magnetic plate 44 away from the assembly hole 443, and the sleeve is sleeved on the ball assembly 49. This arrangement can ensure that the bottom of the magnetic plate 44 is in point contact with the ball assembly 49, with low running resistance and low noise.

[0053] As an example of the present invention, the ball assembly 49 includes a base 491, which is installed on the bottom plate 411 of the box body 41, and the upper part of the base 491 is provided with a receiving cavity 4911; the ball 492 is rotatably assembled in the receiving cavity 4911; the upper cover 493 is detachably connected to the base 491, and is used to cooperate with the receiving cavity 4911 to limit the ball 492; the upper cover 493 is provided with an avoidance hole 4932, and the upper part of the ball 492 protrudes from the avoidance hole 4932 and abuts against the upper end surface of the sleeve to support it. This setting makes the lower end of the magnetic plate 44 point contact, with small running resistance and low noise; the overall structure is simple and convenient for production and processing.

[0054] Preferably, the accommodating cavity 4911 includes a first cavity and a second cavity which are connected, the first cavity is hemispherical, the second cavity is located above the first cavity and is cylindrical, and the upper cover 493 is detachably covered on the second cavity. This arrangement can limit the assembly position of the ball 492 and provide installation space for the assembly of the upper cover 493, so as to minimize the overall height of the ball assembly 49 in the box body 41, and the effective volume of the magnetic plate 44 is large, and the heat dissipation effect is good.

[0055] Preferably, the inner wall of the accommodating cavity 4911 is provided with reinforcing ribs 4912, and the reinforcing ribs 4912 are multiple and arranged in a circular array with the lowest point of the accommodating cavity 4911 as the center, and the reinforcing ribs 4912 are formed by the protrusion of the accommodating cavity 4911 and the projection on the horizontal plane is a straight line segment. This arrangement can make the base 491 have a certain deformation ability and not easily break or damage, and at the same time minimize the contact area between the ball 492 and the reinforcing ribs 4912, further reducing the rolling resistance.

[0056] As an example of the present invention, the base 491 and the upper cover 493 are detachably connected through an assembly structure, and the assembly structure includes a buckle 4913 and a mounting groove 4931. The buckle 4913 is located on one of the base 491 and the upper cover 493, and the mounting groove 4931 is located on the other of the base 491 and the upper cover 493. The buckle 4913 is limitedly assembled in the mounting groove 4931. This setting structure is simple and the assembly efficiency is high.

[0057] As an example of the present invention, a limiting structure is provided between the base 491 and the upper cover 493, and the limiting structure includes a limiting block 4914 and a limiting notch 4933. The limiting block 4914 is located on one of the base 491 and the upper cover 493, and the limiting notch 4933 is located on the other of the base 491 and the upper cover 493. After installation, the limiting block 4914 is located in the limiting notch 4933. This arrangement can pre-position the installation of the assembly structure and improve assembly efficiency; at the same time, the limiting notch 4933 can enable the main body structure to have a certain deformation space, which is convenient for disassembly and assembly.

[0058] Preferably, the assembly structure is arranged on the outer peripheral side of the base 491, and the assembly structure and the limiting structure are at the same height and are arranged at a distance from each other. This arrangement can ensure stable and reliable assembly and avoid uneven force; at the same time, it will not interfere with the assembly of other structures, such as the assembly structure is located on the left and right sides of the base 491, and the limiting structure is located on the front and back sides of the base 491.

[0059] like Fig. 9 As shown, the charging pile further includes a conversion module 6, the input end of the charging unit 2 is connected to the AC power supply through a first connection line 7, the input end of the conversion module 6 is connected to the first connection line 7 through a second connection line 8, and the output end of the conversion module 6 is connected to the heat dissipation device 4. This setting enables the present application to set a conversion module 6 for parallel connection with the charging unit 2 on the basis of a conventional charging pile, and provide working current for the heat dissipation device 4 through the charging pile itself without affecting normal charging.

[0060] Preferably, the first connecting line 7 is provided with a first switch 71, the connection point between the second connecting line 8 and the first connecting line 7 is located between the first switch 71 and the conversion module 6, and the second connecting line 8 is provided with a second switch 81, so that during the charging process of the charging pile, the working current is intermittently provided to the heat dissipation device 4 by intermittently opening and closing the second switch 71.

[0061] Preferably, the output end of the conversion module 6 is connected to the magnetic field application module 42 and the power unit 47 respectively through the third connecting line 9, and a fourth switch 91 is provided between the conversion module 6 and the heat dissipation device 4. This setting can realize the intermittent operation of the magnetic field application module 3 and drive the periodic swing of the magnetic plate 44 without interfering with the normal charging of the charging pile. The central controller is connected to the first switch 71, the second switch 81, and the fourth switch 91 to control the opening and closing of the corresponding switches.

[0062] Preferably, the charging pile further includes a third switch 82, the third switch 82 is arranged in series with the fan assembly 5, and the third switch 82 is arranged in parallel with the heat dissipation device 4. This setting can selectively start the fan assembly 5, thereby achieving targeted heat dissipation in different scenarios.

[0063] Example 2

[0064] The present invention also provides a charging control method for a charging pile, comprising:

[0065] S1, obtaining a charging start signal, closing the first switch 71, and performing a normal charging process;

[0066] The charging start signal may be a user pressing a charging start button, or clicking to start charging on an app of a smart terminal.

[0067] Preferably, step S1 includes: obtaining a charging start signal to determine whether the charging gun is normally connected to the electric vehicle; if so, closing the first switch 71 and proceeding to step S2; if not, reminding that the charging gun is abnormally connected.

[0068] S2, real-time detection of the temperature T1 of the charging unit 2;

[0069] S3, determine whether T1 is greater than the first preset value K1, if so, proceed to step S4; if not, return to step S2;

[0070] Among them, since the performance and safety requirements of charging piles and charging units 5 of different specifications are often different, K1 in this application is a preset temperature value, and the present invention does not make specific limitations, and only uses individual numbers as examples, for example: K1 is about 40°C. Correspondingly, when T1≤K1, or in the process of returning to step S2, the second switch 81 and the third switch 82 are kept in the off state, and at this time, the heat dissipation device 4 and the fan assembly 5 are both in the shutdown state.

[0071] S4, determine whether T1 is greater than the set value K max If yes, then close the second switch 81 and the third switch 82, keep the fourth switch 91 open, and dissipate heat from the charging unit 2 through the fan assembly 5; if no, proceed to step S5;

[0072] S5 , closing the second switch 81 and the fourth switch 91 , keeping the third switch 82 open, and dissipating heat from the charging unit 2 through the heat dissipation device 4 .

[0073] When the temperature T1 of the charging unit 2 is detected to be higher than K maxWhen the temperature is too high, the heat dissipation device 4 is used to conduct heat to the charging unit 2 for dissipation. At this time, there is a great safety hazard and in most cases the temperature difference between the inside and outside of the charging pile is large. In this case, a traditional fan assembly 5 is used to drive the air flow to quickly dissipate heat and cool down, thereby preventing the temperature of the charging unit 2 from being too high and causing safety hazards. When the temperature is high, the heat dissipation device 4 is used to conduct heat to the charging unit 2 for dissipation. At this time, there will be no air convection between the inside of the charging pile and the outside world, thereby preventing the humidity and dust of the external environment from interfering with the operation of the charging unit 2, and the operating noise is small.

[0074] Since the application scenarios of charging piles vary, in order to further improve the intelligence of the heat dissipation of the charging unit 2 during the charging process of the charging pile, the present application further improves step S3.

[0075] Specifically, step S3 includes:

[0076] S31, real-time detection of external environment temperature T2;

[0077] S32, determine whether T2 is less than the first temperature value X1; if so, proceed to step S34; if not, proceed to step S33;

[0078] S33, determine whether T2 is greater than the second temperature value X2; if so, proceed directly to step S4; if not, proceed to step S36;

[0079] S34, determine whether T1 is greater than K1; if so, proceed to step S35; if not, return to step S2;

[0080] S35, judging whether the temperature increase of T1 in unit time is greater than the second preset value K2, or whether T1 is greater than the third preset value K3; if so, proceed to step S4; if not, return to step S2;

[0081] S36, determine whether T1 is greater than K1 and the sum of T1 and T2 is greater than a fourth preset value K4; if so, proceed to step S4; if not, return to step S2.

[0082] Among them, X1<X2, K3>K1. It should be additionally explained that the second preset value K2 is the temperature change value per unit time, and this application mainly reflects the temperature rise. Since the performance and safety requirements of charging piles and charging modules 5 of different specifications are often different, X1, X2, K1, K2, K3, and K4 in this application are all preset temperature data. This application does not make specific limitations, but only uses individual numbers as examples. For example: X1 is 5°C, X2 is 25°C, K1 is 40°C, K2 is 20°C / min, K3 is 60°C, and K4 can be equal to K3, or it can be other temperature values.

[0083] Specifically, when T2 is less than X1, it can be regarded as that the external ambient temperature is low (such as in winter), and the low temperature environment can better suppress the temperature rise of the charging unit 2. Accordingly, even if T1>K1, there is no need to start the heat dissipation device 4 immediately. Whether to start the heat dissipation device 4 can be determined by the temperature change of T1 or whether T is greater than K3. Through the two-level judgment process and the corresponding multi-condition analysis, unnecessary starting of the heat dissipation device 4 at low ambient temperature can be avoided, and frequent starting and stopping of the heat dissipation device 4 can be effectively avoided, which is also beneficial to improving the accuracy of the heat dissipation regulation of the charging unit 2 by the charging pile during the charging process.

[0084] When T2 is greater than X2, it can be considered that the external environment temperature is high (such as in summer), and the heat dissipation device is directly started to "transfer" the heat of the charging unit 2 to the outside of the shell 10 in time, thereby suppressing the temperature rise trend of the charging unit 2 in time and as early as possible, and avoiding the lagging operation of "dissipating heat after the temperature reaches a certain level".

[0085] When X1≤T2≤X2, the external ambient temperature can be regarded as suitable (normal temperature, such as spring and autumn). In addition to considering that T1 is greater than K1, the present application further combines T2 to perform temperature compensation on T1, and restarts the heat dissipation device 4 when T1+T2>K4, so that when the external ambient temperature is slightly lower, the heat dissipation can be appropriately delayed, and when the external ambient temperature is slightly higher, the heat dissipation can be appropriately started in advance, so that in the range of suitable ambient temperature, the heat dissipation device 4 can be intelligently regulated in combination with the current external ambient temperature, which is also beneficial to improving the accuracy of the heat dissipation regulation of the charging unit 2 by the charging pile during the charging process.

[0086] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A charging pile, comprising a charging unit (2), wherein an output end of the charging unit (2) is connected to a charging gun (3) and an AC power source respectively through a first connecting line (7), characterized in that: The charging pile further comprises a heat dissipation device (4) and a conversion module (6); the input end of the conversion module (6) is connected to the first connection line (7) via a second connection line (8); the output end of the conversion module (6) is connected to the heat dissipation device (4); the heat dissipation device (4) comprises a box (41), a heat storage plate (43), and a magnetic plate (44); the heat storage plate (43) and the magnetic plate (44) are located in the box (41) and are arranged at intervals from each other; magnetic field application modules (42) are arranged on both sides of the box (41) for periodically applying a magnetic field to and removing a magnetic field from the magnetic plate (44); the magnetic plate (44) can periodically alternately contact the heat storage plates (43) arranged adjacent to the two sides to conduct heat outward and dissipate heat from the charging unit (2).

2. The charging pile according to claim 1, characterized in that: The first connecting line (7) is provided with a first switch (71), the connection point between the second connecting line (8) and the first connecting line (7) is located between the first switch (71) and the conversion module (6), and the second connecting line (8) is provided with a second switch (81).

3. The charging pile according to claim 2, characterized in that: The charging pile further comprises a fan assembly (5), a third switch (82) is arranged between the fan assembly (5) and the conversion module (6), a fourth switch (91) is arranged between the heat dissipation device (4) and the conversion module (6), and the fan assembly (5) and the heat dissipation device (4) are arranged in parallel.

4. The charging pile according to claim 1, characterized in that: The box body (41) is made of a non-heat-conducting material and a heat-insulating layer (412) is arranged on the outer surface of the box body (41). A power unit (47) is arranged outside the box body (41). The output end of the power unit (47) is drivingly connected to the magnetic plate (44) through a heat-insulating connecting rod (48) so as to drive the magnetic plate (44) to rotate in a forward or reverse direction and selectively contact one of the heat storage plates (43) on the adjacent two sides.

5. The charging pile according to claim 4, characterized in that: The magnetic plate (44) comprises a first end plate (441) and a second end plate (442) which are arranged opposite to each other. An assembly hole (443) is arranged between the first end plate (441) and the second end plate (442) for transmission connection with the heat insulation connecting rod (48). The projection lengths of the first end plate (441) and the second end plate (442) on the horizontal plane are L1, L2 and L3 respectively. L2, where L1<L2.

6. The charging pile according to claim 5, characterized in that: A second side wall surface (4421) and a third side wall surface (4422) are respectively provided on both sides of the second end plate (442), and the third side wall surface (4422) is provided close to the first end plate (441). The planes where the two second side wall surfaces (4421) are arranged opposite to each other form an angle α1, and the planes where the two third side wall surfaces (4422) are arranged opposite to each other form an angle α2, wherein α1<α2.

7. The charging pile according to claim 4, characterized in that: The heat-insulating connecting rod (48) includes a first connecting portion (481) and a second connecting portion (482); the first connecting portion (481) is provided with a first plug hole (484) at one end away from the second connecting portion (482) for connecting to the rotating shaft of the power unit (47); the second connecting portion (482) can be inserted into the assembly hole (443) of the magnetic plate (44) to drive it to rotate as a whole.

8. The charging control method for a charging pile according to any one of claims 1 to 7, characterized in that: include: S1, obtaining a charging start signal, closing a first switch (71), and performing a normal charging process; S2, detecting the temperature T1 of the charging unit (2) in real time; S3, determine whether T1 is greater than the first preset value K1, if so, proceed to step S4; if not, return to step S2; S4, determine whether T1 is greater than the set value K max If so, close the second switch (81) and the third switch (82), keep the fourth switch (91) open, and dissipate heat from the charging unit (2) through the fan assembly (5); if not, proceed to step S5; S5, closing the second switch (81) and the fourth switch (91), keeping the third switch (82) open, and dissipating heat from the charging unit (2) through the heat dissipation device (4).

9. The charging control method of the charging pile according to claim 8, characterized in that: Step S3 includes: S31, real-time detection of external environment temperature T2; S32, determine whether T2 is less than the first temperature value X1; if so, proceed to step S34; if not, proceed to step S33; S33, determine whether T2 is greater than the second temperature value X2; if so, proceed directly to step S4; if not, proceed to step S36; S34, determine whether T1 is greater than K1; if so, proceed to step S35; if not, return to step S2; S35, judging whether the temperature increase of T1 in unit time is greater than the second preset value K2, or whether T1 is greater than the third preset value K3; if so, proceed to step S4; if not, return to step S2; S36, determine whether T1 is greater than K1 and the sum of T1 and T2 is greater than a fourth preset value K4; if so, proceed to step S4; if not, return to step S2.

Images