Low-temperature-resistant charging pile

Abstract

The low-temperature-resistant charging pile comprises a heating module and a power module which are adjacently arranged, and the power module is located in a shell and used for charging an electric vehicle; the heating module 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 plate can periodically and alternately contact with the adjacent heat storage plates on the two sides to heat the power module. The power module can be heated through the heating module, so that the working environment temperature of the power module is obviously higher than the outdoor environment temperature, and the electric vehicle can be efficiently charged in the low-temperature environment of the high-latitude and / or high-altitude area.

Description

Technical Field

[0001] The present invention relates to the technical field of charging equipment, and in particular to a low-temperature resistant charging pile. Background Art

[0002] With the rapid development and popularization of electric vehicles, the number of charging piles has increased rapidly and their distribution has become more extensive. However, in Northeast my country and North China, the outdoor temperature in winter is often below minus 30 degrees Celsius; at this time, the charging piles themselves do not need to consider heat dissipation, but the cold winter environment will have an adverse effect on the use of charging piles.

[0003] To this end, the utility model patent with application number 201720468058.8 discloses a low-temperature resistant electric vehicle charging pile to solve the problem that the charging device proposed above is not good at low temperature resistance. By setting a fan and a heater at the bottom of the charging pile, the fan is controlled to rotate by a controller under low temperature conditions, and the fan blows the wind through the heater to heat it and flow upward, so as to enable the normal operation of the charging module. Since the electric vehicle charging pile can be heated by the outside world, the charging efficiency of the charging pile under low temperature conditions is improved. However, the gas inside the charging pile continues to flow and the outdoor temperature is extremely low. Continuous heating and blowing are required to maintain a relatively stable operating environment inside the charging pile, which leads to high energy consumption itself.

[0004] It can be seen from this that the present invention is specifically proposed. Summary of the invention

[0005] The problem solved by the present invention is that the structure of the existing charging pile is unreasonable, resulting in the disadvantages of high energy consumption and poor charging efficiency under low temperature conditions.

[0006] To solve the above problems, the present invention provides a low-temperature resistant charging pile, comprising a heating module and a power module arranged adjacent to each other, wherein the power module is located in a shell and is used to charge electric vehicles; the heating module comprises a box body, a heat storage plate, and a magnetic plate, wherein the heat storage plate and the magnetic plate are located in the box body and are spaced apart from each other, and magnetic field application modules are arranged on both sides of the box body for periodically applying and removing magnetic fields to the magnetic plates; the magnetic plates can periodically contact the heat storage plates adjacent to both sides alternately to achieve heating of the power module.

[0007] This setting will not cause thermal convection of the air in the shell, and heat can continue to accumulate near the power module, so that the power module maintains a relatively suitable temperature under low temperature conditions, which can ensure the stable operation of the charging pile in Northeast and North my country. Dust particles will not be introduced into the shell, thereby improving its operational stability and reliability. The entire process does not require the use of traditional refrigerants such as Freon and gas compressors, and has a simple structure and low operating costs.

[0008] Preferably, a bracket is provided in the housing, a cross bar is fixedly provided above the bracket, the cross bar is connected to the second power supply, and a conduction block is provided at the lower side of one end of the cross bar, the heating module is connected to the second power supply and the conduction block respectively through connecting wires, and a temperature control structure is provided on the cross bar, which enables the cross bar to contact and conduct with the conduction block when the threshold temperature is met, thereby driving the heating module to operate. This setting structure is simple, and can realize conduction to enable the heating module to operate when the outdoor temperature is lower than a specific value, which is conducive to automatic temperature control inside the charging pile.

[0009] Preferably, the temperature control structure includes a lower seat plate, the lower seat plate is provided with a spring and an electromagnet, the spring and the electromagnet are located on both sides of the bracket, the upper end of the spring is connected to the cross bar and is in a stretched state, the electromagnet is located on the side of the bracket away from the conductive block, and the electromagnet is arranged in series with the NTC thermistor and the first power supply.

[0010] When the outside temperature drops, the resistance of the NTC thermistor increases to a certain value. At this time, the current passing through the electromagnet is small, resulting in the corresponding magnetic force being smaller than the tension of the spring. The spring pulls one end of the crossbar downward and contacts the conduction block. At this time, the heating module is energized to heat the power module inside the charging pile, so that the ambient temperature of the power module is higher than the outdoor temperature and tends to be stable, which is beneficial to the working stability of the charging pile in a low temperature environment.

[0011] 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 reverse and selectively contact one of the two adjacent heat storage plates.

[0012] This setting can ensure that the heating module is less affected by the ambient temperature. At the same time, the heating module transfers the external heat to the power module through the magnetic plate to heat it, and there is little heat convection in the whole process. It ensures that there is a temperature difference between adjacent heat storage plates, which has a good heating effect on the inside of the charging pile. By setting up a thermal insulation connecting rod, the cold or heat of the magnetic plate can be prevented from being transferred to the power unit, ensuring stable and reliable operation of the power unit.

[0013] Preferably, the heat-insulating connecting rod comprises a first connecting part and a second connecting part, wherein the first connecting part is provided with a first plug hole at one 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 the magnetic plate to rotate integrally. This arrangement ensures the effective transmission of power and realizes the integrated rotation of the heat-insulating connecting rod and the magnetic plate, thereby simplifying the assembly process and improving the stability and rotation efficiency of the overall structure.

[0014] Preferably, the cross-sectional area of ​​the first connection portion is greater than the cross-sectional area of ​​the second connection portion, and a first limiting boss is provided on the outer surface of the first connection portion, and the first limiting boss is used to limit the heat insulation connecting rod when it passes through the top wall surface of the box body. This arrangement enhances the stability of the structure, ensures long-term stable operation, optimizes stress distribution, reduces stress concentration, and prolongs service life. The provision of the first limiting boss simplifies the installation process of the heat insulation connecting rod in the box body, and improves installation efficiency and accuracy.

[0015] Preferably, a ball assembly is arranged on the bottom plate of the box, and a sleeve is arranged at one end of the magnetic plate away from the assembly hole, and the sleeve is sleeved on the ball assembly. This arrangement can ensure that the bottom of the magnetic plate is in point contact with the ball assembly, and the running resistance is small; by using the ball portion extending into the sleeve, the lower end of the magnetic plate can be limited, effectively preventing it from falling out during rotation; the sleeve covers the ball assembly, which can effectively prevent dust and the like from falling into the ball assembly, ensuring that its running resistance is small.

[0016] Preferably, the ball assembly includes a base, which is mounted on the bottom plate of the box, and a receiving cavity is arranged on the upper part of the base; the ball is rotatably assembled in the receiving cavity; the upper cover is detachably connected to the base and is used to cooperate with the receiving cavity to limit the ball; the upper cover is provided with an avoidance hole, and the upper part of the ball protrudes from the avoidance hole and abuts against the upper end surface of the sleeve to support it. This arrangement makes the lower end of the magnetic plate point contact, with low running resistance and low noise; the overall structure is simple and convenient for production and processing.

[0017] Preferably, the inner wall of the accommodating cavity is provided with reinforcing ribs, and the reinforcing ribs are multiple and arranged in a circular array with the lowest point of the accommodating cavity as the center, and the reinforcing ribs are formed by the protrusion of the accommodating cavity part and the projection on the horizontal plane is a straight line segment. This arrangement can make the base have a certain deformation ability and not easily break or damage, and at the same time minimize the contact area between the ball and the reinforcing ribs, further reducing the rolling resistance.

[0018] 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.

[0019] This arrangement brings the axis of the magnetic plate close to its center position, ensuring that the forces on both ends of the magnetic plate in the length direction are relatively uniform; the rotation of the magnetic plate enables the second end plate to contact the adjacent heat storage plate, while the first end plate will not contact the heat storage plate on the other side, ensuring that the magnetic plates are in contact with the adjacent heat storage plates respectively, and the heat transfer is stable and reliable.

[0020] Compared with the prior art, the low-temperature resistant charging pile described in the embodiment of the present invention has the following beneficial effects: 1) The power module can be heated by the heating module, so that the working environment temperature of the power module will be significantly higher than the outdoor environment temperature, and the electric vehicle can be efficiently charged in the low temperature environment of high latitudes and / or high altitudes; 2) By setting the temperature control module, it can automatically start when the outdoor temperature is lower than the preset value, and the operating energy consumption is low; since the whole process does not require fan drive, there is no air convection, and dust particles will not be introduced into the charging pile, the charging pile has good operating stability and a long service life; 3) The structure is simple and the production cost is low, which is conducive to large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the internal structure of a low-temperature resistant charging pile according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall structure of the heating module according to an embodiment of the present invention;

[0023] Figure 3 is a schematic cross-sectional view of a heating module according to an embodiment of the present invention;

[0024] Figure 4 is a longitudinal cross-sectional schematic diagram of a heating module according to an embodiment of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the magnetic plate according to an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the structure of the heat-insulating connecting rod according to an embodiment of the present invention

[0027] Figure 7 is a cross-sectional schematic diagram of a ball assembly according to an embodiment of the present invention;

[0028] Figure 8 It is an exploded schematic diagram of the ball assembly described in the embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 1-power module; 2-bracket; 3-cross bar; 4-heating module; 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-heating plate; 46-heat conducting plate; 47-power unit; 48-insulation connecting rod; 481-first connecting part; 482-third Two connecting parts; 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-electromagnet; 6-NTC thermistor; 7-first power supply; 8-spring; 9-conduction block; 10-second power supply; 11-lower seat plate; 100-housing. DETAILED DESCRIPTION

[0031] 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. The technical features of the embodiments of the present invention can be combined with each other without conflict.

[0032] 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.

[0033] 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.

[0034] With the development of the electric vehicle charging industry, charging piles for electric vehicle charging are also being rapidly constructed and installed, and the number of charging piles in the Northeast and North China regions in winter is also continuing to increase. Since current research is mainly focused on the high-temperature heat dissipation problem of charging piles, there is less research attention on how to balance the operating stability and economy of charging piles under low temperature conditions.

[0035] Since charging electric vehicles with charging piles is a frequently used part of user usage and is also a key factor affecting user experience, solving this problem can significantly improve the market competitiveness of charging piles. The magnetocaloric effect (MCE) of magnetic materials refers to the completion of periodic magnetic phase changes under the action of a magnetic field, which can achieve efficient cooling or a certain heating effect at a lower energy consumption. Specifically: 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. To this end, the applicant proposes the following solution:

[0036] like Figure 1-8 As shown, a low-temperature resistant charging pile includes a heating module 4 and a power module 1 which are arranged adjacent to each other. The power module 1 is located in a shell 100 and is used to charge an electric vehicle. The heating module 4 is located outside the shell 100 at an end away from the power module 1 and is used to heat the power module 1. The heating module 4 includes 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 spaced apart from each other. Magnetic field applying modules 42 are arranged on both sides of the box 41 for periodically applying and removing magnetic fields to the magnetic plates 44. The magnetic plates 44 can periodically contact the heat storage plates 43 adjacent to both sides alternately to conduct heat into the shell 100 to heat the power module 1.

[0037] This setting will not cause thermal convection of the air in the shell 100, and heat can continue to accumulate near the power module 1, so that the power module 1 maintains a relatively suitable temperature under low temperature conditions, which can ensure the stable operation of the charging pile in Northeast my country and North China; dust particles will not be introduced into the shell 100, improving its operational stability and reliability; the entire process does not require the use of traditional refrigerants such as Freon and gas compressors, and has a simple structure and low operating costs. As an example of the present invention, the heating module 4 is located on the lower side of the power module 1, and the heat generated by the heating module 4 can be dissipated upward to achieve heating of the power module 1, ensuring that its operating environment temperature is higher than the outdoor environment temperature.

[0038] 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 close to the side of the power module 1 and releases heat; when the magnetic field applied by the magnetic field applying module 42 is eliminated, the magnetic plate 44 is lowered and absorbs heat due to the magnetocaloric effect; as the magnetic plate 44 alternately contacts the heat storage plates 43 on both sides and absorbs and dissipates heat, heat is conducted from the outside to the side of the power module 1, thereby achieving heating of the power module 1.

[0039] As an example of the present invention, a bracket 2 is provided in the housing 100, a cross bar 3 is fixedly provided above the bracket 2, the cross bar 3 is connected to the second power supply 10, and a conduction block 9 is provided at the lower side of one end of the cross bar 3, the heating module 4 is respectively connected to the second power supply 10 and the conduction block 9 through connecting wires, and a temperature control structure is provided on the cross bar 3, so that the cross bar 3 can contact and conduct with the conduction block 9 when the threshold temperature is met, thereby driving the heating module 4 to operate. The structure of the setting is simple, and can realize conduction when the outdoor temperature is lower than a specific value, so that the heating module 4 operates.

[0040] Preferably, the temperature control structure includes a lower seat plate 11, and the lower seat plate 11 is provided with a spring 8 and an electromagnet 5, the spring 8 and the electromagnet 5 are located on both sides of the bracket 2, the upper end of the spring 8 is connected to the cross bar 3 and is in a stretched state, the electromagnet 5 is located on the side of the bracket 2 away from the conduction block 9, and the electromagnet 5 is arranged in series with the NTC thermistor 6 and the first power supply 7. When the outside temperature decreases, the resistance of the NTC thermistor 6 increases to a certain value. At this time, the current passing through the electromagnet 5 is small, resulting in the corresponding magnetic force being smaller than the tension of the spring 8. The spring 8 pulls the crossbar 3 downward and contacts the conductive block 9. At this time, the heating module 4 is powered on to work, thereby heating the power module 1 inside the charging pile, so that the ambient temperature of the power module 1 is higher than the outdoor temperature and tends to be stable, which is beneficial to the working stability of the charging pile in a low temperature environment; the heating module 4 does not have air convection during operation, so the operating power is low; when the ambient temperature is higher than a specific value, the resistance of the NTC thermistor 6 is reduced to a specific value. At this time, the magnetic force of the electromagnet 5 is greater than the tension of the spring 8, and the electromagnet 5 pulls the crossbar 3 to move and disconnects from the conductive block 9, thereby achieving an energy-saving effect. The first power supply 7 and the second power supply 10 can be independent battery modules, or they can be connected to the power module 1 to provide electrical energy.

[0041] The power module 1 includes a rectifier unit and / or a power conversion unit, wherein the rectifier unit converts the input alternating current (AC) into direct current (DC) for charging the electric vehicle battery, and the power conversion unit is responsible for adjusting the output voltage and current to accurately match the charging requirements of the electric vehicle battery, while removing the electrical noise generated during the rectification process through a filter to make the output DC more stable.

[0042] Preferably, the box body 41 itself is non-heat-conductive and an insulation layer 412 is provided on the outer surface. This arrangement ensures that the heating module 4 is less affected by the ambient temperature, and at the same time, the heat dissipation of the heating module 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 the heating effect inside the charging pile is good. The shape of the box body 41 can be a cube, a cuboid or other shapes.

[0043] 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.

[0044] 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 into the shell 100.

[0045] 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 41. 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 beneficial to dust prevention and dehumidification of the charging pile.

[0046] 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.

[0047] 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 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 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 with the adjacent heat storage plate 43, while the first end plate 441 will not contact with the heat storage plate 43 on the other side, ensuring that the magnetic plate 44 contacts with the adjacent heat storage plate 43 alternately, and the heat transfer is stable and reliable.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] As an example of the present invention, the heating module 4 includes a heating plate 45, the heating plate 45 is located on a side of the box 41 close to the power module 1, the heating 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 external heat to the heat storage plate 43 at one end of the box 41 through the heating plate 45 and then conduct it to the power module 1 in sequence, and the heating effect is good.

[0054] Preferably, the heating module 4 further includes a heat conducting plate 46, which is disposed outside the housing 100 and located on a side of the box body 41 away from the power module 1, and a side wall surface of the heat conducting plate 46 is arranged in contact with a side wall of a heat storage plate 43 located at the other end of the box body 41. This arrangement can quickly conduct external heat to the power module 1 through the heat conducting plate 46, so that the temperature difference at both ends of the heating module 4 is obvious and the heating effect is good.

[0055] 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.

[0056] 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.

[0057] Preferably, the accommodating chamber 4911 includes a first chamber and a second chamber that are connected, the first chamber is hemispherical, the second chamber is located above the first chamber and is cylindrical, and the upper cover 493 is detachably covered on the second chamber. This arrangement can limit the assembly position of the ball 492 and provide installation space for the assembly of the upper cover 493, so that the overall height of the ball assembly 49 in the box body 41 is as low as possible, the effective volume of the magnetic plate 44 is large, and the heating effect is good.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] The low-temperature resistant charging pile described in the present invention automatically starts the heating module 4 to heat the power module 1 when the outdoor temperature is lower than a preset value. Since the heating module 4 does not cause thermal convection of the air during operation, and considering that the power module 1 also generates heat during operation, the working environment temperature will be significantly higher than the outdoor environment temperature, and the charging efficiency is high and the operation is stable and reliable; for example, when the outdoor temperature is lower than minus 30°C, the heating module 4 can be powered on and operated through the temperature control structure, so that the ambient temperature of the power module 1 is minus 15°C or minus 5°C or even 5°C or 20°C, thereby efficiently charging the electric vehicle in a low temperature environment in high latitudes and / or high altitudes; since the entire process does not require fan drive, there is no air convection, and dust particles will not be introduced into the charging pile, the charging pile has good operating stability and a long service life.

[0063] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various 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 low temperature resistant charging pile, characterized in that: The invention comprises a heating module (4) and a power module (1) which are arranged adjacent to each other. The power module (1) is located in a housing (100) and is used to charge an electric vehicle. The heating module (4) comprises a housing (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 housing (41) and are arranged at intervals from each other. Magnetic field applying modules (42) are arranged on both sides of the housing (41) and are used to periodically apply a magnetic field to and remove a magnetic field from the magnetic plate (44). The magnetic plate (44) can periodically contact the heat storage plates (43) adjacent to the two sides in an alternating manner to heat the power module (1).

2. The low temperature resistant charging pile according to claim 1, characterized in that: A bracket (2) is arranged in the shell (100), a cross bar (3) is fixedly arranged above the bracket (2), the cross bar (3) is connected to a second power source (10), and a conduction block (9) is arranged at the lower side of one end of the cross bar (3), the heating module (4) is respectively connected to the second power source (10) and the conduction block (9) through a connecting line, and a temperature control structure is arranged on the cross bar (3), which can make the cross bar (3) contact and conduct with the conduction block (9) when a threshold temperature is met, thereby driving the heating module (4) to operate.

3. The low temperature resistant charging pile according to claim 2, characterized in that: The temperature control structure comprises a lower seat plate (11), the lower seat plate (11) is provided with a spring (8) and an electromagnet (5), the spring (8) and the electromagnet (5) are located on both sides of the bracket (2), the upper end of the spring (8) is connected to the cross bar (3) and is in a stretched state, the electromagnet (5) is located on a side of the bracket (2) away from the conduction block (9), and the electromagnet (5) is arranged in series with an NTC thermistor (6) and a first power supply (7).

4. The low temperature resistant 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 two adjacent heat storage plates (43).

5. The low temperature resistant 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.

6. The low temperature resistant charging pile according to claim 5, characterized in that: 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 heat-insulating connecting rod (48) when it passes through the top wall of the box body (41).

7. The low temperature resistant charging pile according to claim 5, characterized in that: A ball assembly (49) is arranged on the bottom plate (411) of the box body (41), and a sleeve is arranged on the end of the magnetic plate (44) away from the assembly hole (443), and the sleeve is sleeved on the ball assembly (49).

8. The low temperature resistant charging pile according to claim 7, characterized in that: The ball assembly (49) comprises a base (491) mounted on the bottom plate (411) of the box body (41), the upper part of the base (491) being provided with a receiving cavity (4911); a ball (492) being rotatably assembled in the receiving cavity (4911); an upper cover (493) being detachably connected to the base (491) and being used to cooperate with the receiving cavity (4911) to limit the position of the ball (492); an avoidance hole (4932) being provided on the upper cover (493), the upper part of the ball (492) protruding out of the avoidance hole (4932) and abutting against the upper end surface of the sleeve to support it.

9. The low temperature resistant charging pile according to claim 8, characterized in that: 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. 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.

10. The low temperature resistant charging pile according to claim 1, 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-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.

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