A charging pile and a charging control method thereof

Abstract

The present invention provides a charging pile and a charging control method thereof, wherein the charging pile comprises a heat dissipation device and a charging gun, wherein the heat dissipation device comprises a box body, a heat storage plate and a magnetic plate, wherein a heat dissipation plate is arranged at one end of the box body, and a heat exchange bin is arranged at the other end; the heat storage plate and the magnetic plate are located in the box body and are arranged at intervals from each other; magnetic field application modules are arranged on both sides of the box body, which are used to periodically apply a magnetic field to and remove the magnetic field from the magnetic plate, and the magnetic plate can periodically contact the heat storage plates arranged adjacent to each other on both sides alternately, so as to cool down the refrigerant medium in the heat exchange bin; a heat dissipation chamber is arranged on the outer wall of a battery module of an electric vehicle, and the heat exchange bin is connected to the heat dissipation chamber through a charging gun, so as to supply a refrigerant medium to the heat dissipation chamber; during the charging process of the electric vehicle, the present invention can provide a good cooling effect for the battery module of the electric vehicle, thereby avoiding excessive temperature of the battery during charging; and at the same time, the generation of vibration or noise can be effectively reduced during the entire cooling process.

Description

Technical Field

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

[0002] With the development of automobile technology, electric vehicles occupy an increasingly higher proportion in vehicles; electric vehicles are often powered by electrical energy stored in batteries, and the batteries need to be charged frequently.

[0003] During the actual charging process, the battery itself tends to generate heat, especially in high temperature seasons, which will further increase the battery temperature, increase the activity of various active substances in the battery, and increase the internal pressure of the battery. At this time, the battery is prone to problems such as overcharging, thermal runaway, and even explosion and combustion.

[0004] In response to this situation, the prior art has proposed a charging pile that can deliver cold medium to the battery to cool the battery. For example, patent CN106711549A uses a condensing radiator to cool the coolant, and then delivers the cooled coolant to the battery module through a charging gun to achieve battery cooling. In addition, there are patents such as CN108275021A and CN106864284A, which both use similar technologies, using heat pump systems or air cooling devices to cool the refrigerant, deliver cold medium to the battery, and cool the battery.

[0005] However, in the refrigeration process of the prior art, the air cooling form often has a poor cooling effect and its operating noise is relatively large; although the heat pump refrigeration form has a good cooling effect, its energy consumption is relatively large and its operating noise is also relatively large. Summary of the invention

[0006] In view of this, the present invention aims to propose a charging pile and a charging control method thereof, so as to solve the problems of poor cooling effect and high operating noise in the process of cooling the battery by the charging pile in the prior art.

[0007] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0008] A charging pile comprises a heat dissipation device and a charging gun, wherein the heat dissipation device comprises a box, a heat storage plate and a magnetic plate, wherein a heat dissipation plate is arranged at one end of the box and a heat exchange chamber is arranged at the other end; the heat storage plate and the magnetic plate are located in the box and are arranged at intervals from each other; magnetic field application modules are arranged on both sides of the box for periodically applying a magnetic field to and removing a magnetic field from the magnetic plate, and the magnetic plate can periodically contact the heat storage plates arranged adjacent to each other on both sides alternately for cooling and cooling a refrigerant in the heat exchange chamber; a heat dissipation chamber is arranged on the outer wall of a battery module of an electric vehicle, and the heat exchange chamber is connected to the heat dissipation chamber through a charging gun for supplying a refrigerant to the heat dissipation chamber.

[0009] Furthermore, a power unit is arranged on the outer wall of the box body, and the output end of the power unit passes through the box body through a heat-insulating connecting rod and is connected to the magnetic plate, 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.

[0010] Furthermore, the magnetic plate includes a first end plate and a second end plate that are arranged opposite to each other, and an assembly hole is provided between the first end plate and the second end plate for connecting with the insulation connecting rod. 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.

[0011] Furthermore, a second side wall surface and a third side wall surface are respectively provided on both sides of the second end plate, and the third side wall surface is provided close to the first end plate. The planes where the two second side wall surfaces are relatively provided form an angle α1, and the planes where the two third side wall surfaces are relatively provided form an angle α2, wherein α1<α2.

[0012] Furthermore, the first end plate includes first side wall surfaces that are arranged opposite to each other, the two first side wall surfaces are arranged vertically and the planes where they are located form an angle α3, wherein α1<α3<α2.

[0013] Furthermore, the heat exchange chamber is fitted with the heat storage plate in the box body that is closest to the heat exchange chamber; and the heat dissipation plate is fitted with the heat storage plate in the box body that is closest to the heat dissipation plate.

[0014] Furthermore, a liquid inlet pipeline and a liquid return pipeline are provided in the charging gun, the outlet of the heat exchange bin is connected with the liquid inlet of the heat dissipation chamber through the liquid inlet pipeline, and the inlet of the heat exchange bin is connected with the liquid outlet of the heat dissipation chamber through the liquid return pipeline; an infusion pump is provided at the outlet and / or inlet of the heat exchange bin to drive the flow of the refrigerant medium.

[0015] Furthermore, the charging pile includes an AC power supply, a first converter, and a second converter. The AC power supply is connected to the input end of the first converter through a charging main line group, and the output end of the first converter is connected to the charging gun; the AC power supply is connected to the input end of the second converter through a secondary line group, and the output end of the second converter is connected to a magnetic field application module; the charging main line group is provided with a first switch, and the secondary line group is provided with a second switch.

[0016] Furthermore, the output end of the second converter is connected to the magnetic field applying module through a third circuit, the output end of the second converter is connected to the driver through a fourth circuit, and the third circuit is provided with a third switch.

[0017] A charging control method for a charging pile, using the charging pile, the charging control method comprising: S1, obtaining a charging start signal and closing a first switch; S2, detecting the temperature T1 of a battery module in real time; S3, judging whether T1 is greater than a first preset value K1; if so, proceeding to step S4; if not, returning to step S2;

[0018] S4. Start the infusion pump of the heat exchange chamber, close the second switch, keep the third switch open, and the power unit drives the magnetic plate to contact the heat storage plate on the side close to the heat exchange chamber, and the closing time P1 of the second switch is timed; S5. Determine whether P1 is greater than the first time length Q1; if so, reset P1 to zero and proceed to step S6; if not, maintain the current state and re-execute step S5; S6. The power unit drives the magnetic plate to fit the heat storage plate away from the side of the heat exchange chamber, and closes the third switch at the same time. The magnetic field application module provides a magnetic field to the magnetic plate, and the closing time P2 of the third switch is timed; S7. Determine whether P2 is greater than the second time length Q2; if so, reset P2 to zero and return to step S2; if not, maintain the current state and re-execute step S7.

[0019] Compared with the prior art, the charging pile and the charging control method thereof described in the present invention have the following advantages:

[0020] A charging pile and a charging control method thereof described in the present invention enable heat to be "transported" to the external environment step by step and successively from the heat exchange bin to the heat dissipation plate, so that heat is continuously transferred from the heat exchange bin to the heat dissipation plate to achieve cooling and cooling of the refrigerant medium in the heat exchange bin. During the charging process of the electric vehicle, the heat exchange bin can send the refrigerant medium into the heat dissipation chamber through the charging gun, providing a good cooling effect for the battery module of the electric vehicle to avoid the battery from being overheated during charging; in addition, during the entire cooling process, the magnetic plate performs periodic movement and the magnetic field application module periodically provides a magnetic field, which can effectively reduce the generation of vibration or noise. In addition, this setting makes the heat dissipation effect of the charging pile unaffected by the external temperature, has good heat dissipation effect and low energy consumption; at the same time, the operation of the heat dissipation device will not cause thermal convection of the air, and will not send air with high humidity and dust into the charging pile, ensuring that the charging pile maintains a stable temperature during long-term high-load operation, thereby improving its performance and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 This is a schematic diagram of an application scenario of the charging pile according to an embodiment of the present invention when charging an electric vehicle;

[0023] Figure 2 This is a schematic diagram of the overall structure of the heat dissipation device according to an embodiment of the present invention;

[0024] Figure 3 It is a schematic transverse cross-sectional view of a heat dissipation device according to an embodiment of the present invention;

[0025] Figure 4 A longitudinal cross-sectional schematic diagram of a heat dissipation device according to an embodiment of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the magnetic plate according to an embodiment of the present invention;

[0027] Figure 6 Schematic diagram of the structure of the heat-insulating connecting rod according to an embodiment of the present invention

[0028] Figure 7 is a cross-sectional schematic diagram of a ball assembly according to an embodiment of the present invention;

[0029] Figure 8 It is an exploded schematic diagram of the ball assembly according to an embodiment of the present invention;

[0030] Fig. 9 The figure is a schematic diagram of the circuit structure of the charging pile described in the embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Charging main line group; 11. First switch; 2. Auxiliary line group; 21. Second switch; 3. Third line; 31. Third switch; 4. Heat dissipation device; 41. Box; 411. Bottom plate; 412. Heat 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 dissipation plate; 46. Heat exchange chamber; 4 61. heat exchange chamber; 462. heat exchange fins; 47. power unit; 48. heat insulation connecting rod; 481. first connecting 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. mounting groove; 4932. avoidance hole; 4933. limiting notch; 5. fourth circuit. DETAILED DESCRIPTION

[0033] The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the essence of their work to other persons skilled in the art. However, these inventive concepts can be embodied in many different forms and should not be considered limited to the embodiments described herein.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0036] In order to solve the problem that the cooling effect is poor and the operation noise is loud when the charging pile cools the battery in the prior art, this embodiment proposes a charging pile, such as the attached Figure 1-9 As shown, the charging pile includes a heat dissipation device 4 and a charging gun. The heat dissipation device 4 includes a box body 41, a heat storage plate 43, and a magnetic plate 44. A heat dissipation plate 45 is arranged at one end of the box body 41, and a heat exchange bin 46 is arranged at the other end. The heat exchange bin 46 can contain a refrigerant medium; in the direction from the heat dissipation plate 45 to the heat exchange bin 46, the heat storage plate 43 and the magnetic plate 44 are located in the box body 41 and are arranged at intervals from each other; a magnetic field application module 42 is arranged on both sides of the box body 41, which is used to periodically apply a magnetic field to and remove a magnetic field from the magnetic plate 44, and the magnetic plate 44 can periodically and alternately contact with the heat storage plates 43 arranged adjacent to both sides, so as to cool and cool the refrigerant medium in the heat exchange bin 46; a heat dissipation chamber is arranged on the outer wall of the battery module of the electric vehicle, and the heat exchange bin 46 is connected with the heat dissipation chamber through the charging gun, so as to supply a refrigerant medium to the heat dissipation chamber.

[0037] The heat sink 45 transfers heat from the heat sink 4 . The heat sink 45 can be directly arranged to contact with the external environment, or to contact or exchange heat with other low-temperature objects.

[0038] The magnetic plate 44 described in the present application is a magnetic material, and the property of the magnetic material that it becomes hot when magnetized under the action of a magnetic field and becomes cold when demagnetized is utilized; when the magnetic field applying module 42 applies a 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 heat exchange chamber 46 and conducts the heat toward the heat sink 45; when the magnetic field applied by the magnetic field applying module 42 is eliminated, the magnetic plate 44 becomes cold 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 heat exchange chamber 46 and takes away the heat in the direction close to the heat exchange chamber 46; as the magnetic plate 44 alternately contacts the heat storage plates 43 on both sides and absorbs and dissipates heat, the heat is "transported" step by step and successively from the heat exchange chamber 46 to the heat sink 45, so that the heat is continuously transferred from the heat exchange chamber 46 to the heat sink 45, so as to realize cooling and cooling of the refrigerant medium in the heat exchange chamber 46. During the charging process of the electric vehicle, the heat exchange chamber 46 can deliver the refrigerant medium into the heat dissipation chamber through the charging gun, providing a good cooling effect for the battery module of the electric vehicle to prevent the battery from being overheated during charging; in addition, in the entire cooling process, only the magnetic plate 44 moves periodically and the magnetic field application module 42 provides a magnetic field periodically, which can effectively reduce the generation of vibration or noise. In addition, this setting makes the heat dissipation effect of the charging pile unaffected by the external temperature, with good heat dissipation effect and low energy consumption; at the same time, the operation of the heat dissipation device 4 will not cause thermal convection of the air, and will not deliver humid air and dust into the charging pile, ensuring that the charging pile maintains a stable temperature during long-term high-load operation, thereby improving its performance and reliability.

[0039] The magnetic field applying module 42 can be a conventional electromagnet in the prior art, which can generate a magnetic field when powered on and stop generating a magnetic field (i.e., remove the magnetic field) when powered off. The magnetic plate 44 includes gadolinium or a gadolinium compound having a magnetocaloric effect. The heat storage plate 43 is a conventional ceramic or metal copper plate having relatively good thermal conductivity.

[0040] 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.

[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. Specifically, in the direction from the heat sink 45 to the heat exchange chamber 46, the heat storage plates 43 and the magnetic plates 44 are alternately arranged in sequence, and for any magnetic plate 44, a heat storage plate 43 is arranged on both sides thereof, wherein one heat storage plate 43 is the heat storage plate 43 close to the side of the heat exchange chamber 46, and the other is the heat storage plate 43 away from the side of the heat exchange chamber 46.

[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 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 conducive to dust prevention and dehumidification. Preferably, the heat storage plate 43 in the present application does not move at all, and the outer edge of the heat storage plate 43 can be fixedly connected to the inner wall of the box body 41, or even connected as one, which can also better ensure the sealing performance.

[0043] Preferably, a power unit 47 is provided on the outer wall of the box body 41, and the output end of the power unit 47 can penetrate the box body 41 through a heat-insulating connecting rod 48 and is connected to the magnetic plate 44, 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 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. 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 does not contact with the heat storage plate 43 on the other side, thereby ensuring that the magnetic plate 44 contacts with 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] A ball assembly 49 is disposed on the bottom plate 411 of the box body 41, and a sleeve (not shown in the figure) is disposed 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 ensures that the bottom of the magnetic plate 44 is in point contact with the ball assembly 49, with low running resistance and low noise.

[0051] 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.

[0052] 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.

[0053] 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 easy to break or damage, and at the same time, the contact area between the ball 492 and the reinforcing ribs 4912 is small, further reducing the rolling resistance.

[0054] 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.

[0055] 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 and guide the installation of the assembly structure, thereby improving 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.

[0056] 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, avoid uneven force, and will not interfere with the assembly of other structures. For example, 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.

[0057] The heat exchange chamber 46 can be formed integrally with the box body 41, or in other words, the heat exchange chamber 46 and the box body 41 share a side wall structure, so that the heat exchange chamber 46 can directly fit with the heat storage plate 43 in the box body 41 adjacent to the heat exchange chamber 46, and accordingly, the refrigerant in the heat exchange chamber 46 can directly transfer heat with the heat storage plate 43 in the box body 41 adjacent to the heat exchange chamber 46 to improve the refrigeration efficiency. The heat exchange chamber 46 has a heat exchange cavity 461, and the inner wall of the heat exchange chamber 46 is provided with a plurality of heat exchange fins 462 to improve the refrigeration efficiency of the refrigerant. Accordingly, the heat sink 45 can also be provided with a fin structure to improve the heat dissipation efficiency, and the heat sink 45 can also be a side wall structure of the box body 41, and fit with the heat storage plate 43 in the box body 41 adjacent to the heat sink 45 to transfer heat.

[0058] The outlet of the heat exchange bin 46 is connected to the liquid inlet of the heat dissipation chamber through a liquid inlet pipeline, and the inlet of the heat exchange bin 46 is connected to the liquid outlet of the heat dissipation chamber through a liquid return pipeline. Thus, the refrigerant medium cooled and cooled in the heat exchange bin 46 can enter the heat dissipation chamber to cool the battery module, and can return to the heat exchange bin 46 through the liquid return pipeline. Accordingly, an infusion pump is provided at the outlet and / or inlet of the heat exchange bin 46 to drive the flow of the refrigerant medium. Specifically, in addition to the conventional charging circuit, the charging gun may also be integrated with a liquid inlet pipeline and a liquid return pipeline. The heat dissipation chamber is provided with a liquid inlet pipeline and a liquid outlet pipeline. After the charging gun is connected to the charging port of the electric vehicle, the liquid inlet pipeline is connected to the liquid inlet pipeline, and the liquid return pipeline is connected to the liquid outlet pipeline.

[0059] The charging pile includes a central controller, and the battery module has a detection unit, which includes at least a battery charge detector and a temperature sensor. After the charging gun is connected to the electric vehicle, the central controller can be connected to the detection unit, at least for real-time acquisition of the temperature T1 of the battery module. Correspondingly, the central controller can also obtain whether the charging gun is connected to the electric vehicle, which can be referred to the prior art and will not be elaborated. Of course, the charging pile can also include an ambient temperature sensor, and the central controller is connected to the ambient temperature sensor to detect the external ambient temperature in real time.

[0060] In addition, the charging pile includes an AC power supply, a first converter, and a second converter. The AC power supply is connected to the input end of the first converter through the charging main line group 1, and the output end of the first converter is connected to the charging gun; the AC power supply is connected to the input end of the second converter through the auxiliary line group 2, and the output end of the second converter is connected to the magnetic field application module 42. Therefore, the present application can transform the charging line of the conventional charging pile. On the basis of maintaining the existing charging line structure, the auxiliary line group 2 and the second converter connected in parallel with the first converter are additionally provided. On the basis of not affecting normal charging, the charging pile itself is used to power the magnetic field application module 42. Among them, the first converter and the second converter are both conventional AC-DC converters, which input AC power from their input ends and can output DC power of specific specifications from their output ends.

[0061] Preferably, the charging main line group 1 is provided with a first switch 11, and the secondary line group 2 is provided with a second switch 21, so that during the charging process of the charging pile, the magnetic field application module 42 can be operated periodically by intermittently opening and closing the second switch 21, and the charging pile will not be affected in charging the electric vehicle through the charging main line group 1.

[0062] Furthermore, the output end of the second converter is connected to the magnetic field application module 42 through the third line 3, and the output end of the second converter is connected to the power unit 47 through the fourth line 5, and the third line 3 is provided with a third switch 31. Thus, the periodic operation of the magnetic field application module 42 and the periodic movement of the magnetic plate 44 can be realized respectively without interfering with the normal charging of the charging pile. Among them, the central controller is connected to the first switch 11, the second switch 21, and the third switch 31, and is used to control the opening and closing of the corresponding switches.

[0063] Based on the above charging pile, the present application further proposes a charging method for the charging pile, comprising:

[0064] S1, obtaining a charging start signal, closing the first switch 11, and performing a normal charging process;

[0065] 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.

[0066] 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 11 and performing step S2; if not, reminding that the charging gun is abnormally connected; thereby preventing the user from failing to normally connect the charging gun to the charging port of the electric vehicle.

[0067] S2, real-time detection of the temperature T1 of the battery module;

[0068] S3, determine whether T1 is greater than the first preset value K1; if so, proceed to step S4; if not, return to step S2;

[0069] Among them, since the performance and safety requirements of batteries of different specifications are often different, K1 in this application is a preset temperature value, which is not specifically limited in this application, and is only exemplified by individual numbers, for example: K1 is about 35°C. Correspondingly, when T1≤K1, or in the process of returning to step S2, regardless of whether the heat dissipation device 4 is in the running state, the heat dissipation device 4 is maintained or adjusted to the shutdown state, and the second switch 21 and the third switch 31 are both disconnected, and the infusion pump of the heat exchange chamber 46 is also the same.

[0070] S4, start the infusion pump of the heat exchange chamber 46, close the second switch 21, keep the third switch 31 open, and the power unit 47 drives the magnetic plate 44 to contact the heat storage plate 43 close to the side of the heat exchange chamber 46, and count the closing time P1 of the second switch 21;

[0071] In step S4 , the magnetic plate 44 is in contact with the heat storage plate 43 near the heat exchange chamber 46 and can absorb the heat carried by the heat storage plate 43 . At this time, the magnetic field applying module 42 does not provide a magnetic field to the magnetic plate 44 .

[0072] S5, determine whether P1 is greater than the first time length Q1; if so, reset P1 to zero and proceed to step S6; if not, maintain the current state and re-execute step S5;

[0073] S6, the power unit 47 drives the magnetic plate 44 to fit with the heat storage plate 43 on the side away from the heat exchange chamber 46, and at the same time closes the third switch 31, and the magnetic field applying module 42 provides a magnetic field to the magnetic plate 44, and the closing time P2 of the third switch 31 is timed;

[0074] In step S6 , the magnetic plate 44 is attached to the heat storage plate 43 away from the heat exchange chamber 46 , and the magnetic field applying module 42 provides a magnetic field to the magnetic plate 44 , and the magnetic plate 44 transfers heat to the attached heat storage plate 43 .

[0075] S7, determine whether P2 is greater than the second time length Q2; if so, reset P2 to zero and return to step S2; if not, maintain the current state and re-execute step S7.

[0076] Among them, the first duration Q1 and the second duration Q2 are both preset time data, which will be affected by multiple factors such as thermal conductivity of different materials, component size specifications, contact area, etc. This application does not make specific limitations on their specific data, but only uses individual numbers as examples, for example: Q1 is about 4 minutes, and Q2 is about 3 minutes.

[0077] Therefore, the present application uses the charging method to detect the temperature T1 of the battery module in real time during the charging process of the charging pile for the electric vehicle. When the battery module needs to be cooled, the magnetic field application module 42 and the magnetic plate 44 can be automatically adjusted to cool the refrigerant in the heat exchange bin 46, and the refrigerant is sent to the heat dissipation chamber to cool the battery module in time, so that the battery module can be in an optimal charging temperature range. At the same time, the intelligent and automatic degree of temperature control of the battery module by the charging pile during the charging process is also improved.

[0078] Since the application scenarios and environments of charging piles vary, in order to further improve the intelligence and precision of cooling the battery module during the charging process, the present application further improves step S3.

[0079] Specifically, step S3 includes:

[0080] S311, real-time detection of external environment temperature T2;

[0081] S312, determine whether T2 is less than the first temperature value X1; if so, proceed to step S314; if not, proceed to step S313;

[0082] S313, determine whether T2 is greater than the second temperature value X2; if so, proceed directly to step S4; if not, proceed to step S316;

[0083] S314, determine whether T1 is greater than K1; if so, proceed to step S315; if not, return to step S2;

[0084] S315, determine 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;

[0085] S316, 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.

[0086] 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 batteries 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 35°C, K2 is 10°C / min, K3 is 40°C, and K4 is 50°C.

[0087] Correspondingly, in the process of returning to step S2, no matter whether the heat dissipation device 4 is in the running state or not, the heat dissipation device 4 is kept or adjusted to the shutdown state, and the second switch 21 and the third switch 31 are both disconnected.

[0088] 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 battery module. Accordingly, even if T1>K1, there is no need to start the heat dissipation device 4 immediately. The temperature change of T1 or whether T is greater than K3 can be used to determine whether to start the heat dissipation device 4. 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 and refrigeration control of the battery module by the charging pile during the charging process.

[0089] 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 4 is directly started to dissipate heat and cool the battery module in time, suppress the temperature rise trend of the battery module in time and as early as possible, and avoid the lagging operation of "dissipating heat after the battery temperature reaches a certain level".

[0090] 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 starts the heat dissipation device 4 when T1+T2>K4, so that when the external ambient temperature is slightly lower, the start of the heat dissipation device 4 can be appropriately delayed, and when the external ambient temperature is slightly higher, the heat dissipation device 4 can be appropriately started in advance, so that in the range of suitable ambient temperature, the heat dissipation device 4 can be intelligently controlled in combination with the current external ambient temperature, which is also beneficial to improving the accuracy of the heat dissipation control of the battery module by the charging pile during the charging process.

[0091] The refrigerant medium in this application is perfluorohexanone, which has a melting point of -108°C and a boiling point of 49°C. It can always maintain good fluidity in most areas of the year under weather conditions, and can also provide a certain high temperature warning limit for the heating of the battery module; at the same time, perfluorohexanone has good fire extinguishing ability and can also be used for fire prevention and fire extinguishing in extreme cases. Preferably, a buffer tank is provided in the return liquid pipeline, and a pressure gauge is provided on the top of the buffer tank. The central controller is connected to the pressure gauge to detect the pressure P in the buffer tank. On the one hand, the charging pile can store a certain amount of refrigerant medium. On the other hand, even when the temperature of the battery module is high, the partially vaporized perfluorohexanone can be sent to the buffer tank for buffering to avoid directly pouring into the heat exchange bin 46 to ensure the normal heat exchange process of the heat exchange bin 46.

[0092] In the process of cooling the battery module by the heat dissipation device 4 through perfluorohexanone, perfluorohexanone can also be used to provide a high temperature warning for the heating of the battery module. Specifically, the present application improves step S3, or in other words, adds a warning method based on step S3.

[0093] Step S3 includes:

[0094] S301, determine whether T1 is greater than a first preset value K1; if so, proceed to step S302; if not, return to step S2;

[0095] S302, real-time detection of the pressure P in the buffer tank;

[0096] S303, determine whether P is greater than the warning pressure M1; if so, proceed to step S304; if not, maintain the charging process and proceed to step S4;

[0097] S304, determine whether P is greater than the safety pressure M2; if so, suspend charging and give an alarm; if not, reduce the charging power and proceed to step S4.

[0098] Among them, M1<M2; M1 and M2 are both preset pressure values. Affected by different factors such as the air tightness of the device and the safety level requirements, this application does not specifically limit the specific data, but only uses individual numbers for distance, for example: M1 is 1.2 standard atmospheric pressures, and M2 is 1.5 standard atmospheric pressures.

[0099] Although the boiling point of perfluorohexanone is 49°C, which is higher than the suitable charging temperature range of conventional batteries, in some extremely hot weather or when the battery temperature surges or the battery catches fire, perfluorohexanone will be partially or completely gaseous in the buffer tank after cooling the battery module, causing the pressure in the buffer tank to increase. For this reason, after the charging starts, in addition to automatically adjusting the operation of the infusion pump of the magnetic field application module 42, the magnetic plate 44, and the heat exchange chamber 46, the application also monitors and analyzes the pressure P in the buffer tank in real time. Once P exceeds M2, it means that the temperature at the battery module is too high, and there may be a risk of fire. The charging pile suspends charging and alarms; if P is between M1 and M2, it means that the battery module temperature is too high. The charging power can be appropriately reduced while keeping the charging as much as possible to reduce the heat generated by the battery module and avoid further increase in the battery module temperature. Therefore, in the process of cooling the battery module by the heat dissipation device 4 through the refrigerant medium (perfluorohexanone), the present application can also warn of the heating condition of the battery module according to the state of the refrigerant medium, and automatically adjust the corresponding charging condition. While cooling the battery module, it is beneficial to improve the safety of the battery module during the charging process and reduce the risk of excessive battery temperature and battery fire due to certain abnormal conditions.

[0100] In the present invention, any charging pile may include the technical solution related to the charging pile described in this embodiment; based on the technical solution provided in this application, the charging pile also includes conventional components of the charging pile including a shell, a communication module or a human-computer interaction module. Since these conventional components can refer to the prior art, they will not be described in detail here.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A charging pile, characterized in that: The charging pile comprises a heat dissipation device (4) and a charging gun. The heat dissipation device (4) comprises a box (41), a heat storage plate (43), and a magnetic plate (44). A heat dissipation plate (45) is arranged at one end of the box (41), and a heat exchange chamber (46) is arranged at the other end. The heat storage plate (43) and the magnetic plate (44) are located in the box (41) and are arranged at intervals from each other. A magnetic field application module (42) is 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 contact the heat storage plates (43) arranged adjacent to each other on both sides, and is used to cool and reduce the temperature of the refrigerant in the heat exchange chamber (46). A heat dissipation chamber is arranged on the outer wall of the battery module of the electric vehicle. The heat exchange chamber (46) is connected to the heat dissipation chamber through the charging gun, and is used to supply the refrigerant to the heat dissipation chamber.

2. A charging pile according to claim 1, characterized in that: A power unit (47) is disposed on the outer wall of the box body (41), and an output end of the power unit (47) penetrates the box body (41) through a heat-insulating connecting rod (48) and is connected to the magnetic plate (44), so as to drive the magnetic plate (44) to rotate forward or reverse and selectively contact one of the heat storage plates (43) on the adjacent two sides.

3. A charging pile according to claim 2, 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 connecting with the heat-insulating connecting rod (48). The projected lengths of the first end plate (441) and the second end plate (442) on the horizontal plane are respectively denoted as L1 and L2, wherein L1<L2.

4. A charging pile according to claim 3, 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.

5. A charging pile according to claim 4, characterized in that: The first end plate (441) comprises first side wall surfaces (4411) arranged opposite to each other, the two first side wall surfaces (4411) are both arranged vertically and the planes on which they are located form an angle α3, wherein α1<α3<α2.

6. A charging pile according to claim 1, characterized in that: The heat exchange chamber (46) is fitted with the heat storage plate (43) in the box (41) that is closest to the heat exchange chamber (46); and the heat dissipation plate (45) is fitted with the heat storage plate (43) in the box (41) that is closest to the heat dissipation plate (45).

7. A charging pile according to claim 1, characterized in that: A liquid inlet pipeline and a liquid return pipeline are provided in the charging gun, the outlet of the heat exchange chamber (46) is connected to the liquid inlet of the heat dissipation chamber through the liquid inlet pipeline, and the inlet of the heat exchange chamber (46) is connected to the liquid outlet of the heat dissipation chamber through the liquid return pipeline; an infusion pump is provided at the outlet and / or inlet of the heat exchange chamber (46) for driving the flow of the refrigerant.

8. A charging pile according to claim 1, characterized in that: The charging pile comprises an AC power supply, a first converter and a second converter; the AC power supply is connected to the input end of the first converter via a charging main line group (1), and the output end of the first converter is connected to a charging gun; the AC power supply is connected to the input end of the second converter via a secondary line group (2), and the output end of the second converter is connected to a magnetic field application module (42); the charging main line group (1) is provided with a first switch (11), and the secondary line group (2) is provided with a second switch (21).

9. A charging pile according to claim 8, characterized in that: The output end of the second converter is connected to the magnetic field application module (42) via a third line (3), the output end of the second converter is connected to the driver (4) via a fourth line (5), and the third line (3) is provided with a third switch (31).

10. A charging control method for a charging pile, characterized in that: The charging control method is applied to the charging pile according to any one of claims 1 to 9, and the charging control method comprises: S1, obtaining a charging start signal and closing a first switch (11); S2, real-time detection of the temperature T1 of the battery module; 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, starting the infusion pump of the heat exchange chamber (46), closing the second switch (21), keeping the third switch (31) open, the power unit (47) driving the magnetic plate (44) to contact the heat storage plate (43) close to the side of the heat exchange chamber (46), and timing the closing time P1 of the second switch (21); S5, determine whether P1 is greater than the first time length Q1; if so, reset P1 to zero and proceed to step S6; if not, maintain the current state and re-execute step S5; S6, the power unit (47) drives the magnetic plate (44) to fit with the heat storage plate (43) on the side away from the heat exchange chamber (46), and at the same time closes the third switch (31), the magnetic field application module (42) provides a magnetic field to the magnetic plate (44), and the closing time P2 of the third switch (31) is timed; S7, determine whether P2 is greater than the second time length Q2; if so, reset P2 to zero and return to step S2; if not, maintain the current state and re-execute step S7.

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