Charging pile and charging method

Abstract

The invention provides a charging pile and a charging method.The charging pile comprises a magnetic cooling device, a heat exchange bin and a charging gun, one end of the magnetic cooling device communicates with a low-temperature part, the other end of the magnetic cooling device is connected with the heat exchange bin, and the magnetic cooling device comprises a magnetic field generator, N magnetized parts and N + 1 heat conduction parts; one magnetized part is arranged between any two adjacent heat conduction parts, the magnetic field generator can periodically provide a magnetic field for the magnetized parts, and the magnetized parts can be periodically and alternately attached to the adjacent heat conduction parts on the two sides so as to cool a refrigerating medium in the heat exchange bin; a heat dissipation cavity is formed in the outer wall of a battery module of the electric vehicle, and the heat exchange bin communicates with the heat dissipation cavity through a charging gun and is used for supplying a refrigerating medium to the heat dissipation cavity. In the charging process of the electric vehicle, a good cooling effect can be provided for the battery module of the electric vehicle, and the temperature is prevented from being too high when the battery is charged; and meanwhile, vibration or noise can be effectively reduced in the whole cooling and refrigerating 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 method. 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 provide a charging pile and a charging method 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 includes a magnetic cooling device, a heat exchange bin, and a charging gun. One end of the magnetic cooling device is connected to a low-temperature part, and the other end is connected to the heat exchange bin. The magnetic cooling device includes a magnetic field generator, N magnetized parts and N+1 heat conducting parts, where N is a positive integer. In the direction from the heat exchange bin to the low-temperature part, the heat conducting parts and the magnetized parts are arranged in sequence, and a magnetized part is arranged between any two adjacent heat conducting parts. The magnetic field generator can periodically provide and remove magnetic fields to the magnetized parts. The magnetized parts can periodically alternately fit with adjacent heat conducting parts on both sides to cool the refrigerant medium in the heat exchange bin. A heat dissipation chamber is arranged on the outer wall of a battery module of the electric vehicle. The heat exchange bin is connected to the heat dissipation chamber through a charging gun for supplying refrigerant medium to the heat dissipation chamber.

[0009] Furthermore, for the heat-conducting parts on both sides of any one of the magnetized parts, the heat-conducting part closer to the heat exchange bin is recorded as the first heat-conducting part, and the heat-conducting part closer to the low-temperature part is recorded as the second heat-conducting part; the magnetized part moves toward the direction close to the heat exchange bin until it is in contact with the first heat-conducting part, and the magnetic field generator removes the magnetic field from the magnetized part; the magnetized part moves toward the direction away from the heat exchange bin until it is in contact with the second heat-conducting part, and the magnetic field generator provides a magnetic field to the magnetized part.

[0010] Furthermore, the magnetic cooling device includes a driver, which is connected to the magnetically receiving component and is used to drive the magnetically receiving component to move toward or away from the heat exchange chamber.

[0011] Furthermore, the driver is provided with a driving rod, and the driving rod is connected to any one of all the magnetized parts, and a connecting rod is provided between any two adjacent magnetized parts.

[0012] 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 to the liquid inlet of the heat dissipation chamber through the liquid inlet pipeline, and the inlet of the heat exchange bin is connected to the liquid outlet of the heat dissipation chamber through the liquid return pipeline.

[0013] Furthermore, a buffer tank is provided in the liquid return pipeline, and a pressure gauge is provided on the top of the buffer tank.

[0014] Furthermore, the heat-conducting component closest to the heat exchange bin is integrally formed with the heat exchange bin; and 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 generator; 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 generator through a third line, the output end of the second converter is connected to the driver through a fourth line, and the third line is provided with a third switch.

[0017] A charging method for a charging pile, applied to the charging pile, the charging 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; S4, starting an infusion pump of a heat exchange chamber, closing a second switch, keeping a third switch open, a driver driving a magnetic receiving member to move toward a direction close to the heat exchange chamber until it is in contact with a first heat conducting member, and timing the closing time P1 of the second switch; 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 driver drives the magnetic component to move in the direction away from the heat exchange chamber until it is in contact with the second heat conducting component, and at the same time closes the third switch, and the magnetic field generator provides a magnetic field to the magnetic component, and times the closing time P2 of the third switch; 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.

[0018] Compared with the prior art, the charging pile and charging method described in the present invention have the following advantages:

[0019] The charging pile and charging method described in the present invention can achieve the goal that the coldness of the low-temperature part can be "transported" to the heat exchange bin step by step and successively, so as to cool 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, so as to provide a good cooling effect for the battery module of the electric vehicle and avoid the battery from being overheated during charging. In addition, in the present application, during the entire cooling process, the magnetic component performs periodic reciprocating movement and the magnetic field generator periodically provides a magnetic field, which can effectively reduce the generation of vibration or noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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:

[0021] Figure 1 This is a schematic diagram of an application scenario of a charging pile according to an embodiment of the present invention when charging an electric vehicle;

[0022] Figure 2 This is a schematic diagram of the structure of a magnetic cooling device and a heat exchange chamber in a charging pile according to an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of an operating state of the magnetic cooling device according to an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of another operating state of the magnetic cooling device according to an embodiment of the present invention;

[0025] Figure 5 Another structural schematic diagram of the magnetic cooling device and the heat exchange chamber according to an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the circuit structure of a charging pile according to an embodiment of the present invention;

[0027] Figure 7 This is another schematic diagram of the circuit structure of a charging pile described in an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1. Magnetic component; 2. Heat-conducting component; 2a. First heat-conducting component; 2b. Second heat-conducting component; 3. Magnetic field generator; 4. Driver; 41. Driving rod; 42. Connecting rod; 5. Heat exchange chamber; 51. Heat exchange cavity; 52. Heat exchange fins; 6. Charging main line group; 61. First switch; 7. Auxiliary line group; 71. Second switch; 8. Third line; 81. Third switch; 9. Fourth line. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0033] 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 1-7As shown, the charging pile includes a magnetic cooling device, a heat exchange chamber 5, and a charging gun. One end of the magnetic cooling device is connected to the low temperature part, and the other end is connected to the heat exchange chamber 5. The magnetic cooling device includes a magnetic field generator 3, N magnetic receiving parts 1 and N+1 heat conducting parts 2, where N is a positive integer; in the direction from the heat exchange chamber 5 to the low temperature part, the heat conducting parts 2 and the magnetic receiving parts 1 are arranged in sequence, and a magnetic receiving part 1 is arranged between any two adjacent heat conducting parts 2. The magnetic field generator 3 can periodically provide a magnetic field and remove a magnetic field to the magnetic receiving part 1 (removing the magnetic field can be understood as not providing a magnetic field). The magnetic receiving part 1 can move in a direction close to or away from the heat exchange chamber 5, and periodically alternately fit with the adjacent heat conducting parts 2 on both sides to transfer the cold of the low temperature part to the refrigerant in the heat exchange chamber 5; a heat dissipation chamber is arranged on the outer wall of the battery module of the electric vehicle, and the heat exchange chamber 5 is connected to the heat dissipation chamber through a charging gun for supplying a refrigerant to the heat dissipation chamber.

[0034] The low-temperature part of the present application can be the external environment (air) of the charging pile, and of course it can also be other low-temperature objects.

[0035] The magnetic component 1 described in the present application is a magnetic material, which utilizes the property that the magnetic material becomes hot when magnetized under the action of the magnetic field and becomes cold when demagnetized; for the convenience of description, for the heat-conducting parts 2 on both sides of any magnetic component 1, the heat-conducting part 2 closer to the heat exchange chamber 5 is recorded as the first heat-conducting part 2a, and the heat-conducting part 2 closer to the low-temperature part is recorded as the second heat-conducting part 2b.

[0036] The magnetized component 1 is moved toward the direction close to the heat exchange chamber 5 and fits with the first heat conductor 2a, and the magnetic field generator 3 removes the magnetic field from the magnetized component 1. The magnetized component 1 becomes cold during the demagnetization process and can absorb the heat of the first heat conductor 2a; the magnetized component 1 is moved toward the direction away from the heat exchange chamber 5 and fits with the second heat conductor 2b, and the magnetic field generator 3 provides a magnetic field to the magnetized component 1. The magnetized component 1 transfers the heat it carries to the second heat conductor 2b while being magnetized, and then the magnetized magnetized component 1 is moved toward the heat exchange chamber 5 again to fit with the first heat conductor 2a, and the magnetic field generator 3 removes the magnetic field from the magnetized component 1, and the cycle repeats; it should be noted that the heat conductor 2 closest to the heat exchange chamber 5 can directly transfer the cold to the heat exchange chamber 5, and the heat conductor 2 closest to the low temperature part directly transfers the heat to the low temperature part. Thus, the heat is transferred from the heat exchange chamber 5 to the low temperature part, or the cold is transferred from the low temperature part to the heat exchange chamber 5.

[0037] This process enables the coldness of the low-temperature part to be "transported" to the heat exchange chamber 5 step by step and successively, thereby cooling the refrigerant medium in the heat exchange chamber 5. During the charging process of the electric vehicle, the heat exchange chamber 5 can deliver the refrigerant medium into the heat dissipation chamber through the charging gun, thereby providing a good cooling effect for the battery module of the electric vehicle and avoiding excessive temperature during charging of the battery. In addition, in the entire cooling process, the present application only has the magnetic component 1 performing periodic reciprocating movement and the magnetic field generator 3 providing a magnetic field periodically, which can effectively reduce the generation of vibration or noise.

[0038] The magnetic field generator 3 is 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 receiving part 1 includes gadolinium or a gadolinium compound having a magnetocaloric effect. The heat conducting part 2 is a conventional ceramic or metal copper part, etc., which has relatively good thermal conductivity.

[0039] The magnetic cooling device includes a driver 4, which is connected to the magnetized component 1 and is used to drive the magnetized component 1 to move toward or away from the heat exchange chamber 5. Each magnetized component 1 may correspond to a driver 4, and the movement of each magnetized component 1 may be driven individually; or all magnetized components 1 may be driven by a driver 4. The driver 4 may be a conventional motor capable of driving linear motion, an electric telescopic push rod mechanism, or a hydraulic telescopic push rod mechanism.

[0040] Preferably, the driver 4 is provided with a driving rod 41, and the driving rod 41 is connected to any one of all the magnetized parts 1, and a connecting rod 42 (attached) is provided between any two adjacent magnetized parts 1. Figure 5 The magnetic receiving member 1 connected to the driving rod 41 can be any magnetic receiving member 1, and is not limited to the magnetic receiving member 1 in the appendix of this application. Figure 5 In the actual production process, the driving rod 41 can be connected to which magnetic component 1 according to design factors such as assembly difficulty and space volume.

[0041] Between any two adjacent magnetized parts 1, one end of the connecting rod 42 is connected to the magnetized part 1 relatively close to the heat exchange chamber 5, and the other end passes through the heat conductive part 2 between the two magnetized parts 1 and is connected to the magnetized part 1 relatively far from the heat exchange chamber 5. Accordingly, the heat conductive part 2 between the two magnetized parts 1 is provided with an avoidance hole to avoid spatial interference with the connecting rod 42, while also ensuring the normal movement of the magnetized part 1.

[0042] The charging pile includes a heat-insulating shell (not shown), the magnetic cooling device is arranged in the heat-insulating shell, the heat-conducting member 2 is fixedly connected to the inner wall of the heat-insulating shell, and at least one sliding rail is arranged on the inner wall of the heat-insulating shell, and the extension direction of the sliding rail is parallel to the direction from the heat exchange bin 5 to the low-temperature part, and the magnetic component 1 can move along the sliding rail. Therefore, on the one hand, the magnetic cooling device can "transport" the heat of the heat exchange bin 5 to the low-temperature part in a direction, thereby preventing the heat from escaping to the surroundings of the magnetic cooling device, and on the other hand, the magnetic component 1 can reciprocate relatively smoothly in the heat-insulating shell, which can effectively prevent the magnetic cooling device from generating noise or vibration during operation. Preferably, a sliding rail is arranged between any two adjacent heat-conducting members 2, and one end of the sliding rail is connected to one heat-conducting member 2, and the other end is connected to the other heat-conducting member 2.

[0043] The heat-conducting member 2 closest to the heat-exchange bin 5 is integrally formed with the heat-exchange bin 5, or in other words, the heat-conducting member 2 closest to the heat-exchange bin 5 can be a side wall structure of the heat-exchange bin 5, so that the refrigerant in the heat-exchange bin 5 can directly transfer heat with the heat-conducting member 2 to improve the refrigeration efficiency. The heat-exchange bin 5 has a heat-exchange cavity 51, and the inner wall of the heat-exchange bin 5 is provided with a plurality of heat-exchange fins 52 to improve the refrigeration efficiency of the refrigerant. In addition, the heat-conducting member 2 closest to the low-temperature portion can also be provided with a fin structure to increase the heat exchange area between the magnetic cooling device and the low-temperature portion and improve the heat exchange efficiency.

[0044] The outlet of the heat exchange bin 5 is connected to the liquid inlet of the heat dissipation chamber through a liquid inlet pipeline, and the inlet of the heat exchange bin 5 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 5 can enter the heat dissipation chamber to cool the battery module, and can return to the heat exchange bin 5 through the liquid return pipeline. Correspondingly, an infusion pump is provided at the outlet and / or inlet of the heat exchange bin 5 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.

[0045] The charging pile includes a central controller, and the battery module has a detection unit, which includes at least a battery power 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 to at least obtain the temperature T1 of the battery module in real time; accordingly, the central controller can also obtain whether the charging gun is connected to the electric vehicle, which can be referred to the existing technology and will not be described in detail. 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.

[0046] 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 6, 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 7, and the output end of the second converter is connected to the magnetic field generator 3. 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 7 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 generator 3. 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.

[0047] Preferably, the charging main line group 6 is provided with a first switch 61, and the secondary line group 7 is provided with a second switch 71, so that during the charging process of the charging pile, the magnetic field generator 3 can be operated periodically by intermittently opening and closing the second switch 71, and the charging of the electric vehicle by the charging pile through the charging main line group 6 is not affected.

[0048] Furthermore, the output end of the second converter is connected to the magnetic field generator 3 through the third line 8, and the output end of the second converter is connected to the driver 4 through the fourth line 9, and the third line 8 is provided with a third switch 81. Thus, the periodic operation of the magnetic field generator 3 and the periodic movement of the magnetic receiving part 1 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 61, the second switch 71, and the third switch 81, and is used to control the opening and closing of the corresponding switches.

[0049] Based on the above charging pile, the present application further proposes a charging method for the charging pile, comprising:

[0050] S1, obtaining a charging start signal, closing the first switch 61, and performing a normal charging process;

[0051] 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.

[0052] 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 61 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.

[0053] S2, real-time detection of the temperature T1 of the battery module;

[0054] S3, determine whether T1 is greater than the first preset value K1; if so, proceed to step S4; if not, return to step S2;

[0055] 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 magnetic cooling device is in operation, the magnetic cooling device is maintained or adjusted to a shutdown state, and the second switch 71 and the third switch 81 are both disconnected, and the same is true for the infusion pump of the heat exchange chamber 5.

[0056] S4, start the infusion pump of the heat exchange chamber 5, close the second switch 71, keep the third switch 81 open, and the driver 4 drives the magnetic receiving member 1 to move toward the heat exchange chamber 5 until it is in contact with the first heat conducting member 2a, and count the closing time P1 of the second switch 71;

[0057] In the state of step S4, the magnetic receiving member 1 is in contact with the first heat conducting member 2a and can absorb the heat carried by the first heat conducting member 2a.

[0058] 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;

[0059] S6, the driver 4 drives the magnetic component 1 to move away from the heat exchange chamber 5 until it is in contact with the second heat conducting component 2b, and at the same time closes the third switch 81, the magnetic field generator 3 provides a magnetic field to the magnetic component 1, and the closing time P2 of the third switch 81 is timed;

[0060] 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.

[0061] 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.

[0062] 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 down, the magnetic field generator 3 and the magnetic receiving part 1 can be automatically adjusted to cool down the refrigerant in the heat exchange bin 5, and the refrigerant is sent into the heat dissipation chamber to cool down 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.

[0063] Furthermore, the refrigerant medium in the present 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 5, so as to ensure the normal heat exchange process of the heat exchange bin 5.

[0064] In the process of cooling the battery module by perfluorohexanone in the magnetic cooling device, 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.

[0065] Step S3 includes:

[0066] S301, determine whether T1 is greater than a first preset value K1; if so, proceed to step S302; if not, return to step S2;

[0067] S302, real-time detection of the pressure P in the buffer tank;

[0068] 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;

[0069] 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.

[0070] 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.

[0071] 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 magnetic field generator 3, the magnetic receiving part 1, and the infusion pump of the heat exchange chamber 5, 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 generation of the battery module and avoid further increase in the battery module temperature. Therefore, in the process of cooling the battery module by perfluorohexanone in the magnetic cooling device, the present application can also warn of the heating condition of the battery module according to the state of perfluorohexanone, 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.

[0072] Since the application scenarios and environments of charging piles vary, in order to further improve the intelligence of cooling the battery module during the charging process of the charging pile, the present application may further improve step S3.

[0073] Specifically, step S3 includes:

[0074] S311, real-time detection of external environment temperature T2;

[0075] S312, determine whether T2 is less than the first temperature value X1; if so, proceed to step S314; if not, proceed to step S313;

[0076] 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;

[0077] S314, determine whether T1 is greater than K1; if so, proceed to step S315; if not, return to step S2;

[0078] 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;

[0079] 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.

[0080] 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.

[0081] Correspondingly, in the process of returning to step S2 , no matter whether the magnetic cooling device is in the running state or not, the magnetic cooling device is kept or adjusted to the shutdown state, and the second switch 71 and the third switch 81 are both disconnected.

[0082] Specifically, when T2 is less than X1, it can be regarded as that the external ambient temperature is low (such as in winter). 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 magnetic cooling device immediately. The temperature change of T1 or whether T is greater than K3 can be used to determine whether to start the magnetic cooling device. Through the two-level judgment process and the corresponding multi-condition analysis, unnecessary starting of the magnetic cooling device at low ambient temperature can be avoided. Frequent starting and stopping of the magnetic cooling device can also be effectively avoided, which is also beneficial to improve the accuracy of the charging pile's heat dissipation and refrigeration control of the battery module during the charging process.

[0083] When T2 is greater than X2, it can be considered that the external ambient temperature is high (such as in summer), and the magnetic cooling device 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 or cooling after the battery temperature reaches a certain level".

[0084] 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 magnetic cooling device when T1+T2>K4, so that when the external ambient temperature is slightly lower, the start of the magnetic cooling device can be appropriately delayed, and when the external ambient temperature is slightly higher, the magnetic cooling device can be appropriately started in advance, so that in the range of suitable ambient temperature, the magnetic cooling device can be intelligently controlled in combination with the current external ambient temperature, which is also beneficial to improve the accuracy of the charging pile's heat dissipation and refrigeration control of the battery module during the charging process.

[0085] 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.

[0086] 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 magnetic cooling device, a heat exchange chamber (5), and a charging gun. One end of the magnetic cooling device is connected to the low temperature part, and the other end is connected to the heat exchange chamber (5). The magnetic cooling device comprises a magnetic field generator (3), N magnetic receiving parts (1) and N+1 heat conducting parts (2), where N is a positive integer. In the direction from the heat exchange chamber (5) to the low temperature part, the heat conducting parts (2) and the magnetic receiving parts (1) are arranged in sequence, and a magnetic receiving part (1) is arranged between any two adjacent heat conducting parts (2). The magnetic field generator (3) can periodically provide a magnetic field to the magnetic receiving parts (1) and remove the magnetic field. The magnetic receiving parts (1) can periodically alternately fit with the adjacent heat conducting parts (2) on both sides to cool the refrigerant in the heat exchange chamber (5). A heat dissipation chamber is arranged on the outer wall of the battery module of the electric vehicle. The heat exchange chamber (5) 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: For the heat-conducting parts (2) on both sides of any magnetized part (1), the heat-conducting part (2) closer to the heat exchange chamber (5) is recorded as the first heat-conducting part (2a), and the heat-conducting part (2) closer to the low-temperature part is recorded as the second heat-conducting part (2b); the magnetized part (1) moves in a direction close to the heat exchange chamber (5) until it fits with the first heat-conducting part (2a), and the magnetic field generator (3) removes the magnetic field from the magnetized part (1); the magnetized part (1) moves in a direction away from the heat exchange chamber (5) until it fits with the second heat-conducting part (2b), and the magnetic field generator (3) provides a magnetic field to the magnetized part (1).

3. A charging pile according to claim 1, characterized in that: The magnetic cooling device comprises a driver (4), wherein the driver (4) is connected to the magnetized component (1) and is used to drive the magnetized component (1) to move in a direction approaching or away from the heat exchange chamber (5).

4. A charging pile according to claim 3, characterized in that: The driver (4) is provided with a driving rod (41), the driving rod (41) is connected to any one of all the magnetized parts (1), and a connecting rod (42) is provided between any two adjacent magnetized parts (1).

5. 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 (5) is connected to the liquid inlet of the heat dissipation chamber via the liquid inlet pipeline, and the inlet of the heat exchange chamber (5) is connected to the liquid outlet of the heat dissipation chamber via the liquid return pipeline.

6. A charging pile according to claim 5, characterized in that: A buffer tank is arranged in the liquid return pipeline, and a pressure gauge is arranged on the top of the buffer tank.

7. A charging pile according to claim 5, characterized in that: The heat-conducting element (2) closest to the heat-exchange chamber (5) is integrally formed with the heat-exchange chamber (5); an infusion pump is provided at the outlet and / or inlet of the heat-exchange chamber (5) to drive the flow of the refrigerant medium.

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 (6), 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 (7), and the output end of the second converter is connected to a magnetic field generator (3); the charging main line group (6) is provided with a first switch (61), and the secondary line group (7) is provided with a second switch (71).

9. A charging pile according to claim 8, characterized in that: The output end of the second converter is connected to the magnetic field generator (3) via a third line (8), the output end of the second converter is connected to the driver (4) via a fourth line (9), and the third line (8) is provided with a third switch (81).

10. A charging method for a charging pile, characterized in that: The charging method is applied to the charging pile according to any one of claims 1 to 9, and the charging method comprises: S1, obtaining a charging start signal and closing a first switch (61); 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 (5), closing the second switch (71), keeping the third switch (81) open, and driving the driver (4) to move the magnetic receiving component (1) toward the heat exchange chamber (5) until it is in contact with the first heat conducting component (2a), and timing the closing time P1 of the second switch (71); 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 driver (4) drives the magnetic receiving component (1) to move in a direction away from the heat exchange chamber (5) until it is in contact with the second heat conducting component (2b), and at the same time closes the third switch (81), the magnetic field generator (3) provides a magnetic field to the magnetic receiving component (1), and the closing time P2 of the third switch (81) 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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