Charging pile

Abstract

The invention provides a charging pile. The charging pile comprises a charging unit and at least one water-cooling radiator which are arranged in a box body, the charging unit comprises an alternating-current power distribution unit, a power conversion unit and at least one power distribution unit which are connected in sequence; wherein the water-cooling radiator is vertically arranged, and the power conversion unit is arranged on a vertical contact surface on the outer side of the water-cooling radiator; and the AC power distribution unit and the power distribution unit are respectively arranged at the top end and the bottom end in the box body, or both the AC power distribution unit and the power distribution unit are arranged at the top end or the bottom end in the box body. Namely, according to the charging pile, the charging units are designed in an integrated mode, heat dissipation is achieved through the water-cooling radiator, unnecessary redundant design in a traditional charging pile is reduced, the protection grade of the charging pile can be high, meanwhile, the cost of the charging pile is reduced, the size of the whole pile can be smaller, and the weight can be lighter.

Description

[0001] This application is a divisional application with application number 202011132542.6, application date October 21, 2020, and invention name “A Charging Pile”. Technical Field

[0002] The present invention belongs to the technical field of charging piles, and more specifically, particularly relates to a charging pile. Background Art

[0003] The power conversion part of traditional DC charging piles is basically designed separately to form a power conversion module, such as using the power conversion module as a black box; different power levels are obtained by connecting different numbers of power conversion modules in parallel, and each power conversion module has its own heat dissipation module. The traditional DC charging pile as a whole also needs to be designed for secondary heat dissipation according to its heat dissipation method; this increases the cost invisibly, and it is difficult to increase the protection level. Moreover, the modular stacking of each power conversion module makes the charging pile costly, and the weight and volume are large. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a charging pile, which is used to integrate various devices in the charging unit of the charging pile as a whole, so that its heat dissipation design is simple, the cost of the charging pile is reduced, the protection level of the charging pile can be higher, and the volume of the whole pile can be made smaller and the weight can be made lighter. The present invention discloses a charging pile, including: a charging unit and at least one water-cooled radiator arranged in a box;

[0005] The charging unit is used to charge the charging device;

[0006] The power conversion unit in the charging unit is arranged on the contact surface outside the water-cooled radiator; when the box body is arranged vertically, the AC power distribution unit and the power distribution unit in the charging unit are arranged on both sides or the same side of the water-cooled radiator in the box body;

[0007] The water-cooled radiator is used to dissipate heat for the charging unit by means of convection heat exchange of the coolant; there is no heat dissipation module inside the power conversion unit.

[0008] Optionally, the charging unit includes: the AC power distribution unit, the power distribution unit and at least one of the power conversion units; wherein:

[0009] The input end of the AC power distribution unit serves as the input end of the charging unit and is used to receive AC power supply energy;

[0010] The output end of the AC power distribution unit is connected to the AC side of the power conversion unit;

[0011] Each DC side of the power conversion unit is correspondingly connected to a plurality of input terminals of the power distribution unit;

[0012] The output end of the power distribution unit serves as the output end of the charging unit.

[0013] Optionally, the AC power distribution unit and the power distribution unit are configured in any one of the following ways:

[0014] The power distribution unit and the AC power distribution unit are respectively arranged at the top and bottom of the box body;

[0015] The power distribution unit and the AC power distribution unit are both arranged at the top or bottom of the box body;

[0016] Of the power distribution unit and the AC power distribution unit, one is located at the front end of the power conversion unit and is arranged at the top end of the box body, and the other is arranged at the bottom end of the box body;

[0017] Of the power distribution unit and the AC power distribution unit, one is located at the front end of the power conversion unit and is arranged at the bottom end of the box body, and the other is arranged at the top end of the box body;

[0018] The power distribution unit and the AC power distribution unit are both located at the front end of the power conversion unit and are respectively placed at the top and bottom ends of the box body.

[0019] Optionally, the water-cooled radiator comprises: a shell and a coolant;

[0020] The contact surface outside the shell is provided with the power conversion unit and is used to conduct the heat of the power conversion unit;

[0021] The coolant is arranged inside the shell, and the flowing coolant is used to take away the heat of the shell.

[0022] Optionally, the power conversion unit includes a plurality of heating elements;

[0023] The heating elements of the power conversion unit are respectively arranged on contact surfaces outside the water-cooling radiator.

[0024] Optionally, the water-cooled radiator is plate-shaped and has two contact surfaces.

[0025] Optionally, the water-cooled radiator is a polygonal column structure; the water-cooled radiator has multiple contact surfaces.

[0026] Optionally, at least one contact surface of the water-cooled radiator is provided with a heating element of the power conversion unit.

[0027] Optionally, when there is at least one contact surface in the water-cooled radiator that is not provided with a heating element, the contact surface in the water-cooled radiator that is not provided with a heating element rests on the back plate of the box.

[0028] Optionally, each contact surface of the water-cooled radiator is provided with a heating element.

[0029] Optionally, the water cooling radiator is placed in the center of the box, or at the mid-axis position.

[0030] Optionally, the power conversion unit includes: a rectifier module and n DC / DC converters; n is an integer greater than 1;

[0031] The AC side of the rectifier module serves as the input end of the power conversion unit;

[0032] The DC side of the rectifier module is respectively connected to the input ends of the n DC / DC converters;

[0033] The output ends of the n DC / DC converters are respectively used as the output ends of the power conversion unit.

[0034] Optionally, the AC power distribution unit includes: a switch unit;

[0035] The three-phase inputs A, B, and C of the AC power supply are connected to the input terminals of the switch units in a one-to-one correspondence;

[0036] The output ends of the switch units serve as output ends of the AC power distribution units respectively.

[0037] Optionally, the switch unit includes: a drive circuit and an AC relay group;

[0038] The input end of the AC relay group is connected as the input end of the switch unit;

[0039] The output end of the AC relay group is connected to the output end of the switch unit;

[0040] The AC relay group is controlled by the driving circuit.

[0041] Optionally, the AC relay group includes: switch subunits respectively arranged on each phase cable in the AC relay group.

[0042] Optionally, the switch subunit includes: at least one relay.

[0043] Optionally, the switch subunit includes: two relays connected in series.

[0044] Optionally, the switch unit further includes: a circuit breaker;

[0045] The circuit breaker is arranged between the input end of the switch unit and the input end of the AC relay group.

[0046] Optionally, the AC power distribution unit further includes: a lightning arrester;

[0047] The three-phase inputs A, B, and C of the AC power supply are grounded through the lightning arrester.

[0048] Optionally, the charging unit further includes: a centralized control unit, configured to:

[0049] Sending a control signal to the AC power distribution unit to enable the AC power distribution unit to be switched on and off;

[0050] sending a PWM signal to the power conversion unit so that the power conversion unit can achieve electric energy conversion; and,

[0051] A control signal is sent to the power distribution unit to enable the power distribution unit to distribute the output power.

[0052] Optionally, the charging unit further includes: a distributed control unit;

[0053] The distributed control unit comprises: a system controller and a plurality of sub-controllers;

[0054] Each of the sub-controllers is communicatively connected to the system controller.

[0055] It can be seen from the above technical solution that the charging pile provided by the present invention includes: a charging unit and at least one water-cooled radiator; the water-cooled radiator and the charging unit are both arranged in a box; the charging unit includes an AC power distribution unit, a power conversion unit and at least one power distribution unit connected in sequence; wherein the water-cooled radiator is arranged vertically, and the power conversion unit is arranged on the vertical contact surface outside the water-cooled radiator; and the AC power distribution unit and the power distribution unit are respectively arranged at the top and bottom of the box, or both are arranged at the top or bottom of the box. That is, the charging pile integrates the charging unit design, and realizes heat dissipation through the water-cooled radiator, reducing unnecessary redundant design in traditional charging piles, so that the protection level of the charging pile can be higher, while reducing the cost of the charging pile, and the volume of the whole pile can be made smaller and the weight can be made lighter. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0057] Figure 1-Figure 6 It is a schematic diagram of the setting position of each unit in a charging pile provided by an embodiment of the present invention;

[0058] Figure 7-Figure 9 is a schematic diagram of a charging pile provided by an embodiment of the present invention;

[0059] Figure 10-Figure 16 It is a schematic diagram of a charging unit in a charging pile provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0062] This embodiment provides a charging pile for solving the problem that in the prior art, each power conversion module in the charging pile has its own heat dissipation module, and the traditional DC charging pile as a whole also needs to perform secondary heat dissipation design according to its heat dissipation method; this invisibly increases the cost, makes it difficult to increase the protection level, and is heavy and bulky.

[0063] See also Figure 1 The charging pile includes: a charging unit (including Figure 1 1, 2 and 3) and at least one water-cooled radiator 200 as shown.

[0064] The charging unit is used to charge the electrical device; specifically, the charging unit is directly or indirectly connected to the electrical device so that the charging unit can charge the electrical device.

[0065] In actual applications, the charging pile may also include at least one charging gun arranged outside the box 100, and each output end of the charging unit is respectively connected to the corresponding charging gun, which is used to connect to an electrical device, such as an electric car, so that the charging unit can charge the electrical device through the corresponding charging gun.

[0066] The power conversion unit 2 inside the charging unit is arranged on the contact surface outside the water cooling radiator 200; that is, the contact surface outside the water cooling radiator 200 is in contact with the power conversion unit 2, and the power conversion unit 2 and the water cooling radiator 200 can conduct heat conduction. Figure 1 As shown in , the water-cooled radiator 200 is vertically arranged, and the power conversion unit 2 is arranged on the vertical contact surface outside the water-cooled radiator 200 .

[0067] The water-cooled radiator 200 is used to dissipate heat for the charging unit by means of convection heat exchange of the coolant; specifically, the heat of the power conversion unit 2 is conducted to the contact surface of the water-cooled radiator 200; the water-cooled radiator 200 takes away its own heat, thereby achieving heat dissipation for the charging unit.

[0068] It should be noted that the box body 100 may or may not adopt an integral sealing design, which is not specifically limited here and may be determined based on actual conditions, all of which are within the protection scope of this application.

[0069] The power conversion unit 2 in this embodiment does not need to be provided with a heat dissipation module inside. For example, it can be an integrated conversion device realized by connecting multiple DC / DC converters to a rectifier module at the rear stage. That is, this embodiment replaces the multiple power conversion modules in parallel in the prior art with an integrated high-power conversion device, which is arranged on the contact surface outside the water-cooled radiator 200, and dissipates heat directly through the water-cooled radiator 200, thereby avoiding the prior art of designing a heat dissipation module for each power conversion module in the charging pile, and then performing a secondary heat dissipation design for the charging pile as a whole, thereby reducing the cost of the charging pile. In addition, it is no longer necessary to separately set up a corresponding heat dissipation device inside each unit. Therefore, the corresponding unit can be sealed separately or sealed as a whole with other units, thereby making the protection level of the charging pile higher.

[0070] It is worth mentioning that the technical source of the power conversion module in the prior art is the communication power supply, which has relatively strict requirements on the working environment and is easy to fail in an environment of high temperature, high humidity, high salt fog or strong wind and sand; in this embodiment, the charging unit is arranged in a first box with a sealed design, and a water-cooled radiator dissipates heat for the charging unit, thereby avoiding the problem of failure of the charging unit due to being in an environment of high temperature, high humidity, high salt fog or strong wind and sand.

[0071] In the above embodiments, see Fig.10 The charging unit comprises: an AC power distribution unit 1, a power distribution unit 3 and at least one power conversion unit 2; wherein:

[0072] The input end of the AC power distribution unit 1 serves as the input end of the charging unit of the charging pile, and is used to receive AC power supply energy. The output end of the AC power distribution unit 1 is connected to the AC side of the power conversion unit 2; each DC side of the power conversion unit 2 is respectively connected to the multiple input ends of the power distribution unit 3; each output end of the power distribution unit 3 serves as each output end of the charging unit of the charging pile, and is used to connect the corresponding charging gun of the charging pile. Specifically, each output end of the power distribution unit 3 provides power to and charges the corresponding electrical equipment, such as an electric car, through the corresponding charging gun.

[0073] That is to say, the AC power distribution unit 1, at least one power conversion unit 2 and the power distribution unit 3 are electrically connected in sequence.

[0074] In any of the above embodiments, the arrangement positions of the various components in the charging unit may be: the power conversion unit 2 is arranged on the surface of the water-cooled radiator 200 .

[0075] The power distribution unit 3 and the AC power distribution unit 1 are respectively arranged on two sides of the interior of the box 100 , or the power distribution unit 3 and the AC power distribution unit 1 are both arranged on the same side of the interior of the box 100 .

[0076] Specifically, the AC power distribution unit 1 and the power distribution unit 3 are configured in any of the following ways:

[0077] (1) Figure 1 As shown, the power distribution unit 3 and the AC power distribution unit 1 are respectively arranged at the top and bottom of the box body 100. Specifically, as Figure 1 As shown, the power distribution unit 3 is arranged at the top of the box 100, and the AC power distribution unit 1 is arranged at the bottom of the box 100; or, the power distribution unit 3 is arranged at the bottom of the box 100, and the AC power distribution unit 1 is arranged at the top of the box 100. In this case, for the power conversion unit 2, Figure 1As shown in FIG. 1 , the power distribution unit 3 and the AC power distribution unit 1 are respectively arranged on the top or bottom of the power conversion unit 2 .

[0078] (2) Figure 2 and Figure 3 As shown, the power distribution unit 3 and the AC power distribution unit 1 are both arranged at the top or bottom of the box 100; specifically, as Figure 2 As shown, the power distribution unit 3 and the AC power distribution unit 1 are both arranged at the top of the box 100; or, as shown Figure 3 As shown, the power distribution unit 3 and the AC power distribution unit 1 are both arranged at the bottom of the box 100. At this time, for the power conversion unit 2, it can be as follows Figure 2 As shown in , the power distribution unit 3 and the AC power distribution unit 1 are both arranged on the top of the power conversion unit 2; Figure 2 Figure 3 As shown in , the power distribution unit 3 and the AC power distribution unit 1 are both arranged at the bottom of the power conversion unit 2.

[0079] (3) Figure 4 As shown, one of the power distribution unit 3 and the AC power distribution unit 1 is located at the front end of the power conversion unit 2 and is arranged at the top of the box 100, and the other is arranged at the bottom of the box 100. Specifically, the power distribution unit 3 is located at the front end of the power conversion unit 2 and is arranged at the top of the box 100, and the AC power distribution unit 1 is arranged at the bottom of the box 100; or, the AC power distribution unit 1 is located at the front end of the power conversion unit 2 and is arranged at the top of the box 100, and the power distribution unit 3 is arranged at the bottom of the box 100. Figure 4 As shown in , it is located at the front end of the power conversion unit 2, specifically refers to a side of the power conversion unit 2 that is vertical and away from the water-cooled radiator 200.

[0080] (4) Figure 5 As shown, one of the power distribution unit 3 and the AC power distribution unit 1 is located at the front end of the power conversion unit 2 and is arranged at the bottom end inside the box 100, and the other is arranged at the top end inside the box 100; specifically, the power distribution unit 3 is located at the front end of the power conversion unit 2 and is arranged at the bottom end inside the box 100, and the AC power distribution unit 1 is arranged at the top end inside the box 100; or, the AC power distribution unit 1 is located at the front end of the power conversion unit 2 and is arranged at the bottom end inside the box 100, and the power distribution unit 3 is arranged at the top end inside the box 100. Figure 5 As shown in , it is located at the front end of the power conversion unit 2, specifically refers to a side of the power conversion unit 2 that is vertical and away from the water-cooled radiator 200.

[0081] (5) Figure 6As shown, the power distribution unit 3 and the AC power distribution unit 1 are both placed at the front end of the power conversion unit 2 and are respectively placed at the top and bottom of the box 100. Specifically, the power distribution unit 3 is located at the front end of the power conversion unit 2 and is respectively placed at the top of the box 100, and the AC power distribution unit 1 is located at the front end of the power conversion unit 2 and is respectively placed at the bottom of the box 100; or, the power distribution unit 3 is located at the front end of the power conversion unit 2 and is respectively placed at the bottom of the box 100, and the AC power distribution unit 1 is located at the front end of the power conversion unit 2 and is respectively placed at the top of the box 100. Figure 6 As shown in , it is located at the front end of the power conversion unit 2, specifically refers to a side of the power conversion unit 2 that is vertical and away from the water-cooled radiator 200.

[0082] That is, if Figure 1 , Figures 4 to 6 As shown, the AC power distribution unit 1 and the power distribution unit 3 can be respectively arranged at the top and bottom of the box body 100; or, as shown in FIG. Figure 2 As shown in , the AC power distribution unit 1 and the power distribution unit 3 can also be arranged at the top of the box body 100; or, as shown in Figure 3 As shown in , the AC power distribution unit 1 and the power distribution unit 3 can also be arranged at the bottom of the box body 100.

[0083] In this embodiment, the charging unit is integrated to reduce unnecessary redundant designs in traditional charging piles. The entire pile can be made smaller, lighter, and have a higher power density.

[0084] In any of the above embodiments, the water-cooled radiator 200 includes: a shell and a coolant.

[0085] The contact surface on the outside of the shell is provided with a power conversion unit 2 for conducting the heat of the power conversion unit 2; the coolant is provided inside the shell, and the flowing coolant is used to take away the heat of the shell. Specifically, the heat of the power conversion unit 2 is first conducted to the outside of the shell, and then to the inside of the shell. At this time, the coolant provided inside the shell takes away the heat on the inside of the shell; because heat is conductive, it further takes away the heat of the power conversion unit 2. As shown in the figures involved in any of the above embodiments, the power conversion unit 2 is provided on the vertical contact surface on the outside of the shell.

[0086] In this embodiment, the power conversion unit 2 adopts an integral design, and the water-cooled radiator 200 adopts a liquid cooling design to avoid the pain point of the contradiction between internal cooling and protection. The protection level will be significantly improved compared with the traditional solution, and because the liquid cooling effect is better, it is conducive to the improvement of the power level.

[0087] It should be noted that the power conversion unit 2 includes: a plurality of heating elements; each heating element is respectively arranged on each contact surface outside the water-cooling radiator 200 . Figures 1 to 6 The situation shown is equivalent to that each heating element is respectively arranged on a vertical contact surface outside the water-cooling radiator 200. Figures 7 to 9 The situation shown is that each heating element is respectively arranged on at least two vertical contact surfaces on the outside of the water-cooling radiator 200.

[0088] The water-cooled radiator 200 may adopt a double-sided design, that is, it has two contact surfaces for heat exchange; or it may adopt a multi-sided design, that is, it has multiple contact surfaces for heat exchange.

[0089] Specifically, when the water-cooling radiator 200 adopts a double-sided design, Figure 7 As shown, the water-cooled radiator 200 is plate-shaped and has two contact surfaces. Only one of the two contact surfaces of the water-cooled radiator 200 is provided with a heating element (such as Figure 1-Figure 6 Alternatively, heating elements are provided on both contact surfaces (such as Figure 7 The heat of the power conversion unit 2 is respectively conducted to the two contact surfaces; the coolant in the water-cooled radiator 200 takes away the heat in the shell, and then takes away the heat of the two heat dissipation surfaces.

[0090] When at least one contact surface of the water-cooled radiator 200 is not provided with a heating element, a contact surface of the water-cooled radiator 200 not provided with a heating element is placed against the back plate of the box body 100 (eg Figure 1-Figure 6 and, as Figure 1-Figure 6 As shown, at least one other contact surface of the water-cooled radiator 200 is provided with a heating element. When both contact surfaces of the water-cooled radiator 200 are provided with heating elements, the water-cooled radiator 200 is provided at the center of the box body 100, or at the central axis position (such as Figure 7 shown).

[0091] It should be noted that Figure 7 The structure shown is only an example of a double-sided design of the water-cooled radiator 200. There are many ways to configure the power distribution unit 3 and the AC distribution unit 1 in the charging unit. Please refer to the above-mentioned related embodiments for details, which will not be described here one by one. They are all within the protection scope of this application.

[0092] When the water cooling radiator 200 adopts a multi-faceted design, such as Figure 8 and Fig. 9 As shown, the water-cooled radiator 200 is a multi-prism structure; the water-cooled radiator 200 has multiple contact surfaces. Figure 8 The water cooling radiator 200 is a triangular prism structure with three contact surfaces; see Fig. 9The water-cooled radiator 200 is a quadrangular prism structure with four contact surfaces. At least one of the multiple contact surfaces of the water-cooled radiator 200 is provided with a heating element; of course, multiple contact surfaces may also be provided with heating elements. In order to avoid waste of resources of the water-cooled radiator 200 and increase in cost and weight, it is preferred that each contact surface is provided with a heating element.

[0093] When at least one contact surface of the water-cooled radiator 200 is not provided with a heating element, the contact surface of the water-cooled radiator 200 that is not provided with a heating element is against the back plate of the box body 100 (such as Figure 1-Figure 6 When both contact surfaces of the water-cooled radiator 200 are provided with heating elements, the water-cooled radiator 200 is provided at the center of the box body 100, or at the central axis position (such as Figure 7 shown).

[0094] It should be noted that if the number of power conversion units 2 in the charging unit is m, and the number of heating elements in the power conversion unit 2 is h, then the h*m heating elements are respectively arranged on the corresponding contact surfaces. Specifically, all the heating elements in the same power conversion unit 2 are arranged on the same contact surface. All the heating elements in different power conversion units 2 can be arranged on the same contact surface, such as h*m heating elements are arranged on the same contact surface; or, the power conversion unit 2 can be used as a unit, and each power conversion unit 2 can be arranged on a different contact surface, such as m power conversion units 2 corresponding to m contact surfaces one by one, and each power conversion unit 2 is arranged on its corresponding contact surface; the specific setting method of each power conversion unit 2 is not specifically limited here, and it can be determined according to the actual situation, and it is all within the protection scope of this application.

[0095] In this embodiment, multiple contact surfaces are provided with heating elements, thereby increasing the contact area between the power conversion unit 2 and the water-cooled radiator 200 ; and further increasing the heat dissipation speed of the power conversion unit 2 .

[0096] In the above embodiments, see Fig.10 , the specific connection relationship in the charging unit is:

[0097] The input end of the AC power distribution unit 1 serves as the input end of the charging unit of the charging pile, and is used to receive AC power supply energy. The AC power supply energy can be three-phase AC power energy; specifically, the AC distribution unit 1 has three-phase input terminals, namely, an A-phase input terminal, a B-phase input terminal and a C-phase input terminal, which are respectively used as the A-phase input terminal, the B-phase input terminal and the C-phase input terminal of the charging unit of the charging pile; the A-phase input terminal of the AC distribution unit 1 is used to receive the A-phase AC power in the AC power supply energy, the B-phase input terminal of the AC distribution unit 1 is used to receive the B-phase AC power in the AC power supply energy, and the C-phase input terminal of the AC distribution unit 1 is used to receive the C-phase AC power in the AC power supply energy; of course, the AC power supply energy can be other phase AC power energy, such as single-phase, etc., which is not specifically limited here and can be determined according to actual conditions; the illustrated structure in this embodiment and the specific description of the related devices are all illustrated by taking the three-phase AC power supply energy as an example. Under other phase AC power supplies, the illustrations and the specific description of the related devices are similar to the above description and will not be repeated one by one, and they are all within the protection scope of this application.

[0098] The output end of the AC power distribution unit 1 is connected to the AC side of the power conversion unit 2; each DC side of the power conversion unit 2 is connected to a plurality of input ends of the power distribution unit 3 respectively.

[0099] In practical applications, the power conversion unit 2 includes: a rectifier module and n DC / DC converters; n is an integer greater than 1.

[0100] The AC side of the rectifier module serves as the AC side of the power conversion unit 2. Specifically, the AC distribution unit 1 has three-phase output terminals, namely, an A-phase output terminal, a B-phase output terminal, and a C-phase output terminal, and the AC side of the rectifier module also has a three-phase AC side, namely, an AC side A phase, an AC side B phase, and an AC side C phase; the A-phase output terminal of the AC distribution unit 1 is connected to the AC side A phase of the rectifier module, the B-phase output terminal of the AC distribution unit 1 is connected to the AC side B phase of the rectifier module, and the C-phase output terminal of the AC distribution unit 1 is connected to the AC side C phase of the rectifier module.

[0101] The DC side of the rectifier module of the power conversion unit 2 is respectively connected to the input ends of the n DC / DC converters of the power conversion unit 2; that is, one rectifier module can be connected to multiple DC / DC converters. In practical applications, the DC / DC converter can be an isolated DC / DC converter to achieve isolation between the high-voltage grid side and the user side, as well as isolation between two power users during charging, to provide safety for the charging pile.

[0102] The output ends of the n DC / DC converters in the power conversion unit 2 are respectively used as the output ends of the power conversion unit 2 and are respectively connected to the multiple input ends of the power distribution unit 3. In practical applications, the connection relationship between the output ends of the n DC / DC converters of the power conversion unit and the multiple input ends of the power distribution unit is any one of one-to-one correspondence, multiple-to-one and one-to-multiple pairs; specifically, the n output ends of the power conversion unit 2 can be connected to the n input ends of the power distribution unit 3 in a one-to-one correspondence; or at least two output ends of the power conversion unit 2, that is, the output ends of at least two DC / DC converters, are connected to one input end of the power distribution unit 3; specifically, at least two output ends of a power conversion unit 2 are connected in parallel to one input end of the power distribution unit 3, or at least one output end of at least two power conversion units 2 is connected in parallel to one input end of the power distribution unit 3; or one output end of the power conversion unit 2 is connected to multiple input ends of the power distribution unit 3; no specific limitation is made here, it can be determined according to the actual situation, and all are within the protection scope of this application.

[0103] The number of power conversion units 2 can be one (eg Fig.11 As shown), it can also be multiple or two (such as Fig.12 As shown), its specific structure will not be described one by one here, all of which are within the protection scope of this application. It should be noted that if the number of power conversion units 2 in the charging unit is m, and the number of DC / DC converters in one power conversion unit 2 is n, then the number of DC / DC converters in the charging unit is n×m; where m is an integer greater than 0.

[0104] When the number of power conversion units 2 is 1, the AC side of the rectifier module in the power conversion unit 2 is connected to the output end of the AC distribution unit 1, and the output ends of the n DC / DC converters in the power conversion unit 2 are respectively connected to multiple input ends of the power distribution unit 3.

[0105] When the number of power conversion units 2 is not 1, the AC side of the rectifier module in each power conversion unit 2 is connected to the output end of the AC distribution unit 1, and the output ends of the n DC / DC converters in each power conversion unit 2, that is, the output ends of the n×m DC / DC converters are respectively connected to the multiple input ends of the power distribution unit 3.

[0106] The output ends of the power distribution unit 3 are respectively used as the output ends of the charging unit of the charging pile, and are used to charge the electrical equipment; specifically, the output ends of the power distribution unit 3 are connected to the charging gun of the charging pile, and the output ends of the power distribution unit 3 are connected to the corresponding electrical equipment, such as an electric car, through the corresponding charging gun, so that the power distribution unit 3 provides charging power for the corresponding electrical equipment.

[0107] In practical applications, the power distribution unit 3 includes: a multi-way switch, so that the multi-way input electric energy of the power distribution unit 3 can be output in an independent or series-parallel form. That is to say, the power distribution unit 3 can integrate or directly output the electric energy at its input end. The specific input-output relationship of the power distribution unit 3 can be: one input in the power distribution unit 3 only provides electric energy for one output, multiple inputs in the power distribution unit 3 all provide electric energy for one output, or one input in the power distribution unit 3 provides electric energy for multiple outputs respectively, which will not be repeated here one by one, and all are within the protection scope of this application.

[0108] This embodiment abandons the traditional modular stacking solution, breaks up the modules and recombines them, and no longer uses each module as a black box. Instead, it adopts an integrated design concept, connects multiple DC / DC converters through a rectifier module, reduces the complexity of the system, improves the integration of the charging pile, and reduces the cost, weight and volume of the charging pile. Moreover, the rectifier module has a higher integration, which helps to improve the reliability of the rectifier module. The output end of the rectifier module is mounted with multiple DC / DC converters, so that the output power distribution of the power conversion unit 2 can be more detailed.

[0109] In the above embodiment, the AC power distribution unit 1 includes: a switch unit (including Fig.13 1-2, 1-3 and 1-4).

[0110] The A, B, and C three-phase inputs of the AC power supply, that is, the A, B, and C three-phase AC cables of the AC power supply, are grounded through the lightning arrester 1 - 1 and are connected to the input terminals of the switch units one by one.

[0111] In practical applications, the AC power distribution unit 1 further includes: a lightning arrester 1-1; the A, B, C three-phase input of the AC power supply, that is, the A, B, C three-phase AC cable of the AC power supply, is grounded through the lightning arrester 1-1.

[0112] Specifically, the A-phase AC power Vin_A in the AC power supply electric energy is respectively connected to the A-phase input terminal of the lightning arrester 1-1 and the A-phase input terminal of the switch unit, the B-phase AC power Vin_B in the AC power supply electric energy is respectively connected to the B-phase input terminal of the lightning arrester 1-1 and the B-phase input terminal of the switch unit, and the C-phase AC power Vin_C in the AC power supply electric energy is respectively connected to the C-phase input terminal of the lightning arrester 1-1 and the C-phase input terminal of the switch unit; the grounding terminal of the lightning arrester 1-1 is grounded.

[0113] The output ends of the switch unit are respectively used as the output ends of the AC power distribution unit 1. Specifically, the A-phase output end, the B-phase output end and the C-phase output end of the switch unit are respectively used as the A-phase output end, the B-phase output end and the C-phase output end of the AC power distribution unit 1.

[0114] In practical applications, the switch unit includes: a drive circuit 1-3 and an AC relay group 1-4.

[0115] The input end of the AC relay group 1-4 is connected to the input end of the switch unit. Specifically, the three-phase input end of the AC relay group 1-4 is connected one-to-one with the three-phase AC cable of the AC power supply; the output end of the AC relay group 1-4 is connected to the output end of the switch unit; the AC relay group 1-4 is controlled by the drive circuit.

[0116] The output end of the AC relay group 1-4 serves as the output end of the switch unit; that is, the three-phase output ends of the AC relay group 1-4 serve as the three-phase output ends of the switch unit and are connected one-to-one with the three-phase input ends of the power conversion unit 2; it should be noted that the switch unit outputs three-phase AC power to the power conversion unit 2. The control end of the AC relay group 1-4 is connected to the drive circuit 1-3 so that the AC relay group 1-4 is controlled by the drive circuit 1-3.

[0117] In actual application, the switch unit also includes: a circuit breaker 1-2; the circuit breaker 1-2 is arranged between the input end of the switch unit and the input end of the AC relay group 1-4; that is, the three-phase input ends of the circuit breaker 1-2 are respectively used as the three-phase input ends of the switch unit and are respectively connected one-to-one with the three-phase AC cables of the AC power supply; the three-phase output ends of the circuit breaker 1-2 are respectively connected one-to-one with the three-phase input ends of the AC relay group 1-4.

[0118] The AC relay group 1-4 includes: switch subunits respectively arranged on the cables of each phase in the AC relay group 1-4. Specifically, a switch subunit is arranged on the A-phase cable in the AC relay group 1-4, a switch subunit is arranged on the B-phase cable in the AC relay group 1-4, and a switch subunit is arranged on the C-phase cable in the AC relay group 1-4.

[0119] The switch subunit includes: at least one relay.

[0120] Specifically, the switch subunit may only include: a relay (such as Fig.14 KM1-1, KM1-2 or KM1-3 as shown, such as Fig.14 As shown, the drive circuit 1-3 is connected to the relays KM1-1, KM1-2 and KM1-3 respectively. The relays KM1-1, KM1-2 and KM1-3 are all controlled by the drive circuit 1-3. The drive circuit 1-3 controls the relays KM1-1, KM1-2 and KM1-3 to complete opening and closing.

[0121] Alternatively, the switch subunit may also include a plurality of relays connected in series, such as two relays connected in series (eg Fig.13When the switch subunit includes a plurality of relays connected in series, the relays in the switch subunit back up each other to avoid the switch subunit being unable to close and open reliably after one of the relays fails. Fig.13 As shown, the drive circuit 1-3 is connected to the relays KM1-1, KM1-2 and KM1-3, and is also connected to the relays KM2-1, KM2-2 and KM2-3. The relays KM1-1, KM1-2, KM1-3, KM2-1, KM2-2 and KM2-3 are all controlled by the drive circuit 1-3. The drive circuit 1-3 controls the two relays in each switch subunit to be turned on and off respectively.

[0122] In this embodiment, the AC power distribution unit 1 uses relays for switching, so that the AC power distribution unit 1 occupies a smaller volume, is lighter, and has a more cost-effective. In addition, when the switch subunit includes multiple groups of relays for switching, switching failure caused by relay adhesion can be prevented.

[0123] In practical applications, the rectifier module includes: an EMC circuit 2-1 and an AC / DC converter 2-2 with a PFC function.

[0124] The input end of the EMC circuit 2-1 serves as the AC side of the rectifier module and is connected to the output end of the AC power distribution unit 1. The EMC circuit 2-1 is used to implement EMC filtering to prevent the clutter or noise generated in the rectifier module from being transmitted to the power grid or radiated through space; the output end of the EMC circuit 2-1 is connected to the AC side of the AC / DC converter 2-2; the DC side of the AC / DC converter 2-2 serves as the DC side of the rectifier module; the AC / DC converter 2-2 is used to perform AC / DC conversion and power factor control on the AC power supply energy.

[0125] In practical applications, the rectifier module also includes: a PFC unit; specifically, the PFC unit has multiple forms, and three forms of the PFC unit are described below: the PFC unit is independently set in the front stage of the AC / DC converter; or, the PFC unit is integrated in the AC / DC converter; or, the AC / DC converter is integrated in the PFC unit. The form of the PFC unit is not specifically limited here, and it can be determined according to the actual situation, and all are within the protection scope of this application.

[0126] The PFC unit may be a hardware circuit or a software module; no specific limitation is made here, and it may be determined according to the actual situation, and all are within the protection scope of this application.

[0127] It should be noted that the EMC circuit 2 - 1 has a three-phase input and output, and the AC / DC converter 2 - 2 with PFC function also has a three-phase AC side, so that the charging unit can receive three-phase AC power.

[0128] In practical applications, the charging unit can adopt centralized control or distributed control. The centralized control and distributed control are respectively explained below.

[0129] (1) Fig.15 As shown, when the charging unit adopts centralized control, the charging unit further includes: a centralized control unit 4. The centralized control unit 4 directly controls the AC power distribution unit 1, the power conversion unit 2 and the power distribution unit 3 to perform corresponding actions.

[0130] Specifically, the centralized control unit 4 sends a control signal to the AC distribution unit 1 to control the on and off of the switching device in the AC distribution unit 1, so that the AC distribution unit 1 can be switched on and off, and then whether the power conversion unit 2 is connected to the AC power supply energy; specifically, the centralized control unit 4 sends a control signal to the AC distribution unit 1 drive circuit 1-3, and the drive circuit 1-3 controls the corresponding relay to open or close according to the control signal.

[0131] The centralized control unit 4 sends a PWM signal to the power conversion unit 2 to control the duty cycle of the switching device in the power conversion unit 2, so that the power conversion unit 2 can achieve power conversion. Specifically, the centralized control unit 4 directly controls the duty cycle of the switching device in the AC / DC converter 2-2; and the centralized control unit 4 directly controls the switching frequency and duty cycle of the switching device in each DC / DC converter 2-3.

[0132] The centralized control unit 4 sends a control signal to the power distribution unit 3 to control the on and off of the switch devices in the power distribution unit 3, so that the power distribution unit 3 can realize the distribution of the output power. Specifically, the centralized control unit 4 controls the on and off of the corresponding switches in the power distribution unit 3 according to the actual demand, that is, the power supply demand of the electrical equipment, and then realizes the series and parallel output or independent output of the corresponding DC / DC converter 2-3 to complete the output of different voltages and different powers.

[0133] (2) Fig.16 As shown, when the charging unit adopts distributed control, the charging unit also includes: a distributed control unit; the distributed control unit includes: a system controller 4 and multiple sub-controllers.

[0134] Each sub-controller is respectively connected to the system controller 4 for communication. Specifically, each sub-controller is connected to the system controller 4 for communication via a communication bus 6 .

[0135] It should be noted that each sub-controller can be a relatively simple, low-cost controller to reduce the cost of the charging pile.

[0136] In practical applications, each sub-controller includes: a first sub-controller 5-1, m second sub-controllers 5-2, n*m third sub-controllers 5-3 and a fourth sub-controller 5-4; m is the number of power conversion units 2, and m is a positive integer.

[0137] The first sub-controller 5-1 is used to send a control signal to the AC power distribution unit 1 to switch the AC power distribution unit 1. Specifically, the system controller 4 sends the on / off signal to the first sub-controller 5-1 through the communication bus, and the sub-controller controls the AC relay group 1-4 through the drive circuit 1-3 in the AC power distribution unit 1 to complete the on or off.

[0138] The second sub-controller 5-2 is used to send PWM signals to the corresponding rectifier module so that the rectifier module can achieve power factor control and AC-DC conversion. Specifically, the system controller 4 sends the PWM signal to the second sub-controller 5-2 through the communication bus, and the second sub-controller 5-2 controls the switch tube of the rectifier module in the power conversion unit 2 to generate waves to achieve AC-DC conversion. It should be noted that the second sub-controller 5-2 can be a controller in the rectifier module or a controller independent of the rectifier module; no specific limitation is made here, and it can be determined according to the actual situation, which is within the protection scope of this application.

[0139] The third sub-controller 5-3 is used to send a PWM signal to the corresponding DC / DC converter 2-3 so that the DC / DC converter 2-3 can achieve power conversion. Specifically, the system controller 4 sends the PWM signal to the third sub-controller 5-3 through the communication bus, and the third sub-controller 5-3 controls the switch tube in the DC / DC converter 2-3 to generate a wave to achieve DC / DC conversion.

[0140] The fourth sub-controller 5-4 is used to send a control signal to the power distribution unit 3 so that the power distribution unit 3 can realize the distribution of output power. Specifically, the system controller 4 controls the on and off of the corresponding switches in the power distribution unit 3 according to the actual demand, that is, the power supply demand of the electrical equipment, and then realizes the series and parallel output or independent output of the corresponding DC / DC converter 2-3 to complete the output of different voltages and different powers.

[0141] It should be noted that the distributed control unit and the centralized control unit 4 can also communicate with the host computer through a communication interface, which will not be described one by one here, and are all within the protection scope of this application.

[0142] In this embodiment, the integrated design of each device in the charging unit allows for multiple control modes of the charging unit. The control of the charging unit is mainly completed by a centralized control unit 4 or a system controller 4 in a decentralized control unit; the control process is simple.

[0143] The features recorded in the various embodiments in this specification can be replaced or combined with each other, and the same and similar parts between the various embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0144] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0145] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A charging pile, characterized in that: include: A charging unit and at least one water-cooled radiator are disposed in the box; The charging unit is used to charge the electrical equipment; The charging unit comprises an AC power distribution unit, at least one power conversion unit and a power distribution unit which are electrically connected in sequence; The water-cooled radiator is arranged vertically, and the power conversion unit is arranged on a vertical contact surface outside the water-cooled radiator; The AC power distribution unit and the power distribution unit are respectively arranged at the top and bottom of the box body; or, the AC power distribution unit and the power distribution unit are both arranged at the top or bottom of the box body.

2. The charging pile according to claim 1, characterized in that: The input end of the AC power distribution unit serves as the input end of the charging unit and is used to receive AC power supply energy; The output end of the AC power distribution unit is connected to the AC side of the power conversion unit; Each DC side of the power conversion unit is correspondingly connected to a plurality of input terminals of the power distribution unit; The output end of the power distribution unit serves as the output end of the charging unit.

3. The charging pile according to claim 1, characterized in that: The AC power distribution unit and the power distribution unit are configured in any one of the following ways: The power distribution unit and the AC power distribution unit are respectively arranged at the top and bottom of the power conversion unit; The power distribution unit and the AC power distribution unit are both arranged at the top or bottom of the power conversion unit; Of the power distribution unit and the AC power distribution unit, one is arranged at the top of the box body and located on a side of the power conversion unit that is vertical and away from the water-cooled radiator, and the other is arranged at the bottom of the box body; Of the power distribution unit and the AC power distribution unit, one is arranged at the bottom end of the box body and located on a side of the power conversion unit that is vertical and away from the water-cooled radiator, and the other is arranged at the top end of the box body; The power distribution unit and the AC power distribution unit are respectively disposed at the top and bottom of the box body and are located on a side of the power conversion unit that is vertical and away from the water-cooled radiator.

4. The charging pile according to any one of claims 1 to 3, characterized in that: The water-cooled radiator comprises: a shell and a coolant; The power conversion unit is disposed on a vertical contact surface outside the housing for conducting heat of the power conversion unit; The coolant is arranged inside the shell, and the flowing coolant is used to take away the heat of the shell.

5. The charging pile according to any one of claims 1 to 3, characterized in that: The power conversion unit comprises: a plurality of heating elements; Each of the heating elements of the power conversion unit is respectively arranged on at least one vertical contact surface outside the water-cooling radiator.

6. The charging pile according to claim 5, characterized in that: The water-cooled radiator has a plurality of contact surfaces, a contact surface of the water-cooled radiator on which the heating element is not arranged leans against the back plate of the box body, and at least one other contact surface of the water-cooled radiator is provided with the heating element.

7. The charging pile according to claim 5, characterized in that: The water-cooled radiator is in a plate shape and has two contact surfaces; or, the water-cooled radiator is in a multi-prism structure and has multiple contact surfaces.

8. The charging pile according to claim 5, characterized in that: The water-cooled radiator has a plurality of contact surfaces, all the heating elements in the same power conversion unit are arranged on the same contact surface, and each power conversion unit is arranged on a different contact surface.

9. The charging pile according to any one of claims 1 to 3, characterized in that: The water cooling radiator is placed at the center of the box, or at the center axis position.

10. The charging pile according to any one of claims 1 to 3, characterized in that: The power conversion unit comprises: a rectifier module and n DC / DC converters; n is an integer greater than 1; The AC side of the rectifier module serves as the input end of the power conversion unit; The DC side of the rectifier module is respectively connected to the input ends of the n DC / DC converters; The output ends of the n DC / DC converters are respectively used as the output ends of the power conversion unit.

11. The charging pile according to any one of claims 1 to 3, characterized in that: Also includes: At least one charging gun disposed outside the box; The charging unit charges the electrical device via the charging gun.

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