Charging pile and charging station

Abstract

The utility model provides a charging pile and a charging station, and relates to the technical field of charging control. As the standby auxiliary power supply is arranged between the battery system and the power supply end of the charging and discharging controller, when the power grid side interface of the charging pile is powered off, the standby auxiliary power supply can supply power to the charging and discharging controller after taking power from the battery system, so that the charging and discharging controller can work normally; besides, the second bidirectional charging and discharging module is arranged between the battery system and the direct current side of the first bidirectional charging and discharging module, so that when the power grid side interface of the charging pile is powered off, the second bidirectional charging and discharging module can be matched with the charging and discharging controller to carry out insulation detection, pre-charging and other operations before charging and discharging; therefore, the first bidirectional charging and discharging module can perform charging and discharging between the power grid side interface and the automobile side interface of the charging pile, and even if the charging pile can work normally, off-grid charging and discharging can be realized.

Description

Technical Field

[0001] The present application relates to the field of charging control technology, and in particular to a charging pile and a charging station. Background Art

[0002] With the development of vehicle-grid interaction technology, V2G (Vehicle to Grid) charging piles are gradually being used in the market.

[0003] However, current V2G charging piles generally only support grid-connected charging and discharging, but not off-grid charging and discharging; that is, the V2G charging pile can work when it is normally connected to the grid, but cannot work normally when the grid is out of power; so when the grid is out of power, the V2G charging pile cannot use the vehicle battery as an emergency power source to power other power loads, resulting in idleness and waste of backup power supply.

[0004] Therefore, how to enable V2G charging piles to achieve off-grid charging and discharging is a technical problem that needs to be solved urgently. Utility Model Content

[0005] In view of this, the present application provides a charging pile and a charging station so that the V2G charging pile can realize off-grid charging and discharging.

[0006] To achieve the above objectives, the present application provides the following technical solutions:

[0007] On one hand, the present application provides a charging pile, comprising: a charging and discharging controller, a first bidirectional charging and discharging module, a battery system, a second bidirectional charging and discharging module and a backup auxiliary power supply; wherein,

[0008] The first bidirectional charging and discharging module is arranged between the grid side interface and the vehicle side interface of the charging pile;

[0009] The input end of the backup auxiliary power supply is connected to the battery system; the output end of the backup auxiliary power supply is connected to the power supply end of the charge and discharge controller;

[0010] The second bidirectional charge and discharge module is arranged between the battery system and the DC side of the first bidirectional charge and discharge module;

[0011] The charge and discharge controller is communicatively connected with the battery system, the first bidirectional charge and discharge module and the second bidirectional charge and discharge module respectively.

[0012] Optionally, the charging pile further includes: a main auxiliary power supply;

[0013] The input end of the main auxiliary power supply is connected to the grid-side interface of the charging pile; the output end of the main auxiliary power supply is connected to the power supply end of the charge and discharge controller.

[0014] Optionally, the charging pile further includes: an automatic power conversion switch;

[0015] The first input terminal of the automatic power conversion switch is connected to the output terminal of the main auxiliary power supply;

[0016] The second input terminal of the automatic power conversion switch is connected to the output terminal of the standby auxiliary power supply;

[0017] The output terminal of the automatic power conversion switch is connected to the power supply terminal of the charge and discharge controller.

[0018] Optionally, in the automatic power conversion switch, the priority of the first input terminal connecting to the output terminal is higher than that of the second input terminal connecting to the output terminal.

[0019] Optionally, the standby auxiliary power supply is a DC / DC converter;

[0020] The second bidirectional charge and discharge module is a bidirectional DC / DC converter;

[0021] The first bidirectional charge and discharge module is a bidirectional AC / DC converter.

[0022] Optionally, the main auxiliary power supply is an AC / DC converter.

[0023] Optionally, the battery system includes: a battery management system and a battery branch;

[0024] The battery branch includes: one battery, or at least two batteries connected in series and parallel;

[0025] The battery branch is respectively connected to the standby auxiliary power supply and the second bidirectional charge and discharge module;

[0026] The battery management system monitors and manages the battery;

[0027] The battery management system is communicatively connected to the charge and discharge controller.

[0028] Optionally, the capacity of the battery system is greater than a preset capacity, and the rated power of the second bidirectional charge and discharge module is greater than a preset power.

[0029] On the other hand, this application provides a charging station, including: a grid connection cabinet, a power distribution cabinet, a microgrid controller, and at least one charging pile; wherein,

[0030] One side of the grid connection cabinet is connected to the grid connection point and the sampling terminal of the microgrid controller;

[0031] The other side of the grid connection cabinet is connected to one side of the power distribution cabinet;

[0032] The other side of the power distribution cabinet is connected to the grid-side interface of the charging pile;

[0033] The charging pile is the charging pile described in any one of the above first aspects;

[0034] The power supply end of the microgrid controller is connected in parallel with the power supply end of the charge and discharge controller in any one of the charging piles;

[0035] The grid connection cabinet is controlled by the microgrid controller, and the microgrid controller is communicatively connected to the charge and discharge controller.

[0036] Optionally, when the number of the charging piles is greater than 1, each of the charging piles shares the same battery system, and the battery system is independently arranged outside each of the charging piles.

[0037] Optionally, each of the charging piles shares the same second bidirectional charge and discharge module, and the second bidirectional charge and discharge module is independently arranged outside each of the charging piles.

[0038] Optionally, in each of the charging piles, the DC side of the first bidirectional charge and discharge module is connected to the second bidirectional charge and discharge module through a corresponding switch.

[0039] Optionally, each of the charging piles shares the same standby auxiliary power supply, the standby auxiliary power supply is independently arranged outside each of the charging piles, and the power supply end of the microgrid controller is connected in parallel with the power supply end of each of the charge and discharge controllers.

[0040] As can be seen from the above technical solutions, the present application provides a charging pile. Since the standby auxiliary power supply is arranged between the battery system and the power supply end of the charge and discharge controller, when the grid-side interface of the charging pile is powered off, the standby auxiliary power supply can draw power from the battery system and supply power to the charge and discharge controller, so that the charge and discharge controller can work normally; in addition, since the second bidirectional charge and discharge module is arranged between the battery system and the DC side of the first bidirectional charge and discharge module, when the grid-side interface of the charging pile is powered off, the second bidirectional charge and discharge module can cooperate with the charge and discharge controller to perform operations before charge and discharge such as insulation detection and pre-charging, so that the first bidirectional charge and discharge module can perform charge and discharge between the grid-side interface and the vehicle-side interface of the charging pile, that is, the charging pile can work normally, and thus off-grid charge and discharge can be realized. Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0042] Figure 1 Schematic diagram of a structure of a charging pile provided by an embodiment of the present application;

[0043] Figure 2 Schematic diagram of a structure of another embodiment of a charging pile provided by an embodiment of the present application;

[0044] Figure 3 Schematic diagram of a structure of another embodiment of a charging pile provided by an embodiment of the present application;

[0045] Figure 4 Schematic diagram of a structure of an embodiment of ATS 70 provided by an embodiment of the present application;

[0046] Figure 5 Schematic diagram of a structure of another embodiment of a charging pile provided by an embodiment of the present application;

[0047] Figure 6 Schematic diagram of a structure of another embodiment of a charging pile provided by an embodiment of the present application;

[0048] Figure 7 Schematic diagram of a structure of another embodiment of a charging pile provided by an embodiment of the present application;

[0049] Figure 8 Schematic diagram of a structure of another embodiment of a charging pile provided by an embodiment of the present application. Detailed implementation manners

[0050] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0051] In the present application, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, elements defined by the statement "including an..." do not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0052] When the power grid connected to the charging pile is powered off, the auxiliary power supply in the charging pile is powered off, which causes the charge-discharge controller in the charging pile to be powered off. As a result, the charge-discharge controller cannot work properly, and further, the charge-discharge controller cannot communicate with the vehicle, that is, the charging pile cannot communicate with the vehicle, so the state of the vehicle battery cannot be obtained. In addition, when the power grid connected to the charging pile is powered off, one end of the bi-directional charge-discharge module in the charging pile connected to the power grid is powered off, resulting in the bi-directional charge-discharge module being unable to perform operations before charge and discharge such as insulation detection and pre-charging, and further causing the bi-directional charge-discharge module to be unable to perform charge and discharge.

[0053] Based on the above two points, when the power grid connected to the charging pile is powered off, the charging pile cannot operate normally, that is, the existing charging piles do not support off-grid charge and discharge.

[0054] In order to enable the charging pile to achieve off-grid charge and discharge, an embodiment of the present application provides a charging pile, and its specific structure is as Figure 1 shown, specifically including: a charge-discharge controller 10, a first bi-directional charge-discharge module 20, a second bi-directional charge-discharge module 40, a standby auxiliary power supply 50, and a battery system 60; the connection relationships between the components are specifically described as follows:

[0055] The first bi-directional charge-discharge module 20 is arranged between the power grid side interface and the vehicle side interface of the charging pile.

[0056] The power grid side interface of the charging pile is used to be directly or indirectly connected to the power grid, and the vehicle side interface of the charging pile is used to be connected to the charging interface of the vehicle 01. It should be noted that in actual applications, the connection between the vehicle side interface of the charging pile and the charging interface of the vehicle 01 can be specifically realized by the plugging of the charging plug 02 and the charging socket 03 shown in the figure.

[0057] It should be noted that the DC side of the first bi-directional charge-discharge module 20 can be sequentially connected to the vehicle side interface of the charging pile through a fuse 04 and a switch K1. In actual applications, other situations are not excluded, and no specific limitation is made here. It can be determined according to specific situations, and all are within the protection scope of the present application. In addition, the AC side of the first bi-directional charge-discharge module 20 can be connected to the power grid side interface of the charging pile through a switch K2. In actual applications, other situations are not excluded, and no specific limitation is made here. It can be determined according to specific situations, and all are within the protection scope of the present application.

[0058] The first bidirectional charge and discharge module 20 can be a bidirectional AC / DC converter. In practical applications, other structures are not excluded. For example, the first bidirectional charge and discharge module 20 can also include a bidirectional AC / DC converter and a bidirectional DC / DC converter connected in sequence. Specific limitations are not made here and can be determined according to specific circumstances. As long as it can convert alternating current into direct current, it is within the protection scope of this application.

[0059] The input end of the standby auxiliary power supply 50 is connected to the battery system 60, and the output end of the standby auxiliary power supply 50 is connected to the power supply end of the charge and discharge controller 10; the standby auxiliary power supply 50 is used to draw power from the battery system 60, convert it into the voltage required by the charge and discharge controller 10, and then output it to the charge and discharge controller 10 to provide electrical energy to the charge and discharge controller 10.

[0060] It should be noted that the input end of the standby auxiliary power supply 50 can be connected to the battery system 60 through a switch K4. In practical applications, other situations are not excluded. Specific limitations are not made here and can be determined according to specific circumstances, and they are all within the protection scope of this application.

[0061] The output of the battery system 60 is direct current, so the standby auxiliary power supply 50 can be a DC / DC converter. In practical applications, other structures are not excluded. For example, the standby auxiliary power supply 50 can also include a DC / AC converter and an AC / DC converter connected in sequence. Specific limitations are not made here and can be determined according to specific circumstances. As long as it can achieve voltage conversion for direct current, it is within the protection scope of this application.

[0062] The second bidirectional charge and discharge module 40 is arranged between the battery system 60 and the DC side of the first bidirectional charge and discharge module 20. The DC side of the first bidirectional charge and discharge module 20 is also the side of the first bidirectional charge and discharge module 20 used to connect to the vehicle side interface.

[0063] The output of the battery system 60 is direct current. The second bidirectional charge and discharge module 40 can be a bidirectional DC / DC converter. Of course, a structure in which a DC / AC converter and an AC / DC converter are connected in sequence is not excluded, and they are all within the protection scope of this application.

[0064] The charge and discharge controller 10 is communicatively connected to the battery system 60, the first bidirectional charge and discharge module 20, and the second bidirectional charge and discharge module 40 respectively.

[0065] In addition, the charge and discharge controller 10 is also communicatively connected to the vehicle 01. In practical applications, the communication connection between the charge and discharge controller 10 and the vehicle 01 can be specifically realized through the plugging of the charging plug 02 and the charging socket 03.

[0066] When the grid-side interface of the charging pile is powered off, the charge-discharge controller 10 can obtain power supply through the backup auxiliary power supply 50 and enter normal operation, and then can control the second bidirectional charge-discharge module 40 to perform operations before charge and discharge such as insulation detection and pre-charging. As for how the charge-discharge controller 10 controls the second bidirectional charge-discharge module 40 to perform operations before charge and discharge such as insulation detection and pre-charging, reference can be made to the corresponding control of the original bidirectional charge-discharge module in the prior art, which will not be elaborated here.

[0067] In addition, for the control process of the charge-discharge controller 10 on the first bidirectional charge-discharge module 20, reference can also be made to the corresponding control of the original bidirectional charge-discharge module in the prior art, which will not be elaborated here.

[0068] Since the backup auxiliary power supply 50 is arranged between the battery system 60 and the power supply end of the charge-discharge controller 10, when the grid-side interface of the charging pile is powered off, the backup auxiliary power supply 50 can draw power from the battery system 60 and supply power to the charge-discharge controller 10, so that the charge-discharge controller 10 can operate normally. In addition, since the second bidirectional charge-discharge module 40 is arranged between the battery system 60 and the DC side of the first bidirectional charge-discharge module 20, when the grid-side interface of the charging pile is powered off, the second bidirectional charge-discharge module 40 can cooperate with the charge-discharge controller 10 to perform operations before charge and discharge such as insulation detection and pre-charging, so that the first bidirectional charge-discharge module 20 can perform charge and discharge between the grid-side interface and the vehicle-side interface of the charging pile, that is, the charging pile can operate normally, and then off-grid charge and discharge can be realized. For example, off-grid discharge of the vehicle battery can be realized, or V2G off-grid discharge can be realized. At this time, the vehicle battery can be used as a backup power supply. Furthermore, the charging pile has a black start function.

[0069] It should be noted that there is also a solution in the prior art, which is to add an energy storage battery unit in the charging pile. When the power grid is powered off, the energy storage battery unit of this solution can supply power to the intermediate DC bus unit of the bidirectional charge-discharge module through two levels of single-way DC / DC modules in sequence, so that the intermediate DC bus unit can obtain power supply and then the insulation detection during the charge and discharge process can be realized. Moreover, it can also supply power to the charge-discharge controller through the first-level single-way DC / DC module, so that the charging pile can realize off-grid charge and discharge. However, through the power conversion of the two-level DC / DC module, the working efficiency will be reduced. And both of these two-level DC / DC modules are single-way conversion devices, and the above solution cannot be guaranteed to be realized after the power of the energy storage battery unit is exhausted. Furthermore, the intermediate DC bus unit mentioned above is generally not led out in the current market V2G charging piles, so this solution is not applicable to the mainstream V2G charging piles in the market.

[0070] In this embodiment, the second bidirectional charge and discharge module 40 and the standby auxiliary power supply 50 are power conversion devices of the same level. The second bidirectional charge and discharge module 40 is directly connected to the battery system 60 without passing through the standby auxiliary power supply 50. When the second bidirectional charge and discharge module 40 adopts a single-stage power converter, compared with the two-stage power conversion in the above-mentioned prior art, the efficiency can be improved. Moreover, in this embodiment, the second bidirectional charge and discharge module 40 is arranged between the battery system 60 and the DC side of the first bidirectional charge and discharge module 20. The second bidirectional charge and discharge module 40 can realize bidirectional power conversion, so it can charge the battery system 60, thus solving the irreversible problem of the battery system and ensuring the sustainable and stable operation of the charging pile. In addition, in this embodiment, the second bidirectional charge and discharge module 40 is directly connected to the DC side of the first bidirectional charge and discharge module 20, and operations before charge and discharge such as insulation detection and pre-charging can be carried out in cooperation with the charge and discharge controller 10, without leading out an intermediate DC bus unit to realize operations before charge and discharge such as insulation detection and pre-charging. Therefore, it can be applied to the mainstream V2G charging piles in the market and is easy to implement. Furthermore, this embodiment only requires the second bidirectional charge and discharge module 40, the standby auxiliary power supply 50 and the battery system 60, with fewer components and a simple solution, which is beneficial to product application.

[0071] Another embodiment of the present application provides another implementation manner of the charging pile, and its specific structure is as Figure 2 shown. On the basis of the above implementation manner, this implementation manner further includes: a main auxiliary power supply 30.

[0072] The input end of the main auxiliary power supply 30 is connected to the grid side interface of the charging pile; the output end of the main auxiliary power supply 30 is connected to the power supply end of the charge and discharge controller 10; the main auxiliary power supply 30 is used to draw power from the grid, convert the received alternating current into direct current required by the charge and discharge controller 10 and then output it to the charge and discharge controller 10 to provide electrical energy for the charge and discharge controller 10.

[0073] It should be noted that the input end of the main auxiliary power supply 30 can be connected to the grid side interface of the charging pile through a switch K3. In actual applications, other situations are not excluded either, and no specific limitation is made here. It can be determined according to specific situations, and all are within the protection scope of the present application.

[0074] The main auxiliary power supply 30 can be an AC / DC converter. In actual applications, other structures are not excluded either. For example, the main auxiliary power supply 30 can also include an AC / DC converter and a DC / DC converter connected in sequence. No specific limitation is made here. It can be determined according to specific situations, as long as it can convert alternating current into direct current, and all are within the protection scope of the present application.

[0075] Furthermore, as Figure 3As shown in the figure, the charging pile may further include: an ATS (Automatic Transfer Switch) 70.

[0076] The first input terminal of the ATS 70 is connected to the output terminal of the main auxiliary power supply 30; the second input terminal of the ATS 70 is connected to the output terminal of the standby auxiliary power supply 50; the output terminal of the ATS 70 is connected to the power supply terminal of the charge and discharge controller 10.

[0077] The ATS 70 is used to automatically use the input of one of its input terminals as the output of its output terminal when there is no input at one of its input terminals, that is, when one auxiliary power supply has no output, it automatically uses the output of the other auxiliary power supply as the output of its output terminal.

[0078] In this embodiment, by adding the ATS 70, the two auxiliary power supplies are not directly connected, which can avoid forming a circulating current between the two auxiliary power supplies, thereby avoiding damage to the two auxiliary power supplies, and avoiding affecting the life or working efficiency of the two auxiliary power supplies.

[0079] The above is only one implementation manner of the charging pile. In practical applications, it includes but is not limited to this. No specific limitation is made here, and it can be determined according to specific situations, and all are within the protection scope of this application.

[0080] Another embodiment of this application also provides another implementation manner of the charging pile. The structure of this implementation manner is the same as that of the previous implementation manner, so it will not be repeated here; the difference between the two is that: in this implementation manner, the priority of the first input terminal of the ATS 70 connecting to the output terminal of the ATS 70 is higher than the priority of the second input terminal of the ATS 70 connecting to the output terminal of the ATS 70; in other words, when there is an input at the first input terminal of the ATS 70, the ATS 70 will use the input of its first input terminal as the output of its output terminal, and when there is no input at the first input terminal of the ATS 70, the ATS 70 will use the input of its second input terminal as the output of its output terminal.

[0081] In this embodiment, by setting the priorities of the two input terminals of the ATS 70, the power supply of the charge and discharge controller 10 only comes from the standby auxiliary power supply 50 when the main auxiliary power supply 30 is powered off, thereby reducing unnecessary consumption of the battery system 60, and further increasing the possibility that the charge and discharge controller 10 can work normally when the grid-side interface of the charging pile is powered off.

[0082] In practical applications, the ATS 70 may specifically be a relay, and its specific structure is as Figure 4 shown in the figure, and specifically includes: a coil 71, a first conversion contact 72, and a second conversion contact 73.

[0083] Both ends of the coil 71 are respectively connected to the positive electrode AU1+ of the first input end of the ATS 70 and the negative electrode AU1- of the first input end of the ATS 70, and then are respectively connected to the positive and negative electrodes of the output end of the main auxiliary power supply 30 correspondingly.

[0084] The first conversion contact 72 includes a first moving contact 721, a first normally open static contact 722 and a first normally closed static contact 723; the first normally open static contact 722 is connected to the positive electrode AU1+ of the first input end of the ATS 70, the first normally closed static contact 723 is connected to the positive electrode AU2+ of the second input end of the ATS 70, and the first moving contact 721 is connected to the positive electrode OUT+ of the output end of the ATS 70.

[0085] In the first conversion contact 72, the first normally open static contact 722 is a static contact that is in an open state when the coil 71 loses power, that is, the first normally open static contact 722 is a static contact that disconnects from the first moving contact 721 when the coil 71 loses power; the first normally closed static contact 723 is a static contact that is in a closed state when the coil 71 loses power, that is, the first normally closed static contact 723 is a static contact that closes with the first moving contact 721 when the coil 71 loses power.

[0086] The second conversion contact 73 includes a second moving contact 731, a second normally open static contact 732 and a second normally closed static contact 733. The second normally open static contact 732 is connected to the negative electrode AU1- of the first input end of the ATS 70, the second normally closed static contact 733 is connected to the negative electrode AU2- of the second input end of the ATS 70, and the second moving contact 731 is connected to the negative electrode OUT- of the output end of the ATS 70.

[0087] In the second conversion contact 73, the second normally open static contact 732 is a static contact that is in an open state when the coil 71 loses power, that is, the second normally open static contact 732 is a static contact that disconnects from the second moving contact 731 when the coil 71 loses power; the second normally closed static contact 733 is a static contact that is in a closed state when the coil 71 loses power, that is, the second normally closed static contact 733 is a static contact that closes with the second moving contact 731 when the coil 71 loses power.

[0088] When the main auxiliary power supply 30 has an output, the coil 71 is energized, the first normally open static contact 722 and the second normally open static contact 732 are both in a closed state, and the first normally closed static contact 723 and the second normally closed static contact 733 are both in an open state, so that electric energy is output from the main auxiliary power supply 30 to the output end of the ATS 70; when the main auxiliary power supply 30 has no output, the coil 71 is de-energized, the first normally open static contact 722 and the second normally open static contact 732 are both in an open state, and the first normally closed static contact 723 and the second normally closed static contact 733 are both in a closed state, so that electric energy is output from the standby auxiliary power supply 50 to the output end of the ATS 70.

[0089] In this embodiment, through the coil 71, the first conversion contact 72, and the second conversion contact 73, the priority of connecting the first input end of the ATS 70 to the output end of the ATS 70 is higher than that of connecting the second input end of the ATS 70 to the output end of the ATS 70. Therefore, the structure of the ATS 70 is simplified, thereby improving the reliability of the ATS 70 and reducing the overall cost of the ATS 70.

[0090] The above is only one implementation manner of the charging pile. In actual applications, it includes but is not limited to this. No specific limitation is made here, and it can be determined according to specific situations, all within the protection scope of this application.

[0091] Another embodiment of this application also provides another implementation manner of the charging pile. The structure of this implementation manner is the same as that of the above implementation manner, and will not be elaborated here; the difference between the two is that:

[0092] In this implementation manner, when the charge-discharge controller 10 detects through communication with the battery system 60 that the power of the battery system 60 is lower than a certain threshold, it controls the second bi-directional charge-discharge module 40 to draw power from the DC side of the first bi-directional charge-discharge module 20 and then charge the battery system 60.

[0093] If the grid-side interface of the charging pile is not powered off, that is, the grid is normally powered, then at this time, the electric energy of the second bi-directional charge-discharge module 40 can come from the grid-side interface of the charging pile or the vehicle-side interface of the charging pile; in other words, when the grid is normally powered, the first bi-directional charge-discharge module 20 normally charges and discharges the vehicle, and at the same time, the charge-discharge controller 10 controls the second bi-directional charge-discharge module 40 to charge the battery system 60 as needed according to the power of the battery system 60; if the electric energy of the second bi-directional charge-discharge module 40 comes from the grid-side interface of the charging pile, then the energy flow path at this time is as shown by the dotted line with arrows in Figure 5 (taking the structure shown in Figure 2 as an example for display). If the electric energy of the second bi-directional charge-discharge module 40 comes from the vehicle-side interface of the charging pile, then the energy flow path at this time is as shown by the dotted line with arrows in Figure 5 .

[0094] If the grid-side interface of the charging pile is powered off, that is, the grid is powered off, then the electric energy of the second bi-directional charge-discharge module 40 can come from the vehicle-side interface of the charging pile, and the energy flow path at this time is as shown by the dotted line with arrows in Figure 5 .

[0095] In this embodiment, by using the communication between the charge and discharge controller 10 and the battery system 60, when the power of the battery system 60 is lower than a certain threshold, the battery system 60 is charged through the second bidirectional charge and discharge module 40, so as to ensure that the battery system 60 has sufficient power, and thus to a certain extent ensure the reliability of the off-grid charge and discharge of the charging pile, and further ensure the normal operation of the black start function of the charging pile.

[0096] The above is only one implementation manner of the charging pile. In actual applications, it includes but is not limited to this. No specific limitation is made here and it can be determined according to specific situations, all within the protection scope of this application.

[0097] Another embodiment of this application also provides another implementation manner of the charging pile. The structure of this implementation manner is the same as that of the above implementation manner and will not be elaborated here; the difference between the two is:

[0098] In this implementation manner, the capacity of the battery system 60 is greater than the preset capacity, and the rated power of the second bidirectional charge and discharge module 40 is greater than the preset power.

[0099] The capacity of the battery system 60 being greater than the preset capacity enables the capacity of the battery system 60 to meet the demand for supplying power to the vehicle battery by itself; in actual applications, the preset capacity can be set according to the actual situation of the vehicle battery, and no specific limitation is made here.

[0100] The rated power of the second bidirectional charge and discharge module 40 being greater than the preset power enables the second bidirectional charge and discharge module 40 to meet the power demand for charging the vehicle battery; in actual applications, the preset power can be set according to the actual situation of the vehicle battery, and no specific limitation is made here.

[0101] In this embodiment, by reasonably setting the capacity of the battery system 60 and the power of the second bidirectional charge and discharge module 40, the battery system 60 can supply power to the vehicle battery when the grid-side interface of the charging pile is powered off, that is, the charging pile draws power from the battery system 60 and charges the vehicle battery.

[0102] The above is only one implementation manner of the charging pile. In actual applications, it includes but is not limited to this. No specific limitation is made here and it can be determined according to specific situations, all within the protection scope of this application.

[0103] Another embodiment of this application provides an implementation manner of the battery system 60, and its specific structure is as Figure 6 (taking the structure shown in Figure 2 as an example for display) shown, and specifically includes: a battery branch 61 and a BMS (Battery Management System) 62.

[0104] The battery branch 61 includes: one battery, or at least two batteries connected in series and parallel.

[0105] The battery branch 61 is respectively connected to the standby auxiliary power supply 50 and the second bidirectional charge and discharge module 40; specifically, the positive pole of the battery branch 61 is respectively connected to the positive pole of the input end of the standby auxiliary power supply 50 and the positive pole of the side of the second bidirectional charge and discharge module 40 close to the battery branch 61, and the negative pole of the battery branch 61 is respectively connected to the negative pole of the input end of the standby auxiliary power supply 50 and the negative pole of the side of the second bidirectional charge and discharge module 40 close to the battery branch 61.

[0106] The BMS 62 monitors and manages each battery, for example, it can collect information such as the voltage and temperature of each battery, etc.; the BMS 62 is communicatively connected to the charge and discharge controller 10, and the charge and discharge controller 10 replenishes power for the battery branch 61 in a timely manner according to the requirements of the BMS 62 to ensure the continuous operation of the charging pile.

[0107] The above is only a specific implementation manner of the battery system 60. In actual applications, it includes but is not limited to this. No specific limitation is made here, and it can be determined according to specific situations, and all are within the protection scope of this application.

[0108] Another embodiment of this application provides a charging station, and its structure is as Figure 7 (taking the structure shown in Figure 2 as an example for display), and specifically includes: a grid connection cabinet 100, a power distribution cabinet 200, a microgrid controller 300, and at least one charging pile 400; the connection relationships between the devices are specifically as described below:

[0109] One side of the grid connection cabinet 100 is respectively connected to the grid connection point and the sampling end of the microgrid controller 300; among them, being connected to the grid connection point can connect the charging station to the power grid.

[0110] The other side of the grid connection cabinet 100 is connected to one side of the power distribution cabinet 200; the other side of the power distribution cabinet 200 is connected to the grid side interface of the charging pile 400; the charging pile 400 is the charging pile provided in any of the above embodiments, and is not limited to Figure 2 as shown. Its structure and working principle can be referred to the above embodiments, and will not be elaborated here one by one.

[0111] The power supply end of the microgrid controller 300 is connected in parallel with the power supply end of the charge and discharge controller 10 in any one of the charging piles 400 to receive the power supply from any one of the auxiliary power supplies in the corresponding charging pile 400.

[0112] The grid connection cabinet 100 is controlled by the microgrid controller 300, and the microgrid controller 300 is communicatively connected to the charge and discharge controller 10 in each charging pile 400.

[0113] The microgrid controller 300 determines whether the power grid is powered off by performing AC sampling on the grid connection point. When it detects that the power grid is powered off, the microgrid controller 300 notifies the charge and discharge controller 10 through communication with the charge and discharge controller 10, and causes the corresponding charge and discharge controller 10 to switch to the off-grid mode. Additionally, the microgrid controller 300 also controls the grid connection cabinet 100 to disconnect the connection with the power grid.

[0114] When it detects that the power grid is normally powered, the microgrid controller 300 notifies the charge and discharge controller 10 through communication with the charge and discharge controller 10, and causes the corresponding charge and discharge controller 10 to switch to the grid-connected mode. Additionally, the microgrid controller 300 also controls the grid connection cabinet 100 to re-establish the connection with the power grid.

[0115] It should be noted that the off-grid mode and grid-connected mode of the charge and discharge controller 10 can refer to the prior art and will not be elaborated here.

[0116] In this embodiment, the microgrid controller 300 realizes grid connection detection and off-grid detection, and notifies the charge and discharge controller 10, enabling the corresponding charging pile 400 to perform corresponding operations. Additionally, the microgrid controller 300 also synchronously controls the grid connection cabinet 100 to perform grid connection and off-grid switching, thereby to a certain extent preventing the charging pile 400 from feeding power to the power grid when the power grid is powered off. Moreover, in this embodiment, by setting a battery system 60, a standby auxiliary power supply 50, and a second bidirectional charge and discharge module 40 in the charging pile, the charging pile has a black start function. Thus, when the power grid is powered off, the battery system 60 in the charging pile can be used to supply power to the charge and discharge controller 10 in the charging pile. At the same time, the second bidirectional charge and discharge module 40 can be used to perform operations before charge and discharge such as insulation detection and pre-charging, enabling the charging pile to perform off-grid charge and discharge, and further enabling off-grid power supply to other electrical equipment, making the vehicle a reliable backup power source. And through the second bidirectional charge and discharge module 40, the battery system 60 can be replenished with power as needed according to the power of the battery system 60, ensuring the continuous operation of the charging pile.

[0117] Another embodiment of the present application provides another implementation manner of the charging station. The structure of this implementation manner is substantially the same as that of the above implementation manner, and the difference between the two is as follows:

[0118] In this implementation manner, the number of charging piles 400 is greater than 1, and each charging pile 400 shares the same battery system 60, and the battery system 60 is independently arranged outside each charging pile 400.

[0119] The battery system 60 has a separate communication network, such as a CAN network. Taking the battery system 60 as an example, to avoid conflicts caused by the battery system 60 being simultaneously controlled by multiple charging piles 400, the charging piles 400 on the network can be addressed. The charging pile 400 with the smallest address serves as the host, and the requirements of all other charging piles 400 are sent to the battery system 60 through this host. When the charging pile 400 with the smallest address has a communication anomaly, the charging pile 400 with the second smallest address automatically serves as the new host and communicates with the battery system 60.

[0120] In this embodiment, by sharing the battery system 60, the battery system 60 can be arranged outside the charging pile 400, so that the battery system 60 becomes a shared backup power source for the entire charging station instead of a backup power source for a single charging pile 400, thereby reducing the overall cost of the charging station.

[0121] In addition, on this basis, each charging pile 400 can further share the same second bidirectional charge and discharge module 40 and / or share the same backup auxiliary power source 50. When sharing the same second bidirectional charge and discharge module 40, the second bidirectional charge and discharge module 40 is independently arranged outside each charging pile 400. When sharing the same backup auxiliary power source 50, the backup auxiliary power source 50 is independently arranged outside each charging pile 400; and at this time, the power supply ends of the microgrid controller 300 and the charge and discharge controllers 10 are connected in parallel.

[0122] Figure 8 Taking the example of each charging pile 400 sharing the same battery system 60, the same second bidirectional charge and discharge module 40, and the same backup auxiliary power source 50 for display. In practical applications, the DC sides of the first bidirectional charge and discharge modules 20 can be respectively connected to the second bidirectional charge and discharge module 40 through corresponding switches K5, so that the second bidirectional charge and discharge module 40 can selectively connect to the DC side of any first bidirectional charge and discharge module 20. In addition, if in the above embodiment, the input ends of the backup auxiliary power sources 50 in each charging pile 400 are connected to the battery system 60 through switches K4, then in this embodiment, the switches K4 are integrated into a switch K6, and K6 is arranged between the backup auxiliary power source 50 and the battery system 60. It should be noted that the AC side of the second bidirectional charge and discharge module 40 can be connected to the battery system 60 through a switch K7. In practical applications, other situations are not excluded either. Here, no specific limitations are made and it can be determined according to specific situations, all within the protection scope of this application. It should also be noted that the battery system 60, the second bidirectional charge and discharge module 40, and the backup auxiliary power source 50 can be respectively connected to the corresponding devices inside the charging pile 400 through corresponding terminal transfers. As for the corresponding devices to which the three are respectively connected, they have been elaborated in detail in the above embodiments and will not be repeated here.

[0123] The second bi-directional charge and discharge module 40 has a separate communication network, such as a CAN network. For the communication between it and each charging pile, the communication principle between the battery system 60 and each charging pile as described above can be referred to, and will not be elaborated here.

[0124] When sharing any device, there is no need to separately equip each charging pile with the corresponding device, thus saving the corresponding cost. As Figure 8 shown, when sharing the battery system 60, the second bi-directional charge and discharge module 40 and the standby auxiliary power supply 50, the overall cost of the charging station can be greatly saved. However, in practical applications, it is not limited to Figure 8 the form shown. Each charging pile can only share the battery system 60; or, each charging pile 400 can also only share the battery system 60 and the second bi-directional charge and discharge module 40, and are respectively equipped with their own standby auxiliary power supplies 50; or, each charging pile 400 can also only share the battery system 60 and the standby auxiliary power supply 50, and are respectively equipped with their own second bi-directional charge and discharge modules 40. It can be determined according to its specific application environment, and all are within the protection scope of this application.

[0125] Regarding the above description of the disclosed embodiments, the features described in each embodiment in this specification can be mutually replaced or combined, enabling those skilled in the art to implement or use this application. The above are only the preferred embodiments of this application, and do not impose any formal restrictions on this application. Although this application has been disclosed above with preferred embodiments, it is not intended to limit this application. Any person skilled in the art can make many possible changes and modifications to the technical solution of this application, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of this application. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application still fall within the scope of the protection of the technical solution of this application.

Claims

1. A charging pile, characterized in that: include: A charge and discharge controller, a first bidirectional charge and discharge module, a battery system, a second bidirectional charge and discharge module and a backup auxiliary power supply; wherein, The first bidirectional charging and discharging module is arranged between the grid side interface and the vehicle side interface of the charging pile; The input end of the backup auxiliary power supply is connected to the battery system; the output end of the backup auxiliary power supply is connected to the power supply end of the charge and discharge controller; The second bidirectional charge and discharge module is arranged between the battery system and the DC side of the first bidirectional charge and discharge module; The charge and discharge controller is communicatively connected with the battery system, the first bidirectional charge and discharge module and the second bidirectional charge and discharge module respectively.

2. The charging pile according to claim 1, characterized in that: Also includes: Main auxiliary power supply; The input end of the main auxiliary power supply is connected to the grid side interface of the charging pile; The output end of the main auxiliary power supply is connected to the power supply end of the charge and discharge controller.

3. The charging pile according to claim 2, characterized in that: Also includes: Automatic power transfer switch; The first input terminal of the automatic power supply transfer switch is connected to the output terminal of the main auxiliary power supply; The second input end of the automatic power supply transfer switch is connected to the output end of the backup auxiliary power supply; The output end of the automatic power supply transfer switch is connected to the power supply end of the charge and discharge controller.

4. The charging pile according to claim 3, characterized in that: In the automatic power transfer switch, the priority of the first input terminal connecting to the output terminal is higher than the priority of the second input terminal connecting to the output terminal.

5. The charging pile according to claim 1, characterized in that: The backup auxiliary power supply is a DC / DC converter; The second bidirectional charging and discharging module is a bidirectional DC / DC converter; The first bidirectional charging and discharging module is a bidirectional AC / DC converter.

6. The charging pile according to claim 2, characterized in that: The main auxiliary power supply is an AC / DC converter.

7. The charging pile according to any one of claims 1 to 6, characterized in that: The battery system comprises: a battery management system and a battery branch circuit; The battery branch includes: one battery, or at least two batteries connected in at least one of series connection and parallel connection; The battery branch is respectively connected to the backup auxiliary power supply and the second bidirectional charge and discharge module; The battery management system monitors and manages the battery; The battery management system is communicatively connected with the charge and discharge controller.

8. The charging pile according to any one of claims 1 to 6, characterized in that: The capacity of the battery system is greater than a preset capacity, and the rated power of the second bidirectional charge and discharge module is greater than a preset power.

9. A charging station, characterized in that: include: A grid-connected cabinet, a power distribution cabinet, a microgrid controller and at least one charging pile; wherein, One side of the grid-connected cabinet is connected to the grid-connected point and the sampling end of the microgrid controller; The other side of the grid cabinet is connected to one side of the power distribution cabinet; The other side of the power distribution cabinet is connected to the grid side interface of the charging pile; The charging pile is a charging pile as claimed in any one of claims 1 to 8; The power supply end of the microgrid controller is connected in parallel with the power supply end of the charge and discharge controller in any one of the charging piles; The grid-connected cabinet is controlled by the microgrid controller, and the microgrid controller is communicatively connected with the charge and discharge controller.

10. The charging station according to claim 9, characterized in that When the number of the charging piles is greater than 1, the charging piles share the same battery system, and the battery system is independently arranged outside the charging piles.

11. The charging station according to claim 10, characterized in that: Each of the charging piles shares the same second bidirectional charging and discharging module, and the second bidirectional charging and discharging module is independently arranged outside each of the charging piles.

12. The charging station according to claim 11, characterized in that In each of the charging piles, the DC side of the first bidirectional charging and discharging module is connected to the second bidirectional charging and discharging module through a corresponding switch.

13. The charging station according to any one of claims 10 to 12, characterized in that: The charging piles share the same backup auxiliary power supply, which is independently arranged outside the charging piles, and the power supply end of the microgrid controller is connected in parallel with the power supply end of each charging and discharging controller.

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