New energy vehicle charging circuit and charging pile

Abstract

The utility model provides a new energy vehicle charging circuit and a charging pile, and relates to the technical field of charging piles, the circuit comprises a first charging device, a second charging device, a switching contactor group and a main control board, the first charging device comprises a first charging protection assembly and a first charging output assembly which are connected in series; the second charging device comprises a second charging protection assembly and a second charging output assembly which are connected in series; the main control board is connected with the first charging protection assembly and the second charging protection assembly. The switching contactor group is respectively connected with a first connecting assembly between the first charging protection assembly and the first charging output assembly and a second connecting assembly between the second charging protection assembly and the second charging output assembly; and the switching contactor group is used for establishing a charging circuit between the target charging output assembly corresponding to the fault charging protection assembly and other charging protection assemblies based on the charging switching signal. According to the utility model, the usability and the charging efficiency of the DC charging pile can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of charging piles, and in particular to a charging circuit and a charging pile for a new energy vehicle. Background Art

[0002] With the gradual popularization of new energy vehicles, new energy charging piles are widely installed in public buildings, parking lots, shopping malls, charging stations, residential communities and other places, and different types of new energy vehicles are charged according to different voltage levels.

[0003] At present, new energy charging piles generally include AC charging piles, DC charging piles and wireless charging piles. In DC charging piles, each DC charging gun is equipped with a fuse module, which uses a disposable fuse. When overcurrent occurs, that is, when the current exceeds the limit value that the disposable fuse can withstand, the disposable fuse will blow, thereby protecting the subsequent circuit. However, if the disposable fuse of the DC charging gun is damaged, if the user uses the faulty DC charging gun, charging will not be possible, resulting in low usability and charging efficiency of the DC charging pile. Utility Model Content

[0004] The utility model provides a charging circuit and a charging pile for a new energy vehicle, which are used to solve the defects in the prior art that a DC charging gun cannot be charged after a disposable fuse is damaged, resulting in low usability and charging efficiency of the DC charging pile, and improve the usability and charging efficiency of the DC charging pile.

[0005] The utility model provides a new energy vehicle charging circuit, comprising: a first charging device, a second charging device, a switching contactor group and a main control board, wherein:

[0006] The first charging device comprises a first charging protection component and a first charging output component connected in series; the second charging device comprises a second charging protection component and a second charging output component connected in series;

[0007] The main control board is connected to the first charging protection component and the second charging protection component respectively, and the main control board is used to determine the faulty charging protection component and generate a charging switching signal when the fuse corresponding to the first charging protection component or the second charging protection component fails;

[0008] The switching contactor group respectively connects the first connection component between the first charging protection component and the first charging output component, and the second connection component between the second charging protection component and the second charging output component; the switching contactor group is used to establish a charging circuit between the target charging output component corresponding to the faulty charging protection component and other charging protection components based on the charging switching signal.

[0009] According to the new energy vehicle charging circuit provided by the utility model, the first connection component includes a first positive connection point and a first negative connection point, and the second connection component includes a second positive connection point and a second negative connection point, wherein:

[0010] The first positive connection point is a connection point between a first end corresponding to the first charging protection component and a first end corresponding to the first charging output component, the first negative connection point is a connection point between a second end corresponding to the first charging protection component and a second end corresponding to the first charging output component, the second positive connection point is a connection point between a first end corresponding to the second charging protection component and a first end corresponding to the second charging output component, and the second negative connection point is a connection point between a second end corresponding to the second charging protection component and a second end corresponding to the second charging output component.

[0011] According to the new energy vehicle charging circuit provided by the utility model, the switching contactor group includes a positive DC switching contactor and a negative DC switching contactor, wherein:

[0012] The positive DC switching contactor is connected to the first positive connection point and the second positive connection point respectively;

[0013] The negative DC switching contactor is connected to the first negative connection point and the second negative connection point respectively, and the control ends corresponding to the positive DC switching contactor and the negative DC switching contactor are connected to the main control board.

[0014] According to the new energy vehicle charging circuit provided by the utility model, the first charging protection component includes a first fuse, a first shunt and a first charging module, wherein:

[0015] The first end of the first fuse serves as the first end of the first charging protection component, the second end of the first fuse is connected to the positive electrode of the first charging module, and the first fuse is connected to the main control board based on a cable;

[0016] The first end of the first shunt serves as the second end of the first charging protection component, the second end of the first shunt is connected to the negative electrode of the first charging module, and the communication end of the first charging module is connected to the main control board.

[0017] According to the new energy vehicle charging circuit provided by the utility model, the first charging output component includes a first DC contactor, a second DC contactor and a first DC charging gun, wherein:

[0018] The first end of the first DC contactor serves as the first end of the first charging output component, the second end of the first DC contactor is connected to the positive electrode of the first DC charging gun, and the control end of the first DC contactor is connected to the main control board;

[0019] The first end of the second DC contactor serves as the second end of the first charging output component, the second end of the second DC contactor is connected to the negative electrode of the first DC charging gun, and the control end of the second DC contactor is connected to the main control board;

[0020] The first DC charging gun is connected to the main control board via a cable.

[0021] According to the new energy vehicle charging circuit provided by the utility model, the second charging protection component includes a second fuse, a second shunt, and a second charging module, wherein:

[0022] The first end of the second fuse serves as the first end of the second charging protection component, the second end of the second fuse is connected to the positive electrode of the second charging module, and the second fuse is connected to the main control board based on a cable;

[0023] The first end of the second shunt serves as the second end of the second charging protection component, the second end of the second shunt is connected to the negative electrode of the second charging device, and the communication end of the second charging module is connected to the main control board.

[0024] According to the new energy vehicle charging circuit provided by the utility model, the second charging output component includes a third DC contactor, a fourth DC contactor, and a second DC charging gun, wherein:

[0025] The first end of the third DC contactor serves as the first end of the second charging output component, the second end of the third DC contactor is connected to the positive electrode of the second DC charging gun, and the control end of the third DC contactor is connected to the main control board;

[0026] The first end of the fourth DC contactor serves as the second end of the first charging output component, the second end of the fourth DC contactor is connected to the negative electrode of the second DC charging gun, and the control end of the fourth DC contactor is connected to the main control board;

[0027] The second DC charging gun is connected to the main control board via a cable.

[0028] According to the new energy vehicle charging circuit provided by the utility model, the new energy vehicle charging circuit also includes a DC electric energy meter, a communication end of the DC electric energy meter is connected to the main control board, a first end of the DC electric energy meter is connected to the first positive pole connection point, a second end of the DC electric energy meter is connected to the first end of the first shunt, a third end of the DC electric energy meter is respectively connected to the second end of the first shunt and the negative pole of the first charging module, a fourth end of the DC electric energy meter is connected to the second positive pole connection point, a fifth end of the DC electric energy meter is connected to the first end of the second shunt, and a sixth end of the DC electric energy meter is respectively connected to the negative pole of the second charging module and the second end of the second shunt.

[0029] According to the new energy vehicle charging circuit provided by the utility model, the main control board is also connected to the new energy vehicle.

[0030] The utility model also provides a charging pile, comprising at least one new energy vehicle charging circuit as described in any one of the above items.

[0031] The new energy vehicle charging circuit and charging pile provided by the utility model are respectively connected to the first charging protection component in the first charging device and the second charging protection component in the second charging device through the main control board, and are respectively connected to the first connection component between the first charging protection component and the first charging output component, and the second connection component between the second charging protection component and the second charging output component through the switching contactor group. In the case that the fuse corresponding to the first charging protection component or the second charging protection component fails, the main control board can determine the faulty charging protection component and generate a charging switching signal. The switching contactor group can establish a charging circuit between the target charging output component corresponding to the faulty charging protection component and other charging protection components according to the charging switching signal. The charging circuit serving as a backup for the faulty charging protection component is used to charge the new energy vehicle, thereby avoiding the user from wasting time by repeatedly moving the car to find a normal charging pile, thereby improving the charging efficiency and the usability of the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0033] Figure 1 This is one of the structural schematic diagrams of the new energy vehicle charging circuit provided by the embodiment of the utility model;

[0034] Figure 2 This is the second structural schematic diagram of the new energy vehicle charging circuit provided by the embodiment of the utility model;

[0035] Figure 3 This is the third structural schematic diagram of the new energy vehicle charging circuit provided by the embodiment of the utility model;

[0036] Figure 4 This is the fourth structural schematic diagram of the new energy vehicle charging circuit provided by the embodiment of the utility model.

[0037] Reference numerals:

[0038] 100: first charging device; 110: first charging protection component; 111: first fuse; 112: first shunt; 113: first charging module; 120: first charging output component; 121: first DC contactor; 122: second DC contactor; 123: first DC charging gun; 200: second charging device; 210: second charging protection component; 211: second fuse; 212: second shunt; 213: second charging module; 120: first charging output component; 220: second charging output component; 221: third DC contactor; 222: fourth DC contactor; 223: second DC charging gun; 300: switching contactor group; 310: positive DC switching contactor; 320: negative DC switching contactor; 400: first connecting component; 500: second connecting component; 600: main control board; 700: DC energy meter. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] Aiming at the problem in the prior art that the DC charging gun cannot be charged after the disposable fuse is damaged, resulting in low usability and charging efficiency of the DC charging pile, the embodiment of the utility model provides a new energy vehicle charging circuit. Figure 1 This is one of the structural schematic diagrams of the new energy vehicle charging circuit provided by the embodiment of the utility model. Figure 1 As shown, the new energy vehicle charging circuit includes: a first charging device 100, a second charging device 200, a switching contactor group 300 and a main control board 600, wherein:

[0041] The first charging device 100 includes a first charging protection component 110 and a first charging output component 120 connected in series; the second charging device 200 includes a second charging protection component 210 and a second charging output component 220 connected in series;

[0042] The main control board 600 is connected to the first charging protection component 110 and the second charging protection component 210 respectively, and the main control board 600 is used to determine the faulty charging protection component and generate a charging switching signal when the fuse corresponding to the first charging protection component 110 or the second charging protection component 210 is faulty;

[0043] The switching contactor group 300 respectively connects the first connection component 400 between the first charging protection component 110 and the first charging output component 120, and the second connection component 500 between the second charging protection component 210 and the second charging output component 220; the switching contactor group 300 is used to establish a charging circuit between the target charging output component corresponding to the faulty charging protection component and other charging protection components based on the charging switching signal.

[0044] Specifically, the first charging device 100 includes a first charging protection component 110 and a first charging output component 120, and the first charging protection component 110 is connected in series with the first charging output component 120. The first charging protection component 110 is used to obtain electric energy from the power grid and transmit it to the first charging output component 120. The first charging output component 120 charges the new energy vehicle after being connected to the charging interface of the new energy vehicle. The second charging device 200 has the same structure as the first charging device 100, that is, the second charging device 200 includes a second charging protection component 210 and a second charging output component 220, and the second charging protection component 210 is connected in series with the second charging output component 220. The second charging protection component 210 is used to obtain electric energy from the power grid and transmit it to the second charging output component 220. The second charging output component 220 charges the new energy vehicle after being connected to the charging interface of the new energy vehicle. The first charging protection component 110 and the second charging protection component 210 are respectively provided with a fuse, which is a disposable fuse. After the fuse in the first charging protection component 110 or the second charging protection component 210 is damaged due to factors such as overcurrent, the charging path corresponding to the first charging device 100 or the second charging device 200 is in an open circuit state. When the user charges the new energy vehicle through the faulty first charging device 100 or the second charging device 200, it is impossible to charge. The user needs to repeatedly move the car to find a charging device that works normally, resulting in poor charging efficiency, user experience and ease of use of the charging pile. Therefore, in the embodiment of the utility model, a switching contactor group 300 is set between the first connecting component 400 between the first charging protection component 110 and the first charging output component 120, and the second connecting component 500 between the second charging protection component 210 and the second charging output component 220, and the control end of the switching contactor group 300 is connected to the main control board 600 ( Figure 1 (not shown). In the case that the fuses corresponding to the first charging protection component 110 or the second charging protection component 210 are damaged, the main control board 600 can determine the faulty charging protection component, generate a charging switching signal, and send the charging switching signal to the switching contactor group 300, and control the on-off state of the switching contactor group 300 so that the target charging output component connected to the faulty charging protection component is connected to other charging protection components, thereby constructing a new charging circuit to charge the new energy vehicle.

[0045] It should be noted that, in the event of a fuse failure in the first charging protection component 110, the faulty charging protection component is the first charging protection component 110, the target charging output component is the first charging output component 120, and the other charging protection components are the second charging protection component 210. The second charging protection component 210, the switching contactor group 300 and the first charging output component 120 construct a new charging circuit, that is, the second charging protection component 210 transmits electrical energy to the first charging output component 120 through the switching contactor group 300, and the first charging output component 120 can charge new energy vehicles. In the event of a fuse failure in the second charging protection component 210, the faulty charging protection component is the second charging protection component 210, the target charging output component is the second charging output component 220, and the other charging protection components are the first charging protection component 110. The first charging protection component 110, the switching contactor group 300 and the second charging output component 220 construct a new charging circuit, that is, the first charging protection component 110 transmits electrical energy to the second charging output component 220 through the switching contactor group 300, and the second charging output component 220 can charge new energy vehicles.

[0046] It should be noted that the new energy vehicle charging circuit provided by the utility model is applied to a DC charging pile, which includes at least two charging devices, and the structure of each charging device is the same as that of the first charging device 100 or the second charging device 200. The first charging device 100 and the second charging device 200 are any two charging devices in the DC charging pile, and it is necessary to ensure that there is a normally functioning charging device in the first charging device 100 and the second charging device 200, that is, in the case of a failure of the first charging device 100, the second charging device 200 works normally, or in the case of a failure of the second charging device 200, the first charging device 100 works normally. In addition, it is necessary to ensure that the normally functioning charging device in the first charging device 100 and the second charging device 200 is not used by the user.

[0047] Optionally, the main control board 600 can be connected to the first charging protection component 110 and the second charging protection component 210 respectively through a CAN (Controller Area Network) bus.

[0048] Further, Figure 2 This is the second structural diagram of the new energy vehicle charging circuit provided by the embodiment of the utility model. Figure 2 As shown, the first connection assembly 400 includes a first positive electrode connection point A1 and a first negative electrode connection point B1, and the second connection assembly 500 includes a second positive electrode connection point A2 and a second negative electrode connection point B2, wherein:

[0049] The first positive connection point A1 is a connection point between the first end corresponding to the first charging protection component 110 and the first end corresponding to the first charging output component 120, the first negative connection point B1 is a connection point between the second end corresponding to the first charging protection component 110 and the second end corresponding to the first charging output component 120, the second positive connection point A2 is a connection point between the first end corresponding to the second charging protection component 210 and the first end corresponding to the second charging output component 220, and the second negative connection point B2 is a connection point between the second end corresponding to the second charging protection component 210 and the second end corresponding to the second charging output component 220.

[0050] Furthermore, if Figure 2 As shown, the switching contactor group 300 includes a positive DC switching contactor 310 and a negative DC switching contactor 320, wherein:

[0051] The positive DC switching contactor 310 is connected to the first positive connection point A1 and the second positive connection point A2 respectively;

[0052] The negative DC switching contactor 320 is connected to the first negative connection point B1 and the second negative connection point B2 respectively, and the control terminals corresponding to the positive DC switching contactor 310 and the negative DC switching contactor 320 are connected to the main control board 600 .

[0053] Specifically, in the embodiment of the utility model, the positive DC switching contactor 310 in the switching contactor group 300 is connected to the first positive connection point A1 and the second positive connection point A2, respectively, and the negative DC switching contactor 320 in the switching contactor group 300 is connected to the first negative connection point B1 and the second negative connection point B2, respectively. In the case of a fuse failure in the first charging protection component 110, the charging path between the first charging output component 120 and the first charging protection component 110 is in a disconnected state, and the main control board 600 can send a control signal to the positive DC switching contactor 310 and the negative DC switching contactor 320, so that the positive DC switching contactor 310 and the negative DC switching contactor 320 are both in a closed state, and the normally working second charging protection component 210 can form a new charging circuit with the positive DC switching contactor 310, the negative DC switching contactor 320 and the first charging output component 120, and the second charging protection component 210 can output electric energy to the first charging output component 120, so that the first charging output component 120 charges the new energy vehicle. In addition, in the event of a fuse failure in the second charging protection component 210, the charging path between the second charging output component 220 and the second charging protection component 210 is in a disconnected state, and the main control board 600 can send a control signal to the positive DC switching contactor 310 and the negative DC switching contactor 320, so that the positive DC switching contactor 310 and the negative DC switching contactor 320 are both in a closed state. The normally operating first charging protection component 110 can form a new charging circuit with the positive DC switching contactor 310, the negative DC switching contactor 320 and the second charging output component 220, and the first charging protection component 110 can output electrical energy to the second charging output component 220, so that the second charging output component 220 charges the new energy vehicle.

[0054] Further, Figure 3 This is the third structural diagram of the new energy vehicle charging circuit provided by the embodiment of the utility model, such as Figure 3 As shown, the first charging protection component 110 includes a first fuse 111, a first shunt 112 and a first charging module 113, wherein:

[0055] The first end of the first fuse 111 serves as the first end of the first charging protection component 110, the second end of the first fuse 111 is connected to the positive electrode of the first charging module 113, and the first fuse 111 is connected to the main control board 600 based on a cable;

[0056] The first end of the first shunt 112 serves as the second end of the first charging protection component 110 , the second end of the first shunt 112 is connected to the negative electrode of the first charging module 113 , and the communication end of the first charging module 113 is connected to the main control board 600 .

[0057] Specifically, the first fuse 111 is a one-time fuse, which is used to quickly melt when overcurrent occurs, and timely cut off the charging path in the first charging device 100. The second end of the first shunt 112 is connected to the negative electrode of the first charging module 113. The first shunt 112 is used to divide the large current of the charging path in the first charging device 100 into a smaller current, which is convenient for the current size of the charging path and provides real-time current measurement data for the first charging module 113 and the main control board 600. The first charging module 113 is connected to the power grid to obtain electrical energy from the power grid, and use the electrical energy in the power grid to provide stable charging current and voltage for the new energy vehicle.

[0058] Optionally, the first fuse 111 is connected to the main control board 600 via a cable, and the first fuse 111 can feed back its own status signal to the main control board 600 via the cable, and the main control board 600 can determine the operating status of the first fuse 111 according to the status signal. For example, after the main control board 600 receives the status signal corresponding to the first fuse 111, if the status signal is 1, it indicates that the first fuse 111 is working normally; if the status signal is 0, it indicates that the first fuse 111 is damaged and the first charging device 100 fails.

[0059] Optionally, the first charging module 113 can convert the alternating current in the power grid into direct current, thereby providing a stable direct current charging current and voltage for the new energy vehicle.

[0060] Furthermore, if Figure 3 The first charging output component 120 includes a first DC contactor 121, a second DC contactor 122 and a first DC charging gun 123, wherein:

[0061] The first end of the first DC contactor 121 serves as the first end of the first charging output component 120, the second end of the first DC contactor 121 is connected to the positive electrode of the first DC charging gun 123, and the control end of the first DC contactor 121 is connected to the main control board 600;

[0062] The first end of the second DC contactor 122 serves as the second end of the first charging output component 120 , the second end of the second DC contactor 122 is connected to the negative electrode of the first DC charging gun 123 , and the control end of the second DC contactor 122 is connected to the main control board 600 ;

[0063] The first DC charging gun 123 is connected to the main control board 600 via a cable.

[0064] Optionally, the first DC charging gun 123 can be connected to the main control board 600 via a cable. When the user plugs in and out the first DC charging gun 123, the first DC charging gun 123 can handshake with the new energy vehicle and upload a connection signal to the main control board 600 via the cable. The main control board 600 can determine whether the connection between the first DC charging gun 123 and the new energy vehicle is completed based on the connection signal.

[0065] Furthermore, if Figure 3 The second charging protection component 210 includes a second fuse 211, a second shunt 212, and a second charging module 213, wherein:

[0066] The first end of the second fuse 211 serves as the first end of the second charging protection component 210, the second end of the second fuse 211 is connected to the positive electrode of the second charging module 213, and the second fuse 211 is connected to the main control board 600 based on a cable;

[0067] The first end of the second shunt 212 serves as the second end of the second charging protection component 210 , the second end of the second shunt 212 is connected to the negative pole of the second charging module 213 , and the communication end of the second charging module 213 is connected to the main control board 600 .

[0068] Specifically, the second fuse 211 is a one-time fuse, which is used to quickly melt when overcurrent occurs, and timely cut off the charging path in the second charging device 200. The second end of the second shunt 212 is connected to the negative electrode of the second charging module 213. The second shunt 212 is used to divide the large current of the charging path in the second charging device 200 into a smaller current, which is convenient for the current size of the charging path and provides real-time current measurement data for the second charging module 213 and the main control board 600. The second charging module 213 is connected to the power grid to obtain electrical energy from the power grid, and use the electrical energy in the power grid to provide stable charging current and voltage for the new energy vehicle.

[0069] Optionally, the second fuse 211 is connected to the main control board 600 via a cable, and the second fuse 211 can feed back its own status signal to the main control board 600 via the cable, and the main control board 600 can determine the operating status of the second fuse 211 according to the status signal.

[0070] Optionally, the second charging module 213 can convert the alternating current in the power grid into direct current, thereby providing a stable direct current charging current and voltage for the new energy vehicle.

[0071] Furthermore, if Figure 3 The second charging output component 220 includes a third DC contactor 221, a fourth DC contactor 222 and a second DC charging gun 223, wherein:

[0072] The first end of the third DC contactor 221 serves as the first end of the second charging output component 220, the second end of the third DC contactor 221 is connected to the positive electrode of the second DC charging gun 223, and the control end of the third DC contactor 221 is connected to the main control board 600;

[0073] The first end of the fourth DC contactor 222 serves as the second end of the first charging output component 120, the second end of the fourth DC contactor 222 is connected to the negative electrode of the second DC charging gun 223, and the control end of the fourth DC contactor 222 is connected to the main control board 600;

[0074] The second DC charging gun 223 is connected to the main control board 600 via a cable.

[0075] Optionally, the second DC charging gun 223 can be connected to the main control board 600 via a cable. When the user plugs in and out the second DC charging gun 223, the second DC charging gun 223 can handshake with the new energy vehicle and upload a connection signal to the main control board 600 via the cable. The main control board 600 can determine whether the connection between the second DC charging gun 223 and the new energy vehicle is completed based on the connection signal.

[0076] For example, Figure 3 As described above, taking the damage of the first fuse 111 as an example, since the first fuse 111 cuts off the charging path between the positive electrode of the first charging module 113 and the first positive electrode connection point A1, even if the main control board 600 controls the first DC contactor 121 and the second DC contactor 122 to be fully closed, the charging path in the first charging device 100 is still in an open circuit state. At this time, when the user plugs in and unplugs the first DC charging gun 123, and the second DC charging gun 223 is not plugged in and unplugged, the first DC charging gun 123 establishes a handshake connection with the new energy vehicle. After the first DC charging gun 123 successfully handshakes with the new energy vehicle, first, the main control board 600 can control the third DC contactor 221 and the fourth DC contactor 222 to be disconnected, so as to prevent the second charging module 213 from transmitting electric energy to the second DC charging gun 223 through the third DC contactor 221 and the fourth DC contactor 222. Afterwards, the main control board 600 can control the first DC contactor 121, the second DC contactor 122, the positive DC switching contactor 310 and the negative DC switching contactor 320 to be closed. The second charging module 213, the normally operating second fuse 211, the positive DC switching contactor 310, the first DC contactor 121, the first DC charging gun 123, the second DC contactor 122, the negative DC switching contactor 320 and the second shunt 212 form a new charging path, transmit electric energy to the first DC charging gun 123 through the second charging module 213, and charge the new energy vehicle connected to the first DC charging gun 123.

[0077] For example, Figure 3 As described above, taking the damage of the second fuse 211 as an example, since the second fuse 211 cuts off the charging path between the positive electrode of the second charging module 213 and the second positive electrode connection point A2, even if the main control board 600 controls the third DC contactor 221 and the fourth DC contactor 222 to be fully closed, the charging path in the second charging device 200 is still in an open circuit state. At this time, when the user plugs in and uses the second DC charging gun 223, and the first DC charging gun 123 is not plugged in and used, the second DC charging gun 223 establishes a handshake connection with the new energy vehicle. After the second DC charging gun 223 successfully handshakes with the new energy vehicle, first, the main control board 600 can control the first DC contactor 121 and the second DC contactor 122 to be disconnected, so as to prevent the first charging module 113 from transmitting electric energy to the first DC charging gun 123 through the first DC contactor 121 and the second DC contactor 122. Afterwards, the main control board 600 can control the third DC contactor 221, the fourth DC contactor 222, the positive DC switching contactor 310 and the negative DC switching contactor 320 to be closed. The first charging module 113, the normally operating first fuse 111, the positive DC switching contactor 310, the third DC contactor 221, the second DC charging gun 223, the fourth DC contactor 222, the negative DC switching contactor 320 and the first shunt 112 form a new charging path, transmit electric energy to the second DC charging gun 223 through the first charging module 113, and charge the new energy vehicle connected to the second DC charging gun 223.

[0078] Optionally, the main control board 600 is also connected to the new energy vehicle, that is, the main control board 600 is connected to the new energy vehicle through a cable.

[0079] Further, Figure 4 This is the fourth structural diagram of the new energy vehicle charging circuit provided by the embodiment of the utility model, such as Figure 4 As shown, the new energy vehicle charging circuit also includes a DC energy meter 700, the communication end of the DC energy meter 700 is connected to the main control board 600; the first end of the DC energy meter 700 is connected to the first positive connection point A1; the second end of the DC energy meter 700 is connected to the first end of the first shunt 112, the third end of the DC energy meter 700 is respectively connected to the second end of the first shunt 112 and the negative pole of the first charging module 113, the fourth end of the DC energy meter 700 is connected to the second positive connection point A2, the fifth end of the DC energy meter 700 is connected to the first end of the second shunt 212, and the sixth end of the DC energy meter 700 is respectively connected to the negative pole of the second charging module 213 and the second end of the second shunt 212.

[0080] Specifically, the new energy vehicle charging circuit also includes a DC energy meter 700, which is used to determine the electric energy actually consumed in the charging process of the new energy vehicle. The DC energy meter 700 includes a C-circuit measurement circuit and a D-circuit measurement circuit, wherein:

[0081] 1) The C-circuit measurement circuit includes a first end of a DC energy meter 700 connected to a first positive connection point A1, a second end of the DC energy meter 700 connected to a first end of a first shunt 112 in a first charging protection component 110, and a third end of the DC energy meter 700 connected to a second end of the first shunt 112. In the case where the second fuse 211 is damaged, the DC energy meter 700 can measure the first degree of the first charging module 113 before the new energy vehicle is charged as X1 through the C-circuit measurement circuit, and measure the second degree of the first charging module 113 as X2 after the new energy vehicle is charged. Then, the actual electric energy consumed during the charging process of the new energy vehicle is (X2-X1).

[0082] 2) The D-circuit measurement circuit includes a fourth end of the DC energy meter 700 connected to the second positive connection point A2, a fifth end of the DC energy meter 700 connected to the first end of the second shunt 212 in the second charging protection component 210, and a sixth end of the DC energy meter 700 connected to the second end of the second shunt 212. In the case where the first fuse 111 is damaged, the DC energy meter 700 can measure the third degree of the second charging module 213 before the new energy vehicle is charged as X3 through the D-circuit measurement circuit, and measure the fourth degree of the second charging module 213 as X4 after the new energy vehicle is charged. Then, the actual electric energy consumed during the charging process of the new energy vehicle is (X4-X3).

[0083] Optionally, the DC power meter 700 may be connected to the main control board 600 via an RS485 bus, and the DC power meter 700 may send the measured power data to the main control board 600 in real time via the RS485 bus.

[0084] The new energy vehicle charging circuit provided by the utility model is respectively connected to the first charging protection component in the first charging device and the second charging protection component in the second charging device through the main control board, and is respectively connected to the first connection component between the first charging protection component and the first charging output component, and the second connection component between the second charging protection component and the second charging output component through the switching contactor group. In the case that the fuse corresponding to the first charging protection component or the second charging protection component fails, the main control board can determine the faulty charging protection component and generate a charging switching signal. The switching contactor group can establish a charging circuit between the target charging output component corresponding to the faulty charging protection component and other charging protection components according to the charging switching signal. The charging circuit serving as a backup for the faulty charging protection component is used to charge the new energy vehicle, thereby avoiding the user from wasting time by repeatedly moving the car to find a normal charging pile, thereby improving the charging efficiency and the usability of the charging pile.

[0085] An embodiment of the utility model also provides a charging pile, comprising at least one new energy vehicle charging circuit as described in any one of the above items.

[0086] It should be noted that the charging pile is a DC charging pile, and the charging pile includes at least two charging devices.

[0087] For example, taking the case where the charging pile includes three charging devices, namely, charging device 1, charging device 2 and charging device 3, and the fuse in charging device 1 is damaged, the charging pile may include one or two new energy vehicle charging circuits. In the case where the charging pile includes one new energy vehicle charging circuit, the new energy vehicle charging circuit may be constructed based on charging device 1 and charging device 2, or may be constructed based on charging device 1 and charging device 3. In the case where the charging pile includes two new energy vehicle charging circuits, charging device 1 may respectively construct two new energy vehicle charging circuits with charging device 2 and charging device 3. At this time, after the user plugs in and unplugs the DC charging gun 1 corresponding to the charging device 1, any new energy vehicle charging circuit may be selected from the new energy vehicle charging circuits corresponding to the charging device 2 and the charging device 3 as a backup charging circuit for charging, or the target new energy charging circuit corresponding to the target charging device not used by the user may be selected as a backup charging circuit for charging.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A new energy vehicle charging circuit, characterized in that: include: A first charging device, a second charging device, a switching contactor group and a main control board, wherein: The first charging device comprises a first charging protection component and a first charging output component connected in series; the second charging device comprises a second charging protection component and a second charging output component connected in series; The main control board is connected to the first charging protection component and the second charging protection component respectively, and the main control board is used to determine the faulty charging protection component and generate a charging switching signal when the fuse corresponding to the first charging protection component or the second charging protection component fails; The switching contactor group respectively connects the first connection component between the first charging protection component and the first charging output component, and the second connection component between the second charging protection component and the second charging output component; the switching contactor group is used to establish a charging circuit between the target charging output component corresponding to the faulty charging protection component and other charging protection components based on the charging switching signal.

2. The new energy vehicle charging circuit according to claim 1, characterized in that: The first connection assembly includes a first positive connection point and a first negative connection point, and the second connection assembly includes a second positive connection point and a second negative connection point, wherein: The first positive connection point is a connection point between a first end corresponding to the first charging protection component and a first end corresponding to the first charging output component, the first negative connection point is a connection point between a second end corresponding to the first charging protection component and a second end corresponding to the first charging output component, the second positive connection point is a connection point between a first end corresponding to the second charging protection component and a first end corresponding to the second charging output component, and the second negative connection point is a connection point between a second end corresponding to the second charging protection component and a second end corresponding to the second charging output component.

3. The new energy vehicle charging circuit according to claim 2, characterized in that: The switching contactor group includes a positive DC switching contactor and a negative DC switching contactor, wherein: The positive DC switching contactor is connected to the first positive connection point and the second positive connection point respectively; The negative DC switching contactor is connected to the first negative connection point and the second negative connection point respectively, and the control ends corresponding to the positive DC switching contactor and the negative DC switching contactor are connected to the main control board.

4. The new energy vehicle charging circuit according to claim 2 or 3, characterized in that: The first charging protection component includes a first fuse, a first shunt and a first charging module, wherein: The first end of the first fuse serves as the first end of the first charging protection component, the second end of the first fuse is connected to the positive electrode of the first charging module, and the first fuse is connected to the main control board based on a cable; The first end of the first shunt serves as the second end of the first charging protection component, the second end of the first shunt is connected to the negative electrode of the first charging module, and the communication end of the first charging module is connected to the main control board.

5. The new energy vehicle charging circuit according to any one of claims 1 to 3, characterized in that: The first charging output component includes a first DC contactor, a second DC contactor and a first DC charging gun, wherein: The first end of the first DC contactor serves as the first end of the first charging output component, the second end of the first DC contactor is connected to the positive electrode of the first DC charging gun, and the control end of the first DC contactor is connected to the main control board; The first end of the second DC contactor serves as the second end of the first charging output component, the second end of the second DC contactor is connected to the negative electrode of the first DC charging gun, and the control end of the second DC contactor is connected to the main control board; The first DC charging gun is connected to the main control board via a cable.

6. The new energy vehicle charging circuit according to claim 4, characterized in that: The second charging protection component includes a second fuse, a second shunt and a second charging module, wherein: The first end of the second fuse serves as the first end of the second charging protection component, the second end of the second fuse is connected to the positive electrode of the second charging module, and the second fuse is connected to the main control board based on a cable; The first end of the second shunt serves as the second end of the second charging protection component, the second end of the second shunt is connected to the negative electrode of the second charging device, and the communication end of the second charging module is connected to the main control board.

7. The new energy vehicle charging circuit according to any one of claims 1 to 3, characterized in that: The second charging output component includes a third DC contactor, a fourth DC contactor, and a second DC charging gun, wherein: The first end of the third DC contactor serves as the first end of the second charging output component, the second end of the third DC contactor is connected to the positive electrode of the second DC charging gun, and the control end of the third DC contactor is connected to the main control board; The first end of the fourth DC contactor serves as the second end of the first charging output component, the second end of the fourth DC contactor is connected to the negative electrode of the second DC charging gun, and the control end of the fourth DC contactor is connected to the main control board; The second DC charging gun is connected to the main control board via a cable.

8. The new energy vehicle charging circuit according to claim 6, characterized in that: The new energy vehicle charging circuit also includes a DC energy meter, a communication end of the DC energy meter is connected to the main control board, a first end of the DC energy meter is connected to the first positive pole connection point, a second end of the DC energy meter is connected to the first end of the first shunt, a third end of the DC energy meter is respectively connected to the second end of the first shunt and the negative pole of the first charging module, a fourth end of the DC energy meter is connected to the second positive pole connection point, a fifth end of the DC energy meter is connected to the first end of the second shunt, and a sixth end of the DC energy meter is respectively connected to the negative pole of the second charging module and the second end of the second shunt.

9. The new energy vehicle charging circuit according to claim 1, characterized in that: The main control board is also connected to the new energy vehicle.

10. A charging pile, characterized in that: The invention comprises at least one new energy vehicle charging circuit as described in any one of claims 1 to 9.

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