Double-gun direct current charging pile system

Abstract

The utility model relates to a double-gun direct-current charging pile system, which comprises a box body, an alternating-current input loop, a power unit, a direct-current output loop, an auxiliary loop, a control loop, a man-machine interaction unit and a thermal management system, an openable box door is arranged on the front side of the box body, an air outlet is formed in the left side face of the box body, and an air inlet is formed in the right side face of the box body; an auxiliary loop is arranged at the top of the box body, a direct current output loop is arranged below the auxiliary loop, a control loop is arranged below the direct current output loop, an alternating current input loop is arranged below the control loop, a power unit is arranged on the rear side of the control loop, and a man-machine interaction unit is arranged on the box door. According to the utility model, each part is modularized and can be independently installed, so that the standardization and universality of the product are improved, the production of the charging pile is streamlined, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of charging piles, in particular to a double-gun DC charging pile system. Background Art

[0002] Charging piles refer to charging equipment that provides charging services for electric vehicles. They are mainly divided into floor-standing charging piles and wall-mounted charging piles. They mainly adopt charging methods based on time, electricity metering, and amount metering. At present, there is a lack of DC charging piles in the charging pile market. The DC charging piles on the market are all customized products with poor practicality and compatibility, and low efficiency. Since the DC charging piles on the market are all customized products, the design standards are not unified, resulting in the following problems with similar new energy vehicle charging pile products on the market: low product standardization, low product modularization, low commonality of various components, and serious product homogeneity; which further leads to high production costs and uneven product quality. Summary of the invention

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a dual-gun DC charging pile system. In view of the problems of low standardization, low modularization, low commonality of components, uneven quality, etc. of existing products, the product design is standardized and modularized, the commonality of each component of the product is improved, the production consistency of the product is optimized, the product quality is improved, and the production cost is reduced.

[0004] The purpose of the utility model is achieved in this way:

[0005] A dual-gun DC charging pile system, comprising a box body and an AC input circuit, a power unit, a DC output circuit, an auxiliary circuit, a control circuit, a human-machine interaction unit and a thermal management system arranged in the box body; the front side of the box body is provided with an openable door, the left side of the box body is provided with an air outlet, and the right side of the box body is provided with an air inlet;

[0006] The AC input circuit includes a first input copper bar, a molded case circuit breaker, a second input copper bar, an AC contactor, a first miniature circuit breaker, a lightning arrester and a branch terminal. One end of the first input copper bar is connected to a three-phase AC incoming line, and the other end is connected to a molded case circuit breaker, and the molded case circuit breaker controls the power switch of the whole machine; the rear stage of the molded case circuit breaker is connected to the front stage of the AC contactor through the second input copper bar, and the AC contactor is connected to the lightning arrester through the first miniature circuit breaker;

[0007] The power unit includes a power module and a module box. The module box of the power unit can support the installation of no more than 8 modules. The modules are evenly divided into module group A and module group B. The AC input interface of the power module is connected to the branch terminal in the AC input circuit, and the DC output interface of the power module is connected to the DC output circuit.

[0008] The DC output circuit includes fuse A, fuse B, a first DC contactor, a second DC contactor, a third DC contactor, a fourth DC contactor, a fifth DC contactor, a sixth DC contactor, a shunt A, a shunt B, a first output copper bar, a second output copper bar, a third output copper bar and a fourth output copper bar, wherein the first output copper bar, the second output copper bar, the third output copper bar and the fourth output copper bar are connected to the DC output end of the power module, the first output copper bar is connected to the DC output DC- of the module A group in the power module, the second output copper bar is connected to the DC output DC- of another module B group, the third output copper bar is connected to the DC+ of the module A group in the power module, and the fourth output copper bar is connected to the DC+ of another module B group;

[0009] The control loop includes a first main control module, a second main control module, a 150W switching power supply, a 50W switching power supply and a second miniature circuit breaker. The second main control module is connected to the first main control module via RS485. The first main control module is provided with a 12V working power supply by a 50W switching power supply 64 and has a 9-way input detection function.

[0010] The auxiliary circuit includes an electronic lock driving module A, an electronic lock driving module B, a DC contactor A, a DC contactor B, an insulation detection module A, an insulation detection module B, a discharge resistor A and a discharge resistor B. The input end of the electronic lock driving module A is connected to the first main control module of the control circuit, and the output end is connected to the electronic lock driving line of the device A gun, which is used to control the opening and closing of the electronic lock during the charging process of the device; the input end of the electronic lock driving module B is connected to the second main control module, which is used to control the opening and closing of the electronic lock of the B gun during the charging process;

[0011] The human-computer interaction unit includes an LED display module A, an LED display module B, a touch screen and a radio frequency module. The LED display module A is used to display the status of the device A gun, and the LED display module B is used to display the status of the device B gun;

[0012] The thermal management system includes two temperature measuring probes, a heat dissipation fan and a heat dissipation air duct.

[0013] Furthermore, the rear stage of the AC contactor is connected to the branch terminal, which separates one three-phase AC input to the AC input interface of the power module in the power unit; the AC contactor is responsible for controlling the power input of the power unit; the lightning arrester of the AC input circuit also has a normally closed switch connected to the first main control module of the control circuit, and the first main control module performs status detection and alarm output.

[0014] Furthermore, the power module of the power unit is a 20kw AC-DC power module, which is responsible for rectifying the three-phase AC output into DC output; the DC output interface of the power module is connected to the first output copper bus, the second output copper bus, the third output copper bus and the fourth output copper bus in the DC output circuit.

[0015] Furthermore, the fuse A is connected to the first output copper busbar and the inner side of the first DC contactor, and is responsible for the DC+ output circuit of the device A gun; the fuse B is connected to the fourth output copper busbar and the inner side of the second DC contactor, and is responsible for the DC+ output circuit of the device B gun.

[0016] Furthermore, the shunt A is connected to the first output copper bus and the third DC contactor, and is responsible for the DC-output circuit of the device A gun, wherein the shunt A is also connected to the DC power meter A by two wires, and the DC power meter A is responsible for the output measurement of the device A gun; the shunt B is connected to the second output copper bus and the fourth DC contactor, and is responsible for the DC-output circuit of the device B gun, wherein the shunt B is connected to the DC power meter B by two wires, and the DC power meter B is responsible for the output measurement of the device B gun.

[0017] Furthermore, the coils of the first DC contactor, the third DC contactor, the fifth DC contactor and the sixth DC contactor are connected to the first main control module of the control circuit, and the second DC contactor and the fourth DC contactor are connected to the second main control module, and their disconnection and closing are controlled by the control circuit.

[0018] Furthermore, the DC+ and DC- input interfaces on the insulation detection module A are respectively connected to the inner sides of the first DC contactor and the third DC contactor in the DC output circuit, and the insulation performance of the DC output busbar of the device A gun is tested before the pre-charging stage; the insulation detection module B is connected to the inner sides of the second DC contactor and the fourth DC contactor, and the insulation performance of the DC output busbar of the device B gun is tested before the pre-charging stage; the insulation detection module A and the insulation detection module B also have 1 RS485 communication, and are respectively connected to the first main control module and the second main control module in the control circuit, and the detected insulation resistance data is transmitted to the main control module, which is responsible for judgment and alarm.

[0019] Furthermore, the DC contactor A and the discharge resistor A constitute the discharge circuit of the device A gun, and the DC contactor B and the discharge resistor B constitute the discharge circuit of the B gun. When the power is turned off, the charge in the load circuit can be quickly discharged to ensure that the system can respond normally and quickly when it is started next time.

[0020] Furthermore, the two temperature measuring probes of the thermal management system are placed at the air inlet and outlet, and are connected to the first main control module in the control loop. When the temperature exceeds the reliable threshold, the first main control module controls the power module to reduce the output power or disconnect the output; the cooling fan is controlled by the first main control module, and the cooling fan will be started synchronously when charging is started, and heat is dissipated through the designed cooling air duct, thereby reducing the internal temperature of the charging pile, ensuring the normal operation of each component, and improving the safety of the charging pile.

[0021] Furthermore, the first input copper bar, the molded case circuit breaker, the second input copper bar, the AC contactor, the first miniature circuit breaker, the lightning arrester and the branch terminal of the AC input circuit are all arranged on the first mounting plate, the fuse A, the fuse B, the first DC contactor, the second DC contactor, the third DC contactor, the fourth DC contactor, the fifth DC contactor, the sixth DC contactor, the shunt A, the shunt B, the first output copper bar, the second output copper bar, the third output copper bar and the fourth output copper bar of the DC output circuit 4 are all arranged on the second mounting plate, and the electronic lock drive module A, the electronic lock drive module B of the auxiliary circuit Module B, DC contactor A, DC contactor B, insulation detection module A, insulation detection module B, discharge resistor A and discharge resistor B are all arranged on the third mounting board, the first main control module, the second main control module, the 150W switching power supply, the 50W switching power supply and the second miniature circuit breaker of the control loop are all arranged on the fourth mounting board, the LED display module A, the LED display module B, the touch screen and the radio frequency module of the human-computer interaction unit are all arranged on the fifth mounting board; the first mounting board, the second mounting board, the third mounting board and the fourth mounting board are all arranged in the box body, and the fifth mounting board is arranged on the box door.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] The utility model provides a dual-gun DC charging pile system, which consists of an AC input circuit, a control circuit, a DC output circuit, an auxiliary circuit, a human-computer interaction, a power unit and a thermal management unit. Each part is modularized and each part can be installed separately, thereby improving the standardization and versatility of the product, streamlining the production of charging piles, and improving production efficiency. At the same time, due to the standardization of the product, the product can be adjusted according to actual needs, greatly reducing the production design cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model.

[0025] Figure 2 It is a structural schematic diagram of the AC input circuit of the utility model.

[0026] Figure 3It is a structural schematic diagram of the DC output circuit of the utility model.

[0027] Figure 4 It is a structural schematic diagram of the auxiliary circuit of the utility model.

[0028] Figure 5 It is a structural schematic diagram of the control loop of the utility model.

[0029] in:

[0030] Box body 1, air inlet 11, air outlet 12, box door 13, AC input circuit 2, first input copper bar 21, molded case circuit breaker 22, second input copper bar 23, AC contactor 24, first miniature circuit breaker 25, lightning arrester 26, branch terminal 27, first mounting plate 28, surge suppression module 29, power module 31, module box 32, DC output circuit 4, fuse A41, fuse B42, first DC contactor 43, second DC contactor 44, third DC contactor 45, fourth DC contactor 46, fifth DC contactor 47, sixth DC contactor 48, shunt A49, shunt B410, first output copper bar 411, second output copper bar 412, third output copper bar 413, fourth output copper bar 414, first A connecting plate 415, a second connecting plate 416, a second mounting plate 417, an auxiliary circuit 5, an electronic lock driving module A51, an electronic lock driving module B52, a DC contactor A53, a DC contactor B54, an insulation detection module A55, an insulation detection module B56, a discharge resistor A57, a discharge resistor B58, a third mounting plate 59, a control circuit 6, a first main control module 61, a second main control module 62, a 150W switching power supply 63, a 50W switching power supply 64, a second miniature circuit breaker 65, a fourth mounting plate 66, a human-computer interaction unit 7, an LED display module A71, an LED display module B72, a touch screen 73, a radio frequency module 74, a fifth mounting plate 75, a cooling fan 8, a DC power meter A91, and a DC power meter B92. DETAILED DESCRIPTION

[0031] In order to better understand the technical solution of the present invention, the following will be described in detail in conjunction with the relevant illustrations. It should be understood that the following specific embodiments are not intended to limit the specific implementation of the technical solution of the present invention, and are only implementations that can be adopted by the technical solution of the present invention. It should be noted that the description of the positional relationship of each component in this article, such as component A being located above component B, is based on the description of the relative positions of the components in the illustration, and is not intended to limit the actual positional relationship of the components. Example 1

[0032] See also Figure 1-Figure 5 , Figure 1The structural schematic diagram of the utility model is drawn. As shown in the figure, the utility model involves a dual-gun DC charging pile system, which includes a box body 1 and an AC input circuit 2, a power unit, a DC output circuit 4, an auxiliary circuit 5, a control circuit 6, a human-computer interaction unit 7 and a thermal management system arranged in the box body 1;

[0033] The front side of the box body 1 is provided with an openable and closable box door 13, the left side of the box body 1 is provided with an air outlet 12, and the right side is provided with an air inlet 11; the top of the box body 1 is provided with an auxiliary circuit 5, a DC output circuit 4 is provided below the auxiliary circuit 5, a control circuit 6 is provided below the DC output circuit 4, an AC input circuit 2 is provided below the control circuit 6, a power unit is provided on the rear side of the control circuit 6, and a human-computer interaction unit 7 is provided on the box door 13.

[0034] The AC input circuit 2 includes a first input copper bar 21, a molded case circuit breaker 22, a second input copper bar 23, an AC contactor 24, a first miniature circuit breaker 25, a lightning arrester 26, a branch terminal 27 and a surge suppression module 29. The power unit includes a power module 31 and a module box 32. The DC output circuit 4 includes a fuse A41, a fuse B42, a first DC contactor 43, a second DC contactor 44, a third DC contactor 45, a fourth DC contactor 46, a fifth DC contactor 47, a sixth DC contactor 48, a shunt A49, a shunt B410, a first output copper bar 411, a second output copper bar 412, a third output copper bar 413, a fourth output copper bar 414, a 4. A first connecting plate 415 and a second connecting plate 416. The auxiliary circuit 5 includes an electronic lock driving module A51, an electronic lock driving module B52, a DC contactor A53, a DC contactor B54, an insulation detection module A55, an insulation detection module B56, a discharge resistor A57 and a discharge resistor B58. The control circuit 6 includes a first main control module 61, a second main control module 62, a 150W switching power supply 63, a 50W switching power supply 64 and a second miniature circuit breaker 65. The human-computer interaction unit 7 includes an LED display module A71, an LED display module B72, a touch screen 73 and a radio frequency module 74. The thermal management system includes two temperature measuring probes, a cooling fan 8 and a cooling air duct.

[0035] The first input copper bar 21, the molded case circuit breaker 22, the second input copper bar 23, the AC contactor 24, the first miniature circuit breaker 25, the lightning arrester 26, the branch terminal 27 and the surge suppression module 29 of the AC input circuit 2 are all arranged on the first mounting plate 28. One end of the first input copper bar 21 is connected to the three-phase AC incoming line, and the other end is connected to the molded case circuit breaker 22, and the molded case circuit breaker 22 controls the power switch of the whole machine; the rear stage of the molded case circuit breaker 22 is connected to the front stage of the AC contactor 24 through the second input copper bar 23, and the AC contactor 24 is connected to the lightning arrester 26 through the first miniature circuit breaker 25, which ensures the existence of lightning protection function in the AC input circuit. When the lightning arrester 26 fails, the first miniature circuit breaker 25 will be disconnected and tripped to ensure the normal power supply circuit;

[0036] The surge suppression module 29 is connected to both sides of the coil of the AC contactor 24. When the AC contactor 24 is closed or disconnected, a large surge voltage is generated, thereby interfering with the stable operation of the whole machine. The surge suppressor 29 is used to suppress the surge voltage to ensure the stable operation of the system.

[0037] The rear stage of the AC contactor 24 is connected to the branch terminal 27, and the branch terminal 27 separates one three-phase AC input to the AC input interface of the power module 31 in the power unit;

[0038] The AC contactor 24 is responsible for controlling the power input of the power unit, and can disconnect the input of the power unit in time when in standby mode, thereby reducing the standby power consumption;

[0039] The lightning arrester 26 of the AC input circuit 2 also has a normally closed switch connected to the first main control module 61 of the control circuit 6, and the first main control module 61 performs status detection and alarm output.

[0040] The module box 32 of the power unit can support the installation of up to 8 modules, and the 8 modules are evenly divided into module group A and module group B. The power module 31 of the power unit is a 20kw AC-DC power module, which is responsible for rectifying the three-phase AC output into DC output; the AC input interface of the power module 31 is connected to the branch terminal 27 in the AC input circuit 2, and the DC output interface of the power module 31 is connected to the first output copper bus 411, the second output copper bus 412, the third output copper bus 413 and the fourth output copper bus 414 in the DC output circuit 4.

[0041] The fuse A41, fuse B42, first DC contactor 43, second DC contactor 44, third DC contactor 45, fourth DC contactor 46, fifth DC contactor 47, sixth DC contactor 48, shunt A49, shunt B410, first output copper bar 411, second output copper bar 412, third output copper bar 413, fourth output copper bar 414, first connecting plate 415 and second connecting plate 416 of the DC output circuit 4 are all arranged on the second mounting plate 417. The first output copper bar 411 , the second output copper bar 412, the third output copper bar 413 and the fourth output copper bar 414 are connected to the DC output end of the power module 31, the first output copper bar 411 is connected to the DC output DC-phase of 4 modules of group A among the 8 power modules 31, the second output copper bar 412 is connected to the DC output DC-phase of the other 4 modules of group B, the third output copper bar 413 is connected to the DC+phase of 4 modules of group A among the 8 power modules 31, and the fourth output copper bar 414 is connected to the DC+phase of the other 4 modules of group B;

[0042] The fuse A41 is connected to the first output copper bar 411 and the inner side of the first DC contactor 43, and is responsible for the DC+ output circuit of the device A gun. When the device fails and causes current overload, the output can be disconnected immediately; similarly, the fuse B42 is connected to the fourth output copper bar 414 and the inner side of the second DC contactor 44, and is responsible for the DC+ output circuit of the device B gun;

[0043] The shunt A49 is connected to the first output copper bus 411 and the third DC contactor 45, and is responsible for the DC-output circuit of the device A gun, wherein the shunt A49 also has two wires connected to the DC power meter A91, and the DC power meter A91 is responsible for the output measurement of the device A gun, with a precision of level 1; similarly, the shunt B410 is connected to the second output copper bus 412 and the fourth DC contactor 46, and is responsible for the DC-output circuit of the device B gun, wherein the shunt B410 is connected to the DC power meter B92 by two wires, and the DC power meter B92 is responsible for the output measurement of the device B gun, with a precision of level 1; the DC power meter A91 and the DC power meter B92 are respectively arranged on the left and right side walls of the box 1;

[0044] The fifth DC contactor 47 and the sixth DC contactor 48 are intermediate contactors in the DC output circuit of the device, which are used to connect the output of the power unit, and can deliver all the outputs of the module group A and the module group B to the device A gun, and also to the B gun, so as to ensure that the device can guarantee the maximum power output when working on a single circuit;

[0045] The coils of the first DC contactor 43, the third DC contactor 45, the fifth DC contactor 47 and the sixth DC contactor 48 are connected to the first main control module 61 of the control circuit 6, and the second DC contactor 44 and the fourth DC contactor 46 are connected to the second main control module 62, and the control circuit 6 controls their disconnection and closing;

[0046] The first connecting plate 415 and the second connecting plate 416 are respectively arranged at the left and right ends of the second mounting plate 417, and are responsible for connecting the DC contactor coil and the equipment emergency stop normally closed switch in series, optimizing the system wiring and facilitating installation.

[0047] The electronic lock driving module A51, the electronic lock driving module B52, the DC contactor A53, the DC contactor B54, the insulation detection module A55, the insulation detection module B56, the discharge resistor A57 and the discharge resistor B58 of the auxiliary circuit 5 are all arranged on the third mounting plate 59, the input end of the electronic lock driving module A51 is connected to the first main control module 61 of the control circuit 6, and the output end is connected to the electronic lock driving line of the device A gun, which is used to control the opening and closing of the electronic lock during the charging process of the device; similarly, the input end of the electronic lock driving module B52 is connected to the second main control module 62, which is used to control the opening and closing of the electronic lock of the B gun during the charging process;

[0048] The DC+ and DC- input interfaces on the insulation detection module A55 are respectively connected to the inner sides of the first DC contactor 43 and the third DC contactor 45 in the DC output circuit 2, and the insulation performance of the DC output busbar of the device A gun is tested before the pre-charging stage; similarly, the insulation detection module B56 is connected to the inner sides of the second DC contactor 44 and the fourth DC contactor 46, and the insulation performance of the DC output busbar of the device B gun is tested before the pre-charging stage; the insulation detection module A55 and the insulation detection module B56 also have 1 RS485 communication, and are respectively connected to the first main control module 61 and the second main control module 62 in the control circuit 6, and the detected insulation resistance data is transmitted to the main control module, which is responsible for judgment and alarm;

[0049] The DC contactor A53 and the discharge resistor A57 constitute the discharge circuit of the device A gun. Similarly, the DC contactor B54 and the discharge resistor B58 constitute the discharge circuit of the B gun. When the power is turned off, the charge in the load circuit can be quickly discharged to ensure that the system can respond normally and quickly when it is started next time.

[0050] The first main control module 61, the second main control module 62, the 150W switching power supply 63, the 50W switching power supply 64 and the second miniature circuit breaker 65 of the control circuit 6 are all arranged on the fourth mounting plate 66. The first main control module 61 is provided with a 12V working power supply by the 50W switching power supply 64, and has a 9-way input quantity detection function, which is used to detect the states of the molded case circuit breaker 22, the AC contactor 24, the lightning arrester 26 in the AC input circuit 2 and the first DC contactor 43, the third DC contactor 45, the fifth DC contactor 47 and the sixth DC contactor 48 in the DC output circuit 4;

[0051] The first main control module 61 has 8 switch control functions, (1) for controlling the start and stop of the AC fan 8 in the thermal management system; (2) for controlling the opening and closing of the first DC contactor 43, the third DC contactor 45, the fifth DC contactor 47 and the sixth DC contactor 48 in the DC output circuit 4; (3) for controlling the 150W switching power supply 63 to output a 12V auxiliary power supply to the vehicle BMS; (4) for controlling the opening and closing of the discharge module DC contactor A53 of the auxiliary circuit 5, thereby controlling the discharge of the charge in the load circuit to ensure that the system can respond normally and quickly when it is started next time; (5) Used to control the power input of the electronic lock drive module A51 in the auxiliary circuit 5, so as to control the electronic lock drive module to output 12V pulses; (6) There are two temperature detections on the first main control module 61, which are connected to the temperature measurement PT1000 inside the gun line, used to measure the temperature of the gun tip. When the temperature is too high, the DC output circuit can be disconnected immediately; similarly, the second main control module 62 also has 9-way input detection, 8-way switch control, 3-way CAN, 3-way RS485, 1-way ADC and 2-way temperature measurement; the second main control module 62 is also connected to the first main control module 61 via RS485;

[0052] The LED display module A71, LED display module B72, touch screen 73 and radio frequency module 74 of the human-computer interaction unit 7 are all arranged on the fifth mounting plate 75. The LED display module A71 and the LED display module B72 are composed of three-color LEDs: orange power indication, green charging indication and red warning prompt. The LED display module A71 is used to display the status of device A gun, and the LED display module B72 is used to display the status of device B gun; the touch screen 73 uses a 7-inch capacitive touch screen, and the touch screen 73 is connected to the first main control module 61 in the control loop 6 through RS485; the radio frequency module 74 is connected to the first main control module 61 through TTL, and the charging pile can be started and stopped by external card swiping.

[0053] The thermal management system includes two temperature measuring probes, a cooling fan 8 and a cooling air duct. The two temperature measuring probes are placed at the air inlet and the air outlet and are connected to the first main control module 61 in the control loop 6. When the temperature exceeds the reliable threshold, the first main control module 61 controls the power module 31 to reduce the output power or disconnect the output; the cooling fan 8 is controlled by the first main control module 61, and the cooling fan 8 will be started synchronously when charging is started, and heat is dissipated through the designed cooling air duct, thereby reducing the internal temperature of the charging pile, ensuring the normal operation of each component, and improving the safety of the charging pile.

[0054] The first mounting plate 28, the second mounting plate 417, the third mounting plate 59 and the fourth mounting plate 66 are all arranged in the box body 1, and the fifth mounting plate 75 is arranged on the box door 13; the first mounting plate 28, the second mounting plate 417, the third mounting plate 59, the fourth mounting plate 66 and the fifth mounting plate 75 are all detachable sheet metal.

[0055] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. A dual-gun DC charging pile system, characterized by: It includes a box body and an AC input circuit, a power unit, a DC output circuit, an auxiliary circuit, a control circuit, a human-machine interaction unit and a thermal management system arranged in the box body; the front side of the box body is provided with an openable door, the left side of the box body is provided with an air outlet, and the right side of the box body is provided with an air inlet; The AC input circuit includes a first input copper bar, a molded case circuit breaker, a second input copper bar, an AC contactor, a first miniature circuit breaker, a lightning arrester and a branch terminal. One end of the first input copper bar is connected to a three-phase AC incoming line, and the other end is connected to a molded case circuit breaker, and the molded case circuit breaker controls the power switch of the whole machine; the rear stage of the molded case circuit breaker is connected to the front stage of the AC contactor through the second input copper bar, and the AC contactor is connected to the lightning arrester through the first miniature circuit breaker; The power unit includes a power module and a module box. The module box of the power unit can support the installation of no more than 8 modules. The modules are evenly divided into module group A and module group B. The AC input interface of the power module is connected to the branch terminal in the AC input circuit, and the DC output interface of the power module is connected to the DC output circuit. The DC output circuit includes fuse A, fuse B, a first DC contactor, a second DC contactor, a third DC contactor, a fourth DC contactor, a fifth DC contactor, a sixth DC contactor, a shunt A, a shunt B, a first output copper bar, a second output copper bar, a third output copper bar and a fourth output copper bar, wherein the first output copper bar, the second output copper bar, the third output copper bar and the fourth output copper bar are connected to the DC output end of the power module, the first output copper bar is connected to the DC output DC- of the module A group in the power module, the second output copper bar is connected to the DC output DC- of another module B group, the third output copper bar is connected to the DC+ of the module A group in the power module, and the fourth output copper bar is connected to the DC+ of another module B group; The control loop comprises a first main control module, a second main control module, a 150W switching power supply, a 50W switching power supply and a second miniature circuit breaker, wherein the second main control module is connected to the first main control module via RS485; the first main control module is provided with working power by a 50W switching power supply (64) and has a 9-way digital input detection function; The auxiliary circuit includes an electronic lock driving module A, an electronic lock driving module B, a DC contactor A, a DC contactor B, an insulation detection module A, an insulation detection module B, a discharge resistor A and a discharge resistor B. The input end of the electronic lock driving module A is connected to the first main control module of the control circuit, and the output end is connected to the electronic lock driving line of the device A gun, which is used to control the opening and closing of the electronic lock during the charging process of the device; the input end of the electronic lock driving module B is connected to the second main control module, which is used to control the opening and closing of the electronic lock of the B gun during the charging process; The human-computer interaction unit includes an LED display module A, an LED display module B, a touch screen and a radio frequency module. The LED display module A is used to display the status of the device A gun, and the LED display module B is used to display the status of the device B gun; The thermal management system includes two temperature measuring probes, a heat dissipation fan and a heat dissipation air duct.

2. A dual-gun DC charging pile system according to claim 1, characterized in that: The rear stage of the AC contactor is connected to the branch terminal, which separates one three-phase AC input to the AC input interface of the power module in the power unit; the AC contactor is responsible for controlling the power input of the power unit; the lightning arrester of the AC input circuit also has a normally closed switch connected to the first main control module of the control circuit, and the first main control module performs status detection and alarm output.

3. A dual-gun DC charging pile system according to claim 1, characterized in that: The power module of the power unit is a 20kw AC-DC power module, which is responsible for rectifying the three-phase AC output into DC output; the DC output interface of the power module is connected to the first output copper bus, the second output copper bus, the third output copper bus and the fourth output copper bus in the DC output circuit.

4. A dual-gun DC charging pile system according to claim 1, characterized in that: The fuse A is connected to the first output copper busbar and the inner side of the first DC contactor, and is responsible for the DC+ output circuit of the device A gun; the fuse B is connected to the fourth output copper busbar and the inner side of the second DC contactor, and is responsible for the DC+ output circuit of the device B gun.

5. A dual-gun DC charging pile system according to claim 1, characterized in that: The shunt A is connected to the first output copper bus and the third DC contactor, and is responsible for the DC-output circuit of the device A gun, wherein the shunt A is also connected to the DC power meter A by two wires, and the DC power meter A is responsible for the output measurement of the device A gun; the shunt B is connected to the second output copper bus and the fourth DC contactor, and is responsible for the DC-output circuit of the device B gun, wherein the shunt B is connected to the DC power meter B by two wires, and the DC power meter B is responsible for the output measurement of the device B gun.

6. A dual-gun DC charging pile system according to claim 1, characterized in that: The coils of the first DC contactor, the third DC contactor, the fifth DC contactor and the sixth DC contactor are connected to the first main control module of the control circuit, and the second DC contactor and the fourth DC contactor are connected to the second main control module, and their disconnection and closing are controlled by the control circuit.

7. A dual-gun DC charging pile system according to claim 1, characterized in that: The DC+ and DC- input interfaces on the insulation detection module A are respectively connected to the inner sides of the first DC contactor and the third DC contactor in the DC output circuit, and the insulation performance of the DC output busbar of the device A gun is tested before the pre-charging stage; the insulation detection module B is connected to the inner sides of the second DC contactor and the fourth DC contactor, and the insulation performance of the DC output busbar of the device B gun is tested before the pre-charging stage; the insulation detection module A and the insulation detection module B also have 1 RS485 communication, and are respectively connected to the first main control module and the second main control module in the control circuit, and the detected insulation resistance data is transmitted to the main control module, which is responsible for judgment and alarm.

8. A dual-gun DC charging pile system according to claim 1, characterized in that: The DC contactor A and the discharge resistor A form the discharge circuit of the device A gun, and the DC contactor B and the discharge resistor B form the discharge circuit of the B gun. When the power is turned off, the charge in the load circuit can be quickly discharged to ensure that the system can respond normally and quickly when it is started next time.

9. A dual-gun DC charging pile system according to claim 1, characterized in that: The two temperature measuring probes of the thermal management system are placed at the air inlet and outlet, and are connected to the first main control module in the control loop. When the temperature exceeds the reliable threshold, the first main control module controls the power module to reduce the output power or disconnect the output; the cooling fan is controlled by the first main control module, and the cooling fan will be started synchronously when charging is started, and heat is dissipated through the designed cooling air duct, thereby reducing the internal temperature of the charging pile, ensuring the normal operation of each component, and improving the safety of the charging pile.

10. A dual-gun DC charging pile system according to claim 1, characterized in that: The first input copper bar, molded case circuit breaker, second input copper bar, AC contactor, first miniature circuit breaker, lightning arrester and branch terminal of the AC input circuit are all arranged on the first mounting plate, the fuse A, fuse B, first DC contactor, second DC contactor, third DC contactor, fourth DC contactor, fifth DC contactor, sixth DC contactor, shunt A, shunt B, first output copper bar, second output copper bar, third output copper bar and fourth output copper bar of the DC output circuit are all arranged on the second mounting plate, the electronic lock drive module A and electronic lock drive module B of the auxiliary circuit are arranged on the second mounting plate, and the first input copper bar, molded case circuit breaker, second input copper bar, third input copper bar, AC contactor, first miniature circuit breaker, lightning arrester and branch terminal of the AC input circuit are all arranged on the first mounting plate, the fuse A, fuse B, first DC contactor, second DC contactor, third DC contactor, fourth DC contactor, fifth DC contactor, sixth DC contactor, shunt A, shunt B, first output copper bar, second output copper bar, third output copper bar and fourth output copper bar of the DC output circuit are all arranged on the second mounting plate, and the electronic lock drive module A and electronic lock drive module B of the auxiliary circuit are arranged on the second mounting plate. , DC contactor A, DC contactor B, insulation detection module A, insulation detection module B, discharge resistor A and discharge resistor B are all arranged on the third mounting board, the first main control module, the second main control module, the 150W switching power supply, the 50W switching power supply and the second miniature circuit breaker of the control loop are all arranged on the fourth mounting board, the LED display module A, the LED display module B, the touch screen and the radio frequency module of the human-computer interaction unit are all arranged on the fifth mounting board; the first mounting board, the second mounting board, the third mounting board and the fourth mounting board are all arranged in the box body, and the fifth mounting board is arranged on the box door.

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