Electric energy metering device, charge controller, charging pile, and leakage protection method therefor

Abstract

An electric energy metering device, a charge controller, a charging pile, and a leakage protection method therefor. The electric energy metering device comprises a metering circuit (201), an insulation detection circuit (203) and an adhesion detection circuit (202). A sampling pin (1# and 2# or 7# and 8#) of at least one side of the adhesion detection circuit is correspondingly connected to a sampling pin of another circuit that is used for performing sampling on the same position. External connection of any two connected sampling pins is achieved by means of a same interface on the electric energy metering device, so that the connected sampling pins can share a same sampling wire harness, thereby reducing the number of sampling wire harnesses, and preventing problems such as complicated wire connection and scattered and disorganized internal wiring of charging piles. In addition, circuit breakers having a leakage protection function in the prior art may also be omitted, and a leakage threshold for implementing leakage protection may be set according to the current working condition of charging piles, thus achieving a balance between prevention of unwanted tripping and electrical shock protection.

Description

An electric energy metering device, a charging controller and a charging pile and a leakage protection method thereof

[0001] The present application claims priority to the Chinese patent application No. 202410772075.5, filed on June 14, 2024, and entitled "An electric energy metering device, a charging controller and a charging pile and a leakage protection method thereof", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of charging piles, and in particular to an electric energy metering device, a charging controller and a charging pile and a leakage protection method thereof. BACKGROUND

[0003] A charging pile is a power supplement device for electric vehicles, which is similar to a fuel dispenser in a gas station, and can be fixed to the ground or a wall, installed in a public building, a residential parking lot or a charging station, and can charge various types of electric vehicles according to different voltage levels.

[0004] In order to realize the metering of the electric energy charged into an electric vehicle for facilitating charging, the internal part of a charging pile generally needs to be provided with a direct current electric energy meter and a charging controller in addition to a main circuit; the direct current electric energy meter samples the charging voltage and current on the direct current side of the main circuit at high voltage, meters the electric energy charged into the electric vehicle, and transmits it to the charging controller; the charging controller is mainly used for controlling the operation of the main circuit and charging according to the received metering information, and in addition, an internal circuit for insulation detection and switch sticking detection of the direct current side of the main circuit is usually provided, both of which realize the corresponding detection functions by high-voltage sampling of the direct current side of the main circuit, so that the charging controller can be protected in time when any detection result indicates an abnormality, thereby improving the safety of the charging pile.

[0005] SUMMARY

[0006] In view of the above problems, the present application provides an electric energy metering device, a charging controller and a charging pile and a leakage protection method thereof to reduce high-voltage sampling wiring harnesses, avoid complex wiring and scattered and disordered internal wiring of the charging pile. The specific scheme is as follows:

[0007] The first aspect of the present application provides an electric energy metering device, comprising: a metering circuit, an insulation detection circuit and a sticking detection circuit; wherein,

[0008] The metering circuit is used for sampling the voltage and current on the output side of the charging pile where the electric energy metering device is located, and performing electric energy metering according to the sampling information;

[0009] The sticking detection circuit is used for sticking detection of an output side switch, wherein the output side switch is arranged between an output side of a power conversion unit in a main circuit of the charging pile and an output side of the charging pile.

[0010] The insulation detection circuit is used for insulation detection of the output side of the charging pile.

[0011] The first side sampling pin of the sticking detection circuit is connected to a sampling pin corresponding to the same position sampled by the metering circuit; and / or, the second side sampling pin of the sticking detection circuit is connected to a sampling pin corresponding to the same position sampled by the insulation detection circuit.

[0012] Any two connected sampling pins are connected to the outside through the same interface on the electric energy metering device.

[0013] In a possible implementation, the negative sampling pin of the metering circuit is used for connecting the output side negative of the power conversion unit.

[0014] The low-potential current sampling pin of the metering circuit is used for connecting a current output end of a shunt, wherein the shunt is arranged in a positive transmission branch between the output side of the power conversion unit and the output side switch.

[0015] The high-potential current sampling pin of the metering circuit is used for connecting a current input end of the shunt.

[0016] The first side negative sampling pin of the sticking detection circuit is connected to the negative sampling pin of the metering circuit.

[0017] The first side positive sampling pin of the sticking detection circuit is connected to the low-potential current sampling pin of the metering circuit.

[0018] In a possible implementation, the positive sampling pin of the insulation detection circuit is used for connecting the output side positive of the charging pile.

[0019] The negative sampling pin of the insulation detection circuit is used for connecting the output side negative of the charging pile.

[0020] The second side positive sampling pin of the sticking detection circuit is connected to the positive sampling pin of the insulation detection circuit.

[0021] The second side negative sampling pin of the sticking detection circuit is connected to the negative sampling pin of the insulation detection circuit.

[0022] In a possible implementation, the electric energy metering device further includes a processing module configured to process the metering information of the metering circuit, the detection information of the insulation detection circuit, and the detection information of the adhesion detection circuit respectively, and report the processing results to a charging controller of the charging pile.

[0023] In a possible implementation, the electric energy metering device further includes a display screen configured to display the processing results.

[0024] The first aspect of the present application provides a charging controller, including a processor, and at least one electric energy metering device as described above or in any of the implementation forms of the first aspect; wherein,

[0025] The processor is connected with the electric energy metering device and an electric vehicle connected with the charging pile respectively; wherein, the processor is configured to control the on-off state of an input side switch and an output side switch in the charging pile, and control the operation of a main circuit in the charging pile.

[0026] In a possible implementation, a leakage protection device is arranged between the input side switch and the input side of the charging pile, or between the output side switch and the output side of the charging pile; wherein,

[0027] The leakage threshold of the leakage protection device corresponds to the current working condition of the charging pile.

[0028] The charging controller further includes a communication circuit configured to communicate with the leakage protection device, and connected with the processor.

[0029] In a possible implementation, a current sensor is arranged between the input side switch and the input side of the charging pile, or between the output side switch and the output side of the charging pile.

[0030] The charging controller further includes a leakage detection circuit connected with the current sensor and the processor respectively.

[0031] The leakage threshold of the leakage detection circuit corresponds to the current working condition of the charging pile.

[0032] The third aspect of the present application provides a charging pile, including a main circuit, a charging controller, and at least one electric energy metering device; wherein,

[0033] The main circuit includes at least one power conversion unit, the input side of the power conversion unit is connected with the input side of the charging pile through an input side switch, and the output side of the power conversion unit is connected with the corresponding output side of the charging pile through a shunt and an output side switch in sequence.

[0034] The input side of the charging pile is used for connecting a power grid, and the output side of the charging pile is used for connecting an electric vehicle;

[0035] The electric energy metering device is used for electric energy metering of the corresponding power conversion unit;

[0036] The input side switch, the output side switch and the power conversion unit are respectively controlled by the charging controller; the charging controller is connected with the electric energy metering device and the electric vehicle connected with the charging pile;

[0037] In the electric energy metering device, the charging controller or the power conversion unit, the first sampling pin of the adhesion detection circuit is connected with a sampling pin pair corresponding to the same position of the electric energy metering device of the same power conversion unit, and / or the second sampling pin of the adhesion detection circuit is connected with a sampling pin pair corresponding to the same position of the insulation detection circuit of the same power conversion unit.

[0038] In a possible implementation, the charging pile further comprises a leakage protection device;

[0039] The leakage protection device is arranged between the input side switch and the input side of the charging pile or between the output side switch and the output side of the charging pile, and is connected with the charging controller;

[0040] The leakage threshold of the leakage protection device corresponds to the current working condition of the charging pile.

[0041] In a possible implementation, the leakage protection device comprises a current sensor, a leakage detection circuit and a leakage communication module; wherein,

[0042] The current sensor is arranged between the input side switch and the input side of the charging pile or between the output side switch and the output side of the charging pile, and the output end thereof is connected with the input end of the leakage detection circuit;

[0043] The output end of the leakage detection circuit is connected with one side of the leakage communication module;

[0044] The other side of the leakage communication module is used for connecting with the charging controller.

[0045] In a possible implementation, the charging pile further comprises a current sensor;

[0046] The current sensor is arranged between the input side switch and the input side of the charging pile, or between the output side switch and the output side of the charging pile.

[0047] The input end of the current sensor is connected with a leakage detection circuit in the charging controller.

[0048] The leakage threshold of the leakage detection circuit corresponds to the current working condition of the charging pile.

[0049] In a possible implementation, when the number of the power conversion units is greater than 1:

[0050] Each of the power conversion units is connected with the input side of the charging pile through a corresponding input side switch.

[0051] Alternatively, at least two of the power conversion units share the same input side switch.

[0052] In a possible implementation, the power conversion unit includes one power module, or a plurality of power modules connected in parallel.

[0053] In a possible implementation, when the power grid is an alternating current power grid, the power module is an AC / DC conversion circuit, or the power module includes an AC / DC conversion circuit and a DC / DC conversion circuit connected in series.

[0054] Alternatively, when the power grid is a direct current power grid, the power module is a DC / DC conversion circuit.

[0055] The fourth aspect of the present application provides a leakage protection method of a charging pile, applied to the charging pile in the third aspect or any possible implementation form of the third aspect, and the leakage protection method includes:

[0056] Obtaining a leakage value of the charging pile.

[0057] If the leakage value exceeds a leakage threshold, controlling an input side switch of the charging pile to be turned off.

[0058] In a possible implementation, the leakage threshold is a sum of a leakage increment and an operating leakage current of the charging pile in a current working condition.

[0059] The operating leakage current is determined according to historical leakage data of the charging pile, and the leakage increment is determined according to a leakage current detection type and a planned monitored leakage current under a power grid connected with the charging pile.

[0060] By the above technical scheme, the electric energy metering device provided by the application comprises a metering circuit, an insulation detection circuit and a adhesion detection circuit; wherein the first side sampling pin of the adhesion detection circuit is connected to the sampling pin of the same position of the metering circuit; and / or the second side sampling pin of the adhesion detection circuit is connected to the sampling pin of the same position of the insulation detection circuit; and any two connected sampling pins are connected to the outside through the same interface on the electric energy metering device, so that the connected sampling pins can share the same sampling wire harness, thereby reducing the number of sampling wire harnesses and avoiding the problems of complex wiring and scattered and disordered internal wiring of the charging pile. BRIEF DESCRIPTION OF DRAWINGS

[0061] The above and other features, advantages, and aspects of the present disclosure will become more apparent by referring to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, like or similar reference numerals are used to refer to like or similar elements throughout the various figures. It should be understood that the drawings are diagrammatic and schematic representation of elements and features do not necessarily depict the actual scale or proportions.

[0062] FIG. 1 is a structural schematic diagram of a charging pile provided by the application;

[0063] FIG. 2 is a structural schematic diagram of a charging pile provided by the application;

[0064] FIG. 3 is a structural schematic diagram of a charging pile provided by the application;

[0065] FIG. 4 is a structural schematic diagram of a charging pile provided by the application;

[0066] FIG. 5 is a structural schematic diagram of a charging pile provided by the application;

[0067] FIG. 6 is a structural schematic diagram of a charging pile provided by the application;

[0068] FIG. 7 is a structural schematic diagram of a charging pile provided by the application;

[0069] FIG. 8 is a structural schematic diagram of a charging pile provided by the application;

[0070] FIG. 9 is a structural schematic diagram of a charging pile provided by the application;

[0071] FIG. 10 is a structural schematic diagram of a charging pile provided by the application;

[0072] FIG. 11 is a structural schematic diagram of a charging pile provided by the application;

[0073] FIG. 12 is a structural schematic diagram of a charging pile provided by the application;

[0074] FIG. 13 is a structural schematic diagram of a charging pile provided by the application;

[0075] Fig. 14 is another structural schematic diagram of the charging pile provided by the present application;

[0076] Fig. 15 is another structural schematic diagram of the charging pile provided by the present application;

[0077] Fig. 16 is another structural schematic diagram of the charging pile provided by the present application;

[0078] Fig. 17 is a flow chart of a leakage protection method of a charging pile provided by the present application. DETAILED DESCRIPTION

[0079] The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The terms used in the embodiment part of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0080] The embodiments of the present application will be described below in conjunction with the drawings, and obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application. Those skilled in the art can know that with the development of technology and the appearance of new scenes, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0081] The terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, and this is only a distinguishing way used in the description of the embodiments of the present application to describe the objects with the same attributes. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that the processes, methods, systems, products or equipment containing a series of units do not have to be limited to those units, but can include other units not clearly listed or inherent to these processes, methods, products or equipment.

[0082] Fig. 1 shows the structure of a charging pile, referring to Fig. 1, the structure for charging an electric vehicle in the main circuit of the charging pile includes input side switch 01, power conversion unit 02, shunt 03 and output side switch 04 connected in sequence; the power conversion unit 02 is also equipped with a direct current energy meter, a sticking detection circuit and an insulation detection circuit, all of which need to sample the output side of the power conversion unit 02 at high voltage, that is, each has a lead connected to the output side circuit, resulting in a large number of high-voltage sampling harnesses, such as harnesses 1# to 9# shown in Fig. 1, among which, harnesses 1#, 2# and 9# are the harnesses for the direct current energy meter to sample the output side of the power conversion unit 02, harnesses 3#, 4#, 5# and 6# are the harnesses for the sticking detection circuit to sample on both sides of the output side switch 04, and harnesses 7# and 8# are the harnesses for the insulation detection circuit to sample the output side of the charging pile; in this case, not only is the wiring complex, but also the wiring inside the charging pile is scattered and messy.

[0083] Based on this, the embodiment of the present application provides an electric energy metering device to reduce high-voltage sampling harnesses, avoid complex wiring and scattered and messy wiring inside the charging pile. The specific scheme is as follows:

[0084] Referring to Fig. 2, the electric energy metering device 20 includes metering circuit 201, insulation detection circuit 203 and sticking detection circuit 202; wherein:

[0085] The metering circuit 201 is equivalent to the direct current energy meter shown in Fig. 1, which is used to sample the voltage and current of the output side of the charging pile where the electric energy metering device 20 is located, and perform electric energy metering according to the sampling information, so as to record the charging cost for the charging controller 30 in the charging pile.

[0086] The sticking detection circuit 202 is used to detect the sticking of the output side switch 104, that is, to detect whether the output side switch 104 is stuck. The output side switch 104 is located between the output side of the power conversion unit 102 in the main circuit of the charging pile and the output side of the charging pile.

[0087] The insulation detection circuit 203 is used to detect the insulation of the output side of the charging pile; in actual application, the insulation detection circuit 203 can monitor whether the resistance (i.e. ground insulation impedance) of the positive and negative poles DC+ and DC- to the PE line is within a safe range by taking one line from each branch connected to the positive and negative poles DC+ and DC- of the output side of the charging pile.

[0088] In addition, the metering circuit 201, the insulation detection circuit 203 and the adhesion detection circuit 202 are not only integrated in the electric energy metering device 20, but also: the first side sampling pin of the adhesion detection circuit 202 is connected to the sampling pin of the metering circuit 201 corresponding to the same position; and / or, the second side sampling pin of the adhesion detection circuit 202 is connected to the sampling pin of the insulation detection circuit 203 corresponding to the same position. That is, at least one side of the adhesion detection circuit 202 is connected to the sampling pin of another circuit corresponding to the same position.

[0089] It should be noted that, since the influence of cable impedance on high-voltage sampling results can be ignored, sampling points with the same or substantially same electric potential can be regarded as the same position, for example, different sampling points on the same cable or different cables connected in parallel, and the electric potential difference of which is less than a certain threshold, can be regarded as the same position.

[0090] In addition, any two connected sampling pins are connected to the outside through the same interface on the electric energy metering device 20, so that the connected sampling pins can share the same high-voltage sampling harness.

[0091] As shown in FIG. 2, the two sides of the adhesion detection circuit 202 are connected to the sampling pins of another circuit corresponding to the same position, in which case, the adhesion detection circuit 202 and the metering circuit 201 can share the harnesses 1# and 2#, and the adhesion detection circuit 202 and the insulation detection circuit 203 can share the harnesses 7# and 8#. Compared with the case shown in FIG. 1, the scheme shown in FIG. 2 can save four high-voltage sampling harnesses, i.e., the harnesses 3#, 4#, 5# and 6# shown in FIG. 1, and the number of high-voltage sampling harnesses is reduced by nearly 50%. In actual application, only one side of the adhesion detection circuit 202 can be connected to the sampling pin of another circuit corresponding to the same position, for example, the adhesion detection circuit 202 shares the harnesses 1# and 2# with the metering circuit 201, while the adhesion detection circuit 202 still performs high-voltage sampling through the harnesses 5# and 6# shown in FIG. 1, and the insulation detection circuit 203 still performs high-voltage sampling through the harnesses 7# and 8# shown in FIG. 1, in which case, the harnesses 3# and 4# shown in FIG. 1 can be saved; or, the adhesion detection circuit 202 shares the harnesses 7# and 8# with the insulation detection circuit 203, while the adhesion detection circuit 202 still performs high-voltage sampling through the harnesses 3# and 4# shown in FIG. 1, and the metering circuit 201 still performs high-voltage sampling through the harnesses 1#, 2# and 9# shown in FIG. 1, in which case, the harnesses 5# and 6# shown in FIG. 1 can be saved.

[0092] The electric energy metering device 20 provided by the embodiment, through the above principle, enables the connected sampling pins to share the same sampling wire harness, thereby reducing the number of sampling wire harnesses and avoiding the problems of complex wiring and scattered and disordered internal wiring of the charging pile.

[0093] In addition, the electric energy metering device 20 combines the functions of electric energy metering, insulation detection and adhesion detection, thereby reducing the high-voltage sampling wire harness, and compared with the prior art in which the high-voltage sampling of each circuit needs to be isolated respectively, the embodiment can also process the high-voltage sampling centrally and share the isolation circuit, thereby reducing the isolation cost of the high-voltage sampling.

[0094] On the basis of the above embodiment, the embodiment specifically describes the connection relationship of the sampling pins in the electric energy metering device 20.

[0095] Firstly, in the charging pile, as shown in FIG. 2, the structure for charging one electric vehicle includes the input side switch 101, the power conversion unit 102, the shunt 103 and the output side switch 104 connected in sequence; the shunt 103 can be specifically arranged in the positive transmission branch between the output side of the power conversion unit 102 and the output side switch 104, and the function of the shunt 103 is to convert the large current signal on the output side line of the charging pile into a small voltage signal, so as to facilitate the signal processing of the charging controller 30. The negative sampling pin of the metering circuit 201 is connected to the output side negative of the power conversion unit 102 through the wire harness 1#; the positive sampling pin of the metering circuit 201 includes a low-potential current sampling pin and a high-potential current sampling pin, wherein the low-potential current sampling pin is connected to the current output end of the shunt 103 through the wire harness 2#, and the high-potential current sampling pin is connected to the current input end of the shunt 103 through the wire harness 9#; the positive sampling pin of the insulation detection circuit 203 is connected to the output side positive of the charging pile through the wire harness 8#; and the negative sampling pin of the insulation detection circuit 203 is connected to the output side negative of the charging pile through the wire harness 7#.

[0096] On the basis of the structure:

[0097] If the first side sampling pin of the adhesion detection circuit 202 and the sampling pin of the metering circuit 201 for sampling the same position are connected correspondingly, then specifically: the first side negative sampling pin of the adhesion detection circuit 202 is connected to the negative sampling pin of the metering circuit 201, both of which are used for connecting the output side negative of the power conversion unit 102, and the connection is specifically realized through the wire harness 1# shown in FIG. 2; and the first side positive sampling pin of the adhesion detection circuit 202 is connected to the low-potential current sampling pin of the metering circuit 201, both of which are used for connecting the current output end of the shunt 103, and the connection is specifically realized through the wire harness 2# shown in FIG. 2.

[0098] If the second side sampling pin of the adhesion detection circuit 202 is connected to the sampling pin of the insulation detection circuit 203 for sampling the same position, there are the following specific connections: the second side positive sampling pin of the adhesion detection circuit 202 is connected to the positive sampling pin of the insulation detection circuit 203, both of which are used to connect the output side positive of the charging pile, and the connection is specifically realized through the wire harness 8# shown in FIG. 2; the second side negative sampling pin of the adhesion detection circuit 202 is connected to the negative sampling pin of the insulation detection circuit 203, both of which are used to connect the output side negative of the charging pile, and the connection is specifically realized through the wire harness 7# shown in FIG. 2.

[0099] Taking the case shown in FIG. 2 as an example, the adhesion detection circuit 202 is connected to another circuit on both sides for corresponding connection of the sampling pins and sharing of the sampling wire harnesses. For the electric energy metering device 20, the voltage on the output side of the charging pile can be sampled through the wire harnesses 1# and 2#; the current signal can be obtained by taking the voltages on both sides of the shunt 103 through the wire harnesses 9# and 2#, so that the current detection can be realized; the negative voltage on both sides of the output side switch 104 can be sampled through the wire harnesses 1# and 7#, so that the adhesion detection circuit 202 can monitor the contact state of the output side switch 104 on the negative branch to determine whether the contact is adhered; the positive voltage on both sides of the output side switch 104 can be sampled through the wire harnesses 2# and 8#, so that the adhesion detection circuit 202 can monitor the contact state of the output side switch 104 on the positive branch to determine whether the contact is adhered; in addition, the wire harnesses 7# and 8# can meet the needs of the insulation detection circuit 203 to realize the insulation detection function.

[0100] In addition, the metering circuit 201, the insulation detection circuit 203 and the adhesion detection circuit 202 can be connected to the charging controller 30 through corresponding signal lines respectively to report corresponding information to the charging controller 30. Alternatively, referring to FIG. 3, in actual application, the electric energy metering device 20 can further include a processing module 204, so as to process each information respectively when the metering information of the metering circuit 201, the detection information of the insulation detection circuit 203 and the detection information of the adhesion detection circuit 202 are acquired, and the processing result includes electric energy data, relay contact state and insulation detection result. Then, the processing result is reported to the charging controller 30. At this time, the electric energy metering device 20 can be connected to the charging controller 30 through the processing module 204, and the electric energy data, the relay contact state and the insulation detection result can be reported to the charging controller 30 in the form of a message. In actual application, the electric energy data is the electric energy charged into the electric vehicle currently being charged, and the charging controller 30 can charge according to the electric energy data. The relay contact state includes the on-off state of the two contacts on the positive and negative branches of the output side switch 104 on the charging pile output side. If the charging controller 30 learns that the corresponding contact is not disconnected through the relay contact state in the case that any contact should be disconnected, it can be determined that the contact is adhered. The insulation detection result is the ground insulation impedance of the charging pile output side, and the charging controller 30 can compare and judge the ground insulation impedance with the preset impedance threshold. If it is found that the ground insulation impedance is less than the preset impedance threshold, it can be determined that the charging pile output side has insulation failure, and the input side switch 101 and the output side switch 104 need to be controlled to be disconnected.

[0101] Further, the electric energy metering device 20 can further include a display screen for displaying the above processing result, so that the processing result of the metering circuit 201, the insulation detection circuit 203 and the adhesion detection circuit 202 can share the display.

[0102] The electric energy metering device 20 provided by the embodiment combines the functions of electric energy metering, insulation detection and adhesion detection, reduces the high-voltage sampling harness, shares the isolation circuit for high-voltage sampling, can also share the display, and reduces the comprehensive cost.

[0103] It should be noted that in the prior art shown in Figure 1, in order to achieve leakage protection for the charging pile, the input side switch 01 needs to use a circuit breaker with leakage protection function, and such circuit breakers have a fixed leakage current protection threshold; if a circuit breaker with a small leakage current protection threshold, such as 30mA, is selected in the charging pile, false tripping caused by leakage of the power conversion unit 02 is likely to occur; in order to prevent false tripping, a circuit breaker with a large rated leakage current, such as a circuit breaker with a 100mA leakage current protection threshold, needs to be selected, which greatly reduces the safety of leakage protection, cannot timely detect leakage accidents and disconnect the device from the power grid, and cannot play a good electric shock protection role. Therefore, the prior art cannot balance false tripping and electric shock protection for large power charging piles with power variation.

[0104] Therefore, in the charging pile, as shown in Figures 4 or 5, instead of using a circuit breaker with leakage protection function, a common circuit breaker is used to implement the input side switch 101, and a current sensor 111 and a leakage detection circuit are additionally provided; there are two implementation forms:

[0105] (1) An additional leakage protection device 100 is provided; the leakage protection device 100 can be arranged between the input side switch 101 and the input side of the charging pile (as shown in Figures 4 and 5), or it can also be arranged between the output side switch 104 and the output side of the charging pile, which is determined according to the specific application environment and is within the protection scope of the present application.

[0106] Referring to Figure 4 (exhibiting based on the structure shown in Figure 3), the leakage protection device 100 can include a current sensor 111, a leakage detection circuit, and a leakage communication module; the current sensor 111 can be a mutual inductor, and the leakage detection circuit can be a leakage signal processing chip. Moreover, the leakage protection device 100 can detect alternating current leakage and direct current leakage; specifically, for the case that the input side of the charging pile is connected to an alternating current power grid, if the current sensor 111 is arranged at the input side of the charging pile as shown in Figure 4, alternating current leakage can be detected, and leakage of the input side switch 101 and the circuit behind it can be monitored by the leakage protection device 100; if the current sensor 111 is arranged at the output side of the charging pile, direct current leakage can be detected; a dedicated sensor can also be arranged at the input side of the charging pile, and alternating current and direct current can be detected and identified together; three leakage detection methods can be selected according to the specific application environment, which is within the protection scope of the present application.

[0107] In the electric leakage protection device 100, the current sensor 111 detects the current at the corresponding position and outputs the detection information to the electric leakage detection circuit, which determines the electric leakage current and transmits the electric leakage data to the charging controller 30 when the electric leakage current is greater than the electric leakage threshold.

[0108] In an example, the electric leakage detection circuit can set the required electric leakage protection threshold according to the actual situation. For example, the working electric leakage current corresponding to the current working condition of the charging pile can be determined according to the historical electric leakage data of the charging pile, and the electric leakage threshold in the current working condition is set as the threshold for electric leakage protection. In practical applications, the electric leakage threshold can be set to be greater than the working electric leakage current in the same working condition by one electric leakage increment, thereby providing a certain margin to avoid false tripping.

[0109] In the normal working process of the charging pile, the charging controller 30 and the electric leakage protection device 100 maintain communication to ensure normal communication. If electric leakage occurs, the electric leakage protection device 100 transmits the electric leakage data to the charging controller 30, and the charging controller 30 controls the input side switch 101 to be disconnected to cut off the circuit.

[0110] (2) In practical applications, the electric leakage detection circuit described above can also be set in the charging controller 30, as shown in FIG. 5 (based on the structure shown in FIG. 3). Correspondingly, the current sensor 111 is arranged between the input side switch 101 and the input side of the charging pile (as shown in FIG. 5) or between the output side switch 104 and the output side of the charging pile, for detecting the current at the corresponding position. The electric leakage detection circuit in the charging controller 30 is connected with the current sensor 111 and the processor 301 in the charging controller 30, can receive the detection information output by the current sensor 111, determine the electric leakage current, and transmit the electric leakage data directly to the processor 301 when the electric leakage current is greater than the electric leakage threshold. The setting principle of the electric leakage threshold is the same as described above, and will not be repeated here.

[0111] The present embodiment not only reduces the cost of high-voltage sampling harness and isolation, but also cancels the circuit breaker with electric leakage protection function in the existing scheme, so that the input side switch 101 can directly use a circuit breaker without electric leakage protection function, and the electric leakage detection function is realized by adding an electric leakage protection device or by adding a current sensor 111 and an electric leakage detection circuit. Moreover, the electric leakage threshold corresponds to the current working condition of the charging pile, i.e., it can change according to the current working condition of the charging pile, and it can also adapt to the power change of a high-power charging pile with power change, so that the electric leakage current monitoring is more refined, and the electric shock accident can be responded in time, thereby balancing false tripping and electric shock protection.

[0112] Another embodiment of the present application also provides a charging controller 30, as shown in FIG. 6 or FIG. 7, which specifically comprises: a processor 301, and at least one electric energy metering device 20 according to any one of the above embodiments; wherein the processor 301 is configured to control the on-off state of the input side switch 101 and the output side switch 104 in the charging pile, control the main circuit operation in the charging pile, and connect with the electric vehicle connected with the electric energy metering device 20 and the charging pile respectively. The processor 301 can be a MCU (Microcontroller Unit), but is not limited thereto, and devices capable of achieving the above functions in the prior art are also within the protection scope of the present application.

[0113] The structure and working principle of the electric energy metering device 20 can be found in the above embodiments, which will not be repeated here. In this embodiment, the electric energy metering device 20 is integrated into the charging controller 30, which can also reduce the high-voltage sampling harness, so that the metering circuit 201, the insulation detection circuit 203 and the adhesion detection circuit 202 in the above embodiments can share the high-voltage sampling isolation circuit, and the processing results of the three can also be shared.

[0114] Referring to FIG. 6, when the charging pile includes the electric leakage protection device 100 in the above embodiments, the charging controller 30 further comprises a communication circuit 302 configured to connect with the electric leakage protection device 100 and connect with the processor 301. That is, the current sensor 111 in the electric leakage protection device 100 detects the current at the corresponding position and outputs the detection information to the electric leakage detection circuit, which determines the electric leakage current and transmits the electric leakage data to the processor 301 through the electric leakage communication module and the communication circuit 302 when the electric leakage current is greater than the electric leakage threshold.

[0115] During the normal operation of the charging pile, the processor 301 keeps communicating with the electric leakage protection device 100 to ensure normal communication; if electric leakage occurs, the electric leakage protection device 100 sends the electric leakage data to the processor 301, and the processor 301 controls the input side switch 101 to be disconnected to cut off the circuit.

[0116] In actual application, when the charging controller 30 communicates with other devices, such as the communication between the communication circuit 302 and the electric leakage protection device 100, and the communication between the processor 301 and the electric vehicle and the processing module 204 in the electric energy metering device 20, the communication can be connected through the corresponding communication line, or the communication between them can be realized through the wireless communication mode, which depends on the specific application environment and is within the protection scope of the present application; the communication connection in each figure is shown by a dashed line.

[0117] As described in the above embodiments, in actual applications, the above leakage detection circuit can also be arranged in the charging controller 30, as shown in FIG. 7; the arrangement position of the current sensor 111 and the setting principle of the leakage threshold can be referred to the above embodiments, which will not be described herein.

[0118] The charging controller 30 provided by the embodiment can further cancel the circuit breaker with leakage protection function in the existing scheme, so that the input-side switch 101 can directly adopt the circuit breaker without leakage protection function, and the leakage detection function can be realized by adding the leakage protection device or the current sensor 111 and the leakage detection circuit; moreover, the leakage threshold corresponds to the current working condition of the charging pile, that is, the leakage threshold can change according to the current working condition of the charging pile, and can also adapt to the power change of the high-power charging pile with power change, so that the leakage current monitoring is more refined, and the electric shock accident can be responded in time, thereby considering the false tripping and electric shock protection.

[0119] Another embodiment of the present application further provides a charging pile, as shown in FIG. 8, comprising a main circuit, a charging controller 30, and at least one electric energy metering device 20; wherein:

[0120] As shown in FIGS. 2 to 5, the main circuit comprises at least one (one is taken as an example for description in FIGS. 2 to 5) power conversion unit 102, the input side of the power conversion unit 102 is connected to the input side of the charging pile through the input-side switch 101, and the output side of the power conversion unit 102 is connected to the corresponding output side of the charging pile through the shunt 103 and the output-side switch 104 in sequence, and the shunt 103 can be arranged in the positive transmission branch between the output side of the power conversion unit 102 and the output-side switch 104.

[0121] The input side of the charging pile is used for connecting the power grid, and the output side of the charging pile is used for connecting the electric vehicle.

[0122] In actual applications, the input side of the charging pile can be connected to the alternating current power grid or the direct current power grid, which is not limited herein. In addition, the main circuit can comprise multiple branches, so as to connect multiple electric vehicles through the output sides of the charging pile respectively, and the input-side switch 101, the power conversion unit 102, the shunt 103 and the output-side switch 104 connected in sequence can be arranged in each branch respectively.

[0123] It should be noted that the description of the input and output sides of the charging pile and each power conversion unit 102 in the present application is based on the operation mode of taking power from the power grid and charging the electric vehicle; in actual application, the charging pile can also operate in other modes, such as in V2V (Vehicle to Vehicle, vehicle-to-vehicle interaction) or V2G (Vehicle to Grid, vehicle-to-grid interaction) application scenarios, and the electric energy can also flow from the input side of the charging pile or any power conversion unit 102 to the input side; the naming of the above input and output sides is only to distinguish the different sides of the same device, and does not limit the flow direction of electric energy.

[0124] In addition, the electric energy metering device 20 is used for electric energy metering for the corresponding power conversion unit 102; in any branch, the input side switch 101, the output side switch 104 and the power conversion unit 102 are respectively controlled by the charging controller 30; and the charging controller 30 is connected with the electric energy metering device 20 and the electric vehicle connected with the charging pile. For the above basic structure of the charging pile and its working principle, please refer to the prior art, and no more description is given here.

[0125] The difference between the present embodiment and the prior art is any of the following:

[0126] (1) The electric energy metering device 20 is the electric energy metering device 20 as described in any of the above embodiments (as shown in Figures 2 to 5).

[0127] (2) The charging controller 30 is the charging controller 30 as described in any of the above embodiments (as shown in Figure 6 or Figure 7). That is, the electric energy metering device 20 can also be integrated inside the charging controller 30, and Figure 8 only shows an example of separate arrangement of the two, which is not limited to this in actual application.

[0128] (3) Referring to Figure 9, although the electric energy metering device 20 is a direct current electric energy meter in the prior art, the charging controller 30 is also the same as in the prior art, and the power conversion unit 102 in any branch is provided with an insulation detection circuit 203 and a sticking detection circuit 202, but in any branch, the first side sampling pin of the sticking detection circuit 202 and the sampling pin of the electric energy metering device 20 corresponding to the same position are connected, and / or the second side sampling pin of the sticking detection circuit 202 and the sampling pin of the insulation detection circuit 203 corresponding to the same position are connected. In Figure 9, both sides of the sticking detection circuit 202 are connected to the corresponding sampling pins of other circuits as an example.

[0129] The high-voltage sampling scheme in this embodiment can adopt any of the above cases; that is, whether the insulation detection circuit 203 and the adhesion detection circuit 202 of each branch are integrated into the electric energy metering device 20 of the branch or not, as long as the sampling pins of different circuits are connected to share the high-voltage sampling harness and thus save the high-voltage sampling harness, it is within the protection scope of the present application. The principle of saving the high-voltage sampling harness by connecting the sampling pins of different circuits can be referred to the above embodiments, which will not be repeated here. It should be noted that for the third case, the insulation detection circuit 203 and the adhesion detection circuit 202 can also be arranged at other positions, such as both or any of them can be independent of the charging controller 30; it can be determined according to the specific application environment, which is within the protection scope of the present application.

[0130] In actual application, the input-side switch 101 can be a circuit breaker, the output-side switch 104 can be a contactor, a relay, etc.; the power conversion unit 102 can be set to include only one power module (as shown in FIGS. 2-9) or can include multiple power modules connected in parallel (FIGS. 10 or 11 take two power modules connected in parallel as an example for illustration); and the specific structure of the power module can be selected according to the type of the power grid connected to the input side of the charging pile, for example, when the power grid is an alternating current power grid, the power module is an AC / DC conversion circuit (as shown in FIGS. 2-10), or the power module includes an AC / DC conversion circuit and a DC / DC conversion circuit connected in series (as shown in FIG. 12); and when the power grid is a direct current power grid, the power module is a DC / DC conversion circuit (as shown in FIG. 11).

[0131] In addition, when there are multiple branches connecting electric vehicles in the charging pile, that is, the number of power conversion units 102 is greater than 1, each power conversion unit 102 can share the same input-side switch 101 to connect the input side of the charging pile (as shown in FIGS. 13 or 14), or can respectively use a corresponding input-side switch 101 to connect the input side of the charging pile (as shown in FIG. 15), or any two power conversion units 102 can share the same input-side switch 101 (as shown in FIG. 16). In actual application, the structure shown in FIG. 16 can be applied to the direct current power grid V2V charging scene; and the structure shown in FIG. 14 can be applied to the alternating current power grid V2V charging scene.

[0132] It is worth mentioning that when there are multiple branches connecting electric vehicles in the charging pile, the structures of the power conversion units 102 in each branch do not need to be the same, such as shown in FIGS. 13-16; specifically, the number of parallel power modules in different power conversion units 102 can be different (as shown in FIGS. 13, 15, and 16), the topologies adopted by the power modules can also be different, and even one power conversion unit 102 can be provided with part of the circuit in another power conversion unit 102 (as shown in FIG. 14); it is up to the specific application environment, which is within the protection scope of the present application.

[0133] Furthermore, when there are multiple branches connecting electric vehicles in the charging pile, the corresponding electric energy metering devices 20 in each branch can be integrated in the charging controller 30, or a part of them can be integrated in the charging controller 30 and the other part can be independent of the charging controller 30 (as shown in FIGS. 13, 15, and 16), or they can all be independent of the charging controller 30 (as shown in FIG. 14), which is not limited here.

[0134] On the basis of the above-mentioned embodiments, in order to realize leakage detection and protection, the charging pile provided in the present embodiment can further comprise a leakage protection device 100 (as shown in FIGS. 4, 6, 9, 10, 11, 13, 15, and 16); the leakage protection device 100 can be arranged between the input side switch 101 and the input side of the charging pile (as shown in the figures), or it can also be arranged between the output side switch 104 and the output side of the charging pile (not shown), which is within the protection scope of the present application; and the leakage protection device 100 is connected with the charging controller 30.

[0135] As described in the above-mentioned embodiments, the leakage protection device 100 can specifically comprise a current sensor 111, a leakage detection circuit, and a leakage communication module; wherein the current sensor 111 is arranged between the input side switch 101 and the input side of the charging pile, or between the output side switch 104 and the output side of the charging pile, and its output end is connected with the input end of the leakage detection circuit; the output end of the leakage detection circuit is connected with one side of the leakage communication module; and the other side of the leakage communication module is used for connecting with the charging controller 30.

[0136] Alternatively, the charging pile can further comprise a current sensor 111 (as shown in FIGS. 5, 7, 12, and 14); the current sensor 111 can be arranged between the input side switch 101 and the input side of the charging pile (as shown in the figures), or it can also be arranged between the output side switch 104 and the output side of the charging pile (not shown), which is within the protection scope of the present application; the input end of the current sensor 111 is connected with the leakage detection circuit in the charging controller 30.

[0137] Similarly, as described in the above embodiments, the leakage threshold of the leakage protection device 100, or the leakage threshold of the leakage detection circuit, corresponds to the current working condition of the charging pile; for example, both leakage thresholds can be set to the sum of the leakage increment and the working leakage current of the charging pile in the current working condition; and the working leakage current is determined according to the historical leakage data of the charging pile.

[0138] The leakage detection and protection principles in both cases can be referred to the above embodiments, which will not be described here.

[0139] The charging pile provided in the embodiment can reduce the high-voltage sampling harness, and can also cancel the existing scheme of the circuit breaker with leakage protection function, so that the input side switch 101 can directly use the circuit breaker without leakage protection function, and the leakage detection function can be realized by adding the leakage protection device or adding the current sensor 111 and the leakage detection circuit; and the leakage threshold can change according to the current working condition of the charging pile, and can also adapt to the power change of the high-power charging pile with power change, so that the leakage current monitoring is more refined, and the electric shock accident can be responded in time, and the false tripping and electric shock protection are considered.

[0140] Another embodiment of the present application also provides a leakage protection method of a charging pile, which is applied to the charging pile in any of the above embodiments, and the leakage protection method is shown in FIG. 17, which includes:

[0141] S101, obtaining a leakage value of the charging pile.

[0142] Specifically, the leakage detection circuit in the above embodiments determines the leakage current size according to the detection information output by the current sensor 111 as the leakage value.

[0143] If the leakage detection circuit detects that the leakage value exceeds the leakage threshold, the charging controller can be notified through communication, so that it can perform S102.

[0144] S102, controlling the input side switch of the charging pile to be turned off.

[0145] As described in the above embodiments, the current sensor 111 and the leakage detection circuit are arranged in the charging pile, whether they are integrated in the leakage protection device or the leakage detection circuit is arranged in the charging controller, as long as the leakage detection circuit detects that the leakage value exceeds the leakage threshold, it can be determined that there is a leakage, and then the processor of the charging controller is notified, so that the processor can control the input side switch to be turned off.

[0146] In actual application, after the processor knows that leakage occurs, the output side switch can also be controlled to be turned off; specifically, the input side switch and the output side switch of the branch related to the position where leakage occurs can be controlled to be turned off, or the input side switch and the output side switch of each branch in the charging pile can be controlled to be turned off; this depends on the specific application environment and is within the protection scope of the present application.

[0147] The leakage threshold value can be set as the sum of the leakage increment and the working leakage current of the charging pile under the current working condition; the working leakage current is determined according to historical leakage data of the charging pile, and the leakage increment is determined according to the leakage current detection type under the power grid connected to the charging pile and the planned monitored leakage current.

[0148] In actual application, the generation process of the leakage threshold value can be as follows:

[0149] According to the leakage current detection type under the power grid connected to the charging pile and the planned monitored leakage current, the leakage increment is set.

[0150] It can be understood that the power grid connected to the charging pile can be an alternating current power grid or a direct current power grid; when different power grids are connected, the leakage current detection position is different, and the leakage increment ΔI is also different. After the leakage current detection position of the charging pile is set, it can be determined whether to detect alternating current leakage, direct current leakage or alternating and direct current leakage together to set the leakage increment ΔI.

[0151] The leakage increment ΔI, that is, the certain margin provided to avoid false tripping in the above-mentioned embodiments, can be within 15 to 30 mA, for example, 15 mA. In actual application, the leakage increment ΔI can also be modified according to the input planned monitored leakage current, wherein the planned monitored leakage current can be determined according to the actual situation of different power of the charging pile, etc., which is not limited here and can be determined according to the specific application environment.

[0152] According to the historical leakage data of the charging pile, the working leakage current corresponding to the current working condition is determined.

[0153] It can be understood that the charging pile can have multiple working conditions, such as power-on, stable operation, end of operation, standby, etc.; and when in stable operation, the charging pile can also be divided into multiple different power segments, for example, different powers can be realized by controlling the number of input parallel power modules.

[0154] Therefore, the historical leakage data can include leakage data under various working conditions described above; in actual application, for each working condition, the average value of all leakage data since the first operation of the self-charging pile under the working condition can be calculated respectively, and taken as the leakage data of the corresponding working condition; various working conditions and their corresponding leakage data are made into a leakage characteristic table, so that when the working leakage current Iw corresponding to the current working condition is determined, the leakage data corresponding to the current working condition is determined as the working leakage current Iw according to the current working condition.

[0155] In actual application, the leakage characteristic table can be stored in the charging pile in advance, and the leakage characteristic table can be updated in real time or according to a certain period, so as to ensure that the working leakage current Iw is closer to the actual situation of the charging pile.

[0156] That is, under different working conditions, such as power-on working condition and stable running working condition with output power of 60kW, 90kW, 120kW, 240kW, etc., the working leakage current Iw is different.

[0157] The sum of the working leakage current and the leakage increment is taken as the leakage threshold.

[0158] That is, the leakage threshold I △ is calculated as follows: I △ = Iw+△I.

[0159] It can be understood that since the working leakage current Iw changes according to the current working condition of the charging pile, the leakage threshold I △ changes according to the current working condition of the charging pile. In actual application, the working state and / or working time of the charging pile can be monitored in real time to determine its working condition, and then the corresponding leakage threshold I △ is determined in real time; then the leakage detection circuit reports the case that the current leakage value exceeds the corresponding leakage threshold I △ to the charging controller, so that the charging controller issues an instruction to cut off the corresponding loop.

[0160] The leakage threshold I △ increases a leakage increment△I based on the working leakage current Iw, so that only when the leakage value exceeds the working leakage current Iw by a leakage increment△I, it is determined that there is leakage and the loop needs to be cut off under the current working condition.

[0161] For example, when the charging pile is powered on, the leakage current is large, although it exceeds the working leakage current Iw under the current working condition, but the leakage detection circuit can increase a suitable leakage increment△I to obtain the corresponding leakage threshold I △, to filter out the larger leakage current when the charging pile starts without reporting the leakage fault, eliminate self interference, prevent misoperation, and only focus on whether it further exceeds the leakage increment AI above the working leakage current Iw. In the stable operation condition, the leakage threshold value I can also be adjusted in real time according to the power of the charging pile △ .

[0162] In different working conditions, the leakage threshold value I is replaced in this embodiment △ , the leakage protection strategy is adjusted in real time, which can ensure accurate protection under various working conditions, reduce misoperation, and make the equipment disconnect from the power grid more timely to prevent electric shock.

[0163] The same and similar parts among the various embodiments in the specification can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, it is described more simply, and the relevant parts can refer to the part of the method embodiment. The system and system embodiment described above are only illustrative, and the units described as separate components can be or can not be physically separated, and the components displayed as units can be or can not be physical units, that is, they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0164] The skilled person can further realize that the units and algorithm steps of each example described in combination with the disclosed embodiments herein can be realized by electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in the above description. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical scheme. Skilled persons can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0165] The above description of the disclosed embodiments, the features described in each embodiment in the specification can be replaced or combined with each other, so that those skilled in the art can implement or use the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electrical energy metering device, characterized by The electric energy metering device comprises: a metering circuit, an insulation detection circuit and a sticking detection circuit; wherein, the metering circuit is configured to sample the voltage and current on the output side of the charging pile where the electric energy metering device is located, and perform electric energy metering according to the sampling information; the sticking detection circuit is configured to perform sticking detection on an output side switch, wherein the output side switch is arranged between the output side of a power conversion unit in a main circuit of the charging pile and the output side of the charging pile; the insulation detection circuit is configured to perform insulation detection on the output side of the charging pile; a first side sampling pin of the sticking detection circuit is connected to a sampling pin of the metering circuit corresponding to the same position; and / or a second side sampling pin of the sticking detection circuit is connected to a sampling pin of the insulation detection circuit corresponding to the same position; any two connected sampling pins are connected to the outside through the same interface on the electric energy metering device.

2. The electrical energy metering device of claim 1, wherein, a negative sampling pin of the metering circuit is configured to be connected to the output side negative pole of the power conversion unit; a low potential current sampling pin of the metering circuit is configured to be connected to the current output end of a shunt, wherein the shunt is arranged in a positive pole transmission branch between the output side of the power conversion unit and the output side switch; a high potential current sampling pin of the metering circuit is configured to be connected to the current input end of the shunt; a first side negative sampling pin of the sticking detection circuit is connected to the negative sampling pin of the metering circuit; a first side positive sampling pin of the sticking detection circuit is connected to the low potential current sampling pin of the metering circuit.

3. The electrical energy metering device of claim 1, wherein, a positive sampling pin of the insulation detection circuit is configured to be connected to the output side positive pole of the charging pile; a negative sampling pin of the insulation detection circuit is configured to be connected to the output side negative pole of the charging pile; a second side positive sampling pin of the sticking detection circuit is connected to the positive sampling pin of the insulation detection circuit; a second side negative sampling pin of the sticking detection circuit is connected to the negative sampling pin of the insulation detection circuit. Further comprising:

4. The electrical energy metering device according to any one of claims 1 to 3, characterized in that a processing module configured to process each of the metering information of the metering circuit, the detection information of the insulation detection circuit and the detection information of the sticking detection circuit, and report the processing result to a charging controller of the charging pile. Further comprising:

5. The electrical energy metering device of claim 4, wherein, a display screen configured to display the processing result. Further comprising:

6. A charge controller characterized by comprising: a processor, and at least one electric energy metering device according to any one of claims 1 to 5; wherein, the processor is connected to the electric energy metering device, the charging pile and the electric vehicle connected to the charging pile; wherein, the processor is configured to control the on-off state of an input side switch and an output side switch in the charging pile, and control the operation of a main circuit in the charging pile. A leakage protection device is arranged between the input side switch and the input side of the charging pile, or between the output side switch and the output side of the charging pile; wherein, the leakage threshold of the leakage protection device corresponds to the current working condition of the charging pile.

7. The charge controller of claim 6, wherein, ​ The charging controller further comprises a communication circuit for realizing communication with the electric leakage protection device and being connected with the processor.

8. The charge controller of claim 6, wherein, A current sensor is arranged between the input side switch and the input side of the charging pile, or between the output side switch and the output side of the charging pile; The charging controller further comprises an electric leakage detection circuit connected with the current sensor and the processor respectively; The electric leakage threshold of the electric leakage detection circuit corresponds to the current working condition of the charging pile.

9. A charging station, characterized in that It comprises: a main circuit, a charging controller, and at least one electric energy metering device; wherein, The main circuit comprises at least one power conversion unit, the input side of the power conversion unit is connected with the input side of the charging pile through an input side switch, and the output side of the power conversion unit is connected with the corresponding output side of the charging pile through a shunt and an output side switch in sequence; The input side of the charging pile is used for connecting a power grid, and the output side of the charging pile is used for connecting an electric vehicle; The electric energy metering device is used for electric energy metering for the corresponding power conversion unit; The input side switch, the output side switch and the power conversion unit are respectively controlled by the charging controller; the charging controller is connected with the electric energy metering device and the electric vehicle connected with the charging pile; Wherein, the electric energy metering device is as claimed in any one of claims 1 to 5; or, the charging controller is as claimed in any one of claims 6 to 8; or, the power conversion unit is equipped with an insulation detection circuit and a sticking detection circuit, the first side sampling pin of the sticking detection circuit is connected with the sampling pin of the electric energy metering device of the same power conversion unit corresponding to the same position, and / or the second side sampling pin of the sticking detection circuit is connected with the sampling pin of the insulation detection circuit of the same power conversion unit corresponding to the same position.

10. The charging station of claim 9, wherein, It further comprises: an electric leakage protection device; The electric leakage protection device is arranged between the input side switch and the input side of the charging pile, or between the output side switch and the output side of the charging pile, and is connected with the charging controller; The electric leakage threshold of the electric leakage protection device corresponds to the current working condition of the charging pile.

11. The charging station of claim 10, wherein, The electric leakage protection device comprises a current sensor, an electric leakage detection circuit and an electric leakage communication module; wherein, The current sensor is arranged between the input side switch and the input side of the charging pile, or between the output side switch and the output side of the charging pile, and its output end is connected with the input end of the electric leakage detection circuit; The output end of the electric leakage detection circuit is connected with one side of the electric leakage communication module; The other side of the electric leakage communication module is used for connecting with the charging controller.

12. The charging station of claim 9, wherein, It further comprises: a current sensor; The current sensor is arranged between the input side switch and the input side of the charging pile, or between the output side switch and the output side of the charging pile; The input end of the current sensor is connected with the electric leakage detection circuit in the charging controller; The leakage threshold of the leakage detection circuit corresponds to the current working condition of the charging pile.

13. The charging station according to any one of claims 9 to 12, characterized in that, When the number of the power conversion units is greater than 1: Each of the power conversion units is connected to the input side of the charging pile through a corresponding input side switch; Alternatively, at least two of the power conversion units share the same input side switch.

14. The charging station according to any one of claims 9 to 12, characterized in that, The power conversion unit includes one power module or multiple parallelly connected power modules.

15. The charging pile according to claim 14, characterized in that, When the power grid is an alternating current power grid, the power module is an AC / DC conversion circuit or the power module includes a series connection of an AC / DC conversion circuit and a DC / DC conversion circuit; Alternatively, when the power grid is a direct current power grid, the power module is a DC / DC conversion circuit.

16. A method of leakage protection for a charging station, characterized in that, The leakage protection method is applied to the charging pile as claimed in any one of claims 9 to 15, and the leakage protection method includes: obtaining a leakage value of the charging pile; If the leakage value exceeds a leakage threshold, controlling the input side switch of the charging pile to be turned off.

17. The method of electric leakage protection of a charging station according to claim 16, characterized in that, The leakage threshold is the sum of a leakage increment and an operating leakage current of the charging pile under the current working condition; The operating leakage current is determined according to historical leakage data of the charging pile, and the leakage increment is determined according to a leakage current detection type under the power grid connected to the charging pile and a planned monitored leakage current.

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