Charging and discharging system and charging pile

Abstract

The invention discloses a charging and discharging system and a charging pile, belongs to the technical field of charging piles, and is used for charging and discharging among a plurality of energy storage modules, and the plurality of energy storage modules comprise a first energy storage module and a second energy storage module; the system comprises a first transmission module which is configured to be connected with a first energy storage module; the second transmission module is configured to be connected with a second energy storage module; the second transmission module is connected with the first transmission module through the first switch module to form a first charging and discharging circuit; when the first switch module is switched on, the first energy storage module and the second energy storage module carry out charging and discharging through the first charging and discharging circuit. According to the system provided by the invention, charging and discharging between the two energy storage modules can be realized through the first charging and discharging circuit, so that charging and discharging between the two electric vehicles are realized, the situation that the electric vehicles can only be transported to a charging pile to be charged when the electric quantity is exhausted is avoided, and the charging flexibility of the electric vehicles is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of charging piles, and in particular to a charging and discharging system and a charging pile. Background Art

[0002] At present, electric vehicles need to be connected to charging piles for charging, and charging piles are often installed in fixed locations and cannot be moved. When the electric vehicle's battery is too low, the owner needs to drive to the charging pile for charging. However, in some cases, the electric vehicle cannot reach the charging pile due to exhaustion and can only be transported to the charging pile by trailer for charging, which causes the owner to spend a lot of waiting time and energy. Summary of the invention

[0003] The embodiment of the present application aims to provide a charging and discharging system and a charging pile to solve the technical problem in the prior art that when the electric vehicle runs out of power, it can only be towed to a charging pile for charging.

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In a first aspect, a charging and discharging system is provided for charging and discharging between a plurality of energy storage modules, wherein the plurality of energy storage modules include a first energy storage module and a second energy storage module; the system includes:

[0006] a first transmission module, wherein the first transmission module is configured to be connected to the first energy storage module;

[0007] a second transmission module, the second transmission module being configured to connect to the second energy storage module;

[0008] The second transmission module is connected to the first transmission module through the first switch module to form a first charging and discharging circuit;

[0009] Wherein, when the first switch module is turned on, the first energy storage module and the second energy storage module are charged and discharged through the first charge and discharge circuit.

[0010] In combination with the first aspect, it also includes a first gun line, the first transmission module includes a first bidirectional DCDC module and a first filtering module, the first bidirectional DCDC module is connected to the first filtering module, and the first filtering module is connected to the first energy storage module through the first gun line.

[0011] In combination with the first aspect, it further includes a second gun line, the second transmission module includes a second bidirectional DCDC module and a second filtering module, the second bidirectional DCDC module is connected to the second filtering module, and the second filtering module is connected to the second energy storage module through the second gun line;

[0012] The second bidirectional DCDC module is connected to the first bidirectional DCDC module through the first switch module.

[0013] In combination with the first aspect, the device further includes a second switch module, wherein the second switch module is connected between the first gun line and the second gun line;

[0014] When the second switch module is turned on, the second switch module, the first transmission module and the second transmission module form a second charge and discharge circuit.

[0015] In combination with the first aspect, the first transmission module further includes a first EMC module and a first bidirectional ACDC module, the first bidirectional ACDC module is connected to the first bidirectional DCDC module, and the first bidirectional ACDC module is connected to the power grid through the first EMC module;

[0016] The first EMC module, the first bidirectional ACDC module, the first bidirectional DCDC module and the first filter module constitute a third charging and discharging circuit, and the power grid and the first energy storage module are charged and discharged through the third charging and discharging circuit.

[0017] In combination with the first aspect, the second transmission module further includes a second EMC module and a second bidirectional ACDC module, the second bidirectional ACDC module is connected to the second bidirectional DCDC module, and the second bidirectional ACDC module is connected to the power grid through the second EMC module;

[0018] The second EMC module, the second bidirectional ACDC module, the second bidirectional DCDC module and the second filter module constitute a fourth charge and discharge circuit, and the power grid and the second energy storage module are charged and discharged through the fourth charge and discharge circuit.

[0019] In combination with the first aspect, it also includes a control module, which is connected to the first switch module and the second switch module, and is configured to generate corresponding first control instructions and second control instructions in response to a charge and discharge request input from an external input, wherein the first control instruction is configured to control the on and off of the first switch module, and the second control instruction is configured to control the on and off of the second switch module.

[0020] In combination with the first aspect, it further includes a first auxiliary power supply, wherein the first auxiliary power supply is configured to obtain electric energy from the power grid to supply power to the first transmission module and the second transmission module when the power grid and the first energy storage module are charged and discharged;

[0021] The first auxiliary power supply is further configured to obtain electric energy from the first energy storage module to supply power to the first transmission module when the first energy storage module and the second energy storage module are charged and discharged.

[0022] In combination with the first aspect, it further includes a second auxiliary power supply, wherein the second auxiliary power supply is configured to obtain third electric energy from the power grid to supply power to the second transmission module when the power grid and the second energy storage module are charged and discharged;

[0023] The second auxiliary power supply is further configured to obtain fourth electric energy from the second energy storage module to supply power to the second transmission module when the second energy storage module and the first energy storage module are charging and discharging.

[0024] In combination with the first aspect, the first energy storage module and the second energy storage module are applied to an electric vehicle or an electrical load.

[0025] In a second aspect, a charging pile is provided, wherein the charging pile comprises a charging and discharging system as described in any one of the first aspects.

[0026] One of the above technical solutions has the following advantages or beneficial effects:

[0027] The embodiment of the present application provides a charging and discharging system for charging and discharging between multiple energy storage modules, wherein the multiple energy storage modules include a first energy storage module and a second energy storage module; the system includes: a first transmission module, the first transmission module is configured to connect to the first energy storage module; a second transmission module, the second transmission module is configured to connect to the second energy storage module; the second transmission module is connected to the first transmission module through a first switch module to form a first charging and discharging circuit; wherein, when the first switch module is turned on, the first energy storage module and the second energy storage module are charged and discharged through the first charging and discharging circuit. The charging and discharging system provided by the present application can realize the charging and discharging between the first energy storage module and the second energy storage module through the first charging and discharging circuit, thereby realizing the charging and discharging between two electric vehicles, avoiding the electric vehicle having to be towed to a charging pile for charging when the power is exhausted, improving the flexibility of electric vehicle charging, and reducing the waiting time and energy of the owner. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0029] Figure 1 A module schematic diagram of a charging and discharging system is provided for an embodiment of the present application;

[0030] Figure 2 A schematic diagram of module connection of a charging and discharging system provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of module connection of a charging and discharging system provided in another embodiment of the present application;

[0032] Figure 4 A schematic diagram of the connection between the first auxiliary power supply and each module provided in an embodiment of the present application;

[0033] Figure 5 A schematic diagram of the connection between the first auxiliary power supply and the second auxiliary power supply and each module provided in an embodiment of the present application;

[0034] Figure 6 A schematic diagram of internal module connections of a first auxiliary power supply and a second auxiliary power supply provided in an embodiment of the present application;

[0035] Figure 7 A schematic diagram of the internal structure of a first switch module provided in an embodiment of the present application;

[0036] Figure 8 A schematic diagram of the charging and discharging method flow chart provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. In the description of the present application, it is necessary to understand that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] The specific implementation methods of the present application are described below by way of examples:

[0039] like Figure 1As shown, the embodiment of the present application provides a charging and discharging system for charging and discharging between multiple energy storage modules, wherein the multiple energy storage modules include a first energy storage module and a second energy storage module; the system includes: a first transmission module, the first transmission module is configured to connect the first energy storage module; a second transmission module, the second transmission module is configured to connect the second energy storage module; the second transmission module is connected to the first transmission module through a first switch module to form a first charging and discharging circuit; wherein, when the first switch module is turned on, the first energy storage module and the second energy storage module are charged and discharged through the first charging and discharging circuit. Specifically, the first energy storage module and the second energy storage module are both composed of a battery module, a voltage monitoring circuit and a control circuit, wherein the battery module is used to store electrical energy, the voltage monitoring circuit is connected to the battery module, and is used to monitor the voltage state of the battery module, and the control circuit is connected to the battery module and the voltage monitoring circuit, and is used to control the charging and discharging process of the battery module, including current control, voltage control, and also forming corresponding early warning and protection for the battery module. In some embodiments of the present application, the first energy storage module and the second energy storage module may also include a supercapacitor, which may also be used to store electrical energy, so as to be applied to the corresponding equipment to power the equipment. The first transmission module and the second transmission module are both used to transmit electric energy between the first energy storage module and the second energy storage module. The first switch module is used to control the on and off of the first transmission module and the second transmission module, and the first switch module includes a relay, a transistor, and the like.

[0040] It can be understood that the charging and discharging system provided in the present application can realize the charging and discharging between the first energy storage module and the second energy storage module through the first charging and discharging circuit, thereby realizing the charging and discharging between the two electric vehicles, avoiding the electric vehicles having to be transported to the charging pile by trailer for charging when the power is exhausted, improving the flexibility of electric vehicle charging, and reducing the waiting time and energy of car owners.

[0041] like Figure 1 and Figure 2As shown, in an embodiment of the present application, a first gun line is also included, and the first transmission module includes a first bidirectional DCDC module and a first filtering module. The first bidirectional DCDC module is connected to the first filtering module, and the first filtering module is connected to the first energy storage module through the first gun line. Specifically, the first bidirectional DCDC module includes a bidirectional DCDC converter, and the bidirectional DCDC converter can be divided into two parts, including a boost converter and a buck converter. The boost converter boosts the low voltage input to a high voltage for output, while the buck converter bucks the high voltage input to a low voltage output, and the output voltage can be controlled by an adjustable switch. The first filtering module includes capacitors, inductors, LC filters, and RC filters, etc., which are used to filter out electromagnetic noise and interference during the transmission process, ensure the quality of the transmitted power, reduce the impact of noise and interference during the power transmission process on other devices, and improve the stability and reliability of the system.

[0042] In the embodiment of the present application, one end of the first gun line is connected to the first energy storage module, and the other end is connected to the first filter module and the first bidirectional DCDC module in sequence. When the first energy storage module needs to output electric energy to the outside, the first gun line transmits the electric energy to the first filter module for filtering, thereby filtering out the electromagnetic noise and interference when the first energy storage module outputs to the outside, improving the quality of the output electric energy, and then transforming the electric energy through the first bidirectional DCDC module, so that the output electric energy is adapted to the receiving end.

[0043] It can be understood that the electric energy in the first energy storage module can be transmitted to the first filtering module and the first bidirectional DCDC module through the first gun line, and the electromagnetic noise and interference in the electric energy can be filtered out by the first filtering module to ensure the quality of the output electric energy. Finally, the electric energy is transformed by the first bidirectional DCDC module to improve the adaptability of the output electric energy.

[0044] like Figure 1 and Figure 2 As shown, in the embodiment of the present application, a second gun line is also included, and the second transmission module includes a second bidirectional DCDC module and a second filtering module, the second bidirectional DCDC module is connected to the second filtering module, and the second filtering module is connected to the second energy storage module through the second gun line; wherein the second bidirectional DCDC module is connected to the first bidirectional DCDC module through the first switch module. Specifically, the second bidirectional DCDC module is the same as the first bidirectional DCDC module, including a DCDC converter; the second filtering module is the same as the first filtering module, both including capacitors, inductors, LC filters, and RC filters, etc., for filtering out electromagnetic noise and interference during the transmission process to ensure the quality of the transmitted power.

[0045] In the embodiment of the present application, one end of the second gun line is connected to the second energy storage module, and the other end is connected to the second filter module and the second bidirectional DCDC module in sequence. When the second energy storage module needs to output electric energy to the outside, the second gun line transmits the electric energy to the second filter module for filtering, thereby filtering out the electromagnetic noise and interference when the second energy storage module outputs to the outside, improving the quality of the output electric energy, and then transforming the electric energy through the second bidirectional DCDC module, so that the output electric energy is adapted to the receiving end.

[0046] It can be understood that the electric energy in the second energy storage module can be transmitted to the second filtering module and the second bidirectional DCDC module through the second gun line, and the electromagnetic noise and interference in the electric energy can be filtered out by the second filtering module to ensure the quality of the output electric energy, and then the electric energy is transformed by the second bidirectional DCDC module to improve the adaptability of the output electric energy.

[0047] like Figure 1 and Figure 2 As shown, in the embodiment of the present application, a second switch module is also included, and the second switch module is connected between the first gun line and the second gun line; when the second switch module is turned on, the second switch module, the first transmission module and the second transmission module constitute a second charge and discharge circuit; the first energy storage module is configured to be able to connect the first gun line and the second gun line and charge and discharge with the power grid through the second charge and discharge circuit; the second energy storage module is configured to be able to connect the first gun line and the second gun line and charge and discharge with the power grid through the second charge and discharge circuit. Specifically, the power grid referred to in the embodiment of the present application refers to a power system composed of a power plant, a transmission line, a substation and a distribution network, etc., which is used to transmit electric energy from the power plant to the end user. The power grid is usually composed of a high-voltage transmission network and a low-voltage distribution network. One end of the first transmission module is connected to the low-voltage distribution network, which is used to obtain electric energy from the power grid side, so as to realize charging of the first energy storage module. At the same time, when the power grid is at a peak, the first energy storage module can also discharge to the power grid, thereby reducing the load of the power grid. Therefore, when the second switch module is turned on, the first gun line and the second gun line are connected to the first transmission module and the second transmission module through the second switch module, and the first transmission module and the second transmission module are both connected to the power grid side. The first energy storage module can be connected to the first gun line and the second gun line at the same time, so that when the first energy storage module is fed, the power grid charges the first energy storage module through the second charge and discharge circuit, and when the power grid load is too large and the first energy storage module has sufficient power, the first energy storage module discharges to the power grid through the second charge and discharge circuit. Similarly, the second energy storage module can also be charged and discharged with the power grid through the second charge and discharge circuit. In an embodiment of the present application, the second switch module includes a parallel relay.

[0048] It is understandable that when the energy storage module is applied to the vehicle, the charging and discharging technology between the energy storage module and the power grid is called V2G technology, namely Vehicle-to-Grid, also known as bidirectional inverter charging technology. As the number of electric vehicles continues to increase, the pressure on the power grid will become greater and greater. The application of V2G technology can realize the distributed mobile energy storage unit function of electric vehicles. The power grid charges electric vehicles during low electricity consumption, and the electric vehicles discharge to the grid during peak electricity consumption. V2G technology can reduce the impact of electric vehicles on the power grid, adjust the power load, improve the quality of electricity, absorb renewable energy, and provide new dispatching resources for power system regulation.

[0049] like Figure 1 and Figure 2 As shown, in an embodiment of the present application, the first transmission module also includes a first EMC module and a first bidirectional ACDC module, the first bidirectional ACDC module is connected to the first bidirectional DCDC module, and the first bidirectional ACDC module is connected to the power grid through the first EMC module; wherein the first EMC module, the first bidirectional ACDC module, the first bidirectional DCDC module and the first filter module constitute a third charge and discharge circuit, and the power grid and the first energy storage module are charged and discharged through the third charge and discharge circuit. Specifically, the first bidirectional ACDC module is the same as the first bidirectional DCDC module and the second bidirectional DCDC module, and both can control the output voltage. The first EMC module is an electromagnetic compatibility (EMC) module, and its main function is to ensure that the device or system can work normally in its electromagnetic environment without causing interference to other devices and systems. Therefore, in the embodiment of the present application, when the first energy storage module needs to be charged, the electric energy input from the grid side passes through the first EMC module, the first bidirectional ACDC module, the first bidirectional DCDC module, the first filtering module and the first gun line in sequence to charge the first energy storage module; wherein, the first MEC module can prevent the electric energy from causing electromagnetic interference to the subsequent modules, the first bidirectional ACDC module and the first bidirectional DCDC module respectively transform the electric energy, the first filtering module filters the electric energy, and the first gun line inputs the adapted electric energy into the first energy storage module; similarly, when the first energy storage module needs to discharge to the grid, the electric energy is output through the first gun line, and then passes through the first filtering module, the first bidirectional DCDC module, the first bidirectional ACDC module and the first EMC module in sequence to be input into the grid; during discharge, the functions of each module are the same as those mentioned above, and the embodiment of the present application will not be elaborated on here.

[0050] It can be understood that connecting the first EMC module to the charging and discharging circuit of the power grid and the first energy storage module reduces the impact of electromagnetic interference on the first energy storage module when the power grid outputs electric energy; connecting the first bidirectional ACDC module and the first bidirectional DCDC module to the charging and discharging circuit of the power grid and the first energy storage module realizes the bidirectional charge and discharge conversion of different types of electric energy between the power grid and the first energy storage module; and the first filtering module realizes the filtering effect of the electric energy during charging and discharging between the power grid and the first energy storage module, avoiding the impact of noise in the electric energy on the power grid and the first energy storage module during the charging and discharging process.

[0051] like Figure 1 and Figure 2 As shown, in an embodiment of the present application, the second transmission module also includes a second EMC module and a second bidirectional ACDC module, the second bidirectional ACDC module is connected to the second bidirectional DCDC module, and the second bidirectional ACDC module is connected to the power grid through the second EMC module; wherein the second EMC module, the second bidirectional ACDC module, the second bidirectional DCDC module and the second filter module constitute a fourth charge and discharge circuit, and the power grid and the second energy storage module are charged and discharged through the fourth charge and discharge circuit. Specifically, the second transmission module is connected in the same way as the modules in the first transmission module, wherein the second bidirectional ACDC module is the same as the first bidirectional ACDC module, and both can transform the electric energy during the charging and discharging process between the power grid and the second energy storage module; the second EMC module is the same as the first EMC module, and both can avoid electromagnetic interference on the power grid side to other devices and systems. Therefore, the embodiment of the present application no longer repeats the role and function of the second bidirectional ACDC module and the second EMC module.

[0052] It can be understood that connecting the second EMC module to the charging and discharging circuit of the power grid and the second energy storage module reduces the impact of electromagnetic interference on the second energy storage module when the power grid outputs electric energy; connecting the second bidirectional ACDC module and the second bidirectional DCDC module to the charging and discharging circuit of the power grid and the second energy storage module realizes the bidirectional charge and discharge conversion of different types of electric energy between the power grid and the second energy storage module; and the second filter module realizes the filtering effect of the electric energy during charging and discharging between the power grid and the second energy storage module, avoiding the impact of noise in the electric energy on the power grid and the second energy storage module during the charging and discharging process.

[0053] like Figure 2 and Figure 3As shown, in the embodiment of the present application, a control module is further included, the control module is connected to the first switch module and the second switch module, and the control module is configured to generate corresponding first control instructions and second control instructions in response to external input charge and discharge requests, the first control instruction is configured to control the on and off of the first switch module, and the second control instruction is configured to control the on and off of the second switch module. Specifically, the control module is used to receive external input charge and discharge requests, and issue corresponding first control instructions and second control instructions according to the type of charge and discharge requests. Specifically, the level of the first control instruction can be used to control the on or off of the first switch module, and the level of the second control instruction can be used to control the on or off of the second switch module. When the first control instruction is at a high level, the first switch module is turned on, and when the first control instruction is at a low level, the first switch module is turned off; when the first switch module is turned on, the first transmission module and the second transmission module are connected, and the first energy storage module can be connected to the second energy storage module through the first transmission module and the second transmission module, thereby realizing charging and discharging between the two; when the second control instruction is at a high level, the second switch module is turned on, and when the second control instruction is at a low level, the second switch module is turned off; when the second switch module is turned on, the first gun line and the second gun line are connected, and the power grid can be connected to the first gun line and the second gun line respectively through the first transmission module and the second transmission module, thereby realizing charging and discharging with the first energy storage module or the second energy storage module respectively. In some other embodiments of the present application, when the first control instruction is at a low level, the first switch module can also be in a conducting state, and when the first control instruction is at a high level, the first switch module is in a disconnected state; similarly, when the second control instruction is at a low level, the second switch module can also be in a conducting state, and when the second control instruction is at a high level, the second switch module is in a disconnected state.

[0054] In the embodiment of the present application, it is worth noting that the control module includes a circuit or unit consisting of a microcontroller, a sensor, a communication module and a logic circuit, wherein the microcontroller is used to receive external input signals, process logic and generate control instructions. The sensor is used to detect external input signals, such as charge and discharge request signals. Depending on the specific application scenario, different types of sensors, such as button sensors, photosensitive sensors, temperature sensors, etc., need to be used. The communication module is used to communicate with an external device or system, receive external input signals and send control instructions. Common communication modules include serial communication, wireless communication (such as Wi-Fi, Bluetooth), etc. The logic circuit is used to process input signals and generate corresponding control instructions, including logic gates, triggers, counters, etc., for implementing specific logic functions.

[0055] It is understandable that the control module receives external charge and discharge requests and controls the first switch module and the second switch module according to the charge and discharge requests, thereby realizing charge and discharge control between the power grid, the first energy storage module and the second energy storage module or among the three.

[0056] like Figure 1 and Figure 2 As shown, in the embodiment of the present application, a first auxiliary power supply is further included. The first auxiliary power supply is configured to obtain electric energy from the power grid when the power grid and the first energy storage module are charged and discharged, so as to supply power to the first transmission module and the second transmission module; the first auxiliary power supply is also configured to obtain electric energy from the first energy storage module when the first energy storage module and the second energy storage module are charged and discharged, so as to supply power to the first transmission module. Specifically, as Figure 4 As shown, when the power grid is charged and discharged with the first energy storage module and the second energy storage module respectively through the first transmission module and the second transmission module, each submodule in the first transmission module and the second transmission module requires additional electric energy to realize the corresponding function. By setting the first auxiliary power supply, the corresponding electric energy can be obtained from the power grid, and converted into the working voltage of the first transmission module and the second transmission module through the first auxiliary power supply, so as to power each submodule in the first transmission module and the second transmission module. It is worth noting that the power grid side is three-phase electricity, and the electric energy of the three-phase electricity is converted into a 12V working voltage for each submodule to work through the conversion of the first auxiliary power supply.

[0057] When the power grid is disconnected from the first energy storage module and the second energy storage module, the first energy storage module can be used as an output end to charge the second energy storage module. At this time, the first auxiliary power supply can obtain electrical energy from the first energy storage module, and the first auxiliary power supply converts the electrical energy into a 12V working voltage to provide to each sub-module for operation.

[0058] It can be understood that by setting up the first auxiliary power supply, the first transmission module and the second transmission module can obtain the corresponding operating voltage when they are connected to the grid and off the grid, thereby ensuring that the first transmission module and the second transmission module can work normally, satisfying the charging and discharging between the power grid and the first energy storage module and the second energy storage module, and the charging of the second energy storage module by the first energy storage module, thereby reducing the use of external power supplies.

[0059] like Figure 1 and Figure 3As shown, in the embodiment of the present application, a second auxiliary power supply is also included. The second auxiliary power supply is configured to obtain a third electric energy from the power grid when the power grid and the second energy storage module are charged and discharged, so as to supply power to the second transmission module; the second auxiliary power supply is also configured to obtain a fourth electric energy from the second energy storage module when the second energy storage module and the first energy storage module are charged and discharged, so as to supply power to the second transmission module. Specifically, by setting the second auxiliary power supply, the corresponding third electric energy can be obtained from the power grid, and converted into the working voltage of the first transmission module and the second transmission module through the second auxiliary power supply, so as to supply power to each submodule in the first transmission module and the second transmission module.

[0060] It is worth noting that when the power grid is disconnected from the first energy storage module and the second energy storage module, the second energy storage module can be used as an output end to charge the first energy storage module. At this time, the second auxiliary power supply can obtain the fourth electrical energy from the second energy storage module, and the second auxiliary power supply converts the fourth electrical energy into a 12V working voltage and provides it to each sub-module for operation.

[0061] like Figure 3 , Figure 4 and Figure 5 As shown, in the embodiment of the present application, the first auxiliary power supply is connected to the power grid, the first transmission module and the first gun line, and the second auxiliary power supply is connected to the power grid, the second transmission module and the second gun line; therefore, when the power grid is charged and discharged with the first energy storage module and the second energy storage module through the first transmission module and the second transmission module, the first auxiliary power supply can convert the electric energy obtained from the power grid side into the working voltage of the first transmission module, and the second auxiliary power supply can convert the electric energy obtained from the power grid side into the working voltage of the second transmission module. In the off-grid mode, when the first energy storage module and the second energy storage module need to be charged and discharged, if the first energy storage module is used as the discharge end, the first auxiliary power supply obtains the corresponding electric energy from the first energy storage module and converts the electric energy into the working voltage of the first transmission module, and when the second energy storage module is used as the discharge end, the second auxiliary power supply obtains the corresponding electric energy from the second energy storage module and converts the electric energy into the working voltage of the second transmission module. The design of the first auxiliary power supply and the second auxiliary power supply can meet the charge and discharge control between the first transmission module and the second energy storage module and the power grid and the first energy storage module and the second energy storage module, and can also meet the charge and discharge control between the first energy storage module and the second energy storage module.

[0062] like Figure 6As shown, in an embodiment of the present application, the first auxiliary power supply and the second auxiliary power supply both include a grid rectifier circuit and a gun line rectifier circuit. The grid rectifier circuit is connected between the grid and the first transmission module and the second transmission module, and is used to convert the electric energy obtained from the grid side into a working voltage that can be adapted to the first transmission module and the second transmission module; and the gun line rectifier circuit is connected between the first gun line or the second gun line and the first transmission module and the second transmission module, and is used to convert the electric energy obtained from the first energy storage module or the second energy storage module side into a working voltage that can be adapted to the first transmission module and the second transmission module. Among them, the grid rectification circuit includes an input rectification and filtering module, a first buck conversion module and a first output rectification and filtering module. The input rectification and filtering module is connected to the grid, and is used to convert the alternating current provided by the grid into direct current and filter the current; the first buck conversion module is connected to the input rectification and filtering module, and is used to buck the direct current output by the input rectification and filtering module to meet the voltage requirements of each module in the first transmission module or the second transmission module; the first output rectification and filtering module is respectively connected to the first buck conversion module and the first transmission module or the second transmission module, and is used to further filter the current output by the first buck conversion module to avoid interference to the first transmission module and the second transmission module caused by the introduced noise The gun line rectification circuit includes an input filtering module, a second buck conversion module and a second output rectification filtering module; the input filtering module is connected to the first gun line or the second gun line, and is used to convert the direct current provided by the first gun line or the second gun line and filter the current; the second buck conversion module is connected to the input filtering module, and is used to buck the direct current output by the input filtering module to meet the voltage requirements of each module in the first transmission module or the second transmission module, and the second output rectification filtering module is respectively connected to the second buck conversion module and the first transmission module or the second transmission module, and is used to further filter the current output by the second buck conversion module to avoid interference of the introduced noise to the first transmission module and the second transmission module.

[0063] It can be understood that by providing the first auxiliary power supply and the second auxiliary power supply, the first transmission module and the second transmission module can obtain the corresponding operating voltage when connected to the grid and off the grid, thereby ensuring that the first transmission module and the second transmission module can work normally, satisfying the charging and discharging between the grid and the first energy storage module and the second energy storage module, and the charging and discharging of the first energy storage module to the second energy storage module, thereby reducing the use of external power supplies.

[0064] In an embodiment of the present application, the first energy storage module and the second energy storage module are applied to electric vehicles or electrical loads. Specifically, electric vehicles may include electric ships, electric vehicles, electric aircraft and other electric equipment according to the usage scenarios, among which electric vehicles may also be divided into one-wheeled electric vehicles, two-wheeled electric vehicles, three-wheeled electric vehicles, four-wheeled electric vehicles, electric buses and electric trucks according to the driving methods. The electrical loads include lighting equipment, kitchen appliances, heating appliances, refrigeration appliances and the like. After the first gun line is connected to the electric vehicle or the electrical load, the second energy storage module connected by the second gun line can be used to supply power to the electric vehicle or the electrical load, so as to realize charging of the electric vehicle or enable the electrical load to work normally.

[0065] It is worth noting that when the first energy storage module is used as the battery of the electric vehicle, the technology of discharging the battery of the electric vehicle to the power load is called V2L, i.e., Vehicle-to-Load, which means that the power of the vehicle is provided back to the household (rather than the power grid), and the power load can be powered by the energy storage battery or the battery directly connected to the electric vehicle. This makes the electric vehicle battery a backup power source, which can benefit those who live in places where the power grid is unstable. When both the first energy storage module and the second energy storage module are used as batteries for the electric vehicle, the charging and discharging between the two electric vehicles is called V2V, i.e., Vehicle-to-Vehicle. Since the current charging piles are often in fixed locations, when the electric vehicle runs out of power, it is impossible to drive to the charging pile in time for charging due to the long distance from the charging pile. At this time, the use of a bidirectional charger can enable vehicle-to-vehicle (V2V) transmission to charge the batteries of other electric vehicles. Accordingly, a special energy storage vehicle can also be developed as a mobile charging vehicle to charge the electric vehicle that is fed with power.

[0066] It can be understood that a variety of charging and discharging modes between the first energy storage module and the second energy storage module are realized through the first transmission module and the second transmission module, thereby meeting different user needs and improving the convenience of electricity use.

[0067] In summary, a charging and discharging system provided in an embodiment of the present application is applied to a charging pile, including a first transmission module and a second transmission module, wherein one end of the first transmission module and the second transmission module are connected to the three-phase power of the AC side, and the first EMC module and the first bidirectional ACDC module in the first transmission module convert the three-phase AC power into a DC bus voltage, wherein the positive pole of the bus is BUS+ and the negative pole of the bus is BUS-; the DC bus is connected to the first bidirectional DCDC module, and the bus voltage is converted into a DC voltage of 150V-1000V through the first bidirectional DCDC module and the first filter module; similarly, the second EMC module and the second bidirectional ACDC module in the second transmission module convert the three-phase AC power into a DC bus voltage; the DC bus is connected to the second bidirectional DCDC module, and the bus voltage is converted into a DC voltage of 150V-1000V through the second bidirectional DCDC module and the second filter module. The DC voltage is respectively input to the first energy storage module and the second energy storage module through the first gun line or the second gun line. It is worth noting that the first gun line and the second gun line can input or output 25kw of electric energy separately, and the first transmission module and the second transmission module can be connected in parallel through the second switch module, so that the first gun line or the second gun line can input or output 50kw of electric energy separately. Figure 7 As shown, the first switch module includes a bus switch box, which is composed of two switches, which are respectively used to control the on and off of the DC bus, such as the first positive bus BUS1+ and the first negative bus BUS1- are controlled by the first switch, and the second positive bus MUS2+ and the second negative bus BUS2- are controlled by the second switch. When charging and discharging, the first transmission module and the second transmission module can be connected in parallel by controlling the first switch and the second switch. It is conceivable that when the charging and discharging system is applied to a charging pile, a display screen can be set on the charging pile to obtain the user's selection through the display screen, thereby realizing charging and discharging.

[0068] It is worth noting that the charging and discharging system has a grid-connected mode connected to the grid and an off-grid mode disconnected from the grid. In the grid-connected mode, if the first gun line and the second gun line are connected to different electric vehicles respectively, the two gun lines can have four working modes, namely, grid-connected charging mode, grid-connected discharging mode, grid-connected charging / discharging mode and grid-connected V2V mode; and in the off-grid mode, the two gun lines can have two working modes, namely, off-grid V2L mode and off-grid V2V mode.

[0069] In the grid-connected charging mode, the first transmission module and the second transmission module obtain electric energy from the grid, and charge two electric vehicles respectively through the first gun line and the second gun line, that is, the first transmission module and the second transmission module do not affect each other; or, the second switch module is closed, and the first transmission module and the second transmission module obtain electric energy from the grid and charge one electric vehicle through the first gun line or the second gun line to output twice the electric energy, thereby improving the charging efficiency of the electric vehicle and shortening the charging time;

[0070] In the grid-connected discharge mode, the first transmission module and the second transmission module obtain electric energy from the two electric vehicles through the first gun line and the second gun line respectively, and release the electric energy to the grid; or, the second switch module is closed to obtain electric energy from the electric vehicle connected to the first gun line or the second gun line, and release the electric energy to the grid through the first transmission module and the second transmission module, thereby improving the discharge efficiency and shortening the discharge time;

[0071] In the grid-connected charging / discharging mode, the first transmission module obtains the electric energy in the grid and charges the electric vehicle through the first gun line, while the second transmission module obtains the electric energy in the electric vehicle and discharges it to the grid through the second gun line; or, the second transmission module obtains the electric energy in the grid and charges the electric vehicle through the second gun line, while the first transmission module obtains the electric energy in the electric vehicle and discharges it to the grid through the first gun line; through this grid-connected charging / discharging mode, the user can use any of the gun lines for charging or discharging without being restricted by the working state of the other gun line;

[0072] In the grid-connected V2V mode, when the grid load is large, one electric vehicle is used to charge another electric vehicle. At this time, the first auxiliary power supply or the second auxiliary power supply can draw power from the grid, close the first switch module, and if the first gun line is connected to the discharging car and the second gun line is connected to the charging car, select the first bidirectional DCDC module as the discharging state and the first bidirectional ACDC module as the charging state. At this time, the electric energy of the discharging car is charged by the first gun line, the first filter module, the first bidirectional DCDC module, the first switch module, the first bidirectional ACDC module, the second filter module and the second gun line to charge the charging car.

[0073] In the off-grid V2L mode, since the first transmission module is disconnected from the power grid, the first transmission module cannot obtain the corresponding electric energy from the power grid to work. At this time, the first auxiliary power supply obtains electric energy from the first energy storage module to provide working voltage to each module in the first transmission module and the second transmission module and the control module. After the first transmission module and the second transmission module start working, the electric energy is obtained from the first energy storage module through the first gun line to charge the second energy storage module; or the second auxiliary power supply obtains electric energy from the second energy storage module to provide working voltage to each module in the first transmission module and the second transmission module. After the first transmission module and the second transmission module start working, the electric energy is obtained from the second energy storage module through the second gun line to charge the first energy storage module;

[0074] In the off-grid V2V mode, since the first transmission module is disconnected from the power grid, if the first transmission module is connected to the discharging car and the second transmission module is connected to the charging car, the first auxiliary power supply takes power from the discharging car to provide working voltage to each module in the first transmission module and the second transmission module and the control module. The control module controls the first switch module to close. At this time, the electric energy of the discharging car is charged to the charging car through the first gun line, the first filter module, the first bidirectional DCDC module, the first switch module, the first bidirectional ACDC module, the second filter module and the second gun line; if the first transmission module is connected to the charging car and the second transmission module is connected to the discharging car, the charging route is exactly the opposite, and the embodiments of the present application are not described in detail here.

[0075] like Figure 8 As shown, the embodiment of the present application also provides a charging and discharging method, which is applied to the charging and discharging system provided by any of the above embodiments, and the method includes the following steps:

[0076] S1: Get the charge and discharge request from external input.

[0077] Specifically, the charging and discharging system mentioned in the above-mentioned embodiment of the present application can be integrated into the charging pile, and at least a housing, an input device, two charging guns and a bus connected to the power grid are provided on the charging pile, wherein the housing is used to carry the first transmission module, the second transmission module, the control module, the first auxiliary power supply, the second auxiliary power supply, the first switch module and the second switch module in the charging and discharging system; the two charging guns correspond to the first gun line and the second gun line in the charging and discharging system respectively; the input device includes a display screen and a keyboard, etc. The charging and discharging modes that can be realized by the charging pile are displayed on the display screen, and the user selects the corresponding charging and discharging mode by touching the display screen or the keyboard. After the control module recognizes the charging and discharging mode selected by the user, it forms a corresponding charging and discharging request.

[0078] S2: Based on the charge and discharge request, generate a first control instruction, where the first control instruction is configured to control the on and off of the first switch module.

[0079] Specifically, the control module sends a first control instruction to the first switch module according to the charge and discharge request; the first switch module is turned on or off according to the level of the first control instruction; when the first switch module is turned on, the first transmission module and the second transmission module are connected, and at this time, the first gun line is connected to the second gun line through the first transmission module and the second transmission module; when the first switch module is disconnected, the first transmission module and the second transmission module are disconnected, and the first gun line and the second gun line are also disconnected.

[0080] S3: In response to the first switch module being turned on, the first energy storage module is connected to the second energy storage module through the first charge and discharge circuit for charging and discharging; wherein the first charge and discharge circuit is composed of a first transmission module, a second transmission module and a first switch module, the first transmission module is connected to the first energy storage module, and the second transmission module is connected to the second energy storage module.

[0081] Specifically, since the first energy storage module is connected to the first gun line, and the second energy storage module is connected to the second gun line, when the first switch module is turned on, the first energy storage module is connected to the second energy storage module through the first gun line, the first transmission module, the first switch module, the second transmission module and the second gun line, and the first energy storage module and the second energy storage module can be charged and discharged. When the first switch module is disconnected, the first energy storage module and the second energy storage module are disconnected, and the two cannot be charged and discharged.

[0082] It is worth noting that the control module can also generate a second control instruction according to the charge and discharge request, and the level of the second control instruction can be used to control the conduction or disconnection of the second switch module. When the second switch module is turned on, the first gun line and the second gun line are connected, and the power grid can be connected to the first gun line and the second gun line respectively through the first transmission module and the second transmission module, thereby realizing charging and discharging with the first energy storage module or the second energy storage module respectively.

[0083] It can be understood that the charging and discharging method provided in the present application can realize the charging and discharging between the first energy storage module and the second energy storage module through the first charging and discharging circuit, thereby realizing the charging and discharging between the two electric vehicles, avoiding the electric vehicles having to be towed to the charging pile for charging when the power is exhausted, improving the flexibility of electric vehicle charging, and reducing the waiting time and energy of car owners.

[0084] The embodiment of the present application also provides a charging pile, which includes a charging and discharging system as provided in any of the above embodiments. The working process and principle of the charging pile have been described in detail in the above charging and discharging system, and the embodiment of the present application will not be repeated in detail.

[0085] The above is a detailed introduction to a charging and discharging system and a charging pile provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A charging and discharging system, characterized in that: Used for charging and discharging between multiple energy storage modules, wherein the multiple energy storage modules include a first energy storage module and a second energy storage module; the system includes: a first transmission module, wherein the first transmission module is configured to be connected to the first energy storage module; a second transmission module, the second transmission module being configured to connect to the second energy storage module; The second transmission module is connected to the first transmission module through the first switch module to form a first charging and discharging circuit; Wherein, when the first switch module is turned on, the first energy storage module and the second energy storage module are charged and discharged through the first charge and discharge circuit.

2. The charging and discharging system according to claim 1, characterized in that: It also includes a first gun line, the first transmission module includes a first bidirectional DCDC module and a first filtering module, the first bidirectional DCDC module is connected to the first filtering module, and the first filtering module is connected to the first energy storage module through the first gun line.

3. The charging and discharging system according to claim 2, characterized in that: It also includes a second gun line, the second transmission module includes a second bidirectional DCDC module and a second filtering module, the second bidirectional DCDC module is connected to the second filtering module, and the second filtering module is connected to the second energy storage module through the second gun line; The second bidirectional DCDC module is connected to the first bidirectional DCDC module through the first switch module.

4. The charging and discharging system according to claim 3, characterized in that: It also includes a second switch module, wherein the second switch module is connected between the first gun line and the second gun line; When the second switch module is turned on, the second switch module, the first transmission module and the second transmission module form a second charge and discharge circuit.

5. The charging and discharging system according to claim 4, characterized in that: The first transmission module further includes a first EMC module and a first bidirectional ACDC module, the first bidirectional ACDC module is connected to the first bidirectional DCDC module, and the first bidirectional ACDC module is connected to the power grid through the first EMC module; The first EMC module, the first bidirectional ACDC module, the first bidirectional DCDC module and the first filter module constitute a third charging and discharging circuit, and the power grid and the first energy storage module are charged and discharged through the third charging and discharging circuit.

6. The charging and discharging system according to claim 5, characterized in that: The second transmission module further includes a second EMC module and a second bidirectional ACDC module, the second bidirectional ACDC module is connected to the second bidirectional DCDC module, and the second bidirectional ACDC module is connected to the power grid through the second EMC module; The second EMC module, the second bidirectional ACDC module, the second bidirectional DCDC module and the second filter module constitute a fourth charge and discharge circuit, and the power grid and the second energy storage module are charged and discharged through the fourth charge and discharge circuit.

7. The charging and discharging system according to claim 6, characterized in that: It also includes a control module, which is connected to the first switch module and the second switch module. The control module is configured to generate corresponding first control instructions and second control instructions in response to external charge and discharge requests. The first control instruction is configured to control the on and off of the first switch module, and the second control instruction is configured to control the on and off of the second switch module.

8. The charging and discharging system according to claim 5, characterized in that: It also includes a first auxiliary power supply, which is configured to obtain electric energy from the power grid to supply power to the first transmission module and the second transmission module when the power grid and the first energy storage module are charged and discharged; The first auxiliary power supply is further configured to obtain electric energy from the first energy storage module to supply power to the first transmission module when the first energy storage module and the second energy storage module are charged and discharged.

9. The charging and discharging system according to claim 8, characterized in that: It also includes a second auxiliary power supply, which is configured to obtain third electric energy from the power grid to supply power to the second transmission module when the power grid and the second energy storage module are charged and discharged; The second auxiliary power supply is further configured to obtain fourth electric energy from the second energy storage module to supply power to the second transmission module when the second energy storage module and the first energy storage module are charging and discharging.

10. The charging and discharging system according to claim 1, characterized in that: The first energy storage module and the second energy storage module are applied to electric vehicles or electrical loads.

11. A charging pile, characterized in that: The charging pile comprises a charging and discharging system as described in any one of claims 1-10.

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