Automobile charging pile and electric automobile charging method

Abstract

The invention relates to an automobile charging pile and an automobile charging method, and the automobile charging pile comprises a plurality of AC-DC modules which are respectively connected with independent DC buses and can convert commercial power into DC for output. The charging distribution module is respectively connected with the direct current buses, the switch component is used for respectively controlling the access of each bus, the charging pile is used for being butted with an automobile charging port so as to obtain charging parameters required by an automobile, the charging parameters are sent to the power management module, and the power management module selects and controls the plurality of AC-DC modules to output proper direct current to the direct current buses. And the charging distribution module is controlled to receive the direct current on the direct-current bus and transmit the direct current to the charging pile in parallel as the charging current of the automobile. According to the scheme, each AC-DC module can be flexibly dispatched to supply power to each charging pile according to the requirements of the automobile, and the equipment utilization rate is improved. An energy storage battery stack and a DC-DC module can be arranged, the battery stack can store electricity in idle time and discharge electricity in busy time, and direct current is transmitted to the charging pile through the DC-DC module to serve as charging current. And the overall charging capability of the charging pile can be enhanced.

Description

Technical Field

[0001] The invention relates to a vehicle charging pile for charging an electric vehicle and a corresponding electric vehicle charging method. Background Art

[0002] At present, electric vehicles use rechargeable batteries to store energy and use motors as power to drive the car. Car charging piles are devices for charging electric vehicles. In order to achieve the purpose of fast charging, high-power charging piles are a development direction, that is, fast charging, which is suitable for installation in professional car charging stations.

[0003] Existing fast charging piles have a charging gun for connecting to the car's charging port, and a control circuit that communicates with the car to obtain the charging voltage and current required by the car. Each charging pile is equipped with a high-power power supply to convert the mains electricity into direct current suitable for the car. The direct current is transmitted to the car's battery pack through the charging gun to achieve charging.

[0004] With this implementation method, a car charging station needs to purchase multiple sets of fast-charging piles, and the equipment cost is relatively high. However, the maximum charging power that each car can support is different. If a slow-charging car occupies a fast-charging pile, the charging pile will only perform low-power charging, which is equivalent to reducing the efficiency of the charging equipment and is a waste of resources. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a car charging pile and a corresponding electric car charging method, which can uniformly dispatch and allocate several AC-DC modules to provide charging current for the corresponding charging pile according to the charging power required by the car, thereby improving the utilization rate of the equipment.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] Automobile charging stack, including charging pile, charging distribution module, power management module, and at least 2 AC-DC modules;

[0008] The input end of the AC-DC module is used to connect to the AC power supply end to obtain the mains power, and the output end of the AC-DC module is connected to a DC bus for converting the mains power into a preset DC power and transmitting it to the DC bus, and the output end of each AC-DC module is connected to an independent DC bus;

[0009] The charging distribution module comprises a plurality of charging bus terminals, and each charging bus terminal is respectively connected to one of the DC buses;

[0010] The charging distribution module also includes a charging control module and a charging pile terminal, wherein the charging pile terminal is connected to the charging pile for transmitting charging current to the charging pile;

[0011] Each of the charging busbar terminals is respectively connected to the charging pile terminals, and a switch component is respectively provided on the connection path, and the charging control module is respectively connected to each switch component for controlling the switch component;

[0012] The charging control module is connected to the power management module, and is used for the charging control module to obtain the charging instruction of the power management module, and control the connection path between the N charging bus terminals and the charging pile terminals according to the charging instruction;

[0013] The charging pile is used to connect to the charging port of the electric vehicle to obtain the charging parameters required by the electric vehicle and charge the electric vehicle. The power management module is connected to the charging pile, and the power management module communicates with the charging pile to obtain the charging parameters;

[0014] The power management module is also connected to the AC-DC module, and is used to control the X AC-DC modules to output DC power of an adaptive voltage according to the charging parameters, and the DC buses connected to the output terminals of the X AC-DC modules correspond to the DC buses connected to the N connected charging bus terminals;

[0015] The input end of the power module is used to connect to the AC power supply end to obtain AC power. The output end of the power module is respectively connected to the power management module and the charging distribution module, and is used to convert the AC power into DC power to power the power management module and the charging distribution module. The output end of the power module is also connected to the charging pile to provide DC power supply for the control circuit of the charging pile.

[0016] Furthermore, it also includes a battery stack, a power storage distribution module, and at least one DC-DC module;

[0017] The battery stack is used to store electric energy. The input end of the DC-DC module is connected to the battery stack. The output end of the DC-DC module is also connected to the DC bus. The DC-DC module receives the stored electricity from the battery stack and converts it into a preset DC power after DC transformation to be transmitted to the DC bus. The output end of each DC-DC module is connected to an independent DC bus.

[0018] The power storage distribution module includes a plurality of power storage bus terminals, and each power storage bus terminal is respectively connected to a DC bus connected to the AC-DC module, for obtaining the DC power output by the AC-DC module;

[0019] The power storage distribution module further includes a power storage control module and a battery stack terminal, wherein the battery stack terminal is connected to the battery stack and is used to deliver charging current to the battery stack;

[0020] Each of the power storage busbar terminals is respectively connected to the battery stack terminals, and a switch component is respectively provided on the connection path, and the power storage control module is respectively connected to each switch component for controlling the switch component;

[0021] The power storage control module is connected to the power management module, and is used for the power storage control module to obtain the power storage instruction of the power management module, and control the connection path between the L power storage bus terminals and the battery stack terminals according to the power storage instruction;

[0022] The power management module is connected to the battery stack, and is used for the power management module to communicate with the battery stack and obtain battery parameters of the battery stack. The power management module controls the L AC-DC modules to output DC power with an adaptive voltage according to the battery parameters, and the DC bus connected to the output ends of the L AC-DC modules corresponds to the DC bus connected to the L charging bus terminals that are connected;

[0023] The power management module is also connected to the DC-DC module, and is used to control the Y DC-DC modules to output DC power of an adaptive voltage according to the charging parameters, and the DC bus connected to the output ends of the Y DC-DC modules and / or the DC bus connected to the output ends of the X AC-DC modules correspond to the DC bus connected to the connected N charging bus terminals;

[0024] The output end of the power supply module is also connected to the power storage distribution module, and is used to convert the city power into direct current to supply power to the power storage distribution module.

[0025] Furthermore, it comprises at least 3 of the AC-DC modules, at least 2 of the charging distribution modules, and each charging distribution module is respectively connected to one of the charging piles.

[0026] Furthermore, the power management module is also provided with a storage module for recording the accumulated working time of each of the AC-DC modules.

[0027] The electric vehicle charging method uses the aforementioned vehicle charging stack and performs the following steps:

[0028] The charging pile detects that a car is connected, the charging pile communicates with the car to obtain the required charging parameters, and the power management module communicates with the charging pile to obtain the required charging parameters;

[0029] A power management module selects and controls X idle AC-DC modules to output adapted direct current according to the charging parameters;

[0030] The power management module obtains the battery parameters of the battery stack. If the battery parameters meet the preset values ​​and the DC-DC modules connected to the battery stack are idle, the battery stack meets the discharge conditions. Then, the power management module controls Y idle DC-DC modules to output DC power of the adapted voltage according to the charging parameters.

[0031] The power management module sends a charging instruction to the charging distribution module, so that the charging distribution module connects the connection path between the N charging bus terminals and the charging pile terminals, and the DC bus connected to the output ends of the Y DC-DC modules and the DC bus connected to the connected N charging bus terminals correspond.

[0032] The electric vehicle charging method uses the aforementioned vehicle charging stack and performs the following steps:

[0033] The charging pile detects that a car is connected, the charging pile communicates with the car to obtain the required charging parameters, and the power management module communicates with the charging pile to obtain the required charging parameters;

[0034] The power management module reads the accumulated working time of each AC-DC module recorded in the storage module, and selects and controls X idle AC-DC modules to output adapted direct current according to the charging parameters, and the accumulated working time of the X AC-DC modules ranks last among all idle AC-DC modules;

[0035] The power management module obtains the battery parameters of the battery stack. If the battery parameters meet the preset values ​​and the DC-DC modules connected to the battery stack are idle, the battery stack meets the discharge conditions. Then, the power management module controls Y idle DC-DC modules to output DC power of the adapted voltage according to the charging parameters.

[0036] The power management module sends a charging instruction to the charging distribution module, so that the charging distribution module connects the connection path between the N charging bus terminals and the charging pile terminals, and the DC bus connected to the output ends of the Y DC-DC modules and the DC bus connected to the connected N charging bus terminals correspond.

[0037] The beneficial effects of the present invention are as follows: the automobile charging stack and the corresponding charging method of the present scheme, wherein the multiple AC-DC modules can convert the mains electricity into direct current electricity, and the charging pile is used to connect with the automobile charging port and obtain the charging parameters required by the automobile, and the charging parameters are sent to the power management module. The power management module selects and controls several AC-DC modules to output appropriate direct current electricity to the DC bus according to the charging parameters, and the power management module also controls the charging distribution module to receive the direct current electricity on the aforementioned DC bus, and transmits it in parallel to the charging pile as the charging current of the automobile. Each AC-DC module can be flexibly dispatched to supply power to each charging pile according to the charging power required by the automobile, thereby improving the utilization rate of the equipment. In the preferred scheme, a battery stack and a DC-DC module for energy storage are also provided. The battery stack can store electric energy when idle and release electric energy when busy, and transmit it to the charging pile as the charging current of the automobile through the DC-DC module. The overall charging capacity of the charging stack can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a functional module diagram of an embodiment of a vehicle charging stack of the present solution;

[0039] Figure 2 It is a schematic diagram of an embodiment of a charging distribution module of a vehicle charging stack of the present scheme;

[0040] Figure 3 It is a schematic diagram of an embodiment of a power storage distribution module of a vehicle charging stack of the present scheme; DETAILED DESCRIPTION

[0041] The present invention is further described below with reference to the accompanying drawings and embodiments, which are typical examples:

[0042] Automobile charging stack, including charging pile, charging distribution module, power management module, and at least 2 AC-DC modules;

[0043] The input end of the AC-DC module is used to connect to the AC power supply end to obtain the mains power, and the output end of the AC-DC module is connected to a DC bus for converting the mains power into a preset DC power and transmitting it to the DC bus, and the output end of each AC-DC module is connected to an independent DC bus;

[0044] The charging distribution module comprises a plurality of charging bus terminals, and each charging bus terminal is respectively connected to one of the DC buses;

[0045] The charging distribution module also includes a charging control module and a charging pile terminal, wherein the charging pile terminal is connected to the charging pile for transmitting charging current to the charging pile;

[0046] Each of the charging busbar terminals is respectively connected to the charging pile terminals, and a switch component is respectively provided on the connection path, and the charging control module is respectively connected to each switch component for controlling the switch component;

[0047] The charging control module is connected to the power management module, and is used for the charging control module to obtain the charging instruction of the power management module, and control the connection path between the N charging bus terminals and the charging pile terminals according to the charging instruction;

[0048] The charging pile is used to connect to the charging port of the electric vehicle to obtain the charging parameters required by the electric vehicle and charge the electric vehicle. The power management module is connected to the charging pile, and the power management module communicates with the charging pile to obtain the charging parameters;

[0049] The power management module is also connected to the AC-DC module, and is used to control the X AC-DC modules to output DC power of an adaptive voltage according to the charging parameters, and the DC buses connected to the output terminals of the X AC-DC modules correspond to the DC buses connected to the N connected charging bus terminals;

[0050] The input end of the power module is used to connect to the AC power supply end to obtain AC power. The output end of the power module is respectively connected to the power management module and the charging distribution module, and is used to convert the AC power into DC power to power the power management module and the charging distribution module. The output end of the power module is also connected to the charging pile to provide DC power supply for the control circuit of the charging pile.

[0051] The basic principle of the car charging pile of this solution is that multiple AC-DC modules are used as the power supply shared by all charging piles. The charging piles are used to connect with the car. There is a power management module that selects and controls several AC-DC modules to operate and output DC power according to the charging parameters required by each charging pile to charge the car.

[0052] Specifically, Figure 1 As shown, the charging stack of this solution includes at least 2 AC-DC modules. If the AC power supply end has sufficient power, the more AC-DC modules there are, the stronger the external charging capability is, and the more charging piles can be supported. The more AC-DC modules there are, the better the coordination and scheduling of the power management module is, and the more charging power can be allocated to each charging pile.

[0053] The AC-DC module is used to convert AC power to DC power, which is equivalent to the power supply of a traditional charging pile, providing charging current for the charging pile. The AC-DC module can refer to the existing AC-DC conversion circuit.

[0054] like Figure 1As shown, the input end of the AC-DC module is used to connect to the AC power supply end to obtain AC power. The output end of each AC-DC module is connected to an independent DC bus to convert the AC power into preset DC power and transmit it to the DC bus. The charging distribution module draws power from multiple DC buses and transmits it in parallel to the charging pile to charge the car.

[0055] like Figure 1 , 2 As shown, the charging distribution module includes a plurality of charging bus terminals, each of which is connected to a DC bus.

[0056] The charging control module is connected to the power management module and is used to receive the charging instruction of the power management module. The charging control module controls the access to the appropriate DC bus according to the charging instruction.

[0057] like Figure 2 As shown, switch components K are respectively provided on the connection path from the charging bus terminal to the charging pile terminal. When the charging control module controls a certain switch component K to be turned on, the corresponding DC bus is connected to the charging pile terminal, and the DC power output by the AC-DC module corresponding to the DC bus will be delivered to the charging pile as the charging current for the car.

[0058] If the charging control module controls the connection path between N charging bus terminals and the charging pile terminals, the output power of N AC-DC modules is transmitted in parallel to the charging pile.

[0059] The switch component K may be a component using a relay, a contactor or other switch functions, and the charging control module may be implemented using a single chip microcomputer or other circuits with other control functions.

[0060] The power management module is also connected to the AC-DC module to control the AC-DC module to output appropriate direct current.

[0061] Specifically, the charging pile has a charging gun for connecting to the charging port of the electric vehicle. The control circuit inside the charging pile communicates with the car to obtain the charging parameters required by the electric car. The above can refer to the handshake process when the existing charging pile and the car are charging.

[0062] The power management module is connected to the charging pile, specifically to the control circuit of the charging pile, to obtain the charging parameters required by the car. Then, the power management module controls the AC-DC module to output appropriate direct current.

[0063] For example, a car requires a charging current of 750 volts and 200 amperes. Assuming that each AC-DC module supports an output current of 750 volts and 50 amperes, the power management module can control the four AC-DC modules numbered 1 to 4 to output 750 volts and 50 amperes respectively. These four DC currents are respectively transmitted to the four DC buses numbered 1 to 4.

[0064] The power management module controls the connection path between the corresponding four charging bus terminals numbered 1 to 4 and the charging pile terminals, and four 750-volt 50-amp currents are respectively delivered to the charging pile terminals, connected in parallel as 750-volt 200-amp currents delivered to the charging pile, and further delivered to the car, providing 750-volt 200-amp charging for the car.

[0065] For example, if a car needs a charging current of 500 volts and 100 amperes, the power management module can control two AC-DC modules to output 500 volts and 50 amperes of direct current respectively, which can be connected in parallel to provide a charging current of 500 volts and 100 amperes. The remaining AC-DC modules are in standby mode and can be allocated to other cars for charging when other cars are connected later.

[0066] The power management module can use a single chip microcomputer or other circuits with control functions, and the control technology of the output voltage of the AC-DC module can refer to the control principle of the existing switching power supply.

[0067] The charging stack of the present solution can select an appropriate number of AC-DC modules and charging piles according to the actual needs of users. For example, it can include at least 3 AC-DC modules and at least 2 charging distribution modules, and each charging distribution module is connected to one charging pile.

[0068] The more charging piles there are, the more cars can be charged at the same time, and the more AC-DC modules there are, the more flexibly the charging power can be allocated and scheduled.

[0069] like Figure 1 As shown, the power module provides low-voltage DC power supply for various circuit board controllers. The input end of the power module is used to connect to the AC power supply end to obtain the mains power. The output end of the power module is respectively connected to the power management module and the charging distribution module to convert and output low-voltage DC power such as 5V and 12V to power their circuits. It also provides 12V DC power supply for the switch components of the charging distribution module, such as relays.

[0070] The output end of the power module is also connected to the charging pile, specifically to the control circuit of the charging pile, to provide DC power for the control circuit of the charging pile. The power module can refer to various types of power circuits in the prior art.

[0071] In the charging stack of this solution, the more AC-DC modules there are, the more flexible the allocation and scheduling of the AC-DC modules are, but the total output power of the entire charging stack is limited by the power supply capacity of the AC power supply end.

[0072] More preferably, a battery stack for energy storage may be configured in the charging stack, allowing the battery stack to store electrical energy when idle, and when the car is charging at its peak, the electrical energy of the battery stack is released to charge the car, which can temporarily increase the total output capacity of the charging stack.

[0073] For example, it may also include a battery stack, a power storage distribution module, and at least one DC-DC module;

[0074] The battery stack is used to store electric energy. The input end of the DC-DC module is connected to the battery stack. The output end of the DC-DC module is also connected to the DC bus. The DC-DC module receives the stored electricity from the battery stack and converts it into a preset DC power after DC transformation to be transmitted to the DC bus. The output end of each DC-DC module is connected to an independent DC bus.

[0075] The power storage distribution module includes a plurality of power storage bus terminals, and each power storage bus terminal is respectively connected to a DC bus connected to the AC-DC module, for obtaining the DC power output by the AC-DC module;

[0076] The power storage distribution module further includes a power storage control module and a battery stack terminal, wherein the battery stack terminal is connected to the battery stack and is used to deliver charging current to the battery stack;

[0077] Each of the power storage busbar terminals is respectively connected to the battery stack terminals, and a switch component is respectively provided on the connection path, and the power storage control module is respectively connected to each switch component for controlling the switch component;

[0078] The power storage control module is connected to the power management module, and is used for the power storage control module to obtain the power storage instruction of the power management module, and control the connection path between the L power storage bus terminals and the battery stack terminals according to the power storage instruction;

[0079] The power management module is connected to the battery stack, and is used for the power management module to communicate with the battery stack and obtain battery parameters of the battery stack. The power management module controls the L AC-DC modules to output DC power with an adaptive voltage according to the battery parameters, and the DC bus connected to the output ends of the L AC-DC modules corresponds to the DC bus connected to the L charging bus terminals that are connected;

[0080] The power management module is also connected to the DC-DC module, and is used to control the Y DC-DC modules to output DC power of an adaptive voltage according to the charging parameters, and the DC bus connected to the output ends of the Y DC-DC modules and / or the DC bus connected to the output ends of the X AC-DC modules correspond to the DC bus connected to the connected N charging bus terminals;

[0081] The output end of the power supply module is also connected to the power storage distribution module, and is used to convert the city power into direct current to supply power to the power storage distribution module.

[0082] In this preferred solution, a battery stack, a power storage distribution module, and at least one DC-DC module are added to the original charging stack.

[0083] The battery stack can be formed by connecting multiple rechargeable batteries in series and parallel, which can store more electrical energy. It can also refer to existing commercial energy storage devices. The battery stack is also equipped with a BMS (Battery Management System) to monitor battery parameters and control the charging and discharging of the battery stack.

[0084] The DC-DC module is used for DC voltage conversion, and the existing DC voltage conversion technology can be referred to. Its input end is connected to the battery stack, and the output end is also connected to the DC bus. The DC-DC module converts the stored power of the battery stack into a preset DC power and transmits it to the DC bus, which is similar to the AC-DC module transmitting to the DC bus.

[0085] like Figure 1 As shown, in this embodiment, there are 2 DC-DC modules and 4 AC-DC modules. The output end of each module is connected to a DC bus, for a total of 6 DC buses. The DC-DC module and the AC-DC module can output direct current to the corresponding DC bus. In this solution, the charging bus terminal of the charging distribution module is also connected to the DC bus connected to the DC-DC module, for example Figure 1 In the embodiment, the charging busbar terminals of the charging distribution module are respectively connected to all six DC buses, so that the DC power output by the DC-DC module and the AC-DC module can be delivered to the charging pile through the charging distribution module.

[0086] like Figure 3 As shown, the function principle of the power storage distribution module is similar to that of the charging distribution module. Its power storage bus terminal is respectively connected to the DC bus connected to the AC-DC module, and is used to receive the DC power output by the AC-DC module. Its battery stack terminal is connected to the battery stack, and then the DC power output by the AC-DC module is transmitted to the battery stack, that is, charging the battery stack.

[0087] Similar to the charging distribution module, there is a power storage control module that controls the switch components on the connection path between each power storage bus terminal and the battery stack terminal.

[0088] The power storage control module is connected to the power management module to obtain the power storage instructions of the power management module. The purpose of the power storage instructions is to allow the direct current output by several AC-DC modules to pass through the power storage distribution module and be transmitted to the battery stack to store the electrical energy in the battery stack.

[0089] The power management module is also connected to the battery stack to obtain battery parameters of the battery stack, and is usually connected to the BMS of the battery stack to obtain battery parameters such as voltage and temperature of the battery stack.

[0090] The power management module controls the AC-DC module to output an adaptive voltage according to the battery parameters. For example, if the battery stack voltage is detected to be lower than the preset value, indicating that it is in a low-power state and needs to be charged, the power management module controls L idle AC-DC modules to output DC power according to the charging voltage value of the battery stack. The DC power will be transmitted to the corresponding DC bus respectively.

[0091] The power management module sends a power storage instruction to the power storage control module to turn on the switch components of the corresponding L charging bus terminals. The direct current output by the L AC-DC modules is then transmitted to the battery stack via the power storage distribution module to charge the battery stack.

[0092] The above is a scenario when the battery stack is charging. When the voltage of the battery stack is higher than the preset value, indicating that the battery stack has sufficient power, the battery stack can discharge to the outside to provide charging current for the car.

[0093] For example, the charging pile detects that a car is connected, the charging pile communicates with the car to obtain the required charging parameters, and the power management module communicates with the charging pile to obtain the required charging parameters;

[0094] A power management module selects and controls X idle AC-DC modules to output adapted direct current according to the charging parameters;

[0095] The power management module obtains the battery parameters of the battery stack. If the battery parameters meet the preset values ​​and the DC-DC modules connected to the battery stack are idle, the battery stack meets the discharge conditions. Then, the power management module controls Y idle DC-DC modules to output DC power of the adapted voltage according to the charging parameters.

[0096] The power management module sends a charging instruction to the charging distribution module, so that the charging distribution module connects the connection path between the N charging bus terminals and the charging pile terminals, and the DC bus connected to the output ends of the Y DC-DC modules and the DC bus connected to the connected N charging bus terminals correspond.

[0097] by Figure 1 Taking the implementation example, assuming that the management power module obtains the charging parameters required by the car as 750 volts and 300 amps, the total power is 225 kilowatts, but the maximum power supported by the AC power supply is 150 kilowatts. At this time, the battery stack and DC-DC module can provide the insufficient power on the AC power supply side.

[0098] like Figure 1 As shown, the two DC-DC modules convert and output 750V 50A DC power respectively, and the four AC-DC modules convert and output 750V 50A DC power respectively.

[0099] The power management module controls the charging distribution module and connects the switch components corresponding to the six charging bus terminals. Then, six 750V 50A DC currents are transmitted in parallel to the charging piles, thereby providing the car with a charging current of 750V 300A. At this time, the charging power has exceeded the maximum power supply of the AC power supply terminal, which is equivalent to temporarily increasing the total output capacity of the charging pile with the help of the battery stack and DC-DC module to meet the high-power fast charging requirements.

[0100] In this solution, the DC bus connected to the output ends of the Y DC-DC modules and / or the DC bus connected to the output ends of the X AC-DC modules correspond to the DC bus connected to the N connected charging bus terminals.

[0101] It refers to the DC bus connected to the output terminals of Y DC-DC modules, plus the DC bus connected to the output terminals of X AC-DC modules, corresponding to the DC bus connected to the N charging bus terminals that are turned on.

[0102] Or the DC bus connected to the output terminals of the Y DC-DC modules belongs to the DC bus connected to the N charging bus terminals that are turned on.

[0103] Or the DC bus connected to the output terminals of the X AC-DC modules belongs to the DC bus connected to the N connected charging bus terminals.

[0104] The direct current output by the DC-DC module and AC-DC can be transmitted to the required charging piles through the charging distribution module.

[0105] In this preferred embodiment, the power supply module also provides low-voltage DC power supply to the power storage distribution module, which is similar to the power supply of the aforementioned charging distribution module.

[0106] In addition, the power management module can determine when to charge the battery stack according to the tiered electricity price period, and can also determine which AC-DC modules to select for operation or standby according to other preset conditions, such as selecting AC-DC modules to operate according to the accumulated working hours of the AC-DC modules. The power management module needs to be provided with a storage module, such as a memory card, for recording the accumulated working hours of each of the AC-DC modules.

[0107] The operation process of the charging stack can be as follows:

[0108] The charging pile detects that a car is connected, the charging pile communicates with the car to obtain the required charging parameters, and the power management module communicates with the charging pile to obtain the required charging parameters;

[0109] The power management module reads the accumulated working time of each AC-DC module recorded in the storage module, and selects and controls X idle AC-DC modules to output adapted direct current according to the charging parameters, and the accumulated working time of the X AC-DC modules ranks last among all idle AC-DC modules;

[0110] The power management module obtains the battery parameters of the battery stack. If the battery parameters meet the preset values ​​and the DC-DC modules connected to the battery stack are idle, the battery stack meets the discharge conditions. Then, the power management module controls Y idle DC-DC modules to output DC power of the adapted voltage according to the charging parameters.

[0111] The power management module sends a charging instruction to the charging distribution module, so that the charging distribution module connects the connection path between the N charging bus terminals and the charging pile terminals, and the DC bus connected to the output ends of the Y DC-DC modules and the DC bus connected to the connected N charging bus terminals correspond.

[0112] The charging operation principle of the charging stack is basically the same as mentioned above. When selecting an idle AC-DC module, the cumulative working time of the AC-DC module will be considered, and the modules with the lowest cumulative working time among the idle AC-DC modules will be selected for operation output.

[0113] This way, the cumulative usage time of all AC-DC modules can be basically the same, and some modules will not be overused and damaged prematurely.

Claims

1. A car charging stack, characterized in that: Includes charging pile, charging distribution module, power management module, and at least 2 AC-DC modules; The input end of the AC-DC module is used to connect to the AC power supply end to obtain the mains power, and the output end of the AC-DC module is connected to a DC bus for converting the mains power into a preset DC power and transmitting it to the DC bus, and the output end of each AC-DC module is connected to an independent DC bus; The charging distribution module comprises a plurality of charging bus terminals, and each charging bus terminal is respectively connected to one of the DC buses; The charging distribution module also includes a charging control module and a charging pile terminal, wherein the charging pile terminal is connected to the charging pile for transmitting charging current to the charging pile; Each of the charging busbar terminals is respectively connected to the charging pile terminals, and a switch component is respectively provided on the connection path, and the charging control module is respectively connected to each switch component for controlling the switch component; The charging control module is connected to the power management module, and is used for the charging control module to obtain the charging instruction of the power management module, and control the connection path between the N charging bus terminals and the charging pile terminals according to the charging instruction; The charging pile is used to connect to the charging port of the electric vehicle to obtain the charging parameters required by the electric vehicle and charge the electric vehicle. The power management module is connected to the charging pile, and the power management module communicates with the charging pile to obtain the charging parameters; The power management module is also connected to the AC-DC module, and is used to control the X AC-DC modules to output DC power of an adaptive voltage according to the charging parameters, and the DC buses connected to the output terminals of the X AC-DC modules correspond to the DC buses connected to the N connected charging bus terminals; The input end of the power module is used to connect to the AC power supply end to obtain AC power. The output end of the power module is respectively connected to the power management module and the charging distribution module, and is used to convert the AC power into DC power to power the power management module and the charging distribution module. The output end of the power module is also connected to the charging pile to provide DC power supply for the control circuit of the charging pile.

2. The vehicle charging stack according to claim 1, characterized in that: Also includes a battery stack, a power storage distribution module, and at least one DC-DC module; The battery stack is used to store electric energy. The input end of the DC-DC module is connected to the battery stack. The output end of the DC-DC module is also connected to the DC bus. The DC-DC module receives the stored electricity from the battery stack and converts it into a preset DC power after DC transformation to be transmitted to the DC bus. The output end of each DC-DC module is connected to an independent DC bus. The power storage distribution module includes a plurality of power storage bus terminals, and each power storage bus terminal is respectively connected to a DC bus connected to the AC-DC module, for obtaining the DC power output by the AC-DC module; The power storage distribution module further includes a power storage control module and a battery stack terminal, wherein the battery stack terminal is connected to the battery stack and is used to deliver charging current to the battery stack; Each of the power storage busbar terminals is respectively connected to the battery stack terminals, and a switch component is respectively provided on the connection path, and the power storage control module is respectively connected to each switch component for controlling the switch component; The power storage control module is connected to the power management module, and is used for the power storage control module to obtain the power storage instruction of the power management module, and control the connection path between the L power storage bus terminals and the battery stack terminals according to the power storage instruction; The power management module is connected to the battery stack, and is used for the power management module to communicate with the battery stack and obtain battery parameters of the battery stack. The power management module controls the L AC-DC modules to output DC power with an adaptive voltage according to the battery parameters, and the DC bus connected to the output ends of the L AC-DC modules corresponds to the DC bus connected to the L charging bus terminals that are connected; The power management module is also connected to the DC-DC module, and is used to control the Y DC-DC modules to output DC power of an adaptive voltage according to the charging parameters, and the DC bus connected to the output ends of the Y DC-DC modules and / or the DC bus connected to the output ends of the X AC-DC modules correspond to the DC bus connected to the connected N charging bus terminals; The output end of the power supply module is also connected to the power storage distribution module, and is used to convert the city power into direct current to supply power to the power storage distribution module.

3. The vehicle charging stack as claimed in claim 2, characterized in that: It comprises at least 3 AC-DC modules and at least 2 charging distribution modules, and each charging distribution module is respectively connected to one charging pile.

4. The vehicle charging stack as claimed in claim 3, characterized in that: The power management module is also provided with a storage module for recording the accumulated working time of each of the AC-DC modules.

5. An electric vehicle charging method, characterized in that: Using the automobile charging stack as claimed in claim 3, the following steps are performed: The charging pile detects that a car is connected, the charging pile communicates with the car to obtain the required charging parameters, and the power management module communicates with the charging pile to obtain the required charging parameters; A power management module selects and controls X idle AC-DC modules to output adapted direct current according to the charging parameters; The power management module obtains the battery parameters of the battery stack. If the battery parameters meet the preset values ​​and the DC-DC modules connected to the battery stack are idle, the battery stack meets the discharge conditions. Then, the power management module controls Y idle DC-DC modules to output DC power of the adapted voltage according to the charging parameters. The power management module sends a charging instruction to the charging distribution module, so that the charging distribution module connects the connection path between the N charging bus terminals and the charging pile terminals, and the DC bus connected to the output ends of the Y DC-DC modules and the DC bus connected to the connected N charging bus terminals correspond.

6. An electric vehicle charging method, characterized in that: Using the automobile charging stack as claimed in claim 4, the following steps are performed: The charging pile detects that a car is connected, the charging pile communicates with the car to obtain the required charging parameters, and the power management module communicates with the charging pile to obtain the required charging parameters; The power management module reads the accumulated working time of each AC-DC module recorded in the storage module, and selects and controls X idle AC-DC modules to output adapted direct current according to the charging parameters, and the accumulated working time of the X AC-DC modules ranks last among all idle AC-DC modules; The power management module obtains the battery parameters of the battery stack. If the battery parameters meet the preset values ​​and the DC-DC modules connected to the battery stack are idle, the battery stack meets the discharge conditions. Then, the power management module controls Y idle DC-DC modules to output DC power of the adapted voltage according to the charging parameters. The power management module sends a charging instruction to the charging distribution module, so that the charging distribution module connects the connection path between the N charging bus terminals and the charging pile terminals, and the DC bus connected to the output ends of the Y DC-DC modules and the DC bus connected to the connected N charging bus terminals correspond.

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