Charging control method and device

Abstract

The embodiment of the invention provides a charging control method and device, the charging control method is applied to a charging system, the charging system comprises a multi-winding transformer, at least two energy storage converters and at least two rechargeable batteries, and the number of secondary windings of the multi-winding transformer is larger than or equal to the number of the energy storage converters. Each energy storage converter is connected with at least one secondary winding, and the method comprises the steps: determining the charging demand voltage of a target rechargeable battery and the input voltage of a target energy storage converter connected with the target rechargeable battery under the condition that the charging demand of the target rechargeable battery is detected, performing voltage conversion on an alternating current power supply of the power supply equipment according to the input voltage through the multi-winding transformer to obtain a converted alternating current power supply; performing conversion processing on the converted alternating current power supply according to the charging demand voltage through the target energy storage converter to obtain a direct current power supply; and transmitting the direct-current power supply to the target rechargeable battery to charge the target rechargeable battery.

Description

Technical Field

[0001] The embodiments of this specification relate to the technical field of electric vehicle battery swap stations, and in particular to a charging control method. Background Art

[0002] In recent years, with the increase in the number of electric vehicles in use, the way of providing energy replenishment for electric vehicles has been constantly improving. The current energy replenishment methods are mainly charging and battery replacement. Charging requires a long charging time, while battery replacement can achieve rapid energy replenishment for electric vehicles. Therefore, battery swap stations came into being.

[0003] Most of the current battery swap stations use multiple separate chargers to charge the batteries in the station. The charging process usually converts the AC power supply on the grid side into a DC power supply that matches the battery voltage through an AC-DC rectifier circuit and a DC-DC buck-boost circuit, and then charges the battery. However, due to the multiple AC-DC conversions and voltage conversions of the power supply in this process, the power loss is large, and the DC-DC buck-boost circuit has electrical isolation, which further increases the power loss. Therefore, an effective method is urgently needed to solve this problem. Summary of the invention

[0004] In view of this, an embodiment of this specification provides a charging control method. One or more embodiments of this specification also relate to a charging control device, a computing device, a computer-readable storage medium and a computer program to solve the technical defects existing in the prior art.

[0005] According to a first aspect of an embodiment of this specification, a charging control method is provided, which is applied to a charging system, wherein the charging system includes a multi-winding transformer, at least two energy storage converters, and at least two rechargeable batteries, wherein the number of secondary windings of the multi-winding transformer is greater than or equal to the number of energy storage converters, and each energy storage converter is connected to at least one secondary winding, and the method includes:

[0006] In the case of detecting that a target rechargeable battery has a charging demand, determining a charging demand voltage of the target rechargeable battery and an input voltage of a target energy storage converter connected to the target rechargeable battery, wherein the target rechargeable battery is any one or at least two of the at least two rechargeable batteries;

[0007] Performing voltage conversion on the AC power supply of the power supply device according to the input voltage through the multi-winding transformer to obtain the converted AC power supply;

[0008] The target energy storage converter converts the converted AC power supply according to the charging requirement voltage to obtain a corresponding DC power supply;

[0009] The DC power supply is delivered to the target rechargeable battery to charge the target rechargeable battery.

[0010] Optionally, the performing voltage conversion on the AC power supply of the power supply device according to the input voltage by the multi-winding transformer includes:

[0011] Determining a target secondary winding connected to the target energy storage converter;

[0012] The AC power supply of the power supply device is converted into voltage according to the input voltage through the primary winding of the multi-winding transformer and the target secondary winding.

[0013] Optionally, the energy storage converter includes an AC / DC converter;

[0014] Correspondingly, the converting process of the converted AC power source according to the charging requirement voltage by the target energy storage converter includes:

[0015] The converted AC power source is converted according to the charging requirement voltage by an AC / DC converter included in the target energy storage inverter.

[0016] Optionally, the charging system further comprises a DC / DC converter, and the DC / DC converter is electrically connected to the energy storage converter;

[0017] Accordingly, the method further comprises:

[0018] In response to a charging request from a device to be charged, determining a charging requirement voltage of the device to be charged, and determining an input voltage and an output voltage range of an energy storage converter connected to the DC / DC converter;

[0019] When it is determined that the charging requirement voltage of the device to be charged does not fall within the output voltage range, converting the DC power supply according to the charging requirement voltage of the device to be charged by the DC / DC converter to obtain a converted DC power supply;

[0020] The converted DC power is delivered to the device to be charged for charging.

[0021] Optionally, the charging system further comprises a charging gun, and the charging gun is electrically connected to the DC / DC converter;

[0022] Accordingly, the method further comprises:

[0023] Receiving a charging request sent by the device to be charged through the charging gun, wherein the charging request carries a charging requirement message;

[0024] The DC power source is converted by the DCDC converter according to the charging requirement voltage carried in the charging requirement message to obtain a converted DC power source;

[0025] The converted DC power is transmitted to the charging gun, and the device to be charged is charged through the charging gun.

[0026] Optionally, the charging system further includes an in-station distribution box, which is electrically connected to the multi-winding transformer and is used to supply power to a centralized control module in the charging system.

[0027] Optionally, the charging control method further includes:

[0028] When it is detected that the target rechargeable battery has a discharge requirement, performing a discharge process on the target rechargeable battery;

[0029] The target energy storage converter converts the DC power output by the target rechargeable battery to obtain a corresponding AC power;

[0030] The multi-winding transformer converts the AC power into an AC power consistent with the power supply voltage of the power supply device and transmits the AC power to the power supply device.

[0031] According to a second aspect of an embodiment of this specification, a charging control device is provided, which is applied to a charging system, wherein the charging system includes a multi-winding transformer, at least two energy storage converters, and at least two rechargeable batteries, wherein the number of secondary windings of the multi-winding transformer is greater than or equal to the number of energy storage converters, and each energy storage converter is connected to at least one secondary winding, and the device includes:

[0032] A determination module is configured to determine the charging requirement voltage of the target rechargeable battery and the input voltage of the target energy storage converter connected to the target rechargeable battery when it is detected that the target rechargeable battery has a charging requirement, wherein the target rechargeable battery is any one or at least two of the at least two rechargeable batteries;

[0033] A first conversion module is configured to perform voltage conversion on the AC power supply of the power supply device according to the input voltage through the multi-winding transformer to obtain a converted AC power supply;

[0034] A second conversion module is configured to convert the converted AC power supply according to the charging requirement voltage through the target energy storage converter to obtain a corresponding DC power supply;

[0035] The charging module is configured to transmit the DC power supply to the target rechargeable battery to charge the target rechargeable battery.

[0036] According to a third aspect of an embodiment of this specification, a computing device is provided, including:

[0037] Memory and processor;

[0038] The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions to implement any step of the charging control method.

[0039] According to a fourth aspect of the embodiments of this specification, a computer-readable storage medium is provided, which stores computer-executable instructions, and when the instructions are executed by a processor, the steps of any one of the charging control methods are implemented.

[0040] According to a fifth aspect of the embodiments of this specification, a computer program is provided, wherein when the computer program is executed in a computer, the computer is caused to execute the steps of the above-mentioned charging control method.

[0041] In one embodiment of the present specification, when it is detected that the target rechargeable battery has a charging demand, the charging demand voltage of the target rechargeable battery and the input voltage of the target energy storage converter connected to the target rechargeable battery are determined, wherein the target rechargeable battery is any one or at least two of the at least two rechargeable batteries; the AC power supply of the power supply equipment is converted by the multi-winding transformer according to the input voltage to obtain the converted AC power supply; the converted AC power supply is converted by the target energy storage converter according to the charging demand voltage to obtain the corresponding DC power supply; the DC power supply is transmitted to the target rechargeable battery to charge the target rechargeable battery. Since the AC side of each group of PCS is connected to different secondary windings, AC electrical isolation is achieved. When the battery is charged and discharged, mutual interference of insulation detection between each output circuit is eliminated, which is conducive to reducing power loss, thereby facilitating improving the utilization rate of power. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a flow chart of a charging control method provided by an embodiment of this specification;

[0043] Figure 2 is an architecture diagram of a charging control system provided by an embodiment of this specification;

[0044] Figure 3 It is a structural schematic diagram of an energy storage converter charging bin provided by an embodiment of this specification;

[0045] Figure 4 It is a schematic diagram of a circuit inside an energy storage converter provided in one embodiment of this specification;

[0046] Figure 5 It is a structural schematic diagram of a charging control device provided by an embodiment of this specification;

[0047] Figure 6 It is a structural block diagram of a computing device provided by an embodiment of this specification. DETAILED DESCRIPTION

[0048] Many specific details are described in the following description to facilitate a full understanding of this specification. However, this specification can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of this specification, so this specification is not limited to the specific implementation disclosed below.

[0049] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms of "a", "said" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0050] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0051] First, the terms involved in one or more embodiments of this specification are explained.

[0052] Power Conversion System (PCS): also known as bidirectional energy storage inverter, is the core component that realizes the bidirectional flow of electric energy between the energy storage system and the power grid. It is used to control the charging and discharging process of the battery and perform AC / DC conversion.

[0053] Alternating Current-to-Direct Current converter: also known as AC / DC converter, is a device that converts alternating current into direct current. Its power flow can be bidirectional. The power flow from the power source to the load is called rectification, and the power flow from the load back to the power source is called active inversion.

[0054] DC-to-DC converter: Also known as a DC / DC converter, it is a circuit or electromechanical device for converting electrical energy. It can convert a direct current (DC) power supply into a DC (or near-DC) power supply of a different voltage.

[0055] At present, battery swap stations use multiple separate chargers to charge the batteries in the station. This mode has high equipment cost and large power loss. If a rectifier charging module with a primary change architecture (i.e., an architecture with only an AC-DC rectifier circuit) is used, there are multiple charging modules connected in parallel and the modules themselves are not electrically isolated, which causes the battery insulation detection to be affected by other loads and falsely report faults.

[0056] In this specification, a charging control method is provided. This specification also relates to a charging control device, a computing device, a computer-readable storage medium, and a computer program, which are described in detail one by one in the following embodiments.

[0057] Figure 1 A flow chart of a charging control method provided according to an embodiment of the present specification is shown. The charging control method is applied to a charging system, wherein the charging system includes a multi-winding transformer, at least two energy storage inverters, and at least two rechargeable batteries. The number of secondary windings of the multi-winding transformer is greater than or equal to the number of energy storage inverters, and each energy storage inverter is connected to at least one secondary winding. The method specifically includes the following steps.

[0058] Step 102: When it is detected that a target rechargeable battery has a charging demand, determine the charging demand voltage of the target rechargeable battery and the input voltage of a target energy storage inverter connected to the target rechargeable battery, wherein the target rechargeable battery is any one or at least two of the at least two rechargeable batteries.

[0059] The structure diagram of a charging control system provided in the embodiment of this specification is as follows Figure 2 As shown, the charging control system is composed of a power supply device (grid) and a battery swap station. The charging system is deployed at the battery swap station. The charging system includes a multi-winding transformer, an energy storage inverter charging compartment and a battery compartment. The energy storage inverter charging compartment contains at least two energy storage inverters PCS (for the convenience of description, the energy storage inverter will be referred to as PCS in the future), and the battery compartment contains at least two rechargeable batteries. The number of secondary windings of the multi-winding transformer is greater than or equal to the number of PCSs, each PCS is connected to at least one secondary winding, and the secondary windings connected to each PCS are different, and each rechargeable battery is connected to one or at least two PCSs.

[0060] Specifically, one side of the primary winding of the multi-winding transformer is connected to the power grid (including but not limited to 10kV), and one side of the secondary winding is connected to the PCS charging warehouse. The secondary winding can be configured with different voltages according to the PCS AC input requirements.

[0061] The PCS charging compartment contains several groups of PCS charging modules. The PCS charging modules use three-phase two-level or three-phase three-level circuits for AC to DC rectification or DC to AC inversion. Each group of PCS charging modules is connected to at least one secondary winding on the AC side and a rechargeable battery on the DC side. The AC side of each group of PCS charging modules is connected to different secondary windings to achieve AC electrical isolation. When the battery is charging and discharging, mutual interference in insulation detection between each output circuit is eliminated.

[0062] Specifically, the target rechargeable battery is any one or at least two of the at least two rechargeable batteries included in the charging system; the PCS connected to the target rechargeable battery is the target energy storage converter, that is, the target PCS. When it is detected that the target rechargeable battery has a charging demand, the charging demand voltage of the target rechargeable battery and the input voltage of the target PCS connected to the target rechargeable battery can be determined. The charging demand voltage is used by the target PCS to perform AC-DC conversion on the AC power supply according to the voltage, and the input voltage is used by the multi-winding transformer to perform voltage conversion on the AC power supply according to the voltage.

[0063] In actual applications, battery swap stations can deploy a centralized control system, which can be used to communicate with the battery management system built into the battery box to obtain the status information and operating information of each battery, and determine whether the battery needs to be charged based on this information.

[0064] In addition, a remaining power threshold may be set for each rechargeable battery. For example, when the remaining power of the rechargeable battery is less than 50%, it is determined that there is a need for charging.

[0065] In addition, both the primary winding and the secondary winding of the multi-winding transformer can be three-phase windings.

[0066] It should be noted that Figure 2 The example in which a multi-winding transformer includes 5 secondary windings, an energy storage inverter charging warehouse includes 4 energy storage inverters PCS, and a battery swap station includes 4 rechargeable batteries is used for schematic illustration, but the specific number can be determined according to actual needs and is not limited here.

[0067] Step 104: converting the voltage of the AC power of the power supply device according to the input voltage by using the multi-winding transformer to obtain converted AC power.

[0068] Specifically, the power supply device may be a power grid.

[0069] Since the power supply provided by the power supply device is an AC power supply, and a DC power supply is required to charge the battery, the AC power supply needs to be converted from AC to DC when the power supply of the power supply device is used to charge the battery. In addition, since the input voltage of the converter used for AC-DC conversion, i.e., PCS, may be different for different PCSs, before the AC power supply is converted from AC to DC, the AC power supply can be converted from a voltage according to the input voltage of the PCS through a multi-winding transformer, so that the voltage of the converted AC power supply meets the input requirements of the PCS, and then the converted AC power supply is transmitted to the PCS for processing.

[0070] In practical applications, PCS can formulate different input and output voltage ranges according to the battery charging requirement voltage to achieve the maximum AC / DC power conversion efficiency.

[0071] In an optional implementation, converting the voltage of the AC power supply of the power supply device according to the input voltage by the multi-winding transformer includes:

[0072] Determining a target secondary winding connected to the target energy storage converter;

[0073] The AC power supply of the power supply device is converted into voltage according to the input voltage through the primary winding of the multi-winding transformer and the target secondary winding.

[0074] Specifically, Figure 2 As shown, since different PCSs are connected to different secondary windings, the secondary winding connected to the target PCS is the target secondary winding. In the embodiment of this specification, after determining the input voltage of the target PCS, the AC power supply of the power supply device can be converted according to the input voltage through the primary winding of the multi-winding transformer and the target secondary winding, so that the voltage of the converted AC power supply meets the input requirement of the target PCS.

[0075] In practical applications, the voltage conversion principle between the primary winding and the secondary winding of a multi-winding transformer is mainly based on the law of electromagnetic induction. The voltage conversion relationship formula between the primary three-phase winding and multiple sets of secondary three-phase windings is: U1 / U2=N1 / N2.

[0076] Among them, U1 and U2 represent the voltages of the primary three-phase winding and the secondary three-phase winding respectively, and N1 and N2 represent the number of turns of the primary three-phase winding and the secondary three-phase winding respectively.

[0077] Therefore, the relationship between the number of turns of the primary winding and the target secondary winding can be determined according to the voltage of the AC power supply of the power supply device and the input voltage of the target PCS, thereby realizing voltage conversion of the AC power supply.

[0078] Step 106: converting the converted AC power according to the required charging voltage through the target energy storage converter to obtain a corresponding DC power.

[0079] Specifically, since the PCS can perform AC / DC conversion of power supply, after the AC power supply of the power supply equipment is converted into voltage through a multi-winding transformer, the converted AC power supply can be converted into AC / DC according to the charging requirement voltage of the target rechargeable battery through the target PCS, thereby converting the AC power supply into DC power supply to charge the battery.

[0080] In an optional embodiment, the energy storage converter includes an AC / DC converter;

[0081] Correspondingly, the converting process of the converted AC power source according to the charging requirement voltage by the target energy storage converter includes:

[0082] The converted AC power source is converted according to the charging requirement voltage by an AC / DC converter included in the target energy storage inverter.

[0083] Specifically, an AC / DC converter is a device that converts alternating current into direct current. Since the energy storage inverter includes an AC / DC converter, the AC / DC conversion of the power supply is performed through the target PCS. Specifically, the converted AC power is converted into DC through the AC / DC converter included in the target PCS, thereby converting the AC power into DC power to charge the battery.

[0084] Step 108: Deliver the DC power to the target rechargeable battery to charge the target rechargeable battery.

[0085] Specifically, after the target PCS performs AC-DC conversion on the AC power according to the charging requirement voltage of the target rechargeable battery, the converted AC power can be transmitted to the target rechargeable battery to charge the target rechargeable battery.

[0086] The rechargeable battery described in the embodiments of this specification can be used in charging vehicles that support battery replacement or other charging equipment that supports battery replacement.

[0087] In an optional embodiment, the method further includes:

[0088] When it is detected that the target rechargeable battery has a discharge requirement, performing a discharge process on the target rechargeable battery;

[0089] The target energy storage converter converts the DC power output by the target rechargeable battery to obtain a corresponding AC power;

[0090] The multi-winding transformer converts the AC power into an AC power consistent with the power supply voltage of the power supply device and transmits the AC power to the power supply device.

[0091] Specifically, the power flow of PCS can be bidirectional. The power flow from the power source to the load (from the power supply device to the rechargeable battery) is called rectification, and the power flow from the load back to the power source (from the rechargeable battery to the power supply device) is called active inversion. In other words, in addition to converting the AC power of the power supply device into DC power to charge the battery, the PCS can also convert the DC power released by the rechargeable battery (the battery is used as energy storage) into AC power to provide power for other electrical loads or rechargeable batteries in adjacent locations.

[0092] Based on this, when the rechargeable battery in the charging system needs to be discharged, the DC power output by the rechargeable battery can be converted by the PCS connected to the rechargeable battery to obtain the corresponding AC power, and then the AC power is converted into an AC power consistent with the power supply voltage of the power supply device through a multi-winding transformer and transmitted to the power supply device.

[0093] In an optional implementation, the charging system further includes a DC / DC converter, and the DC / DC converter is electrically connected to the energy storage converter;

[0094] Accordingly, the method further comprises:

[0095] In response to a charging request from a device to be charged, determining a charging requirement voltage of the device to be charged, and determining an input voltage and an output voltage range of an energy storage converter connected to the DC / DC converter;

[0096] When it is determined that the charging requirement voltage of the device to be charged does not fall within the output voltage range, converting the DC power supply according to the charging requirement voltage of the device to be charged by the DC / DC converter to obtain a converted DC power supply;

[0097] The converted DC power is delivered to the device to be charged for charging.

[0098] Specifically, a DC / DC converter can convert a DC power source into a DC (or approximately DC) power source of a different voltage.

[0099] like Figure 2As shown, the charging system may also include a DC / DC converter, which adopts a buck-boost step-up and step-down circuit to charge a load whose voltage range of the charging requirement voltage exceeds the modulation range of the PCS module rectification. For the load beyond the modulation voltage range of the PCS module, the DC power supply output by the PCS module is converted into a DC power supply adapted to the charging requirement voltage of the load by the step-up and step-down circuit of the DC / DC converter, and then the converted DC power supply is delivered to the load for charging.

[0100] In the embodiments of this specification, the DC / DC converter may be connected to any one or at least two PCSs, wherein when the DC / DC converter is connected to at least two PCSs, each PCS connected to the DC / DC converter is connected in parallel.

[0101] In an optional implementation, the charging system further includes a charging gun, and the charging gun is electrically connected to the DC / DC converter;

[0102] Accordingly, the method further comprises:

[0103] Receiving a charging request sent by the device to be charged through the charging gun, wherein the charging request carries a charging requirement message;

[0104] The DC power source is converted by the DC / DC converter according to the charging requirement voltage carried in the charging requirement message to obtain a converted DC power source;

[0105] The converted DC power is transmitted to the charging gun, and the device to be charged is charged through the charging gun.

[0106] Specifically, in addition to replacing batteries at the battery swap station, the device to be charged can also be charged by plugging in the charging gun at the battery swap station.

[0107] The device to be charged can be an electric vehicle or other device that needs charging. Before charging, the device to be charged is physically connected to the battery swap station through a charging gun.

[0108] The charging requirement message can be a charging requirement message sent by the device to be charged to the battery swap station through the charging gun during the charging stage. The charging requirement message can carry the charging requirement information of the device to be charged (charging requirement current, charging requirement voltage, whether it is constant voltage charging or constant current charging, etc.), and is used for the DC / DC converter to perform DC conversion according to the charging requirement voltage. After the conversion is completed, the converted DC power can be transmitted to the charging gun, and the device to be charged is charged through the charging gun.

[0109] In actual applications, when there is redundant demand in the battery swap station, external vehicles can be charged through charging guns to meet the charging needs of external vehicles.

[0110] In an optional embodiment, the charging system further includes an in-station distribution box, which is electrically connected to the multi-winding transformer and is used to supply power to a centralized control module in the charging system.

[0111] Specifically, Figure 2 As shown, the charging system also includes an in-station distribution box, which is used to supply power to the centralized control system of the battery swap station (i.e., the centralized control module in the charging system), so that the centralized control system can centrally control the charging and discharging of the rechargeable batteries according to the power required by each battery compartment. Specifically, the centralized control system can send instructions to the main control board of the device to be charged to control each PCS to perform AC / DC conversion, so as to realize the charging and discharging of each device to be charged, thereby realizing the station-network interaction between the battery swap station and the power grid; in addition, the load balance of the battery swap station can also be achieved when the capacity of the multi-winding transformer is insufficient. Specifically, when the capacity of the multi-winding transformer is insufficient, the power of each PCS charging compartment can be controlled to ensure that the total power does not exceed the total power.

[0112] In addition, a schematic diagram of the structure of an energy storage converter charging bin provided in an embodiment of this specification is as follows: Figure 3 As shown in the figure, the AC incoming line from the multi-winding transformer enters two sets of switch cabinets respectively, and is connected to the PCS cabinet through the molded case circuit breaker, AC contactor, and circuit breaker in the switch cabinet, and the AC power is converted into DC power through the PCS. Then the DC power line enters the distribution cabinet and is connected to the DC load, and the control line enters the control cabinet and is connected to the control circuit of the load.

[0113] In addition, a circuit diagram of an energy storage converter provided in an embodiment of this specification is as follows: Figure 4 As shown in the figure, PCS realizes the smooth conversion from AC to DC or DC to AC through internal power electronic switch devices (D1, D3, D5, D2, D4, D6, resistor R, capacitor C and filter L, etc.) and corresponding control strategies.

[0114] On the one hand, the embodiments of this specification can effectively avoid interference in insulation detection between batteries through the electrical isolation of the secondary windings of the multi-winding transformer; on the other hand, the rechargeable batteries in the station can be used as energy storage units to cooperate with the battery swap station to provide external discharge function; thirdly, each secondary winding of the multi-winding transformer can be set with a different AC voltage, and multiple voltage platforms can be configured according to needs; in addition, the PCS charging module can also be configured according to the charging requirement voltage of the rechargeable battery to achieve the best energy conversion efficiency.

[0115] In the embodiment of this specification, when it is detected that the target rechargeable battery has a charging demand, the charging demand voltage of the target rechargeable battery and the input voltage of the target energy storage converter connected to the target rechargeable battery are determined, wherein the target rechargeable battery is any one or at least two of the at least two rechargeable batteries; the AC power supply of the power supply equipment is converted according to the input voltage by the multi-winding transformer to obtain the converted AC power supply; the converted AC power supply is converted according to the charging demand voltage by the target energy storage converter to obtain the corresponding DC power supply; the DC power supply is transmitted to the target rechargeable battery to charge the target rechargeable battery. Since the AC side of each group of PCS is connected to different secondary windings, AC electrical isolation is achieved. When the battery is charging and discharging, mutual interference of insulation detection between each output circuit is eliminated, which is beneficial to reduce power loss, thereby improving the utilization rate of power.

[0116] Corresponding to the above method embodiment, this specification also provides a charging control device embodiment, Figure 5 The structure diagram of a charging control device provided by an embodiment of the present specification is shown. The charging control device is applied to a charging system, the charging system includes a multi-winding transformer, at least two energy storage converters and at least two rechargeable batteries, the number of secondary windings of the multi-winding transformer is greater than or equal to the number of energy storage converters, each energy storage converter is connected to at least one secondary winding, such as Figure 5 As shown, the device comprises:

[0117] The determination module 502 is configured to determine the charging requirement voltage of the target rechargeable battery and the input voltage of the target energy storage converter connected to the target rechargeable battery when it is detected that the target rechargeable battery has a charging requirement, wherein the target rechargeable battery is any one or at least two of the at least two rechargeable batteries;

[0118] The first conversion module 504 is configured to perform voltage conversion on the AC power supply of the power supply device according to the input voltage through the multi-winding transformer to obtain a converted AC power supply;

[0119] A second conversion module 506 is configured to convert the converted AC power supply according to the charging requirement voltage through the target energy storage converter to obtain a corresponding DC power supply;

[0120] The charging module 508 is configured to transmit the DC power to the target rechargeable battery to charge the target rechargeable battery.

[0121] Optionally, the first conversion module 504 is further configured to:

[0122] Determining a target secondary winding connected to the target energy storage converter;

[0123] The AC power supply of the power supply device is converted into voltage according to the input voltage through the primary winding of the multi-winding transformer and the target secondary winding.

[0124] Optionally, the energy storage converter includes an AC / DC converter;

[0125] Accordingly, the second conversion module 506 is further configured to:

[0126] The converted AC power source is converted according to the charging requirement voltage by an AC / DC converter included in the target energy storage inverter.

[0127] Optionally, the charging system further comprises a DC / DC converter, and the DC / DC converter is electrically connected to the energy storage converter;

[0128] Accordingly, the charging control device further includes a processing module 510 configured to:

[0129] In response to a charging request from a device to be charged, determining a charging requirement voltage of the device to be charged, and determining an input voltage and an output voltage range of an energy storage converter connected to the DC / DC converter;

[0130] When it is determined that the charging requirement voltage of the device to be charged does not fall within the output voltage range, converting the DC power supply according to the charging requirement voltage of the device to be charged by the DC / DC converter to obtain a converted DC power supply;

[0131] The converted DC power is delivered to the device to be charged for charging.

[0132] Optionally, the charging system further comprises a charging gun, and the charging gun is electrically connected to the DC / DC converter;

[0133] Accordingly, the charging control device further includes a processing module 510, which is further configured to:

[0134] Receiving a charging request sent by the device to be charged through the charging gun, wherein the charging request carries a charging requirement message;

[0135] The DC power source is converted by the DCDC converter according to the charging requirement voltage carried in the charging requirement message to obtain a converted DC power source;

[0136] The converted DC power is transmitted to the charging gun, and the device to be charged is charged through the charging gun.

[0137] Optionally, the charging system further includes an in-station distribution box, which is electrically connected to the multi-winding transformer and is used to supply power to a centralized control module in the charging system.

[0138] Optionally, the charging control device further includes a processing module 510, which is further configured to:

[0139] When it is detected that the target rechargeable battery has a discharge requirement, performing a discharge process on the target rechargeable battery;

[0140] The target energy storage converter converts the DC power output by the target rechargeable battery to obtain a corresponding AC power;

[0141] The multi-winding transformer converts the AC power into an AC power consistent with the power supply voltage of the power supply device and transmits the AC power to the power supply device.

[0142] The above is a schematic scheme of a charging control device of this embodiment. It should be noted that the technical scheme of the charging control device and the technical scheme of the charging control method described above are of the same concept, and the details not described in detail in the technical scheme of the charging control device can be found in the description of the technical scheme of the charging control method described above.

[0143] Figure 6 The block diagram of a computing device 600 according to an embodiment of the present specification is shown. The components of the computing device 600 include but are not limited to a memory 610 and a processor 620. The processor 620 is connected to the memory 610 via a bus 630, and the database 650 is used to store data.

[0144] The computing device 600 also includes an access device 640 that enables the computing device 600 to communicate via one or more networks 660. Examples of these networks include a public switched telephone network (PSTN), a local area network (LAN), a wide area network (WAN), a personal area network (PAN), or a combination of communication networks such as the Internet. The access device 640 may include one or more of any type of network interface (e.g., a network interface card (NIC)) whether wired or wireless, such as an IEEE 802.11 wireless local area network (WLAN) wireless interface, a World Wide Interoperability for Microwave Access (Wi-MAX) interface, an Ethernet interface, a universal serial bus (USB) interface, a cellular network interface, a Bluetooth interface, a near field communication (NFC) interface, and the like.

[0145] In one embodiment of the present specification, the above components of the computing device 600 and Figure 6 Other components not shown in the figure may also be connected to each other, for example, via a bus. It should be understood that Figure 6The computing device structure block diagram shown is only for the purpose of illustration, and is not intended to limit the scope of this specification. Those skilled in the art can add or replace other components as needed.

[0146] The computing device 600 may be any type of stationary or mobile computing device, including a mobile computer or mobile computing device (e.g., a tablet computer, a personal digital assistant, a laptop computer, a notebook computer, a netbook, etc.), a mobile phone (e.g., a smart phone), a wearable computing device (e.g., a smart watch, smart glasses, etc.), or other types of mobile devices, or a stationary computing device such as a desktop computer or PC. The computing device 600 may also be a mobile or stationary server.

[0147] The processor 620 is used to execute the following computer executable instructions, which implement the steps of the above-mentioned charging control method when executed by the processor.

[0148] The above is a schematic scheme of a computing device of this embodiment. It should be noted that the technical scheme of the computing device and the technical scheme of the charging control method described above are of the same concept, and the details not described in detail in the technical scheme of the computing device can be found in the description of the technical scheme of the charging control method described above.

[0149] An embodiment of the present specification further provides a computer-readable storage medium storing computer-executable instructions, which can implement the steps of the above-mentioned charging control method when executed by a processor.

[0150] The above is a schematic scheme of a computer-readable storage medium of this embodiment. It should be noted that the technical scheme of the storage medium and the technical scheme of the charging control method described above are of the same concept, and the details not described in detail in the technical scheme of the storage medium can be referred to the description of the technical scheme of the charging control method described above.

[0151] An embodiment of the present specification further provides a computer program, wherein when the computer program is executed in a computer, the computer is caused to execute the steps of the above-mentioned charging control method.

[0152] The above is a schematic scheme of a computer program of this embodiment. It should be noted that the technical scheme of the computer program and the technical scheme of the charging control method described above are of the same concept, and the details not described in detail in the technical scheme of the computer program can be found in the description of the technical scheme of the charging control method described above.

[0153] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0154] The computer instructions include computer program codes, which may be in source code form, object code form, executable files or some intermediate forms, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0155] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of this specification are not limited by the order of the actions described, because according to the embodiments of this specification, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the embodiments of this specification.

[0156] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0157] The preferred embodiments of this specification disclosed above are only used to help explain this specification. The optional embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the embodiments of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the embodiments of this specification, so that technicians in the relevant technical field can well understand and use this specification. This specification is only limited by the claims and their full scope and equivalents.

Claims

1. A charging control method, applied to a charging system, the charging system comprising a multi-winding transformer, at least two energy storage converters and at least two rechargeable batteries, the number of secondary windings of the multi-winding transformer being greater than or equal to the number of energy storage converters, each energy storage converter being connected to at least one secondary winding, the method comprising: In the case of detecting that a target rechargeable battery has a charging demand, determining a charging demand voltage of the target rechargeable battery and an input voltage of a target energy storage converter connected to the target rechargeable battery, wherein the target rechargeable battery is any one or at least two of the at least two rechargeable batteries; Performing voltage conversion on the AC power supply of the power supply device according to the input voltage through the multi-winding transformer to obtain the converted AC power supply; The target energy storage converter converts the converted AC power supply according to the charging requirement voltage to obtain a corresponding DC power supply; The DC power supply is delivered to the target rechargeable battery to charge the target rechargeable battery.

2. The charging control method according to claim 1, wherein the multi-winding transformer performs voltage conversion on the AC power supply of the power supply device according to the input voltage, comprising: Determining a target secondary winding connected to the target energy storage converter; The AC power supply of the power supply device is converted into voltage according to the input voltage through the primary winding of the multi-winding transformer and the target secondary winding.

3. The charging control method according to claim 1, wherein the energy storage converter comprises an AC / DC converter; Correspondingly, the converting process of the converted AC power source according to the charging requirement voltage by the target energy storage converter includes: The converted AC power source is converted according to the charging requirement voltage by an AC / DC converter included in the target energy storage inverter.

4. The charging control method according to claim 1, wherein the charging system further comprises a DC / DC converter, and the DC / DC converter is electrically connected to the energy storage converter; Accordingly, the method further comprises: In response to a charging request from a device to be charged, determining a charging requirement voltage of the device to be charged, and determining an input voltage and an output voltage range of an energy storage converter connected to the DC / DC converter; When it is determined that the charging requirement voltage of the device to be charged does not fall within the output voltage range, converting the DC power supply according to the charging requirement voltage of the device to be charged by the DC / DC converter to obtain a converted DC power supply; The converted DC power is delivered to the device to be charged for charging.

5. The charging control method according to claim 4, wherein the charging system further comprises a charging gun, wherein the charging gun is electrically connected to the DC / DC converter; Accordingly, the method further comprises: Receiving a charging request sent by the device to be charged through the charging gun, wherein the charging request carries a charging requirement message; The DC power source is converted by the DC / DC converter according to the charging requirement voltage carried in the charging requirement message to obtain a converted DC power source; The converted DC power is transmitted to the charging gun, and the device to be charged is charged through the charging gun.

6. The charging control method according to claim 1, wherein the charging system further comprises an in-station distribution box, wherein the in-station distribution box is electrically connected to the multi-winding transformer and is used to supply power to a centralized control module in the charging system.

7. The charging control method according to claim 1, further comprising: When it is detected that the target rechargeable battery has a discharge requirement, performing a discharge process on the target rechargeable battery; The target energy storage converter converts the DC power output by the target rechargeable battery to obtain a corresponding AC power; The multi-winding transformer converts the AC power into an AC power consistent with the power supply voltage of the power supply device and transmits the AC power to the power supply device.

8. A charging control device, applied to a charging system, the charging system comprising a multi-winding transformer, at least two energy storage converters and at least two rechargeable batteries, the number of secondary windings of the multi-winding transformer being greater than or equal to the number of energy storage converters, each energy storage converter being connected to at least one secondary winding, the device comprising: A determination module is configured to determine the charging requirement voltage of the target rechargeable battery and the input voltage of the target energy storage converter connected to the target rechargeable battery when it is detected that the target rechargeable battery has a charging requirement, wherein the target rechargeable battery is any one or at least two of the at least two rechargeable batteries; A first conversion module is configured to perform voltage conversion on the AC power supply of the power supply device according to the input voltage through the multi-winding transformer to obtain a converted AC power supply; A second conversion module is configured to convert the converted AC power supply according to the charging requirement voltage through the target energy storage converter to obtain a corresponding DC power supply; The charging module is configured to transmit the DC power supply to the target rechargeable battery to charge the target rechargeable battery.

9. A computing device comprising: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the charging control method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions, when executed by a processor, implement the steps of the charging control method according to any one of claims 1 to 7.

Images