Electric quantity management method and system, and charging pile

Abstract

The invention discloses an electric quantity management method and system and a charging pile, and relates to the technical field of charging, the method is executed by the charging pile, and the method comprises the following steps: obtaining a power supply strategy, the power supply strategy is used for indicating a strategy for supplying power to the power receiving equipment or the energy storage battery based on the energy storage condition of the energy storage battery of the charging pile and the connection condition of the charging pile and the power receiving equipment; under the condition that the power supply strategy indicates to supply power to the power receiving equipment, supplying power to the power receiving equipment through at least one of first electric energy provided by a power supply connected with the charging pile and second electric energy provided by an energy storage battery; under the condition that the power supply strategy indicates that the energy storage battery is supplied with power, the energy storage battery is charged through first electric energy provided by the power source. The utilization rate of the charging pile can be ensured, peak load shifting is performed on the power grid, the load pressure of the power grid is relieved, and the problem of low charging efficiency caused by the fact that the charging pile is in a light-load working state for a long time is solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of charging technology, and in particular to a power management method, system, and charging pile. Background Art

[0002] A charging pile is a device that provides electrical energy to electric vehicles. It can convert electrical energy in the power grid into a form suitable for charging electric vehicle batteries and store it in the batteries of electric vehicles.

[0003] In the related art, in order to provide fast charging services for electric vehicles, the charging modules in the charging piles are mostly designed as high-power fast charging modules with high output power.

[0004] However, electric vehicles usually have a low-power charging demand, and the actual output current of the charging pile is small, and it is mostly in a light-load working state, resulting in low utilization of the charging module. When multiple charging piles are simultaneously supplying power to multiple electric vehicles, the grid load is large, and the energy that can be allocated to each charging pile is low, resulting in slow charging and low charging efficiency. Therefore, how to reduce the peak load of the grid and fill the valley and alleviate the power supply pressure is an urgent problem to be solved. Summary of the invention

[0005] The embodiments of the present application provide a power management method, system, and charging pile, which can improve the efficiency of power management. The technical solution is as follows:

[0006] In one aspect, a power management method is provided, the method comprising:

[0007] Acquire a power supply strategy, where the power supply strategy is used to indicate a strategy for supplying power to the powered device or the powered battery based on the energy storage status of the powered battery of the charging pile and the connection status between the charging pile and the powered device;

[0008] When the power supply strategy indicates that power is supplied to the powered device, power is supplied to the powered device by at least one of the first power provided by the power source connected to the charging pile and the second power provided by the energy storage battery;

[0009] When the power supply strategy indicates to supply power to the energy storage battery, the energy storage battery is charged by the first electric energy provided by the power source.

[0010] On the other hand, a power management system is provided, the system comprising a charge and discharge module, a control module and an energy storage module, the charge and discharge module being externally connected to a power source;

[0011] The control module is configured to obtain a power supply strategy, where the power supply strategy is used to indicate a strategy for supplying power to the powered device or the energy storage module based on the energy storage status of the energy storage module and the connection status of the powered device;

[0012] The charging and discharging module is configured to supply power to the powered device through at least one of the first power provided by the power source and the second power provided by the energy storage module when the power supply strategy indicates supplying power to the powered device;

[0013] The charging and discharging module is further configured to charge the energy storage module by using the first electric energy provided by the power supply when the power supply strategy indicates to supply power to the energy storage module.

[0014] On the other hand, a charging pile is provided, which includes a power management system.

[0015] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0016] Using the power supply and the energy storage module of the charging pile as the power source for powering the powered equipment can alleviate the pressure of the power supply to power multiple devices during peak hours of electricity consumption, increase the output power when charging the powered equipment, and improve the charging efficiency. When the energy storage module needs to be charged, the power supply can also charge the energy storage module. Compared with the method in the related art that only relies on the powered equipment to actively charge the energy storage module, the energy storage module can replenish electricity in time as a backup. When the energy storage module needs to discharge or charge, the charging pile must be used. When the power demand of the powered equipment is low, the utilization rate of the charging pile can still be guaranteed, alleviating the utilization rate problem caused by the charging pile being in a light-load working state for a long time. When the grid load is large, the energy storage module outputs its own stored electric energy to alleviate the pressure of the grid load and smooth the peak of the grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 is a schematic diagram of a power management system provided by an exemplary embodiment of the present application;

[0019] Figure 2 is a flow chart of a power management method provided by an exemplary embodiment of the present application;

[0020] Figure 3 is a flow chart of a power management method provided by another exemplary embodiment of the present application;

[0021] Figure 4 is a schematic diagram of a DC bus power management system provided by an exemplary embodiment of the present application;

[0022] Figure 5 is a schematic diagram of an AC bus power management system provided by an exemplary embodiment of the present application;

[0023] Figure 6 It is a schematic diagram of a charging pile provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0025] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0026] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application 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 herein refers to and includes any or all possible combinations of one or more associated listed items.

[0027] It should be noted that the information and data involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0028] It should be understood that, although the terms first, second, etc. may be used in the present application to describe various information, these 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 the present application, the first parameter may also be referred to as the second parameter, and similarly, the second parameter may also be referred to as the first parameter. 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".

[0029] As a device specifically designed to provide electrical energy for electric vehicles, the main function of a charging pile is to convert the electrical energy from the power grid into a specific form suitable for charging electric vehicle batteries and store it in the batteries of electric vehicles.

[0030] The charging pile includes a charging interface, which is mostly in the form of a charging gun. The user inserts the charging gun into the charging interface of the electric vehicle to establish a physical connection between the charging pile and the electric vehicle. The charging pile provides power to the electric vehicle through the charging interface for charging.

[0031] In the related technology, in order to provide faster charging services to electric vehicles, the charging module in the charging pile is usually designed as a high-power fast charging module with a higher rated output power. However, in actual application scenarios, electric vehicles often have lower power charging requirements, and the actual output power of the charging pile is much less than its rated output power, which causes the charging pile to be in a light-load working state for a long time. In the light-load working state, the charging efficiency of the charging module will be significantly reduced, and the charging module utilization rate cannot be fully utilized, and the charging efficiency is low.

[0032] The present application provides a power management system, which includes a charging and discharging module, a control module and an energy storage module. The charging and discharging module is externally connected to a power supply. The power management system is used to supply power to powered devices with charging needs, thereby improving charging efficiency and solving the problem of low utilization of the charging and discharging modules.

[0033] Exemplarily, this embodiment is described by taking the power management system as a management system based on a charging pile as an example, and the charging and discharging module, the control module and the energy storage module in the system can be regarded as modules in the charging pile.

[0034] like Figure 1 As shown, Figure 1 It is a schematic diagram of a power management system provided by an exemplary embodiment of the present application. The power management system 100 includes a charge and discharge module 110 , a control module 120 and an energy storage module 130 . The charge and discharge module 110 is externally connected to a power source 140 .

[0035] The power source 140 refers to a commercial power source, which provides power for the entire power management system 100 to maintain its own working mode, and provides power for the powered device 150 and the energy storage module 130 .

[0036] The control module 120 acquires a power supply strategy, which is used to indicate a strategy for supplying power to the powered device 150 or the power storage module 130 based on the energy storage status of the energy storage module 130 and the connection status of the powered device 150 .

[0037] That is, the control module 120 determines the power supply strategy after obtaining the energy storage status of the energy storage module 130 and the connection status of the powered device 150 and the power management system 100. The power supply strategy is used to indicate whether to supply power to the energy storage module 130 and the powered device 150, as well as the power distribution strategy when supplying power to the energy storage module 130 and the powered device 150 respectively.

[0038] When the power supply strategy indicates to supply power to the powered device 150 , the charge and discharge module 110 supplies power to the powered device 150 through at least one of the first power provided by the power source 140 and the second power provided by the energy storage module 130 .

[0039] When the power supply strategy indicates to supply power to the energy storage module 130 , the charge-discharge module 110 charges the energy storage module 130 through the first electric energy provided by the power source 140 .

[0040] Optionally, when the powered device 150 is connected, the control module 120 receives a charging instruction sent by the powered device 150 , where the charging instruction includes an output power requirement when supplying power to the powered device 150 .

[0041] The control module 120 obtains a power supply strategy for supplying power to the powered device 150 based on the energy storage status and output power requirement of the energy storage module 130 .

[0042] The output power requirement can reflect the degree of demand for power by the powered device 150. For example, if the powered device 150 is an electric vehicle, the lower the battery power is, the higher the demand for power by the powered device 150 is. The higher the output power requirement when the charging and discharging module 110 transmits power to the powered device 150 (that is, the actual output power of the charging and discharging module 110 is higher) is required to meet the needs of fast and efficient charging of the powered device 150.

[0043] Optionally, the power source of the powered device 150 in the power supply strategy includes at least one of the first power and the second power, including but not limited to the following situations.

[0044] (1) When the remaining energy storage of the energy storage module 130 reaches the first energy storage threshold, the control module 120 determines that the power supply strategy includes supplying power to the powered device 150 through the second electric energy provided by the energy storage module 130 .

[0045] The energy storage module 130 transmits the second electric energy to the charge-discharge module 110 based on the power supply strategy, and the charge-discharge module 110 supplies power to the powered device 150 through the second electric energy.

[0046] Exemplarily, the first energy storage threshold is 80%. When the remaining energy storage of the energy storage module 130 reaches 80% of its own storage capacity, the energy storage module 130 is used as a power source to supply power to the powered device 150 .

[0047] When the energy storage module 130 supplies power to the power receiving device 150, it needs to first transmit the second power to the charge and discharge module 110, and the charge and discharge module 110 transmits the second power to the power receiving device 150. A connection relationship is established between the power receiving device 150 and the charge and discharge module 110.

[0048] (2) When the remaining energy storage of the energy storage module 130 reaches the second energy storage threshold but does not reach the first energy storage threshold, the control module 120 determines that the power supply strategy includes supplying power to the powered device 150 through the first power provided by the power source 140 and the second power provided by the energy storage module 130.

[0049] The control module 120 determines a first discharge power ratio of the power source 140 and the energy storage module 130 to supply power to the powered device 150 based on the remaining stored energy of the energy storage module 130 , the output power of the power source 140 , and the output power requirement.

[0050] The energy storage module 130 transmits the second electric energy to the charge-discharge module 110 based on the first discharge power ratio; the charge-discharge module 110 supplies power to the power receiving device 150 through the first electric energy and the second electric energy based on the first discharge power ratio.

[0051] Exemplarily, the first energy storage threshold is 80%, and the second energy storage threshold is 20%. When the remaining energy storage of the energy storage module 130 is between 20% and 80% of its own storage capacity, the energy storage module 130 and the power supply 140 are used together as power sources to supply power to the powered device 150.

[0052] At this time, the energy storage module 130 transmits the second electric energy to the charge-discharge module 110 , and the power supply 140 also transmits the first electric energy to the charge-discharge module 110 , which then transmits the first electric energy to the power receiving device 150 .

[0053] For example, the remaining energy storage of the energy storage module 130 is 50%, corresponding to a maximum output power of 3kW, the output power of the power supply 140 is 7kW, and the output power requirement means that the power of the power receiving device 150 reaches 6kW when charging, then the first discharge power ratio of the power supply 140 and the energy storage module 130 to the power receiving device 150 is 3:7. The output power of the energy storage module 130 when transmitting the second electric energy to the charging and discharging module based on the first discharge power ratio is 3 / (3+7)*6=1.8kW, the output power of the power supply 140 when transmitting the first electric energy to the charging and discharging module based on the first discharge power ratio is 7 / (3+7)*6=4.2kW, and the output power of the charging and discharging module when supplying the power to the power receiving device 150 based on the output power requirement is 6kW.

[0054] (3) When the remaining energy storage of the energy storage module 130 does not reach the second energy storage threshold, the control module 120 determines that the power supply strategy includes supplying power to the powered device 150 through the first power provided by the power source 140 .

[0055] The charge-discharge module 110 receives the first electric energy transmitted by the power source 140 , and supplies power to the powered device 150 through the first electric energy.

[0056] Exemplarily, the second energy storage threshold is 20%. When the remaining energy storage of the energy storage module 130 is lower than 20% of its own storage capacity, the power source 140 is used as the sole power source to supply power to the powered device 150 .

[0057] Among them, since the remaining energy storage module 130 is too low, it means that the energy storage module 130 also needs to be charged. The control module 120 can decide whether to power the energy storage module 130 while powering the powered device 150 according to the charging demand of the powered device 150.

[0058] Optionally, in response to the output power of the power source 140 meeting the output power requirement, the control module 120 determines that the power supply strategy includes supplying power to the powered device 150 and the energy storage module 130 based on the first power provided by the power source 140 .

[0059] The control module 120 determines a second discharge power ratio for supplying power to the powered device 150 and the energy storage module 130 through the first electric energy based on the remaining stored energy of the energy storage module 130 , the output power of the power source 140 , and the output power requirement.

[0060] The charge-discharge module 110 supplies power to the power receiving device 150 and the energy storage module 130 through the first electric energy based on the second discharge power ratio.

[0061] Exemplarily, the output power of the power supply 140 is 10kW, the output power requirement means that the power of the powered device 150 reaches 6kW when charging, and the output power of the power supply 140 meets the output power requirement. Then, the power supply strategy is determined as the power supply 140 simultaneously supplies power to the energy storage module 130 and the powered device 150.

[0062] For example, the remaining energy storage of the energy storage module 130 is 10% of its own storage capacity, and the corresponding charging function requirement is 4kW, then the second discharge power ratio is 4:6, the power supply 140 transmits the first electric energy to the charge and discharge module 110 with an output power of 10kW, and the charge and discharge module 110 transmits the first electric energy to the energy storage module 130 with an output power of 4kW and to the power receiving device 150 with an output power of 6kW.

[0063] In some embodiments, when the power management system 100 is not connected to the powered device 150 , in order to improve the utilization rate of the charging and discharging module, the power supply 140 can spontaneously charge the energy storage module 130 as a backup.

[0064] When the powered device 150 is not connected, the control module 120 obtains the load information of the power source 140 , and the load information of the power source 140 can indicate the working condition of the power source 140 when supplying power to other devices at the current moment.

[0065] For example, the power supply 140 is connected to multiple system power supplies, and can simultaneously supply power to at least one of the multiple systems, and allocate corresponding output power according to the power demand of each system.

[0066] When the power supply 140 provides power to more than a certain number of systems at the same time, it means that the power supply 140 is in the peak period of power consumption. The power supply 140 gives priority to providing power to the system that needs to power the powered device 150, so that the system powers the powered device 150 and temporarily stops charging the energy storage module 130 of the system. When the power supply 140 is in the non-peak period of power consumption, the power supply 140 can charge the energy storage module 130 of the system while powering the powered device 150.

[0067] When the load information of the power source 140 indicates that the power source 140 can provide the first power to the charge and discharge module 110, determining the power supply strategy includes supplying power to the energy storage module 130 based on the charge and discharge module 110. The charge and discharge module 110 charges the energy storage module 130 with the first power provided by the power source 140.

[0068] In some embodiments, the power management system 100 is a bidirectional charging system, that is, it can both discharge power to the powered device 150 and receive power actively transmitted by the powered device 150 .

[0069] When the powered device 150 is connected, the control module 120 receives a discharge instruction sent by the powered device 150 , which includes a target charge amount for the powered device 150 to charge the energy storage module 130 , and acquires a power supply strategy based on the energy storage status of the energy storage module 130 and the target charge amount.

[0070] That is, when the powered device 150 actively discharges to the power management system 100 , if the energy storage module 130 still has residual capacity, the power transmitted by the powered device 150 can be received through the energy storage module 130 .

[0071] When the capacity of the energy storage module 130 is greater than or equal to the target charge amount, the charge-discharge module 110 charges the energy storage module 130 based on the target charge amount.

[0072] Exemplarily, the target charging amount refers to the range of change in the battery power of the powered device 150. The battery power of the powered device 150 at the current moment is 90%, and the target charging amount is 10%, indicating that the powered device 150 expects to transfer 10% of the battery power to the energy storage module 130. After the power is transferred, the battery power is 90%-10%=80%.

[0073] After receiving the discharge instruction, the control module 120 converts the target charge amount based on the target charge amount indicated by the discharge instruction, and determines the capacity occupied by the target charge amount in the energy storage module 130 .

[0074] For example, the discharge instruction also includes the first capacity of the powered device 150, and the energy storage module 130 has a corresponding second capacity. The ratio of the first capacity to the second capacity is 1:3, then the second capacity is 3 times the first capacity, and the maximum power capacity of the energy storage module 130 can store 3 times the maximum storage capacity of the battery of the powered device 150.

[0075] The target charge amount is converted into 3.33% of the capacity occupied by the energy storage module 130, wherein the remaining capacity of the energy storage module 130 is 40%, which is greater than the capacity occupied by the target charge amount. Then, the charge-discharge module 110 can transmit the electric energy of the powered device 150 to the energy storage module 130, and stop transmitting when the transmission amount reaches the target charge amount.

[0076] Then, after receiving the electric energy transmitted by the powered device 150, the remaining capacity of the energy storage module is 40%-

[0077] 3.33%=36.67%, that is, the remaining energy storage of the energy storage module is 63.33%.

[0078] In some embodiments, when the power supply 140 connected to the power management system 100 is unable to provide power to the power management system 100 (that is, a power outage occurs), the energy storage module 130 can serve as an alternative power supply to maintain the working state of the power management system 100, and serve as the only power supply to the powered device 150 that has charging needs.

[0079] Optionally, when the power supply 140 cannot provide the first electric energy to the power management system 100 and the energy storage module 130 has residual stored energy, the energy storage module 130 provides the second electric energy to the control module 120 .

[0080] When the powered device 150 is connected, the control module 120 receives a charging instruction sent by the powered device 150 , and determines a power supply strategy based on the charging instruction to supply power to the powered device 150 based on the energy storage module 130 .

[0081] The energy storage module 130 supplies power to the powered device 150 through the second power. When supplying power to the powered device 150 , the energy storage module 130 still needs to transmit the second power to the charging and discharging module 110 , which then transmits the second power to the powered device 150 .

[0082] In summary, the power management system provided by the present application uses the power supply and the energy storage module as the power source for supplying power to the powered equipment, which can alleviate the pressure of the power supply to supply power to multiple devices during peak power consumption, increase the output power when charging the powered equipment, and improve the charging efficiency of the power management system. When the energy storage module has a charging demand, the power supply can also charge the energy storage module. Compared with the method in the related art that only relies on the powered equipment to actively charge the energy storage module, the energy storage module can replenish power in time as a backup. When the energy storage module has a discharge or charging demand, it needs to pass through the charging and discharging module to realize power transmission. When the power demand of the powered equipment is low, the utilization rate of the charging and discharging module can still be guaranteed, alleviating the problem of low charging efficiency caused by the charging and discharging module being in a light-load working state for a long time.

[0083] The power management system includes a DC bus power management system and an AC bus power management system. The DC bus power management system uses a DC bus to transmit electricity. First, the AC power output by the power supply is converted into DC power, and then the DC power is transmitted to various parts of the power management system; the AC bus power management system uses an AC bus to transmit electricity. First, the AC power output by the power supply is transmitted to various parts of the power management system, and then the AC power is converted into DC power when the power supply is used.

[0084] Figure 2 is a flow chart of a power management method provided by an exemplary embodiment of the present application, which is executed by a charging pile, and the charging pile includes: Figure 1 The power management system shown in the figure comprises the following steps.

[0085] Step 210: Obtain a power supply strategy.

[0086] The power supply strategy is used to indicate a strategy for supplying power to the powered device or the energy storage battery based on the energy storage status of the energy storage battery of the charging pile and the connection status between the charging pile and the powered device.

[0087] The charging pile is a V2G (Vehicle-to-Grid) charging pile, which is a charging device that can perform bidirectional energy flow with a powered device. This embodiment is described by taking an electric vehicle as an example. The charging pile can transmit electric energy to the electric vehicle for charging, and can also receive electric energy actively transmitted by the electric vehicle and store it in the charging pile.

[0088] The power supply strategy includes at least one of the following power supply situations: (1) the charging pile transmits the electric energy from the power grid to the power receiving device; (2) the charging pile receives the electric energy transmitted by the power receiving device and stores it in the energy storage battery; (3) the charging pile transmits the electric energy from the power grid to the energy storage battery.

[0089] Among them, the power supply strategy is determined by the charging pile based on whether the powered device is connected to the charging pile, the operating instructions sent by the powered device, the remaining energy storage of the energy storage battery, etc.

[0090] Step 220: When the power supply strategy indicates to supply power to the powered device, the powered device is supplied with power through at least one of the first power provided by the power source connected to the charging pile and the second power provided by the energy storage battery.

[0091] The power source connected to the charging pile (that is, the electricity in the power grid) can be used as the power source for the energy storage battery and the powered equipment, and the electricity in the energy storage battery can also be used as the power source for the powered equipment.

[0092] Optionally, situations in which the power supply strategy indicates that power is supplied to the powered device include the following.

[0093] (1) The powered device is powered only by the second electric energy provided by the energy storage battery.

[0094] The powered device sends a charging instruction to the charging pile, and the remaining energy stored in the energy storage battery of the charging pile can provide the total amount of electric energy required by the powered device.

[0095] For example, when the remaining energy storage of the energy storage battery reaches 80% of its own capacity, the power supply strategy is determined to supply power to the powered device only through the second electric energy provided by the energy storage battery.

[0096] (2) The energy storage battery and the power supply jointly supply power to the powered equipment.

[0097] The powered device sends a charging instruction to the charging pile, and the remaining energy stored in the energy storage battery of the charging pile can provide part of the electrical energy required by the powered device.

[0098] For example, when the remaining energy storage of the energy storage battery is between 20% and 80% of its own capacity, the power supply strategy is determined to supply power to the powered device through both the first power provided by the power source and the second power provided by the energy storage battery.

[0099] (3) The power supply to the powered equipment is only from the power supply.

[0100] The powered device sends a charging instruction to the charging pile, but the remaining energy in the energy storage battery of the charging pile does not meet the energy requirement of the charging pile itself.

[0101] For example, when the remaining energy storage of the energy storage battery is less than 20% of its own capacity, the power supply strategy is determined to supply power to the powered device only through the first electric energy provided by the power source.

[0102] Among them, since the remaining energy storage of the energy storage battery is low, the energy storage battery also needs to be charged. It can be determined whether to power the energy storage battery while powering the powered equipment based on the actual output capacity of the power source.

[0103] For example, the powered device sends a charging instruction to the charging pile, and the charging instruction includes an output power requirement of the powered device when charging.

[0104] When the output power of the power source is greater than the output power requirement of the powered device, the powered device and the energy storage battery are powered by the first electric energy provided by the power source while meeting the output power requirement of the powered device.

[0105] When the output power of the power source is less than or equal to the output power requirement of the powered device, the powered device is powered only by the first electric energy provided by the power source.

[0106] Step 230: When the power supply strategy indicates to supply power to the energy storage battery, the energy storage battery is charged by the first electric energy provided by the power supply.

[0107] The energy storage battery in the charging pile can be used as a source of electric energy for supplying power to the power receiving device, and can also be used as a container to receive the first electric energy from the power source and the electric energy from the power receiving device.

[0108] Optionally, the power supply strategy indicates that power is supplied to the energy storage battery in the following situations.

[0109] (1) The powered device is powered only by the power provided by the powered device.

[0110] The powered device sends a discharge command to the charging pile, and the energy storage battery of the charging pile still has the capacity to receive part or all of the energy transmitted by the powered device.

[0111] For example, when the remaining energy storage of the energy storage battery is 80% of its own capacity, and the maximum power supply that the powered device expects to provide to the energy storage battery is 20% of the energy storage battery's own capacity, the power supply strategy is determined to supply power to the energy storage battery only with the power provided by the powered device.

[0112] (2) The energy storage battery is powered only by the power supply.

[0113] When the charging pile is not connected to a power receiving device and the remaining energy storage battery in the charging pile is low, it can receive the energy transmitted by the power source.

[0114] For example, when the remaining energy storage of the energy storage battery is less than 20% of its own capacity, and the charging pile is not connected to a powered device, and there is no need to supply power to the powered device, the power supply strategy is determined to supply power to the energy storage battery only through the first electric energy provided by the power power supply.

[0115] In some embodiments, the energy storage battery and the power power supply may also jointly supply power to the powered device. The charging pile preferentially supplies power to the energy storage battery through the electric energy provided by the powered device when the powered device actively supplies power. When the powered device is powered, if the remaining energy storage battery is still lower than a preset threshold, the energy storage battery is powered by the first electric energy provided by the power power supply.

[0116] In summary, the power management method provided by the present application uses the power supply and the energy storage battery in the charging pile as the power source for powering the powered device, which can alleviate the pressure of the power supply to power multiple devices during peak power consumption, increase the output power when charging the powered device, and improve the charging efficiency of the charging pile when charging the powered device. When the energy storage battery needs to be charged, the power supply can also charge the energy storage battery. Compared with the method in the related art that only relies on the powered device to actively charge the energy storage battery, the energy storage battery can be replenished in time as a backup. The charging pile can supply power to the outside world and receive external power at the same time, which improves the utilization rate of the charging pile.

[0117] Figure 3 is a flow chart of a power management method provided by another exemplary embodiment of the present application, the method is executed by a charging pile, and the charging pile includes: Figure 1 The power management system shown in the figure comprises the following steps.

[0118] S310: Determine the power management type based on the connection status between the charging pile and the powered device.

[0119] The power management types include: (1) when connected to a powered device, receiving a charging instruction from the powered device and charging the powered device; (2) when connected to a powered device, receiving a discharging instruction from the powered device and receiving the electric energy transmitted by the powered device; (3) when not connected to a powered device, managing the power of the charging pile itself.

[0120] S320: When the charging pile is connected to the powered device and a charging instruction from the powered device is received, a power supply strategy for supplying power to the powered device is acquired based on the energy storage status of the energy storage battery.

[0121] Among them, the step S320 can be expressed as the following steps S321 to S324.

[0122] S321: When the remaining energy storage of the energy storage battery reaches a first energy storage threshold, determining a power supply strategy includes supplying power to a powered device through second electric energy provided by the energy storage battery.

[0123] The second electric energy provided by the energy storage battery is transmitted to the powered device through the charging and discharging module of the charging pile.

[0124] Exemplarily, the first energy storage threshold is 80% of the energy storage battery's own capacity, and the remaining energy storage of the energy storage battery is 90% of its own capacity. When the first energy storage threshold is reached, the energy storage battery has sufficient power, and power is supplied to the powered device only through the energy storage battery.

[0125] S322: When the remaining energy storage of the energy storage battery reaches a second energy storage threshold but does not reach the first energy storage threshold, determine a power supply strategy including supplying power to the powered device through first electric energy provided by the power source and second electric energy provided by the energy storage battery.

[0126] Exemplarily, the first energy storage threshold is 80% of the energy storage battery's own capacity, the second energy storage threshold is 20% of the energy storage battery's own capacity, and the remaining energy storage of the energy storage battery is 50% of its own capacity, which is between the first energy storage threshold and the second energy storage threshold. Power is supplied to the powered device simultaneously through the energy storage battery and the power supply.

[0127] Optionally, a first discharge power ratio of the power source and the energy storage battery to supply power to the powered device is determined based on the remaining stored energy of the energy storage battery, the output power of the power source, and the output power requirement.

[0128] The first electric energy provided by the power source and the second electric energy provided by the energy storage battery are received by the charge and discharge module of the charging pile, wherein the first electric energy provided by the power source and the second electric energy provided by the energy storage battery meet a first discharge power ratio.

[0129] For example, the remaining energy storage of the energy storage battery is 50%, the maximum charging power it can provide is 10kW, the output power of the power supply is 20kW, and the output power requirement of the powered device is 6kW. The first discharge power ratio of the power supply and the energy storage battery to the powered device is determined to be 1:2, that is, the output power of the power supply is 4kW, and the output power of the energy storage battery is 2kW.

[0130] The first electric energy provided by the power source and the second electric energy provided by the energy storage battery are transmitted to the power receiving device through the charge and discharge module, and the power output of the charge and discharge module is 6kW.

[0131] S323: When the remaining energy storage of the energy storage battery does not reach the second energy storage threshold, determining a power supply strategy includes supplying power to the powered device through the first electric energy provided by the power source.

[0132] The first electric energy provided by the power source is transmitted to the power receiving device through the charging and discharging module of the charging pile.

[0133] Exemplarily, the second energy storage threshold is 20% of the energy storage battery's own capacity, and the remaining energy storage of the energy storage battery is 10% of its own capacity, which is lower than the second energy storage threshold, and power is supplied to the powered device through the power supply at the same time.

[0134] Optionally, in response to the output power of the power source meeting the output power requirement, determining the power supply strategy includes supplying power to the powered device and the energy storage battery based on the first electric energy provided by the power source.

[0135] A second discharge power ratio for supplying power to the powered device and the energy storage battery through the first electric energy is determined based on the remaining stored energy of the energy storage battery, the output power of the power source, and the output power requirement.

[0136] For example, the remaining energy storage of the energy storage battery is 10%, the required charging power is 10kW, the output power of the power supply is 20kW, and the output power requirement of the powered device is 6kW. The second discharge power ratio of the power supply to the energy storage battery and the powered device is determined to be 5:3, that is, the output power of the power supply is (10+6=16)kW, the output power to the energy storage battery is 10kW, and the output power to the powered device is 6kW.

[0137] The first electric energy provided by the power source and the second electric energy provided by the energy storage battery are transmitted to the power receiving device through the charge and discharge module, and the power output of the charge and discharge module is 16kW.

[0138] The first electric energy provided by the power source is transmitted to the power receiving device and the energy storage battery through the charge and discharge module of the charging pile based on the second discharge power ratio.

[0139] S324: When the power source cannot provide the first electric energy to the charging pile and the energy storage battery has residual energy, determine the power supply strategy to supply power to the powered device based on the energy storage battery.

[0140] When the power source cannot provide the first electric energy to the charging pile and the energy storage battery has residual energy, in response to the charging pile being connected to the powered device, a charging instruction sent by the powered device is received.

[0141] The power supply strategy is determined based on the charging instruction to supply power to the powered device based on the energy storage battery, and the powered device is supplied with power by the second electric energy provided by the energy storage battery.

[0142] If the remaining energy storage of the energy storage battery can meet the power requirement indicated by the charging instruction, the energy storage battery is directly used to supply power to the powered device until the power requirement of the powered device is met; if the remaining energy storage of the energy storage battery cannot fully meet the power requirement indicated by the charging instruction, the energy storage battery is used to supply power to the powered device until the remaining energy storage of the energy storage battery cannot be reduced (for example, the minimum power of the energy storage battery is set to 1%. If the power of the energy storage battery is reduced to 1% after transmitting power and still does not meet the power requirement of the powered device, charging is stopped to ensure the battery health of the energy storage battery).

[0143] It is worth noting that step S321 to step S324 are in parallel, and the order of executing the above four steps can be arbitrary.

[0144] S330: When the charging pile is connected to the powered device and a discharge instruction from the powered device is received, a power supply strategy for supplying power to the energy storage battery is acquired based on the energy storage status of the energy storage battery.

[0145] When a power receiving device is connected, a discharge instruction sent by the power receiving device is received, where the discharge instruction includes a target charge amount for the power receiving device to charge the energy storage battery.

[0146] The power supply strategy is obtained based on the energy storage status of the energy storage battery and the target charge amount.

[0147] When the capacity of the energy storage battery is greater than or equal to the target charge amount, the electric energy provided by the power receiving device is transmitted to the energy storage battery based on the target charge amount through the charge and discharge module of the charging pile.

[0148] Exemplarily, based on the target charge amount indicated by the discharge instruction, the target charge amount is converted to determine the capacity occupied by the target charge amount in the energy storage battery.

[0149] For example, the discharge instruction also includes the first capacity of the powered device, the energy storage battery has a corresponding second capacity, the ratio of the first capacity to the second capacity is 1:3, then the second capacity is 3 times the first capacity, and the maximum power capacity of the energy storage battery can store 3 times the maximum storage capacity of the battery of the powered device.

[0150] The target charge amount is converted into 3.33% of the capacity of the energy storage battery, of which the remaining capacity of the energy storage battery is 40%, which is greater than the capacity occupied by the target charge amount. The charging and discharging module can transmit the electrical energy of the powered device to the energy storage battery and stop transmitting when the transmission amount reaches the target charge amount.

[0151] Then, after receiving the electric energy transmitted by the powered device, the remaining capacity of the energy storage module is 40%-3.33%=36.67%, that is, the remaining energy storage of the energy storage module is 63.33%.

[0152] S340, when the charging pile is not connected to the powered device, a power supply strategy for power management of the charging pile itself is obtained based on the energy storage status of the energy storage battery.

[0153] In the case where the power receiving device is not connected, the power supply load information is obtained. The power supply load information is obtained from the power supply connected to the charging pile, which can reflect whether the power supply is in the peak power supply period (that is, supplying power to devices or other charging piles exceeding the number threshold at the current moment). If the power supply is in the peak power supply period at this time, it may not be able to supply power to the charging pile, or the output power when supplying power to the charging pile is limited. If the power supply is not in the peak power supply period at this time, the power supply can supply power to the charging pile to provide the first electric energy.

[0154] When the power supply load information indicates that the power supply can provide the first electric energy to the charging and discharging module of the charging pile, determining the power supply strategy includes supplying power to the energy storage battery based on the first electric energy provided by the power supply, and transmitting the first electric energy provided by the power supply to the energy storage battery through the charging and discharging module.

[0155] It is worth noting that step S320 to step S340 are in parallel, and the order of executing the above four steps can be arbitrary.

[0156] S350: Power at least one of the powered device and the energy storage battery based on the power supply strategy.

[0157] Among them, when supplying power to the power receiving equipment and the energy storage battery, the current transmission needs to pass through the charging and discharging module in the charging pile.

[0158] In summary, the power management method provided by the present application uses the power supply and the energy storage battery in the charging pile as the power source for powering the powered device, which can alleviate the pressure of the power supply to power multiple devices during peak power consumption, increase the output power when charging the powered device, and improve the charging efficiency of the charging pile when charging the powered device. When the energy storage battery needs to be charged, the power supply can also charge the energy storage battery. Compared with the method in the related art that only relies on the powered device to actively charge the energy storage battery, the energy storage battery can be replenished in time as a backup. The charging pile can supply power to the outside world and receive external power at the same time, which improves the utilization rate of the charging pile.

[0159] Figure 4 It is a schematic diagram of a DC bus power management system provided by an exemplary embodiment of the present application.

[0160] The DC bus power management system 400 includes a charge and discharge module 410 , a control module 420 and an energy storage module 430 . The charge and discharge module 410 is externally connected to a power source 440 .

[0161] Among them, the charging and discharging module 410 includes a DC-to-DC discharging module 411 and a charging interface 412 ; the control module 420 includes an energy storage charging management module 421 and a control power supply 422 ; the energy storage module 430 includes an AC-to-DC module 431 , a DC-to-DC energy storage module 432 , and an energy storage battery 433 .

[0162] The energy storage charging management module 421 in the control module 420 is used to obtain the power supply strategy, and the control power supply 422 is connected to the power supply 440 to obtain the electric energy required to maintain the normal operation of the DC bus power management system 400. The AC to DC module 431 in the energy storage module 430 is connected to the power supply 440. The power provided by the power supply 440 is AC. The AC to DC module 431 is used to convert AC into DC, and transmit the DC to the DC to DC energy storage module 432 and the DC to DC discharge module 411 respectively. The DC to DC energy storage module 432 transmits DC to the energy storage battery 433, and the energy storage battery 433 stores energy as the second electric energy when supplying power to the power receiving device. The DC to DC discharge module 411 transmits DC to the power receiving device through the charging interface 412.

[0163] The electrical connection relationship between the modules in the DC bus power management system 400 is as follows: the DC-to-DC discharge module 411 is electrically connected to the charging interface 412; the energy storage charging management module 421 is electrically connected to the control power supply 422; the AC-to-DC module 431 is electrically connected to the DC-to-DC energy storage module 432; the DC-to-DC energy storage module 432 is electrically connected to the energy storage battery 433; the AC-to-DC module 431 is electrically connected to the DC-to-DC discharge module 411; the DC-to-DC energy storage module 432 is electrically connected to the DC-to-DC discharge module 411; the power power supply 440 is electrically connected to the control power supply 422; the power power supply 440 is electrically connected to the AC-to-DC module 431.

[0164] The communication connection relationship between the modules in the DC bus power management system 400 is as follows: a communication connection is established between the energy storage charging management module 421 and the AC to DC module 431; a communication connection is established between the energy storage charging management module 421 and the DC to DC discharge module 411; a communication connection is established between the energy storage charging management module 421 and the charging interface 412; a communication connection is established between the energy storage charging management module 421 and the DC to DC energy storage module 432; and a communication connection is established between the energy storage charging management module 421 and the energy storage battery 433.

[0165] In some embodiments, the control module 420 also includes a screen interaction module 423 , a heat dissipation fan module 424 , and an electric meter measurement module 425 .

[0166] The screen interaction module 423 is used to receive operation instructions and send the operation instructions to the energy storage charging management module 421 in the control module 420, and the energy storage charging management module 421 obtains the power supply strategy corresponding to the operation instructions. The heat dissipation fan module 424 is used to dissipate the heat of each module in the DC bus power management system 400 to avoid failures caused by the heat generated by each module during operation. The electric meter measurement module 425 is used to monitor the costs and total amount of power transmission generated when the DC bus power management system 400 and the powered device are transmitting power.

[0167] For example, the DC bus power management system 400 is implemented as a charging pile, and the power receiving device is an electric vehicle. The screen interaction module 423 is used to provide a medium for interaction between the user and the charging pile. The user driving the electric vehicle can input instructions through the screen interaction module 423 to obtain power from the charging pile to charge the electric vehicle, or transmit the power in the electric vehicle to the charging pile.

[0168] Among them, during the charging process of the electric vehicle, the electric meter measurement module 425 will monitor the fees generated by the process that need to be paid by the user and the total amount of power transferred (specifically reflected in the increase in the battery power of the electric vehicle); during the discharge of the electric vehicle to the charging pile, the electric meter measurement module 425 will monitor the fees generated by the process that the user can obtain and the total amount of power transferred (specifically reflected in the decrease in the battery power of the electric vehicle).

[0169] Optionally, the energy storage charging management module 421 in the control module 420 is used to obtain a power supply strategy, and the types of power supply strategies include the following.

[0170] 1. When the power supply strategy indicates to supply power to the energy storage module 430 , the AC-DC module 431 transmits the first electric energy provided by the power source 440 to the DC-DC energy storage module 432 ; the DC-DC energy storage module 432 transmits the first electric energy to the energy storage battery 433 .

[0171] 1.1 For example, there is a communication connection between the control module 420 and the charging interface 412. When the charging interface 412 is connected to the powered device, the charging interface 412 forwards the charging instruction sent by the powered device to the control module 420, and the control module 420 obtains the transmission power requirement of the powered device based on the charging instruction. There is a communication connection between the control module 420 and the energy storage module 430, and the remaining energy storage of the energy storage battery 433 is obtained through the communication connection.

[0172] If the remaining energy storage of the energy storage battery 433 is lower than the second energy storage threshold (e.g., 40% of the capacity of the energy storage battery 433 itself), and the output power of the power supply 440 meets the transmission power requirement of the powered device, the control module 420 determines the power supply strategy as: powering the energy storage module 430 and the powered device at the same time through the power supply 440.

[0173] At this time, the current transmission path is as follows: the power supply 440 transmits the first electric energy to the AC-DC module 431, which is respectively transmitted to the DC-DC energy storage module 432 and the DC-DC discharge module 411, and the DC-DC energy storage module 432 transmits the first electric energy to the energy storage battery 433 to supply power to the energy storage battery 433. The DC-DC discharge module 411 transmits the first electric energy to the powered device through the charging interface 412 to supply power to the powered device.

[0174] During this process, the output power of the DC-to-DC discharge module 411 meets the transmission power requirement of the powered device, and the output power transmitted by the DC-to-DC energy storage module 432 to the energy storage module 430 is determined based on the difference between the transmission power requirement of the powered device and the output power of the power supply 440.

[0175] 1.2 For example, there is a communication connection between the control module 420 and the charging interface 412. When the charging interface 412 is not connected to the powered device, it means that the DC bus power management system 400 does not need to supply power to any powered device. There is a communication connection between the control module 420 and the energy storage module 430, and the remaining energy storage of the energy storage battery 433 is obtained through the communication connection.

[0176] If the remaining energy storage of the energy storage battery 433 is lower than the second energy storage threshold (eg, 40% of the capacity of the energy storage battery 433 ), the control module 420 determines the power supply strategy as: supplying power to the energy storage module 430 through the power supply 440 .

[0177] At this time, the current transmission path is as follows: the power supply 440 transmits the first electrical energy to the AC-DC module 431, which is then transmitted to the DC-DC energy storage module 432, and the DC-DC energy storage module 432 transmits the first electrical energy to the energy storage battery 433 to supply power to the energy storage battery 433.

[0178] In this process, the output power transmitted by the DC-to-DC energy storage module 432 to the energy storage battery 433 is determined based on the output power of the power source 440 .

[0179] In some embodiments, when the DC bus power management system 400 is connected to a powered device, if the powered device actively initiates a discharge instruction to the control module 420, that is, when the powered device actively supplies power to the energy storage module 430, the power supply strategy is determined based on the discharge instruction and the remaining energy storage module 430.

[0180] For example, when the energy storage battery 433 has the capacity to receive the electric energy actively transmitted by the powered device, the current transmission path is as follows: the powered device transmits the electric energy to the DC-to-DC discharge module 411 through the charging interface 412, the DC-to-DC discharge module 411 transmits the electric energy to the DC-to-DC energy storage module 432, and the DC-to-DC energy storage module 432 transmits the electric energy to the energy storage battery 433 to supply power to the energy storage battery 433.

[0181] 2. When the power supply strategy includes supplying power to the powered device through the first electric energy provided by the power power supply 440, the AC-DC module 431 transmits the first electric energy provided by the power power supply 440 to the DC-DC discharge module 411; the DC-DC discharge module 411 transmits the first electric energy to the powered device through the charging interface 412, wherein the powered device and the charging interface 412 are electrically connected.

[0182] Exemplarily, there is a communication connection between the control module 420 and the charging interface 412. When the charging interface 412 is connected to the powered device, the charging interface 412 forwards the charging instruction sent by the powered device to the control module 420, and the control module 420 obtains the transmission power requirement of the powered device based on the charging instruction. There is a communication connection between the control module 420 and the energy storage module 430, and the remaining energy storage of the energy storage battery 433 is obtained through the communication connection.

[0183] 2.1 If the remaining energy storage of the energy storage battery 433 reaches the second energy storage threshold (e.g., 40% of the capacity of the energy storage battery 433 itself) and does not reach the first energy storage threshold (e.g., 80% of the capacity of the energy storage battery 433 itself), the control module 420 determines the power supply strategy as: powering the powered device through the power supply 440 and the energy storage module 430.

[0184] At this time, the current transmission path is as follows: the power supply 440 transmits the first electric energy to the AC-DC module 431, which is then transmitted to the DC-DC discharge module 411, the energy storage battery 433 transmits the second electric energy to the DC-DC energy storage module 432, and the DC-DC energy storage module 432 transmits the second electric energy to the DC-DC discharge module 411. The DC-DC discharge module 411 transmits the first electric energy and the second electric energy to the powered device through the charging interface 412 to supply power to the powered device.

[0185] 2.2 If the remaining energy storage of the energy storage battery 433 is lower than the second energy storage threshold (e.g., 40% of the capacity of the energy storage battery 433 itself), and the output power of the power supply 440 does not meet the transmission power requirement of the powered device, the control module 420 determines the power supply strategy as: powering the powered device through the power supply 440.

[0186] At this time, the current transmission path is as follows: the power supply 440 transmits the first electrical energy to the AC-DC module 431, which is then transmitted to the DC-DC discharge module 411, and the DC-DC discharge module 411 transmits the first electrical energy to the powered device through the charging interface 412 to supply power to the powered device.

[0187] 3. When the power supply strategy includes supplying power to the powered device through the second electric energy provided by the energy storage battery 433, the energy storage battery 433 transmits the second electric energy to the DC-DC energy storage module 432; the DC-DC energy storage module 432 transmits the second electric energy to the DC-DC discharge module 411; the DC-DC discharge module 411 transmits the second electric energy to the powered device through the charging interface 412.

[0188] Exemplarily, there is a communication connection between the control module 420 and the charging interface 412. When the charging interface 412 is connected to the powered device, the charging interface 412 forwards the charging instruction sent by the powered device to the control module 420, and the control module 420 obtains the transmission power requirement of the powered device based on the charging instruction. There is a communication connection between the control module 420 and the energy storage module 430, and the remaining energy storage of the energy storage battery 433 is obtained through the communication connection.

[0189] 3.1 If the remaining energy storage of the energy storage battery 433 reaches a first energy storage threshold (eg, 80% of the capacity of the energy storage battery 433 ), the control module 420 determines the power supply strategy as: supplying power to the powered device through the energy storage module 430 .

[0190] At this time, the current transmission path is as follows: the energy storage battery 433 transmits the second electric energy to the DC-DC energy storage module 432, and the DC-DC energy storage module 432 transmits the second electric energy to the DC-DC discharge module 411. The DC-DC discharge module 411 transmits the second electric energy to the powered device through the charging interface 412 to supply power to the powered device.

[0191] 3.2 If the remaining energy storage of the energy storage battery 433 reaches the second energy storage threshold (e.g., 40% of the capacity of the energy storage battery 433 itself) and does not reach the first energy storage threshold (e.g., 80% of the capacity of the energy storage battery 433 itself), the control module 420 determines the power supply strategy as: powering the powered device through the power supply 440 and the energy storage module 430.

[0192] At this time, the current transmission path is as follows: the power supply 440 transmits the first electric energy to the AC-DC module 431, which is then transmitted to the DC-DC discharge module 411, the energy storage battery 433 transmits the second electric energy to the DC-DC energy storage module 432, and the DC-DC energy storage module 432 transmits the second electric energy to the DC-DC discharge module 411. The DC-DC discharge module 411 transmits the first electric energy and the second electric energy to the powered device through the charging interface 412 to supply power to the powered device.

[0193] Among them, the process of situation 3.2 is the same as that of situation 2.1.

[0194] In summary, the DC bus power management system provided by the present application uses the power supply and the energy storage battery as the power source for powering the powered equipment, which can alleviate the pressure of the power supply to power multiple devices during peak power consumption, increase the output power when charging the powered equipment, and improve the charging efficiency of the DC bus power management system. When the energy storage battery needs to be charged, the power supply can also charge the energy storage battery. When the energy storage battery needs to be discharged or charged, it is necessary to transmit power through the DC-to-DC discharge module. When the power demand of the powered equipment is low, the utilization rate of the DC-to-DC discharge module can still be guaranteed, alleviating the problem of low charging efficiency caused by the DC-to-DC discharge module being in a light-load working state for a long time.

[0195] Figure 5 It is a schematic diagram of an AC bus power management system provided by an exemplary embodiment of the present application.

[0196] The AC bus power management system 500 includes a charge-discharge module 510 , a control module 520 and an energy storage module 530 . The charge-discharge module 510 is externally connected to a power source 540 .

[0197] Among them, the charging and discharging module 510 includes an AC-to-DC discharging module 511, a charging interface 512, and a first AC contactor 513; the control module 520 includes an energy storage charging management module 521 and a control power supply 522; the energy storage module 530 includes an AC-to-DC energy storage module 531, an energy storage battery 532, and a second AC contactor 533.

[0198] The energy storage charging management module 521 in the control module 520 is used to obtain the power supply strategy, and the control power supply 522 is connected to the power supply 540 to obtain the electric energy required to maintain the normal operation of the DC bus power management system.

[0199] The second AC contactor 533 in the energy storage module 530 is connected to the power supply 540 to control the direction of the current and prevent the current from flowing back. The power supply 540 provides AC power, which is transmitted to the AC-DC energy storage module 531 through the second AC contactor 533. The AC-DC energy storage module 531 transmits the DC power to the energy storage battery 532, which stores the energy as the second electric energy for supplying power to the power receiving device.

[0200] The first AC contactor 513 in the charge and discharge module 510 is connected to the power supply 540, and has the same function as the second AC contactor 533. The power supply 540 transmits AC power to the AC-DC discharge module 511 through the first AC contactor 513. The AC-DC discharge module 511 transmits DC power to the power receiving device through the charging interface 512.

[0201] The electrical connection relationship between the modules in the AC bus power management system 500 is as follows: the AC-to-DC discharge module 511 is electrically connected to the charging interface 512, and the AC-to-DC discharge module 511 is electrically connected to the first AC contactor 513; the energy storage charging management module 521 is electrically connected to the control power supply 522; the AC-to-DC energy storage module 531 is electrically connected to the energy storage battery 532, and the AC-to-DC energy storage module 531 is electrically connected to the second AC contactor 533; the AC-to-DC energy storage module 531 is electrically connected to the AC-to-DC discharge module 511; the power power supply 540 is electrically connected to the control power supply 522; the power power supply 540 is electrically connected to the first AC contactor 513; the power power supply 540 is electrically connected to the second AC contactor 533.

[0202] The communication connection relationship between the modules in the AC bus power management system 500 is as follows: a communication connection is established between the energy storage charging management module 521 and the AC to DC discharge module 511; a communication connection is established between the energy storage charging management module 521 and the charging interface 512; a communication connection is established between the energy storage charging management module 521 and the AC to DC energy storage module 531; and a communication connection is established between the energy storage charging management module 521 and the energy storage battery 532.

[0203] In some embodiments, the control module 520 also includes a screen interaction module 523 , a heat dissipation fan module 524 , and an electric meter measurement module 525 .

[0204] The screen interaction module 523 is used to receive operation instructions and send the operation instructions to the energy storage charging management module 521 in the control module 520, and the energy storage charging management module 521 obtains the power supply strategy corresponding to the operation instructions. The cooling fan module 524 is used to dissipate heat for each module in the AC bus power management system 500 to avoid failures caused by the heat generated by each module during operation. The electric meter measurement module 525 is used to monitor the costs and total amount of power transmission generated when the AC bus power management system 500 and the powered equipment are transmitting power.

[0205] For example, the AC bus power management system 500 is implemented as a charging pile, and the power receiving device is an electric vehicle. The screen interaction module 523 is used to provide a medium for interaction between the user and the charging pile. The user driving the electric vehicle can input instructions through the screen interaction module 523 to obtain power from the charging pile to charge the electric vehicle, or transmit the power in the electric vehicle to the charging pile.

[0206] Among them, during the charging process of the electric vehicle, the electric meter measurement module 525 will monitor the fees generated by the process that need to be paid by the user and the total amount of power transferred (specifically reflected in the increase in the battery power of the electric vehicle); during the discharge of the electric vehicle to the charging pile, the electric meter measurement module 525 will monitor the fees generated by the process that the user can obtain and the total amount of power transferred (specifically reflected in the decrease in the battery power of the electric vehicle).

[0207] Optionally, the energy storage charging management module 521 in the control module 520 is used to obtain a power supply strategy, and the types of power supply strategies include the following.

[0208] 1. When the power supply strategy indicates to supply power to the energy storage module 530 , the second AC contactor 533 transmits the first electric energy provided by the power source 540 to the AC-DC energy storage module 531 ; the AC-DC energy storage module 531 transmits the first electric energy to the energy storage battery 532 .

[0209] 1.1 For example, there is a communication connection between the control module 520 and the charging interface 512. When the charging interface 512 is connected to the powered device, the charging interface 512 forwards the charging instruction sent by the powered device to the control module 520, and the control module 520 obtains the transmission power requirement of the powered device based on the charging instruction. There is a communication connection between the control module 520 and the energy storage module 530, and the remaining energy storage of the energy storage battery 532 is obtained through the communication connection.

[0210] If the remaining energy storage of the energy storage battery 532 is lower than the second energy storage threshold (e.g., 20% of the capacity of the energy storage battery 532 itself), and the output power of the power supply 540 meets the transmission power requirement of the powered device, the control module 520 determines the power supply strategy as follows: power the energy storage module 530 and the powered device at the same time through the power supply 540.

[0211] At this time, the current transmission path is as follows: the power supply 540 transmits the first electric energy to the AC-to-DC discharge module 511 through the first AC contactor 513, the power supply 540 transmits the first electric energy to the AC-to-DC energy storage module 531 through the second AC contactor 533, and the AC-to-DC energy storage module 531 transmits the first electric energy to the energy storage battery 532 to supply power to the energy storage battery 532. The AC-to-DC discharge module 511 transmits the first electric energy to the powered device through the charging interface 512 to supply power to the powered device.

[0212] During this process, the output power of the AC-DC discharge module 511 meets the transmission power requirement of the powered device, and the output power transmitted by the AC-DC energy storage module 531 to the energy storage module 530 is determined based on the difference between the transmission power requirement of the powered device and the output power of the power supply 540 .

[0213] 1.2 For example, there is a communication connection between the control module 520 and the charging interface 512. When the charging interface 512 is not connected to the powered device, it means that the AC bus power management system 500 does not need to supply power to any powered device. There is a communication connection between the control module 520 and the energy storage module 530, and the remaining energy storage of the energy storage battery 532 is obtained through the communication connection.

[0214] If the remaining energy storage of the energy storage battery 532 is lower than the second energy storage threshold (eg, 20% of the capacity of the energy storage battery 532 ), the control module 520 determines the power supply strategy as: supplying power to the energy storage module 530 through the power supply 540 .

[0215] At this time, the current transmission path is as follows: the power supply 540 transmits the first electrical energy to the AC-to-DC energy storage module 531 through the second AC contactor 533 , and the AC-to-DC energy storage module 531 transmits the first electrical energy to the energy storage battery 532 to supply power to the energy storage battery 532 .

[0216] In this process, the output power transmitted by the AC-to-DC energy storage module 531 to the energy storage battery 532 is determined based on the output power of the power source 540 .

[0217] In some embodiments, when the AC bus power management system 500 is connected to a powered device, if the powered device actively initiates a discharge instruction to the control module 520, that is, when the powered device actively supplies power to the energy storage module 530, the power supply strategy is determined based on the discharge instruction and the remaining energy storage module 530.

[0218] For example, when the energy storage battery 532 has the capacity to receive the electric energy actively transmitted by the powered device, the current transmission path is as follows: the powered device transmits the electric energy to the AC-to-DC discharge module 511 through the charging interface 512, the AC-to-DC discharge module 511 transmits the electric energy to the AC-to-DC energy storage module 531, and the AC-to-DC energy storage module 531 transmits the electric energy to the energy storage battery 532 to supply power to the energy storage battery 532.

[0219] 2. When the power supply strategy includes supplying power to the powered device through the first electric energy provided by the power supply 540, the first AC contactor 513 transmits the first electric energy provided by the power supply 540 to the AC-to-DC discharge module 511; the AC-to-DC discharge module 511 transmits the first electric energy to the powered device through the charging interface 512, wherein the powered device and the charging interface 512 are electrically connected.

[0220] Exemplarily, there is a communication connection between the control module 520 and the charging interface 512. When the charging interface 512 is connected to the powered device, the charging interface 512 forwards the charging instruction sent by the powered device to the control module 520, and the control module 520 obtains the transmission power requirement of the powered device based on the charging instruction. There is a communication connection between the control module 520 and the energy storage module 530, and the remaining energy storage of the energy storage battery 532 is obtained through the communication connection.

[0221] 2.1 If the remaining energy storage of the energy storage battery 532 reaches the second energy storage threshold (e.g., 20% of the capacity of the energy storage battery 532 itself) and does not reach the first energy storage threshold (e.g., 80% of the capacity of the energy storage battery 532 itself), the control module 520 determines the power supply strategy as: powering the powered device through the power supply 540 and the energy storage module 530.

[0222] At this time, the current transmission path is as follows: the power supply 540 transmits the first electric energy to the AC-DC discharging module 511 through the first AC contactor 513, and the energy storage battery 532 transmits the second electric energy to the AC-DC energy storage module 531. The AC-DC discharging module 511 transmits the first electric energy and the second electric energy to the powered device through the charging interface 512 to supply power to the powered device.

[0223] 2.2 If the remaining energy storage of the energy storage battery 532 is lower than the second energy storage threshold (e.g., 20% of the capacity of the energy storage battery 532 itself), and the output power of the power supply 540 does not meet the transmission power requirement of the powered device, the control module 520 determines the power supply strategy as: powering the powered device through the power supply 540.

[0224] At this time, the current transmission path is as follows: the power supply 540 transmits the first electric energy to the AC to DC discharge module 511 through the first AC contactor 513, and the AC to DC discharge module 511 transmits the first electric energy to the powered device through the charging interface 512 to supply power to the powered device.

[0225] 3. When the power supply strategy includes supplying power to the powered device through the second electric energy provided by the energy storage battery 532, the energy storage battery 532 transmits the second electric energy to the AC-DC energy storage module 531; the AC-DC energy storage module 531 transmits the second electric energy to the AC-DC discharge module 511; the AC-DC discharge module 511 transmits the second electric energy to the powered device through the charging interface 512, wherein the powered device and the charging interface 512 are electrically connected.

[0226] Exemplarily, there is a communication connection between the control module 520 and the charging interface 512. When the charging interface 512 is connected to the powered device, the charging interface 512 forwards the charging instruction sent by the powered device to the control module 520, and the control module 520 obtains the transmission power requirement of the powered device based on the charging instruction. There is a communication connection between the control module 520 and the energy storage module 530, and the remaining energy storage of the energy storage battery 532 is obtained through the communication connection.

[0227] 3.1 If the remaining energy storage of the energy storage battery 532 reaches a first energy storage threshold (eg, 80% of the capacity of the energy storage battery 532 ), the control module 520 determines the power supply strategy as: supplying power to the powered device through the energy storage module 530 .

[0228] At this time, the current transmission path is as follows: the energy storage battery 532 transmits the second electric energy to the AC-DC energy storage module 531, and the AC-DC energy storage module 531 transmits the second electric energy to the AC-DC discharge module 511. The AC-DC discharge module 511 transmits the second electric energy to the powered device through the charging interface 512 to supply power to the powered device.

[0229] 3.2 If the remaining energy storage of the energy storage battery 532 reaches the second energy storage threshold (e.g., 20% of the capacity of the energy storage battery 532 itself) and does not reach the first energy storage threshold (e.g., 80% of the capacity of the energy storage battery 532 itself), the control module 520 determines the power supply strategy as: powering the powered device through the power supply 540 and the energy storage module 530.

[0230] At this time, the current transmission path is as follows: the power supply 540 transmits the first electric energy to the AC-DC discharging module 511 through the first AC contactor 513, and the energy storage battery 532 transmits the second electric energy to the AC-DC energy storage module 531. The AC-DC discharging module 511 transmits the first electric energy and the second electric energy to the powered device through the charging interface 512 to supply power to the powered device.

[0231] Among them, the process of situation 3.2 is the same as that of situation 2.1.

[0232] In summary, the AC bus power management system provided by the present application uses both the power supply and the energy storage battery as the power source for powering the powered equipment, which can alleviate the pressure of the power supply to power multiple devices during peak power consumption, increase the output power when charging the powered equipment, and improve the charging efficiency of the AC bus power management system. When the energy storage battery needs to be charged, the power supply can also charge the energy storage battery. When the energy storage battery needs to be discharged or charged, it is necessary to transmit power through the AC to DC discharge module. When the power demand of the powered equipment is low, the utilization rate of the AC to DC discharge module can still be guaranteed, alleviating the problem of low charging efficiency caused by the AC to DC discharge module being in a light-load working state for a long time.

[0233] Figure 6 It is a schematic diagram of a charging pile provided by an exemplary embodiment of the present application.

[0234] The charging pile 600 includes a power management system: an energy storage battery 601, a charging and discharging module 602, a screen interaction module 603, an electric meter measurement module 604, a cooling fan module 605, a charging interface 606, and a control module 607. The charging pile 600 is connected to a power supply 610 and a powered device 620, and bidirectional power transmission can be performed between the powered device 620 and the charging pile 600.

[0235] Exemplarily, taking the powered device 620 as an electric vehicle, the user drives the electric vehicle to the vicinity of the charging pile 600, and connects the electric vehicle to the charging pile 600 through the charging interface 606. The charging interface 606 can be a charging gun, and there is a socket in the electric vehicle that matches the charging gun.

[0236] The user can input operation instructions to the screen interaction module 603, such as charging instructions, indicating that the charging pile 600 supplies power to the powered device 620; or discharging instructions, indicating that the powered device 620 actively supplies power to the charging pile 600. After the operation instructions are transmitted to the control module 607, the control module 607 obtains the power supply strategy.

[0237] When the charging pile 600 supplies power to the power receiving device 620, it can be realized by at least one of the power source 610 and the energy storage battery 601. When the power source 610 supplies power, the charging and discharging module 602 directly transmits the first electric energy to the power receiving device 620; when the energy storage battery 601 supplies power, the charging and discharging module 602 transmits the second electric energy in the energy storage battery 601 to the power receiving device 620.

[0238] Similarly, when the power receiving device 620 actively supplies power to the charging pile 600 , it is also necessary to transmit power through the charge and discharge module 602 to transmit the power provided by the power receiving device 620 to the energy storage battery 601 .

[0239] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0240] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A power management method, characterized in that: The method comprises: Acquire a power supply strategy, where the power supply strategy is used to indicate a strategy for supplying power to the powered device or the powered battery based on the energy storage status of the powered battery of the charging pile and the connection status between the charging pile and the powered device; When the power supply strategy indicates that power is supplied to the powered device, power is supplied to the powered device by at least one of the first power provided by the power source connected to the charging pile and the second power provided by the energy storage battery; When the power supply strategy indicates to supply power to the energy storage battery, the energy storage battery is charged by the first electric energy provided by the power source.

2. The method according to claim 1, characterized in that The obtaining of the power supply strategy includes: When the powered device is connected, receiving a charging instruction sent by the powered device, wherein the charging instruction includes an output power requirement when supplying power to the powered device; A power supply strategy for supplying power to the powered device is obtained based on the energy storage status of the energy storage battery and the output power requirement.

3. The method according to claim 2, characterized in that The acquiring a power supply strategy for supplying power to the powered device based on the energy storage condition of the energy storage battery and the output power requirement includes: When the remaining energy storage of the energy storage battery reaches a first energy storage threshold, determining that the power supply strategy includes supplying power to the powered device through the second electric energy provided by the energy storage battery; The at least one of the first electric energy provided by the power source connected to the charging pile and the second electric energy provided by the energy storage battery supplies power to the powered device, comprising: The second electric energy provided by the energy storage battery is transmitted to the powered device through the charging and discharging module of the charging pile.

4. The method according to claim 2, characterized in that: The acquiring a power supply strategy for supplying power to the powered device based on the energy storage condition of the energy storage battery and the output power requirement includes: When the remaining energy storage of the energy storage battery reaches a second energy storage threshold and does not reach the first energy storage threshold, determining that the power supply strategy includes supplying power to the powered device through the first electric energy provided by the power source and the second electric energy provided by the energy storage battery; Determine a first discharge power ratio of the power source and the energy storage battery to supply power to the powered device based on the remaining stored energy of the energy storage battery, the output power of the power source, and the output power requirement; The at least one of the first electric energy provided by the power source connected to the charging pile and the second electric energy provided by the energy storage battery supplies power to the powered device, comprising: receiving, through the charging and discharging module of the charging pile, the first electric energy provided by the power source and the second electric energy provided by the energy storage battery, wherein the first electric energy provided by the power source and the second electric energy provided by the energy storage battery meet the first discharge power ratio; The first electric energy provided by the power source and the second electric energy provided by the energy storage battery are transmitted to the power receiving device through the charging and discharging module.

5. The method according to claim 2, characterized in that: The acquiring a power supply strategy for supplying power to the powered device based on the energy storage condition of the energy storage battery and the output power requirement includes: When the remaining energy storage of the energy storage battery does not reach the second energy storage threshold, determining that the power supply strategy includes supplying power to the powered device through the first electric energy provided by the power power supply; The at least one of the first electric energy provided by the power source connected to the charging pile and the second electric energy provided by the energy storage battery supplies power to the powered device, comprising: The first electric energy provided by the power source is transmitted to the power receiving device through the charging and discharging module of the charging pile.

6. The method according to claim 5, characterized in that When the remaining energy storage of the energy storage battery does not reach the second energy storage threshold, determining that the power supply strategy includes supplying power to the powered device through the first electric energy provided by the power power supply includes: In response to the output power of the power source meeting the output power requirement, determining the power supply strategy includes supplying power to the powered device and the energy storage battery based on the first electric energy provided by the power source; Determine a second discharge power ratio for supplying power to the powered device and the energy storage battery through the first electric energy based on the remaining stored energy of the energy storage battery, the output power of the power source, and the output power requirement; The at least one of the first electric energy provided by the power source connected to the charging pile and the second electric energy provided by the energy storage battery supplies power to the powered device, comprising: The first electric energy provided by the power source is transmitted to the power receiving device and the energy storage battery through the charge and discharge module of the charging pile based on the second discharge power ratio.

7. The method according to any one of claims 1 to 6, characterized in that: The obtaining of the power supply strategy includes: Acquiring power source load information when the powered device is not connected; When the power source load information indicates that the power source can provide the first electric energy to the charging and discharging module of the charging pile, determining that the power supply strategy includes supplying power to the energy storage battery based on the first electric energy provided by the power source; The step of charging the energy storage battery with the first electric energy provided by the power source comprises: The first electric energy provided by the power source is transmitted to the energy storage battery through the charge and discharge module.

8. The method according to any one of claims 1 to 6, characterized in that: The method further comprises: In a case where the power source cannot provide the first electric energy to the charging pile and the energy storage battery has residual energy, in response to the charging pile being connected to a power receiving device, receiving a charging instruction sent by the power receiving device; Determining, based on the charging instruction, that the power supply strategy is to supply power to the powered device based on the energy storage battery; The powered device is powered by the second electric energy provided by the energy storage battery.

9. A power management system, characterized in that: The system includes a charging and discharging module, a control module and an energy storage module, and the charging and discharging module is externally connected to a power source; The control module is configured to obtain a power supply strategy, where the power supply strategy is used to indicate a strategy for supplying power to the powered device or the energy storage module based on the energy storage status of the energy storage module and the connection status of the powered device; The charging and discharging module is configured to supply power to the powered device through at least one of the first power provided by the power source and the second power provided by the energy storage module when the power supply strategy indicates supplying power to the powered device; The charging and discharging module is further configured to charge the energy storage module by using the first electric energy provided by the power supply when the power supply strategy indicates to supply power to the energy storage module.

10. The power management system according to claim 9, characterized in that: The control module is also configured to receive a charging instruction sent by the powered device when the powered device is connected, wherein the charging instruction includes an output power requirement when powering the powered device; and obtain a power supply strategy for powering the powered device based on the energy storage status of the energy storage module and the output power requirement.

11. The power management system according to claim 10, characterized in that: The control module is further configured to determine, when the remaining stored energy of the energy storage module reaches a first stored energy threshold, that the power supply strategy includes supplying power to the powered device through the second electric energy provided by the energy storage module; The energy storage module is configured to transmit the second electric energy to the charging and discharging module based on the power supply strategy; The charging and discharging module is configured to supply power to the powered device through the second electrical energy.

12. The power management system according to claim 10, characterized in that: The control module is further configured to determine that the power supply strategy includes supplying power to the powered device through the first electric energy provided by the power source and the second electric energy provided by the energy storage module when the remaining stored energy of the energy storage module reaches the second energy storage threshold but does not reach the first energy storage threshold; Determine a first discharge power ratio of the power supply and the energy storage module to supply power to the powered device based on the remaining stored energy of the energy storage module, the output power of the power supply and the output power requirement; The energy storage module is configured to deliver the second electric energy to the charge-discharge module based on the first discharge power ratio; The charging and discharging module is configured to supply power to the powered device through the first electric energy and the second electric energy based on the first discharge power ratio.

13. The power management system according to claim 10, characterized in that: The control module is further configured to determine that the power supply strategy includes supplying power to the powered device through the first electric energy provided by the power source when the remaining stored energy of the energy storage module does not reach the second stored energy threshold; The charging and discharging module is configured to receive the first electric energy transmitted by the power source, and to supply power to the powered device through the first electric energy.

14. The power management system according to claim 13, characterized in that: The control module is further configured to, in response to the output power of the power source meeting the output power requirement, determine that the power supply strategy includes supplying power to the powered device and the energy storage module based on the first electric energy provided by the power source; Determine a second discharge power ratio for supplying power to the powered device and the energy storage module through the first electric energy based on the remaining stored energy of the energy storage module, the output power of the power source and the output power requirement; The charging and discharging module is configured to supply power to the powered device and the energy storage module through the first electrical energy based on the second discharge power ratio.

15. The power management system according to any one of claims 9 to 14, characterized in that: The control module is further configured to obtain power supply load information when the power receiving device is not connected; and when the power supply load information indicates that the power supply can provide the first electric energy to the charging and discharging module, determine that the power supply strategy includes supplying power to the energy storage module based on the charging and discharging module; The charging and discharging module is configured to charge the energy storage module through the first electric energy provided by the power source.

16. The power management system according to any one of claims 9 to 14, characterized in that: The control module is further configured to receive a discharge instruction sent by the powered device when the powered device is connected, wherein the discharge instruction includes a target charge amount for the powered device to charge the energy storage module; Acquire the power supply strategy based on the energy storage status of the energy storage module and the target charge amount; The charging and discharging module is further configured to charge the energy storage module based on the target charge amount when the capacity of the energy storage module is greater than or equal to the target charge amount.

17. The power management system according to any one of claims 9 to 14, characterized in that: The energy storage module is further configured to provide the second electric energy to the control module when the power source cannot provide the first electric energy to the power management system and the energy storage module has residual stored energy; The control module is further configured to receive a charging instruction sent by the powered device when the powered device is connected; determine the power supply strategy based on the charging instruction to supply power to the powered device based on the energy storage module; The energy storage module is further configured to supply power to the powered device through the second electrical energy.

18. The power management system according to any one of claims 9 to 14, characterized in that: The system includes a DC bus power management system; The charging and discharging module includes a DC to DC discharging module and a charging interface; The control module includes an energy storage charging management module and a control power supply; The energy storage module includes an AC-to-DC module, a DC-to-DC energy storage module, and an energy storage battery; The DC-to-DC discharge module is electrically connected to the charging interface; The energy storage charging management module is electrically connected to the control power supply; The AC-DC module is electrically connected to the DC-DC energy storage module; the DC-DC energy storage module is electrically connected to the energy storage battery; The AC-DC module is electrically connected to the DC-DC discharge module; the DC-DC energy storage module is electrically connected to the DC-DC discharge module; The power supply is electrically connected to the control power supply; the power supply is electrically connected to the AC to DC converter; A communication connection is established between the energy storage charging management module and the AC-DC module; a communication connection is established between the energy storage charging management module and the DC-DC discharge module; a communication connection is established between the energy storage charging management module and the charging interface; a communication connection is established between the energy storage charging management module and the DC-DC energy storage module; and a communication connection is established between the energy storage charging management module and the energy storage battery.

19. The power management system according to claim 18, characterized in that: The AC-DC module is configured to transmit the first electric energy provided by the power source to the DC-DC energy storage module when the power supply strategy indicates to supply power to the energy storage module; The DC-to-DC energy storage module is configured to transmit the first electric energy to the energy storage battery when the power supply strategy indicates to supply power to the energy storage module; The AC-DC module is further configured to transmit the first electric energy provided by the power source to the DC-DC discharge module when the power supply strategy includes supplying power to the powered device through the first electric energy provided by the power source; The DC-to-DC discharge module is configured to, when the power supply strategy includes supplying power to the powered device through the first electric energy provided by the power source, transmit the first electric energy to the powered device through the charging interface, wherein the powered device is electrically connected to the charging interface; The energy storage battery is configured to, when the power supply strategy includes supplying power to the powered device through the second electric energy provided by the energy storage battery, transmit the second electric energy to the DC-to-DC energy storage module; The DC-to-DC energy storage module is further configured to, when the power supply strategy includes supplying power to the powered device via the second electric energy provided by the energy storage battery, transmit the second electric energy to the DC-to-DC discharge module; The DC-to-DC discharge module is further configured to transmit the second electric energy to the powered device through the charging interface when the power supply strategy includes supplying power to the powered device through the second electric energy provided by the energy storage battery.

20. The power management system according to any one of claims 9 to 14, characterized in that: The system includes an AC bus power management system; The charging and discharging module includes an AC to DC discharging module, a charging interface, and a first AC contactor; The control module includes an energy storage charging management module and a control power supply; The energy storage module includes an AC-to-DC energy storage module, an energy storage battery, and a second AC contactor; The AC-DC discharge module is electrically connected to the charging interface, and the AC-DC discharge module is electrically connected to the first AC contactor; The energy storage charging management module is electrically connected to the control power supply; The AC-to-DC energy storage module is electrically connected to the energy storage battery, and the AC-to-DC energy storage module is electrically connected to the second AC contactor; The AC-to-DC energy storage module is electrically connected to the AC-to-DC discharge module; The power supply is electrically connected to the control power supply; the power supply is electrically connected to the first AC contactor; the power supply is electrically connected to the second AC contactor; A communication connection is established between the energy storage charging management module and the AC-DC discharging module; a communication connection is established between the energy storage charging management module and the charging interface; a communication connection is established between the energy storage charging management module and the AC-DC energy storage module; and a communication connection is established between the energy storage charging management module and the energy storage battery.

21. The power management system according to claim 20, characterized in that: The second AC contactor is configured to transmit the first electric energy provided by the power source to the AC-to-DC energy storage module when the power supply strategy indicates to supply power to the energy storage module; The AC-to-DC energy storage module is configured to transmit the first electric energy to the energy storage battery when the power supply strategy indicates to supply power to the energy storage module; The first AC contactor is further configured to transmit the first electric energy provided by the power source to the AC-to-DC discharge module when the power supply strategy includes supplying power to the powered device through the first electric energy provided by the power source; The AC-DC discharging module is configured to transmit the first electric energy to the powered device through the charging interface when the power supply strategy includes supplying power to the powered device through the first electric energy provided by the power source, wherein the powered device is electrically connected to the charging interface; The energy storage battery is configured to transmit the second electric energy to the AC-to-DC energy storage module when the power supply strategy includes supplying power to the powered device through the second electric energy provided by the energy storage battery; The AC-DC energy storage module is further configured to, when the power supply strategy includes supplying power to the powered device through the second electric energy provided by the energy storage battery, transmit the second electric energy to the AC-DC discharge module; The AC-to-DC discharge module is further configured to transmit the second electric energy to the powered device through the charging interface when the power supply strategy includes supplying power to the powered device through the second electric energy provided by the energy storage battery, wherein the powered device is electrically connected to the charging interface.

22. A charging pile, characterized in that: The charging pile includes a power management system as described in any one of claims 9 to 21.

Images