A charging device that integrates energy storage and charging

Abstract

This invention relates to the field of new energy charging equipment technology, and discloses an integrated charging and energy storage device, including: a current sensor, an AC / DC power module, a control module, a first switch module, a second switch module, an energy storage module, and a charging gun module. The current sensor monitors grid parameters and feeds them back to the control module. The control module switches the first switch module and the second switch module to make the output power of the charging gun the sum of the power of the AC / DC power module and the energy storage module, thus overcoming the grid power limit. At the same time, it dynamically adjusts the power of the AC / DC power module according to the total grid load to avoid overload.

Description

Technical Field

[0001] This invention relates to the field of new energy charging equipment technology, specifically to an integrated energy storage and charging device. Background Technology

[0002] Traditional DC charging stations heavily rely on the power grid. The prerequisite for so-called fast charging and supercharging is that the power grid must provide AC power of corresponding strength. The AC power is then converted to DC power by the AC-DC power module inside the charging station before being output to the electric vehicle. This leads to the following problems:

[0003] 1. Power Limitation Issue: The output power of traditional DC charging piles is limited by the maximum input power from the power grid. For example, if the maximum input power provided by the power grid is 20kW, then even if the output power of the DC charging pile is 120kW, due to the limitation of the power grid's input power, the 120kW DC charging pile can only provide a maximum of 20kW charging service. Its disadvantage is that it cannot fully utilize the output performance of the charging pile, significantly reducing the charging experience. Increasing the power distribution capacity further increases the investment cost and construction and maintenance work significantly.

[0004] 2. Overload Risk: In addition to supplying power to charging stations, the power grid distribution system must also meet the power demands of other loads (such as lighting, air conditioning, and cooking equipment), causing the power allocated to charging stations to fluctuate between 0 and 20kW. Therefore, when all 20kW is used for charging, an overload will occur when other loads (assuming a power of 5kW) start up, leading to anything from power outages to disasters. To address this, traditional DC charging stations typically set the input power to a fixed value. The drawback of this method is that it cannot dynamically adjust the input power; when other loads are not running, the input power received by the charging station remains at 15kW. Summary of the Invention

[0005] In view of this, the present invention provides an integrated charging and energy storage device to solve the problems of power limitation and overload risk of traditional DC charging piles.

[0006] This invention provides an integrated energy storage and charging device, comprising: a current sensor, an ACDC power module, a control module, a first switch module, a second switch module, an energy storage module, and a charging gun module, wherein...

[0007] The input terminal of the current sensor is connected to the AC power grid, the first output terminal of the current sensor is connected to the input terminal of the AC / DC power module, the communication terminal of the current sensor is connected to the first terminal of the control module, the first output terminal of the AC / DC power module is connected to the input terminal of the first switch module, and the communication terminal of the AC / DC power module is connected to the second terminal of the control module.

[0008] The first output terminal of the first switch module is connected to the first input terminal of the charging gun module, the second output terminal of the first switch module is connected to the input terminal of the energy storage module, and the communication terminal of the first switch module is connected to the third terminal of the control module.

[0009] The input terminal of the second switch module is connected to the output terminal of the energy storage module, the output terminal of the second switch module is connected to the second input terminal of the charging gun module, and the communication terminal of the second switch module is connected to the fourth terminal of the control module.

[0010] When the output power of the ACDC power module is less than the vehicle's requested power, the control module controls the first switch module to disconnect the circuit of the energy storage module and close the circuit of the charging gun module, while simultaneously controlling the second switch module to close the circuit of the charging gun module, thereby activating the energy storage module to supplement power supply.

[0011] When the grid-side parameters exceed the first preset threshold, the control module sends a power reduction command to the ACDC power module to control it to reduce its output power; when the grid-side parameters are lower than the first preset threshold, the control module sends a power increase command to the ACDC power module to control it to increase its output power.

[0012] The present invention provides an integrated charging and energy storage device. A current sensor monitors grid parameters and feeds them back to the control module. The control module switches the first switch module and the second switch module to make the output power of the charging gun the sum of the power of the AC-DC power module and the energy storage module, thus breaking through the grid power limit. At the same time, it dynamically adjusts the power of the AC-DC power module according to the total grid load to avoid overload.

[0013] In one optional implementation, the control module is further configured to adjust the charging and discharging logic according to the energy storage instructions issued from the cloud.

[0014] In one optional implementation, the charge / discharge logic includes:

[0015] Monitor whether the integrated charging and storage device is in the vehicle charging state;

[0016] When the integrated energy storage and charging device is not in the vehicle charging state, the first switch module is controlled to close the circuit of the energy storage module and disconnect the circuit of the charging gun module, the second switch module is controlled to disconnect the circuit of the charging gun module, and the ACDC power module is started, so that the integrated energy storage and charging device enters the energy storage state.

[0017] When the integrated charging and storage device is in the vehicle charging state, after the vehicle charging is completed, return to the step of monitoring whether the integrated charging and storage device is in the charging state.

[0018] In one optional implementation, the charge / discharge logic further includes:

[0019] Monitor whether a vehicle has connected to the integrated charging and storage device and is ready to charge;

[0020] If a vehicle is connected to prepare for charging, the ACDC power module will be paused.

[0021] The first switch module is controlled to disconnect the circuit of the energy storage module and close the circuit of the charging gun module, and the second switch module is controlled to close the circuit of the charging gun module, thereby starting the ACDC power module and putting the integrated energy storage and charging device into the charging state.

[0022] After the vehicle finishes charging, it will recharge.

[0023] In one optional implementation, the control module is further configured to adjust the charging and discharging logic according to the peak-valley electricity price period instructions issued by the cloud.

[0024] In one optional implementation, the charge / discharge logic includes:

[0025] During off-peak hours, if a vehicle is charging, the ACDC power module is prioritized to draw power directly from the grid to supply power to the vehicle.

[0026] If the vehicle requests a current greater than the maximum output current of the ACDC power module and the remaining power of the energy storage module is greater than the second preset threshold, then the energy storage module is activated to supplement power supply.

[0027] If no vehicle is charging, the AC / DC power module is controlled to operate at full power to charge the energy storage module to full capacity.

[0028] In one optional implementation, the charge / discharge logic further includes:

[0029] During peak / off-peak power periods, if a vehicle is charging, the energy storage module will be prioritized to supply power to the vehicle.

[0030] If the vehicle requests a current greater than the maximum output current of the energy storage module, the AC-CDC power module will be activated to supplement the power supply.

[0031] In one optional embodiment, the energy storage module includes: an energy storage battery module and a DC-DC power module, wherein,

[0032] The input terminal of the energy storage battery module is connected to the second output terminal of the first switch module, the output terminal of the energy storage battery module is connected to the input terminal of the DC-DC power module, and the output terminal of the DC-DC power module is connected to the input terminal of the second switch module.

[0033] In one optional implementation, the charge / discharge logic further includes:

[0034] The charging request power of the vehicle is monitored in real time. If the charging request power is higher than the total power of the current working module for several consecutive times, it is determined whether the current period is peak power / flat power.

[0035] If it is currently a peak power / flat power period, then determine if there are any idle DC-DC power modules;

[0036] If there is an available DC-DC power module, then the DC-DC power module is activated, and the energy storage module supplies power to the vehicle.

[0037] If there are no available DC-DC power modules, then check if there are any available AC-DC power modules.

[0038] If an AC / DC power module is available, activate it to supply power to the vehicle from the grid side.

[0039] In one optional implementation, the charge / discharge logic further includes:

[0040] If it is not currently a peak / off-peak power period, then determine if there are any available AC / DC power modules;

[0041] If an AC-CDC power module is available, activate the AC-CDC power module to supply power to the vehicle from the grid side.

[0042] If there are no available AC / DC power modules, then determine if there are any available DC / DC power modules.

[0043] If a DC-DC power module is available, it is activated, and the energy storage module supplies power to the vehicle.

[0044] In one optional implementation, the charge / discharge logic further includes:

[0045] If the power of several consecutive charging requests is lower than the total power of the current working module, then determine whether the current period is a peak power / flat power period;

[0046] If it is currently a peak power / off power period, determine whether there are any operating AC / DC power modules;

[0047] If there is an AC / DC power module in operation, control the AC / DC power module to go into sleep mode;

[0048] If there is no running AC / DC power module, then determine whether there is a running DC / DC power module.

[0049] If a DC-DC power module is running, control the DC-DC power module to go into sleep mode.

[0050] In one optional implementation, the charge / discharge logic further includes:

[0051] If it is not currently a peak / off-peak power period, then determine whether there is a running DC-DC power module;

[0052] If there is a running DC-DC power module, control the DC-DC power module to hibernate;

[0053] If there is no running DC-DC power module, then determine whether there is a running AC-DC power module.

[0054] If there is an AC / CDC power module in operation, control the AC / CDC power module to go into sleep mode. Attached Figure Description

[0055] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0056] Figure 1 This is a schematic diagram of an integrated charging and storage device according to an embodiment of the present invention;

[0057] Figure 2 This is a schematic diagram of another integrated charging and storage device according to an embodiment of the present invention;

[0058] Figure 3 This is a schematic diagram of the power follower control process according to an embodiment of the present invention;

[0059] Figure 4 This is a schematic diagram of the energy storage and discharge process according to an embodiment of the present invention;

[0060] Figure 5This is a schematic diagram of another integrated charging and storage device according to an embodiment of the present invention;

[0061] Figure 6 This is a schematic diagram of the adjustment process for the number of working modules according to an embodiment of the present invention;

[0062] Figure 7 This is a schematic diagram of another working module quantity adjustment process according to an embodiment of the present invention. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0065] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0066] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0067] like Figure 1As shown, this invention provides an integrated charging and energy storage device, comprising: a current sensor, an AC / DC power module, a control module, a first switch module, a second switch module, an energy storage module, and a charging gun module. The input terminal of the current sensor is connected to the 380V AC power grid, the first output terminal of the current sensor is connected to the input terminal of the AC / DC power module, and the communication terminal of the current sensor is connected to the first terminal of the control module. The first output terminal of the AC / DC power module is connected to the input terminal of the first switch module, and the communication terminal of the AC / DC power module is connected to the second terminal of the control module. The first output terminal of the first switch module is connected to the first input terminal of the charging gun module, the second output terminal of the first switch module is connected to the input terminal of the energy storage module, and the communication terminal of the first switch module is connected to the third terminal of the control module. The input terminal of the second switch module is connected to the output terminal of the energy storage module, the output terminal of the second switch module is connected to the second input terminal of the charging gun module, and the communication terminal of the second switch module is connected to the fourth terminal of the control module. When the grid-side parameters exceed the first preset threshold, the control module sends a power reduction command to the ACDC power module to control it to reduce its output power; when the grid-side parameters are lower than the first preset threshold, the control module sends a power increase command to the ACDC power module to control it to increase its output power.

[0068] Specifically, the current sensor is used to collect parameters such as voltage, current, power, and harmonics in real time and transmit the data to the control module. The ACDC power module converts the 380V AC power from the grid into DC power and can adjust its output power according to the control module's instructions. The first switch module receives instructions from the control module and, by switching its own circuit on / off state, realizes the directional distribution of DC power output from the ACDC power module. Specifically, there are two power flow modes: Mode 1, disconnecting the energy storage battery module's circuit and closing the charging gun module's circuit; Mode 2, closing the energy storage battery module's circuit and disconnecting the charging gun module's circuit. The second switch module controls whether the energy storage module supplies power to the charging gun by opening or closing the charging gun module's circuit. The charging gun module connects to the new energy vehicle for power supply, and its output power is equal to the sum of the output power of the ACDC power module and the output power of the energy storage module.

[0069] Furthermore, when the output power of the ACCDC power module is less than the vehicle's requested power, the control module controls the first switch module to disconnect the circuit of the energy storage module and close the circuit of the charging gun module, allowing all the electrical energy from the ACCDC power module to flow to the charging gun and not to the energy storage module. At the same time, the control module controls the second switch module to close the circuit of the charging gun module, opening the path from the energy storage module to the charging gun, activating the energy storage module to supplement power supply, ultimately achieving the output power of the charging gun = the output power of the ACCDC power module + the output power of the energy storage module, breaking through the grid-side power limit, improving charging speed, and enhancing user experience.

[0070] The control module collects grid-side parameters (such as current and voltage data) from the current sensor in real time. When the grid-side parameters exceed a first preset threshold, the control module sends a power reduction command to the ACDC power module, controlling it to reduce its output power. For example, assuming the rated power of the ACDC power module is 80kW, and the current sensor detects that the load at the downstream of the distribution network exceeds the first threshold of 20kW, the control module will immediately notify the ACDC power module to reduce its power by 20kW. Upon receiving the notification, the ACDC power module will reduce its power from 80kW to 60kW. Conversely, when the grid-side parameters are below the first preset threshold, the control module sends a power increase command to the ACDC power module, controlling it to increase its output power. For example, assuming the current sensor detects that the load at the downstream of the distribution network is below the threshold of 20kW, and the power of the ACDC power module is 50kW, the control module will immediately notify the ACDC power module to increase its power by 20kW. Upon receiving the notification, the ACDC power module will reduce its power from 50kW to 70kW. In this embodiment of the invention, the first preset threshold is set according to the operating conditions.

[0071] This invention provides an integrated charging and energy storage device. A current sensor monitors grid parameters and feeds them back to the control module. The control module switches the first and second switch modules to make the output power of the charging gun equal to the sum of the power of the AC-DC power module and the energy storage module. This breaks through the grid power limitation, achieves high output under low grid input, improves charging efficiency, and shortens vehicle charging time. At the same time, it dynamically adjusts the power of the AC-DC power module according to the total grid load to avoid overload, ensure electrical safety, and avoid transformer power waste.

[0072] In one alternative implementation, such as Figure 2 As shown, the energy storage module includes an energy storage battery module and a DC-DC power supply module. The input terminal of the energy storage battery module is connected to the second output terminal of the first switching module, the output terminal of the energy storage battery module is connected to the input terminal of the DC-DC power supply module, and the output terminal of the DC-DC power supply module is connected to the input terminal of the second switching module.

[0073] Specifically, the energy storage battery module stores the DC power converted by the ACDC power module. The DCDC power module converts the unstable DC power output from the energy storage battery module into constant current / constant voltage DC power that meets the charging requirements of new energy vehicles, and can adjust the output power according to the control module's instructions.

[0074] In one alternative implementation, the grid-side load constraint and dynamic power adaptive regulation system is designed as follows:

[0075] The transformer on the grid side outputs 380V alternating current with a rated power of Pt, and two types of loads are connected to its lower end: an integrated energy storage and charging device (rated input power Pp) and other electrical loads (input power Po). The system operation must strictly follow the core constraint inequality: Pp + Po < Pt.

[0076] If Pp + Po ≥ Pt, it will directly trigger the risk of grid overload. In the light case, the protection mechanism will be triggered, resulting in tripping and power outage, affecting normal power consumption. In the severe case, overheating will be caused by the long-term overloaded operation of the line, posing a hidden danger of electrical fire.

[0077] Affected by the characteristics of users' electricity consumption behavior, the power Po of other loads has significant time-varying characteristics, which leads to two typical contradictions:

[0078] (1) Peak load scenario: Scenarios such as concentrated lighting at night, the start-up of air-conditioning clusters in summer, and the operation of high-power kitchen utensils during the three meals will cause Po to rise significantly in a short period of time. If the integrated energy storage and charging device maintains the original power Pp unchanged, it is very easy to出现 Pp + Po > Pt, breaking through the safety constraint and triggering the aforementioned overload risk.

[0079] (2) Valley load scenario: When Po drops (such as the shutdown of night lighting and the deactivation of air conditioners), if the integrated energy storage and charging device still maintains the previously reduced Pp to avoid overload, it will result in Pp + Po being much less than Pt, causing the idle of the transformer capacity.

[0080] To resolve the above contradictions, a power following control system based on real-time monitoring is designed, and two-way optimization is achieved through the following mechanisms:

[0081] As Figure 3 shown, a current sensor is deployed at the output end of the transformer to collect the total load power Pp + Po in real time. After receiving the sensor data, the control module dynamically adjusts the power of the AC / DC power module of the integrated energy storage and charging device to make Pp and Po form a dynamic match.

[0082] Overload prevention: When it is detected that Pp + Po > P (where P is a preset safety threshold and P is much less than Pt), the control module immediately issues a power reduction instruction to the AC / DC power module, adjusts Pp to Pp = P - Po, and ensures Pp + Po < Pt, avoiding the overload risk from the source.

[0083] Energy efficiency improvement: When it is detected that Pp + Po < P, the control module issues a power increase instruction to the AC / DC power module, increases Pp to Pp = P - Po, and under the premise of strictly satisfying Pp + Po < Pt, enables the integrated energy storage and charging pile to make full use of the redundant capacity of the transformer and avoid resource idleness.

[0084] Seamless switching: By optimizing the instruction transmission and module response mechanism, rapid response (<200ms) of power regulation is achieved, completely solving the problem of lag in supply-demand imbalance in the traditional manual adjustment mode and ensuring power supply continuity.

[0085] Taking a transformer with a rated power Pt = 100kW as an example in a specific embodiment, the system operation process is as follows:

[0086] Normal scenario: There is no centralized lighting during the day, and other loads Po = 0kW. The current sensor monitors that Pp + Po = 80kW < P (preset P = 90kW). The control module allows the AC / DC power module to operate at full power of 80kW, making full use of the transformer capacity.

[0087] Peak load scenario: Lighting and other equipment are turned on at night, Po = 30kW. If the AC / DC still operates at 80kW, the total load will reach 110kW (>100kW). At this time, the current sensor captures in real time that Pp + Po = 110kW > P. The control module immediately instructs the AC / DC to reduce the power to 70kW, so that the total load is reduced to below 100kW (70kW + 30kW = 100kW), meeting the safety constraints.

[0088] Valley recovery scenario: Lighting is turned off at night, Po = 0kW. The sensor monitors that Pp + Po = 70kW < P. The control module instructs the AC / DC to increase the power to 80kW, and the total load returns to 80kW, realizing the efficient utilization of the transformer capacity again.

[0089] In an optional implementation manner, the control module is further configured to adjust the charge-discharge logic according to the electricity storage instruction issued by the cloud.

[0090] Specifically, the charge-discharge logic includes:

[0091] Step S11, monitoring whether the integrated charge and storage charging device is in the vehicle charging state.

[0092] Step S12, when the integrated charge and storage charging device is not in the vehicle charging state, controlling the first switch module to close the circuit of the energy storage module and disconnect the circuit of the charging gun module, controlling the second switch module to disconnect the circuit of the charging gun module, starting the ACDC power module, and the integrated charge and storage charging device enters the electricity storage state.

[0093] Step S13, when the integrated charge and storage charging device is in the vehicle charging state, after the vehicle charging ends, returning to the step of monitoring whether the integrated charge and storage charging device is in the charging state again.

[0094] Step S14, monitoring whether there is a vehicle accessing and ready to charge the integrated charge and storage charging device.

[0095] Step S15: If a vehicle is connected to prepare for charging, pause the ACDC power module.

[0096] Step S16: Control the first switch module to disconnect the circuit of the energy storage module and close the circuit of the charging gun module, control the second switch module to close the circuit of the charging gun module, start the ACDC power module, and the integrated energy storage and charging device enters the charging state.

[0097] Step S17: After the vehicle has finished charging, recharge the battery.

[0098] In this embodiment of the invention, the cloud platform sends energy storage commands to the device based on grid load, energy storage module power requirements, and other needs. After receiving the command, the control module determines whether the device is currently charging the vehicle through signal feedback from the charging gun module. If the control module determines that the device is charging the vehicle, it will continuously track the charging process. After charging is completed, it will immediately return to step S11 to re-determine whether the device is in a charging state. If the control module determines that the device is not in a vehicle charging state, it controls the first switch module to close the circuit between the ACCDC power module and the energy storage module, and disconnect the circuit between the ACCDC power module and the charging gun module, ensuring that all the electrical energy of the ACCDC power module is used for energy storage and is not diverted to the idle charging gun; it controls the second switch module to disconnect the circuit between the energy storage module and the charging gun module to prevent the energy storage module from discharging to the charging gun during the energy storage process, thus ensuring energy storage efficiency.

[0099] The control module detects new vehicles needing charging in real time via the charging gun module's access signal. If a new vehicle is detected, the control module sends a pause command to the ACDC power module, temporarily stopping its power supply to the energy storage module. Then, it controls the first switch module to disconnect the circuit between the ACDC power module and the energy storage module, and close the circuit between the ACDC power module and the charging gun module; it also controls the second switch module to close the circuit between the energy storage module and the charging gun module, restoring power output and supplying DC power to the charging gun module. After charging is complete, the control module drives the device out of charging mode and re-executes step S12 to continue completing the energy storage task assigned by the cloud. See the energy storage and discharge flowchart. Figure 4 .

[0100] In one alternative implementation, the control module is also used to adjust the charging and discharging logic according to the peak-valley electricity price period instructions issued by the cloud.

[0101] Specifically, the charging and discharging logic includes:

[0102] Step S21: During off-peak hours, if a vehicle is charging, prioritize controlling the ACDC power module to directly draw power from the grid to supply power to the vehicle.

[0103] Step S22: If the vehicle's requested current is greater than the maximum output current of the ACDC power module and the remaining power of the energy storage module is greater than the second preset threshold, then the energy storage module is activated to supplement power supply.

[0104] Step S23: If no vehicle is charging, control the ACDC power module to operate at full power to charge the energy storage module to full capacity.

[0105] Step S24: During peak / off-peak power periods, if a vehicle is charging, the energy storage module is prioritized to supply power to the vehicle.

[0106] Step S25: If the vehicle's requested current is greater than the maximum output current of the energy storage module, start the ACDC power module to supplement the power supply.

[0107] In this embodiment of the invention, the cloud platform issues power generation time instructions or peak / off-peak time instructions to the equipment according to the local power grid peak-valley electricity pricing policy. When the cloud issues an off-peak time instruction and the control module detects a vehicle connecting for charging, it first issues a start instruction to the ACDC power module, controlling the ACDC power module to directly draw 380V AC power from the grid side, convert it to DC power, and then supply it to the charging gun module to power the vehicle. If the vehicle's charging request current is greater than the maximum output current of the ACDC power module (e.g., if the vehicle requires 160A, the ACDC power module can only output a maximum of 80A), and the control module detects that the remaining charge (SOC) of the energy storage module is greater than a second preset threshold, it immediately issues a closing instruction to the second switch module, starting the energy storage module to output DC power through the DCDC power module, which is superimposed with the output of the ACDC power module to jointly meet the vehicle's current demand. When the cloud sends out a peak electricity period command and the control module detects that no vehicle is connected, it sends a full-power operation command to the ACDC power module. At the same time, it controls the first switch module to close the energy storage module circuit and disconnect the charging gun module circuit, and controls the second switch module to disconnect the charging gun module circuit, so that all the DC power output from the ACDC power module is directed to the energy storage module until the energy storage module reaches full capacity (SOC=100%).

[0108] When the cloud sends a peak / off-peak electricity time period command and the control module detects a vehicle connecting for charging, it first sends a closing command to the second switch module to start the energy storage module, which outputs DC power through the DC-DC power module to power the vehicle. Simultaneously, it controls the first switch module to disconnect the energy storage module's charging circuit, preventing the AC-DC converter from drawing power from the grid. If the vehicle's charging request current exceeds the energy storage module's maximum output current (e.g., the vehicle requires 200A, but the energy storage module can only output a maximum of 120A through the DC-DC power module), the control module immediately sends a start command to the AC-DC power module and simultaneously controls the first switch module to close the charging gun module circuit, allowing the AC-DC power module to draw power from the grid and convert it to DC power, which is then added to the energy storage module's output to meet the vehicle's current requirements. This utilizes the peak / off-peak electricity price difference for energy storage and discharge, reducing charging costs and increasing equipment operating profits. In this embodiment, the second preset threshold is set according to the operating conditions.

[0109] In one optional implementation, the charge / discharge logic further includes:

[0110] Step S31: Monitor the charging request power of the vehicle in real time. If the charging request power is higher than the total power of the current working module for several consecutive times, determine whether the current period is a peak power / flat power period.

[0111] Step S32: If the current period is a peak power / flat power period, determine whether there are any idle DC-DC power modules.

[0112] Step S33: If there is an available DC-DC power module, start the DC-DC power module and let the energy storage module supply power to the vehicle.

[0113] Step S34: If there is no available DC-DC power module, determine if there is an available AC-DC power module.

[0114] Step S35: If there is an available ACCDC power module, start the ACCDC power module to supply power to the vehicle from the grid side.

[0115] Step S36: If the current power supply is not during peak / off-peak hours, determine if there are any available AC / DC power modules.

[0116] Step S37: If there is an available AC / CDC power module, start the AC / CDC power module to supply power to the vehicle from the grid side.

[0117] Step S38: If there is no available AC / DC power module, determine whether there is an available DC / DC power module.

[0118] Step S39: If there is an available DC-DC power module, start the DC-DC power module and let the energy storage module supply power to the vehicle.

[0119] Specifically, such as Figure 5 As shown, multiple AC-CDC power modules and DC-CDC power modules are configured, and the number can be increased or decreased according to actual power requirements to adapt to different scenarios. The charging gun module includes at least two independent charging guns: charging gun A and charging gun B. Each charging gun is equipped with an independent charging switch module, which is controlled by the control module to enable multiple vehicles to charge simultaneously or independently.

[0120] The control module also adjusts the number of working modules based on the requested charging power. If the requested charging power is higher than the total power of the current working modules multiple times, the number of ACDC or DCDC power modules in operation is increased. If the requested charging power is lower than the total power of the current working modules multiple times, the number of ACDC or DCDC power modules in operation is decreased. See the detailed adjustment flowchart. Figure 6 and Figure 7 .like Figure 6 As shown, the control module collects the charging request power sent by the vehicle in real time and counts whether the power of several consecutive requests exceeds the total power of the currently working modules. If so, it further determines whether it is currently in a peak / off-peak power period. Here, "several requests" is taken as 5 times, where the total power of the current working modules = the output power of the AC / CDC power module + the output power of the DC / DC power module. If it is currently in a peak / off-peak power period, the control module first checks if there are any idle DC / CDC power modules (e.g., if the equipment is configured with 3 DC / CDC modules, only 1 is currently working, and the remaining 2 are idle). If an idle DC / CDC power module exists, the control module sends a start command to that module. After start-up, the energy storage module outputs DC power through the DC / DC power module, which is added to the power of the existing working modules to meet the vehicle's charging request power. If all DC / CDC power modules are running, the control module checks if there are any idle AC / CDC power modules. If an idle AC / CDC power module exists, the control module starts that module, drawing power from the grid side, converting it to DC power through the AC / CDC power module, and then supplementing the power supply to meet the charging power requirements.

[0121] If it is currently off-peak electricity hours, the control module first checks for any idle AC / CDC power modules. If an idle AC / CDC power module is found, the control module activates it, drawing 380V AC power directly from the grid, converting it to DC power, and then using this DC power to supplement the vehicle's power supply. This DC power is then added to the power output of the existing operating modules to meet the vehicle's power request. If all AC / CDC power modules are running, the control module then checks for any idle DC / CDC power modules. If an idle DC / CDC power module is found, the control module activates it, and the energy storage module outputs DC power to supplement the charging power demand.

[0122] A specific embodiment uses a charging pile equipped with 3 DC / DC modules and 2 AC / DC modules. Each DC / DC module has a power output of 40kW, and each AC / DC module has a power output of 40kW, for a total power output of 200kW. During off-peak hours, the AC / DC modules are used preferentially, with the DC / DC modules serving as power compensation. Dynamic power allocation is shown in Table 1.

[0123] Table 1 Dynamic Allocation of Charging Power During Off-Peak Electricity Hours

[0124]

[0125] During peak / off-peak charging periods, DC / DC modules are used preferentially, with AC / DC modules used for power compensation. Dynamic power allocation is shown in Table 2.

[0126] Table 2 Dynamic Allocation of Charging Power During Peak / Peak Power Hours

[0127]

[0128] In one optional implementation, the charge / discharge logic further includes:

[0129] Step S41: If the power of several consecutive charging requests is lower than the total power of the current working module, then determine whether the current period is a peak power / flat power period.

[0130] Step S42: If the current period is a peak power / flat power period, determine whether there is an AC / DC power module in operation.

[0131] Step S43: If there is an AC / CDC power module in operation, control the AC / CDC power module to go into sleep mode.

[0132] Step S44: If there is no running AC / DC power module, determine whether there is a running DC / DC power module.

[0133] Step S45: If there is a running DC-DC power module, control the DC-DC power module to go into sleep mode.

[0134] Step S46: If the current power supply is not during peak / off-peak hours, determine whether there is a running DC-DC power module.

[0135] Step S47: If there is a running DC-DC power module, control the DC-DC power module to go into sleep mode.

[0136] Step S48: If there is no running DC-DC power module, determine whether there is a running AC-DC power module.

[0137] Step S49: If there is an AC / CDC power module in operation, control the AC / CDC power module to go into sleep mode.

[0138] Specifically, in Figure 7 The flowchart shown illustrates an example where five consecutive charging requests have a power output lower than the current working module's total power minus 40kW. The control module collects the charging request power sent by the vehicle in real time and checks whether the power output of five consecutive requests is lower than the current working module's total power minus 40kW. If so, it further determines whether the current period is peak / off-peak. If it is, the control module first checks if there are any running ACDC power modules. If there are running ACDC power modules, the control module issues a sleep command to one of them (e.g., reducing from two ACDC power modules to one, decreasing the total power from 80kW to 40kW), so that the total power of the working module matches the charging request power (e.g., if the vehicle requests 100kW, the original total power is 160kW, and after one ACDC power module is put into sleep mode, the total power is 120kW, close to the demand). If all ACDC power modules are in sleep mode, the control module then checks if there are any running DC-DC power modules. If a DC-DC converter is running, the control module puts one of them into sleep mode (e.g., reducing from 3 to 2, with the total power decreasing from 120kW to 80kW) to match the charging request power.

[0139] If it is currently off-peak electricity hours, the control module first checks if there are any running DC-DC power modules. If a running DC-DC power module exists, the control module sends a sleep command to one of them, matching the total power of the working modules with the requested charging power. If all DC-DC power modules are in sleep mode, the control module then checks if there are any running AC-DC power modules. If a running AC-DC power module exists, the control module puts one of them into sleep mode to match the requested charging power.

[0140] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A charging device integrating energy storage and charging, characterized in that, include: The system comprises a current sensor, an ACDC power supply module, a control module, a first switch module, a second switch module, an energy storage module, and a charging gun module. The input terminal of the current sensor is connected to the AC power grid, the first output terminal of the current sensor is connected to the input terminal of the AC / DC power module, the communication terminal of the current sensor is connected to the first terminal of the control module, the first output terminal of the AC / DC power module is connected to the input terminal of the first switch module, and the communication terminal of the AC / DC power module is connected to the second terminal of the control module. The first output terminal of the first switch module is connected to the first input terminal of the charging gun module, the second output terminal of the first switch module is connected to the input terminal of the energy storage module, and the communication terminal of the first switch module is connected to the third terminal of the control module. The input terminal of the second switch module is connected to the output terminal of the energy storage module, the output terminal of the second switch module is connected to the second input terminal of the charging gun module, and the communication terminal of the second switch module is connected to the fourth terminal of the control module. When the output power of the ACDC power module is less than the vehicle's requested power, the control module controls the first switch module to disconnect the circuit of the energy storage module and close the circuit of the charging gun module, while simultaneously controlling the second switch module to close the circuit of the charging gun module, thereby activating the energy storage module to supplement power supply. When the grid-side parameters exceed the first preset threshold, the control module sends a power reduction command to the ACDC power module to control it to reduce its output power; when the grid-side parameters are lower than the first preset threshold, the control module sends a power increase command to the ACDC power module to control it to increase its output power. The control module is also used to adjust the charging and discharging logic according to the peak and valley electricity price instructions issued by the cloud. The energy storage module includes: an energy storage battery module and a DC-DC power module, wherein... The input terminal of the energy storage battery module is connected to the second output terminal of the first switch module, the output terminal of the energy storage battery module is connected to the input terminal of the DC-DC power module, and the output terminal of the DC-DC power module is connected to the input terminal of the second switch module. The charging and discharging logic also includes: The charging request power of the vehicle is monitored in real time. If the charging request power is higher than the total power of the current working module for several consecutive times, it is determined whether the current period is peak power / flat power. If it is currently a peak power / flat power period, then determine if there are any idle DC-DC power modules; If there is an available DC-DC power module, then the DC-DC power module is activated, and the energy storage module supplies power to the vehicle. If there are no available DC-DC power modules, then check if there are any available AC-DC power modules. If an AC-CDC power module is available, activate the AC-CDC power module to supply power to the vehicle from the grid side. If it is not currently a peak / off-peak power period, then determine if there are any available AC / DC power modules; If an AC-CDC power module is available, activate the AC-CDC power module to supply power to the vehicle from the grid side. If there are no available AC / DC power modules, then determine if there are any available DC / DC power modules. If a DC-DC power module is available, it is activated, and the energy storage module supplies power to the vehicle.

2. The integrated charging and storage device according to claim 1, characterized in that, The control module is also used to adjust the charging and discharging logic according to the energy storage instructions issued by the cloud.

3. The integrated charging and storage device according to claim 2, characterized in that, The charging and discharging logic includes: Monitor whether the integrated charging and storage device is in the vehicle charging state; When the integrated energy storage and charging device is not in the vehicle charging state, the first switch module is controlled to close the circuit of the energy storage module and disconnect the circuit of the charging gun module, the second switch module is controlled to disconnect the circuit of the charging gun module, and the ACDC power module is started, so that the integrated energy storage and charging device enters the energy storage state. When the integrated charging and storage device is in the vehicle charging state, after the vehicle charging is completed, return to the step of monitoring whether the integrated charging and storage device is in the charging state.

4. The integrated charging and storage device according to claim 3, characterized in that, The charging and discharging logic also includes: Monitor whether a vehicle has connected to the integrated charging and storage device and is ready to charge; If a vehicle is connected to prepare for charging, the ACDC power module will be paused. The first switch module is controlled to disconnect the circuit of the energy storage module and close the circuit of the charging gun module, and the second switch module is controlled to close the circuit of the charging gun module, thereby starting the ACDC power module and putting the integrated energy storage and charging device into the charging state. After the vehicle finishes charging, it will recharge.

5. The integrated charging and storage device according to claim 2, characterized in that, The charging and discharging logic includes: During off-peak hours, if a vehicle is charging, the ACDC power module is prioritized to draw power directly from the grid to supply power to the vehicle. If the vehicle requests a current greater than the maximum output current of the ACDC power module and the remaining power of the energy storage module is greater than the second preset threshold, then the energy storage module is activated to supplement power supply. If no vehicle is charging, the AC / DC power module is controlled to operate at full power to charge the energy storage module to full capacity.

6. The integrated charging and storage device according to claim 5, characterized in that, The charging and discharging logic also includes: During peak / off-peak power periods, if a vehicle is charging, the energy storage module will be prioritized to supply power to the vehicle. If the vehicle requests a current greater than the maximum output current of the energy storage module, the AC-CDC power module will be activated to supplement the power supply.

7. The integrated charging and storage device according to claim 1, characterized in that, The charging and discharging logic also includes: If the power of several consecutive charging requests is lower than the total power of the current working module, then determine whether the current period is a peak power / flat power period; If it is currently a peak power / off power period, determine whether there are any operating AC / DC power modules; If there is an AC / DC power module in operation, control the AC / DC power module to go into sleep mode; If there is no running AC / DC power module, then determine whether there is a running DC / DC power module. If a DC-DC power module is running, control the DC-DC power module to go into sleep mode.

8. The integrated charging and storage device according to claim 7, characterized in that, The charging and discharging logic also includes: If it is not currently a peak / off-peak power period, then determine whether there is a running DC-DC power module; If there is a running DC-DC power module, control the DC-DC power module to hibernate; If there is no running DC-DC power module, then determine whether there is a running AC-DC power module. If there is an AC / CDC power module in operation, control the AC / CDC power module to go into sleep mode.

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