Energy storage charging piles and energy storage charging systems
By introducing a switch module and a control module into the energy storage charging pile, the connection structure between the DC-DC converter and the energy storage battery can be flexibly adjusted, solving the problem of low power conversion efficiency of the energy storage charging pile and realizing efficient high-power charging of electric vehicles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAN LINCHR NEW ENERGY TECH CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-17
AI Technical Summary
Existing energy storage charging piles have low power conversion efficiency and cannot meet the high-power charging needs of electric vehicle supercharging models.
By introducing switch modules and control modules into energy storage charging piles, the series or parallel connection structure between DC-DC converters and energy storage batteries can be flexibly adjusted, and the switching on and off can be controlled according to the charging needs of electric vehicles, thereby improving power conversion efficiency.
It improves the power conversion efficiency of energy storage charging piles, meets the high-power charging needs of electric vehicle supercharging models, and achieves more efficient use of electrical energy.
Smart Images
Figure CN224510915U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of energy storage and charging technology, and more specifically, to an energy storage charging pile and an energy storage charging system. Background Technology
[0002] In recent years, the influx of supercharging vehicles into the market has led to a significant increase in the demand for high-power charging of electric vehicles. However, the current power distribution network capacity for energy storage charging stations is limited, insufficient to support the high-power charging needs of supercharging vehicles, thus restricting the installed charging capacity of electric vehicles. Therefore, it is urgent to expand the energy storage charging capacity of energy storage charging stations to meet the high-power charging requirements of supercharging vehicles.
[0003] In related technologies, the charging power of energy storage charging piles is generally expanded by cascading AC-DC converters and DC-DC converters. This mainly involves adding an energy storage battery at the midpoint between the AC-DC and DC-DC converters to extend the capacity of the DC-DC converter, thereby enabling high-power charging of the energy storage charging pile.
[0004] However, when charging electric vehicles using related technologies, there is a problem of low power conversion efficiency. Utility Model Content
[0005] The purpose of this application is to provide an energy storage charging pile and an energy storage charging system, which can improve the conversion efficiency of the energy storage charging pile to meet the high-power charging needs of supercharging vehicles.
[0006] The embodiments of this application are implemented as follows: A first aspect of this application provides an energy storage charging pile, which includes: a control module, an AC-DC converter, a DC-DC converter, and a switch module, wherein the switch module includes a plurality of switches. The input terminal of the AC-DC converter is used to connect to the AC power grid. The positive output terminal of the AC-DC converter is connected to the positive terminal of the energy storage battery and the positive input terminal of the DC-DC converter, respectively. The negative output terminal of the AC-DC converter is connected to the negative terminal of the energy storage battery and the negative input terminal of the DC-DC converter, respectively. The first terminal of the switching module is connected to the energy storage battery, the positive output terminal of the DC-DC converter is connected to the second terminal of the switching module, the negative output terminal of the DC-DC converter is connected to the third terminal of the switching module, and the switching module is connected to the charging port of an external device via a charging gun. The switching module is used to adjust the series or parallel connection between the energy storage battery and the DC-DC converter so that the output voltage of the energy storage charging pile meets the target charging requirements of the external device.
[0007] As one possible implementation, the above-mentioned switch module includes: a first switch and a second switch; The input terminal of the first switch is connected to the positive output terminal of the DC-DC converter, and the output terminal of the first switch is connected to the charging gun. The input terminal of the second switch is connected to the negative output terminal of the DC-DC converter, and the output terminal of the second switch is connected to the charging gun. When both the first and second switches are closed, the energy storage battery and the DC-DC converter form a parallel structure, and the output voltage of the energy storage charging pile is equal to the output voltage of the DC-DC converter.
[0008] As one possible implementation, the aforementioned switch module also includes: a third switch and a fourth switch; The input terminal of the third switch is connected to the positive terminal of the energy storage battery and the positive input terminal of the DC-DC converter, and the output terminal of the third switch is connected to the negative output terminal of the DC-DC converter and the input terminal of the second switch. The input terminal of the fourth switch is connected to the negative terminal of the energy storage battery and the negative input terminal of the DC-DC converter, and the output terminal of the fourth switch is connected to the charging gun.
[0009] As one possible implementation, when both the first and second switches are closed and both the third and fourth switches are open, the energy storage battery and the DC-DC converter form a parallel structure, and the output voltage of the energy storage charging pile is equal to the output voltage of the DC-DC converter.
[0010] As one possible implementation, when all the second switches are open and the first, third, and fourth switches are closed, the energy storage battery and the DC-DC converter form a series structure, and the output voltage of the energy storage charging pile is equal to the sum of the output voltage of the energy storage battery and the output voltage of the DC-DC converter.
[0011] As one possible implementation, the aforementioned switch module also includes a fourth switch and a sixth switch; The input terminal of the fourth switch is connected to the negative terminal of the energy storage battery and the negative input terminal of the DC-DC converter, and the output terminal of the fourth switch is connected to the charging gun. The input terminal of the sixth switch is connected to the positive terminal of the energy storage battery and the positive input terminal of the DC-DC converter, and the output terminal of the sixth switch is connected to the positive output terminal of the DC-DC converter and the input terminal of the first switch.
[0012] As one possible implementation, the aforementioned switch module also includes: a fifth switch; The input terminal of the fifth switch is connected to the negative output terminal of the DC-DC converter, and the output terminal of the fifth switch is connected to the charging gun.
[0013] As one possible implementation, when the first and second switches are both closed and the fourth, fifth, and sixth switches are all open, the energy storage battery and the DC-DC converter form a parallel structure, and the output voltage of the energy storage charging pile is equal to the output voltage of the DC-DC converter.
[0014] As one possible implementation, when the first and second switches are both open and the fourth, fifth, and sixth switches are all closed, the energy storage battery and the DC-DC converter form a series structure, and the output voltage of the energy storage charging pile is equal to the difference between the output voltage of the energy storage battery and the output voltage of the DC-DC converter.
[0015] A second aspect of this application provides an energy storage charging system, which includes: the energy storage charging pile and the energy storage battery described in the first aspect above.
[0016] The beneficial effects of the embodiments of this application include: This application provides an energy storage charging pile, which comprises a control module, an AC-DC converter, a DC-DC converter, and a switch module. The switch module includes multiple switches. The input terminal of the AC-DC converter is connected to AC power supplied by the AC grid, and the output terminal of the AC-DC converter and the positive and negative terminals of the energy storage battery are both connected to the primary side of the DC-DC converter. The first terminal of the switch module is connected to the energy storage battery, the second terminal is connected to the positive output terminal of the DC-DC converter, and the third terminal is connected to the negative output terminal of the DC-DC converter. The switch module is connected to external devices via a charging gun. The control module is connected to the charging gun and the control terminals of each switch in the switch module. The control module acquires the target charging demand of the external device connected to the charging gun in real time and controls the on / off state of each switch in the switch module according to the target charging demand, thereby changing the connection point of the energy storage battery in the main power circuit of the energy storage charging pile and improving the power conversion efficiency of the energy storage charging pile. This achieves the effect of improving the conversion efficiency of the energy storage charging pile to meet the high-power charging needs of supercharging vehicles. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the circuit topology of an existing energy storage charging pile. Figure 2This application provides a schematic diagram of the structure of a first type of energy storage charging pile; Figure 3 This is a schematic diagram of a cascaded structure of an existing DC-DC converter; Figure 4 This is a connection diagram of a DC-DC converter provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a second type of energy storage charging pile provided in an embodiment of this application; Figure 6 A control timing diagram of a control module provided in an embodiment of this application; Figure 7 This is a structural schematic diagram of the third type of energy storage charging pile provided in the embodiments of this application; Figure 8 A control timing diagram for another control module provided in an embodiment of this application; Figure 9 This is a schematic diagram of an energy storage and charging system provided in an embodiment of this application.
[0019] Reference numerals: 10: Energy storage charging pile; 101: Control module; 102: AC-DC converter; 103: DC-DC converter; 104: Switch module; 1041: First switch; 1042: Second switch; 1043: Third switch; 1044: Fourth switch; 1045: Fifth switch; 1046: Sixth switch; 20: Energy storage battery; 30: Energy storage charging system. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0023] In the description of this application, it should be noted that the terms "first," "second," "third," "fourth," "fifth," and "sixth," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0024] Currently, adding an energy storage battery between the AC-DC converter and the DC-DC converter increases the capacity of the DC-DC converter, thereby expanding the charging power of the energy storage charging pile to meet the high-power charging needs of supercharging vehicles. However, this solution generates charging voltage through a two-stage operation mode of the AC-DC converter and the DC-DC converter, resulting in low energy conversion efficiency, which in turn leads to low power conversion efficiency of the energy storage charging pile.
[0025] To address this, this application provides an energy storage charging pile. By adding a switching switch to the switching module, the control module collects the target charging demand of the electric vehicle to be charged and controls the on / off state of each switch to flexibly adjust the cascaded structure between the DC-DC converter and the energy storage battery. This changes the connection point of the energy storage battery on the main power circuit of the energy storage charging pile, thereby improving the power conversion efficiency of the energy storage charging pile and meeting the high-power charging needs of supercharging vehicles. In this way, the conversion efficiency of the energy storage charging pile can be improved to meet the high-power charging requirements of supercharging vehicles.
[0026] Figure 1 Here is a schematic diagram of the circuit topology of an existing energy storage charging pile. (See attached diagram) Figure 1 Typically, AC-DC converters are connected to the AC power supplied by the distribution network. These converters then convert the received AC power into corresponding DC power. Furthermore, adding an energy storage battery between the AC-DC and DC-DC converters increases the DC power applied to the input of the DC-DC converter, allowing it to provide more power. However, this approach primarily relies on AC-DC converters and cascaded DC-DC converters to achieve power conversion for energy storage charging piles, which significantly reduces the power conversion efficiency of the charging piles.
[0027] The energy storage charging pile provided in the embodiments of this application will be explained in detail below with reference to the accompanying drawings.
[0028] It is worth noting that, Figure 2 , Figure 5 as well as Figure 6 In this diagram, BAT+ refers to the positive output voltage of the energy storage battery 20, BAT- refers to the negative output voltage of the energy storage battery 20, DC+ refers to the positive output voltage of the secondary side of the DC-DC converter 103, and DC- refers to the negative output voltage of the secondary side of the DC-DC converter 103. S1 is used to indicate the first switch 1041, S2 is used to indicate the second switch 1042, S3 is used to indicate the third switch 1043, S4 is used to indicate the fourth switch 1044, S5 is used to indicate the fifth switch 1045, S6 is used to indicate the sixth switch 1046, EV+ is used to indicate the positive charging voltage provided by the energy storage charging pile 10, and EV- is used to indicate the negative charging voltage provided by the energy storage charging pile 10.
[0029] Figure 2 This application provides a structural schematic diagram of an energy storage charging pile, see [link / reference]. Figure 2 The energy storage charging pile 10 provided in this application embodiment includes: a control module 101, an AC-DC converter 102, a DC-DC converter 103, and a switch module 104, wherein the switch module 104 includes a plurality of switches.
[0030] Optionally, the control module 101 can be implemented by a controller. As the core component of the energy storage charging pile 10, the control module 101 is connected to the control terminals of each switch in the switch module 104. Simultaneously, the control module 101 is also connected to the charging gun. The control module 101 obtains the charging requirements of the electric vehicle connected to the charging gun via the charging gun and adjusts the on / off states of each switch according to the charging requirements, so that the energy storage charging pile 10 can stably and reliably charge the electric vehicle. It is worth noting that the charging gun is an external component of the energy storage charging pile 10. The user inserts the charging gun into the charging port of the electric vehicle, and the energy storage charging pile 10 supplies power to the electric vehicle through the charging gun.
[0031] Optionally, the operation control strategy of the control module 101 considers not only conversion efficiency but also the cost-effectiveness of power supply. For example, when the time-of-use electricity price is high, the control module 101 controls the AC-DC converter 102 to reduce its operating power. At this time, the energy storage battery 20 is prioritized to discharge. When the energy provided by the energy storage battery 20 is less than the charging demand of the electric vehicle, the AC-DC converter 102 further supplements to meet the charging demand of the electric vehicle, thereby maximizing economic benefits. Conversely, when the time-of-use electricity price is low, the control module 101 prioritizes driving the AC-DC converter 102 to convert the AC power provided by the AC grid into DC power. If the operating power of the AC-DC converter 102 is less than the charging demand of the electric vehicle, the energy storage battery 20 further discharges. Conversely, when the operating power of the AC-DC converter 102 is higher than the power required for charging the electric vehicle, the energy storage battery 20 starts to charge to consume the excess charge.
[0032] It is worth noting that the energy storage battery 20 can be either a built-in energy storage battery of the energy storage charging pile 10 or an external battery of the energy storage charging pile 10. This application does not make any specific limitation on this.
[0033] The input terminal of the AC-DC converter 102 is used to connect to the AC power grid. The positive output terminal of the AC-DC converter 102 is connected to the positive terminal of the energy storage battery 20 and the positive input terminal of the DC-DC converter 103, respectively. The negative output terminal of the AC-DC converter 102 is connected to the negative terminal of the energy storage battery 20 and the negative input terminal of the DC-DC converter 103, respectively.
[0034] Optionally, the AC-DC converter 102 is used to connect to the AC power supplied by the AC power grid and convert the AC power supplied by the AC power grid into DC power for transmission to the energy storage battery 20 and the DC-DC converter 103. At the same time, the energy storage battery 20 can also provide stable and reliable DC power to the DC-DC converter 103 to expand the power capacity of the DC-DC converter 103.
[0035] The first terminal of the switch module 104 is connected to the energy storage battery 20, the positive output terminal of the DC-DC converter 103 is connected to the second terminal of the switch module 104, the negative output terminal of the DC-DC converter 103 is connected to the third terminal of the switch module 104, and the switch module 104 is connected to the charging port of an external device via a charging gun.
[0036] Optionally, the first end of the switch module 104 is connected to the energy storage battery 20. The connection point of the energy storage battery 20 to the AC-DC converter 102 and the DC-DC converter 103 can be changed through the first end of the switch module 104, so as to change the connection relationship between the energy storage battery 20 and the DC-DC converter 103.
[0037] Optionally, the positive output terminal of the DC-DC converter 103 is connected to the second terminal of the switching module 104, and the negative output terminal of the DC-DC converter 103 is connected to the third terminal of the switching module 104. The voltage output by the DC-DC converter 103 is transmitted to the charging gun via the switching module 104 to power the electric vehicle.
[0038] The external device can be any type of electric vehicle. When the user plugs the charging gun of the energy storage charging pile 10 into the charging port of the electric vehicle, the energy storage charging pile 10 begins to detect the charging needs of the electric vehicle and provides the corresponding charging voltage to the electric vehicle.
[0039] It is worth noting that the first, second, and third terminals of the switch module 104 are all input terminals of the switch module. The first terminal is used to connect to the voltage provided by the energy storage battery 20, the second terminal is used to connect to the positive output voltage of the DC-DC converter 103, and the third terminal is used to connect to the negative output voltage of the DC-DC converter. The switch module 104 applies the output voltage to the electric vehicle through the charging gun to complete the charging.
[0040] The switch module 104 is used to adjust the series or parallel structure between the energy storage battery 20 and the DC-DC converter 103 so that the output voltage of the energy storage charging pile 10 meets the target charging requirements of the external device.
[0041] Optionally, the target charging demand refers to the actual amount of charging required by the electric vehicle currently connected to the charging gun of the energy storage charging pile 10. The control module 101 obtains the target charging demand of the external device through the charging gun and controls the on / off state of each switch in the switch module 104 according to the target charging demand, so that the circuit structure composed of the energy storage battery 20 and the DC-DC converter 103 can meet the target charging demand of the electric vehicle.
[0042] In this configuration, the series structure refers to the energy storage battery 20 being connected in series with the secondary side of the DC-DC converter 103, while the parallel structure refers to the energy storage battery 20 being connected in parallel with the primary side of the DC-DC converter 103. When the target charging demand of the electric vehicle exceeds the preset voltage range, the control module 101 controls the switching of each switch in the switch module 104 to form a series structure between the energy storage battery 20 and the secondary side of the DC-DC converter 103. Conversely, when the target charging demand of the electric vehicle is lower than the preset voltage range, the control module 101 controls the switching of each switch in the switch module 104 to form a parallel structure between the energy storage battery 20 and the primary side of the DC-DC converter 103, allowing the energy storage charging pile 10 to directly output power based on the secondary side of the DC-DC converter 103. It is worth noting that the preset voltage range can be the supply voltage value of the energy storage battery or half of the supply voltage value of the energy storage battery; this application does not specifically limit this.
[0043] For example, if the voltage threshold of the energy storage battery 20 is 600V and the preset voltage range is 300V, then when the charging voltage required by the electric vehicle A is above 300V, the control module 101 controls each switch in the switch module 104 to form a series structure between the energy storage battery 20 and the secondary side of the DC-DC converter 103, and the energy storage charging pile 10 charges the electric vehicle A through the energy storage battery 20 and the DC-DC converter 103; when the charging voltage required by the electric vehicle A is below 300V, the control module 101 controls each switch in the switch module 104 to form a parallel structure between the energy storage battery 20 and the primary side of the DC-DC converter 103, and the energy storage charging pile 10 directly outputs the supply voltage through the secondary side of the DC-DC converter 103.
[0044] In this embodiment, an energy storage charging pile is composed of a control module, an AC-DC converter, a DC-DC converter, and a switching module. The switching module includes multiple switches. The input terminal of the AC-DC converter is connected to AC power supplied by the AC grid, and the output terminal of the AC-DC converter and the positive and negative terminals of the energy storage battery are both connected to the primary side of the DC-DC converter. The first terminal of the switching module is connected to the energy storage battery, the second terminal is connected to the positive output terminal of the DC-DC converter, and the third terminal is connected to the negative output terminal of the DC-DC converter. The switching module is connected to external devices via a charging gun. The control module is connected to the charging gun and the control terminals of each switch in the switching module. The control module acquires the target charging demand of the external device connected to the charging gun in real time and controls the on / off state of each switch in the switching module according to the target charging demand, thereby changing the connection point of the energy storage battery in the main power circuit of the energy storage charging pile and improving the power conversion efficiency of the energy storage charging pile. This achieves the effect of improving the conversion efficiency of the energy storage charging pile to meet the high-power charging needs of supercharging vehicles.
[0045] Figure 3 See the schematic diagram of a cascaded structure of an existing DC-DC converter. Figure 3 In existing energy storage charging piles, the primary side of the DC-DC converter (usually composed of DC-AC converter, AC-AC isolation transformer, and AC-DC converter) is connected in parallel with the preceding energy storage battery. The voltage output by the energy storage battery and the voltage output by the AC-DC converter are both used as the primary input voltage of the DC-DC converter. The energy storage charging pile can only provide charging power to external electric vehicles through the secondary side of the DC-DC converter.
[0046] Figure 4 See the connection diagram of a DC-DC converter provided in this application. Figure 4The energy storage charging pile 10 provided in this application embodiment can not only supply power to external electric vehicles through the secondary side of the DC-DC converter 103, such as the output terminal out of the DC-DC converter 103 being directly connected to the charging port EV of the external electric vehicle; it can also supply power to external electric vehicles by combining the DC-DC converter 103 with the energy storage battery 20. When the energy storage battery 20 supplies power to the electric vehicle, it does not need to go through the DC-DC converter 103 for power conversion, which can improve the power conversion efficiency. For example, the output terminal out1 of the DC-DC converter 103 is connected in series with the energy storage battery 20 to form the output terminal ou2 of the DC-DC converter 103 connected to the charging port EV of the external electric vehicle.
[0047] In one alternative implementation, see [link to implementation details]. Figure 5 The switch module 104 in the energy storage charging pile 10 provided in this application embodiment includes: a first switch 1041, a second switch 1042, a third switch 1043 and a fourth switch 1044.
[0048] The input terminal of the first switch 1041 is connected to the positive output terminal of the DC-DC converter 103, and the output terminal of the first switch 1041 is connected to the charging gun. The input terminal of the second switch 1042 is connected to the negative output terminal of the DC-DC converter 103 and the output terminal of the third switch 1043, respectively. The output terminals of the second switch 1042 and the fourth switch 1044 are both connected to the charging gun. The input terminal of the third switch 1043 is connected to the positive terminal of the energy storage battery 20, and the positive terminal of the fourth switch 1044 is connected to the negative terminal of the energy storage battery 20.
[0049] Optionally, the positive voltage of the energy storage battery 20 is changed to the negative output terminal of the secondary side of the DC-DC converter 103 by the third switch 1043, and the negative voltage of the energy storage battery 20 is changed to the negative output terminal of the secondary side of the DC-DC converter 103 by the fourth switch 1044.
[0050] In one alternative implementation, see [link to implementation details]. Figure 5 When the first switch 1041 and the second switch 1042 are both closed, and the third switch 1043 and the fourth switch 1044 are both open, the energy storage battery 20 and the DC-DC converter 103 form a parallel structure, and the output voltage of the energy storage charging pile 10 is equal to the output voltage of the DC-DC converter 103.
[0051] Optionally, when the first switch 1041 and the second switch 1042 are both closed, and the third switch 1043 and the fourth switch 1044 are both open, the connection point of the energy storage battery 20 in the main power circuit of the energy storage charging pile 10 does not change. The energy storage battery 20 and the primary side of the DC-DC converter 103 form a parallel structure. The energy storage charging pile 10 supplies power to the external electric vehicle only through the secondary output voltage of the DC-DC converter 103. That is, the output voltage of the energy storage charging pile 10 is U_EV = U_DCDC, where U_EV is used to indicate the output voltage of the energy storage charging pile 10, and U_DCDC is used to indicate the secondary output voltage of the DC-DC converter 103.
[0052] When the second switch 1042 is open and the first switch 1041, the third switch 1043 and the fourth switch 1044 are all closed, the energy storage battery 20 and the DC-DC converter 103 form a series structure, and the output voltage of the energy storage charging pile 10 is equal to the sum of the output voltage of the energy storage battery 20 and the output voltage of the DC-DC converter 103.
[0053] Optionally, when the second switch 1042 is open, the first switch 1041 is closed, and the third switch 1043 and the fourth switch 1044 are both closed, the energy storage battery 20 is connected in series with the secondary side of the DC-DC converter 103, and the output voltage of the energy storage charging pile 10 is U_EV = U_BAT + U_DCDC, where U_BAT is used to indicate the battery voltage of the energy storage battery 20.
[0054] Optionally, when the second switch 1042 is open and both the third switch 1043 and the fourth switch 1044 are closed, the voltage at the negative output terminal of the secondary side of the DC-DC converter 103 is the positive voltage of the energy storage battery 20, and the negative power supply port of the charging gun is the negative voltage of the energy storage battery 20; when the first switch is closed, the positive output voltage of the secondary side of the DC-DC converter 103 is U_DCDC, that is, the output voltage U_EV of the energy storage charging pile 10 is U_BAT + U_DCDC, where U_DCDC is used to indicate the positive output voltage of the DC-DC converter 103, and U_BAT is used to indicate the negative voltage of the energy storage battery 20.
[0055] In one possible implementation, if the control module 101 determines that the target charging demand U_EV is greater than the upper limit value U_uplmt of the switching of the third switch 1043 and the fourth switch 1044, then it controls the first switch 1041, the third switch 1043 and the fourth switch 1044 to close, and controls the second switch 1042 to open; otherwise, it controls the first switch 1041 and the second switch 1042 to close, and controls the third switch 1043 and the fourth switch 1044 to open.
[0056] Figure 6A control timing diagram for a control module provided in this application is shown below. Figure 6 , Figure 6 The control logic of the energy storage charging pile 10 is as follows: Step 1: The control module 101 obtains the target demand voltage U_EV of the external device through the charging gun, and obtains the switching limit U_uplmt of the third switch S3 and the fourth switch S4; Step 2: Determine whether the target demand voltage of the electric vehicle exceeds the switching limit of the third switch S3 and the fourth switch S4; Step 3: If yes, control the first switch S1, the third switch S3 and the fourth switch S4 to close, and control the second switch S2 to open, so that the energy storage battery 20 and the secondary side of the DC-DC converter 103 form a series structure; Step 4: If no, control the first switch S1 and the second switch S2 to close, and control the third switch S3 and the fourth switch S4 to open, so that the energy storage battery 20 and the primary side of the DC-DC converter 103 form a parallel structure, and the energy storage charging pile 10 outputs the power supply voltage through the secondary side of the DC-DC converter 103.
[0057] It is worth noting that the switching values of the third switch S3 and the fourth switch S4 can be dynamically adjusted, and this application does not impose specific limitations on this.
[0058] In one alternative implementation, see [link to implementation details]. Figure 7 The switch module 104 in the energy storage charging pile 10 provided in this application embodiment includes: a first switch 1041, a second switch 1042, a fourth switch 1044, a fifth switch 1045, and a sixth switch 1046.
[0059] The input terminal of the first switch 1041 is connected to the positive output terminal of the DC-DC converter 103 and the output terminal of the sixth switch 1046. The output terminals of the first switch 1041 and the fifth switch 1045 are both connected to the charging gun. The input terminals of the second switch 1042 and the fifth switch 1045 are both connected to the negative output terminal of the DC-DC converter 103, and the output terminals of the second switch 1042 and the fourth switch 1044 are both connected to the charging gun. The input terminal of the sixth switch 1046 is connected to the positive terminal of the energy storage battery 20, and the positive terminal of the fourth switch 1044 is connected to the negative terminal of the energy storage battery 20.
[0060] Optionally, the input terminal of the sixth switch 1046 is connected to the positive terminal of the energy storage battery 20, and the output terminal of the sixth switch 1046 is connected to the positive output terminal of the DC-DC converter 103 and the input terminal of the first switch 1041. The sixth switch 1046 is used to change the positive voltage point of the energy storage battery 20 to the positive output terminal of the secondary side of the DC-DC converter 103.
[0061] Optionally, the input terminal of the fifth switch 1045 is connected to the negative output terminal of the secondary side of the DC-DC converter 103, and the output terminals of the fifth switch 1045 and the first switch 1041 are both connected to the positive power supply port of the charging gun.
[0062] Optionally, the input terminal of the fourth switch 1044 is connected to the negative terminal of the energy storage battery 20, and the output terminals of the fourth switch 1044 and the second switch 1042 are both connected to the negative power supply port of the charging gun. The fourth switch 1044 is used to change the negative voltage point of the energy storage battery 20 to the negative power supply port of the charging gun.
[0063] In one alternative implementation, see [link to implementation details]. Figure 7 When the first switch 1041 and the second switch 1042 are both closed, and the fourth switch 1044, the fifth switch 1045 and the sixth switch 1046 are all open, the energy storage battery 20 and the DC-DC converter 103 form a parallel structure, and the output voltage of the energy storage charging pile 10 is equal to the output voltage of the DC-DC converter 103.
[0064] Optionally, when the first switch 1041 and the second switch 1042 are both closed, and the fourth switch 1044, the fifth switch 1045 and the sixth switch 1046 are all open, the connection point of the energy storage battery 20 in the main power circuit of the energy storage charging pile 10 does not change. The energy storage battery 20 and the primary side of the DC-DC converter 103 form a parallel structure. The energy storage charging pile 10 supplies power to the external electric vehicle only through the secondary output voltage of the DC-DC converter 103. That is, the output voltage of the energy storage charging pile 10 is U_EV = U_DCDC, where U_EV is used to indicate the output voltage of the energy storage charging pile 10, and U_DCDC is used to indicate the secondary output voltage of the DC-DC converter 103.
[0065] When the first switch 1041 and the second switch 1042 are both open, and the fourth switch 1044, the fifth switch 1045 and the sixth switch 1046 are all closed, the energy storage battery 20 and the DC-DC converter 103 form a series structure, and the output voltage of the energy storage charging pile 10 is equal to the difference between the output voltage of the energy storage battery 20 and the output voltage of the DC-DC converter 103.
[0066] Optionally, when the first switch 1041 and the second switch 1042 are both open, and the fourth switch 1044, the fifth switch 1045 and the sixth switch 1046 are all closed, the energy storage battery 20 is connected in series with the secondary side of the DC-DC converter 103, and the output voltage of the energy storage charging pile 10 is U_EV = U_BAT -U_DCDC.
[0067] It is worth noting that when the fourth switch 1044 is closed, the negative voltage of the energy storage battery 20 serves as the negative output terminal of the secondary side of the DC-DC converter 103; when the fifth switch 1045 is closed, the negative output voltage of the DC-DC converter 103 is transferred to the positive power supply port of the charging gun; and when the sixth switch 1046 is closed, the positive voltage of the energy storage battery 20 is transferred to the positive output terminal of the DC-DC converter 103.
[0068] In one optional implementation, if the control module 101 determines that the target charging demand U_EV is greater than the upper limit value U_uplmt of the switching of the fourth switch 1044, the fifth switch 1045, and the sixth switch 1046, or the target charging demand U_EV is less than the lower limit value U_downlmt of the switching of the fourth switch 1044, the fifth switch 1045, and the sixth switch 1046, then the first switch 1041 and the second switch 1042 are both closed, and the fourth switch 1044, the fifth switch 1045, and the sixth switch 1046 are all opened; otherwise, the fourth switch 1044, the fifth switch 1045, and the sixth switch 1046 are all closed, and the first switch 1041 and the second switch 1042 are all opened.
[0069] Figure 8 For a control timing diagram of another control module provided in this application, see [link to diagram]. Figure 8 , Figure 8 The control logic of the energy storage charging pile 10 is as follows: Step 1: The control module 101 obtains the target demand voltage U_EV of the external device through the charging gun, and obtains the upper limit value U_uplmt and the lower limit value U_downlmt of the fourth switch S4, the fifth switch S5 and the sixth switch S6; Step 2: Determine whether the target demand voltage of the electric vehicle exceeds the upper limit value U_uplmt of the fourth switch S4, the fifth switch S5 and the sixth switch S6, or determine whether the target demand voltage of the electric vehicle is lower than the lower limit value U_downlmt of the fourth switch S4, the fifth switch S5 and the sixth switch S6; Step 3: If so, control the first Step 4: If not, control the first switch S1 and the second switch S2 to be closed, and control the fourth switch S4, the fifth switch S5 and the sixth switch S6 to be open, so that the energy storage battery 20 and the secondary side of the DC-DC converter 103 form a parallel structure, and the energy storage charging pile 10 outputs the power supply voltage through the secondary side of the DC-DC converter 103; Step 5: If not, control the first switch S1 and the second switch S2 to be open, and control the fourth switch S4, the fifth switch S5 and the sixth switch S6 to be closed, so that the energy storage battery 20 and the secondary side of the DC-DC converter 103 form a series structure, and the energy storage charging pile 10 outputs the power supply voltage through the secondary side of the DC-DC converter 103 and the energy storage battery 20.
[0070] In an optional embodiment, the control module 101 in the energy storage charging pile 10 provided in this application is also connected to the charging gun. After the charging gun establishes a connection with the charging port of the external device, the control module 101 obtains the target charging demand of the external device through the charging gun, and controls the on / off of each switch according to the target charging demand and the switching limit value of each switch in the switch module 104, so that the output voltage of the energy storage charging pile 10 reaches the target charging demand. The switching limit value includes: the upper limit value and the lower limit value.
[0071] Optionally, the switching of switches is mainly used to adapt to changes in the system's operating state, in order to maintain the safe and stable operation of the power system. The upper and lower switching limits of the switches refer to key threshold parameters for the switches to perform switching actions, defining the conditions under which the switches will connect or disconnect. For example, when the monitored voltage value exceeds the upper switching limit, the switch will disconnect. Similarly, when the monitored voltage value is lower than the lower switching limit, the switch will disconnect. The upper and lower switching limits can be preset by the user or are factory settings; this application does not specifically limit this.
[0072] Optionally, the control timing of control module 101 is as follows: Figure 6 and Figure 8 This application will not elaborate further.
[0073] In one alternative implementation, see [link to implementation details]. Figure 9 The energy storage charging system 30 provided in this application includes: the energy storage charging pile 10 and the energy storage battery 20 as described in the above embodiments. The energy storage charging pile 10 is connected to the energy storage battery 20, and the connection point between the energy storage battery 20 and the energy storage charging pile 10 is the same as in the above embodiments, which will not be repeated here.
[0074] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An energy storage charging station, characterized by, The energy storage charging pile includes: a control module, an AC-DC converter, a DC-DC converter, and a switch module, wherein the switch module includes multiple switches; The input terminal of the AC-DC converter is used to connect to the AC power grid. The positive output terminal of the AC-DC converter is connected to the positive terminal of the energy storage battery and the positive input terminal of the DC-DC converter, respectively. The negative output terminal of the AC-DC converter is connected to the negative terminal of the energy storage battery and the negative input terminal of the DC-DC converter, respectively. The first terminal of the switch module is connected to the energy storage battery, the positive output terminal of the DC-DC converter is connected to the second terminal of the switch module, the negative output terminal of the DC-DC converter is connected to the third terminal of the switch module, and the switch module is connected to the charging port of an external device via a charging gun. The switching module is used to adjust the series or parallel connection between the energy storage battery and the DC-DC converter so that the output voltage of the energy storage charging pile meets the target charging requirements of the external device.
2. The energy storage charging station of claim 1, wherein, The switch module includes: a first switch and a second switch; The input terminal of the first switch is connected to the positive output terminal of the DC-DC converter, and the output terminal of the first switch is connected to the charging gun. The input terminal of the second switch is connected to the negative output terminal of the DC-DC converter, and the output terminal of the second switch is connected to the charging gun. When both the first switch and the second switch are closed, the energy storage battery and the DC-DC converter form a parallel structure, and the output voltage of the energy storage charging pile is equal to the output voltage of the DC-DC converter.
3. The energy storage charging station of claim 2, wherein, The switch module also includes: a third switch and a fourth switch; The input terminal of the third switch is connected to the positive terminal of the energy storage battery and the positive input terminal of the DC-DC converter, and the output terminal of the third switch is connected to the negative output terminal of the DC-DC converter and the input terminal of the second switch. The input terminal of the fourth switch is connected to the negative terminal of the energy storage battery and the negative input terminal of the DC-DC converter, and the output terminal of the fourth switch is connected to the charging gun.
4. The energy storage charging station of claim 3, wherein, When both the first and second switches are closed and both the third and fourth switches are open, the energy storage battery and the DC-DC converter form a parallel structure, and the output voltage of the energy storage charging pile is equal to the output voltage of the DC-DC converter.
5. The energy storage charging pile according to claim 3, characterized in that, When the second switch is open and the first switch, the third switch, and the fourth switch are all closed, the energy storage battery and the DC-DC converter form a series structure, and the output voltage of the energy storage charging pile is equal to the sum of the output voltage of the energy storage battery and the output voltage of the DC-DC converter.
6. The energy storage charging station of claim 2, wherein, The switch module also includes: a fourth switch and a sixth switch; The input terminal of the fourth switch is connected to the negative terminal of the energy storage battery and the negative input terminal of the DC-DC converter, and the output terminal of the fourth switch is connected to the charging gun. The input terminal of the sixth switch is connected to the positive terminal of the energy storage battery and the positive input terminal of the DC-DC converter, and the output terminal of the sixth switch is connected to the positive output terminal of the DC-DC converter and the input terminal of the first switch.
7. The energy storage charging station of claim 6, wherein, The switch module also includes: a fifth switch; The input terminal of the fifth switch is connected to the negative output terminal of the DC-DC converter, and the output terminal of the fifth switch is connected to the charging gun.
8. The energy storage charging pile according to claim 7, characterized in that, When the first switch and the second switch are both closed, and the fourth switch, the fifth switch and the sixth switch are all open, the energy storage battery and the DC-DC converter form a parallel structure, and the output voltage of the energy storage charging pile is equal to the output voltage of the DC-DC converter.
9. The energy storage charging station of claim 7, wherein, When the first switch and the second switch are both open, and the fourth switch, the fifth switch and the sixth switch are all closed, the energy storage battery and the DC-DC converter form a series structure, and the output voltage of the energy storage charging pile is equal to the difference between the output voltage of the energy storage battery and the output voltage of the DC-DC converter.
10. An energy storage charging system, characterized by, The energy storage charging system includes the energy storage charging pile and energy storage battery as described in any one of claims 1-9.