Energy storage charging pile

Abstract

The invention provides an energy storage charging pile, and belongs to the technical field of energy storage charging. The energy storage charging pile comprises a control module, an alternating current-direct current converter, an energy storage battery, a direct current-direct current converter and a switch module comprising a plurality of switches. Wherein the first end of the switch module is connected with the energy storage battery, the positive electrode output end of the direct current-direct current converter is connected with the second end of the switch module, the negative electrode output end of the direct current-direct current converter is connected with the third end of the switch module, and the switch module is connected with external equipment through the charging gun; the control end of each switch in the switch module is connected with the control module, and the control module is used for adjusting the series connection structure or the parallel connection structure between the energy storage battery and the DC-DC converter by controlling the on-off of each switch in the switch module, so that the output voltage of the energy storage charging pile meets the charging requirement of external equipment. The conversion efficiency of the energy storage charging pile can be improved, and the effect of meeting the high-power charging requirement of an over-charging vehicle type can be achieved.

Description

Technical Field

[0001] The present application relates to the field of energy storage and charging technology, and in particular to an energy storage and charging pile. Background Art

[0002] In recent years, with the influx of supercharging vehicles into the market, demand for high-power charging of electric vehicles has increased significantly. However, the current power distribution network capacity of energy storage charging piles is limited. The power provided by the distribution network is insufficient to support the high-power charging needs of supercharging vehicles, resulting in limited installed charging power for electric vehicles. Therefore, there is an urgent need to expand the energy storage charging power of energy storage charging piles to meet the high-power charging needs of supercharging vehicles.

[0003] In related technologies, the charging power of energy storage charging piles is typically expanded by cascading an AC-DC converter and a DC-DC converter. This approach primarily involves adding an energy storage battery between the two converters to expand the capacity of the DC-DC converter, thereby achieving high-power charging for the energy storage charging pile.

[0004] However, when charging electric vehicles based on related technologies, there is a problem of low power conversion efficiency. Summary of the Invention

[0005] The purpose of this application is to provide an energy storage charging pile that can improve the conversion efficiency of the energy storage charging pile to meet the high-power charging needs of supercharging vehicles.

[0006] The embodiment of the present application is implemented as follows: In a first aspect of an embodiment of the present application, there is provided an energy storage charging pile, comprising: a control module, an AC-DC converter, a DC-DC converter, and a switch module, wherein the switch module comprises a plurality of switches; The input end of the AC-DC converter is used to connect to the AC power grid, the positive output end of the AC-DC converter is connected to the positive electrode of the energy storage battery and the positive input end of the DC-DC converter respectively, and the negative output end of the AC-DC converter is connected to the negative electrode of the energy storage battery and the negative input end of the DC-DC converter respectively; The first end of the switch module is connected to the energy storage battery, the positive output end of the DC-DC converter is connected to the second end of the switch module, the negative output end of the DC-DC converter is connected to the third end of the switch module, and the switch module is connected to the charging port of the external device via the charging gun; The control ends of each switch in the switch module are connected to the control module. The control module is used to adjust the series structure or parallel structure between the energy storage battery and the DC-DC converter by controlling the on and off of each switch in the switch module, so that the output voltage of the energy storage charging pile meets the target charging requirements of the external device.

[0007] As a possible implementation, the switch module includes: a first switch, a second switch, a third switch, and a fourth switch; The input end of the first switch is connected to the positive output end of the DC-DC converter, and the output end of the first switch is connected to the charging gun; The input end of the second switch is connected to the negative output end of the DC-DC converter and the output end of the third switch respectively, and the output end of the second switch and the output end of the fourth switch are both connected to the charging gun; The input end of the third switch is connected to the positive electrode of the energy storage battery, and the positive electrode of the fourth switch is connected to the negative electrode of the energy storage battery.

[0008] As a possible implementation method, when the first switch and the second switch are both closed and the third switch and the fourth switch are both 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.

[0009] As a possible implementation method, when the second switches are all disconnected 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.

[0010] As a possible implementation, the switch module includes: a first switch, a second switch, a fourth switch, a fifth switch, and a sixth switch; The input end of the first switch is connected to the positive output end of the DC-DC converter and the output end of the sixth switch, and the output end of the first switch and the output end of the fifth switch are both connected to the charging gun; The input end of the second switch and the input end of the fifth switch are both connected to the negative output end of the DC-DC converter, and the output end of the second switch and the output end of the fourth switch are both connected to the charging gun; The input end of the sixth switch is connected to the positive electrode of the energy storage battery, and the positive electrode of the fourth switch is connected to the negative electrode of the energy storage battery.

[0011] As a possible implementation method, when the first switch and the second switch are both closed and the fourth switch, the fifth switch and the sixth switch are all disconnected, 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.

[0012] As a possible implementation method, when the first switch and the second switch are both disconnected 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.

[0013] As a possible implementation method, the control module is also connected to the charging gun. When the charging gun establishes a connection with the charging port of the external device, the control module obtains the target charging demand of the external device through the charging gun, and controls the on and off of each switch according to the target charging demand and the switching limit of each switch in the switch module, so that the output voltage of the energy storage charging pile reaches the target charging demand, wherein the switching limit includes: an upper switching limit value and a lower switching limit value.

[0014] In one possible implementation, if the control module determines that the target charging demand is greater than the switching upper limit of the third switch and the fourth switch, the first switch, the third switch, and the fourth switch are all controlled to be closed, and the second switch is controlled to be disconnected; otherwise, the first switch and the second switch are all controlled to be closed, and the third switch and the fourth switch are all controlled to be disconnected.

[0015] In one possible implementation, if the control module determines that the target charging demand is greater than the upper switching limit of the fourth switch, the fifth switch, and the sixth switch, or the target charging demand is less than the lower switching limit of the fourth switch, the fifth switch, and the sixth switch, the first switch and the second switch are controlled to be closed, and the fourth switch, the fifth switch, and the sixth switch are controlled to be disconnected; otherwise, the fourth switch, the fifth switch, and the sixth switch are controlled to be closed, and the first switch and the second switch are controlled to be disconnected.

[0016] The beneficial effects of the embodiments of the present application include: An energy storage charging pile provided in an embodiment of the present application comprises an energy storage charging pile composed of a control module, an AC-DC converter, a DC-DC converter, and a switch module, wherein the switch module includes multiple switches. The input end of the AC-DC converter is connected to the AC power provided by the AC grid, and the output end of the AC-DC converter and the positive and negative poles of the energy storage battery are both connected to the primary side of the DC-DC converter. The first end of the switch module is connected to the energy storage battery, the second end of the switch module is connected to the positive output end of the DC-DC converter, and the third end of the switch module is connected to the negative output end of the DC-DC converter. The switch module is connected to an external device via a charging gun. The control module is connected to the charging gun and the control end of each switch in the switch module. The control module obtains the target charging demand of the external device connected to the charging gun in real time and controls the on and off of each switch in the switch module according to the target charging demand to change the access point of the energy storage battery to the main power circuit of the energy storage charging pile, thereby improving the power conversion efficiency of the energy storage charging pile. 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the circuit topology of an existing energy storage charging pile; Figure 2 A schematic structural diagram of the first energy storage charging pile provided in an embodiment of the present application; Figure 3 A schematic diagram of a cascade structure of an existing DC-DC converter; Figure 4 A connection diagram of a DC-DC converter provided in an embodiment of the present application; Figure 5 A schematic diagram of the structure of the second energy storage charging pile provided in an embodiment of the present application; Figure 6 A control timing diagram of a control module provided in an embodiment of the present application; Figure 7 A schematic structural diagram of the third energy storage charging pile provided in an embodiment of the present application; Figure 8 A control timing diagram of another control module provided in an embodiment of the present application.

[0019] Figure 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. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0023] In the description of this application, it should be noted that the terms "first", "second", "third", "fourth", "fifth", "sixth", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. It should also be noted that, unless otherwise clearly stipulated and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] Currently, energy storage charging piles are being expanded to meet the high-power charging demands of supercharged vehicles by adding energy storage batteries between the AC-DC converter and the DC-DC converter to increase the DC-DC converter's capacity. However, this solution generates charging voltage through a two-stage operation mode, using both the AC-DC converter and the DC-DC converter, resulting in low energy conversion efficiency. This results in low power conversion efficiency for energy storage charging piles.

[0025] To this end, an embodiment of the present application provides an energy storage charging pile. By adding a toggle switch to the switch module, the control module controls the on and off of each switch after collecting the target charging demand of the electric vehicle to be charged, so as to flexibly adjust the cascade structure between the DC-DC converter and the energy storage battery, thereby changing the access point of the energy storage battery to 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 requirements of supercharged vehicles. In this way, the conversion efficiency of the energy storage charging pile can be improved to meet the high-power charging requirements of supercharged vehicles.

[0026] Figure 1 This is a schematic diagram of the circuit topology of an existing energy storage charging pile, see Figure 1 This approach often involves connecting an AC-DC converter to the AC power provided by the distribution network. The AC-DC converter then converts the received AC power into the corresponding DC power. By adding an energy storage battery between the AC-DC converter and the DC-DC converter, the DC power applied to the DC-DC converter's input is increased, allowing the DC-DC converter to provide greater power. However, this solution primarily relies on the cascade structure formed by the AC-DC converter and the DC-DC converter to achieve power conversion in the energy storage charging pile, which significantly reduces the power conversion efficiency of the energy storage charging pile.

[0027] The energy storage charging pile provided in the embodiment of the present application is explained in detail below with reference to the accompanying drawings.

[0028] It is worth mentioning that Figures 2 to 8 In the figure, 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, 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 The structural diagram of an energy storage charging pile provided in this application is shown in Figure 2 An energy storage charging pile 10 provided in an embodiment of the present application includes: a control module 101, an AC-DC converter 102, an energy storage battery 20, a DC-DC converter 103 and a switch module 104, wherein the switch module 104 includes multiple switches.

[0030] Optionally, the control module 101 can be specifically implemented by a controller. The control module 101 serves as the core component of the energy storage charging pile 10. The control module 101 is connected to the control end of each switch in the switch module 104. At the same time, the control module 101 is also connected to the charging gun. The control module 101 obtains the charging demand of the electric vehicle to be charged connected to the charging gun through the charging gun, and adjusts the on-off state of each switch according to the charging demand, 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 not only considers conversion efficiency but also considers the cost-effectiveness of power supply. For example, when the time-of-use electricity price is high, the control module 101 controls the operating power of the AC-DC converter 102 to decrease. At this time, the energy storage battery 20 is discharged first. When the power 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 to maximize economic benefits. For another example, when the time-of-use electricity price is low, the control module 101 preferentially drives 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 begins 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 a battery external to the energy storage charging pile 10 , and this application does not make any specific restrictions on this.

[0033] The input end of the AC-DC converter 102 is used to access the AC power grid, the positive output end of the AC-DC converter 102 is connected to the positive electrode of the energy storage battery 20 and the positive input end of the DC-DC converter 103, and the negative output end of the AC-DC converter 102 is connected to the negative electrode of the energy storage battery 20 and the negative input end of the DC-DC converter 103.

[0034] Optionally, the AC-DC converter 102 is configured to receive AC power from an AC grid and convert the AC power from the AC grid into DC power for transmission to the energy storage battery 20 and the DC-DC converter 103. Furthermore, the energy storage battery 20 can also provide stable and reliable DC power to the DC-DC converter 103, thereby expanding the power capacity of the DC-DC converter 103.

[0035] The first end of the switch module 104 is connected to the energy storage battery 20, the positive output end of the DC-DC converter 103 is connected to the second end of the switch module 104, the negative output end of the DC-DC converter 103 is connected to the third end of the switch module 104, and the switch module 104 is connected to the charging port of the external device via a charging gun.

[0036] Optionally, the first end of the switch module 104 is connected to the energy storage battery 20, and the access point of the energy storage battery 20 at the AC-DC converter 102 and the DC-DC converter 103 can be changed through the first end of the switch module 104 to change the connection relationship between the energy storage battery 20 and the DC-DC converter 103.

[0037] Optionally, the positive output end of the DC-DC converter 103 is connected to the second end of the switch module 104, and the negative output end of the DC-DC converter 103 is connected to the third end of the switch module 104. The voltage output by the DC-DC converter 103 is transmitted to the charging gun via the switch module 104 to power the electric vehicle.

[0038] Among them, the external device can be various types of electric vehicles. 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 starts to detect the charging needs of the electric vehicle and provides the corresponding charging voltage for the electric vehicle.

[0039] It is worth noting that the first end, the second end and the third end of the switch module 104 are all input ends of the switch module. The first end is used to connect to the voltage provided by the energy storage battery 20, the second end is used to connect to the positive output voltage of the DC-DC converter 103, and the third end 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 via the charging gun to complete charging.

[0040] The control ends of the switches in the switch module 104 are connected to the control module 101. The control module 101 is used to adjust the series structure or parallel structure between the energy storage battery 20 and the DC-DC converter 103 by controlling the on and off of the switches in the switch module 104, 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 charging amount 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 and off 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] The series structure refers to the energy storage battery 20 being connected in series with the secondary side of the DC-DC converter 103, and 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 a preset voltage range, the control module 101 controls the on and off of each switch in the switch module 104 so that the energy storage battery 20 and the secondary side of the DC-DC converter 103 form a series structure. Conversely, when the target charging demand of the electric vehicle is lower than the preset voltage range, the control module 101 controls the on and off of each switch in the switch module 104 so that the energy storage battery 20 and the primary side of the DC-DC converter 103 form a parallel structure, so that the energy storage charging pile 10 can be directly powered by the output of 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 the supply voltage value of the energy storage battery, and 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, when the charging voltage required by electric vehicle A is above 300V, the control module 101 controls the switches in the switch module 104 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 charges electric vehicle A via the energy storage battery 20 and the DC-DC converter 103; when the charging voltage required by electric vehicle A is below 300V, the control module 101 controls the switches in the switch module 104 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 directly outputs the supply voltage via the secondary side of the DC-DC converter 103.

[0044] In an embodiment of the present application, an energy storage charging pile is composed of a control module, an AC-DC converter, a DC-DC converter, and a switch module, wherein the switch module includes multiple switches. The input end of the AC-DC converter is connected to the AC power provided by the AC grid, and the output end of the AC-DC converter and the positive and negative poles of the energy storage battery are both connected to the primary side of the DC-DC converter; the first end of the switch module is connected to the energy storage battery, the second end of the switch module is connected to the positive output end of the DC-DC converter, and the third end of the switch module is connected to the negative output end of the DC-DC converter. The switch module is connected to an external device via a charging gun; the control module is connected to the charging gun and the control end of each switch in the switch module. The control module obtains the target charging demand of the external device connected to the charging gun in real time and controls the on and off of each switch in the switch module according to the target charging demand to change the access point of the energy storage battery to the main power circuit in the energy storage charging pile, thereby improving the power conversion efficiency of the energy storage charging pile. 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.

[0045] Figure 3 This is a schematic diagram of a cascade structure of an existing DC-DC converter, see Figure 3 In existing energy storage charging piles, the primary side of the DC-DC converter (usually composed of DC-AC conversion, AC-AC isolation transformer, and AC-DC conversion) forms a parallel structure with the previous 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 side input voltage of the DC-DC converter. The energy storage charging pile can only provide charging power to the external electric vehicle through the secondary side of the DC-DC converter.

[0046] Figure 4 This is a connection diagram of a DC-DC converter provided in this application, see Figure 4 In the energy storage charging pile 10 provided in the embodiment of the present application, not only can the secondary side of the DC-DC converter 103 be used to supply power to the external electric vehicle, for example, the output terminal out of the DC-DC converter 103 is directly connected to the charging port EV of the external electric vehicle; the DC-DC converter 103 can also be combined with the energy storage battery 20 to jointly supply power to the external electric vehicle, and when the energy storage battery 20 supplies power to the electric vehicle, it does not need to be converted into electric energy through the DC-DC converter 103, 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, which is connected to the charging port EV of the external electric vehicle.

[0047] In an optional embodiment, see Figure 5 The switch module 104 in the energy storage charging pile 10 provided in the embodiment of the present application includes: a first switch 1041 , a second switch 1042 , a third switch 1043 and a fourth switch 1044 .

[0048] The input end of the first switch 1041 is connected to the positive output end of the DC-DC converter 103, and the output end of the first switch 1041 is connected to the charging gun; The input end of the second switch 1042 is connected to the negative output end of the DC-DC converter 103 and the output end of the third switch 1043 respectively. The output end of the second switch 1042 and the output end of the fourth switch 1044 are both connected to the charging gun. An input end of the third switch 1043 is connected to the positive electrode of the energy storage battery 20 , and a positive electrode of the fourth switch 1044 is connected to the negative electrode of the energy storage battery 20 .

[0049] Optionally, the positive voltage point of the energy storage battery 20 is changed to the negative output terminal of the secondary side of the DC-DC converter 103 through the third switch 1043, and the negative voltage point of the energy storage battery 20 is changed to the negative output terminal of the secondary side of the DC-DC converter 103 through the fourth switch 1044.

[0050] In an optional embodiment, see 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 disconnected, the access 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 forms a parallel structure with the primary side of the DC-DC converter 103. The energy storage charging pile 10 only supplies power to the external electric vehicle via the secondary side 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 side output voltage of the DC-DC converter 103.

[0052] When the second switch 1042 is disconnected 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 disconnected, 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 U_EV of the energy storage charging pile 10 is 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 disconnected and the third switch 1043 and the fourth switch 1044 are both turned on, 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 turned on, 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 = U_BAT + U_DCDC, 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 switching upper limit U_uplmt of the third switch 1043 and the fourth switch 1044, the first switch 1041, the third switch 1043 and the fourth switch 1044 are controlled to be closed, and the second switch 1042 is controlled to be opened; otherwise, the first switch 1041 and the second switch 1042 are controlled to be closed, and the third switch 1043 and the fourth switch 1044 are controlled to be opened.

[0056] Figure 6 For a control timing diagram of a control module provided in this application, see 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 required 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, determines whether the target required voltage of the electric vehicle exceeds the switching limit of the third switch S3 and the fourth switch S4; Step 3, if so, controls the first switch S1, the third switch S3 and the fourth switch S4 to be closed, and controls the second switch S2 to be disconnected, so that the energy storage battery 20 and the secondary side of the DC-DC converter 103 form a series structure; Step 4, if not, controls the first switch S1 and the second switch S2 to be closed, and controls the third switch S3 and the fourth switch S4 to be disconnected, 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 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 make any specific limitation on this.

[0058] In an optional embodiment, see Figure 7 The switch module 104 in the energy storage charging pile 10 provided in the embodiment of the present application 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 end of the first switch 1041 is connected to the positive output end of the DC-DC converter 103 and the output end of the sixth switch 1046 . The output end of the first switch 1041 and the output end of the fifth switch 1045 are both connected to the charging gun. The input end of the second switch 1042 and the input end of the fifth switch 1045 are both connected to the negative output end of the DC-DC converter 103, and the output end of the second switch 1042 and the output end of the fourth switch 1044 are both connected to the charging gun; An input end of the sixth switch 1046 is connected to the positive electrode of the energy storage battery 20 , and a positive electrode of the fourth switch 1044 is connected to the negative electrode of the energy storage battery 20 .

[0060] Optionally, the input end of the sixth switch 1046 is connected to the positive electrode of the energy storage battery 20, and the output end of the sixth switch 1046 is connected to the positive output end of the DC-DC converter 103 and the input end 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 end of the secondary side of the DC-DC converter 103.

[0061] Optionally, the input end of the fifth switch 1045 is connected to the negative output end of the secondary side of the DC-DC converter 103, and the output end of the fifth switch 1045 and the output end of the first switch 1041 are both connected to the positive power supply port of the charging gun.

[0062] Optionally, the input end of the fourth switch 1044 is connected to the negative pole of the energy storage battery 20, and the output end of the fourth switch 1044 and the output end of 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 pole voltage point of the energy storage battery 20 to the negative power supply port of the charging gun.

[0063] In an optional embodiment, see 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 opened, 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 all closed and the fourth switch 1044, the fifth switch 1045 and the sixth switch 1046 are all disconnected, the access 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 forms a parallel structure with the primary side of the DC-DC converter 103, and the energy storage charging pile 10 only supplies power to the external electric vehicle via the secondary side 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 side output voltage of the DC-DC converter 103.

[0065] When the first switch 1041 and the second switch 1042 are both disconnected, 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 disconnected, and the fourth switch 1044, the fifth switch 1045, and the sixth switch 1046 are all closed, the energy storage battery 20 and the secondary side of the DC-DC converter 103 are connected in series, and the output voltage U_EV of the energy storage charging pile 10 is U_BAT-U_DCDC.

[0067] It is worth noting that when the fourth switch 1044 is closed, the negative electrode 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; when the sixth switch 1046 is closed, the positive electrode voltage of the energy storage battery 20 is transferred to the positive output terminal of the DC-DC converter 103.

[0068] In an optional embodiment, if the control module 101 determines that the target charging demand U_EV is greater than the upper switching limit U_uplmt 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 switching limit U_downlmt 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 controlled to be closed, and the fourth switch 1044, the fifth switch 1045, and the sixth switch 1046 are controlled to be disconnected; otherwise, the fourth switch 1044, the fifth switch 1045, and the sixth switch 1046 are controlled to be closed, and the first switch 1041 and the second switch 1042 are controlled to be disconnected.

[0069] Figure 8 For another control timing diagram of the control module provided in this application, see Figure 8 , Figure 8The control logic of the energy storage charging pile 10 is as follows: Step 1, the control module 101 obtains the target required voltage U_EV of the external device through the charging gun, and obtains the switching upper limit U_uplmt and the switching lower limit U_downlmt of the fourth switch S4, the fifth switch S5 and the sixth switch S6; Step 2, it is determined whether the target required voltage of the electric vehicle exceeds the switching upper limit U_uplmt of the fourth switch S4, the fifth switch S5 and the sixth switch S6, or whether the target required voltage of the electric vehicle is lower than the switching lower limit U_downlmt of the fourth switch S4, the fifth switch S5 and the sixth switch S6; Step 3, if so, control the The first switch S1 and the second switch S2 are closed, and the fourth switch S4, the fifth switch S5, and the sixth switch S6 are controlled 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 supply voltage through the secondary side of the DC-DC converter 103. Step 4: If not, the first switch S1 and the second switch S2 are controlled to be open, and the fourth switch S4, the fifth switch S5, and the sixth switch S6 are controlled 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 supply voltage through the secondary side of the DC-DC converter 103 and the energy storage charging pile 10.

[0070] In an optional embodiment, the control module 101 in the energy storage charging pile 10 provided in the embodiment of the present 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 and off of each switch according to the target charging demand and the switching limit 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, wherein the switching limit includes: an upper switching limit value and a lower switching limit value.

[0071] Optionally, the switching of the switch is mainly used to adapt to changes in the operating state of the system to maintain safe and stable operation of the power system. Among them, the upper and lower switching limits of the switch refer to the key threshold parameters for the switch to be connected or disconnected, which are used to define the conditions under which the switch is connected or disconnected. For example, when the monitored voltage value exceeds the upper switching limit, the switch performs a disconnection action. For another example, when the monitored voltage value is lower than the lower switching limit, the switch performs a disconnection action, etc. The upper and lower switching limits of the switch can be pre-set by the user, or can be the factory settings of the switch, and this application does not make specific restrictions on this.

[0072] Optionally, the control timing of the control module 101 can be found in Figure 6 and Figure 8 , this application will not go into details here.

[0073] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0074] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An energy storage charging pile, characterized in that: 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 a plurality of switches; The input end of the AC-DC converter is used to access the AC power grid, the positive output end of the AC-DC converter is connected to the positive electrode of the energy storage battery and the positive input end of the DC-DC converter respectively, and the negative output end of the AC-DC converter is connected to the negative electrode of the energy storage battery and the negative input end of the DC-DC converter respectively; The first end of the switch module is connected to the energy storage battery, the positive output end of the DC-DC converter is connected to the second end of the switch module, the negative output end of the DC-DC converter is connected to the third end of the switch module, and the switch module is connected to the charging port of an external device via a charging gun; The control end of each switch in the switch module is connected to the control module, and the control module is used to adjust the series structure or parallel structure between the energy storage battery and the DC-DC converter by controlling the on and off of each switch in the switch module, so that the output voltage of the energy storage charging pile meets the target charging requirement of the external device.

2. The energy storage charging pile according to claim 1, characterized in that: The switch module includes: a first switch, a second switch, a third switch and a fourth switch; The input end of the first switch is connected to the positive output end of the DC-DC converter, and the output end of the first switch is connected to the charging gun; The input end of the second switch is connected to the negative output end of the DC-DC converter and the output end of the third switch respectively, and the output end of the second switch and the output end of the fourth switch are both connected to the charging gun; The input end of the third switch is connected to the positive electrode of the energy storage battery, and the positive electrode of the fourth switch is connected to the negative electrode of the energy storage battery.

3. The energy storage charging pile according to claim 2, characterized in that: When the first switch and the second switch are both closed and the third switch and the fourth switch are both 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.

4. The energy storage charging pile according to claim 2, characterized in that: When the second switch is disconnected 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.

5. The energy storage charging pile according to claim 1, characterized in that: The switch module includes: a first switch, a second switch, a fourth switch, a fifth switch and a sixth switch; The input end of the first switch is connected to the positive output end of the DC-DC converter and the output end of the sixth switch, and the output end of the first switch and the output end of the fifth switch are both connected to the charging gun; The input end of the second switch and the input end of the fifth switch are both connected to the negative output end of the DC-DC converter, and the output end of the second switch and the output end of the fourth switch are both connected to the charging gun; The input end of the sixth switch is connected to the positive electrode of the energy storage battery, and the positive electrode of the fourth switch is connected to the negative electrode of the energy storage battery.

6. The energy storage charging pile according to claim 5, 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 opened, 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.

7. The energy storage charging pile according to claim 6, characterized in that: When the first switch and the second switch are both disconnected, 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.

8. The energy storage charging pile according to claim 1, characterized in that: The control module is also connected to the charging gun. When the charging gun establishes a connection with the charging port of the external device, the control module obtains the target charging demand of the external device through the charging gun, and controls the on and off of each switch in the switch module according to the target charging demand and the switching limit of each switch, so that the output voltage of the energy storage charging pile reaches the target charging demand, wherein the switching limit includes: an upper switching limit value and a lower switching limit value.

9. The energy storage charging pile according to claim 8, characterized in that: If the control module determines that the target charging demand is greater than the switching upper limit of the third switch and the fourth switch, the first switch, the third switch, and the fourth switch are all controlled to be closed, and the second switch is controlled to be opened; otherwise, the first switch and the second switch are all controlled to be closed, and the third switch and the fourth switch are all controlled to be opened.

10. The energy storage charging pile according to claim 8, characterized in that: If the control module determines that the target charging demand is greater than the upper switching limits of the fourth switch, the fifth switch, and the sixth switch, or the target charging demand is less than the lower switching limits of the fourth switch, the fifth switch, and the sixth switch, the first switch and the second switch are controlled to be closed, and the fourth switch, the fifth switch, and the sixth switch are controlled to be opened; otherwise, the fourth switch, the fifth switch, and the sixth switch are controlled to be closed, and the first switch and the second switch are controlled to be opened.

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