An energy storage device for a bidirectional charging pile

Abstract

This utility model belongs to the field of charging pile technology and discloses an energy storage device for a bidirectional charging pile, including a battery and a control unit. The battery is connected to a high-voltage box, the high-voltage box is connected to a photovoltaic unit and a DC charging interface, and the DC charging interface is connected to the bidirectional charging pile. The photovoltaic unit generates electrical energy and transmits it to the high-voltage box. The high-voltage box is equipped with a switch for controlling the current flow. The control unit connects the battery, the high-voltage box, the photovoltaic unit, and the DC charging interface. The beneficial effects of this utility model are: it can provide users with multiple convenient, efficient, and safe energy storage battery charging and discharging modes, improving the utilization rate of bidirectional charging piles.

Description

Technical Field

[0001] This utility model relates to the field of charging pile technology, and in particular to an energy storage device for a bidirectional charging pile. Background Technology

[0002] The rapid development of new energy vehicles has driven the development of distributed energy storage, laying a solid foundation for the rapid development of bidirectional charging piles. However, due to the high mobility of current new energy vehicles, there are many uncertainties in charging and discharging times, which can easily lead to peak grid loads and may also affect other electrical equipment. Some new energy vehicle owners lack confidence in the battery life of current new energy vehicles and cannot fully accept high-power discharge modes, thus resulting in a lack of vitality in the current bidirectional charging pile market.

[0003] Currently, there are two common energy storage methods in the field of bidirectional charging piles. One is to install bidirectional charging piles, where the charging pile outputs DC power to the new energy vehicle when it needs to be charged, and draws power from the vehicle's battery when it needs to be discharged, then inputs it into the grid after isolation conversion and inversion. The other is to install industrial and commercial energy storage cabinets, which store electrical energy in energy storage batteries during off-peak electricity price periods, and then output the stored electrical energy to the grid after inversion during peak electricity price periods.

[0004] The existing methods described above have the following drawbacks: 1. New energy vehicles are highly mobile, with irregular charging and discharging times, further widening the peak-valley difference in grid load, potentially leading to problems such as distribution network line overload and transformer overload; 2. Common energy storage devices lack DC charging interfaces and are incompatible with the GB / T 27930.2-2024 communication protocol, making energy interaction with bidirectional charging piles impossible; 3. Energy storage batteries lack direct charging and discharging capabilities, requiring additional energy storage converters, increasing user investment costs; 4. The energy flow modes of current energy storage devices are imperfect, preventing energy interaction with bidirectional charging piles, loads, new energy vehicles, and photovoltaic power generation; 5. Bidirectional charging piles on the market lack fixed energy storage devices, limiting the benefits users can enjoy from grid-connected power generation and preventing them from maximizing electricity price discounts; 6. Some industrial and commercial parks have insufficient transformer capacity, with insufficient capacity during peak electricity consumption and excess capacity during off-peak periods. Upgrading transformers and their distribution network lines is costly, preventing users from enjoying higher-power electrical equipment.

[0005] Therefore, it is necessary to provide an energy storage device for bidirectional charging piles to improve the energy storage system of bidirectional charging piles and provide users with a variety of convenient, efficient and safe energy storage battery charging and discharging modes. Utility Model Content

[0006] This utility model discloses an energy storage device for a bidirectional charging pile, which can effectively solve the technical problems involved in the background art.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] An energy storage device for a bidirectional charging pile includes a battery and a control unit. The battery is connected to a high-voltage box, the high-voltage box is connected to a photovoltaic unit and a DC charging interface, the DC charging interface is connected to the bidirectional charging pile, the photovoltaic unit is used to generate electrical energy and transmit it to the high-voltage box, the high-voltage box is equipped with a switch for controlling the current flow, and the control unit is connected to the battery, the high-voltage box, the photovoltaic unit and the DC charging interface.

[0009] As a preferred improvement of this utility model, the battery comprises multiple battery packs connected in series.

[0010] As a preferred improvement of this utility model: the switch includes a power dispatching switch KM1, a power dispatching switch KM2, a power dispatching switch KM3, a power dispatching switch KM4, and a power dispatching switch KM5. One end of the power dispatching switch KM1 is connected to one end of the power dispatching switch KM5 and one end of the fuse FU1. The other end of the fuse FU1 is connected to the positive terminal of the battery. The other end of the power dispatching switch KM5 is connected to one end of the resistor R1. The other end of the resistor R1 is connected to the other end of the power dispatching switch KM1, one end of the power dispatching switch KM3, and pin 1 of the circuit breaker QF. One end of the power dispatching switch KM2 is connected to one end of the shunt FL. The other end of the shunt FL is connected to one end of the fuse FU2. The other end of FU2 is connected to the negative terminal of the battery. The other end of the power dispatch switch KM2 is connected to one end of the power dispatch switch KM4 and pin 3 of the circuit breaker QF. The other ends of the power dispatch switches KM3 and KM4 are connected to the photovoltaic unit. Pin 2 of the circuit breaker QF is connected to the positive terminal of the DC charging interface. Pin 4 of the circuit breaker QF is connected to the negative terminal of the DC charging interface. The control unit is connected to the power dispatch switches KM1, KM2, KM3, KM4, KM5 and the IMD insulation monitoring device. The IMD insulation monitoring device is connected to pin 1 and pin 2 of the circuit breaker QF, respectively.

[0011] As a preferred improvement of this utility model: the energy storage device further includes a human-machine interaction unit and a housing, the human-machine interaction unit includes a display screen and buttons, the display screen and the buttons are installed on the housing of the energy storage device and connected to the control unit.

[0012] As a preferred improvement of this utility model: the energy storage device further includes a thermal management system and a cabinet. The thermal management system includes a cabinet air conditioner and a battery heating film. The battery heating film is attached to the surface of the battery. The cabinet air conditioner is installed inside the cabinet of the energy storage device to ensure that the cell temperature is within the rated operating temperature range when the battery is charging and discharging.

[0013] As a preferred improvement of this utility model: the energy storage device further includes a safety management system, which includes a combustible gas detection device, a smoke detection device, a water immersion detection device, a humidity detection device, and a fire safety system, wherein the fire safety system includes a gas extinguishing device and a sprinkler system.

[0014] As a preferred improvement of this utility model: the photovoltaic unit includes an MPPT controller, a solar power generation panel, and a DC / DC converter. The output of the solar power generation panel is connected to the DC / DC converter, and the DC / DC converter is controlled by the MPPT controller. The DC / DC converter includes a capacitor C1, with both ends of the capacitor C1 connected to the solar power generation panel. One end of the capacitor C1 is connected to the drain of a MOSFET Q1, and the source of the MOSFET Q1 is connected to one end of a capacitor C2 and the drain of the MOSFET Q2. The other end is connected to one end of inductor L1, the other end of inductor L1 is connected to one end of inductor Lm and pin 4 of transformer T1, pin 3 of transformer T1 is connected to the other end of inductor Lm, the source of MOSFET Q2 and the other end of capacitor C1, pin 1 of transformer T1 is connected to the positive terminal of diode VD1, the negative terminal of diode VD1 is connected to one end of capacitor C3 and one end of resistor Ro, pin 2 of transformer T1 is connected to the other end of capacitor C3 and the other end of resistor Ro, and the two ends of resistor Ro are connected to the high voltage box.

[0015] As a preferred improvement of this utility model: the DC charging interface is a vehicle socket conforming to the GB / T 20234.3-2023 standard, with one end connected to the high-voltage box and the other end connected to the vehicle plug of the bidirectional charging pile.

[0016] As a preferred improvement of this utility model: the control unit is connected to the cloud platform, uploads the current status of the energy storage device to the cloud platform, executes the control commands issued by the cloud platform, and supports OTA cloud platform remote upgrades.

[0017] As a preferred improvement of this utility model, the control unit includes a BCU controller.

[0018] The beneficial effects of this utility model are as follows:

[0019] Improving the energy storage system of bidirectional charging piles can provide users with a variety of convenient, efficient, and safe energy storage battery charging and discharging modes, thereby increasing the utilization rate of bidirectional charging piles. By participating in the electricity market through bidirectional charging piles, orderly charging and discharging can be achieved, such as low-storage-high-generation profit generation and voltage regulation services, realizing economic benefits. At the same time, multiple devices can be used in parallel, and users can install them as needed. They can access virtual power plants through cloud platforms, upload the current chargeable and dischargeable power in real time, and receive power dispatch control from virtual power plants to further alleviate the peak load pressure on the local power grid, fill the load trough, reduce the peak-valley difference of the power grid, and make the power generation and consumption of the power grid tend to be balanced and stable. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 This is a schematic diagram of an energy storage device for a bidirectional charging pile according to the present invention;

[0022] Figure 2 This is a schematic diagram of the high-voltage box structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the charging mode of this utility model;

[0024] Figure 4 This is a schematic diagram of the photovoltaic unit structure of this utility model;

[0025] Figure 5 This is a schematic diagram of the energy storage device of this utility model used in parallel.

[0026] In the diagram: 1-Battery, 2-High voltage box, 3-Control unit, 4-Human-machine interaction unit, 5-Thermal management system, 6-Safety management system, 7-Photovoltaic unit, 8-DC charging interface. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0029] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0032] Please see Figure 1 As shown, this utility model provides an energy storage device for a bidirectional charging pile, including multiple energy storage battery packs, a high-voltage box, a control unit, a photovoltaic unit, a human-machine interface unit, a safety management system, a thermal management system, and a DC charging interface. The energy storage batteries are connected to the high-voltage box, which is connected to the energy storage batteries, the photovoltaic units, and the DC charging interface to change the operating mode of the energy storage batteries and the photovoltaic units. The photovoltaic units are connected to the high-voltage box, and the DC charging interface is connected to the bidirectional charging pile. The control unit is connected to the energy storage batteries, the high-voltage box, the human-machine interface unit, the thermal management system, the safety management system, the photovoltaic units, and the DC charging interface. This improved energy storage system for the bidirectional charging pile provides users with various convenient, efficient, and safe energy storage battery charging and discharging modes, increasing the utilization rate of the bidirectional charging pile.

[0033] Specifically, it includes multiple energy storage battery packs, a high-voltage box 2, a control unit 3, a human-machine interface unit 4, a safety management system 6, photovoltaic units 7, and a DC charging interface 8. The energy storage batteries are connected to the high-voltage box 2, which in turn is connected to the energy storage batteries, photovoltaic units 7, and DC charging interface 8. The high-voltage box 2 is used to change the operating mode of the energy storage batteries and photovoltaic units 7. Each photovoltaic unit 7 is connected to the high-voltage box 2. The DC charging interface 8 is connected to a bidirectional charging pile. The control unit 3 is connected to the energy storage batteries, high-voltage box 2, human-machine interface unit 4, thermal management system 5, safety management system 6, photovoltaic units 7, and DC charging interface 8. The multiple battery packs are connected in series. The high-voltage box 2 includes a pre-charging circuit, a shunt, a fuse, a circuit breaker, an IMD insulation monitoring device, and multiple power dispatch switches. These power dispatch switches form multiple high-voltage power control circuits, which are connected to the energy storage battery and the photovoltaic unit 7, respectively, and to the DC charging interface 8 via the circuit breaker. The power dispatch switches are controlled by the control unit 3. The high-voltage power control circuit connecting the high-voltage box to the energy storage battery is equipped with a fuse and a shunt, and is connected to the control unit 3, enabling the high-voltage box to have metering and detection functions. It records the charging and discharging power and charging and discharging records of the energy storage battery, and is used to calculate the SOC, SOH, and other electrical parameters of the energy storage battery. At the same time, the high-voltage box has an IMD insulation monitoring device to monitor the insulation of the energy storage device during charging and discharging operations, preventing the risk of leakage.

[0034] The human-machine interface unit 4 includes a display screen and buttons, which are mounted on the outer casing of the energy storage device and connected to the control unit 3. The thermal management system 5 includes a cabinet air conditioner and a battery heating film to ensure that the cell temperature remains within the rated operating temperature range during battery charging and discharging. The safety management system 6 includes combustible gas detection, smoke detection, water immersion detection, humidity control within the cabinet, and a fire safety system, including a gas extinguishing device and a sprinkler system. The photovoltaic unit 7 includes an MPPT controller, a solar power panel, and a DC / DC converter. The output of the solar power panel is connected to the DC / DC converter, which is controlled by the MPPT controller. The output of the DC / DC converter is connected to KM3 and KM4 of the high-voltage box. The DC charging interface 8 is a vehicle socket conforming to GB / T 20234.3-2023 standard, with one end connected to the high-voltage box and the other end connected to the vehicle plug of the bidirectional charging pile. The control unit 3 connects to a cloud platform, uploads the current status of the energy storage device and the operating status of each unit component to the cloud platform, executes control commands issued by the cloud platform, and supports OTA remote upgrades via the cloud platform. The energy storage devices can be used in parallel, and multiple energy storage devices can be connected in parallel to form an energy storage battery stack. The control unit communicates with the battery stack's main controller. The main controller aggregates parameters such as SOC and SOH of the energy storage battery stack, calculates the current chargeable / dischargeable capacity and maximum charge / discharge power, and uploads this data to the energy router. It then connects to a virtual power plant via a cloud platform and accepts the virtual power plant's dispatch. Improving the energy storage system of bidirectional charging piles can provide users with various convenient, efficient, and safe energy storage battery charging and discharging modes, increasing the utilization rate of bidirectional charging piles. By participating in the electricity market through bidirectional charging piles for orderly charging and discharging, such as low-storage-high-generation profit generation and voltage regulation services, economic benefits can be achieved. Simultaneously, multiple devices can be used in parallel, and users can install them as needed. They can connect to the virtual power plant via the cloud platform, upload the current chargeable / dischargeable power in real time, and accept the power dispatch control of the virtual power plant to further alleviate the peak load pressure on the local power grid and fill the load gap during off-peak periods. This reduces the peak-to-valley difference in power grid load, making power generation and consumption more balanced and stable.

[0035] This utility model's bidirectional charging pile energy storage device has a DC charging interface, eliminating the need for an additional energy storage converter and reducing user investment costs. It is also compatible with the GB / T 27930.2-2024 communication protocol, allowing direct energy interaction with commercially available bidirectional charging piles. Together with bidirectional charging piles, new energy vehicles, photovoltaic power generation, and local loads, it forms an energy system for industrial and commercial parks. By implementing an orderly charging and discharging strategy, it can effectively alleviate problems such as power grid overload and transformer overload caused by insufficient power capacity in some industrial and commercial parks. Simultaneously, it allows users to stably enjoy the benefits of grid-connected power generation and maximize their access to electricity price discounts. The energy storage device can meet the needs of most user electricity usage scenarios. Multiple energy storage devices are connected in parallel to form an energy storage battery stack. The control unit of the energy storage device communicates with the battery stack's main controller. The main controller aggregates parameters such as SOC and SOH of the energy storage battery stack, calculates the current chargeable and dischargeable capacity and maximum charging and discharging power, and uploads this data to the energy router. Through a cloud platform, it connects to a virtual power plant and receives dispatch from the virtual power plant. In conjunction with virtual power plants, it maintains and alleviates peak load pressure on the local power grid, fills in off-peak loads, reduces the peak-to-valley difference in power grid load, and promotes a more balanced and stable power generation and consumption. Equipped with a human-machine interface unit, it displays the current operating status of the energy storage device to users and provides maintenance personnel with relevant parameter information such as the energy storage batteries, switching units, and safety systems within the device, improving maintenance efficiency and thus reducing maintenance costs.

[0036] Example 1

[0037] like Figure 1 , Figure 2As shown, the bidirectional charging pile rectifies and isolates the power from the three-phase grid to output high-voltage direct current; or it draws power from the energy storage battery and the photovoltaic unit, isolates and inverts it before inputting it into the three-phase grid, and connects to KM1 and KM2 of the high-voltage box through the DC charging interface. The photovoltaic unit draws power from the solar power panel and connects to KM3 and KM4 of the high-voltage box to charge the energy storage battery, or generates power simultaneously with the energy storage battery. The control unit executes an orderly charging and discharging strategy. By controlling the power dispatch switch on the high-voltage power control circuit, it can switch between various charging and discharging modes, such as charging and discharging the energy storage battery, the photovoltaic unit charging the energy storage battery, and the photovoltaic unit and the energy storage power supply discharging simultaneously. It charges the energy storage battery during off-peak hours, selectively charges and discharges during flat hours, and discharges during peak hours, achieving peak-shifting electricity consumption, further reducing peak loads and alleviating the pressure on the grid during peak periods. The human-machine interface unit is used to display relevant parameters such as the current capacity and charging / discharging power of the energy storage device, as well as its current operating status, to users. It also displays the operating status of the energy storage device to technical maintenance personnel, facilitating maintenance and inspection work. The control unit has the function of connecting to a cloud platform, uploading the current status of the energy storage device and the operating status of each unit component to the cloud platform. It supports OTA remote upgrades via the cloud platform and can access a virtual power plant through the cloud platform to receive dispatch from the virtual power plant.

[0038] The energy storage device connects to a bidirectional charging pile via a DC charging interface. When the energy storage device is charging or discharging, the bidirectional charging pile establishes communication with the control unit. The control unit controls the closing of pins KM1 and KM2 in the high-voltage box, allowing the bidirectional charging pile to complete the charging and discharging operation as needed. When the photovoltaic unit has discharge capability, the control unit controls the closing of pins KM1, KM2, KM3, and KM4 in the high-voltage box, enabling the photovoltaic unit to charge the energy storage device or discharge simultaneously with the energy storage device.

[0039] Please see Figure 3 As shown, in this embodiment, the energy storage device, bidirectional charging pile, photovoltaic unit, new energy vehicle, local load, and power grid constitute a local energy system. The high-voltage box includes a pre-charging circuit, shunt, fuse, circuit breaker, and multiple power dispatch switches. The multiple power dispatch switches constitute multiple high-voltage power control circuits. The energy storage device is connected to the high-voltage box through power dispatch switches KM1 and KM2, the photovoltaic unit is connected to the high-voltage box through power dispatch switches KM3 and KM4, and the DC charging interface is connected to the high-voltage box through circuit breaker QF. The control unit executes an orderly charging and discharging strategy. By controlling the power dispatch switches on the high-voltage power control circuit, multiple charging and discharging modes can be switched, such as charging and discharging the energy storage battery, the photovoltaic unit charging the energy storage battery, and the photovoltaic unit and the energy storage power supply discharging simultaneously.

[0040] B2G mode of energy storage battery to grid: The circuit breaker QF is manually closed, and the bidirectional charging pile is connected to the DC charging interface of the energy storage device through the vehicle plug. The control unit communicates with the bidirectional charging pile through the GB / T 27930 protocol to start the discharge operation. The control unit controls the power dispatching switches KM1 and KM2 in the high voltage box to close, and the bidirectional charging pile draws power from the energy storage device and enters the discharge operation process. After isolation conversion and inversion, the power is input into the grid.

[0041] B2V mode of energy storage battery to vehicle: The circuit breaker QF is manually closed, and the bidirectional charging pile 1 is connected to the DC charging interface of the energy storage device through the vehicle plug. The control unit communicates with the bidirectional charging pile 1 through the GB / T 27930 protocol to start the discharge operation. The control unit controls the power dispatching switches KM1 and KM2 in the high voltage box to close. The bidirectional charging pile 1 draws power from the energy storage battery and enters the discharge operation process. After isolation conversion and inversion, the power is input into the power grid and supplies power to the bidirectional charging pile 2. The bidirectional charging pile 2 charges the new energy vehicle.

[0042] B2L ​​mode of energy storage battery to vehicle: The circuit breaker QF is manually closed, and the bidirectional charging pile 1 is connected to the DC charging interface of the energy storage device through the vehicle plug. The control unit communicates with the bidirectional charging pile 1 through the GB / T 27930 protocol to start the discharge operation. The control unit controls the power dispatching switches KM1 and KM2 in the high voltage box to close, and the bidirectional charging pile 1 draws power from the energy storage device and enters the discharge operation process. After isolation conversion and inversion, the power is input into the power grid and then supplies power to the local load.

[0043] V2B mode of energy storage battery to vehicle: The circuit breaker QF is manually closed, and the bidirectional charging pile is connected to the DC charging interface of the energy storage device through the vehicle plug. The bidirectional charging pile 2 draws power from the power battery of the new energy vehicle. After isolation conversion and inversion, the power is input into the power grid and then supplies power to the bidirectional charging pile 1. The control unit communicates with the bidirectional charging pile 1 through the GB / T 27930 protocol to start the charging operation. The control unit controls the power dispatching switches KM1 and KM2 in the high voltage box to close, and the bidirectional charging pile charges the energy storage device, entering the charging operation process.

[0044] Please see Figure 5As shown, the energy storage devices can be used in parallel. Multiple energy storage devices connected in parallel form an energy storage battery stack. The control unit communicates with the battery stack master controller (BAU). The BAU summarizes the SOC, SOH, and other parameters of the energy storage battery stack, calculates the current chargeable / dischargeable capacity and maximum charge / discharge power, and uploads this data to the energy router. It then connects to a virtual power plant via a cloud platform and receives scheduling from the virtual power plant. The BAU executes the ordered charge / discharge strategy issued by the virtual power plant, charging the energy storage devices during off-peak hours, selectively charging and discharging them during flat-price periods, and discharging them during peak hours. This achieves peak-shaving and valley-filling, alleviating peak load pressure on the power grid and establishing a relatively complete energy flow system. It can fully utilize distributed power, improve the efficiency of distributed energy storage charging and discharging, and meet more complex charging and discharging needs of users. In areas with underdeveloped power systems or large power fluctuations, the BAU receives power management from the virtual power plant through the cloud platform and participates in the local power grid's power dispatch to ensure the continuous, stable, and safe operation of the local power grid.

[0045] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An energy storage device for a bidirectional charging pile, characterized in that: The device includes a battery (1) and a control unit (3). The battery (1) is connected to a high-voltage box (2). The high-voltage box (2) is connected to a photovoltaic unit (7) and a DC charging interface (8). The DC charging interface (8) is connected to a bidirectional charging pile. The photovoltaic unit (7) is used to generate electrical energy and transmit it to the high-voltage box (2). The high-voltage box (2) is equipped with a switch for controlling the current flow. The control unit (3) is connected to the battery (1), the high-voltage box (2), the photovoltaic unit (7), and the DC charging interface (8).

2. The energy storage device for a bidirectional charging pile according to claim 1, characterized in that: The battery (1) comprises multiple battery packs connected in series.

3. The energy storage device for a bidirectional charging pile according to claim 1, characterized in that: The switches include power switching switches KM1, KM2, KM3, KM4, and KM5. One end of power switching switch KM1 is connected to one end of power switching switch KM5 and one end of fuse FU1. The other end of fuse FU1 is connected to the positive terminal of battery (1). The other end of power switching switch KM5 is connected to one end of resistor R1. The other end of resistor R1 is connected to the other end of power switching switch KM1, one end of power switching switch KM3, and pin 1 of circuit breaker QF. One end of power switching switch KM2 is connected to one end of shunt FL. The other end of shunt FL is connected to one end of fuse FU2. The other end of fuse FU2 is connected to the battery (1). 1) The negative terminal of the power dispatch switch KM2 is connected to one end of the power dispatch switch KM4 and pin 3 of the circuit breaker QF. The other end of the power dispatch switch KM3 and the other end of the power dispatch switch KM4 are connected to the photovoltaic unit (7). Pin 2 of the circuit breaker QF is connected to the positive terminal of the DC charging interface (8). Pin 4 of the circuit breaker QF is connected to the negative terminal of the DC charging interface (8). The control unit (3) is connected to the power dispatch switch KM1, the power dispatch switch KM2, the power dispatch switch KM3, the power dispatch switch KM4, the power dispatch switch KM5 and the IMD insulation monitoring device. The IMD insulation monitoring device is connected to pin 1 and pin 2 of the circuit breaker QF respectively.

4. The energy storage device for a bidirectional charging pile according to claim 1, characterized in that: The energy storage device also includes a human-machine interaction unit (4) and a housing. The human-machine interaction unit (4) includes a display screen and buttons. The display screen and buttons are installed on the housing of the energy storage device and connected to the control unit (3).

5. The energy storage device for a bidirectional charging pile according to claim 1, characterized in that: The energy storage device also includes a thermal management system (5) and a cabinet. The thermal management system (5) includes a cabinet air conditioner and a battery heating film. The battery heating film is attached to the surface of the battery (1). The cabinet air conditioner is installed in the cabinet of the energy storage device to ensure that the cell temperature is within the rated operating temperature range when the battery (1) is charging and discharging.

6. The energy storage device for a bidirectional charging pile according to claim 1, characterized in that: The energy storage device also includes a safety management system (6), which includes a combustible gas detection device, a smoke detection device, a water immersion detection device, a humidity detection device, and a fire safety system, wherein the fire safety system includes a gas extinguishing device and a sprinkler system.

7. The energy storage device for a bidirectional charging pile according to claim 1, characterized in that: The photovoltaic unit (7) includes an MPPT controller, a solar power generation panel, and a DC / DC converter. The output of the solar power generation panel is connected to the DC / DC converter. The DC / DC converter is controlled by the MPPT controller. The DC / DC converter includes a capacitor C1. The two ends of the capacitor C1 are connected to the solar power generation panel. One end of the capacitor C1 is connected to the drain of the MOSFET Q1. The source of the MOSFET Q1 is connected to one end of the capacitor C2 and the drain of the MOSFET Q2. The other end of the capacitor C2 is connected to one end of the inductor L1. The other end of the inductor L1 is connected to one end of the inductor Lm and pin 4 of the transformer T1. Pin 3 of the transformer T1 is connected to the other end of the inductor Lm, the source of the MOSFET Q2, and the other end of the capacitor C1. Pin 1 of the transformer T1 is connected to the positive terminal of the diode VD1. The negative terminal of the diode VD1 is connected to one end of the capacitor C3 and one end of the resistor Ro. Pin 2 of the transformer T1 is connected to the other end of the capacitor C3 and the other end of the resistor Ro. The two ends of the resistor Ro are connected to the high-voltage box (2).

8. The energy storage device for a bidirectional charging pile according to claim 1, characterized in that: The DC charging interface (8) is a vehicle socket conforming to the GB / T 20234.3-2023 standard. One end is connected to the high-voltage box (2), and the other end is connected to the vehicle plug of the bidirectional charging pile.

9. The energy storage device for a bidirectional charging pile according to claim 1, characterized in that: The control unit (3) is connected to the cloud platform, uploads the current status of the energy storage device to the cloud platform, executes the control commands issued by the cloud platform, and supports OTA cloud platform remote upgrades.

10. The energy storage device for a bidirectional charging pile according to claim 9, characterized in that: The control unit (3) includes a BCU controller.

Images