Energy storage device and charge-discharge control method thereof

Abstract

The application discloses an energy storage device and a charging and discharging control method thereof. The energy storage device comprises a bidirectional charging and discharging interface and a bidirectional charging and discharging control circuit; the bidirectional charging and discharging interface comprises an energy transmission end, a PE end, a CP end and a CC end; the bidirectional charging and discharging control circuit comprises a charging control sub-circuit, a discharging control sub-circuit and a charging and discharging control switch; the control method comprises the following steps: determining the direction of a charging gun connected to the bidirectional charging and discharging interface by detecting the resistance value of the CC end connected to a load; when the bidirectional charging and discharging interface is connected to the power supply side of the charging gun, the charging and discharging control switch is controlled to be connected to the discharging control sub-circuit and the CP end, and the energy storage device is controlled to be in a discharging mode; and / or when the bidirectional charging and discharging interface is connected to the charging side of the charging gun, the charging and discharging control switch is controlled to be connected to the charging control sub-circuit and the CP end, and the energy storage device is controlled to be in a charging mode. The scheme can realize the multiplexing of the charging interface and the discharging interface, simplify the overall structure and improve the stability of the energy storage device.

Description

Technical Field

[0001] This invention relates to the field of charging and discharging technology, and in particular to an energy storage device and its charging and discharging control method. Background Technology

[0002] With the rapid development of the new energy industry, the demand for interaction between electric vehicles and mobile power sources is becoming increasingly diverse, and the interaction between portable energy storage devices and the charging and discharging of electric vehicles has become a key focus of industry research and development.

[0003] In related technologies, portable energy storage devices are typically equipped with a charging interface for connecting to the charging side of the charging gun and a discharging interface for connecting to the power supply side of the charging gun. This provides more charging and discharging methods for portable energy storage devices, enabling them to interact with electric vehicles through charging and discharging.

[0004] However, adding charging and discharging interfaces will affect the portability and miniaturization of energy storage devices, limit the applicable scenarios of energy storage devices, and the charging and discharging circuits are independent of each other. Users may need to manually connect and switch between charging and discharging modes, which is prone to misoperation and poses a high safety risk. Summary of the Invention

[0005] This invention provides an energy storage device and its charging and discharging control method, which enables the reuse of the charging interface and discharging interface of the energy storage device, simplifying the overall structure.

[0006] In a first aspect, the present invention provides a charging and discharging control method for an energy storage device. The energy storage device includes a bidirectional charge / discharge interface and a bidirectional charge / discharge control circuit; the bidirectional charge / discharge interface includes an energy transmission terminal, a PE terminal, a CP terminal, and a CC terminal; the bidirectional charge / discharge control circuit includes a charging control sub-circuit, a discharging control sub-circuit, and a charge / discharge control switch; The control method includes: The direction of the charging gun connected to the bidirectional charging and discharging interface is determined by detecting the resistance value of the load connected to the CC terminal; wherein, the direction of the charging gun includes the power supply side and the charging side; When the bidirectional charging and discharging interface is connected to the power supply side of the charging gun, the charging and discharging control switch is controlled to connect the discharging control sub-circuit and the CP terminal, and the energy storage device is controlled to be in the discharging mode. And / or, When the bidirectional charging and discharging interface is connected to the charging side of the charging gun, the charging and discharging control switch is controlled to connect the charging control sub-circuit and the CP terminal, and the energy storage device is controlled to be in charging mode.

[0007] Optionally, the power supply side of the charging gun includes a power supply interface, and the PE terminal and CC terminal of the power supply interface are shorted together; the charging side of the charging gun includes a gun head interface, and a charging gun load is connected between the PE terminal and CC terminal of the gun head interface. The orientation of the charging gun connected to the bidirectional charging / discharging interface is determined by detecting the resistance value of the load connected to the CC terminal, including: When the resistance of the load connected to the CC terminal is zero, it is determined that the bidirectional charging and discharging interface is connected to the power supply side of the charging gun. And / or, When the resistance value of the load connected to the CC terminal is equal to the resistance value of the charging gun load, it is determined that the bidirectional charging and discharging interface is connected to the charging side of the charging gun.

[0008] Optionally, the control method further includes: When the resistance value of the load connected to the CC terminal is greater than a preset threshold, it is determined that the bidirectional charging and discharging interface is not connected to the charging gun, and the energy storage device is controlled to enter standby mode.

[0009] Optionally, the discharge control sub-circuit includes a first switch and a first resistor; the discharge control sub-circuit is electrically connected to the first terminal of the charge / discharge control switch at a first node; When the bidirectional charging / discharging interface is connected to the power supply side of the charging gun, after controlling the charging / discharging control switch to connect the discharging control sub-circuit and the CP terminal, the control method further includes: The first switch is controlled to connect a fixed voltage terminal and the charge / discharge control switch so that an electrical signal exists at the CP terminal; The voltage of the first node is detected. When the voltage of the first node is less than the voltage of the fixed voltage terminal, it is confirmed that the energy storage device is successfully connected to the device connected to the charging side of the charging gun. After confirming that the energy storage device is successfully connected to the device connected to the charging side of the charging gun, the energy storage device is controlled to discharge through the energy transmission end.

[0010] Optionally, after confirming that the energy storage device is successfully connected to the device connected to the charging side of the charging gun, before controlling the energy storage device to discharge through the energy transmission terminal, the control method further includes: After confirming that the energy storage device is successfully connected to the device connected to the charging side of the charging gun, the voltage of the first node is then monitored. After the voltage at the first node changes from a first voltage value to a second voltage value, the first switch is controlled to connect the PWM signal terminal and the charge / discharge control switch, and a PWM signal is output through the PWM signal terminal.

[0011] Optionally, the charging control sub-circuit includes a second switch, a second resistor, a third resistor, and a diode; the second switch, the second resistor, and the third resistor, which are connected in series, are connected in parallel between the cathode of the diode and ground; the cathode of the diode is connected to a second node, and the anode of the diode is electrically connected to the second terminal of the charging and discharging control switch. When the bidirectional charge / discharge interface is connected to the charging side of the charging gun, after controlling the charge / discharge control switch to connect the charging control sub-circuit and the CP terminal, the control method further includes: The voltage of the second node is detected. After an electrical signal is detected through the second node, it is confirmed that the energy storage device is successfully connected to the device connected to the power supply side of the charging gun. After confirming that the energy storage device is successfully connected to the power supply side of the charging gun, the energy storage device is controlled to charge through the energy transmission terminal.

[0012] Optionally, after confirming that the energy storage device is successfully connected to the device connected to the power supply side of the charging gun, controlling the energy storage device to charge through the energy transmission terminal includes: The second switch is closed to connect the second resistor in parallel with the third resistor. After the second switch is closed, the PWM signal is obtained based on the second node; The energy storage device is controlled to charge through the energy transmission terminal based on the duty cycle of the PWM signal.

[0013] Optionally, the energy storage device may further include a battery module, a battery management module, and an energy conversion module; The energy conversion module includes a DC terminal and an AC terminal. The DC terminal is electrically connected to the battery module through the battery management module, and the AC terminal is electrically connected to the energy transmission terminal through an energy transmission switch. Controlling the energy storage device to be in discharge mode includes: controlling the energy conversion module to switch to inverter mode; Controlling the energy storage device to be in charging mode includes: controlling the energy conversion module to switch to rectification mode.

[0014] Secondly, the present invention provides an energy storage device, comprising: a battery module, a battery management module, an energy conversion module, a controller, a bidirectional charge and discharge control circuit, and a bidirectional charge and discharge interface; the bidirectional charge and discharge interface includes an energy transmission terminal, a PE terminal, a CP terminal, and a CC terminal; The energy conversion module includes a DC terminal and an AC terminal. The DC terminal is electrically connected to the battery module through the battery management module, and the AC terminal is electrically connected to the energy transmission terminal through an energy transmission switch. Both the battery management module and the energy conversion module are communicatively connected to the controller. The bidirectional charge and discharge control circuit includes a charging control sub-circuit, a discharging control sub-circuit, and a charge and discharge control switch. The controller is electrically connected to the first terminal of the charge / discharge control switch via the discharge control sub-circuit, the controller is electrically connected to the second terminal of the charge / discharge control switch via the charging control sub-circuit, and the third terminal of the charge / discharge control switch is electrically connected to the CP terminal; the controller is also electrically connected to the control terminal and the CC terminal of the charge / discharge control switch respectively. The controller is used to execute the charge / discharge control method described in the first aspect.

[0015] Optionally, the energy storage device further includes a charge converter and a discharge converter; The charging converter includes a first charging interface and a second charging interface. The first charging interface is pluggably connected to the bidirectional charging and discharging interface, and the second charging interface is pluggably connected to the charging head interface on the charging side of the charging gun. The discharge converter includes a first discharge interface and a second discharge interface. The first discharge interface is pluggable to the bidirectional charge and discharge interface, and the second discharge interface is pluggable to the power supply interface on the power supply side of the charging gun.

[0016] Optionally, the energy storage device further includes the charging gun; the charging gun includes a gun head interface located on the charging side and a power supply interface located on the power supply side; The charging gun is pluggably connected to the bidirectional charging and discharging interface via the charging converter or the discharging converter.

[0017] The technical solution of this invention determines the direction of the charging gun connected to the bidirectional charging and discharging interface by detecting the resistance value of the load connected to the CC terminal. When the bidirectional charging and discharging interface is connected to the power supply side of the charging gun, the charging and discharging control switch is controlled to connect to the discharging control sub-circuit and the CP terminal, and the energy storage device is controlled to be in discharging mode. When the bidirectional charging and discharging interface is connected to the charging side of the charging gun, the charging and discharging control switch is controlled to connect to the charging control sub-circuit and the CP terminal, and the energy storage device is controlled to be in charging mode. This realizes the reuse of the charging interface and the discharging interface of the energy storage device, which can reduce the number of interfaces of the energy storage device, simplify the overall structure, and improve the safety and stability of the energy storage device. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of an energy storage device provided in Embodiment 1 of the present invention; Figure 2 This is a structural schematic diagram of a charging mode for an energy storage device provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the discharge mode of an energy storage device provided in Embodiment 1 of the present invention; Figure 4 This is a schematic flowchart of a charging and discharging control method for an energy storage device provided in Embodiment 2 of the present invention; Figure 5 This is a schematic flowchart of a charging and discharging control method for an energy storage device provided in Embodiment 3 of the present invention; Figure 6 This is a schematic flowchart of a charging and discharging control method for an energy storage device provided in Embodiment 4 of the present invention. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0020] The terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "on" or "below" another element, it can be formed not only directly on or below the other element, but also indirectly on or below it through intermediate elements. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The term "comprising" and its variations as used in this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0022] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0023] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0024] Example 1 Figure 1 This is a structural schematic diagram of an energy storage device provided in Embodiment 1 of the present invention, as shown below. Figure 1 As shown, the energy storage device includes a battery module 10, a battery management module 20, an energy conversion module 30, a controller 40, a bidirectional charge / discharge control circuit 50, and a bidirectional charge / discharge interface 60. The bidirectional charge / discharge interface 60 includes an energy transmission terminal, a PE terminal, a CP terminal, and a CC terminal. The energy conversion module 30 includes a DC terminal and an AC terminal. The DC terminal is electrically connected to the battery module 10 via the battery management module 20, and the AC terminal is electrically connected to the energy transmission terminal via an energy transmission switch. Both the battery management module 20 and the energy conversion module 30 are communicatively connected to the controller 40. The bidirectional charge / discharge... The electrical control circuit 50 includes a charging control sub-circuit 51, a discharging control sub-circuit 52, and a charging / discharging control switch S4; the controller 40 is electrically connected to the first terminal of the charging / discharging control switch S4 through the discharging control sub-circuit 52, the controller 40 is electrically connected to the second terminal of the charging / discharging control switch S4 through the charging control sub-circuit 51, and the third terminal of the charging / discharging control switch S4 is electrically connected to the CP terminal; the controller 40 is also electrically connected to the control terminal and the CC terminal of the charging / discharging control switch S4 respectively; wherein, the controller 40 is used to execute the charging / discharging control method of any embodiment of the present invention.

[0025] The battery management module 20 can monitor the working status of the battery module 10 and related data such as current, voltage, and power. The energy conversion module 30 can receive external AC power through the AC terminal when the energy storage device is in charging mode, rectify the AC power into DC power, and then charge the battery module 10 through the DC terminal. The energy conversion module 30 can also invert the DC power of the battery module 10 into AC power through the DC terminal when the energy storage device is in discharging mode, and output it to the outside through the AC terminal. The bidirectional charging and discharging interface 60 includes an energy transmission terminal, a PE terminal, a CP terminal, and a CC terminal. The energy transmission terminal can include three-phase live wires (L1, L2, L3) and an N-phase neutral wire. The PE terminal is the grounding terminal of the energy storage device, the CP terminal is the control signal terminal of the energy storage device, and the CC terminal is the connection confirmation terminal of the energy storage device.

[0026] In an optional embodiment, the bidirectional charge / discharge control circuit 50 includes a charging control sub-circuit 51, a discharging control sub-circuit 52, and a charge / discharge control switch S4. The controller 40 can determine the direction of the charging gun connected to the bidirectional charge / discharge interface 60 by detecting the resistance value of the load connected to the CC terminal. When the energy storage device is in charging mode, the charging control sub-circuit 51 is electrically connected to the CP terminal through the charge / discharge control switch S4. When the energy storage device is in discharging mode, the discharging control sub-circuit 52 is electrically connected to the CP terminal through the charge / discharge control switch S4. The battery management module 20 and the energy conversion module 30 are both communicatively connected to the controller 40. According to the control commands issued by the controller 40, the battery management module 20 completes the charge / discharge energy management of the energy storage device, and the energy conversion module 30 switches its working state as needed.

[0027] In an optional embodiment, the discharge control sub-circuit 52 includes a first switch S1 and a first resistor R1; the discharge control sub-circuit 52 and the first terminal of the charge / discharge control switch S4 are electrically connected to the first node N1; the charge control sub-circuit 51 includes a second switch S2, a second resistor R2, a third resistor R3 and a diode D1; the second switch S2, the second resistor R2 and the third resistor R3, which are connected in series, are connected in parallel between the cathode of the diode D1 and ground; the cathode of the diode D1 is connected to the second node N2, and the anode of the diode D1 is electrically connected to the second terminal of the charge / discharge control switch S4.

[0028] When the energy storage device is in discharge mode, the first switch S1 is connected to the fixed voltage terminal and the charge / discharge control switch S4 to ensure an electrical signal at the CP terminal. For example, the voltage of the fixed voltage terminal can be 12V. The 12V electrical signal can be transmitted to the CP terminal of the bidirectional charge / discharge interface 60 through the discharge control sub-circuit 52 and the charge / discharge control switch S4. At this time, the controller 40 can detect the voltage of the first node N1. When the voltage of the first node N1 is less than the voltage of the fixed voltage terminal, it confirms that the energy storage device is successfully connected to the charging side of the charging gun. After the voltage of the first node N1 changes to the second voltage value, the first switch S1 is connected to the PWM signal terminal and the charge / discharge control switch S4, and a PWM signal is output through the PWM signal terminal so that the electric vehicle can determine the maximum discharge current of the energy storage device according to the PWM signal, thereby improving the safety and stability of the energy storage device supplying power to the electric vehicle.

[0029] When the energy storage device is in charging mode, the electrical signal can pass through the CP terminal of the bidirectional charging and discharging interface 60, the charging and discharging control switch S4, and the charging control sub-circuit 51 to the controller 40. At this time, the controller 40 can detect the voltage of the second node N2. After detecting the electrical signal through the second node N2, it confirms that the energy storage device and the device connected to the power supply side of the charging gun are successfully connected, and controls the second switch S2 to close so that the second resistor R2 and the third resistor R3 are connected in parallel. At the same time, the PWM signal is obtained based on the second node N2, and the charging current of the energy conversion module 30 is adjusted according to the duty cycle of the PWM signal to control the energy storage device to charge through the energy transmission end, thereby improving the safety and stability of the charging pile charging the energy storage device.

[0030] Optional, Figure 2 This is a structural schematic diagram of a charging mode for an energy storage device provided in Embodiment 1 of the present invention. Figure 3 This is a structural schematic diagram of the discharge mode of an energy storage device provided in Embodiment 1 of the present invention, as shown below. Figure 2 and Figure 3 As shown, the energy storage device also includes a charging converter and a discharging converter; the charging converter includes a first charging interface and a second charging interface, the first charging interface is pluggably connected to the bidirectional charging and discharging interface 60, and the second charging interface is pluggably connected to the charging head interface on the charging side of the charging gun; the discharging converter includes a first discharging interface and a second discharging interface, the first discharging interface is pluggably connected to the bidirectional charging and discharging interface 60, and the second discharging interface is pluggably connected to the power supply interface on the power supply side of the charging gun.

[0031] The charging converter includes a first charging interface and a second charging interface. The first and second charging interfaces also include an energy transmission end, a PE end, a CP end, and a CC end. When the energy storage device is in charging mode, the first charging interface is pluggably connected to the bidirectional charging and discharging interface 60, and the second charging interface is pluggably connected to the charging head interface on the charging side of the charging gun, so that the grid power can be connected to the bidirectional charging and discharging interface 60 of the energy storage device through the charging pile, the charging gun, and the charging converter, thereby charging the battery module 10.

[0032] The discharge converter includes a first discharge interface and a second discharge interface. The first and second discharge interfaces also include an energy transmission end, a PE end, a CP end, and a CC end. When the energy storage device is in discharge mode, the first discharge interface is pluggably connected to the bidirectional charge and discharge interface 60, and the second discharge interface is pluggably connected to the power supply interface on the power supply side of the charging gun. This allows the electrical energy of the energy storage device to be inverted into AC power by the energy conversion module 30 and then delivered to the on-board charger of the electric vehicle through the bidirectional charge and discharge interface 60, the discharge converter, and the charging gun, thereby powering the electric vehicle.

[0033] Optional, continue to refer to Figure 2 and Figure 3The energy storage device also includes a charging gun; the charging gun includes a gun head interface on the charging side and a power supply interface on the power supply side; the charging gun is pluggably connected to the bidirectional charging and discharging interface 60 via a charging converter or a discharging converter.

[0034] The charging gun's charging head interface and power supply interface both include an energy transmission terminal, a PE terminal, a CP terminal, and a CC terminal. In one embodiment, when the energy storage device is in charging mode, the charging head interface of the charging gun is pluggably connected to the bidirectional charging and discharging interface 60 via a charging converter. The power supply interface of the charging gun's power supply side is connected to the charging pile. The PE and CC terminals of the power supply interface are short-circuited. A charging gun load is connected between the PE and CC terminals of the charging head interface. When the third switch S3 is on, the charging gun load includes an RC resistor. When the third switch S3 is off, the charging gun load includes a fourth resistor R4 and an RC resistor. The energy transmission terminal of the power supply interface is connected to the power supply energy, such as grid power. The power supply control sub-circuit 61 includes a fifth resistor R5 and a fifth switch S5. The power supply control sub-circuit 61 is electrically connected to the CP terminal of the power supply interface at the third node N3, so that the controller 40 and the power supply control device can communicate via PWM duty cycle, improving the safety and stability of the charging pile charging the energy storage device.

[0035] In another embodiment, when the energy storage device is in discharge mode, the power supply interface on the power supply side of the charging gun is pluggably connected to the bidirectional charging and discharging interface 60 via a discharge converter. The charging head interface on the charging side of the charging gun is connected to the electric vehicle. The PE and CC terminals of the power supply interface are short-circuited. A charging gun load is connected between the PE and CC terminals of the charging head interface. When the third switch S3 is turned on, the charging gun load includes an RC resistor. When the third switch S3 is turned off, the charging gun load includes a fourth resistor R4 and an RC resistor. The energy transmission terminal of the charging head interface is connected to the on-board charger. The charging head control sub-circuit 62 includes a sixth switch S6, a sixth resistor R6, a seventh resistor R7, and a second diode D2. The sixth switch S6, the sixth resistor R6, and the seventh resistor R7, which are connected in series, are connected in parallel between the cathode of the second diode D2 and ground. The cathode of the second diode D2 is connected to the vehicle control device at the fourth node N4. The anode of the second diode D2 is electrically connected to the CP terminal of the charging head interface, so that the controller 40 and the vehicle control device can achieve PWM duty cycle communication, thereby improving the safety and stability of the energy storage device supplying power to the electric vehicle.

[0036] In this embodiment, the energy storage device reduces the number of interfaces by setting up a bidirectional charge / discharge control circuit and a charge / discharge control switch. When the controller detects that the bidirectional charge / discharge interface is connected to the power supply side of the charging gun, the charge / discharge control switch connects the discharge control sub-circuit and the CP terminal, and the energy storage device is in discharge mode. The energy conversion module inverts the DC power from the battery module into AC power to power the electric vehicle. When the controller detects that the bidirectional charge / discharge interface is connected to the charging side of the charging gun, the charge / discharge control switch connects the charging control sub-circuit and the CP terminal, and the energy storage device is in charging mode. The energy conversion module receives external AC power, rectifies the AC power into DC power, and then charges the battery module. This embodiment realizes the reuse of the charging and discharging interfaces of the energy storage device, which can reduce the number of interfaces of the energy storage device, simplify the overall structure, and improve the safety and stability of the energy storage device.

[0037] Example 2 Figure 4 This is a flowchart illustrating a charging and discharging control method for an energy storage device according to Embodiment 2 of the present invention. This embodiment can be used to simplify the number of interfaces in an energy storage device, such as... Figure 4 As shown, the control method includes: S110. By detecting the resistance value of the load connected to the CC terminal, the direction of the charging gun connected to the bidirectional charging and discharging interface is determined.

[0038] The charging gun has two orientations: a power supply side and a charging side. When the power supply side of the charging gun is connected to the bidirectional charging and discharging interface 60, the energy storage device is in discharging mode; when the charging side of the charging gun is connected to the bidirectional charging and discharging interface 60, the energy storage device is in charging mode.

[0039] In an optional embodiment, the direction of the charging gun connected to the bidirectional charging and discharging interface is determined by detecting the resistance value of the load connected to the CC terminal, including: when the resistance value of the load connected to the CC terminal is zero, determining the power supply side of the charging gun connected to the bidirectional charging and discharging interface; and / or, when the resistance value of the load connected to the CC terminal is equal to the resistance value of the charging gun load, determining the charging side of the charging gun connected to the bidirectional charging and discharging interface.

[0040] Specifically, since the PE and CC terminals of the charging gun's power supply interface are short-circuited and the PE terminal is grounded, when the resistance value of the load connected to the CC terminal is detected to be zero, it can be determined that the bidirectional charging and discharging interface is connected to the power supply side of the charging gun. Since a charging gun load is connected between the PE and CC terminals of the charging gun's head interface, when the resistance value of the load connected to the CC terminal is detected to be equal to the resistance value of the charging gun load, it can be determined that the bidirectional charging and discharging interface is connected to the charging side of the charging gun. In one embodiment, the third switch S3 is turned on, and the resistance value of the load connected to the CC terminal is equal to the resistance value of the RC resistor. In another embodiment, the third switch S3 is turned off, and the resistance value of the load connected to the CC terminal is equal to the sum of the resistance values ​​of the fourth resistor R4 and the RC resistor.

[0041] The third switch S3 can be a push-button switch integrated inside the charging gun. When the charging gun is pulled out of the bidirectional charging and discharging interface 60, the locking structure of the charging gun causes the third switch S3 to turn off, and the resistance value of the load connected to the CC terminal is equal to the sum of the resistance values ​​of the fourth resistor R4 and the RC resistor. When the charging side of the charging gun is fully inserted into the bidirectional charging and discharging interface 60, the locking structure of the charging gun resets and causes the third switch S3 to turn on, and the resistance value of the load connected to the CC terminal is equal to the resistance value of the RC resistor. At this time, the energy storage device can be further controlled to enter the charging process.

[0042] In an optional embodiment, the control method further includes: when the resistance value of the load connected to the CC terminal is greater than a preset threshold, determining that the bidirectional charging and discharging interface is not connected to the charging gun, and controlling the energy storage device to be in standby mode.

[0043] Specifically, when the resistance value of the load connected to the CC terminal is detected to be greater than a preset threshold, it indicates that the bidirectional charging and discharging interface 60 is in a floating state, the bidirectional charging and discharging interface 60 is not connected to the charging gun, the CC terminal is in an open circuit state, and the energy storage device is in standby mode to reduce the energy consumption of the energy storage device. For example, the preset threshold can be greater than the maximum resistance of the charging gun load, and when the bidirectional charging and discharging interface 60 is not connected to the charging gun, the resistance value of the load connected to the CC terminal can be infinite.

[0044] S120. When the bidirectional charging and discharging interface is connected to the power supply side of the charging gun, the charging and discharging control switch is connected to the discharge control sub-circuit and the CP terminal, and the energy storage device is controlled to be in discharge mode.

[0045] Specifically, by detecting the resistance value of the load connected to the CC terminal, when the bidirectional charging and discharging interface 60 is connected to the power supply side of the charging gun, the charging and discharging control switch S4 is controlled to connect to the discharge control sub-circuit 52 and the CP terminal, and the energy storage device is controlled to be in discharge mode, so that the energy conversion module 30 inverts the DC power of the battery module 10 into AC power to power the electric vehicle.

[0046] S130. When the bidirectional charging and discharging interface is connected to the charging side of the charging gun, the charging and discharging control switch is connected to the charging control sub-circuit and the CP terminal, and the energy storage device is controlled to be in charging mode.

[0047] Specifically, by detecting the resistance value of the load connected to the CC terminal, when the bidirectional charging and discharging interface 60 is connected to the charging side of the charging gun, the charging and discharging control switch S4 is controlled to connect to the charging control sub-circuit 51 and the CP terminal, and the energy storage device is controlled to be in charging mode so that the energy conversion module 30 receives external AC power, and after rectifying the AC power into DC power, it charges the battery module 10.

[0048] This embodiment determines the direction of the charging gun connected to the bidirectional charging and discharging interface by detecting the resistance value of the load connected to the CC terminal. When the bidirectional charging and discharging interface is connected to the power supply side of the charging gun, the charging and discharging control switch is connected to the discharging control sub-circuit and the CP terminal, and the energy storage device is controlled to be in discharging mode. When the bidirectional charging and discharging interface is connected to the charging side of the charging gun, the charging and discharging control switch is connected to the charging control sub-circuit and the CP terminal, and the energy storage device is controlled to be in charging mode. This realizes the reuse of the charging interface and discharging interface of the energy storage device, as well as the automatic identification of the charging gun direction and the automatic switching of the charging and discharging mode of the energy storage device. It can reduce the number of interfaces of the energy storage device, simplify the overall structure, and improve the safety and stability of the energy storage device.

[0049] Example 3 Figure 5 This is a flowchart illustrating a charging and discharging control method for an energy storage device according to Embodiment 3 of the present invention. Based on the above embodiments, this embodiment provides a detailed description of the discharging process of the energy storage device, such as... Figure 5 As shown, the control method includes: S210. By detecting the resistance value of the load connected to the CC terminal, the direction of the charging gun connected to the bidirectional charging and discharging interface is determined.

[0050] S220. When the bidirectional charging and discharging interface is connected to the power supply side of the charging gun, the charging and discharging control switch is connected to the discharge control sub-circuit and the CP terminal.

[0051] S230: Control the first switch to connect the fixed voltage terminal and the charge / discharge control switch so that an electrical signal exists at the CP terminal.

[0052] Specifically, after controlling the charge / discharge control switch S4 to connect the discharge control sub-circuit 52 and the CP terminal, the first switch S1 can be controlled to connect the fixed voltage terminal and the charge / discharge control switch S4. For example, the voltage of the fixed voltage terminal can be 12V. The 12V electrical signal can be transmitted to the CP terminal of the bidirectional charge / discharge interface 60 through the discharge control sub-circuit 52 and the charge / discharge control switch S4, so that there is an electrical signal at the CP terminal, which is convenient for subsequent determination of whether the energy storage device is successfully connected to the electric vehicle.

[0053] In an optional embodiment, before controlling the first switch S1 to connect to the fixed voltage terminal and the charge / discharge control switch S4, the energy storage device can perform a fault self-check on the hardware structure such as the battery module 10, battery management module 20, energy conversion module 30, and controller 40. If no fault is found during the self-check, the discharge process of the subsequent energy storage module continues to be executed. If a fault is found during the self-check, the first switch S1 is prohibited from connecting to the fixed voltage terminal and the charge / discharge control switch S4 to avoid damaging the internal components of the energy storage device and improve the safety of device operation.

[0054] S240. Detect the voltage of the first node. When the voltage of the first node is less than the voltage of the fixed voltage terminal, confirm that the energy storage device and the device connected to the charging side of the charging gun are successfully connected.

[0055] Specifically, the controller 40 can detect the voltage of the first node N1. When the electric vehicle is normally connected to the bidirectional charging / discharging interface 60 of the energy storage device through the charging gun and charging converter, the voltage at the CP terminal will be pulled down, thereby reducing the voltage of the first node N1. When the voltage of the first node N1 is less than the voltage at the fixed voltage terminal, it indicates that the energy storage device is successfully connected to the device connected to the charging side of the charging gun. For example, the voltage at the fixed voltage terminal can be 12V. When the voltage of the first node N1 drops to 9V, the electric vehicle is ready to connect to the energy storage device, and the energy storage device can be controlled to discharge.

[0056] S250: After confirming that the energy storage device is successfully connected to the charging side of the charging gun, control the energy storage device to discharge through the energy transmission end.

[0057] Specifically, after confirming that the energy storage device is successfully connected to the device connected to the charging side of the charging gun, the energy conversion module 30 can invert the DC power of the battery module 10 into AC power. A first energy transmission switch K1, a second energy transmission switch K2, a third energy transmission switch (not shown in the figure), and a fourth energy transmission switch (not shown in the figure) are also provided between the energy conversion module 30 and the energy transmission end. The first energy transmission switch K1, the second energy transmission switch K2, the third energy transmission switch, and the fourth energy transmission switch are turned on so that the electrical energy of the energy conversion module 30 is transmitted to the device connected to the charging side of the charging gun through the energy transmission end.

[0058] In an optional embodiment, after confirming that the energy storage device and the device connected to the charging side of the charging gun are successfully connected, before controlling the energy storage device to discharge through the energy transmission terminal, the control method further includes: after confirming that the energy storage device and the device connected to the charging side of the charging gun are successfully connected, continuing to detect the voltage of the first node; after the voltage of the first node changes from a first voltage value to a second voltage value, controlling the first switch to connect the PWM signal terminal and the charge / discharge control switch, and outputting a PWM signal through the PWM signal terminal.

[0059] Specifically, after confirming a successful connection between the energy storage device and the charging side of the charging gun, the controller 40 can continue to monitor the voltage of the first node N1 to continuously acquire the connection status of the energy storage device and the charging side of the charging gun. When the voltage of the first node N1 changes to the second voltage value, it indicates that the electric vehicle has completed its self-test and is ready to receive power. At this time, the controller connects the first switch S1 to the PWM signal terminal and the charge / discharge control switch S4, and outputs a PWM signal through the PWM signal terminal. This allows the device connected to the charging side of the charging gun to determine the maximum discharge current of the energy storage device based on the PWM signal, improving the safety and stability of the energy storage device supplying power to the electric vehicle. For example, after the electric vehicle completes its self-test and closes the sixth switch S6, when the voltage of the first node N1 drops from 9V to 6V, the electric vehicle is ready to receive power and the energy storage device can be controlled to discharge.

[0060] S260, control the energy conversion module to switch to inverter mode.

[0061] Specifically, when the energy storage device discharges through the energy transmission end, the energy conversion module 30 is switched to inverter mode so that the energy conversion module 30 can invert the DC power of the battery module 10 into AC power and discharge it to the device connected to the charging side of the charging gun through the energy transmission end.

[0062] S270. When the bidirectional charging and discharging interface is connected to the charging side of the charging gun, the charging and discharging control switch is connected to the charging control sub-circuit and the CP terminal, and the energy storage device is controlled to be in charging mode.

[0063] This embodiment controls the first switch to connect the fixed voltage terminal and the charge / discharge control switch to ensure an electrical signal at the CP terminal and detects the voltage of the first node. When the voltage of the first node is less than the voltage of the fixed voltage terminal, it confirms that the energy storage device is successfully connected to the device connected to the charging side of the charging gun. After confirming that the energy storage device is successfully connected to the device connected to the charging side of the charging gun, it controls the energy storage device to discharge through the energy transmission terminal. This helps to accurately confirm the connection status of the energy storage device and the device connected to the charging side of the charging gun and improves the discharge stability of the energy storage device.

[0064] Example 4 Figure 6 This is a flowchart illustrating a charging and discharging control method for an energy storage device according to Embodiment 4 of the present invention. Based on the above embodiments, this embodiment provides a detailed description of the charging process of the energy storage device, such as... Figure 6 As shown, the control method includes: S310. By detecting the resistance value of the load connected to the CC terminal, the direction of the charging gun connected to the bidirectional charging and discharging interface is determined.

[0065] S320: When the bidirectional charging and discharging interface is connected to the power supply side of the charging gun, the charging and discharging control switch is connected to the discharge control sub-circuit and the CP terminal, and the energy storage device is controlled to be in discharge mode.

[0066] S330, when the bidirectional charging and discharging interface is connected to the charging side of the charging gun, the charging and discharging control switch is connected to the charging control sub-circuit and the CP terminal.

[0067] S340. Detect the voltage of the second node. After detecting the electrical signal through the second node, confirm that the energy storage device and the device connected to the power supply side of the charging gun are successfully connected.

[0068] Specifically, after the charge / discharge control switch S4 is connected to the charging control sub-circuit 51 and the CP terminal, the electrical signal can pass through the CP terminal of the bidirectional charge / discharge interface 60, the charge / discharge control switch S4, and the charging control sub-circuit 51 to the controller 40. At this time, the controller 40 can detect the voltage of the second node N2. After detecting the electrical signal through the second node N2, it confirms that the energy storage device and the device connected to the power supply side of the charging gun are successfully connected. For example, when the voltage of the second node N2 is 9V, the energy storage device and the device connected to the power supply side of the charging gun are ready to be connected, and the energy storage device can be controlled to charge.

[0069] S350: After confirming that the energy storage device and the device connected to the power supply side of the charging gun are successfully connected, control the energy storage device to charge through the energy transmission end.

[0070] Specifically, after confirming that the energy storage device and the power supply side of the charging gun are successfully connected, the first energy transmission switch K1, the second energy transmission switch K2, the third energy transmission switch and the fourth energy transmission switch are turned on so that the grid power is transmitted to the energy conversion module 30 through the energy transmission end. The energy conversion module 30 can rectify the AC power into DC power and then charge the battery module 10.

[0071] In an optional embodiment, after confirming that the energy storage device and the device connected to the power supply side of the charging gun are successfully connected, controlling the energy storage device to charge through the energy transmission terminal includes: controlling the second switch to close so that the second resistor and the third resistor are connected in parallel; after controlling the second switch to close, acquiring a PWM signal based on the second node; and controlling the energy storage device to charge through the energy transmission terminal according to the duty cycle of the PWM signal.

[0072] Specifically, after confirming that the energy storage device and the power supply side of the charging gun are successfully connected, the second switch S2 can be closed to connect the second resistor R2 and the third resistor R3 in parallel, thereby reducing the equivalent resistance of the second resistor R2 and the third resistor R3. This changes the voltage of the second node N2, which in turn changes the voltage of the third node N3 in the power supply device. At this time, the power supply control device in the power supply device can control the fifth switch S5 to connect the PWM signal terminal and the fifth resistor R5 to obtain the PWM signal of the power supply device based on the second node N2. The maximum discharge power of the power supply device is determined according to the duty cycle of the PWM signal, and the charging current of the energy conversion module 30 is adjusted accordingly to control the energy storage device to charge through the energy transmission terminal, thereby improving the safety and stability of the charging pile charging the energy storage device.

[0073] In an optional implementation, before closing the second switch S2, the energy storage device can perform a fault self-check on the hardware structure such as the battery module 10, battery management module 20, energy conversion module 30, and controller 40. If no fault is found during the self-check, the charging process of the subsequent energy storage module (such as closing the second switch S2) continues. If a fault is found during the self-check, the second switch S2 is prohibited from closing to avoid damaging the internal components of the energy storage device and improve the safety of the device operation.

[0074] S360, control the energy conversion module to switch to rectification mode.

[0075] Specifically, when the energy storage device is being charged through the energy transmission terminal, the energy conversion module 30 is switched to rectification mode so that the energy conversion module 30 can receive external AC power through the energy transmission terminal and rectify the AC power into DC power to charge the battery module 10.

[0076] This embodiment detects the voltage of the second node. After detecting the electrical signal through the second node, it confirms that the energy storage device is successfully connected to the device connected to the power supply side of the charging gun. After confirming that the energy storage device is successfully connected to the device connected to the power supply side of the charging gun, it controls the energy storage device to charge through the energy transmission end. This helps to accurately confirm the connection status of the energy storage device and the device connected to the power supply side of the charging gun, and improves the charging stability of the energy storage device.

[0077] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A charging and discharging control method for an energy storage device, characterized in that, The energy storage device includes a bidirectional charge / discharge interface and a bidirectional charge / discharge control circuit; the bidirectional charge / discharge interface includes an energy transmission terminal, a PE terminal, a CP terminal, and a CC terminal; the bidirectional charge / discharge control circuit includes a charging control sub-circuit, a discharging control sub-circuit, and a charge / discharge control switch; The control method includes: The direction of the charging gun connected to the bidirectional charging and discharging interface is determined by detecting the resistance value of the load connected to the CC terminal; wherein, the direction of the charging gun includes the power supply side and the charging side; When the bidirectional charging and discharging interface is connected to the power supply side of the charging gun, the charging and discharging control switch is controlled to connect the discharging control sub-circuit and the CP terminal, and the energy storage device is controlled to be in the discharging mode. And / or, When the bidirectional charging and discharging interface is connected to the charging side of the charging gun, the charging and discharging control switch is controlled to connect the charging control sub-circuit and the CP terminal, and the energy storage device is controlled to be in charging mode.

2. The charging and discharging control method for the energy storage device according to claim 1, characterized in that, The power supply side of the charging gun includes a power supply interface, and the PE terminal and CC terminal of the power supply interface are shorted together; the charging side of the charging gun includes a gun head interface, and a charging gun load is connected between the PE terminal and CC terminal of the gun head interface. The orientation of the charging gun connected to the bidirectional charging / discharging interface is determined by detecting the resistance value of the load connected to the CC terminal, including: When the resistance of the load connected to the CC terminal is zero, it is determined that the bidirectional charging and discharging interface is connected to the power supply side of the charging gun. And / or, When the resistance value of the load connected to the CC terminal is equal to the resistance value of the charging gun load, it is determined that the bidirectional charging and discharging interface is connected to the charging side of the charging gun.

3. The charging and discharging control method for the energy storage device according to claim 1, characterized in that, The control method further includes: When the resistance value of the load connected to the CC terminal is greater than a preset threshold, it is determined that the bidirectional charging and discharging interface is not connected to the charging gun, and the energy storage device is controlled to enter standby mode.

4. The charging and discharging control method for an energy storage device according to claim 1, characterized in that, The discharge control sub-circuit includes a first switch and a first resistor; the discharge control sub-circuit is electrically connected to the first terminal of the charge / discharge control switch at a first node; When the bidirectional charging / discharging interface is connected to the power supply side of the charging gun, after controlling the charging / discharging control switch to connect the discharging control sub-circuit and the CP terminal, the control method further includes: The first switch is controlled to connect a fixed voltage terminal and the charge / discharge control switch so that an electrical signal exists at the CP terminal; The voltage of the first node is detected. When the voltage of the first node is less than the voltage of the fixed voltage terminal, it is confirmed that the energy storage device is successfully connected to the device connected to the charging side of the charging gun. After confirming that the energy storage device is successfully connected to the device connected to the charging side of the charging gun, the energy storage device is controlled to discharge through the energy transmission end.

5. The charging and discharging control method for an energy storage device according to claim 4, characterized in that, After confirming that the energy storage device is successfully connected to the device connected to the charging side of the charging gun, before controlling the energy storage device to discharge through the energy transmission terminal, the control method further includes: After confirming that the energy storage device is successfully connected to the device connected to the charging side of the charging gun, the voltage of the first node is then monitored. After the voltage at the first node changes from a first voltage value to a second voltage value, the first switch is controlled to connect the PWM signal terminal and the charge / discharge control switch, and a PWM signal is output through the PWM signal terminal.

6. The charging and discharging control method for an energy storage device according to claim 1, characterized in that, The charging control sub-circuit includes a second switch, a second resistor, a third resistor, and a diode; the second switch, the second resistor, and the third resistor, which are connected in series, are connected in parallel between the cathode of the diode and ground; the cathode of the diode is connected to a second node, and the anode of the diode is electrically connected to the second terminal of the charge / discharge control switch. When the bidirectional charge / discharge interface is connected to the charging side of the charging gun, after controlling the charge / discharge control switch to connect the charging control sub-circuit and the CP terminal, the control method further includes: The voltage of the second node is detected. After an electrical signal is detected through the second node, it is confirmed that the energy storage device is successfully connected to the device connected to the power supply side of the charging gun. After confirming that the energy storage device is successfully connected to the power supply side of the charging gun, the energy storage device is controlled to charge through the energy transmission terminal.

7. The charging and discharging control method for an energy storage device according to claim 6, characterized in that, After confirming that the energy storage device is successfully connected to the device connected to the power supply side of the charging gun, controlling the energy storage device to charge through the energy transmission terminal includes: The second switch is closed to connect the second resistor in parallel with the third resistor. After the second switch is closed, the PWM signal is obtained based on the second node; The energy storage device is controlled to charge through the energy transmission terminal based on the duty cycle of the PWM signal.

8. The charging and discharging control method for an energy storage device according to claim 1, characterized in that, The energy storage device also includes a battery module, a battery management module, and an energy conversion module; The energy conversion module includes a DC terminal and an AC terminal. The DC terminal is electrically connected to the battery module through the battery management module, and the AC terminal is electrically connected to the energy transmission terminal through an energy transmission switch. Controlling the energy storage device to be in discharge mode includes: controlling the energy conversion module to switch to inverter mode; Controlling the energy storage device to be in charging mode includes: controlling the energy conversion module to switch to rectification mode.

9. An energy storage device, characterized in that, include: The battery module, battery management module, energy conversion module, controller, bidirectional charge / discharge control circuit, and bidirectional charge / discharge interface; the bidirectional charge / discharge interface includes an energy transmission terminal, a PE terminal, a CP terminal, and a CC terminal; The energy conversion module includes a DC terminal and an AC terminal. The DC terminal is electrically connected to the battery module through the battery management module, and the AC terminal is electrically connected to the energy transmission terminal through an energy transmission switch. Both the battery management module and the energy conversion module are communicatively connected to the controller. The bidirectional charge and discharge control circuit includes a charging control sub-circuit, a discharging control sub-circuit, and a charge and discharge control switch. The controller is electrically connected to the first terminal of the charge / discharge control switch via the discharge control sub-circuit, the controller is electrically connected to the second terminal of the charge / discharge control switch via the charging control sub-circuit, and the third terminal of the charge / discharge control switch is electrically connected to the CP terminal; the controller is also electrically connected to the control terminal and the CC terminal of the charge / discharge control switch respectively. The controller is used to execute the charge / discharge control method according to any one of claims 1-8.

10. The energy storage device according to claim 9, characterized in that, The energy storage device also includes a charging converter and a discharging converter; The charging converter includes a first charging interface and a second charging interface. The first charging interface is pluggably connected to the bidirectional charging and discharging interface, and the second charging interface is pluggably connected to the charging head interface on the charging side of the charging gun. The discharge converter includes a first discharge interface and a second discharge interface. The first discharge interface is pluggable to the bidirectional charge and discharge interface, and the second discharge interface is pluggable to the power supply interface on the power supply side of the charging gun.

11. The energy storage device according to claim 10, characterized in that, The energy storage device also includes the charging gun; the charging gun includes a gun head interface located on the charging side and a power supply interface located on the power supply side; The charging gun is pluggably connected to the bidirectional charging and discharging interface via the charging converter or the discharging converter.

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