Power equipment

Abstract

The utility model belongs to the technical field of electric power, and provides electric power equipment, which comprises a battery pack, a power converter and an emergency stop device, and is characterized in that the power converter is electrically connected with the battery pack through a power transmission end; and the standby output end of the power converter is electrically connected to the standby input end of the battery pack through a signal transmission line formed by the emergency stop device. The emergency stop device, the power converter, the emergency stop device and the battery pack are additionally arranged on the power equipment to form the signal transmission line of the standby signal, when a fault occurs and emergency stop is needed, the signal transmission line can be disconnected through the emergency stop device, so that the battery pack stops outputting and the power converter stops, and the fault emergency stop control mode is simple and reliable.

Description

Technical Field

[0001] The present application belongs to the field of power electronics technology, and in particular, relates to a power device. Background Art

[0002] In the grid-connected / off-grid home storage system using integrated / split energy storage machines, when the grid and photovoltaic panels are out of power, the energy storage machine with battery pack and power conversion system (PCS) needs to work in off-grid load mode. At this time, the battery pack and PCS need to be manually turned on to make the machine run normally off-grid.

[0003] At present, the mainstream practice in the industry is to wake up the battery by outputting voltage from the PCS to the battery pack port, and to detect and control the battery pack during operation through CAN (Controller Area Network) / RS485 serial communication. However, after a fault occurs, the communication rate is low and the battery pack cannot be shut down immediately, resulting in a larger range of damage to the PCS and battery pack components. Especially for high-power energy storage machines, the steady-state reliable design of the emergency stop function is very important. Utility Model Content

[0004] The purpose of the present application is to provide an electric power device, aiming to solve the problem of unreliable emergency stop function of the electric power device after a fault occurs in the related art.

[0005] In a first aspect, an embodiment of the present application provides an electric power device, comprising a battery pack, a power converter and an emergency stop device, wherein the power converter is electrically connected to the battery pack through a power transmission end, and a standby output end of the power converter is electrically connected to a standby input end of the battery pack through a signal transmission line formed by the emergency stop device;

[0006] The power converter is used to output a standby signal through the standby output end. The battery pack is started according to the standby signal and transmits electric energy to the power converter through the power transmission end when receiving the standby signal. The emergency stop device can operably control the conduction or disconnection of the signal transmission line. The power converter is also used to enter the preset working mode when the signal transmission line is turned off.

[0007] In some embodiments, a mounting base is further included, the power converter and the battery pack are detachably mounted on the mounting base, and a transmission circuit is disposed on the mounting base;

[0008] The standby output terminal of the power converter, the emergency stop device, the transmission circuit and the standby input terminal of the battery pack are electrically connected in sequence to form the signal transmission line; or

[0009] The standby output end of the power converter, the transmission circuit, the emergency stop device and the standby input end of the battery pack are electrically connected in sequence to form the signal transmission line.

[0010] In some embodiments, the power converter includes a first detection circuit, which is connected to the emergency stop device and is used to detect the switching state of the emergency stop device to determine the on / off state of the signal transmission line. The power converter enters the preset working mode when the signal transmission line is disconnected.

[0011] In some embodiments, the power converter also includes a second detection circuit, which is connected to the signal feedback end of the battery pack and is used to detect the standby signal fed back by the battery pack. The power converter enters the preset operating mode when the second detection circuit does not detect the standby signal.

[0012] In some embodiments, the power converter also includes an external expansion enabling circuit, the output end of the external expansion enabling circuit is used to connect to an external expansion battery pack, and is used to output the standby signal to enable the external expansion battery pack to output the voltage, or stop outputting the standby signal to enable the external expansion battery pack to stop outputting the voltage.

[0013] In some embodiments, the detection end of the external expansion enabling circuit is used to connect to the external expansion battery pack, and the power converter is also used to enter the preset working mode when the detection end of the external expansion enabling circuit receives a fault signal returned by the external expansion battery pack.

[0014] In some embodiments, the power converter further includes an external expansion interface for connecting the external expansion battery pack, and the external expansion interface is used to output a pre-charge voltage to the external expansion battery pack to put the external expansion battery pack into a standby state.

[0015] In some embodiments, the emergency stop device includes an operating switch, a first end of the operating switch is electrically connected to a standby output end of the power converter, a second end of the operating switch is electrically connected to a standby input end of the battery pack, and the operating switch is operable to connect or disconnect the first end and the second end.

[0016] In some embodiments, the first detection circuit includes a first switch tube, a bias resistor, a first filter capacitor, a second filter capacitor, a first pull-up resistor, a first current limiting resistor, and a second current limiting resistor;

[0017] The first conduction end of the first switch tube is connected to the first working power supply through the first pull-up resistor, the first conduction end of the first switch tube is also connected to the first end of the first current limiting resistor, and the second conduction end of the first switch tube is grounded; the second end of the first current limiting resistor is connected to the controller of the power converter, the first filter capacitor is connected between the second end of the first current limiting resistor and the second conduction end of the first switch tube, the first end of the second current limiting resistor is connected to the second end of the operating switch, the first end of the operating switch is connected to the second working power supply through the second pull-up resistor, the second end of the second current limiting resistor is connected to the control end of the first switch tube, the bias resistor is connected between the second end of the second current limiting resistor and the second conduction end of the first switch tube, and the second filter capacitor is connected in parallel with the bias resistor.

[0018] In some embodiments, the second detection circuit includes a second switch tube, a third pull-up resistor, a fourth pull-up resistor and a third current limiting resistor;

[0019] A first end of the third pull-up resistor is connected to a third working power source, and a second end of the third pull-up resistor is connected to a signal feedback end of the battery pack;

[0020] The first end of the third current limiting resistor is connected to the signal feedback end of the battery pack, the second end of the third current limiting resistor is connected to the control end of the second switch tube, the first conduction end of the second switch tube is connected to the fourth working power supply through the fourth pull-up resistor, the first conduction end of the second switch tube is connected to the controller of the power converter, and the second conduction end of the second switch tube is grounded.

[0021] Compared with the related art, the embodiments of the present application have the following beneficial effects: an emergency stop device is added to the power equipment, and the power converter, the emergency stop device and the battery pack form a signal transmission line for the standby signal. When a fault occurs and an emergency stop is required, the signal transmission line can be disconnected by the emergency stop device to stop the battery pack output and the power converter enters the preset working mode. This fault emergency stop control method is simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a module of an electric power device provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of a module of an electric power device provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of a module of an electric power device provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of a module of an electric power device provided in an embodiment of the present application;

[0026] Figure 5 A schematic diagram of a module of a power converter in an electric power device provided in an embodiment of the present application;

[0027] Figure 6 for Figure 5 A schematic diagram of a first detection circuit in a power converter shown;

[0028] Figure 7 for Figure 5 A schematic diagram of a second detection circuit in a power converter shown;

[0029] Figure 8 A schematic diagram of a module of a battery pack in an electric power device provided in an embodiment of the present application;

[0030] Fig. 9 A schematic diagram of a module of a power converter in an electric power device provided in an embodiment of the present application;

[0031] Fig.10 A schematic diagram of a module of a power converter and an external battery pack provided in one embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] See also Figure 1 An embodiment of the present application provides an electric power device 10, the electric power device 10 includes an emergency stop device 100, a battery pack 200 and a power converter 300, the power converter 300 and the battery pack 200 are connected via a power transmission end ( Figure 1 The positive and negative terminals + / - shown in the figure are electrically connected, and the standby output end of the power converter 300 is electrically connected to the standby input end of the battery pack 200 through the signal transmission line 110 formed by the emergency stop device 100; the power converter 300 is used to output the standby signal standby through the standby output end, the battery pack 200 is started according to the standby signal standby, and when the standby signal standby is received, the power is transmitted to the power converter 300 through the power transmission end, and the emergency stop device 100 can be operated to control the conduction or shutdown of the signal transmission line 110, and the power converter 300 is also used to enter the preset working mode when the signal transmission line 110 is turned off. The preset working mode includes standby mode, shutdown mode, alarm mode, etc. In the standby mode, the power converter 300 turns off the relevant power conversion function and only retains the power supply of the controller, which is used to detect the operation of the user and perform the corresponding action. In the shutdown mode, the power converter 300 stops outputting power to the load and cuts off the line for power output between the battery pack. In the warning mode, the power converter 300 stops power conversion, stops power output, and outputs a warning message, which is used to indicate that an emergency stop is currently in effect. In other embodiments, the power converter 300 can also enter other operating modes, which at least include the power converter 300 shutting down the power conversion function and stopping power output.

[0037] The battery pack 200 may be one or more, such as Figure 2 The power equipment 10 shown in the figure has a power converter 300 and several (internal) battery packs 200 stacked together to form an integrated energy storage device; and an external battery pack 20 can also be configured, each of which contains an EMS (Energy Management System) and provides a power interface + / - and a control interface CTL. Figure 3As shown, another power device 10 includes an external power converter 300 and a split energy storage device configured with a plurality of battery packs 200, and can also manage multiple external battery packs 20 in a coordinated manner.

[0038] An emergency stop device 100 is added to the power equipment 10, and the power converter 300, the emergency stop device 100 and the battery pack 200 form a signal transmission line 110 of a standby signal standby (taking high level as an example). When a fault occurs and an emergency stop is required, the signal transmission line 110 can be disconnected by the emergency stop device 100 to stop the output of the battery pack 200 and shut down the power converter 300. This fault emergency stop control method is simple and reliable.

[0039] See also Figure 4 In some embodiments, the power device 10 further includes a mounting base 400, on which the power converter 300 and the battery pack 200 are detachably mounted, and a transmission circuit 401 for transmitting related signals is disposed on the mounting base 400.

[0040] The standby output terminal of the power converter 300, the emergency stop device 100, the transmission circuit 401 and the standby input terminal of the battery pack 200 are electrically connected in sequence to form a signal transmission line 110; or the standby output terminal of the power converter 300, the transmission circuit 401, the emergency stop device 100 and the standby input terminal of the battery pack 200 are electrically connected in sequence to form a signal transmission line 110.

[0041] The mounting base 400 is a device such as a base or an end cover for fixing the power converter 300 and the battery pack 200. In the present application, the signal transmission line 110 is introduced into the mounting base 400 to detect whether the mounting base 400, the battery pack 200 and the power converter 300 are correctly installed, so as to detect whether the cable used for signal transmission is broken, poorly plugged or poorly contacted. The standby signal standby is introduced into the mounting base 400, and the standby signal standby is transmitted through the transmission circuit 401 and then transmitted back to the power converter 300 through the battery pack 200 to ensure that the mounting base 400, the battery pack 200 and the power converter 300 are correctly installed and installed in place. Among them, the transmission circuit 401 can realize signal transmission through a jumper circuit, or the transmission circuit 401 includes a 0 ohm resistor. In actual application, the transmission circuit 401 can adopt a circuit that can realize signal transmission without interfering with the signal.

[0042] It should be noted that in the present application, the power converter 300, the battery pack 200, and the mounting base 400 are independent components, and the power converter 300 and the battery pack 200, and the battery pack 200 and the mounting base 400 are connected in a detachable manner to transmit signals and power. For example, the power converter 300 and the battery pack 200 can be connected by a probe connector (pogo pin), and the battery pack 200 and the mounting base 400 can also be connected by a pogo pin. In some embodiments, the emergency stop device 100 is disposed on the power converter 300.

[0043] See also Figure 5 In some embodiments, the power converter 300 includes a first detection circuit 310, which is connected to the emergency stop device 100 and is used to detect the switch state of the emergency stop device 100 to determine the on / off state of the signal transmission line 110. When the signal transmission line 110 is disconnected, the power converter 300 enters a preset working mode, such as a shutdown mode. The first detection circuit 310 is mainly used to detect the disconnection of the signal transmission line 110 segment between the mounting base 400 and the standby output end of the power converter 300 and the emergency stop device 100, and transmits it to the controller 302 (MCU) of the power converter 300. When the MCU 302 detects that the signal transmission line 110 is disconnected, it can report a fault and shut down, verifying the reliability of the standby signal transmission, that is, verifying the installation of the power equipment and the reliability of the emergency stop function.

[0044] See also Figure 5 In some embodiments, the power converter 300 further includes a second detection circuit 320, which is connected to the signal feedback end of the battery pack 200 and is used to detect the standby signal standby fed back by the battery pack 200. When the second detection circuit 320 does not detect the standby signal standby, the power converter 300 enters a preset working mode, such as a shutdown mode. The second detection circuit 320 is mainly used to detect the disconnection of the signal transmission line 110 segment between the mounting base 400 and the signal feedback end of the battery pack 200, and transmit it to the controller 302 (MCU) of the power converter 300. When the MCU 302 detects that the signal transmission line 110 is disconnected, it can report a fault and shut down, verifying the reliability of the transmission of the standby signal standby, that is, verifying the reliability of the installation and emergency stop function of the power equipment.

[0045] See also Figure 6In some embodiments, the emergency stop device 100 includes an operating switch SW, a first end of the operating switch SW is electrically connected to the standby output end of the power converter 300, a second end of the operating switch SW is electrically connected to the standby input end of the battery pack 200 (through the mounting base 400), and the operating switch SW can be operated to connect or disconnect the first end and the second end. The operating switch SW is, for example, a switch device with high reliability and easy operation, such as a knob switch, a knife switch, or a button switch.

[0046] See also Figure 6 In some embodiments, the first detection circuit 310 includes a first switch tube Q1, a bias resistor R1, a first filter capacitor C1, a second filter capacitor C2, a first pull-up resistor R2, a first current limiting resistor R3, and a second current limiting resistor R4. The first conduction end of the first switch tube Q1 is connected to the first working power supply VCC1 through the first pull-up resistor R2, the first conduction end of the first switch tube Q1 is also connected to the first end of the first current limiting resistor R3, and the second conduction end of the first switch tube Q1 is grounded. The second end of the first current limiting resistor R3 constitutes the output end of the first detection circuit 310, which is used to connect the controller 302 of the power converter 300, and the first filter capacitor C1 is connected between the second end of the first current limiting resistor R3 and the second conduction end of the first switch tube Q1. The first end of the second current limiting resistor R4 is connected to the second end of the operating switch SW, the second end of the second current limiting resistor R4 is connected to the control end of the first switch tube Q1, and the first end of the operating switch SW is connected to the second working power supply VCC2, wherein the first end of the operating switch SW is connected to the second working power supply VCC2 through the pull-up resistor R5. The bias resistor R1 is connected between the second end of the second current limiting resistor R4 and the second conduction end of the first switch tube Q1, and the second filter capacitor C2 is connected in parallel with the bias resistor R1. In this embodiment, the first working power supply VCC1 can be a working power supply that provides a 3.3V voltage, and the second working power supply VCC2 can be a working power supply that provides a 5V voltage. In other embodiments, the first working power supply VCC1 and the second working power supply VCC2 can also provide voltages of other values.

[0047] The first switch tube Q1 is, for example, an N-channel MOS tube. When the operating switch SW is turned on, the gate of the N-channel MOS tube (i.e., the control end of the first switch tube Q1) receives a bias voltage and then conducts, so that the controller 302 of the power converter 300 switches from receiving a high level to a low level indicating that the signal transmission line 110 is turned on. If the operating switch SW is turned off, the signal transmission line 110 is disconnected, or there is no standby signal standby output, the N-channel MOS tube is turned off, and the controller 302 of the power converter 300 receives a high level, indicating that the signal transmission line 110 is disconnected, and a fault may be reported and the machine may be shut down, thereby verifying the reliability of the transmission of the standby signal standby, that is, verifying the reliability of the installation of the power equipment and the emergency stop function.

[0048] See also Figure 4 and Figure 7 In some embodiments, the second detection circuit 320 includes a second switch tube Q2, a third pull-up resistor R6, a fourth pull-up resistor R7, and a third current limiting resistor R8. The first end of the third pull-up resistor R6 is connected to the third working power supply VCC3, and the second end of the third pull-up resistor R6 is connected to the signal feedback end of the battery pack 200. The first end of the third current limiting resistor R8 is connected to the signal feedback end of the battery pack 200, and the second end of the third current limiting resistor R8 is connected to the control end of the second switch tube Q2. The first conduction end of the second switch tube Q2 is connected to the fourth working power supply VCC4 through the fourth pull-up resistor R7, and the first conduction end of the second switch tube Q2 constitutes the output end of the second detection circuit 320, which is used to be connected to the controller 302 of the power converter 300, and the second conduction end of the second switch tube Q2 is grounded. In this embodiment, the third working power supply VCC3 can be a working power supply that provides a 5V voltage, and the fourth working power supply VCC4 can be a working power supply that provides a 3.3V voltage. In other embodiments, the third working power supply VCC3 and the fourth working power supply VCC4 can also provide voltages of other values.

[0049] The second switch tube Q2 is, for example, an N-channel MOS tube. When the signal transmission line 110 is connected and there is a signal transmission line 110, the gate of the N-channel MOS tube (i.e., the control end of the second switch tube Q2) is turned on after receiving the bias voltage, so that the controller 302 of the power converter 300 switches from receiving a high level to a low level indicating that the signal transmission line 110 is connected. If the operating switch SW is turned off, the signal transmission line 110 is disconnected, or there is no standby signal standby output, the N-channel MOS tube is turned off, and the controller 302 of the power converter 300 receives a high level, indicating that the signal transmission line 110 is disconnected, and a fault may be reported and the machine may be shut down, which verifies the reliability of the transmission of the standby signal standby, that is, verifies the reliability of the installation of the power equipment and the emergency stop function.

[0050] In the embodiment of the present application, when the battery pack 200 shown needs to be configured with a power converter 300 product of different power, the interface of the battery pack 200 and the power converter 300 needs to remain consistent. The following is an example of an electric power device consisting of an integrated energy storage machine and an external expansion battery pack 20 to further illustrate the embodiment of the present application. In this embodiment, the emergency stop device 100 is provided on the power converter 300, and the power converter 300 is provided with a power button (Keystart button) for starting up.

[0051] See also Figure 8 and Fig. 9When the power converter 300 and the internal battery pack 200 of the integrated energy storage machine 10 are both in standby mode, it is necessary to press the Keystart button on the power converter 300 for several seconds. Figure 8 When the internal battery pack 200 receives the key start button signal, the flyback circuit 202 is activated, and the flyback circuit 202 outputs an 8V voltage 203 to the Buck circuit 303 of the power converter 300, and the standby signal Standby is pulled up to 5V. The flyback circuit 202 also outputs a supply voltage Vcc to the microcontroller unit (MCU) 201 of the internal battery pack 200. After the MCU 201 passes the self-test, it starts the DAB converter (Dual Active Bridge) 205 to output a high voltage of 800V ( Figure 8 The power converter 300 receives the 800V high voltage input ( Fig. 9 When the HighVolIn in the power converter 300 is on, the auxiliary power supply 305 of the power converter 300 is started, outputs 12V to the MCU 302 and other devices requiring power, and outputs 56V to the Figure 8 The flyback circuit 202 of the internal battery pack 200 is disconnected from the battery 48V output (power is supplied by the power converter 300 during normal operation, which can save energy). After the power converter 300 detects the 800V input voltage, it starts off-grid load operation.

[0052] When the power converter 300 has an external power input (such as a photovoltaic panel or a power grid), the auxiliary power supply 305 of the power converter 300 outputs 56V to the flyback circuit 202 of the internal battery pack 200. After the flyback circuit 202 of the internal battery pack 200 works, it outputs 8V voltage to the power converter 300. The power converter 300 converts the 8V voltage input to the flyback circuit 202 of the internal battery pack 200 into a 5V voltage through the Buck circuit 303, and pulls the standby signal Standby high. The MCU 201 of the internal battery pack 200 detects the Standby signal ( Figure 8 and Fig. 9 After the Standby in the power converter 200 is pulled high, the self-check starts, and the DAB converter 205 is controlled to output 800V high voltage to the power converter 300. After the power converter 300 detects the 800V input voltage, the off-grid load operation is started.

[0053] When the power converter 300 detects a fault and needs to shut down, the MCU 302 of the power converter 300 controls the optocoupler (i.e., photocoupler) 304 to pull down the standby signal Standby to 0V by outputting the StandbyEn signal. At this time, after the internal battery pack 200 detects that the standby signal Standby is pulled low, it quickly shuts down the DAB converter 205 to prevent damage to the components of the power converter 300 and prevent the power converter 300 from losing control. Because the standby signal Standby is pulled low, Figure 8 The battery pack shown will also stop working, stop outputting 800V voltage, and enter the corresponding working mode to wait for the next startup.

[0054] See also Fig.10 In some embodiments, the power converter 300 also includes an external expansion enabling circuit 330, the output end of the external expansion enabling circuit 330 is used to connect to the external expansion battery pack 20, and is used to output a standby signal standby to enable the external expansion battery pack 20 to output a voltage, or stop outputting the standby signal standby to enable the external expansion battery pack 20 to stop outputting a voltage.

[0055] In one embodiment, the external expansion enabling circuit 330 includes a first isolation device, the input end of the first isolation device receives the standby signal standby, and the output end constitutes the output end of the external expansion enabling circuit 330. When receiving the standby signal standby, the external expansion enabling circuit 330 outputs the enabling signal PCStoBP to the external expansion battery pack 20. It can be understood that the first isolation device can be a photoelectric coupler, and the level state of the standby signal standby and the enabling signal PCStoBP can be the same or opposite.

[0056] In some embodiments, the detection end of the external expansion enabling circuit 330 is used to connect to the external expansion battery pack 20, and the power converter 300 is also used to enter a preset working mode when the detection end of the external expansion enabling circuit 330 receives a fault signal BPtoPCS returned by the external expansion battery pack 20.

[0057] In one embodiment, the external expansion enabling circuit 330 includes a second isolation device and a switch tube Q3, the input end of the second isolation device constitutes the detection end of the external expansion enabling circuit 330, and the output end is connected to the control end of the switch tube Q3. When the second isolation device receives the fault signal BPtoPCS returned by the external expansion battery pack 20, it controls the switch tube Q3 to turn on and pull down the standby signal standby. When the power converter 300 detects that the standby signal standby is pulled low, indicating that a fault occurs and the power converter needs to shut down, the MCU 302 of the power converter 300 controls the optocoupler 304 to pull down the standby signal Standby to 0V by outputting the StandbyEn signal. When the enable signal PCStoBP changes, the external expansion battery pack 20 quickly shuts down the DAB converter 405 to prevent damage to the components of the power converter 300 and prevent the power converter 300 from being out of control.

[0058] In some embodiments, the power converter 300 further includes an external expansion interface for connecting to the external expansion battery pack 20 , and the external expansion interface is used to output a pre-charge voltage to the external expansion battery pack 20 to put the external expansion battery pack 20 into a standby state.

[0059] See also Fig.10 When the capacity of the internal battery pack 200 of the integrated energy storage machine is insufficient and an external battery pack 20 is required, the control of the external battery pack 20 is supplemented based on the startup and control of the power converter 300 and the internal battery pack 200 .

[0060] Typically, the external battery pack 20 has an independent auxiliary power supply interface and a control interface. Fig.10 As shown, the power converter 300 outputs a pre-charge voltage through the pre-charge port of the external battery pack 20 to wake up all the external battery packs 20, and the external battery packs 20 enter a standby working state.

[0061] When the external battery pack 20 receives the enable signal PCStoBP input by the power converter 300, it is isolated by the third isolation device 407 and the isolated enable signal PCStoBP is transmitted to the MCU 401. When the MCU 401 of the external battery pack 20 detects the isolated enable signal PCStoBP, it powers on and enters the waiting self-test state. After the MCU 407 completes the self-test, it controls the DAB converter 405 to convert the voltage output by the battery module 406 to output 800V voltage ( Fig.10The external battery pack 20 receives the HighVolOut in the power converter 300 and sends the HighVolOut in the power converter 300 to the power converter 300. When a fault occurs in the operation of the power converter 300, the standby signal Standby will be pulled low. At this time, the standby signal Standby is level-converted by the first isolation device and outputs the level-converted enable signal PCStoBP. After receiving the level-converted enable signal PCStoBP, the external battery pack 20 shuts off its own 800V voltage output to prevent further damage to the power converter 300.

[0062] When one or more of the external battery packs 20 fail, the faulty machine shuts down, notifies through the fault signal BPtoPCS and pulls down the standby signal Standby. After the power converter 300 detects that the standby signal Standby is pulled low, it shuts down immediately to avoid further damage to the power converter 300 and the external battery pack 20.

[0063] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An electric power device, characterized in that: The device comprises a battery pack, a power converter and an emergency stop device, wherein the power converter is electrically connected to the battery pack through a power transmission end, and a standby output end of the power converter is electrically connected to a standby input end of the battery pack through a signal transmission line formed by the emergency stop device; The power converter is used to output a standby signal through the standby output end. The battery pack is started according to the standby signal and transmits electric energy to the power converter through the power transmission end when receiving the standby signal. The emergency stop device can operably control the conduction or disconnection of the signal transmission line. The power converter is also used to enter a preset working mode when the signal transmission line is turned off.

2. The electric power equipment according to claim 1, characterized in that: It also includes a mounting base, the power converter and the battery pack are detachably mounted on the mounting base, and a transmission circuit is disposed on the mounting base; The standby output terminal of the power converter, the emergency stop device, the transmission circuit and the standby input terminal of the battery pack are electrically connected in sequence to form the signal transmission line; or The standby output end of the power converter, the transmission circuit, the emergency stop device and the standby input end of the battery pack are electrically connected in sequence to form the signal transmission line.

3. The electric power equipment according to claim 2, characterized in that: The power converter includes a first detection circuit, which is connected to the emergency stop device and is used to detect the switch state of the emergency stop device to determine the on / off state of the signal transmission line. The power converter enters the preset working mode when the signal transmission line is disconnected.

4. The electric power equipment according to claim 2 or 3, characterized in that: The power converter also includes a second detection circuit, which is connected to the signal feedback end of the battery pack and is used to detect the standby signal fed back by the battery pack. The power converter enters the preset operating mode when the second detection circuit does not detect the standby signal.

5. The electric power equipment according to claim 2, characterized in that: The power converter also includes an external expansion enabling circuit, the output end of which is used to connect to the external expansion battery pack, and is used to output the standby signal to enable the external expansion battery pack to output voltage, or stop outputting the standby signal to enable the external expansion battery pack to stop outputting voltage.

6. The electric power equipment according to claim 5, characterized in that: The detection end of the external expansion enabling circuit is used to connect to the external expansion battery pack, and the power converter is also used to enter the preset working mode when the detection end of the external expansion enabling circuit receives a fault signal returned by the external expansion battery pack.

7. The electric power equipment according to claim 5 or 6, characterized in that: The power converter further includes an external expansion interface for connecting the external expansion battery pack, and the external expansion interface is used to output a pre-charging voltage to the external expansion battery pack to put the external expansion battery pack into a standby state.

8. The electric power equipment according to claim 3, characterized in that: The emergency stop device includes an operating switch, a first end of the operating switch is electrically connected to the standby output end of the power converter, a second end of the operating switch is electrically connected to the standby input end of the battery pack, and the operating switch can be operated to connect or disconnect the first end and the second end.

9. The electric power device according to claim 8, characterized in that: The first detection circuit includes a first switch tube, a bias resistor, a first filter capacitor, a second filter capacitor, a first pull-up resistor, a first current limiting resistor and a second current limiting resistor; The first conduction end of the first switch tube is connected to the first working power supply through the first pull-up resistor, the first conduction end of the first switch tube is also connected to the first end of the first current limiting resistor, and the second conduction end of the first switch tube is grounded; the second end of the first current limiting resistor is connected to the controller of the power converter, the first filter capacitor is connected between the second end of the first current limiting resistor and the second conduction end of the first switch tube, the first end of the second current limiting resistor is connected to the second end of the operating switch, the first end of the operating switch is connected to the second working power supply, the second end of the second current limiting resistor is connected to the control end of the first switch tube, the bias resistor is connected between the second end of the second current limiting resistor and the second conduction end of the first switch tube, and the second filter capacitor is connected in parallel with the bias resistor.

10. The electric power equipment according to claim 4, characterized in that: The second detection circuit includes a second switch tube, a third pull-up resistor, a fourth pull-up resistor and a third current limiting resistor; A first end of the third pull-up resistor is connected to a third working power source, and a second end of the third pull-up resistor is connected to a signal feedback end of the battery pack; The first end of the third current limiting resistor is connected to the signal feedback end of the battery pack, the second end of the third current limiting resistor is connected to the control end of the second switch tube, the first conduction end of the second switch tube is connected to the fourth working power supply through the fourth pull-up resistor, the first conduction end of the second switch tube is also connected to the controller of the power converter, and the second conduction end of the second switch tube is grounded.

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