Wake-up circuit, battery management system, and battery system

Abstract

To provide a wake-up circuit, a battery management system, and a battery system that realize a wake-up function based on an external power signal.SOLUTION: A wake-up circuit 10 includes a power supply unit, a wake-up signal generation unit connected to the power supply unit, a switch driving circuit, a switch M, and a power supply circuit connected to the switch. The power supply unit is connected to an external power supply and supplies power to the wake-up signal generation unit based on the external power supply, and the wake-up signal generation unit is connected to the external power supply and generates a wake-up signal based on the external power supply. The switch driving circuit is connected to the power supply unit and the wake-up signal generating unit. The switch is connected to the switch driving circuit and performs conduction and disconnection based on a control signal of the switch driving circuit. The power supply circuit is connected to the battery module via a switch.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present application relates to the field of battery technology, and more particularly to wake-up circuits, battery management systems and battery systems. [Background technology]

[0002] A Battery Management System (BMS) can manage and control the battery module and prevent the battery from overcharging and over-discharging. The BMS includes a Battery Control Unit (BCU) and a Battery Management Unit (BMU), and the battery module supplies power to the BCU and BMU. When the BMS is not in use, the BCU is powered down and enters a shutdown state, and the BMU enters a sleep state. When the BMS needs to be used, the BMS needs to be woken up. Summary of the Invention

[0003] The embodiments of the present application provide a wake-up circuit, a battery management system and a battery system, which can realize a wake-up function based on an external power signal.

[0004] In a first aspect, an embodiment of the present application provides a wake-up circuit, the wake-up circuit including: a power supply unit; a wake-up signal generating unit connected to the power supply unit; a driving unit; a switch; and a power supply circuit connected to the switch, wherein the power supply unit is configured to be connected to an external power source and powers the wake-up signal generating unit based on the external power source; the wake-up signal generating unit is configured to be connected to the external power source and generates a wake-up signal based on the external power source; the driving units are respectively connected to the power supply unit and the wake-up signal generating unit, and the driving units include switch driving circuits; the switch is connected to the switch driving circuit and configured to perform conduction and cut-off based on a control signal of the switch driving circuit; and the power supply circuit is configured to be connected to a battery module via the switch.

[0005] According to the wake-up circuit provided in the embodiments of the present application, when an external power source has power and is connected to the power supply unit, the power provided by the external power source is input to the power supply unit, the power supply unit processes the power from the external power source and outputs wake-up power, the wake-up power supplies the wake-up signal generating unit and the driving unit, the wake-up signal generating unit starts to operate and generates a wake-up signal according to the power provided by the external power source, the driving unit starts to operate, the switch driving circuit generates a control signal for turning on the switch according to the wake-up signal generated by the wake-up signal generating unit, the switch becomes conductive after receiving the control signal for turning on the switch from the switch driving circuit, after the switch becomes conductive, the electrical connection between the battery module and the power supply circuit is established, the power supply circuit is in an operating state, and the power supply circuit generates power to supply power to the battery management system, thereby realizing the wake-up of the battery management system.

[0006] In one possible implementation of the first aspect, the wake-up signal terminates after a predetermined time.

[0007] In one possible embodiment of the first aspect, the switch drive circuit includes an isolated switch driver, and the isolated switch driver includes a primary power supply voltage pin, a secondary power supply voltage pin, a signal input pin, and a signal output pin.

[0008] The power supply units are respectively connected to a primary power supply voltage pin and a secondary power supply voltage pin, the signal input pin is connected to the wake-up signal generating unit, and the signal output pin is connected to the switch.

[0009] In one possible embodiment of the first aspect, the driving unit includes a microprocessor connected to the power supply circuit, and a signal latch unit connected to the microprocessor and the signal input pin, respectively.

[0010] In one possible embodiment of the first aspect, the signal latch unit and the wake-up signal generating unit are electrically connected to a first node, and the first node is electrically connected to the signal input pin.

[0011] In one possible embodiment of the first aspect, the signal latch unit includes a D flip-flop.

[0012] In one possible embodiment of the first aspect, the wake-up signal generating unit includes a first capacitor, a first resistor, and a second resistor, a first end of the first resistor and a first end of the second resistor are connected to a second node, the second node is configured to be connected to an external power source, and the second end of the first resistor is connected to the first end of the first capacitor.

[0013] The wake-up signal generating unit includes a third resistor, a fourth resistor, a fifth resistor and a first switch, a first end of the third resistor and a first end of the fourth resistor connected to a third node, the third node connected to a second end of the first capacitor, a second end of the third resistor connected to a first reference ground, a second end of the fourth resistor connected to a first pole of the first switch, a second pole of the first switch connected to the first reference ground, a second end of the second resistor connected to a first end of the fifth resistor, and a second end of the fifth resistor connected to a third pole of the first switch.

[0014] The wake-up signal generating unit includes a first optocoupler, a sixth resistor, and a seventh resistor, wherein the first pin of the first optocoupler is respectively connected to the second end of the second resistor and the first end of the fifth resistor, the second pin of the first optocoupler is respectively connected to the third pole of the first switch and the second end of the fifth resistor, the third pin of the first optocoupler is connected to the second reference ground via the sixth resistor, and the fourth pin of the first optocoupler is connected to the power supply unit via the seventh resistor.

[0015] The wake-up signal generating unit includes a second switch, a third switch, an eighth resistor, and a ninth resistor, wherein the first pole of the second switch is connected to the third pin of the first optocoupler via the eighth resistor, the second pole of the second switch is connected to the second reference ground, the third pole of the second switch is connected to the first pole of the third switch via the ninth resistor, the second pole of the third switch is connected to the power supply unit, and the third pole of the third switch is connected to the switch driving circuit.

[0016] In one possible embodiment of the first aspect, the wake-up signal generating unit includes a tenth resistor, a first end of which is respectively connected to a second end of the first resistor and a first end of the first capacitor, and a second end of which is connected to a first reference ground.

[0017] In one possible embodiment of the first aspect, the first switch is an NPN transistor or an N-type FET, the second switch is an NPN transistor or an N-type FET, and the third switch is a PNP transistor or a P-type FET.

[0018] When the first switch is an NPN transistor, the wake-up signal generating unit includes a first diode, and the first diode and a fourth resistor are connected in series between the first pole of the first switch and the third node.

[0019] Here, the anode of the first diode is connected to the third node, and the cathode of the first diode is connected to the first pole of the first switch.

[0020] In one possible embodiment of the first aspect, the wake-up circuit includes a wake-up identification unit, the wake-up identification unit is connected to the microprocessor, and the wake-up identification unit is configured to generate a wake-up identification signal based on an external power source and transmit the wake-up identification signal to the microprocessor.

[0021] In one possible embodiment of the first aspect, the wake-up identification unit includes a second optocoupler, an eleventh resistor, and a twelfth resistor, wherein the first pin of the second optocoupler is configured to be connected to an external power supply via the eleventh resistor, the second pin of the second optocoupler is connected to a first reference ground, the third pin of the second optocoupler is connected to the microprocessor, the third pin of the second optocoupler is further connected to a second reference ground via the twelfth resistor, and the fourth pin of the second optocoupler is configured to be connected to the first voltage.

[0022] In one possible embodiment of the first aspect, the wake-up circuit further includes a second diode, and the wake-up identification unit and the wake-up signal generating unit are configured to be connected to an external power source via the second diode.

[0023] In one possible embodiment of the first aspect, the power supply unit includes a first regulator, a first transformer unit, and a second transformer unit, wherein the input end of the first regulator is configured to be connected to an external power supply, the output end of the first regulator is connected to the input end of the first transformer unit, the output end of the first transformer unit is connected to the wake-up signal generating unit, and the input end of the second transformer unit is connected to the external power supply via the second regulator, or the input end of the second transformer unit is connected to the output end of the first regulator via the first transformer unit, and the output end of the second transformer unit is connected to the driving unit, wherein the first transformer unit includes a first transformer driving circuit and a first transformer connected to each other, and the second transformer unit includes a second transformer driving circuit and a second transformer connected to each other.

[0024] In a second aspect, based on the same inventive concept, an embodiment of the present application further provides a battery management system, which includes the wake-up circuit according to the first aspect or any one of the embodiments of the first aspect.

[0025] In a third aspect, based on the same inventive concept, an embodiment of the present application further provides a battery system, which includes a battery module and a battery management system according to the embodiment of the second aspect.

[0026] The above description is merely a summary of the technical solution of the present application, which can be implemented according to the contents of the specification in order to more clearly understand the technical means of the present application, and in order to make the above and other objectives, features and advantages of the present application more apparent, specific embodiments of the present application are specifically listed below. [Brief explanation of the drawings]

[0027] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings, in which the same or similar reference numerals indicate the same or similar features and the drawings are not drawn to scale. [Figure 1] FIG. 1 shows a circuit structure diagram of a wake-up circuit provided in an embodiment of the present application. [Figure 2] FIG. 2 shows another circuit structure diagram of a wake-up circuit provided in an embodiment of the present application. [Figure 3] FIG. 3 shows a circuit structure diagram of a driving unit in a wake-up circuit provided in an embodiment of the present application. [Figure 4] FIG. 4 shows another circuit structure diagram of a wake-up circuit provided in an embodiment of the present application. [Figure 5] FIG. 5 shows a circuit structure diagram of a signal latch unit in a wake-up circuit provided in an embodiment of the present application. [Figure 6]FIG. 6 shows a circuit structure diagram of a wake-up signal generating unit in the wake-up circuit provided in the embodiment of the present application. [Figure 7] FIG. 7 shows another circuit structure diagram of a wake-up signal generating unit in a wake-up circuit provided by an embodiment of the present application. [Figure 8] FIG. 8 shows a circuit structure diagram of a wake-up identification unit in the wake-up circuit provided in the embodiment of the present application. [Figure 9] FIG. 9 shows another circuit structure diagram of the wake-up signal generating unit and the wake-up identification unit in the wake-up circuit provided by the embodiment of the present application. [Figure 10] FIG. 10 shows a schematic diagram of a capacitor discharge path in a wake-up circuit provided by an embodiment of the present application. [Figure 11] FIG. 11 shows a circuit structure diagram of a power supply unit in a wake-up circuit provided by an embodiment of the present application. [Figure 12] FIG. 12 shows a structural schematic diagram of a battery management system provided by an embodiment of the present application. [Figure 13] FIG. 13 shows a structural schematic diagram of a battery system provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0028] The features and exemplary embodiments of each aspect of the present application will be described in detail below. In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described in more detail below with reference to the drawings and specific examples. It should be understood that the specific examples described herein are only for the purpose of interpreting the present application, and do not limit the present application.

[0029] In this application, when an element is said to be "connected" or "electrically connected" to another element, it may be directly connected to the other element, or there may be one or more intermediate elements between them.

[0030] The embodiments and specific features in the embodiments provided in the examples of the present application can be combined with each other unless they are inconsistent.

[0031] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present application provide a wake-up circuit, a battery management system, and a battery system, and will be described below with reference to the accompanying drawings.

[0032] An energy storage system (ESS) is a system that stores and supplies power to an external device. It is widely used in fields such as home energy storage, industrial and commercial energy storage, and uninterruptible power supply. An energy storage system typically includes a battery module and a battery management system. The battery management system in this application is powered by a battery module. Specifically, the battery module supplies power to the BMU and BCU in a BMS. When the BMS is not operating, the BMU is in a sleep state and the BCU is in a shutdown state, thereby reducing the energy consumption of the battery module. The BMU includes a collection unit electrically connected to the battery module for monitoring data (e.g., voltage, temperature, etc.) of the battery module. The BCU is used to manage the charging and discharging of the battery module. The BCU includes a microprocessor. The microprocessor in the BCU communicates with the collection unit in the BMU to acquire data from the battery module. For example, the collection unit in the BMU is an analog front end (AFE) chip, and the microprocessor in the BCU is a microcontrol unit (MCU). As can be understood, the voltage of the battery module is usually higher than the power supply voltage (e.g., 12V) of the battery management system, and a voltage conversion circuit or power supply circuit is required to convert the voltage of the battery module to the power supply voltage of the battery management system, and the voltage conversion circuit or power supply circuit usually has a step-down function.

[0033] This application provides several embodiments for waking up a battery management system using an external power source, waking up a BMS using an external power source. Figure 1 shows a circuit structure diagram of a wake-up circuit in the embodiments of this application. As shown in Figure 1, the wake-up circuit 10 provided in the embodiments of this application includes a power supply unit 11, a wake-up signal generating unit 12, a driving unit 13, a switch M, and a power supply circuit 14.

[0034] The power supply unit 11 is connected to the wake-up signal generating unit 12, the power supply unit 11 is configured to be connected to an external power supply 30 and powers the wake-up signal generating unit 12 based on the external power supply 30, and the wake-up signal generating unit 12 is configured to be connected to the external power supply 30 and generates a wake-up signal based on the external power supply 30.

[0035] The driving unit 13 is respectively connected to the power supply unit 11 and the wake-up signal generating unit 12, and the driving unit 13 includes a switch driving circuit 131. As can be seen, the power supply unit 11 further supplies power to the driving unit 13 based on the external power supply 30. The wake-up signal generated by the wake-up signal generating unit 12 is input to the switch driving circuit 131 of the driving unit 13, and the switch driving circuit 131 outputs a control signal for turning on the switch according to the wake-up signal.

[0036] The switch M is connected to the power supply circuit 14, and the switch M is connected to the switch drive circuit 131, and the switch M is configured to perform conduction and interruption based on the output signal of the switch drive circuit 131, and the power supply circuit 14 is configured to be connected to the battery module 20 via the switch M.

[0037] In some examples in this application, the external power source 30 refers to a power source outside the battery module. For example, the external power source 30 refers to a power source from an energy storage converter (Power Conversion System, PCS). Alternatively, the external power source 30 refers to a power source from an auxiliary small battery (e.g., with an output voltage range of 9V to 16V). Alternatively, the external power source 30 refers to a power source from another device.

[0038] As can be understood, when the external power source 30 is used to wake up the BMS, the external power source 30 provides power to the wake-up circuit 10, and after the BMS is woken up, the battery module provides power to the BMS.

[0039] The switch M includes a metal-oxide-semiconductor field-effect transistor (MOSFET), although of course in other examples, the switch M may be other types of switches, such as a relay, and the present application is not limited thereto.

[0040] The switch M is connected between the battery module 20 and the power supply circuit 14. As an example, the switch M is connected between the positive terminal of the battery module 20 and the positive terminal of the power supply circuit 14.

[0041] As can be understood, when the switch M is in a conducting state, the battery module 20 and the power supply circuit 14 are conducting, the power supply circuit 14 is in an operating state, the power supply circuit 14 reduces the voltage of the battery module, generates power and supplies power to the battery management system, in this case the battery management system is in an operating state. When the switch M is in a blocking state, the electrical connection between the battery module 20 and the power supply circuit 14 is cut off, the power supply circuit 14 is in a non-operating state, in this case the power supply circuit 14 cannot supply power to the BCU, the BCU is powered down and in a shutdown state, and the BMU is in a sleep state.

[0042] As can be understood, the wake-up signal generated by the wake-up signal generating unit 12 is used to wake up the battery management system. Specifically, the wake-up signal generated by the wake-up signal generating unit 12 is used to turn on the switch M. When the switch M is turned on, the power supply circuit establishes an electrical connection with the battery module, powers the BCU, the MCU in the BCU is powered on, and the BMS is woken up.

[0043] For example, the power supply circuit 14 is located on a first circuit board, and the first circuit board serves as a power board. The power supply unit 11, the wake-up signal generating unit 12, the driving unit 13, and the switch M are located on a second circuit board, and the second circuit board serves as a control board. Of course, this is merely an example and does not limit the present application.

[0044] According to the power supply circuit provided in the embodiments of the present application, when the external power source 30 has power and is connected to the power supply unit 11, the power provided by the external power source 30 is input to the power supply unit 11, the power supply unit 11 processes the power from the external power source 30 and outputs wake-up power, which supplies power to the wake-up signal generating unit 12 and the driving unit 13, the wake-up signal generating unit 12 starts to operate and generates a wake-up signal based on the power provided by the external power source 30, the driving unit 13 starts to operate, and the switch driving circuit 131 generates a control signal for turning on the switch M based on the wake-up signal generated by the wake-up signal generating unit 12. After receiving the control signal for turning on the switch M from the switch driving circuit 131, the switch M becomes conductive, and after the switch M is turned on, the electrical connection between the battery module 20 and the power supply circuit 14 is established, the power supply circuit 14 is in an operating state, and the power supply circuit 14 can generate power to supply power to the battery management system, thereby realizing the wake-up of the battery management system.

[0045] In some embodiments, the power supply unit 11 includes a first power supply unit and a second power supply unit, the first power supply unit powers the wake-up signal generating unit 12, the second power supply unit powers the driving unit 13, the first power supply unit outputs a first voltage (e.g., 5V), and the second power supply unit outputs a second voltage (e.g., 10V).

[0046] In some embodiments, the switch driver circuit 131 not only generates a control signal for turning on the switch M based on the wake-up signal, but also can generate a control signal for turning off the switch M.

[0047] The following provides a detailed description of the implementation of the wake-up circuit of this embodiment. However, the following content is merely implementation details provided for ease of understanding and is not essential for implementing this technical solution.

[0048] Through further research, the inventors have found that when the external power source 30 has continuous power, the wake-up signal generating unit 12 always generates a wake-up signal, so the battery management system cannot power down independently, and the BMS continuously consumes power from the battery module, making it impossible to achieve low power consumption management of the energy storage system.

[0049] Based on this, in some alternative embodiments, the wake-up signal terminates after a predetermined time. That is, the wake-up signal generating unit 12 generates a wake-up signal, and then stops generating the wake-up signal after a predetermined time, which facilitates autonomous power-down of the battery management system. Specifically, after the wake-up signal terminates, the control signal output by the switch driving circuit 131 controls whether the switch M continues to conduct. When power-down is required, the control signal output by the switch driving circuit 131 causes the switch M to be turned off, thereby disconnecting the power supply circuit 14 from the battery module 20. This prevents the battery module 20 from supplying power to the battery management system, thereby enabling autonomous power-down of the battery management system.

[0050] The predetermined time can be set according to actual needs, and the present application is not limited thereto. The wake-up signal generated by the wake-up signal generating unit 12 can be used to turn on the switch M, establishing a connection between the power supply circuit 14 and the battery module 20, thereby realizing the wake-up of the battery management system. In some embodiments, the predetermined time is a relatively short time.

[0051] 2 shows another circuit structure diagram of a wake-up circuit provided in an embodiment of the present application. As shown in FIG. 2, in some embodiments, the wake-up circuit 10 provided in the embodiment of the present application further includes a wake-up identification unit 15, and the driving unit includes a switch driving circuit 131 and a microprocessor MCU electrically connected to the switch driving circuit 131. The wake-up identification unit 15 is connected to the microprocessor MCU and an external power supply 30, and is configured to generate a wake-up identification signal based on the external power supply 30 and transmit the wake-up identification signal to the microprocessor MCU. The microprocessor is also called a microcontroller unit.

[0052] After receiving the wake-up identification signal generated by the wake-up identification unit 15, the microprocessor MCU can identify the external power source 30.

[0053] Illustratively, the microprocessor MCU is connected to a power supply circuit 14. The power generated by the power supply circuit 14 supplies power to the microprocessor MCU, and after the MCU is powered on, the BMS is woken up.

[0054] The microprocessor MCU is electrically connected to the switch driving circuit 131, and the microprocessor MCU outputs a control signal to the switch driving circuit 131, and the switch driving circuit 131 controls whether the switch M maintains a conductive state or switches to a cut-off state according to the control signal from the microprocessor MCU.

[0055] In some alternative embodiments, as shown in FIG. 3, the switch driver circuit 131 includes an isolated switch driver U1, which includes a primary power supply voltage pin VDDA, a secondary power supply voltage pin VCCI1, a signal input pin INA, and a signal output pin OUTA.

[0056] The power supply unit 11 is connected to the primary power supply voltage pin VDDA and the secondary power supply voltage pin VCCI1, the signal input pin INA is connected to the wake-up signal generating unit 12, and the signal output pin OUTA is connected to the switch M. The signal input pin INA is used to input the wake-up signal generated by the wake-up signal generating unit, and the signal output pin OUTA outputs a control signal, which is used to control the on / off state of the switch M.

[0057] The power supply unit 11 generates different power supply voltages and provides them to the primary power supply voltage pin VDDA and the secondary power supply voltage pin VCCI1, respectively. For example, the primary power supply voltage pin VDDA is connected to a 10V power supply voltage, and the secondary power supply voltage pin VCCI1 is connected to a 5V power supply voltage.

[0058] The isolated switch driver U1 is a driver chip, and is in an operating state after being powered by the power supply unit 11. During the operation process, when the isolated switch driver U1 receives the wake-up signal generated by the wake-up signal generating unit, the output control signal is used to make the switch M conductive.

[0059] To improve the reliability and stability of the circuit, as an example, the switch driver circuit 131 further includes several devices such as resistors, capacitors, inductors, and diodes, and the connection relationships of each device are shown in Figure 3. It can be understood that the circuit structure around the isolated switch driver U1 shown in Figure 3 is only an example and does not limit the present application.

[0060] As explained above, the wake-up signal ends after a predetermined time, and after the wake-up signal ends, the wake-up circuit generates a self-sustaining signal, which keeps the switch M in a conducting state and maintains the wake-up state.

[0061] In some embodiments, as shown in FIG. 4, the driving unit 13 further includes a microprocessor MCU and a signal latch unit 132, where the microprocessor MCU is connected to the power supply circuit 14 and the signal latch unit 132 is connected to the microprocessor MCU and the signal input pin INA of the isolation switch driver U1, respectively.

[0062] The signal latch unit 132 holds its output state unchanged based on an input signal, which keeps its output state unchanged until another input signal arrives to change its state, and the input signal of the signal latch unit 132 is from the microprocessor MCU.

[0063] The microprocessor MCU provides a control signal to the signal latch unit 132, which outputs a self-maintaining signal under the control of the microprocessor MCU. The self-maintaining signal is transmitted to the signal input pin INA of the isolated switch driver U1, and the signal output pin OUTA of the isolated switch driver U1 outputs a control signal to control the switch M to maintain a conductive state.

[0064] When power needs to be removed, the signal latch unit 132 stops outputting the self-maintenance signal under the control of the microprocessor MCU. If the isolated switch driver U1 cannot receive the self-maintenance signal, the signal output pin OUTA of the isolated switch driver U1 outputs a control signal to control the switch M to be cut off, the electrical connection between the power supply circuit 14 and the battery module 20 is cut off, the microprocessor MCU is no longer supplied with power, and the BCU is powered down and enters a shutdown state.

[0065] In some embodiments, referring to FIGS. 3 and 4 together, the signal latch unit 132 and the wake-up signal generating unit 12 are electrically connected to a first node N1, which is electrically connected to a signal input pin INA of the isolation switch driver U1.

[0066] When the external power supply 30 has power, the power supply unit 11 supplies power to the wake-up signal generating unit 12, which then generates a wake-up signal. The wake-up signal is transmitted to the signal input pin INA of the isolated switch driver U1 via the first node N1. The isolated switch driver U1 controls the switch M to be conductive according to the received wake-up signal. After the switch M is conductive, electrical continuity is established between the power supply circuit 14 and the battery module 20. The power supply circuit 14 supplies power to the microprocessor MCU, which provides a control signal to the signal latch unit 132, causing the signal latch unit 132 to output a self-maintaining signal. The self-maintaining signal is transmitted to the signal input pin INA of the isolated switch driver U1 via the first node N1. The isolated switch driver U1 controls the switch M to be conductive according to the received self-maintaining signal. The wake-up signal generating unit 12 stops generating the wake-up signal after a predetermined time, and the signal latching unit 132 outputs a self-maintaining signal, so that the switch M remains in a conducting state.

[0067] As an example, as shown in Figure 5, the signal latch unit includes a D flip-flop U2. The clock signal terminal CLK of the D flip-flop U2 is electrically connected to the microprocessor MCU and receives a clock signal from the microprocessor MCU. The input terminal D of the D flip-flop U2 is electrically connected to the microprocessor MCU and receives a control signal from the microprocessor MCU. The output terminal Q of the D flip-flop U2 outputs a self-sustaining signal. The power supply terminal Vcc of the D flip-flop U2 is connected to a 3.3V power supply and is operated by the 3.3V power supply. The 3.3V power supply is generated after the power supply circuit 14 is operated.

[0068] To improve the stability and reliability of the circuit, the signal latch unit 132 further includes several resistors, capacitors, and other devices around the D flip-flop U2, the connections of which can be seen in Figure 5 and will not be described in detail here.

[0069] In some embodiments, as shown in FIG. 6 or FIG. 7, the wake-up signal generating unit includes a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first switch Q1, a first photocoupler U31, a sixth resistor R6, a seventh resistor R7, a second switch Q2, a third switch Q3, an eighth resistor R8, and a ninth resistor R9.

[0070] Here, a first end of the first resistor R1 and a first end of the second resistor R2 are connected to a second node N2, which is configured to be connected to an external power supply, and a second end of the first resistor R1 is connected to a first end of the first capacitor C1.

[0071] The first end of the third resistor R3 and the first end of the fourth resistor R4 are connected to a third node N3, the third node N3 is connected to the second end of the first capacitor C1, the second end of the third resistor R3 is connected to the first reference ground ISO_GND, the second end of the fourth resistor R4 is connected to the first pole of the first switch Q1, the second pole of the first switch Q1 is connected to the first reference ground ISO_GND, the second end of the second resistor R2 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected to the third pole of the first switch Q1.

[0072] The first pin of the first optocoupler U31 is connected to the second end of the second resistor R2 and the first end of the fifth resistor R5, the second pin of the first optocoupler U31 is connected to the third pole of the first switch Q1 and the second end of the fifth resistor R5, the third pin of the first optocoupler U31 is connected to the second reference ground GND via a sixth resistor R6, and the fourth pin of the first optocoupler U31 is connected to the power supply unit 11 via a seventh resistor R7. For example, the power supply unit 11 generates a 5V power supply to power the wake-up signal generating unit 12, i.e., the fourth pin of the first optocoupler U31 is connected to the 5V power supply via the seventh resistor R7.

[0073] The first pole of the second switch Q2 is connected to the third pin of the first photocoupler U31 via an eighth resistor R8, the second pole of the second switch Q2 is connected to the second reference ground GND, and the third pole of the second switch Q2 is connected to the first pole of the third switch Q3 via a ninth resistor R9, the second pole of the third switch Q3 is connected to the power supply unit 11, and the third pole of the third switch Q3 is connected to the switch driver circuit 131. The third pole of the third switch Q3 outputs a wake-up signal, which is transmitted to the switch driver circuit 131.

[0074] The following example introduces the working process of the wake-up signal generating unit.

[0075] When the external power supply 30 is connected to the wake-up signal generating circuit, the voltage on the first capacitor C1 cannot change suddenly. Therefore, the first capacitor C1 is almost short-circuited at the moment of power-on. At this time, the first resistor R1 and the third resistor R3 perform a voltage division, and a first voltage is divided across the third resistor R3. This first voltage value can turn on the first switch Q1. After the first switch Q1 conducts, the potential of the third pole of the first switch Q1 is pulled down to the first reference ground, thereby pulling down the potential of the second pin of the first optocoupler U31 to the first reference ground. At this time, the second resistor R2 and the fifth resistor R5 perform a voltage division, and a second voltage value is divided across the fifth resistor R5, driving the first optocoupler U31 to conduct. After the first photocoupler U31 is conductive, the seventh resistor R7 and the sixth resistor R6 form a voltage divider, and a third voltage is applied to the sixth resistor R6. This third voltage drives the second switch Q2 to conduct. After the second switch Q2 is conductive, the voltage at the third pole of the second switch Q2 is pulled down to the first reference ground. This pulls down the first pole of the third switch Q3 to the first reference ground. At this time, the voltage at the second pole of the third switch Q3 is greater than the voltage at the first pole, and the third switch Q3 is conductive. At this time, the third pole of the third switch Q3 outputs a wake-up signal to the switch driver, thereby realizing the wake-up signal output.

[0076] In some examples, the impedance of the first resistor R1 and the sixth resistor R6 is 100KΩ, the impedance of the second resistor R2, the fifth resistor R5, and the seventh resistor R7 is 10KΩ, and the impedance of the third resistor R3 is 510KΩ. It should be noted that the device parameters in the above examples are merely examples and are not intended to limit the present application.

[0077] In some alternative embodiments, as shown in FIG. 7, the wake-up signal generating unit further includes a tenth resistor R10, the first end of which is connected to the second end of the first resistor R1 and the first end of the first capacitor C1, and the second end of which is connected to the first reference ground ISO_GND.

[0078] The tenth resistor R10 can be used as a discharge path for the first capacitor C1.

[0079] After the first capacitor C1 is fully charged, the voltage across the third resistor R3 becomes nearly zero, at which point the first switch Q1 shuts off, followed by the first optocoupler U31 shutting off. After the first optocoupler U31 shuts off, the voltage across the sixth resistor R6 becomes zero, the second switch Q2 shuts off, and the third switch Q3 shuts off, causing the wake-up signal generating unit to stop outputting the wake-up signal, so that the wake-up signal ends after a predetermined time. As can be seen, the wake-up signal ends after a predetermined time, which is approximately the time it takes for the first capacitor C1 to fully charge. After the first capacitor C1 is fully charged, it is discharged through the tenth resistor R10.

[0080] After the wake-up signal is terminated, the battery management system uses the microprocessor MCU to output a control signal to the signal latch unit, which outputs a self-maintaining signal to the isolated switch driver, which outputs a control signal to turn on switch M according to the input self-maintaining signal, thereby maintaining the wake-up state. When it is necessary to independently power down, the microprocessor MCU stops outputting the control signal, the signal latch unit stops outputting the self-maintaining signal, and the isolated switch driver outputs a control signal to turn off switch M, thereby realizing power down of the battery management system.

[0081] Exemplarily, any one of the first switch Q1, the second switch Q2, and the third switch Q3 is a transistor or a field effect transistor (FET).

[0082] Exemplarily, referring to FIGS. 6 and 7, the first switch Q1 is an NPN transistor or an N-type FET, the second switch Q2 is an NPN transistor or an N-type FET, and the third switch Q3 is a PNP transistor or a P-type FET.

[0083] 6, when the first switch Q1 is an NPN transistor, the wake-up signal generating unit further includes a first diode D1, and the first diode D1 and a fourth resistor R4 are connected in series between the first pole of the first switch Q1 and a third node N3, where the anode of the first diode D1 is connected to the third node N3 and the cathode of the first diode D1 is connected to the first pole of the first switch Q1.

[0084] The first diode D1 has a unidirectional conduction function, which only allows current to flow from the anode to the cathode. Therefore, when the first diode D1 is provided, it can prevent the discharge current of the first capacitor C1 from flowing through the first switch Q1, thereby preventing damage to the first switch Q1.

[0085] As can be seen, since a transistor has a signal amplification function, if the switch in the wake-up signal generating unit is a transistor, the transistor can be used to amplify the wake-up signal, and thus a smaller driving current can be used to perform the wake-up.

[0086] In some alternative embodiments, as shown in FIG. 8, the wake-up identification unit includes a second photocoupler U32, an eleventh resistor R11, and a twelfth resistor R12.

[0087] The first pin of the second photocoupler U32 is configured to be connected to the external power supply 30 via an eleventh resistor R11, the second pin of the second photocoupler U32 is connected to a first reference ground ISO_GND, the third pin of the second photocoupler U32 is connected to the microprocessor, and the third pin of the second photocoupler U32 is further connected to a second reference ground GND via a twelfth resistor R12, and the fourth pin of the second photocoupler U32 is configured to be connected to a first voltage (the first voltage is, for example, 3.3V).

[0088] The third pin of the second photocoupler U32 outputs a wake-up identification signal, which can be transmitted to the microprocessor.

[0089] After the wake-up signal generating unit generates the wake-up signal, the switch M is turned on, and the power supply circuit 14 starts to operate and outputs the power supply voltage (e.g., 12V) of the BMS, which then supplies power to the battery management system. A voltage conversion circuit (e.g., a buck circuit, a regulator) on the BMS converts the power supply voltage to a first voltage (e.g., 3.3V). The input of the external power source makes the second photocoupler U32 turn on, and a wake-up identification signal is output to the microprocessor MCU. After the microprocessor MCU receives the high-level signal, it can identify the corresponding wake-up source.

[0090] The twelfth resistor R12 provides a stable pull-down level when the second optocoupler U32 is in a cut-off state, thereby preventing the microprocessor MCU from malfunctioning.

[0091] 9, the wake-up circuit further includes a second diode D2, and the wake-up identification unit and the wake-up signal generating unit are configured to be connected to the external power source 30 via the second diode D2. The second diode D2 serves as a reverse polarity protection diode for the external power source 30, preventing current from flowing into the external power source 30 and thereby protecting the external power source 30.

[0092] For example, as shown in FIG. 9, the wake-up signal generating unit further includes a thirteenth resistor R13, and the wake-up identification unit further includes a fourteenth resistor R14, a fifteenth resistor R15, a second capacitor C2, and a third capacitor C3, and the connection positions of these resistors and capacitors can refer to FIG. 9 and will not be described in detail here.

[0093] Referring to FIG. 9, the wake-up identification unit and the wake-up signal generation unit are both electrically connected to the first reference ground ISO_GND. As shown in FIG. 10, when the first capacitor C1 discharges, it includes two discharge paths, where one discharge path is that the first capacitor C1 discharges through the tenth resistor R10 and the third resistor R3, and the other discharge path is that the first capacitor C1 discharges through the first resistor R1, the eleventh resistor R11, the primary side of the second photocoupler U32, and the third resistor R3.

[0094] In some embodiments, the power supply unit 11 outputs different voltages according to different needs. As shown in Figure 11, the power supply unit 11 includes a first regulator LDO1 (Low Dropout Regulator), a first transformer unit 111, and a second transformer unit 112.

[0095] The input terminal of the first regulator LDO1 is configured to be connected to the external power supply 30, the output terminal of the first regulator LDO1 is connected to the input terminal of the first transformer unit 111, and the output terminal of the first transformer unit 111 is connected to the wake-up signal generating unit, for example, the output terminal of the first transformer unit 111 outputs 5V power to power the wake-up signal generating unit.

[0096] The input terminal of the second transformer unit 112 is connected to the output terminal of the first regulator LDO1 via the first transformer unit 111. In this case, the output power supply of the first transformer unit 111 is used as the input power supply of the second transformer unit 112.

[0097] In some other embodiments, the first transformer unit 111 includes a first transformer driver, a first transformer, and a second regulator LDO2, and the second regulator LDO2 outputs 5V power to power the wake-up signal generating unit. The input end of the second transformer unit 112 is connected to an external power supply via the second regulator LDO2, and in this case, the external power supply is stabilized by the second regulator and then used as the input power supply for the second transformer unit 112.

[0098] The output end of the second transformer unit 112 is connected to the driving unit. For example, the output end of the second transformer unit 112 outputs a 10V power supply to power the driving unit. It can be understood that if the driving unit requires an additional 5V power supply, the output end of the first transformer unit 111 is also electrically connected to the driving unit.

[0099] Here, the first transformer unit 111 includes a first transformer driving circuit 1111 and a first transformer 1112 connected to each other, and the second transformer unit 112 includes a second transformer driving circuit 1121 and a second transformer 1122 connected to each other.

[0100] The transformer driver circuit is used as a drive IC for the transformer and controls the operating state of the transformer.

[0101] The regulator, the transformer driver and the transformer may adopt the structures in the prior art, and this application will not describe them in detail.

[0102] Based on the same inventive concept, the present application also provides a battery management system. As shown in Figure 12, the battery management system 100 provided by the embodiment of the present application includes the wake-up circuit 10 described in any one of the above embodiments. The battery management system provided by the embodiment of the present application has the beneficial effects of the wake-up circuit provided by the embodiment of the present application. For details, please refer to the specific descriptions of the wake-up circuit in each of the above embodiments, and this embodiment will not be described in detail here.

[0103] Based on the same inventive concept, the present application also provides a battery system. As shown in Fig. 13, the battery system 200 provided by the embodiment of the present application includes a battery module 20 and the battery management system 100 described in any one of the above embodiments, and the battery management system 100 includes the wake-up circuit 10 described in any one of the above embodiments. The battery system provided by the embodiment of the present application has the beneficial effects of the wake-up circuit provided by the embodiment of the present application. For details, please refer to the specific descriptions of the wake-up circuit in each of the above embodiments, and this embodiment will not be described in detail here.

[0104] For example, the battery management system 100 and the battery modules 20 may be connected via a wire bundle or a bus bar. For example, they may be connected via a power wire bundle and a signal wire bundle. When the battery module 20 is charged or discharged, current flows through the power wire bundle, and the battery management system 100 collects information about the battery module 20, such as the voltage and temperature of the battery module 20 and the voltage of the battery cells in the battery module 20, via the signal wire bundle.

[0105] The battery module 20 includes a plurality of battery cells connected in parallel, series, or mixed series, and is used to store and provide power, and the battery management system 100 is used to manage the charging and discharging process of the battery module 20, thereby improving the utilization efficiency of the battery module 20 and reducing breakdowns, etc. Mixed series battery cell connection refers to battery cells connected in parallel as well as in series.

[0106] It should be noted that in the embodiments shown in the above figures, the resistor is represented as a single resistor, and the capacitor is represented as a single capacitor. In other embodiments, the resistor may be a series, parallel, or mixed resistor integration, and the capacitor may be a series, parallel, or mixed capacitor integration. The specific parameters of each device can be set according to actual needs, and the present application is not limited thereto. [Explanation of symbols]

[0107] 10, wake-up circuit; 20, battery module; 30, external power supply; 11, power supply unit; LDO1, first regulator; 111, first transformer unit; 1111, first transformer driving circuit; 1112, 1st Trans; 112, second transformer unit; 1121, second transformer drive circuit; 1122, 2nd trans; 12, wake-up signal generation unit; 13, drive unit; 131, switch drive circuit; U1, isolated switch driver; MCU, microprocessor unit; 132, signal latch unit; U2, D flip-flop; M, switch; 14, power circuit; 15, wake-up identification unit; 100, battery management system; 200, battery system.

Claims

1. A wake-up circuit, comprising: a power supply unit; a wake-up signal generating unit connected to the power supply unit; a driving unit; a switch; and a power supply circuit connected to the switch; The power supply unit is configured to be connected to an external power source and powers the wake-up signal generating unit based on the external power source; the wake-up signal generating unit is configured to be connected to the external power source and generates a wake-up signal based on the external power source; The driving units are respectively connected to the power supply unit and the wake-up signal generating unit, and include a switch driving circuit; The switch is connected to the switch drive circuit and configured to perform conduction and cut-off based on a control signal from the switch drive circuit, and the power supply circuit is configured to be connected to a battery module via the switch.

2. 2. The wake-up circuit of claim 1, wherein the wake-up signal terminates after a predetermined time.

3. the switch drive circuit includes an isolated switch driver, the isolated switch driver including a primary power supply voltage pin, a secondary power supply voltage pin, a signal input pin, and a signal output pin; 3. The wake-up circuit according to claim 1, wherein the power supply units are respectively connected to a primary power supply voltage pin and a secondary power supply voltage pin, the signal input pin is connected to the wake-up signal generating unit, and the signal output pin is connected to the switch.

4. The drive unit is a microprocessor connected to the power supply circuit; 4. The wake-up circuit of claim 3, further comprising: a signal latch unit connected to said microprocessor and said signal input pin, respectively.

5. 5. The wake-up circuit of claim 4, wherein the signal latch unit and the wake-up signal generating unit are electrically connected to a first node, and the first node is electrically connected to the signal input pin.

6. 6. The wake-up circuit according to claim 4, wherein the signal latch unit includes a D flip-flop.

7. the wake-up signal generating unit includes: a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first switch, a first photocoupler, a sixth resistor, a seventh resistor, a second switch, a third switch, an eighth resistor, and a ninth resistor; a first end of the first resistor and a first end of the second resistor are connected to a second node, the second node is configured to be connected to the external power supply, and a second end of the first resistor is connected to a first end of the first capacitor; a first end of the third resistor and a first end of the fourth resistor are connected to a third node, the third node is connected to a second end of the first capacitor, a second end of the third resistor is connected to a first reference ground, a second end of the fourth resistor is connected to a first pole of the first switch, a second pole of the first switch is connected to the first reference ground, a second end of the second resistor is connected to a first end of the fifth resistor, and a second end of the fifth resistor is connected to a third pole of the first switch; a first pin of the first photocoupler is connected to the second end of the second resistor and the first end of the fifth resistor, a second pin of the first photocoupler is connected to the third pole of the first switch and the second end of the fifth resistor, a third pin of the first photocoupler is connected to a second reference ground via the sixth resistor, and a fourth pin of the first photocoupler is connected to the power supply unit via the seventh resistor; 7. The wake-up circuit according to claim 1, wherein a first pole of the second switch is connected to a third pin of the first photocoupler via the eighth resistor, a second pole of the second switch is connected to the second reference ground, a third pole of the second switch is connected to a first pole of the third switch via the ninth resistor, a second pole of the third switch is connected to the power supply unit, and a third pole of the third switch is connected to the switch drive circuit.

8. the wake-up signal generating unit includes a tenth resistor; 8. The wake-up circuit of claim 7, wherein a first end of the tenth resistor is connected to a second end of the first resistor and a first end of the first capacitor, respectively, and a second end of the tenth resistor is connected to the first reference ground.

9. the first switch is an NPN transistor or an N-type FET, the second switch is an NPN transistor or an N-type FET, and the third switch is a PNP transistor or a P-type FET; When the first switch is an NPN transistor, the wake-up signal generating unit includes a first diode, and the first diode and the fourth resistor are connected in series between a first pole of the first switch and the third node; 9. The wake-up circuit according to claim 7, wherein the anode of the first diode is connected to the third node, and the cathode of the first diode is connected to the first pole of the first switch.

10. the wake-up circuit includes a wake-up identification unit; 10. The wake-up circuit of claim 1, wherein the wake-up identification unit is connected to a microprocessor, and the wake-up identification unit is configured to generate a wake-up identification signal based on the external power source and transmit the wake-up identification signal to the microprocessor.

11. the wake-up identification unit includes a second photocoupler, an eleventh resistor, and a twelfth resistor; 11. The wake-up circuit of claim 10, wherein a first pin of the second photocoupler is configured to be connected to the external power supply through the eleventh resistor, a second pin of the second photocoupler is connected to a first reference ground, a third pin of the second photocoupler is connected to the microprocessor, the third pin of the second photocoupler is further connected to a second reference ground through the twelfth resistor, and a fourth pin of the second photocoupler is configured to be connected to a first voltage.

12. 12. The wake-up circuit according to claim 10 or 11, wherein the wake-up circuit further includes a second diode, and the wake-up identification unit and the wake-up signal generating unit are configured to be connected to the external power supply via the second diode.

13. the power supply unit includes a first regulator, a first transformer unit, and a second transformer unit; an input terminal of the first regulator is configured to be connected to the external power supply, an output terminal of the first regulator is connected to an input terminal of the first transformer unit, and an output terminal of the first transformer unit is connected to the wake-up signal generating unit; an input end of the second transformer unit is connected to the external power supply via a second regulator, or an input end of the second transformer unit is connected to an output end of the first regulator via the first transformer unit; an output end of the second transformer unit is connected to the driving unit; 13. The wake-up circuit of claim 1, wherein the first transformer unit includes a first transformer drive circuit and a first transformer connected to each other, and the second transformer unit includes a second transformer drive circuit and a second transformer connected to each other.

14. A battery management system comprising a wake-up circuit according to any one of claims 1 to 13.

15. A battery system comprising a battery module and the battery management system according to claim 14.

Images