Battery pack wake-up device and method

Abstract

The present application relates to the field of batteries, and discloses a battery pack awakening device and method. The circuit includes an anti-reverse connection module, an overvoltage protection module, a first filter module, a first switch tube and a power supply module connected in sequence; the anti-reverse connection module is used to access the power supply voltage, and the overvoltage protection module is used to access the external voltage control signal; the power supply voltage and the external voltage control signal are filtered by the first filter module and input to different ends of the first switch tube; the first switch tube is used to turn on when the external voltage control signal is at a low level; the power supply voltage flows through the turned-on first switch tube to the power supply module, and then supplies power to the power supply module; the power supply module is used to input the working voltage to the connected battery pack to be awakened after power-on, so as to wake up the battery pack. The present application uses the battery pack awakening circuit to monitor the external voltage changes to automatically wake up the battery pack, so that the battery pack enters the power-on state from the power-off state.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery pack wake-up device and method. Background Art

[0002] The low-voltage energy storage battery pack has an independent battery management system (BMS), which has complete functions including the collection of battery cell temperature, voltage, current, data processing, and human-computer interaction. The battery pack has a separate switch to start up. When multiple machines are used in parallel or with an inverter, it needs to be activated and awakened by an external voltage. Based on this, it is necessary to design a circuit structure that wakes up the battery pack through external voltage changes. Summary of the invention

[0003] In a first aspect, the present application provides a battery pack wake-up circuit, comprising an anti-reverse connection module, an overvoltage protection module, a first filter module, a first switch tube and a power supply module connected in sequence.

[0004] The anti-reverse connection module is used to connect to the power supply voltage, and the overvoltage protection module is used to connect to the external voltage control signal; the power supply voltage and the external voltage control signal are filtered by the first filtering module and then input to the first switch tube;

[0005] The first switch tube is used to be turned on when the external voltage control signal is at a low level; the power supply voltage flows through the turned-on first switch tube to the power module, thereby supplying power to the power module; after power-on, the power module inputs a working voltage to the battery pack to be awakened to wake up the battery pack.

[0006] In an optional implementation, the overvoltage protection module includes a first voltage-dividing resistor, a second voltage-dividing resistor and a first voltage-stabilizing diode; the anti-reverse connection module includes a first diode; the first filtering module includes a first capacitor;

[0007] The first parallel end of the first voltage-dividing resistor and the first voltage-stabilizing tube is respectively connected to the first diode, the first capacitor and the first end of the first switch tube;

[0008] The second parallel end of the first voltage-dividing resistor and the first voltage-stabilizing tube is respectively connected to one end of the second voltage-dividing resistor and the first capacitor and the second end of the first switch tube;

[0009] The other end of the second voltage-dividing resistor is used to receive an external voltage control signal;

[0010] The second end of the first diode is used to access the power supply voltage.

[0011] In an optional implementation, the battery pack wake-up circuit further includes a signal control circuit;

[0012] The signal control circuit is used to input a low-level control signal to the overvoltage protection module. The low-level control signal is input to the first switch tube via the first filter module to control the first switch tube to be turned on, so that the power supply voltage supplies power to the battery module via the turned-on first switch tube; after the battery module is powered on, the operating voltage is input to the battery pack to wake up the battery pack.

[0013] The signal control circuit includes a second switch tube, a first current limiting resistor, a second filter module and a second diode;

[0014] An anode of the second diode is connected to an input end of the external voltage control signal, and a cathode of the second diode is connected to one end of the first current limiting resistor;

[0015] The other end of the first current limiting resistor is connected to one end of the second filter module and the base of the second switch tube;

[0016] The other end of the second filter module is respectively connected to the emitter of the second switch tube and the ground end;

[0017] The overvoltage protection module is connected to the ground terminal through the second switch tube.

[0018] In an optional embodiment, the battery pack wake-up circuit further includes a switch control circuit;

[0019] The switch control circuit is used to input a power supply enable signal from the battery pack to the overvoltage protection module after the battery pack is awakened, and the power supply enable signal is input to the first switch tube via the first filter module to control the first switch tube to be turned on, so that the power supply voltage supplies power to the battery module via the turned-on first switch tube; after the battery module is powered on, the working voltage is input to the battery pack to wake up the battery pack;

[0020] The switch control circuit includes a switch, a second current limiting resistor and a third diode;

[0021] The first pin of the switch is connected to the cathode of the third diode through the second current limiting resistor, and the second pin of the switch is grounded;

[0022] The anode of the third diode is respectively connected to the overvoltage protection module, the input end of the external voltage control signal and the ground end.

[0023] In a second aspect, the present application provides a battery pack wake-up device, including an activation circuit, and a battery pack wake-up circuit as described above;

[0024] When the battery pack to be awakened is in a power-off state, if it is detected that the external voltage value reaches a preset wake-up voltage value, the activation circuit is turned on, so that the activation circuit inputs an external voltage control signal of a preset level state to the battery pack wake-up circuit to turn on the first switch tube in the battery pack wake-up circuit, thereby activating the battery pack wake-up circuit, and the battery pack is awakened by inputting a working voltage to the battery pack to be awakened through the activated battery pack wake-up circuit.

[0025] In an optional implementation, the activation circuit includes an optocoupler device, a third filtering module, a voltage stabilizing module and a third current limiting resistor;

[0026] The voltage stabilizing module is used to connect to an external voltage, and the external voltage is input to the optocoupler device via the third filtering module and the third current limiting resistor, and the optocoupler device is turned on when the external voltage value reaches a preset voltage value, so that the optocoupler device in the on state outputs an external voltage control signal of a preset level state.

[0027] In an optional embodiment, the voltage stabilizing module includes a fourth diode and a second voltage stabilizing tube; the third filtering module includes an RC circuit and a second capacitor;

[0028] The anode of the fourth diode is used to connect to the external voltage, and the cathode of the fourth diode is connected to the negative electrode of the second voltage regulator tube;

[0029] The positive electrode of the second voltage regulator is connected to one end of the RC circuit and the third current limiting resistor respectively; the other end of the RC circuit is grounded;

[0030] The other end of the third current limiting resistor is connected to the second capacitor and the first end of the optocoupler device respectively; the second capacitor and the second end of the optocoupler device are connected to the ground end;

[0031] The third terminal of the optocoupler device is connected to the ground terminal, and the fourth terminal of the optocoupler device is used to output an external voltage control signal.

[0032] In an optional embodiment, a delay circuit is further included, wherein the delay circuit is used to access the external voltage, charge the charging capacitor with a constant current through the external voltage, and input a low-level signal to the first end of the optocoupler in the activation circuit after the charging time reaches a preset time, so that the optocoupler is in a cut-off state and outputs a high-level external voltage control signal;

[0033] Wherein, if the battery pack wake-up circuit includes a signal control circuit;

[0034] The signal control circuit is used to input a power supply enable signal from the battery pack to the overvoltage protection module, and the power supply enable signal is input to the first switch tube via the first filter module to control the first switch tube to be turned on, so that the power supply voltage supplies power to the battery module via the turned-on first switch tube, so that the battery module continues to supply power to the battery pack;

[0035] The signal control circuit is used to input a power-off control signal from the battery pack to the overvoltage protection module, and the power-off control signal is used to control the first switch tube to disconnect, so that the battery module is in a power-off state. The battery pack enters the power-off state after failing to receive the power supply voltage from the battery module.

[0036] In an optional implementation, the delay circuit includes a constant current module, a charging circuit including the charging capacitor, a voltage divider module, a third voltage regulator tube, a fourth current limiting resistor, a pull-down resistor and a third switch tube;

[0037] The input end of the constant current module is used to access the external voltage, and the output end of the constant current module is connected to the charging circuit and the voltage dividing module respectively;

[0038] The first parallel end of the pull-down resistor and the third voltage regulator tube is connected to the gate of the third switch tube, and the second parallel end of the pull-down resistor and the third voltage regulator tube is connected to the source of the third switch tube and the ground terminal;

[0039] The middle node of the voltage dividing module is connected to one end of the fourth current limiting resistor; the other end of the fourth current limiting resistor is connected to the gate of the third switch tube;

[0040] The drains of the third switch tubes are respectively connected to the activation circuits.

[0041] In a third aspect, the present application provides a battery pack wake-up method, which is applied to the battery pack wake-up device as described above, comprising:

[0042] When the battery pack to be awakened is in a power-off state, if it is detected that the external voltage value reaches a preset awakening voltage value, the activation circuit in the battery pack awakening device is turned on, so that the activation circuit inputs an external voltage control signal of a preset level state to the battery pack awakening circuit in the battery pack awakening device;

[0043] The battery pack wake-up circuit turns on the internal first switch tube after receiving the external voltage control signal of the preset level state, and then inputs the power supply voltage received by the battery pack wake-up circuit to the internal power supply module via the turned-on first switch tube, so that the power supply module inputs the working voltage to the battery pack to be awakened after power-on, so as to wake up the battery pack.

[0044] The embodiments of the present application have the following beneficial effects:

[0045] The embodiment of the present application provides a battery pack wake-up circuit, which includes an anti-reverse connection module, an overvoltage protection module, a first filter module, a first switch tube and a power module connected in sequence; the anti-reverse connection module is used to access the power supply voltage, and the overvoltage protection module is used to access the external voltage control signal; the power supply voltage and the external voltage control signal are filtered by the first filter module and input to different ends of the first switch tube; the first switch tube is used to be turned on when the external voltage control signal is at a low level; the power supply voltage flows through the turned-on first switch tube to the power module, and then supplies power to the power module; the power module is used to input the working voltage to the connected battery pack to be awakened after power-on, so as to wake up the battery pack. The embodiment of the present application uses the battery pack wake-up circuit to monitor the external voltage changes to automatically wake up the battery pack, so that the battery pack enters the power-on state from the power-off state. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope of protection of the present application. In each of the drawings, similar components are numbered similarly.

[0047] Figure 1 A first structural schematic diagram of a battery pack wake-up circuit in an embodiment of the present application is shown;

[0048] Figure 2 A second structural schematic diagram of the battery pack wake-up circuit in an embodiment of the present application is shown;

[0049] Figure 3 A first structural schematic diagram of an activation circuit in an embodiment of the present application is shown;

[0050] Figure 4 A schematic diagram of the structure of a delay circuit in an embodiment of the present application is shown;

[0051] Figure 5 A second structural schematic diagram of the activation circuit in an embodiment of the present application is shown;

[0052] Figure 6 A flow chart of a battery pack wake-up method in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0054] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0055] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present application, are intended only to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing items or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing items.

[0056] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0057] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present application.

[0058] Please refer to Figure 1 An embodiment of the present application provides a battery pack wake-up circuit 100, through which the battery pack wake-up circuit monitors external voltage changes to automatically wake up the battery pack, so that the battery pack enters a power-on state from a power-off state (POWER OFF state).

[0059] For example, Figure 1 As shown, the battery pack wake-up circuit 100 includes an anti-reverse connection module 110, an overvoltage protection module 120, a first filter module 130, a first switch tube Q1 and a power module 140 which are connected in sequence.

[0060] The anti-reverse connection module 110 is used to connect to the power supply voltage, that is, the anti-reverse connection module 110 is connected to the positive terminal of the power supply (that is, B+); the overvoltage protection module 120 is used to connect to the external voltage control signal (that is, P+_VCC_CON); the power supply voltage and the external voltage control signal are filtered by the first filter module 130 and input to the first switch tube Q1. The first switch tube Q1 is used to be turned on when the external voltage control signal is at a low level. The power supply voltage flows through the turned-on first switch tube Q1 to the power module 140, thereby supplying power to the power module 140; after power-on, the power module 140 inputs the working voltage to the battery pack to be awakened to wake up the battery pack.

[0061] Furthermore, the overvoltage protection module 120 includes a first voltage-dividing resistor R1, a second voltage-dividing resistor R2 and a first voltage-stabilizing tube ZD1; the reverse connection prevention module 110 includes a first diode D1; and the first filtering module 130 includes a first capacitor C1.

[0062] Among them, the first parallel ends of the first voltage-dividing resistor R1 and the first voltage-stabilizing tube ZD1 are respectively connected to the first diode D1, the first capacitor C1 and the first end of the first switch tube Q1; the second parallel ends of the first voltage-dividing resistor R1 and the first voltage-stabilizing tube ZD1 are respectively connected to one end of the second voltage-dividing resistor R2 and the second ends of the first capacitor C1 and the first switch tube Q1; the other end of the second voltage-dividing resistor R2 is used to receive an external voltage control signal; the second end of the first diode D1 is used to access the power supply voltage.

[0063] It can be understood that in the above-mentioned battery pack wake-up circuit 100, the power supply voltage flows into the first switch tube Q1 through the anti-reverse connection module 110, the overvoltage protection module 120 and the first filter module 130; the first switch tube Q1 can be regarded as the power supply switch of the power module 140. When the first light switch is turned on, the power supply voltage flows into the power module 140 through the first switch tube Q1, so that the power module 140 is powered on, and the battery pack wake-up circuit 100 is activated; and after the power module 140 is powered on, the required working voltage (i.e., VCC) is input to the battery pack to be awakened inside the battery management system (i.e., BMS) to wake up the battery pack and realize the activation and awakening of the battery pack. Furthermore, the activation condition of the battery pack wake-up circuit 100 is that the first switch tube Q1 is turned on so that the power module 140 is powered on, and the battery pack to be awakened is awakened by inputting the working voltage to it through the activated battery pack wake-up circuit 100.

[0064] Furthermore, the condition for the first switch tube Q1 to be turned on is that the external voltage control signal input externally is pulled low, that is, when the external voltage control signal is in a low-level state, the low-voltage external voltage control signal is input to the gate of the first switch tube Q1, and at this time, the source of the first switch tube Q1 inputs the power supply voltage, thereby causing a potential difference between the gate and the source of the first switch tube Q1, thereby turning on the first switch tube Q1.

[0065] In one embodiment, if Figure 2 As shown, the battery pack wake-up circuit 100 also includes a signal control circuit 150. The signal control circuit 150 is used to input a power supply enable signal (i.e., MCU_POWER_EN) from the battery pack to the overvoltage protection module after the battery pack is awakened. The power supply enable signal is input to the first switch tube Q1 via the first filter module 130 to control the first switch tube Q1 to be turned on, so that the power supply voltage supplies power to the battery module via the turned-on first switch tube Q1; after the battery module is powered on, the working voltage is input to the battery pack to wake up the battery pack.

[0066] Exemplarily, the signal control circuit 150 includes a second switch tube Q2, a first current limiting resistor R3, a second filter module 151 and a third diode D3; the anode of the third diode D3 is connected to the input end of the external voltage control signal, and is used to access the external voltage control signal; the cathode of the third diode D3 is connected to one end of the first current limiting resistor R3; the other end of the first current limiting resistor R3 is connected to one end of the second filter module 151 and the base of the second switch tube Q2; the other end of the second filter module 151 is respectively connected to the emitter and the ground end of the second switch tube Q2; the overvoltage protection module 120 is connected to the ground end through the second switch tube Q2.

[0067] The second filtering module 151 includes a capacitor C34 and a voltage-dividing resistor R7. The first parallel ends of the capacitor C3 and the voltage-dividing resistor R7 are respectively connected to the base of the second switch tube Q2 and the first current-limiting resistor R3; the second parallel ends of the capacitor C3 and the voltage-dividing resistor R7 are respectively connected to the emitter of the second switch tube Q2 and the ground terminal.

[0068] It can be understood that based on the above structure, after the battery pack is awakened and powered on, the signal control circuit 150 can input a power enable signal to the battery pack awakening circuit 100 and pull the power enable signal high and lock it, so that the battery pack awakening circuit 100 continues to supply power to the battery pack, and the battery pack will always be in working condition.

[0069] It should be noted that after receiving a low-level external voltage control signal, the battery pack wake-up circuit 100 can be activated so that the battery pack wake-up circuit 100 supplies power to the battery pack to be awakened, thereby waking up the battery pack. After the battery pack is awakened, the internal controller can send a power enable signal to the battery pack wake-up circuit 100. After receiving the power enable signal, the battery pack wake-up circuit 100 turns on the first switch tube Q1, so that the power supply voltage flows into the power module 140, and the power module 140 supplies power to the battery pack, so that the battery pack can always be in working condition.

[0070] It should be noted that before the awakened battery pack inputs the power enable signal to the battery pack awakening circuit 100, it first turns on the self-test mode to confirm that there is no abnormality in its own operation, and then controls whether to output the power enable signal according to the demand to keep itself in a continuous working state. If the self-test result is abnormal, the power enable signal is not output.

[0071] In one embodiment, the battery pack wake-up circuit 100 also includes a switch control circuit 160; the switch control circuit 160 is used to input a switch control signal of a preset level state to the overvoltage protection module, and the switch control signal is input to the first switch tube Q1 via the first filter module 130. The first switch tube Q1 is turned on when the control signal is in a low level state, so that the power supply voltage supplies power to the battery module via the turned-on first switch tube Q1; after the battery module is powered on, the operating voltage is input to the battery pack to wake up the battery pack.

[0072] Exemplarily, the switch control circuit 160 includes a switch J1, a second current limiting resistor R4 and a second diode D2; the first pin of the switch J1 is connected to the cathode of the second diode D2 through the second current limiting resistor R4, and the second pin of the switch J1 is grounded; the anode of the second diode D2 is respectively connected to the overvoltage protection module 120, the input end of the external voltage control signal and the ground end.

[0073] It can be understood that the present embodiment can also activate the battery pack wake-up circuit 100 by controlling the switch J1 to be turned on, thereby activating the battery pack. The implementation principle of this process is the same as the implementation principle of activating the battery pack wake-up circuit 100 by the above-mentioned low-level external voltage control signal, so this embodiment will not be repeated here.

[0074] In one embodiment, the signal control circuit 150 is also used to input a power-off control signal from the battery pack to the overvoltage protection module. The power-off control signal is used to control the first switch tube Q1 to be disconnected, so that the battery module is in a power-off state. The battery pack enters the power-off state after failing to receive the power supply voltage from the battery module.

[0075] That is, the present embodiment can also realize power-off of the battery pack through the switch control circuit 160, that is, a power-off control signal is sent through the switch control circuit 160, so that the first switch tube Q1 is disconnected, and the power module 140 cannot be powered on, and thus cannot provide working voltage for the battery pack, and the battery pack loses power and is in a power-off state; wherein, the circuit structure and implementation logic for realizing power-off of the battery pack through the switch control circuit 160 can be adjusted accordingly according to actual needs, and the present embodiment does not limit this.

[0076] It should be noted that the battery pack wake-up circuit 100 can be activated when receiving any one of a low-level external voltage control signal, a low-voltage switch control signal, and a power supply enable signal, so that the power supply voltage flows into the power module 140 through the turned-on first switch tube Q1. The power module 140 supplies power to the battery pack after power-on, so that the battery pack changes from a power-off state to a working state. In addition, the processes of activating the battery pack wake-up circuit 100 by the switch control signal, the power supply enable signal, and the external voltage control signal do not conflict with each other.

[0077] In this embodiment, the above-mentioned battery pack wake-up circuit 100 is used to automatically wake up the battery pack in a power-off state under the influence of external voltage, switch control and power enable control of the battery pack, so that the battery pack can be in a continuously working state without manual startup, thereby improving operation and maintenance efficiency.

[0078] Correspondingly, if Figure 3 As shown, an embodiment of the present application also provides a battery pack wake-up device, which includes an activation circuit 200 and the aforementioned battery pack wake-up circuit 100; wherein, when the battery pack to be awakened is in a power-off state, if it is detected that the external voltage value reaches a preset wake-up voltage value, the activation circuit 200 is turned on, and an external voltage control signal of a preset level state is input to the battery pack wake-up circuit 100; the battery pack wake-up circuit 100 is used to turn on the internal first switch tube Q1 after receiving a low-level external voltage control signal, and then input the power supply voltage received by the battery pack wake-up circuit 100 to the internal power module 140 via the turned-on first switch tube Q1, so that the power module 140 inputs the working voltage to the battery pack to be awakened after power-on, so as to wake up the battery pack.

[0079] It can be understood that the activation circuit 200 is used to monitor the changes in the external voltage, and then is activated when the voltage value of the external voltage reaches the preset wake-up voltage value, so as to input the external voltage control signal to the battery pack wake-up circuit 100, so that the battery pack wake-up circuit 100 can activate its own circuit and wake up the connected battery pack based on the external voltage control signal. That is, the activation circuit 200 is used to monitor the changes in the external voltage, and then trigger the battery pack wake-up circuit 100 to work and wake up the battery pack based on the changes in the external voltage.

[0080] Furthermore, if Figure 3As shown, the activation circuit 200 includes an optocoupler device 210, a third filter module 220, a voltage stabilizing module 230 and a third current limiting resistor R5; wherein, the voltage stabilizing module 230 is used to access an external voltage, and the external voltage is input to the optocoupler device 210 via the third filter module 220 and the third current limiting resistor R5, and the optocoupler device 210 is turned on when the external voltage value reaches a preset voltage value, so that the optocoupler device 210 in the on state outputs an external voltage control signal of a preset level state.

[0081] Exemplarily, the voltage stabilizing module 230 includes a fourth diode D4 and a second voltage stabilizing tube ZD2; the third filtering module 220 includes an RC circuit and a second capacitor C2; the anode of the fourth diode D4 is used to access an external voltage, and the cathode of the fourth diode D4 is connected to the negative electrode of the second voltage stabilizing tube ZD2; the positive electrode of the second voltage stabilizing tube ZD2 is respectively connected to the RC circuit and one end of the third current limiting resistor R5; the other end of the RC circuit is grounded; the other end of the third current limiting resistor R5 is respectively connected to the second capacitor C2 and the first end of the optocoupler 210; the second capacitor C2 and the second end of the optocoupler 210 are connected to the ground end; the fourth end of the optocoupler 210 is used to output an external voltage control signal, and the third end of the optocoupler 210 is connected to the ground end. Wherein, the RC circuit includes a resistor R8 and a capacitor C4 connected in parallel.

[0082] In this embodiment, the fourth diode D4 conducts a voltage drop V D1 , Zener diode (ZD2) reverse voltage drop V ZD2 , the voltage drop of the light-emitting diode in the optocoupler device 210 (N1) V N1 To set the activation voltage V1 (where V1 ≥ V D1 + V ZD2 + V N1 ).

[0083] Furthermore, when the battery pack is in a power-off state and the value of the external voltage (i.e., P+ voltage) reaches V1, i.e., V1 ≥ V D1 + V ZD2 + V N1 When the battery pack wake-up circuit 100 is turned on, the circuit of the battery pack wake-up circuit 100 is turned on, so that the external voltage control signal is pulled low; wherein, the voltage regulator tube and the fourth diode D4 are connected in series to play the role of current limiting and voltage stabilization.

[0084] In some examples, such as Figure 4 and Figure 5As shown, the activation circuit 200 also includes a delay circuit 240, which is used to access an external voltage, charge the charging capacitor with a constant current through the external voltage, and input a low-level signal to the first end of the optocoupler device 210 in the activation circuit 200 after the charging time reaches a preset time, so that the optocoupler device 210 is in a cut-off state and outputs a high-level external voltage control signal.

[0085] Among them, the delay circuit 240 includes a constant current module 241, a charging circuit 242 including a charging capacitor, a voltage divider module 243, a third voltage regulator ZD3, a fourth current limiting resistor R6, a pull-down resistor R12 and a third switch tube Q3; the input end of the constant current module 241 is used to access an external voltage, and the output end of the constant current module 241 is respectively connected to the charging circuit 242 and the voltage divider module 243; the first parallel end of the pull-down resistor and the third voltage regulator ZD3 is connected to the gate of the third switch tube Q3, and the second parallel end of the pull-down resistor and the third voltage regulator ZD3 is connected to the source and ground of the third switch tube Q3; the middle node of the voltage divider module 243 is connected to one end of the fourth current limiting resistor R6; the other end of the fourth current limiting resistor R6 is connected to the gate of the third switch tube Q3; the drain of the third switch tube Q3 is respectively connected to the activation circuit 200.

[0086] Furthermore, the constant current module 241 includes resistors R9, R10, switch tubes Q4 and Q5; the charging circuit 242 includes a charging capacitor C5, a diode D5 and a pull-down resistor R11; wherein the charging capacitor is used to set the delay duration; the voltage divider module 243 includes a voltage divider resistor R12 and a voltage divider resistor R13 connected in series.

[0087] In this embodiment, the delay time T1 is set by adjusting the constant current source (R9, R10, Q4, Q5), the voltage dividing resistor (R12, R13) and the capacitor (C5); when the external voltage is monitored, the constant current source in the delay circuit 240 charges the charging capacitor with the current I1, and the capacitor voltage is divided by the voltage dividing module 243 after the charging time T1, so that when the Vgs (GS voltage) of the switch tube Q3 is greater than the turn-on voltage Vth of the switch tube Q3, the switch tube Q3 is turned on, and the voltage of the pin 1 of the optocoupler device 210 is pulled down, so that the optocoupler device 210 is turned off, and the P+_VCC_CON signal is released (pulled up again from the low level), and then, the battery pack wake-up device will not continue to have an external voltage P+, ​​so that the P+_VCC_CON signal is not continuously pulled down, so that the battery pack cannot enter the power-off state.

[0088] It can be understood that after the P+_VCC_CON signal is pulled low and the battery pack is awakened, the power supply process of the battery pack is switched to controlling the battery pack wake-up circuit 100 to continue to supply power to the battery pack by pulling the output power enable signal high. After a delay of T1, the P+_VCC_CON signal is released (pulled high again). Then, when the battery pack fails or a power-off instruction needs to enter a power-off state, the power enable signal can be pulled low to disconnect the power supply of the power module 140 and enter the power-off state; if the P+_VCC_CON signal is not released (continuously pulled low), the power supply input of the battery pack by the power module 140 cannot be disconnected, causing the battery pack to be unable to enter the power-off state.

[0089] That is, the external voltage control signal is released with a delay by the delay circuit 240, so that if the battery pack needs to enter the power-off state later, after the external voltage control signal is released, the power supply enable signal outputted from the battery pack can be pulled down to disconnect the circuit of the power module 140 in the battery pack wake-up circuit 100 supplying power to the battery pack, thereby causing the battery pack to be powered off to enter the power-off state. Furthermore, this embodiment releases the external voltage control signal by the delay circuit 240 to prevent the battery pack from being unable to enter the power-off state due to the continuous external voltage, thereby reducing the power consumption of the battery pack.

[0090] Correspondingly, the embodiment of the present application further provides a battery pack awakening method, which can rely on the aforementioned battery pack awakening device, specifically, as follows: Figure 6 As shown, the method comprises the following steps:

[0091] S310, when the battery pack to be awakened is in a power-off state, if it is detected that the external voltage value reaches a preset wake-up voltage value, the activation circuit 200 in the battery pack awakening device is turned on, so that the activation circuit 200 inputs an external voltage control signal of a preset level state to the battery pack awakening circuit 100 in the battery pack awakening device.

[0092] S320, after receiving the external voltage control signal of the preset level state, the battery pack wake-up circuit 100 turns on the internal first switch tube Q1 to activate the battery pack wake-up circuit 100, and wakes up the battery pack by inputting the working voltage to the battery pack to be awakened through the activated battery pack wake-up circuit 100.

[0093] It can be understood that the aforementioned battery pack awakening device is used to execute all steps of the battery pack awakening method in this embodiment. Therefore, any optional options of the battery pack awakening device in the above embodiment are also applicable to this embodiment, so they will not be repeated here.

[0094] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A battery pack wake-up device, characterized in that: Including activation circuit and battery pack wake-up circuit; The activation circuit is used to turn on the activation circuit and input an external voltage control signal of a preset level state to the battery pack wake-up circuit when the battery pack to be awakened is in a power-off state if it is detected that the external voltage value reaches the preset wake-up voltage value; The battery pack wake-up circuit includes a first switch tube and a power module. The battery pack wake-up circuit is used to turn on the first switch tube after receiving a low-level external voltage control signal, and then input the power supply voltage received by the battery pack wake-up circuit to the power module via the turned-on first switch tube, so that the power module inputs the working voltage to the battery pack to be awakened after power-on, so as to wake up the battery pack; Wherein, the activation circuit includes an optocoupler device, a third filtering module, a voltage stabilizing module and a third current limiting resistor; The voltage stabilizing module is used to connect to an external voltage, and the external voltage is input to the optocoupler via the third filtering module and the third current limiting resistor, and the optocoupler is turned on when the external voltage value reaches a preset voltage value, so that the optocoupler in the on state outputs an external voltage control signal of a preset level state; The voltage stabilizing module includes a fourth diode and a second voltage stabilizing tube; the third filtering module includes an RC circuit and a second capacitor; the anode of the fourth diode is used to access the external voltage, and the cathode of the fourth diode is connected to the negative electrode of the second voltage stabilizing tube; the positive electrode of the second voltage stabilizing tube is respectively connected to the RC circuit and one end of the third current limiting resistor; the other end of the RC circuit is grounded; the other end of the third current limiting resistor is respectively connected to the second capacitor and the first end of the optocoupler; the second ends of the second capacitor and the optocoupler are connected to the ground end; the third end of the optocoupler is connected to the ground end, and the fourth end of the optocoupler is used to output the external voltage control signal.

2. A battery pack wake-up device according to claim 1, characterized in that: It also includes a delay circuit, which is used to access the external voltage, charge the charging capacitor with a constant current through the external voltage, and input a low-level signal to the first end of the optocoupler in the activation circuit after the charging time reaches a preset time, so that the optocoupler is in a cut-off state and outputs a high-level external voltage control signal.

3. The battery pack wake-up device according to claim 2, characterized in that: The delay circuit includes a constant current module, a charging circuit including the charging capacitor, a voltage dividing module, a third voltage regulator tube, a fourth current limiting resistor, a pull-down resistor and a third switch tube; The input end of the constant current module is used to access the external voltage, and the output end of the constant current module is connected to the charging circuit and the voltage dividing module respectively; The first parallel end of the pull-down resistor and the third voltage regulator tube is connected to the gate of the third switch tube, and the second parallel end of the pull-down resistor and the third voltage regulator tube is connected to the source of the third switch tube and the ground terminal; The middle node of the voltage dividing module is connected to one end of the fourth current limiting resistor; the other end of the fourth current limiting resistor is connected to the gate of the third switch tube; The drains of the third switch tubes are respectively connected to the activation circuits.

4. The battery pack wake-up device according to claim 1, characterized in that: The battery pack wake-up circuit further includes an anti-reverse connection module, an overvoltage protection module and a first filter module; wherein the anti-reverse connection module, the overvoltage protection module, the first filter module, the first switch tube and the power supply module are connected in sequence; The anti-reverse connection module is used to connect to the power supply voltage, and the overvoltage protection module is used to connect to the external voltage control signal; the power supply voltage and the external voltage control signal are filtered by the first filtering module and then input to different ends of the first switch tube; The first switch tube is used to be turned on when the external voltage control signal is at a low level; the power supply voltage flows through the turned-on first switch tube to the power module, thereby supplying power to the power module; the power module is used to input a working voltage to the connected battery pack to be awakened after power-on, so as to wake up the battery pack.

5. The battery pack wake-up device according to claim 4, characterized in that: The overvoltage protection module includes a first voltage-dividing resistor, a second voltage-dividing resistor and a first voltage-stabilizing diode; the anti-reverse connection module includes a first diode; the first filtering module includes a first capacitor; The first parallel end of the first voltage-dividing resistor and the first voltage-stabilizing tube is respectively connected to the first diode, the first capacitor and the first end of the first switch tube; The second parallel end of the first voltage-dividing resistor and the first voltage-stabilizing tube is respectively connected to one end of the second voltage-dividing resistor and the first capacitor and the second end of the first switch tube; The other end of the second voltage-dividing resistor is used to receive the external voltage control signal; The second end of the first diode is used to access the power supply voltage.

6. The battery pack awakening device according to claim 4, characterized in that: The battery pack wake-up circuit also includes a switch control circuit; The switch control circuit is used to input a switch control signal of a preset level state to the overvoltage protection module, and the switch control signal is input to the first switch tube via the first filter module. The first switch tube is used to be turned on when the control signal is in a low level state, so that the power supply voltage supplies power to the battery module via the turned-on first switch tube; after the battery module is powered on, the working voltage is input to the battery pack to wake up the battery pack; Wherein, the switch control circuit includes a switch, a second current limiting resistor and a second diode; The first pin of the switch is connected to the cathode of the second diode through the second current limiting resistor, and the second pin of the switch is grounded; The anode of the second diode is respectively connected to the overvoltage protection module, the input end of the external voltage control signal and the ground end.

7. The battery pack awakening device according to claim 4, characterized in that: The battery pack wake-up circuit also includes a signal control circuit; The signal control circuit is used to input a power supply enable signal from the battery pack to the overvoltage protection module after the battery pack is awakened, and the power supply enable signal is input to the first switch tube via the first filter module to control the first switch tube to be turned on, so that the power supply voltage supplies power to the battery module via the turned-on first switch tube; after the battery module is powered on, the working voltage is input to the battery pack to wake up the battery pack; The signal control circuit is further used to input a power-off control signal from the battery pack to the overvoltage protection module, and the power-off control signal is used to control the first switch tube to be disconnected, so that the battery module is in a power-off state, and the battery pack enters the power-off state after failing to receive the power supply voltage of the battery module; Wherein, the signal control circuit includes a second switch tube, a first current limiting resistor, a second filter module and a third diode; An anode of the third diode is connected to an input end of the external voltage control signal, and a cathode of the third diode is connected to one end of the first current limiting resistor; The other end of the first current limiting resistor is connected to one end of the second filter module and the base of the second switch tube; The other end of the second filter module is respectively connected to the emitter of the second switch tube and the ground end; The overvoltage protection module is connected to the ground terminal through the second switch tube.

8. A battery pack wake-up method, characterized in that: A battery pack wake-up device as claimed in any one of claims 1 to 7, comprising: When the battery pack to be awakened is in a power-off state, if it is detected that the external voltage value reaches a preset awakening voltage value, the activation circuit in the battery pack awakening device is turned on, so that the activation circuit inputs an external voltage control signal of a preset level state to the battery pack awakening circuit in the battery pack awakening device; The battery pack wake-up circuit turns on the internal first switch tube after receiving a low-level external voltage control signal, and then inputs the power supply voltage received by the battery pack wake-up circuit to the internal power module via the turned-on first switch tube, so that the power module inputs the working voltage to the battery pack to be awakened after power-on, so as to wake up the battery pack.

Images