A wake-up circuit and an energy storage device

Abstract

The application discloses a kind of wake-up circuit and energy storage device, the application provides a kind of wake-up circuit, for battery management system, battery management system includes main battery and secondary battery, main battery is used to send signal to communication bus when needing to wake up secondary battery, wake-up circuit includes: switching module, connect secondary battery with voltage source, for when conducting to wake up secondary battery with the power supply voltage output by voltage source output to secondary battery;Control module is connected with communication bus and the controlled end of switching module respectively, for after the signal of communication bus exceeds preset intensity threshold, to the controlled end of switching module sends control signal, to control switching module conduction.The technical scheme of the application can reduce the false wake-up probability caused by non-target signal, such as bus broadcast, heartbeat or noise disturbance irrelevant to secondary battery, reduce unnecessary static consumption of secondary battery, improve the standby efficiency and anti-interference ability of system.

Description

Technical Field

[0001] This application relates to the field of energy storage equipment technology, and in particular to a wake-up circuit and energy storage device. Background Technology

[0002] As the capacity of energy storage devices increases, a single electrical device typically includes multiple battery modules, which are divided into main batteries and auxiliary batteries according to their functions: the main battery undertakes basic functions such as system power-on, bus management, and long-term standby, and needs to be continuously powered on to maintain the operation of the bus clock, core controller, and safety monitoring; the auxiliary battery serves as an extended energy unit that is put into use on demand. It is usually in hibernation to reduce standby power consumption, and is only awakened to participate in power supply and communication when the load increases, the range is extended, or redundancy is taken over.

[0003] Existing wake-up logic is mostly based on the activity signal of the communication bus or relies on a dedicated CAN transceiver with wake-up function: when a physical layer level change is detected on the bus, the transceiver or interface circuit outputs a wake-up signal to the microcontroller, causing the dormant battery to enter the working state. This reduces the unnecessary static power consumption of the auxiliary battery while ensuring the immediate availability of the system.

[0004] However, the above logic can easily lead to problems when multiple secondary batteries are connected in parallel and share a single communication bus: whenever communication occurs on the communication bus, whether it is when there is a wake-up request or when there is a broadcast, heartbeat from other nodes, or noise disturbance unrelated to the secondary battery, the secondary battery will be repeatedly and falsely woken up, causing unnecessary energy consumption. In severe cases, the secondary battery may be depleted before it is actually used. At the same time, relying on a specific wake-up chip is costly and has poor process applicability, which is not conducive to its widespread deployment in the power management system. Utility Model Content

[0005] One objective of this application is to provide a wake-up circuit and energy storage device, which aims to solve the technical problem in the prior art where the auxiliary battery pack in standby mode is accidentally woken up due to signal disturbances on the communication bus.

[0006] To achieve the above objectives, in a first aspect, this application provides a wake-up circuit for a battery management system. The battery management system includes a main battery and a secondary battery. The main battery sends a signal to a communication bus when the secondary battery needs to be woken up. The wake-up circuit includes: a switch module connected to the secondary battery and a voltage source, used to output the supply voltage from the voltage source to the secondary battery to wake it up when it is turned on; and a control module connected to the controlled terminals of the communication bus and the switch module, used to send a control signal to the controlled terminals of the switch module after the signal on the communication bus exceeds a preset strength threshold, so as to control the switch module to turn on.

[0007] This application discloses a wake-up circuit for receiving signals from a communication bus and controlling the wake-up of a secondary battery accordingly. When the wake-up circuit is operational, a control module continuously or periodically acquires signal strength characteristics of the communication bus, such as voltage or current, to quantify the signal. This signal is then compared to a preset strength threshold. When the communication bus signal exceeds the threshold, the control module outputs a control signal to a switching module. Upon receiving this control signal, the switching module switches to the ON state, outputting a power supply voltage to the secondary battery and performing a wake-up action, causing the secondary battery to transition from dormancy to operation, thus participating in power supply or communication. This achieves the effect of the secondary battery only being woken up when the communication bus signal strength meets the threshold, avoiding the technical problem of the secondary battery being falsely woken up due to noise interference from the communication bus.

[0008] Compared to existing technologies that indiscriminately wake up secondary batteries based on communication bus activities, this application only sends a control signal from the control module to the switching module after the signal strength threshold of the communication bus is met. The wake-up of the secondary battery has a threshold; it will not start if the threshold is not reached, and will only be triggered when the threshold is reached. Compared to existing technologies, this application's solution can reduce the probability of false wake-ups caused by non-target signals such as bus broadcasts, heartbeats, or noise disturbances unrelated to the secondary battery, and reduce unnecessary static consumption of the secondary battery. Simultaneously, the wake-up action is controlled by the control module and the switching module rather than directly following communication bus activities, making the timing of each secondary battery's activation more controllable. This is beneficial for grouping or sequentially activating multiple sets of secondary batteries in parallel scenarios, achieving selectivity and stability in secondary battery wake-up, and improving system standby efficiency and anti-interference capabilities.

[0009] In conjunction with the first aspect, according to one embodiment of this application, the wake-up circuit further includes: a delay driving module connected between the control module and the controlled terminal of the switch module, for receiving a control signal and outputting a corresponding driving signal to the controlled terminal of the switch module after a preset duration, so as to control the switch module to turn on.

[0010] Based on the control module, this embodiment sets up a delay drive module between the controlled end of the control module and the controlled end of the switch module. This ensures that the delay drive module only outputs a drive signal to the controlled end of the switch module to turn it on when the duration of the control signal output by the control module is not less than a preset duration. Thus, in addition to the original intensity determination based on the preset intensity threshold, a duration determination is introduced, creating a dual threshold of intensity and time for the communication bus signal.

[0011] The above design effectively filters transient interference on the communication bus: for high-intensity transient pulses caused by noise, glitches, or short broadcasts, although their intensity may briefly exceed the preset intensity threshold, causing the control module to send a control signal downstream, the delay drive module will not output a drive signal because the control signal does not last for the preset duration. The switch module remains in an off-state, thus preventing the secondary battery from being falsely woken up. When there is a genuine need to wake up the secondary battery, the communication bus signal must meet the preset intensity threshold of the control module, and the control signal sent by the control module must meet the preset duration of the delay drive module. Only when both the intensity and duration of the communication bus signal meet the conditions will the switch module be triggered to turn on and wake up the secondary battery, achieving more robust wake-up control and further reducing the probability of false triggering during standby.

[0012] In conjunction with the first aspect, according to one embodiment of this application, the control signal is a voltage signal, and the delay drive module includes: a charging unit connected to the control module for charging based on the control signal; and a drive signal generating unit connected between the charging unit and the controlled terminal of the switch module for outputting a drive signal to the controlled terminal of the switch module when the charging voltage of the charging unit exceeds a reference voltage, wherein the reference voltage is the charging voltage corresponding to a preset charging duration of the charging unit.

[0013] In conjunction with the first aspect, according to one embodiment of this application, the charging unit includes a charging capacitor and a first bias resistor. The first terminal of the charging capacitor is connected to the ground of the voltage source, and the second terminal of the charging capacitor is connected to the control module and the drive signal generation unit. The first bias resistor is connected in parallel with the charging capacitor.

[0014] In conjunction with the first aspect, according to one embodiment of this application, the drive signal generation unit includes a comparator, one input terminal of the comparator is connected to the second terminal of the charging capacitor, the other input terminal of the comparator is connected to a reference voltage, and the output terminal of the comparator is connected to the controlled terminal of the switching module.

[0015] In conjunction with the first aspect, according to one embodiment of this application, the wake-up circuit further includes: a current limiting module connected in series between the control module and the charging unit, for receiving a control signal and converting the control signal into a charging current output to the charging unit for charging.

[0016] In conjunction with the first aspect, according to one embodiment of this application, the current limiting module includes a plurality of current limiting resistors and a multiplexer. The first ends of the plurality of current limiting resistors are connected to the control module. The second ends of the plurality of current limiting resistors are respectively connected to the plurality of input terminals of the multiplexer. The output terminal of the multiplexer is connected to the charging unit.

[0017] This embodiment uses a current-limiting module composed of multiple current-limiting resistors and multiplexers. This module limits the control signal output from the control module before it enters the charging unit, converting it into a corresponding charging current. By switching the current-limiting resistor selected by the multiplexer, the magnitude of the charging current entering the charging unit can be changed, thereby affecting the slope of the charging unit voltage rise and the time required to charge to the reference voltage, achieving adjustable control over the charging process duration. Thus, without changing other structural elements, it indirectly achieves adjustment of the preset duration, facilitating flexible setting of the delay threshold based on actual interference environments or wake-up strategies, and improving the battery management system's anti-interference capability and the ability to suppress false wake-ups in the wake-up circuit.

[0018] In conjunction with the first aspect, according to one embodiment of this application, the switching module includes a first switching transistor and a second switching transistor. The auxiliary battery is connected to a voltage source via the first switching transistor, and the controlled terminal of the first switching transistor is connected to the ground of the voltage source via the second switching transistor. The controlled terminal of the second switching transistor serves as the controlled terminal of the switching module.

[0019] In conjunction with the first aspect, according to one embodiment of this application, the first switching transistor is a first transistor, the second switching transistor is a second transistor, the emitter of the first transistor is connected to a voltage source, the collector of the first transistor is connected to a secondary battery, the base of the second transistor is connected to a control module, and the emitter of the second transistor is connected to ground of the voltage source; the switching module further includes a second bias resistor and a third bias resistor, the second bias resistor is connected between the emitter and base of the first transistor, and the third bias resistor is connected between the base of the first transistor and the collector of the second transistor.

[0020] In conjunction with the first aspect, according to one embodiment of this application, the control module includes an optocoupler, the light emitter of the optocoupler is connected to a communication bus to receive signals from the communication bus, the photosensitive element of the optocoupler is connected in series between a voltage source and the controlled terminal of the switching module, and the light emitter is used to emit light after sensing that the signal of the communication bus reaches a preset intensity threshold, so as to trigger the photosensitive element to conduct and output a control signal.

[0021] Secondly, this application also provides an energy storage device, including a main battery, a secondary battery, and a wake-up circuit as described above, wherein the main battery and the secondary battery are electrically connected through the wake-up circuit.

[0022] Further beneficial effects of the second aspect can be found in the first aspect or any possible implementation thereof, and will not be elaborated here. Based on the implementations provided in the above aspects, this application can also be further combined to provide more implementations.

[0023] Other advantages, objectives and features of this application will be partly apparent from the description below, and partly understood by those skilled in the art through study and practice of this application. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the wake-up circuit provided in an embodiment of this application; Figure 2 This is a schematic diagram of the circuit structure of the wake-up circuit provided in the embodiment of this application.

[0026] Explanation of icon numbers: 101. Switching module; 102. Control module; 103. Delay drive module; 104. Current limiting module; MB, main battery; AB, auxiliary battery; VCC, voltage source; Q1, first transistor; Q2, second transistor; R1, first bias resistor; R2, second bias resistor; R3, third bias resistor; Rx, current limiting resistor; MUX, multiplexer; C1, charging capacitor; U1, comparator; L1, LED; L2, photosensitive sensor. Detailed Implementation

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

[0028] In existing energy storage devices, multiple battery modules are typically integrated within a single unit, functionally divided into main batteries and auxiliary batteries: the main battery is continuously powered and responsible for basic functions such as system power-on, bus management, clock maintenance, core control, and safety monitoring; the auxiliary battery remains dormant for extended periods to reduce standby power consumption, and is only awakened to participate in power supply and communication when the load increases, the need for extended battery life increases, or redundancy takes over. Current solutions often rely on communication bus activity or dedicated CAN transceivers with wake-up functionality for wake-up: when a change in the bus physical layer level is detected, the transceiver / interface circuit outputs a wake-up signal to the microcontroller, causing the dormant auxiliary battery to come into operation, thereby ensuring immediate availability while suppressing the static power consumption of the auxiliary battery.

[0029] However, when multiple secondary batteries are connected in parallel and share the same communication bus, the aforementioned bus-activity-based wake-up strategy is prone to false wake-ups: whether it's a broadcast message unrelated to the secondary battery, a heartbeat frame from another node, or disturbances such as noise and glitches, as long as a change in bus level is triggered, the secondary battery may be frequently woken up, causing unnecessary energy consumption, and even over-discharge before actual use. Furthermore, reliance on specific wake-up chips increases material and integration costs, and due to limitations in process and selection consistency, large-scale, low-cost deployment within power management systems is difficult.

[0030] To solve the above technical problems, please refer to Figure 1 and Figure 2 In a first aspect, this application provides a wake-up circuit for a battery management system. The battery management system includes a main battery MB and a secondary battery AB. The main battery MB is used to send a signal to a communication bus when the secondary battery AB needs to be woken up. The wake-up circuit includes: a switch module 101, connected to the secondary battery AB and a voltage source VCC, used to output the supply voltage of the voltage source VCC to the secondary battery AB to wake up the secondary battery AB when it is turned on; and a control module 102, connected to the communication bus and the controlled terminal of the switch module 101 respectively, used to send a control signal to the controlled terminal of the switch module 101 after the signal on the communication bus exceeds a preset strength threshold, so as to control the switch module 101 to be turned on.

[0031] This application discloses a wake-up circuit for receiving signals from a communication bus and controlling the wake-up of a secondary battery AB accordingly. When the wake-up circuit is working, the control module 102 continuously or periodically acquires the signal strength characteristics of the communication bus, such as voltage or current, to quantify the signal and compare it with a preset strength threshold. When the signal of the communication bus exceeds the preset strength threshold, the control module 102 outputs a control signal to the switch module 101. After receiving the control signal, the switch module 101 switches to the on state, thereby outputting the supply voltage to the secondary battery AB and performing a wake-up action on the connected secondary battery AB, causing the secondary battery AB to switch from dormancy to operation, thus participating in power supply or communication. This achieves the effect of targeted wake-up of the secondary battery AB only when the signal strength of the communication bus reaches the threshold, avoiding the technical problem of the secondary battery AB being falsely woken up due to noise interference from the communication bus.

[0032] Compared to existing technologies that indiscriminately wake up secondary batteries AB based on communication bus activities, this application only sends a control signal from the control module 102 to the switch module 101 after the signal strength threshold of the communication bus is met. The wake-up of the secondary battery AB has a threshold; it will not start if the threshold is not reached, and will only be triggered when the threshold is reached. Compared to existing technologies, this application's solution can reduce the probability of false wake-ups caused by non-target signals such as bus broadcasts, heartbeats, or noise disturbances unrelated to the secondary battery AB, and reduce unnecessary static consumption of the secondary battery AB. Simultaneously, the wake-up action is controlled by the control module 102 and the switch module 101 rather than directly following the communication bus activity, making the timing of each secondary battery AB's activation more controllable. This is beneficial for achieving grouped or sequential activation in scenarios with multiple sets of secondary battery ABs connected in parallel, realizing selectivity and stability in waking up the secondary battery ABs, and improving system standby efficiency and anti-interference capabilities.

[0033] In conjunction with the first aspect, according to one embodiment of this application, the wake-up circuit further includes: a delay driving module 103, connected between the control module 102 and the controlled terminal of the switch module 101, for receiving a control signal and outputting a corresponding driving signal to the controlled terminal of the switch module 101 after a preset duration, so as to control the switch module 101 to be turned on.

[0034] Based on the control module 102, this embodiment sets up a delay drive module 103 between the control module 102 and the controlled end of the switch module 101. This ensures that the delay drive module 103 only outputs a drive signal to the controlled end of the switch module 101 to turn it on when the duration of the control signal output by the control module 102 is not shorter than a preset duration. Thus, in addition to the original intensity determination based on the preset intensity threshold, a duration determination is introduced, forming a dual threshold of intensity and time for the communication bus signal.

[0035] The above design effectively filters transient interference on the communication bus: for high-intensity transient pulses caused by noise, glitches, or short broadcasts, although their intensity may briefly exceed the preset intensity threshold, causing the control module 102 to send a control signal downstream, the delay drive module 103 will not output a drive signal because the control signal does not last for the preset duration, and the switch module 101 remains in an unconducted state, thus preventing the secondary battery AB from being falsely awakened. When there is indeed a need to wake up the secondary battery AB, the signal on the communication bus must meet the preset intensity threshold of the control module 102 in terms of intensity, and the control signal sent by the control module 102 must meet the preset duration of the delay drive module 103. Only when both the intensity and duration of the signal on the communication bus meet the conditions will the switch module 101 be triggered to turn on and wake up the secondary battery AB, achieving more robust wake-up control and further reducing the probability of false triggering in standby mode.

[0036] Furthermore, according to one embodiment of this application, the control signal is a voltage signal, and the delay drive module 103 includes: a charging unit connected to the control module 102, used for charging based on the control signal; and a drive signal generating unit connected between the charging unit and the controlled terminal of the switch module 101, used for outputting a drive signal to the controlled terminal of the switch module 101 when the charging voltage of the charging unit exceeds a reference voltage, wherein the reference voltage is the charging voltage corresponding to a preset charging duration of the charging unit.

[0037] In this embodiment, the charging voltage of the charging unit is used as the judgment condition for the output drive signal. Through a voltage integral delay mechanism, the preset duration of the control signal is mapped to a reference voltage: the drive signal is only output when the control signal lasts for a sufficient time to make the charging voltage exceed the reference voltage, thereby effectively filtering transient high-amplitude noise and short pulses and avoiding false wake-ups. At the same time, the delay judgment is realized by the charging of the charging unit, which is simple in structure, low in power consumption, does not require high-frequency sampling or complex logic, and is easy to parameterize the preset duration, thereby improving the stability and consistency of wake-up judgment.

[0038] Furthermore, according to one embodiment of this application, the charging unit includes a charging capacitor C1 and a first bias resistor R1. The first terminal of the charging capacitor C1 is connected to the ground of the voltage source VCC, and the second terminal of the charging capacitor C1 is connected to the control module 102 and the drive signal generation unit. The first bias resistor R1 is connected in parallel with the charging capacitor C1.

[0039] This embodiment provides a specific implementation of the charging unit. The charging capacitor C1 is connected between the control module 102 and the ground of the voltage source VCC. When the control module 102 outputs a control signal, the charging capacitor C1 begins to charge. When the charging capacitor C1 is fully charged, the voltage value of the charging capacitor C1 surges. The drive signal generation unit receives the voltage value obtained by the first bias resistor R1, which is the charging voltage exceeding the reference voltage. This realizes the delayed start logic that converts the preset duration into a voltage value.

[0040] Optionally, according to one embodiment of this application, the drive signal generation unit includes a comparator U1, one input terminal of the comparator U1 is connected to the second terminal of the charging capacitor C1, the other input terminal of the comparator U1 is connected to a reference voltage, and the output terminal of the comparator U1 is connected to the controlled terminal of the switch module 101.

[0041] The drive signal generation unit in this embodiment includes a comparator U1, which converts the judgment result of whether the charging voltage exceeds the reference voltage into a clear digital threshold output: when the charging voltage of the charging unit is lower than the reference voltage, no drive signal is output; once the threshold is exceeded, the comparator U1 flips and outputs a drive signal to the controlled terminal of the switch module 101. The signal has a steep edge and low jitter, improving the determinism and noise immunity of the delay judgment. In addition, the comparator U1 has a high input impedance, so after being connected to the drive circuit, it has little impact on the load of the charging network, has good adaptability, and realizes low power consumption, low complexity and adjustable parameter delay start control.

[0042] In conjunction with the first aspect, according to one embodiment of this application, the wake-up circuit further includes: a current limiting module 104, connected in series between the control module 102 and the charging unit, for receiving a control signal and converting the control signal into a charging current output to the charging unit for charging.

[0043] In conjunction with the first aspect, according to one embodiment of this application, the current limiting module 104 includes a plurality of current limiting resistors Rx and a multiplexer MUX. The first ends of the plurality of current limiting resistors Rx are connected to the control module 102. The second ends of the plurality of current limiting resistors Rx are respectively connected to the plurality of input terminals of the multiplexer MUX. The output terminal of the multiplexer MUX is connected to the charging unit.

[0044] This embodiment uses a current-limiting module 104, composed of multiple current-limiting resistors Rx and a multiplexer MUX, to limit the control signal output by the control module 102 before it enters the charging unit, converting it into a corresponding charging current. By switching the current-limiting resistor Rx selected by the multiplexer MUX, the magnitude of the charging current entering the charging unit can be changed, thereby affecting the slope of the charging unit voltage rise and the time required to charge to the reference voltage, achieving adjustable control of the charging process duration. Thus, without changing other structures, the preset duration can be adjusted, facilitating flexible setting of the delay threshold according to the actual interference environment or wake-up strategy, and improving the anti-interference capability of the battery management system and the false wake-up suppression capability of the wake-up circuit.

[0045] In conjunction with the first aspect, according to one embodiment of this application, the switching module 101 includes a first switching transistor and a second switching transistor. The auxiliary battery AB is connected to the voltage source VCC via the first switching transistor. The controlled terminal of the first switching transistor is connected to the ground of the voltage source VCC via the second switching transistor. The controlled terminal of the second switching transistor serves as the controlled terminal of the switching module 101.

[0046] This embodiment achieves safe, stable, and low-leakage control of the connection between the secondary battery AB and the voltage source VCC through a two-stage control logic of the second and first switches. When no drive signal is received, the second switch is turned off, disconnecting the first switch from the ground of the voltage source VCC. The first switch is turned off, and the secondary battery AB is disconnected from the voltage source VCC. When a drive signal is received, the second switch is turned on, connecting the controlled terminal of the first switch to the ground of the voltage source VCC, that is, pulling the controlled terminal of the first switch to the desired potential, driving the first switch to turn on to form a low-resistance path between the secondary battery AB and the voltage source VCC.

[0047] Furthermore, according to one embodiment of this application, the first switching transistor is a first transistor Q1, and the second switching transistor is a second transistor Q2. The emitter of the first transistor Q1 is connected to the voltage source VCC, and the collector of the first transistor Q1 is connected to the secondary battery AB. The base of the second transistor Q2 is connected to the control module 102, and the emitter of the second transistor Q2 is connected to the ground of the voltage source VCC. The switching module 101 also includes a second bias resistor R2 and a third bias resistor R3. The second bias resistor R2 is connected between the emitter and base of the first transistor Q1, and the third bias resistor R3 is connected between the base of the first transistor Q1 and the collector of the second transistor Q2.

[0048] This embodiment provides a specific circuit for a switching module 101. When the switching module is in the off state, the second transistor Q2 is off, and the base of the first transistor Q1 is disconnected from the ground of the voltage source VCC, thus the first transistor Q1 is off. After receiving a drive signal at the controlled terminal of the switching module, i.e., the base of the second transistor Q2, the second transistor Q2 turns on. The second bias resistor R2 and the third bias resistor R3 are connected in series between the voltage source VCC and ground. The base of the first transistor Q1 is connected to the node voltage between the second bias resistor R2 and the third bias resistor R3, thus the first transistor Q1 turns on. The secondary battery AB is connected to the voltage source VCC, thereby waking up the secondary battery AB.

[0049] In conjunction with the first aspect, according to one embodiment of this application, the control module 102 includes an optocoupler. The light emitter L1 of the optocoupler is connected to a communication bus to receive signals from the communication bus. The photosensitive element L2 of the optocoupler is connected in series between the voltage source VCC and the controlled terminal of the switch module 101. The light emitter L1 emits light after sensing that the signal from the communication bus reaches a preset intensity threshold, thereby triggering the photosensitive element L2 to conduct and output a control signal.

[0050] This embodiment provides a specific structure of a control module 102, which uses an optocoupler to sample signals from the communication bus, and transmits signals between the photosensitive device L2 and the light emitter L1 via optical signals, thereby achieving circuit isolation between the auxiliary battery AB and the main battery MB and improving the safety of the drive circuit.

[0051] Secondly, this application also provides an energy storage device, including a main battery MB, a secondary battery AB, and a wake-up circuit as described in the above embodiment, wherein the main battery MB and the secondary battery AB are electrically connected through the wake-up circuit.

[0052] Because the energy storage device provided in the second aspect of this application includes the driving circuit provided in the first aspect, the energy storage device also possesses at least the various technical effects of the first aspect. Further beneficial effects of the second aspect can be found in the first aspect or any possible implementation thereof, and will not be elaborated upon here. Based on the implementations provided in the above aspects, this application can also make further combinations to provide more implementations.

[0053] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0054] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0055] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0056] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the design concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A wake-up circuit, characterized in that, A battery management system is used, the battery management system including a main battery and a secondary battery, the main battery being used to send a signal to a communication bus when the secondary battery needs to be woken up, the wake-up circuit including: A switching module, connecting the secondary battery and a voltage source, is used to output the supply voltage from the voltage source to the secondary battery to wake it up when it is turned on; The control module is connected to the communication bus and the controlled terminal of the switch module respectively, and is used to send a control signal to the controlled terminal of the switch module after the signal on the communication bus exceeds a preset strength threshold, so as to control the switch module to be turned on.

2. The wake-up circuit according to claim 1, characterized in that, The wake-up circuit also includes: A delay drive module is connected between the control module and the controlled terminal of the switch module. It is used to receive the control signal and output a corresponding drive signal to the controlled terminal of the switch module after the signal has been continuously for a preset duration, so as to control the switch module to be turned on.

3. The wake-up circuit according to claim 2, characterized in that, The control signal is a voltage signal, and the delay drive module includes: A charging unit, connected to the control module, is used for charging based on the control signal; A drive signal generating unit is connected between the charging unit and the controlled terminal of the switching module. When the charging voltage of the charging unit exceeds a reference voltage, the drive signal is output to the controlled terminal of the switching module. The reference voltage is the charging voltage corresponding to the preset charging duration of the charging unit.

4. The wake-up circuit according to claim 3, characterized in that, The charging unit includes a charging capacitor and a first bias resistor. The first end of the charging capacitor is connected to the ground of the voltage source, and the second end of the charging capacitor is connected to the control module and the drive signal generation unit. The first bias resistor is connected in parallel with the charging capacitor.

5. The wake-up circuit according to claim 4, characterized in that, The drive signal generation unit includes a comparator. One input terminal of the comparator is connected to the second terminal of the charging capacitor, the other input terminal of the comparator is connected to the reference voltage, and the output terminal of the comparator is connected to the controlled terminal of the switching module.

6. The wake-up circuit according to claim 3, characterized in that, The wake-up circuit also includes: A current limiting module, connected in series between the control module and the charging unit, is used to receive the control signal and convert the control signal into a charging current output to the charging unit for charging.

7. The wake-up circuit according to claim 6, characterized in that, The current limiting module includes multiple current limiting resistors and a multiplexer. The first ends of the multiple current limiting resistors are connected to the control module. The second ends of the multiple current limiting resistors are respectively connected to the multiple input terminals of the multiplexer. The output terminal of the multiplexer is connected to the charging unit.

8. The wake-up circuit according to any one of claims 1-7, characterized in that, The switching module includes a first switching transistor and a second switching transistor. The auxiliary battery is connected to the voltage source via the first switching transistor. The controlled terminal of the first switching transistor is connected to the ground of the voltage source via the second switching transistor. The controlled terminal of the second switching transistor serves as the controlled terminal of the switching module.

9. The wake-up circuit according to claim 8, characterized in that, The first switching transistor is a first transistor, the second switching transistor is a second transistor, the emitter of the first transistor is connected to the voltage source, the collector of the first transistor is connected to the auxiliary battery, the base of the second transistor is connected to the control module, and the emitter of the second transistor is connected to the ground of the voltage source. The switching module further includes a second bias resistor and a third bias resistor. The second bias resistor is connected between the emitter and base of the first transistor, and the third bias resistor is connected between the base of the first transistor and the collector of the second transistor.

10. The wake-up circuit according to any one of claims 1-7, characterized in that, The control module includes an optocoupler, the light emitter of which is connected to the communication bus to receive signals from the communication bus. The photosensitive element of the optocoupler is connected in series between the voltage source and the controlled terminal of the switching module. The light emitter emits light after sensing that the signal from the communication bus reaches a preset intensity threshold, thereby triggering the photosensitive element to conduct and output the control signal.

11. An energy storage device, characterized in that, It includes a main battery, a secondary battery, and a wake-up circuit according to any one of claims 1-10, wherein the main battery and the secondary battery are electrically connected through the wake-up circuit.

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