Battery management system, wake-up method, battery system and power-consuming device

Abstract

The present application discloses a battery management system, a wake-up method, a battery system and an electric device. The battery management system includes a power supply module, a comparison module, a charge and discharge module and an output module. The positive input terminal of the comparison module is connected to the power supply module, the negative input terminal of the comparison module is connected to the first terminal of the charge and discharge module, and the output terminal of the comparison module is connected to the second terminal of the charge and discharge module and the first terminal of the output module respectively; wherein: the comparison module is configured to compare the output voltage of the charge and discharge module with a preset threshold value and output a first voltage signal; and the working mode of the charge and discharge module is controlled according to the first voltage signal so that the output voltage of the charge and discharge module is increased or decreased; the output module is configured to generate a target wake-up signal according to the level state of the first voltage signal. In this way, the battery management system has a simple structure, can not only output a timed wake-up signal, but also reduce costs and circuit power consumption.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a battery management system, a wake-up method, a battery system and an electrical device. Background Art

[0002] Power consumption is a parameter that needs to be focused on in many product designs. Switching the device's working mode from continuous operation to timed operation can effectively reduce power consumption. For example, sensors on new energy vehicles are in a low-power sleep state most of the time. After being awakened by a wake-up signal, they return to sleep after completing their work until the next wake-up signal is received.

[0003] In the related art, the wake-up signal can be sent by the existing wake-up circuit of hardware timing chips such as single-chip microcomputers and clock chips, which is not only costly but also consumes high power. Summary of the invention

[0004] The present application mainly provides a battery management system, a wake-up method, a battery system and an electrical device. The battery management system has a simple structure and can not only output a timed wake-up signal but also reduce costs and circuit power consumption.

[0005] The technical solution of this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a battery management system, the battery management system includes a power supply module, a comparison module, a charge and discharge module and an output module, the positive input terminal of the comparison module is connected to the power supply module, the negative input terminal of the comparison module is connected to the first terminal of the charge and discharge module, and the output terminal of the comparison module is connected to the second terminal of the charge and discharge module and the first terminal of the output module respectively; wherein:

[0007] A comparison module is configured to compare the output voltage of the charge and discharge module with a preset threshold value, output a first voltage signal, and control the working mode of the charge and discharge module according to the first voltage signal to increase or decrease the output voltage of the charge and discharge module;

[0008] The output module is configured to generate a target wake-up signal according to the level state of the first voltage signal.

[0009] Through the above-mentioned technical means, the comparison module compares the output voltage of the charging and discharging module with the preset threshold value, outputs a first voltage signal, and further generates a target wake-up signal according to the level state of the first voltage signal. In this way, there is no need to set up an additional hardware timing chip, and the target wake-up signal can be output based on the circuit structure including the power supply module, the comparison module, the charging and discharging module and the output module. Moreover, due to the simple circuit structure, this circuit structure can not only reduce the circuit cost, but also output a timed wake-up signal by controlling the charging and discharging time of the charging and discharging circuit. In addition, since the output of the target wake-up signal does not require the control of the hardware timing chip, the power consumption of the circuit is also reduced.

[0010] In some embodiments, the comparison module includes a comparator unit, a feedback unit and a pull-up unit, wherein: the positive input terminal of the comparator unit is connected to the power supply module, the negative input terminal of the comparator unit is connected to the first terminal of the charge and discharge module, and the output terminal of the comparator unit is respectively connected to the second terminal of the charge and discharge module and the first terminal of the output module; the feedback unit is connected between the positive input terminal of the comparator unit and the output terminal of the comparator unit, and the pull-up unit is connected to the output terminal of the comparator unit; the comparison module is configured such that when the output voltage of the charge and discharge module is less than a preset lower limit value, the output first voltage signal is in a first level state; or, when the output voltage of the charge and discharge module is greater than a preset upper limit value, the output first voltage signal is in a second level state.

[0011] Through the above technical means, a hysteresis comparator is formed by a comparator unit and a feedback unit, and a first voltage signal in a second level state is output when the output voltage of the charge and discharge module is greater than a preset upper limit value, or a first level signal in a high-impedance state is output when the output voltage of the charge and discharge module is less than a preset lower limit value, and the first level signal is pulled up to the first level state through a pull-up unit. In this way, by setting a preset lower limit value and a preset upper limit value, the output voltage of the charge and discharge module is compared with them, and then a target wake-up signal with a suitable period and no noise is output, thereby improving the stability and reliability of the battery management system.

[0012] In some embodiments, the power supply module includes a voltage divider unit and a first power supply, and the voltage divider unit includes a first resistor unit and a second resistor unit; wherein: the first end of the first resistor unit is connected to the first power supply, the second end of the first resistor unit is respectively connected to the positive input end of the comparator unit and the first end of the second resistor unit; the second end of the second resistor unit is grounded.

[0013] Through the above technical means, the power supply module is composed of the first resistor unit, the second resistor unit and the first power supply, and the voltage is output to the positive terminal of the comparator unit together with the above feedback unit as a reference voltage signal. In this way, when the output voltage of the charge and discharge module reaches the preset upper limit value or the preset lower limit value, the level state of the first voltage signal output by the comparator unit can be reversed, thereby stably outputting the target wake-up signal.

[0014] In some embodiments, the output module includes a first switch tube and a second power supply; wherein: the first end of the first switch tube is connected to the second power supply, and the control end of the first switch tube is respectively connected to the output end of the comparison module and the first end of the charge and discharge module; the first switch tube is configured to be turned off when the first voltage signal is in a first level state, so that the second end of the first switch tube outputs a target wake-up signal in a second level state, or to be turned on when the first voltage signal is in a second level state, so that the second end of the first switch tube outputs a target wake-up signal in a first level state.

[0015] Through the above technical means, the first voltage signal is used to control the on or off of the first switch tube, thereby controlling whether the output voltage of the second power supply is output to the back end. In this way, a periodic target wake-up signal can be output through the second end of the first switch tube, and the stability of the target wake-up signal is maintained.

[0016] In some embodiments, the charge and discharge module includes an energy storage unit and a first discharge unit; wherein: the first end of the first discharge unit is respectively connected to the second end of the feedback unit, the output end of the comparator unit and the second end of the pull-up unit, the second end of the first discharge unit is connected to the first end of the energy storage unit, and the second end of the energy storage unit is grounded; the first end of the energy storage unit is also connected to the negative input end of the comparator unit, and is configured to provide the comparator unit with the output voltage of the charge and discharge module.

[0017] Through the above technical means, the energy storage unit is periodically charged and discharged, so that the voltage signal input to the negative terminal of the comparator unit changes, and then the target wake-up signal with a suitable cycle length is output. In addition, by setting the first discharge unit, the discharge speed of the energy storage unit can be adjusted to further change the duty cycle of the target wake-up signal.

[0018] In some embodiments, the charge and discharge module also includes a second discharge unit and a first diode; wherein: the first end of the first diode is connected to the first end of the first discharge unit, and the second end of the first diode is connected to the first end of the second discharge unit; the second end of the second discharge unit is connected to the first end of the energy storage unit.

[0019] Through the above technical means, by setting the second discharge unit and the first diode, the charging time of the energy storage unit can be made longer than the discharging time, so as to output a target wake-up signal with a duty cycle that meets the requirements.

[0020] In some embodiments, the battery management system also includes a second diode, which is connected between the control module and the negative input terminal of the comparator unit; wherein: the battery management system is configured to continuously output a target wake-up signal in the first level state through the output module when receiving an enable signal in the first level state sent by the control module.

[0021] Through the above-mentioned technical means, the target wake-up signal is controlled by the enable signal to maintain a high-level output state, so that the subsequent stage can continue to work when needed, thereby expanding the function of the battery management system and improving the flexibility of the battery management system.

[0022] In some embodiments, the battery management system also includes a control module and an awakened module; wherein: the control module is connected to the comparison module and is configured to send an enable signal in a first level state to the comparison module; the awakened module is connected to the output end of the output module and is configured to receive a target awakening signal sent by the output module to control the working state of the awakened module.

[0023] Through the above technical means, the circuit structure of the battery management system is simple, and a periodic target wake-up signal can be output to the awakened module without chip control. Moreover, the period duration of the output target wake-up signal is adjustable, which has high flexibility.

[0024] In a second aspect, an embodiment of the present application provides a wake-up method, which is applied to a battery management system as described in any one of the first aspects, the method comprising: a comparison module compares the output voltage of a charge and discharge module with a preset threshold value, and outputs a first voltage signal; and controls the working mode of the charge and discharge module according to the first voltage signal to increase or decrease the output voltage of the charge and discharge module; and the output module generates a target wake-up signal according to the level state of the first voltage signal.

[0025] Through the above-mentioned technical means, the comparison module compares the output voltage of the charging and discharging module with the preset threshold value, outputs a first voltage signal, and further generates a target wake-up signal according to the level state of the first voltage signal. In this way, there is no need to set up an additional hardware timing chip, and based on the circuit structure including the power supply module, the comparison module, the charging and discharging module and the output module, the target wake-up signal can be output. Moreover, due to the simple circuit structure, this circuit structure can also reduce the circuit cost. In addition, since the output of the target wake-up signal does not require the control of the hardware timing chip, the power consumption of the circuit is also reduced.

[0026] In some embodiments, the comparison module compares the output voltage of the charge and discharge module with a preset threshold value and outputs a first voltage signal; and controls the working mode of the charge and discharge module according to the first voltage signal to increase or decrease the output voltage of the charge and discharge module, including: when the output voltage of the charge and discharge module is less than the preset lower limit value, the first voltage signal output by the comparison module is in a first level state, and the charge and discharge module is controlled to be in a charging mode, so that the output voltage of the charge and discharge module is increased; when the output voltage of the charge and discharge module is greater than the preset upper limit value, the first voltage signal output by the comparison module is in a second level state, and the charge and discharge module is controlled to be in a discharging mode, so that the output voltage of the charge and discharge module is reduced.

[0027] Through the above technical means, when the output voltage of the charge and discharge module is greater than the preset upper limit value, the first voltage signal in the second level state is output, or when the output voltage of the charge and discharge module is less than the preset lower limit value, the first level signal in the high impedance state is output, and the first level signal is pulled up to the first level state through the pull-up unit. In this way, by setting the preset lower limit value and the preset upper limit value, the output voltage of the charge and discharge module is compared with them, and then the target wake-up signal with a suitable period and no noise is output, thereby improving the stability and reliability of the battery management system.

[0028] In some embodiments, the output module generates a target wake-up signal according to the level state of the first voltage signal, including: when the first voltage signal is in a first level state, the first switch tube is turned off to generate a target wake-up signal in a second level state; or, when the first voltage signal is in a second level state, the first switch tube is turned on to generate a target wake-up signal in a first level state.

[0029] Through the above technical means, the first voltage signal is used to control the on or off of the first switch tube, thereby controlling whether the output voltage of the second power supply is output to the back end. In this way, a periodic target wake-up signal can be output through the second end of the first switch tube, and the stability of the target wake-up signal is maintained.

[0030] In a third aspect, an embodiment of the present application provides a battery system, the battery system comprising a battery and a battery management system as described in any one of the first aspects.

[0031] In a fourth aspect, an embodiment of the present application provides an electrical device, which includes the battery system described in the third aspect.

[0032] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the technical solutions of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 1 ;

[0034] Figure 2 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 2 ;

[0035] Figure 3 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 3 ;

[0036] Figure 4 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 4 ;

[0037] Figure 5 A schematic diagram of an output voltage waveform of a second power supply provided in an embodiment of the present application;

[0038] Figure 6 A waveform diagram of a target wake-up signal provided in an embodiment of the present application;

[0039] Figure 7 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 5 ;

[0040] Figure 8 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 6 ;

[0041] Fig. 9 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 7 ;

[0042] Fig.10 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 8 ;

[0043] Fig.11 A flowchart of a wake-up method provided in an embodiment of the present application;

[0044] Fig.12 A schematic diagram of the structure of a battery system provided in an embodiment of the present application;

[0045] Fig.13 A schematic diagram of the structure of an electrical device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0048] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0049] It should also be pointed out that the terms "first\second\third" involved in the embodiments of the present application are only used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0050] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] The following is an introduction to the related technologies of this application.

[0052] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in areas such as energy storage.

[0053] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0054] In the embodiments of the present application, the battery may be a battery cell, or may be a battery pack (Pack) composed of multiple battery cells. A battery cell refers to a basic unit that can realize the mutual conversion of chemical energy and electrical energy, and can be used to make a battery module or a battery pack, so as to supply power to an electrical device. A battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged. The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present disclosure.

[0055] In the embodiment of the present application, the battery may also be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid connection through a busbar component.

[0056] In new energy vehicles, chips that consume a lot of power and contain many transistors are required to support some more complex functions, such as the timed wake-up function. However, users also hope that the battery pack can have a longer service life without frequent charging. Therefore, power consumption is a parameter that needs to be focused on when designing the battery pack. Switching the working mode of some devices, such as sensors, from continuous working mode to timed working mode can effectively reduce power consumption.

[0057] At present, the low-power wake-up mode of the module to be awakened can generally be achieved by adopting a timed wake-up mode, that is, the module to be awakened is in a low-power sleep mode for most of the time, and is awakened by an external wake-up signal input to the module to be awakened. After awakening, the module to be awakened immediately starts working, and enters a low-power sleep mode again after completing the work until the next wake-up signal is received to start working. Among them, the wake-up signal can be sent by an existing wake-up circuit such as a single-chip microcomputer and a clock chip. For example, the timing function of the clock chip is directly used to send a signal once at a time; or the timing function is realized by relying on a single-chip microcomputer, and the single-chip microcomputer inputs an enable signal to reset the timing circuit each time. However, this technical solution using a single-chip microcomputer, a clock chip, etc. is not only costly and not suitable for low-cost applications, but also when the module to be awakened is in a sleep state, the hardware timing chip still needs to maintain normal operation, and the power consumption is still relatively high.

[0058] Based on this, the embodiments of the present application provide a battery management system, a wake-up method, a battery system and an electrical device, wherein the comparison module compares the output voltage of the charge and discharge module with the preset threshold value, outputs a first voltage signal, and further generates a target wake-up signal according to the level state of the first voltage signal. In this way, there is no need to set up an additional hardware timing chip, and based on the circuit structure including a power supply module, a comparison module, a charge and discharge module and an output module, the target wake-up signal can be output. Moreover, due to the simple circuit structure, this circuit structure can not only reduce the circuit cost, but also output a timed wake-up signal by controlling the charge and discharge time of the charge and discharge circuit. In addition, since the output of the target wake-up signal does not require the control of the hardware timing chip, the power consumption of the circuit is also reduced.

[0059] The present application is further described in detail below through the accompanying drawings and specific embodiments.

[0060] In one embodiment of the present application, Figure 1 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 1 .like Figure 1 As shown, the battery management system 10 includes a power supply module 101, a comparison module 102, a charge and discharge module 103 and an output module 104, the positive input terminal of the comparison module 102 is connected to the power supply module 101, the negative input terminal of the comparison module 102 is connected to the first terminal of the charge and discharge module 103, and the output terminal of the comparison module 102 is connected to the second terminal of the charge and discharge module 103 and the first terminal of the output module 104 respectively; wherein:

[0061] The comparison module 102 is configured to compare the output voltage of the charge-discharge module 103 with a preset threshold value, output a first voltage signal, and control the working mode of the charge-discharge module 103 according to the first voltage signal, so as to increase or decrease the output voltage of the charge-discharge module 103;

[0062] The output module 104 is configured to generate a target wake-up signal according to the level state of the first voltage signal.

[0063] In an embodiment of the present application, a power supply can be provided in the power supply module 101, which can output a continuous and stable voltage signal to the positive input terminal of the comparison module 102, and input the voltage signal together with the feedback voltage signal of the comparison module 102 to the positive input terminal of the comparison module 102, serving as a reference voltage signal for comparing the voltage signal input to the negative input terminal of the comparison module 102. It should be understood that the voltage value of the reference voltage signal changes with the change of the feedback voltage signal of the comparison module 102.

[0064] In the embodiment of the present application, the comparison module 102 may include a device for voltage comparison, such as a differential comparator, a digital comparator, a linear comparator, a hysteresis comparator, etc., which is not specifically limited here. The comparison module 102 can compare the output voltage of the power supply module 101 input by the positive input terminal and the output voltage of the charge and discharge module 103 input by the negative input terminal, and output a corresponding voltage signal from the output terminal according to the comparison result.

[0065] In the embodiment of the present application, the charge and discharge module 103 may include a device capable of charging and discharging, such as a capacitor, etc. Thus, the working mode of the charge and discharge module 103 may include a charging working mode and a discharging working mode. In the charging working mode, the output voltage of the charge and discharge module 103 gradually increases; in the discharging working mode, the output voltage of the charge and discharge module 103 gradually decreases.

[0066] In the embodiment of the present application, the preset threshold value can be jointly determined according to the devices in the path of the input feedback voltage signal in the power supply module 101 and the comparison module 102. The preset threshold value may include multiple values, for example, a preset upper limit value and a preset lower limit value, and the output voltage of the charge and discharge module 103 may be compared with the reference voltage signal input to the positive terminal of the comparison module 102, and when the output voltage of the charge and discharge module 103 reaches the preset threshold value, the first voltage signal output by the comparison module 102 is caused to achieve a level flip.

[0067] In the embodiment of the present application, the output module 104 may include a triode, a transistor, an IGBT, a metal-oxide-semiconductor field-effect transistor (MOSFET), or even a switch component, etc. In addition, according to the channel type classification, the output module 104 may be an N-type switch tube, or a P-type switch tube; neither is specifically limited here.

[0068] For example, in the embodiment of the present application, the battery management system 10 starts working after being powered on, and no electric energy is stored in the charge and discharge module 103. At this time, the output voltage of the charge and discharge module 103 is lower than the preset threshold value, and the input voltage of the positive terminal of the comparison module 102 is higher than the input voltage of the negative terminal, that is, the voltage value of the aforementioned reference voltage signal is higher than the output voltage of the charge and discharge module 103, so that the first voltage signal output by the comparison module 102 is high level, and the charge and discharge module 103 enters the charging working mode, and the output voltage of the charge and discharge module 103 gradually increases. Further, the output module 104 outputs a target wake-up signal in a low level state according to the first voltage signal in a high level.

[0069] It should be noted that the charge and discharge module 103 continues to charge until its output voltage is higher than the preset threshold value, the input voltage of the positive terminal of the comparison module 102 is lower than the input voltage of the negative terminal, that is, the voltage value of the aforementioned reference voltage signal is lower than the output voltage of the charge and discharge module 103, so that the first voltage signal output by the comparison module 102 is low level, and the charge and discharge module 103 enters the discharge working mode, and the output voltage of the charge and discharge module 103 gradually decreases. Further, the output module 104 outputs a target wake-up signal in a high level state according to the first voltage signal in a low level.

[0070] Next, the charge and discharge module 103 can enter the charging mode again when the discharge value is lower than the preset threshold value, and the cycle is repeated so that the battery management system 10 outputs a target wake-up signal, and the target wake-up signal has the characteristics of periodicity and square wave. It should also be noted that by adjusting the parameters of the devices in the charge and discharge module 103, the time length of each cycle in the target wake-up signal, the duty cycle and other parameters can be controlled.

[0071] An embodiment of the present application provides a battery management system, in which a comparison module compares the output voltage of the charging and discharging module with a preset threshold value, outputs a first voltage signal, and further generates a target wake-up signal according to the level state of the first voltage signal. In this way, there is no need to set up an additional hardware timing chip, and based on the circuit structure including a power supply module, a comparison module, a charging and discharging module, and an output module, a target wake-up signal can be output. Moreover, due to the simple circuit structure, this circuit structure can also reduce the circuit cost. In addition, since the output of the target wake-up signal does not require the control of the hardware timing chip, the power consumption of the circuit is also reduced.

[0072] In another embodiment of the present application, Figure 2 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 2 .like Figure 2 As shown, the comparison module 102 includes a comparator unit, a feedback unit and a pull-up unit, wherein:

[0073] The positive input terminal of the comparator unit is connected to the power supply module 101, the negative input terminal of the comparator unit is connected to the first terminal of the charge and discharge module 103, and the output terminal of the comparator unit is connected to the second terminal of the charge and discharge module 103 and the first terminal of the output module 104 respectively;

[0074] The feedback unit is connected between the positive input terminal of the comparator unit and the output terminal of the comparator unit, and the pull-up unit is connected to the output terminal of the comparator unit;

[0075] The comparison module 102 is configured to output a first voltage signal at a first level when the output voltage of the charge and discharge module 103 is less than a preset lower limit value; or, when the output voltage of the charge and discharge module 103 is greater than a preset upper limit value, output the first voltage signal at a second level state.

[0076] In an embodiment of the present application, the comparator unit and the feedback unit can form a hysteresis comparator having a hysteresis loop transmission characteristic. Among them, the comparator unit may include a voltage comparator U1 and a third power supply V3 for powering the voltage comparator. The feedback unit may include a third resistor R3. The third resistor R3 is connected between the positive input terminal and the output terminal of the voltage comparator U1, and is used to introduce the first voltage signal output by the voltage comparator U1 as feedback into the positive input terminal of the voltage comparator U1. It should be understood that the first voltage signal output by the hysteresis comparator will not immediately follow the input signal when the voltage signal input at the negative terminal changes, but will only change after the voltage signal input at the negative terminal reaches a certain preset threshold value, and due to the hysteresis characteristic, the noise generated by the power supply module 101 can be eliminated. Therefore, in the embodiment of the present application, the hysteresis comparator needs to set two preset threshold values, namely, a preset lower limit value and a preset upper limit value. The preset upper limit value refers to the output voltage of the charge and discharge module 103, that is, when the input voltage signal at the negative terminal of the voltage comparator reaches this value, the first voltage signal output by the hysteresis comparator changes from a high-impedance state to a second level state; in addition, the preset lower limit value refers to the output voltage of the charge and discharge module 103, that is, when the input voltage signal at the negative terminal of the voltage comparator reaches this value, the first voltage signal output by the hysteresis comparator changes from the second level state to a high-impedance state.

[0077] Wherein, exemplarily, in the embodiment of the present application, the first level state may refer to a high level state, and the second level state may refer to a low level state.

[0078] In the embodiment of the present application, the pull-up unit may include a fourth resistor R4 and a fourth power supply V4, so as to clamp the first voltage signal in a high-impedance state output by the hysteresis comparator to a first level state, that is, a high level state.

[0079] It should be noted that the resistance values ​​of the third resistor R3 and the fourth resistor R4 can be determined according to actual needs. In addition, the specific values ​​of the preset lower limit value and the preset upper limit value can be determined according to the resistance value of the feedback unit and the resistance value of the power supply module 101.

[0080] It should also be noted that in the embodiment of the present application, the feedback unit includes a third resistor R3 and the pull-up unit includes a fourth resistor R4. In some embodiments, the feedback unit and the pull-up unit may include a circuit composed of multiple resistors connected in series, in parallel, or in series and parallel, which is not specifically limited here.

[0081] In an embodiment of the present application, a reference voltage signal is jointly generated by the power supply module 101 and the feedback unit and input into the positive terminal of the comparator unit, and the output voltage of the charge and discharge module 103 is input into the negative terminal of the comparator unit. After the battery management system 10 is powered on, no electric energy is stored in the charge and discharge module 103, and the charging operation mode is entered. The voltage input to the positive terminal of the comparator unit is greater than the voltage input to the negative terminal of the comparator unit, and the first voltage signal output by the comparator unit is in a high-impedance state. The first voltage signal in the high-impedance state is pulled up to the first level state through the pull-up unit, and is input into the output module 104 as the first voltage signal in the first level state, so that the output module 104 outputs a target wake-up signal in the second level state.

[0082] Furthermore, when the charge and discharge module 103 continues to charge and its output voltage reaches a preset upper limit value, the voltage input to the negative terminal of the comparator unit is greater than the voltage input to the positive terminal of the comparator unit, then the first voltage signal output by the comparator unit is in a second level state, and the charge and discharge module 103 enters a discharge working mode, and inputs the first voltage signal to the output module 104, so that the output module 104 outputs a target wake-up signal in a first level state.

[0083] It should be noted that when the charge-discharge module 103 discharges until its output voltage reaches the preset lower limit, the voltage input to the positive terminal of the comparator unit is greater than the voltage input to the negative terminal of the comparator unit, and the charge-discharge module 103 continues to enter the charging mode, and the first voltage signal output by the comparator unit is in a high-impedance state, and the first voltage signal in the high-impedance state is pulled up to the first level state through the pull-up unit. In this way, the repetitive cyclic charge-discharge process forms a target wake-up signal with a square wave waveform and presents periodicity.

[0084] An embodiment of the present application provides a battery management system, in which a comparison module compares the output voltage of the charge and discharge module with a preset threshold value, outputs a first voltage signal, and further generates a target wake-up signal based on the level state of the first voltage signal. In this way, there is no need to set up an additional hardware timing chip, and based on the circuit structure including a power supply module, a comparison module, a charge and discharge module, and an output module, it is possible to output a target wake-up signal. Moreover, due to the simple circuit structure, this circuit structure can not only reduce the circuit cost, but also output a timed wake-up signal by controlling the charge and discharge time of the charge and discharge circuit. In addition, since the output of the target wake-up signal does not require the control of a hardware timing chip, the power consumption of the circuit is also reduced.

[0085] In some embodiments, Figure 3 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 3 .like Figure 3As shown, the power supply module 101 includes a voltage dividing unit and a first power supply, and the voltage dividing unit includes a first resistance unit and a second resistance unit; wherein:

[0086] A first end of the first resistor unit is connected to the first power supply V1, and a second end of the first resistor unit is connected to the positive input end of the comparator unit and the first end of the second resistor unit respectively;

[0087] The second end of the second resistance unit is grounded.

[0088] In the embodiment of the present application, the first resistance unit and the second resistance unit may also include a circuit composed of a plurality of resistors connected in series, in parallel, or in series and in parallel. Figure 3 As shown, the first resistance unit may include a first resistor R1, and the second resistance unit may include a second resistor R2.

[0089] It should be noted that in the embodiment of the present application, the preset lower limit value It can be determined based on formula (1):

[0090] (1)

[0091] In the embodiment of the present application, the preset upper limit value It can be determined based on formula (2):

[0092] (2)

[0093] in, is the voltage value output by the first power supply V1, is the voltage value of the first voltage signal output by the comparator unit, is the preset lower limit value, is the preset upper limit value.

[0094] It should be noted that the output voltage value of the first power supply V1 can be set according to actual needs, but the output voltage value of the first power supply V1 remains stable during the output period.

[0095] It should also be noted that the hysteresis comparator can be composed of a voltage comparator U1, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4. Therefore, adjusting the resistance values ​​of the above resistors can adjust the preset lower limit value. The value and the preset upper limit Make adjustments.

[0096] The embodiment of the present application provides a battery management system, which comprises a power supply module composed of a first resistor unit, a second resistor unit and a first power supply, and outputs a voltage to the positive terminal of a comparator unit together with the aforementioned feedback unit as a reference voltage signal. In this way, when the output voltage of the charge and discharge module reaches a preset upper limit value or a preset lower limit value, the level state of the first voltage signal output by the comparator unit can be reversed, thereby stably outputting a target wake-up signal.

[0097] In some embodiments, Figure 4 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 4 .like Figure 4 As shown, the output module 104 includes a first switch tube Q1 and a second power supply V2; wherein:

[0098] The first end of the first switch tube Q1 is connected to the second power supply V2, and the control end of the first switch tube Q1 is connected to the output end of the comparison module 102 and the first end of the charge and discharge module 103 respectively;

[0099] The first switch tube Q1 is configured to be turned off when the first voltage signal is in a first level state, so that the second end of the first switch tube Q1 outputs a target wake-up signal in a second level state, or to be turned on when the first voltage signal is in a second level state, so that the second end of the first switch tube Q1 outputs a target wake-up signal in a first level state.

[0100] In the embodiment of the present application, the first switch tube Q1 may be a triode or a MOS tube. For example, when the first switch tube Q1 may be a PMOS tube, the voltage between the gate and the source ( ) is less than or equal to the threshold voltage When the first switch tube Q1 is turned on, the first switch tube Q1 is turned on; otherwise, the first switch tube Q1 is turned off.

[0101] In the embodiment of the present application, the second power supply V2 is connected to the first end of the first switch tube Q1, that is, the source (S pole), and its output voltage can be adjusted according to the threshold voltage. In addition, the control end (G pole) of the first switch tube Q1 is used to receive the first voltage signal, and the second end (D pole) of the second switch tube is used to output the target wake-up signal.

[0102] It should be noted that when the first voltage signal is in the first level state, the voltage between the gate and the source of the first switch tube Q1 is greater than the threshold voltage , the first switch tube Q1 is turned off, and the second end of the first switch tube Q1 outputs a target wake-up signal in a second level state; when the first voltage signal is in the second level state, the voltage between the gate and the source of the first switch tube Q1 is less than the threshold voltage When the first switch tube Q1 is turned on, the output voltage of the second power supply V2 is output as the target wake-up signal in the first level state.

[0103] In the embodiments of the present application, Figure 5 A schematic diagram of a waveform of an output voltage of a second power supply provided in an embodiment of the present application, Figure 6 A waveform diagram of a target wake-up signal provided in an embodiment of the present application. Figure 5 As shown, the voltage signal input to the first end of the first switch tube, that is, the voltage of the second power supply output voltage signal remains stable and does not change. Figure 6 As shown, the target wake-up signal output by the second end of the first switch tube presents periodic, square wave characteristics. The peak of the target wake-up signal corresponds to the time period when the first switch tube is turned on, and the peak and valley of the target wake-up signal corresponds to the time period when the first switch tube is turned off. In this way, based on the level state of the first voltage signal, the conduction or cut-off of the first switch tube is controlled, and the output voltage of the unchanged second power supply is converted into a periodically changing target wake-up signal.

[0104] The embodiment of the present application provides a battery management system, which controls the on or off of the first switch tube through a first voltage signal, and further controls whether the output voltage of the second power supply is output to the back end. In this way, a periodic target wake-up signal can be output through the second end of the first switch tube, and the stability of the target wake-up signal is maintained.

[0105] In another embodiment of the present application, Figure 7 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 5 .like Figure 7 As shown, the charge and discharge module 103 includes an energy storage unit and a first discharge unit; wherein:

[0106] The first end of the first discharge unit is connected to the second end of the feedback unit, the output end of the comparator unit and the second end of the pull-up unit respectively, the second end of the first discharge unit is connected to the first end of the energy storage unit, and the second end of the energy storage unit is grounded;

[0107] The first terminal of the energy storage unit is also connected to the negative input terminal of the comparator unit, and is configured to provide the output voltage of the charge and discharge module 103 to the comparator unit.

[0108] In an embodiment of the present application, illustratively, the energy storage unit may include a first capacitor C1, and the first discharge unit may include a fifth resistor R5. The capacitance value of the first capacitor C1 and the resistance value of the fifth resistor R5 may be determined according to actual needs. By adjusting the capacitance value of the first capacitor C1, the duration of each cycle in the target wake-up signal may be changed; by adjusting the resistance value of the fifth resistor R5, the discharge duration of the first capacitor C1 may be changed, thereby changing the duty cycle of the target wake-up signal.

[0109] In the embodiment of the present application, when the charging and discharging module 103 is in different working modes, it has an impact on the level state of the target wake-up signal.

[0110] It should be noted that, when the charge-discharge module 103 is in the charging working mode, it includes two charging paths, one of which is for the first power supply V1 to charge the energy storage unit (first capacitor C1) via the first resistor unit (first resistor R1), the feedback unit (third resistor R3), and the first discharge unit (fifth resistor R5), and the other is for the fourth power supply V4 to charge the energy storage unit (first capacitor C1) via the fourth resistor and the first discharge unit (fifth resistor R5). When the charge-discharge module 103 is in the discharging working mode, the energy storage unit (first capacitor C1) can be discharged through the first discharge unit (fifth resistor R5), and a voltage signal can be output to the negative input terminal of the comparator unit.

[0111] In the embodiment of the present application, in the initial state after power-on, the input voltage of the positive terminal of the comparator unit is greater than the input voltage of the negative terminal, and the comparator unit outputs a first voltage signal in a high-impedance state. The control end (G pole) of the first switch tube Q1 is in a first level state through the pull-up unit, and the first switch tube Q1 is disconnected. At this time, the first capacitor C1 starts to charge, and the charge and discharge module 103 enters the charging working mode.

[0112] When the output voltage of the first capacitor C1 is charged to a value greater than a preset upper limit, the comparator unit outputs a first voltage signal in a second level state, so that the control end (G pole) of the first switch tube Q1 is in a second level state, and the first switch tube Q1 is turned on. At this time, the first capacitor C1 starts to discharge, and the charge and discharge module 103 enters a discharge working mode.

[0113] When the output voltage of the first capacitor C1 is discharged to be less than the preset lower limit value, the comparator unit outputs a first voltage signal in a first level state, so that the control end (G pole) of the first switch tube Q1 is in a first level state through the pull-up unit, and the first switch tube Q1 is disconnected. At this time, the first capacitor C1 starts to charge again, and the charge and discharge module 103 enters the charging working mode again.

[0114] In this way, the battery management system 10 continuously operates in a cycle, and the first capacitor C1 is cyclically charged and discharged, thereby outputting a target wake-up signal having a periodic, square wave characteristic.

[0115] The embodiment of the present application provides a battery management system, which periodically charges and discharges the energy storage unit, thereby changing the voltage signal input to the negative terminal of the comparator unit, and then outputting a target wake-up signal with a suitable cycle length. In addition, by setting a first discharge unit, the discharge speed of the energy storage unit can be adjusted, further changing the duty cycle of the target wake-up signal.

[0116] In some embodiments, Figure 8 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 6 .like Figure 8 As shown, the charge and discharge module 103 further includes a second discharge unit and a first diode D1; wherein:

[0117] A first end of the first diode D1 is connected to a first end of the first discharge unit, and a second end of the first diode D1 is connected to a first end of the second discharge unit;

[0118] The second end of the second discharge unit is connected to the first end of the energy storage unit.

[0119] In the embodiment of the present application, illustratively, the second discharge unit may include a sixth resistor R6 , and the sixth resistor R6 and the first diode D1 form a discharge branch of the first capacitor C1 .

[0120] Table 1

[0121]

[0122] In the embodiment of the present application, Table 1 is a work flow chart of the battery management system. First, in the initial state after power-on, the input voltage of the positive terminal of the comparator unit is greater than the input voltage of the negative terminal, the first voltage signal output by the comparator unit is in a high impedance state, the G pole of the first switch tube Q1 is in a first level state, the first switch tube Q1 is turned off, the target wake-up signal is in a second level state, and the second end of the first switch tube Q1 is not powered to the subsequent load. At this time, the first capacitor C1 is charged through two paths: the first power supply V1→the first resistor R1→the third resistor R3→the fifth resistor R5 and the fourth power supply V4→the fourth resistor R4→the fifth resistor R5.

[0123] When the voltage of the first capacitor C1 is charged to a preset upper limit value, the first voltage signal output by the comparator unit is in a second level state, the G pole of the first switch tube Q1 is in a second level state, the first switch tube Q1 is turned on, and the second end of the first switch tube Q1 supplies power to the subsequent load, and the first capacitor C1 is discharged through two paths: the first capacitor C1→the fifth resistor R5 and the first capacitor C1→the sixth resistor R6.

[0124] When the first capacitor C1 is discharged to the preset lower limit again, the first voltage signal output by the comparator unit is in a high impedance state, and the first capacitor C1 starts to charge again. In this way, the battery management system 10 keeps working in a cycle, and the first switch tube Q1 is turned on and off in a cycle, converting the output voltage of the second power supply V2 into a target wake-up signal.

[0125] It should be noted that, in the embodiment of the present application, the fifth resistor R5, the sixth resistor R6 and the first diode D1 affect the charge and discharge circuit of the first capacitor C1. Specifically, the discharge speed of the first capacitor C1 can be changed by adjusting the size of the fifth resistor R5 and the sixth resistor R6, thereby changing the duty cycle of the target wake-up signal. Among them, the first diode D1 can be used to make the branch where the sixth resistor R6 is located only for discharge.

[0126] In addition, in the embodiment of the present application, only one discharge path of the fifth resistor R5 can be set with reference to the above embodiment, or two discharge paths of the fifth resistor R5 and the sixth resistor R6 can be set with reference to the embodiment of the present application, which are specifically determined according to the waveform requirements of the target wake-up signal. It should be understood that if two discharge paths are set, the effect of full charging and fast discharge can be achieved, even if the peak duration of the target wake-up signal is shorter than the trough duration. Therefore, the charging time and discharge time of the first capacitor C1 can be changed by setting the resistance value of the fifth resistor R5 and the resistance value of the sixth resistor R6, thereby changing the duty cycle of the target wake-up signal.

[0127] It should also be noted that the first power supply V1, the second power supply V2, the third power supply V3 and the fourth power supply V4 may be the same power supply or different power supplies, depending on actual needs.

[0128] An embodiment of the present application provides a battery management system, which can make the charging time of the energy storage unit longer than the discharging time by setting a second discharge unit and a first diode, so as to output a target wake-up signal with a duty cycle that meets the requirements.

[0129] In yet another embodiment of the present application, Fig. 9 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 7 .like Fig. 9As shown, the battery management system 10 further includes a second diode D2, which is connected between the control module and the negative input terminal of the comparator unit; wherein:

[0130] The battery management system 10 is configured to continuously output a target wake-up signal in the first level state through the output module 104 when receiving an enable signal in the first level state sent by the control module.

[0131] In the aforementioned embodiment, the target wake-up signal is a signal that can periodically output a high level to the subsequent circuit, wherein the subsequent circuit may include a device that needs to be awakened periodically, such as the awakened module 106, and the device can work through the high level awakening that periodically appears in the target wake-up signal.

[0132] It should be understood that in some scenarios, the subsequent stage, such as the awakened module 106, may need to work continuously, that is, the target awakening signal needs to maintain a continuous high-level output. In this case, "controller enable" can be used as a reserved function, that is, the control module outputs an enable signal that maintains a high level to the comparator unit through the second diode D2, so that the comparator unit outputs the first voltage signal in the second level state, the first switch tube Q1 is turned on, and the target awakening signal maintains a high-level state and is output to the subsequent stage, so that the subsequent stage enters a continuous working mode.

[0133] It should be noted that, when the subsequent stage needs to be awakened periodically, the control module can keep the output enable signal at a low level. Due to the presence of the second diode D2, the enable signal output by the control module has no effect on the negative terminal of the comparator unit.

[0134] An embodiment of the present application provides a battery management system, which controls the target wake-up signal to maintain a high-level output state through an enable signal. In this way, the subsequent stage can continue to work when needed, thereby expanding the functions of the battery management system and improving the flexibility of the battery management system.

[0135] In another embodiment of the present application, Fig.10 A schematic diagram of the structure of a battery management system provided in an embodiment of the present application Figure 8 .like Fig.10 As shown, the battery management system 10 further includes a control module 105 and an awakened module 106; wherein:

[0136] The control module 105 is connected to the comparison module 102 and is configured to send an enable signal in a first level state to the comparison module 102;

[0137] The awakened module 106 is connected to the output end of the output module 104 , and is configured to receive a target awakening signal sent by the output module 104 to control the working state of the awakened module 106 .

[0138] In the embodiment of the present application, the awakened module 106 may be a module that needs to be awakened periodically to work, such as a sensor in a battery management system (BMS), or other devices.

[0139] In the embodiment of the present application, the comparator unit U1 and the resistors R1, R2, R3, and R4 form a hysteresis comparator. By adjusting the resistance value of the resistor, the preset upper limit value (high level flip threshold VOH) and the preset lower limit value (low level flip threshold VOL) ​​of the hysteresis comparator can be adjusted.

[0140] In addition, the charging and discharging of the first capacitor C1 affects the level state of the target wake-up signal output by the entire battery management system 10, and R5, R6, and the first diode D1 affect the charging and discharging loop where the first capacitor C1 is located.

[0141] In an embodiment of the present application, the first switch tube Q1 can use a transistor or a MOS tube. PMOS is taken as an example here. The first voltage signal output by the comparator unit controls the on and off states of the first switch tube Q1, thereby converting the output voltage of the second power supply V2 into a target wake-up signal.

[0142] The second diode D2 is an anti-reverse diode, which is used as a reserved function with "controller enable". When necessary, the control module 105 inputs a high level, and the target wake-up signal will maintain a continuous high level. For example, a periodic working signal is given to the thermal runaway sensor under normal circumstances. When a certain condition is triggered, a high level is input to "controller enable" to make the sensor enter a continuous working mode.

[0143] In the embodiment of the present application, the working process of the battery management system 10 includes:

[0144] First, in the initial state after power-on, the positive terminal voltage of the comparator unit U1 is greater than the negative terminal, the comparator unit outputs a high impedance state, the G pole of the first switch tube Q1 is at a high level, the first switch tube Q1 is disconnected, and the second end of the first switch tube Q1 does not supply power to the subsequent load, that is, the module 301 is awakened, and the first capacitor C1 starts to charge.

[0145] Next, when the voltage of the first capacitor C1 is charged to the preset upper limit value of the hysteresis comparator (high level flip threshold VOH), the first voltage signal output by the comparator unit is at a low level, the G pole of the first switch tube Q1 is at a low level, the first switch tube Q1 is turned on, and the second end of the first switch tube Q1 supplies power to the subsequent load, that is, the awakened module 301, and at this time the first capacitor C1 starts to discharge again.

[0146] Further, when the voltage of the first capacitor C1 is discharged to the preset lower limit value (low level flip threshold VOL) ​​of the hysteresis comparator, the comparator unit outputs a high level, the G pole of the first switch tube Q1 is a high level, the first switch tube Q1 is disconnected, and the second end of the first switch tube Q1 is not powered to the subsequent load, that is, the module 301 is awakened, and the first capacitor C1 starts to charge again.

[0147] In this way, the battery management system 10 keeps working in a cycle, and the first switch tube Q1 is turned on and off in a cycle, converting the power supply of the second power supply V2 into a pulse width modulation (PWM) type signal, that is, a target wake-up signal. The target wake-up signal can be directly used as the power supply of the back-end load, that is, the awakened module 301, or it can be used as a wake-up signal after being connected in series with a current limiting resistor.

[0148] The embodiment of the present application provides a battery management system with a simple circuit structure. It can output a periodic target wake-up signal to the awakened module without chip control. Moreover, the period duration of the output target wake-up signal is adjustable, which has high flexibility.

[0149] In yet another embodiment of the present application, Fig.11 The flowchart of a wake-up method provided in an embodiment of the present application is shown in FIG. The method can be applied to the battery management system in the aforementioned embodiment, such as Fig.11 As shown, the method may include:

[0150] S201, the comparison module compares the output voltage of the charge and discharge module with a preset threshold value, outputs a first voltage signal; and controls the working mode of the charge and discharge module according to the first voltage signal to increase or decrease the output voltage of the charge and discharge module.

[0151] S202: The output module generates a target wake-up signal according to the level state of the first voltage signal.

[0152] In some embodiments, for the above step S201, the comparison module compares the output voltage of the charge and discharge module with the preset threshold value, outputs a first voltage signal, and controls the working mode of the charge and discharge module according to the first voltage signal to increase or decrease the output voltage of the charge and discharge module, which may include:

[0153] When the output voltage of the charge and discharge module is less than the preset lower limit, the first voltage signal output by the comparison module is in a first level state, and the charge and discharge module is controlled to be in a charging mode to increase the output voltage of the charge and discharge module.

[0154] Alternatively, when the output voltage of the charge and discharge module is greater than a preset upper limit value, the first voltage signal output by the comparison module is in a second level state, and the charge and discharge module is controlled to be in a discharge mode to reduce the output voltage of the charge and discharge module.

[0155] In some embodiments, for the above step S202, the output module generates a target wake-up signal according to the level state of the first voltage signal, which may include:

[0156] When the first voltage signal is in a first level state, the first switch tube is turned off to generate a target wake-up signal in a second level state; or, when the first voltage signal is in a second level state, the first switch tube is turned on to generate a target wake-up signal in a first level state.

[0157] In some embodiments, the method may further include: upon receiving an enable signal in a first level state sent by the control module, the battery management system continuously outputs a target wake-up signal in a first level state through the output module.

[0158] In some embodiments, the method may further include:

[0159] The control module sends an enable signal in a first level state to the comparison module;

[0160] The awakened module receives the target awakening signal sent by the output module to control the working state of the awakened module.

[0161] An embodiment of the present application provides a wake-up method, in which a comparison module compares the output voltage of the charging and discharging module with a preset threshold value, outputs a first voltage signal, and further generates a target wake-up signal according to the level state of the first voltage signal. In this way, there is no need to set up an additional hardware timing chip, and based on the circuit structure including a power supply module, a comparison module, a charging and discharging module, and an output module, a target wake-up signal can be output. Moreover, due to the simple circuit structure, this circuit structure can also reduce the circuit cost. In addition, since the output of the target wake-up signal does not require the control of the hardware timing chip, the power consumption of the circuit is also reduced.

[0162] In another embodiment of the present application, Fig.12 A schematic diagram of the structure of a battery system provided in an embodiment of the present application. Fig.12 As shown, the battery system 30 includes a battery 301 and the battery management system 10 in the aforementioned embodiment.

[0163] In the embodiment of the present application, the battery 301 is connected to the battery management system 10 , and the battery 301 provides power to the battery management system 10 . The battery management system 10 is used to manage the timed output of power from the battery 301 .

[0164] In another embodiment of the present application, Fig.13 This is a schematic diagram of the structure of an electrical device provided in an embodiment of the present application. Fig.13 As shown, the electric device 40 includes the battery system 30 in the aforementioned embodiment.

[0165] In the embodiment of the present application, the power-consuming device 40 may be a device driven by a battery, which includes a battery system 30 and can perform a timed wake-up for the awakened module therein. For example, the power-consuming device 40 may be a new energy vehicle, a ship, an airplane, etc., for example, it may also be a power device such as an electric car, a hybrid car, an electric motorcycle, etc.

[0166] It should be understood that those skilled in the art should understand that the present application can be implemented in the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Moreover, the present application can be implemented in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program codes.

[0167] It should also be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the serial numbers of the above-mentioned steps / processes does not mean the order of execution, and the execution order of each step / process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are for description only and do not represent the advantages and disadvantages of the embodiments.

[0168] It should be noted that, in this application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0169] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0170] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in each embodiment of the present application, each functional unit may be fully integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0171] The above is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery management system, characterized in that: The battery management system includes a power supply module, a comparison module, a charge and discharge module and an output module, wherein the charge and discharge module includes an energy storage unit and a first discharge unit; the positive input terminal of the comparison module is connected to the power supply module, the negative input terminal of the comparison module is connected to the first terminal of the charge and discharge module, and the output terminal of the comparison module is connected to the second terminal of the charge and discharge module and the first terminal of the output module respectively; wherein: The comparison module is configured to compare the output voltage of the charge and discharge module with a preset threshold value and output a first voltage signal; when the first voltage signal is in a first level state, the charge and discharge module is controlled to be in a charging working mode, and the power supply module charges the energy storage unit to increase the output voltage of the charge and discharge module; or, when the first voltage signal is in a second level state, the charge and discharge module is controlled to be in a discharging working mode, and the energy storage unit is discharged through the first discharge unit to reduce the output voltage of the charge and discharge module; wherein the preset threshold value is determined according to the power supply module and the comparison module; The output module is configured to generate a target wake-up signal according to a level state of the first voltage signal.

2. The battery management system according to claim 1, characterized in that: The comparison module includes a comparator unit, a feedback unit and a pull-up unit, wherein: The positive input end of the comparator unit is connected to the power supply module, the negative input end of the comparator unit is connected to the first end of the charge and discharge module, and the output end of the comparator unit is connected to the second end of the charge and discharge module and the first end of the output module respectively; The feedback unit is connected between the positive input terminal of the comparator unit and the output terminal of the comparator unit, and the pull-up unit is connected to the output terminal of the comparator unit; The comparison module is configured to output a first voltage signal in a first level state when the output voltage of the charge and discharge module is less than a preset lower limit value; or to output a first voltage signal in a second level state when the output voltage of the charge and discharge module is greater than a preset upper limit value.

3. The battery management system according to claim 2, characterized in that: The power supply module includes a voltage dividing unit and a first power supply, and the voltage dividing unit includes a first resistance unit and a second resistance unit; wherein: The first end of the first resistor unit is connected to the first power supply, and the second end of the first resistor unit is connected to the positive input end of the comparator unit and the first end of the second resistor unit respectively; A second terminal of the second resistance unit is grounded.

4. The battery management system according to claim 2, characterized in that: The output module includes a first switch tube and a second power supply; wherein: The first end of the first switch tube is connected to the second power supply, and the control end of the first switch tube is connected to the output end of the comparison module and the first end of the charge and discharge module respectively; The first switch tube is configured to be turned off when the first voltage signal is in a first level state, so that the second end of the first switch tube outputs a target wake-up signal in a second level state, or to be turned on when the first voltage signal is in a second level state, so that the second end of the first switch tube outputs a target wake-up signal in a first level state.

5. The battery management system according to claim 2, characterized in that: The first end of the first discharge unit is connected to the second end of the feedback unit, the output end of the comparator unit and the second end of the pull-up unit respectively, the second end of the first discharge unit is connected to the first end of the energy storage unit, and the second end of the energy storage unit is grounded; The first end of the energy storage unit is also connected to the negative input end of the comparator unit, and is configured to provide the output voltage of the charge and discharge module to the comparator unit.

6. The battery management system according to claim 5, characterized in that: The charging and discharging module further includes a second discharge unit and a first diode; wherein: A first end of the first diode is connected to a first end of the first discharge unit, and a second end of the first diode is connected to a first end of the second discharge unit; The second end of the second discharge unit is connected to the first end of the energy storage unit.

7. The battery management system according to any one of claims 2 to 6, characterized in that: The battery management system further includes a second diode connected between the control module and the negative input terminal of the comparator unit; wherein: The battery management system is configured to continuously output a target wake-up signal in the first level state through the output module when receiving an enable signal in the first level state sent by the control module.

8. The battery management system according to any one of claims 2 to 6, characterized in that: The battery management system also includes a control module and an awakened module; wherein: The control module is connected to the comparison module and is configured to send an enable signal in a first level state to the comparison module; The awakened module is connected to the output end of the output module, and is configured to receive a target awakening signal sent by the output module to control the working state of the awakened module.

9. A wake-up method, characterized in that: Applied to a battery management system according to any one of claims 1 to 8, the method comprising: The comparison module compares the output voltage of the charge and discharge module with a preset threshold value and outputs a first voltage signal; when the first voltage signal is in a first level state, the charge and discharge module is controlled to be in a charging working mode, and the power supply module charges the energy storage unit to increase the output voltage of the charge and discharge module; or, when the first voltage signal is in a second level state, the charge and discharge module is controlled to be in a discharging working mode, and the energy storage unit is discharged through the first discharge unit to reduce the output voltage of the charge and discharge module; wherein the preset threshold value is determined according to the power supply module and the comparison module; The output module generates a target wake-up signal according to the level state of the first voltage signal.

10. The wake-up method according to claim 9, characterized in that: The comparison module compares the output voltage of the charge and discharge module with a preset threshold value and outputs a first voltage signal; and controls the working mode of the charge and discharge module according to the first voltage signal so that the output voltage of the charge and discharge module increases or decreases, including: When the output voltage of the charge and discharge module is less than a preset lower limit value, the first voltage signal output by the comparison module is in a first level state, and the charge and discharge module is controlled to be in a charging mode, so that the output voltage of the charge and discharge module increases; When the output voltage of the charge and discharge module is greater than a preset upper limit value, the first voltage signal output by the comparison module is in a second level state, and the charge and discharge module is controlled to be in a discharge mode to reduce the output voltage of the charge and discharge module.

11. The wake-up method according to claim 9 or 10, characterized in that: The output module generates a target wake-up signal according to the level state of the first voltage signal, including: When the first voltage signal is in a first level state, the first switch tube is turned off to generate a target wake-up signal in a second level state; or, when the first voltage signal is in a second level state, the first switch tube is turned on to generate a target wake-up signal in a first level state.

12. A battery system, characterized in that: The battery system comprises a battery and a battery management system according to any one of claims 1 to 8.

13. An electrical device, characterized in that: The electric device comprises the battery system as claimed in claim 12.

Images