Battery management system wake-up circuit, battery management system, battery system and equipment

Abstract

The utility model provides a battery management system wake-up circuit, a battery management system, a battery system and equipment. The battery management system wake-up circuit comprises a load wake-up sub-circuit, and the load wake-up sub-circuit comprises a load wake-up switch module and a load wake-up signal output module. A first end of the load wake-up switch module is connected with a first end of a first switch module of a power supply loop of the battery system, a second end of the load wake-up switch module is connected with a second end of the first switch module, and a third end of the load wake-up switch module is connected with the load wake-up signal output module. The fourth end of the load wake-up switch module is connected with a power supply control module of the battery management system; when the power supply loop is connected to a load, the load awakening signal awakens the power supply control module to control the power supply module to supply power to the power utilization module. The battery management system wake-up circuit can wake up the power supply control module to control the power supply module to supply power to the power utilization module when the load is connected to the power supply loop.

Description

Technical Field

[0001] The present application relates to a battery management system wake-up circuit, and in particular to a battery management system wake-up circuit, a battery management system, a battery system and a device. Background Art

[0002] The Battery Management System (BMS) can manage, control and use batteries, improve battery utilization, and prevent overcharging and over-discharging. The performance of the BMS determines the service life of the battery and plays a vital role in the safe and reliable operation of electronic devices, such as eVTOL flying cars, electric vehicles and other battery-driven devices.

[0003] When BMS is not used for a long time, it will enter a dormant state. At present, there are usually the following ways to wake up BMS: key wake-up, vehicle controller wake-up, charging wake-up, etc. The current wake-up method does not meet the user's BMS wake-up needs. Utility Model Content

[0004] The present application provides a battery management system wake-up circuit, a battery management system, a battery system and a device, so as to solve the problem that the current BMS wake-up method does not meet the BMS wake-up requirements of users.

[0005] In a first aspect, the present application provides a battery management system wake-up circuit, the battery management system wake-up circuit comprising: a load wake-up sub-circuit, the load wake-up sub-circuit comprising: a load wake-up switch module, a load wake-up signal output module;

[0006] The first end of the load wake-up switch module is connected to the first end of the first switch module of the power supply circuit of the battery system, the second end of the load wake-up switch module is connected to the second end of the first switch module, the third end of the load wake-up switch module is connected to the load wake-up signal output module, and the fourth end of the load wake-up switch module is connected to the power supply control module of the battery management system;

[0007] When the power supply circuit is connected to a load, the load wake-up switch module is turned on, so that the load wake-up signal output module outputs a wake-up signal to the power supply control module, and the wake-up signal is used to wake up the power supply control module to control the power supply module to supply power to the power-consuming module.

[0008] Optionally, the load wake-up switch module includes: a first switch sub-module; the third end of the first switch sub-module is the third end of the load wake-up switch module, and the fourth end of the first switch sub-module is the fourth end of the load wake-up switch module.

[0009] Optionally, the load wake-up switch module further includes: a first current limiting submodule and / or a second current limiting submodule;

[0010] The first end of the first current limiting submodule is the first end of the load wake-up switch module, and the second end of the first current limiting submodule is connected to the first end of the first switch submodule;

[0011] The first end of the second current limiting submodule is the second end of the load wake-up switch module, and the second end of the second current limiting submodule is connected to the second end of the first switch submodule.

[0012] Optionally, the load wake-up switch module further includes: an overvoltage protection submodule; the overvoltage protection submodule is located between the first end and the second end of the first switch submodule.

[0013] Optionally, the load wake-up switch module further includes: a first unidirectional conduction submodule; the first unidirectional conduction submodule is located at the second end of the first switch submodule.

[0014] Optionally, the power supply circuit further includes a second switch module, and the second switch module is connected in series with the first switch module in the power supply circuit;

[0015] The first switch module is located at the positive side of the power supply circuit, and the second switch module is located at the negative side of the power supply circuit; or the second switch module is located at the positive side of the power supply circuit, and the first switch module is located at the negative side of the power supply circuit.

[0016] Optionally, the load wake-up subcircuit also includes: a load module; the first end of the load module is connected to the first end of the second switch module, and the second end of the load module is connected to the second end of the second switch module; the wake-up signal is also used to wake up the battery management system to turn on the second switch module so that the power supply circuit powers the load.

[0017] Optionally, the load module includes: a load submodule; the first end of the load submodule is the first end of the load module; and / or, a second unidirectional conducting submodule; the first end of the second unidirectional conducting submodule is the second end of the load module, and the second end of the second unidirectional conducting submodule is connected to the second end of the load submodule.

[0018] In a second aspect, the present application provides a battery management system, the battery management system comprising a battery management system wake-up circuit, a power supply control module, a power supply module, and a power consumption module as described in any one of the first aspects;

[0019] The power supply control module is used to send an enable signal to the power supply module in response to a wake-up signal sent by the wake-up subcircuit of the battery management system wake-up circuit;

[0020] The power supply module is used to supply power to the power-consuming module in response to the enable signal, so as to wake up the power-consuming module.

[0021] Optionally, the power consumption module includes a control module;

[0022] The control module is used to send a self-holding enable signal to the power supply control module after waking up;

[0023] The power supply control module is used to send the enable signal to the power supply module in response to the self-holding enable signal.

[0024] In a third aspect, the present application provides a battery system, comprising: a power supply circuit, and a battery management system as described in any one of the second aspects.

[0025] In a fourth aspect, the present application provides an electronic device, comprising: a battery system as described in the third aspect.

[0026] The battery management system wake-up circuit, battery management system, battery system and equipment provided in the present application can output a wake-up signal to the power supply control module of the battery management system when the load is connected to the power supply circuit of the battery system, thereby waking up the power supply control module to control the power supply module to supply power to the power-consuming module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0028] Figure 1 A structural diagram of a BMS wake-up circuit provided by the prior art;

[0029] Figure 2 A schematic diagram of the structure of the first BMS wake-up circuit provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the structure of a load wake-up switch module provided in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of the structure of a second BMS wake-up circuit provided in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of the structure of a third BMS wake-up circuit provided in an embodiment of the present application;

[0033] Figure 6 A schematic diagram of the structure of a battery system provided in an embodiment of the present application.

[0034] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0035] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0036] The Battery Management System (BMS) can manage, control and use batteries, improve battery utilization, and prevent overcharging and over-discharging. The performance of the BMS determines the service life of the battery and plays a vital role in the safe and reliable operation of electronic devices, such as eVTOL flying cars, electric vehicles and other battery-driven devices.

[0037] The BMS itself also consumes power. If it is always turned on, it will consume the energy stored in the battery. Therefore, when the BMS is not used for a long time, it will enter a dormant state. When the BMS needs to be used, the BMS can be awakened by a wake-up signal to restore the BMS from the dormant state to the normal working state. At present, there are usually the following ways to wake up the BMS:

[0038] (I) Key wake-up, also known as KL15 wake-up. KL15 represents the engine ignition signal. One end of KL15 is connected to the vehicle power supply and the other end is connected to the BMS. Before the engine is ignited, the KL15 switch is disconnected, there is no signal input, and the BMS controller does not work; after the engine is ignited, the KL15 switch is closed to provide working power to the BMS controller, thereby waking up the BMS.

[0039] (ii) Vehicle Control Unit (VCU) wake-up. The VCU can wake up the BMS by sending a wake-up signal or a wake-up command to the BMS through the vehicle's internal communication bus. After the BMS is awakened, it can monitor the battery status, manage the charging and discharging process, etc.

[0040] (III) Charging wake-up, also known as plug-in wake-up. The plug-in wake-up signal can be a resistance signal. When the BMS wake-up circuit detects the specified resistance value, it means that the charging circuit has been connected and charging can be performed, thereby waking up the BMS.

[0041] Figure 1 The following is a schematic diagram of a BMS wake-up circuit provided by the prior art. Figure 1 As shown, the above three wake-up signals are connected to the enable end of the DC to DC converter (DCDC) through an OR gate (Or gate, OR). When the OR gate receives any wake-up signal, it sends an enable signal EN to the DCDC. When the DCDC receives the enable signal EN, it provides working power, such as 3.3V, 5V, etc., to each functional block and microcontroller unit (MCU) of the BMS. Any of the above three wake-up signals can wake up the BMS. The MCU can also output a self-holding enable signal EN according to a preset rule. The self-holding enable signal EN is connected to the OR gate, and the BMS can be kept in a wake-up state through the self-holding enable signal EN when the above three wake-up signals disappear.

[0042] The above BMS wake-up method does not meet the BMS wake-up requirements of users.

[0043] In view of this, the present application proposes a BMS wake-up circuit, which sends a wake-up signal to the BMS when the load is connected to the power supply circuit, thereby waking up the BMS.

[0044] The BMS wake-up circuit proposed in the present application is suitable for electric vertical take-off and landing (eVTOL) flying cars, and can also be used in any power supply circuit that uses BMS for power supply management other than eVTOL flying cars. When the BMS is in a sleep state, the BMS can be woken up when any load is connected to the power supply circuit.

[0045] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0046] The application scenarios of using a BMS for power supply management that may be involved in the embodiments of the present application may be, for example, any of the following:

[0047] (i) A power supply circuit using a BMS for power supply management may include: a battery pack, a first switch module, and a load. The first switch module may be located on the positive side of the power supply circuit or on the negative side of the power supply circuit. The BMS wake-up circuit may be connected in parallel with the first switch module, that is, the first end of the BMS wake-up circuit is connected to the first end of the first switch module, and the second end of the BMS wake-up circuit is connected to the second end of the first switch module.

[0048] The load can be any load that can be connected to the battery pack, for example, it can include any of the following: audio, lighting, air conditioning, etc. The load can be connected to the battery pack in any manner, such as a physical switch, an electronic switch, a wiring terminal, etc. The first switch module can be any switch tube that can be turned on or off based on a high level or low level signal, such as a relay, or an insulated gate bipolar transistor (IGBT), or a metal-oxide-semiconductor field effect transistor (MOS), or a triode. When the load is connected to the battery pack, a power supply circuit can be formed between the positive and negative electrodes of the battery pack.

[0049] (ii) A power supply circuit using a BMS for power supply management may include: a battery pack, a first switch module, a second switch module, and a load. The first switch module may be located on the positive side of the power supply circuit, and the second switch module may be located on the negative side of the power supply circuit, or the second switch module may be located on the positive side of the power supply circuit, and the first switch module may be located on the negative side of the power supply circuit; the load is located between the first switch module and the second switch module. A first end of the BMS wake-up circuit is connected to a first end of the first switch module, a second end of the BMS wake-up circuit is connected to a second end of the first switch module, a third end of the BMS wake-up circuit is connected to a first end of the second switch module, and a fourth end of the BMS wake-up circuit is connected to a second end of the second switch module.

[0050] The second switch module can be any switch tube that can be turned on or off based on a high level or low level signal, for example, a relay, or an insulated gate bipolar transistor (IGBT), or a metal-oxide-semiconductor field effect transistor (MOS), or a triode. The first switch module and the second switch module can be different or the same, for example, the first switch module uses a relay and the second switch module uses a MOS tube, or the first switch module and the second switch module are both relays, which is not limited in the embodiments of the present application.

[0051] The structure of the BMS wake-up circuit is illustrated below in an application scenario corresponding to a power supply circuit including a battery pack, a first switch module, and a load.

[0052] Figure 2 This is a schematic diagram of the structure of the first BMS wake-up circuit provided in the embodiment of the present application. Figure 2 As shown, the BMS wake-up circuit includes: a load wake-up sub-circuit, and the load wake-up sub-circuit may include: a load wake-up switch module and a load wake-up signal output module.

[0053] The first end of the load wake-up switch module is connected to the first end of the first switch module of the power supply circuit, the second end of the load wake-up switch module is connected to the second end of the first switch module, the third end of the load wake-up switch module is connected to the load wake-up signal output module, and the fourth end of the load wake-up switch module is connected to the power supply control module of the BMS.

[0054] The load wake-up switch module may be any module that enables the output load wake-up signal module to output a wake-up signal to the power supply control module of the BMS when the power supply circuit is connected to the load.

[0055] The load wake-up signal output module can be any module that outputs a high-level signal. For example, it can be any one of an AC-DC converter, a DC power supply, a DC-DC converter, a battery, an energy storage capacitor, and the like. The load wake-up signal output module can be directly connected to the third end of the load wake-up switch module, or the load wake-up signal output module is connected to the third end of the load wake-up switch module through a third unidirectional conduction submodule. The third unidirectional conduction submodule can be a part of the load wake-up signal output module, or it can be a part independent of the load wake-up signal output module, which is not limited in the embodiments of the present application.

[0056] The power supply module may be, for example, a module that performs voltage conversion on the input power supply under the control of the power supply control module, for example, a DCDC. Figure 2 Not shown.

[0057] The power supply control module may be any module that can respond to the wake-up signal and control the power supply module to supply power to the power-consuming module. The power-consuming module may be, for example, each functional module of the BMS, a control module MCU of the BMS, and the like.

[0058] When the power supply circuit of the battery system is connected to the load, the load wake-up switch module is turned on, and the load wake-up signal output module outputs a wake-up signal to the power supply control module. The wake-up signal can be used to wake up the power supply control module to control the power supply module to supply power to the power consumption module.

[0059] It should be understood that the wake-up signal may be a high level or a low level, which is specifically related to the wake-up level of the BMS supported by the hardware entity.

[0060] It should be understood that the BMS wake-up circuit in the embodiment of the present application may be a part of the BMS or a circuit independent of the BMS, which is not limited in the embodiment of the present application.

[0061] To sum up, the BMS wake-up circuit provided in the embodiment of the present application, by setting a load wake-up sub-circuit, can output a wake-up signal to the power supply control module of the BMS when the load is connected to the power supply circuit of the battery system, thereby waking up the power supply control module to control the power supply module to supply power to the power-consuming module.

[0062] Below Figure 2 The structure of the load wake-up switch module in the example is illustrated as an example.

[0063] Figure 3 This is a schematic diagram of the structure of a load wake-up switch module provided in an embodiment of the present application. Figure 3 As shown, the load wake-up switch module may include: a first switch submodule.

[0064] The third end of the first switch submodule is the third end of the load awakening switch module, and the fourth end of the first switch submodule is the fourth end of the load awakening switch module.

[0065] The first switch submodule may be any device that enables the output load wake-up signal module to output a wake-up signal to the power supply control module of the BMS when the power supply circuit is connected to the load. For example, the first switch submodule may be any one of: a photocoupler, a relay, and the like.

[0066] When the power supply circuit is connected to the load, the first switch submodule is turned on, and the load wake-up signal output module outputs a wake-up signal to the power supply control module of the BMS, thereby waking up the BMS.

[0067] The load wake-up switch module may further include a first current limiting submodule and / or a second current limiting submodule.

[0068] The first end of the first current limiting submodule is the first end of the load awakening switch module, and the second end of the first current limiting submodule is connected to the first end of the first switch submodule.

[0069] The first end of the second current limiting submodule is the second end of the load awakening switch module, and the second end of the second current limiting submodule is connected to the second end of the first switch submodule.

[0070] The first current limiting submodule may be any module that can limit the current flowing through the first switch submodule. For example, it may include at least one first resistor, and the second current limiting submodule may be any module that can limit the current flowing through the first switch submodule. For example, it may include at least one second resistor. For example, the first resistors may be connected in series or in parallel to form the resistance value of the first current limiting submodule. The second resistors may be connected in series or in parallel to form the resistance value of the second current limiting submodule.

[0071] When the power supply circuit is connected to the load, the battery pack and the first current limiting submodule and / or the second current limiting submodule can limit the current flowing through the first switch submodule to avoid excessive current flowing through the first switch submodule and damaging the first switch submodule.

[0072] The load wake-up switch module may further include: an overvoltage protection submodule. The overvoltage protection submodule is located between the first end and the second end of the first switch submodule. The overvoltage protection submodule may be any submodule having a voltage stabilization function, such as a voltage stabilizing diode, a voltage stabilizing transistor, an integrated voltage stabilizer, etc.

[0073] When a voltage exceeding the normal power supply of the battery pack appears in the circuit, the overvoltage protection submodule can reduce the voltage fluctuation between the first end and the second end of the first switch submodule to prevent the first switch submodule from being damaged by the high voltage.

[0074] The load wake-up switch module may further include: a first unidirectional conduction submodule. The first unidirectional conduction submodule is located at the second end of the first switch submodule.

[0075] The first unidirectional conducting submodule can be any submodule that can be turned on based on a forward voltage and cut off based on a reverse voltage, for example, it can be a diode, or it can be a series connection of multiple diodes. When the battery pack provides a forward voltage to the first unidirectional conducting submodule, for example, when the first unidirectional conducting submodule is a diode, the positive electrode of the battery pack is connected to the positive electrode of the diode, and the negative electrode of the battery pack is connected to the negative electrode of the diode, the first unidirectional conducting submodule is turned on, and the power supply connection between the first switch submodule and the battery pack is normal. On the contrary, if the positive and negative poles of the battery pack are reversed, that is, the positive pole of the battery pack is connected to the negative pole of the diode, and the negative pole of the battery pack is connected to the positive pole of the diode, the first unidirectional conducting submodule is cut off, and the power supply connection between the first switch submodule and the battery pack is disconnected. The first unidirectional conducting submodule is used to keep the circuit unidirectionally energized, which can avoid damage to the first switch submodule when the positive and negative poles of the battery pack are reversed.

[0076] Furthermore, the wake-up signal can also wake up the BMS to manage the power supply to the load. For example, when the battery pack has sufficient power, the BMS can supply power to the load by controlling the first switch module to close. Alternatively, when the battery pack has insufficient power, the BMS can stop supplying power to the load by controlling the first switch module to open.

[0077] The structure of the BMS wake-up circuit is illustrated below in an application scenario corresponding to a power supply circuit including a battery pack, a first switch module, a second switch module, and a load.

[0078] Figure 4 This is a schematic diagram of the structure of the second BMS wake-up circuit provided in the embodiment of the present application. Figure 4 As shown, the power supply circuit may further include a second switch module, and the second switch module is connected in series with the first switch module in the power supply circuit.

[0079] The first switch module is located at the positive side of the power supply circuit, and the second switch module is located at the negative side of the power supply circuit; or the second switch module is located at the positive side of the power supply circuit, and the first switch module is located at the negative side of the power supply circuit. Figure 4 The following is a schematic illustration using an example in which the first switch module is located at the positive side of the power supply circuit and the second switch module is located at the negative side of the power supply circuit.

[0080] The load awakening subcircuit may further include: a load module, wherein a first end of the load module is connected to a first end of the second switch module, and a second end of the load module is connected to a second end of the second switch module.

[0081] The load module may be any module that can form a power supply loop with the load, for example, it may be any one of: a diode, a resistor, etc.

[0082] The load module may include: a load submodule; the first end of the load submodule is the first end of the load module. The load submodule may include at least one third resistor. For example, the third resistors may be connected in series or in parallel to form the resistance of the load submodule. When the load submodule is included in the load wake-up subcircuit, the resistance of the load submodule and / or the resistance of the first current limiting submodule and / or the resistance of the second current limiting submodule may be reasonably set according to the voltage of the battery pack in the power supply circuit. When the power supply circuit is connected to the load, the current flowing through the first switch submodule is within the working range, so that the first switch submodule can be turned on, and the first switch submodule can be prevented from being damaged due to excessive current.

[0083] The load module may further include: a second unidirectional conducting submodule; a first end of the second unidirectional conducting submodule is the second end of the load module, and a second end of the second unidirectional conducting submodule is connected to the second end of the load submodule.

[0084] The second unidirectional conduction submodule can be any submodule that can be turned on based on the forward voltage and cut off based on the reverse voltage, for example, it can be a diode, or it can be a series connection of multiple diodes. When the battery pack provides a forward voltage to the second unidirectional conduction submodule, for example, when the second unidirectional conduction submodule is a diode, the positive electrode of the battery pack is connected to the positive electrode of the diode, and the negative electrode of the battery pack is connected to the negative electrode of the diode, the second unidirectional conduction submodule is turned on, and the power supply connection between the first switch submodule and the battery pack works normally. On the contrary, if the positive and negative poles of the battery pack are reversed, that is, the positive pole of the battery pack is connected to the negative pole of the diode, and the negative pole of the battery pack is connected to the positive pole of the diode, the second unidirectional conduction submodule is cut off, and the power supply connection between the first switch submodule and the battery pack is disconnected. The second unidirectional conduction submodule is used to keep the circuit unidirectionally energized, which can avoid damage to the first switch submodule when the positive and negative poles of the battery pack are reversed.

[0085] When the power supply circuit is connected to the load, the first switch submodule is turned on, and the load wake-up signal output module outputs a wake-up signal to the power supply control module of the BMS. The wake-up signal is used to wake up the power supply control module to control the power supply module to supply power to the power consumption module.

[0086] In summary, the BMS wake-up circuit can output a wake-up signal to the power supply control module of the BMS when the load is connected to the power supply circuit, thereby waking up the power supply control module to control the power supply module to supply power to the power consumption module.

[0087] Furthermore, the wake-up signal can also wake up the BMS to manage the power supply to the load. For example, when the battery pack has sufficient power, the BMS can supply power to the load by controlling the first switch module and the second switch module to be closed. Alternatively, when the battery pack has insufficient power, the BMS can stop supplying power to the load by controlling the first switch module and the second switch module to be disconnected.

[0088] In addition to waking up the BMS when the load is connected to the power supply circuit, the BMS wake-up circuit can also wake up the BMS through other wake-up methods. The following describes the possible wake-up methods of the BMS.

[0089] Figure 5 This is a schematic diagram of the structure of the third BMS wake-up circuit provided in the embodiment of the present application. Figure 5 As shown, the BMS wake-up circuit includes: at least two wake-up sub-circuits; each wake-up sub-circuit is connected to the power supply control module of the BMS, and the power supply control module of the BMS is also connected to the power supply module of the power consumption module of the BMS; the at least two wake-up sub-circuits include at least a load wake-up sub-circuit.

[0090] When the power supply circuit of the battery system is connected to the load, the load awakening subcircuit outputs an awakening signal to the power supply control module of the BMS, and the awakening signal is used to awaken the power supply control module to control the power supply module to supply power to the power consumption module. The specific implementation method can be referred to the above implementation method, which will not be repeated here.

[0091] In addition to the load wake-up subcircuit, the BMS wake-up circuit may also include a wake-up subcircuit, which is specifically related to the way of waking up the BMS supported by the hardware entity. For example, taking an electric vehicle as an example, the wake-up subcircuit may also include at least one of the following: a key wake-up subcircuit, a control module wake-up subcircuit, a charging wake-up subcircuit, etc. Figure 5 In the example shown, the BMS wake-up circuit includes four wake-up sub-circuits, namely, a load wake-up sub-circuit, a key wake-up sub-circuit, a control module wake-up sub-circuit, and a charging wake-up sub-circuit.

[0092] The four wake-up sub-circuits are all connected to the power supply control module. The power supply control module can be a logic gate, and the type of the logic gate can be determined by the level of the wake-up signal and the wake-up level of the BMS supported by the hardware entity. For example, when the wake-up level of the BMS supported by the hardware entity is high and the wake-up signal is a high-level signal, the power supply control module can be an OR gate; when the wake-up level of the BMS supported by the hardware entity is high and the wake-up signal is low, the power supply control module can be a NAND gate; when the wake-up level of the BMS supported by the hardware entity is low and the wake-up signal is low, the power supply control module can be an AND gate. It should be set according to the actual situation.

[0093] When the power supply circuit includes a battery pack, a first switch module, and a load, the BMS can manage the power supply to the load by controlling the first switch module to close or open. When the power supply circuit includes a battery pack, a first switch module, a second switch module, and a load, the BMS can manage the power supply to the load by controlling the first switch module and the second switch module to close or open.

[0094] The key wake-up subcircuit can respond to the ignition command and send a wake-up signal to the power supply control module of the BMS. The wake-up signal is used to wake up the BMS. For example, the user can trigger the ignition command by turning the car key or by pressing the one-touch start button. The wake-up signal can be a high-level signal or a low-level signal.

[0095] The control module wake-up subcircuit may be, for example, a subcircuit that uses the VCU to wake up the BMS. The control module wake-up subcircuit may send a wake-up signal to the power supply control module of the BMS, and the wake-up signal is used to wake up the BMS to manage the power supply of the power supply module. The control module wake-up subcircuit may be any subcircuit that can output a high-level or low-level control signal, and may include, for example, any processing unit such as a single-chip microcomputer, an embedded processor, or a programmable logic device. Optionally, in addition to the processing unit, a peripheral circuit unit of the processing unit may also be included. The control module wake-up subcircuit may set a rule for sending a wake-up signal, and the control module wake-up subcircuit may send a wake-up signal to the BMS according to the preset rule, and the wake-up signal may be a high-level signal or a low-level signal.

[0096] The charging wake-up subcircuit can send a wake-up signal to the power supply control module of the BMS when the power supply module of the power supply circuit enters the charging state. The wake-up signal can be used to wake up the BMS to manage the charging of the power supply module. For example, the power supply module can enter the charging state when it is connected to an external input power supply. The external input power supply can be a DC power supply or an AC power supply, which is related to the way the charging circuit is connected to the power supply module. For example, the user can connect the vehicle's power supply module to an external input power supply by connecting the charging gun of the charging pile to the vehicle. The wake-up signal can be a high-level signal or a low-level signal.

[0097] Figure 5 Taking the case where the wake-up signals sent by the four wake-up sub-circuits are all high-level signals and the power supply control module is an OR gate as an example, the wake-up signals sent by the four wake-up sub-circuits are connected to the enable end of the power supply module DCDC through the OR gate. When the OR gate receives any wake-up signal, it sends an enable signal EN to DCDC. When DCDC receives the enable signal EN, it provides working power, such as 3.3V, 5V, etc., to each functional block of the BMS and the control module MCU. The wake-up signal sent by any of the four wake-up sub-circuits can wake up the BMS. The MCU can also output a self-holding enable signal EN according to preset rules. The self-holding enable signal EN is connected to the OR gate. When the wake-up signals sent by the four wake-up sub-circuits disappear, the BMS can be kept in the wake-up state through the self-holding enable signal EN.

[0098] In summary, the BMS wake-up circuit can wake up the BMS to manage the power supply to the load through the load wake-up sub-circuit; and wake up the BMS to manage the power supply to the power supply module through any wake-up sub-circuit such as the key wake-up sub-circuit, the control module wake-up sub-circuit, and the charging wake-up sub-circuit.

[0099] The following uses the first switch submodule as an example of a photoelectric coupler, and the corresponding power supply circuit includes a battery pack, a first switch module, a second switch module, and an application scenario of a load to illustrate how to wake up the BMS in the embodiment of the present application. Among them, the first switch module can be a main positive relay, and the second switch module can be a main negative relay. The main positive relay is used to connect the positive electrode of the battery pack to the load, and the main and auxiliary relays are used to connect the negative electrode of the battery pack to the load.

[0100] Figure 6 This is a schematic diagram of the structure of a battery system provided in an embodiment of the present application. Figure 6 As shown, the battery system may include: a power supply circuit, a BMS wake-up circuit, a power supply control module, a power supply module and a power consumption module.

[0101] In the BMS wake-up circuit, the first switch submodule includes: a photoelectric coupler U1; the photoelectric coupler U1 includes: pin ①, pin ②, pin ③, pin ④; the first current limiting submodule includes: resistor R1, resistor R2; the second current limiting submodule includes: resistor R3; the overvoltage protection submodule includes: a voltage regulator diode D3; the first unidirectional conduction submodule includes: a diode D1; the load submodule includes: a resistor R4, a resistor R5; the second unidirectional conduction submodule includes: a diode D2; the load wake-up signal output module includes: a power supply VCC; the third unidirectional conduction submodule includes: a diode D4.

[0102] The first end of the resistor R1 is connected to the first end of the main positive relay, the second end of the resistor R1 is connected to the first end of the resistor R2, the second end of the resistor R2 is connected to the first end (pin ①) of the photoelectric coupler U1, the first end (negative electrode) of the diode D1 is connected to the second end of the main positive relay, the second end (positive electrode) of the diode D1 is connected to the first end of the resistor R3, the second end of the resistor R3 is connected to the second end (pin ②) of the photoelectric coupler U1, the first end (negative electrode) of the Zener diode D3 is connected to the first end of the resistor R2, and the second end (positive electrode) of the Zener diode D3 is connected to the second end (pin ②) of the photoelectric coupler U1;

[0103] The third end (pin ④) of the photocoupler U1 is connected to the first end (cathode) of the diode D4, and the second end (anode) of the diode D4 is connected to the power supply VCC. The fourth end (pin ③) of the photocoupler U1 is connected to the BMS.

[0104] The first end of resistor R4 is connected to the first end of the main negative relay, the second end of resistor R4 is connected to the first end of resistor R5, the first end (negative pole) of diode D2 is connected to the second end of the main negative relay, and the second end (positive pole) of diode D2 is connected to the second end of resistor R5.

[0105] Diode D1 and diode D2 are used to keep the circuit unidirectionally powered, which can prevent the first switch submodule from being damaged when the positive and negative poles of the battery pack are connected in reverse. Diode D4 is used to keep the circuit unidirectionally powered, and can be turned on when the power supply VCC provides a high-level signal, and turned off when the power supply VCC provides a low-level signal.

[0106] The photocoupler U1 includes a light emitting diode and a phototransistor. The first end (pin ①) of the photocoupler U1 is the positive electrode of the light emitting diode, the second end (pin ②) of the photocoupler U1 is the negative electrode of the light emitting diode, the fourth end (pin ③) of the photocoupler U1 is the emitter of the phototransistor, and the third end (pin ④) of the photocoupler U1 is the collector of the phototransistor.

[0107] In a specific implementation, the specifications of the resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, photoelectric coupler U1, diode D1, diode D2, and Zener diode D3 can be selected based on the voltage of the battery pack, so that the light-emitting diode of the photoelectric coupler U1 can be turned on when the load is connected to the power supply circuit to output a wake-up signal.

[0108] The following describes how the load wake-up sub-circuit uses this structure to output a wake-up signal.

[0109] When the load is connected to the power supply circuit, the voltage at the first end (pin ①) of the photocoupler U1 is greater than the voltage at the second end (pin ②) of the photocoupler U1. At this time, the light-emitting diode of the photocoupler U1 is turned on, causing the light-emitting diode to emit light. After the phototransistor of the photocoupler U1 receives the light emitted by the light-emitting diode, the phototransistor is turned on. After the phototransistor is turned on, the power supply VCC, the diode D4 and the emitter of the phototransistor are connected, and the emitter of the phototransistor outputs a high-level signal, that is, a wake-up signal.

[0110] It should be understood that when the load is not connected to the power supply circuit, there is no voltage at the first end (pin ①) of the photocoupler U1 and the second end (pin ②) of the photocoupler U1. At this time, the light-emitting diode of the photocoupler U1 will not be turned on, and the light-emitting diode will not emit light. At this time, the phototransistor is in the cut-off state. There is no conduction between the power supply VCC, the diode D4 and the emitter of the phototransistor, and the emitter of the phototransistor stops outputting a high-level signal, that is, stops outputting a wake-up signal.

[0111] When the cathode voltage and anode voltage of the Zener diode D3 are less than the breakdown voltage of the Zener diode D3, the Zener diode D3 does not work. When the cathode voltage and anode voltage of the Zener diode D3 are greater than the breakdown voltage of the Zener diode D3, the Zener diode D3 reversely breaks down, and the cathode and anode voltages thereof are maintained at the stabilization voltage value of the Zener diode D3. This can reduce the voltage fluctuation range between the anode and cathode of the light-emitting diode of the photocoupler U1, and prevent the photocoupler U1 from being damaged by a large voltage.

[0112] exist Figure 6 In the example shown, the wake-up signals sent by the four wake-up sub-circuits are all high-level signals, the power supply control module is an OR gate, the power supply module is DCDC, the power consumption module is the control module MCU and the various functional blocks of the BMS, and the wake-up signals sent by the four wake-up sub-circuits are all connected to the enable end of the DCDC through the OR gate. The OR gate can send an enable signal EN to the DCDC when receiving any wake-up signal. When the DCDC receives the enable signal EN, it provides working power, such as 3.3V, 5V, etc., to the various functional blocks and MCU of the BMS. The wake-up signal sent by any of the four wake-up sub-circuits can wake up the BMS. The MCU can also output a self-holding enable signal EN according to a preset rule. The self-holding enable signal EN is connected to the OR gate. When the wake-up signals sent by the four wake-up sub-circuits disappear, the BMS can be kept in the wake-up state through the self-holding enable signal EN.

[0113] The MCU can send a first control signal to the main positive relay according to preset rules to control the main positive relay to close or open. The MCU can also send a second control signal to the main negative relay according to preset rules to control the main negative relay to close or open, thereby realizing power supply management for the load.

[0114] In summary, the BMS wake-up circuit wakes up the BMS through the load wake-up sub-circuit to manage the power supply to the load; and wakes up the BMS through any wake-up sub-circuit such as the key wake-up sub-circuit, the control module wake-up sub-circuit, the charging wake-up sub-circuit, etc. to manage the power supply to the power supply module.

[0115] An embodiment of the present application also provides a battery management system, which may include a BMS wake-up circuit, a power supply control module, a power supply module, and a power consumption module as in the aforementioned embodiment.

[0116] A power supply control module, configured to send an enable signal to the power supply module in response to a wake-up signal sent by a wake-up subcircuit of the BMS wake-up circuit;

[0117] The power supply module is used to supply power to the power consumption module in response to the enable signal so as to wake up the power consumption module.

[0118] The power consumption module may include a control module;

[0119] A control module, used for sending a self-holding enable signal to the power supply control module after waking up;

[0120] The power supply control module is used to send an enable signal to the power supply module in response to the self-holding enable signal.

[0121] An embodiment of the present application also provides a battery system, which includes: a power supply circuit and a battery management system.

[0122] The embodiment of the present application further provides an electronic device, which includes: a battery system, which is used to wake up the BMS in the above-mentioned manner. The electronic device can be, for example, an eVTOL flying car, an electric car, or any other one.

[0123] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0124] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery management system wake-up circuit, characterized in that: The battery management system wake-up circuit includes: a load wake-up sub-circuit, and the load wake-up sub-circuit includes: a load wake-up switch module and a load wake-up signal output module; The first end of the load wake-up switch module is connected to the first end of the first switch module of the power supply circuit of the battery system, the second end of the load wake-up switch module is connected to the second end of the first switch module, the third end of the load wake-up switch module is connected to the load wake-up signal output module, the fourth end of the load wake-up switch module is connected to the power supply control module of the battery management system, and the power supply control module of the battery management system is also connected to the power supply module of the power consumption module of the battery management system; When the power supply circuit is connected to a load, the load wake-up switch module is turned on, so that the load wake-up signal output module outputs a wake-up signal to the power supply control module, and the wake-up signal is used to wake up the power supply control module to control the power supply module to supply power to the power-consuming module.

2. The circuit according to claim 1, characterized in that The load wake-up switch module includes: a first switch submodule; The third end of the first switch submodule is the third end of the load awakening switch module, and the fourth end of the first switch submodule is the fourth end of the load awakening switch module.

3. The circuit according to claim 2, characterized in that The load wake-up switch module further includes: a first current limiting submodule and / or a second current limiting submodule; The first end of the first current limiting submodule is the first end of the load wake-up switch module, and the second end of the first current limiting submodule is connected to the first end of the first switch submodule; The first end of the second current limiting submodule is the second end of the load wake-up switch module, and the second end of the second current limiting submodule is connected to the second end of the first switch submodule.

4. The circuit according to claim 3, characterized in that The load wake-up switch module further includes: an overvoltage protection submodule; the overvoltage protection submodule is located between the first end and the second end of the first switch submodule.

5. The circuit according to claim 4, characterized in that The load wake-up switch module further includes: a first unidirectional conduction submodule; the first unidirectional conduction submodule is located at the second end of the first switch submodule.

6. The circuit according to any one of claims 1 to 5, characterized in that: The power supply circuit further includes a second switch module, and the second switch module is connected in series with the first switch module in the power supply circuit; The first switch module is located at the positive side of the power supply circuit, and the second switch module is located at the negative side of the power supply circuit; or the second switch module is located at the positive side of the power supply circuit, and the first switch module is located at the negative side of the power supply circuit.

7. The circuit according to claim 6, characterized in that The load wake-up subcircuit further includes: a load module; The first end of the load module is connected to the first end of the second switch module, and the second end of the load module is connected to the second end of the second switch module.

8. The circuit according to claim 7, characterized in that The load module comprises: a load submodule; the first end of the load submodule is the first end of the load module; and / or, a second unidirectional conducting submodule; The first end of the second unidirectional conducting submodule is the second end of the load module, and the second end of the second unidirectional conducting submodule is connected to the second end of the load submodule.

9. A battery management system, characterized in that: The battery management system comprises a battery management system wake-up circuit, a power supply control module, a power supply module and a power consumption module according to any one of claims 1 to 7; The power supply control module is used to send an enable signal to the power supply module in response to a wake-up signal sent by the wake-up subcircuit of the battery management system wake-up circuit; The power supply module is used to supply power to the power-consuming module in response to the enable signal, so as to wake up the power-consuming module.

10. The battery management system according to claim 9, characterized in that: The power consumption module includes a control module; The control module is used to send a self-holding enable signal to the power supply control module after waking up; The power supply control module is used to send the enable signal to the power supply module in response to the self-holding enable signal.

11. A battery system, characterized in that: The battery system comprises: a power supply circuit, and a battery management system as claimed in any one of claims 9 or 10.

12. An electronic device, characterized in that: The electronic device comprises: the battery system as claimed in claim 11.

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