A wake-up circuit, battery management system, battery pack and power-consuming device

Abstract

The embodiment of the present application provides a wake-up circuit, a battery management system, a battery pack and an electric device, which relates to the technical field of electrochemical devices. The wake-up circuit includes a control module; a first switch, a second switch and a third switch, the third switch is electrically connected to the first switch, the second switch is connected in series with the first switch and in parallel with the third switch; the first switch, the second switch and the third switch are respectively turned on or off in response to a control signal of the control module; the first connection end and the second connection end are used to connect to an external device; a first wake-up module, the first port of the control module is electrically connected to the first wake-up module; in response to the first connection end and the second connection end being connected to an external charging device, the control module is awakened; and / or, a second wake-up module, the second port of the control module is electrically connected to the second wake-up module; in response to the first connection end and the second connection end being connected to an external electric device, the control module is awakened. Based on this, power consumption can be reduced.

Description

Technical Field

[0001] The present application relates to the field of electrochemical devices, and in particular to a wake-up circuit, a battery management system, a battery pack, and an electrical device. Background Art

[0002] With the rapid development of battery technology, its application areas are also expanding. For example, in the field of electric vehicles, during the operation of the battery pack, the microprocessor unit can obtain the status information of the battery module (including voltage, current, temperature, etc.) and send the obtained status information to external devices (such as chargers or power-consuming devices).

[0003] In the related art, each module in the battery pack is in a continuous working state, which will consume a large amount of power of the battery pack and reduce the standby time of the battery pack. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a wake-up circuit, a battery management system, a battery pack and an electrical device to reduce power consumption and extend the standby time of the battery pack.

[0005] In a first aspect, an embodiment of the present application provides a wake-up circuit, the wake-up circuit comprising:

[0006] A control module; a first switch, a second switch and a third switch, the third switch is electrically connected to the first switch, the second switch is connected in series with the first switch and in parallel with the third switch; the first switch, the second switch and the third switch are turned on or off in response to the control signal of the control module respectively; a first connection end and a second connection end, the first connection end and the second connection end are used to connect to an external device; a first wake-up module, the first port of the control module is electrically connected to the first wake-up module; wherein, in response to the first connection end and the second connection end being connected to an external charging device, the control module is awakened; and / or, a second wake-up module, the second port of the control module is electrically connected to the second wake-up module; wherein, in response to the first connection end and the second connection end being connected to an external power-consuming device, the control module is awakened.

[0007] Optionally, the second switch is electrically connected to the first connection end and the first wake-up module respectively; the third switch is electrically connected to the first wake-up module, the first connection end and the second wake-up module respectively; in response to the first connection end and the second connection end being connected to an external charging device, the control module is awakened, and also includes: a charging current flows to the first wake-up module through the second switch and the third switch to generate a first signal at the first port to wake up the control module; and / or, in response to the first connection end and the second connection end being connected to an external electrical device, the control module is awakened, and also includes: a discharging current flows to the second wake-up module through the first switch and the third switch to generate a second signal at the second port to wake up the control module.

[0008] Optionally, the first wake-up module includes a fourth switch and a fifth switch, the fourth switch is electrically connected to the fifth switch, the first port, and the ground, respectively; the charging current flows to the first wake-up module through the second switch and the third switch to generate a first signal at the first port to wake up the control module, including: the fifth switch is turned on in response to the charging current; in response to the turning on of the fifth switch, the fourth switch turns on the connection between the first port and the ground to generate a first signal at the first port.

[0009] Optionally, the first wake-up module further includes a first resistor, a first end of the first resistor is electrically connected between the fourth switch and the fifth switch; and a second end of the first resistor is electrically connected between the fourth switch and ground.

[0010] Optionally, the first wake-up module also includes: a second resistor, a third resistor and a fourth resistor; the second resistor is electrically connected between the first port and the power supply end, the third resistor is electrically connected between the fourth switch and the fifth switch, the first end of the fourth resistor is electrically connected to the fifth switch, and the second end of the fourth resistor is electrically connected between the first switch and the second switch.

[0011] Optionally, the second wake-up module includes a sixth switch and a seventh switch, the sixth switch is electrically connected to the seventh switch, the second port, and the ground, respectively; the discharge current flows to the second wake-up module through the first switch and the third switch to generate a second signal at the second port to wake up the control module, and also includes: the seventh switch is turned on in response to the discharge current; in response to the turning on of the seventh switch, the sixth switch turns on the connection between the second port and the ground to generate a second signal at the second port.

[0012] Optionally, the second wake-up module further includes a fifth resistor; a first end of the fifth resistor is electrically connected between the sixth switch and the seventh switch, and a second end of the fifth resistor is electrically connected between the sixth switch and ground.

[0013] Optionally, the second wake-up module also includes: a sixth resistor, a seventh resistor and an eighth resistor; the seventh resistor and the eighth resistor are connected in series and electrically connected to both ends of the sixth resistor; and the seventh switch is electrically connected to both ends of the eighth resistor.

[0014] Optionally, the second wake-up module also includes a ninth resistor and a tenth resistor; the ninth resistor is electrically connected between the sixth switch and the seventh switch, and is electrically connected to the fifth resistor; the tenth resistor is electrically connected between the second port and the power supply end.

[0015] In a second aspect, an embodiment of the present application provides a battery management system, comprising the wake-up circuit as described in the first aspect, and further comprising: a switch module and a communication module; wherein the communication module is electrically connected to the control module and the switch module respectively, the switch module executes switching in response to the control signal of the control module, and the communication module is connected to an external battery cell module in response to the conduction of the switch module.

[0016] Optionally, the switch module includes an eighth switch and a ninth switch, the eighth switch being electrically connected to the ninth switch, the control module, and the ground, respectively, and the ninth switch being turned on and off based on the on and off of the eighth switch; the switch module is turned on and off in response to a control signal of the control module, and the communication module is connected to an external battery cell module in response to the conduction of the switch module, and also includes: based on the control signal of the control module turning on the eighth switch, the communication module obtains electrical energy from the external battery cell module.

[0017] Optionally, the communication module includes a power carrier unit and an isolation unit, the power carrier unit is electrically connected to the control module, and the isolation unit is coupled to the power carrier unit and electrically connected to the first connection end and the second connection end.

[0018] Optionally, the isolation unit includes a coupling transformer and / or a capacitor.

[0019] In a third aspect, an embodiment of the present application provides a battery pack, comprising a battery management system and a battery cell module as described in the second aspect.

[0020] Optionally, the battery pack further includes a voltage adjustment module, and the voltage adjustment module is electrically connected to the battery cell module, the control module, and the communication module respectively.

[0021] Optionally, the voltage adjustment module includes: a voltage conversion unit and a voltage stabilization unit.

[0022] In a fourth aspect, an embodiment of the present application provides an electrical device, comprising a battery pack and a load as described in the third aspect, wherein the battery pack is used to supply power to the load.

[0023] The wake-up circuit provided in the embodiment of the present application includes: a control module; a first switch, a second switch and a third switch, the third switch is electrically connected to the first switch, the second switch is connected in series with the first switch, and is connected in parallel with the third switch; the first switch, the second switch and the third switch are respectively turned on or off in response to the control signal of the control module; a first connection end and a second connection end, the first connection end and the second connection end are used to connect to an external device; a first wake-up module, the first port of the control module is electrically connected to the first wake-up module; wherein, in response to the first connection end and the second connection end being connected to an external charging device, the control module is awakened; and / or, a second wake-up module, the second port of the control module is electrically connected to the second wake-up module; wherein, in response to the first connection end and the second connection end being connected to an external power-consuming device, the control module is awakened.

[0024] It can be seen that the wake-up circuit provided in the embodiment of the present application can wake up the control module when the first connection terminal and the second connection terminal are connected to an external charging device and / or an external power-consuming device. Correspondingly, the control module can be in a non-awakening state under other circumstances, thereby reducing the power consumed by the control module under other circumstances and extending the standby time of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0026] Figure 1 A circuit diagram of a first wake-up circuit provided in an embodiment of the present application;

[0027] Figure 2 A circuit diagram of a second wake-up circuit provided in an embodiment of the present application;

[0028] Figure 3 A circuit diagram of a third wake-up circuit provided in an embodiment of the present application;

[0029] Figure 4 A circuit diagram of a first battery management system provided in an embodiment of the present application;

[0030] Figure 5 A circuit diagram of a second battery management system provided in an embodiment of the present application;

[0031] Figure 6 A circuit diagram of a third battery management system provided in an embodiment of the present application;

[0032] Figure 7 A circuit diagram of a battery pack provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and thoroughly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field based on the present application belong to the scope of protection of the present application.

[0034] In order to solve the problem of large power consumption of each module in the battery pack in the related art, the embodiment of the present application provides a wake-up circuit, such as Figure 1 As shown, the wake-up circuit 10 includes: a control module 101; a first switch 102, a second switch 103 and a third switch 104, the third switch 104 is electrically connected to the first switch 102, the second switch 103 is connected in series with the first switch 102, and is connected in parallel with the third switch 104; the first switch 102, the second switch 103 and the third switch 104 are respectively turned on or off in response to the control signal of the control module 101; a first connection terminal 105 and a second connection terminal 106, the first connection terminal 105 and the second connection terminal 106 are used Connecting to an external device; first wake-up module 107, the first port (not shown in the figure) of the control module 101 is electrically connected to the first wake-up module 107; wherein, in response to the first connection terminal 105 and the second connection terminal 106 being connected to an external charging device, the control module 101 is awakened; and / or, second wake-up module 108, the second port (not shown in the figure) of the control module 101 is electrically connected to the second wake-up module 108; wherein, in response to the first connection terminal 105 and the second connection terminal 106 being connected to an external power-consuming device, the control module 101 is awakened. wherein, after the first connection terminal 105 and the second connection terminal 106 are connected to an external charging device (such as a charger), the external charging device can provide a charging current to the battery pack to charge the battery pack; after the first connection terminal 105 and the second connection terminal 106 are connected to an external power-consuming device, the battery pack discharges to provide power to the external power-consuming device, and the external device receives the discharge current of the battery pack.

[0035] Figure 1 In the description, the awakening circuit 10 includes both the first awakening module 107 and the second awakening module 108 as an example. In some other implementations, the awakening circuit 10 may include only the first awakening module 107, or may include only the second awakening module 108.

[0036] Based on the above-mentioned wake-up circuit 10, the control module 101 can be awakened when the first connection terminal 105 and the second connection terminal 106 are connected to an external charging device and / or an external power-consuming device. Correspondingly, the control module 101 can be in a non-awakening state under other circumstances, thereby reducing the power consumed by the control module 101 under other circumstances and extending the standby time of the battery pack.

[0037] The first switch 102, the second switch 103 and the third switch 104 can be controllable switches, including but not limited to at least one of a triode, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), a relay or an IGBT (Insulated Gate Bipolar Transistor). Triodes are mainly used in low-power scenarios. When the battery pack to which the wake-up circuit 10 belongs is used as a power supply for low-power devices (for example, mobile phones, electric toys), the above switches can be triodes. MOSFET and IGBT are mainly used in high-power scenarios. When the battery pack to which the wake-up circuit 10 belongs is used as a power supply for high-power devices (for example, electric bicycles, electric vehicles, electric tools, energy storage equipment, and industrial electrical equipment, etc.), the above switches can be MOSFET and IGBT.

[0038] In addition, since IGBT is more expensive and occupies more space than MOSFET, when the battery pack to which the wake-up circuit 10 belongs is used as a power supply for electric bicycles, electric motorcycles, and electric tools, the above-mentioned switches can be MOSFETs, and when the battery pack to which the wake-up circuit 10 belongs is used as a power supply for electric vehicles, energy storage equipment, and industrial electrical equipment, the above-mentioned switches can be IGBTs or relays.

[0039] In one embodiment, the control module 101 may be a computing unit with data processing capability such as an MCU (Microcontroller Unit), a CPU (Central Processing Unit), or a single chip microcomputer.

[0040] The first connection terminal 105 may be a positive output terminal P+ of the battery pack, and correspondingly, the second connection terminal 106 may be a negative output terminal P- of the battery pack. The first port may be a charging wake-up port (i.e., CHG Wake up port) of the MCU. The second port may be a discharging wake-up port (i.e., Discharge DET port) of the MCU.

[0041] In one embodiment, the second switch 103 is electrically connected to the first connection terminal 105 and the first wake-up module 107 respectively; the third switch 104 is electrically connected to the first wake-up module 107, the first connection terminal 105 and the second wake-up module 108 respectively. Figure 2 , the third switch 104 is electrically connected to the first connection end 105 through the second wake-up module 108 .

[0042] Correspondingly, in response to the first connection terminal 105 and the second connection terminal 106 being connected to an external charging device, the control module 101 is awakened, and also includes: the charging current flows to the first wake-up module 107 through the second switch 103 and the third switch 104 to generate a first signal at the first port to wake up the control module 101.

[0043] In the embodiment of the present application, when the first connection terminal 105 and the second connection terminal 106 are connected to an external charging device, the charging current flowing to the battery cell module of the battery pack passes through the first connection terminal 105, and then passes through the second switch 103 and the third switch 104 respectively to reach the first wake-up module 107. In response to the current signal, the first wake-up module 107 can generate a first signal at the first port of the control module 101 to wake up the control module 101.

[0044] In one implementation, the first signal may be a low-level signal, that is, the first wake-up module 107 may generate a low-level signal at the first port to wake up the control module 101 .

[0045] In response to the first connection terminal 105 and the second connection terminal 106 being connected to an external power-consuming device, the control module 101 is awakened, and further includes:

[0046] The discharge current flows to the second wake-up module 108 via the first switch 102 and the third switch 104 to generate a second signal at the second port to wake up the control module.

[0047] In the embodiment of the present application, when the first connection terminal 105 and the second connection terminal 106 are connected to an external power device, the battery cell module of the battery pack discharges, and the discharge current flows to the external power device, passes through the first switch 102 and the third switch 104, and reaches the second wake-up module 108. In response to the current signal, the second wake-up module 108 can generate a second signal at the second port of the control module 101 to wake up the control module 101.

[0048] In one implementation, the second signal may be a low-level signal, that is, the second wake-up module 108 may generate a low-level signal at the second port to wake up the control module 101 .

[0049] In the embodiment of the present application, in order to reduce power consumption and extend the standby time of the battery pack to which the wake-up circuit 10 belongs, the control module 101 may have multiple different modes, for example: sleep mode, shutdown mode and working mode.

[0050] When the control module 101 does not communicate with an external device within a specified period of time, it can enter a sleep mode; when the voltage of the battery cell module of the battery pack is low, the battery cell module is in an undervoltage state, and the control module 101 can enter a shutdown mode. Entering the sleep mode and shutdown mode can reduce the power consumption of the control module 101 and extend the standby time of the battery pack.

[0051] Accordingly, when the control module 101 is in the sleep mode or the shutdown mode, when the control module 101 needs to communicate with an external device, for example, when the first connection terminal 105 and the second connection terminal 106 are connected to the external device, the control module 101 can receive a low-level signal at the first port and / or the second port to wake up the control module 101, that is, wake up the control module 101 from the sleep mode or the shutdown mode so that the control module 101 starts working.

[0052] In one embodiment, see Figure 3 The first wake-up module 107 includes a fourth switch 1071 and a fifth switch 1072 , and the fourth switch 1071 is electrically connected to the fifth switch 1072 , the first port, and the ground respectively.

[0053] Correspondingly, the charging current flows to the first wake-up module 107 via the second switch 103 and the third switch 104 to generate a first signal at the first port to wake up the control module 101, including: the fifth switch 1072 is turned on in response to the charging current; in response to the turning on of the fifth switch 1072, the fourth switch 1071 turns on the connection between the first port and the ground to generate a first signal at the first port.

[0054] Figure 3 In the embodiment, the first connection terminal 105 is the positive output terminal P+ of the battery pack, and the second connection terminal 106 is the negative output terminal P- of the battery pack. The negative output terminal P- is electrically connected to the negative electrode B- of the battery cell module of the battery pack, and the positive electrode B+ of the battery cell module is electrically connected to the first switch 102 and the first wake-up module 107.

[0055] in addition, Figure 3 In the embodiment, the second wake-up module 108 includes a sixth switch 1081 and a seventh switch 1082, and the sixth switch 1081 is electrically connected to the seventh switch 1082, the second port, and the ground respectively.

[0056] Correspondingly, the discharge current flows to the second wake-up module 108 through the first switch 102 and the third switch 104 to generate a second signal at the second port to wake up the control module 101, and also includes: the seventh switch 1082 is turned on in response to the discharge current; in response to the turning on of the seventh switch 1082, the sixth switch 1081 turns on the connection between the second port and the ground to generate a second signal at the second port.

[0057] For the selection of the fourth switch 1071 , the fifth switch 1072 , the sixth switch 1081 and the seventh switch 1082 , reference may be made to the detailed description of the first switch 102 .

[0058] Figure 3 In the figure, the first switch 102 can be called a charging switch, the second switch 103 can be called a discharging switch, and the third switch 104 can be called a pre-discharging switch. When the voltage of the battery module is low and the battery module is under-voltage, the third switch 104 is disconnected to prevent the battery module from discharging.

[0059] In one implementation, when the control module 101 is in shutdown mode, both the first switch 102 and the second switch 103 are disconnected. When the first switch 102 is disconnected, the current from the first connection terminal 105 to the battery module can be prevented, that is, the external charging device is prevented from charging the battery module; when the second switch 103 is disconnected, the current from the battery module to the first connection terminal 105 can be prevented, that is, the battery module is prevented from discharging to the external electrical device.

[0060] When the control module 101 is in working mode, for example, when the first connection terminal 105 and the second connection terminal 106 are connected to an external power device or an external charging device, and the battery module is in normal discharge or charging, the first switch 102 and the second switch 103 are turned on.

[0061] In addition, when the control module 101 is in sleep mode, the first switch 102 and the second switch 103 are disconnected, and the third switch 104 is turned on. At this time, the battery cell module can discharge through the first switch 102 and the third switch 104 to provide power to external electrical equipment connected to the first connection terminal 105 and the second connection terminal 106.

[0062] The control module 101 can respectively control the on and off of the first switch 102, the second switch 103 and the third switch 104. For example, the first switch 102 has a control terminal, such as the base of a transistor, the gate of a MOSFET and the gate of an IGBT. In the embodiment of the present application, the control terminal of the first switch 102 is connected to the control module 101, and the control module 101 can send a control signal to the control terminal of the first switch 102 to control the on and off of the first switch 102.

[0063] In one implementation, the control signal sent by the control module 101 may be a high level signal or a low level signal. For example, when the control module 101 outputs a high level signal to the control end of the first switch 102, the first switch 102 is turned on; when the control module 101 stops outputting a high level signal to the control end of the first switch 102, the first switch 102 is turned off.

[0064] In addition, the control module 101 may also send a low-level signal to the control end of the first switch 102 to control the first switch 102 to be turned on. This may be set according to actual conditions, and this application does not make any specific limitation on this.

[0065] The manner in which the control module 101 controls the second switch 103 and the third switch 104 to be turned on and off may refer to the detailed description of the above-mentioned control of the first switch 102 to be turned on and off.

[0066] In the embodiment of the present application, when the control module 101 is in sleep mode, the third switch 104 is turned on. When the first connection terminal 105 and the second connection terminal 106 are connected to external devices (including external charging devices and external power devices), the control module 101 can receive a low level signal to wake up the control module 101.

[0067] In one embodiment, when the control module 101 is in shutdown mode and the first connection terminal 105 and the second connection terminal 106 are connected to an external charging device, the control module 101 may receive a low level signal to wake up the control module 101 .

[0068] Exemplarily, when the control module 101 is in sleep mode, if the first connection terminal 105 and the second connection terminal 106 are connected to an external charging device, the current output by the external charging device passes through the body diode of the second switch 103 and the third switch 104, respectively, and reaches the fifth switch 1072. The fifth switch 1072 is turned on in response to the current signal. After the fifth switch 1072 is turned on, a control signal is triggered at the control end of the fourth switch 1071 to turn on the fourth switch 1071, thereby turning on the connection between the first port and the ground, and generating a low level signal at the first port to wake up the control module 101.

[0069] When the control module 101 is in sleep mode, if the first connection terminal 105 and the second connection terminal 106 are connected to an external power-consuming device, the battery module discharges, and the output current passes through the body diode of the first switch 102 and the third switch 104 to reach the seventh switch 1082. The seventh switch 1082 is turned on in response to the current signal. After the seventh switch 1082 is turned on, a control signal is triggered at the control terminal of the sixth switch 1081 to turn on the sixth switch 1081, and then the connection between the second port and the ground is turned on, and a low-level signal is generated at the second port to wake up the control module 101.

[0070] When the control module 101 is in shutdown mode, if the first connection terminal 105 and the second connection terminal 106 are connected to an external charging device, the external charging device charges the battery module, and the output current passes through the body diode of the second switch 103 and the body diode of the third switch 104, respectively, and reaches the fifth switch 1072. The fifth switch 1072 is turned on in response to the current signal. After the fifth switch 1072 is turned on, a control signal is triggered at the control end of the fourth switch 1071 to turn on the fourth switch 1071, and then the connection between the first port and the ground is turned on, and a low level signal is generated at the first port to wake up the control module 101.

[0071] When the control module 101 is in the shutdown mode, if the first connection terminal 105 and the second connection terminal 106 are connected to an external electrical device, since the third switch 104 is in the disconnected state, the discharge current will not flow to the second wake-up module 108. Therefore, the second wake-up module 108 will not be triggered to generate a low-level signal at the second port, and the control module 101 will not be woken up.

[0072] In one embodiment, see Figure 3 The first wake-up module 107 further includes a first resistor 1073; a first end of the first resistor 1073 is electrically connected between the fourth switch 1071 and the fifth switch 1072; and a second end of the first resistor 1073 is electrically connected between the fourth switch 1071 and the ground.

[0073] Correspondingly, in response to the conduction of the fifth switch 1072 , the fourth switch 1071 conducts the connection between the first port and the ground to generate a first signal at the first port, and further includes: the fourth switch 1071 is turned on in response to the voltage generated by the charging current across the first resistor 1073 .

[0074] Figure 3 In the embodiment, when the first connection terminal 105 and the second connection terminal 106 are connected to an external charging device, the voltage of the external charging device is higher than the voltage of the battery module, and the fifth switch 1072 is turned on in response to the voltage between the emitter and the base, so that the voltage across the first resistor 1073 reaches the turn-on voltage of the fourth switch 1071, so as to turn on the fourth switch 1071. In addition, if the first connection terminal 105 and the second connection terminal 106 are not connected to an external charging device, the fifth switch 1072 is turned off, and the gate of the fourth switch 1071 is grounded through the first resistor 1073, so as to turn off the fourth switch 1071.

[0075] In one embodiment, see Figure 3The first wake-up module 107 further includes: a second resistor 1074, a third resistor 1075 and a fourth resistor 1076. The second resistor 1074 is electrically connected between the first port and the power supply end, the third resistor 1075 is electrically connected between the fourth switch 1071 and the fifth switch 1072, the first end of the fourth resistor 1076 is electrically connected to the fifth switch 1072, and the second end of the fourth resistor 1076 is electrically connected between the first switch 102 and the second switch 103.

[0076] Among them, the power supply end (VCC end) is electrically connected to the external battery module. In one embodiment, the external battery module is used to power the control module 101. For example, the external battery module can be a battery module in the battery pack to which the wake-up circuit 10 belongs. In the embodiment of the present application, the VCC end can be electrically connected to the B+ of the battery module. A second resistor 1074 is set between the first port and the VCC end to prevent the first port of the control module 101 from being directly connected to the VCC end and burning out.

[0077] A third resistor 1075 is disposed between the first resistor 1073 and the fifth switch 1072 to prevent the voltage across the first resistor 1073 from being too large and burning out the fourth switch 1071 when the first connection terminal 105 and the second connection terminal 106 are connected to an external charging device.

[0078] By providing the fourth resistor 1076 , when the first connection terminal 105 and the second connection terminal 106 are connected to an external charging device, it is prevented that the fifth switch 1072 is burned out due to excessive current.

[0079] In one embodiment, see Figure 3 The second wake-up module 108 further includes a fifth resistor 1083; a first end of the fifth resistor 1083 is electrically connected between the sixth switch 1081 and the seventh switch 1082, and a second end of the fifth resistor 1083 is electrically connected between the sixth switch 1081 and the ground.

[0080] Correspondingly, in response to the conduction of the seventh switch 1082 , the sixth switch 1081 conducts the connection between the second port and the ground to generate a second signal at the second port, and further includes: the sixth switch 1081 is turned on in response to the voltage generated across the fifth resistor 1083 by the discharge current.

[0081] In the embodiment of the present application, when the first connection terminal 105 and the second connection terminal 106 are connected to an external power device, the seventh switch 1082 is turned on, so that the voltage across the fifth resistor 1083 reaches the turn-on voltage of the sixth switch 1081, so as to turn on the sixth switch 1081. In addition, if the first connection terminal 105 and the second connection terminal 106 are not connected to an external power device, the seventh switch 1082 is turned off, and the gate of the sixth switch 1081 is grounded through the fifth resistor 1083, so as to turn off the sixth switch 1081.

[0082] In one embodiment, see Figure 3 The second wake-up module 108 further includes: a sixth resistor 1084, a seventh resistor 1085 and an eighth resistor 1086; the seventh resistor 1085 and the eighth resistor 1086 are connected in series and electrically connected to both ends of the sixth resistor 1084; the seventh switch 1082 is electrically connected to both ends of the eighth resistor 1086. The seventh switch 1082 is turned on in response to the discharge current, and further includes: the seventh switch 1082 is turned on in response to the voltage generated by the discharge current at both ends of the eighth resistor 1086.

[0083] In the embodiment of the present application, when the first connection terminal 105 and the second connection terminal 106 are connected to an external electrical device, the voltage drop generated by the current passing through the sixth resistor 1084 reaches the turn-on voltage of the seventh switch 1082 through the voltage division of the eighth resistor 1086 to turn on the seventh switch 1082.

[0084] The seventh resistor 1085 and the eighth resistor 1086 are connected in series and electrically connected to both ends of the sixth resistor 1084 to prevent the voltage across both ends of the eighth resistor 1086 from being too large and burning out the seventh switch 1082 .

[0085] In one embodiment, see Figure 3 The second wake-up module 108 also includes a ninth resistor 1087 and a tenth resistor 1088; the ninth resistor 1087 is electrically connected between the sixth switch 1081 and the seventh switch 1082, and is electrically connected to the fifth resistor 1083; the tenth resistor 1088 is electrically connected between the second port and the power supply end (VCC end).

[0086] The VCC terminal is electrically connected to the external battery module. In the embodiment of the present application, the VCC terminal can be electrically connected to the B+ of the battery module. A tenth resistor 1088 is set between the second port and the VCC terminal to prevent the second port of the control module 101 from being directly connected to the VCC terminal and burning out.

[0087] A ninth resistor 1087 is disposed between the fifth resistor 1083 and the seventh switch 1082 to prevent the sixth switch 1081 from being burned out due to excessive voltage across the fifth resistor 1083 when the first connection terminal 105 and the second connection terminal 106 are connected to an external electrical device.

[0088] The present application also provides a battery management system (BMS), which includes any wake-up circuit 10 in the above embodiments. Figure 4 , Figure 4 A circuit diagram of a battery management system provided in an embodiment of the present application, the battery management system comprising Figure 3 The wake-up circuit 10 , the switch module 20 and the communication module 30 are shown.

[0089] Among them, the communication module 30 is electrically connected to the control module 101 and the switch module 20 respectively. The switch module 20 performs on-off in response to the control signal of the control module 101. The communication module 30 is connected to the external battery module in response to the conduction of the switch module 20.

[0090] In the embodiment of the present application, the communication module 30 is configured to form a conductive connection with an external battery module in response to an external device accessing the first connection terminal 105 and the second connection terminal 106 .

[0091] In one implementation, when the control module 101 enters the sleep mode or shutdown mode, a control signal is sent to the switch module 20 so that the switch module 20 disconnects the connection between the communication module 30 and the external battery cell module, thereby reducing the power consumed by the communication module 30 and extending the standby time of the battery pack.

[0092] When the control module 101 is awakened, the control module 101 can send a control signal to the switch module 20 to enable the switch module 20 to connect the communication module 30 to the external battery module. The control module 101 can communicate with the external device through the communication module 30.

[0093] In one embodiment, see Figure 5 ,exist Figure 4 On the basis of, the switch module 20 includes an eighth switch 201 and a ninth switch 202 , the eighth switch 201 is electrically connected to the ninth switch 202 , the control module 101 , and the ground respectively, and the ninth switch 202 is turned on and off based on the on and off of the eighth switch 201 .

[0094] Correspondingly, the switch module 20 performs on-off in response to the control signal of the control module 101, and the communication module 30 is connected to the external battery cell module in response to the conduction of the switch module 20, and also includes: based on the control signal of the control module 101 turning on the eighth switch 201, the communication module 30 obtains the electric energy of the external battery cell module.

[0095] Regarding the selection of the eighth switch 201 and the ninth switch 202 , reference may be made to the above detailed introduction of the first switch 102 .

[0096] In an embodiment of the present application, the control module 101 can control the on and off of the eighth switch 201, and thus can control the on and off of the ninth switch 202. For example, when the control module 101 needs to communicate with an external device, the eighth switch 201 can be controlled to be turned on, thereby turning on the ninth switch 202. At this time, the communication module 30 is connected to the external battery module, and the external battery module supplies power to the communication module 30, so that the control module 101 can communicate with the external device through the communication module 30. Conversely, when the control module 101 does not need to communicate with an external device, the eighth switch 201 can be controlled to be turned off, thereby turning off the ninth switch 202, and the communication module 30 is disconnected from the external battery module, which can reduce power consumption and extend the standby time of the battery pack to which the wake-up circuit 10 belongs.

[0097] In one embodiment, see Figure 6 ,exist Figure 5 On the basis, the communication module 30 includes a power carrier unit 301 and an isolation unit 302, the power carrier unit 301 is electrically connected to the control module 101, the isolation unit 302 is coupled to the power carrier unit 301, and is electrically connected to the first connection terminal 105 and the second connection terminal 106.

[0098] In one embodiment, the battery management system is used to send a first signal to the control module 101, and the external device receives and demodulates the first signal; or, the external device sends a second signal, the communication module 30 receives and demodulates the second signal, and the control module 101 obtains the demodulated second signal.

[0099] Based on the above battery management system, the control module 101 can communicate with the external charging device and / or the external power device through the first connection terminal 105 and the second connection terminal 106 for connecting the external charging device and / or the external power device. There is no need to reserve a designated communication port in the battery pack, which can avoid the contact failure of the designated communication port and improve the reliability of the battery pack. The battery pack reduces the number of communication harnesses corresponding to the designated communication port, which can reduce costs and improve the communication method between the battery pack and the external device.

[0100] In one implementation, see Figure 6The battery management system may further include an acquisition module 40, which is a module for acquiring parameters of the battery cell module. The parameters of the battery cell module may include parameters such as the voltage, current, and temperature of the battery. The acquisition module 40 may be an IC (Integrated Circuit), such as an AFE (Analog Front End), etc. The acquisition module 40 may measure the voltage of the battery cell module through a voltage measurement circuit, measure the current of the battery cell module through a current measurement circuit, and measure the temperature of the battery cell module through a temperature sensor. The acquisition module 40 may be electrically connected to B- through a current measurement circuit to acquire the current of the battery cell module through the current measurement circuit. The acquisition module 40 may convert the acquired analog signal into a digital signal and transmit it to the control module 101. For example, the acquisition module 40 may transmit the converted digital signal to the control module 101 through an SCL (Serial Clock Line)\SDA (Serial Data Line) signal line.

[0101] Figure 6 In the embodiment, the control module 101 can send the signal obtained from the acquisition module 40 to the power carrier unit 301 through the TX (Transmit) port. The power carrier unit 301 can receive the signal through the RX (Receive) port, modulate the received signal, and send the modulated signal to the first connection terminal 105 and the second connection terminal 106 through the isolation unit 302, so that the external device obtains the modulated signal. In addition, the power carrier unit 301 can also receive the signal sent by the external device, demodulate the received signal, and send it to the control module 101 through the TX port.

[0102] The isolation unit 302 is used to isolate the power carrier unit 301 from the first connection terminal 105 and the second connection terminal 106 to prevent the current on the first connection terminal 105 and the second connection terminal 106 from burning out the power carrier unit 301 .

[0103] In one embodiment, the isolation unit 302 includes a coupling transformer and / or a capacitor. Figure 6 In the embodiment, the isolation unit 302 includes a coupling transformer 3021 and a capacitor 3022. Based on the isolation characteristics of the coupling transformer 3021 and the isolation characteristics of the capacitor 3022, the isolation between the power carrier unit 301 and the first connection terminal 105 and the second connection terminal 106 is achieved.

[0104] In another embodiment of the present application, the control module 101 may be electrically connected to the first switch 102 and the second switch 103 through the acquisition module 40, and the acquisition module 40 controls the on and off of the first switch 102 and the second switch 103 according to the detected state of the battery cell module.

[0105] In one embodiment, see Figure 6 The battery management system may also include a voltage balancing module 50, which is electrically connected between the battery module and the acquisition module 40, and is used to balance the voltages of the battery cells in the battery module. For example, when the voltages of the battery cells are inconsistent, the voltage balancing module 50 can discharge the battery cells with higher voltages. Based on this, the voltages of the battery cells in the battery module can be kept roughly consistent.

[0106] An embodiment of the present invention further provides a battery pack, which includes any battery management system in the above embodiments and a battery cell module.

[0107] In one embodiment, see Figure 7 , Figure 7 A circuit diagram of a battery pack provided in an embodiment of the present application, the battery pack further includes a voltage adjustment module 60, and the voltage adjustment module 60 is electrically connected to the battery cell module, the control module 101, and the communication module 30 respectively.

[0108] The voltage adjustment module 60 is used to adjust the voltage output by the battery module to provide power to the control module 101 and the communication module 30 .

[0109] In one embodiment, the voltage adjustment module 60 includes a voltage conversion unit 601 and a voltage stabilization unit 602 .

[0110] Exemplarily, the voltage conversion unit 601 may be a DC-DC (Direct Current-Direct Current Converter) for converting the voltage output by the battery module to obtain a voltage suitable for the control module 101 and a voltage VCC at the power supply end, and the voltage VCC at the power supply end may be used to power the communication module 30, the first wake-up module 107, and the second wake-up module 108. The voltage stabilizing unit 602 may be an LDO (Low Dropout Regulator) for eliminating the voltage ripple output by the voltage conversion unit 601 to ensure a stable voltage provided to the control module 101 and the communication module 30.

[0111] The embodiment of the present application provides an electrical device, including the battery pack and a load provided in the above embodiment of the present application, wherein the battery pack is used to supply power to the load. Exemplarily, the load is electrically connected to the battery pack via the first connection terminal 105 and the second connection terminal 106 .

[0112] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0113] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0114] As for the battery management system, battery pack, and power-consuming device embodiments, since they are basically similar to the wake-up circuit embodiments, the relevant parts can be referred to the wake-up circuit embodiments.

[0115] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A wake-up circuit, characterized in that: The wake-up circuit comprises: Control module; a first switch, a second switch and a third switch, wherein the third switch is electrically connected to the first switch, the second switch is connected in series with the first switch and in parallel with the third switch; the first switch, the second switch and the third switch are turned on or off in response to a control signal of the control module respectively; A first connection end and a second connection end, wherein the first connection end and the second connection end are used to connect to an external device; a first wake-up module, wherein the first port of the control module is electrically connected to the first wake-up module; wherein the control module is awakened in response to the first connection terminal and the second connection terminal being connected to an external charging device; and / or a second wake-up module, wherein the second port of the control module is electrically connected to the second wake-up module; wherein the control module is awakened in response to the first connection terminal and the second connection terminal being connected to an external power-consuming device; The second switch is electrically connected to the first connection end and the first wake-up module respectively; the third switch is electrically connected to the first wake-up module, the first connection end and the second wake-up module respectively; In response to the first connection terminal and the second connection terminal being connected to an external charging device, the control module is awakened, and further includes: The charging current flows to the first wake-up module through the second switch and the third switch to generate a first signal at the first port to wake up the control module.

2. The wake-up circuit according to claim 1, characterized in that: In response to the first connection end and the second connection end being connected to an external power-consuming device, the control module is awakened, and further includes: The discharge current flows to the second wake-up module through the first switch and the third switch to generate a second signal at the second port to wake up the control module.

3. The wake-up circuit according to claim 2, characterized in that: The first wake-up module includes a fourth switch and a fifth switch, and the fourth switch is electrically connected to the fifth switch, the first port, and the ground respectively; The charging current flows to the first wake-up module through the second switch and the third switch to generate a first signal at the first port to wake up the control module, including: The fifth switch is turned on in response to the charging current; In response to the fifth switch being turned on, the fourth switch connects the first port to the ground to generate a first signal at the first port.

4. The wake-up circuit according to claim 3, characterized in that: The first wake-up module further includes a first resistor, a first end of the first resistor is electrically connected between the fourth switch and the fifth switch; and a second end of the first resistor is electrically connected between the fourth switch and ground.

5. The wake-up circuit according to claim 3 or 4, characterized in that: The first wake-up module further includes: a second resistor, a third resistor and a fourth resistor; The second resistor is electrically connected between the first port and the power supply end, the third resistor is electrically connected between the fourth switch and the fifth switch, the first end of the fourth resistor is electrically connected to the fifth switch, and the second end of the fourth resistor is electrically connected between the first switch and the second switch.

6. The wake-up circuit according to claim 2, characterized in that: The second wake-up module includes a sixth switch and a seventh switch, and the sixth switch is electrically connected to the seventh switch, the second port, and the ground respectively; The discharge current flows to the second wake-up module through the first switch and the third switch to generate a second signal at the second port to wake up the control module, and further includes: The seventh switch is turned on in response to the discharge current; In response to the seventh switch being turned on, the sixth switch connects the second port to the ground to generate a second signal at the second port.

7. The wake-up circuit according to claim 6, characterized in that: The second wake-up module further includes a fifth resistor; a first end of the fifth resistor is electrically connected between the sixth switch and the seventh switch, and a second end of the fifth resistor is electrically connected between the sixth switch and ground.

8. The wake-up circuit according to claim 6, characterized in that: The second wake-up module further includes: a sixth resistor, a seventh resistor and an eighth resistor; the seventh resistor and the eighth resistor are connected in series and electrically connected to both ends of the sixth resistor; and the seventh switch is electrically connected to both ends of the eighth resistor.

9. The wake-up circuit according to claim 7, characterized in that: The second wake-up module also includes a ninth resistor and a tenth resistor; the ninth resistor is electrically connected between the sixth switch and the seventh switch, and is electrically connected to the fifth resistor; the tenth resistor is electrically connected between the second port and the power supply end.

10. A battery management system, characterized in that: The battery management system comprises the wake-up circuit according to any one of claims 1 to 9, and further comprises: a switch module and a communication module; The communication module is electrically connected to the control module and the switch module respectively, the switch module is switched on and off in response to a control signal of the control module, and the communication module is connected to an external battery cell module in response to the conduction of the switch module.

11. The battery management system according to claim 10, characterized in that: The switch module includes an eighth switch and a ninth switch, the eighth switch is electrically connected to the ninth switch, the control module, and the ground respectively, and the ninth switch is turned on and off based on the on and off of the eighth switch; The switch module performs on-off in response to the control signal of the control module, and the communication module is connected with the external battery module in response to the conduction of the switch module, and further includes: Based on the control signal of the control module turning on the eighth switch, the communication module obtains the electric energy of the external battery module.

12. The battery management system according to claim 10, characterized in that: The communication module includes a power carrier unit and an isolation unit. The power carrier unit is electrically connected to the control module. The isolation unit is coupled to the power carrier unit and is electrically connected to the first connection end and the second connection end.

13. The battery management system according to claim 12, characterized in that: The isolation unit includes a coupling transformer and / or a capacitor.

14. A battery pack, characterized in that: The battery pack includes a battery management system and a battery cell module as described in any one of claims 10-13.

15. The battery pack according to claim 14, characterized in that: The battery pack further includes a voltage adjustment module, which is electrically connected to the battery cell module, the control module, and the communication module respectively.

16. The battery pack according to claim 15, characterized in that: The voltage adjustment module includes: a voltage conversion unit and a voltage stabilization unit.

17. An electrical device, characterized in that: The electrical device comprises a battery pack and a load as described in any one of claims 14 to 16, and the battery pack is used to supply power to the load.

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