Battery management self-wake-up control circuit and method

Abstract

The application provides a battery management self-waking control circuit and method. The circuit comprises a current collection module, a current direction distinguishing module, a current wake-up judging module and a reference voltage module; the current collection module is used for collecting the charging and discharging current of the battery; the current direction distinguishing module is used for distinguishing the charging or discharging direction of the charging and discharging current of the battery; the current wake-up judging module is used for comparing the charging or discharging current of the battery after direction distinguishing with the corresponding preset threshold value, and controlling the battery management system to wake up or sleep based on the corresponding comparison result; and the reference voltage module is used for providing reference voltage for the current threshold value comparison of the current wake-up judging module. The application can accurately judge whether the current battery supplies power to the load or whether the external power supply charges the battery based on the accurately distinguished charging and discharging current and size, and then facilitates the automatic control of the battery management system to wake up and sleep according to the judgment result.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery management, and in particular to a battery management self-waking control circuit and method. BACKGROUND

[0002] With the development of automobile electrification, the power consumption of the vehicle electric control system gradually increases, and the disadvantages of small capacity and short service life of lead-acid batteries cannot meet the demand of the increasing power consumption of the vehicle electric control system, so lithium ion batteries will replace them.

[0003] However, lithium batteries need a special battery management system for control, and the static power consumption of the battery management system itself will be relatively large, and the vehicle may be out of power for a long time, resulting in failure to start, and even shortening the service life of the battery.

[0004] Therefore, how to reduce the static power consumption of the battery management system of the lithium battery, so as to avoid the problem that the vehicle may be out of power for a long time, resulting in failure to start, and prolong the service life of the battery, is a problem that those skilled in the art need to solve. SUMMARY

[0005] The embodiments of the present application provide a battery management self-waking control circuit and method to solve the problem that the static power consumption of the battery management system of the lithium battery is difficult to reduce in the prior art, thereby causing the problem that the vehicle may be out of power for a long time, resulting in failure to start, and shortening the service life of the battery.

[0006] In a first aspect, the embodiments of the present application provide a battery management self-waking control circuit, comprising: a current collection module, a current direction distinguishing module, a current wake-up judgment module and a reference voltage module;

[0007] The first end of the current collection module is connected to the negative electrode of the battery, the second end is grounded, the third end is connected to the first end of the reference voltage module, the fourth end is connected to the second end of the reference voltage module, and the fifth end is connected to the first end of the current direction distinguishing module, for collecting the charging and discharging current of the battery;

[0008] The second end of the current direction distinguishing module is connected to the first end of the reference voltage module, the third end is connected to the second end of the reference voltage module, the fourth end is connected to the first end of the current wake-up judgment module, and the fifth end is grounded, for distinguishing the charging or discharging direction of the charging and discharging current of the battery;

[0009] The second end of the current wake-up judgment module is connected with the first end of the reference voltage module, the third end is connected with the second end of the reference voltage module, the fourth end is connected with the battery management system as the output end of the current wake-up judgment module, and the fifth end is grounded, so as to compare the charging current or discharging current of the battery after direction distinguishing with the corresponding preset threshold, and control the battery management system to wake up or sleep based on the corresponding comparison result.

[0010] The third end of the reference voltage module is grounded, so as to provide a reference voltage for the current threshold comparison of the current wake-up judgment module.

[0011] In a possible implementation, the current direction distinguishing module comprises a charging current distinguishing circuit and a discharging current distinguishing circuit.

[0012] The first end of the charging current distinguishing circuit is connected with the fifth end of the current collecting module, the second end is connected with the first end of the reference voltage module, the third end is connected with the first end of the current wake-up judgment module, and the fourth end is grounded, so as to distinguish the charging current in the charging direction of the battery.

[0013] The first end of the discharging current distinguishing circuit is connected with the fifth end of the current collecting module, the second end is connected with the first end of the reference voltage module, the third end is connected with the second end of the reference voltage module, the fourth end is connected with the first end of the current wake-up judgment module, and the fifth end is grounded, so as to distinguish the discharging current in the discharging direction of the battery.

[0014] In a possible implementation, the charging current distinguishing circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a first operational amplifier.

[0015] One end of the first resistor is connected with the fifth end of the current collecting module, and the other end is connected with the inverting input end of the first operational amplifier, one end of the second resistor and one end of the first capacitor respectively.

[0016] The other end of the second resistor is connected with the other end of the first capacitor, and then connected with the output end of the first operational amplifier, as the third end of the charging current distinguishing circuit.

[0017] One end of the third resistor is connected with the first end of the reference voltage module, and the other end is connected with one end of the fourth resistor and the non-inverting input end of the first operational amplifier.

[0018] The other end of the fourth resistor is grounded.

[0019] In a possible implementation, the discharging current distinguishing circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor, a third capacitor and a second operational amplifier.

[0020] One end of the fifth resistor is connected to a fifth end of the current collecting module, and the other end is connected to one end of the sixth resistor and a non-inverting input end of the second operational amplifier.

[0021] The other end of the sixth resistor is grounded.

[0022] One end of the seventh resistor is connected to a first end of the reference voltage module, and the other end is connected to an inverting input end of the second operational amplifier, one end of the eighth resistor and one end of the second capacitor respectively.

[0023] The positive voltage supply end of the second operational amplifier is connected to one end of the third capacitor and a second end of the reference voltage module, and the negative voltage supply end is grounded.

[0024] The other end of the third capacitor is grounded.

[0025] The other end of the eighth resistor and the other end of the second capacitor are connected to the output end of the second operational amplifier, as a fourth end of the discharging current distinguishing circuit.

[0026] In a possible implementation, the current wake-up determination module comprises a charging current wake-up determination circuit and a discharging current wake-up determination circuit.

[0027] The first end of the charging current wake-up determination circuit is connected to the third end of the charging current distinguishing circuit, the second end is connected to the first end of the reference voltage module, the third end is connected to the second end of the reference voltage module, the fourth end is connected to the battery management system as an output end of the charging current wake-up determination circuit, and the fifth end is grounded, for comparing the charging current of the battery after direction distinguishing with a first preset threshold to obtain a first comparison result, and controlling the battery management system to wake up or sleep based on the first comparison result.

[0028] The first end of the discharging current wake-up determination circuit is connected to the fourth end of the discharging current distinguishing circuit, the second end is connected to the first end of the reference voltage module, the third end is connected to the battery management system as an output end of the discharging current wake-up determination circuit, and the fourth end is grounded, for comparing the discharging current of the battery after direction distinguishing with a second preset threshold to obtain a second comparison result, and controlling the battery management system to wake up or sleep based on the second comparison result.

[0029] In a possible implementation, the charging current wake-up determination circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a fourth capacitor, a fifth capacitor, a third operational amplifier, and a first diode.

[0030] One end of the ninth resistor is connected to a third end of the charging current distinguishing circuit, and the other end is connected to one end of the tenth resistor and a non-inverting input end of the third operational amplifier.

[0031] The other end of the tenth resistor is connected to an output end of the third operational amplifier and one end of the eleventh resistor.

[0032] The other end of the eleventh resistor is connected to one end of the fourth capacitor and one end of the first diode.

[0033] The other end of the first diode is connected to a battery management system as an output end of the charging current wake-up determination circuit.

[0034] The other end of the fourth capacitor is grounded.

[0035] One end of the twelfth resistor is connected to a first end of the reference voltage module, and the other end is connected to an inverting input end of the third operational amplifier.

[0036] The positive voltage supply end of the third operational amplifier is connected to a second end of the reference voltage module and one end of the fifth capacitor, and the negative voltage supply end is grounded.

[0037] The other end of the fifth capacitor is grounded.

[0038] In a possible implementation, the discharging current wake-up determination circuit comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a sixth capacitor, a fourth operational amplifier, and a second diode.

[0039] One end of the thirteenth resistor is connected to a fourth end of the discharging current distinguishing circuit, and the other end is connected to one end of the fourteenth resistor and a non-inverting input end of the fourth operational amplifier.

[0040] The other end of the fourteenth resistor is connected to an output end of the fourth operational amplifier and one end of the fifteenth resistor.

[0041] The other end of the fifteenth resistor is connected to one end of the sixth capacitor and one end of the second diode.

[0042] The other end of the second diode is connected to a battery management system as an output end of the discharging current wake-up determination circuit.

[0043] The other end of the sixth capacitor is grounded.

[0044] One end of the sixteenth resistor is connected to the first end of the reference voltage module, and the other end is connected to the inverting input end of the fourth operational amplifier.

[0045] In a possible implementation, the current acquisition module comprises a shunt, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor and a fifth operational amplifier.

[0046] The first end of the shunt is connected to the negative electrode of the battery, the second end is grounded, the third end is connected to one end of the seventeenth resistor, and the fourth end is connected to one end of the eighteenth resistor.

[0047] The other end of the seventeenth resistor is connected to one end of the seventh capacitor, one end of the ninth capacitor, one end of the tenth capacitor, one end of the twentieth resistor and the inverting input end of the fifth operational amplifier respectively.

[0048] The other end of the seventh capacitor is grounded.

[0049] The other end of the tenth capacitor is connected to the other end of the twentieth resistor, and then connected to the output end of the fifth operational amplifier and one end of the twenty-first resistor.

[0050] The other end of the eighteenth resistor is connected to one end of the eighth capacitor, the other end of the ninth capacitor, one end of the nineteenth resistor and the non-inverting input end of the fifth operational amplifier.

[0051] The other end of the eighth capacitor is grounded.

[0052] The other end of the nineteenth resistor is connected to the first end of the reference voltage module.

[0053] The other end of the twenty-first resistor is connected to one end of the twelfth capacitor, and then serves as the fifth end of the current acquisition module.

[0054] The other end of the twelfth capacitor is grounded.

[0055] The positive voltage supply end of the fifth operational amplifier is connected to the second end of the reference voltage module and one end of the eleventh capacitor, and the negative voltage supply end is grounded.

[0056] The other end of the eleventh capacitor is grounded.

[0057] In a possible implementation, the reference voltage module comprises a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a twenty-second resistor and a voltage reference chip.

[0058] One end of the thirteenth capacitor is connected to one end of the fourteenth capacitor, one end of the twenty-second resistor and a power input end of the voltage reference chip, and the other end is connected to the other end of the fourteenth capacitor and grounded, as a second end of the reference voltage reference module.

[0059] The other end of the twenty-second resistor is connected to an enable end of the voltage reference chip.

[0060] The ground end of the voltage reference chip is grounded, and the reference voltage source end is connected to one end of the fifteenth capacitor and one end of the sixteenth capacitor, as a first end of the reference voltage reference module.

[0061] The other end of the fifteenth capacitor is connected to the other end of the sixteenth capacitor and grounded.

[0062] In a second aspect, an embodiment of the present application provides a battery management self-waking control method based on the battery management self-waking control circuit according to the first aspect or any possible implementation manner of the first aspect, and the method comprises:

[0063] Collecting the charging and discharging current of the battery.

[0064] Determining whether the charging and discharging current is a charging current or a discharging current.

[0065] When the first current is a charging current, comparing the charging current with a first preset threshold to obtain a first comparison result, and controlling the battery management system to wake up or sleep based on the first comparison result.

[0066] When the first current is a discharging current, comparing the discharging current with a second preset threshold to obtain a second comparison result, and controlling the battery management system to wake up or sleep based on the second comparison result.

[0067] The embodiment of the present application provides a battery management self-waking control circuit and method, which comprises a current collection module, a current direction distinguishing module, a current wake-up judging module and a reference voltage module. The charging and discharging current of the battery is collected by the current collection module; at this time, it is difficult to determine whether the current of the battery is the charging current or the discharging current; therefore, the current direction distinguishing module is arranged to distinguish the charging or discharging direction of the charging and discharging current of the battery; then the charging current or the discharging current of the battery after the direction distinguishing is compared with the corresponding preset threshold value by the current wake-up judging module, and the battery management system is woken up or the battery management system is controlled to sleep based on the comparison result; the reference voltage module is used for providing the reference voltage for the current threshold value comparison of the current wake-up judging module. In this way, the charging current and the discharging current after the accurate distinguishing and the respective sizes can be used to determine whether the current battery supplies the load or whether the external power supply charges the battery, and then the automatic control of the battery management system wake-up and sleep can be realized according to the determination result, so that the static power consumption of the battery management system is effectively reduced, and then the problem that the vehicle cannot be started due to the possible power loss during long-term placement of the vehicle is avoided, and the service life of the battery is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0068] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0069] Figure 1 is a principle schematic diagram of the battery management self-waking control circuit provided by an embodiment of the present application;

[0070] Figure 2 is a principle schematic diagram of the current collection module in the battery management self-waking control circuit provided by the embodiment of the present application;

[0071] Figure 3 is a principle schematic diagram of the battery management self-waking control circuit provided by another embodiment of the present application;

[0072] Figure 4 is a principle schematic diagram of the charging current distinguishing circuit in the battery management self-waking control circuit provided by the embodiment of the present application;

[0073] Figure 5 is a principle schematic diagram of the discharging current distinguishing circuit in the battery management self-waking control circuit provided by the embodiment of the present application;

[0074] Figure 6is a principle schematic view of a current wake-up judgment module in a battery management self-waking control circuit provided by an embodiment of the present application;

[0075] Figure 7 is a principle schematic view of a charging current wake-up judgment circuit in a battery management self-waking control circuit provided by an embodiment of the present application;

[0076] Figure 8 is a principle schematic view of a discharging circuit wake-up judgment circuit in a battery management self-waking control circuit provided by an embodiment of the present application;

[0077] Figure 9 is a principle schematic view of a reference voltage reference module in a battery management self-waking control circuit provided by an embodiment of the present application;

[0078] Figure 10 is an implementation flowchart of a battery management self-waking control method provided by an embodiment of the present application. DETAILED DESCRIPTION

[0079] In the following description, specific details are set forth in order to provide a thorough understanding of embodiments of the application. However, persons of ordinary skill in the art will readily recognize that embodiments of the application can be practiced without

[0080] To make the objects, technical solutions and advantages of the present application clearer, the following will be described with reference to the accompanying drawings through specific embodiments.

[0081] Figure 1 is a principle schematic view of a battery management self-waking control circuit provided by an embodiment of the present application. As shown in the figure, Figure 1 the present embodiment provides a battery management self-waking control circuit, which comprises a current collection module 11, a current direction distinguishing module 12, a current wake-up judgment module 13 and a reference voltage reference module 14.

[0082] The first end of the current collection module 11 is connected to the negative electrode of a battery, the second end is grounded, the third end is connected to the first end of the reference voltage reference module 14, the fourth end is connected to the second end of the reference voltage reference module 14, and the fifth end is connected to the first end of the current direction distinguishing module 12, for collecting the charging and discharging current of the battery.

[0083] In this embodiment, the battery can be a lead-acid battery or a lithium-ion battery of a vehicle, and the application does not limit the same. That is, the first end of the current collection module 11 can be connected to the negative electrode of the lead-acid battery or the negative electrode of the lithium-ion battery of the vehicle, thereby facilitating the collection of the current of the vehicle battery loop. Based on the current collected by the current collection module 11 of the vehicle battery loop, the size and direction of the collected current can be judged by the subsequent other modules, so as to obtain a judgment result to control the battery management system to wake up or sleep.

[0084] The second end of the current direction distinguishing module 12 is connected to the first end of the reference voltage module 14, the third end is connected to the second end of the reference voltage module 14, the fourth end is connected to the first end of the current wake-up judgment module 13, and the fifth end is grounded, for distinguishing the charging or discharging direction of the charging or discharging current of the battery.

[0085] In this embodiment, the current direction distinguishing module 12 is used to distinguish the charging direction or the discharging direction of the current collected by the current collection module 11. The distinguishing result of the current direction distinguishing module 12 can be output to the current wake-up judgment module 13, so as to judge whether to control the battery management system to wake up or sleep based on the current wake-up judgment module 13.

[0086] The second end of the current wake-up judgment module 13 is connected to the first end of the reference voltage module 14, the third end is connected to the second end of the reference voltage module 14, the fourth end is connected to the battery management system as the output end of the current wake-up judgment module 13, and the fifth end is grounded, for comparing the charging current or the discharging current of the battery after the direction distinguishing with the corresponding preset threshold value, and controlling the battery management system to wake up or sleep based on the corresponding comparison result.

[0087] In this embodiment, the high level or the low level output by the current wake-up judgment module 13 can be set to correspondingly control the battery management system to wake up or sleep. For example, when the current wake-up judgment module 13 outputs a high level, the battery management system is controlled to wake up. When the current wake-up judgment module 13 outputs a low level, the battery management system is controlled to sleep.

[0088] The third end of the reference voltage module 14 is grounded, for providing a reference voltage for the current threshold value comparison of the current wake-up judgment module 13.

[0089] Optionally, Figure 2 The principle schematic diagram of the current collection module in the battery management self-waking control circuit provided by the embodiment of the application is as follows: Figure 2The current collection module 11 includes a shunt FL, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, and a fifth operational amplifier U5.

[0090] The first end of the shunt FL is connected to the negative electrode of the battery, the second end is grounded, the third end is connected to one end of the seventeenth resistor R17, and the fourth end is connected to one end of the eighteenth resistor R18.

[0091] The other end of the seventeenth resistor R17 is connected to one end of the seventh capacitor C7, one end of the ninth capacitor C9, one end of the tenth capacitor C10, one end of the twentieth resistor R20, and the inverting input end of the fifth operational amplifier U5.

[0092] The other end of the seventh capacitor C7 is grounded.

[0093] The other end of the tenth capacitor C10 is connected to the other end of the twentieth resistor C20, and then connected to the output end of the fifth operational amplifier U5 and one end of the twenty-first resistor R21.

[0094] The other end of the eighteenth resistor R18 is connected to one end of the eighth capacitor C8, the other end of the ninth capacitor C9, one end of the nineteenth resistor R19, and the non-inverting input end of the fifth operational amplifier U5.

[0095] The other end of the eighth capacitor C8 is grounded.

[0096] The other end of the nineteenth resistor R19 is connected to the first end of the reference voltage module 14 (i.e. the +2.5V_REF end shown). Figure 2

[0097] The other end of the twenty-first resistor R21 is connected to one end of the twelfth capacitor C12, and then connected to the fifth end of the current collection module 11.

[0098] The other end of the twelfth capacitor C12 is grounded.

[0099] The positive voltage supply end of the fifth operational amplifier U5 is connected to the second end of the reference voltage module 14 (i.e. the +5V_Standby end shown) and one end of the eleventh capacitor C11, and the negative voltage supply end is grounded. Figure 2

[0100] The other end of the eleventh capacitor C11 is grounded.

[0101] ​​In this embodiment, if the external power supplies the battery or the current battery supplies the load, the current of the battery loop can be collected based on the shunt FL (the current can be charging current or discharging current), and then the current is converted into a corresponding voltage signal based on the fifth operational amplifier U5 and output to the current direction distinguishing module 12. Further, the current direction distinguishing module 12 can accurately distinguish the current direction of the battery charging or discharging based on the voltage signal.

[0102] In addition, the current of the battery loop is collected by the shunt FL, and the voltage drop on the shunt FL is transmitted to each electronic device connected to the shunt by a differential method. Since the shunt FL has an accuracy of up to 0.5% at -40℃ to 85℃, and the minimum acquisition voltage can be up to 10uV, and the current acquisition range is 0.1A to 250A, the collected current of the battery loop is relatively accurate, which is also beneficial to the subsequent control of the wake-up and sleep of the battery management system.

[0103] Optionally, Figure 3 The principle schematic diagram of the battery management self-waking control circuit provided by another embodiment of the present application is shown in Figure 3 As a specific implementation of the battery management self-waking control circuit provided by the embodiment of the present application, the current direction distinguishing module 12 includes: a charging current distinguishing circuit 121 and a discharging current distinguishing circuit 122.

[0104] The first end of the charging current distinguishing circuit 121 is connected to the fifth end of the current collection module 11, the second end is connected to the first end of the reference voltage module 14, the third end is connected to the first end of the current wake-up judgment module 13, and the fourth end is grounded, which is used for distinguishing the charging current of the battery charging direction.

[0105] The first end of the discharging current distinguishing circuit 122 is connected to the fifth end of the current collection module 11, the second end is connected to the first end of the reference voltage module 14, the third end is connected to the second end of the reference voltage module 14, the fourth end is connected to the first end of the current wake-up judgment module 13, and the fifth end is grounded, which is used for distinguishing the discharging current of the battery discharging direction.

[0106] In this embodiment, the reference voltage value can be provided by the reference voltage module 14 to the current direction distinguishing module 12 for distinguishing the charging and discharging of the battery. For example, the reference comparison value is set as 2.5V. When the voltage signal output from the current collection module 11 is greater than 2.5V and input to the charging current distinguishing circuit 121 and the discharging current distinguishing circuit 122 respectively, the voltage signal input to the discharging current distinguishing circuit 122 can be normally amplified and output according to the set circuit logic; while the voltage signal input to the charging current distinguishing circuit 121 is not amplified and its output is controlled as 0V. In this way, the current collected by the shunt FL can be accurately distinguished as charging current or discharging current.

[0107] Optionally, Figure 4 The principle schematic diagram of the charging current distinguishing circuit in the battery management self-waking control circuit provided by the embodiment of the present application is shown in Figure 4 As a specific implementation of the battery management self-waking control circuit provided by the embodiment of the present application, the charging current distinguishing circuit 121 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1 and a first operational amplifier U1.

[0108] One end of the first resistor R1 is connected to the fifth end of the current collection module 11, and the other end is connected to the inverting input end of the first operational amplifier U1, one end of the second resistor R2 and one end of the first capacitor C1 respectively.

[0109] The other end of the second resistor R2 is connected to the other end of the first capacitor C1, and then connected to the output end of the first operational amplifier U1, as the third end of the charging current distinguishing circuit 121.

[0110] One end of the third resistor R3 is connected to the first end of the reference voltage module 14 (i.e. Figure 4 the +2.5V_REF end shown), and the other end is connected to one end of the fourth resistor R4 and the non-inverting input end of the first operational amplifier U1.

[0111] The other end of the fourth resistor R4 is grounded.

[0112] In this embodiment, the reference voltage value can be provided by the reference voltage module 14 to the charging current distinguishing circuit 121. For example, as Figure 4As shown, the reference voltage value can be 2.5V. When the voltage signal output by the current collection module 11 is input to the charging current distinguishing circuit 121, when the input signal is greater than 2.5V, the input signal is not amplified, and the output is controlled to be 0V. When the input signal is less than 2.5V, the input signal is normally amplified and output. In this way, the current in the battery loop of the current vehicle can be accurately determined based on the signal output after the voltage signal passes through the charging current distinguishing circuit 121.

[0113] Optionally, Figure 5 The principle schematic diagram of the discharging current distinguishing circuit in the battery management self-waking control circuit provided by the embodiment of the present application is shown in FIG. 12. Figure 5 As a specific implementation manner of the battery management self-waking control circuit provided by the embodiment of the present application, the discharging current distinguishing circuit 122 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2, a third capacitor C3, and a second operational amplifier U2.

[0114] One end of the fifth resistor R5 is connected to the fifth end of the current collection module 11, and the other end is connected to one end of the sixth resistor R6 and the non-inverting input terminal of the second operational amplifier U2.

[0115] The other end of the sixth resistor R6 is grounded.

[0116] One end of the seventh resistor R7 is connected to the first end of the reference voltage module 14 (i.e. the +2.5V_REF end shown in FIG. 14), and the other end is respectively connected to the inverting input terminal of the second operational amplifier U2, one end of the eighth resistor R8, and one end of the second capacitor C2. Figure 5 The positive voltage supply end of the second operational amplifier U2 is connected to one end of the third capacitor C3 and the second end of the reference voltage module 14 (i.e. the +5V_Standby end shown in FIG. 14), and the negative voltage supply end is grounded.

[0117] Figure 5 The other end of the third capacitor C3 is grounded.

[0118] The other end of the eighth resistor R8 and the other end of the second capacitor C2 are connected, and are connected to the output terminal of the second operational amplifier U2, serving as the fourth end of the discharging current distinguishing circuit 122.

[0119] In the embodiment, the reference voltage module 14 can provide a reference voltage value for the discharging current distinguishing circuit 122. Exemplarily, as shown in FIG. 14,

[0120] In the embodiment, the reference voltage module 14 can provide a reference voltage value for the discharging current distinguishing circuit 122. Exemplarily, as shown in FIG. 14, Figure 5 ​As shown, the reference voltage value can also be 2.5V. When the voltage signal output by the current acquisition module 11 is input to the discharge current differentiation circuit 122, if the input signal is greater than 2.5V, the input signal is amplified normally and output. If the input signal is less than 2.5V, the input signal is not amplified, and its output is controlled to be 0V. In this way, the current in the current vehicle's battery circuit can be accurately determined as the discharge current based on the signal output after the voltage signal passes through the discharge current differentiation circuit 122.

[0121] Optional, Figure 6 This is a schematic diagram of the current wake-up determination module in the battery management self-wake-up control circuit provided in an embodiment of the present invention, as shown below. Figure 6 As shown. As a specific implementation of the battery management self-wake-up control circuit provided in this embodiment of the invention, the current wake-up determination module 13 includes: a charging current wake-up determination circuit 131 and a discharging current wake-up determination circuit 132.

[0122] The first terminal of the charging current wake-up determination circuit 131 (i.e. Figure 6 The A1 terminal shown is connected to the third terminal of the charging current differentiation circuit 121, the second terminal is connected to the first terminal of the reference voltage module 14, the third terminal is connected to the second terminal of the reference voltage module 14, the fourth terminal is connected to the battery management system as the output terminal of the charging current wake-up determination circuit 131, and the fifth terminal is grounded. It is used to compare the charging current of the battery after direction differentiation with the first preset threshold to obtain the first comparison result, and control the battery management system to wake up or go into sleep based on the first comparison result.

[0123] The first terminal of the discharge current wake-up determination circuit 132 (i.e. Figure 6 The B1 terminal shown is connected to the fourth terminal of the discharge current differentiation circuit 122, the second terminal is connected to the first terminal of the reference voltage module 14, the third terminal is connected to the battery management system as the output terminal of the discharge current wake-up determination circuit 132, and the fourth terminal is grounded. It is used to compare the discharge current of the battery after direction differentiation with the second preset threshold to obtain the second comparison result, and control the battery management system to wake up or go into sleep based on the second comparison result.

[0124] In this embodiment, as Figure 6 As shown, for the voltage signal output by the current direction differentiation module 12 (that is, the signal that represents whether the current collected by the current shunt is the charging current or the discharging current), when the voltage signal is input to the current wake-up determination module 13, the relationship between the current voltage signal and the preset threshold can be further determined according to the circuit logic, and then the battery management system can be controlled to wake up or sleep based on the obtained determination result.

[0125] Optional, Figure 7A principle diagram of a charging current wake-up judgment circuit in a battery management self-waking control circuit provided by an embodiment of the present application is shown in FIG. 13. As a specific implementation of the battery management self-waking control circuit provided by an embodiment of the present application, the charging current wake-up judgment circuit 131 comprises a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a fourth capacitor C4, a fifth capacitor C5, a third operational amplifier U3 and a first diode D1. Figure 7

[0126] One end of the ninth resistor R9 is connected to the third end of the charging current distinguishing circuit 121, and the other end is connected to one end of the tenth resistor R10 and the non-inverting input end of the third operational amplifier U3.

[0127] The other end of the tenth resistor R10 is connected to the output end of the third operational amplifier U3 and one end of the eleventh resistor R11.

[0128] The other end of the eleventh resistor R11 is connected to one end of the fourth capacitor C4 and one end of the first diode D1.

[0129] The other end of the first diode D1 is connected to the battery management system as the output end of the charging current wake-up judgment circuit 131.

[0130] The other end of the fourth capacitor C4 is grounded.

[0131] One end of the twelfth resistor R12 is connected to the first end of the reference voltage module 14 (i.e. the +2.5V_REF end shown in FIG. 13), and the other end is connected to the inverting input end of the third operational amplifier U3. Figure 7

[0132] The positive voltage supply end of the third operational amplifier U3 is connected to the second end of the reference voltage module 14 (i.e. the +5V_Standby end shown in FIG. 13) and one end of the fifth capacitor C5, and the negative voltage supply end is grounded. Figure 7

[0133] The other end of the fifth capacitor C5 is grounded.

[0134] In this embodiment, the reference voltage module 14 can provide a reference voltage value for the charging current wake-up judgment circuit 131. As an example, the reference voltage value can also be 2.5V, as shown in FIG. 13. When the charging current distinguishing circuit 121 outputs a certain voltage signal (at this time, the voltage signal can be 0V or a voltage value output after being amplified by the charging current distinguishing circuit 121), the charging current wake-up judgment circuit 131 compares the voltage value of the voltage signal with 2.5V to obtain a first comparison result. Figure 7

[0135] ​​​​In the case that the voltage signal is 0V, it indicates that there is no current or discharge current in the battery loop of the current vehicle. At this time, after the voltage signal passes through the charging current wake-up judgment circuit 131, the first comparison result is that the voltage value of the voltage signal is less than the first preset threshold value, and the charging current wake-up judgment circuit 131 outputs a low level signal. For example, the first preset threshold value can be set to 2.5V, 3V, etc., which is not limited in the present application.

[0136] In the case that the voltage signal is the voltage value output after amplification processing, it indicates that there is charging current in the battery loop of the current vehicle. In this case:

[0137] When the first comparison result is that the voltage value of the voltage signal is less than the first preset threshold value, the current charging current wake-up judgment circuit 131 outputs a low level signal.

[0138] When the first comparison result is that the voltage value of the voltage signal is greater than the first preset threshold value, the current charging current wake-up judgment circuit 131 outputs a high level signal. At this time, based on the high level signal, it can be determined that the current of the whole vehicle low voltage system of the current vehicle has reached the condition of charging wake-up battery management system, so as to correspondingly control the battery management system to wake up.

[0139] Optionally, Figure 8 The principle diagram of the discharge current wake-up judgment circuit in the battery management self-waking control circuit provided by the embodiment of the present application is shown in FIG. 13. Figure 8 As a specific implementation mode of the battery management self-waking control circuit provided by the embodiment of the present application, the discharge current wake-up judgment circuit 132 comprises a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a sixth capacitor C6, a fourth operational amplifier U4 and a second diode D2.

[0140] One end of the thirteenth resistor R13 is connected to the fourth end of the discharge current distinguishing circuit 122, and the other end is connected to one end of the fourteenth resistor R14 and the non-inverting input end of the fourth operational amplifier U4.

[0141] The other end of the fourteenth resistor R14 is connected to the output end of the fourth operational amplifier U4, and connected to one end of the fifteenth resistor R15.

[0142] The other end of the fifteenth resistor R15 is connected to one end of the sixth capacitor C6 and one end of the second diode D2.

[0143] The other end of the second diode D2 is connected to the battery management system as the output end of the discharge current wake-up judgment circuit 132.

[0144] The other end of the sixth capacitor C6 is grounded.

[0145] One end of the sixteenth resistor R16 is connected to the first end of the reference voltage module 14 (i.e. the +2.5V_REF end shown), and the other end is connected to the inverting input end of the fourth operational amplifier U4. Figure 8 The +2.5V_REF end shown), and the other end is connected to the inverting input end of the fourth operational amplifier U4.

[0146] In this embodiment, the reference voltage module 14 can provide a reference voltage value for the discharge current wake-up determination circuit 132. As an example, the reference voltage value can also be 2.5V, as shown. When the discharge current distinguishing circuit 122 outputs a certain voltage signal (at this time, the voltage signal can be 0V or a voltage value output after amplification processing by the discharge current distinguishing circuit 122), the discharge current wake-up determination circuit 132 compares the voltage value of the voltage signal with 2.5V to obtain a second comparison result. Figure 8

[0147] In the case where the voltage signal is 0V, it indicates that there is no current or charging current in the battery loop of the current vehicle. At this time, after the voltage signal passes through the discharge current wake-up determination circuit 132, the second comparison result is that the voltage value of the voltage signal is less than a second preset threshold value, and at this time the discharge current wake-up determination circuit 132 outputs a low-level signal. As an example, the second preset threshold value can be set to 2.5V, 3V, etc., which is not limited in the present application.

[0148] In the case where the voltage signal is a voltage value output after amplification processing, it indicates that the current vehicle is in a discharge current state. In this case:

[0149] When the second comparison result is that the voltage value of the voltage signal is less than the second preset threshold value, the current charging current wake-up determination circuit 131 outputs a low-level signal.

[0150] When the second comparison result is that the voltage value of the voltage signal is greater than the second preset threshold value, the current discharge current wake-up determination circuit 132 outputs a high-level signal. At this time, based on the high-level signal, it can be determined that the current of the entire vehicle low-voltage system of the current vehicle has reached the condition of discharging to wake up the battery management system, so that the battery management system can be correspondingly controlled to wake up.

[0151] In summary, based on the high-level signals output by the charging current wake-up determination circuit 131 and the discharge current wake-up determination circuit 132, the wake-up or sleep of the battery management system can be further controlled correspondingly.

[0152] Optionally, Figure 9 The principle diagram of the reference voltage module in the battery management self-wakeup control circuit provided in the embodiment of the present application is shown in FIG. 4. Figure 9 ​As shown, in one specific implementation of the battery management self-wake-up control circuit provided in this embodiment of the invention, the reference voltage module 14 includes: a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a twenty-second resistor R22, and a voltage reference chip IC.

[0153] One end of the thirteenth capacitor C13 is connected to one end of the fourteenth capacitor C14, one end of the twenty-second resistor R22, and the power input terminal of the voltage reference chip IC (i.e., Figure 9 After the VIN terminal shown, the second terminal of the reference voltage reference module 14 (i.e., Figure 9 The +5V_Standby terminal is shown, and the other end is connected to the other end of the fourteenth capacitor C14 and then grounded.

[0154] The other end of resistor R22 is connected to the enable pin of the voltage reference chip IC (i.e., Figure 9 (EN terminal shown).

[0155] The ground terminal of the voltage reference chip IC (i.e.) Figure 9 The GND terminal shown is grounded, and the reference voltage source terminal (i.e.) is... Figure 9 The VREF terminal shown is connected to one end of the fifteenth capacitor C15 and one end of the sixteenth capacitor C16, and serves as the first terminal of the reference voltage module 14 (i.e., Figure 9 (The +2.5V_REF terminal is shown).

[0156] The other end of the fifteenth capacitor C15 is connected to the other end of the sixteenth capacitor C16 and then grounded.

[0157] In this embodiment, as Figure 9 As shown, the reference voltage module 14 provides reference voltage values ​​for each module / circuit within the control circuit that requires voltage comparison. Figure 10 In the middle, NC is the floating pin of the voltage reference chip IC.

[0158] The embodiment of the present application provides a battery management self-waking control circuit, which comprises a current collection module 11, a current direction distinguishing module 12, a current wake-up judging module 13 and a reference voltage module 14. The charging and discharging current of the battery is collected through the current collection module; at this time, it is difficult to determine whether the current of the battery is the charging current or the discharging current; therefore, the current direction distinguishing module is arranged to distinguish the charging or discharging direction of the charging and discharging current of the battery; then the charging current or the discharging current of the battery after the direction distinguishing is compared with the corresponding preset threshold value through the current wake-up judging module, and the battery management system is woken up or controlled to sleep based on the comparison result; the reference voltage module is used for providing the reference voltage for the current threshold value comparison of the current wake-up judging module. In this way, based on the accurately distinguished charging current and discharging current and the respective sizes, it can be determined whether the current battery supplies power to the load or whether the external power supply charges the battery, and then the automatic control of the battery management system wake-up and sleep can be realized according to the determination result, so that the static power consumption of the battery management system is effectively reduced, and then the problem that the vehicle cannot be started due to the possible power loss during long-term placement of the vehicle is avoided, and the service life of the battery is prolonged.

[0159] In addition, the embodiment of the present application also provides a battery management self-waking control method based on the battery management self-waking control circuit of the above-mentioned implementation manners. Figure 10 The implementation flowchart of the battery management self-waking control method provided by the embodiment of the present application is shown as ​ The method comprises the following steps.

[0160] Step 101: collecting the charging and discharging current of the battery.

[0161] Step 102: determining whether the charging and discharging current is the charging current or the discharging current.

[0162] Step 103: when the first current is the charging current, comparing the charging current with the first preset threshold value to obtain a first comparison result, and controlling the battery management system to wake up or sleep based on the first comparison result.

[0163] Step 104: when the first current is the discharging current, comparing the discharging current with the second preset threshold value to obtain a second comparison result, and controlling the battery management system to wake up or sleep based on the second comparison result.

[0164] In the embodiment, the charging and discharging current of the battery loop of the vehicle is collected by the current collection module 11 in the control circuit, which can be the charging current of the external power supply charging the battery or the discharging current of the battery supplying power to each load of the vehicle, then the charging and discharging current is distinguished as charging current or discharging current by the current direction distinguishing module 12, and then the size of the current charging or discharging current is determined by the current wake-up determination module 13, so as to control the battery management system to wake up or sleep based on the determination result.

[0165] The embodiment of the application provides a battery management self-waking control method, which is realized based on a battery management self-waking control circuit. The control circuit comprises a current collection module, a current direction distinguishing module, a current wake-up determination module and a reference voltage module. The charging and discharging current of the battery is collected by the current collection module. At this time, it is difficult to determine whether the current of the battery is charging current or discharging current. Therefore, the current direction distinguishing module is arranged to distinguish the charging or discharging direction of the charging and discharging current of the battery. Then the charging or discharging current of the battery after distinguishing the direction is compared with the corresponding preset threshold value by the current wake-up determination module, and the battery management system is woken up or controlled to sleep based on the comparison result. The reference voltage module is used to provide reference voltage for the current threshold comparison of the current wake-up determination module. In this way, based on the accurately distinguished charging current and discharging current and the size of each, it can be determined whether the current battery supplies power to the load or whether the external power supply charges the battery, and then the automatic control of the battery management system wake-up and sleep can be realized according to the determination result, so as to effectively reduce the static power consumption of the battery management system, and avoid the problem that the vehicle cannot be started due to power loss when the vehicle is placed for a long time, and also prolong the service life of the battery.

[0166] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the application.

[0167] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit it; although the foregoing embodiments of the present application have been described in detail, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A battery management self-wake-up control circuit, characterized in that, include: The module includes a current acquisition module, a current direction differentiation module, a current wake-up determination module, and a reference voltage module. The first terminal of the current acquisition module is connected to the negative terminal of the battery, the second terminal is grounded, the third terminal is connected to the first terminal of the reference voltage module, the fourth terminal is connected to the second terminal of the reference voltage module, and the fifth terminal is connected to the first terminal of the current direction differentiation module, which is used to acquire the charging and discharging current of the battery. The second terminal of the current direction differentiation module is connected to the first terminal of the reference voltage module, the third terminal is connected to the second terminal of the reference voltage module, the fourth terminal is connected to the first terminal of the current wake-up determination module, and the fifth terminal is grounded, which is used to differentiate the charging or discharging direction of the battery's charging and discharging current. The second terminal of the current wake-up determination module is connected to the first terminal of the reference voltage module, the third terminal is connected to the second terminal of the reference voltage module, the fourth terminal is connected to the battery management system as the output terminal of the current wake-up determination module, and the fifth terminal is grounded. It is used to compare the charging current or discharging current of the battery after direction differentiation with the corresponding preset threshold, and control the battery management system to wake up or go into sleep based on the corresponding comparison result. The third terminal of the reference voltage module is grounded and used to provide a reference voltage for the current wake-up determination module to perform current threshold comparison.

2. The battery management self-wake-up control circuit according to claim 1, characterized in that, The current direction differentiation module includes: a charging current differentiation circuit and a discharging current differentiation circuit; The first terminal of the charging current differentiation circuit is connected to the fifth terminal of the current acquisition module, the second terminal is connected to the first terminal of the reference voltage module, the third terminal is connected to the first terminal of the current wake-up determination module, and the fourth terminal is grounded, which is used to differentiate the charging current in the direction of battery charging. The first terminal of the discharge current differentiation circuit is connected to the fifth terminal of the current acquisition module, the second terminal is connected to the first terminal of the reference voltage module, the third terminal is connected to the second terminal of the reference voltage module, the fourth terminal is connected to the first terminal of the current wake-up determination module, and the fifth terminal is grounded, which is used to differentiate the discharge current in the direction of battery discharge.

3. The battery management self-wake-up control circuit according to claim 2, characterized in that, The charging current differentiation circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, and a first operational amplifier; One end of the first resistor is connected to the fifth terminal of the current acquisition module, and the other end is connected to the inverting input terminal of the first operational amplifier, one end of the second resistor, and one end of the first capacitor, respectively. After the other end of the second resistor is connected to the other end of the first capacitor, it is connected to the output terminal of the first operational amplifier, serving as the third terminal of the charging current differentiation circuit; One end of the third resistor is connected to the first end of the reference voltage module, and the other end is connected to one end of the fourth resistor and the non-inverting input of the first operational amplifier; The other end of the fourth resistor is grounded.

4. The battery management self-wake-up control circuit according to claim 2, characterized in that, The discharge current differentiation circuit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor, a third capacitor, and a second operational amplifier; One end of the fifth resistor is connected to the fifth terminal of the current acquisition module, and the other end is connected to one end of the sixth resistor and the non-inverting input terminal of the second operational amplifier; The other end of the sixth resistor is grounded; One end of the seventh resistor is connected to the first end of the reference voltage module, and the other end is connected to the inverting input of the second operational amplifier, one end of the eighth resistor, and one end of the second capacitor, respectively. The positive voltage power supply terminal of the second operational amplifier is connected to one end of the third capacitor and the second terminal of the reference voltage module, while the negative voltage power supply terminal is grounded. The other end of the third capacitor is grounded. The other end of the eighth resistor and the other end of the second capacitor are connected together and then connected to the output terminal of the second operational amplifier, serving as the fourth terminal of the discharge current differentiation circuit.

5. The battery management self-wake-up control circuit according to any one of claims 2 to 4, characterized in that, The current wake-up determination module includes: a charging current wake-up determination circuit and a discharging current wake-up determination circuit. The first terminal of the charging current wake-up determination circuit is connected to the third terminal of the charging current differentiation circuit, the second terminal is connected to the first terminal of the reference voltage module, the third terminal is connected to the second terminal of the reference voltage module, the fourth terminal is the output terminal of the charging current wake-up determination circuit and connected to the battery management system, and the fifth terminal is grounded. It is used to compare the charging current of the battery after direction differentiation with the first preset threshold to obtain the first comparison result, and control the battery management system to wake up or go into sleep based on the first comparison result. The first terminal of the discharge current wake-up determination circuit is connected to the fourth terminal of the discharge current differentiation circuit, the second terminal is connected to the first terminal of the reference voltage module, the third terminal is connected to the battery management system as the output terminal of the discharge current wake-up determination circuit, and the fourth terminal is grounded. It is used to compare the discharge current of the battery after direction differentiation with the second preset threshold to obtain the second comparison result, and control the battery management system to wake up or go into sleep based on the second comparison result.

6. The battery management self-wake-up control circuit according to claim 5, characterized in that, The charging current wake-up determination circuit includes: a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a fourth capacitor, a fifth capacitor, a third operational amplifier, and a first diode; One end of the ninth resistor is connected to the third terminal of the charging current differentiation circuit, and the other end is connected to one end of the tenth resistor and the non-inverting input terminal of the third operational amplifier. The other end of the tenth resistor is connected to the output terminal of the third operational amplifier and one end of the eleventh resistor; The other end of the eleventh resistor is connected to one end of the fourth capacitor and one end of the first diode; The other end of the first diode is connected to the battery management system as the output terminal of the charging current wake-up determination circuit. The other end of the fourth capacitor is grounded; One end of the twelfth resistor is connected to the first terminal of the reference voltage module, and the other end is connected to the inverting input terminal of the third operational amplifier; The positive voltage power supply terminal of the third operational amplifier is connected to the second terminal of the reference voltage module and one terminal of the fifth capacitor, while the negative voltage power supply terminal is grounded. The other end of the fifth capacitor is grounded.

7. The battery management self-wake-up control circuit according to claim 5, characterized in that, The discharge current wake-up determination circuit includes: a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a sixth capacitor, a fourth operational amplifier, and a second diode; One end of the thirteenth resistor is connected to the fourth terminal of the discharge current differentiation circuit, and the other end is connected to one end of the fourteenth resistor and the non-inverting input terminal of the fourth operational amplifier. The other end of the fourteenth resistor is connected to the output of the fourth operational amplifier, and then connected to one end of the fifteenth resistor; The other end of the fifteenth resistor is connected to one end of the sixth capacitor and one end of the second diode; The other end of the second diode is connected to the battery management system as the output terminal of the discharge current wake-up determination circuit. The other end of the sixth capacitor is grounded; One end of the sixteenth resistor is connected to the first terminal of the reference voltage module, and the other end is connected to the inverting input terminal of the fourth operational amplifier.

8. The battery management self-wake-up control circuit according to claim 1, characterized in that, The current acquisition module includes: a shunt, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a fifth operational amplifier; The first end of the shunt is connected to the negative terminal of the battery, the second end is grounded, the third end is connected to one end of the seventeenth resistor, and the fourth end is connected to one end of the eighteenth resistor. The other end of the seventeenth resistor is connected to one end of the seventh capacitor, one end of the ninth capacitor, one end of the tenth capacitor, one end of the twentieth resistor, and the inverting input of the fifth operational amplifier, respectively. The other end of the seventh capacitor is grounded; After the other end of the tenth capacitor is connected to the other end of the twentieth resistor, it is connected to the output terminal of the fifth operational amplifier and one end of the twentieth eleventh resistor. The other end of the eighteenth resistor is connected to one end of the eighth capacitor, the other end of the ninth capacitor, one end of the nineteenth resistor, and the non-inverting input of the fifth operational amplifier; The other end of the eighth capacitor is grounded. The other end of the nineteenth resistor is connected to the first end of the reference voltage module; The other end of the 21st resistor is connected to one end of the 12th capacitor, which serves as the fifth terminal of the current acquisition module. The other end of the twelfth capacitor is grounded; The positive voltage power supply terminal of the fifth operational amplifier is connected to the second terminal of the reference voltage module and one terminal of the eleventh capacitor, while the negative voltage power supply terminal is grounded. The other end of the eleventh capacitor is grounded.

9. The battery management self-wake-up control circuit according to claim 1, characterized in that, The reference voltage module includes: a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a twenty-second resistor, and a voltage reference chip; One end of the thirteenth capacitor is connected to one end of the fourteenth capacitor, one end of the twenty-second resistor, and the power input terminal of the voltage reference chip, and serves as the second terminal of the reference voltage module. The other end is connected to the other end of the fourteenth capacitor and then grounded. The other end of the 22nd resistor is connected to the enable terminal of the voltage reference chip; The ground terminal of the voltage reference chip is grounded, and the reference voltage source terminal is connected to one end of the fifteenth capacitor and one end of the sixteenth capacitor, thus serving as the first terminal of the reference voltage module. The other end of the fifteenth capacitor is connected to the other end of the sixteenth capacitor and then grounded.

10. A control method for battery management self-wake-up, characterized in that, Based on the battery management self-wake-up control circuit according to any one of claims 1 to 9, the method includes: Collect the charging and discharging current of the battery; Determine whether the charging / discharging current is a charging current or a discharging current; When the charging and discharging current is the charging current, the charging current is compared with a first preset threshold to obtain a first comparison result, and the battery management system is controlled to wake up or go into sleep mode based on the first comparison result; When the charging / discharging current is the discharging current, the discharging current is compared with a second preset threshold to obtain a second comparison result, and the battery management system is controlled to wake up or go into sleep mode based on the second comparison result.

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