Lithium thionyl chloride battery passivation detection circuit
By designing a lithium sub-battery passivation detection circuit including capacitors, diodes and MOS tubes, wireless communication failures and controller reset problems caused by lithium sub-battery passivation are solved, and effective detection and activation of lithium sub-battery is achieved, and the service life of the equipment is extended.
Patent Information
- Application Number
- CN202421656644.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-12
AI Technical Summary
In the prior art, lithium sub-batteries are easily passivated under long working hours, resulting in wireless communication failure or controller reset, and lack of effective detection and activation methods.
A lithium sub-battery passivation detection circuit is designed, including capacitors, diodes, MOS tubes and controllers. Through the cooperation of capacitors and diodes, passivation detection of lithium sub-batteries is realized, and the lithium sub-batteries are activated through pulse discharge.
Effectively detect the passivation state of lithium sub-batteries, and activate the battery through de-passivation operation, extend the battery life and improve the service life of smart water meters and other equipment.
Smart Images
Figure CN222882810U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of battery detection, and in particular to a lithium-ion battery passivation detection circuit. Background Art
[0002] Lithium thionyl chloride batteries (referred to as lithium-thionyl chloride batteries) have the advantages of high energy density, wide temperature range, long life and low self-discharge rate, and are widely used in various instruments and meters. For example, lithium-thionyl chloride batteries are also widely used in smart water meters.
[0003] In the prior art, smart water meters generally use non-magnetic sampling, magnetic sampling or ultrasonic sampling to achieve accurate measurement, and use wireless communication methods such as NB-IoT, CAT1, Lora, etc. to achieve remote data transmission. The metering power consumption of smart water meters is relatively low, generally between a few uA and tens of uA. Wireless communication is generally once a day, and the power consumption will have a peak current of hundreds of mA to more than 1A. When lithium-ion batteries work for a long time under the above conditions, passivation is very likely to occur. When the lithium-ion battery is passivated, the lithium-ion battery cannot provide enough current, which will cause the wireless communication to fail. Even the instantaneous high current when starting the wireless communication will lower the voltage of the lithium-ion battery, which will cause the controller to reset.
[0004] Therefore, how to provide a detection circuit that can detect the passivation of a lithium-ion battery and activate the lithium-ion battery is a technical problem that needs to be solved urgently in the art. Utility Model Content
[0005] In order to solve the deficiencies of the prior art, the purpose of the present application is to provide a lithium-substrate battery passivation detection circuit, which can detect the passivation of the lithium-substrate battery and activate the lithium-substrate battery.
[0006] To achieve the above objectives, this application adopts the following technical solutions:
[0007] A lithium-ion battery passivation detection circuit comprises a capacitor, a first diode, a first MOS tube, a second MOS tube, a discharge resistor, a first resistor, a second resistor and a controller, wherein the anode of the first diode is electrically connected to the anode of the lithium-ion battery, one end of the first resistor and one end of the discharge resistor respectively, the cathode of the lithium-ion battery is grounded, the other end of the first resistor is electrically connected to one end of the second resistor, the other end of the discharge resistor is electrically connected to the other end of the second resistor, the end of the second resistor electrically connected to the discharge resistor is also electrically connected to the drain of the first MOS tube, the source of the first MOS tube is grounded, and the first MOS The gate of the tube is electrically connected to the controller, and the controller is also electrically connected to the first resistor and one end of the second resistor; the cathode of the first diode is electrically connected to the anode of the capacitor and the drain of the second MOS tube respectively, the other end of the capacitor is grounded, the gate of the second MOS tube is electrically connected to the controller, and the source of the second MOS tube is electrically connected to the anode of the first diode; the controller includes a first control pin, a second control pin and a first detection pin, the first control pin is electrically connected to the gate of the first MOS tube, the second control pin is electrically connected to the gate of the second MOS tube, and the first detection pin is electrically connected to the first resistor and one end of the second resistor.
[0008] Further, the first MOS tube is an NMOS tube, the second MOS tube is a PMOS tube, the resistance value of the first resistor is greater than the resistance value of the discharge resistor, and the resistance value of the second resistor is greater than the resistance value of the discharge resistor.
[0009] Furthermore, the lithium-substrate battery passivation detection circuit also includes a third resistor, a fourth resistor and a third MOS tube, one end of the third resistor is electrically connected to the anode of the capacitor, the other end of the third resistor is electrically connected to one end of the fourth resistor, the other end of the fourth resistor is electrically connected to the drain of the third MOS tube, the gate of the third MOS tube is electrically connected to the controller, the source of the third MOS tube is grounded, and the controller is also electrically connected to the third resistor and one end of the fourth resistor.
[0010] Further, the controller includes a third control pin and a second detection pin, the third control pin is electrically connected to the gate of the third MOS tube, and the second detection pin is electrically connected to the third resistor and one end of the fourth resistor.
[0011] Furthermore, the lithium-substrate battery passivation detection circuit also includes a second diode and a power supply circuit, the anode of the second diode is electrically connected to the power supply circuit, and the cathode of the second diode is electrically connected to the cathode of the first diode.
[0012] Furthermore, the lithium-substrate battery passivation detection circuit also includes a first pull-down resistor, one end of the first pull-down resistor is electrically connected to the gate of the first MOS tube, and the other end of the first pull-down resistor is electrically connected to the source of the first MOS tube.
[0013] Furthermore, the lithium-substrate battery passivation detection circuit also includes a pull-up resistor, one end of the pull-up resistor is electrically connected to the source of the second MOS tube, and the other end of the pull-up resistor is electrically connected to the gate of the second MOS tube.
[0014] Furthermore, the lithium-substrate battery passivation detection circuit also includes a second pull-down resistor, one end of the second pull-down resistor is electrically connected to the source of the third MOS tube, and the other end of the second pull-down resistor is electrically connected to the gate of the third MOS tube.
[0015] Furthermore, the controller also includes an acoustic and optical module. When the voltage detected by the first detection pin is less than the preset passivation voltage and / or the voltage detected by the second detection pin is less than the preset undervoltage voltage, the acoustic and optical module performs an alarm action; when the voltage detected by the first detection pin is greater than or equal to the preset passivation voltage, the acoustic and optical module performs a first action; when the voltage detected by the second detection pin is greater than or equal to the preset undervoltage voltage, the acoustic and optical module performs a second action.
[0016] Furthermore, the sound and light module includes at least one sound-emitting element and at least one light-emitting element.
[0017] The above-mentioned lithium-substrate battery passivation detection circuit can realize the passivation detection of the lithium-substrate battery through the cooperation between the capacitor, the first diode, the first MOS tube, the second MOS tube and the controller, and can activate the lithium-substrate battery, thereby realizing the depassivation operation of the lithium-substrate battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a first schematic diagram of a lithium-substrate battery passivation detection circuit provided in an embodiment of the present application.
[0019] Figure 2 This is a second schematic diagram of a lithium-ion battery passivation detection circuit provided in an embodiment of the present application.
[0020] Figure 3 This is a third schematic diagram of the lithium-substrate battery passivation detection circuit provided in an embodiment of the present application.
[0021] Figure 4 This is a fourth schematic diagram of the lithium-substrate battery passivation detection circuit provided in an embodiment of the present application.
[0022] Figure 5 This is a fifth schematic diagram of a lithium-substrate battery passivation detection circuit provided in an embodiment of the present application.
[0023] Figure 6 A schematic diagram of a controller of a lithium-ion battery passivation detection circuit provided in an embodiment of the present application. DETAILED DESCRIPTION
[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the specific implementation manner of the present application will be clearly and completely described below in conjunction with the drawings in the implementation manner of the present application.
[0025] It should be noted that the words “first”, “second” and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as “one” or “an” do not indicate a quantitative limitation, but rather indicate the existence of at least one. Words such as “include” or “comprise” and similar terms mean that the elements or objects appearing before “include” or “comprises” include the elements or objects listed after “include” or “comprises” and their equivalents, and do not exclude other elements or objects. Words such as “connected” or “connected” and similar terms are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.
[0026] The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.
[0027] like Figure 1 As shown, the present application provides a lithium-ion battery passivation detection circuit 100, which includes a capacitor 11, a first diode 12, a first MOS transistor 13, a second MOS transistor 14, a discharge resistor 15, a first resistor 16, a second resistor 17 and a controller 18, wherein the anode of the first diode 12 is electrically connected to the anode of the lithium-ion battery 10, one end of the first resistor 16 and one end of the discharge resistor 15, respectively, the cathode of the lithium-ion battery 10 is grounded, the other end of the first resistor 16 is electrically connected to one end of the second resistor 17, the other end of the discharge resistor 15 is electrically connected to the other end of the second resistor 17 The first MOS tube 13 is electrically connected to the discharge resistor 15, the gate of the first MOS tube 13 is electrically connected to the controller 18, and the controller 18 is also electrically connected to the first resistor 16 and one end of the second resistor 17; the cathode of the first diode 12 is electrically connected to the anode of the capacitor 11 and the drain of the second MOS tube 14 respectively, the other end of the capacitor 11 is grounded, the gate of the second MOS tube 14 is electrically connected to the controller 18, and the source of the second MOS tube 14 is electrically connected to the anode of the first diode 12.
[0028] Among them, the first MOS tube 13 is an NMOS tube, the second MOS tube 14 is a PMOS tube, the resistance value of the first resistor 16 is greater than the resistance value of the discharge resistor 15, and the resistance value of the second resistor 17 is greater than the resistance value of the discharge resistor 15; the controller 18 can be a device such as a PLC (Programmable Logic Controller) that can realize control and calculation.
[0029] Through the above configuration, the lithium-ion battery 10 can provide electrical energy to the capacitor 11 through the first diode 12, so that electrical energy is stored in the capacitor 11. Specifically, when the controller 18 is powered on, the level of the gate of the second MOS tube 14 input by the controller 18 is low, so that the second MOS tube 14 is in an open state, so that the lithium-ion battery 10 can continuously charge the capacitor 11. Among them, the capacitor 11 is a large-capacity capacitor, generally a Lafarge capacitor; the second MOS tube 14 being in an open state means that the second MOS tube 14 is in a conducting state.
[0030] The working principle of the lithium-ion battery passivation detection circuit 100 for passivation detection is as follows:
[0031] First, in order to avoid affecting the passivation detection of the lithium-ion battery 10, it is necessary to stop the lithium-ion battery 10 from charging the capacitor 11. Specifically, the level of the gate of the second MOS tube 14 input by the controller 18 is a high level, so that the second MOS tube 14 is in a closed state. At this time, the capacitor 11 provides power for the lithium-ion battery passivation detection circuit 100, and due to the presence of the first diode 12, the lithium-ion battery 10 will stop charging the capacitor 11. Among them, the second MOS tube 14 is in a closed state means that the second MOS tube 14 is in a turned-off state.
[0032] Secondly, the level of the gate of the first MOS tube 13 input by the controller 18 is a high level, so that the first MOS tube 13 is in an open state. Among them, the first MOS tube 13 being in an open state means that the first MOS tube 13 is in a conducting state. At this time, the lithium-ion battery 10 is discharged through the first resistor 16, the second resistor 17 and the discharge resistor 15. Since the resistance values of the first resistor 16 and the second resistor 17 are both greater than the resistance value of the discharge resistor 15, the first resistor 16 and the second resistor 17 are sampling voltage-dividing resistors, and the discharge resistor 15 is the main discharge resistor of the lithium-ion battery 10, so that the controller 18 can sample the voltage between the first resistor 16 and the second resistor 17.
[0033] Finally, a preset passivation voltage is defined, and the preset passivation voltage can be adjusted according to actual needs. During the time T1 when the controller 18 controls the first MOS tube 13 to be in the open state, if the controller 18 samples the voltage between the first resistor 16 and the second resistor 17, and the voltage calculated by the controller 18 is less than the preset passivation voltage, the controller 18 determines that the lithium-ion battery 10 is in the passivation state at this time; if the controller 18 samples the voltage between the first resistor 16 and the second resistor 17, and the voltage calculated by the controller 18 is greater than or equal to the preset passivation voltage, the controller 18 determines that the lithium-ion battery 10 is in a normal state at this time. Among them, the unit of time T1 is generally set to ms, and time T1 can be adjusted according to actual conditions.
[0034] In this embodiment, if the controller 18 determines that the lithium-ion battery 10 is in a passivation state, the controller 18 records and reports the passivation information of the lithium-ion battery 10 to an external device to remind the operator of the current state of the lithium-ion battery 10 .
[0035] As an implementation method, when the lithium-substrate battery 10 is in a passivated state, the present application performs a depassivation operation on the passivated lithium-substrate battery 10 by means of pulse discharge.
[0036] Specifically, an interval time T2 and an activation time T3 are defined, the unit of the interval time T2 is generally set to s, the unit of the activation time T3 is generally set to min, and the interval time T2 and the activation time T3 can be adjusted according to actual conditions.
[0037] The controller 18 outputs a high level to the gate of the first MOS tube 13 at intervals T2, and keeps the first MOS tube 13 in an open state during the activation time T3, thereby realizing the discharge of the lithium-ion battery 10. At the same time, the controller 18 samples the voltage between the first resistor 16 and the second resistor 17 until the voltage sampled by the controller 18 is greater than or equal to the preset passivation voltage, at which time the depassivation operation of the lithium-ion battery 10 is completed.
[0038] The above-mentioned pulse discharge method can be beneficial to the depassivation of the lithium-sub battery 10 , thereby improving the depassivation efficiency of the lithium-sub battery 10 .
[0039] In addition, through the above depassivation operation, the lithium-ion battery 10 can be activated when the lithium-ion battery 10 is in a passivated state, thereby increasing the service life of the lithium-ion battery 10, and further increasing the service life of the meter equipped with the lithium-ion battery 10. For example, the above arrangement can increase the service life of a smart water meter.
[0040] like Figure 2As shown, in the present application, the controller 18 includes a first control pin 181, a second control pin 182 and a first detection pin 183, the first control pin 181 is electrically connected to the gate of the first MOS tube 13, the second control pin 182 is electrically connected to the gate of the second MOS tube 14, and the first detection pin 183 is electrically connected to one end of the first resistor 16 and the second resistor 17. Among them, the first detection pin 183 is used to sample the voltage between the first resistor 16 and the second resistor 17, so as to realize the voltage sampling of the controller 18; the first control pin 181 is used to output a low level to the first MOS tube 13, so that the first MOS tube 13 is in a closed state, and the first control pin 181 can also be used to output a high level to the first MOS tube 13, so that the first MOS tube 13 is in an open state; the second control pin 182 is used to output a low level to the second MOS tube 14, so that the second MOS tube 14 is in an open state, and the second control pin 182 can also be used to output a high level to the second MOS tube 14, so that the second MOS tube 14 is in a closed state. The first MOS transistor 13 being in a closed state means that the first MOS transistor 13 is in a turned-off state.
[0041] It should be noted that, due to individual differences in the lithium-ion battery 10 after passivation, different lithium-ion batteries 10 require different activation times for depassivation, but the electric energy stored in the capacitor 11 cannot support the operation of the lithium-ion battery passivation detection circuit 100 for a long time. Therefore, the lithium-ion battery passivation detection circuit 100 provided in the present application can also detect whether the capacitor 11 is undervoltage, that is, the lithium-ion battery passivation detection circuit 100 provided in the present application can also detect whether the electric energy of the capacitor 11 is sufficient. A preset undervoltage voltage is defined. When the voltage of the capacitor 11 is less than the preset undervoltage voltage, the capacitor 11 is in an undervoltage state, that is, the electric energy of the capacitor 11 is insufficient.
[0042] like Figure 3 As shown, specifically, the lithium-substrate battery passivation detection circuit 100 also includes a third resistor 19, a fourth resistor 21 and a third MOS tube 22, one end of the third resistor 19 is electrically connected to the anode of the capacitor 11, the other end of the third resistor 19 is electrically connected to one end of the fourth resistor 21, the other end of the fourth resistor 21 is electrically connected to the drain of the third MOS tube 22, the gate of the third MOS tube 22 is electrically connected to the controller 18, the source of the third MOS tube 22 is grounded, and the controller 18 is also electrically connected to one end of the third resistor 19 and the fourth resistor 21. Among them, the third MOS tube 22 is an NMOS tube.
[0043] In the depassivation operation of the lithium-ion battery 10, the controller 18 outputs a high level to the gate of the third MOS tube 22, so that the third MOS tube 22 is in an open state. Among them, the third MOS tube 22 is in an open state means that the third MOS tube 22 is in a conducting state. When the third MOS tube 22 is in an open state, the controller 18 samples the voltage between the third resistor 19 and the fourth resistor 21. If the voltage sampled by the controller 18 between the third resistor 19 and the fourth resistor 21 is less than the preset undervoltage voltage, the controller 18 determines that the capacitor 11 is in an undervoltage state, and the controller 18 records and reports the undervoltage information of the capacitor 11 to an external device to remind the operator of the current state of the capacitor 11. If the voltage sampled by the controller 18 between the third resistor 19 and the fourth resistor 21 is greater than or equal to the preset undervoltage voltage, the controller 18 determines that the capacitor 11 is in a non-undervoltage state, and the electrical energy of the capacitor 11 can continue to power the lithium-ion battery passivation detection circuit 100.
[0044] In this embodiment, the controller 18 includes a third control pin 184 and a second detection pin 185, the third control pin 184 is electrically connected to the gate of the third MOS tube 22, and the second detection pin 185 is electrically connected to one end of the third resistor 19 electrically connected to the fourth resistor 21. Among them, the second detection pin 185 is used to sample the voltage between the third resistor 19 and the fourth resistor 21, so as to realize the voltage sampling of the controller 18; the third control pin 184 is used to output a low level to the third MOS tube 22, so that the third MOS tube 22 is in a closed state, and the third control pin 184 can also be used to output a high level to the third MOS tube 22, so that the third MOS tube 22 is in an open state. Among them, the third MOS tube 22 is in a closed state means that the third MOS tube 22 is in a turned-off state.
[0045] It should be noted that when the capacitor 11 is in an undervoltage state, the power of the capacitor 11 cannot meet the power supply requirement of the lithium-ion battery passivation detection circuit 100. Figure 4 As shown, the lithium-ion battery passivation detection circuit 100 of the present application further includes a second diode 23 and a power supply circuit 24, wherein the anode of the second diode 23 is electrically connected to the power supply circuit 24, and the cathode of the second diode 23 is electrically connected to the cathode of the first diode 12. Through the above configuration, the lithium-ion battery passivation detection circuit 100 of the present application can provide electric energy to the capacitor 11 through the power supply circuit 24 when the capacitor 11 is in an undervoltage state, so that the capacitor 11 can continue to supply power to the lithium-ion battery passivation detection circuit 100, and further, the lithium-ion battery passivation detection circuit 100 can continue to perform a depassivation operation on the lithium-ion battery 10 to achieve the depassivation of the lithium-ion battery 10. Among them, the power supply circuit 24 can be an external power supply, and its voltage is 3.6V to meet the charging demand of the capacitor 11.
[0046] like Figure 5 As shown, as an implementation, the lithium-substrate battery passivation detection circuit 100 further includes a first pull-down resistor 25, one end of the first pull-down resistor 25 is electrically connected to the gate of the first MOS transistor 13, and the other end of the first pull-down resistor 25 is electrically connected to the source of the first MOS transistor 13. Through the above configuration, when powered on, a certain voltage can be given to the gate of the first MOS transistor 13 through the first pull-down resistor 25, so as to prevent interference caused by the uncertain level of the gate of the first MOS transistor 13 when powered on, thereby facilitating the improvement of the voltage stability of the first MOS transistor 13.
[0047] The lithium-ion battery passivation detection circuit 100 further includes a pull-up resistor 26, one end of which is electrically connected to the source of the second MOS transistor 14, and the other end of which is electrically connected to the gate of the second MOS transistor 14. Through the above arrangement, when powered on, a certain voltage can be given to the gate of the second MOS transistor 14 through the pull-up resistor 26, so as to prevent interference caused by the uncertain level of the gate of the second MOS transistor 14 when powered on, thereby facilitating the improvement of the voltage stability of the second MOS transistor 14.
[0048] The lithium-ion battery passivation detection circuit 100 further includes a second pull-down resistor 27, one end of which is electrically connected to the source of the third MOS tube 22, and the other end of which is electrically connected to the gate of the third MOS tube 22. Through the above arrangement, when powered on, a certain voltage can be given to the gate of the third MOS tube 22 through the second pull-down resistor 27, so as to prevent interference caused by the uncertain level of the gate of the third MOS tube 22 when powered on, thereby facilitating the improvement of the voltage stability of the third MOS tube 22.
[0049] like Figure 6 As shown, as an optional implementation, the controller 18 also includes an acoustic and optical module 186. When the voltage detected by the first detection pin 183 is less than the preset passivation voltage and / or the voltage detected by the second detection pin 185 is less than the preset undervoltage voltage, the acoustic and optical module 186 performs an alarm action; when the voltage detected by the first detection pin 183 is greater than or equal to the preset passivation voltage, the acoustic and optical module 186 performs a first action; when the voltage detected by the second detection pin 185 is greater than or equal to the preset undervoltage voltage, the acoustic and optical module 186 performs a second action. Among them, the alarm action refers to the acoustic and optical module 186 emitting a first sound (such as an alarm sound, etc.) and a first light (such as a flashing red light, etc.), thereby reminding the operator that the lithium-ion battery 10 has been passivated and / or the capacitor 11 is in an undervoltage state; the first action refers to the acoustic and optical module 186 having no reaction or emitting a second light (such as a green light that is always on, etc.); the second action may be consistent with the first action, or inconsistent with the first action, and this application does not limit it.
[0050] It should be noted that, when the depassivation operation of the lithium-ion battery 10 is completed, the sound and light module 186 can also emit sound and / or light to remind the operator that the depassivation operation of the lithium-ion battery 10 has been completed.
[0051] In this embodiment, the sound and light module 186 includes at least one sound element 1861 and at least one light emitting element 1862. Specifically, the sound element 1861 can be an audio element such as a speaker or a sound, and the light emitting element 1862 can be an indicator light element such as an LED lamp. This application does not limit the sound element 1861 and the light emitting element 1862.
[0052] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application.
Claims
1. A lithium-ion battery passivation detection circuit, characterized in that: The lithium-ion battery passivation detection circuit includes a capacitor, a first diode, a first MOS tube, a second MOS tube, a discharge resistor, a first resistor, a second resistor and a controller. The anode of the first diode is electrically connected to the anode of the lithium-substrate battery, one end of the first resistor and one end of the discharge resistor respectively, the cathode of the lithium-substrate battery is grounded, the other end of the first resistor is electrically connected to one end of the second resistor, the other end of the discharge resistor is electrically connected to the other end of the second resistor, the end of the second resistor electrically connected to the discharge resistor is also electrically connected to the drain of the first MOS tube, the source of the first MOS tube is grounded, the gate of the first MOS tube is electrically connected to the controller, and the controller is also electrically connected to the first resistor and one end of the second resistor; The cathode of the first diode is electrically connected to the anode of the capacitor and the drain of the second MOS transistor respectively, the other end of the capacitor is grounded, the gate of the second MOS transistor is electrically connected to the controller, and the source of the second MOS transistor is electrically connected to the anode of the first diode; The controller includes a first control pin, a second control pin and a first detection pin, the first control pin is electrically connected to the gate of the first MOS tube, the second control pin is electrically connected to the gate of the second MOS tube, and the first detection pin is electrically connected to the first resistor and one end of the second resistor.
2. The lithium-substrate battery passivation detection circuit according to claim 1, characterized in that: The first MOS tube is an NMOS tube, the second MOS tube is a PMOS tube, the resistance value of the first resistor is greater than the resistance value of the discharge resistor, and the resistance value of the second resistor is greater than the resistance value of the discharge resistor.
3. The lithium-substrate battery passivation detection circuit according to claim 2, characterized in that: The lithium-substrate battery passivation detection circuit also includes a third resistor, a fourth resistor and a third MOS tube, one end of the third resistor is electrically connected to the anode of the capacitor, the other end of the third resistor is electrically connected to one end of the fourth resistor, the other end of the fourth resistor is electrically connected to the drain of the third MOS tube, the gate of the third MOS tube is electrically connected to the controller, the source of the third MOS tube is grounded, and the controller is also electrically connected to the third resistor and one end of the fourth resistor.
4. The lithium-substrate battery passivation detection circuit according to claim 3, characterized in that: The controller includes a third control pin and a second detection pin, the third control pin is electrically connected to the gate of the third MOS tube, and the second detection pin is electrically connected to the third resistor and one end of the fourth resistor.
5. The lithium-substrate battery passivation detection circuit according to claim 3, characterized in that: The lithium-subcell passivation detection circuit further includes a second diode and a power supply circuit, wherein an anode of the second diode is electrically connected to the power supply circuit, and a cathode of the second diode is electrically connected to a cathode of the first diode.
6. The lithium-substrate battery passivation detection circuit according to any one of claims 1 to 5, characterized in that: The lithium-substrate battery passivation detection circuit also includes a first pull-down resistor, one end of the first pull-down resistor is electrically connected to the gate of the first MOS tube, and the other end of the first pull-down resistor is electrically connected to the source of the first MOS tube.
7. The lithium-substrate battery passivation detection circuit according to any one of claims 1 to 5, characterized in that: The lithium-substrate battery passivation detection circuit further includes a pull-up resistor, one end of which is electrically connected to the source of the second MOS tube, and the other end of which is electrically connected to the gate of the second MOS tube.
8. The lithium-substrate battery passivation detection circuit according to any one of claims 3 to 5, characterized in that: The lithium-substrate battery passivation detection circuit also includes a second pull-down resistor, one end of the second pull-down resistor is electrically connected to the source of the third MOS tube, and the other end of the second pull-down resistor is electrically connected to the gate of the third MOS tube.
9. The lithium-substrate battery passivation detection circuit according to claim 4, characterized in that: The controller also includes an acousto-optic module. When the voltage detected by the first detection pin is less than a preset passivation voltage and / or the voltage detected by the second detection pin is less than a preset undervoltage voltage, the acousto-optic module performs an alarm action; when the voltage detected by the first detection pin is greater than or equal to the preset passivation voltage, the acousto-optic module performs a first action; when the voltage detected by the second detection pin is greater than or equal to the preset undervoltage voltage, the acousto-optic module performs a second action.
10. The lithium-substrate battery passivation detection circuit according to claim 9, characterized in that: The sound and light module includes at least one sound-generating element and at least one light-emitting element.