CN113295325B - Battery pack pressure monitoring device and method - Google Patents

Battery pack pressure monitoring device and method Download PDF

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Publication number
CN113295325B
CN113295325B CN202110559062.6A CN202110559062A CN113295325B CN 113295325 B CN113295325 B CN 113295325B CN 202110559062 A CN202110559062 A CN 202110559062A CN 113295325 B CN113295325 B CN 113295325B
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monitoring device
pressure monitoring
signal
wake
management system
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CN113295325A (en
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桂贤龙
沈磊
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Shanghai Junqian Sensing Technology Co ltd
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Shanghai Junqian Sensing Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/08—Means for indicating or recording, e.g. for remote indication
    • G01L19/086—Means for indicating or recording, e.g. for remote indication for remote indication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4285—Testing apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The embodiment of the invention discloses a battery pack pressure monitoring device, which is in bidirectional communication with a battery management system so as to realize bidirectional awakening between the pressure monitoring device and the battery management system, and comprises the following steps: the battery management system sends a wake-up signal or a sleep signal to the pressure monitoring device so that the pressure monitoring device enters a wake-up state or a sleep state; and the pressure monitoring device sends a wake-up signal to the battery management system so as to enable the battery management system to enter a wake-up state. The embodiment of the invention discloses a method for monitoring the pressure of a battery pack. The invention adds bidirectional awakening between the pressure monitoring device and the battery management system, and designs a backup circuit for awakening and sleeping circuits.

Description

Battery pack pressure monitoring device and method
Technical Field
The invention relates to the technical field of battery management, in particular to a battery pack pressure monitoring device and method.
Background
The Battery Management System (BMS) is used as a set of control system for protecting the use safety of the power battery, the service state of the battery is monitored all the time, the pressure state in the battery pack is important information, and the early warning capability can be provided for the BMS by monitoring the air pressure in the battery pack, so that the use safety of the battery is improved. After the car is flamed out, need monitor the atmospheric pressure in the battery package, current battery package pressure monitoring device can only realize awakening up BMS's one-way, and can't realize that battery package pressure monitoring device self sleep awakens up, leads to the consumption of device higher, influences the battery continuation of the journey. When the battery package internal gas pressure exceeded the threshold value, current pressure monitoring device awakens up BMS through awakening up the signal line, however when awakening up the signal line and taking place physical fault, will not reach the mesh of awakening up, can't remind BMS, causes the not in place condition of battery monitoring.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a battery pack pressure monitoring apparatus and method, which adds a bidirectional wake-up between the pressure monitoring apparatus and a battery management system, and designs a backup line for wake-up and sleep lines.
The embodiment of the invention provides a battery pack pressure monitoring device, which comprises a main control chip, a pressure sensor and an LIN transceiver, wherein the pressure sensor and the LIN transceiver are connected with the main control chip, and the pressure monitoring device also comprises:
the LIN bus is used for sending a wake-up signal or a sleep signal to the pressure monitoring device by the battery management system and sending the wake-up signal to the battery management system by the pressure monitoring device;
the wake-up signal line is used for sending a wake-up signal to the battery management system by the pressure monitoring device;
a request signal line for the battery management system to send a wake-up signal or a sleep signal to the pressure monitoring device;
two-way communication between pressure monitoring device and the battery management system to realize two-way awakening between pressure monitoring device and the battery management system includes:
the battery management system sends a wake-up signal or a sleep signal to the pressure monitoring device so that the pressure monitoring device enters a wake-up state or a sleep state;
the pressure monitoring device sends a wake-up signal to the battery management system so as to enable the battery management system to enter a wake-up state;
wherein the wake-up signal sent by the battery management system to the pressure monitoring device comprises one or more of a high-level signal sent by the request signal line and a wake-up command sent by the LIN bus;
the sleep signal sent by the battery management system to the pressure monitoring device comprises one or more of a low-level signal sent by the request signal line and a sleep command sent by the LIN bus;
the wake-up signal sent by the pressure monitoring device to the battery management system comprises one or more of a high-level pulse generated by the wake-up signal line and a wake-up command sent by the LIN bus.
As a further improvement of the present invention, after the pressure monitoring device enters the wake-up state, the pressure monitoring device sends a feedback signal to the battery management system, where the feedback signal includes one or more of a wake-up feedback instruction sent by the LIN bus and a high-level pulse generated by the wake-up signal line.
As a further improvement of the present invention, after the pressure monitoring device enters the sleep state, the pressure monitoring device sends a feedback signal to the battery management system, where the feedback signal includes one or more of a sleep feedback instruction sent by the LIN bus and a high-level pulse generated by the wake-up signal line.
As a further improvement of the present invention, after the battery management system enters the wake-up state, the battery management system sends a feedback signal to the pressure monitoring device, where the feedback signal includes one or more of a wake-up feedback instruction sent by the LIN bus and a high-level signal sent by the request signal line.
As a further development of the invention, the LIN bus is also used for the pressure monitoring device to send a real-time monitored gas pressure signal and a corresponding diagnostic signal to the battery management system,
when the air pressure value corresponding to the air pressure signal exceeds a threshold value, the pressure monitoring device sends a diagnosis signal to the battery management system, wherein the diagnosis signal comprises one or more of a LIN diagnosis frame sent by the LIN bus and a PWM wave generated by the wake-up signal line, and the duty ratio of the PWM wave represents the state of the diagnosis signal.
As a further improvement of the present invention, the duty ratio of the PWM wave has a preset correspondence with the diagnostic code corresponding to the diagnostic frame.
As a further improvement of the present invention, the pressure monitoring device includes a working mode, a low power consumption mode and an ultra-low power consumption mode, and the pressure monitoring device switches among the three modes according to a trigger condition;
wherein the content of the first and second substances,
the trigger condition of the working mode comprises a wake-up signal sent by the battery management system;
the triggering condition of the low power consumption mode comprises a sleep signal sent by the battery management system;
the trigger condition of the ultra-low power mode includes a duration time of the low power mode.
As a further improvement of the present invention, in the operating mode, when the pressure monitoring device receives a sleep signal sent by the battery management system, the pressure monitoring device switches to a low power consumption mode;
in the low power consumption mode or the ultra-low power consumption mode, when the pressure monitoring device receives a wake-up signal sent by the battery management system, the pressure monitoring device is switched to the working mode;
in the low power consumption mode, when the continuous operation time of the pressure monitoring device exceeds the preset time, the pressure monitoring device is switched to the ultra-low power consumption mode.
The embodiment of the invention also provides a method for monitoring the pressure of a battery pack, which realizes the bidirectional awakening between a pressure monitoring device and a battery management system through the bidirectional communication between the pressure monitoring device and the battery management system, and comprises the following steps:
the battery management system sends a wake-up signal or a sleep signal to the pressure monitoring device so that the pressure monitoring device enters a wake-up state or a sleep state;
the pressure monitoring device sends a wake-up signal to the battery management system so as to enable the battery management system to enter a wake-up state;
the battery management system sends a wake-up signal to the pressure monitoring device, wherein the wake-up signal sent by the battery management system to the pressure monitoring device comprises one or more of a high-level signal sent by a request signal line and a wake-up command sent by a LIN bus;
the sleep signal sent by the battery management system to the pressure monitoring device comprises one or more of a low-level signal sent by a request signal line and a sleep command sent by a LIN bus;
the wake-up signal sent by the pressure monitoring device to the battery management system comprises one or more of a high-level pulse generated by a wake-up signal line and a wake-up command sent by a LIN bus.
As a further improvement of the present invention, the method further comprises:
after the pressure monitoring device enters the awakening state, the pressure monitoring device sends a feedback signal to the battery management system, wherein the feedback signal comprises one or more of an awakening feedback instruction sent by the LIN bus and a high-level pulse generated by an awakening signal line.
As a further improvement of the present invention, the method further comprises:
after the pressure monitoring device enters a sleep state, the pressure monitoring device sends a feedback signal to the battery management system, wherein the feedback signal comprises one or more of a sleep feedback instruction sent by the LIN bus and a high-level pulse generated by a wake-up signal line.
As a further improvement of the present invention, the method further comprises:
after the battery management system enters the awakening state, the battery management system sends a feedback signal to the pressure monitoring device, wherein the feedback signal comprises one or more of an awakening feedback instruction sent by the LIN bus and a high-level signal sent by a request signal line.
As a further improvement of the present invention, the method further comprises:
the pressure monitoring device sends real-time monitored air pressure signals and corresponding diagnostic signals to the battery management system,
when the air pressure value corresponding to the air pressure signal exceeds a threshold value, the pressure monitoring device sends a diagnosis signal to the battery management system, wherein the diagnosis signal comprises one or more of a LIN diagnosis frame sent by the LIN bus and a PWM wave generated by the wake-up signal line, and the duty ratio of the PWM wave represents the state of the diagnosis signal.
As a further improvement of the present invention, the duty ratio of the PWM wave has a preset correspondence with the diagnostic code corresponding to the diagnostic frame.
As a further improvement of the present invention, the pressure monitoring device comprises an operation mode, a low power consumption mode and an ultra-low power consumption mode, and the method comprises:
switching the pressure monitoring device among three modes according to a trigger condition; wherein the content of the first and second substances,
the trigger condition of the working mode comprises a wake-up signal sent by the battery management system;
the triggering condition of the low power consumption mode comprises a sleep signal sent by the battery management system;
the trigger condition of the ultra-low power mode includes a duration time of the low power mode.
As a further improvement of the present invention, in the operating mode, when the pressure monitoring device receives a sleep signal sent by the battery management system, the pressure monitoring device switches to a low power consumption mode;
in the low power consumption mode or the ultra-low power consumption mode, when the pressure monitoring device receives a wake-up signal sent by the battery management system, the pressure monitoring device is switched to the working mode;
in the low power consumption mode, when the continuous operation time of the pressure monitoring device exceeds the preset time, the pressure monitoring device is switched to the ultra-low power consumption mode.
Embodiments of the present invention further provide an electronic device, which includes a memory and a processor, where the memory is configured to store one or more computer instructions, and the one or more computer instructions are executed by the processor to implement the method.
Embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, the computer program being executed by a processor to implement the method.
The invention has the beneficial effects that: by adding bidirectional awakening between the pressure monitoring device and the battery management system, the battery management system can also control the pressure monitoring device to enter an awakened state or a sleep state, and the power consumption of the pressure monitoring device is reduced. And a backup circuit is designed for the awakening and sleeping circuit, so that the reliability of the pressure monitoring device and the safety of a battery management system are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a pressure monitoring device according to an exemplary embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a correspondence relationship between a LIN diagnostic code and a duty ratio of a PWM wave according to an exemplary embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a state transition relationship between three modes of a pressure monitoring device according to an exemplary embodiment of the present invention;
FIG. 4 is a schematic diagram of a workflow of a pressure monitoring device according to an exemplary embodiment of the present invention;
fig. 5 is a schematic flow chart of a working mode of a pressure monitoring device according to an exemplary embodiment of the present invention;
fig. 6 is a schematic flowchart of a working process of a pressure monitoring device in a low power consumption mode according to an exemplary embodiment of the present invention;
fig. 7 is a schematic flowchart of a working process of a pressure monitoring device in an ultra-low power consumption mode according to an exemplary embodiment of the present invention;
fig. 8 is a schematic flowchart illustrating a working process of the pressure monitoring apparatus when handling an abnormal air pressure event according to an exemplary embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, in the description of the present invention, the terms used are only for illustrative purposes, and are not intended to limit the scope of the present invention. The terms "comprises" and/or "comprising" are used to specify the presence of stated elements, steps, operations, and/or components, but do not preclude the presence or addition of one or more other elements, steps, operations, and/or components. The terms "first," "second," and the like may be used to describe various elements, not necessarily order, and not necessarily limit the elements. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. These terms are only used to distinguish one element from another. These and/or other aspects will become apparent to those of ordinary skill in the art in view of the following drawings, and the description of the embodiments of the present invention will be more readily understood by those of ordinary skill in the art. The drawings are only for purposes of illustrating the described embodiments of the invention. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated in the present application may be employed without departing from the principles described in the present application.
The pressure monitoring device for the battery pack comprises a main control chip, and a pressure sensor and an LIN transceiver which are connected with the main control chip, and further comprises:
the LIN bus is used for sending a wake-up signal or a sleep signal to the pressure monitoring device by the battery management system and sending the wake-up signal to the battery management system by the pressure monitoring device;
the wake-up signal line is used for sending a wake-up signal to the battery management system by the pressure monitoring device;
a request signal line for the battery management system to send a wake-up signal or a sleep signal to the pressure monitoring device;
two-way communication between pressure monitoring device and the battery management system to realize two-way awakening between pressure monitoring device and the battery management system includes:
the battery management system sends a wake-up signal or a sleep signal to the pressure monitoring device so that the pressure monitoring device enters a wake-up state or a sleep state;
the pressure monitoring device sends a wake-up signal to the battery management system so as to enable the battery management system to enter a wake-up state;
wherein the wake-up signal sent by the battery management system to the pressure monitoring device comprises one or more of a high-level signal sent by the request signal line and a wake-up command sent by the LIN bus;
the sleep signal sent by the battery management system to the pressure monitoring device comprises one or more of a low-level signal sent by the request signal line and a sleep command sent by the LIN bus;
the wake-up signal sent by the pressure monitoring device to the battery management system comprises one or more of a high-level pulse generated by the wake-up signal line and a wake-up command sent by the LIN bus.
After the automobile is flamed out, the air pressure in the battery pack needs to be monitored from the safety perspective, and the power consumption problem of the pressure monitoring device is not considered in the prior art. According to the invention, bidirectional awakening is added between the pressure monitoring device and the battery management system, so that the battery management system can also control the pressure monitoring device to enter an awakened state and a sleep state, and the power consumption of the pressure monitoring device can be reduced after the pressure monitoring device enters the sleep state.
The pressure monitoring device is used for monitoring the air pressure value of the battery pack and determining whether to awaken the battery management system according to the air pressure value so that the battery management system can monitor the abnormity of the battery monomer in the battery pack after awakening. The battery management system is used for determining whether to awaken the pressure monitoring device according to a trigger signal (awakening signal/sleep signal) so that the pressure monitoring device monitors the air pressure value of the battery pack after awakening or stops monitoring the air pressure value of the battery pack after sleeping.
As shown in fig. 1, the pressure monitoring device includes a main control chip, and a pressure sensor and a LIN transceiver connected to the main control chip, and the pressure monitoring device further includes:
the LIN bus is used for sending a wake-up signal or a sleep signal to the pressure monitoring device by the battery management system and sending the wake-up signal to the battery management system by the pressure monitoring device;
the wake-up signal line is used for sending a wake-up signal to the battery management system by the pressure monitoring device;
and the request signal line is used for sending a wake-up signal or a sleep signal to the pressure monitoring device by the battery management system.
In an optional embodiment, the pressure monitoring device further includes a voltage stabilizer connected to the main control chip, and a power supply for supplying power to the pressure monitoring device.
The pressure monitoring device selects a MCU (Main control chip) supporting an LIN bus, wherein the LIN (local Interconnect network) bus is a low-cost serial communication protocol based on a UART/SCI (Universal asynchronous receiver/serial interface). As shown in fig. 1, an MCU, a LIN transceiver and a pressure sensor connected to the MCU are disposed on a main control board of the pressure monitoring apparatus. MCU is the core processor of whole device, LIN transceiver with the data conversion that pressure monitoring devices or BMS sent have the rate of conversion control and wave shaping's bus signal to make this bus signal can pass through LIN bus transmission, correspondingly, can design the stabiliser (for example choose LDO), LDO is a low dropout linear regulator, so that external input voltage keeps on its rated value after mediating, LDO can guarantee that the operating time of battery is longer, and the noise is lower simultaneously, pressure sensor is used for the atmospheric pressure value of real-time measurement battery package. Still be provided with a plurality of external function pins on the main control board, wherein, each function pin is as follows: 1. a power supply Vcc; 2. grounding GND; 3. a LIN bus; 4. a wake-up signal; 5. a request signal. Pin 1 and pin 2 provide the power supply function, pin 3 provides the bi-directional communication functions of the BMS and the pressure monitoring device, including the transmission of barometric pressure signals, diagnostic signals, wake-up signals, and sleep signals, pin 4 provides the wake-up function and diagnostic output function of the pressure monitoring device to the BMS, and pin 5 provides the wake-up/sleep function of the BMS to the pressure monitoring device. After the encapsulation, form a plurality of interfaces, one of them interface is power source, connect the power supply, for whole device power supply, an interface is LIN bus interface, connect the LIN bus, in order to realize the two-way communication between BMS and the pressure monitoring device, including pressure monitoring device to the awakening of BMS and the awakening or sleep control of BMS to pressure monitoring device, an interface is awakening signal line interface, connects awakening signal line, in order to realize the awakening of pressure monitoring device to BMS, an interface is the request signal line interface, in order to realize that BMS is to the awakening or sleep control of pressure monitoring device.
It is understood that the BMS may wake up the pressure monitoring device, and the wake-up signal that the BMS wakes up the pressure monitoring device includes: (1) request signal line high level signal, (2) LIN bus sends the wake-up command. The wake-up signal (1) and the wake-up signal (2) may be sent separately. Preferably, the wake-up signal (1) and the wake-up signal (2) are transmitted at the same time and are backup to each other, and both can wake up the pressure monitoring device.
The BMS can let pressure monitor device sleep, and the sleep signal that BMS sent to pressure monitor device includes: (1) request signal line low level, (2) LIN bus sends sleep command. Sleep signals (1) and (2) may be sent separately. Preferably, the sleep signals (1) and (2) are transmitted at the same time and are backup to each other, and both can enable the pressure monitoring device to sleep.
The BMS can also be awakened by the pressure monitoring unit, and the awakening signal for awakening the BMS by the pressure monitoring device comprises: (1) the wake-up signal line generates high level pulses of about 500MS, and (2) the LIN bus sends a wake-up command. The wake-up signal (1) and the wake-up signal (2) may be sent separately. Preferably, the wake-up signal (1) and the wake-up signal (2) are transmitted at the same time, and are backup to each other, and both can wake up the BMS.
In an optional embodiment, after the pressure monitoring device enters the wake-up state, the pressure monitoring device sends a feedback signal to the battery management system, where the feedback signal includes one or more of a wake-up feedback command sent by the LIN bus and a high-level pulse generated by the wake-up signal line.
It is understood that the feedback signal sent by the pressure monitoring device to the BMS after the pressure monitoring device is awakened includes: (1) LIN bus sends wake-up feedback instruction, and (2) wake-up signal line generates high level pulse about 500 MS. The feedback signal (1) and the feedback signal (2) may be transmitted separately. Preferably, the feedback signal (1) and the feedback signal (2) are transmitted at the same time and are backup to each other, and both can be used as feedback signals.
In an optional embodiment, after the pressure monitoring device enters the sleep state, the pressure monitoring device sends a feedback signal to the battery management system, where the feedback signal includes one or more of a sleep feedback command sent by the LIN bus and a high-level pulse generated by the wake-up signal line.
It is understood that the feedback signal transmitted to the BMS after the pressure monitoring device receives the sleep signal includes: (1) the LIN bus sends sleep feedback, and (2) the wake-up signal line generates high-level pulses of about 500 MS. The feedback signals (1) and (2) may be sent separately. Preferably, the feedback signal (1) and the feedback signal (2) are transmitted at the same time and are backup to each other, and both can be used as feedback signals.
In an optional embodiment, after the battery management system enters the wake-up state, the battery management system sends a feedback signal to the pressure monitoring device, where the feedback signal includes one or more of a wake-up feedback instruction sent by the LIN bus and a high-level signal sent by the request signal line.
It is understood that the feedback signal sent by the BMS to the pressure monitoring device after the BMS is awakened includes: (1) the LIN bus sends a wake-up feedback instruction, and (2) requests the signal line to be at a high level. The feedback signal (1) and the feedback signal (2) may be transmitted separately. Preferably, the feedback signal (1) and the feedback signal (2) are transmitted at the same time and are backup to each other, and both can be used as feedback signals.
Generally among the prior art is when the battery package internal gas pressure surpassed the threshold value, and pressure monitoring device awakens up BMS through awakening up the signal line, however when awakening up the signal line and taking place physical fault, will not reach the purpose of awakening up, can't remind BMS, cause the condition not in place to battery monitoring. The invention designs a backup circuit for the awakening/sleeping circuit, and when a certain signal line fails due to physical fault, the corresponding awakening signal/sleeping signal/feedback signal can still be sent through the backup circuit. The reliability of the device is greatly improved, and whether a certain signal line is disconnected or not can be diagnosed. When monitoring battery package atmospheric pressure, if when the atmospheric pressure of battery package exceeded when the threshold value of setting for, can avoid because the pressure monitoring device that arouses line trouble and lead to became invalid, improved BMS's security.
In an alternative embodiment, the LIN bus is also used for the pressure monitoring device to send real-time monitored air pressure signals and corresponding diagnostic signals to the battery management system,
when the air pressure value corresponding to the air pressure signal exceeds a threshold value, the pressure monitoring device sends a diagnosis signal to the battery management system, wherein the diagnosis signal comprises one or more of a LIN diagnosis frame sent by the LIN bus and a PWM wave generated by the wake-up signal line, and the duty ratio of the PWM wave represents the state of the diagnosis signal.
It is understood that the pressure monitoring device may also transmit diagnostic information to the BMS, and the diagnostic signals transmitted by the pressure monitoring device to the BMS include: (1) a LIN diagnostic frame, (2) a PWM wave generated by the wake-up signal line. The diagnostic signals (1) and (2) may be sent separately. Preferably, the diagnostic signals (1) and (2) are transmitted simultaneously, back up each other, and both can be used as diagnostic signals. According to the invention, the fault information of the pressure monitoring device is diagnosed through the LIN protocol, the fault information of the pressure monitoring device can be sent to the BMS by adjusting the duty ratio of the PWM wave of the wake-up signal line, meanwhile, the two signal lines realize the backup of the diagnosis signal, and the condition that the fault information cannot be output due to the fault of a certain signal line in the prior art can be avoided.
In an optional embodiment, the duty ratio of the PWM wave and the diagnostic code corresponding to the diagnostic frame have a preset corresponding relationship.
It can be understood that two diagnostic signals transmitted by the two signals have a certain corresponding relationship, the diagnostic code of the LIN diagnostic frame and the duty ratio of the PWM wave are designed according to the preset corresponding relationship, and the corresponding relationship enables the fault information transmitted by the two diagnostic signals to be consistent, so that the fault corresponding to the pressure monitoring device can be conveniently determined. For example, as shown in fig. 2, LIN diagnostic code 0 corresponds to a duty cycle of 20% of the PWM wave, which indicates that the pressure monitoring device is operating normally; the LIN diagnostic code 1 corresponds to the duty ratio of 30% of PWM wave, and the LIN bus of the pressure monitoring device is abnormal at the moment; the LIN diagnostic code 2 corresponds to the duty ratio of 40% of the PWM wave, and indicates that the request signal line of the pressure monitoring device is abnormal at this time; the LIN diagnostic code 3 corresponds to the duty ratio of 50% of PWM wave, and indicates that the air pressure value monitored by the pressure monitoring device is abnormal at the moment, namely the pressure sensor fails; the LIN diagnostic code 4 corresponds to the duty ratio of 20% of PWM wave, and at the moment, the pressure value monitored by the pressure monitoring device is over-large; the LIN diagnostic code 5 corresponds to the duty ratio of 70% of PWM wave, and at the moment, the voltage of the pressure monitoring device is over-high; the LIN diagnostic code 6 corresponds to the duty ratio of 80% of PWM wave, and at the moment, the voltage of the pressure monitoring device is too low; the LIN diagnostic code 7 corresponds to a duty ratio of 90% of the PWM wave, which indicates an internal abnormality of the pressure monitoring device. The correspondence is a schematic example, and the correspondence between the LIN diagnostic code and the duty ratio of the PWM wave is not specifically limited, and may be adaptively designed.
In an optional embodiment, the pressure monitoring device includes an operating mode, a low power consumption mode and an ultra-low power consumption mode, and the pressure monitoring device switches among the three modes according to a trigger condition; wherein the content of the first and second substances,
the trigger condition of the working mode comprises a wake-up signal sent by the battery management system;
the triggering condition of the low power consumption mode comprises a sleep signal sent by the battery management system;
the trigger condition of the ultra-low power mode includes a time for continuous operation of the low power mode.
In an optional implementation manner, in the operating mode, when the pressure monitoring device receives a sleep signal sent by the battery management system, the pressure monitoring device switches to a low power consumption mode;
in the low power consumption mode or the ultra-low power consumption mode, when the pressure monitoring device receives a wake-up signal sent by the battery management system, the pressure monitoring device is switched to the working mode;
in the low power consumption mode, when the continuous operation time of the pressure monitoring device exceeds the preset time, the pressure monitoring device is switched to the ultra-low power consumption mode.
The invention designs three modes for the pressure monitoring device: as shown in fig. 3, the three modes, i.e., the operating mode, the low power mode, and the ultra-low power mode, can be switched to cooperate with the bi-directional sleep wake-up function between the pressure monitoring device and the BMS to reduce the power consumption of the pressure monitoring device.
In the working mode, the pressure monitoring device is always in a working state, monitors the air pressure in real time and reports the air pressure to the BMS;
in the low power consumption mode, the pressure monitoring device automatically switches between an ultra-low power consumption mode (sleep mode) and a working mode at regular intervals, the pressure monitoring device does not monitor air pressure in the ultra-low power consumption mode, and the air pressure is monitored in the working mode;
in the ultra-low power consumption mode, the pressure monitoring device is in a sleep state and is not automatically awakened any more, and the pressure monitoring device can be awakened by the BMS in the mode.
Wherein, the working mode can be switched to a low power consumption mode:
in the working mode, the pressure monitoring device acquires the air pressure value of the battery pack in real time and sends an air pressure signal to the BMS, and when the pressure monitoring device receives a sleep signal sent by the BMS, the pressure monitoring device switches to the low power consumption mode, the sleep signal comprises one or more of a sleep command sent by the LIN bus and a low level signal sent by the request signal line, and the sleep signal is as described above and is not repeated herein.
The low power consumption mode can be switched to an operating mode or an ultra-low power consumption mode:
(1) in the low power consumption mode, the pressure monitoring device does not acquire the air pressure value of the battery pack, when the pressure monitoring device receives a wake-up signal sent by the BMS, the pressure monitoring device switches to the working mode, and in the working mode, the pressure monitoring device acquires the air pressure value of the battery pack in real time and sends the air pressure signal to the BMS, the wake-up signal comprises one or more of a wake-up command sent by the LIN bus and a high-level signal sent by the request signal line, and the wake-up signal is as described in the foregoing description and is not repeated herein.
(2) In the low power consumption mode, the pressure monitoring device does not acquire the air pressure value of the battery pack, and after the pressure monitoring device continuously operates in the low power consumption mode for 24 hours, for example, the pressure monitoring device switches to the ultra-low power consumption mode, where the continuous operation time is an illustrative example and can be designed adaptively.
The ultra-low power consumption mode can be switched to the working mode:
in the ultra-low power consumption mode, the pressure monitoring device does not acquire the air pressure value of the battery pack, and when receiving a wake-up signal sent by the BMS, the pressure monitoring device switches to the working mode, the wake-up signal includes one or more of a wake-up command sent by the LIN bus and a high level signal sent by the request signal line, and the wake-up signal is as described above and is not described herein again.
The working process of the pressure monitoring device of the invention is shown in fig. 4, and comprises the following steps:
s1, acquiring an air pressure value after the device is started;
s2, determining whether an event for setting the air pressure parameter is received, setting an air pressure parameter threshold value when the air pressure parameter needs to be set, and otherwise, entering S3;
s3, determining whether a wake-up event is received, and when it is determined that the wake-up event is received, setting the pressure monitoring device (shown as a detection device) to a working mode (shown as a normal/normal working mode), and stopping the low power consumption mode;
s4, determining whether a low power consumption event is received, setting the detection equipment to be in a low power consumption mode when the low power consumption event is determined to be received, and starting a timing task of the continuous operation time of the low power consumption mode;
s5, determining whether an ultra-low power consumption event is received, setting the detection equipment to be in an ultra-low power consumption mode after the low power consumption mode continuously operates for 24 hours, and otherwise, entering S6;
and S6, determining whether an air pressure abnormal event is received, performing air pressure abnormal processing when the air pressure abnormal event is determined to be received, otherwise, determining the mode of the pressure monitoring device, including a working mode, a low power consumption mode and an ultra-low power consumption mode, and entering the next cycle.
The working process of the working mode of the pressure monitoring device is shown in fig. 5, and comprises the following steps:
s1, initializing after first starting;
s2, determining whether the monitored air pressure value exceeds a preset threshold value, entering S3 when the monitored air pressure value exceeds the preset threshold value, and otherwise ending the working mode;
and S3, setting an air pressure abnormal event and preparing to process the abnormal event.
The working mode is mainly to judge the condition that the monitored air pressure value exceeds the threshold value and set an air pressure abnormal event when the monitored air pressure value exceeds the threshold value.
The operation flow of the low power consumption mode is shown in fig. 6, and includes:
s1, after starting, determining whether the 24-hour (exemplary example) accumulation of the low power consumption mode is completed, setting the low power consumption mode to be the ultra-low power consumption mode after the completion and entering S2, otherwise, directly entering S2;
s2, determining whether the working time in the low power consumption working mode is finished, if so, entering S3, otherwise, finishing the low power consumption mode;
s3, determining whether the monitored air pressure value exceeds a preset threshold value, setting an air pressure abnormal event when the monitored air pressure value exceeds the preset threshold value, and entering S4, otherwise, directly entering S4;
s4, setting the execution time of the low power consumption mode to be M milliseconds (for example), entering the low power consumption mode to wait to be awakened;
s5, entering S6 when receiving the wake-up signal sent by the BMS, otherwise, judging whether the timing time of M milliseconds reaches, entering S6 when the timing time reaches M milliseconds, and continuing to enter S5 when the timing time does not reach M milliseconds;
s6, setting the operation time in the low power consumption mode to be N milliseconds (for example), and ending the low power consumption mode.
The low power mode is mainly completed by the process of entering the ultra-low power mode through accumulation of continuous operation time (for example, 24 hours) and the process that the air pressure value exceeds the threshold value. The M milliseconds and the N milliseconds need to be determined according to the power consumption requirement in the low power consumption mode. The 24 hour setting may also be adjusted according to specific power consumption requirements.
The working flow of the ultra-low power consumption mode is shown in fig. 7, and comprises the following steps:
s1, after starting, turning off the power supply of each peripheral module;
s2, the pressure monitoring device enters a sleep state and waits to be awakened;
s3, entering S4 when receiving the wake-up signal sent by the BMS, and otherwise continuing S3;
and S4, setting a wake-up event and ending the ultra-low power consumption mode.
In the above three modes, when it is determined that there is an atmospheric pressure abnormal event, the work flow of processing the abnormal event is shown in fig. 8, and includes:
s1, starting the air pressure abnormal processing, determining whether the abnormal processing mark is 0, and entering S2 when the abnormal processing mark is 0, otherwise entering S3;
s2, the pressure monitoring device sends a wake-up signal to the BMS (the wake-up signal line is set to be high level and the LIN bus sends a wake-up command), the abnormal processing mark is set to be 1, and the air pressure abnormal processing is finished;
s3, after a certain time (for example, 500ms of exception handling time) is reached, determining whether a feedback signal (wake-up feedback command sent by LIN bus and request signal line high level) of the BMS is received, after receiving the feedback signal sent by the BMS, clearing 0 the air pressure exception event and entering S4, otherwise, directly entering S4;
and S4, clearing the exception handling flag, and finishing the air pressure exception handling.
Sending a wake-up signal to the BMS under the condition of abnormal air pressure value, wherein the wake-up signal comprises a wake-up signal line set to be high level and/or an LIN bus sending wake-up command, if a certain time is reached and a feedback signal is received, the abnormal air pressure event is not processed, otherwise, sending the wake-up signal again until the abnormal air pressure processing is finished,
the method for monitoring the pressure of the battery pack, which is provided by the embodiment of the invention, realizes the bidirectional awakening between the pressure monitoring device and the battery management system through the bidirectional communication between the pressure monitoring device and the battery management system, and comprises the following steps:
the battery management system sends a wake-up signal or a sleep signal to the pressure monitoring device so that the pressure monitoring device enters a wake-up state or a sleep state;
the pressure monitoring device sends a wake-up signal to the battery management system so as to enable the battery management system to enter a wake-up state;
the battery management system sends a wake-up signal to the pressure monitoring device, wherein the wake-up signal sent by the battery management system to the pressure monitoring device comprises one or more of a high-level signal sent by a request signal line and a wake-up command sent by a LIN bus;
the sleep signal sent by the battery management system to the pressure monitoring device comprises one or more of a low-level signal sent by a request signal line and a sleep command sent by a LIN bus;
the wake-up signal sent by the pressure monitoring device to the battery management system comprises one or more of a high-level pulse generated by a wake-up signal line and a wake-up command sent by a LIN bus.
In an alternative embodiment, the method further comprises:
after the pressure monitoring device enters the awakening state, the pressure monitoring device sends a feedback signal to the battery management system, wherein the feedback signal comprises one or more of an awakening feedback instruction sent by the LIN bus and a high-level pulse generated by an awakening signal line.
In an alternative embodiment, the method further comprises:
after the pressure monitoring device enters a sleep state, the pressure monitoring device sends a feedback signal to the battery management system, wherein the feedback signal comprises one or more of a sleep feedback instruction sent by the LIN bus and a high-level pulse generated by a wake-up signal line.
In an alternative embodiment, the method further comprises:
after the battery management system enters the awakening state, the battery management system sends a feedback signal to the pressure monitoring device, wherein the feedback signal comprises one or more of an awakening feedback instruction sent by the LIN bus and a high-level signal sent by a request signal line.
In an alternative embodiment, the method further comprises:
the pressure monitoring device sends real-time monitored air pressure signals and corresponding diagnostic signals to the battery management system,
when the air pressure value corresponding to the air pressure signal exceeds a threshold value, the pressure monitoring device sends a diagnosis signal to the battery management system, wherein the diagnosis signal comprises one or more of a LIN diagnosis frame sent by the LIN bus and a PWM wave generated by the wake-up signal line, and the duty ratio of the PWM wave represents the state of the diagnosis signal.
In an optional embodiment, the duty ratio of the PWM wave and the diagnostic code corresponding to the diagnostic frame have a preset corresponding relationship.
In an alternative embodiment, the pressure monitoring device includes an operating mode, a low power mode, and an ultra-low power mode, the method comprising:
switching the pressure monitoring device among three modes according to a trigger condition; wherein the content of the first and second substances,
the trigger condition of the working mode comprises a wake-up signal sent by the battery management system;
the triggering condition of the low power consumption mode comprises a sleep signal sent by the battery management system;
the trigger condition of the ultra-low power mode includes a duration time of the low power mode.
In an optional implementation manner, in the operating mode, when the pressure monitoring device receives a sleep signal sent by the battery management system, the pressure monitoring device switches to a low power consumption mode;
in the low power consumption mode or the ultra-low power consumption mode, when the pressure monitoring device receives a wake-up signal sent by the battery management system, the pressure monitoring device is switched to the working mode;
in the low power consumption mode, when the continuous operation time of the pressure monitoring device exceeds the preset time, the pressure monitoring device is switched to the ultra-low power consumption mode.
The disclosure also relates to an electronic device comprising a server, a terminal and the like. The electronic device includes: at least one processor; a memory communicatively coupled to the at least one processor; and a communication component communicatively coupled to the storage medium, the communication component receiving and transmitting data under control of the processor; wherein the memory stores instructions executable by the at least one processor to implement the method of the above embodiments.
In an alternative embodiment, the memory is used as a non-volatile computer-readable storage medium for storing non-volatile software programs, non-volatile computer-executable programs, and apparatus. The processor executes various functional applications of the device and data processing, i.e., implements methods, by executing non-volatile software programs, instructions, and means stored in the memory.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store a list of options, etc. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and such remote memory may be connected to the external device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more devices are stored in the memory and, when executed by the one or more processors, perform the method of any of the method embodiments described above.
The product can execute the method provided by the embodiment of the application, has corresponding functional devices and beneficial effects of the execution method, and can refer to the method provided by the embodiment of the application without detailed technical details in the embodiment.
The present disclosure also relates to a computer-readable storage medium for storing a computer-readable program for causing a computer to perform some or all of the above-described method embodiments.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those of ordinary skill in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
It will be understood by those skilled in the art that while the present invention has been described with reference to exemplary embodiments, various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (16)

1. A battery pack pressure monitoring device, characterized in that, pressure monitoring device includes master control chip, and with pressure sensor and LIN transceiver that master control chip links to each other, pressure monitoring device still includes:
the LIN bus is used for sending a wake-up signal or a sleep signal to the pressure monitoring device by the battery management system and sending the wake-up signal to the battery management system by the pressure monitoring device;
the wake-up signal line is used for sending a wake-up signal to the battery management system by the pressure monitoring device;
a request signal line for the battery management system to send a wake-up signal or a sleep signal to the pressure monitoring device;
the pressure monitoring device with two-way communication between the battery management system to realize two-way awakening between pressure monitoring device and the battery management system includes:
the battery management system sends a wake-up signal or a sleep signal to the pressure monitoring device so that the pressure monitoring device enters a wake-up state or a sleep state;
the pressure monitoring device sends a wake-up signal to the battery management system so as to enable the battery management system to enter a wake-up state;
wherein the wake-up signal transmitted by the battery management system to the pressure monitoring device comprises one or more of a high-level signal transmitted by the request signal line and a wake-up command transmitted by the LIN bus;
the sleep signal sent by the battery management system to the pressure monitoring device comprises one or more of a low-level signal sent by the request signal line and a sleep command sent by the LIN bus;
the wake-up signal sent by the pressure monitoring device to the battery management system comprises one or more of a high-level pulse generated by the wake-up signal line and a wake-up command sent by the LIN bus;
wherein the LIN bus is also used for the pressure monitoring device to send real-time monitored air pressure signals and corresponding diagnosis signals to the battery management system,
when the air pressure value corresponding to the air pressure signal exceeds a threshold value, the pressure monitoring device sends a diagnosis signal to the battery management system, wherein the diagnosis signal comprises one or more of a LIN diagnosis frame sent by the LIN bus and a PWM wave generated by the wake-up signal line, and the duty ratio of the PWM wave represents the state of the diagnosis signal.
2. The device of claim 1, wherein, upon the pressure monitoring device entering a wake-up state, the pressure monitoring device sends a feedback signal to the battery management system, the feedback signal comprising one or more of a wake-up feedback command sent by the LIN bus and a high-level pulse generated by the wake-up signal line.
3. The device of claim 1, wherein, upon the pressure monitoring device entering a sleep state, the pressure monitoring device sends a feedback signal to the battery management system, the feedback signal comprising one or more of a sleep feedback command sent by the LIN bus and a high-level pulse generated by the wake-up signal line.
4. The device of claim 1, wherein after the battery management system enters the wake-up state, the battery management system sends a feedback signal to the pressure monitoring device, the feedback signal comprising one or more of a wake-up feedback command sent by the LIN bus and a high signal sent by the request signal line.
5. The apparatus of claim 1, wherein the duty ratio of the PWM wave has a preset correspondence with a diagnostic code corresponding to the diagnostic frame.
6. The device according to any one of claims 1-5, wherein the pressure monitoring device comprises an operating mode, a low power consumption mode and an ultra-low power consumption mode, and the pressure monitoring device switches between the three modes according to a trigger condition; wherein the content of the first and second substances,
the trigger condition of the working mode comprises a wake-up signal sent by the battery management system;
the triggering condition of the low power consumption mode comprises a sleep signal sent by the battery management system;
the trigger condition of the ultra-low power mode includes a duration time of the low power mode.
7. The device of claim 6, wherein in the operating mode, when the pressure monitoring device receives a sleep signal sent by the battery management system, the pressure monitoring device switches to the low power consumption mode;
in the low power consumption mode or the ultra-low power consumption mode, when the pressure monitoring device receives a wake-up signal sent by the battery management system, the pressure monitoring device is switched to the working mode;
in the low power consumption mode, when the continuous operation time of the pressure monitoring device exceeds the preset time, the pressure monitoring device is switched to the ultra-low power consumption mode.
8. A method for monitoring the pressure of a battery pack, which is characterized in that the method realizes the bidirectional awakening between a pressure monitoring device and a battery management system through the bidirectional communication between the pressure monitoring device and the battery management system, and comprises the following steps:
the battery management system sends a wake-up signal or a sleep signal to the pressure monitoring device so that the pressure monitoring device enters a wake-up state or a sleep state;
the pressure monitoring device sends a wake-up signal to the battery management system so as to enable the battery management system to enter a wake-up state;
the battery management system sends a wake-up signal to the pressure monitoring device, wherein the wake-up signal sent by the battery management system to the pressure monitoring device comprises one or more of a high-level signal sent by a request signal line and a wake-up command sent by a LIN bus;
the sleep signal sent by the battery management system to the pressure monitoring device comprises one or more of a low-level signal sent by a request signal line and a sleep command sent by a LIN bus;
the wake-up signal sent by the pressure monitoring device to the battery management system comprises one or more of a high-level pulse generated by a wake-up signal line and a wake-up command sent by a LIN bus;
the LIN bus is used for sending a wake-up signal or a sleep signal to the pressure monitoring device by the battery management system and sending the wake-up signal to the battery management system by the pressure monitoring device;
a wake-up signal line for the pressure monitoring device to send a wake-up signal to the battery management system;
a request signal line for the battery management system to send a wake-up signal or a sleep signal to the pressure monitoring device;
the method further comprises the following steps: the pressure monitoring device sends real-time monitored air pressure signals and corresponding diagnostic signals to the battery management system,
when the air pressure value corresponding to the air pressure signal exceeds a threshold value, the pressure monitoring device sends a diagnosis signal to the battery management system, wherein the diagnosis signal comprises one or more of a LIN diagnosis frame sent by the LIN bus and a PWM wave generated by the wake-up signal line, and the duty ratio of the PWM wave represents the state of the diagnosis signal.
9. The method of claim 8, wherein the method further comprises:
after the pressure monitoring device enters the awakening state, the pressure monitoring device sends a feedback signal to the battery management system, wherein the feedback signal comprises one or more of an awakening feedback instruction sent by the LIN bus and a high-level pulse generated by an awakening signal line.
10. The method of claim 8, wherein the method further comprises:
after the pressure monitoring device enters a sleep state, the pressure monitoring device sends a feedback signal to the battery management system, wherein the feedback signal comprises one or more of a sleep feedback instruction sent by the LIN bus and a high-level pulse generated by a wake-up signal line.
11. The method of claim 8, wherein the method further comprises:
after the battery management system enters the awakening state, the battery management system sends a feedback signal to the pressure monitoring device, wherein the feedback signal comprises one or more of an awakening feedback instruction sent by the LIN bus and a high-level signal sent by a request signal line.
12. The method of claim 8, wherein the duty cycle of the PWM wave has a preset correspondence with a diagnostic code corresponding to the diagnostic frame.
13. The method of any of claims 8-12, wherein the pressure monitoring device includes an operational mode, a low power mode, and an ultra-low power mode, the method comprising:
switching the pressure monitoring device among three modes according to a trigger condition; wherein the content of the first and second substances,
the trigger condition of the working mode comprises a wake-up signal sent by the battery management system;
the triggering condition of the low power consumption mode comprises a sleep signal sent by the battery management system;
the trigger condition of the ultra-low power mode includes a duration time of the low power mode.
14. The method of claim 13, wherein in the operating mode, when the pressure monitoring device receives a sleep signal sent by the battery management system, the pressure monitoring device switches to the low power mode;
in the low power consumption mode or the ultra-low power consumption mode, when the pressure monitoring device receives a wake-up signal sent by the battery management system, the pressure monitoring device is switched to the working mode;
in the low power consumption mode, when the continuous operation time of the pressure monitoring device exceeds the preset time, the pressure monitoring device is switched to the ultra-low power consumption mode.
15. An electronic device comprising a memory and a processor, wherein the memory is configured to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the method of any one of claims 8-14.
16. A computer-readable storage medium, on which a computer program is stored, the computer program being executable by a processor for implementing the method according to any of the claims 8-14.
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