Air pressure detection method, air pressure sensor chip, battery pack, and storage medium

Abstract

The application relates to an air pressure detection method, an air pressure sensor chip, a battery pack and a storage medium. The method comprises the following steps: acquiring air pressure data in a battery pack under the condition that a battery management system in the battery pack is in a sleep state; performing abnormality detection according to the air pressure data to obtain a detection result; and outputting a first wake-up signal and first fault information to the battery management system under the condition that the detection result represents air pressure abnormality in the battery pack; wherein the first wake-up signal is used for waking up the battery management system, and the first fault information is used for instructing the battery management system to output air pressure abnormality prompt information. According to the application, air pressure detection can be performed when the battery management system is in a sleep mode, heat runaway monitoring is realized, and the safety of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, specifically to a method for detecting air pressure, an air pressure sensor chip, a battery pack, and a storage medium. Background Technology

[0002] With the development of new energy technologies, batteries are being used in a wider range of fields. For example, new energy vehicles, robots, and drones can all be powered by batteries.

[0003] Currently, battery management systems (BMS) and pressure sensors are typically installed in battery packs. The BMS determines whether the battery pack has experienced thermal runaway based on the pressure data collected by the pressure sensors.

[0004] However, when the electrical equipment is not in operation, the battery management system will enter a dormant mode and will no longer perform thermal runaway monitoring, which is not conducive to monitoring the safety of the battery pack. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a pressure detection method, a pressure sensor chip, a battery pack, and a storage medium, which enable pressure detection even when the battery management system is in sleep mode, thereby achieving thermal runaway monitoring and improving the safety of the battery pack.

[0006] In a first aspect, this application provides a pressure detection method applied to a pressure sensor chip. The method includes: acquiring pressure data within the battery pack while the battery management system in the battery pack is in a dormant state; performing anomaly detection based on the pressure data to obtain a detection result; and outputting a first wake-up signal and a first fault information to the battery management system when the detection result indicates an abnormal pressure within the battery pack. The first wake-up signal is used to wake up the battery management system, and the first fault information is used to instruct the battery management system to output an abnormal pressure warning message.

[0007] In the technical solution of this application embodiment, when the battery management system is in sleep mode, the air pressure sensor chip performs air pressure detection. When the air pressure sensor chip detects an abnormal air pressure in the battery pack, it wakes up the battery management system and causes the battery management system to output an abnormal air pressure warning message, notifying relevant personnel to take corresponding measures, thereby improving the safety of the battery pack.

[0008] In some embodiments, the method further includes: generating a self-test pressure signal according to a preset self-test time; matching the self-test pressure signal with a pre-stored standard pressure signal to obtain a self-test result; and, if the self-test result indicates a self-test anomaly, outputting a first wake-up signal and second fault information to the battery management system, wherein the second fault information is used to notify the battery management system that the pressure sensor chip has a self-test anomaly. In the technical solution of this application embodiment, the pressure sensor chip performs a self-test according to a preset self-test time, which can improve the reliability of pressure detection and reduce the risk caused by the pressure sensor chip malfunctioning and failing to perform pressure detection, thereby improving the safety of the battery pack.

[0009] In some embodiments, the method further includes: outputting a reset request to the battery management system when the self-test result indicates a self-test abnormality; wherein the reset request is used to instruct the battery management system to return a reset command; receiving the reset command and stopping power supply to each module in the pressure sensor chip; and powering back on the pressure sensor chip after a preset time. In the technical solution of this application embodiment, the pressure sensor chip performs a reset and restart after a self-test abnormality to eliminate its own fault, improve the reliability of the pressure sensor chip, thereby improving the reliability of pressure detection and reducing the risk caused by the inability to perform pressure detection due to a fault in the pressure sensor chip.

[0010] In some embodiments, the method further includes: after power-on, if the self-test anomaly is not eliminated, outputting third fault information to the battery management system, the third fault information being used to instruct the battery management system to output a self-test anomaly prompt information. In the technical solution of this application embodiment, if the self-test anomaly cannot be eliminated, the battery management system is promptly notified so that the battery management system can take appropriate action, thereby reducing the risk caused by the inability to perform air pressure detection due to a faulty air pressure sensor chip and improving the safety of the battery pack.

[0011] In some embodiments, the method further includes: receiving a sleep signal input from the battery management system; entering a sleep mode according to pre-stored configuration information and the sleep signal; and receiving a second wake-up signal input from the battery management system to switch from the sleep mode to the operating mode. In the technical solution of this application embodiment, the barometric pressure sensor chip can be controlled into sleep mode, thereby reducing the power consumption of the barometric pressure sensor chip, and consequently reducing the power consumption of the battery pack, extending the battery's driving range.

[0012] In some embodiments, receiving the sleep signal input by the battery management system includes receiving the sleep signal input by the battery management system through the communication module of the barometric pressure sensor chip. The technical solutions of this application provide various sleep modes, which can reduce the power consumption of the barometric pressure sensor chip, thereby reducing the power consumption of the battery pack.

[0013] Secondly, this application provides a pressure sensor chip. The pressure sensor chip includes a pressure sensing circuit and a control circuit connected to each other; the control circuit is connected to the battery management system of the battery pack; the pressure sensing circuit is used to detect the pressure of the battery pack to obtain pressure data; the control circuit is used to perform anomaly detection based on the pressure data, obtain detection results, and, when the detection results indicate an abnormal pressure inside the battery pack, output a first wake-up signal and a first fault information to the battery management system; wherein, the first wake-up signal is used to wake up the battery management system, and the first fault information is used to instruct the battery management system to output an abnormal pressure warning message.

[0014] This application provides a pressure sensor chip that detects air pressure when the battery management system is powered off and in sleep mode. When the air pressure inside the battery pack is abnormal, the pressure sensor chip wakes up the battery management system and causes it to output an abnormal air pressure warning message to notify relevant personnel to take appropriate measures, thereby improving the safety of the battery pack.

[0015] In some embodiments, the pressure sensing circuit includes a pressure sensor, a signal processing circuit, and a diagnostic module; the diagnostic module is connected to both the pressure sensor and the signal processing circuit, and the signal processing circuit is also connected to a control circuit. In the technical solution of this application embodiment, the diagnostic module can perform a self-test of the pressure sensor chip, so that in the event of a fault in the pressure sensor chip, it can promptly notify the battery management system, enabling the battery management system to take appropriate measures and notify the user, thereby reducing the risk caused by the inability to detect pressure due to a faulty pressure sensor chip.

[0016] In some embodiments, the barometric pressure sensor chip further includes a power module, which is connected to the control circuit, the barometric pressure sensing circuit, the battery management system, and an external power source. In the technical solution of this application embodiment, the power module has the function of supplying power to each module in the barometric pressure sensor chip. Simultaneously, it can work with the battery management system to reset the barometric pressure sensor chip, providing a foundation for the normal operation of the barometric pressure sensor chip.

[0017] In some embodiments, the barometric pressure sensor chip further includes a communication module, which is connected to both the control circuit and the battery management system. In the technical solutions of this application, the barometric pressure sensor chip can expand its communication interface through the communication module, thereby achieving richer functionality.

[0018] Thirdly, this application provides a battery pack including a battery management system and a barometric pressure sensor chip as described in any of the second aspects.

[0019] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method of any one of the first aspects.

[0020] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the method of any one of the first aspects. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the alternative embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 This is a schematic diagram of the application environment of a barometric pressure detection method according to an embodiment of this application;

[0023] Figure 2 This is one of the structural schematic diagrams of a barometric pressure sensor chip according to an embodiment of this application;

[0024] Figure 3a This is a second schematic diagram of the structure of a barometric pressure sensor chip according to an embodiment of this application;

[0025] Figure 3b This is the third schematic diagram of the structure of a barometric pressure sensor chip according to an embodiment of this application;

[0026] Figure 3c This is the fourth schematic diagram of the structure of a barometric pressure sensor chip according to an embodiment of this application;

[0027] Figure 3d This is the fifth schematic diagram of the structure of a barometric pressure sensor chip according to an embodiment of this application;

[0028] Figure 4 This is the sixth schematic diagram of the structure of a barometric pressure sensor chip according to an embodiment of this application;

[0029] Figure 5 This is the seventh schematic diagram of the structure of a barometric pressure sensor chip according to an embodiment of this application;

[0030] Figure 6 This is a schematic flowchart of a barometric pressure detection method according to an embodiment of this application;

[0031] Figure 7 This is a flowchart illustrating the self-test steps of an embodiment of this application;

[0032] Figure 8 This is one of the flowcharts illustrating the reset steps of an embodiment of this application;

[0033] Figure 9 This is a second schematic flowchart of the reset steps according to an embodiment of this application;

[0034] Figure 10 This is a flowchart illustrating the hibernation step according to an embodiment of this application. Detailed Implementation

[0035] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0040] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0042] With the development of new energy technologies, batteries are being used in an increasingly wide range of fields, such as new energy vehicles, robots, and drones. Currently, battery packs typically include a Battery Management System (BMS) and a pressure sensor. The BMS uses the pressure sensor to detect air pressure readings to determine if thermal runaway has occurred. However, when the equipment is not in operation, the BMS enters a dormant mode and ceases thermal runaway monitoring, which is detrimental to monitoring battery pack safety.

[0043] To address the aforementioned problems, this application provides a method for detecting air pressure. This method employs a pressure sensor chip to acquire air pressure data within the battery pack while the battery management system (BMS) is in a dormant state. Anomaly detection is performed based on the air pressure data to obtain a detection result. If the detection result indicates an abnormal air pressure within the battery pack, a first wake-up signal and a first fault message are output to the BMS. Compared to conventional techniques where the BMS performs air pressure detection based on air pressure data, the technical solution of this application uses a pressure sensor chip to detect air pressure while the BMS is in dormant. When the pressure sensor chip detects an abnormal air pressure within the battery pack, it wakes up the BMS, causing the BMS to output an abnormal air pressure warning message and notify relevant personnel to take appropriate measures, thereby improving the safety of the battery pack.

[0044] The technical solutions involved in the embodiments of this application will be described below in conjunction with the application scenarios.

[0045] The air pressure detection method provided in this application embodiment can be applied to, for example... Figure 1The application environment shown includes a pressure sensor chip 1, a battery management system (BMS), and multiple battery cells B. The pressure sensor chip 1 is communicatively connected to the BMS. Battery cells B store electrical energy and can provide power for devices such as new energy vehicles, robots, and drones. Multiple battery cells B can be connected in series and / or parallel to form a battery pack. The pressure sensor chip 1 is located inside the battery pack and can detect the internal pressure. It can wake up the BMS when the internal pressure is abnormal. The BMS can be located inside or outside the battery pack. After being woken up, the BMS can output a pressure abnormality warning message and can also reset the pressure sensor chip 1 when it fails a self-test. It should be noted that the structure of the battery pack, the functions of the pressure sensor chip 1, and the BMS are not limited to the description in the example above and can be configured according to actual conditions.

[0046] According to some embodiments of this application, refer to Figure 2 A pressure sensor chip is provided. The pressure sensor chip 1 includes a pressure sensing circuit 11 and a control circuit 12 connected to each other; the control circuit 12 is connected to the battery management system (BMS) of the battery pack; the pressure sensing circuit 11 is used to detect the pressure of the battery pack to obtain pressure data; the control circuit 12 is used to perform anomaly detection based on the pressure data, obtain detection results, and output a first wake-up signal and a first fault information to the battery management system (BMS) when the detection results indicate an abnormal pressure inside the battery pack.

[0047] The first wake-up signal is used to wake up the battery management system (BMS), and the first fault information is used to instruct the BMS to output an abnormal air pressure warning message.

[0048] In this embodiment, the pressure sensor chip 1 includes a pressure sensing circuit 11 and a control circuit 12 connected to each other. The control circuit 12 is connected to the battery management system (BMS). The pressure sensing circuit 11 can detect the pressure of the battery pack to obtain pressure data and transmit the pressure data to the control circuit 12. After receiving the pressure data, the control circuit 12 compares the pressure data with a preset pressure threshold. If the pressure data is greater than or equal to the preset pressure threshold, a detection result of abnormal pressure inside the battery pack is obtained; if the pressure data is less than the preset pressure threshold, a detection result of normal pressure inside the battery pack is obtained.

[0049] If the detection results indicate an abnormal air pressure inside the battery pack, the control circuit 12 outputs a first wake-up signal and a first fault information to the battery management system (BMS). The BMS, which is in a dormant state, is awakened upon receiving the first wake-up signal and outputs an abnormal air pressure warning message based on the received first fault information.

[0050] In one embodiment, the control circuit 12 can transmit a first wake-up signal and first fault information together to the battery management system (BMS). For example, a wake-up command is generated based on the first wake-up signal and the first fault information, wherein the flag bit in the wake-up command indicates that the battery management system (BMS) is being woken up, and the data bits include air pressure abnormality information.

[0051] In another embodiment, the control circuit 12 can first transmit a first wake-up signal to the battery management system (BMS) to wake up the BMS, and then transmit the first fault information to the BMS. For example, the control circuit 12 outputs a high level to the BMS through the wake-up output terminal Wakeup to wake up the BMS, and then outputs the first fault information to the BMS through the information transmission terminal.

[0052] Upon receiving the first fault information, the Battery Management System (BMS) can control the display screen of electrical equipment (such as new energy vehicles, robots, drones, etc.) to show an abnormal air pressure warning message, control the air pressure warning indicator light of the electrical equipment to light up, and control the speaker of the electrical equipment to play an abnormal air pressure warning voice message.

[0053] It should be noted that the transmission methods of the first wake-up signal and the first fault information, as well as the method of the battery management system (BMS) outputting abnormal air pressure warning information, are not limited to the above examples and can be set according to the actual situation.

[0054] In the above embodiments, the pressure sensor chip includes a pressure sensing circuit and a control circuit interconnected; the control circuit is connected to the battery management system of the battery pack; the pressure sensing circuit detects the pressure of the battery pack to obtain pressure data; the control circuit performs anomaly detection based on the pressure data, obtains detection results, and outputs a first wake-up signal and a first fault information to the battery management system when the detection results indicate an abnormal pressure inside the battery pack. This application provides a pressure sensor chip that detects pressure when the battery management system is powered down and in sleep mode, and wakes up the battery management system when an abnormal pressure occurs inside the battery pack, causing the battery management system to output an abnormal pressure warning message to notify relevant personnel to take appropriate measures, thereby improving the safety of the battery pack.

[0055] According to some embodiments of this application, refer to Figure 3a The air pressure sensing circuit 11 includes an air pressure sensor 111, a signal processing circuit 112, and a diagnostic module 113; the diagnostic module is connected to the air pressure sensor 111 and the signal processing circuit 112 respectively, and the signal processing circuit 112 is also connected to the control circuit 12.

[0056] In this embodiment, the pressure sensing circuit 11 includes a pressure sensor 111, a signal processing circuit 112, and a diagnostic module 113. The diagnostic module 113 is connected to both the pressure sensor 111 and the signal processing circuit 112, and the signal processing circuit 112 is connected to the control circuit 12. The control circuit 12 is connected to the battery management system (BMS) via the wakeup output terminal.

[0057] The air pressure sensor 111 senses the air pressure in the battery pack to generate an electrical signal and transmits the electrical signal to the signal processing circuit 112; the signal processing circuit 112 processes the electrical signal to obtain air pressure data and transmits the air pressure data to the control circuit 12; the control circuit 12 performs anomaly detection based on the air pressure data.

[0058] Optionally, the pressure sensor 111 can be a MEMS (Microelectro Mechanical Systems) sensor. MEMS sensors include surface piezoresistive sensors, whose impedance changes with pressure. The MEMS sensor may also include a temperature detection module, which is typically a PN junction structure and uses voltage changes to detect the temperature of the MEMS sensor.

[0059] The diagnostic module 113 can output a self-test electrical signal to the signal processing circuit 112 according to a preset self-test time. The self-test time can include the self-test cycle of the pressure sensor chip 1 after power-on initialization and in operating mode. For example, when the pressure sensor chip 1 is working normally, it outputs a self-test electrical signal to the signal processing circuit 112 every 10ms.

[0060] The signal processing circuit 112 processes the self-test electrical signal to obtain a self-test air pressure signal, and transmits the self-test air pressure signal to the control circuit 12. The control circuit 12 matches the self-test air pressure signal with a pre-stored standard air pressure signal. If the self-test air pressure signal matches the standard air pressure signal, it indicates that the signal processing circuit 112 is processing the self-test electrical signal normally, and a normal self-test result can be obtained. If the self-test air pressure signal does not match the standard air pressure signal, it indicates that the signal processing circuit 112 is processing the self-test electrical signal abnormally, and an abnormal self-test result can be obtained.

[0061] If the self-test results indicate an anomaly, the control circuit 12 outputs a first wake-up signal and a second fault information to the battery management system (BMS). Upon receiving the first wake-up signal, the BMS is awakened and, based on the second fault information, learns that the pressure sensor chip 1 has a self-test anomaly. It can then take a series of measures, such as outputting a self-test anomaly warning message or controlling the pressure sensor chip 1 to restart.

[0062] It should be noted that the measures taken by the Battery Management System (BMS) based on the second fault information are not limited to the examples above, and can be set according to the actual situation.

[0063] In some embodiments, refer to Figure 3b The barometric pressure sensor chip 1 includes a random access memory (RAM) that stores configuration information, preset pressure thresholds, standard pressure signals, and configuration programs for the control circuit 12. The RAM is connected to the control circuit 12. After the barometric pressure sensor chip 1 is powered on, the RAM loads the configuration information, preset pressure thresholds, and standard pressure signals into the control circuit 12; alternatively, the control circuit 12 retrieves the configuration information, preset pressure thresholds, and standard pressure signals from the RAM when needed.

[0064] In some embodiments, refer to Figure 3c The signal processing circuit 112 may include a first gating module 1121, an amplification module 1122, an analog-to-digital converter (ADC), and a digital signal processing module (DSP) connected in sequence; wherein, the first gating module 1121 is connected to the barometric pressure sensor 111 and the diagnostic module 113 respectively, and the digital signal processing module (DSP) is connected to the control circuit 12.

[0065] The electrical signal collected by the pressure sensor 111 is input to the first gating module 1121. The first gating module 1121 can switch the electrical signal transmitted to the amplification module 1122 at a fixed frequency. The amplification module 1122 amplifies the input electrical signal at a fixed ratio and transmits the amplified electrical signal to the analog-to-digital converter (ADC). The ADC converts the amplified electrical signal into a digital signal and transmits the digital signal to the digital signal processing module (DSP). The DSP performs Fourier transform and noise filtering on the digital signal to obtain the pressure data and transmits the pressure data to the control circuit 12.

[0066] Similarly, the first gating module 1121, the amplification module 1122, the analog-to-digital converter module (ADC), and the digital signal processing module (DSP) can process the self-test electrical signal generated by the diagnostic module 113 to obtain the self-test air pressure signal.

[0067] In some embodiments, refer to Figure 3dThe signal processing circuit 112 may further include a high-frequency clock module OSC_HS, a low-frequency clock module OSC_LS, and a second gating module 1123. The second gating module 1123 is connected to the high-frequency clock module OSC_HS, the low-frequency clock module OSC_LS, and the digital signal processing module DSP, respectively. The second gating module 1123 may also be connected to the control circuit 12 or the battery management system (BMS) and controlled by the control circuit 12 or the BMS. The second gating module 1123 can be controlled to transmit the high-frequency clock signal output by the high-frequency clock module OSC_HS to the digital signal processing module DSP, or to transmit the low-frequency clock signal output by the low-frequency clock module OSC_LS to the digital signal processing module DSP. The high-frequency clock signal can be used during high-speed sampling, and the low-frequency clock signal can be used in the low-power mode of the pressure sensor chip 1. The power of the pressure sensor chip 1 decreases after the sampling frequency is reduced.

[0068] In the above embodiments, the pressure sensing circuit includes a pressure sensor, a signal processing circuit, and a diagnostic module. The diagnostic module is connected to both the pressure sensor and the signal processing circuit, and the signal processing circuit is also connected to the control circuit. In the technical solution of this application embodiment, the diagnostic module can perform a self-test of the pressure sensor chip, so that in the event of a fault in the pressure sensor chip, it can promptly notify the battery management system, enabling the battery management system to take appropriate measures and notify the user, thereby reducing the risk caused by the inability to detect pressure due to a faulty pressure sensor chip.

[0069] According to some embodiments of this application, refer to Figure 4 The barometric pressure sensor chip 1 also includes a power supply module (PMU), which is connected to the control circuit 12, the barometric pressure sensing circuit 11, the battery management system (BMS), and the external power supply (VDD).

[0070] In this embodiment, the pressure sensor chip 1 further includes a power supply module (PMU), which is connected to the control circuit 12, the pressure sensing circuit 11, and the external power supply VDD. The external power supply VDD supplies power to the control circuit 12 and the pressure sensing circuit 11 through the power supply module PMU.

[0071] In some embodiments, the power supply module (PMU) is connected to the first gating module 1121, the amplification module 1122, the analog-to-digital converter (ADC), the digital signal processing module (DSP), the random access memory (RAM), the high-frequency clock module (OSC_HS), the low-frequency clock module (OSC_LS), and the second gating module 1123, respectively. The external power supply VDD powers these modules through the power supply module (PMU). It should be noted that... Figure 4 The connection relationship of the power supply module (PMU) is not shown in the document.

[0072] The power supply module (PMU) can also be connected to the battery management system (BMS). If a self-test result indicates an abnormality, the control circuit 12 outputs a reset request to the BMS. Upon receiving the reset request, the BMS returns a reset command to the power supply module (PMU). After receiving the reset command, the power supply module (PMU) disconnects the external power supply VDD from each module in the pressure sensor chip 1, stopping power supply to the modules. After a preset time, the power supply module (PMU) reconnects the external power supply to the modules in the pressure sensor chip, re-powering the pressure sensor chip 1.

[0073] In some embodiments, after receiving a reset command, the power module PMU disconnects only the external power supply VDD from the RAM, control circuit 12, DPS, and ADC in the barometric pressure sensor chip 1, stopping power supply to the RAM, control circuit 12, DPS, and ADC. After a preset time, the power module PMU reconnects the external power supply to the RAM, control circuit 12, DPS, and ADC, re-powering them.

[0074] In some embodiments, if the self-test anomaly is not cleared after power-on, the control circuit 12 outputs a third fault information to the battery management system (BMS); upon receiving the third fault information, the BMS outputs a self-test anomaly warning message. The output method can refer to the above embodiments, and will not be repeated here.

[0075] In the above embodiments, the barometric pressure sensor chip further includes a power module, which is connected to the control circuit, the barometric pressure sensing circuit, the battery management system, and an external power source. In the technical solution of this application embodiment, the power module has the function of supplying power to each module in the barometric pressure sensor chip. Simultaneously, it can also work with the battery management system to reset the barometric pressure sensor chip, providing a foundation for the normal operation of the barometric pressure sensor chip.

[0076] According to some embodiments of this application, refer to Figure 5 The barometric pressure sensor chip 1 also includes a communication module SPI, which is connected to the control circuit 12 and the battery management system (BMS).

[0077] In this embodiment, the pressure sensor chip 1 further includes a communication module SPI, which is connected to the control circuit 12 and also connected to the battery management system (BMS) via ports such as the enable terminal CS and the data terminal Data. The first fault information, the second fault information, and the third fault information generated by the control circuit 12 can be directly transmitted to the BMS, or they can be transmitted to the BMS via the communication module SPI.

[0078] When the battery management system (BMS) controls the pressure sensor chip 1 to enter sleep mode, it can directly transmit the sleep signal to the control circuit 12, or it can transmit the sleep signal to the control circuit 12 via the communication module SPI. After receiving the sleep signal, the control circuit 12 controls the pressure sensor chip 1 to enter sleep mode according to the pre-stored configuration information and the sleep signal. The communication module SPI can receive the second wake-up signal input by the battery management system (BMS) through the enable terminal CS, and transmit the second wake-up signal to the control circuit 12. The control circuit 12 wakes up the pressure sensor chip 1 according to the second wake-up signal and switches the pressure sensor chip 1 from sleep mode to working mode.

[0079] The aforementioned sleep mode can be either all modules in the barometric pressure sensor chip 1 in a wake-up state, or some modules in a wake-up state while others operate in a low-power mode. It should be noted that the sleep mode is not limited to the above example and can be set according to actual conditions.

[0080] In the above embodiments, the barometric pressure sensor chip further includes a communication module, which is connected to both the control circuit and the battery management system. In the technical solution of this application, the barometric pressure sensor chip can expand its communication interface through the communication module, thereby achieving richer functionality.

[0081] According to some embodiments of this application, a battery pack is provided, which includes a battery management system and a barometric pressure sensor chip as described in the above embodiments.

[0082] In the technical solution of this application embodiment, when the battery management system is in sleep mode, the air pressure sensor chip performs air pressure detection. When the air pressure sensor chip detects an abnormal air pressure in the battery pack, it wakes up the battery management system and causes the battery management system to output an abnormal air pressure warning message, notifying relevant personnel to take corresponding measures, thereby improving the safety of the battery pack.

[0083] According to some embodiments of this application, refer to Figure 6 A method for detecting air pressure is provided. Taking the application of this method to the air pressure sensor chip in the above embodiment as an example, the method may include the following steps:

[0084] Step 201: Obtain the air pressure data inside the battery pack while the battery management system in the battery pack is in a dormant state.

[0085] Even when the battery management system in the battery pack is in sleep mode, the barometric pressure sensor chip continues to operate normally. The barometric pressure sensor in the chip senses the air pressure within the battery pack, generates an electrical signal, and inputs this signal to the first selection module. The first selection module can switch the electrical signal transmitted to the amplification module at a fixed frequency. The amplification module amplifies the input electrical signal by a fixed ratio and transmits the amplified signal to the analog-to-digital converter (ADC). The ADC converts the amplified electrical signal into a digital signal and transmits the digital signal to the digital signal processing module. The digital signal post-processing module performs Fourier transform and noise filtering on the digital signal to obtain the barometric pressure data and transmits the data to the control circuit.

[0086] Step 202: Perform anomaly detection based on air pressure data and obtain the detection results.

[0087] After receiving the air pressure data, the control circuit compares the air pressure data with a preset air pressure threshold. If the air pressure data is greater than or equal to the preset air pressure threshold, it obtains a detection result of abnormal air pressure inside the battery pack; if the air pressure data is less than the preset air pressure threshold, it obtains a detection result of normal air pressure inside the battery pack.

[0088] Step 203: If the detection results indicate abnormal air pressure inside the battery pack, output a first wake-up signal and a first fault information to the battery management system.

[0089] The first wake-up signal is used to wake up the battery management system, and the first fault information is used to instruct the battery management system to output an abnormal air pressure warning message.

[0090] In the event of abnormal air pressure within the battery pack, the control circuit outputs a first wake-up signal and a first fault message to the battery management system. Upon receiving the first wake-up signal, the battery management system, which is in dormant mode, is awakened and outputs an abnormal air pressure warning message based on the received first fault message.

[0091] In some embodiments, the control circuit outputs first fault information to the battery management system through the communication module of the pressure sensor chip.

[0092] In the above embodiments, when the battery management system in the battery pack is in a dormant state, the air pressure data inside the battery pack is acquired; anomaly detection is performed based on the air pressure data to obtain a detection result; if the detection result indicates an abnormal air pressure inside the battery pack, a first wake-up signal and a first fault information are output to the battery management system. In the technical solution of this application embodiment, when the battery management system is in a dormant state, an air pressure sensor chip performs air pressure detection. When the air pressure sensor chip detects an abnormal air pressure inside the battery pack, it wakes up the battery management system, causing the battery management system to output an abnormal air pressure warning message, notifying relevant personnel to take appropriate measures, thereby improving the safety of the battery pack.

[0093] According to some embodiments of this application, refer to Figure 7 It may also include the following steps:

[0094] Step 301: Generate a self-test pressure signal according to the preset self-test time.

[0095] The preset self-test time can include the self-test cycle after the barometric pressure sensor chip is powered on and initialized, as well as during operation. For example, after the barometric pressure sensor chip is powered on and initialized, a self-test barometric pressure signal is generated; when the barometric pressure sensor chip is working normally, a self-test barometric pressure signal is generated every 10ms.

[0096] The diagnostic module in the barometric pressure sensor chip generates a self-test electrical signal based on a preset self-test time and inputs this signal to the first gating module. The first gating module switches the self-test electrical signal transmitted to the amplification module at a fixed frequency. The amplification module amplifies the input self-test electrical signal by a fixed ratio and transmits the amplified signal to the analog-to-digital converter (ADC). The ADC converts the amplified self-test electrical signal into a digital signal and transmits it to the digital signal processing module. The digital signal post-processing module performs Fourier transform and noise filtering on the digital signal to obtain the self-test barometric pressure signal, which is then transmitted to the control circuit.

[0097] Step 302: Match the self-test pressure signal with the pre-stored standard pressure signal to obtain the self-test result.

[0098] The standard air pressure signal can be stored in the RMA of the air pressure sensor chip.

[0099] The control circuit matches the self-test pressure signal with a pre-stored standard pressure signal. If the self-test pressure signal matches the standard pressure signal, it indicates that the signal processing circuit is processing the self-test electrical signal normally, and a normal self-test result can be obtained. If the self-test pressure signal does not match the standard pressure signal, it indicates that the signal processing circuit is processing the self-test electrical signal abnormally, and an abnormal self-test result can be obtained.

[0100] Step 303: If the self-test result indicates an abnormality, output the first wake-up signal and the second fault information to the battery management system.

[0101] The second fault information is used to notify the battery management system that the pressure sensor chip has a self-test abnormality.

[0102] If the self-test fails, the control circuit outputs a first wake-up signal to the battery management system, waking it up. The control circuit also outputs a second fault message to the battery management system; based on the second fault message, the battery management system detects the self-test failure of the pressure sensor chip and performs relevant processing, such as outputting a self-test failure prompt message.

[0103] In some embodiments, the control circuit outputs a second fault information to the battery management system through the communication module of the pressure sensor chip.

[0104] In the above embodiments, a self-test pressure signal is generated according to a preset self-test time; the self-test pressure signal is matched with a pre-stored standard pressure signal to obtain a self-test result; if the self-test result indicates a self-test abnormality, a first wake-up signal and a second fault information are output to the battery management system. In the technical solution of this application embodiment, the pressure sensor chip performs a self-test according to a preset self-test time, which can improve the reliability of pressure detection, reduce the risk caused by the inability to perform pressure detection due to a fault in the pressure sensor chip, and thus improve the safety of the battery pack.

[0105] According to some embodiments of this application, refer to Figure 8 It may also include the following steps:

[0106] Step 401: If the self-test results indicate an abnormality, output a reset request to the battery management system.

[0107] The reset request is used to instruct the battery management system to return a reset command.

[0108] In the event of a self-test anomaly, the control circuit outputs a reset request to the battery management system; upon receiving the reset request, the battery management system returns a reset command to the power module of the barometric pressure sensor chip.

[0109] Step 402: Receive a reset command and stop supplying power to each module in the barometric pressure sensor chip.

[0110] After receiving the reset command, the power module disconnects the external power supply from the modules in the barometric pressure sensor chip, and stops supplying power to the modules in the barometric pressure sensor chip.

[0111] In some embodiments, after receiving a reset command, the power module only disconnects the external power supply VDD from the RAM, control circuit, DPS, and ADC, and stops supplying power to the RAM, control circuit, DPS, and ADC.

[0112] Step 403: After a preset time, power on the barometric pressure sensor chip again.

[0113] After a preset time, the power module connects the external power supply to the various modules in the barometric pressure sensor chip, re-powering the barometric pressure sensor chip.

[0114] In the above embodiments, if the self-test result indicates an abnormality, a reset request is output to the battery management system; a reset command is received, and power supply to each module in the pressure sensor chip is stopped; after a preset time, the pressure sensor chip is powered on again. In the technical solution of this application embodiment, the pressure sensor chip is reset and restarted after a self-test abnormality to eliminate its own fault, improve the reliability of the pressure sensor chip, thereby improving the reliability of pressure detection and reducing the risk caused by the inability to perform pressure detection due to a fault in the pressure sensor chip.

[0115] According to some embodiments of this application, refer to Figure 9 It may also include the following steps:

[0116] Step 404: If the self-test abnormality is not eliminated after power-on, output the third fault information to the battery management system.

[0117] The third fault information is used to instruct the battery management system to output a self-test abnormality prompt.

[0118] After the barometric pressure sensor chip is powered on again, it will operate normally if the self-test anomaly is cleared. If the self-test anomaly is not cleared, the control circuit outputs a third fault message to the battery management system. The battery management system receives the third fault message and outputs a self-test anomaly warning message.

[0119] In some embodiments, the control circuit outputs third fault information to the battery management system through the communication module of the pressure sensor chip.

[0120] In the above embodiments, if the self-test anomaly is not eliminated after power-on, a third fault message is output to the battery management system. In the technical solution of this application embodiment, if the self-test anomaly cannot be eliminated, the battery management system is promptly notified so that it can take appropriate action, thereby reducing the risk caused by the inability to perform air pressure detection due to a faulty air pressure sensor chip and improving the safety of the battery pack.

[0121] According to some embodiments of this application, refer to Figure 10 It may also include the following steps:

[0122] Step 501: Receive the sleep signal input from the battery management system.

[0123] The control circuit is equipped with a wake-up output terminal (Wakeup) and a wake-up input terminal (Wake). The control circuit can output a first wake-up signal to the battery management system through the wake-up output terminal (Wakeup) and receive a sleep signal input by the battery management system through the wake-up input terminal (Wake).

[0124] Step 502: Enter sleep mode based on pre-stored configuration information and sleep signal.

[0125] The barometric pressure sensor chip stores configuration information in its RAM. The RAM can transfer this configuration information to the control circuit upon power-up, or the control circuit can retrieve the configuration information from the RAM after receiving a sleep signal. Then, the control circuit controls the barometric pressure sensor chip to enter sleep mode based on the configuration information and the sleep signal.

[0126] Step 503: Receive the second wake-up signal input from the battery management system and switch from sleep mode to working mode.

[0127] If the control circuit receives a second wake-up signal from the battery management system via the wake-up input terminal, it will wake up each module and switch the pressure sensor chip from sleep mode to working mode.

[0128] In the above embodiments, a sleep signal is received from the battery management system; the system enters sleep mode according to pre-stored configuration information and the sleep signal; and a second wake-up signal is received from the battery management system to switch from sleep mode to working mode. In the technical solution of this application embodiment, the barometric pressure sensor chip can be controlled into sleep mode, thereby reducing the power consumption of the barometric pressure sensor chip, and consequently reducing the power consumption of the battery pack, extending the battery's driving range.

[0129] According to some embodiments of this application, "receiving a sleep signal input by the battery management system" in the above embodiments may include: receiving the sleep signal input by the battery management system through the communication module of the barometric pressure sensor chip.

[0130] The communication module receives the sleep signal from the battery management system and transmits it to the control circuit. The control circuit then controls the pressure sensor chip to enter sleep mode based on the configuration information and the sleep signal.

[0131] In the above embodiments, the barometric pressure sensor chip is put into sleep mode through the cooperation of the communication module and the battery management system. The technical solution of this application provides a variety of sleep modes, which can reduce the power consumption of the barometric pressure sensor chip and thus reduce the power consumption of the battery pack.

[0132] It should be understood that although the steps in the flowchart above are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps.

[0133] According to some embodiments of this application, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory including instructions that can be executed by a processor of an electronic device to perform the above-described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0134] According to some embodiments of this application, a computer program product is also provided, which, when executed by a processor, can implement the above-described methods. The computer program product includes one or more computer instructions. When these computer instructions are loaded and executed on a computer, some or all of the above-described methods can be implemented, wholly or partially, according to the processes or functions described in the embodiments of this application.

[0135] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0136] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0137] The embodiments described above merely illustrate several implementation methods of this application to facilitate a detailed understanding of the technical solutions of this application, but should not be construed as limiting the scope of protection of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. It should be understood that technical solutions obtained by those skilled in the art based on the technical solutions provided in this application through logical analysis, reasoning, or limited experimentation are all within the scope of protection of the appended claims. Therefore, the scope of protection of this patent application should be determined by the content of the appended claims, and the specification and drawings can be used to interpret the content of the claims.

Claims

1. A method for detecting air pressure, characterized in that, The method, applied to a barometric pressure sensor chip, includes: When the battery management system in the battery pack is in a dormant state, the air pressure data inside the battery pack is acquired; Anomaly detection is performed based on the air pressure data to obtain the detection results; If the detection result indicates an abnormal air pressure inside the battery pack, a first wake-up signal and a first fault information are output to the battery management system; wherein, the first wake-up signal is used to wake up the battery management system, and the first fault information is used to instruct the battery management system to output an abnormal air pressure warning message.

2. The method according to claim 1, characterized in that, The method further includes: Generate a self-test air pressure signal according to the preset self-test time; The self-test air pressure signal is matched with a pre-stored standard air pressure signal to obtain the self-test result; If the self-test result indicates a self-test anomaly, the system outputs the first wake-up signal and the second fault information to the battery management system. The second fault information is used to notify the battery management system that the pressure sensor chip has a self-test anomaly.

3. The method according to claim 2, characterized in that, The method further includes: If the self-test result indicates a self-test anomaly, a reset request is output to the battery management system; wherein, the reset request is used to instruct the battery management system to return a reset command; Upon receiving the reset command, power supply to each module in the barometric pressure sensor chip is stopped; After a preset time, the pressure sensor chip is powered on again.

4. The method according to claim 3, characterized in that, The method further includes: If the self-test anomaly is not eliminated after power is restored, a third fault information is output to the battery management system, which is used to instruct the battery management system to output a self-test anomaly prompt.

5. The method according to any one of claims 1-4, characterized in that, The method further includes: Receive the sleep signal input from the battery management system; Entering sleep mode based on pre-stored configuration information and the sleep signal; and Upon receiving a second wake-up signal from the battery management system, the system switches from the sleep mode to the working mode.

6. The method according to claim 5, characterized in that, The step of receiving the sleep signal input by the battery management system includes: The communication module of the pressure sensor chip receives the sleep signal input from the battery management system.

7. A barometric pressure sensor chip, characterized in that, The pressure sensor chip includes a pressure sensing circuit and a control circuit that are interconnected; the control circuit is connected to the battery management system of the battery pack. The air pressure sensing circuit is used to detect the air pressure of the battery pack and obtain air pressure data. The control circuit is configured to perform anomaly detection based on the air pressure data, obtain a detection result, and, if the detection result indicates an abnormal air pressure inside the battery pack, output a first wake-up signal and a first fault information to the battery management system; wherein, the first wake-up signal is used to wake up the battery management system, and the first fault information is used to instruct the battery management system to output an abnormal air pressure warning message.

8. The barometric pressure sensor chip according to claim 7, characterized in that, The pressure sensing circuit includes a pressure sensor, a signal processing circuit, and a diagnostic module; the diagnostic module is connected to the pressure sensor and the signal processing circuit, and the signal processing circuit is also connected to the control circuit.

9. The barometric pressure sensor chip according to claim 8, characterized in that, The barometric pressure sensor chip also includes a power module, which is connected to the control circuit, the barometric pressure sensing circuit, the battery management system, and an external power source.

10. The barometric pressure sensor chip according to any one of claims 7-9, characterized in that, The barometric pressure sensor chip also includes a communication module, which is connected to both the control circuit and the battery management system.

11. A battery pack, characterized in that, The battery pack includes a battery management system and a barometric pressure sensor chip as described in any one of claims 7-10.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 6.

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