Electrochemical gas sensing information acquisition device and method for battery state detection

Abstract

The application relates to an electrochemical gas sensing information collection device and method for battery state detection, which comprises a protective shell and a data collection board. The data collection board comprises a microprocessor for sending configuration instructions and standby control instructions, and running a gas collection state machine program based on collection parameter information when receiving an external start collection instruction, so as to realize gas information collection and analysis; an electrochemical gas sensor for acquiring a battery gas analog detection signal of volatile gas in a battery working process in real time; an analog-to-digital converter for converting the battery gas analog detection signal into a digital signal and transmitting the digital signal to the microprocessor for analysis and processing; a digital-to-analog converter for providing a driving bias voltage; and a control loop for regulating the on-off and working state of a sensing collection channel. Compared with the prior art, the application has the advantage that the battery can continuously collect volatile gas in a working state.

Description

Technical Field

[0001] This invention relates to the field of battery state detection technology, and in particular to an electrochemical gas sensing information acquisition device and method for battery state detection. Background Technology

[0002] As energy storage batteries and power lithium batteries develop towards higher energy density, higher rate operation, and integrated modularization, the gas generation behavior of their cells under charge and discharge operating environments, such as electrolyte decomposition, micro-short circuit gas generation, and thermal runaway precursor gas evolution, is becoming increasingly critical to battery safety status assessment. Traditional battery status detection methods, such as voltage and internal resistance monitoring, temperature acquisition, and static capacity testing, have limitations such as lag and inability to dynamically capture the evolution characteristics of trace gases during battery operation. Against this backdrop, electrochemical gas sensing technology, combined with the design of a dedicated information acquisition device, provides a new solution for achieving real-time, dynamic status detection of batteries under operating conditions.

[0003] However, although electrochemical gas sensing technology has achieved breakthrough applications in high-precision dynamic acquisition in fields such as environmental monitoring and industrial gas detection, its potential in in-situ gas generation detection under battery working conditions has not been fully utilized. The bottlenecks are: (1) In dynamic state detection for the entire battery life cycle and variable rate charging and discharging, traditional gas acquisition methods, such as fixed-point passive sampling and intermittent gas detection, are affected by battery structure and instantaneous fluctuations in gas generation, resulting in poor synchronization of detection timing and difficulty in meeting the requirements of continuous gas data for real-time battery state prediction; (2) General-purpose gas acquisition equipment has low signal acquisition accuracy and weak anti-battery electromagnetic interference capability, which can easily mask the trace and low-frequency gas generation signals generated by early battery faults, making it difficult to accurately capture the hidden failure dynamics of the battery under real working conditions, thus restricting the progress of battery safety early warning and performance reliability optimization.

[0004] Therefore, it is necessary to research and design new gas information acquisition methods and corresponding acquisition devices based on electrochemical sensing. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art by providing an electrochemical gas sensing information acquisition device and method for battery state detection, which solves the problem of difficulty in collecting volatile gases generated by the battery in the working state, thereby realizing continuous collection of volatile gases by the battery in the working state.

[0006] The objective of this invention can be achieved through the following technical solutions: An electrochemical gas sensing information acquisition device for battery state detection includes a protective shell and a data acquisition board disposed within the protective shell, the data acquisition board comprising: The microprocessor is used to send configuration instructions and standby control instructions, and when it receives an external start acquisition instruction, it runs a gas acquisition state machine program based on the acquisition parameter information to realize gas information acquisition and analysis. The microprocessor is connected to an analog-to-digital converter and a digital-to-analog converter respectively. An electrochemical gas sensor is used to acquire simulated detection signals of volatile gases during battery operation in real time. One end of the electrochemical gas sensor is connected to the analog-to-digital converter (ADC) through a control loop, and the other end is connected to the digital-to-analog converter (DAC). The ADC converts the simulated detection signal of the battery gas into a digital signal and transmits it to the microprocessor for analysis and processing. The DAC provides a drive bias voltage, and the control loop regulates the on / off state and operating status of the sensing acquisition path. The power management module is used to provide operating power.

[0007] Furthermore, the configuration instructions include multiple options such as sampling parameter configuration, output parameter configuration, signal conditioning parameter configuration, mode state configuration, and power enable configuration.

[0008] Furthermore, the gas acquisition state machine program is configured to switch states based on sensor output signals, real-time gas concentration changes, and acquisition timing, and execute corresponding acquisition tasks. The states include sampling, signal processing, judgment, storage, and waiting.

[0009] Furthermore, the data collection task includes: Send a command to the digital-to-analog converter to set the drive bias voltage; Send a data acquisition command to the analog-to-digital converter to activate gas simulation signal detection; Record collected data in real time, filter, store, and package valid data for uploading; Real-time monitoring of gas data changes; when gas concentration exceeds a preset threshold, abnormal data is marked.

[0010] Furthermore, the collected data includes multiple parameters such as gas concentration, collection time, concentration change rate, and abnormal fluctuation signals.

[0011] Furthermore, the digital-to-analog converter is also connected to an electrochemical gas sensor via a sensing loop, which includes a signal amplification circuit and a filtering circuit connected in sequence.

[0012] Furthermore, the control loop includes a control switch and a mode switching circuit. The input terminal of the mode switching circuit is connected to the pin of the microprocessor, and the output terminal is connected to the control switch, the analog-to-digital converter, and the digital-to-analog converter, respectively, to realize the switching between the detection mode and the standby mode of the acquisition device.

[0013] Furthermore, the protective shell includes a shell body and a shell cover that are interconnected to form a receiving space for the data acquisition board.

[0014] Furthermore, the cover has a connection window for connecting the acquisition device to the host computer.

[0015] The present invention also provides a method for acquiring information using the electrochemical gas sensing information acquisition device for battery state detection described above, comprising the following steps: The microprocessor sends configuration instructions to initialize the digital-to-analog converter, analog-to-digital converter, and control loop; The microprocessor sends a standby control command to the power management module, enabling the power management module to provide standby regulated power supply, while simultaneously controlling the control loop to disconnect the sensor acquisition path. Upon receiving an external start-up command, the microprocessor interprets the command to obtain acquisition parameter information and runs a gas acquisition state machine program based on the acquisition parameter information to achieve gas information acquisition and analysis.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention provides a gas information acquisition device that can achieve high adaptability and high precision for detecting volatile gases in the working state of batteries. It can achieve accurate acquisition, adapt to the application requirements of in-situ detection and continuous monitoring in various battery working states, and effectively solve the problems of poor time synchronization and insufficient data continuity of traditional detection methods.

[0017] (2) The device of the present invention integrates the functions of sensing acquisition, signal conversion, and data control, and specifically solves the core bottlenecks of traditional general gas acquisition equipment, such as low accuracy, weak anti-interference ability, and difficulty in capturing early trace gas generation signals. In view of the problem of complex electromagnetic interference at the battery working site and the ease with which early faults are masked by noise, this device achieves accurate signal conversion through high-precision analog-to-digital and digital-to-analog conversion units, effectively suppresses electromagnetic interference during battery operation, and effectively solves the problem of easy diffusion of volatile gases during battery operation, difficulty in stable collection and dynamic acquisition, and ensures the stability, continuity and accuracy of battery gas data acquisition.

[0018] (3) The present invention can adjust the acquisition mode according to the real-time working status of the battery, eliminate the data loss caused by traditional intermittent acquisition, and fully meet the needs of real-time battery status detection.

[0019] (4) The present invention includes a data acquisition board and a protective shell. The protective shell can be connected to different types of batteries through different interfaces, and different types of gas sensors can be replaced to adapt to different testing requirements. It can adapt to gas detection scenarios of different types of batteries, has good versatility, and the hardware module has strong versatility. It is compatible with the real-time monitoring requirements of the normal working state of the battery, effectively expanding the application scenarios and detection functions of battery status detection.

[0020] (5) The device of the present invention has a high degree of integration and a simple overall structure. It does not require complex detection equipment, which greatly reduces the experimental cost and equipment investment cost of battery gas state detection, and provides reliable data support for battery safety status assessment, fault prediction and performance research. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the protective shell of the present invention; Among them, 1. Data acquisition board, 1-01. Microprocessor, 1-02. Analog-to-digital converter, 1-03. Digital-to-analog converter, 1-04. Electrochemical gas sensor, 1-05. Sensing circuit, 1-06. Control circuit, 3. Battery, 4. Host computer, 2-01. Shell body, 2-02. Shell cover, 2-03. Connection window. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0023] This embodiment provides an electrochemical gas sensing information acquisition device for battery state detection, referencing... Figure 1 and Figure 2 As shown, it includes a protective casing and a data acquisition board 1 housed within the protective casing, for reference. Figure 1 As shown, the data acquisition board 1 is used to measure the gas content of the battery 3 and is connected to the host computer 4, including: Microprocessor 1-01 is used to send configuration instructions and standby control instructions, and when it receives an external start acquisition instruction, it runs a gas acquisition state machine program based on the acquisition parameter information to realize gas information acquisition and analysis. This microprocessor is connected to analog-to-digital converter 1-02 and digital-to-analog converter 1-03 respectively. Electrochemical gas sensor 1-04 is used to acquire the battery gas simulation detection signal of volatile gases during battery operation in real time. One end of the electrochemical gas sensor 1-04 is connected to analog-to-digital converter 1-02 through control loop 1-06, and the other end is connected to digital-to-analog converter 1-03. Analog-to-digital converter 1-02 converts the battery gas simulation detection signal into a digital signal and transmits it to microprocessor 1-01 for analysis and processing. Digital-to-analog converter 1-02 is used to respond to the control signal of microprocessor 1-01 and provide drive bias voltage. Control loop 1-04 is used to regulate the on / off state and working status of the sensing acquisition path to realize continuous and intermittent controllable acquisition of battery gas signals. The power management module, connected to other functional modules, provides a stable power supply, enabling stable voltage and current regulation, power supply switching, and overload protection, ensuring long-term stable operation of the device.

[0024] In a preferred embodiment, the digital-to-analog converter 1-03 is also connected to the electrochemical gas sensor 1-04 via a sensing circuit 1-05. The sensing circuit 1-05 includes a signal amplification circuit and a filtering circuit connected in sequence, which are used to amplify and filter the signal from the microprocessor 1-01.

[0025] In a preferred embodiment, the data acquisition board includes a board body, and the electrochemical gas sensor 1-04 is detachably mounted on the board body.

[0026] Specifically, the gas acquisition state machine program is configured to switch states based on sensor output signals, real-time gas concentration changes, and acquisition timing, and execute corresponding acquisition tasks. These states include sampling, signal processing, decision-making, storage, and waiting. The acquisition tasks corresponding to different states may include: Send a command to the digital-to-analog converter to set the drive bias voltage; Send a data acquisition command to the analog-to-digital converter to activate gas simulation signal detection; Real-time recording of collected data, including gas concentration, collection time, concentration change rate, and various abnormal fluctuation signals; filtering, storing, and packaging valid data for uploading. Real-time monitoring of gas data changes; when gas concentration exceeds a preset threshold, abnormal data is marked.

[0027] Furthermore, the control loop 1-06 includes a control switch and a mode switching circuit. The input terminal of the mode switching circuit is connected to the pin of the microprocessor 1-01, and the output terminal is connected to the control switch, the analog-to-digital converter 1-02, and the digital-to-analog converter 1-03 respectively, so as to realize the switching between the detection mode and the standby mode of the acquisition device.

[0028] In one specific implementation, the microprocessor 1-01 uses an STM32 series main control chip; the digital-to-analog converter 1-03 uses a high-precision digital-to-analog converter chip to provide a stable reference level for sensor detection; the analog-to-digital converter 1-02 uses a high-resolution analog-to-digital converter chip to accurately capture weak gas sensing electrical signals; the power management module is connected to the host computer and includes a voltage regulator circuit, an overcurrent protection circuit, a voltage conversion circuit, and a power supply filter circuit, which can realize wide voltage input and multi-level regulated output, and can stably provide 5V / 3.3V voltage signals to the electrochemical gas information acquisition device; the electrochemical gas sensor 1-04 is a non-contact design that dynamically detects the components and concentrations of volatile gases emitted from the battery in real time.

[0029] In other embodiments, the electrochemical gas sensor can be adapted to a corresponding sensor based on the type of volatile gas emitted by the battery under test, including sensors capable of detecting electrolyte volatile gases and decomposing combustible gases.

[0030] In other embodiments, the control loop also includes a signal isolation circuit to avoid signal crosstalk between modules and improve the overall operational stability of the device.

[0031] In one specific implementation, the protective shell adopts an insulated rigid shell structure and is designed separately from the data acquisition board, sealing and accommodating the entire data acquisition board as a whole.

[0032] like Figure 2 As shown, the protective shell includes a shell body 2-01 and a shell cover 2-02 that are interconnected to form a space for the data acquisition board 1.

[0033] Furthermore, the cover 2-02 has a connection window 2-03 for connecting the acquisition device to the host computer.

[0034] The working process of the electrochemical gas sensing information acquisition device for battery state detection described above includes the following steps: S1: Initialization: The microprocessor sends configuration instructions to the digital-to-analog converter, analog-to-digital converter, sensing loop, and control loop, including instructions for sampling parameter configuration, output parameter configuration, signal conditioning parameter configuration, mode state configuration, power enable configuration, etc., to complete the parameter initialization and hardware configuration work before the device officially starts collecting data.

[0035] S2: Standby: The microprocessor sends control commands to the power management module to provide standby regulated power to each module. At the same time, it controls the control loop in the acquisition device to disconnect the sensing acquisition path, so that the electrochemical gas sensor and sensing loop enter a low-power standby monitoring state and wait for the acquisition start command.

[0036] S3: Start Gas Acquisition Working Mode: After receiving an external start acquisition command, the microprocessor interprets the command information to obtain parameter information such as acquisition duration, acquisition frequency, detection threshold, and working channel. It then runs the preset gas sensor acquisition state machine program to carry out volatile gas information acquisition and obtain the corresponding gas detection data results.

[0037] According to some implementation methods, the gas sensing acquisition state machine program in step S3 includes the following steps: S31: The microprocessor runs the corresponding gas acquisition mode state machine system program according to the interpreted acquisition start command and configuration parameters, sends configuration commands, and binds and matches the corresponding digital-to-analog converter channel, analog-to-digital converter channel, and electrochemical gas sensor acquisition path.

[0038] S32: The microprocessor runs different states of the state machine based on user-defined parameters such as acquisition frequency, acquisition duration, and data storage mode. These states include sampling, signal processing, judgment, storage, and waiting. The microprocessor switches between these states based on sensor output signals, real-time gas concentration changes, and acquisition timing conditions, and then judges and executes the corresponding acquisition tasks.

[0039] S33: The microprocessor executes the corresponding acquisition tasks, including: sending instructions to the digital-to-analog converter to set the output bias voltage of the corresponding channel, providing a stable operating voltage for the electrochemical gas sensor and sensing circuit, and ensuring normal sensor response; sending acquisition instructions to the analog-to-digital converter to enable gas analog signal detection, accurately acquiring the gas concentration analog signal obtained by the sensor, and converting it into a digital signal for data preprocessing; recording the acquired data such as gas concentration, acquisition time, concentration change rate, and abnormal fluctuation signals in real time, filtering, storing, and uploading valid data; and acquiring battery voltage, current, temperature signals, and gas data changes in real time, and marking abnormal data when the gas concentration exceeds a preset threshold.

[0040] S34: After a single acquisition task is completed, the microprocessor determines the next working state based on the current acquisition status, preset acquisition interval, continuous acquisition duration, and other conditions, sets the next signal acquisition and status update time, completes the acquisition task delay configuration, and cyclically detects the working status of each acquisition channel to continuously execute the battery volatile gas sensor information acquisition task.

[0041] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An electrochemical gas sensing information acquisition device for battery state detection, characterized in that, It includes a protective shell and a data acquisition board disposed within the protective shell, the data acquisition board comprising: The microprocessor is used to send configuration instructions and standby control instructions, and when it receives an external start acquisition instruction, it runs a gas acquisition state machine program based on the acquisition parameter information to realize gas information acquisition and analysis. The microprocessor is connected to an analog-to-digital converter and a digital-to-analog converter respectively. An electrochemical gas sensor is used to acquire simulated detection signals of volatile gases during battery operation in real time. One end of the electrochemical gas sensor is connected to the analog-to-digital converter (ADC) through a control loop, and the other end is connected to the digital-to-analog converter (DAC). The ADC converts the simulated detection signal of the battery gas into a digital signal and transmits it to the microprocessor for analysis and processing. The DAC provides a drive bias voltage, and the control loop regulates the on / off state and operating status of the sensing acquisition path. The power management module is used to provide operating power.

2. The electrochemical gas sensing information acquisition device for battery state detection according to claim 1, characterized in that, The configuration instructions include various configurations such as sampling parameters, output parameters, signal conditioning parameters, mode state, and power enable.

3. The electrochemical gas sensing information acquisition device for battery state detection according to claim 1, characterized in that, The gas acquisition state machine program is configured to switch states based on sensor output signals, real-time gas concentration changes, and acquisition timing, and execute corresponding acquisition tasks. The states include sampling, signal processing, judgment, storage, and waiting.

4. The electrochemical gas sensing information acquisition device for battery state detection according to claim 3, characterized in that, The data collection task includes: Send a command to the digital-to-analog converter to set the drive bias voltage; Send a data acquisition command to the analog-to-digital converter to activate gas simulation signal detection; Record collected data in real time, filter, store, and package valid data for uploading; Real-time monitoring of gas data changes; when gas concentration exceeds a preset threshold, abnormal data is marked.

5. The electrochemical gas sensing information acquisition device for battery state detection according to claim 4, characterized in that, The collected data includes multiple parameters such as gas concentration, collection time, concentration change rate, and abnormal fluctuation signals.

6. The electrochemical gas sensing information acquisition device for battery state detection according to claim 1, characterized in that, The digital-to-analog converter is also connected to an electrochemical gas sensor via a sensing loop, which includes a signal amplification circuit and a filtering circuit connected in sequence.

7. The electrochemical gas sensing information acquisition device for battery state detection according to claim 1, characterized in that, The control loop includes a control switch and a mode switching circuit. The input terminal of the mode switching circuit is connected to the pin of the microprocessor, and the output terminal is connected to the control switch, the analog-to-digital converter, and the digital-to-analog converter, respectively, to realize the switching between the detection mode and the standby mode of the acquisition device.

8. The electrochemical gas sensing information acquisition device for battery state detection according to claim 1, characterized in that, The protective shell includes a shell body and a shell cover that are interconnected to form a receiving space for the data acquisition board.

9. The electrochemical gas sensing information acquisition device for battery state detection according to claim 8, characterized in that, The cover has a connection window for connecting the data acquisition device to the host computer.

10. A method for acquiring information using an electrochemical gas sensing device for battery state detection as described in any one of claims 1-9, characterized in that, Includes the following steps: The microprocessor sends configuration instructions to initialize the digital-to-analog converter, analog-to-digital converter, and control loop; The microprocessor sends a standby control command to the power management module, enabling the power management module to provide standby regulated power supply, while simultaneously controlling the control loop to disconnect the sensor acquisition path. Upon receiving an external start-up command, the microprocessor interprets the command to obtain acquisition parameter information and runs a gas acquisition state machine program based on the acquisition parameter information to achieve gas information acquisition and analysis.

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