Production line EOL-oriented battery pack airtightness detection explosion-proof protection method, device and equipment

Abstract

The invention relates to a method, device and equipment, and the method comprises the steps: arranging a pressure taking end in a sealing cavity, collecting and outputting a pressure signal to an external pressure monitoring unit, and enabling the external pressure monitoring unit to be provided with a power supply loop and a pressure signal collection channel which are independent of an airtight detector, the interlocking output channel is electrically connected with an interlocking component which is used for stopping detection, cutting off gas supply and releasing pressure; based on a pressure signal collected by an external pressure monitoring unit, the pressure in the sealing cavity is monitored in real time, and whether the pressure exceeds a preset safety threshold value or not is judged; when the external pressure monitoring unit judges that the pressure exceeds a preset safety threshold value and the airtight detector does not output alarm state information, the interlocking output channel drives the interlocking component to execute the steps of stopping detection, cutting off gas supply and releasing pressure so as to terminate the abnormal pressure increasing process. The redundancy and safety of the system are improved, and equipment damage and safety accidents are effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air tightness detection, and in particular to a battery pack air tightness detection explosion protection method, device and equipment for a production line EOL. BACKGROUND

[0002] The power battery pack can be screened out in the production line EOL link through air tightness detection to reduce the water ingress, corrosion and safety risk in the subsequent service. The existing production line can adopt a direct pressure type to fill compressed gas into the battery pack shell or a tooling loop, or a cover box type to pressurize the external cavity of the measured piece, and then take the pressure drop, stability or steady-state leakage rate as the pass criterion. In order to realize automation, the detection equipment can be built-in with a pressure sensor, an electromagnetic valve and a program control, and the upper threshold value and the timing sampling are set to determine the leakage and trigger the sound and light prompt.

[0003] In actual production, the dynamic overshoot caused by the gas source fluctuation, cavity volume difference, valve hysteresis and control cycle can cause short-time high pressure; if water mist, oil stains or particles are mixed in the pipeline, the pressure sampling channel will be contaminated, blocked or zero point drift; if the parameter is issued incorrectly, the range is selected improperly, the communication is blocked or the thread is stuck, the alarm channel will be invalid. When these factors are superimposed, the measured loop may appear the state of "pressure continues to rise and the equipment does not alarm" in the continuous inflation or holding stage, thereby bringing high consequence risks such as shell structure damage, safety valve misoperation and even explosion. The time average and digital filter set to improve the measurement accuracy can also delay the response to the rapid pressure rise under certain conditions.

[0004] The existing scheme mainly concentrates on the monitoring and interlocking inside the detector, and relies on a single pressure channel and software criterion to complete the measurement and safety control; in order to improve the reliability, the double threshold, emergency stop button or timing self-check can be added in engineering, but when the internal sensor link itself appears single-point failure such as contamination, drift, disconnection, the safety interlock may still be absent due to not being triggered. At the same time, the production line is frequently changed, the tooling is quickly plugged and unplugged, and the multi-shift operation can further increase the probability of parameter missetting and connection failure, making it difficult to completely avoid the occasional scene of "product internal overpressure still in detection".

[0005] Therefore, without changing the existing measurement process, it is still necessary to improve the timely handling and record tracing ability of abnormal pressure rise, reduce the high consequence risk when the built-in sensor chain fails and the continuous pressure rise is superimposed, and meet the "zero tolerance" requirement of the production line for safety. SUMMARY

[0006] The purpose of the present application is to provide a battery pack air tightness detection explosion protection method, device and equipment for a production line EOL.

[0007] According to an aspect of the present application, a battery pack EOL-oriented air tightness detection explosion protection method is provided. The battery pack is arranged in a sealed cavity. The air inlet and air outlet of the sealed cavity are respectively connected with an air tightness detector. When the pressure in the sealed cavity is abnormal, the air tightness detector outputs alarm state information. The method comprises the following steps: A pressure taking end is arranged in the sealed cavity. The pressure signal is collected and output to an external pressure monitoring unit. The external pressure monitoring unit is provided with a power supply circuit and a pressure signal collection channel independent of the air tightness detector. An interlocking output channel is electrically connected with an interlocking component for stopping detection, cutting off gas supply and releasing pressure. The pressure in the sealed cavity is monitored in real time based on the pressure signal collected by the external pressure monitoring unit, and it is judged whether the pressure exceeds a preset safety threshold. When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the air tightness detector does not output alarm state information, the interlocking component is driven through the interlocking output channel to stop detection, cut off gas supply and release pressure, so as to terminate the abnormal pressure rising process.

[0008] The interlocking component comprises: A signal interlocking piece is electrically connected with the interlocking output channel and the air tightness detector, respectively, for receiving the determination result of the external pressure monitoring unit. When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the air tightness detector does not output alarm state information, the signal interlocking piece outputs a control signal to the air tightness detector through the interlocking output channel to control the air tightness detector to stop detection. A gas circuit electromagnetic valve is arranged between the air tightness detector and the air inlet of the sealed cavity, and is electrically connected with the signal interlocking piece. When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the air tightness detector does not output alarm state information, the signal interlocking piece outputs a control signal to the gas circuit electromagnetic valve through the interlocking output channel to cut off the gas into the sealed cavity. A pressure relief electromagnetic valve is arranged between the air tightness detector and the air outlet of the sealed cavity, and is electrically connected with the signal interlocking piece. When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the air tightness detector does not output alarm state information, the signal interlocking piece outputs a control signal to the pressure relief electromagnetic valve through the interlocking output channel to release the gas in the sealed cavity and reduce the pressure in the sealed cavity.

[0009] When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the air tightness detector does not output alarm state information, the signal interlocking piece generates and outputs a control signal to drive the gas circuit electromagnetic valve to close first, and then drive the pressure relief electromagnetic valve to open.

[0010] The power supply circuit of the external pressure monitoring unit is connected to an independent power source and is isolated from the power supply system of the air tightness detector; The pressure signal collected by the pressure tapping end is output to the external pressure monitoring unit through a pressure signal collection channel independent of the air tightness detector; Thus, the pressure in the sealed cavity can be continuously monitored and a control signal can be output when the air tightness detector is powered off or a device failure occurs.

[0011] The external pressure monitoring unit simultaneously receives pressure signals of multiple sealed cavities and sets independent preset safety thresholds and interlocking output channels for each sealed cavity. When the pressure in any sealed cavity exceeds the preset safety threshold and the air tightness detector does not output alarm state information, only the sealed cavity with pressure exceeding the preset safety threshold is subjected to detection stoppage, gas supply cut-off, and pressure relief, without affecting the detection of other battery packs.

[0012] According to another aspect of the present application, a battery pack air tightness detection explosion protection device for a production line (EOL) is provided, which includes: A sealed cavity in which a battery pack to be measured is arranged, An air tightness detector, the gas inlet and outlet of the sealed cavity are respectively connected to the air tightness detector, and the air tightness detector outputs alarm state information when the pressure in the sealed cavity is abnormal. The device further includes the following steps: A pressure tapping end arranged in the sealed cavity to collect and output a pressure signal; An external pressure monitoring unit connected to the pressure tapping end and provided with a power supply circuit independent of the air tightness detector and a pressure signal collection channel, and receiving the pressure signal through the pressure signal collection channel; The external pressure monitoring unit further includes: An interlocking component for stopping detection, cutting off gas supply, and relieving pressure; An interlocking output channel electrically connected to the interlocking component; The interlocking component is connected to the air tightness detector and the pressure signal collection channel and monitors the pressure in the sealed cavity in real time based on the pressure signal to determine whether the pressure exceeds a preset safety threshold; When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold and the air tightness detector does not output alarm state information, the interlocking component is driven through the interlocking output channel to stop detection, cut off gas supply, and relieve pressure to terminate the abnormal pressure rising process.

[0013] The interlocking component includes: A signal interlock is electrically connected to the interlock output channel and the gas tightness detector, and is configured to receive a determination result of the external pressure monitoring unit. When the external pressure monitoring unit determines that the pressure exceeds a preset safety threshold, and the gas tightness detector does not output an alarm state information, the signal interlock outputs a control signal to the gas tightness detector through the interlock output channel to control the gas tightness detector to stop detection. A gas path electromagnetic valve is arranged between the gas tightness detector and an air inlet of the sealed cavity, and is electrically connected to the signal interlock. When the external pressure monitoring unit determines that the pressure exceeds a preset safety threshold, and the gas tightness detector does not output an alarm state information, the signal interlock outputs a control signal to the gas path electromagnetic valve through the interlock output channel to cut off the gas from entering the sealed cavity. A pressure relief electromagnetic valve is arranged between the gas tightness detector and an air outlet of the sealed cavity, and is electrically connected to the signal interlock. When the external pressure monitoring unit determines that the pressure exceeds a preset safety threshold, and the gas tightness detector does not output an alarm state information, the signal interlock outputs a control signal to the pressure relief electromagnetic valve through the interlock output channel to release the gas in the sealed cavity and reduce the pressure in the sealed cavity.

[0014] When the external pressure monitoring unit determines that the pressure exceeds a preset safety threshold, and the gas tightness detector does not output an alarm state information, the signal interlock generates and outputs a control signal to first drive the gas path electromagnetic valve to close, and then drive the pressure relief electromagnetic valve to open. The power supply circuit of the external pressure monitoring unit is connected to an independent power supply and is isolated from the power supply system of the gas tightness detector. The pressure signal collected by the pressure collection end is output to the external pressure monitoring unit through a pressure signal collection channel independent of the gas tightness detector. In this way, the pressure in the sealed cavity can be continuously monitored and a control signal can be output when the gas tightness detector is powered off or a device fault occurs.

[0015] The external pressure monitoring unit simultaneously receives pressure signals of multiple sealed cavities, and sets an independent preset safety threshold and an interlock output channel for each sealed cavity. When the pressure in any sealed cavity exceeds the preset safety threshold, and the gas tightness detector does not output an alarm state information, only the sealed cavity with pressure exceeding the preset safety threshold is stopped for detection, the gas supply is cut off, and the pressure is released, without affecting the detection of other battery packs.

[0016] According to another aspect of the present application, a gas tightness detection device is provided, which includes a battery pack gas tightness detection explosion protection device facing a production line EOL.

[0017] The present application has the following beneficial effects: The application enhances the redundancy and safety of the system by introducing an external pressure monitoring unit, an independent power supply circuit and a pressure signal acquisition channel, and the electrical connection of the interlocking output channel and the interlocking component. The external pressure monitoring unit can work independently of the air tightness detector, ensuring real-time pressure monitoring even if the built-in sensor fails, avoiding the risk of single point failure. Through the interlocking mechanism, the system can automatically cut off the gas source and release the pressure when the pressure exceeds the standard, effectively preventing equipment damage or safety accidents. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Fig. 1 The method flowchart described in an embodiment of the present application; Fig. 2 The device structure diagram described in an embodiment of the present application; Fig. 3 The air tightness detection and pressure monitoring linkage flowchart described in an embodiment of the present application; Fig. 4 The pressure abnormality interlocking response flowchart described in an embodiment of the present application; Explanation of reference numerals: 100, device; 10, sealed cavity; 101, gas inlet; 102, gas outlet; 103, pressure taking end; 20, air tightness detector; 30, external pressure monitoring unit; 301, power supply circuit; 302, pressure signal acquisition channel; 303, interlocking output channel; 304, interlocking component; 3041, signal interlocking piece; 3042, gas path electromagnetic valve; 3043, pressure relief electromagnetic valve. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0021] Example one: Please refer to Figs. 1-4The embodiment provides a battery pack air tightness detection explosion protection method for a production line EOL. In the embodiment, a measured object is arranged in a sealed cavity 10, and an air inlet 101 and an air outlet 102 of the sealed cavity 10 are respectively connected with an air tightness detector 20. The air tightness detector 20 is used for outputting alarm state information when the pressure in the sealed cavity 10 is abnormal, and as a core component of a monitoring system, is responsible for continuously monitoring the air tightness of the measured object. The pressure abnormality in the sealed cavity 10 can be caused by various reasons, for example, air source fluctuation, pipeline pollution and the like, and if not found and processed in time, can cause equipment damage or even safety accidents. Specifically, the application introduces an external pressure monitoring unit 30 to enhance the monitoring ability of pressure change and avoid system failure caused by single point failure in the traditional scheme.

[0022] The embodiment comprises the following steps: S10, a pressure taking end 103 is arranged in the sealed cavity 10, which is used for collecting the pressure signal in the sealed cavity 10 in real time and outputting the pressure signal to the external pressure monitoring unit 30. The function of the pressure taking end 103 is to accurately monitor the air pressure change in the sealed cavity 10, and to provide data support for subsequent pressure determination. The external pressure monitoring unit 30 has a power supply circuit 301 and a pressure signal acquisition channel 302 independent of the air tightness detector 20, so that it can still operate independently when the air tightness detector 20 fails, and accurately receive the pressure signal from the pressure taking end 103. The external pressure monitoring unit 30 ensures its continuous working state through its independent power supply circuit 301, and receives and processes the pressure signal from the pressure taking end 103 through the pressure signal acquisition channel 302. The external pressure monitoring unit 30 is also electrically connected with an interlocking component 304 through an interlocking output channel 303. After receiving the control signal from the external pressure monitoring unit 30, the interlocking component 304 can execute the operations of stopping detection, cutting off gas supply and releasing pressure, so as to ensure that the system can respond in time when abnormal pressure occurs, and to ensure the safety and reliability of the equipment.

[0023] S20, based on the pressure signal collected by the external pressure monitoring unit 30, the pressure change in the sealed cavity 10 is monitored in real time. The external pressure monitoring unit 30 continuously receives the pressure data from the pressure taking end 103, and processes these signals through its built-in algorithm. The system compares the currently collected pressure signal with the preset safety threshold to determine whether the pressure in the sealed cavity 10 exceeds the preset safety threshold. If the pressure exceeds the safety threshold, the external pressure monitoring unit 30 will immediately generate an alarm signal and provide data support for subsequent interlocking protection measures. This real-time monitoring function ensures that the pressure abnormality can be quickly and accurately responded to, and prevents damage to the equipment or safety hazards caused by excessive pressure.

[0024] S30, when the external pressure monitoring unit 30 determines that the pressure in the sealed cavity 10 exceeds the preset safety threshold, and the air tightness detector 20 fails to output the alarm state information in time, the external pressure monitoring unit 30 sends a control signal to the interlocking component 304 through the interlocking output channel 303. After the signal interlocking component 3041 receives the control signal, it first drives the gas path electromagnetic valve 3042 to close, cutting off the gas inlet 101 of the sealed cavity 10, preventing the gas from further entering and causing the pressure to continue to rise. Subsequently, the signal interlocking component 3041 further drives the pressure relief electromagnetic valve 3043 to open, discharging the excess gas in the sealed cavity 10, thereby effectively reducing the pressure in the cavity and preventing damage to the equipment caused by excessive pressure. This process automatically performs the protection operation of stopping detection, cutting off the gas source and pressure relief through the interlocking mechanism when the air tightness detector 20 fails to respond in time, to ensure the safety of the equipment and personnel, and to avoid safety accidents or equipment failures caused by abnormal pressure.

[0025] In the present embodiment, the interlocking component 304 includes a signal interlocking component 3041, a gas path electromagnetic valve 3042 and a pressure relief electromagnetic valve 3043. The signal interlocking component 3041 is electrically connected with the interlocking output channel 303 and the air tightness detector 20, and receives the determination result of the external pressure monitoring unit 30. When the external pressure monitoring unit 30 determines that the pressure in the sealed cavity 10 exceeds the preset safety threshold, and the air tightness detector 20 does not output the alarm state information, the signal interlocking component 3041 sends a control signal to the air tightness detector 20 through the interlocking output channel 303, instructing it to stop detection.

[0026] The gas path electromagnetic valve 3042 is arranged between the air tightness detector 20 and the gas inlet 101 of the sealed cavity 10, and is electrically connected with the signal interlocking component 3041. When the external pressure monitoring unit 30 determines that the pressure exceeds the preset safety threshold, and the air tightness detector 20 does not alarm, the signal interlocking component 3041 sends a control signal to the gas path electromagnetic valve 3042 through the interlocking output channel 303, cutting off the gas entering the sealed cavity 10, preventing the gas pressure from continuing to rise.

[0027] The pressure relief electromagnetic valve 3043 is arranged between the air tightness detector 20 and the gas outlet 102 of the sealed cavity 10, and is electrically connected with the signal interlocking component 3041. When the pressure exceeds the standard and the air tightness detector 20 does not alarm, the signal interlocking component 3041 controls the pressure relief electromagnetic valve 3043 through the interlocking output channel 303 to release the gas in the sealed cavity 10, reduce the pressure in the cavity, and prevent safety hazards caused by excessive pressure.

[0028] Through the coordinated work of the signal interlocking part 3041, the gas circuit electromagnetic valve 3042, and the pressure relief electromagnetic valve 3043, when the pressure in the sealed cavity 10 abnormally rises and the air tightness detector 20 does not respond, the system can quickly take measures to cut off the gas source and release the pressure, significantly improving the safety and reliability of the system. This scheme is especially suitable for battery pack production line EOL detection process that requires high safety, ensuring the safety of the equipment and operating personnel.

[0029] In this embodiment, the power supply circuit of the external pressure monitoring unit 30 is connected to an independent power supply and is isolated from the power supply system of the air tightness detector 20. This design ensures that even if the air tightness detector 20 fails or loses power, the external pressure monitoring unit 30 can continue to operate and monitor the pressure. By being powered by an independent power supply, the external pressure monitoring unit 30 can work independently in any situation, ensuring the continuous monitoring function of the system and avoiding monitoring failure due to failure or power failure of the air tightness detector 20.

[0030] In addition, the pressure signal collected by the pressure collection end 103 is output to the external pressure monitoring unit 30 through a pressure signal collection channel 302 independent of the air tightness detector 20. This independent signal transmission channel ensures the reliability and independence of the pressure data, so that even if the air tightness detector 20 fails or loses power, the external pressure monitoring unit 30 can still accurately acquire and process the pressure signal in the sealed cavity 10 and output control signals in a timely manner.

[0031] Through this design, even in the case of power failure or equipment failure of the air tightness detector 20, the external pressure monitoring unit 30 can continue to monitor the pressure in the sealed cavity 10 in real time and output control signals according to the preset safety threshold, ensuring the safety of the system. The external pressure monitoring unit 30 can independently perform monitoring tasks and control functions, further improving the fault tolerance and safety of the system. This design is particularly suitable for production line EOL links that require high reliability and safety, effectively preventing safety hazards caused by air tightness detector 20 failure.

[0032] Embodiment Two: Please refer to Figs. 2 to 4 , the present embodiment provides a battery pack air tightness detection explosion protection device for production line EOL, which effectively ensures the safety and reliability of the air tightness detection of the measured object during the production process through the coordinated work of the sealed cavity 10, the air tightness detector 20, the external pressure monitoring unit 30, and the interlocking part 304.

[0033] In the embodiment, the sealed cavity 10 serves as a container for the measured object, the measured object is placed in the sealed cavity 10, and the gas inlet 101 and the gas outlet 102 of the sealed cavity are respectively connected to the air tightness detector 20. When the pressure in the sealed cavity 10 is abnormal, the air tightness detector 20 will immediately output an alarm state information to prompt the operator to take appropriate measures.

[0034] Specifically, the device is provided with a pressure taking end 103, which is used to collect the pressure signal in the sealed cavity 10 in real time and transmit the collected pressure signal to the external pressure monitoring unit 30. The external pressure monitoring unit 30 has a power supply circuit 301 and a pressure signal collection channel 302 independent of the air tightness detector 20, which ensures that it can still operate independently when the air tightness detector 20 fails. Through the power supply mode of the independent power supply, the external pressure monitoring unit 30 can continuously monitor the pressure in the sealed cavity 10 in real time, avoiding the risk caused by single point failure.

[0035] The external pressure monitoring unit 30 will monitor the pressure change in the sealed cavity 10 in real time based on the collected pressure signal, and determine whether the pressure exceeds the safety threshold according to the preset safety threshold. If the pressure exceeds the safety threshold, the external pressure monitoring unit 30 will trigger the interlocking mechanism. The interlocking mechanism is composed of a signal interlocking piece 3041, a gas circuit electromagnetic valve 3042 and a pressure relief electromagnetic valve 3043. After receiving the control signal of the external pressure monitoring unit 30, the signal interlocking piece 3041 drives the gas circuit electromagnetic valve 3042 to close, cutting off the gas inlet 101 of the sealed cavity 10 to prevent the pressure from continuing to rise.

[0036] More specifically, when the external pressure monitoring unit 30 detects an abnormal pressure and the air tightness detector 20 fails to output an alarm state information in time, the signal interlocking piece 3041 will send a control signal to the gas circuit electromagnetic valve 3042 through the interlocking output channel 303 to cut off the gas passage into the sealed cavity 10, preventing the pressure from continuing to rise. Subsequently, the signal interlocking piece 3041 continues to send a control signal to the pressure relief electromagnetic valve 3043 through the interlocking output channel 303 to open the pressure relief electromagnetic valve 3043, to release the excess gas in the sealed cavity 10 and rapidly reduce the pressure in the cavity.

[0037] The independent power supply circuit 301 and the pressure signal collection channel 302 of the external pressure monitoring unit 30 enable the entire pressure monitoring system to work independently of the air tightness detector 20, so that even if the air tightness detector 20 fails or stops, the external pressure monitoring unit 30 can still perform pressure monitoring and start the interlocking protection measures. At the same time, the introduction of the interlocking protection mechanism ensures that when the air tightness detector 20 fails to respond in time, the gas source can be automatically cut off and the pressure can be released to terminate the abnormal pressure rising process, thereby preventing equipment damage or safety hazards caused by overpressure.

[0038] The device is particularly suitable for battery pack production line EOL detection process with high safety requirements. In this application scenario, the measured object needs to undergo strict airtightness detection to ensure its safety during use. By introducing an external pressure monitoring unit 30 and an interlock protection mechanism, the protection measures can be automatically triggered when the airtightness detector 20 fails to respond in time, cutting off the gas source and releasing the pressure, significantly improving the reliability and safety of the system. In addition, the independent operation of the external pressure monitoring unit 30 ensures that the system can still work normally in the event of equipment failure, providing effective protection for battery pack production and quality control.

[0039] The device of the present embodiment integrates airtightness detection, pressure monitoring and interlock protection functions to form an efficient and safe automated detection system, effectively reducing the risks caused by human operational errors and system failures, ensuring that the airtightness of the battery pack meets the requirements during production, thereby improving the overall production efficiency and product safety of the production line.

[0040] The present embodiment provides an airtightness detection device designed for airtightness detection of multiple battery packs, equipped with an external pressure monitoring unit 30, an airtightness detector 20, an interlock component 304 and other key components.

[0041] Specifically, the core function of the airtightness detection device is to monitor the pressure of each sealed cavity 10 where the battery pack 20 is located through the external pressure monitoring unit 30, and to determine whether there is an abnormality according to the pre-set safety threshold. If the pressure in a certain sealed cavity 10 exceeds the pre-set safety threshold and the airtightness detector 20 fails to output the alarm state information in time, the external pressure monitoring unit 30 will drive the signal interlocking piece 3041, the gas path electromagnetic valve 3042 and the pressure relief electromagnetic valve 3043 through the interlocking output channel 303, execute the protection measures of stopping detection, cutting off gas supply and releasing pressure, thereby preventing high pressure from causing damage to the battery pack 20 and the equipment.

[0042] In addition, the external pressure monitoring unit 30 can simultaneously receive pressure signals from multiple sealed cavities 10 and set independent pre-set safety thresholds and interlocking output channels 303 for each sealed cavity. This design ensures that even when multiple battery packs are being detected at the same time, if an abnormal pressure occurs in one of them, the system can still accurately take measures to cut off the gas source and release the pressure without affecting the detection process of other battery packs.

[0043] The air tightness detection equipment of this embodiment realizes parallel monitoring and independent control of multiple battery packs by integrating the detection functions of multiple battery packs, improves the detection efficiency and safety of the production line. At the same time, through independent monitoring and protection mechanism, when an abnormality occurs in a certain battery pack, the equipment can quickly respond and take protective measures, thereby avoiding the stagnation of the entire detection process due to a single fault, ensuring the stable operation and safety of the production line.

[0044] The air tightness detection equipment is very suitable for battery pack production line EOL detection links that require high efficiency, safety and high reliability, can greatly improve the air tightness detection capability of the battery pack, and ensure the safety of the equipment and personnel in the production process.

[0045] The present application enhances the redundancy and safety of the system by introducing an external pressure monitoring unit 30, an independent power supply circuit 301 and a pressure signal acquisition channel 302, and the electrical connection of the interlocking output channel 303 and the interlocking component 304. The external pressure monitoring unit 30 can work independently of the air tightness detector 20, even if the built-in sensor fails, real-time pressure monitoring can be ensured, and the risk brought by single point failure can be avoided. Through the interlocking mechanism, the system can automatically cut off the gas source and release the pressure when the pressure exceeds the standard, effectively preventing equipment damage or safety accidents.

[0046] The above described embodiments only express several embodiments of the present application, the description is more specific and detailed, but it cannot be understood as limiting the scope of the application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application.

Claims

1. A method for explosion-proof protection of battery pack airtightness detection for end-of-life (EOL) of a production line, wherein the battery pack is disposed in a sealed cavity, and the air inlet and outlet of the sealed cavity are respectively connected to an airtightness detector; when the pressure inside the sealed cavity is abnormal, the airtightness detector outputs alarm status information, characterized in that... The method includes the following steps: S10. A pressure tap is provided in the sealed cavity to collect and output pressure signals to an external pressure monitoring unit. The external pressure monitoring unit is provided with a power supply circuit and a pressure signal acquisition channel independent of the airtightness detector, and is provided with an interlock output channel electrically connected to the interlocking components used to stop detection, cut off gas supply and release pressure. S20. Based on the pressure signal collected by the external pressure monitoring unit, the pressure inside the sealed cavity is monitored in real time, and it is determined whether the pressure exceeds the preset safety threshold. S30. When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the airtightness detector does not output alarm status information, the interlocking component is driven through the interlocking output channel to perform: stop detection, cut off gas supply and release pressure to terminate the abnormal pressure rise process.

2. The method for explosion-proof protection of battery pack airtightness testing for end-of-life (EOL) of a production line according to claim 1, characterized in that, The interlocking components include: The signal interlocking component is electrically connected to the interlocking output channel and the airtightness detector, respectively, and is used to receive the judgment result of the external pressure monitoring unit. When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the airtightness detector does not output alarm status information, the signal interlocking component outputs a control signal to the airtightness detector through the interlocking output channel to control the airtightness detector to stop detection. A gas path solenoid valve is installed between the air tightness detector and the air inlet of the sealed cavity, and is electrically connected to the signal interlock component. When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the air tightness detector does not output alarm status information, the signal interlock component outputs a control signal to the gas path solenoid valve through the interlock output channel to cut off the gas from entering the sealed cavity. A pressure relief solenoid valve is installed between the air tightness detector and the air outlet of the sealed cavity, and is electrically connected to the signal interlock. When the external pressure monitoring unit determines that the pressure exceeds a preset safety threshold, and the air tightness detector does not output alarm status information, the signal interlock outputs a control signal to the pressure relief solenoid valve through the interlock output channel to release the gas in the sealed cavity and reduce the pressure in the sealed cavity.

3. The method for explosion-proof protection of battery pack airtightness testing for end-of-life (EOL) of a production line according to claim 2, characterized in that, When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the airtightness detector does not output alarm status information, the signal interlocking component generates and outputs a control signal, first driving the gas circuit solenoid valve to close, and then driving the pressure relief solenoid valve to open.

4. The method for explosion-proof protection of battery pack airtightness testing for end-of-life (EOL) of a production line according to claim 3, characterized in that, The power supply circuit of the external pressure monitoring unit is connected to an independent power supply and is isolated from the power supply system of the airtightness detector. The pressure signal collected by the pressure tapping end is output to the external pressure monitoring unit through a pressure signal acquisition channel independent of the airtightness detector. The airtightness detector can continue to monitor the pressure inside the sealed cavity and output control signals when the power is lost or the equipment malfunctions.

5. A method for explosion-proof protection of battery pack airtightness testing for end-of-life (EOL) of a production line according to claim 4, characterized in that, The external pressure monitoring unit simultaneously receives pressure signals from multiple sealed cavities and sets an independent preset safety threshold and interlock output channel for each sealed cavity. When the pressure in any of the sealed cavities exceeds the preset safety threshold and the airtightness detector does not output alarm status information, it only stops detection, cuts off the gas supply and releases pressure for the sealed cavity whose pressure exceeds the preset safety threshold, without affecting the detection of other battery packs.

6. A battery pack airtightness detection and explosion-proof protection device for end-of-life (EOL) testing on a production line, the device comprising: The battery pack, which is the object being tested, is housed within the sealed cavity. An airtightness detector, wherein the air inlet and outlet of the sealed cavity are respectively connected to the airtightness detector, and when the pressure inside the sealed cavity is abnormal, the airtightness detector outputs an alarm status information, characterized in that... The device further includes: A pressure tap is located inside the sealed cavity to collect and output pressure signals. An external pressure monitoring unit is connected to the pressure tapping end and has a power supply circuit and pressure signal acquisition channel independent of the airtightness detector, and receives the pressure signal through the pressure signal acquisition channel; The external pressure monitoring unit also includes: Interlocking components are used to stop detection, cut off gas supply, and release pressure. The interlocking output channel is electrically connected to the interlocking component. The interlocking components are connected to the airtightness detector and the pressure signal acquisition channel respectively, and monitor the pressure in the sealed cavity in real time based on the pressure signal to determine whether the pressure exceeds the preset safety threshold. When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the airtightness detector does not output alarm status information, the interlocking component is driven through the interlocking output channel to perform: stop detection, cut off gas supply and release pressure, so as to terminate the abnormal pressure rise process.

7. The explosion-proof protection device for battery pack airtightness testing for production line end-of-life (EOL) as described in claim 6, characterized in that, The interlocking components include: The signal interlocking component is electrically connected to the interlocking output channel and the airtightness detector, respectively, and is used to receive the judgment result of the external pressure monitoring unit. When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the airtightness detector does not output alarm status information, the signal interlocking component outputs a control signal to the airtightness detector through the interlocking output channel to control the airtightness detector to stop detection. A gas path solenoid valve is installed between the air tightness detector and the air inlet of the sealed cavity, and is electrically connected to the signal interlock component. When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the air tightness detector does not output alarm status information, the signal interlock component outputs a control signal to the gas path solenoid valve through the interlock output channel to cut off the gas from entering the sealed cavity. A pressure relief solenoid valve is installed between the air tightness detector and the air outlet of the sealed cavity, and is electrically connected to the signal interlock. When the external pressure monitoring unit determines that the pressure exceeds a preset safety threshold, and the air tightness detector does not output alarm status information, the signal interlock outputs a control signal to the pressure relief solenoid valve through the interlock output channel to release the gas in the sealed cavity and reduce the pressure in the sealed cavity.

8. The explosion-proof protection device for battery pack airtightness testing for production line end-of-life (EOL) as described in claim 7, characterized in that, When the external pressure monitoring unit determines that the pressure exceeds the preset safety threshold, and the airtightness detector does not output alarm status information, the signal interlocking component generates and outputs a control signal to first drive the gas circuit solenoid valve to close, and then drive the pressure relief solenoid valve to open. The power supply circuit of the external pressure monitoring unit is connected to an independent power supply and is isolated from the power supply system of the airtightness detector. The pressure signal collected by the pressure tapping end is output to the external pressure monitoring unit through a pressure signal acquisition channel independent of the airtightness detector. The airtightness detector can continue to monitor the pressure inside the sealed cavity and output control signals when the power is lost or the equipment malfunctions.

9. The explosion-proof protection device for battery pack airtightness testing for production line end-of-life (EOL) as described in claim 8, characterized in that, The external pressure monitoring unit simultaneously receives pressure signals from multiple sealed cavities and sets an independent preset safety threshold and interlock output channel for each sealed cavity. When the pressure in any of the sealed cavities exceeds the preset safety threshold and the airtightness detector does not output alarm status information, it only stops detection, cuts off the gas supply and releases pressure for the sealed cavity whose pressure exceeds the preset safety threshold, without affecting the detection of other battery packs.

10. An airtightness testing device, characterized in that, Includes the battery pack airtightness detection and explosion-proof protection device for production line EOL as described in any one of claims 6 to 9.

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