New energy automobile battery pack airtightness detection method and system

Abstract

The invention belongs to the technical field of new energy automobile battery packs, and discloses a new energy automobile battery pack airtightness detection method, which specifically comprises the following steps: S1, preparation work; s2, connecting detection equipment; s3, gas filling is carried out; s4, stabilizing the pressure; S5, detecting the pressure change; S6, judging the air tightness; and S7, recording and analyzing. By integrating the step of detecting the pressure change in the step S5 and the flow of judging the airtightness in the step S6, the airtightness detection work of the new energy automobile battery pack is remarkably optimized, the efficiency and the accuracy are greatly improved, real-time monitoring of the pressure change of the gas in the battery pack can be achieved through the combined scheme, any tiny pressure fluctuation cannot be avoided, and the detection accuracy of the new energy automobile battery pack is improved. Once the potential leakage problem is found, the system can respond quickly, and the current pressure value and leakage condition are recorded in time, so that valuable data are provided for subsequent maintenance and processing.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicle battery packs, and specifically relates to a method and system for airtight detection of new energy vehicle battery packs. Background Technique

[0002] The airtight detection method for new energy vehicle battery packs is a high-precision technical means aimed at evaluating the sealing performance of battery packs. This method determines whether there is a leak in the battery pack by filling a certain pressure of gas into the battery pack and monitoring the change of gas pressure over time. Currently, common detection methods include the pressure drop method and the helium leak detection method, which are widely used due to their high precision and fast response characteristics. The airtight detection system for new energy vehicle battery packs is an automated system integrating airtightness detection equipment, including components such as airtightness detectors, pipelines, connectors, and quick connectors or seals. By connecting to the battery pack and setting appropriate test parameters, the system can automatically complete the detection and output the results, providing strong guarantee for the safety and reliability of the battery pack. The existing airtight detection methods for new energy vehicle battery packs have obvious deficiencies, mainly relying on manual operation, which not only has low detection efficiency but also difficult to ensure the detection effect. Due to the limitations of manual operation, it is often impossible to accurately judge the airtight performance of the battery pack, leading to potential safety hazards. In addition, after the detection is completed, there is a lack of effective maintenance measures for the battery pack, which greatly reduces the management effect of the battery pack. Therefore, there is an urgent need for a more efficient and accurate automated airtight detection system and a complete supporting maintenance mechanism to improve the safety and management efficiency of new energy vehicle battery packs. Summary of the Invention

[0003] The purpose of the present invention is to provide a method and system for airtight detection of new energy vehicle battery packs to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A method for airtight detection of new energy vehicle battery packs, and the specific steps of the detection method are as follows:

[0005] S1: Preparation work: Ensure that the battery pack is clean, dry, and free of impurities, the connection parts are tightly fastened and undamaged, prepare and check the airtightness detection equipment to ensure that the pipeline connectors are tightly connected without leakage;

[0006] S2: Connect the detection equipment: Connect the battery pack and the airtightness detector with a quick connector, and set the inflation pressure and detection time parameters according to the instruction manual;

[0007] S3: Inflate the gas: Start the inflation function of the airtightness detector, inflate compressed air into the battery pack, monitor the pressure change, and ensure uniform and stable inflation;

[0008] S4: Stabilize the pressure: After inflation is complete, close the valve. Wait for the air pressure inside the battery pack to stabilize, and prevent external interference during this period to ensure that there are no abnormal fluctuations in pressure.

[0009] S5: Detect pressure changes: Use an airtightness detector to monitor the air pressure changes inside the battery pack. If the pressure drops rapidly, it indicates that the battery pack is leaking, and records should be made and inspections carried out.

[0010] S6: Judge airtightness: Based on the detection data, if the pressure change is within the specified range, the airtightness is good; if it exceeds the range, it indicates that the battery pack is leaking.

[0011] S7: Record and analyze: Detailed records should be made of the detection time and pressure results, problems should be analyzed and summarized. If a leak is found, it should be located and recorded for subsequent repair.

[0012] Preferably, the specific steps of the preparatory work in S1 are as follows;

[0013] Step 1: Pretreat the battery pack:

[0014] Ensure that the surface and interior of the battery pack are clean and dry, remove all dust, moisture and other impurities that may affect the airtightness test results. Then carefully check the connection parts of the battery pack to ensure they are tightly fastened without looseness, and there are no signs of damage or aging to prevent gas leakage through these parts during the test.

[0015] Step 2: Check and prepare the airtightness detection equipment:

[0016] Confirm that the airtightness detection equipment is in good working condition, and check whether the functions of its display screen, buttons and indicator lights are normal; Prepare and connect the pipelines and connectors required for the detection equipment to ensure tight connection and no leakage. Use special quick connectors or seals to connect the battery pack to the detection equipment.

[0017] Step 3: Set and calibrate the equipment:

[0018] According to the airtightness requirements of the battery pack, set appropriate test parameters on the detection equipment, including inflation pressure, test time, and pressure threshold;

[0019] Before starting the test, calibrate the detection equipment to ensure the accuracy of its measurement results; This usually includes zero calibration and full-scale calibration to ensure that the equipment can provide reliable data during the test.

[0020] Preferably, the connection of the detection equipment in S2 means that when performing the airtightness detection of the new energy vehicle battery pack, first, a special quick connector is needed to reliably connect the battery pack to the airtightness detector. Subsequently, according to the detailed instructions of the detector, the operator needs to carefully set the detection parameters, which include determining an appropriate inflation pressure that should be sufficient to detect potential minor leaks; and setting a reasonable detection time.

[0021] Preferably, the specific steps of filling gas in S3 are as follows:

[0022] Step 1: Activate the inflation function: First, turn on the airtightness detector and find and activate the inflation function.

[0023] Step 2: Set and monitor the inflation pressure: According to the operation interface or instruction manual of the detector, set the required inflation pressure value. After starting the inflation, closely monitor the change of gas pressure to ensure that the pressure rises steadily and automatically stops when it reaches the preset value.

[0024] Step 3: Ensure uniform inflation: During the inflation process, pay attention to observing the state of the battery pack to ensure that the gas can be evenly and stably filled into the battery pack. If any abnormality is found, including pressure fluctuation or gas leakage, stop the inflation immediately and check the connection part and the state of the battery pack.

[0025] Preferably, the specific steps of stabilizing the pressure in S4 are as follows:

[0026] Step 1: Close the inflation valve: Once the preset inflation pressure is reached, immediately close the inflation valve of the airtightness detector to stop inflating the battery pack.

[0027] Step 2: Wait for the pressure to stabilize: After closing the valve, let the gas inside the battery pack stabilize naturally for a period of time.

[0028] Step 3: Monitor the pressure change: During the stabilization period, continuously monitor the change of gas pressure to ensure that there is no external factor interfering with the gas pressure to obtain accurate test results.

[0029] Preferably, the detection of pressure change in S5 means that after completing the inflation and allowing the gas pressure inside the battery pack to stabilize for a period of time, next, the monitoring function of the airtightness detector needs to be used to observe and record the change of the gas pressure inside the battery pack over time; through monitoring, it can be intuitively seen whether the gas pressure gradually decreases over time. Observing that the pressure drops too fast is usually a warning signal indicating that there is a leakage problem in the battery pack. At this time, stop the test immediately and carefully check the sealing part of the battery pack to determine the specific location and cause of the leakage.

[0030] Preferably, the specific steps of judging airtightness in S6 are as follows:

[0031] Step 1: Activate the monitoring function: First, use the airtightness detector to activate the monitoring function and start recording the change of the gas pressure inside the battery pack.

[0032] Step 2: Observe the pressure change: During the monitoring process, closely pay attention to the change of gas pressure over time. If it is observed that the pressure drops rapidly, this usually indicates that there is a leakage in the battery pack.

[0033] Step 3: Record and inspect: Once it is confirmed that there is a leak in the battery pack, the current pressure value and the leakage situation shall be recorded immediately, and the monitoring shall be stopped. Subsequently, the battery pack shall be carefully inspected to determine the specific location and cause of the leak.

[0034] Preferably, the specific steps of recording and analyzing in S7 are as follows:

[0035] Step 1: Record the test results in detail: After the test is completed, record the test time, inflation pressure, and key information on pressure change in detail.

[0036] Step 2: Analyze the test results: Deeply analyze the recorded data, compare the pressure change with the specified range to judge whether the airtightness of the battery pack is qualified; if it is found that the pressure change exceeds the specified range, it indicates that there is a leak problem in the battery pack and further treatment is required.

[0037] Step 3: Locate the leak point and record information: If it is confirmed that there is a leak in the battery pack, professional tools or methods shall be used to locate the leak point and record relevant information, including the leak location and the degree of leakage.

[0038] Preferably, the system includes a pretreatment control module, an equipment inspection and preparation control module, a connection control module, an inflation control module, a pressure stability control module, a pressure change monitoring control module, an airtightness judgment control module, and a recording and analysis control module.

[0039] The pre - processing control module is responsible for the cleaning and drying of the battery pack, as well as the tightening inspection of the connection parts; the equipment inspection and preparation control module is responsible for confirming that the airtightness detection equipment is in good condition, including the display screen, buttons, and indicator lights, and preparing the connection pipeline joints to ensure no leakage. At the same time, it sets the calibration inflation pressure, test time, and pressure threshold parameters; the connection control module connects the battery pack and the detector with a special quick connector and sets the inflation pressure and detection time parameters according to the instruction manual; the inflation control module is responsible for starting the inflation of the detector, setting and monitoring the pressure to rise steadily to the preset value and then automatically stopping to ensure that the gas is evenly and stably filled into the battery pack; the pressure stability control module is responsible for closing the inflation valve and stopping the continuous inflation into the battery pack; waiting for the gas inside the battery pack to naturally stabilize for a period of time; monitoring the pressure change to ensure that there is no external factor interfering with the gas pressure; the pressure change monitoring module uses the detector to monitor the gas pressure change inside the battery pack, records the data, and analyzes the pressure drop speed to judge whether there is a leakage in the battery pack to ensure the accuracy of the detection result; the airtightness judgment control module judges whether the airtightness of the battery pack is qualified according to the detection data. If the pressure change exceeds the specified range, it issues a leakage alarm; the recording and analysis control module is responsible for recording the detection results in detail, covering the detection time, inflation pressure, and pressure change, deeply analyzing the data and comparing it with the specified range. Once a leakage is confirmed, it immediately locates the leakage point and records the relevant information in detail for subsequent processing.

[0040] The beneficial effects of the present invention are as follows:

[0041] By integrating the step of detecting pressure change in S5 and the process of judging airtightness in S6 of the present invention, the airtightness detection work of the new - energy vehicle battery pack is significantly optimized, and both the efficiency and accuracy are greatly improved. Such a combined solution can realize the real - time monitoring of the gas pressure change inside the battery pack, and any tiny pressure fluctuation cannot escape its "sharp eyes". Once a potential leakage problem is found, the system can respond quickly, record the current pressure value and leakage situation in time, providing valuable data for subsequent maintenance and processing. More importantly, this process can guide the staff to quickly and accurately locate the leakage point, avoiding over - testing or misjudgment of the battery pack, thus effectively ensuring the safety and reliability of the battery pack. Generally speaking, this combination not only improves the detection efficiency but also optimizes the management level, providing a solid guarantee for the safe operation of new - energy vehicles. Description of the Drawings

[0042] Figure 1 It is a schematic diagram of the specific process of the detection method of the present invention. Detailed Embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] As Figure 1 shown, the embodiments of the present invention provide a method for airtight detection of a new energy vehicle battery pack. The specific steps of the detection method are as follows:

[0045] S1: Preparation: Ensure that the battery pack is clean, dry, and free of impurities, the connection parts are tightly fastened and undamaged, prepare and check the airtightness detection equipment, and ensure that the pipeline joints are tightly connected without leakage;

[0046] S2: Connect the detection equipment: Connect the battery pack and the airtightness detector with a quick connector, and set the inflation pressure and detection time parameters according to the instruction manual;

[0047] S3: Inflate the gas: Start the inflation function of the airtightness detector, inflate compressed air into the battery pack, monitor the pressure change, and ensure uniform and stable inflation;

[0048] S4: Stabilize the pressure: After inflation, close the valve, wait for the air pressure in the battery pack to stabilize, and prevent external interference during this period to ensure that there is no abnormal change in pressure;

[0049] S5: Detect the pressure change: Use the airtightness detector to monitor the air pressure change in the battery pack. If the pressure drops rapidly, it indicates that the battery pack leaks, and it is necessary to record and check;

[0050] S6: Judge the airtightness: According to the detection data, if the pressure change is within the specified range, the airtightness is good; if it exceeds, it indicates that the battery pack leaks;

[0051] S7: Record and analyze: Detail the results such as the detection time and pressure, analyze and summarize the problems, and locate and record immediately when leakage is found for subsequent repair.

[0052] Among them, the specific steps of the preparation work in S1 are as follows;

[0053] Step 1: Pretreatment of the battery pack:

[0054] Ensure that the surface and inside of the battery pack are clean and dry, remove all dust, moisture, and other impurities that may affect the airtightness test results, and then carefully check the connection parts of the battery pack (such as bolts, gaskets, etc.) to ensure that they are tightly fastened without looseness, and there are no signs of damage or aging to prevent gas from leaking through these parts during the test;

[0055] Step 2: Check and prepare the airtightness detection equipment:

[0056] Confirm that the airtightness detection equipment is in good working condition, and check whether the functions of its display screen, buttons, indicator lights, etc. are normal; prepare and connect the pipelines and connectors required for the detection equipment to ensure tight connection and no leakage, and use special quick connectors or seals to connect the battery pack to the detection equipment; ensure the accuracy of the test.

[0057] Step 3: Set and calibrate the equipment:

[0058] According to the airtightness requirements of the battery pack, set appropriate test parameters on the detection equipment, including inflation pressure, test time, pressure threshold, etc.;

[0059] Before starting the test, calibrate the detection equipment to ensure the accuracy of its measurement results; this usually includes zero calibration and full-scale calibration to ensure that the equipment can provide reliable data during the test.

[0060] The preparatory work in S1 ensures the accuracy of the test: Pretreat the battery pack, remove impurities and tighten the connection parts to prevent test leakage; check and prepare the airtightness detection equipment to ensure its normal function and tight connection; set and calibrate the equipment, set the test parameters according to the requirements of the battery pack, and perform zero and full-scale calibration. This series of steps improves the accuracy and reliability of the test, lays a solid foundation for subsequent detection, and ensures the accuracy of the airtightness assessment of the battery pack.

[0061] Among them, the connection of the detection equipment in S2 means that when performing the airtightness detection of the new energy vehicle battery pack, it is first necessary to use a special quick connector to reliably connect the battery pack to the airtightness detector. This step is crucial because it ensures the stable flow of gas and accurate measurement during the test. Subsequently, according to the detailed instructions of the detector, the operator needs to carefully set the detection parameters, which include determining the appropriate inflation pressure, which should be sufficient to detect potential small leaks; and setting a reasonable detection time to ensure the accuracy and reliability of the test results. Correctly setting these parameters is the key step to ensure the smooth progress of the airtightness detection process and obtain meaningful results.

[0062] Among them, the specific steps of filling gas in S3 are as follows:

[0063] Step 1: Start the inflation function: First, turn on the airtightness detector and find and activate the inflation function. Ensure that the detector is in standby or ready state to start the inflation process.

[0064] Step 2: Set and monitor the inflation pressure: According to the operation interface or instructions of the detector, set the required inflation pressure value. After starting the inflation, closely monitor the change of gas pressure to ensure that the pressure rises steadily and stops automatically when it reaches the preset value;

[0065] Step 3: Ensure uniform inflation: During the inflation process, observe the status of the battery pack to ensure that gas can be evenly and stably filled into the battery pack. If any abnormalities are found, including pressure fluctuations or gas leaks, immediately stop inflation and check the connection parts and the status of the battery pack.

[0066] The standardized process of filling gas in S3 ensures the smooth progress of the airtightness detection: After starting the inflation function, the inflation pressure can be accurately set and monitored to avoid overpressure or underpressure; ensuring that the gas is evenly and stably filled into the battery pack improves the accuracy of the test; during real-time monitoring, once an abnormality is found, immediately stop and check, effectively preventing potential safety hazards and ensuring the safety and efficiency of the test process.

[0067] Among them, the specific steps for stabilizing the pressure in S4 are as follows:

[0068] Step 1: Close the inflation valve: Once the preset inflation pressure is reached, immediately close the inflation valve of the airtightness detector to stop further inflation into the battery pack.

[0069] Step 2: Wait for the pressure to stabilize: After closing the valve, let the gas inside the battery pack naturally stabilize for a period of time. The length of this period should be determined according to the detector instruction manual or test standards, usually several minutes.

[0070] Step 3: Monitor the pressure change: During the stabilization period, continuously monitor the change of gas pressure to ensure that there are no external factors (such as temperature fluctuations, vibrations, etc.) interfering with the gas pressure to obtain accurate test results.

[0071] Conducting the airtightness detection according to the above steps can ensure the accuracy of the test results: After closing the inflation valve, the gas pressure is stabilized, avoiding over-inflation; during the waiting period, letting the gas naturally stabilize reduces the interference of external factors; continuously monitoring the pressure change can promptly detect any minor leaks, thus ensuring a reliable assessment of the airtightness of the battery pack. This series of operation specifications improves the accuracy and credibility of the test.

[0072] Among them, detecting the pressure change in S5 means that after completing inflation and allowing the gas pressure inside the battery pack to stabilize for a period of time, next, the monitoring function of the airtightness detector needs to be used to observe and record the change of the gas pressure inside the battery pack over time; through monitoring, visually see whether the gas pressure gradually decreases over time. Observing that the pressure drops too fast is usually a warning signal, indicating that there may be a leakage problem with the battery pack. At this time, immediately stop the test and carefully check the sealing parts of the battery pack to determine the specific location and cause of the leakage.

[0073] Among them, the specific steps for judging the airtightness in S6 are as follows:

[0074] Step 1: Activate the monitoring function: First, use an airtightness tester to activate the monitoring function and start recording the gas pressure changes inside the battery pack.

[0075] Step 2: Observe the pressure changes: During the monitoring process, closely monitor the changes in gas pressure over time. If a rapid pressure drop is observed, this usually indicates a leak in the battery pack.

[0076] Step 3: Record and inspect: Once it is confirmed that the battery pack has a leak, immediately record the current pressure value and the leak situation, and stop the monitoring. Subsequently, conduct a careful inspection of the battery pack to determine the specific location and cause of the leak.

[0077] After activating the monitoring function, it is possible to track the gas pressure changes inside the battery pack in real time, detect leakage problems in a timely manner; observe the pressure changes, quickly identify potential risks, and ensure the safety of the battery pack; once a leak is confirmed, immediately record and stop the monitoring, which is convenient for subsequent detailed inspection, accurately locate the leak position and cause, effectively improve the detection efficiency and accuracy, and ensure the overall performance of the battery pack.

[0078] Among them, the specific steps of recording and analysis in S7 are as follows:

[0079] Step 1: Record the test results in detail: After the test is completed, record in detail the test time, inflation pressure, and key information on pressure changes.

[0080] Step 2: Analyze the test results: Conduct an in-depth analysis of the recorded data, compare the pressure changes with the specified range to determine whether the airtightness of the battery pack is qualified; if it is found that the pressure changes exceed the specified range, it indicates that there is a leak problem in the battery pack and further treatment is required.

[0081] Step 3: Locate the leak point and record information: If it is confirmed that the battery pack has a leak, use professional tools or methods to locate the leak point and record relevant information, including the leak position, leak degree, etc.

[0082] Detailed recording and analysis are crucial in the airtightness test of the battery pack. The benefits are as follows: By recording in detail the test time, inflation pressure, and pressure changes, the state of the battery pack can be comprehensively reflected; through in-depth data analysis, it can accurately determine whether the airtightness of the battery pack is qualified and detect leakage problems in a timely manner; once a leak is confirmed, locating the leak point and recording information helps to quickly take treatment measures. This series of steps ensures the safety and reliability of the battery pack and improves the detection efficiency and quality.

[0083] Among them, the system includes a preprocessing control module, an equipment inspection and preparation control module, a connection control module, an inflation control module, a pressure stability control module, a pressure change monitoring control module, an airtightness judgment control module, and a recording and analysis control module.

[0084] The pre - treatment control module is responsible for the cleaning and drying of the battery pack, as well as the tightening inspection of the connection parts; ensuring that the battery pack is in a state suitable for testing; the equipment inspection and preparation control module is responsible for confirming that the airtightness detection equipment is in good condition, including the display screen, buttons, and indicator lights, and preparing to connect the pipeline joints to ensure no leakage. At the same time, parameters such as calibration inflation pressure, test time, and pressure threshold are set;

[0085] The connection control module connects the battery pack and the detector with a special quick connector and sets parameters such as inflation pressure and detection time according to the instruction manual; the inflation control module is responsible for starting the inflation of the detector, setting and monitoring the pressure to rise steadily to the preset value and then automatically stopping to ensure that the gas is evenly and stably filled into the battery pack; the pressure stability control module is responsible for closing the inflation valve and stopping the continuous inflation into the battery pack; waiting for the gas inside the battery pack to stabilize naturally for a period of time; monitoring the pressure change to ensure that there is no external factor interfering with the gas pressure; the pressure change monitoring module uses the detector to monitor the gas pressure change inside the battery pack, records the data and analyzes the pressure drop speed to judge whether there is a leak in the battery pack to ensure the accuracy of the detection result; the airtightness judgment control module judges whether the airtightness of the battery pack is qualified according to the detection data. If the pressure change exceeds the specified range, a leak alarm is issued; the recording and analysis control module is responsible for recording the detection results in detail, covering the detection time, inflation pressure, and pressure change, etc., deeply analyzing the data and comparing it with the specified range. Once a leak is confirmed, the leak point is located immediately and relevant information is recorded in detail for subsequent processing.

[0086] This airtightness detection system is comprehensively designed and integrates multiple control modules such as pre - treatment, equipment inspection, connection, inflation, pressure stability, monitoring, judgment, and recording and analysis. Through pre - treatment, it ensures that the battery pack is in good test condition. Equipment inspection guarantees the accuracy of the test. Quick connection simplifies the operation process. Inflation control ensures that the gas is evenly and stably filled. Pressure stability control eliminates external interference. The combination of pressure change monitoring and airtightness judgment accurately judges whether the battery pack leaks. The recording and analysis module provides a detailed detection report for subsequent processing. The overall design improves the test efficiency and accuracy, ensures the airtightness quality of the battery pack, and provides a strong guarantee for the safe use of the battery.

[0087] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0088] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for detecting air tightness of a battery pack of a new energy vehicle, characterized in that: The specific steps of this detection method are as follows: S1: Preparation: Ensure that the battery pack is clean, dry and free of impurities, the connection parts are tight and intact, prepare and check the air tightness testing equipment, and ensure that the pipe joints are tight and leak-free; S2: Connect the testing equipment: Use the quick connector to connect the battery pack and the airtightness tester, and set the inflation pressure and testing time parameters according to the instructions; S3: Filling with gas: Start the airtightness detector's air filling function, fill the battery pack with compressed air, monitor the pressure changes, and ensure uniform and stable inflation; S4: Stabilize pressure: After inflation, close the valve and wait for the pressure in the battery pack to stabilize. During this period, prevent external interference and ensure that there is no abnormal pressure change. S5: Detect pressure changes: Use an airtightness tester to monitor the pressure changes in the battery pack. If the pressure drops rapidly, it indicates that the battery pack is leaking, which needs to be recorded and checked. S6: Determine air tightness: According to the test data, if the pressure change is within the specified range, the air tightness is good, and if it exceeds the specified range, it indicates that the battery pack is leaking; S7: Record and analyze: Record the test time and pressure results in detail, analyze and summarize the problems, locate and record any leaks for subsequent repairs.

2. A new energy vehicle battery pack airtightness detection method according to claim 1, characterized in that: The specific steps of the preparation work in S1 are as follows; Step 1: Battery pack pretreatment: Ensure that the surface and interior of the battery pack are clean and dry, remove all dust, moisture and other impurities that may affect the air tightness test results, and then carefully check the connection parts of the battery pack to ensure that they are not loose and have no signs of damage or aging to prevent gas leakage through these parts during the test; Step 2: Check and prepare air tightness testing equipment: Confirm that the air tightness test equipment is in good working condition, and check whether its display screen, buttons, and indicator lights are functioning normally; prepare and connect the pipes and joints required for the test equipment, ensure tight connection and no leakage, and use special quick connectors or seals to connect the battery pack and the test equipment; Step 3: Set up and calibrate equipment: According to the air tightness requirements of the battery pack, set appropriate test parameters on the testing equipment, including inflation pressure, test time, and pressure threshold; Before starting the test, the detection equipment is calibrated to ensure the accuracy of its measurement results; this usually includes zero calibration and full-scale calibration to ensure that the equipment can provide reliable data during the test.

3. A new energy vehicle battery pack airtightness detection method according to claim 1, characterized in that: The connecting detection equipment in S2 refers to that when conducting air tightness test on battery pack of new energy vehicle, the battery pack needs to be reliably connected to the air tightness tester using a dedicated quick connector. Subsequently, according to the detailed instruction manual of the tester, the operator needs to carefully set the detection parameters, which includes determining the appropriate inflation pressure, which should be sufficient to detect potential tiny leaks; and setting a reasonable detection time.

4. A new energy vehicle battery pack airtightness detection method according to claim 1, characterized in that: The specific steps of filling gas in S3 are as follows: Step 1: Start the inflation function: First, open the air tightness tester, find and activate the inflation function; Step 2: Set and monitor inflation pressure: Set the required inflation pressure value according to the operating interface or instructions of the detector. After starting inflation, closely monitor the changes in gas pressure to ensure that the pressure rises steadily and stops automatically when the preset value is reached; Step 3: Ensure uniform inflation: During the inflation process, pay attention to the status of the battery pack to ensure that the gas can be evenly and stably filled into the battery pack. If any abnormality is found, including pressure fluctuations or gas leakage, stop inflation immediately and check the connection parts and battery pack status.

5. A new energy vehicle battery pack airtightness detection method according to claim 1, characterized in that: The specific steps of stabilizing the pressure in S4 are as follows: Step 1: Close the inflation valve: Once the preset inflation pressure is reached, immediately close the inflation valve of the air tightness tester to stop inflating the battery pack; Step 2: Wait for the pressure to stabilize: After closing the valve, let the gas inside the battery pack stabilize naturally for a while; Step 3: Monitor pressure changes: During the stabilization period, continuously monitor changes in gas pressure to ensure that no external factors interfere with the gas pressure in order to obtain accurate test results.

6. A new energy vehicle battery pack airtightness detection method according to claim 1, characterized in that: The detection of pressure changes in S5 refers to the need to use the monitoring function of the airtightness tester to observe and record the changes in the gas pressure inside the battery pack over time after the inflation is completed and the gas pressure inside the battery pack is allowed to stabilize for a period of time. Through monitoring, it is intuitively seen whether the gas pressure gradually decreases over time. If the pressure drops too quickly, this is usually a warning signal, indicating that there is a leakage problem in the battery pack. At this time, the test should be stopped immediately and the sealing part of the battery pack should be carefully checked to determine the specific location and cause of the leakage.

7. A new energy vehicle battery pack airtightness detection method according to claim 1, characterized in that: The specific steps of judging air tightness in S6 are as follows: Step 1: Start the monitoring function: First, use the airtightness meter to start the monitoring function and start recording the changes in gas pressure inside the battery pack; Step 2: Observe pressure changes: During the monitoring process, pay close attention to the changes in gas pressure over time. If a rapid drop in pressure is observed, this usually indicates that there is a leak in the battery pack; Step 3: Record and check: Once it is confirmed that there is a leak in the battery pack, the current pressure value and leakage situation should be recorded immediately, and monitoring should be stopped. Subsequently, the battery pack should be carefully inspected to determine the specific location and cause of the leak.

8. A new energy vehicle battery pack airtightness detection method according to claim 1, characterized in that: The specific steps of recording and analyzing in S7 are as follows: Step 1: Record the test results in detail: After the test is completed, record the key information of the test time, inflation pressure, and pressure change in detail; Step 2: Analyze the test results: Conduct an in-depth analysis of the recorded data and compare the pressure change with the specified range to determine whether the air tightness of the battery pack is qualified; if the pressure change is found to be beyond the specified range, it indicates that there is a leakage problem in the battery pack and further treatment is required; Step 3: Locate the leak and record the information: If it is confirmed that the battery pack is leaking, use professional tools or methods to locate the leak and record relevant information, including the leak location and extent.

9. A new energy vehicle battery pack airtightness detection system, characterized in that: The system includes a pre-processing control module, an equipment inspection and preparation control module, a connection control module, an inflation control module, a pressure stabilization control module, a pressure change monitoring control module, an air tightness judgment control module, and a recording and analysis control module; The pretreatment control module is responsible for cleaning and drying the battery pack, as well as checking the tightness of the connection parts; the equipment inspection and preparation control module is responsible for confirming that the airtightness detection equipment is in good condition, including the display screen, buttons, indicator lights, and preparing to connect the pipe joints to ensure that there is no leakage, and setting the calibration inflation pressure, test time and pressure threshold parameters; the connection control module uses a special quick connector to connect the battery pack and the detector, and sets the inflation pressure and detection time parameters according to the instructions; the inflation control module is responsible for starting the detector to inflate, setting and monitoring the pressure to stably rise to the preset value and then automatically stop, to ensure that the gas is evenly and stably charged into the battery pack; the pressure stabilization control module is responsible for closing the inflation valve and stopping the further inflation into the battery pack; waiting for the gas inside the battery pack to stabilize naturally for a period of time; Monitor pressure changes to ensure that there are no external factors interfering with gas pressure; the pressure change monitoring module uses a detector to monitor gas pressure changes in the battery pack, records data and analyzes the pressure drop rate to determine whether there is a leak in the battery pack, ensuring the accuracy of the test results; the airtightness judgment control module determines whether the airtightness of the battery pack is qualified based on the test data. If the pressure change exceeds the specified range, a leakage alarm is issued; the recording and analysis control module is responsible for recording the test results in detail, covering the test time, inflation pressure and pressure changes, in-depth analysis of the data and comparison with the specified range. Once a leak is confirmed, the leak point is immediately located and relevant information is recorded in detail for subsequent processing.

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