Battery pack air-tightness testing apparatus and method

Abstract

A battery pack air-tightness testing apparatus and method. The testing apparatus comprises a sensor module (11), a processing device (12) and a testing device (13); the sensor module (11) is used for testing a battery pack (14) to be tested, to obtain an electric signal, and sending the electric signal to the processing device (12); and the processing device (12) is used for determining a leakage area of said battery pack (14) on the basis of the electric signal, and controlling the testing device (13) to test along the leakage area to obtain an air-tightness test result of the leakage area. The leakage area of said battery pack (14) is determined, and the leakage area is then tested, without testing the entire sealing interface of said battery pack (14), saving the testing time and improving the air-tightness testing efficiency.

Description

Battery Pack Air Tightness Testing Device and Testing Method

[0001] Cross-references

[0002] This application incorporates Chinese Patent Application No. 2024104945352, filed on April 23, 2024, entitled “Battery Pack Airtightness Testing Device and Testing Method”, which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to the field of battery pack airtightness testing technology, and in particular to a battery pack airtightness testing device and testing method. Background Technology

[0004] With the continuous development of new energy technologies, battery packs are widely used in electric vehicles, aircraft, ships, submarines and other equipment. The safety and performance of battery packs are of paramount importance. Therefore, it is necessary to conduct airtightness testing on battery packs to improve their safety and performance.

[0005] Currently, the battery pack is typically filled with helium, hydrogen, and carbon dioxide, and the airtightness of the battery pack is tested by scanning all the sealed interfaces of the battery pack with a testing device.

[0006] However, the current detection efficiency of battery pack airtightness testing is relatively low.

[0007] Summary of the Invention

[0008] Therefore, it is necessary to provide a battery pack airtightness testing device and method that can improve the efficiency of battery pack airtightness testing in response to the above-mentioned technical problems.

[0009] In a first aspect, this application provides a battery pack airtightness testing device, which includes a sensor module, a processing device, and a testing device;

[0010] The sensor module is used to detect the battery pack under test, obtain electrical signals, and send electrical signals to the processing equipment.

[0011] The processing equipment is used to determine the leakage area of ​​the battery pack under test based on electrical signals, and to control the detection equipment to perform detection along the leakage area in order to obtain the airtightness test result of the leakage area.

[0012] The detection device provided in this application includes a sensor module, a processing device, and a detection device. The sensor module is used to detect the battery pack under test to obtain an electrical signal and send the electrical signal to the processing device. The processing device is used to determine the leakage area of ​​the battery pack under test based on the electrical signal and control the detection device to perform detection along the leakage area to obtain the airtightness detection result of the leakage area. By first determining the leakage area of ​​the battery pack under test and then detecting the leakage area, it is not necessary to detect the entire sealing interface of the battery pack under test, thereby saving detection time and improving the detection efficiency of airtightness detection.

[0013] In one embodiment, the testing device further includes an air pumping line connected to the battery pack under test.

[0014] The processing equipment is used to control the gas extraction and filling pipeline to perform gas extraction and filling operations on the battery pack under test when the battery pack under test is in the first working position. The gas extraction and filling operation includes extracting gas from the battery pack under test and filling the battery pack under test with target gas. The gas extraction speed is less than the gas filling speed.

[0015] The sensor module is used to detect the battery pack under test and obtain electrical signals when the battery pack under test is transferred from the first station to the second station.

[0016] The detection device provided in this application embodiment controls the gas injection / injection pipeline to perform gas injection / injection operations on the battery pack under test when the processing equipment is in the first station. Meanwhile, the sensor module detects the battery pack under test and obtains an electrical signal when the battery pack is transferred from the first station to the second station. Because the gas injection / injection operation and the generation of the electrical signal are performed at different stations, the efficiency of batch testing of the airtightness of battery packs is improved.

[0017] In one embodiment, the detection device is located at the third station;

[0018] The processing equipment is used to control the detection equipment set at the third station to perform detection along the leak area in order to obtain the airtightness test results of the leak area.

[0019] The detection device provided in this application embodiment uses a detection device located at a third station to detect along the leakage area to obtain the airtightness detection result of the leakage area. This eliminates the need to scan and detect all sealing interfaces of the battery pack under test, improving the airtightness detection efficiency. Furthermore, since the detection device and sensor module are located at different stations, the detection device can continuously perform airtightness detection on different battery packs under test, improving the efficiency of batch airtightness detection and the utilization rate of the detection device. Simultaneously, when batch airtightness detection of battery packs under test is required, it is not necessary to equip a larger number of detection devices, thereby reducing the cost of the detection equipment.

[0020] In one embodiment, the air pumping pipeline includes a first pipeline and a second pipeline, the first pipeline being connected to a first vent hole of the battery pack under test, and the second pipeline being connected to a second vent hole of the battery pack under test.

[0021] The gas extraction and filling pipeline is used to extract gas from the battery pack under test through the first vent and to fill the battery pack under test with the target gas through the second vent.

[0022] In this embodiment, a first pipeline is connected to the first vent of the battery pack under test, and a second pipeline is connected to the second vent of the battery pack under test, thereby enabling the battery pack under test to be pumped and filled with gas, thus laying the foundation for detecting whether there is a leakage area in the battery pack under test.

[0023] In one embodiment, the first pipeline includes a first gas source and a first pressure regulating valve, wherein the first pressure regulating valve is disposed between the first gas source and the first vent.

[0024] The second pipeline includes a second air source and a second pressure regulating valve, with the second pressure regulating valve located between the second air source and the second vent.

[0025] The detection device provided in this application embodiment performs a gas injection and inflation operation on the battery pack under test by setting a first pressure regulating valve between a first gas source and a first vent, and setting a second pressure regulating valve between a second gas source and a second vent, thereby laying the foundation for detecting whether there is a leakage area in the battery pack under test.

[0026] In one embodiment, the detection device further includes a heating device disposed between the second pressure regulating valve and the second gas source;

[0027] Heating equipment is used to heat the target gas discharged from the second gas source.

[0028] The gas filling line is used to fill the battery pack under test with the heated target gas through the second vent.

[0029] The detection device provided in this application embodiment heats the target gas discharged from the second gas source through a heating device, and the heated target gas is injected into the battery pack under test through the pumping and charging pipeline from the second vent. This enables the high-temperature target gas to leak into the external environment when there is a sealing defect in the battery pack under test, so that the leakage area of ​​the battery pack under test can be detected by a thermal imaging detector.

[0030] In one embodiment, the detection device further includes a pressure detection device, the acquisition end of which extends into the internal space of the battery pack under test;

[0031] The gas extraction and inflation pipeline is used to extract the gas from the battery pack under test when the battery pack under test is in the first working position, until the pressure of the internal space of the battery pack under test collected by the acquisition end reaches the first preset pressure.

[0032] The air pressure detection device is used to detect the pressure change in the internal space of the battery pack under test within a first preset time period when the pressure in the internal space of the battery pack under test reaches a first preset pressure, and to send the pressure change to the processing device.

[0033] The processing equipment is used to control the gas injection and inflation operations of the battery pack under test in the gas injection and inflation pipeline according to the pressure change.

[0034] The detection device provided in this application determines whether there is a serious leakage defect in the battery pack under test based on the pressure change in the internal space of the battery pack under test. In this way, when there is no serious leakage defect in the battery pack under test, the gas pumping and filling pipeline is controlled to perform gas pumping and filling operations on the battery pack under test, thereby reducing the probability of performing gas pumping and filling operations on the battery pack under test when there is a serious leakage defect.

[0035] In one embodiment, the air pressure detection device is used to detect a first pressure in the internal space when the battery pack under test is being pumped or inflated, and to send the first pressure to the processing device;

[0036] Processing equipment for controlling inflation speed and / or deflation speed based on a first pressure and a preset pressure range.

[0037] The detection device provided in this application embodiment detects the first pressure of the internal space of the battery pack under test during the inflation / deflation operation and sends the first pressure to the processing device. The processing device controls the inflation speed and / or deflation speed according to the first pressure and a preset pressure range, thereby controlling the pressure of the internal space of the battery pack under test within the preset pressure range. In the event of a sealing defect in the battery pack under test, the target gas inside the battery pack can leak into the external environment. The sensor module detects the target gas leaking from the battery pack under test and generates an electrical signal, laying the foundation for detecting whether there is a leakage area in the battery pack under test.

[0038] In one embodiment, the processing device is configured to control the gas extraction and filling pipeline to continue the gas extraction and filling operation of the battery pack under test during the process of controlling the transfer device to transfer the battery pack under test from the first station to the second station.

[0039] The detection device provided in this application embodiment controls the gas extraction and filling pipeline to continue the gas extraction and filling operation of the battery pack under test during the process of controlling the transfer equipment to transfer the battery pack under test from the first station to the second station. This can make the target gas distribution in the battery pack under test more uniform, reduce the total time required for the transfer and gas extraction and filling operation of the battery pack under test, and thus further improve the efficiency of the airtightness detection of the battery pack under test.

[0040] In one embodiment, the processing device is configured to stop extracting gas from the battery pack under test when the duration of the gas extraction and inflation operation of the gas extraction and inflation pipeline reaches a second preset duration, and to inject target gas into the battery pack under test at a second preset pressure to perform constant pressure inflation of the battery pack under test.

[0041] The detection device provided in this application stops extracting gas from the battery pack under test when the duration of the gas extraction and inflation operation in the control gas extraction and inflation pipeline reaches a second preset duration, and then injects target gas into the battery pack under test at a second preset pressure to perform constant pressure inflation, thereby making the distribution of target gas in the battery pack under test more uniform.

[0042] In one embodiment, the processing device is used to control the transfer device to transfer the battery pack under test from the second station to the third station during the constant pressure inflation process of the battery pack under test.

[0043] The processing equipment is used to control the gas pumping pipeline to continue to pump the target gas into the battery pack under test at a second preset pressure during the process of transferring the battery pack under test to the third station.

[0044] The detection device provided in this application embodiment controls a transfer device to move the battery pack under test from the second station to the third station during the constant-pressure inflation process. This allows for simultaneous constant-pressure inflation and transfer of the battery pack, saving the total time required for both inflation and transfer, thus further improving the efficiency of airtightness testing. Furthermore, during the transfer of the battery pack to the third station, the inflation pipeline continues to inject the target gas into the battery pack at a second preset pressure, further ensuring a more uniform distribution of the target gas within the battery pack.

[0045] In one embodiment, the processing device is configured to control the detection device to perform detection along the leakage area after the constant pressure inflation time has reached a third preset time, so as to obtain the airtightness detection result of the leakage area.

[0046] The detection device provided in this application embodiment uses a detection device located at a third station to detect along the leakage area to obtain the airtightness detection result of the leakage area. This eliminates the need to scan and detect all sealing interfaces of the battery pack under test, improving the airtightness detection efficiency. Furthermore, since the detection device and sensor module are located at different stations, the detection device can continuously perform airtightness detection on different battery packs under test, improving the efficiency of batch airtightness detection and the utilization rate of the detection device. Simultaneously, when batch airtightness detection of battery packs under test is required, it is not necessary to equip a larger number of detection devices, thereby reducing the cost of the detection equipment.

[0047] In one embodiment, the detection device further includes a missed detection line, which includes a chamber connected to the battery pack under test.

[0048] The leak detection pipeline is used to detect the pressure difference between the battery pack under test and the chamber, and to send the pressure difference to the processing equipment.

[0049] Processing equipment is used to determine the airtightness test results of the battery pack under test based on the pressure difference.

[0050] The detection device provided in this application embodiment allows the processing equipment to determine the rate of change of the pressure difference based on the pressure difference. If the rate of change of the pressure difference is less than a preset rate of change, the airtightness test result of the battery pack under test can be determined as passed; if the rate of change of the pressure difference is not less than the preset rate of change, the airtightness test result of the battery pack under test can be determined as failed. By detecting the pressure difference between the battery pack under test and the chamber, whole-pack leak detection of the battery pack under test can be achieved, that is, the airtightness of the entire battery pack under test can be detected. This allows for the detection of other areas that the detection equipment cannot cover. Other areas refer to the sealing interface other than the aforementioned leakage area, thereby improving the comprehensiveness of the airtightness detection of the sealing interface of the battery pack under test.

[0051] In one embodiment, the leak detection pipeline further includes a third pressure regulating valve, with the first end of the differential pressure sensor connected to the first end of the third pressure regulating valve, and the second end of the chamber connected to the second end of the third pressure regulating valve.

[0052] A differential pressure sensor is used to detect the pressure difference when the second and third pressure regulating valves are closed, and to send the pressure difference to the processing equipment.

[0053] The detection device provided in this application embodiment detects the pressure difference when the second and third pressure regulating valves are closed, and sends the pressure difference to the processing equipment, thereby realizing the airtightness detection of the sealing interface that the detection equipment cannot cover, and improving the comprehensiveness of the airtightness detection of the sealing interface of the battery pack under test.

[0054] Secondly, this application also provides a method for testing the airtightness of a battery pack, the method comprising:

[0055] The sensor module detects the battery pack under test to obtain electrical signals and sends the electrical signals to the processing equipment;

[0056] The processing equipment receives electrical signals sent by the sensor module;

[0057] The processing equipment determines the leakage area of ​​the battery pack under test based on electrical signals and controls the detection equipment to perform detection along the leakage area;

[0058] When the detection equipment is used to detect along the leak area, the airtightness test results of the leak area are obtained.

[0059] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0060] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0061] Figure 1 is one of the structural schematic diagrams of the battery pack airtightness detection device provided in the embodiments of this application;

[0062] Figure 2 is a second schematic diagram of the structure of the battery pack airtightness testing device provided in the embodiment of this application;

[0063] Figure 3 is a flowchart illustrating the battery pack airtightness testing method provided in an embodiment of this application. Detailed Implementation

[0064] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0066] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0067] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0068] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0069] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0070] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0071] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0072] With the continuous development of new energy technologies, battery packs are widely used in electric vehicles, aircraft, ships, submarines and other equipment. The safety and performance of battery packs are of paramount importance. Therefore, it is necessary to conduct airtightness testing on battery packs to improve their safety and performance.

[0073] Currently, the battery pack is typically filled with helium, hydrogen, and carbon dioxide, and the airtightness of the battery pack is tested by scanning all the sealed interfaces of the battery pack with a testing device.

[0074] However, the current detection efficiency of battery pack airtightness testing is relatively low.

[0075] To address the aforementioned technical problems, this application provides a battery pack airtightness testing device. As shown in Figure 1, Figure 1 is one of the structural schematic diagrams of the battery pack airtightness testing device provided in this application embodiment. The device includes a sensor module 11, a processing device 12, and a testing device 13.

[0076] Sensor module 11 is used to detect the battery pack 14 under test to obtain electrical signals and send electrical signals to processing device 12;

[0077] The processing device 12 is used to determine the leakage area of ​​the battery pack 14 under test based on the electrical signal, and to control the detection device 13 to perform detection along the leakage area in order to obtain the airtightness detection result of the leakage area.

[0078] Sensor module 11 may include one or more sensors. For example, sensor module 11 may include at least one of a thermal imaging detector, a colorimeter, a photosensor, and an ultrasonic sensor. Alternatively, in addition to the sensors exemplified above, sensor module 11 may also include a charge-coupled device (CCD) vision sensor.

[0079] The detection device 13 may include a mass spectrometer, which may include a quadrupole mass spectrometer, a semiconductor hydrogen detector, etc.

[0080] The battery pack under test is filled with a target gas, which may include at least one tracer gas such as helium, hydrogen, carbon dioxide, photosensitive gas, or colored non-toxic gas. The target gas can be filled into the battery pack under test while it is in the first station. The sensor module 11 can be located at either the first or second station. When the sensor module 11 is located at the first station, if a sealing defect exists in the battery pack under test during the gas filling / evacuation operation, the sensor module 11 at the first station can detect the target gas leaking from the leak area. This allows for the generation of an electrical signal during the gas filling / evacuation operation, eliminating the need to wait for a period of time before detecting and generating an electrical signal, thereby further improving the efficiency of airtightness detection. For example, the leak area is the area marked by the thick solid line on the battery pack under test as shown in Figure 1.

[0081] When the sensor module 11 can be set at the second station, the inflation operation and the leak area detection operation can be separated, thereby improving the efficiency of airtightness detection. For example, while the sensor module 11 at the second station is detecting the electrical signal of the battery pack A under test, the target gas can be injected into the battery pack B under test at the first station. After the battery pack A under test is detected, the battery pack B under test can be transferred to the second station, where the sensor module 11 can then detect the battery pack B under test. This allows for continuous detection of multiple battery packs under test, thereby improving the efficiency of airtightness detection for multiple battery packs under test.

[0082] When a battery pack under test has a sealing defect, the target gas inside the battery pack may leak into the external environment. The sensor module 11 can detect the leaked target gas, generate an electrical signal based on the leaked target gas, and send the electrical signal to the processing device 12. For example, the target gas can be heated first, and a target gas with a higher temperature can be filled into the battery pack under test. In this way, the temperature of the target gas inside the battery pack under test is higher than the temperature of the external environment. The sensor module 11 is a thermal imaging detector. In this case, the thermal imaging detector can generate an electrical signal based on the temperature difference between the target gas temperature and the external environment temperature, and send the electrical signal to the processing device 12. The processing device 12 determines the leakage area of ​​the battery pack under test based on the electrical signal.

[0083] The processing device 12 can determine the leakage area of ​​the battery pack under test based on electrical signals in the following way:

[0084] In one possible implementation, the processing device 12 determines the initial leakage area based on the electrical signal and uses the initial leakage area as the leakage area of ​​the battery pack under test.

[0085] In another possible implementation, the processing device 12 determines the initial leakage area based on an electrical signal and amplifies the initial leakage area to obtain the leakage area of ​​the battery pack under test; this leakage area includes the initial leakage area. After amplifying the initial leakage area, the detection range can be expanded, thereby reducing the probability of missed detection of the leakage area.

[0086] Alternatively, the target gas can be directly introduced into the battery pack under test. The target gas may include a colored non-toxic gas. The sensor module 11 is a colorimeter. The colorimeter detects the color information of the colored non-toxic gas, generates an electrical signal based on the color information, and sends the electrical signal to the processing device 12. The processing device 12 determines the leakage area of ​​the battery pack under test based on the electrical signal.

[0087] Alternatively, sensor module 11 may include a thermal imaging detector and a colorimeter, which are used to detect leakage areas in the battery pack under test.

[0088] In this embodiment, after determining the leakage area of ​​the battery pack under test, the processing device 12 can control the detection device 13 to perform detection along the leakage area to obtain the airtightness test result of the leakage area. For example, the detection device 13 can be connected to a robotic arm, and the processing device 12 controls the robotic arm to move the detection device 13 and controls the detection device 13 to perform detection along the leakage area. This eliminates the need to control the detection device 13 to perform detection along the entire sealing interface of the battery pack under test, thereby saving detection time and improving detection efficiency.

[0089] The detection device provided in this application includes a sensor module 11, a processing device 12, and a detection device 13. The sensor module 11 is used to detect the battery pack under test to obtain an electrical signal and send the electrical signal to the processing device 12. The processing device 12 is used to determine the leakage area of ​​the battery pack under test based on the electrical signal and control the detection device 13 to perform detection along the leakage area to obtain the airtightness detection result of the leakage area. By first determining the leakage area of ​​the battery pack under test and then detecting the leakage area, it is not necessary to detect the entire sealing interface of the battery pack under test, thereby saving detection time and improving the detection efficiency of airtightness detection.

[0090] In one embodiment, the testing device further includes an air pumping line connected to the battery pack 14 under test.

[0091] Processing device 12 is used to control the gas extraction and filling pipeline to perform gas extraction and filling operations on the battery pack 14 under test when the battery pack 14 under test is in the first working position. The gas extraction and filling operation includes extracting gas from the battery pack 14 under test and filling the battery pack 14 under test with target gas. The gas extraction speed is less than the gas filling speed.

[0092] The sensor module 11 is used to detect the battery pack 14 under test and obtain electrical signals when the battery pack 14 under test is transferred from the first station to the second station.

[0093] The first workstation can be a production workstation that produces the battery pack 14 under test, or it can be a workstation other than a production workstation. When the first workstation is a production workstation, the gas filling and emptying operation of the battery pack 14 under test can be performed at the production workstation while the battery pack 14 under test is being produced, thereby improving the utilization rate of the production line.

[0094] The sensor module 11 can be located at the second station. When the sensor module 11 is located at the second station, the battery pack 14 under test can be transferred from the first station to the second station during the gas extraction and inflation operation, thereby enabling the sensor module 11 located at the second station to detect the target gas leaking from the leak area. Alternatively, after the gas extraction and inflation operation of the battery pack 14 under test is completed, the battery pack 14 under test can be transferred from the first station to the second station, thereby enabling the sensor module 11 located at the second station to detect the target gas leaking from the leak area.

[0095] It should be noted that the processing device 12 can control the transfer device to transfer the battery pack 14 under test from the first station to the second station if the gas pumping and filling operation lasts for a preset duration. This preset duration of gas pumping and filling operation can make the distribution of the target gas in the battery pack 14 under test more uniform, thereby enabling a more accurate determination of the leakage area of ​​the battery pack 14 under test based on the electrical signal.

[0096] In this embodiment, since the gas filling and evacuation operation of the battery pack 14 under test is performed at the first station, and the electrical signal is generated at the second station, the gas filling and evacuation operation and the electrical signal generation are not performed at the same station, thereby further improving the efficiency of airtightness testing. For example, after the gas filling and evacuation operation of the battery pack 14A under test at the first station has reached a preset time, the battery pack 14A under test can be transferred to the second station. During the transfer of the battery pack 14A to the second station, the battery pack 14B under test can be placed at the first station for gas filling and evacuation operation. In this way, gas filling and evacuation operations can be continuously performed on different battery packs 14 under test, and detection operations can be performed to check for leaks in different battery packs 14 under test, thereby improving the efficiency of airtightness testing of batches of battery packs 14 under test.

[0097] The detection device provided in this application embodiment, through the processing device 12, controls the gas injection / injection pipeline to perform gas injection / injection operations on the battery pack 14 under test when it is in the first station. Meanwhile, the sensor module 11 detects the battery pack 14 under test and obtains an electrical signal when it is transferred from the first station to the second station. Because the gas injection / injection operation and the generation of the electrical signal are not performed in the same station, the efficiency of batch testing of the airtightness of battery packs 14 is improved.

[0098] In one embodiment, as shown in FIG2, FIG2 is a second structural schematic diagram of the battery pack airtightness testing device provided in the embodiment of this application, wherein the testing device 13 is set at the third station.

[0099] Processing equipment 12 is used to control the detection equipment 13 set at the third station to perform detection along the leakage area in order to obtain the airtightness detection result of the leakage area.

[0100] The detection device 13 may include a probe 131 and a detector 132. The probe can draw in the target gas leaking from the leak area and transmit the drawn-in target gas to the detector. The detector determines the leakage rate of the target gas based on the target gas transmitted by the probe. If the leakage rate is greater than a preset leakage rate, it means that the airtightness test result is a failure; if the leakage rate is not greater than the preset leakage rate, it means that the airtightness test result is a pass. A robotic arm can be used to carry the probe along the leak area to scan and detect the target gas leaking from the leak area.

[0101] The detection device provided in this application embodiment uses a detection device 13 located at the third station to detect along the leakage area to obtain the airtightness detection result of the leakage area. This eliminates the need to scan and detect all sealing interfaces of the battery pack 14 under test, improving the airtightness detection efficiency of the battery pack 14. Furthermore, since the detection device 13 and the sensor module 11 are located at different stations, the detection device 13 can continuously perform airtightness detection on different battery packs 14 under test, improving the airtightness detection efficiency of batches of battery packs 14 and the utilization rate of the detection device 13. Simultaneously, when airtightness detection of batches of battery packs 14 is required, it is not necessary to equip a larger number of detection devices 13, thereby reducing the cost of the detection devices 13.

[0102] In one embodiment, as shown in FIG2, the air pumping pipeline includes a first pipeline and a second pipeline. The first pipeline is connected to the first vent 21 of the battery pack 14 under test, and the second pipeline is connected to the second vent 22 of the battery pack 14 under test.

[0103] The gas extraction and filling pipeline is used to extract gas from the battery pack 14 under test through the first vent 21 and to fill the battery pack 14 under test with the target gas through the second vent 22.

[0104] In this embodiment, a first pipeline is connected to the first vent 21 of the battery pack 14 under test, and a second pipeline is connected to the second vent 22 of the battery pack 14 under test, thereby realizing the gas injection and inflation operation of the battery pack 14 under test, thus laying the foundation for detecting whether there is a leakage area in the battery pack 14 under test.

[0105] In one embodiment, as shown in FIG2, the first pipeline includes a first gas source 23 and a first pressure regulating valve 24, the first pressure regulating valve 24 being disposed between the first gas source 23 and the first vent 21;

[0106] The second pipeline includes a second air source 25 and a second pressure regulating valve 26, which is located between the second air source 25 and the second vent 22.

[0107] The first gas source 23 can be a vacuum source. The first pressure regulating valve 24 is opened, connecting the first vent 21 to the first gas source 23, allowing gas inside the battery pack 14 under test to be extracted through the first vent 21 at a rated vacuum negative pressure. The second gas source 25 can be a source for charging the target gas. The second pressure regulating valve 26 is opened, connecting the second vent 22 to the second gas source 25, allowing the target gas to be charged into the battery pack 14 under test at a rated pressure.

[0108] The detection device provided in this application embodiment, by placing the first pressure regulating valve 24 between the first air source 23 and the first vent 21, and placing the second pressure regulating valve 26 between the second air source 25 and the second vent 22, realizes the gas injection and inflation operation of the battery pack 14 under test, laying the foundation for detecting whether there is a leakage area in the battery pack 14 under test.

[0109] In one embodiment, as shown in FIG2, the detection device further includes a heating device 27, which is disposed between the second pressure regulating valve 26 and the second gas source 25;

[0110] Heating device 27 is used to heat the target gas discharged from the second gas source 25;

[0111] The gas filling line is used to fill the battery pack 14 under test with the heated target gas through the second vent 22.

[0112] The heating device 27 can heat the target gas discharged from the second gas source 25, thereby increasing the temperature of the target gas. The higher temperature target gas is then injected into the battery pack 14 under test. In the event of a sealing defect in the battery pack 14 under test, the higher temperature target gas leaks into the external environment, and the leakage area of ​​the battery pack 14 under test can be detected by a thermal imaging detector.

[0113] The detection device provided in this application embodiment heats the target gas discharged from the second gas source 25 through the heating device 27, and the heating target gas is injected into the battery pack 14 under test through the pumping and charging pipeline from the second vent 22. In this way, when there is a sealing defect in the battery pack 14 under test, the target gas at a higher temperature leaks into the external environment, so that the leakage area of ​​the battery pack 14 under test can be detected by the thermal imaging detector.

[0114] In one embodiment, as shown in FIG2, the detection device further includes a barometric pressure detection device, the acquisition end of which extends into the internal space of the battery pack 14 to be tested.

[0115] The gas extraction pipeline is used to extract the gas in the battery pack 14 under test when the battery pack 14 is in the first working position until the pressure of the internal space of the battery pack 14 under test collected by the acquisition end reaches the first preset pressure.

[0116] The air pressure detection device is used to detect the pressure change of the internal space of the battery pack 14 under test within a first preset time period when the pressure of the internal space of the battery pack 14 under test reaches a first preset pressure, and to send the pressure change to the processing device 12.

[0117] The processing device 12 is used to control the gas pumping and charging pipeline to perform gas pumping and charging operations on the battery pack 14 under test according to the pressure change.

[0118] The air pressure detection device may include at least one of a first air pressure detection device 28, a second air pressure detection device 29, and a third air pressure detection device 30. The acquisition end of the air pressure detection device can extend into the internal space of the battery pack 14 under test through the first vent 21 or the second vent 22, or a vent can be opened at other locations of the battery under test, and the acquisition end of the air pressure detection device can extend into the internal space of the battery pack 14 under test through the vent opened at other locations of the battery under test, thereby detecting the pressure in the internal space of the battery pack 14 under test.

[0119] It should be noted that the first pipeline may include a first air pressure detection device 28, and the second pipeline may include a second air pressure detection device 29. The first air pressure detection device 28 is connected to the first pressure regulating valve 24, and the second air pressure detection device 29 is connected to the second pressure regulating valve 26.

[0120] When the battery pack 14 under test is in the first working position, the gas is extracted from the battery pack 14 under test through the gas extraction pipeline until the pressure of the internal space of the battery pack 14 under test collected by the acquisition end reaches the first preset pressure, so as to realize the negative pressure extraction operation of the battery pack 14 under test.

[0121] The processing device 12 can control the gas extraction / inflation pipeline to perform gas extraction / inflation operations on the battery pack 14 under test based on the pressure change. The processing device 12 can determine the pressure change rate of the internal space of the battery pack 14 under test within a first preset time period based on the pressure change. If the pressure change rate is less than the preset pressure change rate, it means that the battery pack 14 under test does not have a large leak. In this case, the next step can be performed, i.e., controlling the gas extraction / inflation pipeline to perform gas extraction / inflation operations on the battery pack 14 under test. If the pressure change rate is not less than the preset pressure change rate, it means that the battery pack 14 under test has a large leak, indicating a serious leakage defect. In this case, there is no need to proceed to the next step.

[0122] Before using the air pressure detection device 28 to detect the pressure change in the internal space of the battery pack 14 under test within a first preset time period, the gas in the battery pack 14 under test can be extracted through the air extraction and filling pipeline while the battery pack 14 is in the first working position until the pressure in the internal space of the battery pack 14 under test reaches the first preset pressure. After the pressure in the internal space of the battery pack 14 under test reaches the first preset pressure, the air pressure detection device 28 is used to detect the pressure change in the internal space of the battery pack 14 under test within the first preset time period. Based on the pressure change, it is determined whether there is a large leak in the battery pack 14 under test. If there is a large leak, it is not necessary to control the air extraction and filling pipeline to perform air extraction and filling operations on the battery pack 14 under test, and the battery pack 14 under test needs to be reworked. If there is no large leak, the air extraction and filling pipeline can be controlled to perform air extraction and filling operations on the battery pack 14 under test to replace the gas in the battery pack 14 under test, so that the target gas with a relatively uniform distribution is filled into the battery pack 14 under test. This allows the gas pumping and charging pipeline to be controlled to pump and charge the battery pack under test only when there is no major leakage in the battery pack under test 14, so as to further detect the leakage area of ​​the battery pack under test 14.

[0123] The detection device provided in this application determines whether there is a serious leakage defect in the battery pack 14 under test based on the pressure change in the internal space of the battery pack 14 under test. In this way, when there is no serious leakage defect in the battery pack 14 under test, the device controls the gas injection and inflation pipeline to perform gas injection and inflation operations on the battery pack 14 under test, thereby reducing the probability of performing gas injection and inflation operations on the battery pack 14 under test when there is a serious leakage defect.

[0124] In one embodiment, as shown in FIG2, the air pressure detection device 28 is used to detect the first pressure of the internal space when the battery pack 14 under test is subjected to an air pumping and inflation operation, and to send the first pressure to the processing device 12.

[0125] Processing device 12 is used to control the inflation speed and / or deflation speed according to the first pressure and the preset pressure range.

[0126] When the battery pack 14 under test is in the first working position, during the inflation / deflation operation of the battery pack 14 under test, the pressure detection device 28 can detect the first pressure in the internal space of the battery pack 14 under test and send the first pressure to the processing device 12. The processing device 12 is used to control the inflation speed and / or deflation speed according to the first pressure and a preset pressure range, so that the air pressure inside the battery pack 14 under test is controlled within the preset pressure range, such as 2.5 kPa to 3 kPa. For example, if the first pressure is higher than 3 kPa, the inflation speed can be reduced and / or the deflation speed can be increased; if the first pressure is lower than 2.5 kPa, the inflation speed can be increased and / or the deflation speed can be decreased, so that the air pressure inside the battery pack 14 under test is controlled within the preset pressure range.

[0127] The detection device provided in this application embodiment detects the first pressure of the internal space of the battery pack 14 under test during the inflation / deflation operation and sends the first pressure to the processing device 12. The processing device 12 controls the inflation speed and / or deflation speed according to the first pressure and a preset pressure range, thereby controlling the pressure of the internal space of the battery pack 14 under test within the preset pressure range. In the event of a sealing defect in the battery pack 14 under test, the target gas inside the battery pack 14 under test can leak into the external environment. The sensor module 11 then detects the target gas leaking from the battery pack 14 under test and generates an electrical signal, laying the foundation for detecting whether there is a leakage area in the battery pack 14 under test.

[0128] In one embodiment, as shown in FIG2, the processing device 12 is used to control the gas extraction and inflation pipeline to continue the gas extraction and inflation operation of the battery pack 14 under test during the process of controlling the transfer device to transfer the battery pack 14 under test from the first station to the second station.

[0129] During the transfer of the battery pack 14 under test from the first station to the second station, the gas extraction and filling pipeline continues to perform gas extraction and filling operations on the battery pack 14 under test, so as to make the target gas distribution within the battery pack 14 more uniform. Furthermore, since the gas extraction and filling operations are performed simultaneously with the transfer of the battery pack 14 under test, the total time required for the transfer and gas extraction / filling operations is reduced, thereby further improving the efficiency of the airtightness testing of the battery pack 14 under test.

[0130] The detection device provided in this application embodiment controls the gas extraction and filling pipeline to continue the gas extraction and filling operation of the battery pack 14 under test during the process of controlling the transfer equipment to transfer the battery pack 14 under test from the first station to the second station. This can make the target gas distribution in the battery pack 14 under test more uniform, reduce the total time required for the transfer and gas extraction and filling operation of the battery pack 14 under test, and thus further improve the airtightness detection efficiency of the battery pack 14 under test.

[0131] In one embodiment, the processing device 12 is configured to stop extracting gas from the battery pack 14 under test when the duration of the gas extraction and inflation operation of the gas extraction and inflation pipeline reaches a second preset duration, and to inject target gas into the battery pack 14 under test at a second preset pressure to perform constant pressure inflation on the battery pack 14 under test.

[0132] The first pressure regulating valve 24 in the first pipeline can be closed to stop the extraction of gas from the battery pack 14 under test, and the second pressure regulating valve 26 can be adjusted to the second preset pressure to charge the target gas into the battery pack 14 under test at the second preset pressure, so as to perform constant pressure charging of the battery pack 14 under test and balance the target gas in the battery pack 14 under test.

[0133] The detection device provided in this application embodiment stops extracting gas from the battery pack 14 under test when the duration of the gas extraction and inflation operation in the control gas extraction and inflation pipeline reaches a second preset duration, and then injects target gas into the battery pack 14 under test at a second preset pressure to perform constant pressure inflation on the battery pack 14 under test, thereby making the distribution of target gas in the battery pack 14 under test more uniform.

[0134] In one embodiment, as shown in FIG2, the processing device 12 is used to control the transfer device to transfer the battery pack 14 under test from the second station to the third station during the constant pressure inflation process of the battery pack 14 under test.

[0135] The processing device 12 is used to control the gas pumping pipeline to continue to pump the target gas into the battery pack 14 under test at a second preset pressure during the process of transferring the battery pack 14 under test to the third station.

[0136] The detection device provided in this application embodiment controls a transfer device to move the battery pack 14 from the second station to the third station during constant-pressure inflation. This allows for simultaneous constant-pressure inflation and transfer of the battery pack 14, saving the total time required for both inflation and transfer, thus improving the efficiency of airtightness testing. Furthermore, during the transfer of the battery pack 14 to the third station, the inflation pipeline continues to inject the target gas into the battery pack 14 at a second preset pressure, further ensuring a more uniform distribution of the target gas within the battery pack 14.

[0137] In one embodiment, the testing device 13 is located at the third station;

[0138] The processing device 12 is used to control the detection device 13 to perform detection along the leakage area when the constant pressure inflation time reaches the third preset time, so as to obtain the airtightness detection result of the leakage area.

[0139] When the constant pressure inflation time reaches the third preset time, it means that the distribution of the target gas in the battery pack 14 under test is sufficiently uniform. In this case, the detection device 13 can be controlled to perform detection along the leakage area to obtain the airtightness detection result of the leakage area.

[0140] The detection device 13 may include a probe and a detector. The probe can draw in the target gas leaking from the leak area and transmit the drawn-in target gas to the detector. The detector determines the leakage rate of the target gas based on the target gas transmitted by the probe. If the leakage rate is greater than a preset leakage rate, it means that the airtightness test result is a failure; if the leakage rate is not greater than the preset leakage rate, it means that the airtightness test result is a pass. A robotic arm can be used to carry the probe along the leak area to scan and detect the target gas leaking from the leak area.

[0141] The detection device provided in this application embodiment uses a detection device 13 located at the third station to detect along the leakage area to obtain the airtightness detection result of the leakage area. This eliminates the need to scan and detect all sealing interfaces of the battery pack 14 under test, improving the airtightness detection efficiency of the battery pack 14. Furthermore, since the detection device 13 and the sensor module 11 are located at different stations, the detection device 13 can continuously perform airtightness detection on different battery packs 14 under test, improving the airtightness detection efficiency of batches of battery packs 14 and the utilization rate of the detection device 13. Simultaneously, when airtightness detection of batches of battery packs 14 is required, it is not necessary to equip a larger number of detection devices 13, thereby reducing the cost of the detection devices 13.

[0142] In one embodiment, as shown in FIG2, the detection device further includes a leak detection pipeline, which includes a chamber 31 and a differential pressure sensor 32. The first end of the differential pressure sensor 32 is connected to the second pressure regulating valve 26 and the second vent 22, and the first end of the chamber 31 is connected to the second end of the differential pressure sensor and the second vent 22.

[0143] A differential pressure sensor is used to detect the pressure difference between the battery pack 14 under test and the chamber 31, and to send the pressure difference to the processing device 12.

[0144] Processing device 12 is used to determine the airtightness test result of the battery pack 14 under test based on the pressure difference.

[0145] The detection device provided in this application embodiment allows the processing device 12 to determine the rate of change of the pressure difference based on the pressure difference. If the rate of change of the pressure difference is less than a preset rate of change, the airtightness test result of the battery pack 14 under test is determined to be a pass; if the rate of change of the pressure difference is not less than the preset rate of change, the airtightness test result of the battery pack 14 under test is determined to be a fail. By detecting the pressure difference between the battery pack 14 under test and the chamber, the entire battery pack 14 under test can be leak-tested, that is, the airtightness of the entire battery pack 14 under test can be detected. This allows for the detection of other areas that the detection device 13 cannot cover. Other areas refer to the sealing interface other than the aforementioned leakage area, thus improving the comprehensiveness of the airtightness test of the sealing interface of the battery pack 14 under test.

[0146] In one embodiment, the leak detection pipeline further includes a third pressure regulating valve 33, with the first end of the differential pressure sensor connected to the first end of the third pressure regulating valve 33, and the second end of the chamber 31 connected to the second end of the third pressure regulating valve 33.

[0147] A differential pressure sensor is used to detect the pressure difference when the second pressure regulating valve 26 and the third pressure regulating valve 33 are closed, and to send the pressure difference to the processing device 12.

[0148] It should be noted that when the detection device includes a leak detection pipeline, and the battery pack 14 under test is being pumped or inflated, the third pressure regulating valve needs to be opened to maintain communication between the chamber and the battery pack 14 under test. Furthermore, after the constant pressure inflation time reaches the third preset time, the third pressure regulating valve needs to be closed, and the detection device 13 should be controlled to perform detection along the leak area to obtain the airtightness test result of the leak area.

[0149] In this embodiment, when the second pressure regulating valve 26 and the third pressure regulating valve are closed, the differential pressure sensor detects the pressure difference and sends the pressure difference to the processing device 12, thereby realizing the airtightness detection of the sealing interface on the battery pack 14 under test, excluding the leakage area.

[0150] The detection device provided in this application embodiment detects the pressure difference when the second pressure regulating valve 26 and the third pressure regulating valve are closed, and sends the pressure difference to the processing device 12, thereby realizing the airtightness detection of the sealing interface that the detection device 13 cannot cover, and improving the comprehensiveness of the airtightness detection of the sealing interface of the battery pack 14 under test.

[0151] Referring to Figure 3, which is a flowchart illustrating the battery pack airtightness testing method provided in an embodiment of this application, the method includes:

[0152] S301, the sensor module detects the battery pack under test to obtain electrical signals and sends the electrical signals to the processing equipment.

[0153] S302, the processing device receives the electrical signals sent by the sensor module.

[0154] S303, the processing equipment determines the leakage area of ​​the battery pack under test based on the electrical signal, and controls the detection equipment to perform detection along the leakage area.

[0155] S304, when the detection equipment is used to detect along the leak area, the airtightness test result of the leak area is obtained.

[0156] The detection method provided in this application first determines the leakage area of ​​the battery pack under test, and then detects the leakage area. It does not require detection of the entire sealing interface of the battery pack under test, thereby saving detection time and improving the detection efficiency of airtightness detection.

[0157] In one embodiment, the method further includes:

[0158] When the battery pack under test is in the first station, the processing equipment controls the gas extraction and filling pipeline to perform gas extraction and filling operations on the battery pack under test. The gas extraction and filling operations include extracting gas from the battery pack under test and filling the battery pack under test with the target gas. The gas extraction speed is less than the gas filling speed. When the battery pack under test is transferred from the first station to the second station, the sensor module detects the battery pack under test and obtains electrical signals.

[0159] In one embodiment, the step S302 above, "controlling the detection device to perform detection along the leak area to obtain the airtightness detection result of the leak area," can be achieved in the following way:

[0160] The processing equipment controls the detection equipment located at the third station to perform detection along the leak area in order to obtain the airtightness test results of the leak area.

[0161] In one embodiment, the aforementioned "processing equipment controlling the gas extraction and filling pipeline to perform gas extraction and filling operations on the battery pack under test" can be achieved in the following way:

[0162] When the pressure inside the battery pack under test reaches a first preset pressure, the air pressure detection device detects the pressure change in the internal space of the battery pack under test within a first preset time period and sends the pressure change to the processing device; the processing device controls the air pumping and filling pipeline to perform air pumping and filling operations on the battery pack under test according to the pressure change; wherein, the pressure change is detected when the pressure inside the battery pack under test reaches the first preset pressure.

[0163] In one embodiment, the method further includes:

[0164] The processing equipment controls the inflation and / or deflation speed of the battery pack under test based on the first pressure and preset pressure range of the internal space of the battery pack under test detected by the air pressure detection equipment; the first pressure is detected when the battery pack under test is being deflated and inflated.

[0165] In one embodiment, the method further includes:

[0166] During the process of transferring the battery pack under test from the first station to the second station, the gas pumping and charging pipeline is controlled to continue the gas pumping and charging operation of the battery pack under test.

[0167] In one embodiment, the method further includes:

[0168] When the duration of the gas extraction and inflation operation of the gas extraction and inflation pipeline reaches the second preset duration, the processing equipment controls the gas extraction and inflation pipeline to stop extracting gas from the battery pack under test, and controls the gas extraction and inflation pipeline to inject the target gas into the battery pack under test at the second preset pressure, so as to perform constant pressure inflation of the battery pack under test.

[0169] In one embodiment, the method further includes:

[0170] During the constant pressure inflation process of the battery pack under test, the processing equipment controls the transfer equipment to transfer the battery pack under test to the third station; while the battery pack under test is transferred to the third station, the processing equipment controls the gas pumping pipeline to continue to inject the target gas into the battery pack under test at the second preset pressure.

[0171] In one embodiment, the method further includes:

[0172] When the constant pressure inflation time reaches the third preset time, the processing equipment controls the detection equipment to perform detection along the leakage area to obtain the airtightness test results of the leakage area.

[0173] In one embodiment, the method further includes:

[0174] The processing equipment receives the pressure difference between the battery pack under test and the chamber included in the leak detection pipeline, which is sent by the leak detection pipeline; the processing equipment determines the airtightness test result of the battery pack under test based on the pressure difference.

[0175] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0176] Based on the same inventive concept, this application also provides a battery pack airtightness testing device for implementing the above-mentioned device. The solution provided by this device is similar to the solution described in the above-described method; therefore, the specific limitations in one or more testing device embodiments provided below can be found in the limitations of the testing method described above, and will not be repeated here.

[0177] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0178] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0179] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A battery pack airtightness testing device, wherein, The detection device includes a sensor module, a processing device, and a detection device; The sensor module is used to detect the battery pack under test to obtain electrical signals and send the electrical signals to the processing device. The processing device is used to determine the leakage area of ​​the battery pack under test based on the electrical signal, and control the detection device to perform detection along the leakage area to obtain the airtightness detection result of the leakage area.

2. The detection device according to claim 1, wherein, The testing device also includes an air pumping and filling pipeline, which is connected to the battery pack under test. The processing device is used to control the gas extraction and filling pipeline to perform gas extraction and filling operations on the battery pack under test when the battery pack under test is in the first working position; the gas extraction and filling operation includes extracting gas from the battery pack under test and filling the battery pack under test with target gas, and the gas extraction speed is less than the gas filling speed. The sensor module is used to detect the battery pack under test and obtain electrical signals when the battery pack under test is transferred from the first station to the second station.

3. The detection device according to claim 2, wherein, The testing equipment is located at the third workstation; The processing equipment is used to control the detection equipment set at the third station to perform detection along the leakage area in order to obtain the airtightness detection result of the leakage area.

4. The detection device according to claim 2 or 3, wherein, The air pumping and filling pipeline includes a first pipeline and a second pipeline. The first pipeline is connected to the first vent of the battery pack under test, and the second pipeline is connected to the second vent of the battery pack under test. The gas extraction and filling pipeline is used to extract gas from the battery pack under test through the first vent and to fill the battery pack under test with the target gas through the second vent.

5. The detection device according to claim 4, wherein, The first pipeline includes a first gas source and a first pressure regulating valve, wherein the first pressure regulating valve is disposed between the first gas source and the first vent. The second pipeline includes a second air source and a second pressure regulating valve, with the second pressure regulating valve disposed between the second air source and the second vent.

6. The detection device according to claim 5, wherein, The detection device further includes a heating device, which is disposed between the second pressure regulating valve and the second gas source; The heating device is used to heat the target gas discharged from the second gas source. The gas filling pipeline is used to fill the battery pack under test with the heated target gas through the second vent.

7. The detection device according to any one of claims 2-6, wherein, The detection device also includes a bar pressure detection device, the acquisition end of which extends into the internal space of the battery pack under test. The gas extraction and inflation pipeline is used to extract the gas from the battery pack under test when the battery pack under test is in the first working position, until the pressure of the internal space of the battery pack under test collected by the acquisition end reaches the first preset pressure. The air pressure detection device is used to detect the pressure change in the internal space of the battery pack under test within a first preset time period when the pressure in the internal space of the battery pack under test reaches a first preset pressure, and to send the pressure change to the processing device. The processing equipment is used to control the gas pumping and filling pipeline to perform gas pumping and filling operations on the battery pack under test according to the pressure change.

8. The detection device according to claim 7, wherein, The air pressure detection device is used to detect the first pressure of the internal space when the battery pack under test is being pumped or filled with air, and to send the first pressure to the processing device. The processing device is used to control the inflation speed and / or the deflation speed according to the first pressure and the preset pressure range.

9. The detection device according to any one of claims 2-8, wherein, The processing equipment is used to control the gas pumping and filling pipeline to continue the gas pumping and filling operation on the battery pack under test during the process of transferring the battery pack under test from the first station to the second station.

10. The detection device according to claim 9, wherein, The processing device is configured to stop extracting gas from the battery pack under test when the duration of the gas extraction and inflation operation of the gas extraction and inflation pipeline reaches a second preset duration, and to inject the target gas into the battery pack under test at a second preset pressure to perform constant pressure inflation on the battery pack under test.

11. The detection device according to claim 10, wherein, The processing equipment is used to control the transfer equipment to transfer the battery pack under test from the second station to the third station during the constant pressure inflation process of the battery pack under test. The processing equipment is used to control the gas pumping pipeline to continue to pump the target gas into the battery pack under test at the second preset pressure during the process of transferring the battery pack under test to the third station.

12. The detection device according to claim 10, wherein, The processing device is used to control the detection device to perform detection along the leakage area when the constant pressure inflation time reaches a third preset time, so as to obtain the airtightness detection result of the leakage area.

13. The detection apparatus according to any one of claims 5-12, wherein, The detection device also includes a missed detection pipeline, which includes a chamber connected to the battery pack under test. The leak detection pipeline is used to detect the pressure difference between the battery pack under test and the chamber, and to send the pressure difference to the processing device; The processing equipment is used to determine the airtightness test result of the battery pack under test based on the pressure difference.

14. The detection device according to claim 13, wherein, The leak detection pipeline also includes a third pressure regulating valve, with the first end of the differential pressure sensor connected to the first end of the third pressure regulating valve, and the second end of the chamber connected to the second end of the third pressure regulating valve; The differential pressure sensor is used to detect the pressure difference when the second pressure regulating valve and the third pressure regulating valve are closed, and to send the pressure difference to the processing device.

15. A method for testing the airtightness of a battery pack, wherein, The method includes: The sensor module detects the battery pack under test to obtain electrical signals and sends the electrical signals to the processing device; The processing device receives the electrical signals sent by the sensor module; The processing device determines the leakage area of ​​the battery pack under test based on the electrical signal, and controls the detection device to perform detection along the leakage area; When the detection equipment performs detection along the leak area, the airtightness detection result of the leak area is obtained.

16. The method according to claim 15, wherein, The method further includes: When the battery pack under test is in the first working position, the processing equipment controls the gas extraction and filling pipeline to perform gas extraction and filling operations on the battery pack under test; wherein, the gas extraction and filling operation includes extracting gas from the battery pack under test and filling the battery pack under test with target gas, and the gas extraction speed is less than the gas filling speed. When the battery pack under test is transferred from the first station to the second station, the sensor module detects the battery pack under test to obtain the electrical signal.

17. The method according to claim 16, wherein, The control of the detection device to perform detection along the leak area includes: The processing equipment controls the detection equipment located at the third station to perform detection along the leak area.

18. The method according to claim 16 or 17, wherein, The processing equipment controls the gas pumping and filling pipeline to perform gas pumping and filling operations on the battery pack under test, including: When the pressure inside the battery pack under test reaches a first preset pressure, the air pressure detection device detects the pressure change in the internal space of the battery pack under test within a first preset time period and sends the pressure change to the processing device. The processing equipment controls the pumping and charging pipeline to pump and charge the battery pack under test according to the pressure change. Pneumatic operation.

19. The method according to claim 18, wherein, The method further includes: The processing device controls the inflation speed and / or deflation speed of the battery pack under test based on the first pressure and preset pressure range of the internal space of the battery pack under test detected by the air pressure detection device; the first pressure is detected when the battery pack under test is being deflated and inflated.

20. The method of claim 17, wherein, The method further includes: During the process of transferring the battery pack under test from the first station to the second station, the processing equipment controls the gas pumping and filling pipeline to continue to pump and fill the battery pack under test.

21. The method according to claim 20, wherein, The method further includes: If the duration of the gas extraction and inflation operation of the gas extraction and inflation pipeline on the battery pack under test reaches the second preset duration, the processing device controls the gas extraction and inflation pipeline to stop extracting gas from the battery pack under test, and controls the gas extraction and inflation pipeline to inject the target gas into the battery pack under test at the second preset pressure, so as to perform constant pressure inflation on the battery pack under test.

22. The method according to claim 21, wherein, The method further includes: During the constant pressure inflation process of the battery pack under test, the processing equipment controls the transfer equipment to transfer the battery pack under test to the third station. When the battery pack under test is transferred to the third station, the processing equipment controls the gas pumping pipeline to continue to pump the target gas into the battery pack under test at the second preset pressure.

23. The method according to claim 22, wherein, The control of the detection device to perform detection along the leak area includes: When the constant pressure inflation time reaches the third preset time, the processing device controls the detection device to perform detection along the leakage area.

24. The method according to any one of claims 15-23, wherein, The method further includes: The processing device receives the pressure difference between the battery pack under test and the chamber included in the leak detection pipeline, transmitted by the leak detection pipeline; The processing equipment determines the airtightness test result of the battery pack under test based on the pressure difference.

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