Battery airtightness detection device

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By designing a battery airtightness detection device including a test chamber, an air supply device, a vacuum pump, a suction device and a detection instrument, the problem of poor accuracy of battery airtightness detection in the prior art is solved, and a fast, accurate and safe detection effect is achieved.

CN222618138UActive Publication Date: 2025-03-14HUAIAN JUNSHENG NEW ENERGY TECHNOLOGY CO LTD

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Patent Information

Application Number: CN202421443658.5
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-06-21
Publication Date: 2025-03-14
Estimated Expiration: 2034-06-21

AI Technical Summary

Technical Problem

In the prior art, the accuracy of battery airtightness detection is poor, the detection process is cumbersome, the cost is high, the efficiency is low, and the accuracy is poor.

Method used

A battery airtightness detection device is designed, including a test chamber, an air supply device, a vacuum pump, a suction device and a detection instrument. The test chamber is vacuumed by a vacuum pump, and then gas is introduced into the cavity through the air supply device. The suction device sucks the gas in the cavity into the detection instrument for detection.

Benefits of technology

It realizes the rapid and accurate detection of poor airtight batteries, reducing safety problems caused by poor airtight batteries, and the device is simple in structure, convenient in operation, low cost and low misjudgment rate.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a battery air tightness detection device, which comprises a test device, an air supply device, a vacuum pump, an air suction device and a detection instrument, the test device is provided with a test cavity for accommodating a battery to be detected, and the air supply device is communicated with the test cavity through an air supply pipeline so as to introduce air into the test cavity during air tightness detection. The vacuum pump is communicated with the test cavity through a vacuumizing pipeline and vacuumizes the test cavity before gas is introduced into the test cavity, the gas suction device is communicated with the test cavity through a gas suction pipeline and sucks gas from the test cavity after gas is introduced into the test cavity, and the detection instrument is communicated with the gas suction device and receives the gas sucked by the gas suction device. According to the utility model, the problem of poor detection accuracy of the air tightness of the battery in the prior art is solved.

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Description

Technical Field

[0001] The utility model relates to the technical field of battery detection, in particular to a battery air tightness detection device. Background Art

[0002] For soft-pack lithium-ion batteries, airtightness testing has become a very important part of the production process. During the production process of soft-pack lithium batteries, from the injection of battery cells to the shipment of battery cells, the battery cells need to be strictly tested for airtightness at regular intervals. Battery cells with poor airtightness can easily cause quality and safety problems, such as battery cell leakage, swelling, and corrosion of electronic components in the module. The currently used airtightness testing methods are not reasonable, the testing process is cumbersome, the testing cost is high, the testing efficiency is low, and the testing accuracy is poor. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery air tightness detection device to solve the problem of poor accuracy of battery air tightness detection in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a battery air tightness detection device, including: a testing device, an air supply device, a vacuum pump, an air suction device, and a detection instrument. The testing device has a test cavity for accommodating a battery to be tested. The air supply device is connected to the test cavity through an air supply pipeline so as to introduce gas into the test cavity during air tightness detection. The vacuum pump is connected to the test cavity through a vacuum pumping pipeline, and evacuates the test cavity before introducing gas into the test cavity. The air suction device is connected to the test cavity through an air suction pipeline, and sucks air from the test cavity after introducing gas into the test cavity. The detection instrument is connected to the air suction device and receives the gas sucked by the air suction device.

[0005] Furthermore, the battery air tightness detection device also includes a valve, and a valve is provided on at least one of the gas supply pipeline, the vacuum pipeline, and the air suction pipeline.

[0006] Furthermore, the battery air tightness detection device also includes a filter, and the filter is provided on at least one of the air supply pipeline, the vacuum pipeline, and the air intake pipeline.

[0007] Furthermore, the battery air tightness detection device also includes a containing device, which is arranged in the test cavity, and the battery to be tested is placed on the containing device.

[0008] Furthermore, the battery air tightness detection device also includes a support member, which is disposed in the test cavity and abuts against an inner wall of the test cavity.

[0009] Furthermore, the support member has through holes for gas circulation, the through holes penetrate both sides of the support member, there are one or more through holes, and when there are more than one through holes, at least some of the through holes are arranged along the surface of the support member.

[0010] Furthermore, the battery air tightness detection device also includes a base body, which includes an installation area and a detection area. The vacuum pump, the suction device, and the detection instrument are located in the installation area, and the test device is located in the detection area.

[0011] Furthermore, the installation area includes a first installation area and a second installation area. The first installation area, the detection area and the second installation area are arranged in sequence from bottom to top. The detection instrument is located in the first installation area, and the vacuum pump and the suction device are located in the second installation area.

[0012] Furthermore, the testing device has an air inlet, an air outlet and a retest port for retesting, an air supply pipeline is connected to the air inlet, and an air suction pipeline is connected to the air outlet.

[0013] Furthermore, the battery air tightness detection device also includes a pressure sensor and a controller. The pressure sensor is connected to the test device and detects the pressure in the test cavity. The controller is electrically connected to the pressure sensor and the vacuum pump and receives the pressure change signal of the pressure sensor and controls the working state of the vacuum pump.

[0014] By applying the technical solution of the utility model, the battery is placed in a test cavity, and the gas in the test cavity is detected to judge the air tightness of the battery. The battery with poor air tightness can be detected quickly and accurately, and the detection device has a simple structure and is easy to operate. Specifically, the battery to be tested is placed in a vacuum test cavity, and the vacuum pump is started to evacuate the test cavity. The vacuum pump is connected to the test cavity through a vacuum pipeline to ensure that the vacuum degree of the test cavity meets the requirements. After the vacuum degree meets the requirements, the battery air tightness detection device enters the pressure holding stage. After the pressure holding stage is over, the gas supply device introduces gas into the test cavity through the gas supply pipeline. At the same time, the suction device sucks gas from the test cavity through the suction pipeline and sends it to the detection instrument for gas detection to judge the air tightness of the battery. In this way, the battery with poor air tightness can be effectively and accurately judged by detecting the gas, thereby reducing the probability of safety problems caused by poor battery air tightness. Compared with the traditional detection method, the above-mentioned device of this embodiment uses a vacuum pump to evacuate the test chamber in advance before the detection, thereby avoiding the influence of the original environment in the test chamber on the detection result. Subsequently, gas is supplied to the test chamber through the gas supply device, so that the leaked components can be mixed in the newly introduced gas. The suction device is used to allow the gas mixed with the leaked components to enter the detection instrument for detection, thereby realizing the battery air tightness detection, which can not only ensure the accuracy of the detection, but also simplify the complexity of the device and operation, so as to effectively, accurately and quickly detect lithium-ion batteries with poor air tightness. Moreover, the air tightness detection device of this embodiment has a low investment cost, a scientific and reliable test principle, and a low misjudgment rate. It can be used for random inspection and full inspection of air tightness in the production process of lithium-ion batteries, and can also be used for air tightness detection of lithium-ion batteries before shipment, thereby reducing the probability of safety problems caused by poor air tightness of lithium-ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 The structure diagram of the battery air tightness detection device of the utility model is shown;

[0017] Figure 2 A schematic diagram of a pipeline of a battery air tightness detection device is shown;

[0018] Figure 3 A schematic structural diagram of the cover plate is shown.

[0019] The above drawings include the following reference numerals:

[0020] 10. Test device; 11. Air inlet; 12. Air outlet; 13. Re-test port; 14. Test chamber; 20. Air supply device; 30. Vacuum pump; 40. Air suction device; 50. Testing instrument; 60. Holding device; 70. Pressure sensor; 80. Controller; 90. Support member; 100. Filter; 110. Valve. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0023] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0024] In order to solve the problem of poor accuracy in battery air tightness detection in the prior art, the utility model provides a battery air tightness detection device.

[0025] like Figure 1 and Figure 2 A battery air tightness detection device shown includes: a test device 10, an air supply device 20, a vacuum pump 30, an air suction device 40, and a detection instrument 50. The test device 10 has a test cavity 14 for accommodating a battery to be tested. The air supply device 20 is connected to the test cavity 14 through an air supply pipeline so as to introduce gas into the test cavity 14 during air tightness detection. The vacuum pump 30 is connected to the test cavity 14 through a vacuum extraction pipeline and evacuates the test cavity 14 before introducing gas into the test cavity 14. The air suction device 40 is connected to the test cavity 14 through an air suction pipeline and inhales air from the test cavity 14 after introducing gas into the test cavity 14. The detection instrument 50 is connected to the air suction device 40 and receives the gas sucked by the air suction device 40.

[0026] This embodiment places the battery in the test cavity 14 and detects the gas in the test cavity 14 to judge the air tightness of the battery. It can quickly and accurately detect batteries with poor air tightness, and the detection device has a simple structure and is easy to operate. Specifically, the battery to be tested is placed in the vacuum test cavity 14, and the vacuum pump 30 is started to evacuate the test cavity 14. The vacuum pump 30 is connected to the test cavity 14 through a vacuum pipeline to ensure that the vacuum degree of the test cavity 14 meets the requirements. After the vacuum degree meets the requirements, the battery air tightness detection device enters the pressure holding stage. After the pressure holding stage is over, the gas supply device 20 introduces gas into the test cavity 14 through the gas supply pipeline, and at the same time, the suction device 40 sucks gas from the test cavity 14 through the suction pipeline and sends it to the detection instrument 50 for gas detection to judge the air tightness of the battery. In this way, the battery with poor air tightness can be effectively and accurately judged by detecting the gas, thereby reducing the probability of safety problems caused by poor battery air tightness. Compared with the traditional detection method, the above-mentioned device of the present embodiment evacuates the test cavity 14 into a vacuum in advance through the vacuum pump 30 before the detection, thereby avoiding the influence of the original environment in the test cavity 14 on the detection result, and then supplies gas to the test cavity 14 through the gas supply device 20, so that the leaked components can be mixed in the newly introduced gas, and cooperate with the suction device 40 to allow the gas mixed with the leaked components to enter the detection instrument 50 for detection, thereby realizing the battery air tightness detection, which can not only ensure the accuracy of the detection, but also simplify the complexity of the device and operation, so as to effectively, accurately and quickly detect lithium-ion batteries with poor air tightness. Moreover, the air tightness detection device of the present embodiment has a low investment cost, a scientific and reliable test principle, and a low misjudgment rate. It can be used for random inspection and full inspection of air tightness in the production process of lithium-ion batteries, and can also be used for air tightness detection of lithium-ion batteries before shipment, thereby reducing the probability of safety problems caused by poor air tightness of lithium-ion batteries.

[0027] The battery air tightness detection device in this embodiment further includes a valve 110, which can be arranged on one or two of the air supply pipeline, the vacuum pipeline, and the air suction pipeline, or can also be arranged on the other side of the air supply pipeline. Figure 2As shown in , valves 110 are arranged on the gas supply pipeline, the vacuum pipeline, and the air suction pipeline. In order to facilitate control, valves 110 are arranged on the gas supply pipeline, the vacuum pipeline, and the air suction pipeline in this embodiment. The three valves 110 can timely control the opening and closing of the corresponding pipelines. Specifically, when the test chamber 14 is vacuumed, the valves 110 arranged on the gas supply pipeline and the air suction pipeline are closed, and the valve 110 arranged on the vacuum pipeline is opened, so that the vacuum pump 30 can vacuum the test chamber 14. After the vacuum degree reaches the requirement, the vacuum pump 30 can be opened in time. The valve 110 arranged on the vacuum pipeline is closed, so that the test cavity 14 becomes a closed chamber, and the test cavity 14 is pressurized. After the pressure maintaining stage is over, the valves 110 arranged on the gas supply pipeline and the air suction pipeline are opened, so that the gas supply pipeline can deliver gas into the test cavity 14, and the air suction pipeline can deliver gas into the detection instrument 50 for gas detection. In this way, the opening and closing of the valve 110 realizes the sealing and circulation of the gas in the test cavity 14, thereby realizing the control of the test stage and improving the accuracy of the airtightness detection.

[0028] The battery air tightness detection device in this embodiment further includes a filter 100. The filter 100 is provided on at least one of the gas supply pipeline, the vacuum pipeline, and the air suction pipeline. The filter 100 is used to filter the gas in the system. Figure 2 As shown, in this embodiment, it is preferred that a filter 100 is only provided on the gas supply pipeline, so that the gas filled into the test cavity 14 can be filtered to ensure that the gas entering the test cavity 14 meets the requirements. Since the requirements for gas purity are not high for the vacuum pipeline and the suction pipeline, it is not necessary to provide a filter 100. In particular, since the suction pipeline needs to transport the gas with the leaking component to the detection instrument 50, it is preferred that the filter 100 is not provided on the suction pipeline, or even if the filter 100 is provided, it is necessary to ensure that the filter 100 does not filter out the leaking component to ensure the accuracy of the detection.

[0029] The battery air tightness detection device in this embodiment also includes a holding device 60. The holding device 60 can be a tray or other components. The holding device 60 is arranged in the test cavity 14. The battery to be tested is placed on the holding device 60. The size of the holding device 60 is as large as possible so that multiple batteries to be tested can be placed. In this way, multiple batteries can be tested at one time, thereby improving the efficiency of the detection.

[0030] The battery air tightness detection device in this embodiment further includes a support member 90, which is disposed in the test cavity 14 and above the containing device 60, and the support member 90 abuts against the inner wall of the test cavity 14. Considering that the interior of the test cavity 14 is under negative pressure in most cases, in order to ensure the shape stability of the test cavity 14, the present embodiment additionally provides a support member 90, which can support the side wall of the test cavity 14, and prevent the side wall of the cavity from being deformed due to the influence of air pressure, thereby avoiding adverse effects on the internal battery and ensuring the reusability of the device.

[0031] Since the test device 10 of the present embodiment is opened up and down, the support member 90 is arranged horizontally in the test device 10. Of course, the specific arrangement of the support member 90 can be adjusted according to the test device 10. In addition, the support member 90 of the present embodiment is a plate-shaped member, and the support member 90 has a through hole for gas circulation. The through hole runs through both sides of the support member 90, so that the support member 90 can ensure the circulation of gas in the test cavity 14 while providing support for the test cavity 14, thereby ensuring the test effect. The number of through holes can be set as needed, and can be set to one or more. When only one through hole is set, the through hole can be set larger to ensure the smooth passage of airflow, but this method may affect the structural strength of the support member 90. Therefore, in the present embodiment, it is preferred that there are multiple through holes, and the through holes are arranged along the surface of the support member 90, and the through holes are not connected to each other, such as Figure 3 As shown, in this way, the through hole can ensure the circulation of airflow and reduce the impact on the structural strength of the support member 90. Of course, the specific shape of the support member 90 and the specific arrangement of the through holes thereon can be adjusted as needed.

[0032] The battery air tightness detection device in this embodiment also includes a substrate, which is the main structure of the battery air tightness detection device and plays the role of installing and accommodating various components. The substrate in this embodiment includes an installation area and a detection area, wherein the vacuum pump 30, the suction device 40, and the detection instrument 50 are located in the installation area. The components in the installation area basically do not need to be disassembled after one installation, so most of the installation area is shielded, and only some observation windows are reserved for observing the operating status of the equipment and for the corresponding operation buttons to protrude. The test device 10 is located in the detection area, which is the main area for detection. When using, the battery to be tested will be frequently put in and taken out. When setting, the detection area can be set to be transparent and observable as a whole, so as to facilitate the observation of the detection situation. At the same time, the installation area and the detection area are set separately, so that the test area avoids the installation area, so that the frequent operation of the test device 10 does not affect the installation area, and the battery air tightness detection device is simple to operate and easy to install and disassemble.

[0033] The installation area in this embodiment includes a first installation area and a second installation area. The base body of this embodiment is a vertical structure as a whole, so the first installation area, the detection area and the second installation area are arranged in sequence from bottom to top, wherein the detection instrument 50 is located in the first installation area, the vacuum pump 30 and the suction device 40 are located in the second installation area, and the test device 10 is located in the middle detection area. Specifically, Figure 1 As shown, the detection instrument 50 is located above the test device 10, and the vacuum pump 30 and the suction device 40 are located below the test device 10, so that the vacuum pump 30 and the suction device 40 in the second installation area are connected to the test cavity 14 through pipelines, and the detection instrument 50 in the first installation area is connected to the suction device 40 through pipelines, so that the first installation area, the detection area and the second installation area together form a complete system, and the battery airtightness test can be completed by only placing the battery in the detection area without destroying the structure of the battery, thereby ensuring the integrity of the battery.

[0034] It should be noted that the specific arrangement of the base is not limited to the above-mentioned arrangement of this embodiment, and it can be adjusted accordingly as needed, as long as the internal pipeline arrangement is the same as that of this embodiment.

[0035] In addition to the test chamber 14, the test device 10 in this embodiment also has an air inlet 11, an air outlet 12 and a re-testing port 13 for re-testing. The air inlet 11 is located on the right side wall of the test chamber 14, and the air supply pipeline is connected to the air inlet 11, so that the air supply pipeline delivers gas to the test chamber 14 through the air inlet 11. The air outlet 12 is located on the left side wall of the test chamber 14 and is arranged opposite to the air inlet 11. The air suction pipeline is connected to the air outlet 12, so that the gas in the test chamber 14 is delivered to the air suction device 40 through the air outlet 12, and at the same time, it is ensured that the gas entering from the air inlet 11 passes through the test chamber 14 and is fully mixed with the gas in the test chamber before being output from the air outlet 12, thereby improving the accuracy of the test result. The re-testing port 13 is located above the test chamber 14 and can be connected to other detection equipment, so that the gas in the test chamber 14 can be re-tested. The re-testing port 13 and the air inlet 11 are arranged in different directions, which can also improve the accuracy of the re-testing result. To reduce the misjudgment rate, of course, the air inlet 11, the air outlet 12 and the retest port 13 can also be set at other positions of the test chamber, ensuring that the air outlet 12 and the retest port 13 are at a certain distance from the air inlet 11 so that the gas in the test chamber 14 can be fully circulated. Since the present embodiment is also provided with a vacuum pumping pipeline, the vacuum pumping pipeline can share an air port with other pipelines, or an additional air port can be separately provided for cooperation with the vacuum pumping pipeline. Due to the setting of the valve 110, the operations of the pipelines will not affect each other.

[0036] The battery air tightness detection device in this embodiment also includes a pressure sensor 70 and a controller 80. The pressure sensor 70 is connected to the test device 10 and detects the pressure in the test cavity 14. The controller 80 is electrically connected to the pressure sensor 70 and the vacuum pump 30, and receives the pressure change signal of the pressure sensor 70 and controls the working state of the vacuum pump 30. In this way, the pressure sensor 70 can promptly reflect whether the vacuum degree in the test cavity 14 meets the requirements, and the controller 80 can promptly shut down the vacuum pump 30 after the vacuum degree meets the requirements, so as to ensure the safety of the test chamber.

[0037] In addition to the above components, the battery air tightness detection device can also be provided with indicator lights, switches, operating screens and other components as needed to indicate, detect, and control the detection situation, thereby ensuring the controllability of the detection situation. The detection instrument 50 of this embodiment preferably adopts a VOC tester with a detection accuracy of ppb level, thereby ensuring the detection accuracy.

[0038] The specific detection process of the battery air tightness detection device of this embodiment is as follows:

[0039] Set the detection process parameters and organic gas content control standards on the operation screen. The organic gas content control standard is ≤200ppb;

[0040] Click the "Return to Zero" button on the operation screen to return each mechanical part of the detection device to the origin;

[0041] like Figure 2 As shown, one or more batteries to be tested are placed in the holding device 60 in the test cavity 14, a support member 90 is placed above the holding device 60, and the vacuum pump 30 is started to evacuate the vacuum cavity. The vacuum pump 30 is connected to the test cavity 14 through a vacuum pipeline to ensure that the vacuum degree in the vacuum cavity meets the standard. In this embodiment, the preferred vacuum degree is -80kPa to -90kPa. The pressure change monitored by the pressure sensor 70 is recorded, and the pressure change data is input into the controller 80. The controller 80 determines the airtightness of the vacuum cavity according to the preset pressure change curve.

[0042] When the vacuum degree in the vacuum chamber reaches the set standard, the testing equipment automatically enters the pressure holding stage, and the pressure holding time can be set to 2 to 3 minutes;

[0043] After the pressure holding stage is over, the air inlet 11 and the air outlet 12 are opened simultaneously, and fresh, dry compressed air is injected into the test cavity 14 from the air inlet 11 through the air supply pipeline connected to the test cavity 14;

[0044] When the air outlet 12 is opened, the air suction device 40 is started, and the air in the test cavity 14 is sent to the detection instrument 50 by connecting with the detection instrument 50 to detect the organic gas content;

[0045] If the judgment result is good air tightness, the battery air tightness detection device lights up green and outputs the detection result; otherwise, it lights up red, outputs the detection result as poor air tightness, and generates a detection curve; when the detection result fluctuates, it is necessary to open the re-test port 13 above the test cavity 14 for re-testing.

[0046] It should be noted that, the multiple in the above embodiments refers to at least two.

[0047] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0048] 1. Solved the problem of poor accuracy of battery air tightness detection;

[0049] 2. Quickly and accurately detect batteries with poor airtightness, and the detection device has a simple structure and is easy to operate;

[0050] 3. Improve the accuracy of air tightness detection and reduce the probability of safety problems caused by poor battery air tightness.

[0051] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0054] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery air tightness detection device, characterized in that: include: A testing device, the testing device having a testing cavity for accommodating a battery to be tested; A gas supply device, which is connected to the test cavity through a gas supply pipeline to introduce gas into the test cavity during air tightness testing. A vacuum pump, the vacuum pump is connected to the test cavity through a vacuum pipeline, and evacuates the test cavity before introducing gas into the test cavity; an air suction device, the air suction device being connected to the test cavity through an air suction pipeline and sucking air from the test cavity after introducing gas into the test cavity; A detection instrument is connected to the air suction device and receives the gas sucked by the air suction device.

2. The battery air tightness detection device according to claim 1, characterized in that: The battery air tightness detection device further includes a valve, and the valve is provided on at least one of the gas supply pipeline, the vacuum pipeline, and the air suction pipeline.

3. The battery air tightness detection device according to claim 1, characterized in that: The battery air tightness detection device further includes a filter, and the filter is provided on at least one of the air supply pipeline, the vacuum pipeline, and the air intake pipeline.

4. The battery air tightness detection device according to claim 1, characterized in that: The battery air tightness detection device further comprises a containing device, which is arranged in the test cavity, and the battery to be tested is placed on the containing device.

5. The battery air tightness detection device according to claim 1, characterized in that: The battery air tightness detection device further includes a support member, which is disposed in the test cavity and abuts against an inner wall of the test cavity.

6. The battery air tightness detection device according to claim 5, characterized in that: The support member has through holes for gas circulation, the through holes penetrate through both sides of the support member, there are one or more through holes, and when there are more than one through holes, at least some of the through holes are arranged along the surface of the support member.

7. The battery air tightness detection device according to claim 1, characterized in that: The battery air tightness detection device also includes a base body, which includes an installation area and a detection area. The vacuum pump, the air suction device, and the detection instrument are located in the installation area, and the test device is located in the detection area.

8. The battery air tightness detection device according to claim 7, characterized in that: The installation area includes a first installation area and a second installation area. The first installation area, the detection area and the second installation area are arranged in sequence from bottom to top. The detection instrument is located in the first installation area, and the vacuum pump and the suction device are located in the second installation area.

9. The battery air tightness detection device according to claim 1, characterized in that: The testing device comprises an air inlet, an air outlet and a retest port for retesting, the air supply pipeline is connected to the air inlet, and the air suction pipeline is connected to the air outlet.

10. The battery air tightness detection device according to claim 1, characterized in that: The battery air tightness detection device also includes: A pressure sensor, the pressure sensor is connected to the testing device and detects the pressure in the testing cavity; A controller is electrically connected to the pressure sensor and the vacuum pump, and receives a pressure change signal from the pressure sensor and controls a working state of the vacuum pump.