Test battery preparation method, air tightness detection system and air tightness detection method

Abstract

The invention relates to a test battery preparation method, an air tightness detection system and an air tightness detection method. The test battery preparation method comprises the following steps: providing a to-be-tested battery; a detection hole is machined in the packaging film located in the empty packaging area through a hole machining device; an air inlet pipeline is inserted into the battery to be detected through the detection hole; and installing a sealing device at the detection hole and sealing the detection hole to obtain the tested battery. According to the technical scheme, the test battery provided with the detection hole and the gas inlet pipeline allowing the detection hole to be inserted into the test battery is prepared or used, and the detection hole is sealed, so that when the test gas is filled into the test battery through the gas inlet pipeline, the test gas cannot leak from the detection hole due to the sealing performance of the detection hole, and the test gas cannot leak from the test battery. And the accuracy of the air tightness detection result of the battery can be obviously improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery air tightness detection, and in particular to a test battery preparation method, an air tightness detection system and an air tightness detection method. Background Art

[0002] Airtightness is one of the important indicators that affect battery safety performance, and it is usually necessary to evaluate and test the airtightness strength of the battery. Currently, the airtightness testing of soft-pack batteries, which is widely used, is often limited to indirect methods, such as seal thickness testing, seal tensile strength testing, and mercurochrome leak testing. There is a lack of direct testing measures, and the test results are not accurate. Summary of the invention

[0003] Based on this, it is necessary to provide a test battery preparation method, an airtightness detection system and an airtightness detection method to address the problem of low accuracy of the airtightness detection structure of soft-pack batteries.

[0004] In a first aspect, the present application provides a test battery preparation method for preparing a test battery for airtightness detection, the test battery preparation method comprising:

[0005] A battery to be tested is provided, the battery to be tested comprising a packaging film and an electrode assembly located in the packaging film, the packaging film having a sealing area, a hollow area and a non-hollow area, the sealing area is located at an edge of the packaging film, the hollow area and the non-hollow area are jointly surrounded by the sealing area, and the electrode assembly is located in the non-hollow area;

[0006] Using a hole processing device to process a detection hole on the packaging film located in the empty package area;

[0007] Inserting the air intake pipe into the interior of the battery to be tested through the detection hole;

[0008] A sealing device is installed at the detection hole and the detection hole is sealed to obtain a test battery.

[0009] In some embodiments, the hole processing device includes a clamping seat and a drill rod, the clamping seat has a clamping groove and a mounting hole penetrating the groove side wall of the clamping groove, the drill rod can be inserted into the mounting hole and move axially along the mounting hole;

[0010] The detection hole is processed on the packaging film located in the empty package area by using a hole processing device, including:

[0011] Clamp the packaging film of the empty package area in the clamping groove of the clamping seat;

[0012] The drill rod is operated to move axially along the mounting hole of the clamp seat to drill a detection hole at a portion of the packaging film located in the clamping groove.

[0013] In some embodiments, the sealing device includes a sealing seat and a compression sleeve, the compression sleeve has a compression surface arranged opposite to the sealing seat, and an avoidance hole penetrating the compression surface, the compression surface is concavely provided with a sealing portion, and the sealing portion is formed with a sealing groove connected to the avoidance hole; the compression sleeve is movably arranged relative to the sealing seat to change the size of the compression space between the compression surface and the sealing seat; the air intake duct includes a first pipe portion and a second pipe portion that intersect and communicate with each other, and the second pipe portion is inserted into the interior of the battery to be tested;

[0014] The sealing device is installed at the detection hole and the detection hole is sealed to obtain a test battery, comprising:

[0015] The packaging film where the detection hole is located is placed in the compression space formed by the sealing seat and the compression sleeve, and the first tube portion is passed through the avoidance hole on the compression sleeve;

[0016] The sealing seat and the compression sleeve are brought closer to each other until the packaging film located in the compression space is sealed and compressed between the sealing seat and the compression surface, and the sealing groove of the sealing part is sealed and clamped with the second tube part to seal the detection hole, thereby obtaining the test battery.

[0017] In some embodiments, the sealing device further comprises a support plate, the support plate being erected on the sealing seat, the support plate being provided with a guide groove, the compression sleeve being detachably provided in the guide groove and being able to move along the guide groove to move relative to the sealing seat;

[0018] The packaging film where the detection hole is located is placed in a compression space formed by a sealing seat and a compression sleeve, and the first pipe portion of the air intake pipe is penetrated by the avoidance hole on the compression sleeve, including:

[0019] When the compression sleeve is detached from the guide groove of the support plate, the packaging film where the detection hole is located is placed on the sealing seat;

[0020] Put the compression sleeve back into the guide groove of the support plate, and the avoidance hole on the compression sleeve penetrates the first pipe part;

[0021] The sealing seat and the compression sleeve are close to each other, including:

[0022] The compression sleeve is moved along the guide groove toward the sealing seat.

[0023] In a second aspect, the present application provides an airtightness detection system for performing airtightness detection on a test battery, the airtightness detection system comprising:

[0024] A sealed box, used for accommodating a test battery, wherein the test battery is provided with a detection hole and an air intake duct inserted into the test battery through the detection hole, and the detection hole is sealed;

[0025] A vacuum pumping device, connected to the sealing box, for vacuuming the sealing box;

[0026] a gas supply device, used to communicate with an air inlet duct on the test battery located in the sealed box to fill the test battery with test gas;

[0027] a pressure detection device for detecting the internal pressure of the test battery; and

[0028] The gas content detection device is used to detect the test gas content in the sealed box.

[0029] In some embodiments, the airtightness detection system further includes a test battery preparation device, the test battery preparation device including:

[0030] A hole processing device, the hole processing device is used to process a detection hole on the battery to be tested, the detection hole is used for the air intake pipe to pass through and insert into the interior of the test battery;

[0031] The sealing device is used for being installed at the detection hole of the battery to be tested and sealing the detection hole.

[0032] In some embodiments, the hole processing device includes a clamping seat and a drill rod, the clamping seat has a clamping groove for clamping the battery to be tested, and a mounting hole passing through the side wall of the clamping groove, the drill rod is inserted into the mounting hole, and can move axially along the mounting hole to drill the detection hole at the position where the battery to be tested is located in the clamping groove.

[0033] In some embodiments, the sealing device includes a sealing seat and a compression sleeve, the compression sleeve having a compression surface arranged opposite to the sealing seat, and a avoidance hole passing through the compression surface, the compression surface is concavely provided with a sealing portion, the sealing portion is formed with a sealing groove connected to the avoidance hole, and the avoidance hole and the sealing groove are both used for the passage of an intake pipe; the compression sleeve is movably arranged relative to the sealing seat to change the size of the compression space between the compression surface and the sealing seat.

[0034] In some embodiments, the sealing seat includes a base and a sealing member, wherein the sealing member is disposed on the base, and the sealing member and the pressing surface are relatively spaced apart to form the pressing space.

[0035] In some embodiments, the sealing device further comprises a support plate, the support plate being erected on the sealing seat, a guide groove being provided on the support plate, the compression sleeve being detachably provided in the guide groove and being movable along the guide groove to move relative to the sealing seat.

[0036] In a third aspect, the present application provides an airtightness detection method, using an airtightness detection system as in any of the above embodiments, the airtightness detection method comprising:

[0037] Evacuate the sealed box containing the test battery;

[0038] Filling the test battery with test gas through an air inlet pipe on the test battery until the internal pressure of the test battery reaches a target pressure, and maintaining the pressure for a preset time;

[0039] detecting the test gas content in the sealed box;

[0040] When the test gas content exceeds a first threshold, the internal pressure of the test battery at the current moment is detected and recorded as a test pressure for evaluating the sealing performance of the test battery.

[0041] In some embodiments, after detecting the test gas content in the sealed box, the method further includes:

[0042] When the test gas content does not exceed the first threshold, the current target pressure is increased by a preset increment to obtain an updated target pressure, and the execution step is returned according to the updated target pressure: the test gas is filled into the test battery through the air intake pipe until the internal pressure of the test battery reaches the target pressure, and the pressure is maintained for a preset time; and / or,

[0043] In some embodiments, after detecting the internal pressure of the test battery at the current moment and recording it as the test pressure for evaluating the sealing performance of the test battery, the method further includes:

[0044] If the test pressure exceeds the pressure threshold, it is confirmed that the airtightness of the test battery is qualified.

[0045] In some embodiments, after detecting the internal pressure of the test battery at the current moment and recording it as the test pressure for evaluating the sealing performance of the test battery, the method further includes:

[0046] The test pressures of a plurality of the test batteries prepared under different sealing conditions are compared, and the test battery with the largest test pressure is confirmed as having the best sealing strength.

[0047] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0048] The above-mentioned test battery preparation method, airtightness detection system and airtightness detection method prepare or use a test battery with a detection hole and an air intake duct through which the detection hole is inserted into the test battery, and the detection hole is sealed. When the test gas is filled into the test battery through the air intake duct, the test gas cannot leak from the detection hole due to the sealing of the detection hole, which can significantly improve the accuracy of the test battery airtightness detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0050] Figure 1 FIG. 4 is a schematic flow chart of a method for preparing a test cell according to some embodiments.

[0051] Figure 2 Schematic diagram of the preparation process of test batteries according to some embodiments.

[0052] Figure 3 Schematic diagram of the structure of the hole processing device of some embodiments.

[0053] Figure 4 for Figure 3 Another orientation view of the hole processing device shown.

[0054] Figure 5 Schematic diagram of the structure of the air intake duct in some embodiments.

[0055] Figure 6 Schematic diagram of the structure of the sealing device of some embodiments.

[0056] Figure 7 for Figure 6 Another orientation view of the sealing device is shown.

[0057] Figure 8 Schematic diagram of the cooperation between the sealing device and the air intake pipeline in some embodiments.

[0058] Fig. 9 for Figure 8 Another orientation view of the structure shown.

[0059] Fig.10 Schematic diagram of the structure of a test battery in some embodiments.

[0060] Fig.11 Schematic diagram of an airtightness detection system according to some embodiments.

[0061] Fig.12 Schematic diagram of the flow of airtightness detection methods in some embodiments.

[0062] The reference numerals in the specific implementation manner are as follows:

[0063] 1000, airtightness detection system; 100, test battery preparation device; 10, hole processing device; 11, clamping seat; 11a, clamping groove; 11b, mounting hole; 12, drill rod; 12c, spike end; 20, sealing device; 21, sealing seat; 21d, base; 21f, sealing member; 22, pressing sleeve; 22h, pressing surface; k, avoidance hole; 22i, sealing part; c, sealing groove; w, pressing space; 23, support plate; g1 , guide groove; 200, sealing box; 300, vacuum device; 400, gas supply device; 500, pressure detection device; 600, gas content detection device; 700, controller; 1, test battery; 1A, battery to be tested; J, detection hole; A1, packaging film; A11, sealing area; A12, empty package area; A13, non-empty package area; A2, electrode assembly; 1B, air intake pipe; B1, first pipe part; B2, second pipe part. DETAILED DESCRIPTION

[0064] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0065] In the description of the present application, it should be understood that terms such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships, if any, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0066] In addition, if present, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In this application, unless otherwise clearly specified and limited, if any, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] In the present application, if it appears, unless otherwise clearly specified and limited, a first feature “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature “above”, “above” and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature “below”, “below” and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0069] It should be noted that, if present, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0070] In view of the problems mentioned in the background technology, in order to improve the accuracy of the air tightness detection of soft-pack batteries, in the related technology, an inflation needle is used to penetrate the aluminum-plastic film of the soft-pack battery and inflate the aluminum-plastic film to detect whether the soft-pack battery packaging is reliable and its air tightness. Considering that the scheme of piercing the aluminum-plastic film with an inflation needle has poor sealing and the accuracy of the detection result is still not high, the embodiment of the present application first proposes a test battery preparation method for preparing a test battery for air tightness detection, which can significantly improve the accuracy of the air tightness detection result of the soft-pack battery.

[0071] It is worth noting that the test battery proposed in the embodiment of the present application is prepared based on a soft-pack battery. The soft-pack battery generally includes a packaging film and an electrode assembly located in the packaging film. The packaging film may be, but is not limited to, an aluminum-plastic film. The electrode assembly generally includes a positive electrode sheet, a negative electrode sheet and a diaphragm, and the diaphragm is isolated and arranged between the positive electrode sheet and the negative electrode sheet. The electrode assembly may be a winding structure, a stacked structure, etc. For the specific structure of the soft-pack battery, please refer to the conventional settings.

[0072] The following is a detailed introduction to the test battery preparation method first proposed in the embodiment of the present application.

[0073] Figure 1 Schematic diagram of the process of preparing a test battery according to some embodiments of the present application. Figure 2 Schematic diagram of the preparation process of the test battery 1 of some embodiments. Figure 1 , and combined with Figure 2 It is understood that the test battery preparation method proposed in the embodiment of the present application includes:

[0074] S1, providing a battery 1A to be tested, the battery 1A to be tested comprising a packaging film A1 and an electrode assembly A2 located in the packaging film A1, the packaging film A1 having a sealing area A11, an empty area A12 and a non-empty area A13, the sealing area A11 being located at the edge of the packaging film A1, the empty area A12 and the non-empty area A13 being surrounded by the sealing area A11, and the electrode assembly A2 being located in the non-empty area A13;

[0075] The packaging film A1 is wrapped around the electrode assembly A2 to obtain a soft-packed battery 1A to be tested. Figure 2 As shown in FIG. 1 , the packaging film A1 is usually sealed at the peripheral edge area of ​​the battery 1A to be tested to form a sealing area A11. The packaging film A1 includes a middle area surrounded by the sealing area A11, and the middle area forms the internal space of the battery 1A to be tested. A portion of the middle area accommodates the electrode assembly A2 to form a non-empty area A13, and another portion of the middle area is empty to form an empty area A12.

[0076] S2, using the hole processing device 10 to process a detection hole J on the packaging film A1 located in the empty package area A12;

[0077] like Figure 2 As shown in b, a back hole processing device 10 is provided for punching holes in the empty package area A12 of the packaging film A1 to obtain the following Figure 2 c shows a battery 1A to be tested with a detection hole J. A hole is drilled in the empty package area A12 to avoid the electrode assembly A2. To facilitate the drilling operation, the detection hole J obtained by drilling is usually set through the thickness direction of the battery 1A to be tested. The detection hole J connects the inside of the battery 1A to be tested with the outside.

[0078] S3, inserting the air intake pipe 1B into the interior of the battery 1A to be tested through the detection hole J;

[0079] like Figure 2 As shown in FIG. 4 , after the detection hole J is processed on the battery 1A to be tested, one end of the air intake pipe 1B is inserted into the battery 1A to be tested through the detection hole J, and the other end of the air intake pipe 1B extends out of the detection hole J to facilitate the subsequent connection with the air supply device 400.

[0080] S4 , installing the sealing device 20 at the detection hole J and sealing the detection hole J to obtain the test battery 1 .

[0081] like Figure 2 As shown in FIG. 5 , after the air intake pipe 1B is inserted into the interior of the battery 1A to be tested through the detection hole J, a sealing device 20 is installed at the detection hole J. The sealing device 20 is used to seal the detection hole J to seal the internal space of the battery 1A to be tested to prevent air leakage. It can be understood that the sealing device 20 should avoid the air intake pipe 1B, and while sealing the detection hole J, allow the test gas to enter the interior of the battery 1A to be tested through the air intake pipe 1B. Finally, the following is obtained: Figure 2 e Test battery 1 shown.

[0082] Before the air tightness test of the soft-pack battery is performed, the test battery 1 is prepared by the above method, and the test hole J is punched in the empty package area A12 of the packaging film A1 of the test battery 1A by using the hole processing device 10, and the air intake pipe 1B is inserted into the test battery 1A through the test hole J, so that the inside of the test battery 1A can be subsequently inflated to support the air tightness test. In addition, a sealing device 20 is installed at the position of the test hole J, and the test hole J is sealed by the sealing device 20. When the test gas is filled into the test battery 1, due to the sealing effect of the sealing device 20, the test gas cannot leak from the test hole J, which can significantly improve the accuracy of the air tightness test result.

[0083] Moreover, the sealing device 20 is installed at the test battery 1 to ensure the sealing of the detection hole J. After the airtightness detection is completed, the sealing device 20 can be reused to make other test batteries 1, which can effectively reduce the test cost.

[0084] Figure 3 is a schematic diagram of the structure of a hole processing device 10 in some embodiments, Figure 4 for Figure 3 Another orientation view of the hole machining device 10 is shown.

[0085] In some embodiments, reference Figure 3 and Figure 4The hole processing device 10 includes a clamping seat 11 and a drill rod 12. The clamping seat 11 has a clamping groove 11a and a mounting hole 11b that passes through the groove side wall of the clamping groove 11a. The drill rod 12 can be inserted into the mounting hole 11b and move axially along the mounting hole 11b.

[0086] exist Figure 3 and Figure 4 In the example, the clamping groove 11a includes two groove side walls arranged opposite to each other, and the mounting hole 11b penetrates the two groove side walls. It can be understood that the mounting hole 11b includes two hole sections arranged at intervals in the depth direction thereof, and each hole section penetrates one groove side wall respectively. The two groove side walls of the clamping groove 11a are arranged opposite to each other in the depth direction of the mounting hole 11b. The axial direction of the drill rod 12 is substantially consistent with the depth direction of the mounting hole 11b. After the drill rod 12 is inserted into one of the hole sections, it can penetrate the clamping groove 11a and extend into the other hole section during the axial movement.

[0087] Preferably, the clamping groove 11a is substantially U-shaped. Figure 2 As shown in FIG. 1 , the packaging film A1 of the battery 1A to be tested located in the empty package area A12 is inserted into the clamping groove 11a from the U-shaped opening end of the clamping groove 11a (at this time, the depth direction of the mounting hole 11b is substantially consistent with the thickness direction of the battery 1A to be tested), and then an axial external force as shown in F1 is applied to the drill rod 12, so that the drill rod 12 moves along one of the hole sections of the mounting hole 11b, and in the process of penetrating the clamping groove 11a, the packaging film A1 in the empty package area A12 is penetrated to obtain a detection hole J. The excess packaging film A1 cut out by drilling can be discharged from the mounting hole 11b in the process of the drill rod 12 extending into another hole section, and the detection hole J is formed at the location where the cut packaging film A1 is located.

[0088] like Figure 3 and Figure 4 As shown, the width of the clamping groove 11a is fixed, and the structure of the clamping seat 11 is relatively simple. In other embodiments, the width of the clamping groove 11a can be designed to be adjustable, for example, the clamping seat 11 is designed to be retractable in the depth direction of the mounting hole 11b, which can not only adapt to various thicknesses of the battery 1A to be tested, but also strengthen the clamping degree of the battery 1A to be tested, and make the drilling process smoother.

[0089] Yes, refer to Figure 3 The end of the drill rod 12 used for cutting the packaging film A1 is a spike end 12c, and the spikes of the spike end 12c are more likely to pierce the packaging film A1, thereby improving the drilling efficiency. Specifically, the spike end 12c can be a sawtooth end, which usually has a plurality of saw teeth and can pierce the packaging film A1 from a plurality of positions at the same time. While the drilling efficiency is improved, the edge shape of the obtained detection hole J is more regular.

[0090] The drill rod 12 and the mounting hole 11b can be coaxially arranged, that is, the outer diameter of the drill rod 12 matches the inner diameter of the mounting hole 11b. In this way, when the drill rod 12 moves axially, under the guidance of the mounting hole 11b, the linearity is higher, and the drilling effect and drilling efficiency can be improved.

[0091] In addition, the hole processing device 10 can be equipped with a pressing mechanism, which drives the drill rod 12 to move axially, saving time and labor and improving drilling efficiency.

[0092] In a specific embodiment, based on the above-mentioned hole processing device 10, step S2 of processing the detection hole J on the packaging film A1 located in the empty package area A12 by using the hole processing device 10 includes:

[0093] S21, clamping the packaging film A1 of the empty package area A12 in the clamping groove 11a of the clamping seat 11;

[0094] S22, operate the drill rod 12 to move axially along the mounting hole 11b of the clamping seat 11, so as to drill a detection hole J at the portion of the packaging film A1 located in the clamping groove 11a.

[0095] At this time, the packaging film A1 can be fixed by the clamping groove 11a of the clamping seat 11 to prevent the packaging film A1 from moving during the drilling process. In addition, the drilling rod 12 is guided to move along its axis through the mounting hole 11b to drill the detection hole J. The drilling rod 12 moves more linearly, and the drilling efficiency and drilling quality are both higher.

[0096] Of course, when preparing the test battery 1, in addition to using the hole processing device 10 of the above embodiment, other hole processing tools can also be used, such as using scissors to cut the detection hole J on the packaging film A1, or using an air knife to cut the detection hole J on the packaging film A1.

[0097] Figure 5 Schematic diagram of the structure of the air intake duct 1B in some embodiments.

[0098] In some embodiments, reference Figure 5 The air intake pipe 1B includes a first pipe portion B1 and a second pipe portion B2 that intersect and communicate with each other, and the second pipe portion B2 is inserted into the interior of the battery to be tested 1A.

[0099] Among them, the first tube portion B1 and the second tube portion B2 can be straight tubes, curved tubes, etc. Usually, both are straight tubes for easy processing. The first tube portion B1 and the second tube portion B2 can be connected vertically but not limited to. In actual application, the first tube portion B1 of the air intake pipe 1B is inserted into the interior of the battery to be tested 1A through the side of the detection hole J, and the second tube portion B2 extends along the axial direction of the detection hole J. At this time, the structure of the air intake pipe 1B better matches the processing method of the detection hole J, which is convenient for introducing external gas into the interior of the battery to be tested 1A.

[0100] Figure 6 is a schematic diagram of the structure of the sealing device 20 in some embodiments, Figure 7 for Figure 6 Another orientation view of the sealing device 20 is shown. Figure 8 Schematic diagram of the cooperation between the sealing device 20 and the air intake pipeline in some embodiments. Fig. 9 for Figure 8 Another orientation view of the structure shown. Fig.10 Schematic diagram of the structure of the test battery 1 of some embodiments.

[0101] In some embodiments, reference Figure 6 and Figure 7 The sealing device 20 includes a sealing seat 21 and a compression sleeve 22. The compression sleeve 22 has a compression surface 22h arranged opposite to the sealing seat 21, and an avoidance hole k penetrating the compression surface 22h. A sealing portion 22i is concavely arranged on the compression surface 22h. The sealing portion 22i is formed with a sealing groove c connected to the avoidance hole k. The compression sleeve 22 is movably arranged relative to the sealing seat 21 to change the size of the compression space w between the compression surface 22h and the sealing seat 21.

[0102] Specifically, the sealing device 20 may be equipped with a moving drive member (not shown), which may be a linear module, etc., which is connected to the compression sleeve 22 and is used to drive the compression sleeve 22 to move away from or close to the sealing seat 21 to adjust the size of the compression space w. Figure 8 The compression space w is used to accommodate the packaging film A1 area where the detection hole J is located. When the compression sleeve 22 moves to the right position, the compression sleeve 22 can press the packaging film A1 on the sealing seat 21. The compression surface 22h cooperates with the sealing seat 21 to compress and seal the packaging film A1 where the detection hole J is located along the periphery of the detection hole J, thereby achieving the sealing of the detection hole J.

[0103] The sealing portion 22i provided inwardly on the pressing surface 22h may be a sealing block (such as a sealing block) embedded in the pressing sleeve 22. Figure 8 and Fig. 9 As shown in FIG. 2 , the compression sleeve 22 may be formed entirely of a sealing material. It is understandable that the sealing portion 22i is a part of the compression surface 22h that cooperates with the sealing seat 21 to seal the detection hole J, and the sealing groove c provided thereon can effectively avoid the second pipe portion B2 of the intake pipe 1B, so that the second pipe portion B2 will not be compressed by the compression surface 22h and the sealing seat 21, thereby ensuring that the intake pipe 1B can be used for intake.

[0104] Specifically, Figure 8 and Fig. 9As shown, the avoidance hole k is used to avoid the second pipe portion B2 of the intake pipe 1B. The aperture size of the avoidance hole k is required to avoid the second pipe portion B2, and the size of the pressing surface 22h is required to cover the packaging film A1 area to include the detection hole J, so as to cooperate with the sealing seat 21 to press and seal the detection hole J.

[0105] In one embodiment, referring to Figure 6 The sealing seat 21 includes a base 21d and a sealing member 21f. The sealing member 21f is arranged on the base 21d. The sealing member 21f and the pressing surface 22h are spaced relative to each other to form a pressing space w.

[0106] The base 21d is usually made of non-sealing material, which can reduce the preparation cost of the sealing seat 21. The sealing member 21f can be a rubber member, a silicone member, etc., and can specifically be a sealing ring, a sealing gasket, etc. When the sealing member 21f cooperates with the pressing surface 22h, it can effectively achieve the compression and sealing of the packaging film A1 around the detection hole J. When the sealing member 21f is a sealing ring, the size of the sealing ring should exceed the size of the detection hole J. Of course, in other embodiments, the sealing seat 21 can also be made of a sealing material as a whole.

[0107] In a specific embodiment, based on the sealing device 20 and the air intake duct 1B, the sealing device 20 is installed at the detection hole J and the detection hole J is sealed to obtain step S4 of testing the battery 1, including:

[0108] S41, placing the packaging film A1 where the detection hole J is located in the compression space w formed by the sealing seat 21 and the compression sleeve 22, and making the first tube part B1 pass through the avoidance hole k of the compression sleeve 22;

[0109] That is to say, when the packaging film A1 is placed in the compression space w, the detection hole J needs to be located in the compression space w, that is, it is necessary to ensure that the contour of the detection hole J is within the contour range of the compression surface 22h, and the contour of the compression surface 22h exceeds the contour of the detection hole J.

[0110] S42, the sealing seat 21 and the compression sleeve 22 are brought closer to each other until the packaging film A1 located in the compression space w is sealed and compressed between the sealing seat 21 and the compression surface 22h, and the sealing groove c of the sealing part 22i is sealed and clamped with the second tube part B2 to seal the detection hole J, thereby obtaining the test battery 1.

[0111] Specifically, Figure 2As shown in FIG. 5 , an external force shown in F2 can be applied to the compression sleeve 22, and the external force can be provided by manpower or by a movable driving member. Under the action of the external force F2, the sealing seat 21 and the compression sleeve 22 approach each other until the packaging film A1 is compressed and the detection hole J is sealed. At this time, the state of the movable driving member can be maintained to maintain the compression fit between the sealing seat 21 and the compression sleeve 22, and a locking member can also be provided on the sealing seat 21 and the compression sleeve 22. When the two are compressed, the locking member is operated to lock the two. Alternatively, the compression sleeve 22 is clamped by the guide groove g1 mentioned below, such as setting the guide groove g1 as a groove-shaped structure that gradually narrows in its extension direction. When the compression sleeve 22 approaches the sealing seat 21, the guide groove g1 gradually clamps the compression sleeve 22 until the compression sleeve 22 and the sealing seat 21 are compressed. Fit.

[0112] In this way, we finally get Fig.10 The test cell 1 is shown equipped with a sealing device 20 and an intake duct 1B.

[0113] In one embodiment, referring to Figure 6 and Figure 7 The sealing device 20 further includes a support plate 23 , which is vertically disposed on the sealing seat 21 . A guide groove g1 is disposed on the support plate 23 . The compression sleeve 22 is detachably disposed in the guide groove g1 and can move along the guide groove g1 to move relative to the sealing seat 21 .

[0114] Specifically, the support plate 23 is fixed on the base 21d. The support plate 23 and the base 21d can be integrally formed or separately provided. The extension direction of the guide groove g1 provided on the support plate 23 is consistent with the moving direction of the compression sleeve 22. Usually, one end of the guide groove g1 is open, and the compression sleeve 22 is inserted into the guide groove g1 through its open end, and can move along the guide groove g1 under the action of external force, and then approach or move away from the sealing seat 21.

[0115] At this time, under the guidance and matching of the guide groove g1, the movement process of the compression sleeve 22 is smoother, and the installation of the compression sleeve 22 is achieved.

[0116] Based on the above sealing device 20, in one embodiment, the step S41 of placing the packaging film A1 where the detection hole J is located in the compression space w formed by the sealing seat 21 and the compression sleeve 22, and making the first pipe portion B1 of the intake pipe 1B pass through the avoidance hole k on the compression sleeve 22, includes:

[0117] S411, when the compression sleeve 22 is detached from the guide groove g1 of the support plate 23, the packaging film A1 where the detection hole J is located is placed on the sealing seat 21;

[0118] Specifically, the compression sleeve 22 is taken out from the opening end of the guide groove g1 , and then the battery 1A to be tested with the air intake duct 1B inserted is placed on the sealing seat 21 , and the detection hole J is located in the area where the sealing seat 21 is located.

[0119] S412, the compression sleeve 22 is installed back into the guide groove g1 of the support plate 23, and the avoidance hole k on the compression sleeve 22 is penetrated by the first pipe portion B1;

[0120] Specifically, the compression sleeve 22 is inserted into the guide groove g1 from the opening end thereof, and the first pipe portion B1 is passed through the avoidance hole k. In this process, the position of the detection hole J on the sealing seat 21 can be adjusted so that the contour projection of the compression surface 22h of the compression sleeve 22 includes and exceeds the contour range of the detection hole J.

[0121] The step of bringing the sealing seat 21 and the compression sleeve 22 closer to each other comprises:

[0122] S421 , moving the compression sleeve 22 along the guide groove g1 toward the sealing seat 21 .

[0123] That is, the sealing seat 21 remains stationary, and the compression sleeve 22 is moved along the guide groove g1 to make the compression sleeve 22 approach the sealing seat 21 until the two cooperate to compress the packaging film A1 and seal the detection hole J. In this process, the relative position of the sealing groove c of the sealing part 22i and the second tube part B2 needs to be maintained. When the sealing seat 21 and the compression surface 22h are compressed and sealed, the second tube part B2 is inserted into the sealing groove c and is sealed by the sealing part 22i.

[0124] At this time, the compression sleeve 22 can be detached from the guide groove g1, which facilitates the first pipeline of the intake pipe 1B to pass through the avoidance hole k, and the intake pipe 1B is not easily bent or broken. In addition, the compression sleeve 22 moves along the guide groove g1, and the movement linearity is better, which can ensure that when the compression surface 22h and the sealing seat 21 are pressed and matched, the detection hole J can be smoothly sealed, and there will be no positional offset between the detection hole J and the compression surface 22h, resulting in the problem of the detection hole J not being properly sealed.

[0125] In addition, the embodiment of the present application also provides an airtightness detection system 1000 for performing airtightness detection on the test battery 1 . Fig.11 is a schematic diagram of an airtightness detection system 1000 of some embodiments, referring to Fig.11The airtightness detection system 1000 provided in the embodiment of the present application includes a sealing box 200, a vacuum pumping device 300, a gas supply device 400, a pressure detection device 500 and a gas content detection device 600. The sealing box 200 is used to accommodate the test battery 1. The test battery 1 is provided with a detection hole J and an air intake pipe 1B inserted into the test battery 1 through the detection hole J, and the detection hole J is sealed. The vacuum pumping device 300 is connected to the sealing box 200 and is used to vacuum the sealing box 200. The gas supply device 400 is used to communicate with the air intake pipe 1B on the test battery 1 located in the sealing box 200 to fill the test battery 1 with test gas. The pressure detection device 500 is used to detect the internal pressure of the test battery 1, and the gas content detection device 600 is used to detect the test gas content in the sealing box 200.

[0126] The test battery 1 can be prepared by the test battery preparation method described above, or by other methods, such as using hot melt sealing instead of the sealing device 20 in the step of sealing the test hole J. The test battery 1 used in the airtightness detection system 1000 is mainly a soft-pack battery, and of course it can also be extended to the airtightness detection of hard-shell batteries.

[0127] The sealed box 200 is used to provide a closed test environment. The gas supply device 400 is usually arranged outside the sealed box 200. The sealed box 200 may be provided with an air inlet hole for the air inlet pipe 1B to pass through and seal the air inlet pipe 1B. The air inlet pipe 1B is connected to the gas supply device 400. The test gas provided by the gas supply device 400 may be an inert gas (such as helium), nitrogen, etc. Regarding the specific structure of the gas supply device 400, those skilled in the art may make conventional settings.

[0128] The vacuum device 300 is arranged outside the sealed box 200, and is connected to the sealed box 200 through a vacuum pipe on the sealed box 200. It usually includes a vacuum pump, and those skilled in the art can make conventional settings for its structure. The pressure detection device 500 can be set on the air intake pipe 1B to obtain the internal pressure of the test battery 1 through the air intake pipe 1B. Of course, the pressure detection device 500 can also be directly set on the test battery 1. The pressure detection device 500 can be a pressure sensor, etc., and those skilled in the art can make conventional selections for it. The gas content detection device 600 selects conventional equipment according to the type of test gas for adaptive configuration. For example, when the test gas is helium, the gas content detection device 600 can be a helium mass spectrometer.

[0129] In one example, when performing an airtightness test, the test battery 1 is first placed in a sealed box 200, and the sealed box 200 is evacuated by a vacuum pump 300. Then, the test gas is delivered to the air intake pipe 1B by the gas supply device 400 until the pressure detection device 500 detects that the internal air pressure of the test battery 1 reaches the preset requirement. After waiting for a period of time, the content of the test gas in the sealed box 200 is detected by the gas content detection device 600, and the airtightness of the test battery 1 is determined according to the detection result of the gas content detection device 600. The higher the test gas content in the sealed box 200, the worse the airtightness of the test battery 1.

[0130] The airtightness detection system 1000 can not only directly detect the airtightness of the soft-pack battery, but also the detection hole J of the test battery 1 is sealed, and the connection between the air intake pipe 1B and the test battery 1 has good sealing performance, which will not affect the detection result and has high detection accuracy.

[0131] In some embodiments, the airtightness detection system 1000 further includes a test battery preparation device 100, which includes a hole processing device 10 and a sealing device 20. The hole processing device 10 is used to process a detection hole J on the battery 1A to be tested, and the detection hole J is used for the air intake pipe 1B to pass through and insert into the test battery 1. The sealing device 20 is used to be installed at the detection hole J of the battery 1A to be tested and seal the detection hole J.

[0132] In actual application, the hole processing device 10 and the sealing device 20 are used to prepare the test battery 1 described in the above embodiment to prepare a soft-pack battery type test battery 1. At this time, the detection hole J on the prepared test battery 1 is sealed by the sealing device 20.

[0133] In this way, the airtightness detection system 1000 can not only perform airtightness detection, but also prepare to test the battery 1, and has more complete and rich functions.

[0134] In some embodiments, the hole processing device 10 includes a clamping seat 11 and a drill rod 12. The clamping seat 11 has a clamping groove 11a for clamping the battery 1A to be tested, and a mounting hole 11b that passes through the side wall of the clamping groove 11a. The drill rod 12 is inserted into the mounting hole 11b and can move axially along the mounting hole 11b to drill a detection hole J at the position where the battery 1A to be tested is located in the clamping groove 11a.

[0135] For the description and introduction of the features of the clamping seat 11, the drill rod 12, the mounting hole 11b, the clamping groove 11a, etc. in the hole processing device 10, please refer to the records of the above embodiment, which will not be repeated here. Furthermore, the hole processing device 10 here has all other features of the hole processing device 10 in the above embodiment, and please refer to the above record for details. For the use of the hole processing device 10, please refer to the above description.

[0136] In some embodiments, the sealing device 20 includes a sealing seat 21 and a compression sleeve 22, the compression sleeve 22 has a compression surface 22h arranged opposite to the sealing seat 21, and an avoidance hole k penetrating the compression surface 22h, a sealing portion 22i is concavely arranged on the compression surface 22h, the sealing portion 22i forms a sealing groove c connected to the avoidance hole k, and the avoidance hole k and the sealing groove c are both used for the intake pipe 1B to pass through. The compression sleeve 22 is movably arranged relative to the sealing seat 21 to change the size of the compression space w between the compression surface 22h and the sealing seat 21.

[0137] Furthermore, the sealing seat 21 includes a base 21d and a sealing member 21f. The sealing member 21f is disposed on the base 21d. The sealing member 21f and the pressing surface 22h are spaced relative to each other to form a pressing space w.

[0138] Furthermore, the sealing device 20 also includes a support plate 23 , which is arranged on the sealing seat 21 . The support plate 23 is provided with a guide groove g1 . The compression sleeve 22 is detachably arranged in the guide groove g1 and can be guided along the guide groove g1 to move relative to the sealing seat 21 .

[0139] For the description and introduction of the features of the sealing seat 21, the compression sleeve 22, the compression surface 22h, the avoidance hole k, the sealing portion 22i, the sealing groove c, the compression space w, the base 21d, the sealing member 21f, the support plate 23, the guide groove g1, etc. in the sealing device 20, please refer to the records of the above embodiment, which will not be repeated here. Furthermore, the sealing device 20 here has all other features of the sealing device 20 in the above embodiment, and please refer to the above record for details. Please refer to the above description for the use of the sealing device 20.

[0140] In addition, the embodiment of the present application also provides an airtightness detection method, which is applied to the airtightness detection system 1000 in the above embodiment. Fig.12 is a schematic diagram of the flow chart of the airtightness detection method of some embodiments, referring to Fig.12 The airtightness detection method of the embodiment of the present application includes:

[0141] P1. Evacuate the sealed box 200 containing the test battery 1;

[0142] P2. Fill the test battery 1 with test gas through the air inlet pipe 1B on the test battery 1 until the internal pressure of the test battery 1 reaches the target pressure, and maintain the pressure for a preset time;

[0143] P3. Detect the test gas content in the sealed box 200;

[0144] P4. When the test gas content exceeds the first threshold, the internal pressure of the test battery 1 at the current moment is detected and recorded as the test pressure for evaluating the sealing performance of the test battery 1.

[0145] Specifically, after the battery 1 to be tested is placed in the sealed box 200, the sealed box 200 is evacuated by the vacuum device 300. Then, the test gas is delivered to the air inlet pipe 1B by the gas supply device 400, and the test gas enters the interior of the test battery 1. The pressure detection device 500 detects the internal pressure of the test battery 1. When the internal pressure of the test battery 1 reaches the target pressure, the delivery of the test gas is stopped, and the test battery 1 is kept at the target pressure for a preset time (such as 30s, 1min, 2min, etc.).

[0146] If the sealing of the test battery 1 is not good, the test gas inside the test battery 1 will overflow into the sealing box 200 during the pressure holding process. Therefore, after the pressure holding time is over, the gas content detection device 600 is used to detect the content of the test gas in the sealing box 200. If the content of the test gas exceeds the first threshold value, indicating that the test battery 1 is seriously leaking, the internal pressure of the test battery 1 at the current moment is obtained by the pressure detection device 500. The internal pressure at the current moment is recorded as the test pressure, and the test pressure is used to evaluate the sealing of the test battery 1. In other words, the airtightness detection method proposed in the embodiment of the present application mainly judges the airtightness of the test battery 1 by evaluating its pressure resistance. The higher the test pressure, the higher the pressure resistance and the better the airtightness.

[0147] The airtightness detection method is applied to the airtightness detection system 1000 of the above embodiment, which can not only directly obtain the test pressure for evaluating the sealing performance of the test battery 1, but also has the beneficial effect of better accuracy of the detection result.

[0148] It should be noted that the internal pressure at the current moment refers to the real-time pressure of the test battery 1 reacquired by the pressure detection device 500 when it is determined that the test gas content exceeds the first threshold.

[0149] In some embodiments, after step P3 of detecting the test gas content in the sealed box 200, the method further includes:

[0150] When the test gas content does not exceed the first threshold value, the current target pressure is increased by a preset increment to obtain an updated target pressure, and the execution of step P2 is returned according to the updated target pressure: the test gas is filled into the test battery 1 through the air intake pipe 1B on the test battery 1 until the internal pressure of the test battery 1 reaches the target pressure, and the pressure is maintained for a preset time.

[0151] The preset increment is a pressure increment, such as 0.05Mpa, 0.1Mpa. During the airtightness detection process, the test gas can be filled into the test battery 1 for multiple times, and each time the test gas is filled, the pressure inside the test battery 1 is increased by the preset increment pressure value. After each filling of the test gas, the pressure is maintained for a preset time, and after the preset time, the test gas content in the sealed box 200 is detected. If the test gas content is lower than the first threshold value, it means that the pressure resistance critical value has not been reached, then the test gas is continued to be filled, and the pressure inside the test battery 1 is increased by the preset increment pressure value, and this cycle is repeated until the test gas content exceeds the first threshold value, and no more test gas is filled.

[0152] At this time, the test gas is filled in sections to obtain the test pressure of the test battery 1 more accurately and precisely, which helps to improve the accuracy of the test result.

[0153] In some embodiments, after the step P4 of detecting the internal pressure of the test battery 1 at the current moment and recording it as the test pressure for evaluating the sealing performance of the test battery 1, the method further includes:

[0154] If the test pressure exceeds the pressure threshold, it is confirmed that the airtightness of the test battery 1 is qualified.

[0155] The test pressure indicates the compressive strength of the test battery 1. If the test pressure exceeds the pressure threshold, it means that the compressive strength of the test battery 1 is high, the packaging airtightness is good, and the airtightness is qualified. On the contrary, if the test pressure does not exceed the pressure threshold, it means that the compressive strength of the test battery 1 is low, the packaging airtightness is poor, and the airtightness is unqualified.

[0156] In this way, it can be directly determined whether the airtightness of the test battery 1 is qualified, so as to screen out qualified products and unqualified products, and can be used to screen good test batteries 1 and eliminate inferior test batteries 1.

[0157] In other embodiments, after the step P4 of detecting the internal pressure of the test battery 1 at the current moment and recording it as the test pressure for evaluating the sealing performance of the test battery 1, the method further includes:

[0158] The test pressures of a plurality of test batteries 1 prepared under different sealing conditions are compared, and the test battery 1 with the largest test pressure is confirmed as having the best sealing strength.

[0159] The sealing conditions refer to the process conditions for sealing the packaging film A1 of the soft-pack battery. The test batteries 1 prepared under different sealing conditions have different packaging airtightness. The greater the test pressure, the better the packaging airtightness, the higher the quality of the soft-pack battery produced under the sealing conditions, and the better the sealing conditions.

[0160] At this time, by comparing the test pressures of the test batteries 1 prepared under different sealing conditions, the test pressure with the best sealing strength can be screened, and then the best sealing conditions can be determined to improve the production quality of soft-pack batteries.

[0161] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0162] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A test battery preparation method for preparing a test battery for airtightness detection (1), characterized in that: The test battery preparation method comprises: A battery to be tested (1A) is provided, wherein the battery to be tested (1A) comprises a packaging film (A1) and an electrode assembly (A2) located in the packaging film (A1), wherein the packaging film (A1) has a sealing area (A11), an empty area (A12) and a non-empty area (A13), wherein the sealing area (A11) is located at the edge of the packaging film (A1), the empty area (A12) and the non-empty area (A13) are jointly surrounded by the sealing area (A11), and the electrode assembly (A2) is located in the non-empty area (A13); Using a hole processing device (10) to process a detection hole (J) on the packaging film (A1) located in the empty package area (A12); Inserting the air intake pipe (1B) into the interior of the battery to be tested (1A) through the detection hole (J); A sealing device (20) is installed at the detection hole (J) and seals the detection hole (J) to obtain a test battery (1).

2. The test battery preparation method according to claim 1, characterized in that: The hole processing device (10) comprises a clamping seat (11) and a drill rod (12); the clamping seat (11) has a clamping groove (11a) and a mounting hole (11b) penetrating a groove side wall of the clamping groove (11a); the drill rod (12) can be inserted into the mounting hole (11b) and move axially along the mounting hole (11b); The method comprises: using a hole processing device (10) to process a detection hole (J) on a packaging film (A1) located in the empty package area (A12), comprising: Clamping the packaging film (A1) of the empty package area (A12) in the clamping groove (11a) of the clamping seat (11); The drill rod (12) is operated to move axially along the mounting hole (11b) of the clamp seat (11) to drill a detection hole (J) at a portion of the packaging film (A1) located in the clamping groove (11a).

3. The test battery preparation method according to claim 2, characterized in that: The sealing device (20) comprises a sealing seat (21) and a compression sleeve (22); the compression sleeve (22) comprises a compression surface (22h) arranged opposite to the sealing seat (21) and an avoidance hole (k) penetrating the compression surface (22h); a sealing portion (22i) is concavely arranged on the compression surface (22h); the sealing portion (22i) is formed with a sealing groove (c) communicating with the avoidance hole (k); the compression sleeve (22) is movably arranged relative to the sealing seat (21) to change the size of the compression space (w) between the compression surface (22h) and the sealing seat (21); the air intake duct (1B) comprises a first pipe portion (B1) and a second pipe portion (B2) intersecting and communicating with each other; the second pipe portion (B2) is inserted into the interior of the battery to be tested (1A); The sealing device (20) is installed at the detection hole (J) and the detection hole (J) is sealed to obtain a test battery (1), comprising: The packaging film (A1) where the detection hole (J) is located is placed in a compression space (w) formed by a sealing seat (21) and a compression sleeve (22), and the first tube portion (B1) is penetrated by an avoidance hole (k) on the compression sleeve (22); The sealing seat (21) and the compression sleeve (22) are brought closer to each other until the packaging film (A1) located in the compression space (w) is sealed and compressed between the sealing seat (21) and the compression surface (22h), and the sealing groove (c) of the sealing portion (22i) is sealed and clamped with the second tube portion (B2) to seal the detection hole (J), thereby obtaining the test battery (1).

4. The test battery preparation method according to claim 3, characterized in that: The sealing device (20) further comprises a support plate (23), the support plate (23) being vertically arranged on the sealing seat (21), the support plate (23) being provided with a guide groove (g), the compression sleeve (22) being detachably arranged in the guide groove (g) and being movable along the guide groove (g) so as to move relative to the sealing seat (21); The packaging film (A1) where the detection hole (J) is located is placed in a compression space (w) formed by a sealing seat (21) and a compression sleeve (22), and a first pipe portion (B1) of an air intake pipe (1B) is provided with an avoidance hole (k) on the compression sleeve (22), comprising: When the compression sleeve (22) is detached from the guide groove (g) of the support plate (23), the packaging film (A1) where the detection hole (J) is located is placed on the sealing seat (21); The compression sleeve (22) is installed back into the guide groove (g) of the support plate (23), and the avoidance hole (k) on the compression sleeve (22) is penetrated through the first tube part (B1); The sealing seat (21) and the compression sleeve (22) are mutually adjacent to each other and include: The compression sleeve (22) is moved along the guide groove (g) toward the sealing seat (21).

5. An airtightness detection system (1000) for performing airtightness detection on a test battery (1), characterized in that: The airtightness detection system (1000) comprises: A sealed box (200) for accommodating a test battery (1), wherein the test battery (1) is provided with a detection hole (J) and an air intake pipe (1B) inserted into the test battery (1) through the detection hole (J), and the detection hole (J) is sealed; A vacuum pumping device (300) is connected to the sealing box (200) and is used to vacuum the sealing box (200); A gas supply device (400) is used to communicate with an air inlet pipe (1B) on the test battery (1) located in the sealed box (200) so as to fill the test battery (1) with test gas; A pressure detection device (500) for detecting the internal pressure of the test battery (1); and The gas content detection device (600) is used to detect the test gas content in the sealed box (200).

6. The airtightness detection system (1000) according to claim 5, characterized in that: The airtightness detection system (1000) further comprises a test battery preparation device (100), wherein the test battery preparation device (100) comprises: A hole processing device (10), the hole processing device (10) being used to process a detection hole (J) on the battery to be tested (1A), the detection hole (J) being used for an air intake pipe (1B) to pass through and be inserted into the interior of the test battery (1); A sealing device (20) is used for being installed at the detection hole (J) of the battery to be tested (1A) and sealing the detection hole (J).

7. The airtightness detection system (1000) according to claim 6, characterized in that: The hole processing device (10) comprises a clamping seat (11) and a drill rod (12); the clamping seat (11) has a clamping groove (11a) for clamping a battery to be tested (1A), and a mounting hole (11b) penetrating the groove side wall of the clamping groove (11a); the drill rod (12) is inserted into the mounting hole (11b) and can move axially along the mounting hole (11b) to drill the detection hole (J) at a portion of the battery to be tested (1A) located in the clamping groove (11a).

8. The airtightness detection system (1000) according to claim 7, characterized in that: The sealing device (20) comprises a sealing seat (21) and a compression sleeve (22); the compression sleeve (22) has a compression surface (22h) arranged opposite to the sealing seat (21) and a avoidance hole (k) penetrating the compression surface (22h); a sealing portion (22i) is concavely arranged on the compression surface (22h); the sealing portion (22i) is formed with a sealing groove (c) communicating with the avoidance hole (k); the avoidance hole (k) and the sealing groove (c) are both used for the air intake pipe (1B) to pass through; the compression sleeve (22) is movably arranged relative to the sealing seat (21) to change the size of the compression space (w) between the compression surface (22h) and the sealing seat (21); The sealing seat (21) comprises a base (21d) and a sealing member (21f), wherein the sealing member (21f) is arranged on the base (21d), and the sealing member (21f) and the pressing surface (22h) are spaced relative to each other to form the pressing space (w); The sealing device (20) further comprises a support plate (23), wherein the support plate (23) is vertically arranged on the sealing seat (21), and a guide groove (g) is provided on the support plate (23). The compression sleeve (22) is detachably arranged in the guide groove (g) and is movable along the guide groove (g) to move relative to the sealing seat (21).

9. An airtightness detection method, applied to the airtightness detection system (1000) according to any one of claims 5 to 8, characterized in that: The airtightness detection method comprises: Applying vacuum to the sealed box (200) containing the test battery (1); Filling the test battery (1) with test gas through an air inlet pipe (1B) on the test battery (1) until the internal pressure of the test battery (1) reaches a target pressure, and maintaining the pressure for a preset time; detecting the content of the test gas in the sealed box (200); When the test gas content exceeds a first threshold, the internal pressure of the test battery (1) at the current moment is detected and recorded as a test pressure for evaluating the sealing performance of the test battery (1).

10. The airtightness detection method according to claim 9, characterized in that: After detecting the test gas content in the sealed box (200), the method further comprises: When the test gas content does not exceed the first threshold, the current target pressure is increased by a preset increment to obtain an updated target pressure, and the execution steps are returned according to the updated target pressure: the test gas is filled into the test battery (1) through the air intake pipe (1B) until the internal pressure of the test battery (1) reaches the target pressure, and the pressure is maintained for a preset time; and / or, After detecting the internal pressure of the test battery (1) at the current moment and recording it as the test pressure for evaluating the sealing performance of the test battery (1), it also includes: if the test pressure exceeds the pressure threshold, confirming that the airtightness of the test battery (1) is qualified; and / or, comparing the test pressures of multiple test batteries (1) prepared under different sealing conditions, and confirming the test battery (1) with the largest test pressure as having the best sealing strength.

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