Battery pack sealing performance testing device

Abstract

The embodiment of the utility model discloses a battery pack sealing performance testing device, comprising: an installation assembly including a first installation assembly and a second installation assembly, the first installation assembly movably covering the second installation assembly so that a first testing cavity and a second testing cavity are communicated to form a testing cavity; the test cavity is used for accommodating a tested workpiece; in the working process of the first vacuum pump, negative pressure is generated in the test cavity, so that the mounting assembly generates elastic deformation to reduce the volume of the test cavity; and a second connecting pipeline of the second vacuum pump extends into the test cavity through the second through hole and is communicated with the air vent of the tested workpiece so as to vacuumize the cavity of the tested workpiece. According to the embodiment of the utility model, negative pressure is generated in the test cavity. The negative pressure environment can promote the installation assembly to generate elastic deformation, and the size of the test cavity is further reduced, so that the tested workpiece is wrapped more tightly, and the test accuracy and the detection efficiency are improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of testing technology, and in particular to a battery pack sealing test device. Background Art

[0002] Currently, power battery packs are core components of new energy vehicles, and their sealing is a major factor affecting their safety performance. Therefore, before power battery packs are installed in vehicles, automakers conduct sealing tests on them to ensure safety. Power battery pack sealing is typically tested using vacuum tracer gas or vacuum electrolyte gas leak detection methods, typically using the accumulation method and the high vacuum method. The accumulation method involves placing the power battery pack in a test chamber and allowing it to stand for a period of time to allow tracer gas or electrolyte gas to accumulate to a certain concentration within the power battery pack. The concentration of the tracer gas or electrolyte gas in the chamber is then measured to determine the power battery pack's sealing performance. The high vacuum method involves placing the power battery pack in a heavy metal test chamber. During the test, both the power battery pack and the test chamber are simultaneously evacuated. The battery pack is then filled with helium. The concentration of the tracer gas or electrolyte gas in the chamber is then measured to determine the power battery pack's sealing performance.

[0003] The defects of the existing testing method: Due to the large volume of the power battery pack, the volume of the test chamber currently used to store the power battery pack is also relatively large, and the evacuation time is long. During the high vacuum test, the internal volume of the test chamber and the battery pack are different, and the diameter of the evacuation port is also different. The evacuation rate inside and outside the power battery pack is inconsistent, making it difficult to ensure that the pressure difference between the inside and outside of the power battery pack is within a safe range during evacuation. When the pressure difference is too large, the battery pack may be flattened or expand excessively, posing a risk of rupture. After the evacuation is completed, helium needs to be filled. During this process, the battery pack will also expand. Due to the uncertainty of the state of the battery pack after evacuation, if the pressure is too high, the battery pack may rupture, and if the pressure is too low, the leak detection effect may not be achieved. The safety risk of the high vacuum method in the current testing method is high and the test effect is poor. If the accumulation method is used for testing, if there is a leak at the end in contact with the test chamber, the power battery pack is in close contact with the test chamber, so the leak may not spread to the test chamber, resulting in misjudgment, and the test chamber has a large residual volume. The time cost of the accumulation method in the current testing method is high and the test effect is poor. In view of the shortcomings of existing testing methods, it is necessary to design a testing device that can solve the pain points of power battery pack sealing detection. Utility Model Content

[0004] The embodiment of the present utility model provides a battery pack sealing test device, which can reduce the cost of power battery pack sealing testing and improve the testing effect.

[0005] In a first aspect, an embodiment of the present invention provides a battery pack sealing test device, comprising:

[0006] a mounting assembly, the mounting assembly comprising a first mounting assembly and a second mounting assembly, the first mounting assembly being provided with a first test cavity; the second mounting assembly being provided with a second test cavity, the second mounting assembly being further provided with a first through hole and a second through hole communicating with the second test cavity, the first mounting assembly being movably covered on the second mounting assembly so that the first test cavity and the second test cavity communicate with each other to form a test cavity; the test cavity being used to accommodate a workpiece to be tested;

[0007] A vacuum pump assembly, the vacuum pump assembly includes a first vacuum pump and a second vacuum pump, the first connecting pipe of the first vacuum pump is connected to the test cavity through a first through hole to realize the vacuum operation of the test cavity; during the operation of the first vacuum pump, negative pressure is generated in the test cavity, causing the mounting assembly to produce elastic deformation to reduce the volume of the test cavity; the second connecting pipe of the second vacuum pump extends into the test cavity through the second through hole and is connected to the vent of the workpiece to be measured to realize the vacuum operation of the cavity of the workpiece to be measured.

[0008] As an optional embodiment, in the first aspect of the embodiment of the utility model, the first mounting assembly includes a movable frame, a connecting elastic member and a movable assembly; the movable frame is connected to the movable assembly through the connecting elastic member. During the operation of the first vacuum pump, negative pressure is generated in the test chamber so that the connecting elastic member generates downward pressure on the movable assembly so that the movable assembly abuts against the workpiece to be measured.

[0009] As an optional implementation, in the first aspect of the embodiment of the present utility model, a first diffusion structure is provided at the movable component, and the first diffusion structure is used to diffuse the tracer gas leaked from the workpiece to be tested into the test cavity.

[0010] As an optional implementation, in the first aspect of the embodiment of the present utility model, a second diffusion structure is provided in the second test cavity of the second mounting assembly; the second diffusion structure is used to diffuse the tracer gas leaked from the workpiece to be tested into the test cavity.

[0011] As an optional embodiment, in the first aspect of the embodiment of the present utility model, the first and second diffusion structures are further configured to prevent the leakage between the movable assembly and the workpiece being measured from being blocked when the movable assembly and the workpiece are in contact, thereby preventing the tracer gas from quickly reaching the detection port. As an optional embodiment, in the first aspect of the embodiment of the present utility model, a first isolation valve is provided on the first connecting pipeline, the first isolation valve being configured to control the on / off state of the first connecting pipeline, and a second isolation valve is provided on the second connecting pipeline, the second isolation valve being configured to control the on / off state of the second connecting pipeline.

[0012] As an optional embodiment, in the first aspect of the embodiment of the utility model, it also includes a third connecting pipeline and an inflation component connected to the third connecting pipeline, the third connecting pipeline is connected to the second connecting pipeline, and a third isolation valve is provided on the third connecting pipeline. The inflation component is used to fill the tracer gas into the workpiece to be measured.

[0013] As an optional implementation, in the first aspect of the embodiment of the present utility model, the testing device further includes a detection component, and the detection component is used to detect the tracer gas leaked from the test cavity.

[0014] As an optional implementation, in the first aspect of the embodiment of the present utility model, a sealing ring is provided at the second mounting assembly, and when the first mounting assembly and the second mounting assembly are engaged, the sealing ring is used to seal the connection therebetween.

[0015] As an optional implementation, in the first aspect of the embodiment of the present utility model, the first installation component and the second installation component are both elastic members.

[0016] The embodiment of the present invention generates negative pressure in the test chamber. This negative pressure environment can cause the mounting assembly to produce elastic deformation, further reducing the volume of the test chamber, thereby more tightly wrapping the workpiece to be tested, and improving the accuracy and efficiency of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a battery pack sealing test device provided by an embodiment of the present utility model;

[0018] Figure 2 This is a schematic structural diagram of a battery pack sealing test device with a test assembly provided by an embodiment of the present invention;

[0019] Figure 3 1 is a schematic structural diagram of another battery pack sealing test device provided by an embodiment of the present invention;

[0020] Figure 41 is a schematic structural diagram of another battery pack sealing test device with a test assembly provided by an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram showing the diffusion structure provided by an embodiment of the present utility model;

[0022] Figure numerals: 1. First mounting assembly; 11. Movable frame; 12. Connecting elastic member; 13. Movable assembly; 14. First diffusion structure; 2. Second mounting assembly; 21. First through hole; 22. Second through hole; 23. Second diffusion structure; 3. First test chamber; 4. Second test chamber; 5. Test chamber body; 6. First vacuum pump; 61. First connecting pipeline; 62. First isolation valve; 7. Second vacuum pump; 71. Second connecting pipeline; 72. Second isolation valve; 8. Detection assembly; 9. Inflation assembly; 91. Third connecting pipeline; 92. Third isolation valve; 10. Workpiece to be measured. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention clearer, the specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except where otherwise specified, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and cannot be understood as limiting this application.

[0024] In the description of this application, it should be understood that the terms "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, a connection through an intermediary medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0026] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. In addition, the terms "including," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product, or apparatus.

[0027] like Figures 1 to 5 As shown, the embodiment of the present invention provides a battery pack sealing test device, comprising:

[0028] The mounting assembly includes a first mounting assembly 1 and a second mounting assembly 2. The first mounting assembly 1 is provided with a first test cavity 3; the second mounting assembly 2 is provided with a second test cavity 4. The second mounting assembly 2 is further provided with a first through hole 21 and a second through hole 22 that are in communication with the second test cavity 4. The first mounting assembly 1 can be movably covered on the second mounting assembly 2 so that the first test cavity 3 and the second test cavity 4 are in communication to form a test cavity 5; the test cavity 5 is used to accommodate a workpiece 10 to be measured;

[0029] A vacuum pump assembly includes a first vacuum pump 6 and a second vacuum pump 7. The first connecting pipe 61 of the first vacuum pump 6 is connected to the test cavity 5 through the first through hole 21 to realize the vacuum operation of the test cavity 5; during the operation of the first vacuum pump 6, a negative pressure is generated in the test cavity 5, causing the mounting assembly to produce elastic deformation to reduce the volume of the test cavity 5; the second connecting pipe 71 of the second vacuum pump 7 extends into the test cavity 5 through the second through hole 22 and is connected to the vent of the workpiece to be measured 10 to realize the vacuum operation of the cavity of the workpiece to be measured 10.

[0030] During specific implementation, the mounting assembly is elastically deformable, and this elastic deformation can be used to change the size of the test cavity 5. The elastic deformation of the mounting assembly can be either the first mounting assembly 1 or the second mounting assembly 2, or both the first mounting assembly 1 and the second mounting assembly 2.

[0031] The mounting assembly consists of a first mounting assembly 1 and a second mounting assembly 2. This design facilitates assembly and disassembly, and also facilitates positioning and fixing the workpiece 10 to be tested. The first mounting assembly 1 is provided with a first test cavity 3, while the second mounting assembly 2 is provided with a second test cavity 4, and is equipped with a first through hole 21 and a second through hole 22 that communicate with the second test cavity 4. When the first mounting assembly 1 is covered on the second mounting assembly 2, the first test cavity 3 is connected to the second test cavity 4, together forming a complete test cavity 5. The test cavity 5 is designed to accommodate the workpiece 10 to be tested, ensuring that it can be in a relatively closed environment during the sealing test.

[0032] The vacuum pump assembly includes a first vacuum pump 6 and a second vacuum pump 7, both of which are connected to the test chamber 5 and the vents of the workpiece 10 to be tested via a first connecting line 61 and a second connecting line 71, respectively. The first vacuum pump 6 evacuates the test chamber 5 through the first through-hole 21, thereby generating a negative pressure within the chamber. This negative pressure causes elastic deformation of the mounting assembly, thereby reducing the volume of the test chamber 5. This design facilitates a tighter fit to the workpiece 10 to be tested, prevents excessive expansion of the workpiece 10, shortens the time required for sealing testing, and improves test efficiency.

[0033] More preferably, the first mounting assembly 1 includes a movable frame 11, a connecting elastic member 12, and a movable assembly 13. The movable frame 11 is connected to the movable assembly 13 via the connecting elastic member 12. During operation of the first vacuum pump 6, negative pressure is generated within the test chamber 5, causing the connecting elastic member 12 to exert downward pressure on the movable assembly 13, causing the movable assembly 13 to abut against the workpiece 10 under test, thereby preventing excessive deformation of the workpiece under test. A first diffusion structure 14 is provided on the movable assembly 13, and is used to diffuse tracer gas leaking from the workpiece 10 under test into the test chamber 5. A second diffusion structure 23 is provided within the second test chamber 4 of the second mounting assembly 2. The second diffusion structure 23 is used to diffuse tracer gas leaking from the workpiece 10 under test into the test chamber 5.

[0034] The above is a specific implementation method. Figure 3 and Figure 4As shown, the cavity is composed of two parts, an upper part and an lower part, which form a closed test cavity 5 when combined. The lower part is a fixed component with a diffusion channel (such as a guide tube, etc.) at the bottom. The upper part is composed of a diffusion channel, an elastic diaphragm, a movable component 13 and a movable frame 11. The movable frame 11 and the movable component 13 are movably connected. The movable component 13 can move up and down along the vertical direction of the movable frame 11. The diffusion channel is installed on the inner side of the movable component 13 facing the workpiece 10 to be measured, and the elastic diaphragm is installed on the outer side of the movable component 13 facing the atmosphere. When the workpiece 10 and the test chamber 5 are evacuated at the same time, the movable component 13 will fall as the vacuum degree of the chamber decreases, and the movable component 13 will abut against the workpiece 10. When the workpiece 10 expands, the abutment between the movable component 13 and the workpiece 10 will limit its expansion and protect the workpiece 10. When the movable component 13 abuts against the workpiece 10, in order to ensure that the tracer gas of the workpiece 10 can leak into the elastic chamber, the elastic chamber mentioned here is the test chamber. A diffusion channel is also provided between the movable component 13 and the workpiece 10 to be measured. The diffusion channel leaves a gap between the movable component 13 and the workpiece 10 to allow the tracer gas to leak into the elastic cavity. The diffusion channel can also be used to guide the tracer gas, making it convenient for the tracer gas to quickly reach the detection component 8, thereby improving the detection efficiency. The elastic diaphragm shrinks as the vacuum degree in the cavity decreases, and fits tightly with the movable component 13, blocking the gap between the movable frame 11 and the movable component 13, reducing the tracer gas residue and improving the reliability of the test results.

[0035] In this embodiment, a gap is left between the elastic cavity and the workpiece 10 to be measured through the diffusion channel, so that the tracer gas in the workpiece 10 to be measured can leak into the elastic cavity.

[0036] In this embodiment, a diffusion channel is provided so that a gap is left when the elastic diaphragm (or movable component 13) is tightly fitted to the power battery pack, ensuring that the leakage location of the power battery pack can leak into the elastic cavity. In addition, the diffusion channel can also guide the tracer gas to flow to the detection component 8, thereby improving the detection efficiency and the reliability of the detection results.

[0037] More preferably, the first and second diffuser structures 14, 23 are further configured to prevent leakage between the movable assembly 13 and the workpiece 10 from being blocked when the two are in contact, thereby preventing the tracer gas from quickly reaching the detection port. The first and second diffuser structures 14, 23 are elastic flow guide tubes with multiple air holes disposed on their sidewalls. When the first and second diffuser structures 14, 23 come into contact with the workpiece 10, the multiple air holes engage the workpiece 10.

[0038] The diffusion structure here can have various forms, and its main purpose is to allow the gas leaked from the workpiece 10 to be released and detected by the subsequent detection component 8; if there is no such diffusion structure, since the movable component 13 is tightly fitted to the workpiece 10, the overall gas is not easy to leak out, and the actual leakage of the workpiece 10 cannot be detected.

[0039] More preferably, the first connecting line 61 is provided with a first isolation valve 62 for controlling the on / off state of the first connecting line 61. The second connecting line 71 is provided with a second isolation valve 72 for controlling the on / off state of the second connecting line 71. The test device further includes a third connecting line 91 and an inflation assembly 9 connected thereto. The third connecting line 91 is connected to the second connecting line 71 and is provided with a third isolation valve 92. The inflation assembly 9 is used to inject tracer gas into the workpiece 10 being tested. The test device also includes a detection assembly 8 for detecting tracer gas leakage from the first connecting line 61. The isolation valves herein may be air-controlled valves or solenoid valves.

[0040] Since the movable component 13 abuts against the workpiece 10 to be tested, the pressure of the charged tracer gas can be increased. The higher the pressure of the charged tracer gas, the easier it is for the tracer gas to leak out, thereby shortening the testing time and improving the testing efficiency.

[0041] More preferably, a sealing ring is provided on the second mounting assembly 2. When the first mounting assembly 1 and the second mounting assembly 2 are engaged, the sealing ring is used to seal the connection. The corresponding sealing detection is achieved through the sealing ring. Specifically, when the first mounting assembly 1 and the second mounting assembly 2 are engaged, a groove is provided on the second mounting assembly 2, and a sealing ring is provided in the groove. A protrusion is provided on the first mounting assembly 1 to cooperate with the groove of the first mounting assembly 1, and the presence of the sealing ring improves the overall sealing performance.

[0042] More preferably, both the first mounting assembly 1 and the second mounting assembly 2 are elastic members.

[0043] The above is another specific embodiment, that is, the elastic diaphragm is used as a whole to achieve fixed connection. Figure 1As shown, an elastic diaphragm (movable component 13) is used, and the elastic sealing surface (movable component 13) fits tightly with the power battery pack, generating a force opposite to the expansion of the product, which can prevent the power battery pack from expanding and bursting in a vacuum test environment, thereby improving the safety of the test; and the advantage of using an elastic surface is that the contraction of the elastic surface reduces the residual volume of the elastic cavity, shortening the evacuation time of the product test. Due to the small residual volume, the tracer gas is more easily diffused in the elastic cavity to the detection component 8, and even low-concentration leaks can be detected quickly and readily.

[0044] like Figure 1 and Figure 2 As shown, the test cavity 5 shown is entirely composed of an elastic diaphragm, and the workpiece 10 to be tested (power battery pack) is wrapped as a whole by the elastic diaphragm. The elastic diaphragm is provided with a diffusion channel (such as a guide tube, etc.). The diffusion channel is used to guide the tracer gas, so that the tracer gas can quickly reach the detection component 8 and improve the detection efficiency. When testing, it is necessary to evacuate the cavity and the workpiece 10 to be tested at the same time to reduce the pressure difference between the inside and outside of the workpiece 10 to be tested during evacuation, and prevent the pressure difference from being too large to cause serious deformation of the workpiece 10 to be tested. During the evacuation process, the elastic diaphragm will shrink and fit closely with the workpiece 10 to be tested. At this time, the residual volume in the elastic cavity is very small, and the tracer gas can quickly reach the detection component 8 through the diffusion channel, which greatly shortens the detection time.

[0045] like Figure 5 As shown, in specific implementations, an elastic membrane with grooves can be used, with the grooves serving as diffusion channels. Alternatively, a flexible conduit with uniformly distributed holes can be used as the diffusion channel. The diffusion channel is not directly connected to the connecting assembly; the detection assembly 8 provides suction. The primary function of the diffusion channel is to collect the tracer gas into the instrument and guide the tracer gas toward the detection assembly 8 through suction.

[0046] The specific working principle of this embodiment is as follows:

[0047] Testing process: evacuation (the workpiece 10 to be tested and the elastic cavity are evacuated at the same time), inflation (filling with helium or other tracer gas), leak detection, gas recovery (recovering helium or other tracer gas), vacuum breaking (breaking the vacuum state of the workpiece 10 to be tested and the elastic cavity), test completion, workpiece removal, and state to be tested: the upper half of the elastic cavity rises to facilitate the placement of the workpiece 10 to be tested into the elastic cavity.

[0048] Vacuuming: The first mounting assembly 1 descends until it abuts against the first mounting assembly 2 to form a closed space, and at the same time, the first vacuum pump 6 and the second vacuum pump 7 are started, and the first isolation valve 62 and the second isolation valve 72 are opened to evacuate the workpiece 10 and the elastic cavity. During the vacuuming process, the movable assembly 13 will descend as the pressure in the elastic cavity decreases until it abuts against the workpiece 10. The advantage of vacuuming at the same time is that it can ensure that the pressure difference between the workpiece 10 and the elastic cavity is not too large, reducing the risk of deformation of the workpiece 10 during the vacuuming process and improving the reliability of the detection. At the same time, since the movable assembly 13 abuts against the workpiece 10, it can effectively prevent the workpiece 10 from expanding during the vacuuming process, thereby protecting the workpiece 10.

[0049] Inflation: After the workpiece 10 and the elastic cavity are evacuated, the first isolation valve 62 and the second isolation valve 72 are closed simultaneously. Then, tracer gas is injected into the workpiece 10. In the battery industry, helium or a mixture of hydrogen and nitrogen is commonly used as the tracer gas. During the gas injection process, since the pressure difference between the inside and outside of the workpiece 10 is very small and the movable component 13 is in contact with the workpiece 10 to limit its expansion, a relatively high pressure can be injected into the workpiece 10 without worrying about the workpiece 10 being deformed or ruptured due to excessive expansion. High-pressure tracer gas is more likely to leak out.

[0050] Leak Detection: When the movable assembly 13 is in contact with the workpiece 10, the volume of the elastic cavity is reduced. A small volume is more conducive to the diffusion of the tracer gas. If an elastic diaphragm is used for the elastic cavity, the residual volume of the elastic cavity will be very small, allowing the tracer gas to diffuse more easily throughout the cavity. The same leak rate can be detected more quickly in a small-volume cavity. (Trivial leaks require a long accumulation time using a traditional vacuum chamber and cannot be detected within the specified time, thus being considered undetectable. However, the significantly reduced residual volume of the cavity using an elastic cavity shortens the accumulation time, allowing tiny leaks to be detected within the specified time, significantly shortening the detection time and indirectly improving the detection accuracy of the detection equipment.) This shortens detection time and improves detection efficiency. A diffusion channel is also separated between the movable assembly 13 and the workpiece 10. The diffusion channel creates a gap between the movable assembly 13 and the workpiece 10, allowing the tracer gas to leak into the elastic cavity. The diffusion channel can also be used to guide the tracer gas toward the detection assembly 8, improving detection efficiency.

[0051] Recovering gas: After the test is completed, the second vacuum pump 7 is connected to the recovery system, and then the second isolation valve 72 is opened to recover and reuse the tracer gas in the workpiece 10 to be tested. After the recovery is completed, the second isolation valve 72 is closed to disconnect the second vacuum pump 7 from the recovery system.

[0052] Breaking the vacuum: restoring the workpiece 10 and the elastic cavity to atmospheric pressure. Since the movable component 13 abuts against the workpiece 10, it can prevent the workpiece 10 from being damaged by excessive expansion due to a large pressure difference inside the workpiece 10 during the exhaust process.

[0053] Test completed: After breaking the vacuum, the upper part of the elastic cavity rises and returns to the state to be tested, and the workpiece is taken out.

[0054] The advantage of using an elastic cavity is that during the test process, the elastic diaphragm contracts under the action of vacuum, which can well wrap the battery pack, greatly reducing the residual volume in the elastic cavity, making it easier for the tracer gas to diffuse to the detection component 8, thereby being detected by the detection component 8, shortening the detection time, and improving the test efficiency. At the same time, the elastic cavity is low in cost and easy to maintain. Compared with the traditional test cavity 5, it is more suitable for battery pack testing, especially for large-volume test objects such as automotive battery packs, and has a higher cost-effectiveness.

[0055] The workpiece 10 to be tested here can be any device requiring a leak test, such as an automotive battery pack or fuel tank. To address the existing issues with leak testing, this embodiment develops a leak testing device for automotive battery packs based on the properties of elastic membranes. This device utilizes the deformation principle of elastic membranes to reduce the residual volume of the cavity during battery pack testing and guides tracer gas to the detection assembly 8 via a flow guide tube, improving detection efficiency and raising the upper limit of leak detection, indirectly increasing the detection accuracy of the detection assembly 8. Compared to traditional testing methods, this device requires lower testing costs, achieves better results, and is simpler to operate and maintain.

[0056] The embodiment of the present invention generates negative pressure in the test cavity 5. This negative pressure environment can cause the mounting assembly to produce elastic deformation, further reducing the volume of the test cavity 5, thereby more tightly wrapping the workpiece 10 to be tested, thereby improving the accuracy and efficiency of the test.

[0057] The above are merely preferred embodiments of the present invention and the technical principles employed. The present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions that are apparent to those skilled in the art will not depart from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the claims.

Claims

1. A battery pack sealing test device, characterized in that: include: a mounting assembly, the mounting assembly comprising a first mounting assembly and a second mounting assembly, the first mounting assembly being provided with a first test cavity; the second mounting assembly being provided with a second test cavity, the second mounting assembly being further provided with a first through hole and a second through hole communicating with the second test cavity, the first mounting assembly being movably covered on the second mounting assembly so that the first test cavity and the second test cavity communicate with each other to form a test cavity; the test cavity being used to accommodate a workpiece to be tested; A vacuum pump assembly, the vacuum pump assembly includes a first vacuum pump and a second vacuum pump, the first connecting pipe of the first vacuum pump is connected to the test cavity through a first through hole to realize the vacuum operation of the test cavity; during the operation of the first vacuum pump, negative pressure is generated in the test cavity, causing the mounting assembly to produce elastic deformation to reduce the volume of the test cavity; the second connecting pipe of the second vacuum pump extends into the test cavity through the second through hole and is connected to the vent of the workpiece to be measured to realize the vacuum operation of the cavity of the workpiece to be measured.

2. The battery pack sealing test device according to claim 1, characterized in that: The first mounting assembly includes a movable frame, a connecting elastic member and a movable assembly; the movable frame is connected to the movable assembly through the connecting elastic member. During the operation of the first vacuum pump, negative pressure is generated in the test chamber, so that the connecting elastic member generates downward pressure on the movable assembly, so that the movable assembly abuts against the workpiece to be measured.

3. The battery pack sealing test device according to claim 2, characterized in that: The movable component is provided with a first diffusion structure, and the first diffusion structure is used to diffuse the tracer gas leaked from the workpiece to be tested into the test cavity.

4. The battery pack sealing test device according to claim 3, characterized in that: A second diffusion structure is provided in the second test cavity of the second mounting assembly; the second diffusion structure is used for diffusing the tracer gas leaked from the workpiece to be tested into the test cavity.

5. The battery pack sealing test device according to claim 4, characterized in that: The first diffusion structure and the second diffusion structure are also used to prevent the leakage position between the movable component and the workpiece to be measured from being blocked when the movable component and the workpiece to be measured are fitted together, so that the tracer gas cannot quickly reach the detection port.

6. The battery pack sealing test device according to claim 2, characterized in that: A first isolation valve is provided on the first connecting pipeline, and the first isolation valve is used to control the on-off of the first connecting pipeline. A second isolation valve is provided on the second connecting pipeline, and the second isolation valve is used to control the on-off of the second connecting pipeline.

7. The battery pack sealing test device according to claim 6, characterized in that: It also includes a third connecting pipeline and an inflation component connected to the third connecting pipeline. The third connecting pipeline is connected to the second connecting pipeline. A third isolation valve is provided on the third connecting pipeline. The inflation component is used to fill the workpiece to be measured with tracer gas.

8. The battery pack sealing test device according to claim 7, characterized in that: The testing device further comprises a detection component, which is used to detect tracer gas leaked from the testing cavity.

9. The battery pack sealing test device according to claim 2, characterized in that: The second mounting assembly is provided with a sealing ring, and when the first mounting assembly and the second mounting assembly are engaged, the sealing ring is used to seal the connection.

10. The battery pack sealing test device according to claim 1, characterized in that: The first installation component and the second installation component are both elastic members.

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