Air tightness detection device for battery shell
By fixing the battery casing with positioning posts and seals, and combining airflow channels and liquid observation methods, the problems of inaccurate leak location and high cost in existing technologies are solved, achieving low-cost and efficient battery casing airtightness testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EVE POWER CO LTD
- Filing Date
- 2025-04-28
- Publication Date
- 2026-05-01
AI Technical Summary
Existing helium mass spectrometry leak detectors cannot accurately locate leaks when testing the airtightness of battery casings, and the testing costs are high while the accuracy of the test results is low.
The battery casing is fixed with positioning posts and seals. A compressed air source is connected through an airflow channel, and observation liquid is injected into the observation hole to observe whether bubbles are formed in the liquid in order to determine the leak point.
It enables precise location of leaks in the battery casing, reduces testing costs, simplifies testing procedures, and improves testing efficiency.
Smart Images
Figure CN224189448U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery casing airtightness testing device. Background Technology
[0002] Leak detection equipment on the market can be broadly categorized into three types: positive pressure leak detectors, vacuum leak detectors, and helium mass spectrometry leak detectors. Among these, helium mass spectrometry leak detectors offer the highest accuracy and are widely used in products with stringent sealing requirements. Therefore, helium detectors are commonly used to test the airtightness of power battery top covers.
[0003] When using a helium detector for airtightness testing, the welded shell and top cover are first filled with helium, and then the pressure reading on the helium pipeline is used to determine if there is a leak. However, current technology can only confirm whether the welded shell and top cover are leaking, but cannot pinpoint the exact location of the leak. It also cannot rule out the influence of leaks from the top cover poles and explosion-proof valves on airtightness and pressure resistance testing, resulting in low accuracy. Furthermore, helium is relatively expensive, leading to high testing costs.
[0004] Therefore, there is an urgent need for a battery casing airtightness testing device to solve the above problems. Utility Model Content
[0005] The purpose of this invention is to provide a battery casing airtightness detection device, which can more accurately detect the location of leaks in the battery casing, and has low detection cost, simple detection steps, and is faster and more efficient.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] A battery casing airtightness testing device, comprising:
[0008] A positioning post is provided, on which the battery casing to be tested is placed. An airflow channel is provided inside the positioning post. One end of the airflow channel is used to connect to a compressed air source, and the other end penetrates the surface of the positioning post to form an air outlet. The air outlet is connected to the test position of the battery casing to be tested.
[0009] A sealing element is sandwiched between the positioning post and the battery casing to be tested, and the sealing element surrounds the periphery of the location to be tested;
[0010] An upper pressure plate is pressed against the end of the battery casing to be tested that is away from the positioning post. An observation through hole is opened through the upper pressure plate at the position to be tested, and the observation through hole is configured to be filled with observation liquid.
[0011] Optionally, a venting groove is formed on the upper surface of the positioning post, the vent is formed at the bottom of the venting groove, the battery casing to be tested is covered at the opening of the venting groove, and the projection of the position to be tested along the axial direction of the positioning post falls into the venting groove.
[0012] Optionally, a sealing groove is also provided on the upper surface of the positioning post. The sealing groove is annular, and the diameter of the inner ring of the sealing groove is larger than the diameter of the vent groove. The sealing element is disposed in the sealing groove.
[0013] Optionally, the airflow channel includes a first channel and a second channel that are connected to each other. The first channel and the second channel are arranged at an angle. The first channel is connected to the air outlet. The end of the second channel opposite to the first channel forms an air inlet on the side wall of the positioning column. The air inlet is connected to the compressed air source.
[0014] Optionally, the first channel is arranged parallel to the axial direction of the positioning post, and the second channel is arranged parallel to the radial direction of the positioning post.
[0015] Optionally, the diameter of the observation hole gradually increases along the direction away from the positioning post.
[0016] Optionally, it also includes a lower pad and a column, wherein the lower pad is fixed to the side of the positioning column opposite to the upper pressure plate, and the column is connected between the upper pressure plate and the lower pad, so that the upper pressure plate abuts against the battery casing to be tested.
[0017] Optionally, multiple columns are provided, and the multiple columns are symmetrically arranged on both sides of the positioning column.
[0018] Optionally, multiple columns are provided, and the multiple columns are spaced apart circumferentially along the positioning column.
[0019] Optionally, the liquid being observed is a transparent liquid.
[0020] The beneficial effects of this utility model are:
[0021] In the battery casing airtightness testing device provided by this utility model, a positioning post is used to fix the battery casing to be tested, thereby ensuring the stability of the battery casing during testing. An airflow channel is formed inside the positioning post. One end of the airflow channel is connected to a compressed air source, and the other end penetrates the surface of the positioning post to form an air outlet. The air outlet is connected to the test position of the battery casing. When the compressed air source supplies air into the airflow channel, it also supplies air to the test position simultaneously. A sealing element is sandwiched between the positioning post and the battery casing to be tested, surrounding the periphery of the test position. The sealing element ensures the airtightness between the positioning post and the battery casing to be tested, preventing gas leakage. An upper pressure plate is pressed against the end of the battery casing to be tested away from the positioning post. An observation through-hole is formed directly opposite the test position on the upper pressure plate, and the observation through-hole is configured to be filled with observation liquid. In other words, the upper pressure plate can press the battery casing to be tested against the positioning post. After compressed air is introduced, the leak point at the test position can be visually determined by detecting whether bubbles emerge from the observation liquid in the observation through-hole. The testing process does not require immersing the entire battery casing in liquid, and only compressed air is needed for testing. The testing cost is low, the steps are simple, and it is faster and more efficient. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the structure of the battery casing airtightness testing device provided in this embodiment of the utility model;
[0024] Figure 2 This is a top view of the battery casing airtightness testing device provided in this embodiment of the utility model;
[0025] Figure 3 This is a cross-sectional view of the positioning column provided in an embodiment of this utility model.
[0026] In the picture:
[0027] 100. Battery casing to be tested;
[0028] 1. Positioning post; 11. Airflow channel; 111. First channel; 112. Second channel; 12. Ventilation groove; 13. Air outlet; 14. Air inlet; 15. Sealing groove; 16. First connecting hole;
[0029] 2. Sealing components;
[0030] 3. Upper pressure plate; 31. Observation through hole; 32. Fifth connecting hole;
[0031] 4. Lower pad; 41. Second connecting hole; 42. Fourth connecting hole;
[0032] 5. Column; 51. Third connecting hole. Detailed Implementation
[0033] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0037] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0038] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0040] In the description of this utility model, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this utility model, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0042] This embodiment provides a battery casing airtightness detection device, which can be used to detect the airtightness of the battery casing and determine the location of leaks. Specifically, as shown... Figure 1 As shown, the battery casing airtightness testing device includes a positioning column 1, a sealing element 2, an upper pressure plate 3, a lower pad 4, and a column 5.
[0043] Reference Figure 1The battery casing 100 to be tested is mounted on the positioning post 1, which secures the battery casing 100 and ensures its stability during testing. An airflow channel 11 is formed within the positioning post 1. One end of the airflow channel 11 connects to a compressed air source, and the other end penetrates the surface of the positioning post 1 to form an outlet 13, which communicates with the test position of the battery casing 100. When the compressed air source supplies air into the airflow channel 11, it also supplies air to the test position simultaneously. A sealing element 2 is sandwiched between the positioning post 1 and the battery casing 100, surrounding the test position. The sealing element 2 ensures a tight seal between the positioning post 1 and the battery casing 100, preventing gas leakage. An upper pressure plate 3 abuts against the end of the battery casing 100 facing away from the positioning post 1. An observation through-hole 31 is formed through the upper pressure plate 3 opposite the test position, and the observation through-hole 31 is configured to be filled with an observation liquid. In this embodiment, the observation liquid is a transparent liquid, specifically water.
[0044] In other words, the upper pressure plate 3 can press the battery casing 100 to be tested against the positioning post 1. After compressed air is introduced, the leak point at the test location can be directly determined by checking whether bubbles emerge from the observation liquid in the observation hole 31. During the test, it is not necessary to immerse the entire battery casing 100 under test in liquid. It is only necessary to introduce compressed air into the airflow channel 11 and inject a small amount of water into the observation hole 31. Helium is not required, the test cost is low, the steps are simple, and the test process is faster and more efficient.
[0045] Specifically, such as Figure 1 and Figure 3 As shown, a venting groove 12 is formed on the upper surface of the positioning post 1, and an air outlet 13 is formed at the bottom of the venting groove 12. The battery casing 100 to be tested is placed over the opening of the venting groove 12, and the projection of the position to be tested along the axial direction of the positioning post 1 falls into the venting groove 12. That is, compressed air first flows into the venting groove 12 through the airflow channel 11, and the compressed air gathered in the venting groove 12 flows towards the battery casing 100 to be tested. If there is a leak in the battery casing 100 to be tested, the compressed air can flow out from the other side of the battery casing 100 to be tested through the leak, and then form bubbles in the observation liquid in the observation hole 31. The diameter of the venting groove 12 is larger than the diameter of the air outlet 13. The setting of the venting groove 12 can expand the detection range. As long as the position to be tested of the battery casing 100 to be tested is within the range of the opening of the venting groove 12, the airtightness of the position to be tested can be tested.
[0046] Understandably, during the airtightness test, it is necessary to ensure the seal between the positioning post 1 and the battery casing 100 under test to prevent compressed air from leaking out from the gap between the positioning post 1 and the battery casing 100 under test, thereby affecting the test results. Figure 1 and Figure 3 As shown, a sealing groove 15 is also formed on the upper surface of the positioning post 1. The sealing groove 15 is annular, and the diameter of the inner ring of the sealing groove 15 is larger than the diameter of the vent groove 12. The sealing element 2 is disposed within the sealing groove 15. When the battery casing 100 to be tested is pressed tightly against the positioning post 1, the battery casing 100 to be tested also presses against the sealing element 2, thereby ensuring the sealing between the upper surface of the positioning post 1 and the inner wall of the battery casing 100 to be tested. For example, the sealing element 2 can be a sealing ring.
[0047] Continue to refer to Figure 3 The airflow channel 11 includes a first channel 111 and a second channel 112 that are connected to each other. The first channel 111 and the second channel 112 are arranged at an angle. The first channel 111 is connected to the air outlet 13, and the end of the second channel 112 opposite to the first channel 111 forms an air inlet 14 on the side wall of the positioning post 1. The air inlet 14 is connected to a compressed air source. This arrangement, with the air inlet 14 located on the side wall of the positioning post 1, allows the compressed air source and the battery casing airtightness detection device to be placed side by side, facilitating operation.
[0048] Furthermore, the first channel 111 is arranged parallel to the axial direction of the positioning post 1, and the second channel 112 is arranged parallel to the radial direction of the positioning post 1. The first channel 111 and the second channel 112 are perpendicular to each other, which facilitates processing.
[0049] Continue to refer to Figure 1 Along the direction away from the positioning post 1, observe that the diameter of the through hole 31 gradually increases. This setting allows the operator to more intuitively see whether air bubbles are forming in the liquid and the specific location of the air bubbles, thereby accurately determining the location of the leakage point of the battery casing 100 under test.
[0050] Optionally, such as Figure 1 and Figure 2 As shown, the lower pad 4 is fixed to the positioning post 1 on the side away from the upper pressure plate 3, and the column 5 is connected between the upper pressure plate 3 and the lower pad 4 so that the upper pressure plate 3 presses against the battery casing 100 to be tested.
[0051] Specifically, a first connecting hole 16 is provided on the side of the positioning post 1 facing away from the upper pressure plate 3, and a corresponding second connecting hole 41 is provided on the lower pad 4. A first fastener passes through the second connecting hole 41 and is screwed into the first connecting hole 16, thereby fixing the positioning post 1 and the lower pad 4 together. It can be understood that the cross-sectional dimension of the lower pad 4 is larger than that of the positioning post 1, which helps to increase the contact area with the ground and ensure the stability of the battery casing airtightness testing device when placed.
[0052] More specifically, a third connecting hole 51 is provided at both the top and bottom ends of the column 5, a fourth connecting hole 42 is provided on the lower pad 4, and a fifth connecting hole 32 is provided on the upper pressure plate 3. The second fastener passes through the fourth connecting hole 42 and is screwed into the third connecting hole 51 at the bottom of the column 5, thus achieving a fixed connection between the lower pad 4 and the column 5. The third fastener passes through the fifth connecting hole 32 and is screwed into the third connecting hole 51 at the top of the column 5, thus achieving a fixed connection between the upper pressure plate 3 and the column 5. When the third fastener is tightened into the third connecting hole 51 at the top of the column 5, the upper pressure plate 3 presses against the upper surface of the battery casing 100 to be tested, thereby firmly fixing the battery casing 100 to the positioning post 1.
[0053] Optionally, multiple columns 5 are provided. In this embodiment, two columns 5 are provided, and the two columns 5 are symmetrically arranged on both sides of the positioning column 1, so that the upper pressure plate 3 is subjected to uniform force, thereby ensuring the uniformity of the pressure applied by the upper pressure plate 3 to the battery casing 100 to be tested.
[0054] In another embodiment, the columns 5 can also be set to three, four, or more, with multiple columns 5 arranged in a regular polygon around the axis of the positioning column 1, which can also ensure that the upper pressure plate 3 is subjected to uniform force. It should be noted that when the number of columns 5 is four, the four columns 5 can be arranged in a square array or in a rectangular array.
[0055] In another embodiment, multiple columns 5 are spaced apart circumferentially along the positioning column 1. That is, the multiple columns 5 are arranged in a circular array with the axis of the positioning column 1 as the center, which can also ensure that the upper pressure plate 3 is subjected to uniform force.
[0056] In this embodiment, the dimensions of the battery casing airtightness testing device are described using a φ46mm battery steel casing 100 as the test location and the positive terminal of the battery steel casing as an example. To fix the battery steel casing, a φ44.5mm, 130mm long positioning post 1 is used, allowing the battery steel casing to be fitted and fixed to the top of the positioning post 1. A blind hole φ8mm deep and 117.9mm deep is formed along the axial direction at the top of the positioning post 1, creating a first channel 111. Then, a rotating hole φ8.7mm deep and 25mm deep is formed along the radial direction, creating a second channel 112 for connecting a compressed air source. To ensure sealing, a sealing groove 15 with an inner diameter of φ30mm and a width of 4.5mm is formed at the top of the positioning post 1. The sealing ring has an outer diameter of φ35mm and a wire diameter of φ3mm. Of course, in other embodiments, the above numerical parameters can be designed according to the dimensions of the battery casing 100 and the test location; this embodiment will not elaborate on these details.
[0057] Understandably, to prevent the battery casing airtightness testing device from rusting during use, the entire device is made of aluminum-based composite material. This aluminum-based composite material uses aluminum or aluminum alloy as the base material, with a micro-arc oxidation layer and a ta-C thin film covering the surface. This material is prepared using micro-arc oxidation and physical vapor deposition techniques, and possesses advantages such as high hardness, wear resistance, and corrosion resistance.
[0058] The steps for using the battery casing airtightness testing device provided in this embodiment are as follows:
[0059] 1. Preliminary assembly: Fix the positioning column 1 on the lower pad 4, and install the column 5 on the lower pad 4;
[0060] 2. Sample preparation: Select the battery steel shell sample to be tested, place it on the positioning column 1, and put the sealing element 2 into the sealing groove 15 of the positioning column 1.
[0061] 3. Assembly of the device: Cover the battery steel shell with the upper pressure plate 3, connect the upper pressure plate 3 and the column 5, so that the upper pressure plate 3 presses the battery steel shell against the positioning column 1.
[0062] 4. Ventilation: Add about 10ml of water into the observation hole 31 to seal the positive terminal of the battery steel shell, and then introduce compressed air into the airflow channel 11.
[0063] 5. Measurement: Monitor and observe the water inside the through hole 31. If bubbles emerge, the battery steel shell is leaking. Observe the specific location of the gas leak.
[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A battery casing airtightness testing device, characterized in that, include: A positioning post (1) is provided, and the battery housing (100) to be tested is covered on the positioning post (1). An airflow channel (11) is opened in the positioning post (1). One end of the airflow channel (11) is used to connect to a compressed air source, and the other end penetrates the surface of the positioning post (1) and forms an air outlet (13). The air outlet (13) is connected to the test position of the battery housing (100) to be tested. A sealing element (2) is sandwiched between the positioning post (1) and the battery casing (100) to be tested, and the sealing element (2) surrounds the periphery of the position to be tested; The upper pressure plate (3) is pressed against the end of the battery casing (100) to be tested that is away from the positioning post (1). An observation through hole (31) is opened through the upper pressure plate (3) at the position to be tested, and the observation through hole (31) is configured to be filled with observation liquid.
2. The battery casing airtightness testing device according to claim 1, characterized in that, A ventilation groove (12) is provided on the upper surface of the positioning post (1), and an air outlet (13) is provided at the bottom of the ventilation groove (12). The battery casing (100) to be tested is covered at the opening of the ventilation groove (12), and the projection of the position to be tested along the axial direction of the positioning post (1) falls into the ventilation groove (12).
3. The battery casing airtightness testing device according to claim 2, characterized in that, The upper surface of the positioning post (1) is also provided with a sealing groove (15). The sealing groove (15) is annular, and the diameter of the inner ring of the sealing groove (15) is larger than the diameter of the vent groove (12). The sealing element (2) is disposed in the sealing groove (15).
4. The battery casing airtightness testing device according to claim 1, characterized in that, The airflow channel (11) includes a first channel (111) and a second channel (112) that are connected to each other. The first channel (111) and the second channel (112) are set at an angle. The first channel (111) is connected to the air outlet (13). The end of the second channel (112) away from the first channel (111) forms an air inlet (14) on the side wall of the positioning post (1). The air inlet (14) is connected to the compressed air source.
5. The battery casing airtightness testing device according to claim 4, characterized in that, The first channel (111) is arranged parallel to the axial direction of the positioning post (1), and the second channel (112) is arranged parallel to the radial direction of the positioning post (1).
6. The battery casing airtightness testing device according to claim 1, characterized in that, The diameter of the observation hole (31) gradually increases in the direction away from the positioning post (1).
7. The battery casing airtightness testing device according to any one of claims 1-6, characterized in that, It also includes a lower pad (4) and a column (5). The lower pad (4) is fixed to the side of the positioning column (1) away from the upper pressure plate (3). The column (5) is connected between the upper pressure plate (3) and the lower pad (4) so that the upper pressure plate (3) abuts against the battery casing (100) to be tested.
8. The battery casing airtightness testing device according to claim 7, characterized in that, Multiple columns (5) are provided, and the multiple columns (5) are symmetrically arranged on both sides of the positioning column (1).
9. The battery casing airtightness testing device according to claim 7, characterized in that, Multiple columns (5) are provided, and the multiple columns (5) are arranged at intervals along the circumference of the positioning column (1).
10. The battery casing airtightness testing device according to any one of claims 1-6, characterized in that, The liquid being observed is a transparent liquid.