A non-destructive battery leak detection tool

Abstract

The utility model relates to detection field, and specifically is a nondestructive battery leak detection tool, and the detection seat is provided with sealed detection cavity, and the detection cavity is installed with the locating seat for supporting the workpiece to be measured, and the locating seat surface is provided with the locating groove for accommodating the workpiece to be measured, and the workpiece to be measured will seal the slot of locating groove to make the groove cavity of locating groove form the sealed cavity independent in the detection cavity, and the workpiece injection port of workpiece to be measured is located in the sealed cavity, and the welding surface of workpiece to be measured is located outside the sealed cavity and exposes in the detection cavity, the sealed cavity communicates with leak detection joint, and the detection cavity communicates with helium filling joint. The utility model can avoid damaging the injection port of battery while guaranteeing the sealing detection precision.

Description

Technical Field

[0001] This utility model relates to the field of testing, specifically a non-destructive battery leak detection tool. Background Technology

[0002] As a core energy component, batteries are widely used in consumer electronics, new energy vehicles and other fields. Their main structure consists of a base and a cover plate: 1) The base is used to support the internal components of the battery cell, providing mechanical support and heat dissipation, and has an electrolyte filling port on its surface for electrolyte filling; 2) The cover plate is used to form a sealed cavity after being welded to the base, preventing electrolyte leakage and ensuring battery safety performance.

[0003] To ensure battery sealing, current battery sealing tests are typically conducted in stages: 1) Component pre-inspection: Independent sealing tests are performed on the base and cover plate separately to confirm the individual components are qualified; 2) Post-welding inspection: After the base and cover plate are welded and fixed, an overall sealing test (such as negative pressure test or helium test) is performed through the injection port, focusing on checking for leaks at the weld surfaces. However, in the post-welding inspection stage, a leak detection connector must be inserted into the injection port, and a clamp or sealing plug must be used to press the injection port to seal it.

[0004] Existing technologies that rely on clamps or sealing plugs to press the filling port into a seal have the following problems: 1) Mechanical pressure may cause the filling port to dent or deform, affecting subsequent electrolyte filling processes; 2) Deformation of the filling port may cause secondary leakage, reducing the reliability of the test; 3) Repairing damage to the filling port or replacing components further increases production costs. Therefore, how to avoid damage to the filling port while ensuring test accuracy has become a key problem that urgently needs to be solved in the field of battery sealing test. Utility Model Content

[0005] To avoid and overcome the technical problems existing in the prior art, this utility model provides a non-destructive battery leak detection fixture. This utility model ensures the accuracy of the seal detection while avoiding damage to the battery's filling port.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A non-destructive battery leak detection fixture includes a sealed detection chamber within the detection seat. A positioning seat for supporting the workpiece to be tested is installed within the detection chamber. The surface of the positioning seat has a positioning groove for accommodating the workpiece. The workpiece seals the opening of the positioning groove, forming a sealed cavity independent of the detection chamber. The workpiece's liquid injection port is located within the sealed cavity, while the welded surface of the workpiece is located outside the sealed cavity and exposed within the detection chamber. The sealed cavity is connected to a leak detection connector, and the detection chamber is connected to a helium filling connector.

[0008] As a further embodiment of this utility model: the workpiece to be tested includes a workpiece base and a workpiece cover plate welded and fixed to the workpiece base, and the workpiece liquid injection port of the workpiece to be tested is opened on the workpiece base; both the workpiece base and the workpiece cover plate are provided with outward flanges; the surface of the positioning seat is provided with an installation groove located on the outer ring of the positioning groove and used for installing the second sealing ring; the detection seat is provided with a pressure plate that applies downward pressure to the workpiece to be tested, and the pressure plate presses and fixes the outward flanges on the second sealing ring, the diameter of the second sealing ring being greater than the depth of the installation groove.

[0009] As a further improvement of this utility model: the detection seat is provided with a cavity cover that closes the opening of the detection cavity, and the cavity cover is driven to rise and fall by a vertical power source to close and seal the detection cavity.

[0010] As a further improvement of this utility model, the pressure plate is fixed at the bottom of the cavity cover and moves synchronously with the cavity cover.

[0011] As a further improvement of this utility model: a first sealing ring is provided at the contact surface between the cavity cover and the detection seat, and the first sealing ring is disposed on the outer ring of the detection cavity.

[0012] As a further improvement of this invention: a negative pressure suction nozzle for drawing in escaping helium gas is fixed at the end of the cavity cover away from the detection seat.

[0013] As a further improvement of this utility model: both the positioning seat and the detection seat are provided with corresponding leak detection holes, and the leak detection connector is connected to the sealing cavity through the leak detection holes; the positioning seat and the detection seat are sealed by a sealing ring, and the leak detection holes are located in the inner ring of the sealing ring.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model adopts an independent design separating the sealing cavity and the detection cavity. The welding surface is directly exposed in the detection cavity, and the liquid injection port of the workpiece to be tested is placed in the sealing cavity. Helium gas is introduced into the detection cavity on the outside of the workpiece through the helium filling connector. The liquid injection port of the workpiece to be tested is connected to the leak detection connector through the sealing cavity. When there is a leak, the helium gas in the detection cavity can enter the workpiece to be tested through the leak point and be detected by the leak detection connector through the liquid injection port of the workpiece to be tested. There is no need to use clamps or sealing plugs to directly compress the liquid injection port, thereby avoiding problems such as liquid injection port denting and deformation caused by traditional detection methods, ensuring the integrity of the workpiece structure, ensuring the accuracy of sealing detection, and avoiding damage to the liquid injection port of the battery.

[0016] 2. This utility model achieves a reliable seal between the workpiece to be tested and the positioning seat by cooperating with the pressure plate and the outward flange, combined with the elastic compression of the second sealing ring, thus preventing gas leakage from interfering with the results during the testing process; the first sealing ring is set between the cavity cover and the testing seat to ensure the overall airtightness of the testing cavity.

[0017] 3. The leak detection connector and helium filling connector of this utility model are integrated on the testing base. Through the cooperation of the positioning groove and the pressure plate, the workpiece to be tested can be quickly positioned and fixed, simplifying the operation process and improving the testing efficiency. The vertical power source drives the cavity cover to move up and down automatically, reducing manual intervention and making it suitable for batch testing. The negative pressure suction nozzle can actively absorb the small amount of helium gas that escapes from the testing cavity after the test is completed, so as to avoid affecting the next test.

[0018] 4. This utility model can be adapted to battery base and cover plate combinations of different specifications. By adjusting the size of the positioning groove or the specification of the sealing ring, it can meet diverse testing needs and reduce equipment modification costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0021] In the picture:

[0022] 1. Detection seat; 11. Helium filling connector; 12. First sealing ring; 13. Leak detection hole;

[0023] 2. Cavity cover; 21. Negative pressure suction nozzle;

[0024] 3. The workpiece to be tested; 31. The workpiece base; 32. The workpiece cover plate;

[0025] 311. Outward flange; 312. Workpiece liquid injection port;

[0026] 4. Pressure plate; 5. Leak detection connector; 6. Positioning seat;

[0027] 61. Sealing cavity; 62. Mounting groove; 63. Second sealing ring; 7. Detection cavity. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-2In this embodiment of the invention, a non-destructive battery leak detection fixture includes a detection seat 1 with a top opening, the opening of which forms a detection cavity 7. A cavity cover 2, hydraulically driven and lifted, is positioned above the detection seat 1. The cavity cover 2 closes the top opening of the detection seat 1, thus sealing the detection cavity 7. To improve sealing, a first sealing ring 12 is provided at the contact surface between the cavity cover 2 and the detection seat 1, and the first sealing ring 12 is positioned around the outer ring of the opening of the detection seat 1. Pressing down deforms the first sealing ring 12, thereby improving the sealing effect of the contact surface between the cavity cover 2 and the detection seat 1.

[0030] The detection seat 1 has a positioning seat 6 at the bottom of the detection cavity 7. Both the positioning seat 6 and the detection seat 1 have leak detection holes 13 at their axial centers. The two leak detection holes 13 are connected, and the leak detection holes 13 on the detection seat 1 are connected to the leak detection connector 5.

[0031] The positioning seat 6 and the detection seat 1 are fixed together by bolts. Each bolt is evenly arranged around the leak detection hole 13. The positioning seat 6 and the detection seat 1 are sealed by a sealing ring. The sealing ring is coaxial with the leak detection hole 13 and is located between the leak detection hole 13 and the bolts.

[0032] The positioning seat 6 has a positioning groove on one side of the adjacent cavity cover 2, and the workpiece 3 to be tested is fixed in the positioning groove. The workpiece 3 to be tested includes a workpiece base 31 and a workpiece cover plate 32 welded and fixed to the workpiece base 31. The workpiece liquid inlet 312 of the workpiece 3 to be tested is opened on the workpiece base 31. The outer ring of the workpiece base 31 and the workpiece cover plate are both provided with an outer flange 311, and the outer flange 311 of the workpiece base 31 and the workpiece cover plate 32 are welded and fixed.

[0033] A pressure plate 4 is fixed on one side of the cavity cover 2 adjacent to the positioning seat 6. The shape and position of the pressure plate 4 correspond to the outer flange 311 of the workpiece 3 to be tested. The pressure plate 4 moves up and down synchronously with the cavity cover 2 to press and fix the outer flange 311 of the workpiece 3 to be tested. After the workpiece 3 to be tested is pressed, the workpiece 3 to be tested seals the positioning groove cavity of the positioning seat 6, so that the positioning groove cavity forms a sealed cavity 61.

[0034] To improve the sealing performance of the sealing cavity 61, the surface of the positioning seat 6 is provided with an installation groove 61 arranged around the opening of the positioning groove. A second sealing ring 63 is installed in the installation groove 61. The diameter of the second sealing ring 63 is larger than the depth of the installation groove 61. After the workpiece 3 to be tested is pressed, there is still a gap between the pressure plate 4 and the positioning seat 6, allowing the welding surface of the workpiece 3 to communicate with the detection cavity 7. When the workpiece 3 to be tested is pressed, the outer flange 311 of the workpiece 3 to be tested abuts against and is positioned with the second sealing ring 63. Pressing down on the second sealing ring 63 deforms it, thereby completing the seal.

[0035] During testing, after the workpiece 3 is pressed and fixed, the testing chamber 7 is filled with helium through the helium filling connector 11. The workpiece liquid injection port 312 of the workpiece 3 is connected to the leak detection connector 5 through the sealing chamber 61 and the leak detection hole 13. When a leak point exists, the helium in the testing chamber 7 can enter the workpiece 3 through the leak point and be detected by the leak detection connector through the workpiece liquid injection port 312.

[0036] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0037] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

Claims

1. A non-destructive battery leak detection tool, comprising: The test seat (1) is provided with a sealed test chamber (7). The test chamber (7) is equipped with a positioning seat (6) for supporting the workpiece (3) to be tested. The surface of the positioning seat (6) is provided with a positioning groove for accommodating the workpiece (3) to be tested. The workpiece (3) to be tested seals the opening of the positioning groove so that the groove cavity forms a sealed cavity (61) independent of the test chamber (7). The workpiece injection port (312) of the workpiece (3) to be tested is located in the sealed cavity (61). The welding surface of the workpiece (3) to be tested is located outside the sealed cavity (61) and exposed in the test chamber (7). The sealed cavity (61) is connected to the leak detection connector (5), and the test chamber (7) is connected to the helium filling connector (11).

2. The non-destructive battery leak detection tool of claim 1, wherein, The workpiece to be tested (3) includes a workpiece base (31) and a workpiece cover plate (32) welded and fixed to the workpiece base (31). The workpiece liquid injection port (312) of the workpiece to be tested (3) is opened on the workpiece base (31). Both the workpiece base (31) and the workpiece cover plate (32) are provided with an outward flange (311). The surface of the positioning seat (6) is provided with an installation groove (62) located on the outer ring of the positioning groove and used to install the second sealing ring (63). The detection seat (1) is provided with a pressure plate (4) that applies downward pressure to the workpiece to be tested (3). The pressure plate (4) presses and fixes the outward flange (311) on the second sealing ring (63). The diameter of the second sealing ring (63) is greater than the depth of the installation groove (62).

3. The non-destructive battery leak detection tool of claim 2, wherein, The detection seat (1) is provided with a cavity cover (2) that closes the opening of the detection cavity (7). The cavity cover (2) is driven to rise and fall by a vertical power source to close and seal the detection cavity (7).

4. The non-destructive battery leak detection tool of claim 3, wherein, The pressure plate (4) is fixed to the bottom of the cavity cover (2) and moves synchronously with the cavity cover (2).

5. The non-destructive battery leak detection tool of claim 3, wherein, A first sealing ring (12) is provided at the contact surface between the cavity cover (2) and the detection seat (1), and the first sealing ring (12) is provided on the outer ring of the detection cavity (7).

6. The non-destructive battery leak detection tool of claim 3, wherein, The end of the cavity cover (2) away from the detection seat (1) is fixed with a negative pressure nozzle (21) for sucking up the escaping helium gas.

7. A non-destructive battery leak detection fixture according to any one of claims 1 to 6, characterized in that, Both the positioning seat (6) and the detection seat (1) are provided with corresponding leak detection holes (13). The leak detection connector (5) is connected to the sealing cavity (61) through the leak detection hole (13). The positioning seat (6) and the detection seat (1) are sealed by a sealing ring, and the leak detection hole (13) is located in the inner ring of the sealing ring.

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