Battery weld seam test fixture

Abstract

The utility model belongs to battery technical field discloses a kind of battery weld joint test tool, including bottom plate, clamping assembly and air-tight test component, clamping assembly includes first driving part, and first clamping plate and second clamping plate are set apart along first direction, first clamping plate is set on bottom plate, first driving part is connected with second clamping plate transmission, drives second clamping plate to move along first direction to clamp or loosen battery;Air-tight test component includes connecting pipe, pressure control system and air pressure measuring instrument, one end of connecting pipe is connected in the liquid injection hole of battery, the other end of connecting pipe is connected pressure control system, pressure control system can be filled with air or gas in battery, air pressure measuring instrument is provided on connecting pipe.The utility model battery weld joint test tool is monitored to the air pressure change in battery by air pressure measuring instrument, and records the pressure value before weld joint explosion, intuitively and accurately feedback the strength between cover plate and shell weld joint in battery charge-discharge cycle process.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery weld testing fixture. Background Technology

[0002] During battery manufacturing, the battery casing and cover are typically fixed together by welding, a crucial step in ensuring battery sealing and structural integrity. During actual charge-discharge cycles, the battery expands to some extent due to the lithium-ion insertion / extraction process on the internal electrodes or the gas production from the electrolyte oxidation and decomposition, resulting in a slightly bulging appearance on the battery surface. This physical change exerts additional tensile force on the weld between the cover and the casing, potentially affecting the weld integrity over time.

[0003] Currently, traditional methods for assessing the welding quality of the casing and cover plate mainly rely on the inspection of design parameters such as weld penetration and weld width. While this assessment method can preliminarily determine whether the technical parameters of the welding meet the standards, it cannot intuitively and accurately reflect the weld strength between the battery cover plate and the casing, making it difficult to accurately determine whether the battery and its system structure meet the long-term stability and safety requirements of the product. Utility Model Content

[0004] The purpose of this utility model is to provide a battery weld testing fixture with a simple structure, and its air pressure measuring instrument can intuitively and accurately reflect the actual bearing capacity of the weld between the battery cover and the shell.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery weld seam testing fixture is provided, including a base plate, a clamping assembly, and an airtightness testing assembly. The clamping assembly includes a first driving member and a first clamping plate and a second clamping plate spaced apart along a first direction. The first clamping plate is disposed on the base plate, and the first clamping plate and the second clamping plate are spaced apart to form a receiving space for clamping the battery. The first driving member is convexly connected to the second clamping plate, driving the second clamping plate to move along the first direction to clamp or release the battery. The airtightness testing assembly includes a connecting pipe, a pressure control system, and a pressure measuring instrument. One end of the connecting pipe is connected to the electrolyte injection port of the battery, and the other end of the connecting pipe is connected to the pressure control system. The pressure control system can charge or draw air into the battery. The pressure measuring instrument is disposed on the connecting pipe.

[0007] As a preferred embodiment of the battery weld seam testing fixture, the airtightness testing assembly further includes a mounting plate and a connector. The mounting plate is spaced apart on one side of the base plate along the second direction. The battery is located between the mounting plate and the base plate, and the injection hole is located on the side of the battery adjacent to the mounting plate. The connector is detachably connected to the mounting plate. One end of the connector is sealed to the injection hole, and the other end of the connector is detachably connected to the connecting pipe. The first direction is perpendicular to the second direction.

[0008] As a preferred embodiment of the battery weld seam testing fixture, the connector is a sealed connector, which includes a main body and an insertion part protruding from the main body. The main body is detachably connected to the mounting plate and abuts against the battery. The insertion part is inserted into the injection hole.

[0009] As a preferred embodiment of the battery weld testing fixture, the insertion part abuts against the wall of the injection hole.

[0010] As a preferred embodiment of the battery weld seam testing fixture, the airtightness testing assembly further includes a sealing sleeve, which is fitted over the connector and abuts against the battery and the mounting plate at both ends along its length.

[0011] As a preferred embodiment of the battery weld seam testing fixture, the clamping assembly further includes a displacement sensor, wherein the displacement sensor is provided on one of the first clamping plate and the second clamping plate, and the displacement sensor is used to detect the displacement change value of the other.

[0012] As a preferred embodiment of battery weld seam testing fixture, the first clamping plate is movable and disposed on the base plate along the first direction and can be selectively fixed.

[0013] As a preferred embodiment of the battery weld seam testing fixture, the clamping assembly further includes a support plate located between the first clamping plate and the second clamping plate, and the length of the support plate extends along a third direction. The support plate is movably disposed on the first clamping plate along a second direction and can be selectively fixed. The support plate is used to support the battery, and the first direction, the second direction and the third direction are perpendicular to each other.

[0014] As a preferred embodiment of the battery weld seam testing fixture, the battery weld seam testing fixture further includes a limiting component. The limiting component is respectively provided on both sides of the battery along the third direction. The limiting component includes a second driving member and a limiting plate. The second driving member is pulsatorically connected to the limiting plate so that the limiting plate can abut against the side of the battery along the third direction.

[0015] As a preferred embodiment of the battery weld seam testing fixture, the clamping assembly further includes a fixed plate and multiple guide shafts. The first clamping plate, the second clamping plate, and the fixed plate are arranged sequentially at intervals along the first direction. The fixed plate is connected to the first clamping plate through multiple guide shafts. The length of the guide shafts extends along the first direction. The second clamping plate is slidably disposed on the guide shafts. The first driving member is disposed on the fixed plate.

[0016] As a preferred embodiment of the battery weld seam testing fixture, the clamping assembly further includes a connecting plate and a pressure sensor. The connecting plate is slidably connected to the guide shaft and is located between the second clamping plate and the fixed plate. The pressure sensor is provided on one of the adjacent sides of the second clamping plate and the connecting plate. The first driving member is drivenly connected to the connecting plate, driving the connecting plate to abut against the second clamping plate through the pressure sensor.

[0017] The beneficial effects of this utility model are as follows: The first driving component moves the second clamping plate toward the first clamping plate to clamp the battery within the clamping assembly, simulating the tight-fitting state during the actual charge-discharge cycle of the battery. This also ensures the positional stability of the battery during testing, providing accurate data support for the battery weld testing and ensuring the reliability of the test results. In addition, the clamping assembly can also clamp batteries with different sizes along the first direction, effectively improving the compatibility of the battery weld testing fixture. By using a connecting pipe to connect the injection hole and the pressure control system, the pressure control system can inflate or draw air into the battery to simulate the expansion effect during the battery charge-discharge cycle, improving the realism of the simulation test. The air pressure measurement instrument monitors the changes in air pressure inside the battery and records the pressure value before the weld bursts, providing intuitive and accurate feedback on the strength of the weld between the cover plate and the shell during the battery charge-discharge cycle. This provides accurate and intuitive data for judging the stability and safety requirements of the battery, facilitating subsequent improvement and optimization of the weld quality. Furthermore, the connecting pipe is directly connected to the injection hole, eliminating the need for additional openings and avoiding structural damage that could affect the accuracy of the battery weld measurement data. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the battery weld seam testing fixture according to an embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional view of the battery weld seam testing fixture according to an embodiment of this utility model;

[0021] Figure 3 This is a right view of the battery weld seam testing fixture according to an embodiment of this utility model.

[0022] In the picture:

[0023] 100. Battery;

[0024] 1. Base plate; 2. Clamping assembly; 21. First driving component; 22. First clamping plate; 23. Second clamping plate; 24. Accommodation space; 25. Displacement sensor; 26. Fixing plate; 27. Guide shaft; 28. Connecting plate; 29. ​​Pressure sensor; 3. Air tightness testing assembly; 31. Connecting pipe; 32. Air pressure measuring instrument; 33. Mounting plate; 34. Connector; 35. Sealing sleeve; 36. Support rod. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] 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.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] like Figures 1 to 3 As shown, the battery weld seam testing fixture of this utility model embodiment includes a base plate 1, a clamping assembly 2, and an airtightness testing assembly 3. The clamping assembly 2 includes a first driving member 21 and a first clamping plate 22 and a second clamping plate 23 spaced apart along a first direction (the first direction is the X direction shown in the figure). The first clamping plate 22 is disposed on the base plate 1, and the first clamping plate 22 and the second clamping plate 23 are spaced apart to form a receiving space 24 for clamping the battery 100. The first driving member 21 is connected to the second clamping plate 23 in a transmission manner, and the first driving member 21 drives the second clamping plate 23 to move along the first direction to clamp or release the battery 100. The airtightness testing assembly 3 includes a connecting pipe 31, a pressure control system, and a pressure measuring instrument 32. One end of the connecting pipe 31 is connected to the liquid injection hole of the battery 100, and the other end of the connecting pipe 31 is connected to the pressure control system. The pressure control system can charge or draw air into the battery 100. The pressure measuring instrument 32 is disposed on the connecting pipe 31. The pressure control system can use a combination of an air pump and a control valve. The air pump is connected to a connecting pipe 31, and a control valve is installed on the connecting pipe 31 between the air pump and the air pressure measuring instrument 32.

[0030] Understandably, by driving the second clamping plate 23 toward the first clamping plate 22 through the first driving component 21, the battery 100 is clamped in the clamping assembly 2, simulating the clamping state of the battery 100 during the actual charge and discharge cycle. This also ensures the positional stability of the battery 100 during the test, provides accurate data support for the weld seam test of the battery 100, and ensures the reliability of the test results. In addition, the clamping assembly 2 can also clamp batteries 100 with different sizes along the first direction, effectively improving the compatibility of the battery weld seam test fixture.

[0031] By connecting the injection port and the pressure control system through the connecting pipe 31, the pressure control system can inflate or depress the battery 100 to simulate the expansion effect during the charge-discharge cycle of the battery 100, thus improving the realism of the simulation test. The pressure measuring instrument 32 monitors the pressure changes inside the battery 100 and records the pressure value before the weld bursts, providing a direct and accurate feedback on the strength of the weld between the cover plate and the shell during the charge-discharge cycle of the battery 100. This provides accurate and intuitive data for judging the stability and safety requirements of the battery 100, facilitating the improvement and optimization of the weld quality in the future. Furthermore, the connecting pipe 31 is directly connected to the injection port without the need for additional openings, avoiding structural damage that could affect the accuracy of the weld measurement data of the battery 100.

[0032] Furthermore, the airtightness testing assembly 3 also includes a mounting plate 33 and a connector 34. The mounting plate 33 is spaced apart on one side of the base plate 1 along the second direction (the second direction is the Z direction shown in the figure). The battery 100 is located between the mounting plate 33 and the base plate 1, and the liquid injection hole is located on the side of the battery 100 adjacent to the mounting plate 33. The connector 34 is detachably connected to the mounting plate 33. One end of the connector 34 is sealed to the liquid injection hole, and the other end of the connector 34 is detachably connected to the connecting pipe 31. The first direction is perpendicular to the second direction. In this embodiment, the mounting plate 33 is spaced apart on one side of the base plate 1 along the second direction by multiple support rods 36. The connector 34 is detachably connected to facilitate the disassembly, assembly, and maintenance of the connector 34. The connecting pipe 31 can be directly sleeved on the outer periphery of the connector 34 to achieve quick connection with the connector 34, making disassembly and assembly convenient.

[0033] For example, the mounting plate 33 is provided with a threaded hole through it along the second direction, and the outer periphery of the connector 34 is provided with a threaded section that mates with the threaded hole. By screwing the connector 34 into the threaded hole, the connector 34 is fixed to the mounting plate 33, which is convenient for connection and allows the height of the connector 34 to be adjusted along the second direction to improve the fitting accuracy between the connector 34 and the liquid injection hole of the battery 100.

[0034] Preferably, connector 34 is a sealed connector, comprising a main body and a protruding insertion portion. The main body is detachably connected to the mounting plate 33 and abuts against the battery 100, while the insertion portion is inserted into the injection hole. By using a sealing material with a certain compression sealing properties, the sealed connector can both achieve communication between the connecting pipe 31 and the injection hole of the battery 100 and ensure a tight seal when the sealed connector abuts against the battery 100. The insertion guide between the insertion portion and the injection hole effectively improves the connection accuracy between the sealed connector and the battery 100.

[0035] Furthermore, the connector abuts against the wall of the injection hole. Based on the main body abutting against the surface of the battery 100, the abutment between the connector and the wall of the injection hole further enhances the sealing area between the sealing connector and the battery 100, improving the sealing performance of the connection and reducing leakage of internal air pressure in the battery 100, thus ensuring the accuracy of battery 100 testing.

[0036] Optionally, such as Figure 1 and Figure 2 As shown, the airtightness testing assembly 3 also includes a sealing sleeve 35, which is fitted over the connector 34, and its two ends along its length abut against the battery 100 and the mounting plate 33 respectively. The sealing sleeve 35 further enhances the sealing performance between the connector 34 and the liquid injection hole between the battery 100 and the mounting plate 33, reducing the leakage of air pressure inside the battery 100.

[0037] In some embodiments, the clamping assembly 2 further includes a displacement sensor 25. One of the first clamping plate 22 and the second clamping plate 23 is provided with the displacement sensor 25, which is used to detect the displacement change value of the other. For example, the first clamping plate 22 is provided with the displacement sensor 25, which is used to detect the movement change of the second clamping plate 23, that is, the change in distance between the second clamping plate 23 and the first clamping plate 22, thereby providing feedback on the expansion change of the casing during the simulated test of the battery 100, and providing effective data support for the weld seam test of the battery 100.

[0038] Furthermore, the first clamping plate 22 is movably mounted on the base plate 1 along the first direction and can be selectively fixed. Since there are batteries 100 with different sizes along the first direction, the liquid injection holes of different batteries 100 and the connectors 34 may be misaligned along the first direction. Therefore, by movably mounting the first clamping plate 22, when batteries 100 with different sizes along the first direction are connected to the connectors 34, the first clamping plate 22 can still provide positioning support, so as to be compatible with the testing of batteries 100 with different sizes along the first direction and improve the versatility of the battery weld testing fixture.

[0039] Furthermore, the clamping assembly 2 also includes a support plate located between the first clamping plate 22 and the second clamping plate 23. The length of the support plate extends along a third direction (the third direction is the Y direction shown in the figure). The support plate is movably mounted on the first clamping plate 22 along a second direction and can be selectively fixed. The support plate is used to support the battery 100, and the first, second, and third directions are perpendicular to each other. By supporting the battery 100 with the support plate, the battery 100 can be supported between the fixing plate 26 and the support plate along the second direction, ensuring the sealing of the connection between the connector 34 and the battery 100. At the same time, by moving and adjusting the position of the support plate along the second direction, it can be adapted to simulated tests of batteries 100 with different dimensions in the second direction, improving the compatibility of the battery weld testing fixture.

[0040] For example, a waist-shaped hole is provided through the first clamping plate 22 along the first direction, and the length of the waist-shaped hole extends along the second direction. A threaded hole is provided on the support plate. After the support plate is moved and adjusted along the second direction, the bolt passes through the waist-shaped hole and is screwed into the threaded hole to realize the fixation of the support plate and the first clamping plate 22, and to facilitate connection and adjustment.

[0041] Optionally, the battery weld seam testing fixture also includes limiting components. Limiting components are respectively provided on both sides of the battery 100 along a third direction. Each limiting component includes a second driving member and a limiting plate. The second driving member is kinetically connected to the limiting plate so that the limiting plate can abut against the side of the battery 100 along the third direction. In this embodiment, the second driving member is disposed on one side of the battery 100 along the third direction via a placement plate. By using two second driving members to drive the limiting plate to abut against the battery 100, the placement stability of the battery 100 is further improved, and the offset of the battery 100 along the third direction is reduced.

[0042] Preferably, the limiting plate is the same size as the side of the battery 100 housing along the third direction, that is, the limiting plate completely covers the side of the housing along the third direction. The support plate is the same size as the bottom surface of the housing and covers the bottom surface of the battery 100. The first clamping plate 22 and the second clamping plate 23 cover the two sides of the housing along the first direction. The bottom and peripheral sides of the battery 100 housing are abutted and restricted. The cover plate of the battery 100 is pressed by the connector 34, so that only the weld of the battery 100 is exposed, so as to improve the significance of weld deformation in the charge and discharge gas expansion test.

[0043] In other embodiments, such as Figure 1 and Figure 3 As shown, the clamping assembly 2 also includes a fixed plate 26 and multiple guide shafts 27. The first clamping plate 22, the second clamping plate 23, and the fixed plate 26 are arranged sequentially at intervals along a first direction. The fixed plate 26 is connected to the first clamping plate 22 through multiple guide shafts 27. The length of the guide shafts 27 extends along the first direction. The second clamping plate 23 is slidably disposed on the guide shafts 27. The first driving member 21 is disposed on the fixed plate 26. The arrangement of the guide shafts 27 effectively enhances the movement guidance and movement stability of the second clamping plate 23. In addition, both the first driving member 21 and the second driving member can be one of a cylinder, a hydraulic cylinder, or a linear motor module, etc. In this embodiment, the first driving member 21 adopts a lead screw assembly, and the movement of the second clamping plate 23 is controlled by manually rotating the lead screw. The second driving member can also adopt a lead screw assembly.

[0044] Furthermore, the clamping assembly 2 also includes a connecting plate 28 and a pressure sensor 29. The connecting plate 28 is slidably connected to the guide shaft 27 and is located between the second clamping plate 23 and the fixed plate 26. The pressure sensor 29 is provided on one of the adjacent sides of the second clamping plate 23 and the connecting plate 28. The first driving member 21 is driven to the connecting plate 28, and the first driving member 21 drives the connecting plate 28 to abut against the second clamping plate 23 through the pressure sensor 29. The pressure sensor 29 is used to detect the change in air pressure inside the battery 100 in real time. At the same time, the displacement sensor 25 detects the expansion change of the battery 100 through the displacement of the second clamping plate 23. The pressure sensor 29 is then used to detect the degree of expansion stress of the battery 100 under different conditions, providing multiple data supports for evaluating the performance of the weld under different conditions.

[0045] 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 various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments 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 weld seam testing fixture, characterized in that, include: Base plate; A clamping assembly includes a first driving member and a first clamping plate and a second clamping plate spaced apart along a first direction. The first clamping plate is disposed on the base plate, and the first clamping plate and the second clamping plate are spaced apart to form a receiving space for clamping the battery. The first driving member is convexly connected to the second clamping plate and drives the second clamping plate to move along the first direction to clamp or release the battery. An airtightness testing assembly includes a connecting tube, a pressure control system, and a pressure measuring instrument. One end of the connecting tube is connected to the electrolyte filling port of the battery, and the other end of the connecting tube is connected to the pressure control system. The pressure control system is capable of filling or drawing air into the battery. The pressure measuring instrument is installed on the connecting tube.

2. The battery weld testing fixture according to claim 1, characterized in that, The airtightness testing assembly further includes a mounting plate and a connector. The mounting plate is spaced apart on one side of the base plate along the second direction. The battery is located between the mounting plate and the base plate, and the liquid injection hole is located on the side of the battery adjacent to the mounting plate. The connector is detachably connected to the mounting plate. One end of the connector is sealed to the liquid injection hole, and the other end of the connector is detachably connected to the connecting tube. The first direction is perpendicular to the second direction.

3. The battery weld seam testing fixture according to claim 2, characterized in that, The connector is a sealed connector, which includes a main body and a plug portion protruding from the main body. The main body is detachably connected to the mounting plate and abuts against the battery. The plug portion is inserted into the injection hole.

4. The battery weld testing fixture according to claim 3, characterized in that, The insertion part abuts against the wall of the injection hole.

5. The battery weld testing fixture according to claim 2, characterized in that, The airtightness testing assembly also includes a sealing sleeve, which is fitted over the connector and abuts against the battery and the mounting plate at both ends along its length.

6. The battery weld testing fixture according to any one of claims 1-5, characterized in that, The clamping assembly further includes a displacement sensor, which is provided on one of the first clamping plate and the second clamping plate, and is used to detect the displacement change value of the other.

7. The battery weld testing fixture according to any one of claims 1-5, characterized in that, The first clamping plate is movable and disposed on the base plate along the first direction and can be selectively fixed.

8. The battery weld testing fixture according to any one of claims 1-5, characterized in that, The clamping assembly further includes a support plate located between the first clamping plate and the second clamping plate, and the length of the support plate extends along a third direction. The support plate is movably disposed on the first clamping plate along a second direction and can be selectively fixed. The support plate is used to support the battery, and the first direction, the second direction and the third direction are perpendicular to each other.

9. The battery weld testing fixture according to claim 8, characterized in that, It also includes limiting components, with the limiting components respectively provided on both sides of the battery along the third direction. The limiting components include a second driving member and a limiting plate. The second driving member is convexly connected to the limiting plate so that the limiting plate can abut against the side of the battery along the third direction.

10. The battery weld testing fixture according to any one of claims 1-5, characterized in that, The clamping assembly further includes a fixed plate and multiple guide shafts. The first clamping plate, the second clamping plate, and the fixed plate are arranged sequentially at intervals along the first direction. The fixed plate is connected to the first clamping plate through multiple guide shafts. The length of the guide shafts extends along the first direction. The second clamping plate is slidably disposed on the guide shafts. The first driving member is disposed on the fixed plate.

11. The battery weld testing fixture according to claim 10, characterized in that, The clamping assembly further includes a connecting plate and a pressure sensor. The connecting plate is slidably connected to the guide shaft and is located between the second clamping plate and the fixed plate. The pressure sensor is provided on one of the adjacent sides of the second clamping plate and the connecting plate. The first driving member is drivenly connected to the connecting plate and drives the connecting plate to abut against the second clamping plate through the pressure sensor.

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