A dual-pressure testing device for lithium battery casing

Abstract

This application discloses a dual-pressure testing device for lithium battery casings, belonging to the technical field of lithium battery casing testing equipment. It mainly includes: a test casing, a pressure application component installed inside the test casing, the pressure application component including a middle plate located inside the test casing, the middle plate being driven by a power source and capable of moving up and down within the test casing, and a limiting component installed below the middle plate, the limiting component including two positioning plates mounted on the middle plate, each positioning plate having two slide rails fixed to it, and a pressure plate sliding on the slide rails. This dual-pressure testing device for lithium battery casings, through the arrangement of the pressure application component, limiting component, positioning component, and quick-release component within the test casing, achieves efficient replacement and positioning of the pressure plate, solving the problems of high difficulty and low efficiency in pressure plate replacement in existing devices. It can test lithium battery casings of various specifications, improving testing efficiency and accuracy.

Description

Technical Field

[0001] This application relates to the technical field of lithium battery casing testing equipment, specifically a lithium battery casing dual-pressure testing device. Background Technology

[0002] As a key protective structure for the battery cell, the lithium battery casing must withstand pressure impacts under complex operating conditions such as vehicle bumps and internal thermal runaway gas expansion. Its pressure resistance directly affects the safety of the battery system and even the entire vehicle. To test this performance, two types of tests are required: one is the burst pressure test (also called the gas burst test), which involves impacting the aluminum casing with high-pressure gas at a pressure of 1-3.5 MPa, causing the aluminum casing to burst. The strength of the aluminum casing is assessed by observing the damage to the battery cell casing. The other is the pressure resistance test (also called the gas pressure resistance test), which typically involves impacting the aluminum casing with high-pressure gas at a pressure of 1.2 MPa. If the aluminum casing does not burst, the pressure resistance of the aluminum casing is assessed by observing the expansion of the battery cell casing.

[0003] In the process of using a dual-pressure testing device for lithium battery casings, it is usually necessary to test battery casings of different specifications in sequence. Different tooling accessories need to be replaced for battery casings of different sizes. However, in some existing dual-pressure testing devices for lithium battery casings, the pressure plate is mostly fixed to the intermediate plate by bolts. When replacing with a larger pressure plate, the operator has to overcome the heavy weight of the pressure plate itself while aligning the bolt holes in sequence, which makes the operation difficult and inefficient. Therefore, it is necessary to provide a dual-pressure testing device for lithium battery casings to solve the above problems.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0005] Based on the above-mentioned problems in the existing technology, the problem to be solved by this application is to provide a lithium battery casing dual-pressure testing device, which solves the problem of high operation difficulty and low efficiency when changing pressure plates of different sizes in the existing lithium battery casing dual-pressure testing device, because the bolt fixing requires overcoming the weight of the pressure plate and aligning the bolt holes.

[0006] The technical solution adopted by this application to solve its technical problem is: a lithium battery casing dual-pressure testing device, comprising: Test housing; A pressure application assembly is installed inside a test housing. The pressure application assembly includes an intermediate plate located inside the test housing. The intermediate plate is driven by a power source and can move up and down inside the test housing. A limiting component is installed below the middle plate. The limiting component includes two positioning plates installed on the middle plate. Two slide rails are fixed on the positioning plates respectively, and a pressure plate slides on the slide rails. A positioning assembly, mounted on an intermediate plate, includes a bidirectional lead screw rotatably connected to the intermediate plate. Two bidirectional sliders are fitted onto the shaft of the lead screw. Each bidirectional slider has an L-shaped bracket mounted on its lower part. A positioning frame is mounted on the lower end of each L-shaped bracket. Two limiting grooves are provided at both ends of the pressure plate. Each limiting groove contains a first positioning hole. Each slide rail has a second positioning hole. The positioning frame passes through the limiting groove and the first positioning hole, and is inserted into the second positioning hole. A quick-release assembly, mounted within the positioning plate, is suitable for positioning the pressure plate.

[0007] Furthermore, a workbench is installed inside the test housing, a guide rod is installed on the workbench, an assembly plate is installed on the guide rod, an electric push rod is installed on the assembly plate, and the output end of the electric push rod is connected to the intermediate plate.

[0008] Furthermore, the positioning component also includes a servo motor mounted on the intermediate plate, the output end of which is coaxially connected to one end of the bidirectional lead screw.

[0009] Furthermore, the quick-installation assembly includes an assembly slot formed on the positioning plate, two sets of springs are fixed in the assembly slot, one end of each spring is fitted with a transition plate that can slide along the assembly slot, the transition plate is fitted with an arc-shaped protrusion that can extend outside the assembly slot, and the pressure plate is respectively provided with arc-shaped grooves that can be adapted to the arc-shaped protrusions.

[0010] Furthermore, the spring causes the arc-shaped protrusion to maintain its tendency to move toward the arc-shaped groove.

[0011] Furthermore, the positioning plates are symmetrically distributed on the intermediate plate.

[0012] Furthermore, the L-shaped bracket is made of aluminum alloy.

[0013] The beneficial effects of this application are: The lithium battery casing dual-pressure testing device provided by this application achieves efficient replacement and positioning of the pressure plate by setting up the pressure application component, limiting component, positioning component and quick-release component in the test casing, which solves the problems of high difficulty and low efficiency in the operation of the existing device for replacing the pressure plate. It can test lithium battery casings of different specifications and improve the testing efficiency and accuracy.

[0014] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 is a first perspective structural schematic diagram of a lithium battery casing dual-pressure testing device according to an embodiment of this application; Figure 2 is a second perspective structural schematic diagram of a lithium battery casing dual-pressure testing device according to an embodiment of this application; Figure 3 is a three-dimensional structural schematic diagram of the pressure application component according to an embodiment of this application; Figure 4 is a three-dimensional structural schematic diagram of the pressure application component and the limiting component according to an embodiment of this application; Figure 5 is a three-dimensional structural diagram of the limiting component and the positioning component according to an embodiment of this application; Figure 6 is a partial three-dimensional structural schematic diagram of the limiting component according to an embodiment of this application; Figure 7 is a three-dimensional structural schematic diagram of the pressure plate according to an embodiment of this application; Figure 8 is a three-dimensional structural diagram of the positioning plate according to an embodiment of this application; Figure 9 is a three-dimensional structural diagram of the quick-installation component according to an embodiment of this application.

[0016] The following are the labeling elements in the figure: 1. Test housing; 11. Workbench; 12. Fixing mold; 13. Operating port; 14. Operating window; 2. Pressure application assembly; 21. Guide rod; 22. Assembly plate; 23. Electric push rod; 24. Intermediate plate; 3. Limiting assembly; 31. Positioning plate; 32. Slide rail; 33. Pressure plate; 34. Slide groove; 35. Limiting groove; 36. First positioning hole; 37. Second positioning hole; 4. Positioning assembly; 41. Servo motor; 42. Bidirectional lead screw; 43. Bidirectional slider; 44. L-shaped bracket; 45. Positioning frame; 46. Intermediate frame; 47. Guide sleeve; 48. Guide frame; 5. Quick-release assembly; 51. Assembly groove; 52. Spring; 53. Adapter plate; 54. Arc-shaped protrusion; 55. Arc-shaped groove. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0019] As shown in Figure 1, this application provides a lithium battery casing dual-pressure testing device, including a test casing 1. The test casing 1 is the main frame of the lithium battery casing dual-pressure testing device, providing installation support for the internal components and forming a relatively closed testing space to protect the testing process from external interference and ensure the safety of operators. A workbench 11 is fixed at the bottom of the test casing 1, and a fixing mold 12 is installed on the workbench 11 by bolts. The workbench 11 serves as the basic platform for testing, providing a stable mounting base for the fixing mold 12 and other components. At the same time, the fixing mold 12 is used to position the lithium battery casing to be tested, preventing the casing from shifting during the inflation test and causing air leakage, and ensuring that the pressure is applied evenly to the casing surface. An operation port 13 is provided at one end of the test housing 1. The operation port 13 facilitates the operator to put the lithium battery housing to be tested into or take out the test device. An operation window 14 is hinged to one side of the test housing 1. The operation window 14 is transparent and can be opened or closed to observe the test process. At the same time, opening the operation window 14 makes it easy for the staff to replace the components inside the test housing 1.

[0020] like Figures 2-4 As shown, a pressure application component 2 is installed inside the test housing 1. The pressure application component 2 ensures the direction and force of pressure application through motion control, providing a stable pressure output for the battery housing test process, so that the battery housing is not easily subjected to uneven force or leaks during the burst pressure test or withstand pressure test. The pressure application component 2 includes a guide rod 21 fixed at the corner of the worktable 11. The guide rod 21 is made of stainless steel and the surface is chrome-plated to reduce the coefficient of friction. An assembly plate 22 is fixed on the guide rod 21, and an electric push rod 23 is installed on the assembly plate 22. The output end of the electric push rod 23 extends to the bottom of the assembly plate 22 and an intermediate plate 24 is installed by bolts. The electric push rod 23 is started by an external power supply and a corresponding controller. The output end of the electric push rod 23 moves axially, thereby driving the intermediate plate 24 to move up and down along the axis of the guide rod 21. During this movement, the guide rod 21 ensures the movement trajectory of the intermediate plate 24 and reduces the occurrence of pressure direction deviation caused by the shaking of the intermediate plate 24. like Figures 4-8 As shown, a limiting component 3 is installed below the middle plate 24. The limiting component 3 enables rapid adaptation to lithium battery casings of different specifications. The limiting component 3 includes two positioning plates 31 fixed on the middle plate 24. The positioning plates 31 are symmetrically distributed on the middle plate 24 and provide an installation base for the limiting component 3. Two slide rails 32 are fixed on the positioning plate 31. A pressure plate 33 is slidably connected to the slide rails 32. The pressure plate 33 moves up or down synchronously with the intermediate plate 24 and contacts the upper part of the battery casing to apply pressure to the battery casing, so that the battery casing is not easy to tilt or leak air during the test. The pressure plate 33 is provided with a sliding groove 34 that matches the slide rail 32. When disassembling, the operator can pull out the pressure plate 33 laterally along the slide rail 32 without removing the bolts, and support the pressure plate 33 with their arm to reduce the difficulty of operation.

[0021] like Figure 3 and Figure 5 As shown, a positioning component 4 is installed on the intermediate plate 24. The positioning component 4 enables quick positioning and unlocking of the pressure plate 33 to adapt to the testing requirements of lithium battery casings of different specifications. The positioning component 4 includes a servo motor 41 that is bolted to the upper part of the intermediate plate 24. Before use, the servo motor 41 needs to be connected to an external power supply and operated by a corresponding controller. A bidirectional lead screw 42 is coaxially installed at the output end of the servo motor 41. The bidirectional lead screw 42 is connected to the output end of the servo motor 41 through a coupling. Two bidirectional sliders 43 are threadedly connected to the rod body of the bidirectional lead screw 42. An L-shaped bracket 44 is fixed at the lower part of each bidirectional slider 43. The L-shaped bracket 44 is made of aluminum alloy and moves synchronously with the bidirectional slider 43. The lower end of each L-shaped bracket 44 passes through the intermediate plate 24 and is equipped with a positioning frame 45. The positioning frame 45 can move laterally with the L-shaped bracket 44. The servo motor 41 is started by an external power supply and a corresponding controller, so that the servo motor 41 provides power to the entire positioning assembly 4. Its output end drives the bidirectional lead screw 42 to rotate through a coupling. When the bidirectional lead screw 42 rotates, it drives the two bidirectional sliders 43 to move in opposite directions along the rod body through the thread structure, thereby driving the L-shaped bracket 44 to move laterally, realizing the control of the position of the positioning frame 45, so as to complete the locking or unlocking operation of the pressure plate 33. When locking the pressure plate 33, it ensures that the pressure plate 33 remains fixed during the test, and when unlocking the pressure plate 33, it is easy to disassemble and replace. The intermediate plate 24 is provided with a sliding hole (not shown in the figure) that is adapted to the L-shaped bracket 44, which is suitable for the L-shaped bracket 44 to move laterally on the intermediate plate 24. The sliding hole provides a guide channel for the L-shaped bracket 44 to move laterally, ensuring the accuracy of its movement trajectory. Two limiting grooves 35 are provided at both ends of the pressure plate 33. The limiting grooves 35 provide an insertion guide for the positioning frame 45. A first positioning hole 36 communicating with the slide groove 34 is provided in each limiting groove 35. A second positioning hole 37 corresponding to the first positioning hole 36 is provided on each slide rail 32. The first positioning hole 36 and the second positioning hole 37 are aligned to provide an insertion path for the positioning frame 45 and realize the locking of the pressure plate 33 and the slide rail 32. The ends of the positioning frame 45 that are far apart from each other pass through the limiting groove 35 and the first positioning hole 36 respectively and are inserted into the second positioning hole 37, which is suitable for limiting the position of the pressure plate 33. An intermediate frame 46 is fixed at the lower end of each L-shaped bracket 44. A guide sleeve 47 is fixed at the end of the intermediate frame 46 away from the L-shaped bracket 44. The guide sleeve 47 has a sleeve-like structure. One end of the guide sleeve 47 is fixedly connected to the positioning frame 45 at the corresponding position. A guide frame 48 that is adapted to the two guide sleeves 47 is fixed at the bottom of the intermediate plate 24. The two guide sleeves 47 are respectively sleeved on both ends of the guide frame 48. The guide frame 48 serves as a support track for the guide sleeve 47, guiding the movement direction of the guide sleeve 47 and improving the stability of the L-shaped bracket 44 and the positioning frame 45 during movement. like Figure 7 and Figure 9As shown, a quick-release assembly 5 is installed inside the positioning plate 31. This quick-release assembly 5 can quickly position the pressure plate 33, aligning the pressure plate 33 with the center of the positioning plate 31. This ensures that the positioning frame 45 can be inserted into the first positioning hole 36 and the second positioning hole 37 through the limiting groove 35, thereby locking the position of the pressure plate 33. The quick-release assembly 5 includes an assembly groove 51 located in the center of the positioning plate 31. The assembly groove 51 provides space for the internal parts of the quick-release assembly 5. At least two sets of springs 52 are fixed inside the assembly groove 51. These springs 52 are compression springs that undergo elastic deformation when subjected to axial pressure and return to their original shape after release. They have a cylindrical spiral structure. A transition plate 53 that can slide along the assembly groove 51 is fixed to one end of the spring 52. An arc-shaped protrusion 54 that can extend outside the assembly groove 51 is fixed on the transition plate 53. The pressure plate 33 is provided with arc-shaped protrusions 54 that can interact with the arc-shaped protrusions 54. The arc-shaped groove 55 is adapted to match the inner contour of the arc-shaped protrusion 54. When the center position of the pressure plate 33 coincides with the center position of the positioning plate 31, the arc-shaped protrusion 54 is inserted into the arc-shaped groove 55 under the pushing force of the spring 52, forming a radial locking structure, which makes it easier for the staff to quickly position the pressure plate 33.

[0022] When disassembling the pressure plate 33, simply pull the pressure plate 33 horizontally. The arc-shaped protrusion 54 is squeezed by the pressure plate 33 and compresses the spring 52, causing the arc-shaped protrusion 54 to disengage from the arc-shaped groove 55. This allows for tool-free disassembly and improves the efficiency of pressure plate 33 replacement.

[0023] Working principle: When replacing the pressure plate 33, this device is pulled laterally along the slide rail 32. At this time, the arc groove 55 on the pressure plate 33 and the arc protrusion 54 in the positioning plate 31 are relatively displaced. The arc protrusion 54 is squeezed inward by the pressure plate 33, compressing the spring 52 in the assembly groove 51. When the arc protrusion 54 is completely disengaged from the arc groove 55, the pressure plate 33 can be pulled out laterally along the slide rail 32 to complete the disassembly. When installing the new pressure plate 33, the pressure plate 33 is pushed in along the slide rail 32. When the center position of the pressure plate 33 is aligned with the center position of the positioning plate 31, the spring 52 pushes the adapter plate 53 due to the elastic deformation, so that the arc protrusion 54 is embedded in the arc groove 55 of the pressure plate 33. The radial engagement structure between the arc protrusion 54 and the arc groove 55 completes the rapid positioning of the pressure plate 33. Then, the servo motor 41 is started by an external power supply and a corresponding controller. The output shaft of the servo motor 41 drives the bidirectional lead screw 42 to rotate through a coupling. Since the threads at both ends of the bidirectional lead screw 42 rotate in opposite directions, the two bidirectional sliders 43 move in opposite directions along the rod under the action of thread transmission, thereby driving the L-shaped bracket 44 to move laterally, so that the positioning frame 45 moves towards the pressure plate 33. When the positioning frame 45 moves to both ends of the pressure plate 33, its end passes through the limiting groove 35 and the first positioning hole 36 in sequence, and is precisely inserted into the second positioning hole 37 of the slide rail 32. The mechanical locking structure is formed by the cooperation of the positioning frame 45 and the positioning hole to ensure that the pressure plate 33 remains fixed during the test. During testing, the output end of the electric push rod 23 extends and retracts after being powered on, causing the intermediate plate 24 to move up and down along the guide rod 21, so that the pressure plate 33 applies pressure to the lithium battery casing, ensuring that the battery casing is not easily shaken or tilted during the test, and that the test gas inside the battery casing is not easily leaked, thus ensuring the accuracy of the test data.

[0024] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-pressure testing device for lithium battery casings, characterized in that: include: Test housing (1); A pressure application assembly (2) is installed inside the test housing (1). The pressure application assembly (2) includes an intermediate plate (24) located inside the test housing (1). The intermediate plate (24) is driven by power and can move up and down inside the test housing (1). The limiting component (3) is installed below the middle plate (24). The limiting component (3) includes two positioning plates (31) installed on the middle plate (24). Two slide rails (32) are fixed on the positioning plates (31) respectively, and pressure plates (33) slide on the slide rails (32). The positioning component (4) is mounted on the intermediate plate (24). The positioning component (4) includes a bidirectional lead screw (42) rotatably connected to the intermediate plate (24). The body of the bidirectional lead screw (42) is fitted with two bidirectional sliders (43). The lower part of each bidirectional slider (43) is fitted with an L-shaped bracket (44). The lower end of the L-shaped bracket (44) is fitted with a positioning frame (45). The two ends of the pressure plate (33) are respectively provided with two limiting grooves (35). Each limiting groove (35) is provided with a first positioning hole (36). Each slide rail (32) is provided with a second positioning hole (37). The positioning frame (45) passes through the limiting groove (35) and the first positioning hole (36) respectively, and is inserted into the second positioning hole (37). The quick-installation component (5) is installed in the positioning plate (31) and is suitable for positioning the pressure plate (33).

2. The lithium battery casing dual-pressure testing device according to claim 1, characterized in that: The test housing (1) is equipped with a workbench (11), a guide rod (21) is installed on the workbench (11), an assembly plate (22) is installed on the guide rod (21), an electric push rod (23) is installed on the assembly plate (22), and the output end of the electric push rod (23) is connected to the intermediate plate (24).

3. The lithium battery casing dual-pressure testing device according to claim 1, characterized in that: The positioning component (4) also includes a servo motor (41) mounted on the intermediate plate (24), the output end of which is coaxially connected to one end of the bidirectional lead screw (42).

4. The lithium battery casing dual-pressure testing device according to claim 1, characterized in that: The quick-installation assembly (5) includes an assembly groove (51) opened on the positioning plate (31), two sets of springs (52) are fixed in the assembly groove (51), one end of the spring (52) is equipped with a transition plate (53) that can slide along the assembly groove (51), the transition plate (53) is equipped with an arc-shaped protrusion (54) that can extend to the outside of the assembly groove (51), and the pressure plate (33) is provided with arc-shaped grooves (55) that can be adapted to the arc-shaped protrusions (54).

5. A lithium battery casing dual-pressure testing device according to claim 4, characterized in that: The spring (52) causes the arc-shaped protrusion (54) to maintain its tendency to move toward the arc-shaped groove (55).

6. The lithium battery casing dual-pressure testing device according to claim 1, characterized in that: The positioning plates (31) are symmetrically distributed on the intermediate plate (24).

7. The lithium battery casing dual-pressure testing device according to claim 1, characterized in that: The L-shaped bracket (44) is made of aluminum alloy.

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