Electrode lug bending rigidity testing device

Abstract

The utility model belongs to the technical field of battery manufacturing, and discloses a tab bending rigidity testing device which comprises a placing table, a lifting mechanism, a lower pressing plate and a force measuring mechanism, the lifting mechanism is arranged below the placing table, and the lifting mechanism is used for driving the placing table to lift; the lower pressing plate is arranged above the placing table and can move up and down; and the force measuring mechanism is arranged on one side of the placing table. When the tab bending rigidity testing device is used for detection, a pole piece is firstly placed on the placing table, the tab extends to one side, facing the force measuring mechanism, of the placing table, then the force measuring mechanism is in contact with the upper surface of the tab, the lower pressing plate presses the pole piece, then the lifting mechanism drives the placing table and the lower pressing plate to move upwards for a distance D, and the tab bending rigidity testing device is used for testing the bending rigidity of the tab. The pole piece is driven to move upwards by a distance D, at the moment, the pole lug is bent, the bending force F is measured through the force measuring mechanism, then F / D is calculated, the bending rigidity of the pole lug can be obtained, and the accuracy of the detection result is high.

Description

Electrode Bending Stiffness Testing Device Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a device for testing the bending stiffness of electrode tabs. Background Technology

[0002] The tabs serve to connect the internal stacked components with external series and parallel circuits, requiring good bending resistance and the ability to prevent weld cracking after welding. After battery molding, the process involves assembling modules and battery packs. During module assembly, the battery tabs need to be bent to connect the batteries in parallel. If the battery tabs have poor bending performance, cracks may appear during tab shaping and welding. This can lead to open circuits during battery assembly or operation, potentially causing power system failure and affecting the overall vehicle performance.

[0003] Therefore, it is necessary to test the bending stiffness of the tabs before production to prevent electrodes with substandard bending stiffness from entering the production line. Existing testing methods mostly rely on estimation to obtain the bending stiffness of the tabs, which is not accurate enough and has large errors. Summary of the Invention

[0004] The purpose of this invention is to provide a device for testing the bending stiffness of the electrode lugs, which has high accuracy.

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

[0006] The electrode bending stiffness testing device includes:

[0007] Placement platform;

[0008] A lifting mechanism is provided below the placement platform, and the lifting mechanism is used to drive the placement platform to rise and fall;

[0009] A lower pressure plate is disposed above the placement platform. The lower pressure plate can move up and down relative to the placement platform and can move up and down together with the placement platform.

[0010] A force measuring mechanism is located on one side of the placement platform.

[0011] The beneficial effects of this utility model are:

[0012] This utility model provides a device for testing the bending stiffness of an electrode tab. When using this device for testing, the electrode is first placed on the placement platform, with the electrode tab extending to the side of the platform facing the force measuring mechanism. Then, the force measuring mechanism contacts the upper surface of the electrode tab, and the lower pressure plate moves down to press down on the electrode tab. Then, the lifting mechanism drives the placement platform and the lower pressure plate to move up a distance D together, thereby moving the electrode tab up a distance D. At this time, the electrode tab bends, and the bending force F is measured by the force measuring mechanism. Then, F / D is calculated to obtain the bending stiffness of the electrode tab. The test results are highly accurate. Attached Figure Description

[0013] Figure 1 is a schematic diagram of the structure of the electrode bending stiffness testing device provided in an embodiment of the present invention;

[0014] Figure 2 is a front view of the electrode bending stiffness testing device provided in an embodiment of this utility model;

[0015] Figure 3 is a cross-sectional view of the electrode bending stiffness testing device provided in an embodiment of the present invention;

[0016] Figure 4 is a structural schematic diagram of the force measuring mechanism involved in the embodiment of this utility model.

[0017] In the picture:

[0018] 10. Placement platform; 20. Lifting mechanism; 21. Fixed base; 22. Moving base; 221. Strip hole; 222. Protruding column; 23. Control lever; 24. Curved rod; 241. First end; 242. Second end; 25. Locking screw; 30. Lower pressure plate; 40. Force measuring mechanism; 41. Detection head; 42. Vertical adjustment assembly; 421. Vertical guide; 422. Vertical sliding component; 43. Horizontal adjustment assembly; 431. Horizontal guide; 4311. Guide hole; 432. Horizontal sliding component; 44. Base; 50. Guide column; 60. Base; 70. Fixed plate; 81. Lifting rod; 82. Handle;

[0019] 100. Electrode; 101. Electrode. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] As shown in Figures 1 to 4, this embodiment of the present invention provides an electrode tab bending stiffness testing device, including a placement platform 10, a lifting mechanism 20, a lower pressure plate 30, and a force measuring mechanism 40. The placement platform 10 is used to place the electrode 100; the lifting mechanism 20 is disposed below the placement platform 10 and is used to drive the placement platform 10 to rise and fall; the lower pressure plate 30 is disposed above the placement platform 10 and can move up and down relative to the placement platform 10 and can move up and down together with the placement platform 10; the force measuring mechanism 40 is disposed on one side of the placement platform 10 and includes a detection head 41 and a force sensor. The detection head 41 is electrically connected to the force sensor and is used to contact the electrode tab 101. The force sensor is used to detect the contact pressure between the detection head 41 and the electrode tab 101. When using this electrode bending stiffness testing device, the electrode 100 is first placed on the placement platform 10, and the electrode 101 extends to the side of the placement platform 10 facing the force measuring mechanism 40. Then, the detection head 41 of the force measuring mechanism 40 contacts the upper surface of the electrode 101, and the lower pressure plate 30 presses down on the electrode 100. Then, the lifting mechanism 20 drives the placement platform 10 and the lower pressure plate 30 to move upward by a distance D, thereby causing the electrode 100 to move upward by a distance D. At this time, the electrode 101 bends, and the bending force F is measured by the force sensor. Then, F / D is calculated to obtain the bending stiffness of the electrode 101. The test results have high accuracy.

[0025] Furthermore, the position of the detection head 41 can be adjusted vertically. Before placing the electrode 100 onto the placement stage 10, the detection stage is first adjusted to move upwards vertically. After the electrode 100 is placed on the placement stage 10, the detection head 41 is then adjusted to move downwards vertically to contact the tab 101. This avoids interference between the detection head 41 and the tab 101 during placement, and also avoids the initial contact between the detection head 41 and the tab 101 causing a pressing force on the tab 101, which would reduce the accuracy of the detection results. It also accommodates tabs 101 of different thicknesses. In this embodiment, the force measuring mechanism 40 includes a vertical adjustment component 42, which is used to adjust the position of the detection head 41 vertically. The vertical adjustment assembly 42 includes a vertical guide 421 and a vertical slider 422. The vertical guide 421 is arranged in the vertical direction, and the vertical slider 422 is slidably engaged with the vertical guide 421. The vertical slider 422 can drive the detection head 41 to adjust its position in the vertical direction. In this embodiment, the vertical guide 421 is a slide rail, and the vertical slider 422 is a slider. In other embodiments, one of the vertical guide 421 and the vertical slider 422 is provided with a sliding groove, and the other is provided with a sliding protrusion, which is slidably engaged with the sliding groove.

[0026] Furthermore, the position of the detection head 41 can be adjusted horizontally. By adjusting the horizontal position of the detection head 41, the bending stiffness of the tab 101 at different horizontal positions can be detected. The position of the detection head 41 can be adjusted as needed, offering high flexibility; it can also adapt to tabs 101 of different sizes. In this embodiment, the force measuring mechanism 40 includes a horizontal adjustment component 43, which is used to adjust the horizontal position of the detection head 41. The horizontal adjustment component 43 includes a horizontal guide 431 and a horizontal slider 432. The horizontal guide 431 is disposed on the vertical slider 422, and the horizontal slider 432 slides in cooperation with the horizontal guide 431. The detection head 41 is disposed on the horizontal slider 432, and the horizontal position of the detection head 41 is adjusted by sliding the horizontal slider 432 along the horizontal guide 431. In this embodiment, the horizontal guide member 431 is provided with a strip-shaped guide hole 4311 extending horizontally. The horizontal slider 432 slides through the guide hole 4311, with its upper end limited to the upper end surface of the horizontal guide member 431. The lower end of the horizontal slider 432 is directly connected to the detection head 41 or connected to the detection head 41 through an intermediate connector. In other embodiments, the horizontal guide member 431 can also be a slide rail, and the horizontal slider 432 can be a slider that slides with the slide rail.

[0027] In this embodiment, two sets of vertical adjustment components 42 are provided, which are distributed at intervals along the horizontal direction. A horizontal adjustment component 43 is disposed between the two sets of vertical adjustment components 42. The two ends of the horizontal guide 431 are respectively connected to two vertical sliding members 422. This makes the vertical and horizontal movement of the detection head 41 more stable. In this embodiment, the vertical guide 421 in the two sets of vertical adjustment components 42 are respectively disposed on two bases 44, which reduces the size of the vertical guide 421 while ensuring the vertical adjustment range of the detection head 41.

[0028] In this embodiment, the lifting mechanism 20 includes a fixed base 21, a movable base 22, a control rod 23, and a crank rod 24. The control rod 23 is movable relative to the fixed base 21, and optionally, the control rod 23 is threadedly connected to the fixed base 21. The crank rod 24 is rotatably connected to the fixed base 21, and the crank rod 24 rotates eccentrically. One end of the crank rod 24 abuts against the control rod 23, and the other end abuts against the movable base 22. The movable base 22 is movable up and down relative to the fixed base 21 and is connected to the placement platform 10. By moving the control rod 23 forward, the crank rod 24 can be driven to rotate, thereby driving the movable base 22 to move upward relative to the fixed base 21, and thus moving the placement platform 10 upward, which can accurately control the rising distance of the placement platform 10. At the same time, the rising process of the placement platform 10 is smooth, which is beneficial to improving the accuracy of detection. By moving the control rod 23 backward, the force applied to the crank rod 24 can be removed, and the placement platform 10 and the movable base 22 descend under the action of gravity, thereby resetting the crank rod 24.

[0029] In this embodiment, the bottom of the movable seat 22 has a protrusion 222, and the crank 24 abuts against the protrusion 222. When the crank 24 drives the movable seat 22 to move, it can reduce the rotation angle of the crank 24. Furthermore, the crank 24 has two ends, namely a first end 241 and a second end 242. The first end 241 abuts against the control rod 23, and the second end 242 abuts against the protrusion 222 at the bottom of the movable seat 22. When the movable seat 22 is in the initial position, the second end 242 is located below the protrusion 222. When the crank 24 rotates, it can directly act on the protrusion 222, thereby further reducing the rotation angle of the crank 24.

[0030] Furthermore, the lifting mechanism 20 also includes a guide structure, which is arranged vertically to guide the up-and-down movement of the movable seat 22, ensuring that the movable seat 22 always moves vertically and preventing the placement platform 10 from shaking during movement. In this embodiment, the guide structure includes a guide protrusion and a guide groove. The guide protrusion is disposed on one of the fixed seat 21 and the movable seat 22, and the guide groove is disposed on the other of the fixed seat 21 and the movable seat 22. The guide protrusion and the guide groove are slidably engaged.

[0031] Furthermore, the lifting mechanism 20 also includes a locking structure. This locking structure locks the movable seat 22 after it has moved into position, ensuring the stability of the placement platform 10 and improving the accuracy of the detection. In this embodiment, the locking structure includes a locking screw 25, a slotted hole 221, and a locking hole. The slotted hole 221 is located on the movable seat 22, and the locking hole is located on the fixed seat 21. The locking screw 25 slides through the slotted hole 221 and is threadedly connected to the locking hole. When the lifting mechanism 20 drives the movable seat 22 to rise or fall, the locking nut is first loosened, and then the control lever 23 is turned to control the rise or fall of the movable seat 22. At this time, relative sliding occurs between the locking nut and the slotted hole 221. After the movable seat 22 moves into position, the locking nut is tightened, thereby locking the movable seat 22. The locking method is simple and convenient.

[0032] Furthermore, the lifting mechanism 20 also includes a measuring element used to measure the moving distance of the movable seat 22, thereby obtaining the moving distance of the placement platform 10. In this embodiment, the measuring element is a micrometer, which is mounted on the fixed base 21. The moving distance of the placement platform 10 can be observed directly through the micrometer.

[0033] The electrode bending stiffness testing device provided in this embodiment also includes multiple guide posts 50, and the lower pressure plate 30 is slidably connected to the multiple guide posts 50. The lower pressure plate 30 descends under its own weight to press down on the electrode 100 on the placement stage 10, so that when the placement stage 10 rises, the lower pressure plate 30 can rise synchronously with the placement stage 10 to ensure that the electrode 100 is always pressed tightly.

[0034] Furthermore, the tab bending stiffness testing device provided in this embodiment also includes a base 60 and a fixing plate 70. The lifting mechanism 20 and the force measuring mechanism 40 are both fixed on the base 60. One end of the guide column 50 is connected to the base 60, and the other end is connected to the fixing plate 70. The fixing plate 70 is located above the lower pressure plate 30. Through the above arrangement, all the structures in the tab bending stiffness testing device are integrated into a whole, which facilitates the overall movement.

[0035] Furthermore, the electrode bending stiffness testing device provided in this embodiment also includes a lifting rod 81, which is slidably connected to the fixing plate 70, and the lower end of the lifting rod 81 is fixedly connected to the lower pressure plate 30. Before placing the electrode 100 onto the placement platform 10, the lower pressure plate 30 can be lifted to a certain distance from the placement platform 10 by the lifting rod 81, so as to facilitate the placement of the electrode 100 onto the placement platform 10; after the electrode 100 is placed on the placement platform 10, the lifting rod 81 is released, and the lower pressure plate 30 moves down under the action of gravity to press down on the electrode 100. During the upward and downward movement of the lower pressure plate 30, the lifting rod 81 can also guide the lower pressure plate. Furthermore, a handle 82 is provided at the upper end of the lifting rod 81 to facilitate applying a lifting force to the lifting rod 81.

[0036] In this embodiment, a positioning groove is provided on the placement platform 10. The end of the positioning groove opposite to the force measuring mechanism 40 extends to the edge of the placement platform 10. When the electrode 100 is placed in the positioning groove, the electrode tab 101 can extend out to the edge through the positioning groove. The positioning groove can limit the electrode 100 and prevent the electrode 100 from shifting. The depth of the positioning groove is less than the thickness of the electrode 100, ensuring that the lower pressure plate 30 can press down to tighten the electrode 100.

[0037] 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 device for testing the bending stiffness of an electrode lug, characterized in that, include: Placement platform (10); A lifting mechanism (20) is disposed below the placement platform (10) and is used to drive the placement platform (10) to rise and fall; a lower pressure plate (30) is disposed above the placement platform (10) and is able to move up and down relative to the placement platform (10) and move up and down together with the placement platform (10); a force measuring mechanism (40) is disposed on one side of the placement platform (10).

2. The electrode lug bending stiffness testing device according to claim 1, characterized in that, The force measuring mechanism (40) includes a detection head (41) and a force sensor, wherein the detection head (41) is electrically connected to the force sensor.

3. The electrode lug bending stiffness testing device according to claim 2, characterized in that, The electrode bending stiffness testing device further includes a vertical adjustment component (42), which includes a vertical guide (421) and a vertical slider (422). The vertical guide (421) is arranged in the vertical direction, and the vertical slider (422) slides in cooperation with the vertical guide (421). The vertical slider (422) can drive the detection head (41) to adjust its position in the vertical direction.

4. The electrode bending stiffness testing device according to claim 3, characterized in that, The electrode bending stiffness testing device further includes a horizontal adjustment component (43), which includes a horizontal guide (431) and a horizontal sliding component (432). The horizontal guide (431) is disposed on the vertical sliding component (422), and the horizontal sliding component (432) slides in cooperation with the horizontal guide (431). The detection head (41) is disposed on the horizontal sliding component (432).

5. The electrode bending stiffness testing device according to claim 1, characterized in that, The lifting mechanism (20) includes a fixed seat (21), a movable seat (22), a control rod (23), and a crank rod (24). The control rod (23) is movable relative to the fixed seat (21). The crank rod (24) is rotatably connected to the fixed seat (21). One end of the crank rod (24) abuts against the control rod (23), and the other end abuts against the movable seat (22). The movable seat (22) is movable up and down relative to the fixed seat (21). The movable seat (22) is connected to the placement platform (10).

6. The electrode bending stiffness testing device according to claim 5, characterized in that, The lifting mechanism (20) further includes a guide structure, which includes a guide protrusion and a guide groove. The guide protrusion is disposed on one of the fixed seat (21) and the movable seat (22), and the guide groove is disposed on the other of the fixed seat (21) and the movable seat (22). The guide protrusion and the guide groove slide in a vertical direction.

7. The electrode bending stiffness testing device according to claim 5, characterized in that, The lifting mechanism (20) also includes a locking structure, which includes a locking screw (25). The movable seat (22) is provided with a strip hole (221) extending in the vertical direction, and the fixed seat (21) is provided with a locking hole. The locking screw (25) passes through the strip hole (221) and is threadedly connected to the locking hole.

8. The electrode bending stiffness testing device according to claim 5, characterized in that, The lifting mechanism (20) also includes a measuring element for measuring the moving distance of the movable seat (22).

9. The electrode lug bending stiffness testing device according to any one of claims 1-8, characterized in that, It also includes multiple guide posts (50), and the lower pressure plate (30) is slidably connected to the multiple guide posts (50).

10. The electrode lug bending stiffness testing device according to claim 9, characterized in that, It also includes a base (60) and a fixing plate (70). The lifting mechanism (20) is fixed on the base (60). One end of the guide column (50) is connected to the base (60), and the other end is connected to the fixing plate (70). The fixing plate (70) is located above the lower pressure plate (30).

11. The electrode lug bending stiffness testing device according to any one of claims 1-8, characterized in that, The placement platform (10) is provided with a positioning groove, and one end of the positioning groove opposite to the force measuring mechanism (40) extends to the edge of the placement platform (10).

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