Tensile strength tester for lithium battery diaphragm

Abstract

The utility model discloses a lithium battery diaphragm tensile strength tester, relates to battery diaphragm technical field, including the clamping subassembly, it is equipped with two groups, each group of clamping subassembly includes cross bar, connecting piece, linkage rod and splint, the cross bar is connected to vertical plate side, cross bar far away from vertical plate one end is rotatingly connected with connecting piece, and the connecting piece is connected with the linkage rod. The connecting pieces and the top of the transverse rod are arranged in an acute angle mode, the other ends of the connecting pieces are rotationally connected with the linkage rods, the linkage rods are rotationally connected with the clamping plates, a middle rod is rotationally connected between the two linkage rods, and an elastic piece is arranged between the middle rod and the transverse rod. The group of clamping assemblies stretch the diaphragm in the direction far away from the fixed end through the horizontal moving structure, and when the vertical plate moves to drive the connecting piece to rotate, the upper linkage rod and the lower linkage rod are further driven to rotate in opposite directions, so that the clamping plates can clamp the tested diaphragm more and more tightly, and the tested diaphragm can be prevented from falling off.

Description

Technical Field

[0001] This utility model relates to the field of battery separator technology, specifically to a lithium battery separator tensile strength tester. Background Technology

[0002] As a key component inside the battery, the lithium battery separator's main function is to prevent short circuits caused by direct contact between the positive and negative electrodes. During battery use, extreme conditions such as high temperature, overcharging, and over-discharging may be encountered, which will affect the performance of the separator. Tensile strength testing can be used to evaluate the stability and reliability of the separator under these extreme conditions, ensuring the safety of the battery in harsh environments.

[0003] Authorized publication number CN219757956U discloses a lithium battery separator tensile strength testing device, including a worktable, a tensile gauge, a testing mechanism, and a fixing mechanism. This utility model solves the problem that existing testing devices, due to their simple structure, can only test the tensile strength of the separator at room temperature and cannot test the tensile force at high temperatures, resulting in low practicality. This utility model pushes the pressure plate and the mounting plate to fit together to compress the separator. By moving the heated push rod to contact the separator, the tensile strength test of the separator can be performed simultaneously with heating, thereby detecting the tensile force of the separator at high temperatures, thus improving the practicality of the testing device.

[0004] In the above scheme, the diaphragm is squeezed and fixed by pushing the pressure plate and the mounting plate to fit together. However, during the test, the tension between the clamp and the diaphragm under test will increase, which can easily cause the clamp to slip off from the diaphragm under test, thus leading to test failure. Utility Model Content

[0005] The purpose of this invention is to provide a lithium battery separator tensile strength tester to solve the technical problem in the prior art that the clamps and the separator being tested are prone to detachment as the tensile force increases.

[0006] The technical problem to be solved by this utility model can be achieved through the following technical solution:

[0007] A lithium battery separator tensile strength tester includes a base plate, a horizontally moving structure on the top of the base plate, a tensile sensor inside the base plate, and further includes:

[0008] The clamping assembly comprises two sets. One set of clamping assemblies is fixedly connected to the top of the base plate, while the other set is symmetrically slidably connected to the top of the base plate via a horizontal moving structure. Each set of clamping assemblies includes a crossbar, a connecting piece, a linkage rod, and a clamping plate. The overall structure formed by the connecting piece, linkage rod, and clamping plate is symmetrically arranged in two sets. The crossbar is connected to the side of the vertical plate, and the end of the crossbar away from the vertical plate is rotatably connected to one end of the connecting piece. The top of the connecting piece and the crossbar are set at an acute angle. The other end of the connecting piece is rotatably connected to one end of the linkage rod, and the other end of the linkage rod is rotatably connected to the clamping plate. A middle rod is symmetrically rotatably connected between the two linkage rods, and an elastic element is provided between the middle rod and the crossbar.

[0009] As a further embodiment of this utility model: the horizontal moving structure includes a middle groove and a support plate. The middle groove is opened at the top of the bottom plate along its length. A sliding groove parallel to the middle groove is also opened at the top of the bottom plate. A screw is rotatably connected inside the middle groove. A motor that can drive the screw to rotate is fixedly connected to the side of the bottom plate. Several moving blocks are provided at the bottom of the support plate. One of the moving blocks is threadedly connected to the screw, and the other moving blocks are slidably connected to the corresponding sliding groove.

[0010] As a further embodiment of this utility model: the elastic element includes a plug rod and a compression spring. The plug rod is fixedly connected to one end of the crossbar near the middle rod, and the end of the plug rod is inserted into the middle rod. A compression spring is also sleeved on the outside of the plug rod. One end of the compression spring is connected to the crossbar, and the other end is connected to the middle rod.

[0011] As a further embodiment of this utility model: magnetic blocks are provided on the opposite surfaces of the crossbar and the middle bar, and the two magnetic blocks repel each other magnetically.

[0012] As a further embodiment of this utility model, a limit spring is horizontally provided between the side of each clamping plate and the intermediate rod.

[0013] As a further embodiment of this utility model: each of the clamping plates is provided with an anti-slip pad on its opposite side, and the anti-slip pad is provided with a concave-convex structure on the side away from the clamping plate.

[0014] The beneficial effects of this utility model are:

[0015] This invention features two sets of clamping components that hold the two ends of a battery separator. One set of fixed clamping components clamps one end of the battery separator to keep it in place, while the other set of clamping components slides away from the fixed end via a horizontal moving structure to stretch the battery separator. When the vertical plate moves, it causes the connecting piece to rotate, which in turn causes the upper and lower linkage rods to rotate in opposite directions. This allows the clamping plate to clamp the separator being tested tighter and tighter, preventing the material being tested from falling off during testing. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the screw and the bearing plate of this utility model.

[0019] Figure 3 This is a schematic diagram of the connection between the connecting piece and the linkage rod of this utility model.

[0020] Figure 4 This is a schematic diagram of the connection structure of the insertion rod and the intermediate rod of this utility model.

[0021] In the diagram: 1. Base plate; 12. Intermediate groove; 13. Slide groove; 2. Motor; 21. Screw; 3. Bearing plate; 31. Moving block; 32. Vertical plate; 4. Horizontal bar; 41. Connecting piece; 42. Linkage rod; 43. Clamping plate; 44. Anti-slip pad; 45. Intermediate rod; 5. Insert rod; 51. Compression spring; 6. Magnetic block; 7. Limiting spring. Detailed Implementation

[0022] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figures 1-4As shown, the lithium battery separator tensile strength tester includes a base plate 1, with a horizontally moving structure on the top of the base plate 1. A tensile sensor is installed inside the base plate 1 and electrically connected to an external computing system via wires. It also includes clamping assemblies, with two sets of clamping assemblies. One set of clamping assemblies is fixedly connected to the top of the base plate 1, while the other set is symmetrically slidably connected to the top of the base plate 1 via the horizontally moving structure. Each clamping assembly includes a crossbar 4, a connecting piece 41, a linkage rod 42, and a clamping plate 43. The overall structure formed by the connecting piece 41, linkage rod 42, and clamping plate 43 is symmetrical vertically. There are two sets of crossbars 4 connected to the side of the vertical plate 32. The end of the crossbar 4 away from the vertical plate 32 is rotatably connected to the end of the connecting piece 41 through a pivot. The connecting piece 41 is set at an acute angle to the top of the crossbar 4. The other end of the connecting piece 41 is rotatably connected to the end of the linkage rod 42 through a pivot. The other end of the linkage rod 42 is rotatably connected to the clamping plate 43 through a hinge seat. A middle rod 45 is symmetrically rotatably connected between the two linkage rods 42. An elastic element is provided between the middle rod 45 and the crossbar 4. In the initial state, the elastic element abuts against the middle rod 45, and there is a pre-pressure between the two clamping plates 43.

[0024] In some specific implementation plans, such as Figure 1 As shown, to facilitate the horizontal pulling of the battery separator, the horizontal moving structure includes a central groove 12 and a support plate 3. The central groove 12 is opened at the top along the length of the base plate 1. A sliding groove 13 parallel to the central groove 12 is also opened at the top of the base plate 1. A screw 21 is rotatably connected inside the central groove 12. A motor 2 that can drive the screw 21 to rotate is fixedly connected to the side of the base plate 1. The motor 2 is fixedly connected to the side of the base plate 1, and the output end of the motor 2 is connected to the end of the screw 21. Several moving blocks 31 are provided at the bottom of the support plate 3. One moving block 31 is threadedly connected to the screw 21, and the other moving blocks 31 are slidably connected to the corresponding sliding groove 13. The motor 2 drives the screw 21 to rotate, and the moving block 31 threadedly connected to the screw 21 drives the support plate 3 to move. The remaining moving blocks 31 are slidably connected in the corresponding sliding groove 13.

[0025] In some specific implementation plans, such as Figure 4 As shown, in order to facilitate the opening and closing of the two clamping plates 43 by means of elastic components, the elastic components include a plug rod 5 and a compression spring 51. The plug rod 5 is fixedly connected to one end of the crossbar 4 near the middle rod 45, and the end of the plug rod 5 is inserted into the middle rod 45. A compression spring 51 is also sleeved on the outside of the plug rod 5. One end of the compression spring 51 is fixedly connected to the crossbar 4, and the other end is fixedly connected to the middle rod 45. By bringing the crossbar 4 and the middle rod 45 closer to each other, the compression spring 51 is compressed. At this time, the end of the linkage rod 42 near the clamping plate 43 opens, so that the two anti-slip pads 44 can move closer to each other or further apart.

[0026] In some specific implementation plans, such as Figure 3As shown, in order to further enhance the pre-clamping force of the two clamping plates 43 on the diaphragm, magnetic blocks 6 are provided on the opposite surfaces of the crossbar 4 and the intermediate rod 45. The two magnetic blocks 6 repel each other magnetically, and the magnetic repulsion of the magnetic blocks 6 causes the crossbar 4 and the intermediate rod 45 to generate a mutual pushing force, which can increase the clamping force between the two clamping plates 43.

[0027] In some specific implementation plans, such as Figure 4 As shown, in order to keep the clamping plate 43 in a horizontal position, a limit spring 7 is horizontally provided between the side of each clamping plate 43 and the middle rod 45 to prevent the clamping plate 43 connected by rotation from tilting up and down.

[0028] In some specific implementation plans, such as Figure 3 As shown, in order to facilitate the clamping effect of the clamping plate 43 on the diaphragm, each clamping plate 43 is provided with an anti-slip pad 44 on the opposite side. The anti-slip pad 44 is provided with a concave-convex structure on the side away from the clamping plate 43. The concave-convex structure can prevent the diaphragm under test from slipping off the clamping plate 43 during the test.

[0029] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios:

[0030] When the compression spring 51 is in its natural state, the two clamping plates 43 are closed. When fixing the diaphragm, the upper ends of the two linkage rods 42 are pushed inward simultaneously to open them. Then, the diaphragm to be tested is placed between the two open clamping plates 43. The force pushing the linkage rods 42 is removed. Under the reset action of the compression spring 51, the middle rod 45 moves closer to the horizontal rod 4, and the connecting piece 41 flips to both sides at a certain angle, causing the upper ends of the linkage rods 42 to push outward, thereby closing the two clamping plates 43 and pre-fixing the diaphragm. The moving clamping assembly slides away from the fixed end through the horizontal moving structure to stretch the battery diaphragm and apply a pulling force to the horizontal rod 4. The greater the pulling force, the more the upper ends of the linkage rods 42 open outward, the tighter the two clamping plates 43 clamp, and the less likely the diaphragm is to loosen.

[0031] The foregoing has described several embodiments of this utility model in detail, but these embodiments are not limited thereto and should not be considered as limiting the scope of this utility model. All equivalent changes and improvements made within the scope of the claims of this utility model should still fall within the patent coverage of this utility model.

Claims

1. A lithium battery separator tensile strength tester, comprising a base plate (1), the top of the base plate (1) is provided with a horizontal moving structure, the inside of the base plate (1) is provided with a tension sensor, characterized in that, Also includes: The clamping assembly is fixedly connected on the top of the bottom plate (1), and the other group of the clamping assembly is slidably connected on the top of the bottom plate (1) in a symmetrical manner through the horizontal moving structure. Each group of the clamping assembly comprises a cross bar (4), a connecting piece (41), a linkage rod (42) and a clamping plate (43). The connecting piece (41), the linkage rod (42) and the clamping plate (43) are symmetrically arranged in two groups. The cross bar (4) is connected to the side of the vertical plate (32). One end of the cross bar (4) away from the vertical plate (32) is rotatably connected to one end of the connecting piece (41). The connecting piece (41) is arranged at an acute angle with the top of the cross bar (4). The other end of the connecting piece (41) is rotatably connected to one end of the linkage rod (42). The other end of the linkage rod (42) is rotatably connected to the clamping plate (43). The intermediate rod (45) is symmetrically rotatably connected between the two linkage rods (42). The intermediate rod (45) and the cross bar (4) are provided with a spring. The spring comprises a plug rod (5) and a compression spring (51). The plug rod (5) is fixedly connected to one end of the cross bar (4) close to the intermediate rod (45). The end of the plug rod (5) is inserted into the intermediate rod (45). The plug rod (5) is further provided with a compression spring (51) on the outside. One end of the compression spring (51) is connected to the cross bar (4), and the other end is connected to the intermediate rod (45).

2. The lithium battery separator tensile strength tester of claim 1, wherein, The horizontal moving structure comprises an intermediate groove (12) and a bearing plate (3). The intermediate groove (12) is provided on the top of the bottom plate (1) along the long direction. The top of the bottom plate (1) is further provided with a sliding groove (13) parallel to the intermediate groove (12). The screw rod (21) is rotatably connected in the intermediate groove (12). The motor (2) is fixedly connected to the side of the bottom plate (1) and can drive the screw rod (21) to rotate. The bearing plate (3) is provided with a plurality of moving blocks (31) at the bottom. One of the moving blocks (31) is threadedly connected to the screw rod (21), and the other moving blocks (31) are slidably connected to the corresponding sliding grooves (13).

3. The lithium battery separator tensile strength tester of claim 2, wherein, The opposite surfaces of the cross bar (4) and the intermediate rod (45) are provided with magnetic blocks (6). The two magnetic blocks (6) repel each other magnetically.

4. The lithium battery separator tensile strength tester of claim 1, wherein, A limiting spring (7) is horizontally arranged between the side of each clamping plate (43) and the intermediate rod (45).

5. The lithium battery separator tensile strength tester of claim 1, wherein, Each clamping plate (43) is provided with a non-slip pad (44) on the opposite surface. The non-slip pad (44) is provided with a concave-convex structure away from the clamping plate (43).

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