Hierarchical simulation device for ultimate breakdown voltage of lithium battery diaphragm

Abstract

The invention relates to the technical field of lithium battery safety test and material performance evaluation, in particular to a hierarchical simulation device for ultimate breakdown voltage of a lithium battery diaphragm, which comprises a hierarchical voltage generation module, a mounting disc, a rotating shaft frame, a support cross frame, a loading frame group and a voltage output end, the diaphragm is comprehensively tested through the voltage output end; the loading frame group can be rotatably adjusted to realize testing of different positions of the diaphragm; the limiting rotating shaft and the lifting column ensure test stability and flexibility. The experiment disc is provided with a grid groove and a positioning round sticker, and the testing positioning and heat dissipation performance is optimized. The method can comprehensively evaluate the overall voltage resistance of the diaphragm, solves the limitation of local test, and has high practical value and technical advantages.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery safety testing and material performance evaluation, and particularly to a hierarchical simulation device for the ultimate breakdown voltage of a lithium battery separator. Background Art

[0002] In a lithium-ion battery, the main function of the separator is to separate the positive and negative electrodes of the battery to prevent short circuits caused by contact between the two poles. During the battery manufacturing process, due to dust and burrs on the positive and negative electrode materials, short circuit problems may occur. Therefore, lithium-ion battery manufacturers usually perform a high-voltage test after the battery cell is assembled to detect short circuits and screen out battery cells with potential hidden dangers. Currently, most of the tests for the voltage resistance performance of the separator adopt static methods. The specific operation is to place a separator on a group of metal platforms, then cover a metal plate or a rod-shaped metal block above it, and connect the metal platforms and the metal plate or rod-shaped metal block to a breakdown voltage tester to measure the voltage value required to break down the separator.

[0003] However, the foregoing method can only test a local area of the separator and is difficult to comprehensively reflect the actual voltage resistance performance of the entire membrane surface of the separator. Summary of the Invention

[0004] The purpose of the present invention is to provide a hierarchical simulation device for the ultimate breakdown voltage of a lithium battery separator to solve the technical problem that the prior art can only perform voltage resistance tests on local areas of the separator and cannot comprehensively reflect the ultimate breakdown performance of the entire separator.

[0005] A hierarchical simulation device for the ultimate breakdown voltage of a lithium battery separator provided by the present invention at least includes a hierarchical voltage generation module, a mounting disk, a rotating shaft frame, a supporting cross frame, a loading frame group, and a voltage output terminal; wherein, the mounting disk is fixedly connected to the hierarchical voltage generation module, the rotating shaft frame is rotatably connected to the mounting disk, the supporting cross frame is fixedly attached to the bottom of the mounting disk, the loading frame group is rotatably connected to the supporting cross frame, and the voltage output terminal is movably connected to the bottom of the hierarchical voltage generation module.

[0006] In some embodiments, the hierarchical voltage generation module at least includes a first voltage generation unit, a second voltage generation unit, and a third voltage generation unit. The output voltage of the first voltage generation unit is lower than the output voltage of the second voltage generation unit, and the output voltage of the second voltage generation unit is lower than the output voltage of the third voltage generation unit. In some embodiments, the loading frame group includes a frame body, a fixed platform connected to the frame body, a placement platform, and an experimental disk; the fixed platform is fixedly connected to the placement platform, the placement platform is detachably connected to the experimental disk, and the experimental disk is used to place the lithium battery separator to be tested.

[0007] In some embodiments, a plurality of positioning circular stickers are attached to the end face of the experimental disk, a raised edge is provided at the edge of the experimental disk, and a grid-shaped groove is provided on the surface of the experimental disk.

[0008] In some embodiments, the bottom of the rotating shaft frame is fixedly connected to a first base, a lifting column is provided between the first base and the rotating shaft frame, a limiting rotating shaft is arranged inside the rotating shaft frame, and the limiting rotating shaft is connected to the rotating shaft frame through a limiting groove.

[0009] In some embodiments, a bearing assembly is provided between the mounting disk and the rotating shaft frame. The bearing assembly includes an outer ring, an inner ring and rolling elements. The outer ring is fixedly connected to the rotating shaft frame, and the inner ring is fixedly connected to the mounting disk.

[0010] In some embodiments, the voltage output end at least includes a conductive contact, an insulating housing and an adjusting knob. The conductive contact is connected to the voltage transmission channel, the insulating housing wraps the conductive contact, and the adjusting knob is used to adjust the position of the conductive contact.

[0011] In some embodiments, the loading and unloading frame group further includes a plurality of fixing jigs. The fixing jigs include clamping arms, spring pieces and locking bolts. The clamping arms are hinged to the placing table, and the spring pieces are arranged between the clamping arms and the placing table.

[0012] In some embodiments, the supporting cross frame includes a cross beam and reinforcing ribs. The cross beam is fixedly attached to the bottom of the mounting disk. The reinforcing ribs are arranged between the cross beams. Connecting holes are provided at both ends of the cross beam, and threads are provided in the connecting holes.

[0013] In some embodiments, a damping mechanism is arranged in the limiting groove. The damping mechanism is used to control the rotation resistance of the limiting rotating shaft, and the rotation angle of the limiting rotating shaft is 0°-90°.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention generates voltages of different levels through a hierarchical voltage generation module, and combines the voltage output end to comprehensively test the diaphragm, solving the problem in the prior art that only the local area of the diaphragm can be tested for the ultimate breakdown voltage; at the same time, through the rotation and adjustment functions of the loading and unloading frame group, the test requirements for different positions of the diaphragm are realized; through the design of the limiting rotating shaft and the lifting column, the stability and flexibility during the test are ensured; the technical solution of the present invention can accurately evaluate the overall voltage resistance performance of lithium-ion battery diaphragms in practical applications, and has high practical value and technical advantages. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is an axonometric schematic diagram of the hierarchical simulation device of the present invention; Figure 2 is a front view schematic diagram of the hierarchical simulation device of the present invention; Figure 3 is a positioning circle sticker schematic diagram of the hierarchical simulation device of the present invention.

[0017] In the figure: 1 - Rotating shaft frame; 2 - Mounting disk; 3 - Hierarchical voltage generation module; 4 - Support cross frame; 5 - Loading rack group; 6 - Placement table; 7 - Experiment disk; 8 - Base; 9 - Frame body; 10 - Fixed table; 11 - Lifting column; 12 - Limit rotating shaft; 13 - Auxiliary support seat; 14 - Voltage transmission channel; 15 - First voltage generation unit; 16 - Second voltage generation unit; 17 - Third voltage generation unit; 18 - Positioning circle sticker; Attached Figure 1 - Attached Figure 2 is guided by a dotted line in the figure to avoid interference with technical features. Specific embodiments

[0018] The following will combine the attached drawings in the embodiments of the present invention Figures 1 - 3 to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0019] Embodiment The specific embodiments of the present invention are described in detail in combination with the drawings to ensure the integrity and operability of the technical solutions. Such as Figure 1As shown in the figure, a hierarchical simulation device for the ultimate breakdown voltage of a lithium-ion battery separator is provided, which at least includes a hierarchical voltage generation module 3, a mounting plate 2, a rotating shaft frame 1, a supporting cross frame 4, a loading frame group 5, and a voltage output terminal; wherein, the mounting plate 2 is fixedly connected to the hierarchical voltage generation module 1, the rotating shaft frame 1 is rotatably connected to the mounting plate 2, the supporting cross frame 4 is fixedly attached to the bottom of the mounting plate 2, the loading frame group 5 is rotatably connected to the supporting cross frame 4, and the voltage output terminal is movably connected to the bottom of the hierarchical voltage generation module 1. Preferably, the hierarchical voltage generation module 1 is fixedly connected to an auxiliary support base 13, and the auxiliary support platform 13 is used to maintain the stability of the hierarchical voltage generation module 3. The hierarchical voltage generation module 3 at least includes a first voltage generation unit 15, a second voltage generation unit 16, and a third voltage generation unit 17. The output voltage of the first voltage generation unit 15 is lower than the output voltage of the second voltage generation unit 16, and the output voltage of the second voltage generation unit 16 is lower than the output voltage of the third voltage generation unit 17. A voltage transmission channel 14 is provided between the hierarchical voltage generation module 3 and the voltage output terminal, and the voltage transmission channel 14 is used to transmit the voltage generated by the hierarchical voltage generation module 3 to the voltage output terminal.

[0020] The loading frame group 5 includes a frame body 9, a fixed platform 10 connected to the frame body 9, a placement platform 6, and an experimental plate 7; the fixed platform 10 is fixedly connected to the placement platform 6, the placement platform 6 is detachably connected to the experimental plate 7, and the experimental plate 7 is used to place the lithium-ion battery separator to be tested. A plurality of positioning circular stickers 18 are attached to the end face of the experimental plate 7, and the positioning circular stickers 18 are used to mark the test positions of the separator and assist in the positioning operation during the test. A rotating pair is provided between the frame body 9 and the supporting cross frame 4, and the rotating pair allows the frame body 9 to rotate in the horizontal direction to adjust the position of the experimental plate 7.

[0021] A base 8 is fixedly connected to the bottom of the rotating shaft frame 1, and a lifting column is provided between the base 8 and the rotating shaft frame 1. The lifting column is used to adjust the height of the rotating shaft frame 1. A limiting rotating shaft 12 is provided inside the rotating shaft frame 1, and the limiting rotating shaft 12 is used to limit the rotation range of the rotating shaft frame 1, and its rotation angle is from 0° to 90°. The limiting rotating shaft 12 is connected to the rotating shaft frame 1 through a limiting groove, and a damping mechanism is provided in the limiting groove. The damping mechanism is used to control the rotation resistance of the limiting rotating shaft 12.

[0022] A bearing assembly is provided between the mounting plate 2 and the rotating shaft frame 1. The bearing assembly includes an outer ring, an inner ring, and rolling elements. The outer ring is fixedly connected to the rotating shaft frame 1, the inner ring is fixedly connected to the mounting plate 2, and the rolling elements are located between the outer ring and the inner ring. The bearing assembly allows the mounting plate 2 to rotate freely relative to the rotating shaft frame 1 while maintaining the stability of the mounting plate 2. A sliding track is provided at the bottom of the mounting plate 2. The sliding track is slidably connected to the supporting cross frame 4, and balls are provided in the sliding track. The balls are used to reduce the friction between the mounting plate 2 and the supporting cross frame 4.

[0023] The voltage output terminal includes a conductive contact, an insulating housing, and an adjustment knob. The conductive contact is connected to the voltage transmission channel 14. The insulating housing wraps the conductive contact, and the adjustment knob is used to adjust the position of the conductive contact.

[0024] The voltage output terminal is connected to the hierarchical voltage generation module 3 through a universal joint. The universal joint allows the voltage output terminal to swing freely within a certain range to meet the requirements of different test positions. The load rack group 5 also includes a plurality of fixing clamps. The fixing clamps are used to fix the experimental plate 7 on the placement table 6. The fixing clamp includes a clamping arm, a spring piece, and a locking bolt. The clamping arm is hinged to the placement table 6. The spring piece is arranged between the clamping arm and the placement table 6. The locking bolt is used to fix the position of the clamping arm. An anti-slip pad is arranged at the end of the clamping arm. The anti-slip pad is used to increase the friction between the clamping arm and the experimental plate 7 to prevent the experimental plate 7 from shifting during the test.

[0025] The support cross-frame 4 includes a cross beam and reinforcing ribs. The cross beam is fixedly attached to the bottom of the experimental plate 7. The reinforcing ribs are arranged between the cross beams. The reinforcing ribs are used to improve the overall strength of the support cross-frame 4. Connecting holes are arranged at both ends of the cross beam. The connecting holes are used to connect with the frame body 9. Threads are arranged in the connecting holes to cooperate with the bolts on the frame body 9 to achieve the fixed connection between the support cross-frame 4 and the frame body 9. The experimental plate 7 is made of a high-temperature resistant insulating material. Grid-like grooves are arranged on the surface of the experimental plate 7. The grid-like grooves are used to guide the heat generated during the test to dissipate, avoiding the influence of heat accumulation on the test results. A raised edge is arranged at the edge of the experimental plate 7. The raised edge is used to prevent the diaphragm from sliding out of the experimental plate 7 during the test.

[0026] In practical applications, first, place the lithium battery diaphragm to be tested on the experimental plate 7 and mark the test position through the positioning circle sticker 18. The fixing clamp fixes the experimental plate 7 on the placement table 6 through the clamping arm. The clamping arm provides a clamping force through the spring piece and locks the position through the locking bolt. The raised edge of the experimental plate 7 prevents the diaphragm from sliding out, and the grid-like grooves help with heat dissipation. Subsequently, start the hierarchical voltage generation module 3. The first voltage generation unit 15 generates a lower voltage and transmits it to the voltage output terminal through the voltage transmission channel 14. The conductive contact contacts the diaphragm on the experimental plate 7 for a preliminary test. Adjust the position of the conductive contact through the adjustment knob to adapt to different test areas. After the test is completed, adjust the position of the frame body 9 through the rotating pair to rotate the experimental plate 7 to the next test area and repeat the above steps. When it is necessary to adjust the test height, adjust the height of the rotating shaft frame 1 through the lifting column 11 to change the vertical position of the experimental plate 7. The damping mechanism of the limit rotating shaft 12 controls the rotation range of the rotating shaft frame 1 to ensure the stability during the test. The reinforcing ribs of the support cross-frame 4 improve the overall strength to ensure the stability of the device during the test. Through the above steps, the ultimate breakdown voltage performance of the lithium battery diaphragm can be comprehensively evaluated, and the accurate test of the overall performance of the diaphragm can be realized to meet the actual application requirements.

[0027] To enable relevant personnel in the technical field to better understand and implement the present invention, the following supplements the specific implementation principle of the present invention in combination with a specific application scenario.

[0028] First, place the lithium battery separator to be tested flat on the experimental plate 7, and clearly mark the test position through the positioning round sticker 18. The clamping arm of the fixing fixture applies a clamping force under the action of the spring piece, and at the same time, the position of the clamping arm is locked by using the locking bolt to ensure that the experimental plate 7 does not displace during the test. The edge of the experimental plate 7 is provided with a raised edge, which can effectively prevent the separator from slipping out during the test, while the grid-shaped grooves on the surface of the experimental plate 7 are used to guide the heat generated during the test to dissipate, avoiding the distortion of the test results caused by heat accumulation.

[0029] Subsequently, start the first voltage generation unit 15 in the hierarchical voltage generation module 3, which generates a lower initial test voltage. This voltage is transmitted to the voltage output end through the voltage transmission channel 14, and the conductive contact touches the separator on the experimental plate 7, thereby completing the preliminary withstand voltage performance test. During this process, the adjustment knob can adjust the position of the conductive contact according to needs to adapt to the test requirements of different regions.

[0030] After the test is completed, rotate the position of the experimental plate 7 to the next test area by rotating the secondary adjustment frame 9, and repeat the above steps until all key test positions of the separator are covered.

[0031] When it is necessary to test different heights of the separator, the height of the rotating shaft frame 1 can be adjusted by the lifting column 11, thereby changing the vertical position of the experimental plate 7. The damping mechanism in the limit rotating shaft 12 controls the rotation range of the rotating shaft frame 1 through the limit groove, ensuring that it rotates stably between 0° and 90°, and avoiding affecting the test accuracy due to excessive deflection. The mounting plate 2 rotates freely relative to the rotating shaft frame 1 through the bearing assembly, and the balls in the sliding track further reduce the friction between the two, making the rotation of the mounting plate 2 smoother and more stable.

[0032] In addition, the reinforcing ribs of the supporting cross frame 4 significantly improve the strength of the overall structure, ensuring that the device remains stable during the test. Threads are provided in the connection holes at both ends of the cross beam, which are matched with the bolts on the frame 9 to achieve a firm connection, further enhancing the overall rigidity of the device. The experimental plate 7 is made of a high-temperature resistant insulating material, which can maintain good insulation performance in a high-voltage test environment. At the same time, the grid-shaped grooves on its surface promote heat dissipation and avoid the influence of local overheating on the test results.

[0033] Through the above steps, the present invention realizes a comprehensive evaluation of the ultimate breakdown voltage of lithium battery diaphragms, and solves the problem in the prior art that only local areas can be tested. The hierarchical voltage generation module 3 generates voltages of different levels. Combining with the flexible adjustment function of the voltage output end, it can accurately simulate various working states of the diaphragm in actual use. The horizontal rotation and vertical adjustment functions of the loading rack group 5 ensure flexibility and stability during the test process, thus meeting the accurate evaluation requirements for the overall performance of the diaphragm in practical applications.

[0034] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0035] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hierarchical simulation device for the ultimate breakdown voltage of a lithium-ion battery separator, characterized in that It includes at least a hierarchical voltage generation module (3), a mounting disk (2), a rotating shaft frame (1), a supporting cross frame (4), a loading rack group (5), and a voltage output terminal; wherein, the mounting disk (2) is fixedly connected to the hierarchical voltage generation module (3), the rotating shaft frame (1) is rotatably connected to the mounting disk (2), the supporting cross frame (4) is fixedly attached to the bottom of the mounting disk (X), the loading rack group (5) is rotatably connected to the supporting cross frame (4), and the voltage output terminal is movably connected to the bottom of the hierarchical voltage generation module (3).

2. The device according to claim 1, characterized in that The hierarchical voltage generation module (3) includes at least a first voltage generation unit (15), a second voltage generation unit (16), and a third voltage generation unit (17), the output voltage of the first voltage generation unit (15) is lower than the output voltage of the second voltage generation unit (16), and the output voltage of the second voltage generation unit (16) is lower than the output voltage of the third voltage generation unit (17).

3. The device according to claim 1, characterized in that, The loading rack group (5) includes a rack body (9), a fixed platform (10) connected to the rack body (9), a placement table (6), and an experimental disk (7); the fixed platform (10) is fixedly connected to the placement table (6), the placement table (6) is detachably connected to the experimental disk (7), and the experimental disk (7) is used for placing the lithium battery separator to be tested.

4. The device according to claim 3, characterized in that, A plurality of positioning round stickers (18) are attached to the end face of the experimental disk (7), a raised edge is provided at the edge of the experimental disk (7), and a grid-shaped groove is provided on the surface of the experimental disk (7).

5. The device according to claim 1, wherein, A base (8) is fixedly connected to the bottom of the rotating shaft frame (1), a lifting column (11) is provided between the base (8) and the rotating shaft frame (1), a limiting rotating shaft (12) is provided inside the rotating shaft frame (1), and the limiting rotating shaft (12) is connected to the rotating shaft frame (1) through a limiting groove.

6. The device according to claim 1, characterized in that A bearing assembly is provided between the mounting disk (2) and the rotating shaft frame (1), the bearing assembly includes an outer ring, an inner ring, and rolling elements, the outer ring is fixedly connected to the rotating shaft frame (1), and the inner ring is fixedly connected to the mounting disk (2).

7. The device according to claim 1, characterized in that, The voltage output terminal includes at least a conductive contact, an insulating housing, and an adjustment knob, the conductive contact is connected to a voltage transmission channel (14), the insulating housing wraps the conductive contact, and the adjustment knob is used to adjust the position of the conductive contact.

8. The device according to claim 3, characterized in that, The loading rack group (5) further includes a plurality of fixing clamps, the fixing clamps include clamping arms, spring pieces, and locking bolts, the clamping arms are hinged to the placement table (6), and the spring pieces are provided between the clamping arms and the placement table (6).

9. The device according to claim 1, characterized in that The supporting cross frame (4) includes a cross beam and reinforcing ribs, the cross beam is fixedly attached to the bottom of the mounting disk (2), the reinforcing ribs are provided between the cross beams, connection holes are provided at both ends of the cross beam, and threads are provided in the connection holes.

10. The device according to claim 5, characterized in that, A damping mechanism is provided in the limiting groove, the damping mechanism is used to control the rotation resistance of the limiting rotating shaft (12), and the rotation angle of the limiting rotating shaft (12) is 0° - 90°.

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