A hierarchical simulation device for the limit breakdown voltage of a lithium battery separator

Abstract

The utility model relates to lithium battery safety test and material performance evaluation technical field especially relates to a kind of hierarchical simulation device of the limit breakdown voltage of lithium battery separator, it includes hierarchical voltage generation module, mounting disc, pivot frame, support cross frame, load rack group and voltage output end, hierarchical voltage generation module generates multiple voltage, and the separator is comprehensively tested by voltage output end;Load rack group can be rotatably adjusted, and the test of separator different position is realized;Limit pivot and lifting column ensure test stability and flexibility.Experimental disc is provided with grid groove and positioning round patch, and optimization test positioning and heat dissipation performance.The utility model can comprehensively evaluate the overall voltage resistance performance of separator, solve the partial test limitation, have higher practical value and technical advantage.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery safety testing and material performance evaluation technology, and in particular to a layer simulation device for the ultimate breakdown voltage of lithium battery separators. Background Technology

[0002] In lithium-ion batteries, the primary function of the separator is to separate the positive and negative electrodes, preventing short circuits caused by contact between them. During battery manufacturing, dust and burrs from the positive and negative electrode materials can potentially cause short circuits. Therefore, lithium-ion battery manufacturers typically perform high-voltage testing after cell assembly to detect short circuits and identify cells with potential problems. Currently, the voltage withstand performance of separators is mostly tested using static methods. Specifically, a separator is placed on a metal platform, and a metal plate or rod is placed on top of it. The metal platform and the metal plate or rod are then connected to a breakdown voltage tester to measure the voltage required to break down the separator.

[0003] However, the aforementioned methods can only test local areas of the diaphragm and cannot fully reflect the actual voltage withstand performance of the entire diaphragm surface. Utility Model Content

[0004] The purpose of this invention is to provide a hierarchical simulation device for the ultimate breakdown voltage of lithium battery separators, in order to solve the technical problem that the existing technology can only perform voltage withstand tests on local areas of the separator and cannot fully reflect the overall ultimate breakdown performance of the separator.

[0005] This utility model provides a tiered simulation device for the ultimate breakdown voltage of a lithium battery separator, comprising at least a tiered voltage generating module, a mounting plate, a rotating shaft frame, a support crossbar, a loading frame assembly, and a voltage output terminal; wherein, the mounting plate is fixedly connected to the tiered voltage generating module, the rotating shaft frame is rotatably connected to the mounting plate, the support crossbar is fitted and fixed to the bottom of the mounting plate, the loading frame assembly is rotatably connected to the support crossbar, and the voltage output terminal is movably connected to the bottom of the tiered voltage generating module.

[0006] In some embodiments, the hierarchical voltage generating module includes at least a first voltage generating unit, a second voltage generating unit, and a third voltage generating unit, wherein the output voltage of the first voltage generating unit is lower than the output voltage of the second voltage generating unit, and the output voltage of the second voltage generating unit is lower than the output voltage of the third voltage generating unit.

[0007] In some embodiments, the loading rack assembly includes a frame, a fixed platform connected to the frame, a placement platform, and an experimental tray; the fixed platform is fixedly connected to the placement platform, the placement platform is detachably connected to the experimental tray, and the experimental tray is used to place the lithium battery separator to be tested.

[0008] In some embodiments, the experimental tray has multiple positioning circular stickers attached to its end face, the edge of the experimental tray has raised guards, and the surface of the experimental tray has a grid-like groove.

[0009] In some embodiments, a first base is fixedly connected to the bottom of the rotating shaft frame, a lifting column is provided between the first base and the rotating shaft frame, a limiting rotating shaft is provided inside the rotating shaft frame, and the limiting rotating shaft is connected to the rotating shaft frame through a limiting groove.

[0010] In some embodiments, a bearing assembly is provided between the mounting plate 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 plate.

[0011] In some embodiments, the voltage output terminal includes at least a conductive contact, an insulating shell, and an adjustment knob. The conductive contact is connected to a voltage transmission channel, the insulating shell covers the conductive contact, and the adjustment knob is used to adjust the position of the conductive contact.

[0012] In some embodiments, the loading rack assembly further includes a plurality of fixing clamps, each fixing clamp including a clamping arm, a spring plate and a locking bolt, wherein the clamping arm is hinged to the placement platform and the spring plate is disposed between the clamping arm and the placement platform.

[0013] In some embodiments, the support crossbeam includes a crossbeam and reinforcing ribs. The crossbeam is fixedly attached to the bottom of the mounting plate, the reinforcing ribs are disposed between the crossbeams, and the two ends of the crossbeam are provided with connecting holes, and the connecting holes are provided with threads.

[0014] In some embodiments, a damping mechanism is provided in the limiting groove, the damping mechanism being used to control the rotational resistance of the limiting shaft, the rotation angle of the limiting shaft being 0°-90°.

[0015] Compared with the prior art, this invention has the following advantages: This invention generates voltages of different levels through a tiered voltage generation module and performs comprehensive testing of the diaphragm using the voltage output terminal, solving the problem that existing technologies can only perform ultimate breakdown voltage testing on local areas of the diaphragm. Simultaneously, the rotation and adjustment functions of the loading frame assembly enable testing at different positions of the diaphragm. The design of the limiting shaft and lifting column ensures stability and flexibility during the testing process. The technical solution of this invention can accurately evaluate the overall voltage withstand performance of lithium-ion battery diaphragms in practical applications, possessing high practical value and technical advantages. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an isometric schematic diagram of the hierarchical simulation device of this utility model;

[0018] Figure 2 This is a front view schematic diagram of the hierarchical simulation device of this utility model;

[0019] Figure 3 This is a schematic diagram of the positioning circle sticker of the hierarchical simulation device of this utility model.

[0020] In the picture:

[0021] 1-Spindle frame; 2-Mounting plate; 3-Tier voltage generating module; 4-Supporting crossbar; 5-Placement frame assembly; 6-Placement platform; 7-Experimental tray; 8-Base; 9-Frame body; 10-Fixing platform; 11-Lifting column; 12-Limiting pivot; 13-Auxiliary support seat; 14-Voltage transmission channel; 15-First voltage generating unit; 16-Second voltage generating unit; 17-Third voltage generating unit; 18-Positioning circle; (Attached) Figure 1 - Appendix Figure 2 Dashed lines are used as guides to avoid interference with technical features. Detailed Implementation

[0022] The following will refer to the appendix in the embodiments of this utility model. Figure 1-3 The technical solutions in the embodiments of this utility model will be clearly and completely described together. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0023] Example

[0024] The specific embodiments of this utility model are described in detail with reference to the accompanying drawings to ensure the completeness and operability of the technical solution. For example... Figure 1As shown, a layered simulation device for the ultimate breakdown voltage of a lithium battery separator is provided, comprising at least a layered voltage generating module 3, a mounting plate 2, a rotating shaft frame 1, a support crossbeam 4, a loading frame assembly 5, and a voltage output terminal. The mounting plate 2 is fixedly connected to the layered voltage generating module 1, the rotating shaft frame 1 is rotatably connected to the mounting plate 2, the support crossbeam 4 is fixedly attached to the bottom of the mounting plate 2, the loading frame assembly 5 is rotatably connected to the support crossbeam 4, and the voltage output terminal is movably connected to the bottom of the layered voltage generating module 1. Preferably, the layered voltage generating module 1 is fixedly connected to an auxiliary support base 13, which is used to maintain the stability of the layered voltage generating module 3. The layered voltage generating module 3 includes at least a first voltage generating unit 15, a second voltage generating unit 16, and a third voltage generating unit 17. The output voltage of the first voltage generating unit 15 is lower than the output voltage of the second voltage generating unit 16, and the output voltage of the second voltage generating unit 16 is lower than the output voltage of the third voltage generating unit 17. A voltage transmission channel 14 is provided between the hierarchical voltage generating module 3 and the voltage output terminal. The voltage transmission channel 14 is used to transmit the voltage generated by the hierarchical voltage generating module 3 to the voltage output terminal.

[0025] The mounting frame assembly 5 includes a frame 9, a fixed platform 10 connected to the frame 9, a placement platform 6, and a test tray 7. The fixed platform 10 is fixedly connected to the placement platform 6, and the placement platform 6 is detachably connected to the test tray 7. The test tray 7 is used to place the lithium battery separator to be tested. Multiple positioning circular stickers 18 are affixed to the end face of the test tray 7. These positioning circular stickers 18 are used to mark the test position of the separator and assist in positioning operations during the testing process. A rotating joint is provided between the frame 9 and the supporting crossbeam 4, allowing the frame 9 to rotate horizontally to adjust the position of the test tray 7.

[0026] The bottom of the rotating shaft frame 1 is fixedly connected to the base 8. A lifting column is provided between the base 8 and the rotating shaft frame 1 to adjust the height of the rotating shaft frame 1. A limiting rotating shaft 12 is provided inside the rotating shaft frame 1 to limit the rotation range of the rotating shaft frame 1, with a rotation angle of 0° to 90°. The limiting rotating shaft 12 is connected to the rotating shaft frame 1 through a limiting groove. A damping mechanism is provided in the limiting groove to control the rotational resistance of the limiting rotating shaft 12.

[0027] 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 and inner rings. 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 rail is provided at the bottom of the mounting plate 2, which is slidably connected to the support crossbeam 4. Ball bearings are provided in the sliding rail to reduce the friction between the mounting plate 2 and the support crossbeam 4.

[0028] The voltage output terminal includes conductive contacts, an insulating shell, and an adjustment knob. The conductive contacts are connected to the voltage transmission channel 14, the insulating shell covers the conductive contacts, and the adjustment knob is used to adjust the position of the conductive contacts.

[0029] The voltage output terminal is connected to the tiered voltage generating module 3 via a universal joint. The universal joint allows the voltage output terminal to swing freely within a certain range to adapt to the needs of different test positions. The mounting frame assembly 5 also includes multiple fixing clamps. The fixing clamps are used to fix the test disk 7 onto the placement platform 6. The fixing clamps include clamping arms, spring plates, and locking bolts. The clamping arms are hinged to the placement platform 6, the spring plates are located between the clamping arms and the placement platform 6, and the locking bolts are used to fix the position of the clamping arms. The ends of the clamping arms are provided with anti-slip pads to increase the friction between the clamping arms and the test disk 7 and prevent the test disk 7 from shifting during the test.

[0030] The supporting crossbeam 4 includes a crossbeam and reinforcing ribs. The crossbeam is fixedly attached to the bottom of the experimental tray 7, and the reinforcing ribs are placed between the crossbeams to improve the overall strength of the supporting crossbeam 4. Connecting holes are provided at both ends of the crossbeam for connection to the frame 9. Threads are provided in the connecting holes to engage with bolts on the frame 9 to achieve a fixed connection between the supporting crossbeam 4 and the frame 9. The experimental tray 7 is made of high-temperature resistant insulating material. The surface of the experimental tray 7 has a grid-like groove to guide the dissipation of heat generated during the test, preventing heat accumulation from affecting the test results. Raised edges are provided on the edges of the experimental tray 7 to prevent the diaphragm from slipping out of the experimental tray 7 during the test.

[0031] In practical applications, firstly, the lithium battery separator to be tested is placed on the test tray 7, and the test position is marked by the positioning circle 18. The fixing fixture secures the test tray 7 to the placement platform 6 through the clamping arm. The clamping arm provides clamping force through spring plates and locks the position with locking bolts. The raised edge of the test tray 7 prevents the separator from slipping out, and the grid-like grooves help with heat dissipation. Subsequently, the hierarchical voltage generation module 3 is activated. The first voltage generation unit 15 generates a lower voltage, which is transmitted to the voltage output terminal through the voltage transmission channel 14. The conductive contact contacts the separator on the test tray 7 for preliminary testing. The position of the conductive contact is adjusted by adjusting the knob to adapt to different test areas. After the test is completed, the position of the frame 9 is adjusted by rotating the joint to rotate the test tray 7 to the next test area and repeat the above steps. When it is necessary to adjust the test height, the height of the rotating shaft frame 1 is adjusted by the lifting column 11 to change the vertical position of the test tray 7. The damping mechanism of the limiting rotating shaft 12 controls the rotation range of the rotating shaft frame 1 to ensure stability during the test. The reinforcing ribs supporting the crossbeam 4 enhance overall strength and ensure the stability of the device during testing. Through the above steps, the ultimate breakdown voltage performance of the lithium battery separator can be comprehensively evaluated, enabling accurate testing of the overall separator performance to meet practical application requirements.

[0032] To enable those skilled in the art to fully understand and implement this utility model, the following supplementary explanation of the specific implementation principle of this utility model is provided in conjunction with a specific application scenario.

[0033] First, the lithium battery separator to be tested is placed flat on the test tray 7, and the test position is clearly marked using the positioning circular stickers 18. The clamping arms of the fixing fixture apply clamping force under the action of spring plates, and the position of the clamping arms is locked using locking bolts to ensure that the test tray 7 will not shift during the test. The edges of the test tray 7 are provided with raised guards to effectively prevent the separator from slipping out during the test, while the grid-like grooves on the surface of the test tray 7 are used to guide the heat generated during the test to dissipate, avoiding the distortion of test results due to heat accumulation.

[0034] Subsequently, the first voltage generating unit 15 in the hierarchical voltage generating module 3 is activated, which generates a low initial test voltage. This voltage is transmitted to the voltage output terminal through the voltage transmission channel 14, and the conductive contacts make contact with the diaphragm on the test plate 7, thereby completing the preliminary withstand voltage performance test. During this process, the adjustment knob can be used to adjust the position of the conductive contacts as needed to adapt to the testing requirements of different areas.

[0035] After the test is completed, the position of the frame 9 is adjusted by rotating the joint to rotate the test plate 7 to the next test area, and the above steps are repeated until all the key test positions of the diaphragm are covered.

[0036] When testing different diaphragm heights is required, the height of the rotating frame 1 can be adjusted via the lifting column 11, thereby changing the vertical position of the test disc 7. The damping mechanism within the limiting rotating shaft 12 controls the rotation range of the rotating frame 1 through the limiting groove, ensuring stable rotation between 0° and 90° and preventing excessive deflection from affecting test accuracy. The mounting disc 2 rotates freely relative to the rotating frame 1 via the bearing assembly, and the ball bearings in the sliding track further reduce the friction between the two, making the rotation of the mounting disc 2 smoother and more stable.

[0037] Furthermore, the reinforcing ribs supporting the crossbeam 4 significantly improve the overall structural strength, ensuring the device remains stable during testing. The connecting holes at both ends of the crossbeam are threaded, engaging with the bolts on the frame 9 for a secure connection, further enhancing the overall rigidity of the device. The experimental tray 7 is made of high-temperature resistant insulating material, maintaining excellent insulation performance under high-voltage testing conditions. Simultaneously, its surface features a grid-like groove that promotes heat dissipation, preventing localized overheating from affecting the test results.

[0038] Through the above steps, this invention achieves a comprehensive evaluation of the ultimate breakdown voltage of lithium battery separators, solving the problem that existing technologies can only test local areas. The tiered voltage generation module 3 generates voltages of different levels, and combined with the flexible adjustment function of the voltage output terminal, it can accurately simulate various working states of the separator in actual use. The horizontal rotation and vertical adjustment functions of the mounting frame assembly 5 ensure flexibility and stability during the testing process, thereby meeting the needs of accurate evaluation of the overall performance of the separator in practical applications.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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 battery separator, characterized in that, It includes at least a tiered voltage generating module (3), a mounting plate (2), a rotating frame (1), a supporting crossbeam (4), a loading frame assembly (5), and a voltage output terminal; wherein, the mounting plate (2) is fixedly connected to the tiered voltage generating module (3), the rotating frame (1) is rotatably connected to the mounting plate (2), the supporting crossbeam (4) is fitted and fixed to the bottom of the mounting plate (2), the loading frame assembly (5) is rotatably connected to the supporting crossbeam (4), and the voltage output terminal is movably connected to the bottom of the tiered voltage generating module (3).

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

3. The apparatus according to claim 1, characterized in that, The loading rack assembly (5) includes a frame (9), a fixed platform (10) connected to the frame (9), a placement platform (6), and an experimental tray (7); the fixed platform (10) is fixedly connected to the placement platform (6), the placement platform (6) is detachably connected to the experimental tray (7), and the experimental tray (7) is used to place the lithium battery separator to be tested.

4. The apparatus according to claim 3, characterized in that, The experimental disk (7) has multiple positioning round stickers (18) attached to its end face, and the edge of the experimental disk (7) is provided with raised guards and the surface of the experimental disk (7) is provided with grid-like grooves.

5. The apparatus according to claim 1, characterized in that, The bottom of the rotating shaft frame (1) is fixedly connected to the base (8), and 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 apparatus according to claim 1, characterized in that, 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), and the inner ring is fixedly connected to the mounting plate (2).

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

8. The apparatus according to claim 3, characterized in that, The loading rack assembly (5) also includes multiple fixing clamps, each of which includes a clamping arm, a spring plate, and a locking bolt. The clamping arm is hinged to the placement table (6), and the spring plate is disposed between the clamping arm and the placement table (6).

9. The apparatus according to claim 1, characterized in that, The supporting crossbeam (4) includes a crossbeam and a reinforcing rib. The crossbeam is fixed to the bottom of the mounting plate (2). The reinforcing rib is disposed between the crossbeams. The two ends of the crossbeam are provided with connecting holes, and the connecting holes are provided with threads.

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

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