Device for testing bonding effect of glued diaphragm and pole piece

Abstract

The invention discloses a gluing diaphragm and pole piece bonding effect testing device, which comprises an upper pressing support assembly, a lower pressing assembly and a platform control assembly, and is characterized in that the upper pressing support assembly is used for supporting a prefabricated body participating in a test; the downward pressing assembly follows the press machine and applies downward pressure to the prefabricated body supported by the upward pressing supporting assembly; the platform control assembly regulates and controls the upper pressing supporting assembly to support the prefabricated body through the shaft connecting assembly and fixes the position of the prefabricated body. According to the invention, the gluing diaphragms and the pole piece preforms are used as test workpieces to be placed on the upper pressing support assembly, centering and clamping of the workpieces can be controlled through the servo control mobile platform according to the gluing diaphragms and the pole piece preforms with different models and sizes, and the lower pressing assembly applies pressure downwards; the yield force value of the glued diaphragm and the pole piece preform is tested, the bonding effect of the glued diaphragm and the pole piece is tested, and a test basis is provided for optimization of a battery cell manufacturing process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of testing the bonding effect of a coated separator and a pole piece, and particularly relates to a device for testing the bonding effect of a coated separator and a pole piece. BACKGROUND

[0002] With the aggravation of global energy crisis and environmental pollution, lithium ion batteries, as one of the main development directions in the field of new energy, are widely used in new energy vehicles and power sources, etc. due to their high energy density, long cycle life, green and pollution-free advantages. The structure of a lithium ion battery mainly includes an internal cell, an electrolyte, a shell and a battery cover plate, wherein the internal cell is usually preformed by winding or stacking the positive pole piece, the separator and the negative pole piece.

[0003] The compaction density of the positive pole piece, the adhesion of the separator to the positive and negative pole pieces, and the cell formed by different hot pressing processes all affect the structural strength of the preformed cell, i.e. the shaping effect of the cell. The structural strength of the cell is directly related to the subsequent manufacturing process of the battery. If the structural strength is insufficient, the cell is prone to damage or deformation during the assembly, shell insertion and transfer process between processes, making it difficult to proceed with production.

[0004] However, at present, there is still a lack of effective testing methods and devices to accurately evaluate and predict the influence of the compaction density of the positive and negative pole pieces, the adhesion of the separator to the pole piece and different hot pressing processes on the shaping effect of the cell, which to some extent restricts the optimization of the lithium battery cell manufacturing process and the improvement of product quality.

[0005] For example, the application number 202410496151.4 discloses a method for testing the bonding force of a coated separator. The application has high accuracy and can test the bonding force of coated separators with different types of glue and different amounts of glue. However, the application also has the following problems: the testing principle focuses on peel strength, which can only reflect the mechanical properties of the coated separator and the pole piece during separation, but cannot simulate the compressive stress experienced by the cell during actual manufacturing and use. It is difficult to relate to the overall structural strength and shaping effect of the cell, and it is difficult to meet the comprehensive needs of evaluating the structural strength of the cell in the optimization of the lithium battery manufacturing process.

[0006] Therefore, there is a need for a device for testing the bonding effect of a coated separator and a pole piece, which can comprehensively consider the compaction density of the positive and negative pole pieces, the adhesion of the separator to the pole piece and different hot pressing processes, and accurately evaluate and predict the shaping effect of the cell. SUMMARY

[0007] In view of the above problems, the present application provides a device for testing the bonding effect of a coated separator and a pole piece, which solves the problem of lacking effective testing means for the bonding effect of a coated separator and a pole piece in the prior art.

[0008] The object of the present application can be achieved by the following technical solutions: a device for testing the bonding effect of a rubber-coated diaphragm and a pole piece, comprising:

[0009] An upper pressing support assembly is arranged on the pressure platform and used for supporting a prefabricated body participating in the test;

[0010] A lower pressing assembly is connected to the pressing machine and follows the pressing machine to apply downward pressure to the prefabricated body supported by the upper pressing support assembly and perform pressure testing on the prefabricated body;

[0011] A platform control assembly regulates the prefabricated body supported by the upper pressing support assembly through the shaft connecting assembly.

[0012] As a further improvement of the present application, the upper pressing support assembly comprises two upper pressing heads, each of which is connected with an upper pressing head seat, and the upper pressing head seat is arranged in the upper pressing head sliding groove of the pressure platform and forms a sliding fit with the upper pressing head sliding groove.

[0013] As a further improvement of the present application, the platform control assembly comprises:

[0014] A distance adjusting piece is used for adjusting the distance between the two upper pressing heads;

[0015] A baffle support piece is used for adjusting the distance between the two baffles and supporting the prefabricated body with the baffles;

[0016] A stretching fixing piece is used for stretching and fixing the prefabricated body supported by the baffles.

[0017] As a further improvement of the present application, the baffles are arranged in the baffle sliding groove of the pressure platform and form a sliding fit with the baffle sliding groove.

[0018] As a further improvement of the present application, the distance adjusting piece comprises:

[0019] A servo motor one drives a screw rod group one, and the two opposite rotating screw rods of the screw rod group one form screw pairs with the upper pressing head seats respectively, so that the two upper pressing head seats move towards each other along the upper pressing head sliding groove.

[0020] As a further improvement of the present application, the baffle support piece comprises:

[0021] A servo motor two drives a screw rod group two, and the two opposite rotating screw rods of the screw rod group two form screw pairs with the baffles respectively, so that the two baffles move towards each other along the baffle sliding groove.

[0022] As a further place of the present application, the baffle support further comprises a third screw rod set connected with the second screw rod set through a chain, and the two opposite rotating screw rods of the third screw rod set form screw rod pairs with the baffle.

[0023] As a further place of the present application, the stretching fixing part comprises four springs and sliders, the sliders slide in the slider grooves at the top end of the baffle, one end of the spring is fixed on the baffle, and the other end stretches the slider inward, a single spring and a slider form a clamping structure, and two sets of clamping structures are symmetrically distributed on one side of the baffle to clamp the width direction of the preform.

[0024] As a further place of the present application, the pressure platform is provided with a scale on the side to detect the test interval.

[0025] The beneficial effects of the present application are:

[0026] 1. The present application places the rubber-coated diaphragm and the pole piece preform as test workpieces on the upper pressing support assembly, and the servo-controlled moving platform can control the centering and clamping of the preform for different models and sizes of preforms, the lower pressing assembly applies pressure downward, tests the yield strength value of the rubber-coated diaphragm and the pole piece preform, and tests the bonding effect of the rubber-coated diaphragm and the pole piece, directly relates to the stress state of the battery cell in manufacturing and use, realizes comprehensive evaluation of structural strength, bonding effect and shaping effect, the whole test device has simple structure and convenient operation, and provides key test basis for battery cell manufacturing process optimization.

[0027] 2. The present application can flexibly adapt to preforms of different lengths, widths, stacking numbers or winding lengths through the servo motor driven screw rod sets, and can complete diversified tests without replacing core components. With the help of precisely adjustable test interval and pressure parameters, the stress environment of the battery cell in different processes such as assembly and shell entering can be simulated, and the test result is closer to the actual production demand.

[0028] 3. The cooperation of the servo motor and the screw rod set realizes high-precision control of the interval, supplemented by the intuitive monitoring of the scale, and the quantitative control of the pressure application is realized through the linkage of the press, reducing the manual operation error. At the same time, the stretching fixing part adopts the symmetrical clamping design of the spring and the slider, which can adaptively clamp workpieces of different sizes and avoid damage to the workpieces caused by excessive extrusion, ensure that the workpieces do not displace and shake during the test process, ensure uniform pressure transmission, and ensure stable and reliable test data.

[0029] 4. The upper pressing support assembly, the lower pressing assembly, and the platform control assembly of the present application have clear division of labor, compact structure, and are easy to assemble, maintain, and adapt to different types of presses, thereby reducing equipment investment cost. Through linkage control of the servo motor and the press, the test operation steps are simplified, and the operator can quickly get started without complex training, which can greatly improve batch test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 FIG. 1 is a structural schematic diagram of the adhesive effect testing device of the present application;

[0031] Figure 2 FIG. 4 is a structural schematic diagram of the spacing adjusting member of the present application;

[0032] Figure 3 FIG. 5 is a structural schematic diagram of the baffle support member of the present application;

[0033] Figure 4 FIG. 6 is a structural schematic diagram of the stretching fixing member of the present application;

[0034] Figure 5 FIG. 7 is a structural schematic diagram of the rubberized diaphragm and the pole piece preform of the present application.

[0035] 100, upper pressing support assembly; 110, upper pressing head; 120, upper pressing head seat;

[0036] 200, lower pressing assembly; 210, lower pressing head;

[0037] 300, platform control assembly; 310, spacing adjusting member; 311, servo motor one; 312, screw rod group one; 313, bearing seat; 320, baffle support member; 321, baffle; 322, servo motor two; 323, screw rod group two; 324, screw rod group three; 325, chain; 330, stretching fixing member; 331, spring; 332, sliding block;

[0038] 400, pressure platform; 410, upper pressing head sliding groove; 420, baffle sliding groove; 430, scale;

[0039] 500, preform. DETAILED DESCRIPTION

[0040] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar symbols represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0041] The compaction density of the positive and negative electrode sheets, the adhesion between the separator and the electrode sheet, and different hot pressing processes have an impact on the shaping effect of the battery cell. However, there is currently a lack of effective testing devices to accurately evaluate and predict this impact, which to some extent restricts the optimization of the lithium battery cell manufacturing process and the improvement of product quality.

[0042] Embodiment 1:

[0043] In view of the above problems, the present embodiment discloses a device for testing the adhesion effect of the coated separator and the electrode sheet, as shown in Figure 1 The device includes an upper pressing support assembly 100, a lower pressing assembly 200, and a platform control assembly 300.

[0044] The structure of the preform 500 is shown in Figure 1 and Figure 5 The preform 500 is formed by the adhesion of the coated separator and the electrode sheet, Figure 5 a is the preform 500 formed by stacking the coated separator and the positive and negative electrode sheets, Figure 5 b is the preform 500 formed by winding, and the number of stacked layers of the coated separator and the electrode sheet is not limited or the winding length is not limited.

[0045] The upper pressing support assembly 100 is arranged on the pressure platform 400 and is used to support the preform 500 involved in the test. The lower pressing assembly 200 includes a lower pressing head 210, which is connected to the pressing machine through an upper connecting shaft. The lower pressing head 210 follows the pressing machine and applies downward pressure to the preform 500 supported by the upper pressing support assembly 100, thereby performing pressure testing on the preform 500. The yield strength value of the coated separator and the electrode sheet preform can be tested, and the adhesion effect of the coated separator and the electrode sheet can be tested. The platform control assembly 300 regulates the preform 500 supported by the upper pressing support assembly 100 through a shaft connecting assembly and fixes the position of the preform 500. The shaft connecting assembly includes a screw rod group one 312, a screw rod group two 323, and a screw rod group three 324.

[0046] Further, the platform control assembly 300 includes a spacing adjusting member 310, a baffle support member 320, and a stretching fixing member 330.

[0047] The spacing adjusting member 310 is used to adjust the spacing between the two upper pressing heads 110 to form different test spacings, thereby meeting the test requirements of preforms 500 of different sizes. Through accurate spacing adjustment, the adhesion of the coated separator and the electrode sheet under various working conditions in actual production can be simulated, thereby improving the accuracy and reliability of the test results.

[0048] The baffle support 320 is used to adjust the distance between the two baffles 321, adapt to different specifications of the prefabricated body 500, and support the prefabricated body 500 by the baffles 321, so as to form a stable support for the prefabricated body 500 and facilitate accurate pressure testing of the prefabricated body 500.

[0049] The stable structure of the baffle support 320 can ensure that the prefabricated body 500 is not easily displaced or shaken during testing, thereby ensuring the accuracy and reliability of the test data. By adjusting the distance between the two baffles 321, different sizes and shapes of the prefabricated body 500 can be adapted, improving the versatility and applicability of the testing device. In addition, the support of the baffles 321 can also disperse the pressure and avoid additional damage to the prefabricated body 500 caused by pressure concentration, ensuring that the test results can truly reflect the bonding effect of the rubberized diaphragm and the pole piece.

[0050] The stretching fixing part 330 is used to stretch and fix the prefabricated body 500 supported by the baffle 321, so that the prefabricated body 500 is fixed on the baffle 321, and the support of the baffle 321 on the prefabricated body 500 is more stable, further enhancing the stability of the prefabricated body 500 during testing. The stretching fixing part 330 can adjust the size of the stretching force according to the characteristics of the prefabricated body 500 and the testing requirements, so as to ensure that the prefabricated body 500 will not be excessively deformed or damaged when stretched.

[0051] With the above structure, the upper pressing support assembly 100 stably supports the prefabricated body 500, providing a solid foundation for testing, ensuring the stability of the workpiece during testing, and ensuring the accuracy of the test. The lower pressing assembly 200 is connected to the press, and can accurately apply downward pressure according to actual needs, which can simulate the pressure condition of the rubberized diaphragm and the pole piece under different working conditions. The platform control assembly 300 adjusts the upper pressing support assembly 100, which not only adjusts the test distance, but also firmly fixes it, further improving the stability and reliability of the test.

[0052] Embodiment 2:

[0053] Based on embodiment 1, the present embodiment discloses a bonding effect testing device for a rubberized diaphragm and a pole piece, further forming an implementation scheme of the structure and connection of each component, in particular:

[0054] The pressure platform 400 is connected to the machine table through the lower connecting shaft, providing a working support platform for other components. The upper pressing support assembly 100 and the platform control assembly 300, as well as the shaft connecting assembly, are all arranged on the pressure platform 400.

[0055] The pressure platform 400 is provided with an upper pressing head sliding groove 410, and the upper pressing support assembly 100 comprises two upper pressing heads 110, the two upper pressing heads 110 are connected with upper pressing head seats 120 respectively, the upper pressing head seats 120 are provided with sliding blocks at the bottom, the sliding blocks are embedded in the upper pressing head sliding groove 410, so that the upper pressing head seats 120 are in sliding fit with the upper pressing head sliding groove 410.

[0056] The pressure platform 400 is also provided with a baffle sliding groove 420, and the bottom of the baffle 321 is provided with a sliding block, the sliding block is embedded in the baffle sliding groove 420, so that the baffle 321 is in sliding fit with the baffle sliding groove 420.

[0057] As shown in Figure 2 The spacing adjusting part 310 is used for adjusting the spacing of the two upper pressing heads 110, the spacing adjusting part 310 comprises a servo motor one 311, the servo motor one 311 drives a screw rod set one 312, the screw rod set one 312 comprises two screw rods, the distal ends of the two screw rods are connected with the pressure platform 400 through bearing seats 313, the proximal ends of the two screw rods are connected with each other, the two upper pressing head seats 120 are sleeved on the two screw rods respectively, the two screw rods form screw pairs with the upper pressing head seats 120 respectively, under the driving of the servo motor one 311, the upper pressing head seats 120 drive the upper pressing heads 110 to move towards each other along the upper pressing head sliding groove 410, so as to form different test spacings, which is convenient for the bonding effect test of different specifications of rubber-coated diaphragms and pole pieces.

[0058] The test spacing adjusting mode has high precision and stability, can accurately adjust the spacing to the required test value, and ensures the accuracy of the test results.

[0059] As shown in Figure 3 The baffle support part 320 is used for adjusting the spacing of the two baffles 321, the baffle support part 320 comprises a servo motor two 322, the servo motor two 322 drives a screw rod set two 323, the screw rod set two 323 comprises two screw rods, the distal ends of the two screw rods are connected with the pressure platform 400 through bearing seats 313, the proximal ends of the two screw rods are connected with each other, the two baffles 321 are sleeved on the two screw rods respectively, the two screw rods form screw pairs with the baffles 321 respectively, under the driving of the servo motor two 322, the baffles 321 move towards each other along the baffle sliding groove 420, so as to adjust the spacing of the two baffles 321, and adapt to different specifications of the prefabricated bodies 500.

[0060] Further, the baffle support part 320 further comprises a screw rod set three 324, the screw rod set three 324 comprises two screw rods, the distal ends of the two screw rods are connected with the pressure platform 400 through bearing seats 313, the proximal ends of the two screw rods are connected with each other, the two baffles 321 are sleeved on the two screw rods respectively, and the two screw rods form screw pairs with the baffles 321 respectively.

[0061] The third screw rod group 324 is connected with the second screw rod group 323 through the chain 325, and under the driving of the second servo motor 322, the second screw rod group 323 drives the third screw rod group 324 to rotate synchronously through the chain 325, so that the baffle 321 moves towards each other along the baffle sliding groove 420 under the cooperation of the second screw rod group 323 and the third screw rod group 324.

[0062] This way of moving the baffle 321 driven by the second screw rod group 323 and the third screw rod group 324 further enhances the stability and synchronization of the movement of the baffle 321. Compared with single screw rod group driving, double screw rod group synchronous driving can better ensure the consistency of the two baffles 321 during the movement towards each other, and reduce the movement deviation caused by uneven single-sided stress.

[0063] The stretching fixing part 330 is used for stretching and fixing the preform 500 supported by the baffle 321, so that the preform 500 is fixed on the baffle 321. Specifically, as shown in Figure 4

[0064] The stretching fixing part 330 includes four springs 331 and a sliding block 332. The bottom of the sliding block 332 is clamped in the sliding block groove at the top end of the baffle 321, and can slide along the sliding block groove. One end of the spring 331 is fixed on the baffle 321, and the other end stretches the sliding block 332 inward. A single spring 331 and a sliding block 332 form a clamping structure. Each baffle 321 is provided with two clamping structures, and the two clamping structures are symmetrically distributed on one side of the baffle 321. The clamping structure clamps the preform 500 on the baffle 321 in the width direction, so that the preform 500 is fixed on the baffle 321.

[0065] The clamping structure composed of the spring 331 and the sliding block 332 can be self-adaptively adjusted according to the actual size of the preform 500. When the preform 500 is placed on the baffle 321, the stretching force of the spring 331 will make the sliding block 332 slide towards the workpiece direction and tightly fit the side surface of the workpiece. Since the spring 331 has elasticity, it can avoid damaging the preform 500 during clamping. At the same time, the two symmetrically distributed clamping structures can ensure that the preform 500 is uniformly clamped in the width direction, and ensure the stability and balance of the workpiece during the fixing process.

[0066] Further, as shown in Figure 1 The side of the pressure platform 400 is provided with a scale 430 for detecting the test interval. The scale 430 can accurately and intuitively obtain the numerical value of the test interval. When testing the bonding effect of the rubberized diaphragm and the pole piece, the operator can accurately adjust and control the test interval according to the test requirements.

[0067] ​Based on the above structure, the embodiment realizes the bonding effect test of the rubber-coated diaphragm and the pole piece under different distances, can simulate a variety of test distance environments under actual working conditions, and makes the test result more valuable.

[0068] The above merely provides the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

[0069] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact of the first and second features, or indirect contact of the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

Claims

1. A device for testing the bonding effect between an adhesive-coated diaphragm and an electrode sheet, characterized in that, include: The pressure support assembly, set on the pressure platform, is used to support the prefabricated body participating in the test; The lower pressure component is connected to the press and follows the press to apply downward pressure to the precast body supported by the upper pressure support component, and performs a pressure test on the precast body; The platform control component regulates the upper pressure support component to support the precast structure through the shaft connection component.

2. The bonding effect testing device for a coated diaphragm and an electrode sheet according to claim 1, characterized in that, The upper pressure support assembly includes two upper pressure heads, each connected to an upper pressure head seat. The upper pressure head seat is disposed within the upper pressure head groove of the pressure platform, and the upper pressure head seat and the upper pressure head groove form a sliding fit.

3. The bonding effect testing device for a coated diaphragm and an electrode sheet according to claim 2, characterized in that, The platform control components include: The spacing adjustment component is used to adjust the distance between the two upper pressure heads; Baffle support components are used to adjust the distance between two baffles and to support the precast structure using the baffles. Tension fasteners are used to tension and fix the precast structure supported by the baffle.

4. The bonding effect testing device for a coated diaphragm and an electrode sheet according to claim 3, characterized in that, The baffle is installed in the baffle groove of the pressure platform, and the baffle and the baffle groove form a sliding fit.

5. The bonding effect testing device for a coated diaphragm and an electrode sheet according to claim 3, characterized in that, The spacing adjustment component includes: Servo motor one drives lead screw assembly one. The two lead screws of lead screw assembly one rotate in opposite directions and form lead screw pairs with the upper pressure head seats respectively, so that the two upper pressure head seats move in opposite directions along the upper pressure head slide groove.

6. The bonding effect testing device for a coated diaphragm and an electrode sheet according to claim 4, characterized in that, The baffle support includes: Servo motor two drives lead screw assembly two. The two lead screws of lead screw assembly two rotate in opposite directions and form lead screw pairs with baffles respectively, so that the two baffles move in opposite directions along the baffle groove.

7. The bonding effect testing device for a coated diaphragm and an electrode sheet according to claim 6, characterized in that, The baffle support also includes a third lead screw assembly, which is connected to a second lead screw assembly via a chain. The two opposing lead screws of the third lead screw assembly form lead screw pairs with the baffle. Driven by the second servo motor, the second lead screw assembly drives the third lead screw assembly to rotate synchronously via a chain, thus coordinating the movement of the baffle along the baffle groove towards each other.

8. The bonding effect testing device for a coated diaphragm and an electrode sheet according to claim 3, characterized in that, The tensioning fastener includes four springs and sliders. The sliders slide in the slider groove at the top of the baffle. One end of the spring is fixed to the baffle, and the other end pulls the slider inward. A single spring and slider form a set of clamping structures. Two sets of clamping structures are symmetrically distributed on one side of the baffle to clamp the preform in the width direction.

9. A device for testing the bonding effect between a coated diaphragm and an electrode sheet according to any one of claims 1 to 8, characterized in that, The pressure platform is equipped with a scale on its side to detect the test spacing.

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