Online detection device for electric weakness of lithium battery diaphragm

Abstract

The utility model discloses an on-line detection device for the electric weakness of a lithium battery diaphragm, and belongs to the technical field of lithium battery diaphragm production. The detection device comprises a group of mounting racks which are oppositely arranged, a detection mechanism for detecting the electric weakness of the lithium battery diaphragm is arranged on the mounting racks, and the detection mechanism comprises a conductive rubber plate and an electrode roller which are arranged in parallel; wherein the end surface of the conductive rubber plate is provided with a plurality of working surfaces which can be switched for use; the conductive rubber plate is located above the electrode roller, and the distance between the conductive rubber plate and the electrode roller is adjustable. According to the diaphragm electric weak point detection device, the conductive rubber plate is adopted as the high-voltage positive electrode end, and compared with a traditional metal plate, the risk that the surface of the diaphragm is scratched can be effectively reduced; meanwhile, the end face of the conductive rubber plate is designed to be trapezoid to form a plurality of working faces, and the service life of the conductive rubber plate can be greatly prolonged through alternate operation of different working faces.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the lithium electricity diaphragm production technical field, more specifically, relate to a kind of for lithium electricity diaphragm electric weak point online detection device. BACKGROUND

[0002] Lithium battery is widely used in electronic communication, energy storage and power supply and other fields, which is mainly composed of positive electrode, negative electrode, electrolyte and battery diaphragm, wherein, diaphragm is one of the key inner components.Diaphragm performance determines the interface structure, internal resistance of battery, directly affects the capacity, cycle and safety performance and other characteristics of battery, and excellent diaphragm performance plays an important role in improving the overall performance of battery.The main function of diaphragm is to separate the positive and negative electrodes of battery to prevent short circuit caused by the contact of two electrodes, in addition, it also has the function of allowing electrolyte ions to pass.Diaphragm material is non-conductive, and its physical and chemical properties have a great influence on the performance of battery.

[0003] However, due to the influence of foreign matter and coating impurities in the production process of diaphragm, lithium battery diaphragm has such defects as electric weak point.The existence of these electric weak points will make the breakdown voltage of diaphragm too low, and the risk of internal short circuit of battery will increase, which may cause safety accidents.Therefore, it is necessary to detect the electric weak point of lithium diaphragm.

[0004] After searching, there are related patents about lithium diaphragm electric weak point detection device, and the applicant has been committed to the research and development design and structure optimization of lithium diaphragm electric weak point detection device.For example, in the patent CN219429269U, a rewinding machine with electric weak point detection function is disclosed.The application includes steel roller, PLC controller, mounting bracket, the mounting bracket is provided with high-voltage test copper plate and conductive steel roller, the high-voltage test copper plate is fixedly connected with the mounting bracket through insulating mounting plate, the both ends of the conductive steel roller are rotatably connected with the mounting bracket, the high-voltage test copper plate and conductive steel roller are electrically connected with the voltage-withstanding tester, the mounting bracket is also provided with a meter counter, the meter counter is located at one end of the mounting bracket close to the conductive steel roller, the meter counter is fixedly connected with the mounting bracket, the PLC controller is electrically connected with the meter counter and voltage-withstanding tester.Through the above technical scheme, the electric weak point detection function is added, which can detect a large number of lithium battery diaphragms without damage, and the position of the detected electric weak point defect can be located, the necessary process equipment is optimized, the application range of rewinding machine is improved, and various detection means are provided for product quality guarantee.But in this application, high-voltage test copper plate is used as high-voltage positive electrode, because of its high hardness and rigidity, it is easy to scratch the surface of diaphragm. UTILITY MODEL CONTENTS

[0005] 1. Problem to be solved

[0006] In view of at least some problems existing in the prior art, the utility model provides a device for lithium battery diaphragm electric weak point on line detection, which aims at solving the problem that the surface of the lithium battery diaphragm is easily scratched during the electric weak point detection process of the existing lithium battery diaphragm.

[0007] 2, technical scheme

[0008] In order to solve the above problems, the technical scheme adopted by the utility model is as follows:

[0009] The utility model discloses a device for lithium battery diaphragm electric weak point on line detection, which comprises a set of mounting frames arranged oppositely, a detection mechanism for detecting the electric weak point of the lithium battery diaphragm is arranged on the mounting frame,

[0010] The detection mechanism comprises conductive rubber plates and electrode rollers arranged in parallel, wherein the end face of the conductive rubber plate has a plurality of switchable working surfaces;

[0011] The conductive rubber plate is located above the electrode roller, and the spacing between the two can be adjusted.

[0012] Further, the conductive rubber plate is arranged on the mounting frame through a swing assembly, and the swing assembly comprises a horizontal rod and swing plates arranged at both ends of the horizontal rod.

[0013] The conductive rubber plate is arranged on the horizontal rod through a clamp, the swing plate is hinged to the mounting frame through a pin shaft, and the swing plate is provided with adjusting rods on both sides.

[0014] Further, an arc-shaped swing groove is formed in the swing plate, and a positioning pin is arranged in the swing groove.

[0015] Further, the end face of the conductive rubber plate is in the form of a trapezoidal structure, and has three working surfaces in contact with the lithium battery diaphragm.

[0016] Further, the end of the electrode roller is connected with a lifting assembly, the lifting assembly comprises a fixed block arranged on the mounting frame, a push rod and a sliding block are arranged on the fixed block, and the end of the electrode roller is arranged on the sliding block.

[0017] Further, a boss is arranged on the sliding block, and a bearing for connecting the electrode roller is arranged in the boss.

[0018] Further, the included angle between the electrode roller and the lithium battery diaphragm is 60-120 degrees.

[0019] Further, at least one guide roller is arranged on each of the two sides of the axial direction of the electrode roller, and a reinforcing beam is arranged between the two mounting frames.

[0020] Further, the electrode roller is a steel roller; and the push rod is an electric push rod.

[0021] 3. Advantages

[0022] Compared with the prior art, the utility model has the advantages that:

[0023] (1) The device for online detection of electric weak points of lithium battery diaphragm, which adopts the conductive rubber plate as the high-voltage positive electrode end, can effectively reduce the risk of scratches on the diaphragm surface compared with the traditional metal plate; meanwhile, the end face of the conductive rubber plate is designed in a trapezoidal shape to form multiple working surfaces, and the service life of the conductive rubber plate can be greatly extended through the rotation of different working surfaces.

[0024] (2) The device for online detection of electric weak points of lithium battery diaphragm, through the setting of the swing assembly, can swing the conductive rubber plate within a certain range, and after the damage of one of the working surfaces, the swing assembly can drive the end of the conductive rubber plate to rotate, so that the next working surface can be stably attached to the diaphragm surface to continue the detection work, and the accuracy of the detection result is ensured.

[0025] (3) The device for online detection of electric weak points of lithium battery diaphragm, through the setting of the lifting assembly, not only can flexibly adjust the gap between the conductive rubber plate and the electrode roller to adapt to the detection work of diaphragms of different specifications, but also can adjust the position of the electrode roller to ensure that the lithium battery diaphragm has a sufficient wrap angle on the electrode roller, which is also conducive to the accuracy of the detection result. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic view of the device for online detection of electric weak points of lithium battery diaphragm of the utility model;

[0027] Figure 2 It is a structural schematic view of the detection mechanism in the utility model;

[0028] Figure 3 It is Figure 2 the local enlarged view of A in the utility model;

[0029] Figure 4 It is a structural schematic view of the end of the conductive rubber plate in the utility model.

[0030] In the figure: 1, mounting frame; 2, detection mechanism; 21, conductive rubber plate; 22, electrode roller;

[0031] 23, swing assembly; 231, cross rod; 232, swing plate; 2321, swing groove; 233, adjusting rod; 234, clamp;

[0032] 24, lifting assembly; 241, fixed block; 242, push rod; 243, sliding block;

[0033] 3, guide roller; 4, reinforcing beam. DETAILED DESCRIPTION

[0034] In order to further understand the content of the present application, the present application will be described in detail in conjunction with the drawings.

[0035] In the description of the present application, it should be pointed out that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] The present application will be further described in conjunction with specific embodiments.

[0037] As shown in Figure 1 , Figure 2 The present application relates to a kind of for lithium battery separator electric weak point online detection device of the embodiment, including a set of installation frame 1 of relative arrangement, detection mechanism 2 for detecting the electric weak point of lithium battery separator is arranged between two installation frames 1.It includes the electrically conductive rubber plate 21 and electrode roller 22 that are arranged in parallel and up and down, and the gap for the lithium battery separator to be detected to pass between the electrically conductive rubber plate 21 and electrode roller 22.Of course, film running roller group also needs to be arranged between two installation frames 1, and the film running roller group at least includes the guide roller 3 of being arranged in the axial two sides of electrode roller 22.At the same time, in order to guarantee the support strength of installation frame 1, reinforcing beam 4 is also arranged between two installation frames 1.

[0038] Traditional separator electric weak point detection device often uses steel metal plate as high-voltage positive terminal, so as to easily cause scratch on the surface of separator.In the embodiment, flexible electrically conductive rubber plate 21 is used as high-voltage positive terminal, which can effectively reduce the risk of scratch on the surface of separator;At the same time, electrically conductive rubber plate 21 also has good corrosion resistance, and can be operated stably for a long time in humid, acid and alkali and other harsh environments. Preferably, electrically conductive rubber plate 21 can be selected from silica gel conductive plate doped with graphite powder. The addition of graphite powder can improve the electrical conductivity of rubber, while maintaining its good elasticity and flexibility.

[0039] During use, the conductive rubber plate 21 will be worn due to friction and electric spark carbonization, thereby affecting the contact effect with the diaphragm. At this time, a new conductive rubber plate 21 needs to be replaced, which not only affects the continuity of production, but also increases the production cost. Therefore, in the embodiment, the end of the conductive rubber plate 21 abandons the traditional flat design and adopts a polyhedral end face form. In this way, each face of the polyhedron can be used as a separate working face. By adjusting the turning of the conductive rubber plate 21, the switching of the new working face can be completed, which not only saves the replacement time, but also greatly extends the service life of the conductive rubber plate 21.

[0040] Reference Figure 4 As shown, specifically in the embodiment, the end face of the conductive rubber plate 21 is trapezoidal in structure and has three working faces that can stably contact the lithium battery diaphragm. When one of the working faces is worn, another working face can be brought into stable contact with the lithium battery diaphragm by adjusting the angle of the conductive rubber plate 21, so as to continue the detection work of the weak point and ensure the accuracy of the detection result.

[0041] In order to facilitate the adjustment of the swing angle of the conductive rubber plate 21, the switching operation between different working faces of the conductive rubber plate 21 can be more convenient and fast. In the embodiment, the conductive rubber plate 21 is connected with a swing assembly 23 for adjusting the swing angle of the conductive rubber plate 21.

[0042] Specifically, referring to Figure 2 , Figure 3 As shown, the swing assembly 23 includes a crossbar 231 and swing plates 232 arranged at both ends of the crossbar 231. The conductive rubber plate 21 is arranged on the crossbar 231 through a clamp 234, and the swing plates 232 are hingedly connected to the mounting frame 1 through a pin shaft, so that the swing plates 232 can swing along the connecting point between the swing plates 232 and the mounting frame 1, thereby driving the conductive rubber plate 21 to swing through the crossbar 231 to realize the switching of different working faces.

[0043] Further, in the embodiment, an arc-shaped swing groove 2321 is formed in the swing plate 232, and a positioning pin is arranged in the swing groove 2321. The positioning pin is fixed to the inner side surface of the mounting frame 1. The swing groove 2321 and the positioning pin can guide and limit the swing movement of the swing plate 232.

[0044] Meanwhile, adjusting rods 233 are arranged on both sides of the swing plate 232, and the swing plate 232 can be stably kept in the state after swinging by clamping and limiting the left and right sides of the two adjusting rods 233. Specifically, a fixed nut is arranged on the inner side of the mounting frame 1, and the adjusting rod 233 is a threaded rod matched with the fixed nut. In addition, in order to facilitate the observation of the swing angle of the swing plate 232, a scale mark can be arranged on the outer periphery of the swing groove 2321 of the swing plate 232.

[0045] The online detection device for the electric weak point of the lithium battery diaphragm can swing the conductive rubber plate 21 within a certain range through the swing assembly 23. When one of the working surfaces is damaged, the swing assembly 23 can drive the end of the conductive rubber plate 21 to rotate, so that the next working surface can be stably attached to the diaphragm surface to continue the detection work, and the accuracy of the detection result is ensured.

[0046] As another preferred mode of the detection mechanism 2, the detection mechanism 2 further comprises a lifting assembly 24, which can be used to adjust the gap between the conductive rubber plate 21 and the electrode roller 22. Specifically, referring to FIG. 4, the lifting assembly 24 comprises a fixed block 241 arranged on the mounting frame 1, the fixed block 241 is provided with a push rod 242 and a sliding block 243; meanwhile, a boss is arranged on the sliding block 243, and a bearing for connecting the electrode roller 22 is arranged in the boss. The push rod 242 is preferably an electric push rod. Figure 3

[0047] In the embodiment, the lifting assembly 24 can not only flexibly adjust the gap between the conductive rubber plate 21 and the electrode roller 22 to adapt to the detection work of diaphragms of different specifications, but also can adjust the position of the electrode roller 22 to ensure that the lithium battery diaphragm has a sufficient wrap angle on the electrode roller 22, which is also beneficial to the accuracy of the detection result.

[0048] It is worth mentioning that the wrap angle refers to the central angle corresponding to the circumference part of the electrode roller 22 covered by the lithium battery diaphragm, which is preferably controlled within 60°-120°, which can effectively ensure the contact area between the lithium battery diaphragm and the electrode roller 22. In addition, it should be noted that the online detection device for the electric weak point of the lithium battery diaphragm can be used for online detection of the lithium battery diaphragm after cutting, and the electrode roller 22 is generally arranged to have a length of 4-6m. Therefore, the electrode roller 22 is preferably a steel roller with good conductive performance and sufficient strength.

[0049] ​The above describes the utility model and its embodiments in a schematic manner, and the description is not restrictive, and the drawings only show one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person of ordinary skill in the art is inspired thereby, without departing from the creative concept of the utility model, similar structural modes and embodiments are designed without creativity, and all should belong to the protection scope of the utility model.

Claims

1. An online detection device for electrical weakness of a lithium battery diaphragm, comprising a set of mounting frames (1) arranged opposite to each other, characterized in that: The mounting frame (1) is provided with a detection mechanism (2) for detecting electrical weaknesses of the lithium battery diaphragm. The detection mechanism (2) comprises a conductive rubber plate (21) and an electrode roller (22) arranged in parallel; wherein the end surface of the conductive rubber plate (21) has a plurality of working surfaces that can be switched for use; The conductive rubber plate (21) is located above the electrode roller (22), and the distance between the two is adjustable.

2. The device for online detection of electrical weakness of a lithium battery diaphragm according to claim 1, characterized in that: The conductive rubber plate (21) is arranged on the mounting frame (1) via a swing assembly (23), wherein the swing assembly (23) includes a crossbar (231) and swing plates (232) arranged at both ends of the crossbar (231); The conductive rubber plate (21) is arranged on the crossbar (231) through a clamp (234), the swing plate (232) is hinged to the mounting frame (1) through a pin, and adjustment rods (233) are provided on both sides of the swing plate (232).

3. The device for online detection of electrical weakness of a lithium battery diaphragm according to claim 2, characterized in that: The swing plate (232) is provided with an arc-shaped swing groove (2321), and a positioning pin is provided in the swing groove (2321).

4. The device for online detection of electrical weakness of a lithium battery diaphragm according to claim 3, characterized in that: The end surface of the conductive rubber plate (21) is a trapezoidal structure as a whole, and has three working surfaces in contact with the lithium battery diaphragm.

5. An online detection device for electrical weakness of lithium battery diaphragms according to any one of claims 1 to 4, characterized in that: The end of the electrode roller (22) is connected to a lifting assembly (24), and the lifting assembly (24) includes a fixed block (241) arranged on the mounting frame (1), and the fixed block (241) is provided with a push rod (242) and a sliding block (243), and the end of the electrode roller (22) is arranged on the sliding block (243).

6. The device for online detection of electrical weakness of lithium battery diaphragms according to claim 5, characterized in that: The sliding block (243) is provided with a boss, and a bearing for connecting the electrode roller (22) is assembled in the boss.

7. The device for online detection of electrical weakness of lithium battery diaphragms according to claim 5, characterized in that: The wrap angle between the electrode roller (22) and the lithium battery separator is 60°-120°.

8. The device for online detection of electrical weakness of lithium battery diaphragms according to claim 1, characterized in that: At least one guide roller (3) is provided on each axial side of the electrode roller (22), and a reinforcing beam (4) is provided between the two mounting frames (1).

9. The device for online detection of electrical weakness of lithium battery diaphragms according to claim 5, characterized in that: The electrode roller (22) is a steel roller; the push rod (242) is an electric push rod.

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