Pole piece and diaphragm wrinkling detection device of naked battery cell

Abstract

The utility model relates to a device for detecting wrinkles of a pole piece and a diaphragm of a naked battery cell, which comprises a bearing part, a first shape following fitting surface, a second shape following fitting surface, a first detection part, a second detection part and a third detection part, wherein the top surface of the bearing part is fitted with at least part of the surface of the naked battery cell and is used for bearing the naked battery cell; the pressurizing assembly is provided with a moving mechanism and a pressurizing piece, and the face, facing the bearing piece, of the pressurizing piece is provided with a second shape follow-up attaching face used for being attached to at least part of the surface of the bare battery cell; and the distributed pressure sensor is used for detecting the numerical value of the pressure applied by the naked battery cell to each part of the first shape-followed binding surface and / or the second shape-followed binding surface when the first shape-followed binding surface and the second shape-followed binding surface clamp the naked battery cell together. According to the utility model, the pressure distribution information of each position of the naked battery cell can be obtained, and then whether the pole piece and the diaphragm of the naked battery cell are wrinkled or not is judged. Compared with the existing image detection technology, the device disclosed by the utility model not only realizes nondestructive detection on wrinkles in the naked battery cell, but also can improve the detection precision.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production and manufacturing, in particular to a device for detecting wrinkles of pole pieces and diaphragms of bare batteries. Background Art

[0002] In the field of batteries, the battery cell is the most basic component of the battery, usually an electrochemical device encapsulated in a metal shell. It is a unit for storing and releasing electrical energy, converting chemical energy into electrical energy through chemical reactions. The battery cell is usually composed of a positive electrode, a negative electrode, a diaphragm and an electrolyte. The pole piece and the diaphragm are the core components of the battery cell. However, in the coating, rolling, slitting and winding processes of the battery manufacturing process, the pole piece wrinkling problem is prone to occur. The battery products made of wrinkled pole pieces and diaphragms have great performance degradation and safety hazards. In traditional technology, industrial cameras are often used to collect image information of the blank area of ​​the pole piece, and the wrinkling of the pole piece is judged based on the collected image information. However, the penetration depth of traditional image technology is limited and the accuracy is also low. In particular, there is still no universal detection device for the wrinkling inside the bare battery cell. How to accurately detect the wrinkling inside the bare battery cell is a technical problem that needs to be solved in this field. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to accurately detect the wrinkling condition inside the bare battery cell.

[0004] In order to solve the above technical problems, the utility model provides a bare cell electrode and diaphragm wrinkle detection device, comprising:

[0005] A carrier, the top surface of which has a first conformable fitting surface for fitting with at least a portion of the surface of the bare battery cell and for carrying the bare battery cell, wherein the first conformable fitting surface matches the shape of at least a portion of the surface of the bare battery cell carried by the first conformable fitting surface;

[0006] A pressurizing component, comprising a moving mechanism and a pressurizing member, wherein the pressurizing member is arranged at a moving end of the moving mechanism, and the pressurizing member is arranged opposite to the carrier, and the side of the pressurizing member facing the carrier has a second conformable fitting surface for fitting with at least a portion of the surface of a bare battery cell; the second conformable fitting surface matches the shape of at least a portion of the surface of the bare battery cell fitted therewith; the moving mechanism is used to drive the pressurizing member to move close to the carrier via its moving end, so that the first conformable fitting surface and the second conformable fitting surface jointly clamp the bare battery cell;

[0007] A distributed pressure sensor is arranged on at least a portion of the surface of the first conformable bonding surface and / or at least a portion of the surface of the second conformable bonding surface, and is used to detect the value of the pressure applied by the bare battery cell to various locations of the first conformable bonding surface and / or the second conformable bonding surface when the first conformable bonding surface and the second conformable bonding surface jointly clamp the bare battery cell.

[0008] Furthermore, the first conformable fitting surface and / or the second conformable fitting surface are changeable in shape.

[0009] Further, the bearing member includes a rigid support member, a first telescopic member and a bendable support member, the end of the rigid support member has a first connection area and a first connection position which are sequentially arranged along asymptotically the center thereof, the first telescopic member is slidably installed on the first connection area of ​​the rigid support member along the direction in which the first connection area and the first connection position are arranged, and the telescopic end of the first telescopic member can be lifted and retracted above the rigid support member, one end of the bendable support member is connected to the first connection position of the rigid support member, and the other end of the bendable support member is connected to the telescopic end of the first telescopic member, and the first telescopic member drives the bendable support member to change its curvature and then change the shape of the first conformable fitting surface; and / or,

[0010] The pressure piece includes a rigid pressure piece, a second telescopic piece and a bendable pressure piece. The end of the rigid pressure piece has a second connection area and a second connection position which are sequentially arranged along asymptotically the center thereof. The second telescopic piece can be slidably installed on the second connection area of ​​the rigid pressure piece along the direction in which the second connection area and the second connection position are arranged, and the telescopic end of the second telescopic piece can be lifted and retracted below the rigid pressure piece. One end of the bendable pressure piece is connected to the second connection position of the rigid pressure piece, and the other end of the bendable pressure piece is connected to the telescopic end of the second telescopic piece. The second telescopic piece drives the bendable pressure piece to change its curvature and then changes the shape of the second conformable fitting surface.

[0011] Furthermore, the bendable support member and the bendable pressure member are chain-type components.

[0012] Furthermore, the first conformable fitting surface and / or the second conformable fitting surface is a plane.

[0013] Furthermore, the first conformable fitting surface and / or the second conformable fitting surface is / are arc-shaped surfaces.

[0014] Furthermore, the distributed pressure sensor is arranged on the entire first conformable fitting surface and / or the second conformable fitting surface.

[0015] Furthermore, the pressurizing assembly and the carrier together form a pre-pressing device for pre-pressing a bare cell or a hot pressing device for hot pressing a bare cell.

[0016] Furthermore, the distributed pressure sensor is an array distributed thin film flexible sensor.

[0017] Furthermore, it also includes a control device, which is used to collect data collected by the distributed pressure sensor, convert it into digital signals, store and analyze the data, and display and analyze test results.

[0018] The above technical solution of the utility model has the following advantages compared with the prior art:

[0019] (1) The device for detecting wrinkles of the electrode and diaphragm of a bare cell described in the utility model applies pressure to various positions on the surface of the bare cell through a pressurizing component, and then detects the reaction force of various positions of the bare cell through a distributed pressure sensor, thereby obtaining pressure distribution information of various positions of the bare cell, and then judging whether the electrode and diaphragm of the bare cell are wrinkled. Compared with the existing image detection technology, the utility model not only realizes non-destructive detection of wrinkles inside the bare cell, but also improves the detection accuracy.

[0020] (2) The electrode and diaphragm wrinkle detection device for bare battery cells described in the utility model sets the first conformable fitting surface and the second conformable fitting surface to be changeable in shape. By changing the shapes of the first conformable fitting surface and the second conformable fitting surface, the shapes are matched with the shape of the bare battery cell to be tested and can be fitted, so that the utility model can be applied to bare battery cells of different shapes.

[0021] (3) The electrode and diaphragm wrinkle detection device for a bare battery cell described in the utility model is configured such that a carrier is configured to include a rigid support member, a first telescopic member and a bendable support member, wherein the bendable support member changes adaptively with the surface shape of the bare battery cell; a pressure member is configured to include a rigid pressure member, a second telescopic member and a bendable pressure member, wherein the bendable pressure member changes adaptively with the surface shape of the bare battery cell, so that the first conformable fitting surface and the second conformable fitting surface can change shape, and the carrier has a simple structure and low cost.

[0022] (4) The electrode and diaphragm wrinkle detection device for a bare battery cell described in the utility model, the bendable support member and the bendable pressure member are chain-type components (chains or belts), which can bend and deform adaptively according to the shape of the surface of the bare battery cell, and can reliably support the bare battery cell without affecting the pressure on the bare battery cell.

[0023] (5) The electrode and diaphragm wrinkle detection device for a bare battery cell described in the utility model is suitable for bare batteries with a flat surface when the first conformable fitting surface and the second conformable fitting surface are flat surfaces.

[0024] (6) The electrode and diaphragm wrinkle detection device for a bare battery cell described in the utility model, when the first conformable fitting surface and the second conformable fitting surface are arc-shaped surfaces, is suitable for bare batteries with arc-shaped surfaces.

[0025] (7) In the device for detecting wrinkles of a bare cell electrode and a diaphragm of the utility model, the distributed pressure sensor is arranged on the entire first conformal fitting surface and / or the second conformal fitting surface, which can increase the area of ​​the bare cell surface to be detected and improve the detection accuracy.

[0026] (8) The device for detecting wrinkles of the electrode and diaphragm of the bare battery cell described in the utility model, the pressurizing component and the carrier together form a pre-pressing device for pre-pressing the bare battery cell or a hot pressing device for hot pressing the bare battery cell, that is, as long as a distributed pressure sensor is set on the existing pre-pressing device or hot pressing device, it is possible to detect whether the bare battery cell is wrinkled, which can make full use of the existing equipment and processes, and can perform wrinkle detection while pre-pressing or hot pressing, thereby improving the efficiency of detecting wrinkles of the electrode and diaphragm of the bare battery cell and reducing the cost of detecting wrinkles of the electrode and diaphragm of the bare battery cell;

[0027] (9) The electrode and diaphragm wrinkle detection device for bare battery cells described in the utility model, the above-mentioned distributed pressure sensor is an array distributed thin film flexible sensor, which has the characteristics of being light, flexible and high-precision, and can be applied to the deformable first conformable fitting surface and the second conformable fitting surface, and will not cause any interference to the detection of the bare battery cells.

[0028] (10) The electrode and diaphragm wrinkle detection device for bare battery cells described in the present invention also includes a control device, which calculates, analyzes and displays the detection results of the detection data, thereby improving the degree of automation of the electrode and diaphragm wrinkle detection of bare battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0030] Figure 1 It is a schematic diagram of a bare battery cell in the utility model;

[0031] Figure 2 It is a schematic diagram of the electrode and diaphragm wrinkle detection device of the utility model;

[0032] Figure 3 This is a block diagram of the detection principle of the electrode and diaphragm wrinkling detection in the utility model;

[0033] Figure 4 It is a schematic diagram of the electrode and diaphragm wrinkle detection device of the utility model.

[0034] Explanation of the reference numerals in the figure in the specification: 1. Bare battery cell; 11. Flat surface area; 12. Curved surface area; 2. Carrying member; 21. First conformal fitting surface; 22. Rigid support member; 221. First connection area; 222. First connection position; 23. First telescopic member; 24. Bendable support member; 3. Moving mechanism; 4. Pressurizing member; 41. Second conformal fitting surface; 42. Rigid pressurizing member; 421. Second connection area; 422. Second connection position; 43. Second telescopic member; 44. Bendable pressurizing member; 5. Distributed pressure sensor; 6. Control device; 61. Controller; 62. Display. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0036] The bare cell in the prior art is made of a positive electrode sheet, a negative electrode sheet and a separator; the separator is arranged between the positive electrode sheet and the negative electrode sheet to prevent the positive electrode sheet and the negative electrode sheet from contacting and short-circuiting. There are generally three types of bare cells at present. The first type of bare cell has a rectangular cross section, which is formed by cutting the electrode sheet and the separator into rectangles and then stacking them. The surface of this type of bare cell includes two opposite flat surface areas. The second type of bare cell has an elliptical cross section, such as Figure 1 As shown, the electrode and the diaphragm are stacked and then wound and flattened in sequence, and the bare cell 1 has two opposite flat surface areas 11 and two arc surface areas 12 connecting the two flat surface areas 11. The cross section of the third bare cell is circular, which is formed by stacking the electrode and the diaphragm and then winding, and the surface of this bare cell includes an arc surface area.

[0037] Embodiment 1

[0038] See also Figure 2 and Figure 3 As shown, the above-mentioned electrode and diaphragm wrinkle detection device for bare battery cells includes:

[0039] The carrier 2 is fixed in position, and its top surface has a first conformable fitting surface 21 for fitting with at least part of the surface of the bare battery cell 1 and for carrying the bare battery cell 1, wherein the first conformable fitting surface 21 matches the shape of at least part of the surface of the bare battery cell 1 it carries;

[0040] A pressurizing assembly, comprising a moving mechanism 3 and a pressurizing member 4, wherein the pressurizing member 4 is arranged at the moving end of the moving mechanism 3, and the pressurizing member 4 is located above the carrier 2 and arranged opposite to the carrier 2, and the pressurizing member 4 has a second conformable fitting surface 41 for fitting with at least part of the surface of the bare battery cell 1 on one side facing the carrier 2; the second conformable fitting surface 41 matches the shape of at least part of the surface of the bare battery cell 1 to which it fits; the moving mechanism 3 is used to drive the pressurizing member 4 to move close to the carrier 2 via its moving end, so that the first conformable fitting surface 21 and the second conformable fitting surface 41 jointly clamp the bare battery cell 1;

[0041] The distributed pressure sensor 5 is arranged on at least a portion of the surface of the first conformable bonding surface 21 and / or the second conformable bonding surface 41, and is used to detect the value of the pressure applied by the bare battery cell 1 to various locations of the first conformable bonding surface 21 and / or the second conformable bonding surface 41 when the first conformable bonding surface 21 and the second conformable bonding surface 41 jointly clamp the bare battery cell 1.

[0042] The carrier 2 and the pressure member 4 are clamped at the bottom and the top of the bare cell 1, respectively. The carrier 2 and the pressure member actually form a clamping mechanism for clamping the bare cell 1. It should be noted that, in some embodiments, the carrier 2 and the pressure member 4 are clamped at the left and the right of the bare cell 1, respectively, and this application does not limit this.

[0043] After the bare cell 1 is placed on the carrier 2, the surface of the bare cell 1 in contact with the first conformable fitting surface 21 is the first clamped area, and the first conformable fitting surface 21 matches the shape of the first clamped area. When the pressure member 4 applies pressure to the bare cell 1, the surface of the bare cell 1 in contact with the second conformable fitting surface 41 is the second clamped area, and the second conformable fitting surface 41 matches the shape of the second clamped area.

[0044] The above-mentioned distributed pressure sensor 5 can be arranged on the first conformable bonding surface 21, or on the second conformable bonding surface 41, or on both the first conformable bonding surface 21 and the second conformable bonding surface 41, and is used to detect the pressure applied to the distributed pressure sensor 5 at different positions of the first clamping area and / or the second clamping area.

[0045] When the bare cell 1 is a defect-free bare cell, the thickness at each position should be a set value, and the pressure at that position received by the distributed pressure sensor 5 should also be a set value, or the pressure difference felt by the distributed pressure sensor 5 at each position should be within a preset range. When the electrode or diaphragm at a certain position is wrinkled, the thickness at that position will change, and the pressure at that position received by the distributed pressure sensor 5 will also change. The distributed pressure sensor 5 detects whether the pressure applied to the distributed sensor at each position of the bare cell 1 meets the requirements, or the distributed pressure sensor 5 detects whether the pressure difference felt at each position is within a preset range, thereby determining whether the thickness at each position of the bare cell 1 meets the requirements, and then determining whether there are wrinkled electrode or diaphragm problems at each position of the bare cell 1.

[0046] Specifically, there are generally three detection methods for the above-mentioned electrode and diaphragm wrinkle detection device:

[0047] The first detection method is to directly detect the pressure distribution of the bare cell under test through the above-mentioned pole piece and diaphragm wrinkling device, and later determine whether the pole piece and diaphragm of the bare cell are wrinkled based on whether the pressure at different positions detected by the above-mentioned distributed pressure sensor is consistent. This method is suitable for the situation where the thickness of the clamped part of the bare cell under test is uniform;

[0048] The second detection method is to first perform pressure distribution detection on a non-defective bare cell (i.e., a bare cell with the same specifications as the bare cell being tested and whose pole piece and diaphragm are not wrinkled) through the above-mentioned pole piece and diaphragm wrinkling detection device, and then perform pressure distribution detection on the bare cell being tested through the above-mentioned pole piece and diaphragm wrinkling device, and then compare the detection data of the non-defective bare cell with the detection data of the bare cell being tested, and then determine whether the pole piece and diaphragm of the bare cell being tested are wrinkled. This method is applicable to bare cells of various shapes.

[0049] The third detection method is to directly perform pressure distribution detection on the bare battery cell under test through the above-mentioned electrode and diaphragm wrinkling device, and then judge whether the electrode and diaphragm of the bare battery cell are wrinkled based on whether the pressure at different positions detected by the above-mentioned distributed pressure sensor matches the set pressure of the bare battery cell at the corresponding position.

[0050] Through the above technical solution, the pressure is applied to various positions on the surface of the bare cell 1 by the pressure component, and the reaction force received at various positions of the bare cell 1 is detected by the distributed pressure sensor 5, thereby obtaining the pressure distribution information of various positions of the bare cell 1, and then judging whether the pole piece and diaphragm of the bare cell 1 are wrinkled. Compared with the existing image detection technology, the utility model not only realizes non-destructive detection of wrinkles inside the bare cell 1, but also improves the detection accuracy.

[0051] In this embodiment, the first conformable fitting surface 21 and the second conformable fitting surface 41 are planes.

[0052] The first conformable fitting surface 21 is a plane, which means that the line connecting any two points on the first conformable fitting surface 21 falls entirely on this surface; the second conformable fitting surface 41 is a plane, which means that the line connecting any two points on the second conformable fitting surface 41 falls entirely on this surface.

[0053] Through the above technical scheme, the pole piece and diaphragm wrinkling device of the utility model can perform wrinkling detection on the above-mentioned first and second bare battery cells, and the first conformal fitting surface and the second conformal fitting surface are fitted with the flat surface area of ​​the bare battery cell.

[0054] In other embodiments, the first conformable fitting surface and / or the second conformable fitting surface may not be a plane.

[0055] In this embodiment, the distributed pressure sensor 5 is disposed on the entire first conformable fitting surface 21 and / or the second conformable fitting surface 41 .

[0056] The above-mentioned distributed pressure sensor 5 can be arranged on the entire first conformable fitting surface 21, or on the entire second conformable fitting surface 41, or on the entire first conformable fitting surface 21 and the second conformable fitting surface 41. Since the first conformable fitting surface 21 and the second conformable fitting surface 41 are conformably fitted to the first clamped area and the second clamped area of ​​the bare cell 1, respectively, the distributed pressure sensors 5 at various locations on the first conformable fitting surface 21 and / or the second conformable fitting surface 41 can detect the pressure that indicates whether the pole piece and the diaphragm of the bare cell 1 are wrinkled, and wrinkle detection can be performed on as many locations of the bare cell as possible.

[0057] Through the above technical solution, wrinkle detection can be performed on as many positions of the bare battery cell 1 as possible to improve the detection accuracy.

[0058] In other embodiments, distributed pressure sensors may be disposed on a portion of the first conformable fitting surface and / or the second conformable fitting surface to detect some key positions.

[0059] In this embodiment, the pressurizing assembly and the carrier together form a pre-pressing device for pre-pressing a bare cell or a hot pressing device for hot pressing a bare cell.

[0060] Whether it is a bare cell after lamination or a bare cell after winding, the next process is basically hot pressing, which means pressing the bare cell to a certain thickness to facilitate the subsequent shelling process, while ensuring that the bare cell is not loose. A deeper function is to reduce the distance between the positive and negative electrodes and shorten the journey between lithium ion insertion and insertion. There are usually two ways. The first way is to place the cell between the upper and lower pressing plates, heat the upper and lower pressing plates, and keep them under the set pressure for a certain time, so that the bare cell reaches the required thickness. The second way is to preheat the bare cell first, and then apply a certain pressure between the upper and lower pressing plates to make the bare cell reach the required thickness. This method of preheating the bare cell usually uses a preheating furnace instead of heating the upper and lower pressing plates. Therefore, the pre-pressing device and the hot pressing device are both existing equipment, and the pre-pressing device and the hot pressing device also clamp the bare cell, and fit the first clamped area and the second clamped area of ​​the bare cell.

[0061] The first implementation scheme: When the above-mentioned pressurizing assembly and the above-mentioned carrier jointly form a pre-pressing device for pre-pressing the bare cell, first, place the wound or stacked bare cell on the pre-pressing clamp of a winding machine or stacking machine integrated with a distributed pressure sensor; then, a certain pressure, usually 1-10Mpa, is applied to the bare cell through the pressurizing device at the pre-pressing position. In order to obtain more accurate test results, a higher pressure can be selected if conditions permit. Afterwards, after the applied pressure stabilizes, the pressure at different positions on the large surface of the core is collected through a distributed pressure sensor; finally, the collected pressure data is processed by the control device, and the test results are output to realize the detection of large-surface wrinkles of the bare cell.

[0062] The second implementation scheme: When the above-mentioned pressurizing component and the above-mentioned carrier together form a hot pressing device for hot pressing bare cells, the difference from the first implementation scheme is that the distributed pressure sensor can be integrated into the clamping plate of the hot pressing process. Since the hot pressing pressure of the hot pressing process is usually greater than that of the pre-pressing process, and the pressure is more stable, this is also conducive to improving the accuracy of the detection results.

[0063] Through the above technical scheme, the wrinkle detection of the utility model can make full use of existing equipment and processes, and can perform wrinkle detection during pre-pressing or hot pressing, thereby improving the efficiency of wrinkle detection of the electrode and diaphragm of the bare battery cell 1 and reducing the cost of wrinkle detection of the electrode and diaphragm of the bare battery cell 1.

[0064] In this embodiment, the distributed pressure sensor 5 is an array distributed thin film flexible sensor.

[0065] The above-mentioned array distributed thin film flexible sensor is a prior art, and the specific principle and structure will not be described in detail here.

[0066] Through the above technical solution, the array distributed thin film flexible sensor can be applied to the deformable first conformable fitting surface and the second conformable fitting surface without any interference effect on the detection of the bare battery cell.

[0067] In other embodiments, the distributed pressure sensor may adopt other feasible pressure sensors.

[0068] In this embodiment, a control device 6 is also included. The control device 6 is used to collect the data collected by the distributed pressure sensor 5, convert the data into digital signals, store and analyze the data, and display and analyze the test results.

[0069] The control device 6 includes a controller 61 and a display 62 and is equipped with a data acquisition system and a software program. It is actually a computer. The data acquisition system is used to collect data collected by the pressure sensor and convert it into a digital signal. The data acquisition system is usually connected to a computer and can store and analyze the data. The software program is the key to processing and analyzing the collected data and can display and analyze the test results. In addition to outputting the test results, the control device can also output a two-dimensional pressure distribution image to intuitively present the wrinkling of the large surface of the bare battery cell. The computer equipped with a data acquisition system and a software program is a prior art and has been used in the pressure distribution detection system, which will not be repeated here.

[0070] Through the above technical solution, the degree of automation of wrinkle detection of pole pieces and diaphragms of bare cells can be improved.

[0071] In other embodiments, the control device may include only a controller and only display the detection result without displaying the pressure distribution image.

[0072] In this embodiment, the moving mechanism 3 is a cylinder or a hydraulic cylinder or a servo motor lifting device, which can be selected according to actual needs.

[0073] Embodiment 2

[0074] See also Figure 4 As shown, another embodiment of the pole piece and diaphragm wrinkle detection device disclosed in the utility model.

[0075] The rest is the same as the first embodiment, except that, in this embodiment, the first conformable fitting surface 21 and / or the second conformable fitting surface 41 are variable in shape.

[0076] The shapes of the first conformable fitting surface 21 and / or the second conformable fitting surface 41 should match the shapes of the first clamped area and the second clamped area of ​​the bare cell 1, respectively. The shapes of the first conformable fitting surface 21 and / or the second conformable fitting surface 41 are changed according to the shapes of the first clamped area and the second clamped area of ​​the bare cell 1 to be tested, so as to ensure that no gap is formed between the first clamped area of ​​the clamped bare cell 1 and the first conformable fitting surface 21, and no gap is formed between the second clamped area and the second conformable fitting surface 41 of the clamped bare cell 1. Thus, the electrode and diaphragm wrinkle detection device can be applied to bare cells 1 of various shapes.

[0077] Through the above technical solution, the utility model can be adapted to bare cells 1 of different shapes.

[0078] In other embodiments, the shape of the first conformable fitting surface is fixed and cannot be changed, and the shape of the second conformable fitting surface is fixed and cannot be changed. In this case, the pole piece and diaphragm wrinkle detection device can only be used for wrinkle detection of bare cells of a certain shape.

[0079] In this embodiment, the supporting member 2 includes a rigid support member 22, a first telescopic member 23 and a bendable support member 24. The end of the rigid support member 22 has a first connection area 221 and a first connection position 222 which are sequentially arranged along asymptotically the center thereof. The first telescopic member 23 can be slidably installed on the first connection area 221 of the rigid support member 22 along the direction in which the first connection area 221 and the first connection position 222 are arranged, and the telescopic end of the first telescopic member 23 can be lifted and retracted above the rigid support member 22. One end of the bendable support member 24 is connected to the first connection position 222 of the rigid support member 22, and the other end of the bendable support member 24 is connected to the telescopic end of the first telescopic member 23. The first telescopic member 23 drives the bendable support member 24 to change the curvature and then changes the shape of the first conformable fitting surface 21.

[0080] and / or,

[0081] The above-mentioned pressure piece 4 includes a rigid pressure piece 42, a second telescopic piece 43 and a bendable pressure piece 44. The end of the above-mentioned rigid pressure piece 42 has a second connection area 421 and a second connection position 422 arranged in sequence along asymptotically close to its center. The above-mentioned second telescopic piece 43 can be slidably installed on the second connection area 421 of the above-mentioned rigid pressure piece 42 along the direction in which the second connection area 421 and the second connection position 422 are arranged, and the telescopic end of the above-mentioned second telescopic piece 43 can be lifted and retracted below the above-mentioned rigid pressure piece 42. One end of the above-mentioned bendable pressure piece 44 is connected to the second connection position 422 of the above-mentioned rigid pressure piece 42, and the other end of the above-mentioned bendable pressure piece 44 is connected to the telescopic end of the above-mentioned second telescopic piece 43. The above-mentioned second telescopic piece 43 drives the above-mentioned bendable pressure piece 44 to change the curvature and then changes the shape of the above-mentioned second conformable fitting surface 41.

[0082] The above-mentioned rigid support member 22 and rigid pressure member 42 refer to the rigid support member 22 and rigid pressure member 42 being able to withstand a certain external force and not easily changing shape when in contact with the bare battery cell 1 (for example, when clamping the bare battery cell 1, the rigid support member 22 and the rigid pressure member 42 are not easily deformed). The above-mentioned first telescopic member 23 and the second telescopic member 43 refer to the first telescopic member 23 and the second telescopic member 43 being able to retract. The above-mentioned bendable support member 24 and bendable pressure member 44 refer to the bendable support member 24 and the bendable pressure member 44 being able to bend laterally, but not elongated or shortened (for example, when clamping the bare battery cell 1, the bendable support member 24 and the bendable pressure member 44 will bend and stick to the surface of the bare battery cell 1, but will not elongate). The direction in which the above-mentioned first connection area and the first connection position are set refers to the arrangement direction of the two. For example, if the first connection position is located on the right side of the first connection area, the direction in which the above-mentioned first connection area and the first connection position are set refers to the left-right direction. Similarly, the direction in which the second connection area and the second connection position are set refers to their arrangement direction. For example, if the second connection position is located on the right side of the second connection area, then the direction in which the second connection area and the second connection position are set refers to the left-right direction.

[0083] Through the above technical solution, the first conformable fitting surface and the second conformable fitting surface can change shape, and the structure of the carrier is simple and the cost is low.

[0084] In this example, in order to ensure that the shortened first telescopic member 23 and the second telescopic member 43 can provide a certain supporting force to the flexible support member 24 and the flexible pressure member 44, the first telescopic member 23 and the second telescopic member 43 can be set to a minimum shortening length, or a damping member can be set in the first telescopic member 23 and the second telescopic member 43, and the present application does not make any limitation thereto.

[0085] In this embodiment, the bendable support member 24 and the bendable pressurizing member 44 are both chain-type components.

[0086] The chain-type component can withstand external forces and bend, and can support the bare battery cell 1 and conform to the bare battery cell 1 in a shape-fitting manner.

[0087] In this embodiment, both ends of the first conformable fitting surface 21 and the second conformable fitting surface 41 are arc-shaped surfaces.

[0088] The middle part of the above-mentioned first conformable fitting surface 21 is the plane of the above-mentioned rigid support member 22, and the two ends of the above-mentioned first conformable fitting surface 21 are the arcuate surfaces of the above-mentioned bendable support member 24. The middle part of the above-mentioned second conformable fitting surface 41 is the plane of the above-mentioned rigid pressure member 42, and the two ends of the above-mentioned second conformable fitting surface 41 are the arcuate surfaces of the above-mentioned bendable pressure member 44.

[0089] Through the above technical scheme, the electrode and diaphragm wrinkling device of the utility model can perform wrinkling detection on the above-mentioned second type of bare battery cell, the middle parts of the first conformable fitting surface 21 and the second conformable fitting surface 41 are fitted with the flat surface area of ​​the bare battery cell 1, and the two ends of the first conformable fitting surface 21 and the second conformable fitting surface 41 are fitted with the curved surface of the bare battery cell 1.

[0090] In other embodiments, the first conformable fitting surface and / or the second conformable fitting surface may be arc-shaped surfaces as a whole. In this case, the wrinkle detection device for the pole piece and the diaphragm is suitable for wrinkle detection of the third type of bare battery cell.

[0091] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. In addition, the contents of the above embodiments 1 and 2 can be combined with each other under reasonable circumstances, such as setting the first conformable fitting surface 21 in embodiment 1 and the two ends of the above second conformable fitting surface 41 as arc surfaces. The obvious changes or modifications derived from this are still within the protection scope of the invention of the utility model.

Claims

1. A device for detecting wrinkles of a bare cell electrode and a diaphragm, characterized in that: include: A carrier, the top surface of which has a first conformable fitting surface for fitting with at least a portion of the surface of the bare battery cell and for carrying the bare battery cell, wherein the first conformable fitting surface matches the shape of at least a portion of the surface of the bare battery cell carried by the first conformable fitting surface; A pressurizing component, comprising a moving mechanism and a pressurizing member, wherein the pressurizing member is arranged at a moving end of the moving mechanism, and the pressurizing member is arranged opposite to the carrier, and the side of the pressurizing member facing the carrier has a second conformable fitting surface for fitting with at least a portion of the surface of a bare battery cell; the second conformable fitting surface matches the shape of at least a portion of the surface of the bare battery cell fitted therewith; the moving mechanism is used to drive the pressurizing member to move close to the carrier via its moving end, so that the first conformable fitting surface and the second conformable fitting surface jointly clamp the bare battery cell; A distributed pressure sensor is arranged on at least a portion of the surface of the first conformable bonding surface and / or at least a portion of the surface of the second conformable bonding surface, and is used to detect the value of the pressure applied by the bare battery cell to various locations of the first conformable bonding surface and / or the second conformable bonding surface when the first conformable bonding surface and the second conformable bonding surface jointly clamp the bare battery cell.

2. The device for detecting wrinkles of a bare cell electrode and a diaphragm according to claim 1, characterized in that: The first conformable surface and / or the second conformable surface may be changeable in shape.

3. The device for detecting wrinkles of a bare cell electrode and a diaphragm according to claim 2, characterized in that: The bearing member includes a rigid support member, a first telescopic member and a bendable support member, the end of the rigid support member has a first connection area and a first connection position which are sequentially arranged along asymptotically to the center thereof, the first telescopic member is slidably mounted on the first connection area of ​​the rigid support member along the direction in which the first connection area and the first connection position are arranged, and the telescopic end of the first telescopic member can be lifted and retracted above the rigid support member, one end of the bendable support member is connected to the first connection position of the rigid support member, the other end of the bendable support member is connected to the telescopic end of the first telescopic member, and the first telescopic member drives the bendable support member to change the curvature and then change the shape of the first conformable fitting surface; and / or, The pressure piece includes a rigid pressure piece, a second telescopic piece and a bendable pressure piece. The end of the rigid pressure piece has a second connection area and a second connection position which are sequentially arranged along asymptotically the center thereof. The second telescopic piece can be slidably installed on the second connection area of ​​the rigid pressure piece along the direction in which the second connection area and the second connection position are arranged, and the telescopic end of the second telescopic piece can be lifted and retracted below the rigid pressure piece. One end of the bendable pressure piece is connected to the second connection position of the rigid pressure piece, and the other end of the bendable pressure piece is connected to the telescopic end of the second telescopic piece. The second telescopic piece drives the bendable pressure piece to change its curvature and then changes the shape of the second conformable fitting surface.

4. The device for detecting wrinkles of a pole piece and a diaphragm of a bare battery cell according to claim 3, characterized in that: The bendable support member and the bendable pressurizing member are chain-type components.

5. The device for detecting wrinkles of a bare cell electrode and a diaphragm according to claim 1, characterized in that: The first conformable surface and / or the second conformable surface is a plane.

6. The device for detecting wrinkles of a bare cell electrode and a diaphragm according to claim 1, characterized in that: The first conformable fitting surface and / or the second conformable fitting surface is / are arc-shaped surfaces.

7. The device for detecting wrinkles of a bare cell electrode and a diaphragm according to any one of claims 1 to 6, characterized in that: The distributed pressure sensor is arranged on the entire first conformable surface and / or the second conformable surface.

8. The device for detecting wrinkles of a pole piece or a diaphragm of a bare battery cell according to any one of claims 1 to 6, characterized in that: The pressurizing assembly and the carrier together form a pre-pressing device for pre-pressing a bare cell or a hot pressing device for hot pressing a bare cell.

9. The device for detecting wrinkles of a pole piece or a diaphragm of a bare battery cell according to any one of claims 1 to 6, characterized in that: The distributed pressure sensor is an array distributed thin film flexible sensor.

10. The device for detecting wrinkles of a pole piece or a diaphragm of a bare battery cell according to any one of claims 1 to 6, characterized in that: It also includes a control device, which is used to collect data collected by the distributed pressure sensor, convert it into digital signals, store and analyze the data, and display and analyze test results.

Images