Measurement device

Abstract

The present application discloses a measurement device, which is used for measuring the length of insulating paper exposed out of an end portion of a roll core, and comprises: a main body and at least one measurement structure provided on the main body, wherein the measurement structure comprises a positioning member and a length measurement member; the positioning member is configured to extend into a central hole of the roll core; and the length measurement member is used for measuring the length of the insulating paper exposed out of the roll core.

Description

Measuring device

[0001] This application claims priority to Chinese Patent Application No. 2024233074062, filed with the Chinese Patent Office on December 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more particularly to a measuring device. Background Technology

[0003] In the production process of lithium batteries, in order to avoid contact between the positive and negative electrode plates and the aluminum shell, an insulating adhesive is applied around the core after the cell is wound to separate the tabs from the aluminum shell. Therefore, the consistency of the exposed length of the adhesive tape relative to the core is related to the quality and safety of the cell.

[0004] In related technologies, when measuring the exposed length of adhesive tape, CCD measurement or optical lens instruments are generally used. Technical issues

[0005] When using CCD for measurement, the CCD camera can only photograph the outer surface of the adhesive tape and cannot penetrate to the inner surface, resulting in the entire width of the adhesive tape being recorded, which leads to inaccurate measurements. When using optical lens instruments for measurement, the roll core needs to be removed from the production line and taken to a specialized laboratory for measurement by specialized testing personnel. This process is complicated and time-consuming, reducing equipment uptime and limiting production capacity. Technical solutions

[0006] In a first aspect, this application provides a measuring device for measuring the length of exposed insulating paper at the end of a core, comprising:

[0007] The main body and at least one measuring structure disposed on the main body, the measuring structure including a positioning member and a length measuring member, the positioning member being used to extend into a hole in the center of the core, and the length measuring member being used to measure the length of the insulating paper exposed relative to the core. Beneficial effects

[0008] By inserting the positioning piece into the hole in the center of the core, the length of the exposed insulation paper can be quickly obtained through the length measuring piece, improving measurement efficiency. At the same time, during measurement, the cores can be placed on the conveyor belt and transported one by one for measurement without stopping the production line, thus ensuring production capacity. Attached Figure Description

[0009] Figure 1 is a perspective view of the core of an embodiment of this application;

[0010] Figure 2 is a schematic diagram of the core structure in Figure 1;

[0011] Figure 3 is a structural schematic diagram of the measuring device according to an embodiment of this application from one perspective;

[0012] Figure 4 is a structural schematic diagram of the measuring device in Figure 3 from another perspective;

[0013] Figure 5 is a reference diagram of the first usage state of the measuring device in Figure 3;

[0014] Figure 6 is a reference diagram of the second usage state of the measuring device in Figure 3;

[0015] Figure 7 is an enlarged schematic diagram of point I in Figure 5;

[0016] Figure 8 is a reference diagram of the third usage state of the measuring device in Figure 3;

[0017] Figure 9 is a reference diagram of the fourth usage state of the measuring device in Figure 3;

[0018] Figure 10 is an enlarged schematic diagram of point II in Figure 9;

[0019] Figure 11 is a flowchart illustrating the measurement method according to an embodiment of this application.

[0020] Attached Figures: 100-Measuring Device, 10-Main Body, 20-Measuring Structure, 21-Positioning Component, 211-End, 22-Length Measuring Component, 221-Positioning Platform, 222-Scale Line, 200-Core, 210-Negative Tab, 220-Positive Tab, 230-Insulating Paper, 231-First Section, 232-Second Section, 240-Hole, 250-End Face. Embodiments of the present invention

[0021] Example 1

[0022] Please refer to Figures 1 and 2. After the core 200 is wound, a hole 240 is formed in the center. At the same time, an insulating paper 230 is wound around each of the two ends of the core 200 to separate the positive electrode tab 220 and the negative electrode tab 210 from the outer casing, respectively, to prevent short circuits. In some embodiments, after the insulating paper 230 is wound, a portion of the insulating paper 230 protrudes above the end face 250 of the core 200, i.e., as the exposed portion, while a portion covers the positive electrode tab 220 or the negative electrode tab 210.

[0023] In some embodiments, referring to Figure 2, the insulating adhesive includes two sections along the axial direction of the core 200: a first section 231 and a second section 232. The first section 231 wraps around the core 200, covering the positive electrode tab 220 or the negative electrode tab 210. The second section 232 is exposed relative to the end face 250 of the core 200. Subsequently, the exposed second section 232 is flattened towards the end face 250 of the core 200, and then the positive and negative electrodes 210 are welded to the current collector respectively.

[0024] During production, if the length of the insulating paper 230 is not properly controlled, excessive exposed length can lead to poor contact between the current collector and the positive and negative electrodes 210. Conversely, insufficient exposed length may fail to cover the electrodes, negatively impacting product quality. Therefore, it is necessary to measure the length of the exposed second segment 232 of the insulating paper 230. However, existing methods using CCD or optical lens instruments cannot quickly determine the length, thus affecting production capacity.

[0025] Therefore, in order to quickly measure the exposed length of the insulating paper 230, please refer to Figures 3 to 10. The measuring device 100 provided in the embodiment of this application includes a main body 10 and at least one measuring structure 20 disposed on the main body 10.

[0026] In some embodiments, referring to Figures 3 and 4, the measuring structure 20 includes a positioning member 21 and a length measuring member 22. The positioning member 21 is used to extend into the hole 240 at the center of the core 200, and the length measuring member 22 is used to measure the length of the insulating paper 230 exposed relative to the core 200.

[0027] The aforementioned measuring device 100 is inserted into the hole 240 at the center of the core 200 via the positioning member 21. The length of the exposed insulating paper 230 can be quickly obtained through the length measuring member 22, which improves the measurement efficiency. At the same time, during measurement, the core 200 can be placed on a conveyor belt and transported one by one for measurement without stopping the production line, thus ensuring production capacity.

[0028] In some embodiments, when measuring the core 200, multiple positioning fixtures arranged in parallel can be placed on the conveyor belt. Each positioning fixture is used to place and position the core 200, so that the core 200 can be conveyed one by one by the conveyor belt. The worker holds the measuring device 100 by hand, aligns the positioning part 21 of the measuring device 100 with the hole 240 of the core 200 and inserts it. The exposed length of the insulating paper 230 can then be quickly measured by the length measuring part 22. After measurement, the core is returned to the positioning fixture. The worker can measure at the workstation without taking the core 200 to a special laboratory. The production line does not need to be stopped, thus achieving higher production efficiency and increasing production capacity. The results can also be obtained quickly and accurately by the length measuring part 22.

[0029] In some embodiments, during measurement, the worker slowly pushes the positioning element 21 into the hole 240 of the core 200 with his hand, so that the positioning element 21 is fully inserted into the hole 240. Then, the core 200 and the measuring device 100 are placed on a horizontal plane, and the worker looks down. Based on the length measuring element 22, the corresponding result of the exposed length of the insulating paper 230 is quickly obtained.

[0030] In some embodiments, the body is columnar, while in others it may be square, rhomboid, triangular, polygonal, or other structures, and is not limited thereto.

[0031] Referring to Figure 4, in some embodiments, to provide different measurement methods, the measuring device 100 includes two measuring structures 20, defined as a first measuring structure a and a second measuring structure b. The first measuring structure a and the second measuring structure b are respectively disposed at both ends of the main body 10 along the length direction of the main body 10. The first length measuring element in the first measuring structure a is used to coarsely measure the length of the insulating paper 230 exposed relative to the core 200, and the second length measuring element in the second measuring structure b is used to finely measure the length of the insulating paper 230 exposed relative to the core 200. That is, the length measuring elements 22 in the two measuring structures 20 can be set to different structures to achieve a quick coarse measurement result or to obtain a fine measurement result, so as to meet the needs of different core 200 production.

[0032] In some implementations, when the production line consistently uses the first type of core 200, the exposed lengths of the insulating paper 230 of the same type of core 200 are basically the same, with only minor differences. For example, when the difference between the measured exposed length of the insulating paper 230 and the standard value is within ±(0.5-1mm), the production requirements can be met. Therefore, the method of rapid measurement using the first length measuring device can improve production efficiency. However, when the production line is changed, due to the change of the core 200 model, the exposed lengths of the insulating paper 230 vary significantly. It is necessary to use the second length measuring device to accurately measure whether the exposed length is within the preset error range.

[0033] In some embodiments, please refer to Figures 3 and 7 to 9. The first length measuring element is disposed on the first positioning element 21, including a plurality of positioning platforms 221 connected sequentially along the axial direction of the main body 10. The widths of the plurality of positioning platforms 221 along the radial direction of the main body 10 are different, that is, each positioning platform 221 has its own width. When the first positioning element 21 is inserted into the hole 240 of the core 200, the end face of the insulating paper 230 is located at a certain positioning platform 221, and the exposed length of the insulating paper 230 can be quickly judged. If it corresponds to the preset positioning platform 221, the qualification of the core 200 can be quickly judged. That is, by setting positioning platforms 221 of different widths, a quick judgment can be made when the insulating paper 230 is aligned with the positioning platform 221, thereby improving the testing efficiency. In some implementations, when positioning platforms 221 of different widths are provided, the corresponding central angle of the positioning platform 221 can be less than 360 degrees, such as 30 degrees, 45 degrees or 60 degrees. Along the length direction of the main body 10, multiple positioning platforms 221 can be arranged in a staggered manner along the axial direction of the first positioning member 21, which can also help improve the efficiency of judgment.

[0034] Understandably, the more positioning stations 221 are set, the smaller the height of each positioning station 221 along the length of the main body 10, which can improve the accuracy of judgment.

[0035] In some embodiments, when multiple positioning platforms 221 are provided along the length of the main body 10, the width of the multiple positioning platforms 221 along the radial direction of the main body 10 can be set to gradually increase towards the main body 10. That is, the closer to the main body 10, the larger the width of the positioning platform 221 along the radial direction of the positioning member 21, and the closer it can get to the width of the main body 10. This makes the width of the positioning platform 221 set in a regular manner, which is convenient for the forming of the multiple positioning platforms 221 and the main body 10.

[0036] In some embodiments, each positioning platform 221 is columnar, that is, it surrounds the positioning member 21 and encloses the positioning member 21 360 degrees, which can improve the structural strength of the positioning member 21.

[0037] In some embodiments, to improve the efficiency of judgment during measurement, the surface of each positioning stage 221 is coated with a different color. This color coating on the positioning stage 221 creates a visual impact, allowing for a quick and rough judgment of whether the length of the insulating paper 230 conforms to a preset standard range based on the color corresponding to the positioning stage 221, thus improving measurement efficiency. In some embodiments, when three positioning stages 221 are provided, they can be coated sequentially with yellow, green, and red towards the main body 10. It should be noted that the color of the positioning stages 221 can be set as needed and is not limited here.

[0038] In some embodiments, the measuring structure 20 and the main body 10 are integrally formed, that is, the positioning platform 221, the positioning element 21 and the main body 10 can be integrally formed to improve the forming efficiency and ensure the structural strength. In some embodiments, the components can also be connected by welding or bonding, which is not limited here.

[0039] Please refer to Figures 3 and 7 to 9. In some embodiments, after the positioning member 21 is inserted into the hole 240 of the core 200, the positioning platform 221 furthest from the main body 10 is usually covered by the exposed insulating paper 230. Therefore, the length of the positioning platform 221 furthest from the main body 10 along the axial direction of the main body 10 is greater than the length of the other positioning platforms 221 along the axial direction of the main body 10. That is, the length of the positioning platform 221 closest to the core 200 is the longest. The setting of this positioning platform 221 is usually not used to determine the length of the insulating paper 230. Therefore, the longest setting of this positioning platform 221 can increase the structural strength of the positioning member 21.

[0040] Understandably, as the first positioning member 21 extends into the hole 240, the end face of the first positioning platform 221 away from the main body 10 and the end face 250 of the core 200 abut against each other. At this time, the measuring device 100 stops its insertion action, and the exposed length of the insulating paper 230 can be roughly judged.

[0041] Please refer to Figures 4 to 6 and Figures 8 to 10, which are schematic diagrams of the second measuring structure b in some embodiments. In order to accurately measure the length of the exposed portion of the insulating paper 230, the second length measuring member is provided on the outer wall of the main body 10. The main body 10 can extend into the space enclosing the insulating paper 200. The second length measuring member is provided with a scale line 222. That is, when the second measuring structure measures the length of the insulating paper 230, as the second positioning member 21 is inserted into the hole 240, the main body 10 also extends into the space enclosing the insulating paper 230 at the same time. The end of the main body 10 abuts against the end face 250 of the core 200. At this time, the length of the insulating paper 230 can be obtained from the reading of the scale line 222 on the main body 10, which can more accurately determine the accuracy of the length of the insulating paper 230. For example, this testing method is used when the battery model is changed on the production line, and the exposed length of the insulating paper 230 will also change significantly. At this time, the scale line 222 is used for precise measurement to improve the accuracy of length judgment. After the initial precise measurement is completed, the first measurement structure a can be used for rapid measurement in the future.

[0042] Understandably, when using this end for measurement, the outer diameter of the main body 10 is smaller than the inner diameter of the insulating paper 230, so that the main body 10 can be inserted into the space enclosed by the insulating paper 230.

[0043] In some embodiments, in order to enable the first positioning member 21 or the second positioning member 21 to be quickly inserted into the hole 240, the end 211 of the first positioning member 21 away from the main body 10 and / or the end 211 of the second positioning member 21 is a pointed tip. In this way, setting the end of the first positioning member or the second positioning member away from the main body 10 as a pointed tip has a guiding function, which can quickly align and insert it into the core 200, thereby improving measurement efficiency.

[0044] Understandably, the end 211 of the first positioning member can be set as a pointed tip, or the end 211 of the second positioning member can be set as a pointed tip, or both the ends 211 of the first positioning member and the second positioning member can be set as pointed tips.

[0045] In some implementations, the tip can be shaped like a cone, a sphere, an ellipse, etc., all of which can achieve the guiding effect.

[0046] In some embodiments, when selecting the materials for the entire measuring device 100, since the foil of the core 200 includes copper, aluminum, and is coated with substances such as lithium iron phosphate, the materials of the measuring structure 20 and the main body 10 should avoid using materials such as copper, aluminum, and lithium iron phosphate. Thus, the main body 10 and the two measuring structures 20 can be made of ceramic or stainless steel with a coating on the surface to avoid contact with the material of the core 200.

[0047] The aforementioned measuring device 100 allows the first or second positioning member to be inserted into the hole 240 of the core 200 by hand, and the length of the insulating paper 230 can be quickly and roughly determined by the positioning stage 221 in the first measuring structure a; or the length value can be accurately read by the scale line 222 in the second measuring member structure b. Thus, both methods are available.

[0048] (1) The length of the insulating paper 230 can be quickly judged on the production line without the core 200 being removed from the production line for a long time, without stopping the machine, thus ensuring production capacity and efficiency.

[0049] (2) It avoids the situation where the CCD misjudgment occurs when the colors of the finishing adhesive of the insulating paper 230 and the core 200 are similar;

[0050] (3) The length result can be obtained in a timely manner, which has the characteristics of high testing efficiency;

[0051] (4) The results can be obtained quickly and directly through the first measurement structure a or the second measurement structure b, without the need for unit conversion;

[0052] (5) The measuring device 100 in this embodiment has a simple structure and low manufacturing cost;

[0053] (6) On-site workers can complete the task, eliminating the need for highly professional testing personnel and reducing the company's labor costs;

[0054] (7) Since the core 200 does not need to be moved away from the production line, the collision damage to the core 200 after being moved away from the production line is avoided.

[0055] Example 2

[0056] Referring to Figure 2, in the second embodiment of this application, a method 300 for measuring the exposed length of insulating paper 230 is also provided, for measuring the length of the insulating paper 230 exposed relative to the core 200, including the following steps:

[0057] S31, hold the main body 10.

[0058] For example, a hand or robotic arm can be used to hold the main body 10 so that the entire measuring device 100 can be moved in the subsequent process.

[0059] In some implementations, the main body 10 is held by the worker's hand so that precise alignment can be achieved through the worker's eyes.

[0060] S32, insert the positioning member 21 into the hole 240 in the center of the core 200.

[0061] After holding and securing the main body 10 in the previous step, in this step, the positioning member 21 is inserted into the hole 240 in the center of the core 200. Depending on the required precise length data or a rough judgment, either the first positioning member or the second positioning member can be selectively inserted into the core 200.

[0062] S33, the length of the insulation paper 230 exposed relative to the core 200 is determined by the length measuring component 22.

[0063] When inserting the first or second positioning member into the core 200, it is necessary to ensure that the first or second positioning member and the central axis of the core 200 coincide. The exposed length of the insulating paper 230 is roughly or precisely judged by the positioning platform 221 in the first measuring structure a or the scale line 222 in the second measuring structure b.

[0064] In some implementations, if the exposed length of the insulating paper 230 is found to be non-compliant with the standard, the attachment position of the insulating paper 230 needs to be adjusted. After adjustment, the measurement step is repeated. If the measurement result is qualified, the core 200 is returned to the production line for the next step of production.

Claims

1. A measuring device (100) for measuring the length of the exposed insulating paper (230) at the end of a core (200), comprising: The main body (10) and at least one measuring structure (20) disposed on the main body (10), the measuring structure (20) including a positioning member (21) and a length measuring member (22), the positioning member (21) being used to extend into a hole (240) in the center of the core (200), and the length measuring member (22) being used to measure the exposed length of the insulating paper (230) relative to the core (200).

2. The measuring device (100) according to claim 1, wherein, The measuring device (100) includes two measuring structures (20), which are defined as a first measuring structure and a second measuring structure. The first measuring structure and the second measuring structure are respectively disposed at both ends of the main body (10) along the length direction of the main body (10). The first length measuring element in the first measuring structure is used to coarsely measure the length of the insulating paper (230) exposed relative to the core (200), and the second length measuring element in the second measuring structure is used to finely measure the length of the insulating paper (230) exposed relative to the core (200).

3. The measuring device (100) according to claim 2, wherein, The first length measuring element is disposed on the first positioning element of the first measuring structure, including a plurality of positioning platforms (221) connected sequentially along the axial direction of the main body (10), and the width of the plurality of positioning platforms (221) along the radial direction of the main body (10) is different.

4. The measuring device (100) according to claim 3, wherein, The width of the plurality of positioning stages (221) along the radial direction of the body (10) gradually increases toward the body (10).

5. The measuring device (100) according to claim 3 or 4, wherein, Each of the positioning stages (221) has a coating on its surface, and the color of the coating on the surface of each positioning stage (221) is different.

6. The measuring device (100) according to claim 3 or 4, wherein, Each of the positioning stages (221) is columnar.

7. The measuring device (100) according to claim 3 or 4, wherein, The length of the positioning stage (221) away from the main body (10) along the axial direction of the main body (10) is greater than the length of the other positioning stages (221) along the axial direction of the main body (10).

8. The measuring device (100) according to claim 3 or 4, wherein, The second length measuring element is disposed on the outer wall of the main body (10), the main body (10) can extend into the enclosing space of the insulating paper (230), and the second length measuring element is provided with scale lines (222).

9. The measuring device (100) according to any one of claims 2-4, wherein, The end (211) of the first positioning member of the first measuring structure and / or the end (211) of the second positioning member of the second measuring structure are pointed.

10. The measuring device (100) according to any one of claims 1-4, wherein, The measuring structure (20) and the main body (10) are integrally formed.

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