Area density measuring instrument auxiliary verification device and pole piece coating system

Abstract

The utility model relates to the technical field of secondary battery manufacturing, in particular to an auxiliary verification device of a surface density measuring instrument and a pole piece coating system. The auxiliary verification device comprises a roller passing assembly used for guiding a pole piece to the surface density measuring instrument; the detection unit is used for detecting whether the surface of the pole piece is coated; the surface density measuring instrument is used for scanning and measuring the coated pole piece; the sampling mechanism is used for sampling the coated pole piece and providing a sample for verification of the surface density measuring instrument; wherein the sampling mechanism is used for carrying out delayed sampling on the passing coated pole piece. According to the invention, the success rate of single-time measurement instrument verification can be improved, and the scrap amount of the coated pole piece can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to secondary battery manufacturing technical field, and more specifically, relate to a kind of area density measuring instrument auxiliary calibration device and pole piece coating system. BACKGROUND

[0002] Area density measuring instrument, also known as "weight measuring instrument" or "thickness measuring instrument", it can measure the area density of film products online, and can convert weight, thickness, etc. according to the characteristics of the film.

[0003] In the pole piece coating process, the pole piece and the coated pole piece need to be detected by the area density measuring instrument, such as the Chinese utility model patent with publication number CN218574124U. By measuring the area density, problems in the coating process can be found in time, such as uneven coating and inconsistent thickness, so that adjustments and optimizations can be made in time to improve production efficiency and product quality.

[0004] For the measuring instrument, it needs to be calibrated regularly to ensure the accuracy and stability of the data measured by the measuring instrument. For the calibration of the measuring instrument used before the pole piece coating, the pole piece of this model can be directly cut and measured, and the measured value can be compared with the value scanned by the measuring instrument, and then compensated, so that the calibration can be realized. For the calibration of the measuring instrument used for the coated pole piece, the pole piece of this model needs to be coated first, and then placed under the measuring instrument, and then the difference between the actual data of the scanning position and the scanning data of the measuring instrument is used to compensate the measuring instrument, so that the calibration can be realized. However, due to the slow rise of the pressure of the coating machine, the lower limit of the coating area density is reached, and if the pole piece with area density lower than the lower limit of the produced model is used for calibration, the measuring instrument may fail, so multiple measurements are needed for calibration. It is necessary to improve the low-efficiency calibration method. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide an auxiliary calibration device and a pole piece coating system that can improve the success rate of single measurement calibration and reduce the scrap rate of coated pole pieces.

[0006] To solve the above technical problems, the utility model provides an area density measuring instrument auxiliary calibration device, which comprises:

[0007] A roller assembly is used to guide the pole piece to the direction of the area density measuring instrument.

[0008] A detection unit is used to detect whether the pole piece surface is coated.

[0009] An area density measuring instrument is used to scan and measure the coated pole piece.

[0010] and a sampling mechanism for sampling the coated pole piece to provide a sample for the calibration of the areal density measuring instrument;

[0011] The sampling mechanism samples the coated pole piece that passes by.

[0012] In the above technical solution, further, the sampling mechanism is arranged at the rear side of the areal density measuring instrument to sample the coated pole piece after scanning measurement.

[0013] In any of the above technical solutions, further, the sampling mechanism comprises:

[0014] a support;

[0015] two samplers arranged oppositely on the support in the vertical direction;

[0016] and a driving part for driving the two samplers to move closer to or away from each other in the vertical direction.

[0017] The roller assembly is further used to transfer the coated pole piece to the two samplers, and when the two driving parts respectively drive the two samplers to move closer to each other, the two samplers act on the coated pole piece to complete the cutting sampling of the coated pole piece.

[0018] In any of the above technical solutions, further, the two samplers are adjustably arranged in the width direction of the pole piece.

[0019] In any of the above technical solutions, further, the sampling mechanism further comprises:

[0020] two supports arranged on the support in the vertical direction;

[0021] The two supports are each provided with a fixed shaft arranged in the width direction of the pole piece, and the two samplers are respectively slidably arranged on the fixed shafts of the two supports, and the sampling mechanism further comprises a locking member for adjusting the tightness of the samplers on the fixed shafts.

[0022] The driving part is used to drive the two supports to move closer to or away from each other in the vertical direction.

[0023] In any of the above technical solutions, further, the driving part is a pneumatic cylinder, a hydraulic cylinder or an electric cylinder.

[0024] In any of the above technical solutions, further, the sampling mechanism further comprises:

[0025] a material receiving table arranged on the support and located between the two samplers, and used to receive the coated pole piece cut by the samplers.

[0026] In any of the above technical solutions, further, the detection unit is a color difference sensor.

[0027] In any of the above technical solutions, further, the metering device meters the coated pole piece after the detection unit detects that the surface of the pole piece is coated.

[0028] In another aspect, a pole piece coating system is also provided, comprising:

[0029] a back roller, from which the pole piece moves;

[0030] a coating die for coating the pole piece on the back roller;

[0031] an oven for drying the just-coated pole piece;

[0032] and an areal density measuring instrument auxiliary calibration device as in any of the above technical solutions;

[0033] wherein the roller assembly guides the dried coated pole piece towards the areal density measuring instrument.

[0034] Beneficial effects: Compared with the prior art, the present application detects whether the pole piece is coated by the detection unit, and then the sampling mechanism cuts the coated pole piece, which can effectively guarantee the quality of the sample taken, thereby improving the calibration effect of the areal density measuring instrument. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0036] Figure 1 is a structural schematic diagram of the pole piece coating system of the present application;

[0037] Figure 2 is a structural schematic diagram of the sampling mechanism of the present application.

[0038] The following is an explanation of the reference signs:

[0039] 1, roller assembly; 2, detection unit; 3, areal density measuring instrument; 4, sampling mechanism; 41, bracket; 42, sampler; 43, driving part; 44, support; 45, fixed shaft; 46, locking piece; 47, material receiving table; 10, pole piece; 100, back roller; 200, coating die; 300, oven. DETAILED DESCRIPTION

[0040] Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part but not all of the embodiments of the present application, and the present application can be implemented in various ways. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative work fall within the scope of the present application.

[0041] It should be noted that, as shown in the present application and claims, unless the context clearly indicates otherwise, the words "one", "a", "an", and / or "the" do not mean to specify a single number, but also include a plurality. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements.

[0042] If the present application embodiments involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, motion condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0043] In the embodiments of the present application, unless otherwise specified and limited, the terms "connection", "fixing" and the like should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] In addition, if the present application embodiments involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes A scheme, or B scheme, or A and B schemes. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0045] The areal density refers to the mass distribution of an object per unit area, which describes the thickness or mass concentration of the material per unit area. In the polar plate coating process, the polar plate before and after coating needs to be detected by an areal density measuring instrument to ensure the quality and consistency of the product.

[0046] The areal density measuring instrument may be affected by various factors during use, such as environmental conditions, instrument aging, and use frequency, which may cause the measurement accuracy to decrease. Therefore, regular calibration is needed to timely discover and correct these deviations and ensure the measurement accuracy of the instrument. Currently, there is no efficient method for calibrating the areal density measuring instrument for coated polar plates. Therefore, the utility model provides an auxiliary calibration device and a polar plate coating system that can reduce the scrap rate of coated polar plates.

[0047] The auxiliary calibration device and the polar plate coating system will be described in detail below through the following examples.

[0048] Example 1

[0049] As shown in Figure 1 and Figure 2 , in this embodiment, an auxiliary calibration device for an areal density measuring instrument includes a roller assembly 1 for guiding the polar plate 10 towards the areal density measuring instrument 3; a detection unit 2 for detecting whether the polar plate 10 surface is coated; an areal density measuring instrument 3 for scanning and measuring the coated polar plate 10; and a sampling mechanism 4 for sampling the coated polar plate 10 to provide samples for calibration of the areal density measuring instrument 3.

[0050] The sampling mechanism 4 samples the coated polar plate with a delay.

[0051] The calibration of the areal density measuring instrument 3 is mainly based on the provided sample (coated polar plate), and the quality of the sample (whether it meets the standard) affects the calibration accuracy. The current sampling method is to cut a section of the polar plate, then coat the polar plate through the coating die 200, then cut the coated polar plate to a certain size, and then detect it through other equipment, then put the sample into the areal density measuring instrument 3 for scanning and detection, and finally compensate the measuring instrument through the data difference between the two. This method is not only cumbersome to operate, but also has a slow pressure rise during coating, which corresponds to the lower limit of the areal density of the coated polar plate. If the polar plate with an areal density below the lower limit of the produced model is used for calibration, it may cause the measuring instrument to fail, so multiple measurements are needed for calibration.

[0052] Based on this, the embodiment proposes an auxiliary checking device, which mainly comprises a passing roller assembly 1, a detection unit 2, a surface density measuring instrument 3 and a sampling mechanism 4. The passing roller assembly 1 is composed of multiple passing rollers and is used to guide the coated pole piece. The detection unit 2 is used to detect whether the pole piece is coated. Then the sampling mechanism 4 cuts the coated pole piece to complete sampling. The sampled coated pole piece is detected, and then the surface density measuring instrument 3 is checked through the detection data.

[0053] It should be noted that the sampling mechanism 4 of the embodiment samples the coated pole piece with a delay, which means that the pole piece sampled by the sampling mechanism 4 bypasses the coating part of the coating machine, thereby improving the sampling quality. The delayed sampling mode is that after the detection unit 2 detects that the surface of the pole piece is coated, the timing starts. Then, according to the moving speed of the pole piece, the time when the coating part of the pole piece reaches the position of the sampling mechanism 4 is calculated. Then the sampler 42 is controlled to sample with a delay, so as to avoid sampling the coating part of the pole piece.

[0054] In the embodiment, the sampling mechanism 4 is arranged at the rear side of the surface density measuring instrument 3 to sample the coated pole piece after scanning measurement, so as to facilitate operation and improve checking efficiency. That is to say, the sampled pole piece first passes through the surface density measuring instrument 3 and is detected, and then is sampled. Then only the sampling sample needs to be detected by other instruments, so two data can be obtained. If sampling is performed first, the sampled sample needs to be placed on the surface density measuring instrument 3 for measurement by manual operation, thereby prolonging the detection time.

[0055] In the embodiment, the detection unit 2 is a color difference sensor. The color difference sensor is a sensor for measuring color difference of an object, which can detect very small color difference and can convert the difference into a digital signal output. When the color difference sensor recognizes the paste coated on the pole piece, the detection data will change, which indicates that the coated pole piece has been detected.

[0056] Since the moving speed of the pole piece fluctuates to a certain extent, in order to ensure the sampling quality and reduce the scrap quantity of the coated pole piece, the auxiliary checking device further comprises a meter counter. After the detection unit 2 detects that the surface of the pole piece is coated, the meter counter counts the meter number of the coated pole piece. After the detection unit 2 detects the coating part of the pole piece, the meter counter starts counting the meter number. When the set meter number is reached, the movement of the pole piece is controlled to stop, and then the sampling mechanism 4 is controlled to sample.

[0057] Embodiment two:

[0058] The embodiment is a further improvement based on the embodiment one.

[0059] As Figure 1 andFigure 2 As shown, in this embodiment, the sampling mechanism 4 includes: a support 41; two samplers 42, which are arranged vertically opposite each other on the support 41; and a driving unit 43 for driving the two samplers 42 to move closer or further apart from each other in the vertical direction.

[0060] The roller assembly 1 is also used to move the coated electrode sheet between the two samplers 42. When the two drive units 43 drive the two samplers 42 to approach each other, the two samplers 42 act on the coated electrode sheet to complete the cutting and sampling of the coated electrode sheet. The two legs on the bracket 41 are installed on both sides of the electrode sheet. The two samplers 42 are located above and below the electrode sheet, respectively. The drive unit 43 drives the two samplers 42 to approach each other. Under the interaction of the two samplers 42, the blades on the samplers 42 are misaligned, so that the cutting force on the upper and lower surfaces of the electrode sheet is cut and trimmed by the blades on the samplers 42.

[0061] In this embodiment, it should be noted that the drive unit 43 is a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder. By automatically controlling the sampler 42 to move up and down, the electrode sheet can be cut and sampled, making operation convenient.

[0062] Example 3:

[0063] This embodiment is a further improvement based on Embodiment 2.

[0064] like Figure 2 As shown in this embodiment, since the width of different types of electrodes is also different, in order to improve applicability, the two samplers 42 are adjustable in the electrode width direction.

[0065] Specifically, the sampling mechanism 4 further includes: two supports 44, which are arranged vertically on the bracket 41; wherein, each of the two supports 44 has a fixed shaft 45 arranged along the width direction of the electrode sheet, and the two samplers 42 are respectively slidably arranged on the fixed shafts 45 on the two supports 44. The sampling mechanism 4 further includes: a locking member 46 for adjusting the tightness of the samplers 42 on the fixed shafts 45.

[0066] The drive unit 43 is used to drive the two supports 44 to move closer or further apart in the vertical direction.

[0067] Two drive units 43 are symmetrically installed on the upper and lower sides of the bracket 41, and the support 44 is installed on the output end of the drive unit 43. The sampler 42 is installed on the fixed shaft 45 of the support 44. By adjusting the locking member 46, the sampler 42 can slide on the fixed shaft 45. After sliding to the set position, the locking member 46 can be locked. The structure is simple and the operation is convenient.

[0068] Example 4:

[0069] This embodiment is a further improvement based on Embodiment 2 or Embodiment 3.

[0070] like Figure 2 As shown, in this embodiment, the sampling mechanism 4 further includes a receiving platform 47, which is disposed on the bracket 41 and located between the two samplers 42, for receiving the coated electrode sheets cut by the samplers 42.

[0071] After the two samplers 42 cut the electrode sheet and the samplers 42 are restored, the cut electrode sheet falls downwards under its own gravity. To prevent it from falling to the ground, a receiving platform 47 is provided to collect the cut electrode sheet. The receiving platform 47 has an opening for the lower sampler 42 to pass through. When the lower sampler 42 moves upwards, it passes through the receiving platform 47 and docks with the upper sampler 42 to achieve the cutting of the electrode sheet.

[0072] Example 5:

[0073] like Figure 1 and Figure 2 As shown, this embodiment proposes an electrode coating system, including: a back roller 100, on which the electrode 10 moves; a coating die 200 for coating the electrode 10 on the back roller 100; an oven 300 for drying the electrode 10 after coating; and an areal density measuring instrument 3 as described in any of the above embodiments as an auxiliary verification device.

[0074] The roller assembly 1 guides the dried coated electrode sheet 10 toward the areal density measuring instrument 3.

[0075] After the pole piece is pulled through the coating die 200, the coating die 200 is started to coat the pole piece, so that a slurry layer is formed on the surface of the pole piece, and then the pole piece passes through the oven 300. The oven 300 dries the slurry on the surface of the pole piece, so that the "wet film" becomes a "dry film". Subsequently, the pole piece passes through the detection unit 2. When the detection unit 2 identifies that the pole piece surface has been coated, the meter counter is started to count the meters. After the set number of meters is identified, the control system of the coating system controls the pole piece to stop moving. At this time, the pole piece located below the sampling mechanism 4 is the coated pole piece, and the coated part of the pole piece has been bypassed. Subsequently, the control driver controls the sampler 42 to sample the coated pole piece. The sampled pole piece has been scanned and measured by the area density measuring instrument 3. The sampled pole piece only needs to be detected by other instruments, and the difference between the two data can be used to calibrate the area density measuring instrument 3. After the calibration is completed, the coating system is started again, and the calibrated density measuring instrument continues to detect the coated pole piece. By installing the auxiliary calibration device on the pole piece coating system, the purpose of online calibration is achieved, and the scrap quantity of the coated pole piece (the scrap quantity refers to the part of the pole piece detected by the area density measuring instrument 3 before calibration) is reduced.

[0076] The above has described various embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical applications, or improvements to the technology in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. An auxiliary calibration device for an areal density measuring instrument, characterized in that, The application relates to a surface density measuring device and a surface density measuring device auxiliary calibration device. The application comprises: a passing roller assembly (1) for guiding the polar sheet to a surface density measuring device (3); a detection unit (2) for detecting whether the polar sheet surface is coated; the surface density measuring device (3) for scanning and measuring the coated polar sheet; and a sampling mechanism (4) for sampling the coated polar sheet to provide a sample for calibration of the surface density measuring device (3); 2. The areal density gauge (3) auxiliary check device according to claim 1, characterized in that, wherein the sampling mechanism (4) samples the passing coated polar sheet with a time delay.

3. The device for checking the areal density gauge (3) according to claim 1, characterized in that, The sampling mechanism (4) is arranged at the rear side of the surface density measuring device (3) to sample the coated polar sheet after scanning and measuring. The sampling mechanism (4) comprises: a support (41); two samplers (42) arranged oppositely on the support (41); and a driving part (43) for driving the two samplers (42) to move close to or away from each other along the vertical direction; 4. The device for checking the areal density meter (3) according to claim 3, characterized in that wherein the passing roller assembly (1) is also used for transferring the coated polar sheet to the space between the two samplers (42); when the two driving parts (43) drive the two samplers (42) to move close to each other, the two samplers (42) act on the coated polar sheet to complete the sampling of the coated polar sheet.

5. The device for checking the areal density meter (3) according to claim 4, characterized in that, The two samplers (42) are arranged adjustably along the width direction of the polar sheet. The sampling mechanism (4) further comprises: two supports (44) arranged oppositely on the support (41); wherein each of the two supports (44) is provided with a fixed shaft (45) arranged along the width direction of the polar sheet, and the two samplers (42) are slidingly arranged on the fixed shafts (45) of the two supports (44), and the sampling mechanism (4) further comprises a locking member (46) for adjusting the tightness of the samplers (42) on the fixed shafts (45); 6. The device for checking the areal density meter (3) according to claim 5, characterized in that, and the driving part (43) is used for driving the two supports (44) to move close to or away from each other along the vertical direction.

7. The device for checking the areal density meter (3) according to claim 5, characterized in that, The driving part (43) is a pneumatic cylinder, a hydraulic cylinder or an electric cylinder. The sampling mechanism (4) further comprises:

8. The device for checking the areal density measuring instrument (3) according to any of claims 1 to 7, characterized in that, a receiving table (47) arranged on the support (41) and located between the two samplers (42) and used for receiving the coated polar sheet cut by the samplers (42).

9. The areal density gauge (3) auxiliary check device according to claim 8, characterized in that, The detection unit (2) is a color difference sensor. The application further comprises:

10. A pole piece coating system characterized by, a metering device for metering the coated polar sheet after the detection unit (2) detects that the polar sheet surface is coated. The application comprises: a back roller (100) from which the polar sheet moves; a coating die (200) for coating the polar sheet on the back roller (100); an oven (300) for drying the polar sheet after coating; and the surface density measuring device auxiliary calibration device according to any one of claims 1-9; wherein the passing roller assembly (1) guides the dried coated polar sheet to the surface density measuring device (3).

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