CN118009950A - Pole piece detection method and detection system - Google Patents
Pole piece detection method and detection system Download PDFInfo
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Abstract
The invention relates to the technical field of pole piece detection, in particular to a pole piece detection method and a pole piece detection system. In the pole piece detection process of the pole piece detection device, the detection range of the pole piece detection device is adjusted according to the position information of the first boundary and the position information of the second boundary by acquiring the position information of the pole piece boundary, the detection range of the pole piece detection device can be increased for pole pieces with large-size width, the detection range of the pole piece detection device can be reduced for pole pieces with small-size width, the pole piece detection range is matched with the width of the pole piece, and therefore redundant travel and redundant data of the pole piece detection device can be reduced, and the detection efficiency of the pole piece is improved.
Description
Technical Field
The invention relates to the technical field of pole piece detection, in particular to a pole piece detection method and a pole piece detection system.
Background
The lithium battery has the outstanding advantages of higher energy density, long service life, high rated voltage, high power, extremely low self-discharge rate, light weight, strong high-low temperature adaptability, environment friendliness and the like. With the development of technology, lithium batteries have become one of the mainstream batteries, and are the best power source for mobile electronic devices, electric vehicles and various electronic products.
The lithium ion battery mainly comprises a positive plate, a negative plate, electrolyte, a separation film, a tab and a packaging shell. In the manufacturing and detecting processes of the positive plate and the negative plate, the accuracy of measuring the boundary position of the positive plate directly influences the production effect of the positive plate, thereby influencing the performance of the final battery finished product. Therefore, the accuracy of detecting the boundary of the pole piece needs to be improved, the good detection effect of the pole piece is ensured, and the yield of lithium battery production is improved.
The current pole piece width dimension specification types are more, and the stroke range of the pole piece detection device in the pole piece width direction is large, so that the pole piece detection device can adapt to pole pieces with different widths. However, when the pole piece detection device detects the pole piece with smaller width, the redundant travel of the pole piece detection device is large, the scanning time is too long, and the detection efficiency is affected. In addition, the pole piece detection device continuously detects redundant data in a redundant travel, and a data processing system eliminates the redundant data, so that more time and more calculation resources are needed, and the detection efficiency and the stability of a calculation system are affected.
Disclosure of Invention
The invention provides a pole piece detection method and a pole piece detection system, which are used for solving the technical problem that the detection efficiency of the existing pole piece detection device is low in the detection process.
According to a first aspect, in one embodiment, a pole piece detection method is provided, and a pole piece is detected online by a pole piece detection device, so that position information of a first boundary and position information of a second boundary in a width direction of the pole piece are obtained; and adjusting the detection range of the pole piece detection device according to the position information of the first boundary and the position information of the second boundary.
Further, in an embodiment, the adjusting the detection range of the pole piece detection device includes:
The method comprises the steps that position information of a first boundary and position information of a second boundary are acquired for multiple times through a boundary acquisition device, and the detection range of a pole piece detection device is adjusted according to the position information of the first boundary and the position information of the second boundary acquired for multiple times by the boundary acquisition device; the detection range is the scanning range of the pole piece detection device in the width direction of the pole piece.
Further, in an embodiment, the boundary acquisition device and the pole piece detection device move synchronously, and the pole piece detection device performs on-line detection on the pole piece while the boundary acquisition device acquires the position information of the first boundary and the position information of the second boundary.
Further, in an embodiment, two boundaries of the detection area of the pole piece detection device in the pole piece width direction are a first detection boundary and a second detection boundary, where the first detection boundary, the first boundary, the second boundary and the second detection boundary are sequentially arranged, the first detection boundary is located at a side of the first boundary away from the second boundary, and the second detection boundary is located at a side of the second boundary away from the first boundary.
Further, in an embodiment, the pole piece detecting device detects the area between the first boundary and the second boundary at a constant speed, and the pole piece detecting device detects the area between the first boundary and the first detection boundary at an acceleration or a deceleration, and detects the area between the second boundary and the second detection boundary at an acceleration or a deceleration.
Further, in one embodiment, the boundaries between the two thinned coating regions and the non-thinned coating region on the pole piece are a first thinned coating boundary and a second thinned coating boundary, respectively, the first boundary, the first thinned coating boundary, the second thinned coating boundary and the second boundary are sequentially arranged in the width direction of the pole piece, the pole piece detection device detects the region between the first boundary and the first thinned coating boundary at an average speed V1, and the region between the second boundary and the second thinned coating boundary at an average speed V2, and the region between the first thinned coating boundary and the second thinned coating boundary at an average speed V3, V3 > V1 and V3 > V2.
Further, in an embodiment, the pole piece detecting device detects the area between the first thinned coating boundary and the second thinned coating boundary at a constant speed.
Further, in an embodiment, the pole piece detecting device detects the region between the first boundary and the first thinned coating boundary in an acceleration or deceleration or uniform speed manner, and detects the region between the second boundary and the second thinned coating boundary in an acceleration or deceleration or uniform speed manner.
Further, in an embodiment, boundaries between two thinned coating regions and a non-thinned coating region on the pole piece are a first thinned coating boundary and a second thinned coating boundary, the first thinned coating boundary, the second thinned coating boundary and the second boundary are sequentially arranged in the width direction of the pole piece, the pole piece detection device detects a region between the first boundary and the second boundary at a constant speed, the pole piece detection device samples a region between the first boundary and the first thinned coating boundary at A1 frequency, samples a region between the second boundary and the second thinned coating boundary at A2 frequency, samples a region between the first thinned coating boundary and the second thinned coating boundary at A3, A1 > A3 and A2 > A3.
Further, in one embodiment, the position information of the first thinning coating boundary is set according to the position information of the first boundary and the position information of the second boundary, and the position information of the second thinning coating boundary is set.
In a second aspect, an embodiment provides a pole piece detection system for implementing the pole piece detection method in any one of the embodiments of the first aspect, including:
The pole piece detection device is used for detecting the pole piece conveyed by the pole piece conveying mechanism on line;
the driving device is used for driving the pole piece detection device to move;
the boundary acquisition device is used for acquiring the position information of the first boundary and the position information of the second boundary in the width direction of the pole piece;
the control system is connected with the driving device to control the reciprocating motion of the pole piece detection device; the control system is connected with the boundary acquisition device to acquire data of the boundary acquisition device; the control system can respond to the data of the boundary acquisition device to adjust the detection range of the pole piece detection device.
Further, in an embodiment, the boundary collecting device and the pole piece detecting device share the driving device, so that the boundary collecting device and the pole piece detecting device synchronously move.
Further, in one embodiment, the driving device drives the pole piece detection device and the boundary acquisition device to move at the same time, the control system comprises a driving control system and a pole piece detection control system, the driving device comprises a position metering element, and the driving control system is electrically connected with the position metering element and the boundary acquisition device so that the driving control system can read signals of the position metering element and receive signals of the boundary acquisition device; the driving control system is in signal connection with the pole piece detection control system and is used for sending a position signal to the pole piece detection control system.
According to the pole piece detection method of the embodiment, in the pole piece detection process of the pole piece detection device, the detection range of the pole piece detection device is adjusted according to the position information of the first boundary and the position information of the second boundary by acquiring the position information of the boundary of the pole piece, the detection range of the pole piece detection device can be increased for pole pieces with large size width, the detection range of the pole piece detection device can be reduced for pole pieces with small size width, and the pole piece detection range is matched with the width of the pole piece, so that redundant travel and redundant data of the pole piece detection device can be reduced, and the detection efficiency of the pole piece is improved.
Drawings
FIG. 1 is a state diagram of a pole piece detection system in detecting a pole piece in one embodiment;
FIG. 2 is a top view of a portion of the structure of a pole piece detection system in one embodiment;
FIG. 3 is an isometric view of a portion of the structure of a pole piece detection system in one embodiment;
FIG. 4 is a schematic diagram illustrating the positions of a first boundary and a second boundary of a pole piece in a pole piece detection method according to an embodiment;
FIG. 5 is a block diagram of a pole piece detection system in one embodiment;
FIG. 6 is a flow chart of a detection system employing the pole piece of FIG. 5;
FIG. 7 is another block diagram of a pole piece detection system in one embodiment;
FIG. 8 is a flow chart of a pole piece detection system employing the pole piece detection system of FIG. 7;
Fig. 9 is a schematic diagram of a detection result of the pole piece detection device on the pole piece area density in an embodiment.
List of feature names corresponding to reference numerals in the figure: 1. a pole piece detection device; 11. a bracket; 111. an upper bracket body; 112. a lower bracket body; 12. a bracket base; 13. a pole piece detection mechanism; 131. a first pole piece detection mechanism; 132. a second pole piece detection mechanism; 2. a pole piece; 21. a first boundary; 22. a second boundary; 3. a boundary acquisition device; 31. a pole piece boundary detection mechanism; 4. a driving device; 41. a position metering element; 410. an encoder; 42. a base; 43. a driving motor; 44. a screw rod connecting seat; 45. a screw rod; 46. a screw rod mounting seat; 47. a guide rail; 5. a drive control system; 6. and the pole piece detection control system.
Description of bracketed reference numerals in the drawings: in the bracketed reference numerals in the drawings, features indicated by the reference numerals are features indicated by both numerals in the brackets and numerals outside the brackets.
Detailed Description
The application will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present application have not been shown or described in the specification in order to avoid obscuring the core portions of the present application, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated.
In one embodiment, referring to fig. 1 to 3, the pole piece detection method includes the following steps: the pole piece 2 is detected on line by the pole piece detecting device 1, and the position information of the first boundary 21 and the position information of the second boundary 22 in the width direction of the pole piece 2 are obtained. The detection range of the pole piece detection device 1 is adjusted based on the position information of the first boundary 21 and the position information of the second boundary 22.
The detection range of the pole piece detection device 1 described in the present application refers to the scanning range of the pole piece detection device 1 in the width direction of the pole piece 2.
According to the application, the detection range of the pole piece detection device 1 is adjusted by the acquired position information of the two boundaries in the width direction of the pole piece 2 so as to adapt to the detection of pole pieces 2 with different sizes. Specifically, for the pole piece 2 with large size width, the detection range of the pole piece detection device 1 can be increased, for the pole piece 2 with small size width, the detection range of the pole piece detection device 1 can be reduced, so that the detection range of the pole piece detection device 1 is matched with the width of the pole piece 2, and the redundant travel and redundant data of the pole piece detection device 1 can be reduced, thereby improving the detection efficiency of the pole piece 2.
In addition, in one embodiment, in the process of carrying out on-line detection on the pole piece 2, the pole piece 2 is a continuous strip pole piece, and is always in a moving state through a pole piece conveying mechanism, and in one embodiment, the pole piece conveying mechanism conveys the pole piece 2 along the length direction.
Further, in one embodiment, referring to fig. 1, adjusting the detection range of the pole piece detection device 1 includes:
the position information of the first boundary 21 and the position information of the second boundary 22 are acquired by the boundary acquisition device 3 for a plurality of times, and the detection range of the pole piece detection device 1 is adjusted according to the position information of the first boundary 21 and the position information of the second boundary 22 acquired by the boundary acquisition device 3 for a plurality of times.
Specifically, in one embodiment, referring to fig. 1 to 3, after the boundary collecting device 3 is controlled to reciprocate n times to remove the abnormal data, an average value of the position information of the first boundary 21 and an average value of the position information of the second boundary 22 obtained by n times of movement are obtained, the average value of the position information of the first boundary 21 and the average value of the position information of the second boundary 22 are taken as accurate boundary position information of the pole piece 2, and the detection range of the pole piece detecting device 1 is adjusted according to the obtained average value.
The information acquired by the boundary acquisition device 3 can be suitable for pole pieces with different sizes, and the detection range of the pole piece detection device 1 can be calibrated at fixed time.
In some other embodiments, the detection range of the pole piece detection device 1 can also be adjusted in real time according to the acquired data of the boundary acquisition device 3.
Further, in an embodiment, referring to fig. 1 to 3, the boundary collecting device 3 and the pole piece detecting device 1 move synchronously, and the pole piece detecting device 1 detects the pole piece 2 on line while the boundary collecting device 3 collects the position information of the first boundary 21 and the position information of the second boundary 22. In some other embodiments, the pole piece detection device 1 and the boundary acquisition device 3 may not move synchronously, for example, the boundary acquisition device 3 and the pole piece detection device 1 move independently, the boundary acquisition device 3 is driven by an independent boundary driving device, and the pole piece detection device 1 is driven by an independent pole piece driving device.
Further, in an embodiment, referring to fig. 1 and fig. 4, two boundaries of the detection area of the pole piece detection device 1 in the width direction of the pole piece 2 are a first detection boundary and a second detection boundary, respectively. In the width direction of the pole piece 2, the detection line of the pole piece detection device 1 carries out on-line detection on the pole piece 2 between a first detection boundary and a second detection boundary. In the width direction of the pole piece 2, a first detection boundary, a first boundary 21, a second boundary 22, and a second detection boundary are arranged in this order, the first detection boundary being on a side of the first boundary 21 away from the second boundary 22, the second detection boundary being on a side of the second boundary 22 away from the first boundary 21. Thus, the pole piece detection device 1 can fully scan the pole piece 2, and omission is avoided. Specifically, referring to fig. 4, the first boundary 21 is located at a 'and the second boundary 22 is located at B', where the first detection boundary is located in a region between a and a ', and the second detection boundary is located in a region between B and B'. It should be noted that the position of the first detection boundary may coincide with the position of the first boundary 21, and the position of the second detection boundary may coincide with the position of the second boundary 22.
In the scanning process of the pole piece detecting device 1, the detection line of the pole piece detecting device 1 reciprocates between a first detection boundary and a second detection boundary to detect the pole piece 2 on line, wherein the first detection boundary and the second detection boundary are respectively a starting point and an end point in one detection stroke of the pole piece detecting device 1. In one detection stroke, the pole piece detection device 1 starts to detect the pole piece 2 from the first detection boundary, continuously detects the pole piece 2 in the movement process of the second detection boundary, stops moving after detecting the second detection boundary, starts the second detection stroke, and in the second detection stroke, the pole piece detection device 1 starts to perform online detection on the pole piece 2 from the second detection boundary, continuously detects the pole piece 2 in the movement process of the first detection boundary, and stops moving after detecting the first detection boundary.
It should be understood that the first detection boundary and the second detection boundary refer to detection boundary positions of the pole piece detection device 1, a detection region being a region through which the detection line of the pole piece detection device 1 passes when the pole piece detection device 1 moves, and the detection line detects the pole piece 2 when passing the pole piece 2, and the pole piece is in the detection region. For example, in one embodiment, during the reciprocation of the pole piece detecting device 1, the detection line reciprocates and scans between the first detection boundary and the second detection boundary, that is, the area between the first detection boundary and the second detection boundary is the scanning detection area of the detection line.
Still further, referring to fig. 1, the pole piece detecting device 1 detects the area between the first boundary 21 and the second boundary 22 at a constant speed, and the pole piece detecting device 1 detects the acceleration or deceleration between the first boundary 21 and the first detecting boundary and the acceleration or deceleration between the second boundary 22 and the second detecting boundary. And uniformly detecting the region, namely enabling the detection line to uniformly move through the region, and similarly, performing acceleration detection on the region, namely enabling the detection line to accelerate to move through the region, and performing deceleration detection on the region, namely enabling the detection line to decelerate to move through the region. The accelerating stroke or the decelerating stroke of the driving device 4 is fully utilized, so that the driving device 4 scans the area between the first detection boundary and the first boundary 21 or detects the area between the second detection boundary and the second boundary 22 during the accelerating stroke and the decelerating stroke, the purpose of realizing uniform speed detection of the pole piece 2 is not influenced, and the redundant stroke of the pole piece detecting device 1 is shortened. That is, the region between the first boundary 21 and the first detection boundary is at the start or end of the single detection stroke of the pole piece detecting device 1, and at the start, the pole piece detecting device 1 performs acceleration detection and at the end, the pole piece detecting device performs deceleration detection. Similarly, the area between the second boundary 22 and the second detection boundary is also at the start end or the end of the single detection stroke of the pole piece detection device 1, and when at the start end, the pole piece detection device 1 performs acceleration detection on the pole piece detection device, and when at the end, the pole piece detection device performs deceleration detection on the pole piece detection device.
Specifically, in one embodiment, the average detection speed of the pole piece detection device between the first boundary and the first detection boundary is smaller than the average detection speed of the pole piece detection device between the first boundary and the second boundary, and the average detection speed of the pole piece detection device between the second boundary and the second detection boundary is smaller than the average detection speed of the pole piece detection device between the first boundary and the second boundary.
When the driving device 4 drives the pole piece detecting device 1 to move, there are an acceleration section and a deceleration section, for example, in one embodiment, the detection line of the pole piece detecting device 1 starts to detect from the first detection boundary, and in the process of moving to the second detection boundary, the pole piece detecting device 1 accelerates first, accelerates to a target speed and then moves at a uniform speed, and starts to decelerate before reaching a set position, and stops moving until moving to the set position. In the process, the detection line accelerates to the second detection boundary firstly, moves at a uniform speed after reaching the speed, then starts decelerating before reaching the second detection boundary, and stops moving when reaching the second detection boundary. Of course, in some other embodiments, the movement form of the pole piece detecting device 1 can be arbitrarily adjusted according to the needs, for example, the pole piece detecting device may not have uniform movement in the detecting stroke.
The following is illustrative with reference to the accompanying drawings:
Referring to fig. 4, the first detection boundary of the current pole piece detecting device 1 is a, the second detection boundary is B, the first boundary 21 of the pole piece 2 is a 'and the second boundary 22 is B' after multiple round trips, the area between a and a 'and the area between B and B' can be detected during the moving process of the pole piece detecting device 1, on the one hand, the moving time of the pole piece detecting device 1 is increased, on the other hand, the pole piece detecting device 1 additionally collects redundant data, undoubtedly, the number of data analysis and processing is increased, resulting in increased calculating time and calculating cost, and the two aspects commonly affect the measuring precision and efficiency of the whole pole piece 2.
In order to improve the detection efficiency, in one embodiment, please refer to fig. 4, the first detection boundary of the pole piece detection device 1 is adjusted to be a ', and the second detection boundary is adjusted to be B', so that the running path of the pole piece detection device 1 is shortened, the collection of redundant data is reduced, and the measurement accuracy and time of the whole pole piece 2 are effectively improved.
In one embodiment, referring to fig. 4, after the first detection boundary of the pole piece detecting device 1 is adjusted to a ', and the second detection boundary is adjusted to B', the driving device 4 is started and stopped directly above a 'B', and the whole process from starting to stopping of the driving device 4 of the pole piece detecting device 1 is to sample the data of the pole piece 2 effectively because the linear motion process of the driving device 4 involves acceleration, uniform speed and deceleration processes, and the acceleration and deceleration of the driving device 4 requires a period of time, which results in dense (acceleration), sparse (uniform speed) and dense (deceleration) distribution of sampling points on a 'B' because the sampling frequency of the pole piece detecting device 1 is generally fixed. In order to ensure the consistency of detection of each part of the pole piece 2, a '+a0 is taken as a first detection boundary, wherein A0 is a stroke required by the driving device 4 when accelerating from 0 to a preset constant speed, and B' +b0 is taken as a second detection boundary, wherein B0 is a stroke required by the driving device 4 when decelerating from the preset constant speed to 0, so that the process of data acquisition of the pole piece 2 by the pole piece detection device 1 is at a constant speed, and the consistency of sampling density of each point of the pole piece 2 is ensured.
In one embodiment, referring to fig. 1, two boundaries in the width direction of the non-thinned coating region on the pole piece 2 are a first thinned coating boundary and a second thinned coating boundary, respectively. The non-thinned coating region is located between the two thinned coating regions in the width direction of the pole piece, the first thinned coating boundary is the boundary between one thinned coating region and the non-thinned coating region, and the second thinned coating boundary is the boundary between the other thinned coating region and the non-thinned coating region.
It should be noted that, the coating area of the pole piece and the non-coating area are relatively, and typically the coating area of the pole piece includes the coating area of the thinning and the non-thinning, but due to the influence of the process and other factors, in the coating area of the pole piece, the coating area of the thinning is located at the edge of the coating area, the non-thinning coating area is located in the middle, the coating of the thinning coating area is thinner and uneven, and the coating of the non-thinning coating area is thicker and more uniform.
In addition, there is usually a non-coating area on the pole piece besides the coating area, the non-coating area is usually located at the edge of the pole piece, the non-coating area can include a plurality of different types of areas, for example, can include a side edge area located at least one side of the width direction of the pole piece, and the side edge area can avoid the coating from leaking out during coating; for another example, the welding device can further comprise a welding area for welding the tabs, wherein the welding area is usually arranged at two ends of the length direction of the single tab; for another example, the method can further comprise cutting out the area of the tab by cutting.
In one embodiment, after the pole piece detection device detects the pole piece, the surface density information of the coating area is obtained from the detection data, and the coating quality of the coating area can be obtained according to the surface density information of the coating area.
The width of the non-thinned coating area on the pole piece 2 is smaller than the width of the pole piece 2. The first boundary 21, the first thinned coating boundary, the second thinned coating boundary, and the second boundary 22 are arranged in this order in the width direction of the pole piece 2, the pole piece detecting device 1 detects the region between the first boundary 21 and the first thinned coating boundary at an average speed V1, and detects the region between the second boundary 22 and the second thinned coating boundary at an average speed V2, and detects the region between the first thinned coating boundary and the second thinned coating boundary at an average speed V3, V3 > V1, and V3 > V2.
Specifically, in one embodiment, the pole piece detection device 1 detects the area between the first thinned coating boundary and the second thinned coating boundary at a constant speed V3. In some other embodiments, the pole piece detection device 1 may also be an acceleration detection and/or a deceleration detection for the area between the first thinned coating boundary and the second thinned coating boundary, as desired.
Specifically, in one embodiment, referring to fig. 1, 4 and 9, the pole piece detection device 1 performs acceleration detection or deceleration detection on the area between the first boundary 21 and the first thinned coating boundary, and performs acceleration detection or deceleration detection on the area between the second boundary 22 and the second thinned coating boundary. That is, the region between the first boundary 21 and the first thinned coating boundary is at the start or end of the single detection stroke of the pole piece detecting device 1, where the pole piece detecting device 1 performs acceleration detection and at the end, where the pole piece detecting device performs deceleration detection. Similarly, the area between the second border 22 and the second thinned coating border is also at the beginning or end of the single detection stroke of the pole piece detection device 1, and when at the beginning, the pole piece detection device 1 performs acceleration detection on the same, and when at the end, the pole piece detection device performs deceleration detection on the same.
Referring to fig. 9, the non-thinned coating region is located on two sides of the non-thinned coating region, and the situation of the thinned coating region on the pole piece 2 is more complex than that of the non-thinned coating region of the pole piece 2, and the time for the pole piece detection device 1 to pass through the thinned coating region can be prolonged by performing acceleration detection or deceleration detection on the thinned coating region of the pole piece 2, so that a denser sampling density is obtained, and the denser sampling density is more suitable for analyzing the thinned coating region. Meanwhile, the acceleration detection or the deceleration detection fully utilizes the acceleration stroke and the deceleration stroke of the driving device 4, and shortens the redundant stroke and redundant data of the pole piece detection device 1.
The examples are detailed below: referring to fig. 4, let one of the thinned coating regions of the pole piece 2 be A1 and the other be B1, compensate A1 to the first detection boundary, and obtain the position data of the first detection boundary as a' +a0-A1, so that the pole piece detecting device 1 can obtain more sampling data for one thinned coating region for subsequent analysis. Similarly, B1 is compensated to the second detection boundary, and the position data of the second detection boundary is B' +b0-B1, so that the pole piece detection device 1 can obtain more sampling data for another thinned coating region for subsequent analysis.
In some other embodiments, the pole piece detection device 1 may also detect the area between the first boundary 21 and the first thinned coating boundary at a constant speed, and detect the area between the second boundary 22 and the second thinned coating boundary at a constant speed.
Further, in an embodiment, referring to fig. 1, in addition to the control of the sampling density through speed, the control of the sampling density can be also realized through selecting the pole piece detecting device 1 with dynamically adjustable sampling density.
The two boundaries in the width direction of the coating area on the pole piece 2 are a first thinning coating boundary and a second thinning coating boundary respectively, the first boundary 21, the first thinning coating boundary, the second thinning coating boundary and the second boundary 22 are sequentially arranged in the width direction of the pole piece 2, the pole piece detection device 1 moves at a uniform speed between the first boundary 21 and the second boundary 22, the sampling frequency of the pole piece detection device 1 between the first boundary 21 and the first thinning coating boundary is A1, the sampling frequency between the second boundary 22 and the second thinning coating boundary is A2, the sampling frequency between the first thinning coating boundary and the second thinning coating boundary is A3, A1 is more than A3 and A2 is more than A3. By controlling the sampling frequency of the pole piece detection device 1, the control of the sampling density is easier to realize, and A1 is more than A3 and A2 is more than A3, so that the thinner coating area can obtain a denser sampling density.
Further, in one embodiment, the position information of the first thinning coating boundary is set according to the position information of the first boundary 21 and the position information of the second boundary 22, and the position information of the second thinning coating boundary is set. Since the coating width of the pole piece 2 is a set value, the boundary of the coating area can be calculated according to the position information of the first boundary 21 and the position information of the second boundary 22, and the boundary information of the coating area is not required to be detected, so that the amount of data to be processed is reduced, and the processing speed of the data can be improved.
In one embodiment, please refer to fig. 1 to 8, a pole piece detection system for implementing the pole piece detection method in any one of the above embodiments is provided, where the pole piece detection system includes a pole piece detection device 1, a driving device 4, a boundary acquisition device 3 and a control system. The pole piece detection device 1 is used for carrying out on-line detection on the pole piece 2 conveyed by the pole piece conveying mechanism, the driving device 4 is used for driving the pole piece detection device 1 to move, and the boundary acquisition device 3 is used for acquiring the position information of the first boundary 21 and the position information of the second boundary 22 in the width direction of the pole piece 2. The control system is connected with the driving device 4 to be able to control the reciprocating movement of the pole piece detection device 1. The control system is connected with the boundary acquisition device 3 to acquire data of the boundary acquisition device 3. The control system is able to adjust the detection range of the pole piece detection device 1 in response to the data of the boundary acquisition device 3.
The boundary acquisition means 3 may take any feasible form, such as a reflective photoelectric sensor, an ultrasonic sensor, an image sensor, etc. The pole piece detection device 1 may employ any feasible device, such as an areal density scanning device, a thickness detection device, etc.
Further, in an embodiment, referring to fig. 1 to 3, the boundary collecting device 3 and the pole piece detecting device 1 share the driving device 4, so that the boundary collecting device 3 and the pole piece detecting device 1 move synchronously.
Further, referring to fig. 1 to 3, the driving device 4 drives the pole piece detection device 1 and the boundary acquisition device 3 to move simultaneously, the control system includes a driving control system 5 and a pole piece detection control system 6, the driving device 4 includes a position metering element 41, and the driving control system 5 is electrically connected to the position metering element 41 and to the boundary acquisition device 3, so that the driving control system 5 can read the signal of the position metering element 41 and receive the signal of the boundary acquisition device 3. The driving control system 5 is in signal connection with the pole piece detection control system 6 and is used for sending a position signal to the pole piece detection control system 6.
Specifically, in one embodiment, referring to fig. 1 to 3, the driving device 4 includes a base 42 and a driving mechanism disposed on the base 42. The pole piece detection device 1 comprises a support 11, a support base 12 and a pole piece detection mechanism 13 arranged on the support 11, and the boundary acquisition device 3 comprises a pole piece boundary detection mechanism 31 arranged on the pole piece detection mechanism 13. The pole piece detection control system 6 (not shown in the figure) is located at the control end and is respectively connected with the driving control system 5 (not shown in the figure), the pole piece detection mechanism 13 and the pole piece boundary detection mechanism 31 in a network. The drive control system 5 is positioned at the acquisition end and is electrically connected with the drive mechanism.
In one embodiment, referring to fig. 1 to 3, the driving mechanism includes a driving motor 43, a screw connecting seat 44, a screw 45, a screw mounting seat 46 and a guide rail 47. The position measuring element 41 is an encoder 410, and the encoder 410 is mounted on the driving motor 43 for acquiring the position of the driving motor 43. The screw rod connecting seat 44 is used for connecting the driving motor 43 and the screw rod 45. The screw rod mounting seat 46 is used for mounting the screw rod 45, and ensures the operation stability of the driving mechanism. The number of pulse signals generated after one rotation of the driving motor 43 provided with the encoder 410 can be calculated from the total number of pulse signals, and the position information of the pole piece detecting mechanism 13 can be calculated from the lead of the lead screw 45, that is, the distance of the linear advance of the lead screw 45 after one rotation of the driving motor 43. Similarly, the speed information of the pole piece detecting mechanism 13 can be calculated based on the number of pulse signals generated by the encoder 410 per unit time in combination with the lead of the lead screw 45. In some other embodiments, encoder 410 may be replaced with a magnetic grid scale and a read head or other displacement sensor.
In one embodiment, referring to fig. 2 and 3, the bracket 11 includes an upper bracket body 111 and a lower bracket body 112, one of the pole piece detecting mechanisms 13 is a first pole piece detecting mechanism 131, and the other of the pole piece detecting mechanisms 13 is a second pole piece detecting mechanism 132. Wherein, the first pole piece detecting mechanism 131 is installed on the upper bracket body 111, and the second pole piece detecting mechanism 132 is installed on the lower bracket body 112. The pole piece boundary detection mechanism 31 is mounted on the first pole piece detection mechanism 131, which is convenient for debugging. Of course, in some other embodiments, the pole piece boundary detecting mechanism 31 may be mounted on either one of the first pole piece detecting mechanism 131 and the second pole piece detecting mechanism 132.
The first pole piece detecting mechanism 131 and the second pole piece detecting mechanism 132 move simultaneously, and scan the pole piece 2 from the upper direction and the lower direction respectively to obtain information, wherein the obtained information comprises, but is not limited to, the thickness of the pole piece 2, data of a thinning coating area and the like, and different information can meet the acquisition requirement by selecting a proper sensor.
In one embodiment, referring to fig. 1 to 3, the depth of the detection range of the boundary acquisition device 3 can exceed the position of the pole piece 2, but does not reach the second pole piece detection mechanism 132. Before the detection of the present embodiment starts, if the detection range of the boundary collecting device 3 reaches the second pole piece detecting mechanism 132, the boundary collecting device 3 may misidentify the second pole piece detecting mechanism 132 as the pole piece 2, and the pole piece detecting device 1 needs to be adjusted to reduce the detection range thereof. If the detection range of the boundary acquisition device 3 does not reach the pole piece 2, the boundary acquisition device 3 can not detect the pole piece 2, and the pole piece detection device 1 needs to be manually adjusted to enlarge the detection range.
It will be appreciated that detection of the pole piece 2 by the boundary acquisition means 3 along the width of the pole piece 2 will move from the first boundary 21 to the second boundary 22 of the pole piece 2. In the process that the boundary collecting device 3 moves from the first boundary 21 to the second boundary 22, the boundary collecting device 3 sends out a first trigger signal when detecting the first boundary 21, and the information of the encoder 410 at this time is read to obtain the measured position information of the first boundary 21. Similarly, the boundary acquisition device 3 sends out a second trigger signal when detecting the second boundary 22, and the information of the encoder 410 can be read to obtain the measured position information of the second boundary 22. By controlling the boundary acquisition device 3 to reciprocate n times, after removing abnormal data, the accurate boundary position information of the pole piece 2 can be considered to be obtained by the obtained average value.
In an embodiment, referring to fig. 1 to 3, when the driving control system 5 controls the driving mechanism to operate, the driving motor 43 drives the screw rod 45 to rotate, so as to drive the support base 12 to move along the width direction of the pole piece 2, the first pole piece detecting mechanism 131 installed on the upper support body 111 and the second pole piece detecting mechanism 132 installed on the lower support body 112 synchronously move along the width direction of the pole piece 2, and the boundary collecting device 3 installed on the first pole piece detecting mechanism 131 also moves along the width direction of the pole piece 2.
In this embodiment, the pole piece detection control system 6 is connected to the pole piece detection mechanism 13, so as to obtain the detection information of the pole piece 2 in real time. Meanwhile, the pole piece detection control system 6 is connected with the drive control system 5 through a network, the drive control system 5 is electrically connected with the drive motor 43 and the encoder 410, and the pole piece detection control system 6 can acquire information such as the current running position, the current running speed, the current running direction and the like in real time. Through the connection with the boundary acquisition device 3, the pole piece detection control system 6 can acquire the position information from the encoder 410 according to the signal change of the boundary acquisition device 3, so that the real-time and high-precision boundary position of the pole piece 2 is calculated.
In this embodiment, when the pole piece detecting device 1 is operating normally, the pole piece 2 is running along the length direction, and the pole piece detecting mechanism 13 is running back and forth along the width direction of the pole piece 2.
In one embodiment, referring to fig. 1 to 3, when first running, the pole piece detecting mechanism 13 runs from a preset origin to a preset destination along the width direction of the pole piece 2, and then runs from the preset destination to the preset origin.
When the pole piece detection mechanism 13 moves to the boundary position of the pole piece 2, the signal of the boundary acquisition device 3 is changed from none, the pole piece detection control system 6 receives the signal change of the boundary acquisition device 3, acquires the pulse signal of the encoder 410, calculates the position and marks the position as the position of the first boundary 21;
when the pole piece detection mechanism 13 leaves the boundary position of the pole piece 2, the signal of the boundary acquisition device 3 is changed from the presence to the absence, the pole piece detection control system 6 receives the signal change of the boundary acquisition device 3, acquires the pulse signal of the encoder 410, calculates the position and marks the position as the position of the second boundary 22;
The pole piece detection control system 6 calculates the width of the pole piece 2 according to the position information of the first boundary 21 and the position information of the second boundary 22, and calculates the average value of the width of the pole piece 2 after a plurality of round trips. The origin and end positions of the pole piece detecting mechanism 13, that is, the first detection boundary and the second detection boundary of the detection area of the pole piece detecting device 1 are adjusted again according to the calculated average value of the pole piece 2 width.
In one embodiment, referring to fig. 5, the pole piece detection mechanism 13, the boundary acquisition device 3 and the driving control system 5 at the acquisition end are respectively connected to the pole piece detection control system 6 at the control end through a network, and the encoder 410 is electrically connected to the driving control system 5. Because the network connection has a certain delay, the delay of the electrical connection is very small and can be ignored. When the pole piece detection mechanism 13 moves back and forth at a low speed to detect the pole piece 2, the detection error of the boundary position of the pole piece 2 is lower due to the delay of network connection, and the detection error is within an allowable range. When the pole piece detection mechanism 13 carries out high-speed round trip operation to detect the pole piece 2, the detection error of the boundary position of the pole piece 2 caused by the delay of network connection can be increased along with the increase of the operation speed.
Referring to fig. 6, the step of obtaining the boundary position of the pole piece 2 includes:
S1: the boundary acquisition device 3 detects the boundary position of the pole piece 2 and sends out a signal;
s2: the pole piece detection control system 6 receives signals sent by the boundary acquisition device 3 through network connection;
S3: the pole piece detection control system 6 operates a program according to the signals and calls related instructions;
S4: the pole piece detection control system 6 sends an instruction to the drive control system 5;
s5: the drive control system 5 receives the instruction;
S6: the driving control system 5 obtains the boundary position information of the pole piece 2 by reading the signal of the encoder 410 and sends the information to the pole piece detection control system 6;
S7: and the pole piece detection control system 6 receives the position information and calculates the boundary position of the pole piece 2.
In the process of acquiring the boundary position of the pole piece 2, the boundary acquisition device 3 in S1 changes from not detecting the pole piece 2 to detecting the pole piece 2, the moment is marked as T0, the moment of sending out a signal is marked as T1, and the response delay of the boundary acquisition device 3 is marked as d 0. And S2, the moment when the pole piece detection control system 6 receives the signal through network connection is marked as T2, and the network delay is marked as d 1. The moment when the pole piece detection control system 6 sends out the instruction in the S4 is marked as T3, and the running program delay in the S3 and the S4 is marked as d 2. The moment when the drive control system 5 receives the instruction in S5 is marked as T4, and the network delay between the drive control system 5 and the pole piece detection control system 6 in S5 is marked as d3. The time when the drive control system 5 receives the signal from the encoder 410 in S6 is denoted as T5, and the response time of the encoder 410 and the delay time of the electrical connection between the drive control system 5 and the encoder 410 in S6 are denoted as d4. Because the S6 has already acquired the boundary position information of the pole piece 2, the network delay of the pole piece detection control system 6 and the drive control system 5 in step S7 does not affect the accuracy of the boundary position information of the pole piece 2.
The difference between the acquisition of the position information of the first border 21 and the position information of the second border 22 is only that the border acquisition means 3 is changed from detecting the pole piece 2 to not detecting the pole piece 2, and is identical in the following.
After receiving the position information of the plurality of first boundaries 21 and the position information of the second boundaries 22, the pole piece detection control system 6 calculates the average value of the position information of the first boundaries 21 and the average value of the position information of the second boundaries 22 after excluding the obviously wrong values, and changes the origin and end positions of the pole piece detection mechanism 13.
In this embodiment, the response time d0 of the boundary acquisition device 3 in S1 is within 1ms, which is negligible. The response time of the encoder 410 and the delay d4 of the electrical connection to the drive control system 5 in S6 are much smaller than 1ms and can be neglected. The running program delays d2, S4 and S5 of the pole piece detection control system 6 in the network connection delays d1, S3 and S4 of the pole piece detection control system 6 in the S2 and the boundary acquisition device 3 and the network connection delay d3 of the pole piece detection control system 6 in the S6 and the driving control system 5 are main factors influencing the boundary detection error of the pole piece 2.
The signal change of the boundary acquisition device 3 in S1 does not mean a signal abnormality, but means a change from no detection of the pole piece 2 to detection of the pole piece 2 or a change from detection of the pole piece 2 to no detection of the pole piece 2. The positions of the two signal changes are the boundary positions of the pole piece 2, that is, the boundary acquisition device 3 performs trigger detection by the presence or absence of an object to be detected.
In one embodiment, referring to fig. 7, in order to further improve the detection accuracy of the boundary position of the pole piece 2, the encoder 410 is directly electrically connected to the drive control system 5. The driving control system 5 at the acquisition end can directly acquire the boundary position of the pole piece 2 through the electric connection with the encoder 410 and the boundary acquisition device 3, and then send the boundary position of the pole piece 2 to the pole piece detection control system 6 through the network connection with the pole piece detection control system 6.
Referring to fig. 7, in the modification of the present embodiment, the pole piece detecting device 1, the encoder 410, and the driving control system 5 are all located at the collecting end, and the detection of the boundary position of the pole piece 2 is no longer affected by the delay of the network connection. The drive control system 5 reads the signal of the boundary acquisition device 3 to acquire the encoder 410 position information.
It will be appreciated that the accuracy error of the edge detection of pole piece 2 is mainly due to the delay of network transmission and the processing time of the pole piece detection system.
Referring to fig. 8, the step of obtaining the boundary position of the pole piece 2 includes:
s10: the boundary acquisition device 3 detects the boundary position of the pole piece 2 and sends out a signal;
S20: the driving control system 5 receives signals sent by the boundary acquisition device 3 through electric connection;
S30: the driving control system 5 obtains position information by reading the signal of the encoder 410, calculates the boundary position of the pole piece 2, and sends the boundary position to the pole piece detection control system 6;
S40: the pole piece detection control system 6 receives the boundary position of the pole piece 2.
In the modification of the present embodiment, the response time of the boundary acquisition device 3 in S10 is within 1ms, which is negligible. The electrical connection of the drive control system 5 to the boundary acquisition means 3 in S20 has little delay and is negligible. The response time of the encoder 410 in S30 is less than 1ms and can be ignored. Since the drive control system 5 has acquired accurate encoder 410 position information in S30, S40 only sends the result to the pole piece detection device 1, so the network delay of the pole piece detection control system 6 and the drive control system 5 in S40 does not affect the detection error of the boundary position of the pole piece 2.
In a modification of this embodiment, the detection error of the boundary position of the pole piece 2 depends only on the response time of the boundary acquisition device 3 and the encoder 410 itself. The response time of the current boundary acquisition device 3 and the encoder 410 is less than 1ms, the detection precision of the boundary position of the pole piece 2 is extremely high and is hardly influenced by the movement speed of the pole piece detection mechanism 13.
In some other embodiments, in the structure of the pole piece detection system, the pole piece detection device can be driven by a linear motor, a gear rack mechanism, a cylinder and other mechanisms besides the above screw nut mechanism for driving the pole piece detection mechanism to move. In some other embodiments, the driving device may separately drive the pole piece detecting device, and the driving device is further configured to drive the boundary collecting device, where a set of driving mechanism is required to be further configured for the boundary collecting device.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (13)
1. The pole piece detection method is characterized in that a pole piece detection device is used for carrying out online detection on a pole piece, and the position information of a first boundary and the position information of a second boundary in the width direction of the pole piece are obtained; and adjusting the detection range of the pole piece detection device according to the position information of the first boundary and the position information of the second boundary.
2. The pole piece inspection method of claim 1, wherein said adjusting the inspection range of the pole piece inspection device comprises:
The method comprises the steps that position information of a first boundary and position information of a second boundary are acquired for multiple times through a boundary acquisition device, and the detection range of a pole piece detection device is adjusted according to the position information of the first boundary and the position information of the second boundary acquired for multiple times by the boundary acquisition device; the detection range is the scanning range of the pole piece detection device in the width direction of the pole piece.
3. The pole piece detection method of claim 2, wherein the boundary acquisition device moves synchronously with the pole piece detection device, and the pole piece detection device performs on-line detection on the pole piece while the boundary acquisition device acquires the position information of the first boundary and the position information of the second boundary.
4. A pole piece detection method according to claim 1,2 or 3, wherein the two boundaries of the detection area of the pole piece detection device in the pole piece width direction are a first detection boundary and a second detection boundary, respectively, the first detection boundary, the first boundary, the second boundary and the second detection boundary being arranged in this order, the first detection boundary being on a side of the first boundary away from the second boundary, and the second detection boundary being on a side of the second boundary away from the first boundary.
5. The pole piece inspection method of claim 4, wherein the pole piece inspection device inspects the area between the first boundary and the second boundary at a constant speed, and the pole piece inspection device detects the area between the first boundary and the first inspection boundary at an acceleration or a deceleration, and detects the area between the second boundary and the second inspection boundary at an acceleration or a deceleration.
6. The pole piece detecting method according to claim 1, wherein boundaries between two thinned coating regions and non-thinned coating regions on the pole piece are a first thinned coating boundary and a second thinned coating boundary, respectively, the first boundary, the first thinned coating boundary, the second thinned coating boundary, and the second boundary being arranged in order in the pole piece width direction, the pole piece detecting device detects a region between the first boundary and the first thinned coating boundary at an average speed V1, and a region between the second boundary and the second thinned coating boundary at an average speed V2, and detects a region between the first thinned coating boundary and the second thinned coating boundary at an average speed V3, V3 > V1, and V3 > V2.
7. The pole piece inspection method of claim 6, wherein the pole piece inspection device senses the area between the first thinned coating boundary and the second thinned coating boundary at a uniform speed.
8. A pole piece inspection method as claimed in claim 6, wherein the pole piece inspection device performs acceleration or deceleration or uniform speed inspection of the area between the first boundary and the first thinned coating boundary and performs acceleration or deceleration or uniform speed inspection of the area between the second boundary and the second thinned coating boundary.
9. The pole piece detecting method according to claim 1, wherein boundaries between two thinned coating regions and non-thinned coating regions on the pole piece are a first thinned coating boundary and a second thinned coating boundary, respectively, the first boundary, the first thinned coating boundary, the second thinned coating boundary, and the second boundary being arranged in order in the pole piece width direction, the pole piece detecting device detects a region between the first boundary and the second boundary at a constant speed, a sampling frequency of the pole piece detecting device for a region between the first boundary and the first thinned coating boundary is A1, a sampling frequency for a region between the second boundary and the second thinned coating boundary is A2, and a sampling frequency for a region between the first thinned coating boundary and the second thinned coating boundary is A3, A1 > A3, and A2 > A3.
10. A pole piece detection method according to any of claims 6-9, characterized in that the position information of the first thinning coating boundary is set according to the position information of the first boundary and the position information of the second boundary, and the position information of the second thinning coating boundary is set.
11. A pole piece detection system for implementing the pole piece detection method of any one of claims 1-10, comprising:
The pole piece detection device is used for detecting the pole piece conveyed by the pole piece conveying mechanism on line;
the driving device is used for driving the pole piece detection device to move;
the boundary acquisition device is used for acquiring the position information of the first boundary and the position information of the second boundary in the width direction of the pole piece;
the control system is connected with the driving device to control the reciprocating motion of the pole piece detection device; the control system is connected with the boundary acquisition device to acquire data of the boundary acquisition device; the control system can respond to the data of the boundary acquisition device to adjust the detection range of the pole piece detection device.
12. The pole piece detection system of claim 11, wherein the boundary acquisition device shares the drive device with the pole piece detection device to synchronize movement of the boundary acquisition device with the pole piece detection device.
13. The pole piece inspection system of claim 12, wherein the drive means simultaneously drives the pole piece inspection device and the boundary acquisition device in motion, the control system comprising a drive control system and a pole piece inspection control system, the drive control system comprising a position metering element, the drive control system being electrically connected to the position metering element and to the boundary acquisition device to enable the drive control system to read signals from the position metering element and to receive signals from the boundary acquisition device; the driving control system is in signal connection with the pole piece detection control system and is used for sending a position signal to the pole piece detection control system.
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