CN109786853B - Automatic correction method for boundary displacement of lithium battery winding layer - Google Patents
Automatic correction method for boundary displacement of lithium battery winding layer Download PDFInfo
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Abstract
The invention belongs to the technical field of batteries, and particularly relates to an automatic correction method for boundary displacement of a lithium battery winding layer, which comprises the following steps: 1) setting a standard value of a winding layer according to the model of the battery; 2) in the process of winding the battery cell, a camera acquires images of each winding layer; 3) and analyzing the position parameters of each winding layer according to the images of the winding layers, then judging whether the winding layers are displaced or not according to the analysis result, and if so, adjusting the winding layers of the next battery cell. The invention can detect the winding layer in the winding process of the battery cell and correct the boundaries of each isolating film and electrode layer of the next battery cell, thereby facilitating the simplification of the working procedure, improving the production efficiency and improving the quality of the battery cell.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to an automatic correction method for boundary displacement of a lithium battery winding layer.
Background
Nowadays, as a novel secondary battery, the lithium ion battery has the advantages of high energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospects in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like. Because the ideal state is that the boundary of each layer of the winding layer of the lithium battery does not shift and change relative to the initial position of the winding layer in the winding process, under the normal condition, the displacement of each layer of the winding layer of the lithium battery relative to the initial position of each layer is very small and is not easy to be perceived under the condition of naked eyes, the displacement change condition of the winding layer of the lithium battery relative to the initial position or the preset position in the winding process cannot be judged, and the quality of the winding effect cannot be judged.
Among them, chinese patent document discloses a detection apparatus and a detection method for a lithium battery winding layer boundary (publication No. CN 108180826 a), including: the winding layer at least comprises a first diaphragm layer, a first electrode layer, a second diaphragm layer and a second electrode layer which are stacked; the detection device includes: the first illumination light is arranged on one side of the winding layer, and the irradiation area of the first illumination light is larger than or equal to the boundary area of the winding layer; the camera device is arranged on one side, back to the first illumination light, of the winding layer and used for collecting images of the boundary of the first diaphragm layer and the boundary of the second diaphragm layer on the same side; the detection device is used for detecting whether the boundary of the first diaphragm layer and the same-side boundary of the second diaphragm layer in the acquired image coincide or not so as to judge whether the boundary of the first diaphragm layer is aligned with the same-side boundary of the second diaphragm layer or not. The above solution can detect the alignment of the boundary to some extent, but it has at least the following disadvantages: firstly, the detection method is complex and has high cost; second, only the winding layer of the battery can be monitored, and the winding layer cannot be corrected.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the automatic correction method for the boundary displacement of the lithium battery winding layer is provided, the winding layer can be detected in the winding process of the battery cell, the boundaries of each isolation film and electrode layer of the next battery cell can be corrected, the process is simplified, the production efficiency is improved, and the quality of the battery cell can be improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic correction method for boundary displacement of a lithium battery winding layer comprises the following steps:
1) setting a standard value of a winding layer according to the model of the battery;
2) in the process of winding the battery cell, a camera acquires images of each winding layer;
3) and analyzing the position parameters of each winding layer according to the images of the winding layers, then judging whether the winding layers are displaced or not according to the analysis result, and if so, adjusting the winding layers of the next battery cell.
It should also be noted that: in the correction method, in the step 1), because the types of the batteries are more, and the requirements of different types of batteries on the winding layer are different, the corresponding standard value is changed, and a user needs to set the standard value according to the actual size of the battery and the circuit design; in the step 2), the camera collects the image of each winding layer, the boundary of each diaphragm layer and each electrode layer is displayed in the image, and the high-definition image can be further amplified, so that whether the winding layer is displaced or not can be conveniently judged from the collected image, the problem that whether the winding layer is displaced or not cannot be accurately detected by naked eyes can be solved, the quality of the lithium battery is favorably ensured, meanwhile, the position of the boundary of each diaphragm layer and each electrode layer is recorded by adopting a photographing mode, the detection precision is improved, and the real-time monitoring or the rechecking of a user is facilitated; in the step 3), the position parameters of the boundary of the diaphragm layer and the electrode layer need to be extracted from the acquired images of each layer of the winding layer, and meanwhile, in order to reduce errors, multiple sets of position parameters are measured for multiple times, so that the detection errors can be reduced, the trend of displacement of each layer of the winding layer can be summarized through effective analysis, the displacement of the winding layer can be found in advance, corresponding position adjustment can be automatically carried out, the production process is simplified, and the production efficiency is improved.
As an improvement of the method for automatically correcting the boundary displacement of the lithium battery winding layer, in step 3), the method for analyzing the position parameter includes the following steps:
a1, respectively calculating the average value, the standard value, the maximum value, the minimum value and the standard deviation of the position parameters;
and A2, summarizing the position parameters and drawing an SPC control chart.
In the above analysis method, in step a1, the average value is calculated to determine the overall position of the wound layer; the maximum value and the minimum value are calculated, whether the winding layer is in a standard value or not can be rapidly identified, and meanwhile, a user can know the displacement tendency of the winding layer in time by calculating the standard deviation; in step a2, the SPC control chart is a scientifically designed chart for measuring and recording the quality of the process, and performing control management, and includes three lines: when the position parameter exceeds the upper control limit or the lower control limit, a user can directly know the displacement condition of the winding layer from the SPC control chart to make corresponding position adjustment, such as moving an isolation film or a pole piece, so that the position parameter before moving and the position parameter after moving can be conveniently compared to control the quality of the battery.
As an improvement of the method for automatically correcting the boundary displacement of the lithium battery winding layer, in step 3), the method for judging the displacement of the winding layer includes:
if the average value exceeds the standard value, the winding layer is displaced;
if the maximum value or the minimum value exceeds the standard value, the winding layer is displaced;
and if the standard deviation is larger than 0.08, the winding layer is displaced.
As an improvement of the method for automatically correcting the boundary displacement of the lithium battery winding layer, in step 3), the method for adjusting the winding layer includes the following steps:
b1, removing the displaced battery cell;
and B2, readjusting the position of the winding layer of the next battery cell according to the SPC control chart until the position parameter of each winding layer falls within the standard value.
In the adjusting method, in the step B1, the displaced battery cell is removed from the winding machine, which is beneficial to recycling the battery cell, and meanwhile, cost increase and yield reduction caused by continuous production of the battery cell are prevented; in the step B2, the boundary positions of the diaphragm layer and the electrode layer of the next cell are adjusted by automatically judging whether the position parameters of each winding layer fall within the standard values, so that the method is not only beneficial to finding out the reason of displacement, but also can prevent the next cell from displacing on the same winding layer, and the yield of the cells is fundamentally improved.
As an improvement of the method for automatically correcting the boundary displacement of the lithium battery winding layer, in the step 2), the camera is a CCD digital photoelectric sensor or a CMOS digital photoelectric sensor.
As an improvement of the method for automatically correcting the boundary displacement of the lithium battery winding layer, step 2) further includes performing startup calibration on a camera.
As an improvement of the method for automatically correcting the boundary displacement of the lithium battery winding layer, in step 1), the winding layer includes a positive plate, a separation film and a negative plate which are stacked.
As an improvement of the method for automatically correcting the boundary displacement of the lithium battery winding layer, in step 3), the position parameters include a distance that the edge of the separator exceeds the negative plate in the width direction, and a distance that the edge of the negative plate exceeds the positive plate in the width direction.
As an improvement of the method for automatically correcting the boundary displacement of the winding layer of the lithium battery, in step a2, the SPC control chart is used for comprehensively analyzing the abnormal fluctuation of the winding layer and giving an alarm about the abnormal trend.
The beneficial effect of the invention is that the invention comprises the following steps: 1) setting a standard value of a winding layer according to the model of the battery; 2) in the process of winding the battery cell, a camera acquires images of each winding layer; 3) and analyzing the position parameters of each winding layer according to the images of the winding layers, then judging whether the winding layers are displaced or not according to the analysis result, and if so, adjusting the winding layers of the next battery cell. In the correction method, in the step 1), because the types of the batteries are more, and the requirements of different types of batteries on the winding layer are different, the corresponding standard value is changed, and a user needs to set the standard value according to the actual size of the battery and the circuit design; in the step 2), the camera collects the image of each winding layer, the boundary of each diaphragm layer and each electrode layer is displayed in the image, and the high-definition image can be further amplified, so that whether the winding layer is displaced or not can be conveniently judged from the collected image, the problem that whether the winding layer is displaced or not cannot be accurately detected by naked eyes can be solved, the quality of the lithium battery is favorably ensured, meanwhile, the position of the boundary of each diaphragm layer and each electrode layer is recorded by adopting a photographing mode, the detection precision is improved, and the real-time monitoring or the rechecking of a user is facilitated; in the step 3), the position parameters of the boundary of the diaphragm layer and the electrode layer need to be extracted from the acquired images of each layer of the winding layer, and meanwhile, in order to reduce errors, multiple sets of position parameters are measured for multiple times, so that the detection errors can be reduced, the trend of displacement of each layer of the winding layer can be summarized through effective analysis, the displacement of the winding layer can be found in advance, corresponding position adjustment can be automatically carried out, the production process is simplified, and the production efficiency is improved. The invention can detect the winding layer in the winding process of the battery cell and correct the boundaries of each isolating film and electrode layer of the next battery cell, thereby facilitating the simplification of the working procedure, improving the production efficiency and improving the quality of the battery cell.
Drawings
FIG. 1 is a flow chart of example 1 of the present invention.
FIG. 2 is a flow chart of example 2 of the present invention.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1-2, an automatic correction method for boundary displacement of a lithium battery winding layer includes the following steps:
1) setting a standard value of a winding layer according to the model of the battery;
2) in the process of winding the battery cell, a camera acquires an image of each winding layer;
3) and analyzing the position parameters of each winding layer according to the images of the winding layers, judging whether the winding layers are displaced or not according to the analysis result, and if so, adjusting the winding layer of the next cell.
It should also be noted that: in the correction method, in the step 1), because the types of the batteries are more, and the requirements of different types of batteries on the winding layer are different, the corresponding standard value is changed, and a user needs to set the standard value according to the actual size of the battery and the circuit design; in the step 2), the camera collects the image of each winding layer, the boundary of each diaphragm layer and each electrode layer is displayed in the image, and the high-definition image can be further amplified, so that whether the winding layer is displaced or not can be conveniently judged from the collected image, the problem that whether the winding layer is displaced or not cannot be accurately detected by naked eyes can be solved, the quality of the lithium battery is favorably ensured, meanwhile, the position of the boundary of each diaphragm layer and each electrode layer is recorded by adopting a photographing mode, the detection precision is improved, and the real-time monitoring or the rechecking of a user is facilitated; in the step 3), the position parameters of the boundary of the diaphragm layer and the electrode layer need to be extracted from the acquired images of each layer of the winding layer, and meanwhile, in order to reduce errors, multiple sets of position parameters are measured for multiple times, so that the detection errors can be reduced, the trend of displacement of each layer of the winding layer can be summarized through effective analysis, the displacement of the winding layer can be found in advance, corresponding position adjustment can be automatically carried out, the production process is simplified, and the production efficiency is improved.
Preferably, in step 3), the method for analyzing the position parameter includes the following steps:
a1, respectively calculating the average value, the standard value, the maximum value, the minimum value and the standard deviation of the position parameters;
and A2, summarizing the position parameters and drawing an SPC control chart.
In the above analysis method, in step a1, the average value is calculated to determine the overall position of the wound layer; the maximum value and the minimum value are calculated, whether the winding layer is in a standard value or not can be rapidly identified, and meanwhile, a user can know the displacement tendency of the winding layer in time by calculating the standard deviation; in step a2, the SPC control chart is a scientifically designed chart for measuring and recording the quality of the process, and performing control management, and includes three lines: when the position parameter exceeds the upper control limit or the lower control limit, a user can directly know the displacement condition of the winding layer from the SPC control chart to make corresponding position adjustment, such as moving an isolation film or a pole piece, so that the position parameter before moving and the position parameter after moving can be conveniently compared to control the quality of the battery.
Preferably, in step 3), the method for determining displacement of the winding layer includes:
if the average value exceeds the standard value, the winding layer is displaced;
if the maximum value or the minimum value exceeds the standard value, the winding layer is displaced;
if the standard deviation is greater than 0.08, the wound layers are displaced.
Preferably, in step 3), the method for adjusting the winding layer comprises the following steps:
b1, removing the displaced battery cell;
and B2, readjusting the position of the winding layer of the next battery cell according to the SPC control chart until the position parameter of each winding layer falls within the standard value.
In the adjusting method, in the step B1, the displaced battery cell is removed from the winding machine, which is beneficial to recycling the battery cell, and meanwhile, cost increase and yield reduction caused by continuous production of the battery cell are prevented; in the step B2, the boundary positions of the diaphragm layer and the electrode layer of the next cell are adjusted by automatically judging whether the position parameters of each winding layer fall within the standard values, so that the method is not only beneficial to finding out the reason of displacement, but also can prevent the next cell from displacing on the same winding layer, and the yield of the cells is fundamentally improved.
Preferably, in step 2), the camera is a CCD digital photosensor or a CMOS digital photosensor. CCD and CMOS sensors are two types of image sensors currently in common use, both of which convert images into digital data by photoelectric conversion using photodiodes, and the main difference is the manner of transferring digital data. The charge data of each pixel in each row in the CCD sensor is sequentially transmitted to the next pixel, is output from the bottommost part and is amplified and output by an amplifier at the edge of the sensor; in the CMOS sensor, each pixel is adjacent to an amplifier and an A/D conversion circuit, data are output in a memory circuit mode, and both the data and the data meet the requirement of information acquisition of a pole piece to be detected; the camera model of the CCD digital photoelectric sensor is Basler acA2440-20gc, which is beneficial to improving the shooting quality and better displaying the boundary of the diaphragm layer and the electrode layer.
Preferably, step 2) further includes performing power-on calibration on the camera. The method has the advantages that the starting calibration is carried out, the speed of extracting the position parameters of the images of the winding layer can be increased, meanwhile, the error of adjusting the position of the winding layer is reduced, the detected boundaries of the diaphragm layer and the electrode layer are also accurate when different cameras are used for shooting, and the position of the camera is ensured to meet the requirements of acquiring the images.
Preferably, in step 1), the winding layer includes a positive electrode sheet, a separator, and a negative electrode sheet, which are stacked.
Preferably, in step a2, SPC control charts are used to collectively analyze the abnormal fluctuation of the wound layers and to alarm for abnormal trends. The SPC control chart can prompt alarm information, help to find the reason, revise the winding layer again.
Example 2
The difference from example 1 is: the battery model number of the embodiment is 425970, and in the step 3), the position parameters comprise the distance of the edge of the separator exceeding the negative plate in the width direction and the distance of the edge of the negative plate exceeding the positive plate in the width direction. Setting the distance of the edge of the isolation film exceeding the negative plate in the width direction to be 1mm and the distance of the edge of the negative plate exceeding the positive plate in the width direction to be 0.75mm according to the process requirements;
collecting a group of distance of the edge of the isolation film exceeding the negative plate in the width direction for analysis, such as
1.02 1.02 1.01 1.01 1.00
1.01 0.99 1.01 1.03 1.02
The average value is calculated to be 1.01, the standard parameter is 1mm, and the camera proportionality coefficient is set to be 0.5. According to the compensation value = (average value-standard value) × proportionality coefficient =0.005mm, namely the edge of the isolation film is close to the positive plate by 0.05mm in the width direction, the requirement can be met.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (5)
1. An automatic correction method for boundary displacement of a lithium battery winding layer is characterized by comprising the following steps:
1) setting a standard value of a winding layer according to the model of the battery, wherein the winding layer comprises a positive plate, a separation film and a negative plate which are arranged in a laminated manner;
2) in the process of winding the battery cell, a camera acquires an image of each winding layer, and the boundaries of each diaphragm layer and each electrode layer are displayed in the image;
3) analyzing the position parameters of each winding layer according to the images of the winding layers, wherein the position parameters comprise the distance that the edge of the isolating film exceeds the negative plate in the width direction and the distance that the edge of the negative plate exceeds the positive plate in the width direction, judging whether the winding layers are displaced according to the analysis result, if the winding layers are displaced, summarizing the displacement trend of each winding layer, and adjusting the winding layers of the next battery cell;
in step 3), the method for analyzing the position parameter includes:
a1, respectively calculating the average value, the standard value, the maximum value, the minimum value and the standard deviation of the position parameters;
a2, summarizing the position parameters and drawing an SPC control chart;
in step 3), the method for judging the displacement of the winding layer comprises the following steps:
if the average value exceeds the standard value, the winding layer is displaced;
if the maximum value or the minimum value exceeds the standard value, the winding layer is displaced;
and if the standard deviation is larger than 0.08, the winding layer is displaced.
2. The method for automatically correcting the boundary displacement of the lithium battery winding layer according to claim 1, wherein the method comprises the following steps: in step 3), the method for adjusting the winding layer comprises the following steps:
b1, removing the displaced battery cell;
and B2, readjusting the position of the winding layer of the next battery cell according to the SPC control chart until the position parameter of each winding layer falls within the standard value.
3. The method for automatically correcting the boundary displacement of the lithium battery winding layer according to claim 1, wherein the method comprises the following steps: in the step 2), the camera is a CCD digital photoelectric sensor and a CMOS digital photoelectric sensor.
4. The method for automatically correcting the boundary displacement of the lithium battery winding layer according to claim 1, wherein the method comprises the following steps: and step 2), the method also comprises the step of carrying out startup calibration on the camera.
5. The method for automatically correcting the boundary displacement of the lithium battery winding layer according to claim 1, wherein the method comprises the following steps: in step a2, the SPC control chart is used to comprehensively analyze the abnormal fluctuation of the winding layer and to alarm for abnormal trends.
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| CN111369509B (en) * | 2020-02-27 | 2021-05-07 | 广东利元亨智能装备股份有限公司 | Product detection compensation method and device, product monitoring system and storage medium |
| CN111416142B (en) * | 2020-03-31 | 2021-03-30 | 广东利元亨智能装备股份有限公司 | Correction method and device for battery cell, correction control equipment and correction system |
| CN112053326B (en) * | 2020-08-13 | 2023-12-08 | 无锡先导智能装备股份有限公司 | Method, system, device and equipment for detecting alignment degree of battery cells |
| CN112229846B (en) * | 2020-10-14 | 2023-05-16 | 重庆冠宇电池有限公司 | Pole piece winding coverage detection method and equipment |
| EP4167341A4 (en) | 2021-08-31 | 2024-01-17 | Contemporary Amperex Technology Co., Limited | Battery winding method, battery winding system, battery, and electrical device |
| CN116670885A (en) * | 2021-09-01 | 2023-08-29 | 宁德时代新能源科技股份有限公司 | Coiled electrode assembly measuring method and device |
| JP7407339B2 (en) * | 2021-09-28 | 2023-12-28 | 寧徳時代新能源科技股▲分▼有限公司 | Misalignment detection method and misalignment detection device |
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