WO2023050065A1 - 偏移检测方法及偏移检测装置 - Google Patents

偏移检测方法及偏移检测装置 Download PDF

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Publication number
WO2023050065A1
WO2023050065A1 PCT/CN2021/121342 CN2021121342W WO2023050065A1 WO 2023050065 A1 WO2023050065 A1 WO 2023050065A1 CN 2021121342 W CN2021121342 W CN 2021121342W WO 2023050065 A1 WO2023050065 A1 WO 2023050065A1
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WIPO (PCT)
Prior art keywords
image
pole piece
electrode assembly
distance
images
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Ceased
Application number
PCT/CN2021/121342
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English (en)
French (fr)
Inventor
陈继伟
王绪明
张园园
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to JP2023545879A priority Critical patent/JP7656053B2/ja
Priority to PCT/CN2021/121342 priority patent/WO2023050065A1/zh
Priority to CN202180068327.0A priority patent/CN116349035B/zh
Priority to EP21958664.1A priority patent/EP4261965B1/en
Priority to KR1020237025503A priority patent/KR102874979B1/ko
Priority to HUE21958664A priority patent/HUE072421T2/hu
Priority to ES21958664T priority patent/ES3036757T3/es
Publication of WO2023050065A1 publication Critical patent/WO2023050065A1/zh
Priority to US18/484,455 priority patent/US12614749B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection
    • G06T7/0004—Industrial image inspection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H01M10/0409—Machines for assembling batteries for cells with wound electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30108—Industrial image inspection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the field of battery manufacturing, and in particular to an offset detection method and an offset detection device, which are used to detect the position offset of the electrode assembly when the electrode assembly is manufactured by winding.
  • the electrode assembly as a part of the battery cell where the electrochemical reaction occurs, is generally formed by winding or stacking a first pole piece, a second pole piece and a separator.
  • first pole piece, the second pole piece and the diaphragm are prone to deflection, which makes the first pole piece, the second pole piece and the diaphragm deviate from their normal positions.
  • the quality of the electrode assembly winding directly affects the performance of the battery cell. Therefore, how to accurately detect the offset of the electrode assembly is very important for battery manufacturing.
  • the present invention provides an offset detection method and an offset detection device, which can accurately detect the position offset when the electrode assembly is wound.
  • an offset detection method wherein it is used to detect the position offset of the electrode assembly during winding, the electrode assembly includes a first pole piece and a second pole piece, and the offset detection method includes : an image acquisition step, during the winding process of the electrode assembly, a plurality of first images and a plurality of second images are acquired by a photographing unit, the first images include the first pole piece, the second The image includes the second pole piece; the image matching step is to match a first image with a second image, the first image and the second image contain the same or corresponding identification objects, and the identification The object is a part periodically formed on each winding layer of the electrode assembly; the offset determination step, in a set of matched first images and second images, according to the first pole piece in the first image and/or the boundary of the second pole piece in the second image, and determine whether the electrode assembly is shifted.
  • the first pole piece on the first image and the second pole piece on the second image acquired at the same time May not have a mutual correspondence. That is, the second pole piece on the second image acquired at the same time may enter the electrode assembly winding device earlier than the first pole piece on the first image.
  • the technical solution of the embodiment of the present application ensures that the first pole piece and the second pole piece in a set of matching first images and second images correspond to each other by matching the first image and the second image, that is, a set of matching The first pole piece and the second pole piece in the first image and the second image are in the same winding layer in the wound electrode assembly. Thereby, positional displacement at the time of winding of the electrode assembly can be determined more accurately.
  • a comparison area is set according to the identified object, according to the boundary of the first pole piece in the comparison area of the first image and/or all the parameters of the second image
  • the boundary of the second pole piece in the comparison area is used to determine whether the electrode assembly is offset.
  • the first image is an image of the electrode assembly before being wound by a needle
  • the second image is an image of the electrode assembly after being wound by a needle.
  • the pole piece is prone to shift.
  • the state of the pole piece before winding and the state after winding can be obtained respectively through the first image and the second image, so as to determine whether the position of the electrode assembly is shifted during the winding process.
  • the first image and the second image are acquired when the needle rotates at a preset angle.
  • the preset angle it can be ensured that each output first image and second image contains only one identification object, thereby ensuring that the identification object can be used to determine the comparison area in the first image and the second image.
  • offset determination can be performed in real time.
  • the photographing unit includes a first camera and a second camera, the first camera photographs the first image, the second camera photographs the second image, the first camera and the The second camera respectively photographs two opposite surfaces of the electrode assembly. Since the electrode assembly 100 is prone to deflection during the process of being wound on the needle. By comparing the first image T1 and the second image T2 of the two opposite surfaces of the electrode assembly 100 , it can be determined whether the first pole piece 1 and the second pole piece 2 are shifted during the process of being wound on the needle.
  • the (n+1)th second image acquired in the image acquiring step is matched with the nth first image. Affected by the winding speed of the electrode assembly winding equipment and the position of the shooting unit, etc., the electrode assembly in the second image acquired at the same time is earlier than the first electrode assembly in the first image, and the first image of the second image T2 No object is identified.
  • the identification object is a tab of the first pole piece and/or a tab of the second pole piece in the same winding layer. Since the tabs of the first pole piece and/or the tabs of the second pole piece are periodically formed on the parts of each winding layer of the electrode assembly, there is no need to additionally set markers on the electrode assembly, only through the pole tabs of the first pole piece If the lug and/or the lug of the second pole piece is used, a comparison area can be determined in the first image and the second image.
  • a first distance is obtained in said first image and a first distance is obtained in said second image.
  • the first distance is the distance from the first reference point to the boundary of the first pole piece
  • the second distance is the distance from the second reference point to the boundary of the second pole piece, when the difference obtained by subtracting the preset distance between the boundary of the first pole piece and the boundary of the second pole piece from the difference between the first distance and the second distance is greater than a first threshold, it is determined that the electrode assembly Offset occurs.
  • the relative positional relationship between the first pole piece and the second pole piece can be determined, so as to determine whether the position of the electrode assembly is displaced during winding.
  • a first distance is obtained in said first image and a first distance is obtained in said second image.
  • the first distance is the distance from the first reference point to the boundary of the first pole piece
  • the second distance is the distance from the second reference point to the boundary of the second pole piece, by comparing the The first distance and the first distance preset value are used to determine whether the first pole piece of the electrode assembly is offset
  • the second distance of the electrode assembly is determined by comparing the second distance with the second distance preset value. Whether the pole piece is offset.
  • an offset detection device is provided, wherein it is used to detect the position offset of an electrode assembly when winding, the electrode assembly includes a first pole piece and a second pole piece, and the offset detection device includes: an image acquisition unit, during the winding process of the electrode assembly, acquire a plurality of first images and a plurality of second images, the first images include the first pole piece, and the second images include the The second pole piece, an image matching unit, matches a first image with a second image, the first image and the second image contain the same or corresponding identification objects, and the identification objects are periodic The part formed on each winding layer of the electrode assembly, the offset determination unit, for a set of matched first images and second images, according to the boundary of the first pole piece in the first image and/or the second The boundary of the second pole piece in the second image is used to determine whether the electrode assembly is offset.
  • FIG. 1 is a schematic diagram of an electrode assembly manufacturing equipment including an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a wound electrode assembly according to an embodiment of the present application.
  • FIG 3 is a cross-sectional view including an X-Y cross-section of a wound electrode assembly according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of an expanded electrode assembly according to an embodiment of the present application.
  • FIG. 5 is a flowchart of an offset detection method according to an embodiment of the present application.
  • Fig. 6 is a schematic diagram of a group of matched first images and second images according to an embodiment of the present application.
  • connection In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms “installation”, “connection”, “connection” and “attachment” should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
  • Multiple appearing in this application refers to more than two (including two), similarly, “multiple groups” refers to more than two groups (including two groups), and “multi-piece” refers to more than two (Includes two pieces).
  • FIG. 1 is a schematic diagram of an electrode assembly manufacturing equipment including an embodiment of the present application.
  • FIG. 2 illustrates the electrode assembly 100 formed by winding.
  • the electrode assembly manufacturing device includes a conveying device and a winding device (needle 5 ).
  • the belt-shaped first pole piece 1, second pole piece 2 and diaphragm 3 are transported to the winding device (rolling needle 5) by the conveying device, and the first pole piece 1, the diaphragm 3, the second pole piece 2 and the diaphragm 3
  • the electrode assembly 100 (refer to FIG. 2 ) is formed by stacking and winding on a winding device (needle 5 ) in sequence.
  • the winding pin 5 in Fig. 1 is only for illustration. According to the type of the battery cell and the shape of the battery case, the electrode assembly can be wound into a cylindrical electrode assembly or an oval electrode assembly (as shown in Fig. 2, Fig. 3).
  • FIG. 3 is a cross-sectional view of the electrode assembly 100 shown in FIG. 2 on the X-Y plane.
  • the diaphragm 3 separates the second pole piece 2 from the first pole piece 1 .
  • FIG. 4 is a development view along the Y direction of the stacked and wound electrode assembly 100 . As shown in the figure, in the Z-axis direction (ie, the width direction of the unfolded electrode assembly 100 ), from outside to inside, there should be: the separator 3 , the second pole piece 2 , another membrane 3 and the first pole piece 1 .
  • the electrode assembly manufacturing device further includes a photographing unit 4 .
  • the shooting unit takes pictures of the wound electrode assembly 100, and identifies the second pole piece 2 and the first pole piece 1 in the obtained image, so as to determine the relative positional relationship between the second pole piece 2 and the first pole piece 1 .
  • the shooting unit takes pictures of the wound electrode assembly 100, and identifies the second pole piece 2 and the first pole piece 1 in the obtained image, so as to determine the relative positional relationship between the second pole piece 2 and the first pole piece 1 .
  • the shooting unit Due to the limitation of the existing shooting unit, for example, the penetrating ability of the infrared shooting unit is very limited, it is difficult to identify the second pole piece 2 and the first pole piece 1 simultaneously in the image taken with the wound rear electrode assembly 100 and determine its relative position. Therefore, it is necessary to use the images of the first pole piece 1 and the second pole piece 2 (corresponding to the first image T1 and the second image T2 respectively) to determine the positional displacement of the pole piece.
  • the image before winding needs to be used (at this time, the second pole piece 2 and the two-layer separator 3 have not yet been stacked on the first pole piece 1).
  • positional deviation easily occurs during winding. Therefore, taking a photo of the second pole piece 2 needs to use the image after winding.
  • the first pole piece 1 in the first image T1 and the second pole piece 2 in the second image T2 obtained at the same time do not have a corresponding relationship. That is, the second pole piece 2 on the second image T2 obtained at the same time enters the electrode assembly winding device (needle 5 ) earlier than the first pole piece 1 in the first image T1 .
  • the problem of how to accurately determine the relative positional offset between the second pole piece 2 and the first pole piece 1 using the imaging unit 4 arises.
  • FIG. 5 is a flowchart of an offset detection method according to an embodiment of the present application.
  • the offset detection method 200 includes: an image acquisition step 210, during the winding process of the electrode assembly 100, a plurality of first images T1 and a plurality of second images T2 are acquired by the photographing unit 4, The first pole piece 1 is included in the first image T1, and the second pole piece 2 is included in the second image T2; the image matching step 220 is to match a first image T1 with a second image T2, and a first image T1 Contains the same or corresponding identification object 6 as a second image T2, and the identification object 6 is a part periodically formed on each winding layer of the electrode assembly 100; the offset determination step 230, after a group of matched first images T1 And in the second image T2, it is determined whether the electrode assembly 100 is shifted according to the boundary of the first pole piece 1 in the first image T1 and/or the
  • the method of an embodiment defines a marking object, which is a part periodically formed on each winding layer of the electrode assembly 100 . Therefore, the first picture T1 and the second image T2 taken with respect to each layer both contain the identified object.
  • a set of images T1 , T2 of the same or corresponding identified object are matched.
  • An offset determination step 230 is performed using a set of matched images T1, T2.
  • the identification object 6 is the tab 11 of the first pole piece 1 and/or the tab 22 of the second pole piece 2 in the same winding layer. Since the tabs 11 of the first pole piece 1 and/or the tabs 22 of the second pole piece 2 are periodically formed on each winding layer of the electrode assembly, there is no need to additionally set markers on the electrode assembly 100, only through the second The tab 11 of one pole piece and/or the tab 22 of the second pole piece can match the first image T1 and the second image T2.
  • the marking object 6 is not limited to the tab 11 of the first pole piece 1 and the tab 22 of the second pole piece 2, as long as it can appear in each of the first image T1 and the second image T2 .
  • the comparison area S is set according to the identified object, according to the boundary of the first pole piece 1 in the comparison area S of the first image T1 and/or the second image T2
  • the boundary of the second pole piece 2 in the comparison area S is determined to determine whether the electrode assembly 100 is shifted.
  • the comparison region S is a region having a predetermined length in the Y direction. The prescribed length is less than the unrolled length of a wound layer.
  • the first image T1 is an image of the electrode assembly 100 before being wound on the winding needle 5
  • the second image T2 is an image of the electrode assembly 100 being wound on the winding needle 5 .
  • the first pole piece 1 is located on the outermost side along the X-axis direction, and below the first pole piece 1 are the diaphragm 3 and the second pole piece.
  • the diaphragm 3 is located on the outermost side along the X-axis direction, and below the diaphragm 3 are the second pole piece 2 , another diaphragm 3 and the first pole piece 1 .
  • the diaphragm 3 and the second pole piece 2 can be recognized. Moreover, the first pole piece 1 in the first image T1 is in the state of the electrode assembly 100 before being wound, and the second pole piece 2 in the second image T2 is in the state of the electrode assembly 100 after being wound.
  • the electrode assembly 100 Since the electrode assembly 100 is prone to deflection during the process of being wound on the needle. By comparing the second image T2 of the electrode assembly 100 after winding with the first image T1 of the state of the electrode assembly 100 before winding, it can be determined that the first pole piece 1 and the second pole piece 1 are in the winding process. Whether sheet 2 is offset.
  • the image acquisition step 210 when the winding needle 5 rotates by a preset angle ⁇ , the first image T1 and the second image T2 are acquired.
  • a first image T1 comprising the first pole piece 1 and a second image comprising the second pole piece 2 are output T2.
  • the angle of ⁇ is not limited to 360°, as long as it is ensured that each output first image T1 and second image T2 contains only one identical or corresponding identification object 6 .
  • offset determination can be performed in real time.
  • the shooting unit 4 includes a first camera 41 and a second camera 42, the first camera 41 takes a first image T1, the second camera 42 takes a second image T2, and the first camera 41 The two opposite surfaces of the electrode assembly 100 are photographed respectively by the second camera 42 .
  • the first camera 41 and the second camera 42 of the photographing unit 4 may be line scan cameras, and the second image T2 output by the second camera 42 is equivalent to the expanded view of the wound electrode assembly 100 along the Y direction.
  • the electrode assembly 100 Since the electrode assembly 100 is prone to deflection during the process of being wound on the needle. By comparing the first image T1 and the second image T2 of the two opposite surfaces of the electrode assembly 100 , it can be determined whether the first pole piece 1 and the second pole piece 2 are shifted during the winding process.
  • the (n+1)th second image T2 acquired in the image acquiring step 210 is matched with the nth first image T1.
  • a first image T1 and a second image T2 are output, and the output first image T1 and second image T2 count.
  • the preset angle ⁇ is less than or equal to 360°, it is ensured that each of the first image T2 and the first image T1 has one and only one identification object 6 .
  • the electrode assembly 100 in the output second image T2 is wound on the winding needle 5 earlier than the electrode assembly 100 in the first image T1 .
  • the object 6 is not marked in the first image of the second image T2.
  • the (n+1)th second image T2 and the nth first image T1 are electrode assemblies 100 of the same winding layer.
  • the matching principle of the first image T1 and the second image T2 depends on the placement positions of the first camera 41 and the second camera 42 in the photographing unit 4 . For example, when the distance between the first camera 41 and the second camera 42 is relatively long, it is also possible that the (n+2)th second image T2 matches the nth first image T1.
  • the first distance d1 is obtained in the first image T1
  • the second distance d2 is acquired in the second image T2
  • the first distance d1 is the distance from the first reference point A1 to the boundary of the first pole piece 1
  • the second distance is the distance from the second reference point A2 to the second pole piece 2
  • the relative positional relationship between the first pole piece 1 and the second pole piece 2 can be determined, so as to determine whether the electrode assembly 100 has a positional shift during winding.
  • the first distance d1 is obtained in the first image T1, and in the second image T2 Obtain the second distance d1, the first distance d1 is the distance from the first reference point A1 to the boundary of the first pole piece 1, the second distance d1 is the distance from the second reference point A2 to the boundary of the second pole piece 2, by comparing The first distance d1 and the first distance preset value d1_ref determine whether the first pole piece 1 of the electrode assembly 100 is offset, and the second distance of the electrode assembly 100 is determined by comparing the second distance d2 with the second distance preset value d2_ref. Whether pole piece 2 is offset.
  • first distance d1 and the second distance d2 By comparing the first distance d1 and the second distance d2 with the preset values, it can be judged whether the position of the first pole piece 1 and the second pole piece 2 has shifted.
  • the relationship between the first distance d1 and the second distance d2 can more accurately determine which pole piece is displaced.
  • first determine the relationship between the first distance d1 and the second distance d2 it is also possible to first determine the relationship between the first distance d1 and the second distance d2 to determine whether the electrode assembly 100 is displaced during winding.
  • the first distance d1 is compared with the first distance preset value d1_ref and the second distance d2 is compared with the second distance preset value d2_ref, so as to know more accurately Which pole piece is shifted in position.
  • it is determined that the electrode assembly 100 has no positional displacement during winding it is not necessary to perform the next step of displacement determination, thereby improving the efficiency of displacement determination.
  • an offset detection device is provided, wherein it is used to detect the position offset of the electrode assembly 100 when winding, the electrode assembly 100 includes a first pole piece 1 and a second pole piece 2, and the offset
  • the detection device includes: an image acquisition unit, during the winding process of the electrode assembly 100, acquires a plurality of first images T1 and a plurality of second images T2, the first image T1 includes the first pole piece 1, and the second image T2 includes Including the second pole piece 2, the image matching unit matches a first image T1 and a second image T2, a first image T1 and a second image T2 contain the same or corresponding identification object 6, and the identification object 6 is a cycle
  • the offset detection device it is possible to determine the relative positional relationship between the first pole piece 1 and the second pole piece 2 at the same position in the same winding layer, so that it is possible to more accurately determine whether the electrode assembly 100 has occurred during the winding process. position offset.
  • the present application provides an offset detection method 100, including the following steps:
  • the first image T1 and the second image T2 are obtained by the shooting unit 4, and the first image T1 includes the winding The first pole piece 1 around the front.
  • the second image T2 includes the wound second pole piece 2;
  • Image matching step 220 matching the (n+1)th second image T2 with the nth first image T2, thereby ensuring that the second pole piece 2 and The nth first image T1 is in the same winding layer of the electrode assembly 100, and the first image T1 and a second image T2 contain the same or corresponding identification object 6 (the first tab 11 and/or the second tab 22) .
  • Offset determination step 230 firstly, identify the identification object 6 in a group of matched first images T1 and second images T2, and determine the comparison area S according to the identification object 6, thereby determining the first pole piece for offset determination
  • the comparison area S of 1 and the comparison area S of the second pole piece 2 are the same area of the same winding layer of the electrode assembly 100 .
  • define the first reference point A1 and the second reference point A2 in the comparison area thus obtain the first distance d1 (the distance between the first reference point A1 and the boundary of the first pole piece 1) and the second distance d2 (the distance between the first reference point A1 and the boundary of the first pole piece 1) The distance between the second reference point A2 and the boundary of the second pole piece 2).
  • Whether the electrode assembly 100 is shifted is determined by comparing the difference between the distances of d1 and d2 with the first threshold.
  • d1 is further compared with the first distance preset value d1_ref and d2 is compared with the second distance preset value d1_ref, so as to more accurately determine which of the first pole piece 1 and the second pole piece 2 Pole piece shifted.
  • the present application is not limited to the above-mentioned embodiments.
  • the above-mentioned embodiments are merely examples, and within the scope of the technical solution of the present application, embodiments that have substantially the same configuration as the technical idea and exert the same function and effect are included in the technical scope of the present application.
  • various modifications conceivable by those skilled in the art are added to the embodiments, and other forms constructed by combining some components in the embodiments are also included in the scope of the present application. .

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  • Image Analysis (AREA)

Abstract

本申请提供一种可以用于检测电极组件卷绕时的位置偏移的偏移检测方法及偏移检测装置，该方法包括：图像获取步骤，在电极组件的卷绕过程中，通过拍摄单元获取多个第一图像和多个第二图像，第一图像中包括第一极片，第二图像中包括第二极片；图像匹配步骤，将一个第一图像和一个第二图像匹配，一个第一图像和一个第二图像包含相同或相应的标识对象，标识对象为周期性形成于电极组件的各个卷绕层的部分；偏移判定步骤，在一组匹配后的第一图像和第二图像中，根据第一图像中的第一极片的边界和/或第二图像中的第二极片的边界，判定电极组件是否发生偏移。由此，可以判定处于同一卷绕层相同位置的第一、第二极片的位置偏移，从而更准确地判定位置偏移。

Description

偏移检测方法及偏移检测装置 技术领域
本申请涉及电池制造领域，尤其涉及一种偏移检测方法及偏移检测装置，用于在卷绕制造电极组件时检测电极组件的位置偏移。
背景技术
电极组件作为电池单体中发生电化学反应的部件，一般由第一极片、第二极片和隔膜卷绕或层叠放置形成。在电极组件卷绕过程中，第一极片、第二极片和隔膜容易出现偏摆现象，使得第一极片、第二极片和隔膜偏离正常位置。而电极组件卷绕的好坏直接影响电池单体的性能。因此，如何能准确地对电极组件进行偏移检测对于电池制造至关重要。
发明内容
鉴于上述问题，本发明提供了一种偏移检测方法及偏移检测装置，可以准确地检测卷绕电极组件时的位置偏移。
第一方面，提供了一种偏移检测方法，其中，用于检测电极组件卷绕时的位置偏移，所述电极组件包括第一极片和第二极片，所述偏移检测方法包括：图像获取步骤，在所述电极组件的卷绕过程中，通过拍摄单元获取多个第一图像和多个第二图像，所述第一图像中包括所述第一极片，所述第二图像中包括所述第二极片；图像匹配步骤，将一个第一图像和一个第二图像匹配，所述一个第一图像和所述一个第二图像包含相同或相应的标识对象，所述标识对象为周期性形成于所述电极组件的各个卷绕层的部分；偏移判定步骤，在一组匹配后的第一图像和第二图像中，根据所述第一图像中的第一极片的边界和/或所述第二图像中的第二极片的边界，判定所述电极组件是否发生偏移。
本申请实施例的技术方案中，受电极组件卷绕设备的卷绕速度及拍摄单元的位置等的影响，同时获取的第一图像上的第一极片与第二图像上的第二极片可能不具有相互对应关系。即，同时获取的第二图像上的第二极片可能早于第一图像上的第一极片进入电极组件卷绕设备。本申请的实施例的技术方案通过匹配第一图像和第二图像，来确保一组匹配 的第一图像和第二图像中的第一极片和第二极片相互对应，即，一组匹配的第一图像和第二图像中的第一极片和第二极片在卷绕后的电极组件中处于同一卷绕层。从而，可以更准确地判定电极组件卷绕时的位置偏移。
在一些实施例中，在偏移判定步骤中，根据所述标识对象设定比较区域，根据该第一图像的所述比较区域中的第一极片的边界和/或该第二图像的所述比较区域中的第二极片的边界，判定所述电极组件是否发生偏移。通过图像匹配步骤可以确保判定的第一图像和第二图像为同一卷绕层的两张图像。通过标识对象确定的比较区域可以进一步确保进行偏移判定的区域为同一卷绕层中相互叠置的第一极片和第二极片的相同区域。由此，可以更准确地判定电极组件卷绕时的位置偏移。
在一些实施例中，所述第一图像为所述电极组件卷绕于卷针前的图像，所述第二图像为所述电极组件卷绕于所述卷针后的图像。在卷绕于卷针的过程中，极片容易发生偏移。通过第一图像和第二图像可以分别获得极片卷绕前的状态和卷绕后的状态，从而判定在卷绕过程中电极组件是否发生位置偏移。
在一些实施例中，在所述图像获取步骤中，所述卷针旋转预设角度时，获取所述第一图像和所述第二图像。通过设置预设角度，可以确保输出的每一张第一图像和第二图像中仅包含一个标识对象，从而确保在第一图像和第二图像中可以利用标识对象确定比较区域。此外，由于在旋转的同时获取图像，因此可以实时地进行偏移判定。
在一些实施例中，所述拍摄单元包括第一相机和第二相机，所述第一相机拍摄所述第一图像，所述第二相机拍摄所述第二图像，所述第一相机和所述第二相机分别拍摄所述电极组件的相反的两个面。由于在卷绕于卷针过程中，电极组件100容易发生偏移。通过将电极组件100的相反的两个面的第一图像T1和第二图像T2对比，可以判定在卷绕于卷针的过程中第一极片1和第二极片2是否发生偏移。
在一些实施例中，所述图像匹配步骤中，将在所述图像获取步骤中获取的第(n+1)张第二图像和所述第n张第一图像匹配。受电极组件卷绕设备的卷绕速度及拍摄单元等的位置的影响，同时获取的第二图像中的电极组件早于第一图像中的第一电极组件，且第二图像T2的第1张图 中没有标识对象。通过将第(n+1)张第二图像和所述第n张第一图像匹配，可以确保一组匹配的的第二图像和第一图像中的电极组件相互对应，即，一组匹配的第一图像和第二图像中的第一极片和第二极片在卷绕后的电极组件中处于同一卷绕层，从而可以更准确地判定电极组件卷绕时的位置偏移。
在一些实施例中，所述标识对象为同一卷绕层中的所述第一极片的极耳和/或所述第二极片的极耳。由于第一极片的极耳和/或第二极片的极耳周期性形成于电极组件各个卷绕层的部分，因此无需另外在电极组件上设置标识物，仅通过第一极片的极耳和/或第二极片的极耳，就可以在第一图像和第二图像中确定比较区域。
在一些实施例中，在所述偏移判定步骤中，在一组匹配的第一图像和第二图像中，在所述第一图像中获取第一距离，在所述第二图像中获取第二距离，所述第一距离为第一基准点到所述第一极片的边界的距离，所述第二距离为第二基准点到所述第二极片的边界的距离，当所述第一距离和所述第二距离之差减去所述第一极片的边界和所述第二极片的边界的预设距离而取得的差值大于第一阈值时，判定所述电极组件发生偏移。由此，通过比较第一距离和第二距离，可以判定第一极片和第二极片的相对位置关系，从而判定电极组件在卷绕时是否发生位置偏移。
在一些实施例中，在所述偏移判定步骤中，在一组匹配的第一图像和第二图像中，在所述第一图像中获取第一距离，在所述第二图像中获取第二距离，所述第一距离为第一基准点到所述第一极片的边界的距离，所述第二距离为第二基准点到所述第二极片的边界的距离，通过比较所述第一距离和第一距离预设值，判定所述电极组件的第一极片是否发生偏移，通过比较所述第二距离和第二距离预设值，判定所述电极组件的第二极片是否发生偏移。由此，通过分别将第一、第二距离与预设值比较，可以分别判定第一极片和第二极片是否发生位置偏移，相比于判定第一距离和第二距离之间的关系，可以更精确的判定哪个极片发生位置偏移。
第二方面，提供一种偏移检测装置，其中，用于检测电极组件卷绕时的位置偏移，所述电极组件包括第一极片和第二极片，所述偏移检测装置包括：图像获取单元，在所述电极组件的卷绕过程中，获取多个第 一图像和多个第二图像，所述第一图像中包括所述第一极片，所述第二图像中包括所述第二极片，图像匹配单元，将一个第一图像和一个第二图像匹配，所述一个第一图像和所述一个第二图像包含相同或相应的标识对象，所述标识对象为周期性形成于所述电极组件的各个卷绕层的部分，偏移判定单元，针对一组匹配的第一图像和第二图像，根据该第一图像中的第一极片的边界和/或该第二图像中的第二极片的边界，判定所述电极组件是否发生偏移。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1是包含本申请一实施例的电极组件制造设备的示意图。
图2是本申请一实施例的卷绕后的电极组件的示意图。
图3是包含本申请一实施例的卷绕后的电极组件的X-Y截面的截面图。
图4是展开的本申请一实施例的电极组件的示意图。
图5是本申请一实施例的偏移检测方法的流程图。
图6是本申请一实施方式的一组匹配的第一图像和第二图像的示意图。
附图标记说明：
100 电极组件
1 第一极片
11 第一极耳
2 第二极片
22 第二极耳
3 隔膜
4 拍摄单元
41 第一相机
42 第二相机
5 卷针
6 标识对象
α 预设角度
T1 第一图像
T2 第二图像
S 比较区域
A1 第一基准点
A2 第二基准点
d1 第一距离
d2 第二距离
200 偏移检测方法
210 图像获取步骤
220 图像匹配步骤
230 偏移判定步骤
具体实施例
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本申请中在申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本申请所描述的实施例可以与其它实施例相结合。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语 “安装”、“相连”、“连接”、“附接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
本申请中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本申请中字符“/”，一般表示前后关联对象是一种“或”的关系。
本申请中出现的“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
图1是包含本申请一实施例的电极组件制造设备的示意图。图2示出通过卷绕形成的电极组件100。如图1所述，电极组件制造装置包括输送装置和卷绕装置(卷针5)。通过输送装置，将带状的第一极片1、第二极片2和隔膜3输送至卷绕装置(卷针5)，第一极片1、隔膜3、第二极片2以及隔膜3依次叠置卷绕于卷绕装置(卷针5)并成型出电极组件100(参照图2)。图1中的卷针5仅为示意，按照电池单体的类型及电池壳体的形状，电极组件可以卷绕成截面为圆柱形的电极组件、或椭圆形的电极组件(如图2、图3所示)。
卷针5每旋转一周(360°)，电极组件100增加一层。如图2所示，随着卷针5的旋转，电极组件100在X方向上的厚度逐渐增加。此外，带状第一极片1、第二极片2和隔膜3的宽度决定了电极组件100在Z轴方向上的高度。图3是图2所示的电极组件100在X-Y平面上的截面图。如图3所示，对于每一卷绕层，沿X方向从外到内，依次为隔膜3、第二极片2、隔膜3以及第一极片1。由此，对于每一卷绕层，隔膜3隔开第二极片2和第一极片1。
在卷绕电极组件过程中较为重要的参数为卷绕后电极组件100在Z轴方向上的对齐度。具体而言，卷绕后的电极组件100在Z轴方向上的对齐度是第二极片2与第一极片1在Z轴方向上的相对位置。图4是叠置卷绕后的电极组件100沿Y方向的展开图。如图所示，在Z轴方向上(即，展开的电极组件100的宽度方向)，从外向内依次应为：隔膜3、第二极片2、另一隔膜3以及第一极片1。即，在Z轴方向上，隔膜3位于最外侧，而第一极片1 位于最内侧，并且第二极片2超出第一极片1规定距离。由于在卷绕电极组件100的过程中，第二极片2、第一极片1容易出现偏摆现象，使得第二极片2和第一极片1的相对位置发生偏移，从而影响制造的电池单体的质量和性能。因此，为了监测第二极片2和第一极片1的相对位置偏移情况，电极组件制造装置还包括拍摄单元4。
理想情况为拍摄单元拍摄卷绕后的电极组件100，并在获得的图像中识别第二极片2和第一极片1，以判定第二极片2和第一极片1的相对位置关系。但如上所述，对于电极组件的每一卷绕层，为拍摄第一极片1，需透过隔膜3、第二极片2以及位于第二极片2和第一极片1之间的另一隔膜3。由于现有拍摄单元的局限性，例如，红外线拍摄单元的穿透能力十分有限，很难在拍摄有卷绕后电极组件100的图像中，同时识别第二极片2和第一极片1并判定其相对位置关系。因此，需要利用分别拍摄有第一极片1和第二极片2的图像(分别对应于第一图像T1和第二图像T2)进行极片位置偏移判定。
为拍摄第一极片1需利用卷绕前的图像(此时，第二极片2、2层隔膜3尚未叠置在第一极片1上)。此外，如上所述，位置偏移容易发生在卷绕过程中。因此，拍摄有第二极片2的照片需利用卷绕后的图像。而同时获得的第一图像T1中的第一极片1和第二图像T2中的第二极片2不具有相互对应关系。即，同时获得的第二图像T2上的第二极片2早于第一图像T1中的第一极片1进入电极组件卷绕设备(卷针5)。由此，产生如何利用拍摄单元4准确地判定第二极片2和第一极片1之间的相对位置偏移的问题。
基于以上考虑，发明人经过深入研究，提出了一种偏移检测方法。图5是本申请的一实施例的偏移检测方法的流程图。如图5所示，该偏移检测方法200包括：图像获取步骤210，在所述电极组件100的卷绕过程中，通过拍摄单元4获取多个第一图像T1和多个第二图像T2，第一图像T1中包括所述第一极片1，第二图像T2中包括第二极片2；图像匹配步骤220，将一个第一图像T1和一个第二图像T2匹配，一个第一图像T1和一个第二图像T2包含相同或相应的标识对象6，标识对象6为周期性形成于电极组件100的各个卷绕层的部分；偏移判定步骤230，在一组匹配后的第一图像T1和第二图像T2中，根据第一图像T1中的第一极片 1的边界和/或第二图像T2中的第二极片2的边界，判定电极组件100是否发生偏移。
为了利用第一图像T1和第二图像T2，对比在卷绕后的电极组件100中处于同一卷绕层的相同位置的第二极片2和第一极片1的相对位置，在本申请的一实施例的方法定义了标识对象，该标识对象为周期性形成于所述电极组件100的各个卷绕层的部分。由此，相对于每一层拍摄的第一图片T1和第二图像T2均含有该标识对象。
通过识别标识对象，将拍摄相同或相应的标识对象的一组图像T1、T2匹配。利用一组匹配的图像T1、T2进行偏移判定步骤230。由此，确保了在偏移判定步骤230中判定的是处于卷绕的电极组件100同一卷绕层相同位置的第一极片1和第二极片2，从而可以准确地判定电极组件100的位置偏移。
根据本申请的一些实施例，如图6所示，标识对象6为同一卷绕层中的第一极片1的极耳11和/或所述第二极片2的极耳22。由于第一极片1的极耳11和/或第二极片2的极耳22周期性形成于电极组件各个卷绕层的部分，因此无需另外在电极组件100上设置标识物，仅通过第一极片的极耳11和/或第二极片的极耳22，就可以匹配第一图像T1和第二图像T2。此外，标识对象6也不局限于第一极片1的极耳11、所述第二极片2的极耳22，只要其能出现于每一张第一图像T1、第二图像T2即可。
根据本申请的一些实施例，在偏移判定步骤中，根据标识对象设定比较区域S，根据第一图像T1的比较区域S中的第一极片1的边界和/或该第二图像T2的比较区域S中的第二极片2的边界，判定电极组件100是否发生偏移。
如图6所示，在Y方向上，第一图像T1上的比较区域S距标识对象6的距离等于第二图像T2上的比较区域S距相同或相应标识对象6的距离。由此，只要确保第一图像T1上的标识对象6和第二图像T2上的标识对象6相互对应，就可以确保第一图像T1上的比较区域S和第二图像T2上的比较区域S在为同一卷绕层中相互叠置的第一极片1和第二极片2的相同区域。由此，可以更准确地判定电极组件卷绕时的位置偏移。此外，比较区域S为在Y方向上具有规定长度的一段区域。该规定长度小 于一卷绕层的展开的长度。通过在该规定长度上判定第一极片1和第二极片2的相对位置偏移，而不在整个展开长度上判定位置偏移，可以提高偏移判定速率。
根据本申请的一些实施例，第一图像T1为电极组件100卷绕于卷针5前的图像，第二图像T2为电极组件100卷绕于卷针5后的图像。
如图6所示，在拍摄有卷绕前电极组件100的第一图像T1中，第一极片1沿X轴方向位于最外侧，第一极片1的下方依次为隔膜3、第二极片2以及另一隔膜3。取决于拍摄单元4的穿透能力，在第一图像T1中，可以识别第一极片1和隔膜3。在拍摄有卷绕后电极组件100的第二图像T2中，隔膜3沿X轴方向位于最外侧，隔膜3的下方的依次为第二极片2、另一隔膜3以及第一极片1。取决于拍摄单元4的穿透能力，在第二图像T2中，可以识别隔膜3和第二极片2。并且，第一图像T1中的第一极片1为卷绕前电极组件100的状态，而第二图像T2中的第二极片2为卷绕后电极组件100的状态。
由于在卷绕于卷针的过程中，电极组件100容易发生偏移。通过将拍有卷绕后的电极组件100的第二图像T2与拍摄有卷绕前电极组件100的状态的第一图像T1对比，可以判定在卷绕过程中第一极片1和第二极片2是否发生偏移。
根据本申请的一些实施例，在图像获取步骤210中，卷针5旋转预设角度α时，获取第一图像T1和第二图像T2。
参照图1，卷针5每旋转预设角度α(例如，α＝360°)时，输出一张包含第一极片1的第一图像T1和一张包含第二极片2的第二图像T2。α的角度不限于360°，只要保证输出的每张第一图像T1和第二图像T2上仅包含一个相同或相应的标识对象6即可。此外，由于在旋转的同时获取图像，可以实时地进行偏移判定。
根据本申请的一些实施例，参照图1，拍摄单元4包括第一相机41和第二相机42，第一相机41拍摄第一图像T1，第二相机42拍摄第二图像T2，第一相机41和第二相机42分别拍摄电极组件100的相反的两个面。
拍摄单元4的第一相机41和第二相机42可以为线扫相机，则第二相机42输出的第二图像T2相当于卷绕后电极组件100沿Y方向的展开 图。
由于在卷绕于卷针的过程中，电极组件100容易发生偏移。通过将电极组件100的相反的两个面的第一图像T1和第二图像T2对比，可以判定在卷绕过程中第一极片1和第二极片2是否发生偏移。
根据本申请的一些实施例，所述图像匹配220步骤中，将在图像获取步骤210中获取的第(n+1)张第二图像T2和第n张第一图像T1匹配。
如上所述，卷针5每旋转预设角度α(例如，α＝360°)时，输出一张第一图像T1和一张第二图像T2，并且对输出的第一图像T1和第二图像T2计数。通过将预设角度α设置为小于等于360°，确保了每个第一图像T2和第一图像T1有且仅有一个标识对象6。此外，参照图1，输出的第二图像T2中的电极组件100早于第一图像T1中的电极组件100卷绕于卷针5。并且，第二图像T2的第1张图中没有标识对象6。因此，第(n+1)张第二图像T2和第n张第一图像T1为同一卷绕层的电极组件100。此外，应理解的是，第一图像T1和第二图像T2的匹配原则取决于拍摄单元4中第一相机41和第二相机42的放置位置。例如，当第一相机41和第二相机42距离较远时，也可能是第(n+2)张第二图像T2和第n张第一图像T1匹配。
根据本申请的一些实施例，在偏移判定步骤230中，如图6所示，在一组匹配的第一图像T1和第二图像T2中，在第一图像T1中获取第一距离d1，在所述第二图像T2中获取第二距离d2，第一距离d1为第一基准点A1到第一极片1的边界的距离，第二距离为第二基准点A2到第二极片2的边界的距离，当第一距离d1和第二距离d2之差减去第一极片1的边界和第二极片2的边界的预设距离而取得的差值大于第一阈值时，判定电极组件100发生偏移。
对于第一基准点A1和第二基准点A2的选择没有限制，只要由第一基准点A1确定的第一距离d1和由第二基准点A2确定的第二距离d2存在固定的对应关系即可。Z由此，通过比较第一距离d1和第二距离d2，可以判定第一极片1和第二极片2的相对位置关系，从而判定电极组件100在卷绕时是否发生位置偏移。
根据本申请的一些实施例，在偏移判定步骤中230，在一组匹配的第一图像T1和第二图像T2中，在第一图像T1中获取第一距离d1，在第 二图像T2中获取第二距离d1，第一距离d1为第一基准点A1到第一极片1的边界的距离，第二距离d1为第二基准点A2到第二极片2的边界的距离，通过比较第一距离d1和第一距离预设值d1_ref，判定电极组件100的第一极片1是否发生偏移，通过比较第二距离d2和第二距离预设值d2_ref，判定电极组件100的第二极片2是否发生偏移。
通过分别将第一距离d1、第二距离d2与预设值比较，可以分别判定第一极片1和第二极片2是否发生位置偏移，当确定发生位置偏移时，相比于判定第一距离d1和第二距离d2之间的关系，可以更精确的判定哪个极片发生位置偏移。
也可以，先判定第一距离d1和第二距离d2之间的关系，确定电极组件100在卷绕时是否发生位置偏移。当确定电极组件100在卷绕时发生位置偏移时，再进行第一距离d1和第一距离预设值d1_ref以及第二距离d2和第二距离预设值d2_ref的比较，从而更准确地获知哪个极片发生位置偏移。当确定电极组件100在卷绕时未发生位置偏移时，则无需进行下一步的偏移判定，由此，可以提高偏移判定效率。
根据本申请的一些实施例，提供一种偏移检测装置，其中，用于检测电极组件100卷绕时的位置偏移，电极组件100包括第一极片1和第二极片2，偏移检测装置包括：图像获取单元，在电极组件100的卷绕过程中，获取多个第一图像T1和多个第二图像T2，第一图像T1中包括第一极片1，第二图像T2中包括第二极片2，图像匹配单元，将一个第一图像T1和一个第二图像T2匹配，一个第一图像T1和一个第二图像T2包含相同或相应的标识对象6，标识对象6为周期性形成于所述电极组件100的各个卷绕层的部分，偏移判定单元，针对一组匹配的第一图像T1和第二图像T2，根据该第一图像中的第一极片的边界和/或该第二图像中的第二极片的边界，判定电极组件100是否发生偏移。通过偏移检测装置，可以判定同一卷绕层中相同位置的第一极片1和第二极片2之间的相对位置关系，从而可以更准确的判定卷绕过程中的电极组件100是否发生位置偏移。
根据本申请的一些实施例，参见图1至图6，本申请提供了一种偏移检测方法100，包括以下步骤：
图像获取步骤210，在所述电极组件100的卷绕过程中，卷针5每旋 转预设角度α时，通过拍摄单元4获取第一图像T1和第二图像T2，第一图像T1中包括卷绕前的第一极片1。第二图像T2中包括卷绕后的第二极片2；
图像匹配步骤220，将第(n+1)张第二图像T2和第n张第一图像T2匹配，由此，确保第(n+1)张第二图像T2上的第二极片2和第n张第一图像T1处于电极组件100的同一卷绕层，第一图像T1和一个第二图像T2包含相同或相应的标识对象6(第一极耳11和/或第二极耳22)。
偏移判定步骤230，首先，在一组匹配的第一图像T1和第二图像T2中识别标识对象6，并且根据标识对象6确定比较区域S，由此确定进行偏移判定的第一极片1的比较区域S和第二极片2的比较区域S为电极组件100的同一卷绕层的相同区域。然后，在比较区域内定义第一基准点A1和第二基准点A2，由此得到第一距离d1(第一基准点A1与第一极片1的边界的距离)和第二距离d2(第二基准点A2与第二极片2的边界的距离)。通过将d1和d2的距离之差与第一阈值进行比较，来判定电极组件100是否发生偏移。当判定电极组件100发生偏移时，进一步比较d1和第一距离预设值d1_ref以及d2和第二距离预设值d1_ref，从而更准确的判定第一极片1和第二极片2中哪个极片发生偏移。
最后，需要说明的是，本申请不限定于上述实施例。上述实施例仅为例示，在本申请的技术方案范围内具有与技术思想实质相同的构成、发挥相同作用效果的实施例均包含在本申请的技术范围内。此外，在不脱离本申请主旨的范围内，对实施例施加本领域技术人员能够想到的各种变形、将实施例中的一部分构成要素加以组合而构筑的其它方式也包含在本申请的范围内。

Claims (10)

  1. 一种偏移检测方法，其中，
    用于检测电极组件卷绕时的位置偏移，所述电极组件包括第一极片和第二极片，
    所述偏移检测方法包括：
    图像获取步骤，在所述电极组件的卷绕过程中，通过拍摄单元获取多个第一图像和多个第二图像，所述第一图像中包括所述第一极片，所述第二图像中包括所述第二极片，
    图像匹配步骤，将一个第一图像和一个第二图像匹配，所述一个第一图像和所述一个第二图像包含相同或相应的标识对象，所述标识对象为周期性形成于所述电极组件的各个卷绕层的部分，
    偏移判定步骤，在一组匹配的第一图像和第二图像中，根据所述第一图像中的第一极片的边界和/或所述第二图像中的第二极片的边界，判定所述电极组件是否发生偏移。
  2. 根据权利要求1所述的方法，其中，
    在偏移判定步骤中，根据所述标识对象设定比较区域，根据所述第一图像的所述比较区域中的第一极片的边界和/或所述第二图像的所述比较区域中的第二极片的边界，判定所述电极组件是否发生偏移。
  3. 根据权利要求1或2所述的方法，其中，
    所述第一图像为所述电极组件卷绕于卷针前的图像，所述第二图像为所述电极组件卷绕于所述卷针后的图像。
  4. 根据权利要求3所述的方法，其中，
    在所述图像获取步骤中，所述卷针旋转预设角度时，获取所述第一图像和所述第二图像。
  5. 根据权利要求1～4中任一项所述的方法，其中，
    所述拍摄单元包括第一相机和第二相机，
    所述第一相机拍摄所述第一图像，所述第二相机拍摄所述第二图像，
    所述第一相机和所述第二相机分别拍摄所述电极组件的相反的两个面。
  6. 根据权利要求1～5中任一项所述的方法，其中，
    所述图像匹配步骤中，将在所述图像获取步骤中获取的第(n+1)张第二图像和所述第n张第一图像匹配。
  7. 根据权利要求1～6中任一项所述的方法，其中，
    所述标识对象为同一卷绕层中的所述第一极片的极耳和/或所述第二极片的极耳。
  8. 根据权利要求1～7中任一项所述的方法，其中，
    在所述偏移判定步骤中，
    在一组匹配的第一图像和第二图像中，在所述第一图像中获取第一距离，在所述第二图像中获取第二距离，所述第一距离为第一基准点到所述第一极片的边界的距离，所述第二距离为第二基准点到所述第二极片的边界的距离，
    当所述第一距离和所述第二距离之差减去所述第一极片的边界和所述第二极片的边界的预设距离而取得的差值大于第一阈值时，判定所述电极组件发生偏移。
  9. 根据权利要求1～7中任一项所述的方法，其中，
    在所述偏移判定步骤中，
    在一组匹配的第一图像和第二图像中，在所述第一图像中获取第一距离，在所述第二图像中获取第二距离，所述第一距离为第一基准点到所述第一极片的边界的距离，所述第二距离为第二基准点到所述第二极片的边界的距离，
    通过比较所述第一距离和第一距离预设值，判定所述电极组件的第一极片是否发生偏移，
    通过比较所述第二距离和第二距离预设值，判定所述电极组件的第二极片是否发生偏移。
  10. 一种偏移检测装置，其中，
    用于检测电极组件卷绕时的位置偏移，所述电极组件包括第一极片和第二极片，
    所述偏移检测装置包括：
    图像获取单元，在所述电极组件的卷绕过程中，获取多个第一图像和多个第二图像，所述第一图像中包括所述第一极片，所述第二图像中包括所述第二极片，
    图像匹配单元，将一个第一图像和一个第二图像匹配，所述一个第一图像和所述一个第二图像包含相同或相应的标识对象，所述标识对象为周期性形成于所述电极组件的各个卷绕层的部分，
    偏移判定单元，针对一组匹配的第一图像和第二图像，根据所述第一图像中的第一极片的边界和/或所述第二图像中的第二极片的边界，判定所述电极组件是否发生偏移。
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